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
32 * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
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>
44 #include <asm/atomic.h>
46 #include <scsi/scsi.h>
47 #include <scsi/scsi_device.h>
48 #include <scsi/scsi_dbg.h>
51 #include <rdma/ib_cache.h>
55 #define DRV_NAME "ib_srp"
56 #define PFX DRV_NAME ": "
57 #define DRV_VERSION "0.2"
58 #define DRV_RELDATE "November 1, 2005"
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
62 "v" DRV_VERSION " (" DRV_RELDATE ")");
63 MODULE_LICENSE("Dual BSD/GPL");
65 static int topspin_workarounds = 1;
67 module_param(topspin_workarounds, int, 0444);
68 MODULE_PARM_DESC(topspin_workarounds,
69 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
71 static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
73 static void srp_add_one(struct ib_device *device);
74 static void srp_remove_one(struct ib_device *device);
75 static void srp_completion(struct ib_cq *cq, void *target_ptr);
76 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
78 static struct ib_client srp_client = {
81 .remove = srp_remove_one
84 static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
86 return (struct srp_target_port *) host->hostdata;
89 static const char *srp_target_info(struct Scsi_Host *host)
91 return host_to_target(host)->target_name;
94 static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
96 enum dma_data_direction direction)
100 iu = kmalloc(sizeof *iu, gfp_mask);
104 iu->buf = kzalloc(size, gfp_mask);
108 iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
109 if (dma_mapping_error(iu->dma))
113 iu->direction = direction;
125 static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
130 dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
135 static void srp_qp_event(struct ib_event *event, void *context)
137 printk(KERN_ERR PFX "QP event %d\n", event->event);
140 static int srp_init_qp(struct srp_target_port *target,
143 struct ib_qp_attr *attr;
146 attr = kmalloc(sizeof *attr, GFP_KERNEL);
150 ret = ib_find_cached_pkey(target->srp_host->dev,
151 target->srp_host->port,
152 be16_to_cpu(target->path.pkey),
157 attr->qp_state = IB_QPS_INIT;
158 attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
159 IB_ACCESS_REMOTE_WRITE);
160 attr->port_num = target->srp_host->port;
162 ret = ib_modify_qp(qp, attr,
173 static int srp_create_target_ib(struct srp_target_port *target)
175 struct ib_qp_init_attr *init_attr;
178 init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
182 target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
183 NULL, target, SRP_CQ_SIZE);
184 if (IS_ERR(target->cq)) {
185 ret = PTR_ERR(target->cq);
189 ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
191 init_attr->event_handler = srp_qp_event;
192 init_attr->cap.max_send_wr = SRP_SQ_SIZE;
193 init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
194 init_attr->cap.max_recv_sge = 1;
195 init_attr->cap.max_send_sge = 1;
196 init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
197 init_attr->qp_type = IB_QPT_RC;
198 init_attr->send_cq = target->cq;
199 init_attr->recv_cq = target->cq;
201 target->qp = ib_create_qp(target->srp_host->pd, init_attr);
202 if (IS_ERR(target->qp)) {
203 ret = PTR_ERR(target->qp);
204 ib_destroy_cq(target->cq);
208 ret = srp_init_qp(target, target->qp);
210 ib_destroy_qp(target->qp);
211 ib_destroy_cq(target->cq);
220 static void srp_free_target_ib(struct srp_target_port *target)
224 ib_destroy_qp(target->qp);
225 ib_destroy_cq(target->cq);
227 for (i = 0; i < SRP_RQ_SIZE; ++i)
228 srp_free_iu(target->srp_host, target->rx_ring[i]);
229 for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
230 srp_free_iu(target->srp_host, target->tx_ring[i]);
233 static void srp_path_rec_completion(int status,
234 struct ib_sa_path_rec *pathrec,
237 struct srp_target_port *target = target_ptr;
239 target->status = status;
241 printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
243 target->path = *pathrec;
244 complete(&target->done);
247 static int srp_lookup_path(struct srp_target_port *target)
249 target->path.numb_path = 1;
251 init_completion(&target->done);
253 target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
254 target->srp_host->port,
256 IB_SA_PATH_REC_DGID |
257 IB_SA_PATH_REC_SGID |
258 IB_SA_PATH_REC_NUMB_PATH |
260 SRP_PATH_REC_TIMEOUT_MS,
262 srp_path_rec_completion,
263 target, &target->path_query);
264 if (target->path_query_id < 0)
265 return target->path_query_id;
267 wait_for_completion(&target->done);
269 if (target->status < 0)
270 printk(KERN_WARNING PFX "Path record query failed\n");
272 return target->status;
275 static int srp_send_req(struct srp_target_port *target)
278 struct ib_cm_req_param param;
279 struct srp_login_req priv;
283 req = kzalloc(sizeof *req, GFP_KERNEL);
287 req->param.primary_path = &target->path;
288 req->param.alternate_path = NULL;
289 req->param.service_id = target->service_id;
290 req->param.qp_num = target->qp->qp_num;
291 req->param.qp_type = target->qp->qp_type;
292 req->param.private_data = &req->priv;
293 req->param.private_data_len = sizeof req->priv;
294 req->param.flow_control = 1;
296 get_random_bytes(&req->param.starting_psn, 4);
297 req->param.starting_psn &= 0xffffff;
300 * Pick some arbitrary defaults here; we could make these
301 * module parameters if anyone cared about setting them.
