text: /*
   * zfcp device driver
   *
   * Interface to Linux SCSI midlayer.
   *
   * Copyright IBM Corporation 2002, 2010
   */
  
  #define KMSG_COMPONENT "zfcp"
  #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/slab.h>
  #include <scsi/fc/fc_fcp.h>
  #include <scsi/scsi_eh.h>
  #include <linux/atomic.h>
  #include "zfcp_ext.h"
  #include "zfcp_dbf.h"
  #include "zfcp_fc.h"
  #include "zfcp_reqlist.h"
  
  static unsigned int default_depth = 32;
  module_param_named(queue_depth, default_depth, uint, 0600);
  MODULE_PARM_DESC(queue_depth, "Default queue depth for new SCSI devices");
  
  static bool enable_dif;
  module_param_named(dif, enable_dif, bool, 0400);
  MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support");
  
  static bool allow_lun_scan = 1;
  module_param(allow_lun_scan, bool, 0600);
  MODULE_PARM_DESC(allow_lun_scan, "For NPIV, scan and attach all storage LUNs");
  
  static int zfcp_scsi_change_queue_depth(struct scsi_device *sdev, int depth,
  					int reason)
  {
  	switch (reason) {
  	case SCSI_QDEPTH_DEFAULT:
  		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  		break;
  	case SCSI_QDEPTH_QFULL:
  		scsi_track_queue_full(sdev, depth);
  		break;
  	case SCSI_QDEPTH_RAMP_UP:
  		scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
  		break;
  	default:
  		return -EOPNOTSUPP;
  	}
  	return sdev->queue_depth;
  }
  
  static void zfcp_scsi_slave_destroy(struct scsi_device *sdev)
  {
  	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  
  	/* if previous slave_alloc returned early, there is nothing to do */
  	if (!zfcp_sdev->port)
  		return;
  
  	zfcp_erp_lun_shutdown_wait(sdev, "scssd_1");
  	put_device(&zfcp_sdev->port->dev);
  }
  
  static int zfcp_scsi_slave_configure(struct scsi_device *sdp)
  {
  	if (sdp->tagged_supported)
  		scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, default_depth);
  	else
  		scsi_adjust_queue_depth(sdp, 0, 1);
  	return 0;
  }
  
  static void zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
  {
  	set_host_byte(scpnt, result);
  	zfcp_dbf_scsi_fail_send(scpnt);
  	scpnt->scsi_done(scpnt);
  }
  
  static
  int zfcp_scsi_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scpnt)
  {
  	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  	struct fc_rport *rport = starget_to_rport(scsi_target(scpnt->device));
  	int    status, scsi_result, ret;
  
  	/* reset the status for this request */
  	scpnt->result = 0;
  	scpnt->host_scribble = NULL;
  
  	scsi_result = fc_remote_port_chkready(rport);
  	if (unlikely(scsi_result)) {
  		scpnt->result = scsi_result;
  		zfcp_dbf_scsi_fail_send(scpnt);
  		scpnt->scsi_done(scpnt);
  		return 0;
  	}
  
  	status = atomic_read(&zfcp_sdev->status);
  	if (unlikely(status & ZFCP_STATUS_COMMON_ERP_FAILED) &&
  		     !(atomic_read(&zfcp_sdev->port->status) &
  		       ZFCP_STATUS_COMMON_ERP_FAILED)) {
  		/* only LUN access denied, but port is good
  		 * not covered by FC transport, have to fail here */
  		zfcp_scsi_command_fail(scpnt, DID_ERROR);
  		return 0;
  	}
  
  	if (unlikely(!(status & ZFCP_STATUS_COMMON_UNBLOCKED))) {
  		/* This could be either
  		 * open LUN pending: this is temporary, will result in
  		 *	open LUN or ERP_FAILED, so retry command
  		 * call to rport_delete pending: mimic retry from
  		 * 	fc_remote_port_chkready until rport is BLOCKED
  		 */
  		zfcp_scsi_command_fail(scpnt, DID_IMM_RETRY);
  		return 0;
  	}
  
  	ret = zfcp_fsf_fcp_cmnd(scpnt);
  	if (unlikely(ret == -EBUSY))
  		return SCSI_MLQUEUE_DEVICE_BUSY;
  	else if (unlikely(ret < 0))
  		return SCSI_MLQUEUE_HOST_BUSY;
  
