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Merge tag 'samsung-fixes-v3.18' of git://git.kernel.org/pub/scm/linux/kernel/git...
[deliverable/linux.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
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.
12 *
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 ****************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
23 #include <linux/in.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>
32
33 #include "isert_proto.h"
34 #include "ib_isert.h"
35
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)
39
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;
44
45 static void
46 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
47 static int
48 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
49 struct isert_rdma_wr *wr);
50 static void
51 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
52 static int
53 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
54 struct isert_rdma_wr *wr);
55 static int
56 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
57
58 static void
59 isert_qp_event_callback(struct ib_event *e, void *context)
60 {
61 struct isert_conn *isert_conn = (struct isert_conn *)context;
62
63 pr_err("isert_qp_event_callback event: %d\n", e->event);
64 switch (e->event) {
65 case IB_EVENT_COMM_EST:
66 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
67 break;
68 case IB_EVENT_QP_LAST_WQE_REACHED:
69 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
70 break;
71 default:
72 break;
73 }
74 }
75
76 static int
77 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
78 {
79 int ret;
80
81 ret = ib_query_device(ib_dev, devattr);
82 if (ret) {
83 pr_err("ib_query_device() failed: %d\n", ret);
84 return ret;
85 }
86 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
87 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
88
89 return 0;
90 }
91
92 static int
93 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
94 u8 protection)
95 {
96 struct isert_device *device = isert_conn->conn_device;
97 struct ib_qp_init_attr attr;
98 int ret, index, min_index = 0;
99
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])
104 min_index = 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);
108
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;
116 /*
117 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
118 * work-around for RDMA_READs with ConnectX-2.
119 *
120 * Also, still make sure to have at least two SGEs for
121 * outgoing control PDU responses.
122 */
123 attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
124 isert_conn->max_sge = attr.cap.max_send_sge;
125
126 attr.cap.max_recv_sge = 1;
127 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
128 attr.qp_type = IB_QPT_RC;
129 if (protection)
130 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
131
132 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
133 cma_id->device);
134 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
135 isert_conn->conn_pd->device);
136
137 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
138 if (ret) {
139 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
140 return ret;
141 }
142 isert_conn->conn_qp = cma_id->qp;
143 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
144
145 return 0;
146 }
147
148 static void
149 isert_cq_event_callback(struct ib_event *e, void *context)
150 {
151 pr_debug("isert_cq_event_callback event: %d\n", e->event);
152 }
153
154 static int
155 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
156 {
157 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
158 struct iser_rx_desc *rx_desc;
159 struct ib_sge *rx_sg;
160 u64 dma_addr;
161 int i, j;
162
163 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
164 sizeof(struct iser_rx_desc), GFP_KERNEL);
165 if (!isert_conn->conn_rx_descs)
166 goto fail;
167
168 rx_desc = isert_conn->conn_rx_descs;
169
170 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
171 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
172 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
173 if (ib_dma_mapping_error(ib_dev, dma_addr))
174 goto dma_map_fail;
175
176 rx_desc->dma_addr = dma_addr;
177
178 rx_sg = &rx_desc->rx_sg;
179 rx_sg->addr = rx_desc->dma_addr;
180 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
181 rx_sg->lkey = isert_conn->conn_mr->lkey;
182 }
183
184 isert_conn->conn_rx_desc_head = 0;
185 return 0;
186
187 dma_map_fail:
188 rx_desc = isert_conn->conn_rx_descs;
189 for (j = 0; j < i; j++, rx_desc++) {
190 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
191 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
192 }
193 kfree(isert_conn->conn_rx_descs);
194 isert_conn->conn_rx_descs = NULL;
195 fail:
196 return -ENOMEM;
197 }
198
199 static void
200 isert_free_rx_descriptors(struct isert_conn *isert_conn)
201 {
202 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
203 struct iser_rx_desc *rx_desc;
204 int i;
205
206 if (!isert_conn->conn_rx_descs)
207 return;
208
209 rx_desc = isert_conn->conn_rx_descs;
210 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
211 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
212 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
213 }
214
215 kfree(isert_conn->conn_rx_descs);
216 isert_conn->conn_rx_descs = NULL;
217 }
218
219 static void isert_cq_tx_work(struct work_struct *);
220 static void isert_cq_tx_callback(struct ib_cq *, void *);
221 static void isert_cq_rx_work(struct work_struct *);
222 static void isert_cq_rx_callback(struct ib_cq *, void *);
223
224 static int
225 isert_create_device_ib_res(struct isert_device *device)
226 {
227 struct ib_device *ib_dev = device->ib_device;
228 struct isert_cq_desc *cq_desc;
229 struct ib_device_attr *dev_attr;
230 int ret = 0, i, j;
231 int max_rx_cqe, max_tx_cqe;
232
233 dev_attr = &device->dev_attr;
234 ret = isert_query_device(ib_dev, dev_attr);
235 if (ret)
236 return ret;
237
238 max_rx_cqe = min(ISER_MAX_RX_CQ_LEN, dev_attr->max_cqe);
239 max_tx_cqe = min(ISER_MAX_TX_CQ_LEN, dev_attr->max_cqe);
240
241 /* asign function handlers */
242 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
243 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
244 device->use_fastreg = 1;
245 device->reg_rdma_mem = isert_reg_rdma;
246 device->unreg_rdma_mem = isert_unreg_rdma;
247 } else {
248 device->use_fastreg = 0;
249 device->reg_rdma_mem = isert_map_rdma;
250 device->unreg_rdma_mem = isert_unmap_cmd;
251 }
252
253 /* Check signature cap */
254 device->pi_capable = dev_attr->device_cap_flags &
255 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
256
257 device->cqs_used = min_t(int, num_online_cpus(),
258 device->ib_device->num_comp_vectors);
259 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
260 pr_debug("Using %d CQs, device %s supports %d vectors support "
261 "Fast registration %d pi_capable %d\n",
262 device->cqs_used, device->ib_device->name,
263 device->ib_device->num_comp_vectors, device->use_fastreg,
264 device->pi_capable);
265 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
266 device->cqs_used, GFP_KERNEL);
267 if (!device->cq_desc) {
268 pr_err("Unable to allocate device->cq_desc\n");
269 return -ENOMEM;
270 }
271 cq_desc = device->cq_desc;
272
273 for (i = 0; i < device->cqs_used; i++) {
274 cq_desc[i].device = device;
275 cq_desc[i].cq_index = i;
276
277 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
278 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
279 isert_cq_rx_callback,
280 isert_cq_event_callback,
281 (void *)&cq_desc[i],
282 max_rx_cqe, i);
283 if (IS_ERR(device->dev_rx_cq[i])) {
284 ret = PTR_ERR(device->dev_rx_cq[i]);
285 device->dev_rx_cq[i] = NULL;
286 goto out_cq;
287 }
288
289 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
290 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
291 isert_cq_tx_callback,
292 isert_cq_event_callback,
293 (void *)&cq_desc[i],
294 max_tx_cqe, i);
295 if (IS_ERR(device->dev_tx_cq[i])) {
296 ret = PTR_ERR(device->dev_tx_cq[i]);
297 device->dev_tx_cq[i] = NULL;
298 goto out_cq;
299 }
300
301 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
302 if (ret)
303 goto out_cq;
304
305 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
306 if (ret)
307 goto out_cq;
308 }
309
310 return 0;
311
312 out_cq:
313 for (j = 0; j < i; j++) {
314 cq_desc = &device->cq_desc[j];
315
316 if (device->dev_rx_cq[j]) {
317 cancel_work_sync(&cq_desc->cq_rx_work);
318 ib_destroy_cq(device->dev_rx_cq[j]);
319 }
320 if (device->dev_tx_cq[j]) {
321 cancel_work_sync(&cq_desc->cq_tx_work);
322 ib_destroy_cq(device->dev_tx_cq[j]);
323 }
324 }
325 kfree(device->cq_desc);
326
327 return ret;
328 }
329
330 static void
331 isert_free_device_ib_res(struct isert_device *device)
332 {
333 struct isert_cq_desc *cq_desc;
334 int i;
335
336 for (i = 0; i < device->cqs_used; i++) {
337 cq_desc = &device->cq_desc[i];
338
339 cancel_work_sync(&cq_desc->cq_rx_work);
340 cancel_work_sync(&cq_desc->cq_tx_work);
341 ib_destroy_cq(device->dev_rx_cq[i]);
342 ib_destroy_cq(device->dev_tx_cq[i]);
343 device->dev_rx_cq[i] = NULL;
344 device->dev_tx_cq[i] = NULL;
345 }
346
347 kfree(device->cq_desc);
348 }
349
350 static void
351 isert_device_try_release(struct isert_device *device)
352 {
353 mutex_lock(&device_list_mutex);
354 device->refcount--;
355 if (!device->refcount) {
356 isert_free_device_ib_res(device);
357 list_del(&device->dev_node);
358 kfree(device);
359 }
360 mutex_unlock(&device_list_mutex);
361 }
362
363 static struct isert_device *
364 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
365 {
366 struct isert_device *device;
367 int ret;
368
369 mutex_lock(&device_list_mutex);
370 list_for_each_entry(device, &device_list, dev_node) {
371 if (device->ib_device->node_guid == cma_id->device->node_guid) {
372 device->refcount++;
373 mutex_unlock(&device_list_mutex);
374 return device;
375 }
376 }
377
378 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
379 if (!device) {
380 mutex_unlock(&device_list_mutex);
381 return ERR_PTR(-ENOMEM);
382 }
383
384 INIT_LIST_HEAD(&device->dev_node);
385
386 device->ib_device = cma_id->device;
387 ret = isert_create_device_ib_res(device);
388 if (ret) {
389 kfree(device);
390 mutex_unlock(&device_list_mutex);
391 return ERR_PTR(ret);
392 }
393
394 device->refcount++;
395 list_add_tail(&device->dev_node, &device_list);
396 mutex_unlock(&device_list_mutex);
397
398 return device;
399 }
400
401 static void
402 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
403 {
404 struct fast_reg_descriptor *fr_desc, *tmp;
405 int i = 0;
406
407 if (list_empty(&isert_conn->conn_fr_pool))
408 return;
409
410 pr_debug("Freeing conn %p fastreg pool", isert_conn);
411
412 list_for_each_entry_safe(fr_desc, tmp,
413 &isert_conn->conn_fr_pool, list) {
414 list_del(&fr_desc->list);
415 ib_free_fast_reg_page_list(fr_desc->data_frpl);
416 ib_dereg_mr(fr_desc->data_mr);
417 if (fr_desc->pi_ctx) {
418 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
419 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
420 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
421 kfree(fr_desc->pi_ctx);
422 }
423 kfree(fr_desc);
424 ++i;
425 }
426
427 if (i < isert_conn->conn_fr_pool_size)
428 pr_warn("Pool still has %d regions registered\n",
429 isert_conn->conn_fr_pool_size - i);
430 }
431
432 static int
433 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
434 struct fast_reg_descriptor *fr_desc, u8 protection)
435 {
436 int ret;
437
438 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
439 ISCSI_ISER_SG_TABLESIZE);
440 if (IS_ERR(fr_desc->data_frpl)) {
441 pr_err("Failed to allocate data frpl err=%ld\n",
442 PTR_ERR(fr_desc->data_frpl));
443 return PTR_ERR(fr_desc->data_frpl);
444 }
445
446 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
447 if (IS_ERR(fr_desc->data_mr)) {
448 pr_err("Failed to allocate data frmr err=%ld\n",
449 PTR_ERR(fr_desc->data_mr));
450 ret = PTR_ERR(fr_desc->data_mr);
451 goto err_data_frpl;
452 }
453 pr_debug("Create fr_desc %p page_list %p\n",
454 fr_desc, fr_desc->data_frpl->page_list);
455 fr_desc->ind |= ISERT_DATA_KEY_VALID;
456
457 if (protection) {
458 struct ib_mr_init_attr mr_init_attr = {0};
459 struct pi_context *pi_ctx;
460
461 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
462 if (!fr_desc->pi_ctx) {
463 pr_err("Failed to allocate pi context\n");
464 ret = -ENOMEM;
465 goto err_data_mr;
466 }
467 pi_ctx = fr_desc->pi_ctx;
468
469 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
470 ISCSI_ISER_SG_TABLESIZE);
471 if (IS_ERR(pi_ctx->prot_frpl)) {
472 pr_err("Failed to allocate prot frpl err=%ld\n",
473 PTR_ERR(pi_ctx->prot_frpl));
474 ret = PTR_ERR(pi_ctx->prot_frpl);
475 goto err_pi_ctx;
476 }
477
478 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
479 if (IS_ERR(pi_ctx->prot_mr)) {
480 pr_err("Failed to allocate prot frmr err=%ld\n",
481 PTR_ERR(pi_ctx->prot_mr));
482 ret = PTR_ERR(pi_ctx->prot_mr);
483 goto err_prot_frpl;
484 }
485 fr_desc->ind |= ISERT_PROT_KEY_VALID;
486
487 mr_init_attr.max_reg_descriptors = 2;
488 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
489 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
490 if (IS_ERR(pi_ctx->sig_mr)) {
491 pr_err("Failed to allocate signature enabled mr err=%ld\n",
492 PTR_ERR(pi_ctx->sig_mr));
493 ret = PTR_ERR(pi_ctx->sig_mr);
494 goto err_prot_mr;
495 }
496 fr_desc->ind |= ISERT_SIG_KEY_VALID;
497 }
498 fr_desc->ind &= ~ISERT_PROTECTED;
499
500 return 0;
501 err_prot_mr:
502 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
503 err_prot_frpl:
504 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
505 err_pi_ctx:
506 kfree(fr_desc->pi_ctx);
507 err_data_mr:
508 ib_dereg_mr(fr_desc->data_mr);
509 err_data_frpl:
510 ib_free_fast_reg_page_list(fr_desc->data_frpl);
511
512 return ret;
513 }
514
515 static int
516 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
517 {
518 struct fast_reg_descriptor *fr_desc;
519 struct isert_device *device = isert_conn->conn_device;
520 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
521 struct se_node_acl *se_nacl = se_sess->se_node_acl;
522 int i, ret, tag_num;
523 /*
524 * Setup the number of FRMRs based upon the number of tags
525 * available to session in iscsi_target_locate_portal().
