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 <linux/llist.h>
26 #include <rdma/ib_verbs.h>
27 #include <rdma/rdma_cm.h>
28 #include <target/target_core_base.h>
29 #include <target/target_core_fabric.h>
30 #include <target/iscsi/iscsi_transport.h>
31 #include <linux/semaphore.h>
33 #include "isert_proto.h"
36 #define ISERT_MAX_CONN 8
37 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
38 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
40 static DEFINE_MUTEX(device_list_mutex);
41 static LIST_HEAD(device_list);
42 static struct workqueue_struct *isert_rx_wq;
43 static struct workqueue_struct *isert_comp_wq;
46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
49 struct isert_rdma_wr *wr);
51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
54 struct isert_rdma_wr *wr);
56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
59 isert_qp_event_callback(struct ib_event *e, void *context)
61 struct isert_conn *isert_conn = (struct isert_conn *)context;
63 pr_err("isert_qp_event_callback event: %d\n", e->event);
65 case IB_EVENT_COMM_EST:
66 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
68 case IB_EVENT_QP_LAST_WQE_REACHED:
69 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
81 ret = ib_query_device(ib_dev, devattr);
83 pr_err("ib_query_device() failed: %d\n", ret);
86 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
87 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
96 struct isert_device *device = isert_conn->conn_device;
97 struct ib_qp_init_attr attr;
98 int ret, index, min_index = 0;
100 mutex_lock(&device_list_mutex);
101 for (index = 0; index < device->cqs_used; index++)
102 if (device->cq_active_qps[index] <
103 device->cq_active_qps[min_index])
105 device->cq_active_qps[min_index]++;
106 pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
107 mutex_unlock(&device_list_mutex);
109 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
110 attr.event_handler = isert_qp_event_callback;
111 attr.qp_context = isert_conn;
112 attr.send_cq = device->dev_tx_cq[min_index];
113 attr.recv_cq = device->dev_rx_cq[min_index];
114 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
115 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
117 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
118 * work-around for RDMA_READ..
120 attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
121 isert_conn->max_sge = attr.cap.max_send_sge;
123 attr.cap.max_recv_sge = 1;
124 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
125 attr.qp_type = IB_QPT_RC;
127 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
129 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
131 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
132 isert_conn->conn_pd->device);
134 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
136 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
139 isert_conn->conn_qp = cma_id->qp;
140 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
146 isert_cq_event_callback(struct ib_event *e, void *context)
148 pr_debug("isert_cq_event_callback event: %d\n", e->event);
152 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
154 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
155 struct iser_rx_desc *rx_desc;
156 struct ib_sge *rx_sg;
160 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
161 sizeof(struct iser_rx_desc), GFP_KERNEL);
162 if (!isert_conn->conn_rx_descs)
165 rx_desc = isert_conn->conn_rx_descs;
167 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
168 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
169 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
170 if (ib_dma_mapping_error(ib_dev, dma_addr))
173 rx_desc->dma_addr = dma_addr;
175 rx_sg = &rx_desc->rx_sg;
176 rx_sg->addr = rx_desc->dma_addr;
177 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
178 rx_sg->lkey = isert_conn->conn_mr->lkey;
181 isert_conn->conn_rx_desc_head = 0;
185 rx_desc = isert_conn->conn_rx_descs;
186 for (j = 0; j < i; j++, rx_desc++) {
187 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
188 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
190 kfree(isert_conn->conn_rx_descs);
191 isert_conn->conn_rx_descs = NULL;
197 isert_free_rx_descriptors(struct isert_conn *isert_conn)
199 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
200 struct iser_rx_desc *rx_desc;
203 if (!isert_conn->conn_rx_descs)
206 rx_desc = isert_conn->conn_rx_descs;
207 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
208 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
212 kfree(isert_conn->conn_rx_descs);
213 isert_conn->conn_rx_descs = NULL;
216 static void isert_cq_tx_work(struct work_struct *);
217 static void isert_cq_tx_callback(struct ib_cq *, void *);
218 static void isert_cq_rx_work(struct work_struct *);
219 static void isert_cq_rx_callback(struct ib_cq *, void *);
222 isert_create_device_ib_res(struct isert_device *device)
224 struct ib_device *ib_dev = device->ib_device;
225 struct isert_cq_desc *cq_desc;
226 struct ib_device_attr *dev_attr;
229 dev_attr = &device->dev_attr;
230 ret = isert_query_device(ib_dev, dev_attr);
234 /* asign function handlers */
235 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
236 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
237 device->use_fastreg = 1;
238 device->reg_rdma_mem = isert_reg_rdma;
239 device->unreg_rdma_mem = isert_unreg_rdma;
241 device->use_fastreg = 0;
242 device->reg_rdma_mem = isert_map_rdma;
243 device->unreg_rdma_mem = isert_unmap_cmd;
246 /* Check signature cap */
247 device->pi_capable = dev_attr->device_cap_flags &
248 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
250 device->cqs_used = min_t(int, num_online_cpus(),
251 device->ib_device->num_comp_vectors);
252 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
253 pr_debug("Using %d CQs, device %s supports %d vectors support "
254 "Fast registration %d pi_capable %d\n",
255 device->cqs_used, device->ib_device->name,
256 device->ib_device->num_comp_vectors, device->use_fastreg,
258 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
259 device->cqs_used, GFP_KERNEL);
260 if (!device->cq_desc) {
261 pr_err("Unable to allocate device->cq_desc\n");
264 cq_desc = device->cq_desc;
266 for (i = 0; i < device->cqs_used; i++) {
267 cq_desc[i].device = device;
268 cq_desc[i].cq_index = i;
270 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
271 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
272 isert_cq_rx_callback,
273 isert_cq_event_callback,
275 ISER_MAX_RX_CQ_LEN, i);
276 if (IS_ERR(device->dev_rx_cq[i])) {
277 ret = PTR_ERR(device->dev_rx_cq[i]);
278 device->dev_rx_cq[i] = NULL;
282 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
283 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
284 isert_cq_tx_callback,
285 isert_cq_event_callback,
287 ISER_MAX_TX_CQ_LEN, i);
288 if (IS_ERR(device->dev_tx_cq[i])) {
289 ret = PTR_ERR(device->dev_tx_cq[i]);
290 device->dev_tx_cq[i] = NULL;
294 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
298 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
306 for (j = 0; j < i; j++) {
307 cq_desc = &device->cq_desc[j];
309 if (device->dev_rx_cq[j]) {
310 cancel_work_sync(&cq_desc->cq_rx_work);
311 ib_destroy_cq(device->dev_rx_cq[j]);
313 if (device->dev_tx_cq[j]) {
314 cancel_work_sync(&cq_desc->cq_tx_work);
315 ib_destroy_cq(device->dev_tx_cq[j]);
318 kfree(device->cq_desc);
324 isert_free_device_ib_res(struct isert_device *device)
326 struct isert_cq_desc *cq_desc;
329 for (i = 0; i < device->cqs_used; i++) {
330 cq_desc = &device->cq_desc[i];
332 cancel_work_sync(&cq_desc->cq_rx_work);
333 cancel_work_sync(&cq_desc->cq_tx_work);
334 ib_destroy_cq(device->dev_rx_cq[i]);
335 ib_destroy_cq(device->dev_tx_cq[i]);
336 device->dev_rx_cq[i] = NULL;
337 device->dev_tx_cq[i] = NULL;
340 kfree(device->cq_desc);
344 isert_device_try_release(struct isert_device *device)
346 mutex_lock(&device_list_mutex);
348 if (!device->refcount) {
349 isert_free_device_ib_res(device);
350 list_del(&device->dev_node);
353 mutex_unlock(&device_list_mutex);
356 static struct isert_device *
357 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
359 struct isert_device *device;
362 mutex_lock(&device_list_mutex);
363 list_for_each_entry(device, &device_list, dev_node) {
364 if (device->ib_device->node_guid == cma_id->device->node_guid) {
366 mutex_unlock(&device_list_mutex);
371 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
373 mutex_unlock(&device_list_mutex);
374 return ERR_PTR(-ENOMEM);
377 INIT_LIST_HEAD(&device->dev_node);
379 device->ib_device = cma_id->device;
380 ret = isert_create_device_ib_res(device);
383 mutex_unlock(&device_list_mutex);
388 list_add_tail(&device->dev_node, &device_list);
389 mutex_unlock(&device_list_mutex);
395 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
397 struct fast_reg_descriptor *fr_desc, *tmp;
400 if (list_empty(&isert_conn->conn_fr_pool))
403 pr_debug("Freeing conn %p fastreg pool", isert_conn);
