Initial import

1 files changed, 713 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
new file mode 100644
index 000000000..75f4bfc2b
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -0,0 +1,713 @@
+/*
+ * zfcp device driver
+ *
+ * Interface to Linux SCSI midlayer.
+ *
+ * Copyright IBM Corp. 2002, 2013
+ */
+
+#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 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_change_queue_depth(sdp, default_depth);
+	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	 = scsi_change_queue_depth,
+	.proc_name		 = "zfcp",
+	.can_queue		 = 4096,
+	.this_id		 = -1,
+	.sg_tablesize		 = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
+				     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2),
+				   /* GCD, adjusted later */
+	.max_sectors		 = (((QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
+				     * ZFCP_QDIO_MAX_SBALS_PER_REQ) - 2) * 8,
+				   /* GCD, 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,
+	.track_queue_depth	 = 1,
+};
+
+/**
+ * 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),
+};