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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * SCSI RDMA (SRP) transport class4 *5 * Copyright (C) 2007 FUJITA Tomonori <tomof@acm.org>6 */7#include <linux/init.h>8#include <linux/module.h>9#include <linux/jiffies.h>10#include <linux/err.h>11#include <linux/slab.h>12#include <linux/string.h>13 14#include <scsi/scsi.h>15#include <scsi/scsi_cmnd.h>16#include <scsi/scsi_device.h>17#include <scsi/scsi_host.h>18#include <scsi/scsi_transport.h>19#include <scsi/scsi_transport_srp.h>20#include "scsi_priv.h"21 22struct srp_host_attrs {23 atomic_t next_port_id;24};25#define to_srp_host_attrs(host) ((struct srp_host_attrs *)(host)->shost_data)26 27#define SRP_HOST_ATTRS 028#define SRP_RPORT_ATTRS 829 30struct srp_internal {31 struct scsi_transport_template t;32 struct srp_function_template *f;33 34 struct device_attribute *host_attrs[SRP_HOST_ATTRS + 1];35 36 struct device_attribute *rport_attrs[SRP_RPORT_ATTRS + 1];37 struct transport_container rport_attr_cont;38};39 40static int scsi_is_srp_rport(const struct device *dev);41 42#define to_srp_internal(tmpl) container_of(tmpl, struct srp_internal, t)43 44#define dev_to_rport(d) container_of(d, struct srp_rport, dev)45#define transport_class_to_srp_rport(dev) dev_to_rport((dev)->parent)46static inline struct Scsi_Host *rport_to_shost(struct srp_rport *r)47{48 return dev_to_shost(r->dev.parent);49}50 51static int find_child_rport(struct device *dev, void *data)52{53 struct device **child = data;54 55 if (scsi_is_srp_rport(dev)) {56 WARN_ON_ONCE(*child);57 *child = dev;58 }59 return 0;60}61 62static inline struct srp_rport *shost_to_rport(struct Scsi_Host *shost)63{64 struct device *child = NULL;65 66 WARN_ON_ONCE(device_for_each_child(&shost->shost_gendev, &child,67 find_child_rport) < 0);68 return child ? dev_to_rport(child) : NULL;69}70 71/**72 * srp_tmo_valid() - check timeout combination validity73 * @reconnect_delay: Reconnect delay in seconds.74 * @fast_io_fail_tmo: Fast I/O fail timeout in seconds.75 * @dev_loss_tmo: Device loss timeout in seconds.76 *77 * The combination of the timeout parameters must be such that SCSI commands78 * are finished in a reasonable time. Hence do not allow the fast I/O fail79 * timeout to exceed SCSI_DEVICE_BLOCK_MAX_TIMEOUT nor allow dev_loss_tmo to80 * exceed that limit if failing I/O fast has been disabled. Furthermore, these81 * parameters must be such that multipath can detect failed paths timely.82 * Hence do not allow all three parameters to be disabled simultaneously.83 */84int srp_tmo_valid(int reconnect_delay, int fast_io_fail_tmo, long dev_loss_tmo)85{86 if (reconnect_delay < 0 && fast_io_fail_tmo < 0 && dev_loss_tmo < 0)87 return -EINVAL;88 if (reconnect_delay == 0)89 return -EINVAL;90 if (fast_io_fail_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)91 return -EINVAL;92 if (fast_io_fail_tmo < 0 &&93 dev_loss_tmo > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)94 return -EINVAL;95 if (dev_loss_tmo >= LONG_MAX / HZ)96 return -EINVAL;97 if (fast_io_fail_tmo >= 0 && dev_loss_tmo >= 0 &&98 fast_io_fail_tmo >= dev_loss_tmo)99 return -EINVAL;100 return 0;101}102EXPORT_SYMBOL_GPL(srp_tmo_valid);103 104static int srp_host_setup(struct transport_container *tc, struct device *dev,105 struct device *cdev)106{107 