2 * This file is part of the zfcp device driver for
3 * FCP adapters for IBM System z9 and zSeries.
5 * (C) Copyright IBM Corp. 2002, 2006
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI
25 #include <asm/atomic.h>
27 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
28 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
29 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
30 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
31 void (*done) (struct scsi_cmnd *));
32 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
33 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
34 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
35 static int zfcp_task_management_function(struct zfcp_unit *, u8,
38 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int,
39 unsigned int, unsigned int);
41 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
43 struct zfcp_data zfcp_data = {
44 .scsi_host_template = {
46 .module = THIS_MODULE,
48 .slave_alloc = zfcp_scsi_slave_alloc,
49 .slave_configure = zfcp_scsi_slave_configure,
50 .slave_destroy = zfcp_scsi_slave_destroy,
51 .queuecommand = zfcp_scsi_queuecommand,
52 .eh_abort_handler = zfcp_scsi_eh_abort_handler,
53 .eh_device_reset_handler = zfcp_scsi_eh_device_reset_handler,
54 .eh_host_reset_handler = zfcp_scsi_eh_host_reset_handler,
57 .sg_tablesize = ZFCP_MAX_SBALES_PER_REQ,
60 .sdev_attrs = zfcp_sysfs_sdev_attrs,
61 .max_sectors = ZFCP_MAX_SECTORS,
63 .driver_version = ZFCP_VERSION,
66 /* Find start of Response Information in FCP response unit*/
68 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
70 char *fcp_rsp_info_ptr;
73 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
75 return fcp_rsp_info_ptr;
78 /* Find start of Sense Information in FCP response unit*/
80 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
82 char *fcp_sns_info_ptr;
85 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
86 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
87 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
88 fcp_rsp_iu->fcp_rsp_len;
90 return fcp_sns_info_ptr;
94 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
96 int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
97 fcp_dl_t *fcp_dl_addr;
99 fcp_dl_addr = (fcp_dl_t *)
100 ((unsigned char *) fcp_cmd +
101 sizeof (struct fcp_cmnd_iu) + additional_length);
103 * fcp_dl_addr = start address of fcp_cmnd structure +
104 * size of fixed part + size of dynamically sized add_dcp_cdb field
105 * SEE FCP-2 documentation
111 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
113 return *zfcp_get_fcp_dl_ptr(fcp_cmd);
117 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
119 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
123 * note: it's a bit-or operation not an assignment
124 * regarding the specified byte
127 set_byte(int *result, char status, char pos)
129 *result |= status << (pos * 8);
133 set_host_byte(int *result, char status)
135 set_byte(result, status, 2);
139 set_driver_byte(int *result, char status)
141 set_byte(result, status, 3);
145 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
147 struct zfcp_adapter *adapter;
148 struct zfcp_unit *unit;
152 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
156 read_lock_irqsave(&zfcp_data.config_lock, flags);
157 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
158 if (unit && atomic_test_mask(ZFCP_STATUS_UNIT_REGISTERED,
160 sdp->hostdata = unit;
165 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
171 * zfcp_scsi_slave_destroy - called when scsi device is removed
173 * Remove reference to associated scsi device for an zfcp_unit.
174 * Mark zfcp_unit as failed. The scsi device might be deleted via sysfs
175 * or a scan for this device might have failed.
177 static void zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
179 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
182 zfcp_erp_wait(unit->port->adapter);
183 wait_event(unit->scsi_scan_wq,
184 atomic_test_mask(ZFCP_STATUS_UNIT_SCSI_WORK_PENDING,
185 &unit->status) == 0);
186 atomic_clear_mask(ZFCP_STATUS_UNIT_REGISTERED, &unit->status);
187 sdpnt->hostdata = NULL;
189 zfcp_erp_unit_failed(unit);
192 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
193 "address %p\n", sdpnt);
197 * called from scsi midlayer to allow finetuning of a device.
200 zfcp_scsi_slave_configure(struct scsi_device *sdp)
202 if (sdp->tagged_supported)
203 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
205 scsi_adjust_queue_depth(sdp, 0, 1);
210 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
211 * @scpnt: pointer to struct scsi_cmnd where result is set
212 * @result: result to be set in scpnt (e.g. DID_ERROR)
215 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
217 set_host_byte(&scpnt->result, result);
218 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
219 zfcp_scsi_dbf_event_result("fail", 4,
220 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
222 /* return directly */
223 scpnt->scsi_done(scpnt);
227 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
228 * zfcp_scsi_command_sync
229 * @adapter: adapter where scsi command is issued
230 * @unit: unit to which scsi command is sent
231 * @scpnt: scsi command to be sent
232 * @timer: timer to be started if request is successfully initiated
234 * Note: In scsi_done function must be set in scpnt.