526 */
527 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
528 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
529
530 isert_conn->conn_fr_pool_size = 0;
531 for (i = 0; i < tag_num; i++) {
532 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
533 if (!fr_desc) {
534 pr_err("Failed to allocate fast_reg descriptor\n");
535 ret = -ENOMEM;
536 goto err;
537 }
538
539 ret = isert_create_fr_desc(device->ib_device,
540 isert_conn->conn_pd, fr_desc,
541 pi_support);
542 if (ret) {
543 pr_err("Failed to create fastreg descriptor err=%d\n",
544 ret);
545 kfree(fr_desc);
546 goto err;
547 }
548
549 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
550 isert_conn->conn_fr_pool_size++;
551 }
552
553 pr_debug("Creating conn %p fastreg pool size=%d",
554 isert_conn, isert_conn->conn_fr_pool_size);
555
556 return 0;
557
558 err:
559 isert_conn_free_fastreg_pool(isert_conn);
560 return ret;
561 }
562
563 static int
564 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
565 {
566 struct iscsi_np *np = cma_id->context;
567 struct isert_np *isert_np = np->np_context;
568 struct isert_conn *isert_conn;
569 struct isert_device *device;
570 struct ib_device *ib_dev = cma_id->device;
571 int ret = 0;
572 u8 pi_support;
573
574 spin_lock_bh(&np->np_thread_lock);
575 if (!np->enabled) {
576 spin_unlock_bh(&np->np_thread_lock);
577 pr_debug("iscsi_np is not enabled, reject connect request\n");
578 return rdma_reject(cma_id, NULL, 0);
579 }
580 spin_unlock_bh(&np->np_thread_lock);
581
582 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
583 cma_id, cma_id->context);
584
585 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
586 if (!isert_conn) {
587 pr_err("Unable to allocate isert_conn\n");
588 return -ENOMEM;
589 }
590 isert_conn->state = ISER_CONN_INIT;
591 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
592 init_completion(&isert_conn->conn_login_comp);
593 init_completion(&isert_conn->conn_wait);
594 init_completion(&isert_conn->conn_wait_comp_err);
595 kref_init(&isert_conn->conn_kref);
596 mutex_init(&isert_conn->conn_mutex);
597 spin_lock_init(&isert_conn->conn_lock);
598 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
599
600 cma_id->context = isert_conn;
601 isert_conn->conn_cm_id = cma_id;
602
603 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
604 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
605 if (!isert_conn->login_buf) {
606 pr_err("Unable to allocate isert_conn->login_buf\n");
607 ret = -ENOMEM;
608 goto out;
609 }
610
611 isert_conn->login_req_buf = isert_conn->login_buf;
612 isert_conn->login_rsp_buf = isert_conn->login_buf +
613 ISCSI_DEF_MAX_RECV_SEG_LEN;
614 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
615 isert_conn->login_buf, isert_conn->login_req_buf,
616 isert_conn->login_rsp_buf);
617
618 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
619 (void *)isert_conn->login_req_buf,
620 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
621
622 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
623 if (ret) {
624 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
625 ret);
626 isert_conn->login_req_dma = 0;
627 goto out_login_buf;
628 }
629
630 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
631 (void *)isert_conn->login_rsp_buf,
632 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
633
634 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
635 if (ret) {
636 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
637 ret);
638 isert_conn->login_rsp_dma = 0;
639 goto out_req_dma_map;
640 }
641
642 device = isert_device_find_by_ib_dev(cma_id);
643 if (IS_ERR(device)) {
644 ret = PTR_ERR(device);
645 goto out_rsp_dma_map;
646 }
647
648 /* Set max inflight RDMA READ requests */
649 isert_conn->initiator_depth = min_t(u8,
650 event->param.conn.initiator_depth,
651 device->dev_attr.max_qp_init_rd_atom);
652 pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
653
654 isert_conn->conn_device = device;
655 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
656 if (IS_ERR(isert_conn->conn_pd)) {
657 ret = PTR_ERR(isert_conn->conn_pd);
658 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
659 isert_conn, ret);
660 goto out_pd;
661 }
662
663 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
664 IB_ACCESS_LOCAL_WRITE);
665 if (IS_ERR(isert_conn->conn_mr)) {
666 ret = PTR_ERR(isert_conn->conn_mr);
667 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
668 isert_conn, ret);
669 goto out_mr;
670 }
671
672 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
673 if (pi_support && !device->pi_capable) {
674 pr_err("Protection information requested but not supported, "
675 "rejecting connect request\n");
676 ret = rdma_reject(cma_id, NULL, 0);
677 goto out_mr;
678 }
679
680 ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
681 if (ret)
682 goto out_conn_dev;
683
684 mutex_lock(&isert_np->np_accept_mutex);
685 list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
686 mutex_unlock(&isert_np->np_accept_mutex);
687
688 pr_debug("isert_connect_request() up np_sem np: %p\n", np);
689 up(&isert_np->np_sem);
690 return 0;
691
692 out_conn_dev:
693 ib_dereg_mr(isert_conn->conn_mr);
694 out_mr:
695 ib_dealloc_pd(isert_conn->conn_pd);
696 out_pd:
697 isert_device_try_release(device);
698 out_rsp_dma_map:
699 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
700 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
701 out_req_dma_map:
702 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
703 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
704 out_login_buf:
705 kfree(isert_conn->login_buf);
706 out:
707 kfree(isert_conn);
708 return ret;
709 }
710
711 static void
712 isert_connect_release(struct isert_conn *isert_conn)
713 {
714 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
715 struct isert_device *device = isert_conn->conn_device;
716 int cq_index;
717
718 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
719
720 if (device && device->use_fastreg)
721 isert_conn_free_fastreg_pool(isert_conn);
722
723 if (isert_conn->conn_qp) {
724 cq_index = ((struct isert_cq_desc *)
725 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
726 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
727 isert_conn->conn_device->cq_active_qps[cq_index]--;
728
729 rdma_destroy_qp(isert_conn->conn_cm_id);
730 }
731
732 isert_free_rx_descriptors(isert_conn);
733 rdma_destroy_id(isert_conn->conn_cm_id);
734
735 ib_dereg_mr(isert_conn->conn_mr);
736 ib_dealloc_pd(isert_conn->conn_pd);
737
738 if (isert_conn->login_buf) {
739 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
740 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
741 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
742 ISCSI_DEF_MAX_RECV_SEG_LEN,
743 DMA_FROM_DEVICE);
744 kfree(isert_conn->login_buf);
745 }
746 kfree(isert_conn);
747
748 if (device)
749 isert_device_try_release(device);
750
751 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
752 }
753
754 static void
755 isert_connected_handler(struct rdma_cm_id *cma_id)
756 {
757 struct isert_conn *isert_conn = cma_id->context;
758
759 kref_get(&isert_conn->conn_kref);
760 }
761
762 static void
763 isert_release_conn_kref(struct kref *kref)
764 {
765 struct isert_conn *isert_conn = container_of(kref,
766 struct isert_conn, conn_kref);
767
768 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
769 current->comm, current->pid);
770
771 isert_connect_release(isert_conn);
772 }
773
774 static void
775 isert_put_conn(struct isert_conn *isert_conn)
776 {
777 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
778 }
779
780 static void
781 isert_disconnect_work(struct work_struct *work)
782 {
783 struct isert_conn *isert_conn = container_of(work,
784 struct isert_conn, conn_logout_work);
785
786 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
787 mutex_lock(&isert_conn->conn_mutex);
788 if (isert_conn->state == ISER_CONN_UP)
789 isert_conn->state = ISER_CONN_TERMINATING;
790
791 if (isert_conn->post_recv_buf_count == 0 &&
792 atomic_read(&isert_conn->post_send_buf_count) == 0) {
793 mutex_unlock(&isert_conn->conn_mutex);
794 goto wake_up;
795 }
796 if (!isert_conn->conn_cm_id) {
797 mutex_unlock(&isert_conn->conn_mutex);
798 isert_put_conn(isert_conn);
799 return;
800 }
801
802 if (isert_conn->disconnect) {
803 /* Send DREQ/DREP towards our initiator */
804 rdma_disconnect(isert_conn->conn_cm_id);
805 }
806
807 mutex_unlock(&isert_conn->conn_mutex);
808
809 wake_up:
810 complete(&isert_conn->conn_wait);
811 }
812
813 static int
814 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
815 {
816 struct isert_conn *isert_conn;
817
818 if (!cma_id->qp) {
819 struct isert_np *isert_np = cma_id->context;
820
821 isert_np->np_cm_id = NULL;
822 return -1;
823 }
824
825 isert_conn = (struct isert_conn *)cma_id->context;
826
827 isert_conn->disconnect = disconnect;
828 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
