diff options
Diffstat (limited to 'drivers/s390/scsi/zfcp_scsi.c')
| -rw-r--r-- | drivers/s390/scsi/zfcp_scsi.c | 988 |
1 files changed, 988 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..526ac240d --- /dev/null +++ b/drivers/s390/scsi/zfcp_scsi.c @@ -0,0 +1,988 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * zfcp device driver + * + * Interface to Linux SCSI midlayer. + * + * Copyright IBM Corp. 2002, 2020 + */ + +#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 data integrity support (default off)"); + +bool zfcp_experimental_dix; +module_param_named(dix, zfcp_experimental_dix, bool, 0400); +MODULE_PARM_DESC(dix, "Enable experimental DIX (data integrity extension) support which implies DIF support (default off)"); + +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); + 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); + 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; + + mutex_lock(&zfcp_sysfs_port_units_mutex); + if (zfcp_sysfs_port_is_removing(port)) { + /* port is already gone */ + mutex_unlock(&zfcp_sysfs_port_units_mutex); + put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */ + return -ENXIO; + } + mutex_unlock(&zfcp_sysfs_port_units_mutex); + + 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 || + zfcp_fsf_req_is_status_read_buffer(old_req) || + old_req->qtcb->header.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; + + if (!(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) { + zfcp_erp_port_forced_reopen_all(adapter, 0, "schrh_p"); + zfcp_erp_wait(adapter); + } + 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 */ + /* report size limit per scatter-gather segment */ + .max_segment_size = ZFCP_QDIO_SBALE_LEN, + .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, + .shost_groups = zfcp_sysfs_shost_attr_groups, + .sdev_groups = zfcp_sysfs_sdev_attr_groups, + .track_queue_depth = 1, + .supported_mode = MODE_INITIATOR, +}; + +/** + * zfcp_scsi_adapter_register() - Allocate and register SCSI and FC host with + * SCSI midlayer + * @adapter: The zfcp adapter to register with the SCSI midlayer + * + * Allocates the SCSI host object for the given adapter, sets basic properties + * (such as the transport template, QDIO limits, ...), and registers it with + * the midlayer. + * + * During registration with the midlayer the corresponding FC host object for + * the referenced transport class is also implicitely allocated. + * + * Upon success adapter->scsi_host is set, and upon failure it remains NULL. If + * adapter->scsi_host is already set, nothing is done. + * + * Return: + * * 0 - Allocation and registration was successful + * * -EEXIST - SCSI and FC host did already exist, nothing was done, nothing + * was changed + * * -EIO - Allocation or registration failed + */ +int zfcp_scsi_adapter_register(struct zfcp_adapter *adapter) +{ + struct ccw_dev_id dev_id; + + if (adapter->scsi_host) + return -EEXIST; + + 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) + goto err_out; + + /* 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; + + /* make all basic properties known at registration time */ + zfcp_qdio_shost_update(adapter, adapter->qdio); + zfcp_scsi_set_prot(adapter); + + 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); + goto err_out; + } + + return 0; +err_out: + adapter->scsi_host = NULL; + dev_err(&adapter->ccw_device->dev, + "Registering the FCP device with the SCSI stack failed\n"); + return -EIO; +} + +/** + * 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 != 0 && ret != -EAGAIN) { + 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 != 0 && ret != -EAGAIN) + 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 || zfcp_experimental_dix) && + adapter->adapter_features & FSF_FEATURE_DIF_PROT_TYPE1) + mask |= SHOST_DIF_TYPE1_PROTECTION; + + if (zfcp_experimental_dix && 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(scmd, 1, ILLEGAL_REQUEST, 0x10, ascq); + set_host_byte(scmd, DID_SOFT_ERROR); +} + +void zfcp_scsi_shost_update_config_data( + struct zfcp_adapter *const adapter, + const struct fsf_qtcb_bottom_config *const bottom, + const bool bottom_incomplete) +{ + struct Scsi_Host *const shost = adapter->scsi_host; + const struct fc_els_flogi *nsp, *plogi; + + if (shost == NULL) + return; + + snprintf(fc_host_firmware_version(shost), FC_VERSION_STRING_SIZE, + "0x%08x", bottom->lic_version); + + if (adapter->adapter_features & FSF_FEATURE_HBAAPI_MANAGEMENT) { + snprintf(fc_host_hardware_version(shost), + FC_VERSION_STRING_SIZE, + "0x%08x", bottom->hardware_version); + memcpy(fc_host_serial_number(shost), bottom->serial_number, + min(FC_SERIAL_NUMBER_SIZE, 17)); + EBCASC(fc_host_serial_number(shost), + min(FC_SERIAL_NUMBER_SIZE, 17)); + } + + /* adjust pointers for missing command code */ + nsp = (struct fc_els_flogi *) ((u8 *)&bottom->nport_serv_param + - sizeof(u32)); + plogi = (struct fc_els_flogi *) ((u8 *)&bottom->plogi_payload + - sizeof(u32)); + + snprintf(fc_host_manufacturer(shost), FC_SERIAL_NUMBER_SIZE, "%s", + "IBM"); + fc_host_port_name(shost) = be64_to_cpu(nsp->fl_wwpn); + fc_host_node_name(shost) = be64_to_cpu(nsp->fl_wwnn); + fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3; + + zfcp_scsi_set_prot(adapter); + + /* do not evaluate invalid fields */ + if (bottom_incomplete) + return; + + fc_host_port_id(shost) = ntoh24(bottom->s_id); + fc_host_speed(shost) = + zfcp_fsf_convert_portspeed(bottom->fc_link_speed); + + snprintf(fc_host_model(shost), FC_SYMBOLIC_NAME_SIZE, "0x%04x", + bottom->adapter_type); + + switch (bottom->fc_topology) { + case FSF_TOPO_P2P: + fc_host_port_type(shost) = FC_PORTTYPE_PTP; + fc_host_fabric_name(shost) = 0; + break; + case FSF_TOPO_FABRIC: + fc_host_fabric_name(shost) = be64_to_cpu(plogi->fl_wwnn); + if (bottom->connection_features & FSF_FEATURE_NPIV_MODE) + fc_host_port_type(shost) = FC_PORTTYPE_NPIV; + else + fc_host_port_type(shost) = FC_PORTTYPE_NPORT; + break; + case FSF_TOPO_AL: + fc_host_port_type(shost) = FC_PORTTYPE_NLPORT; + fallthrough; + default: + fc_host_fabric_name(shost) = 0; + break; + } +} + +void zfcp_scsi_shost_update_port_data( + struct zfcp_adapter *const adapter, + const struct fsf_qtcb_bottom_port *const bottom) +{ + struct Scsi_Host *const shost = adapter->scsi_host; + + if (shost == NULL) + return; + + fc_host_permanent_port_name(shost) = bottom->wwpn; + fc_host_maxframe_size(shost) = bottom->maximum_frame_size; + fc_host_supported_speeds(shost) = + zfcp_fsf_convert_portspeed(bottom->supported_speed); + memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types, + FC_FC4_LIST_SIZE); + memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types, + FC_FC4_LIST_SIZE); +} + +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, + .show_host_manufacturer = 1, + .show_host_model = 1, + .show_host_hardware_version = 1, + .show_host_firmware_version = 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, + .show_host_fabric_name = 1, + .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), +}; 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