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Target/iser: Don't put isert_conn inside disconnected handler
[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_READ..
119 */
120 attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
121 isert_conn->max_sge = attr.cap.max_send_sge;
122
123 attr.cap.max_recv_sge = 1;
124 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
125 attr.qp_type = IB_QPT_RC;
126 if (protection)
127 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
128
129 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
130 cma_id->device);
131 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
132 isert_conn->conn_pd->device);
133
134 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
135 if (ret) {
136 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
137 return ret;
138 }
139 isert_conn->conn_qp = cma_id->qp;
140 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
141
142 return 0;
143 }
144
145 static void
146 isert_cq_event_callback(struct ib_event *e, void *context)
147 {
148 pr_debug("isert_cq_event_callback event: %d\n", e->event);
149 }
150
151 static int
152 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
153 {
154 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
155 struct iser_rx_desc *rx_desc;
156 struct ib_sge *rx_sg;
157 u64 dma_addr;
158 int i, j;
159
160 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
161 sizeof(struct iser_rx_desc), GFP_KERNEL);
162 if (!isert_conn->conn_rx_descs)
163 goto fail;
164
165 rx_desc = isert_conn->conn_rx_descs;
166
167 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
168 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
169 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
170 if (ib_dma_mapping_error(ib_dev, dma_addr))
171 goto dma_map_fail;
172
173 rx_desc->dma_addr = dma_addr;
174
175 rx_sg = &rx_desc->rx_sg;
176 rx_sg->addr = rx_desc->dma_addr;
177 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
178 rx_sg->lkey = isert_conn->conn_mr->lkey;
179 }
180
181 isert_conn->conn_rx_desc_head = 0;
182 return 0;
183
184 dma_map_fail:
185 rx_desc = isert_conn->conn_rx_descs;
186 for (j = 0; j < i; j++, rx_desc++) {
187 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
188 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
189 }
190 kfree(isert_conn->conn_rx_descs);
191 isert_conn->conn_rx_descs = NULL;
192 fail:
193 return -ENOMEM;
194 }
195
196 static void
197 isert_free_rx_descriptors(struct isert_conn *isert_conn)
198 {
199 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
200 struct iser_rx_desc *rx_desc;
201 int i;
202
203 if (!isert_conn->conn_rx_descs)
204 return;
205
206 rx_desc = isert_conn->conn_rx_descs;
207 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
208 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
210 }
211
212 kfree(isert_conn->conn_rx_descs);
213 isert_conn->conn_rx_descs = NULL;
214 }
215
216 static void isert_cq_tx_work(struct work_struct *);
217 static void isert_cq_tx_callback(struct ib_cq *, void *);
218 static void isert_cq_rx_work(struct work_struct *);
219 static void isert_cq_rx_callback(struct ib_cq *, void *);
220
221 static int
222 isert_create_device_ib_res(struct isert_device *device)
223 {
224 struct ib_device *ib_dev = device->ib_device;
225 struct isert_cq_desc *cq_desc;
226 struct ib_device_attr *dev_attr;
227 int ret = 0, i, j;
228
229 dev_attr = &device->dev_attr;
230 ret = isert_query_device(ib_dev, dev_attr);
231 if (ret)
232 return ret;
233
234 /* asign function handlers */
235 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
236 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
237 device->use_fastreg = 1;
238 device->reg_rdma_mem = isert_reg_rdma;
239 device->unreg_rdma_mem = isert_unreg_rdma;
240 } else {
241 device->use_fastreg = 0;
242 device->reg_rdma_mem = isert_map_rdma;
243 device->unreg_rdma_mem = isert_unmap_cmd;
244 }
245
246 /* Check signature cap */
247 device->pi_capable = dev_attr->device_cap_flags &
248 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
249
250 device->cqs_used = min_t(int, num_online_cpus(),
251 device->ib_device->num_comp_vectors);
252 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
253 pr_debug("Using %d CQs, device %s supports %d vectors support "
254 "Fast registration %d pi_capable %d\n",
255 device->cqs_used, device->ib_device->name,
256 device->ib_device->num_comp_vectors, device->use_fastreg,
257 device->pi_capable);
258 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
259 device->cqs_used, GFP_KERNEL);
260 if (!device->cq_desc) {
261 pr_err("Unable to allocate device->cq_desc\n");
262 return -ENOMEM;
263 }
264 cq_desc = device->cq_desc;
265
266 for (i = 0; i < device->cqs_used; i++) {
267 cq_desc[i].device = device;
268 cq_desc[i].cq_index = i;
269
270 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
271 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
272 isert_cq_rx_callback,
273 isert_cq_event_callback,
274 (void *)&cq_desc[i],
275 ISER_MAX_RX_CQ_LEN, i);
276 if (IS_ERR(device->dev_rx_cq[i])) {
277 ret = PTR_ERR(device->dev_rx_cq[i]);
278 device->dev_rx_cq[i] = NULL;
279 goto out_cq;
280 }
281
282 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
283 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
284 isert_cq_tx_callback,
285 isert_cq_event_callback,
286 (void *)&cq_desc[i],
287 ISER_MAX_TX_CQ_LEN, i);
288 if (IS_ERR(device->dev_tx_cq[i])) {
289 ret = PTR_ERR(device->dev_tx_cq[i]);
290 device->dev_tx_cq[i] = NULL;
291 goto out_cq;
292 }
293
294 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
295 if (ret)
296 goto out_cq;
297
298 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
299 if (ret)
300 goto out_cq;
301 }
302
303 return 0;
304
305 out_cq:
306 for (j = 0; j < i; j++) {
307 cq_desc = &device->cq_desc[j];
308
309 if (device->dev_rx_cq[j]) {
310 cancel_work_sync(&cq_desc->cq_rx_work);
311 ib_destroy_cq(device->dev_rx_cq[j]);
312 }
313 if (device->dev_tx_cq[j]) {
314 cancel_work_sync(&cq_desc->cq_tx_work);
315 ib_destroy_cq(device->dev_tx_cq[j]);
316 }
317 }
318 kfree(device->cq_desc);
319
320 return ret;
321 }
322
323 static void
324 isert_free_device_ib_res(struct isert_device *device)
325 {
326 struct isert_cq_desc *cq_desc;
327 int i;
328
329 for (i = 0; i < device->cqs_used; i++) {
330 cq_desc = &device->cq_desc[i];
331
332 cancel_work_sync(&cq_desc->cq_rx_work);
333 cancel_work_sync(&cq_desc->cq_tx_work);
334 ib_destroy_cq(device->dev_rx_cq[i]);
335 ib_destroy_cq(device->dev_tx_cq[i]);
336 device->dev_rx_cq[i] = NULL;
337 device->dev_tx_cq[i] = NULL;
338 }
339
340 kfree(device->cq_desc);
341 }
342
343 static void
344 isert_device_try_release(struct isert_device *device)
345 {
346 mutex_lock(&device_list_mutex);
347 device->refcount--;
348 if (!device->refcount) {
349 isert_free_device_ib_res(device);
350 list_del(&device->dev_node);
351 kfree(device);
352 }
353 mutex_unlock(&device_list_mutex);
354 }
355
356 static struct isert_device *
357 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
358 {
359 struct isert_device *device;
360 int ret;
361
362 mutex_lock(&device_list_mutex);
363 list_for_each_entry(device, &device_list, dev_node) {
364 if (device->ib_device->node_guid == cma_id->device->node_guid) {
365 device->refcount++;
366 mutex_unlock(&device_list_mutex);
367 return device;
368 }
369 }
370
371 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
372 if (!device) {
373 mutex_unlock(&device_list_mutex);
374 return ERR_PTR(-ENOMEM);
375 }
376
377 INIT_LIST_HEAD(&device->dev_node);
378
379 device->ib_device = cma_id->device;
380 ret = isert_create_device_ib_res(device);
381 if (ret) {
382 kfree(device);
383 mutex_unlock(&device_list_mutex);
384 return ERR_PTR(ret);
385 }
386
387 device->refcount++;
388 list_add_tail(&device->dev_node, &device_list);
389 mutex_unlock(&device_list_mutex);
390
391 return device;
392 }
393
394 static void
395 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
396 {
397 struct fast_reg_descriptor *fr_desc, *tmp;
398 int i = 0;
399
400 if (list_empty(&isert_conn->conn_fr_pool))
401 return;
402
403 pr_debug("Freeing conn %p fastreg pool", isert_conn);
404
405 list_for_each_entry_safe(fr_desc, tmp,
406 &isert_conn->conn_fr_pool, list) {
407 list_del(&fr_desc->list);
408 ib_free_fast_reg_page_list(fr_desc->data_frpl);
409 ib_dereg_mr(fr_desc->data_mr);
410 if (fr_desc->pi_ctx) {
411 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
412 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
413 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
414 kfree(fr_desc->pi_ctx);
415 }
416 kfree(fr_desc);
417 ++i;
418 }
419
420 if (i < isert_conn->conn_fr_pool_size)
421 pr_warn("Pool still has %d regions registered\n",
422 isert_conn->conn_fr_pool_size - i);
423 }
424
425 static int
426 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
427 struct fast_reg_descriptor *fr_desc, u8 protection)
428 {
429 int ret;
430
431 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
432 ISCSI_ISER_SG_TABLESIZE);
433 if (IS_ERR(fr_desc->data_frpl)) {
434 pr_err("Failed to allocate data frpl err=%ld\n",
435 PTR_ERR(fr_desc->data_frpl));
436 return PTR_ERR(fr_desc->data_frpl);
437 }
438
439 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
440 if (IS_ERR(fr_desc->data_mr)) {
441 pr_err("Failed to allocate data frmr err=%ld\n",
442 PTR_ERR(fr_desc->data_mr));
443 ret = PTR_ERR(fr_desc->data_mr);
444 goto err_data_frpl;
445 }
446 pr_debug("Create fr_desc %p page_list %p\n",
447 fr_desc, fr_desc->data_frpl->page_list);
448 fr_desc->ind |= ISERT_DATA_KEY_VALID;
449
450 if (protection) {
451 struct ib_mr_init_attr mr_init_attr = {0};
452 struct pi_context *pi_ctx;
453
454 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
455 if (!fr_desc->pi_ctx) {
456 pr_err("Failed to allocate pi context\n");
457 ret = -ENOMEM;
458 goto err_data_mr;
459 }
460 pi_ctx = fr_desc->pi_ctx;
461
462 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
463 ISCSI_ISER_SG_TABLESIZE);
464 if (IS_ERR(pi_ctx->prot_frpl)) {
465 pr_err("Failed to allocate prot frpl err=%ld\n",
466 PTR_ERR(pi_ctx->prot_frpl));
467 ret = PTR_ERR(pi_ctx->prot_frpl);
468 goto err_pi_ctx;
469 }
470
471 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
472 if (IS_ERR(pi_ctx->prot_mr)) {
473 pr_err("Failed to allocate prot frmr err=%ld\n",
474 PTR_ERR(pi_ctx->prot_mr));
475 ret = PTR_ERR(pi_ctx->prot_mr);
476 goto err_prot_frpl;
477 }
478 fr_desc->ind |= ISERT_PROT_KEY_VALID;
479
480 mr_init_attr.max_reg_descriptors = 2;
481 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
482 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
483 if (IS_ERR(pi_ctx->sig_mr)) {
484 pr_err("Failed to allocate signature enabled mr err=%ld\n",
485 PTR_ERR(pi_ctx->sig_mr));
486 ret = PTR_ERR(pi_ctx->sig_mr);
487 goto err_prot_mr;
488 }
489 fr_desc->ind |= ISERT_SIG_KEY_VALID;
490 }
491 fr_desc->ind &= ~ISERT_PROTECTED;
492
493 return 0;
494 err_prot_mr:
495 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
496 err_prot_frpl:
497 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
498 err_pi_ctx:
499 kfree(fr_desc->pi_ctx);
500 err_data_mr:
501 ib_dereg_mr(fr_desc->data_mr);
502 err_data_frpl:
503 ib_free_fast_reg_page_list(fr_desc->data_frpl);
504
505 return ret;
506 }
507
508 static int
509 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
510 {
511 struct fast_reg_descriptor *fr_desc;
512 struct isert_device *device = isert_conn->conn_device;
513 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
515 int i, ret, tag_num;
516 /*
517 * Setup the number of FRMRs based upon the number of tags
518 * available to session in iscsi_target_locate_portal().
