2 * SCSI RDMA (SRP) transport class
4 * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2 of the
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/jiffies.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
28 #include <scsi/scsi.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_transport.h>
33 #include <scsi/scsi_transport_srp.h>
34 #include "scsi_priv.h"
36 struct srp_host_attrs
{
37 atomic_t next_port_id
;
39 #define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)
41 #define SRP_HOST_ATTRS 0
42 #define SRP_RPORT_ATTRS 8
45 struct scsi_transport_template t
;
46 struct srp_function_template
*f
;
48 struct device_attribute
*host_attrs
[SRP_HOST_ATTRS
+ 1];
50 struct device_attribute
*rport_attrs
[SRP_RPORT_ATTRS
+ 1];
51 struct transport_container rport_attr_cont
;
54 #define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)
56 #define dev_to_rport(d) container_of(d, struct srp_rport, dev)
57 #define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)
58 static inline struct Scsi_Host
*rport_to_shost(struct srp_rport
*r
)
60 return dev_to_shost(r
->dev
.parent
);
63 static inline struct srp_rport
*shost_to_rport(struct Scsi_Host
*shost
)
65 return transport_class_to_srp_rport(&shost
->shost_gendev
);
69 * srp_tmo_valid() - check timeout combination validity
70 * @reconnect_delay: Reconnect delay in seconds.
71 * @fast_io_fail_tmo: Fast I/O fail timeout in seconds.
72 * @dev_loss_tmo: Device loss timeout in seconds.
74 * The combination of the timeout parameters must be such that SCSI commands
75 * are finished in a reasonable time. Hence do not allow the fast I/O fail
76 * timeout to exceed SCSI_DEVICE_BLOCK_MAX_TIMEOUT nor allow dev_loss_tmo to
77 * exceed that limit if failing I/O fast has been disabled. Furthermore, these
78 * parameters must be such that multipath can detect failed paths timely.
79 * Hence do not allow all three parameters to be disabled simultaneously.
81 int srp_tmo_valid(int reconnect_delay
, int fast_io_fail_tmo
, int dev_loss_tmo
)
83 if (reconnect_delay
< 0 && fast_io_fail_tmo
< 0 && dev_loss_tmo
< 0)
85 if (reconnect_delay
== 0)
87 if (fast_io_fail_tmo
> SCSI_DEVICE_BLOCK_MAX_TIMEOUT
)
89 if (fast_io_fail_tmo
< 0 &&
90 dev_loss_tmo
> SCSI_DEVICE_BLOCK_MAX_TIMEOUT
)
92 if (dev_loss_tmo
>= LONG_MAX
/ HZ
)
94 if (fast_io_fail_tmo
>= 0 && dev_loss_tmo
>= 0 &&
95 fast_io_fail_tmo
>= dev_loss_tmo
)
99 EXPORT_SYMBOL_GPL(srp_tmo_valid
);
101 static int srp_host_setup(struct transport_container
*tc
, struct device
*dev
,
104 struct Scsi_Host
*shost
= dev_to_shost(dev
);
105 struct srp_host_attrs
*srp_host
= to_srp_host_attrs(shost
);
107 atomic_set(&srp_host
->next_port_id
, 0);
111 static DECLARE_TRANSPORT_CLASS(srp_host_class
, "srp_host", srp_host_setup
,
114 static DECLARE_TRANSPORT_CLASS(srp_rport_class
, "srp_remote_ports",
118 show_srp_rport_id(struct device
*dev
, struct device_attribute
*attr
,
121 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
122 return sprintf(buf
, "%16phC\n", rport
->port_id
);
125 static DEVICE_ATTR(port_id
, S_IRUGO
, show_srp_rport_id
, NULL
);
127 static const struct {
130 } srp_rport_role_names
[] = {
131 {SRP_RPORT_ROLE_INITIATOR
, "SRP Initiator"},
132 {SRP_RPORT_ROLE_TARGET
, "SRP Target"},
136 show_srp_rport_roles(struct device
*dev
, struct device_attribute
*attr
,
139 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
143 for (i
= 0; i
< ARRAY_SIZE(srp_rport_role_names
); i
++)
144 if (srp_rport_role_names
[i
].value
== rport
->roles
) {
145 name
= srp_rport_role_names
[i
].name
;
148 return sprintf(buf
, "%s\n", name
? : "unknown");
151 static DEVICE_ATTR(roles
, S_IRUGO
, show_srp_rport_roles
, NULL
);
153 static ssize_t
store_srp_rport_delete(struct device
*dev
,
154 struct device_attribute
*attr
,
155 const char *buf
, size_t count
)
157 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
158 struct Scsi_Host
*shost
= dev_to_shost(dev
);
159 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
161 if (i
->f
->rport_delete
) {
162 i
->f
->rport_delete(rport
);
169 static DEVICE_ATTR(delete, S_IWUSR
, NULL
, store_srp_rport_delete
);
171 static ssize_t
show_srp_rport_state(struct device
*dev
,
172 struct device_attribute
*attr
,
175 static const char *const state_name
[] = {
176 [SRP_RPORT_RUNNING
] = "running",
177 [SRP_RPORT_BLOCKED
] = "blocked",
178 [SRP_RPORT_FAIL_FAST
] = "fail-fast",
179 [SRP_RPORT_LOST
] = "lost",
181 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
182 enum srp_rport_state state
= rport
->state
;
184 return sprintf(buf
, "%s\n",
185 (unsigned)state
< ARRAY_SIZE(state_name
) ?
