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 #include <linux/module.h>
34 #include <linux/init.h>
35 #include <linux/slab.h>
36 #include <linux/err.h>
37 #include <linux/string.h>
38 #include <linux/parser.h>
39 #include <linux/random.h>
40 #include <linux/jiffies.h>
42 #include <asm/atomic.h>
44 #include <scsi/scsi.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_dbg.h>
48 #include <scsi/scsi_transport_srp.h>
52 #define DRV_NAME "ib_srp"
53 #define PFX DRV_NAME ": "
54 #define DRV_VERSION "0.2"
55 #define DRV_RELDATE "November 1, 2005"
57 MODULE_AUTHOR("Roland Dreier");
58 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
59 "v" DRV_VERSION " (" DRV_RELDATE ")");
60 MODULE_LICENSE("Dual BSD/GPL");
62 static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
63 static int srp_max_iu_len;
65 module_param(srp_sg_tablesize, int, 0444);
66 MODULE_PARM_DESC(srp_sg_tablesize,
67 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
69 static int topspin_workarounds = 1;
71 module_param(topspin_workarounds, int, 0444);
72 MODULE_PARM_DESC(topspin_workarounds,
73 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
75 static int mellanox_workarounds = 1;
77 module_param(mellanox_workarounds, int, 0444);
78 MODULE_PARM_DESC(mellanox_workarounds,
79 "Enable workarounds for Mellanox SRP target bugs if != 0");
81 static void srp_add_one(struct ib_device *device);
82 static void srp_remove_one(struct ib_device *device);
83 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
84 static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
85 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
87 static struct scsi_transport_template *ib_srp_transport_template;
89 static struct ib_client srp_client = {
92 .remove = srp_remove_one
95 static struct ib_sa_client srp_sa_client;
97 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
99 return (struct srp_target_port *) host->hostdata;
102 static const char *srp_target_info(struct Scsi_Host *host)
104 return host_to_target(host)->target_name;
107 static int srp_target_is_topspin(struct srp_target_port *target)
109 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
110 static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
112 return topspin_workarounds &&
113 (!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
114 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
117 static int srp_target_is_mellanox(struct srp_target_port *target)
119 static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
121 return mellanox_workarounds &&
122 !memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
125 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
127 enum dma_data_direction direction)
131 iu = kmalloc(sizeof *iu, gfp_mask);
135 iu->buf = kzalloc(size, gfp_mask);
139 iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
141 if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
145 iu->direction = direction;
157 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
162 ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
168 static void srp_qp_event(struct ib_event *event, void *context)
170 printk(KERN_ERR PFX "QP event %d\n", event->event);
173 static int srp_init_qp(struct srp_target_port *target,
176 struct ib_qp_attr *attr;
179 attr = kmalloc(sizeof *attr, GFP_KERNEL);
183 ret = ib_find_pkey(target->srp_host->srp_dev->dev,
184 target->srp_host->port,
185 be16_to_cpu(target->path.pkey),
190 attr->qp_state = IB_QPS_INIT;
191 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
192 IB_ACCESS_REMOTE_WRITE);
193 attr->port_num = target->srp_host->port;
195 ret = ib_modify_qp(qp, attr,
206 static int srp_new_cm_id(struct srp_target_port *target)
208 struct ib_cm_id *new_cm_id;
210 new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
211 srp_cm_handler, target);
212 if (IS_ERR(new_cm_id))
213 return PTR_ERR(new_cm_id);
216 ib_destroy_cm_id(target->cm_id);
217 target->cm_id = new_cm_id;
222 static int srp_create_target_ib(struct srp_target_port *target)
224 struct ib_qp_init_attr *init_attr;
227 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
231 target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
232 srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
233 if (IS_ERR(target->recv_cq)) {
234 ret = PTR_ERR(target->recv_cq);
238 target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
239 srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
240 if (IS_ERR(target->send_cq)) {
241 ret = PTR_ERR(target->send_cq);
245 ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
247 init_attr->event_handler = srp_qp_event;
248 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
249 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
250 init_attr->cap.max_recv_sge = 1;
251 init_attr->cap.max_send_sge = 1;
252 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
253 init_attr->qp_type = IB_QPT_RC;
254 init_attr->send_cq = target->send_cq;
255 init_attr->recv_cq = target->recv_cq;
257 target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
258 if (IS_ERR(target->qp)) {
259 ret = PTR_ERR(target->qp);
263 ret = srp_init_qp(target, target->qp);
271 ib_destroy_qp(target->qp);
274 ib_destroy_cq(target->send_cq);
277 ib_destroy_cq(target->recv_cq);
284 static void srp_free_target_ib(struct srp_target_port *target)
288 ib_destroy_qp(target->qp);
289 ib_destroy_cq(target->send_cq);
290 ib_destroy_cq(target->recv_cq);
292 for (i = 0; i < SRP_RQ_SIZE; ++i)
293 srp_free_iu(target->srp_host, target->rx_ring[i]);
294 for (i = 0; i < SRP_SQ_SIZE; ++i)
295 srp_free_iu(target->srp_host, target->tx_ring[i]);
298 static void srp_path_rec_completion(int status,
299 struct ib_sa_path_rec *pathrec,
302 struct srp_target_port *target = target_ptr;
304 target->status = status;
306 shost_printk(KERN_ERR, target->scsi_host,
307 PFX "Got failed path rec status %d\n", status);
309 target->path = *pathrec;
310 complete(&target->done);
313 static int srp_lookup_path(struct srp_target_port *target)
315 target->path.numb_path = 1;
317 init_completion(&target->done);
319 target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
320 target->srp_host->srp_dev->dev,
321 target->srp_host->port,
323 IB_SA_PATH_REC_SERVICE_ID |
324 IB_SA_PATH_REC_DGID |
325 IB_SA_PATH_REC_SGID |
326 IB_SA_PATH_REC_NUMB_PATH |
328 SRP_PATH_REC_TIMEOUT_MS,
330 srp_path_rec_completion,
331 target, &target->path_query);
332 if (target->path_query_id < 0)
333 return target->path_query_id;
335 wait_for_completion(&target->done);
337 if (target->status < 0)
338 shost_printk(KERN_WARNING, target->scsi_host,
339 PFX "Path record query failed\n");
341 return target->status;
344 static int srp_send_req(struct srp_target_port *target)
347 struct ib_cm_req_param param;
348 struct srp_login_req priv;
352 req = kzalloc(sizeof *req, GFP_KERNEL);
356 req->param.primary_path = &target->path;
357 req->param.alternate_path = NULL;
358 req->param.service_id = target->service_id;
359 req->param.qp_num = target->qp->qp_num;
360 req->param.qp_type = target->qp->qp_type;
361 req->param.private_data = &req->priv;
362 req->param.private_data_len = sizeof req->priv;
363 req->param.flow_control = 1;
365 get_random_bytes(&req->param.starting_psn, 4);
366 req->param.starting_psn &= 0xffffff;
369 * Pick some arbitrary defaults here; we could make these
370 * module parameters if anyone cared about setting them.