303 req->param.responder_resources = 4;
304 req->param.remote_cm_response_timeout = 20;
305 req->param.local_cm_response_timeout = 20;
306 req->param.retry_count = 7;
307 req->param.rnr_retry_count = 7;
308 req->param.max_cm_retries = 15;
310 req->priv.opcode = SRP_LOGIN_REQ;
312 req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
313 req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
314 SRP_BUF_FORMAT_INDIRECT);
315 memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
317 * Topspin/Cisco SRP targets will reject our login unless we
318 * zero out the first 8 bytes of our initiator port ID. The
319 * second 8 bytes must be our local node GUID, but we always
322 if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
323 printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
324 "activated for target GUID %016llx\n",
325 (unsigned long long) be64_to_cpu(target->ioc_guid));
326 memset(req->priv.initiator_port_id, 0, 8);
328 memcpy(req->priv.target_port_id, &target->id_ext, 8);
329 memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
331 status = ib_send_cm_req(target->cm_id, &req->param);
338 static void srp_disconnect_target(struct srp_target_port *target)
340 /* XXX should send SRP_I_LOGOUT request */
342 init_completion(&target->done);
343 if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
344 printk(KERN_DEBUG PFX "Sending CM DREQ failed\n");
347 wait_for_completion(&target->done);
350 static void srp_remove_work(void *target_ptr)
352 struct srp_target_port *target = target_ptr;
354 spin_lock_irq(target->scsi_host->host_lock);
355 if (target->state != SRP_TARGET_DEAD) {
356 spin_unlock_irq(target->scsi_host->host_lock);
357 scsi_host_put(target->scsi_host);
360 target->state = SRP_TARGET_REMOVED;
361 spin_unlock_irq(target->scsi_host->host_lock);
363 mutex_lock(&target->srp_host->target_mutex);
364 list_del(&target->list);
365 mutex_unlock(&target->srp_host->target_mutex);
367 scsi_remove_host(target->scsi_host);
368 ib_destroy_cm_id(target->cm_id);
369 srp_free_target_ib(target);
370 scsi_host_put(target->scsi_host);
371 /* And another put to really free the target port... */
372 scsi_host_put(target->scsi_host);
375 static int srp_connect_target(struct srp_target_port *target)
379 ret = srp_lookup_path(target);
384 init_completion(&target->done);
385 ret = srp_send_req(target);
388 wait_for_completion(&target->done);
391 * The CM event handling code will set status to
392 * SRP_PORT_REDIRECT if we get a port redirect REJ
393 * back, or SRP_DLID_REDIRECT if we get a lid/qp
396 switch (target->status) {
400 case SRP_PORT_REDIRECT:
401 ret = srp_lookup_path(target);
406 case SRP_DLID_REDIRECT:
410 return target->status;
415 static void srp_unmap_data(struct scsi_cmnd *scmnd,
416 struct srp_target_port *target,
417 struct srp_request *req)
419 struct scatterlist *scat;
422 if (!scmnd->request_buffer ||
423 (scmnd->sc_data_direction != DMA_TO_DEVICE &&
424 scmnd->sc_data_direction != DMA_FROM_DEVICE))
428 * This handling of non-SG commands can be killed when the
429 * SCSI midlayer no longer generates non-SG commands.
431 if (likely(scmnd->use_sg)) {
432 nents = scmnd->use_sg;
433 scat = scmnd->request_buffer;
436 scat = &req->fake_sg;
439 dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
440 scmnd->sc_data_direction);
443 static int srp_reconnect_target(struct srp_target_port *target)
445 struct ib_cm_id *new_cm_id;
446 struct ib_qp_attr qp_attr;
447 struct srp_request *req;
452 spin_lock_irq(target->scsi_host->host_lock);
453 if (target->state != SRP_TARGET_LIVE) {
454 spin_unlock_irq(target->scsi_host->host_lock);
457 target->state = SRP_TARGET_CONNECTING;
458 spin_unlock_irq(target->scsi_host->host_lock);
460 srp_disconnect_target(target);
462 * Now get a new local CM ID so that we avoid confusing the
463 * target in case things are really fouled up.
