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);
71 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
73 return (conn->pi_support &&
74 cmd->prot_op != TARGET_PROT_NORMAL);
79 isert_qp_event_callback(struct ib_event *e, void *context)
81 struct isert_conn *isert_conn = context;
83 isert_err("conn %p event: %d\n", isert_conn, e->event);
85 case IB_EVENT_COMM_EST:
86 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
88 case IB_EVENT_QP_LAST_WQE_REACHED:
89 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
97 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
101 ret = ib_query_device(ib_dev, devattr);
103 isert_err("ib_query_device() failed: %d\n", ret);
106 isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
107 isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
112 static struct isert_comp *
113 isert_comp_get(struct isert_conn *isert_conn)
115 struct isert_device *device = isert_conn->device;
116 struct isert_comp *comp;
119 mutex_lock(&device_list_mutex);
120 for (i = 0; i < device->comps_used; i++)
121 if (device->comps[i].active_qps <
122 device->comps[min].active_qps)
124 comp = &device->comps[min];
126 mutex_unlock(&device_list_mutex);
128 isert_info("conn %p, using comp %p min_index: %d\n",
129 isert_conn, comp, min);
135 isert_comp_put(struct isert_comp *comp)
137 mutex_lock(&device_list_mutex);
139 mutex_unlock(&device_list_mutex);
142 static struct ib_qp *
143 isert_create_qp(struct isert_conn *isert_conn,
144 struct isert_comp *comp,
145 struct rdma_cm_id *cma_id)
147 struct isert_device *device = isert_conn->device;
148 struct ib_qp_init_attr attr;
151 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
152 attr.event_handler = isert_qp_event_callback;
153 attr.qp_context = isert_conn;
154 attr.send_cq = comp->cq;
155 attr.recv_cq = comp->cq;
156 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
157 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
159 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
160 * work-around for RDMA_READs with ConnectX-2.
162 * Also, still make sure to have at least two SGEs for
163 * outgoing control PDU responses.
165 attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
166 isert_conn->max_sge = attr.cap.max_send_sge;
168 attr.cap.max_recv_sge = 1;
169 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
170 attr.qp_type = IB_QPT_RC;
171 if (device->pi_capable)
172 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
174 ret = rdma_create_qp(cma_id, device->pd, &attr);
176 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
184 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
186 struct isert_comp *comp;
189 comp = isert_comp_get(isert_conn);
190 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
191 if (IS_ERR(isert_conn->qp)) {
192 ret = PTR_ERR(isert_conn->qp);
198 isert_comp_put(comp);
203 isert_cq_event_callback(struct ib_event *e, void *context)
205 isert_dbg("event: %d\n", e->event);
209 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
211 struct isert_device *device = isert_conn->device;
212 struct ib_device *ib_dev = device->ib_device;
213 struct iser_rx_desc *rx_desc;
214 struct ib_sge *rx_sg;
218 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
219 sizeof(struct iser_rx_desc), GFP_KERNEL);
220 if (!isert_conn->rx_descs)
223 rx_desc = isert_conn->rx_descs;
225 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
226 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
227 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
228 if (ib_dma_mapping_error(ib_dev, dma_addr))
231 rx_desc->dma_addr = dma_addr;
233 rx_sg = &rx_desc->rx_sg;
234 rx_sg->addr = rx_desc->dma_addr;
235 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
236 rx_sg->lkey = device->mr->lkey;
239 isert_conn->rx_desc_head = 0;
244 rx_desc = isert_conn->rx_descs;
245 for (j = 0; j < i; j++, rx_desc++) {
246 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
247 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
249 kfree(isert_conn->rx_descs);
250 isert_conn->rx_descs = NULL;
252 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
258 isert_free_rx_descriptors(struct isert_conn *isert_conn)
260 struct ib_device *ib_dev = isert_conn->device->ib_device;
261 struct iser_rx_desc *rx_desc;
264 if (!isert_conn->rx_descs)
267 rx_desc = isert_conn->rx_descs;
268 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
269 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
270 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
273 kfree(isert_conn->rx_descs);
274 isert_conn->rx_descs = NULL;
277 static void isert_cq_work(struct work_struct *);
278 static void isert_cq_callback(struct ib_cq *, void *);
281 isert_free_comps(struct isert_device *device)
285 for (i = 0; i < device->comps_used; i++) {
286 struct isert_comp *comp = &device->comps[i];
289 cancel_work_sync(&comp->work);
290 ib_destroy_cq(comp->cq);
293 kfree(device->comps);
297 isert_alloc_comps(struct isert_device *device,
298 struct ib_device_attr *attr)
300 int i, max_cqe, ret = 0;
302 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
303 device->ib_device->num_comp_vectors));
305 isert_info("Using %d CQs, %s supports %d vectors support "
306 "Fast registration %d pi_capable %d\n",
307 device->comps_used, device->ib_device->name,
308 device->ib_device->num_comp_vectors, device->use_fastreg,
311 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
313 if (!device->comps) {
314 isert_err("Unable to allocate completion contexts\n");
318 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
320 for (i = 0; i < device->comps_used; i++) {
321 struct isert_comp *comp = &device->comps[i];
323 comp->device = device;
324 INIT_WORK(&comp->work, isert_cq_work);
325 comp->cq = ib_create_cq(device->ib_device,
327 isert_cq_event_callback,
330 if (IS_ERR(comp->cq)) {
331 isert_err("Unable to allocate cq\n");
332 ret = PTR_ERR(comp->cq);
337 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
344 isert_free_comps(device);
349 isert_create_device_ib_res(struct isert_device *device)
351 struct ib_device_attr *dev_attr;
354 dev_attr = &device->dev_attr;
355 ret = isert_query_device(device->ib_device, dev_attr);
359 /* asign function handlers */
360 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
361 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
362 device->use_fastreg = 1;
363 device->reg_rdma_mem = isert_reg_rdma;
364 device->unreg_rdma_mem = isert_unreg_rdma;
366 device->use_fastreg = 0;
367 device->reg_rdma_mem = isert_map_rdma;
368 device->unreg_rdma_mem = isert_unmap_cmd;
371 ret = isert_alloc_comps(device, dev_attr);
375 device->pd = ib_alloc_pd(device->ib_device);
376 if (IS_ERR(device->pd)) {
377 ret = PTR_ERR(device->pd);
378 isert_err("failed to allocate pd, device %p, ret=%d\n",
383 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE);
384 if (IS_ERR(device->mr)) {
385 ret = PTR_ERR(device->mr);
386 isert_err("failed to create dma mr, device %p, ret=%d\n",
391 /* Check signature cap */
392 device->pi_capable = dev_attr->device_cap_flags &
393 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
398 ib_dealloc_pd(device->pd);
400 isert_free_comps(device);
405 isert_free_device_ib_res(struct isert_device *device)
407 isert_info("device %p\n", device);
409 ib_dereg_mr(device->mr);
410 ib_dealloc_pd(device->pd);
411 isert_free_comps(device);
415 isert_device_put(struct isert_device *device)
417 mutex_lock(&device_list_mutex);
419 isert_info("device %p refcount %d\n", device, device->refcount);
420 if (!device->refcount) {
421 isert_free_device_ib_res(device);
422 list_del(&device->dev_node);
425 mutex_unlock(&device_list_mutex);
428 static struct isert_device *
429 isert_device_get(struct rdma_cm_id *cma_id)
431 struct isert_device *device;
434 mutex_lock(&device_list_mutex);
435 list_for_each_entry(device, &device_list, dev_node) {
436 if (device->ib_device->node_guid == cma_id->device->node_guid) {
438 isert_info("Found iser device %p refcount %d\n",
439 device, device->refcount);
440 mutex_unlock(&device_list_mutex);
445 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
447 mutex_unlock(&device_list_mutex);
448 return ERR_PTR(-ENOMEM);
451 INIT_LIST_HEAD(&device->dev_node);
453 device->ib_device = cma_id->device;
454 ret = isert_create_device_ib_res(device);
457 mutex_unlock(&device_list_mutex);
462 list_add_tail(&device->dev_node, &device_list);
463 isert_info("Created a new iser device %p refcount %d\n",
464 device, device->refcount);
465 mutex_unlock(&device_list_mutex);
471 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
473 struct fast_reg_descriptor *fr_desc, *tmp;
476 if (list_empty(&isert_conn->fr_pool))
479 isert_info("Freeing conn %p fastreg pool", isert_conn);
481 list_for_each_entry_safe(fr_desc, tmp,
482 &isert_conn->fr_pool, list) {
483 list_del(&fr_desc->list);
484 ib_free_fast_reg_page_list(fr_desc->data_frpl);
485 ib_dereg_mr(fr_desc->data_mr);
486 if (fr_desc->pi_ctx) {
487 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
488 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
489 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
490 kfree(fr_desc->pi_ctx);
496 if (i < isert_conn->fr_pool_size)
497 isert_warn("Pool still has %d regions registered\n",
498 isert_conn->fr_pool_size - i);
502 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
503 struct ib_device *device,
506 struct ib_mr_init_attr mr_init_attr;
507 struct pi_context *pi_ctx;
510 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
512 isert_err("Failed to allocate pi context\n");
516 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
517 ISCSI_ISER_SG_TABLESIZE);
518 if (IS_ERR(pi_ctx->prot_frpl)) {
519 isert_err("Failed to allocate prot frpl err=%ld\n",
520 PTR_ERR(pi_ctx->prot_frpl));
521 ret = PTR_ERR(pi_ctx->prot_frpl);
525 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
526 if (IS_ERR(pi_ctx->prot_mr)) {
527 isert_err("Failed to allocate prot frmr err=%ld\n",
528 PTR_ERR(pi_ctx->prot_mr));
529 ret = PTR_ERR(pi_ctx->prot_mr);
532 desc->ind |= ISERT_PROT_KEY_VALID;
534 memset(&mr_init_attr, 0, sizeof(mr_init_attr));
535 mr_init_attr.max_reg_descriptors = 2;
536 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
537 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
538 if (IS_ERR(pi_ctx->sig_mr)) {
539 isert_err("Failed to allocate signature enabled mr err=%ld\n",
540 PTR_ERR(pi_ctx->sig_mr));
541 ret = PTR_ERR(pi_ctx->sig_mr);
545 desc->pi_ctx = pi_ctx;
546 desc->ind |= ISERT_SIG_KEY_VALID;
547 desc->ind &= ~ISERT_PROTECTED;
552 ib_dereg_mr(pi_ctx->prot_mr);
554 ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
562 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
563 struct fast_reg_descriptor *fr_desc)
567 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
568 ISCSI_ISER_SG_TABLESIZE);
569 if (IS_ERR(fr_desc->data_frpl)) {
570 isert_err("Failed to allocate data frpl err=%ld\n",
571 PTR_ERR(fr_desc->data_frpl));
572 return PTR_ERR(fr_desc->data_frpl);
575 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
576 if (IS_ERR(fr_desc->data_mr)) {
577 isert_err("Failed to allocate data frmr err=%ld\n",
578 PTR_ERR(fr_desc->data_mr));
579 ret = PTR_ERR(fr_desc->data_mr);
582 fr_desc->ind |= ISERT_DATA_KEY_VALID;
584 isert_dbg("Created fr_desc %p\n", fr_desc);
589 ib_free_fast_reg_page_list(fr_desc->data_frpl);
595 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
597 struct fast_reg_descriptor *fr_desc;
598 struct isert_device *device = isert_conn->device;
599 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
600 struct se_node_acl *se_nacl = se_sess->se_node_acl;
603 * Setup the number of FRMRs based upon the number of tags
604 * available to session in iscsi_target_locate_portal().
