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 <linux/lockdep.h>
44 #include <linux/inet.h>
45 #include <rdma/ib_cache.h>
47 #include <linux/atomic.h>
49 #include <scsi/scsi.h>
50 #include <scsi/scsi_device.h>
51 #include <scsi/scsi_dbg.h>
52 #include <scsi/scsi_tcq.h>
54 #include <scsi/scsi_transport_srp.h>
58 #define DRV_NAME "ib_srp"
59 #define PFX DRV_NAME ": "
61 MODULE_AUTHOR("Roland Dreier");
62 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator");
63 MODULE_LICENSE("Dual BSD/GPL");
65 #if !defined(CONFIG_DYNAMIC_DEBUG)
66 #define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt)
67 #define DYNAMIC_DEBUG_BRANCH(descriptor) false
70 static unsigned int srp_sg_tablesize;
71 static unsigned int cmd_sg_entries;
72 static unsigned int indirect_sg_entries;
73 static bool allow_ext_sg;
74 static bool prefer_fr = true;
75 static bool register_always = true;
76 static bool never_register;
77 static int topspin_workarounds = 1;
79 module_param(srp_sg_tablesize, uint, 0444);
80 MODULE_PARM_DESC(srp_sg_tablesize, "Deprecated name for cmd_sg_entries");
82 module_param(cmd_sg_entries, uint, 0444);
83 MODULE_PARM_DESC(cmd_sg_entries,
84 "Default number of gather/scatter entries in the SRP command (default is 12, max 255)");
86 module_param(indirect_sg_entries, uint, 0444);
87 MODULE_PARM_DESC(indirect_sg_entries,
88 "Default max number of gather/scatter entries (default is 12, max is " __stringify(SG_MAX_SEGMENTS) ")");
90 module_param(allow_ext_sg, bool, 0444);
91 MODULE_PARM_DESC(allow_ext_sg,
92 "Default behavior when there are more than cmd_sg_entries S/G entries after mapping; fails the request when false (default false)");
94 module_param(topspin_workarounds, int, 0444);
95 MODULE_PARM_DESC(topspin_workarounds,
96 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
98 module_param(prefer_fr, bool, 0444);
99 MODULE_PARM_DESC(prefer_fr,
100 "Whether to use fast registration if both FMR and fast registration are supported");
102 module_param(register_always, bool, 0444);
103 MODULE_PARM_DESC(register_always,
104 "Use memory registration even for contiguous memory regions");
106 module_param(never_register, bool, 0444);
107 MODULE_PARM_DESC(never_register, "Never register memory");
109 static const struct kernel_param_ops srp_tmo_ops;
111 static int srp_reconnect_delay = 10;
112 module_param_cb(reconnect_delay, &srp_tmo_ops, &srp_reconnect_delay,
114 MODULE_PARM_DESC(reconnect_delay, "Time between successive reconnect attempts");
116 static int srp_fast_io_fail_tmo = 15;
117 module_param_cb(fast_io_fail_tmo, &srp_tmo_ops, &srp_fast_io_fail_tmo,
119 MODULE_PARM_DESC(fast_io_fail_tmo,
120 "Number of seconds between the observation of a transport"
121 " layer error and failing all I/O. \"off\" means that this"
122 " functionality is disabled.");
124 static int srp_dev_loss_tmo = 600;
125 module_param_cb(dev_loss_tmo, &srp_tmo_ops, &srp_dev_loss_tmo,
127 MODULE_PARM_DESC(dev_loss_tmo,
128 "Maximum number of seconds that the SRP transport should"
129 " insulate transport layer errors. After this time has been"
130 " exceeded the SCSI host is removed. Should be"
131 " between 1 and " __stringify(SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
132 " if fast_io_fail_tmo has not been set. \"off\" means that"
133 " this functionality is disabled.");
135 static bool srp_use_imm_data = true;
136 module_param_named(use_imm_data, srp_use_imm_data, bool, 0644);
137 MODULE_PARM_DESC(use_imm_data,
138 "Whether or not to request permission to use immediate data during SRP login.");
140 static unsigned int srp_max_imm_data = 8 * 1024;
141 module_param_named(max_imm_data, srp_max_imm_data, uint, 0644);
142 MODULE_PARM_DESC(max_imm_data, "Maximum immediate data size.");
144 static unsigned ch_count;
145 module_param(ch_count, uint, 0444);
146 MODULE_PARM_DESC(ch_count,
147 "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.");
149 static void srp_add_one(struct ib_device *device);
150 static void srp_remove_one(struct ib_device *device, void *client_data);
151 static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc);
152 static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
154 static int srp_ib_cm_handler(struct ib_cm_id *cm_id,
155 const struct ib_cm_event *event);
156 static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,
157 struct rdma_cm_event *event);
159 static struct scsi_transport_template *ib_srp_transport_template;
160 static struct workqueue_struct *srp_remove_wq;
162 static struct ib_client srp_client = {
165 .remove = srp_remove_one
168 static struct ib_sa_client srp_sa_client;
170 static int srp_tmo_get(char *buffer, const struct kernel_param *kp)
172 int tmo = *(int *)kp->arg;
175 return sprintf(buffer, "%d", tmo);
177 return sprintf(buffer, "off");
180 static int srp_tmo_set(const char *val, const struct kernel_param *kp)
184 res = srp_parse_tmo(&tmo, val);
188 if (kp->arg == &srp_reconnect_delay)
189 res = srp_tmo_valid(tmo, srp_fast_io_fail_tmo,
191 else if (kp->arg == &srp_fast_io_fail_tmo)
192 res = srp_tmo_valid(srp_reconnect_delay, tmo, srp_dev_loss_tmo);
194 res = srp_tmo_valid(srp_reconnect_delay, srp_fast_io_fail_tmo,
198 *(int *)kp->arg = tmo;
204 static const struct kernel_param_ops srp_tmo_ops = {
209 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
211 return (struct srp_target_port *) host->hostdata;
214 static const char *srp_target_info(struct Scsi_Host *host)
216 return host_to_target(host)->target_name;
219 static int srp_target_is_topspin(struct srp_target_port *target)
221 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
222 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
224 return topspin_workarounds &&
225 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
226 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
229 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
231 enum dma_data_direction direction)
235 iu = kmalloc(sizeof *iu, gfp_mask);
239 iu->buf = kzalloc(size, gfp_mask);
243 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
245 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
249 iu->direction = direction;
261 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
266 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
272 static void srp_qp_event(struct ib_event *event, void *context)
274 pr_debug("QP event %s (%d)\n",
275 ib_event_msg(event->event), event->event);
278 static int srp_init_ib_qp(struct srp_target_port *target,
281 struct ib_qp_attr *attr;
284 attr = kmalloc(sizeof *attr, GFP_KERNEL);
288 ret = ib_find_cached_pkey(target->srp_host->srp_dev->dev,
289 target->srp_host->port,
290 be16_to_cpu(target->ib_cm.pkey),
295 attr->qp_state = IB_QPS_INIT;
296 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
297 IB_ACCESS_REMOTE_WRITE);
298 attr->port_num = target->srp_host->port;
300 ret = ib_modify_qp(qp, attr,
311 static int srp_new_ib_cm_id(struct srp_rdma_ch *ch)
313 struct srp_target_port *target = ch->target;
314 struct ib_cm_id *new_cm_id;
316 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
317 srp_ib_cm_handler, ch);
318 if (IS_ERR(new_cm_id))
319 return PTR_ERR(new_cm_id);
322 ib_destroy_cm_id(ch->ib_cm.cm_id);
323 ch->ib_cm.cm_id = new_cm_id;
324 if (rdma_cap_opa_ah(target->srp_host->srp_dev->dev,
325 target->srp_host->port))
326 ch->ib_cm.path.rec_type = SA_PATH_REC_TYPE_OPA;
328 ch->ib_cm.path.rec_type = SA_PATH_REC_TYPE_IB;
329 ch->ib_cm.path.sgid = target->sgid;
330 ch->ib_cm.path.dgid = target->ib_cm.orig_dgid;
331 ch->ib_cm.path.pkey = target->ib_cm.pkey;
332 ch->ib_cm.path.service_id = target->ib_cm.service_id;
337 static int srp_new_rdma_cm_id(struct srp_rdma_ch *ch)
339 struct srp_target_port *target = ch->target;
340 struct rdma_cm_id *new_cm_id;
343 new_cm_id = rdma_create_id(target->net, srp_rdma_cm_handler, ch,
344 RDMA_PS_TCP, IB_QPT_RC);
345 if (IS_ERR(new_cm_id)) {
346 ret = PTR_ERR(new_cm_id);
351 init_completion(&ch->done);
352 ret = rdma_resolve_addr(new_cm_id, target->rdma_cm.src_specified ?
353 (struct sockaddr *)&target->rdma_cm.src : NULL,
354 (struct sockaddr *)&target->rdma_cm.dst,
355 SRP_PATH_REC_TIMEOUT_MS);
357 pr_err("No route available from %pIS to %pIS (%d)\n",
358 &target->rdma_cm.src, &target->rdma_cm.dst, ret);
361 ret = wait_for_completion_interruptible(&ch->done);
367 pr_err("Resolving address %pIS failed (%d)\n",
368 &target->rdma_cm.dst, ret);
372 swap(ch->rdma_cm.cm_id, new_cm_id);
376 rdma_destroy_id(new_cm_id);
381 static int srp_new_cm_id(struct srp_rdma_ch *ch)
383 struct srp_target_port *target = ch->target;
385 return target->using_rdma_cm ? srp_new_rdma_cm_id(ch) :
386 srp_new_ib_cm_id(ch);
389 static struct ib_fmr_pool *srp_alloc_fmr_pool(struct srp_target_port *target)
391 struct srp_device *dev = target->srp_host->srp_dev;
392 struct ib_fmr_pool_param fmr_param;
394 memset(&fmr_param, 0, sizeof(fmr_param));
395 fmr_param.pool_size = target->mr_pool_size;
396 fmr_param.dirty_watermark = fmr_param.pool_size / 4;
398 fmr_param.max_pages_per_fmr = dev->max_pages_per_mr;
399 fmr_param.page_shift = ilog2(dev->mr_page_size);
400 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
401 IB_ACCESS_REMOTE_WRITE |
402 IB_ACCESS_REMOTE_READ);
404 return ib_create_fmr_pool(dev->pd, &fmr_param);
408 * srp_destroy_fr_pool() - free the resources owned by a pool
409 * @pool: Fast registration pool to be destroyed.
411 static void srp_destroy_fr_pool(struct srp_fr_pool *pool)
414 struct srp_fr_desc *d;
419 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
427 * srp_create_fr_pool() - allocate and initialize a pool for fast registration
428 * @device: IB device to allocate fast registration descriptors for.
429 * @pd: Protection domain associated with the FR descriptors.
430 * @pool_size: Number of descriptors to allocate.
431 * @max_page_list_len: Maximum fast registration work request page list length.
433 static struct srp_fr_pool *srp_create_fr_pool(struct ib_device *device,
434 struct ib_pd *pd, int pool_size,
435 int max_page_list_len)
437 struct srp_fr_pool *pool;
438 struct srp_fr_desc *d;
440 int i, ret = -EINVAL;
441 enum ib_mr_type mr_type;
446 pool = kzalloc(sizeof(struct srp_fr_pool) +
447 pool_size * sizeof(struct srp_fr_desc), GFP_KERNEL);
450 pool->size = pool_size;
451 pool->max_page_list_len = max_page_list_len;
452 spin_lock_init(&pool->lock);
453 INIT_LIST_HEAD(&pool->free_list);
455 if (device->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)
456 mr_type = IB_MR_TYPE_SG_GAPS;
458 mr_type = IB_MR_TYPE_MEM_REG;
460 for (i = 0, d = &pool->desc[0]; i < pool->size; i++, d++) {
461 mr = ib_alloc_mr(pd, mr_type, max_page_list_len);
465 pr_info("%s: ib_alloc_mr() failed. Try to reduce max_cmd_per_lun, max_sect or ch_count\n",
466 dev_name(&device->dev));
470 list_add_tail(&d->entry, &pool->free_list);
477 srp_destroy_fr_pool(pool);
485 * srp_fr_pool_get() - obtain a descriptor suitable for fast registration
486 * @pool: Pool to obtain descriptor from.
488 static struct srp_fr_desc *srp_fr_pool_get(struct srp_fr_pool *pool)
490 struct srp_fr_desc *d = NULL;
493 spin_lock_irqsave(&pool->lock, flags);
494 if (!list_empty(&pool->free_list)) {
495 d = list_first_entry(&pool->free_list, typeof(*d), entry);
498 spin_unlock_irqrestore(&pool->lock, flags);
504 * srp_fr_pool_put() - put an FR descriptor back in the free list
505 * @pool: Pool the descriptor was allocated from.
506 * @desc: Pointer to an array of fast registration descriptor pointers.
507 * @n: Number of descriptors to put back.
509 * Note: The caller must already have queued an invalidation request for
510 * desc->mr->rkey before calling this function.
512 static void srp_fr_pool_put(struct srp_fr_pool *pool, struct srp_fr_desc **desc,
518 spin_lock_irqsave(&pool->lock, flags);
519 for (i = 0; i < n; i++)
520 list_add(&desc[i]->entry, &pool->free_list);
521 spin_unlock_irqrestore(&pool->lock, flags);
524 static struct srp_fr_pool *srp_alloc_fr_pool(struct srp_target_port *target)
526 struct srp_device *dev = target->srp_host->srp_dev;
528 return srp_create_fr_pool(dev->dev, dev->pd, target->mr_pool_size,
529 dev->max_pages_per_mr);
533 * srp_destroy_qp() - destroy an RDMA queue pair
534 * @ch: SRP RDMA channel.
536 * Drain the qp before destroying it. This avoids that the receive
537 * completion handler can access the queue pair while it is
540 static void srp_destroy_qp(struct srp_rdma_ch *ch)
542 spin_lock_irq(&ch->lock);
543 ib_process_cq_direct(ch->send_cq, -1);
544 spin_unlock_irq(&ch->lock);
547 ib_destroy_qp(ch->qp);
550 static int srp_create_ch_ib(struct srp_rdma_ch *ch)
552 struct srp_target_port *target = ch->target;
553 struct srp_device *dev = target->srp_host->srp_dev;
554 struct ib_qp_init_attr *init_attr;
555 struct ib_cq *recv_cq, *send_cq;
557 struct ib_fmr_pool *fmr_pool = NULL;
558 struct srp_fr_pool *fr_pool = NULL;
559 const int m = 1 + dev->use_fast_reg * target->mr_per_cmd * 2;
562 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
566 /* queue_size + 1 for ib_drain_rq() */
567 recv_cq = ib_alloc_cq(dev->dev, ch, target->queue_size + 1,
568 ch->comp_vector, IB_POLL_SOFTIRQ);
569 if (IS_ERR(recv_cq)) {
570 ret = PTR_ERR(recv_cq);
574 send_cq = ib_alloc_cq(dev->dev, ch, m * target->queue_size,
575 ch->comp_vector, IB_POLL_DIRECT);
576 if (IS_ERR(send_cq)) {
577 ret = PTR_ERR(send_cq);
581 init_attr->event_handler = srp_qp_event;
582 init_attr->cap.max_send_wr = m * target->queue_size;
583 init_attr->cap.max_recv_wr = target->queue_size + 1;
584 init_attr->cap.max_recv_sge = 1;
585 init_attr->cap.max_send_sge = SRP_MAX_SGE;
586 init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
587 init_attr->qp_type = IB_QPT_RC;
588 init_attr->send_cq = send_cq;
589 init_attr->recv_cq = recv_cq;
591 if (target->using_rdma_cm) {
592 ret = rdma_create_qp(ch->rdma_cm.cm_id, dev->pd, init_attr);
593 qp = ch->rdma_cm.cm_id->qp;
595 qp = ib_create_qp(dev->pd, init_attr);
597 ret = srp_init_ib_qp(target, qp);
605 pr_err("QP creation failed for dev %s: %d\n",
606 dev_name(&dev->dev->dev), ret);
610 if (dev->use_fast_reg) {
611 fr_pool = srp_alloc_fr_pool(target);
612 if (IS_ERR(fr_pool)) {
613 ret = PTR_ERR(fr_pool);
614 shost_printk(KERN_WARNING, target->scsi_host, PFX
615 "FR pool allocation failed (%d)\n", ret);
618 } else if (dev->use_fmr) {
619 fmr_pool = srp_alloc_fmr_pool(target);
620 if (IS_ERR(fmr_pool)) {
621 ret = PTR_ERR(fmr_pool);
622 shost_printk(KERN_WARNING, target->scsi_host, PFX
623 "FMR pool allocation failed (%d)\n", ret);
631 ib_free_cq(ch->recv_cq);
633 ib_free_cq(ch->send_cq);
636 ch->recv_cq = recv_cq;
637 ch->send_cq = send_cq;
639 if (dev->use_fast_reg) {
641 srp_destroy_fr_pool(ch->fr_pool);
642 ch->fr_pool = fr_pool;
643 } else if (dev->use_fmr) {
645 ib_destroy_fmr_pool(ch->fmr_pool);
646 ch->fmr_pool = fmr_pool;
653 if (target->using_rdma_cm)
654 rdma_destroy_qp(ch->rdma_cm.cm_id);
670 * Note: this function may be called without srp_alloc_iu_bufs() having been
671 * invoked. Hence the ch->[rt]x_ring checks.
