text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   *  qla_target.c SCSI LLD infrastructure for QLogic 22xx/23xx/24xx/25xx
   *
   *  based on qla2x00t.c code:
   *
   *  Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <vst@vlnb.net>
   *  Copyright (C) 2004 - 2005 Leonid Stoljar
   *  Copyright (C) 2006 Nathaniel Clark <nate@misrule.us>
   *  Copyright (C) 2006 - 2010 ID7 Ltd.
   *
   *  Forward port and refactoring to modern qla2xxx and target/configfs
   *
   *  Copyright (C) 2010-2013 Nicholas A. Bellinger <nab@kernel.org>
   */
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/blkdev.h>
  #include <linux/interrupt.h>
  #include <linux/pci.h>
  #include <linux/delay.h>
  #include <linux/list.h>
  #include <linux/workqueue.h>
  #include <asm/unaligned.h>
  #include <scsi/scsi.h>
  #include <scsi/scsi_host.h>
  #include <scsi/scsi_tcq.h>
  #include <target/target_core_base.h>
  #include <target/target_core_fabric.h>
  
  #include "qla_def.h"
  #include "qla_target.h"
  
  static int ql2xtgt_tape_enable;
  module_param(ql2xtgt_tape_enable, int, S_IRUGO|S_IWUSR);
  MODULE_PARM_DESC(ql2xtgt_tape_enable,
  		"Enables Sequence level error recovery (aka FC Tape). Default is 0 - no SLER. 1 - Enable SLER.");
  
  static char *qlini_mode = QLA2XXX_INI_MODE_STR_ENABLED;
  module_param(qlini_mode, charp, S_IRUGO);
  MODULE_PARM_DESC(qlini_mode,
  	"Determines when initiator mode will be enabled. Possible values: "
  	"\"exclusive\" - initiator mode will be enabled on load, "
  	"disabled on enabling target mode and then on disabling target mode "
  	"enabled back; "
  	"\"disabled\" - initiator mode will never be enabled; "
  	"\"dual\" - Initiator Modes will be enabled. Target Mode can be activated "
  	"when ready "
  	"\"enabled\" (default) - initiator mode will always stay enabled.");
  
  static int ql_dm_tgt_ex_pct = 0;
  module_param(ql_dm_tgt_ex_pct, int, S_IRUGO|S_IWUSR);
  MODULE_PARM_DESC(ql_dm_tgt_ex_pct,
  	"For Dual Mode (qlini_mode=dual), this parameter determines "
  	"the percentage of exchanges/cmds FW will allocate resources "
  	"for Target mode.");
  
  int ql2xuctrlirq = 1;
  module_param(ql2xuctrlirq, int, 0644);
  MODULE_PARM_DESC(ql2xuctrlirq,
      "User to control IRQ placement via smp_affinity."
      "Valid with qlini_mode=disabled."
      "1(default): enable");
  
  int ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
  
  static int qla_sam_status = SAM_STAT_BUSY;
  static int tc_sam_status = SAM_STAT_TASK_SET_FULL; /* target core */
  
  /*
   * From scsi/fc/fc_fcp.h
   */
  enum fcp_resp_rsp_codes {
  	FCP_TMF_CMPL = 0,
  	FCP_DATA_LEN_INVALID = 1,
  	FCP_CMND_FIELDS_INVALID = 2,
  	FCP_DATA_PARAM_MISMATCH = 3,
  	FCP_TMF_REJECTED = 4,
  	FCP_TMF_FAILED = 5,
  	FCP_TMF_INVALID_LUN = 9,
  };
  
  /*
   * fc_pri_ta from scsi/fc/fc_fcp.h
   */
  #define FCP_PTA_SIMPLE      0   /* simple task attribute */
  #define FCP_PTA_HEADQ       1   /* head of queue task attribute */
  #define FCP_PTA_ORDERED     2   /* ordered task attribute */
  #define FCP_PTA_ACA         4   /* auto. contingent allegiance */
  #define FCP_PTA_MASK        7   /* mask for task attribute field */
  #define FCP_PRI_SHIFT       3   /* priority field starts in bit 3 */
  #define FCP_PRI_RESVD_MASK  0x80        /* reserved bits in priority field */
  
  /*
   * This driver calls qla2x00_alloc_iocbs() and qla2x00_issue_marker(), which
   * must be called under HW lock and could unlock/lock it inside.
   * It isn't an issue, since in the current implementation on the time when
   * those functions are called:
   *
   *   - Either context is IRQ and only IRQ handler can modify HW data,
   *     including rings related fields,
   *
   *   - Or access to target mode variables from struct qla_tgt doesn't
   *     cross those functions boundaries, except tgt_stop, which
   *     additionally protected by irq_cmd_count.
   */
  /* Predefs for callbacks handed to qla2xxx LLD */
  static void qlt_24xx_atio_pkt(struct scsi_qla_host *ha,
  	struct atio_from_isp *pkt, uint8_t);
  static void qlt_response_pkt(struct scsi_qla_host *ha, struct rsp_que *rsp,
  	response_t *pkt);
  static int qlt_issue_task_mgmt(struct fc_port *sess, u64 lun,
  	int fn, void *iocb, int flags);
  static void qlt_send_term_exchange(struct qla_qpair *, struct qla_tgt_cmd
  	*cmd, struct atio_from_isp *atio, int ha_locked, int ul_abort);
  static void qlt_alloc_qfull_cmd(struct scsi_qla_host *vha,
  	struct atio_from_isp *atio, uint16_t status, int qfull);
  static void qlt_disable_vha(struct scsi_qla_host *vha);
  static void qlt_clear_tgt_db(struct qla_tgt *tgt);
  static void qlt_send_notify_ack(struct qla_qpair *qpair,
  	struct imm_ntfy_from_isp *ntfy,
  	uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
  	uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan);
  static void qlt_send_term_imm_notif(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *imm, int ha_locked);
  static struct fc_port *qlt_create_sess(struct scsi_qla_host *vha,
  	fc_port_t *fcport, bool local);
  void qlt_unreg_sess(struct fc_port *sess);
  static void qlt_24xx_handle_abts(struct scsi_qla_host *,
  	struct abts_recv_from_24xx *);
  static void qlt_send_busy(struct qla_qpair *, struct atio_from_isp *,
      uint16_t);
  static int qlt_check_reserve_free_req(struct qla_qpair *qpair, uint32_t);
  static inline uint32_t qlt_make_handle(struct qla_qpair *);
  
  /*
   * Global Variables
   */
  static struct kmem_cache *qla_tgt_mgmt_cmd_cachep;
  struct kmem_cache *qla_tgt_plogi_cachep;
  static mempool_t *qla_tgt_mgmt_cmd_mempool;
  static struct workqueue_struct *qla_tgt_wq;
  static DEFINE_MUTEX(qla_tgt_mutex);
  static LIST_HEAD(qla_tgt_glist);
  
  static const char *prot_op_str(u32 prot_op)
  {
  	switch (prot_op) {
  	case TARGET_PROT_NORMAL:	return "NORMAL";
  	case TARGET_PROT_DIN_INSERT:	return "DIN_INSERT";
  	case TARGET_PROT_DOUT_INSERT:	return "DOUT_INSERT";
  	case TARGET_PROT_DIN_STRIP:	return "DIN_STRIP";
  	case TARGET_PROT_DOUT_STRIP:	return "DOUT_STRIP";
  	case TARGET_PROT_DIN_PASS:	return "DIN_PASS";
  	case TARGET_PROT_DOUT_PASS:	return "DOUT_PASS";
  	default:			return "UNKNOWN";
  	}
  }
  
  /* This API intentionally takes dest as a parameter, rather than returning
   * int value to avoid caller forgetting to issue wmb() after the store */
  void qlt_do_generation_tick(struct scsi_qla_host *vha, int *dest)
  {
  	scsi_qla_host_t *base_vha = pci_get_drvdata(vha->hw->pdev);
  	*dest = atomic_inc_return(&base_vha->generation_tick);
  	/* memory barrier */
  	wmb();
  }
  
  /* Might release hw lock, then reaquire!! */
  static inline int qlt_issue_marker(struct scsi_qla_host *vha, int vha_locked)
  {
  	/* Send marker if required */
  	if (unlikely(vha->marker_needed != 0)) {
  		int rc = qla2x00_issue_marker(vha, vha_locked);
  
  		if (rc != QLA_SUCCESS) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe03d,
  			    "qla_target(%d): issue_marker() failed\n",
  			    vha->vp_idx);
  		}
  		return rc;
  	}
  	return QLA_SUCCESS;
  }
  
  static inline
  struct scsi_qla_host *qlt_find_host_by_d_id(struct scsi_qla_host *vha,
  					    be_id_t d_id)
  {
  	struct scsi_qla_host *host;
  	uint32_t key;
  
  	if (vha->d_id.b.area == d_id.area &&
  	    vha->d_id.b.domain == d_id.domain &&
  	    vha->d_id.b.al_pa == d_id.al_pa)
  		return vha;
  
  	key = be_to_port_id(d_id).b24;
  
  	host = btree_lookup32(&vha->hw->tgt.host_map, key);
  	if (!host)
  		ql_dbg(ql_dbg_tgt_mgt + ql_dbg_verbose, vha, 0xf005,
  		    "Unable to find host %06x\n", key);
  
  	return host;
  }
  
  static inline
  struct scsi_qla_host *qlt_find_host_by_vp_idx(struct scsi_qla_host *vha,
  	uint16_t vp_idx)
  {
  	struct qla_hw_data *ha = vha->hw;
  
  	if (vha->vp_idx == vp_idx)
  		return vha;
  
  	BUG_ON(ha->tgt.tgt_vp_map == NULL);
  	if (likely(test_bit(vp_idx, ha->vp_idx_map)))
  		return ha->tgt.tgt_vp_map[vp_idx].vha;
  
  	return NULL;
  }
  
  static inline void qlt_incr_num_pend_cmds(struct scsi_qla_host *vha)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
  
  	vha->hw->tgt.num_pend_cmds++;
  	if (vha->hw->tgt.num_pend_cmds > vha->qla_stats.stat_max_pend_cmds)
  		vha->qla_stats.stat_max_pend_cmds =
  			vha->hw->tgt.num_pend_cmds;
  	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  }
  static inline void qlt_decr_num_pend_cmds(struct scsi_qla_host *vha)
  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
  	vha->hw->tgt.num_pend_cmds--;
  	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  }
  
  
  static void qlt_queue_unknown_atio(scsi_qla_host_t *vha,
  	struct atio_from_isp *atio, uint8_t ha_locked)
  {
  	struct qla_tgt_sess_op *u;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	unsigned long flags;
  
  	if (tgt->tgt_stop) {
  		ql_dbg(ql_dbg_async, vha, 0x502c,
  		    "qla_target(%d): dropping unknown ATIO_TYPE7, because tgt is being stopped",
  		    vha->vp_idx);
  		goto out_term;
  	}
  
  	u = kzalloc(sizeof(*u), GFP_ATOMIC);
  	if (u == NULL)
  		goto out_term;
  
  	u->vha = vha;
  	memcpy(&u->atio, atio, sizeof(*atio));
  	INIT_LIST_HEAD(&u->cmd_list);
  
  	spin_lock_irqsave(&vha->cmd_list_lock, flags);
  	list_add_tail(&u->cmd_list, &vha->unknown_atio_list);
  	spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  
  	schedule_delayed_work(&vha->unknown_atio_work, 1);
  
  out:
  	return;
  
  out_term:
  	qlt_send_term_exchange(vha->hw->base_qpair, NULL, atio, ha_locked, 0);
  	goto out;
  }
  
  static void qlt_try_to_dequeue_unknown_atios(struct scsi_qla_host *vha,
  	uint8_t ha_locked)
  {
  	struct qla_tgt_sess_op *u, *t;
  	scsi_qla_host_t *host;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	unsigned long flags;
  	uint8_t queued = 0;
  
  	list_for_each_entry_safe(u, t, &vha->unknown_atio_list, cmd_list) {
  		if (u->aborted) {
  			ql_dbg(ql_dbg_async, vha, 0x502e,
  			    "Freeing unknown %s %p, because of Abort\n",
  			    "ATIO_TYPE7", u);
  			qlt_send_term_exchange(vha->hw->base_qpair, NULL,
  			    &u->atio, ha_locked, 0);
  			goto abort;
  		}
  
  		host = qlt_find_host_by_d_id(vha, u->atio.u.isp24.fcp_hdr.d_id);
  		if (host != NULL) {
  			ql_dbg(ql_dbg_async + ql_dbg_verbose, vha, 0x502f,
  			    "Requeuing unknown ATIO_TYPE7 %p\n", u);
  			qlt_24xx_atio_pkt(host, &u->atio, ha_locked);
  		} else if (tgt->tgt_stop) {
  			ql_dbg(ql_dbg_async + ql_dbg_verbose, vha, 0x503a,
  			    "Freeing unknown %s %p, because tgt is being stopped\n",
  			    "ATIO_TYPE7", u);
  			qlt_send_term_exchange(vha->hw->base_qpair, NULL,
  			    &u->atio, ha_locked, 0);
  		} else {
  			ql_dbg(ql_dbg_async + ql_dbg_verbose, vha, 0x503d,
  			    "Reschedule u %p, vha %p, host %p\n", u, vha, host);
  			if (!queued) {
  				queued = 1;
  				schedule_delayed_work(&vha->unknown_atio_work,
  				    1);
  			}
  			continue;
  		}
  
  abort:
  		spin_lock_irqsave(&vha->cmd_list_lock, flags);
  		list_del(&u->cmd_list);
  		spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  		kfree(u);
  	}
  }
  
  void qlt_unknown_atio_work_fn(struct work_struct *work)
  {
  	struct scsi_qla_host *vha = container_of(to_delayed_work(work),
  	    struct scsi_qla_host, unknown_atio_work);
  
  	qlt_try_to_dequeue_unknown_atios(vha, 0);
  }
  
  static bool qlt_24xx_atio_pkt_all_vps(struct scsi_qla_host *vha,
  	struct atio_from_isp *atio, uint8_t ha_locked)
  {
  	ql_dbg(ql_dbg_tgt, vha, 0xe072,
  		"%s: qla_target(%d): type %x ox_id %04x\n",
  		__func__, vha->vp_idx, atio->u.raw.entry_type,
  		be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id));
  
  	switch (atio->u.raw.entry_type) {
  	case ATIO_TYPE7:
  	{
  		struct scsi_qla_host *host = qlt_find_host_by_d_id(vha,
  		    atio->u.isp24.fcp_hdr.d_id);
  		if (unlikely(NULL == host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe03e,
  			    "qla_target(%d): Received ATIO_TYPE7 "
  			    "with unknown d_id %x:%x:%x\n", vha->vp_idx,
  			    atio->u.isp24.fcp_hdr.d_id.domain,
  			    atio->u.isp24.fcp_hdr.d_id.area,
  			    atio->u.isp24.fcp_hdr.d_id.al_pa);
  
  
  			qlt_queue_unknown_atio(vha, atio, ha_locked);
  			break;
  		}
  		if (unlikely(!list_empty(&vha->unknown_atio_list)))
  			qlt_try_to_dequeue_unknown_atios(vha, ha_locked);
  
  		qlt_24xx_atio_pkt(host, atio, ha_locked);
  		break;
  	}
  
  	case IMMED_NOTIFY_TYPE:
  	{
  		struct scsi_qla_host *host = vha;
  		struct imm_ntfy_from_isp *entry =
  		    (struct imm_ntfy_from_isp *)atio;
  
  		qlt_issue_marker(vha, ha_locked);
  
  		if ((entry->u.isp24.vp_index != 0xFF) &&
  		    (entry->u.isp24.nport_handle != 0xFFFF)) {
  			host = qlt_find_host_by_vp_idx(vha,
  			    entry->u.isp24.vp_index);
  			if (unlikely(!host)) {
  				ql_dbg(ql_dbg_tgt, vha, 0xe03f,
  				    "qla_target(%d): Received "
  				    "ATIO (IMMED_NOTIFY_TYPE) "
  				    "with unknown vp_index %d\n",
  				    vha->vp_idx, entry->u.isp24.vp_index);
  				break;
  			}
  		}
  		qlt_24xx_atio_pkt(host, atio, ha_locked);
  		break;
  	}
  
  	case VP_RPT_ID_IOCB_TYPE:
  		qla24xx_report_id_acquisition(vha,
  			(struct vp_rpt_id_entry_24xx *)atio);
  		break;
  
  	case ABTS_RECV_24XX:
  	{
  		struct abts_recv_from_24xx *entry =
  			(struct abts_recv_from_24xx *)atio;
  		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
  			entry->vp_index);
  		unsigned long flags;
  
  		if (unlikely(!host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe00a,
  			    "qla_target(%d): Response pkt (ABTS_RECV_24XX) "
  			    "received, with unknown vp_index %d\n",
  			    vha->vp_idx, entry->vp_index);
  			break;
  		}
  		if (!ha_locked)
  			spin_lock_irqsave(&host->hw->hardware_lock, flags);
  		qlt_24xx_handle_abts(host, (struct abts_recv_from_24xx *)atio);
  		if (!ha_locked)
  			spin_unlock_irqrestore(&host->hw->hardware_lock, flags);
  		break;
  	}
  
  	/* case PUREX_IOCB_TYPE: ql2xmvasynctoatio */
  
  	default:
  		ql_dbg(ql_dbg_tgt, vha, 0xe040,
  		    "qla_target(%d): Received unknown ATIO atio "
  		    "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
  		break;
  	}
  
  	return false;
  }
  
  void qlt_response_pkt_all_vps(struct scsi_qla_host *vha,
  	struct rsp_que *rsp, response_t *pkt)
  {
  	switch (pkt->entry_type) {
  	case CTIO_CRC2:
  		ql_dbg(ql_dbg_tgt, vha, 0xe073,
  			"qla_target(%d):%s: CRC2 Response pkt\n",
  			vha->vp_idx, __func__);
  		/* fall through */
  	case CTIO_TYPE7:
  	{
  		struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
  		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
  		    entry->vp_index);
  		if (unlikely(!host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe041,
  			    "qla_target(%d): Response pkt (CTIO_TYPE7) "
  			    "received, with unknown vp_index %d\n",
  			    vha->vp_idx, entry->vp_index);
  			break;
  		}
  		qlt_response_pkt(host, rsp, pkt);
  		break;
  	}
  
  	case IMMED_NOTIFY_TYPE:
  	{
  		struct scsi_qla_host *host = vha;
  		struct imm_ntfy_from_isp *entry =
  		    (struct imm_ntfy_from_isp *)pkt;
  
  		host = qlt_find_host_by_vp_idx(vha, entry->u.isp24.vp_index);
  		if (unlikely(!host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe042,
  			    "qla_target(%d): Response pkt (IMMED_NOTIFY_TYPE) "
  			    "received, with unknown vp_index %d\n",
  			    vha->vp_idx, entry->u.isp24.vp_index);
  			break;
  		}
  		qlt_response_pkt(host, rsp, pkt);
  		break;
  	}
  
  	case NOTIFY_ACK_TYPE:
  	{
  		struct scsi_qla_host *host = vha;
  		struct nack_to_isp *entry = (struct nack_to_isp *)pkt;
  
  		if (0xFF != entry->u.isp24.vp_index) {
  			host = qlt_find_host_by_vp_idx(vha,
  			    entry->u.isp24.vp_index);
  			if (unlikely(!host)) {
  				ql_dbg(ql_dbg_tgt, vha, 0xe043,
  				    "qla_target(%d): Response "
  				    "pkt (NOTIFY_ACK_TYPE) "
  				    "received, with unknown "
  				    "vp_index %d\n", vha->vp_idx,
  				    entry->u.isp24.vp_index);
  				break;
  			}
  		}
  		qlt_response_pkt(host, rsp, pkt);
  		break;
  	}
  
  	case ABTS_RECV_24XX:
  	{
  		struct abts_recv_from_24xx *entry =
  		    (struct abts_recv_from_24xx *)pkt;
  		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
  		    entry->vp_index);
  		if (unlikely(!host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe044,
  			    "qla_target(%d): Response pkt "
  			    "(ABTS_RECV_24XX) received, with unknown "
  			    "vp_index %d\n", vha->vp_idx, entry->vp_index);
  			break;
  		}
  		qlt_response_pkt(host, rsp, pkt);
  		break;
  	}
  
  	case ABTS_RESP_24XX:
  	{
  		struct abts_resp_to_24xx *entry =
  		    (struct abts_resp_to_24xx *)pkt;
  		struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
  		    entry->vp_index);
  		if (unlikely(!host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe045,
  			    "qla_target(%d): Response pkt "
  			    "(ABTS_RECV_24XX) received, with unknown "
  			    "vp_index %d\n", vha->vp_idx, entry->vp_index);
  			break;
  		}
  		qlt_response_pkt(host, rsp, pkt);
  		break;
  	}
  	default:
  		qlt_response_pkt(vha, rsp, pkt);
  		break;
  	}
  
  }
  
  /*
   * All qlt_plogi_ack_t operations are protected by hardware_lock
   */
  static int qla24xx_post_nack_work(struct scsi_qla_host *vha, fc_port_t *fcport,
  	struct imm_ntfy_from_isp *ntfy, int type)
  {
  	struct qla_work_evt *e;
  
  	e = qla2x00_alloc_work(vha, QLA_EVT_NACK);
  	if (!e)
  		return QLA_FUNCTION_FAILED;
  
  	e->u.nack.fcport = fcport;
  	e->u.nack.type = type;
  	memcpy(e->u.nack.iocb, ntfy, sizeof(struct imm_ntfy_from_isp));
  	return qla2x00_post_work(vha, e);
  }
  
  static void qla2x00_async_nack_sp_done(srb_t *sp, int res)
  {
  	struct scsi_qla_host *vha = sp->vha;
  	unsigned long flags;
  
  	ql_dbg(ql_dbg_disc, vha, 0x20f2,
  	    "Async done-%s res %x %8phC  type %d\n",
  	    sp->name, res, sp->fcport->port_name, sp->type);
  
  	spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
  	sp->fcport->flags &= ~FCF_ASYNC_SENT;
  	sp->fcport->chip_reset = vha->hw->base_qpair->chip_reset;
  
  	switch (sp->type) {
  	case SRB_NACK_PLOGI:
  		sp->fcport->login_gen++;
  		sp->fcport->fw_login_state = DSC_LS_PLOGI_COMP;
  		sp->fcport->logout_on_delete = 1;
  		sp->fcport->plogi_nack_done_deadline = jiffies + HZ;
  		sp->fcport->send_els_logo = 0;
  		break;
  
  	case SRB_NACK_PRLI:
  		sp->fcport->fw_login_state = DSC_LS_PRLI_COMP;
  		sp->fcport->deleted = 0;
  		sp->fcport->send_els_logo = 0;
  
  		if (!sp->fcport->login_succ &&
  		    !IS_SW_RESV_ADDR(sp->fcport->d_id)) {
  			sp->fcport->login_succ = 1;
  
  			vha->fcport_count++;
  			spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  			qla24xx_sched_upd_fcport(sp->fcport);
  			spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
  		} else {
  			sp->fcport->login_retry = 0;
  			sp->fcport->disc_state = DSC_LOGIN_COMPLETE;
  			sp->fcport->deleted = 0;
  			sp->fcport->logout_on_delete = 1;
  		}
  		break;
  
  	case SRB_NACK_LOGO:
  		sp->fcport->login_gen++;
  		sp->fcport->fw_login_state = DSC_LS_PORT_UNAVAIL;
  		qlt_logo_completion_handler(sp->fcport, MBS_COMMAND_COMPLETE);
  		break;
  	}
  	spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  
  	sp->free(sp);
  }
  
  int qla24xx_async_notify_ack(scsi_qla_host_t *vha, fc_port_t *fcport,
  	struct imm_ntfy_from_isp *ntfy, int type)
  {
  	int rval = QLA_FUNCTION_FAILED;
  	srb_t *sp;
  	char *c = NULL;
  
  	fcport->flags |= FCF_ASYNC_SENT;
  	switch (type) {
  	case SRB_NACK_PLOGI:
  		fcport->fw_login_state = DSC_LS_PLOGI_PEND;
  		c = "PLOGI";
  		break;
  	case SRB_NACK_PRLI:
  		fcport->fw_login_state = DSC_LS_PRLI_PEND;
  		fcport->deleted = 0;
  		c = "PRLI";
  		break;
  	case SRB_NACK_LOGO:
  		fcport->fw_login_state = DSC_LS_LOGO_PEND;
  		c = "LOGO";
  		break;
  	}
  
  	sp = qla2x00_get_sp(vha, fcport, GFP_ATOMIC);
  	if (!sp)
  		goto done;
  
  	sp->type = type;
  	sp->name = "nack";
  
  	sp->u.iocb_cmd.timeout = qla2x00_async_iocb_timeout;
  	qla2x00_init_timer(sp, qla2x00_get_async_timeout(vha)+2);
  
  	sp->u.iocb_cmd.u.nack.ntfy = ntfy;
  	sp->done = qla2x00_async_nack_sp_done;
  
  	ql_dbg(ql_dbg_disc, vha, 0x20f4,
  	    "Async-%s %8phC hndl %x %s\n",
  	    sp->name, fcport->port_name, sp->handle, c);
  
  	rval = qla2x00_start_sp(sp);
  	if (rval != QLA_SUCCESS)
  		goto done_free_sp;
  
  	return rval;
  
  done_free_sp:
  	sp->free(sp);
  done:
  	fcport->flags &= ~FCF_ASYNC_SENT;
  	return rval;
  }
  
  void qla24xx_do_nack_work(struct scsi_qla_host *vha, struct qla_work_evt *e)
  {
  	fc_port_t *t;
  
  	switch (e->u.nack.type) {
  	case SRB_NACK_PRLI:
  		t = e->u.nack.fcport;
  		flush_work(&t->del_work);
  		flush_work(&t->free_work);
  		mutex_lock(&vha->vha_tgt.tgt_mutex);
  		t = qlt_create_sess(vha, e->u.nack.fcport, 0);
  		mutex_unlock(&vha->vha_tgt.tgt_mutex);
  		if (t) {
  			ql_log(ql_log_info, vha, 0xd034,
  			    "%s create sess success %p", __func__, t);
  			/* create sess has an extra kref */
  			vha->hw->tgt.tgt_ops->put_sess(e->u.nack.fcport);
  		}
  		break;
  	}
  	qla24xx_async_notify_ack(vha, e->u.nack.fcport,
  	    (struct imm_ntfy_from_isp *)e->u.nack.iocb, e->u.nack.type);
  }
  
  void qla24xx_delete_sess_fn(struct work_struct *work)
  {
  	fc_port_t *fcport = container_of(work, struct fc_port, del_work);
  	struct qla_hw_data *ha = fcport->vha->hw;
  
  	if (fcport->se_sess) {
  		ha->tgt.tgt_ops->shutdown_sess(fcport);
  		ha->tgt.tgt_ops->put_sess(fcport);
  	} else {
  		qlt_unreg_sess(fcport);
  	}
  }
  
  /*
   * Called from qla2x00_reg_remote_port()
   */
  void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct fc_port *sess = fcport;
  	unsigned long flags;
  
  	if (!vha->hw->tgt.tgt_ops)
  		return;
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	if (tgt->tgt_stop) {
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  		return;
  	}
  
  	if (fcport->disc_state == DSC_DELETE_PEND) {
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  		return;
  	}
  
  	if (!sess->se_sess) {
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  		mutex_lock(&vha->vha_tgt.tgt_mutex);
  		sess = qlt_create_sess(vha, fcport, false);
  		mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	} else {
  		if (fcport->fw_login_state == DSC_LS_PRLI_COMP) {
  			spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  			return;
  		}
  
  		if (!kref_get_unless_zero(&sess->sess_kref)) {
  			ql_dbg(ql_dbg_disc, vha, 0x2107,
  			    "%s: kref_get fail sess %8phC \n",
  			    __func__, sess->port_name);
  			spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  			return;
  		}
  
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04c,
  		    "qla_target(%u): %ssession for port %8phC "
  		    "(loop ID %d) reappeared\n", vha->vp_idx,
  		    sess->local ? "local " : "", sess->port_name, sess->loop_id);
  
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf007,
  		    "Reappeared sess %p\n", sess);
  
  		ha->tgt.tgt_ops->update_sess(sess, fcport->d_id,
  		    fcport->loop_id,
  		    (fcport->flags & FCF_CONF_COMP_SUPPORTED));
  	}
  
  	if (sess && sess->local) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04d,
  		    "qla_target(%u): local session for "
  		    "port %8phC (loop ID %d) became global\n", vha->vp_idx,
  		    fcport->port_name, sess->loop_id);
  		sess->local = 0;
  	}
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  	ha->tgt.tgt_ops->put_sess(sess);
  }
  
  /*
   * This is a zero-base ref-counting solution, since hardware_lock
   * guarantees that ref_count is not modified concurrently.
   * Upon successful return content of iocb is undefined
   */
  static struct qlt_plogi_ack_t *
  qlt_plogi_ack_find_add(struct scsi_qla_host *vha, port_id_t *id,
  		       struct imm_ntfy_from_isp *iocb)
  {
  	struct qlt_plogi_ack_t *pla;
  
  	lockdep_assert_held(&vha->hw->hardware_lock);
  
  	list_for_each_entry(pla, &vha->plogi_ack_list, list) {
  		if (pla->id.b24 == id->b24) {
  			ql_dbg(ql_dbg_disc + ql_dbg_verbose, vha, 0x210d,
  			    "%s %d %8phC Term INOT due to new INOT",
  			    __func__, __LINE__,
  			    pla->iocb.u.isp24.port_name);
  			qlt_send_term_imm_notif(vha, &pla->iocb, 1);
  			memcpy(&pla->iocb, iocb, sizeof(pla->iocb));
  			return pla;
  		}
  	}
  
  	pla = kmem_cache_zalloc(qla_tgt_plogi_cachep, GFP_ATOMIC);
  	if (!pla) {
  		ql_dbg(ql_dbg_async, vha, 0x5088,
  		       "qla_target(%d): Allocation of plogi_ack failed\n",
  		       vha->vp_idx);
  		return NULL;
  	}
  
  	memcpy(&pla->iocb, iocb, sizeof(pla->iocb));
  	pla->id = *id;
  	list_add_tail(&pla->list, &vha->plogi_ack_list);
  
  	return pla;
  }
  
  void qlt_plogi_ack_unref(struct scsi_qla_host *vha,
      struct qlt_plogi_ack_t *pla)
  {
  	struct imm_ntfy_from_isp *iocb = &pla->iocb;
  	port_id_t port_id;
  	uint16_t loop_id;
  	fc_port_t *fcport = pla->fcport;
  
  	BUG_ON(!pla->ref_count);
  	pla->ref_count--;
  
  	if (pla->ref_count)
  		return;
  
  	ql_dbg(ql_dbg_disc, vha, 0x5089,
  	    "Sending PLOGI ACK to wwn %8phC s_id %02x:%02x:%02x loop_id %#04x"
  	    " exch %#x ox_id %#x\n", iocb->u.isp24.port_name,
  	    iocb->u.isp24.port_id[2], iocb->u.isp24.port_id[1],
  	    iocb->u.isp24.port_id[0],
  	    le16_to_cpu(iocb->u.isp24.nport_handle),
  	    iocb->u.isp24.exchange_address, iocb->ox_id);
  
  	port_id.b.domain = iocb->u.isp24.port_id[2];
  	port_id.b.area   = iocb->u.isp24.port_id[1];
  	port_id.b.al_pa  = iocb->u.isp24.port_id[0];
  	port_id.b.rsvd_1 = 0;
  
  	loop_id = le16_to_cpu(iocb->u.isp24.nport_handle);
  
  	fcport->loop_id = loop_id;
  	fcport->d_id = port_id;
  	if (iocb->u.isp24.status_subcode == ELS_PLOGI)
  		qla24xx_post_nack_work(vha, fcport, iocb, SRB_NACK_PLOGI);
  	else
  		qla24xx_post_nack_work(vha, fcport, iocb, SRB_NACK_PRLI);
  
  	list_for_each_entry(fcport, &vha->vp_fcports, list) {
  		if (fcport->plogi_link[QLT_PLOGI_LINK_SAME_WWN] == pla)
  			fcport->plogi_link[QLT_PLOGI_LINK_SAME_WWN] = NULL;
  		if (fcport->plogi_link[QLT_PLOGI_LINK_CONFLICT] == pla)
  			fcport->plogi_link[QLT_PLOGI_LINK_CONFLICT] = NULL;
  	}
  
  	list_del(&pla->list);
  	kmem_cache_free(qla_tgt_plogi_cachep, pla);
  }
  
  void
  qlt_plogi_ack_link(struct scsi_qla_host *vha, struct qlt_plogi_ack_t *pla,
      struct fc_port *sess, enum qlt_plogi_link_t link)
  {
  	struct imm_ntfy_from_isp *iocb = &pla->iocb;
  	/* Inc ref_count first because link might already be pointing at pla */
  	pla->ref_count++;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf097,
  		"Linking sess %p [%d] wwn %8phC with PLOGI ACK to wwn %8phC"
  		" s_id %02x:%02x:%02x, ref=%d pla %p link %d\n",
  		sess, link, sess->port_name,
  		iocb->u.isp24.port_name, iocb->u.isp24.port_id[2],
  		iocb->u.isp24.port_id[1], iocb->u.isp24.port_id[0],
  		pla->ref_count, pla, link);
  
  	if (link == QLT_PLOGI_LINK_CONFLICT) {
  		switch (sess->disc_state) {
  		case DSC_DELETED:
  		case DSC_DELETE_PEND:
  			pla->ref_count--;
  			return;
  		default:
  			break;
  		}
  	}
  
  	if (sess->plogi_link[link])
  		qlt_plogi_ack_unref(vha, sess->plogi_link[link]);
  
  	if (link == QLT_PLOGI_LINK_SAME_WWN)
  		pla->fcport = sess;
  
  	sess->plogi_link[link] = pla;
  }
  
  typedef struct {
  	/* These fields must be initialized by the caller */
  	port_id_t id;
  	/*
  	 * number of cmds dropped while we were waiting for
  	 * initiator to ack LOGO initialize to 1 if LOGO is
  	 * triggered by a command, otherwise, to 0
  	 */
  	int cmd_count;
  
