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>
32 #include "isert_proto.h"
35 #define ISERT_MAX_CONN 8
36 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
37 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * 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_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
53 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
54 struct isert_rdma_wr *wr);
56 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
58 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
59 struct isert_rdma_wr *wr);
61 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
63 isert_rdma_post_recvl(struct isert_conn *isert_conn);
65 isert_rdma_accept(struct isert_conn *isert_conn);
66 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
68 static void isert_release_work(struct work_struct *work);
69 static void isert_wait4flush(struct isert_conn *isert_conn);
72 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
74 return (conn->pi_support &&
75 cmd->prot_op != TARGET_PROT_NORMAL);
80 isert_qp_event_callback(struct ib_event *e, void *context)
82 struct isert_conn *isert_conn = context;
84 isert_err("%s (%d): conn %p\n",
85 ib_event_msg(e->event), e->event, isert_conn);
88 case IB_EVENT_COMM_EST:
89 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
91 case IB_EVENT_QP_LAST_WQE_REACHED:
92 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
100 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
104 ret = ib_query_device(ib_dev, devattr);
106 isert_err("ib_query_device() failed: %d\n", ret);
109 isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
110 isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
115 static struct isert_comp *
116 isert_comp_get(struct isert_conn *isert_conn)
118 struct isert_device *device = isert_conn->device;
119 struct isert_comp *comp;
122 mutex_lock(&device_list_mutex);
123 for (i = 0; i < device->comps_used; i++)
124 if (device->comps[i].active_qps <
125 device->comps[min].active_qps)
127 comp = &device->comps[min];
129 mutex_unlock(&device_list_mutex);
131 isert_info("conn %p, using comp %p min_index: %d\n",
132 isert_conn, comp, min);
138 isert_comp_put(struct isert_comp *comp)
140 mutex_lock(&device_list_mutex);
142 mutex_unlock(&device_list_mutex);
145 static struct ib_qp *
146 isert_create_qp(struct isert_conn *isert_conn,
147 struct isert_comp *comp,
148 struct rdma_cm_id *cma_id)
150 struct isert_device *device = isert_conn->device;
151 struct ib_qp_init_attr attr;
154 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
155 attr.event_handler = isert_qp_event_callback;
156 attr.qp_context = isert_conn;
157 attr.send_cq = comp->cq;
158 attr.recv_cq = comp->cq;
159 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
160 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
161 attr.cap.max_send_sge = device->dev_attr.max_sge;
162 isert_conn->max_sge = min(device->dev_attr.max_sge,
163 device->dev_attr.max_sge_rd);
164 attr.cap.max_recv_sge = 1;
165 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
166 attr.qp_type = IB_QPT_RC;
167 if (device->pi_capable)
168 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
170 ret = rdma_create_qp(cma_id, device->pd, &attr);
172 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
180 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
182 struct isert_comp *comp;
185 comp = isert_comp_get(isert_conn);
186 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
187 if (IS_ERR(isert_conn->qp)) {
188 ret = PTR_ERR(isert_conn->qp);
194 isert_comp_put(comp);
199 isert_cq_event_callback(struct ib_event *e, void *context)
201 isert_dbg("event: %d\n", e->event);
205 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
207 struct isert_device *device = isert_conn->device;
208 struct ib_device *ib_dev = device->ib_device;
209 struct iser_rx_desc *rx_desc;
210 struct ib_sge *rx_sg;
214 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
215 sizeof(struct iser_rx_desc), GFP_KERNEL);
216 if (!isert_conn->rx_descs)
219 rx_desc = isert_conn->rx_descs;
221 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
222 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
223 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
224 if (ib_dma_mapping_error(ib_dev, dma_addr))
227 rx_desc->dma_addr = dma_addr;
229 rx_sg = &rx_desc->rx_sg;
230 rx_sg->addr = rx_desc->dma_addr;
231 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
232 rx_sg->lkey = device->pd->local_dma_lkey;
238 rx_desc = isert_conn->rx_descs;
239 for (j = 0; j < i; j++, rx_desc++) {
240 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
241 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
243 kfree(isert_conn->rx_descs);
244 isert_conn->rx_descs = NULL;
246 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
252 isert_free_rx_descriptors(struct isert_conn *isert_conn)
254 struct ib_device *ib_dev = isert_conn->device->ib_device;
255 struct iser_rx_desc *rx_desc;
258 if (!isert_conn->rx_descs)
261 rx_desc = isert_conn->rx_descs;
262 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
263 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
264 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
267 kfree(isert_conn->rx_descs);
268 isert_conn->rx_descs = NULL;
271 static void isert_cq_work(struct work_struct *);
272 static void isert_cq_callback(struct ib_cq *, void *);
275 isert_free_comps(struct isert_device *device)
279 for (i = 0; i < device->comps_used; i++) {
280 struct isert_comp *comp = &device->comps[i];
283 cancel_work_sync(&comp->work);
284 ib_destroy_cq(comp->cq);
287 kfree(device->comps);
291 isert_alloc_comps(struct isert_device *device,
292 struct ib_device_attr *attr)
294 int i, max_cqe, ret = 0;
296 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
297 device->ib_device->num_comp_vectors));
299 isert_info("Using %d CQs, %s supports %d vectors support "
300 "Fast registration %d pi_capable %d\n",
301 device->comps_used, device->ib_device->name,
302 device->ib_device->num_comp_vectors, device->use_fastreg,
305 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
307 if (!device->comps) {
308 isert_err("Unable to allocate completion contexts\n");
312 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
314 for (i = 0; i < device->comps_used; i++) {
315 struct ib_cq_init_attr cq_attr = {};
316 struct isert_comp *comp = &device->comps[i];
318 comp->device = device;
319 INIT_WORK(&comp->work, isert_cq_work);
320 cq_attr.cqe = max_cqe;
321 cq_attr.comp_vector = i;
322 comp->cq = ib_create_cq(device->ib_device,
324 isert_cq_event_callback,
327 if (IS_ERR(comp->cq)) {
328 isert_err("Unable to allocate cq\n");
329 ret = PTR_ERR(comp->cq);
334 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
341 isert_free_comps(device);
346 isert_create_device_ib_res(struct isert_device *device)
348 struct ib_device_attr *dev_attr;
351 dev_attr = &device->dev_attr;
352 ret = isert_query_device(device->ib_device, dev_attr);
356 /* asign function handlers */
357 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
358 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
359 device->use_fastreg = 1;
360 device->reg_rdma_mem = isert_reg_rdma;
361 device->unreg_rdma_mem = isert_unreg_rdma;
363 device->use_fastreg = 0;
364 device->reg_rdma_mem = isert_map_rdma;
365 device->unreg_rdma_mem = isert_unmap_cmd;
368 ret = isert_alloc_comps(device, dev_attr);
372 device->pd = ib_alloc_pd(device->ib_device);
373 if (IS_ERR(device->pd)) {
374 ret = PTR_ERR(device->pd);
375 isert_err("failed to allocate pd, device %p, ret=%d\n",
380 /* Check signature cap */
381 device->pi_capable = dev_attr->device_cap_flags &
382 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
387 isert_free_comps(device);
392 isert_free_device_ib_res(struct isert_device *device)
394 isert_info("device %p\n", device);
396 ib_dealloc_pd(device->pd);
397 isert_free_comps(device);
401 isert_device_put(struct isert_device *device)
403 mutex_lock(&device_list_mutex);
405 isert_info("device %p refcount %d\n", device, device->refcount);
406 if (!device->refcount) {
407 isert_free_device_ib_res(device);
408 list_del(&device->dev_node);
411 mutex_unlock(&device_list_mutex);
414 static struct isert_device *
415 isert_device_get(struct rdma_cm_id *cma_id)
417 struct isert_device *device;
420 mutex_lock(&device_list_mutex);
421 list_for_each_entry(device, &device_list, dev_node) {
422 if (device->ib_device->node_guid == cma_id->device->node_guid) {
424 isert_info("Found iser device %p refcount %d\n",
425 device, device->refcount);
426 mutex_unlock(&device_list_mutex);
431 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
433 mutex_unlock(&device_list_mutex);
434 return ERR_PTR(-ENOMEM);
437 INIT_LIST_HEAD(&device->dev_node);
439 device->ib_device = cma_id->device;
440 ret = isert_create_device_ib_res(device);
443 mutex_unlock(&device_list_mutex);
448 list_add_tail(&device->dev_node, &device_list);
449 isert_info("Created a new iser device %p refcount %d\n",
450 device, device->refcount);
451 mutex_unlock(&device_list_mutex);
457 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
459 struct fast_reg_descriptor *fr_desc, *tmp;
462 if (list_empty(&isert_conn->fr_pool))
465 isert_info("Freeing conn %p fastreg pool", isert_conn);
467 list_for_each_entry_safe(fr_desc, tmp,
468 &isert_conn->fr_pool, list) {
469 list_del(&fr_desc->list);
470 ib_dereg_mr(fr_desc->data_mr);
471 if (fr_desc->pi_ctx) {
472 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
473 ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
474 kfree(fr_desc->pi_ctx);
480 if (i < isert_conn->fr_pool_size)
481 isert_warn("Pool still has %d regions registered\n",
482 isert_conn->fr_pool_size - i);
486 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
487 struct ib_device *device,
490 struct pi_context *pi_ctx;
493 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
495 isert_err("Failed to allocate pi context\n");
499 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
500 ISCSI_ISER_SG_TABLESIZE);
501 if (IS_ERR(pi_ctx->prot_mr)) {
502 isert_err("Failed to allocate prot frmr err=%ld\n",
503 PTR_ERR(pi_ctx->prot_mr));
504 ret = PTR_ERR(pi_ctx->prot_mr);
507 desc->ind |= ISERT_PROT_KEY_VALID;
509 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
510 if (IS_ERR(pi_ctx->sig_mr)) {
511 isert_err("Failed to allocate signature enabled mr err=%ld\n",
512 PTR_ERR(pi_ctx->sig_mr));
513 ret = PTR_ERR(pi_ctx->sig_mr);
517 desc->pi_ctx = pi_ctx;
518 desc->ind |= ISERT_SIG_KEY_VALID;
519 desc->ind &= ~ISERT_PROTECTED;
524 ib_dereg_mr(pi_ctx->prot_mr);
532 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
533 struct fast_reg_descriptor *fr_desc)
535 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
536 ISCSI_ISER_SG_TABLESIZE);
537 if (IS_ERR(fr_desc->data_mr)) {
538 isert_err("Failed to allocate data frmr err=%ld\n",
539 PTR_ERR(fr_desc->data_mr));
540 return PTR_ERR(fr_desc->data_mr);
542 fr_desc->ind |= ISERT_DATA_KEY_VALID;
544 isert_dbg("Created fr_desc %p\n", fr_desc);
550 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
552 struct fast_reg_descriptor *fr_desc;
553 struct isert_device *device = isert_conn->device;
554 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
555 struct se_node_acl *se_nacl = se_sess->se_node_acl;
558 * Setup the number of FRMRs based upon the number of tags
559 * available to session in iscsi_target_locate_portal().
