2 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
4 * Copyright (c) 2013-2014 Mellanox Technologies. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/kernel.h>
35 #include <linux/module.h>
36 #include <linux/slab.h>
37 #include <linux/delay.h>
39 #include "iscsi_iser.h"
41 #define ISCSI_ISER_MAX_CONN 8
42 #define ISER_MAX_RX_LEN (ISER_QP_MAX_RECV_DTOS * ISCSI_ISER_MAX_CONN)
43 #define ISER_MAX_TX_LEN (ISER_QP_MAX_REQ_DTOS * ISCSI_ISER_MAX_CONN)
44 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_LEN + ISER_MAX_TX_LEN + \
47 static void iser_qp_event_callback(struct ib_event *cause, void *context)
49 iser_err("qp event %s (%d)\n",
50 ib_event_msg(cause->event), cause->event);
53 static void iser_event_handler(struct ib_event_handler *handler,
54 struct ib_event *event)
56 iser_err("async event %s (%d) on device %s port %d\n",
57 ib_event_msg(event->event), event->event,
58 event->device->name, event->element.port_num);
62 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
63 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
66 * returns 0 on success, -1 on failure
68 static int iser_create_device_ib_res(struct iser_device *device)
70 struct ib_device *ib_dev = device->ib_device;
73 ret = iser_assign_reg_ops(device);
77 device->comps_used = min_t(int, num_online_cpus(),
78 ib_dev->num_comp_vectors);
80 device->comps = kcalloc(device->comps_used, sizeof(*device->comps),
85 max_cqe = min(ISER_MAX_CQ_LEN, ib_dev->attrs.max_cqe);
87 iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n",
88 device->comps_used, ib_dev->name,
89 ib_dev->num_comp_vectors, max_cqe);
91 device->pd = ib_alloc_pd(ib_dev,
92 iser_always_reg ? 0 : IB_PD_UNSAFE_GLOBAL_RKEY);
93 if (IS_ERR(device->pd))
96 for (i = 0; i < device->comps_used; i++) {
97 struct iser_comp *comp = &device->comps[i];
99 comp->cq = ib_alloc_cq(ib_dev, comp, max_cqe, i,
101 if (IS_ERR(comp->cq)) {
107 INIT_IB_EVENT_HANDLER(&device->event_handler, ib_dev,
109 ib_register_event_handler(&device->event_handler);
113 for (i = 0; i < device->comps_used; i++) {
114 struct iser_comp *comp = &device->comps[i];
117 ib_free_cq(comp->cq);
119 ib_dealloc_pd(device->pd);
121 kfree(device->comps);
123 iser_err("failed to allocate an IB resource\n");
128 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
129 * CQ and PD created with the device associated with the adapator.
131 static void iser_free_device_ib_res(struct iser_device *device)
135 for (i = 0; i < device->comps_used; i++) {
136 struct iser_comp *comp = &device->comps[i];
138 ib_free_cq(comp->cq);
142 ib_unregister_event_handler(&device->event_handler);
143 ib_dealloc_pd(device->pd);
145 kfree(device->comps);
146 device->comps = NULL;
151 * iser_alloc_fmr_pool - Creates FMR pool and page_vector
153 * returns 0 on success, or errno code on failure
155 int iser_alloc_fmr_pool(struct ib_conn *ib_conn,
159 struct iser_device *device = ib_conn->device;
160 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
161 struct iser_page_vec *page_vec;
162 struct iser_fr_desc *desc;
163 struct ib_fmr_pool *fmr_pool;
164 struct ib_fmr_pool_param params;
167 INIT_LIST_HEAD(&fr_pool->list);