405 list_for_each_entry_safe(fr_desc, tmp,
406 &isert_conn->conn_fr_pool, list) {
407 list_del(&fr_desc->list);
408 ib_free_fast_reg_page_list(fr_desc->data_frpl);
409 ib_dereg_mr(fr_desc->data_mr);
410 if (fr_desc->pi_ctx) {
411 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
412 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
413 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
414 kfree(fr_desc->pi_ctx);
420 if (i < isert_conn->conn_fr_pool_size)
421 pr_warn("Pool still has %d regions registered\n",
422 isert_conn->conn_fr_pool_size - i);
426 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
427 struct fast_reg_descriptor *fr_desc, u8 protection)
431 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
432 ISCSI_ISER_SG_TABLESIZE);
433 if (IS_ERR(fr_desc->data_frpl)) {
434 pr_err("Failed to allocate data frpl err=%ld\n",
435 PTR_ERR(fr_desc->data_frpl));
436 return PTR_ERR(fr_desc->data_frpl);
439 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
440 if (IS_ERR(fr_desc->data_mr)) {
441 pr_err("Failed to allocate data frmr err=%ld\n",
442 PTR_ERR(fr_desc->data_mr));
443 ret = PTR_ERR(fr_desc->data_mr);
446 pr_debug("Create fr_desc %p page_list %p\n",
447 fr_desc, fr_desc->data_frpl->page_list);
448 fr_desc->ind |= ISERT_DATA_KEY_VALID;
451 struct ib_mr_init_attr mr_init_attr = {0};
452 struct pi_context *pi_ctx;
454 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
455 if (!fr_desc->pi_ctx) {
456 pr_err("Failed to allocate pi context\n");
460 pi_ctx = fr_desc->pi_ctx;
462 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
463 ISCSI_ISER_SG_TABLESIZE);
464 if (IS_ERR(pi_ctx->prot_frpl)) {
465 pr_err("Failed to allocate prot frpl err=%ld\n",
466 PTR_ERR(pi_ctx->prot_frpl));
467 ret = PTR_ERR(pi_ctx->prot_frpl);
471 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
472 if (IS_ERR(pi_ctx->prot_mr)) {
473 pr_err("Failed to allocate prot frmr err=%ld\n",
474 PTR_ERR(pi_ctx->prot_mr));
475 ret = PTR_ERR(pi_ctx->prot_mr);
478 fr_desc->ind |= ISERT_PROT_KEY_VALID;
480 mr_init_attr.max_reg_descriptors = 2;
481 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
482 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
483 if (IS_ERR(pi_ctx->sig_mr)) {
484 pr_err("Failed to allocate signature enabled mr err=%ld\n",
485 PTR_ERR(pi_ctx->sig_mr));
486 ret = PTR_ERR(pi_ctx->sig_mr);
489 fr_desc->ind |= ISERT_SIG_KEY_VALID;
491 fr_desc->ind &= ~ISERT_PROTECTED;
495 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
497 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
499 kfree(fr_desc->pi_ctx);
501 ib_dereg_mr(fr_desc->data_mr);
503 ib_free_fast_reg_page_list(fr_desc->data_frpl);
509 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
511 struct fast_reg_descriptor *fr_desc;
512 struct isert_device *device = isert_conn->conn_device;
513 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
517 * Setup the number of FRMRs based upon the number of tags
518 * available to session in iscsi_target_locate_portal().
520 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
521 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
523 isert_conn->conn_fr_pool_size = 0;
524 for (i = 0; i < tag_num; i++) {
525 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
527 pr_err("Failed to allocate fast_reg descriptor\n");
532 ret = isert_create_fr_desc(device->ib_device,
533 isert_conn->conn_pd, fr_desc,
536 pr_err("Failed to create fastreg descriptor err=%d\n",
542 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
543 isert_conn->conn_fr_pool_size++;
546 pr_debug("Creating conn %p fastreg pool size=%d",
547 isert_conn, isert_conn->conn_fr_pool_size);
552 isert_conn_free_fastreg_pool(isert_conn);
557 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
559 struct iscsi_np *np = cma_id->context;
560 struct isert_np *isert_np = np->np_context;
561 struct isert_conn *isert_conn;
562 struct isert_device *device;
563 struct ib_device *ib_dev = cma_id->device;
567 spin_lock_bh(&np->np_thread_lock);
569 spin_unlock_bh(&np->np_thread_lock);
570 pr_debug("iscsi_np is not enabled, reject connect request\n");
571 return rdma_reject(cma_id, NULL, 0);
573 spin_unlock_bh(&np->np_thread_lock);
575 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
576 cma_id, cma_id->context);
578 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
580 pr_err("Unable to allocate isert_conn\n");
583 isert_conn->state = ISER_CONN_INIT;
584 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
585 init_completion(&isert_conn->conn_login_comp);
586 init_completion(&isert_conn->conn_wait);
587 init_completion(&isert_conn->conn_wait_comp_err);
588 kref_init(&isert_conn->conn_kref);
589 mutex_init(&isert_conn->conn_mutex);
590 spin_lock_init(&isert_conn->conn_lock);
591 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
593 cma_id->context = isert_conn;
594 isert_conn->conn_cm_id = cma_id;
596 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
597 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
598 if (!isert_conn->login_buf) {
599 pr_err("Unable to allocate isert_conn->login_buf\n");
604 isert_conn->login_req_buf = isert_conn->login_buf;
605 isert_conn->login_rsp_buf = isert_conn->login_buf +
606 ISCSI_DEF_MAX_RECV_SEG_LEN;
607 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
608 isert_conn->login_buf, isert_conn->login_req_buf,
609 isert_conn->login_rsp_buf);
611 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
612 (void *)isert_conn->login_req_buf,
613 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
615 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
617 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
619 isert_conn->login_req_dma = 0;
623 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
624 (void *)isert_conn->login_rsp_buf,
625 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
627 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
629 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
631 isert_conn->login_rsp_dma = 0;
632 goto out_req_dma_map;
635 device = isert_device_find_by_ib_dev(cma_id);
636 if (IS_ERR(device)) {
637 ret = PTR_ERR(device);
638 goto out_rsp_dma_map;
641 /* Set max inflight RDMA READ requests */
642 isert_conn->initiator_depth = min_t(u8,
643 event->param.conn.initiator_depth,
644 device->dev_attr.max_qp_init_rd_atom);
645 pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
647 isert_conn->conn_device = device;
648 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
649 if (IS_ERR(isert_conn->conn_pd)) {
650 ret = PTR_ERR(isert_conn->conn_pd);
651 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
656 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
657 IB_ACCESS_LOCAL_WRITE);
658 if (IS_ERR(isert_conn->conn_mr)) {
659 ret = PTR_ERR(isert_conn->conn_mr);
660 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
665 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
666 if (pi_support && !device->pi_capable) {
667 pr_err("Protection information requested but not supported, "
668 "rejecting connect request\n");
669 ret = rdma_reject(cma_id, NULL, 0);
673 ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
677 mutex_lock(&isert_np->np_accept_mutex);
678 list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
679 mutex_unlock(&isert_np->np_accept_mutex);
681 pr_debug("isert_connect_request() up np_sem np: %p\n", np);
682 up(&isert_np->np_sem);
686 ib_dereg_mr(isert_conn->conn_mr);
688 ib_dealloc_pd(isert_conn->conn_pd);
690 isert_device_try_release(device);
692 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
693 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
695 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
696 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
698 kfree(isert_conn->login_buf);
705 isert_connect_release(struct isert_conn *isert_conn)
707 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
708 struct isert_device *device = isert_conn->conn_device;
711 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
713 if (device && device->use_fastreg)
714 isert_conn_free_fastreg_pool(isert_conn);
716 if (isert_conn->conn_qp) {
717 cq_index = ((struct isert_cq_desc *)
718 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
719 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
720 isert_conn->conn_device->cq_active_qps[cq_index]--;
722 rdma_destroy_qp(isert_conn->conn_cm_id);
725 isert_free_rx_descriptors(isert_conn);
726 rdma_destroy_id(isert_conn->conn_cm_id);
728 ib_dereg_mr(isert_conn->conn_mr);
729 ib_dealloc_pd(isert_conn->conn_pd);
731 if (isert_conn->login_buf) {
732 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
733 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
734 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
735 ISCSI_DEF_MAX_RECV_SEG_LEN,
737 kfree(isert_conn->login_buf);
742 isert_device_try_release(device);
744 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
748 isert_connected_handler(struct rdma_cm_id *cma_id)