606 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
607 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
609 isert_conn->fr_pool_size = 0;
610 for (i = 0; i < tag_num; i++) {
611 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
613 isert_err("Failed to allocate fast_reg descriptor\n");
618 ret = isert_create_fr_desc(device->ib_device,
619 device->pd, fr_desc);
621 isert_err("Failed to create fastreg descriptor err=%d\n",
627 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
628 isert_conn->fr_pool_size++;
631 isert_dbg("Creating conn %p fastreg pool size=%d",
632 isert_conn, isert_conn->fr_pool_size);
637 isert_conn_free_fastreg_pool(isert_conn);
642 isert_init_conn(struct isert_conn *isert_conn)
644 isert_conn->state = ISER_CONN_INIT;
645 INIT_LIST_HEAD(&isert_conn->accept_node);
646 init_completion(&isert_conn->login_comp);
647 init_completion(&isert_conn->login_req_comp);
648 init_completion(&isert_conn->wait);
649 kref_init(&isert_conn->kref);
650 mutex_init(&isert_conn->mutex);
651 spin_lock_init(&isert_conn->pool_lock);
652 INIT_LIST_HEAD(&isert_conn->fr_pool);
653 INIT_WORK(&isert_conn->release_work, isert_release_work);
657 isert_free_login_buf(struct isert_conn *isert_conn)
659 struct ib_device *ib_dev = isert_conn->device->ib_device;
661 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
662 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
663 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
664 ISCSI_DEF_MAX_RECV_SEG_LEN,
666 kfree(isert_conn->login_buf);
670 isert_alloc_login_buf(struct isert_conn *isert_conn,
671 struct ib_device *ib_dev)
675 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
676 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
677 if (!isert_conn->login_buf) {
678 isert_err("Unable to allocate isert_conn->login_buf\n");
682 isert_conn->login_req_buf = isert_conn->login_buf;
683 isert_conn->login_rsp_buf = isert_conn->login_buf +
684 ISCSI_DEF_MAX_RECV_SEG_LEN;
686 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
687 isert_conn->login_buf, isert_conn->login_req_buf,
688 isert_conn->login_rsp_buf);
690 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
691 (void *)isert_conn->login_req_buf,
692 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
694 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
696 isert_err("login_req_dma mapping error: %d\n", ret);
697 isert_conn->login_req_dma = 0;
701 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
702 (void *)isert_conn->login_rsp_buf,
703 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
705 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
707 isert_err("login_rsp_dma mapping error: %d\n", ret);
708 isert_conn->login_rsp_dma = 0;
709 goto out_req_dma_map;
715 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
716 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
718 kfree(isert_conn->login_buf);
723 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
725 struct isert_np *isert_np = cma_id->context;
726 struct iscsi_np *np = isert_np->np;
727 struct isert_conn *isert_conn;
728 struct isert_device *device;
731 spin_lock_bh(&np->np_thread_lock);
733 spin_unlock_bh(&np->np_thread_lock);
734 isert_dbg("iscsi_np is not enabled, reject connect request\n");
735 return rdma_reject(cma_id, NULL, 0);
737 spin_unlock_bh(&np->np_thread_lock);
739 isert_dbg("cma_id: %p, portal: %p\n",
740 cma_id, cma_id->context);
742 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
746 isert_init_conn(isert_conn);
747 isert_conn->cm_id = cma_id;
749 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
753 device = isert_device_get(cma_id);
754 if (IS_ERR(device)) {
755 ret = PTR_ERR(device);
756 goto out_rsp_dma_map;
758 isert_conn->device = device;
760 /* Set max inflight RDMA READ requests */
761 isert_conn->initiator_depth = min_t(u8,
762 event->param.conn.initiator_depth,
763 device->dev_attr.max_qp_init_rd_atom);
764 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
766 ret = isert_conn_setup_qp(isert_conn, cma_id);
770 ret = isert_rdma_post_recvl(isert_conn);
774 ret = isert_rdma_accept(isert_conn);
778 mutex_lock(&isert_np->np_accept_mutex);
779 list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list);
780 mutex_unlock(&isert_np->np_accept_mutex);
782 isert_info("np %p: Allow accept_np to continue\n", np);
783 up(&isert_np->np_sem);
787 isert_device_put(device);
789 isert_free_login_buf(isert_conn);
792 rdma_reject(cma_id, NULL, 0);
797 isert_connect_release(struct isert_conn *isert_conn)
799 struct isert_device *device = isert_conn->device;
801 isert_dbg("conn %p\n", isert_conn);
805 if (device->use_fastreg)
806 isert_conn_free_fastreg_pool(isert_conn);
808 isert_free_rx_descriptors(isert_conn);
809 if (isert_conn->cm_id)
810 rdma_destroy_id(isert_conn->cm_id);
812 if (isert_conn->qp) {
813 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
815 isert_comp_put(comp);
816 ib_destroy_qp(isert_conn->qp);
819 if (isert_conn->login_buf)
820 isert_free_login_buf(isert_conn);
822 isert_device_put(device);
828 isert_connected_handler(struct rdma_cm_id *cma_id)
830 struct isert_conn *isert_conn = cma_id->qp->qp_context;
832 isert_info("conn %p\n", isert_conn);
834 if (!kref_get_unless_zero(&isert_conn->kref)) {
835 isert_warn("conn %p connect_release is running\n", isert_conn);
839 mutex_lock(&isert_conn->mutex);
840 if (isert_conn->state != ISER_CONN_FULL_FEATURE)
841 isert_conn->state = ISER_CONN_UP;
842 mutex_unlock(&isert_conn->mutex);
846 isert_release_kref(struct kref *kref)
848 struct isert_conn *isert_conn = container_of(kref,
849 struct isert_conn, kref);
851 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
854 isert_connect_release(isert_conn);
858 isert_put_conn(struct isert_conn *isert_conn)
860 kref_put(&isert_conn->kref, isert_release_kref);
864 * isert_conn_terminate() - Initiate connection termination
865 * @isert_conn: isert connection struct
868 * In case the connection state is FULL_FEATURE, move state
869 * to TEMINATING and start teardown sequence (rdma_disconnect).
870 * In case the connection state is UP, complete flush as well.
872 * This routine must be called with mutex held. Thus it is
873 * safe to call multiple times.