673 static void srp_free_ch_ib(struct srp_target_port *target,
674 struct srp_rdma_ch *ch)
676 struct srp_device *dev = target->srp_host->srp_dev;
682 if (target->using_rdma_cm) {
683 if (ch->rdma_cm.cm_id) {
684 rdma_destroy_id(ch->rdma_cm.cm_id);
685 ch->rdma_cm.cm_id = NULL;
688 if (ch->ib_cm.cm_id) {
689 ib_destroy_cm_id(ch->ib_cm.cm_id);
690 ch->ib_cm.cm_id = NULL;
694 /* If srp_new_cm_id() succeeded but srp_create_ch_ib() not, return. */
698 if (dev->use_fast_reg) {
700 srp_destroy_fr_pool(ch->fr_pool);
701 } else if (dev->use_fmr) {
703 ib_destroy_fmr_pool(ch->fmr_pool);
707 ib_free_cq(ch->send_cq);
708 ib_free_cq(ch->recv_cq);
711 * Avoid that the SCSI error handler tries to use this channel after
712 * it has been freed. The SCSI error handler can namely continue
713 * trying to perform recovery actions after scsi_remove_host()
719 ch->send_cq = ch->recv_cq = NULL;
722 for (i = 0; i < target->queue_size; ++i)
723 srp_free_iu(target->srp_host, ch->rx_ring[i]);
728 for (i = 0; i < target->queue_size; ++i)
729 srp_free_iu(target->srp_host, ch->tx_ring[i]);
735 static void srp_path_rec_completion(int status,
736 struct sa_path_rec *pathrec,
739 struct srp_rdma_ch *ch = ch_ptr;
740 struct srp_target_port *target = ch->target;
744 shost_printk(KERN_ERR, target->scsi_host,
745 PFX "Got failed path rec status %d\n", status);
747 ch->ib_cm.path = *pathrec;
751 static int srp_ib_lookup_path(struct srp_rdma_ch *ch)
753 struct srp_target_port *target = ch->target;
756 ch->ib_cm.path.numb_path = 1;
758 init_completion(&ch->done);
760 ch->ib_cm.path_query_id = ib_sa_path_rec_get(&srp_sa_client,
761 target->srp_host->srp_dev->dev,
762 target->srp_host->port,
764 IB_SA_PATH_REC_SERVICE_ID |
765 IB_SA_PATH_REC_DGID |
766 IB_SA_PATH_REC_SGID |
767 IB_SA_PATH_REC_NUMB_PATH |
769 SRP_PATH_REC_TIMEOUT_MS,
771 srp_path_rec_completion,
772 ch, &ch->ib_cm.path_query);
773 if (ch->ib_cm.path_query_id < 0)
774 return ch->ib_cm.path_query_id;
776 ret = wait_for_completion_interruptible(&ch->done);
781 shost_printk(KERN_WARNING, target->scsi_host,
782 PFX "Path record query failed: sgid %pI6, dgid %pI6, pkey %#04x, service_id %#16llx\n",
783 ch->ib_cm.path.sgid.raw, ch->ib_cm.path.dgid.raw,
784 be16_to_cpu(target->ib_cm.pkey),
785 be64_to_cpu(target->ib_cm.service_id));
790 static int srp_rdma_lookup_path(struct srp_rdma_ch *ch)
792 struct srp_target_port *target = ch->target;
795 init_completion(&ch->done);
797 ret = rdma_resolve_route(ch->rdma_cm.cm_id, SRP_PATH_REC_TIMEOUT_MS);
801 wait_for_completion_interruptible(&ch->done);
804 shost_printk(KERN_WARNING, target->scsi_host,
805 PFX "Path resolution failed\n");
810 static int srp_lookup_path(struct srp_rdma_ch *ch)
812 struct srp_target_port *target = ch->target;
814 return target->using_rdma_cm ? srp_rdma_lookup_path(ch) :
815 srp_ib_lookup_path(ch);
818 static u8 srp_get_subnet_timeout(struct srp_host *host)
820 struct ib_port_attr attr;
822 u8 subnet_timeout = 18;
824 ret = ib_query_port(host->srp_dev->dev, host->port, &attr);
826 subnet_timeout = attr.subnet_timeout;
828 if (unlikely(subnet_timeout < 15))
829 pr_warn("%s: subnet timeout %d may cause SRP login to fail.\n",
830 dev_name(&host->srp_dev->dev->dev), subnet_timeout);
832 return subnet_timeout;
835 static int srp_send_req(struct srp_rdma_ch *ch, uint32_t max_iu_len,
838 struct srp_target_port *target = ch->target;
840 struct rdma_conn_param rdma_param;
841 struct srp_login_req_rdma rdma_req;
842 struct ib_cm_req_param ib_param;
843 struct srp_login_req ib_req;
848 req = kzalloc(sizeof *req, GFP_KERNEL);
852 req->ib_param.flow_control = 1;
853 req->ib_param.retry_count = target->tl_retry_count;
856 * Pick some arbitrary defaults here; we could make these
857 * module parameters if anyone cared about setting them.
859 req->ib_param.responder_resources = 4;
860 req->ib_param.rnr_retry_count = 7;
861 req->ib_param.max_cm_retries = 15;
863 req->ib_req.opcode = SRP_LOGIN_REQ;
865 req->ib_req.req_it_iu_len = cpu_to_be32(max_iu_len);
866 req->ib_req.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
867 SRP_BUF_FORMAT_INDIRECT);
868 req->ib_req.req_flags = (multich ? SRP_MULTICHAN_MULTI :
869 SRP_MULTICHAN_SINGLE);
870 if (srp_use_imm_data) {
871 req->ib_req.req_flags |= SRP_IMMED_REQUESTED;
872 req->ib_req.imm_data_offset = cpu_to_be16(SRP_IMM_DATA_OFFSET);
875 if (target->using_rdma_cm) {
876 req->rdma_param.flow_control = req->ib_param.flow_control;
877 req->rdma_param.responder_resources =
878 req->ib_param.responder_resources;
879 req->rdma_param.initiator_depth = req->ib_param.initiator_depth;
880 req->rdma_param.retry_count = req->ib_param.retry_count;
881 req->rdma_param.rnr_retry_count = req->ib_param.rnr_retry_count;
882 req->rdma_param.private_data = &req->rdma_req;
883 req->rdma_param.private_data_len = sizeof(req->rdma_req);
885 req->rdma_req.opcode = req->ib_req.opcode;
886 req->rdma_req.tag = req->ib_req.tag;
887 req->rdma_req.req_it_iu_len = req->ib_req.req_it_iu_len;
888 req->rdma_req.req_buf_fmt = req->ib_req.req_buf_fmt;
889 req->rdma_req.req_flags = req->ib_req.req_flags;
890 req->rdma_req.imm_data_offset = req->ib_req.imm_data_offset;
892 ipi = req->rdma_req.initiator_port_id;
893 tpi = req->rdma_req.target_port_id;
897 subnet_timeout = srp_get_subnet_timeout(target->srp_host);
899 req->ib_param.primary_path = &ch->ib_cm.path;
900 req->ib_param.alternate_path = NULL;
901 req->ib_param.service_id = target->ib_cm.service_id;
902 get_random_bytes(&req->ib_param.starting_psn, 4);
903 req->ib_param.starting_psn &= 0xffffff;
904 req->ib_param.qp_num = ch->qp->qp_num;
905 req->ib_param.qp_type = ch->qp->qp_type;
906 req->ib_param.local_cm_response_timeout = subnet_timeout + 2;
907 req->ib_param.remote_cm_response_timeout = subnet_timeout + 2;
908 req->ib_param.private_data = &req->ib_req;
909 req->ib_param.private_data_len = sizeof(req->ib_req);
911 ipi = req->ib_req.initiator_port_id;
912 tpi = req->ib_req.target_port_id;
916 * In the published SRP specification (draft rev. 16a), the
917 * port identifier format is 8 bytes of ID extension followed
918 * by 8 bytes of GUID. Older drafts put the two halves in the
919 * opposite order, so that the GUID comes first.
921 * Targets conforming to these obsolete drafts can be
922 * recognized by the I/O Class they report.
924 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
925 memcpy(ipi, &target->sgid.global.interface_id, 8);
926 memcpy(ipi + 8, &target->initiator_ext, 8);
927 memcpy(tpi, &target->ioc_guid, 8);
928 memcpy(tpi + 8, &target->id_ext, 8);
930 memcpy(ipi, &target->initiator_ext, 8);
931 memcpy(ipi + 8, &target->sgid.global.interface_id, 8);
932 memcpy(tpi, &target->id_ext, 8);
933 memcpy(tpi + 8, &target->ioc_guid, 8);
937 * Topspin/Cisco SRP targets will reject our login unless we
938 * zero out the first 8 bytes of our initiator port ID and set
939 * the second 8 bytes to the local node GUID.
941 if (srp_target_is_topspin(target)) {
942 shost_printk(KERN_DEBUG, target->scsi_host,
943 PFX "Topspin/Cisco initiator port ID workaround "
944 "activated for target GUID %016llx\n",
945 be64_to_cpu(target->ioc_guid));
947 memcpy(ipi + 8, &target->srp_host->srp_dev->dev->node_guid, 8);
950 if (target->using_rdma_cm)
951 status = rdma_connect(ch->rdma_cm.cm_id, &req->rdma_param);
953 status = ib_send_cm_req(ch->ib_cm.cm_id, &req->ib_param);
960 static bool srp_queue_remove_work(struct srp_target_port *target)
962 bool changed = false;
964 spin_lock_irq(&target->lock);
965 if (target->state != SRP_TARGET_REMOVED) {
966 target->state = SRP_TARGET_REMOVED;
969 spin_unlock_irq(&target->lock);
972 queue_work(srp_remove_wq, &target->remove_work);
977 static void srp_disconnect_target(struct srp_target_port *target)
979 struct srp_rdma_ch *ch;
982 /* XXX should send SRP_I_LOGOUT request */
984 for (i = 0; i < target->ch_count; i++) {
986 ch->connected = false;
988 if (target->using_rdma_cm) {
989 if (ch->rdma_cm.cm_id)
990 rdma_disconnect(ch->rdma_cm.cm_id);
993 ret = ib_send_cm_dreq(ch->ib_cm.cm_id,
997 shost_printk(KERN_DEBUG, target->scsi_host,
998 PFX "Sending CM DREQ failed\n");
1003 static void srp_free_req_data(struct srp_target_port *target,
1004 struct srp_rdma_ch *ch)
1006 struct srp_device *dev = target->srp_host->srp_dev;
1007 struct ib_device *ibdev = dev->dev;
1008 struct srp_request *req;
1014 for (i = 0; i < target->req_ring_size; ++i) {
1015 req = &ch->req_ring[i];
1016 if (dev->use_fast_reg) {
1017 kfree(req->fr_list);
1019 kfree(req->fmr_list);
1020 kfree(req->map_page);
1022 if (req->indirect_dma_addr) {
1023 ib_dma_unmap_single(ibdev, req->indirect_dma_addr,
1024 target->indirect_size,
1027 kfree(req->indirect_desc);
1030 kfree(ch->req_ring);
1031 ch->req_ring = NULL;
1034 static int srp_alloc_req_data(struct srp_rdma_ch *ch)
1036 struct srp_target_port *target = ch->target;
1037 struct srp_device *srp_dev = target->srp_host->srp_dev;
1038 struct ib_device *ibdev = srp_dev->dev;
1039 struct srp_request *req;
1041 dma_addr_t dma_addr;
1042 int i, ret = -ENOMEM;
1044 ch->req_ring = kcalloc(target->req_ring_size, sizeof(*ch->req_ring),
1049 for (i = 0; i < target->req_ring_size; ++i) {
1050 req = &ch->req_ring[i];
1051 mr_list = kmalloc_array(target->mr_per_cmd, sizeof(void *),
1055 if (srp_dev->use_fast_reg) {
1056 req->fr_list = mr_list;
1058 req->fmr_list = mr_list;
1059 req->map_page = kmalloc_array(srp_dev->max_pages_per_mr,
1065 req->indirect_desc = kmalloc(target->indirect_size, GFP_KERNEL);
1066 if (!req->indirect_desc)
1069 dma_addr = ib_dma_map_single(ibdev, req->indirect_desc,
1070 target->indirect_size,
1072 if (ib_dma_mapping_error(ibdev, dma_addr))
1075 req->indirect_dma_addr = dma_addr;
1084 * srp_del_scsi_host_attr() - Remove attributes defined in the host template.
1085 * @shost: SCSI host whose attributes to remove from sysfs.
1087 * Note: Any attributes defined in the host template and that did not exist
1088 * before invocation of this function will be ignored.
1090 static void srp_del_scsi_host_attr(struct Scsi_Host *shost)
1092 struct device_attribute **attr;
1094 for (attr = shost->hostt->shost_attrs; attr && *attr; ++attr)
1095 device_remove_file(&shost->shost_dev, *attr);
1098 static void srp_remove_target(struct srp_target_port *target)
1100 struct srp_rdma_ch *ch;
1103 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
1105 srp_del_scsi_host_attr(target->scsi_host);
1106 srp_rport_get(target->rport);
1107 srp_remove_host(target->scsi_host);
1108 scsi_remove_host(target->scsi_host);
1109 srp_stop_rport_timers(target->rport);
1110 srp_disconnect_target(target);
1111 kobj_ns_drop(KOBJ_NS_TYPE_NET, target->net);
1112 for (i = 0; i < target->ch_count; i++) {
1113 ch = &target->ch[i];
1114 srp_free_ch_ib(target, ch);
1116 cancel_work_sync(&target->tl_err_work);
1117 srp_rport_put(target->rport);
1118 for (i = 0; i < target->ch_count; i++) {
1119 ch = &target->ch[i];
1120 srp_free_req_data(target, ch);
1125 spin_lock(&target->srp_host->target_lock);
1126 list_del(&target->list);
1127 spin_unlock(&target->srp_host->target_lock);
1129 scsi_host_put(target->scsi_host);
1132 static void srp_remove_work(struct work_struct *work)
1134 struct srp_target_port *target =
1135 container_of(work, struct srp_target_port, remove_work);
1137 WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
1139 srp_remove_target(target);
1142 static void srp_rport_delete(struct srp_rport *rport)
1144 struct srp_target_port *target = rport->lld_data;
1146 srp_queue_remove_work(target);
1150 * srp_connected_ch() - number of connected channels
1151 * @target: SRP target port.