372 req->param.responder_resources = 4;
373 req->param.remote_cm_response_timeout = 20;
374 req->param.local_cm_response_timeout = 20;
375 req->param.retry_count = 7;
376 req->param.rnr_retry_count = 7;
377 req->param.max_cm_retries = 15;
379 req->priv.opcode = SRP_LOGIN_REQ;
381 req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
382 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
383 SRP_BUF_FORMAT_INDIRECT);
385 * In the published SRP specification (draft rev. 16a), the
386 * port identifier format is 8 bytes of ID extension followed
387 * by 8 bytes of GUID. Older drafts put the two halves in the
388 * opposite order, so that the GUID comes first.
390 * Targets conforming to these obsolete drafts can be
391 * recognized by the I/O Class they report.
393 if (target->io_class == SRP_REV10_IB_IO_CLASS) {
394 memcpy(req->priv.initiator_port_id,
395 &target->path.sgid.global.interface_id, 8);
396 memcpy(req->priv.initiator_port_id + 8,
397 &target->initiator_ext, 8);
398 memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
399 memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
401 memcpy(req->priv.initiator_port_id,
402 &target->initiator_ext, 8);
403 memcpy(req->priv.initiator_port_id + 8,
404 &target->path.sgid.global.interface_id, 8);
405 memcpy(req->priv.target_port_id, &target->id_ext, 8);
406 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
410 * Topspin/Cisco SRP targets will reject our login unless we
411 * zero out the first 8 bytes of our initiator port ID and set
412 * the second 8 bytes to the local node GUID.
414 if (srp_target_is_topspin(target)) {
415 shost_printk(KERN_DEBUG, target->scsi_host,
416 PFX "Topspin/Cisco initiator port ID workaround "
417 "activated for target GUID %016llx\n",
418 (unsigned long long) be64_to_cpu(target->ioc_guid));
419 memset(req->priv.initiator_port_id, 0, 8);
420 memcpy(req->priv.initiator_port_id + 8,
421 &target->srp_host->srp_dev->dev->node_guid, 8);
424 status = ib_send_cm_req(target->cm_id, &req->param);
431 static void srp_disconnect_target(struct srp_target_port *target)
433 /* XXX should send SRP_I_LOGOUT request */
435 init_completion(&target->done);
436 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
437 shost_printk(KERN_DEBUG, target->scsi_host,
438 PFX "Sending CM DREQ failed\n");
441 wait_for_completion(&target->done);
444 static void srp_remove_work(struct work_struct *work)
446 struct srp_target_port *target =
447 container_of(work, struct srp_target_port, work);
449 spin_lock_irq(target->scsi_host->host_lock);
450 if (target->state != SRP_TARGET_DEAD) {
451 spin_unlock_irq(target->scsi_host->host_lock);
454 target->state = SRP_TARGET_REMOVED;
455 spin_unlock_irq(target->scsi_host->host_lock);
457 spin_lock(&target->srp_host->target_lock);
458 list_del(&target->list);
459 spin_unlock(&target->srp_host->target_lock);
461 srp_remove_host(target->scsi_host);
462 scsi_remove_host(target->scsi_host);
463 ib_destroy_cm_id(target->cm_id);
464 srp_free_target_ib(target);
465 scsi_host_put(target->scsi_host);
468 static int srp_connect_target(struct srp_target_port *target)
473 ret = srp_lookup_path(target);
478 init_completion(&target->done);
479 ret = srp_send_req(target);
482 wait_for_completion(&target->done);
485 * The CM event handling code will set status to
486 * SRP_PORT_REDIRECT if we get a port redirect REJ
487 * back, or SRP_DLID_REDIRECT if we get a lid/qp
490 switch (target->status) {
494 case SRP_PORT_REDIRECT:
495 ret = srp_lookup_path(target);
500 case SRP_DLID_REDIRECT:
504 /* Our current CM id was stale, and is now in timewait.
505 * Try to reconnect with a new one.
507 if (!retries-- || srp_new_cm_id(target)) {
508 shost_printk(KERN_ERR, target->scsi_host, PFX
509 "giving up on stale connection\n");
510 target->status = -ECONNRESET;
511 return target->status;
514 shost_printk(KERN_ERR, target->scsi_host, PFX
515 "retrying stale connection\n");
519 return target->status;
524 static void srp_unmap_data(struct scsi_cmnd *scmnd,
525 struct srp_target_port *target,
526 struct srp_request *req)
528 if (!scsi_sglist(scmnd) ||
529 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
530 scmnd->sc_data_direction != DMA_FROM_DEVICE))
534 ib_fmr_pool_unmap(req->fmr);
538 ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
539 scsi_sg_count(scmnd), scmnd->sc_data_direction);
542 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
544 srp_unmap_data(req->scmnd, target, req);
545 list_move_tail(&req->list, &target->free_reqs);
548 static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
550 req->scmnd->result = DID_RESET << 16;
551 req->scmnd->scsi_done(req->scmnd);
552 srp_remove_req(target, req);
555 static int srp_reconnect_target(struct srp_target_port *target)
557 struct ib_qp_attr qp_attr;
558 struct srp_request *req, *tmp;
562 spin_lock_irq(target->scsi_host->host_lock);
563 if (target->state != SRP_TARGET_LIVE) {
564 spin_unlock_irq(target->scsi_host->host_lock);
567 target->state = SRP_TARGET_CONNECTING;
568 spin_unlock_irq(target->scsi_host->host_lock);
570 srp_disconnect_target(target);
572 * Now get a new local CM ID so that we avoid confusing the
573 * target in case things are really fouled up.