465 new_cm_id = ib_create_cm_id(target->srp_host->dev,
466 srp_cm_handler, target);
467 if (IS_ERR(new_cm_id)) {
468 ret = PTR_ERR(new_cm_id);
471 ib_destroy_cm_id(target->cm_id);
472 target->cm_id = new_cm_id;
474 qp_attr.qp_state = IB_QPS_RESET;
475 ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
479 ret = srp_init_qp(target, target->qp);
483 while (ib_poll_cq(target->cq, 1, &wc) > 0)
486 list_for_each_entry(req, &target->req_queue, list) {
487 req->scmnd->result = DID_RESET << 16;
488 req->scmnd->scsi_done(req->scmnd);
489 srp_unmap_data(req->scmnd, target, req);
495 INIT_LIST_HEAD(&target->free_reqs);
496 INIT_LIST_HEAD(&target->req_queue);
497 for (i = 0; i < SRP_SQ_SIZE; ++i)
498 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
500 ret = srp_connect_target(target);
504 spin_lock_irq(target->scsi_host->host_lock);
505 if (target->state == SRP_TARGET_CONNECTING) {
507 target->state = SRP_TARGET_LIVE;
510 spin_unlock_irq(target->scsi_host->host_lock);
515 printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
518 * We couldn't reconnect, so kill our target port off.
519 * However, we have to defer the real removal because we might
520 * be in the context of the SCSI error handler now, which
521 * would deadlock if we call scsi_remove_host().
523 spin_lock_irq(target->scsi_host->host_lock);
524 if (target->state == SRP_TARGET_CONNECTING) {
525 target->state = SRP_TARGET_DEAD;
526 INIT_WORK(&target->work, srp_remove_work, target);
527 schedule_work(&target->work);
529 spin_unlock_irq(target->scsi_host->host_lock);
534 static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
535 struct srp_request *req)
537 struct scatterlist *scat;
538 struct srp_cmd *cmd = req->cmd->buf;
539 int len, nents, count;
543 if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
544 return sizeof (struct srp_cmd);
546 if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
547 scmnd->sc_data_direction != DMA_TO_DEVICE) {
548 printk(KERN_WARNING PFX "Unhandled data direction %d\n",
549 scmnd->sc_data_direction);
554 * This handling of non-SG commands can be killed when the
555 * SCSI midlayer no longer generates non-SG commands.
557 if (likely(scmnd->use_sg)) {
558 nents = scmnd->use_sg;
559 scat = scmnd->request_buffer;
562 scat = &req->fake_sg;
563 sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
566 count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
567 scmnd->sc_data_direction);
570 struct srp_direct_buf *buf = (void *) cmd->add_data;
572 fmt = SRP_DATA_DESC_DIRECT;
574 buf->va = cpu_to_be64(sg_dma_address(scat));
575 buf->key = cpu_to_be32(target->srp_host->mr->rkey);
576 buf->len = cpu_to_be32(sg_dma_len(scat));
578 len = sizeof (struct srp_cmd) +
579 sizeof (struct srp_direct_buf);
581 struct srp_indirect_buf *buf = (void *) cmd->add_data;
584 fmt = SRP_DATA_DESC_INDIRECT;
586 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
587 cmd->data_out_desc_cnt = count;
589 cmd->data_in_desc_cnt = count;
591 buf->table_desc.va = cpu_to_be64(req->cmd->dma +
594 buf->table_desc.key =
595 cpu_to_be32(target->srp_host->mr->rkey);
596 buf->table_desc.len =
597 cpu_to_be32(count * sizeof (struct srp_direct_buf));
599 for (i = 0; i < count; ++i) {
600 buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
601 buf->desc_list[i].key =
602 cpu_to_be32(target->srp_host->mr->rkey);
603 buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
605 datalen += sg_dma_len(&scat[i]);
608 buf->len = cpu_to_be32(datalen);
610 len = sizeof (struct srp_cmd) +
611 sizeof (struct srp_indirect_buf) +
612 count * sizeof (struct srp_direct_buf);
615 if (scmnd->sc_data_direction == DMA_TO_DEVICE)
616 cmd->buf_fmt = fmt << 4;
623 static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
625 srp_unmap_data(req->scmnd, target, req);
626 list_move_tail(&req->list, &target->free_reqs);
629 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
631 struct srp_request *req;
632 struct scsi_cmnd *scmnd;
636 delta = (s32) be32_to_cpu(rsp->req_lim_delta);
638 spin_lock_irqsave(target->scsi_host->host_lock, flags);
640 target->req_lim += delta;
642 req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
644 if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
645 if (be32_to_cpu(rsp->resp_data_len) < 4)
646 req->tsk_status = -1;
648 req->tsk_status = rsp->data[3];
649 complete(&req->done);
653 printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
654 (unsigned long long) rsp->tag);
655 scmnd->result = rsp->status;
657 if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
658 memcpy(scmnd->sense_buffer, rsp->data +
659 be32_to_cpu(rsp->resp_data_len),
660 min_t(int, be32_to_cpu(rsp->sense_data_len),
661 SCSI_SENSE_BUFFERSIZE));
664 if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
665 scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
666 else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
667 scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
669 if (!req->tsk_mgmt) {
670 scmnd->host_scribble = (void *) -1L;
671 scmnd->scsi_done(scmnd);
673 srp_remove_req(target, req);
678 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
681 static void srp_reconnect_work(void *target_ptr)
683 struct srp_target_port *target = target_ptr;
685 srp_reconnect_target(target);
688 static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
693 iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