  	return ret;
  }
  
  static int zfcp_scsi_slave_alloc(struct scsi_device *sdev)
  {
  	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
  	struct zfcp_adapter *adapter =
  		(struct zfcp_adapter *) sdev->host->hostdata[0];
  	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
  	struct zfcp_port *port;
  	struct zfcp_unit *unit;
  	int npiv = adapter->connection_features & FSF_FEATURE_NPIV_MODE;
  
  	port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
  	if (!port)
  		return -ENXIO;
  
  	unit = zfcp_unit_find(port, zfcp_scsi_dev_lun(sdev));
  	if (unit)
  		put_device(&unit->dev);
  
  	if (!unit && !(allow_lun_scan && npiv)) {
  		put_device(&port->dev);
  		return -ENXIO;
  	}
  
  	zfcp_sdev->port = port;
  	zfcp_sdev->latencies.write.channel.min = 0xFFFFFFFF;
  	zfcp_sdev->latencies.write.fabric.min = 0xFFFFFFFF;
  	zfcp_sdev->latencies.read.channel.min = 0xFFFFFFFF;
  	zfcp_sdev->latencies.read.fabric.min = 0xFFFFFFFF;
  	zfcp_sdev->latencies.cmd.channel.min = 0xFFFFFFFF;
  	zfcp_sdev->latencies.cmd.fabric.min = 0xFFFFFFFF;
  	spin_lock_init(&zfcp_sdev->latencies.lock);
  
  	zfcp_erp_set_lun_status(sdev, ZFCP_STATUS_COMMON_RUNNING);
  	zfcp_erp_lun_reopen(sdev, 0, "scsla_1");
  	zfcp_erp_wait(port->adapter);
  
  	return 0;
  }
  
  static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
  {
  	struct Scsi_Host *scsi_host = scpnt->device->host;
  	struct zfcp_adapter *adapter =
  		(struct zfcp_adapter *) scsi_host->hostdata[0];
  	struct zfcp_fsf_req *old_req, *abrt_req;
  	unsigned long flags;
  	unsigned long old_reqid = (unsigned long) scpnt->host_scribble;
  	int retval = SUCCESS, ret;
  	int retry = 3;
  	char *dbf_tag;
  
  	/* avoid race condition between late normal completion and abort */
  	write_lock_irqsave(&adapter->abort_lock, flags);
  
  	old_req = zfcp_reqlist_find(adapter->req_list, old_reqid);
  	if (!old_req) {
  		write_unlock_irqrestore(&adapter->abort_lock, flags);
  		zfcp_dbf_scsi_abort("abrt_or", scpnt, NULL);
  		return FAILED; /* completion could be in progress */
  	}
  	old_req->data = NULL;
  
  	/* don't access old fsf_req after releasing the abort_lock */
  	write_unlock_irqrestore(&adapter->abort_lock, flags);
  
  	while (retry--) {
  		abrt_req = zfcp_fsf_abort_fcp_cmnd(scpnt);
  		if (abrt_req)
  			break;
  
  		zfcp_erp_wait(adapter);
  		ret = fc_block_scsi_eh(scpnt);
  		if (ret) {
  			zfcp_dbf_scsi_abort("abrt_bl", scpnt, NULL);
  			return ret;
  		}
  		if (!(atomic_read(&adapter->status) &
  		      ZFCP_STATUS_COMMON_RUNNING)) {
  			zfcp_dbf_scsi_abort("abrt_ru", scpnt, NULL);
  			return SUCCESS;
  		}
  	}
  	if (!abrt_req) {
  		zfcp_dbf_scsi_abort("abrt_ar", scpnt, NULL);
  		return FAILED;
  	}
  
  	wait_for_completion(&abrt_req->completion);
  
  	if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED)
  		dbf_tag = "abrt_ok";
  	else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED)
  		dbf_tag = "abrt_nn";
  	else {
  		dbf_tag = "abrt_fa";
  		retval = FAILED;
  	}
  	zfcp_dbf_scsi_abort(dbf_tag, scpnt, abrt_req);
  	zfcp_fsf_req_free(abrt_req);
  	return retval;
  }
  
  static int zfcp_task_mgmt_function(struct scsi_cmnd *scpnt, u8 tm_flags)
  {
  	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
  	struct zfcp_fsf_req *fsf_req = NULL;
  	int retval = SUCCESS, ret;
  	int retry = 3;
  
  	while (retry--) {
  		fsf_req = zfcp_fsf_fcp_task_mgmt(scpnt, tm_flags);
  		if (fsf_req)
  			break;
  
