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 int iser_cq_poll_limit = 512;
49 static void iser_cq_tasklet_fn(unsigned long data);
50 static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
52 static void iser_cq_event_callback(struct ib_event *cause, void *context)
54 iser_err("got cq event %d \n", cause->event);
57 static void iser_qp_event_callback(struct ib_event *cause, void *context)
59 iser_err("got qp event %d\n",cause->event);
62 static void iser_event_handler(struct ib_event_handler *handler,
63 struct ib_event *event)
65 iser_err("async event %d on device %s port %d\n", event->event,
66 event->device->name, event->element.port_num);
70 * iser_create_device_ib_res - creates Protection Domain (PD), Completion
71 * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
74 * returns 0 on success, -1 on failure
76 static int iser_create_device_ib_res(struct iser_device *device)
78 struct ib_device_attr *dev_attr = &device->dev_attr;
81 ret = ib_query_device(device->ib_device, dev_attr);
83 pr_warn("Query device failed for %s\n", device->ib_device->name);
87 /* Assign function handles - based on FMR support */
88 if (device->ib_device->alloc_fmr && device->ib_device->dealloc_fmr &&
89 device->ib_device->map_phys_fmr && device->ib_device->unmap_fmr) {
90 iser_info("FMR supported, using FMR for registration\n");
91 device->iser_alloc_rdma_reg_res = iser_create_fmr_pool;
92 device->iser_free_rdma_reg_res = iser_free_fmr_pool;
93 device->iser_reg_rdma_mem = iser_reg_rdma_mem_fmr;
94 device->iser_unreg_rdma_mem = iser_unreg_mem_fmr;
96 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
97 iser_info("FastReg supported, using FastReg for registration\n");
98 device->iser_alloc_rdma_reg_res = iser_create_fastreg_pool;
99 device->iser_free_rdma_reg_res = iser_free_fastreg_pool;
100 device->iser_reg_rdma_mem = iser_reg_rdma_mem_fastreg;
101 device->iser_unreg_rdma_mem = iser_unreg_mem_fastreg;
103 iser_err("IB device does not support FMRs nor FastRegs, can't register memory\n");
107 device->comps_used = min_t(int, num_online_cpus(),
108 device->ib_device->num_comp_vectors);
110 device->comps = kcalloc(device->comps_used, sizeof(*device->comps),
115 max_cqe = min(ISER_MAX_CQ_LEN, dev_attr->max_cqe);
117 iser_info("using %d CQs, device %s supports %d vectors max_cqe %d\n",
118 device->comps_used, device->ib_device->name,
119 device->ib_device->num_comp_vectors, max_cqe);
121 device->pd = ib_alloc_pd(device->ib_device);
122 if (IS_ERR(device->pd))
125 for (i = 0; i < device->comps_used; i++) {
126 struct iser_comp *comp = &device->comps[i];
128 comp->device = device;
129 comp->cq = ib_create_cq(device->ib_device,
131 iser_cq_event_callback,
134 if (IS_ERR(comp->cq)) {
139 if (ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP))
142 tasklet_init(&comp->tasklet, iser_cq_tasklet_fn,
143 (unsigned long)comp);
146 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE |
147 IB_ACCESS_REMOTE_WRITE |
148 IB_ACCESS_REMOTE_READ);
149 if (IS_ERR(device->mr))
152 INIT_IB_EVENT_HANDLER(&device->event_handler, device->ib_device,
154 if (ib_register_event_handler(&device->event_handler))
160 ib_dereg_mr(device->mr);
162 for (i = 0; i < device->comps_used; i++)
163 tasklet_kill(&device->comps[i].tasklet);
165 for (i = 0; i < device->comps_used; i++) {
166 struct iser_comp *comp = &device->comps[i];
169 ib_destroy_cq(comp->cq);
171 ib_dealloc_pd(device->pd);
173 kfree(device->comps);
175 iser_err("failed to allocate an IB resource\n");
180 * iser_free_device_ib_res - destroy/dealloc/dereg the DMA MR,
181 * CQ and PD created with the device associated with the adapator.