876 isert_conn_terminate(struct isert_conn *isert_conn)
880 switch (isert_conn->state) {
881 case ISER_CONN_TERMINATING:
884 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
885 isert_info("Terminating conn %p state %d\n",
886 isert_conn, isert_conn->state);
887 isert_conn->state = ISER_CONN_TERMINATING;
888 err = rdma_disconnect(isert_conn->cm_id);
890 isert_warn("Failed rdma_disconnect isert_conn %p\n",
894 isert_warn("conn %p teminating in state %d\n",
895 isert_conn, isert_conn->state);
900 isert_np_cma_handler(struct isert_np *isert_np,
901 enum rdma_cm_event_type event)
903 isert_dbg("isert np %p, handling event %d\n", isert_np, event);
906 case RDMA_CM_EVENT_DEVICE_REMOVAL:
907 isert_np->np_cm_id = NULL;
909 case RDMA_CM_EVENT_ADDR_CHANGE:
910 isert_np->np_cm_id = isert_setup_id(isert_np);
911 if (IS_ERR(isert_np->np_cm_id)) {
912 isert_err("isert np %p setup id failed: %ld\n",
913 isert_np, PTR_ERR(isert_np->np_cm_id));
914 isert_np->np_cm_id = NULL;
918 isert_err("isert np %p Unexpected event %d\n",
926 isert_disconnected_handler(struct rdma_cm_id *cma_id,
927 enum rdma_cm_event_type event)
929 struct isert_np *isert_np = cma_id->context;
930 struct isert_conn *isert_conn;
931 bool terminating = false;
933 if (isert_np->np_cm_id == cma_id)
934 return isert_np_cma_handler(cma_id->context, event);
936 isert_conn = cma_id->qp->qp_context;
938 mutex_lock(&isert_conn->mutex);
939 terminating = (isert_conn->state == ISER_CONN_TERMINATING);
940 isert_conn_terminate(isert_conn);
941 mutex_unlock(&isert_conn->mutex);
943 isert_info("conn %p completing wait\n", isert_conn);
944 complete(&isert_conn->wait);
949 mutex_lock(&isert_np->np_accept_mutex);
950 if (!list_empty(&isert_conn->accept_node)) {
951 list_del_init(&isert_conn->accept_node);
952 isert_put_conn(isert_conn);
953 queue_work(isert_release_wq, &isert_conn->release_work);
955 mutex_unlock(&isert_np->np_accept_mutex);
962 isert_connect_error(struct rdma_cm_id *cma_id)
964 struct isert_conn *isert_conn = cma_id->qp->qp_context;
966 isert_conn->cm_id = NULL;
967 isert_put_conn(isert_conn);
973 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
977 isert_info("event %d status %d id %p np %p\n", event->event,
978 event->status, cma_id, cma_id->context);
980 switch (event->event) {
981 case RDMA_CM_EVENT_CONNECT_REQUEST:
982 ret = isert_connect_request(cma_id, event);
984 isert_err("failed handle connect request %d\n", ret);
986 case RDMA_CM_EVENT_ESTABLISHED:
987 isert_connected_handler(cma_id);
989 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
990 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
991 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
992 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
993 ret = isert_disconnected_handler(cma_id, event->event);
995 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
996 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
997 case RDMA_CM_EVENT_CONNECT_ERROR:
998 ret = isert_connect_error(cma_id);
1001 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
1009 isert_post_recv(struct isert_conn *isert_conn, u32 count)
1011 struct ib_recv_wr *rx_wr, *rx_wr_failed;
1013 unsigned int rx_head = isert_conn->rx_desc_head;
1014 struct iser_rx_desc *rx_desc;
1016 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1017 rx_desc = &isert_conn->rx_descs[rx_head];
1018 rx_wr->wr_id = (uintptr_t)rx_desc;
1019 rx_wr->sg_list = &rx_desc->rx_sg;
1021 rx_wr->next = rx_wr + 1;
1022 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
1026 rx_wr->next = NULL; /* mark end of work requests list */
1028 isert_conn->post_recv_buf_count += count;
1029 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
1032 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1033 isert_conn->post_recv_buf_count -= count;
1035 isert_dbg("Posted %d RX buffers\n", count);
1036 isert_conn->rx_desc_head = rx_head;
1042 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1044 struct ib_device *ib_dev = isert_conn->cm_id->device;
1045 struct ib_send_wr send_wr, *send_wr_failed;
1048 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1049 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1051 send_wr.next = NULL;
1052 send_wr.wr_id = (uintptr_t)tx_desc;
1053 send_wr.sg_list = tx_desc->tx_sg;
1054 send_wr.num_sge = tx_desc->num_sge;
1055 send_wr.opcode = IB_WR_SEND;
1056 send_wr.send_flags = IB_SEND_SIGNALED;
1058 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1060 isert_err("ib_post_send() failed, ret: %d\n", ret);
1066 isert_create_send_desc(struct isert_conn *isert_conn,
1067 struct isert_cmd *isert_cmd,
1068 struct iser_tx_desc *tx_desc)
1070 struct isert_device *device = isert_conn->device;
1071 struct ib_device *ib_dev = device->ib_device;
1073 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1074 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1076 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1077 tx_desc->iser_header.flags = ISER_VER;
1079 tx_desc->num_sge = 1;
1080 tx_desc->isert_cmd = isert_cmd;
1082 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
1083 tx_desc->tx_sg[0].lkey = device->mr->lkey;
1084 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1089 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1090 struct iser_tx_desc *tx_desc)
1092 struct isert_device *device = isert_conn->device;
1093 struct ib_device *ib_dev = device->ib_device;
1096 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1097 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1098 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1099 isert_err("ib_dma_mapping_error() failed\n");
1103 tx_desc->dma_addr = dma_addr;
1104 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1105 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1106 tx_desc->tx_sg[0].lkey = device->mr->lkey;
1108 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1109 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1110 tx_desc->tx_sg[0].lkey);
1116 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1117 struct ib_send_wr *send_wr)
1119 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1121 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1122 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1123 send_wr->opcode = IB_WR_SEND;
1124 send_wr->sg_list = &tx_desc->tx_sg[0];
1125 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1126 send_wr->send_flags = IB_SEND_SIGNALED;
1130 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1132 struct ib_recv_wr rx_wr, *rx_wr_fail;
1136 memset(&sge, 0, sizeof(struct ib_sge));
1137 sge.addr = isert_conn->login_req_dma;
1138 sge.length = ISER_RX_LOGIN_SIZE;
1139 sge.lkey = isert_conn->device->mr->lkey;
1141 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1142 sge.addr, sge.length, sge.lkey);
1144 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1145 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1146 rx_wr.sg_list = &sge;
1149 isert_conn->post_recv_buf_count++;
1150 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1152 isert_err("ib_post_recv() failed: %d\n", ret);
1153 isert_conn->post_recv_buf_count--;
1160 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1163 struct isert_conn *isert_conn = conn->context;
1164 struct isert_device *device = isert_conn->device;
1165 struct ib_device *ib_dev = device->ib_device;
1166 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1169 isert_create_send_desc(isert_conn, NULL, tx_desc);
1171 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1172 sizeof(struct iscsi_hdr));
1174 isert_init_tx_hdrs(isert_conn, tx_desc);
1177 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1179 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1180 length, DMA_TO_DEVICE);
1182 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1184 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1185 length, DMA_TO_DEVICE);
1187 tx_dsg->addr = isert_conn->login_rsp_dma;
1188 tx_dsg->length = length;
1189 tx_dsg->lkey = isert_conn->device->mr->lkey;
1190 tx_desc->num_sge = 2;
1192 if (!login->login_failed) {
1193 if (login->login_complete) {
1194 if (!conn->sess->sess_ops->SessionType &&
1195 isert_conn->device->use_fastreg) {
1196 ret = isert_conn_create_fastreg_pool(isert_conn);
1198 isert_err("Conn: %p failed to create"
1199 " fastreg pool\n", isert_conn);
1204 ret = isert_alloc_rx_descriptors(isert_conn);
1208 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1212 /* Now we are in FULL_FEATURE phase */
1213 mutex_lock(&isert_conn->mutex);
1214 isert_conn->state = ISER_CONN_FULL_FEATURE;
1215 mutex_unlock(&isert_conn->mutex);
1219 ret = isert_rdma_post_recvl(isert_conn);
1224 ret = isert_post_send(isert_conn, tx_desc);
1232 isert_rx_login_req(struct isert_conn *isert_conn)
1234 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1235 int rx_buflen = isert_conn->login_req_len;
1236 struct iscsi_conn *conn = isert_conn->conn;
1237 struct iscsi_login *login = conn->conn_login;
1240 isert_info("conn %p\n", isert_conn);
1242 WARN_ON_ONCE(!login);
1244 if (login->first_request) {
1245 struct iscsi_login_req *login_req =
1246 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1248 * Setup the initial iscsi_login values from the leading
1249 * login request PDU.