  		zfcp_erp_wait(adapter);
  		ret = fc_block_scsi_eh(scpnt);
  		if (ret)
  			return ret;
  
  		if (!(atomic_read(&adapter->status) &
  		      ZFCP_STATUS_COMMON_RUNNING)) {
  			zfcp_dbf_scsi_devreset("nres", scpnt, tm_flags);
  			return SUCCESS;
  		}
  	}
  	if (!fsf_req)
  		return FAILED;
  
  	wait_for_completion(&fsf_req->completion);
  
  	if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
  		zfcp_dbf_scsi_devreset("fail", scpnt, tm_flags);
  		retval = FAILED;
  	} else
  		zfcp_dbf_scsi_devreset("okay", scpnt, tm_flags);
  
  	zfcp_fsf_req_free(fsf_req);
  	return retval;
  }
  
  static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
  {
  	return zfcp_task_mgmt_function(scpnt, FCP_TMF_LUN_RESET);
  }
  
  static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
  {
  	return zfcp_task_mgmt_function(scpnt, FCP_TMF_TGT_RESET);
  }
  
  static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
  {
  	struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device);
  	struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
  	int ret;
  
  	zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
  	zfcp_erp_wait(adapter);
  	ret = fc_block_scsi_eh(scpnt);
  	if (ret)
  		return ret;
  
  	return SUCCESS;
  }
  
  struct scsi_transport_template *zfcp_scsi_transport_template;
  
  static struct scsi_host_template zfcp_scsi_host_template = {
  	.module			 = THIS_MODULE,
  	.name			 = "zfcp",
  	.queuecommand		 = zfcp_scsi_queuecommand,
  	.eh_abort_handler	 = zfcp_scsi_eh_abort_handler,
  	.eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
  	.eh_target_reset_handler = zfcp_scsi_eh_target_reset_handler,
  	.eh_host_reset_handler	 = zfcp_scsi_eh_host_reset_handler,
  	.slave_alloc		 = zfcp_scsi_slave_alloc,
  	.slave_configure	 = zfcp_scsi_slave_configure,
  	.slave_destroy		 = zfcp_scsi_slave_destroy,
  	.change_queue_depth	 = zfcp_scsi_change_queue_depth,
  	.proc_name		 = "zfcp",
  	.can_queue		 = 4096,
  	.this_id		 = -1,
  	.sg_tablesize		 = 1, /* adjusted later */
  	.max_sectors		 = 8, /* adjusted later */
  	.dma_boundary		 = ZFCP_QDIO_SBALE_LEN - 1,
  	.cmd_per_lun		 = 1,
  	.use_clustering		 = 1,
  	.shost_attrs		 = zfcp_sysfs_shost_attrs,
  	.sdev_attrs		 = zfcp_sysfs_sdev_attrs,
  };
  
  /**
   * zfcp_scsi_adapter_register - Register SCSI and FC host with SCSI midlayer
   * @adapter: The zfcp adapter to register with the SCSI midlayer
   */
  int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter)
  {
  	struct ccw_dev_id dev_id;
  
  	if (adapter->scsi_host)
  		return 0;
  
  	ccw_device_get_id(adapter->ccw_device, &dev_id);
  	/* register adapter as SCSI host with mid layer of SCSI stack */
  	adapter->scsi_host = scsi_host_alloc(&zfcp_scsi_host_template,
  					     sizeof (struct zfcp_adapter *));
  	if (!adapter->scsi_host) {
  		dev_err(&adapter->ccw_device->dev,
  			"Registering the FCP device with the "
  			"SCSI stack failed\n");
  		return -EIO;
  	}
  
  	/* tell the SCSI stack some characteristics of this adapter */
  	adapter->scsi_host->max_id = 511;
  	adapter->scsi_host->max_lun = 0xFFFFFFFF;
  	adapter->scsi_host->max_channel = 0;
  	adapter->scsi_host->unique_id = dev_id.devno;
  	adapter->scsi_host->max_cmd_len = 16; /* in struct fcp_cmnd */
  	adapter->scsi_host->transportt = zfcp_scsi_transport_template;
  
  	adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
  
  	if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
  		scsi_host_put(adapter->scsi_host);
  		return -EIO;
  	}
  