183 static void iser_free_device_ib_res(struct iser_device *device)
186 BUG_ON(device->mr == NULL);
188 for (i = 0; i < device->comps_used; i++) {
189 struct iser_comp *comp = &device->comps[i];
191 tasklet_kill(&comp->tasklet);
192 ib_destroy_cq(comp->cq);
196 (void)ib_unregister_event_handler(&device->event_handler);
197 (void)ib_dereg_mr(device->mr);
198 (void)ib_dealloc_pd(device->pd);
200 kfree(device->comps);
201 device->comps = NULL;
208 * iser_create_fmr_pool - Creates FMR pool and page_vector
210 * returns 0 on success, or errno code on failure
212 int iser_create_fmr_pool(struct ib_conn *ib_conn, unsigned cmds_max)
214 struct iser_device *device = ib_conn->device;
215 struct ib_fmr_pool_param params;
218 ib_conn->fmr.page_vec = kmalloc(sizeof(*ib_conn->fmr.page_vec) +
219 (sizeof(u64)*(ISCSI_ISER_SG_TABLESIZE + 1)),
221 if (!ib_conn->fmr.page_vec)
224 ib_conn->fmr.page_vec->pages = (u64 *)(ib_conn->fmr.page_vec + 1);
226 params.page_shift = SHIFT_4K;
227 /* when the first/last SG element are not start/end *
228 * page aligned, the map whould be of N+1 pages */
229 params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
230 /* make the pool size twice the max number of SCSI commands *
231 * the ML is expected to queue, watermark for unmap at 50% */
232 params.pool_size = cmds_max * 2;
233 params.dirty_watermark = cmds_max;
235 params.flush_function = NULL;
236 params.access = (IB_ACCESS_LOCAL_WRITE |
237 IB_ACCESS_REMOTE_WRITE |
238 IB_ACCESS_REMOTE_READ);
240 ib_conn->fmr.pool = ib_create_fmr_pool(device->pd, ¶ms);
241 if (!IS_ERR(ib_conn->fmr.pool))
244 /* no FMR => no need for page_vec */
245 kfree(ib_conn->fmr.page_vec);
246 ib_conn->fmr.page_vec = NULL;
248 ret = PTR_ERR(ib_conn->fmr.pool);
249 ib_conn->fmr.pool = NULL;
250 if (ret != -ENOSYS) {
251 iser_err("FMR allocation failed, err %d\n", ret);
254 iser_warn("FMRs are not supported, using unaligned mode\n");
260 * iser_free_fmr_pool - releases the FMR pool and page vec
262 void iser_free_fmr_pool(struct ib_conn *ib_conn)
264 iser_info("freeing conn %p fmr pool %p\n",
265 ib_conn, ib_conn->fmr.pool);
267 if (ib_conn->fmr.pool != NULL)
268 ib_destroy_fmr_pool(ib_conn->fmr.pool);
270 ib_conn->fmr.pool = NULL;
272 kfree(ib_conn->fmr.page_vec);
273 ib_conn->fmr.page_vec = NULL;
277 iser_alloc_pi_ctx(struct ib_device *ib_device, struct ib_pd *pd,
278 struct fast_reg_descriptor *desc)
280 struct iser_pi_context *pi_ctx = NULL;
281 struct ib_mr_init_attr mr_init_attr = {.max_reg_descriptors = 2,
282 .flags = IB_MR_SIGNATURE_EN};
285 desc->pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
289 pi_ctx = desc->pi_ctx;
291 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
292 ISCSI_ISER_SG_TABLESIZE);
293 if (IS_ERR(pi_ctx->prot_frpl)) {
294 ret = PTR_ERR(pi_ctx->prot_frpl);
295 goto prot_frpl_failure;
298 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd,
299 ISCSI_ISER_SG_TABLESIZE + 1);
300 if (IS_ERR(pi_ctx->prot_mr)) {
301 ret = PTR_ERR(pi_ctx->prot_mr);
302 goto prot_mr_failure;
304 desc->reg_indicators |= ISER_PROT_KEY_VALID;
306 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
307 if (IS_ERR(pi_ctx->sig_mr)) {
308 ret = PTR_ERR(pi_ctx->sig_mr);
311 desc->reg_indicators |= ISER_SIG_KEY_VALID;
312 desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
317 ib_dereg_mr(desc->pi_ctx->prot_mr);
319 ib_free_fast_reg_page_list(desc->pi_ctx->prot_frpl);
327 iser_free_pi_ctx(struct iser_pi_context *pi_ctx)
329 ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
330 ib_dereg_mr(pi_ctx->prot_mr);
331 ib_destroy_mr(pi_ctx->sig_mr);
336 iser_create_fastreg_desc(struct ib_device *ib_device, struct ib_pd *pd,
337 bool pi_enable, struct fast_reg_descriptor *desc)
341 desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
342 ISCSI_ISER_SG_TABLESIZE + 1);
343 if (IS_ERR(desc->data_frpl)) {
344 ret = PTR_ERR(desc->data_frpl);
345 iser_err("Failed to allocate ib_fast_reg_page_list err=%d\n",
347 return PTR_ERR(desc->data_frpl);
350 desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE + 1);
351 if (IS_ERR(desc->data_mr)) {
352 ret = PTR_ERR(desc->data_mr);
353 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
354 goto fast_reg_mr_failure;
356 desc->reg_indicators |= ISER_DATA_KEY_VALID;
359 ret = iser_alloc_pi_ctx(ib_device, pd, desc);
361 goto pi_ctx_alloc_failure;
365 pi_ctx_alloc_failure:
366 ib_dereg_mr(desc->data_mr);
368 ib_free_fast_reg_page_list(desc->data_frpl);
374 * iser_create_fastreg_pool - Creates pool of fast_reg descriptors
375 * for fast registration work requests.