1251 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1252 login->current_stage =
1253 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1255 login->version_min = login_req->min_version;
1256 login->version_max = login_req->max_version;
1257 memcpy(login->isid, login_req->isid, 6);
1258 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1259 login->init_task_tag = login_req->itt;
1260 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1261 login->cid = be16_to_cpu(login_req->cid);
1262 login->tsih = be16_to_cpu(login_req->tsih);
1265 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1267 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1268 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1269 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1270 MAX_KEY_VALUE_PAIRS);
1271 memcpy(login->req_buf, &rx_desc->data[0], size);
1273 if (login->first_request) {
1274 complete(&isert_conn->login_comp);
1277 schedule_delayed_work(&conn->login_work, 0);
1280 static struct iscsi_cmd
1281 *isert_allocate_cmd(struct iscsi_conn *conn)
1283 struct isert_conn *isert_conn = conn->context;
1284 struct isert_cmd *isert_cmd;
1285 struct iscsi_cmd *cmd;
1287 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1289 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1292 isert_cmd = iscsit_priv_cmd(cmd);
1293 isert_cmd->conn = isert_conn;
1294 isert_cmd->iscsi_cmd = cmd;
1300 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1301 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1302 struct iser_rx_desc *rx_desc, unsigned char *buf)
1304 struct iscsi_conn *conn = isert_conn->conn;
1305 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1306 struct scatterlist *sg;
1307 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1308 bool dump_payload = false;
1310 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1314 imm_data = cmd->immediate_data;
1315 imm_data_len = cmd->first_burst_len;
1316 unsol_data = cmd->unsolicited_data;
1318 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1321 } else if (rc > 0) {
1322 dump_payload = true;
1329 sg = &cmd->se_cmd.t_data_sg[0];
1330 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1332 isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1333 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1335 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1337 cmd->write_data_done += imm_data_len;
1339 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1340 spin_lock_bh(&cmd->istate_lock);
1341 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1342 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1343 spin_unlock_bh(&cmd->istate_lock);
1347 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1349 if (!rc && dump_payload == false && unsol_data)
1350 iscsit_set_unsoliticed_dataout(cmd);
1351 else if (dump_payload && imm_data)
1352 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1358 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1359 struct iser_rx_desc *rx_desc, unsigned char *buf)
1361 struct scatterlist *sg_start;
1362 struct iscsi_conn *conn = isert_conn->conn;
1363 struct iscsi_cmd *cmd = NULL;
1364 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1365 u32 unsol_data_len = ntoh24(hdr->dlength);
1366 int rc, sg_nents, sg_off, page_off;
1368 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1374 * FIXME: Unexpected unsolicited_data out
1376 if (!cmd->unsolicited_data) {
1377 isert_err("Received unexpected solicited data payload\n");
1382 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1383 "write_data_done: %u, data_length: %u\n",
1384 unsol_data_len, cmd->write_data_done,
1385 cmd->se_cmd.data_length);
1387 sg_off = cmd->write_data_done / PAGE_SIZE;
1388 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1389 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1390 page_off = cmd->write_data_done % PAGE_SIZE;
1392 * FIXME: Non page-aligned unsolicited_data out
1395 isert_err("unexpected non-page aligned data payload\n");
1399 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1400 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1401 sg_nents, &rx_desc->data[0], unsol_data_len);
1403 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1406 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1414 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1415 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1418 struct iscsi_conn *conn = isert_conn->conn;
1419 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1422 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1426 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1429 return iscsit_process_nop_out(conn, cmd, hdr);
1433 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1434 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1435 struct iscsi_text *hdr)
1437 struct iscsi_conn *conn = isert_conn->conn;
1438 u32 payload_length = ntoh24(hdr->dlength);
1440 unsigned char *text_in = NULL;
1442 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1446 if (payload_length) {
1447 text_in = kzalloc(payload_length, GFP_KERNEL);
1449 isert_err("Unable to allocate text_in of payload_length: %u\n",
1454 cmd->text_in_ptr = text_in;
1456 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1458 return iscsit_process_text_cmd(conn, cmd, hdr);
1462 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1463 uint32_t read_stag, uint64_t read_va,
1464 uint32_t write_stag, uint64_t write_va)
1466 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1467 struct iscsi_conn *conn = isert_conn->conn;
1468 struct iscsi_cmd *cmd;
1469 struct isert_cmd *isert_cmd;
1471 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1473 if (conn->sess->sess_ops->SessionType &&
1474 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1475 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1476 " ignoring\n", opcode);
1481 case ISCSI_OP_SCSI_CMD:
1482 cmd = isert_allocate_cmd(conn);
1486 isert_cmd = iscsit_priv_cmd(cmd);
1487 isert_cmd->read_stag = read_stag;
1488 isert_cmd->read_va = read_va;
1489 isert_cmd->write_stag = write_stag;
1490 isert_cmd->write_va = write_va;
1492 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1493 rx_desc, (unsigned char *)hdr);
1495 case ISCSI_OP_NOOP_OUT:
1496 cmd = isert_allocate_cmd(conn);
1500 isert_cmd = iscsit_priv_cmd(cmd);
1501 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1502 rx_desc, (unsigned char *)hdr);
1504 case ISCSI_OP_SCSI_DATA_OUT:
1505 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1506 (unsigned char *)hdr);
1508 case ISCSI_OP_SCSI_TMFUNC:
1509 cmd = isert_allocate_cmd(conn);
1513 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1514 (unsigned char *)hdr);
1516 case ISCSI_OP_LOGOUT:
1517 cmd = isert_allocate_cmd(conn);
1521 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1524 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) {
1525 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1529 cmd = isert_allocate_cmd(conn);
1534 isert_cmd = iscsit_priv_cmd(cmd);
1535 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1536 rx_desc, (struct iscsi_text *)hdr);
1539 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1548 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1550 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1551 uint64_t read_va = 0, write_va = 0;
1552 uint32_t read_stag = 0, write_stag = 0;
1555 switch (iser_hdr->flags & 0xF0) {
1557 if (iser_hdr->flags & ISER_RSV) {
1558 read_stag = be32_to_cpu(iser_hdr->read_stag);
1559 read_va = be64_to_cpu(iser_hdr->read_va);
1560 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1561 read_stag, (unsigned long long)read_va);
1563 if (iser_hdr->flags & ISER_WSV) {
1564 write_stag = be32_to_cpu(iser_hdr->write_stag);
1565 write_va = be64_to_cpu(iser_hdr->write_va);
1566 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1567 write_stag, (unsigned long long)write_va);
1570 isert_dbg("ISER ISCSI_CTRL PDU\n");
1573 isert_err("iSER Hello message\n");
1576 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1580 rc = isert_rx_opcode(isert_conn, rx_desc,
1581 read_stag, read_va, write_stag, write_va);
1585 isert_rcv_completion(struct iser_rx_desc *desc,
1586 struct isert_conn *isert_conn,
1589 struct ib_device *ib_dev = isert_conn->cm_id->device;
1590 struct iscsi_hdr *hdr;
1592 int rx_buflen, outstanding;
1594 if ((char *)desc == isert_conn->login_req_buf) {
1595 rx_dma = isert_conn->login_req_dma;
1596 rx_buflen = ISER_RX_LOGIN_SIZE;
1597 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1600 rx_dma = desc->dma_addr;
1601 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1602 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1606 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1608 hdr = &desc->iscsi_header;
1609 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1610 hdr->opcode, hdr->itt, hdr->flags,
1611 (int)(xfer_len - ISER_HEADERS_LEN));
1613 if ((char *)desc == isert_conn->login_req_buf) {
1614 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1615 if (isert_conn->conn) {
1616 struct iscsi_login *login = isert_conn->conn->conn_login;
1618 if (login && !login->first_request)
1619 isert_rx_login_req(isert_conn);
1621 mutex_lock(&isert_conn->mutex);
1622 complete(&isert_conn->login_req_comp);
1623 mutex_unlock(&isert_conn->mutex);
1625 isert_rx_do_work(desc, isert_conn);
1628 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1631 isert_conn->post_recv_buf_count--;
1632 isert_dbg("Decremented post_recv_buf_count: %d\n",
1633 isert_conn->post_recv_buf_count);
1635 if ((char *)desc == isert_conn->login_req_buf)
1638 outstanding = isert_conn->post_recv_buf_count;
1639 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1640 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1641 ISERT_MIN_POSTED_RX);
1642 err = isert_post_recv(isert_conn, count);
1644 isert_err("isert_post_recv() count: %d failed, %d\n",
1651 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1652 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1653 enum iser_ib_op_code op, struct isert_data_buf *data)
1655 struct ib_device *ib_dev = isert_conn->cm_id->device;
1657 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1658 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1660 data->len = length - offset;
1661 data->offset = offset;
1662 data->sg_off = data->offset / PAGE_SIZE;
1664 data->sg = &sg[data->sg_off];
1665 data->nents = min_t(unsigned int, nents - data->sg_off,
1666 ISCSI_ISER_SG_TABLESIZE);
1667 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1670 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1672 if (unlikely(!data->dma_nents)) {
1673 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1677 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1678 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1684 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1686 struct ib_device *ib_dev = isert_conn->cm_id->device;
1688 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1689 memset(data, 0, sizeof(*data));
1695 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1697 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1699 isert_dbg("Cmd %p\n", isert_cmd);
1702 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1703 isert_unmap_data_buf(isert_conn, &wr->data);
1707 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1713 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1720 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1722 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1724 isert_dbg("Cmd %p\n", isert_cmd);
1727 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1728 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1729 isert_unmap_data_buf(isert_conn, &wr->prot);
1730 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1732 spin_lock_bh(&isert_conn->pool_lock);
1733 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1734 spin_unlock_bh(&isert_conn->pool_lock);
1739 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1740 isert_unmap_data_buf(isert_conn, &wr->data);
1748 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1750 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1751 struct isert_conn *isert_conn = isert_cmd->conn;
1752 struct iscsi_conn *conn = isert_conn->conn;
1753 struct isert_device *device = isert_conn->device;
1754 struct iscsi_text_rsp *hdr;
1756 isert_dbg("Cmd %p\n", isert_cmd);
1758 switch (cmd->iscsi_opcode) {
1759 case ISCSI_OP_SCSI_CMD:
1760 spin_lock_bh(&conn->cmd_lock);
1761 if (!list_empty(&cmd->i_conn_node))
1762 list_del_init(&cmd->i_conn_node);
1763 spin_unlock_bh(&conn->cmd_lock);
1765 if (cmd->data_direction == DMA_TO_DEVICE) {
1766 iscsit_stop_dataout_timer(cmd);
1768 * Check for special case during comp_err where
1769 * WRITE_PENDING has been handed off from core,
1770 * but requires an extra target_put_sess_cmd()
1771 * before transport_generic_free_cmd() below.