519 */
520 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
521 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
522
523 isert_conn->conn_fr_pool_size = 0;
524 for (i = 0; i < tag_num; i++) {
525 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
526 if (!fr_desc) {
527 pr_err("Failed to allocate fast_reg descriptor\n");
528 ret = -ENOMEM;
529 goto err;
530 }
531
532 ret = isert_create_fr_desc(device->ib_device,
533 isert_conn->conn_pd, fr_desc,
534 pi_support);
535 if (ret) {
536 pr_err("Failed to create fastreg descriptor err=%d\n",
537 ret);
538 kfree(fr_desc);
539 goto err;
540 }
541
542 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
543 isert_conn->conn_fr_pool_size++;
544 }
545
546 pr_debug("Creating conn %p fastreg pool size=%d",
547 isert_conn, isert_conn->conn_fr_pool_size);
548
549 return 0;
550
551 err:
552 isert_conn_free_fastreg_pool(isert_conn);
553 return ret;
554 }
555
556 static int
557 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
558 {
559 struct iscsi_np *np = cma_id->context;
560 struct isert_np *isert_np = np->np_context;
561 struct isert_conn *isert_conn;
562 struct isert_device *device;
563 struct ib_device *ib_dev = cma_id->device;
564 int ret = 0;
565 u8 pi_support;
566
567 spin_lock_bh(&np->np_thread_lock);
568 if (!np->enabled) {
569 spin_unlock_bh(&np->np_thread_lock);
570 pr_debug("iscsi_np is not enabled, reject connect request\n");
571 return rdma_reject(cma_id, NULL, 0);
572 }
573 spin_unlock_bh(&np->np_thread_lock);
574
575 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
576 cma_id, cma_id->context);
577
578 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
579 if (!isert_conn) {
580 pr_err("Unable to allocate isert_conn\n");
581 return -ENOMEM;
582 }
583 isert_conn->state = ISER_CONN_INIT;
584 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
585 init_completion(&isert_conn->conn_login_comp);
586 init_completion(&isert_conn->conn_wait);
587 init_completion(&isert_conn->conn_wait_comp_err);
588 kref_init(&isert_conn->conn_kref);
589 mutex_init(&isert_conn->conn_mutex);
590 spin_lock_init(&isert_conn->conn_lock);
591 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
592
593 cma_id->context = isert_conn;
594 isert_conn->conn_cm_id = cma_id;
595 isert_conn->responder_resources = event->param.conn.responder_resources;
596 isert_conn->initiator_depth = event->param.conn.initiator_depth;
597 pr_debug("Using responder_resources: %u initiator_depth: %u\n",
598 isert_conn->responder_resources, isert_conn->initiator_depth);
599
600 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
601 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
602 if (!isert_conn->login_buf) {
603 pr_err("Unable to allocate isert_conn->login_buf\n");
604 ret = -ENOMEM;
605 goto out;
606 }
607
608 isert_conn->login_req_buf = isert_conn->login_buf;
609 isert_conn->login_rsp_buf = isert_conn->login_buf +
610 ISCSI_DEF_MAX_RECV_SEG_LEN;
611 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
612 isert_conn->login_buf, isert_conn->login_req_buf,
613 isert_conn->login_rsp_buf);
614
615 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
616 (void *)isert_conn->login_req_buf,
617 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
618
619 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
620 if (ret) {
621 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
622 ret);
623 isert_conn->login_req_dma = 0;
624 goto out_login_buf;
625 }
626
627 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
628 (void *)isert_conn->login_rsp_buf,
629 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
630
631 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
632 if (ret) {
633 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
634 ret);
635 isert_conn->login_rsp_dma = 0;
636 goto out_req_dma_map;
637 }
638
639 device = isert_device_find_by_ib_dev(cma_id);
640 if (IS_ERR(device)) {
641 ret = PTR_ERR(device);
642 goto out_rsp_dma_map;
643 }
644
645 isert_conn->conn_device = device;
646 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
647 if (IS_ERR(isert_conn->conn_pd)) {
648 ret = PTR_ERR(isert_conn->conn_pd);
649 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
650 isert_conn, ret);
651 goto out_pd;
652 }
653
654 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
655 IB_ACCESS_LOCAL_WRITE);
656 if (IS_ERR(isert_conn->conn_mr)) {
657 ret = PTR_ERR(isert_conn->conn_mr);
658 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
659 isert_conn, ret);
660 goto out_mr;
661 }
662
663 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
664 if (pi_support && !device->pi_capable) {
665 pr_err("Protection information requested but not supported, "
666 "rejecting connect request\n");
667 ret = rdma_reject(cma_id, NULL, 0);
668 goto out_mr;
669 }
670
671 ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
672 if (ret)
673 goto out_conn_dev;
674
675 mutex_lock(&isert_np->np_accept_mutex);
676 list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
677 mutex_unlock(&isert_np->np_accept_mutex);
678
679 pr_debug("isert_connect_request() up np_sem np: %p\n", np);
680 up(&isert_np->np_sem);
681 return 0;
682
683 out_conn_dev:
684 ib_dereg_mr(isert_conn->conn_mr);
685 out_mr:
686 ib_dealloc_pd(isert_conn->conn_pd);
687 out_pd:
688 isert_device_try_release(device);
689 out_rsp_dma_map:
690 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
691 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
692 out_req_dma_map:
693 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
694 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
695 out_login_buf:
696 kfree(isert_conn->login_buf);
697 out:
698 kfree(isert_conn);
699 return ret;
700 }
701
702 static void
703 isert_connect_release(struct isert_conn *isert_conn)
704 {
705 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
706 struct isert_device *device = isert_conn->conn_device;
707 int cq_index;
708
709 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
710
711 if (device && device->use_fastreg)
712 isert_conn_free_fastreg_pool(isert_conn);
713
714 if (isert_conn->conn_qp) {
715 cq_index = ((struct isert_cq_desc *)
716 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
717 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
718 isert_conn->conn_device->cq_active_qps[cq_index]--;
719
720 rdma_destroy_qp(isert_conn->conn_cm_id);
721 }
722
723 isert_free_rx_descriptors(isert_conn);
724 rdma_destroy_id(isert_conn->conn_cm_id);
725
726 ib_dereg_mr(isert_conn->conn_mr);
727 ib_dealloc_pd(isert_conn->conn_pd);
728
729 if (isert_conn->login_buf) {
730 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
731 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
732 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
733 ISCSI_DEF_MAX_RECV_SEG_LEN,
734 DMA_FROM_DEVICE);
735 kfree(isert_conn->login_buf);
736 }
737 kfree(isert_conn);
738
739 if (device)
740 isert_device_try_release(device);
741
742 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
743 }
744
745 static void
746 isert_connected_handler(struct rdma_cm_id *cma_id)
747 {
748 struct isert_conn *isert_conn = cma_id->context;
749
750 kref_get(&isert_conn->conn_kref);
751 }
752
753 static void
754 isert_release_conn_kref(struct kref *kref)
755 {
756 struct isert_conn *isert_conn = container_of(kref,
757 struct isert_conn, conn_kref);
758
759 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
760 current->comm, current->pid);
761
762 isert_connect_release(isert_conn);
763 }
764
765 static void
766 isert_put_conn(struct isert_conn *isert_conn)
767 {
768 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
769 }
770
771 static void
772 isert_disconnect_work(struct work_struct *work)
773 {
774 struct isert_conn *isert_conn = container_of(work,
775 struct isert_conn, conn_logout_work);
776
777 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
778 mutex_lock(&isert_conn->conn_mutex);
779 if (isert_conn->state == ISER_CONN_UP)
780 isert_conn->state = ISER_CONN_TERMINATING;
781
782 if (isert_conn->post_recv_buf_count == 0 &&
783 atomic_read(&isert_conn->post_send_buf_count) == 0) {
784 mutex_unlock(&isert_conn->conn_mutex);
785 goto wake_up;
786 }
787 if (!isert_conn->conn_cm_id) {
788 mutex_unlock(&isert_conn->conn_mutex);
789 isert_put_conn(isert_conn);
790 return;
791 }
792
793 if (isert_conn->disconnect) {
794 /* Send DREQ/DREP towards our initiator */
795 rdma_disconnect(isert_conn->conn_cm_id);
796 }
797
798 mutex_unlock(&isert_conn->conn_mutex);
799
800 wake_up:
801 complete(&isert_conn->conn_wait);
802 }
803
804 static void
805 isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
806 {
807 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
808
809 isert_conn->disconnect = disconnect;
810 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
811 schedule_work(&isert_conn->conn_logout_work);
812 }
813
814 static int
815 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
816 {
817 int ret = 0;
818 bool disconnect = false;
819
820 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
821 event->event, event->status, cma_id->context, cma_id);
822
823 switch (event->event) {
824 case RDMA_CM_EVENT_CONNECT_REQUEST:
825 ret = isert_connect_request(cma_id, event);
826 break;
827 case RDMA_CM_EVENT_ESTABLISHED:
828 isert_connected_handler(cma_id);
829 break;
830 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
831 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
832 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
833 disconnect = true;
834 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
835 isert_disconnected_handler(cma_id, disconnect);
836 break;
837 case RDMA_CM_EVENT_CONNECT_ERROR:
838 default:
839 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
840 break;
841 }
842
843 if (ret != 0) {
844 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
845 event->event, ret);
846 dump_stack();
847 }
848
849 return ret;
850 }
851
852 static int
853 isert_post_recv(struct isert_conn *isert_conn, u32 count)
854 {
855 struct ib_recv_wr *rx_wr, *rx_wr_failed;
856 int i, ret;
857 unsigned int rx_head = isert_conn->conn_rx_desc_head;
858 struct iser_rx_desc *rx_desc;
859
860 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
861 rx_desc = &isert_conn->conn_rx_descs[rx_head];
862 rx_wr->wr_id = (unsigned long)rx_desc;
863 rx_wr->sg_list = &rx_desc->rx_sg;
864 rx_wr->num_sge = 1;
865 rx_wr->next = rx_wr + 1;
866 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
867 }
868
869 rx_wr--;
870 rx_wr->next = NULL; /* mark end of work requests list */
871
872 isert_conn->post_recv_buf_count += count;
873 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
874 &rx_wr_failed);
875 if (ret) {
876 pr_err("ib_post_recv() failed with ret: %d\n", ret);
877 isert_conn->post_recv_buf_count -= count;
878 } else {
879 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
880 isert_conn->conn_rx_desc_head = rx_head;
881 }
882 return ret;
883 }
884
885 static int
886 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
887 {
888 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
889 struct ib_send_wr send_wr, *send_wr_failed;
890 int ret;
891
892 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
893 ISER_HEADERS_LEN, DMA_TO_DEVICE);
894
895 send_wr.next = NULL;
896 send_wr.wr_id = (unsigned long)tx_desc;