575 ret = srp_new_cm_id(target);
579 qp_attr.qp_state = IB_QPS_RESET;
580 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
584 ret = srp_init_qp(target, target->qp);
588 while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
590 while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
593 spin_lock_irq(target->scsi_host->host_lock);
594 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
595 srp_reset_req(target, req);
596 spin_unlock_irq(target->scsi_host->host_lock);
602 target->qp_in_error = 0;
603 ret = srp_connect_target(target);
607 spin_lock_irq(target->scsi_host->host_lock);
608 if (target->state == SRP_TARGET_CONNECTING) {
610 target->state = SRP_TARGET_LIVE;
613 spin_unlock_irq(target->scsi_host->host_lock);
618 shost_printk(KERN_ERR, target->scsi_host,
619 PFX "reconnect failed (%d), removing target port.\n", ret);
622 * We couldn't reconnect, so kill our target port off.
623 * However, we have to defer the real removal because we might
624 * be in the context of the SCSI error handler now, which
625 * would deadlock if we call scsi_remove_host().
627 spin_lock_irq(target->scsi_host->host_lock);
628 if (target->state == SRP_TARGET_CONNECTING) {
629 target->state = SRP_TARGET_DEAD;
630 INIT_WORK(&target->work, srp_remove_work);
631 schedule_work(&target->work);
633 spin_unlock_irq(target->scsi_host->host_lock);
638 static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
639 int sg_cnt, struct srp_request *req,
640 struct srp_direct_buf *buf)
648 struct srp_device *dev = target->srp_host->srp_dev;
649 struct ib_device *ibdev = dev->dev;
650 struct scatterlist *sg;
655 if (srp_target_is_mellanox(target) &&
656 (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
660 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
661 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
663 if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
669 if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
670 ~dev->fmr_page_mask) {
680 page_cnt += len >> dev->fmr_page_shift;
681 if (page_cnt > SRP_FMR_SIZE)
684 dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
689 scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
690 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
692 for (j = 0; j < dma_len; j += dev->fmr_page_size)
693 dma_pages[page_cnt++] =
694 (ib_sg_dma_address(ibdev, sg) &
695 dev->fmr_page_mask) + j;
698 req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
699 dma_pages, page_cnt, io_addr);
700 if (IS_ERR(req->fmr)) {
701 ret = PTR_ERR(req->fmr);
706 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
707 ~dev->fmr_page_mask);
708 buf->key = cpu_to_be32(req->fmr->fmr->rkey);
709 buf->len = cpu_to_be32(len);
719 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
720 struct srp_request *req)
722 struct scatterlist *scat;
723 struct srp_cmd *cmd = req->cmd->buf;
724 int len, nents, count;
725 u8 fmt = SRP_DATA_DESC_DIRECT;
726 struct srp_device *dev;
727 struct ib_device *ibdev;
729 if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
730 return sizeof (struct srp_cmd);
732 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
733 scmnd->sc_data_direction != DMA_TO_DEVICE) {
734 shost_printk(KERN_WARNING, target->scsi_host,
735 PFX "Unhandled data direction %d\n",
736 scmnd->sc_data_direction);
740 nents = scsi_sg_count(scmnd);
741 scat = scsi_sglist(scmnd);
743 dev = target->srp_host->srp_dev;
746 count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
748 fmt = SRP_DATA_DESC_DIRECT;
749 len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
753 * The midlayer only generated a single gather/scatter
754 * entry, or DMA mapping coalesced everything to a
755 * single entry. So a direct descriptor along with
756 * the DMA MR suffices.
758 struct srp_direct_buf *buf = (void *) cmd->add_data;
760 buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
761 buf->key = cpu_to_be32(dev->mr->rkey);
762 buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
763 } else if (srp_map_fmr(target, scat, count, req,
764 (void *) cmd->add_data)) {
766 * FMR mapping failed, and the scatterlist has more
767 * than one entry. Generate an indirect memory
770 struct srp_indirect_buf *buf = (void *) cmd->add_data;
771 struct scatterlist *sg;
775 fmt = SRP_DATA_DESC_INDIRECT;
776 len = sizeof (struct srp_cmd) +
777 sizeof (struct srp_indirect_buf) +
778 count * sizeof (struct srp_direct_buf);
780 scsi_for_each_sg(scmnd, sg, count, i) {
781 unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
783 buf->desc_list[i].va =
784 cpu_to_be64(ib_sg_dma_address(ibdev, sg));
785 buf->desc_list[i].key =
786 cpu_to_be32(dev->mr->rkey);
787 buf->desc_list[i].len = cpu_to_be32(dma_len);
791 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
792 cmd->data_out_desc_cnt = count;
794 cmd->data_in_desc_cnt = count;
797 cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
798 buf->table_desc.key =
799 cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
800 buf->table_desc.len =
801 cpu_to_be32(count * sizeof (struct srp_direct_buf));
803 buf->len = cpu_to_be32(datalen);
806 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
807 cmd->buf_fmt = fmt << 4;
815 * Must be called with target->scsi_host->host_lock held to protect
816 * req_lim and tx_head. Lock cannot be dropped between call here and
817 * call to __srp_post_send().
820 * An upper limit for the number of allocated information units for each
822 * - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
823 * more than Scsi_Host.can_queue requests.
824 * - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
825 * - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
826 * one unanswered SRP request to an initiator.
828 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
829 enum srp_iu_type iu_type)
831 s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
834 srp_send_completion(target->send_cq, target);
836 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
839 /* Initiator responses to target requests do not consume credits */
840 if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
841 ++target->zero_req_lim;
845 iu = target->tx_ring[target->tx_head & SRP_SQ_MASK];
851 * Must be called with target->scsi_host->host_lock held to protect
852 * req_lim and tx_head.