829 schedule_work(&isert_conn->conn_logout_work);
830
831 return 0;
832 }
833
834 static int
835 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
836 {
837 int ret = 0;
838 bool disconnect = false;
839
840 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
841 event->event, event->status, cma_id->context, cma_id);
842
843 switch (event->event) {
844 case RDMA_CM_EVENT_CONNECT_REQUEST:
845 ret = isert_connect_request(cma_id, event);
846 if (ret)
847 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
848 event->event, ret);
849 break;
850 case RDMA_CM_EVENT_ESTABLISHED:
851 isert_connected_handler(cma_id);
852 break;
853 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
854 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
855 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
856 disconnect = true;
857 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
858 ret = isert_disconnected_handler(cma_id, disconnect);
859 break;
860 case RDMA_CM_EVENT_CONNECT_ERROR:
861 default:
862 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
863 break;
864 }
865
866 return ret;
867 }
868
869 static int
870 isert_post_recv(struct isert_conn *isert_conn, u32 count)
871 {
872 struct ib_recv_wr *rx_wr, *rx_wr_failed;
873 int i, ret;
874 unsigned int rx_head = isert_conn->conn_rx_desc_head;
875 struct iser_rx_desc *rx_desc;
876
877 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
878 rx_desc = &isert_conn->conn_rx_descs[rx_head];
879 rx_wr->wr_id = (unsigned long)rx_desc;
880 rx_wr->sg_list = &rx_desc->rx_sg;
881 rx_wr->num_sge = 1;
882 rx_wr->next = rx_wr + 1;
883 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
884 }
885
886 rx_wr--;
887 rx_wr->next = NULL; /* mark end of work requests list */
888
889 isert_conn->post_recv_buf_count += count;
890 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
891 &rx_wr_failed);
892 if (ret) {
893 pr_err("ib_post_recv() failed with ret: %d\n", ret);
894 isert_conn->post_recv_buf_count -= count;
895 } else {
896 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
897 isert_conn->conn_rx_desc_head = rx_head;
898 }
899 return ret;
900 }
901
902 static int
903 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
904 {
905 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
906 struct ib_send_wr send_wr, *send_wr_failed;
907 int ret;
908
909 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
910 ISER_HEADERS_LEN, DMA_TO_DEVICE);
911
912 send_wr.next = NULL;
913 send_wr.wr_id = (unsigned long)tx_desc;
914 send_wr.sg_list = tx_desc->tx_sg;
915 send_wr.num_sge = tx_desc->num_sge;
916 send_wr.opcode = IB_WR_SEND;
917 send_wr.send_flags = IB_SEND_SIGNALED;
918
919 atomic_inc(&isert_conn->post_send_buf_count);
920
921 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
922 if (ret) {
923 pr_err("ib_post_send() failed, ret: %d\n", ret);
924 atomic_dec(&isert_conn->post_send_buf_count);
925 }
926
927 return ret;
928 }
929
930 static void
931 isert_create_send_desc(struct isert_conn *isert_conn,
932 struct isert_cmd *isert_cmd,
933 struct iser_tx_desc *tx_desc)
934 {
935 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
936
937 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
938 ISER_HEADERS_LEN, DMA_TO_DEVICE);
939
940 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
941 tx_desc->iser_header.flags = ISER_VER;
942
943 tx_desc->num_sge = 1;
944 tx_desc->isert_cmd = isert_cmd;
945
946 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
947 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
948 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
949 }
950 }
951
952 static int
953 isert_init_tx_hdrs(struct isert_conn *isert_conn,
954 struct iser_tx_desc *tx_desc)
955 {
956 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
957 u64 dma_addr;
958
959 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
960 ISER_HEADERS_LEN, DMA_TO_DEVICE);
961 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
962 pr_err("ib_dma_mapping_error() failed\n");
963 return -ENOMEM;
964 }
965
966 tx_desc->dma_addr = dma_addr;
967 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
968 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
969 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
970
971 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
972 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
973 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
974
975 return 0;
976 }
977
978 static void
979 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
980 struct ib_send_wr *send_wr, bool coalesce)
981 {
982 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
983
984 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
985 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
986 send_wr->opcode = IB_WR_SEND;
987 send_wr->sg_list = &tx_desc->tx_sg[0];
988 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
989 /*
990 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
991 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
992 */
993 mutex_lock(&isert_conn->conn_mutex);
994 if (coalesce && isert_conn->state == ISER_CONN_UP &&
995 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
996 tx_desc->llnode_active = true;
997 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
998 mutex_unlock(&isert_conn->conn_mutex);
999 return;
1000 }
1001 isert_conn->conn_comp_batch = 0;
1002 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
1003 mutex_unlock(&isert_conn->conn_mutex);
1004
1005 send_wr->send_flags = IB_SEND_SIGNALED;
1006 }
1007
1008 static int
1009 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1010 {
1011 struct ib_recv_wr rx_wr, *rx_wr_fail;
1012 struct ib_sge sge;
1013 int ret;
1014
1015 memset(&sge, 0, sizeof(struct ib_sge));
1016 sge.addr = isert_conn->login_req_dma;
1017 sge.length = ISER_RX_LOGIN_SIZE;
1018 sge.lkey = isert_conn->conn_mr->lkey;
1019
1020 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1021 sge.addr, sge.length, sge.lkey);
1022
1023 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1024 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1025 rx_wr.sg_list = &sge;
1026 rx_wr.num_sge = 1;
1027
1028 isert_conn->post_recv_buf_count++;
1029 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1030 if (ret) {
1031 pr_err("ib_post_recv() failed: %d\n", ret);
1032 isert_conn->post_recv_buf_count--;
1033 }
1034
1035 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1036 return ret;
1037 }
1038
1039 static int
1040 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1041 u32 length)
1042 {
1043 struct isert_conn *isert_conn = conn->context;
1044 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1045 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1046 int ret;
1047
1048 isert_create_send_desc(isert_conn, NULL, tx_desc);
1049
1050 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1051 sizeof(struct iscsi_hdr));
1052
1053 isert_init_tx_hdrs(isert_conn, tx_desc);
1054
1055 if (length > 0) {
1056 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1057
1058 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1059 length, DMA_TO_DEVICE);
1060
1061 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1062
1063 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1064 length, DMA_TO_DEVICE);
1065
1066 tx_dsg->addr = isert_conn->login_rsp_dma;
1067 tx_dsg->length = length;
1068 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1069 tx_desc->num_sge = 2;
1070 }
1071 if (!login->login_failed) {
1072 if (login->login_complete) {
1073 if (!conn->sess->sess_ops->SessionType &&
1074 isert_conn->conn_device->use_fastreg) {
1075 /* Normal Session and fastreg is used */
1076 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1077
1078 ret = isert_conn_create_fastreg_pool(isert_conn,
1079 pi_support);
1080 if (ret) {
1081 pr_err("Conn: %p failed to create"
1082 " fastreg pool\n", isert_conn);
1083 return ret;
1084 }
1085 }
1086
1087 ret = isert_alloc_rx_descriptors(isert_conn);
1088 if (ret)
1089 return ret;
1090
1091 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1092 if (ret)
1093 return ret;
1094
1095 isert_conn->state = ISER_CONN_UP;
1096 goto post_send;
1097 }
1098
1099 ret = isert_rdma_post_recvl(isert_conn);
1100 if (ret)
1101 return ret;
1102 }
1103 post_send:
1104 ret = isert_post_send(isert_conn, tx_desc);
1105 if (ret)
1106 return ret;
1107
1108 return 0;
1109 }
1110
1111 static void
1112 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1113 struct isert_conn *isert_conn)
1114 {
1115 struct iscsi_conn *conn = isert_conn->conn;
1116 struct iscsi_login *login = conn->conn_login;
1117 int size;
1118
1119 if (!login) {
1120 pr_err("conn->conn_login is NULL\n");
1121 dump_stack();
1122 return;
1123 }
1124
1125 if (login->first_request) {
1126 struct iscsi_login_req *login_req =
1127 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1128 /*
1129 * Setup the initial iscsi_login values from the leading
1130 * login request PDU.