695 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
696 target->max_ti_iu_len, DMA_FROM_DEVICE);
698 opcode = *(u8 *) iu->buf;
703 printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
705 for (i = 0; i < wc->byte_len; ++i) {
707 printk(KERN_ERR " [%02x] ", i);
708 printk(" %02x", ((u8 *) iu->buf)[i]);
709 if ((i + 1) % 8 == 0)
713 if (wc->byte_len % 8)
719 srp_process_rsp(target, iu->buf);
723 /* XXX Handle target logout */
724 printk(KERN_WARNING PFX "Got target logout request\n");
728 printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
732 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
733 target->max_ti_iu_len, DMA_FROM_DEVICE);
736 static void srp_completion(struct ib_cq *cq, void *target_ptr)
738 struct srp_target_port *target = target_ptr;
742 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
743 while (ib_poll_cq(cq, 1, &wc) > 0) {
745 printk(KERN_ERR PFX "failed %s status %d\n",
746 wc.wr_id & SRP_OP_RECV ? "receive" : "send",
748 spin_lock_irqsave(target->scsi_host->host_lock, flags);
749 if (target->state == SRP_TARGET_LIVE)
750 schedule_work(&target->work);
751 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
755 if (wc.wr_id & SRP_OP_RECV)
756 srp_handle_recv(target, &wc);
762 static int __srp_post_recv(struct srp_target_port *target)
766 struct ib_recv_wr wr, *bad_wr;
770 next = target->rx_head & (SRP_RQ_SIZE - 1);
771 wr.wr_id = next | SRP_OP_RECV;
772 iu = target->rx_ring[next];
775 list.length = iu->size;
776 list.lkey = target->srp_host->mr->lkey;
782 ret = ib_post_recv(target->qp, &wr, &bad_wr);
789 static int srp_post_recv(struct srp_target_port *target)
794 spin_lock_irqsave(target->scsi_host->host_lock, flags);
795 ret = __srp_post_recv(target);
796 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
802 * Must be called with target->scsi_host->host_lock held to protect
803 * req_lim and tx_head. Lock cannot be dropped between call here and
804 * call to __srp_post_send().
806 static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
808 if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
811 if (unlikely(target->req_lim < 1)) {
812 if (printk_ratelimit())
813 printk(KERN_DEBUG PFX "Target has req_lim %d\n",
818 return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
822 * Must be called with target->scsi_host->host_lock held to protect
823 * req_lim and tx_head.
825 static int __srp_post_send(struct srp_target_port *target,
826 struct srp_iu *iu, int len)
829 struct ib_send_wr wr, *bad_wr;
834 list.lkey = target->srp_host->mr->lkey;
837 wr.wr_id = target->tx_head & SRP_SQ_SIZE;
840 wr.opcode = IB_WR_SEND;
841 wr.send_flags = IB_SEND_SIGNALED;
843 ret = ib_post_send(target->qp, &wr, &bad_wr);
853 static int srp_queuecommand(struct scsi_cmnd *scmnd,
854 void (*done)(struct scsi_cmnd *))
856 struct srp_target_port *target = host_to_target(scmnd->device->host);
857 struct srp_request *req;
862 if (target->state == SRP_TARGET_CONNECTING)
865 if (target->state == SRP_TARGET_DEAD ||
866 target->state == SRP_TARGET_REMOVED) {
867 scmnd->result = DID_BAD_TARGET << 16;
872 iu = __srp_get_tx_iu(target);
876 dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
877 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
879 req = list_entry(target->free_reqs.next, struct srp_request, list);
881 scmnd->scsi_done = done;
883 scmnd->host_scribble = (void *) (long) req->index;
886 memset(cmd, 0, sizeof *cmd);
888 cmd->opcode = SRP_CMD;
889 cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
890 cmd->tag = req->index;
891 memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
896 req->tsk_mgmt = NULL;
898 len = srp_map_data(scmnd, target, req);
900 printk(KERN_ERR PFX "Failed to map data\n");
904 if (__srp_post_recv(target)) {
905 printk(KERN_ERR PFX "Recv failed\n");
909 dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
910 SRP_MAX_IU_LEN, DMA_TO_DEVICE);
912 if (__srp_post_send(target, iu, len)) {
913 printk(KERN_ERR PFX "Send failed\n");
917 list_move_tail(&req->list, &target->req_queue);
922 srp_unmap_data(scmnd, target, req);
925 return SCSI_MLQUEUE_HOST_BUSY;
928 static int srp_alloc_iu_bufs(struct srp_target_port *target)
932 for (i = 0; i < SRP_RQ_SIZE; ++i) {
933 target->rx_ring[i] = srp_alloc_iu(target->srp_host,
934 target->max_ti_iu_len,
935 GFP_KERNEL, DMA_FROM_DEVICE);
936 if (!target->rx_ring[i])
940 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
941 target->tx_ring[i] = srp_alloc_iu(target->srp_host,
943 GFP_KERNEL, DMA_TO_DEVICE);
944 if (!target->tx_ring[i])
951 for (i = 0; i < SRP_RQ_SIZE; ++i) {
952 srp_free_iu(target->srp_host, target->rx_ring[i]);
953 target->rx_ring[i] = NULL;
956 for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
957 srp_free_iu(target->srp_host, target->tx_ring[i]);
958 target->tx_ring[i] = NULL;
964 static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
965 struct ib_cm_event *event,
966 struct srp_target_port *target)
968 struct ib_class_port_info *cpi;
971 switch (event->param.rej_rcvd.reason) {
972 case IB_CM_REJ_PORT_CM_REDIRECT:
973 cpi = event->param.rej_rcvd.ari;
974 target->path.dlid = cpi->redirect_lid;
975 target->path.pkey = cpi->redirect_pkey;
976 cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
977 memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
979 target->status = target->path.dlid ?