struct Scsi_Host *shost = dev_to_shost(dev);108 struct srp_host_attrs *srp_host = to_srp_host_attrs(shost);109 110 atomic_set(&srp_host->next_port_id, 0);111 return 0;112}113 114static DECLARE_TRANSPORT_CLASS(srp_host_class, "srp_host", srp_host_setup,115 NULL, NULL);116 117static DECLARE_TRANSPORT_CLASS(srp_rport_class, "srp_remote_ports",118 NULL, NULL, NULL);119 120static ssize_t121show_srp_rport_id(struct device *dev, struct device_attribute *attr,122 char *buf)123{124 struct srp_rport *rport = transport_class_to_srp_rport(dev);125 return sprintf(buf, "%16phC\n", rport->port_id);126}127 128static DEVICE_ATTR(port_id, S_IRUGO, show_srp_rport_id, NULL);129 130static const struct {131 u32 value;132 char *name;133} srp_rport_role_names[] = {134 {SRP_RPORT_ROLE_INITIATOR, "SRP Initiator"},135 {SRP_RPORT_ROLE_TARGET, "SRP Target"},136};137 138static ssize_t139show_srp_rport_roles(struct device *dev, struct device_attribute *attr,140 char *buf)141{142 struct srp_rport *rport = transport_class_to_srp_rport(dev);143 int i;144 char *name = NULL;145 146 for (i = 0; i < ARRAY_SIZE(srp_rport_role_names); i++)147 if (srp_rport_role_names[i].value == rport->roles) {148 name = srp_rport_role_names[i].name;149 break;150 }151 return sprintf(buf, "%s\n", name ? : "unknown");152}153 154static DEVICE_ATTR(roles, S_IRUGO, show_srp_rport_roles, NULL);155 156static ssize_t store_srp_rport_delete(struct device *dev,157 struct device_attribute *attr,158 const char *buf, size_t count)159{160 struct srp_rport *rport = transport_class_to_srp_rport(dev);161 struct Scsi_Host *shost = dev_to_shost(dev);162 struct srp_internal *i = to_srp_internal(shost->transportt);163 164 if (i->f->rport_delete) {165 i->f->rport_delete(rport);166 return count;167 } else {168 return -ENOSYS;169 }170}171 172static DEVICE_ATTR(delete, S_IWUSR, NULL, store_srp_rport_delete);173 174static ssize_t show_srp_rport_state(struct device *dev,175 struct device_attribute *attr,176 char *buf)177{178 static const char *const state_name[] = {179 [SRP_RPORT_RUNNING] = "running",180 [SRP_RPORT_BLOCKED] = "blocked",181 [SRP_RPORT_FAIL_FAST] = "fail-fast",182 [SRP_RPORT_LOST] = "lost",183 };184 struct srp_rport *rport = transport_class_to_srp_rport(dev);185 enum srp_rport_state state = rport->state;186 187 return sprintf(buf, "%s\n",188 (unsigned)state < ARRAY_SIZE(state_name) ?189 state_name[state] : "???");190}191 192static DEVICE_ATTR(state, S_IRUGO, show_srp_rport_state, NULL);193 194static ssize_t srp_show_tmo(char *buf, int tmo)195{196 return tmo >= 0 ? sprintf(buf, "%d\n", tmo) : sprintf(buf, "off\n");197}198 199int srp_parse_tmo(int *tmo, const char *buf)200{201 int res = 0;202 203 if (strncmp(buf, "off", 3) != 0)204 res = kstrtoint(buf, 0, tmo);205 else206 *tmo = -1;207 208 return res;209}210EXPORT_SYMBOL(srp_parse_tmo);211 212static ssize_t show_reconnect_delay(struct device *dev,213 struct device_attribute *attr, char *buf)214{215 struct srp_rport *rport = transport_class_to_srp_rport(dev);216 217 return srp_show_tmo(buf, rport->reconnect_delay);218}219 220static ssize_t store_reconnect_delay(struct device *dev,221 struct device_attribute *attr,222 const char *buf, const size_t count)223{224 struct srp_rport *rport = transport_class_to_srp_rport(dev);225 int res, delay;226 227 res = srp_parse_tmo(&delay, buf);228 