3 * linux/drivers/s390/scsi/zfcp_scsi.c
5 * FCP adapter driver for IBM eServer zSeries
7 * (C) Copyright IBM Corp. 2002, 2004
9 * Author(s): Martin Peschke <mpeschke@de.ibm.com>
10 * Raimund Schroeder <raimund.schroeder@de.ibm.com>
13 * Stefan Bader <stefan.bader@de.ibm.com>
14 * Heiko Carstens <heiko.carstens@de.ibm.com>
15 * Andreas Herrmann <aherrman@de.ibm.com>
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License as published by
19 * the Free Software Foundation; either version 2, or (at your option)
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
32 #define ZFCP_LOG_AREA ZFCP_LOG_AREA_SCSI
36 static void zfcp_scsi_slave_destroy(struct scsi_device *sdp);
37 static int zfcp_scsi_slave_alloc(struct scsi_device *sdp);
38 static int zfcp_scsi_slave_configure(struct scsi_device *sdp);
39 static int zfcp_scsi_queuecommand(struct scsi_cmnd *,
40 void (*done) (struct scsi_cmnd *));
41 static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *);
42 static int zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *);
43 static int zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *);
44 static int zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *);
45 static int zfcp_task_management_function(struct zfcp_unit *, u8,
48 static struct zfcp_unit *zfcp_unit_lookup(struct zfcp_adapter *, int, scsi_id_t,
51 static struct device_attribute *zfcp_sysfs_sdev_attrs[];
53 struct scsi_transport_template *zfcp_transport_template;
55 struct zfcp_data zfcp_data = {
56 .scsi_host_template = {
61 slave_alloc: zfcp_scsi_slave_alloc,
62 slave_configure: zfcp_scsi_slave_configure,
63 slave_destroy: zfcp_scsi_slave_destroy,
64 queuecommand: zfcp_scsi_queuecommand,
65 eh_abort_handler: zfcp_scsi_eh_abort_handler,
66 eh_device_reset_handler: zfcp_scsi_eh_device_reset_handler,
67 eh_bus_reset_handler: zfcp_scsi_eh_bus_reset_handler,
68 eh_host_reset_handler: zfcp_scsi_eh_host_reset_handler,
69 /* FIXME(openfcp): Tune */
74 * one less? can zfcp_create_sbale cope with it?
76 sg_tablesize: ZFCP_MAX_SBALES_PER_REQ,
80 sdev_attrs: zfcp_sysfs_sdev_attrs,
82 .driver_version = ZFCP_VERSION,
83 /* rest initialised with zeros */
86 /* Find start of Response Information in FCP response unit*/
88 zfcp_get_fcp_rsp_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
90 char *fcp_rsp_info_ptr;
93 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
95 return fcp_rsp_info_ptr;
98 /* Find start of Sense Information in FCP response unit*/
100 zfcp_get_fcp_sns_info_ptr(struct fcp_rsp_iu *fcp_rsp_iu)
102 char *fcp_sns_info_ptr;
105 (unsigned char *) fcp_rsp_iu + (sizeof (struct fcp_rsp_iu));
106 if (fcp_rsp_iu->validity.bits.fcp_rsp_len_valid)
107 fcp_sns_info_ptr = (char *) fcp_sns_info_ptr +
108 fcp_rsp_iu->fcp_rsp_len;
110 return fcp_sns_info_ptr;
114 zfcp_get_fcp_dl_ptr(struct fcp_cmnd_iu * fcp_cmd)