376 * returns 0 on success, or errno code on failure
378 int iser_create_fastreg_pool(struct ib_conn *ib_conn, unsigned cmds_max)
380 struct iser_device *device = ib_conn->device;
381 struct fast_reg_descriptor *desc;
384 INIT_LIST_HEAD(&ib_conn->fastreg.pool);
385 ib_conn->fastreg.pool_size = 0;
386 for (i = 0; i < cmds_max; i++) {
387 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
389 iser_err("Failed to allocate a new fast_reg descriptor\n");
394 ret = iser_create_fastreg_desc(device->ib_device, device->pd,
395 ib_conn->pi_support, desc);
397 iser_err("Failed to create fastreg descriptor err=%d\n",
403 list_add_tail(&desc->list, &ib_conn->fastreg.pool);
404 ib_conn->fastreg.pool_size++;
410 iser_free_fastreg_pool(ib_conn);
415 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
417 void iser_free_fastreg_pool(struct ib_conn *ib_conn)
419 struct fast_reg_descriptor *desc, *tmp;
422 if (list_empty(&ib_conn->fastreg.pool))
425 iser_info("freeing conn %p fr pool\n", ib_conn);
427 list_for_each_entry_safe(desc, tmp, &ib_conn->fastreg.pool, list) {
428 list_del(&desc->list);
429 ib_free_fast_reg_page_list(desc->data_frpl);
430 ib_dereg_mr(desc->data_mr);
432 iser_free_pi_ctx(desc->pi_ctx);
437 if (i < ib_conn->fastreg.pool_size)
438 iser_warn("pool still has %d regions registered\n",
439 ib_conn->fastreg.pool_size - i);
443 * iser_create_ib_conn_res - Queue-Pair (QP)
445 * returns 0 on success, -1 on failure
447 static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
449 struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
451 struct iser_device *device;
452 struct ib_device_attr *dev_attr;
453 struct ib_qp_init_attr init_attr;
455 int index, min_index = 0;
457 BUG_ON(ib_conn->device == NULL);
459 device = ib_conn->device;
460 dev_attr = &device->dev_attr;
462 memset(&init_attr, 0, sizeof init_attr);
464 mutex_lock(&ig.connlist_mutex);
465 /* select the CQ with the minimal number of usages */
466 for (index = 0; index < device->comps_used; index++) {
467 if (device->comps[index].active_qps <
468 device->comps[min_index].active_qps)
471 ib_conn->comp = &device->comps[min_index];
472 ib_conn->comp->active_qps++;
473 mutex_unlock(&ig.connlist_mutex);
474 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn);
476 init_attr.event_handler = iser_qp_event_callback;
477 init_attr.qp_context = (void *)ib_conn;
478 init_attr.send_cq = ib_conn->comp->cq;
479 init_attr.recv_cq = ib_conn->comp->cq;
480 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
481 init_attr.cap.max_send_sge = 2;
482 init_attr.cap.max_recv_sge = 1;
483 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
484 init_attr.qp_type = IB_QPT_RC;
485 if (ib_conn->pi_support) {
486 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
487 init_attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
488 iser_conn->max_cmds =
489 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS);
491 if (dev_attr->max_qp_wr > ISER_QP_MAX_REQ_DTOS) {
492 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
493 iser_conn->max_cmds =
494 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS);
496 init_attr.cap.max_send_wr = dev_attr->max_qp_wr;
497 iser_conn->max_cmds =
498 ISER_GET_MAX_XMIT_CMDS(dev_attr->max_qp_wr);
499 iser_dbg("device %s supports max_send_wr %d\n",
500 device->ib_device->name, dev_attr->max_qp_wr);
504 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
508 ib_conn->qp = ib_conn->cma_id->qp;
509 iser_info("setting conn %p cma_id %p qp %p\n",
510 ib_conn, ib_conn->cma_id,
511 ib_conn->cma_id->qp);
515 mutex_lock(&ig.connlist_mutex);
516 ib_conn->comp->active_qps--;
517 mutex_unlock(&ig.connlist_mutex);
518 iser_err("unable to alloc mem or create resource, err %d\n", ret);
524 * based on the resolved device node GUID see if there already allocated
525 * device for this device. If there's no such, create one.