if (res)229 goto out;230 res = srp_tmo_valid(delay, rport->fast_io_fail_tmo,231 rport->dev_loss_tmo);232 if (res)233 goto out;234 235 if (rport->reconnect_delay <= 0 && delay > 0 &&236 rport->state != SRP_RPORT_RUNNING) {237 queue_delayed_work(system_long_wq, &rport->reconnect_work,238 delay * HZ);239 } else if (delay <= 0) {240 cancel_delayed_work(&rport->reconnect_work);241 }242 rport->reconnect_delay = delay;243 res = count;244 245out:246 return res;247}248 249static DEVICE_ATTR(reconnect_delay, S_IRUGO | S_IWUSR, show_reconnect_delay,250 store_reconnect_delay);251 252static ssize_t show_failed_reconnects(struct device *dev,253 struct device_attribute *attr, char *buf)254{255 struct srp_rport *rport = transport_class_to_srp_rport(dev);256 257 return sprintf(buf, "%d\n", rport->failed_reconnects);258}259 260static DEVICE_ATTR(failed_reconnects, S_IRUGO, show_failed_reconnects, NULL);261 262static ssize_t show_srp_rport_fast_io_fail_tmo(struct device *dev,263 struct device_attribute *attr,264 char *buf)265{266 struct srp_rport *rport = transport_class_to_srp_rport(dev);267 268 return srp_show_tmo(buf, rport->fast_io_fail_tmo);269}270 271static ssize_t store_srp_rport_fast_io_fail_tmo(struct device *dev,272 struct device_attribute *attr,273 const char *buf, size_t count)274{275 struct srp_rport *rport = transport_class_to_srp_rport(dev);276 int res;277 int fast_io_fail_tmo;278 279 res = srp_parse_tmo(&fast_io_fail_tmo, buf);280 if (res)281 goto out;282 res = srp_tmo_valid(rport->reconnect_delay, fast_io_fail_tmo,283 rport->dev_loss_tmo);284 if (res)285 goto out;286 rport->fast_io_fail_tmo = fast_io_fail_tmo;287 res = count;288 289out:290 return res;291}292 293static DEVICE_ATTR(fast_io_fail_tmo, S_IRUGO | S_IWUSR,294 show_srp_rport_fast_io_fail_tmo,295 store_srp_rport_fast_io_fail_tmo);296 297static ssize_t show_srp_rport_dev_loss_tmo(struct device *dev,298 struct device_attribute *attr,299 char *buf)300{301 struct srp_rport *rport = transport_class_to_srp_rport(dev);302 303 return srp_show_tmo(buf, rport->dev_loss_tmo);304}305 306static ssize_t store_srp_rport_dev_loss_tmo(struct device *dev,307 struct device_attribute *attr,308 const char *buf, size_t count)309{310 struct srp_rport *rport = transport_class_to_srp_rport(dev);311 int res;312 int dev_loss_tmo;313 314 res = srp_parse_tmo(&dev_loss_tmo, buf);315 if (res)316 goto out;317 res = srp_tmo_valid(rport->reconnect_delay, rport->fast_io_fail_tmo,318 dev_loss_tmo);319 if (res)320 goto out;321 rport->dev_loss_tmo = dev_loss_tmo;322 res = count;323 324out:325 return res;326}327 328static DEVICE_ATTR(dev_loss_tmo, S_IRUGO | S_IWUSR,329 show_srp_rport_dev_loss_tmo,330 store_srp_rport_dev_loss_tmo);331 332static int srp_rport_set_state(struct srp_rport *rport,333 enum srp_rport_state new_state)334{335 enum srp_rport_state old_state = rport->state;336 337 lockdep_assert_held(&rport->mutex);338 339 switch (new_state) {340 case SRP_RPORT_RUNNING:341 switch (old_state) {342 case SRP_RPORT_LOST:343 goto invalid;344 default:345 break;346 }347 break;348 case SRP_RPORT_BLOCKED:349 switch (old_state) {350 case SRP_RPORT_RUNNING:351 break;352 default:353 goto invalid;354 }355 break;356 case SRP_RPORT_FAIL_FAST:357 switch (old_state) {358 case SRP_RPORT_LOST:359 goto invalid;360 default:361 break;362 }363 break;364 case