text: /*
   * cxgb4i.c: Chelsio T4 iSCSI driver.
   *
   * Copyright (c) 2010-2015 Chelsio Communications, Inc.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation.
   *
   * Written by:	Karen Xie (kxie@chelsio.com)
   *		Rakesh Ranjan (rranjan@chelsio.com)
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <scsi/scsi_host.h>
  #include <net/tcp.h>
  #include <net/dst.h>
  #include <linux/netdevice.h>
  #include <net/addrconf.h>
  
  #include "t4_regs.h"
  #include "t4_msg.h"
  #include "cxgb4.h"
  #include "cxgb4_uld.h"
  #include "t4fw_api.h"
  #include "l2t.h"
  #include "cxgb4i.h"
  #include "clip_tbl.h"
  
  static unsigned int dbg_level;
  
  #include "../libcxgbi.h"
  
  #define	DRV_MODULE_NAME		"cxgb4i"
  #define DRV_MODULE_DESC		"Chelsio T4/T5 iSCSI Driver"
  #define	DRV_MODULE_VERSION	"0.9.5-ko"
  #define DRV_MODULE_RELDATE	"Apr. 2015"
  
  static char version[] =
  	DRV_MODULE_DESC " " DRV_MODULE_NAME
  	" v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
  
  MODULE_AUTHOR("Chelsio Communications, Inc.");
  MODULE_DESCRIPTION(DRV_MODULE_DESC);
  MODULE_VERSION(DRV_MODULE_VERSION);
  MODULE_LICENSE("GPL");
  
  module_param(dbg_level, uint, 0644);
  MODULE_PARM_DESC(dbg_level, "Debug flag (default=0)");
  
  #define CXGB4I_DEFAULT_10G_RCV_WIN (256 * 1024)
  static int cxgb4i_rcv_win = -1;
  module_param(cxgb4i_rcv_win, int, 0644);
  MODULE_PARM_DESC(cxgb4i_rcv_win, "TCP reveive window in bytes");
  
  #define CXGB4I_DEFAULT_10G_SND_WIN (128 * 1024)
  static int cxgb4i_snd_win = -1;
  module_param(cxgb4i_snd_win, int, 0644);
  MODULE_PARM_DESC(cxgb4i_snd_win, "TCP send window in bytes");
  
  static int cxgb4i_rx_credit_thres = 10 * 1024;
  module_param(cxgb4i_rx_credit_thres, int, 0644);
  MODULE_PARM_DESC(cxgb4i_rx_credit_thres,
  		"RX credits return threshold in bytes (default=10KB)");
  
  static unsigned int cxgb4i_max_connect = (8 * 1024);
  module_param(cxgb4i_max_connect, uint, 0644);
  MODULE_PARM_DESC(cxgb4i_max_connect, "Maximum number of connections");
  
  static unsigned short cxgb4i_sport_base = 20000;
  module_param(cxgb4i_sport_base, ushort, 0644);
  MODULE_PARM_DESC(cxgb4i_sport_base, "Starting port number (default 20000)");
  
  typedef void (*cxgb4i_cplhandler_func)(struct cxgbi_device *, struct sk_buff *);
  
  static void *t4_uld_add(const struct cxgb4_lld_info *);
  static int t4_uld_rx_handler(void *, const __be64 *, const struct pkt_gl *);
  static int t4_uld_state_change(void *, enum cxgb4_state state);
  static inline int send_tx_flowc_wr(struct cxgbi_sock *);
  
  static const struct cxgb4_uld_info cxgb4i_uld_info = {
  	.name = DRV_MODULE_NAME,
  	.nrxq = MAX_ULD_QSETS,
  	.rxq_size = 1024,
  	.lro = false,
  	.add = t4_uld_add,
  	.rx_handler = t4_uld_rx_handler,
  	.state_change = t4_uld_state_change,
  };
  
  static struct scsi_host_template cxgb4i_host_template = {
  	.module		= THIS_MODULE,
  	.name		= DRV_MODULE_NAME,
  	.proc_name	= DRV_MODULE_NAME,
  	.can_queue	= CXGB4I_SCSI_HOST_QDEPTH,
  	.queuecommand	= iscsi_queuecommand,
  	.change_queue_depth = scsi_change_queue_depth,
  	.sg_tablesize	= SG_ALL,
  	.max_sectors	= 0xFFFF,
  	.cmd_per_lun	= ISCSI_DEF_CMD_PER_LUN,
  	.eh_abort_handler = iscsi_eh_abort,
  	.eh_device_reset_handler = iscsi_eh_device_reset,
  	.eh_target_reset_handler = iscsi_eh_recover_target,
  	.target_alloc	= iscsi_target_alloc,
  	.use_clustering	= DISABLE_CLUSTERING,
  	.this_id	= -1,
  	.track_queue_depth = 1,
  };
  
  static struct iscsi_transport cxgb4i_iscsi_transport = {
  	.owner		= THIS_MODULE,
  	.name		= DRV_MODULE_NAME,
  	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
  				CAP_DATADGST | CAP_DIGEST_OFFLOAD |
  				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
  	.attr_is_visible	= cxgbi_attr_is_visible,
  	.get_host_param	= cxgbi_get_host_param,
  	.set_host_param	= cxgbi_set_host_param,
  	/* session management */
  	.create_session	= cxgbi_create_session,
  	.destroy_session	= cxgbi_destroy_session,
  	.get_session_param = iscsi_session_get_param,
  	/* connection management */
  	.create_conn	= cxgbi_create_conn,
  	.bind_conn		= cxgbi_bind_conn,
  	.destroy_conn	= iscsi_tcp_conn_teardown,
  	.start_conn		= iscsi_conn_start,
  	.stop_conn		= iscsi_conn_stop,
  	.get_conn_param	= iscsi_conn_get_param,
  	.set_param	= cxgbi_set_conn_param,
  	.get_stats	= cxgbi_get_conn_stats,
  	/* pdu xmit req from user space */
  	.send_pdu	= iscsi_conn_send_pdu,
  	/* task */
  	.init_task	= iscsi_tcp_task_init,
  	.xmit_task	= iscsi_tcp_task_xmit,
  	.cleanup_task	= cxgbi_cleanup_task,
  	/* pdu */
  	.alloc_pdu	= cxgbi_conn_alloc_pdu,
  	.init_pdu	= cxgbi_conn_init_pdu,
  	.xmit_pdu	= cxgbi_conn_xmit_pdu,
  	.parse_pdu_itt	= cxgbi_parse_pdu_itt,
  	/* TCP connect/disconnect */
  	.get_ep_param	= cxgbi_get_ep_param,
  	.ep_connect	= cxgbi_ep_connect,
  	.ep_poll	= cxgbi_ep_poll,
  	.ep_disconnect	= cxgbi_ep_disconnect,
  	/* Error recovery timeout call */
  	.session_recovery_timedout = iscsi_session_recovery_timedout,
  };
  
  static struct scsi_transport_template *cxgb4i_stt;
  
  /*
   * CPL (Chelsio Protocol Language) defines a message passing interface between
   * the host driver and Chelsio asic.
   * The section below implments CPLs that related to iscsi tcp connection
   * open/close/abort and data send/receive.
   */
  
  #define RCV_BUFSIZ_MASK		0x3FFU
  #define MAX_IMM_TX_PKT_LEN	256
  
  static int push_tx_frames(struct cxgbi_sock *, int);
  
  /*
   * is_ofld_imm - check whether a packet can be sent as immediate data
   * @skb: the packet
   *
   * Returns true if a packet can be sent as an offload WR with immediate
   * data.  We currently use the same limit as for Ethernet packets.
   */
  static inline bool is_ofld_imm(const struct sk_buff *skb)
  {
  	int len = skb->len;
  
  	if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
  		len += sizeof(struct fw_ofld_tx_data_wr);
  
  	return len <= MAX_IMM_TX_PKT_LEN;
  }
  
  static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
  				struct l2t_entry *e)
  {
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
  	int t4 = is_t4(lldi->adapter_type);
  	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
  	unsigned long long opt0;
  	unsigned int opt2;
  	unsigned int qid_atid = ((unsigned int)csk->atid) |
  				 (((unsigned int)csk->rss_qid) << 14);
  
  	opt0 = KEEP_ALIVE_F |
  		WND_SCALE_V(wscale) |
  		MSS_IDX_V(csk->mss_idx) |
  		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
  		TX_CHAN_V(csk->tx_chan) |
  		SMAC_SEL_V(csk->smac_idx) |
  		ULP_MODE_V(ULP_MODE_ISCSI) |
  		RCV_BUFSIZ_V(csk->rcv_win >> 10);
  
  	opt2 = RX_CHANNEL_V(0) |
  		RSS_QUEUE_VALID_F |
  		RSS_QUEUE_V(csk->rss_qid);
  
  	if (is_t4(lldi->adapter_type)) {
  		struct cpl_act_open_req *req =
  				(struct cpl_act_open_req *)skb->head;
  