1153 static int srp_connected_ch(struct srp_target_port *target)
1157 for (i = 0; i < target->ch_count; i++)
1158 c += target->ch[i].connected;
1163 static int srp_connect_ch(struct srp_rdma_ch *ch, uint32_t max_iu_len,
1166 struct srp_target_port *target = ch->target;
1169 WARN_ON_ONCE(!multich && srp_connected_ch(target) > 0);
1171 ret = srp_lookup_path(ch);
1176 init_completion(&ch->done);
1177 ret = srp_send_req(ch, max_iu_len, multich);
1180 ret = wait_for_completion_interruptible(&ch->done);
1185 * The CM event handling code will set status to
1186 * SRP_PORT_REDIRECT if we get a port redirect REJ
1187 * back, or SRP_DLID_REDIRECT if we get a lid/qp
1188 * redirect REJ back.
1193 ch->connected = true;
1196 case SRP_PORT_REDIRECT:
1197 ret = srp_lookup_path(ch);
1202 case SRP_DLID_REDIRECT:
1205 case SRP_STALE_CONN:
1206 shost_printk(KERN_ERR, target->scsi_host, PFX
1207 "giving up on stale connection\n");
1217 return ret <= 0 ? ret : -ENODEV;
1220 static void srp_inv_rkey_err_done(struct ib_cq *cq, struct ib_wc *wc)
1222 srp_handle_qp_err(cq, wc, "INV RKEY");
1225 static int srp_inv_rkey(struct srp_request *req, struct srp_rdma_ch *ch,
1228 struct ib_send_wr wr = {
1229 .opcode = IB_WR_LOCAL_INV,
1233 .ex.invalidate_rkey = rkey,
1236 wr.wr_cqe = &req->reg_cqe;
1237 req->reg_cqe.done = srp_inv_rkey_err_done;
1238 return ib_post_send(ch->qp, &wr, NULL);
1241 static void srp_unmap_data(struct scsi_cmnd *scmnd,
1242 struct srp_rdma_ch *ch,
1243 struct srp_request *req)
1245 struct srp_target_port *target = ch->target;
1246 struct srp_device *dev = target->srp_host->srp_dev;
1247 struct ib_device *ibdev = dev->dev;
1250 if (!scsi_sglist(scmnd) ||
1251 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
1252 scmnd->sc_data_direction != DMA_FROM_DEVICE))
1255 if (dev->use_fast_reg) {
1256 struct srp_fr_desc **pfr;
1258 for (i = req->nmdesc, pfr = req->fr_list; i > 0; i--, pfr++) {
1259 res = srp_inv_rkey(req, ch, (*pfr)->mr->rkey);
1261 shost_printk(KERN_ERR, target->scsi_host, PFX
1262 "Queueing INV WR for rkey %#x failed (%d)\n",
1263 (*pfr)->mr->rkey, res);
1264 queue_work(system_long_wq,
1265 &target->tl_err_work);
1269 srp_fr_pool_put(ch->fr_pool, req->fr_list,
1271 } else if (dev->use_fmr) {
1272 struct ib_pool_fmr **pfmr;
1274 for (i = req->nmdesc, pfmr = req->fmr_list; i > 0; i--, pfmr++)
1275 ib_fmr_pool_unmap(*pfmr);
1278 ib_dma_unmap_sg(ibdev, scsi_sglist(scmnd), scsi_sg_count(scmnd),
1279 scmnd->sc_data_direction);
1283 * srp_claim_req - Take ownership of the scmnd associated with a request.
1284 * @ch: SRP RDMA channel.
1285 * @req: SRP request.
1286 * @sdev: If not NULL, only take ownership for this SCSI device.
1287 * @scmnd: If NULL, take ownership of @req->scmnd. If not NULL, only take
1288 * ownership of @req->scmnd if it equals @scmnd.
1291 * Either NULL or a pointer to the SCSI command the caller became owner of.
1293 static struct scsi_cmnd *srp_claim_req(struct srp_rdma_ch *ch,
1294 struct srp_request *req,
1295 struct scsi_device *sdev,
1296 struct scsi_cmnd *scmnd)
1298 unsigned long flags;
1300 spin_lock_irqsave(&ch->lock, flags);
1302 (!sdev || req->scmnd->device == sdev) &&
1303 (!scmnd || req->scmnd == scmnd)) {
1309 spin_unlock_irqrestore(&ch->lock, flags);
1315 * srp_free_req() - Unmap data and adjust ch->req_lim.
1316 * @ch: SRP RDMA channel.
1317 * @req: Request to be freed.
1318 * @scmnd: SCSI command associated with @req.
1319 * @req_lim_delta: Amount to be added to @target->req_lim.
1321 static void srp_free_req(struct srp_rdma_ch *ch, struct srp_request *req,
1322 struct scsi_cmnd *scmnd, s32 req_lim_delta)
1324 unsigned long flags;
1326 srp_unmap_data(scmnd, ch, req);
1328 spin_lock_irqsave(&ch->lock, flags);
1329 ch->req_lim += req_lim_delta;
1330 spin_unlock_irqrestore(&ch->lock, flags);
1333 static void srp_finish_req(struct srp_rdma_ch *ch, struct srp_request *req,
1334 struct scsi_device *sdev, int result)
1336 struct scsi_cmnd *scmnd = srp_claim_req(ch, req, sdev, NULL);
1339 srp_free_req(ch, req, scmnd, 0);
1340 scmnd->result = result;
1341 scmnd->scsi_done(scmnd);
1345 static void srp_terminate_io(struct srp_rport *rport)
1347 struct srp_target_port *target = rport->lld_data;
1348 struct srp_rdma_ch *ch;
1351 for (i = 0; i < target->ch_count; i++) {
1352 ch = &target->ch[i];
1354 for (j = 0; j < target->req_ring_size; ++j) {
1355 struct srp_request *req = &ch->req_ring[j];
1357 srp_finish_req(ch, req, NULL,
1358 DID_TRANSPORT_FAILFAST << 16);
1363 /* Calculate maximum initiator to target information unit length. */
1364 static uint32_t srp_max_it_iu_len(int cmd_sg_cnt, bool use_imm_data)
1366 uint32_t max_iu_len = sizeof(struct srp_cmd) + SRP_MAX_ADD_CDB_LEN +
1367 sizeof(struct srp_indirect_buf) +
1368 cmd_sg_cnt * sizeof(struct srp_direct_buf);
1371 max_iu_len = max(max_iu_len, SRP_IMM_DATA_OFFSET +
1378 * It is up to the caller to ensure that srp_rport_reconnect() calls are
1379 * serialized and that no concurrent srp_queuecommand(), srp_abort(),
1380 * srp_reset_device() or srp_reset_host() calls will occur while this function
1381 * is in progress. One way to realize that is not to call this function
1382 * directly but to call srp_reconnect_rport() instead since that last function
1383 * serializes calls of this function via rport->mutex and also blocks
1384 * srp_queuecommand() calls before invoking this function.
1386 static int srp_rport_reconnect(struct srp_rport *rport)
1388 struct srp_target_port *target = rport->lld_data;
1389 struct srp_rdma_ch *ch;
1390 uint32_t max_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt,
1393 bool multich = false;
1395 srp_disconnect_target(target);
1397 if (target->state == SRP_TARGET_SCANNING)
1401 * Now get a new local CM ID so that we avoid confusing the target in
1402 * case things are really fouled up. Doing so also ensures that all CM
1403 * callbacks will have finished before a new QP is allocated.
1405 for (i = 0; i < target->ch_count; i++) {
1406 ch = &target->ch[i];
1407 ret += srp_new_cm_id(ch);
1409 for (i = 0; i < target->ch_count; i++) {
1410 ch = &target->ch[i];
1411 for (j = 0; j < target->req_ring_size; ++j) {
1412 struct srp_request *req = &ch->req_ring[j];
1414 srp_finish_req(ch, req, NULL, DID_RESET << 16);
1417 for (i = 0; i < target->ch_count; i++) {
1418 ch = &target->ch[i];
1420 * Whether or not creating a new CM ID succeeded, create a new
1421 * QP. This guarantees that all completion callback function
1422 * invocations have finished before request resetting starts.
1424 ret += srp_create_ch_ib(ch);
1426 INIT_LIST_HEAD(&ch->free_tx);
1427 for (j = 0; j < target->queue_size; ++j)
1428 list_add(&ch->tx_ring[j]->list, &ch->free_tx);
1431 target->qp_in_error = false;
1433 for (i = 0; i < target->ch_count; i++) {
1434 ch = &target->ch[i];
1437 ret = srp_connect_ch(ch, max_iu_len, multich);
1442 shost_printk(KERN_INFO, target->scsi_host,
1443 PFX "reconnect succeeded\n");
1448 static void srp_map_desc(struct srp_map_state *state, dma_addr_t dma_addr,
1449 unsigned int dma_len, u32 rkey)
1451 struct srp_direct_buf *desc = state->desc;
1453 WARN_ON_ONCE(!dma_len);
1455 desc->va = cpu_to_be64(dma_addr);
1456 desc->key = cpu_to_be32(rkey);
1457 desc->len = cpu_to_be32(dma_len);
1459 state->total_len += dma_len;
1464 static int srp_map_finish_fmr(struct srp_map_state *state,
1465 struct srp_rdma_ch *ch)
1467 struct srp_target_port *target = ch->target;
1468 struct srp_device *dev = target->srp_host->srp_dev;
1469 struct ib_pool_fmr *fmr;
1472 if (state->fmr.next >= state->fmr.end) {
1473 shost_printk(KERN_ERR, ch->target->scsi_host,
1474 PFX "Out of MRs (mr_per_cmd = %d)\n",
1475 ch->target->mr_per_cmd);
1479 WARN_ON_ONCE(!dev->use_fmr);
1481 if (state->npages == 0)
1484 if (state->npages == 1 && target->global_rkey) {
1485 srp_map_desc(state, state->base_dma_addr, state->dma_len,
1486 target->global_rkey);
1490 fmr = ib_fmr_pool_map_phys(ch->fmr_pool, state->pages,
1491 state->npages, io_addr);
1493 return PTR_ERR(fmr);
1495 *state->fmr.next++ = fmr;
1498 srp_map_desc(state, state->base_dma_addr & ~dev->mr_page_mask,
1499 state->dma_len, fmr->fmr->rkey);
1508 static void srp_reg_mr_err_done(struct ib_cq *cq, struct ib_wc *wc)
1510 srp_handle_qp_err(cq, wc, "FAST REG");
1514 * Map up to sg_nents elements of state->sg where *sg_offset_p is the offset
1515 * where to start in the first element. If sg_offset_p != NULL then
1516 * *sg_offset_p is updated to the offset in state->sg[retval] of the first
1517 * byte that has not yet been mapped.
1519 static int srp_map_finish_fr(struct srp_map_state *state,
1520 struct srp_request *req,
1521 struct srp_rdma_ch *ch, int sg_nents,
1522 unsigned int *sg_offset_p)
1524 struct srp_target_port *target = ch->target;
1525 struct srp_device *dev = target->srp_host->srp_dev;
1526 struct ib_reg_wr wr;
1527 struct srp_fr_desc *desc;
1531 if (state->fr.next >= state->fr.end) {
1532 shost_printk(KERN_ERR, ch->target->scsi_host,
1533 PFX "Out of MRs (mr_per_cmd = %d)\n",
1534 ch->target->mr_per_cmd);
1538 WARN_ON_ONCE(!dev->use_fast_reg);
1540 if (sg_nents == 1 && target->global_rkey) {
1541 unsigned int sg_offset = sg_offset_p ? *sg_offset_p : 0;
1543 srp_map_desc(state, sg_dma_address(state->sg) + sg_offset,
1544 sg_dma_len(state->sg) - sg_offset,
1545 target->global_rkey);
1551 desc = srp_fr_pool_get(ch->fr_pool);
1555 rkey = ib_inc_rkey(desc->mr->rkey);
1556 ib_update_fast_reg_key(desc->mr, rkey);
1558 n = ib_map_mr_sg(desc->mr, state->sg, sg_nents, sg_offset_p,
1560 if (unlikely(n < 0)) {
1561 srp_fr_pool_put(ch->fr_pool, &desc, 1);
1562 pr_debug("%s: ib_map_mr_sg(%d, %d) returned %d.\n",
1563 dev_name(&req->scmnd->device->sdev_gendev), sg_nents,
1564 sg_offset_p ? *sg_offset_p : -1, n);
1568 WARN_ON_ONCE(desc->mr->length == 0);
1570 req->reg_cqe.done = srp_reg_mr_err_done;
1573 wr.wr.opcode = IB_WR_REG_MR;
1574 wr.wr.wr_cqe = &req->reg_cqe;
1576 wr.wr.send_flags = 0;
1578 wr.key = desc->mr->rkey;
1579 wr.access = (IB_ACCESS_LOCAL_WRITE |
1580 IB_ACCESS_REMOTE_READ |
1581 IB_ACCESS_REMOTE_WRITE);
1583 *state->fr.next++ = desc;
1586 srp_map_desc(state, desc->mr->iova,
1587 desc->mr->length, desc->mr->rkey);
1589 err = ib_post_send(ch->qp, &wr.wr, NULL);
1590 if (unlikely(err)) {
1591 WARN_ON_ONCE(err == -ENOMEM);
1598 static int srp_map_sg_entry(struct srp_map_state *state,
1599 struct srp_rdma_ch *ch,
1600 struct scatterlist *sg)
1602 struct srp_target_port *target = ch->target;
1603 struct srp_device *dev = target->srp_host->srp_dev;
1604 struct ib_device *ibdev = dev->dev;
1605 dma_addr_t dma_addr = ib_sg_dma_address(ibdev, sg);
1606 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
1607 unsigned int len = 0;
1610 WARN_ON_ONCE(!dma_len);
1613 unsigned offset = dma_addr & ~dev->mr_page_mask;
1615 if (state->npages == dev->max_pages_per_mr ||
1616 (state->npages > 0 && offset != 0)) {
1617 ret = srp_map_finish_fmr(state, ch);
1622 len = min_t(unsigned int, dma_len, dev->mr_page_size - offset);
1625 state->base_dma_addr = dma_addr;
1626 state->pages[state->npages++] = dma_addr & dev->mr_page_mask;
1627 state->dma_len += len;
1633 * If the end of the MR is not on a page boundary then we need to
1634 * close it out and start a new one -- we can only merge at page
1638 if ((dma_addr & ~dev->mr_page_mask) != 0)
1639 ret = srp_map_finish_fmr(state, ch);
1643 static int srp_map_sg_fmr(struct srp_map_state *state, struct srp_rdma_ch *ch,
1644 struct srp_request *req, struct scatterlist *scat,
1647 struct scatterlist *sg;
1650 state->pages = req->map_page;
1651 state->fmr.next = req->fmr_list;
1652 state->fmr.end = req->fmr_list + ch->target->mr_per_cmd;
1654 for_each_sg(scat, sg, count, i) {
1655 ret = srp_map_sg_entry(state, ch, sg);
1660 ret = srp_map_finish_fmr(state, ch);
1667 static int srp_map_sg_fr(struct srp_map_state *state, struct srp_rdma_ch *ch,
1668 struct srp_request *req, struct scatterlist *scat,
1671 unsigned int sg_offset = 0;
1673 state->fr.next = req->fr_list;
1674 state->fr.end = req->fr_list + ch->target->mr_per_cmd;
1683 n = srp_map_finish_fr(state, req, ch, count, &sg_offset);
1684 if (unlikely(n < 0))
1688 for (i = 0; i < n; i++)
1689 state->sg = sg_next(state->sg);
1695 static int srp_map_sg_dma(struct srp_map_state *state, struct srp_rdma_ch *ch,
1696 struct srp_request *req, struct scatterlist *scat,
1699 struct srp_target_port *target = ch->target;
1700 struct srp_device *dev = target->srp_host->srp_dev;
1701 struct scatterlist *sg;
1704 for_each_sg(scat, sg, count, i) {
1705 srp_map_desc(state, ib_sg_dma_address(dev->dev, sg),
1706 ib_sg_dma_len(dev->dev, sg),
1707 target->global_rkey);
1714 * Register the indirect data buffer descriptor with the HCA.