SRP_RPORT_LOST:365 break;366 }367 rport->state = new_state;368 return 0;369 370invalid:371 return -EINVAL;372}373 374/**375 * srp_reconnect_work() - reconnect and schedule a new attempt if necessary376 * @work: Work structure used for scheduling this operation.377 */378static void srp_reconnect_work(struct work_struct *work)379{380 struct srp_rport *rport = container_of(to_delayed_work(work),381 struct srp_rport, reconnect_work);382 struct Scsi_Host *shost = rport_to_shost(rport);383 int delay, res;384 385 res = srp_reconnect_rport(rport);386 if (res != 0) {387 shost_printk(KERN_ERR, shost,388 "reconnect attempt %d failed (%d)\n",389 ++rport->failed_reconnects, res);390 delay = rport->reconnect_delay *391 min(100, max(1, rport->failed_reconnects - 10));392 if (delay > 0)393 queue_delayed_work(system_long_wq,394 &rport->reconnect_work, delay * HZ);395 }396}397 398/*399 * scsi_block_targets() must have been called before this function is400 * called to guarantee that no .queuecommand() calls are in progress.401 */402static void __rport_fail_io_fast(struct srp_rport *rport)403{404 struct Scsi_Host *shost = rport_to_shost(rport);405 struct srp_internal *i;406 407 lockdep_assert_held(&rport->mutex);408 409 if (srp_rport_set_state(rport, SRP_RPORT_FAIL_FAST))410 return;411 412 scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);413 414 /* Involve the LLD if possible to terminate all I/O on the rport. */415 i = to_srp_internal(shost->transportt);416 if (i->f->terminate_rport_io)417 i->f->terminate_rport_io(rport);418}419 420/**421 * rport_fast_io_fail_timedout() - fast I/O failure timeout handler422 * @work: Work structure used for scheduling this operation.423 */424static void rport_fast_io_fail_timedout(struct work_struct *work)425{426 struct srp_rport *rport = container_of(to_delayed_work(work),427 struct srp_rport, fast_io_fail_work);428 struct Scsi_Host *shost = rport_to_shost(rport);429 430 pr_info("fast_io_fail_tmo expired for SRP %s / %s.\n",431 dev_name(&rport->dev), dev_name(&shost->shost_gendev));432 433 mutex_lock(&rport->mutex);434 if (rport->state == SRP_RPORT_BLOCKED)435 __rport_fail_io_fast(rport);436 mutex_unlock(&rport->mutex);437}438 439/**440 * rport_dev_loss_timedout() - device loss timeout handler441 * @work: Work structure used for scheduling this operation.442 */443static void rport_dev_loss_timedout(struct work_struct *work)444{445 struct srp_rport *rport = container_of(to_delayed_work(work),446 struct srp_rport, dev_loss_work);447 struct Scsi_Host *shost = rport_to_shost(rport);448 struct srp_internal *i = to_srp_internal(shost->transportt);449 450 pr_info("dev_loss_tmo expired for SRP %s / %s.\n",451 dev_name(&rport->dev), dev_name(&shost->shost_gendev));452 453 mutex_lock(&rport->mutex);454 WARN_ON(srp_rport_set_state(rport, SRP_RPORT_LOST) != 0);455 scsi_target_unblock(rport->dev.parent, SDEV_TRANSPORT_OFFLINE);456 mutex_unlock(&rport->mutex);457 458 i->f->rport_delete(rport);459}460 461static void __srp_start_tl_fail_timers(struct srp_rport *rport)462{463 struct Scsi_Host *shost = rport_to_shost(rport);464 int delay, fast_io_fail_tmo, dev_loss_tmo;465 466 lockdep_assert_held(&rport->mutex);467 468 delay = rport->reconnect_delay;469 fast_io_fail_tmo = rport->fast_io_fail_tmo;470 dev_loss_tmo = rport->dev_loss_tmo;471 pr_debug("%s