528 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
530 struct iser_device *device;
532 mutex_lock(&ig.device_list_mutex);
534 list_for_each_entry(device, &ig.device_list, ig_list)
535 /* find if there's a match using the node GUID */
536 if (device->ib_device->node_guid == cma_id->device->node_guid)
539 device = kzalloc(sizeof *device, GFP_KERNEL);
543 /* assign this device to the device */
544 device->ib_device = cma_id->device;
545 /* init the device and link it into ig device list */
546 if (iser_create_device_ib_res(device)) {
551 list_add(&device->ig_list, &ig.device_list);
556 mutex_unlock(&ig.device_list_mutex);
560 /* if there's no demand for this device, release it */
561 static void iser_device_try_release(struct iser_device *device)
563 mutex_lock(&ig.device_list_mutex);
565 iser_info("device %p refcount %d\n", device, device->refcount);
566 if (!device->refcount) {
567 iser_free_device_ib_res(device);
568 list_del(&device->ig_list);
571 mutex_unlock(&ig.device_list_mutex);
575 * Called with state mutex held
577 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn,
578 enum iser_conn_state comp,
579 enum iser_conn_state exch)
583 ret = (iser_conn->state == comp);
585 iser_conn->state = exch;
590 void iser_release_work(struct work_struct *work)
592 struct iser_conn *iser_conn;
594 iser_conn = container_of(work, struct iser_conn, release_work);
596 /* Wait for conn_stop to complete */
597 wait_for_completion(&iser_conn->stop_completion);
598 /* Wait for IB resouces cleanup to complete */
599 wait_for_completion(&iser_conn->ib_completion);
601 mutex_lock(&iser_conn->state_mutex);
602 iser_conn->state = ISER_CONN_DOWN;
603 mutex_unlock(&iser_conn->state_mutex);
605 iser_conn_release(iser_conn);
609 * iser_free_ib_conn_res - release IB related resources
610 * @iser_conn: iser connection struct
611 * @destroy: indicator if we need to try to release the
612 * iser device and memory regoins pool (only iscsi
613 * shutdown and DEVICE_REMOVAL will use this).
615 * This routine is called with the iser state mutex held
616 * so the cm_id removal is out of here. It is Safe to
617 * be invoked multiple times.
619 static void iser_free_ib_conn_res(struct iser_conn *iser_conn,
622 struct ib_conn *ib_conn = &iser_conn->ib_conn;
623 struct iser_device *device = ib_conn->device;
625 iser_info("freeing conn %p cma_id %p qp %p\n",
626 iser_conn, ib_conn->cma_id, ib_conn->qp);
628 if (ib_conn->qp != NULL) {
629 ib_conn->comp->active_qps--;
630 rdma_destroy_qp(ib_conn->cma_id);
635 if (iser_conn->rx_descs)
636 iser_free_rx_descriptors(iser_conn);
638 if (device != NULL) {
639 iser_device_try_release(device);
640 ib_conn->device = NULL;
646 * Frees all conn objects and deallocs conn descriptor
648 void iser_conn_release(struct iser_conn *iser_conn)
650 struct ib_conn *ib_conn = &iser_conn->ib_conn;
652 mutex_lock(&ig.connlist_mutex);
653 list_del(&iser_conn->conn_list);
654 mutex_unlock(&ig.connlist_mutex);
656 mutex_lock(&iser_conn->state_mutex);
657 /* In case we endup here without ep_disconnect being invoked. */
658 if (iser_conn->state != ISER_CONN_DOWN) {
659 iser_warn("iser conn %p state %d, expected state down.\n",
660 iser_conn, iser_conn->state);
661 iscsi_destroy_endpoint(iser_conn->ep);
662 iser_conn->state = ISER_CONN_DOWN;
665 * In case we never got to bind stage, we still need to
666 * release IB resources (which is safe to call more than once).