168 spin_lock_init(&fr_pool->lock);
170 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
174 page_vec = kmalloc(sizeof(*page_vec) + (sizeof(u64) * size),
181 page_vec->pages = (u64 *)(page_vec + 1);
183 params.page_shift = SHIFT_4K;
184 params.max_pages_per_fmr = size;
185 /* make the pool size twice the max number of SCSI commands *
186 * the ML is expected to queue, watermark for unmap at 50% */
187 params.pool_size = cmds_max * 2;
188 params.dirty_watermark = cmds_max;
190 params.flush_function = NULL;
191 params.access = (IB_ACCESS_LOCAL_WRITE |
192 IB_ACCESS_REMOTE_WRITE |
193 IB_ACCESS_REMOTE_READ);
195 fmr_pool = ib_create_fmr_pool(device->pd, ¶ms);
196 if (IS_ERR(fmr_pool)) {
197 ret = PTR_ERR(fmr_pool);
198 iser_err("FMR allocation failed, err %d\n", ret);
202 desc->rsc.page_vec = page_vec;
203 desc->rsc.fmr_pool = fmr_pool;
204 list_add(&desc->list, &fr_pool->list);
217 * iser_free_fmr_pool - releases the FMR pool and page vec
219 void iser_free_fmr_pool(struct ib_conn *ib_conn)
221 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
222 struct iser_fr_desc *desc;
224 desc = list_first_entry(&fr_pool->list,
225 struct iser_fr_desc, list);
226 list_del(&desc->list);
228 iser_info("freeing conn %p fmr pool %p\n",
229 ib_conn, desc->rsc.fmr_pool);
231 ib_destroy_fmr_pool(desc->rsc.fmr_pool);
232 kfree(desc->rsc.page_vec);
237 iser_alloc_reg_res(struct iser_device *device,
239 struct iser_reg_resources *res,
242 struct ib_device *ib_dev = device->ib_device;
243 enum ib_mr_type mr_type;
246 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)
247 mr_type = IB_MR_TYPE_SG_GAPS;
249 mr_type = IB_MR_TYPE_MEM_REG;
251 res->mr = ib_alloc_mr(pd, mr_type, size);
252 if (IS_ERR(res->mr)) {
253 ret = PTR_ERR(res->mr);
254 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
263 iser_free_reg_res(struct iser_reg_resources *rsc)
265 ib_dereg_mr(rsc->mr);
269 iser_alloc_pi_ctx(struct iser_device *device,
271 struct iser_fr_desc *desc,
274 struct iser_pi_context *pi_ctx = NULL;
277 desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
281 pi_ctx = desc->pi_ctx;
283 ret = iser_alloc_reg_res(device, pd, &pi_ctx->rsc, size);
285 iser_err("failed to allocate reg_resources\n");
286 goto alloc_reg_res_err;
289 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
290 if (IS_ERR(pi_ctx->sig_mr)) {
291 ret = PTR_ERR(pi_ctx->sig_mr);
294 pi_ctx->sig_mr_valid = 0;
295 desc->pi_ctx->sig_protected = 0;
300 iser_free_reg_res(&pi_ctx->rsc);
308 iser_free_pi_ctx(struct iser_pi_context *pi_ctx)
310 iser_free_reg_res(&pi_ctx->rsc);
311 ib_dereg_mr(pi_ctx->sig_mr);
315 static struct iser_fr_desc *
316 iser_create_fastreg_desc(struct iser_device *device,
321 struct iser_fr_desc *desc;
324 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
326 return ERR_PTR(-ENOMEM);
328 ret = iser_alloc_reg_res(device, pd, &desc->rsc, size);
330 goto reg_res_alloc_failure;
333 ret = iser_alloc_pi_ctx(device, pd, desc, size);
335 goto pi_ctx_alloc_failure;
340 pi_ctx_alloc_failure:
341 iser_free_reg_res(&desc->rsc);
342 reg_res_alloc_failure:
349 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors
350 * for fast registration work requests.
