1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
4 * (c) Copyright 2013 Datera, Inc.
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
24 #include <linux/in6.h>
25 #include <rdma/ib_verbs.h>
26 #include <rdma/rdma_cm.h>
27 #include <target/target_core_base.h>
28 #include <target/target_core_fabric.h>
29 #include <target/iscsi/iscsi_transport.h>
30 #include <linux/semaphore.h>
34 #define ISERT_MAX_CONN 8
35 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
36 #define ISER_MAX_TX_CQ_LEN \
37 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
38 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
41 static int isert_debug_level;
42 module_param_named(debug_level, isert_debug_level, int, 0644);
43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
45 static DEFINE_MUTEX(device_list_mutex);
46 static LIST_HEAD(device_list);
47 static struct workqueue_struct *isert_comp_wq;
48 static struct workqueue_struct *isert_release_wq;
51 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
53 isert_login_post_recv(struct isert_conn *isert_conn);
55 isert_rdma_accept(struct isert_conn *isert_conn);
56 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
58 static void isert_release_work(struct work_struct *work);
59 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
60 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
61 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
62 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
65 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
67 return (conn->pi_support &&
68 cmd->prot_op != TARGET_PROT_NORMAL);
73 isert_qp_event_callback(struct ib_event *e, void *context)
75 struct isert_conn *isert_conn = context;
77 isert_err("%s (%d): conn %p\n",
78 ib_event_msg(e->event), e->event, isert_conn);
81 case IB_EVENT_COMM_EST:
82 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
84 case IB_EVENT_QP_LAST_WQE_REACHED:
85 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
92 static struct isert_comp *
93 isert_comp_get(struct isert_conn *isert_conn)
95 struct isert_device *device = isert_conn->device;
96 struct isert_comp *comp;
99 mutex_lock(&device_list_mutex);
100 for (i = 0; i < device->comps_used; i++)
101 if (device->comps[i].active_qps <
102 device->comps[min].active_qps)
104 comp = &device->comps[min];
106 mutex_unlock(&device_list_mutex);
108 isert_info("conn %p, using comp %p min_index: %d\n",
109 isert_conn, comp, min);
115 isert_comp_put(struct isert_comp *comp)
117 mutex_lock(&device_list_mutex);
119 mutex_unlock(&device_list_mutex);
122 static struct ib_qp *
123 isert_create_qp(struct isert_conn *isert_conn,
124 struct isert_comp *comp,
125 struct rdma_cm_id *cma_id)
127 struct isert_device *device = isert_conn->device;
128 struct ib_qp_init_attr attr;
131 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
132 attr.event_handler = isert_qp_event_callback;
133 attr.qp_context = isert_conn;
134 attr.send_cq = comp->cq;
135 attr.recv_cq = comp->cq;
136 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
137 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
138 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
139 attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
140 attr.cap.max_recv_sge = 1;
141 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
142 attr.qp_type = IB_QPT_RC;
143 if (device->pi_capable)
144 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
146 ret = rdma_create_qp(cma_id, device->pd, &attr);
148 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
156 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
158 struct isert_comp *comp;
161 comp = isert_comp_get(isert_conn);
162 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
163 if (IS_ERR(isert_conn->qp)) {
164 ret = PTR_ERR(isert_conn->qp);
170 isert_comp_put(comp);
175 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
177 struct isert_device *device = isert_conn->device;
178 struct ib_device *ib_dev = device->ib_device;
179 struct iser_rx_desc *rx_desc;
180 struct ib_sge *rx_sg;
184 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
185 sizeof(struct iser_rx_desc), GFP_KERNEL);
186 if (!isert_conn->rx_descs)
189 rx_desc = isert_conn->rx_descs;
191 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
192 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
193 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
194 if (ib_dma_mapping_error(ib_dev, dma_addr))
197 rx_desc->dma_addr = dma_addr;
199 rx_sg = &rx_desc->rx_sg;
200 rx_sg->addr = rx_desc->dma_addr;
201 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
202 rx_sg->lkey = device->pd->local_dma_lkey;
203 rx_desc->rx_cqe.done = isert_recv_done;
209 rx_desc = isert_conn->rx_descs;
210 for (j = 0; j < i; j++, rx_desc++) {
211 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
212 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
214 kfree(isert_conn->rx_descs);
215 isert_conn->rx_descs = NULL;
217 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
223 isert_free_rx_descriptors(struct isert_conn *isert_conn)
225 struct ib_device *ib_dev = isert_conn->device->ib_device;
226 struct iser_rx_desc *rx_desc;
229 if (!isert_conn->rx_descs)
232 rx_desc = isert_conn->rx_descs;
233 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
234 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
235 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
238 kfree(isert_conn->rx_descs);
239 isert_conn->rx_descs = NULL;
243 isert_free_comps(struct isert_device *device)
247 for (i = 0; i < device->comps_used; i++) {
248 struct isert_comp *comp = &device->comps[i];
251 ib_free_cq(comp->cq);
253 kfree(device->comps);
257 isert_alloc_comps(struct isert_device *device)
259 int i, max_cqe, ret = 0;
261 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
262 device->ib_device->num_comp_vectors));
264 isert_info("Using %d CQs, %s supports %d vectors support "
266 device->comps_used, device->ib_device->name,
267 device->ib_device->num_comp_vectors,
270 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
272 if (!device->comps) {
273 isert_err("Unable to allocate completion contexts\n");
277 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
279 for (i = 0; i < device->comps_used; i++) {
280 struct isert_comp *comp = &device->comps[i];
282 comp->device = device;
283 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
285 if (IS_ERR(comp->cq)) {
286 isert_err("Unable to allocate cq\n");
287 ret = PTR_ERR(comp->cq);
295 isert_free_comps(device);
300 isert_create_device_ib_res(struct isert_device *device)
302 struct ib_device *ib_dev = device->ib_device;
305 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
306 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
308 ret = isert_alloc_comps(device);
312 device->pd = ib_alloc_pd(ib_dev);
313 if (IS_ERR(device->pd)) {
314 ret = PTR_ERR(device->pd);
315 isert_err("failed to allocate pd, device %p, ret=%d\n",
320 /* Check signature cap */
321 device->pi_capable = ib_dev->attrs.device_cap_flags &
322 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
327 isert_free_comps(device);
335 isert_free_device_ib_res(struct isert_device *device)
337 isert_info("device %p\n", device);
339 ib_dealloc_pd(device->pd);
340 isert_free_comps(device);
344 isert_device_put(struct isert_device *device)
346 mutex_lock(&device_list_mutex);