1774 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1775 struct se_cmd *se_cmd = &cmd->se_cmd;
1777 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1781 device->unreg_rdma_mem(isert_cmd, isert_conn);
1782 transport_generic_free_cmd(&cmd->se_cmd, 0);
1784 case ISCSI_OP_SCSI_TMFUNC:
1785 spin_lock_bh(&conn->cmd_lock);
1786 if (!list_empty(&cmd->i_conn_node))
1787 list_del_init(&cmd->i_conn_node);
1788 spin_unlock_bh(&conn->cmd_lock);
1790 transport_generic_free_cmd(&cmd->se_cmd, 0);
1792 case ISCSI_OP_REJECT:
1793 case ISCSI_OP_NOOP_OUT:
1795 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1796 /* If the continue bit is on, keep the command alive */
1797 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1800 spin_lock_bh(&conn->cmd_lock);
1801 if (!list_empty(&cmd->i_conn_node))
1802 list_del_init(&cmd->i_conn_node);
1803 spin_unlock_bh(&conn->cmd_lock);
1806 * Handle special case for REJECT when iscsi_add_reject*() has
1807 * overwritten the original iscsi_opcode assignment, and the
1808 * associated cmd->se_cmd needs to be released.
1810 if (cmd->se_cmd.se_tfo != NULL) {
1811 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1813 transport_generic_free_cmd(&cmd->se_cmd, 0);
1820 iscsit_release_cmd(cmd);
1826 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1828 if (tx_desc->dma_addr != 0) {
1829 isert_dbg("unmap single for tx_desc->dma_addr\n");
1830 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1831 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1832 tx_desc->dma_addr = 0;
1837 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1838 struct ib_device *ib_dev, bool comp_err)
1840 if (isert_cmd->pdu_buf_dma != 0) {
1841 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1842 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1843 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1844 isert_cmd->pdu_buf_dma = 0;
1847 isert_unmap_tx_desc(tx_desc, ib_dev);
1848 isert_put_cmd(isert_cmd, comp_err);
1852 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1854 struct ib_mr_status mr_status;
1857 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1859 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1860 goto fail_mr_status;
1863 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1865 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1867 switch (mr_status.sig_err.err_type) {
1868 case IB_SIG_BAD_GUARD:
1869 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1871 case IB_SIG_BAD_REFTAG:
1872 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1874 case IB_SIG_BAD_APPTAG:
1875 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1878 sec_offset_err = mr_status.sig_err.sig_err_offset;
1879 do_div(sec_offset_err, block_size);
1880 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1882 isert_err("PI error found type %d at sector 0x%llx "
1883 "expected 0x%x vs actual 0x%x\n",
1884 mr_status.sig_err.err_type,
1885 (unsigned long long)se_cmd->bad_sector,
1886 mr_status.sig_err.expected,
1887 mr_status.sig_err.actual);
1896 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1897 struct isert_cmd *isert_cmd)
1899 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1900 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1901 struct se_cmd *se_cmd = &cmd->se_cmd;
1902 struct isert_conn *isert_conn = isert_cmd->conn;
1903 struct isert_device *device = isert_conn->device;
1906 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1907 ret = isert_check_pi_status(se_cmd,
1908 wr->fr_desc->pi_ctx->sig_mr);
1909 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1912 device->unreg_rdma_mem(isert_cmd, isert_conn);
1913 wr->send_wr_num = 0;
1915 transport_send_check_condition_and_sense(se_cmd,
1918 isert_put_response(isert_conn->conn, cmd);
1922 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1923 struct isert_cmd *isert_cmd)
1925 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1926 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1927 struct se_cmd *se_cmd = &cmd->se_cmd;
1928 struct isert_conn *isert_conn = isert_cmd->conn;
1929 struct isert_device *device = isert_conn->device;
1932 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1933 ret = isert_check_pi_status(se_cmd,
1934 wr->fr_desc->pi_ctx->sig_mr);
1935 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1938 iscsit_stop_dataout_timer(cmd);
1939 device->unreg_rdma_mem(isert_cmd, isert_conn);
1940 cmd->write_data_done = wr->data.len;
1941 wr->send_wr_num = 0;
1943 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1944 spin_lock_bh(&cmd->istate_lock);
1945 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1946 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1947 spin_unlock_bh(&cmd->istate_lock);
1950 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1951 transport_send_check_condition_and_sense(se_cmd,
1954 target_execute_cmd(se_cmd);
1959 isert_do_control_comp(struct work_struct *work)
1961 struct isert_cmd *isert_cmd = container_of(work,
1962 struct isert_cmd, comp_work);
1963 struct isert_conn *isert_conn = isert_cmd->conn;
1964 struct ib_device *ib_dev = isert_conn->cm_id->device;
1965 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1967 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1969 switch (cmd->i_state) {
1970 case ISTATE_SEND_TASKMGTRSP:
1971 iscsit_tmr_post_handler(cmd, cmd->conn);
1972 case ISTATE_SEND_REJECT: /* FALLTHRU */
1973 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1974 cmd->i_state = ISTATE_SENT_STATUS;
1975 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1978 case ISTATE_SEND_LOGOUTRSP:
1979 iscsit_logout_post_handler(cmd, cmd->conn);
1982 isert_err("Unknown i_state %d\n", cmd->i_state);
1989 isert_response_completion(struct iser_tx_desc *tx_desc,
1990 struct isert_cmd *isert_cmd,
1991 struct isert_conn *isert_conn,
1992 struct ib_device *ib_dev)
1994 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1996 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1997 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1998 cmd->i_state == ISTATE_SEND_REJECT ||
1999 cmd->i_state == ISTATE_SEND_TEXTRSP) {
2000 isert_unmap_tx_desc(tx_desc, ib_dev);
2002 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2003 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2007 cmd->i_state = ISTATE_SENT_STATUS;
2008 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2012 isert_snd_completion(struct iser_tx_desc *tx_desc,
2013 struct isert_conn *isert_conn)
2015 struct ib_device *ib_dev = isert_conn->cm_id->device;
2016 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2017 struct isert_rdma_wr *wr;
2020 isert_unmap_tx_desc(tx_desc, ib_dev);
2023 wr = &isert_cmd->rdma_wr;
2025 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2027 switch (wr->iser_ib_op) {
2029 isert_response_completion(tx_desc, isert_cmd,
2030 isert_conn, ib_dev);
2032 case ISER_IB_RDMA_WRITE:
2033 isert_completion_rdma_write(tx_desc, isert_cmd);
2035 case ISER_IB_RDMA_READ:
2036 isert_completion_rdma_read(tx_desc, isert_cmd);
2039 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2046 * is_isert_tx_desc() - Indicate if the completion wr_id
2047 * is a TX descriptor or not.
2048 * @isert_conn: iser connection
2049 * @wr_id: completion WR identifier
2051 * Since we cannot rely on wc opcode in FLUSH errors
2052 * we must work around it by checking if the wr_id address
2053 * falls in the iser connection rx_descs buffer. If so
2054 * it is an RX descriptor, otherwize it is a TX.