351 * returns 0 on success, or errno code on failure
353 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
357 struct iser_device *device = ib_conn->device;
358 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
359 struct iser_fr_desc *desc;
362 INIT_LIST_HEAD(&fr_pool->list);
363 INIT_LIST_HEAD(&fr_pool->all_list);
364 spin_lock_init(&fr_pool->lock);
366 for (i = 0; i < cmds_max; i++) {
367 desc = iser_create_fastreg_desc(device, device->pd,
368 ib_conn->pi_support, size);
374 list_add_tail(&desc->list, &fr_pool->list);
375 list_add_tail(&desc->all_list, &fr_pool->all_list);
382 iser_free_fastreg_pool(ib_conn);
387 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
389 void iser_free_fastreg_pool(struct ib_conn *ib_conn)
391 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
392 struct iser_fr_desc *desc, *tmp;
395 if (list_empty(&fr_pool->all_list))
398 iser_info("freeing conn %p fr pool\n", ib_conn);
400 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {
401 list_del(&desc->all_list);
402 iser_free_reg_res(&desc->rsc);
404 iser_free_pi_ctx(desc->pi_ctx);
409 if (i < fr_pool->size)
410 iser_warn("pool still has %d regions registered\n",
415 * iser_create_ib_conn_res - Queue-Pair (QP)
417 * returns 0 on success, -1 on failure
419 static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
421 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
422 struct iser_device *device;
423 struct ib_device *ib_dev;
424 struct ib_qp_init_attr init_attr;
426 int index, min_index = 0;
428 BUG_ON(ib_conn->device == NULL);
430 device = ib_conn->device;
431 ib_dev = device->ib_device;
433 memset(&init_attr, 0, sizeof init_attr);
435 mutex_lock(&ig.connlist_mutex);
436 /* select the CQ with the minimal number of usages */
437 for (index = 0; index < device->comps_used; index++) {
438 if (device->comps[index].active_qps <
439 device->comps[min_index].active_qps)
442 ib_conn->comp = &device->comps[min_index];
443 ib_conn->comp->active_qps++;
444 mutex_unlock(&ig.connlist_mutex);
445 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn);
447 init_attr.event_handler = iser_qp_event_callback;
448 init_attr.qp_context = (void *)ib_conn;
449 init_attr.send_cq = ib_conn->comp->cq;
450 init_attr.recv_cq = ib_conn->comp->cq;
451 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
452 init_attr.cap.max_send_sge = 2;
453 init_attr.cap.max_recv_sge = 1;
454 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
455 init_attr.qp_type = IB_QPT_RC;
456 if (ib_conn->pi_support) {
457 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
458 init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
459 iser_conn->max_cmds =
460 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS);
462 if (ib_dev->attrs.max_qp_wr > ISER_QP_MAX_REQ_DTOS) {
463 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
464 iser_conn->max_cmds =
465 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS);
467 init_attr.cap.max_send_wr = ib_dev->attrs.max_qp_wr;
468 iser_conn->max_cmds =
469 ISER_GET_MAX_XMIT_CMDS(ib_dev->attrs.max_qp_wr);
470 iser_dbg("device %s supports max_send_wr %d\n",
471 device->ib_device->name, ib_dev->attrs.max_qp_wr);
475 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
479 ib_conn->qp = ib_conn->cma_id->qp;
480 iser_info("setting conn %p cma_id %p qp %p\n",
481 ib_conn, ib_conn->cma_id,
482 ib_conn->cma_id->qp);
486 mutex_lock(&ig.connlist_mutex);
487 ib_conn->comp->active_qps--;
488 mutex_unlock(&ig.connlist_mutex);
489 iser_err("unable to alloc mem or create resource, err %d\n", ret);
495 * based on the resolved device node GUID see if there already allocated
496 * device for this device. If there's no such, create one.
499 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
501 struct iser_device *device;
503 mutex_lock(&ig.device_list_mutex);
505 list_for_each_entry(device, &ig.device_list, ig_list)
506 /* find if there's a match using the node GUID */
507 if (device->ib_device->node_guid == cma_id->device->node_guid)
510 device = kzalloc(sizeof *device, GFP_KERNEL);
514 /* assign this device to the device */
515 device->ib_device = cma_id->device;
516 /* init the device and link it into ig device list */
517 if (iser_create_device_ib_res(device)) {
522 list_add(&device->ig_list, &ig.device_list);
527 mutex_unlock(&ig.device_list_mutex);
531 /* if there's no demand for this device, release it */
532 static void iser_device_try_release(struct iser_device *device)
534 mutex_lock(&ig.device_list_mutex);
536 iser_info("device %p refcount %d\n", device, device->refcount);
537 if (!device->refcount) {
538 iser_free_device_ib_res(device);
539 list_del(&device->ig_list);
542 mutex_unlock(&ig.device_list_mutex);
546 * Called with state mutex held
548 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn,
549 enum iser_conn_state comp,
550 enum iser_conn_state exch)
554 ret = (iser_conn->state == comp);
556 iser_conn->state = exch;
561 void iser_release_work(struct work_struct *work)
563 struct iser_conn *iser_conn;
565 iser_conn = container_of(work, struct iser_conn, release_work);
567 /* Wait for conn_stop to complete */
568 wait_for_completion(&iser_conn->stop_completion);
569 /* Wait for IB resouces cleanup to complete */
570 wait_for_completion(&iser_conn->ib_completion);
572 mutex_lock(&iser_conn->state_mutex);
573 iser_conn->state = ISER_CONN_DOWN;
574 mutex_unlock(&iser_conn->state_mutex);
576 iser_conn_release(iser_conn);
580 * iser_free_ib_conn_res - release IB related resources
581 * @iser_conn: iser connection struct
582 * @destroy: indicator if we need to try to release the
583 * iser device and memory regoins pool (only iscsi
584 * shutdown and DEVICE_REMOVAL will use this).