854 static int __srp_post_send(struct srp_target_port *target,
855 struct srp_iu *iu, int len)
858 struct ib_send_wr wr, *bad_wr;
863 list.lkey = target->srp_host->srp_dev->mr->lkey;
866 wr.wr_id = target->tx_head & SRP_SQ_MASK;
869 wr.opcode = IB_WR_SEND;
870 wr.send_flags = IB_SEND_SIGNALED;
872 ret = ib_post_send(target->qp, &wr, &bad_wr);
876 if (iu->type != SRP_IU_RSP)
883 static int srp_post_recv(struct srp_target_port *target)
888 struct ib_recv_wr wr, *bad_wr;
892 spin_lock_irqsave(target->scsi_host->host_lock, flags);
894 next = target->rx_head & SRP_RQ_MASK;
896 iu = target->rx_ring[next];
899 list.length = iu->size;
900 list.lkey = target->srp_host->srp_dev->mr->lkey;
906 ret = ib_post_recv(target->qp, &wr, &bad_wr);
910 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
915 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
917 struct srp_request *req;
918 struct scsi_cmnd *scmnd;
922 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
924 spin_lock_irqsave(target->scsi_host->host_lock, flags);
926 target->req_lim += delta;
928 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
930 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
931 if (be32_to_cpu(rsp->resp_data_len) < 4)
932 req->tsk_status = -1;
934 req->tsk_status = rsp->data[3];
935 complete(&req->done);
939 shost_printk(KERN_ERR, target->scsi_host,
940 "Null scmnd for RSP w/tag %016llx\n",
941 (unsigned long long) rsp->tag);
942 scmnd->result = rsp->status;
944 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
945 memcpy(scmnd->sense_buffer, rsp->data +
946 be32_to_cpu(rsp->resp_data_len),
947 min_t(int, be32_to_cpu(rsp->sense_data_len),
948 SCSI_SENSE_BUFFERSIZE));
951 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
952 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
953 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
954 scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
956 if (!req->tsk_mgmt) {
957 scmnd->host_scribble = (void *) -1L;
958 scmnd->scsi_done(scmnd);
960 srp_remove_req(target, req);
965 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
968 static int srp_response_common(struct srp_target_port *target, s32 req_delta,
971 struct ib_device *dev;
976 dev = target->srp_host->srp_dev->dev;
978 spin_lock_irqsave(target->scsi_host->host_lock, flags);
979 target->req_lim += req_delta;
981 iu = __srp_get_tx_iu(target, SRP_IU_RSP);
983 shost_printk(KERN_ERR, target->scsi_host, PFX
984 "no IU available to send response\n");
988 ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
989 memcpy(iu->buf, rsp, len);
990 ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
992 err = __srp_post_send(target, iu, len);
994 shost_printk(KERN_ERR, target->scsi_host, PFX
995 "unable to post response: %d\n", err);
998 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1002 static void srp_process_cred_req(struct srp_target_port *target,
1003 struct srp_cred_req *req)
1005 struct srp_cred_rsp rsp = {
1006 .opcode = SRP_CRED_RSP,
1009 s32 delta = be32_to_cpu(req->req_lim_delta);
1011 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1012 shost_printk(KERN_ERR, target->scsi_host, PFX
1013 "problems processing SRP_CRED_REQ\n");
1016 static void srp_process_aer_req(struct srp_target_port *target,
1017 struct srp_aer_req *req)
1019 struct srp_aer_rsp rsp = {
1020 .opcode = SRP_AER_RSP,
1023 s32 delta = be32_to_cpu(req->req_lim_delta);
1025 shost_printk(KERN_ERR, target->scsi_host, PFX
1026 "ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
1028 if (srp_response_common(target, delta, &rsp, sizeof rsp))
1029 shost_printk(KERN_ERR, target->scsi_host, PFX
1030 "problems processing SRP_AER_REQ\n");
1033 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
1035 struct ib_device *dev;
1040 iu = target->rx_ring[wc->wr_id];
1042 dev = target->srp_host->srp_dev->dev;
1043 ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
1046 opcode = *(u8 *) iu->buf;
1049 shost_printk(KERN_ERR, target->scsi_host,
1050 PFX "recv completion, opcode 0x%02x\n", opcode);
1051 print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
1052 iu->buf, wc->byte_len, true);
1057 srp_process_rsp(target, iu->buf);
1061 srp_process_cred_req(target, iu->buf);
1065 srp_process_aer_req(target, iu->buf);
1069 /* XXX Handle target logout */
1070 shost_printk(KERN_WARNING, target->scsi_host,
1071 PFX "Got target logout request\n");
1075 shost_printk(KERN_WARNING, target->scsi_host,
1076 PFX "Unhandled SRP opcode 0x%02x\n", opcode);
1080 ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
1083 res = srp_post_recv(target);
1085 shost_printk(KERN_ERR, target->scsi_host,
1086 PFX "Recv failed with error code %d\n", res);
1089 static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
1091 struct srp_target_port *target = target_ptr;
1094 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1095 while (ib_poll_cq(cq, 1, &wc) > 0) {
1097 shost_printk(KERN_ERR, target->scsi_host,
1098 PFX "failed receive status %d\n",
1100 target->qp_in_error = 1;
1104 srp_handle_recv(target, &wc);
1108 static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
1110 struct srp_target_port *target = target_ptr;
1113 while (ib_poll_cq(cq, 1, &wc) > 0) {
1115 shost_printk(KERN_ERR, target->scsi_host,
1116 PFX "failed send status %d\n",
1118 target->qp_in_error = 1;
1126 static int srp_queuecommand(struct scsi_cmnd *scmnd,
1127 void (*done)(struct scsi_cmnd *))
1129 struct srp_target_port *target = host_to_target(scmnd->device->host);
1130 struct srp_request *req;
1132 struct srp_cmd *cmd;
1133 struct ib_device *dev;
1136 if (target->state == SRP_TARGET_CONNECTING)
1139 if (target->state == SRP_TARGET_DEAD ||
1140 target->state == SRP_TARGET_REMOVED) {
1141 scmnd->result = DID_BAD_TARGET << 16;
1146 iu = __srp_get_tx_iu(target, SRP_IU_CMD);
1150 dev = target->srp_host->srp_dev->dev;
1151 ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
1154 req = list_first_entry(&target->free_reqs, struct srp_request, list);
1156 scmnd->scsi_done = done;
1158 scmnd->host_scribble = (void *) (long) req->index;
1161 memset(cmd, 0, sizeof *cmd);
1163 cmd->opcode = SRP_CMD;
1164 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
1165 cmd->tag = req->index;
1166 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
1171 req->tsk_mgmt = NULL;
1173 len = srp_map_data(scmnd, target, req);
1175 shost_printk(KERN_ERR, target->scsi_host,
1176 PFX "Failed to map data\n");
1180 ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
1183 if (__srp_post_send(target, iu, len)) {
1184 shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1188 list_move_tail(&req->list, &target->req_queue);
1193 srp_unmap_data(scmnd, target, req);
1196 return SCSI_MLQUEUE_HOST_BUSY;
1199 static int srp_alloc_iu_bufs(struct srp_target_port *target)
1203 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1204 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
1205 target->max_ti_iu_len,
1206 GFP_KERNEL, DMA_FROM_DEVICE);
1207 if (!target->rx_ring[i])
1211 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1212 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1214 GFP_KERNEL, DMA_TO_DEVICE);
1215 if (!target->tx_ring[i])
1222 for (i = 0; i < SRP_RQ_SIZE; ++i) {
1223 srp_free_iu(target->srp_host, target->rx_ring[i]);
1224 target->rx_ring[i] = NULL;
1227 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1228 srp_free_iu(target->srp_host, target->tx_ring[i]);
1229 target->tx_ring[i] = NULL;
1235 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
1236 struct ib_cm_event *event,
1237 struct srp_target_port *target)
1239 struct Scsi_Host *shost = target->scsi_host;
1240 struct ib_class_port_info *cpi;
1243 switch (event->param.rej_rcvd.reason) {
1244 case IB_CM_REJ_PORT_CM_REDIRECT:
1245 cpi = event->param.rej_rcvd.ari;
1246 target->path.dlid = cpi->redirect_lid;
1247 target->path.pkey = cpi->redirect_pkey;
1248 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
1249 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
1251 target->status = target->path.dlid ?