750 struct isert_conn *isert_conn = cma_id->context;
752 kref_get(&isert_conn->conn_kref);
756 isert_release_conn_kref(struct kref *kref)
758 struct isert_conn *isert_conn = container_of(kref,
759 struct isert_conn, conn_kref);
761 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
762 current->comm, current->pid);
764 isert_connect_release(isert_conn);
768 isert_put_conn(struct isert_conn *isert_conn)
770 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
774 isert_disconnect_work(struct work_struct *work)
776 struct isert_conn *isert_conn = container_of(work,
777 struct isert_conn, conn_logout_work);
779 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
780 mutex_lock(&isert_conn->conn_mutex);
781 if (isert_conn->state == ISER_CONN_UP)
782 isert_conn->state = ISER_CONN_TERMINATING;
784 if (isert_conn->post_recv_buf_count == 0 &&
785 atomic_read(&isert_conn->post_send_buf_count) == 0) {
786 mutex_unlock(&isert_conn->conn_mutex);
789 if (!isert_conn->conn_cm_id) {
790 mutex_unlock(&isert_conn->conn_mutex);
791 isert_put_conn(isert_conn);
795 if (isert_conn->disconnect) {
796 /* Send DREQ/DREP towards our initiator */
797 rdma_disconnect(isert_conn->conn_cm_id);
800 mutex_unlock(&isert_conn->conn_mutex);
803 complete(&isert_conn->conn_wait);
807 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
809 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
811 isert_conn->disconnect = disconnect;
812 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
813 schedule_work(&isert_conn->conn_logout_work);
817 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
820 bool disconnect = false;
822 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
823 event->event, event->status, cma_id->context, cma_id);
825 switch (event->event) {
826 case RDMA_CM_EVENT_CONNECT_REQUEST:
827 ret = isert_connect_request(cma_id, event);
829 case RDMA_CM_EVENT_ESTABLISHED:
830 isert_connected_handler(cma_id);
832 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
833 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
834 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
836 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
837 isert_disconnected_handler(cma_id, disconnect);
839 case RDMA_CM_EVENT_CONNECT_ERROR:
841 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
846 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
855 isert_post_recv(struct isert_conn *isert_conn, u32 count)
857 struct ib_recv_wr *rx_wr, *rx_wr_failed;
859 unsigned int rx_head = isert_conn->conn_rx_desc_head;
860 struct iser_rx_desc *rx_desc;
862 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
863 rx_desc = &isert_conn->conn_rx_descs[rx_head];
864 rx_wr->wr_id = (unsigned long)rx_desc;
865 rx_wr->sg_list = &rx_desc->rx_sg;
867 rx_wr->next = rx_wr + 1;
868 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
872 rx_wr->next = NULL; /* mark end of work requests list */
874 isert_conn->post_recv_buf_count += count;
875 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
878 pr_err("ib_post_recv() failed with ret: %d\n", ret);
879 isert_conn->post_recv_buf_count -= count;
881 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
882 isert_conn->conn_rx_desc_head = rx_head;
888 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
890 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
891 struct ib_send_wr send_wr, *send_wr_failed;
894 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
895 ISER_HEADERS_LEN, DMA_TO_DEVICE);
898 send_wr.wr_id = (unsigned long)tx_desc;
899 send_wr.sg_list = tx_desc->tx_sg;
900 send_wr.num_sge = tx_desc->num_sge;
901 send_wr.opcode = IB_WR_SEND;
902 send_wr.send_flags = IB_SEND_SIGNALED;
904 atomic_inc(&isert_conn->post_send_buf_count);
906 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
908 pr_err("ib_post_send() failed, ret: %d\n", ret);
909 atomic_dec(&isert_conn->post_send_buf_count);
916 isert_create_send_desc(struct isert_conn *isert_conn,
917 struct isert_cmd *isert_cmd,
918 struct iser_tx_desc *tx_desc)
920 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
922 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
923 ISER_HEADERS_LEN, DMA_TO_DEVICE);
925 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
926 tx_desc->iser_header.flags = ISER_VER;
928 tx_desc->num_sge = 1;
929 tx_desc->isert_cmd = isert_cmd;
931 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
932 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
933 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
938 isert_init_tx_hdrs(struct isert_conn *isert_conn,
939 struct iser_tx_desc *tx_desc)
941 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
944 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
945 ISER_HEADERS_LEN, DMA_TO_DEVICE);
946 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
947 pr_err("ib_dma_mapping_error() failed\n");
951 tx_desc->dma_addr = dma_addr;
952 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
953 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
954 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
956 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
957 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
958 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
964 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
965 struct ib_send_wr *send_wr, bool coalesce)
967 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
969 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
970 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
971 send_wr->opcode = IB_WR_SEND;
972 send_wr->sg_list = &tx_desc->tx_sg[0];
973 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
975 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
976 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
978 mutex_lock(&isert_conn->conn_mutex);
979 if (coalesce && isert_conn->state == ISER_CONN_UP &&
980 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
981 tx_desc->llnode_active = true;
982 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
983 mutex_unlock(&isert_conn->conn_mutex);
986 isert_conn->conn_comp_batch = 0;
987 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
988 mutex_unlock(&isert_conn->conn_mutex);
990 send_wr->send_flags = IB_SEND_SIGNALED;
994 isert_rdma_post_recvl(struct isert_conn *isert_conn)
996 struct ib_recv_wr rx_wr, *rx_wr_fail;
1000 memset(&sge, 0, sizeof(struct ib_sge));
1001 sge.addr = isert_conn->login_req_dma;
1002 sge.length = ISER_RX_LOGIN_SIZE;
1003 sge.lkey = isert_conn->conn_mr->lkey;
1005 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1006 sge.addr, sge.length, sge.lkey);
1008 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1009 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1010 rx_wr.sg_list = &sge;
1013 isert_conn->post_recv_buf_count++;
1014 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1016 pr_err("ib_post_recv() failed: %d\n", ret);
1017 isert_conn->post_recv_buf_count--;
1020 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1025 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1028 struct isert_conn *isert_conn = conn->context;
1029 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1030 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1033 isert_create_send_desc(isert_conn, NULL, tx_desc);
1035 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1036 sizeof(struct iscsi_hdr));
1038 isert_init_tx_hdrs(isert_conn, tx_desc);
1041 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1043 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1044 length, DMA_TO_DEVICE);
1046 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1048 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1049 length, DMA_TO_DEVICE);
1051 tx_dsg->addr = isert_conn->login_rsp_dma;
1052 tx_dsg->length = length;
1053 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1054 tx_desc->num_sge = 2;
1056 if (!login->login_failed) {
1057 if (login->login_complete) {
1058 if (!conn->sess->sess_ops->SessionType &&
1059 isert_conn->conn_device->use_fastreg) {
1060 /* Normal Session and fastreg is used */
1061 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1063 ret = isert_conn_create_fastreg_pool(isert_conn,
1066 pr_err("Conn: %p failed to create"
1067 " fastreg pool\n", isert_conn);
1072 ret = isert_alloc_rx_descriptors(isert_conn);
1076 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1080 isert_conn->state = ISER_CONN_UP;
1084 ret = isert_rdma_post_recvl(isert_conn);
1089 ret = isert_post_send(isert_conn, tx_desc);
1097 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1098 struct isert_conn *isert_conn)
1100 struct iscsi_conn *conn = isert_conn->conn;
1101 struct iscsi_login *login = conn->conn_login;
1105 pr_err("conn->conn_login is NULL\n");
1110 if (login->first_request) {
1111 struct iscsi_login_req *login_req =
1112 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1114 * Setup the initial iscsi_login values from the leading
1115 * login request PDU.