  	return 0;
  }
  
  /**
   * zfcp_scsi_adapter_unregister - Unregister SCSI and FC host from SCSI midlayer
   * @adapter: The zfcp adapter to unregister.
   */
  void zfcp_scsi_adapter_unregister(struct zfcp_adapter *adapter)
  {
  	struct Scsi_Host *shost;
  	struct zfcp_port *port;
  
  	shost = adapter->scsi_host;
  	if (!shost)
  		return;
  
  	read_lock_irq(&adapter->port_list_lock);
  	list_for_each_entry(port, &adapter->port_list, list)
  		port->rport = NULL;
  	read_unlock_irq(&adapter->port_list_lock);
  
  	fc_remove_host(shost);
  	scsi_remove_host(shost);
  	scsi_host_put(shost);
  	adapter->scsi_host = NULL;
  }
  
  static struct fc_host_statistics*
  zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
  {
  	struct fc_host_statistics *fc_stats;
  
  	if (!adapter->fc_stats) {
  		fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
  		if (!fc_stats)
  			return NULL;
  		adapter->fc_stats = fc_stats; /* freed in adapter_release */
  	}
  	memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
  	return adapter->fc_stats;
  }
  
  static void zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
  				      struct fsf_qtcb_bottom_port *data,
  				      struct fsf_qtcb_bottom_port *old)
  {
  	fc_stats->seconds_since_last_reset =
  		data->seconds_since_last_reset - old->seconds_since_last_reset;
  	fc_stats->tx_frames = data->tx_frames - old->tx_frames;
  	fc_stats->tx_words = data->tx_words - old->tx_words;
  	fc_stats->rx_frames = data->rx_frames - old->rx_frames;
  	fc_stats->rx_words = data->rx_words - old->rx_words;
  	fc_stats->lip_count = data->lip - old->lip;
  	fc_stats->nos_count = data->nos - old->nos;
  	fc_stats->error_frames = data->error_frames - old->error_frames;
  	fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
  	fc_stats->link_failure_count = data->link_failure - old->link_failure;
  	fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
  	fc_stats->loss_of_signal_count =
  		data->loss_of_signal - old->loss_of_signal;
  	fc_stats->prim_seq_protocol_err_count =
  		data->psp_error_counts - old->psp_error_counts;
  	fc_stats->invalid_tx_word_count =
  		data->invalid_tx_words - old->invalid_tx_words;
  	fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
  	fc_stats->fcp_input_requests =
  		data->input_requests - old->input_requests;
  	fc_stats->fcp_output_requests =
  		data->output_requests - old->output_requests;
  	fc_stats->fcp_control_requests =
  		data->control_requests - old->control_requests;
  	fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
  	fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
  }
  
  static void zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
  				   struct fsf_qtcb_bottom_port *data)
  {
  	fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
  	fc_stats->tx_frames = data->tx_frames;
  	fc_stats->tx_words = data->tx_words;
  	fc_stats->rx_frames = data->rx_frames;
  	fc_stats->rx_words = data->rx_words;
  	fc_stats->lip_count = data->lip;
  	fc_stats->nos_count = data->nos;
  	fc_stats->error_frames = data->error_frames;
  	fc_stats->dumped_frames = data->dumped_frames;
  	fc_stats->link_failure_count = data->link_failure;
  	fc_stats->loss_of_sync_count = data->loss_of_sync;
  	fc_stats->loss_of_signal_count = data->loss_of_signal;
  	fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
  	fc_stats->invalid_tx_word_count = data->invalid_tx_words;
  	fc_stats->invalid_crc_count = data->invalid_crcs;
  	fc_stats->fcp_input_requests = data->input_requests;
  	fc_stats->fcp_output_requests = data->output_requests;
  	fc_stats->fcp_control_requests = data->control_requests;
  	fc_stats->fcp_input_megabytes = data->input_mb;
  	fc_stats->fcp_output_megabytes = data->output_mb;
  }
  
  static struct fc_host_statistics *zfcp_get_fc_host_stats(struct Scsi_Host *host)
  {
  	struct zfcp_adapter *adapter;
  	struct fc_host_statistics *fc_stats;
  	struct fsf_qtcb_bottom_port *data;
  	int ret;
  
  	adapter = (struct zfcp_adapter *)host->hostdata[0];
  	fc_stats = zfcp_init_fc_host_stats(adapter);
  	if (!fc_stats)
  		return NULL;
  
  	data = kzalloc(sizeof(*data), GFP_KERNEL);
  	if (!data)
  		return NULL;
  
