2 * Copyright (c) 2005 Cisco Systems. All rights reserved.
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/slab.h>
38 #include <linux/err.h>
39 #include <linux/string.h>
40 #include <linux/parser.h>
41 #include <linux/random.h>
42 #include <linux/jiffies.h>
43 #include <rdma/ib_cache.h>
45 #include <linux/atomic.h>
47 #include <scsi/scsi.h>
48 #include <scsi/scsi_device.h>
49 #include <scsi/scsi_dbg.h>
50 #include <scsi/scsi_tcq.h>
52 #include <scsi/scsi_transport_srp.h>
56 #define DRV_NAME "ib_srp"
57 #define PFX DRV_NAME ": "
58 #define DRV_VERSION "1.0"
59 #define DRV_RELDATE "July 1, 2013"
61 MODULE_AUTHOR("Roland Dreier");
62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator");
63 MODULE_LICENSE("Dual BSD/GPL");
64 MODULE_VERSION(DRV_VERSION);
65 MODULE_INFO(release_date, DRV_RELDATE);
67 static unsigned int srp_sg_tablesize;
68 static unsigned int cmd_sg_entries;
69 static unsigned int indirect_sg_entries;
70 static bool allow_ext_sg;
71 static bool prefer_fr;
72 static bool register_always;
73 static int topspin_workarounds = 1;
75 module_param(srp_sg_tablesize, uint, 0444);
76 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
78 module_param(cmd_sg_entries, uint, 0444);
79 MODULE_PARM_DESC(cmd_sg_entries,
80 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
82 module_param(indirect_sg_entries, uint, 0444);
83 MODULE_PARM_DESC(indirect_sg_entries,
84 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SCSI_MAX_SG_CHAIN_SEGMENTS) ")");
86 module_param(allow_ext_sg, bool, 0444);
87 MODULE_PARM_DESC(allow_ext_sg,
88 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
90 module_param(topspin_workarounds, int, 0444);
91 MODULE_PARM_DESC(topspin_workarounds,
92 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
94 module_param(prefer_fr, bool, 0444);
95 MODULE_PARM_DESC(prefer_fr,
96 "Whether to use fast registration if both FMR and fast registration are supported");
98 module_param(register_always, bool, 0444);
99 MODULE_PARM_DESC(register_always,
100 "Use memory registration even for contiguous memory regions");
102 static const struct kernel_param_ops srp_tmo_ops;
104 static int srp_reconnect_delay = 10;
105 module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
107 MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
109 static int srp_fast_io_fail_tmo = 15;
110 module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
112 MODULE_PARM_DESC(fast_io_fail_tmo,
113 "Number of seconds between the observation of a transport"
114 " layer error and failing all I/O. \"off\" means that this"
115 " functionality is disabled.");
117 static int srp_dev_loss_tmo = 600;
118 module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
120 MODULE_PARM_DESC(dev_loss_tmo,
121 "Maximum number of seconds that the SRP transport should"
122 " insulate transport layer errors. After this time has been"
123 " exceeded the SCSI host is removed. Should be"
124 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
125 " if fast_io_fail_tmo has not been set. \"off\" means that"
126 " this functionality is disabled.");
128 static unsigned ch_count;
129 module_param(ch_count, uint, 0444);
130 MODULE_PARM_DESC(ch_count,
131 "Number of RDMA channels to use for communication with an SRP target. Using more than one channel improves performance if the HCA supports multiple completion vectors. The default value is the minimum of four times the number of online CPU sockets and the number of completion vectors supported by the HCA.");
133 static void srp_add_one(struct ib_device *device);
134 static void srp_remove_one(struct ib_device *device, void *client_data);
135 static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr);
136 static void srp_send_completion(struct ib_cq *cq, void *ch_ptr);
137 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
139 static struct scsi_transport_template *ib_srp_transport_template;
140 static struct workqueue_struct *srp_remove_wq;
142 static struct ib_client srp_client = {
145 .remove = srp_remove_one
148 static struct ib_sa_client srp_sa_client;
150 static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
152 int tmo = *(int *)kp->arg;
155 return sprintf(buffer, "%d", tmo);
157 return sprintf(buffer, "off");
160 static int srp_tmo_set(const char *val, const struct kernel_param *kp)
164 res = srp_parse_tmo(&tmo, val);
168 if (kp->arg == &srp_reconnect_delay)
169 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
171 else if (kp->arg == &srp_fast_io_fail_tmo)
172 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
174 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
178 *(int *)kp->arg = tmo;
184 static const struct kernel_param_ops srp_tmo_ops = {
189 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
191 return (struct srp_target_port *) host->hostdata;
194 static const char *srp_target_info(struct Scsi_Host *host)
196 return host_to_target(host)->target_name;
199 static int srp_target_is_topspin(struct srp_target_port *target)
201 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
202 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
204 return topspin_workarounds &&
205 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
206 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
209 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
211 enum dma_data_direction direction)
215 iu = kmalloc(sizeof *iu, gfp_mask);
219 iu->buf = kzalloc(size, gfp_mask);
223 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
225 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
229 iu->direction = direction;
241 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
246 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
252 static void srp_qp_event(struct ib_event *event, void *context)
254 pr_debug("QP event %s (%d)\n",
255 ib_event_msg(event->event), event->event);
258 static int srp_init_qp(struct srp_target_port *target,
261 struct ib_qp_attr *attr;
264 attr = kmalloc(sizeof *attr, GFP_KERNEL);
268 ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
269 target->srp_host->port,
270 be16_to_cpu(target->pkey),
275 attr->qp_state = IB_QPS_INIT;
276 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
277 IB_ACCESS_REMOTE_WRITE);
278 attr->port_num = target->srp_host->port;
280 ret = ib_modify_qp(qp, attr,
291 static int srp_new_cm_id(struct srp_rdma_ch *ch)
293 struct srp_target_port *target = ch->target;
294 struct ib_cm_id *new_cm_id;
296 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
298 if (IS_ERR(new_cm_id))
299 return PTR_ERR(new_cm_id);
302 ib_destroy_cm_id(ch->cm_id);
303 ch->cm_id = new_cm_id;
304 ch->path.sgid = target->sgid;
305 ch->path.dgid = target->orig_dgid;
306 ch->path.pkey = target->pkey;
307 ch->path.service_id = target->service_id;
312 static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
314 struct srp_device *dev = target->srp_host->srp_dev;
315 struct ib_fmr_pool_param fmr_param;
317 memset(&fmr_param, 0, sizeof(fmr_param));
318 fmr_param.pool_size = target->scsi_host->can_queue;
319 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
321 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
322 fmr_param.page_shift = ilog2(dev->mr_page_size);
323 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
324 IB_ACCESS_REMOTE_WRITE |
325 IB_ACCESS_REMOTE_READ);
327 return ib_create_fmr_pool(dev->pd, &fmr_param);
331 * srp_destroy_fr_pool() - free the resources owned by a pool
332 * @pool: Fast registration pool to be destroyed.
334 static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
337 struct srp_fr_desc *d;
342 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
344 ib_free_fast_reg_page_list(d->frpl);
352 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
353 * @device: IB device to allocate fast registration descriptors for.
354 * @pd: Protection domain associated with the FR descriptors.
355 * @pool_size: Number of descriptors to allocate.
356 * @max_page_list_len: Maximum fast registration work request page list length.
358 static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
359 struct ib_pd *pd, int pool_size,
360 int max_page_list_len)
362 struct srp_fr_pool *pool;
363 struct srp_fr_desc *d;
365 struct ib_fast_reg_page_list *frpl;
366 int i, ret = -EINVAL;
371 pool = kzalloc(sizeof(struct srp_fr_pool) +
372 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
375 pool->size = pool_size;
376 pool->max_page_list_len = max_page_list_len;
377 spin_lock_init(&pool->lock);
378 INIT_LIST_HEAD(&pool->free_list);
380 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
381 mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
388 frpl = ib_alloc_fast_reg_page_list(device, max_page_list_len);
394 list_add_tail(&d->entry, &pool->free_list);
401 srp_destroy_fr_pool(pool);
409 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
410 * @pool: Pool to obtain descriptor from.
412 static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
414 struct srp_fr_desc *d = NULL;
417 spin_lock_irqsave(&pool->lock, flags);
418 if (!list_empty(&pool->free_list)) {
419 d = list_first_entry(&pool->free_list, typeof(*d), entry);
422 spin_unlock_irqrestore(&pool->lock, flags);
428 * srp_fr_pool_put() - put an FR descriptor back in the free list
429 * @pool: Pool the descriptor was allocated from.
430 * @desc: Pointer to an array of fast registration descriptor pointers.
431 * @n: Number of descriptors to put back.
433 * Note: The caller must already have queued an invalidation request for
434 * desc->mr->rkey before calling this function.
436 static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
442 spin_lock_irqsave(&pool->lock, flags);
443 for (i = 0; i < n; i++)
444 list_add(&desc[i]->entry, &pool->free_list);
445 spin_unlock_irqrestore(&pool->lock, flags);
448 static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
450 struct srp_device *dev = target->srp_host->srp_dev;
452 return srp_create_fr_pool(dev->dev, dev->pd,
453 target->scsi_host->can_queue,
454 dev->max_pages_per_mr);
458 * srp_destroy_qp() - destroy an RDMA queue pair
459 * @ch: SRP RDMA channel.