1117 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1118 login->current_stage =
1119 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1121 login->version_min = login_req->min_version;
1122 login->version_max = login_req->max_version;
1123 memcpy(login->isid, login_req->isid, 6);
1124 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1125 login->init_task_tag = login_req->itt;
1126 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1127 login->cid = be16_to_cpu(login_req->cid);
1128 login->tsih = be16_to_cpu(login_req->tsih);
1131 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1133 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1134 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1135 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1136 memcpy(login->req_buf, &rx_desc->data[0], size);
1138 if (login->first_request) {
1139 complete(&isert_conn->conn_login_comp);
1142 schedule_delayed_work(&conn->login_work, 0);
1145 static struct iscsi_cmd
1146 *isert_allocate_cmd(struct iscsi_conn *conn)
1148 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1149 struct isert_cmd *isert_cmd;
1150 struct iscsi_cmd *cmd;
1152 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1154 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1157 isert_cmd = iscsit_priv_cmd(cmd);
1158 isert_cmd->conn = isert_conn;
1159 isert_cmd->iscsi_cmd = cmd;
1165 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1166 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1167 struct iser_rx_desc *rx_desc, unsigned char *buf)
1169 struct iscsi_conn *conn = isert_conn->conn;
1170 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1171 struct scatterlist *sg;
1172 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1173 bool dump_payload = false;
1175 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1179 imm_data = cmd->immediate_data;
1180 imm_data_len = cmd->first_burst_len;
1181 unsol_data = cmd->unsolicited_data;
1183 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1186 } else if (rc > 0) {
1187 dump_payload = true;
1194 sg = &cmd->se_cmd.t_data_sg[0];
1195 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1197 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1198 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1200 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1202 cmd->write_data_done += imm_data_len;
1204 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1205 spin_lock_bh(&cmd->istate_lock);
1206 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1207 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1208 spin_unlock_bh(&cmd->istate_lock);
1212 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1214 if (!rc && dump_payload == false && unsol_data)
1215 iscsit_set_unsoliticed_dataout(cmd);
1216 else if (dump_payload && imm_data)
1217 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1223 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1224 struct iser_rx_desc *rx_desc, unsigned char *buf)
1226 struct scatterlist *sg_start;
1227 struct iscsi_conn *conn = isert_conn->conn;
1228 struct iscsi_cmd *cmd = NULL;
1229 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1230 u32 unsol_data_len = ntoh24(hdr->dlength);
1231 int rc, sg_nents, sg_off, page_off;
1233 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1239 * FIXME: Unexpected unsolicited_data out
1241 if (!cmd->unsolicited_data) {
1242 pr_err("Received unexpected solicited data payload\n");
1247 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1248 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1250 sg_off = cmd->write_data_done / PAGE_SIZE;
1251 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1252 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1253 page_off = cmd->write_data_done % PAGE_SIZE;
1255 * FIXME: Non page-aligned unsolicited_data out
1258 pr_err("Received unexpected non-page aligned data payload\n");
1262 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1263 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1265 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1268 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1276 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1277 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1280 struct iscsi_conn *conn = isert_conn->conn;
1281 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1284 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1288 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1291 return iscsit_process_nop_out(conn, cmd, hdr);
1295 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1296 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1297 struct iscsi_text *hdr)
1299 struct iscsi_conn *conn = isert_conn->conn;
1300 u32 payload_length = ntoh24(hdr->dlength);
1302 unsigned char *text_in;
1304 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1308 text_in = kzalloc(payload_length, GFP_KERNEL);
1310 pr_err("Unable to allocate text_in of payload_length: %u\n",
1314 cmd->text_in_ptr = text_in;
1316 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1318 return iscsit_process_text_cmd(conn, cmd, hdr);
1322 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1323 uint32_t read_stag, uint64_t read_va,
1324 uint32_t write_stag, uint64_t write_va)
1326 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1327 struct iscsi_conn *conn = isert_conn->conn;
1328 struct iscsi_session *sess = conn->sess;
1329 struct iscsi_cmd *cmd;
1330 struct isert_cmd *isert_cmd;
1332 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1334 if (sess->sess_ops->SessionType &&
1335 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1336 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1337 " ignoring\n", opcode);
1342 case ISCSI_OP_SCSI_CMD:
1343 cmd = isert_allocate_cmd(conn);
1347 isert_cmd = iscsit_priv_cmd(cmd);
1348 isert_cmd->read_stag = read_stag;
1349 isert_cmd->read_va = read_va;
1350 isert_cmd->write_stag = write_stag;
1351 isert_cmd->write_va = write_va;
1353 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1354 rx_desc, (unsigned char *)hdr);
1356 case ISCSI_OP_NOOP_OUT:
1357 cmd = isert_allocate_cmd(conn);
1361 isert_cmd = iscsit_priv_cmd(cmd);
1362 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1363 rx_desc, (unsigned char *)hdr);
1365 case ISCSI_OP_SCSI_DATA_OUT:
1366 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1367 (unsigned char *)hdr);
1369 case ISCSI_OP_SCSI_TMFUNC:
1370 cmd = isert_allocate_cmd(conn);
1374 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1375 (unsigned char *)hdr);
1377 case ISCSI_OP_LOGOUT:
1378 cmd = isert_allocate_cmd(conn);
1382 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1384 wait_for_completion_timeout(&conn->conn_logout_comp,
1385 SECONDS_FOR_LOGOUT_COMP *
1389 cmd = isert_allocate_cmd(conn);
1393 isert_cmd = iscsit_priv_cmd(cmd);
1394 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1395 rx_desc, (struct iscsi_text *)hdr);
1398 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1407 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1409 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1410 uint64_t read_va = 0, write_va = 0;
1411 uint32_t read_stag = 0, write_stag = 0;
1414 switch (iser_hdr->flags & 0xF0) {
1416 if (iser_hdr->flags & ISER_RSV) {
1417 read_stag = be32_to_cpu(iser_hdr->read_stag);
1418 read_va = be64_to_cpu(iser_hdr->read_va);
1419 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1420 read_stag, (unsigned long long)read_va);
1422 if (iser_hdr->flags & ISER_WSV) {
1423 write_stag = be32_to_cpu(iser_hdr->write_stag);
1424 write_va = be64_to_cpu(iser_hdr->write_va);
1425 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1426 write_stag, (unsigned long long)write_va);
1429 pr_debug("ISER ISCSI_CTRL PDU\n");
1432 pr_err("iSER Hello message\n");
1435 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1439 rc = isert_rx_opcode(isert_conn, rx_desc,
1440 read_stag, read_va, write_stag, write_va);
1444 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1445 unsigned long xfer_len)
1447 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1448 struct iscsi_hdr *hdr;
1450 int rx_buflen, outstanding;
1452 if ((char *)desc == isert_conn->login_req_buf) {
1453 rx_dma = isert_conn->login_req_dma;
1454 rx_buflen = ISER_RX_LOGIN_SIZE;
1455 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1458 rx_dma = desc->dma_addr;
1459 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1460 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1464 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1466 hdr = &desc->iscsi_header;
1467 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1468 hdr->opcode, hdr->itt, hdr->flags,
1469 (int)(xfer_len - ISER_HEADERS_LEN));
1471 if ((char *)desc == isert_conn->login_req_buf)
1472 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1475 isert_rx_do_work(desc, isert_conn);
1477 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1480 isert_conn->post_recv_buf_count--;
1481 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1482 isert_conn->post_recv_buf_count);
1484 if ((char *)desc == isert_conn->login_req_buf)
1487 outstanding = isert_conn->post_recv_buf_count;
1488 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1489 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1490 ISERT_MIN_POSTED_RX);
1491 err = isert_post_recv(isert_conn, count);
1493 pr_err("isert_post_recv() count: %d failed, %d\n",
1500 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1501 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1502 enum iser_ib_op_code op, struct isert_data_buf *data)
1504 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1506 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1507 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1509 data->len = length - offset;
1510 data->offset = offset;
1511 data->sg_off = data->offset / PAGE_SIZE;
1513 data->sg = &sg[data->sg_off];
1514 data->nents = min_t(unsigned int, nents - data->sg_off,
1515 ISCSI_ISER_SG_TABLESIZE);
1516 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1519 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1521 if (unlikely(!data->dma_nents)) {
1522 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1526 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1527 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1533 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1535 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1537 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1538 memset(data, 0, sizeof(*data));
1544 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1546 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1548 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1551 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1552 isert_unmap_data_buf(isert_conn, &wr->data);
1556 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1562 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1569 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1571 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1572 LIST_HEAD(unmap_list);
1574 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1577 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1578 isert_cmd, wr->fr_desc);
1579 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1580 isert_unmap_data_buf(isert_conn, &wr->prot);
1581 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1583 spin_lock_bh(&isert_conn->conn_lock);
1584 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1585 spin_unlock_bh(&isert_conn->conn_lock);
1590 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1591 isert_unmap_data_buf(isert_conn, &wr->data);
1599 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1601 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1602 struct isert_conn *isert_conn = isert_cmd->conn;
1603 struct iscsi_conn *conn = isert_conn->conn;
1604 struct isert_device *device = isert_conn->conn_device;
1606 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1608 switch (cmd->iscsi_opcode) {
1609 case ISCSI_OP_SCSI_CMD:
1610 spin_lock_bh(&conn->cmd_lock);
1611 if (!list_empty(&cmd->i_conn_node))
1612 list_del_init(&cmd->i_conn_node);
1613 spin_unlock_bh(&conn->cmd_lock);
1615 if (cmd->data_direction == DMA_TO_DEVICE) {
1616 iscsit_stop_dataout_timer(cmd);
1618 * Check for special case during comp_err where
1619 * WRITE_PENDING has been handed off from core,
1620 * but requires an extra target_put_sess_cmd()
1621 * before transport_generic_free_cmd() below.
1624 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1625 struct se_cmd *se_cmd = &cmd->se_cmd;
1627 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1631 device->unreg_rdma_mem(isert_cmd, isert_conn);
1632 transport_generic_free_cmd(&cmd->se_cmd, 0);
1634 case ISCSI_OP_SCSI_TMFUNC:
1635 spin_lock_bh(&conn->cmd_lock);
1636 if (!list_empty(&cmd->i_conn_node))
1637 list_del_init(&cmd->i_conn_node);
1638 spin_unlock_bh(&conn->cmd_lock);
1640 transport_generic_free_cmd(&cmd->se_cmd, 0);
1642 case ISCSI_OP_REJECT:
1643 case ISCSI_OP_NOOP_OUT:
1645 spin_lock_bh(&conn->cmd_lock);
1646 if (!list_empty(&cmd->i_conn_node))
1647 list_del_init(&cmd->i_conn_node);
1648 spin_unlock_bh(&conn->cmd_lock);
1651 * Handle special case for REJECT when iscsi_add_reject*() has
1652 * overwritten the original iscsi_opcode assignment, and the
1653 * associated cmd->se_cmd needs to be released.