  	/* These fields are used by callee */
  	struct list_head list;
  } qlt_port_logo_t;
  
  static void
  qlt_send_first_logo(struct scsi_qla_host *vha, qlt_port_logo_t *logo)
  {
  	qlt_port_logo_t *tmp;
  	int res;
  
  	mutex_lock(&vha->vha_tgt.tgt_mutex);
  
  	list_for_each_entry(tmp, &vha->logo_list, list) {
  		if (tmp->id.b24 == logo->id.b24) {
  			tmp->cmd_count += logo->cmd_count;
  			mutex_unlock(&vha->vha_tgt.tgt_mutex);
  			return;
  		}
  	}
  
  	list_add_tail(&logo->list, &vha->logo_list);
  
  	mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  	res = qla24xx_els_dcmd_iocb(vha, ELS_DCMD_LOGO, logo->id);
  
  	mutex_lock(&vha->vha_tgt.tgt_mutex);
  	list_del(&logo->list);
  	mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf098,
  	    "Finished LOGO to %02x:%02x:%02x, dropped %d cmds, res = %#x\n",
  	    logo->id.b.domain, logo->id.b.area, logo->id.b.al_pa,
  	    logo->cmd_count, res);
  }
  
  void qlt_free_session_done(struct work_struct *work)
  {
  	struct fc_port *sess = container_of(work, struct fc_port,
  	    free_work);
  	struct qla_tgt *tgt = sess->tgt;
  	struct scsi_qla_host *vha = sess->vha;
  	struct qla_hw_data *ha = vha->hw;
  	unsigned long flags;
  	bool logout_started = false;
  	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
  	struct qlt_plogi_ack_t *own =
  		sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN];
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf084,
  		"%s: se_sess %p / sess %p from port %8phC loop_id %#04x"
  		" s_id %02x:%02x:%02x logout %d keep %d els_logo %d\n",
  		__func__, sess->se_sess, sess, sess->port_name, sess->loop_id,
  		sess->d_id.b.domain, sess->d_id.b.area, sess->d_id.b.al_pa,
  		sess->logout_on_delete, sess->keep_nport_handle,
  		sess->send_els_logo);
  
  	if (!IS_SW_RESV_ADDR(sess->d_id)) {
  		qla2x00_mark_device_lost(vha, sess, 0, 0);
  
  		if (sess->send_els_logo) {
  			qlt_port_logo_t logo;
  
  			logo.id = sess->d_id;
  			logo.cmd_count = 0;
  			if (!own)
  				qlt_send_first_logo(vha, &logo);
  			sess->send_els_logo = 0;
  		}
  
  		if (sess->logout_on_delete && sess->loop_id != FC_NO_LOOP_ID) {
  			int rc;
  
  			if (!own ||
  			    (own &&
  			     (own->iocb.u.isp24.status_subcode == ELS_PLOGI))) {
  				rc = qla2x00_post_async_logout_work(vha, sess,
  				    NULL);
  				if (rc != QLA_SUCCESS)
  					ql_log(ql_log_warn, vha, 0xf085,
  					    "Schedule logo failed sess %p rc %d\n",
  					    sess, rc);
  				else
  					logout_started = true;
  			} else if (own && (own->iocb.u.isp24.status_subcode ==
  				ELS_PRLI) && ha->flags.rida_fmt2) {
  				rc = qla2x00_post_async_prlo_work(vha, sess,
  				    NULL);
  				if (rc != QLA_SUCCESS)
  					ql_log(ql_log_warn, vha, 0xf085,
  					    "Schedule PRLO failed sess %p rc %d\n",
  					    sess, rc);
  				else
  					logout_started = true;
  			}
  		} /* if sess->logout_on_delete */
  
  		if (sess->nvme_flag & NVME_FLAG_REGISTERED &&
  		    !(sess->nvme_flag & NVME_FLAG_DELETING)) {
  			sess->nvme_flag |= NVME_FLAG_DELETING;
  			qla_nvme_unregister_remote_port(sess);
  		}
  	}
  
  	/*
  	 * Release the target session for FC Nexus from fabric module code.
  	 */
  	if (sess->se_sess != NULL)
  		ha->tgt.tgt_ops->free_session(sess);
  
  	if (logout_started) {
  		bool traced = false;
  		u16 cnt = 0;
  
  		while (!READ_ONCE(sess->logout_completed)) {
  			if (!traced) {
  				ql_dbg(ql_dbg_tgt_mgt, vha, 0xf086,
  					"%s: waiting for sess %p logout\n",
  					__func__, sess);
  				traced = true;
  			}
  			msleep(100);
  			cnt++;
  			if (cnt > 200)
  				break;
  		}
  
  		ql_dbg(ql_dbg_disc, vha, 0xf087,
  		    "%s: sess %p logout completed\n", __func__, sess);
  	}
  
  	if (sess->logo_ack_needed) {
  		sess->logo_ack_needed = 0;
  		qla24xx_async_notify_ack(vha, sess,
  			(struct imm_ntfy_from_isp *)sess->iocb, SRB_NACK_LOGO);
  	}
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	if (sess->se_sess) {
  		sess->se_sess = NULL;
  		if (tgt && !IS_SW_RESV_ADDR(sess->d_id))
  			tgt->sess_count--;
  	}
  
  	sess->disc_state = DSC_DELETED;
  	sess->fw_login_state = DSC_LS_PORT_UNAVAIL;
  	sess->deleted = QLA_SESS_DELETED;
  
  	if (sess->login_succ && !IS_SW_RESV_ADDR(sess->d_id)) {
  		vha->fcport_count--;
  		sess->login_succ = 0;
  	}
  
  	qla2x00_clear_loop_id(sess);
  
  	if (sess->conflict) {
  		sess->conflict->login_pause = 0;
  		sess->conflict = NULL;
  		if (!test_bit(UNLOADING, &vha->dpc_flags))
  			set_bit(RELOGIN_NEEDED, &vha->dpc_flags);
  	}
  
  	{
  		struct qlt_plogi_ack_t *con =
  		    sess->plogi_link[QLT_PLOGI_LINK_CONFLICT];
  		struct imm_ntfy_from_isp *iocb;
  
  		own = sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN];
  
  		if (con) {
  			iocb = &con->iocb;
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf099,
  				 "se_sess %p / sess %p port %8phC is gone,"
  				 " %s (ref=%d), releasing PLOGI for %8phC (ref=%d)\n",
  				 sess->se_sess, sess, sess->port_name,
  				 own ? "releasing own PLOGI" : "no own PLOGI pending",
  				 own ? own->ref_count : -1,
  				 iocb->u.isp24.port_name, con->ref_count);
  			qlt_plogi_ack_unref(vha, con);
  			sess->plogi_link[QLT_PLOGI_LINK_CONFLICT] = NULL;
  		} else {
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf09a,
  			    "se_sess %p / sess %p port %8phC is gone, %s (ref=%d)\n",
  			    sess->se_sess, sess, sess->port_name,
  			    own ? "releasing own PLOGI" :
  			    "no own PLOGI pending",
  			    own ? own->ref_count : -1);
  		}
  
  		if (own) {
  			sess->fw_login_state = DSC_LS_PLOGI_PEND;
  			qlt_plogi_ack_unref(vha, own);
  			sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN] = NULL;
  		}
  	}
  
  	sess->explicit_logout = 0;
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  	sess->free_pending = 0;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf001,
  	    "Unregistration of sess %p %8phC finished fcp_cnt %d\n",
  		sess, sess->port_name, vha->fcport_count);
  
  	if (tgt && (tgt->sess_count == 0))
  		wake_up_all(&tgt->waitQ);
  
  	if (!test_bit(PFLG_DRIVER_REMOVING, &base_vha->pci_flags) &&
  	    !(vha->vp_idx && test_bit(VPORT_DELETE, &vha->dpc_flags)) &&
  	    (!tgt || !tgt->tgt_stop) && !LOOP_TRANSITION(vha)) {
  		switch (vha->host->active_mode) {
  		case MODE_INITIATOR:
  		case MODE_DUAL:
  			set_bit(RELOGIN_NEEDED, &vha->dpc_flags);
  			qla2xxx_wake_dpc(vha);
  			break;
  		case MODE_TARGET:
  		default:
  			/* no-op */
  			break;
  		}
  	}
  
  	if (vha->fcport_count == 0)
  		wake_up_all(&vha->fcport_waitQ);
  }
  
  /* ha->tgt.sess_lock supposed to be held on entry */
  void qlt_unreg_sess(struct fc_port *sess)
  {
  	struct scsi_qla_host *vha = sess->vha;
  	unsigned long flags;
  
  	ql_dbg(ql_dbg_disc, sess->vha, 0x210a,
  	    "%s sess %p for deletion %8phC\n",
  	    __func__, sess, sess->port_name);
  
  	spin_lock_irqsave(&sess->vha->work_lock, flags);
  	if (sess->free_pending) {
  		spin_unlock_irqrestore(&sess->vha->work_lock, flags);
  		return;
  	}
  	sess->free_pending = 1;
  	spin_unlock_irqrestore(&sess->vha->work_lock, flags);
  
  	if (sess->se_sess)
  		vha->hw->tgt.tgt_ops->clear_nacl_from_fcport_map(sess);
  
  	sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
  	sess->disc_state = DSC_DELETE_PEND;
  	sess->last_rscn_gen = sess->rscn_gen;
  	sess->last_login_gen = sess->login_gen;
  
  	queue_work(sess->vha->hw->wq, &sess->free_work);
  }
  EXPORT_SYMBOL(qlt_unreg_sess);
  
  static int qlt_reset(struct scsi_qla_host *vha, void *iocb, int mcmd)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess = NULL;
  	uint16_t loop_id;
  	int res = 0;
  	struct imm_ntfy_from_isp *n = (struct imm_ntfy_from_isp *)iocb;
  	unsigned long flags;
  
  	loop_id = le16_to_cpu(n->u.isp24.nport_handle);
  	if (loop_id == 0xFFFF) {
  		/* Global event */
  		atomic_inc(&vha->vha_tgt.qla_tgt->tgt_global_resets_count);
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  		qlt_clear_tgt_db(vha->vha_tgt.qla_tgt);
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  	} else {
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  		sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  	}
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe000,
  	    "Using sess for qla_tgt_reset: %p\n", sess);
  	if (!sess) {
  		res = -ESRCH;
  		return res;
  	}
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe047,
  	    "scsi(%ld): resetting (session %p from port %8phC mcmd %x, "
  	    "loop_id %d)\n", vha->host_no, sess, sess->port_name,
  	    mcmd, loop_id);
  
  	return qlt_issue_task_mgmt(sess, 0, mcmd, iocb, QLA24XX_MGMT_SEND_NACK);
  }
  
  static void qla24xx_chk_fcp_state(struct fc_port *sess)
  {
  	if (sess->chip_reset != sess->vha->hw->base_qpair->chip_reset) {
  		sess->logout_on_delete = 0;
  		sess->logo_ack_needed = 0;
  		sess->fw_login_state = DSC_LS_PORT_UNAVAIL;
  	}
  }
  
  void qlt_schedule_sess_for_deletion(struct fc_port *sess)
  {
  	struct qla_tgt *tgt = sess->tgt;
  	unsigned long flags;
  	u16 sec;
  
  	switch (sess->disc_state) {
  	case DSC_DELETE_PEND:
  		return;
  	case DSC_DELETED:
  		if (tgt && tgt->tgt_stop && (tgt->sess_count == 0))
  			wake_up_all(&tgt->waitQ);
  		if (sess->vha->fcport_count == 0)
  			wake_up_all(&sess->vha->fcport_waitQ);
  
  		if (!sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN] &&
  			!sess->plogi_link[QLT_PLOGI_LINK_CONFLICT])
  			return;
  		break;
  	case DSC_UPD_FCPORT:
  		/*
  		 * This port is not done reporting to upper layer.
  		 * let it finish
  		 */
  		sess->next_disc_state = DSC_DELETE_PEND;
  		sec = jiffies_to_msecs(jiffies -
  		    sess->jiffies_at_registration)/1000;
  		if (sess->sec_since_registration < sec && sec && !(sec % 5)) {
  			sess->sec_since_registration = sec;
  			ql_dbg(ql_dbg_disc, sess->vha, 0xffff,
  			    "%s %8phC : Slow Rport registration(%d Sec)\n",
  			    __func__, sess->port_name, sec);
  		}
  		return;
  	default:
  		break;
  	}
  
  	spin_lock_irqsave(&sess->vha->work_lock, flags);
  	if (sess->deleted == QLA_SESS_DELETION_IN_PROGRESS) {
  		spin_unlock_irqrestore(&sess->vha->work_lock, flags);
  		return;
  	}
  	sess->deleted = QLA_SESS_DELETION_IN_PROGRESS;
  	spin_unlock_irqrestore(&sess->vha->work_lock, flags);
  
  	sess->prli_pend_timer = 0;
  	sess->disc_state = DSC_DELETE_PEND;
  
  	qla24xx_chk_fcp_state(sess);
  
  	ql_dbg(ql_dbg_disc, sess->vha, 0xe001,
  	    "Scheduling sess %p for deletion %8phC\n",
  	    sess, sess->port_name);
  
  	WARN_ON(!queue_work(sess->vha->hw->wq, &sess->del_work));
  }
  
  static void qlt_clear_tgt_db(struct qla_tgt *tgt)
  {
  	struct fc_port *sess;
  	scsi_qla_host_t *vha = tgt->vha;
  
  	list_for_each_entry(sess, &vha->vp_fcports, list) {
  		if (sess->se_sess)
  			qlt_schedule_sess_for_deletion(sess);
  	}
  
  	/* At this point tgt could be already dead */
  }
  
  static int qla24xx_get_loop_id(struct scsi_qla_host *vha, be_id_t s_id,
  	uint16_t *loop_id)
  {
  	struct qla_hw_data *ha = vha->hw;
  	dma_addr_t gid_list_dma;
  	struct gid_list_info *gid_list, *gid;
  	int res, rc, i;
  	uint16_t entries;
  
  	gid_list = dma_alloc_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
  	    &gid_list_dma, GFP_KERNEL);
  	if (!gid_list) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf044,
  		    "qla_target(%d): DMA Alloc failed of %u\n",
  		    vha->vp_idx, qla2x00_gid_list_size(ha));
  		return -ENOMEM;
  	}
  
  	/* Get list of logged in devices */
  	rc = qla24xx_gidlist_wait(vha, gid_list, gid_list_dma, &entries);
  	if (rc != QLA_SUCCESS) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf045,
  		    "qla_target(%d): get_id_list() failed: %x\n",
  		    vha->vp_idx, rc);
  		res = -EBUSY;
  		goto out_free_id_list;
  	}
  
  	gid = gid_list;
  	res = -ENOENT;
  	for (i = 0; i < entries; i++) {
  		if (gid->al_pa == s_id.al_pa &&
  		    gid->area == s_id.area &&
  		    gid->domain == s_id.domain) {
  			*loop_id = le16_to_cpu(gid->loop_id);
  			res = 0;
  			break;
  		}
  		gid = (void *)gid + ha->gid_list_info_size;
  	}
  
  out_free_id_list:
  	dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
  	    gid_list, gid_list_dma);
  	return res;
  }
  
  /*
   * Adds an extra ref to allow to drop hw lock after adding sess to the list.
   * Caller must put it.
   */
  static struct fc_port *qlt_create_sess(
  	struct scsi_qla_host *vha,
  	fc_port_t *fcport,
  	bool local)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess = fcport;
  	unsigned long flags;
  
  	if (vha->vha_tgt.qla_tgt->tgt_stop)
  		return NULL;
  
  	if (fcport->se_sess) {
  		if (!kref_get_unless_zero(&sess->sess_kref)) {
  			ql_dbg(ql_dbg_disc, vha, 0x20f6,
  			    "%s: kref_get_unless_zero failed for %8phC\n",
  			    __func__, sess->port_name);
  			return NULL;
  		}
  		return fcport;
  	}
  	sess->tgt = vha->vha_tgt.qla_tgt;
  	sess->local = local;
  
  	/*
  	 * Under normal circumstances we want to logout from firmware when
  	 * session eventually ends and release corresponding nport handle.
  	 * In the exception cases (e.g. when new PLOGI is waiting) corresponding
  	 * code will adjust these flags as necessary.
  	 */
  	sess->logout_on_delete = 1;
  	sess->keep_nport_handle = 0;
  	sess->logout_completed = 0;
  
  	if (ha->tgt.tgt_ops->check_initiator_node_acl(vha,
  	    &fcport->port_name[0], sess) < 0) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf015,
  		    "(%d) %8phC check_initiator_node_acl failed\n",
  		    vha->vp_idx, fcport->port_name);
  		return NULL;
  	} else {
  		kref_init(&fcport->sess_kref);
  		/*
  		 * Take an extra reference to ->sess_kref here to handle
  		 * fc_port access across ->tgt.sess_lock reaquire.
  		 */
  		if (!kref_get_unless_zero(&sess->sess_kref)) {
  			ql_dbg(ql_dbg_disc, vha, 0x20f7,
  			    "%s: kref_get_unless_zero failed for %8phC\n",
  			    __func__, sess->port_name);
  			return NULL;
  		}
  
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  		if (!IS_SW_RESV_ADDR(sess->d_id))
  			vha->vha_tgt.qla_tgt->sess_count++;
  
  		qlt_do_generation_tick(vha, &sess->generation);
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  	}
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf006,
  	    "Adding sess %p se_sess %p  to tgt %p sess_count %d\n",
  	    sess, sess->se_sess, vha->vha_tgt.qla_tgt,
  	    vha->vha_tgt.qla_tgt->sess_count);
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04b,
  	    "qla_target(%d): %ssession for wwn %8phC (loop_id %d, "
  	    "s_id %x:%x:%x, confirmed completion %ssupported) added\n",
  	    vha->vp_idx, local ?  "local " : "", fcport->port_name,
  	    fcport->loop_id, sess->d_id.b.domain, sess->d_id.b.area,
  	    sess->d_id.b.al_pa, sess->conf_compl_supported ?  "" : "not ");
  
  	return sess;
  }
  
  /*
   * max_gen - specifies maximum session generation
   * at which this deletion requestion is still valid
   */
  void
  qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport, int max_gen)
  {
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct fc_port *sess = fcport;
  	unsigned long flags;
  
  	if (!vha->hw->tgt.tgt_ops)
  		return;
  
  	if (!tgt)
  		return;
  
  	spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
  	if (tgt->tgt_stop) {
  		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  		return;
  	}
  	if (!sess->se_sess) {
  		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  		return;
  	}
  
  	if (max_gen - sess->generation < 0) {
  		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf092,
  		    "Ignoring stale deletion request for se_sess %p / sess %p"
  		    " for port %8phC, req_gen %d, sess_gen %d\n",
  		    sess->se_sess, sess, sess->port_name, max_gen,
  		    sess->generation);
  		return;
  	}
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf008, "qla_tgt_fc_port_deleted %p", sess);
  
  	sess->local = 1;
  	spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  	qlt_schedule_sess_for_deletion(sess);
  }
  
  static inline int test_tgt_sess_count(struct qla_tgt *tgt)
  {
  	struct qla_hw_data *ha = tgt->ha;
  	unsigned long flags;
  	int res;
  	/*
  	 * We need to protect against race, when tgt is freed before or
  	 * inside wake_up()
  	 */
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	ql_dbg(ql_dbg_tgt, tgt->vha, 0xe002,
  	    "tgt %p, sess_count=%d\n",
  	    tgt, tgt->sess_count);
  	res = (tgt->sess_count == 0);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  	return res;
  }
  
  /* Called by tcm_qla2xxx configfs code */
  int qlt_stop_phase1(struct qla_tgt *tgt)
  {
  	struct scsi_qla_host *vha = tgt->vha;
  	struct qla_hw_data *ha = tgt->ha;
  	unsigned long flags;
  
  	mutex_lock(&ha->optrom_mutex);
  	mutex_lock(&qla_tgt_mutex);
  
  	if (tgt->tgt_stop || tgt->tgt_stopped) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04e,
  		    "Already in tgt->tgt_stop or tgt_stopped state\n");
  		mutex_unlock(&qla_tgt_mutex);
  		mutex_unlock(&ha->optrom_mutex);
  		return -EPERM;
  	}
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
  	    vha->host_no, vha);
  	/*
  	 * Mutex needed to sync with qla_tgt_fc_port_[added,deleted].
  	 * Lock is needed, because we still can get an incoming packet.
  	 */
  	mutex_lock(&vha->vha_tgt.tgt_mutex);
  	tgt->tgt_stop = 1;
  	qlt_clear_tgt_db(tgt);
  	mutex_unlock(&vha->vha_tgt.tgt_mutex);
  	mutex_unlock(&qla_tgt_mutex);
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf009,
  	    "Waiting for sess works (tgt %p)", tgt);
  	spin_lock_irqsave(&tgt->sess_work_lock, flags);
  	while (!list_empty(&tgt->sess_works_list)) {
  		spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
  		flush_scheduled_work();
  		spin_lock_irqsave(&tgt->sess_work_lock, flags);
  	}
  	spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00a,
  	    "Waiting for tgt %p: sess_count=%d\n", tgt, tgt->sess_count);
  
  	wait_event_timeout(tgt->waitQ, test_tgt_sess_count(tgt), 10*HZ);
  
  	/* Big hammer */
  	if (!ha->flags.host_shutting_down &&
  	    (qla_tgt_mode_enabled(vha) || qla_dual_mode_enabled(vha)))
  		qlt_disable_vha(vha);
  
  	/* Wait for sessions to clear out (just in case) */
  	wait_event_timeout(tgt->waitQ, test_tgt_sess_count(tgt), 10*HZ);
  	mutex_unlock(&ha->optrom_mutex);
  
  	return 0;
  }
  EXPORT_SYMBOL(qlt_stop_phase1);
  
  /* Called by tcm_qla2xxx configfs code */
  void qlt_stop_phase2(struct qla_tgt *tgt)
  {
  	scsi_qla_host_t *vha = tgt->vha;
  
  	if (tgt->tgt_stopped) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04f,
  		    "Already in tgt->tgt_stopped state\n");
  		dump_stack();
  		return;
  	}
  	if (!tgt->tgt_stop) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00b,
  		    "%s: phase1 stop is not completed\n", __func__);
  		dump_stack();
  		return;
  	}
  
  	mutex_lock(&vha->vha_tgt.tgt_mutex);
  	tgt->tgt_stop = 0;
  	tgt->tgt_stopped = 1;
  	mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00c, "Stop of tgt %p finished\n",
  	    tgt);
  
  	switch (vha->qlini_mode) {
  	case QLA2XXX_INI_MODE_EXCLUSIVE:
  		vha->flags.online = 1;
  		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
  		break;
  	default:
  		break;
  	}
  }
  EXPORT_SYMBOL(qlt_stop_phase2);
  
  /* Called from qlt_remove_target() -> qla2x00_remove_one() */
  static void qlt_release(struct qla_tgt *tgt)
  {
  	scsi_qla_host_t *vha = tgt->vha;
  	void *node;
  	u64 key = 0;
  	u16 i;
  	struct qla_qpair_hint *h;
  	struct qla_hw_data *ha = vha->hw;
  
  	if (!tgt->tgt_stop && !tgt->tgt_stopped)
  		qlt_stop_phase1(tgt);
  
  	if (!tgt->tgt_stopped)
  		qlt_stop_phase2(tgt);
  
  	for (i = 0; i < vha->hw->max_qpairs + 1; i++) {
  		unsigned long flags;
  
  		h = &tgt->qphints[i];
  		if (h->qpair) {
  			spin_lock_irqsave(h->qpair->qp_lock_ptr, flags);
  			list_del(&h->hint_elem);
  			spin_unlock_irqrestore(h->qpair->qp_lock_ptr, flags);
  			h->qpair = NULL;
  		}
  	}
  	kfree(tgt->qphints);
  	mutex_lock(&qla_tgt_mutex);
  	list_del(&vha->vha_tgt.qla_tgt->tgt_list_entry);
  	mutex_unlock(&qla_tgt_mutex);
  
  	btree_for_each_safe64(&tgt->lun_qpair_map, key, node)
  		btree_remove64(&tgt->lun_qpair_map, key);
  
  	btree_destroy64(&tgt->lun_qpair_map);
  
  	if (vha->vp_idx)
  		if (ha->tgt.tgt_ops &&
  		    ha->tgt.tgt_ops->remove_target &&
  		    vha->vha_tgt.target_lport_ptr)
  			ha->tgt.tgt_ops->remove_target(vha);
  
  	vha->vha_tgt.qla_tgt = NULL;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00d,
  	    "Release of tgt %p finished\n", tgt);
  
  	kfree(tgt);
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_sched_sess_work(struct qla_tgt *tgt, int type,
  	const void *param, unsigned int param_size)
  {
  	struct qla_tgt_sess_work_param *prm;
  	unsigned long flags;
  
  	prm = kzalloc(sizeof(*prm), GFP_ATOMIC);
  	if (!prm) {
  		ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf050,
  		    "qla_target(%d): Unable to create session "
  		    "work, command will be refused", 0);
  		return -ENOMEM;
  	}
  
  	ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00e,
  	    "Scheduling work (type %d, prm %p)"
  	    " to find session for param %p (size %d, tgt %p)\n",
  	    type, prm, param, param_size, tgt);
  
  	prm->type = type;
  	memcpy(&prm->tm_iocb, param, param_size);
  
  	spin_lock_irqsave(&tgt->sess_work_lock, flags);
  	list_add_tail(&prm->sess_works_list_entry, &tgt->sess_works_list);
  	spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
  
  	schedule_work(&tgt->sess_work);
  
  	return 0;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_send_notify_ack(struct qla_qpair *qpair,
  	struct imm_ntfy_from_isp *ntfy,
  	uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
  	uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan)
  {
  	struct scsi_qla_host *vha = qpair->vha;
  	struct qla_hw_data *ha = vha->hw;
  	request_t *pkt;
  	struct nack_to_isp *nack;
  
  	if (!ha->flags.fw_started)
  		return;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe004, "Sending NOTIFY_ACK (ha=%p)\n", ha);
  
  	pkt = (request_t *)__qla2x00_alloc_iocbs(qpair, NULL);
  	if (!pkt) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe049,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet\n", vha->vp_idx, __func__);
  		return;
  	}
  
  	if (vha->vha_tgt.qla_tgt != NULL)
  		vha->vha_tgt.qla_tgt->notify_ack_expected++;
  
  	pkt->entry_type = NOTIFY_ACK_TYPE;
  	pkt->entry_count = 1;
  
  	nack = (struct nack_to_isp *)pkt;
  	nack->ox_id = ntfy->ox_id;
  
  	nack->u.isp24.handle = QLA_TGT_SKIP_HANDLE;
  	nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
  	if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
  		nack->u.isp24.flags = ntfy->u.isp24.flags &
  			cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
  	}
  	nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
  	nack->u.isp24.status = ntfy->u.isp24.status;
  	nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
  	nack->u.isp24.fw_handle = ntfy->u.isp24.fw_handle;
  	nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
  	nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
  	nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
  	nack->u.isp24.srr_flags = cpu_to_le16(srr_flags);
  	nack->u.isp24.srr_reject_code = srr_reject_code;
  	nack->u.isp24.srr_reject_code_expl = srr_explan;
  	nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe005,
  	    "qla_target(%d): Sending 24xx Notify Ack %d\n",
  	    vha->vp_idx, nack->u.isp24.status);
  
  	/* Memory Barrier */
  	wmb();
  	qla2x00_start_iocbs(vha, qpair->req);
  }
  
  static int qlt_build_abts_resp_iocb(struct qla_tgt_mgmt_cmd *mcmd)
  {
  	struct scsi_qla_host *vha = mcmd->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct abts_resp_to_24xx *resp;
  	uint32_t f_ctl, h;
  	uint8_t *p;
  	int rc;
  	struct abts_recv_from_24xx *abts = &mcmd->orig_iocb.abts;
  	struct qla_qpair *qpair = mcmd->qpair;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe006,
  	    "Sending task mgmt ABTS response (ha=%p, status=%x)\n",
  	    ha, mcmd->fc_tm_rsp);
  
  	rc = qlt_check_reserve_free_req(qpair, 1);
  	if (rc) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe04a,
  		    "qla_target(%d): %s failed: unable to allocate request packet\n",
  		    vha->vp_idx, __func__);
  		return -EAGAIN;
  	}
  
  	resp = (struct abts_resp_to_24xx *)qpair->req->ring_ptr;
  	memset(resp, 0, sizeof(*resp));
  
  	h = qlt_make_handle(qpair);
  	if (unlikely(h == QLA_TGT_NULL_HANDLE)) {
  		/*
  		 * CTIO type 7 from the firmware doesn't provide a way to
  		 * know the initiator's LOOP ID, hence we can't find
  		 * the session and, so, the command.
  		 */
  		return -EAGAIN;
  	} else {
  		qpair->req->outstanding_cmds[h] = (srb_t *)mcmd;
  	}
  
  	resp->handle = MAKE_HANDLE(qpair->req->id, h);
  	resp->entry_type = ABTS_RESP_24XX;
  	resp->entry_count = 1;
  	resp->nport_handle = abts->nport_handle;
  	resp->vp_index = vha->vp_idx;
  	resp->sof_type = abts->sof_type;
  	resp->exchange_address = abts->exchange_address;
  	resp->fcp_hdr_le = abts->fcp_hdr_le;
  	f_ctl = cpu_to_le32(F_CTL_EXCH_CONTEXT_RESP |
  	    F_CTL_LAST_SEQ | F_CTL_END_SEQ |
  	    F_CTL_SEQ_INITIATIVE);
  	p = (uint8_t *)&f_ctl;
  	resp->fcp_hdr_le.f_ctl[0] = *p++;
  	resp->fcp_hdr_le.f_ctl[1] = *p++;
  	resp->fcp_hdr_le.f_ctl[2] = *p;
  
  	resp->fcp_hdr_le.d_id = abts->fcp_hdr_le.s_id;
  	resp->fcp_hdr_le.s_id = abts->fcp_hdr_le.d_id;
  
  	resp->exchange_addr_to_abort = abts->exchange_addr_to_abort;
  	if (mcmd->fc_tm_rsp == FCP_TMF_CMPL) {
  		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_ACC;
  		resp->payload.ba_acct.seq_id_valid = SEQ_ID_INVALID;
  		resp->payload.ba_acct.low_seq_cnt = 0x0000;
  		resp->payload.ba_acct.high_seq_cnt = 0xFFFF;
  		resp->payload.ba_acct.ox_id = abts->fcp_hdr_le.ox_id;
  		resp->payload.ba_acct.rx_id = abts->fcp_hdr_le.rx_id;
  	} else {
  		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_RJT;
  		resp->payload.ba_rjt.reason_code =
  			BA_RJT_REASON_CODE_UNABLE_TO_PERFORM;
  		/* Other bytes are zero */
  	}
  
  	vha->vha_tgt.qla_tgt->abts_resp_expected++;
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  
  	return rc;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_24xx_send_abts_resp(struct qla_qpair *qpair,
  	struct abts_recv_from_24xx *abts, uint32_t status,
  	bool ids_reversed)
  {
  	struct scsi_qla_host *vha = qpair->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct abts_resp_to_24xx *resp;
  	uint32_t f_ctl;
  	uint8_t *p;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe006,
  	    "Sending task mgmt ABTS response (ha=%p, atio=%p, status=%x\n",
  	    ha, abts, status);
  
  	resp = (struct abts_resp_to_24xx *)qla2x00_alloc_iocbs_ready(qpair,
  	    NULL);
  	if (!resp) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe04a,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet", vha->vp_idx, __func__);
  		return;
  	}
  
  	resp->entry_type = ABTS_RESP_24XX;
  	resp->handle = QLA_TGT_SKIP_HANDLE;
  	resp->entry_count = 1;
  	resp->nport_handle = abts->nport_handle;
  	resp->vp_index = vha->vp_idx;
  	resp->sof_type = abts->sof_type;
  	resp->exchange_address = abts->exchange_address;
  	resp->fcp_hdr_le = abts->fcp_hdr_le;
  	f_ctl = cpu_to_le32(F_CTL_EXCH_CONTEXT_RESP |
  	    F_CTL_LAST_SEQ | F_CTL_END_SEQ |
  	    F_CTL_SEQ_INITIATIVE);
  	p = (uint8_t *)&f_ctl;
  	resp->fcp_hdr_le.f_ctl[0] = *p++;
  	resp->fcp_hdr_le.f_ctl[1] = *p++;
  	resp->fcp_hdr_le.f_ctl[2] = *p;
  	if (ids_reversed) {
  		resp->fcp_hdr_le.d_id = abts->fcp_hdr_le.d_id;
  		resp->fcp_hdr_le.s_id = abts->fcp_hdr_le.s_id;
  	} else {
  		resp->fcp_hdr_le.d_id = abts->fcp_hdr_le.s_id;
  		resp->fcp_hdr_le.s_id = abts->fcp_hdr_le.d_id;
  	}
  	resp->exchange_addr_to_abort = abts->exchange_addr_to_abort;
  	if (status == FCP_TMF_CMPL) {
  		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_ACC;
  		resp->payload.ba_acct.seq_id_valid = SEQ_ID_INVALID;
  		resp->payload.ba_acct.low_seq_cnt = 0x0000;
  		resp->payload.ba_acct.high_seq_cnt = 0xFFFF;
  		resp->payload.ba_acct.ox_id = abts->fcp_hdr_le.ox_id;
  		resp->payload.ba_acct.rx_id = abts->fcp_hdr_le.rx_id;
  	} else {
  		resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_RJT;
  		resp->payload.ba_rjt.reason_code =
  			BA_RJT_REASON_CODE_UNABLE_TO_PERFORM;
  		/* Other bytes are zero */
  	}
  
  	vha->vha_tgt.qla_tgt->abts_resp_expected++;
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_24xx_retry_term_exchange(struct scsi_qla_host *vha,
      struct qla_qpair *qpair, response_t *pkt, struct qla_tgt_mgmt_cmd *mcmd)
  {
  	struct ctio7_to_24xx *ctio;
  	u16 tmp;
  	struct abts_recv_from_24xx *entry;
  