586 * This routine is called with the iser state mutex held
587 * so the cm_id removal is out of here. It is Safe to
588 * be invoked multiple times.
590 static void iser_free_ib_conn_res(struct iser_conn *iser_conn,
593 struct ib_conn *ib_conn = &iser_conn->ib_conn;
594 struct iser_device *device = ib_conn->device;
596 iser_info("freeing conn %p cma_id %p qp %p\n",
597 iser_conn, ib_conn->cma_id, ib_conn->qp);
599 if (ib_conn->qp != NULL) {
600 mutex_lock(&ig.connlist_mutex);
601 ib_conn->comp->active_qps--;
602 mutex_unlock(&ig.connlist_mutex);
603 rdma_destroy_qp(ib_conn->cma_id);
608 if (iser_conn->rx_descs)
609 iser_free_rx_descriptors(iser_conn);
611 if (device != NULL) {
612 iser_device_try_release(device);
613 ib_conn->device = NULL;
619 * Frees all conn objects and deallocs conn descriptor
621 void iser_conn_release(struct iser_conn *iser_conn)
623 struct ib_conn *ib_conn = &iser_conn->ib_conn;
625 mutex_lock(&ig.connlist_mutex);
626 list_del(&iser_conn->conn_list);
627 mutex_unlock(&ig.connlist_mutex);
629 mutex_lock(&iser_conn->state_mutex);
630 /* In case we endup here without ep_disconnect being invoked. */
631 if (iser_conn->state != ISER_CONN_DOWN) {
632 iser_warn("iser conn %p state %d, expected state down.\n",
633 iser_conn, iser_conn->state);
634 iscsi_destroy_endpoint(iser_conn->ep);
635 iser_conn->state = ISER_CONN_DOWN;
638 * In case we never got to bind stage, we still need to
639 * release IB resources (which is safe to call more than once).
641 iser_free_ib_conn_res(iser_conn, true);
642 mutex_unlock(&iser_conn->state_mutex);
644 if (ib_conn->cma_id != NULL) {
645 rdma_destroy_id(ib_conn->cma_id);
646 ib_conn->cma_id = NULL;
653 * triggers start of the disconnect procedures and wait for them to be done
654 * Called with state mutex held
656 int iser_conn_terminate(struct iser_conn *iser_conn)
658 struct ib_conn *ib_conn = &iser_conn->ib_conn;
661 /* terminate the iser conn only if the conn state is UP */
662 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP,
663 ISER_CONN_TERMINATING))
666 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
668 /* suspend queuing of new iscsi commands */
669 if (iser_conn->iscsi_conn)
670 iscsi_suspend_queue(iser_conn->iscsi_conn);
673 * In case we didn't already clean up the cma_id (peer initiated
674 * a disconnection), we need to Cause the CMA to change the QP
677 if (ib_conn->cma_id) {
678 err = rdma_disconnect(ib_conn->cma_id);
680 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
683 /* block until all flush errors are consumed */
684 ib_drain_sq(ib_conn->qp);
691 * Called with state mutex held
693 static void iser_connect_error(struct rdma_cm_id *cma_id)
695 struct iser_conn *iser_conn;
697 iser_conn = (struct iser_conn *)cma_id->context;
698 iser_conn->state = ISER_CONN_TERMINATING;
702 iser_calc_scsi_params(struct iser_conn *iser_conn,
703 unsigned int max_sectors)
705 struct iser_device *device = iser_conn->ib_conn.device;
706 struct ib_device_attr *attr = &device->ib_device->attrs;
707 unsigned short sg_tablesize, sup_sg_tablesize;
708 unsigned short reserved_mr_pages;
711 * FRs without SG_GAPS or FMRs can only map up to a (device) page per
712 * entry, but if the first entry is misaligned we'll end up using two
713 * entries (head and tail) for a single page worth data, so one
714 * additional entry is required.