668 iser_free_ib_conn_res(iser_conn, true);
669 mutex_unlock(&iser_conn->state_mutex);
671 if (ib_conn->cma_id != NULL) {
672 rdma_destroy_id(ib_conn->cma_id);
673 ib_conn->cma_id = NULL;
680 * triggers start of the disconnect procedures and wait for them to be done
681 * Called with state mutex held
683 int iser_conn_terminate(struct iser_conn *iser_conn)
685 struct ib_conn *ib_conn = &iser_conn->ib_conn;
686 struct ib_send_wr *bad_wr;
689 /* terminate the iser conn only if the conn state is UP */
690 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP,
691 ISER_CONN_TERMINATING))
694 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
696 /* suspend queuing of new iscsi commands */
697 if (iser_conn->iscsi_conn)
698 iscsi_suspend_queue(iser_conn->iscsi_conn);
701 * In case we didn't already clean up the cma_id (peer initiated
702 * a disconnection), we need to Cause the CMA to change the QP
705 if (ib_conn->cma_id) {
706 err = rdma_disconnect(ib_conn->cma_id);
708 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
711 /* post an indication that all flush errors were consumed */
712 err = ib_post_send(ib_conn->qp, &ib_conn->beacon, &bad_wr);
714 iser_err("conn %p failed to post beacon", ib_conn);
718 wait_for_completion(&ib_conn->flush_comp);
725 * Called with state mutex held
727 static void iser_connect_error(struct rdma_cm_id *cma_id)
729 struct iser_conn *iser_conn;
731 iser_conn = (struct iser_conn *)cma_id->context;
732 iser_conn->state = ISER_CONN_TERMINATING;
736 * Called with state mutex held
738 static void iser_addr_handler(struct rdma_cm_id *cma_id)
740 struct iser_device *device;
741 struct iser_conn *iser_conn;
742 struct ib_conn *ib_conn;
745 iser_conn = (struct iser_conn *)cma_id->context;
746 if (iser_conn->state != ISER_CONN_PENDING)
750 ib_conn = &iser_conn->ib_conn;
751 device = iser_device_find_by_ib_device(cma_id);
753 iser_err("device lookup/creation failed\n");
754 iser_connect_error(cma_id);
758 ib_conn->device = device;
760 /* connection T10-PI support */
761 if (iser_pi_enable) {
762 if (!(device->dev_attr.device_cap_flags &
763 IB_DEVICE_SIGNATURE_HANDOVER)) {
764 iser_warn("T10-PI requested but not supported on %s, "
765 "continue without T10-PI\n",
766 ib_conn->device->ib_device->name);
767 ib_conn->pi_support = false;
769 ib_conn->pi_support = true;
773 ret = rdma_resolve_route(cma_id, 1000);
775 iser_err("resolve route failed: %d\n", ret);
776 iser_connect_error(cma_id);
782 * Called with state mutex held
784 static void iser_route_handler(struct rdma_cm_id *cma_id)
786 struct rdma_conn_param conn_param;
788 struct iser_cm_hdr req_hdr;
789 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
790 struct ib_conn *ib_conn = &iser_conn->ib_conn;
791 struct iser_device *device = ib_conn->device;
793 if (iser_conn->state != ISER_CONN_PENDING)
797 ret = iser_create_ib_conn_res(ib_conn);
801 memset(&conn_param, 0, sizeof conn_param);
802 conn_param.responder_resources = device->dev_attr.max_qp_rd_atom;
803 conn_param.initiator_depth = 1;
804 conn_param.retry_count = 7;
805 conn_param.rnr_retry_count = 6;
807 memset(&req_hdr, 0, sizeof(req_hdr));
808 req_hdr.flags = (ISER_ZBVA_NOT_SUPPORTED |
809 ISER_SEND_W_INV_NOT_SUPPORTED);
810 conn_param.private_data = (void *)&req_hdr;
811 conn_param.private_data_len = sizeof(struct iser_cm_hdr);
813 ret = rdma_connect(cma_id, &conn_param);
815 iser_err("failure connecting: %d\n", ret);
821 iser_connect_error(cma_id);
824 static void iser_connected_handler(struct rdma_cm_id *cma_id)
826 struct iser_conn *iser_conn;
827 struct ib_qp_attr attr;
828 struct ib_qp_init_attr init_attr;
830 iser_conn = (struct iser_conn *)cma_id->context;
