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 isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
141 device->ib_device->attrs.max_sge_rd);
142 attr.cap.max_recv_sge = 1;
143 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
144 attr.qp_type = IB_QPT_RC;
145 if (device->pi_capable)
146 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
148 ret = rdma_create_qp(cma_id, device->pd, &attr);
150 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
158 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
160 struct isert_comp *comp;
163 comp = isert_comp_get(isert_conn);
164 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
165 if (IS_ERR(isert_conn->qp)) {
166 ret = PTR_ERR(isert_conn->qp);
172 isert_comp_put(comp);
177 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
179 struct isert_device *device = isert_conn->device;
180 struct ib_device *ib_dev = device->ib_device;
181 struct iser_rx_desc *rx_desc;
182 struct ib_sge *rx_sg;
186 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
187 sizeof(struct iser_rx_desc), GFP_KERNEL);
188 if (!isert_conn->rx_descs)
191 rx_desc = isert_conn->rx_descs;
193 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
194 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
195 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
196 if (ib_dma_mapping_error(ib_dev, dma_addr))
199 rx_desc->dma_addr = dma_addr;
201 rx_sg = &rx_desc->rx_sg;
202 rx_sg->addr = rx_desc->dma_addr;
203 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
204 rx_sg->lkey = device->pd->local_dma_lkey;
205 rx_desc->rx_cqe.done = isert_recv_done;
211 rx_desc = isert_conn->rx_descs;
212 for (j = 0; j < i; j++, rx_desc++) {
213 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
214 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
216 kfree(isert_conn->rx_descs);
217 isert_conn->rx_descs = NULL;
219 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
225 isert_free_rx_descriptors(struct isert_conn *isert_conn)
227 struct ib_device *ib_dev = isert_conn->device->ib_device;
228 struct iser_rx_desc *rx_desc;
231 if (!isert_conn->rx_descs)
234 rx_desc = isert_conn->rx_descs;
235 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
236 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
237 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
240 kfree(isert_conn->rx_descs);
241 isert_conn->rx_descs = NULL;
245 isert_free_comps(struct isert_device *device)
249 for (i = 0; i < device->comps_used; i++) {
250 struct isert_comp *comp = &device->comps[i];
253 ib_free_cq(comp->cq);
255 kfree(device->comps);
259 isert_alloc_comps(struct isert_device *device)
261 int i, max_cqe, ret = 0;
263 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
264 device->ib_device->num_comp_vectors));
266 isert_info("Using %d CQs, %s supports %d vectors support "
268 device->comps_used, device->ib_device->name,
269 device->ib_device->num_comp_vectors,
272 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
274 if (!device->comps) {
275 isert_err("Unable to allocate completion contexts\n");
279 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
281 for (i = 0; i < device->comps_used; i++) {
282 struct isert_comp *comp = &device->comps[i];
284 comp->device = device;
285 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
287 if (IS_ERR(comp->cq)) {
288 isert_err("Unable to allocate cq\n");
289 ret = PTR_ERR(comp->cq);
297 isert_free_comps(device);
302 isert_create_device_ib_res(struct isert_device *device)
304 struct ib_device *ib_dev = device->ib_device;
307 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
308 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
310 ret = isert_alloc_comps(device);
314 device->pd = ib_alloc_pd(ib_dev);
315 if (IS_ERR(device->pd)) {
316 ret = PTR_ERR(device->pd);
317 isert_err("failed to allocate pd, device %p, ret=%d\n",
322 /* Check signature cap */
323 device->pi_capable = ib_dev->attrs.device_cap_flags &
324 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
329 isert_free_comps(device);
337 isert_free_device_ib_res(struct isert_device *device)
339 isert_info("device %p\n", device);
341 ib_dealloc_pd(device->pd);
342 isert_free_comps(device);
346 isert_device_put(struct isert_device *device)
348 mutex_lock(&device_list_mutex);
350 isert_info("device %p refcount %d\n", device, device->refcount);
351 if (!device->refcount) {
352 isert_free_device_ib_res(device);
353 list_del(&device->dev_node);
356 mutex_unlock(&device_list_mutex);
359 static struct isert_device *
360 isert_device_get(struct rdma_cm_id *cma_id)
362 struct isert_device *device;
365 mutex_lock(&device_list_mutex);
366 list_for_each_entry(device, &device_list, dev_node) {
367 if (device->ib_device->node_guid == cma_id->device->node_guid) {
369 isert_info("Found iser device %p refcount %d\n",
370 device, device->refcount);
371 mutex_unlock(&device_list_mutex);
376 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
378 mutex_unlock(&device_list_mutex);
379 return ERR_PTR(-ENOMEM);
382 INIT_LIST_HEAD(&device->dev_node);
384 device->ib_device = cma_id->device;
385 ret = isert_create_device_ib_res(device);
388 mutex_unlock(&device_list_mutex);
393 list_add_tail(&device->dev_node, &device_list);
394 isert_info("Created a new iser device %p refcount %d\n",
395 device, device->refcount);
396 mutex_unlock(&device_list_mutex);
402 isert_init_conn(struct isert_conn *isert_conn)
404 isert_conn->state = ISER_CONN_INIT;
405 INIT_LIST_HEAD(&isert_conn->node);
406 init_completion(&isert_conn->login_comp);
407 init_completion(&isert_conn->login_req_comp);
408 kref_init(&isert_conn->kref);
409 mutex_init(&isert_conn->mutex);
410 INIT_WORK(&isert_conn->release_work, isert_release_work);
414 isert_free_login_buf(struct isert_conn *isert_conn)
416 struct ib_device *ib_dev = isert_conn->device->ib_device;
418 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
419 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
420 kfree(isert_conn->login_rsp_buf);
422 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
423 ISER_RX_PAYLOAD_SIZE,
425 kfree(isert_conn->login_req_buf);
429 isert_alloc_login_buf(struct isert_conn *isert_conn,
430 struct ib_device *ib_dev)
434 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
436 if (!isert_conn->login_req_buf) {
437 isert_err("Unable to allocate isert_conn->login_buf\n");
441 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
442 isert_conn->login_req_buf,
443 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
444 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
446 isert_err("login_req_dma mapping error: %d\n", ret);
447 isert_conn->login_req_dma = 0;
448 goto out_free_login_req_buf;
451 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
452 if (!isert_conn->login_rsp_buf) {
453 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
454 goto out_unmap_login_req_buf;
457 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
458 isert_conn->login_rsp_buf,
459 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
460 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
462 isert_err("login_rsp_dma mapping error: %d\n", ret);
463 isert_conn->login_rsp_dma = 0;
464 goto out_free_login_rsp_buf;
469 out_free_login_rsp_buf:
470 kfree(isert_conn->login_rsp_buf);
471 out_unmap_login_req_buf:
472 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
473 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
474 out_free_login_req_buf:
475 kfree(isert_conn->login_req_buf);
480 isert_set_nego_params(struct isert_conn *isert_conn,
481 struct rdma_conn_param *param)
483 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
485 /* Set max inflight RDMA READ requests */
486 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
487 attr->max_qp_init_rd_atom);
488 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
490 if (param->private_data) {
491 u8 flags = *(u8 *)param->private_data;
494 * use remote invalidation if the both initiator
495 * and the HCA support it
497 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
498 (attr->device_cap_flags &
499 IB_DEVICE_MEM_MGT_EXTENSIONS);
500 if (isert_conn->snd_w_inv)
501 isert_info("Using remote invalidation\n");
506 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
508 struct isert_np *isert_np = cma_id->context;
509 struct iscsi_np *np = isert_np->np;
510 struct isert_conn *isert_conn;
511 struct isert_device *device;
514 spin_lock_bh(&np->np_thread_lock);
516 spin_unlock_bh(&np->np_thread_lock);
517 isert_dbg("iscsi_np is not enabled, reject connect request\n");
518 return rdma_reject(cma_id, NULL, 0);
520 spin_unlock_bh(&np->np_thread_lock);
522 isert_dbg("cma_id: %p, portal: %p\n",
523 cma_id, cma_id->context);
525 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
529 isert_init_conn(isert_conn);
530 isert_conn->cm_id = cma_id;
532 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
536 device = isert_device_get(cma_id);
537 if (IS_ERR(device)) {
538 ret = PTR_ERR(device);
539 goto out_rsp_dma_map;
541 isert_conn->device = device;
543 isert_set_nego_params(isert_conn, &event->param.conn);
545 ret = isert_conn_setup_qp(isert_conn, cma_id);
549 ret = isert_login_post_recv(isert_conn);
553 ret = isert_rdma_accept(isert_conn);
557 mutex_lock(&isert_np->mutex);
558 list_add_tail(&isert_conn->node, &isert_np->accepted);
559 mutex_unlock(&isert_np->mutex);
564 isert_device_put(device);
566 isert_free_login_buf(isert_conn);
569 rdma_reject(cma_id, NULL, 0);
574 isert_connect_release(struct isert_conn *isert_conn)
576 struct isert_device *device = isert_conn->device;
578 isert_dbg("conn %p\n", isert_conn);
582 isert_free_rx_descriptors(isert_conn);
583 if (isert_conn->cm_id)
584 rdma_destroy_id(isert_conn->cm_id);
586 if (isert_conn->qp) {
587 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
589 isert_comp_put(comp);
590 ib_destroy_qp(isert_conn->qp);
593 if (isert_conn->login_req_buf)
594 isert_free_login_buf(isert_conn);
596 isert_device_put(device);
602 isert_connected_handler(struct rdma_cm_id *cma_id)
604 struct isert_conn *isert_conn = cma_id->qp->qp_context;
605 struct isert_np *isert_np = cma_id->context;
607 isert_info("conn %p\n", isert_conn);
609 mutex_lock(&isert_conn->mutex);
610 isert_conn->state = ISER_CONN_UP;
611 kref_get(&isert_conn->kref);
612 mutex_unlock(&isert_conn->mutex);
614 mutex_lock(&isert_np->mutex);
615 list_move_tail(&isert_conn->node, &isert_np->pending);
616 mutex_unlock(&isert_np->mutex);
618 isert_info("np %p: Allow accept_np to continue\n", isert_np);
623 isert_release_kref(struct kref *kref)
625 struct isert_conn *isert_conn = container_of(kref,
626 struct isert_conn, kref);
628 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
631 isert_connect_release(isert_conn);
635 isert_put_conn(struct isert_conn *isert_conn)
637 kref_put(&isert_conn->kref, isert_release_kref);
641 isert_handle_unbound_conn(struct isert_conn *isert_conn)
643 struct isert_np *isert_np = isert_conn->cm_id->context;
645 mutex_lock(&isert_np->mutex);
646 if (!list_empty(&isert_conn->node)) {
648 * This means iscsi doesn't know this connection
649 * so schedule a cleanup ourselves
651 list_del_init(&isert_conn->node);
652 isert_put_conn(isert_conn);
653 queue_work(isert_release_wq, &isert_conn->release_work);
655 mutex_unlock(&isert_np->mutex);
659 * isert_conn_terminate() - Initiate connection termination
660 * @isert_conn: isert connection struct
663 * In case the connection state is BOUND, move state
664 * to TEMINATING and start teardown sequence (rdma_disconnect).
665 * In case the connection state is UP, complete flush as well.
667 * This routine must be called with mutex held. Thus it is
668 * safe to call multiple times.
671 isert_conn_terminate(struct isert_conn *isert_conn)
675 if (isert_conn->state >= ISER_CONN_TERMINATING)
678 isert_info("Terminating conn %p state %d\n",
679 isert_conn, isert_conn->state);
680 isert_conn->state = ISER_CONN_TERMINATING;
681 err = rdma_disconnect(isert_conn->cm_id);
683 isert_warn("Failed rdma_disconnect isert_conn %p\n",
688 isert_np_cma_handler(struct isert_np *isert_np,
689 enum rdma_cm_event_type event)
691 isert_dbg("%s (%d): isert np %p\n",
692 rdma_event_msg(event), event, isert_np);
695 case RDMA_CM_EVENT_DEVICE_REMOVAL:
696 isert_np->cm_id = NULL;
698 case RDMA_CM_EVENT_ADDR_CHANGE:
699 isert_np->cm_id = isert_setup_id(isert_np);
700 if (IS_ERR(isert_np->cm_id)) {
701 isert_err("isert np %p setup id failed: %ld\n",
702 isert_np, PTR_ERR(isert_np->cm_id));
703 isert_np->cm_id = NULL;
707 isert_err("isert np %p Unexpected event %d\n",
715 isert_disconnected_handler(struct rdma_cm_id *cma_id,
716 enum rdma_cm_event_type event)
718 struct isert_conn *isert_conn = cma_id->qp->qp_context;
720 mutex_lock(&isert_conn->mutex);
721 switch (isert_conn->state) {
722 case ISER_CONN_TERMINATING:
725 isert_conn_terminate(isert_conn);
726 ib_drain_qp(isert_conn->qp);
727 isert_handle_unbound_conn(isert_conn);
729 case ISER_CONN_BOUND:
730 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
731 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
734 isert_warn("conn %p teminating in state %d\n",
735 isert_conn, isert_conn->state);
737 mutex_unlock(&isert_conn->mutex);
743 isert_connect_error(struct rdma_cm_id *cma_id)
745 struct isert_conn *isert_conn = cma_id->qp->qp_context;
747 list_del_init(&isert_conn->node);
748 isert_conn->cm_id = NULL;
749 isert_put_conn(isert_conn);
755 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
757 struct isert_np *isert_np = cma_id->context;
760 isert_info("%s (%d): status %d id %p np %p\n",
761 rdma_event_msg(event->event), event->event,
762 event->status, cma_id, cma_id->context);
764 if (isert_np->cm_id == cma_id)
765 return isert_np_cma_handler(cma_id->context, event->event);
767 switch (event->event) {
768 case RDMA_CM_EVENT_CONNECT_REQUEST:
769 ret = isert_connect_request(cma_id, event);
771 isert_err("failed handle connect request %d\n", ret);
773 case RDMA_CM_EVENT_ESTABLISHED:
774 isert_connected_handler(cma_id);
776 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
777 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
778 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
779 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
780 ret = isert_disconnected_handler(cma_id, event->event);
782 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
783 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
784 case RDMA_CM_EVENT_CONNECT_ERROR:
785 ret = isert_connect_error(cma_id);
788 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
796 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
798 struct ib_recv_wr *rx_wr, *rx_wr_failed;
800 struct iser_rx_desc *rx_desc;
802 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
803 rx_desc = &isert_conn->rx_descs[i];
805 rx_wr->wr_cqe = &rx_desc->rx_cqe;
806 rx_wr->sg_list = &rx_desc->rx_sg;
808 rx_wr->next = rx_wr + 1;
811 rx_wr->next = NULL; /* mark end of work requests list */
813 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
816 isert_err("ib_post_recv() failed with ret: %d\n", ret);
822 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
824 struct ib_recv_wr *rx_wr_failed, rx_wr;
827 rx_wr.wr_cqe = &rx_desc->rx_cqe;
828 rx_wr.sg_list = &rx_desc->rx_sg;
832 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
834 isert_err("ib_post_recv() failed with ret: %d\n", ret);
840 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
842 struct ib_device *ib_dev = isert_conn->cm_id->device;
843 struct ib_send_wr send_wr, *send_wr_failed;
846 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
847 ISER_HEADERS_LEN, DMA_TO_DEVICE);
849 tx_desc->tx_cqe.done = isert_login_send_done;
852 send_wr.wr_cqe = &tx_desc->tx_cqe;
853 send_wr.sg_list = tx_desc->tx_sg;
854 send_wr.num_sge = tx_desc->num_sge;
855 send_wr.opcode = IB_WR_SEND;
856 send_wr.send_flags = IB_SEND_SIGNALED;
858 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
860 isert_err("ib_post_send() failed, ret: %d\n", ret);
866 isert_create_send_desc(struct isert_conn *isert_conn,
867 struct isert_cmd *isert_cmd,
868 struct iser_tx_desc *tx_desc)
870 struct isert_device *device = isert_conn->device;
871 struct ib_device *ib_dev = device->ib_device;
873 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
874 ISER_HEADERS_LEN, DMA_TO_DEVICE);
876 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
877 tx_desc->iser_header.flags = ISCSI_CTRL;
879 tx_desc->num_sge = 1;
881 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
882 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
883 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
888 isert_init_tx_hdrs(struct isert_conn *isert_conn,
889 struct iser_tx_desc *tx_desc)
891 struct isert_device *device = isert_conn->device;
892 struct ib_device *ib_dev = device->ib_device;
895 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
896 ISER_HEADERS_LEN, DMA_TO_DEVICE);
897 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
898 isert_err("ib_dma_mapping_error() failed\n");
902 tx_desc->dma_addr = dma_addr;
903 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
904 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
905 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
907 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
908 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
909 tx_desc->tx_sg[0].lkey);
915 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
916 struct ib_send_wr *send_wr)
918 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
920 tx_desc->tx_cqe.done = isert_send_done;
921 send_wr->wr_cqe = &tx_desc->tx_cqe;
923 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
924 send_wr->opcode = IB_WR_SEND_WITH_INV;
925 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
927 send_wr->opcode = IB_WR_SEND;
930 send_wr->sg_list = &tx_desc->tx_sg[0];
931 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
932 send_wr->send_flags = IB_SEND_SIGNALED;
936 isert_login_post_recv(struct isert_conn *isert_conn)
938 struct ib_recv_wr rx_wr, *rx_wr_fail;
942 memset(&sge, 0, sizeof(struct ib_sge));
943 sge.addr = isert_conn->login_req_dma;
944 sge.length = ISER_RX_PAYLOAD_SIZE;
945 sge.lkey = isert_conn->device->pd->local_dma_lkey;
947 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
948 sge.addr, sge.length, sge.lkey);
950 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
952 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
953 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
954 rx_wr.sg_list = &sge;
957 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
959 isert_err("ib_post_recv() failed: %d\n", ret);
965 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
968 struct isert_conn *isert_conn = conn->context;
969 struct isert_device *device = isert_conn->device;
970 struct ib_device *ib_dev = device->ib_device;
971 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
974 isert_create_send_desc(isert_conn, NULL, tx_desc);
976 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
977 sizeof(struct iscsi_hdr));
979 isert_init_tx_hdrs(isert_conn, tx_desc);
982 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
984 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
985 length, DMA_TO_DEVICE);
987 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
989 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
990 length, DMA_TO_DEVICE);
992 tx_dsg->addr = isert_conn->login_rsp_dma;
993 tx_dsg->length = length;
994 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
995 tx_desc->num_sge = 2;
997 if (!login->login_failed) {
998 if (login->login_complete) {
999 ret = isert_alloc_rx_descriptors(isert_conn);
1003 ret = isert_post_recvm(isert_conn,
1004 ISERT_QP_MAX_RECV_DTOS);
1008 /* Now we are in FULL_FEATURE phase */
1009 mutex_lock(&isert_conn->mutex);
1010 isert_conn->state = ISER_CONN_FULL_FEATURE;
1011 mutex_unlock(&isert_conn->mutex);
1015 ret = isert_login_post_recv(isert_conn);
1020 ret = isert_login_post_send(isert_conn, tx_desc);
1028 isert_rx_login_req(struct isert_conn *isert_conn)
1030 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1031 int rx_buflen = isert_conn->login_req_len;
1032 struct iscsi_conn *conn = isert_conn->conn;
1033 struct iscsi_login *login = conn->conn_login;
1036 isert_info("conn %p\n", isert_conn);
1038 WARN_ON_ONCE(!login);
1040 if (login->first_request) {
1041 struct iscsi_login_req *login_req =
1042 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1044 * Setup the initial iscsi_login values from the leading
1045 * login request PDU.
1047 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1048 login->current_stage =
1049 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1051 login->version_min = login_req->min_version;
1052 login->version_max = login_req->max_version;
1053 memcpy(login->isid, login_req->isid, 6);
1054 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1055 login->init_task_tag = login_req->itt;
1056 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1057 login->cid = be16_to_cpu(login_req->cid);
1058 login->tsih = be16_to_cpu(login_req->tsih);
1061 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1063 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1064 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1065 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1066 MAX_KEY_VALUE_PAIRS);
1067 memcpy(login->req_buf, &rx_desc->data[0], size);
1069 if (login->first_request) {
1070 complete(&isert_conn->login_comp);
1073 schedule_delayed_work(&conn->login_work, 0);
1076 static struct iscsi_cmd
1077 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1079 struct isert_conn *isert_conn = conn->context;
1080 struct isert_cmd *isert_cmd;
1081 struct iscsi_cmd *cmd;
1083 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1085 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1088 isert_cmd = iscsit_priv_cmd(cmd);
1089 isert_cmd->conn = isert_conn;
1090 isert_cmd->iscsi_cmd = cmd;
1091 isert_cmd->rx_desc = rx_desc;
1097 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1098 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1099 struct iser_rx_desc *rx_desc, unsigned char *buf)
1101 struct iscsi_conn *conn = isert_conn->conn;
1102 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1103 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1104 bool dump_payload = false;
1105 unsigned int data_len;
1107 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1111 imm_data = cmd->immediate_data;
1112 imm_data_len = cmd->first_burst_len;
1113 unsol_data = cmd->unsolicited_data;
1114 data_len = cmd->se_cmd.data_length;
1116 if (imm_data && imm_data_len == data_len)
1117 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1118 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1121 } else if (rc > 0) {
1122 dump_payload = true;
1129 if (imm_data_len != data_len) {
1130 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1131 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1132 &rx_desc->data[0], imm_data_len);
1133 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1134 sg_nents, imm_data_len);
1136 sg_init_table(&isert_cmd->sg, 1);
1137 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1138 cmd->se_cmd.t_data_nents = 1;
1139 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1140 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1144 cmd->write_data_done += imm_data_len;
1146 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1147 spin_lock_bh(&cmd->istate_lock);
1148 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1149 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1150 spin_unlock_bh(&cmd->istate_lock);
1154 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1156 if (!rc && dump_payload == false && unsol_data)
1157 iscsit_set_unsoliticed_dataout(cmd);
1158 else if (dump_payload && imm_data)
1159 target_put_sess_cmd(&cmd->se_cmd);
1165 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1166 struct iser_rx_desc *rx_desc, unsigned char *buf)
1168 struct scatterlist *sg_start;
1169 struct iscsi_conn *conn = isert_conn->conn;
1170 struct iscsi_cmd *cmd = NULL;
1171 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1172 u32 unsol_data_len = ntoh24(hdr->dlength);
1173 int rc, sg_nents, sg_off, page_off;
1175 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1181 * FIXME: Unexpected unsolicited_data out
1183 if (!cmd->unsolicited_data) {
1184 isert_err("Received unexpected solicited data payload\n");
1189 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1190 "write_data_done: %u, data_length: %u\n",
1191 unsol_data_len, cmd->write_data_done,
1192 cmd->se_cmd.data_length);
1194 sg_off = cmd->write_data_done / PAGE_SIZE;
1195 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1196 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1197 page_off = cmd->write_data_done % PAGE_SIZE;
1199 * FIXME: Non page-aligned unsolicited_data out
1202 isert_err("unexpected non-page aligned data payload\n");
1206 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1207 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1208 sg_nents, &rx_desc->data[0], unsol_data_len);
1210 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1213 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1218 * multiple data-outs on the same command can arrive -
1219 * so post the buffer before hand
1221 rc = isert_post_recv(isert_conn, rx_desc);
1223 isert_err("ib_post_recv failed with %d\n", rc);
1230 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1231 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1234 struct iscsi_conn *conn = isert_conn->conn;
1235 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1238 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1242 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1245 return iscsit_process_nop_out(conn, cmd, hdr);
1249 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1250 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1251 struct iscsi_text *hdr)
1253 struct iscsi_conn *conn = isert_conn->conn;
1254 u32 payload_length = ntoh24(hdr->dlength);
1256 unsigned char *text_in = NULL;
1258 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1262 if (payload_length) {
1263 text_in = kzalloc(payload_length, GFP_KERNEL);
1265 isert_err("Unable to allocate text_in of payload_length: %u\n",
1270 cmd->text_in_ptr = text_in;
1272 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1274 return iscsit_process_text_cmd(conn, cmd, hdr);
1278 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1279 uint32_t read_stag, uint64_t read_va,
1280 uint32_t write_stag, uint64_t write_va)
1282 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1283 struct iscsi_conn *conn = isert_conn->conn;
1284 struct iscsi_cmd *cmd;
1285 struct isert_cmd *isert_cmd;
1287 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1289 if (conn->sess->sess_ops->SessionType &&
1290 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1291 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1292 " ignoring\n", opcode);
1297 case ISCSI_OP_SCSI_CMD:
1298 cmd = isert_allocate_cmd(conn, rx_desc);
1302 isert_cmd = iscsit_priv_cmd(cmd);
1303 isert_cmd->read_stag = read_stag;
1304 isert_cmd->read_va = read_va;
1305 isert_cmd->write_stag = write_stag;
1306 isert_cmd->write_va = write_va;
1307 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1309 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1310 rx_desc, (unsigned char *)hdr);
1312 case ISCSI_OP_NOOP_OUT:
1313 cmd = isert_allocate_cmd(conn, rx_desc);
1317 isert_cmd = iscsit_priv_cmd(cmd);
1318 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1319 rx_desc, (unsigned char *)hdr);
1321 case ISCSI_OP_SCSI_DATA_OUT:
1322 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1323 (unsigned char *)hdr);
1325 case ISCSI_OP_SCSI_TMFUNC:
1326 cmd = isert_allocate_cmd(conn, rx_desc);
1330 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1331 (unsigned char *)hdr);
1333 case ISCSI_OP_LOGOUT:
1334 cmd = isert_allocate_cmd(conn, rx_desc);
1338 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1341 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1342 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1344 cmd = isert_allocate_cmd(conn, rx_desc);
1349 isert_cmd = iscsit_priv_cmd(cmd);
1350 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1351 rx_desc, (struct iscsi_text *)hdr);
1354 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1363 isert_print_wc(struct ib_wc *wc, const char *type)
1365 if (wc->status != IB_WC_WR_FLUSH_ERR)
1366 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1367 ib_wc_status_msg(wc->status), wc->status,
1370 isert_dbg("%s failure: %s (%d)\n", type,
1371 ib_wc_status_msg(wc->status), wc->status);
1375 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1377 struct isert_conn *isert_conn = wc->qp->qp_context;
1378 struct ib_device *ib_dev = isert_conn->cm_id->device;
1379 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1380 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1381 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1382 uint64_t read_va = 0, write_va = 0;
1383 uint32_t read_stag = 0, write_stag = 0;
1385 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1386 isert_print_wc(wc, "recv");
1387 if (wc->status != IB_WC_WR_FLUSH_ERR)
1388 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1392 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1393 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1395 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1396 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1397 (int)(wc->byte_len - ISER_HEADERS_LEN));
1399 switch (iser_ctrl->flags & 0xF0) {
1401 if (iser_ctrl->flags & ISER_RSV) {
1402 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1403 read_va = be64_to_cpu(iser_ctrl->read_va);
1404 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1405 read_stag, (unsigned long long)read_va);
1407 if (iser_ctrl->flags & ISER_WSV) {
1408 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1409 write_va = be64_to_cpu(iser_ctrl->write_va);
1410 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1411 write_stag, (unsigned long long)write_va);
1414 isert_dbg("ISER ISCSI_CTRL PDU\n");
1417 isert_err("iSER Hello message\n");
1420 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1424 isert_rx_opcode(isert_conn, rx_desc,
1425 read_stag, read_va, write_stag, write_va);
1427 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1428 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1432 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1434 struct isert_conn *isert_conn = wc->qp->qp_context;
1435 struct ib_device *ib_dev = isert_conn->cm_id->device;
1437 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1438 isert_print_wc(wc, "login recv");
1442 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1443 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1445 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1447 if (isert_conn->conn) {
1448 struct iscsi_login *login = isert_conn->conn->conn_login;
1450 if (login && !login->first_request)
1451 isert_rx_login_req(isert_conn);
1454 mutex_lock(&isert_conn->mutex);
1455 complete(&isert_conn->login_req_comp);
1456 mutex_unlock(&isert_conn->mutex);
1458 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1459 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1463 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1465 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1466 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1468 if (!cmd->rw.nr_ops)
1471 if (isert_prot_cmd(conn, se_cmd)) {
1472 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1473 conn->cm_id->port_num, se_cmd->t_data_sg,
1474 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1475 se_cmd->t_prot_nents, dir);
1477 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1478 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1485 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1487 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1488 struct isert_conn *isert_conn = isert_cmd->conn;
1489 struct iscsi_conn *conn = isert_conn->conn;
1490 struct iscsi_text_rsp *hdr;
1492 isert_dbg("Cmd %p\n", isert_cmd);
1494 switch (cmd->iscsi_opcode) {
1495 case ISCSI_OP_SCSI_CMD:
1496 spin_lock_bh(&conn->cmd_lock);
1497 if (!list_empty(&cmd->i_conn_node))
1498 list_del_init(&cmd->i_conn_node);
1499 spin_unlock_bh(&conn->cmd_lock);
1501 if (cmd->data_direction == DMA_TO_DEVICE) {
1502 iscsit_stop_dataout_timer(cmd);
1504 * Check for special case during comp_err where
1505 * WRITE_PENDING has been handed off from core,
1506 * but requires an extra target_put_sess_cmd()
1507 * before transport_generic_free_cmd() below.
1510 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1511 struct se_cmd *se_cmd = &cmd->se_cmd;
1513 target_put_sess_cmd(se_cmd);
1517 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1518 transport_generic_free_cmd(&cmd->se_cmd, 0);
1520 case ISCSI_OP_SCSI_TMFUNC:
1521 spin_lock_bh(&conn->cmd_lock);
1522 if (!list_empty(&cmd->i_conn_node))
1523 list_del_init(&cmd->i_conn_node);
1524 spin_unlock_bh(&conn->cmd_lock);
1526 transport_generic_free_cmd(&cmd->se_cmd, 0);
1528 case ISCSI_OP_REJECT:
1529 case ISCSI_OP_NOOP_OUT:
1531 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1532 /* If the continue bit is on, keep the command alive */
1533 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1536 spin_lock_bh(&conn->cmd_lock);
1537 if (!list_empty(&cmd->i_conn_node))
1538 list_del_init(&cmd->i_conn_node);
1539 spin_unlock_bh(&conn->cmd_lock);
1542 * Handle special case for REJECT when iscsi_add_reject*() has
1543 * overwritten the original iscsi_opcode assignment, and the
1544 * associated cmd->se_cmd needs to be released.
1546 if (cmd->se_cmd.se_tfo != NULL) {
1547 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1549 transport_generic_free_cmd(&cmd->se_cmd, 0);
1556 iscsit_release_cmd(cmd);
1562 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1564 if (tx_desc->dma_addr != 0) {
1565 isert_dbg("unmap single for tx_desc->dma_addr\n");
1566 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1567 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1568 tx_desc->dma_addr = 0;
1573 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1574 struct ib_device *ib_dev, bool comp_err)
1576 if (isert_cmd->pdu_buf_dma != 0) {
1577 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1578 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1579 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1580 isert_cmd->pdu_buf_dma = 0;
1583 isert_unmap_tx_desc(tx_desc, ib_dev);
1584 isert_put_cmd(isert_cmd, comp_err);
1588 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1590 struct ib_mr_status mr_status;
1593 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1595 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1596 goto fail_mr_status;
1599 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1601 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1603 switch (mr_status.sig_err.err_type) {
1604 case IB_SIG_BAD_GUARD:
1605 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1607 case IB_SIG_BAD_REFTAG:
1608 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1610 case IB_SIG_BAD_APPTAG:
1611 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1614 sec_offset_err = mr_status.sig_err.sig_err_offset;
1615 do_div(sec_offset_err, block_size);
1616 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1618 isert_err("PI error found type %d at sector 0x%llx "
1619 "expected 0x%x vs actual 0x%x\n",
1620 mr_status.sig_err.err_type,
1621 (unsigned long long)se_cmd->bad_sector,
1622 mr_status.sig_err.expected,
1623 mr_status.sig_err.actual);
1632 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1634 struct isert_conn *isert_conn = wc->qp->qp_context;
1635 struct isert_device *device = isert_conn->device;
1636 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1637 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1638 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1641 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1642 isert_print_wc(wc, "rdma write");
1643 if (wc->status != IB_WC_WR_FLUSH_ERR)
1644 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1645 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1649 isert_dbg("Cmd %p\n", isert_cmd);
1651 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1652 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1655 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1657 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1661 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1663 struct isert_conn *isert_conn = wc->qp->qp_context;
1664 struct isert_device *device = isert_conn->device;
1665 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1666 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1667 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1668 struct se_cmd *se_cmd = &cmd->se_cmd;
1671 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1672 isert_print_wc(wc, "rdma read");
1673 if (wc->status != IB_WC_WR_FLUSH_ERR)
1674 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1675 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1679 isert_dbg("Cmd %p\n", isert_cmd);
1681 iscsit_stop_dataout_timer(cmd);
1683 if (isert_prot_cmd(isert_conn, se_cmd))
1684 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1685 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1686 cmd->write_data_done = 0;
1688 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1689 spin_lock_bh(&cmd->istate_lock);
1690 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1691 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1692 spin_unlock_bh(&cmd->istate_lock);
1695 target_put_sess_cmd(se_cmd);
1696 transport_send_check_condition_and_sense(se_cmd,
1699 target_execute_cmd(se_cmd);
1704 isert_do_control_comp(struct work_struct *work)
1706 struct isert_cmd *isert_cmd = container_of(work,
1707 struct isert_cmd, comp_work);
1708 struct isert_conn *isert_conn = isert_cmd->conn;
1709 struct ib_device *ib_dev = isert_conn->cm_id->device;
1710 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1712 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1714 switch (cmd->i_state) {
1715 case ISTATE_SEND_TASKMGTRSP:
1716 iscsit_tmr_post_handler(cmd, cmd->conn);
1717 case ISTATE_SEND_REJECT: /* FALLTHRU */
1718 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1719 cmd->i_state = ISTATE_SENT_STATUS;
1720 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1723 case ISTATE_SEND_LOGOUTRSP:
1724 iscsit_logout_post_handler(cmd, cmd->conn);
1727 isert_err("Unknown i_state %d\n", cmd->i_state);
1734 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1736 struct isert_conn *isert_conn = wc->qp->qp_context;
1737 struct ib_device *ib_dev = isert_conn->cm_id->device;
1738 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1740 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1741 isert_print_wc(wc, "login send");
1742 if (wc->status != IB_WC_WR_FLUSH_ERR)
1743 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1746 isert_unmap_tx_desc(tx_desc, ib_dev);
1750 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1752 struct isert_conn *isert_conn = wc->qp->qp_context;
1753 struct ib_device *ib_dev = isert_conn->cm_id->device;
1754 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1755 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1757 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1758 isert_print_wc(wc, "send");
1759 if (wc->status != IB_WC_WR_FLUSH_ERR)
1760 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1761 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1765 isert_dbg("Cmd %p\n", isert_cmd);
1767 switch (isert_cmd->iscsi_cmd->i_state) {
1768 case ISTATE_SEND_TASKMGTRSP:
1769 case ISTATE_SEND_LOGOUTRSP:
1770 case ISTATE_SEND_REJECT:
1771 case ISTATE_SEND_TEXTRSP:
1772 isert_unmap_tx_desc(tx_desc, ib_dev);
1774 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1775 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1778 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1779 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1785 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1787 struct ib_send_wr *wr_failed;
1790 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1792 isert_err("ib_post_recv failed with %d\n", ret);
1796 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1799 isert_err("ib_post_send failed with %d\n", ret);
1806 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1808 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1809 struct isert_conn *isert_conn = conn->context;
1810 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1811 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1812 &isert_cmd->tx_desc.iscsi_header;
1814 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1815 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1816 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1818 * Attach SENSE DATA payload to iSCSI Response PDU
1820 if (cmd->se_cmd.sense_buffer &&
1821 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1822 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1823 struct isert_device *device = isert_conn->device;
1824 struct ib_device *ib_dev = device->ib_device;
1825 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1826 u32 padding, pdu_len;
1828 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1830 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1832 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1833 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1834 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1836 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1837 (void *)cmd->sense_buffer, pdu_len,
1840 isert_cmd->pdu_buf_len = pdu_len;
1841 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1842 tx_dsg->length = pdu_len;
1843 tx_dsg->lkey = device->pd->local_dma_lkey;
1844 isert_cmd->tx_desc.num_sge = 2;
1847 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1849 isert_dbg("Posting SCSI Response\n");
1851 return isert_post_response(isert_conn, isert_cmd);
1855 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1857 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1858 struct isert_conn *isert_conn = conn->context;
1860 spin_lock_bh(&conn->cmd_lock);
1861 if (!list_empty(&cmd->i_conn_node))
1862 list_del_init(&cmd->i_conn_node);
1863 spin_unlock_bh(&conn->cmd_lock);
1865 if (cmd->data_direction == DMA_TO_DEVICE)
1866 iscsit_stop_dataout_timer(cmd);
1867 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1870 static enum target_prot_op
1871 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1873 struct isert_conn *isert_conn = conn->context;
1874 struct isert_device *device = isert_conn->device;
1876 if (conn->tpg->tpg_attrib.t10_pi) {
1877 if (device->pi_capable) {
1878 isert_info("conn %p PI offload enabled\n", isert_conn);
1879 isert_conn->pi_support = true;
1880 return TARGET_PROT_ALL;
1884 isert_info("conn %p PI offload disabled\n", isert_conn);
1885 isert_conn->pi_support = false;
1887 return TARGET_PROT_NORMAL;
1891 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1892 bool nopout_response)
1894 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895 struct isert_conn *isert_conn = conn->context;
1896 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1898 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1899 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1900 &isert_cmd->tx_desc.iscsi_header,
1902 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1903 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1905 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1907 return isert_post_response(isert_conn, isert_cmd);
1911 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1913 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1914 struct isert_conn *isert_conn = conn->context;
1915 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1917 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1918 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1919 &isert_cmd->tx_desc.iscsi_header);
1920 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1921 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1923 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1925 return isert_post_response(isert_conn, isert_cmd);
1929 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1931 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1932 struct isert_conn *isert_conn = conn->context;
1933 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1935 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1937 &isert_cmd->tx_desc.iscsi_header);
1938 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1939 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1941 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1943 return isert_post_response(isert_conn, isert_cmd);
1947 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1949 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1950 struct isert_conn *isert_conn = conn->context;
1951 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1952 struct isert_device *device = isert_conn->device;
1953 struct ib_device *ib_dev = device->ib_device;
1954 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1955 struct iscsi_reject *hdr =
1956 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1958 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1959 iscsit_build_reject(cmd, conn, hdr);
1960 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1962 hton24(hdr->dlength, ISCSI_HDR_LEN);
1963 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1964 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1966 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1967 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1968 tx_dsg->length = ISCSI_HDR_LEN;
1969 tx_dsg->lkey = device->pd->local_dma_lkey;
1970 isert_cmd->tx_desc.num_sge = 2;
1972 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1974 isert_dbg("conn %p Posting Reject\n", isert_conn);
1976 return isert_post_response(isert_conn, isert_cmd);
1980 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1982 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1983 struct isert_conn *isert_conn = conn->context;
1984 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1985 struct iscsi_text_rsp *hdr =
1986 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1990 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1991 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1996 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1999 struct isert_device *device = isert_conn->device;
2000 struct ib_device *ib_dev = device->ib_device;
2001 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2002 void *txt_rsp_buf = cmd->buf_ptr;
2004 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2005 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2007 isert_cmd->pdu_buf_len = txt_rsp_len;
2008 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2009 tx_dsg->length = txt_rsp_len;
2010 tx_dsg->lkey = device->pd->local_dma_lkey;
2011 isert_cmd->tx_desc.num_sge = 2;
2013 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2015 isert_dbg("conn %p Text Response\n", isert_conn);
2017 return isert_post_response(isert_conn, isert_cmd);
2021 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2022 struct ib_sig_domain *domain)
2024 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2025 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2026 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2027 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2029 * At the moment we hard code those, but if in the future
2030 * the target core would like to use it, we will take it
2033 domain->sig.dif.apptag_check_mask = 0xffff;
2034 domain->sig.dif.app_escape = true;
2035 domain->sig.dif.ref_escape = true;
2036 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2037 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2038 domain->sig.dif.ref_remap = true;
2042 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2044 memset(sig_attrs, 0, sizeof(*sig_attrs));
2046 switch (se_cmd->prot_op) {
2047 case TARGET_PROT_DIN_INSERT:
2048 case TARGET_PROT_DOUT_STRIP:
2049 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2050 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2052 case TARGET_PROT_DOUT_INSERT:
2053 case TARGET_PROT_DIN_STRIP:
2054 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2055 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2057 case TARGET_PROT_DIN_PASS:
2058 case TARGET_PROT_DOUT_PASS:
2059 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2060 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2063 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2067 sig_attrs->check_mask =
2068 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2069 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2070 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2075 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2076 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2078 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2079 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2080 u8 port_num = conn->cm_id->port_num;
2085 if (dir == DMA_FROM_DEVICE) {
2086 addr = cmd->write_va;
2087 rkey = cmd->write_stag;
2088 offset = cmd->iscsi_cmd->write_data_done;
2090 addr = cmd->read_va;
2091 rkey = cmd->read_stag;
2095 if (isert_prot_cmd(conn, se_cmd)) {
2096 struct ib_sig_attrs sig_attrs;
2098 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2102 WARN_ON_ONCE(offset);
2103 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2104 se_cmd->t_data_sg, se_cmd->t_data_nents,
2105 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2106 &sig_attrs, addr, rkey, dir);
2108 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2109 se_cmd->t_data_sg, se_cmd->t_data_nents,
2110 offset, addr, rkey, dir);
2113 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2117 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2119 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2124 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2126 struct se_cmd *se_cmd = &cmd->se_cmd;
2127 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2128 struct isert_conn *isert_conn = conn->context;
2129 struct ib_cqe *cqe = NULL;
2130 struct ib_send_wr *chain_wr = NULL;
2133 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2134 isert_cmd, se_cmd->data_length);
2136 if (isert_prot_cmd(isert_conn, se_cmd)) {
2137 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2138 cqe = &isert_cmd->tx_desc.tx_cqe;
2141 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2143 isert_create_send_desc(isert_conn, isert_cmd,
2144 &isert_cmd->tx_desc);
2145 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2146 &isert_cmd->tx_desc.iscsi_header);
2147 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2148 isert_init_send_wr(isert_conn, isert_cmd,
2149 &isert_cmd->tx_desc.send_wr);
2151 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2153 isert_err("ib_post_recv failed with %d\n", rc);
2157 chain_wr = &isert_cmd->tx_desc.send_wr;
2160 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2161 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2166 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2168 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2170 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2171 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2173 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2174 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2175 &isert_cmd->tx_desc.tx_cqe, NULL);
2177 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2183 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2185 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2190 spin_lock_bh(&conn->cmd_lock);
2191 list_del_init(&cmd->i_conn_node);
2192 spin_unlock_bh(&conn->cmd_lock);
2193 isert_put_cmd(isert_cmd, true);
2195 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2196 ret = isert_put_nopin(cmd, conn, false);
2199 isert_err("Unknown immediate state: 0x%02x\n", state);
2208 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2210 struct isert_conn *isert_conn = conn->context;
2214 case ISTATE_SEND_LOGOUTRSP:
2215 ret = isert_put_logout_rsp(cmd, conn);
2217 isert_conn->logout_posted = true;
2219 case ISTATE_SEND_NOPIN:
2220 ret = isert_put_nopin(cmd, conn, true);
2222 case ISTATE_SEND_TASKMGTRSP:
2223 ret = isert_put_tm_rsp(cmd, conn);
2225 case ISTATE_SEND_REJECT:
2226 ret = isert_put_reject(cmd, conn);
2228 case ISTATE_SEND_TEXTRSP:
2229 ret = isert_put_text_rsp(cmd, conn);
2231 case ISTATE_SEND_STATUS:
2233 * Special case for sending non GOOD SCSI status from TX thread
2234 * context during pre se_cmd excecution failure.
2236 ret = isert_put_response(conn, cmd);
2239 isert_err("Unknown response state: 0x%02x\n", state);
2248 isert_setup_id(struct isert_np *isert_np)
2250 struct iscsi_np *np = isert_np->np;
2251 struct rdma_cm_id *id;
2252 struct sockaddr *sa;
2255 sa = (struct sockaddr *)&np->np_sockaddr;
2256 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2258 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2259 RDMA_PS_TCP, IB_QPT_RC);
2261 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2265 isert_dbg("id %p context %p\n", id, id->context);
2267 ret = rdma_bind_addr(id, sa);
2269 isert_err("rdma_bind_addr() failed: %d\n", ret);
2273 ret = rdma_listen(id, 0);
2275 isert_err("rdma_listen() failed: %d\n", ret);
2281 rdma_destroy_id(id);
2283 return ERR_PTR(ret);
2287 isert_setup_np(struct iscsi_np *np,
2288 struct sockaddr_storage *ksockaddr)
2290 struct isert_np *isert_np;
2291 struct rdma_cm_id *isert_lid;
2294 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2296 isert_err("Unable to allocate struct isert_np\n");
2299 sema_init(&isert_np->sem, 0);
2300 mutex_init(&isert_np->mutex);
2301 INIT_LIST_HEAD(&isert_np->accepted);
2302 INIT_LIST_HEAD(&isert_np->pending);
2306 * Setup the np->np_sockaddr from the passed sockaddr setup
2307 * in iscsi_target_configfs.c code..
2309 memcpy(&np->np_sockaddr, ksockaddr,
2310 sizeof(struct sockaddr_storage));
2312 isert_lid = isert_setup_id(isert_np);
2313 if (IS_ERR(isert_lid)) {
2314 ret = PTR_ERR(isert_lid);
2318 isert_np->cm_id = isert_lid;
2319 np->np_context = isert_np;
2330 isert_rdma_accept(struct isert_conn *isert_conn)
2332 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2333 struct rdma_conn_param cp;
2335 struct iser_cm_hdr rsp_hdr;
2337 memset(&cp, 0, sizeof(struct rdma_conn_param));
2338 cp.initiator_depth = isert_conn->initiator_depth;
2340 cp.rnr_retry_count = 7;
2342 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2343 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2344 if (!isert_conn->snd_w_inv)
2345 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2346 cp.private_data = (void *)&rsp_hdr;
2347 cp.private_data_len = sizeof(rsp_hdr);
2349 ret = rdma_accept(cm_id, &cp);
2351 isert_err("rdma_accept() failed with: %d\n", ret);
2359 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2361 struct isert_conn *isert_conn = conn->context;
2364 isert_info("before login_req comp conn: %p\n", isert_conn);
2365 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2367 isert_err("isert_conn %p interrupted before got login req\n",
2371 reinit_completion(&isert_conn->login_req_comp);
2374 * For login requests after the first PDU, isert_rx_login_req() will
2375 * kick schedule_delayed_work(&conn->login_work) as the packet is
2376 * received, which turns this callback from iscsi_target_do_login_rx()
2379 if (!login->first_request)
2382 isert_rx_login_req(isert_conn);
2384 isert_info("before login_comp conn: %p\n", conn);
2385 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2389 isert_info("processing login->req: %p\n", login->req);
2395 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2396 struct isert_conn *isert_conn)
2398 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2399 struct rdma_route *cm_route = &cm_id->route;
2401 conn->login_family = np->np_sockaddr.ss_family;
2403 conn->login_sockaddr = cm_route->addr.dst_addr;
2404 conn->local_sockaddr = cm_route->addr.src_addr;
2408 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2410 struct isert_np *isert_np = np->np_context;
2411 struct isert_conn *isert_conn;
2415 ret = down_interruptible(&isert_np->sem);
2419 spin_lock_bh(&np->np_thread_lock);
2420 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2421 spin_unlock_bh(&np->np_thread_lock);
2422 isert_dbg("np_thread_state %d\n",
2423 np->np_thread_state);
2425 * No point in stalling here when np_thread
2426 * is in state RESET/SHUTDOWN/EXIT - bail
2430 spin_unlock_bh(&np->np_thread_lock);
2432 mutex_lock(&isert_np->mutex);
2433 if (list_empty(&isert_np->pending)) {
2434 mutex_unlock(&isert_np->mutex);
2437 isert_conn = list_first_entry(&isert_np->pending,
2438 struct isert_conn, node);
2439 list_del_init(&isert_conn->node);
2440 mutex_unlock(&isert_np->mutex);
2442 conn->context = isert_conn;
2443 isert_conn->conn = conn;
2444 isert_conn->state = ISER_CONN_BOUND;
2446 isert_set_conn_info(np, conn, isert_conn);
2448 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2454 isert_free_np(struct iscsi_np *np)
2456 struct isert_np *isert_np = np->np_context;
2457 struct isert_conn *isert_conn, *n;
2459 if (isert_np->cm_id)
2460 rdma_destroy_id(isert_np->cm_id);
2463 * FIXME: At this point we don't have a good way to insure
2464 * that at this point we don't have hanging connections that
2465 * completed RDMA establishment but didn't start iscsi login
2466 * process. So work-around this by cleaning up what ever piled
2467 * up in accepted and pending lists.
2469 mutex_lock(&isert_np->mutex);
2470 if (!list_empty(&isert_np->pending)) {
2471 isert_info("Still have isert pending connections\n");
2472 list_for_each_entry_safe(isert_conn, n,
2475 isert_info("cleaning isert_conn %p state (%d)\n",
2476 isert_conn, isert_conn->state);
2477 isert_connect_release(isert_conn);
2481 if (!list_empty(&isert_np->accepted)) {
2482 isert_info("Still have isert accepted connections\n");
2483 list_for_each_entry_safe(isert_conn, n,
2484 &isert_np->accepted,
2486 isert_info("cleaning isert_conn %p state (%d)\n",
2487 isert_conn, isert_conn->state);
2488 isert_connect_release(isert_conn);
2491 mutex_unlock(&isert_np->mutex);
2493 np->np_context = NULL;
2497 static void isert_release_work(struct work_struct *work)
2499 struct isert_conn *isert_conn = container_of(work,
2503 isert_info("Starting release conn %p\n", isert_conn);
2505 mutex_lock(&isert_conn->mutex);
2506 isert_conn->state = ISER_CONN_DOWN;
2507 mutex_unlock(&isert_conn->mutex);
2509 isert_info("Destroying conn %p\n", isert_conn);
2510 isert_put_conn(isert_conn);
2514 isert_wait4logout(struct isert_conn *isert_conn)
2516 struct iscsi_conn *conn = isert_conn->conn;
2518 isert_info("conn %p\n", isert_conn);
2520 if (isert_conn->logout_posted) {
2521 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2522 wait_for_completion_timeout(&conn->conn_logout_comp,
2523 SECONDS_FOR_LOGOUT_COMP * HZ);
2528 isert_wait4cmds(struct iscsi_conn *conn)
2530 isert_info("iscsi_conn %p\n", conn);
2533 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2534 target_wait_for_sess_cmds(conn->sess->se_sess);
2539 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2540 * unsolicitate dataout
2541 * @conn: iscsi connection
2543 * We might still have commands that are waiting for unsolicited
2544 * dataouts messages. We must put the extra reference on those
2545 * before blocking on the target_wait_for_session_cmds
2548 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2550 struct iscsi_cmd *cmd, *tmp;
2551 static LIST_HEAD(drop_cmd_list);
2553 spin_lock_bh(&conn->cmd_lock);
2554 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2555 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2556 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2557 (cmd->write_data_done < cmd->se_cmd.data_length))
2558 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2560 spin_unlock_bh(&conn->cmd_lock);
2562 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2563 list_del_init(&cmd->i_conn_node);
2564 if (cmd->i_state != ISTATE_REMOVE) {
2565 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2567 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2568 isert_put_cmd(isert_cmd, true);
2573 static void isert_wait_conn(struct iscsi_conn *conn)
2575 struct isert_conn *isert_conn = conn->context;
2577 isert_info("Starting conn %p\n", isert_conn);
2579 mutex_lock(&isert_conn->mutex);
2580 isert_conn_terminate(isert_conn);
2581 mutex_unlock(&isert_conn->mutex);
2583 ib_drain_qp(isert_conn->qp);
2584 isert_put_unsol_pending_cmds(conn);
2585 isert_wait4cmds(conn);
2586 isert_wait4logout(isert_conn);
2588 queue_work(isert_release_wq, &isert_conn->release_work);
2591 static void isert_free_conn(struct iscsi_conn *conn)
2593 struct isert_conn *isert_conn = conn->context;
2595 ib_drain_qp(isert_conn->qp);
2596 isert_put_conn(isert_conn);
2599 static struct iscsit_transport iser_target_transport = {
2601 .transport_type = ISCSI_INFINIBAND,
2602 .priv_size = sizeof(struct isert_cmd),
2603 .owner = THIS_MODULE,
2604 .iscsit_setup_np = isert_setup_np,
2605 .iscsit_accept_np = isert_accept_np,
2606 .iscsit_free_np = isert_free_np,
2607 .iscsit_wait_conn = isert_wait_conn,
2608 .iscsit_free_conn = isert_free_conn,
2609 .iscsit_get_login_rx = isert_get_login_rx,
2610 .iscsit_put_login_tx = isert_put_login_tx,
2611 .iscsit_immediate_queue = isert_immediate_queue,
2612 .iscsit_response_queue = isert_response_queue,
2613 .iscsit_get_dataout = isert_get_dataout,
2614 .iscsit_queue_data_in = isert_put_datain,
2615 .iscsit_queue_status = isert_put_response,
2616 .iscsit_aborted_task = isert_aborted_task,
2617 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2620 static int __init isert_init(void)
2624 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2625 WQ_UNBOUND | WQ_HIGHPRI, 0);
2626 if (!isert_comp_wq) {
2627 isert_err("Unable to allocate isert_comp_wq\n");
2632 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2633 WQ_UNBOUND_MAX_ACTIVE);
2634 if (!isert_release_wq) {
2635 isert_err("Unable to allocate isert_release_wq\n");
2637 goto destroy_comp_wq;
2640 iscsit_register_transport(&iser_target_transport);
2641 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2646 destroy_workqueue(isert_comp_wq);
2651 static void __exit isert_exit(void)
2653 flush_scheduled_work();
2654 destroy_workqueue(isert_release_wq);
2655 destroy_workqueue(isert_comp_wq);
2656 iscsit_unregister_transport(&iser_target_transport);
2657 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2660 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2661 MODULE_VERSION("1.0");
2662 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2663 MODULE_LICENSE("GPL");
2665 module_init(isert_init);
2666 module_exit(isert_exit);