current state: %d\n", dev_name(&shost->shost_gendev),472 rport->state);473 474 if (rport->state == SRP_RPORT_LOST)475 return;476 if (delay > 0)477 queue_delayed_work(system_long_wq, &rport->reconnect_work,478 1UL * delay * HZ);479 if ((fast_io_fail_tmo >= 0 || dev_loss_tmo >= 0) &&480 srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) {481 pr_debug("%s new state: %d\n", dev_name(&shost->shost_gendev),482 rport->state);483 scsi_block_targets(shost, &shost->shost_gendev);484 if (fast_io_fail_tmo >= 0)485 queue_delayed_work(system_long_wq,486 &rport->fast_io_fail_work,487 1UL * fast_io_fail_tmo * HZ);488 if (dev_loss_tmo >= 0)489 queue_delayed_work(system_long_wq,490 &rport->dev_loss_work,491 1UL * dev_loss_tmo * HZ);492 }493}494 495/**496 * srp_start_tl_fail_timers() - start the transport layer failure timers497 * @rport: SRP target port.498 *499 * Start the transport layer fast I/O failure and device loss timers. Do not500 * modify a timer that was already started.501 */502void srp_start_tl_fail_timers(struct srp_rport *rport)503{504 mutex_lock(&rport->mutex);505 __srp_start_tl_fail_timers(rport);506 mutex_unlock(&rport->mutex);507}508EXPORT_SYMBOL(srp_start_tl_fail_timers);509 510/**511 * srp_reconnect_rport() - reconnect to an SRP target port512 * @rport: SRP target port.513 *514 * Blocks SCSI command queueing before invoking reconnect() such that515 * queuecommand() won't be invoked concurrently with reconnect() from outside516 * the SCSI EH. This is important since a reconnect() implementation may517 * reallocate resources needed by queuecommand().518 *519 * Notes:520 * - This function neither waits until outstanding requests have finished nor521 * tries to abort these. It is the responsibility of the reconnect()522 * function to finish outstanding commands before reconnecting to the target523 * port.524 * - It is the responsibility of the caller to ensure that the resources525 * reallocated by the reconnect() function won't be used while this function526 * is in progress. One possible strategy is to invoke this function from527 * the context of the SCSI EH thread only. Another possible strategy is to528 * lock the rport mutex inside each SCSI LLD callback that can be invoked by529 * the SCSI EH (the scsi_host_template.eh_*() functions and also the530 * scsi_host_template.queuecommand() function).531 */532int srp_reconnect_rport(struct srp_rport *rport)533{534 struct Scsi_Host *shost = rport_to_shost(rport);535 struct srp_internal *i = to_srp_internal(shost->transportt);536 struct scsi_device *sdev;537 int res;538 539 pr_debug("SCSI host %s\n", dev_name(&shost->shost_gendev));540 541 res = mutex_lock_interruptible(&rport->mutex);542 if (res)543 goto out;544 if (rport->state != SRP_RPORT_FAIL_FAST && rport->state != SRP_RPORT_LOST)545 /*546 * sdev state must be SDEV_TRANSPORT_OFFLINE, transition547 * to SDEV_BLOCK is illegal. Calling scsi_target_unblock()548 * later is ok though, scsi_internal_device_unblock_nowait()549 * treats SDEV_TRANSPORT_OFFLINE like SDEV_BLOCK.550 */551 scsi_block_targets(shost, &shost->shost_gendev);552 res = rport->state != SRP_RPORT_LOST ? i->f->reconnect(rport) : -ENODEV;553 pr_debug("%s (state %d): transport.reconnect() returned %d\n",554 dev_name(&shost->shost_gendev), rport->state, res);555 if (res == 0) {556 