831 if (iser_conn->state != ISER_CONN_PENDING)
835 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
836 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
838 iser_conn->state = ISER_CONN_UP;
839 complete(&iser_conn->up_completion);
842 static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
844 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
846 if (iser_conn_terminate(iser_conn)) {
847 if (iser_conn->iscsi_conn)
848 iscsi_conn_failure(iser_conn->iscsi_conn,
849 ISCSI_ERR_CONN_FAILED);
851 iser_err("iscsi_iser connection isn't bound\n");
855 static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
858 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
861 * We are not guaranteed that we visited disconnected_handler
862 * by now, call it here to be safe that we handle CM drep
865 iser_disconnected_handler(cma_id);
866 iser_free_ib_conn_res(iser_conn, destroy);
867 complete(&iser_conn->ib_completion);
870 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
872 struct iser_conn *iser_conn;
875 iser_conn = (struct iser_conn *)cma_id->context;
876 iser_info("event %d status %d conn %p id %p\n",
877 event->event, event->status, cma_id->context, cma_id);
879 mutex_lock(&iser_conn->state_mutex);
880 switch (event->event) {
881 case RDMA_CM_EVENT_ADDR_RESOLVED:
882 iser_addr_handler(cma_id);
884 case RDMA_CM_EVENT_ROUTE_RESOLVED:
885 iser_route_handler(cma_id);
887 case RDMA_CM_EVENT_ESTABLISHED:
888 iser_connected_handler(cma_id);
890 case RDMA_CM_EVENT_ADDR_ERROR:
891 case RDMA_CM_EVENT_ROUTE_ERROR:
892 case RDMA_CM_EVENT_CONNECT_ERROR:
893 case RDMA_CM_EVENT_UNREACHABLE:
894 case RDMA_CM_EVENT_REJECTED:
895 iser_connect_error(cma_id);
897 case RDMA_CM_EVENT_DISCONNECTED:
898 case RDMA_CM_EVENT_ADDR_CHANGE:
899 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
900 iser_cleanup_handler(cma_id, false);
902 case RDMA_CM_EVENT_DEVICE_REMOVAL:
904 * we *must* destroy the device as we cannot rely
905 * on iscsid to be around to initiate error handling.
906 * also if we are not in state DOWN implicitly destroy
909 iser_cleanup_handler(cma_id, true);
910 if (iser_conn->state != ISER_CONN_DOWN) {
911 iser_conn->ib_conn.cma_id = NULL;
916 iser_err("Unexpected RDMA CM event (%d)\n", event->event);
919 mutex_unlock(&iser_conn->state_mutex);
924 void iser_conn_init(struct iser_conn *iser_conn)
926 iser_conn->state = ISER_CONN_INIT;
927 iser_conn->ib_conn.post_recv_buf_count = 0;
928 init_completion(&iser_conn->ib_conn.flush_comp);
929 init_completion(&iser_conn->stop_completion);
930 init_completion(&iser_conn->ib_completion);
931 init_completion(&iser_conn->up_completion);
932 INIT_LIST_HEAD(&iser_conn->conn_list);
933 spin_lock_init(&iser_conn->ib_conn.lock);
934 mutex_init(&iser_conn->state_mutex);
938 * starts the process of connecting to the target
939 * sleeps until the connection is established or rejected
941 int iser_connect(struct iser_conn *iser_conn,
942 struct sockaddr *src_addr,
943 struct sockaddr *dst_addr,
946 struct ib_conn *ib_conn = &iser_conn->ib_conn;
949 mutex_lock(&iser_conn->state_mutex);
951 sprintf(iser_conn->name, "%pISp", dst_addr);
953 iser_info("connecting to: %s\n", iser_conn->name);
955 /* the device is known only --after-- address resolution */
956 ib_conn->device = NULL;
958 iser_conn->state = ISER_CONN_PENDING;
960 ib_conn->beacon.wr_id = ISER_BEACON_WRID;
961 ib_conn->beacon.opcode = IB_WR_SEND;
963 ib_conn->cma_id = rdma_create_id(iser_cma_handler,
965 RDMA_PS_TCP, IB_QPT_RC);
966 if (IS_ERR(ib_conn->cma_id)) {
967 err = PTR_ERR(ib_conn->cma_id);
968 iser_err("rdma_create_id failed: %d\n", err);