116 int additional_length = fcp_cmd->add_fcp_cdb_length << 2;
117 fcp_dl_t *fcp_dl_addr;
119 fcp_dl_addr = (fcp_dl_t *)
120 ((unsigned char *) fcp_cmd +
121 sizeof (struct fcp_cmnd_iu) + additional_length);
123 * fcp_dl_addr = start address of fcp_cmnd structure +
124 * size of fixed part + size of dynamically sized add_dcp_cdb field
125 * SEE FCP-2 documentation
131 zfcp_get_fcp_dl(struct fcp_cmnd_iu * fcp_cmd)
133 return *zfcp_get_fcp_dl_ptr(fcp_cmd);
137 zfcp_set_fcp_dl(struct fcp_cmnd_iu *fcp_cmd, fcp_dl_t fcp_dl)
139 *zfcp_get_fcp_dl_ptr(fcp_cmd) = fcp_dl;
143 * note: it's a bit-or operation not an assignment
144 * regarding the specified byte
147 set_byte(u32 * result, char status, char pos)
149 *result |= status << (pos * 8);
153 set_host_byte(u32 * result, char status)
155 set_byte(result, status, 2);
159 set_driver_byte(u32 * result, char status)
161 set_byte(result, status, 3);
165 * function: zfcp_scsi_slave_alloc
173 zfcp_scsi_slave_alloc(struct scsi_device *sdp)
175 struct zfcp_adapter *adapter;
176 struct zfcp_unit *unit;
180 adapter = (struct zfcp_adapter *) sdp->host->hostdata[0];
184 read_lock_irqsave(&zfcp_data.config_lock, flags);
185 unit = zfcp_unit_lookup(adapter, sdp->channel, sdp->id, sdp->lun);
187 sdp->hostdata = unit;
192 read_unlock_irqrestore(&zfcp_data.config_lock, flags);
198 * function: zfcp_scsi_slave_destroy
206 zfcp_scsi_slave_destroy(struct scsi_device *sdpnt)
208 struct zfcp_unit *unit = (struct zfcp_unit *) sdpnt->hostdata;
211 sdpnt->hostdata = NULL;
215 ZFCP_LOG_NORMAL("bug: no unit associated with SCSI device at "
216 "address %p\n", sdpnt);
221 * called from scsi midlayer to allow finetuning of a device.
224 zfcp_scsi_slave_configure(struct scsi_device *sdp)
226 if (sdp->tagged_supported)
227 scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, ZFCP_CMND_PER_LUN);
229 scsi_adjust_queue_depth(sdp, 0, 1);
234 * zfcp_scsi_command_fail - set result in scsi_cmnd and call scsi_done function
235 * @scpnt: pointer to struct scsi_cmnd where result is set
236 * @result: result to be set in scpnt (e.g. DID_ERROR)
239 zfcp_scsi_command_fail(struct scsi_cmnd *scpnt, int result)
241 set_host_byte(&scpnt->result, result);
242 if ((scpnt->device != NULL) && (scpnt->device->host != NULL))
243 zfcp_scsi_dbf_event_result("fail", 4,
244 (struct zfcp_adapter*) scpnt->device->host->hostdata[0],
246 /* return directly */
247 scpnt->scsi_done(scpnt);
251 * zfcp_scsi_command_async - worker for zfcp_scsi_queuecommand and
252 * zfcp_scsi_command_sync
253 * @adapter: adapter where scsi command is issued
254 * @unit: unit to which scsi command is sent
255 * @scpnt: scsi command to be sent
256 * @timer: timer to be started if request is successfully initiated
258 * Note: In scsi_done function must be set in scpnt.