186 state_name
[state
] : "???");
189 static DEVICE_ATTR(state
, S_IRUGO
, show_srp_rport_state
, NULL
);
191 static ssize_t
srp_show_tmo(char *buf
, int tmo
)
193 return tmo
>= 0 ? sprintf(buf
, "%d\n", tmo
) : sprintf(buf
, "off\n");
196 int srp_parse_tmo(int *tmo
, const char *buf
)
200 if (strncmp(buf
, "off", 3) != 0)
201 res
= kstrtoint(buf
, 0, tmo
);
207 EXPORT_SYMBOL(srp_parse_tmo
);
209 static ssize_t
show_reconnect_delay(struct device
*dev
,
210 struct device_attribute
*attr
, char *buf
)
212 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
214 return srp_show_tmo(buf
, rport
->reconnect_delay
);
217 static ssize_t
store_reconnect_delay(struct device
*dev
,
218 struct device_attribute
*attr
,
219 const char *buf
, const size_t count
)
221 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
224 res
= srp_parse_tmo(&delay
, buf
);
227 res
= srp_tmo_valid(delay
, rport
->fast_io_fail_tmo
,
228 rport
->dev_loss_tmo
);
232 if (rport
->reconnect_delay
<= 0 && delay
> 0 &&
233 rport
->state
!= SRP_RPORT_RUNNING
) {
234 queue_delayed_work(system_long_wq
, &rport
->reconnect_work
,
236 } else if (delay
<= 0) {
237 cancel_delayed_work(&rport
->reconnect_work
);
239 rport
->reconnect_delay
= delay
;
246 static DEVICE_ATTR(reconnect_delay
, S_IRUGO
| S_IWUSR
, show_reconnect_delay
,
247 store_reconnect_delay
);
249 static ssize_t
show_failed_reconnects(struct device
*dev
,
250 struct device_attribute
*attr
, char *buf
)
252 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
254 return sprintf(buf
, "%d\n", rport
->failed_reconnects
);
257 static DEVICE_ATTR(failed_reconnects
, S_IRUGO
, show_failed_reconnects
, NULL
);
259 static ssize_t
show_srp_rport_fast_io_fail_tmo(struct device
*dev
,
260 struct device_attribute
*attr
,
263 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
265 return srp_show_tmo(buf
, rport
->fast_io_fail_tmo
);
268 static ssize_t
store_srp_rport_fast_io_fail_tmo(struct device
*dev
,
269 struct device_attribute
*attr
,
270 const char *buf
, size_t count
)
272 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
274 int fast_io_fail_tmo
;
276 res
= srp_parse_tmo(&fast_io_fail_tmo
, buf
);
279 res
= srp_tmo_valid(rport
->reconnect_delay
, fast_io_fail_tmo
,
280 rport
->dev_loss_tmo
);
283 rport
->fast_io_fail_tmo
= fast_io_fail_tmo
;
290 static DEVICE_ATTR(fast_io_fail_tmo
, S_IRUGO
| S_IWUSR
,
291 show_srp_rport_fast_io_fail_tmo
,
292 store_srp_rport_fast_io_fail_tmo
);
294 static ssize_t
show_srp_rport_dev_loss_tmo(struct device
*dev
,
295 struct device_attribute
*attr
,
298 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
300 return srp_show_tmo(buf
, rport
->dev_loss_tmo
);
303 static ssize_t
store_srp_rport_dev_loss_tmo(struct device
*dev
,
304 struct device_attribute
*attr
,
305 const char *buf
, size_t count
)
307 struct srp_rport
*rport