980 SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
983 case IB_CM_REJ_PORT_REDIRECT:
984 if (topspin_workarounds &&
985 !memcmp(&target->ioc_guid, topspin_oui, 3)) {
987 * Topspin/Cisco SRP gateways incorrectly send
988 * reject reason code 25 when they mean 24
991 memcpy(target->path.dgid.raw,
992 event->param.rej_rcvd.ari, 16);
994 printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
995 (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
996 (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
998 target->status = SRP_PORT_REDIRECT;
1000 printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1001 target->status = -ECONNRESET;
1005 case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1006 printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1007 target->status = -ECONNRESET;
1010 case IB_CM_REJ_CONSUMER_DEFINED:
1011 opcode = *(u8 *) event->private_data;
1012 if (opcode == SRP_LOGIN_REJ) {
1013 struct srp_login_rej *rej = event->private_data;
1014 u32 reason = be32_to_cpu(rej->reason);
1016 if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1017 printk(KERN_WARNING PFX
1018 "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1020 printk(KERN_WARNING PFX
1021 "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1023 printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
1024 " opcode 0x%02x\n", opcode);
1025 target->status = -ECONNRESET;
1029 printk(KERN_WARNING " REJ reason 0x%x\n",
1030 event->param.rej_rcvd.reason);
1031 target->status = -ECONNRESET;
1035 static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
1037 struct srp_target_port *target = cm_id->context;
1038 struct ib_qp_attr *qp_attr = NULL;
1043 switch (event->event) {
1044 case IB_CM_REQ_ERROR:
1045 printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
1047 target->status = -ECONNRESET;
1050 case IB_CM_REP_RECEIVED:
1052 opcode = *(u8 *) event->private_data;
1054 if (opcode == SRP_LOGIN_RSP) {
1055 struct srp_login_rsp *rsp = event->private_data;
1057 target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
1058 target->req_lim = be32_to_cpu(rsp->req_lim_delta);
1060 target->scsi_host->can_queue = min(target->req_lim,
1061 target->scsi_host->can_queue);
1063 printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
1064 target->status = -ECONNRESET;
1068 target->status = srp_alloc_iu_bufs(target);
1072 qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
1074 target->status = -ENOMEM;
1078 qp_attr->qp_state = IB_QPS_RTR;
1079 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1083 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1087 target->status = srp_post_recv(target);
1091 qp_attr->qp_state = IB_QPS_RTS;
1092 target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
1096 target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
1100 target->status = ib_send_cm_rtu(cm_id, NULL, 0);
1106 case IB_CM_REJ_RECEIVED:
1107 printk(KERN_DEBUG PFX "REJ received\n");
1110 srp_cm_rej_handler(cm_id, event, target);
1113 case IB_CM_MRA_RECEIVED:
1114 printk(KERN_ERR PFX "MRA received\n");
1117 case IB_CM_DREP_RECEIVED:
1120 case IB_CM_TIMEWAIT_EXIT:
1121 printk(KERN_ERR PFX "connection closed\n");
1128 printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
1133 complete(&target->done);
1140 static int srp_send_tsk_mgmt(struct srp_target_port *target,
1141 struct srp_request *req, u8 func)
1144 struct srp_tsk_mgmt *tsk_mgmt;
1146 spin_lock_irq(target->scsi_host->host_lock);
1148 if (target->state == SRP_TARGET_DEAD ||
1149 target->state == SRP_TARGET_REMOVED) {
1150 req->scmnd->result = DID_BAD_TARGET << 16;
1154 init_completion(&req->done);
1156 iu = __srp_get_tx_iu(target);
1161 memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
1163 tsk_mgmt->opcode = SRP_TSK_MGMT;
1164 tsk_mgmt->lun = cpu_to_be64((u64) req->scmnd->device->lun << 48);
1165 tsk_mgmt->tag = req->index | SRP_TAG_TSK_MGMT;
1166 tsk_mgmt->tsk_mgmt_func = func;
1167 tsk_mgmt->task_tag = req->index;
1169 if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
1174 spin_unlock_irq(target->scsi_host->host_lock);
1176 if (!wait_for_completion_timeout(&req->done,
1177 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1183 spin_unlock_irq(target->scsi_host->host_lock);
1187 static int srp_find_req(struct srp_target_port *target,
1188 struct scsi_cmnd *scmnd,
1189 struct srp_request **req)
1191 if (scmnd->host_scribble == (void *) -1L)
1194 *req = &target->req_ring[(long) scmnd->host_scribble];
1199 static int srp_abort(struct scsi_cmnd *scmnd)
1201 struct srp_target_port *target = host_to_target(scmnd->device->host);
1202 struct srp_request *req;
1205 printk(KERN_ERR "SRP abort called\n");
1207 if (srp_find_req(target, scmnd, &req))
1209 if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
1212 spin_lock_irq(target->scsi_host->host_lock);
1214 if (req->cmd_done) {
1215 srp_remove_req(target, req);
1216 scmnd->scsi_done(scmnd);
1217 } else if (!req->tsk_status) {
1218 srp_remove_req(target, req);
1219 scmnd->result = DID_ABORT << 16;