716 if ((attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) &&
717 (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG))
718 reserved_mr_pages = 0;
720 reserved_mr_pages = 1;
722 sg_tablesize = DIV_ROUND_UP(max_sectors * 512, SIZE_4K);
723 if (attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)
726 uint, ISCSI_ISER_MAX_SG_TABLESIZE,
727 attr->max_fast_reg_page_list_len - reserved_mr_pages);
729 sup_sg_tablesize = ISCSI_ISER_MAX_SG_TABLESIZE;
731 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize);
732 iser_conn->pages_per_mr =
733 iser_conn->scsi_sg_tablesize + reserved_mr_pages;
737 * Called with state mutex held
739 static void iser_addr_handler(struct rdma_cm_id *cma_id)
741 struct iser_device *device;
742 struct iser_conn *iser_conn;
743 struct ib_conn *ib_conn;
746 iser_conn = (struct iser_conn *)cma_id->context;
747 if (iser_conn->state != ISER_CONN_PENDING)
751 ib_conn = &iser_conn->ib_conn;
752 device = iser_device_find_by_ib_device(cma_id);
754 iser_err("device lookup/creation failed\n");
755 iser_connect_error(cma_id);
759 ib_conn->device = device;
761 /* connection T10-PI support */
762 if (iser_pi_enable) {
763 if (!(device->ib_device->attrs.device_cap_flags &
764 IB_DEVICE_SIGNATURE_HANDOVER)) {
765 iser_warn("T10-PI requested but not supported on %s, "
766 "continue without T10-PI\n",
767 ib_conn->device->ib_device->name);
768 ib_conn->pi_support = false;
770 ib_conn->pi_support = true;
774 iser_calc_scsi_params(iser_conn, iser_max_sectors);
776 ret = rdma_resolve_route(cma_id, 1000);
778 iser_err("resolve route failed: %d\n", ret);
779 iser_connect_error(cma_id);
785 * Called with state mutex held
787 static void iser_route_handler(struct rdma_cm_id *cma_id)
789 struct rdma_conn_param conn_param;
791 struct iser_cm_hdr req_hdr;
792 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
793 struct ib_conn *ib_conn = &iser_conn->ib_conn;
794 struct iser_device *device = ib_conn->device;
796 if (iser_conn->state != ISER_CONN_PENDING)
800 ret = iser_create_ib_conn_res(ib_conn);
804 memset(&conn_param, 0, sizeof conn_param);
805 conn_param.responder_resources = device->ib_device->attrs.max_qp_rd_atom;
806 conn_param.initiator_depth = 1;
807 conn_param.retry_count = 7;
808 conn_param.rnr_retry_count = 6;
810 memset(&req_hdr, 0, sizeof(req_hdr));
811 req_hdr.flags = ISER_ZBVA_NOT_SUP;
812 if (!device->remote_inv_sup)
813 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP;
814 conn_param.private_data = (void *)&req_hdr;
815 conn_param.private_data_len = sizeof(struct iser_cm_hdr);
817 ret = rdma_connect(cma_id, &conn_param);
819 iser_err("failure connecting: %d\n", ret);
825 iser_connect_error(cma_id);
828 static void iser_connected_handler(struct rdma_cm_id *cma_id,
829 const void *private_data)
831 struct iser_conn *iser_conn;
832 struct ib_qp_attr attr;
833 struct ib_qp_init_attr init_attr;
835 iser_conn = (struct iser_conn *)cma_id->context;
836 if (iser_conn->state != ISER_CONN_PENDING)
840 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
841 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
844 u8 flags = *(u8 *)private_data;
846 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP);
849 iser_info("conn %p: negotiated %s invalidation\n",
850 iser_conn, iser_conn->snd_w_inv ? "remote" : "local");
852 iser_conn->state = ISER_CONN_UP;
853 complete(&iser_conn->up_completion);
856 static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
858 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
860 if (iser_conn_terminate(iser_conn)) {
861 if (iser_conn->iscsi_conn)
862 iscsi_conn_failure(iser_conn->iscsi_conn,
863 ISCSI_ERR_CONN_FAILED);
865 iser_err("iscsi_iser connection isn't bound\n");