1252 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
1255 case IB_CM_REJ_PORT_REDIRECT:
1256 if (srp_target_is_topspin(target)) {
1258 * Topspin/Cisco SRP gateways incorrectly send
1259 * reject reason code 25 when they mean 24
1262 memcpy(target->path.dgid.raw,
1263 event->param.rej_rcvd.ari, 16);
1265 shost_printk(KERN_DEBUG, shost,
1266 PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
1267 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
1268 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1270 target->status = SRP_PORT_REDIRECT;
1272 shost_printk(KERN_WARNING, shost,
1273 " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1274 target->status = -ECONNRESET;
1278 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1279 shost_printk(KERN_WARNING, shost,
1280 " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1281 target->status = -ECONNRESET;
1284 case IB_CM_REJ_CONSUMER_DEFINED:
1285 opcode = *(u8 *) event->private_data;
1286 if (opcode == SRP_LOGIN_REJ) {
1287 struct srp_login_rej *rej = event->private_data;
1288 u32 reason = be32_to_cpu(rej->reason);
1290 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1291 shost_printk(KERN_WARNING, shost,
1292 PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1294 shost_printk(KERN_WARNING, shost,
1295 PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1297 shost_printk(KERN_WARNING, shost,
1298 " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1299 " opcode 0x%02x\n", opcode);
1300 target->status = -ECONNRESET;
1303 case IB_CM_REJ_STALE_CONN:
1304 shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
1305 target->status = SRP_STALE_CONN;
1309 shost_printk(KERN_WARNING, shost, " REJ reason 0x%x\n",
1310 event->param.rej_rcvd.reason);
1311 target->status = -ECONNRESET;
1315 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1317 struct srp_target_port *target = cm_id->context;
1318 struct ib_qp_attr *qp_attr = NULL;
1324 switch (event->event) {
1325 case IB_CM_REQ_ERROR:
1326 shost_printk(KERN_DEBUG, target->scsi_host,
1327 PFX "Sending CM REQ failed\n");
1329 target->status = -ECONNRESET;
1332 case IB_CM_REP_RECEIVED:
1334 opcode = *(u8 *) event->private_data;
1336 if (opcode == SRP_LOGIN_RSP) {
1337 struct srp_login_rsp *rsp = event->private_data;
1339 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1340 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1343 * Reserve credits for task management so we don't
1344 * bounce requests back to the SCSI mid-layer.
1346 target->scsi_host->can_queue
1347 = min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
1348 target->scsi_host->can_queue);
1350 shost_printk(KERN_WARNING, target->scsi_host,
1351 PFX "Unhandled RSP opcode %#x\n", opcode);
1352 target->status = -ECONNRESET;
1356 if (!target->rx_ring[0]) {
1357 target->status = srp_alloc_iu_bufs(target);
1362 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1364 target->status = -ENOMEM;
1368 qp_attr->qp_state = IB_QPS_RTR;
1369 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1373 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1377 for (i = 0; i < SRP_RQ_SIZE; i++) {
1378 target->status = srp_post_recv(target);
1385 qp_attr->qp_state = IB_QPS_RTS;
1386 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1390 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1394 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1400 case IB_CM_REJ_RECEIVED:
1401 shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1404 srp_cm_rej_handler(cm_id, event, target);
1407 case IB_CM_DREQ_RECEIVED:
1408 shost_printk(KERN_WARNING, target->scsi_host,
1409 PFX "DREQ received - connection closed\n");
1410 if (ib_send_cm_drep(cm_id, NULL, 0))
1411 shost_printk(KERN_ERR, target->scsi_host,
1412 PFX "Sending CM DREP failed\n");
1415 case IB_CM_TIMEWAIT_EXIT:
1416 shost_printk(KERN_ERR, target->scsi_host,
1417 PFX "connection closed\n");
1423 case IB_CM_MRA_RECEIVED:
1424 case IB_CM_DREQ_ERROR:
1425 case IB_CM_DREP_RECEIVED:
1429 shost_printk(KERN_WARNING, target->scsi_host,
1430 PFX "Unhandled CM event %d\n", event->event);
1435 complete(&target->done);
1442 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1443 struct srp_request *req, u8 func)
1445 struct ib_device *dev = target->srp_host->srp_dev->dev;
1447 struct srp_tsk_mgmt *tsk_mgmt;
1449 spin_lock_irq(target->scsi_host->host_lock);
1451 if (target->state == SRP_TARGET_DEAD ||
1452 target->state == SRP_TARGET_REMOVED) {
1453 req->scmnd->result = DID_BAD_TARGET << 16;
1457 init_completion(&req->done);
1459 iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
1463 ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
1466 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1468 tsk_mgmt->opcode = SRP_TSK_MGMT;
1469 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1470 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1471 tsk_mgmt->tsk_mgmt_func = func;
1472 tsk_mgmt->task_tag = req->index;
1474 ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
1476 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1481 spin_unlock_irq(target->scsi_host->host_lock);
1483 if (!wait_for_completion_timeout(&req->done,
1484 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1490 spin_unlock_irq(target->scsi_host->host_lock);
1494 static int srp_find_req(struct srp_target_port *target,
1495 struct scsi_cmnd *scmnd,
1496 struct srp_request **req)
1498 if (scmnd->host_scribble == (void *) -1L)
1501 *req = &target->req_ring[(long) scmnd->host_scribble];
1506 static int srp_abort(struct scsi_cmnd *scmnd)
1508 struct srp_target_port *target = host_to_target(scmnd->device->host);
1509 struct srp_request *req;
1512 shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1514 if (target->qp_in_error)
1516 if (srp_find_req(target, scmnd, &req))
1518 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1521 spin_lock_irq(target->scsi_host->host_lock);
1523 if (req->cmd_done) {
1524 srp_remove_req(target, req);
1525 scmnd->scsi_done(scmnd);
1526 } else if (!req->tsk_status) {
1527 srp_remove_req(target, req);
1528 scmnd->result = DID_ABORT << 16;
1532 spin_unlock_irq(target->scsi_host->host_lock);
1537 static int srp_reset_device(struct scsi_cmnd *scmnd)
1539 struct srp_target_port *target = host_to_target(scmnd->device->host);