cancel_delayed_work(&rport->fast_io_fail_work);557 cancel_delayed_work(&rport->dev_loss_work);558 559 rport->failed_reconnects = 0;560 srp_rport_set_state(rport, SRP_RPORT_RUNNING);561 scsi_target_unblock(&shost->shost_gendev, SDEV_RUNNING);562 /*563 * If the SCSI error handler has offlined one or more devices,564 * invoking scsi_target_unblock() won't change the state of565 * these devices into running so do that explicitly.566 */567 shost_for_each_device(sdev, shost) {568 mutex_lock(&sdev->state_mutex);569 if (sdev->sdev_state == SDEV_OFFLINE)570 sdev->sdev_state = SDEV_RUNNING;571 mutex_unlock(&sdev->state_mutex);572 }573 } else if (rport->state == SRP_RPORT_RUNNING) {574 /*575 * srp_reconnect_rport() has been invoked with fast_io_fail576 * and dev_loss off. Mark the port as failed and start the TL577 * failure timers if these had not yet been started.578 */579 __rport_fail_io_fast(rport);580 __srp_start_tl_fail_timers(rport);581 } else if (rport->state != SRP_RPORT_BLOCKED) {582 scsi_target_unblock(&shost->shost_gendev,583 SDEV_TRANSPORT_OFFLINE);584 }585 mutex_unlock(&rport->mutex);586 587out:588 return res;589}590EXPORT_SYMBOL(srp_reconnect_rport);591 592/**593 * srp_timed_out() - SRP transport intercept of the SCSI timeout EH594 * @scmd: SCSI command.595 *596 * If a timeout occurs while an rport is in the blocked state, ask the SCSI597 * EH to continue waiting (SCSI_EH_RESET_TIMER). Otherwise let the SCSI core598 * handle the timeout (SCSI_EH_NOT_HANDLED).599 *600 * Note: This function is called from soft-IRQ context and with the request601 * queue lock held.602 */603enum scsi_timeout_action srp_timed_out(struct scsi_cmnd *scmd)604{605 struct scsi_device *sdev = scmd->device;606 struct Scsi_Host *shost = sdev->host;607 struct srp_internal *i = to_srp_internal(shost->transportt);608 struct srp_rport *rport = shost_to_rport(shost);609 610 pr_debug("timeout for sdev %s\n", dev_name(&sdev->sdev_gendev));611 return rport && rport->fast_io_fail_tmo < 0 &&612 rport->dev_loss_tmo < 0 &&613 i->f->reset_timer_if_blocked && scsi_device_blocked(sdev) ?614 SCSI_EH_RESET_TIMER : SCSI_EH_NOT_HANDLED;615}616EXPORT_SYMBOL(srp_timed_out);617 618static void srp_rport_release(struct device *dev)619{620 struct srp_rport *rport = dev_to_rport(dev);621 622 put_device(dev->parent);623 kfree(rport);624}625 626static int scsi_is_srp_rport(const struct device *dev)627{628 return dev->release == srp_rport_release;629}630 631static int srp_rport_match(struct attribute_container *cont,632 struct device *dev)633{634 struct Scsi_Host *shost;635 struct srp_internal *i;636 637 if (!scsi_is_srp_rport(dev))638 return 0;639 640 shost = dev_to_shost(dev->parent);641 if (!shost->transportt)642 return 0;643 if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)644 return 0;645 646 i = to_srp_internal(shost->transportt);647 return &i->rport_attr_cont.ac == cont;648}649 650static int srp_host_match(struct attribute_container *cont, struct device *dev)651{652 struct Scsi_Host *shost;653 struct srp_internal *i;654 655 if (!scsi_is_host_device(dev))656 return 0;657 658 shost = dev_to_shost(dev);659 if (!shost->transportt)660 return 0;661 if (shost->transportt->host_attrs.ac.class != &srp_host_class.class)662 return 0;663 664 i = to_srp_internal(shost->transportt);665 return &i->t.host_attrs.ac == cont;666}667 