561 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
562 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
564 isert_conn->fr_pool_size = 0;
565 for (i = 0; i < tag_num; i++) {
566 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
568 isert_err("Failed to allocate fast_reg descriptor\n");
573 ret = isert_create_fr_desc(device->ib_device,
574 device->pd, fr_desc);
576 isert_err("Failed to create fastreg descriptor err=%d\n",
582 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
583 isert_conn->fr_pool_size++;
586 isert_dbg("Creating conn %p fastreg pool size=%d",
587 isert_conn, isert_conn->fr_pool_size);
592 isert_conn_free_fastreg_pool(isert_conn);
597 isert_init_conn(struct isert_conn *isert_conn)
599 isert_conn->state = ISER_CONN_INIT;
600 INIT_LIST_HEAD(&isert_conn->node);
601 init_completion(&isert_conn->login_comp);
602 init_completion(&isert_conn->login_req_comp);
603 init_completion(&isert_conn->wait);
604 kref_init(&isert_conn->kref);
605 mutex_init(&isert_conn->mutex);
606 spin_lock_init(&isert_conn->pool_lock);
607 INIT_LIST_HEAD(&isert_conn->fr_pool);
608 INIT_WORK(&isert_conn->release_work, isert_release_work);
612 isert_free_login_buf(struct isert_conn *isert_conn)
614 struct ib_device *ib_dev = isert_conn->device->ib_device;
616 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
617 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
618 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
619 ISCSI_DEF_MAX_RECV_SEG_LEN,
621 kfree(isert_conn->login_buf);
625 isert_alloc_login_buf(struct isert_conn *isert_conn,
626 struct ib_device *ib_dev)
630 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
631 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
632 if (!isert_conn->login_buf) {
633 isert_err("Unable to allocate isert_conn->login_buf\n");
637 isert_conn->login_req_buf = isert_conn->login_buf;
638 isert_conn->login_rsp_buf = isert_conn->login_buf +
639 ISCSI_DEF_MAX_RECV_SEG_LEN;
641 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
642 isert_conn->login_buf, isert_conn->login_req_buf,
643 isert_conn->login_rsp_buf);
645 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
646 (void *)isert_conn->login_req_buf,
647 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
649 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
651 isert_err("login_req_dma mapping error: %d\n", ret);
652 isert_conn->login_req_dma = 0;
656 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
657 (void *)isert_conn->login_rsp_buf,
658 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
660 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
662 isert_err("login_rsp_dma mapping error: %d\n", ret);
663 isert_conn->login_rsp_dma = 0;
664 goto out_req_dma_map;
670 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
671 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
673 kfree(isert_conn->login_buf);
678 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
680 struct isert_np *isert_np = cma_id->context;
681 struct iscsi_np *np = isert_np->np;
682 struct isert_conn *isert_conn;
683 struct isert_device *device;
686 spin_lock_bh(&np->np_thread_lock);
688 spin_unlock_bh(&np->np_thread_lock);
689 isert_dbg("iscsi_np is not enabled, reject connect request\n");
690 return rdma_reject(cma_id, NULL, 0);
692 spin_unlock_bh(&np->np_thread_lock);
694 isert_dbg("cma_id: %p, portal: %p\n",
695 cma_id, cma_id->context);
697 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
701 isert_init_conn(isert_conn);
702 isert_conn->cm_id = cma_id;
704 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
708 device = isert_device_get(cma_id);
709 if (IS_ERR(device)) {
710 ret = PTR_ERR(device);
711 goto out_rsp_dma_map;
713 isert_conn->device = device;
715 /* Set max inflight RDMA READ requests */
716 isert_conn->initiator_depth = min_t(u8,
717 event->param.conn.initiator_depth,
718 device->dev_attr.max_qp_init_rd_atom);
719 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
721 ret = isert_conn_setup_qp(isert_conn, cma_id);
725 ret = isert_rdma_post_recvl(isert_conn);
729 ret = isert_rdma_accept(isert_conn);
733 mutex_lock(&isert_np->mutex);
734 list_add_tail(&isert_conn->node, &isert_np->accepted);
735 mutex_unlock(&isert_np->mutex);
740 isert_device_put(device);
742 isert_free_login_buf(isert_conn);
745 rdma_reject(cma_id, NULL, 0);
750 isert_connect_release(struct isert_conn *isert_conn)
752 struct isert_device *device = isert_conn->device;
754 isert_dbg("conn %p\n", isert_conn);
758 if (device->use_fastreg)
759 isert_conn_free_fastreg_pool(isert_conn);
761 isert_free_rx_descriptors(isert_conn);
762 if (isert_conn->cm_id)
763 rdma_destroy_id(isert_conn->cm_id);
765 if (isert_conn->qp) {
766 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
768 isert_comp_put(comp);
769 ib_destroy_qp(isert_conn->qp);
772 if (isert_conn->login_buf)
773 isert_free_login_buf(isert_conn);
775 isert_device_put(device);
781 isert_connected_handler(struct rdma_cm_id *cma_id)
783 struct isert_conn *isert_conn = cma_id->qp->qp_context;
784 struct isert_np *isert_np = cma_id->context;
786 isert_info("conn %p\n", isert_conn);
788 mutex_lock(&isert_conn->mutex);
789 isert_conn->state = ISER_CONN_UP;
790 kref_get(&isert_conn->kref);
791 mutex_unlock(&isert_conn->mutex);
793 mutex_lock(&isert_np->mutex);
794 list_move_tail(&isert_conn->node, &isert_np->pending);
795 mutex_unlock(&isert_np->mutex);
797 isert_info("np %p: Allow accept_np to continue\n", isert_np);
802 isert_release_kref(struct kref *kref)
804 struct isert_conn *isert_conn = container_of(kref,
805 struct isert_conn, kref);
807 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
810 isert_connect_release(isert_conn);
814 isert_put_conn(struct isert_conn *isert_conn)
816 kref_put(&isert_conn->kref, isert_release_kref);
820 isert_handle_unbound_conn(struct isert_conn *isert_conn)
822 struct isert_np *isert_np = isert_conn->cm_id->context;
824 mutex_lock(&isert_np->mutex);
825 if (!list_empty(&isert_conn->node)) {
827 * This means iscsi doesn't know this connection
828 * so schedule a cleanup ourselves
830 list_del_init(&isert_conn->node);
831 isert_put_conn(isert_conn);
832 complete(&isert_conn->wait);
833 queue_work(isert_release_wq, &isert_conn->release_work);
835 mutex_unlock(&isert_np->mutex);
839 * isert_conn_terminate() - Initiate connection termination
840 * @isert_conn: isert connection struct
843 * In case the connection state is BOUND, move state
844 * to TEMINATING and start teardown sequence (rdma_disconnect).
845 * In case the connection state is UP, complete flush as well.
847 * This routine must be called with mutex held. Thus it is
848 * safe to call multiple times.