461 * Change a queue pair into the error state and wait until all receive
462 * completions have been processed before destroying it. This avoids that
463 * the receive completion handler can access the queue pair while it is
466 static void srp_destroy_qp(struct srp_rdma_ch *ch)
468 static struct ib_qp_attr attr = { .qp_state = IB_QPS_ERR };
469 static struct ib_recv_wr wr = { .wr_id = SRP_LAST_WR_ID };
470 struct ib_recv_wr *bad_wr;
473 /* Destroying a QP and reusing ch->done is only safe if not connected */
474 WARN_ON_ONCE(ch->connected);
476 ret = ib_modify_qp(ch->qp, &attr, IB_QP_STATE);
477 WARN_ONCE(ret, "ib_cm_init_qp_attr() returned %d\n", ret);
481 init_completion(&ch->done);
482 ret = ib_post_recv(ch->qp, &wr, &bad_wr);
483 WARN_ONCE(ret, "ib_post_recv() returned %d\n", ret);
485 wait_for_completion(&ch->done);
488 ib_destroy_qp(ch->qp);
491 static int srp_create_ch_ib(struct srp_rdma_ch *ch)
493 struct srp_target_port *target = ch->target;
494 struct srp_device *dev = target->srp_host->srp_dev;
495 struct ib_qp_init_attr *init_attr;
496 struct ib_cq *recv_cq, *send_cq;
498 struct ib_fmr_pool *fmr_pool = NULL;
499 struct srp_fr_pool *fr_pool = NULL;
500 const int m = 1 + dev->use_fast_reg;
501 struct ib_cq_init_attr cq_attr = {};
504 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
508 /* + 1 for SRP_LAST_WR_ID */
509 cq_attr.cqe = target->queue_size + 1;
510 cq_attr.comp_vector = ch->comp_vector;
511 recv_cq = ib_create_cq(dev->dev, srp_recv_completion, NULL, ch,
513 if (IS_ERR(recv_cq)) {
514 ret = PTR_ERR(recv_cq);
518 cq_attr.cqe = m * target->queue_size;
519 cq_attr.comp_vector = ch->comp_vector;
520 send_cq = ib_create_cq(dev->dev, srp_send_completion, NULL, ch,
522 if (IS_ERR(send_cq)) {
523 ret = PTR_ERR(send_cq);
527 ib_req_notify_cq(recv_cq, IB_CQ_NEXT_COMP);
529 init_attr->event_handler = srp_qp_event;
530 init_attr->cap.max_send_wr = m * target->queue_size;
531 init_attr->cap.max_recv_wr = target->queue_size + 1;
532 init_attr->cap.max_recv_sge = 1;
533 init_attr->cap.max_send_sge = 1;
534 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
535 init_attr->qp_type = IB_QPT_RC;
536 init_attr->send_cq = send_cq;
537 init_attr->recv_cq = recv_cq;
539 qp = ib_create_qp(dev->pd, init_attr);
545 ret = srp_init_qp(target, qp);
549 if (dev->use_fast_reg && dev->has_fr) {
550 fr_pool = srp_alloc_fr_pool(target);
551 if (IS_ERR(fr_pool)) {
552 ret = PTR_ERR(fr_pool);
553 shost_printk(KERN_WARNING, target->scsi_host, PFX
554 "FR pool allocation failed (%d)\n", ret);
558 srp_destroy_fr_pool(ch->fr_pool);
559 ch->fr_pool = fr_pool;
560 } else if (!dev->use_fast_reg && dev->has_fmr) {
561 fmr_pool = srp_alloc_fmr_pool(target);
562 if (IS_ERR(fmr_pool)) {
563 ret = PTR_ERR(fmr_pool);
564 shost_printk(KERN_WARNING, target->scsi_host, PFX
565 "FMR pool allocation failed (%d)\n", ret);
569 ib_destroy_fmr_pool(ch->fmr_pool);
570 ch->fmr_pool = fmr_pool;
576 ib_destroy_cq(ch->recv_cq);
578 ib_destroy_cq(ch->send_cq);
581 ch->recv_cq = recv_cq;
582 ch->send_cq = send_cq;
591 ib_destroy_cq(send_cq);
594 ib_destroy_cq(recv_cq);
602 * Note: this function may be called without srp_alloc_iu_bufs() having been
603 * invoked. Hence the ch->[rt]x_ring checks.
605 static void srp_free_ch_ib(struct srp_target_port *target,
606 struct srp_rdma_ch *ch)
608 struct srp_device *dev = target->srp_host->srp_dev;
615 ib_destroy_cm_id(ch->cm_id);
619 /* If srp_new_cm_id() succeeded but srp_create_ch_ib() not, return. */
623 if (dev->use_fast_reg) {
625 srp_destroy_fr_pool(ch->fr_pool);
628 ib_destroy_fmr_pool(ch->fmr_pool);
631 ib_destroy_cq(ch->send_cq);
632 ib_destroy_cq(ch->recv_cq);
635 * Avoid that the SCSI error handler tries to use this channel after
636 * it has been freed. The SCSI error handler can namely continue
637 * trying to perform recovery actions after scsi_remove_host()
643 ch->send_cq = ch->recv_cq = NULL;
646 for (i = 0; i < target->queue_size; ++i)
647 srp_free_iu(target->srp_host, ch->rx_ring[i]);
652 for (i = 0; i < target->queue_size; ++i)
653 srp_free_iu(target->srp_host, ch->tx_ring[i]);
659 static void srp_path_rec_completion(int status,
660 struct ib_sa_path_rec *pathrec,
663 struct srp_rdma_ch *ch = ch_ptr;
664 struct srp_target_port *target = ch->target;
668 shost_printk(KERN_ERR, target->scsi_host,
669 PFX "Got failed path rec status %d\n", status);
675 static int srp_lookup_path(struct srp_rdma_ch *ch)
677 struct srp_target_port *target = ch->target;
680 ch->path.numb_path = 1;
682 init_completion(&ch->done);
684 ch->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
685 target->srp_host->srp_dev->dev,
686 target->srp_host->port,
688 IB_SA_PATH_REC_SERVICE_ID |
689 IB_SA_PATH_REC_DGID |
690 IB_SA_PATH_REC_SGID |
691 IB_SA_PATH_REC_NUMB_PATH |
693 SRP_PATH_REC_TIMEOUT_MS,
695 srp_path_rec_completion,
696 ch, &ch->path_query);
697 if (ch->path_query_id < 0)
698 return ch->path_query_id;
700 ret = wait_for_completion_interruptible(&ch->done);
705 shost_printk(KERN_WARNING, target->scsi_host,
706 PFX "Path record query failed\n");
711 static int srp_send_req(struct srp_rdma_ch *ch, bool multich)
713 struct srp_target_port *target = ch->target;
715 struct ib_cm_req_param param;
716 struct srp_login_req priv;
720 req = kzalloc(sizeof *req, GFP_KERNEL);
724 req->param.primary_path = &ch->path;
725 req->param.alternate_path = NULL;
726 req->param.service_id = target->service_id;
727 req->param.qp_num = ch->qp->qp_num;
728 req->param.qp_type = ch->qp->qp_type;
729 req->param.private_data = &req->priv;
730 req->param.private_data_len = sizeof req->priv;
731 req->param.flow_control = 1;
733 get_random_bytes(&req->param.starting_psn, 4);
734 req->param.starting_psn &= 0xffffff;
737 * Pick some arbitrary defaults here; we could make these
738 * module parameters if anyone cared about setting them.
740 req->param.responder_resources = 4;
741 req->param.remote_cm_response_timeout = 20;
742 req->param.local_cm_response_timeout = 20;
743 req->param.retry_count = target->tl_retry_count;
744 req->param.rnr_retry_count = 7;
745 req->param.max_cm_retries = 15;
747 req->priv.opcode = SRP_LOGIN_REQ;
749 req->priv.req_it_iu_len = cpu_to_be32(target->max_iu_len);
750 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
751 SRP_BUF_FORMAT_INDIRECT);
752 req->priv.req_flags = (multich ? SRP_MULTICHAN_MULTI :
753 SRP_MULTICHAN_SINGLE);
755 * In the published SRP specification (draft rev. 16a), the
756 * port identifier format is 8 bytes of ID extension followed
757 * by 8 bytes of GUID. Older drafts put the two halves in the
758 * opposite order, so that the GUID comes first.
760 * Targets conforming to these obsolete drafts can be
761 * recognized by the I/O Class they report.
763 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
764 memcpy(req->priv.initiator_port_id,
765 &target->sgid.global.interface_id, 8);
766 memcpy(req->priv.initiator_port_id + 8,
767 &target->initiator_ext, 8);
768 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
769 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
771 memcpy(req->priv.initiator_port_id,
772 &target->initiator_ext, 8);
773 memcpy(req->priv.initiator_port_id + 8,
774 &target->sgid.global.interface_id, 8);
775 memcpy(req->priv.target_port_id, &target->id_ext, 8);
776 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
780 * Topspin/Cisco SRP targets will reject our login unless we
781 * zero out the first 8 bytes of our initiator port ID and set
782 * the second 8 bytes to the local node GUID.
784 if (srp_target_is_topspin(target)) {
785 shost_printk(KERN_DEBUG, target->scsi_host,
786 PFX "Topspin/Cisco initiator port ID workaround "
787 "activated for target GUID %016llx\n",
788 be64_to_cpu(target->ioc_guid));
789 memset(req->priv.initiator_port_id, 0, 8);
790 memcpy(req->priv.initiator_port_id + 8,
791 &target->srp_host->srp_dev->dev->node_guid, 8);
794 status = ib_send_cm_req(ch->cm_id, &req->param);
801 static bool srp_queue_remove_work(struct srp_target_port *target)
803 bool changed = false;
805 spin_lock_irq(&target->lock);
806 if (target->state != SRP_TARGET_REMOVED) {
807 target->state = SRP_TARGET_REMOVED;
810 spin_unlock_irq(&target->lock);
813 queue_work(srp_remove_wq, &target->remove_work);
818 static void srp_disconnect_target(struct srp_target_port *target)
820 struct srp_rdma_ch *ch;
823 /* XXX should send SRP_I_LOGOUT request */
825 for (i = 0; i < target->ch_count; i++) {
827 ch->connected = false;
828 if (ch->cm_id && ib_send_cm_dreq(ch->cm_id, NULL, 0)) {
829 shost_printk(KERN_DEBUG, target->scsi_host,
830 PFX "Sending CM DREQ failed\n");
835 static void srp_free_req_data(struct srp_target_port *target,
836 struct srp_rdma_ch *ch)
838 struct srp_device *dev = target->srp_host->srp_dev;
839 struct ib_device *ibdev = dev->dev;
840 struct srp_request *req;
846 for (i = 0; i < target->req_ring_size; ++i) {
847 req = &ch->req_ring[i];
848 if (dev->use_fast_reg)
851 kfree(req->fmr_list);
852 kfree(req->map_page);
853 if (req->indirect_dma_addr) {
854 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
855 target->indirect_size,
858 kfree(req->indirect_desc);
865 static int srp_alloc_req_data(struct srp_rdma_ch *ch)
867 struct srp_target_port *target = ch->target;
868 struct srp_device *srp_dev = target->srp_host->srp_dev;
869 struct ib_device *ibdev = srp_dev->dev;
870 struct srp_request *req;
873 int i, ret = -ENOMEM;
875 ch->req_ring = kcalloc(target->req_ring_size, sizeof(*ch->req_ring),
880 for (i = 0; i < target->req_ring_size; ++i) {
881 req = &ch->req_ring[i];
882 mr_list = kmalloc(target->cmd_sg_cnt * sizeof(void *),
886 if (srp_dev->use_fast_reg)
887 req->fr_list = mr_list;
889 req->fmr_list = mr_list;
890 req->map_page = kmalloc(srp_dev->max_pages_per_mr *
891 sizeof(void *), GFP_KERNEL);
894 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
895 if (!req->indirect_desc)
898 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
899 target->indirect_size,
901 if (ib_dma_mapping_error(ibdev, dma_addr))
904 req->indirect_dma_addr = dma_addr;
913 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
914 * @shost: SCSI host whose attributes to remove from sysfs.
916 * Note: Any attributes defined in the host template and that did not exist
917 * before invocation of this function will be ignored.
919 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
921 struct device_attribute **attr;
923 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
924 device_remove_file(&shost->shost_dev, *attr);
927 static void srp_remove_target(struct srp_target_port *target)
929 struct srp_rdma_ch *ch;
932 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
934 srp_del_scsi_host_attr(target->scsi_host);
935 srp_rport_get(target->rport);
936 srp_remove_host(target->scsi_host);
937 scsi_remove_host(target->scsi_host);
938 srp_stop_rport_timers(target->rport);
939 srp_disconnect_target(target);
940 for (i = 0; i < target->ch_count; i++) {
942 srp_free_ch_ib(target, ch);
944 cancel_work_sync(&target->tl_err_work);
945 srp_rport_put(target->rport);
946 for (i = 0; i < target->ch_count; i++) {
948 srp_free_req_data(target, ch);
953 spin_lock(&target->srp_host->target_lock);
954 list_del(&target->list);
955 spin_unlock(&target->srp_host->target_lock);
957 scsi_host_put(target->scsi_host);
960 static void srp_remove_work(struct work_struct *work)
962 struct srp_target_port *target =
963 container_of(work, struct srp_target_port, remove_work);
965 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
967 srp_remove_target(target);
970 static void srp_rport_delete(struct srp_rport *rport)
972 struct srp_target_port *target = rport->lld_data;
974 srp_queue_remove_work(target);
978 * srp_connected_ch() - number of connected channels
979 * @target: SRP target port.