1540 struct srp_request *req, *tmp;
1542 shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1544 if (target->qp_in_error)
1546 if (srp_find_req(target, scmnd, &req))
1548 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1550 if (req->tsk_status)
1553 spin_lock_irq(target->scsi_host->host_lock);
1555 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1556 if (req->scmnd->device == scmnd->device)
1557 srp_reset_req(target, req);
1559 spin_unlock_irq(target->scsi_host->host_lock);
1564 static int srp_reset_host(struct scsi_cmnd *scmnd)
1566 struct srp_target_port *target = host_to_target(scmnd->device->host);
1569 shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1571 if (!srp_reconnect_target(target))
1577 static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
1580 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1582 if (target->state == SRP_TARGET_DEAD ||
1583 target->state == SRP_TARGET_REMOVED)
1586 return sprintf(buf, "0x%016llx\n",
1587 (unsigned long long) be64_to_cpu(target->id_ext));
1590 static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
1593 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1595 if (target->state == SRP_TARGET_DEAD ||
1596 target->state == SRP_TARGET_REMOVED)
1599 return sprintf(buf, "0x%016llx\n",
1600 (unsigned long long) be64_to_cpu(target->ioc_guid));
1603 static ssize_t show_service_id(struct device *dev,
1604 struct device_attribute *attr, char *buf)
1606 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1608 if (target->state == SRP_TARGET_DEAD ||
1609 target->state == SRP_TARGET_REMOVED)
1612 return sprintf(buf, "0x%016llx\n",
1613 (unsigned long long) be64_to_cpu(target->service_id));
1616 static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
1619 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1621 if (target->state == SRP_TARGET_DEAD ||
1622 target->state == SRP_TARGET_REMOVED)
1625 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1628 static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
1631 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1633 if (target->state == SRP_TARGET_DEAD ||
1634 target->state == SRP_TARGET_REMOVED)
1637 return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1640 static ssize_t show_orig_dgid(struct device *dev,
1641 struct device_attribute *attr, char *buf)
1643 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1645 if (target->state == SRP_TARGET_DEAD ||
1646 target->state == SRP_TARGET_REMOVED)
1649 return sprintf(buf, "%pI6\n", target->orig_dgid);
1652 static ssize_t show_req_lim(struct device *dev,
1653 struct device_attribute *attr, char *buf)
1655 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1657 if (target->state == SRP_TARGET_DEAD ||
1658 target->state == SRP_TARGET_REMOVED)
1661 return sprintf(buf, "%d\n", target->req_lim);
1664 static ssize_t show_zero_req_lim(struct device *dev,
1665 struct device_attribute *attr, char *buf)
1667 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1669 if (target->state == SRP_TARGET_DEAD ||
1670 target->state == SRP_TARGET_REMOVED)
1673 return sprintf(buf, "%d\n", target->zero_req_lim);
1676 static ssize_t show_local_ib_port(struct device *dev,
1677 struct device_attribute *attr, char *buf)
1679 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1681 return sprintf(buf, "%d\n", target->srp_host->port);
1684 static ssize_t show_local_ib_device(struct device *dev,
1685 struct device_attribute *attr, char *buf)
1687 struct srp_target_port *target = host_to_target(class_to_shost(dev));
1689 return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1692 static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1693 static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1694 static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1695 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1696 static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1697 static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
1698 static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
1699 static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
1700 static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
1701 static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
1703 static struct device_attribute *srp_host_attrs[] = {
1706 &dev_attr_service_id,
1709 &dev_attr_orig_dgid,
1711 &dev_attr_zero_req_lim,
1712 &dev_attr_local_ib_port,
1713 &dev_attr_local_ib_device,
1717 static struct scsi_host_template srp_template = {
1718 .module = THIS_MODULE,
1719 .name = "InfiniBand SRP initiator",
1720 .proc_name = DRV_NAME,
1721 .info = srp_target_info,
1722 .queuecommand = srp_queuecommand,
1723 .eh_abort_handler = srp_abort,
1724 .eh_device_reset_handler = srp_reset_device,
1725 .eh_host_reset_handler = srp_reset_host,
1726 .can_queue = SRP_CMD_SQ_SIZE,
1728 .cmd_per_lun = SRP_CMD_SQ_SIZE,
1729 .use_clustering = ENABLE_CLUSTERING,
1730 .shost_attrs = srp_host_attrs
1733 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1735 struct srp_rport_identifiers ids;
1736 struct srp_rport *rport;
1738 sprintf(target->target_name, "SRP.T10:%016llX",
1739 (unsigned long long) be64_to_cpu(target->id_ext));
1741 if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1744 memcpy(ids.port_id, &target->id_ext, 8);
1745 memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1746 ids.roles = SRP_RPORT_ROLE_TARGET;
1747 rport = srp_rport_add(target->scsi_host, &ids);
1748 if (IS_ERR(rport)) {
1749 scsi_remove_host(target->scsi_host);
1750 return PTR_ERR(rport);
1753 spin_lock(&host->target_lock);
1754 list_add_tail(&target->list, &host->target_list);
1755 spin_unlock(&host->target_lock);
1757 target->state = SRP_TARGET_LIVE;
1759 scsi_scan_target(&target->scsi_host->shost_gendev,
1760 0, target->scsi_id, SCAN_WILD_CARD, 0);
1765 static void srp_release_dev(struct device *dev)
1767 struct srp_host *host =
1768 container_of(dev, struct srp_host, dev);
1770 complete(&host->released);
1773 static struct class srp_class = {
1774 .name = "infiniband_srp",
1775 .dev_release = srp_release_dev
1779 * Target ports are added by writing
1781 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1782 * pkey=<P_Key>,service_id=<service ID>
1784 * to the add_target sysfs attribute.