1716 * Note: since the indirect data buffer descriptor has been allocated with
1717 * kmalloc() it is guaranteed that this buffer is a physically contiguous
1720 static int srp_map_idb(struct srp_rdma_ch *ch, struct srp_request *req,
1721 void **next_mr, void **end_mr, u32 idb_len,
1724 struct srp_target_port *target = ch->target;
1725 struct srp_device *dev = target->srp_host->srp_dev;
1726 struct srp_map_state state;
1727 struct srp_direct_buf idb_desc;
1729 struct scatterlist idb_sg[1];
1732 memset(&state, 0, sizeof(state));
1733 memset(&idb_desc, 0, sizeof(idb_desc));
1734 state.gen.next = next_mr;
1735 state.gen.end = end_mr;
1736 state.desc = &idb_desc;
1737 state.base_dma_addr = req->indirect_dma_addr;
1738 state.dma_len = idb_len;
1740 if (dev->use_fast_reg) {
1742 sg_init_one(idb_sg, req->indirect_desc, idb_len);
1743 idb_sg->dma_address = req->indirect_dma_addr; /* hack! */
1744 #ifdef CONFIG_NEED_SG_DMA_LENGTH
1745 idb_sg->dma_length = idb_sg->length; /* hack^2 */
1747 ret = srp_map_finish_fr(&state, req, ch, 1, NULL);
1750 WARN_ON_ONCE(ret < 1);
1751 } else if (dev->use_fmr) {
1752 state.pages = idb_pages;
1753 state.pages[0] = (req->indirect_dma_addr &
1756 ret = srp_map_finish_fmr(&state, ch);
1763 *idb_rkey = idb_desc.key;
1768 static void srp_check_mapping(struct srp_map_state *state,
1769 struct srp_rdma_ch *ch, struct srp_request *req,
1770 struct scatterlist *scat, int count)
1772 struct srp_device *dev = ch->target->srp_host->srp_dev;
1773 struct srp_fr_desc **pfr;
1774 u64 desc_len = 0, mr_len = 0;
1777 for (i = 0; i < state->ndesc; i++)
1778 desc_len += be32_to_cpu(req->indirect_desc[i].len);
1779 if (dev->use_fast_reg)
1780 for (i = 0, pfr = req->fr_list; i < state->nmdesc; i++, pfr++)
1781 mr_len += (*pfr)->mr->length;
1782 else if (dev->use_fmr)
1783 for (i = 0; i < state->nmdesc; i++)
1784 mr_len += be32_to_cpu(req->indirect_desc[i].len);
1785 if (desc_len != scsi_bufflen(req->scmnd) ||
1786 mr_len > scsi_bufflen(req->scmnd))
1787 pr_err("Inconsistent: scsi len %d <> desc len %lld <> mr len %lld; ndesc %d; nmdesc = %d\n",
1788 scsi_bufflen(req->scmnd), desc_len, mr_len,
1789 state->ndesc, state->nmdesc);
1793 * srp_map_data() - map SCSI data buffer onto an SRP request
1794 * @scmnd: SCSI command to map
1795 * @ch: SRP RDMA channel
1798 * Returns the length in bytes of the SRP_CMD IU or a negative value if
1799 * mapping failed. The size of any immediate data is not included in the
1802 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_rdma_ch *ch,
1803 struct srp_request *req)
1805 struct srp_target_port *target = ch->target;
1806 struct scatterlist *scat, *sg;
1807 struct srp_cmd *cmd = req->cmd->buf;
1808 int i, len, nents, count, ret;
1809 struct srp_device *dev;
1810 struct ib_device *ibdev;
1811 struct srp_map_state state;
1812 struct srp_indirect_buf *indirect_hdr;
1814 u32 idb_len, table_len;
1818 req->cmd->num_sge = 1;
1820 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
1821 return sizeof(struct srp_cmd) + cmd->add_cdb_len;
1823 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
1824 scmnd->sc_data_direction != DMA_TO_DEVICE) {
1825 shost_printk(KERN_WARNING, target->scsi_host,
1826 PFX "Unhandled data direction %d\n",
1827 scmnd->sc_data_direction);
1831 nents = scsi_sg_count(scmnd);
1832 scat = scsi_sglist(scmnd);
1833 data_len = scsi_bufflen(scmnd);
1835 dev = target->srp_host->srp_dev;
1838 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
1839 if (unlikely(count == 0))
1842 if (ch->use_imm_data &&
1843 count <= SRP_MAX_IMM_SGE &&
1844 SRP_IMM_DATA_OFFSET + data_len <= ch->max_it_iu_len &&
1845 scmnd->sc_data_direction == DMA_TO_DEVICE) {
1846 struct srp_imm_buf *buf;
1847 struct ib_sge *sge = &req->cmd->sge[1];
1849 fmt = SRP_DATA_DESC_IMM;
1850 len = SRP_IMM_DATA_OFFSET;
1852 buf = (void *)cmd->add_data + cmd->add_cdb_len;
1853 buf->len = cpu_to_be32(data_len);
1854 WARN_ON_ONCE((void *)(buf + 1) > (void *)cmd + len);
1855 for_each_sg(scat, sg, count, i) {
1856 sge[i].addr = ib_sg_dma_address(ibdev, sg);
1857 sge[i].length = ib_sg_dma_len(ibdev, sg);
1858 sge[i].lkey = target->lkey;
1860 req->cmd->num_sge += count;
1864 fmt = SRP_DATA_DESC_DIRECT;
1865 len = sizeof(struct srp_cmd) + cmd->add_cdb_len +
1866 sizeof(struct srp_direct_buf);
1868 if (count == 1 && target->global_rkey) {
1870 * The midlayer only generated a single gather/scatter
1871 * entry, or DMA mapping coalesced everything to a
1872 * single entry. So a direct descriptor along with
1873 * the DMA MR suffices.
1875 struct srp_direct_buf *buf;
1877 buf = (void *)cmd->add_data + cmd->add_cdb_len;
1878 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
1879 buf->key = cpu_to_be32(target->global_rkey);
1880 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
1887 * We have more than one scatter/gather entry, so build our indirect
1888 * descriptor table, trying to merge as many entries as we can.
1890 indirect_hdr = (void *)cmd->add_data + cmd->add_cdb_len;
1892 ib_dma_sync_single_for_cpu(ibdev, req->indirect_dma_addr,
1893 target->indirect_size, DMA_TO_DEVICE);
1895 memset(&state, 0, sizeof(state));
1896 state.desc = req->indirect_desc;
1897 if (dev->use_fast_reg)
1898 ret = srp_map_sg_fr(&state, ch, req, scat, count);
1899 else if (dev->use_fmr)
1900 ret = srp_map_sg_fmr(&state, ch, req, scat, count);
1902 ret = srp_map_sg_dma(&state, ch, req, scat, count);
1903 req->nmdesc = state.nmdesc;
1908 DEFINE_DYNAMIC_DEBUG_METADATA(ddm,
1909 "Memory mapping consistency check");
1910 if (DYNAMIC_DEBUG_BRANCH(ddm))
1911 srp_check_mapping(&state, ch, req, scat, count);
1914 /* We've mapped the request, now pull as much of the indirect
1915 * descriptor table as we can into the command buffer. If this
1916 * target is not using an external indirect table, we are
1917 * guaranteed to fit into the command, as the SCSI layer won't
1918 * give us more S/G entries than we allow.
1920 if (state.ndesc == 1) {
1922 * Memory registration collapsed the sg-list into one entry,
1923 * so use a direct descriptor.
1925 struct srp_direct_buf *buf;
1927 buf = (void *)cmd->add_data + cmd->add_cdb_len;
1928 *buf = req->indirect_desc[0];
1932 if (unlikely(target->cmd_sg_cnt < state.ndesc &&
1933 !target->allow_ext_sg)) {
1934 shost_printk(KERN_ERR, target->scsi_host,
1935 "Could not fit S/G list into SRP_CMD\n");
1940 count = min(state.ndesc, target->cmd_sg_cnt);
1941 table_len = state.ndesc * sizeof (struct srp_direct_buf);
1942 idb_len = sizeof(struct srp_indirect_buf) + table_len;
1944 fmt = SRP_DATA_DESC_INDIRECT;
1945 len = sizeof(struct srp_cmd) + cmd->add_cdb_len +
1946 sizeof(struct srp_indirect_buf);
1947 len += count * sizeof (struct srp_direct_buf);
1949 memcpy(indirect_hdr->desc_list, req->indirect_desc,
1950 count * sizeof (struct srp_direct_buf));
1952 if (!target->global_rkey) {
1953 ret = srp_map_idb(ch, req, state.gen.next, state.gen.end,
1954 idb_len, &idb_rkey);
1959 idb_rkey = cpu_to_be32(target->global_rkey);
1962 indirect_hdr->table_desc.va = cpu_to_be64(req->indirect_dma_addr);
1963 indirect_hdr->table_desc.key = idb_rkey;
1964 indirect_hdr->table_desc.len = cpu_to_be32(table_len);
1965 indirect_hdr->len = cpu_to_be32(state.total_len);
1967 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1968 cmd->data_out_desc_cnt = count;
1970 cmd->data_in_desc_cnt = count;
1972 ib_dma_sync_single_for_device(ibdev, req->indirect_dma_addr, table_len,
1976 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
1977 cmd->buf_fmt = fmt << 4;
1984 srp_unmap_data(scmnd, ch, req);
1985 if (ret == -ENOMEM && req->nmdesc >= target->mr_pool_size)
1991 * Return an IU and possible credit to the free pool
1993 static void srp_put_tx_iu(struct srp_rdma_ch *ch, struct srp_iu *iu,
1994 enum srp_iu_type iu_type)
1996 unsigned long flags;
1998 spin_lock_irqsave(&ch->lock, flags);
1999 list_add(&iu->list, &ch->free_tx);
2000 if (iu_type != SRP_IU_RSP)
2002 spin_unlock_irqrestore(&ch->lock, flags);
2006 * Must be called with ch->lock held to protect req_lim and free_tx.
2007 * If IU is not sent, it must be returned using srp_put_tx_iu().
2010 * An upper limit for the number of allocated information units for each
2012 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
2013 * more than Scsi_Host.can_queue requests.
2014 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
2015 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
2016 * one unanswered SRP request to an initiator.
2018 static struct srp_iu *__srp_get_tx_iu(struct srp_rdma_ch *ch,
2019 enum srp_iu_type iu_type)
2021 struct srp_target_port *target = ch->target;
2022 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
2025 lockdep_assert_held(&ch->lock);
2027 ib_process_cq_direct(ch->send_cq, -1);
2029 if (list_empty(&ch->free_tx))
2032 /* Initiator responses to target requests do not consume credits */
2033 if (iu_type != SRP_IU_RSP) {
2034 if (ch->req_lim <= rsv) {
2035 ++target->zero_req_lim;
2042 iu = list_first_entry(&ch->free_tx, struct srp_iu, list);
2043 list_del(&iu->list);
2048 * Note: if this function is called from inside ib_drain_sq() then it will
2049 * be called without ch->lock being held. If ib_drain_sq() dequeues a WQE
2050 * with status IB_WC_SUCCESS then that's a bug.
2052 static void srp_send_done(struct ib_cq *cq, struct ib_wc *wc)
2054 struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
2055 struct srp_rdma_ch *ch = cq->cq_context;
2057 if (unlikely(wc->status != IB_WC_SUCCESS)) {
2058 srp_handle_qp_err(cq, wc, "SEND");
2062 lockdep_assert_held(&ch->lock);
2064 list_add(&iu->list, &ch->free_tx);
2068 * srp_post_send() - send an SRP information unit
2069 * @ch: RDMA channel over which to send the information unit.
2070 * @iu: Information unit to send.
2071 * @len: Length of the information unit excluding immediate data.