981 static int srp_connected_ch(struct srp_target_port *target)
985 for (i = 0; i < target->ch_count; i++)
986 c += target->ch[i].connected;
991 static int srp_connect_ch(struct srp_rdma_ch *ch, bool multich)
993 struct srp_target_port *target = ch->target;
996 WARN_ON_ONCE(!multich && srp_connected_ch(target) > 0);
998 ret = srp_lookup_path(ch);
1003 init_completion(&ch->done);
1004 ret = srp_send_req(ch, multich);
1007 ret = wait_for_completion_interruptible(&ch->done);
1012 * The CM event handling code will set status to
1013 * SRP_PORT_REDIRECT if we get a port redirect REJ
1014 * back, or SRP_DLID_REDIRECT if we get a lid/qp
1015 * redirect REJ back.
1017 switch (ch->status) {
1019 ch->connected = true;
1022 case SRP_PORT_REDIRECT:
1023 ret = srp_lookup_path(ch);
1028 case SRP_DLID_REDIRECT:
1031 case SRP_STALE_CONN:
1032 shost_printk(KERN_ERR, target->scsi_host, PFX
1033 "giving up on stale connection\n");
1034 ch->status = -ECONNRESET;
1043 static int srp_inv_rkey(struct srp_rdma_ch *ch, u32 rkey)
1045 struct ib_send_wr *bad_wr;
1046 struct ib_send_wr wr = {
1047 .opcode = IB_WR_LOCAL_INV,
1048 .wr_id = LOCAL_INV_WR_ID_MASK,
1052 .ex.invalidate_rkey = rkey,
1055 return ib_post_send(ch->qp, &wr, &bad_wr);
1058 static void srp_unmap_data(struct scsi_cmnd *scmnd,
1059 struct srp_rdma_ch *ch,
1060 struct srp_request *req)
1062 struct srp_target_port *target = ch->target;
1063 struct srp_device *dev = target->srp_host->srp_dev;
1064 struct ib_device *ibdev = dev->dev;
1067 if (!scsi_sglist(scmnd) ||
1068 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
1069 scmnd->sc_data_direction != DMA_FROM_DEVICE))
1072 if (dev->use_fast_reg) {
1073 struct srp_fr_desc **pfr;
1075 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
1076 res = srp_inv_rkey(ch, (*pfr)->mr->rkey);
1078 shost_printk(KERN_ERR, target->scsi_host, PFX
1079 "Queueing INV WR for rkey %#x failed (%d)\n",
1080 (*pfr)->mr->rkey, res);
1081 queue_work(system_long_wq,
1082 &target->tl_err_work);
1086 srp_fr_pool_put(ch->fr_pool, req->fr_list,
1089 struct ib_pool_fmr **pfmr;
1091 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1092 ib_fmr_pool_unmap(*pfmr);
1095 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1096 scmnd->sc_data_direction);
1100 * srp_claim_req - Take ownership of the scmnd associated with a request.
1101 * @ch: SRP RDMA channel.
1102 * @req: SRP request.
1103 * @sdev: If not NULL, only take ownership for this SCSI device.
1104 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1105 * ownership of @req->scmnd if it equals @scmnd.
1108 * Either NULL or a pointer to the SCSI command the caller became owner of.
1110 static struct scsi_cmnd *srp_claim_req(struct srp_rdma_ch *ch,
1111 struct srp_request *req,
1112 struct scsi_device *sdev,
1113 struct scsi_cmnd *scmnd)
1115 unsigned long flags;
1117 spin_lock_irqsave(&ch->lock, flags);
1119 (!sdev || req->scmnd->device == sdev) &&
1120 (!scmnd || req->scmnd == scmnd)) {
1126 spin_unlock_irqrestore(&ch->lock, flags);
1132 * srp_free_req() - Unmap data and add request to the free request list.
1133 * @ch: SRP RDMA channel.
1134 * @req: Request to be freed.
1135 * @scmnd: SCSI command associated with @req.
1136 * @req_lim_delta: Amount to be added to @target->req_lim.
1138 static void srp_free_req(struct srp_rdma_ch *ch, struct srp_request *req,
1139 struct scsi_cmnd *scmnd, s32 req_lim_delta)
1141 unsigned long flags;
1143 srp_unmap_data(scmnd, ch, req);
1145 spin_lock_irqsave(&ch->lock, flags);
1146 ch->req_lim += req_lim_delta;
1147 spin_unlock_irqrestore(&ch->lock, flags);
1150 static void srp_finish_req(struct srp_rdma_ch *ch, struct srp_request *req,
1151 struct scsi_device *sdev, int result)
1153 struct scsi_cmnd *scmnd = srp_claim_req(ch, req, sdev, NULL);
1156 srp_free_req(ch, req, scmnd, 0);
1157 scmnd->result = result;
1158 scmnd->scsi_done(scmnd);
1162 static void srp_terminate_io(struct srp_rport *rport)
1164 struct srp_target_port *target = rport->lld_data;
1165 struct srp_rdma_ch *ch;
1166 struct Scsi_Host *shost = target->scsi_host;
1167 struct scsi_device *sdev;
1171 * Invoking srp_terminate_io() while srp_queuecommand() is running
1172 * is not safe. Hence the warning statement below.
1174 shost_for_each_device(sdev, shost)
1175 WARN_ON_ONCE(sdev->request_queue->request_fn_active);
1177 for (i = 0; i < target->ch_count; i++) {
1178 ch = &target->ch[i];
1180 for (j = 0; j < target->req_ring_size; ++j) {
1181 struct srp_request *req = &ch->req_ring[j];
1183 srp_finish_req(ch, req, NULL,
1184 DID_TRANSPORT_FAILFAST << 16);
1190 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1191 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1192 * srp_reset_device() or srp_reset_host() calls will occur while this function
1193 * is in progress. One way to realize that is not to call this function
1194 * directly but to call srp_reconnect_rport() instead since that last function
1195 * serializes calls of this function via rport->mutex and also blocks
1196 * srp_queuecommand() calls before invoking this function.
1198 static int srp_rport_reconnect(struct srp_rport *rport)
1200 struct srp_target_port *target = rport->lld_data;
1201 struct srp_rdma_ch *ch;
1203 bool multich = false;
1205 srp_disconnect_target(target);
1207 if (target->state == SRP_TARGET_SCANNING)
1211 * Now get a new local CM ID so that we avoid confusing the target in
1212 * case things are really fouled up. Doing so also ensures that all CM
1213 * callbacks will have finished before a new QP is allocated.
1215 for (i = 0; i < target->ch_count; i++) {
1216 ch = &target->ch[i];
1217 ret += srp_new_cm_id(ch);
1219 for (i = 0; i < target->ch_count; i++) {
1220 ch = &target->ch[i];
1221 for (j = 0; j < target->req_ring_size; ++j) {
1222 struct srp_request *req = &ch->req_ring[j];
1224 srp_finish_req(ch, req, NULL, DID_RESET << 16);
1227 for (i = 0; i < target->ch_count; i++) {
1228 ch = &target->ch[i];
1230 * Whether or not creating a new CM ID succeeded, create a new
1231 * QP. This guarantees that all completion callback function
1232 * invocations have finished before request resetting starts.
1234 ret += srp_create_ch_ib(ch);
1236 INIT_LIST_HEAD(&ch->free_tx);
1237 for (j = 0; j < target->queue_size; ++j)
1238 list_add(&ch->tx_ring[j]->list, &ch->free_tx);
1241 target->qp_in_error = false;
1243 for (i = 0; i < target->ch_count; i++) {
1244 ch = &target->ch[i];
1247 ret = srp_connect_ch(ch, multich);
1252 shost_printk(KERN_INFO, target->scsi_host,
1253 PFX "reconnect succeeded\n");
1258 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1259 unsigned int dma_len, u32 rkey)
1261 struct srp_direct_buf *desc = state->desc;
1263 desc->va = cpu_to_be64(dma_addr);
1264 desc->key = cpu_to_be32(rkey);
1265 desc->len = cpu_to_be32(dma_len);
1267 state->total_len += dma_len;
1272 static int srp_map_finish_fmr(struct srp_map_state *state,
1273 struct srp_rdma_ch *ch)
1275 struct ib_pool_fmr *fmr;
1278 fmr = ib_fmr_pool_map_phys(ch->fmr_pool, state->pages,
1279 state->npages, io_addr);
1281 return PTR_ERR(fmr);
1283 *state->next_fmr++ = fmr;
1286 srp_map_desc(state, 0, state->dma_len, fmr->fmr->rkey);
1291 static int srp_map_finish_fr(struct srp_map_state *state,
1292 struct srp_rdma_ch *ch)
1294 struct srp_target_port *target = ch->target;
1295 struct srp_device *dev = target->srp_host->srp_dev;
1296 struct ib_send_wr *bad_wr;
1297 struct ib_send_wr wr;
1298 struct srp_fr_desc *desc;
1301 desc = srp_fr_pool_get(ch->fr_pool);
1305 rkey = ib_inc_rkey(desc->mr->rkey);
1306 ib_update_fast_reg_key(desc->mr, rkey);
1308 memcpy(desc->frpl->page_list, state->pages,
1309 sizeof(state->pages[0]) * state->npages);
1311 memset(&wr, 0, sizeof(wr));
1312 wr.opcode = IB_WR_FAST_REG_MR;
1313 wr.wr_id = FAST_REG_WR_ID_MASK;
1314 wr.wr.fast_reg.iova_start = state->base_dma_addr;
1315 wr.wr.fast_reg.page_list = desc->frpl;
1316 wr.wr.fast_reg.page_list_len = state->npages;
1317 wr.wr.fast_reg.page_shift = ilog2(dev->mr_page_size);
1318 wr.wr.fast_reg.length = state->dma_len;
1319 wr.wr.fast_reg.access_flags = (IB_ACCESS_LOCAL_WRITE |
1320 IB_ACCESS_REMOTE_READ |
1321 IB_ACCESS_REMOTE_WRITE);
1322 wr.wr.fast_reg.rkey = desc->mr->lkey;
1324 *state->next_fr++ = desc;
1327 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1330 return ib_post_send(ch->qp, &wr, &bad_wr);
1333 static int srp_finish_mapping(struct srp_map_state *state,
1334 struct srp_rdma_ch *ch)
1336 struct srp_target_port *target = ch->target;
1339 if (state->npages == 0)
1342 if (state->npages == 1 && !register_always)
1343 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1346 ret = target->srp_host->srp_dev->use_fast_reg ?