1788 SRP_OPT_ID_EXT = 1 << 0,
1789 SRP_OPT_IOC_GUID = 1 << 1,
1790 SRP_OPT_DGID = 1 << 2,
1791 SRP_OPT_PKEY = 1 << 3,
1792 SRP_OPT_SERVICE_ID = 1 << 4,
1793 SRP_OPT_MAX_SECT = 1 << 5,
1794 SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
1795 SRP_OPT_IO_CLASS = 1 << 7,
1796 SRP_OPT_INITIATOR_EXT = 1 << 8,
1797 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1801 SRP_OPT_SERVICE_ID),
1804 static const match_table_t srp_opt_tokens = {
1805 { SRP_OPT_ID_EXT, "id_ext=%s" },
1806 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1807 { SRP_OPT_DGID, "dgid=%s" },
1808 { SRP_OPT_PKEY, "pkey=%x" },
1809 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1810 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1811 { SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
1812 { SRP_OPT_IO_CLASS, "io_class=%x" },
1813 { SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
1814 { SRP_OPT_ERR, NULL }
1817 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1819 char *options, *sep_opt;
1822 substring_t args[MAX_OPT_ARGS];
1828 options = kstrdup(buf, GFP_KERNEL);
1833 while ((p = strsep(&sep_opt, ",")) != NULL) {
1837 token = match_token(p, srp_opt_tokens, args);
1841 case SRP_OPT_ID_EXT:
1842 p = match_strdup(args);
1847 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1851 case SRP_OPT_IOC_GUID:
1852 p = match_strdup(args);
1857 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1862 p = match_strdup(args);
1867 if (strlen(p) != 32) {
1868 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1873 for (i = 0; i < 16; ++i) {
1874 strlcpy(dgid, p + i * 2, 3);
1875 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1878 memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1882 if (match_hex(args, &token)) {
1883 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1886 target->path.pkey = cpu_to_be16(token);
1889 case SRP_OPT_SERVICE_ID:
1890 p = match_strdup(args);
1895 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1896 target->path.service_id = target->service_id;
1900 case SRP_OPT_MAX_SECT:
1901 if (match_int(args, &token)) {
1902 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1905 target->scsi_host->max_sectors = token;
1908 case SRP_OPT_MAX_CMD_PER_LUN:
1909 if (match_int(args, &token)) {
1910 printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
1913 target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
1916 case SRP_OPT_IO_CLASS:
1917 if (match_hex(args, &token)) {
1918 printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
1921 if (token != SRP_REV10_IB_IO_CLASS &&
1922 token != SRP_REV16A_IB_IO_CLASS) {
1923 printk(KERN_WARNING PFX "unknown IO class parameter value"
1924 " %x specified (use %x or %x).\n",
1925 token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
1928 target->io_class = token;
1931 case SRP_OPT_INITIATOR_EXT:
1932 p = match_strdup(args);
1937 target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1942 printk(KERN_WARNING PFX "unknown parameter or missing value "
1943 "'%s' in target creation request\n", p);
1948 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1951 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1952 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1953 !(srp_opt_tokens[i].token & opt_mask))
1954 printk(KERN_WARNING PFX "target creation request is "
1955 "missing parameter '%s'\n",
1956 srp_opt_tokens[i].pattern);
1963 static ssize_t srp_create_target(struct device *dev,
1964 struct device_attribute *attr,
1965 const char *buf, size_t count)
1967 struct srp_host *host =
1968 container_of(dev, struct srp_host, dev);
1969 struct Scsi_Host *target_host;
1970 struct srp_target_port *target;
1974 target_host = scsi_host_alloc(&srp_template,
1975 sizeof (struct srp_target_port));
1979 target_host->transportt = ib_srp_transport_template;
1980 target_host->max_lun = SRP_MAX_LUN;
1981 target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
1983 target = host_to_target(target_host);
1985 target->io_class = SRP_REV16A_IB_IO_CLASS;
1986 target->scsi_host = target_host;
1987 target->srp_host = host;
1989 INIT_LIST_HEAD(&target->free_reqs);
1990 INIT_LIST_HEAD(&target->req_queue);
1991 for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
1992 target->req_ring[i].index = i;
1993 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1996 ret = srp_parse_options(buf, target);
2000 ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
2002 shost_printk(KERN_DEBUG, target->scsi_host, PFX
2003 "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
2004 "service_id %016llx dgid %pI6\n",
2005 (unsigned long long) be64_to_cpu(target->id_ext),
2006 (unsigned long long) be64_to_cpu(target->ioc_guid),
2007 be16_to_cpu(target->path.pkey),
2008 (unsigned long long) be64_to_cpu(target->service_id),
2009 target->path.dgid.raw);
2011 ret = srp_create_target_ib(target);
2015 ret = srp_new_cm_id(target);
2019 target->qp_in_error = 0;
2020 ret = srp_connect_target(target);
2022 shost_printk(KERN_ERR, target->scsi_host,
2023 PFX "Connection failed\n");
2027 ret = srp_add_target(host, target);
2029 goto err_disconnect;
2034 srp_disconnect_target(target);
2037 ib_destroy_cm_id(target->cm_id);
2040 srp_free_target_ib(target);
2043 scsi_host_put(target_host);
2048 static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
2050 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
2053 struct srp_host *host = container_of(dev, struct srp_host, dev);
2055 return sprintf(buf, "%s\n", host->srp_dev->dev->name);
2058 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
2060 static ssize_t show_port(struct device *dev, struct device_attribute *attr,
2063 struct srp_host *host = container_of(dev, struct srp_host, dev);
2065 return sprintf(buf, "%d\n", host->port);
2068 static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
2070 static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
2072 struct srp_host *host;
2074 host = kzalloc(sizeof *host, GFP_KERNEL);
2078 INIT_LIST_HEAD(&host->target_list);
2079 spin_lock_init(&host->target_lock);
2080 init_completion(&host->released);
2081 host->srp_dev = device;
2084 host->dev.class = &srp_class;
2085 host->dev.parent = device->dev->dma_device;
2086 dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
2088 if (device_register(&host->dev))
2090 if (device_create_file(&host->dev, &dev_attr_add_target))
2092 if (device_create_file(&host->dev, &dev_attr_ibdev))
2094 if (device_create_file(&host->dev, &dev_attr_port))
2100 device_unregister(&host->dev);
2108 static void srp_add_one(struct ib_device *device)
2110 struct srp_device *srp_dev;
2111 struct ib_device_attr *dev_attr;
2112 struct ib_fmr_pool_param fmr_param;
2113 struct srp_host *host;
2116 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
2120 if (ib_query_device(device, dev_attr)) {
2121 printk(KERN_WARNING PFX "Query device failed for %s\n",
2126 srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
2131 * Use the smallest page size supported by the HCA, down to a
2132 * minimum of 512 bytes (which is the smallest sector that a
2133 * SCSI command will ever carry).