  		INIT_TP_WR(req, 0);
  		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
  					qid_atid));
  		req->local_port = csk->saddr.sin_port;
  		req->peer_port = csk->daddr.sin_port;
  		req->local_ip = csk->saddr.sin_addr.s_addr;
  		req->peer_ip = csk->daddr.sin_addr.s_addr;
  		req->opt0 = cpu_to_be64(opt0);
  		req->params = cpu_to_be32(cxgb4_select_ntuple(
  					csk->cdev->ports[csk->port_id],
  					csk->l2t));
  		opt2 |= RX_FC_VALID_F;
  		req->opt2 = cpu_to_be32(opt2);
  
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  			"csk t4 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
  			csk, &req->local_ip, ntohs(req->local_port),
  			&req->peer_ip, ntohs(req->peer_port),
  			csk->atid, csk->rss_qid);
  	} else {
  		struct cpl_t5_act_open_req *req =
  				(struct cpl_t5_act_open_req *)skb->head;
  		u32 isn = (prandom_u32() & ~7UL) - 1;
  
  		INIT_TP_WR(req, 0);
  		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ,
  					qid_atid));
  		req->local_port = csk->saddr.sin_port;
  		req->peer_port = csk->daddr.sin_port;
  		req->local_ip = csk->saddr.sin_addr.s_addr;
  		req->peer_ip = csk->daddr.sin_addr.s_addr;
  		req->opt0 = cpu_to_be64(opt0);
  		req->params = cpu_to_be64(FILTER_TUPLE_V(
  				cxgb4_select_ntuple(
  					csk->cdev->ports[csk->port_id],
  					csk->l2t)));
  		req->rsvd = cpu_to_be32(isn);
  		opt2 |= T5_ISS_VALID;
  		opt2 |= T5_OPT_2_VALID_F;
  
  		req->opt2 = cpu_to_be32(opt2);
  
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  			"csk t5 0x%p, %pI4:%u-%pI4:%u, atid %d, qid %u.\n",
  			csk, &req->local_ip, ntohs(req->local_port),
  			&req->peer_ip, ntohs(req->peer_port),
  			csk->atid, csk->rss_qid);
  	}
  
  	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
  
  	pr_info_ipaddr("t%d csk 0x%p,%u,0x%lx,%u, rss_qid %u.\n",
  		       (&csk->saddr), (&csk->daddr), t4 ? 4 : 5, csk,
  		       csk->state, csk->flags, csk->atid, csk->rss_qid);
  
  	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
  }
  
  #if IS_ENABLED(CONFIG_IPV6)
  static void send_act_open_req6(struct cxgbi_sock *csk, struct sk_buff *skb,
  			       struct l2t_entry *e)
  {
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
  	int t4 = is_t4(lldi->adapter_type);
  	int wscale = cxgbi_sock_compute_wscale(csk->mss_idx);
  	unsigned long long opt0;
  	unsigned int opt2;
  	unsigned int qid_atid = ((unsigned int)csk->atid) |
  				 (((unsigned int)csk->rss_qid) << 14);
  
  	opt0 = KEEP_ALIVE_F |
  		WND_SCALE_V(wscale) |
  		MSS_IDX_V(csk->mss_idx) |
  		L2T_IDX_V(((struct l2t_entry *)csk->l2t)->idx) |
  		TX_CHAN_V(csk->tx_chan) |
  		SMAC_SEL_V(csk->smac_idx) |
  		ULP_MODE_V(ULP_MODE_ISCSI) |
  		RCV_BUFSIZ_V(csk->rcv_win >> 10);
  
  	opt2 = RX_CHANNEL_V(0) |
  		RSS_QUEUE_VALID_F |
  		RX_FC_DISABLE_F |
  		RSS_QUEUE_V(csk->rss_qid);
  
  	if (t4) {
  		struct cpl_act_open_req6 *req =
  			    (struct cpl_act_open_req6 *)skb->head;
  
  		INIT_TP_WR(req, 0);
  		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
  							    qid_atid));
  		req->local_port = csk->saddr6.sin6_port;
  		req->peer_port = csk->daddr6.sin6_port;
  
  		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
  		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
  								    8);
  		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
  		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
  								    8);
  
  		req->opt0 = cpu_to_be64(opt0);
  
  		opt2 |= RX_FC_VALID_F;
  		req->opt2 = cpu_to_be32(opt2);
  
  		req->params = cpu_to_be32(cxgb4_select_ntuple(
  					  csk->cdev->ports[csk->port_id],
  					  csk->l2t));
  	} else {
  		struct cpl_t5_act_open_req6 *req =
  				(struct cpl_t5_act_open_req6 *)skb->head;
  
  		INIT_TP_WR(req, 0);
  		OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ACT_OPEN_REQ6,
  							    qid_atid));
  		req->local_port = csk->saddr6.sin6_port;
  		req->peer_port = csk->daddr6.sin6_port;
  		req->local_ip_hi = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr);
  		req->local_ip_lo = *(__be64 *)(csk->saddr6.sin6_addr.s6_addr +
  									8);
  		req->peer_ip_hi = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr);
  		req->peer_ip_lo = *(__be64 *)(csk->daddr6.sin6_addr.s6_addr +
  									8);
  		req->opt0 = cpu_to_be64(opt0);
  
  		opt2 |= T5_OPT_2_VALID_F;
  		req->opt2 = cpu_to_be32(opt2);
  
  		req->params = cpu_to_be64(FILTER_TUPLE_V(cxgb4_select_ntuple(
  					  csk->cdev->ports[csk->port_id],
  					  csk->l2t)));
  	}
  
  	set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id);
  
  	pr_info("t%d csk 0x%p,%u,0x%lx,%u, [%pI6]:%u-[%pI6]:%u, rss_qid %u.\n",
  		t4 ? 4 : 5, csk, csk->state, csk->flags, csk->atid,
  		&csk->saddr6.sin6_addr, ntohs(csk->saddr.sin_port),
  		&csk->daddr6.sin6_addr, ntohs(csk->daddr.sin_port),
  		csk->rss_qid);
  
  	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
  }
  #endif
  
  static void send_close_req(struct cxgbi_sock *csk)
  {
  	struct sk_buff *skb = csk->cpl_close;
  	struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
  	unsigned int tid = csk->tid;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx, tid %u.\n",
  		csk, csk->state, csk->flags, csk->tid);
  	csk->cpl_close = NULL;
  	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  	INIT_TP_WR(req, tid);
  	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
  	req->rsvd = 0;
  
  	cxgbi_sock_skb_entail(csk, skb);
  	if (csk->state >= CTP_ESTABLISHED)
  		push_tx_frames(csk, 1);
  }
  
  static void abort_arp_failure(void *handle, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk = (struct cxgbi_sock *)handle;
  	struct cpl_abort_req *req;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx, tid %u, abort.\n",
  		csk, csk->state, csk->flags, csk->tid);
  	req = (struct cpl_abort_req *)skb->data;
  	req->cmd = CPL_ABORT_NO_RST;
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  }
  
  static void send_abort_req(struct cxgbi_sock *csk)
  {
  	struct cpl_abort_req *req;
  	struct sk_buff *skb = csk->cpl_abort_req;
  
  	if (unlikely(csk->state == CTP_ABORTING) || !skb || !csk->cdev)
  		return;
  
  	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
  		send_tx_flowc_wr(csk);
  		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
  	}
  
  	cxgbi_sock_set_state(csk, CTP_ABORTING);
  	cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
  	cxgbi_sock_purge_write_queue(csk);
  
  	csk->cpl_abort_req = NULL;
  	req = (struct cpl_abort_req *)skb->head;
  	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  	req->cmd = CPL_ABORT_SEND_RST;
  	t4_set_arp_err_handler(skb, csk, abort_arp_failure);
  	INIT_TP_WR(req, csk->tid);
  	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
  	req->rsvd0 = htonl(csk->snd_nxt);
  	req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
  		csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
  		req->rsvd1);
  
  	cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
  }
  
  static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
  {
  	struct sk_buff *skb = csk->cpl_abort_rpl;
  	struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx,%u, status %d.\n",
  		csk, csk->state, csk->flags, csk->tid, rst_status);
  
  	csk->cpl_abort_rpl = NULL;
  	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  	INIT_TP_WR(rpl, csk->tid);
  	OPCODE_TID(rpl) = cpu_to_be32(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
  	rpl->cmd = rst_status;
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  }
  
  /*
   * CPL connection rx data ack: host ->
   * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
   * credits sent.
   */
  static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
  {
  	struct sk_buff *skb;
  	struct cpl_rx_data_ack *req;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  		"csk 0x%p,%u,0x%lx,%u, credit %u.\n",
  		csk, csk->state, csk->flags, csk->tid, credits);
  
  	skb = alloc_wr(sizeof(*req), 0, GFP_ATOMIC);
  	if (!skb) {
  		pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
  		return 0;
  	}
  	req = (struct cpl_rx_data_ack *)skb->head;
  
  	set_wr_txq(skb, CPL_PRIORITY_ACK, csk->port_id);
  	INIT_TP_WR(req, csk->tid);
  	OPCODE_TID(req) = cpu_to_be32(MK_OPCODE_TID(CPL_RX_DATA_ACK,
  				      csk->tid));
  	req->credit_dack = cpu_to_be32(RX_CREDITS_V(credits)
  				       | RX_FORCE_ACK_F);
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  	return credits;
  }
  