1347 srp_map_finish_fr(state, ch) :
1348 srp_map_finish_fmr(state, ch);
1358 static void srp_map_update_start(struct srp_map_state *state,
1359 struct scatterlist *sg, int sg_index,
1360 dma_addr_t dma_addr)
1362 state->unmapped_sg = sg;
1363 state->unmapped_index = sg_index;
1364 state->unmapped_addr = dma_addr;
1367 static int srp_map_sg_entry(struct srp_map_state *state,
1368 struct srp_rdma_ch *ch,
1369 struct scatterlist *sg, int sg_index,
1372 struct srp_target_port *target = ch->target;
1373 struct srp_device *dev = target->srp_host->srp_dev;
1374 struct ib_device *ibdev = dev->dev;
1375 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1376 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1385 * Once we're in direct map mode for a request, we don't
1386 * go back to FMR or FR mode, so no need to update anything
1387 * other than the descriptor.
1389 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1394 * Since not all RDMA HW drivers support non-zero page offsets for
1395 * FMR, if we start at an offset into a page, don't merge into the
1396 * current FMR mapping. Finish it out, and use the kernel's MR for
1399 if ((!dev->use_fast_reg && dma_addr & ~dev->mr_page_mask) ||
1400 dma_len > dev->mr_max_size) {
1401 ret = srp_finish_mapping(state, ch);
1405 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1406 srp_map_update_start(state, NULL, 0, 0);
1411 * If this is the first sg that will be mapped via FMR or via FR, save
1412 * our position. We need to know the first unmapped entry, its index,
1413 * and the first unmapped address within that entry to be able to
1414 * restart mapping after an error.
1416 if (!state->unmapped_sg)
1417 srp_map_update_start(state, sg, sg_index, dma_addr);
1420 unsigned offset = dma_addr & ~dev->mr_page_mask;
1421 if (state->npages == dev->max_pages_per_mr || offset != 0) {
1422 ret = srp_finish_mapping(state, ch);
1426 srp_map_update_start(state, sg, sg_index, dma_addr);
1429 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
1432 state->base_dma_addr = dma_addr;
1433 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
1434 state->dma_len += len;
1440 * If the last entry of the MR wasn't a full page, then we need to
1441 * close it out and start a new one -- we can only merge at page
1445 if (len != dev->mr_page_size) {
1446 ret = srp_finish_mapping(state, ch);
1448 srp_map_update_start(state, NULL, 0, 0);
1453 static int srp_map_sg(struct srp_map_state *state, struct srp_rdma_ch *ch,
1454 struct srp_request *req, struct scatterlist *scat,
1457 struct srp_target_port *target = ch->target;
1458 struct srp_device *dev = target->srp_host->srp_dev;
1459 struct ib_device *ibdev = dev->dev;
1460 struct scatterlist *sg;
1464 state->desc = req->indirect_desc;
1465 state->pages = req->map_page;
1466 if (dev->use_fast_reg) {
1467 state->next_fr = req->fr_list;
1468 use_mr = !!ch->fr_pool;
1470 state->next_fmr = req->fmr_list;
1471 use_mr = !!ch->fmr_pool;
1474 for_each_sg(scat, sg, count, i) {
1475 if (srp_map_sg_entry(state, ch, sg, i, use_mr)) {
1477 * Memory registration failed, so backtrack to the
1478 * first unmapped entry and continue on without using
1479 * memory registration.
1481 dma_addr_t dma_addr;
1482 unsigned int dma_len;
1485 sg = state->unmapped_sg;
1486 i = state->unmapped_index;
1488 dma_addr = ib_sg_dma_address(ibdev, sg);
1489 dma_len = ib_sg_dma_len(ibdev, sg);
1490 dma_len -= (state->unmapped_addr - dma_addr);
1491 dma_addr = state->unmapped_addr;
1493 srp_map_desc(state, dma_addr, dma_len, target->rkey);
1497 if (use_mr && srp_finish_mapping(state, ch))
1500 req->nmdesc = state->nmdesc;
1505 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
1506 struct srp_request *req)
1508 struct srp_target_port *target = ch->target;
1509 struct scatterlist *scat;
1510 struct srp_cmd *cmd = req->cmd->buf;
1511 int len, nents, count;
1512 struct srp_device *dev;
1513 struct ib_device *ibdev;
1514 struct srp_map_state state;
1515 struct srp_indirect_buf *indirect_hdr;
1519 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1520 return sizeof (struct srp_cmd);
1522 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1523 scmnd->sc_data_direction != DMA_TO_DEVICE) {
1524 shost_printk(KERN_WARNING, target->scsi_host,
1525 PFX "Unhandled data direction %d\n",
1526 scmnd->sc_data_direction);
1530 nents = scsi_sg_count(scmnd);
1531 scat = scsi_sglist(scmnd);
1533 dev = target->srp_host->srp_dev;
1536 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1537 if (unlikely(count == 0))
1540 fmt = SRP_DATA_DESC_DIRECT;
1541 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
1543 if (count == 1 && !register_always) {
1545 * The midlayer only generated a single gather/scatter
1546 * entry, or DMA mapping coalesced everything to a
1547 * single entry. So a direct descriptor along with
1548 * the DMA MR suffices.
1550 struct srp_direct_buf *buf = (void *) cmd->add_data;
1552 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1553 buf->key = cpu_to_be32(target->rkey);
1554 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1561 * We have more than one scatter/gather entry, so build our indirect
1562 * descriptor table, trying to merge as many entries as we can.
1564 indirect_hdr = (void *) cmd->add_data;
1566 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1567 target->indirect_size, DMA_TO_DEVICE);
1569 memset(&state, 0, sizeof(state));
1570 srp_map_sg(&state, ch, req, scat, count);
1572 /* We've mapped the request, now pull as much of the indirect
1573 * descriptor table as we can into the command buffer. If this
1574 * target is not using an external indirect table, we are
1575 * guaranteed to fit into the command, as the SCSI layer won't
1576 * give us more S/G entries than we allow.
1578 if (state.ndesc == 1) {
1580 * Memory registration collapsed the sg-list into one entry,
1581 * so use a direct descriptor.
1583 struct srp_direct_buf *buf = (void *) cmd->add_data;
1585 *buf = req->indirect_desc[0];
1589 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1590 !target->allow_ext_sg)) {
1591 shost_printk(KERN_ERR, target->scsi_host,
1592 "Could not fit S/G list into SRP_CMD\n");
1596 count = min(state.ndesc, target->cmd_sg_cnt);
1597 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1599 fmt = SRP_DATA_DESC_INDIRECT;
1600 len = sizeof(struct srp_cmd) + sizeof (struct srp_indirect_buf);
1601 len += count * sizeof (struct srp_direct_buf);
1603 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1604 count * sizeof (struct srp_direct_buf));
1606 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1607 indirect_hdr->table_desc.key = cpu_to_be32(target->rkey);
1608 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1609 indirect_hdr->len = cpu_to_be32(state.total_len);
1611 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1612 cmd->data_out_desc_cnt = count;
1614 cmd->data_in_desc_cnt = count;
1616 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1620 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1621 cmd->buf_fmt = fmt << 4;
1629 * Return an IU and possible credit to the free pool
1631 static void srp_put_tx_iu(struct srp_rdma_ch *ch, struct srp_iu *iu,
1632 enum srp_iu_type iu_type)
1634 unsigned long flags;
1636 spin_lock_irqsave(&ch->lock, flags);
1637 list_add(&iu->list, &ch->free_tx);
1638 if (iu_type != SRP_IU_RSP)
1640 spin_unlock_irqrestore(&ch->lock, flags);
1644 * Must be called with ch->lock held to protect req_lim and free_tx.
1645 * If IU is not sent, it must be returned using srp_put_tx_iu().
1648 * An upper limit for the number of allocated information units for each
1650 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
1651 * more than Scsi_Host.can_queue requests.
1652 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
1653 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
1654 * one unanswered SRP request to an initiator.
1656 static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
1657 enum srp_iu_type iu_type)
1659 struct srp_target_port *target = ch->target;
1660 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
1663 srp_send_completion(ch->send_cq, ch);
1665 if (list_empty(&ch->free_tx))
1668 /* Initiator responses to target requests do not consume credits */
1669 if (iu_type != SRP_IU_RSP) {
1670 if (ch->req_lim <= rsv) {
1671 ++target->zero_req_lim;
1678 iu = list_first_entry(&ch->free_tx, struct srp_iu, list);
1679 list_del(&iu->list);
1683 static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
1685 struct srp_target_port *target = ch->target;
1687 struct ib_send_wr wr, *bad_wr;
1689 list.addr = iu->dma;
1691 list.lkey = target->lkey;
1694 wr.wr_id = (uintptr_t) iu;
1697 wr.opcode = IB_WR_SEND;
1698 wr.send_flags = IB_SEND_SIGNALED;
1700 return ib_post_send(ch->qp, &wr, &bad_wr);
1703 static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)
1705 struct srp_target_port *target = ch->target;
1706 struct ib_recv_wr wr, *bad_wr;
1709 list.addr = iu->dma;
1710 list.length = iu->size;
1711 list.lkey = target->lkey;
1714 wr.wr_id = (uintptr_t) iu;
1718 return ib_post_recv(ch->qp, &wr, &bad_wr);
1721 static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
1723 struct srp_target_port *target = ch->target;
1724 struct srp_request *req;
1725 struct scsi_cmnd *scmnd;
1726 unsigned long flags;
1728 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
1729 spin_lock_irqsave(&ch->lock, flags);
1730 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
1731 spin_unlock_irqrestore(&ch->lock, flags);
1733 ch->tsk_mgmt_status = -1;
1734 if (be32_to_cpu(rsp->resp_data_len) >= 4)
1735 ch->tsk_mgmt_status = rsp->data[3];
1736 complete(&ch->tsk_mgmt_done);
1738 scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
1740 req = (void *)scmnd->host_scribble;
1741 scmnd = srp_claim_req(ch, req, NULL, scmnd);
1744 shost_printk(KERN_ERR, target->scsi_host,
1745 "Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\n",
1746 rsp->tag, ch - target->ch, ch->qp->qp_num);
1748 spin_lock_irqsave(&ch->lock, flags);
1749 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
1750 spin_unlock_irqrestore(&ch->lock, flags);
1754 scmnd->result = rsp->status;
1756 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
1757 memcpy(scmnd->sense_buffer, rsp->data +
1758 be32_to_cpu(rsp->resp_data_len),
1759 min_t(int, be32_to_cpu(rsp->sense_data_len),
1760 SCSI_SENSE_BUFFERSIZE));
1763 if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
1764 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
1765 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
1766 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
1767 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
1768 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
1769 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
1770 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
1772 srp_free_req(ch, req, scmnd,
1773 be32_to_cpu(rsp->req_lim_delta));
1775 scmnd->host_scribble = NULL;
1776 scmnd->scsi_done(scmnd);
1780 static int srp_response_common(struct srp_rdma_ch *ch, s32 req_delta,
1783 struct srp_target_port *target = ch->target;
1784 struct ib_device *dev = target->srp_host->srp_dev->dev;
1785 unsigned long flags;
1789 spin_lock_irqsave(&ch->lock, flags);
1790 ch->req_lim += req_delta;
1791 iu = __srp_get_tx_iu(ch, SRP_IU_RSP);
1792 spin_unlock_irqrestore(&ch->lock, flags);
1795 shost_printk(KERN_ERR, target->scsi_host, PFX
1796 "no IU available to send response\n");
1800 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
1801 memcpy(iu->buf, rsp, len);
1802 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
1804 err = srp_post_send(ch, iu, len);
1806 shost_printk(KERN_ERR, target->scsi_host, PFX
1807 "unable to post response: %d\n", err);
1808 srp_put_tx_iu(ch, iu, SRP_IU_RSP);
1814 static void srp_process_cred_req(struct srp_rdma_ch *ch,
1815 struct srp_cred_req *req)
1817 struct srp_cred_rsp rsp = {
1818 .opcode = SRP_CRED_RSP,
1821 s32 delta = be32_to_cpu(req->req_lim_delta);
1823 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
1824 shost_printk(KERN_ERR, ch->target->scsi_host, PFX
1825 "problems processing SRP_CRED_REQ\n");
1828 static void srp_process_aer_req(struct srp_rdma_ch *ch,
1829 struct srp_aer_req *req)
1831 struct srp_target_port *target = ch->target;
1832 struct srp_aer_rsp rsp = {
1833 .opcode = SRP_AER_RSP,
1836 s32 delta = be32_to_cpu(req->req_lim_delta);
1838 shost_printk(KERN_ERR, target->scsi_host, PFX
1839 "ignoring AER for LUN %llu\n", scsilun_to_int(&req->lun));
1841 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
1842 shost_printk(KERN_ERR, target->scsi_host, PFX
1843 "problems processing SRP_AER_REQ\n");
1846 static void srp_handle_recv(struct srp_rdma_ch *ch, struct ib_wc *wc)
1848 struct srp_target_port *target = ch->target;
1849 struct ib_device *dev = target->srp_host->srp_dev->dev;
1850 struct srp_iu *iu = (struct srp_iu *) (uintptr_t) wc->wr_id;
1854 ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
1857 opcode = *(u8 *) iu->buf;
1860 shost_printk(KERN_ERR, target->scsi_host,
1861 PFX "recv completion, opcode 0x%02x\n", opcode);
1862 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1863 iu->buf, wc->byte_len, true);
1868 srp_process_rsp(ch, iu->buf);
1872 srp_process_cred_req(ch, iu->buf);
1876 srp_process_aer_req(ch, iu->buf);
1880 /* XXX Handle target logout */
1881 shost_printk(KERN_WARNING, target->scsi_host,
1882 PFX "Got target logout request\n");
1886 shost_printk(KERN_WARNING, target->scsi_host,
1887 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1891 ib_dma_sync_single_for_device(dev, iu->dma, ch->max_ti_iu_len,
1894 res = srp_post_recv(ch, iu);
1896 shost_printk(KERN_ERR, target->scsi_host,
1897 PFX "Recv failed with error code %d\n", res);
1901 * srp_tl_err_work() - handle a transport layer error
1902 * @work: Work structure embedded in an SRP target port.