2135 srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
2136 srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
2137 srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
2139 INIT_LIST_HEAD(&srp_dev->dev_list);
2141 srp_dev->dev = device;
2142 srp_dev->pd = ib_alloc_pd(device);
2143 if (IS_ERR(srp_dev->pd))
2146 srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
2147 IB_ACCESS_LOCAL_WRITE |
2148 IB_ACCESS_REMOTE_READ |
2149 IB_ACCESS_REMOTE_WRITE);
2150 if (IS_ERR(srp_dev->mr))
2153 memset(&fmr_param, 0, sizeof fmr_param);
2154 fmr_param.pool_size = SRP_FMR_POOL_SIZE;
2155 fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
2156 fmr_param.cache = 1;
2157 fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
2158 fmr_param.page_shift = srp_dev->fmr_page_shift;
2159 fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
2160 IB_ACCESS_REMOTE_WRITE |
2161 IB_ACCESS_REMOTE_READ);
2163 srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
2164 if (IS_ERR(srp_dev->fmr_pool))
2165 srp_dev->fmr_pool = NULL;
2167 if (device->node_type == RDMA_NODE_IB_SWITCH) {
2172 e = device->phys_port_cnt;
2175 for (p = s; p <= e; ++p) {
2176 host = srp_add_port(srp_dev, p);
2178 list_add_tail(&host->list, &srp_dev->dev_list);
2181 ib_set_client_data(device, &srp_client, srp_dev);
2186 ib_dealloc_pd(srp_dev->pd);
2195 static void srp_remove_one(struct ib_device *device)
2197 struct srp_device *srp_dev;
2198 struct srp_host *host, *tmp_host;
2199 LIST_HEAD(target_list);
2200 struct srp_target_port *target, *tmp_target;
2202 srp_dev = ib_get_client_data(device, &srp_client);
2204 list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2205 device_unregister(&host->dev);
2207 * Wait for the sysfs entry to go away, so that no new
2208 * target ports can be created.
2210 wait_for_completion(&host->released);
2213 * Mark all target ports as removed, so we stop queueing
2214 * commands and don't try to reconnect.
2216 spin_lock(&host->target_lock);
2217 list_for_each_entry(target, &host->target_list, list) {
2218 spin_lock_irq(target->scsi_host->host_lock);
2219 target->state = SRP_TARGET_REMOVED;
2220 spin_unlock_irq(target->scsi_host->host_lock);
2222 spin_unlock(&host->target_lock);
2225 * Wait for any reconnection tasks that may have
2226 * started before we marked our target ports as
2227 * removed, and any target port removal tasks.
2229 flush_scheduled_work();
2231 list_for_each_entry_safe(target, tmp_target,
2232 &host->target_list, list) {
2233 srp_remove_host(target->scsi_host);
2234 scsi_remove_host(target->scsi_host);
2235 srp_disconnect_target(target);
2236 ib_destroy_cm_id(target->cm_id);
2237 srp_free_target_ib(target);
2238 scsi_host_put(target->scsi_host);
2244 if (srp_dev->fmr_pool)
2245 ib_destroy_fmr_pool(srp_dev->fmr_pool);
2246 ib_dereg_mr(srp_dev->mr);
2247 ib_dealloc_pd(srp_dev->pd);
2252 static struct srp_function_template ib_srp_transport_functions = {
2255 static int __init srp_init_module(void)
2259 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_SQ_SIZE);
2260 BUILD_BUG_ON_NOT_POWER_OF_2(SRP_RQ_SIZE);
2262 if (srp_sg_tablesize > 255) {
2263 printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
2264 srp_sg_tablesize = 255;
2267 ib_srp_transport_template =
2268 srp_attach_transport(&ib_srp_transport_functions);
2269 if (!ib_srp_transport_template)
2272 srp_template.sg_tablesize = srp_sg_tablesize;
2273 srp_max_iu_len = (sizeof (struct srp_cmd) +
2274 sizeof (struct srp_indirect_buf) +
2275 srp_sg_tablesize * 16);
2277 ret = class_register(&srp_class);
2279 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2280 srp_release_transport(ib_srp_transport_template);
2284 ib_sa_register_client(&srp_sa_client);
2286 ret = ib_register_client(&srp_client);
2288 printk(KERN_ERR PFX "couldn't register IB client\n");
2289 srp_release_transport(ib_srp_transport_template);
2290 ib_sa_unregister_client(&srp_sa_client);
2291 class_unregister(&srp_class);
2298 static void __exit srp_cleanup_module(void)
2300 ib_unregister_client(&srp_client);
2301 ib_sa_unregister_client(&srp_sa_client);
2302 class_unregister(&srp_class);
2303 srp_release_transport(ib_srp_transport_template);
2306 module_init(srp_init_module);
2307 module_exit(srp_cleanup_module);