1131 */
1132 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1133 login->current_stage =
1134 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1135 >> 2;
1136 login->version_min = login_req->min_version;
1137 login->version_max = login_req->max_version;
1138 memcpy(login->isid, login_req->isid, 6);
1139 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1140 login->init_task_tag = login_req->itt;
1141 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1142 login->cid = be16_to_cpu(login_req->cid);
1143 login->tsih = be16_to_cpu(login_req->tsih);
1144 }
1145
1146 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1147
1148 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1149 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1150 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1151 memcpy(login->req_buf, &rx_desc->data[0], size);
1152
1153 if (login->first_request) {
1154 complete(&isert_conn->conn_login_comp);
1155 return;
1156 }
1157 schedule_delayed_work(&conn->login_work, 0);
1158 }
1159
1160 static struct iscsi_cmd
1161 *isert_allocate_cmd(struct iscsi_conn *conn)
1162 {
1163 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1164 struct isert_cmd *isert_cmd;
1165 struct iscsi_cmd *cmd;
1166
1167 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1168 if (!cmd) {
1169 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1170 return NULL;
1171 }
1172 isert_cmd = iscsit_priv_cmd(cmd);
1173 isert_cmd->conn = isert_conn;
1174 isert_cmd->iscsi_cmd = cmd;
1175
1176 return cmd;
1177 }
1178
1179 static int
1180 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1181 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1182 struct iser_rx_desc *rx_desc, unsigned char *buf)
1183 {
1184 struct iscsi_conn *conn = isert_conn->conn;
1185 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1186 struct scatterlist *sg;
1187 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1188 bool dump_payload = false;
1189
1190 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1191 if (rc < 0)
1192 return rc;
1193
1194 imm_data = cmd->immediate_data;
1195 imm_data_len = cmd->first_burst_len;
1196 unsol_data = cmd->unsolicited_data;
1197
1198 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1199 if (rc < 0) {
1200 return 0;
1201 } else if (rc > 0) {
1202 dump_payload = true;
1203 goto sequence_cmd;
1204 }
1205
1206 if (!imm_data)
1207 return 0;
1208
1209 sg = &cmd->se_cmd.t_data_sg[0];
1210 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1211
1212 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1213 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1214
1215 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1216
1217 cmd->write_data_done += imm_data_len;
1218
1219 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1220 spin_lock_bh(&cmd->istate_lock);
1221 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1222 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1223 spin_unlock_bh(&cmd->istate_lock);
1224 }
1225
1226 sequence_cmd:
1227 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1228
1229 if (!rc && dump_payload == false && unsol_data)
1230 iscsit_set_unsoliticed_dataout(cmd);
1231 else if (dump_payload && imm_data)
1232 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1233
1234 return 0;
1235 }
1236
1237 static int
1238 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1239 struct iser_rx_desc *rx_desc, unsigned char *buf)
1240 {
1241 struct scatterlist *sg_start;
1242 struct iscsi_conn *conn = isert_conn->conn;
1243 struct iscsi_cmd *cmd = NULL;
1244 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1245 u32 unsol_data_len = ntoh24(hdr->dlength);
1246 int rc, sg_nents, sg_off, page_off;
1247
1248 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1249 if (rc < 0)
1250 return rc;
1251 else if (!cmd)
1252 return 0;
1253 /*
1254 * FIXME: Unexpected unsolicited_data out
1255 */
1256 if (!cmd->unsolicited_data) {
1257 pr_err("Received unexpected solicited data payload\n");
1258 dump_stack();
1259 return -1;
1260 }
1261
1262 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1263 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1264
1265 sg_off = cmd->write_data_done / PAGE_SIZE;
1266 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1267 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1268 page_off = cmd->write_data_done % PAGE_SIZE;
1269 /*
1270 * FIXME: Non page-aligned unsolicited_data out
1271 */
1272 if (page_off) {
1273 pr_err("Received unexpected non-page aligned data payload\n");
1274 dump_stack();
1275 return -1;
1276 }
1277 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1278 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1279
1280 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1281 unsol_data_len);
1282
1283 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1284 if (rc < 0)
1285 return rc;
1286
1287 return 0;
1288 }
1289
1290 static int
1291 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1292 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1293 unsigned char *buf)
1294 {
1295 struct iscsi_conn *conn = isert_conn->conn;
1296 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1297 int rc;
1298
1299 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1300 if (rc < 0)
1301 return rc;
1302 /*
1303 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1304 */
1305
1306 return iscsit_process_nop_out(conn, cmd, hdr);
1307 }
1308
1309 static int
1310 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1311 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1312 struct iscsi_text *hdr)
1313 {
1314 struct iscsi_conn *conn = isert_conn->conn;
1315 u32 payload_length = ntoh24(hdr->dlength);
1316 int rc;
1317 unsigned char *text_in;
1318
1319 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1320 if (rc < 0)
1321 return rc;
1322
1323 text_in = kzalloc(payload_length, GFP_KERNEL);
1324 if (!text_in) {
1325 pr_err("Unable to allocate text_in of payload_length: %u\n",
1326 payload_length);
1327 return -ENOMEM;
1328 }
1329 cmd->text_in_ptr = text_in;
1330
1331 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1332
1333 return iscsit_process_text_cmd(conn, cmd, hdr);
1334 }
1335
1336 static int
1337 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1338 uint32_t read_stag, uint64_t read_va,
1339 uint32_t write_stag, uint64_t write_va)
1340 {
1341 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1342 struct iscsi_conn *conn = isert_conn->conn;
1343 struct iscsi_session *sess = conn->sess;
1344 struct iscsi_cmd *cmd;
1345 struct isert_cmd *isert_cmd;
1346 int ret = -EINVAL;
1347 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1348
1349 if (sess->sess_ops->SessionType &&
1350 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1351 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1352 " ignoring\n", opcode);
1353 return 0;
1354 }
1355
1356 switch (opcode) {
1357 case ISCSI_OP_SCSI_CMD:
1358 cmd = isert_allocate_cmd(conn);
1359 if (!cmd)
1360 break;
1361
1362 isert_cmd = iscsit_priv_cmd(cmd);
1363 isert_cmd->read_stag = read_stag;
1364 isert_cmd->read_va = read_va;
1365 isert_cmd->write_stag = write_stag;
1366 isert_cmd->write_va = write_va;
1367
1368 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1369 rx_desc, (unsigned char *)hdr);
1370 break;
1371 case ISCSI_OP_NOOP_OUT:
1372 cmd = isert_allocate_cmd(conn);
1373 if (!cmd)
1374 break;
1375
1376 isert_cmd = iscsit_priv_cmd(cmd);
1377 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1378 rx_desc, (unsigned char *)hdr);
1379 break;
1380 case ISCSI_OP_SCSI_DATA_OUT:
1381 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1382 (unsigned char *)hdr);
1383 break;
1384 case ISCSI_OP_SCSI_TMFUNC:
1385 cmd = isert_allocate_cmd(conn);
1386 if (!cmd)
1387 break;
1388
1389 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1390 (unsigned char *)hdr);
1391 break;
1392 case ISCSI_OP_LOGOUT:
1393 cmd = isert_allocate_cmd(conn);
1394 if (!cmd)
1395 break;
1396
1397 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1398 if (ret > 0)
1399 wait_for_completion_timeout(&conn->conn_logout_comp,
1400 SECONDS_FOR_LOGOUT_COMP *
1401 HZ);
1402 break;
1403 case ISCSI_OP_TEXT:
1404 cmd = isert_allocate_cmd(conn);
1405 if (!cmd)
1406 break;
1407
1408 isert_cmd = iscsit_priv_cmd(cmd);
1409 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1410 rx_desc, (struct iscsi_text *)hdr);
1411 break;
1412 default:
1413 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1414 dump_stack();
1415 break;
1416 }
1417
1418 return ret;
1419 }
1420
1421 static void
1422 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1423 {
1424 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1425 uint64_t read_va = 0, write_va = 0;
1426 uint32_t read_stag = 0, write_stag = 0;
1427 int rc;
1428
1429 switch (iser_hdr->flags & 0xF0) {
1430 case ISCSI_CTRL:
1431 if (iser_hdr->flags & ISER_RSV) {
1432 read_stag = be32_to_cpu(iser_hdr->read_stag);
1433 read_va = be64_to_cpu(iser_hdr->read_va);
1434 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1435 read_stag, (unsigned long long)read_va);
1436 }
1437 if (iser_hdr->flags & ISER_WSV) {
1438 write_stag = be32_to_cpu(iser_hdr->write_stag);
1439 write_va = be64_to_cpu(iser_hdr->write_va);
1440 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1441 write_stag, (unsigned long long)write_va);
1442 }
1443
1444 pr_debug("ISER ISCSI_CTRL PDU\n");
1445 break;
1446 case ISER_HELLO:
1447 pr_err("iSER Hello message\n");
1448 break;
1449 default:
1450 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1451 break;
1452 }
1453
1454 rc = isert_rx_opcode(isert_conn, rx_desc,
1455 read_stag, read_va, write_stag, write_va);
1456 }
1457
1458 static void
1459 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1460 unsigned long xfer_len)
1461 {
1462 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1463 struct iscsi_hdr *hdr;
1464 u64 rx_dma;
1465 int rx_buflen, outstanding;
1466
1467 if ((char *)desc == isert_conn->login_req_buf) {
1468 rx_dma = isert_conn->login_req_dma;
1469 rx_buflen = ISER_RX_LOGIN_SIZE;
1470 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1471 rx_dma, rx_buflen);
1472 } else {
1473 rx_dma = desc->dma_addr;
1474 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1475 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1476 rx_dma, rx_buflen);
1477 }
1478
1479 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1480
1481 hdr = &desc->iscsi_header;
1482 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1483 hdr->opcode, hdr->itt, hdr->flags,
1484 (int)(xfer_len - ISER_HEADERS_LEN));
1485
1486 if ((char *)desc == isert_conn->login_req_buf)
1487 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1488 isert_conn);
1489 else
1490 isert_rx_do_work(desc, isert_conn);
1491
1492 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1493 DMA_FROM_DEVICE);
1494
1495 isert_conn->post_recv_buf_count--;
1496 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1497 isert_conn->post_recv_buf_count);
1498
1499 if ((char *)desc == isert_conn->login_req_buf)
1500 return;
1501
1502 outstanding = isert_conn->post_recv_buf_count;
1503 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1504 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1505 ISERT_MIN_POSTED_RX);
1506 err = isert_post_recv(isert_conn, count);
1507 if (err) {
1508 pr_err("isert_post_recv() count: %d failed, %d\n",
1509 count, err);
1510 }
1511 }
1512 }
1513
1514 static int
1515 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1516 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1517 enum iser_ib_op_code op, struct isert_data_buf *data)
1518 {
1519 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1520
1521 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1522 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1523
1524 data->len = length - offset;
1525 data->offset = offset;
1526 data->sg_off = data->offset / PAGE_SIZE;
1527
1528 data->sg = &sg[data->sg_off];
1529 data->nents = min_t(unsigned int, nents - data->sg_off,
1530 ISCSI_ISER_SG_TABLESIZE);
1531 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1532 PAGE_SIZE);
1533
1534 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1535 data->dma_dir);
1536 if (unlikely(!data->dma_nents)) {
1537 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1538 return -EINVAL;
1539 }
1540
1541 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1542 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1543
1544 return 0;
1545 }
1546
1547 static void
1548 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1549 {
1550 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1551
1552 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1553 memset(data, 0, sizeof(*data));
1554 }
1555
1556
1557
1558 static void
1559 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1560 {
1561 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1562
1563 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1564
1565 if (wr->data.sg) {
1566 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1567 isert_unmap_data_buf(isert_conn, &wr->data);
1568 }
1569
1570 if (wr->send_wr) {
1571 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1572 kfree(wr->send_wr);
1573 wr->send_wr = NULL;
1574 }
1575
1576 if (wr->ib_sge) {
1577 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1578 kfree(wr->ib_sge);
1579 wr->ib_sge = NULL;
1580 }
1581 }
1582
1583 static void
1584 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1585 {
1586 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1587 LIST_HEAD(unmap_list);
1588
1589 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1590
1591 if (wr->fr_desc) {
1592 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1593 isert_cmd, wr->fr_desc);
1594 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1595 isert_unmap_data_buf(isert_conn, &wr->prot);
1596 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1597 }
1598 spin_lock_bh(&isert_conn->conn_lock);
1599 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1600 spin_unlock_bh(&isert_conn->conn_lock);
1601 wr->fr_desc = NULL;
1602 }
1603
1604 if (wr->data.sg) {
1605 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1606 isert_unmap_data_buf(isert_conn, &wr->data);
1607 }
1608
1609 wr->ib_sge = NULL;
1610 wr->send_wr = NULL;
1611 }
1612
1613 static void
1614 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1615 {
1616 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1617 struct isert_conn *isert_conn = isert_cmd->conn;
1618 struct iscsi_conn *conn = isert_conn->conn;
1619 struct isert_device *device = isert_conn->conn_device;
1620
1621 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1622
1623 switch (cmd->iscsi_opcode) {
1624 case ISCSI_OP_SCSI_CMD:
1625 spin_lock_bh(&conn->cmd_lock);
1626 if (!list_empty(&cmd->i_conn_node))
1627 list_del_init(&cmd->i_conn_node);
1628 spin_unlock_bh(&conn->cmd_lock);
1629
1630 if (cmd->data_direction == DMA_TO_DEVICE) {
1631 iscsit_stop_dataout_timer(cmd);
1632 /*
1633 * Check for special case during comp_err where
1634 * WRITE_PENDING has been handed off from core,
1635 * but requires an extra target_put_sess_cmd()
1636 * before transport_generic_free_cmd() below.
1637 */
1638 if (comp_err &&
1639 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1640 struct se_cmd *se_cmd = &cmd->se_cmd;
1641
1642 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1643 }
1644 }
1645
1646 device->unreg_rdma_mem(isert_cmd, isert_conn);
1647 transport_generic_free_cmd(&cmd->se_cmd, 0);
1648 break;
1649 case ISCSI_OP_SCSI_TMFUNC:
1650 spin_lock_bh(&conn->cmd_lock);
1651 if (!list_empty(&cmd->i_conn_node))
1652 list_del_init(&cmd->i_conn_node);
1653 spin_unlock_bh(&conn->cmd_lock);
1654
1655 transport_generic_free_cmd(&cmd->se_cmd, 0);
1656 break;
1657 case ISCSI_OP_REJECT:
1658 case ISCSI_OP_NOOP_OUT:
1659 case ISCSI_OP_TEXT:
1660 spin_lock_bh(&conn->cmd_lock);
1661 if (!list_empty(&cmd->i_conn_node))
1662 list_del_init(&cmd->i_conn_node);
1663 spin_unlock_bh(&conn->cmd_lock);
1664
1665 /*
1666 * Handle special case for REJECT when iscsi_add_reject*() has
1667 * overwritten the original iscsi_opcode assignment, and the
1668 * associated cmd->se_cmd needs to be released.