2073 static int srp_post_send(struct srp_rdma_ch *ch, struct srp_iu *iu, int len)
2075 struct srp_target_port *target = ch->target;
2076 struct ib_send_wr wr;
2078 if (WARN_ON_ONCE(iu->num_sge > SRP_MAX_SGE))
2081 iu->sge[0].addr = iu->dma;
2082 iu->sge[0].length = len;
2083 iu->sge[0].lkey = target->lkey;
2085 iu->cqe.done = srp_send_done;
2088 wr.wr_cqe = &iu->cqe;
2089 wr.sg_list = &iu->sge[0];
2090 wr.num_sge = iu->num_sge;
2091 wr.opcode = IB_WR_SEND;
2092 wr.send_flags = IB_SEND_SIGNALED;
2094 return ib_post_send(ch->qp, &wr, NULL);
2097 static int srp_post_recv(struct srp_rdma_ch *ch, struct srp_iu *iu)
2099 struct srp_target_port *target = ch->target;
2100 struct ib_recv_wr wr;
2103 list.addr = iu->dma;
2104 list.length = iu->size;
2105 list.lkey = target->lkey;
2107 iu->cqe.done = srp_recv_done;
2110 wr.wr_cqe = &iu->cqe;
2114 return ib_post_recv(ch->qp, &wr, NULL);
2117 static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
2119 struct srp_target_port *target = ch->target;
2120 struct srp_request *req;
2121 struct scsi_cmnd *scmnd;
2122 unsigned long flags;
2124 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
2125 spin_lock_irqsave(&ch->lock, flags);
2126 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
2127 if (rsp->tag == ch->tsk_mgmt_tag) {
2128 ch->tsk_mgmt_status = -1;
2129 if (be32_to_cpu(rsp->resp_data_len) >= 4)
2130 ch->tsk_mgmt_status = rsp->data[3];
2131 complete(&ch->tsk_mgmt_done);
2133 shost_printk(KERN_ERR, target->scsi_host,
2134 "Received tsk mgmt response too late for tag %#llx\n",
2137 spin_unlock_irqrestore(&ch->lock, flags);
2139 scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
2140 if (scmnd && scmnd->host_scribble) {
2141 req = (void *)scmnd->host_scribble;
2142 scmnd = srp_claim_req(ch, req, NULL, scmnd);
2147 shost_printk(KERN_ERR, target->scsi_host,
2148 "Null scmnd for RSP w/tag %#016llx received on ch %td / QP %#x\n",
2149 rsp->tag, ch - target->ch, ch->qp->qp_num);
2151 spin_lock_irqsave(&ch->lock, flags);
2152 ch->req_lim += be32_to_cpu(rsp->req_lim_delta);
2153 spin_unlock_irqrestore(&ch->lock, flags);
2157 scmnd->result = rsp->status;
2159 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
2160 memcpy(scmnd->sense_buffer, rsp->data +
2161 be32_to_cpu(rsp->resp_data_len),
2162 min_t(int, be32_to_cpu(rsp->sense_data_len),
2163 SCSI_SENSE_BUFFERSIZE));
2166 if (unlikely(rsp->flags & SRP_RSP_FLAG_DIUNDER))
2167 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
2168 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DIOVER))
2169 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_in_res_cnt));
2170 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOUNDER))
2171 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
2172 else if (unlikely(rsp->flags & SRP_RSP_FLAG_DOOVER))
2173 scsi_set_resid(scmnd, -be32_to_cpu(rsp->data_out_res_cnt));
2175 srp_free_req(ch, req, scmnd,
2176 be32_to_cpu(rsp->req_lim_delta));
2178 scmnd->host_scribble = NULL;
2179 scmnd->scsi_done(scmnd);
2183 static int srp_response_common(struct srp_rdma_ch *ch, s32 req_delta,
2186 struct srp_target_port *target = ch->target;
2187 struct ib_device *dev = target->srp_host->srp_dev->dev;
2188 unsigned long flags;
2192 spin_lock_irqsave(&ch->lock, flags);
2193 ch->req_lim += req_delta;
2194 iu = __srp_get_tx_iu(ch, SRP_IU_RSP);
2195 spin_unlock_irqrestore(&ch->lock, flags);
2198 shost_printk(KERN_ERR, target->scsi_host, PFX
2199 "no IU available to send response\n");
2204 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
2205 memcpy(iu->buf, rsp, len);
2206 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
2208 err = srp_post_send(ch, iu, len);
2210 shost_printk(KERN_ERR, target->scsi_host, PFX
2211 "unable to post response: %d\n", err);
2212 srp_put_tx_iu(ch, iu, SRP_IU_RSP);
2218 static void srp_process_cred_req(struct srp_rdma_ch *ch,
2219 struct srp_cred_req *req)
2221 struct srp_cred_rsp rsp = {
2222 .opcode = SRP_CRED_RSP,
2225 s32 delta = be32_to_cpu(req->req_lim_delta);
2227 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
2228 shost_printk(KERN_ERR, ch->target->scsi_host, PFX
2229 "problems processing SRP_CRED_REQ\n");
2232 static void srp_process_aer_req(struct srp_rdma_ch *ch,
2233 struct srp_aer_req *req)
2235 struct srp_target_port *target = ch->target;
2236 struct srp_aer_rsp rsp = {
2237 .opcode = SRP_AER_RSP,
2240 s32 delta = be32_to_cpu(req->req_lim_delta);
2242 shost_printk(KERN_ERR, target->scsi_host, PFX
2243 "ignoring AER for LUN %llu\n", scsilun_to_int(&req->lun));
2245 if (srp_response_common(ch, delta, &rsp, sizeof(rsp)))
2246 shost_printk(KERN_ERR, target->scsi_host, PFX
2247 "problems processing SRP_AER_REQ\n");
2250 static void srp_recv_done(struct ib_cq *cq, struct ib_wc *wc)
2252 struct srp_iu *iu = container_of(wc->wr_cqe, struct srp_iu, cqe);
2253 struct srp_rdma_ch *ch = cq->cq_context;
2254 struct srp_target_port *target = ch->target;
2255 struct ib_device *dev = target->srp_host->srp_dev->dev;
2259 if (unlikely(wc->status != IB_WC_SUCCESS)) {
2260 srp_handle_qp_err(cq, wc, "RECV");
2264 ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_ti_iu_len,
2267 opcode = *(u8 *) iu->buf;
2270 shost_printk(KERN_ERR, target->scsi_host,
2271 PFX "recv completion, opcode 0x%02x\n", opcode);
2272 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
2273 iu->buf, wc->byte_len, true);
2278 srp_process_rsp(ch, iu->buf);
2282 srp_process_cred_req(ch, iu->buf);
2286 srp_process_aer_req(ch, iu->buf);
2290 /* XXX Handle target logout */
2291 shost_printk(KERN_WARNING, target->scsi_host,
2292 PFX "Got target logout request\n");
2296 shost_printk(KERN_WARNING, target->scsi_host,
2297 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
2301 ib_dma_sync_single_for_device(dev, iu->dma, ch->max_ti_iu_len,
2304 res = srp_post_recv(ch, iu);
2306 shost_printk(KERN_ERR, target->scsi_host,
2307 PFX "Recv failed with error code %d\n", res);
2311 * srp_tl_err_work() - handle a transport layer error
2312 * @work: Work structure embedded in an SRP target port.
2314 * Note: This function may get invoked before the rport has been created,
2315 * hence the target->rport test.
2317 static void srp_tl_err_work(struct work_struct *work)
2319 struct srp_target_port *target;
2321 target = container_of(work, struct srp_target_port, tl_err_work);
2323 srp_start_tl_fail_timers(target->rport);
2326 static void srp_handle_qp_err(struct ib_cq *cq, struct ib_wc *wc,
2329 struct srp_rdma_ch *ch = cq->cq_context;
2330 struct srp_target_port *target = ch->target;
2332 if (ch->connected && !target->qp_in_error) {
2333 shost_printk(KERN_ERR, target->scsi_host,
2334 PFX "failed %s status %s (%d) for CQE %p\n",
2335 opname, ib_wc_status_msg(wc->status), wc->status,
2337 queue_work(system_long_wq, &target->tl_err_work);
2339 target->qp_in_error = true;
2342 static int srp_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *scmnd)
2344 struct srp_target_port *target = host_to_target(shost);
2345 struct srp_rport *rport = target->rport;
2346 struct srp_rdma_ch *ch;
2347 struct srp_request *req;
2349 struct srp_cmd *cmd;
2350 struct ib_device *dev;
2351 unsigned long flags;
2355 const bool in_scsi_eh = !in_interrupt() && current == shost->ehandler;
2358 * The SCSI EH thread is the only context from which srp_queuecommand()
2359 * can get invoked for blocked devices (SDEV_BLOCK /
2360 * SDEV_CREATED_BLOCK). Avoid racing with srp_reconnect_rport() by
2361 * locking the rport mutex if invoked from inside the SCSI EH.
2364 mutex_lock(&rport->mutex);
2366 scmnd->result = srp_chkready(target->rport);
2367 if (unlikely(scmnd->result))
2370 WARN_ON_ONCE(scmnd->request->tag < 0);
2371 tag = blk_mq_unique_tag(scmnd->request);
2372 ch = &target->ch[blk_mq_unique_tag_to_hwq(tag)];
2373 idx = blk_mq_unique_tag_to_tag(tag);
2374 WARN_ONCE(idx >= target->req_ring_size, "%s: tag %#x: idx %d >= %d\n",
2375 dev_name(&shost->shost_gendev), tag, idx,
2376 target->req_ring_size);
2378 spin_lock_irqsave(&ch->lock, flags);
2379 iu = __srp_get_tx_iu(ch, SRP_IU_CMD);
2380 spin_unlock_irqrestore(&ch->lock, flags);
2385 req = &ch->req_ring[idx];
2386 dev = target->srp_host->srp_dev->dev;
2387 ib_dma_sync_single_for_cpu(dev, iu->dma, ch->max_it_iu_len,
2390 scmnd->host_scribble = (void *) req;
2393 memset(cmd, 0, sizeof *cmd);
2395 cmd->opcode = SRP_CMD;
2396 int_to_scsilun(scmnd->device->lun, &cmd->lun);
2398 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
2399 if (unlikely(scmnd->cmd_len > sizeof(cmd->cdb))) {
2400 cmd->add_cdb_len = round_up(scmnd->cmd_len - sizeof(cmd->cdb),
2402 if (WARN_ON_ONCE(cmd->add_cdb_len > SRP_MAX_ADD_CDB_LEN))
2409 len = srp_map_data(scmnd, ch, req);
2411 shost_printk(KERN_ERR, target->scsi_host,
2412 PFX "Failed to map data (%d)\n", len);
2414 * If we ran out of memory descriptors (-ENOMEM) because an
2415 * application is queuing many requests with more than
2416 * max_pages_per_mr sg-list elements, tell the SCSI mid-layer
2417 * to reduce queue depth temporarily.
2419 scmnd->result = len == -ENOMEM ?
2420 DID_OK << 16 | QUEUE_FULL << 1 : DID_ERROR << 16;
2424 ib_dma_sync_single_for_device(dev, iu->dma, ch->max_it_iu_len,
2427 if (srp_post_send(ch, iu, len)) {
2428 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
2429 scmnd->result = DID_ERROR << 16;
2437 mutex_unlock(&rport->mutex);
2442 srp_unmap_data(scmnd, ch, req);
2445 srp_put_tx_iu(ch, iu, SRP_IU_CMD);
2448 * Avoid that the loops that iterate over the request ring can
2449 * encounter a dangling SCSI command pointer.
2454 if (scmnd->result) {
2455 scmnd->scsi_done(scmnd);
2458 ret = SCSI_MLQUEUE_HOST_BUSY;
2465 * Note: the resources allocated in this function are freed in
2468 static int srp_alloc_iu_bufs(struct srp_rdma_ch *ch)
2470 struct srp_target_port *target = ch->target;
2473 ch->rx_ring = kcalloc(target->queue_size, sizeof(*ch->rx_ring),
2477 ch->tx_ring = kcalloc(target->queue_size, sizeof(*ch->tx_ring),
2482 for (i = 0; i < target->queue_size; ++i) {
2483 ch->rx_ring[i] = srp_alloc_iu(target->srp_host,
2485 GFP_KERNEL, DMA_FROM_DEVICE);
2486 if (!ch->rx_ring[i])
2490 for (i = 0; i < target->queue_size; ++i) {
2491 ch->tx_ring[i] = srp_alloc_iu(target->srp_host,
2493 GFP_KERNEL, DMA_TO_DEVICE);
2494 if (!ch->tx_ring[i])
2497 list_add(&ch->tx_ring[i]->list, &ch->free_tx);
2503 for (i = 0; i < target->queue_size; ++i) {
2504 srp_free_iu(target->srp_host, ch->rx_ring[i]);
2505 srp_free_iu(target->srp_host, ch->tx_ring[i]);
2518 static uint32_t srp_compute_rq_tmo(struct ib_qp_attr *qp_attr, int attr_mask)
2520 uint64_t T_tr_ns, max_compl_time_ms;
2521 uint32_t rq_tmo_jiffies;
2524 * According to section 11.2.4.2 in the IBTA spec (Modify Queue Pair,
2525 * table 91), both the QP timeout and the retry count have to be set
2526 * for RC QP's during the RTR to RTS transition.
2528 WARN_ON_ONCE((attr_mask & (IB_QP_TIMEOUT | IB_QP_RETRY_CNT)) !=
2529 (IB_QP_TIMEOUT | IB_QP_RETRY_CNT));
2532 * Set target->rq_tmo_jiffies to one second more than the largest time
2533 * it can take before an error completion is generated. See also
2534 * C9-140..142 in the IBTA spec for more information about how to
2535 * convert the QP Local ACK Timeout value to nanoseconds.
2537 T_tr_ns = 4096 * (1ULL << qp_attr->timeout);
2538 max_compl_time_ms = qp_attr->retry_cnt * 4 * T_tr_ns;
2539 do_div(max_compl_time_ms, NSEC_PER_MSEC);
2540 rq_tmo_jiffies = msecs_to_jiffies(max_compl_time_ms + 1000);
2542 return rq_tmo_jiffies;
2545 static void srp_cm_rep_handler(struct ib_cm_id *cm_id,
2546 const struct srp_login_rsp *lrsp,
2547 struct srp_rdma_ch *ch)
2549 struct srp_target_port *target = ch->target;
2550 struct ib_qp_attr *qp_attr = NULL;
2555 if (lrsp->opcode == SRP_LOGIN_RSP) {
2556 ch->max_ti_iu_len = be32_to_cpu(lrsp->max_ti_iu_len);
2557 ch->req_lim = be32_to_cpu(lrsp->req_lim_delta);
2558 ch->use_imm_data = lrsp->rsp_flags & SRP_LOGIN_RSP_IMMED_SUPP;
2559 ch->max_it_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt,
2561 WARN_ON_ONCE(ch->max_it_iu_len >
2562 be32_to_cpu(lrsp->max_it_iu_len));
2564 if (ch->use_imm_data)
2565 shost_printk(KERN_DEBUG, target->scsi_host,
2566 PFX "using immediate data\n");
2569 * Reserve credits for task management so we don't
2570 * bounce requests back to the SCSI mid-layer.
