v4.19.13 snapshot.
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
new file mode 100644
index 0000000..a8efcb3
--- /dev/null
+++ b/drivers/s390/scsi/zfcp_scsi.c
@@ -0,0 +1,855 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * zfcp device driver
+ *
+ * Interface to Linux SCSI midlayer.
+ *
+ * Copyright IBM Corp. 2002, 2018
+ */
+
+#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 = true;
+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
+ * 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;
+
+ zfcp_sdev->erp_action.adapter = adapter;
+ zfcp_sdev->erp_action.sdev = sdev;
+
+ port = zfcp_get_port_by_wwpn(adapter, rport->port_name);
+ if (!port)
+ return -ENXIO;
+
+ zfcp_sdev->erp_action.port = port;
+
+ 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_dbf_scsi_abort("abrt_wt", scpnt, NULL);
+ 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;
+}
+
+struct zfcp_scsi_req_filter {
+ u8 tmf_scope;
+ u32 lun_handle;
+ u32 port_handle;
+};
+
+static void zfcp_scsi_forget_cmnd(struct zfcp_fsf_req *old_req, void *data)
+{
+ struct zfcp_scsi_req_filter *filter =
+ (struct zfcp_scsi_req_filter *)data;
+
+ /* already aborted - prevent side-effects - or not a SCSI command */
+ if (old_req->data == NULL || old_req->fsf_command != FSF_QTCB_FCP_CMND)
+ return;
+
+ /* (tmf_scope == FCP_TMF_TGT_RESET || tmf_scope == FCP_TMF_LUN_RESET) */
+ if (old_req->qtcb->header.port_handle != filter->port_handle)
+ return;
+
+ if (filter->tmf_scope == FCP_TMF_LUN_RESET &&
+ old_req->qtcb->header.lun_handle != filter->lun_handle)
+ return;
+
+ zfcp_dbf_scsi_nullcmnd((struct scsi_cmnd *)old_req->data, old_req);
+ old_req->data = NULL;
+}
+
+static void zfcp_scsi_forget_cmnds(struct zfcp_scsi_dev *zsdev, u8 tm_flags)
+{
+ struct zfcp_adapter *adapter = zsdev->port->adapter;
+ struct zfcp_scsi_req_filter filter = {
+ .tmf_scope = FCP_TMF_TGT_RESET,
+ .port_handle = zsdev->port->handle,
+ };
+ unsigned long flags;
+
+ if (tm_flags == FCP_TMF_LUN_RESET) {
+ filter.tmf_scope = FCP_TMF_LUN_RESET;
+ filter.lun_handle = zsdev->lun_handle;
+ }
+
+ /*
+ * abort_lock secures against other processings - in the abort-function
+ * and normal cmnd-handler - of (struct zfcp_fsf_req *)->data
+ */
+ write_lock_irqsave(&adapter->abort_lock, flags);
+ zfcp_reqlist_apply_for_all(adapter->req_list, zfcp_scsi_forget_cmnd,
+ &filter);
+ write_unlock_irqrestore(&adapter->abort_lock, flags);
+}
+
+/**
+ * zfcp_scsi_task_mgmt_function() - Send a task management function (sync).
+ * @sdev: Pointer to SCSI device to send the task management command to.
+ * @tm_flags: Task management flags,
+ * here we only handle %FCP_TMF_TGT_RESET or %FCP_TMF_LUN_RESET.
+ */
+static int zfcp_scsi_task_mgmt_function(struct scsi_device *sdev, u8 tm_flags)
+{
+ struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(sdev);
+ struct zfcp_adapter *adapter = zfcp_sdev->port->adapter;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ struct zfcp_fsf_req *fsf_req = NULL;
+ int retval = SUCCESS, ret;
+ int retry = 3;
+
+ while (retry--) {
+ fsf_req = zfcp_fsf_fcp_task_mgmt(sdev, tm_flags);
+ if (fsf_req)
+ break;
+
+ zfcp_dbf_scsi_devreset("wait", sdev, tm_flags, NULL);
+ zfcp_erp_wait(adapter);
+ ret = fc_block_rport(rport);
+ if (ret) {
+ zfcp_dbf_scsi_devreset("fiof", sdev, tm_flags, NULL);
+ return ret;
+ }
+
+ if (!(atomic_read(&adapter->status) &
+ ZFCP_STATUS_COMMON_RUNNING)) {
+ zfcp_dbf_scsi_devreset("nres", sdev, tm_flags, NULL);
+ return SUCCESS;
+ }
+ }
+ if (!fsf_req) {
+ zfcp_dbf_scsi_devreset("reqf", sdev, tm_flags, NULL);
+ return FAILED;
+ }
+
+ wait_for_completion(&fsf_req->completion);
+
+ if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
+ zfcp_dbf_scsi_devreset("fail", sdev, tm_flags, fsf_req);
+ retval = FAILED;
+ } else {
+ zfcp_dbf_scsi_devreset("okay", sdev, tm_flags, fsf_req);
+ zfcp_scsi_forget_cmnds(zfcp_sdev, tm_flags);
+ }
+
+ zfcp_fsf_req_free(fsf_req);
+ return retval;
+}
+
+static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
+{
+ struct scsi_device *sdev = scpnt->device;
+