1669 */
1670 if (cmd->se_cmd.se_tfo != NULL) {
1671 pr_debug("Calling transport_generic_free_cmd from"
1672 " isert_put_cmd for 0x%02x\n",
1673 cmd->iscsi_opcode);
1674 transport_generic_free_cmd(&cmd->se_cmd, 0);
1675 break;
1676 }
1677 /*
1678 * Fall-through
1679 */
1680 default:
1681 iscsit_release_cmd(cmd);
1682 break;
1683 }
1684 }
1685
1686 static void
1687 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1688 {
1689 if (tx_desc->dma_addr != 0) {
1690 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1691 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1692 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1693 tx_desc->dma_addr = 0;
1694 }
1695 }
1696
1697 static void
1698 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1699 struct ib_device *ib_dev, bool comp_err)
1700 {
1701 if (isert_cmd->pdu_buf_dma != 0) {
1702 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1703 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1704 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1705 isert_cmd->pdu_buf_dma = 0;
1706 }
1707
1708 isert_unmap_tx_desc(tx_desc, ib_dev);
1709 isert_put_cmd(isert_cmd, comp_err);
1710 }
1711
1712 static int
1713 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1714 {
1715 struct ib_mr_status mr_status;
1716 int ret;
1717
1718 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1719 if (ret) {
1720 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1721 goto fail_mr_status;
1722 }
1723
1724 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1725 u64 sec_offset_err;
1726 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1727
1728 switch (mr_status.sig_err.err_type) {
1729 case IB_SIG_BAD_GUARD:
1730 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1731 break;
1732 case IB_SIG_BAD_REFTAG:
1733 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1734 break;
1735 case IB_SIG_BAD_APPTAG:
1736 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1737 break;
1738 }
1739 sec_offset_err = mr_status.sig_err.sig_err_offset;
1740 do_div(sec_offset_err, block_size);
1741 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1742
1743 pr_err("isert: PI error found type %d at sector 0x%llx "
1744 "expected 0x%x vs actual 0x%x\n",
1745 mr_status.sig_err.err_type,
1746 (unsigned long long)se_cmd->bad_sector,
1747 mr_status.sig_err.expected,
1748 mr_status.sig_err.actual);
1749 ret = 1;
1750 }
1751
1752 fail_mr_status:
1753 return ret;
1754 }
1755
1756 static void
1757 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1758 struct isert_cmd *isert_cmd)
1759 {
1760 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1761 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1762 struct se_cmd *se_cmd = &cmd->se_cmd;
1763 struct isert_conn *isert_conn = isert_cmd->conn;
1764 struct isert_device *device = isert_conn->conn_device;
1765 int ret = 0;
1766
1767 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1768 ret = isert_check_pi_status(se_cmd,
1769 wr->fr_desc->pi_ctx->sig_mr);
1770 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1771 }
1772
1773 device->unreg_rdma_mem(isert_cmd, isert_conn);
1774 wr->send_wr_num = 0;
1775 if (ret)
1776 transport_send_check_condition_and_sense(se_cmd,
1777 se_cmd->pi_err, 0);
1778 else
1779 isert_put_response(isert_conn->conn, cmd);
1780 }
1781
1782 static void
1783 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1784 struct isert_cmd *isert_cmd)
1785 {
1786 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1787 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1788 struct se_cmd *se_cmd = &cmd->se_cmd;
1789 struct isert_conn *isert_conn = isert_cmd->conn;
1790 struct isert_device *device = isert_conn->conn_device;
1791 int ret = 0;
1792
1793 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1794 ret = isert_check_pi_status(se_cmd,
1795 wr->fr_desc->pi_ctx->sig_mr);
1796 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1797 }
1798
1799 iscsit_stop_dataout_timer(cmd);
1800 device->unreg_rdma_mem(isert_cmd, isert_conn);
1801 cmd->write_data_done = wr->data.len;
1802 wr->send_wr_num = 0;
1803
1804 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1805 spin_lock_bh(&cmd->istate_lock);
1806 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1807 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1808 spin_unlock_bh(&cmd->istate_lock);
1809
1810 if (ret)
1811 transport_send_check_condition_and_sense(se_cmd,
1812 se_cmd->pi_err, 0);
1813 else
1814 target_execute_cmd(se_cmd);
1815 }
1816
1817 static void
1818 isert_do_control_comp(struct work_struct *work)
1819 {
1820 struct isert_cmd *isert_cmd = container_of(work,
1821 struct isert_cmd, comp_work);
1822 struct isert_conn *isert_conn = isert_cmd->conn;
1823 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1824 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1825
1826 switch (cmd->i_state) {
1827 case ISTATE_SEND_TASKMGTRSP:
1828 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1829
1830 atomic_dec(&isert_conn->post_send_buf_count);
1831 iscsit_tmr_post_handler(cmd, cmd->conn);
1832
1833 cmd->i_state = ISTATE_SENT_STATUS;
1834 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1835 break;
1836 case ISTATE_SEND_REJECT:
1837 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1838 atomic_dec(&isert_conn->post_send_buf_count);
1839
1840 cmd->i_state = ISTATE_SENT_STATUS;
1841 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1842 break;
1843 case ISTATE_SEND_LOGOUTRSP:
1844 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1845
1846 atomic_dec(&isert_conn->post_send_buf_count);
1847 iscsit_logout_post_handler(cmd, cmd->conn);
1848 break;
1849 case ISTATE_SEND_TEXTRSP:
1850 atomic_dec(&isert_conn->post_send_buf_count);
1851 cmd->i_state = ISTATE_SENT_STATUS;
1852 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1853 break;
1854 default:
1855 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1856 dump_stack();
1857 break;
1858 }
1859 }
1860
1861 static void
1862 isert_response_completion(struct iser_tx_desc *tx_desc,
1863 struct isert_cmd *isert_cmd,
1864 struct isert_conn *isert_conn,
1865 struct ib_device *ib_dev)
1866 {
1867 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1868 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1869
1870 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1871 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1872 cmd->i_state == ISTATE_SEND_REJECT ||
1873 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1874 isert_unmap_tx_desc(tx_desc, ib_dev);
1875
1876 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1877 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1878 return;
1879 }
1880
1881 /**
1882 * If send_wr_num is 0 this means that we got
1883 * RDMA completion and we cleared it and we should
1884 * simply decrement the response post. else the
1885 * response is incorporated in send_wr_num, just
1886 * sub it.
1887 **/
1888 if (wr->send_wr_num)
1889 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1890 else
1891 atomic_dec(&isert_conn->post_send_buf_count);
1892
1893 cmd->i_state = ISTATE_SENT_STATUS;
1894 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1895 }
1896
1897 static void
1898 __isert_send_completion(struct iser_tx_desc *tx_desc,
1899 struct isert_conn *isert_conn)
1900 {
1901 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1902 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1903 struct isert_rdma_wr *wr;
1904
1905 if (!isert_cmd) {
1906 atomic_dec(&isert_conn->post_send_buf_count);
1907 isert_unmap_tx_desc(tx_desc, ib_dev);
1908 return;
1909 }
1910 wr = &isert_cmd->rdma_wr;
1911
1912 switch (wr->iser_ib_op) {
1913 case ISER_IB_RECV:
1914 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1915 dump_stack();
1916 break;
1917 case ISER_IB_SEND:
1918 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1919 isert_response_completion(tx_desc, isert_cmd,
1920 isert_conn, ib_dev);
1921 break;
1922 case ISER_IB_RDMA_WRITE:
1923 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1924 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1925 isert_completion_rdma_write(tx_desc, isert_cmd);
1926 break;
1927 case ISER_IB_RDMA_READ:
1928 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1929
1930 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1931 isert_completion_rdma_read(tx_desc, isert_cmd);
1932 break;
1933 default:
1934 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1935 dump_stack();
1936 break;
1937 }
1938 }
1939
1940 static void
1941 isert_send_completion(struct iser_tx_desc *tx_desc,
1942 struct isert_conn *isert_conn)
1943 {
1944 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1945 struct iser_tx_desc *t;
1946 /*
1947 * Drain coalesced completion llist starting from comp_llnode_batch
1948 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1949 */
1950 while (llnode) {
1951 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1952 llnode = llist_next(llnode);
1953 __isert_send_completion(t, isert_conn);
1954 }
1955 __isert_send_completion(tx_desc, isert_conn);
1956 }
1957
1958 static void
1959 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1960 {
1961 struct llist_node *llnode;
1962 struct isert_rdma_wr *wr;
1963 struct iser_tx_desc *t;
1964
1965 mutex_lock(&isert_conn->conn_mutex);
1966 llnode = llist_del_all(&isert_conn->conn_comp_llist);
1967 isert_conn->conn_comp_batch = 0;
1968 mutex_unlock(&isert_conn->conn_mutex);
1969
1970 while (llnode) {
1971 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1972 llnode = llist_next(llnode);
1973 wr = &t->isert_cmd->rdma_wr;
1974
1975 /**
1976 * If send_wr_num is 0 this means that we got
1977 * RDMA completion and we cleared it and we should
1978 * simply decrement the response post. else the
1979 * response is incorporated in send_wr_num, just
1980 * sub it.
1981 **/
1982 if (wr->send_wr_num)
1983 atomic_sub(wr->send_wr_num,
1984 &isert_conn->post_send_buf_count);
1985 else
1986 atomic_dec(&isert_conn->post_send_buf_count);
1987
1988 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1989 }
1990 }
1991
1992 static void
1993 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1994 {
1995 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1996 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1997 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1998 struct isert_rdma_wr *wr;
1999 struct iser_tx_desc *t;
2000
2001 while (llnode) {
2002 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
2003 llnode = llist_next(llnode);
2004 wr = &t->isert_cmd->rdma_wr;
2005
2006 /**
2007 * If send_wr_num is 0 this means that we got
2008 * RDMA completion and we cleared it and we should
2009 * simply decrement the response post. else the
2010 * response is incorporated in send_wr_num, just
2011 * sub it.