851 isert_conn_terminate(struct isert_conn *isert_conn)
855 if (isert_conn->state >= ISER_CONN_TERMINATING)
858 isert_info("Terminating conn %p state %d\n",
859 isert_conn, isert_conn->state);
860 isert_conn->state = ISER_CONN_TERMINATING;
861 err = rdma_disconnect(isert_conn->cm_id);
863 isert_warn("Failed rdma_disconnect isert_conn %p\n",
866 isert_info("conn %p completing wait\n", isert_conn);
867 complete(&isert_conn->wait);
871 isert_np_cma_handler(struct isert_np *isert_np,
872 enum rdma_cm_event_type event)
874 isert_dbg("%s (%d): isert np %p\n",
875 rdma_event_msg(event), event, isert_np);
878 case RDMA_CM_EVENT_DEVICE_REMOVAL:
879 isert_np->cm_id = NULL;
881 case RDMA_CM_EVENT_ADDR_CHANGE:
882 isert_np->cm_id = isert_setup_id(isert_np);
883 if (IS_ERR(isert_np->cm_id)) {
884 isert_err("isert np %p setup id failed: %ld\n",
885 isert_np, PTR_ERR(isert_np->cm_id));
886 isert_np->cm_id = NULL;
890 isert_err("isert np %p Unexpected event %d\n",
898 isert_disconnected_handler(struct rdma_cm_id *cma_id,
899 enum rdma_cm_event_type event)
901 struct isert_conn *isert_conn = cma_id->qp->qp_context;
903 mutex_lock(&isert_conn->mutex);
904 switch (isert_conn->state) {
905 case ISER_CONN_TERMINATING:
908 isert_conn_terminate(isert_conn);
909 isert_wait4flush(isert_conn);
910 isert_handle_unbound_conn(isert_conn);
912 case ISER_CONN_BOUND:
913 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
914 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
917 isert_warn("conn %p teminating in state %d\n",
918 isert_conn, isert_conn->state);
920 mutex_unlock(&isert_conn->mutex);
926 isert_connect_error(struct rdma_cm_id *cma_id)
928 struct isert_conn *isert_conn = cma_id->qp->qp_context;
930 list_del_init(&isert_conn->node);
931 isert_conn->cm_id = NULL;
932 isert_put_conn(isert_conn);
938 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
940 struct isert_np *isert_np = cma_id->context;
943 isert_info("%s (%d): status %d id %p np %p\n",
944 rdma_event_msg(event->event), event->event,
945 event->status, cma_id, cma_id->context);
947 if (isert_np->cm_id == cma_id)
948 return isert_np_cma_handler(cma_id->context, event->event);
950 switch (event->event) {
951 case RDMA_CM_EVENT_CONNECT_REQUEST:
952 ret = isert_connect_request(cma_id, event);
954 isert_err("failed handle connect request %d\n", ret);
956 case RDMA_CM_EVENT_ESTABLISHED:
957 isert_connected_handler(cma_id);
959 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
960 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
961 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
962 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
963 ret = isert_disconnected_handler(cma_id, event->event);
965 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
966 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
967 case RDMA_CM_EVENT_CONNECT_ERROR:
968 ret = isert_connect_error(cma_id);
971 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
979 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
981 struct ib_recv_wr *rx_wr, *rx_wr_failed;
983 struct iser_rx_desc *rx_desc;
985 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
986 rx_desc = &isert_conn->rx_descs[i];
987 rx_wr->wr_id = (uintptr_t)rx_desc;
988 rx_wr->sg_list = &rx_desc->rx_sg;
990 rx_wr->next = rx_wr + 1;
993 rx_wr->next = NULL; /* mark end of work requests list */
995 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
998 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1004 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
1006 struct ib_recv_wr *rx_wr_failed, rx_wr;
1009 rx_wr.wr_id = (uintptr_t)rx_desc;
1010 rx_wr.sg_list = &rx_desc->rx_sg;
1014 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
1016 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1022 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1024 struct ib_device *ib_dev = isert_conn->cm_id->device;
1025 struct ib_send_wr send_wr, *send_wr_failed;
1028 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1029 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1031 send_wr.next = NULL;
1032 send_wr.wr_id = (uintptr_t)tx_desc;
1033 send_wr.sg_list = tx_desc->tx_sg;
1034 send_wr.num_sge = tx_desc->num_sge;
1035 send_wr.opcode = IB_WR_SEND;
1036 send_wr.send_flags = IB_SEND_SIGNALED;
1038 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1040 isert_err("ib_post_send() failed, ret: %d\n", ret);
1046 isert_create_send_desc(struct isert_conn *isert_conn,
1047 struct isert_cmd *isert_cmd,
1048 struct iser_tx_desc *tx_desc)
1050 struct isert_device *device = isert_conn->device;
1051 struct ib_device *ib_dev = device->ib_device;
1053 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1054 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1056 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1057 tx_desc->iser_header.flags = ISER_VER;
1059 tx_desc->num_sge = 1;
1060 tx_desc->isert_cmd = isert_cmd;
1062 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1063 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1064 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1069 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1070 struct iser_tx_desc *tx_desc)
1072 struct isert_device *device = isert_conn->device;
1073 struct ib_device *ib_dev = device->ib_device;
1076 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1077 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1078 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1079 isert_err("ib_dma_mapping_error() failed\n");
1083 tx_desc->dma_addr = dma_addr;
1084 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1085 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1086 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1088 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1089 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1090 tx_desc->tx_sg[0].lkey);
1096 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1097 struct ib_send_wr *send_wr)
1099 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1101 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1102 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1103 send_wr->opcode = IB_WR_SEND;
1104 send_wr->sg_list = &tx_desc->tx_sg[0];
1105 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1106 send_wr->send_flags = IB_SEND_SIGNALED;
1110 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1112 struct ib_recv_wr rx_wr, *rx_wr_fail;
1116 memset(&sge, 0, sizeof(struct ib_sge));
1117 sge.addr = isert_conn->login_req_dma;
1118 sge.length = ISER_RX_LOGIN_SIZE;
1119 sge.lkey = isert_conn->device->pd->local_dma_lkey;
1121 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1122 sge.addr, sge.length, sge.lkey);
1124 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1125 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1126 rx_wr.sg_list = &sge;
1129 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1131 isert_err("ib_post_recv() failed: %d\n", ret);
1137 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1140 struct isert_conn *isert_conn = conn->context;
1141 struct isert_device *device = isert_conn->device;
1142 struct ib_device *ib_dev = device->ib_device;
1143 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1146 isert_create_send_desc(isert_conn, NULL, tx_desc);
1148 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1149 sizeof(struct iscsi_hdr));
1151 isert_init_tx_hdrs(isert_conn, tx_desc);
1154 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1156 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1157 length, DMA_TO_DEVICE);
1159 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1161 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1162 length, DMA_TO_DEVICE);
1164 tx_dsg->addr = isert_conn->login_rsp_dma;
1165 tx_dsg->length = length;
1166 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1167 tx_desc->num_sge = 2;
1169 if (!login->login_failed) {
1170 if (login->login_complete) {
1171 if (!conn->sess->sess_ops->SessionType &&
1172 isert_conn->device->use_fastreg) {
1173 ret = isert_conn_create_fastreg_pool(isert_conn);
1175 isert_err("Conn: %p failed to create"
1176 " fastreg pool\n", isert_conn);
1181 ret = isert_alloc_rx_descriptors(isert_conn);
1185 ret = isert_post_recvm(isert_conn,
1186 ISERT_QP_MAX_RECV_DTOS);
1190 /* Now we are in FULL_FEATURE phase */
1191 mutex_lock(&isert_conn->mutex);
1192 isert_conn->state = ISER_CONN_FULL_FEATURE;
1193 mutex_unlock(&isert_conn->mutex);
1197 ret = isert_rdma_post_recvl(isert_conn);
1202 ret = isert_post_send(isert_conn, tx_desc);
1210 isert_rx_login_req(struct isert_conn *isert_conn)
1212 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1213 int rx_buflen = isert_conn->login_req_len;
1214 struct iscsi_conn *conn = isert_conn->conn;
1215 struct iscsi_login *login = conn->conn_login;
1218 isert_info("conn %p\n", isert_conn);
1220 WARN_ON_ONCE(!login);
1222 if (login->first_request) {
1223 struct iscsi_login_req *login_req =
1224 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1226 * Setup the initial iscsi_login values from the leading
1227 * login request PDU.