= transport_class_to_srp_rport(dev
);
311 res
= srp_parse_tmo(&dev_loss_tmo
, buf
);
314 res
= srp_tmo_valid(rport
->reconnect_delay
, rport
->fast_io_fail_tmo
,
318 rport
->dev_loss_tmo
= dev_loss_tmo
;
325 static DEVICE_ATTR(dev_loss_tmo
, S_IRUGO
| S_IWUSR
,
326 show_srp_rport_dev_loss_tmo
,
327 store_srp_rport_dev_loss_tmo
);
329 static int srp_rport_set_state(struct srp_rport
*rport
,
330 enum srp_rport_state new_state
)
332 enum srp_rport_state old_state
= rport
->state
;
334 lockdep_assert_held(&rport
->mutex
);
337 case SRP_RPORT_RUNNING
:
345 case SRP_RPORT_BLOCKED
:
347 case SRP_RPORT_RUNNING
:
353 case SRP_RPORT_FAIL_FAST
:
364 rport
->state
= new_state
;
372 * srp_reconnect_work() - reconnect and schedule a new attempt if necessary
373 * @work: Work structure used for scheduling this operation.
375 static void srp_reconnect_work(struct work_struct
*work
)
377 struct srp_rport
*rport
= container_of(to_delayed_work(work
),
378 struct srp_rport
, reconnect_work
);
379 struct Scsi_Host
*shost
= rport_to_shost(rport
);
382 res
= srp_reconnect_rport(rport
);
384 shost_printk(KERN_ERR
, shost
,
385 "reconnect attempt %d failed (%d)\n",
386 ++rport
->failed_reconnects
, res
);
387 delay
= rport
->reconnect_delay
*
388 min(100, max(1, rport
->failed_reconnects
- 10));
390 queue_delayed_work(system_long_wq
,
391 &rport
->reconnect_work
, delay
* HZ
);
395 static void __rport_fail_io_fast(struct srp_rport
*rport
)
397 struct Scsi_Host
*shost
= rport_to_shost(rport
);
398 struct srp_internal
*i
;
400 lockdep_assert_held(&rport
->mutex
);
402 if (srp_rport_set_state(rport
, SRP_RPORT_FAIL_FAST
))
405 * Call scsi_target_block() to wait for ongoing shost->queuecommand()
406 * calls before invoking i->f->terminate_rport_io().
408 scsi_target_block(rport
->dev
.parent
);
409 scsi_target_unblock(rport
->dev
.parent
, SDEV_TRANSPORT_OFFLINE
);
411 /* Involve the LLD if possible to terminate all I/O on the rport. */
412 i
= to_srp_internal(shost
->transportt
);
413 if (i
->f
->terminate_rport_io
)
414 i
->f
->terminate_rport_io(rport
);
418 * rport_fast_io_fail_timedout() - fast I/O failure timeout handler
419 * @work: Work structure used for scheduling this operation.
421 static void rport_fast_io_fail_timedout(struct work_struct
*work
)
423 struct srp_rport
*rport
= container_of(to_delayed_work(work
),
424 struct srp_rport
, fast_io_fail_work
);
425 struct Scsi_Host
*shost
= rport_to_shost(rport
);
427 pr_info("fast_io_fail_tmo expired for SRP %s / %s.\n",
428 dev_name(&rport
->dev
), dev_name(&shost
->shost_gendev
));
430 mutex_lock(&rport
->mutex
);
431 if (rport
->state
== SRP_RPORT_BLOCKED
)
432 __rport_fail_io_fast(rport
);
433 mutex_unlock(&rport
->mutex
);
437 * rport_dev_loss_timedout() - device loss timeout handler
438 * @work: Work structure used for scheduling this operation.