2012 **/
2013 if (wr->send_wr_num)
2014 atomic_sub(wr->send_wr_num,
2015 &isert_conn->post_send_buf_count);
2016 else
2017 atomic_dec(&isert_conn->post_send_buf_count);
2018
2019 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2020 }
2021 tx_desc->comp_llnode_batch = NULL;
2022
2023 if (!isert_cmd)
2024 isert_unmap_tx_desc(tx_desc, ib_dev);
2025 else
2026 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2027 }
2028
2029 static void
2030 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2031 {
2032 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2033 struct iscsi_conn *conn = isert_conn->conn;
2034
2035 if (isert_conn->post_recv_buf_count)
2036 return;
2037
2038 isert_cq_drain_comp_llist(isert_conn, ib_dev);
2039
2040 if (conn->sess) {
2041 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2042 target_wait_for_sess_cmds(conn->sess->se_sess);
2043 }
2044
2045 while (atomic_read(&isert_conn->post_send_buf_count))
2046 msleep(3000);
2047
2048 mutex_lock(&isert_conn->conn_mutex);
2049 isert_conn->state = ISER_CONN_DOWN;
2050 mutex_unlock(&isert_conn->conn_mutex);
2051
2052 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2053
2054 complete(&isert_conn->conn_wait_comp_err);
2055 }
2056
2057 static void
2058 isert_cq_tx_work(struct work_struct *work)
2059 {
2060 struct isert_cq_desc *cq_desc = container_of(work,
2061 struct isert_cq_desc, cq_tx_work);
2062 struct isert_device *device = cq_desc->device;
2063 int cq_index = cq_desc->cq_index;
2064 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2065 struct isert_conn *isert_conn;
2066 struct iser_tx_desc *tx_desc;
2067 struct ib_wc wc;
2068
2069 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2070 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2071 isert_conn = wc.qp->qp_context;
2072
2073 if (wc.status == IB_WC_SUCCESS) {
2074 isert_send_completion(tx_desc, isert_conn);
2075 } else {
2076 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2077 pr_debug("TX wc.status: 0x%08x\n", wc.status);
2078 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2079
2080 if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2081 if (tx_desc->llnode_active)
2082 continue;
2083
2084 atomic_dec(&isert_conn->post_send_buf_count);
2085 isert_cq_tx_comp_err(tx_desc, isert_conn);
2086 }
2087 }
2088 }
2089
2090 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2091 }
2092
2093 static void
2094 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2095 {
2096 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2097
2098 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2099 }
2100
2101 static void
2102 isert_cq_rx_work(struct work_struct *work)
2103 {
2104 struct isert_cq_desc *cq_desc = container_of(work,
2105 struct isert_cq_desc, cq_rx_work);
2106 struct isert_device *device = cq_desc->device;
2107 int cq_index = cq_desc->cq_index;
2108 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2109 struct isert_conn *isert_conn;
2110 struct iser_rx_desc *rx_desc;
2111 struct ib_wc wc;
2112 unsigned long xfer_len;
2113
2114 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2115 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2116 isert_conn = wc.qp->qp_context;
2117
2118 if (wc.status == IB_WC_SUCCESS) {
2119 xfer_len = (unsigned long)wc.byte_len;
2120 isert_rx_completion(rx_desc, isert_conn, xfer_len);
2121 } else {
2122 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2123 if (wc.status != IB_WC_WR_FLUSH_ERR) {
2124 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2125 pr_debug("RX wc.vendor_err: 0x%08x\n",
2126 wc.vendor_err);
2127 }
2128 isert_conn->post_recv_buf_count--;
2129 isert_cq_rx_comp_err(isert_conn);
2130 }
2131 }
2132
2133 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2134 }
2135
2136 static void
2137 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2138 {
2139 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2140
2141 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2142 }
2143
2144 static int
2145 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2146 {
2147 struct ib_send_wr *wr_failed;
2148 int ret;
2149
2150 atomic_inc(&isert_conn->post_send_buf_count);
2151
2152 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2153 &wr_failed);
2154 if (ret) {
2155 pr_err("ib_post_send failed with %d\n", ret);
2156 atomic_dec(&isert_conn->post_send_buf_count);
2157 return ret;
2158 }
2159 return ret;
2160 }
2161
2162 static int
2163 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2164 {
2165 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2166 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2167 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2168 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2169 &isert_cmd->tx_desc.iscsi_header;
2170
2171 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2172 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2173 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2174 /*
2175 * Attach SENSE DATA payload to iSCSI Response PDU
2176 */
2177 if (cmd->se_cmd.sense_buffer &&
2178 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2179 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2180 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2181 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2182 u32 padding, pdu_len;
2183
2184 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2185 cmd->sense_buffer);
2186 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2187
2188 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2189 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2190 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2191
2192 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2193 (void *)cmd->sense_buffer, pdu_len,
2194 DMA_TO_DEVICE);
2195
2196 isert_cmd->pdu_buf_len = pdu_len;
2197 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2198 tx_dsg->length = pdu_len;
2199 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2200 isert_cmd->tx_desc.num_sge = 2;
2201 }
2202
2203 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2204
2205 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2206
2207 return isert_post_response(isert_conn, isert_cmd);
2208 }
2209
2210 static void
2211 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2212 {
2213 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2214 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2215 struct isert_device *device = isert_conn->conn_device;
2216
2217 spin_lock_bh(&conn->cmd_lock);
2218 if (!list_empty(&cmd->i_conn_node))
2219 list_del_init(&cmd->i_conn_node);
2220 spin_unlock_bh(&conn->cmd_lock);
2221
2222 if (cmd->data_direction == DMA_TO_DEVICE)
2223 iscsit_stop_dataout_timer(cmd);
2224
2225 device->unreg_rdma_mem(isert_cmd, isert_conn);
2226 }
2227
2228 static enum target_prot_op
2229 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2230 {
2231 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2232 struct isert_device *device = isert_conn->conn_device;
2233
2234 if (device->pi_capable)
2235 return TARGET_PROT_ALL;
2236
2237 return TARGET_PROT_NORMAL;
2238 }
2239
2240 static int
2241 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2242 bool nopout_response)
2243 {
2244 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2245 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2246 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2247
2248 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2249 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2250 &isert_cmd->tx_desc.iscsi_header,
2251 nopout_response);
2252 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2253 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2254
2255 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2256
2257 return isert_post_response(isert_conn, isert_cmd);
2258 }
2259
2260 static int
2261 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2262 {
2263 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2264 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2265 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2266
2267 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2268 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2269 &isert_cmd->tx_desc.iscsi_header);
2270 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2271 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2272
2273 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2274
2275 return isert_post_response(isert_conn, isert_cmd);
2276 }
2277
2278 static int
2279 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2280 {
2281 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2282 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2283 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2284
2285 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2286 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2287 &isert_cmd->tx_desc.iscsi_header);
2288 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2289 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2290
2291 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2292
2293 return isert_post_response(isert_conn, isert_cmd);
2294 }
2295
2296 static int
2297 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2298 {
2299 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2300 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2301 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2302 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2303 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2304 struct iscsi_reject *hdr =
2305 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2306
2307 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2308 iscsit_build_reject(cmd, conn, hdr);
2309 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2310
2311 hton24(hdr->dlength, ISCSI_HDR_LEN);
2312 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2313 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2314 DMA_TO_DEVICE);
2315 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2316 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2317 tx_dsg->length = ISCSI_HDR_LEN;
2318 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2319 isert_cmd->tx_desc.num_sge = 2;
2320
2321 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2322
2323 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2324
2325 return isert_post_response(isert_conn, isert_cmd);
2326 }
2327
2328 static int
2329 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2330 {
2331 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2332 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2333 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2334 struct iscsi_text_rsp *hdr =
2335 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2336 u32 txt_rsp_len;
2337 int rc;
2338
2339 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2340 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2341 if (rc < 0)
2342 return rc;
2343
2344 txt_rsp_len = rc;
2345 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2346
2347 if (txt_rsp_len) {
2348 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2349 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2350 void *txt_rsp_buf = cmd->buf_ptr;
2351
2352 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2353 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2354
2355 isert_cmd->pdu_buf_len = txt_rsp_len;
2356 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2357 tx_dsg->length = txt_rsp_len;
2358 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2359 isert_cmd->tx_desc.num_sge = 2;
2360 }
2361 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2362
2363 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2364
2365 return isert_post_response(isert_conn, isert_cmd);
2366 }
2367
2368 static int
2369 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2370 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2371 u32 data_left, u32 offset)
2372 {
2373 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2374 struct scatterlist *sg_start, *tmp_sg;
2375 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2376 u32 sg_off, page_off;
2377 int i = 0, sg_nents;
2378
2379 sg_off = offset / PAGE_SIZE;
2380 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2381 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2382 page_off = offset % PAGE_SIZE;
2383
2384 send_wr->sg_list = ib_sge;
2385 send_wr->num_sge = sg_nents;
2386 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2387 /*
2388 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2389 */
2390 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2391 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2392 (unsigned long long)tmp_sg->dma_address,
2393 tmp_sg->length, page_off);
2394
2395 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2396 ib_sge->length = min_t(u32, data_left,
2397 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2398 ib_sge->lkey = isert_conn->conn_mr->lkey;
2399
2400 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2401 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2402 page_off = 0;
2403 data_left -= ib_sge->length;
2404 ib_sge++;
2405 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2406 }
2407
2408 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2409 send_wr->sg_list, send_wr->num_sge);
2410
2411 return sg_nents;
2412 }
2413
2414 static int
2415 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2416 struct isert_rdma_wr *wr)
2417 {
2418 struct se_cmd *se_cmd = &cmd->se_cmd;
2419 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2420 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2421 struct isert_data_buf *data = &wr->data;
2422 struct ib_send_wr *send_wr;
2423 struct ib_sge *ib_sge;
2424 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2425 int ret = 0, i, ib_sge_cnt;
2426
2427 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2428
2429 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2430 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2431 se_cmd->t_data_nents, se_cmd->data_length,
2432 offset, wr->iser_ib_op, &wr->data);
2433 if (ret)
2434 return ret;
2435
2436 data_left = data->len;
2437 offset = data->offset;
2438
2439 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2440 if (!ib_sge) {
2441 pr_warn("Unable to allocate ib_sge\n");
2442 ret = -ENOMEM;
2443 goto unmap_cmd;
2444 }
2445 wr->ib_sge = ib_sge;
2446
2447 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2448 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2449 GFP_KERNEL);
2450 if (!wr->send_wr) {
2451 pr_debug("Unable to allocate wr->send_wr\n");
2452 ret = -ENOMEM;
2453 goto unmap_cmd;
2454 }
2455
2456 wr->isert_cmd = isert_cmd;
2457 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2458
2459 for (i = 0; i < wr->send_wr_num; i++) {
2460 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2461 data_len = min(data_left, rdma_write_max);
2462
2463 send_wr->send_flags = 0;
2464 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2465 send_wr->opcode = IB_WR_RDMA_WRITE;
2466 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2467 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2468 if (i + 1 == wr->send_wr_num)
2469 send_wr->next = &isert_cmd->tx_desc.send_wr;
2470 else
2471 send_wr->next = &wr->send_wr[i + 1];
2472 } else {
2473 send_wr->opcode = IB_WR_RDMA_READ;
2474 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2475 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2476 if (i + 1 == wr->send_wr_num)
2477 send_wr->send_flags = IB_SEND_SIGNALED;
2478 else
2479 send_wr->next = &wr->send_wr[i + 1];
2480 }
2481
2482 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2483 send_wr, data_len, offset);
2484 ib_sge += ib_sge_cnt;
2485
2486 offset += data_len;
2487 va_offset += data_len;
2488 data_left -= data_len;
2489 }
2490
2491 return 0;
2492 unmap_cmd:
2493 isert_unmap_data_buf(isert_conn, data);
2494
2495 return ret;
2496 }
2497
2498 static int
2499 isert_map_fr_pagelist(struct ib_device *ib_dev,
2500 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2501 {
2502 u64 start_addr, end_addr, page, chunk_start = 0;
2503 struct scatterlist *tmp_sg;
2504 int i = 0, new_chunk, last_ent, n_pages;
2505
2506 n_pages = 0;
2507 new_chunk = 1;
2508 last_ent = sg_nents - 1;
2509 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2510 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2511 if (new_chunk)
2512 chunk_start = start_addr;
2513 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2514
2515 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2516 i, (unsigned long long)tmp_sg->dma_address,
2517 tmp_sg->length);
2518
2519 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2520 new_chunk = 0;
2521 continue;
2522 }
2523 new_chunk = 1;
2524
2525 page = chunk_start & PAGE_MASK;
2526 do {
2527 fr_pl[n_pages++] = page;
2528 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2529 n_pages - 1, page);
2530 page += PAGE_SIZE;
2531 } while (page < end_addr);
2532 }
2533
2534 return n_pages;
2535 }
2536
2537 static int
2538 isert_fast_reg_mr(struct isert_conn *isert_conn,
2539 struct fast_reg_descriptor *fr_desc,
2540 struct isert_data_buf *mem,
2541 enum isert_indicator ind,
2542 struct ib_sge *sge)
2543 {
2544 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2545 struct ib_mr *mr;
2546 struct ib_fast_reg_page_list *frpl;
2547 struct ib_send_wr fr_wr, inv_wr;
2548 struct ib_send_wr *bad_wr, *wr = NULL;
2549 int ret, pagelist_len;
2550 u32 page_off;
2551 u8 key;
2552
2553 if (mem->dma_nents == 1) {
2554 sge->lkey = isert_conn->conn_mr->lkey;
2555 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2556 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2557 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2558 __func__, __LINE__, sge->addr, sge->length,
2559 sge->lkey);
2560 return 0;
2561 }
2562
2563 if (ind == ISERT_DATA_KEY_VALID) {
2564 /* Registering data buffer */
2565 mr = fr_desc->data_mr;
2566 frpl = fr_desc->data_frpl;
2567 } else {
2568 /* Registering protection buffer */
2569 mr = fr_desc->pi_ctx->prot_mr;
2570 frpl = fr_desc->pi_ctx->prot_frpl;
2571 }
2572
2573 page_off = mem->offset % PAGE_SIZE;
2574
2575 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2576 fr_desc, mem->nents, mem->offset);
2577
2578 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2579 &frpl->page_list[0]);
2580
2581 if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2582 memset(&inv_wr, 0, sizeof(inv_wr));
2583 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2584 inv_wr.opcode = IB_WR_LOCAL_INV;
2585 inv_wr.ex.invalidate_rkey = mr->rkey;
2586 wr = &inv_wr;
2587 /* Bump the key */
2588 key = (u8)(mr->rkey & 0x000000FF);
2589 ib_update_fast_reg_key(mr, ++key);
2590 }
2591
2592 /* Prepare FASTREG WR */
2593 memset(&fr_wr, 0, sizeof(fr_wr));
2594 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2595 fr_wr.opcode = IB_WR_FAST_REG_MR;
2596 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2597 fr_wr.wr.fast_reg.page_list = frpl;
2598 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2599 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2600 fr_wr.wr.fast_reg.length = mem->len;
2601 fr_wr.wr.fast_reg.rkey = mr->rkey;
2602 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2603
2604 if (!wr)
2605 wr = &fr_wr;
2606 else
2607 wr->next = &fr_wr;
2608
2609 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2610 if (ret) {
2611 pr_err("fast registration failed, ret:%d\n", ret);
2612 return ret;
2613 }
2614 fr_desc->ind &= ~ind;
2615
2616 sge->lkey = mr->lkey;
2617 sge->addr = frpl->page_list[0] + page_off;
2618 sge->length = mem->len;
2619
2620 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2621 __func__, __LINE__, sge->addr, sge->length,
2622 sge->lkey);
2623
2624 return ret;
2625 }
2626
2627 static inline void
2628 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2629 struct ib_sig_domain *domain)
2630 {
2631 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2632 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2633 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2634 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2635 /*
2636 * At the moment we hard code those, but if in the future
2637 * the target core would like to use it, we will take it
2638 * from se_cmd.