  /*
   * sgl_len - calculates the size of an SGL of the given capacity
   * @n: the number of SGL entries
   * Calculates the number of flits needed for a scatter/gather list that
   * can hold the given number of entries.
   */
  static inline unsigned int sgl_len(unsigned int n)
  {
  	n--;
  	return (3 * n) / 2 + (n & 1) + 2;
  }
  
  /*
   * calc_tx_flits_ofld - calculate # of flits for an offload packet
   * @skb: the packet
   *
   * Returns the number of flits needed for the given offload packet.
   * These packets are already fully constructed and no additional headers
   * will be added.
   */
  static inline unsigned int calc_tx_flits_ofld(const struct sk_buff *skb)
  {
  	unsigned int flits, cnt;
  
  	if (is_ofld_imm(skb))
  		return DIV_ROUND_UP(skb->len, 8);
  	flits = skb_transport_offset(skb) / 8;
  	cnt = skb_shinfo(skb)->nr_frags;
  	if (skb_tail_pointer(skb) != skb_transport_header(skb))
  		cnt++;
  	return flits + sgl_len(cnt);
  }
  
  #define FLOWC_WR_NPARAMS_MIN	9
  static inline int tx_flowc_wr_credits(int *nparamsp, int *flowclenp)
  {
  	int nparams, flowclen16, flowclen;
  
  	nparams = FLOWC_WR_NPARAMS_MIN;
  	flowclen = offsetof(struct fw_flowc_wr, mnemval[nparams]);
  	flowclen16 = DIV_ROUND_UP(flowclen, 16);
  	flowclen = flowclen16 * 16;
  	/*
  	 * Return the number of 16-byte credits used by the FlowC request.
  	 * Pass back the nparams and actual FlowC length if requested.
  	 */
  	if (nparamsp)
  		*nparamsp = nparams;
  	if (flowclenp)
  		*flowclenp = flowclen;
  
  	return flowclen16;
  }
  
  static inline int send_tx_flowc_wr(struct cxgbi_sock *csk)
  {
  	struct sk_buff *skb;
  	struct fw_flowc_wr *flowc;
  	int nparams, flowclen16, flowclen;
  
  	flowclen16 = tx_flowc_wr_credits(&nparams, &flowclen);
  	skb = alloc_wr(flowclen, 0, GFP_ATOMIC);
  	flowc = (struct fw_flowc_wr *)skb->head;
  	flowc->op_to_nparams =
  		htonl(FW_WR_OP_V(FW_FLOWC_WR) | FW_FLOWC_WR_NPARAMS_V(nparams));
  	flowc->flowid_len16 =
  		htonl(FW_WR_LEN16_V(flowclen16) | FW_WR_FLOWID_V(csk->tid));
  	flowc->mnemval[0].mnemonic = FW_FLOWC_MNEM_PFNVFN;
  	flowc->mnemval[0].val = htonl(csk->cdev->pfvf);
  	flowc->mnemval[1].mnemonic = FW_FLOWC_MNEM_CH;
  	flowc->mnemval[1].val = htonl(csk->tx_chan);
  	flowc->mnemval[2].mnemonic = FW_FLOWC_MNEM_PORT;
  	flowc->mnemval[2].val = htonl(csk->tx_chan);
  	flowc->mnemval[3].mnemonic = FW_FLOWC_MNEM_IQID;
  	flowc->mnemval[3].val = htonl(csk->rss_qid);
  	flowc->mnemval[4].mnemonic = FW_FLOWC_MNEM_SNDNXT;
  	flowc->mnemval[4].val = htonl(csk->snd_nxt);
  	flowc->mnemval[5].mnemonic = FW_FLOWC_MNEM_RCVNXT;
  	flowc->mnemval[5].val = htonl(csk->rcv_nxt);
  	flowc->mnemval[6].mnemonic = FW_FLOWC_MNEM_SNDBUF;
  	flowc->mnemval[6].val = htonl(csk->snd_win);
  	flowc->mnemval[7].mnemonic = FW_FLOWC_MNEM_MSS;
  	flowc->mnemval[7].val = htonl(csk->advmss);
  	flowc->mnemval[8].mnemonic = 0;
  	flowc->mnemval[8].val = 0;
  	flowc->mnemval[8].mnemonic = FW_FLOWC_MNEM_TXDATAPLEN_MAX;
  	flowc->mnemval[8].val = 16384;
  
  	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p, tid 0x%x, %u,%u,%u,%u,%u,%u,%u.\n",
  		csk, csk->tid, 0, csk->tx_chan, csk->rss_qid,
  		csk->snd_nxt, csk->rcv_nxt, csk->snd_win,
  		csk->advmss);
  
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  
  	return flowclen16;
  }
  
  static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
  				   int dlen, int len, u32 credits, int compl)
  {
  	struct fw_ofld_tx_data_wr *req;
  	unsigned int submode = cxgbi_skcb_ulp_mode(skb) & 3;
  	unsigned int wr_ulp_mode = 0, val;
  	bool imm = is_ofld_imm(skb);
  
  	req = (struct fw_ofld_tx_data_wr *)__skb_push(skb, sizeof(*req));
  
  	if (imm) {
  		req->op_to_immdlen = htonl(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
  					FW_WR_COMPL_F |
  					FW_WR_IMMDLEN_V(dlen));
  		req->flowid_len16 = htonl(FW_WR_FLOWID_V(csk->tid) |
  						FW_WR_LEN16_V(credits));
  	} else {
  		req->op_to_immdlen =
  			cpu_to_be32(FW_WR_OP_V(FW_OFLD_TX_DATA_WR) |
  					FW_WR_COMPL_F |
  					FW_WR_IMMDLEN_V(0));
  		req->flowid_len16 =
  			cpu_to_be32(FW_WR_FLOWID_V(csk->tid) |
  					FW_WR_LEN16_V(credits));
  	}
  	if (submode)
  		wr_ulp_mode = FW_OFLD_TX_DATA_WR_ULPMODE_V(ULP2_MODE_ISCSI) |
  				FW_OFLD_TX_DATA_WR_ULPSUBMODE_V(submode);
  	val = skb_peek(&csk->write_queue) ? 0 : 1;
  	req->tunnel_to_proxy = htonl(wr_ulp_mode |
  				     FW_OFLD_TX_DATA_WR_SHOVE_V(val));
  	req->plen = htonl(len);
  	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT))
  		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
  }
  
  static void arp_failure_skb_discard(void *handle, struct sk_buff *skb)
  {
  	kfree_skb(skb);
  }
  
  static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
  {
  	int total_size = 0;
  	struct sk_buff *skb;
  
  	if (unlikely(csk->state < CTP_ESTABLISHED ||
  		csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK |
  			 1 << CXGBI_DBG_PDU_TX,
  			"csk 0x%p,%u,0x%lx,%u, in closing state.\n",
  			csk, csk->state, csk->flags, csk->tid);
  		return 0;
  	}
  
  	while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
  		int dlen = skb->len;
  		int len = skb->len;
  		unsigned int credits_needed;
  		int flowclen16 = 0;
  
  		skb_reset_transport_header(skb);
  		if (is_ofld_imm(skb))
  			credits_needed = DIV_ROUND_UP(dlen, 16);
  		else
  			credits_needed = DIV_ROUND_UP(
  						8 * calc_tx_flits_ofld(skb),
  						16);
  
  		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR)))
  			credits_needed += DIV_ROUND_UP(
  					sizeof(struct fw_ofld_tx_data_wr),
  					16);
  
  		/*
  		 * Assumes the initial credits is large enough to support
  		 * fw_flowc_wr plus largest possible first payload
  		 */
  		if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
  			flowclen16 = send_tx_flowc_wr(csk);
  			csk->wr_cred -= flowclen16;
  			csk->wr_una_cred += flowclen16;
  			cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
  		}
  
  		if (csk->wr_cred < credits_needed) {
  			log_debug(1 << CXGBI_DBG_PDU_TX,
  				"csk 0x%p, skb %u/%u, wr %d < %u.\n",
  				csk, skb->len, skb->data_len,
  				credits_needed, csk->wr_cred);
  			break;
  		}
  		__skb_unlink(skb, &csk->write_queue);
  		set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  		skb->csum = credits_needed + flowclen16;
  		csk->wr_cred -= credits_needed;
  		csk->wr_una_cred += credits_needed;
  		cxgbi_sock_enqueue_wr(csk, skb);
  
  		log_debug(1 << CXGBI_DBG_PDU_TX,
  			"csk 0x%p, skb %u/%u, wr %d, left %u, unack %u.\n",
  			csk, skb->len, skb->data_len, credits_needed,
  			csk->wr_cred, csk->wr_una_cred);
  
  		if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
  			len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
  			make_tx_data_wr(csk, skb, dlen, len, credits_needed,
  					req_completion);
  			csk->snd_nxt += len;
  			cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
  		} else if (cxgbi_skcb_test_flag(skb, SKCBF_TX_FLAG_COMPL) &&
  			   (csk->wr_una_cred >= (csk->wr_max_cred / 2))) {
  			struct cpl_close_con_req *req =
  				(struct cpl_close_con_req *)skb->data;
  			req->wr.wr_hi |= htonl(FW_WR_COMPL_F);
  		}
  		total_size += skb->truesize;
  		t4_set_arp_err_handler(skb, csk, arp_failure_skb_discard);
  