348 isert_info("device %p refcount %d\n", device, device->refcount);
349 if (!device->refcount) {
350 isert_free_device_ib_res(device);
351 list_del(&device->dev_node);
354 mutex_unlock(&device_list_mutex);
357 static struct isert_device *
358 isert_device_get(struct rdma_cm_id *cma_id)
360 struct isert_device *device;
363 mutex_lock(&device_list_mutex);
364 list_for_each_entry(device, &device_list, dev_node) {
365 if (device->ib_device->node_guid == cma_id->device->node_guid) {
367 isert_info("Found iser device %p refcount %d\n",
368 device, device->refcount);
369 mutex_unlock(&device_list_mutex);
374 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
376 mutex_unlock(&device_list_mutex);
377 return ERR_PTR(-ENOMEM);
380 INIT_LIST_HEAD(&device->dev_node);
382 device->ib_device = cma_id->device;
383 ret = isert_create_device_ib_res(device);
386 mutex_unlock(&device_list_mutex);
391 list_add_tail(&device->dev_node, &device_list);
392 isert_info("Created a new iser device %p refcount %d\n",
393 device, device->refcount);
394 mutex_unlock(&device_list_mutex);
400 isert_init_conn(struct isert_conn *isert_conn)
402 isert_conn->state = ISER_CONN_INIT;
403 INIT_LIST_HEAD(&isert_conn->node);
404 init_completion(&isert_conn->login_comp);
405 init_completion(&isert_conn->login_req_comp);
406 kref_init(&isert_conn->kref);
407 mutex_init(&isert_conn->mutex);
408 INIT_WORK(&isert_conn->release_work, isert_release_work);
412 isert_free_login_buf(struct isert_conn *isert_conn)
414 struct ib_device *ib_dev = isert_conn->device->ib_device;
416 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
417 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
418 kfree(isert_conn->login_rsp_buf);
420 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
421 ISER_RX_PAYLOAD_SIZE,
423 kfree(isert_conn->login_req_buf);
427 isert_alloc_login_buf(struct isert_conn *isert_conn,
428 struct ib_device *ib_dev)
432 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
434 if (!isert_conn->login_req_buf) {
435 isert_err("Unable to allocate isert_conn->login_buf\n");
439 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
440 isert_conn->login_req_buf,
441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
442 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
444 isert_err("login_req_dma mapping error: %d\n", ret);
445 isert_conn->login_req_dma = 0;
446 goto out_free_login_req_buf;
449 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
450 if (!isert_conn->login_rsp_buf) {
451 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
452 goto out_unmap_login_req_buf;
455 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
456 isert_conn->login_rsp_buf,
457 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
458 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
460 isert_err("login_rsp_dma mapping error: %d\n", ret);
461 isert_conn->login_rsp_dma = 0;
462 goto out_free_login_rsp_buf;
467 out_free_login_rsp_buf:
468 kfree(isert_conn->login_rsp_buf);
469 out_unmap_login_req_buf:
470 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
471 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
472 out_free_login_req_buf:
473 kfree(isert_conn->login_req_buf);
478 isert_set_nego_params(struct isert_conn *isert_conn,
479 struct rdma_conn_param *param)
481 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
483 /* Set max inflight RDMA READ requests */
484 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
485 attr->max_qp_init_rd_atom);
486 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
488 if (param->private_data) {
489 u8 flags = *(u8 *)param->private_data;
492 * use remote invalidation if the both initiator
493 * and the HCA support it
495 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
496 (attr->device_cap_flags &
497 IB_DEVICE_MEM_MGT_EXTENSIONS);
498 if (isert_conn->snd_w_inv)
499 isert_info("Using remote invalidation\n");
504 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
506 struct isert_np *isert_np = cma_id->context;
507 struct iscsi_np *np = isert_np->np;
508 struct isert_conn *isert_conn;
509 struct isert_device *device;
512 spin_lock_bh(&np->np_thread_lock);
514 spin_unlock_bh(&np->np_thread_lock);
515 isert_dbg("iscsi_np is not enabled, reject connect request\n");
516 return rdma_reject(cma_id, NULL, 0);
518 spin_unlock_bh(&np->np_thread_lock);
520 isert_dbg("cma_id: %p, portal: %p\n",
521 cma_id, cma_id->context);
523 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
527 isert_init_conn(isert_conn);
528 isert_conn->cm_id = cma_id;
530 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
534 device = isert_device_get(cma_id);
535 if (IS_ERR(device)) {
536 ret = PTR_ERR(device);
537 goto out_rsp_dma_map;
539 isert_conn->device = device;
541 isert_set_nego_params(isert_conn, &event->param.conn);
543 ret = isert_conn_setup_qp(isert_conn, cma_id);
547 ret = isert_login_post_recv(isert_conn);
551 ret = isert_rdma_accept(isert_conn);
555 mutex_lock(&isert_np->mutex);
556 list_add_tail(&isert_conn->node, &isert_np->accepted);
557 mutex_unlock(&isert_np->mutex);
562 isert_device_put(device);
564 isert_free_login_buf(isert_conn);
567 rdma_reject(cma_id, NULL, 0);
572 isert_connect_release(struct isert_conn *isert_conn)
574 struct isert_device *device = isert_conn->device;
576 isert_dbg("conn %p\n", isert_conn);
580 isert_free_rx_descriptors(isert_conn);
581 if (isert_conn->cm_id)
582 rdma_destroy_id(isert_conn->cm_id);
584 if (isert_conn->qp) {
585 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
587 isert_comp_put(comp);
588 ib_destroy_qp(isert_conn->qp);
591 if (isert_conn->login_req_buf)
592 isert_free_login_buf(isert_conn);
594 isert_device_put(device);
600 isert_connected_handler(struct rdma_cm_id *cma_id)
602 struct isert_conn *isert_conn = cma_id->qp->qp_context;
603 struct isert_np *isert_np = cma_id->context;
605 isert_info("conn %p\n", isert_conn);
607 mutex_lock(&isert_conn->mutex);
608 isert_conn->state = ISER_CONN_UP;
609 kref_get(&isert_conn->kref);
610 mutex_unlock(&isert_conn->mutex);
612 mutex_lock(&isert_np->mutex);
613 list_move_tail(&isert_conn->node, &isert_np->pending);
614 mutex_unlock(&isert_np->mutex);
616 isert_info("np %p: Allow accept_np to continue\n", isert_np);
621 isert_release_kref(struct kref *kref)
623 struct isert_conn *isert_conn = container_of(kref,
624 struct isert_conn, kref);
626 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
629 isert_connect_release(isert_conn);
633 isert_put_conn(struct isert_conn *isert_conn)
635 kref_put(&isert_conn->kref, isert_release_kref);
639 isert_handle_unbound_conn(struct isert_conn *isert_conn)
641 struct isert_np *isert_np = isert_conn->cm_id->context;
643 mutex_lock(&isert_np->mutex);
644 if (!list_empty(&isert_conn->node)) {
646 * This means iscsi doesn't know this connection
647 * so schedule a cleanup ourselves
649 list_del_init(&isert_conn->node);
650 isert_put_conn(isert_conn);
651 queue_work(isert_release_wq, &isert_conn->release_work);
653 mutex_unlock(&isert_np->mutex);
657 * isert_conn_terminate() - Initiate connection termination
658 * @isert_conn: isert connection struct
661 * In case the connection state is BOUND, move state
662 * to TEMINATING and start teardown sequence (rdma_disconnect).
663 * In case the connection state is UP, complete flush as well.
665 * This routine must be called with mutex held. Thus it is
666 * safe to call multiple times.
