1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains iSCSI extentions for RDMA (iSER) Verbs
5 * (c) Copyright 2013 Datera, Inc.
7 * Nicholas A. Bellinger <nab@linux-iscsi.org>
9 ****************************************************************************/
11 #include <linux/string.h>
12 #include <linux/module.h>
13 #include <linux/scatterlist.h>
14 #include <linux/socket.h>
16 #include <linux/in6.h>
17 #include <rdma/ib_verbs.h>
18 #include <rdma/ib_cm.h>
19 #include <rdma/rdma_cm.h>
20 #include <target/target_core_base.h>
21 #include <target/target_core_fabric.h>
22 #include <target/iscsi/iscsi_transport.h>
23 #include <linux/semaphore.h>
27 static int isert_debug_level;
28 module_param_named(debug_level, isert_debug_level, int, 0644);
29 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
31 static int isert_sg_tablesize_set(const char *val,
32 const struct kernel_param *kp);
33 static const struct kernel_param_ops sg_tablesize_ops = {
34 .set = isert_sg_tablesize_set,
38 static int isert_sg_tablesize = ISCSI_ISER_MIN_SG_TABLESIZE;
39 module_param_cb(sg_tablesize, &sg_tablesize_ops, &isert_sg_tablesize, 0644);
40 MODULE_PARM_DESC(sg_tablesize,
41 "Number of gather/scatter entries in a single scsi command, should >= 128 (default: 128, max: 4096)");
43 static DEFINE_MUTEX(device_list_mutex);
44 static LIST_HEAD(device_list);
45 static struct workqueue_struct *isert_login_wq;
46 static struct workqueue_struct *isert_comp_wq;
47 static struct workqueue_struct *isert_release_wq;
50 isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd);
52 isert_login_post_recv(struct isert_conn *isert_conn);
54 isert_rdma_accept(struct isert_conn *isert_conn);
55 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
57 static void isert_release_work(struct work_struct *work);
58 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
59 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
60 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
61 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
63 static int isert_sg_tablesize_set(const char *val, const struct kernel_param *kp)
67 ret = kstrtoint(val, 10, &n);
68 if (ret != 0 || n < ISCSI_ISER_MIN_SG_TABLESIZE ||
69 n > ISCSI_ISER_MAX_SG_TABLESIZE)
72 return param_set_int(val, kp);
76 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
78 return (conn->pi_support &&
79 cmd->prot_op != TARGET_PROT_NORMAL);
83 isert_qp_event_callback(struct ib_event *e, void *context)
85 struct isert_conn *isert_conn = context;
87 isert_err("%s (%d): conn %p\n",
88 ib_event_msg(e->event), e->event, isert_conn);
91 case IB_EVENT_COMM_EST:
92 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
94 case IB_EVENT_QP_LAST_WQE_REACHED:
95 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
102 static struct ib_qp *
103 isert_create_qp(struct isert_conn *isert_conn,
104 struct rdma_cm_id *cma_id)
106 u32 cq_size = ISERT_QP_MAX_REQ_DTOS + ISERT_QP_MAX_RECV_DTOS + 2;
107 struct isert_device *device = isert_conn->device;
108 struct ib_device *ib_dev = device->ib_device;
109 struct ib_qp_init_attr attr;
112 isert_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_WORKQUEUE);
113 if (IS_ERR(isert_conn->cq)) {
114 isert_err("Unable to allocate cq\n");
115 ret = PTR_ERR(isert_conn->cq);
118 isert_conn->cq_size = cq_size;
120 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
121 attr.event_handler = isert_qp_event_callback;
122 attr.qp_context = isert_conn;
123 attr.send_cq = isert_conn->cq;
124 attr.recv_cq = isert_conn->cq;
125 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
126 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
127 factor = rdma_rw_mr_factor(device->ib_device, cma_id->port_num,
129 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX * factor;
130 attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
131 attr.cap.max_recv_sge = 1;
132 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
133 attr.qp_type = IB_QPT_RC;
134 if (device->pi_capable)
135 attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
137 ret = rdma_create_qp(cma_id, device->pd, &attr);
139 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
140 ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
149 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
151 struct isert_device *device = isert_conn->device;
152 struct ib_device *ib_dev = device->ib_device;
153 struct iser_rx_desc *rx_desc;
154 struct ib_sge *rx_sg;
158 isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
159 sizeof(struct iser_rx_desc),
161 if (!isert_conn->rx_descs)
164 rx_desc = isert_conn->rx_descs;
166 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
167 dma_addr = ib_dma_map_single(ib_dev, rx_desc->buf,
168 ISER_RX_SIZE, DMA_FROM_DEVICE);
169 if (ib_dma_mapping_error(ib_dev, dma_addr))
172 rx_desc->dma_addr = dma_addr;
174 rx_sg = &rx_desc->rx_sg;
175 rx_sg->addr = rx_desc->dma_addr + isert_get_hdr_offset(rx_desc);
176 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
177 rx_sg->lkey = device->pd->local_dma_lkey;
178 rx_desc->rx_cqe.done = isert_recv_done;
184 rx_desc = isert_conn->rx_descs;
185 for (j = 0; j < i; j++, rx_desc++) {
186 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
187 ISER_RX_SIZE, DMA_FROM_DEVICE);
189 kfree(isert_conn->rx_descs);
190 isert_conn->rx_descs = NULL;
191 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
196 isert_free_rx_descriptors(struct isert_conn *isert_conn)
198 struct ib_device *ib_dev = isert_conn->device->ib_device;
199 struct iser_rx_desc *rx_desc;
202 if (!isert_conn->rx_descs)
205 rx_desc = isert_conn->rx_descs;
206 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
207 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
208 ISER_RX_SIZE, DMA_FROM_DEVICE);
211 kfree(isert_conn->rx_descs);
212 isert_conn->rx_descs = NULL;
216 isert_create_device_ib_res(struct isert_device *device)
218 struct ib_device *ib_dev = device->ib_device;
221 isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
222 ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
223 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
225 device->pd = ib_alloc_pd(ib_dev, 0);
226 if (IS_ERR(device->pd)) {
227 ret = PTR_ERR(device->pd);
228 isert_err("failed to allocate pd, device %p, ret=%d\n",
233 /* Check signature cap */
234 if (ib_dev->attrs.kernel_cap_flags & IBK_INTEGRITY_HANDOVER)
235 device->pi_capable = true;
237 device->pi_capable = false;
243 isert_free_device_ib_res(struct isert_device *device)
245 isert_info("device %p\n", device);
247 ib_dealloc_pd(device->pd);
251 isert_device_put(struct isert_device *device)
253 mutex_lock(&device_list_mutex);
255 isert_info("device %p refcount %d\n", device, device->refcount);
256 if (!device->refcount) {
257 isert_free_device_ib_res(device);
258 list_del(&device->dev_node);
261 mutex_unlock(&device_list_mutex);
264 static struct isert_device *
265 isert_device_get(struct rdma_cm_id *cma_id)
267 struct isert_device *device;
270 mutex_lock(&device_list_mutex);
271 list_for_each_entry(device, &device_list, dev_node) {
272 if (device->ib_device->node_guid == cma_id->device->node_guid) {
274 isert_info("Found iser device %p refcount %d\n",
275 device, device->refcount);
276 mutex_unlock(&device_list_mutex);
281 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
283 mutex_unlock(&device_list_mutex);
284 return ERR_PTR(-ENOMEM);
287 INIT_LIST_HEAD(&device->dev_node);
289 device->ib_device = cma_id->device;
290 ret = isert_create_device_ib_res(device);
293 mutex_unlock(&device_list_mutex);
298 list_add_tail(&device->dev_node, &device_list);
299 isert_info("Created a new iser device %p refcount %d\n",
300 device, device->refcount);
301 mutex_unlock(&device_list_mutex);
307 isert_init_conn(struct isert_conn *isert_conn)
309 isert_conn->state = ISER_CONN_INIT;
310 INIT_LIST_HEAD(&isert_conn->node);
311 init_completion(&isert_conn->login_comp);
312 init_completion(&isert_conn->login_req_comp);
313 init_waitqueue_head(&isert_conn->rem_wait);
314 kref_init(&isert_conn->kref);
315 mutex_init(&isert_conn->mutex);
316 INIT_WORK(&isert_conn->release_work, isert_release_work);
320 isert_free_login_buf(struct isert_conn *isert_conn)
322 struct ib_device *ib_dev = isert_conn->device->ib_device;
324 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
325 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
326 kfree(isert_conn->login_rsp_buf);
328 ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
329 ISER_RX_SIZE, DMA_FROM_DEVICE);
330 kfree(isert_conn->login_desc);
334 isert_alloc_login_buf(struct isert_conn *isert_conn,
335 struct ib_device *ib_dev)
339 isert_conn->login_desc = kzalloc(sizeof(*isert_conn->login_desc),
341 if (!isert_conn->login_desc)
344 isert_conn->login_desc->dma_addr = ib_dma_map_single(ib_dev,
345 isert_conn->login_desc->buf,
346 ISER_RX_SIZE, DMA_FROM_DEVICE);
347 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_desc->dma_addr);
349 isert_err("login_desc dma mapping error: %d\n", ret);
350 isert_conn->login_desc->dma_addr = 0;
351 goto out_free_login_desc;
354 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
355 if (!isert_conn->login_rsp_buf) {
357 goto out_unmap_login_desc;
360 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
361 isert_conn->login_rsp_buf,
362 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
363 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
365 isert_err("login_rsp_dma mapping error: %d\n", ret);
366 isert_conn->login_rsp_dma = 0;
367 goto out_free_login_rsp_buf;
372 out_free_login_rsp_buf:
373 kfree(isert_conn->login_rsp_buf);
374 out_unmap_login_desc:
375 ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
376 ISER_RX_SIZE, DMA_FROM_DEVICE);
378 kfree(isert_conn->login_desc);
383 isert_set_nego_params(struct isert_conn *isert_conn,
384 struct rdma_conn_param *param)
386 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
388 /* Set max inflight RDMA READ requests */
389 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
390 attr->max_qp_init_rd_atom);
391 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
393 if (param->private_data) {
394 u8 flags = *(u8 *)param->private_data;
397 * use remote invalidation if the both initiator
398 * and the HCA support it
400 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
401 (attr->device_cap_flags &
402 IB_DEVICE_MEM_MGT_EXTENSIONS);
403 if (isert_conn->snd_w_inv)
404 isert_info("Using remote invalidation\n");
409 isert_destroy_qp(struct isert_conn *isert_conn)
411 ib_destroy_qp(isert_conn->qp);
412 ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
416 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
418 struct isert_np *isert_np = cma_id->context;
419 struct iscsi_np *np = isert_np->np;
420 struct isert_conn *isert_conn;
421 struct isert_device *device;
424 spin_lock_bh(&np->np_thread_lock);
426 spin_unlock_bh(&np->np_thread_lock);
427 isert_dbg("iscsi_np is not enabled, reject connect request\n");
428 return rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
430 spin_unlock_bh(&np->np_thread_lock);
432 isert_dbg("cma_id: %p, portal: %p\n",
433 cma_id, cma_id->context);
435 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
439 isert_init_conn(isert_conn);
440 isert_conn->cm_id = cma_id;
442 device = isert_device_get(cma_id);
443 if (IS_ERR(device)) {
444 ret = PTR_ERR(device);
447 isert_conn->device = device;
449 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
453 isert_set_nego_params(isert_conn, &event->param.conn);
455 isert_conn->qp = isert_create_qp(isert_conn, cma_id);
456 if (IS_ERR(isert_conn->qp)) {
457 ret = PTR_ERR(isert_conn->qp);
458 goto out_rsp_dma_map;
461 ret = isert_login_post_recv(isert_conn);
465 ret = isert_rdma_accept(isert_conn);
469 mutex_lock(&isert_np->mutex);
470 list_add_tail(&isert_conn->node, &isert_np->accepted);
471 mutex_unlock(&isert_np->mutex);
476 isert_destroy_qp(isert_conn);
478 isert_free_login_buf(isert_conn);
480 isert_device_put(device);
483 rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
488 isert_connect_release(struct isert_conn *isert_conn)
490 struct isert_device *device = isert_conn->device;
492 isert_dbg("conn %p\n", isert_conn);
496 isert_free_rx_descriptors(isert_conn);
497 if (isert_conn->cm_id &&
498 !isert_conn->dev_removed)
499 rdma_destroy_id(isert_conn->cm_id);
502 isert_destroy_qp(isert_conn);
504 if (isert_conn->login_desc)
505 isert_free_login_buf(isert_conn);
507 isert_device_put(device);
509 if (isert_conn->dev_removed)
510 wake_up_interruptible(&isert_conn->rem_wait);
516 isert_connected_handler(struct rdma_cm_id *cma_id)
518 struct isert_conn *isert_conn = cma_id->qp->qp_context;
519 struct isert_np *isert_np = cma_id->context;
521 isert_info("conn %p\n", isert_conn);
523 mutex_lock(&isert_conn->mutex);
524 isert_conn->state = ISER_CONN_UP;
525 kref_get(&isert_conn->kref);
526 mutex_unlock(&isert_conn->mutex);
528 mutex_lock(&isert_np->mutex);
529 list_move_tail(&isert_conn->node, &isert_np->pending);
530 mutex_unlock(&isert_np->mutex);
532 isert_info("np %p: Allow accept_np to continue\n", isert_np);
537 isert_release_kref(struct kref *kref)
539 struct isert_conn *isert_conn = container_of(kref,
540 struct isert_conn, kref);
542 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
545 isert_connect_release(isert_conn);
549 isert_put_conn(struct isert_conn *isert_conn)
551 kref_put(&isert_conn->kref, isert_release_kref);
555 isert_handle_unbound_conn(struct isert_conn *isert_conn)
557 struct isert_np *isert_np = isert_conn->cm_id->context;
559 mutex_lock(&isert_np->mutex);
560 if (!list_empty(&isert_conn->node)) {
562 * This means iscsi doesn't know this connection
563 * so schedule a cleanup ourselves
565 list_del_init(&isert_conn->node);
566 isert_put_conn(isert_conn);
567 queue_work(isert_release_wq, &isert_conn->release_work);
569 mutex_unlock(&isert_np->mutex);
573 * isert_conn_terminate() - Initiate connection termination
574 * @isert_conn: isert connection struct
577 * In case the connection state is BOUND, move state
578 * to TEMINATING and start teardown sequence (rdma_disconnect).
579 * In case the connection state is UP, complete flush as well.
581 * This routine must be called with mutex held. Thus it is
582 * safe to call multiple times.
585 isert_conn_terminate(struct isert_conn *isert_conn)
589 if (isert_conn->state >= ISER_CONN_TERMINATING)
592 isert_info("Terminating conn %p state %d\n",
593 isert_conn, isert_conn->state);
594 isert_conn->state = ISER_CONN_TERMINATING;
595 err = rdma_disconnect(isert_conn->cm_id);
597 isert_warn("Failed rdma_disconnect isert_conn %p\n",
602 isert_np_cma_handler(struct isert_np *isert_np,
603 enum rdma_cm_event_type event)
605 isert_dbg("%s (%d): isert np %p\n",
606 rdma_event_msg(event), event, isert_np);
609 case RDMA_CM_EVENT_DEVICE_REMOVAL:
610 isert_np->cm_id = NULL;
612 case RDMA_CM_EVENT_ADDR_CHANGE:
613 isert_np->cm_id = isert_setup_id(isert_np);
614 if (IS_ERR(isert_np->cm_id)) {
615 isert_err("isert np %p setup id failed: %ld\n",
616 isert_np, PTR_ERR(isert_np->cm_id));
617 isert_np->cm_id = NULL;
621 isert_err("isert np %p Unexpected event %d\n",
629 isert_disconnected_handler(struct rdma_cm_id *cma_id,
630 enum rdma_cm_event_type event)
632 struct isert_conn *isert_conn = cma_id->qp->qp_context;
634 mutex_lock(&isert_conn->mutex);
635 switch (isert_conn->state) {
636 case ISER_CONN_TERMINATING:
639 isert_conn_terminate(isert_conn);
640 ib_drain_qp(isert_conn->qp);
641 isert_handle_unbound_conn(isert_conn);
643 case ISER_CONN_BOUND:
644 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
645 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
648 isert_warn("conn %p terminating in state %d\n",
649 isert_conn, isert_conn->state);
651 mutex_unlock(&isert_conn->mutex);
657 isert_connect_error(struct rdma_cm_id *cma_id)
659 struct isert_conn *isert_conn = cma_id->qp->qp_context;
660 struct isert_np *isert_np = cma_id->context;
662 ib_drain_qp(isert_conn->qp);
664 mutex_lock(&isert_np->mutex);
665 list_del_init(&isert_conn->node);
666 mutex_unlock(&isert_np->mutex);
667 isert_conn->cm_id = NULL;
668 isert_put_conn(isert_conn);
674 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
676 struct isert_np *isert_np = cma_id->context;
677 struct isert_conn *isert_conn;
680 isert_info("%s (%d): status %d id %p np %p\n",
681 rdma_event_msg(event->event), event->event,
682 event->status, cma_id, cma_id->context);
684 if (isert_np->cm_id == cma_id)
685 return isert_np_cma_handler(cma_id->context, event->event);
687 switch (event->event) {
688 case RDMA_CM_EVENT_CONNECT_REQUEST:
689 ret = isert_connect_request(cma_id, event);
691 isert_err("failed handle connect request %d\n", ret);
693 case RDMA_CM_EVENT_ESTABLISHED:
694 isert_connected_handler(cma_id);
696 case RDMA_CM_EVENT_ADDR_CHANGE:
697 case RDMA_CM_EVENT_DISCONNECTED:
698 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
699 ret = isert_disconnected_handler(cma_id, event->event);
701 case RDMA_CM_EVENT_DEVICE_REMOVAL:
702 isert_conn = cma_id->qp->qp_context;
703 isert_conn->dev_removed = true;
704 isert_disconnected_handler(cma_id, event->event);
705 wait_event_interruptible(isert_conn->rem_wait,
706 isert_conn->state == ISER_CONN_DOWN);
709 * return non-zero from the callback to destroy
713 case RDMA_CM_EVENT_REJECTED:
714 isert_info("Connection rejected: %s\n",
715 rdma_reject_msg(cma_id, event->status));
717 case RDMA_CM_EVENT_UNREACHABLE:
718 case RDMA_CM_EVENT_CONNECT_ERROR:
719 ret = isert_connect_error(cma_id);
722 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
730 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
732 struct ib_recv_wr *rx_wr;
734 struct iser_rx_desc *rx_desc;
736 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
737 rx_desc = &isert_conn->rx_descs[i];
739 rx_wr->wr_cqe = &rx_desc->rx_cqe;
740 rx_wr->sg_list = &rx_desc->rx_sg;
742 rx_wr->next = rx_wr + 1;
743 rx_desc->in_use = false;
746 rx_wr->next = NULL; /* mark end of work requests list */
748 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
750 isert_err("ib_post_recv() failed with ret: %d\n", ret);
756 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
758 struct ib_recv_wr rx_wr;
761 if (!rx_desc->in_use) {
763 * if the descriptor is not in-use we already reposted it
764 * for recv, so just silently return
769 rx_desc->in_use = false;
770 rx_wr.wr_cqe = &rx_desc->rx_cqe;
771 rx_wr.sg_list = &rx_desc->rx_sg;
775 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
777 isert_err("ib_post_recv() failed with ret: %d\n", ret);
783 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
785 struct ib_device *ib_dev = isert_conn->cm_id->device;
786 struct ib_send_wr send_wr;
789 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
790 ISER_HEADERS_LEN, DMA_TO_DEVICE);
792 tx_desc->tx_cqe.done = isert_login_send_done;
795 send_wr.wr_cqe = &tx_desc->tx_cqe;
796 send_wr.sg_list = tx_desc->tx_sg;
797 send_wr.num_sge = tx_desc->num_sge;
798 send_wr.opcode = IB_WR_SEND;
799 send_wr.send_flags = IB_SEND_SIGNALED;
801 ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
803 isert_err("ib_post_send() failed, ret: %d\n", ret);
809 __isert_create_send_desc(struct isert_device *device,
810 struct iser_tx_desc *tx_desc)
813 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
814 tx_desc->iser_header.flags = ISCSI_CTRL;
816 tx_desc->num_sge = 1;
818 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
819 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
820 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
825 isert_create_send_desc(struct isert_conn *isert_conn,
826 struct isert_cmd *isert_cmd,
827 struct iser_tx_desc *tx_desc)
829 struct isert_device *device = isert_conn->device;
830 struct ib_device *ib_dev = device->ib_device;
832 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
833 ISER_HEADERS_LEN, DMA_TO_DEVICE);
835 __isert_create_send_desc(device, tx_desc);
839 isert_init_tx_hdrs(struct isert_conn *isert_conn,
840 struct iser_tx_desc *tx_desc)
842 struct isert_device *device = isert_conn->device;
843 struct ib_device *ib_dev = device->ib_device;
846 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
847 ISER_HEADERS_LEN, DMA_TO_DEVICE);
848 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
849 isert_err("ib_dma_mapping_error() failed\n");
853 tx_desc->dma_addr = dma_addr;
854 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
855 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
856 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
858 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
859 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
860 tx_desc->tx_sg[0].lkey);
866 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
867 struct ib_send_wr *send_wr)
869 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
871 tx_desc->tx_cqe.done = isert_send_done;
872 send_wr->wr_cqe = &tx_desc->tx_cqe;
874 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
875 send_wr->opcode = IB_WR_SEND_WITH_INV;
876 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
878 send_wr->opcode = IB_WR_SEND;
881 send_wr->sg_list = &tx_desc->tx_sg[0];
882 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
883 send_wr->send_flags = IB_SEND_SIGNALED;
887 isert_login_post_recv(struct isert_conn *isert_conn)
889 struct ib_recv_wr rx_wr;
893 memset(&sge, 0, sizeof(struct ib_sge));
894 sge.addr = isert_conn->login_desc->dma_addr +
895 isert_get_hdr_offset(isert_conn->login_desc);
896 sge.length = ISER_RX_PAYLOAD_SIZE;
897 sge.lkey = isert_conn->device->pd->local_dma_lkey;
899 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
900 sge.addr, sge.length, sge.lkey);
902 isert_conn->login_desc->rx_cqe.done = isert_login_recv_done;
904 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
905 rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe;
906 rx_wr.sg_list = &sge;
909 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
911 isert_err("ib_post_recv() failed: %d\n", ret);
917 isert_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
920 struct isert_conn *isert_conn = conn->context;
921 struct isert_device *device = isert_conn->device;
922 struct ib_device *ib_dev = device->ib_device;
923 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
926 __isert_create_send_desc(device, tx_desc);
928 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
929 sizeof(struct iscsi_hdr));
931 isert_init_tx_hdrs(isert_conn, tx_desc);
934 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
936 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
937 length, DMA_TO_DEVICE);
939 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
941 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
942 length, DMA_TO_DEVICE);
944 tx_dsg->addr = isert_conn->login_rsp_dma;
945 tx_dsg->length = length;
946 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
947 tx_desc->num_sge = 2;
949 if (!login->login_failed) {
950 if (login->login_complete) {
951 ret = isert_alloc_rx_descriptors(isert_conn);
955 ret = isert_post_recvm(isert_conn,
956 ISERT_QP_MAX_RECV_DTOS);
960 /* Now we are in FULL_FEATURE phase */
961 mutex_lock(&isert_conn->mutex);
962 isert_conn->state = ISER_CONN_FULL_FEATURE;
963 mutex_unlock(&isert_conn->mutex);
967 ret = isert_login_post_recv(isert_conn);
972 ret = isert_login_post_send(isert_conn, tx_desc);
980 isert_rx_login_req(struct isert_conn *isert_conn)
982 struct iser_rx_desc *rx_desc = isert_conn->login_desc;
983 int rx_buflen = isert_conn->login_req_len;
984 struct iscsit_conn *conn = isert_conn->conn;
985 struct iscsi_login *login = conn->conn_login;
988 isert_info("conn %p\n", isert_conn);
990 WARN_ON_ONCE(!login);
992 if (login->first_request) {
993 struct iscsi_login_req *login_req =
994 (struct iscsi_login_req *)isert_get_iscsi_hdr(rx_desc);
996 * Setup the initial iscsi_login values from the leading
999 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1000 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1002 login->version_min = login_req->min_version;
1003 login->version_max = login_req->max_version;
1004 memcpy(login->isid, login_req->isid, 6);
1005 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1006 login->init_task_tag = login_req->itt;
1007 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1008 login->cid = be16_to_cpu(login_req->cid);
1009 login->tsih = be16_to_cpu(login_req->tsih);
1012 memcpy(&login->req[0], isert_get_iscsi_hdr(rx_desc), ISCSI_HDR_LEN);
1014 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1015 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1016 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1017 MAX_KEY_VALUE_PAIRS);
1018 memcpy(login->req_buf, isert_get_data(rx_desc), size);
1020 if (login->first_request) {
1021 complete(&isert_conn->login_comp);
1024 queue_delayed_work(isert_login_wq, &conn->login_work, 0);
1027 static struct iscsit_cmd
1028 *isert_allocate_cmd(struct iscsit_conn *conn, struct iser_rx_desc *rx_desc)
1030 struct isert_conn *isert_conn = conn->context;
1031 struct isert_cmd *isert_cmd;
1032 struct iscsit_cmd *cmd;
1034 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1036 isert_err("Unable to allocate iscsit_cmd + isert_cmd\n");
1039 isert_cmd = iscsit_priv_cmd(cmd);
1040 isert_cmd->conn = isert_conn;
1041 isert_cmd->iscsit_cmd = cmd;
1042 isert_cmd->rx_desc = rx_desc;
1048 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1049 struct isert_cmd *isert_cmd, struct iscsit_cmd *cmd,
1050 struct iser_rx_desc *rx_desc, unsigned char *buf)
1052 struct iscsit_conn *conn = isert_conn->conn;
1053 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1054 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1055 bool dump_payload = false;
1056 unsigned int data_len;
1058 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1062 imm_data = cmd->immediate_data;
1063 imm_data_len = cmd->first_burst_len;
1064 unsol_data = cmd->unsolicited_data;
1065 data_len = cmd->se_cmd.data_length;
1067 if (imm_data && imm_data_len == data_len)
1068 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1069 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1072 } else if (rc > 0) {
1073 dump_payload = true;
1080 if (imm_data_len != data_len) {
1081 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1082 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1083 isert_get_data(rx_desc), imm_data_len);
1084 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1085 sg_nents, imm_data_len);
1087 sg_init_table(&isert_cmd->sg, 1);
1088 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1089 cmd->se_cmd.t_data_nents = 1;
1090 sg_set_buf(&isert_cmd->sg, isert_get_data(rx_desc),
1092 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1096 cmd->write_data_done += imm_data_len;
1098 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1099 spin_lock_bh(&cmd->istate_lock);
1100 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1101 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1102 spin_unlock_bh(&cmd->istate_lock);
1106 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1108 if (!rc && !dump_payload && unsol_data)
1109 iscsit_set_unsolicited_dataout(cmd);
1110 else if (dump_payload && imm_data)
1111 target_put_sess_cmd(&cmd->se_cmd);
1117 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1118 struct iser_rx_desc *rx_desc, unsigned char *buf)
1120 struct scatterlist *sg_start;
1121 struct iscsit_conn *conn = isert_conn->conn;
1122 struct iscsit_cmd *cmd = NULL;
1123 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1124 u32 unsol_data_len = ntoh24(hdr->dlength);
1125 int rc, sg_nents, sg_off, page_off;
1127 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1133 * FIXME: Unexpected unsolicited_data out
1135 if (!cmd->unsolicited_data) {
1136 isert_err("Received unexpected solicited data payload\n");
1141 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1142 "write_data_done: %u, data_length: %u\n",
1143 unsol_data_len, cmd->write_data_done,
1144 cmd->se_cmd.data_length);
1146 sg_off = cmd->write_data_done / PAGE_SIZE;
1147 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149 page_off = cmd->write_data_done % PAGE_SIZE;
1151 * FIXME: Non page-aligned unsolicited_data out
1154 isert_err("unexpected non-page aligned data payload\n");
1158 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1159 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1160 sg_nents, isert_get_data(rx_desc), unsol_data_len);
1162 sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),
1165 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1170 * multiple data-outs on the same command can arrive -
1171 * so post the buffer before hand
1173 return isert_post_recv(isert_conn, rx_desc);
1177 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1178 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1181 struct iscsit_conn *conn = isert_conn->conn;
1182 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1185 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1189 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1192 return iscsit_process_nop_out(conn, cmd, hdr);
1196 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1197 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1198 struct iscsi_text *hdr)
1200 struct iscsit_conn *conn = isert_conn->conn;
1201 u32 payload_length = ntoh24(hdr->dlength);
1203 unsigned char *text_in = NULL;
1205 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1209 if (payload_length) {
1210 text_in = kzalloc(payload_length, GFP_KERNEL);
1214 cmd->text_in_ptr = text_in;
1216 memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), payload_length);
1218 return iscsit_process_text_cmd(conn, cmd, hdr);
1222 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1223 uint32_t read_stag, uint64_t read_va,
1224 uint32_t write_stag, uint64_t write_va)
1226 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1227 struct iscsit_conn *conn = isert_conn->conn;
1228 struct iscsit_cmd *cmd;
1229 struct isert_cmd *isert_cmd;
1231 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1233 if (conn->sess->sess_ops->SessionType &&
1234 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1235 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1236 " ignoring\n", opcode);
1241 case ISCSI_OP_SCSI_CMD:
1242 cmd = isert_allocate_cmd(conn, rx_desc);
1246 isert_cmd = iscsit_priv_cmd(cmd);
1247 isert_cmd->read_stag = read_stag;
1248 isert_cmd->read_va = read_va;
1249 isert_cmd->write_stag = write_stag;
1250 isert_cmd->write_va = write_va;
1251 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1253 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1254 rx_desc, (unsigned char *)hdr);
1256 case ISCSI_OP_NOOP_OUT:
1257 cmd = isert_allocate_cmd(conn, rx_desc);
1261 isert_cmd = iscsit_priv_cmd(cmd);
1262 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1263 rx_desc, (unsigned char *)hdr);
1265 case ISCSI_OP_SCSI_DATA_OUT:
1266 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1267 (unsigned char *)hdr);
1269 case ISCSI_OP_SCSI_TMFUNC:
1270 cmd = isert_allocate_cmd(conn, rx_desc);
1274 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1275 (unsigned char *)hdr);
1277 case ISCSI_OP_LOGOUT:
1278 cmd = isert_allocate_cmd(conn, rx_desc);
1282 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1285 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1286 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1288 cmd = isert_allocate_cmd(conn, rx_desc);
1293 isert_cmd = iscsit_priv_cmd(cmd);
1294 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1295 rx_desc, (struct iscsi_text *)hdr);
1298 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1307 isert_print_wc(struct ib_wc *wc, const char *type)
1309 if (wc->status != IB_WC_WR_FLUSH_ERR)
1310 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1311 ib_wc_status_msg(wc->status), wc->status,
1314 isert_dbg("%s failure: %s (%d)\n", type,
1315 ib_wc_status_msg(wc->status), wc->status);
1319 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1321 struct isert_conn *isert_conn = wc->qp->qp_context;
1322 struct ib_device *ib_dev = isert_conn->cm_id->device;
1323 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1324 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1325 struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(rx_desc);
1326 uint64_t read_va = 0, write_va = 0;
1327 uint32_t read_stag = 0, write_stag = 0;
1329 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1330 isert_print_wc(wc, "recv");
1331 if (wc->status != IB_WC_WR_FLUSH_ERR)
1332 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1336 rx_desc->in_use = true;
1338 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1339 ISER_RX_SIZE, DMA_FROM_DEVICE);
1341 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1342 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1343 (int)(wc->byte_len - ISER_HEADERS_LEN));
1345 switch (iser_ctrl->flags & 0xF0) {
1347 if (iser_ctrl->flags & ISER_RSV) {
1348 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1349 read_va = be64_to_cpu(iser_ctrl->read_va);
1350 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1351 read_stag, (unsigned long long)read_va);
1353 if (iser_ctrl->flags & ISER_WSV) {
1354 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1355 write_va = be64_to_cpu(iser_ctrl->write_va);
1356 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1357 write_stag, (unsigned long long)write_va);
1360 isert_dbg("ISER ISCSI_CTRL PDU\n");
1363 isert_err("iSER Hello message\n");
1366 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1370 isert_rx_opcode(isert_conn, rx_desc,
1371 read_stag, read_va, write_stag, write_va);
1373 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1374 ISER_RX_SIZE, DMA_FROM_DEVICE);
1378 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1380 struct isert_conn *isert_conn = wc->qp->qp_context;
1381 struct ib_device *ib_dev = isert_conn->device->ib_device;
1383 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384 isert_print_wc(wc, "login recv");
1388 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_desc->dma_addr,
1389 ISER_RX_SIZE, DMA_FROM_DEVICE);
1391 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1393 if (isert_conn->conn) {
1394 struct iscsi_login *login = isert_conn->conn->conn_login;
1396 if (login && !login->first_request)
1397 isert_rx_login_req(isert_conn);
1400 mutex_lock(&isert_conn->mutex);
1401 complete(&isert_conn->login_req_comp);
1402 mutex_unlock(&isert_conn->mutex);
1404 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_desc->dma_addr,
1405 ISER_RX_SIZE, DMA_FROM_DEVICE);
1409 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1411 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
1412 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1414 if (!cmd->rw.nr_ops)
1417 if (isert_prot_cmd(conn, se_cmd)) {
1418 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1419 conn->cm_id->port_num, se_cmd->t_data_sg,
1420 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1421 se_cmd->t_prot_nents, dir);
1423 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1424 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1431 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1433 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1434 struct isert_conn *isert_conn = isert_cmd->conn;
1435 struct iscsit_conn *conn = isert_conn->conn;
1436 struct iscsi_text_rsp *hdr;
1438 isert_dbg("Cmd %p\n", isert_cmd);
1440 switch (cmd->iscsi_opcode) {
1441 case ISCSI_OP_SCSI_CMD:
1442 spin_lock_bh(&conn->cmd_lock);
1443 if (!list_empty(&cmd->i_conn_node))
1444 list_del_init(&cmd->i_conn_node);
1445 spin_unlock_bh(&conn->cmd_lock);
1447 if (cmd->data_direction == DMA_TO_DEVICE) {
1448 iscsit_stop_dataout_timer(cmd);
1450 * Check for special case during comp_err where
1451 * WRITE_PENDING has been handed off from core,
1452 * but requires an extra target_put_sess_cmd()
1453 * before transport_generic_free_cmd() below.
1456 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1457 struct se_cmd *se_cmd = &cmd->se_cmd;
1459 target_put_sess_cmd(se_cmd);
1463 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1464 transport_generic_free_cmd(&cmd->se_cmd, 0);
1466 case ISCSI_OP_SCSI_TMFUNC:
1467 spin_lock_bh(&conn->cmd_lock);
1468 if (!list_empty(&cmd->i_conn_node))
1469 list_del_init(&cmd->i_conn_node);
1470 spin_unlock_bh(&conn->cmd_lock);
1472 transport_generic_free_cmd(&cmd->se_cmd, 0);
1474 case ISCSI_OP_REJECT:
1475 case ISCSI_OP_NOOP_OUT:
1477 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1478 /* If the continue bit is on, keep the command alive */
1479 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1482 spin_lock_bh(&conn->cmd_lock);
1483 if (!list_empty(&cmd->i_conn_node))
1484 list_del_init(&cmd->i_conn_node);
1485 spin_unlock_bh(&conn->cmd_lock);
1488 * Handle special case for REJECT when iscsi_add_reject*() has
1489 * overwritten the original iscsi_opcode assignment, and the
1490 * associated cmd->se_cmd needs to be released.
1492 if (cmd->se_cmd.se_tfo != NULL) {
1493 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1495 transport_generic_free_cmd(&cmd->se_cmd, 0);
1500 iscsit_release_cmd(cmd);
1506 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1508 if (tx_desc->dma_addr != 0) {
1509 isert_dbg("unmap single for tx_desc->dma_addr\n");
1510 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1511 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1512 tx_desc->dma_addr = 0;
1517 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1518 struct ib_device *ib_dev, bool comp_err)
1520 if (isert_cmd->pdu_buf_dma != 0) {
1521 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1522 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1523 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1524 isert_cmd->pdu_buf_dma = 0;
1527 isert_unmap_tx_desc(tx_desc, ib_dev);
1528 isert_put_cmd(isert_cmd, comp_err);
1532 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1534 struct ib_mr_status mr_status;
1537 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1539 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1540 goto fail_mr_status;
1543 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1545 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1547 switch (mr_status.sig_err.err_type) {
1548 case IB_SIG_BAD_GUARD:
1549 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1551 case IB_SIG_BAD_REFTAG:
1552 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1554 case IB_SIG_BAD_APPTAG:
1555 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1558 sec_offset_err = mr_status.sig_err.sig_err_offset;
1559 do_div(sec_offset_err, block_size);
1560 se_cmd->sense_info = sec_offset_err + se_cmd->t_task_lba;
1562 isert_err("PI error found type %d at sector 0x%llx "
1563 "expected 0x%x vs actual 0x%x\n",
1564 mr_status.sig_err.err_type,
1565 (unsigned long long)se_cmd->sense_info,
1566 mr_status.sig_err.expected,
1567 mr_status.sig_err.actual);
1576 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1578 struct isert_conn *isert_conn = wc->qp->qp_context;
1579 struct isert_device *device = isert_conn->device;
1580 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1581 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1582 struct se_cmd *cmd = &isert_cmd->iscsit_cmd->se_cmd;
1585 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1586 isert_print_wc(wc, "rdma write");
1587 if (wc->status != IB_WC_WR_FLUSH_ERR)
1588 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1589 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1593 isert_dbg("Cmd %p\n", isert_cmd);
1595 ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr);
1596 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1600 * transport_generic_request_failure() expects to have
1601 * plus two references to handle queue-full, so re-add
1602 * one here as target-core will have already dropped
1603 * it after the first isert_put_datain() callback.
1605 kref_get(&cmd->cmd_kref);
1606 transport_generic_request_failure(cmd, cmd->pi_err);
1609 * XXX: isert_put_response() failure is not retried.
1611 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsit_cmd);
1613 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1618 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1620 struct isert_conn *isert_conn = wc->qp->qp_context;
1621 struct isert_device *device = isert_conn->device;
1622 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1623 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1624 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1625 struct se_cmd *se_cmd = &cmd->se_cmd;
1628 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1629 isert_print_wc(wc, "rdma read");
1630 if (wc->status != IB_WC_WR_FLUSH_ERR)
1631 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1632 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1636 isert_dbg("Cmd %p\n", isert_cmd);
1638 iscsit_stop_dataout_timer(cmd);
1640 if (isert_prot_cmd(isert_conn, se_cmd))
1641 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
1642 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1643 cmd->write_data_done = 0;
1645 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1646 spin_lock_bh(&cmd->istate_lock);
1647 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649 spin_unlock_bh(&cmd->istate_lock);
1652 * transport_generic_request_failure() will drop the extra
1653 * se_cmd->cmd_kref reference after T10-PI error, and handle
1654 * any non-zero ->queue_status() callback error retries.
1657 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1659 target_execute_cmd(se_cmd);
1663 isert_do_control_comp(struct work_struct *work)
1665 struct isert_cmd *isert_cmd = container_of(work,
1666 struct isert_cmd, comp_work);
1667 struct isert_conn *isert_conn = isert_cmd->conn;
1668 struct ib_device *ib_dev = isert_conn->cm_id->device;
1669 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1671 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1673 switch (cmd->i_state) {
1674 case ISTATE_SEND_TASKMGTRSP:
1675 iscsit_tmr_post_handler(cmd, cmd->conn);
1677 case ISTATE_SEND_REJECT:
1678 case ISTATE_SEND_TEXTRSP:
1679 cmd->i_state = ISTATE_SENT_STATUS;
1680 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1683 case ISTATE_SEND_LOGOUTRSP:
1684 iscsit_logout_post_handler(cmd, cmd->conn);
1687 isert_err("Unknown i_state %d\n", cmd->i_state);
1694 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1696 struct isert_conn *isert_conn = wc->qp->qp_context;
1697 struct ib_device *ib_dev = isert_conn->cm_id->device;
1698 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1700 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1701 isert_print_wc(wc, "login send");
1702 if (wc->status != IB_WC_WR_FLUSH_ERR)
1703 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1706 isert_unmap_tx_desc(tx_desc, ib_dev);
1710 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1712 struct isert_conn *isert_conn = wc->qp->qp_context;
1713 struct ib_device *ib_dev = isert_conn->cm_id->device;
1714 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1715 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1717 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1718 isert_print_wc(wc, "send");
1719 if (wc->status != IB_WC_WR_FLUSH_ERR)
1720 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1721 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1725 isert_dbg("Cmd %p\n", isert_cmd);
1727 switch (isert_cmd->iscsit_cmd->i_state) {
1728 case ISTATE_SEND_TASKMGTRSP:
1729 case ISTATE_SEND_LOGOUTRSP:
1730 case ISTATE_SEND_REJECT:
1731 case ISTATE_SEND_TEXTRSP:
1732 isert_unmap_tx_desc(tx_desc, ib_dev);
1734 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1735 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1738 isert_cmd->iscsit_cmd->i_state = ISTATE_SENT_STATUS;
1739 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1745 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1749 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1753 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1755 isert_err("ib_post_send failed with %d\n", ret);
1762 isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1764 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1765 struct isert_conn *isert_conn = conn->context;
1766 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1767 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1768 &isert_cmd->tx_desc.iscsi_header;
1770 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1771 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1772 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1774 * Attach SENSE DATA payload to iSCSI Response PDU
1776 if (cmd->se_cmd.sense_buffer &&
1777 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1778 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1779 struct isert_device *device = isert_conn->device;
1780 struct ib_device *ib_dev = device->ib_device;
1781 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1782 u32 padding, pdu_len;
1784 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1786 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1788 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1789 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1790 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1792 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1793 (void *)cmd->sense_buffer, pdu_len,
1795 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1798 isert_cmd->pdu_buf_len = pdu_len;
1799 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1800 tx_dsg->length = pdu_len;
1801 tx_dsg->lkey = device->pd->local_dma_lkey;
1802 isert_cmd->tx_desc.num_sge = 2;
1805 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1807 isert_dbg("Posting SCSI Response\n");
1809 return isert_post_response(isert_conn, isert_cmd);
1813 isert_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1815 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1816 struct isert_conn *isert_conn = conn->context;
1818 spin_lock_bh(&conn->cmd_lock);
1819 if (!list_empty(&cmd->i_conn_node))
1820 list_del_init(&cmd->i_conn_node);
1821 spin_unlock_bh(&conn->cmd_lock);
1823 if (cmd->data_direction == DMA_TO_DEVICE)
1824 iscsit_stop_dataout_timer(cmd);
1825 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1828 static enum target_prot_op
1829 isert_get_sup_prot_ops(struct iscsit_conn *conn)
1831 struct isert_conn *isert_conn = conn->context;
1832 struct isert_device *device = isert_conn->device;
1834 if (conn->tpg->tpg_attrib.t10_pi) {
1835 if (device->pi_capable) {
1836 isert_info("conn %p PI offload enabled\n", isert_conn);
1837 isert_conn->pi_support = true;
1838 return TARGET_PROT_ALL;
1842 isert_info("conn %p PI offload disabled\n", isert_conn);
1843 isert_conn->pi_support = false;
1845 return TARGET_PROT_NORMAL;
1849 isert_put_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
1850 bool nopout_response)
1852 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1853 struct isert_conn *isert_conn = conn->context;
1854 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1856 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1857 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1858 &isert_cmd->tx_desc.iscsi_header,
1860 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1861 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1863 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1865 return isert_post_response(isert_conn, isert_cmd);
1869 isert_put_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1871 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1872 struct isert_conn *isert_conn = conn->context;
1873 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1875 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1876 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1877 &isert_cmd->tx_desc.iscsi_header);
1878 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1879 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1881 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1883 return isert_post_response(isert_conn, isert_cmd);
1887 isert_put_tm_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1889 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1890 struct isert_conn *isert_conn = conn->context;
1891 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1893 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1894 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1895 &isert_cmd->tx_desc.iscsi_header);
1896 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1897 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1899 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1901 return isert_post_response(isert_conn, isert_cmd);
1905 isert_put_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1907 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1908 struct isert_conn *isert_conn = conn->context;
1909 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1910 struct isert_device *device = isert_conn->device;
1911 struct ib_device *ib_dev = device->ib_device;
1912 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1913 struct iscsi_reject *hdr =
1914 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1916 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1917 iscsit_build_reject(cmd, conn, hdr);
1918 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1920 hton24(hdr->dlength, ISCSI_HDR_LEN);
1921 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1922 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1924 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1926 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1927 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1928 tx_dsg->length = ISCSI_HDR_LEN;
1929 tx_dsg->lkey = device->pd->local_dma_lkey;
1930 isert_cmd->tx_desc.num_sge = 2;
1932 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1934 isert_dbg("conn %p Posting Reject\n", isert_conn);
1936 return isert_post_response(isert_conn, isert_cmd);
1940 isert_put_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1942 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1943 struct isert_conn *isert_conn = conn->context;
1944 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1945 struct iscsi_text_rsp *hdr =
1946 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1950 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1951 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1956 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1959 struct isert_device *device = isert_conn->device;
1960 struct ib_device *ib_dev = device->ib_device;
1961 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1962 void *txt_rsp_buf = cmd->buf_ptr;
1964 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1965 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1966 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1969 isert_cmd->pdu_buf_len = txt_rsp_len;
1970 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1971 tx_dsg->length = txt_rsp_len;
1972 tx_dsg->lkey = device->pd->local_dma_lkey;
1973 isert_cmd->tx_desc.num_sge = 2;
1975 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1977 isert_dbg("conn %p Text Response\n", isert_conn);
1979 return isert_post_response(isert_conn, isert_cmd);
1983 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
1985 domain->sig_type = IB_SIG_TYPE_T10_DIF;
1986 domain->sig.dif.bg_type = IB_T10DIF_CRC;
1987 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
1988 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
1990 * At the moment we hard code those, but if in the future
1991 * the target core would like to use it, we will take it
1994 domain->sig.dif.apptag_check_mask = 0xffff;
1995 domain->sig.dif.app_escape = true;
1996 domain->sig.dif.ref_escape = true;
1997 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
1998 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
1999 domain->sig.dif.ref_remap = true;
2003 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2005 memset(sig_attrs, 0, sizeof(*sig_attrs));
2007 switch (se_cmd->prot_op) {
2008 case TARGET_PROT_DIN_INSERT:
2009 case TARGET_PROT_DOUT_STRIP:
2010 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2011 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2013 case TARGET_PROT_DOUT_INSERT:
2014 case TARGET_PROT_DIN_STRIP:
2015 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2016 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2018 case TARGET_PROT_DIN_PASS:
2019 case TARGET_PROT_DOUT_PASS:
2020 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2021 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2024 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2028 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2029 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2030 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2031 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2032 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2033 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2039 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2040 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2042 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
2043 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2044 u8 port_num = conn->cm_id->port_num;
2049 if (cmd->ctx_init_done)
2052 if (dir == DMA_FROM_DEVICE) {
2053 addr = cmd->write_va;
2054 rkey = cmd->write_stag;
2055 offset = cmd->iscsit_cmd->write_data_done;
2057 addr = cmd->read_va;
2058 rkey = cmd->read_stag;
2062 if (isert_prot_cmd(conn, se_cmd)) {
2063 struct ib_sig_attrs sig_attrs;
2065 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2069 WARN_ON_ONCE(offset);
2070 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2071 se_cmd->t_data_sg, se_cmd->t_data_nents,
2072 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2073 &sig_attrs, addr, rkey, dir);
2075 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2076 se_cmd->t_data_sg, se_cmd->t_data_nents,
2077 offset, addr, rkey, dir);
2081 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2085 cmd->ctx_init_done = true;
2088 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2090 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2095 isert_put_datain(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
2097 struct se_cmd *se_cmd = &cmd->se_cmd;
2098 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2099 struct isert_conn *isert_conn = conn->context;
2100 struct ib_cqe *cqe = NULL;
2101 struct ib_send_wr *chain_wr = NULL;
2104 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2105 isert_cmd, se_cmd->data_length);
2107 if (isert_prot_cmd(isert_conn, se_cmd)) {
2108 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2109 cqe = &isert_cmd->tx_desc.tx_cqe;
2112 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2114 isert_create_send_desc(isert_conn, isert_cmd,
2115 &isert_cmd->tx_desc);
2116 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2117 &isert_cmd->tx_desc.iscsi_header);
2118 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2119 isert_init_send_wr(isert_conn, isert_cmd,
2120 &isert_cmd->tx_desc.send_wr);
2122 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2126 chain_wr = &isert_cmd->tx_desc.send_wr;
2129 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2130 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2136 isert_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, bool recovery)
2138 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2141 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2142 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2144 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2145 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2146 &isert_cmd->tx_desc.tx_cqe, NULL);
2148 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2154 isert_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2156 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2161 spin_lock_bh(&conn->cmd_lock);
2162 list_del_init(&cmd->i_conn_node);
2163 spin_unlock_bh(&conn->cmd_lock);
2164 isert_put_cmd(isert_cmd, true);
2166 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2167 ret = isert_put_nopin(cmd, conn, false);
2170 isert_err("Unknown immediate state: 0x%02x\n", state);
2179 isert_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2181 struct isert_conn *isert_conn = conn->context;
2185 case ISTATE_SEND_LOGOUTRSP:
2186 ret = isert_put_logout_rsp(cmd, conn);
2188 isert_conn->logout_posted = true;
2190 case ISTATE_SEND_NOPIN:
2191 ret = isert_put_nopin(cmd, conn, true);
2193 case ISTATE_SEND_TASKMGTRSP:
2194 ret = isert_put_tm_rsp(cmd, conn);
2196 case ISTATE_SEND_REJECT:
2197 ret = isert_put_reject(cmd, conn);
2199 case ISTATE_SEND_TEXTRSP:
2200 ret = isert_put_text_rsp(cmd, conn);
2202 case ISTATE_SEND_STATUS:
2204 * Special case for sending non GOOD SCSI status from TX thread
2205 * context during pre se_cmd excecution failure.
2207 ret = isert_put_response(conn, cmd);
2210 isert_err("Unknown response state: 0x%02x\n", state);
2219 isert_setup_id(struct isert_np *isert_np)
2221 struct iscsi_np *np = isert_np->np;
2222 struct rdma_cm_id *id;
2223 struct sockaddr *sa;
2226 sa = (struct sockaddr *)&np->np_sockaddr;
2227 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2229 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2230 RDMA_PS_TCP, IB_QPT_RC);
2232 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2236 isert_dbg("id %p context %p\n", id, id->context);
2239 * Allow both IPv4 and IPv6 sockets to bind a single port
2242 ret = rdma_set_afonly(id, 1);
2244 isert_err("rdma_set_afonly() failed: %d\n", ret);
2248 ret = rdma_bind_addr(id, sa);
2250 isert_err("rdma_bind_addr() failed: %d\n", ret);
2254 ret = rdma_listen(id, 0);
2256 isert_err("rdma_listen() failed: %d\n", ret);
2262 rdma_destroy_id(id);
2264 return ERR_PTR(ret);
2268 isert_setup_np(struct iscsi_np *np,
2269 struct sockaddr_storage *ksockaddr)
2271 struct isert_np *isert_np;
2272 struct rdma_cm_id *isert_lid;
2275 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2279 sema_init(&isert_np->sem, 0);
2280 mutex_init(&isert_np->mutex);
2281 INIT_LIST_HEAD(&isert_np->accepted);
2282 INIT_LIST_HEAD(&isert_np->pending);
2286 * Setup the np->np_sockaddr from the passed sockaddr setup
2287 * in iscsi_target_configfs.c code..
2289 memcpy(&np->np_sockaddr, ksockaddr,
2290 sizeof(struct sockaddr_storage));
2292 isert_lid = isert_setup_id(isert_np);
2293 if (IS_ERR(isert_lid)) {
2294 ret = PTR_ERR(isert_lid);
2298 isert_np->cm_id = isert_lid;
2299 np->np_context = isert_np;
2310 isert_rdma_accept(struct isert_conn *isert_conn)
2312 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2313 struct rdma_conn_param cp;
2315 struct iser_cm_hdr rsp_hdr;
2317 memset(&cp, 0, sizeof(struct rdma_conn_param));
2318 cp.initiator_depth = isert_conn->initiator_depth;
2320 cp.rnr_retry_count = 7;
2322 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2323 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2324 if (!isert_conn->snd_w_inv)
2325 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2326 cp.private_data = (void *)&rsp_hdr;
2327 cp.private_data_len = sizeof(rsp_hdr);
2329 ret = rdma_accept(cm_id, &cp);
2331 isert_err("rdma_accept() failed with: %d\n", ret);
2339 isert_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
2341 struct isert_conn *isert_conn = conn->context;
2344 isert_info("before login_req comp conn: %p\n", isert_conn);
2345 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2347 isert_err("isert_conn %p interrupted before got login req\n",
2351 reinit_completion(&isert_conn->login_req_comp);
2354 * For login requests after the first PDU, isert_rx_login_req() will
2355 * kick queue_delayed_work(isert_login_wq, &conn->login_work) as
2356 * the packet is received, which turns this callback from
2357 * iscsi_target_do_login_rx() into a NOP.
2359 if (!login->first_request)
2362 isert_rx_login_req(isert_conn);
2364 isert_info("before login_comp conn: %p\n", conn);
2365 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2369 isert_info("processing login->req: %p\n", login->req);
2375 isert_set_conn_info(struct iscsi_np *np, struct iscsit_conn *conn,
2376 struct isert_conn *isert_conn)
2378 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2379 struct rdma_route *cm_route = &cm_id->route;
2381 conn->login_family = np->np_sockaddr.ss_family;
2383 conn->login_sockaddr = cm_route->addr.dst_addr;
2384 conn->local_sockaddr = cm_route->addr.src_addr;
2388 isert_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
2390 struct isert_np *isert_np = np->np_context;
2391 struct isert_conn *isert_conn;
2395 ret = down_interruptible(&isert_np->sem);
2399 spin_lock_bh(&np->np_thread_lock);
2400 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2401 spin_unlock_bh(&np->np_thread_lock);
2402 isert_dbg("np_thread_state %d\n",
2403 np->np_thread_state);
2405 * No point in stalling here when np_thread
2406 * is in state RESET/SHUTDOWN/EXIT - bail
2410 spin_unlock_bh(&np->np_thread_lock);
2412 mutex_lock(&isert_np->mutex);
2413 if (list_empty(&isert_np->pending)) {
2414 mutex_unlock(&isert_np->mutex);
2417 isert_conn = list_first_entry(&isert_np->pending,
2418 struct isert_conn, node);
2419 list_del_init(&isert_conn->node);
2420 mutex_unlock(&isert_np->mutex);
2422 conn->context = isert_conn;
2423 isert_conn->conn = conn;
2424 isert_conn->state = ISER_CONN_BOUND;
2426 isert_set_conn_info(np, conn, isert_conn);
2428 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2434 isert_free_np(struct iscsi_np *np)
2436 struct isert_np *isert_np = np->np_context;
2437 struct isert_conn *isert_conn, *n;
2438 LIST_HEAD(drop_conn_list);
2440 if (isert_np->cm_id)
2441 rdma_destroy_id(isert_np->cm_id);
2444 * FIXME: At this point we don't have a good way to insure
2445 * that at this point we don't have hanging connections that
2446 * completed RDMA establishment but didn't start iscsi login
2447 * process. So work-around this by cleaning up what ever piled
2448 * up in accepted and pending lists.
2450 mutex_lock(&isert_np->mutex);
2451 if (!list_empty(&isert_np->pending)) {
2452 isert_info("Still have isert pending connections\n");
2453 list_for_each_entry_safe(isert_conn, n,
2456 isert_info("cleaning isert_conn %p state (%d)\n",
2457 isert_conn, isert_conn->state);
2458 list_move_tail(&isert_conn->node, &drop_conn_list);
2462 if (!list_empty(&isert_np->accepted)) {
2463 isert_info("Still have isert accepted connections\n");
2464 list_for_each_entry_safe(isert_conn, n,
2465 &isert_np->accepted,
2467 isert_info("cleaning isert_conn %p state (%d)\n",
2468 isert_conn, isert_conn->state);
2469 list_move_tail(&isert_conn->node, &drop_conn_list);
2472 mutex_unlock(&isert_np->mutex);
2474 list_for_each_entry_safe(isert_conn, n, &drop_conn_list, node) {
2475 list_del_init(&isert_conn->node);
2476 isert_connect_release(isert_conn);
2479 np->np_context = NULL;
2483 static void isert_release_work(struct work_struct *work)
2485 struct isert_conn *isert_conn = container_of(work,
2489 isert_info("Starting release conn %p\n", isert_conn);
2491 mutex_lock(&isert_conn->mutex);
2492 isert_conn->state = ISER_CONN_DOWN;
2493 mutex_unlock(&isert_conn->mutex);
2495 isert_info("Destroying conn %p\n", isert_conn);
2496 isert_put_conn(isert_conn);
2500 isert_wait4logout(struct isert_conn *isert_conn)
2502 struct iscsit_conn *conn = isert_conn->conn;
2504 isert_info("conn %p\n", isert_conn);
2506 if (isert_conn->logout_posted) {
2507 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2508 wait_for_completion_timeout(&conn->conn_logout_comp,
2509 SECONDS_FOR_LOGOUT_COMP * HZ);
2514 isert_wait4cmds(struct iscsit_conn *conn)
2516 isert_info("iscsit_conn %p\n", conn);
2519 target_stop_cmd_counter(conn->cmd_cnt);
2520 target_wait_for_cmds(conn->cmd_cnt);
2525 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2526 * unsolicitate dataout
2527 * @conn: iscsi connection
2529 * We might still have commands that are waiting for unsolicited
2530 * dataouts messages. We must put the extra reference on those
2531 * before blocking on the target_wait_for_session_cmds
2534 isert_put_unsol_pending_cmds(struct iscsit_conn *conn)
2536 struct iscsit_cmd *cmd, *tmp;
2537 static LIST_HEAD(drop_cmd_list);
2539 spin_lock_bh(&conn->cmd_lock);
2540 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2541 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2542 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2543 (cmd->write_data_done < cmd->se_cmd.data_length))
2544 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2546 spin_unlock_bh(&conn->cmd_lock);
2548 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2549 list_del_init(&cmd->i_conn_node);
2550 if (cmd->i_state != ISTATE_REMOVE) {
2551 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2553 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2554 isert_put_cmd(isert_cmd, true);
2559 static void isert_wait_conn(struct iscsit_conn *conn)
2561 struct isert_conn *isert_conn = conn->context;
2563 isert_info("Starting conn %p\n", isert_conn);
2565 mutex_lock(&isert_conn->mutex);
2566 isert_conn_terminate(isert_conn);
2567 mutex_unlock(&isert_conn->mutex);
2569 ib_drain_qp(isert_conn->qp);
2570 isert_put_unsol_pending_cmds(conn);
2571 isert_wait4cmds(conn);
2572 isert_wait4logout(isert_conn);
2574 queue_work(isert_release_wq, &isert_conn->release_work);
2577 static void isert_free_conn(struct iscsit_conn *conn)
2579 struct isert_conn *isert_conn = conn->context;
2581 ib_drain_qp(isert_conn->qp);
2582 isert_put_conn(isert_conn);
2585 static void isert_get_rx_pdu(struct iscsit_conn *conn)
2587 struct completion comp;
2589 init_completion(&comp);
2591 wait_for_completion_interruptible(&comp);
2594 static struct iscsit_transport iser_target_transport = {
2596 .transport_type = ISCSI_INFINIBAND,
2597 .rdma_shutdown = true,
2598 .priv_size = sizeof(struct isert_cmd),
2599 .owner = THIS_MODULE,
2600 .iscsit_setup_np = isert_setup_np,
2601 .iscsit_accept_np = isert_accept_np,
2602 .iscsit_free_np = isert_free_np,
2603 .iscsit_wait_conn = isert_wait_conn,
2604 .iscsit_free_conn = isert_free_conn,
2605 .iscsit_get_login_rx = isert_get_login_rx,
2606 .iscsit_put_login_tx = isert_put_login_tx,
2607 .iscsit_immediate_queue = isert_immediate_queue,
2608 .iscsit_response_queue = isert_response_queue,
2609 .iscsit_get_dataout = isert_get_dataout,
2610 .iscsit_queue_data_in = isert_put_datain,
2611 .iscsit_queue_status = isert_put_response,
2612 .iscsit_aborted_task = isert_aborted_task,
2613 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2614 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2617 static int __init isert_init(void)
2619 isert_login_wq = alloc_workqueue("isert_login_wq", 0, 0);
2620 if (!isert_login_wq) {
2621 isert_err("Unable to allocate isert_login_wq\n");
2625 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2626 WQ_UNBOUND | WQ_HIGHPRI, 0);
2627 if (!isert_comp_wq) {
2628 isert_err("Unable to allocate isert_comp_wq\n");
2629 goto destroy_login_wq;
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");
2636 goto destroy_comp_wq;
2639 iscsit_register_transport(&iser_target_transport);
2640 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2645 destroy_workqueue(isert_comp_wq);
2647 destroy_workqueue(isert_login_wq);
2652 static void __exit isert_exit(void)
2654 flush_workqueue(isert_login_wq);
2655 destroy_workqueue(isert_release_wq);
2656 destroy_workqueue(isert_comp_wq);
2657 iscsit_unregister_transport(&iser_target_transport);
2658 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2659 destroy_workqueue(isert_login_wq);
2662 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2663 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2664 MODULE_LICENSE("GPL");
2666 module_init(isert_init);
2667 module_exit(isert_exit);