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
  			"csk 0x%p,%u,0x%lx,%u, skb 0x%p, %u.\n",
  			csk, csk->state, csk->flags, csk->tid, skb, len);
  
  		cxgb4_l2t_send(csk->cdev->ports[csk->port_id], skb, csk->l2t);
  	}
  	return total_size;
  }
  
  static inline void free_atid(struct cxgbi_sock *csk)
  {
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
  
  	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
  		cxgb4_free_atid(lldi->tids, csk->atid);
  		cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
  		cxgbi_sock_put(csk);
  	}
  }
  
  static void do_act_establish(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_act_establish *req = (struct cpl_act_establish *)skb->data;
  	unsigned short tcp_opt = ntohs(req->tcp_opt);
  	unsigned int tid = GET_TID(req);
  	unsigned int atid = TID_TID_G(ntohl(req->tos_atid));
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  	u32 rcv_isn = be32_to_cpu(req->rcv_isn);
  
  	csk = lookup_atid(t, atid);
  	if (unlikely(!csk)) {
  		pr_err("NO conn. for atid %u, cdev 0x%p.\n", atid, cdev);
  		goto rel_skb;
  	}
  
  	if (csk->atid != atid) {
  		pr_err("bad conn atid %u, csk 0x%p,%u,0x%lx,tid %u, atid %u.\n",
  			atid, csk, csk->state, csk->flags, csk->tid, csk->atid);
  		goto rel_skb;
  	}
  
  	pr_info_ipaddr("atid 0x%x, tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
  		       (&csk->saddr), (&csk->daddr),
  		       atid, tid, csk, csk->state, csk->flags, rcv_isn);
  
  	module_put(THIS_MODULE);
  
  	cxgbi_sock_get(csk);
  	csk->tid = tid;
  	cxgb4_insert_tid(lldi->tids, csk, tid);
  	cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
  
  	free_atid(csk);
  
  	spin_lock_bh(&csk->lock);
  	if (unlikely(csk->state != CTP_ACTIVE_OPEN))
  		pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
  			csk, csk->state, csk->flags, csk->tid);
  
  	if (csk->retry_timer.function) {
  		del_timer(&csk->retry_timer);
  		csk->retry_timer.function = NULL;
  	}
  
  	csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
  	/*
  	 * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
  	 * pass through opt0.
  	 */
  	if (csk->rcv_win > (RCV_BUFSIZ_MASK << 10))
  		csk->rcv_wup -= csk->rcv_win - (RCV_BUFSIZ_MASK << 10);
  
  	csk->advmss = lldi->mtus[TCPOPT_MSS_G(tcp_opt)] - 40;
  	if (TCPOPT_TSTAMP_G(tcp_opt))
  		csk->advmss -= 12;
  	if (csk->advmss < 128)
  		csk->advmss = 128;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p, mss_idx %u, advmss %u.\n",
  			csk, TCPOPT_MSS_G(tcp_opt), csk->advmss);
  
  	cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
  
  	if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
  		send_abort_req(csk);
  	else {
  		if (skb_queue_len(&csk->write_queue))
  			push_tx_frames(csk, 0);
  		cxgbi_conn_tx_open(csk);
  	}
  	spin_unlock_bh(&csk->lock);
  
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static int act_open_rpl_status_to_errno(int status)
  {
  	switch (status) {
  	case CPL_ERR_CONN_RESET:
  		return -ECONNREFUSED;
  	case CPL_ERR_ARP_MISS:
  		return -EHOSTUNREACH;
  	case CPL_ERR_CONN_TIMEDOUT:
  		return -ETIMEDOUT;
  	case CPL_ERR_TCAM_FULL:
  		return -ENOMEM;
  	case CPL_ERR_CONN_EXIST:
  		return -EADDRINUSE;
  	default:
  		return -EIO;
  	}
  }
  
  static void csk_act_open_retry_timer(unsigned long data)
  {
  	struct sk_buff *skb = NULL;
  	struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(csk->cdev);
  	void (*send_act_open_func)(struct cxgbi_sock *, struct sk_buff *,
  				   struct l2t_entry *);
  	int t4 = is_t4(lldi->adapter_type), size, size6;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx,%u.\n",
  		csk, csk->state, csk->flags, csk->tid);
  
  	cxgbi_sock_get(csk);
  	spin_lock_bh(&csk->lock);
  
  	if (t4) {
  		size = sizeof(struct cpl_act_open_req);
  		size6 = sizeof(struct cpl_act_open_req6);
  	} else {
  		size = sizeof(struct cpl_t5_act_open_req);
  		size6 = sizeof(struct cpl_t5_act_open_req6);
  	}
  
  	if (csk->csk_family == AF_INET) {
  		send_act_open_func = send_act_open_req;
  		skb = alloc_wr(size, 0, GFP_ATOMIC);
  #if IS_ENABLED(CONFIG_IPV6)
  	} else {
  		send_act_open_func = send_act_open_req6;
  		skb = alloc_wr(size6, 0, GFP_ATOMIC);
  #endif
  	}
  
  	if (!skb)
  		cxgbi_sock_fail_act_open(csk, -ENOMEM);
  	else {
  		skb->sk = (struct sock *)csk;
  		t4_set_arp_err_handler(skb, csk,
  				       cxgbi_sock_act_open_req_arp_failure);
  		send_act_open_func(csk, skb, csk->l2t);
  	}
  
  	spin_unlock_bh(&csk->lock);
  	cxgbi_sock_put(csk);
  
  }
  
  static inline bool is_neg_adv(unsigned int status)
  {
  	return status == CPL_ERR_RTX_NEG_ADVICE ||
  		status == CPL_ERR_KEEPALV_NEG_ADVICE ||
  		status == CPL_ERR_PERSIST_NEG_ADVICE;
  }
  
  static void do_act_open_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_act_open_rpl *rpl = (struct cpl_act_open_rpl *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	unsigned int atid =
  		TID_TID_G(AOPEN_ATID_G(be32_to_cpu(rpl->atid_status)));
  	unsigned int status = AOPEN_STATUS_G(be32_to_cpu(rpl->atid_status));
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_atid(t, atid);
  	if (unlikely(!csk)) {
  		pr_err("NO matching conn. atid %u, tid %u.\n", atid, tid);
  		goto rel_skb;
  	}
  
  	pr_info_ipaddr("tid %u/%u, status %u.\n"
  		       "csk 0x%p,%u,0x%lx. ", (&csk->saddr), (&csk->daddr),
  		       atid, tid, status, csk, csk->state, csk->flags);
  
  	if (is_neg_adv(status))
  		goto rel_skb;
  
  	module_put(THIS_MODULE);
  
  	if (status && status != CPL_ERR_TCAM_FULL &&
  	    status != CPL_ERR_CONN_EXIST &&
  	    status != CPL_ERR_ARP_MISS)
  		cxgb4_remove_tid(lldi->tids, csk->port_id, GET_TID(rpl));
  
  	cxgbi_sock_get(csk);
  	spin_lock_bh(&csk->lock);
  
  	if (status == CPL_ERR_CONN_EXIST &&
  	    csk->retry_timer.function != csk_act_open_retry_timer) {
  		csk->retry_timer.function = csk_act_open_retry_timer;
  		mod_timer(&csk->retry_timer, jiffies + HZ / 2);
  	} else
  		cxgbi_sock_fail_act_open(csk,
  					act_open_rpl_status_to_errno(status));
  
  	spin_unlock_bh(&csk->lock);
  	cxgbi_sock_put(csk);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_peer_close(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_peer_close *req = (struct cpl_peer_close *)skb->data;
  	unsigned int tid = GET_TID(req);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk)) {
  		pr_err("can't find connection for tid %u.\n", tid);
  		goto rel_skb;
  	}
  	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
  		       (&csk->saddr), (&csk->daddr),
  		       csk, csk->state, csk->flags, csk->tid);
  	cxgbi_sock_rcv_peer_close(csk);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_close_con_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_close_con_rpl *rpl = (struct cpl_close_con_rpl *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk)) {
  		pr_err("can't find connection for tid %u.\n", tid);
  		goto rel_skb;
  	}
  	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u.\n",
  		       (&csk->saddr), (&csk->daddr),
  		       csk, csk->state, csk->flags, csk->tid);
  	cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
  								int *need_rst)
  {
  	switch (abort_reason) {
  	case CPL_ERR_BAD_SYN: /* fall through */
  	case CPL_ERR_CONN_RESET:
  		return csk->state > CTP_ESTABLISHED ?
  			-EPIPE : -ECONNRESET;
  	case CPL_ERR_XMIT_TIMEDOUT:
  	case CPL_ERR_PERSIST_TIMEDOUT:
  	case CPL_ERR_FINWAIT2_TIMEDOUT:
  	case CPL_ERR_KEEPALIVE_TIMEDOUT:
  		return -ETIMEDOUT;
  	default:
  		return -EIO;
  	}
  }
  
  static void do_abort_req_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_abort_req_rss *req = (struct cpl_abort_req_rss *)skb->data;
  	unsigned int tid = GET_TID(req);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  	int rst_status = CPL_ABORT_NO_RST;
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk)) {
  		pr_err("can't find connection for tid %u.\n", tid);
  		goto rel_skb;
  	}
  