1655 if (cmd->se_cmd.se_tfo != NULL) {
1656 pr_debug("Calling transport_generic_free_cmd from"
1657 " isert_put_cmd for 0x%02x\n",
1659 transport_generic_free_cmd(&cmd->se_cmd, 0);
1666 iscsit_release_cmd(cmd);
1672 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1674 if (tx_desc->dma_addr != 0) {
1675 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1676 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1677 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1678 tx_desc->dma_addr = 0;
1683 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1684 struct ib_device *ib_dev, bool comp_err)
1686 if (isert_cmd->pdu_buf_dma != 0) {
1687 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1688 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1689 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1690 isert_cmd->pdu_buf_dma = 0;
1693 isert_unmap_tx_desc(tx_desc, ib_dev);
1694 isert_put_cmd(isert_cmd, comp_err);
1698 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1700 struct ib_mr_status mr_status;
1703 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1705 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1706 goto fail_mr_status;
1709 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1711 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1713 switch (mr_status.sig_err.err_type) {
1714 case IB_SIG_BAD_GUARD:
1715 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1717 case IB_SIG_BAD_REFTAG:
1718 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1720 case IB_SIG_BAD_APPTAG:
1721 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1724 sec_offset_err = mr_status.sig_err.sig_err_offset;
1725 do_div(sec_offset_err, block_size);
1726 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1728 pr_err("isert: PI error found type %d at sector 0x%llx "
1729 "expected 0x%x vs actual 0x%x\n",
1730 mr_status.sig_err.err_type,
1731 (unsigned long long)se_cmd->bad_sector,
1732 mr_status.sig_err.expected,
1733 mr_status.sig_err.actual);
1742 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1743 struct isert_cmd *isert_cmd)
1745 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1746 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1747 struct se_cmd *se_cmd = &cmd->se_cmd;
1748 struct isert_conn *isert_conn = isert_cmd->conn;
1749 struct isert_device *device = isert_conn->conn_device;
1752 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1753 ret = isert_check_pi_status(se_cmd,
1754 wr->fr_desc->pi_ctx->sig_mr);
1755 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1758 device->unreg_rdma_mem(isert_cmd, isert_conn);
1759 wr->send_wr_num = 0;
1761 transport_send_check_condition_and_sense(se_cmd,
1764 isert_put_response(isert_conn->conn, cmd);
1768 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1769 struct isert_cmd *isert_cmd)
1771 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1772 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1773 struct se_cmd *se_cmd = &cmd->se_cmd;
1774 struct isert_conn *isert_conn = isert_cmd->conn;
1775 struct isert_device *device = isert_conn->conn_device;
1778 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1779 ret = isert_check_pi_status(se_cmd,
1780 wr->fr_desc->pi_ctx->sig_mr);
1781 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1784 iscsit_stop_dataout_timer(cmd);
1785 device->unreg_rdma_mem(isert_cmd, isert_conn);
1786 cmd->write_data_done = wr->data.len;
1787 wr->send_wr_num = 0;
1789 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1790 spin_lock_bh(&cmd->istate_lock);
1791 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1792 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1793 spin_unlock_bh(&cmd->istate_lock);
1796 transport_send_check_condition_and_sense(se_cmd,
1799 target_execute_cmd(se_cmd);
1803 isert_do_control_comp(struct work_struct *work)
1805 struct isert_cmd *isert_cmd = container_of(work,
1806 struct isert_cmd, comp_work);
1807 struct isert_conn *isert_conn = isert_cmd->conn;
1808 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1809 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1811 switch (cmd->i_state) {
1812 case ISTATE_SEND_TASKMGTRSP:
1813 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1815 atomic_dec(&isert_conn->post_send_buf_count);
1816 iscsit_tmr_post_handler(cmd, cmd->conn);
1818 cmd->i_state = ISTATE_SENT_STATUS;
1819 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1821 case ISTATE_SEND_REJECT:
1822 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1823 atomic_dec(&isert_conn->post_send_buf_count);
1825 cmd->i_state = ISTATE_SENT_STATUS;
1826 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1828 case ISTATE_SEND_LOGOUTRSP:
1829 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1831 atomic_dec(&isert_conn->post_send_buf_count);
1832 iscsit_logout_post_handler(cmd, cmd->conn);
1834 case ISTATE_SEND_TEXTRSP:
1835 atomic_dec(&isert_conn->post_send_buf_count);
1836 cmd->i_state = ISTATE_SENT_STATUS;
1837 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1840 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1847 isert_response_completion(struct iser_tx_desc *tx_desc,
1848 struct isert_cmd *isert_cmd,
1849 struct isert_conn *isert_conn,
1850 struct ib_device *ib_dev)
1852 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1853 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1855 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1856 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1857 cmd->i_state == ISTATE_SEND_REJECT ||
1858 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1859 isert_unmap_tx_desc(tx_desc, ib_dev);
1861 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1862 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1867 * If send_wr_num is 0 this means that we got
1868 * RDMA completion and we cleared it and we should
1869 * simply decrement the response post. else the
1870 * response is incorporated in send_wr_num, just
1873 if (wr->send_wr_num)
1874 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1876 atomic_dec(&isert_conn->post_send_buf_count);
1878 cmd->i_state = ISTATE_SENT_STATUS;
1879 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1883 __isert_send_completion(struct iser_tx_desc *tx_desc,
1884 struct isert_conn *isert_conn)
1886 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1887 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1888 struct isert_rdma_wr *wr;
1891 atomic_dec(&isert_conn->post_send_buf_count);
1892 isert_unmap_tx_desc(tx_desc, ib_dev);
1895 wr = &isert_cmd->rdma_wr;
1897 switch (wr->iser_ib_op) {
1899 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1903 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1904 isert_response_completion(tx_desc, isert_cmd,
1905 isert_conn, ib_dev);
1907 case ISER_IB_RDMA_WRITE:
1908 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1909 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1910 isert_completion_rdma_write(tx_desc, isert_cmd);
1912 case ISER_IB_RDMA_READ:
1913 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1915 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1916 isert_completion_rdma_read(tx_desc, isert_cmd);
1919 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1926 isert_send_completion(struct iser_tx_desc *tx_desc,
1927 struct isert_conn *isert_conn)
1929 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1930 struct iser_tx_desc *t;
1932 * Drain coalesced completion llist starting from comp_llnode_batch
1933 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1936 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1937 llnode = llist_next(llnode);
1938 __isert_send_completion(t, isert_conn);
1940 __isert_send_completion(tx_desc, isert_conn);
1944 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1946 struct llist_node *llnode;
1947 struct isert_rdma_wr *wr;
1948 struct iser_tx_desc *t;
1950 mutex_lock(&isert_conn->conn_mutex);
1951 llnode = llist_del_all(&isert_conn->conn_comp_llist);
1952 isert_conn->conn_comp_batch = 0;
1953 mutex_unlock(&isert_conn->conn_mutex);
1956 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1957 llnode = llist_next(llnode);
1958 wr = &t->isert_cmd->rdma_wr;
1961 * If send_wr_num is 0 this means that we got
1962 * RDMA completion and we cleared it and we should
1963 * simply decrement the response post. else the
1964 * response is incorporated in send_wr_num, just
1967 if (wr->send_wr_num)
1968 atomic_sub(wr->send_wr_num,
1969 &isert_conn->post_send_buf_count);
1971 atomic_dec(&isert_conn->post_send_buf_count);
1973 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1978 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1980 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1981 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1982 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1983 struct isert_rdma_wr *wr;
1984 struct iser_tx_desc *t;
1987 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1988 llnode = llist_next(llnode);
1989 wr = &t->isert_cmd->rdma_wr;
1992 * If send_wr_num is 0 this means that we got
1993 * RDMA completion and we cleared it and we should
1994 * simply decrement the response post. else the
1995 * response is incorporated in send_wr_num, just
1998 if (wr->send_wr_num)
1999 atomic_sub(wr->send_wr_num,
2000 &isert_conn->post_send_buf_count);
2002 atomic_dec(&isert_conn->post_send_buf_count);
2004 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2006 tx_desc->comp_llnode_batch = NULL;
2009 isert_unmap_tx_desc(tx_desc, ib_dev);
2011 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2015 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2017 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2018 struct iscsi_conn *conn = isert_conn->conn;
2020 if (isert_conn->post_recv_buf_count)
2023 isert_cq_drain_comp_llist(isert_conn, ib_dev);
2026 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2027 target_wait_for_sess_cmds(conn->sess->se_sess);
2030 while (atomic_read(&isert_conn->post_send_buf_count))
2033 mutex_lock(&isert_conn->conn_mutex);
2034 isert_conn->state = ISER_CONN_DOWN;
2035 mutex_unlock(&isert_conn->conn_mutex);
2037 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2039 complete(&isert_conn->conn_wait_comp_err);
2043 isert_cq_tx_work(struct work_struct *work)
2045 struct isert_cq_desc *cq_desc = container_of(work,
2046 struct isert_cq_desc, cq_tx_work);
2047 struct isert_device *device = cq_desc->device;
2048 int cq_index = cq_desc->cq_index;
2049 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2050 struct isert_conn *isert_conn;
2051 struct iser_tx_desc *tx_desc;
2054 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2055 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2056 isert_conn = wc.qp->qp_context;
2058 if (wc.status == IB_WC_SUCCESS) {
2059 isert_send_completion(tx_desc, isert_conn);
2061 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2062 pr_debug("TX wc.status: 0x%08x\n", wc.status);
2063 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2065 if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2066 if (tx_desc->llnode_active)
2069 atomic_dec(&isert_conn->post_send_buf_count);
2070 isert_cq_tx_comp_err(tx_desc, isert_conn);
2075 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2079 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2081 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2083 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2087 isert_cq_rx_work(struct work_struct *work)
2089 struct isert_cq_desc *cq_desc = container_of(work,
2090 struct isert_cq_desc, cq_rx_work);
2091 struct isert_device *device = cq_desc->device;
2092 int cq_index = cq_desc->cq_index;
2093 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2094 struct isert_conn *isert_conn;
2095 struct iser_rx_desc *rx_desc;
2097 unsigned long xfer_len;
2099 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2100 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2101 isert_conn = wc.qp->qp_context;
2103 if (wc.status == IB_WC_SUCCESS) {
2104 xfer_len = (unsigned long)wc.byte_len;
2105 isert_rx_completion(rx_desc, isert_conn, xfer_len);
2107 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2108 if (wc.status != IB_WC_WR_FLUSH_ERR) {