1229 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1230 login->current_stage =
1231 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1233 login->version_min = login_req->min_version;
1234 login->version_max = login_req->max_version;
1235 memcpy(login->isid, login_req->isid, 6);
1236 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1237 login->init_task_tag = login_req->itt;
1238 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1239 login->cid = be16_to_cpu(login_req->cid);
1240 login->tsih = be16_to_cpu(login_req->tsih);
1243 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1245 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1246 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1247 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1248 MAX_KEY_VALUE_PAIRS);
1249 memcpy(login->req_buf, &rx_desc->data[0], size);
1251 if (login->first_request) {
1252 complete(&isert_conn->login_comp);
1255 schedule_delayed_work(&conn->login_work, 0);
1258 static struct iscsi_cmd
1259 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1261 struct isert_conn *isert_conn = conn->context;
1262 struct isert_cmd *isert_cmd;
1263 struct iscsi_cmd *cmd;
1265 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1267 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1270 isert_cmd = iscsit_priv_cmd(cmd);
1271 isert_cmd->conn = isert_conn;
1272 isert_cmd->iscsi_cmd = cmd;
1273 isert_cmd->rx_desc = rx_desc;
1279 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1280 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1281 struct iser_rx_desc *rx_desc, unsigned char *buf)
1283 struct iscsi_conn *conn = isert_conn->conn;
1284 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1285 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1286 bool dump_payload = false;
1287 unsigned int data_len;
1289 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1293 imm_data = cmd->immediate_data;
1294 imm_data_len = cmd->first_burst_len;
1295 unsol_data = cmd->unsolicited_data;
1296 data_len = cmd->se_cmd.data_length;
1298 if (imm_data && imm_data_len == data_len)
1299 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1300 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1303 } else if (rc > 0) {
1304 dump_payload = true;
1311 if (imm_data_len != data_len) {
1312 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1313 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1314 &rx_desc->data[0], imm_data_len);
1315 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1316 sg_nents, imm_data_len);
1318 sg_init_table(&isert_cmd->sg, 1);
1319 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1320 cmd->se_cmd.t_data_nents = 1;
1321 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1322 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1326 cmd->write_data_done += imm_data_len;
1328 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1329 spin_lock_bh(&cmd->istate_lock);
1330 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1331 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1332 spin_unlock_bh(&cmd->istate_lock);
1336 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1338 if (!rc && dump_payload == false && unsol_data)
1339 iscsit_set_unsoliticed_dataout(cmd);
1340 else if (dump_payload && imm_data)
1341 target_put_sess_cmd(&cmd->se_cmd);
1347 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1348 struct iser_rx_desc *rx_desc, unsigned char *buf)
1350 struct scatterlist *sg_start;
1351 struct iscsi_conn *conn = isert_conn->conn;
1352 struct iscsi_cmd *cmd = NULL;
1353 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1354 u32 unsol_data_len = ntoh24(hdr->dlength);
1355 int rc, sg_nents, sg_off, page_off;
1357 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1363 * FIXME: Unexpected unsolicited_data out
1365 if (!cmd->unsolicited_data) {
1366 isert_err("Received unexpected solicited data payload\n");
1371 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1372 "write_data_done: %u, data_length: %u\n",
1373 unsol_data_len, cmd->write_data_done,
1374 cmd->se_cmd.data_length);
1376 sg_off = cmd->write_data_done / PAGE_SIZE;
1377 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1378 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1379 page_off = cmd->write_data_done % PAGE_SIZE;
1381 * FIXME: Non page-aligned unsolicited_data out
1384 isert_err("unexpected non-page aligned data payload\n");
1388 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1389 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1390 sg_nents, &rx_desc->data[0], unsol_data_len);
1392 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1395 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1400 * multiple data-outs on the same command can arrive -
1401 * so post the buffer before hand
1403 rc = isert_post_recv(isert_conn, rx_desc);
1405 isert_err("ib_post_recv failed with %d\n", rc);
1412 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1413 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1416 struct iscsi_conn *conn = isert_conn->conn;
1417 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1420 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1424 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1427 return iscsit_process_nop_out(conn, cmd, hdr);
1431 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1432 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1433 struct iscsi_text *hdr)
1435 struct iscsi_conn *conn = isert_conn->conn;
1436 u32 payload_length = ntoh24(hdr->dlength);
1438 unsigned char *text_in = NULL;
1440 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1444 if (payload_length) {
1445 text_in = kzalloc(payload_length, GFP_KERNEL);
1447 isert_err("Unable to allocate text_in of payload_length: %u\n",
1452 cmd->text_in_ptr = text_in;
1454 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1456 return iscsit_process_text_cmd(conn, cmd, hdr);
1460 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1461 uint32_t read_stag, uint64_t read_va,
1462 uint32_t write_stag, uint64_t write_va)
1464 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1465 struct iscsi_conn *conn = isert_conn->conn;
1466 struct iscsi_cmd *cmd;
1467 struct isert_cmd *isert_cmd;
1469 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1471 if (conn->sess->sess_ops->SessionType &&
1472 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1473 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1474 " ignoring\n", opcode);
1479 case ISCSI_OP_SCSI_CMD:
1480 cmd = isert_allocate_cmd(conn, rx_desc);
1484 isert_cmd = iscsit_priv_cmd(cmd);
1485 isert_cmd->read_stag = read_stag;
1486 isert_cmd->read_va = read_va;
1487 isert_cmd->write_stag = write_stag;
1488 isert_cmd->write_va = write_va;
1490 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1491 rx_desc, (unsigned char *)hdr);
1493 case ISCSI_OP_NOOP_OUT:
1494 cmd = isert_allocate_cmd(conn, rx_desc);
1498 isert_cmd = iscsit_priv_cmd(cmd);
1499 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1500 rx_desc, (unsigned char *)hdr);
1502 case ISCSI_OP_SCSI_DATA_OUT:
1503 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1504 (unsigned char *)hdr);
1506 case ISCSI_OP_SCSI_TMFUNC:
1507 cmd = isert_allocate_cmd(conn, rx_desc);
1511 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1512 (unsigned char *)hdr);
1514 case ISCSI_OP_LOGOUT:
1515 cmd = isert_allocate_cmd(conn, rx_desc);
1519 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1522 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1523 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1525 cmd = isert_allocate_cmd(conn, rx_desc);
1530 isert_cmd = iscsit_priv_cmd(cmd);
1531 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1532 rx_desc, (struct iscsi_text *)hdr);
1535 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1544 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1546 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1547 uint64_t read_va = 0, write_va = 0;
1548 uint32_t read_stag = 0, write_stag = 0;
1550 switch (iser_hdr->flags & 0xF0) {
1552 if (iser_hdr->flags & ISER_RSV) {
1553 read_stag = be32_to_cpu(iser_hdr->read_stag);
1554 read_va = be64_to_cpu(iser_hdr->read_va);
1555 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1556 read_stag, (unsigned long long)read_va);
1558 if (iser_hdr->flags & ISER_WSV) {
1559 write_stag = be32_to_cpu(iser_hdr->write_stag);
1560 write_va = be64_to_cpu(iser_hdr->write_va);
1561 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1562 write_stag, (unsigned long long)write_va);
1565 isert_dbg("ISER ISCSI_CTRL PDU\n");
1568 isert_err("iSER Hello message\n");
1571 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1575 isert_rx_opcode(isert_conn, rx_desc,
1576 read_stag, read_va, write_stag, write_va);
1580 isert_rcv_completion(struct iser_rx_desc *desc,
1581 struct isert_conn *isert_conn,
1584 struct ib_device *ib_dev = isert_conn->cm_id->device;
1585 struct iscsi_hdr *hdr;
1589 if ((char *)desc == isert_conn->login_req_buf) {
1590 rx_dma = isert_conn->login_req_dma;
1591 rx_buflen = ISER_RX_LOGIN_SIZE;
1592 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1595 rx_dma = desc->dma_addr;
1596 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1597 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1601 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1603 hdr = &desc->iscsi_header;
1604 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1605 hdr->opcode, hdr->itt, hdr->flags,
1606 (int)(xfer_len - ISER_HEADERS_LEN));
1608 if ((char *)desc == isert_conn->login_req_buf) {
1609 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1610 if (isert_conn->conn) {
1611 struct iscsi_login *login = isert_conn->conn->conn_login;
1613 if (login && !login->first_request)
1614 isert_rx_login_req(isert_conn);
1616 mutex_lock(&isert_conn->mutex);
1617 complete(&isert_conn->login_req_comp);
1618 mutex_unlock(&isert_conn->mutex);
1620 isert_rx_do_work(desc, isert_conn);
1623 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1629 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1630 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1631 enum iser_ib_op_code op, struct isert_data_buf *data)
1633 struct ib_device *ib_dev = isert_conn->cm_id->device;
1635 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1636 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1638 data->len = length - offset;
1639 data->offset = offset;
1640 data->sg_off = data->offset / PAGE_SIZE;
1642 data->sg = &sg[data->sg_off];
1643 data->nents = min_t(unsigned int, nents - data->sg_off,
1644 ISCSI_ISER_SG_TABLESIZE);
1645 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1648 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1650 if (unlikely(!data->dma_nents)) {
1651 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1655 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1656 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1662 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1664 struct ib_device *ib_dev = isert_conn->cm_id->device;
1666 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1667 memset(data, 0, sizeof(*data));
1673 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1675 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1677 isert_dbg("Cmd %p\n", isert_cmd);
1680 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1681 isert_unmap_data_buf(isert_conn, &wr->data);
1685 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1691 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1698 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1700 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1702 isert_dbg("Cmd %p\n", isert_cmd);
1705 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1706 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1707 isert_unmap_data_buf(isert_conn, &wr->prot);
1708 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1710 spin_lock_bh(&isert_conn->pool_lock);
1711 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1712 spin_unlock_bh(&isert_conn->pool_lock);
1717 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1718 isert_unmap_data_buf(isert_conn, &wr->data);
1726 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1728 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1729 struct isert_conn *isert_conn = isert_cmd->conn;
1730 struct iscsi_conn *conn = isert_conn->conn;
1731 struct isert_device *device = isert_conn->device;
1732 struct iscsi_text_rsp *hdr;
1734 isert_dbg("Cmd %p\n", isert_cmd);
1736 switch (cmd->iscsi_opcode) {
1737 case ISCSI_OP_SCSI_CMD:
1738 spin_lock_bh(&conn->cmd_lock);
1739 if (!list_empty(&cmd->i_conn_node))
1740 list_del_init(&cmd->i_conn_node);
1741 spin_unlock_bh(&conn->cmd_lock);
1743 if (cmd->data_direction == DMA_TO_DEVICE) {
1744 iscsit_stop_dataout_timer(cmd);
1746 * Check for special case during comp_err where
1747 * WRITE_PENDING has been handed off from core,
1748 * but requires an extra target_put_sess_cmd()
1749 * before transport_generic_free_cmd() below.
1752 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1753 struct se_cmd *se_cmd = &cmd->se_cmd;
1755 target_put_sess_cmd(se_cmd);
1759 device->unreg_rdma_mem(isert_cmd, isert_conn);
1760 transport_generic_free_cmd(&cmd->se_cmd, 0);
1762 case ISCSI_OP_SCSI_TMFUNC:
1763 spin_lock_bh(&conn->cmd_lock);
1764 if (!list_empty(&cmd->i_conn_node))
1765 list_del_init(&cmd->i_conn_node);
1766 spin_unlock_bh(&conn->cmd_lock);
1768 transport_generic_free_cmd(&cmd->se_cmd, 0);
1770 case ISCSI_OP_REJECT:
1771 case ISCSI_OP_NOOP_OUT:
1773 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1774 /* If the continue bit is on, keep the command alive */
1775 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1778 spin_lock_bh(&conn->cmd_lock);
1779 if (!list_empty(&cmd->i_conn_node))
1780 list_del_init(&cmd->i_conn_node);
1781 spin_unlock_bh(&conn->cmd_lock);
1784 * Handle special case for REJECT when iscsi_add_reject*() has
1785 * overwritten the original iscsi_opcode assignment, and the
1786 * associated cmd->se_cmd needs to be released.