  	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
  		       (&csk->saddr), (&csk->daddr),
  		       csk, csk->state, csk->flags, csk->tid, req->status);
  
  	if (is_neg_adv(req->status))
  		goto rel_skb;
  
  	cxgbi_sock_get(csk);
  	spin_lock_bh(&csk->lock);
  
  	cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
  
  	if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
  		send_tx_flowc_wr(csk);
  		cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
  	}
  
  	cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
  	cxgbi_sock_set_state(csk, CTP_ABORTING);
  
  	send_abort_rpl(csk, rst_status);
  
  	if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
  		csk->err = abort_status_to_errno(csk, req->status, &rst_status);
  		cxgbi_sock_closed(csk);
  	}
  
  	spin_unlock_bh(&csk->lock);
  	cxgbi_sock_put(csk);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_abort_rpl_rss(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_abort_rpl_rss *rpl = (struct cpl_abort_rpl_rss *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (!csk)
  		goto rel_skb;
  
  	if (csk)
  		pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u, status %u.\n",
  			       (&csk->saddr), (&csk->daddr), csk,
  			       csk->state, csk->flags, csk->tid, rpl->status);
  
  	if (rpl->status == CPL_ERR_ABORT_FAILED)
  		goto rel_skb;
  
  	cxgbi_sock_rcv_abort_rpl(csk);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_rx_data(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_rx_data *cpl = (struct cpl_rx_data *)skb->data;
  	unsigned int tid = GET_TID(cpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (!csk) {
  		pr_err("can't find connection for tid %u.\n", tid);
  	} else {
  		/* not expecting this, reset the connection. */
  		pr_err("csk 0x%p, tid %u, rcv cpl_rx_data.\n", csk, tid);
  		spin_lock_bh(&csk->lock);
  		send_abort_req(csk);
  		spin_unlock_bh(&csk->lock);
  	}
  	__kfree_skb(skb);
  }
  
  static void do_rx_iscsi_hdr(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_iscsi_hdr *cpl = (struct cpl_iscsi_hdr *)skb->data;
  	unsigned short pdu_len_ddp = be16_to_cpu(cpl->pdu_len_ddp);
  	unsigned int tid = GET_TID(cpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk)) {
  		pr_err("can't find conn. for tid %u.\n", tid);
  		goto rel_skb;
  	}
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  		"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p,%u, 0x%x.\n",
  		csk, csk->state, csk->flags, csk->tid, skb, skb->len,
  		pdu_len_ddp);
  
  	spin_lock_bh(&csk->lock);
  
  	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
  			csk, csk->state, csk->flags, csk->tid);
  		if (csk->state != CTP_ABORTING)
  			goto abort_conn;
  		else
  			goto discard;
  	}
  
  	cxgbi_skcb_tcp_seq(skb) = ntohl(cpl->seq);
  	cxgbi_skcb_flags(skb) = 0;
  
  	skb_reset_transport_header(skb);
  	__skb_pull(skb, sizeof(*cpl));
  	__pskb_trim(skb, ntohs(cpl->len));
  
  	if (!csk->skb_ulp_lhdr) {
  		unsigned char *bhs;
  		unsigned int hlen, dlen, plen;
  
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  			"csk 0x%p,%u,0x%lx, tid %u, skb 0x%p header.\n",
  			csk, csk->state, csk->flags, csk->tid, skb);
  		csk->skb_ulp_lhdr = skb;
  		cxgbi_skcb_set_flag(skb, SKCBF_RX_HDR);
  
  		if (cxgbi_skcb_tcp_seq(skb) != csk->rcv_nxt) {
  			pr_info("tid %u, CPL_ISCSI_HDR, bad seq, 0x%x/0x%x.\n",
  				csk->tid, cxgbi_skcb_tcp_seq(skb),
  				csk->rcv_nxt);
  			goto abort_conn;
  		}
  
  		bhs = skb->data;
  		hlen = ntohs(cpl->len);
  		dlen = ntohl(*(unsigned int *)(bhs + 4)) & 0xFFFFFF;
  
  		plen = ISCSI_PDU_LEN_G(pdu_len_ddp);
  		if (is_t4(lldi->adapter_type))
  			plen -= 40;
  
  		if ((hlen + dlen) != plen) {
  			pr_info("tid 0x%x, CPL_ISCSI_HDR, pdu len "
  				"mismatch %u != %u + %u, seq 0x%x.\n",
  				csk->tid, plen, hlen, dlen,
  				cxgbi_skcb_tcp_seq(skb));
  			goto abort_conn;
  		}
  
  		cxgbi_skcb_rx_pdulen(skb) = (hlen + dlen + 3) & (~0x3);
  		if (dlen)
  			cxgbi_skcb_rx_pdulen(skb) += csk->dcrc_len;
  		csk->rcv_nxt += cxgbi_skcb_rx_pdulen(skb);
  
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  			"csk 0x%p, skb 0x%p, 0x%x,%u+%u,0x%x,0x%x.\n",
  			csk, skb, *bhs, hlen, dlen,
  			ntohl(*((unsigned int *)(bhs + 16))),
  			ntohl(*((unsigned int *)(bhs + 24))));
  
  	} else {
  		struct sk_buff *lskb = csk->skb_ulp_lhdr;
  
  		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA);
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  			"csk 0x%p,%u,0x%lx, skb 0x%p data, 0x%p.\n",
  			csk, csk->state, csk->flags, skb, lskb);
  	}
  
  	__skb_queue_tail(&csk->receive_queue, skb);
  	spin_unlock_bh(&csk->lock);
  	return;
  
  abort_conn:
  	send_abort_req(csk);
  discard:
  	spin_unlock_bh(&csk->lock);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_rx_data_ddp(struct cxgbi_device *cdev,
  				  struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct sk_buff *lskb;
  	struct cpl_rx_data_ddp *rpl = (struct cpl_rx_data_ddp *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  	unsigned int status = ntohl(rpl->ddpvld);
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk)) {
  		pr_err("can't find connection for tid %u.\n", tid);
  		goto rel_skb;
  	}
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
  		"csk 0x%p,%u,0x%lx, skb 0x%p,0x%x, lhdr 0x%p.\n",
  		csk, csk->state, csk->flags, skb, status, csk->skb_ulp_lhdr);
  
  	spin_lock_bh(&csk->lock);
  
  	if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  			"csk 0x%p,%u,0x%lx,%u, bad state.\n",
  			csk, csk->state, csk->flags, csk->tid);
  		if (csk->state != CTP_ABORTING)
  			goto abort_conn;
  		else
  			goto discard;
  	}
  
  	if (!csk->skb_ulp_lhdr) {
  		pr_err("tid 0x%x, rcv RX_DATA_DDP w/o pdu bhs.\n", csk->tid);
  		goto abort_conn;
  	}
  
  	lskb = csk->skb_ulp_lhdr;
  	csk->skb_ulp_lhdr = NULL;
  
  	cxgbi_skcb_rx_ddigest(lskb) = ntohl(rpl->ulp_crc);
  
  	if (ntohs(rpl->len) != cxgbi_skcb_rx_pdulen(lskb))
  		pr_info("tid 0x%x, RX_DATA_DDP pdulen %u != %u.\n",
  			csk->tid, ntohs(rpl->len), cxgbi_skcb_rx_pdulen(lskb));
  
  	if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT)) {
  		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, hcrc bad 0x%lx.\n",
  			csk, lskb, status, cxgbi_skcb_flags(lskb));
  		cxgbi_skcb_set_flag(lskb, SKCBF_RX_HCRC_ERR);
  	}
  	if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT)) {
  		pr_info("csk 0x%p, lhdr 0x%p, status 0x%x, dcrc bad 0x%lx.\n",
  			csk, lskb, status, cxgbi_skcb_flags(lskb));
  		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DCRC_ERR);
  	}
  	if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT)) {
  		log_debug(1 << CXGBI_DBG_PDU_RX,
  			"csk 0x%p, lhdr 0x%p, status 0x%x, pad bad.\n",
  			csk, lskb, status);
  		cxgbi_skcb_set_flag(lskb, SKCBF_RX_PAD_ERR);
  	}
  	if ((status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT)) &&
  		!cxgbi_skcb_test_flag(lskb, SKCBF_RX_DATA)) {
  		log_debug(1 << CXGBI_DBG_PDU_RX,
  			"csk 0x%p, lhdr 0x%p, 0x%x, data ddp'ed.\n",
  			csk, lskb, status);
  		cxgbi_skcb_set_flag(lskb, SKCBF_RX_DATA_DDPD);
  	}
  	log_debug(1 << CXGBI_DBG_PDU_RX,
  		"csk 0x%p, lskb 0x%p, f 0x%lx.\n",
  		csk, lskb, cxgbi_skcb_flags(lskb));
  