2109 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2110 pr_debug("RX wc.vendor_err: 0x%08x\n",
2113 isert_conn->post_recv_buf_count--;
2114 isert_cq_rx_comp_err(isert_conn);
2118 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2122 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2124 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2126 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2130 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2132 struct ib_send_wr *wr_failed;
2135 atomic_inc(&isert_conn->post_send_buf_count);
2137 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2140 pr_err("ib_post_send failed with %d\n", ret);
2141 atomic_dec(&isert_conn->post_send_buf_count);
2148 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2150 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2151 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2152 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2153 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2154 &isert_cmd->tx_desc.iscsi_header;
2156 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2157 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2158 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2160 * Attach SENSE DATA payload to iSCSI Response PDU
2162 if (cmd->se_cmd.sense_buffer &&
2163 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2164 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2165 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2166 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2167 u32 padding, pdu_len;
2169 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2171 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2173 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2174 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2175 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2177 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2178 (void *)cmd->sense_buffer, pdu_len,
2181 isert_cmd->pdu_buf_len = pdu_len;
2182 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2183 tx_dsg->length = pdu_len;
2184 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2185 isert_cmd->tx_desc.num_sge = 2;
2188 isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2190 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2192 return isert_post_response(isert_conn, isert_cmd);
2196 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2198 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2199 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2200 struct isert_device *device = isert_conn->conn_device;
2202 spin_lock_bh(&conn->cmd_lock);
2203 if (!list_empty(&cmd->i_conn_node))
2204 list_del_init(&cmd->i_conn_node);
2205 spin_unlock_bh(&conn->cmd_lock);
2207 if (cmd->data_direction == DMA_TO_DEVICE)
2208 iscsit_stop_dataout_timer(cmd);
2210 device->unreg_rdma_mem(isert_cmd, isert_conn);
2213 static enum target_prot_op
2214 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2216 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2217 struct isert_device *device = isert_conn->conn_device;
2219 if (device->pi_capable)
2220 return TARGET_PROT_ALL;
2222 return TARGET_PROT_NORMAL;
2226 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2227 bool nopout_response)
2229 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2230 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2231 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2233 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2234 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2235 &isert_cmd->tx_desc.iscsi_header,
2237 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2238 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2240 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2242 return isert_post_response(isert_conn, isert_cmd);
2246 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2248 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2249 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2250 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2252 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2253 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2254 &isert_cmd->tx_desc.iscsi_header);
2255 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2256 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2258 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2260 return isert_post_response(isert_conn, isert_cmd);
2264 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2266 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2267 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2268 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2270 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2271 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2272 &isert_cmd->tx_desc.iscsi_header);
2273 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2274 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2276 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2278 return isert_post_response(isert_conn, isert_cmd);
2282 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2284 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2285 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2286 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2287 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2288 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2289 struct iscsi_reject *hdr =
2290 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2292 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2293 iscsit_build_reject(cmd, conn, hdr);
2294 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2296 hton24(hdr->dlength, ISCSI_HDR_LEN);
2297 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2298 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2300 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2301 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2302 tx_dsg->length = ISCSI_HDR_LEN;
2303 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2304 isert_cmd->tx_desc.num_sge = 2;
2306 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2308 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2310 return isert_post_response(isert_conn, isert_cmd);
2314 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2316 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2317 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2318 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2319 struct iscsi_text_rsp *hdr =
2320 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2324 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2325 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2330 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2333 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2334 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2335 void *txt_rsp_buf = cmd->buf_ptr;
2337 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2338 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2340 isert_cmd->pdu_buf_len = txt_rsp_len;
2341 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2342 tx_dsg->length = txt_rsp_len;
2343 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2344 isert_cmd->tx_desc.num_sge = 2;
2346 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2348 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2350 return isert_post_response(isert_conn, isert_cmd);
2354 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2355 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2356 u32 data_left, u32 offset)
2358 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2359 struct scatterlist *sg_start, *tmp_sg;
2360 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2361 u32 sg_off, page_off;
2362 int i = 0, sg_nents;
2364 sg_off = offset / PAGE_SIZE;
2365 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2366 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2367 page_off = offset % PAGE_SIZE;
2369 send_wr->sg_list = ib_sge;
2370 send_wr->num_sge = sg_nents;
2371 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2373 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2375 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2376 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2377 (unsigned long long)tmp_sg->dma_address,
2378 tmp_sg->length, page_off);
2380 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2381 ib_sge->length = min_t(u32, data_left,
2382 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2383 ib_sge->lkey = isert_conn->conn_mr->lkey;
2385 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2386 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2388 data_left -= ib_sge->length;
2390 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2393 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2394 send_wr->sg_list, send_wr->num_sge);
2400 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2401 struct isert_rdma_wr *wr)
2403 struct se_cmd *se_cmd = &cmd->se_cmd;
2404 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2405 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2406 struct isert_data_buf *data = &wr->data;
2407 struct ib_send_wr *send_wr;
2408 struct ib_sge *ib_sge;
2409 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2410 int ret = 0, i, ib_sge_cnt;
2412 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2414 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2415 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2416 se_cmd->t_data_nents, se_cmd->data_length,
2417 offset, wr->iser_ib_op, &wr->data);
2421 data_left = data->len;
2422 offset = data->offset;
2424 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2426 pr_warn("Unable to allocate ib_sge\n");
2430 wr->ib_sge = ib_sge;
2432 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2433 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2436 pr_debug("Unable to allocate wr->send_wr\n");
2441 wr->isert_cmd = isert_cmd;
2442 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2444 for (i = 0; i < wr->send_wr_num; i++) {
2445 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2446 data_len = min(data_left, rdma_write_max);
2448 send_wr->send_flags = 0;
2449 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2450 send_wr->opcode = IB_WR_RDMA_WRITE;
2451 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2452 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2453 if (i + 1 == wr->send_wr_num)
2454 send_wr->next = &isert_cmd->tx_desc.send_wr;
2456 send_wr->next = &wr->send_wr[i + 1];
2458 send_wr->opcode = IB_WR_RDMA_READ;
2459 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2460 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2461 if (i + 1 == wr->send_wr_num)
2462 send_wr->send_flags = IB_SEND_SIGNALED;
2464 send_wr->next = &wr->send_wr[i + 1];
2467 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2468 send_wr, data_len, offset);
2469 ib_sge += ib_sge_cnt;
2472 va_offset += data_len;
2473 data_left -= data_len;
2478 isert_unmap_data_buf(isert_conn, data);
2484 isert_map_fr_pagelist(struct ib_device *ib_dev,
2485 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2487 u64 start_addr, end_addr, page, chunk_start = 0;
2488 struct scatterlist *tmp_sg;
2489 int i = 0, new_chunk, last_ent, n_pages;
2493 last_ent = sg_nents - 1;
2494 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2495 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2497 chunk_start = start_addr;
2498 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2500 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2501 i, (unsigned long long)tmp_sg->dma_address,
2504 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2510 page = chunk_start & PAGE_MASK;
2512 fr_pl[n_pages++] = page;
2513 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2516 } while (page < end_addr);
2523 isert_fast_reg_mr(struct isert_conn *isert_conn,
2524 struct fast_reg_descriptor *fr_desc,
2525 struct isert_data_buf *mem,
2526 enum isert_indicator ind,
2529 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2531 struct ib_fast_reg_page_list *frpl;
2532 struct ib_send_wr fr_wr, inv_wr;
2533 struct ib_send_wr *bad_wr, *wr = NULL;
2534 int ret, pagelist_len;
2538 if (mem->dma_nents == 1) {