261 zfcp_scsi_command_async(struct zfcp_adapter *adapter, struct zfcp_unit *unit,
262 struct scsi_cmnd *scpnt, struct timer_list *timer)
269 BUG_ON((adapter == NULL) || (adapter != unit->port->adapter));
270 BUG_ON(scpnt->scsi_done == NULL);
272 if (unlikely(NULL == unit)) {
273 zfcp_scsi_command_fail(scpnt, DID_NO_CONNECT);
278 atomic_test_mask(ZFCP_STATUS_COMMON_ERP_FAILED, &unit->status) ||
279 !atomic_test_mask(ZFCP_STATUS_COMMON_RUNNING, &unit->status))) {
280 ZFCP_LOG_DEBUG("stopping SCSI I/O on unit 0x%016Lx on port "
281 "0x%016Lx on adapter %s\n",
282 unit->fcp_lun, unit->port->wwpn,
283 zfcp_get_busid_by_adapter(adapter));
284 zfcp_scsi_command_fail(scpnt, DID_ERROR);
289 !atomic_test_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))) {
290 ZFCP_LOG_DEBUG("adapter %s not ready or unit 0x%016Lx "
291 "on port 0x%016Lx in recovery\n",
292 zfcp_get_busid_by_unit(unit),
293 unit->fcp_lun, unit->port->wwpn);
294 retval = SCSI_MLQUEUE_DEVICE_BUSY;
298 tmp = zfcp_fsf_send_fcp_command_task(adapter, unit, scpnt, timer,
299 ZFCP_REQ_AUTO_CLEANUP);
301 if (unlikely(tmp < 0)) {
302 ZFCP_LOG_DEBUG("error: initiation of Send FCP Cmnd failed\n");
303 retval = SCSI_MLQUEUE_HOST_BUSY;
311 zfcp_scsi_command_sync_handler(struct scsi_cmnd *scpnt)
313 struct completion *wait = (struct completion *) scpnt->SCp.ptr;
319 * zfcp_scsi_command_sync - send a SCSI command and wait for completion
320 * @unit: unit where command is sent to
321 * @scpnt: scsi command to be sent
322 * @timer: timer to be started if request is successfully initiated
325 * Errors are indicated in scpnt->result
328 zfcp_scsi_command_sync(struct zfcp_unit *unit, struct scsi_cmnd *scpnt,
329 struct timer_list *timer)
332 DECLARE_COMPLETION(wait);
334 scpnt->SCp.ptr = (void *) &wait; /* silent re-use */
335 scpnt->scsi_done = zfcp_scsi_command_sync_handler;
336 ret = zfcp_scsi_command_async(unit->port->adapter, unit, scpnt, timer);
338 wait_for_completion(&wait);
340 scpnt->SCp.ptr = NULL;
346 * function: zfcp_scsi_queuecommand
348 * purpose: enqueues a SCSI command to the specified target device
350 * returns: 0 - success, SCSI command enqueued
354 zfcp_scsi_queuecommand(struct scsi_cmnd *scpnt,
355 void (*done) (struct scsi_cmnd *))
357 struct zfcp_unit *unit;
358 struct zfcp_adapter *adapter;
360 /* reset the status for this request */
362 scpnt->host_scribble = NULL;
363 scpnt->scsi_done = done;
366 * figure out adapter and target device
367 * (stored there by zfcp_scsi_slave_alloc)
369 adapter = (struct zfcp_adapter *) scpnt->device->host->hostdata[0];
370 unit = (struct zfcp_unit *) scpnt->device->hostdata;
372 return zfcp_scsi_command_async(adapter, unit, scpnt, NULL);
376 * function: zfcp_unit_lookup
384 static struct zfcp_unit *
385 zfcp_unit_lookup(struct zfcp_adapter *adapter, int channel, scsi_id_t id,
388 struct zfcp_port *port;
389 struct zfcp_unit *unit, *retval = NULL;
391 list_for_each_entry(port, &adapter->port_list_head, list) {
392 if (!port->rport || (id != port->rport->scsi_target_id))
394 list_for_each_entry(unit, &port->unit_list_head, list) {
395 if (lun == unit->scsi_lun) {
406 * zfcp_scsi_eh_abort_handler - abort the specified SCSI command
407 * @scpnt: pointer to scsi_cmnd to be aborted
408 * Return: SUCCESS - command has been aborted and cleaned up in internal
409 * bookkeeping, SCSI stack won't be called for aborted command
412 * We do not need to care for a SCSI command which completes normally
413 * but late during this abort routine runs. We are allowed to return
414 * late commands to the SCSI stack. It tracks the state of commands and
415 * will handle late commands. (Usually, the normal completion of late
416 * commands is ignored with respect to the running abort operation.)
419 zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
421 struct Scsi_Host *scsi_host;
422 struct zfcp_adapter *adapter;
423 struct zfcp_unit *unit;
424 int retval = SUCCESS;
425 struct zfcp_fsf_req *new_fsf_req = NULL;
426 struct zfcp_fsf_req *old_fsf_req;
429 scsi_host = scpnt->device->host;
430 adapter = (struct zfcp_adapter *) scsi_host->hostdata[0];
431 unit = (struct zfcp_unit *) scpnt->device->hostdata;
433 ZFCP_LOG_INFO("aborting scsi_cmnd=%p on adapter %s\n",
434 scpnt, zfcp_get_busid_by_adapter(adapter));
436 /* avoid race condition between late normal completion and abort */
437 write_lock_irqsave(&adapter->abort_lock, flags);
440 * Check whether command has just completed and can not be aborted.