440 static void rport_dev_loss_timedout(struct work_struct
*work
)
442 struct srp_rport
*rport
= container_of(to_delayed_work(work
),
443 struct srp_rport
, dev_loss_work
);
444 struct Scsi_Host
*shost
= rport_to_shost(rport
);
445 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
447 pr_info("dev_loss_tmo expired for SRP %s / %s.\n",
448 dev_name(&rport
->dev
), dev_name(&shost
->shost_gendev
));
450 mutex_lock(&rport
->mutex
);
451 WARN_ON(srp_rport_set_state(rport
, SRP_RPORT_LOST
) != 0);
452 scsi_target_unblock(rport
->dev
.parent
, SDEV_TRANSPORT_OFFLINE
);
453 mutex_unlock(&rport
->mutex
);
455 i
->f
->rport_delete(rport
);
458 static void __srp_start_tl_fail_timers(struct srp_rport
*rport
)
460 struct Scsi_Host
*shost
= rport_to_shost(rport
);
461 int delay
, fast_io_fail_tmo
, dev_loss_tmo
;
463 lockdep_assert_held(&rport
->mutex
);
465 delay
= rport
->reconnect_delay
;
466 fast_io_fail_tmo
= rport
->fast_io_fail_tmo
;
467 dev_loss_tmo
= rport
->dev_loss_tmo
;
468 pr_debug("%s current state: %d\n", dev_name(&shost
->shost_gendev
),
471 if (rport
->state
== SRP_RPORT_LOST
)
474 queue_delayed_work(system_long_wq
, &rport
->reconnect_work
,
476 if ((fast_io_fail_tmo
>= 0 || dev_loss_tmo
>= 0) &&
477 srp_rport_set_state(rport
, SRP_RPORT_BLOCKED
) == 0) {
478 pr_debug("%s new state: %d\n", dev_name(&shost
->shost_gendev
),
480 scsi_target_block(&shost
->shost_gendev
);
481 if (fast_io_fail_tmo
>= 0)
482 queue_delayed_work(system_long_wq
,
483 &rport
->fast_io_fail_work
,
484 1UL * fast_io_fail_tmo
* HZ
);
485 if (dev_loss_tmo
>= 0)
486 queue_delayed_work(system_long_wq
,
487 &rport
->dev_loss_work
,
488 1UL * dev_loss_tmo
* HZ
);
493 * srp_start_tl_fail_timers() - start the transport layer failure timers
494 * @rport: SRP target port.
496 * Start the transport layer fast I/O failure and device loss timers. Do not
497 * modify a timer that was already started.
499 void srp_start_tl_fail_timers(struct srp_rport
*rport
)
501 mutex_lock(&rport
->mutex
);
502 __srp_start_tl_fail_timers(rport
);
503 mutex_unlock(&rport
->mutex
);
505 EXPORT_SYMBOL(srp_start_tl_fail_timers
);
508 * srp_reconnect_rport() - reconnect to an SRP target port
509 * @rport: SRP target port.
511 * Blocks SCSI command queueing before invoking reconnect() such that
512 * queuecommand() won't be invoked concurrently with reconnect() from outside
513 * the SCSI EH. This is important since a reconnect() implementation may
514 * reallocate resources needed by queuecommand().
517 * - This function neither waits until outstanding requests have finished nor
518 * tries to abort these. It is the responsibility of the reconnect()
519 * function to finish outstanding commands before reconnecting to the target
521 * - It is the responsibility of the caller to ensure that the resources
522 * reallocated by the reconnect() function won't be used while this function
523 * is in progress. One possible strategy is to invoke this function from
524 * the context of the SCSI EH thread only. Another possible strategy is to
525 * lock the rport mutex inside each SCSI LLD callback that can be invoked by
526 * the SCSI EH (the scsi_host_template.eh_*() functions and also the
527 * scsi_host_template.queuecommand() function).
529 int srp_reconnect_rport(struct srp_rport
*rport
)
531 struct Scsi_Host
*shost
= rport_to_shost(rport
);
532 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
533 struct scsi_device
*sdev
;
536 pr_debug("SCSI host %s\n", dev_name(&shost
->shost_gendev
));
538 res
= mutex_lock_interruptible(&rport
->mutex
);
541 scsi_target_block(&shost
->shost_gendev
);
542 res
= rport
->state
!= SRP_RPORT_LOST
? i
->f
->reconnect(rport
) : -ENODEV
;
543 pr_debug("%s (state %d): transport.reconnect() returned %d\n",
544 dev_name(&shost
->shost_gendev
), rport
->state
, res
);
546 cancel_delayed_work(&rport
->fast_io_fail_work
);
547 cancel_delayed_work(&rport
->dev_loss_work
);
549 rport
->failed_reconnects
= 0;
550 srp_rport_set_state(rport
, SRP_RPORT_RUNNING
);
551 scsi_target_unblock(&shost
->shost_gendev
, SDEV_RUNNING
);
553 * If the SCSI error handler has offlined one or more devices,
554 * invoking scsi_target_unblock() won't change the state of
555 * these devices into running so do that explicitly.