1904 * Note: This function may get invoked before the rport has been created,
1905 * hence the target->rport test.
1907 static void srp_tl_err_work(struct work_struct *work)
1909 struct srp_target_port *target;
1911 target = container_of(work, struct srp_target_port, tl_err_work);
1913 srp_start_tl_fail_timers(target->rport);
1916 static void srp_handle_qp_err(u64 wr_id, enum ib_wc_status wc_status,
1917 bool send_err, struct srp_rdma_ch *ch)
1919 struct srp_target_port *target = ch->target;
1921 if (wr_id == SRP_LAST_WR_ID) {
1922 complete(&ch->done);
1926 if (ch->connected && !target->qp_in_error) {
1927 if (wr_id & LOCAL_INV_WR_ID_MASK) {
1928 shost_printk(KERN_ERR, target->scsi_host, PFX
1929 "LOCAL_INV failed with status %s (%d)\n",
1930 ib_wc_status_msg(wc_status), wc_status);
1931 } else if (wr_id & FAST_REG_WR_ID_MASK) {
1932 shost_printk(KERN_ERR, target->scsi_host, PFX
1933 "FAST_REG_MR failed status %s (%d)\n",
1934 ib_wc_status_msg(wc_status), wc_status);
1936 shost_printk(KERN_ERR, target->scsi_host,
1937 PFX "failed %s status %s (%d) for iu %p\n",
1938 send_err ? "send" : "receive",
1939 ib_wc_status_msg(wc_status), wc_status,
1940 (void *)(uintptr_t)wr_id);
1942 queue_work(system_long_wq, &target->tl_err_work);
1944 target->qp_in_error = true;
1947 static void srp_recv_completion(struct ib_cq *cq, void *ch_ptr)
1949 struct srp_rdma_ch *ch = ch_ptr;
1952 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1953 while (ib_poll_cq(cq, 1, &wc) > 0) {
1954 if (likely(wc.status == IB_WC_SUCCESS)) {
1955 srp_handle_recv(ch, &wc);
1957 srp_handle_qp_err(wc.wr_id, wc.status, false, ch);
1962 static void srp_send_completion(struct ib_cq *cq, void *ch_ptr)
1964 struct srp_rdma_ch *ch = ch_ptr;
1968 while (ib_poll_cq(cq, 1, &wc) > 0) {
1969 if (likely(wc.status == IB_WC_SUCCESS)) {
1970 iu = (struct srp_iu *) (uintptr_t) wc.wr_id;
1971 list_add(&iu->list, &ch->free_tx);
1973 srp_handle_qp_err(wc.wr_id, wc.status, true, ch);
1978 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
1980 struct srp_target_port *target = host_to_target(shost);
1981 struct srp_rport *rport = target->rport;
1982 struct srp_rdma_ch *ch;
1983 struct srp_request *req;
1985 struct srp_cmd *cmd;
1986 struct ib_device *dev;
1987 unsigned long flags;
1991 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
1994 * The SCSI EH thread is the only context from which srp_queuecommand()
1995 * can get invoked for blocked devices (SDEV_BLOCK /
1996 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
1997 * locking the rport mutex if invoked from inside the SCSI EH.
2000 mutex_lock(&rport->mutex);
2002 scmnd->result = srp_chkready(target->rport);
2003 if (unlikely(scmnd->result))
2006 WARN_ON_ONCE(scmnd->request->tag < 0);
2007 tag = blk_mq_unique_tag(scmnd->request);
2008 ch = &target->ch[blk_mq_unique_tag_to_hwq(tag)];
2009 idx = blk_mq_unique_tag_to_tag(tag);
2010 WARN_ONCE(idx >= target->req_ring_size, "%s: tag %#x: idx %d >= %d\n",
2011 dev_name(&shost->shost_gendev), tag, idx,
2012 target->req_ring_size);
2014 spin_lock_irqsave(&ch->lock, flags);
2015 iu = __srp_get_tx_iu(ch, SRP_IU_CMD);
2016 spin_unlock_irqrestore(&ch->lock, flags);
2021 req = &ch->req_ring[idx];
2022 dev = target->srp_host->srp_dev->dev;
2023 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_iu_len,
2026 scmnd->host_scribble = (void *) req;
2029 memset(cmd, 0, sizeof *cmd);
2031 cmd->opcode = SRP_CMD;
2032 int_to_scsilun(scmnd->device->lun, &cmd->lun);
2034 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
2039 len = srp_map_data(scmnd, ch, req);
2041 shost_printk(KERN_ERR, target->scsi_host,
2042 PFX "Failed to map data (%d)\n", len);
2044 * If we ran out of memory descriptors (-ENOMEM) because an
2045 * application is queuing many requests with more than
2046 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
2047 * to reduce queue depth temporarily.
2049 scmnd->result = len == -ENOMEM ?
2050 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
2054 ib_dma_sync_single_for_device(dev, iu->dma, target->max_iu_len,
2057 if (srp_post_send(ch, iu, len)) {
2058 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
2066 mutex_unlock(&rport->mutex);
2071 srp_unmap_data(scmnd, ch, req);
2074 srp_put_tx_iu(ch, iu, SRP_IU_CMD);
2077 * Avoid that the loops that iterate over the request ring can
2078 * encounter a dangling SCSI command pointer.
2083 if (scmnd->result) {
2084 scmnd->scsi_done(scmnd);
2087 ret = SCSI_MLQUEUE_HOST_BUSY;
2094 * Note: the resources allocated in this function are freed in
2097 static int srp_alloc_iu_bufs(struct srp_rdma_ch *ch)
2099 struct srp_target_port *target = ch->target;
2102 ch->rx_ring = kcalloc(target->queue_size, sizeof(*ch->rx_ring),
2106 ch->tx_ring = kcalloc(target->queue_size, sizeof(*ch->tx_ring),
2111 for (i = 0; i < target->queue_size; ++i) {
2112 ch->rx_ring[i] = srp_alloc_iu(target->srp_host,
2114 GFP_KERNEL, DMA_FROM_DEVICE);
2115 if (!ch->rx_ring[i])
2119 for (i = 0; i < target->queue_size; ++i) {
2120 ch->tx_ring[i] = srp_alloc_iu(target->srp_host,
2122 GFP_KERNEL, DMA_TO_DEVICE);
2123 if (!ch->tx_ring[i])
2126 list_add(&ch->tx_ring[i]->list, &ch->free_tx);
2132 for (i = 0; i < target->queue_size; ++i) {
2133 srp_free_iu(target->srp_host, ch->rx_ring[i]);
2134 srp_free_iu(target->srp_host, ch->tx_ring[i]);
2147 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2149 uint64_t T_tr_ns, max_compl_time_ms;
2150 uint32_t rq_tmo_jiffies;
2153 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2154 * table 91), both the QP timeout and the retry count have to be set
2155 * for RC QP's during the RTR to RTS transition.
2157 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2158 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2161 * Set target->rq_tmo_jiffies to one second more than the largest time
2162 * it can take before an error completion is generated. See also
2163 * C9-140..142 in the IBTA spec for more information about how to
2164 * convert the QP Local ACK Timeout value to nanoseconds.
2166 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2167 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2168 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2169 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2171 return rq_tmo_jiffies;
2174 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2175 const struct srp_login_rsp *lrsp,
2176 struct srp_rdma_ch *ch)
2178 struct srp_target_port *target = ch->target;
2179 struct ib_qp_attr *qp_attr = NULL;
2184 if (lrsp->opcode == SRP_LOGIN_RSP) {
2185 ch->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2186 ch->req_lim = be32_to_cpu(lrsp->req_lim_delta);
2189 * Reserve credits for task management so we don't
2190 * bounce requests back to the SCSI mid-layer.