  	cxgbi_skcb_set_flag(lskb, SKCBF_RX_STATUS);
  	cxgbi_conn_pdu_ready(csk);
  	spin_unlock_bh(&csk->lock);
  	goto rel_skb;
  
  abort_conn:
  	send_abort_req(csk);
  discard:
  	spin_unlock_bh(&csk->lock);
  rel_skb:
  	__kfree_skb(skb);
  }
  
  static void do_fw4_ack(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cxgbi_sock *csk;
  	struct cpl_fw4_ack *rpl = (struct cpl_fw4_ack *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  
  	csk = lookup_tid(t, tid);
  	if (unlikely(!csk))
  		pr_err("can't find connection for tid %u.\n", tid);
  	else {
  		log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  			"csk 0x%p,%u,0x%lx,%u.\n",
  			csk, csk->state, csk->flags, csk->tid);
  		cxgbi_sock_rcv_wr_ack(csk, rpl->credits, ntohl(rpl->snd_una),
  					rpl->seq_vld);
  	}
  	__kfree_skb(skb);
  }
  
  static void do_set_tcb_rpl(struct cxgbi_device *cdev, struct sk_buff *skb)
  {
  	struct cpl_set_tcb_rpl *rpl = (struct cpl_set_tcb_rpl *)skb->data;
  	unsigned int tid = GET_TID(rpl);
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct tid_info *t = lldi->tids;
  	struct cxgbi_sock *csk;
  
  	csk = lookup_tid(t, tid);
  	if (!csk)
  		pr_err("can't find conn. for tid %u.\n", tid);
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,%lx,%u, status 0x%x.\n",
  		csk, csk->state, csk->flags, csk->tid, rpl->status);
  
  	if (rpl->status != CPL_ERR_NONE)
  		pr_err("csk 0x%p,%u, SET_TCB_RPL status %u.\n",
  			csk, tid, rpl->status);
  
  	__kfree_skb(skb);
  }
  
  static int alloc_cpls(struct cxgbi_sock *csk)
  {
  	csk->cpl_close = alloc_wr(sizeof(struct cpl_close_con_req),
  					0, GFP_KERNEL);
  	if (!csk->cpl_close)
  		return -ENOMEM;
  
  	csk->cpl_abort_req = alloc_wr(sizeof(struct cpl_abort_req),
  					0, GFP_KERNEL);
  	if (!csk->cpl_abort_req)
  		goto free_cpls;
  
  	csk->cpl_abort_rpl = alloc_wr(sizeof(struct cpl_abort_rpl),
  					0, GFP_KERNEL);
  	if (!csk->cpl_abort_rpl)
  		goto free_cpls;
  	return 0;
  
  free_cpls:
  	cxgbi_sock_free_cpl_skbs(csk);
  	return -ENOMEM;
  }
  
  static inline void l2t_put(struct cxgbi_sock *csk)
  {
  	if (csk->l2t) {
  		cxgb4_l2t_release(csk->l2t);
  		csk->l2t = NULL;
  		cxgbi_sock_put(csk);
  	}
  }
  
  static void release_offload_resources(struct cxgbi_sock *csk)
  {
  	struct cxgb4_lld_info *lldi;
  #if IS_ENABLED(CONFIG_IPV6)
  	struct net_device *ndev = csk->cdev->ports[csk->port_id];
  #endif
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx,%u.\n",
  		csk, csk->state, csk->flags, csk->tid);
  
  	cxgbi_sock_free_cpl_skbs(csk);
  	cxgbi_sock_purge_write_queue(csk);
  	if (csk->wr_cred != csk->wr_max_cred) {
  		cxgbi_sock_purge_wr_queue(csk);
  		cxgbi_sock_reset_wr_list(csk);
  	}
  
  	l2t_put(csk);
  #if IS_ENABLED(CONFIG_IPV6)
  	if (csk->csk_family == AF_INET6)
  		cxgb4_clip_release(ndev,
  				   (const u32 *)&csk->saddr6.sin6_addr, 1);
  #endif
  
  	if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
  		free_atid(csk);
  	else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
  		lldi = cxgbi_cdev_priv(csk->cdev);
  		cxgb4_remove_tid(lldi->tids, 0, csk->tid);
  		cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
  		cxgbi_sock_put(csk);
  	}
  	csk->dst = NULL;
  	csk->cdev = NULL;
  }
  
  static int init_act_open(struct cxgbi_sock *csk)
  {
  	struct cxgbi_device *cdev = csk->cdev;
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct net_device *ndev = cdev->ports[csk->port_id];
  	struct sk_buff *skb = NULL;
  	struct neighbour *n = NULL;
  	void *daddr;
  	unsigned int step;
  	unsigned int size, size6;
  	int t4 = is_t4(lldi->adapter_type);
  	unsigned int linkspeed;
  	unsigned int rcv_winf, snd_winf;
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p,%u,0x%lx,%u.\n",
  		csk, csk->state, csk->flags, csk->tid);
  
  	if (csk->csk_family == AF_INET)
  		daddr = &csk->daddr.sin_addr.s_addr;
  #if IS_ENABLED(CONFIG_IPV6)
  	else if (csk->csk_family == AF_INET6)
  		daddr = &csk->daddr6.sin6_addr;
  #endif
  	else {
  		pr_err("address family 0x%x not supported\n", csk->csk_family);
  		goto rel_resource;
  	}
  
  	n = dst_neigh_lookup(csk->dst, daddr);
  
  	if (!n) {
  		pr_err("%s, can't get neighbour of csk->dst.\n", ndev->name);
  		goto rel_resource;
  	}
  
  	csk->atid = cxgb4_alloc_atid(lldi->tids, csk);
  	if (csk->atid < 0) {
  		pr_err("%s, NO atid available.\n", ndev->name);
  		return -EINVAL;
  	}
  	cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
  	cxgbi_sock_get(csk);
  
  	csk->l2t = cxgb4_l2t_get(lldi->l2t, n, ndev, 0);
  	if (!csk->l2t) {
  		pr_err("%s, cannot alloc l2t.\n", ndev->name);
  		goto rel_resource_without_clip;
  	}
  	cxgbi_sock_get(csk);
  
  #if IS_ENABLED(CONFIG_IPV6)
  	if (csk->csk_family == AF_INET6)
  		cxgb4_clip_get(ndev, (const u32 *)&csk->saddr6.sin6_addr, 1);
  #endif
  
  	if (t4) {
  		size = sizeof(struct cpl_act_open_req);
  		size6 = sizeof(struct cpl_act_open_req6);
  	} else {
  		size = sizeof(struct cpl_t5_act_open_req);
  		size6 = sizeof(struct cpl_t5_act_open_req6);
  	}
  
  	if (csk->csk_family == AF_INET)
  		skb = alloc_wr(size, 0, GFP_NOIO);
  #if IS_ENABLED(CONFIG_IPV6)
  	else
  		skb = alloc_wr(size6, 0, GFP_NOIO);
  #endif
  
  	if (!skb)
  		goto rel_resource;
  	skb->sk = (struct sock *)csk;
  	t4_set_arp_err_handler(skb, csk, cxgbi_sock_act_open_req_arp_failure);
  
  	if (!csk->mtu)
  		csk->mtu = dst_mtu(csk->dst);
  	cxgb4_best_mtu(lldi->mtus, csk->mtu, &csk->mss_idx);
  	csk->tx_chan = cxgb4_port_chan(ndev);
  	/* SMT two entries per row */
  	csk->smac_idx = ((cxgb4_port_viid(ndev) & 0x7F)) << 1;
  	step = lldi->ntxq / lldi->nchan;
  	csk->txq_idx = cxgb4_port_idx(ndev) * step;
  	step = lldi->nrxq / lldi->nchan;
  	csk->rss_qid = lldi->rxq_ids[cxgb4_port_idx(ndev) * step];
  	linkspeed = ((struct port_info *)netdev_priv(ndev))->link_cfg.speed;
  	csk->snd_win = cxgb4i_snd_win;
  	csk->rcv_win = cxgb4i_rcv_win;
  	if (cxgb4i_rcv_win <= 0) {
  		csk->rcv_win = CXGB4I_DEFAULT_10G_RCV_WIN;
  		rcv_winf = linkspeed / SPEED_10000;
  		if (rcv_winf)
  			csk->rcv_win *= rcv_winf;
  	}
  	if (cxgb4i_snd_win <= 0) {
  		csk->snd_win = CXGB4I_DEFAULT_10G_SND_WIN;
  		snd_winf = linkspeed / SPEED_10000;
  		if (snd_winf)
  			csk->snd_win *= snd_winf;
  	}
  	csk->wr_cred = lldi->wr_cred -
  		       DIV_ROUND_UP(sizeof(struct cpl_abort_req), 16);
  	csk->wr_max_cred = csk->wr_cred;
  	csk->wr_una_cred = 0;
  	cxgbi_sock_reset_wr_list(csk);
  	csk->err = 0;
  
  	pr_info_ipaddr("csk 0x%p,%u,0x%lx,%u,%u,%u, mtu %u,%u, smac %u.\n",
  		       (&csk->saddr), (&csk->daddr), csk, csk->state,
  		       csk->flags, csk->tx_chan, csk->txq_idx, csk->rss_qid,
  		       csk->mtu, csk->mss_idx, csk->smac_idx);
  