2057 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2059 void *start = isert_conn->rx_descs;
2060 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2062 if (wr_id >= start && wr_id < start + len)
2069 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2071 if (wc->wr_id == ISER_BEACON_WRID) {
2072 isert_info("conn %p completing wait_comp_err\n",
2074 complete(&isert_conn->wait_comp_err);
2075 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2076 struct ib_device *ib_dev = isert_conn->cm_id->device;
2077 struct isert_cmd *isert_cmd;
2078 struct iser_tx_desc *desc;
2080 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2081 isert_cmd = desc->isert_cmd;
2083 isert_unmap_tx_desc(desc, ib_dev);
2085 isert_completion_put(desc, isert_cmd, ib_dev, true);
2087 isert_conn->post_recv_buf_count--;
2088 if (!isert_conn->post_recv_buf_count)
2089 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2094 isert_handle_wc(struct ib_wc *wc)
2096 struct isert_conn *isert_conn;
2097 struct iser_tx_desc *tx_desc;
2098 struct iser_rx_desc *rx_desc;
2100 isert_conn = wc->qp->qp_context;
2101 if (likely(wc->status == IB_WC_SUCCESS)) {
2102 if (wc->opcode == IB_WC_RECV) {
2103 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2104 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2106 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2107 isert_snd_completion(tx_desc, isert_conn);
2110 if (wc->status != IB_WC_WR_FLUSH_ERR)
2111 isert_err("wr id %llx status %d vend_err %x\n",
2112 wc->wr_id, wc->status, wc->vendor_err);
2114 isert_dbg("flush error: wr id %llx\n", wc->wr_id);
2116 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2117 isert_cq_comp_err(isert_conn, wc);
2122 isert_cq_work(struct work_struct *work)
2124 enum { isert_poll_budget = 65536 };
2125 struct isert_comp *comp = container_of(work, struct isert_comp,
2127 struct ib_wc *const wcs = comp->wcs;
2128 int i, n, completed = 0;
2130 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2131 for (i = 0; i < n; i++)
2132 isert_handle_wc(&wcs[i]);
2135 if (completed >= isert_poll_budget)
2139 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2143 isert_cq_callback(struct ib_cq *cq, void *context)
2145 struct isert_comp *comp = context;
2147 queue_work(isert_comp_wq, &comp->work);
2151 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2153 struct ib_send_wr *wr_failed;
2156 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2159 isert_err("ib_post_send failed with %d\n", ret);
2166 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2168 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2169 struct isert_conn *isert_conn = conn->context;
2170 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2171 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2172 &isert_cmd->tx_desc.iscsi_header;
2174 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2175 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2176 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2178 * Attach SENSE DATA payload to iSCSI Response PDU
2180 if (cmd->se_cmd.sense_buffer &&
2181 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2182 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2183 struct isert_device *device = isert_conn->device;
2184 struct ib_device *ib_dev = device->ib_device;
2185 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2186 u32 padding, pdu_len;
2188 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2190 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2192 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2193 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2194 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2196 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2197 (void *)cmd->sense_buffer, pdu_len,
2200 isert_cmd->pdu_buf_len = pdu_len;
2201 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2202 tx_dsg->length = pdu_len;
2203 tx_dsg->lkey = device->mr->lkey;
2204 isert_cmd->tx_desc.num_sge = 2;
2207 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2209 isert_dbg("Posting SCSI Response\n");
2211 return isert_post_response(isert_conn, isert_cmd);
2215 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2217 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2218 struct isert_conn *isert_conn = conn->context;
2219 struct isert_device *device = isert_conn->device;
2221 spin_lock_bh(&conn->cmd_lock);
2222 if (!list_empty(&cmd->i_conn_node))
2223 list_del_init(&cmd->i_conn_node);
2224 spin_unlock_bh(&conn->cmd_lock);
2226 if (cmd->data_direction == DMA_TO_DEVICE)
2227 iscsit_stop_dataout_timer(cmd);
2229 device->unreg_rdma_mem(isert_cmd, isert_conn);
2232 static enum target_prot_op
2233 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2235 struct isert_conn *isert_conn = conn->context;
2236 struct isert_device *device = isert_conn->device;
2238 if (conn->tpg->tpg_attrib.t10_pi) {
2239 if (device->pi_capable) {
2240 isert_info("conn %p PI offload enabled\n", isert_conn);
2241 isert_conn->pi_support = true;
2242 return TARGET_PROT_ALL;
2246 isert_info("conn %p PI offload disabled\n", isert_conn);
2247 isert_conn->pi_support = false;
2249 return TARGET_PROT_NORMAL;
2253 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2254 bool nopout_response)
2256 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2257 struct isert_conn *isert_conn = conn->context;
2258 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2260 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2261 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2262 &isert_cmd->tx_desc.iscsi_header,
2264 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2265 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2267 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2269 return isert_post_response(isert_conn, isert_cmd);
2273 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2275 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2276 struct isert_conn *isert_conn = conn->context;
2277 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2279 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2280 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2281 &isert_cmd->tx_desc.iscsi_header);
2282 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2283 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2285 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2287 return isert_post_response(isert_conn, isert_cmd);
2291 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2293 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2294 struct isert_conn *isert_conn = conn->context;
2295 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2297 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2298 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2299 &isert_cmd->tx_desc.iscsi_header);
2300 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2301 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2303 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2305 return isert_post_response(isert_conn, isert_cmd);
2309 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2311 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2312 struct isert_conn *isert_conn = conn->context;
2313 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2314 struct isert_device *device = isert_conn->device;
2315 struct ib_device *ib_dev = device->ib_device;
2316 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2317 struct iscsi_reject *hdr =
2318 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2320 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2321 iscsit_build_reject(cmd, conn, hdr);
2322 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2324 hton24(hdr->dlength, ISCSI_HDR_LEN);
2325 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2326 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2328 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2329 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2330 tx_dsg->length = ISCSI_HDR_LEN;
2331 tx_dsg->lkey = device->mr->lkey;
2332 isert_cmd->tx_desc.num_sge = 2;
2334 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2336 isert_dbg("conn %p Posting Reject\n", isert_conn);
2338 return isert_post_response(isert_conn, isert_cmd);
2342 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2344 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2345 struct isert_conn *isert_conn = conn->context;
2346 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2347 struct iscsi_text_rsp *hdr =
2348 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2352 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2353 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2358 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2361 struct isert_device *device = isert_conn->device;
2362 struct ib_device *ib_dev = device->ib_device;
2363 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2364 void *txt_rsp_buf = cmd->buf_ptr;
2366 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2367 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2369 isert_cmd->pdu_buf_len = txt_rsp_len;
2370 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2371 tx_dsg->length = txt_rsp_len;
2372 tx_dsg->lkey = device->mr->lkey;
2373 isert_cmd->tx_desc.num_sge = 2;
2375 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2377 isert_dbg("conn %p Text Response\n", isert_conn);
2379 return isert_post_response(isert_conn, isert_cmd);
2383 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2384 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2385 u32 data_left, u32 offset)
2387 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2388 struct scatterlist *sg_start, *tmp_sg;
2389 struct isert_device *device = isert_conn->device;
2390 struct ib_device *ib_dev = device->ib_device;
2391 u32 sg_off, page_off;
2392 int i = 0, sg_nents;
2394 sg_off = offset / PAGE_SIZE;
2395 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2396 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2397 page_off = offset % PAGE_SIZE;
2399 send_wr->sg_list = ib_sge;
2400 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2402 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2404 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2405 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2407 (unsigned long long)tmp_sg->dma_address,
2408 tmp_sg->length, page_off);
2410 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2411 ib_sge->length = min_t(u32, data_left,
2412 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2413 ib_sge->lkey = device->mr->lkey;
2415 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2416 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2418 data_left -= ib_sge->length;
2422 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2425 send_wr->num_sge = ++i;
2426 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2427 send_wr->sg_list, send_wr->num_sge);
2429 return send_wr->num_sge;
2433 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434 struct isert_rdma_wr *wr)
2436 struct se_cmd *se_cmd = &cmd->se_cmd;
2437 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2438 struct isert_conn *isert_conn = conn->context;
2439 struct isert_data_buf *data = &wr->data;
2440 struct ib_send_wr *send_wr;
2441 struct ib_sge *ib_sge;
2442 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2443 int ret = 0, i, ib_sge_cnt;
2445 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2447 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2448 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2449 se_cmd->t_data_nents, se_cmd->data_length,
2450 offset, wr->iser_ib_op, &wr->data);
2454 data_left = data->len;
2455 offset = data->offset;
2457 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2459 isert_warn("Unable to allocate ib_sge\n");
2463 wr->ib_sge = ib_sge;
2465 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2466 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2469 isert_dbg("Unable to allocate wr->send_wr\n");
2474 wr->isert_cmd = isert_cmd;
2475 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2477 for (i = 0; i < wr->send_wr_num; i++) {
2478 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2479 data_len = min(data_left, rdma_write_max);
2481 send_wr->send_flags = 0;
2482 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2483 send_wr->opcode = IB_WR_RDMA_WRITE;
2484 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2485 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2486 if (i + 1 == wr->send_wr_num)
2487 send_wr->next = &isert_cmd->tx_desc.send_wr;
2489 send_wr->next = &wr->send_wr[i + 1];
2491 send_wr->opcode = IB_WR_RDMA_READ;
2492 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2493 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2494 if (i + 1 == wr->send_wr_num)
2495 send_wr->send_flags = IB_SEND_SIGNALED;
2497 send_wr->next = &wr->send_wr[i + 1];
2500 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2501 send_wr, data_len, offset);
2502 ib_sge += ib_sge_cnt;
2505 va_offset += data_len;
2506 data_left -= data_len;
2511 isert_unmap_data_buf(isert_conn, data);
2517 isert_map_fr_pagelist(struct ib_device *ib_dev,
2518 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2520 u64 start_addr, end_addr, page, chunk_start = 0;
2521 struct scatterlist *tmp_sg;
2522 int i = 0, new_chunk, last_ent, n_pages;
2526 last_ent = sg_nents - 1;
2527 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2528 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2530 chunk_start = start_addr;
2531 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2533 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
2534 i, (unsigned long long)tmp_sg->dma_address,
2537 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2543 page = chunk_start & PAGE_MASK;
2545 fr_pl[n_pages++] = page;
2546 isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