1223 spin_unlock_irq(target->scsi_host->host_lock);
1228 static int srp_reset_device(struct scsi_cmnd *scmnd)
1230 struct srp_target_port *target = host_to_target(scmnd->device->host);
1231 struct srp_request *req, *tmp;
1233 printk(KERN_ERR "SRP reset_device called\n");
1235 if (srp_find_req(target, scmnd, &req))
1237 if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
1239 if (req->tsk_status)
1242 spin_lock_irq(target->scsi_host->host_lock);
1244 list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1245 if (req->scmnd->device == scmnd->device) {
1246 req->scmnd->result = DID_RESET << 16;
1247 scmnd->scsi_done(scmnd);
1248 srp_remove_req(target, req);
1251 spin_unlock_irq(target->scsi_host->host_lock);
1256 static int srp_reset_host(struct scsi_cmnd *scmnd)
1258 struct srp_target_port *target = host_to_target(scmnd->device->host);
1261 printk(KERN_ERR PFX "SRP reset_host called\n");
1263 if (!srp_reconnect_target(target))
1269 static ssize_t show_id_ext(struct class_device *cdev, char *buf)
1271 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1273 if (target->state == SRP_TARGET_DEAD ||
1274 target->state == SRP_TARGET_REMOVED)
1277 return sprintf(buf, "0x%016llx\n",
1278 (unsigned long long) be64_to_cpu(target->id_ext));
1281 static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
1283 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1285 if (target->state == SRP_TARGET_DEAD ||
1286 target->state == SRP_TARGET_REMOVED)
1289 return sprintf(buf, "0x%016llx\n",
1290 (unsigned long long) be64_to_cpu(target->ioc_guid));
1293 static ssize_t show_service_id(struct class_device *cdev, char *buf)
1295 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1297 if (target->state == SRP_TARGET_DEAD ||
1298 target->state == SRP_TARGET_REMOVED)
1301 return sprintf(buf, "0x%016llx\n",
1302 (unsigned long long) be64_to_cpu(target->service_id));
1305 static ssize_t show_pkey(struct class_device *cdev, char *buf)
1307 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1309 if (target->state == SRP_TARGET_DEAD ||
1310 target->state == SRP_TARGET_REMOVED)
1313 return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
1316 static ssize_t show_dgid(struct class_device *cdev, char *buf)
1318 struct srp_target_port *target = host_to_target(class_to_shost(cdev));
1320 if (target->state == SRP_TARGET_DEAD ||
1321 target->state == SRP_TARGET_REMOVED)
1324 return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1325 be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
1326 be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
1327 be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
1328 be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
1329 be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
1330 be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
1331 be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
1332 be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
1335 static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
1336 static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
1337 static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
1338 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1339 static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
1341 static struct class_device_attribute *srp_host_attrs[] = {
1342 &class_device_attr_id_ext,
1343 &class_device_attr_ioc_guid,
1344 &class_device_attr_service_id,
1345 &class_device_attr_pkey,
1346 &class_device_attr_dgid,
1350 static struct scsi_host_template srp_template = {
1351 .module = THIS_MODULE,
1353 .info = srp_target_info,
1354 .queuecommand = srp_queuecommand,
1355 .eh_abort_handler = srp_abort,
1356 .eh_device_reset_handler = srp_reset_device,
1357 .eh_host_reset_handler = srp_reset_host,
1358 .can_queue = SRP_SQ_SIZE,
1360 .sg_tablesize = SRP_MAX_INDIRECT,
1361 .cmd_per_lun = SRP_SQ_SIZE,
1362 .use_clustering = ENABLE_CLUSTERING,
1363 .shost_attrs = srp_host_attrs
1366 static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
1368 sprintf(target->target_name, "SRP.T10:%016llX",
1369 (unsigned long long) be64_to_cpu(target->id_ext));
1371 if (scsi_add_host(target->scsi_host, host->dev->dma_device))
1374 mutex_lock(&host->target_mutex);
1375 list_add_tail(&target->list, &host->target_list);
1376 mutex_unlock(&host->target_mutex);
1378 target->state = SRP_TARGET_LIVE;
1380 /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
1381 scsi_scan_target(&target->scsi_host->shost_gendev,
1382 0, target->scsi_id, ~0, 0);
1387 static void srp_release_class_dev(struct class_device *class_dev)
1389 struct srp_host *host =
1390 container_of(class_dev, struct srp_host, class_dev);
1392 complete(&host->released);
1395 static struct class srp_class = {
1396 .name = "infiniband_srp",
1397 .release = srp_release_class_dev
1401 * Target ports are added by writing
1403 * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
1404 * pkey=<P_Key>,service_id=<service ID>
1406 * to the add_target sysfs attribute.