897 send_wr.sg_list = tx_desc->tx_sg;
898 send_wr.num_sge = tx_desc->num_sge;
899 send_wr.opcode = IB_WR_SEND;
900 send_wr.send_flags = IB_SEND_SIGNALED;
901
902 atomic_inc(&isert_conn->post_send_buf_count);
903
904 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
905 if (ret) {
906 pr_err("ib_post_send() failed, ret: %d\n", ret);
907 atomic_dec(&isert_conn->post_send_buf_count);
908 }
909
910 return ret;
911 }
912
913 static void
914 isert_create_send_desc(struct isert_conn *isert_conn,
915 struct isert_cmd *isert_cmd,
916 struct iser_tx_desc *tx_desc)
917 {
918 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
919
920 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
921 ISER_HEADERS_LEN, DMA_TO_DEVICE);
922
923 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
924 tx_desc->iser_header.flags = ISER_VER;
925
926 tx_desc->num_sge = 1;
927 tx_desc->isert_cmd = isert_cmd;
928
929 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
930 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
931 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
932 }
933 }
934
935 static int
936 isert_init_tx_hdrs(struct isert_conn *isert_conn,
937 struct iser_tx_desc *tx_desc)
938 {
939 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
940 u64 dma_addr;
941
942 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
943 ISER_HEADERS_LEN, DMA_TO_DEVICE);
944 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
945 pr_err("ib_dma_mapping_error() failed\n");
946 return -ENOMEM;
947 }
948
949 tx_desc->dma_addr = dma_addr;
950 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
951 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
952 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
953
954 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
955 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
956 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
957
958 return 0;
959 }
960
961 static void
962 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
963 struct ib_send_wr *send_wr, bool coalesce)
964 {
965 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
966
967 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
968 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
969 send_wr->opcode = IB_WR_SEND;
970 send_wr->sg_list = &tx_desc->tx_sg[0];
971 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
972 /*
973 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
974 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
975 */
976 mutex_lock(&isert_conn->conn_mutex);
977 if (coalesce && isert_conn->state == ISER_CONN_UP &&
978 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
979 tx_desc->llnode_active = true;
980 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
981 mutex_unlock(&isert_conn->conn_mutex);
982 return;
983 }
984 isert_conn->conn_comp_batch = 0;
985 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
986 mutex_unlock(&isert_conn->conn_mutex);
987
988 send_wr->send_flags = IB_SEND_SIGNALED;
989 }
990
991 static int
992 isert_rdma_post_recvl(struct isert_conn *isert_conn)
993 {
994 struct ib_recv_wr rx_wr, *rx_wr_fail;
995 struct ib_sge sge;
996 int ret;
997
998 memset(&sge, 0, sizeof(struct ib_sge));
999 sge.addr = isert_conn->login_req_dma;
1000 sge.length = ISER_RX_LOGIN_SIZE;
1001 sge.lkey = isert_conn->conn_mr->lkey;
1002
1003 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1004 sge.addr, sge.length, sge.lkey);
1005
1006 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1007 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1008 rx_wr.sg_list = &sge;
1009 rx_wr.num_sge = 1;
1010
1011 isert_conn->post_recv_buf_count++;
1012 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1013 if (ret) {
1014 pr_err("ib_post_recv() failed: %d\n", ret);
1015 isert_conn->post_recv_buf_count--;
1016 }
1017
1018 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1019 return ret;
1020 }
1021
1022 static int
1023 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1024 u32 length)
1025 {
1026 struct isert_conn *isert_conn = conn->context;
1027 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1028 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1029 int ret;
1030
1031 isert_create_send_desc(isert_conn, NULL, tx_desc);
1032
1033 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1034 sizeof(struct iscsi_hdr));
1035
1036 isert_init_tx_hdrs(isert_conn, tx_desc);
1037
1038 if (length > 0) {
1039 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1040
1041 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1042 length, DMA_TO_DEVICE);
1043
1044 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1045
1046 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1047 length, DMA_TO_DEVICE);
1048
1049 tx_dsg->addr = isert_conn->login_rsp_dma;
1050 tx_dsg->length = length;
1051 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1052 tx_desc->num_sge = 2;
1053 }
1054 if (!login->login_failed) {
1055 if (login->login_complete) {
1056 if (!conn->sess->sess_ops->SessionType &&
1057 isert_conn->conn_device->use_fastreg) {
1058 /* Normal Session and fastreg is used */
1059 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1060
1061 ret = isert_conn_create_fastreg_pool(isert_conn,
1062 pi_support);
1063 if (ret) {
1064 pr_err("Conn: %p failed to create"
1065 " fastreg pool\n", isert_conn);
1066 return ret;
1067 }
1068 }
1069
1070 ret = isert_alloc_rx_descriptors(isert_conn);
1071 if (ret)
1072 return ret;
1073
1074 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1075 if (ret)
1076 return ret;
1077
1078 isert_conn->state = ISER_CONN_UP;
1079 goto post_send;
1080 }
1081
1082 ret = isert_rdma_post_recvl(isert_conn);
1083 if (ret)
1084 return ret;
1085 }
1086 post_send:
1087 ret = isert_post_send(isert_conn, tx_desc);
1088 if (ret)
1089 return ret;
1090
1091 return 0;
1092 }
1093
1094 static void
1095 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1096 struct isert_conn *isert_conn)
1097 {
1098 struct iscsi_conn *conn = isert_conn->conn;
1099 struct iscsi_login *login = conn->conn_login;
1100 int size;
1101
1102 if (!login) {
1103 pr_err("conn->conn_login is NULL\n");
1104 dump_stack();
1105 return;
1106 }
1107
1108 if (login->first_request) {
1109 struct iscsi_login_req *login_req =
1110 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1111 /*
1112 * Setup the initial iscsi_login values from the leading
1113 * login request PDU.
1114 */
1115 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1116 login->current_stage =
1117 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1118 >> 2;
1119 login->version_min = login_req->min_version;
1120 login->version_max = login_req->max_version;
1121 memcpy(login->isid, login_req->isid, 6);
1122 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1123 login->init_task_tag = login_req->itt;
1124 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1125 login->cid = be16_to_cpu(login_req->cid);
1126 login->tsih = be16_to_cpu(login_req->tsih);
1127 }
1128
1129 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1130
1131 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1132 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1133 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1134 memcpy(login->req_buf, &rx_desc->data[0], size);
1135
1136 if (login->first_request) {
1137 complete(&isert_conn->conn_login_comp);
1138 return;
1139 }
1140 schedule_delayed_work(&conn->login_work, 0);
1141 }
1142
1143 static struct iscsi_cmd
1144 *isert_allocate_cmd(struct iscsi_conn *conn)
1145 {
1146 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1147 struct isert_cmd *isert_cmd;
1148 struct iscsi_cmd *cmd;
1149
1150 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1151 if (!cmd) {
1152 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1153 return NULL;
1154 }
1155 isert_cmd = iscsit_priv_cmd(cmd);
1156 isert_cmd->conn = isert_conn;
1157 isert_cmd->iscsi_cmd = cmd;
1158
1159 return cmd;
1160 }
1161
1162 static int
1163 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1164 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1165 struct iser_rx_desc *rx_desc, unsigned char *buf)
1166 {
1167 struct iscsi_conn *conn = isert_conn->conn;
1168 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1169 struct scatterlist *sg;
1170 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1171 bool dump_payload = false;
1172
1173 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1174 if (rc < 0)
1175 return rc;
1176
1177 imm_data = cmd->immediate_data;
1178 imm_data_len = cmd->first_burst_len;
1179 unsol_data = cmd->unsolicited_data;
1180
1181 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1182 if (rc < 0) {
1183 return 0;
1184 } else if (rc > 0) {
1185 dump_payload = true;
1186 goto sequence_cmd;
1187 }
1188
1189 if (!imm_data)
1190 return 0;
1191
1192 sg = &cmd->se_cmd.t_data_sg[0];
1193 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1194
1195 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1196 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1197
1198 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1199
1200 cmd->write_data_done += imm_data_len;
1201
1202 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1203 spin_lock_bh(&cmd->istate_lock);
1204 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1205 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1206 spin_unlock_bh(&cmd->istate_lock);
1207 }
1208
1209 sequence_cmd:
1210 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1211
1212 if (!rc && dump_payload == false && unsol_data)
1213 iscsit_set_unsoliticed_dataout(cmd);
1214 else if (dump_payload && imm_data)
1215 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1216
1217 return 0;
1218 }
1219
1220 static int
1221 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1222 struct iser_rx_desc *rx_desc, unsigned char *buf)
1223 {
1224 struct scatterlist *sg_start;
1225 struct iscsi_conn *conn = isert_conn->conn;
1226 struct iscsi_cmd *cmd = NULL;
1227 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1228 u32 unsol_data_len = ntoh24(hdr->dlength);
1229 int rc, sg_nents, sg_off, page_off;
1230
1231 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1232 if (rc < 0)
1233 return rc;
1234 else if (!cmd)
1235 return 0;
1236 /*
1237 * FIXME: Unexpected unsolicited_data out
1238 */
1239 if (!cmd->unsolicited_data) {
1240 pr_err("Received unexpected solicited data payload\n");
1241 dump_stack();
1242 return -1;
1243 }
1244
1245 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1246 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1247
1248 sg_off = cmd->write_data_done / PAGE_SIZE;
1249 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1250 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1251 page_off = cmd->write_data_done % PAGE_SIZE;
1252 /*
1253 * FIXME: Non page-aligned unsolicited_data out
1254 */
1255 if (page_off) {
1256 pr_err("Received unexpected non-page aligned data payload\n");
1257 dump_stack();
1258 return -1;
1259 }
1260 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1261 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1262
1263 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1264 unsol_data_len);
1265
1266 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1267 if (rc < 0)
1268 return rc;
1269
1270 return 0;