2192 target->scsi_host->can_queue
2193 = min(ch->req_lim - SRP_TSK_MGMT_SQ_SIZE,
2194 target->scsi_host->can_queue);
2195 target->scsi_host->cmd_per_lun
2196 = min_t(int, target->scsi_host->can_queue,
2197 target->scsi_host->cmd_per_lun);
2199 shost_printk(KERN_WARNING, target->scsi_host,
2200 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2206 ret = srp_alloc_iu_bufs(ch);
2212 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
2216 qp_attr->qp_state = IB_QPS_RTR;
2217 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2221 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
2225 for (i = 0; i < target->queue_size; i++) {
2226 struct srp_iu *iu = ch->rx_ring[i];
2228 ret = srp_post_recv(ch, iu);
2233 qp_attr->qp_state = IB_QPS_RTS;
2234 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2238 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2240 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
2244 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2253 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
2254 struct ib_cm_event *event,
2255 struct srp_rdma_ch *ch)
2257 struct srp_target_port *target = ch->target;
2258 struct Scsi_Host *shost = target->scsi_host;
2259 struct ib_class_port_info *cpi;
2262 switch (event->param.rej_rcvd.reason) {
2263 case IB_CM_REJ_PORT_CM_REDIRECT:
2264 cpi = event->param.rej_rcvd.ari;
2265 ch->path.dlid = cpi->redirect_lid;
2266 ch->path.pkey = cpi->redirect_pkey;
2267 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
2268 memcpy(ch->path.dgid.raw, cpi->redirect_gid, 16);
2270 ch->status = ch->path.dlid ?
2271 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2274 case IB_CM_REJ_PORT_REDIRECT:
2275 if (srp_target_is_topspin(target)) {
2277 * Topspin/Cisco SRP gateways incorrectly send
2278 * reject reason code 25 when they mean 24
2281 memcpy(ch->path.dgid.raw,
2282 event->param.rej_rcvd.ari, 16);
2284 shost_printk(KERN_DEBUG, shost,
2285 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2286 be64_to_cpu(ch->path.dgid.global.subnet_prefix),
2287 be64_to_cpu(ch->path.dgid.global.interface_id));
2289 ch->status = SRP_PORT_REDIRECT;
2291 shost_printk(KERN_WARNING, shost,
2292 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
2293 ch->status = -ECONNRESET;
2297 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
2298 shost_printk(KERN_WARNING, shost,
2299 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2300 ch->status = -ECONNRESET;
2303 case IB_CM_REJ_CONSUMER_DEFINED:
2304 opcode = *(u8 *) event->private_data;
2305 if (opcode == SRP_LOGIN_REJ) {
2306 struct srp_login_rej *rej = event->private_data;
2307 u32 reason = be32_to_cpu(rej->reason);
2309 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
2310 shost_printk(KERN_WARNING, shost,
2311 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2313 shost_printk(KERN_WARNING, shost, PFX
2314 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2316 target->orig_dgid.raw, reason);
2318 shost_printk(KERN_WARNING, shost,
2319 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2320 " opcode 0x%02x\n", opcode);
2321 ch->status = -ECONNRESET;
2324 case IB_CM_REJ_STALE_CONN:
2325 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
2326 ch->status = SRP_STALE_CONN;
2330 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2331 event->param.rej_rcvd.reason);
2332 ch->status = -ECONNRESET;
2336 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
2338 struct srp_rdma_ch *ch = cm_id->context;
2339 struct srp_target_port *target = ch->target;
2342 switch (event->event) {
2343 case IB_CM_REQ_ERROR:
2344 shost_printk(KERN_DEBUG, target->scsi_host,
2345 PFX "Sending CM REQ failed\n");
2347 ch->status = -ECONNRESET;
2350 case IB_CM_REP_RECEIVED:
2352 srp_cm_rep_handler(cm_id, event->private_data, ch);
2355 case IB_CM_REJ_RECEIVED:
2356 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
2359 srp_cm_rej_handler(cm_id, event, ch);
2362 case IB_CM_DREQ_RECEIVED:
2363 shost_printk(KERN_WARNING, target->scsi_host,
2364 PFX "DREQ received - connection closed\n");
2365 ch->connected = false;
2366 if (ib_send_cm_drep(cm_id, NULL, 0))
2367 shost_printk(KERN_ERR, target->scsi_host,
2368 PFX "Sending CM DREP failed\n");
2369 queue_work(system_long_wq, &target->tl_err_work);
2372 case IB_CM_TIMEWAIT_EXIT:
2373 shost_printk(KERN_ERR, target->scsi_host,
2374 PFX "connection closed\n");
2380 case IB_CM_MRA_RECEIVED:
2381 case IB_CM_DREQ_ERROR:
2382 case IB_CM_DREP_RECEIVED:
2386 shost_printk(KERN_WARNING, target->scsi_host,
2387 PFX "Unhandled CM event %d\n", event->event);
2392 complete(&ch->done);
2398 * srp_change_queue_depth - setting device queue depth
2399 * @sdev: scsi device struct
2400 * @qdepth: requested queue depth
2402 * Returns queue depth.
2405 srp_change_queue_depth(struct scsi_device *sdev, int qdepth)
2407 if (!sdev->tagged_supported)
2409 return scsi_change_queue_depth(sdev, qdepth);
2412 static int srp_send_tsk_mgmt(struct srp_rdma_ch *ch, u64 req_tag, u64 lun,
2415 struct srp_target_port *target = ch->target;
2416 struct srp_rport *rport = target->rport;
2417 struct ib_device *dev = target->srp_host->srp_dev->dev;
2419 struct srp_tsk_mgmt *tsk_mgmt;
2421 if (!ch->connected || target->qp_in_error)
2424 init_completion(&ch->tsk_mgmt_done);
2427 * Lock the rport mutex to avoid that srp_create_ch_ib() is
2428 * invoked while a task management function is being sent.
2430 mutex_lock(&rport->mutex);
2431 spin_lock_irq(&ch->lock);
2432 iu = __srp_get_tx_iu(ch, SRP_IU_TSK_MGMT);
2433 spin_unlock_irq(&ch->lock);
2436 mutex_unlock(&rport->mutex);
2441 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2444 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2446 tsk_mgmt->opcode = SRP_TSK_MGMT;
2447 int_to_scsilun(lun, &tsk_mgmt->lun);
2448 tsk_mgmt->tag = req_tag | SRP_TAG_TSK_MGMT;
2449 tsk_mgmt->tsk_mgmt_func = func;
2450 tsk_mgmt->task_tag = req_tag;
2452 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2454 if (srp_post_send(ch, iu, sizeof(*tsk_mgmt))) {
2455 srp_put_tx_iu(ch, iu, SRP_IU_TSK_MGMT);
2456 mutex_unlock(&rport->mutex);
2460 mutex_unlock(&rport->mutex);
2462 if (!wait_for_completion_timeout(&ch->tsk_mgmt_done,
2463 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
2469 static int srp_abort(struct scsi_cmnd *scmnd)
2471 struct srp_target_port *target = host_to_target(scmnd->device->host);
2472 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2475 struct srp_rdma_ch *ch;
2478 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
2482 tag = blk_mq_unique_tag(scmnd->request);
2483 ch_idx = blk_mq_unique_tag_to_hwq(tag);
2484 if (WARN_ON_ONCE(ch_idx >= target->ch_count))
2486 ch = &target->ch[ch_idx];
2487 if (!srp_claim_req(ch, req, NULL, scmnd))
2489 shost_printk(KERN_ERR, target->scsi_host,
2490 "Sending SRP abort for tag %#x\n", tag);
2491 if (srp_send_tsk_mgmt(ch, tag, scmnd->device->lun,
2492 SRP_TSK_ABORT_TASK) == 0)
2494 else if (target->rport->state == SRP_RPORT_LOST)
2498 srp_free_req(ch, req, scmnd, 0);
2499 scmnd->result = DID_ABORT << 16;
2500 scmnd->scsi_done(scmnd);
2505 static int srp_reset_device(struct scsi_cmnd *scmnd)
2507 struct srp_target_port *target = host_to_target(scmnd->device->host);
2508 struct srp_rdma_ch *ch;
2511 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
2513 ch = &target->ch[0];
2514 if (srp_send_tsk_mgmt(ch, SRP_TAG_NO_REQ, scmnd->device->lun,
2517 if (ch->tsk_mgmt_status)
2520 for (i = 0; i < target->ch_count; i++) {
2521 ch = &target->ch[i];
2522 for (i = 0; i < target->req_ring_size; ++i) {
2523 struct srp_request *req = &ch->req_ring[i];
2525 srp_finish_req(ch, req, scmnd->device, DID_RESET << 16);
2532 static int srp_reset_host(struct scsi_cmnd *scmnd)
2534 struct srp_target_port *target = host_to_target(scmnd->device->host);
2536 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
2538 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
2541 static int srp_slave_configure(struct scsi_device *sdev)
2543 struct Scsi_Host *shost = sdev->host;
2544 struct srp_target_port *target = host_to_target(shost);
2545 struct request_queue *q = sdev->request_queue;
2546 unsigned long timeout;
2548 if (sdev->type == TYPE_DISK) {
2549 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
2550 blk_queue_rq_timeout(q, timeout);
2556 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
2559 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2561 return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->id_ext));
2564 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
2567 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2569 return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->ioc_guid));
2572 static ssize_t show_service_id(struct device *dev,
2573 struct device_attribute *attr, char *buf)
2575 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2577 return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->service_id));
2580 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
2583 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2585 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->pkey));
2588 static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
2591 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2593 return sprintf(buf, "%pI6\n", target->sgid.raw);
2596 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
2599 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2600 struct srp_rdma_ch *ch = &target->ch[0];
2602 return sprintf(buf, "%pI6\n", ch->path.dgid.raw);
2605 static ssize_t show_orig_dgid(struct device *dev,
2606 struct device_attribute *attr, char *buf)
2608 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2610 return sprintf(buf, "%pI6\n", target->orig_dgid.raw);
2613 static ssize_t show_req_lim(struct device *dev,
2614 struct device_attribute *attr, char *buf)
2616 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2617 struct srp_rdma_ch *ch;
2618 int i, req_lim = INT_MAX;
2620 for (i = 0; i < target->ch_count; i++) {
2621 ch = &target->ch[i];
2622 req_lim = min(req_lim, ch->req_lim);
2624 return sprintf(buf, "%d\n", req_lim);
2627 static ssize_t show_zero_req_lim(struct device *dev,
2628 struct device_attribute *attr, char *buf)
2630 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2632 return sprintf(buf, "%d\n", target->zero_req_lim);
2635 static ssize_t show_local_ib_port(struct device *dev,
2636 struct device_attribute *attr, char *buf)
2638 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2640 return sprintf(buf, "%d\n", target->srp_host->port);
2643 static ssize_t show_local_ib_device(struct device *dev,
2644 struct device_attribute *attr, char *buf)
2646 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2648 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
2651 static ssize_t show_ch_count(struct device *dev, struct device_attribute *attr,
2654 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2656 return sprintf(buf, "%d\n", target->ch_count);
2659 static ssize_t show_comp_vector(struct device *dev,
2660 struct device_attribute *attr, char *buf)
2662 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2664 return sprintf(buf, "%d\n", target->comp_vector);
2667 static ssize_t show_tl_retry_count(struct device *dev,
2668 struct device_attribute *attr, char *buf)
2670 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2672 return sprintf(buf, "%d\n", target->tl_retry_count);
2675 static ssize_t show_cmd_sg_entries(struct device *dev,
2676 struct device_attribute *attr, char *buf)