668/**669 * srp_rport_get() - increment rport reference count670 * @rport: SRP target port.671 */672void srp_rport_get(struct srp_rport *rport)673{674 get_device(&rport->dev);675}676EXPORT_SYMBOL(srp_rport_get);677 678/**679 * srp_rport_put() - decrement rport reference count680 * @rport: SRP target port.681 */682void srp_rport_put(struct srp_rport *rport)683{684 put_device(&rport->dev);685}686EXPORT_SYMBOL(srp_rport_put);687 688/**689 * srp_rport_add - add a SRP remote port to the device hierarchy690 * @shost: scsi host the remote port is connected to.691 * @ids: The port id for the remote port.692 *693 * Publishes a port to the rest of the system.694 */695struct srp_rport *srp_rport_add(struct Scsi_Host *shost,696 struct srp_rport_identifiers *ids)697{698 struct srp_rport *rport;699 struct device *parent = &shost->shost_gendev;700 struct srp_internal *i = to_srp_internal(shost->transportt);701 int id, ret;702 703 rport = kzalloc(sizeof(*rport), GFP_KERNEL);704 if (!rport)705 return ERR_PTR(-ENOMEM);706 707 mutex_init(&rport->mutex);708 709 device_initialize(&rport->dev);710 711 rport->dev.parent = get_device(parent);712 rport->dev.release = srp_rport_release;713 714 memcpy(rport->port_id, ids->port_id, sizeof(rport->port_id));715 rport->roles = ids->roles;716 717 if (i->f->reconnect)718 rport->reconnect_delay = i->f->reconnect_delay ?719 *i->f->reconnect_delay : 10;720 INIT_DELAYED_WORK(&rport->reconnect_work, srp_reconnect_work);721 rport->fast_io_fail_tmo = i->f->fast_io_fail_tmo ?722 *i->f->fast_io_fail_tmo : 15;723 rport->dev_loss_tmo = i->f->dev_loss_tmo ? *i->f->dev_loss_tmo : 60;724 INIT_DELAYED_WORK(&rport->fast_io_fail_work,725 rport_fast_io_fail_timedout);726 INIT_DELAYED_WORK(&rport->dev_loss_work, rport_dev_loss_timedout);727 728 id = atomic_inc_return(&to_srp_host_attrs(shost)->next_port_id);729 dev_set_name(&rport->dev, "port-%d:%d", shost->host_no, id);730 731 transport_setup_device(&rport->dev);732 733 ret = device_add(&rport->dev);734 if (ret) {735 transport_destroy_device(&rport->dev);736 put_device(&rport->dev);737 return ERR_PTR(ret);738 }739 740 transport_add_device(&rport->dev);741 transport_configure_device(&rport->dev);742 743 return rport;744}745EXPORT_SYMBOL_GPL(srp_rport_add);746 747/**748 * srp_rport_del - remove a SRP remote port749 * @rport: SRP remote port to remove750 *751 * Removes the specified SRP remote port.752 */753void srp_rport_del(struct srp_rport *rport)754{755 struct device *dev = &rport->dev;756 757 transport_remove_device(dev);758 device_del(dev);759 transport_destroy_device(dev);760 761 put_device(dev);762}763EXPORT_SYMBOL_GPL(srp_rport_del);764 765static int do_srp_rport_del(struct device *dev, void *data)766{767 if (scsi_is_srp_rport(dev))768 srp_rport_del(dev_to_rport(dev));769 return 0;770}771 772/**773 * srp_remove_host - tear down a Scsi_Host's SRP data structures774 * @shost: Scsi Host that is torn down775 *776 * Removes all SRP remote ports for a given Scsi_Host.777 * Must be called just before scsi_remove_host for SRP HBAs.778 */779void srp_remove_host(struct Scsi_Host *shost)780{781 device_for_each_child(&shost->shost_gendev, NULL, do_srp_rport_del);782}783EXPORT_SYMBOL_GPL(srp_remove_host);784 785/**786 * srp_stop_rport_timers - stop the transport layer recovery timers787 * @rport: SRP remote port