2539 sge->lkey = isert_conn->conn_mr->lkey;
2540 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2541 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2542 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2543 __func__, __LINE__, sge->addr, sge->length,
2548 if (ind == ISERT_DATA_KEY_VALID) {
2549 /* Registering data buffer */
2550 mr = fr_desc->data_mr;
2551 frpl = fr_desc->data_frpl;
2553 /* Registering protection buffer */
2554 mr = fr_desc->pi_ctx->prot_mr;
2555 frpl = fr_desc->pi_ctx->prot_frpl;
2558 page_off = mem->offset % PAGE_SIZE;
2560 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2561 fr_desc, mem->nents, mem->offset);
2563 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2564 &frpl->page_list[0]);
2566 if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2567 memset(&inv_wr, 0, sizeof(inv_wr));
2568 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2569 inv_wr.opcode = IB_WR_LOCAL_INV;
2570 inv_wr.ex.invalidate_rkey = mr->rkey;
2573 key = (u8)(mr->rkey & 0x000000FF);
2574 ib_update_fast_reg_key(mr, ++key);
2577 /* Prepare FASTREG WR */
2578 memset(&fr_wr, 0, sizeof(fr_wr));
2579 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2580 fr_wr.opcode = IB_WR_FAST_REG_MR;
2581 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2582 fr_wr.wr.fast_reg.page_list = frpl;
2583 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2584 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2585 fr_wr.wr.fast_reg.length = mem->len;
2586 fr_wr.wr.fast_reg.rkey = mr->rkey;
2587 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2594 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2596 pr_err("fast registration failed, ret:%d\n", ret);
2599 fr_desc->ind &= ~ind;
2601 sge->lkey = mr->lkey;
2602 sge->addr = frpl->page_list[0] + page_off;
2603 sge->length = mem->len;
2605 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2606 __func__, __LINE__, sge->addr, sge->length,
2612 static inline enum ib_t10_dif_type
2613 se2ib_prot_type(enum target_prot_type prot_type)
2615 switch (prot_type) {
2616 case TARGET_DIF_TYPE0_PROT:
2617 return IB_T10DIF_NONE;
2618 case TARGET_DIF_TYPE1_PROT:
2619 return IB_T10DIF_TYPE1;
2620 case TARGET_DIF_TYPE2_PROT:
2621 return IB_T10DIF_TYPE2;
2622 case TARGET_DIF_TYPE3_PROT:
2623 return IB_T10DIF_TYPE3;
2625 return IB_T10DIF_NONE;
2630 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2632 enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2634 sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2635 sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2636 sig_attrs->mem.sig.dif.pi_interval =
2637 se_cmd->se_dev->dev_attrib.block_size;
2638 sig_attrs->wire.sig.dif.pi_interval =
2639 se_cmd->se_dev->dev_attrib.block_size;
2641 switch (se_cmd->prot_op) {
2642 case TARGET_PROT_DIN_INSERT:
2643 case TARGET_PROT_DOUT_STRIP:
2644 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2645 sig_attrs->wire.sig.dif.type = ib_prot_type;
2646 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2647 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2649 case TARGET_PROT_DOUT_INSERT:
2650 case TARGET_PROT_DIN_STRIP:
2651 sig_attrs->mem.sig.dif.type = ib_prot_type;
2652 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2653 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2654 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2656 case TARGET_PROT_DIN_PASS:
2657 case TARGET_PROT_DOUT_PASS:
2658 sig_attrs->mem.sig.dif.type = ib_prot_type;
2659 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2660 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2661 sig_attrs->wire.sig.dif.type = ib_prot_type;
2662 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2663 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2666 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2674 isert_set_prot_checks(u8 prot_checks)
2676 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2677 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2678 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2682 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2683 struct fast_reg_descriptor *fr_desc,
2684 struct ib_sge *data_sge, struct ib_sge *prot_sge,
2685 struct ib_sge *sig_sge)
2687 struct ib_send_wr sig_wr, inv_wr;
2688 struct ib_send_wr *bad_wr, *wr = NULL;
2689 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2690 struct ib_sig_attrs sig_attrs;
2694 memset(&sig_attrs, 0, sizeof(sig_attrs));
2695 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2699 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2701 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2702 memset(&inv_wr, 0, sizeof(inv_wr));
2703 inv_wr.opcode = IB_WR_LOCAL_INV;
2704 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2705 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2708 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2709 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2712 memset(&sig_wr, 0, sizeof(sig_wr));
2713 sig_wr.opcode = IB_WR_REG_SIG_MR;
2714 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2715 sig_wr.sg_list = data_sge;
2717 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2718 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2719 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2720 if (se_cmd->t_prot_sg)
2721 sig_wr.wr.sig_handover.prot = prot_sge;
2728 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2730 pr_err("fast registration failed, ret:%d\n", ret);
2733 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2735 sig_sge->lkey = pi_ctx->sig_mr->lkey;
2737 sig_sge->length = se_cmd->data_length;
2738 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2739 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2741 * We have protection guards on the wire
2742 * so we need to set a larget transfer
2744 sig_sge->length += se_cmd->prot_length;
2746 pr_debug("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2747 sig_sge->addr, sig_sge->length,
2754 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2755 struct isert_rdma_wr *wr)
2757 struct se_cmd *se_cmd = &cmd->se_cmd;
2758 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2759 struct isert_conn *isert_conn = conn->context;
2760 struct ib_sge data_sge;
2761 struct ib_send_wr *send_wr;
2762 struct fast_reg_descriptor *fr_desc = NULL;
2765 unsigned long flags;
2767 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2769 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2770 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2771 se_cmd->t_data_nents, se_cmd->data_length,
2772 offset, wr->iser_ib_op, &wr->data);
2776 if (wr->data.dma_nents != 1 ||
2777 se_cmd->prot_op != TARGET_PROT_NORMAL) {
2778 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2779 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2780 struct fast_reg_descriptor, list);
2781 list_del(&fr_desc->list);
2782 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2783 wr->fr_desc = fr_desc;
2786 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2787 ISERT_DATA_KEY_VALID, &data_sge);
2791 if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2792 struct ib_sge prot_sge, sig_sge;
2794 if (se_cmd->t_prot_sg) {
2795 ret = isert_map_data_buf(isert_conn, isert_cmd,
2797 se_cmd->t_prot_nents,
2798 se_cmd->prot_length,
2799 0, wr->iser_ib_op, &wr->prot);
2803 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2804 ISERT_PROT_KEY_VALID, &prot_sge);
2806 goto unmap_prot_cmd;
2809 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2810 &data_sge, &prot_sge, &sig_sge);
2812 goto unmap_prot_cmd;
2814 fr_desc->ind |= ISERT_PROTECTED;
2815 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2817 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2819 wr->ib_sge = &wr->s_ib_sge;
2820 wr->send_wr_num = 1;
2821 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2822 wr->send_wr = &wr->s_send_wr;
2823 wr->isert_cmd = isert_cmd;
2825 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2826 send_wr->sg_list = &wr->s_ib_sge;
2827 send_wr->num_sge = 1;
2828 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2829 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2830 send_wr->opcode = IB_WR_RDMA_WRITE;
2831 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2832 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2833 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2834 0 : IB_SEND_SIGNALED;
2836 send_wr->opcode = IB_WR_RDMA_READ;
2837 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2838 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2839 send_wr->send_flags = IB_SEND_SIGNALED;
2844 if (se_cmd->t_prot_sg)
2845 isert_unmap_data_buf(isert_conn, &wr->prot);
2848 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2849 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2850 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2852 isert_unmap_data_buf(isert_conn, &wr->data);
2858 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2860 struct se_cmd *se_cmd = &cmd->se_cmd;
2861 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2862 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2863 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2864 struct isert_device *device = isert_conn->conn_device;
2865 struct ib_send_wr *wr_failed;
2868 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2869 isert_cmd, se_cmd->data_length);
2870 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2871 rc = device->reg_rdma_mem(conn, cmd, wr);
2873 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2877 if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2879 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2881 isert_create_send_desc(isert_conn, isert_cmd,
2882 &isert_cmd->tx_desc);
2883 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2884 &isert_cmd->tx_desc.iscsi_header);
2885 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2886 isert_init_send_wr(isert_conn, isert_cmd,
2887 &isert_cmd->tx_desc.send_wr, true);
2888 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2889 wr->send_wr_num += 1;
2892 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2894 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2896 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2897 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2900 if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2901 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2902 "READ\n", isert_cmd);
2904 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2911 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2913 struct se_cmd *se_cmd = &cmd->se_cmd;
2914 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2915 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2916 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2917 struct isert_device *device = isert_conn->conn_device;
2918 struct ib_send_wr *wr_failed;
2921 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2922 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2923 wr->iser_ib_op = ISER_IB_RDMA_READ;
2924 rc = device->reg_rdma_mem(conn, cmd, wr);
2926 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2930 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2932 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2934 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2935 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2937 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2944 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2949 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2950 ret = isert_put_nopin(cmd, conn, false);
2953 pr_err("Unknown immediate state: 0x%02x\n", state);
2962 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2967 case ISTATE_SEND_LOGOUTRSP:
2968 ret = isert_put_logout_rsp(cmd, conn);
2970 pr_debug("Returning iSER Logout -EAGAIN\n");
2974 case ISTATE_SEND_NOPIN:
2975 ret = isert_put_nopin(cmd, conn, true);
2977 case ISTATE_SEND_TASKMGTRSP:
2978 ret = isert_put_tm_rsp(cmd, conn);
2980 case ISTATE_SEND_REJECT:
2981 ret = isert_put_reject(cmd, conn);
2983 case ISTATE_SEND_TEXTRSP:
2984 ret = isert_put_text_rsp(cmd, conn);
2986 case ISTATE_SEND_STATUS:
2988 * Special case for sending non GOOD SCSI status from TX thread
2989 * context during pre se_cmd excecution failure.