  	ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs_ready(qpair, NULL);
  	if (ctio == NULL) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe04b,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet\n", vha->vp_idx, __func__);
  		return;
  	}
  
  	if (mcmd)
  		/* abts from remote port */
  		entry = &mcmd->orig_iocb.abts;
  	else
  		/* abts from this driver.  */
  		entry = (struct abts_recv_from_24xx *)pkt;
  
  	/*
  	 * We've got on entrance firmware's response on by us generated
  	 * ABTS response. So, in it ID fields are reversed.
  	 */
  
  	ctio->entry_type = CTIO_TYPE7;
  	ctio->entry_count = 1;
  	ctio->nport_handle = entry->nport_handle;
  	ctio->handle = QLA_TGT_SKIP_HANDLE |	CTIO_COMPLETION_HANDLE_MARK;
  	ctio->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	ctio->vp_index = vha->vp_idx;
  	ctio->exchange_addr = entry->exchange_addr_to_abort;
  	tmp = (CTIO7_FLAGS_STATUS_MODE_1 | CTIO7_FLAGS_TERMINATE);
  
  	if (mcmd) {
  		ctio->initiator_id = entry->fcp_hdr_le.s_id;
  
  		if (mcmd->flags & QLA24XX_MGMT_ABORT_IO_ATTR_VALID)
  			tmp |= (mcmd->abort_io_attr << 9);
  		else if (qpair->retry_term_cnt & 1)
  			tmp |= (0x4 << 9);
  	} else {
  		ctio->initiator_id = entry->fcp_hdr_le.d_id;
  
  		if (qpair->retry_term_cnt & 1)
  			tmp |= (0x4 << 9);
  	}
  	ctio->u.status1.flags = cpu_to_le16(tmp);
  	ctio->u.status1.ox_id = entry->fcp_hdr_le.ox_id;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe007,
  	    "Sending retry TERM EXCH CTIO7 flags %04xh oxid %04xh attr valid %x\n",
  	    le16_to_cpu(ctio->u.status1.flags),
  	    le16_to_cpu(ctio->u.status1.ox_id),
  	    (mcmd && mcmd->flags & QLA24XX_MGMT_ABORT_IO_ATTR_VALID) ? 1 : 0);
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  
  	if (mcmd)
  		qlt_build_abts_resp_iocb(mcmd);
  	else
  		qlt_24xx_send_abts_resp(qpair,
  		    (struct abts_recv_from_24xx *)entry, FCP_TMF_CMPL, true);
  
  }
  
  /* drop cmds for the given lun
   * XXX only looks for cmds on the port through which lun reset was recieved
   * XXX does not go through the list of other port (which may have cmds
   *     for the same lun)
   */
  static void abort_cmds_for_lun(struct scsi_qla_host *vha, u64 lun, be_id_t s_id)
  {
  	struct qla_tgt_sess_op *op;
  	struct qla_tgt_cmd *cmd;
  	uint32_t key;
  	unsigned long flags;
  
  	key = sid_to_key(s_id);
  	spin_lock_irqsave(&vha->cmd_list_lock, flags);
  	list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
  		uint32_t op_key;
  		u64 op_lun;
  
  		op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
  		op_lun = scsilun_to_int(
  			(struct scsi_lun *)&op->atio.u.isp24.fcp_cmnd.lun);
  		if (op_key == key && op_lun == lun)
  			op->aborted = true;
  	}
  
  	list_for_each_entry(op, &vha->unknown_atio_list, cmd_list) {
  		uint32_t op_key;
  		u64 op_lun;
  
  		op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
  		op_lun = scsilun_to_int(
  			(struct scsi_lun *)&op->atio.u.isp24.fcp_cmnd.lun);
  		if (op_key == key && op_lun == lun)
  			op->aborted = true;
  	}
  
  	list_for_each_entry(cmd, &vha->qla_cmd_list, cmd_list) {
  		uint32_t cmd_key;
  		u64 cmd_lun;
  
  		cmd_key = sid_to_key(cmd->atio.u.isp24.fcp_hdr.s_id);
  		cmd_lun = scsilun_to_int(
  			(struct scsi_lun *)&cmd->atio.u.isp24.fcp_cmnd.lun);
  		if (cmd_key == key && cmd_lun == lun)
  			cmd->aborted = 1;
  	}
  	spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  }
  
  static struct qla_qpair_hint *qlt_find_qphint(struct scsi_qla_host *vha,
      uint64_t unpacked_lun)
  {
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct qla_qpair_hint *h = NULL;
  
  	if (vha->flags.qpairs_available) {
  		h = btree_lookup64(&tgt->lun_qpair_map, unpacked_lun);
  		if (!h)
  			h = &tgt->qphints[0];
  	} else {
  		h = &tgt->qphints[0];
  	}
  
  	return h;
  }
  
  static void qlt_do_tmr_work(struct work_struct *work)
  {
  	struct qla_tgt_mgmt_cmd *mcmd =
  		container_of(work, struct qla_tgt_mgmt_cmd, work);
  	struct qla_hw_data *ha = mcmd->vha->hw;
  	int rc = EIO;
  	uint32_t tag;
  	unsigned long flags;
  
  	switch (mcmd->tmr_func) {
  	case QLA_TGT_ABTS:
  		tag = mcmd->orig_iocb.abts.exchange_addr_to_abort;
  		break;
  	default:
  		tag = 0;
  		break;
  	}
  
  	rc = ha->tgt.tgt_ops->handle_tmr(mcmd, mcmd->unpacked_lun,
  	    mcmd->tmr_func, tag);
  
  	if (rc != 0) {
  		spin_lock_irqsave(mcmd->qpair->qp_lock_ptr, flags);
  		switch (mcmd->tmr_func) {
  		case QLA_TGT_ABTS:
  			mcmd->fc_tm_rsp = FCP_TMF_REJECTED;
  			qlt_build_abts_resp_iocb(mcmd);
  			break;
  		case QLA_TGT_LUN_RESET:
  		case QLA_TGT_CLEAR_TS:
  		case QLA_TGT_ABORT_TS:
  		case QLA_TGT_CLEAR_ACA:
  		case QLA_TGT_TARGET_RESET:
  			qlt_send_busy(mcmd->qpair, &mcmd->orig_iocb.atio,
  			    qla_sam_status);
  			break;
  
  		case QLA_TGT_ABORT_ALL:
  		case QLA_TGT_NEXUS_LOSS_SESS:
  		case QLA_TGT_NEXUS_LOSS:
  			qlt_send_notify_ack(mcmd->qpair,
  			    &mcmd->orig_iocb.imm_ntfy, 0, 0, 0, 0, 0, 0);
  			break;
  		}
  		spin_unlock_irqrestore(mcmd->qpair->qp_lock_ptr, flags);
  
  		ql_dbg(ql_dbg_tgt_mgt, mcmd->vha, 0xf052,
  		    "qla_target(%d):  tgt_ops->handle_tmr() failed: %d\n",
  		    mcmd->vha->vp_idx, rc);
  		mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
  	}
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int __qlt_24xx_handle_abts(struct scsi_qla_host *vha,
  	struct abts_recv_from_24xx *abts, struct fc_port *sess)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt_mgmt_cmd *mcmd;
  	struct qla_qpair_hint *h = &vha->vha_tgt.qla_tgt->qphints[0];
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00f,
  	    "qla_target(%d): task abort (tag=%d)\n",
  	    vha->vp_idx, abts->exchange_addr_to_abort);
  
  	mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
  	if (mcmd == NULL) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf051,
  		    "qla_target(%d): %s: Allocation of ABORT cmd failed",
  		    vha->vp_idx, __func__);
  		return -ENOMEM;
  	}
  	memset(mcmd, 0, sizeof(*mcmd));
  	mcmd->cmd_type = TYPE_TGT_TMCMD;
  	mcmd->sess = sess;
  	memcpy(&mcmd->orig_iocb.abts, abts, sizeof(mcmd->orig_iocb.abts));
  	mcmd->reset_count = ha->base_qpair->chip_reset;
  	mcmd->tmr_func = QLA_TGT_ABTS;
  	mcmd->qpair = h->qpair;
  	mcmd->vha = vha;
  
  	/*
  	 * LUN is looked up by target-core internally based on the passed
  	 * abts->exchange_addr_to_abort tag.
  	 */
  	mcmd->se_cmd.cpuid = h->cpuid;
  
  	if (ha->tgt.tgt_ops->find_cmd_by_tag) {
  		struct qla_tgt_cmd *abort_cmd;
  
  		abort_cmd = ha->tgt.tgt_ops->find_cmd_by_tag(sess,
  		    abts->exchange_addr_to_abort);
  		if (abort_cmd && abort_cmd->qpair) {
  			mcmd->qpair = abort_cmd->qpair;
  			mcmd->se_cmd.cpuid = abort_cmd->se_cmd.cpuid;
  			mcmd->abort_io_attr = abort_cmd->atio.u.isp24.attr;
  			mcmd->flags = QLA24XX_MGMT_ABORT_IO_ATTR_VALID;
  		}
  	}
  
  	INIT_WORK(&mcmd->work, qlt_do_tmr_work);
  	queue_work_on(mcmd->se_cmd.cpuid, qla_tgt_wq, &mcmd->work);
  
  	return 0;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_24xx_handle_abts(struct scsi_qla_host *vha,
  	struct abts_recv_from_24xx *abts)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess;
  	uint32_t tag = abts->exchange_addr_to_abort;
  	be_id_t s_id;
  	int rc;
  	unsigned long flags;
  
  	if (le32_to_cpu(abts->fcp_hdr_le.parameter) & ABTS_PARAM_ABORT_SEQ) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf053,
  		    "qla_target(%d): ABTS: Abort Sequence not "
  		    "supported\n", vha->vp_idx);
  		qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
  		    false);
  		return;
  	}
  
  	if (tag == ATIO_EXCHANGE_ADDRESS_UNKNOWN) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf010,
  		    "qla_target(%d): ABTS: Unknown Exchange "
  		    "Address received\n", vha->vp_idx);
  		qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
  		    false);
  		return;
  	}
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf011,
  	    "qla_target(%d): task abort (s_id=%x:%x:%x, "
  	    "tag=%d, param=%x)\n", vha->vp_idx, abts->fcp_hdr_le.s_id.domain,
  	    abts->fcp_hdr_le.s_id.area, abts->fcp_hdr_le.s_id.al_pa, tag,
  	    le32_to_cpu(abts->fcp_hdr_le.parameter));
  
  	s_id = le_id_to_be(abts->fcp_hdr_le.s_id);
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
  	if (!sess) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf012,
  		    "qla_target(%d): task abort for non-existent session\n",
  		    vha->vp_idx);
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  		qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
  			    false);
  		return;
  	}
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  
  	if (sess->deleted) {
  		qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
  		    false);
  		return;
  	}
  
  	rc = __qlt_24xx_handle_abts(vha, abts, sess);
  	if (rc != 0) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf054,
  		    "qla_target(%d): __qlt_24xx_handle_abts() failed: %d\n",
  		    vha->vp_idx, rc);
  		qlt_24xx_send_abts_resp(ha->base_qpair, abts, FCP_TMF_REJECTED,
  		    false);
  		return;
  	}
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_24xx_send_task_mgmt_ctio(struct qla_qpair *qpair,
  	struct qla_tgt_mgmt_cmd *mcmd, uint32_t resp_code)
  {
  	struct scsi_qla_host *ha = mcmd->vha;
  	struct atio_from_isp *atio = &mcmd->orig_iocb.atio;
  	struct ctio7_to_24xx *ctio;
  	uint16_t temp;
  
  	ql_dbg(ql_dbg_tgt, ha, 0xe008,
  	    "Sending task mgmt CTIO7 (ha=%p, atio=%p, resp_code=%x\n",
  	    ha, atio, resp_code);
  
  
  	ctio = (struct ctio7_to_24xx *)__qla2x00_alloc_iocbs(qpair, NULL);
  	if (ctio == NULL) {
  		ql_dbg(ql_dbg_tgt, ha, 0xe04c,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet\n", ha->vp_idx, __func__);
  		return;
  	}
  
  	ctio->entry_type = CTIO_TYPE7;
  	ctio->entry_count = 1;
  	ctio->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
  	ctio->nport_handle = mcmd->sess->loop_id;
  	ctio->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	ctio->vp_index = ha->vp_idx;
  	ctio->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	ctio->exchange_addr = atio->u.isp24.exchange_addr;
  	temp = (atio->u.isp24.attr << 9)|
  		CTIO7_FLAGS_STATUS_MODE_1 | CTIO7_FLAGS_SEND_STATUS;
  	ctio->u.status1.flags = cpu_to_le16(temp);
  	temp = be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id);
  	ctio->u.status1.ox_id = cpu_to_le16(temp);
  	ctio->u.status1.scsi_status =
  	    cpu_to_le16(SS_RESPONSE_INFO_LEN_VALID);
  	ctio->u.status1.response_len = cpu_to_le16(8);
  	ctio->u.status1.sense_data[0] = resp_code;
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(ha, qpair->req);
  }
  
  void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
  {
  	mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
  }
  EXPORT_SYMBOL(qlt_free_mcmd);
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then
   * reacquire
   */
  void qlt_send_resp_ctio(struct qla_qpair *qpair, struct qla_tgt_cmd *cmd,
      uint8_t scsi_status, uint8_t sense_key, uint8_t asc, uint8_t ascq)
  {
  	struct atio_from_isp *atio = &cmd->atio;
  	struct ctio7_to_24xx *ctio;
  	uint16_t temp;
  	struct scsi_qla_host *vha = cmd->vha;
  
  	ql_dbg(ql_dbg_tgt_dif, vha, 0x3066,
  	    "Sending response CTIO7 (vha=%p, atio=%p, scsi_status=%02x, "
  	    "sense_key=%02x, asc=%02x, ascq=%02x",
  	    vha, atio, scsi_status, sense_key, asc, ascq);
  
  	ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs(vha, NULL);
  	if (!ctio) {
  		ql_dbg(ql_dbg_async, vha, 0x3067,
  		    "qla2x00t(%ld): %s failed: unable to allocate request packet",
  		    vha->host_no, __func__);
  		goto out;
  	}
  
  	ctio->entry_type = CTIO_TYPE7;
  	ctio->entry_count = 1;
  	ctio->handle = QLA_TGT_SKIP_HANDLE;
  	ctio->nport_handle = cmd->sess->loop_id;
  	ctio->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	ctio->vp_index = vha->vp_idx;
  	ctio->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	ctio->exchange_addr = atio->u.isp24.exchange_addr;
  	temp = (atio->u.isp24.attr << 9) |
  	    CTIO7_FLAGS_STATUS_MODE_1 | CTIO7_FLAGS_SEND_STATUS;
  	ctio->u.status1.flags = cpu_to_le16(temp);
  	temp = be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id);
  	ctio->u.status1.ox_id = cpu_to_le16(temp);
  	ctio->u.status1.scsi_status =
  	    cpu_to_le16(SS_RESPONSE_INFO_LEN_VALID | scsi_status);
  	ctio->u.status1.response_len = cpu_to_le16(18);
  	ctio->u.status1.residual = cpu_to_le32(get_datalen_for_atio(atio));
  
  	if (ctio->u.status1.residual != 0)
  		ctio->u.status1.scsi_status |=
  		    cpu_to_le16(SS_RESIDUAL_UNDER);
  
  	/* Fixed format sense data. */
  	ctio->u.status1.sense_data[0] = 0x70;
  	ctio->u.status1.sense_data[2] = sense_key;
  	/* Additional sense length */
  	ctio->u.status1.sense_data[7] = 0xa;
  	/* ASC and ASCQ */
  	ctio->u.status1.sense_data[12] = asc;
  	ctio->u.status1.sense_data[13] = ascq;
  
  	/* Memory Barrier */
  	wmb();
  
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  
  out:
  	return;
  }
  
  /* callback from target fabric module code */
  void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *mcmd)
  {
  	struct scsi_qla_host *vha = mcmd->sess->vha;
  	struct qla_hw_data *ha = vha->hw;
  	unsigned long flags;
  	struct qla_qpair *qpair = mcmd->qpair;
  	bool free_mcmd = true;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf013,
  	    "TM response mcmd (%p) status %#x state %#x",
  	    mcmd, mcmd->fc_tm_rsp, mcmd->flags);
  
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  
  	if (!vha->flags.online || mcmd->reset_count != qpair->chip_reset) {
  		/*
  		 * Either the port is not online or this request was from
  		 * previous life, just abort the processing.
  		 */
  		ql_dbg(ql_dbg_async, vha, 0xe100,
  			"RESET-TMR online/active/old-count/new-count = %d/%d/%d/%d.\n",
  			vha->flags.online, qla2x00_reset_active(vha),
  			mcmd->reset_count, qpair->chip_reset);
  		ha->tgt.tgt_ops->free_mcmd(mcmd);
  		spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  		return;
  	}
  
  	if (mcmd->flags == QLA24XX_MGMT_SEND_NACK) {
  		switch (mcmd->orig_iocb.imm_ntfy.u.isp24.status_subcode) {
  		case ELS_LOGO:
  		case ELS_PRLO:
  		case ELS_TPRLO:
  			ql_dbg(ql_dbg_disc, vha, 0x2106,
  			    "TM response logo %8phC status %#x state %#x",
  			    mcmd->sess->port_name, mcmd->fc_tm_rsp,
  			    mcmd->flags);
  			qlt_schedule_sess_for_deletion(mcmd->sess);
  			break;
  		default:
  			qlt_send_notify_ack(vha->hw->base_qpair,
  			    &mcmd->orig_iocb.imm_ntfy, 0, 0, 0, 0, 0, 0);
  			break;
  		}
  	} else {
  		if (mcmd->orig_iocb.atio.u.raw.entry_type == ABTS_RECV_24XX) {
  			qlt_build_abts_resp_iocb(mcmd);
  			free_mcmd = false;
  		} else
  			qlt_24xx_send_task_mgmt_ctio(qpair, mcmd,
  			    mcmd->fc_tm_rsp);
  	}
  	/*
  	 * Make the callback for ->free_mcmd() to queue_work() and invoke
  	 * target_put_sess_cmd() to drop cmd_kref to 1.  The final
  	 * target_put_sess_cmd() call will be made from TFO->check_stop_free()
  	 * -> tcm_qla2xxx_check_stop_free() to release the TMR associated se_cmd
  	 * descriptor after TFO->queue_tm_rsp() -> tcm_qla2xxx_queue_tm_rsp() ->
  	 * qlt_xmit_tm_rsp() returns here..
  	 */
  	if (free_mcmd)
  		ha->tgt.tgt_ops->free_mcmd(mcmd);
  
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  }
  EXPORT_SYMBOL(qlt_xmit_tm_rsp);
  
  /* No locks */
  static int qlt_pci_map_calc_cnt(struct qla_tgt_prm *prm)
  {
  	struct qla_tgt_cmd *cmd = prm->cmd;
  
  	BUG_ON(cmd->sg_cnt == 0);
  
  	prm->sg = (struct scatterlist *)cmd->sg;
  	prm->seg_cnt = dma_map_sg(&cmd->qpair->pdev->dev, cmd->sg,
  	    cmd->sg_cnt, cmd->dma_data_direction);
  	if (unlikely(prm->seg_cnt == 0))
  		goto out_err;
  
  	prm->cmd->sg_mapped = 1;
  
  	if (cmd->se_cmd.prot_op == TARGET_PROT_NORMAL) {
  		/*
  		 * If greater than four sg entries then we need to allocate
  		 * the continuation entries
  		 */
  		if (prm->seg_cnt > QLA_TGT_DATASEGS_PER_CMD_24XX)
  			prm->req_cnt += DIV_ROUND_UP(prm->seg_cnt -
  			QLA_TGT_DATASEGS_PER_CMD_24XX,
  			QLA_TGT_DATASEGS_PER_CONT_24XX);
  	} else {
  		/* DIF */
  		if ((cmd->se_cmd.prot_op == TARGET_PROT_DIN_INSERT) ||
  		    (cmd->se_cmd.prot_op == TARGET_PROT_DOUT_STRIP)) {
  			prm->seg_cnt = DIV_ROUND_UP(cmd->bufflen, cmd->blk_sz);
  			prm->tot_dsds = prm->seg_cnt;
  		} else
  			prm->tot_dsds = prm->seg_cnt;
  
  		if (cmd->prot_sg_cnt) {
  			prm->prot_sg      = cmd->prot_sg;
  			prm->prot_seg_cnt = dma_map_sg(&cmd->qpair->pdev->dev,
  				cmd->prot_sg, cmd->prot_sg_cnt,
  				cmd->dma_data_direction);
  			if (unlikely(prm->prot_seg_cnt == 0))
  				goto out_err;
  
  			if ((cmd->se_cmd.prot_op == TARGET_PROT_DIN_INSERT) ||
  			    (cmd->se_cmd.prot_op == TARGET_PROT_DOUT_STRIP)) {
  				/* Dif Bundling not support here */
  				prm->prot_seg_cnt = DIV_ROUND_UP(cmd->bufflen,
  								cmd->blk_sz);
  				prm->tot_dsds += prm->prot_seg_cnt;
  			} else
  				prm->tot_dsds += prm->prot_seg_cnt;
  		}
  	}
  
  	return 0;
  
  out_err:
  	ql_dbg_qp(ql_dbg_tgt, prm->cmd->qpair, 0xe04d,
  	    "qla_target(%d): PCI mapping failed: sg_cnt=%d",
  	    0, prm->cmd->sg_cnt);
  	return -1;
  }
  
  static void qlt_unmap_sg(struct scsi_qla_host *vha, struct qla_tgt_cmd *cmd)
  {
  	struct qla_hw_data *ha;
  	struct qla_qpair *qpair;
  
  	if (!cmd->sg_mapped)
  		return;
  
  	qpair = cmd->qpair;
  
  	dma_unmap_sg(&qpair->pdev->dev, cmd->sg, cmd->sg_cnt,
  	    cmd->dma_data_direction);
  	cmd->sg_mapped = 0;
  
  	if (cmd->prot_sg_cnt)
  		dma_unmap_sg(&qpair->pdev->dev, cmd->prot_sg, cmd->prot_sg_cnt,
  			cmd->dma_data_direction);
  
  	if (!cmd->ctx)
  		return;
  	ha = vha->hw;
  	if (cmd->ctx_dsd_alloced)
  		qla2x00_clean_dsd_pool(ha, cmd->ctx);
  
  	dma_pool_free(ha->dl_dma_pool, cmd->ctx, cmd->ctx->crc_ctx_dma);
  }
  
  static int qlt_check_reserve_free_req(struct qla_qpair *qpair,
  	uint32_t req_cnt)
  {
  	uint32_t cnt;
  	struct req_que *req = qpair->req;
  
  	if (req->cnt < (req_cnt + 2)) {
  		cnt = (uint16_t)(qpair->use_shadow_reg ? *req->out_ptr :
  		    RD_REG_DWORD_RELAXED(req->req_q_out));
  
  		if  (req->ring_index < cnt)
  			req->cnt = cnt - req->ring_index;
  		else
  			req->cnt = req->length - (req->ring_index - cnt);
  
  		if (unlikely(req->cnt < (req_cnt + 2)))
  			return -EAGAIN;
  	}
  
  	req->cnt -= req_cnt;
  
  	return 0;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static inline void *qlt_get_req_pkt(struct req_que *req)
  {
  	/* Adjust ring index. */
  	req->ring_index++;
  	if (req->ring_index == req->length) {
  		req->ring_index = 0;
  		req->ring_ptr = req->ring;
  	} else {
  		req->ring_ptr++;
  	}
  	return (cont_entry_t *)req->ring_ptr;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static inline uint32_t qlt_make_handle(struct qla_qpair *qpair)
  {
  	uint32_t h;
  	int index;
  	uint8_t found = 0;
  	struct req_que *req = qpair->req;
  
  	h = req->current_outstanding_cmd;
  
  	for (index = 1; index < req->num_outstanding_cmds; index++) {
  		h++;
  		if (h == req->num_outstanding_cmds)
  			h = 1;
  
  		if (h == QLA_TGT_SKIP_HANDLE)
  			continue;
  
  		if (!req->outstanding_cmds[h]) {
  			found = 1;
  			break;
  		}
  	}
  
  	if (found) {
  		req->current_outstanding_cmd = h;
  	} else {
  		ql_dbg(ql_dbg_io, qpair->vha, 0x305b,
  		    "qla_target(%d): Ran out of empty cmd slots\n",
  		    qpair->vha->vp_idx);
  		h = QLA_TGT_NULL_HANDLE;
  	}
  
  	return h;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_24xx_build_ctio_pkt(struct qla_qpair *qpair,
  	struct qla_tgt_prm *prm)
  {
  	uint32_t h;
  	struct ctio7_to_24xx *pkt;
  	struct atio_from_isp *atio = &prm->cmd->atio;
  	uint16_t temp;
  
  	pkt = (struct ctio7_to_24xx *)qpair->req->ring_ptr;
  	prm->pkt = pkt;
  	memset(pkt, 0, sizeof(*pkt));
  
  	pkt->entry_type = CTIO_TYPE7;
  	pkt->entry_count = (uint8_t)prm->req_cnt;
  	pkt->vp_index = prm->cmd->vp_idx;
  
  	h = qlt_make_handle(qpair);
  	if (unlikely(h == QLA_TGT_NULL_HANDLE)) {
  		/*
  		 * CTIO type 7 from the firmware doesn't provide a way to
  		 * know the initiator's LOOP ID, hence we can't find
  		 * the session and, so, the command.
  		 */
  		return -EAGAIN;
  	} else
  		qpair->req->outstanding_cmds[h] = (srb_t *)prm->cmd;
  
  	pkt->handle = MAKE_HANDLE(qpair->req->id, h);
  	pkt->handle |= CTIO_COMPLETION_HANDLE_MARK;
  	pkt->nport_handle = cpu_to_le16(prm->cmd->loop_id);
  	pkt->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	pkt->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	pkt->exchange_addr = atio->u.isp24.exchange_addr;
  	temp = atio->u.isp24.attr << 9;
  	pkt->u.status0.flags |= cpu_to_le16(temp);
  	temp = be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id);
  	pkt->u.status0.ox_id = cpu_to_le16(temp);
  	pkt->u.status0.relative_offset = cpu_to_le32(prm->cmd->offset);
  
  	return 0;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. We have already made sure
   * that there is sufficient amount of request entries to not drop it.
   */
  static void qlt_load_cont_data_segments(struct qla_tgt_prm *prm)
  {
  	int cnt;
  	struct dsd64 *cur_dsd;
  
  	/* Build continuation packets */
  	while (prm->seg_cnt > 0) {
  		cont_a64_entry_t *cont_pkt64 =
  			(cont_a64_entry_t *)qlt_get_req_pkt(
  			   prm->cmd->qpair->req);
  
  		/*
  		 * Make sure that from cont_pkt64 none of
  		 * 64-bit specific fields used for 32-bit
  		 * addressing. Cast to (cont_entry_t *) for
  		 * that.
  		 */
  
  		memset(cont_pkt64, 0, sizeof(*cont_pkt64));
  
  		cont_pkt64->entry_count = 1;
  		cont_pkt64->sys_define = 0;
  
  		cont_pkt64->entry_type = CONTINUE_A64_TYPE;
  		cur_dsd = cont_pkt64->dsd;
  
  		/* Load continuation entry data segments */
  		for (cnt = 0;
  		    cnt < QLA_TGT_DATASEGS_PER_CONT_24XX && prm->seg_cnt;
  		    cnt++, prm->seg_cnt--) {
  			append_dsd64(&cur_dsd, prm->sg);
  			prm->sg = sg_next(prm->sg);
  		}
  	}
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. We have already made sure
   * that there is sufficient amount of request entries to not drop it.
   */
  static void qlt_load_data_segments(struct qla_tgt_prm *prm)
  {
  	int cnt;
  	struct dsd64 *cur_dsd;
  	struct ctio7_to_24xx *pkt24 = (struct ctio7_to_24xx *)prm->pkt;
  
  	pkt24->u.status0.transfer_length = cpu_to_le32(prm->cmd->bufflen);
  
  	/* Setup packet address segment pointer */
  	cur_dsd = &pkt24->u.status0.dsd;
  
  	/* Set total data segment count */
  	if (prm->seg_cnt)
  		pkt24->dseg_count = cpu_to_le16(prm->seg_cnt);
  
  	if (prm->seg_cnt == 0) {
  		/* No data transfer */
  		cur_dsd->address = 0;
  		cur_dsd->length = 0;
  		return;
  	}
  
  	/* If scatter gather */
  
  	/* Load command entry data segments */
  	for (cnt = 0;
  	    (cnt < QLA_TGT_DATASEGS_PER_CMD_24XX) && prm->seg_cnt;
  	    cnt++, prm->seg_cnt--) {
  		append_dsd64(&cur_dsd, prm->sg);
  		prm->sg = sg_next(prm->sg);
  	}
  
  	qlt_load_cont_data_segments(prm);
  }
  
  static inline int qlt_has_data(struct qla_tgt_cmd *cmd)
  {
  	return cmd->bufflen > 0;
  }
  
  static void qlt_print_dif_err(struct qla_tgt_prm *prm)
  {
  	struct qla_tgt_cmd *cmd;
  	struct scsi_qla_host *vha;
  
  	/* asc 0x10=dif error */
  	if (prm->sense_buffer && (prm->sense_buffer[12] == 0x10)) {
  		cmd = prm->cmd;
  		vha = cmd->vha;
  		/* ASCQ */
  		switch (prm->sense_buffer[13]) {
  		case 1:
  			ql_dbg(ql_dbg_tgt_dif, vha, 0xe00b,
  			    "BE detected Guard TAG ERR: lba[0x%llx|%lld] len[0x%x] "
  			    "se_cmd=%p tag[%x]",
  			    cmd->lba, cmd->lba, cmd->num_blks, &cmd->se_cmd,
  			    cmd->atio.u.isp24.exchange_addr);
  			break;
  		case 2:
  			ql_dbg(ql_dbg_tgt_dif, vha, 0xe00c,
  			    "BE detected APP TAG ERR: lba[0x%llx|%lld] len[0x%x] "
  			    "se_cmd=%p tag[%x]",
  			    cmd->lba, cmd->lba, cmd->num_blks, &cmd->se_cmd,
  			    cmd->atio.u.isp24.exchange_addr);
  			break;
  		case 3:
  			ql_dbg(ql_dbg_tgt_dif, vha, 0xe00f,
  			    "BE detected REF TAG ERR: lba[0x%llx|%lld] len[0x%x] "
  			    "se_cmd=%p tag[%x]",
  			    cmd->lba, cmd->lba, cmd->num_blks, &cmd->se_cmd,
  			    cmd->atio.u.isp24.exchange_addr);
  			break;
  		default:
  			ql_dbg(ql_dbg_tgt_dif, vha, 0xe010,
  			    "BE detected Dif ERR: lba[%llx|%lld] len[%x] "
  			    "se_cmd=%p tag[%x]",
  			    cmd->lba, cmd->lba, cmd->num_blks, &cmd->se_cmd,
  			    cmd->atio.u.isp24.exchange_addr);
  			break;
  		}
  		ql_dump_buffer(ql_dbg_tgt_dif, vha, 0xe011, cmd->cdb, 16);
  	}
  }
  
  /*
   * Called without ha->hardware_lock held
   */
  static int qlt_pre_xmit_response(struct qla_tgt_cmd *cmd,
  	struct qla_tgt_prm *prm, int xmit_type, uint8_t scsi_status,
  	uint32_t *full_req_cnt)
  {
  	struct se_cmd *se_cmd = &cmd->se_cmd;
  	struct qla_qpair *qpair = cmd->qpair;
  
  	prm->cmd = cmd;
  	prm->tgt = cmd->tgt;
  	prm->pkt = NULL;
  	prm->rq_result = scsi_status;
  	prm->sense_buffer = &cmd->sense_buffer[0];
  	prm->sense_buffer_len = TRANSPORT_SENSE_BUFFER;
  	prm->sg = NULL;
  	prm->seg_cnt = -1;
  	prm->req_cnt = 1;
  	prm->residual = 0;
  	prm->add_status_pkt = 0;
  	prm->prot_sg = NULL;
  	prm->prot_seg_cnt = 0;
  	prm->tot_dsds = 0;
  
  	if ((xmit_type & QLA_TGT_XMIT_DATA) && qlt_has_data(cmd)) {
  		if  (qlt_pci_map_calc_cnt(prm) != 0)
  			return -EAGAIN;
  	}
  