237 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
238 struct scsi_cmnd *scpnt, int use_timer)
245 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
246 BUG_ON(scpnt->scsi_done == NULL);
248 if (unlikely(NULL == unit)) {
249 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
254 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
255 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
256 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
257 "0x%016Lx on adapter %s\n",
258 unit->fcp_lun, unit->port->wwpn,
259 zfcp_get_busid_by_adapter(adapter));
260 zfcp_scsi_command_fail(scpnt, DID_ERROR);
265 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
266 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
267 "on port 0x%016Lx in recovery\n",
268 zfcp_get_busid_by_unit(unit),
269 unit->fcp_lun, unit->port->wwpn);
270 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
274 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, use_timer,
275 ZFCP_REQ_AUTO_CLEANUP);
277 if (unlikely(tmp < 0)) {
278 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
279 retval = SCSI_MLQUEUE_HOST_BUSY;
287 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
289 struct completion *wait = (struct completion *) scpnt->SCp.ptr;
295 * zfcp_scsi_command_sync - send a SCSI command and wait for completion
296 * @unit: unit where command is sent to
297 * @scpnt: scsi command to be sent
298 * @use_timer: indicates whether timer should be setup or not
301 * Errors are indicated in scpnt->result
304 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
308 DECLARE_COMPLETION_ONSTACK(wait);
310 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
311 scpnt->scsi_done = zfcp_scsi_command_sync_handler;
312 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt,
315 wait_for_completion(&wait);
317 scpnt->SCp.ptr = NULL;
323 * function: zfcp_scsi_queuecommand
325 * purpose: enqueues a SCSI command to the specified target device
327 * returns: 0 - success, SCSI command enqueued
331 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
332 void (*done) (struct scsi_cmnd *))
334 struct zfcp_unit *unit;
335 struct zfcp_adapter *adapter;
337 /* reset the status for this request */
339 scpnt->host_scribble = NULL;
340 scpnt->scsi_done = done;
343 * figure out adapter and target device
344 * (stored there by zfcp_scsi_slave_alloc)
346 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
347 unit = (struct zfcp_unit *) scpnt->device->hostdata;
349 return zfcp_scsi_command_async(adapter, unit, scpnt, 0);
352 static struct zfcp_unit *
353 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, unsigned int id,
356 struct zfcp_port *port;
357 struct zfcp_unit *unit, *retval = NULL;
359 list_for_each_entry(port, &adapter->port_list_head, list) {
360 if (!port->rport || (id != port->rport->scsi_target_id))
362 list_for_each_entry(unit, &port->unit_list_head, list)
363 if (lun == unit->scsi_lun) {
373 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
374 * @scpnt: pointer to scsi_cmnd to be aborted
375 * Return: SUCCESS - command has been aborted and cleaned up in internal
376 * bookkeeping, SCSI stack won't be called for aborted command
379 * We do not need to care for a SCSI command which completes normally
380 * but late during this abort routine runs. We are allowed to return
381 * late commands to the SCSI stack. It tracks the state of commands and
382 * will handle late commands. (Usually, the normal completion of late
383 * commands is ignored with respect to the running abort operation.)
385 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
387 struct Scsi_Host *scsi_host;
388 struct zfcp_adapter *adapter;
389 struct zfcp_unit *unit;
390 struct zfcp_fsf_req *fsf_req;
392 unsigned long old_req_id;
393 int retval = SUCCESS;
395 scsi_host = scpnt->device->host;
396 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
397 unit = (struct zfcp_unit *) scpnt->device->hostdata;
399 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
400 scpnt, zfcp_get_busid_by_adapter(adapter));
402 /* avoid race condition between late normal completion and abort */
403 write_lock_irqsave(&adapter->abort_lock, flags);
405 /* Check whether corresponding fsf_req is still pending */
406 spin_lock(&adapter->req_list_lock);
407 fsf_req = zfcp_reqlist_find(adapter,
408 (unsigned long) scpnt->host_scribble);
409 spin_unlock(&adapter->req_list_lock);
411 write_unlock_irqrestore(&adapter->abort_lock, flags);
412 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, 0);
417 fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
418 old_req_id = fsf_req->req_id;
420 /* don't access old fsf_req after releasing the abort_lock */
421 write_unlock_irqrestore(&adapter->abort_lock, flags);
423 fsf_req = zfcp_fsf_abort_fcp_command(old_req_id, adapter, unit, 0);
425 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
426 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
432 __wait_event(fsf_req->completion_wq,
433 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
435 if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
436 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, fsf_req, 0);
438 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
439 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, fsf_req, 0);
442 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, fsf_req, 0);
445 zfcp_fsf_req_free(fsf_req);
451 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
454 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
457 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
461 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
462 unit->fcp_lun, unit->port->wwpn,
463 zfcp_get_busid_by_adapter(unit->port->adapter));
466 * If we do not know whether the unit supports 'logical unit reset'
467 * then try 'logical unit reset' and proceed with 'target reset'
468 * if 'logical unit reset' fails.