for which to stop the timers.788 *789 * Must be called after srp_remove_host() and scsi_remove_host(). The caller790 * must hold a reference on the rport (rport->dev) and on the SCSI host791 * (rport->dev.parent).792 */793void srp_stop_rport_timers(struct srp_rport *rport)794{795 mutex_lock(&rport->mutex);796 if (rport->state == SRP_RPORT_BLOCKED)797 __rport_fail_io_fast(rport);798 srp_rport_set_state(rport, SRP_RPORT_LOST);799 mutex_unlock(&rport->mutex);800 801 cancel_delayed_work_sync(&rport->reconnect_work);802 cancel_delayed_work_sync(&rport->fast_io_fail_work);803 cancel_delayed_work_sync(&rport->dev_loss_work);804}805EXPORT_SYMBOL_GPL(srp_stop_rport_timers);806 807/**808 * srp_attach_transport - instantiate SRP transport template809 * @ft: SRP transport class function template810 */811struct scsi_transport_template *812srp_attach_transport(struct srp_function_template *ft)813{814 int count;815 struct srp_internal *i;816 817 i = kzalloc(sizeof(*i), GFP_KERNEL);818 if (!i)819 return NULL;820 821 i->t.host_size = sizeof(struct srp_host_attrs);822 i->t.host_attrs.ac.attrs = &i->host_attrs[0];823 i->t.host_attrs.ac.class = &srp_host_class.class;824 i->t.host_attrs.ac.match = srp_host_match;825 i->host_attrs[0] = NULL;826 transport_container_register(&i->t.host_attrs);827 828 i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];829 i->rport_attr_cont.ac.class = &srp_rport_class.class;830 i->rport_attr_cont.ac.match = srp_rport_match;831 832 count = 0;833 i->rport_attrs[count++] = &dev_attr_port_id;834 i->rport_attrs[count++] = &dev_attr_roles;835 if (ft->has_rport_state) {836 i->rport_attrs[count++] = &dev_attr_state;837 i->rport_attrs[count++] = &dev_attr_fast_io_fail_tmo;838 i->rport_attrs[count++] = &dev_attr_dev_loss_tmo;839 }840 if (ft->reconnect) {841 i->rport_attrs[count++] = &dev_attr_reconnect_delay;842 i->rport_attrs[count++] = &dev_attr_failed_reconnects;843 }844 if (ft->rport_delete)845 i->rport_attrs[count++] = &dev_attr_delete;846 i->rport_attrs[count++] = NULL;847 BUG_ON(count > ARRAY_SIZE(i->rport_attrs));848 849 transport_container_register(&i->rport_attr_cont);850 851 i->f = ft;852 853 return &i->t;854}855EXPORT_SYMBOL_GPL(srp_attach_transport);856 857/**858 * srp_release_transport - release SRP transport template instance859 * @t: transport template instance860 */861void srp_release_transport(struct scsi_transport_template *t)862{863 struct srp_internal *i = to_srp_internal(t);864 865 transport_container_unregister(&i->t.host_attrs);866 transport_container_unregister(&i->rport_attr_cont);867 868 kfree(i);869}870EXPORT_SYMBOL_GPL(srp_release_transport);871 872static __init int srp_transport_init(void)873{874 int ret;875 876 ret = transport_class_register(&srp_host_class);877 if (ret)878 return ret;879 ret = transport_class_register(&srp_rport_class);880 if (ret)881 goto unregister_host_class;882 883 return 0;884unregister_host_class:885 transport_class_unregister(&srp_host_class);886 return ret;887}888 889static void __exit srp_transport_exit(void)890{891 transport_class_unregister(&srp_host_class);892 transport_class_unregister(&srp_rport_class);893}894 895MODULE_AUTHOR("FUJITA Tomonori");896MODULE_DESCRIPTION("SRP Transport Attributes");897MODULE_LICENSE("GPL");898 899module_init(srp_transport_init);900module_exit(srp_transport_exit);901