2572 target->scsi_host->can_queue
2573 = min(ch->req_lim - SRP_TSK_MGMT_SQ_SIZE,
2574 target->scsi_host->can_queue);
2575 target->scsi_host->cmd_per_lun
2576 = min_t(int, target->scsi_host->can_queue,
2577 target->scsi_host->cmd_per_lun);
2579 shost_printk(KERN_WARNING, target->scsi_host,
2580 PFX "Unhandled RSP opcode %#x\n", lrsp->opcode);
2586 ret = srp_alloc_iu_bufs(ch);
2591 for (i = 0; i < target->queue_size; i++) {
2592 struct srp_iu *iu = ch->rx_ring[i];
2594 ret = srp_post_recv(ch, iu);
2599 if (!target->using_rdma_cm) {
2601 qp_attr = kmalloc(sizeof(*qp_attr), GFP_KERNEL);
2605 qp_attr->qp_state = IB_QPS_RTR;
2606 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2610 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
2614 qp_attr->qp_state = IB_QPS_RTS;
2615 ret = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
2619 target->rq_tmo_jiffies = srp_compute_rq_tmo(qp_attr, attr_mask);
2621 ret = ib_modify_qp(ch->qp, qp_attr, attr_mask);
2625 ret = ib_send_cm_rtu(cm_id, NULL, 0);
2635 static void srp_ib_cm_rej_handler(struct ib_cm_id *cm_id,
2636 const struct ib_cm_event *event,
2637 struct srp_rdma_ch *ch)
2639 struct srp_target_port *target = ch->target;
2640 struct Scsi_Host *shost = target->scsi_host;
2641 struct ib_class_port_info *cpi;
2645 switch (event->param.rej_rcvd.reason) {
2646 case IB_CM_REJ_PORT_CM_REDIRECT:
2647 cpi = event->param.rej_rcvd.ari;
2648 dlid = be16_to_cpu(cpi->redirect_lid);
2649 sa_path_set_dlid(&ch->ib_cm.path, dlid);
2650 ch->ib_cm.path.pkey = cpi->redirect_pkey;
2651 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
2652 memcpy(ch->ib_cm.path.dgid.raw, cpi->redirect_gid, 16);
2654 ch->status = dlid ? SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
2657 case IB_CM_REJ_PORT_REDIRECT:
2658 if (srp_target_is_topspin(target)) {
2659 union ib_gid *dgid = &ch->ib_cm.path.dgid;
2662 * Topspin/Cisco SRP gateways incorrectly send
2663 * reject reason code 25 when they mean 24
2666 memcpy(dgid->raw, event->param.rej_rcvd.ari, 16);
2668 shost_printk(KERN_DEBUG, shost,
2669 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
2670 be64_to_cpu(dgid->global.subnet_prefix),
2671 be64_to_cpu(dgid->global.interface_id));
2673 ch->status = SRP_PORT_REDIRECT;
2675 shost_printk(KERN_WARNING, shost,
2676 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
2677 ch->status = -ECONNRESET;
2681 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
2682 shost_printk(KERN_WARNING, shost,
2683 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2684 ch->status = -ECONNRESET;
2687 case IB_CM_REJ_CONSUMER_DEFINED:
2688 opcode = *(u8 *) event->private_data;
2689 if (opcode == SRP_LOGIN_REJ) {
2690 struct srp_login_rej *rej = event->private_data;
2691 u32 reason = be32_to_cpu(rej->reason);
2693 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
2694 shost_printk(KERN_WARNING, shost,
2695 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2697 shost_printk(KERN_WARNING, shost, PFX
2698 "SRP LOGIN from %pI6 to %pI6 REJECTED, reason 0x%08x\n",
2700 target->ib_cm.orig_dgid.raw,
2703 shost_printk(KERN_WARNING, shost,
2704 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
2705 " opcode 0x%02x\n", opcode);
2706 ch->status = -ECONNRESET;
2709 case IB_CM_REJ_STALE_CONN:
2710 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
2711 ch->status = SRP_STALE_CONN;
2715 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2716 event->param.rej_rcvd.reason);
2717 ch->status = -ECONNRESET;
2721 static int srp_ib_cm_handler(struct ib_cm_id *cm_id,
2722 const struct ib_cm_event *event)
2724 struct srp_rdma_ch *ch = cm_id->context;
2725 struct srp_target_port *target = ch->target;
2728 switch (event->event) {
2729 case IB_CM_REQ_ERROR:
2730 shost_printk(KERN_DEBUG, target->scsi_host,
2731 PFX "Sending CM REQ failed\n");
2733 ch->status = -ECONNRESET;
2736 case IB_CM_REP_RECEIVED:
2738 srp_cm_rep_handler(cm_id, event->private_data, ch);
2741 case IB_CM_REJ_RECEIVED:
2742 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
2745 srp_ib_cm_rej_handler(cm_id, event, ch);
2748 case IB_CM_DREQ_RECEIVED:
2749 shost_printk(KERN_WARNING, target->scsi_host,
2750 PFX "DREQ received - connection closed\n");
2751 ch->connected = false;
2752 if (ib_send_cm_drep(cm_id, NULL, 0))
2753 shost_printk(KERN_ERR, target->scsi_host,
2754 PFX "Sending CM DREP failed\n");
2755 queue_work(system_long_wq, &target->tl_err_work);
2758 case IB_CM_TIMEWAIT_EXIT:
2759 shost_printk(KERN_ERR, target->scsi_host,
2760 PFX "connection closed\n");
2766 case IB_CM_MRA_RECEIVED:
2767 case IB_CM_DREQ_ERROR:
2768 case IB_CM_DREP_RECEIVED:
2772 shost_printk(KERN_WARNING, target->scsi_host,
2773 PFX "Unhandled CM event %d\n", event->event);
2778 complete(&ch->done);
2783 static void srp_rdma_cm_rej_handler(struct srp_rdma_ch *ch,
2784 struct rdma_cm_event *event)
2786 struct srp_target_port *target = ch->target;
2787 struct Scsi_Host *shost = target->scsi_host;
2790 switch (event->status) {
2791 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
2792 shost_printk(KERN_WARNING, shost,
2793 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
2794 ch->status = -ECONNRESET;
2797 case IB_CM_REJ_CONSUMER_DEFINED:
2798 opcode = *(u8 *) event->param.conn.private_data;
2799 if (opcode == SRP_LOGIN_REJ) {
2800 struct srp_login_rej *rej =
2801 (struct srp_login_rej *)
2802 event->param.conn.private_data;
2803 u32 reason = be32_to_cpu(rej->reason);
2805 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
2806 shost_printk(KERN_WARNING, shost,
2807 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
2809 shost_printk(KERN_WARNING, shost,
2810 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
2812 shost_printk(KERN_WARNING, shost,
2813 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED, opcode 0x%02x\n",
2816 ch->status = -ECONNRESET;
2819 case IB_CM_REJ_STALE_CONN:
2820 shost_printk(KERN_WARNING, shost,
2821 " REJ reason: stale connection\n");
2822 ch->status = SRP_STALE_CONN;
2826 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
2828 ch->status = -ECONNRESET;
2833 static int srp_rdma_cm_handler(struct rdma_cm_id *cm_id,
2834 struct rdma_cm_event *event)
2836 struct srp_rdma_ch *ch = cm_id->context;
2837 struct srp_target_port *target = ch->target;
2840 switch (event->event) {
2841 case RDMA_CM_EVENT_ADDR_RESOLVED:
2846 case RDMA_CM_EVENT_ADDR_ERROR:
2847 ch->status = -ENXIO;
2851 case RDMA_CM_EVENT_ROUTE_RESOLVED:
2856 case RDMA_CM_EVENT_ROUTE_ERROR:
2857 case RDMA_CM_EVENT_UNREACHABLE:
2858 ch->status = -EHOSTUNREACH;
2862 case RDMA_CM_EVENT_CONNECT_ERROR:
2863 shost_printk(KERN_DEBUG, target->scsi_host,
2864 PFX "Sending CM REQ failed\n");
2866 ch->status = -ECONNRESET;
2869 case RDMA_CM_EVENT_ESTABLISHED:
2871 srp_cm_rep_handler(NULL, event->param.conn.private_data, ch);
2874 case RDMA_CM_EVENT_REJECTED:
2875 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
2878 srp_rdma_cm_rej_handler(ch, event);
2881 case RDMA_CM_EVENT_DISCONNECTED:
2882 if (ch->connected) {
2883 shost_printk(KERN_WARNING, target->scsi_host,
2884 PFX "received DREQ\n");
2885 rdma_disconnect(ch->rdma_cm.cm_id);
2888 queue_work(system_long_wq, &target->tl_err_work);
2892 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
2893 shost_printk(KERN_ERR, target->scsi_host,
2894 PFX "connection closed\n");
2901 shost_printk(KERN_WARNING, target->scsi_host,
2902 PFX "Unhandled CM event %d\n", event->event);
2907 complete(&ch->done);
2913 * srp_change_queue_depth - setting device queue depth
2914 * @sdev: scsi device struct
2915 * @qdepth: requested queue depth
2917 * Returns queue depth.
2920 srp_change_queue_depth(struct scsi_device *sdev, int qdepth)
2922 if (!sdev->tagged_supported)
2924 return scsi_change_queue_depth(sdev, qdepth);
2927 static int srp_send_tsk_mgmt(struct srp_rdma_ch *ch, u64 req_tag, u64 lun,
2928 u8 func, u8 *status)
2930 struct srp_target_port *target = ch->target;
2931 struct srp_rport *rport = target->rport;
2932 struct ib_device *dev = target->srp_host->srp_dev->dev;
2934 struct srp_tsk_mgmt *tsk_mgmt;
2937 if (!ch->connected || target->qp_in_error)
2941 * Lock the rport mutex to avoid that srp_create_ch_ib() is
2942 * invoked while a task management function is being sent.
2944 mutex_lock(&rport->mutex);
2945 spin_lock_irq(&ch->lock);
2946 iu = __srp_get_tx_iu(ch, SRP_IU_TSK_MGMT);
2947 spin_unlock_irq(&ch->lock);
2950 mutex_unlock(&rport->mutex);
2957 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
2960 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
2962 tsk_mgmt->opcode = SRP_TSK_MGMT;
2963 int_to_scsilun(lun, &tsk_mgmt->lun);
2964 tsk_mgmt->tsk_mgmt_func = func;
2965 tsk_mgmt->task_tag = req_tag;
2967 spin_lock_irq(&ch->lock);
2968 ch->tsk_mgmt_tag = (ch->tsk_mgmt_tag + 1) | SRP_TAG_TSK_MGMT;
2969 tsk_mgmt->tag = ch->tsk_mgmt_tag;
2970 spin_unlock_irq(&ch->lock);
2972 init_completion(&ch->tsk_mgmt_done);
2974 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
2976 if (srp_post_send(ch, iu, sizeof(*tsk_mgmt))) {
2977 srp_put_tx_iu(ch, iu, SRP_IU_TSK_MGMT);
2978 mutex_unlock(&rport->mutex);
2982 res = wait_for_completion_timeout(&ch->tsk_mgmt_done,
2983 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS));
2984 if (res > 0 && status)
2985 *status = ch->tsk_mgmt_status;
2986 mutex_unlock(&rport->mutex);
2988 WARN_ON_ONCE(res < 0);
2990 return res > 0 ? 0 : -1;
2993 static int srp_abort(struct scsi_cmnd *scmnd)
2995 struct srp_target_port *target = host_to_target(scmnd->device->host);
2996 struct srp_request *req = (struct srp_request *) scmnd->host_scribble;
2999 struct srp_rdma_ch *ch;
3002 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
3006 tag = blk_mq_unique_tag(scmnd->request);
3007 ch_idx = blk_mq_unique_tag_to_hwq(tag);
3008 if (WARN_ON_ONCE(ch_idx >= target->ch_count))
3010 ch = &target->ch[ch_idx];
3011 if (!srp_claim_req(ch, req, NULL, scmnd))
3013 shost_printk(KERN_ERR, target->scsi_host,
3014 "Sending SRP abort for tag %#x\n", tag);
3015 if (srp_send_tsk_mgmt(ch, tag, scmnd->device->lun,
3016 SRP_TSK_ABORT_TASK, NULL) == 0)
3018 else if (target->rport->state == SRP_RPORT_LOST)
3022 if (ret == SUCCESS) {
3023 srp_free_req(ch, req, scmnd, 0);
3024 scmnd->result = DID_ABORT << 16;
3025 scmnd->scsi_done(scmnd);
3031 static int srp_reset_device(struct scsi_cmnd *scmnd)
3033 struct srp_target_port *target = host_to_target(scmnd->device->host);
3034 struct srp_rdma_ch *ch;
3038 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
3040 ch = &target->ch[0];
3041 if (srp_send_tsk_mgmt(ch, SRP_TAG_NO_REQ, scmnd->device->lun,
3042 SRP_TSK_LUN_RESET, &status))
3047 for (i = 0; i < target->ch_count; i++) {
3048 ch = &target->ch[i];
3049 for (j = 0; j < target->req_ring_size; ++j) {
3050 struct srp_request *req = &ch->req_ring[j];
3052 srp_finish_req(ch, req, scmnd->device, DID_RESET << 16);
3059 static int srp_reset_host(struct scsi_cmnd *scmnd)
3061 struct srp_target_port *target = host_to_target(scmnd->device->host);
3063 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
3065 return srp_reconnect_rport(target->rport) == 0 ? SUCCESS : FAILED;
3068 static int srp_target_alloc(struct scsi_target *starget)
3070 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
3071 struct srp_target_port *target = host_to_target(shost);
3073 if (target->target_can_queue)
3074 starget->can_queue = target->target_can_queue;
3078 static int srp_slave_alloc(struct scsi_device *sdev)
3080 struct Scsi_Host *shost = sdev->host;
3081 struct srp_target_port *target = host_to_target(shost);
3082 struct srp_device *srp_dev = target->srp_host->srp_dev;
3083 struct ib_device *ibdev = srp_dev->dev;
3085 if (!(ibdev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG))
3086 blk_queue_virt_boundary(sdev->request_queue,
3087 ~srp_dev->mr_page_mask);
3092 static int srp_slave_configure(struct scsi_device *sdev)
3094 struct Scsi_Host *shost = sdev->host;
3095 struct srp_target_port *target = host_to_target(shost);
3096 struct request_queue *q = sdev->request_queue;
3097 unsigned long timeout;
3099 if (sdev->type == TYPE_DISK) {
3100 timeout = max_t(unsigned, 30 * HZ, target->rq_tmo_jiffies);
3101 blk_queue_rq_timeout(q, timeout);
3107 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
3110 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3112 return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->id_ext));
3115 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
3118 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3120 return sprintf(buf, "0x%016llx\n", be64_to_cpu(target->ioc_guid));
3123 static ssize_t show_service_id(struct device *dev,
3124 struct device_attribute *attr, char *buf)
3126 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3128 if (target->using_rdma_cm)
3130 return sprintf(buf, "0x%016llx\n",
3131 be64_to_cpu(target->ib_cm.service_id));
3134 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
3137 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3139 if (target->using_rdma_cm)
3141 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->ib_cm.pkey));
3144 static ssize_t show_sgid(struct device *dev, struct device_attribute *attr,
3147 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3149 return sprintf(buf, "%pI6\n", target->sgid.raw);
3152 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
3155 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3156 struct srp_rdma_ch *ch = &target->ch[0];
3158 if (target->using_rdma_cm)
3160 return sprintf(buf, "%pI6\n", ch->ib_cm.path.dgid.raw);
3163 static ssize_t show_orig_dgid(struct device *dev,
3164 struct device_attribute *attr, char *buf)
3166 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3168 if (target->using_rdma_cm)
3170 return sprintf(buf, "%pI6\n", target->ib_cm.orig_dgid.raw);
3173 static ssize_t show_req_lim(struct device *dev,
3174 struct device_attribute *attr, char *buf)
3176 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3177 struct srp_rdma_ch *ch;
3178 int i, req_lim = INT_MAX;
3180 for (i = 0; i < target->ch_count; i++) {
3181 ch = &target->ch[i];
3182 req_lim = min(req_lim, ch->req_lim);
3184 return sprintf(buf, "%d\n", req_lim);
3187 static ssize_t show_zero_req_lim(struct device *dev,
3188 struct device_attribute *attr, char *buf)
3190 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3192 return sprintf(buf, "%d\n", target->zero_req_lim);
3195 static ssize_t show_local_ib_port(struct device *dev,
3196 struct device_attribute *attr, char *buf)
3198 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3200 return sprintf(buf, "%d\n", target->srp_host->port);
3203 static ssize_t show_local_ib_device(struct device *dev,
3204 struct device_attribute *attr, char *buf)
3206 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3208 return sprintf(buf, "%s\n",
3209 dev_name(&target->srp_host->srp_dev->dev->dev));
3212 static ssize_t show_ch_count(struct device *dev, struct device_attribute *attr,
3215 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3217 return sprintf(buf, "%d\n", target->ch_count);
3220 static ssize_t show_comp_vector(struct device *dev,
3221 struct device_attribute *attr, char *buf)
3223 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3225 return sprintf(buf, "%d\n", target->comp_vector);
3228 static ssize_t show_tl_retry_count(struct device *dev,
3229 struct device_attribute *attr, char *buf)
3231 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3233 return sprintf(buf, "%d\n", target->tl_retry_count);
3236 static ssize_t show_cmd_sg_entries(struct device *dev,
3237 struct device_attribute *attr, char *buf)
3239 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3241 return sprintf(buf, "%u\n", target->cmd_sg_cnt);
3244 static ssize_t show_allow_ext_sg(struct device *dev,
3245 struct device_attribute *attr, char *buf)
3247 struct srp_target_port *target = host_to_target(class_to_shost(dev));
3249 return sprintf(buf, "%s\n", target->allow_ext_sg ? "true" : "false");
3252 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
3253 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
3254 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
3255 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
3256 static DEVICE_ATTR(sgid, S_IRUGO, show_sgid, NULL);
3257 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
3258 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
3259 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
3260 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
3261 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
3262 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
3263 static DEVICE_ATTR(ch_count, S_IRUGO, show_ch_count, NULL);
3264 static DEVICE_ATTR(comp_vector, S_IRUGO, show_comp_vector, NULL);
3265 static DEVICE_ATTR(tl_retry_count, S_IRUGO, show_tl_retry_count, NULL);
3266 static DEVICE_ATTR(cmd_sg_entries, S_IRUGO, show_cmd_sg_entries, NULL);
3267 static DEVICE_ATTR(allow_ext_sg, S_IRUGO, show_allow_ext_sg, NULL);
3269 static struct device_attribute *srp_host_attrs[] = {
3272 &dev_attr_service_id,
3276 &dev_attr_orig_dgid,
3278 &dev_attr_zero_req_lim,
3279 &dev_attr_local_ib_port,
3280 &dev_attr_local_ib_device,
3282 &dev_attr_comp_vector,
3283 &dev_attr_tl_retry_count,
3284 &dev_attr_cmd_sg_entries,
3285 &dev_attr_allow_ext_sg,
3289 static struct scsi_host_template srp_template = {
3290 .module = THIS_MODULE,
3291 .name = "InfiniBand SRP initiator",
3292 .proc_name = DRV_NAME,
3293 .target_alloc = srp_target_alloc,
3294 .slave_alloc = srp_slave_alloc,
3295 .slave_configure = srp_slave_configure,
3296 .info = srp_target_info,
3297 .queuecommand = srp_queuecommand,
3298 .change_queue_depth = srp_change_queue_depth,
3299 .eh_timed_out = srp_timed_out,
3300 .eh_abort_handler = srp_abort,
3301 .eh_device_reset_handler = srp_reset_device,
3302 .eh_host_reset_handler = srp_reset_host,
3303 .skip_settle_delay = true,
3304 .sg_tablesize = SRP_DEF_SG_TABLESIZE,
3305 .can_queue = SRP_DEFAULT_CMD_SQ_SIZE,
3307 .cmd_per_lun = SRP_DEFAULT_CMD_SQ_SIZE,
3308 .shost_attrs = srp_host_attrs,
3309 .track_queue_depth = 1,
3312 static int srp_sdev_count(struct Scsi_Host *host)
3314 struct scsi_device *sdev;
3317 shost_for_each_device(sdev, host)
3325 * < 0 upon failure. Caller is responsible for SRP target port cleanup.