441 * Even if the command has just been completed late, we can access
442 * scpnt since the SCSI stack does not release it at least until
443 * this routine returns. (scpnt is parameter passed to this routine
444 * and must not disappear during abort even on late completion.)
446 old_fsf_req = (struct zfcp_fsf_req *) scpnt->host_scribble;
448 write_unlock_irqrestore(&adapter->abort_lock, flags);
449 zfcp_scsi_dbf_event_abort("lte1", adapter, scpnt, NULL, NULL);
453 old_fsf_req->data = 0;
454 old_fsf_req->status |= ZFCP_STATUS_FSFREQ_ABORTING;
456 /* don't access old_fsf_req after releasing the abort_lock */
457 write_unlock_irqrestore(&adapter->abort_lock, flags);
458 /* call FSF routine which does the abort */
459 new_fsf_req = zfcp_fsf_abort_fcp_command((unsigned long) old_fsf_req,
462 ZFCP_LOG_INFO("error: initiation of Abort FCP Cmnd failed\n");
463 zfcp_scsi_dbf_event_abort("nres", adapter, scpnt, NULL,
469 /* wait for completion of abort */
470 __wait_event(new_fsf_req->completion_wq,
471 new_fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
473 /* status should be valid since signals were not permitted */
474 if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED) {
475 zfcp_scsi_dbf_event_abort("okay", adapter, scpnt, new_fsf_req,
478 } else if (new_fsf_req->status & ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED) {
479 zfcp_scsi_dbf_event_abort("lte2", adapter, scpnt, new_fsf_req,
483 zfcp_scsi_dbf_event_abort("fail", adapter, scpnt, new_fsf_req,
487 zfcp_fsf_req_free(new_fsf_req);
493 * function: zfcp_scsi_eh_device_reset_handler
500 zfcp_scsi_eh_device_reset_handler(struct scsi_cmnd *scpnt)
503 struct zfcp_unit *unit = (struct zfcp_unit *) scpnt->device->hostdata;
506 ZFCP_LOG_NORMAL("bug: Tried reset for nonexistent unit\n");
510 ZFCP_LOG_NORMAL("resetting unit 0x%016Lx\n", unit->fcp_lun);
513 * If we do not know whether the unit supports 'logical unit reset'
514 * then try 'logical unit reset' and proceed with 'target reset'
515 * if 'logical unit reset' fails.
516 * If the unit is known not to support 'logical unit reset' then
517 * skip 'logical unit reset' and try 'target reset' immediately.
519 if (!atomic_test_mask(ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
521 retval = zfcp_task_management_function(unit,
522 FCP_LOGICAL_UNIT_RESET,
525 ZFCP_LOG_DEBUG("unit reset failed (unit=%p)\n", unit);
526 if (retval == -ENOTSUPP)
528 (ZFCP_STATUS_UNIT_NOTSUPPUNITRESET,
530 /* fall through and try 'target reset' next */
532 ZFCP_LOG_DEBUG("unit reset succeeded (unit=%p)\n",
534 /* avoid 'target reset' */
539 retval = zfcp_task_management_function(unit, FCP_TARGET_RESET, scpnt);
541 ZFCP_LOG_DEBUG("target reset failed (unit=%p)\n", unit);
544 ZFCP_LOG_DEBUG("target reset succeeded (unit=%p)\n", unit);
552 zfcp_task_management_function(struct zfcp_unit *unit, u8 tm_flags,
553 struct scsi_cmnd *scpnt)
555 struct zfcp_adapter *adapter = unit->port->adapter;
556 struct zfcp_fsf_req *fsf_req;
559 /* issue task management function */
560 fsf_req = zfcp_fsf_send_fcp_command_task_management
561 (adapter, unit, tm_flags, 0);
563 ZFCP_LOG_INFO("error: creation of task management request "
564 "failed for unit 0x%016Lx on port 0x%016Lx on "
565 "adapter %s\n", unit->fcp_lun, unit->port->wwpn,