972 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
974 iser_err("rdma_resolve_addr failed: %d\n", err);
979 wait_for_completion_interruptible(&iser_conn->up_completion);
981 if (iser_conn->state != ISER_CONN_UP) {
983 goto connect_failure;
986 mutex_unlock(&iser_conn->state_mutex);
988 mutex_lock(&ig.connlist_mutex);
989 list_add(&iser_conn->conn_list, &ig.connlist);
990 mutex_unlock(&ig.connlist_mutex);
994 ib_conn->cma_id = NULL;
996 iser_conn->state = ISER_CONN_DOWN;
998 mutex_unlock(&iser_conn->state_mutex);
999 iser_conn_release(iser_conn);
1003 int iser_post_recvl(struct iser_conn *iser_conn)
1005 struct ib_recv_wr rx_wr, *rx_wr_failed;
1006 struct ib_conn *ib_conn = &iser_conn->ib_conn;
1010 sge.addr = iser_conn->login_resp_dma;
1011 sge.length = ISER_RX_LOGIN_SIZE;
1012 sge.lkey = ib_conn->device->mr->lkey;
1014 rx_wr.wr_id = (uintptr_t)iser_conn->login_resp_buf;
1015 rx_wr.sg_list = &sge;
1019 ib_conn->post_recv_buf_count++;
1020 ib_ret = ib_post_recv(ib_conn->qp, &rx_wr, &rx_wr_failed);
1022 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
1023 ib_conn->post_recv_buf_count--;
1028 int iser_post_recvm(struct iser_conn *iser_conn, int count)
1030 struct ib_recv_wr *rx_wr, *rx_wr_failed;
1032 struct ib_conn *ib_conn = &iser_conn->ib_conn;
1033 unsigned int my_rx_head = iser_conn->rx_desc_head;
1034 struct iser_rx_desc *rx_desc;
1036 for (rx_wr = ib_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1037 rx_desc = &iser_conn->rx_descs[my_rx_head];
1038 rx_wr->wr_id = (uintptr_t)rx_desc;
1039 rx_wr->sg_list = &rx_desc->rx_sg;
1041 rx_wr->next = rx_wr + 1;
1042 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask;
1046 rx_wr->next = NULL; /* mark end of work requests list */
1048 ib_conn->post_recv_buf_count += count;
1049 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, &rx_wr_failed);
1051 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
1052 ib_conn->post_recv_buf_count -= count;
1054 iser_conn->rx_desc_head = my_rx_head;
1060 * iser_start_send - Initiate a Send DTO operation
1062 * returns 0 on success, -1 on failure
1064 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
1068 struct ib_send_wr send_wr, *send_wr_failed;
1070 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
1071 tx_desc->dma_addr, ISER_HEADERS_LEN,
1074 send_wr.next = NULL;
1075 send_wr.wr_id = (uintptr_t)tx_desc;
1076 send_wr.sg_list = tx_desc->tx_sg;
1077 send_wr.num_sge = tx_desc->num_sge;
1078 send_wr.opcode = IB_WR_SEND;
1079 send_wr.send_flags = signal ? IB_SEND_SIGNALED : 0;
1081 ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
1083 iser_err("ib_post_send failed, ret:%d\n", ib_ret);
1089 * is_iser_tx_desc - Indicate if the completion wr_id
1090 * is a TX descriptor or not.
1091 * @iser_conn: iser connection
1092 * @wr_id: completion WR identifier
1094 * Since we cannot rely on wc opcode in FLUSH errors
1095 * we must work around it by checking if the wr_id address
1096 * falls in the iser connection rx_descs buffer. If so
1097 * it is an RX descriptor, otherwize it is a TX.
1100 is_iser_tx_desc(struct iser_conn *iser_conn, void *wr_id)
1102 void *start = iser_conn->rx_descs;
1103 int len = iser_conn->num_rx_descs * sizeof(*iser_conn->rx_descs);
1105 if (wr_id >= start && wr_id < start + len)
1112 * iser_handle_comp_error() - Handle error completion
1113 * @ib_conn: connection RDMA resources
1114 * @wc: work completion
1116 * Notes: We may handle a FLUSH error completion and in this case
1117 * we only cleanup in case TX type was DATAOUT. For non-FLUSH
1118 * error completion we should also notify iscsi layer that
1119 * connection is failed (in case we passed bind stage).