557 spin_lock_irq(shost
->host_lock
);
558 __shost_for_each_device(sdev
, shost
)
559 if (sdev
->sdev_state
== SDEV_OFFLINE
)
560 sdev
->sdev_state
= SDEV_RUNNING
;
561 spin_unlock_irq(shost
->host_lock
);
562 } else if (rport
->state
== SRP_RPORT_RUNNING
) {
564 * srp_reconnect_rport() has been invoked with fast_io_fail
565 * and dev_loss off. Mark the port as failed and start the TL
566 * failure timers if these had not yet been started.
568 __rport_fail_io_fast(rport
);
569 scsi_target_unblock(&shost
->shost_gendev
,
570 SDEV_TRANSPORT_OFFLINE
);
571 __srp_start_tl_fail_timers(rport
);
572 } else if (rport
->state
!= SRP_RPORT_BLOCKED
) {
573 scsi_target_unblock(&shost
->shost_gendev
,
574 SDEV_TRANSPORT_OFFLINE
);
576 mutex_unlock(&rport
->mutex
);
581 EXPORT_SYMBOL(srp_reconnect_rport
);
584 * srp_timed_out() - SRP transport intercept of the SCSI timeout EH
585 * @scmd: SCSI command.
587 * If a timeout occurs while an rport is in the blocked state, ask the SCSI
588 * EH to continue waiting (BLK_EH_RESET_TIMER). Otherwise let the SCSI core
589 * handle the timeout (BLK_EH_NOT_HANDLED).
591 * Note: This function is called from soft-IRQ context and with the request
594 static enum blk_eh_timer_return
srp_timed_out(struct scsi_cmnd
*scmd
)
596 struct scsi_device
*sdev
= scmd
->device
;
597 struct Scsi_Host
*shost
= sdev
->host
;
598 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
599 struct srp_rport
*rport
= shost_to_rport(shost
);
601 pr_debug("timeout for sdev %s\n", dev_name(&sdev
->sdev_gendev
));
602 return rport
->fast_io_fail_tmo
< 0 && rport
->dev_loss_tmo
< 0 &&
603 i
->f
->reset_timer_if_blocked
&& scsi_device_blocked(sdev
) ?
604 BLK_EH_RESET_TIMER
: BLK_EH_NOT_HANDLED
;
607 static void srp_rport_release(struct device
*dev
)
609 struct srp_rport
*rport
= dev_to_rport(dev
);
611 put_device(dev
->parent
);
615 static int scsi_is_srp_rport(const struct device
*dev
)
617 return dev
->release
== srp_rport_release
;
620 static int srp_rport_match(struct attribute_container
*cont
,
623 struct Scsi_Host
*shost
;
624 struct srp_internal
*i
;
626 if (!scsi_is_srp_rport(dev
))
629 shost
= dev_to_shost(dev
->parent
);
630 if (!shost
->transportt
)
632 if (shost
->transportt
->host_attrs
.ac
.class != &srp_host_class
.class)
635 i
= to_srp_internal(shost
->transportt
);
636 return &i
->rport_attr_cont
.ac
== cont
;
639 static int srp_host_match(struct attribute_container
*cont
, struct device
*dev
)
641 struct Scsi_Host
*shost
;
642 struct srp_internal
*i
;
644 if (!scsi_is_host_device(dev
))
647 shost
= dev_to_shost(dev
);
648 if (!shost
->transportt
)
650 if (shost
->transportt
->host_attrs
.ac
.class != &srp_host_class
.class)
653 i
= to_srp_internal(shost
->transportt
);
654 return &i
->t
.host_attrs
.ac
== cont
;
658 * srp_rport_get() - increment rport reference count
659 * @rport: SRP target port.