669 isert_conn_terminate(struct isert_conn *isert_conn)
673 if (isert_conn->state >= ISER_CONN_TERMINATING)
676 isert_info("Terminating conn %p state %d\n",
677 isert_conn, isert_conn->state);
678 isert_conn->state = ISER_CONN_TERMINATING;
679 err = rdma_disconnect(isert_conn->cm_id);
681 isert_warn("Failed rdma_disconnect isert_conn %p\n",
686 isert_np_cma_handler(struct isert_np *isert_np,
687 enum rdma_cm_event_type event)
689 isert_dbg("%s (%d): isert np %p\n",
690 rdma_event_msg(event), event, isert_np);
693 case RDMA_CM_EVENT_DEVICE_REMOVAL:
694 isert_np->cm_id = NULL;
696 case RDMA_CM_EVENT_ADDR_CHANGE:
697 isert_np->cm_id = isert_setup_id(isert_np);
698 if (IS_ERR(isert_np->cm_id)) {
699 isert_err("isert np %p setup id failed: %ld\n",
700 isert_np, PTR_ERR(isert_np->cm_id));
701 isert_np->cm_id = NULL;
705 isert_err("isert np %p Unexpected event %d\n",
713 isert_disconnected_handler(struct rdma_cm_id *cma_id,
714 enum rdma_cm_event_type event)
716 struct isert_conn *isert_conn = cma_id->qp->qp_context;
718 mutex_lock(&isert_conn->mutex);
719 switch (isert_conn->state) {
720 case ISER_CONN_TERMINATING:
723 isert_conn_terminate(isert_conn);
724 ib_drain_qp(isert_conn->qp);
725 isert_handle_unbound_conn(isert_conn);
727 case ISER_CONN_BOUND:
728 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
729 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
732 isert_warn("conn %p teminating in state %d\n",
733 isert_conn, isert_conn->state);
735 mutex_unlock(&isert_conn->mutex);
741 isert_connect_error(struct rdma_cm_id *cma_id)
743 struct isert_conn *isert_conn = cma_id->qp->qp_context;
745 list_del_init(&isert_conn->node);
746 isert_conn->cm_id = NULL;
747 isert_put_conn(isert_conn);
753 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
755 struct isert_np *isert_np = cma_id->context;
758 isert_info("%s (%d): status %d id %p np %p\n",
759 rdma_event_msg(event->event), event->event,
760 event->status, cma_id, cma_id->context);
762 if (isert_np->cm_id == cma_id)
763 return isert_np_cma_handler(cma_id->context, event->event);
765 switch (event->event) {
766 case RDMA_CM_EVENT_CONNECT_REQUEST:
767 ret = isert_connect_request(cma_id, event);
769 isert_err("failed handle connect request %d\n", ret);
771 case RDMA_CM_EVENT_ESTABLISHED:
772 isert_connected_handler(cma_id);
774 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
775 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
776 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
777 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
778 ret = isert_disconnected_handler(cma_id, event->event);
780 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
781 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
782 case RDMA_CM_EVENT_CONNECT_ERROR:
783 ret = isert_connect_error(cma_id);
786 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
794 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
796 struct ib_recv_wr *rx_wr, *rx_wr_failed;
798 struct iser_rx_desc *rx_desc;
800 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
801 rx_desc = &isert_conn->rx_descs[i];
803 rx_wr->wr_cqe = &rx_desc->rx_cqe;
804 rx_wr->sg_list = &rx_desc->rx_sg;
806 rx_wr->next = rx_wr + 1;
809 rx_wr->next = NULL; /* mark end of work requests list */
811 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
814 isert_err("ib_post_recv() failed with ret: %d\n", ret);
820 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
822 struct ib_recv_wr *rx_wr_failed, rx_wr;
825 rx_wr.wr_cqe = &rx_desc->rx_cqe;
826 rx_wr.sg_list = &rx_desc->rx_sg;
830 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
832 isert_err("ib_post_recv() failed with ret: %d\n", ret);
838 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
840 struct ib_device *ib_dev = isert_conn->cm_id->device;
841 struct ib_send_wr send_wr, *send_wr_failed;
844 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
845 ISER_HEADERS_LEN, DMA_TO_DEVICE);
847 tx_desc->tx_cqe.done = isert_login_send_done;
850 send_wr.wr_cqe = &tx_desc->tx_cqe;
851 send_wr.sg_list = tx_desc->tx_sg;
852 send_wr.num_sge = tx_desc->num_sge;
853 send_wr.opcode = IB_WR_SEND;
854 send_wr.send_flags = IB_SEND_SIGNALED;
856 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
858 isert_err("ib_post_send() failed, ret: %d\n", ret);
864 isert_create_send_desc(struct isert_conn *isert_conn,
865 struct isert_cmd *isert_cmd,
866 struct iser_tx_desc *tx_desc)
868 struct isert_device *device = isert_conn->device;
869 struct ib_device *ib_dev = device->ib_device;
871 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
872 ISER_HEADERS_LEN, DMA_TO_DEVICE);
874 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
875 tx_desc->iser_header.flags = ISCSI_CTRL;
877 tx_desc->num_sge = 1;
879 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
880 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
881 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
886 isert_init_tx_hdrs(struct isert_conn *isert_conn,
887 struct iser_tx_desc *tx_desc)
889 struct isert_device *device = isert_conn->device;
890 struct ib_device *ib_dev = device->ib_device;
893 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
894 ISER_HEADERS_LEN, DMA_TO_DEVICE);
895 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
896 isert_err("ib_dma_mapping_error() failed\n");
900 tx_desc->dma_addr = dma_addr;
901 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
902 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
903 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
905 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
906 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
907 tx_desc->tx_sg[0].lkey);
913 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
914 struct ib_send_wr *send_wr)
916 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
918 tx_desc->tx_cqe.done = isert_send_done;
919 send_wr->wr_cqe = &tx_desc->tx_cqe;
921 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
922 send_wr->opcode = IB_WR_SEND_WITH_INV;
923 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
925 send_wr->opcode = IB_WR_SEND;
928 send_wr->sg_list = &tx_desc->tx_sg[0];
929 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
930 send_wr->send_flags = IB_SEND_SIGNALED;
934 isert_login_post_recv(struct isert_conn *isert_conn)
936 struct ib_recv_wr rx_wr, *rx_wr_fail;
940 memset(&sge, 0, sizeof(struct ib_sge));
941 sge.addr = isert_conn->login_req_dma;
942 sge.length = ISER_RX_PAYLOAD_SIZE;
943 sge.lkey = isert_conn->device->pd->local_dma_lkey;
945 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
946 sge.addr, sge.length, sge.lkey);
948 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
950 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
951 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
952 rx_wr.sg_list = &sge;
955 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
957 isert_err("ib_post_recv() failed: %d\n", ret);
963 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
966 struct isert_conn *isert_conn = conn->context;
967 struct isert_device *device = isert_conn->device;
968 struct ib_device *ib_dev = device->ib_device;
969 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
972 isert_create_send_desc(isert_conn, NULL, tx_desc);
974 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
975 sizeof(struct iscsi_hdr));
977 isert_init_tx_hdrs(isert_conn, tx_desc);
980 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
982 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
983 length, DMA_TO_DEVICE);
985 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
987 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
988 length, DMA_TO_DEVICE);
990 tx_dsg->addr = isert_conn->login_rsp_dma;
991 tx_dsg->length = length;
992 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
993 tx_desc->num_sge = 2;
995 if (!login->login_failed) {
996 if (login->login_complete) {
997 ret = isert_alloc_rx_descriptors(isert_conn);
1001 ret = isert_post_recvm(isert_conn,
1002 ISERT_QP_MAX_RECV_DTOS);
1006 /* Now we are in FULL_FEATURE phase */
1007 mutex_lock(&isert_conn->mutex);
1008 isert_conn->state = ISER_CONN_FULL_FEATURE;
1009 mutex_unlock(&isert_conn->mutex);
1013 ret = isert_login_post_recv(isert_conn);
1018 ret = isert_login_post_send(isert_conn, tx_desc);
1026 isert_rx_login_req(struct isert_conn *isert_conn)
1028 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1029 int rx_buflen = isert_conn->login_req_len;
1030 struct iscsi_conn *conn = isert_conn->conn;
1031 struct iscsi_login *login = conn->conn_login;
1034 isert_info("conn %p\n", isert_conn);
1036 WARN_ON_ONCE(!login);
1038 if (login->first_request) {
1039 struct iscsi_login_req *login_req =
1040 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1042 * Setup the initial iscsi_login values from the leading
1043 * login request PDU.