  	/* must wait for either a act_open_rpl or act_open_establish */
  	try_module_get(THIS_MODULE);
  	cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
  	if (csk->csk_family == AF_INET)
  		send_act_open_req(csk, skb, csk->l2t);
  #if IS_ENABLED(CONFIG_IPV6)
  	else
  		send_act_open_req6(csk, skb, csk->l2t);
  #endif
  	neigh_release(n);
  
  	return 0;
  
  rel_resource:
  #if IS_ENABLED(CONFIG_IPV6)
  	if (csk->csk_family == AF_INET6)
  		cxgb4_clip_release(ndev,
  				   (const u32 *)&csk->saddr6.sin6_addr, 1);
  #endif
  rel_resource_without_clip:
  	if (n)
  		neigh_release(n);
  	if (skb)
  		__kfree_skb(skb);
  	return -EINVAL;
  }
  
  static cxgb4i_cplhandler_func cxgb4i_cplhandlers[NUM_CPL_CMDS] = {
  	[CPL_ACT_ESTABLISH] = do_act_establish,
  	[CPL_ACT_OPEN_RPL] = do_act_open_rpl,
  	[CPL_PEER_CLOSE] = do_peer_close,
  	[CPL_ABORT_REQ_RSS] = do_abort_req_rss,
  	[CPL_ABORT_RPL_RSS] = do_abort_rpl_rss,
  	[CPL_CLOSE_CON_RPL] = do_close_con_rpl,
  	[CPL_FW4_ACK] = do_fw4_ack,
  	[CPL_ISCSI_HDR] = do_rx_iscsi_hdr,
  	[CPL_ISCSI_DATA] = do_rx_iscsi_hdr,
  	[CPL_SET_TCB_RPL] = do_set_tcb_rpl,
  	[CPL_RX_DATA_DDP] = do_rx_data_ddp,
  	[CPL_RX_ISCSI_DDP] = do_rx_data_ddp,
  	[CPL_RX_DATA] = do_rx_data,
  };
  
  static int cxgb4i_ofld_init(struct cxgbi_device *cdev)
  {
  	int rc;
  
  	if (cxgb4i_max_connect > CXGB4I_MAX_CONN)
  		cxgb4i_max_connect = CXGB4I_MAX_CONN;
  
  	rc = cxgbi_device_portmap_create(cdev, cxgb4i_sport_base,
  					cxgb4i_max_connect);
  	if (rc < 0)
  		return rc;
  
  	cdev->csk_release_offload_resources = release_offload_resources;
  	cdev->csk_push_tx_frames = push_tx_frames;
  	cdev->csk_send_abort_req = send_abort_req;
  	cdev->csk_send_close_req = send_close_req;
  	cdev->csk_send_rx_credits = send_rx_credits;
  	cdev->csk_alloc_cpls = alloc_cpls;
  	cdev->csk_init_act_open = init_act_open;
  
  	pr_info("cdev 0x%p, offload up, added.\n", cdev);
  	return 0;
  }
  
  static inline void
  ulp_mem_io_set_hdr(struct cxgbi_device *cdev,
  		   struct ulp_mem_io *req,
  		   unsigned int wr_len, unsigned int dlen,
  		   unsigned int pm_addr,
  		   int tid)
  {
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct ulptx_idata *idata = (struct ulptx_idata *)(req + 1);
  
  	INIT_ULPTX_WR(req, wr_len, 0, tid);
  	req->wr.wr_hi = htonl(FW_WR_OP_V(FW_ULPTX_WR) |
  		FW_WR_ATOMIC_V(0));
  	req->cmd = htonl(ULPTX_CMD_V(ULP_TX_MEM_WRITE) |
  		ULP_MEMIO_ORDER_V(is_t4(lldi->adapter_type)) |
  		T5_ULP_MEMIO_IMM_V(!is_t4(lldi->adapter_type)));
  	req->dlen = htonl(ULP_MEMIO_DATA_LEN_V(dlen >> 5));
  	req->lock_addr = htonl(ULP_MEMIO_ADDR_V(pm_addr >> 5));
  	req->len16 = htonl(DIV_ROUND_UP(wr_len - sizeof(req->wr), 16));
  
  	idata->cmd_more = htonl(ULPTX_CMD_V(ULP_TX_SC_IMM));
  	idata->len = htonl(dlen);
  }
  
  static struct sk_buff *
  ddp_ppod_init_idata(struct cxgbi_device *cdev,
  		    struct cxgbi_ppm *ppm,
  		    unsigned int idx, unsigned int npods,
  		    unsigned int tid)
  {
  	unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ppm->llimit;
  	unsigned int dlen = npods << PPOD_SIZE_SHIFT;
  	unsigned int wr_len = roundup(sizeof(struct ulp_mem_io) +
  				sizeof(struct ulptx_idata) + dlen, 16);
  	struct sk_buff *skb = alloc_wr(wr_len, 0, GFP_ATOMIC);
  
  	if (!skb) {
  		pr_err("%s: %s idx %u, npods %u, OOM.\n",
  		       __func__, ppm->ndev->name, idx, npods);
  		return NULL;
  	}
  
  	ulp_mem_io_set_hdr(cdev, (struct ulp_mem_io *)skb->head, wr_len, dlen,
  			   pm_addr, tid);
  
  	return skb;
  }
  
  static int ddp_ppod_write_idata(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
  				struct cxgbi_task_tag_info *ttinfo,
  				unsigned int idx, unsigned int npods,
  				struct scatterlist **sg_pp,
  				unsigned int *sg_off)
  {
  	struct cxgbi_device *cdev = csk->cdev;
  	struct sk_buff *skb = ddp_ppod_init_idata(cdev, ppm, idx, npods,
  						  csk->tid);
  	struct ulp_mem_io *req;
  	struct ulptx_idata *idata;
  	struct cxgbi_pagepod *ppod;
  	int i;
  
  	if (!skb)
  		return -ENOMEM;
  
  	req = (struct ulp_mem_io *)skb->head;
  	idata = (struct ulptx_idata *)(req + 1);
  	ppod = (struct cxgbi_pagepod *)(idata + 1);
  
  	for (i = 0; i < npods; i++, ppod++)
  		cxgbi_ddp_set_one_ppod(ppod, ttinfo, sg_pp, sg_off);
  
  	cxgbi_skcb_set_flag(skb, SKCBF_TX_MEM_WRITE);
  	cxgbi_skcb_set_flag(skb, SKCBF_TX_FLAG_COMPL);
  	set_wr_txq(skb, CPL_PRIORITY_DATA, csk->port_id);
  
  	spin_lock_bh(&csk->lock);
  	cxgbi_sock_skb_entail(csk, skb);
  	spin_unlock_bh(&csk->lock);
  
  	return 0;
  }
  
  static int ddp_set_map(struct cxgbi_ppm *ppm, struct cxgbi_sock *csk,
  		       struct cxgbi_task_tag_info *ttinfo)
  {
  	unsigned int pidx = ttinfo->idx;
  	unsigned int npods = ttinfo->npods;
  	unsigned int i, cnt;
  	int err = 0;
  	struct scatterlist *sg = ttinfo->sgl;
  	unsigned int offset = 0;
  
  	ttinfo->cid = csk->port_id;
  
  	for (i = 0; i < npods; i += cnt, pidx += cnt) {
  		cnt = npods - i;
  
  		if (cnt > ULPMEM_IDATA_MAX_NPPODS)
  			cnt = ULPMEM_IDATA_MAX_NPPODS;
  		err = ddp_ppod_write_idata(ppm, csk, ttinfo, pidx, cnt,
  					   &sg, &offset);
  		if (err < 0)
  			break;
  	}
  
  	return err;
  }
  
  static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk, unsigned int tid,
  				int pg_idx, bool reply)
  {
  	struct sk_buff *skb;
  	struct cpl_set_tcb_field *req;
  
  	if (!pg_idx || pg_idx >= DDP_PGIDX_MAX)
  		return 0;
  
  	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
  	if (!skb)
  		return -ENOMEM;
  
  	/*  set up ulp page size */
  	req = (struct cpl_set_tcb_field *)skb->head;
  	INIT_TP_WR(req, csk->tid);
  	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, csk->tid));
  	req->reply_ctrl = htons(NO_REPLY_V(reply) | QUEUENO_V(csk->rss_qid));
  	req->word_cookie = htons(0);
  	req->mask = cpu_to_be64(0x3 << 8);
  	req->val = cpu_to_be64(pg_idx << 8);
  	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p, tid 0x%x, pg_idx %u.\n", csk, csk->tid, pg_idx);
  