3326 * 0 and target->state == SRP_TARGET_REMOVED if asynchronous target port
3327 * removal has been scheduled.
3328 * 0 and target->state != SRP_TARGET_REMOVED upon success.
3330 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
3332 struct srp_rport_identifiers ids;
3333 struct srp_rport *rport;
3335 target->state = SRP_TARGET_SCANNING;
3336 sprintf(target->target_name, "SRP.T10:%016llX",
3337 be64_to_cpu(target->id_ext));
3339 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dev.parent))
3342 memcpy(ids.port_id, &target->id_ext, 8);
3343 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
3344 ids.roles = SRP_RPORT_ROLE_TARGET;
3345 rport = srp_rport_add(target->scsi_host, &ids);
3346 if (IS_ERR(rport)) {
3347 scsi_remove_host(target->scsi_host);
3348 return PTR_ERR(rport);
3351 rport->lld_data = target;
3352 target->rport = rport;
3354 spin_lock(&host->target_lock);
3355 list_add_tail(&target->list, &host->target_list);
3356 spin_unlock(&host->target_lock);
3358 scsi_scan_target(&target->scsi_host->shost_gendev,
3359 0, target->scsi_id, SCAN_WILD_CARD, SCSI_SCAN_INITIAL);
3361 if (srp_connected_ch(target) < target->ch_count ||
3362 target->qp_in_error) {
3363 shost_printk(KERN_INFO, target->scsi_host,
3364 PFX "SCSI scan failed - removing SCSI host\n");
3365 srp_queue_remove_work(target);
3369 pr_debug("%s: SCSI scan succeeded - detected %d LUNs\n",
3370 dev_name(&target->scsi_host->shost_gendev),
3371 srp_sdev_count(target->scsi_host));
3373 spin_lock_irq(&target->lock);
3374 if (target->state == SRP_TARGET_SCANNING)
3375 target->state = SRP_TARGET_LIVE;
3376 spin_unlock_irq(&target->lock);
3382 static void srp_release_dev(struct device *dev)
3384 struct srp_host *host =
3385 container_of(dev, struct srp_host, dev);
3387 complete(&host->released);
3390 static struct class srp_class = {
3391 .name = "infiniband_srp",
3392 .dev_release = srp_release_dev
3396 * srp_conn_unique() - check whether the connection to a target is unique
3398 * @target: SRP target port.
3400 static bool srp_conn_unique(struct srp_host *host,
3401 struct srp_target_port *target)
3403 struct srp_target_port *t;
3406 if (target->state == SRP_TARGET_REMOVED)
3411 spin_lock(&host->target_lock);
3412 list_for_each_entry(t, &host->target_list, list) {
3414 target->id_ext == t->id_ext &&
3415 target->ioc_guid == t->ioc_guid &&
3416 target->initiator_ext == t->initiator_ext) {
3421 spin_unlock(&host->target_lock);
3428 * Target ports are added by writing
3430 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
3431 * pkey=<P_Key>,service_id=<service ID>
3433 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,
3434 * [src=<IPv4 address>,]dest=<IPv4 address>:<port number>
3436 * to the add_target sysfs attribute.
3440 SRP_OPT_ID_EXT = 1 << 0,
3441 SRP_OPT_IOC_GUID = 1 << 1,
3442 SRP_OPT_DGID = 1 << 2,
3443 SRP_OPT_PKEY = 1 << 3,
3444 SRP_OPT_SERVICE_ID = 1 << 4,
3445 SRP_OPT_MAX_SECT = 1 << 5,
3446 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
3447 SRP_OPT_IO_CLASS = 1 << 7,
3448 SRP_OPT_INITIATOR_EXT = 1 << 8,
3449 SRP_OPT_CMD_SG_ENTRIES = 1 << 9,
3450 SRP_OPT_ALLOW_EXT_SG = 1 << 10,
3451 SRP_OPT_SG_TABLESIZE = 1 << 11,
3452 SRP_OPT_COMP_VECTOR = 1 << 12,
3453 SRP_OPT_TL_RETRY_COUNT = 1 << 13,
3454 SRP_OPT_QUEUE_SIZE = 1 << 14,
3455 SRP_OPT_IP_SRC = 1 << 15,
3456 SRP_OPT_IP_DEST = 1 << 16,
3457 SRP_OPT_TARGET_CAN_QUEUE= 1 << 17,
3460 static unsigned int srp_opt_mandatory[] = {
3471 static const match_table_t srp_opt_tokens = {
3472 { SRP_OPT_ID_EXT, "id_ext=%s" },
3473 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
3474 { SRP_OPT_DGID, "dgid=%s" },
3475 { SRP_OPT_PKEY, "pkey=%x" },
3476 { SRP_OPT_SERVICE_ID, "service_id=%s" },
3477 { SRP_OPT_MAX_SECT, "max_sect=%d" },
3478 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
3479 { SRP_OPT_TARGET_CAN_QUEUE, "target_can_queue=%d" },
3480 { SRP_OPT_IO_CLASS, "io_class=%x" },
3481 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
3482 { SRP_OPT_CMD_SG_ENTRIES, "cmd_sg_entries=%u" },
3483 { SRP_OPT_ALLOW_EXT_SG, "allow_ext_sg=%u" },
3484 { SRP_OPT_SG_TABLESIZE, "sg_tablesize=%u" },
3485 { SRP_OPT_COMP_VECTOR, "comp_vector=%u" },
3486 { SRP_OPT_TL_RETRY_COUNT, "tl_retry_count=%u" },
3487 { SRP_OPT_QUEUE_SIZE, "queue_size=%d" },
3488 { SRP_OPT_IP_SRC, "src=%s" },
3489 { SRP_OPT_IP_DEST, "dest=%s" },
3490 { SRP_OPT_ERR, NULL }
3494 * srp_parse_in - parse an IP address and port number combination
3495 * @net: [in] Network namespace.
3496 * @sa: [out] Address family, IP address and port number.
3497 * @addr_port_str: [in] IP address and port number.
3499 * Parse the following address formats:
3500 * - IPv4: <ip_address>:<port>, e.g. 1.2.3.4:5.
3501 * - IPv6: \[<ipv6_address>\]:<port>, e.g. [1::2:3%4]:5.
3503 static int srp_parse_in(struct net *net, struct sockaddr_storage *sa,
3504 const char *addr_port_str)
3506 char *addr_end, *addr = kstrdup(addr_port_str, GFP_KERNEL);
3512 port_str = strrchr(addr, ':');
3516 ret = inet_pton_with_scope(net, AF_INET, addr, port_str, sa);
3517 if (ret && addr[0]) {
3518 addr_end = addr + strlen(addr) - 1;
3519 if (addr[0] == '[' && *addr_end == ']') {
3521 ret = inet_pton_with_scope(net, AF_INET6, addr + 1,
3526 pr_debug("%s -> %pISpfsc\n", addr_port_str, sa);
3530 static int srp_parse_options(struct net *net, const char *buf,
3531 struct srp_target_port *target)
3533 char *options, *sep_opt;
3535 substring_t args[MAX_OPT_ARGS];
3536 unsigned long long ull;
3542 options = kstrdup(buf, GFP_KERNEL);
3547 while ((p = strsep(&sep_opt, ",\n")) != NULL) {
3551 token = match_token(p, srp_opt_tokens, args);
3555 case SRP_OPT_ID_EXT:
3556 p = match_strdup(args);
3561 ret = kstrtoull(p, 16, &ull);
3563 pr_warn("invalid id_ext parameter '%s'\n", p);
3567 target->id_ext = cpu_to_be64(ull);
3571 case SRP_OPT_IOC_GUID:
3572 p = match_strdup(args);
3577 ret = kstrtoull(p, 16, &ull);
3579 pr_warn("invalid ioc_guid parameter '%s'\n", p);
3583 target->ioc_guid = cpu_to_be64(ull);
3588 p = match_strdup(args);
3593 if (strlen(p) != 32) {
3594 pr_warn("bad dest GID parameter '%s'\n", p);
3599 ret = hex2bin(target->ib_cm.orig_dgid.raw, p, 16);
3606 if (match_hex(args, &token)) {
3607 pr_warn("bad P_Key parameter '%s'\n", p);
3610 target->ib_cm.pkey = cpu_to_be16(token);
3613 case SRP_OPT_SERVICE_ID:
3614 p = match_strdup(args);
3619 ret = kstrtoull(p, 16, &ull);
3621 pr_warn("bad service_id parameter '%s'\n", p);
3625 target->ib_cm.service_id = cpu_to_be64(ull);
3629 case SRP_OPT_IP_SRC:
3630 p = match_strdup(args);
3635 ret = srp_parse_in(net, &target->rdma_cm.src.ss, p);
3637 pr_warn("bad source parameter '%s'\n", p);
3641 target->rdma_cm.src_specified = true;
3645 case SRP_OPT_IP_DEST:
3646 p = match_strdup(args);
3651 ret = srp_parse_in(net, &target->rdma_cm.dst.ss, p);
3653 pr_warn("bad dest parameter '%s'\n", p);
3657 target->using_rdma_cm = true;
3661 case SRP_OPT_MAX_SECT:
3662 if (match_int(args, &token)) {
3663 pr_warn("bad max sect parameter '%s'\n", p);
3666 target->scsi_host->max_sectors = token;
3669 case SRP_OPT_QUEUE_SIZE:
3670 if (match_int(args, &token) || token < 1) {
3671 pr_warn("bad queue_size parameter '%s'\n", p);
3674 target->scsi_host->can_queue = token;
3675 target->queue_size = token + SRP_RSP_SQ_SIZE +
3676 SRP_TSK_MGMT_SQ_SIZE;
3677 if (!(opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
3678 target->scsi_host->cmd_per_lun = token;
3681 case SRP_OPT_MAX_CMD_PER_LUN:
3682 if (match_int(args, &token) || token < 1) {
3683 pr_warn("bad max cmd_per_lun parameter '%s'\n",
3687 target->scsi_host->cmd_per_lun = token;
3690 case SRP_OPT_TARGET_CAN_QUEUE:
3691 if (match_int(args, &token) || token < 1) {
3692 pr_warn("bad max target_can_queue parameter '%s'\n",
3696 target->target_can_queue = token;
3699 case SRP_OPT_IO_CLASS:
3700 if (match_hex(args, &token)) {
3701 pr_warn("bad IO class parameter '%s'\n", p);
3704 if (token != SRP_REV10_IB_IO_CLASS &&
3705 token != SRP_REV16A_IB_IO_CLASS) {
3706 pr_warn("unknown IO class parameter value %x specified (use %x or %x).\n",
3707 token, SRP_REV10_IB_IO_CLASS,
3708 SRP_REV16A_IB_IO_CLASS);
3711 target->io_class = token;
3714 case SRP_OPT_INITIATOR_EXT:
3715 p = match_strdup(args);
3720 ret = kstrtoull(p, 16, &ull);
3722 pr_warn("bad initiator_ext value '%s'\n", p);
3726 target->initiator_ext = cpu_to_be64(ull);
3730 case SRP_OPT_CMD_SG_ENTRIES:
3731 if (match_int(args, &token) || token < 1 || token > 255) {
3732 pr_warn("bad max cmd_sg_entries parameter '%s'\n",
3736 target->cmd_sg_cnt = token;
3739 case SRP_OPT_ALLOW_EXT_SG:
3740 if (match_int(args, &token)) {
3741 pr_warn("bad allow_ext_sg parameter '%s'\n", p);
3744 target->allow_ext_sg = !!token;
3747 case SRP_OPT_SG_TABLESIZE:
3748 if (match_int(args, &token) || token < 1 ||
3749 token > SG_MAX_SEGMENTS) {
3750 pr_warn("bad max sg_tablesize parameter '%s'\n",
3754 target->sg_tablesize = token;
3757 case SRP_OPT_COMP_VECTOR:
3758 if (match_int(args, &token) || token < 0) {
3759 pr_warn("bad comp_vector parameter '%s'\n", p);
3762 target->comp_vector = token;
3765 case SRP_OPT_TL_RETRY_COUNT:
3766 if (match_int(args, &token) || token < 2 || token > 7) {
3767 pr_warn("bad tl_retry_count parameter '%s' (must be a number between 2 and 7)\n",
3771 target->tl_retry_count = token;
3775 pr_warn("unknown parameter or missing value '%s' in target creation request\n",
3781 for (i = 0; i < ARRAY_SIZE(srp_opt_mandatory); i++) {
3782 if ((opt_mask & srp_opt_mandatory[i]) == srp_opt_mandatory[i]) {
3788 pr_warn("target creation request is missing one or more parameters\n");
3790 if (target->scsi_host->cmd_per_lun > target->scsi_host->can_queue
3791 && (opt_mask & SRP_OPT_MAX_CMD_PER_LUN))
3792 pr_warn("cmd_per_lun = %d > queue_size = %d\n",
3793 target->scsi_host->cmd_per_lun,
3794 target->scsi_host->can_queue);
3801 static ssize_t srp_create_target(struct device *dev,
3802 struct device_attribute *attr,
3803 const char *buf, size_t count)
3805 struct srp_host *host =
3806 container_of(dev, struct srp_host, dev);
3807 struct Scsi_Host *target_host;
3808 struct srp_target_port *target;
3809 struct srp_rdma_ch *ch;
3810 struct srp_device *srp_dev = host->srp_dev;
3811 struct ib_device *ibdev = srp_dev->dev;
3812 int ret, node_idx, node, cpu, i;
3813 unsigned int max_sectors_per_mr, mr_per_cmd = 0;
3814 bool multich = false;
3815 uint32_t max_iu_len;
3817 target_host = scsi_host_alloc(&srp_template,
3818 sizeof (struct srp_target_port));
3822 target_host->transportt = ib_srp_transport_template;
3823 target_host->max_channel = 0;
3824 target_host->max_id = 1;
3825 target_host->max_lun = -1LL;
3826 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
3828 target = host_to_target(target_host);
3830 target->net = kobj_ns_grab_current(KOBJ_NS_TYPE_NET);
3831 target->io_class = SRP_REV16A_IB_IO_CLASS;
3832 target->scsi_host = target_host;
3833 target->srp_host = host;
3834 target->lkey = host->srp_dev->pd->local_dma_lkey;
3835 target->global_rkey = host->srp_dev->global_rkey;
3836 target->cmd_sg_cnt = cmd_sg_entries;
3837 target->sg_tablesize = indirect_sg_entries ? : cmd_sg_entries;
3838 target->allow_ext_sg = allow_ext_sg;
3839 target->tl_retry_count = 7;
3840 target->queue_size = SRP_DEFAULT_QUEUE_SIZE;
3843 * Avoid that the SCSI host can be removed by srp_remove_target()
3844 * before this function returns.