1045 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1046 login->current_stage =
1047 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1049 login->version_min = login_req->min_version;
1050 login->version_max = login_req->max_version;
1051 memcpy(login->isid, login_req->isid, 6);
1052 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1053 login->init_task_tag = login_req->itt;
1054 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1055 login->cid = be16_to_cpu(login_req->cid);
1056 login->tsih = be16_to_cpu(login_req->tsih);
1059 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1061 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1062 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1063 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1064 MAX_KEY_VALUE_PAIRS);
1065 memcpy(login->req_buf, &rx_desc->data[0], size);
1067 if (login->first_request) {
1068 complete(&isert_conn->login_comp);
1071 schedule_delayed_work(&conn->login_work, 0);
1074 static struct iscsi_cmd
1075 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1077 struct isert_conn *isert_conn = conn->context;
1078 struct isert_cmd *isert_cmd;
1079 struct iscsi_cmd *cmd;
1081 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1083 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1086 isert_cmd = iscsit_priv_cmd(cmd);
1087 isert_cmd->conn = isert_conn;
1088 isert_cmd->iscsi_cmd = cmd;
1089 isert_cmd->rx_desc = rx_desc;
1095 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1096 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1097 struct iser_rx_desc *rx_desc, unsigned char *buf)
1099 struct iscsi_conn *conn = isert_conn->conn;
1100 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1101 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1102 bool dump_payload = false;
1103 unsigned int data_len;
1105 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1109 imm_data = cmd->immediate_data;
1110 imm_data_len = cmd->first_burst_len;
1111 unsol_data = cmd->unsolicited_data;
1112 data_len = cmd->se_cmd.data_length;
1114 if (imm_data && imm_data_len == data_len)
1115 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1116 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1119 } else if (rc > 0) {
1120 dump_payload = true;
1127 if (imm_data_len != data_len) {
1128 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1129 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1130 &rx_desc->data[0], imm_data_len);
1131 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1132 sg_nents, imm_data_len);
1134 sg_init_table(&isert_cmd->sg, 1);
1135 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1136 cmd->se_cmd.t_data_nents = 1;
1137 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1138 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1142 cmd->write_data_done += imm_data_len;
1144 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1145 spin_lock_bh(&cmd->istate_lock);
1146 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1147 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1148 spin_unlock_bh(&cmd->istate_lock);
1152 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1154 if (!rc && dump_payload == false && unsol_data)
1155 iscsit_set_unsoliticed_dataout(cmd);
1156 else if (dump_payload && imm_data)
1157 target_put_sess_cmd(&cmd->se_cmd);
1163 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1164 struct iser_rx_desc *rx_desc, unsigned char *buf)
1166 struct scatterlist *sg_start;
1167 struct iscsi_conn *conn = isert_conn->conn;
1168 struct iscsi_cmd *cmd = NULL;
1169 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1170 u32 unsol_data_len = ntoh24(hdr->dlength);
1171 int rc, sg_nents, sg_off, page_off;
1173 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1179 * FIXME: Unexpected unsolicited_data out
1181 if (!cmd->unsolicited_data) {
1182 isert_err("Received unexpected solicited data payload\n");
1187 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1188 "write_data_done: %u, data_length: %u\n",
1189 unsol_data_len, cmd->write_data_done,
1190 cmd->se_cmd.data_length);
1192 sg_off = cmd->write_data_done / PAGE_SIZE;
1193 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1194 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1195 page_off = cmd->write_data_done % PAGE_SIZE;
1197 * FIXME: Non page-aligned unsolicited_data out
1200 isert_err("unexpected non-page aligned data payload\n");
1204 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1205 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1206 sg_nents, &rx_desc->data[0], unsol_data_len);
1208 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1211 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1216 * multiple data-outs on the same command can arrive -
1217 * so post the buffer before hand
1219 rc = isert_post_recv(isert_conn, rx_desc);
1221 isert_err("ib_post_recv failed with %d\n", rc);
1228 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1229 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1232 struct iscsi_conn *conn = isert_conn->conn;
1233 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1236 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1240 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1243 return iscsit_process_nop_out(conn, cmd, hdr);
1247 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1248 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1249 struct iscsi_text *hdr)
1251 struct iscsi_conn *conn = isert_conn->conn;
1252 u32 payload_length = ntoh24(hdr->dlength);
1254 unsigned char *text_in = NULL;
1256 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1260 if (payload_length) {
1261 text_in = kzalloc(payload_length, GFP_KERNEL);
1263 isert_err("Unable to allocate text_in of payload_length: %u\n",
1268 cmd->text_in_ptr = text_in;
1270 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1272 return iscsit_process_text_cmd(conn, cmd, hdr);
1276 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1277 uint32_t read_stag, uint64_t read_va,
1278 uint32_t write_stag, uint64_t write_va)
1280 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1281 struct iscsi_conn *conn = isert_conn->conn;
1282 struct iscsi_cmd *cmd;
1283 struct isert_cmd *isert_cmd;
1285 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1287 if (conn->sess->sess_ops->SessionType &&
1288 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1289 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1290 " ignoring\n", opcode);
1295 case ISCSI_OP_SCSI_CMD:
1296 cmd = isert_allocate_cmd(conn, rx_desc);
1300 isert_cmd = iscsit_priv_cmd(cmd);
1301 isert_cmd->read_stag = read_stag;
1302 isert_cmd->read_va = read_va;
1303 isert_cmd->write_stag = write_stag;
1304 isert_cmd->write_va = write_va;
1305 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1307 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1308 rx_desc, (unsigned char *)hdr);
1310 case ISCSI_OP_NOOP_OUT:
1311 cmd = isert_allocate_cmd(conn, rx_desc);
1315 isert_cmd = iscsit_priv_cmd(cmd);
1316 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1317 rx_desc, (unsigned char *)hdr);
1319 case ISCSI_OP_SCSI_DATA_OUT:
1320 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1321 (unsigned char *)hdr);
1323 case ISCSI_OP_SCSI_TMFUNC:
1324 cmd = isert_allocate_cmd(conn, rx_desc);
1328 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1329 (unsigned char *)hdr);
1331 case ISCSI_OP_LOGOUT:
1332 cmd = isert_allocate_cmd(conn, rx_desc);
1336 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1339 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1340 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1342 cmd = isert_allocate_cmd(conn, rx_desc);
1347 isert_cmd = iscsit_priv_cmd(cmd);
1348 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1349 rx_desc, (struct iscsi_text *)hdr);
1352 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1361 isert_print_wc(struct ib_wc *wc, const char *type)
1363 if (wc->status != IB_WC_WR_FLUSH_ERR)
1364 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1365 ib_wc_status_msg(wc->status), wc->status,
1368 isert_dbg("%s failure: %s (%d)\n", type,
1369 ib_wc_status_msg(wc->status), wc->status);
1373 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1375 struct isert_conn *isert_conn = wc->qp->qp_context;
1376 struct ib_device *ib_dev = isert_conn->cm_id->device;
1377 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1378 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1379 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1380 uint64_t read_va = 0, write_va = 0;
1381 uint32_t read_stag = 0, write_stag = 0;
1383 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384 isert_print_wc(wc, "recv");
1385 if (wc->status != IB_WC_WR_FLUSH_ERR)
1386 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1390 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1391 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1393 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1394 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1395 (int)(wc->byte_len - ISER_HEADERS_LEN));
1397 switch (iser_ctrl->flags & 0xF0) {
1399 if (iser_ctrl->flags & ISER_RSV) {
1400 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1401 read_va = be64_to_cpu(iser_ctrl->read_va);