1410 SRP_OPT_ID_EXT = 1 << 0,
1411 SRP_OPT_IOC_GUID = 1 << 1,
1412 SRP_OPT_DGID = 1 << 2,
1413 SRP_OPT_PKEY = 1 << 3,
1414 SRP_OPT_SERVICE_ID = 1 << 4,
1415 SRP_OPT_MAX_SECT = 1 << 5,
1416 SRP_OPT_ALL = (SRP_OPT_ID_EXT |
1420 SRP_OPT_SERVICE_ID),
1423 static match_table_t srp_opt_tokens = {
1424 { SRP_OPT_ID_EXT, "id_ext=%s" },
1425 { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
1426 { SRP_OPT_DGID, "dgid=%s" },
1427 { SRP_OPT_PKEY, "pkey=%x" },
1428 { SRP_OPT_SERVICE_ID, "service_id=%s" },
1429 { SRP_OPT_MAX_SECT, "max_sect=%d" },
1430 { SRP_OPT_ERR, NULL }
1433 static int srp_parse_options(const char *buf, struct srp_target_port *target)
1435 char *options, *sep_opt;
1438 substring_t args[MAX_OPT_ARGS];
1444 options = kstrdup(buf, GFP_KERNEL);
1449 while ((p = strsep(&sep_opt, ",")) != NULL) {
1453 token = match_token(p, srp_opt_tokens, args);
1457 case SRP_OPT_ID_EXT:
1458 p = match_strdup(args);
1459 target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
1463 case SRP_OPT_IOC_GUID:
1464 p = match_strdup(args);
1465 target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
1470 p = match_strdup(args);
1471 if (strlen(p) != 32) {
1472 printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1477 for (i = 0; i < 16; ++i) {
1478 strlcpy(dgid, p + i * 2, 3);
1479 target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
1485 if (match_hex(args, &token)) {
1486 printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
1489 target->path.pkey = cpu_to_be16(token);
1492 case SRP_OPT_SERVICE_ID:
1493 p = match_strdup(args);
1494 target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1498 case SRP_OPT_MAX_SECT:
1499 if (match_int(args, &token)) {
1500 printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
1503 target->scsi_host->max_sectors = token;
1507 printk(KERN_WARNING PFX "unknown parameter or missing value "
1508 "'%s' in target creation request\n", p);
1513 if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
1516 for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
1517 if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
1518 !(srp_opt_tokens[i].token & opt_mask))
1519 printk(KERN_WARNING PFX "target creation request is "
1520 "missing parameter '%s'\n",
1521 srp_opt_tokens[i].pattern);
1528 static ssize_t srp_create_target(struct class_device *class_dev,
1529 const char *buf, size_t count)
1531 struct srp_host *host =
1532 container_of(class_dev, struct srp_host, class_dev);
1533 struct Scsi_Host *target_host;
1534 struct srp_target_port *target;
1538 target_host = scsi_host_alloc(&srp_template,
1539 sizeof (struct srp_target_port));
1543 target_host->max_lun = SRP_MAX_LUN;
1545 target = host_to_target(target_host);
1546 memset(target, 0, sizeof *target);
1548 target->scsi_host = target_host;
1549 target->srp_host = host;
1551 INIT_WORK(&target->work, srp_reconnect_work, target);
1553 INIT_LIST_HEAD(&target->free_reqs);
1554 INIT_LIST_HEAD(&target->req_queue);
1555 for (i = 0; i < SRP_SQ_SIZE; ++i) {
1556 target->req_ring[i].index = i;
1557 list_add_tail(&target->req_ring[i].list, &target->free_reqs);
1560 ret = srp_parse_options(buf, target);
1564 ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
1566 printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
1567 "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
1568 (unsigned long long) be64_to_cpu(target->id_ext),
1569 (unsigned long long) be64_to_cpu(target->ioc_guid),
1570 be16_to_cpu(target->path.pkey),
1571 (unsigned long long) be64_to_cpu(target->service_id),
1572 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
1573 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
1574 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
1575 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
1576 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
1577 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
1578 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
1579 (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
1581 ret = srp_create_target_ib(target);
1585 target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
1586 if (IS_ERR(target->cm_id)) {
1587 ret = PTR_ERR(target->cm_id);
1591 ret = srp_connect_target(target);
1593 printk(KERN_ERR PFX "Connection failed\n");
1597 ret = srp_add_target(host, target);