3846 scsi_host_get(target->scsi_host);
3848 ret = mutex_lock_interruptible(&host->add_target_mutex);
3852 ret = srp_parse_options(target->net, buf, target);
3856 target->req_ring_size = target->queue_size - SRP_TSK_MGMT_SQ_SIZE;
3858 if (!srp_conn_unique(target->srp_host, target)) {
3859 if (target->using_rdma_cm) {
3860 shost_printk(KERN_INFO, target->scsi_host,
3861 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;dest=%pIS\n",
3862 be64_to_cpu(target->id_ext),
3863 be64_to_cpu(target->ioc_guid),
3864 &target->rdma_cm.dst);
3866 shost_printk(KERN_INFO, target->scsi_host,
3867 PFX "Already connected to target port with id_ext=%016llx;ioc_guid=%016llx;initiator_ext=%016llx\n",
3868 be64_to_cpu(target->id_ext),
3869 be64_to_cpu(target->ioc_guid),
3870 be64_to_cpu(target->initiator_ext));
3876 if (!srp_dev->has_fmr && !srp_dev->has_fr && !target->allow_ext_sg &&
3877 target->cmd_sg_cnt < target->sg_tablesize) {
3878 pr_warn("No MR pool and no external indirect descriptors, limiting sg_tablesize to cmd_sg_cnt\n");
3879 target->sg_tablesize = target->cmd_sg_cnt;
3882 if (srp_dev->use_fast_reg || srp_dev->use_fmr) {
3883 bool gaps_reg = (ibdev->attrs.device_cap_flags &
3884 IB_DEVICE_SG_GAPS_REG);
3886 max_sectors_per_mr = srp_dev->max_pages_per_mr <<
3887 (ilog2(srp_dev->mr_page_size) - 9);
3890 * FR and FMR can only map one HCA page per entry. If
3891 * the start address is not aligned on a HCA page
3892 * boundary two entries will be used for the head and
3893 * the tail although these two entries combined
3894 * contain at most one HCA page of data. Hence the "+
3895 * 1" in the calculation below.
3897 * The indirect data buffer descriptor is contiguous
3898 * so the memory for that buffer will only be
3899 * registered if register_always is true. Hence add
3900 * one to mr_per_cmd if register_always has been set.
3902 mr_per_cmd = register_always +
3903 (target->scsi_host->max_sectors + 1 +
3904 max_sectors_per_mr - 1) / max_sectors_per_mr;
3906 mr_per_cmd = register_always +
3907 (target->sg_tablesize +
3908 srp_dev->max_pages_per_mr - 1) /
3909 srp_dev->max_pages_per_mr;
3911 pr_debug("max_sectors = %u; max_pages_per_mr = %u; mr_page_size = %u; max_sectors_per_mr = %u; mr_per_cmd = %u\n",
3912 target->scsi_host->max_sectors, srp_dev->max_pages_per_mr, srp_dev->mr_page_size,
3913 max_sectors_per_mr, mr_per_cmd);
3916 target_host->sg_tablesize = target->sg_tablesize;
3917 target->mr_pool_size = target->scsi_host->can_queue * mr_per_cmd;
3918 target->mr_per_cmd = mr_per_cmd;
3919 target->indirect_size = target->sg_tablesize *
3920 sizeof (struct srp_direct_buf);
3921 max_iu_len = srp_max_it_iu_len(target->cmd_sg_cnt, srp_use_imm_data);
3923 INIT_WORK(&target->tl_err_work, srp_tl_err_work);
3924 INIT_WORK(&target->remove_work, srp_remove_work);
3925 spin_lock_init(&target->lock);
3926 ret = rdma_query_gid(ibdev, host->port, 0, &target->sgid);
3931 target->ch_count = max_t(unsigned, num_online_nodes(),
3933 min(4 * num_online_nodes(),
3934 ibdev->num_comp_vectors),
3935 num_online_cpus()));
3936 target->ch = kcalloc(target->ch_count, sizeof(*target->ch),
3942 for_each_online_node(node) {
3943 const int ch_start = (node_idx * target->ch_count /
3944 num_online_nodes());
3945 const int ch_end = ((node_idx + 1) * target->ch_count /
3946 num_online_nodes());
3947 const int cv_start = node_idx * ibdev->num_comp_vectors /
3949 const int cv_end = (node_idx + 1) * ibdev->num_comp_vectors /
3953 for_each_online_cpu(cpu) {
3954 if (cpu_to_node(cpu) != node)
3956 if (ch_start + cpu_idx >= ch_end)
3958 ch = &target->ch[ch_start + cpu_idx];
3959 ch->target = target;
3960 ch->comp_vector = cv_start == cv_end ? cv_start :
3961 cv_start + cpu_idx % (cv_end - cv_start);
3962 spin_lock_init(&ch->lock);
3963 INIT_LIST_HEAD(&ch->free_tx);
3964 ret = srp_new_cm_id(ch);
3966 goto err_disconnect;
3968 ret = srp_create_ch_ib(ch);
3970 goto err_disconnect;
3972 ret = srp_alloc_req_data(ch);
3974 goto err_disconnect;
3976 ret = srp_connect_ch(ch, max_iu_len, multich);
3980 if (target->using_rdma_cm)
3981 snprintf(dst, sizeof(dst), "%pIS",
3982 &target->rdma_cm.dst);
3984 snprintf(dst, sizeof(dst), "%pI6",
3985 target->ib_cm.orig_dgid.raw);
3986 shost_printk(KERN_ERR, target->scsi_host,
3987 PFX "Connection %d/%d to %s failed\n",
3989 target->ch_count, dst);
3990 if (node_idx == 0 && cpu_idx == 0) {
3993 srp_free_ch_ib(target, ch);
3994 srp_free_req_data(target, ch);
3995 target->ch_count = ch - target->ch;
4007 target->scsi_host->nr_hw_queues = target->ch_count;
4009 ret = srp_add_target(host, target);
4011 goto err_disconnect;
4013 if (target->state != SRP_TARGET_REMOVED) {
4014 if (target->using_rdma_cm) {
4015 shost_printk(KERN_DEBUG, target->scsi_host, PFX
4016 "new target: id_ext %016llx ioc_guid %016llx sgid %pI6 dest %pIS\n",
4017 be64_to_cpu(target->id_ext),
4018 be64_to_cpu(target->ioc_guid),
4019 target->sgid.raw, &target->rdma_cm.dst);
4021 shost_printk(KERN_DEBUG, target->scsi_host, PFX
4022 "new target: id_ext %016llx ioc_guid %016llx pkey %04x service_id %016llx sgid %pI6 dgid %pI6\n",
4023 be64_to_cpu(target->id_ext),
4024 be64_to_cpu(target->ioc_guid),
4025 be16_to_cpu(target->ib_cm.pkey),
4026 be64_to_cpu(target->ib_cm.service_id),
4028 target->ib_cm.orig_dgid.raw);
4035 mutex_unlock(&host->add_target_mutex);
4038 scsi_host_put(target->scsi_host);
4041 * If a call to srp_remove_target() has not been scheduled,
4042 * drop the network namespace reference now that was obtained
4043 * earlier in this function.
4045 if (target->state != SRP_TARGET_REMOVED)
4046 kobj_ns_drop(KOBJ_NS_TYPE_NET, target->net);
4047 scsi_host_put(target->scsi_host);
4053 srp_disconnect_target(target);
4056 for (i = 0; i < target->ch_count; i++) {
4057 ch = &target->ch[i];
4058 srp_free_ch_ib(target, ch);
4059 srp_free_req_data(target, ch);
4066 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
4068 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
4071 struct srp_host *host = container_of(dev, struct srp_host, dev);
4073 return sprintf(buf, "%s\n", dev_name(&host->srp_dev->dev->dev));
4076 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
4078 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
4081 struct srp_host *host = container_of(dev, struct srp_host, dev);
4083 return sprintf(buf, "%d\n", host->port);
4086 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
4088 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
4090 struct srp_host *host;
4092 host = kzalloc(sizeof *host, GFP_KERNEL);
4096 INIT_LIST_HEAD(&host->target_list);
4097 spin_lock_init(&host->target_lock);
4098 init_completion(&host->released);
4099 mutex_init(&host->add_target_mutex);
4100 host->srp_dev = device;
4103 host->dev.class = &srp_class;
4104 host->dev.parent = device->dev->dev.parent;
4105 dev_set_name(&host->dev, "srp-%s-%d", dev_name(&device->dev->dev),
4108 if (device_register(&host->dev))
4110 if (device_create_file(&host->dev, &dev_attr_add_target))
4112 if (device_create_file(&host->dev, &dev_attr_ibdev))
4114 if (device_create_file(&host->dev, &dev_attr_port))
4120 device_unregister(&host->dev);
4128 static void srp_add_one(struct ib_device *device)
4130 struct srp_device *srp_dev;
4131 struct ib_device_attr *attr = &device->attrs;
4132 struct srp_host *host;
4133 int mr_page_shift, p;
4134 u64 max_pages_per_mr;
4135 unsigned int flags = 0;
4137 srp_dev = kzalloc(sizeof(*srp_dev), GFP_KERNEL);
4142 * Use the smallest page size supported by the HCA, down to a
4143 * minimum of 4096 bytes. We're unlikely to build large sglists
4144 * out of smaller entries.
4146 mr_page_shift = max(12, ffs(attr->page_size_cap) - 1);
4147 srp_dev->mr_page_size = 1 << mr_page_shift;
4148 srp_dev->mr_page_mask = ~((u64) srp_dev->mr_page_size - 1);
4149 max_pages_per_mr = attr->max_mr_size;
4150 do_div(max_pages_per_mr, srp_dev->mr_page_size);
4151 pr_debug("%s: %llu / %u = %llu <> %u\n", __func__,
4152 attr->max_mr_size, srp_dev->mr_page_size,
4153 max_pages_per_mr, SRP_MAX_PAGES_PER_MR);
4154 srp_dev->max_pages_per_mr = min_t(u64, SRP_MAX_PAGES_PER_MR,
4157 srp_dev->has_fmr = (device->ops.alloc_fmr &&
4158 device->ops.dealloc_fmr &&
4159 device->ops.map_phys_fmr &&
4160 device->ops.unmap_fmr);
4161 srp_dev->has_fr = (attr->device_cap_flags &
4162 IB_DEVICE_MEM_MGT_EXTENSIONS);
4163 if (!never_register && !srp_dev->has_fmr && !srp_dev->has_fr) {
4164 dev_warn(&device->dev, "neither FMR nor FR is supported\n");
4165 } else if (!never_register &&
4166 attr->max_mr_size >= 2 * srp_dev->mr_page_size) {
4167 srp_dev->use_fast_reg = (srp_dev->has_fr &&
4168 (!srp_dev->has_fmr || prefer_fr));
4169 srp_dev->use_fmr = !srp_dev->use_fast_reg && srp_dev->has_fmr;
4172 if (never_register || !register_always ||
4173 (!srp_dev->has_fmr && !srp_dev->has_fr))
4174 flags |= IB_PD_UNSAFE_GLOBAL_RKEY;
4176 if (srp_dev->use_fast_reg) {
4177 srp_dev->max_pages_per_mr =
4178 min_t(u32, srp_dev->max_pages_per_mr,
4179 attr->max_fast_reg_page_list_len);
4181 srp_dev->mr_max_size = srp_dev->mr_page_size *
4182 srp_dev->max_pages_per_mr;
4183 pr_debug("%s: mr_page_shift = %d, device->max_mr_size = %#llx, device->max_fast_reg_page_list_len = %u, max_pages_per_mr = %d, mr_max_size = %#x\n",
4184 dev_name(&device->dev), mr_page_shift, attr->max_mr_size,
4185 attr->max_fast_reg_page_list_len,
4186 srp_dev->max_pages_per_mr, srp_dev->mr_max_size);
4188 INIT_LIST_HEAD(&srp_dev->dev_list);
4190 srp_dev->dev = device;
4191 srp_dev->pd = ib_alloc_pd(device, flags);
4192 if (IS_ERR(srp_dev->pd))
4195 if (flags & IB_PD_UNSAFE_GLOBAL_RKEY) {
4196 srp_dev->global_rkey = srp_dev->pd->unsafe_global_rkey;
4197 WARN_ON_ONCE(srp_dev->global_rkey == 0);
4200 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
4201 host = srp_add_port(srp_dev, p);
4203 list_add_tail(&host->list, &srp_dev->dev_list);
4206 ib_set_client_data(device, &srp_client, srp_dev);
4213 static void srp_remove_one(struct ib_device *device, void *client_data)
4215 struct srp_device *srp_dev;
4216 struct srp_host *host, *tmp_host;
4217 struct srp_target_port *target;
4219 srp_dev = client_data;
4223 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
4224 device_unregister(&host->dev);
4226 * Wait for the sysfs entry to go away, so that no new
4227 * target ports can be created.
4229 wait_for_completion(&host->released);
4232 * Remove all target ports.
4234 spin_lock(&host->target_lock);
4235 list_for_each_entry(target, &host->target_list, list)
4236 srp_queue_remove_work(target);
4237 spin_unlock(&host->target_lock);
4240 * Wait for tl_err and target port removal tasks.
4242 flush_workqueue(system_long_wq);
4243 flush_workqueue(srp_remove_wq);
4248 ib_dealloc_pd(srp_dev->pd);
4253 static struct srp_function_template ib_srp_transport_functions = {
4254 .has_rport_state = true,
4255 .reset_timer_if_blocked = true,
4256 .reconnect_delay = &srp_reconnect_delay,
4257 .fast_io_fail_tmo = &srp_fast_io_fail_tmo,
4258 .dev_loss_tmo = &srp_dev_loss_tmo,
4259 .reconnect = srp_rport_reconnect,
4260 .rport_delete = srp_rport_delete,
4261 .terminate_rport_io = srp_terminate_io,
4264 static int __init srp_init_module(void)
4268 BUILD_BUG_ON(sizeof(struct srp_imm_buf) != 4);
4269 BUILD_BUG_ON(sizeof(struct srp_login_req) != 64);
4270 BUILD_BUG_ON(sizeof(struct srp_login_req_rdma) != 56);
4271 BUILD_BUG_ON(sizeof(struct srp_cmd) != 48);
4273 if (srp_sg_tablesize) {
4274 pr_warn("srp_sg_tablesize is deprecated, please use cmd_sg_entries\n");
4275 if (!cmd_sg_entries)
4276 cmd_sg_entries = srp_sg_tablesize;
4279 if (!cmd_sg_entries)
4280 cmd_sg_entries = SRP_DEF_SG_TABLESIZE;
4282 if (cmd_sg_entries > 255) {
4283 pr_warn("Clamping cmd_sg_entries to 255\n");
4284 cmd_sg_entries = 255;
4287 if (!indirect_sg_entries)
4288 indirect_sg_entries = cmd_sg_entries;
4289 else if (indirect_sg_entries < cmd_sg_entries) {
4290 pr_warn("Bumping up indirect_sg_entries to match cmd_sg_entries (%u)\n",
4292 indirect_sg_entries = cmd_sg_entries;
4295 if (indirect_sg_entries > SG_MAX_SEGMENTS) {
4296 pr_warn("Clamping indirect_sg_entries to %u\n",
4298 indirect_sg_entries = SG_MAX_SEGMENTS;
4301 srp_remove_wq = create_workqueue("srp_remove");
4302 if (!srp_remove_wq) {
4308 ib_srp_transport_template =
4309 srp_attach_transport(&ib_srp_transport_functions);
4310 if (!ib_srp_transport_template)
4313 ret = class_register(&srp_class);
4315 pr_err("couldn't register class infiniband_srp\n");
4319 ib_sa_register_client(&srp_sa_client);
4321 ret = ib_register_client(&srp_client);
4323 pr_err("couldn't register IB client\n");
4331 ib_sa_unregister_client(&srp_sa_client);
4332 class_unregister(&srp_class);
4335 srp_release_transport(ib_srp_transport_template);
4338 destroy_workqueue(srp_remove_wq);
4342 static void __exit srp_cleanup_module(void)
4344 ib_unregister_client(&srp_client);
4345 ib_sa_unregister_client(&srp_sa_client);
4346 class_unregister(&srp_class);
4347 srp_release_transport(ib_srp_transport_template);
4348 destroy_workqueue(srp_remove_wq);
4351 module_init(srp_init_module);
4352 module_exit(srp_cleanup_module);