1122 iser_handle_comp_error(struct ib_conn *ib_conn,
1125 void *wr_id = (void *)(uintptr_t)wc->wr_id;
1126 struct iser_conn *iser_conn = container_of(ib_conn, struct iser_conn,
1129 if (wc->status != IB_WC_WR_FLUSH_ERR)
1130 if (iser_conn->iscsi_conn)
1131 iscsi_conn_failure(iser_conn->iscsi_conn,
1132 ISCSI_ERR_CONN_FAILED);
1134 if (wc->wr_id == ISER_FASTREG_LI_WRID)
1137 if (is_iser_tx_desc(iser_conn, wr_id)) {
1138 struct iser_tx_desc *desc = wr_id;
1140 if (desc->type == ISCSI_TX_DATAOUT)
1141 kmem_cache_free(ig.desc_cache, desc);
1143 ib_conn->post_recv_buf_count--;
1148 * iser_handle_wc - handle a single work completion
1149 * @wc: work completion
1151 * Soft-IRQ context, work completion can be either
1152 * SEND or RECV, and can turn out successful or
1153 * with error (or flush error).
1155 static void iser_handle_wc(struct ib_wc *wc)
1157 struct ib_conn *ib_conn;
1158 struct iser_tx_desc *tx_desc;
1159 struct iser_rx_desc *rx_desc;
1161 ib_conn = wc->qp->qp_context;
1162 if (likely(wc->status == IB_WC_SUCCESS)) {
1163 if (wc->opcode == IB_WC_RECV) {
1164 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
1165 iser_rcv_completion(rx_desc, wc->byte_len,
1168 if (wc->opcode == IB_WC_SEND) {
1169 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
1170 iser_snd_completion(tx_desc, ib_conn);
1172 iser_err("Unknown wc opcode %d\n", wc->opcode);
1175 if (wc->status != IB_WC_WR_FLUSH_ERR)
1176 iser_err("wr id %llx status %d vend_err %x\n",
1177 wc->wr_id, wc->status, wc->vendor_err);
1179 iser_dbg("flush error: wr id %llx\n", wc->wr_id);
1181 if (wc->wr_id == ISER_BEACON_WRID)
1182 /* all flush errors were consumed */
1183 complete(&ib_conn->flush_comp);
1185 iser_handle_comp_error(ib_conn, wc);
1190 * iser_cq_tasklet_fn - iSER completion polling loop
1191 * @data: iSER completion context
1193 * Soft-IRQ context, polling connection CQ until
1194 * either CQ was empty or we exausted polling budget
1196 static void iser_cq_tasklet_fn(unsigned long data)
1198 struct iser_comp *comp = (struct iser_comp *)data;
1199 struct ib_cq *cq = comp->cq;
1200 struct ib_wc *const wcs = comp->wcs;
1201 int i, n, completed = 0;
1203 while ((n = ib_poll_cq(cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
1204 for (i = 0; i < n; i++)
1205 iser_handle_wc(&wcs[i]);
1208 if (completed >= iser_cq_poll_limit)
1213 * It is assumed here that arming CQ only once its empty
1214 * would not cause interrupts to be missed.
1216 ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
1218 iser_dbg("got %d completions\n", completed);
1221 static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
1223 struct iser_comp *comp = cq_context;
1225 tasklet_schedule(&comp->tasklet);
1228 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
1229 enum iser_data_dir cmd_dir, sector_t *sector)
1231 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
1232 struct fast_reg_descriptor *desc = reg->mem_h;
1233 unsigned long sector_size = iser_task->sc->device->sector_size;
1234 struct ib_mr_status mr_status;
1237 if (desc && desc->reg_indicators & ISER_FASTREG_PROTECTED) {
1238 desc->reg_indicators &= ~ISER_FASTREG_PROTECTED;
1239 ret = ib_check_mr_status(desc->pi_ctx->sig_mr,
1240 IB_MR_CHECK_SIG_STATUS, &mr_status);
1242 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1246 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1247 sector_t sector_off = mr_status.sig_err.sig_err_offset;
1249 do_div(sector_off, sector_size + 8);
1250 *sector = scsi_get_lba(iser_task->sc) + sector_off;
1252 pr_err("PI error found type %d at sector %llx "
1253 "expected %x vs actual %x\n",
1254 mr_status.sig_err.err_type,
1255 (unsigned long long)*sector,
1256 mr_status.sig_err.expected,
1257 mr_status.sig_err.actual);
1259 switch (mr_status.sig_err.err_type) {
1260 case IB_SIG_BAD_GUARD:
1262 case IB_SIG_BAD_REFTAG:
1264 case IB_SIG_BAD_APPTAG:
1272 /* Not alot we can do here, return ambiguous guard error */