566 zfcp_get_busid_by_adapter(adapter));
567 zfcp_scsi_dbf_event_devreset("nres", tm_flags, unit, scpnt);
572 __wait_event(fsf_req->completion_wq,
573 fsf_req->status & ZFCP_STATUS_FSFREQ_COMPLETED);
576 * check completion status of task management function
578 if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCFAILED) {
579 zfcp_scsi_dbf_event_devreset("fail", tm_flags, unit, scpnt);
581 } else if (fsf_req->status & ZFCP_STATUS_FSFREQ_TMFUNCNOTSUPP) {
582 zfcp_scsi_dbf_event_devreset("nsup", tm_flags, unit, scpnt);
585 zfcp_scsi_dbf_event_devreset("okay", tm_flags, unit, scpnt);
587 zfcp_fsf_req_free(fsf_req);
593 * zfcp_scsi_eh_bus_reset_handler - reset bus (reopen adapter)
596 zfcp_scsi_eh_bus_reset_handler(struct scsi_cmnd *scpnt)
598 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
599 struct zfcp_adapter *adapter = unit->port->adapter;
601 ZFCP_LOG_NORMAL("bus reset because of problems with "
602 "unit 0x%016Lx\n", unit->fcp_lun);
603 zfcp_erp_adapter_reopen(adapter, 0);
604 zfcp_erp_wait(adapter);
610 * zfcp_scsi_eh_host_reset_handler - reset host (reopen adapter)
613 zfcp_scsi_eh_host_reset_handler(struct scsi_cmnd *scpnt)
615 struct zfcp_unit *unit = (struct zfcp_unit*) scpnt->device->hostdata;
616 struct zfcp_adapter *adapter = unit->port->adapter;
618 ZFCP_LOG_NORMAL("host reset because of problems with "
619 "unit 0x%016Lx\n", unit->fcp_lun);
620 zfcp_erp_adapter_reopen(adapter, 0);
621 zfcp_erp_wait(adapter);
634 zfcp_adapter_scsi_register(struct zfcp_adapter *adapter)
637 static unsigned int unique_id = 0;
639 /* register adapter as SCSI host with mid layer of SCSI stack */
640 adapter->scsi_host = scsi_host_alloc(&zfcp_data.scsi_host_template,
641 sizeof (struct zfcp_adapter *));
642 if (!adapter->scsi_host) {
643 ZFCP_LOG_NORMAL("error: registration with SCSI stack failed "
645 zfcp_get_busid_by_adapter(adapter));
649 ZFCP_LOG_DEBUG("host registered, scsi_host=%p\n", adapter->scsi_host);
651 /* tell the SCSI stack some characteristics of this adapter */
652 adapter->scsi_host->max_id = 1;
653 adapter->scsi_host->max_lun = 1;
654 adapter->scsi_host->max_channel = 0;
655 adapter->scsi_host->unique_id = unique_id++; /* FIXME */
656 adapter->scsi_host->max_cmd_len = ZFCP_MAX_SCSI_CMND_LENGTH;
657 adapter->scsi_host->transportt = zfcp_transport_template;
659 * Reverse mapping of the host number to avoid race condition
661 adapter->scsi_host_no = adapter->scsi_host->host_no;
664 * save a pointer to our own adapter data structure within
665 * hostdata field of SCSI host data structure
667 adapter->scsi_host->hostdata[0] = (unsigned long) adapter;
669 if (scsi_add_host(adapter->scsi_host, &adapter->ccw_device->dev)) {
670 scsi_host_put(adapter->scsi_host);
674 atomic_set_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
687 zfcp_adapter_scsi_unregister(struct zfcp_adapter *adapter)
689 struct Scsi_Host *shost;
690 struct zfcp_port *port;
692 shost = adapter->scsi_host;
695 read_lock_irq(&zfcp_data.config_lock);
696 list_for_each_entry(port, &adapter->port_list_head, list)
699 read_unlock_irq(&zfcp_data.config_lock);
700 fc_remove_host(shost);
701 scsi_remove_host(shost);
702 scsi_host_put(shost);
703 adapter->scsi_host = NULL;
704 adapter->scsi_host_no = 0;