2639 */
2640 domain->sig.dif.apptag_check_mask = 0xffff;
2641 domain->sig.dif.app_escape = true;
2642 domain->sig.dif.ref_escape = true;
2643 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2644 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2645 domain->sig.dif.ref_remap = true;
2646 };
2647
2648 static int
2649 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2650 {
2651 switch (se_cmd->prot_op) {
2652 case TARGET_PROT_DIN_INSERT:
2653 case TARGET_PROT_DOUT_STRIP:
2654 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2655 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2656 break;
2657 case TARGET_PROT_DOUT_INSERT:
2658 case TARGET_PROT_DIN_STRIP:
2659 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2660 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2661 break;
2662 case TARGET_PROT_DIN_PASS:
2663 case TARGET_PROT_DOUT_PASS:
2664 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2665 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2666 break;
2667 default:
2668 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2669 return -EINVAL;
2670 }
2671
2672 return 0;
2673 }
2674
2675 static inline u8
2676 isert_set_prot_checks(u8 prot_checks)
2677 {
2678 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2679 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2680 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2681 }
2682
2683 static int
2684 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2685 struct fast_reg_descriptor *fr_desc,
2686 struct ib_sge *data_sge, struct ib_sge *prot_sge,
2687 struct ib_sge *sig_sge)
2688 {
2689 struct ib_send_wr sig_wr, inv_wr;
2690 struct ib_send_wr *bad_wr, *wr = NULL;
2691 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2692 struct ib_sig_attrs sig_attrs;
2693 int ret;
2694 u32 key;
2695
2696 memset(&sig_attrs, 0, sizeof(sig_attrs));
2697 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2698 if (ret)
2699 goto err;
2700
2701 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2702
2703 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2704 memset(&inv_wr, 0, sizeof(inv_wr));
2705 inv_wr.opcode = IB_WR_LOCAL_INV;
2706 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2707 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2708 wr = &inv_wr;
2709 /* Bump the key */
2710 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2711 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2712 }
2713
2714 memset(&sig_wr, 0, sizeof(sig_wr));
2715 sig_wr.opcode = IB_WR_REG_SIG_MR;
2716 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2717 sig_wr.sg_list = data_sge;
2718 sig_wr.num_sge = 1;
2719 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2720 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2721 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2722 if (se_cmd->t_prot_sg)
2723 sig_wr.wr.sig_handover.prot = prot_sge;
2724
2725 if (!wr)
2726 wr = &sig_wr;
2727 else
2728 wr->next = &sig_wr;
2729
2730 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2731 if (ret) {
2732 pr_err("fast registration failed, ret:%d\n", ret);
2733 goto err;
2734 }
2735 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2736
2737 sig_sge->lkey = pi_ctx->sig_mr->lkey;
2738 sig_sge->addr = 0;
2739 sig_sge->length = se_cmd->data_length;
2740 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2741 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2742 /*
2743 * We have protection guards on the wire
2744 * so we need to set a larget transfer
2745 */
2746 sig_sge->length += se_cmd->prot_length;
2747
2748 pr_debug("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2749 sig_sge->addr, sig_sge->length,
2750 sig_sge->lkey);
2751 err:
2752 return ret;
2753 }
2754
2755 static int
2756 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2757 struct isert_rdma_wr *wr)
2758 {
2759 struct se_cmd *se_cmd = &cmd->se_cmd;
2760 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2761 struct isert_conn *isert_conn = conn->context;
2762 struct ib_sge data_sge;
2763 struct ib_send_wr *send_wr;
2764 struct fast_reg_descriptor *fr_desc = NULL;
2765 u32 offset;
2766 int ret = 0;
2767 unsigned long flags;
2768
2769 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2770
2771 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2772 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2773 se_cmd->t_data_nents, se_cmd->data_length,
2774 offset, wr->iser_ib_op, &wr->data);
2775 if (ret)
2776 return ret;
2777
2778 if (wr->data.dma_nents != 1 ||
2779 se_cmd->prot_op != TARGET_PROT_NORMAL) {
2780 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2781 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2782 struct fast_reg_descriptor, list);
2783 list_del(&fr_desc->list);
2784 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2785 wr->fr_desc = fr_desc;
2786 }
2787
2788 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2789 ISERT_DATA_KEY_VALID, &data_sge);
2790 if (ret)
2791 goto unmap_cmd;
2792
2793 if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2794 struct ib_sge prot_sge, sig_sge;
2795
2796 if (se_cmd->t_prot_sg) {
2797 ret = isert_map_data_buf(isert_conn, isert_cmd,
2798 se_cmd->t_prot_sg,
2799 se_cmd->t_prot_nents,
2800 se_cmd->prot_length,
2801 0, wr->iser_ib_op, &wr->prot);
2802 if (ret)
2803 goto unmap_cmd;
2804
2805 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2806 ISERT_PROT_KEY_VALID, &prot_sge);
2807 if (ret)
2808 goto unmap_prot_cmd;
2809 }
2810
2811 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2812 &data_sge, &prot_sge, &sig_sge);
2813 if (ret)
2814 goto unmap_prot_cmd;
2815
2816 fr_desc->ind |= ISERT_PROTECTED;
2817 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2818 } else
2819 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2820
2821 wr->ib_sge = &wr->s_ib_sge;
2822 wr->send_wr_num = 1;
2823 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2824 wr->send_wr = &wr->s_send_wr;
2825 wr->isert_cmd = isert_cmd;
2826
2827 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2828 send_wr->sg_list = &wr->s_ib_sge;
2829 send_wr->num_sge = 1;
2830 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2831 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2832 send_wr->opcode = IB_WR_RDMA_WRITE;
2833 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2834 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2835 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2836 0 : IB_SEND_SIGNALED;
2837 } else {
2838 send_wr->opcode = IB_WR_RDMA_READ;
2839 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2840 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2841 send_wr->send_flags = IB_SEND_SIGNALED;
2842 }
2843
2844 return 0;
2845 unmap_prot_cmd:
2846 if (se_cmd->t_prot_sg)
2847 isert_unmap_data_buf(isert_conn, &wr->prot);
2848 unmap_cmd:
2849 if (fr_desc) {
2850 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2851 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2852 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2853 }
2854 isert_unmap_data_buf(isert_conn, &wr->data);
2855
2856 return ret;
2857 }
2858
2859 static int
2860 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2861 {
2862 struct se_cmd *se_cmd = &cmd->se_cmd;
2863 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2864 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2865 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2866 struct isert_device *device = isert_conn->conn_device;
2867 struct ib_send_wr *wr_failed;
2868 int rc;
2869
2870 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2871 isert_cmd, se_cmd->data_length);
2872 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2873 rc = device->reg_rdma_mem(conn, cmd, wr);
2874 if (rc) {
2875 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2876 return rc;
2877 }
2878
2879 if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2880 /*
2881 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2882 */
2883 isert_create_send_desc(isert_conn, isert_cmd,
2884 &isert_cmd->tx_desc);
2885 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2886 &isert_cmd->tx_desc.iscsi_header);
2887 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2888 isert_init_send_wr(isert_conn, isert_cmd,
2889 &isert_cmd->tx_desc.send_wr, false);
2890 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2891 wr->send_wr_num += 1;
2892 }
2893
2894 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2895
2896 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2897 if (rc) {
2898 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2899 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2900 }
2901
2902 if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2903 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2904 "READ\n", isert_cmd);
2905 else
2906 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2907 isert_cmd);
2908
2909 return 1;
2910 }
2911
2912 static int
2913 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2914 {
2915 struct se_cmd *se_cmd = &cmd->se_cmd;
2916 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2917 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2918 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2919 struct isert_device *device = isert_conn->conn_device;
2920 struct ib_send_wr *wr_failed;
2921 int rc;
2922
2923 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2924 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2925 wr->iser_ib_op = ISER_IB_RDMA_READ;
2926 rc = device->reg_rdma_mem(conn, cmd, wr);
2927 if (rc) {
2928 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2929 return rc;
2930 }
2931
2932 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2933
2934 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2935 if (rc) {
2936 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2937 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2938 }
2939 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2940 isert_cmd);
2941
2942 return 0;
2943 }
2944
2945 static int
2946 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2947 {
2948 int ret;
2949
2950 switch (state) {
2951 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2952 ret = isert_put_nopin(cmd, conn, false);
2953 break;
2954 default:
2955 pr_err("Unknown immediate state: 0x%02x\n", state);
2956 ret = -EINVAL;
2957 break;
2958 }
2959
2960 return ret;
2961 }
2962
2963 static int
2964 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2965 {
2966 int ret;
2967
2968 switch (state) {
2969 case ISTATE_SEND_LOGOUTRSP:
2970 ret = isert_put_logout_rsp(cmd, conn);
2971 if (!ret) {
2972 pr_debug("Returning iSER Logout -EAGAIN\n");
2973 ret = -EAGAIN;
2974 }
2975 break;
2976 case ISTATE_SEND_NOPIN:
2977 ret = isert_put_nopin(cmd, conn, true);
2978 break;
2979 case ISTATE_SEND_TASKMGTRSP:
2980 ret = isert_put_tm_rsp(cmd, conn);
2981 break;
2982 case ISTATE_SEND_REJECT:
2983 ret = isert_put_reject(cmd, conn);
2984 break;
2985 case ISTATE_SEND_TEXTRSP:
2986 ret = isert_put_text_rsp(cmd, conn);
2987 break;
2988 case ISTATE_SEND_STATUS:
2989 /*
2990 * Special case for sending non GOOD SCSI status from TX thread
2991 * context during pre se_cmd excecution failure.