1271 }
1272
1273 static int
1274 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1275 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1276 unsigned char *buf)
1277 {
1278 struct iscsi_conn *conn = isert_conn->conn;
1279 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1280 int rc;
1281
1282 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1283 if (rc < 0)
1284 return rc;
1285 /*
1286 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1287 */
1288
1289 return iscsit_process_nop_out(conn, cmd, hdr);
1290 }
1291
1292 static int
1293 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1294 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1295 struct iscsi_text *hdr)
1296 {
1297 struct iscsi_conn *conn = isert_conn->conn;
1298 u32 payload_length = ntoh24(hdr->dlength);
1299 int rc;
1300 unsigned char *text_in;
1301
1302 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1303 if (rc < 0)
1304 return rc;
1305
1306 text_in = kzalloc(payload_length, GFP_KERNEL);
1307 if (!text_in) {
1308 pr_err("Unable to allocate text_in of payload_length: %u\n",
1309 payload_length);
1310 return -ENOMEM;
1311 }
1312 cmd->text_in_ptr = text_in;
1313
1314 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1315
1316 return iscsit_process_text_cmd(conn, cmd, hdr);
1317 }
1318
1319 static int
1320 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1321 uint32_t read_stag, uint64_t read_va,
1322 uint32_t write_stag, uint64_t write_va)
1323 {
1324 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1325 struct iscsi_conn *conn = isert_conn->conn;
1326 struct iscsi_session *sess = conn->sess;
1327 struct iscsi_cmd *cmd;
1328 struct isert_cmd *isert_cmd;
1329 int ret = -EINVAL;
1330 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1331
1332 if (sess->sess_ops->SessionType &&
1333 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1334 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1335 " ignoring\n", opcode);
1336 return 0;
1337 }
1338
1339 switch (opcode) {
1340 case ISCSI_OP_SCSI_CMD:
1341 cmd = isert_allocate_cmd(conn);
1342 if (!cmd)
1343 break;
1344
1345 isert_cmd = iscsit_priv_cmd(cmd);
1346 isert_cmd->read_stag = read_stag;
1347 isert_cmd->read_va = read_va;
1348 isert_cmd->write_stag = write_stag;
1349 isert_cmd->write_va = write_va;
1350
1351 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1352 rx_desc, (unsigned char *)hdr);
1353 break;
1354 case ISCSI_OP_NOOP_OUT:
1355 cmd = isert_allocate_cmd(conn);
1356 if (!cmd)
1357 break;
1358
1359 isert_cmd = iscsit_priv_cmd(cmd);
1360 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1361 rx_desc, (unsigned char *)hdr);
1362 break;
1363 case ISCSI_OP_SCSI_DATA_OUT:
1364 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1365 (unsigned char *)hdr);
1366 break;
1367 case ISCSI_OP_SCSI_TMFUNC:
1368 cmd = isert_allocate_cmd(conn);
1369 if (!cmd)
1370 break;
1371
1372 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1373 (unsigned char *)hdr);
1374 break;
1375 case ISCSI_OP_LOGOUT:
1376 cmd = isert_allocate_cmd(conn);
1377 if (!cmd)
1378 break;
1379
1380 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1381 if (ret > 0)
1382 wait_for_completion_timeout(&conn->conn_logout_comp,
1383 SECONDS_FOR_LOGOUT_COMP *
1384 HZ);
1385 break;
1386 case ISCSI_OP_TEXT:
1387 cmd = isert_allocate_cmd(conn);
1388 if (!cmd)
1389 break;
1390
1391 isert_cmd = iscsit_priv_cmd(cmd);
1392 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1393 rx_desc, (struct iscsi_text *)hdr);
1394 break;
1395 default:
1396 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1397 dump_stack();
1398 break;
1399 }
1400
1401 return ret;
1402 }
1403
1404 static void
1405 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1406 {
1407 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1408 uint64_t read_va = 0, write_va = 0;
1409 uint32_t read_stag = 0, write_stag = 0;
1410 int rc;
1411
1412 switch (iser_hdr->flags & 0xF0) {
1413 case ISCSI_CTRL:
1414 if (iser_hdr->flags & ISER_RSV) {
1415 read_stag = be32_to_cpu(iser_hdr->read_stag);
1416 read_va = be64_to_cpu(iser_hdr->read_va);
1417 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1418 read_stag, (unsigned long long)read_va);
1419 }
1420 if (iser_hdr->flags & ISER_WSV) {
1421 write_stag = be32_to_cpu(iser_hdr->write_stag);
1422 write_va = be64_to_cpu(iser_hdr->write_va);
1423 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1424 write_stag, (unsigned long long)write_va);
1425 }
1426
1427 pr_debug("ISER ISCSI_CTRL PDU\n");
1428 break;
1429 case ISER_HELLO:
1430 pr_err("iSER Hello message\n");
1431 break;
1432 default:
1433 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1434 break;
1435 }
1436
1437 rc = isert_rx_opcode(isert_conn, rx_desc,
1438 read_stag, read_va, write_stag, write_va);
1439 }
1440
1441 static void
1442 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1443 unsigned long xfer_len)
1444 {
1445 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1446 struct iscsi_hdr *hdr;
1447 u64 rx_dma;
1448 int rx_buflen, outstanding;
1449
1450 if ((char *)desc == isert_conn->login_req_buf) {
1451 rx_dma = isert_conn->login_req_dma;
1452 rx_buflen = ISER_RX_LOGIN_SIZE;
1453 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1454 rx_dma, rx_buflen);
1455 } else {
1456 rx_dma = desc->dma_addr;
1457 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1458 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1459 rx_dma, rx_buflen);
1460 }
1461
1462 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1463
1464 hdr = &desc->iscsi_header;
1465 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1466 hdr->opcode, hdr->itt, hdr->flags,
1467 (int)(xfer_len - ISER_HEADERS_LEN));
1468
1469 if ((char *)desc == isert_conn->login_req_buf)
1470 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1471 isert_conn);
1472 else
1473 isert_rx_do_work(desc, isert_conn);
1474
1475 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1476 DMA_FROM_DEVICE);
1477
1478 isert_conn->post_recv_buf_count--;
1479 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1480 isert_conn->post_recv_buf_count);
1481
1482 if ((char *)desc == isert_conn->login_req_buf)
1483 return;
1484
1485 outstanding = isert_conn->post_recv_buf_count;
1486 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1487 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1488 ISERT_MIN_POSTED_RX);
1489 err = isert_post_recv(isert_conn, count);
1490 if (err) {
1491 pr_err("isert_post_recv() count: %d failed, %d\n",
1492 count, err);
1493 }
1494 }
1495 }
1496
1497 static int
1498 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1499 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1500 enum iser_ib_op_code op, struct isert_data_buf *data)
1501 {
1502 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1503
1504 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1505 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1506
1507 data->len = length - offset;
1508 data->offset = offset;
1509 data->sg_off = data->offset / PAGE_SIZE;
1510
1511 data->sg = &sg[data->sg_off];
1512 data->nents = min_t(unsigned int, nents - data->sg_off,
1513 ISCSI_ISER_SG_TABLESIZE);
1514 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1515 PAGE_SIZE);
1516
1517 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1518 data->dma_dir);
1519 if (unlikely(!data->dma_nents)) {
1520 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1521 return -EINVAL;
1522 }
1523
1524 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1525 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1526
1527 return 0;
1528 }
1529
1530 static void
1531 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1532 {
1533 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1534
1535 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1536 memset(data, 0, sizeof(*data));
1537 }
1538
1539
1540
1541 static void
1542 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1543 {
1544 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1545
1546 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1547
1548 if (wr->data.sg) {
1549 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1550 isert_unmap_data_buf(isert_conn, &wr->data);
1551 }
1552
1553 if (wr->send_wr) {
1554 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1555 kfree(wr->send_wr);
1556 wr->send_wr = NULL;
1557 }
1558
1559 if (wr->ib_sge) {
1560 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1561 kfree(wr->ib_sge);
1562 wr->ib_sge = NULL;
1563 }
1564 }
1565
1566 static void
1567 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1568 {
1569 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1570 LIST_HEAD(unmap_list);
1571
1572 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1573
1574 if (wr->fr_desc) {
1575 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1576 isert_cmd, wr->fr_desc);
1577 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1578 isert_unmap_data_buf(isert_conn, &wr->prot);
1579 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1580 }
1581 spin_lock_bh(&isert_conn->conn_lock);
1582 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1583 spin_unlock_bh(&isert_conn->conn_lock);
1584 wr->fr_desc = NULL;
1585 }
1586
1587 if (wr->data.sg) {
1588 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1589 isert_unmap_data_buf(isert_conn, &wr->data);
1590 }
1591
1592 wr->ib_sge = NULL;
1593 wr->send_wr = NULL;
1594 }
1595
1596 static void
1597 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1598 {
1599 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1600 struct isert_conn *isert_conn = isert_cmd->conn;
1601 struct iscsi_conn *conn = isert_conn->conn;
1602 struct isert_device *device = isert_conn->conn_device;
1603
1604 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1605
1606 switch (cmd->iscsi_opcode) {
1607 case ISCSI_OP_SCSI_CMD:
1608 spin_lock_bh(&conn->cmd_lock);
1609 if (!list_empty(&cmd->i_conn_node))
1610 list_del_init(&cmd->i_conn_node);
1611 spin_unlock_bh(&conn->cmd_lock);
1612
1613 if (cmd->data_direction == DMA_TO_DEVICE) {
1614 iscsit_stop_dataout_timer(cmd);
1615 /*
1616 * Check for special case during comp_err where
1617 * WRITE_PENDING has been handed off from core,
1618 * but requires an extra target_put_sess_cmd()
1619 * before transport_generic_free_cmd() below.
1620 */
1621 if (comp_err &&
1622 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1623 struct se_cmd *se_cmd = &cmd->se_cmd;
1624
1625 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1626 }
1627 }
1628
1629 device->unreg_rdma_mem(isert_cmd, isert_conn);
1630 transport_generic_free_cmd(&cmd->se_cmd, 0);
1631 break;
1632 case ISCSI_OP_SCSI_TMFUNC:
1633 spin_lock_bh(&conn->cmd_lock);
1634 if (!list_empty(&cmd->i_conn_node))
1635 list_del_init(&cmd->i_conn_node);
1636 spin_unlock_bh(&conn->cmd_lock);
1637
1638 transport_generic_free_cmd(&cmd->se_cmd, 0);
1639 break;
1640 case ISCSI_OP_REJECT:
1641 case ISCSI_OP_NOOP_OUT:
1642 case ISCSI_OP_TEXT:
1643 spin_lock_bh(&conn->cmd_lock);
1644 if (!list_empty(&cmd->i_conn_node))
1645 list_del_init(&cmd->i_conn_node);
1646 spin_unlock_bh(&conn->cmd_lock);
1647
1648 /*
1649 * Handle special case for REJECT when iscsi_add_reject*() has
1650 * overwritten the original iscsi_opcode assignment, and the
1651 * associated cmd->se_cmd needs to be released.
1652 */
1653 if (cmd->se_cmd.se_tfo != NULL) {
1654 pr_debug("Calling transport_generic_free_cmd from"
1655 " isert_put_cmd for 0x%02x\n",
1656 cmd->iscsi_opcode);
1657 transport_generic_free_cmd(&cmd->se_cmd, 0);
1658 break;
1659 }
1660 /*
1661 * Fall-through
1662 */
1663 default:
1664 iscsit_release_cmd(cmd);
1665 break;
1666 }
1667 }
1668
1669 static void
1670 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1671 {
1672 if (tx_desc->dma_addr != 0) {
1673 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1674 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1675 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1676 tx_desc->dma_addr = 0;
1677 }
1678 }
1679
1680 static void
1681 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1682 struct ib_device *ib_dev, bool comp_err)
1683 {
1684 if (isert_cmd->pdu_buf_dma != 0) {
1685 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1686 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1687 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1688 isert_cmd->pdu_buf_dma = 0;
1689 }
1690
1691 isert_unmap_tx_desc(tx_desc, ib_dev);
1692 isert_put_cmd(isert_cmd, comp_err);
1693 }
1694
1695 static int
1696 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1697 {
1698 struct ib_mr_status mr_status;
1699 int ret;
1700
1701 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1702 if (ret) {
1703 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1704 goto fail_mr_status;
1705 }
1706
1707 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1708 u64 sec_offset_err;
1709 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1710
1711 switch (mr_status.sig_err.err_type) {
1712 case IB_SIG_BAD_GUARD:
1713 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1714 break;
1715 case IB_SIG_BAD_REFTAG:
1716 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1717 break;
1718 case IB_SIG_BAD_APPTAG:
1719 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1720 break;
1721 }
1722 sec_offset_err = mr_status.sig_err.sig_err_offset;
1723 do_div(sec_offset_err, block_size);
1724 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1725
1726 pr_err("isert: PI error found type %d at sector 0x%llx "
1727 "expected 0x%x vs actual 0x%x\n",
1728 mr_status.sig_err.err_type,
1729 (unsigned long long)se_cmd->bad_sector,
1730 mr_status.sig_err.expected,
1731 mr_status.sig_err.actual);
1732 ret = 1;
1733 }
1734
1735 fail_mr_status:
1736 return ret;
1737 }
1738
1739 static void
1740 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1741 struct isert_cmd *isert_cmd)
1742 {
1743 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1744 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1745 struct se_cmd *se_cmd = &cmd->se_cmd;
1746 struct isert_conn *isert_conn = isert_cmd->conn;
1747 struct isert_device *device = isert_conn->conn_device;
1748 int ret = 0;
1749
1750 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1751 ret = isert_check_pi_status(se_cmd,
1752 wr->fr_desc->pi_ctx->sig_mr);
1753 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1754 }
1755
1756 device->unreg_rdma_mem(isert_cmd, isert_conn);
1757 wr->send_wr_num = 0;
1758 if (ret)
1759 transport_send_check_condition_and_sense(se_cmd,
1760 se_cmd->pi_err, 0);
1761 else
1762 isert_put_response(isert_conn->conn, cmd);
1763 }
1764
1765 static void
1766 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1767 struct isert_cmd *isert_cmd)
1768 {
1769 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1770 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1771 struct se_cmd *se_cmd = &cmd->se_cmd;
1772 struct isert_conn *isert_conn = isert_cmd->conn;
1773 struct isert_device *device = isert_conn->conn_device;
1774 int ret = 0;
1775
1776 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1777 ret = isert_check_pi_status(se_cmd,
1778 wr->fr_desc->pi_ctx->sig_mr);
1779 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1780 }
1781
1782 iscsit_stop_dataout_timer(cmd);
1783 device->unreg_rdma_mem(isert_cmd, isert_conn);
1784 cmd->write_data_done = wr->data.len;
1785 wr->send_wr_num = 0;
1786
1787 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1788 spin_lock_bh(&cmd->istate_lock);
1789 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1790 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1791 spin_unlock_bh(&cmd->istate_lock);
1792
1793 if (ret)
1794 transport_send_check_condition_and_sense(se_cmd,
1795 se_cmd->pi_err, 0);
1796 else
1797 target_execute_cmd(se_cmd);
1798 }
1799
1800 static void
1801 isert_do_control_comp(struct work_struct *work)
1802 {
1803 struct isert_cmd *isert_cmd = container_of(work,
1804 struct isert_cmd, comp_work);
1805 struct isert_conn *isert_conn = isert_cmd->conn;
1806 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1807 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1808
1809 switch (cmd->i_state) {
1810 case ISTATE_SEND_TASKMGTRSP:
1811 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1812
1813 atomic_dec(&isert_conn->post_send_buf_count);
1814 iscsit_tmr_post_handler(cmd, cmd->conn);
1815
1816 cmd->i_state = ISTATE_SENT_STATUS;
1817 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1818 break;
1819 case ISTATE_SEND_REJECT:
1820 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1821 atomic_dec(&isert_conn->post_send_buf_count);
1822
1823 cmd->i_state = ISTATE_SENT_STATUS;
1824 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1825 break;
1826 case ISTATE_SEND_LOGOUTRSP:
1827 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1828
1829 atomic_dec(&isert_conn->post_send_buf_count);
1830 iscsit_logout_post_handler(cmd, cmd->conn);
1831 break;
1832 case ISTATE_SEND_TEXTRSP:
1833 atomic_dec(&isert_conn->post_send_buf_count);
1834 cmd->i_state = ISTATE_SENT_STATUS;
1835 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
1836 break;
1837 default:
1838 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1839 dump_stack();
1840 break;
1841 }
1842 }
1843
1844 static void
1845 isert_response_completion(struct iser_tx_desc *tx_desc,
1846 struct isert_cmd *isert_cmd,
1847 struct isert_conn *isert_conn,
1848 struct ib_device *ib_dev)
1849 {
1850 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1851 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1852
1853 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1854 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1855 cmd->i_state == ISTATE_SEND_REJECT ||
1856 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1857 isert_unmap_tx_desc(tx_desc, ib_dev);
1858
1859 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1860 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1861 return;
1862 }
1863
1864 /**
1865 * If send_wr_num is 0 this means that we got
1866 * RDMA completion and we cleared it and we should
1867 * simply decrement the response post. else the
1868 * response is incorporated in send_wr_num, just
1869 * sub it.
1870 **/
1871 if (wr->send_wr_num)
1872 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1873 else
1874 atomic_dec(&isert_conn->post_send_buf_count);
1875
1876 cmd->i_state = ISTATE_SENT_STATUS;
1877 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1878 }
1879
1880 static void
1881 __isert_send_completion(struct iser_tx_desc *tx_desc,
1882 struct isert_conn *isert_conn)
1883 {
1884 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1885 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1886 struct isert_rdma_wr *wr;
1887
1888 if (!isert_cmd) {
1889 atomic_dec(&isert_conn->post_send_buf_count);
1890 isert_unmap_tx_desc(tx_desc, ib_dev);
1891 return;
1892 }
1893 wr = &isert_cmd->rdma_wr;
1894
1895 switch (wr->iser_ib_op) {
1896 case ISER_IB_RECV:
1897 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1898 dump_stack();
1899 break;
1900 case ISER_IB_SEND:
1901 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1902 isert_response_completion(tx_desc, isert_cmd,
1903 isert_conn, ib_dev);
1904 break;
1905 case ISER_IB_RDMA_WRITE:
1906 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1907 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1908 isert_completion_rdma_write(tx_desc, isert_cmd);
1909 break;
1910 case ISER_IB_RDMA_READ:
1911 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1912
1913 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1914 isert_completion_rdma_read(tx_desc, isert_cmd);
1915 break;
1916 default:
1917 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1918 dump_stack();
1919 break;
1920 }
1921 }
1922
1923 static void
1924 isert_send_completion(struct iser_tx_desc *tx_desc,
1925 struct isert_conn *isert_conn)
1926 {
1927 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1928 struct iser_tx_desc *t;
1929 /*
1930 * Drain coalesced completion llist starting from comp_llnode_batch
1931 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1932 */
1933 while (llnode) {
1934 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1935 llnode = llist_next(llnode);
1936 __isert_send_completion(t, isert_conn);
1937 }
1938 __isert_send_completion(tx_desc, isert_conn);
1939 }
1940
1941 static void
1942 isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1943 {
1944 struct llist_node *llnode;
1945 struct isert_rdma_wr *wr;
1946 struct iser_tx_desc *t;
1947
1948 mutex_lock(&isert_conn->conn_mutex);
1949 llnode = llist_del_all(&isert_conn->conn_comp_llist);
1950 isert_conn->conn_comp_batch = 0;
1951 mutex_unlock(&isert_conn->conn_mutex);
1952
1953 while (llnode) {
1954 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1955 llnode = llist_next(llnode);
1956 wr = &t->isert_cmd->rdma_wr;
1957
1958 /**
1959 * If send_wr_num is 0 this means that we got
1960 * RDMA completion and we cleared it and we should
1961 * simply decrement the response post. else the
1962 * response is incorporated in send_wr_num, just
1963 * sub it.
1964 **/
1965 if (wr->send_wr_num)
1966 atomic_sub(wr->send_wr_num,
1967 &isert_conn->post_send_buf_count);
1968 else
1969 atomic_dec(&isert_conn->post_send_buf_count);
1970
1971 isert_completion_put(t, t->isert_cmd, ib_dev, true);
1972 }
1973 }
1974
1975 static void
1976 isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1977 {
1978 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1979 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1980 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1981 struct isert_rdma_wr *wr;
1982 struct iser_tx_desc *t;
1983
1984 while (llnode) {
1985 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1986 llnode = llist_next(llnode);
1987 wr = &t->isert_cmd->rdma_wr;
1988
1989 /**
1990 * If send_wr_num is 0 this means that we got
1991 * RDMA completion and we cleared it and we should
1992 * simply decrement the response post. else the
1993 * response is incorporated in send_wr_num, just
1994 * sub it.
1995 **/
1996 if (wr->send_wr_num)
1997 atomic_sub(wr->send_wr_num,
1998 &isert_conn->post_send_buf_count);
1999 else
2000 atomic_dec(&isert_conn->post_send_buf_count);
2001
2002 isert_completion_put(t, t->isert_cmd, ib_dev, true);
2003 }
2004 tx_desc->comp_llnode_batch = NULL;
2005
2006 if (!isert_cmd)
2007 isert_unmap_tx_desc(tx_desc, ib_dev);
2008 else
2009 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2010 }
2011
2012 static void
2013 isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2014 {
2015 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2016 struct iscsi_conn *conn = isert_conn->conn;
2017
2018 if (isert_conn->post_recv_buf_count)
2019 return;
2020
2021 isert_cq_drain_comp_llist(isert_conn, ib_dev);
2022
2023 if (conn->sess) {
2024 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2025 target_wait_for_sess_cmds(conn->sess->se_sess);
2026 }
2027
2028 while (atomic_read(&isert_conn->post_send_buf_count))
2029 msleep(3000);
2030
2031 mutex_lock(&isert_conn->conn_mutex);
2032 isert_conn->state = ISER_CONN_DOWN;
2033 mutex_unlock(&isert_conn->conn_mutex);
2034
2035 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2036
2037 complete(&isert_conn->conn_wait_comp_err);
2038 }
2039
2040 static void
2041 isert_cq_tx_work(struct work_struct *work)
2042 {
2043 struct isert_cq_desc *cq_desc = container_of(work,
2044 struct isert_cq_desc, cq_tx_work);
2045 struct isert_device *device = cq_desc->device;
2046 int cq_index = cq_desc->cq_index;
2047 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2048 struct isert_conn *isert_conn;
2049 struct iser_tx_desc *tx_desc;
2050 struct ib_wc wc;
2051
2052 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2053 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2054 isert_conn = wc.qp->qp_context;
2055
2056 if (wc.status == IB_WC_SUCCESS) {
2057 isert_send_completion(tx_desc, isert_conn);
2058 } else {
2059 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2060 pr_debug("TX wc.status: 0x%08x\n", wc.status);
2061 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
2062
2063 if (wc.wr_id != ISER_FASTREG_LI_WRID) {
2064 if (tx_desc->llnode_active)
2065 continue;
2066
2067 atomic_dec(&isert_conn->post_send_buf_count);
2068 isert_cq_tx_comp_err(tx_desc, isert_conn);
2069 }
2070 }
2071 }
2072
2073 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2074 }
2075
2076 static void
2077 isert_cq_tx_callback(struct ib_cq *cq, void *context)
2078 {
2079 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2080
2081 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2082 }
2083
2084 static void
2085 isert_cq_rx_work(struct work_struct *work)
2086 {
2087 struct isert_cq_desc *cq_desc = container_of(work,
2088 struct isert_cq_desc, cq_rx_work);
2089 struct isert_device *device = cq_desc->device;
2090 int cq_index = cq_desc->cq_index;
2091 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2092 struct isert_conn *isert_conn;
2093 struct iser_rx_desc *rx_desc;
2094 struct ib_wc wc;
2095 unsigned long xfer_len;
2096
2097 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2098 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2099 isert_conn = wc.qp->qp_context;
2100
2101 if (wc.status == IB_WC_SUCCESS) {
2102 xfer_len = (unsigned long)wc.byte_len;
2103 isert_rx_completion(rx_desc, isert_conn, xfer_len);
2104 } else {
2105 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2106 if (wc.status != IB_WC_WR_FLUSH_ERR) {
2107 pr_debug("RX wc.status: 0x%08x\n", wc.status);
2108 pr_debug("RX wc.vendor_err: 0x%08x\n",
2109 wc.vendor_err);
2110 }
2111 isert_conn->post_recv_buf_count--;
2112 isert_cq_rx_comp_err(isert_conn);
2113 }
2114 }
2115
2116 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2117 }
2118
2119 static void
2120 isert_cq_rx_callback(struct ib_cq *cq, void *context)
2121 {
2122 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2123
2124 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2125 }
2126
2127 static int
2128 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2129 {
2130 struct ib_send_wr *wr_failed;
2131 int ret;
2132
2133 atomic_inc(&isert_conn->post_send_buf_count);
2134
2135 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2136 &wr_failed);
2137 if (ret) {
2138 pr_err("ib_post_send failed with %d\n", ret);
2139 atomic_dec(&isert_conn->post_send_buf_count);
2140 return ret;
2141 }
2142 return ret;
2143 }
2144
2145 static int
2146 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2147 {
2148 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2149 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2150 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2151 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2152 &isert_cmd->tx_desc.iscsi_header;
2153
2154 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2155 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2156 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2157 /*
2158 * Attach SENSE DATA payload to iSCSI Response PDU
2159 */
2160 if (cmd->se_cmd.sense_buffer &&
2161 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2162 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2163 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2164 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2165 u32 padding, pdu_len;
2166
2167 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2168 cmd->sense_buffer);
2169 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2170
2171 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2172 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2173 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2174
2175 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2176 (void *)cmd->sense_buffer, pdu_len,
2177 DMA_TO_DEVICE);
2178
2179 isert_cmd->pdu_buf_len = pdu_len;
2180 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2181 tx_dsg->length = pdu_len;
2182 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2183 isert_cmd->tx_desc.num_sge = 2;
2184 }
2185
2186 isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
2187
2188 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2189
2190 return isert_post_response(isert_conn, isert_cmd);
2191 }
2192
2193 static void
2194 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2195 {
2196 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2197 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2198 struct isert_device *device = isert_conn->conn_device;
2199
2200 spin_lock_bh(&conn->cmd_lock);
2201 if (!list_empty(&cmd->i_conn_node))
2202 list_del_init(&cmd->i_conn_node);
2203 spin_unlock_bh(&conn->cmd_lock);
2204
2205 if (cmd->data_direction == DMA_TO_DEVICE)
2206 iscsit_stop_dataout_timer(cmd);
2207
2208 device->unreg_rdma_mem(isert_cmd, isert_conn);
2209 }
2210
2211 static enum target_prot_op
2212 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2213 {
2214 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2215 struct isert_device *device = isert_conn->conn_device;
2216
2217 if (device->pi_capable)
2218 return TARGET_PROT_ALL;
2219
2220 return TARGET_PROT_NORMAL;
2221 }
2222
2223 static int
2224 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2225 bool nopout_response)
2226 {
2227 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2228 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2229 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2230
2231 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2232 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2233 &isert_cmd->tx_desc.iscsi_header,
2234 nopout_response);
2235 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2236 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2237
2238 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2239
2240 return isert_post_response(isert_conn, isert_cmd);
2241 }
2242
2243 static int
2244 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2245 {
2246 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2247 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2248 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2249
2250 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2251 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2252 &isert_cmd->tx_desc.iscsi_header);
2253 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2254 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2255
2256 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2257
2258 return isert_post_response(isert_conn, isert_cmd);
2259 }
2260
2261 static int
2262 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2263 {
2264 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2265 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2266 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2267
2268 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2269 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2270 &isert_cmd->tx_desc.iscsi_header);
2271 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2272 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2273
2274 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2275
2276 return isert_post_response(isert_conn, isert_cmd);
2277 }
2278
2279 static int
2280 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2281 {
2282 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2283 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2284 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2285 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2286 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2287 struct iscsi_reject *hdr =
2288 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2289
2290 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2291 iscsit_build_reject(cmd, conn, hdr);
2292 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2293
2294 hton24(hdr->dlength, ISCSI_HDR_LEN);
2295 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2296 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2297 DMA_TO_DEVICE);
2298 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2299 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2300 tx_dsg->length = ISCSI_HDR_LEN;
2301 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2302 isert_cmd->tx_desc.num_sge = 2;
2303
2304 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2305
2306 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2307
2308 return isert_post_response(isert_conn, isert_cmd);
2309 }
2310
2311 static int
2312 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2313 {
2314 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2315 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2316 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2317 struct iscsi_text_rsp *hdr =
2318 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2319 u32 txt_rsp_len;
2320 int rc;
2321
2322 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2323 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2324 if (rc < 0)
2325 return rc;
2326
2327 txt_rsp_len = rc;
2328 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2329
2330 if (txt_rsp_len) {
2331 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2332 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2333 void *txt_rsp_buf = cmd->buf_ptr;
2334
2335 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2336 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2337
2338 isert_cmd->pdu_buf_len = txt_rsp_len;
2339 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2340 tx_dsg->length = txt_rsp_len;
2341 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2342 isert_cmd->tx_desc.num_sge = 2;
2343 }
2344 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
2345
2346 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2347
2348 return isert_post_response(isert_conn, isert_cmd);
2349 }
2350
2351 static int
2352 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2353 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2354 u32 data_left, u32 offset)
2355 {
2356 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2357 struct scatterlist *sg_start, *tmp_sg;
2358 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2359 u32 sg_off, page_off;
2360 int i = 0, sg_nents;
2361
2362 sg_off = offset / PAGE_SIZE;
2363 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2364 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2365 page_off = offset % PAGE_SIZE;
2366
2367 send_wr->sg_list = ib_sge;
2368 send_wr->num_sge = sg_nents;
2369 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2370 /*
2371 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2372 */
2373 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2374 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2375 (unsigned long long)tmp_sg->dma_address,
2376 tmp_sg->length, page_off);
2377
2378 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2379 ib_sge->length = min_t(u32, data_left,
2380 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2381 ib_sge->lkey = isert_conn->conn_mr->lkey;
2382
2383 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2384 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2385 page_off = 0;
2386 data_left -= ib_sge->length;
2387 ib_sge++;
2388 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2389 }
2390
2391 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2392 send_wr->sg_list, send_wr->num_sge);
2393
2394 return sg_nents;
2395 }
2396
2397 static int
2398 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2399 struct isert_rdma_wr *wr)
2400 {
2401 struct se_cmd *se_cmd = &cmd->se_cmd;
2402 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2403 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2404 struct isert_data_buf *data = &wr->data;
2405 struct ib_send_wr *send_wr;
2406 struct ib_sge *ib_sge;
2407 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2408 int ret = 0, i, ib_sge_cnt;
2409
2410 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2411
2412 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2413 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2414 se_cmd->t_data_nents, se_cmd->data_length,
2415 offset, wr->iser_ib_op, &wr->data);
2416 if (ret)
2417 return ret;
2418
2419 data_left = data->len;
2420 offset = data->offset;
2421
2422 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2423 if (!ib_sge) {
2424 pr_warn("Unable to allocate ib_sge\n");
2425 ret = -ENOMEM;
2426 goto unmap_cmd;
2427 }
2428 wr->ib_sge = ib_sge;
2429
2430 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2431 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2432 GFP_KERNEL);
2433 if (!wr->send_wr) {
2434 pr_debug("Unable to allocate wr->send_wr\n");
2435 ret = -ENOMEM;
2436 goto unmap_cmd;
2437 }
2438
2439 wr->isert_cmd = isert_cmd;
2440 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2441
2442 for (i = 0; i < wr->send_wr_num; i++) {
2443 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2444 data_len = min(data_left, rdma_write_max);
2445
2446 send_wr->send_flags = 0;
2447 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2448 send_wr->opcode = IB_WR_RDMA_WRITE;
2449 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2450 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2451 if (i + 1 == wr->send_wr_num)
2452 send_wr->next = &isert_cmd->tx_desc.send_wr;
2453 else
2454 send_wr->next = &wr->send_wr[i + 1];
2455 } else {
2456 send_wr->opcode = IB_WR_RDMA_READ;
2457 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2458 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2459 if (i + 1 == wr->send_wr_num)
2460 send_wr->send_flags = IB_SEND_SIGNALED;
2461 else
2462 send_wr->next = &wr->send_wr[i + 1];
2463 }
2464
2465 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2466 send_wr, data_len, offset);
2467 ib_sge += ib_sge_cnt;
2468
2469 offset += data_len;
2470 va_offset += data_len;
2471 data_left -= data_len;
2472 }
2473
2474 return 0;
2475 unmap_cmd:
2476 isert_unmap_data_buf(isert_conn, data);
2477
2478 return ret;
2479 }
2480
2481 static int
2482 isert_map_fr_pagelist(struct ib_device *ib_dev,
2483 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2484 {
2485 u64 start_addr, end_addr, page, chunk_start = 0;
2486 struct scatterlist *tmp_sg;
2487 int i = 0, new_chunk, last_ent, n_pages;
2488
2489 n_pages = 0;
2490 new_chunk = 1;
2491 last_ent = sg_nents - 1;
2492 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2493 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2494 if (new_chunk)
2495 chunk_start = start_addr;
2496 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2497
2498 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2499 i, (unsigned long long)tmp_sg->dma_address,
2500 tmp_sg->length);
2501
2502 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2503 new_chunk = 0;
2504 continue;
2505 }
2506 new_chunk = 1;
2507
2508 page = chunk_start & PAGE_MASK;
2509 do {
2510 fr_pl[n_pages++] = page;
2511 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2512 n_pages - 1, page);
2513 page += PAGE_SIZE;
2514 } while (page < end_addr);
2515 }
2516
2517 return n_pages;
2518 }
2519
2520 static int
2521 isert_fast_reg_mr(struct isert_conn *isert_conn,
2522 struct fast_reg_descriptor *fr_desc,
2523 struct isert_data_buf *mem,
2524 enum isert_indicator ind,
2525 struct ib_sge *sge)
2526 {
2527 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2528 struct ib_mr *mr;
2529 struct ib_fast_reg_page_list *frpl;
2530 struct ib_send_wr fr_wr, inv_wr;
2531 struct ib_send_wr *bad_wr, *wr = NULL;
2532 int ret, pagelist_len;
2533 u32 page_off;
2534 u8 key;
2535
2536 if (mem->dma_nents == 1) {
2537 sge->lkey = isert_conn->conn_mr->lkey;
2538 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2539 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2540 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2541 __func__, __LINE__, sge->addr, sge->length,
2542 sge->lkey);
2543 return 0;
2544 }
2545
2546 if (ind == ISERT_DATA_KEY_VALID) {
2547 /* Registering data buffer */
2548 mr = fr_desc->data_mr;
2549 frpl = fr_desc->data_frpl;
2550 } else {
2551 /* Registering protection buffer */
2552 mr = fr_desc->pi_ctx->prot_mr;
2553 frpl = fr_desc->pi_ctx->prot_frpl;
2554 }
2555
2556 page_off = mem->offset % PAGE_SIZE;
2557
2558 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2559 fr_desc, mem->nents, mem->offset);
2560
2561 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2562 &frpl->page_list[0]);
2563
2564 if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
2565 memset(&inv_wr, 0, sizeof(inv_wr));
2566 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2567 inv_wr.opcode = IB_WR_LOCAL_INV;
2568 inv_wr.ex.invalidate_rkey = mr->rkey;
2569 wr = &inv_wr;
2570 /* Bump the key */
2571 key = (u8)(mr->rkey & 0x000000FF);
2572 ib_update_fast_reg_key(mr, ++key);
2573 }
2574
2575 /* Prepare FASTREG WR */
2576 memset(&fr_wr, 0, sizeof(fr_wr));
2577 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2578 fr_wr.opcode = IB_WR_FAST_REG_MR;
2579 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2580 fr_wr.wr.fast_reg.page_list = frpl;
2581 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2582 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2583 fr_wr.wr.fast_reg.length = mem->len;
2584 fr_wr.wr.fast_reg.rkey = mr->rkey;
2585 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2586
2587 if (!wr)
2588 wr = &fr_wr;
2589 else
2590 wr->next = &fr_wr;
2591
2592 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2593 if (ret) {
2594 pr_err("fast registration failed, ret:%d\n", ret);
2595 return ret;
2596 }
2597 fr_desc->ind &= ~ind;
2598
2599 sge->lkey = mr->lkey;
2600 sge->addr = frpl->page_list[0] + page_off;
2601 sge->length = mem->len;
2602
2603 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2604 __func__, __LINE__, sge->addr, sge->length,
2605 sge->lkey);
2606
2607 return ret;
2608 }
2609
2610 static inline enum ib_t10_dif_type
2611 se2ib_prot_type(enum target_prot_type prot_type)
2612 {
2613 switch (prot_type) {
2614 case TARGET_DIF_TYPE0_PROT:
2615 return IB_T10DIF_NONE;
2616 case TARGET_DIF_TYPE1_PROT:
2617 return IB_T10DIF_TYPE1;
2618 case TARGET_DIF_TYPE2_PROT:
2619 return IB_T10DIF_TYPE2;
2620 case TARGET_DIF_TYPE3_PROT:
2621 return IB_T10DIF_TYPE3;
2622 default:
2623 return IB_T10DIF_NONE;
2624 }
2625 }
2626
2627 static int
2628 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2629 {
2630 enum ib_t10_dif_type ib_prot_type = se2ib_prot_type(se_cmd->prot_type);
2631
2632 sig_attrs->mem.sig_type = IB_SIG_TYPE_T10_DIF;
2633 sig_attrs->wire.sig_type = IB_SIG_TYPE_T10_DIF;
2634 sig_attrs->mem.sig.dif.pi_interval =
2635 se_cmd->se_dev->dev_attrib.block_size;
2636 sig_attrs->wire.sig.dif.pi_interval =
2637 se_cmd->se_dev->dev_attrib.block_size;
2638
2639 switch (se_cmd->prot_op) {
2640 case TARGET_PROT_DIN_INSERT:
2641 case TARGET_PROT_DOUT_STRIP:
2642 sig_attrs->mem.sig.dif.type = IB_T10DIF_NONE;
2643 sig_attrs->wire.sig.dif.type = ib_prot_type;
2644 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2645 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2646 break;
2647 case TARGET_PROT_DOUT_INSERT:
2648 case TARGET_PROT_DIN_STRIP:
2649 sig_attrs->mem.sig.dif.type = ib_prot_type;
2650 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2651 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2652 sig_attrs->wire.sig.dif.type = IB_T10DIF_NONE;
2653 break;
2654 case TARGET_PROT_DIN_PASS:
2655 case TARGET_PROT_DOUT_PASS:
2656 sig_attrs->mem.sig.dif.type = ib_prot_type;
2657 sig_attrs->mem.sig.dif.bg_type = IB_T10DIF_CRC;
2658 sig_attrs->mem.sig.dif.ref_tag = se_cmd->reftag_seed;
2659 sig_attrs->wire.sig.dif.type = ib_prot_type;
2660 sig_attrs->wire.sig.dif.bg_type = IB_T10DIF_CRC;
2661 sig_attrs->wire.sig.dif.ref_tag = se_cmd->reftag_seed;
2662 break;
2663 default:
2664 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2665 return -EINVAL;
2666 }
2667
2668 return 0;
2669 }
2670
2671 static inline u8
2672 isert_set_prot_checks(u8 prot_checks)
2673 {
2674 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2675 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2676 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2677 }
2678
2679 static int
2680 isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2681 struct fast_reg_descriptor *fr_desc,
2682 struct ib_sge *data_sge, struct ib_sge *prot_sge,
2683 struct ib_sge *sig_sge)
2684 {
2685 struct ib_send_wr sig_wr, inv_wr;
2686 struct ib_send_wr *bad_wr, *wr = NULL;
2687 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2688 struct ib_sig_attrs sig_attrs;
2689 int ret;
2690 u32 key;
2691
2692 memset(&sig_attrs, 0, sizeof(sig_attrs));
2693 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2694 if (ret)
2695 goto err;
2696
2697 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2698
2699 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2700 memset(&inv_wr, 0, sizeof(inv_wr));
2701 inv_wr.opcode = IB_WR_LOCAL_INV;
2702 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
2703 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2704 wr = &inv_wr;
2705 /* Bump the key */
2706 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2707 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2708 }
2709
2710 memset(&sig_wr, 0, sizeof(sig_wr));
2711 sig_wr.opcode = IB_WR_REG_SIG_MR;
2712 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2713 sig_wr.sg_list = data_sge;
2714 sig_wr.num_sge = 1;
2715 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2716 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2717 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2718 if (se_cmd->t_prot_sg)
2719 sig_wr.wr.sig_handover.prot = prot_sge;
2720
2721 if (!wr)
2722 wr = &sig_wr;
2723 else
2724 wr->next = &sig_wr;
2725
2726 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2727 if (ret) {
2728 pr_err("fast registration failed, ret:%d\n", ret);
2729 goto err;
2730 }
2731 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2732
2733 sig_sge->lkey = pi_ctx->sig_mr->lkey;
2734 sig_sge->addr = 0;
2735 sig_sge->length = se_cmd->data_length;
2736 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2737 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2738 /*
2739 * We have protection guards on the wire
2740 * so we need to set a larget transfer
2741 */
2742 sig_sge->length += se_cmd->prot_length;
2743
2744 pr_debug("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2745 sig_sge->addr, sig_sge->length,
2746 sig_sge->lkey);
2747 err:
2748 return ret;
2749 }
2750
2751 static int
2752 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2753 struct isert_rdma_wr *wr)
2754 {
2755 struct se_cmd *se_cmd = &cmd->se_cmd;
2756 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2757 struct isert_conn *isert_conn = conn->context;
2758 struct ib_sge data_sge;
2759 struct ib_send_wr *send_wr;
2760 struct fast_reg_descriptor *fr_desc = NULL;
2761 u32 offset;
2762 int ret = 0;
2763 unsigned long flags;
2764
2765 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2766
2767 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2768 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2769 se_cmd->t_data_nents, se_cmd->data_length,
2770 offset, wr->iser_ib_op, &wr->data);
2771 if (ret)
2772 return ret;
2773
2774 if (wr->data.dma_nents != 1 ||
2775 se_cmd->prot_op != TARGET_PROT_NORMAL) {
2776 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2777 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2778 struct fast_reg_descriptor, list);
2779 list_del(&fr_desc->list);
2780 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2781 wr->fr_desc = fr_desc;
2782 }
2783
2784 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2785 ISERT_DATA_KEY_VALID, &data_sge);
2786 if (ret)
2787 goto unmap_cmd;
2788
2789 if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2790 struct ib_sge prot_sge, sig_sge;
2791
2792 if (se_cmd->t_prot_sg) {
2793 ret = isert_map_data_buf(isert_conn, isert_cmd,
2794 se_cmd->t_prot_sg,
2795 se_cmd->t_prot_nents,
2796 se_cmd->prot_length,
2797 0, wr->iser_ib_op, &wr->prot);
2798 if (ret)
2799 goto unmap_cmd;
2800
2801 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2802 ISERT_PROT_KEY_VALID, &prot_sge);
2803 if (ret)
2804 goto unmap_prot_cmd;
2805 }
2806
2807 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2808 &data_sge, &prot_sge, &sig_sge);
2809 if (ret)
2810 goto unmap_prot_cmd;
2811
2812 fr_desc->ind |= ISERT_PROTECTED;
2813 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2814 } else
2815 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2816
2817 wr->ib_sge = &wr->s_ib_sge;
2818 wr->send_wr_num = 1;
2819 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2820 wr->send_wr = &wr->s_send_wr;
2821 wr->isert_cmd = isert_cmd;
2822
2823 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2824 send_wr->sg_list = &wr->s_ib_sge;
2825 send_wr->num_sge = 1;
2826 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2827 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2828 send_wr->opcode = IB_WR_RDMA_WRITE;
2829 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2830 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2831 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2832 0 : IB_SEND_SIGNALED;
2833 } else {
2834 send_wr->opcode = IB_WR_RDMA_READ;
2835 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2836 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2837 send_wr->send_flags = IB_SEND_SIGNALED;
2838 }
2839
2840 return 0;
2841 unmap_prot_cmd:
2842 if (se_cmd->t_prot_sg)
2843 isert_unmap_data_buf(isert_conn, &wr->prot);
2844 unmap_cmd:
2845 if (fr_desc) {
2846 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2847 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2848 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2849 }
2850 isert_unmap_data_buf(isert_conn, &wr->data);
2851
2852 return ret;
2853 }
2854
2855 static int
2856 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2857 {
2858 struct se_cmd *se_cmd = &cmd->se_cmd;
2859 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2860 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2861 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2862 struct isert_device *device = isert_conn->conn_device;
2863 struct ib_send_wr *wr_failed;
2864 int rc;
2865
2866 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2867 isert_cmd, se_cmd->data_length);
2868 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2869 rc = device->reg_rdma_mem(conn, cmd, wr);
2870 if (rc) {
2871 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2872 return rc;
2873 }
2874
2875 if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2876 /*
2877 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2878 */
2879 isert_create_send_desc(isert_conn, isert_cmd,
2880 &isert_cmd->tx_desc);
2881 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2882 &isert_cmd->tx_desc.iscsi_header);
2883 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2884 isert_init_send_wr(isert_conn, isert_cmd,
2885 &isert_cmd->tx_desc.send_wr, true);
2886 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2887 wr->send_wr_num += 1;
2888 }
2889
2890 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2891
2892 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2893 if (rc) {
2894 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2895 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2896 }
2897
2898 if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2899 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2900 "READ\n", isert_cmd);
2901 else
2902 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2903 isert_cmd);
2904
2905 return 1;
2906 }
2907
2908 static int
2909 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2910 {
2911 struct se_cmd *se_cmd = &cmd->se_cmd;
2912 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2913 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2914 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2915 struct isert_device *device = isert_conn->conn_device;
2916 struct ib_send_wr *wr_failed;
2917 int rc;
2918
2919 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2920 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2921 wr->iser_ib_op = ISER_IB_RDMA_READ;
2922 rc = device->reg_rdma_mem(conn, cmd, wr);
2923 if (rc) {
2924 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2925 return rc;
2926 }
2927
2928 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
2929
2930 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2931 if (rc) {
2932 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2933 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
2934 }
2935 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2936 isert_cmd);
2937
2938 return 0;
2939 }
2940
2941 static int
2942 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2943 {
2944 int ret;
2945
2946 switch (state) {
2947 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2948 ret = isert_put_nopin(cmd, conn, false);
2949 break;
2950 default:
2951 pr_err("Unknown immediate state: 0x%02x\n", state);
2952 ret = -EINVAL;
2953 break;
2954 }
2955
2956 return ret;
2957 }
2958
2959 static int
2960 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2961 {
2962 int ret;
2963
2964 switch (state) {
2965 case ISTATE_SEND_LOGOUTRSP:
2966 ret = isert_put_logout_rsp(cmd, conn);
2967 if (!ret) {
2968 pr_debug("Returning iSER Logout -EAGAIN\n");
2969 ret = -EAGAIN;
2970 }
2971 break;
2972 case ISTATE_SEND_NOPIN:
2973 ret = isert_put_nopin(cmd, conn, true);
2974 break;
2975 case ISTATE_SEND_TASKMGTRSP:
2976 ret = isert_put_tm_rsp(cmd, conn);
2977 break;
2978 case ISTATE_SEND_REJECT:
2979 ret = isert_put_reject(cmd, conn);
2980 break;
2981 case ISTATE_SEND_TEXTRSP:
2982 ret = isert_put_text_rsp(cmd, conn);
2983 break;
2984 case ISTATE_SEND_STATUS:
2985 /*
2986 * Special case for sending non GOOD SCSI status from TX thread
2987 * context during pre se_cmd excecution failure.
2988 */
2989 ret = isert_put_response(conn, cmd);
2990 break;
2991 default:
2992 pr_err("Unknown response state: 0x%02x\n", state);
2993 ret = -EINVAL;
2994 break;
2995 }
2996
2997 return ret;
2998 }
2999
3000 static int
3001 isert_setup_np(struct iscsi_np *np,
3002 struct __kernel_sockaddr_storage *ksockaddr)
3003 {
3004 struct isert_np *isert_np;
3005 struct rdma_cm_id *isert_lid;
3006 struct sockaddr *sa;
3007 int ret;
3008
3009 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3010 if (!isert_np) {
3011 pr_err("Unable to allocate struct isert_np\n");
3012 return -ENOMEM;
3013 }
3014 sema_init(&isert_np->np_sem, 0);
3015 mutex_init(&isert_np->np_accept_mutex);
3016 INIT_LIST_HEAD(&isert_np->np_accept_list);
3017 init_completion(&isert_np->np_login_comp);
3018
3019 sa = (struct sockaddr *)ksockaddr;
3020 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3021 /*
3022 * Setup the np->np_sockaddr from the passed sockaddr setup
3023 * in iscsi_target_configfs.c code..
3024 */
3025 memcpy(&np->np_sockaddr, ksockaddr,
3026 sizeof(struct __kernel_sockaddr_storage));
3027
3028 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3029 IB_QPT_RC);
3030 if (IS_ERR(isert_lid)) {
3031 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3032 PTR_ERR(isert_lid));
3033 ret = PTR_ERR(isert_lid);
3034 goto out;
3035 }
3036
3037 ret = rdma_bind_addr(isert_lid, sa);
3038 if (ret) {
3039 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3040 goto out_lid;
3041 }
3042
3043 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3044 if (ret) {
3045 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3046 goto out_lid;
3047 }
3048
3049 isert_np->np_cm_id = isert_lid;
3050 np->np_context = isert_np;
3051 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3052
3053 return 0;
3054
3055 out_lid:
3056 rdma_destroy_id(isert_lid);
3057 out:
3058 kfree(isert_np);
3059 return ret;
3060 }
3061
3062 static int
3063 isert_rdma_accept(struct isert_conn *isert_conn)
3064 {
3065 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3066 struct rdma_conn_param cp;
3067 int ret;
3068
3069 memset(&cp, 0, sizeof(struct rdma_conn_param));
3070 cp.responder_resources = isert_conn->responder_resources;
3071 cp.initiator_depth = isert_conn->initiator_depth;
3072 cp.retry_count = 7;
3073 cp.rnr_retry_count = 7;
3074
3075 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3076
3077 ret = rdma_accept(cm_id, &cp);
3078 if (ret) {
3079 pr_err("rdma_accept() failed with: %d\n", ret);
3080 return ret;
3081 }
3082
3083 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3084
3085 return 0;
3086 }
3087
3088 static int
3089 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3090 {
3091 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3092 int ret;
3093
3094 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
3095 /*
3096 * For login requests after the first PDU, isert_rx_login_req() will
3097 * kick schedule_delayed_work(&conn->login_work) as the packet is
3098 * received, which turns this callback from iscsi_target_do_login_rx()
3099 * into a NOP.
3100 */
3101 if (!login->first_request)
3102 return 0;
3103
3104 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3105 if (ret)
3106 return ret;
3107
3108 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3109 return 0;
3110 }
3111
3112 static void
3113 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3114 struct isert_conn *isert_conn)
3115 {
3116 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3117 struct rdma_route *cm_route = &cm_id->route;
3118 struct sockaddr_in *sock_in;
3119 struct sockaddr_in6 *sock_in6;
3120
3121 conn->login_family = np->np_sockaddr.ss_family;
3122
3123 if (np->np_sockaddr.ss_family == AF_INET6) {
3124 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3125 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3126 &sock_in6->sin6_addr.in6_u);
3127 conn->login_port = ntohs(sock_in6->sin6_port);
3128
3129 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3130 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3131 &sock_in6->sin6_addr.in6_u);
3132 conn->local_port = ntohs(sock_in6->sin6_port);
3133 } else {
3134 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3135 sprintf(conn->login_ip, "%pI4",
3136 &sock_in->sin_addr.s_addr);
3137 conn->login_port = ntohs(sock_in->sin_port);
3138
3139 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3140 sprintf(conn->local_ip, "%pI4",
3141 &sock_in->sin_addr.s_addr);
3142 conn->local_port = ntohs(sock_in->sin_port);
3143 }
3144 }
3145
3146 static int
3147 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3148 {
3149 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3150 struct isert_conn *isert_conn;
3151 int max_accept = 0, ret;
3152
3153 accept_wait:
3154 ret = down_interruptible(&isert_np->np_sem);
3155 if (max_accept > 5)
3156 return -ENODEV;
3157
3158 spin_lock_bh(&np->np_thread_lock);
3159 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3160 spin_unlock_bh(&np->np_thread_lock);
3161 pr_debug("np_thread_state %d for isert_accept_np\n",
3162 np->np_thread_state);
3163 /**
3164 * No point in stalling here when np_thread
3165 * is in state RESET/SHUTDOWN/EXIT - bail
3166 **/
3167 return -ENODEV;
3168 }
3169 spin_unlock_bh(&np->np_thread_lock);
3170
3171 mutex_lock(&isert_np->np_accept_mutex);
3172 if (list_empty(&isert_np->np_accept_list)) {
3173 mutex_unlock(&isert_np->np_accept_mutex);
3174 max_accept++;
3175 goto accept_wait;
3176 }
3177 isert_conn = list_first_entry(&isert_np->np_accept_list,
3178 struct isert_conn, conn_accept_node);
3179 list_del_init(&isert_conn->conn_accept_node);
3180 mutex_unlock(&isert_np->np_accept_mutex);
3181
3182 conn->context = isert_conn;
3183 isert_conn->conn = conn;
3184 max_accept = 0;
3185
3186 ret = isert_rdma_post_recvl(isert_conn);
3187 if (ret)
3188 return ret;
3189
3190 ret = isert_rdma_accept(isert_conn);
3191 if (ret)
3192 return ret;
3193
3194 isert_set_conn_info(np, conn, isert_conn);
3195
3196 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3197 return 0;
3198 }
3199
3200 static void
3201 isert_free_np(struct iscsi_np *np)
3202 {
3203 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3204
3205 rdma_destroy_id(isert_np->np_cm_id);
3206
3207 np->np_context = NULL;
3208 kfree(isert_np);
3209 }
3210
3211 static void isert_wait_conn(struct iscsi_conn *conn)
3212 {
3213 struct isert_conn *isert_conn = conn->context;
3214
3215 pr_debug("isert_wait_conn: Starting \n");
3216
3217 mutex_lock(&isert_conn->conn_mutex);
3218 if (isert_conn->conn_cm_id) {
3219 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
3220 rdma_disconnect(isert_conn->conn_cm_id);
3221 }
3222 /*
3223 * Only wait for conn_wait_comp_err if the isert_conn made it
3224 * into full feature phase..
3225 */
3226 if (isert_conn->state == ISER_CONN_INIT) {
3227 mutex_unlock(&isert_conn->conn_mutex);
3228 return;
3229 }
3230 if (isert_conn->state == ISER_CONN_UP)
3231 isert_conn->state = ISER_CONN_TERMINATING;
3232 mutex_unlock(&isert_conn->conn_mutex);
3233
3234 wait_for_completion(&isert_conn->conn_wait_comp_err);
3235
3236 wait_for_completion(&isert_conn->conn_wait);
3237 isert_put_conn(isert_conn);
3238 }
3239
3240 static void isert_free_conn(struct iscsi_conn *conn)
3241 {
3242 struct isert_conn *isert_conn = conn->context;
3243
3244 isert_put_conn(isert_conn);
3245 }
3246
3247 static struct iscsit_transport iser_target_transport = {
3248 .name = "IB/iSER",
3249 .transport_type = ISCSI_INFINIBAND,
3250 .priv_size = sizeof(struct isert_cmd),
3251 .owner = THIS_MODULE,
3252 .iscsit_setup_np = isert_setup_np,
3253 .iscsit_accept_np = isert_accept_np,
3254 .iscsit_free_np = isert_free_np,
3255 .iscsit_wait_conn = isert_wait_conn,
3256 .iscsit_free_conn = isert_free_conn,
3257 .iscsit_get_login_rx = isert_get_login_rx,
3258 .iscsit_put_login_tx = isert_put_login_tx,
3259 .iscsit_immediate_queue = isert_immediate_queue,
3260 .iscsit_response_queue = isert_response_queue,
3261 .iscsit_get_dataout = isert_get_dataout,
3262 .iscsit_queue_data_in = isert_put_datain,
3263 .iscsit_queue_status = isert_put_response,
3264 .iscsit_aborted_task = isert_aborted_task,
3265 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3266 };
3267
3268 static int __init isert_init(void)
3269 {
3270 int ret;
3271
3272 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3273 if (!isert_rx_wq) {
3274 pr_err("Unable to allocate isert_rx_wq\n");
3275 return -ENOMEM;
3276 }
3277
3278 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3279 if (!isert_comp_wq) {
3280 pr_err("Unable to allocate isert_comp_wq\n");
3281 ret = -ENOMEM;
3282 goto destroy_rx_wq;
3283 }
3284
3285 iscsit_register_transport(&iser_target_transport);
3286 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3287 return 0;
3288
3289 destroy_rx_wq:
3290 destroy_workqueue(isert_rx_wq);
3291 return ret;
3292 }
3293
3294 static void __exit isert_exit(void)
3295 {
3296 flush_scheduled_work();
3297 destroy_workqueue(isert_comp_wq);
3298 destroy_workqueue(isert_rx_wq);
3299 iscsit_unregister_transport(&iser_target_transport);
3300 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3301 }
3302
3303 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3304 MODULE_VERSION("0.1");
3305 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3306 MODULE_LICENSE("GPL");
3307
3308 module_init(isert_init);
3309 module_exit(isert_exit);
Linux kernel - Deliverables
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