  	*full_req_cnt = prm->req_cnt;
  
  	if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
  		prm->residual = se_cmd->residual_count;
  		ql_dbg_qp(ql_dbg_io + ql_dbg_verbose, qpair, 0x305c,
  		    "Residual underflow: %d (tag %lld, op %x, bufflen %d, rq_result %x)\n",
  		       prm->residual, se_cmd->tag,
  		       se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
  		       cmd->bufflen, prm->rq_result);
  		prm->rq_result |= SS_RESIDUAL_UNDER;
  	} else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
  		prm->residual = se_cmd->residual_count;
  		ql_dbg_qp(ql_dbg_io, qpair, 0x305d,
  		    "Residual overflow: %d (tag %lld, op %x, bufflen %d, rq_result %x)\n",
  		       prm->residual, se_cmd->tag, se_cmd->t_task_cdb ?
  		       se_cmd->t_task_cdb[0] : 0, cmd->bufflen, prm->rq_result);
  		prm->rq_result |= SS_RESIDUAL_OVER;
  	}
  
  	if (xmit_type & QLA_TGT_XMIT_STATUS) {
  		/*
  		 * If QLA_TGT_XMIT_DATA is not set, add_status_pkt will be
  		 * ignored in *xmit_response() below
  		 */
  		if (qlt_has_data(cmd)) {
  			if (QLA_TGT_SENSE_VALID(prm->sense_buffer) ||
  			    (IS_FWI2_CAPABLE(cmd->vha->hw) &&
  			    (prm->rq_result != 0))) {
  				prm->add_status_pkt = 1;
  				(*full_req_cnt)++;
  			}
  		}
  	}
  
  	return 0;
  }
  
  static inline int qlt_need_explicit_conf(struct qla_tgt_cmd *cmd,
      int sending_sense)
  {
  	if (cmd->qpair->enable_class_2)
  		return 0;
  
  	if (sending_sense)
  		return cmd->conf_compl_supported;
  	else
  		return cmd->qpair->enable_explicit_conf &&
                      cmd->conf_compl_supported;
  }
  
  static void qlt_24xx_init_ctio_to_isp(struct ctio7_to_24xx *ctio,
  	struct qla_tgt_prm *prm)
  {
  	prm->sense_buffer_len = min_t(uint32_t, prm->sense_buffer_len,
  	    (uint32_t)sizeof(ctio->u.status1.sense_data));
  	ctio->u.status0.flags |= cpu_to_le16(CTIO7_FLAGS_SEND_STATUS);
  	if (qlt_need_explicit_conf(prm->cmd, 0)) {
  		ctio->u.status0.flags |= cpu_to_le16(
  		    CTIO7_FLAGS_EXPLICIT_CONFORM |
  		    CTIO7_FLAGS_CONFORM_REQ);
  	}
  	ctio->u.status0.residual = cpu_to_le32(prm->residual);
  	ctio->u.status0.scsi_status = cpu_to_le16(prm->rq_result);
  	if (QLA_TGT_SENSE_VALID(prm->sense_buffer)) {
  		int i;
  
  		if (qlt_need_explicit_conf(prm->cmd, 1)) {
  			if ((prm->rq_result & SS_SCSI_STATUS_BYTE) != 0) {
  				ql_dbg_qp(ql_dbg_tgt, prm->cmd->qpair, 0xe017,
  				    "Skipping EXPLICIT_CONFORM and "
  				    "CTIO7_FLAGS_CONFORM_REQ for FCP READ w/ "
  				    "non GOOD status\n");
  				goto skip_explict_conf;
  			}
  			ctio->u.status1.flags |= cpu_to_le16(
  			    CTIO7_FLAGS_EXPLICIT_CONFORM |
  			    CTIO7_FLAGS_CONFORM_REQ);
  		}
  skip_explict_conf:
  		ctio->u.status1.flags &=
  		    ~cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
  		ctio->u.status1.flags |=
  		    cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
  		ctio->u.status1.scsi_status |=
  		    cpu_to_le16(SS_SENSE_LEN_VALID);
  		ctio->u.status1.sense_length =
  		    cpu_to_le16(prm->sense_buffer_len);
  		for (i = 0; i < prm->sense_buffer_len/4; i++)
  			((uint32_t *)ctio->u.status1.sense_data)[i] =
  				cpu_to_be32(((uint32_t *)prm->sense_buffer)[i]);
  
  		qlt_print_dif_err(prm);
  
  	} else {
  		ctio->u.status1.flags &=
  		    ~cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
  		ctio->u.status1.flags |=
  		    cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
  		ctio->u.status1.sense_length = 0;
  		memset(ctio->u.status1.sense_data, 0,
  		    sizeof(ctio->u.status1.sense_data));
  	}
  
  	/* Sense with len > 24, is it possible ??? */
  }
  
  static inline int
  qlt_hba_err_chk_enabled(struct se_cmd *se_cmd)
  {
  	switch (se_cmd->prot_op) {
  	case TARGET_PROT_DOUT_INSERT:
  	case TARGET_PROT_DIN_STRIP:
  		if (ql2xenablehba_err_chk >= 1)
  			return 1;
  		break;
  	case TARGET_PROT_DOUT_PASS:
  	case TARGET_PROT_DIN_PASS:
  		if (ql2xenablehba_err_chk >= 2)
  			return 1;
  		break;
  	case TARGET_PROT_DIN_INSERT:
  	case TARGET_PROT_DOUT_STRIP:
  		return 1;
  	default:
  		break;
  	}
  	return 0;
  }
  
  static inline int
  qla_tgt_ref_mask_check(struct se_cmd *se_cmd)
  {
  	switch (se_cmd->prot_op) {
  	case TARGET_PROT_DIN_INSERT:
  	case TARGET_PROT_DOUT_INSERT:
  	case TARGET_PROT_DIN_STRIP:
  	case TARGET_PROT_DOUT_STRIP:
  	case TARGET_PROT_DIN_PASS:
  	case TARGET_PROT_DOUT_PASS:
  	    return 1;
  	default:
  	    return 0;
  	}
  	return 0;
  }
  
  /*
   * qla_tgt_set_dif_tags - Extract Ref and App tags from SCSI command
   */
  static void
  qla_tgt_set_dif_tags(struct qla_tgt_cmd *cmd, struct crc_context *ctx,
      uint16_t *pfw_prot_opts)
  {
  	struct se_cmd *se_cmd = &cmd->se_cmd;
  	uint32_t lba = 0xffffffff & se_cmd->t_task_lba;
  	scsi_qla_host_t *vha = cmd->tgt->vha;
  	struct qla_hw_data *ha = vha->hw;
  	uint32_t t32 = 0;
  
  	/*
  	 * wait till Mode Sense/Select cmd, modepage Ah, subpage 2
  	 * have been immplemented by TCM, before AppTag is avail.
  	 * Look for modesense_handlers[]
  	 */
  	ctx->app_tag = 0;
  	ctx->app_tag_mask[0] = 0x0;
  	ctx->app_tag_mask[1] = 0x0;
  
  	if (IS_PI_UNINIT_CAPABLE(ha)) {
  		if ((se_cmd->prot_type == TARGET_DIF_TYPE1_PROT) ||
  		    (se_cmd->prot_type == TARGET_DIF_TYPE2_PROT))
  			*pfw_prot_opts |= PO_DIS_VALD_APP_ESC;
  		else if (se_cmd->prot_type == TARGET_DIF_TYPE3_PROT)
  			*pfw_prot_opts |= PO_DIS_VALD_APP_REF_ESC;
  	}
  
  	t32 = ha->tgt.tgt_ops->get_dif_tags(cmd, pfw_prot_opts);
  
  	switch (se_cmd->prot_type) {
  	case TARGET_DIF_TYPE0_PROT:
  		/*
  		 * No check for ql2xenablehba_err_chk, as it
  		 * would be an I/O error if hba tag generation
  		 * is not done.
  		 */
  		ctx->ref_tag = cpu_to_le32(lba);
  		/* enable ALL bytes of the ref tag */
  		ctx->ref_tag_mask[0] = 0xff;
  		ctx->ref_tag_mask[1] = 0xff;
  		ctx->ref_tag_mask[2] = 0xff;
  		ctx->ref_tag_mask[3] = 0xff;
  		break;
  	case TARGET_DIF_TYPE1_PROT:
  	    /*
  	     * For TYPE 1 protection: 16 bit GUARD tag, 32 bit
  	     * REF tag, and 16 bit app tag.
  	     */
  	    ctx->ref_tag = cpu_to_le32(lba);
  	    if (!qla_tgt_ref_mask_check(se_cmd) ||
  		!(ha->tgt.tgt_ops->chk_dif_tags(t32))) {
  		    *pfw_prot_opts |= PO_DIS_REF_TAG_VALD;
  		    break;
  	    }
  	    /* enable ALL bytes of the ref tag */
  	    ctx->ref_tag_mask[0] = 0xff;
  	    ctx->ref_tag_mask[1] = 0xff;
  	    ctx->ref_tag_mask[2] = 0xff;
  	    ctx->ref_tag_mask[3] = 0xff;
  	    break;
  	case TARGET_DIF_TYPE2_PROT:
  	    /*
  	     * For TYPE 2 protection: 16 bit GUARD + 32 bit REF
  	     * tag has to match LBA in CDB + N
  	     */
  	    ctx->ref_tag = cpu_to_le32(lba);
  	    if (!qla_tgt_ref_mask_check(se_cmd) ||
  		!(ha->tgt.tgt_ops->chk_dif_tags(t32))) {
  		    *pfw_prot_opts |= PO_DIS_REF_TAG_VALD;
  		    break;
  	    }
  	    /* enable ALL bytes of the ref tag */
  	    ctx->ref_tag_mask[0] = 0xff;
  	    ctx->ref_tag_mask[1] = 0xff;
  	    ctx->ref_tag_mask[2] = 0xff;
  	    ctx->ref_tag_mask[3] = 0xff;
  	    break;
  	case TARGET_DIF_TYPE3_PROT:
  	    /* For TYPE 3 protection: 16 bit GUARD only */
  	    *pfw_prot_opts |= PO_DIS_REF_TAG_VALD;
  	    ctx->ref_tag_mask[0] = ctx->ref_tag_mask[1] =
  		ctx->ref_tag_mask[2] = ctx->ref_tag_mask[3] = 0x00;
  	    break;
  	}
  }
  
  static inline int
  qlt_build_ctio_crc2_pkt(struct qla_qpair *qpair, struct qla_tgt_prm *prm)
  {
  	struct dsd64		*cur_dsd;
  	uint32_t		transfer_length = 0;
  	uint32_t		data_bytes;
  	uint32_t		dif_bytes;
  	uint8_t			bundling = 1;
  	struct crc_context	*crc_ctx_pkt = NULL;
  	struct qla_hw_data	*ha;
  	struct ctio_crc2_to_fw	*pkt;
  	dma_addr_t		crc_ctx_dma;
  	uint16_t		fw_prot_opts = 0;
  	struct qla_tgt_cmd	*cmd = prm->cmd;
  	struct se_cmd		*se_cmd = &cmd->se_cmd;
  	uint32_t h;
  	struct atio_from_isp *atio = &prm->cmd->atio;
  	struct qla_tc_param	tc;
  	uint16_t t16;
  	scsi_qla_host_t *vha = cmd->vha;
  
  	ha = vha->hw;
  
  	pkt = (struct ctio_crc2_to_fw *)qpair->req->ring_ptr;
  	prm->pkt = pkt;
  	memset(pkt, 0, sizeof(*pkt));
  
  	ql_dbg_qp(ql_dbg_tgt, cmd->qpair, 0xe071,
  		"qla_target(%d):%s: se_cmd[%p] CRC2 prot_op[0x%x] cmd prot sg:cnt[%p:%x] lba[%llu]\n",
  		cmd->vp_idx, __func__, se_cmd, se_cmd->prot_op,
  		prm->prot_sg, prm->prot_seg_cnt, se_cmd->t_task_lba);
  
  	if ((se_cmd->prot_op == TARGET_PROT_DIN_INSERT) ||
  	    (se_cmd->prot_op == TARGET_PROT_DOUT_STRIP))
  		bundling = 0;
  
  	/* Compute dif len and adjust data len to incude protection */
  	data_bytes = cmd->bufflen;
  	dif_bytes  = (data_bytes / cmd->blk_sz) * 8;
  
  	switch (se_cmd->prot_op) {
  	case TARGET_PROT_DIN_INSERT:
  	case TARGET_PROT_DOUT_STRIP:
  		transfer_length = data_bytes;
  		if (cmd->prot_sg_cnt)
  			data_bytes += dif_bytes;
  		break;
  	case TARGET_PROT_DIN_STRIP:
  	case TARGET_PROT_DOUT_INSERT:
  	case TARGET_PROT_DIN_PASS:
  	case TARGET_PROT_DOUT_PASS:
  		transfer_length = data_bytes + dif_bytes;
  		break;
  	default:
  		BUG();
  		break;
  	}
  
  	if (!qlt_hba_err_chk_enabled(se_cmd))
  		fw_prot_opts |= 0x10; /* Disable Guard tag checking */
  	/* HBA error checking enabled */
  	else if (IS_PI_UNINIT_CAPABLE(ha)) {
  		if ((se_cmd->prot_type == TARGET_DIF_TYPE1_PROT) ||
  		    (se_cmd->prot_type == TARGET_DIF_TYPE2_PROT))
  			fw_prot_opts |= PO_DIS_VALD_APP_ESC;
  		else if (se_cmd->prot_type == TARGET_DIF_TYPE3_PROT)
  			fw_prot_opts |= PO_DIS_VALD_APP_REF_ESC;
  	}
  
  	switch (se_cmd->prot_op) {
  	case TARGET_PROT_DIN_INSERT:
  	case TARGET_PROT_DOUT_INSERT:
  		fw_prot_opts |= PO_MODE_DIF_INSERT;
  		break;
  	case TARGET_PROT_DIN_STRIP:
  	case TARGET_PROT_DOUT_STRIP:
  		fw_prot_opts |= PO_MODE_DIF_REMOVE;
  		break;
  	case TARGET_PROT_DIN_PASS:
  	case TARGET_PROT_DOUT_PASS:
  		fw_prot_opts |= PO_MODE_DIF_PASS;
  		/* FUTURE: does tcm require T10CRC<->IPCKSUM conversion? */
  		break;
  	default:/* Normal Request */
  		fw_prot_opts |= PO_MODE_DIF_PASS;
  		break;
  	}
  
  	/* ---- PKT ---- */
  	/* Update entry type to indicate Command Type CRC_2 IOCB */
  	pkt->entry_type  = CTIO_CRC2;
  	pkt->entry_count = 1;
  	pkt->vp_index = cmd->vp_idx;
  
  	h = qlt_make_handle(qpair);
  	if (unlikely(h == QLA_TGT_NULL_HANDLE)) {
  		/*
  		 * CTIO type 7 from the firmware doesn't provide a way to
  		 * know the initiator's LOOP ID, hence we can't find
  		 * the session and, so, the command.
  		 */
  		return -EAGAIN;
  	} else
  		qpair->req->outstanding_cmds[h] = (srb_t *)prm->cmd;
  
  	pkt->handle  = MAKE_HANDLE(qpair->req->id, h);
  	pkt->handle |= CTIO_COMPLETION_HANDLE_MARK;
  	pkt->nport_handle = cpu_to_le16(prm->cmd->loop_id);
  	pkt->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	pkt->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	pkt->exchange_addr   = atio->u.isp24.exchange_addr;
  
  	/* silence compile warning */
  	t16 = be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id);
  	pkt->ox_id  = cpu_to_le16(t16);
  
  	t16 = (atio->u.isp24.attr << 9);
  	pkt->flags |= cpu_to_le16(t16);
  	pkt->relative_offset = cpu_to_le32(prm->cmd->offset);
  
  	/* Set transfer direction */
  	if (cmd->dma_data_direction == DMA_TO_DEVICE)
  		pkt->flags = cpu_to_le16(CTIO7_FLAGS_DATA_IN);
  	else if (cmd->dma_data_direction == DMA_FROM_DEVICE)
  		pkt->flags = cpu_to_le16(CTIO7_FLAGS_DATA_OUT);
  
  	pkt->dseg_count = prm->tot_dsds;
  	/* Fibre channel byte count */
  	pkt->transfer_length = cpu_to_le32(transfer_length);
  
  	/* ----- CRC context -------- */
  
  	/* Allocate CRC context from global pool */
  	crc_ctx_pkt = cmd->ctx =
  	    dma_pool_zalloc(ha->dl_dma_pool, GFP_ATOMIC, &crc_ctx_dma);
  
  	if (!crc_ctx_pkt)
  		goto crc_queuing_error;
  
  	crc_ctx_pkt->crc_ctx_dma = crc_ctx_dma;
  	INIT_LIST_HEAD(&crc_ctx_pkt->dsd_list);
  
  	/* Set handle */
  	crc_ctx_pkt->handle = pkt->handle;
  
  	qla_tgt_set_dif_tags(cmd, crc_ctx_pkt, &fw_prot_opts);
  
  	put_unaligned_le64(crc_ctx_dma, &pkt->crc_context_address);
  	pkt->crc_context_len = CRC_CONTEXT_LEN_FW;
  
  	if (!bundling) {
  		cur_dsd = &crc_ctx_pkt->u.nobundling.data_dsd[0];
  	} else {
  		/*
  		 * Configure Bundling if we need to fetch interlaving
  		 * protection PCI accesses
  		 */
  		fw_prot_opts |= PO_ENABLE_DIF_BUNDLING;
  		crc_ctx_pkt->u.bundling.dif_byte_count = cpu_to_le32(dif_bytes);
  		crc_ctx_pkt->u.bundling.dseg_count =
  			cpu_to_le16(prm->tot_dsds - prm->prot_seg_cnt);
  		cur_dsd = &crc_ctx_pkt->u.bundling.data_dsd[0];
  	}
  
  	/* Finish the common fields of CRC pkt */
  	crc_ctx_pkt->blk_size   = cpu_to_le16(cmd->blk_sz);
  	crc_ctx_pkt->prot_opts  = cpu_to_le16(fw_prot_opts);
  	crc_ctx_pkt->byte_count = cpu_to_le32(data_bytes);
  	crc_ctx_pkt->guard_seed = cpu_to_le16(0);
  
  	memset((uint8_t *)&tc, 0 , sizeof(tc));
  	tc.vha = vha;
  	tc.blk_sz = cmd->blk_sz;
  	tc.bufflen = cmd->bufflen;
  	tc.sg = cmd->sg;
  	tc.prot_sg = cmd->prot_sg;
  	tc.ctx = crc_ctx_pkt;
  	tc.ctx_dsd_alloced = &cmd->ctx_dsd_alloced;
  
  	/* Walks data segments */
  	pkt->flags |= cpu_to_le16(CTIO7_FLAGS_DSD_PTR);
  
  	if (!bundling && prm->prot_seg_cnt) {
  		if (qla24xx_walk_and_build_sglist_no_difb(ha, NULL, cur_dsd,
  			prm->tot_dsds, &tc))
  			goto crc_queuing_error;
  	} else if (qla24xx_walk_and_build_sglist(ha, NULL, cur_dsd,
  		(prm->tot_dsds - prm->prot_seg_cnt), &tc))
  		goto crc_queuing_error;
  
  	if (bundling && prm->prot_seg_cnt) {
  		/* Walks dif segments */
  		pkt->add_flags |= CTIO_CRC2_AF_DIF_DSD_ENA;
  
  		cur_dsd = &crc_ctx_pkt->u.bundling.dif_dsd;
  		if (qla24xx_walk_and_build_prot_sglist(ha, NULL, cur_dsd,
  			prm->prot_seg_cnt, cmd))
  			goto crc_queuing_error;
  	}
  	return QLA_SUCCESS;
  
  crc_queuing_error:
  	/* Cleanup will be performed by the caller */
  	qpair->req->outstanding_cmds[h] = NULL;
  
  	return QLA_FUNCTION_FAILED;
  }
  
  /*
   * Callback to setup response of xmit_type of QLA_TGT_XMIT_DATA and *
   * QLA_TGT_XMIT_STATUS for >= 24xx silicon
   */
  int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
  	uint8_t scsi_status)
  {
  	struct scsi_qla_host *vha = cmd->vha;
  	struct qla_qpair *qpair = cmd->qpair;
  	struct ctio7_to_24xx *pkt;
  	struct qla_tgt_prm prm;
  	uint32_t full_req_cnt = 0;
  	unsigned long flags = 0;
  	int res;
  
  	if (!qpair->fw_started || (cmd->reset_count != qpair->chip_reset) ||
  	    (cmd->sess && cmd->sess->deleted)) {
  		cmd->state = QLA_TGT_STATE_PROCESSED;
  		res = 0;
  		goto free;
  	}
  
  	ql_dbg_qp(ql_dbg_tgt, qpair, 0xe018,
  	    "is_send_status=%d, cmd->bufflen=%d, cmd->sg_cnt=%d, cmd->dma_data_direction=%d se_cmd[%p] qp %d\n",
  	    (xmit_type & QLA_TGT_XMIT_STATUS) ?
  	    1 : 0, cmd->bufflen, cmd->sg_cnt, cmd->dma_data_direction,
  	    &cmd->se_cmd, qpair->id);
  
  	res = qlt_pre_xmit_response(cmd, &prm, xmit_type, scsi_status,
  	    &full_req_cnt);
  	if (unlikely(res != 0))
  		goto free;
  
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  
  	if (xmit_type == QLA_TGT_XMIT_STATUS)
  		qpair->tgt_counters.core_qla_snd_status++;
  	else
  		qpair->tgt_counters.core_qla_que_buf++;
  
  	if (!qpair->fw_started || cmd->reset_count != qpair->chip_reset) {
  		/*
  		 * Either the port is not online or this request was from
  		 * previous life, just abort the processing.
  		 */
  		cmd->state = QLA_TGT_STATE_PROCESSED;
  		ql_dbg_qp(ql_dbg_async, qpair, 0xe101,
  			"RESET-RSP online/active/old-count/new-count = %d/%d/%d/%d.\n",
  			vha->flags.online, qla2x00_reset_active(vha),
  			cmd->reset_count, qpair->chip_reset);
  		spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  		res = 0;
  		goto free;
  	}
  
  	/* Does F/W have an IOCBs for this request */
  	res = qlt_check_reserve_free_req(qpair, full_req_cnt);
  	if (unlikely(res))
  		goto out_unmap_unlock;
  
  	if (cmd->se_cmd.prot_op && (xmit_type & QLA_TGT_XMIT_DATA))
  		res = qlt_build_ctio_crc2_pkt(qpair, &prm);
  	else
  		res = qlt_24xx_build_ctio_pkt(qpair, &prm);
  	if (unlikely(res != 0)) {
  		qpair->req->cnt += full_req_cnt;
  		goto out_unmap_unlock;
  	}
  
  	pkt = (struct ctio7_to_24xx *)prm.pkt;
  
  	if (qlt_has_data(cmd) && (xmit_type & QLA_TGT_XMIT_DATA)) {
  		pkt->u.status0.flags |=
  		    cpu_to_le16(CTIO7_FLAGS_DATA_IN |
  			CTIO7_FLAGS_STATUS_MODE_0);
  
  		if (cmd->se_cmd.prot_op == TARGET_PROT_NORMAL)
  			qlt_load_data_segments(&prm);
  
  		if (prm.add_status_pkt == 0) {
  			if (xmit_type & QLA_TGT_XMIT_STATUS) {
  				pkt->u.status0.scsi_status =
  				    cpu_to_le16(prm.rq_result);
  				pkt->u.status0.residual =
  				    cpu_to_le32(prm.residual);
  				pkt->u.status0.flags |= cpu_to_le16(
  				    CTIO7_FLAGS_SEND_STATUS);
  				if (qlt_need_explicit_conf(cmd, 0)) {
  					pkt->u.status0.flags |=
  					    cpu_to_le16(
  						CTIO7_FLAGS_EXPLICIT_CONFORM |
  						CTIO7_FLAGS_CONFORM_REQ);
  				}
  			}
  
  		} else {
  			/*
  			 * We have already made sure that there is sufficient
  			 * amount of request entries to not drop HW lock in
  			 * req_pkt().
  			 */
  			struct ctio7_to_24xx *ctio =
  				(struct ctio7_to_24xx *)qlt_get_req_pkt(
  				    qpair->req);
  
  			ql_dbg_qp(ql_dbg_tgt, qpair, 0x305e,
  			    "Building additional status packet 0x%p.\n",
  			    ctio);
  
  			/*
  			 * T10Dif: ctio_crc2_to_fw overlay ontop of
  			 * ctio7_to_24xx
  			 */
  			memcpy(ctio, pkt, sizeof(*ctio));
  			/* reset back to CTIO7 */
  			ctio->entry_count = 1;
  			ctio->entry_type = CTIO_TYPE7;
  			ctio->dseg_count = 0;
  			ctio->u.status1.flags &= ~cpu_to_le16(
  			    CTIO7_FLAGS_DATA_IN);
  
  			/* Real finish is ctio_m1's finish */
  			pkt->handle |= CTIO_INTERMEDIATE_HANDLE_MARK;
  			pkt->u.status0.flags |= cpu_to_le16(
  			    CTIO7_FLAGS_DONT_RET_CTIO);
  
  			/* qlt_24xx_init_ctio_to_isp will correct
  			 * all neccessary fields that's part of CTIO7.
  			 * There should be no residual of CTIO-CRC2 data.
  			 */
  			qlt_24xx_init_ctio_to_isp((struct ctio7_to_24xx *)ctio,
  			    &prm);
  		}
  	} else
  		qlt_24xx_init_ctio_to_isp(pkt, &prm);
  
  
  	cmd->state = QLA_TGT_STATE_PROCESSED; /* Mid-level is done processing */
  	cmd->cmd_sent_to_fw = 1;
  	cmd->ctio_flags = le16_to_cpu(pkt->u.status0.flags);
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	return 0;
  
  out_unmap_unlock:
  	qlt_unmap_sg(vha, cmd);
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  free:
  	vha->hw->tgt.tgt_ops->free_cmd(cmd);
  	return res;
  }
  EXPORT_SYMBOL(qlt_xmit_response);
  
  int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
  {
  	struct ctio7_to_24xx *pkt;
  	struct scsi_qla_host *vha = cmd->vha;
  	struct qla_tgt *tgt = cmd->tgt;
  	struct qla_tgt_prm prm;
  	unsigned long flags = 0;
  	int res = 0;
  	struct qla_qpair *qpair = cmd->qpair;
  
  	memset(&prm, 0, sizeof(prm));
  	prm.cmd = cmd;
  	prm.tgt = tgt;
  	prm.sg = NULL;
  	prm.req_cnt = 1;
  
  	/* Calculate number of entries and segments required */
  	if (qlt_pci_map_calc_cnt(&prm) != 0)
  		return -EAGAIN;
  
  	if (!qpair->fw_started || (cmd->reset_count != qpair->chip_reset) ||
  	    (cmd->sess && cmd->sess->deleted)) {
  		/*
  		 * Either the port is not online or this request was from
  		 * previous life, just abort the processing.
  		 */
  		cmd->aborted = 1;
  		cmd->write_data_transferred = 0;
  		cmd->state = QLA_TGT_STATE_DATA_IN;
  		vha->hw->tgt.tgt_ops->handle_data(cmd);
  		ql_dbg_qp(ql_dbg_async, qpair, 0xe102,
  			"RESET-XFR online/active/old-count/new-count = %d/%d/%d/%d.\n",
  			vha->flags.online, qla2x00_reset_active(vha),
  			cmd->reset_count, qpair->chip_reset);
  		return 0;
  	}
  
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  	/* Does F/W have an IOCBs for this request */
  	res = qlt_check_reserve_free_req(qpair, prm.req_cnt);
  	if (res != 0)
  		goto out_unlock_free_unmap;
  	if (cmd->se_cmd.prot_op)
  		res = qlt_build_ctio_crc2_pkt(qpair, &prm);
  	else
  		res = qlt_24xx_build_ctio_pkt(qpair, &prm);
  
  	if (unlikely(res != 0)) {
  		qpair->req->cnt += prm.req_cnt;
  		goto out_unlock_free_unmap;
  	}
  
  	pkt = (struct ctio7_to_24xx *)prm.pkt;
  	pkt->u.status0.flags |= cpu_to_le16(CTIO7_FLAGS_DATA_OUT |
  	    CTIO7_FLAGS_STATUS_MODE_0);
  
  	if (cmd->se_cmd.prot_op == TARGET_PROT_NORMAL)
  		qlt_load_data_segments(&prm);
  
  	cmd->state = QLA_TGT_STATE_NEED_DATA;
  	cmd->cmd_sent_to_fw = 1;
  	cmd->ctio_flags = le16_to_cpu(pkt->u.status0.flags);
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	return res;
  
  out_unlock_free_unmap:
  	qlt_unmap_sg(vha, cmd);
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	return res;
  }
  EXPORT_SYMBOL(qlt_rdy_to_xfer);
  
  
  /*
   * it is assumed either hardware_lock or qpair lock is held.
   */
  static void
  qlt_handle_dif_error(struct qla_qpair *qpair, struct qla_tgt_cmd *cmd,
  	struct ctio_crc_from_fw *sts)
  {
  	uint8_t		*ap = &sts->actual_dif[0];
  	uint8_t		*ep = &sts->expected_dif[0];
  	uint64_t	lba = cmd->se_cmd.t_task_lba;
  	uint8_t scsi_status, sense_key, asc, ascq;
  	unsigned long flags;
  	struct scsi_qla_host *vha = cmd->vha;
  
  	cmd->trc_flags |= TRC_DIF_ERR;
  
  	cmd->a_guard   = be16_to_cpu(*(uint16_t *)(ap + 0));
  	cmd->a_app_tag = be16_to_cpu(*(uint16_t *)(ap + 2));
  	cmd->a_ref_tag = be32_to_cpu(*(uint32_t *)(ap + 4));
  
  	cmd->e_guard   = be16_to_cpu(*(uint16_t *)(ep + 0));
  	cmd->e_app_tag = be16_to_cpu(*(uint16_t *)(ep + 2));
  	cmd->e_ref_tag = be32_to_cpu(*(uint32_t *)(ep + 4));
  
  	ql_dbg(ql_dbg_tgt_dif, vha, 0xf075,
  	    "%s: aborted %d state %d\n", __func__, cmd->aborted, cmd->state);
  
  	scsi_status = sense_key = asc = ascq = 0;
  
  	/* check appl tag */
  	if (cmd->e_app_tag != cmd->a_app_tag) {
  		ql_dbg(ql_dbg_tgt_dif, vha, 0xe00d,
  		    "App Tag ERR: cdb[%x] lba[%llx %llx] blks[%x] [Actual|Expected] Ref[%x|%x], App[%x|%x], Guard [%x|%x] cmd=%p ox_id[%04x]",
  		    cmd->cdb[0], lba, (lba+cmd->num_blks), cmd->num_blks,
  		    cmd->a_ref_tag, cmd->e_ref_tag, cmd->a_app_tag,
  		    cmd->e_app_tag, cmd->a_guard, cmd->e_guard, cmd,
  		    cmd->atio.u.isp24.fcp_hdr.ox_id);
  
  		cmd->dif_err_code = DIF_ERR_APP;
  		scsi_status = SAM_STAT_CHECK_CONDITION;
  		sense_key = ABORTED_COMMAND;
  		asc = 0x10;
  		ascq = 0x2;
  	}
  
  	/* check ref tag */
  	if (cmd->e_ref_tag != cmd->a_ref_tag) {
  		ql_dbg(ql_dbg_tgt_dif, vha, 0xe00e,
  		    "Ref Tag ERR: cdb[%x] lba[%llx %llx] blks[%x] [Actual|Expected] Ref[%x|%x], App[%x|%x], Guard[%x|%x] cmd=%p ox_id[%04x] ",
  		    cmd->cdb[0], lba, (lba+cmd->num_blks), cmd->num_blks,
  		    cmd->a_ref_tag, cmd->e_ref_tag, cmd->a_app_tag,
  		    cmd->e_app_tag, cmd->a_guard, cmd->e_guard, cmd,
  		    cmd->atio.u.isp24.fcp_hdr.ox_id);
  
  		cmd->dif_err_code = DIF_ERR_REF;
  		scsi_status = SAM_STAT_CHECK_CONDITION;
  		sense_key = ABORTED_COMMAND;
  		asc = 0x10;
  		ascq = 0x3;
  		goto out;
  	}
  
  	/* check guard */
  	if (cmd->e_guard != cmd->a_guard) {
  		ql_dbg(ql_dbg_tgt_dif, vha, 0xe012,
  		    "Guard ERR: cdb[%x] lba[%llx %llx] blks[%x] [Actual|Expected] Ref[%x|%x], App[%x|%x], Guard [%x|%x] cmd=%p ox_id[%04x]",
  		    cmd->cdb[0], lba, (lba+cmd->num_blks), cmd->num_blks,
  		    cmd->a_ref_tag, cmd->e_ref_tag, cmd->a_app_tag,
  		    cmd->e_app_tag, cmd->a_guard, cmd->e_guard, cmd,
  		    cmd->atio.u.isp24.fcp_hdr.ox_id);
  
  		cmd->dif_err_code = DIF_ERR_GRD;
  		scsi_status = SAM_STAT_CHECK_CONDITION;
  		sense_key = ABORTED_COMMAND;
  		asc = 0x10;
  		ascq = 0x1;
  	}
  out:
  	switch (cmd->state) {
  	case QLA_TGT_STATE_NEED_DATA:
  		/* handle_data will load DIF error code  */
  		cmd->state = QLA_TGT_STATE_DATA_IN;
  		vha->hw->tgt.tgt_ops->handle_data(cmd);
  		break;
  	default:
  		spin_lock_irqsave(&cmd->cmd_lock, flags);
  		if (cmd->aborted) {
  			spin_unlock_irqrestore(&cmd->cmd_lock, flags);
  			vha->hw->tgt.tgt_ops->free_cmd(cmd);
  			break;
  		}
  		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
  
  		qlt_send_resp_ctio(qpair, cmd, scsi_status, sense_key, asc,
  		    ascq);
  		/* assume scsi status gets out on the wire.
  		 * Will not wait for completion.
  		 */
  		vha->hw->tgt.tgt_ops->free_cmd(cmd);
  		break;
  	}
  }
  
  /* If hardware_lock held on entry, might drop it, then reaquire */
  /* This function sends the appropriate CTIO to ISP 2xxx or 24xx */
  static int __qlt_send_term_imm_notif(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *ntfy)
  {
  	struct nack_to_isp *nack;
  	struct qla_hw_data *ha = vha->hw;
  	request_t *pkt;
  	int ret = 0;
  
  	ql_dbg(ql_dbg_tgt_tmr, vha, 0xe01c,
  	    "Sending TERM ELS CTIO (ha=%p)\n", ha);
  
  	pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
  	if (pkt == NULL) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe080,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet\n", vha->vp_idx, __func__);
  		return -ENOMEM;
  	}
  
  	pkt->entry_type = NOTIFY_ACK_TYPE;
  	pkt->entry_count = 1;
  	pkt->handle = QLA_TGT_SKIP_HANDLE;
  
  	nack = (struct nack_to_isp *)pkt;
  	nack->ox_id = ntfy->ox_id;
  
  	nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
  	if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
  		nack->u.isp24.flags = ntfy->u.isp24.flags &
  			__constant_cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
  	}
  
  	/* terminate */
  	nack->u.isp24.flags |=
  		__constant_cpu_to_le16(NOTIFY_ACK_FLAGS_TERMINATE);
  
  	nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
  	nack->u.isp24.status = ntfy->u.isp24.status;
  	nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
  	nack->u.isp24.fw_handle = ntfy->u.isp24.fw_handle;
  	nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
  	nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
  	nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
  	nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;
  
  	qla2x00_start_iocbs(vha, vha->req);
  	return ret;
  }
  
  static void qlt_send_term_imm_notif(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *imm, int ha_locked)
  {
  	int rc;
  