1402 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1403 read_stag, (unsigned long long)read_va);
1405 if (iser_ctrl->flags & ISER_WSV) {
1406 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1407 write_va = be64_to_cpu(iser_ctrl->write_va);
1408 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1409 write_stag, (unsigned long long)write_va);
1412 isert_dbg("ISER ISCSI_CTRL PDU\n");
1415 isert_err("iSER Hello message\n");
1418 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1422 isert_rx_opcode(isert_conn, rx_desc,
1423 read_stag, read_va, write_stag, write_va);
1425 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1426 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1430 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1432 struct isert_conn *isert_conn = wc->qp->qp_context;
1433 struct ib_device *ib_dev = isert_conn->cm_id->device;
1435 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1436 isert_print_wc(wc, "login recv");
1440 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1443 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1445 if (isert_conn->conn) {
1446 struct iscsi_login *login = isert_conn->conn->conn_login;
1448 if (login && !login->first_request)
1449 isert_rx_login_req(isert_conn);
1452 mutex_lock(&isert_conn->mutex);
1453 complete(&isert_conn->login_req_comp);
1454 mutex_unlock(&isert_conn->mutex);
1456 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1457 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1461 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1463 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1464 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1466 if (!cmd->rw.nr_ops)
1469 if (isert_prot_cmd(conn, se_cmd)) {
1470 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1471 conn->cm_id->port_num, se_cmd->t_data_sg,
1472 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1473 se_cmd->t_prot_nents, dir);
1475 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1476 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1483 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1485 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1486 struct isert_conn *isert_conn = isert_cmd->conn;
1487 struct iscsi_conn *conn = isert_conn->conn;
1488 struct iscsi_text_rsp *hdr;
1490 isert_dbg("Cmd %p\n", isert_cmd);
1492 switch (cmd->iscsi_opcode) {
1493 case ISCSI_OP_SCSI_CMD:
1494 spin_lock_bh(&conn->cmd_lock);
1495 if (!list_empty(&cmd->i_conn_node))
1496 list_del_init(&cmd->i_conn_node);
1497 spin_unlock_bh(&conn->cmd_lock);
1499 if (cmd->data_direction == DMA_TO_DEVICE) {
1500 iscsit_stop_dataout_timer(cmd);
1502 * Check for special case during comp_err where
1503 * WRITE_PENDING has been handed off from core,
1504 * but requires an extra target_put_sess_cmd()
1505 * before transport_generic_free_cmd() below.
1508 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1509 struct se_cmd *se_cmd = &cmd->se_cmd;
1511 target_put_sess_cmd(se_cmd);
1515 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1516 transport_generic_free_cmd(&cmd->se_cmd, 0);
1518 case ISCSI_OP_SCSI_TMFUNC:
1519 spin_lock_bh(&conn->cmd_lock);
1520 if (!list_empty(&cmd->i_conn_node))
1521 list_del_init(&cmd->i_conn_node);
1522 spin_unlock_bh(&conn->cmd_lock);
1524 transport_generic_free_cmd(&cmd->se_cmd, 0);
1526 case ISCSI_OP_REJECT:
1527 case ISCSI_OP_NOOP_OUT:
1529 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1530 /* If the continue bit is on, keep the command alive */
1531 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1534 spin_lock_bh(&conn->cmd_lock);
1535 if (!list_empty(&cmd->i_conn_node))
1536 list_del_init(&cmd->i_conn_node);
1537 spin_unlock_bh(&conn->cmd_lock);
1540 * Handle special case for REJECT when iscsi_add_reject*() has
1541 * overwritten the original iscsi_opcode assignment, and the
1542 * associated cmd->se_cmd needs to be released.
1544 if (cmd->se_cmd.se_tfo != NULL) {
1545 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1547 transport_generic_free_cmd(&cmd->se_cmd, 0);
1554 iscsit_release_cmd(cmd);
1560 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1562 if (tx_desc->dma_addr != 0) {
1563 isert_dbg("unmap single for tx_desc->dma_addr\n");
1564 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1565 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1566 tx_desc->dma_addr = 0;
1571 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1572 struct ib_device *ib_dev, bool comp_err)
1574 if (isert_cmd->pdu_buf_dma != 0) {
1575 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1576 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1577 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1578 isert_cmd->pdu_buf_dma = 0;
1581 isert_unmap_tx_desc(tx_desc, ib_dev);
1582 isert_put_cmd(isert_cmd, comp_err);
1586 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1588 struct ib_mr_status mr_status;
1591 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1593 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1594 goto fail_mr_status;
1597 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1599 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1601 switch (mr_status.sig_err.err_type) {
1602 case IB_SIG_BAD_GUARD:
1603 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1605 case IB_SIG_BAD_REFTAG:
1606 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1608 case IB_SIG_BAD_APPTAG:
1609 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1612 sec_offset_err = mr_status.sig_err.sig_err_offset;
1613 do_div(sec_offset_err, block_size);
1614 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1616 isert_err("PI error found type %d at sector 0x%llx "
1617 "expected 0x%x vs actual 0x%x\n",
1618 mr_status.sig_err.err_type,
1619 (unsigned long long)se_cmd->bad_sector,
1620 mr_status.sig_err.expected,
1621 mr_status.sig_err.actual);
1630 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1632 struct isert_conn *isert_conn = wc->qp->qp_context;
1633 struct isert_device *device = isert_conn->device;
1634 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1635 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1636 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1639 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1640 isert_print_wc(wc, "rdma write");
1641 if (wc->status != IB_WC_WR_FLUSH_ERR)
1642 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1643 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1647 isert_dbg("Cmd %p\n", isert_cmd);
1649 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1650 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1653 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1655 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1659 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1661 struct isert_conn *isert_conn = wc->qp->qp_context;
1662 struct isert_device *device = isert_conn->device;
1663 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1664 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1665 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1666 struct se_cmd *se_cmd = &cmd->se_cmd;
1669 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1670 isert_print_wc(wc, "rdma read");
1671 if (wc->status != IB_WC_WR_FLUSH_ERR)
1672 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1673 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1677 isert_dbg("Cmd %p\n", isert_cmd);
1679 iscsit_stop_dataout_timer(cmd);
1681 if (isert_prot_cmd(isert_conn, se_cmd))
1682 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1683 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1684 cmd->write_data_done = 0;
1686 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1687 spin_lock_bh(&cmd->istate_lock);
1688 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1689 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1690 spin_unlock_bh(&cmd->istate_lock);
1693 target_put_sess_cmd(se_cmd);
1694 transport_send_check_condition_and_sense(se_cmd,
1697 target_execute_cmd(se_cmd);
1702 isert_do_control_comp(struct work_struct *work)
1704 struct isert_cmd *isert_cmd = container_of(work,
1705 struct isert_cmd, comp_work);
1706 struct isert_conn *isert_conn = isert_cmd->conn;
1707 struct ib_device *ib_dev = isert_conn->cm_id->device;
1708 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1710 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1712 switch (cmd->i_state) {
1713 case ISTATE_SEND_TASKMGTRSP:
1714 iscsit_tmr_post_handler(cmd, cmd->conn);
1715 case ISTATE_SEND_REJECT: /* FALLTHRU */
1716 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1717 cmd->i_state = ISTATE_SENT_STATUS;
1718 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1721 case ISTATE_SEND_LOGOUTRSP:
1722 iscsit_logout_post_handler(cmd, cmd->conn);
1725 isert_err("Unknown i_state %d\n", cmd->i_state);
1732 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1734 struct isert_conn *isert_conn = wc->qp->qp_context;
1735 struct ib_device *ib_dev = isert_conn->cm_id->device;
1736 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1738 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1739 isert_print_wc(wc, "login send");
1740 if (wc->status != IB_WC_WR_FLUSH_ERR)
1741 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1744 isert_unmap_tx_desc(tx_desc, ib_dev);