2992 */
2993 ret = isert_put_response(conn, cmd);
2994 break;
2995 default:
2996 pr_err("Unknown response state: 0x%02x\n", state);
2997 ret = -EINVAL;
2998 break;
2999 }
3000
3001 return ret;
3002 }
3003
3004 static int
3005 isert_setup_np(struct iscsi_np *np,
3006 struct __kernel_sockaddr_storage *ksockaddr)
3007 {
3008 struct isert_np *isert_np;
3009 struct rdma_cm_id *isert_lid;
3010 struct sockaddr *sa;
3011 int ret;
3012
3013 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3014 if (!isert_np) {
3015 pr_err("Unable to allocate struct isert_np\n");
3016 return -ENOMEM;
3017 }
3018 sema_init(&isert_np->np_sem, 0);
3019 mutex_init(&isert_np->np_accept_mutex);
3020 INIT_LIST_HEAD(&isert_np->np_accept_list);
3021 init_completion(&isert_np->np_login_comp);
3022
3023 sa = (struct sockaddr *)ksockaddr;
3024 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3025 /*
3026 * Setup the np->np_sockaddr from the passed sockaddr setup
3027 * in iscsi_target_configfs.c code..
3028 */
3029 memcpy(&np->np_sockaddr, ksockaddr,
3030 sizeof(struct __kernel_sockaddr_storage));
3031
3032 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3033 IB_QPT_RC);
3034 if (IS_ERR(isert_lid)) {
3035 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3036 PTR_ERR(isert_lid));
3037 ret = PTR_ERR(isert_lid);
3038 goto out;
3039 }
3040
3041 ret = rdma_bind_addr(isert_lid, sa);
3042 if (ret) {
3043 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3044 goto out_lid;
3045 }
3046
3047 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3048 if (ret) {
3049 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3050 goto out_lid;
3051 }
3052
3053 isert_np->np_cm_id = isert_lid;
3054 np->np_context = isert_np;
3055 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3056
3057 return 0;
3058
3059 out_lid:
3060 rdma_destroy_id(isert_lid);
3061 out:
3062 kfree(isert_np);
3063 return ret;
3064 }
3065
3066 static int
3067 isert_rdma_accept(struct isert_conn *isert_conn)
3068 {
3069 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3070 struct rdma_conn_param cp;
3071 int ret;
3072
3073 memset(&cp, 0, sizeof(struct rdma_conn_param));
3074 cp.initiator_depth = isert_conn->initiator_depth;
3075 cp.retry_count = 7;
3076 cp.rnr_retry_count = 7;
3077
3078 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3079
3080 ret = rdma_accept(cm_id, &cp);
3081 if (ret) {
3082 pr_err("rdma_accept() failed with: %d\n", ret);
3083 return ret;
3084 }
3085
3086 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3087
3088 return 0;
3089 }
3090
3091 static int
3092 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3093 {
3094 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3095 int ret;
3096
3097 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3098 /*
3099 * For login requests after the first PDU, isert_rx_login_req() will
3100 * kick schedule_delayed_work(&conn->login_work) as the packet is
3101 * received, which turns this callback from iscsi_target_do_login_rx()
3102 * into a NOP.
3103 */
3104 if (!login->first_request)
3105 return 0;
3106
3107 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3108 if (ret)
3109 return ret;
3110
3111 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3112 return 0;
3113 }
3114
3115 static void
3116 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3117 struct isert_conn *isert_conn)
3118 {
3119 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3120 struct rdma_route *cm_route = &cm_id->route;
3121 struct sockaddr_in *sock_in;
3122 struct sockaddr_in6 *sock_in6;
3123
3124 conn->login_family = np->np_sockaddr.ss_family;
3125
3126 if (np->np_sockaddr.ss_family == AF_INET6) {
3127 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3128 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3129 &sock_in6->sin6_addr.in6_u);
3130 conn->login_port = ntohs(sock_in6->sin6_port);
3131
3132 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3133 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3134 &sock_in6->sin6_addr.in6_u);
3135 conn->local_port = ntohs(sock_in6->sin6_port);
3136 } else {
3137 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3138 sprintf(conn->login_ip, "%pI4",
3139 &sock_in->sin_addr.s_addr);
3140 conn->login_port = ntohs(sock_in->sin_port);
3141
3142 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3143 sprintf(conn->local_ip, "%pI4",
3144 &sock_in->sin_addr.s_addr);
3145 conn->local_port = ntohs(sock_in->sin_port);
3146 }
3147 }
3148
3149 static int
3150 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3151 {
3152 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3153 struct isert_conn *isert_conn;
3154 int max_accept = 0, ret;
3155
3156 accept_wait:
3157 ret = down_interruptible(&isert_np->np_sem);
3158 if (ret || max_accept > 5)
3159 return -ENODEV;
3160
3161 spin_lock_bh(&np->np_thread_lock);
3162 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3163 spin_unlock_bh(&np->np_thread_lock);
3164 pr_debug("np_thread_state %d for isert_accept_np\n",
3165 np->np_thread_state);
3166 /**
3167 * No point in stalling here when np_thread
3168 * is in state RESET/SHUTDOWN/EXIT - bail
3169 **/
3170 return -ENODEV;
3171 }
3172 spin_unlock_bh(&np->np_thread_lock);
3173
3174 mutex_lock(&isert_np->np_accept_mutex);
3175 if (list_empty(&isert_np->np_accept_list)) {
3176 mutex_unlock(&isert_np->np_accept_mutex);
3177 max_accept++;
3178 goto accept_wait;
3179 }
3180 isert_conn = list_first_entry(&isert_np->np_accept_list,
3181 struct isert_conn, conn_accept_node);
3182 list_del_init(&isert_conn->conn_accept_node);
3183 mutex_unlock(&isert_np->np_accept_mutex);
3184
3185 conn->context = isert_conn;
3186 isert_conn->conn = conn;
3187 max_accept = 0;
3188
3189 ret = isert_rdma_post_recvl(isert_conn);
3190 if (ret)
3191 return ret;
3192
3193 ret = isert_rdma_accept(isert_conn);
3194 if (ret)
3195 return ret;
3196
3197 isert_set_conn_info(np, conn, isert_conn);
3198
3199 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3200 return 0;
3201 }
3202
3203 static void
3204 isert_free_np(struct iscsi_np *np)
3205 {
3206 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3207
3208 if (isert_np->np_cm_id)
3209 rdma_destroy_id(isert_np->np_cm_id);
3210
3211 np->np_context = NULL;
3212 kfree(isert_np);
3213 }
3214
3215 static void isert_wait_conn(struct iscsi_conn *conn)
3216 {
3217 struct isert_conn *isert_conn = conn->context;
3218
3219 pr_debug("isert_wait_conn: Starting \n");
3220
3221 mutex_lock(&isert_conn->conn_mutex);
3222 if (isert_conn->conn_cm_id && !isert_conn->disconnect) {
3223 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3224 rdma_disconnect(isert_conn->conn_cm_id);
3225 }
3226 /*
3227 * Only wait for conn_wait_comp_err if the isert_conn made it
3228 * into full feature phase..
3229 */
3230 if (isert_conn->state == ISER_CONN_INIT) {
3231 mutex_unlock(&isert_conn->conn_mutex);
3232 return;
3233 }
3234 if (isert_conn->state == ISER_CONN_UP)
3235 isert_conn->state = ISER_CONN_TERMINATING;
3236 mutex_unlock(&isert_conn->conn_mutex);
3237
3238 wait_for_completion(&isert_conn->conn_wait_comp_err);
3239
3240 wait_for_completion(&isert_conn->conn_wait);
3241 isert_put_conn(isert_conn);
3242 }
3243
3244 static void isert_free_conn(struct iscsi_conn *conn)
3245 {
3246 struct isert_conn *isert_conn = conn->context;
3247
3248 isert_put_conn(isert_conn);
3249 }
3250
3251 static struct iscsit_transport iser_target_transport = {
3252 .name = "IB/iSER",
3253 .transport_type = ISCSI_INFINIBAND,
3254 .priv_size = sizeof(struct isert_cmd),
3255 .owner = THIS_MODULE,
3256 .iscsit_setup_np = isert_setup_np,
3257 .iscsit_accept_np = isert_accept_np,
3258 .iscsit_free_np = isert_free_np,
3259 .iscsit_wait_conn = isert_wait_conn,
3260 .iscsit_free_conn = isert_free_conn,
3261 .iscsit_get_login_rx = isert_get_login_rx,
3262 .iscsit_put_login_tx = isert_put_login_tx,
3263 .iscsit_immediate_queue = isert_immediate_queue,
3264 .iscsit_response_queue = isert_response_queue,
3265 .iscsit_get_dataout = isert_get_dataout,
3266 .iscsit_queue_data_in = isert_put_datain,
3267 .iscsit_queue_status = isert_put_response,
3268 .iscsit_aborted_task = isert_aborted_task,
3269 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3270 };
3271
3272 static int __init isert_init(void)
3273 {
3274 int ret;
3275
3276 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3277 if (!isert_rx_wq) {
3278 pr_err("Unable to allocate isert_rx_wq\n");
3279 return -ENOMEM;
3280 }
3281
3282 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3283 if (!isert_comp_wq) {
3284 pr_err("Unable to allocate isert_comp_wq\n");
3285 ret = -ENOMEM;
3286 goto destroy_rx_wq;
3287 }
3288
3289 iscsit_register_transport(&iser_target_transport);
3290 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3291 return 0;
3292
3293 destroy_rx_wq:
3294 destroy_workqueue(isert_rx_wq);
3295 return ret;
3296 }
3297
3298 static void __exit isert_exit(void)
3299 {
3300 flush_scheduled_work();
3301 destroy_workqueue(isert_comp_wq);
3302 destroy_workqueue(isert_rx_wq);
3303 iscsit_unregister_transport(&iser_target_transport);
3304 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3305 }
3306
3307 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3308 MODULE_VERSION("0.1");
3309 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3310 MODULE_LICENSE("GPL");
3311
3312 module_init(isert_init);
3313 module_exit(isert_exit);
Linux kernel - Deliverables
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