/* * 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 #include #include #include #include #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; #ifdef CONFIG_ZFCP_DIF module_param_named(dif, enable_dif, bool, 0600); MODULE_PARM_DESC(dif, "Enable DIF/DIX data integrity support"); #endif 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); 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) { struct zfcp_adapter *adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0]; set_host_byte(scpnt, result); zfcp_dbf_scsi_fail_send(adapter->dbf, scpnt); scpnt->scsi_done(scpnt); } static int zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt, void (*done) (struct scsi_cmnd *)) { struct zfcp_scsi_dev *zfcp_sdev = sdev_to_zfcp(scpnt->device); struct zfcp_adapter *adapter = zfcp_sdev->port->adapter; 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; scpnt->scsi_done = done; scsi_result = fc_remote_port_chkready(rport); if (unlikely(scsi_result)) { scpnt->result = scsi_result; zfcp_dbf_scsi_fail_send(adapter->dbf, 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; 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 && !(adapter->connection_features & FSF_FEATURE_NPIV_MODE)) { 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", NULL); 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("lte1", adapter->dbf, scpnt, NULL, old_reqid); 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) return ret; if (!(atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_RUNNING)) { zfcp_dbf_scsi_abort("nres", adapter->dbf, scpnt, NULL, old_reqid); return SUCCESS; } } if (!abrt_req) return FAILED; wait_for_completion(&abrt_req->completion); if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) dbf_tag = "okay"; else if (abrt_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) dbf_tag = "lte2"; else { dbf_tag = "fail"; retval = FAILED; } zfcp_dbf_scsi_abort(dbf_tag, adapter->dbf, scpnt, abrt_req, old_reqid); 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", scpnt); zfcp_erp_wait(adapter); ret = fc_block_scsi_eh(scpnt); if (ret) return ret; return SUCCESS; } int zfcp_adapter_scsi_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_data.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_data.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; } void zfcp_adapter_scsi_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; return; } 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", NULL); 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_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2; shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2; } 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_speed = 1, .show_host_port_id = 1, .dd_bsg_size = sizeof(struct zfcp_fsf_ct_els), }; struct zfcp_data zfcp_data = { .scsi_host_template = { .name = "zfcp", .module = THIS_MODULE, .proc_name = "zfcp", .change_queue_depth = zfcp_scsi_change_queue_depth, .slave_alloc = zfcp_scsi_slave_alloc, .slave_configure = zfcp_scsi_slave_configure, .slave_destroy = zfcp_scsi_slave_destroy, .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, .can_queue = 4096, .this_id = -1, .sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ, .cmd_per_lun = 1, .use_clustering = 1, .sdev_attrs = zfcp_sysfs_sdev_attrs, .max_sectors = (ZFCP_QDIO_MAX_SBALES_PER_REQ * 8), .dma_boundary = ZFCP_QDIO_SBALE_LEN - 1, .shost_attrs = zfcp_sysfs_shost_attrs, }, };