1788 if (cmd->se_cmd.se_tfo != NULL) {
1789 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1791 transport_generic_free_cmd(&cmd->se_cmd, 0);
1798 iscsit_release_cmd(cmd);
1804 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1806 if (tx_desc->dma_addr != 0) {
1807 isert_dbg("unmap single for tx_desc->dma_addr\n");
1808 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1809 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1810 tx_desc->dma_addr = 0;
1815 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1816 struct ib_device *ib_dev, bool comp_err)
1818 if (isert_cmd->pdu_buf_dma != 0) {
1819 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1820 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1821 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1822 isert_cmd->pdu_buf_dma = 0;
1825 isert_unmap_tx_desc(tx_desc, ib_dev);
1826 isert_put_cmd(isert_cmd, comp_err);
1830 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1832 struct ib_mr_status mr_status;
1835 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1837 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1838 goto fail_mr_status;
1841 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1843 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1845 switch (mr_status.sig_err.err_type) {
1846 case IB_SIG_BAD_GUARD:
1847 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1849 case IB_SIG_BAD_REFTAG:
1850 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1852 case IB_SIG_BAD_APPTAG:
1853 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1856 sec_offset_err = mr_status.sig_err.sig_err_offset;
1857 do_div(sec_offset_err, block_size);
1858 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1860 isert_err("PI error found type %d at sector 0x%llx "
1861 "expected 0x%x vs actual 0x%x\n",
1862 mr_status.sig_err.err_type,
1863 (unsigned long long)se_cmd->bad_sector,
1864 mr_status.sig_err.expected,
1865 mr_status.sig_err.actual);
1874 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1875 struct isert_cmd *isert_cmd)
1877 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1878 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1879 struct se_cmd *se_cmd = &cmd->se_cmd;
1880 struct isert_conn *isert_conn = isert_cmd->conn;
1881 struct isert_device *device = isert_conn->device;
1884 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1885 ret = isert_check_pi_status(se_cmd,
1886 wr->fr_desc->pi_ctx->sig_mr);
1887 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1890 device->unreg_rdma_mem(isert_cmd, isert_conn);
1891 wr->rdma_wr_num = 0;
1893 transport_send_check_condition_and_sense(se_cmd,
1896 isert_put_response(isert_conn->conn, cmd);
1900 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1901 struct isert_cmd *isert_cmd)
1903 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1904 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1905 struct se_cmd *se_cmd = &cmd->se_cmd;
1906 struct isert_conn *isert_conn = isert_cmd->conn;
1907 struct isert_device *device = isert_conn->device;
1910 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1911 ret = isert_check_pi_status(se_cmd,
1912 wr->fr_desc->pi_ctx->sig_mr);
1913 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1916 iscsit_stop_dataout_timer(cmd);
1917 device->unreg_rdma_mem(isert_cmd, isert_conn);
1918 cmd->write_data_done = wr->data.len;
1919 wr->rdma_wr_num = 0;
1921 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1922 spin_lock_bh(&cmd->istate_lock);
1923 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1924 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1925 spin_unlock_bh(&cmd->istate_lock);
1928 target_put_sess_cmd(se_cmd);
1929 transport_send_check_condition_and_sense(se_cmd,
1932 target_execute_cmd(se_cmd);
1937 isert_do_control_comp(struct work_struct *work)
1939 struct isert_cmd *isert_cmd = container_of(work,
1940 struct isert_cmd, comp_work);
1941 struct isert_conn *isert_conn = isert_cmd->conn;
1942 struct ib_device *ib_dev = isert_conn->cm_id->device;
1943 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1945 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1947 switch (cmd->i_state) {
1948 case ISTATE_SEND_TASKMGTRSP:
1949 iscsit_tmr_post_handler(cmd, cmd->conn);
1950 case ISTATE_SEND_REJECT: /* FALLTHRU */
1951 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1952 cmd->i_state = ISTATE_SENT_STATUS;
1953 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1956 case ISTATE_SEND_LOGOUTRSP:
1957 iscsit_logout_post_handler(cmd, cmd->conn);
1960 isert_err("Unknown i_state %d\n", cmd->i_state);
1967 isert_response_completion(struct iser_tx_desc *tx_desc,
1968 struct isert_cmd *isert_cmd,
1969 struct isert_conn *isert_conn,
1970 struct ib_device *ib_dev)
1972 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1974 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1975 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1976 cmd->i_state == ISTATE_SEND_REJECT ||
1977 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1978 isert_unmap_tx_desc(tx_desc, ib_dev);
1980 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1981 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1985 cmd->i_state = ISTATE_SENT_STATUS;
1986 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1990 isert_snd_completion(struct iser_tx_desc *tx_desc,
1991 struct isert_conn *isert_conn)
1993 struct ib_device *ib_dev = isert_conn->cm_id->device;
1994 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1995 struct isert_rdma_wr *wr;
1998 isert_unmap_tx_desc(tx_desc, ib_dev);
2001 wr = &isert_cmd->rdma_wr;
2003 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2005 switch (wr->iser_ib_op) {
2007 isert_response_completion(tx_desc, isert_cmd,
2008 isert_conn, ib_dev);
2010 case ISER_IB_RDMA_WRITE:
2011 isert_completion_rdma_write(tx_desc, isert_cmd);
2013 case ISER_IB_RDMA_READ:
2014 isert_completion_rdma_read(tx_desc, isert_cmd);
2017 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2024 * is_isert_tx_desc() - Indicate if the completion wr_id
2025 * is a TX descriptor or not.
2026 * @isert_conn: iser connection
2027 * @wr_id: completion WR identifier
2029 * Since we cannot rely on wc opcode in FLUSH errors
2030 * we must work around it by checking if the wr_id address
2031 * falls in the iser connection rx_descs buffer. If so
2032 * it is an RX descriptor, otherwize it is a TX.
2035 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2037 void *start = isert_conn->rx_descs;
2038 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2040 if ((wr_id >= start && wr_id < start + len) ||
2041 (wr_id == isert_conn->login_req_buf))
2048 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2050 if (wc->wr_id == ISER_BEACON_WRID) {
2051 isert_info("conn %p completing wait_comp_err\n",
2053 complete(&isert_conn->wait_comp_err);
2054 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2055 struct ib_device *ib_dev = isert_conn->cm_id->device;
2056 struct isert_cmd *isert_cmd;
2057 struct iser_tx_desc *desc;
2059 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2060 isert_cmd = desc->isert_cmd;
2062 isert_unmap_tx_desc(desc, ib_dev);
2064 isert_completion_put(desc, isert_cmd, ib_dev, true);
2069 isert_handle_wc(struct ib_wc *wc)
2071 struct isert_conn *isert_conn;
2072 struct iser_tx_desc *tx_desc;
2073 struct iser_rx_desc *rx_desc;
2075 isert_conn = wc->qp->qp_context;
2076 if (likely(wc->status == IB_WC_SUCCESS)) {
2077 if (wc->opcode == IB_WC_RECV) {
2078 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2079 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2081 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2082 isert_snd_completion(tx_desc, isert_conn);
2085 if (wc->status != IB_WC_WR_FLUSH_ERR)
2086 isert_err("%s (%d): wr id %llx vend_err %x\n",
2087 ib_wc_status_msg(wc->status), wc->status,
2088 wc->wr_id, wc->vendor_err);
2090 isert_dbg("%s (%d): wr id %llx\n",
2091 ib_wc_status_msg(wc->status), wc->status,
2094 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2095 isert_cq_comp_err(isert_conn, wc);
2100 isert_cq_work(struct work_struct *work)
2102 enum { isert_poll_budget = 65536 };
2103 struct isert_comp *comp = container_of(work, struct isert_comp,
2105 struct ib_wc *const wcs = comp->wcs;
2106 int i, n, completed = 0;
2108 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2109 for (i = 0; i < n; i++)
2110 isert_handle_wc(&wcs[i]);
2113 if (completed >= isert_poll_budget)
2117 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2121 isert_cq_callback(struct ib_cq *cq, void *context)
2123 struct isert_comp *comp = context;
2125 queue_work(isert_comp_wq, &comp->work);
2129 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2131 struct ib_send_wr *wr_failed;
2134 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2136 isert_err("ib_post_recv failed with %d\n", ret);
2140 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2143 isert_err("ib_post_send failed with %d\n", ret);
2150 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2152 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2153 struct isert_conn *isert_conn = conn->context;
2154 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2155 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2156 &isert_cmd->tx_desc.iscsi_header;
2158 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2159 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2160 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2162 * Attach SENSE DATA payload to iSCSI Response PDU
2164 if (cmd->se_cmd.sense_buffer &&
2165 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2166 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2167 struct isert_device *device = isert_conn->device;
2168 struct ib_device *ib_dev = device->ib_device;
2169 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2170 u32 padding, pdu_len;
2172 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2174 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2176 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2177 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2178 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2180 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2181 (void *)cmd->sense_buffer, pdu_len,
2184 isert_cmd->pdu_buf_len = pdu_len;
2185 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2186 tx_dsg->length = pdu_len;
2187 tx_dsg->lkey = device->pd->local_dma_lkey;
2188 isert_cmd->tx_desc.num_sge = 2;
2191 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2193 isert_dbg("Posting SCSI Response\n");
2195 return isert_post_response(isert_conn, isert_cmd);
2199 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2201 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2202 struct isert_conn *isert_conn = conn->context;
2203 struct isert_device *device = isert_conn->device;
2205 spin_lock_bh(&conn->cmd_lock);
2206 if (!list_empty(&cmd->i_conn_node))
2207 list_del_init(&cmd->i_conn_node);
2208 spin_unlock_bh(&conn->cmd_lock);
2210 if (cmd->data_direction == DMA_TO_DEVICE)
2211 iscsit_stop_dataout_timer(cmd);
2213 device->unreg_rdma_mem(isert_cmd, isert_conn);
2216 static enum target_prot_op
2217 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2219 struct isert_conn *isert_conn = conn->context;
2220 struct isert_device *device = isert_conn->device;
2222 if (conn->tpg->tpg_attrib.t10_pi) {
2223 if (device->pi_capable) {
2224 isert_info("conn %p PI offload enabled\n", isert_conn);
2225 isert_conn->pi_support = true;
2226 return TARGET_PROT_ALL;
2230 isert_info("conn %p PI offload disabled\n", isert_conn);
2231 isert_conn->pi_support = false;
2233 return TARGET_PROT_NORMAL;
2237 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2238 bool nopout_response)
2240 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2241 struct isert_conn *isert_conn = conn->context;
2242 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2244 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2245 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2246 &isert_cmd->tx_desc.iscsi_header,
2248 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2249 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2251 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2253 return isert_post_response(isert_conn, isert_cmd);
2257 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2259 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2260 struct isert_conn *isert_conn = conn->context;
2261 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2263 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2264 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2265 &isert_cmd->tx_desc.iscsi_header);
2266 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2267 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2269 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2271 return isert_post_response(isert_conn, isert_cmd);
2275 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2277 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2278 struct isert_conn *isert_conn = conn->context;
2279 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2281 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2282 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2283 &isert_cmd->tx_desc.iscsi_header);
2284 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2285 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2287 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2289 return isert_post_response(isert_conn, isert_cmd);
2293 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2295 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2296 struct isert_conn *isert_conn = conn->context;
2297 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2298 struct isert_device *device = isert_conn->device;
2299 struct ib_device *ib_dev = device->ib_device;
2300 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2301 struct iscsi_reject *hdr =
2302 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2304 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2305 iscsit_build_reject(cmd, conn, hdr);
2306 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2308 hton24(hdr->dlength, ISCSI_HDR_LEN);
2309 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2310 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2312 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2313 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2314 tx_dsg->length = ISCSI_HDR_LEN;
2315 tx_dsg->lkey = device->pd->local_dma_lkey;
2316 isert_cmd->tx_desc.num_sge = 2;
2318 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2320 isert_dbg("conn %p Posting Reject\n", isert_conn);
2322 return isert_post_response(isert_conn, isert_cmd);
2326 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2328 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2329 struct isert_conn *isert_conn = conn->context;
2330 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2331 struct iscsi_text_rsp *hdr =
2332 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2336 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2337 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2342 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2345 struct isert_device *device = isert_conn->device;
2346 struct ib_device *ib_dev = device->ib_device;
2347 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2348 void *txt_rsp_buf = cmd->buf_ptr;
2350 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2351 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2353 isert_cmd->pdu_buf_len = txt_rsp_len;
2354 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2355 tx_dsg->length = txt_rsp_len;
2356 tx_dsg->lkey = device->pd->local_dma_lkey;
2357 isert_cmd->tx_desc.num_sge = 2;
2359 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2361 isert_dbg("conn %p Text Response\n", isert_conn);
2363 return isert_post_response(isert_conn, isert_cmd);
2367 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2368 struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr,
2369 u32 data_left, u32 offset)
2371 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2372 struct scatterlist *sg_start, *tmp_sg;
2373 struct isert_device *device = isert_conn->device;
2374 struct ib_device *ib_dev = device->ib_device;
2375 u32 sg_off, page_off;
2376 int i = 0, sg_nents;
2378 sg_off = offset / PAGE_SIZE;
2379 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2380 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2381 page_off = offset % PAGE_SIZE;
2383 rdma_wr->wr.sg_list = ib_sge;
2384 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2386 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2388 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2389 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2391 (unsigned long long)tmp_sg->dma_address,
2392 tmp_sg->length, page_off);
2394 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2395 ib_sge->length = min_t(u32, data_left,
2396 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2397 ib_sge->lkey = device->pd->local_dma_lkey;
2399 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2400 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2402 data_left -= ib_sge->length;
2406 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2409 rdma_wr->wr.num_sge = ++i;
2410 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2411 rdma_wr->wr.sg_list, rdma_wr->wr.num_sge);
2413 return rdma_wr->wr.num_sge;
2417 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2418 struct isert_rdma_wr *wr)
2420 struct se_cmd *se_cmd = &cmd->se_cmd;
2421 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2422 struct isert_conn *isert_conn = conn->context;
2423 struct isert_data_buf *data = &wr->data;
2424 struct ib_rdma_wr *rdma_wr;
2425 struct ib_sge *ib_sge;
2426 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2427 int ret = 0, i, ib_sge_cnt;
2429 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2431 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2432 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2433 se_cmd->t_data_nents, se_cmd->data_length,
2434 offset, wr->iser_ib_op, &wr->data);
2438 data_left = data->len;
2439 offset = data->offset;
2441 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2443 isert_warn("Unable to allocate ib_sge\n");
2447 wr->ib_sge = ib_sge;
2449 wr->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2450 wr->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) * wr->rdma_wr_num,
2453 isert_dbg("Unable to allocate wr->rdma_wr\n");
2458 wr->isert_cmd = isert_cmd;
2459 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2461 for (i = 0; i < wr->rdma_wr_num; i++) {
2462 rdma_wr = &isert_cmd->rdma_wr.rdma_wr[i];
2463 data_len = min(data_left, rdma_write_max);
2465 rdma_wr->wr.send_flags = 0;
2466 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2467 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2468 rdma_wr->remote_addr = isert_cmd->read_va + offset;
2469 rdma_wr->rkey = isert_cmd->read_stag;
2470 if (i + 1 == wr->rdma_wr_num)
2471 rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr;
2473 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2475 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2476 rdma_wr->remote_addr = isert_cmd->write_va + va_offset;
2477 rdma_wr->rkey = isert_cmd->write_stag;
2478 if (i + 1 == wr->rdma_wr_num)
2479 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2481 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2484 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2485 rdma_wr, data_len, offset);
2486 ib_sge += ib_sge_cnt;
2489 va_offset += data_len;
2490 data_left -= data_len;
2495 isert_unmap_data_buf(isert_conn, data);
2501 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2505 memset(inv_wr, 0, sizeof(*inv_wr));
2506 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2507 inv_wr->opcode = IB_WR_LOCAL_INV;
2508 inv_wr->ex.invalidate_rkey = mr->rkey;
2511 rkey = ib_inc_rkey(mr->rkey);
2512 ib_update_fast_reg_key(mr, rkey);
2516 isert_fast_reg_mr(struct isert_conn *isert_conn,
2517 struct fast_reg_descriptor *fr_desc,
2518 struct isert_data_buf *mem,
2519 enum isert_indicator ind,
2522 struct isert_device *device = isert_conn->device;
2523 struct ib_device *ib_dev = device->ib_device;
2525 struct ib_reg_wr reg_wr;
2526 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2529 if (mem->dma_nents == 1) {
2530 sge->lkey = device->pd->local_dma_lkey;
2531 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2532 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2533 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2534 sge->addr, sge->length, sge->lkey);
2538 if (ind == ISERT_DATA_KEY_VALID)
2539 /* Registering data buffer */
2540 mr = fr_desc->data_mr;
2542 /* Registering protection buffer */
2543 mr = fr_desc->pi_ctx->prot_mr;
2545 if (!(fr_desc->ind & ind)) {
2546 isert_inv_rkey(&inv_wr, mr);
2550 n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE);
2551 if (unlikely(n != mem->nents)) {
2552 isert_err("failed to map mr sg (%d/%d)\n",
2554 return n < 0 ? n : -EINVAL;
2557 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2558 fr_desc, mem->nents, mem->offset);
2560 reg_wr.wr.next = NULL;
2561 reg_wr.wr.opcode = IB_WR_REG_MR;
2562 reg_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2563 reg_wr.wr.send_flags = 0;
2564 reg_wr.wr.num_sge = 0;
2566 reg_wr.key = mr->lkey;
2567 reg_wr.access = IB_ACCESS_LOCAL_WRITE;
2572 wr->next = ®_wr.wr;
2574 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2576 isert_err("fast registration failed, ret:%d\n", ret);
2579 fr_desc->ind &= ~ind;
2581 sge->lkey = mr->lkey;
2582 sge->addr = mr->iova;
2583 sge->length = mr->length;
2585 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2586 sge->addr, sge->length, sge->lkey);
2592 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2593 struct ib_sig_domain *domain)
2595 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2596 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2597 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2598 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2600 * At the moment we hard code those, but if in the future
2601 * the target core would like to use it, we will take it
2604 domain->sig.dif.apptag_check_mask = 0xffff;
2605 domain->sig.dif.app_escape = true;
2606 domain->sig.dif.ref_escape = true;
2607 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2608 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2609 domain->sig.dif.ref_remap = true;
2613 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2615 switch (se_cmd->prot_op) {
2616 case TARGET_PROT_DIN_INSERT:
2617 case TARGET_PROT_DOUT_STRIP:
2618 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2619 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2621 case TARGET_PROT_DOUT_INSERT:
2622 case TARGET_PROT_DIN_STRIP:
2623 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2624 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2626 case TARGET_PROT_DIN_PASS:
2627 case TARGET_PROT_DOUT_PASS:
2628 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2629 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2632 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2640 isert_set_prot_checks(u8 prot_checks)
2642 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2643 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2644 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2648 isert_reg_sig_mr(struct isert_conn *isert_conn,
2649 struct se_cmd *se_cmd,
2650 struct isert_rdma_wr *rdma_wr,
2651 struct fast_reg_descriptor *fr_desc)
2653 struct ib_sig_handover_wr sig_wr;
2654 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2655 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2656 struct ib_sig_attrs sig_attrs;
2659 memset(&sig_attrs, 0, sizeof(sig_attrs));
2660 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2664 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2666 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2667 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2671 memset(&sig_wr, 0, sizeof(sig_wr));
2672 sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
2673 sig_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2674 sig_wr.wr.sg_list = &rdma_wr->ib_sg[DATA];
2675 sig_wr.wr.num_sge = 1;
2676 sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
2677 sig_wr.sig_attrs = &sig_attrs;
2678 sig_wr.sig_mr = pi_ctx->sig_mr;
2679 if (se_cmd->t_prot_sg)
2680 sig_wr.prot = &rdma_wr->ib_sg[PROT];
2685 wr->next = &sig_wr.wr;
2687 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2689 isert_err("fast registration failed, ret:%d\n", ret);
2692 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2694 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2695 rdma_wr->ib_sg[SIG].addr = 0;
2696 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2697 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2698 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2700 * We have protection guards on the wire
2701 * so we need to set a larget transfer
2703 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2705 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2706 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2707 rdma_wr->ib_sg[SIG].lkey);
2713 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2714 struct isert_cmd *isert_cmd,
2715 struct isert_rdma_wr *wr)
2717 struct isert_device *device = isert_conn->device;
2718 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2721 if (!wr->fr_desc->pi_ctx) {
2722 ret = isert_create_pi_ctx(wr->fr_desc,
2726 isert_err("conn %p failed to allocate pi_ctx\n",
2732 if (se_cmd->t_prot_sg) {
2733 ret = isert_map_data_buf(isert_conn, isert_cmd,
2735 se_cmd->t_prot_nents,
2736 se_cmd->prot_length,
2737 0, wr->iser_ib_op, &wr->prot);
2739 isert_err("conn %p failed to map protection buffer\n",
2744 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2745 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2746 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2748 isert_err("conn %p failed to fast reg mr\n",
2750 goto unmap_prot_cmd;
2754 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2756 isert_err("conn %p failed to fast reg mr\n",
2758 goto unmap_prot_cmd;
2760 wr->fr_desc->ind |= ISERT_PROTECTED;
2765 if (se_cmd->t_prot_sg)
2766 isert_unmap_data_buf(isert_conn, &wr->prot);
2772 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2773 struct isert_rdma_wr *wr)
2775 struct se_cmd *se_cmd = &cmd->se_cmd;
2776 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2777 struct isert_conn *isert_conn = conn->context;
2778 struct fast_reg_descriptor *fr_desc = NULL;
2779 struct ib_rdma_wr *rdma_wr;
2780 struct ib_sge *ib_sg;
2783 unsigned long flags;
2785 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2787 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2788 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2789 se_cmd->t_data_nents, se_cmd->data_length,
2790 offset, wr->iser_ib_op, &wr->data);
2794 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2795 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2796 fr_desc = list_first_entry(&isert_conn->fr_pool,
2797 struct fast_reg_descriptor, list);
2798 list_del(&fr_desc->list);
2799 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2800 wr->fr_desc = fr_desc;
2803 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2804 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2808 if (isert_prot_cmd(isert_conn, se_cmd)) {
2809 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2813 ib_sg = &wr->ib_sg[SIG];
2815 ib_sg = &wr->ib_sg[DATA];
2818 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2819 wr->ib_sge = &wr->s_ib_sge;
2820 wr->rdma_wr_num = 1;
2821 memset(&wr->s_rdma_wr, 0, sizeof(wr->s_rdma_wr));
2822 wr->rdma_wr = &wr->s_rdma_wr;
2823 wr->isert_cmd = isert_cmd;
2825 rdma_wr = &isert_cmd->rdma_wr.s_rdma_wr;
2826 rdma_wr->wr.sg_list = &wr->s_ib_sge;
2827 rdma_wr->wr.num_sge = 1;
2828 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2829 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2830 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2831 rdma_wr->remote_addr = isert_cmd->read_va;
2832 rdma_wr->rkey = isert_cmd->read_stag;
2833 rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2834 0 : IB_SEND_SIGNALED;
2836 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2837 rdma_wr->remote_addr = isert_cmd->write_va;
2838 rdma_wr->rkey = isert_cmd->write_stag;
2839 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2846 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2847 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2848 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2850 isert_unmap_data_buf(isert_conn, &wr->data);
2856 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2858 struct se_cmd *se_cmd = &cmd->se_cmd;
2859 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2860 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2861 struct isert_conn *isert_conn = conn->context;
2862 struct isert_device *device = isert_conn->device;
2863 struct ib_send_wr *wr_failed;
2866 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2867 isert_cmd, se_cmd->data_length);
2869 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2870 rc = device->reg_rdma_mem(conn, cmd, wr);
2872 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2876 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2878 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2880 isert_create_send_desc(isert_conn, isert_cmd,
2881 &isert_cmd->tx_desc);
2882 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2883 &isert_cmd->tx_desc.iscsi_header);
2884 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2885 isert_init_send_wr(isert_conn, isert_cmd,
2886 &isert_cmd->tx_desc.send_wr);
2887 isert_cmd->rdma_wr.s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr;
2888 wr->rdma_wr_num += 1;
2890 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2892 isert_err("ib_post_recv failed with %d\n", rc);
2897 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2899 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2901 if (!isert_prot_cmd(isert_conn, se_cmd))
2902 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2903 "READ\n", isert_cmd);
2905 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2912 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2914 struct se_cmd *se_cmd = &cmd->se_cmd;
2915 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2916 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2917 struct isert_conn *isert_conn = conn->context;
2918 struct isert_device *device = isert_conn->device;
2919 struct ib_send_wr *wr_failed;
2922 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2923 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2924 wr->iser_ib_op = ISER_IB_RDMA_READ;
2925 rc = device->reg_rdma_mem(conn, cmd, wr);
2927 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2931 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2933 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2935 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2942 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2944 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2949 spin_lock_bh(&conn->cmd_lock);
2950 list_del_init(&cmd->i_conn_node);
2951 spin_unlock_bh(&conn->cmd_lock);
2952 isert_put_cmd(isert_cmd, true);
2954 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2955 ret = isert_put_nopin(cmd, conn, false);
2958 isert_err("Unknown immediate state: 0x%02x\n", state);
2967 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2969 struct isert_conn *isert_conn = conn->context;
2973 case ISTATE_SEND_LOGOUTRSP:
2974 ret = isert_put_logout_rsp(cmd, conn);
2976 isert_conn->logout_posted = true;
2978 case ISTATE_SEND_NOPIN:
2979 ret = isert_put_nopin(cmd, conn, true);
2981 case ISTATE_SEND_TASKMGTRSP:
2982 ret = isert_put_tm_rsp(cmd, conn);
2984 case ISTATE_SEND_REJECT:
2985 ret = isert_put_reject(cmd, conn);
2987 case ISTATE_SEND_TEXTRSP:
2988 ret = isert_put_text_rsp(cmd, conn);
2990 case ISTATE_SEND_STATUS:
2992 * Special case for sending non GOOD SCSI status from TX thread
2993 * context during pre se_cmd excecution failure.
2995 ret = isert_put_response(conn, cmd);
2998 isert_err("Unknown response state: 0x%02x\n", state);
3007 isert_setup_id(struct isert_np *isert_np)
3009 struct iscsi_np *np = isert_np->np;
3010 struct rdma_cm_id *id;
3011 struct sockaddr *sa;
3014 sa = (struct sockaddr *)&np->np_sockaddr;
3015 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3017 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
3018 RDMA_PS_TCP, IB_QPT_RC);
3020 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3024 isert_dbg("id %p context %p\n", id, id->context);
3026 ret = rdma_bind_addr(id, sa);
3028 isert_err("rdma_bind_addr() failed: %d\n", ret);
3032 ret = rdma_listen(id, 0);
3034 isert_err("rdma_listen() failed: %d\n", ret);
3040 rdma_destroy_id(id);
3042 return ERR_PTR(ret);
3046 isert_setup_np(struct iscsi_np *np,
3047 struct sockaddr_storage *ksockaddr)
3049 struct isert_np *isert_np;
3050 struct rdma_cm_id *isert_lid;
3053 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3055 isert_err("Unable to allocate struct isert_np\n");
3058 sema_init(&isert_np->sem, 0);
3059 mutex_init(&isert_np->mutex);
3060 INIT_LIST_HEAD(&isert_np->accepted);
3061 INIT_LIST_HEAD(&isert_np->pending);
3065 * Setup the np->np_sockaddr from the passed sockaddr setup
3066 * in iscsi_target_configfs.c code..
3068 memcpy(&np->np_sockaddr, ksockaddr,
3069 sizeof(struct sockaddr_storage));
3071 isert_lid = isert_setup_id(isert_np);
3072 if (IS_ERR(isert_lid)) {
3073 ret = PTR_ERR(isert_lid);
3077 isert_np->cm_id = isert_lid;
3078 np->np_context = isert_np;
3089 isert_rdma_accept(struct isert_conn *isert_conn)
3091 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3092 struct rdma_conn_param cp;
3095 memset(&cp, 0, sizeof(struct rdma_conn_param));
3096 cp.initiator_depth = isert_conn->initiator_depth;
3098 cp.rnr_retry_count = 7;
3100 ret = rdma_accept(cm_id, &cp);
3102 isert_err("rdma_accept() failed with: %d\n", ret);
3110 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3112 struct isert_conn *isert_conn = conn->context;
3115 isert_info("before login_req comp conn: %p\n", isert_conn);
3116 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3118 isert_err("isert_conn %p interrupted before got login req\n",
3122 reinit_completion(&isert_conn->login_req_comp);
3125 * For login requests after the first PDU, isert_rx_login_req() will
3126 * kick schedule_delayed_work(&conn->login_work) as the packet is
3127 * received, which turns this callback from iscsi_target_do_login_rx()
3130 if (!login->first_request)
3133 isert_rx_login_req(isert_conn);
3135 isert_info("before login_comp conn: %p\n", conn);
3136 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3140 isert_info("processing login->req: %p\n", login->req);
3146 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3147 struct isert_conn *isert_conn)
3149 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3150 struct rdma_route *cm_route = &cm_id->route;
3152 conn->login_family = np->np_sockaddr.ss_family;
3154 conn->login_sockaddr = cm_route->addr.dst_addr;
3155 conn->local_sockaddr = cm_route->addr.src_addr;
3159 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3161 struct isert_np *isert_np = np->np_context;
3162 struct isert_conn *isert_conn;
3166 ret = down_interruptible(&isert_np->sem);
3170 spin_lock_bh(&np->np_thread_lock);
3171 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3172 spin_unlock_bh(&np->np_thread_lock);
3173 isert_dbg("np_thread_state %d\n",
3174 np->np_thread_state);
3176 * No point in stalling here when np_thread
3177 * is in state RESET/SHUTDOWN/EXIT - bail
3181 spin_unlock_bh(&np->np_thread_lock);
3183 mutex_lock(&isert_np->mutex);
3184 if (list_empty(&isert_np->pending)) {
3185 mutex_unlock(&isert_np->mutex);
3188 isert_conn = list_first_entry(&isert_np->pending,
3189 struct isert_conn, node);
3190 list_del_init(&isert_conn->node);
3191 mutex_unlock(&isert_np->mutex);
3193 conn->context = isert_conn;
3194 isert_conn->conn = conn;
3195 isert_conn->state = ISER_CONN_BOUND;
3197 isert_set_conn_info(np, conn, isert_conn);
3199 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3205 isert_free_np(struct iscsi_np *np)
3207 struct isert_np *isert_np = np->np_context;
3208 struct isert_conn *isert_conn, *n;
3210 if (isert_np->cm_id)
3211 rdma_destroy_id(isert_np->cm_id);
3214 * FIXME: At this point we don't have a good way to insure
3215 * that at this point we don't have hanging connections that
3216 * completed RDMA establishment but didn't start iscsi login
3217 * process. So work-around this by cleaning up what ever piled
3218 * up in accepted and pending lists.
3220 mutex_lock(&isert_np->mutex);
3221 if (!list_empty(&isert_np->pending)) {
3222 isert_info("Still have isert pending connections\n");
3223 list_for_each_entry_safe(isert_conn, n,
3226 isert_info("cleaning isert_conn %p state (%d)\n",
3227 isert_conn, isert_conn->state);
3228 isert_connect_release(isert_conn);
3232 if (!list_empty(&isert_np->accepted)) {
3233 isert_info("Still have isert accepted connections\n");
3234 list_for_each_entry_safe(isert_conn, n,
3235 &isert_np->accepted,
3237 isert_info("cleaning isert_conn %p state (%d)\n",
3238 isert_conn, isert_conn->state);
3239 isert_connect_release(isert_conn);
3242 mutex_unlock(&isert_np->mutex);
3244 np->np_context = NULL;
3248 static void isert_release_work(struct work_struct *work)
3250 struct isert_conn *isert_conn = container_of(work,
3254 isert_info("Starting release conn %p\n", isert_conn);
3256 wait_for_completion(&isert_conn->wait);
3258 mutex_lock(&isert_conn->mutex);
3259 isert_conn->state = ISER_CONN_DOWN;
3260 mutex_unlock(&isert_conn->mutex);
3262 isert_info("Destroying conn %p\n", isert_conn);
3263 isert_put_conn(isert_conn);
3267 isert_wait4logout(struct isert_conn *isert_conn)
3269 struct iscsi_conn *conn = isert_conn->conn;
3271 isert_info("conn %p\n", isert_conn);
3273 if (isert_conn->logout_posted) {
3274 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3275 wait_for_completion_timeout(&conn->conn_logout_comp,
3276 SECONDS_FOR_LOGOUT_COMP * HZ);
3281 isert_wait4cmds(struct iscsi_conn *conn)
3283 isert_info("iscsi_conn %p\n", conn);
3286 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3287 target_wait_for_sess_cmds(conn->sess->se_sess);
3292 isert_wait4flush(struct isert_conn *isert_conn)
3294 struct ib_recv_wr *bad_wr;
3296 isert_info("conn %p\n", isert_conn);
3298 init_completion(&isert_conn->wait_comp_err);
3299 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3300 /* post an indication that all flush errors were consumed */
3301 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3302 isert_err("conn %p failed to post beacon", isert_conn);
3306 wait_for_completion(&isert_conn->wait_comp_err);
3310 * isert_put_unsol_pending_cmds() - Drop commands waiting for
3311 * unsolicitate dataout
3312 * @conn: iscsi connection
3314 * We might still have commands that are waiting for unsolicited
3315 * dataouts messages. We must put the extra reference on those
3316 * before blocking on the target_wait_for_session_cmds
3319 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3321 struct iscsi_cmd *cmd, *tmp;
3322 static LIST_HEAD(drop_cmd_list);
3324 spin_lock_bh(&conn->cmd_lock);
3325 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3326 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3327 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3328 (cmd->write_data_done < cmd->se_cmd.data_length))
3329 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3331 spin_unlock_bh(&conn->cmd_lock);
3333 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3334 list_del_init(&cmd->i_conn_node);
3335 if (cmd->i_state != ISTATE_REMOVE) {
3336 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3338 isert_info("conn %p dropping cmd %p\n", conn, cmd);
3339 isert_put_cmd(isert_cmd, true);
3344 static void isert_wait_conn(struct iscsi_conn *conn)
3346 struct isert_conn *isert_conn = conn->context;
3348 isert_info("Starting conn %p\n", isert_conn);
3350 mutex_lock(&isert_conn->mutex);
3352 * Only wait for wait_comp_err if the isert_conn made it
3353 * into full feature phase..
3355 if (isert_conn->state == ISER_CONN_INIT) {
3356 mutex_unlock(&isert_conn->mutex);
3359 isert_conn_terminate(isert_conn);
3360 mutex_unlock(&isert_conn->mutex);
3362 isert_wait4flush(isert_conn);
3363 isert_put_unsol_pending_cmds(conn);
3364 isert_wait4cmds(conn);
3365 isert_wait4logout(isert_conn);
3367 queue_work(isert_release_wq, &isert_conn->release_work);
3370 static void isert_free_conn(struct iscsi_conn *conn)
3372 struct isert_conn *isert_conn = conn->context;
3374 isert_wait4flush(isert_conn);
3375 isert_put_conn(isert_conn);
3378 static struct iscsit_transport iser_target_transport = {
3380 .transport_type = ISCSI_INFINIBAND,
3381 .priv_size = sizeof(struct isert_cmd),
3382 .owner = THIS_MODULE,
3383 .iscsit_setup_np = isert_setup_np,
3384 .iscsit_accept_np = isert_accept_np,
3385 .iscsit_free_np = isert_free_np,
3386 .iscsit_wait_conn = isert_wait_conn,
3387 .iscsit_free_conn = isert_free_conn,
3388 .iscsit_get_login_rx = isert_get_login_rx,
3389 .iscsit_put_login_tx = isert_put_login_tx,
3390 .iscsit_immediate_queue = isert_immediate_queue,
3391 .iscsit_response_queue = isert_response_queue,
3392 .iscsit_get_dataout = isert_get_dataout,
3393 .iscsit_queue_data_in = isert_put_datain,
3394 .iscsit_queue_status = isert_put_response,
3395 .iscsit_aborted_task = isert_aborted_task,
3396 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3399 static int __init isert_init(void)
3403 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3404 WQ_UNBOUND | WQ_HIGHPRI, 0);
3405 if (!isert_comp_wq) {
3406 isert_err("Unable to allocate isert_comp_wq\n");
3411 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3412 WQ_UNBOUND_MAX_ACTIVE);
3413 if (!isert_release_wq) {
3414 isert_err("Unable to allocate isert_release_wq\n");
3416 goto destroy_comp_wq;
3419 iscsit_register_transport(&iser_target_transport);
3420 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3425 destroy_workqueue(isert_comp_wq);
3430 static void __exit isert_exit(void)
3432 flush_scheduled_work();
3433 destroy_workqueue(isert_release_wq);
3434 destroy_workqueue(isert_comp_wq);
3435 iscsit_unregister_transport(&iser_target_transport);
3436 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3439 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3440 MODULE_VERSION("1.0");
3441 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3442 MODULE_LICENSE("GPL");
3444 module_init(isert_init);
3445 module_exit(isert_exit);