  	ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
  	if (ret) {
  		kfree(data);
  		return NULL;
  	}
  
  	if (adapter->stats_reset &&
  	    ((jiffies/HZ - adapter->stats_reset) <
  	     data->seconds_since_last_reset))
  		zfcp_adjust_fc_host_stats(fc_stats, data,
  					  adapter->stats_reset_data);
  	else
  		zfcp_set_fc_host_stats(fc_stats, data);
  
  	kfree(data);
  	return fc_stats;
  }
  
  static void zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
  {
  	struct zfcp_adapter *adapter;
  	struct fsf_qtcb_bottom_port *data;
  	int ret;
  
  	adapter = (struct zfcp_adapter *)shost->hostdata[0];
  	data = kzalloc(sizeof(*data), GFP_KERNEL);
  	if (!data)
  		return;
  
  	ret = zfcp_fsf_exchange_port_data_sync(adapter->qdio, data);
  	if (ret)
  		kfree(data);
  	else {
  		adapter->stats_reset = jiffies/HZ;
  		kfree(adapter->stats_reset_data);
  		adapter->stats_reset_data = data; /* finally freed in
  						     adapter_release */
  	}
  }
  
  static void zfcp_get_host_port_state(struct Scsi_Host *shost)
  {
  	struct zfcp_adapter *adapter =
  		(struct zfcp_adapter *)shost->hostdata[0];
  	int status = atomic_read(&adapter->status);
  
  	if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
  	    !(status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED))
  		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
  	else if (status & ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED)
  		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
  	else if (status & ZFCP_STATUS_COMMON_ERP_FAILED)
  		fc_host_port_state(shost) = FC_PORTSTATE_ERROR;
  	else
  		fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
  }
  
  static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
  {
  	rport->dev_loss_tmo = timeout;
  }
  
  /**
   * zfcp_scsi_terminate_rport_io - Terminate all I/O on a rport
   * @rport: The FC rport where to teminate I/O
   *
   * Abort all pending SCSI commands for a port by closing the
   * port. Using a reopen avoids a conflict with a shutdown
   * overwriting a reopen. The "forced" ensures that a disappeared port
   * is not opened again as valid due to the cached plogi data in
   * non-NPIV mode.
   */
  static void zfcp_scsi_terminate_rport_io(struct fc_rport *rport)
  {
  	struct zfcp_port *port;
  	struct Scsi_Host *shost = rport_to_shost(rport);
  	struct zfcp_adapter *adapter =
  		(struct zfcp_adapter *)shost->hostdata[0];
  
  	port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
  
  	if (port) {
  		zfcp_erp_port_forced_reopen(port, 0, "sctrpi1");
  		put_device(&port->dev);
  	}
  }
  
  static void zfcp_scsi_rport_register(struct zfcp_port *port)
  {
  	struct fc_rport_identifiers ids;
  	struct fc_rport *rport;
  
  	if (port->rport)
  		return;
  
  	ids.node_name = port->wwnn;
  	ids.port_name = port->wwpn;
  	ids.port_id = port->d_id;
  	ids.roles = FC_RPORT_ROLE_FCP_TARGET;
  
  	rport = fc_remote_port_add(port->adapter->scsi_host, 0, &ids);
  	if (!rport) {
  		dev_err(&port->adapter->ccw_device->dev,
  			"Registering port 0x%016Lx failed\n",
  			(unsigned long long)port->wwpn);
  		return;
  	}
  
  	rport->maxframe_size = port->maxframe_size;
  	rport->supported_classes = port->supported_classes;
  	port->rport = rport;
  	port->starget_id = rport->scsi_target_id;
  
  	zfcp_unit_queue_scsi_scan(port);
  }
  
  static void zfcp_scsi_rport_block(struct zfcp_port *port)
  {
  	struct fc_rport *rport = port->rport;
  
  	if (rport) {
  		fc_remote_port_delete(rport);
  		port->rport = NULL;
  	}
  }
  
  void zfcp_scsi_schedule_rport_register(struct zfcp_port *port)
  {
  	get_device(&port->dev);
  	port->rport_task = RPORT_ADD;
  
  	if (!queue_work(port->adapter->work_queue, &port->rport_work))
  		put_device(&port->dev);
  }
  
  void zfcp_scsi_schedule_rport_block(struct zfcp_port *port)
  {
  	get_device(&port->dev);
  	port->rport_task = RPORT_DEL;
  
  	if (port->rport && queue_work(port->adapter->work_queue,
  				      &port->rport_work))
  		return;
  