705 atomic_clear_mask(ZFCP_STATUS_ADAPTER_REGISTERED, &adapter->status);
712 zfcp_fsf_start_scsi_er_timer(struct zfcp_adapter *adapter)
714 adapter->scsi_er_timer.function = zfcp_fsf_scsi_er_timeout_handler;
715 adapter->scsi_er_timer.data = (unsigned long) adapter;
716 adapter->scsi_er_timer.expires = jiffies + ZFCP_SCSI_ER_TIMEOUT;
717 add_timer(&adapter->scsi_er_timer);
721 * Support functions for FC transport class
723 static struct fc_host_statistics*
724 zfcp_init_fc_host_stats(struct zfcp_adapter *adapter)
726 struct fc_host_statistics *fc_stats;
728 if (!adapter->fc_stats) {
729 fc_stats = kmalloc(sizeof(*fc_stats), GFP_KERNEL);
732 adapter->fc_stats = fc_stats; /* freed in adater_dequeue */
734 memset(adapter->fc_stats, 0, sizeof(*adapter->fc_stats));
735 return adapter->fc_stats;
739 zfcp_adjust_fc_host_stats(struct fc_host_statistics *fc_stats,
740 struct fsf_qtcb_bottom_port *data,
741 struct fsf_qtcb_bottom_port *old)
743 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset -
744 old->seconds_since_last_reset;
745 fc_stats->tx_frames = data->tx_frames - old->tx_frames;
746 fc_stats->tx_words = data->tx_words - old->tx_words;
747 fc_stats->rx_frames = data->rx_frames - old->rx_frames;
748 fc_stats->rx_words = data->rx_words - old->rx_words;
749 fc_stats->lip_count = data->lip - old->lip;
750 fc_stats->nos_count = data->nos - old->nos;
751 fc_stats->error_frames = data->error_frames - old->error_frames;
752 fc_stats->dumped_frames = data->dumped_frames - old->dumped_frames;
753 fc_stats->link_failure_count = data->link_failure - old->link_failure;
754 fc_stats->loss_of_sync_count = data->loss_of_sync - old->loss_of_sync;
755 fc_stats->loss_of_signal_count = data->loss_of_signal -
757 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts -
758 old->psp_error_counts;
759 fc_stats->invalid_tx_word_count = data->invalid_tx_words -
760 old->invalid_tx_words;
761 fc_stats->invalid_crc_count = data->invalid_crcs - old->invalid_crcs;
762 fc_stats->fcp_input_requests = data->input_requests -
764 fc_stats->fcp_output_requests = data->output_requests -
765 old->output_requests;
766 fc_stats->fcp_control_requests = data->control_requests -
767 old->control_requests;
768 fc_stats->fcp_input_megabytes = data->input_mb - old->input_mb;
769 fc_stats->fcp_output_megabytes = data->output_mb - old->output_mb;
773 zfcp_set_fc_host_stats(struct fc_host_statistics *fc_stats,
774 struct fsf_qtcb_bottom_port *data)
776 fc_stats->seconds_since_last_reset = data->seconds_since_last_reset;
777 fc_stats->tx_frames = data->tx_frames;
778 fc_stats->tx_words = data->tx_words;
779 fc_stats->rx_frames = data->rx_frames;
780 fc_stats->rx_words = data->rx_words;
781 fc_stats->lip_count = data->lip;
782 fc_stats->nos_count = data->nos;
783 fc_stats->error_frames = data->error_frames;
784 fc_stats->dumped_frames = data->dumped_frames;
785 fc_stats->link_failure_count = data->link_failure;
786 fc_stats->loss_of_sync_count = data->loss_of_sync;
787 fc_stats->loss_of_signal_count = data->loss_of_signal;
788 fc_stats->prim_seq_protocol_err_count = data->psp_error_counts;
789 fc_stats->invalid_tx_word_count = data->invalid_tx_words;
790 fc_stats->invalid_crc_count = data->invalid_crcs;
791 fc_stats->fcp_input_requests = data->input_requests;