869 static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
872 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
875 * We are not guaranteed that we visited disconnected_handler
876 * by now, call it here to be safe that we handle CM drep
879 iser_disconnected_handler(cma_id);
880 iser_free_ib_conn_res(iser_conn, destroy);
881 complete(&iser_conn->ib_completion);
884 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
886 struct iser_conn *iser_conn;
889 iser_conn = (struct iser_conn *)cma_id->context;
890 iser_info("%s (%d): status %d conn %p id %p\n",
891 rdma_event_msg(event->event), event->event,
892 event->status, cma_id->context, cma_id);
894 mutex_lock(&iser_conn->state_mutex);
895 switch (event->event) {
896 case RDMA_CM_EVENT_ADDR_RESOLVED:
897 iser_addr_handler(cma_id);
899 case RDMA_CM_EVENT_ROUTE_RESOLVED:
900 iser_route_handler(cma_id);
902 case RDMA_CM_EVENT_ESTABLISHED:
903 iser_connected_handler(cma_id, event->param.conn.private_data);
905 case RDMA_CM_EVENT_REJECTED:
906 iser_info("Connection rejected: %s\n",
907 rdma_reject_msg(cma_id, event->status));
909 case RDMA_CM_EVENT_ADDR_ERROR:
910 case RDMA_CM_EVENT_ROUTE_ERROR:
911 case RDMA_CM_EVENT_CONNECT_ERROR:
912 case RDMA_CM_EVENT_UNREACHABLE:
913 iser_connect_error(cma_id);
915 case RDMA_CM_EVENT_DISCONNECTED:
916 case RDMA_CM_EVENT_ADDR_CHANGE:
917 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
918 iser_cleanup_handler(cma_id, false);
920 case RDMA_CM_EVENT_DEVICE_REMOVAL:
922 * we *must* destroy the device as we cannot rely
923 * on iscsid to be around to initiate error handling.
924 * also if we are not in state DOWN implicitly destroy
927 iser_cleanup_handler(cma_id, true);
928 if (iser_conn->state != ISER_CONN_DOWN) {
929 iser_conn->ib_conn.cma_id = NULL;
934 iser_err("Unexpected RDMA CM event: %s (%d)\n",
935 rdma_event_msg(event->event), event->event);
938 mutex_unlock(&iser_conn->state_mutex);
943 void iser_conn_init(struct iser_conn *iser_conn)
945 struct ib_conn *ib_conn = &iser_conn->ib_conn;
947 iser_conn->state = ISER_CONN_INIT;
948 init_completion(&iser_conn->stop_completion);
949 init_completion(&iser_conn->ib_completion);
950 init_completion(&iser_conn->up_completion);
951 INIT_LIST_HEAD(&iser_conn->conn_list);
952 mutex_init(&iser_conn->state_mutex);
954 ib_conn->post_recv_buf_count = 0;
955 ib_conn->reg_cqe.done = iser_reg_comp;
959 * starts the process of connecting to the target
960 * sleeps until the connection is established or rejected
962 int iser_connect(struct iser_conn *iser_conn,
963 struct sockaddr *src_addr,
964 struct sockaddr *dst_addr,
967 struct ib_conn *ib_conn = &iser_conn->ib_conn;
970 mutex_lock(&iser_conn->state_mutex);
972 sprintf(iser_conn->name, "%pISp", dst_addr);
974 iser_info("connecting to: %s\n", iser_conn->name);
976 /* the device is known only --after-- address resolution */
977 ib_conn->device = NULL;
979 iser_conn->state = ISER_CONN_PENDING;
981 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler,
983 RDMA_PS_TCP, IB_QPT_RC);
984 if (IS_ERR(ib_conn->cma_id)) {
985 err = PTR_ERR(ib_conn->cma_id);
986 iser_err("rdma_create_id failed: %d\n", err);
990 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
992 iser_err("rdma_resolve_addr failed: %d\n", err);
997 wait_for_completion_interruptible(&iser_conn->up_completion);
999 if (iser_conn->state != ISER_CONN_UP) {
1001 goto connect_failure;
1004 mutex_unlock(&iser_conn->state_mutex);
1006 mutex_lock(&ig.connlist_mutex);
1007 list_add(&iser_conn->conn_list, &ig.connlist);
1008 mutex_unlock(&ig.connlist_mutex);
1012 ib_conn->cma_id = NULL;
1014 iser_conn->state = ISER_CONN_DOWN;
1016 mutex_unlock(&iser_conn->state_mutex);
1017 iser_conn_release(iser_conn);
1021 int iser_post_recvl(struct iser_conn *iser_conn)