  	put_device(&port->dev);
  }
  
  void zfcp_scsi_schedule_rports_block(struct zfcp_adapter *adapter)
  {
  	unsigned long flags;
  	struct zfcp_port *port;
  
  	read_lock_irqsave(&adapter->port_list_lock, flags);
  	list_for_each_entry(port, &adapter->port_list, list)
  		zfcp_scsi_schedule_rport_block(port);
  	read_unlock_irqrestore(&adapter->port_list_lock, flags);
  }
  
  void zfcp_scsi_rport_work(struct work_struct *work)
  {
  	struct zfcp_port *port = container_of(work, struct zfcp_port,
  					      rport_work);
  
  	while (port->rport_task) {
  		if (port->rport_task == RPORT_ADD) {
  			port->rport_task = RPORT_NONE;
  			zfcp_scsi_rport_register(port);
  		} else {
  			port->rport_task = RPORT_NONE;
  			zfcp_scsi_rport_block(port);
  		}
  	}
  
  	put_device(&port->dev);
  }
  
  /**
   * zfcp_scsi_set_prot - Configure DIF/DIX support in scsi_host
   * @adapter: The adapter where to configure DIF/DIX for the SCSI host
   */
  void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
  {
  	unsigned int mask = 0;
  	unsigned int data_div;
  	struct Scsi_Host *shost = adapter->scsi_host;
  
  	data_div = atomic_read(&adapter->status) &
  		   ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED;
  
  	if (enable_dif &&
  	    adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1)
  		mask |= SHOST_DIF_TYPE1_PROTECTION;
  
  	if (enable_dif && data_div &&
  	    adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
  		mask |= SHOST_DIX_TYPE1_PROTECTION;
  		scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
  		shost->sg_prot_tablesize = adapter->qdio->max_sbale_per_req / 2;
  		shost->sg_tablesize = adapter->qdio->max_sbale_per_req / 2;
  		shost->max_sectors = shost->sg_tablesize * 8;
  	}
  
  	scsi_host_set_prot(shost, mask);
  }
  
  /**
   * zfcp_scsi_dif_sense_error - Report DIF/DIX error as driver sense error
   * @scmd: The SCSI command to report the error for
   * @ascq: The ASCQ to put in the sense buffer
   *
   * See the error handling in sd_done for the sense codes used here.
   * Set DID_SOFT_ERROR to retry the request, if possible.
   */
  void zfcp_scsi_dif_sense_error(struct scsi_cmnd *scmd, int ascq)
  {
  	scsi_build_sense_buffer(1, scmd->sense_buffer,
  				ILLEGAL_REQUEST, 0x10, ascq);
  	set_driver_byte(scmd, DRIVER_SENSE);
  	scmd->result |= SAM_STAT_CHECK_CONDITION;
  	set_host_byte(scmd, DID_SOFT_ERROR);
  }
  
  struct fc_function_template zfcp_transport_functions = {
  	.show_starget_port_id = 1,
  	.show_starget_port_name = 1,
  	.show_starget_node_name = 1,
  	.show_rport_supported_classes = 1,
  	.show_rport_maxframe_size = 1,
  	.show_rport_dev_loss_tmo = 1,
  	.show_host_node_name = 1,
  	.show_host_port_name = 1,
  	.show_host_permanent_port_name = 1,
  	.show_host_supported_classes = 1,
  	.show_host_supported_fc4s = 1,
  	.show_host_supported_speeds = 1,
  	.show_host_maxframe_size = 1,
  	.show_host_serial_number = 1,
  	.get_fc_host_stats = zfcp_get_fc_host_stats,
  	.reset_fc_host_stats = zfcp_reset_fc_host_stats,
  	.set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
  	.get_host_port_state = zfcp_get_host_port_state,
  	.terminate_rport_io = zfcp_scsi_terminate_rport_io,
  	.show_host_port_state = 1,
  	.show_host_active_fc4s = 1,
  	.bsg_request = zfcp_fc_exec_bsg_job,
  	.bsg_timeout = zfcp_fc_timeout_bsg_job,
  	/* no functions registered for following dynamic attributes but
  	   directly set by LLDD */
  	.show_host_port_type = 1,
  	.show_host_symbolic_name = 1,
  	.show_host_speed = 1,
  	.show_host_port_id = 1,
  	.dd_bsg_size = sizeof(struct zfcp_fsf_ct_els),
  };
  