1748 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1750 struct isert_conn *isert_conn = wc->qp->qp_context;
1751 struct ib_device *ib_dev = isert_conn->cm_id->device;
1752 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1753 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1755 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1756 isert_print_wc(wc, "send");
1757 if (wc->status != IB_WC_WR_FLUSH_ERR)
1758 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1759 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1763 isert_dbg("Cmd %p\n", isert_cmd);
1765 switch (isert_cmd->iscsi_cmd->i_state) {
1766 case ISTATE_SEND_TASKMGTRSP:
1767 case ISTATE_SEND_LOGOUTRSP:
1768 case ISTATE_SEND_REJECT:
1769 case ISTATE_SEND_TEXTRSP:
1770 isert_unmap_tx_desc(tx_desc, ib_dev);
1772 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1773 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1776 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1777 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1783 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1785 struct ib_send_wr *wr_failed;
1788 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1790 isert_err("ib_post_recv failed with %d\n", ret);
1794 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1797 isert_err("ib_post_send failed with %d\n", ret);
1804 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1806 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1807 struct isert_conn *isert_conn = conn->context;
1808 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1809 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1810 &isert_cmd->tx_desc.iscsi_header;
1812 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1813 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1814 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1816 * Attach SENSE DATA payload to iSCSI Response PDU
1818 if (cmd->se_cmd.sense_buffer &&
1819 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1820 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1821 struct isert_device *device = isert_conn->device;
1822 struct ib_device *ib_dev = device->ib_device;
1823 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1824 u32 padding, pdu_len;
1826 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1828 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1830 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1831 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1832 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1834 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1835 (void *)cmd->sense_buffer, pdu_len,
1838 isert_cmd->pdu_buf_len = pdu_len;
1839 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1840 tx_dsg->length = pdu_len;
1841 tx_dsg->lkey = device->pd->local_dma_lkey;
1842 isert_cmd->tx_desc.num_sge = 2;
1845 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1847 isert_dbg("Posting SCSI Response\n");
1849 return isert_post_response(isert_conn, isert_cmd);
1853 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1855 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1856 struct isert_conn *isert_conn = conn->context;
1858 spin_lock_bh(&conn->cmd_lock);
1859 if (!list_empty(&cmd->i_conn_node))
1860 list_del_init(&cmd->i_conn_node);
1861 spin_unlock_bh(&conn->cmd_lock);
1863 if (cmd->data_direction == DMA_TO_DEVICE)
1864 iscsit_stop_dataout_timer(cmd);
1865 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1868 static enum target_prot_op
1869 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1871 struct isert_conn *isert_conn = conn->context;
1872 struct isert_device *device = isert_conn->device;
1874 if (conn->tpg->tpg_attrib.t10_pi) {
1875 if (device->pi_capable) {
1876 isert_info("conn %p PI offload enabled\n", isert_conn);
1877 isert_conn->pi_support = true;
1878 return TARGET_PROT_ALL;
1882 isert_info("conn %p PI offload disabled\n", isert_conn);
1883 isert_conn->pi_support = false;
1885 return TARGET_PROT_NORMAL;
1889 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1890 bool nopout_response)
1892 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1893 struct isert_conn *isert_conn = conn->context;
1894 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1896 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1897 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1898 &isert_cmd->tx_desc.iscsi_header,
1900 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1901 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1903 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1905 return isert_post_response(isert_conn, isert_cmd);
1909 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1911 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1912 struct isert_conn *isert_conn = conn->context;
1913 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1915 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1916 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1917 &isert_cmd->tx_desc.iscsi_header);
1918 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1919 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1921 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1923 return isert_post_response(isert_conn, isert_cmd);
1927 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1929 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1930 struct isert_conn *isert_conn = conn->context;
1931 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1933 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1934 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1935 &isert_cmd->tx_desc.iscsi_header);
1936 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1937 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1939 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1941 return isert_post_response(isert_conn, isert_cmd);
1945 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1947 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1948 struct isert_conn *isert_conn = conn->context;
1949 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1950 struct isert_device *device = isert_conn->device;
1951 struct ib_device *ib_dev = device->ib_device;
1952 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1953 struct iscsi_reject *hdr =
1954 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1956 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1957 iscsit_build_reject(cmd, conn, hdr);
1958 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1960 hton24(hdr->dlength, ISCSI_HDR_LEN);
1961 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1962 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1964 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1965 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1966 tx_dsg->length = ISCSI_HDR_LEN;
1967 tx_dsg->lkey = device->pd->local_dma_lkey;
1968 isert_cmd->tx_desc.num_sge = 2;
1970 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1972 isert_dbg("conn %p Posting Reject\n", isert_conn);
1974 return isert_post_response(isert_conn, isert_cmd);
1978 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1981 struct isert_conn *isert_conn = conn->context;
1982 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1983 struct iscsi_text_rsp *hdr =
1984 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1988 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1989 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1994 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1997 struct isert_device *device = isert_conn->device;
1998 struct ib_device *ib_dev = device->ib_device;
1999 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2000 void *txt_rsp_buf = cmd->buf_ptr;
2002 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2003 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2005 isert_cmd->pdu_buf_len = txt_rsp_len;
2006 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2007 tx_dsg->length = txt_rsp_len;
2008 tx_dsg->lkey = device->pd->local_dma_lkey;
2009 isert_cmd->tx_desc.num_sge = 2;
2011 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2013 isert_dbg("conn %p Text Response\n", isert_conn);
2015 return isert_post_response(isert_conn, isert_cmd);
2019 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2020 struct ib_sig_domain *domain)
2022 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2023 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2024 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2025 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2027 * At the moment we hard code those, but if in the future
2028 * the target core would like to use it, we will take it
2031 domain->sig.dif.apptag_check_mask = 0xffff;
2032 domain->sig.dif.app_escape = true;
2033 domain->sig.dif.ref_escape = true;
2034 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2035 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2036 domain->sig.dif.ref_remap = true;
2040 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2042 memset(sig_attrs, 0, sizeof(*sig_attrs));
2044 switch (se_cmd->prot_op) {
2045 case TARGET_PROT_DIN_INSERT:
2046 case TARGET_PROT_DOUT_STRIP:
2047 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2048 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2050 case TARGET_PROT_DOUT_INSERT:
2051 case TARGET_PROT_DIN_STRIP:
2052 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2053 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2055 case TARGET_PROT_DIN_PASS:
2056 case TARGET_PROT_DOUT_PASS:
2057 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2058 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2061 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2065 sig_attrs->check_mask =
2066 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2067 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2068 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2073 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2074 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2076 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2077 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2078 u8 port_num = conn->cm_id->port_num;
2083 if (dir == DMA_FROM_DEVICE) {
2084 addr = cmd->write_va;
2085 rkey = cmd->write_stag;
2086 offset = cmd->iscsi_cmd->write_data_done;
2088 addr = cmd->read_va;
2089 rkey = cmd->read_stag;
2093 if (isert_prot_cmd(conn, se_cmd)) {
2094 struct ib_sig_attrs sig_attrs;
2096 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2100 WARN_ON_ONCE(offset);
2101 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2102 se_cmd->t_data_sg, se_cmd->t_data_nents,
2103 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2104 &sig_attrs, addr, rkey, dir);
2106 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2107 se_cmd->t_data_sg, se_cmd->t_data_nents,
2108 offset, addr, rkey, dir);
2111 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2115 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2117 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2122 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2124 struct se_cmd *se_cmd = &cmd->se_cmd;
2125 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2126 struct isert_conn *isert_conn = conn->context;
2127 struct ib_cqe *cqe = NULL;
2128 struct ib_send_wr *chain_wr = NULL;
2131 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2132 isert_cmd, se_cmd->data_length);
2134 if (isert_prot_cmd(isert_conn, se_cmd)) {
2135 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2136 cqe = &isert_cmd->tx_desc.tx_cqe;
2139 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2141 isert_create_send_desc(isert_conn, isert_cmd,
2142 &isert_cmd->tx_desc);
2143 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2144 &isert_cmd->tx_desc.iscsi_header);
2145 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2146 isert_init_send_wr(isert_conn, isert_cmd,
2147 &isert_cmd->tx_desc.send_wr);
2149 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2151 isert_err("ib_post_recv failed with %d\n", rc);
2155 chain_wr = &isert_cmd->tx_desc.send_wr;
2158 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2159 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2164 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2166 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2168 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2169 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2171 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2172 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2173 &isert_cmd->tx_desc.tx_cqe, NULL);
2175 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2181 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2183 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2188 spin_lock_bh(&conn->cmd_lock);
2189 list_del_init(&cmd->i_conn_node);
2190 spin_unlock_bh(&conn->cmd_lock);
2191 isert_put_cmd(isert_cmd, true);
2193 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2194 ret = isert_put_nopin(cmd, conn, false);
2197 isert_err("Unknown immediate state: 0x%02x\n", state);
2206 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2208 struct isert_conn *isert_conn = conn->context;
2212 case ISTATE_SEND_LOGOUTRSP:
2213 ret = isert_put_logout_rsp(cmd, conn);
2215 isert_conn->logout_posted = true;
2217 case ISTATE_SEND_NOPIN:
2218 ret = isert_put_nopin(cmd, conn, true);
2220 case ISTATE_SEND_TASKMGTRSP:
2221 ret = isert_put_tm_rsp(cmd, conn);
2223 case ISTATE_SEND_REJECT:
2224 ret = isert_put_reject(cmd, conn);
2226 case ISTATE_SEND_TEXTRSP:
2227 ret = isert_put_text_rsp(cmd, conn);
2229 case ISTATE_SEND_STATUS:
2231 * Special case for sending non GOOD SCSI status from TX thread
2232 * context during pre se_cmd excecution failure.
2234 ret = isert_put_response(conn, cmd);
2237 isert_err("Unknown response state: 0x%02x\n", state);
2246 isert_setup_id(struct isert_np *isert_np)
2248 struct iscsi_np *np = isert_np->np;
2249 struct rdma_cm_id *id;
2250 struct sockaddr *sa;
2253 sa = (struct sockaddr *)&np->np_sockaddr;
2254 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2256 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2257 RDMA_PS_TCP, IB_QPT_RC);
2259 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2263 isert_dbg("id %p context %p\n", id, id->context);
2265 ret = rdma_bind_addr(id, sa);
2267 isert_err("rdma_bind_addr() failed: %d\n", ret);
2271 ret = rdma_listen(id, 0);
2273 isert_err("rdma_listen() failed: %d\n", ret);
2279 rdma_destroy_id(id);
2281 return ERR_PTR(ret);
2285 isert_setup_np(struct iscsi_np *np,
2286 struct sockaddr_storage *ksockaddr)
2288 struct isert_np *isert_np;
2289 struct rdma_cm_id *isert_lid;
2292 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2294 isert_err("Unable to allocate struct isert_np\n");
2297 sema_init(&isert_np->sem, 0);
2298 mutex_init(&isert_np->mutex);
2299 INIT_LIST_HEAD(&isert_np->accepted);
2300 INIT_LIST_HEAD(&isert_np->pending);
2304 * Setup the np->np_sockaddr from the passed sockaddr setup
2305 * in iscsi_target_configfs.c code..
2307 memcpy(&np->np_sockaddr, ksockaddr,
2308 sizeof(struct sockaddr_storage));
2310 isert_lid = isert_setup_id(isert_np);
2311 if (IS_ERR(isert_lid)) {
2312 ret = PTR_ERR(isert_lid);
2316 isert_np->cm_id = isert_lid;
2317 np->np_context = isert_np;
2328 isert_rdma_accept(struct isert_conn *isert_conn)
2330 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2331 struct rdma_conn_param cp;
2333 struct iser_cm_hdr rsp_hdr;
2335 memset(&cp, 0, sizeof(struct rdma_conn_param));
2336 cp.initiator_depth = isert_conn->initiator_depth;
2338 cp.rnr_retry_count = 7;
2340 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2341 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2342 if (!isert_conn->snd_w_inv)
2343 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2344 cp.private_data = (void *)&rsp_hdr;
2345 cp.private_data_len = sizeof(rsp_hdr);
2347 ret = rdma_accept(cm_id, &cp);
2349 isert_err("rdma_accept() failed with: %d\n", ret);
2357 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2359 struct isert_conn *isert_conn = conn->context;
2362 isert_info("before login_req comp conn: %p\n", isert_conn);
2363 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2365 isert_err("isert_conn %p interrupted before got login req\n",
2369 reinit_completion(&isert_conn->login_req_comp);
2372 * For login requests after the first PDU, isert_rx_login_req() will
2373 * kick schedule_delayed_work(&conn->login_work) as the packet is
2374 * received, which turns this callback from iscsi_target_do_login_rx()
2377 if (!login->first_request)
2380 isert_rx_login_req(isert_conn);
2382 isert_info("before login_comp conn: %p\n", conn);
2383 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2387 isert_info("processing login->req: %p\n", login->req);
2393 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2394 struct isert_conn *isert_conn)
2396 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2397 struct rdma_route *cm_route = &cm_id->route;
2399 conn->login_family = np->np_sockaddr.ss_family;
2401 conn->login_sockaddr = cm_route->addr.dst_addr;
2402 conn->local_sockaddr = cm_route->addr.src_addr;
2406 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2408 struct isert_np *isert_np = np->np_context;
2409 struct isert_conn *isert_conn;
2413 ret = down_interruptible(&isert_np->sem);
2417 spin_lock_bh(&np->np_thread_lock);
2418 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2419 spin_unlock_bh(&np->np_thread_lock);
2420 isert_dbg("np_thread_state %d\n",
2421 np->np_thread_state);
2423 * No point in stalling here when np_thread
2424 * is in state RESET/SHUTDOWN/EXIT - bail
2428 spin_unlock_bh(&np->np_thread_lock);
2430 mutex_lock(&isert_np->mutex);
2431 if (list_empty(&isert_np->pending)) {
2432 mutex_unlock(&isert_np->mutex);
2435 isert_conn = list_first_entry(&isert_np->pending,
2436 struct isert_conn, node);
2437 list_del_init(&isert_conn->node);
2438 mutex_unlock(&isert_np->mutex);
2440 conn->context = isert_conn;
2441 isert_conn->conn = conn;
2442 isert_conn->state = ISER_CONN_BOUND;
2444 isert_set_conn_info(np, conn, isert_conn);
2446 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2452 isert_free_np(struct iscsi_np *np)
2454 struct isert_np *isert_np = np->np_context;
2455 struct isert_conn *isert_conn, *n;
2457 if (isert_np->cm_id)
2458 rdma_destroy_id(isert_np->cm_id);
2461 * FIXME: At this point we don't have a good way to insure
2462 * that at this point we don't have hanging connections that
2463 * completed RDMA establishment but didn't start iscsi login
2464 * process. So work-around this by cleaning up what ever piled
2465 * up in accepted and pending lists.