792 fc_stats->fcp_output_requests = data->output_requests;
793 fc_stats->fcp_control_requests = data->control_requests;
794 fc_stats->fcp_input_megabytes = data->input_mb;
795 fc_stats->fcp_output_megabytes = data->output_mb;
799 * zfcp_get_fc_host_stats - provide fc_host_statistics for scsi_transport_fc
801 * assumption: scsi_transport_fc synchronizes calls of
802 * get_fc_host_stats and reset_fc_host_stats
803 * (XXX to be checked otherwise introduce locking)
805 static struct fc_host_statistics *
806 zfcp_get_fc_host_stats(struct Scsi_Host *shost)
808 struct zfcp_adapter *adapter;
809 struct fc_host_statistics *fc_stats;
810 struct fsf_qtcb_bottom_port *data;
813 adapter = (struct zfcp_adapter *)shost->hostdata[0];
814 fc_stats = zfcp_init_fc_host_stats(adapter);
818 data = kmalloc(sizeof(*data), GFP_KERNEL);
821 memset(data, 0, sizeof(*data));
823 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
826 return NULL; /* XXX return zeroed fc_stats? */
829 if (adapter->stats_reset &&
830 ((jiffies/HZ - adapter->stats_reset) <
831 data->seconds_since_last_reset)) {
832 zfcp_adjust_fc_host_stats(fc_stats, data,
833 adapter->stats_reset_data);
835 zfcp_set_fc_host_stats(fc_stats, data);
842 zfcp_reset_fc_host_stats(struct Scsi_Host *shost)
844 struct zfcp_adapter *adapter;
845 struct fsf_qtcb_bottom_port *data, *old_data;
848 adapter = (struct zfcp_adapter *)shost->hostdata[0];
849 data = kmalloc(sizeof(*data), GFP_KERNEL);
852 memset(data, 0, sizeof(*data));
854 ret = zfcp_fsf_exchange_port_data(NULL, adapter, data);
856 adapter->stats_reset = jiffies/HZ;
857 old_data = adapter->stats_reset_data;
858 adapter->stats_reset_data = data; /* finally freed in
864 struct fc_function_template zfcp_transport_functions = {
865 .show_starget_port_id = 1,
866 .show_starget_port_name = 1,
867 .show_starget_node_name = 1,
868 .show_rport_supported_classes = 1,
869 .show_host_node_name = 1,
870 .show_host_port_name = 1,
871 .show_host_permanent_port_name = 1,
872 .show_host_supported_classes = 1,
873 .show_host_supported_speeds = 1,
874 .show_host_maxframe_size = 1,
875 .show_host_serial_number = 1,
876 .get_fc_host_stats = zfcp_get_fc_host_stats,
877 .reset_fc_host_stats = zfcp_reset_fc_host_stats,
878 /* no functions registered for following dynamic attributes but
879 directly set by LLDD */
880 .show_host_port_type = 1,
881 .show_host_speed = 1,
882 .show_host_port_id = 1,
886 * ZFCP_DEFINE_SCSI_ATTR
887 * @_name: name of show attribute
888 * @_format: format string
889 * @_value: value to print
891 * Generates attribute for a unit.
893 #define ZFCP_DEFINE_SCSI_ATTR(_name, _format, _value) \
894 static ssize_t zfcp_sysfs_scsi_##_name##_show(struct device *dev, struct device_attribute *attr, \
897 struct scsi_device *sdev; \
898 struct zfcp_unit *unit; \
900 sdev = to_scsi_device(dev); \
901 unit = sdev->hostdata; \
902 return sprintf(buf, _format, _value); \
905 static DEVICE_ATTR(_name, S_IRUGO, zfcp_sysfs_scsi_##_name##_show, NULL);
907 ZFCP_DEFINE_SCSI_ATTR(hba_id, "%s\n", zfcp_get_busid_by_unit(unit));
908 ZFCP_DEFINE_SCSI_ATTR(wwpn, "0x%016llx\n", unit->port->wwpn);
909 ZFCP_DEFINE_SCSI_ATTR(fcp_lun, "0x%016llx\n", unit->fcp_lun);
911 static struct device_attribute *zfcp_sysfs_sdev_attrs[] = {