+ return zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_LUN_RESET);
+}
+
+static int zfcp_scsi_eh_target_reset_handler(struct scsi_cmnd *scpnt)
+{
+ struct scsi_target *starget = scsi_target(scpnt->device);
+ struct fc_rport *rport = starget_to_rport(starget);
+ struct Scsi_Host *shost = rport_to_shost(rport);
+ struct scsi_device *sdev = NULL, *tmp_sdev;
+ struct zfcp_adapter *adapter =
+ (struct zfcp_adapter *)shost->hostdata[0];
+ int ret;
+
+ shost_for_each_device(tmp_sdev, shost) {
+ if (tmp_sdev->id == starget->id) {
+ sdev = tmp_sdev;
+ break;
+ }
+ }
+ if (!sdev) {
+ ret = FAILED;
+ zfcp_dbf_scsi_eh("tr_nosd", adapter, starget->id, ret);
+ return ret;
+ }
+
+ ret = zfcp_scsi_task_mgmt_function(sdev, FCP_TMF_TGT_RESET);
+
+ /* release reference from above shost_for_each_device */
+ if (sdev)
+ scsi_device_put(tmp_sdev);
+
+ return ret;
+}
+
+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 = SUCCESS, fc_ret;
+
+ zfcp_erp_adapter_reopen(adapter, 0, "schrh_1");
+ zfcp_erp_wait(adapter);
+ fc_ret = fc_block_scsi_eh(scpnt);
+ if (fc_ret)
+ ret = fc_ret;
+
+ zfcp_dbf_scsi_eh("schrh_r", adapter, ~0, ret);
+ return ret;
+}
+
+/**
+ * zfcp_scsi_sysfs_host_reset() - Support scsi_host sysfs attribute host_reset.
+ * @shost: Pointer to Scsi_Host to perform action on.
+ * @reset_type: We support %SCSI_ADAPTER_RESET but not %SCSI_FIRMWARE_RESET.
+ *
+ * Return: 0 on %SCSI_ADAPTER_RESET, -%EOPNOTSUPP otherwise.
+ *
+ * This is similar to zfcp_sysfs_adapter_failed_store().
+ */
+static int zfcp_scsi_sysfs_host_reset(struct Scsi_Host *shost, int reset_type)
+{
+ struct zfcp_adapter *adapter =
+ (struct zfcp_adapter *)shost->hostdata[0];
+ int ret = 0;
+
+ if (reset_type != SCSI_ADAPTER_RESET) {
+ ret = -EOPNOTSUPP;
+ zfcp_dbf_scsi_eh("scshr_n", adapter, ~0, ret);
+ return ret;
+ }
+
+ zfcp_erp_adapter_reset_sync(adapter, "scshr_y");
+ return ret;
+}
+
+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_timed_out = fc_eh_timed_out,
+ .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,
+ .host_reset = zfcp_scsi_sysfs_host_reset,
+ .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,
+ .use_clustering = 1,
+ .shost_attrs = zfcp_sysfs_shost_attrs,
+ .sdev_attrs = zfcp_sysfs_sdev_attrs,
+ .track_queue_depth = 1,
+ .supported_mode = MODE_INITIATOR,
+};
+
+/**
+ * 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_scsi_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_scsi_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_scsi_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_scsi_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_scsi_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_scsi_adjust_fc_host_stats(fc_stats, data,
+ adapter->stats_reset_data);
+ else
+ zfcp_scsi_set_fc_host_stats(fc_stats, data);
+
+ kfree(data);
+ return fc_stats;
+}
+
+static void zfcp_scsi_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_scsi_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_scsi_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);
+ } else {
+ zfcp_erp_port_forced_no_port_dbf(
+ "sctrpin", adapter,
+ rport->port_name /* zfcp_scsi_rport_register */,
+ rport->port_id /* zfcp_scsi_rport_register */);
+ }
+}
+
+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;
+
+ zfcp_dbf_rec_trig_lock("scpaddy", port->adapter, port, NULL,
+ ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD,
+ ZFCP_PSEUDO_ERP_ACTION_RPORT_ADD);
+ 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) {
+ zfcp_dbf_rec_trig_lock("scpdely", port->adapter, port, NULL,
+ ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL,
+ ZFCP_PSEUDO_ERP_ACTION_RPORT_DEL);
+ 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);
+
+ set_worker_desc("zrp%c-%16llx",
+ (port->rport_task == RPORT_ADD) ? 'a' : 'd',
+ port->wwpn); /* < WORKER_DESC_LEN=24 */
+ 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_scsi_get_fc_host_stats,
+ .reset_fc_host_stats = zfcp_scsi_reset_fc_host_stats,
+ .set_rport_dev_loss_tmo = zfcp_scsi_set_rport_dev_loss_tmo,
+ .get_host_port_state = zfcp_scsi_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),
+};