661 void srp_rport_get(struct srp_rport
*rport
)
663 get_device(&rport
->dev
);
665 EXPORT_SYMBOL(srp_rport_get
);
668 * srp_rport_put() - decrement rport reference count
669 * @rport: SRP target port.
671 void srp_rport_put(struct srp_rport
*rport
)
673 put_device(&rport
->dev
);
675 EXPORT_SYMBOL(srp_rport_put
);
678 * srp_rport_add - add a SRP remote port to the device hierarchy
679 * @shost: scsi host the remote port is connected to.
680 * @ids: The port id for the remote port.
682 * Publishes a port to the rest of the system.
684 struct srp_rport
*srp_rport_add(struct Scsi_Host
*shost
,
685 struct srp_rport_identifiers
*ids
)
687 struct srp_rport
*rport
;
688 struct device
*parent
= &shost
->shost_gendev
;
689 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
692 rport
= kzalloc(sizeof(*rport
), GFP_KERNEL
);
694 return ERR_PTR(-ENOMEM
);
696 mutex_init(&rport
->mutex
);
698 device_initialize(&rport
->dev
);
700 rport
->dev
.parent
= get_device(parent
);
701 rport
->dev
.release
= srp_rport_release
;
703 memcpy(rport
->port_id
, ids
->port_id
, sizeof(rport
->port_id
));
704 rport
->roles
= ids
->roles
;
707 rport
->reconnect_delay
= i
->f
->reconnect_delay
?
708 *i
->f
->reconnect_delay
: 10;
709 INIT_DELAYED_WORK(&rport
->reconnect_work
, srp_reconnect_work
);
710 rport
->fast_io_fail_tmo
= i
->f
->fast_io_fail_tmo
?
711 *i
->f
->fast_io_fail_tmo
: 15;
712 rport
->dev_loss_tmo
= i
->f
->dev_loss_tmo
? *i
->f
->dev_loss_tmo
: 60;
713 INIT_DELAYED_WORK(&rport
->fast_io_fail_work
,
714 rport_fast_io_fail_timedout
);
715 INIT_DELAYED_WORK(&rport
->dev_loss_work
, rport_dev_loss_timedout
);
717 id
= atomic_inc_return(&to_srp_host_attrs(shost
)->next_port_id
);
718 dev_set_name(&rport
->dev
, "port-%d:%d", shost
->host_no
, id
);
720 transport_setup_device(&rport
->dev
);
722 ret
= device_add(&rport
->dev
);
724 transport_destroy_device(&rport
->dev
);
725 put_device(&rport
->dev
);
729 transport_add_device(&rport
->dev
);
730 transport_configure_device(&rport
->dev
);
734 EXPORT_SYMBOL_GPL(srp_rport_add
);
737 * srp_rport_del - remove a SRP remote port
738 * @rport: SRP remote port to remove
740 * Removes the specified SRP remote port.
742 void srp_rport_del(struct srp_rport
*rport
)
744 struct device
*dev
= &rport
->dev
;
746 transport_remove_device(dev
);
748 transport_destroy_device(dev
);
752 EXPORT_SYMBOL_GPL(srp_rport_del
);
754 static int do_srp_rport_del(struct device
*dev
, void *data
)
756 if (scsi_is_srp_rport(dev
))
757 srp_rport_del(dev_to_rport(dev
));
762 * srp_remove_host - tear down a Scsi_Host's SRP data structures
763 * @shost: Scsi Host that is torn down
765 * Removes all SRP remote ports for a given Scsi_Host.
766 * Must be called just before scsi_remove_host for SRP HBAs.
768 void srp_remove_host(struct Scsi_Host
*shost
)
770 device_for_each_child(&shost
->shost_gendev
, NULL
, do_srp_rport_del
);
772 EXPORT_SYMBOL_GPL(srp_remove_host
);
775 * srp_stop_rport_timers - stop the transport layer recovery timers
776 * @rport: SRP remote port for which to stop the timers.
778 * Must be called after srp_remove_host() and scsi_remove_host(). The caller
779 * must hold a reference on the rport (rport->dev) and on the SCSI host
780 * (rport->dev.parent).