1023 struct ib_conn *ib_conn = &iser_conn->ib_conn;
1024 struct iser_login_desc *desc = &iser_conn->login_desc;
1025 struct ib_recv_wr wr;
1028 desc->sge.addr = desc->rsp_dma;
1029 desc->sge.length = ISER_RX_LOGIN_SIZE;
1030 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey;
1032 desc->cqe.done = iser_login_rsp;
1033 wr.wr_cqe = &desc->cqe;
1034 wr.sg_list = &desc->sge;
1038 ib_conn->post_recv_buf_count++;
1039 ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL);
1041 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
1042 ib_conn->post_recv_buf_count--;
1048 int iser_post_recvm(struct iser_conn *iser_conn, int count)
1050 struct ib_conn *ib_conn = &iser_conn->ib_conn;
1051 unsigned int my_rx_head = iser_conn->rx_desc_head;
1052 struct iser_rx_desc *rx_desc;
1053 struct ib_recv_wr *wr;
1056 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) {
1057 rx_desc = &iser_conn->rx_descs[my_rx_head];
1058 rx_desc->cqe.done = iser_task_rsp;
1059 wr->wr_cqe = &rx_desc->cqe;
1060 wr->sg_list = &rx_desc->rx_sg;
1063 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask;
1067 wr->next = NULL; /* mark end of work requests list */
1069 ib_conn->post_recv_buf_count += count;
1070 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, NULL);
1072 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
1073 ib_conn->post_recv_buf_count -= count;
1075 iser_conn->rx_desc_head = my_rx_head;
1082 * iser_start_send - Initiate a Send DTO operation
1084 * returns 0 on success, -1 on failure
1086 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
1089 struct ib_send_wr *wr = iser_tx_next_wr(tx_desc);
1092 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
1093 tx_desc->dma_addr, ISER_HEADERS_LEN,
1097 wr->wr_cqe = &tx_desc->cqe;
1098 wr->sg_list = tx_desc->tx_sg;
1099 wr->num_sge = tx_desc->num_sge;
1100 wr->opcode = IB_WR_SEND;
1101 wr->send_flags = signal ? IB_SEND_SIGNALED : 0;
1103 ib_ret = ib_post_send(ib_conn->qp, &tx_desc->wrs[0].send, NULL);
1105 iser_err("ib_post_send failed, ret:%d opcode:%d\n",
1106 ib_ret, wr->opcode);
1111 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
1112 enum iser_data_dir cmd_dir, sector_t *sector)
1114 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
1115 struct iser_fr_desc *desc = reg->mem_h;
1116 unsigned long sector_size = iser_task->sc->device->sector_size;
1117 struct ib_mr_status mr_status;
1120 if (desc && desc->pi_ctx->sig_protected) {
1121 desc->pi_ctx->sig_protected = 0;
1122 ret = ib_check_mr_status(desc->pi_ctx->sig_mr,
1123 IB_MR_CHECK_SIG_STATUS, &mr_status);
1125 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1126 /* Not a lot we can do, return ambiguous guard error */
1131 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1132 sector_t sector_off = mr_status.sig_err.sig_err_offset;
1134 sector_div(sector_off, sector_size + 8);
1135 *sector = scsi_get_lba(iser_task->sc) + sector_off;
1137 pr_err("PI error found type %d at sector %llx "
1138 "expected %x vs actual %x\n",
1139 mr_status.sig_err.err_type,
1140 (unsigned long long)*sector,
1141 mr_status.sig_err.expected,
1142 mr_status.sig_err.actual);
1144 switch (mr_status.sig_err.err_type) {
1145 case IB_SIG_BAD_GUARD:
1147 case IB_SIG_BAD_REFTAG:
1149 case IB_SIG_BAD_APPTAG:
1158 void iser_err_comp(struct ib_wc *wc, const char *type)
1160 if (wc->status != IB_WC_WR_FLUSH_ERR) {
1161 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context);
1163 iser_err("%s failure: %s (%d) vend_err %#x\n", type,
1164 ib_wc_status_msg(wc->status), wc->status,
1167 if (iser_conn->iscsi_conn)
1168 iscsi_conn_failure(iser_conn->iscsi_conn,
1169 ISCSI_ERR_CONN_FAILED);
1171 iser_dbg("%s failure: %s (%d)\n", type,
1172 ib_wc_status_msg(wc->status), wc->status);