2678 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2680 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
2683 static ssize_t show_allow_ext_sg(struct device *dev,
2684 struct device_attribute *attr, char *buf)
2686 struct srp_target_port *target = host_to_target(class_to_shost(dev));
2688 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
2691 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
2692 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
2693 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
2694 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2695 static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
2696 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
2697 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
2698 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
2699 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
2700 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
2701 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
2702 static DEVICE_ATTR(ch_count, S_IRUGO, show_ch_count, NULL);
2703 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
2704 static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
2705 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
2706 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
2708 static struct device_attribute *srp_host_attrs[] = {
2711 &dev_attr_service_id,
2715 &dev_attr_orig_dgid,
2717 &dev_attr_zero_req_lim,
2718 &dev_attr_local_ib_port,
2719 &dev_attr_local_ib_device,
2721 &dev_attr_comp_vector,
2722 &dev_attr_tl_retry_count,
2723 &dev_attr_cmd_sg_entries,
2724 &dev_attr_allow_ext_sg,
2728 static struct scsi_host_template srp_template = {
2729 .module = THIS_MODULE,
2730 .name = "InfiniBand SRP initiator",
2731 .proc_name = DRV_NAME,
2732 .slave_configure = srp_slave_configure,
2733 .info = srp_target_info,
2734 .queuecommand = srp_queuecommand,
2735 .change_queue_depth = srp_change_queue_depth,
2736 .eh_abort_handler = srp_abort,
2737 .eh_device_reset_handler = srp_reset_device,
2738 .eh_host_reset_handler = srp_reset_host,
2739 .skip_settle_delay = true,
2740 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
2741 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
2743 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
2744 .use_clustering = ENABLE_CLUSTERING,
2745 .shost_attrs = srp_host_attrs,
2747 .track_queue_depth = 1,
2750 static int srp_sdev_count(struct Scsi_Host *host)
2752 struct scsi_device *sdev;
2755 shost_for_each_device(sdev, host)
2761 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
2763 struct srp_rport_identifiers ids;
2764 struct srp_rport *rport;
2766 target->state = SRP_TARGET_SCANNING;
2767 sprintf(target->target_name, "SRP.T10:%016llX",
2768 be64_to_cpu(target->id_ext));
2770 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
2773 memcpy(ids.port_id, &target->id_ext, 8);
2774 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
2775 ids.roles = SRP_RPORT_ROLE_TARGET;
2776 rport = srp_rport_add(target->scsi_host, &ids);
2777 if (IS_ERR(rport)) {
2778 scsi_remove_host(target->scsi_host);
2779 return PTR_ERR(rport);
2782 rport->lld_data = target;
2783 target->rport = rport;
2785 spin_lock(&host->target_lock);
2786 list_add_tail(&target->list, &host->target_list);
2787 spin_unlock(&host->target_lock);
2789 scsi_scan_target(&target->scsi_host->shost_gendev,
2790 0, target->scsi_id, SCAN_WILD_CARD, 0);
2792 if (srp_connected_ch(target) < target->ch_count ||
2793 target->qp_in_error) {
2794 shost_printk(KERN_INFO, target->scsi_host,
2795 PFX "SCSI scan failed - removing SCSI host\n");
2796 srp_queue_remove_work(target);
2800 pr_debug(PFX "%s: SCSI scan succeeded - detected %d LUNs\n",
2801 dev_name(&target->scsi_host->shost_gendev),
2802 srp_sdev_count(target->scsi_host));
2804 spin_lock_irq(&target->lock);
2805 if (target->state == SRP_TARGET_SCANNING)
2806 target->state = SRP_TARGET_LIVE;
2807 spin_unlock_irq(&target->lock);
2813 static void srp_release_dev(struct device *dev)
2815 struct srp_host *host =
2816 container_of(dev, struct srp_host, dev);
2818 complete(&host->released);
2821 static struct class srp_class = {
2822 .name = "infiniband_srp",
2823 .dev_release = srp_release_dev
2827 * srp_conn_unique() - check whether the connection to a target is unique
2829 * @target: SRP target port.
2831 static bool srp_conn_unique(struct srp_host *host,
2832 struct srp_target_port *target)
2834 struct srp_target_port *t;
2837 if (target->state == SRP_TARGET_REMOVED)
2842 spin_lock(&host->target_lock);
2843 list_for_each_entry(t, &host->target_list, list) {
2845 target->id_ext == t->id_ext &&
2846 target->ioc_guid == t->ioc_guid &&
2847 target->initiator_ext == t->initiator_ext) {
2852 spin_unlock(&host->target_lock);
2859 * Target ports are added by writing
2861 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
2862 * pkey=<P_Key>,service_id=<service ID>
2864 * to the add_target sysfs attribute.
2868 SRP_OPT_ID_EXT = 1 << 0,
2869 SRP_OPT_IOC_GUID = 1 << 1,
2870 SRP_OPT_DGID = 1 << 2,
2871 SRP_OPT_PKEY = 1 << 3,
2872 SRP_OPT_SERVICE_ID = 1 << 4,
2873 SRP_OPT_MAX_SECT = 1 << 5,
2874 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
2875 SRP_OPT_IO_CLASS = 1 << 7,
2876 SRP_OPT_INITIATOR_EXT = 1 << 8,
2877 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
2878 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
2879 SRP_OPT_SG_TABLESIZE = 1 << 11,
2880 SRP_OPT_COMP_VECTOR = 1 << 12,
2881 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
2882 SRP_OPT_QUEUE_SIZE = 1 << 14,
2883 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
2887 SRP_OPT_SERVICE_ID),
2890 static const match_table_t srp_opt_tokens = {
2891 { SRP_OPT_ID_EXT, "id_ext=%s" },
2892 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
2893 { SRP_OPT_DGID, "dgid=%s" },
2894 { SRP_OPT_PKEY, "pkey=%x" },
2895 { SRP_OPT_SERVICE_ID, "service_id=%s" },
2896 { SRP_OPT_MAX_SECT, "max_sect=%d" },
2897 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
2898 { SRP_OPT_IO_CLASS, "io_class=%x" },
2899 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
2900 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
2901 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
2902 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
2903 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
2904 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
2905 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
2906 { SRP_OPT_ERR, NULL }
2909 static int srp_parse_options(const char *buf, struct srp_target_port *target)
2911 char *options, *sep_opt;
2914 substring_t args[MAX_OPT_ARGS];
2920 options = kstrdup(buf, GFP_KERNEL);
2925 while ((p = strsep(&sep_opt, ",\n")) != NULL) {
2929 token = match_token(p, srp_opt_tokens, args);
2933 case SRP_OPT_ID_EXT:
2934 p = match_strdup(args);
2939 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
2943 case SRP_OPT_IOC_GUID:
2944 p = match_strdup(args);
2949 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
2954 p = match_strdup(args);
2959 if (strlen(p) != 32) {
2960 pr_warn("bad dest GID parameter '%s'\n", p);
2965 for (i = 0; i < 16; ++i) {
2966 strlcpy(dgid, p + i * 2, sizeof(dgid));
2967 if (sscanf(dgid, "%hhx",
2968 &target->orig_dgid.raw[i]) < 1) {
2978 if (match_hex(args, &token)) {
2979 pr_warn("bad P_Key parameter '%s'\n", p);
2982 target->pkey = cpu_to_be16(token);
2985 case SRP_OPT_SERVICE_ID:
2986 p = match_strdup(args);
2991 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
2995 case SRP_OPT_MAX_SECT:
2996 if (match_int(args, &token)) {
2997 pr_warn("bad max sect parameter '%s'\n", p);
3000 target->scsi_host->max_sectors = token;
3003 case SRP_OPT_QUEUE_SIZE:
3004 if (match_int(args, &token) || token < 1) {
3005 pr_warn("bad queue_size parameter '%s'\n", p);
3008 target->scsi_host->can_queue = token;
3009 target->queue_size = token + SRP_RSP_SQ_SIZE +
3010 SRP_TSK_MGMT_SQ_SIZE;
3011 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
3012 target->scsi_host->cmd_per_lun = token;
3015 case SRP_OPT_MAX_CMD_PER_LUN:
3016 if (match_int(args, &token) || token < 1) {
3017 pr_warn("bad max cmd_per_lun parameter '%s'\n",
3021 target->scsi_host->cmd_per_lun = token;
3024 case SRP_OPT_IO_CLASS:
3025 if (match_hex(args, &token)) {
3026 pr_warn("bad IO class parameter '%s'\n", p);
3029 if (token != SRP_REV10_IB_IO_CLASS &&
3030 token != SRP_REV16A_IB_IO_CLASS) {
3031 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
3032 token, SRP_REV10_IB_IO_CLASS,
3033 SRP_REV16A_IB_IO_CLASS);
3036 target->io_class = token;
3039 case SRP_OPT_INITIATOR_EXT:
3040 p = match_strdup(args);
3045 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
3049 case SRP_OPT_CMD_SG_ENTRIES:
3050 if (match_int(args, &token) || token < 1 || token > 255) {
3051 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
3055 target->cmd_sg_cnt = token;
3058 case SRP_OPT_ALLOW_EXT_SG:
3059 if (match_int(args, &token)) {
3060 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
3063 target->allow_ext_sg = !!token;
3066 case SRP_OPT_SG_TABLESIZE:
3067 if (match_int(args, &token) || token < 1 ||
3068 token > SCSI_MAX_SG_CHAIN_SEGMENTS) {
3069 pr_warn("bad max sg_tablesize parameter '%s'\n",
3073 target->sg_tablesize = token;
3076 case SRP_OPT_COMP_VECTOR:
3077 if (match_int(args, &token) || token < 0) {
3078 pr_warn("bad comp_vector parameter '%s'\n", p);
3081 target->comp_vector = token;
3084 case SRP_OPT_TL_RETRY_COUNT:
3085 if (match_int(args, &token) || token < 2 || token > 7) {
3086 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
3090 target->tl_retry_count = token;
3094 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
3100 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
3103 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
3104 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
3105 !(srp_opt_tokens[i].token & opt_mask))
3106 pr_warn("target creation request is missing parameter '%s'\n",
3107 srp_opt_tokens[i].pattern);
3109 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
3110 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
3111 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
3112 target->scsi_host->cmd_per_lun,
3113 target->scsi_host->can_queue);
3120 static ssize_t srp_create_target(struct device *dev,
3121 struct device_attribute *attr,
3122 const char *buf, size_t count)
3124 struct srp_host *host =
3125 container_of(dev, struct srp_host, dev);
3126 struct Scsi_Host *target_host;
3127 struct srp_target_port *target;
3128 struct srp_rdma_ch *ch;
3129 struct srp_device *srp_dev = host->srp_dev;
3130 struct ib_device *ibdev = srp_dev->dev;
3131 int ret, node_idx, node, cpu, i;
3132 bool multich = false;
3134 target_host = scsi_host_alloc(&srp_template,
3135 sizeof (struct srp_target_port));
3139 target_host->transportt = ib_srp_transport_template;
3140 target_host->max_channel = 0;
3141 target_host->max_id = 1;
3142 target_host->max_lun = -1LL;
3143 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
3145 target = host_to_target(target_host);
3147 target->io_class = SRP_REV16A_IB_IO_CLASS;
3148 target->scsi_host = target_host;
3149 target->srp_host = host;
3150 target->lkey = host->srp_dev->mr->lkey;
3151 target->rkey = host->srp_dev->mr->rkey;
3152 target->cmd_sg_cnt = cmd_sg_entries;
3153 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
3154 target->allow_ext_sg = allow_ext_sg;
3155 target->tl_retry_count = 7;
3156 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
3159 * Avoid that the SCSI host can be removed by srp_remove_target()
3160 * before this function returns.