2467 mutex_lock(&isert_np->mutex);
2468 if (!list_empty(&isert_np->pending)) {
2469 isert_info("Still have isert pending connections\n");
2470 list_for_each_entry_safe(isert_conn, n,
2473 isert_info("cleaning isert_conn %p state (%d)\n",
2474 isert_conn, isert_conn->state);
2475 isert_connect_release(isert_conn);
2479 if (!list_empty(&isert_np->accepted)) {
2480 isert_info("Still have isert accepted connections\n");
2481 list_for_each_entry_safe(isert_conn, n,
2482 &isert_np->accepted,
2484 isert_info("cleaning isert_conn %p state (%d)\n",
2485 isert_conn, isert_conn->state);
2486 isert_connect_release(isert_conn);
2489 mutex_unlock(&isert_np->mutex);
2491 np->np_context = NULL;
2495 static void isert_release_work(struct work_struct *work)
2497 struct isert_conn *isert_conn = container_of(work,
2501 isert_info("Starting release conn %p\n", isert_conn);
2503 mutex_lock(&isert_conn->mutex);
2504 isert_conn->state = ISER_CONN_DOWN;
2505 mutex_unlock(&isert_conn->mutex);
2507 isert_info("Destroying conn %p\n", isert_conn);
2508 isert_put_conn(isert_conn);
2512 isert_wait4logout(struct isert_conn *isert_conn)
2514 struct iscsi_conn *conn = isert_conn->conn;
2516 isert_info("conn %p\n", isert_conn);
2518 if (isert_conn->logout_posted) {
2519 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2520 wait_for_completion_timeout(&conn->conn_logout_comp,
2521 SECONDS_FOR_LOGOUT_COMP * HZ);
2526 isert_wait4cmds(struct iscsi_conn *conn)
2528 isert_info("iscsi_conn %p\n", conn);
2531 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2532 target_wait_for_sess_cmds(conn->sess->se_sess);
2537 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2538 * unsolicitate dataout
2539 * @conn: iscsi connection
2541 * We might still have commands that are waiting for unsolicited
2542 * dataouts messages. We must put the extra reference on those
2543 * before blocking on the target_wait_for_session_cmds
2546 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2548 struct iscsi_cmd *cmd, *tmp;
2549 static LIST_HEAD(drop_cmd_list);
2551 spin_lock_bh(&conn->cmd_lock);
2552 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2553 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2554 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2555 (cmd->write_data_done < cmd->se_cmd.data_length))
2556 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2558 spin_unlock_bh(&conn->cmd_lock);
2560 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2561 list_del_init(&cmd->i_conn_node);
2562 if (cmd->i_state != ISTATE_REMOVE) {
2563 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2565 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2566 isert_put_cmd(isert_cmd, true);
2571 static void isert_wait_conn(struct iscsi_conn *conn)
2573 struct isert_conn *isert_conn = conn->context;
2575 isert_info("Starting conn %p\n", isert_conn);
2577 mutex_lock(&isert_conn->mutex);
2578 isert_conn_terminate(isert_conn);
2579 mutex_unlock(&isert_conn->mutex);
2581 ib_drain_qp(isert_conn->qp);
2582 isert_put_unsol_pending_cmds(conn);
2583 isert_wait4cmds(conn);
2584 isert_wait4logout(isert_conn);
2586 queue_work(isert_release_wq, &isert_conn->release_work);
2589 static void isert_free_conn(struct iscsi_conn *conn)
2591 struct isert_conn *isert_conn = conn->context;
2593 ib_drain_qp(isert_conn->qp);
2594 isert_put_conn(isert_conn);
2597 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2599 struct completion comp;
2601 init_completion(&comp);
2603 wait_for_completion_interruptible(&comp);
2606 static struct iscsit_transport iser_target_transport = {
2608 .transport_type = ISCSI_INFINIBAND,
2609 .rdma_shutdown = true,
2610 .priv_size = sizeof(struct isert_cmd),
2611 .owner = THIS_MODULE,
2612 .iscsit_setup_np = isert_setup_np,
2613 .iscsit_accept_np = isert_accept_np,
2614 .iscsit_free_np = isert_free_np,
2615 .iscsit_wait_conn = isert_wait_conn,
2616 .iscsit_free_conn = isert_free_conn,
2617 .iscsit_get_login_rx = isert_get_login_rx,
2618 .iscsit_put_login_tx = isert_put_login_tx,
2619 .iscsit_immediate_queue = isert_immediate_queue,
2620 .iscsit_response_queue = isert_response_queue,
2621 .iscsit_get_dataout = isert_get_dataout,
2622 .iscsit_queue_data_in = isert_put_datain,
2623 .iscsit_queue_status = isert_put_response,
2624 .iscsit_aborted_task = isert_aborted_task,
2625 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2626 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2629 static int __init isert_init(void)
2633 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2634 WQ_UNBOUND | WQ_HIGHPRI, 0);
2635 if (!isert_comp_wq) {
2636 isert_err("Unable to allocate isert_comp_wq\n");
2641 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2642 WQ_UNBOUND_MAX_ACTIVE);
2643 if (!isert_release_wq) {
2644 isert_err("Unable to allocate isert_release_wq\n");
2646 goto destroy_comp_wq;
2649 iscsit_register_transport(&iser_target_transport);
2650 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2655 destroy_workqueue(isert_comp_wq);
2660 static void __exit isert_exit(void)
2662 flush_scheduled_work();
2663 destroy_workqueue(isert_release_wq);
2664 destroy_workqueue(isert_comp_wq);
2665 iscsit_unregister_transport(&iser_target_transport);
2666 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2669 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2670 MODULE_VERSION("1.0");
2671 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2672 MODULE_LICENSE("GPL");
2674 module_init(isert_init);
2675 module_exit(isert_exit);