2549 } while (page < end_addr);
2556 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2560 memset(inv_wr, 0, sizeof(*inv_wr));
2561 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2562 inv_wr->opcode = IB_WR_LOCAL_INV;
2563 inv_wr->ex.invalidate_rkey = mr->rkey;
2566 rkey = ib_inc_rkey(mr->rkey);
2567 ib_update_fast_reg_key(mr, rkey);
2571 isert_fast_reg_mr(struct isert_conn *isert_conn,
2572 struct fast_reg_descriptor *fr_desc,
2573 struct isert_data_buf *mem,
2574 enum isert_indicator ind,
2577 struct isert_device *device = isert_conn->device;
2578 struct ib_device *ib_dev = device->ib_device;
2580 struct ib_fast_reg_page_list *frpl;
2581 struct ib_send_wr fr_wr, inv_wr;
2582 struct ib_send_wr *bad_wr, *wr = NULL;
2583 int ret, pagelist_len;
2586 if (mem->dma_nents == 1) {
2587 sge->lkey = device->mr->lkey;
2588 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2589 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2590 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2591 sge->addr, sge->length, sge->lkey);
2595 if (ind == ISERT_DATA_KEY_VALID) {
2596 /* Registering data buffer */
2597 mr = fr_desc->data_mr;
2598 frpl = fr_desc->data_frpl;
2600 /* Registering protection buffer */
2601 mr = fr_desc->pi_ctx->prot_mr;
2602 frpl = fr_desc->pi_ctx->prot_frpl;
2605 page_off = mem->offset % PAGE_SIZE;
2607 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2608 fr_desc, mem->nents, mem->offset);
2610 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2611 &frpl->page_list[0]);
2613 if (!(fr_desc->ind & ind)) {
2614 isert_inv_rkey(&inv_wr, mr);
2618 /* Prepare FASTREG WR */
2619 memset(&fr_wr, 0, sizeof(fr_wr));
2620 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2621 fr_wr.opcode = IB_WR_FAST_REG_MR;
2622 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2623 fr_wr.wr.fast_reg.page_list = frpl;
2624 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2625 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2626 fr_wr.wr.fast_reg.length = mem->len;
2627 fr_wr.wr.fast_reg.rkey = mr->rkey;
2628 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2635 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2637 isert_err("fast registration failed, ret:%d\n", ret);
2640 fr_desc->ind &= ~ind;
2642 sge->lkey = mr->lkey;
2643 sge->addr = frpl->page_list[0] + page_off;
2644 sge->length = mem->len;
2646 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2647 sge->addr, sge->length, sge->lkey);
2653 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2654 struct ib_sig_domain *domain)
2656 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2657 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2658 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2659 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2661 * At the moment we hard code those, but if in the future
2662 * the target core would like to use it, we will take it
2665 domain->sig.dif.apptag_check_mask = 0xffff;
2666 domain->sig.dif.app_escape = true;
2667 domain->sig.dif.ref_escape = true;
2668 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2669 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2670 domain->sig.dif.ref_remap = true;
2674 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2676 switch (se_cmd->prot_op) {
2677 case TARGET_PROT_DIN_INSERT:
2678 case TARGET_PROT_DOUT_STRIP:
2679 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2680 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2682 case TARGET_PROT_DOUT_INSERT:
2683 case TARGET_PROT_DIN_STRIP:
2684 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2685 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2687 case TARGET_PROT_DIN_PASS:
2688 case TARGET_PROT_DOUT_PASS:
2689 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2690 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2693 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2701 isert_set_prot_checks(u8 prot_checks)
2703 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2704 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2705 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2709 isert_reg_sig_mr(struct isert_conn *isert_conn,
2710 struct se_cmd *se_cmd,
2711 struct isert_rdma_wr *rdma_wr,
2712 struct fast_reg_descriptor *fr_desc)
2714 struct ib_send_wr sig_wr, inv_wr;
2715 struct ib_send_wr *bad_wr, *wr = NULL;
2716 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2717 struct ib_sig_attrs sig_attrs;
2720 memset(&sig_attrs, 0, sizeof(sig_attrs));
2721 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2725 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2727 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2728 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2732 memset(&sig_wr, 0, sizeof(sig_wr));
2733 sig_wr.opcode = IB_WR_REG_SIG_MR;
2734 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2735 sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2737 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2738 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2739 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2740 if (se_cmd->t_prot_sg)
2741 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2748 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2750 isert_err("fast registration failed, ret:%d\n", ret);
2753 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2755 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2756 rdma_wr->ib_sg[SIG].addr = 0;
2757 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2758 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2759 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2761 * We have protection guards on the wire
2762 * so we need to set a larget transfer
2764 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2766 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2767 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2768 rdma_wr->ib_sg[SIG].lkey);
2774 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2775 struct isert_cmd *isert_cmd,
2776 struct isert_rdma_wr *wr)
2778 struct isert_device *device = isert_conn->device;
2779 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2782 if (!wr->fr_desc->pi_ctx) {
2783 ret = isert_create_pi_ctx(wr->fr_desc,
2787 isert_err("conn %p failed to allocate pi_ctx\n",
2793 if (se_cmd->t_prot_sg) {
2794 ret = isert_map_data_buf(isert_conn, isert_cmd,
2796 se_cmd->t_prot_nents,
2797 se_cmd->prot_length,
2798 0, wr->iser_ib_op, &wr->prot);
2800 isert_err("conn %p failed to map protection buffer\n",
2805 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2806 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2807 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2809 isert_err("conn %p failed to fast reg mr\n",
2811 goto unmap_prot_cmd;
2815 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2817 isert_err("conn %p failed to fast reg mr\n",
2819 goto unmap_prot_cmd;
2821 wr->fr_desc->ind |= ISERT_PROTECTED;
2826 if (se_cmd->t_prot_sg)
2827 isert_unmap_data_buf(isert_conn, &wr->prot);
2833 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2834 struct isert_rdma_wr *wr)
2836 struct se_cmd *se_cmd = &cmd->se_cmd;
2837 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2838 struct isert_conn *isert_conn = conn->context;
2839 struct fast_reg_descriptor *fr_desc = NULL;
2840 struct ib_send_wr *send_wr;
2841 struct ib_sge *ib_sg;
2844 unsigned long flags;
2846 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2848 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2849 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2850 se_cmd->t_data_nents, se_cmd->data_length,
2851 offset, wr->iser_ib_op, &wr->data);
2855 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2856 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2857 fr_desc = list_first_entry(&isert_conn->fr_pool,
2858 struct fast_reg_descriptor, list);
2859 list_del(&fr_desc->list);
2860 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2861 wr->fr_desc = fr_desc;
2864 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2865 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2869 if (isert_prot_cmd(isert_conn, se_cmd)) {
2870 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2874 ib_sg = &wr->ib_sg[SIG];
2876 ib_sg = &wr->ib_sg[DATA];
2879 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2880 wr->ib_sge = &wr->s_ib_sge;
2881 wr->send_wr_num = 1;
2882 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2883 wr->send_wr = &wr->s_send_wr;
2884 wr->isert_cmd = isert_cmd;
2886 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2887 send_wr->sg_list = &wr->s_ib_sge;
2888 send_wr->num_sge = 1;
2889 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2890 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2891 send_wr->opcode = IB_WR_RDMA_WRITE;
2892 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2893 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2894 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2895 0 : IB_SEND_SIGNALED;
2897 send_wr->opcode = IB_WR_RDMA_READ;
2898 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2899 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2900 send_wr->send_flags = IB_SEND_SIGNALED;
2907 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2908 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2909 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2911 isert_unmap_data_buf(isert_conn, &wr->data);
2917 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2919 struct se_cmd *se_cmd = &cmd->se_cmd;
2920 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2921 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2922 struct isert_conn *isert_conn = conn->context;
2923 struct isert_device *device = isert_conn->device;
2924 struct ib_send_wr *wr_failed;
2927 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2928 isert_cmd, se_cmd->data_length);
2930 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2931 rc = device->reg_rdma_mem(conn, cmd, wr);
2933 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2937 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2939 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2941 isert_create_send_desc(isert_conn, isert_cmd,
2942 &isert_cmd->tx_desc);
2943 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2944 &isert_cmd->tx_desc.iscsi_header);
2945 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2946 isert_init_send_wr(isert_conn, isert_cmd,
2947 &isert_cmd->tx_desc.send_wr);
2948 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2949 wr->send_wr_num += 1;
2952 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2954 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2956 if (!isert_prot_cmd(isert_conn, se_cmd))
2957 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2958 "READ\n", isert_cmd);
2960 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2967 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2969 struct se_cmd *se_cmd = &cmd->se_cmd;
2970 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2971 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2972 struct isert_conn *isert_conn = conn->context;
2973 struct isert_device *device = isert_conn->device;
2974 struct ib_send_wr *wr_failed;
2977 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2978 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2979 wr->iser_ib_op = ISER_IB_RDMA_READ;
2980 rc = device->reg_rdma_mem(conn, cmd, wr);
2982 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2986 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2988 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2990 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2997 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3002 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3003 ret = isert_put_nopin(cmd, conn, false);
3006 isert_err("Unknown immediate state: 0x%02x\n", state);
3015 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3017 struct isert_conn *isert_conn = conn->context;
3021 case ISTATE_SEND_LOGOUTRSP:
3022 ret = isert_put_logout_rsp(cmd, conn);
3024 isert_conn->logout_posted = true;
3026 case ISTATE_SEND_NOPIN:
3027 ret = isert_put_nopin(cmd, conn, true);
3029 case ISTATE_SEND_TASKMGTRSP:
3030 ret = isert_put_tm_rsp(cmd, conn);
3032 case ISTATE_SEND_REJECT:
3033 ret = isert_put_reject(cmd, conn);
3035 case ISTATE_SEND_TEXTRSP:
3036 ret = isert_put_text_rsp(cmd, conn);
3038 case ISTATE_SEND_STATUS:
3040 * Special case for sending non GOOD SCSI status from TX thread
3041 * context during pre se_cmd excecution failure.
3043 ret = isert_put_response(conn, cmd);
3046 isert_err("Unknown response state: 0x%02x\n", state);
3055 isert_setup_id(struct isert_np *isert_np)
3057 struct iscsi_np *np = isert_np->np;
3058 struct rdma_cm_id *id;
3059 struct sockaddr *sa;
3062 sa = (struct sockaddr *)&np->np_sockaddr;
3063 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3065 id = rdma_create_id(isert_cma_handler, isert_np,
3066 RDMA_PS_TCP, IB_QPT_RC);
3068 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3072 isert_dbg("id %p context %p\n", id, id->context);
3074 ret = rdma_bind_addr(id, sa);
3076 isert_err("rdma_bind_addr() failed: %d\n", ret);
3080 ret = rdma_listen(id, 0);
3082 isert_err("rdma_listen() failed: %d\n", ret);
3088 rdma_destroy_id(id);
3090 return ERR_PTR(ret);
3094 isert_setup_np(struct iscsi_np *np,
3095 struct __kernel_sockaddr_storage *ksockaddr)
3097 struct isert_np *isert_np;
3098 struct rdma_cm_id *isert_lid;
3101 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3103 isert_err("Unable to allocate struct isert_np\n");
3106 sema_init(&isert_np->np_sem, 0);
3107 mutex_init(&isert_np->np_accept_mutex);
3108 INIT_LIST_HEAD(&isert_np->np_accept_list);
3109 init_completion(&isert_np->np_login_comp);
3113 * Setup the np->np_sockaddr from the passed sockaddr setup
3114 * in iscsi_target_configfs.c code..