782 void srp_stop_rport_timers(struct srp_rport
*rport
)
784 mutex_lock(&rport
->mutex
);
785 if (rport
->state
== SRP_RPORT_BLOCKED
)
786 __rport_fail_io_fast(rport
);
787 srp_rport_set_state(rport
, SRP_RPORT_LOST
);
788 mutex_unlock(&rport
->mutex
);
790 cancel_delayed_work_sync(&rport
->reconnect_work
);
791 cancel_delayed_work_sync(&rport
->fast_io_fail_work
);
792 cancel_delayed_work_sync(&rport
->dev_loss_work
);
794 EXPORT_SYMBOL_GPL(srp_stop_rport_timers
);
796 static int srp_tsk_mgmt_response(struct Scsi_Host
*shost
, u64 nexus
, u64 tm_id
,
799 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
800 return i
->f
->tsk_mgmt_response(shost
, nexus
, tm_id
, result
);
803 static int srp_it_nexus_response(struct Scsi_Host
*shost
, u64 nexus
, int result
)
805 struct srp_internal
*i
= to_srp_internal(shost
->transportt
);
806 return i
->f
->it_nexus_response(shost
, nexus
, result
);
810 * srp_attach_transport - instantiate SRP transport template
811 * @ft: SRP transport class function template
813 struct scsi_transport_template
*
814 srp_attach_transport(struct srp_function_template
*ft
)
817 struct srp_internal
*i
;
819 i
= kzalloc(sizeof(*i
), GFP_KERNEL
);
823 i
->t
.eh_timed_out
= srp_timed_out
;
825 i
->t
.tsk_mgmt_response
= srp_tsk_mgmt_response
;
826 i
->t
.it_nexus_response
= srp_it_nexus_response
;
828 i
->t
.host_size
= sizeof(struct srp_host_attrs
);
829 i
->t
.host_attrs
.ac
.attrs
= &i
->host_attrs
[0];
830 i
->t
.host_attrs
.ac
.class = &srp_host_class
.class;
831 i
->t
.host_attrs
.ac
.match
= srp_host_match
;
832 i
->host_attrs
[0] = NULL
;
833 transport_container_register(&i
->t
.host_attrs
);
835 i
->rport_attr_cont
.ac
.attrs
= &i
->rport_attrs
[0];
836 i
->rport_attr_cont
.ac
.class = &srp_rport_class
.class;
837 i
->rport_attr_cont
.ac
.match
= srp_rport_match
;
840 i
->rport_attrs
[count
++] = &dev_attr_port_id
;
841 i
->rport_attrs
[count
++] = &dev_attr_roles
;
842 if (ft
->has_rport_state
) {
843 i
->rport_attrs
[count
++] = &dev_attr_state
;
844 i
->rport_attrs
[count
++] = &dev_attr_fast_io_fail_tmo
;
845 i
->rport_attrs
[count
++] = &dev_attr_dev_loss_tmo
;
848 i
->rport_attrs
[count
++] = &dev_attr_reconnect_delay
;
849 i
->rport_attrs
[count
++] = &dev_attr_failed_reconnects
;
851 if (ft
->rport_delete
)
852 i
->rport_attrs
[count
++] = &dev_attr_delete
;
853 i
->rport_attrs
[count
++] = NULL
;
854 BUG_ON(count
> ARRAY_SIZE(i
->rport_attrs
));
856 transport_container_register(&i
->rport_attr_cont
);
862 EXPORT_SYMBOL_GPL(srp_attach_transport
);
865 * srp_release_transport - release SRP transport template instance
866 * @t: transport template instance
868 void srp_release_transport(struct scsi_transport_template
*t
)
870 struct srp_internal
*i
= to_srp_internal(t
);
872 transport_container_unregister(&i
->t
.host_attrs
);
873 transport_container_unregister(&i
->rport_attr_cont
);
877 EXPORT_SYMBOL_GPL(srp_release_transport
);
879 static __init
int srp_transport_init(void)
883 ret
= transport_class_register(&srp_host_class
);
886 ret
= transport_class_register(&srp_rport_class
);
888 goto unregister_host_class
;
891 unregister_host_class
:
892 transport_class_unregister(&srp_host_class
);
896 static void __exit
srp_transport_exit(void)
898 transport_class_unregister(&srp_host_class
);
899 transport_class_unregister(&srp_rport_class
);
902 MODULE_AUTHOR("FUJITA Tomonori");
903 MODULE_DESCRIPTION("SRP Transport Attributes");
904 MODULE_LICENSE("GPL");
906 module_init(srp_transport_init
);
907 module_exit(srp_transport_exit
);