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  	return 0;
  }
  
  static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
  				 int hcrc, int dcrc, int reply)
  {
  	struct sk_buff *skb;
  	struct cpl_set_tcb_field *req;
  
  	if (!hcrc && !dcrc)
  		return 0;
  
  	skb = alloc_wr(sizeof(*req), 0, GFP_KERNEL);
  	if (!skb)
  		return -ENOMEM;
  
  	csk->hcrc_len = (hcrc ? 4 : 0);
  	csk->dcrc_len = (dcrc ? 4 : 0);
  	/*  set up ulp submode */
  	req = (struct cpl_set_tcb_field *)skb->head;
  	INIT_TP_WR(req, tid);
  	OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
  	req->reply_ctrl = htons(NO_REPLY_V(reply) | QUEUENO_V(csk->rss_qid));
  	req->word_cookie = htons(0);
  	req->mask = cpu_to_be64(0x3 << 4);
  	req->val = cpu_to_be64(((hcrc ? ULP_CRC_HEADER : 0) |
  				(dcrc ? ULP_CRC_DATA : 0)) << 4);
  	set_wr_txq(skb, CPL_PRIORITY_CONTROL, csk->port_id);
  
  	log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
  		"csk 0x%p, tid 0x%x, crc %d,%d.\n", csk, csk->tid, hcrc, dcrc);
  
  	cxgb4_ofld_send(csk->cdev->ports[csk->port_id], skb);
  	return 0;
  }
  
  static struct cxgbi_ppm *cdev2ppm(struct cxgbi_device *cdev)
  {
  	return (struct cxgbi_ppm *)(*((struct cxgb4_lld_info *)
  				       (cxgbi_cdev_priv(cdev)))->iscsi_ppm);
  }
  
  static int cxgb4i_ddp_init(struct cxgbi_device *cdev)
  {
  	struct cxgb4_lld_info *lldi = cxgbi_cdev_priv(cdev);
  	struct net_device *ndev = cdev->ports[0];
  	struct cxgbi_tag_format tformat;
  	unsigned int ppmax;
  	int i;
  
  	if (!lldi->vr->iscsi.size) {
  		pr_warn("%s, iscsi NOT enabled, check config!\n", ndev->name);
  		return -EACCES;
  	}
  
  	cdev->flags |= CXGBI_FLAG_USE_PPOD_OFLDQ;
  	ppmax = lldi->vr->iscsi.size >> PPOD_SIZE_SHIFT;
  
  	memset(&tformat, 0, sizeof(struct cxgbi_tag_format));
  	for (i = 0; i < 4; i++)
  		tformat.pgsz_order[i] = (lldi->iscsi_pgsz_order >> (i << 3))
  					 & 0xF;
  	cxgbi_tagmask_check(lldi->iscsi_tagmask, &tformat);
  
  	cxgbi_ddp_ppm_setup(lldi->iscsi_ppm, cdev, &tformat, ppmax,
  			    lldi->iscsi_llimit, lldi->vr->iscsi.start, 2);
  
  	cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
  	cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
  	cdev->csk_ddp_set_map = ddp_set_map;
  	cdev->tx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
  				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
  	cdev->rx_max_size = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
  				  lldi->iscsi_iolen - ISCSI_PDU_NONPAYLOAD_LEN);
  	cdev->cdev2ppm = cdev2ppm;
  
  	return 0;
  }
  
  static void *t4_uld_add(const struct cxgb4_lld_info *lldi)
  {
  	struct cxgbi_device *cdev;
  	struct port_info *pi;
  	int i, rc;
  
  	cdev = cxgbi_device_register(sizeof(*lldi), lldi->nports);
  	if (!cdev) {
  		pr_info("t4 device 0x%p, register failed.\n", lldi);
  		return NULL;
  	}
  	pr_info("0x%p,0x%x, ports %u,%s, chan %u, q %u,%u, wr %u.\n",
  		cdev, lldi->adapter_type, lldi->nports,
  		lldi->ports[0]->name, lldi->nchan, lldi->ntxq,
  		lldi->nrxq, lldi->wr_cred);
  	for (i = 0; i < lldi->nrxq; i++)
  		log_debug(1 << CXGBI_DBG_DEV,
  			"t4 0x%p, rxq id #%d: %u.\n",
  			cdev, i, lldi->rxq_ids[i]);
  
  	memcpy(cxgbi_cdev_priv(cdev), lldi, sizeof(*lldi));
  	cdev->flags = CXGBI_FLAG_DEV_T4;
  	cdev->pdev = lldi->pdev;
  	cdev->ports = lldi->ports;
  	cdev->nports = lldi->nports;
  	cdev->mtus = lldi->mtus;
  	cdev->nmtus = NMTUS;
  	cdev->rx_credit_thres = cxgb4i_rx_credit_thres;
  	cdev->skb_tx_rsvd = CXGB4I_TX_HEADER_LEN;
  	cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr);
  	cdev->itp = &cxgb4i_iscsi_transport;
  
  	cdev->pfvf = FW_VIID_PFN_G(cxgb4_port_viid(lldi->ports[0]))
  			<< FW_VIID_PFN_S;
  	pr_info("cdev 0x%p,%s, pfvf %u.\n",
  		cdev, lldi->ports[0]->name, cdev->pfvf);
  
  	rc = cxgb4i_ddp_init(cdev);
  	if (rc) {
  		pr_info("t4 0x%p ddp init failed.\n", cdev);
  		goto err_out;
  	}
  	rc = cxgb4i_ofld_init(cdev);
  	if (rc) {
  		pr_info("t4 0x%p ofld init failed.\n", cdev);
  		goto err_out;
  	}
  
  	rc = cxgbi_hbas_add(cdev, CXGB4I_MAX_LUN, CXGBI_MAX_CONN,
  				&cxgb4i_host_template, cxgb4i_stt);
  	if (rc)
  		goto err_out;
  
  	for (i = 0; i < cdev->nports; i++) {
  		pi = netdev_priv(lldi->ports[i]);
  		cdev->hbas[i]->port_id = pi->port_id;
  	}
  	return cdev;
  
  err_out:
  	cxgbi_device_unregister(cdev);
  	return ERR_PTR(-ENOMEM);
  }
  
  #define RX_PULL_LEN	128
  static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
  				const struct pkt_gl *pgl)
  {
  	const struct cpl_act_establish *rpl;
  	struct sk_buff *skb;
  	unsigned int opc;
  	struct cxgbi_device *cdev = handle;
  
  	if (pgl == NULL) {
  		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
  
  		skb = alloc_wr(len, 0, GFP_ATOMIC);
  		if (!skb)
  			goto nomem;
  		skb_copy_to_linear_data(skb, &rsp[1], len);
  	} else {
  		if (unlikely(*(u8 *)rsp != *(u8 *)pgl->va)) {
  			pr_info("? FL 0x%p,RSS%#llx,FL %#llx,len %u.\n",
  				pgl->va, be64_to_cpu(*rsp),
  				be64_to_cpu(*(u64 *)pgl->va),
  				pgl->tot_len);
  			return 0;
  		}
  		skb = cxgb4_pktgl_to_skb(pgl, RX_PULL_LEN, RX_PULL_LEN);
  		if (unlikely(!skb))
  			goto nomem;
  	}
  
  	rpl = (struct cpl_act_establish *)skb->data;
  	opc = rpl->ot.opcode;
  	log_debug(1 << CXGBI_DBG_TOE,
  		"cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
  		 cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
  	if (cxgb4i_cplhandlers[opc])
  		cxgb4i_cplhandlers[opc](cdev, skb);
  	else {
  		pr_err("No handler for opcode 0x%x.\n", opc);
  		__kfree_skb(skb);
  	}
  	return 0;
  nomem:
  	log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
  	return 1;
  }
  
  static int t4_uld_state_change(void *handle, enum cxgb4_state state)
  {
  	struct cxgbi_device *cdev = handle;
  
  	switch (state) {
  	case CXGB4_STATE_UP:
  		pr_info("cdev 0x%p, UP.\n", cdev);
  		break;
  	case CXGB4_STATE_START_RECOVERY:
  		pr_info("cdev 0x%p, RECOVERY.\n", cdev);
  		/* close all connections */
  		break;
  	case CXGB4_STATE_DOWN:
  		pr_info("cdev 0x%p, DOWN.\n", cdev);
  		break;
  	case CXGB4_STATE_DETACH:
  		pr_info("cdev 0x%p, DETACH.\n", cdev);
  		cxgbi_device_unregister(cdev);
  		break;
  	default:
  		pr_info("cdev 0x%p, unknown state %d.\n", cdev, state);
  		break;
  	}
  	return 0;
  }
  
  static int __init cxgb4i_init_module(void)
  {
  	int rc;
  
  	printk(KERN_INFO "%s", version);
  
  	rc = cxgbi_iscsi_init(&cxgb4i_iscsi_transport, &cxgb4i_stt);
  	if (rc < 0)
  		return rc;
  	cxgb4_register_uld(CXGB4_ULD_ISCSI, &cxgb4i_uld_info);
  
  	return 0;
  }
  
  static void __exit cxgb4i_exit_module(void)
  {
  	cxgb4_unregister_uld(CXGB4_ULD_ISCSI);
  	cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T4);
  	cxgbi_iscsi_cleanup(&cxgb4i_iscsi_transport, &cxgb4i_stt);
  }
  
  module_init(cxgb4i_init_module);
  module_exit(cxgb4i_exit_module);
  