2991 ret = isert_put_response(conn, cmd);
2994 pr_err("Unknown response state: 0x%02x\n", state);
3003 isert_setup_np(struct iscsi_np *np,
3004 struct __kernel_sockaddr_storage *ksockaddr)
3006 struct isert_np *isert_np;
3007 struct rdma_cm_id *isert_lid;
3008 struct sockaddr *sa;
3011 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3013 pr_err("Unable to allocate struct isert_np\n");
3016 sema_init(&isert_np->np_sem, 0);
3017 mutex_init(&isert_np->np_accept_mutex);
3018 INIT_LIST_HEAD(&isert_np->np_accept_list);
3019 init_completion(&isert_np->np_login_comp);
3021 sa = (struct sockaddr *)ksockaddr;
3022 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3024 * Setup the np->np_sockaddr from the passed sockaddr setup
3025 * in iscsi_target_configfs.c code..
3027 memcpy(&np->np_sockaddr, ksockaddr,
3028 sizeof(struct __kernel_sockaddr_storage));
3030 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3032 if (IS_ERR(isert_lid)) {
3033 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3034 PTR_ERR(isert_lid));
3035 ret = PTR_ERR(isert_lid);
3039 ret = rdma_bind_addr(isert_lid, sa);
3041 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3045 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3047 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3051 isert_np->np_cm_id = isert_lid;
3052 np->np_context = isert_np;
3053 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3058 rdma_destroy_id(isert_lid);
3065 isert_rdma_accept(struct isert_conn *isert_conn)
3067 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3068 struct rdma_conn_param cp;
3071 memset(&cp, 0, sizeof(struct rdma_conn_param));
3072 cp.initiator_depth = isert_conn->initiator_depth;
3074 cp.rnr_retry_count = 7;
3076 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3078 ret = rdma_accept(cm_id, &cp);
3080 pr_err("rdma_accept() failed with: %d\n", ret);
3084 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3090 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3092 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3095 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3097 * For login requests after the first PDU, isert_rx_login_req() will
3098 * kick schedule_delayed_work(&conn->login_work) as the packet is
3099 * received, which turns this callback from iscsi_target_do_login_rx()
3102 if (!login->first_request)
3105 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3109 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3114 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3115 struct isert_conn *isert_conn)
3117 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3118 struct rdma_route *cm_route = &cm_id->route;
3119 struct sockaddr_in *sock_in;
3120 struct sockaddr_in6 *sock_in6;
3122 conn->login_family = np->np_sockaddr.ss_family;
3124 if (np->np_sockaddr.ss_family == AF_INET6) {
3125 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3126 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3127 &sock_in6->sin6_addr.in6_u);
3128 conn->login_port = ntohs(sock_in6->sin6_port);
3130 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3131 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3132 &sock_in6->sin6_addr.in6_u);
3133 conn->local_port = ntohs(sock_in6->sin6_port);
3135 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3136 sprintf(conn->login_ip, "%pI4",
3137 &sock_in->sin_addr.s_addr);
3138 conn->login_port = ntohs(sock_in->sin_port);
3140 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3141 sprintf(conn->local_ip, "%pI4",
3142 &sock_in->sin_addr.s_addr);
3143 conn->local_port = ntohs(sock_in->sin_port);
3148 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3150 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3151 struct isert_conn *isert_conn;
3152 int max_accept = 0, ret;
3155 ret = down_interruptible(&isert_np->np_sem);
3159 spin_lock_bh(&np->np_thread_lock);
3160 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3161 spin_unlock_bh(&np->np_thread_lock);
3162 pr_debug("np_thread_state %d for isert_accept_np\n",
3163 np->np_thread_state);
3165 * No point in stalling here when np_thread
3166 * is in state RESET/SHUTDOWN/EXIT - bail
3170 spin_unlock_bh(&np->np_thread_lock);
3172 mutex_lock(&isert_np->np_accept_mutex);
3173 if (list_empty(&isert_np->np_accept_list)) {
3174 mutex_unlock(&isert_np->np_accept_mutex);
3178 isert_conn = list_first_entry(&isert_np->np_accept_list,
3179 struct isert_conn, conn_accept_node);
3180 list_del_init(&isert_conn->conn_accept_node);
3181 mutex_unlock(&isert_np->np_accept_mutex);
3183 conn->context = isert_conn;
3184 isert_conn->conn = conn;
3187 ret = isert_rdma_post_recvl(isert_conn);
3191 ret = isert_rdma_accept(isert_conn);
3195 isert_set_conn_info(np, conn, isert_conn);
3197 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3202 isert_free_np(struct iscsi_np *np)
3204 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3206 rdma_destroy_id(isert_np->np_cm_id);
3208 np->np_context = NULL;
3212 static void isert_wait_conn(struct iscsi_conn *conn)
3214 struct isert_conn *isert_conn = conn->context;
3216 pr_debug("isert_wait_conn: Starting \n");
3218 mutex_lock(&isert_conn->conn_mutex);
3219 if (isert_conn->conn_cm_id && !isert_conn->disconnect) {
3220 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3221 rdma_disconnect(isert_conn->conn_cm_id);
3224 * Only wait for conn_wait_comp_err if the isert_conn made it
3225 * into full feature phase..
3227 if (isert_conn->state == ISER_CONN_INIT) {
3228 mutex_unlock(&isert_conn->conn_mutex);
3231 if (isert_conn->state == ISER_CONN_UP)
3232 isert_conn->state = ISER_CONN_TERMINATING;
3233 mutex_unlock(&isert_conn->conn_mutex);
3235 wait_for_completion(&isert_conn->conn_wait_comp_err);
3237 wait_for_completion(&isert_conn->conn_wait);
3238 isert_put_conn(isert_conn);
3241 static void isert_free_conn(struct iscsi_conn *conn)
3243 struct isert_conn *isert_conn = conn->context;
3245 isert_put_conn(isert_conn);
3248 static struct iscsit_transport iser_target_transport = {
3250 .transport_type = ISCSI_INFINIBAND,
3251 .priv_size = sizeof(struct isert_cmd),
3252 .owner = THIS_MODULE,
3253 .iscsit_setup_np = isert_setup_np,
3254 .iscsit_accept_np = isert_accept_np,
3255 .iscsit_free_np = isert_free_np,
3256 .iscsit_wait_conn = isert_wait_conn,
3257 .iscsit_free_conn = isert_free_conn,
3258 .iscsit_get_login_rx = isert_get_login_rx,
3259 .iscsit_put_login_tx = isert_put_login_tx,
3260 .iscsit_immediate_queue = isert_immediate_queue,
3261 .iscsit_response_queue = isert_response_queue,
3262 .iscsit_get_dataout = isert_get_dataout,
3263 .iscsit_queue_data_in = isert_put_datain,
3264 .iscsit_queue_status = isert_put_response,
3265 .iscsit_aborted_task = isert_aborted_task,
3266 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3269 static int __init isert_init(void)
3273 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3275 pr_err("Unable to allocate isert_rx_wq\n");
3279 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3280 if (!isert_comp_wq) {
3281 pr_err("Unable to allocate isert_comp_wq\n");
3286 iscsit_register_transport(&iser_target_transport);
3287 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3291 destroy_workqueue(isert_rx_wq);
3295 static void __exit isert_exit(void)
3297 flush_scheduled_work();
3298 destroy_workqueue(isert_comp_wq);
3299 destroy_workqueue(isert_rx_wq);
3300 iscsit_unregister_transport(&iser_target_transport);
3301 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3304 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3305 MODULE_VERSION("0.1");
3306 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3307 MODULE_LICENSE("GPL");
3309 module_init(isert_init);
3310 module_exit(isert_exit);