1599 goto err_disconnect;
1604 srp_disconnect_target(target);
1607 ib_destroy_cm_id(target->cm_id);
1610 srp_free_target_ib(target);
1613 scsi_host_put(target_host);
1618 static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1620 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
1622 struct srp_host *host =
1623 container_of(class_dev, struct srp_host, class_dev);
1625 return sprintf(buf, "%s\n", host->dev->name);
1628 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1630 static ssize_t show_port(struct class_device *class_dev, char *buf)
1632 struct srp_host *host =
1633 container_of(class_dev, struct srp_host, class_dev);
1635 return sprintf(buf, "%d\n", host->port);
1638 static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1640 static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
1642 struct srp_host *host;
1644 host = kzalloc(sizeof *host, GFP_KERNEL);
1648 INIT_LIST_HEAD(&host->target_list);
1649 mutex_init(&host->target_mutex);
1650 init_completion(&host->released);
1654 host->initiator_port_id[7] = port;
1655 memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
1657 host->pd = ib_alloc_pd(device);
1658 if (IS_ERR(host->pd))
1661 host->mr = ib_get_dma_mr(host->pd,
1662 IB_ACCESS_LOCAL_WRITE |
1663 IB_ACCESS_REMOTE_READ |
1664 IB_ACCESS_REMOTE_WRITE);
1665 if (IS_ERR(host->mr))
1668 host->class_dev.class = &srp_class;
1669 host->class_dev.dev = device->dma_device;
1670 snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
1671 device->name, port);
1673 if (class_device_register(&host->class_dev))
1675 if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
1677 if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
1679 if (class_device_create_file(&host->class_dev, &class_device_attr_port))
1685 class_device_unregister(&host->class_dev);
1688 ib_dereg_mr(host->mr);
1691 ib_dealloc_pd(host->pd);
1699 static void srp_add_one(struct ib_device *device)
1701 struct list_head *dev_list;
1702 struct srp_host *host;
1705 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1709 INIT_LIST_HEAD(dev_list);
1711 if (device->node_type == IB_NODE_SWITCH) {
1716 e = device->phys_port_cnt;
1719 for (p = s; p <= e; ++p) {
1720 host = srp_add_port(device, p);
1722 list_add_tail(&host->list, dev_list);
1725 ib_set_client_data(device, &srp_client, dev_list);
1728 static void srp_remove_one(struct ib_device *device)
1730 struct list_head *dev_list;
1731 struct srp_host *host, *tmp_host;
1732 LIST_HEAD(target_list);
1733 struct srp_target_port *target, *tmp_target;
1734 unsigned long flags;
1736 dev_list = ib_get_client_data(device, &srp_client);
1738 list_for_each_entry_safe(host, tmp_host, dev_list, list) {
1739 class_device_unregister(&host->class_dev);
1741 * Wait for the sysfs entry to go away, so that no new
1742 * target ports can be created.
1744 wait_for_completion(&host->released);
1747 * Mark all target ports as removed, so we stop queueing
1748 * commands and don't try to reconnect.
1750 mutex_lock(&host->target_mutex);
1751 list_for_each_entry_safe(target, tmp_target,
1752 &host->target_list, list) {
1753 spin_lock_irqsave(target->scsi_host->host_lock, flags);
1754 if (target->state != SRP_TARGET_REMOVED)
1755 target->state = SRP_TARGET_REMOVED;
1756 spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
1758 mutex_unlock(&host->target_mutex);
1761 * Wait for any reconnection tasks that may have
1762 * started before we marked our target ports as
1763 * removed, and any target port removal tasks.
1765 flush_scheduled_work();
1767 list_for_each_entry_safe(target, tmp_target,
1768 &host->target_list, list) {
1769 scsi_remove_host(target->scsi_host);
1770 srp_disconnect_target(target);
1771 ib_destroy_cm_id(target->cm_id);
1772 srp_free_target_ib(target);
1773 scsi_host_put(target->scsi_host);
1776 ib_dereg_mr(host->mr);
1777 ib_dealloc_pd(host->pd);
1784 static int __init srp_init_module(void)
1788 ret = class_register(&srp_class);
1790 printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
1794 ret = ib_register_client(&srp_client);
1796 printk(KERN_ERR PFX "couldn't register IB client\n");
1797 class_unregister(&srp_class);
1804 static void __exit srp_cleanup_module(void)
1806 ib_unregister_client(&srp_client);
1807 class_unregister(&srp_class);
1810 module_init(srp_init_module);
1811 module_exit(srp_cleanup_module);