469 * If the unit is known not to support 'logical unit reset' then
470 * skip 'logical unit reset' and try 'target reset' immediately.
472 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
474 retval = zfcp_task_management_function(unit,
475 FCP_LOGICAL_UNIT_RESET,
478 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
479 if (retval == -ENOTSUPP)
481 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
483 /* fall through and try 'target reset' next */
485 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
487 /* avoid 'target reset' */
492 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
494 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
497 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
505 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
506 struct scsi_cmnd *scpnt)
508 struct zfcp_adapter *adapter = unit->port->adapter;
509 struct zfcp_fsf_req *fsf_req;
512 /* issue task management function */
513 fsf_req = zfcp_fsf_send_fcp_command_task_management
514 (adapter, unit, tm_flags, 0);
516 ZFCP_LOG_INFO("error: creation of task management request "
517 "failed for unit 0x%016Lx on port 0x%016Lx on "
518 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
519 zfcp_get_busid_by_adapter(adapter));
520 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
525 __wait_event(fsf_req->completion_wq,
526 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
529 * check completion status of task management function
531 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
532 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
534 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
535 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
538 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
540 zfcp_fsf_req_free(fsf_req);
546 * zfcp_scsi_eh_host_reset_handler - handler for host reset
548 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
550 struct zfcp_unit *unit;
551 struct zfcp_adapter *adapter;
553 unit = (struct zfcp_unit*) scpnt->device->hostdata;
554 adapter = unit->port->adapter;
556 ZFCP_LOG_NORMAL("host reset because of problems with "
557 "unit 0x%016Lx on port 0x%016Lx, adapter %s\n",
558 unit->fcp_lun, unit->port->wwpn,
559 zfcp_get_busid_by_adapter(unit->port->adapter));
561 zfcp_erp_adapter_reopen(adapter, 0);
562 zfcp_erp_wait(adapter);
568 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
571 static unsigned int unique_id = 0;
573 if (adapter->scsi_host)
576 /* register adapter as SCSI host with mid layer of SCSI stack */
577 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
578 sizeof (struct zfcp_adapter *));
579 if (!adapter->scsi_host) {
580 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
582 zfcp_get_busid_by_adapter(adapter));
586 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
588 /* tell the SCSI stack some characteristics of this adapter */
589 adapter->scsi_host->max_id = 1;
590 adapter->scsi_host->max_lun = 1;
591 adapter->scsi_host->max_channel = 0;
592 adapter->scsi_host->unique_id = unique_id++; /* FIXME */
593 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
594 adapter->scsi_host->transportt = zfcp_data.scsi_transport_template;
597 * save a pointer to our own adapter data structure within
598 * hostdata field of SCSI host data structure
600 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
602 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
603 scsi_host_put(adapter->scsi_host);
607 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
613 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
615 struct Scsi_Host *shost;
616 struct zfcp_port *port;
618 shost = adapter->scsi_host;
621 read_lock_irq(&zfcp_data.config_lock);
622 list_for_each_entry(port, &adapter->port_list_head, list)
625 read_unlock_irq(&zfcp_data.config_lock);
626 fc_remove_host(shost);
627 scsi_remove_host(shost);
628 scsi_host_put(shost);
629 adapter->scsi_host = NULL;
630 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
636 * Support functions for FC transport class
638 static struct fc_host_statistics*
639 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
641 struct fc_host_statistics *fc_stats;
643 if (!adapter->fc_stats) {
644 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
647 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
649 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
650 return adapter->fc_stats;
654 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
655 struct fsf_qtcb_bottom_port *data,
656 struct fsf_qtcb_bottom_port *old)
658 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
659 old->seconds_since_last_reset;
660 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
661 fc_stats->tx_words = data->tx_words - old->tx_words;
662 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
663 fc_stats->rx_words = data->rx_words - old->rx_words;
664 fc_stats->lip_count = data->lip - old->lip;
665 fc_stats->nos_count = data->nos - old->nos;
666 fc_stats->error_frames = data->error_frames - old->error_frames;