  	WARN_ON_ONCE(!ha_locked);
  	rc = __qlt_send_term_imm_notif(vha, imm);
  	pr_debug("rc = %d\n", rc);
  }
  
  /*
   * If hardware_lock held on entry, might drop it, then reaquire
   * This function sends the appropriate CTIO to ISP 2xxx or 24xx
   */
  static int __qlt_send_term_exchange(struct qla_qpair *qpair,
  	struct qla_tgt_cmd *cmd,
  	struct atio_from_isp *atio)
  {
  	struct scsi_qla_host *vha = qpair->vha;
  	struct ctio7_to_24xx *ctio24;
  	struct qla_hw_data *ha = vha->hw;
  	request_t *pkt;
  	int ret = 0;
  	uint16_t temp;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe009, "Sending TERM EXCH CTIO (ha=%p)\n", ha);
  
  	if (cmd)
  		vha = cmd->vha;
  
  	pkt = (request_t *)qla2x00_alloc_iocbs_ready(qpair, NULL);
  	if (pkt == NULL) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe050,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet\n", vha->vp_idx, __func__);
  		return -ENOMEM;
  	}
  
  	if (cmd != NULL) {
  		if (cmd->state < QLA_TGT_STATE_PROCESSED) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe051,
  			    "qla_target(%d): Terminating cmd %p with "
  			    "incorrect state %d\n", vha->vp_idx, cmd,
  			    cmd->state);
  		} else
  			ret = 1;
  	}
  
  	qpair->tgt_counters.num_term_xchg_sent++;
  	pkt->entry_count = 1;
  	pkt->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
  
  	ctio24 = (struct ctio7_to_24xx *)pkt;
  	ctio24->entry_type = CTIO_TYPE7;
  	ctio24->nport_handle = CTIO7_NHANDLE_UNRECOGNIZED;
  	ctio24->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	ctio24->vp_index = vha->vp_idx;
  	ctio24->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	ctio24->exchange_addr = atio->u.isp24.exchange_addr;
  	temp = (atio->u.isp24.attr << 9) | CTIO7_FLAGS_STATUS_MODE_1 |
  		CTIO7_FLAGS_TERMINATE;
  	ctio24->u.status1.flags = cpu_to_le16(temp);
  	temp = be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id);
  	ctio24->u.status1.ox_id = cpu_to_le16(temp);
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  	return ret;
  }
  
  static void qlt_send_term_exchange(struct qla_qpair *qpair,
  	struct qla_tgt_cmd *cmd, struct atio_from_isp *atio, int ha_locked,
  	int ul_abort)
  {
  	struct scsi_qla_host *vha;
  	unsigned long flags = 0;
  	int rc;
  
  	/* why use different vha? NPIV */
  	if (cmd)
  		vha = cmd->vha;
  	else
  		vha = qpair->vha;
  
  	if (ha_locked) {
  		rc = __qlt_send_term_exchange(qpair, cmd, atio);
  		if (rc == -ENOMEM)
  			qlt_alloc_qfull_cmd(vha, atio, 0, 0);
  		goto done;
  	}
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  	rc = __qlt_send_term_exchange(qpair, cmd, atio);
  	if (rc == -ENOMEM)
  		qlt_alloc_qfull_cmd(vha, atio, 0, 0);
  
  done:
  	if (cmd && !ul_abort && !cmd->aborted) {
  		if (cmd->sg_mapped)
  			qlt_unmap_sg(vha, cmd);
  		vha->hw->tgt.tgt_ops->free_cmd(cmd);
  	}
  
  	if (!ha_locked)
  		spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	return;
  }
  
  static void qlt_init_term_exchange(struct scsi_qla_host *vha)
  {
  	struct list_head free_list;
  	struct qla_tgt_cmd *cmd, *tcmd;
  
  	vha->hw->tgt.leak_exchg_thresh_hold =
  	    (vha->hw->cur_fw_xcb_count/100) * LEAK_EXCHG_THRESH_HOLD_PERCENT;
  
  	cmd = tcmd = NULL;
  	if (!list_empty(&vha->hw->tgt.q_full_list)) {
  		INIT_LIST_HEAD(&free_list);
  		list_splice_init(&vha->hw->tgt.q_full_list, &free_list);
  
  		list_for_each_entry_safe(cmd, tcmd, &free_list, cmd_list) {
  			list_del(&cmd->cmd_list);
  			/* This cmd was never sent to TCM.  There is no need
  			 * to schedule free or call free_cmd
  			 */
  			qlt_free_cmd(cmd);
  			vha->hw->tgt.num_qfull_cmds_alloc--;
  		}
  	}
  	vha->hw->tgt.num_qfull_cmds_dropped = 0;
  }
  
  static void qlt_chk_exch_leak_thresh_hold(struct scsi_qla_host *vha)
  {
  	uint32_t total_leaked;
  
  	total_leaked = vha->hw->tgt.num_qfull_cmds_dropped;
  
  	if (vha->hw->tgt.leak_exchg_thresh_hold &&
  	    (total_leaked > vha->hw->tgt.leak_exchg_thresh_hold)) {
  
  		ql_dbg(ql_dbg_tgt, vha, 0xe079,
  		    "Chip reset due to exchange starvation: %d/%d.\n",
  		    total_leaked, vha->hw->cur_fw_xcb_count);
  
  		if (IS_P3P_TYPE(vha->hw))
  			set_bit(FCOE_CTX_RESET_NEEDED, &vha->dpc_flags);
  		else
  			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
  		qla2xxx_wake_dpc(vha);
  	}
  
  }
  
  int qlt_abort_cmd(struct qla_tgt_cmd *cmd)
  {
  	struct qla_tgt *tgt = cmd->tgt;
  	struct scsi_qla_host *vha = tgt->vha;
  	struct se_cmd *se_cmd = &cmd->se_cmd;
  	unsigned long flags;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf014,
  	    "qla_target(%d): terminating exchange for aborted cmd=%p "
  	    "(se_cmd=%p, tag=%llu)", vha->vp_idx, cmd, &cmd->se_cmd,
  	    se_cmd->tag);
  
  	spin_lock_irqsave(&cmd->cmd_lock, flags);
  	if (cmd->aborted) {
  		spin_unlock_irqrestore(&cmd->cmd_lock, flags);
  		/*
  		 * It's normal to see 2 calls in this path:
  		 *  1) XFER Rdy completion + CMD_T_ABORT
  		 *  2) TCM TMR - drain_state_list
  		 */
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf016,
  		    "multiple abort. %p transport_state %x, t_state %x, "
  		    "se_cmd_flags %x\n", cmd, cmd->se_cmd.transport_state,
  		    cmd->se_cmd.t_state, cmd->se_cmd.se_cmd_flags);
  		return EIO;
  	}
  	cmd->aborted = 1;
  	cmd->trc_flags |= TRC_ABORT;
  	spin_unlock_irqrestore(&cmd->cmd_lock, flags);
  
  	qlt_send_term_exchange(cmd->qpair, cmd, &cmd->atio, 0, 1);
  	return 0;
  }
  EXPORT_SYMBOL(qlt_abort_cmd);
  
  void qlt_free_cmd(struct qla_tgt_cmd *cmd)
  {
  	struct fc_port *sess = cmd->sess;
  
  	ql_dbg(ql_dbg_tgt, cmd->vha, 0xe074,
  	    "%s: se_cmd[%p] ox_id %04x\n",
  	    __func__, &cmd->se_cmd,
  	    be16_to_cpu(cmd->atio.u.isp24.fcp_hdr.ox_id));
  
  	BUG_ON(cmd->cmd_in_wq);
  
  	if (cmd->sg_mapped)
  		qlt_unmap_sg(cmd->vha, cmd);
  
  	if (!cmd->q_full)
  		qlt_decr_num_pend_cmds(cmd->vha);
  
  	BUG_ON(cmd->sg_mapped);
  	cmd->jiffies_at_free = get_jiffies_64();
  	if (unlikely(cmd->free_sg))
  		kfree(cmd->sg);
  
  	if (!sess || !sess->se_sess) {
  		WARN_ON(1);
  		return;
  	}
  	cmd->jiffies_at_free = get_jiffies_64();
  	target_free_tag(sess->se_sess, &cmd->se_cmd);
  }
  EXPORT_SYMBOL(qlt_free_cmd);
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static int qlt_term_ctio_exchange(struct qla_qpair *qpair, void *ctio,
  	struct qla_tgt_cmd *cmd, uint32_t status)
  {
  	int term = 0;
  	struct scsi_qla_host *vha = qpair->vha;
  
  	if (cmd->se_cmd.prot_op)
  		ql_dbg(ql_dbg_tgt_dif, vha, 0xe013,
  		    "Term DIF cmd: lba[0x%llx|%lld] len[0x%x] "
  		    "se_cmd=%p tag[%x] op %#x/%s",
  		     cmd->lba, cmd->lba,
  		     cmd->num_blks, &cmd->se_cmd,
  		     cmd->atio.u.isp24.exchange_addr,
  		     cmd->se_cmd.prot_op,
  		     prot_op_str(cmd->se_cmd.prot_op));
  
  	if (ctio != NULL) {
  		struct ctio7_from_24xx *c = (struct ctio7_from_24xx *)ctio;
  
  		term = !(c->flags &
  		    cpu_to_le16(OF_TERM_EXCH));
  	} else
  		term = 1;
  
  	if (term)
  		qlt_send_term_exchange(qpair, cmd, &cmd->atio, 1, 0);
  
  	return term;
  }
  
  
  /* ha->hardware_lock supposed to be held on entry */
  static void *qlt_ctio_to_cmd(struct scsi_qla_host *vha,
  	struct rsp_que *rsp, uint32_t handle, void *ctio)
  {
  	void *cmd = NULL;
  	struct req_que *req;
  	int qid = GET_QID(handle);
  	uint32_t h = handle & ~QLA_TGT_HANDLE_MASK;
  
  	if (unlikely(h == QLA_TGT_SKIP_HANDLE))
  		return NULL;
  
  	if (qid == rsp->req->id) {
  		req = rsp->req;
  	} else if (vha->hw->req_q_map[qid]) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0x1000a,
  		    "qla_target(%d): CTIO completion with different QID %d handle %x\n",
  		    vha->vp_idx, rsp->id, handle);
  		req = vha->hw->req_q_map[qid];
  	} else {
  		return NULL;
  	}
  
  	h &= QLA_CMD_HANDLE_MASK;
  
  	if (h != QLA_TGT_NULL_HANDLE) {
  		if (unlikely(h >= req->num_outstanding_cmds)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe052,
  			    "qla_target(%d): Wrong handle %x received\n",
  			    vha->vp_idx, handle);
  			return NULL;
  		}
  
  		cmd = (void *) req->outstanding_cmds[h];
  		if (unlikely(cmd == NULL)) {
  			ql_dbg(ql_dbg_async, vha, 0xe053,
  			    "qla_target(%d): Suspicious: unable to find the command with handle %x req->id %d rsp->id %d\n",
  				vha->vp_idx, handle, req->id, rsp->id);
  			return NULL;
  		}
  		req->outstanding_cmds[h] = NULL;
  	} else if (ctio != NULL) {
  		/* We can't get loop ID from CTIO7 */
  		ql_dbg(ql_dbg_tgt, vha, 0xe054,
  		    "qla_target(%d): Wrong CTIO received: QLA24xx doesn't "
  		    "support NULL handles\n", vha->vp_idx);
  		return NULL;
  	}
  
  	return cmd;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_do_ctio_completion(struct scsi_qla_host *vha,
      struct rsp_que *rsp, uint32_t handle, uint32_t status, void *ctio)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct se_cmd *se_cmd;
  	struct qla_tgt_cmd *cmd;
  	struct qla_qpair *qpair = rsp->qpair;
  
  	if (handle & CTIO_INTERMEDIATE_HANDLE_MARK) {
  		/* That could happen only in case of an error/reset/abort */
  		if (status != CTIO_SUCCESS) {
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01d,
  			    "Intermediate CTIO received"
  			    " (status %x)\n", status);
  		}
  		return;
  	}
  
  	cmd = qlt_ctio_to_cmd(vha, rsp, handle, ctio);
  	if (cmd == NULL)
  		return;
  
  	se_cmd = &cmd->se_cmd;
  	cmd->cmd_sent_to_fw = 0;
  
  	qlt_unmap_sg(vha, cmd);
  
  	if (unlikely(status != CTIO_SUCCESS)) {
  		switch (status & 0xFFFF) {
  		case CTIO_INVALID_RX_ID:
  			if (printk_ratelimit())
  				dev_info(&vha->hw->pdev->dev,
  				    "qla_target(%d): CTIO with INVALID_RX_ID ATIO attr %x CTIO Flags %x|%x\n",
  				    vha->vp_idx, cmd->atio.u.isp24.attr,
  				    ((cmd->ctio_flags >> 9) & 0xf),
  				    cmd->ctio_flags);
  
  			break;
  		case CTIO_LIP_RESET:
  		case CTIO_TARGET_RESET:
  		case CTIO_ABORTED:
  			/* driver request abort via Terminate exchange */
  		case CTIO_TIMEOUT:
  			/* They are OK */
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf058,
  			    "qla_target(%d): CTIO with "
  			    "status %#x received, state %x, se_cmd %p, "
  			    "(LIP_RESET=e, ABORTED=2, TARGET_RESET=17, "
  			    "TIMEOUT=b, INVALID_RX_ID=8)\n", vha->vp_idx,
  			    status, cmd->state, se_cmd);
  			break;
  
  		case CTIO_PORT_LOGGED_OUT:
  		case CTIO_PORT_UNAVAILABLE:
  		{
  			int logged_out =
  				(status & 0xFFFF) == CTIO_PORT_LOGGED_OUT;
  
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf059,
  			    "qla_target(%d): CTIO with %s status %x "
  			    "received (state %x, se_cmd %p)\n", vha->vp_idx,
  			    logged_out ? "PORT LOGGED OUT" : "PORT UNAVAILABLE",
  			    status, cmd->state, se_cmd);
  
  			if (logged_out && cmd->sess) {
  				/*
  				 * Session is already logged out, but we need
  				 * to notify initiator, who's not aware of this
  				 */
  				cmd->sess->send_els_logo = 1;
  				ql_dbg(ql_dbg_disc, vha, 0x20f8,
  				    "%s %d %8phC post del sess\n",
  				    __func__, __LINE__, cmd->sess->port_name);
  
  				qlt_schedule_sess_for_deletion(cmd->sess);
  			}
  			break;
  		}
  		case CTIO_DIF_ERROR: {
  			struct ctio_crc_from_fw *crc =
  				(struct ctio_crc_from_fw *)ctio;
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf073,
  			    "qla_target(%d): CTIO with DIF_ERROR status %x "
  			    "received (state %x, ulp_cmd %p) actual_dif[0x%llx] "
  			    "expect_dif[0x%llx]\n",
  			    vha->vp_idx, status, cmd->state, se_cmd,
  			    *((u64 *)&crc->actual_dif[0]),
  			    *((u64 *)&crc->expected_dif[0]));
  
  			qlt_handle_dif_error(qpair, cmd, ctio);
  			return;
  		}
  		default:
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05b,
  			    "qla_target(%d): CTIO with error status 0x%x received (state %x, se_cmd %p\n",
  			    vha->vp_idx, status, cmd->state, se_cmd);
  			break;
  		}
  
  
  		/* "cmd->aborted" means
  		 * cmd is already aborted/terminated, we don't
  		 * need to terminate again.  The exchange is already
  		 * cleaned up/freed at FW level.  Just cleanup at driver
  		 * level.
  		 */
  		if ((cmd->state != QLA_TGT_STATE_NEED_DATA) &&
  		    (!cmd->aborted)) {
  			cmd->trc_flags |= TRC_CTIO_ERR;
  			if (qlt_term_ctio_exchange(qpair, ctio, cmd, status))
  				return;
  		}
  	}
  
  	if (cmd->state == QLA_TGT_STATE_PROCESSED) {
  		cmd->trc_flags |= TRC_CTIO_DONE;
  	} else if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
  		cmd->state = QLA_TGT_STATE_DATA_IN;
  
  		if (status == CTIO_SUCCESS)
  			cmd->write_data_transferred = 1;
  
  		ha->tgt.tgt_ops->handle_data(cmd);
  		return;
  	} else if (cmd->aborted) {
  		cmd->trc_flags |= TRC_CTIO_ABORTED;
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01e,
  		  "Aborted command %p (tag %lld) finished\n", cmd, se_cmd->tag);
  	} else {
  		cmd->trc_flags |= TRC_CTIO_STRANGE;
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05c,
  		    "qla_target(%d): A command in state (%d) should "
  		    "not return a CTIO complete\n", vha->vp_idx, cmd->state);
  	}
  
  	if (unlikely(status != CTIO_SUCCESS) &&
  		!cmd->aborted) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01f, "Finishing failed CTIO\n");
  		dump_stack();
  	}
  
  	ha->tgt.tgt_ops->free_cmd(cmd);
  }
  
  static inline int qlt_get_fcp_task_attr(struct scsi_qla_host *vha,
  	uint8_t task_codes)
  {
  	int fcp_task_attr;
  
  	switch (task_codes) {
  	case ATIO_SIMPLE_QUEUE:
  		fcp_task_attr = TCM_SIMPLE_TAG;
  		break;
  	case ATIO_HEAD_OF_QUEUE:
  		fcp_task_attr = TCM_HEAD_TAG;
  		break;
  	case ATIO_ORDERED_QUEUE:
  		fcp_task_attr = TCM_ORDERED_TAG;
  		break;
  	case ATIO_ACA_QUEUE:
  		fcp_task_attr = TCM_ACA_TAG;
  		break;
  	case ATIO_UNTAGGED:
  		fcp_task_attr = TCM_SIMPLE_TAG;
  		break;
  	default:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05d,
  		    "qla_target: unknown task code %x, use ORDERED instead\n",
  		    task_codes);
  		fcp_task_attr = TCM_ORDERED_TAG;
  		break;
  	}
  
  	return fcp_task_attr;
  }
  
  /*
   * Process context for I/O path into tcm_qla2xxx code
   */
  static void __qlt_do_work(struct qla_tgt_cmd *cmd)
  {
  	scsi_qla_host_t *vha = cmd->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess = cmd->sess;
  	struct atio_from_isp *atio = &cmd->atio;
  	unsigned char *cdb;
  	unsigned long flags;
  	uint32_t data_length;
  	int ret, fcp_task_attr, data_dir, bidi = 0;
  	struct qla_qpair *qpair = cmd->qpair;
  
  	cmd->cmd_in_wq = 0;
  	cmd->trc_flags |= TRC_DO_WORK;
  
  	if (cmd->aborted) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf082,
  		    "cmd with tag %u is aborted\n",
  		    cmd->atio.u.isp24.exchange_addr);
  		goto out_term;
  	}
  
  	spin_lock_init(&cmd->cmd_lock);
  	cdb = &atio->u.isp24.fcp_cmnd.cdb[0];
  	cmd->se_cmd.tag = atio->u.isp24.exchange_addr;
  
  	if (atio->u.isp24.fcp_cmnd.rddata &&
  	    atio->u.isp24.fcp_cmnd.wrdata) {
  		bidi = 1;
  		data_dir = DMA_TO_DEVICE;
  	} else if (atio->u.isp24.fcp_cmnd.rddata)
  		data_dir = DMA_FROM_DEVICE;
  	else if (atio->u.isp24.fcp_cmnd.wrdata)
  		data_dir = DMA_TO_DEVICE;
  	else
  		data_dir = DMA_NONE;
  
  	fcp_task_attr = qlt_get_fcp_task_attr(vha,
  	    atio->u.isp24.fcp_cmnd.task_attr);
  	data_length = get_datalen_for_atio(atio);
  
  	ret = ha->tgt.tgt_ops->handle_cmd(vha, cmd, cdb, data_length,
  				          fcp_task_attr, data_dir, bidi);
  	if (ret != 0)
  		goto out_term;
  	/*
  	 * Drop extra session reference from qlt_handle_cmd_for_atio().
  	 */
  	ha->tgt.tgt_ops->put_sess(sess);
  	return;
  
  out_term:
  	ql_dbg(ql_dbg_io, vha, 0x3060, "Terminating work cmd %p", cmd);
  	/*
  	 * cmd has not sent to target yet, so pass NULL as the second
  	 * argument to qlt_send_term_exchange() and free the memory here.
  	 */
  	cmd->trc_flags |= TRC_DO_WORK_ERR;
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  	qlt_send_term_exchange(qpair, NULL, &cmd->atio, 1, 0);
  
  	qlt_decr_num_pend_cmds(vha);
  	target_free_tag(sess->se_sess, &cmd->se_cmd);
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	ha->tgt.tgt_ops->put_sess(sess);
  }
  
  static void qlt_do_work(struct work_struct *work)
  {
  	struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
  	scsi_qla_host_t *vha = cmd->vha;
  	unsigned long flags;
  
  	spin_lock_irqsave(&vha->cmd_list_lock, flags);
  	list_del(&cmd->cmd_list);
  	spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  
  	__qlt_do_work(cmd);
  }
  
  void qlt_clr_qp_table(struct scsi_qla_host *vha)
  {
  	unsigned long flags;
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	void *node;
  	u64 key = 0;
  
  	ql_log(ql_log_info, vha, 0x706c,
  	    "User update Number of Active Qpairs %d\n",
  	    ha->tgt.num_act_qpairs);
  
  	spin_lock_irqsave(&ha->tgt.atio_lock, flags);
  
  	btree_for_each_safe64(&tgt->lun_qpair_map, key, node)
  		btree_remove64(&tgt->lun_qpair_map, key);
  
  	ha->base_qpair->lun_cnt = 0;
  	for (key = 0; key < ha->max_qpairs; key++)
  		if (ha->queue_pair_map[key])
  			ha->queue_pair_map[key]->lun_cnt = 0;
  
  	spin_unlock_irqrestore(&ha->tgt.atio_lock, flags);
  }
  
  static void qlt_assign_qpair(struct scsi_qla_host *vha,
  	struct qla_tgt_cmd *cmd)
  {
  	struct qla_qpair *qpair, *qp;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct qla_qpair_hint *h;
  
  	if (vha->flags.qpairs_available) {
  		h = btree_lookup64(&tgt->lun_qpair_map, cmd->unpacked_lun);
  		if (unlikely(!h)) {
  			/* spread lun to qpair ratio evently */
  			int lcnt = 0, rc;
  			struct scsi_qla_host *base_vha =
  				pci_get_drvdata(vha->hw->pdev);
  
  			qpair = vha->hw->base_qpair;
  			if (qpair->lun_cnt == 0) {
  				qpair->lun_cnt++;
  				h = qla_qpair_to_hint(tgt, qpair);
  				BUG_ON(!h);
  				rc = btree_insert64(&tgt->lun_qpair_map,
  					cmd->unpacked_lun, h, GFP_ATOMIC);
  				if (rc) {
  					qpair->lun_cnt--;
  					ql_log(ql_log_info, vha, 0xd037,
  					    "Unable to insert lun %llx into lun_qpair_map\n",
  					    cmd->unpacked_lun);
  				}
  				goto out;
  			} else {
  				lcnt = qpair->lun_cnt;
  			}
  
  			h = NULL;
  			list_for_each_entry(qp, &base_vha->qp_list,
  			    qp_list_elem) {
  				if (qp->lun_cnt == 0) {
  					qp->lun_cnt++;
  					h = qla_qpair_to_hint(tgt, qp);
  					BUG_ON(!h);
  					rc = btree_insert64(&tgt->lun_qpair_map,
  					    cmd->unpacked_lun, h, GFP_ATOMIC);
  					if (rc) {
  						qp->lun_cnt--;
  						ql_log(ql_log_info, vha, 0xd038,
  							"Unable to insert lun %llx into lun_qpair_map\n",
  							cmd->unpacked_lun);
  					}
  					qpair = qp;
  					goto out;
  				} else {
  					if (qp->lun_cnt < lcnt) {
  						lcnt = qp->lun_cnt;
  						qpair = qp;
  						continue;
  					}
  				}
  			}
  			BUG_ON(!qpair);
  			qpair->lun_cnt++;
  			h = qla_qpair_to_hint(tgt, qpair);
  			BUG_ON(!h);
  			rc = btree_insert64(&tgt->lun_qpair_map,
  				cmd->unpacked_lun, h, GFP_ATOMIC);
  			if (rc) {
  				qpair->lun_cnt--;
  				ql_log(ql_log_info, vha, 0xd039,
  				   "Unable to insert lun %llx into lun_qpair_map\n",
  				   cmd->unpacked_lun);
  			}
  		}
  	} else {
  		h = &tgt->qphints[0];
  	}
  out:
  	cmd->qpair = h->qpair;
  	cmd->se_cmd.cpuid = h->cpuid;
  }
  
  static struct qla_tgt_cmd *qlt_get_tag(scsi_qla_host_t *vha,
  				       struct fc_port *sess,
  				       struct atio_from_isp *atio)
  {
  	struct se_session *se_sess = sess->se_sess;
  	struct qla_tgt_cmd *cmd;
  	int tag, cpu;
  
  	tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
  	if (tag < 0)
  		return NULL;
  
  	cmd = &((struct qla_tgt_cmd *)se_sess->sess_cmd_map)[tag];
  	memset(cmd, 0, sizeof(struct qla_tgt_cmd));
  	cmd->cmd_type = TYPE_TGT_CMD;
  	memcpy(&cmd->atio, atio, sizeof(*atio));
  	cmd->state = QLA_TGT_STATE_NEW;
  	cmd->tgt = vha->vha_tgt.qla_tgt;
  	qlt_incr_num_pend_cmds(vha);
  	cmd->vha = vha;
  	cmd->se_cmd.map_tag = tag;
  	cmd->se_cmd.map_cpu = cpu;
  	cmd->sess = sess;
  	cmd->loop_id = sess->loop_id;
  	cmd->conf_compl_supported = sess->conf_compl_supported;
  
  	cmd->trc_flags = 0;
  	cmd->jiffies_at_alloc = get_jiffies_64();
  
  	cmd->unpacked_lun = scsilun_to_int(
  	    (struct scsi_lun *)&atio->u.isp24.fcp_cmnd.lun);
  	qlt_assign_qpair(vha, cmd);
  	cmd->reset_count = vha->hw->base_qpair->chip_reset;
  	cmd->vp_idx = vha->vp_idx;
  
  	return cmd;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
  	struct atio_from_isp *atio)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct fc_port *sess;
  	struct qla_tgt_cmd *cmd;
  	unsigned long flags;
  	port_id_t id;
  
  	if (unlikely(tgt->tgt_stop)) {
  		ql_dbg(ql_dbg_io, vha, 0x3061,
  		    "New command while device %p is shutting down\n", tgt);
  		return -ENODEV;
  	}
  
  	id = be_to_port_id(atio->u.isp24.fcp_hdr.s_id);
  	if (IS_SW_RESV_ADDR(id))
  		return -EBUSY;
  
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, atio->u.isp24.fcp_hdr.s_id);
  	if (unlikely(!sess))
  		return -EFAULT;
  
  	/* Another WWN used to have our s_id. Our PLOGI scheduled its
  	 * session deletion, but it's still in sess_del_work wq */
  	if (sess->deleted) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf002,
  		    "New command while old session %p is being deleted\n",
  		    sess);
  		return -EFAULT;
  	}
  
  	/*
  	 * Do kref_get() before returning + dropping qla_hw_data->hardware_lock.
  	 */
  	if (!kref_get_unless_zero(&sess->sess_kref)) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
  		    "%s: kref_get fail, %8phC oxid %x \n",
  		    __func__, sess->port_name,
  		     be16_to_cpu(atio->u.isp24.fcp_hdr.ox_id));
  		return -EFAULT;
  	}
  
  	cmd = qlt_get_tag(vha, sess, atio);
  	if (!cmd) {
  		ql_dbg(ql_dbg_io, vha, 0x3062,
  		    "qla_target(%d): Allocation of cmd failed\n", vha->vp_idx);
  		ha->tgt.tgt_ops->put_sess(sess);
  		return -EBUSY;
  	}
  
  	cmd->cmd_in_wq = 1;
  	cmd->trc_flags |= TRC_NEW_CMD;
  
  	spin_lock_irqsave(&vha->cmd_list_lock, flags);
  	list_add_tail(&cmd->cmd_list, &vha->qla_cmd_list);
  	spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  
  	INIT_WORK(&cmd->work, qlt_do_work);
  	if (vha->flags.qpairs_available) {
  		queue_work_on(cmd->se_cmd.cpuid, qla_tgt_wq, &cmd->work);
  	} else if (ha->msix_count) {
  		if (cmd->atio.u.isp24.fcp_cmnd.rddata)
  			queue_work_on(smp_processor_id(), qla_tgt_wq,
  			    &cmd->work);
  		else
  			queue_work_on(cmd->se_cmd.cpuid, qla_tgt_wq,
  			    &cmd->work);
  	} else {
  		queue_work(qla_tgt_wq, &cmd->work);
  	}
  
  	return 0;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_issue_task_mgmt(struct fc_port *sess, u64 lun,
  	int fn, void *iocb, int flags)
  {
  	struct scsi_qla_host *vha = sess->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt_mgmt_cmd *mcmd;
  	struct atio_from_isp *a = (struct atio_from_isp *)iocb;
  	struct qla_qpair_hint *h = &vha->vha_tgt.qla_tgt->qphints[0];
  
  	mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
  	if (!mcmd) {
  		ql_dbg(ql_dbg_tgt_tmr, vha, 0x10009,
  		    "qla_target(%d): Allocation of management "
  		    "command failed, some commands and their data could "
  		    "leak\n", vha->vp_idx);
  		return -ENOMEM;
  	}
  	memset(mcmd, 0, sizeof(*mcmd));
  	mcmd->sess = sess;
  
  	if (iocb) {
  		memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
  		    sizeof(mcmd->orig_iocb.imm_ntfy));
  	}
  	mcmd->tmr_func = fn;
  	mcmd->flags = flags;
  	mcmd->reset_count = ha->base_qpair->chip_reset;
  	mcmd->qpair = h->qpair;
  	mcmd->vha = vha;
  	mcmd->se_cmd.cpuid = h->cpuid;
  	mcmd->unpacked_lun = lun;
  
  	switch (fn) {
  	case QLA_TGT_LUN_RESET:
  	case QLA_TGT_CLEAR_TS:
  	case QLA_TGT_ABORT_TS:
  		abort_cmds_for_lun(vha, lun, a->u.isp24.fcp_hdr.s_id);
  		/* fall through */
  	case QLA_TGT_CLEAR_ACA:
  		h = qlt_find_qphint(vha, mcmd->unpacked_lun);
  		mcmd->qpair = h->qpair;
  		mcmd->se_cmd.cpuid = h->cpuid;
  		break;
  
  	case QLA_TGT_TARGET_RESET:
  	case QLA_TGT_NEXUS_LOSS_SESS:
  	case QLA_TGT_NEXUS_LOSS:
  	case QLA_TGT_ABORT_ALL:
  	default:
  		/* no-op */
  		break;
  	}
  
  	INIT_WORK(&mcmd->work, qlt_do_tmr_work);
  	queue_work_on(mcmd->se_cmd.cpuid, qla_tgt_wq,
  	    &mcmd->work);
  
  	return 0;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_handle_task_mgmt(struct scsi_qla_host *vha, void *iocb)
  {
  	struct atio_from_isp *a = (struct atio_from_isp *)iocb;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess;
  	u64 unpacked_lun;
  	int fn;
  	unsigned long flags;
  
  	fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
  	    a->u.isp24.fcp_hdr.s_id);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  	unpacked_lun =
  	    scsilun_to_int((struct scsi_lun *)&a->u.isp24.fcp_cmnd.lun);
  
  	if (sess == NULL || sess->deleted)
  		return -EFAULT;
  
  	return qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int __qlt_abort_task(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *iocb, struct fc_port *sess)
  {
  	struct atio_from_isp *a = (struct atio_from_isp *)iocb;
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt_mgmt_cmd *mcmd;
  	u64 unpacked_lun;
  	int rc;
  
  	mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
  	if (mcmd == NULL) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05f,
  		    "qla_target(%d): %s: Allocation of ABORT cmd failed\n",
  		    vha->vp_idx, __func__);
  		return -ENOMEM;
  	}
  	memset(mcmd, 0, sizeof(*mcmd));
  
  	mcmd->sess = sess;
  	memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
  	    sizeof(mcmd->orig_iocb.imm_ntfy));
  
  	unpacked_lun =
  	    scsilun_to_int((struct scsi_lun *)&a->u.isp24.fcp_cmnd.lun);
  	mcmd->reset_count = ha->base_qpair->chip_reset;
  	mcmd->tmr_func = QLA_TGT_2G_ABORT_TASK;
  	mcmd->qpair = ha->base_qpair;
  
  	rc = ha->tgt.tgt_ops->handle_tmr(mcmd, unpacked_lun, mcmd->tmr_func,
  	    le16_to_cpu(iocb->u.isp2x.seq_id));
  	if (rc != 0) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf060,
  		    "qla_target(%d): tgt_ops->handle_tmr() failed: %d\n",
  		    vha->vp_idx, rc);
  		mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
  		return -EFAULT;
  	}
  
  	return 0;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  static int qlt_abort_task(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *iocb)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess;
  	int loop_id;
  	unsigned long flags;
  
  	loop_id = GET_TARGET_ID(ha, (struct atio_from_isp *)iocb);
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  	if (sess == NULL) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf025,
  		    "qla_target(%d): task abort for unexisting "
  		    "session\n", vha->vp_idx);
  		return qlt_sched_sess_work(vha->vha_tgt.qla_tgt,
  		    QLA_TGT_SESS_WORK_ABORT, iocb, sizeof(*iocb));
  	}
  
  	return __qlt_abort_task(vha, iocb, sess);
  }
  
  void qlt_logo_completion_handler(fc_port_t *fcport, int rc)
  {
  	if (rc != MBS_COMMAND_COMPLETE) {
  		ql_dbg(ql_dbg_tgt_mgt, fcport->vha, 0xf093,
  			"%s: se_sess %p / sess %p from"
  			" port %8phC loop_id %#04x s_id %02x:%02x:%02x"
  			" LOGO failed: %#x\n",
  			__func__,
  			fcport->se_sess,
  			fcport,
  			fcport->port_name, fcport->loop_id,
  			fcport->d_id.b.domain, fcport->d_id.b.area,
  			fcport->d_id.b.al_pa, rc);
  	}
  
  	fcport->logout_completed = 1;
  }
  
  /*
  * ha->hardware_lock supposed to be held on entry (to protect tgt->sess_list)
  *
  * Schedules sessions with matching port_id/loop_id but different wwn for
  * deletion. Returns existing session with matching wwn if present.
  * Null otherwise.
  */
  struct fc_port *
  qlt_find_sess_invalidate_other(scsi_qla_host_t *vha, uint64_t wwn,
      port_id_t port_id, uint16_t loop_id, struct fc_port **conflict_sess)
  {
  	struct fc_port *sess = NULL, *other_sess;
  	uint64_t other_wwn;
  
  	*conflict_sess = NULL;
  
  	list_for_each_entry(other_sess, &vha->vp_fcports, list) {
  
  		other_wwn = wwn_to_u64(other_sess->port_name);
  
  		if (wwn == other_wwn) {
  			WARN_ON(sess);
  			sess = other_sess;
  			continue;
  		}
  
  		/* find other sess with nport_id collision */
  		if (port_id.b24 == other_sess->d_id.b24) {
  			if (loop_id != other_sess->loop_id) {
  				ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000c,
  				    "Invalidating sess %p loop_id %d wwn %llx.\n",
  				    other_sess, other_sess->loop_id, other_wwn);
  
  				/*
  				 * logout_on_delete is set by default, but another
  				 * session that has the same s_id/loop_id combo
  				 * might have cleared it when requested this session
  				 * deletion, so don't touch it
  				 */
  				qlt_schedule_sess_for_deletion(other_sess);
  			} else {
  				/*
  				 * Another wwn used to have our s_id/loop_id
  				 * kill the session, but don't free the loop_id
  				 */
  				ql_dbg(ql_dbg_tgt_tmr, vha, 0xf01b,
  				    "Invalidating sess %p loop_id %d wwn %llx.\n",
  				    other_sess, other_sess->loop_id, other_wwn);
  
  				other_sess->keep_nport_handle = 1;
  				if (other_sess->disc_state != DSC_DELETED)
  					*conflict_sess = other_sess;
  				qlt_schedule_sess_for_deletion(other_sess);
  			}
  			continue;
  		}
  
  		/* find other sess with nport handle collision */
  		if ((loop_id == other_sess->loop_id) &&
  			(loop_id != FC_NO_LOOP_ID)) {
  			ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000d,
  			       "Invalidating sess %p loop_id %d wwn %llx.\n",
  			       other_sess, other_sess->loop_id, other_wwn);
  
  			/* Same loop_id but different s_id
  			 * Ok to kill and logout */
  			qlt_schedule_sess_for_deletion(other_sess);
  		}
  	}
  
  	return sess;
  }
  
  /* Abort any commands for this s_id waiting on qla_tgt_wq workqueue */
  static int abort_cmds_for_s_id(struct scsi_qla_host *vha, port_id_t *s_id)
  {
  	struct qla_tgt_sess_op *op;
  	struct qla_tgt_cmd *cmd;
  	uint32_t key;
  	int count = 0;
  	unsigned long flags;
  
  	key = (((u32)s_id->b.domain << 16) |
  	       ((u32)s_id->b.area   <<  8) |
  	       ((u32)s_id->b.al_pa));
  
  	spin_lock_irqsave(&vha->cmd_list_lock, flags);
  	list_for_each_entry(op, &vha->qla_sess_op_cmd_list, cmd_list) {
  		uint32_t op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
  
  		if (op_key == key) {
  			op->aborted = true;
  			count++;
  		}
  	}
  
  	list_for_each_entry(op, &vha->unknown_atio_list, cmd_list) {
  		uint32_t op_key = sid_to_key(op->atio.u.isp24.fcp_hdr.s_id);
  
  		if (op_key == key) {
  			op->aborted = true;
  			count++;
  		}
  	}
  
  	list_for_each_entry(cmd, &vha->qla_cmd_list, cmd_list) {
  		uint32_t cmd_key = sid_to_key(cmd->atio.u.isp24.fcp_hdr.s_id);
  
  		if (cmd_key == key) {
  			cmd->aborted = 1;
  			count++;
  		}
  	}
  	spin_unlock_irqrestore(&vha->cmd_list_lock, flags);
  
  	return count;
  }
  
  static int qlt_handle_login(struct scsi_qla_host *vha,
      struct imm_ntfy_from_isp *iocb)
  {
  	struct fc_port *sess = NULL, *conflict_sess = NULL;
  	uint64_t wwn;
  	port_id_t port_id;
  	uint16_t loop_id, wd3_lo;
  	int res = 0;
  	struct qlt_plogi_ack_t *pla;
  	unsigned long flags;
  
  	lockdep_assert_held(&vha->hw->hardware_lock);
  
  	wwn = wwn_to_u64(iocb->u.isp24.port_name);
  
  	port_id.b.domain = iocb->u.isp24.port_id[2];
  	port_id.b.area   = iocb->u.isp24.port_id[1];
  	port_id.b.al_pa  = iocb->u.isp24.port_id[0];
  	port_id.b.rsvd_1 = 0;
  
  	loop_id = le16_to_cpu(iocb->u.isp24.nport_handle);
  
  	/* Mark all stale commands sitting in qla_tgt_wq for deletion */
  	abort_cmds_for_s_id(vha, &port_id);
  
  	if (wwn) {
  		spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
  		sess = qlt_find_sess_invalidate_other(vha, wwn,
  		    port_id, loop_id, &conflict_sess);
  		spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  	} else {
  		ql_dbg(ql_dbg_disc, vha, 0xffff,
  		    "%s %d Term INOT due to WWN=0 lid=%d, NportID %06X ",
  		    __func__, __LINE__, loop_id, port_id.b24);
  		qlt_send_term_imm_notif(vha, iocb, 1);
  		goto out;
  	}
  
  	if (IS_SW_RESV_ADDR(port_id)) {
  		res = 1;
  		goto out;
  	}
  
  	pla = qlt_plogi_ack_find_add(vha, &port_id, iocb);
  	if (!pla) {
  		ql_dbg(ql_dbg_disc + ql_dbg_verbose, vha, 0xffff,
  		    "%s %d %8phC Term INOT due to mem alloc fail",
  		    __func__, __LINE__,
  		    iocb->u.isp24.port_name);
  		qlt_send_term_imm_notif(vha, iocb, 1);
  		goto out;
  	}
  
  	if (conflict_sess) {
  		conflict_sess->login_gen++;
  		qlt_plogi_ack_link(vha, pla, conflict_sess,
  		    QLT_PLOGI_LINK_CONFLICT);
  	}
  
  	if (!sess) {
  		pla->ref_count++;
  		ql_dbg(ql_dbg_disc, vha, 0xffff,
  		    "%s %d %8phC post new sess\n",
  		    __func__, __LINE__, iocb->u.isp24.port_name);
  		if (iocb->u.isp24.status_subcode == ELS_PLOGI)
  			qla24xx_post_newsess_work(vha, &port_id,
  			    iocb->u.isp24.port_name,
  			    iocb->u.isp24.u.plogi.node_name,
  			    pla, FC4_TYPE_UNKNOWN);
  		else
  			qla24xx_post_newsess_work(vha, &port_id,
  			    iocb->u.isp24.port_name, NULL,
  			    pla, FC4_TYPE_UNKNOWN);
  
  		goto out;
  	}
  
  	if (sess->disc_state == DSC_UPD_FCPORT) {
  		u16 sec;
  
  		/*
  		 * Remote port registration is still going on from
  		 * previous login. Allow it to finish before we
  		 * accept the new login.
  		 */
  		sess->next_disc_state = DSC_DELETE_PEND;
  		sec = jiffies_to_msecs(jiffies -
  		    sess->jiffies_at_registration) / 1000;
  		if (sess->sec_since_registration < sec && sec &&
  		    !(sec % 5)) {
  			sess->sec_since_registration = sec;
  			ql_dbg(ql_dbg_disc, vha, 0xffff,
  			    "%s %8phC - Slow Rport registration (%d Sec)\n",
  			    __func__, sess->port_name, sec);
  		}
  
  		if (!conflict_sess) {
  			list_del(&pla->list);
  			kmem_cache_free(qla_tgt_plogi_cachep, pla);
  		}
  
  		qlt_send_term_imm_notif(vha, iocb, 1);
  		goto out;
  	}
  
  	qlt_plogi_ack_link(vha, pla, sess, QLT_PLOGI_LINK_SAME_WWN);
  	sess->d_id = port_id;
  	sess->login_gen++;
  
  	if (iocb->u.isp24.status_subcode == ELS_PRLI) {
  		sess->fw_login_state = DSC_LS_PRLI_PEND;
  		sess->local = 0;
  		sess->loop_id = loop_id;
  		sess->d_id = port_id;
  		sess->fw_login_state = DSC_LS_PRLI_PEND;
  		wd3_lo = le16_to_cpu(iocb->u.isp24.u.prli.wd3_lo);
  
  		if (wd3_lo & BIT_7)
  			sess->conf_compl_supported = 1;
  
  		if ((wd3_lo & BIT_4) == 0)
  			sess->port_type = FCT_INITIATOR;
  		else
  			sess->port_type = FCT_TARGET;
  
  	} else
  		sess->fw_login_state = DSC_LS_PLOGI_PEND;
  
  
  	ql_dbg(ql_dbg_disc, vha, 0x20f9,
  	    "%s %d %8phC  DS %d\n",
  	    __func__, __LINE__, sess->port_name, sess->disc_state);
  
  	switch (sess->disc_state) {
  	case DSC_DELETED:
  	case DSC_LOGIN_PEND:
  		qlt_plogi_ack_unref(vha, pla);
  		break;
  
  	default:
  		/*
  		 * Under normal circumstances we want to release nport handle
  		 * during LOGO process to avoid nport handle leaks inside FW.
  		 * The exception is when LOGO is done while another PLOGI with
  		 * the same nport handle is waiting as might be the case here.
  		 * Note: there is always a possibily of a race where session
  		 * deletion has already started for other reasons (e.g. ACL
  		 * removal) and now PLOGI arrives:
  		 * 1. if PLOGI arrived in FW after nport handle has been freed,
  		 *    FW must have assigned this PLOGI a new/same handle and we
  		 *    can proceed ACK'ing it as usual when session deletion
  		 *    completes.
  		 * 2. if PLOGI arrived in FW before LOGO with LCF_FREE_NPORT
  		 *    bit reached it, the handle has now been released. We'll
  		 *    get an error when we ACK this PLOGI. Nothing will be sent
  		 *    back to initiator. Initiator should eventually retry
  		 *    PLOGI and situation will correct itself.
  		 */
  		sess->keep_nport_handle = ((sess->loop_id == loop_id) &&
  		    (sess->d_id.b24 == port_id.b24));
  
  		ql_dbg(ql_dbg_disc, vha, 0x20f9,
  		    "%s %d %8phC post del sess\n",
  		    __func__, __LINE__, sess->port_name);
  
  
  		qlt_schedule_sess_for_deletion(sess);
  		break;
  	}
  out:
  	return res;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static int qlt_24xx_handle_els(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *iocb)
  {
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess = NULL, *conflict_sess = NULL;
  	uint64_t wwn;
  	port_id_t port_id;
  	uint16_t loop_id;
  	uint16_t wd3_lo;
  	int res = 0;
  	unsigned long flags;
  
  	lockdep_assert_held(&ha->hardware_lock);
  
  	wwn = wwn_to_u64(iocb->u.isp24.port_name);
  
  	port_id.b.domain = iocb->u.isp24.port_id[2];
  	port_id.b.area   = iocb->u.isp24.port_id[1];
  	port_id.b.al_pa  = iocb->u.isp24.port_id[0];
  	port_id.b.rsvd_1 = 0;
  
  	loop_id = le16_to_cpu(iocb->u.isp24.nport_handle);
  
  	ql_dbg(ql_dbg_disc, vha, 0xf026,
  	    "qla_target(%d): Port ID: %02x:%02x:%02x ELS opcode: 0x%02x lid %d %8phC\n",
  	    vha->vp_idx, iocb->u.isp24.port_id[2],
  		iocb->u.isp24.port_id[1], iocb->u.isp24.port_id[0],
  		   iocb->u.isp24.status_subcode, loop_id,
  		iocb->u.isp24.port_name);
  
  	/* res = 1 means ack at the end of thread
  	 * res = 0 means ack async/later.
  	 */
  	switch (iocb->u.isp24.status_subcode) {
  	case ELS_PLOGI:
  		res = qlt_handle_login(vha, iocb);
  		break;
  
  	case ELS_PRLI:
  		if (N2N_TOPO(ha)) {
  			sess = qla2x00_find_fcport_by_wwpn(vha,
  			    iocb->u.isp24.port_name, 1);
  
  			if (sess && sess->plogi_link[QLT_PLOGI_LINK_SAME_WWN]) {
  				ql_dbg(ql_dbg_disc, vha, 0xffff,
  				    "%s %d %8phC Term PRLI due to PLOGI ACK not completed\n",
  				    __func__, __LINE__,
  				    iocb->u.isp24.port_name);
  				qlt_send_term_imm_notif(vha, iocb, 1);
  				break;
  			}
  
  			res = qlt_handle_login(vha, iocb);
  			break;
  		}
  
  		if (IS_SW_RESV_ADDR(port_id)) {
  			res = 1;
  			break;
  		}
  
  		wd3_lo = le16_to_cpu(iocb->u.isp24.u.prli.wd3_lo);
  
  		if (wwn) {
  			spin_lock_irqsave(&tgt->ha->tgt.sess_lock, flags);
  			sess = qlt_find_sess_invalidate_other(vha, wwn, port_id,
  				loop_id, &conflict_sess);
  			spin_unlock_irqrestore(&tgt->ha->tgt.sess_lock, flags);
  		}
  
  		if (conflict_sess) {
  			switch (conflict_sess->disc_state) {
  			case DSC_DELETED:
  			case DSC_DELETE_PEND:
  				break;
  			default:
  				ql_dbg(ql_dbg_tgt_mgt, vha, 0xf09b,
  				    "PRLI with conflicting sess %p port %8phC\n",
  				    conflict_sess, conflict_sess->port_name);
  				conflict_sess->fw_login_state =
  				    DSC_LS_PORT_UNAVAIL;
  				qlt_send_term_imm_notif(vha, iocb, 1);
  				res = 0;
  				break;
  			}
  		}
  
  		if (sess != NULL) {
  			bool delete = false;
  			int sec;
  
  			spin_lock_irqsave(&tgt->ha->tgt.sess_lock, flags);
  			switch (sess->fw_login_state) {
  			case DSC_LS_PLOGI_PEND:
  			case DSC_LS_PLOGI_COMP:
  			case DSC_LS_PRLI_COMP:
  				break;
  			default:
  				delete = true;
  				break;
  			}
  
  			switch (sess->disc_state) {
  			case DSC_UPD_FCPORT:
  				spin_unlock_irqrestore(&tgt->ha->tgt.sess_lock,
  				    flags);
  
  				sec = jiffies_to_msecs(jiffies -
  				    sess->jiffies_at_registration)/1000;
  				if (sess->sec_since_registration < sec && sec &&
  				    !(sec % 5)) {
  					sess->sec_since_registration = sec;
  					ql_dbg(ql_dbg_disc, sess->vha, 0xffff,
  					    "%s %8phC : Slow Rport registration(%d Sec)\n",
  					    __func__, sess->port_name, sec);
  				}
  				qlt_send_term_imm_notif(vha, iocb, 1);
  				return 0;
  
  			case DSC_LOGIN_PEND:
  			case DSC_GPDB:
  			case DSC_LOGIN_COMPLETE:
  			case DSC_ADISC:
  				delete = false;
  				break;
  			default:
  				break;
  			}
  
  			if (delete) {
  				spin_unlock_irqrestore(&tgt->ha->tgt.sess_lock,
  				    flags);
  				/*
  				 * Impatient initiator sent PRLI before last
  				 * PLOGI could finish. Will force him to re-try,
  				 * while last one finishes.
  				 */
  				ql_log(ql_log_warn, sess->vha, 0xf095,
  				    "sess %p PRLI received, before plogi ack.\n",
  				    sess);
  				qlt_send_term_imm_notif(vha, iocb, 1);
  				res = 0;
  				break;
  			}
  
  			/*
  			 * This shouldn't happen under normal circumstances,
  			 * since we have deleted the old session during PLOGI
  			 */
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf096,
  			    "PRLI (loop_id %#04x) for existing sess %p (loop_id %#04x)\n",
  			    sess->loop_id, sess, iocb->u.isp24.nport_handle);
  
  			sess->local = 0;
  			sess->loop_id = loop_id;
  			sess->d_id = port_id;
  			sess->fw_login_state = DSC_LS_PRLI_PEND;
  
  			if (wd3_lo & BIT_7)
  				sess->conf_compl_supported = 1;
  
  			if ((wd3_lo & BIT_4) == 0)
  				sess->port_type = FCT_INITIATOR;
  			else
  				sess->port_type = FCT_TARGET;
  
  			spin_unlock_irqrestore(&tgt->ha->tgt.sess_lock, flags);
  		}
  		res = 1; /* send notify ack */
  
  		/* Make session global (not used in fabric mode) */
  		if (ha->current_topology != ISP_CFG_F) {
  			if (sess) {
  				ql_dbg(ql_dbg_disc, vha, 0x20fa,
  				    "%s %d %8phC post nack\n",
  				    __func__, __LINE__, sess->port_name);
  				qla24xx_post_nack_work(vha, sess, iocb,
  					SRB_NACK_PRLI);
  				res = 0;
  			} else {
  				set_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags);
  				set_bit(LOCAL_LOOP_UPDATE, &vha->dpc_flags);
  				qla2xxx_wake_dpc(vha);
  			}
  		} else {
  			if (sess) {
  				ql_dbg(ql_dbg_disc, vha, 0x20fb,
  				    "%s %d %8phC post nack\n",
  				    __func__, __LINE__, sess->port_name);
  				qla24xx_post_nack_work(vha, sess, iocb,
  					SRB_NACK_PRLI);
  				res = 0;
  			}
  		}
  		break;
  
  	case ELS_TPRLO:
  		if (le16_to_cpu(iocb->u.isp24.flags) &
  			NOTIFY24XX_FLAGS_GLOBAL_TPRLO) {
  			loop_id = 0xFFFF;
  			qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS);
  			res = 1;
  			break;
  		}
  		/* fall through */
  	case ELS_LOGO:
  	case ELS_PRLO:
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  		sess = qla2x00_find_fcport_by_loopid(vha, loop_id);
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  		if (sess) {
  			sess->login_gen++;
  			sess->fw_login_state = DSC_LS_LOGO_PEND;
  			sess->logo_ack_needed = 1;
  			memcpy(sess->iocb, iocb, IOCB_SIZE);
  		}
  
  		res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
  
  		ql_dbg(ql_dbg_disc, vha, 0x20fc,
  		    "%s: logo %llx res %d sess %p ",
  		    __func__, wwn, res, sess);
  		if (res == 0) {
  			/*
  			 * cmd went upper layer, look for qlt_xmit_tm_rsp()
  			 * for LOGO_ACK & sess delete
  			 */
  			BUG_ON(!sess);
  			res = 0;
  		} else {
  			/* cmd did not go to upper layer. */
  			if (sess) {
  				qlt_schedule_sess_for_deletion(sess);
  				res = 0;
  			}
  			/* else logo will be ack */
  		}
  		break;
  	case ELS_PDISC:
  	case ELS_ADISC:
  	{
  		struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  
  		if (tgt->link_reinit_iocb_pending) {
  			qlt_send_notify_ack(ha->base_qpair,
  			    &tgt->link_reinit_iocb, 0, 0, 0, 0, 0, 0);
  			tgt->link_reinit_iocb_pending = 0;
  		}
  
  		sess = qla2x00_find_fcport_by_wwpn(vha,
  		    iocb->u.isp24.port_name, 1);
  		if (sess) {
  			ql_dbg(ql_dbg_disc, vha, 0x20fd,
  				"sess %p lid %d|%d DS %d LS %d\n",
  				sess, sess->loop_id, loop_id,
  				sess->disc_state, sess->fw_login_state);
  		}
  
  		res = 1; /* send notify ack */
  		break;
  	}
  
  	case ELS_FLOGI:	/* should never happen */
  	default:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf061,
  		    "qla_target(%d): Unsupported ELS command %x "
  		    "received\n", vha->vp_idx, iocb->u.isp24.status_subcode);
  		res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
  		break;
  	}
  
  	ql_dbg(ql_dbg_disc, vha, 0xf026,
  	    "qla_target(%d): Exit ELS opcode: 0x%02x res %d\n",
  	    vha->vp_idx, iocb->u.isp24.status_subcode, res);
  
  	return res;
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  static void qlt_handle_imm_notify(struct scsi_qla_host *vha,
  	struct imm_ntfy_from_isp *iocb)
  {
  	struct qla_hw_data *ha = vha->hw;
  	uint32_t add_flags = 0;
  	int send_notify_ack = 1;
  	uint16_t status;
  
  	lockdep_assert_held(&ha->hardware_lock);
  
  	status = le16_to_cpu(iocb->u.isp2x.status);
  	switch (status) {
  	case IMM_NTFY_LIP_RESET:
  	{
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf032,
  		    "qla_target(%d): LIP reset (loop %#x), subcode %x\n",
  		    vha->vp_idx, le16_to_cpu(iocb->u.isp24.nport_handle),
  		    iocb->u.isp24.status_subcode);
  
  		if (qlt_reset(vha, iocb, QLA_TGT_ABORT_ALL) == 0)
  			send_notify_ack = 0;
  		break;
  	}
  
  	case IMM_NTFY_LIP_LINK_REINIT:
  	{
  		struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf033,
  		    "qla_target(%d): LINK REINIT (loop %#x, "
  		    "subcode %x)\n", vha->vp_idx,
  		    le16_to_cpu(iocb->u.isp24.nport_handle),
  		    iocb->u.isp24.status_subcode);
  		if (tgt->link_reinit_iocb_pending) {
  			qlt_send_notify_ack(ha->base_qpair,
  			    &tgt->link_reinit_iocb, 0, 0, 0, 0, 0, 0);
  		}
  		memcpy(&tgt->link_reinit_iocb, iocb, sizeof(*iocb));
  		tgt->link_reinit_iocb_pending = 1;
  		/*
  		 * QLogic requires to wait after LINK REINIT for possible
  		 * PDISC or ADISC ELS commands
  		 */
  		send_notify_ack = 0;
  		break;
  	}
  
  	case IMM_NTFY_PORT_LOGOUT:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf034,
  		    "qla_target(%d): Port logout (loop "
  		    "%#x, subcode %x)\n", vha->vp_idx,
  		    le16_to_cpu(iocb->u.isp24.nport_handle),
  		    iocb->u.isp24.status_subcode);
  
  		if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS) == 0)
  			send_notify_ack = 0;
  		/* The sessions will be cleared in the callback, if needed */
  		break;
  
  	case IMM_NTFY_GLBL_TPRLO:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf035,
  		    "qla_target(%d): Global TPRLO (%x)\n", vha->vp_idx, status);
  		if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS) == 0)
  			send_notify_ack = 0;
  		/* The sessions will be cleared in the callback, if needed */
  		break;
  
  	case IMM_NTFY_PORT_CONFIG:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf036,
  		    "qla_target(%d): Port config changed (%x)\n", vha->vp_idx,
  		    status);
  		if (qlt_reset(vha, iocb, QLA_TGT_ABORT_ALL) == 0)
  			send_notify_ack = 0;
  		/* The sessions will be cleared in the callback, if needed */
  		break;
  
  	case IMM_NTFY_GLBL_LOGO:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06a,
  		    "qla_target(%d): Link failure detected\n",
  		    vha->vp_idx);
  		/* I_T nexus loss */
  		if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS) == 0)
  			send_notify_ack = 0;
  		break;
  
  	case IMM_NTFY_IOCB_OVERFLOW:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06b,
  		    "qla_target(%d): Cannot provide requested "
  		    "capability (IOCB overflowed the immediate notify "
  		    "resource count)\n", vha->vp_idx);
  		break;
  
  	case IMM_NTFY_ABORT_TASK:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf037,
  		    "qla_target(%d): Abort Task (S %08x I %#x -> "
  		    "L %#x)\n", vha->vp_idx,
  		    le16_to_cpu(iocb->u.isp2x.seq_id),
  		    GET_TARGET_ID(ha, (struct atio_from_isp *)iocb),
  		    le16_to_cpu(iocb->u.isp2x.lun));
  		if (qlt_abort_task(vha, iocb) == 0)
  			send_notify_ack = 0;
  		break;
  
  	case IMM_NTFY_RESOURCE:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06c,
  		    "qla_target(%d): Out of resources, host %ld\n",
  		    vha->vp_idx, vha->host_no);
  		break;
  
  	case IMM_NTFY_MSG_RX:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf038,
  		    "qla_target(%d): Immediate notify task %x\n",
  		    vha->vp_idx, iocb->u.isp2x.task_flags);
  		break;
  
  	case IMM_NTFY_ELS:
  		if (qlt_24xx_handle_els(vha, iocb) == 0)
  			send_notify_ack = 0;
  		break;
  	default:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06d,
  		    "qla_target(%d): Received unknown immediate "
  		    "notify status %x\n", vha->vp_idx, status);
  		break;
  	}
  
  	if (send_notify_ack)
  		qlt_send_notify_ack(ha->base_qpair, iocb, add_flags, 0, 0, 0,
  		    0, 0);
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   * This function sends busy to ISP 2xxx or 24xx.
   */
  static int __qlt_send_busy(struct qla_qpair *qpair,
  	struct atio_from_isp *atio, uint16_t status)
  {
  	struct scsi_qla_host *vha = qpair->vha;
  	struct ctio7_to_24xx *ctio24;
  	struct qla_hw_data *ha = vha->hw;
  	request_t *pkt;
  	struct fc_port *sess = NULL;
  	unsigned long flags;
  	u16 temp;
  	port_id_t id;
  
  	id = be_to_port_id(atio->u.isp24.fcp_hdr.s_id);
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  	sess = qla2x00_find_fcport_by_nportid(vha, &id, 1);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  	if (!sess) {
  		qlt_send_term_exchange(qpair, NULL, atio, 1, 0);
  		return 0;
  	}
  	/* Sending marker isn't necessary, since we called from ISR */
  
  	pkt = (request_t *)__qla2x00_alloc_iocbs(qpair, NULL);
  	if (!pkt) {
  		ql_dbg(ql_dbg_io, vha, 0x3063,
  		    "qla_target(%d): %s failed: unable to allocate "
  		    "request packet", vha->vp_idx, __func__);
  		return -ENOMEM;
  	}
  
  	qpair->tgt_counters.num_q_full_sent++;
  	pkt->entry_count = 1;
  	pkt->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
  
  	ctio24 = (struct ctio7_to_24xx *)pkt;
  	ctio24->entry_type = CTIO_TYPE7;
  	ctio24->nport_handle = sess->loop_id;
  	ctio24->timeout = cpu_to_le16(QLA_TGT_TIMEOUT);
  	ctio24->vp_index = vha->vp_idx;
  	ctio24->initiator_id = be_id_to_le(atio->u.isp24.fcp_hdr.s_id);
  	ctio24->exchange_addr = atio->u.isp24.exchange_addr;
  	temp = (atio->u.isp24.attr << 9) |
  		CTIO7_FLAGS_STATUS_MODE_1 | CTIO7_FLAGS_SEND_STATUS |
  		CTIO7_FLAGS_DONT_RET_CTIO;
  	ctio24->u.status1.flags = cpu_to_le16(temp);
  	/*
  	 * CTIO from fw w/o se_cmd doesn't provide enough info to retry it,
  	 * if the explicit conformation is used.
  	 */
  	ctio24->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
  	ctio24->u.status1.scsi_status = cpu_to_le16(status);
  
  	ctio24->u.status1.residual = get_datalen_for_atio(atio);
  
  	if (ctio24->u.status1.residual != 0)
  		ctio24->u.status1.scsi_status |= SS_RESIDUAL_UNDER;
  
  	/* Memory Barrier */
  	wmb();
  	if (qpair->reqq_start_iocbs)
  		qpair->reqq_start_iocbs(qpair);
  	else
  		qla2x00_start_iocbs(vha, qpair->req);
  	return 0;
  }
  
  /*
   * This routine is used to allocate a command for either a QFull condition
   * (ie reply SAM_STAT_BUSY) or to terminate an exchange that did not go
   * out previously.
   */
  static void
  qlt_alloc_qfull_cmd(struct scsi_qla_host *vha,
  	struct atio_from_isp *atio, uint16_t status, int qfull)
  {
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess;
  	struct se_session *se_sess;
  	struct qla_tgt_cmd *cmd;
  	int tag, cpu;
  	unsigned long flags;
  
  	if (unlikely(tgt->tgt_stop)) {
  		ql_dbg(ql_dbg_io, vha, 0x300a,
  			"New command while device %p is shutting down\n", tgt);
  		return;
  	}
  
  	if ((vha->hw->tgt.num_qfull_cmds_alloc + 1) > MAX_QFULL_CMDS_ALLOC) {
  		vha->hw->tgt.num_qfull_cmds_dropped++;
  		if (vha->hw->tgt.num_qfull_cmds_dropped >
  			vha->qla_stats.stat_max_qfull_cmds_dropped)
  			vha->qla_stats.stat_max_qfull_cmds_dropped =
  				vha->hw->tgt.num_qfull_cmds_dropped;
  
  		ql_dbg(ql_dbg_io, vha, 0x3068,
  			"qla_target(%d): %s: QFull CMD dropped[%d]\n",
  			vha->vp_idx, __func__,
  			vha->hw->tgt.num_qfull_cmds_dropped);
  
  		qlt_chk_exch_leak_thresh_hold(vha);
  		return;
  	}
  
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id
  		(vha, atio->u.isp24.fcp_hdr.s_id);
  	if (!sess)
  		return;
  
  	se_sess = sess->se_sess;
  
  	tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
  	if (tag < 0) {
  		ql_dbg(ql_dbg_io, vha, 0x3009,
  			"qla_target(%d): %s: Allocation of cmd failed\n",
  			vha->vp_idx, __func__);
  
  		vha->hw->tgt.num_qfull_cmds_dropped++;
  		if (vha->hw->tgt.num_qfull_cmds_dropped >
  			vha->qla_stats.stat_max_qfull_cmds_dropped)
  			vha->qla_stats.stat_max_qfull_cmds_dropped =
  				vha->hw->tgt.num_qfull_cmds_dropped;
  
  		qlt_chk_exch_leak_thresh_hold(vha);
  		return;
  	}
  
  	cmd = &((struct qla_tgt_cmd *)se_sess->sess_cmd_map)[tag];
  	memset(cmd, 0, sizeof(struct qla_tgt_cmd));
  
  	qlt_incr_num_pend_cmds(vha);
  	INIT_LIST_HEAD(&cmd->cmd_list);
  	memcpy(&cmd->atio, atio, sizeof(*atio));
  
  	cmd->tgt = vha->vha_tgt.qla_tgt;
  	cmd->vha = vha;
  	cmd->reset_count = ha->base_qpair->chip_reset;
  	cmd->q_full = 1;
  	cmd->qpair = ha->base_qpair;
  	cmd->se_cmd.map_cpu = cpu;
  
  	if (qfull) {
  		cmd->q_full = 1;
  		/* NOTE: borrowing the state field to carry the status */
  		cmd->state = status;
  	} else
  		cmd->term_exchg = 1;
  
  	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
  	list_add_tail(&cmd->cmd_list, &vha->hw->tgt.q_full_list);
  
  	vha->hw->tgt.num_qfull_cmds_alloc++;
  	if (vha->hw->tgt.num_qfull_cmds_alloc >
  		vha->qla_stats.stat_max_qfull_cmds_alloc)
  		vha->qla_stats.stat_max_qfull_cmds_alloc =
  			vha->hw->tgt.num_qfull_cmds_alloc;
  	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  }
  
  int
  qlt_free_qfull_cmds(struct qla_qpair *qpair)
  {
  	struct scsi_qla_host *vha = qpair->vha;
  	struct qla_hw_data *ha = vha->hw;
  	unsigned long flags;
  	struct qla_tgt_cmd *cmd, *tcmd;
  	struct list_head free_list, q_full_list;
  	int rc = 0;
  
  	if (list_empty(&ha->tgt.q_full_list))
  		return 0;
  
  	INIT_LIST_HEAD(&free_list);
  	INIT_LIST_HEAD(&q_full_list);
  
  	spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
  	if (list_empty(&ha->tgt.q_full_list)) {
  		spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  		return 0;
  	}
  
  	list_splice_init(&vha->hw->tgt.q_full_list, &q_full_list);
  	spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  
  	spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  	list_for_each_entry_safe(cmd, tcmd, &q_full_list, cmd_list) {
  		if (cmd->q_full)
  			/* cmd->state is a borrowed field to hold status */
  			rc = __qlt_send_busy(qpair, &cmd->atio, cmd->state);
  		else if (cmd->term_exchg)
  			rc = __qlt_send_term_exchange(qpair, NULL, &cmd->atio);
  
  		if (rc == -ENOMEM)
  			break;
  
  		if (cmd->q_full)
  			ql_dbg(ql_dbg_io, vha, 0x3006,
  			    "%s: busy sent for ox_id[%04x]\n", __func__,
  			    be16_to_cpu(cmd->atio.u.isp24.fcp_hdr.ox_id));
  		else if (cmd->term_exchg)
  			ql_dbg(ql_dbg_io, vha, 0x3007,
  			    "%s: Term exchg sent for ox_id[%04x]\n", __func__,
  			    be16_to_cpu(cmd->atio.u.isp24.fcp_hdr.ox_id));
  		else
  			ql_dbg(ql_dbg_io, vha, 0x3008,
  			    "%s: Unexpected cmd in QFull list %p\n", __func__,
  			    cmd);
  
  		list_del(&cmd->cmd_list);
  		list_add_tail(&cmd->cmd_list, &free_list);
  
  		/* piggy back on hardware_lock for protection */
  		vha->hw->tgt.num_qfull_cmds_alloc--;
  	}
  	spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  
  	cmd = NULL;
  
  	list_for_each_entry_safe(cmd, tcmd, &free_list, cmd_list) {
  		list_del(&cmd->cmd_list);
  		/* This cmd was never sent to TCM.  There is no need
  		 * to schedule free or call free_cmd
  		 */
  		qlt_free_cmd(cmd);
  	}
  
  	if (!list_empty(&q_full_list)) {
  		spin_lock_irqsave(&vha->hw->tgt.q_full_lock, flags);
  		list_splice(&q_full_list, &vha->hw->tgt.q_full_list);
  		spin_unlock_irqrestore(&vha->hw->tgt.q_full_lock, flags);
  	}
  
  	return rc;
  }
  
  static void
  qlt_send_busy(struct qla_qpair *qpair, struct atio_from_isp *atio,
      uint16_t status)
  {
  	int rc = 0;
  	struct scsi_qla_host *vha = qpair->vha;
  
  	rc = __qlt_send_busy(qpair, atio, status);
  	if (rc == -ENOMEM)
  		qlt_alloc_qfull_cmd(vha, atio, status, 1);
  }
  
  static int
  qlt_chk_qfull_thresh_hold(struct scsi_qla_host *vha, struct qla_qpair *qpair,
  	struct atio_from_isp *atio, uint8_t ha_locked)
  {
  	struct qla_hw_data *ha = vha->hw;
  	unsigned long flags;
  
  	if (ha->tgt.num_pend_cmds < Q_FULL_THRESH_HOLD(ha))
  		return 0;
  
  	if (!ha_locked)
  		spin_lock_irqsave(&ha->hardware_lock, flags);
  	qlt_send_busy(qpair, atio, qla_sam_status);
  	if (!ha_locked)
  		spin_unlock_irqrestore(&ha->hardware_lock, flags);
  
  	return 1;
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  /* called via callback from qla2xxx */
  static void qlt_24xx_atio_pkt(struct scsi_qla_host *vha,
  	struct atio_from_isp *atio, uint8_t ha_locked)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	int rc;
  	unsigned long flags = 0;
  
  	if (unlikely(tgt == NULL)) {
  		ql_dbg(ql_dbg_tgt, vha, 0x3064,
  		    "ATIO pkt, but no tgt (ha %p)", ha);
  		return;
  	}
  	/*
  	 * In tgt_stop mode we also should allow all requests to pass.
  	 * Otherwise, some commands can stuck.
  	 */
  
  	tgt->atio_irq_cmd_count++;
  
  	switch (atio->u.raw.entry_type) {
  	case ATIO_TYPE7:
  		if (unlikely(atio->u.isp24.exchange_addr ==
  		    ATIO_EXCHANGE_ADDRESS_UNKNOWN)) {
  			ql_dbg(ql_dbg_io, vha, 0x3065,
  			    "qla_target(%d): ATIO_TYPE7 "
  			    "received with UNKNOWN exchange address, "
  			    "sending QUEUE_FULL\n", vha->vp_idx);
  			if (!ha_locked)
  				spin_lock_irqsave(&ha->hardware_lock, flags);
  			qlt_send_busy(ha->base_qpair, atio, qla_sam_status);
  			if (!ha_locked)
  				spin_unlock_irqrestore(&ha->hardware_lock,
  				    flags);
  			break;
  		}
  
  		if (likely(atio->u.isp24.fcp_cmnd.task_mgmt_flags == 0)) {
  			rc = qlt_chk_qfull_thresh_hold(vha, ha->base_qpair,
  			    atio, ha_locked);
  			if (rc != 0) {
  				tgt->atio_irq_cmd_count--;
  				return;
  			}
  			rc = qlt_handle_cmd_for_atio(vha, atio);
  		} else {
  			rc = qlt_handle_task_mgmt(vha, atio);
  		}
  		if (unlikely(rc != 0)) {
  			if (!ha_locked)
  				spin_lock_irqsave(&ha->hardware_lock, flags);
  			switch (rc) {
  			case -ENODEV:
  				ql_dbg(ql_dbg_tgt, vha, 0xe05f,
  				    "qla_target: Unable to send command to target\n");
  				break;
  			case -EBADF:
  				ql_dbg(ql_dbg_tgt, vha, 0xe05f,
  				    "qla_target: Unable to send command to target, sending TERM EXCHANGE for rsp\n");
  				qlt_send_term_exchange(ha->base_qpair, NULL,
  				    atio, 1, 0);
  				break;
  			case -EBUSY:
  				ql_dbg(ql_dbg_tgt, vha, 0xe060,
  				    "qla_target(%d): Unable to send command to target, sending BUSY status\n",
  				    vha->vp_idx);
  				qlt_send_busy(ha->base_qpair, atio,
  				    tc_sam_status);
  				break;
  			default:
  				ql_dbg(ql_dbg_tgt, vha, 0xe060,
  				    "qla_target(%d): Unable to send command to target, sending BUSY status\n",
  				    vha->vp_idx);
  				qlt_send_busy(ha->base_qpair, atio,
  				    qla_sam_status);
  				break;
  			}
  			if (!ha_locked)
  				spin_unlock_irqrestore(&ha->hardware_lock,
  				    flags);
  		}
  		break;
  
  	case IMMED_NOTIFY_TYPE:
  	{
  		if (unlikely(atio->u.isp2x.entry_status != 0)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe05b,
  			    "qla_target(%d): Received ATIO packet %x "
  			    "with error status %x\n", vha->vp_idx,
  			    atio->u.raw.entry_type,
  			    atio->u.isp2x.entry_status);
  			break;
  		}
  		ql_dbg(ql_dbg_tgt, vha, 0xe02e, "%s", "IMMED_NOTIFY ATIO");
  
  		if (!ha_locked)
  			spin_lock_irqsave(&ha->hardware_lock, flags);
  		qlt_handle_imm_notify(vha, (struct imm_ntfy_from_isp *)atio);
  		if (!ha_locked)
  			spin_unlock_irqrestore(&ha->hardware_lock, flags);
  		break;
  	}
  
  	default:
  		ql_dbg(ql_dbg_tgt, vha, 0xe05c,
  		    "qla_target(%d): Received unknown ATIO atio "
  		    "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
  		break;
  	}
  
  	tgt->atio_irq_cmd_count--;
  }
  
  /*
   * qpair lock is assume to be held
   * rc = 0 : send terminate & abts respond
   * rc != 0: do not send term & abts respond
   */
  static int qlt_chk_unresolv_exchg(struct scsi_qla_host *vha,
      struct qla_qpair *qpair, struct abts_resp_from_24xx_fw *entry)
  {
  	struct qla_hw_data *ha = vha->hw;
  	int rc = 0;
  
  	/*
  	 * Detect unresolved exchange. If the same ABTS is unable
  	 * to terminate an existing command and the same ABTS loops
  	 * between FW & Driver, then force FW dump. Under 1 jiff,
  	 * we should see multiple loops.
  	 */
  	if (qpair->retry_term_exchg_addr == entry->exchange_addr_to_abort &&
  	    qpair->retry_term_jiff == jiffies) {
  		/* found existing exchange */
  		qpair->retry_term_cnt++;
  		if (qpair->retry_term_cnt >= 5) {
  			rc = EIO;
  			qpair->retry_term_cnt = 0;
  			ql_log(ql_log_warn, vha, 0xffff,
  			    "Unable to send ABTS Respond. Dumping firmware.\n");
  			ql_dump_buffer(ql_dbg_tgt_mgt + ql_dbg_buffer,
  			    vha, 0xffff, (uint8_t *)entry, sizeof(*entry));
  
  			if (qpair == ha->base_qpair)
  				ha->isp_ops->fw_dump(vha, 1);
  			else
  				ha->isp_ops->fw_dump(vha, 0);
  
  			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
  			qla2xxx_wake_dpc(vha);
  		}
  	} else if (qpair->retry_term_jiff != jiffies) {
  		qpair->retry_term_exchg_addr = entry->exchange_addr_to_abort;
  		qpair->retry_term_cnt = 0;
  		qpair->retry_term_jiff = jiffies;
  	}
  
  	return rc;
  }
  
  
  static void qlt_handle_abts_completion(struct scsi_qla_host *vha,
  	struct rsp_que *rsp, response_t *pkt)
  {
  	struct abts_resp_from_24xx_fw *entry =
  		(struct abts_resp_from_24xx_fw *)pkt;
  	u32 h = pkt->handle & ~QLA_TGT_HANDLE_MASK;
  	struct qla_tgt_mgmt_cmd *mcmd;
  	struct qla_hw_data *ha = vha->hw;
  
  	mcmd = qlt_ctio_to_cmd(vha, rsp, pkt->handle, pkt);
  	if (mcmd == NULL && h != QLA_TGT_SKIP_HANDLE) {
  		ql_dbg(ql_dbg_async, vha, 0xe064,
  		    "qla_target(%d): ABTS Comp without mcmd\n",
  		    vha->vp_idx);
  		return;
  	}
  
  	if (mcmd)
  		vha  = mcmd->vha;
  	vha->vha_tgt.qla_tgt->abts_resp_expected--;
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe038,
  	    "ABTS_RESP_24XX: compl_status %x\n",
  	    entry->compl_status);
  
  	if (le16_to_cpu(entry->compl_status) != ABTS_RESP_COMPL_SUCCESS) {
  		if ((entry->error_subcode1 == 0x1E) &&
  		    (entry->error_subcode2 == 0)) {
  			if (qlt_chk_unresolv_exchg(vha, rsp->qpair, entry)) {
  				ha->tgt.tgt_ops->free_mcmd(mcmd);
  				return;
  			}
  			qlt_24xx_retry_term_exchange(vha, rsp->qpair,
  			    pkt, mcmd);
  		} else {
  			ql_dbg(ql_dbg_tgt, vha, 0xe063,
  			    "qla_target(%d): ABTS_RESP_24XX failed %x (subcode %x:%x)",
  			    vha->vp_idx, entry->compl_status,
  			    entry->error_subcode1,
  			    entry->error_subcode2);
  			ha->tgt.tgt_ops->free_mcmd(mcmd);
  		}
  	} else if (mcmd) {
  		ha->tgt.tgt_ops->free_mcmd(mcmd);
  	}
  }
  
  /* ha->hardware_lock supposed to be held on entry */
  /* called via callback from qla2xxx */
  static void qlt_response_pkt(struct scsi_qla_host *vha,
  	struct rsp_que *rsp, response_t *pkt)
  {
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  
  	if (unlikely(tgt == NULL)) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe05d,
  		    "qla_target(%d): Response pkt %x received, but no tgt (ha %p)\n",
  		    vha->vp_idx, pkt->entry_type, vha->hw);
  		return;
  	}
  
  	/*
  	 * In tgt_stop mode we also should allow all requests to pass.
  	 * Otherwise, some commands can stuck.
  	 */
  
  	switch (pkt->entry_type) {
  	case CTIO_CRC2:
  	case CTIO_TYPE7:
  	{
  		struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
  
  		qlt_do_ctio_completion(vha, rsp, entry->handle,
  		    le16_to_cpu(entry->status)|(pkt->entry_status << 16),
  		    entry);
  		break;
  	}
  
  	case ACCEPT_TGT_IO_TYPE:
  	{
  		struct atio_from_isp *atio = (struct atio_from_isp *)pkt;
  		int rc;
  
  		if (atio->u.isp2x.status !=
  		    cpu_to_le16(ATIO_CDB_VALID)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe05e,
  			    "qla_target(%d): ATIO with error "
  			    "status %x received\n", vha->vp_idx,
  			    le16_to_cpu(atio->u.isp2x.status));
  			break;
  		}
  
  		rc = qlt_chk_qfull_thresh_hold(vha, rsp->qpair, atio, 1);
  		if (rc != 0)
  			return;
  
  		rc = qlt_handle_cmd_for_atio(vha, atio);
  		if (unlikely(rc != 0)) {
  			switch (rc) {
  			case -ENODEV:
  				ql_dbg(ql_dbg_tgt, vha, 0xe05f,
  				    "qla_target: Unable to send command to target\n");
  				break;
  			case -EBADF:
  				ql_dbg(ql_dbg_tgt, vha, 0xe05f,
  				    "qla_target: Unable to send command to target, sending TERM EXCHANGE for rsp\n");
  				qlt_send_term_exchange(rsp->qpair, NULL,
  				    atio, 1, 0);
  				break;
  			case -EBUSY:
  				ql_dbg(ql_dbg_tgt, vha, 0xe060,
  				    "qla_target(%d): Unable to send command to target, sending BUSY status\n",
  				    vha->vp_idx);
  				qlt_send_busy(rsp->qpair, atio,
  				    tc_sam_status);
  				break;
  			default:
  				ql_dbg(ql_dbg_tgt, vha, 0xe060,
  				    "qla_target(%d): Unable to send command to target, sending BUSY status\n",
  				    vha->vp_idx);
  				qlt_send_busy(rsp->qpair, atio,
  				    qla_sam_status);
  				break;
  			}
  		}
  	}
  	break;
  
  	case CONTINUE_TGT_IO_TYPE:
  	{
  		struct ctio_to_2xxx *entry = (struct ctio_to_2xxx *)pkt;
  
  		qlt_do_ctio_completion(vha, rsp, entry->handle,
  		    le16_to_cpu(entry->status)|(pkt->entry_status << 16),
  		    entry);
  		break;
  	}
  
  	case CTIO_A64_TYPE:
  	{
  		struct ctio_to_2xxx *entry = (struct ctio_to_2xxx *)pkt;
  
  		qlt_do_ctio_completion(vha, rsp, entry->handle,
  		    le16_to_cpu(entry->status)|(pkt->entry_status << 16),
  		    entry);
  		break;
  	}
  
  	case IMMED_NOTIFY_TYPE:
  		ql_dbg(ql_dbg_tgt, vha, 0xe035, "%s", "IMMED_NOTIFY\n");
  		qlt_handle_imm_notify(vha, (struct imm_ntfy_from_isp *)pkt);
  		break;
  
  	case NOTIFY_ACK_TYPE:
  		if (tgt->notify_ack_expected > 0) {
  			struct nack_to_isp *entry = (struct nack_to_isp *)pkt;
  
  			ql_dbg(ql_dbg_tgt, vha, 0xe036,
  			    "NOTIFY_ACK seq %08x status %x\n",
  			    le16_to_cpu(entry->u.isp2x.seq_id),
  			    le16_to_cpu(entry->u.isp2x.status));
  			tgt->notify_ack_expected--;
  			if (entry->u.isp2x.status !=
  			    cpu_to_le16(NOTIFY_ACK_SUCCESS)) {
  				ql_dbg(ql_dbg_tgt, vha, 0xe061,
  				    "qla_target(%d): NOTIFY_ACK "
  				    "failed %x\n", vha->vp_idx,
  				    le16_to_cpu(entry->u.isp2x.status));
  			}
  		} else {
  			ql_dbg(ql_dbg_tgt, vha, 0xe062,
  			    "qla_target(%d): Unexpected NOTIFY_ACK received\n",
  			    vha->vp_idx);
  		}
  		break;
  
  	case ABTS_RECV_24XX:
  		ql_dbg(ql_dbg_tgt, vha, 0xe037,
  		    "ABTS_RECV_24XX: instance %d\n", vha->vp_idx);
  		qlt_24xx_handle_abts(vha, (struct abts_recv_from_24xx *)pkt);
  		break;
  
  	case ABTS_RESP_24XX:
  		if (tgt->abts_resp_expected > 0) {
  			qlt_handle_abts_completion(vha, rsp, pkt);
  		} else {
  			ql_dbg(ql_dbg_tgt, vha, 0xe064,
  			    "qla_target(%d): Unexpected ABTS_RESP_24XX "
  			    "received\n", vha->vp_idx);
  		}
  		break;
  
  	default:
  		ql_dbg(ql_dbg_tgt, vha, 0xe065,
  		    "qla_target(%d): Received unknown response pkt "
  		    "type %x\n", vha->vp_idx, pkt->entry_type);
  		break;
  	}
  
  }
  
  /*
   * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
   */
  void qlt_async_event(uint16_t code, struct scsi_qla_host *vha,
  	uint16_t *mailbox)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	int login_code;
  
  	if (!tgt || tgt->tgt_stop || tgt->tgt_stopped)
  		return;
  
  	if (((code == MBA_POINT_TO_POINT) || (code == MBA_CHG_IN_CONNECTION)) &&
  	    IS_QLA2100(ha))
  		return;
  	/*
  	 * In tgt_stop mode we also should allow all requests to pass.
  	 * Otherwise, some commands can stuck.
  	 */
  
  
  	switch (code) {
  	case MBA_RESET:			/* Reset */
  	case MBA_SYSTEM_ERR:		/* System Error */
  	case MBA_REQ_TRANSFER_ERR:	/* Request Transfer Error */
  	case MBA_RSP_TRANSFER_ERR:	/* Response Transfer Error */
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03a,
  		    "qla_target(%d): System error async event %#x "
  		    "occurred", vha->vp_idx, code);
  		break;
  	case MBA_WAKEUP_THRES:		/* Request Queue Wake-up. */
  		set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
  		break;
  
  	case MBA_LOOP_UP:
  	{
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03b,
  		    "qla_target(%d): Async LOOP_UP occurred "
  		    "(m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)", vha->vp_idx,
  		    le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
  		    le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
  		if (tgt->link_reinit_iocb_pending) {
  			qlt_send_notify_ack(ha->base_qpair,
  			    (void *)&tgt->link_reinit_iocb,
  			    0, 0, 0, 0, 0, 0);
  			tgt->link_reinit_iocb_pending = 0;
  		}
  		break;
  	}
  
  	case MBA_LIP_OCCURRED:
  	case MBA_LOOP_DOWN:
  	case MBA_LIP_RESET:
  	case MBA_RSCN_UPDATE:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03c,
  		    "qla_target(%d): Async event %#x occurred "
  		    "(m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)", vha->vp_idx, code,
  		    le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
  		    le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
  		break;
  
  	case MBA_REJECTED_FCP_CMD:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf017,
  		    "qla_target(%d): Async event LS_REJECT occurred (m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)",
  		    vha->vp_idx,
  		    le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
  		    le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
  
  		if (le16_to_cpu(mailbox[3]) == 1) {
  			/* exchange starvation. */
  			vha->hw->exch_starvation++;
  			if (vha->hw->exch_starvation > 5) {
  				ql_log(ql_log_warn, vha, 0xd03a,
  				    "Exchange starvation-. Resetting RISC\n");
  
  				vha->hw->exch_starvation = 0;
  				if (IS_P3P_TYPE(vha->hw))
  					set_bit(FCOE_CTX_RESET_NEEDED,
  					    &vha->dpc_flags);
  				else
  					set_bit(ISP_ABORT_NEEDED,
  					    &vha->dpc_flags);
  				qla2xxx_wake_dpc(vha);
  			}
  		}
  		break;
  
  	case MBA_PORT_UPDATE:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03d,
  		    "qla_target(%d): Port update async event %#x "
  		    "occurred: updating the ports database (m[0]=%x, m[1]=%x, "
  		    "m[2]=%x, m[3]=%x)", vha->vp_idx, code,
  		    le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
  		    le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
  
  		login_code = le16_to_cpu(mailbox[2]);
  		if (login_code == 0x4) {
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03e,
  			    "Async MB 2: Got PLOGI Complete\n");
  			vha->hw->exch_starvation = 0;
  		} else if (login_code == 0x7)
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03f,
  			    "Async MB 2: Port Logged Out\n");
  		break;
  	default:
  		break;
  	}
  
  }
  
  static fc_port_t *qlt_get_port_database(struct scsi_qla_host *vha,
  	uint16_t loop_id)
  {
  	fc_port_t *fcport, *tfcp, *del;
  	int rc;
  	unsigned long flags;
  	u8 newfcport = 0;
  
  	fcport = qla2x00_alloc_fcport(vha, GFP_KERNEL);
  	if (!fcport) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06f,
  		    "qla_target(%d): Allocation of tmp FC port failed",
  		    vha->vp_idx);
  		return NULL;
  	}
  
  	fcport->loop_id = loop_id;
  
  	rc = qla24xx_gpdb_wait(vha, fcport, 0);
  	if (rc != QLA_SUCCESS) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf070,
  		    "qla_target(%d): Failed to retrieve fcport "
  		    "information -- get_port_database() returned %x "
  		    "(loop_id=0x%04x)", vha->vp_idx, rc, loop_id);
  		kfree(fcport);
  		return NULL;
  	}
  
  	del = NULL;
  	spin_lock_irqsave(&vha->hw->tgt.sess_lock, flags);
  	tfcp = qla2x00_find_fcport_by_wwpn(vha, fcport->port_name, 1);
  
  	if (tfcp) {
  		tfcp->d_id = fcport->d_id;
  		tfcp->port_type = fcport->port_type;
  		tfcp->supported_classes = fcport->supported_classes;
  		tfcp->flags |= fcport->flags;
  		tfcp->scan_state = QLA_FCPORT_FOUND;
  
  		del = fcport;
  		fcport = tfcp;
  	} else {
  		if (vha->hw->current_topology == ISP_CFG_F)
  			fcport->flags |= FCF_FABRIC_DEVICE;
  
  		list_add_tail(&fcport->list, &vha->vp_fcports);
  		if (!IS_SW_RESV_ADDR(fcport->d_id))
  		   vha->fcport_count++;
  		fcport->login_gen++;
  		fcport->disc_state = DSC_LOGIN_COMPLETE;
  		fcport->login_succ = 1;
  		newfcport = 1;
  	}
  
  	fcport->deleted = 0;
  	spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);
  
  	switch (vha->host->active_mode) {
  	case MODE_INITIATOR:
  	case MODE_DUAL:
  		if (newfcport) {
  			if (!IS_IIDMA_CAPABLE(vha->hw) || !vha->hw->flags.gpsc_supported) {
  				qla24xx_sched_upd_fcport(fcport);
  			} else {
  				ql_dbg(ql_dbg_disc, vha, 0x20ff,
  				   "%s %d %8phC post gpsc fcp_cnt %d\n",
  				   __func__, __LINE__, fcport->port_name, vha->fcport_count);
  				qla24xx_post_gpsc_work(vha, fcport);
  			}
  		}
  		break;
  
  	case MODE_TARGET:
  	default:
  		break;
  	}
  	if (del)
  		qla2x00_free_fcport(del);
  
  	return fcport;
  }
  
  /* Must be called under tgt_mutex */
  static struct fc_port *qlt_make_local_sess(struct scsi_qla_host *vha,
  					   be_id_t s_id)
  {
  	struct fc_port *sess = NULL;
  	fc_port_t *fcport = NULL;
  	int rc, global_resets;
  	uint16_t loop_id = 0;
  
  	if (s_id.domain == 0xFF && s_id.area == 0xFC) {
  		/*
  		 * This is Domain Controller, so it should be
  		 * OK to drop SCSI commands from it.
  		 */
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf042,
  		    "Unable to find initiator with S_ID %x:%x:%x",
  		    s_id.domain, s_id.area, s_id.al_pa);
  		return NULL;
  	}
  
  	mutex_lock(&vha->vha_tgt.tgt_mutex);
  
  retry:
  	global_resets =
  	    atomic_read(&vha->vha_tgt.qla_tgt->tgt_global_resets_count);
  
  	rc = qla24xx_get_loop_id(vha, s_id, &loop_id);
  	if (rc != 0) {
  		mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  		ql_log(ql_log_info, vha, 0xf071,
  		    "qla_target(%d): Unable to find "
  		    "initiator with S_ID %x:%x:%x",
  		    vha->vp_idx, s_id.domain, s_id.area, s_id.al_pa);
  
  		if (rc == -ENOENT) {
  			qlt_port_logo_t logo;
  
  			logo.id = be_to_port_id(s_id);
  			logo.cmd_count = 1;
  			qlt_send_first_logo(vha, &logo);
  		}
  
  		return NULL;
  	}
  
  	fcport = qlt_get_port_database(vha, loop_id);
  	if (!fcport) {
  		mutex_unlock(&vha->vha_tgt.tgt_mutex);
  		return NULL;
  	}
  
  	if (global_resets !=
  	    atomic_read(&vha->vha_tgt.qla_tgt->tgt_global_resets_count)) {
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf043,
  		    "qla_target(%d): global reset during session discovery "
  		    "(counter was %d, new %d), retrying", vha->vp_idx,
  		    global_resets,
  		    atomic_read(&vha->vha_tgt.
  			qla_tgt->tgt_global_resets_count));
  		goto retry;
  	}
  
  	sess = qlt_create_sess(vha, fcport, true);
  
  	mutex_unlock(&vha->vha_tgt.tgt_mutex);
  
  	return sess;
  }
  
  static void qlt_abort_work(struct qla_tgt *tgt,
  	struct qla_tgt_sess_work_param *prm)
  {
  	struct scsi_qla_host *vha = tgt->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess = NULL;
  	unsigned long flags = 0, flags2 = 0;
  	be_id_t s_id;
  	int rc;
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags2);
  
  	if (tgt->tgt_stop)
  		goto out_term2;
  
  	s_id = le_id_to_be(prm->abts.fcp_hdr_le.s_id);
  
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
  	if (!sess) {
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
  
  		sess = qlt_make_local_sess(vha, s_id);
  		/* sess has got an extra creation ref */
  
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags2);
  		if (!sess)
  			goto out_term2;
  	} else {
  		if (sess->deleted) {
  			sess = NULL;
  			goto out_term2;
  		}
  
  		if (!kref_get_unless_zero(&sess->sess_kref)) {
  			ql_dbg(ql_dbg_tgt_tmr, vha, 0xf01c,
  			    "%s: kref_get fail %8phC \n",
  			     __func__, sess->port_name);
  			sess = NULL;
  			goto out_term2;
  		}
  	}
  
  	rc = __qlt_24xx_handle_abts(vha, &prm->abts, sess);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
  
  	ha->tgt.tgt_ops->put_sess(sess);
  
  	if (rc != 0)
  		goto out_term;
  	return;
  
  out_term2:
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags2);
  
  out_term:
  	spin_lock_irqsave(&ha->hardware_lock, flags);
  	qlt_24xx_send_abts_resp(ha->base_qpair, &prm->abts,
  	    FCP_TMF_REJECTED, false);
  	spin_unlock_irqrestore(&ha->hardware_lock, flags);
  }
  
  static void qlt_tmr_work(struct qla_tgt *tgt,
  	struct qla_tgt_sess_work_param *prm)
  {
  	struct atio_from_isp *a = &prm->tm_iocb2;
  	struct scsi_qla_host *vha = tgt->vha;
  	struct qla_hw_data *ha = vha->hw;
  	struct fc_port *sess;
  	unsigned long flags;
  	be_id_t s_id;
  	int rc;
  	u64 unpacked_lun;
  	int fn;
  	void *iocb;
  
  	spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  
  	if (tgt->tgt_stop)
  		goto out_term2;
  
  	s_id = prm->tm_iocb2.u.isp24.fcp_hdr.s_id;
  	sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
  	if (!sess) {
  		spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  		sess = qlt_make_local_sess(vha, s_id);
  		/* sess has got an extra creation ref */
  
  		spin_lock_irqsave(&ha->tgt.sess_lock, flags);
  		if (!sess)
  			goto out_term2;
  	} else {
  		if (sess->deleted) {
  			goto out_term2;
  		}
  
  		if (!kref_get_unless_zero(&sess->sess_kref)) {
  			ql_dbg(ql_dbg_tgt_tmr, vha, 0xf020,
  			    "%s: kref_get fail %8phC\n",
  			     __func__, sess->port_name);
  			goto out_term2;
  		}
  	}
  
  	iocb = a;
  	fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;
  	unpacked_lun =
  	    scsilun_to_int((struct scsi_lun *)&a->u.isp24.fcp_cmnd.lun);
  
  	rc = qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  
  	ha->tgt.tgt_ops->put_sess(sess);
  
  	if (rc != 0)
  		goto out_term;
  	return;
  
  out_term2:
  	spin_unlock_irqrestore(&ha->tgt.sess_lock, flags);
  out_term:
  	qlt_send_term_exchange(ha->base_qpair, NULL, &prm->tm_iocb2, 1, 0);
  }
  
  static void qlt_sess_work_fn(struct work_struct *work)
  {
  	struct qla_tgt *tgt = container_of(work, struct qla_tgt, sess_work);
  	struct scsi_qla_host *vha = tgt->vha;
  	unsigned long flags;
  
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf000, "Sess work (tgt %p)", tgt);
  
  	spin_lock_irqsave(&tgt->sess_work_lock, flags);
  	while (!list_empty(&tgt->sess_works_list)) {
  		struct qla_tgt_sess_work_param *prm = list_entry(
  		    tgt->sess_works_list.next, typeof(*prm),
  		    sess_works_list_entry);
  
  		/*
  		 * This work can be scheduled on several CPUs at time, so we
  		 * must delete the entry to eliminate double processing
  		 */
  		list_del(&prm->sess_works_list_entry);
  
  		spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
  
  		switch (prm->type) {
  		case QLA_TGT_SESS_WORK_ABORT:
  			qlt_abort_work(tgt, prm);
  			break;
  		case QLA_TGT_SESS_WORK_TM:
  			qlt_tmr_work(tgt, prm);
  			break;
  		default:
  			BUG_ON(1);
  			break;
  		}
  
  		spin_lock_irqsave(&tgt->sess_work_lock, flags);
  
  		kfree(prm);
  	}
  	spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
  }
  
  /* Must be called under tgt_host_action_mutex */
  int qlt_add_target(struct qla_hw_data *ha, struct scsi_qla_host *base_vha)
  {
  	struct qla_tgt *tgt;
  	int rc, i;
  	struct qla_qpair_hint *h;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return 0;
  
  	if (!IS_TGT_MODE_CAPABLE(ha)) {
  		ql_log(ql_log_warn, base_vha, 0xe070,
  		    "This adapter does not support target mode.\n");
  		return 0;
  	}
  
  	ql_dbg(ql_dbg_tgt, base_vha, 0xe03b,
  	    "Registering target for host %ld(%p).\n", base_vha->host_no, ha);
  
  	BUG_ON(base_vha->vha_tgt.qla_tgt != NULL);
  
  	tgt = kzalloc(sizeof(struct qla_tgt), GFP_KERNEL);
  	if (!tgt) {
  		ql_dbg(ql_dbg_tgt, base_vha, 0xe066,
  		    "Unable to allocate struct qla_tgt\n");
  		return -ENOMEM;
  	}
  
  	tgt->qphints = kcalloc(ha->max_qpairs + 1,
  			       sizeof(struct qla_qpair_hint),
  			       GFP_KERNEL);
  	if (!tgt->qphints) {
  		kfree(tgt);
  		ql_log(ql_log_warn, base_vha, 0x0197,
  		    "Unable to allocate qpair hints.\n");
  		return -ENOMEM;
  	}
  
  	if (!(base_vha->host->hostt->supported_mode & MODE_TARGET))
  		base_vha->host->hostt->supported_mode |= MODE_TARGET;
  
  	rc = btree_init64(&tgt->lun_qpair_map);
  	if (rc) {
  		kfree(tgt->qphints);
  		kfree(tgt);
  		ql_log(ql_log_info, base_vha, 0x0198,
  			"Unable to initialize lun_qpair_map btree\n");
  		return -EIO;
  	}
  	h = &tgt->qphints[0];
  	h->qpair = ha->base_qpair;
  	INIT_LIST_HEAD(&h->hint_elem);
  	h->cpuid = ha->base_qpair->cpuid;
  	list_add_tail(&h->hint_elem, &ha->base_qpair->hints_list);
  
  	for (i = 0; i < ha->max_qpairs; i++) {
  		unsigned long flags;
  
  		struct qla_qpair *qpair = ha->queue_pair_map[i];
  
  		h = &tgt->qphints[i + 1];
  		INIT_LIST_HEAD(&h->hint_elem);
  		if (qpair) {
  			h->qpair = qpair;
  			spin_lock_irqsave(qpair->qp_lock_ptr, flags);
  			list_add_tail(&h->hint_elem, &qpair->hints_list);
  			spin_unlock_irqrestore(qpair->qp_lock_ptr, flags);
  			h->cpuid = qpair->cpuid;
  		}
  	}
  
  	tgt->ha = ha;
  	tgt->vha = base_vha;
  	init_waitqueue_head(&tgt->waitQ);
  	INIT_LIST_HEAD(&tgt->del_sess_list);
  	spin_lock_init(&tgt->sess_work_lock);
  	INIT_WORK(&tgt->sess_work, qlt_sess_work_fn);
  	INIT_LIST_HEAD(&tgt->sess_works_list);
  	atomic_set(&tgt->tgt_global_resets_count, 0);
  
  	base_vha->vha_tgt.qla_tgt = tgt;
  
  	ql_dbg(ql_dbg_tgt, base_vha, 0xe067,
  		"qla_target(%d): using 64 Bit PCI addressing",
  		base_vha->vp_idx);
  	/* 3 is reserved */
  	tgt->sg_tablesize = QLA_TGT_MAX_SG_24XX(base_vha->req->length - 3);
  
  	mutex_lock(&qla_tgt_mutex);
  	list_add_tail(&tgt->tgt_list_entry, &qla_tgt_glist);
  	mutex_unlock(&qla_tgt_mutex);
  
  	if (ha->tgt.tgt_ops && ha->tgt.tgt_ops->add_target)
  		ha->tgt.tgt_ops->add_target(base_vha);
  
  	return 0;
  }
  
  /* Must be called under tgt_host_action_mutex */
  int qlt_remove_target(struct qla_hw_data *ha, struct scsi_qla_host *vha)
  {
  	if (!vha->vha_tgt.qla_tgt)
  		return 0;
  
  	if (vha->fc_vport) {
  		qlt_release(vha->vha_tgt.qla_tgt);
  		return 0;
  	}
  
  	/* free left over qfull cmds */
  	qlt_init_term_exchange(vha);
  
  	ql_dbg(ql_dbg_tgt, vha, 0xe03c, "Unregistering target for host %ld(%p)",
  	    vha->host_no, ha);
  	qlt_release(vha->vha_tgt.qla_tgt);
  
  	return 0;
  }
  
  void qlt_remove_target_resources(struct qla_hw_data *ha)
  {
  	struct scsi_qla_host *node;
  	u32 key = 0;
  
  	btree_for_each_safe32(&ha->tgt.host_map, key, node)
  		btree_remove32(&ha->tgt.host_map, key);
  
  	btree_destroy32(&ha->tgt.host_map);
  }
  
  static void qlt_lport_dump(struct scsi_qla_host *vha, u64 wwpn,
  	unsigned char *b)
  {
  	pr_debug("qla2xxx HW vha->node_name: %8phC\n", vha->node_name);
  	pr_debug("qla2xxx HW vha->port_name: %8phC\n", vha->port_name);
  	put_unaligned_be64(wwpn, b);
  	pr_debug("qla2xxx passed configfs WWPN: %8phC\n", b);
  }
  
  /**
   * qla_tgt_lport_register - register lport with external module
   *
   * @target_lport_ptr: pointer for tcm_qla2xxx specific lport data
   * @phys_wwpn: physical port WWPN
   * @npiv_wwpn: NPIV WWPN
   * @npiv_wwnn: NPIV WWNN
   * @callback:  lport initialization callback for tcm_qla2xxx code
   */
  int qlt_lport_register(void *target_lport_ptr, u64 phys_wwpn,
  		       u64 npiv_wwpn, u64 npiv_wwnn,
  		       int (*callback)(struct scsi_qla_host *, void *, u64, u64))
  {
  	struct qla_tgt *tgt;
  	struct scsi_qla_host *vha;
  	struct qla_hw_data *ha;
  	struct Scsi_Host *host;
  	unsigned long flags;
  	int rc;
  	u8 b[WWN_SIZE];
  
  	mutex_lock(&qla_tgt_mutex);
  	list_for_each_entry(tgt, &qla_tgt_glist, tgt_list_entry) {
  		vha = tgt->vha;
  		ha = vha->hw;
  
  		host = vha->host;
  		if (!host)
  			continue;
  
  		if (!(host->hostt->supported_mode & MODE_TARGET))
  			continue;
  
  		if (vha->qlini_mode == QLA2XXX_INI_MODE_ENABLED)
  			continue;
  
  		spin_lock_irqsave(&ha->hardware_lock, flags);
  		if ((!npiv_wwpn || !npiv_wwnn) && host->active_mode & MODE_TARGET) {
  			pr_debug("MODE_TARGET already active on qla2xxx(%d)\n",
  			    host->host_no);
  			spin_unlock_irqrestore(&ha->hardware_lock, flags);
  			continue;
  		}
  		if (tgt->tgt_stop) {
  			pr_debug("MODE_TARGET in shutdown on qla2xxx(%d)\n",
  				 host->host_no);
  			spin_unlock_irqrestore(&ha->hardware_lock, flags);
  			continue;
  		}
  		spin_unlock_irqrestore(&ha->hardware_lock, flags);
  
  		if (!scsi_host_get(host)) {
  			ql_dbg(ql_dbg_tgt, vha, 0xe068,
  			    "Unable to scsi_host_get() for"
  			    " qla2xxx scsi_host\n");
  			continue;
  		}
  		qlt_lport_dump(vha, phys_wwpn, b);
  
  		if (memcmp(vha->port_name, b, WWN_SIZE)) {
  			scsi_host_put(host);
  			continue;
  		}
  		rc = (*callback)(vha, target_lport_ptr, npiv_wwpn, npiv_wwnn);
  		if (rc != 0)
  			scsi_host_put(host);
  
  		mutex_unlock(&qla_tgt_mutex);
  		return rc;
  	}
  	mutex_unlock(&qla_tgt_mutex);
  
  	return -ENODEV;
  }
  EXPORT_SYMBOL(qlt_lport_register);
  
  /**
   * qla_tgt_lport_deregister - Degister lport
   *
   * @vha:  Registered scsi_qla_host pointer
   */
  void qlt_lport_deregister(struct scsi_qla_host *vha)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct Scsi_Host *sh = vha->host;
  	/*
  	 * Clear the target_lport_ptr qla_target_template pointer in qla_hw_data
  	 */
  	vha->vha_tgt.target_lport_ptr = NULL;
  	ha->tgt.tgt_ops = NULL;
  	/*
  	 * Release the Scsi_Host reference for the underlying qla2xxx host
  	 */
  	scsi_host_put(sh);
  }
  EXPORT_SYMBOL(qlt_lport_deregister);
  
  /* Must be called under HW lock */
  void qlt_set_mode(struct scsi_qla_host *vha)
  {
  	switch (vha->qlini_mode) {
  	case QLA2XXX_INI_MODE_DISABLED:
  	case QLA2XXX_INI_MODE_EXCLUSIVE:
  		vha->host->active_mode = MODE_TARGET;
  		break;
  	case QLA2XXX_INI_MODE_ENABLED:
  		vha->host->active_mode = MODE_INITIATOR;
  		break;
  	case QLA2XXX_INI_MODE_DUAL:
  		vha->host->active_mode = MODE_DUAL;
  		break;
  	default:
  		break;
  	}
  }
  
  /* Must be called under HW lock */
  static void qlt_clear_mode(struct scsi_qla_host *vha)
  {
  	switch (vha->qlini_mode) {
  	case QLA2XXX_INI_MODE_DISABLED:
  		vha->host->active_mode = MODE_UNKNOWN;
  		break;
  	case QLA2XXX_INI_MODE_EXCLUSIVE:
  		vha->host->active_mode = MODE_INITIATOR;
  		break;
  	case QLA2XXX_INI_MODE_ENABLED:
  	case QLA2XXX_INI_MODE_DUAL:
  		vha->host->active_mode = MODE_INITIATOR;
  		break;
  	default:
  		break;
  	}
  }
  
  /*
   * qla_tgt_enable_vha - NO LOCK HELD
   *
   * host_reset, bring up w/ Target Mode Enabled
   */
  void
  qlt_enable_vha(struct scsi_qla_host *vha)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	unsigned long flags;
  	scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);
  
  	if (!tgt) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe069,
  		    "Unable to locate qla_tgt pointer from"
  		    " struct qla_hw_data\n");
  		dump_stack();
  		return;
  	}
  	if (vha->qlini_mode == QLA2XXX_INI_MODE_ENABLED)
  		return;
  
  	if (ha->tgt.num_act_qpairs > ha->max_qpairs)
  		ha->tgt.num_act_qpairs = ha->max_qpairs;
  	spin_lock_irqsave(&ha->hardware_lock, flags);
  	tgt->tgt_stopped = 0;
  	qlt_set_mode(vha);
  	spin_unlock_irqrestore(&ha->hardware_lock, flags);
  
  	mutex_lock(&ha->optrom_mutex);
  	ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
  	    "%s.\n", __func__);
  	if (vha->vp_idx) {
  		qla24xx_disable_vp(vha);
  		qla24xx_enable_vp(vha);
  	} else {
  		set_bit(ISP_ABORT_NEEDED, &base_vha->dpc_flags);
  		qla2xxx_wake_dpc(base_vha);
  		WARN_ON_ONCE(qla2x00_wait_for_hba_online(base_vha) !=
  			     QLA_SUCCESS);
  	}
  	mutex_unlock(&ha->optrom_mutex);
  }
  EXPORT_SYMBOL(qlt_enable_vha);
  
  /*
   * qla_tgt_disable_vha - NO LOCK HELD
   *
   * Disable Target Mode and reset the adapter
   */
  static void qlt_disable_vha(struct scsi_qla_host *vha)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_tgt *tgt = vha->vha_tgt.qla_tgt;
  	unsigned long flags;
  
  	if (!tgt) {
  		ql_dbg(ql_dbg_tgt, vha, 0xe06a,
  		    "Unable to locate qla_tgt pointer from"
  		    " struct qla_hw_data\n");
  		dump_stack();
  		return;
  	}
  
  	spin_lock_irqsave(&ha->hardware_lock, flags);
  	qlt_clear_mode(vha);
  	spin_unlock_irqrestore(&ha->hardware_lock, flags);
  
  	set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
  	qla2xxx_wake_dpc(vha);
  	if (qla2x00_wait_for_hba_online(vha) != QLA_SUCCESS)
  		ql_dbg(ql_dbg_tgt, vha, 0xe081,
  		       "qla2x00_wait_for_hba_online() failed\n");
  }
  
  /*
   * Called from qla_init.c:qla24xx_vport_create() contex to setup
   * the target mode specific struct scsi_qla_host and struct qla_hw_data
   * members.
   */
  void
  qlt_vport_create(struct scsi_qla_host *vha, struct qla_hw_data *ha)
  {
  	vha->vha_tgt.qla_tgt = NULL;
  
  	mutex_init(&vha->vha_tgt.tgt_mutex);
  	mutex_init(&vha->vha_tgt.tgt_host_action_mutex);
  
  	qlt_clear_mode(vha);
  
  	/*
  	 * NOTE: Currently the value is kept the same for <24xx and
  	 * >=24xx ISPs. If it is necessary to change it,
  	 * the check should be added for specific ISPs,
  	 * assigning the value appropriately.
  	 */
  	ha->tgt.atio_q_length = ATIO_ENTRY_CNT_24XX;
  
  	qlt_add_target(ha, vha);
  }
  
  u8
  qlt_rff_id(struct scsi_qla_host *vha)
  {
  	u8 fc4_feature = 0;
  	/*
  	 * FC-4 Feature bit 0 indicates target functionality to the name server.
  	 */
  	if (qla_tgt_mode_enabled(vha)) {
  		fc4_feature = BIT_0;
  	} else if (qla_ini_mode_enabled(vha)) {
  		fc4_feature = BIT_1;
  	} else if (qla_dual_mode_enabled(vha))
  		fc4_feature = BIT_0 | BIT_1;
  
  	return fc4_feature;
  }
  
  /*
   * qlt_init_atio_q_entries() - Initializes ATIO queue entries.
   * @ha: HA context
   *
   * Beginning of ATIO ring has initialization control block already built
   * by nvram config routine.
   *
   * Returns 0 on success.
   */
  void
  qlt_init_atio_q_entries(struct scsi_qla_host *vha)
  {
  	struct qla_hw_data *ha = vha->hw;
  	uint16_t cnt;
  	struct atio_from_isp *pkt = (struct atio_from_isp *)ha->tgt.atio_ring;
  
  	if (qla_ini_mode_enabled(vha))
  		return;
  
  	for (cnt = 0; cnt < ha->tgt.atio_q_length; cnt++) {
  		pkt->u.raw.signature = ATIO_PROCESSED;
  		pkt++;
  	}
  
  }
  
  /*
   * qlt_24xx_process_atio_queue() - Process ATIO queue entries.
   * @ha: SCSI driver HA context
   */
  void
  qlt_24xx_process_atio_queue(struct scsi_qla_host *vha, uint8_t ha_locked)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct atio_from_isp *pkt;
  	int cnt, i;
  
  	if (!ha->flags.fw_started)
  		return;
  
  	while ((ha->tgt.atio_ring_ptr->signature != ATIO_PROCESSED) ||
  	    fcpcmd_is_corrupted(ha->tgt.atio_ring_ptr)) {
  		pkt = (struct atio_from_isp *)ha->tgt.atio_ring_ptr;
  		cnt = pkt->u.raw.entry_count;
  
  		if (unlikely(fcpcmd_is_corrupted(ha->tgt.atio_ring_ptr))) {
  			/*
  			 * This packet is corrupted. The header + payload
  			 * can not be trusted. There is no point in passing
  			 * it further up.
  			 */
  			ql_log(ql_log_warn, vha, 0xd03c,
  			    "corrupted fcp frame SID[%3phN] OXID[%04x] EXCG[%x] %64phN\n",
  			    &pkt->u.isp24.fcp_hdr.s_id,
  			    be16_to_cpu(pkt->u.isp24.fcp_hdr.ox_id),
  			    le32_to_cpu(pkt->u.isp24.exchange_addr), pkt);
  
  			adjust_corrupted_atio(pkt);
  			qlt_send_term_exchange(ha->base_qpair, NULL, pkt,
  			    ha_locked, 0);
  		} else {
  			qlt_24xx_atio_pkt_all_vps(vha,
  			    (struct atio_from_isp *)pkt, ha_locked);
  		}
  
  		for (i = 0; i < cnt; i++) {
  			ha->tgt.atio_ring_index++;
  			if (ha->tgt.atio_ring_index == ha->tgt.atio_q_length) {
  				ha->tgt.atio_ring_index = 0;
  				ha->tgt.atio_ring_ptr = ha->tgt.atio_ring;
  			} else
  				ha->tgt.atio_ring_ptr++;
  
  			pkt->u.raw.signature = ATIO_PROCESSED;
  			pkt = (struct atio_from_isp *)ha->tgt.atio_ring_ptr;
  		}
  		wmb();
  	}
  
  	/* Adjust ring index */
  	WRT_REG_DWORD(ISP_ATIO_Q_OUT(vha), ha->tgt.atio_ring_index);
  }
  
  void
  qlt_24xx_config_rings(struct scsi_qla_host *vha)
  {
  	struct qla_hw_data *ha = vha->hw;
  	struct qla_msix_entry *msix = &ha->msix_entries[2];
  	struct init_cb_24xx *icb = (struct init_cb_24xx *)ha->init_cb;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	WRT_REG_DWORD(ISP_ATIO_Q_IN(vha), 0);
  	WRT_REG_DWORD(ISP_ATIO_Q_OUT(vha), 0);
  	RD_REG_DWORD(ISP_ATIO_Q_OUT(vha));
  
  	if (ha->flags.msix_enabled) {
  		if (IS_QLA83XX(ha) || IS_QLA27XX(ha) || IS_QLA28XX(ha)) {
  			if (IS_QLA2071(ha)) {
  				/* 4 ports Baker: Enable Interrupt Handshake */
  				icb->msix_atio = 0;
  				icb->firmware_options_2 |= BIT_26;
  			} else {
  				icb->msix_atio = cpu_to_le16(msix->entry);
  				icb->firmware_options_2 &= ~BIT_26;
  			}
  			ql_dbg(ql_dbg_init, vha, 0xf072,
  			    "Registering ICB vector 0x%x for atio que.\n",
  			    msix->entry);
  		}
  	} else {
  		/* INTx|MSI */
  		if (IS_QLA83XX(ha) || IS_QLA27XX(ha) || IS_QLA28XX(ha)) {
  			icb->msix_atio = 0;
  			icb->firmware_options_2 |= BIT_26;
  			ql_dbg(ql_dbg_init, vha, 0xf072,
  			    "%s: Use INTx for ATIOQ.\n", __func__);
  		}
  	}
  }
  
  void
  qlt_24xx_config_nvram_stage1(struct scsi_qla_host *vha, struct nvram_24xx *nv)
  {
  	struct qla_hw_data *ha = vha->hw;
  	u32 tmp;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if (qla_tgt_mode_enabled(vha) || qla_dual_mode_enabled(vha)) {
  		if (!ha->tgt.saved_set) {
  			/* We save only once */
  			ha->tgt.saved_exchange_count = nv->exchange_count;
  			ha->tgt.saved_firmware_options_1 =
  			    nv->firmware_options_1;
  			ha->tgt.saved_firmware_options_2 =
  			    nv->firmware_options_2;
  			ha->tgt.saved_firmware_options_3 =
  			    nv->firmware_options_3;
  			ha->tgt.saved_set = 1;
  		}
  
  		if (qla_tgt_mode_enabled(vha))
  			nv->exchange_count = cpu_to_le16(0xFFFF);
  		else			/* dual */
  			nv->exchange_count = cpu_to_le16(vha->ql2xexchoffld);
  
  		/* Enable target mode */
  		nv->firmware_options_1 |= cpu_to_le32(BIT_4);
  
  		/* Disable ini mode, if requested */
  		if (qla_tgt_mode_enabled(vha))
  			nv->firmware_options_1 |= cpu_to_le32(BIT_5);
  
  		/* Disable Full Login after LIP */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_13);
  		/* Enable initial LIP */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_9);
  		if (ql2xtgt_tape_enable)
  			/* Enable FC Tape support */
  			nv->firmware_options_2 |= cpu_to_le32(BIT_12);
  		else
  			/* Disable FC Tape support */
  			nv->firmware_options_2 &= cpu_to_le32(~BIT_12);
  
  		/* Disable Full Login after LIP */
  		nv->host_p &= cpu_to_le32(~BIT_10);
  
  		/*
  		 * clear BIT 15 explicitly as we have seen at least
  		 * a couple of instances where this was set and this
  		 * was causing the firmware to not be initialized.
  		 */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_15);
  		/* Enable target PRLI control */
  		nv->firmware_options_2 |= cpu_to_le32(BIT_14);
  
  		if (IS_QLA25XX(ha)) {
  			/* Change Loop-prefer to Pt-Pt */
  			tmp = ~(BIT_4|BIT_5|BIT_6);
  			nv->firmware_options_2 &= cpu_to_le32(tmp);
  			tmp = P2P << 4;
  			nv->firmware_options_2 |= cpu_to_le32(tmp);
  		}
  	} else {
  		if (ha->tgt.saved_set) {
  			nv->exchange_count = ha->tgt.saved_exchange_count;
  			nv->firmware_options_1 =
  			    ha->tgt.saved_firmware_options_1;
  			nv->firmware_options_2 =
  			    ha->tgt.saved_firmware_options_2;
  			nv->firmware_options_3 =
  			    ha->tgt.saved_firmware_options_3;
  		}
  		return;
  	}
  
  	if (ha->base_qpair->enable_class_2) {
  		if (vha->flags.init_done)
  			fc_host_supported_classes(vha->host) =
  				FC_COS_CLASS2 | FC_COS_CLASS3;
  
  		nv->firmware_options_2 |= cpu_to_le32(BIT_8);
  	} else {
  		if (vha->flags.init_done)
  			fc_host_supported_classes(vha->host) = FC_COS_CLASS3;
  
  		nv->firmware_options_2 &= ~cpu_to_le32(BIT_8);
  	}
  }
  
  void
  qlt_24xx_config_nvram_stage2(struct scsi_qla_host *vha,
  	struct init_cb_24xx *icb)
  {
  	struct qla_hw_data *ha = vha->hw;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if (ha->tgt.node_name_set) {
  		memcpy(icb->node_name, ha->tgt.tgt_node_name, WWN_SIZE);
  		icb->firmware_options_1 |= cpu_to_le32(BIT_14);
  	}
  }
  
  void
  qlt_81xx_config_nvram_stage1(struct scsi_qla_host *vha, struct nvram_81xx *nv)
  {
  	struct qla_hw_data *ha = vha->hw;
  	u32 tmp;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if (qla_tgt_mode_enabled(vha) || qla_dual_mode_enabled(vha)) {
  		if (!ha->tgt.saved_set) {
  			/* We save only once */
  			ha->tgt.saved_exchange_count = nv->exchange_count;
  			ha->tgt.saved_firmware_options_1 =
  			    nv->firmware_options_1;
  			ha->tgt.saved_firmware_options_2 =
  			    nv->firmware_options_2;
  			ha->tgt.saved_firmware_options_3 =
  			    nv->firmware_options_3;
  			ha->tgt.saved_set = 1;
  		}
  
  		if (qla_tgt_mode_enabled(vha))
  			nv->exchange_count = cpu_to_le16(0xFFFF);
  		else			/* dual */
  			nv->exchange_count = cpu_to_le16(vha->ql2xexchoffld);
  
  		/* Enable target mode */
  		nv->firmware_options_1 |= cpu_to_le32(BIT_4);
  
  		/* Disable ini mode, if requested */
  		if (qla_tgt_mode_enabled(vha))
  			nv->firmware_options_1 |= cpu_to_le32(BIT_5);
  		/* Disable Full Login after LIP */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_13);
  		/* Enable initial LIP */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_9);
  		/*
  		 * clear BIT 15 explicitly as we have seen at
  		 * least a couple of instances where this was set
  		 * and this was causing the firmware to not be
  		 * initialized.
  		 */
  		nv->firmware_options_1 &= cpu_to_le32(~BIT_15);
  		if (ql2xtgt_tape_enable)
  			/* Enable FC tape support */
  			nv->firmware_options_2 |= cpu_to_le32(BIT_12);
  		else
  			/* Disable FC tape support */
  			nv->firmware_options_2 &= cpu_to_le32(~BIT_12);
  
  		/* Disable Full Login after LIP */
  		nv->host_p &= cpu_to_le32(~BIT_10);
  		/* Enable target PRLI control */
  		nv->firmware_options_2 |= cpu_to_le32(BIT_14);
  
  		/* Change Loop-prefer to Pt-Pt */
  		tmp = ~(BIT_4|BIT_5|BIT_6);
  		nv->firmware_options_2 &= cpu_to_le32(tmp);
  		tmp = P2P << 4;
  		nv->firmware_options_2 |= cpu_to_le32(tmp);
  	} else {
  		if (ha->tgt.saved_set) {
  			nv->exchange_count = ha->tgt.saved_exchange_count;
  			nv->firmware_options_1 =
  			    ha->tgt.saved_firmware_options_1;
  			nv->firmware_options_2 =
  			    ha->tgt.saved_firmware_options_2;
  			nv->firmware_options_3 =
  			    ha->tgt.saved_firmware_options_3;
  		}
  		return;
  	}
  
  	if (ha->base_qpair->enable_class_2) {
  		if (vha->flags.init_done)
  			fc_host_supported_classes(vha->host) =
  				FC_COS_CLASS2 | FC_COS_CLASS3;
  
  		nv->firmware_options_2 |= cpu_to_le32(BIT_8);
  	} else {
  		if (vha->flags.init_done)
  			fc_host_supported_classes(vha->host) = FC_COS_CLASS3;
  
  		nv->firmware_options_2 &= ~cpu_to_le32(BIT_8);
  	}
  }
  
  void
  qlt_81xx_config_nvram_stage2(struct scsi_qla_host *vha,
  	struct init_cb_81xx *icb)
  {
  	struct qla_hw_data *ha = vha->hw;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if (ha->tgt.node_name_set) {
  		memcpy(icb->node_name, ha->tgt.tgt_node_name, WWN_SIZE);
  		icb->firmware_options_1 |= cpu_to_le32(BIT_14);
  	}
  }
  
  void
  qlt_83xx_iospace_config(struct qla_hw_data *ha)
  {
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	ha->msix_count += 1; /* For ATIO Q */
  }
  
  
  void
  qlt_modify_vp_config(struct scsi_qla_host *vha,
  	struct vp_config_entry_24xx *vpmod)
  {
  	/* enable target mode.  Bit5 = 1 => disable */
  	if (qla_tgt_mode_enabled(vha) || qla_dual_mode_enabled(vha))
  		vpmod->options_idx1 &= ~BIT_5;
  
  	/* Disable ini mode, if requested.  bit4 = 1 => disable */
  	if (qla_tgt_mode_enabled(vha))
  		vpmod->options_idx1 &= ~BIT_4;
  }
  
  void
  qlt_probe_one_stage1(struct scsi_qla_host *base_vha, struct qla_hw_data *ha)
  {
  	int rc;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if  ((ql2xenablemsix == 0) || IS_QLA83XX(ha) || IS_QLA27XX(ha) ||
  	    IS_QLA28XX(ha)) {
  		ISP_ATIO_Q_IN(base_vha) = &ha->mqiobase->isp25mq.atio_q_in;
  		ISP_ATIO_Q_OUT(base_vha) = &ha->mqiobase->isp25mq.atio_q_out;
  	} else {
  		ISP_ATIO_Q_IN(base_vha) = &ha->iobase->isp24.atio_q_in;
  		ISP_ATIO_Q_OUT(base_vha) = &ha->iobase->isp24.atio_q_out;
  	}
  
  	mutex_init(&base_vha->vha_tgt.tgt_mutex);
  	mutex_init(&base_vha->vha_tgt.tgt_host_action_mutex);
  
  	INIT_LIST_HEAD(&base_vha->unknown_atio_list);
  	INIT_DELAYED_WORK(&base_vha->unknown_atio_work,
  	    qlt_unknown_atio_work_fn);
  
  	qlt_clear_mode(base_vha);
  
  	rc = btree_init32(&ha->tgt.host_map);
  	if (rc)
  		ql_log(ql_log_info, base_vha, 0xd03d,
  		    "Unable to initialize ha->host_map btree\n");
  
  	qlt_update_vp_map(base_vha, SET_VP_IDX);
  }
  
  irqreturn_t
  qla83xx_msix_atio_q(int irq, void *dev_id)
  {
  	struct rsp_que *rsp;
  	scsi_qla_host_t	*vha;
  	struct qla_hw_data *ha;
  	unsigned long flags;
  
  	rsp = (struct rsp_que *) dev_id;
  	ha = rsp->hw;
  	vha = pci_get_drvdata(ha->pdev);
  
  	spin_lock_irqsave(&ha->tgt.atio_lock, flags);
  
  	qlt_24xx_process_atio_queue(vha, 0);
  
  	spin_unlock_irqrestore(&ha->tgt.atio_lock, flags);
  
  	return IRQ_HANDLED;
  }
  
  static void
  qlt_handle_abts_recv_work(struct work_struct *work)
  {
  	struct qla_tgt_sess_op *op = container_of(work,
  		struct qla_tgt_sess_op, work);
  	scsi_qla_host_t *vha = op->vha;
  	struct qla_hw_data *ha = vha->hw;
  	unsigned long flags;
  
  	if (qla2x00_reset_active(vha) ||
  	    (op->chip_reset != ha->base_qpair->chip_reset))
  		return;
  
  	spin_lock_irqsave(&ha->tgt.atio_lock, flags);
  	qlt_24xx_process_atio_queue(vha, 0);
  	spin_unlock_irqrestore(&ha->tgt.atio_lock, flags);
  
  	spin_lock_irqsave(&ha->hardware_lock, flags);
  	qlt_response_pkt_all_vps(vha, op->rsp, (response_t *)&op->atio);
  	spin_unlock_irqrestore(&ha->hardware_lock, flags);
  
  	kfree(op);
  }
  
  void
  qlt_handle_abts_recv(struct scsi_qla_host *vha, struct rsp_que *rsp,
      response_t *pkt)
  {
  	struct qla_tgt_sess_op *op;
  
  	op = kzalloc(sizeof(*op), GFP_ATOMIC);
  
  	if (!op) {
  		/* do not reach for ATIO queue here.  This is best effort err
  		 * recovery at this point.
  		 */
  		qlt_response_pkt_all_vps(vha, rsp, pkt);
  		return;
  	}
  
  	memcpy(&op->atio, pkt, sizeof(*pkt));
  	op->vha = vha;
  	op->chip_reset = vha->hw->base_qpair->chip_reset;
  	op->rsp = rsp;
  	INIT_WORK(&op->work, qlt_handle_abts_recv_work);
  	queue_work(qla_tgt_wq, &op->work);
  	return;
  }
  
  int
  qlt_mem_alloc(struct qla_hw_data *ha)
  {
  	if (!QLA_TGT_MODE_ENABLED())
  		return 0;
  
  	ha->tgt.tgt_vp_map = kcalloc(MAX_MULTI_ID_FABRIC,
  				     sizeof(struct qla_tgt_vp_map),
  				     GFP_KERNEL);
  	if (!ha->tgt.tgt_vp_map)
  		return -ENOMEM;
  
  	ha->tgt.atio_ring = dma_alloc_coherent(&ha->pdev->dev,
  	    (ha->tgt.atio_q_length + 1) * sizeof(struct atio_from_isp),
  	    &ha->tgt.atio_dma, GFP_KERNEL);
  	if (!ha->tgt.atio_ring) {
  		kfree(ha->tgt.tgt_vp_map);
  		return -ENOMEM;
  	}
  	return 0;
  }
  
  void
  qlt_mem_free(struct qla_hw_data *ha)
  {
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	if (ha->tgt.atio_ring) {
  		dma_free_coherent(&ha->pdev->dev, (ha->tgt.atio_q_length + 1) *
  		    sizeof(struct atio_from_isp), ha->tgt.atio_ring,
  		    ha->tgt.atio_dma);
  	}
  	ha->tgt.atio_ring = NULL;
  	ha->tgt.atio_dma = 0;
  	kfree(ha->tgt.tgt_vp_map);
  	ha->tgt.tgt_vp_map = NULL;
  }
  
  /* vport_slock to be held by the caller */
  void
  qlt_update_vp_map(struct scsi_qla_host *vha, int cmd)
  {
  	void *slot;
  	u32 key;
  	int rc;
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	key = vha->d_id.b24;
  
  	switch (cmd) {
  	case SET_VP_IDX:
  		vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = vha;
  		break;
  	case SET_AL_PA:
  		slot = btree_lookup32(&vha->hw->tgt.host_map, key);
  		if (!slot) {
  			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf018,
  			    "Save vha in host_map %p %06x\n", vha, key);
  			rc = btree_insert32(&vha->hw->tgt.host_map,
  				key, vha, GFP_ATOMIC);
  			if (rc)
  				ql_log(ql_log_info, vha, 0xd03e,
  				    "Unable to insert s_id into host_map: %06x\n",
  				    key);
  			return;
  		}
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf019,
  		    "replace existing vha in host_map %p %06x\n", vha, key);
  		btree_update32(&vha->hw->tgt.host_map, key, vha);
  		break;
  	case RESET_VP_IDX:
  		vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = NULL;
  		break;
  	case RESET_AL_PA:
  		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01a,
  		   "clear vha in host_map %p %06x\n", vha, key);
  		slot = btree_lookup32(&vha->hw->tgt.host_map, key);
  		if (slot)
  			btree_remove32(&vha->hw->tgt.host_map, key);
  		vha->d_id.b24 = 0;
  		break;
  	}
  }
  
  void qlt_update_host_map(struct scsi_qla_host *vha, port_id_t id)
  {
  
  	if (!vha->d_id.b24) {
  		vha->d_id = id;
  		qlt_update_vp_map(vha, SET_AL_PA);
  	} else if (vha->d_id.b24 != id.b24) {
  		qlt_update_vp_map(vha, RESET_AL_PA);
  		vha->d_id = id;
  		qlt_update_vp_map(vha, SET_AL_PA);
  	}
  }
  
  static int __init qlt_parse_ini_mode(void)
  {
  	if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_EXCLUSIVE) == 0)
  		ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
  	else if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_DISABLED) == 0)
  		ql2x_ini_mode = QLA2XXX_INI_MODE_DISABLED;
  	else if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_ENABLED) == 0)
  		ql2x_ini_mode = QLA2XXX_INI_MODE_ENABLED;
  	else if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_DUAL) == 0)
  		ql2x_ini_mode = QLA2XXX_INI_MODE_DUAL;
  	else
  		return false;
  
  	return true;
  }
  
  int __init qlt_init(void)
  {
  	int ret;
  
  	BUILD_BUG_ON(sizeof(struct ctio7_to_24xx) != 64);
  	BUILD_BUG_ON(sizeof(struct ctio_to_2xxx) != 64);
  
  	if (!qlt_parse_ini_mode()) {
  		ql_log(ql_log_fatal, NULL, 0xe06b,
  		    "qlt_parse_ini_mode() failed\n");
  		return -EINVAL;
  	}
  
  	if (!QLA_TGT_MODE_ENABLED())
  		return 0;
  
  	qla_tgt_mgmt_cmd_cachep = kmem_cache_create("qla_tgt_mgmt_cmd_cachep",
  	    sizeof(struct qla_tgt_mgmt_cmd), __alignof__(struct
  	    qla_tgt_mgmt_cmd), 0, NULL);
  	if (!qla_tgt_mgmt_cmd_cachep) {
  		ql_log(ql_log_fatal, NULL, 0xd04b,
  		    "kmem_cache_create for qla_tgt_mgmt_cmd_cachep failed\n");
  		return -ENOMEM;
  	}
  
  	qla_tgt_plogi_cachep = kmem_cache_create("qla_tgt_plogi_cachep",
  	    sizeof(struct qlt_plogi_ack_t), __alignof__(struct qlt_plogi_ack_t),
  	    0, NULL);
  
  	if (!qla_tgt_plogi_cachep) {
  		ql_log(ql_log_fatal, NULL, 0xe06d,
  		    "kmem_cache_create for qla_tgt_plogi_cachep failed\n");
  		ret = -ENOMEM;
  		goto out_mgmt_cmd_cachep;
  	}
  
  	qla_tgt_mgmt_cmd_mempool = mempool_create(25, mempool_alloc_slab,
  	    mempool_free_slab, qla_tgt_mgmt_cmd_cachep);
  	if (!qla_tgt_mgmt_cmd_mempool) {
  		ql_log(ql_log_fatal, NULL, 0xe06e,
  		    "mempool_create for qla_tgt_mgmt_cmd_mempool failed\n");
  		ret = -ENOMEM;
  		goto out_plogi_cachep;
  	}
  
  	qla_tgt_wq = alloc_workqueue("qla_tgt_wq", 0, 0);
  	if (!qla_tgt_wq) {
  		ql_log(ql_log_fatal, NULL, 0xe06f,
  		    "alloc_workqueue for qla_tgt_wq failed\n");
  		ret = -ENOMEM;
  		goto out_cmd_mempool;
  	}
  	/*
  	 * Return 1 to signal that initiator-mode is being disabled
  	 */
  	return (ql2x_ini_mode == QLA2XXX_INI_MODE_DISABLED) ? 1 : 0;
  
  out_cmd_mempool:
  	mempool_destroy(qla_tgt_mgmt_cmd_mempool);
  out_plogi_cachep:
  	kmem_cache_destroy(qla_tgt_plogi_cachep);
  out_mgmt_cmd_cachep:
  	kmem_cache_destroy(qla_tgt_mgmt_cmd_cachep);
  	return ret;
  }
  
  void qlt_exit(void)
  {
  	if (!QLA_TGT_MODE_ENABLED())
  		return;
  
  	destroy_workqueue(qla_tgt_wq);
  	mempool_destroy(qla_tgt_mgmt_cmd_mempool);
  	kmem_cache_destroy(qla_tgt_plogi_cachep);
  	kmem_cache_destroy(qla_tgt_mgmt_cmd_cachep);
  }
  