3116 memcpy(&np->np_sockaddr, ksockaddr,
3117 sizeof(struct __kernel_sockaddr_storage));
3119 isert_lid = isert_setup_id(isert_np);
3120 if (IS_ERR(isert_lid)) {
3121 ret = PTR_ERR(isert_lid);
3125 isert_np->np_cm_id = isert_lid;
3126 np->np_context = isert_np;
3137 isert_rdma_accept(struct isert_conn *isert_conn)
3139 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3140 struct rdma_conn_param cp;
3143 memset(&cp, 0, sizeof(struct rdma_conn_param));
3144 cp.initiator_depth = isert_conn->initiator_depth;
3146 cp.rnr_retry_count = 7;
3148 ret = rdma_accept(cm_id, &cp);
3150 isert_err("rdma_accept() failed with: %d\n", ret);
3158 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3160 struct isert_conn *isert_conn = conn->context;
3163 isert_info("before login_req comp conn: %p\n", isert_conn);
3164 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3166 isert_err("isert_conn %p interrupted before got login req\n",
3170 reinit_completion(&isert_conn->login_req_comp);
3173 * For login requests after the first PDU, isert_rx_login_req() will
3174 * kick schedule_delayed_work(&conn->login_work) as the packet is
3175 * received, which turns this callback from iscsi_target_do_login_rx()
3178 if (!login->first_request)
3181 isert_rx_login_req(isert_conn);
3183 isert_info("before login_comp conn: %p\n", conn);
3184 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3188 isert_info("processing login->req: %p\n", login->req);
3194 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3195 struct isert_conn *isert_conn)
3197 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3198 struct rdma_route *cm_route = &cm_id->route;
3199 struct sockaddr_in *sock_in;
3200 struct sockaddr_in6 *sock_in6;
3202 conn->login_family = np->np_sockaddr.ss_family;
3204 if (np->np_sockaddr.ss_family == AF_INET6) {
3205 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3206 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3207 &sock_in6->sin6_addr.in6_u);
3208 conn->login_port = ntohs(sock_in6->sin6_port);
3210 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3211 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3212 &sock_in6->sin6_addr.in6_u);
3213 conn->local_port = ntohs(sock_in6->sin6_port);
3215 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3216 sprintf(conn->login_ip, "%pI4",
3217 &sock_in->sin_addr.s_addr);
3218 conn->login_port = ntohs(sock_in->sin_port);
3220 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3221 sprintf(conn->local_ip, "%pI4",
3222 &sock_in->sin_addr.s_addr);
3223 conn->local_port = ntohs(sock_in->sin_port);
3228 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3230 struct isert_np *isert_np = np->np_context;
3231 struct isert_conn *isert_conn;
3235 ret = down_interruptible(&isert_np->np_sem);
3239 spin_lock_bh(&np->np_thread_lock);
3240 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3241 spin_unlock_bh(&np->np_thread_lock);
3242 isert_dbg("np_thread_state %d\n",
3243 np->np_thread_state);
3245 * No point in stalling here when np_thread
3246 * is in state RESET/SHUTDOWN/EXIT - bail
3250 spin_unlock_bh(&np->np_thread_lock);
3252 mutex_lock(&isert_np->np_accept_mutex);
3253 if (list_empty(&isert_np->np_accept_list)) {
3254 mutex_unlock(&isert_np->np_accept_mutex);
3257 isert_conn = list_first_entry(&isert_np->np_accept_list,
3258 struct isert_conn, accept_node);
3259 list_del_init(&isert_conn->accept_node);
3260 mutex_unlock(&isert_np->np_accept_mutex);
3262 conn->context = isert_conn;
3263 isert_conn->conn = conn;
3265 isert_set_conn_info(np, conn, isert_conn);
3267 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3273 isert_free_np(struct iscsi_np *np)
3275 struct isert_np *isert_np = np->np_context;
3276 struct isert_conn *isert_conn, *n;
3278 if (isert_np->np_cm_id)
3279 rdma_destroy_id(isert_np->np_cm_id);
3282 * FIXME: At this point we don't have a good way to insure
3283 * that at this point we don't have hanging connections that
3284 * completed RDMA establishment but didn't start iscsi login
3285 * process. So work-around this by cleaning up what ever piled
3286 * up in np_accept_list.
3288 mutex_lock(&isert_np->np_accept_mutex);
3289 if (!list_empty(&isert_np->np_accept_list)) {
3290 isert_info("Still have isert connections, cleaning up...\n");
3291 list_for_each_entry_safe(isert_conn, n,
3292 &isert_np->np_accept_list,
3294 isert_info("cleaning isert_conn %p state (%d)\n",
3295 isert_conn, isert_conn->state);
3296 isert_connect_release(isert_conn);
3299 mutex_unlock(&isert_np->np_accept_mutex);
3301 np->np_context = NULL;
3305 static void isert_release_work(struct work_struct *work)
3307 struct isert_conn *isert_conn = container_of(work,
3311 isert_info("Starting release conn %p\n", isert_conn);
3313 wait_for_completion(&isert_conn->wait);
3315 mutex_lock(&isert_conn->mutex);
3316 isert_conn->state = ISER_CONN_DOWN;
3317 mutex_unlock(&isert_conn->mutex);
3319 isert_info("Destroying conn %p\n", isert_conn);
3320 isert_put_conn(isert_conn);
3324 isert_wait4logout(struct isert_conn *isert_conn)
3326 struct iscsi_conn *conn = isert_conn->conn;
3328 isert_info("conn %p\n", isert_conn);
3330 if (isert_conn->logout_posted) {
3331 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3332 wait_for_completion_timeout(&conn->conn_logout_comp,
3333 SECONDS_FOR_LOGOUT_COMP * HZ);
3338 isert_wait4cmds(struct iscsi_conn *conn)
3340 isert_info("iscsi_conn %p\n", conn);
3343 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3344 target_wait_for_sess_cmds(conn->sess->se_sess);
3349 isert_wait4flush(struct isert_conn *isert_conn)
3351 struct ib_recv_wr *bad_wr;
3353 isert_info("conn %p\n", isert_conn);
3355 init_completion(&isert_conn->wait_comp_err);
3356 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3357 /* post an indication that all flush errors were consumed */
3358 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3359 isert_err("conn %p failed to post beacon", isert_conn);
3363 wait_for_completion(&isert_conn->wait_comp_err);
3366 static void isert_wait_conn(struct iscsi_conn *conn)
3368 struct isert_conn *isert_conn = conn->context;
3370 isert_info("Starting conn %p\n", isert_conn);
3372 mutex_lock(&isert_conn->mutex);
3374 * Only wait for wait_comp_err if the isert_conn made it
3375 * into full feature phase..
3377 if (isert_conn->state == ISER_CONN_INIT) {
3378 mutex_unlock(&isert_conn->mutex);
3381 isert_conn_terminate(isert_conn);
3382 mutex_unlock(&isert_conn->mutex);
3384 isert_wait4cmds(conn);
3385 isert_wait4flush(isert_conn);
3386 isert_wait4logout(isert_conn);
3388 queue_work(isert_release_wq, &isert_conn->release_work);
3391 static void isert_free_conn(struct iscsi_conn *conn)
3393 struct isert_conn *isert_conn = conn->context;
3395 isert_put_conn(isert_conn);
3398 static struct iscsit_transport iser_target_transport = {
3400 .transport_type = ISCSI_INFINIBAND,
3401 .priv_size = sizeof(struct isert_cmd),
3402 .owner = THIS_MODULE,
3403 .iscsit_setup_np = isert_setup_np,
3404 .iscsit_accept_np = isert_accept_np,
3405 .iscsit_free_np = isert_free_np,
3406 .iscsit_wait_conn = isert_wait_conn,
3407 .iscsit_free_conn = isert_free_conn,
3408 .iscsit_get_login_rx = isert_get_login_rx,
3409 .iscsit_put_login_tx = isert_put_login_tx,
3410 .iscsit_immediate_queue = isert_immediate_queue,
3411 .iscsit_response_queue = isert_response_queue,
3412 .iscsit_get_dataout = isert_get_dataout,
3413 .iscsit_queue_data_in = isert_put_datain,
3414 .iscsit_queue_status = isert_put_response,
3415 .iscsit_aborted_task = isert_aborted_task,
3416 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3419 static int __init isert_init(void)
3423 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3424 WQ_UNBOUND | WQ_HIGHPRI, 0);
3425 if (!isert_comp_wq) {
3426 isert_err("Unable to allocate isert_comp_wq\n");
3431 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3432 WQ_UNBOUND_MAX_ACTIVE);
3433 if (!isert_release_wq) {
3434 isert_err("Unable to allocate isert_release_wq\n");
3436 goto destroy_comp_wq;
3439 iscsit_register_transport(&iser_target_transport);
3440 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3445 destroy_workqueue(isert_comp_wq);
3450 static void __exit isert_exit(void)
3452 flush_scheduled_work();
3453 destroy_workqueue(isert_release_wq);
3454 destroy_workqueue(isert_comp_wq);
3455 iscsit_unregister_transport(&iser_target_transport);
3456 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3459 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3460 MODULE_VERSION("1.0");
3461 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3462 MODULE_LICENSE("GPL");
3464 module_init(isert_init);
3465 module_exit(isert_exit);