667 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
668 fc_stats->link_failure_count = data->link_failure - old->link_failure;
669 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
670 fc_stats->loss_of_signal_count = data->loss_of_signal -
672 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
673 old->psp_error_counts;
674 fc_stats->invalid_tx_word_count = data->invalid_tx_words -
675 old->invalid_tx_words;
676 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
677 fc_stats->fcp_input_requests = data->input_requests -
679 fc_stats->fcp_output_requests = data->output_requests -
680 old->output_requests;
681 fc_stats->fcp_control_requests = data->control_requests -
682 old->control_requests;
683 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
684 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
688 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
689 struct fsf_qtcb_bottom_port *data)
691 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
692 fc_stats->tx_frames = data->tx_frames;
693 fc_stats->tx_words = data->tx_words;
694 fc_stats->rx_frames = data->rx_frames;
695 fc_stats->rx_words = data->rx_words;
696 fc_stats->lip_count = data->lip;
697 fc_stats->nos_count = data->nos;
698 fc_stats->error_frames = data->error_frames;
699 fc_stats->dumped_frames = data->dumped_frames;
700 fc_stats->link_failure_count = data->link_failure;
701 fc_stats->loss_of_sync_count = data->loss_of_sync;
702 fc_stats->loss_of_signal_count = data->loss_of_signal;
703 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
704 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
705 fc_stats->invalid_crc_count = data->invalid_crcs;
706 fc_stats->fcp_input_requests = data->input_requests;
707 fc_stats->fcp_output_requests = data->output_requests;
708 fc_stats->fcp_control_requests = data->control_requests;
709 fc_stats->fcp_input_megabytes = data->input_mb;
710 fc_stats->fcp_output_megabytes = data->output_mb;
714 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
716 * assumption: scsi_transport_fc synchronizes calls of
717 * get_fc_host_stats and reset_fc_host_stats
718 * (XXX to be checked otherwise introduce locking)
720 static struct fc_host_statistics *
721 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
723 struct zfcp_adapter *adapter;
724 struct fc_host_statistics *fc_stats;
725 struct fsf_qtcb_bottom_port *data;
728 adapter = (struct zfcp_adapter *)shost->hostdata[0];
729 fc_stats = zfcp_init_fc_host_stats(adapter);
733 data = kzalloc(sizeof(*data), GFP_KERNEL);
737 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
740 return NULL; /* XXX return zeroed fc_stats? */
743 if (adapter->stats_reset &&
744 ((jiffies/HZ - adapter->stats_reset) <
745 data->seconds_since_last_reset)) {
746 zfcp_adjust_fc_host_stats(fc_stats, data,
747 adapter->stats_reset_data);
749 zfcp_set_fc_host_stats(fc_stats, data);
756 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
758 struct zfcp_adapter *adapter;
759 struct fsf_qtcb_bottom_port *data, *old_data;
762 adapter = (struct zfcp_adapter *)shost->hostdata[0];
763 data = kzalloc(sizeof(*data), GFP_KERNEL);
767 ret = zfcp_fsf_exchange_port_data_sync(adapter, data);
771 adapter->stats_reset = jiffies/HZ;
772 old_data = adapter->stats_reset_data;
773 adapter->stats_reset_data = data; /* finally freed in
779 static void zfcp_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
781 rport->dev_loss_tmo = timeout;
784 struct fc_function_template zfcp_transport_functions = {
785 .show_starget_port_id = 1,
786 .show_starget_port_name = 1,
787 .show_starget_node_name = 1,
788 .show_rport_supported_classes = 1,
789 .show_rport_maxframe_size = 1,
790 .show_rport_dev_loss_tmo = 1,
791 .show_host_node_name = 1,
792 .show_host_port_name = 1,
793 .show_host_permanent_port_name = 1,
794 .show_host_supported_classes = 1,
795 .show_host_supported_speeds = 1,
796 .show_host_maxframe_size = 1,
797 .show_host_serial_number = 1,
798 .get_fc_host_stats = zfcp_get_fc_host_stats,
799 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
800 .set_rport_dev_loss_tmo = zfcp_set_rport_dev_loss_tmo,
801 /* no functions registered for following dynamic attributes but
802 directly set by LLDD */
803 .show_host_port_type = 1,
804 .show_host_speed = 1,
805 .show_host_port_id = 1,
806 .disable_target_scan = 1,
810 * ZFCP_DEFINE_SCSI_ATTR
811 * @_name: name of show attribute
812 * @_format: format string
813 * @_value: value to print
815 * Generates attribute for a unit.
817 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
818 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \
821 struct scsi_device *sdev; \
822 struct zfcp_unit *unit; \
824 sdev = to_scsi_device(dev); \
825 unit = sdev->hostdata; \
826 return sprintf(buf, _format, _value); \
829 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
831 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
832 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
833 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
835 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {