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 dev_name(&event->device->dev), 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, dev_name(&ib_dev->dev),
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);
236 static struct iser_fr_desc *
237 iser_create_fastreg_desc(struct iser_device *device,
242 struct iser_fr_desc *desc;
243 struct ib_device *ib_dev = device->ib_device;
244 enum ib_mr_type mr_type;
247 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
249 return ERR_PTR(-ENOMEM);
251 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_SG_GAPS_REG)
252 mr_type = IB_MR_TYPE_SG_GAPS;
254 mr_type = IB_MR_TYPE_MEM_REG;
256 desc->rsc.mr = ib_alloc_mr(pd, mr_type, size);
257 if (IS_ERR(desc->rsc.mr)) {
258 ret = PTR_ERR(desc->rsc.mr);
259 iser_err("Failed to allocate ib_fast_reg_mr err=%d\n", ret);
264 desc->rsc.sig_mr = ib_alloc_mr_integrity(pd, size, size);
265 if (IS_ERR(desc->rsc.sig_mr)) {
266 ret = PTR_ERR(desc->rsc.sig_mr);
267 iser_err("Failed to allocate sig_mr err=%d\n", ret);
268 goto err_alloc_mr_integrity;
271 desc->rsc.mr_valid = 0;
275 err_alloc_mr_integrity:
276 ib_dereg_mr(desc->rsc.mr);
283 static void iser_destroy_fastreg_desc(struct iser_fr_desc *desc)
285 struct iser_reg_resources *res = &desc->rsc;
287 ib_dereg_mr(res->mr);
289 ib_dereg_mr(res->sig_mr);
296 * iser_alloc_fastreg_pool - Creates pool of fast_reg descriptors
297 * for fast registration work requests.
298 * returns 0 on success, or errno code on failure
300 int iser_alloc_fastreg_pool(struct ib_conn *ib_conn,
304 struct iser_device *device = ib_conn->device;
305 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
306 struct iser_fr_desc *desc;
309 INIT_LIST_HEAD(&fr_pool->list);
310 INIT_LIST_HEAD(&fr_pool->all_list);
311 spin_lock_init(&fr_pool->lock);
313 for (i = 0; i < cmds_max; i++) {
314 desc = iser_create_fastreg_desc(device, device->pd,
315 ib_conn->pi_support, size);
321 list_add_tail(&desc->list, &fr_pool->list);
322 list_add_tail(&desc->all_list, &fr_pool->all_list);
329 iser_free_fastreg_pool(ib_conn);
334 * iser_free_fastreg_pool - releases the pool of fast_reg descriptors
336 void iser_free_fastreg_pool(struct ib_conn *ib_conn)
338 struct iser_fr_pool *fr_pool = &ib_conn->fr_pool;
339 struct iser_fr_desc *desc, *tmp;
342 if (list_empty(&fr_pool->all_list))
345 iser_info("freeing conn %p fr pool\n", ib_conn);
347 list_for_each_entry_safe(desc, tmp, &fr_pool->all_list, all_list) {
348 list_del(&desc->all_list);
349 iser_destroy_fastreg_desc(desc);
353 if (i < fr_pool->size)
354 iser_warn("pool still has %d regions registered\n",
359 * iser_create_ib_conn_res - Queue-Pair (QP)
361 * returns 0 on success, -1 on failure
363 static int iser_create_ib_conn_res(struct ib_conn *ib_conn)
365 struct iser_conn *iser_conn = to_iser_conn(ib_conn);
366 struct iser_device *device;
367 struct ib_device *ib_dev;
368 struct ib_qp_init_attr init_attr;
370 int index, min_index = 0;
372 BUG_ON(ib_conn->device == NULL);
374 device = ib_conn->device;
375 ib_dev = device->ib_device;
377 memset(&init_attr, 0, sizeof init_attr);
379 mutex_lock(&ig.connlist_mutex);
380 /* select the CQ with the minimal number of usages */
381 for (index = 0; index < device->comps_used; index++) {
382 if (device->comps[index].active_qps <
383 device->comps[min_index].active_qps)
386 ib_conn->comp = &device->comps[min_index];
387 ib_conn->comp->active_qps++;
388 mutex_unlock(&ig.connlist_mutex);
389 iser_info("cq index %d used for ib_conn %p\n", min_index, ib_conn);
391 init_attr.event_handler = iser_qp_event_callback;
392 init_attr.qp_context = (void *)ib_conn;
393 init_attr.send_cq = ib_conn->comp->cq;
394 init_attr.recv_cq = ib_conn->comp->cq;
395 init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
396 init_attr.cap.max_send_sge = 2;
397 init_attr.cap.max_recv_sge = 1;
398 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
399 init_attr.qp_type = IB_QPT_RC;
400 if (ib_conn->pi_support) {
401 init_attr.cap.max_send_wr = ISER_QP_SIG_MAX_REQ_DTOS + 1;
402 init_attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
403 iser_conn->max_cmds =
404 ISER_GET_MAX_XMIT_CMDS(ISER_QP_SIG_MAX_REQ_DTOS);
406 if (ib_dev->attrs.max_qp_wr > ISER_QP_MAX_REQ_DTOS) {
407 init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS + 1;
408 iser_conn->max_cmds =
409 ISER_GET_MAX_XMIT_CMDS(ISER_QP_MAX_REQ_DTOS);
411 init_attr.cap.max_send_wr = ib_dev->attrs.max_qp_wr;
412 iser_conn->max_cmds =
413 ISER_GET_MAX_XMIT_CMDS(ib_dev->attrs.max_qp_wr);
414 iser_dbg("device %s supports max_send_wr %d\n",
415 dev_name(&device->ib_device->dev),
416 ib_dev->attrs.max_qp_wr);
420 ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
424 ib_conn->qp = ib_conn->cma_id->qp;
425 iser_info("setting conn %p cma_id %p qp %p\n",
426 ib_conn, ib_conn->cma_id,
427 ib_conn->cma_id->qp);
431 mutex_lock(&ig.connlist_mutex);
432 ib_conn->comp->active_qps--;
433 mutex_unlock(&ig.connlist_mutex);
434 iser_err("unable to alloc mem or create resource, err %d\n", ret);
440 * based on the resolved device node GUID see if there already allocated
441 * device for this device. If there's no such, create one.
444 struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
446 struct iser_device *device;
448 mutex_lock(&ig.device_list_mutex);
450 list_for_each_entry(device, &ig.device_list, ig_list)
451 /* find if there's a match using the node GUID */
452 if (device->ib_device->node_guid == cma_id->device->node_guid)
455 device = kzalloc(sizeof *device, GFP_KERNEL);
459 /* assign this device to the device */
460 device->ib_device = cma_id->device;
461 /* init the device and link it into ig device list */
462 if (iser_create_device_ib_res(device)) {
467 list_add(&device->ig_list, &ig.device_list);
472 mutex_unlock(&ig.device_list_mutex);
476 /* if there's no demand for this device, release it */
477 static void iser_device_try_release(struct iser_device *device)
479 mutex_lock(&ig.device_list_mutex);
481 iser_info("device %p refcount %d\n", device, device->refcount);
482 if (!device->refcount) {
483 iser_free_device_ib_res(device);
484 list_del(&device->ig_list);
487 mutex_unlock(&ig.device_list_mutex);
491 * Called with state mutex held
493 static int iser_conn_state_comp_exch(struct iser_conn *iser_conn,
494 enum iser_conn_state comp,
495 enum iser_conn_state exch)
499 ret = (iser_conn->state == comp);
501 iser_conn->state = exch;
506 void iser_release_work(struct work_struct *work)
508 struct iser_conn *iser_conn;
510 iser_conn = container_of(work, struct iser_conn, release_work);
512 /* Wait for conn_stop to complete */
513 wait_for_completion(&iser_conn->stop_completion);
514 /* Wait for IB resouces cleanup to complete */
515 wait_for_completion(&iser_conn->ib_completion);
517 mutex_lock(&iser_conn->state_mutex);
518 iser_conn->state = ISER_CONN_DOWN;
519 mutex_unlock(&iser_conn->state_mutex);
521 iser_conn_release(iser_conn);
525 * iser_free_ib_conn_res - release IB related resources
526 * @iser_conn: iser connection struct
527 * @destroy: indicator if we need to try to release the
528 * iser device and memory regoins pool (only iscsi
529 * shutdown and DEVICE_REMOVAL will use this).
531 * This routine is called with the iser state mutex held
532 * so the cm_id removal is out of here. It is Safe to
533 * be invoked multiple times.
535 static void iser_free_ib_conn_res(struct iser_conn *iser_conn,
538 struct ib_conn *ib_conn = &iser_conn->ib_conn;
539 struct iser_device *device = ib_conn->device;
541 iser_info("freeing conn %p cma_id %p qp %p\n",
542 iser_conn, ib_conn->cma_id, ib_conn->qp);
544 if (ib_conn->qp != NULL) {
545 mutex_lock(&ig.connlist_mutex);
546 ib_conn->comp->active_qps--;
547 mutex_unlock(&ig.connlist_mutex);
548 rdma_destroy_qp(ib_conn->cma_id);
553 if (iser_conn->rx_descs)
554 iser_free_rx_descriptors(iser_conn);
556 if (device != NULL) {
557 iser_device_try_release(device);
558 ib_conn->device = NULL;
564 * Frees all conn objects and deallocs conn descriptor
566 void iser_conn_release(struct iser_conn *iser_conn)
568 struct ib_conn *ib_conn = &iser_conn->ib_conn;
570 mutex_lock(&ig.connlist_mutex);
571 list_del(&iser_conn->conn_list);
572 mutex_unlock(&ig.connlist_mutex);
574 mutex_lock(&iser_conn->state_mutex);
575 /* In case we endup here without ep_disconnect being invoked. */
576 if (iser_conn->state != ISER_CONN_DOWN) {
577 iser_warn("iser conn %p state %d, expected state down.\n",
578 iser_conn, iser_conn->state);
579 iscsi_destroy_endpoint(iser_conn->ep);
580 iser_conn->state = ISER_CONN_DOWN;
583 * In case we never got to bind stage, we still need to
584 * release IB resources (which is safe to call more than once).
586 iser_free_ib_conn_res(iser_conn, true);
587 mutex_unlock(&iser_conn->state_mutex);
589 if (ib_conn->cma_id != NULL) {
590 rdma_destroy_id(ib_conn->cma_id);
591 ib_conn->cma_id = NULL;
598 * triggers start of the disconnect procedures and wait for them to be done
599 * Called with state mutex held
601 int iser_conn_terminate(struct iser_conn *iser_conn)
603 struct ib_conn *ib_conn = &iser_conn->ib_conn;
606 /* terminate the iser conn only if the conn state is UP */
607 if (!iser_conn_state_comp_exch(iser_conn, ISER_CONN_UP,
608 ISER_CONN_TERMINATING))
611 iser_info("iser_conn %p state %d\n", iser_conn, iser_conn->state);
613 /* suspend queuing of new iscsi commands */
614 if (iser_conn->iscsi_conn)
615 iscsi_suspend_queue(iser_conn->iscsi_conn);
618 * In case we didn't already clean up the cma_id (peer initiated
619 * a disconnection), we need to Cause the CMA to change the QP
622 if (ib_conn->cma_id) {
623 err = rdma_disconnect(ib_conn->cma_id);
625 iser_err("Failed to disconnect, conn: 0x%p err %d\n",
628 /* block until all flush errors are consumed */
629 ib_drain_sq(ib_conn->qp);
636 * Called with state mutex held
638 static void iser_connect_error(struct rdma_cm_id *cma_id)
640 struct iser_conn *iser_conn;
642 iser_conn = (struct iser_conn *)cma_id->context;
643 iser_conn->state = ISER_CONN_TERMINATING;
647 iser_calc_scsi_params(struct iser_conn *iser_conn,
648 unsigned int max_sectors)
650 struct iser_device *device = iser_conn->ib_conn.device;
651 struct ib_device_attr *attr = &device->ib_device->attrs;
652 unsigned short sg_tablesize, sup_sg_tablesize;
653 unsigned short reserved_mr_pages;
657 * FRs without SG_GAPS or FMRs can only map up to a (device) page per
658 * entry, but if the first entry is misaligned we'll end up using two
659 * entries (head and tail) for a single page worth data, so one
660 * additional entry is required.
662 if ((attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) &&
663 (attr->device_cap_flags & IB_DEVICE_SG_GAPS_REG))
664 reserved_mr_pages = 0;
666 reserved_mr_pages = 1;
668 if (iser_conn->ib_conn.pi_support)
669 max_num_sg = attr->max_pi_fast_reg_page_list_len;
671 max_num_sg = attr->max_fast_reg_page_list_len;
673 sg_tablesize = DIV_ROUND_UP(max_sectors * 512, SIZE_4K);
674 if (attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS)
677 uint, ISCSI_ISER_MAX_SG_TABLESIZE,
678 max_num_sg - reserved_mr_pages);
680 sup_sg_tablesize = ISCSI_ISER_MAX_SG_TABLESIZE;
682 iser_conn->scsi_sg_tablesize = min(sg_tablesize, sup_sg_tablesize);
683 iser_conn->pages_per_mr =
684 iser_conn->scsi_sg_tablesize + reserved_mr_pages;
688 * Called with state mutex held
690 static void iser_addr_handler(struct rdma_cm_id *cma_id)
692 struct iser_device *device;
693 struct iser_conn *iser_conn;
694 struct ib_conn *ib_conn;
697 iser_conn = (struct iser_conn *)cma_id->context;
698 if (iser_conn->state != ISER_CONN_PENDING)
702 ib_conn = &iser_conn->ib_conn;
703 device = iser_device_find_by_ib_device(cma_id);
705 iser_err("device lookup/creation failed\n");
706 iser_connect_error(cma_id);
710 ib_conn->device = device;
712 /* connection T10-PI support */
713 if (iser_pi_enable) {
714 if (!(device->ib_device->attrs.device_cap_flags &
715 IB_DEVICE_INTEGRITY_HANDOVER)) {
716 iser_warn("T10-PI requested but not supported on %s, "
717 "continue without T10-PI\n",
718 dev_name(&ib_conn->device->ib_device->dev));
719 ib_conn->pi_support = false;
721 ib_conn->pi_support = true;
725 iser_calc_scsi_params(iser_conn, iser_max_sectors);
727 ret = rdma_resolve_route(cma_id, 1000);
729 iser_err("resolve route failed: %d\n", ret);
730 iser_connect_error(cma_id);
736 * Called with state mutex held
738 static void iser_route_handler(struct rdma_cm_id *cma_id)
740 struct rdma_conn_param conn_param;
742 struct iser_cm_hdr req_hdr;
743 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
744 struct ib_conn *ib_conn = &iser_conn->ib_conn;
745 struct iser_device *device = ib_conn->device;
747 if (iser_conn->state != ISER_CONN_PENDING)
751 ret = iser_create_ib_conn_res(ib_conn);
755 memset(&conn_param, 0, sizeof conn_param);
756 conn_param.responder_resources = device->ib_device->attrs.max_qp_rd_atom;
757 conn_param.initiator_depth = 1;
758 conn_param.retry_count = 7;
759 conn_param.rnr_retry_count = 6;
761 memset(&req_hdr, 0, sizeof(req_hdr));
762 req_hdr.flags = ISER_ZBVA_NOT_SUP;
763 if (!device->remote_inv_sup)
764 req_hdr.flags |= ISER_SEND_W_INV_NOT_SUP;
765 conn_param.private_data = (void *)&req_hdr;
766 conn_param.private_data_len = sizeof(struct iser_cm_hdr);
768 ret = rdma_connect(cma_id, &conn_param);
770 iser_err("failure connecting: %d\n", ret);
776 iser_connect_error(cma_id);
779 static void iser_connected_handler(struct rdma_cm_id *cma_id,
780 const void *private_data)
782 struct iser_conn *iser_conn;
783 struct ib_qp_attr attr;
784 struct ib_qp_init_attr init_attr;
786 iser_conn = (struct iser_conn *)cma_id->context;
787 if (iser_conn->state != ISER_CONN_PENDING)
791 (void)ib_query_qp(cma_id->qp, &attr, ~0, &init_attr);
792 iser_info("remote qpn:%x my qpn:%x\n", attr.dest_qp_num, cma_id->qp->qp_num);
795 u8 flags = *(u8 *)private_data;
797 iser_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP);
800 iser_info("conn %p: negotiated %s invalidation\n",
801 iser_conn, iser_conn->snd_w_inv ? "remote" : "local");
803 iser_conn->state = ISER_CONN_UP;
804 complete(&iser_conn->up_completion);
807 static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
809 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
811 if (iser_conn_terminate(iser_conn)) {
812 if (iser_conn->iscsi_conn)
813 iscsi_conn_failure(iser_conn->iscsi_conn,
814 ISCSI_ERR_CONN_FAILED);
816 iser_err("iscsi_iser connection isn't bound\n");
820 static void iser_cleanup_handler(struct rdma_cm_id *cma_id,
823 struct iser_conn *iser_conn = (struct iser_conn *)cma_id->context;
826 * We are not guaranteed that we visited disconnected_handler
827 * by now, call it here to be safe that we handle CM drep
830 iser_disconnected_handler(cma_id);
831 iser_free_ib_conn_res(iser_conn, destroy);
832 complete(&iser_conn->ib_completion);
835 static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
837 struct iser_conn *iser_conn;
840 iser_conn = (struct iser_conn *)cma_id->context;
841 iser_info("%s (%d): status %d conn %p id %p\n",
842 rdma_event_msg(event->event), event->event,
843 event->status, cma_id->context, cma_id);
845 mutex_lock(&iser_conn->state_mutex);
846 switch (event->event) {
847 case RDMA_CM_EVENT_ADDR_RESOLVED:
848 iser_addr_handler(cma_id);
850 case RDMA_CM_EVENT_ROUTE_RESOLVED:
851 iser_route_handler(cma_id);
853 case RDMA_CM_EVENT_ESTABLISHED:
854 iser_connected_handler(cma_id, event->param.conn.private_data);
856 case RDMA_CM_EVENT_REJECTED:
857 iser_info("Connection rejected: %s\n",
858 rdma_reject_msg(cma_id, event->status));
860 case RDMA_CM_EVENT_ADDR_ERROR:
861 case RDMA_CM_EVENT_ROUTE_ERROR:
862 case RDMA_CM_EVENT_CONNECT_ERROR:
863 case RDMA_CM_EVENT_UNREACHABLE:
864 iser_connect_error(cma_id);
866 case RDMA_CM_EVENT_DISCONNECTED:
867 case RDMA_CM_EVENT_ADDR_CHANGE:
868 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
869 iser_cleanup_handler(cma_id, false);
871 case RDMA_CM_EVENT_DEVICE_REMOVAL:
873 * we *must* destroy the device as we cannot rely
874 * on iscsid to be around to initiate error handling.
875 * also if we are not in state DOWN implicitly destroy
878 iser_cleanup_handler(cma_id, true);
879 if (iser_conn->state != ISER_CONN_DOWN) {
880 iser_conn->ib_conn.cma_id = NULL;
885 iser_err("Unexpected RDMA CM event: %s (%d)\n",
886 rdma_event_msg(event->event), event->event);
889 mutex_unlock(&iser_conn->state_mutex);
894 void iser_conn_init(struct iser_conn *iser_conn)
896 struct ib_conn *ib_conn = &iser_conn->ib_conn;
898 iser_conn->state = ISER_CONN_INIT;
899 init_completion(&iser_conn->stop_completion);
900 init_completion(&iser_conn->ib_completion);
901 init_completion(&iser_conn->up_completion);
902 INIT_LIST_HEAD(&iser_conn->conn_list);
903 mutex_init(&iser_conn->state_mutex);
905 ib_conn->post_recv_buf_count = 0;
906 ib_conn->reg_cqe.done = iser_reg_comp;
910 * starts the process of connecting to the target
911 * sleeps until the connection is established or rejected
913 int iser_connect(struct iser_conn *iser_conn,
914 struct sockaddr *src_addr,
915 struct sockaddr *dst_addr,
918 struct ib_conn *ib_conn = &iser_conn->ib_conn;
921 mutex_lock(&iser_conn->state_mutex);
923 sprintf(iser_conn->name, "%pISp", dst_addr);
925 iser_info("connecting to: %s\n", iser_conn->name);
927 /* the device is known only --after-- address resolution */
928 ib_conn->device = NULL;
930 iser_conn->state = ISER_CONN_PENDING;
932 ib_conn->cma_id = rdma_create_id(&init_net, iser_cma_handler,
934 RDMA_PS_TCP, IB_QPT_RC);
935 if (IS_ERR(ib_conn->cma_id)) {
936 err = PTR_ERR(ib_conn->cma_id);
937 iser_err("rdma_create_id failed: %d\n", err);
941 err = rdma_resolve_addr(ib_conn->cma_id, src_addr, dst_addr, 1000);
943 iser_err("rdma_resolve_addr failed: %d\n", err);
948 wait_for_completion_interruptible(&iser_conn->up_completion);
950 if (iser_conn->state != ISER_CONN_UP) {
952 goto connect_failure;
955 mutex_unlock(&iser_conn->state_mutex);
957 mutex_lock(&ig.connlist_mutex);
958 list_add(&iser_conn->conn_list, &ig.connlist);
959 mutex_unlock(&ig.connlist_mutex);
963 ib_conn->cma_id = NULL;
965 iser_conn->state = ISER_CONN_DOWN;
967 mutex_unlock(&iser_conn->state_mutex);
968 iser_conn_release(iser_conn);
972 int iser_post_recvl(struct iser_conn *iser_conn)
974 struct ib_conn *ib_conn = &iser_conn->ib_conn;
975 struct iser_login_desc *desc = &iser_conn->login_desc;
976 struct ib_recv_wr wr;
979 desc->sge.addr = desc->rsp_dma;
980 desc->sge.length = ISER_RX_LOGIN_SIZE;
981 desc->sge.lkey = ib_conn->device->pd->local_dma_lkey;
983 desc->cqe.done = iser_login_rsp;
984 wr.wr_cqe = &desc->cqe;
985 wr.sg_list = &desc->sge;
989 ib_conn->post_recv_buf_count++;
990 ib_ret = ib_post_recv(ib_conn->qp, &wr, NULL);
992 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
993 ib_conn->post_recv_buf_count--;
999 int iser_post_recvm(struct iser_conn *iser_conn, int count)
1001 struct ib_conn *ib_conn = &iser_conn->ib_conn;
1002 unsigned int my_rx_head = iser_conn->rx_desc_head;
1003 struct iser_rx_desc *rx_desc;
1004 struct ib_recv_wr *wr;
1007 for (wr = ib_conn->rx_wr, i = 0; i < count; i++, wr++) {
1008 rx_desc = &iser_conn->rx_descs[my_rx_head];
1009 rx_desc->cqe.done = iser_task_rsp;
1010 wr->wr_cqe = &rx_desc->cqe;
1011 wr->sg_list = &rx_desc->rx_sg;
1014 my_rx_head = (my_rx_head + 1) & iser_conn->qp_max_recv_dtos_mask;
1018 wr->next = NULL; /* mark end of work requests list */
1020 ib_conn->post_recv_buf_count += count;
1021 ib_ret = ib_post_recv(ib_conn->qp, ib_conn->rx_wr, NULL);
1023 iser_err("ib_post_recv failed ret=%d\n", ib_ret);
1024 ib_conn->post_recv_buf_count -= count;
1026 iser_conn->rx_desc_head = my_rx_head;
1033 * iser_start_send - Initiate a Send DTO operation
1035 * returns 0 on success, -1 on failure
1037 int iser_post_send(struct ib_conn *ib_conn, struct iser_tx_desc *tx_desc,
1040 struct ib_send_wr *wr = &tx_desc->send_wr;
1041 struct ib_send_wr *first_wr;
1044 ib_dma_sync_single_for_device(ib_conn->device->ib_device,
1045 tx_desc->dma_addr, ISER_HEADERS_LEN,
1049 wr->wr_cqe = &tx_desc->cqe;
1050 wr->sg_list = tx_desc->tx_sg;
1051 wr->num_sge = tx_desc->num_sge;
1052 wr->opcode = IB_WR_SEND;
1053 wr->send_flags = signal ? IB_SEND_SIGNALED : 0;
1055 if (tx_desc->inv_wr.next)
1056 first_wr = &tx_desc->inv_wr;
1057 else if (tx_desc->reg_wr.wr.next)
1058 first_wr = &tx_desc->reg_wr.wr;
1062 ib_ret = ib_post_send(ib_conn->qp, first_wr, NULL);
1064 iser_err("ib_post_send failed, ret:%d opcode:%d\n",
1065 ib_ret, wr->opcode);
1070 u8 iser_check_task_pi_status(struct iscsi_iser_task *iser_task,
1071 enum iser_data_dir cmd_dir, sector_t *sector)
1073 struct iser_mem_reg *reg = &iser_task->rdma_reg[cmd_dir];
1074 struct iser_fr_desc *desc = reg->mem_h;
1075 unsigned long sector_size = iser_task->sc->device->sector_size;
1076 struct ib_mr_status mr_status;
1079 if (desc && desc->sig_protected) {
1080 desc->sig_protected = 0;
1081 ret = ib_check_mr_status(desc->rsc.sig_mr,
1082 IB_MR_CHECK_SIG_STATUS, &mr_status);
1084 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1085 /* Not a lot we can do, return ambiguous guard error */
1090 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1091 sector_t sector_off = mr_status.sig_err.sig_err_offset;
1093 sector_div(sector_off, sector_size + 8);
1094 *sector = scsi_get_lba(iser_task->sc) + sector_off;
1096 pr_err("PI error found type %d at sector %llx "
1097 "expected %x vs actual %x\n",
1098 mr_status.sig_err.err_type,
1099 (unsigned long long)*sector,
1100 mr_status.sig_err.expected,
1101 mr_status.sig_err.actual);
1103 switch (mr_status.sig_err.err_type) {
1104 case IB_SIG_BAD_GUARD:
1106 case IB_SIG_BAD_REFTAG:
1108 case IB_SIG_BAD_APPTAG:
1117 void iser_err_comp(struct ib_wc *wc, const char *type)
1119 if (wc->status != IB_WC_WR_FLUSH_ERR) {
1120 struct iser_conn *iser_conn = to_iser_conn(wc->qp->qp_context);
1122 iser_err("%s failure: %s (%d) vend_err %#x\n", type,
1123 ib_wc_status_msg(wc->status), wc->status,
1126 if (iser_conn->iscsi_conn)
1127 iscsi_conn_failure(iser_conn->iscsi_conn,
1128 ISCSI_ERR_CONN_FAILED);
1130 iser_dbg("%s failure: %s (%d)\n", type,
1131 ib_wc_status_msg(wc->status), wc->status);