3162 scsi_host_get(target->scsi_host);
3164 mutex_lock(&host->add_target_mutex);
3166 ret = srp_parse_options(buf, target);
3170 ret = scsi_init_shared_tag_map(target_host, target_host->can_queue);
3174 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
3176 if (!srp_conn_unique(target->srp_host, target)) {
3177 shost_printk(KERN_INFO, target->scsi_host,
3178 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3179 be64_to_cpu(target->id_ext),
3180 be64_to_cpu(target->ioc_guid),
3181 be64_to_cpu(target->initiator_ext));
3186 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
3187 target->cmd_sg_cnt < target->sg_tablesize) {
3188 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
3189 target->sg_tablesize = target->cmd_sg_cnt;
3192 target_host->sg_tablesize = target->sg_tablesize;
3193 target->indirect_size = target->sg_tablesize *
3194 sizeof (struct srp_direct_buf);
3195 target->max_iu_len = sizeof (struct srp_cmd) +
3196 sizeof (struct srp_indirect_buf) +
3197 target->cmd_sg_cnt * sizeof (struct srp_direct_buf);
3199 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
3200 INIT_WORK(&target->remove_work, srp_remove_work);
3201 spin_lock_init(&target->lock);
3202 ret = ib_query_gid(ibdev, host->port, 0, &target->sgid);
3207 target->ch_count = max_t(unsigned, num_online_nodes(),
3209 min(4 * num_online_nodes(),
3210 ibdev->num_comp_vectors),
3211 num_online_cpus()));
3212 target->ch = kcalloc(target->ch_count, sizeof(*target->ch),
3218 for_each_online_node(node) {
3219 const int ch_start = (node_idx * target->ch_count /
3220 num_online_nodes());
3221 const int ch_end = ((node_idx + 1) * target->ch_count /
3222 num_online_nodes());
3223 const int cv_start = (node_idx * ibdev->num_comp_vectors /
3224 num_online_nodes() + target->comp_vector)
3225 % ibdev->num_comp_vectors;
3226 const int cv_end = ((node_idx + 1) * ibdev->num_comp_vectors /
3227 num_online_nodes() + target->comp_vector)
3228 % ibdev->num_comp_vectors;
3231 for_each_online_cpu(cpu) {
3232 if (cpu_to_node(cpu) != node)
3234 if (ch_start + cpu_idx >= ch_end)
3236 ch = &target->ch[ch_start + cpu_idx];
3237 ch->target = target;
3238 ch->comp_vector = cv_start == cv_end ? cv_start :
3239 cv_start + cpu_idx % (cv_end - cv_start);
3240 spin_lock_init(&ch->lock);
3241 INIT_LIST_HEAD(&ch->free_tx);
3242 ret = srp_new_cm_id(ch);
3244 goto err_disconnect;
3246 ret = srp_create_ch_ib(ch);
3248 goto err_disconnect;
3250 ret = srp_alloc_req_data(ch);
3252 goto err_disconnect;
3254 ret = srp_connect_ch(ch, multich);
3256 shost_printk(KERN_ERR, target->scsi_host,
3257 PFX "Connection %d/%d failed\n",
3260 if (node_idx == 0 && cpu_idx == 0) {
3261 goto err_disconnect;
3263 srp_free_ch_ib(target, ch);
3264 srp_free_req_data(target, ch);
3265 target->ch_count = ch - target->ch;
3276 target->scsi_host->nr_hw_queues = target->ch_count;
3278 ret = srp_add_target(host, target);
3280 goto err_disconnect;
3282 if (target->state != SRP_TARGET_REMOVED) {
3283 shost_printk(KERN_DEBUG, target->scsi_host, PFX
3284 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
3285 be64_to_cpu(target->id_ext),
3286 be64_to_cpu(target->ioc_guid),
3287 be16_to_cpu(target->pkey),
3288 be64_to_cpu(target->service_id),
3289 target->sgid.raw, target->orig_dgid.raw);
3295 mutex_unlock(&host->add_target_mutex);
3297 scsi_host_put(target->scsi_host);
3302 srp_disconnect_target(target);
3304 for (i = 0; i < target->ch_count; i++) {
3305 ch = &target->ch[i];
3306 srp_free_ch_ib(target, ch);
3307 srp_free_req_data(target, ch);
3314 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
3316 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
3319 struct srp_host *host = container_of(dev, struct srp_host, dev);
3321 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
3324 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
3326 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
3329 struct srp_host *host = container_of(dev, struct srp_host, dev);
3331 return sprintf(buf, "%d\n", host->port);
3334 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
3336 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
3338 struct srp_host *host;
3340 host = kzalloc(sizeof *host, GFP_KERNEL);
3344 INIT_LIST_HEAD(&host->target_list);
3345 spin_lock_init(&host->target_lock);
3346 init_completion(&host->released);
3347 mutex_init(&host->add_target_mutex);
3348 host->srp_dev = device;
3351 host->dev.class = &srp_class;
3352 host->dev.parent = device->dev->dma_device;
3353 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
3355 if (device_register(&host->dev))
3357 if (device_create_file(&host->dev, &dev_attr_add_target))
3359 if (device_create_file(&host->dev, &dev_attr_ibdev))
3361 if (device_create_file(&host->dev, &dev_attr_port))
3367 device_unregister(&host->dev);
3375 static void srp_add_one(struct ib_device *device)
3377 struct srp_device *srp_dev;
3378 struct ib_device_attr *dev_attr;
3379 struct srp_host *host;
3380 int mr_page_shift, p;
3381 u64 max_pages_per_mr;
3383 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
3387 if (ib_query_device(device, dev_attr)) {
3388 pr_warn("Query device failed for %s\n", device->name);
3392 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
3396 srp_dev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
3397 device->map_phys_fmr && device->unmap_fmr);
3398 srp_dev->has_fr = (dev_attr->device_cap_flags &
3399 IB_DEVICE_MEM_MGT_EXTENSIONS);
3400 if (!srp_dev->has_fmr && !srp_dev->has_fr)
3401 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
3403 srp_dev->use_fast_reg = (srp_dev->has_fr &&
3404 (!srp_dev->has_fmr || prefer_fr));
3407 * Use the smallest page size supported by the HCA, down to a
3408 * minimum of 4096 bytes. We're unlikely to build large sglists
3409 * out of smaller entries.
3411 mr_page_shift = max(12, ffs(dev_attr->page_size_cap) - 1);
3412 srp_dev->mr_page_size = 1 << mr_page_shift;
3413 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
3414 max_pages_per_mr = dev_attr->max_mr_size;
3415 do_div(max_pages_per_mr, srp_dev->mr_page_size);
3416 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
3418 if (srp_dev->use_fast_reg) {
3419 srp_dev->max_pages_per_mr =
3420 min_t(u32, srp_dev->max_pages_per_mr,
3421 dev_attr->max_fast_reg_page_list_len);
3423 srp_dev->mr_max_size = srp_dev->mr_page_size *
3424 srp_dev->max_pages_per_mr;
3425 pr_debug("%s: mr_page_shift = %d, dev_attr->max_mr_size = %#llx, dev_attr->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
3426 device->name, mr_page_shift, dev_attr->max_mr_size,
3427 dev_attr->max_fast_reg_page_list_len,
3428 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
3430 INIT_LIST_HEAD(&srp_dev->dev_list);
3432 srp_dev->dev = device;
3433 srp_dev->pd = ib_alloc_pd(device);
3434 if (IS_ERR(srp_dev->pd))
3437 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
3438 IB_ACCESS_LOCAL_WRITE |
3439 IB_ACCESS_REMOTE_READ |
3440 IB_ACCESS_REMOTE_WRITE);
3441 if (IS_ERR(srp_dev->mr))
3444 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
3445 host = srp_add_port(srp_dev, p);
3447 list_add_tail(&host->list, &srp_dev->dev_list);
3450 ib_set_client_data(device, &srp_client, srp_dev);
3455 ib_dealloc_pd(srp_dev->pd);
3464 static void srp_remove_one(struct ib_device *device, void *client_data)
3466 struct srp_device *srp_dev;
3467 struct srp_host *host, *tmp_host;
3468 struct srp_target_port *target;
3470 srp_dev = client_data;
3474 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
3475 device_unregister(&host->dev);
3477 * Wait for the sysfs entry to go away, so that no new
3478 * target ports can be created.
3480 wait_for_completion(&host->released);
3483 * Remove all target ports.
3485 spin_lock(&host->target_lock);
3486 list_for_each_entry(target, &host->target_list, list)
3487 srp_queue_remove_work(target);
3488 spin_unlock(&host->target_lock);
3491 * Wait for tl_err and target port removal tasks.
3493 flush_workqueue(system_long_wq);
3494 flush_workqueue(srp_remove_wq);
3499 ib_dereg_mr(srp_dev->mr);
3500 ib_dealloc_pd(srp_dev->pd);
3505 static struct srp_function_template ib_srp_transport_functions = {
3506 .has_rport_state = true,
3507 .reset_timer_if_blocked = true,
3508 .reconnect_delay = &srp_reconnect_delay,
3509 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
3510 .dev_loss_tmo = &srp_dev_loss_tmo,
3511 .reconnect = srp_rport_reconnect,
3512 .rport_delete = srp_rport_delete,
3513 .terminate_rport_io = srp_terminate_io,
3516 static int __init srp_init_module(void)
3520 BUILD_BUG_ON(FIELD_SIZEOF(struct ib_wc, wr_id) < sizeof(void *));
3522 if (srp_sg_tablesize) {
3523 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
3524 if (!cmd_sg_entries)
3525 cmd_sg_entries = srp_sg_tablesize;
3528 if (!cmd_sg_entries)
3529 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
3531 if (cmd_sg_entries > 255) {
3532 pr_warn("Clamping cmd_sg_entries to 255\n");
3533 cmd_sg_entries = 255;
3536 if (!indirect_sg_entries)
3537 indirect_sg_entries = cmd_sg_entries;
3538 else if (indirect_sg_entries < cmd_sg_entries) {
3539 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
3541 indirect_sg_entries = cmd_sg_entries;
3544 srp_remove_wq = create_workqueue("srp_remove");
3545 if (!srp_remove_wq) {
3551 ib_srp_transport_template =
3552 srp_attach_transport(&ib_srp_transport_functions);
3553 if (!ib_srp_transport_template)
3556 ret = class_register(&srp_class);
3558 pr_err("couldn't register class infiniband_srp\n");
3562 ib_sa_register_client(&srp_sa_client);
3564 ret = ib_register_client(&srp_client);
3566 pr_err("couldn't register IB client\n");
3574 ib_sa_unregister_client(&srp_sa_client);
3575 class_unregister(&srp_class);
3578 srp_release_transport(ib_srp_transport_template);
3581 destroy_workqueue(srp_remove_wq);
3585 static void __exit srp_cleanup_module(void)
3587 ib_unregister_client(&srp_client);
3588 ib_sa_unregister_client(&srp_sa_client);
3589 class_unregister(&srp_class);
3590 srp_release_transport(ib_srp_transport_template);
3591 destroy_workqueue(srp_remove_wq);
3594 module_init(srp_init_module);
3595 module_exit(srp_cleanup_module);