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Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux
[mirror_ubuntu-artful-kernel.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 RisingTide Systems LLC.
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 <rdma/ib_verbs.h>
26 #include <rdma/rdma_cm.h>
27 #include <target/target_core_base.h>
28 #include <target/target_core_fabric.h>
29 #include <target/iscsi/iscsi_transport.h>
30
31 #include "isert_proto.h"
32 #include "ib_isert.h"
33
34 #define ISERT_MAX_CONN 8
35 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
36 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
37
38 static DEFINE_MUTEX(device_list_mutex);
39 static LIST_HEAD(device_list);
40 static struct workqueue_struct *isert_rx_wq;
41 static struct workqueue_struct *isert_comp_wq;
42 static struct kmem_cache *isert_cmd_cache;
43
44 static void
45 isert_qp_event_callback(struct ib_event *e, void *context)
46 {
47 struct isert_conn *isert_conn = (struct isert_conn *)context;
48
49 pr_err("isert_qp_event_callback event: %d\n", e->event);
50 switch (e->event) {
51 case IB_EVENT_COMM_EST:
52 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
53 break;
54 case IB_EVENT_QP_LAST_WQE_REACHED:
55 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
56 break;
57 default:
58 break;
59 }
60 }
61
62 static int
63 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
64 {
65 int ret;
66
67 ret = ib_query_device(ib_dev, devattr);
68 if (ret) {
69 pr_err("ib_query_device() failed: %d\n", ret);
70 return ret;
71 }
72 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
73 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
74
75 return 0;
76 }
77
78 static int
79 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
80 {
81 struct isert_device *device = isert_conn->conn_device;
82 struct ib_qp_init_attr attr;
83 struct ib_device_attr devattr;
84 int ret, index, min_index = 0;
85
86 memset(&devattr, 0, sizeof(struct ib_device_attr));
87 ret = isert_query_device(cma_id->device, &devattr);
88 if (ret)
89 return ret;
90
91 mutex_lock(&device_list_mutex);
92 for (index = 0; index < device->cqs_used; index++)
93 if (device->cq_active_qps[index] <
94 device->cq_active_qps[min_index])
95 min_index = index;
96 device->cq_active_qps[min_index]++;
97 pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
98 mutex_unlock(&device_list_mutex);
99
100 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
101 attr.event_handler = isert_qp_event_callback;
102 attr.qp_context = isert_conn;
103 attr.send_cq = device->dev_tx_cq[min_index];
104 attr.recv_cq = device->dev_rx_cq[min_index];
105 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
106 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
107 /*
108 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
109 * work-around for RDMA_READ..
110 */
111 attr.cap.max_send_sge = devattr.max_sge - 2;
112 isert_conn->max_sge = attr.cap.max_send_sge;
113
114 attr.cap.max_recv_sge = 1;
115 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
116 attr.qp_type = IB_QPT_RC;
117
118 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
119 cma_id->device);
120 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
121 isert_conn->conn_pd->device);
122
123 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
124 if (ret) {
125 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
126 return ret;
127 }
128 isert_conn->conn_qp = cma_id->qp;
129 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
130
131 return 0;
132 }
133
134 static void
135 isert_cq_event_callback(struct ib_event *e, void *context)
136 {
137 pr_debug("isert_cq_event_callback event: %d\n", e->event);
138 }
139
140 static int
141 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
142 {
143 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
144 struct iser_rx_desc *rx_desc;
145 struct ib_sge *rx_sg;
146 u64 dma_addr;
147 int i, j;
148
149 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
150 sizeof(struct iser_rx_desc), GFP_KERNEL);
151 if (!isert_conn->conn_rx_descs)
152 goto fail;
153
154 rx_desc = isert_conn->conn_rx_descs;
155
156 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
157 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
158 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
159 if (ib_dma_mapping_error(ib_dev, dma_addr))
160 goto dma_map_fail;
161
162 rx_desc->dma_addr = dma_addr;
163
164 rx_sg = &rx_desc->rx_sg;
165 rx_sg->addr = rx_desc->dma_addr;
166 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
167 rx_sg->lkey = isert_conn->conn_mr->lkey;
168 }
169
170 isert_conn->conn_rx_desc_head = 0;
171 return 0;
172
173 dma_map_fail:
174 rx_desc = isert_conn->conn_rx_descs;
175 for (j = 0; j < i; j++, rx_desc++) {
176 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
177 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
178 }
179 kfree(isert_conn->conn_rx_descs);
180 isert_conn->conn_rx_descs = NULL;
181 fail:
182 return -ENOMEM;
183 }
184
185 static void
186 isert_free_rx_descriptors(struct isert_conn *isert_conn)
187 {
188 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
189 struct iser_rx_desc *rx_desc;
190 int i;
191
192 if (!isert_conn->conn_rx_descs)
193 return;
194
195 rx_desc = isert_conn->conn_rx_descs;
196 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
197 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
198 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
199 }
200
201 kfree(isert_conn->conn_rx_descs);
202 isert_conn->conn_rx_descs = NULL;
203 }
204
205 static void isert_cq_tx_callback(struct ib_cq *, void *);
206 static void isert_cq_rx_callback(struct ib_cq *, void *);
207
208 static int
209 isert_create_device_ib_res(struct isert_device *device)
210 {
211 struct ib_device *ib_dev = device->ib_device;
212 struct isert_cq_desc *cq_desc;
213 int ret = 0, i, j;
214
215 device->cqs_used = min_t(int, num_online_cpus(),
216 device->ib_device->num_comp_vectors);
217 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
218 pr_debug("Using %d CQs, device %s supports %d vectors\n",
219 device->cqs_used, device->ib_device->name,
220 device->ib_device->num_comp_vectors);
221 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
222 device->cqs_used, GFP_KERNEL);
223 if (!device->cq_desc) {
224 pr_err("Unable to allocate device->cq_desc\n");
225 return -ENOMEM;
226 }
227 cq_desc = device->cq_desc;
228
229 device->dev_pd = ib_alloc_pd(ib_dev);
230 if (IS_ERR(device->dev_pd)) {
231 ret = PTR_ERR(device->dev_pd);
232 pr_err("ib_alloc_pd failed for dev_pd: %d\n", ret);
233 goto out_cq_desc;
234 }
235
236 for (i = 0; i < device->cqs_used; i++) {
237 cq_desc[i].device = device;
238 cq_desc[i].cq_index = i;
239
240 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
241 isert_cq_rx_callback,
242 isert_cq_event_callback,
243 (void *)&cq_desc[i],
244 ISER_MAX_RX_CQ_LEN, i);
245 if (IS_ERR(device->dev_rx_cq[i]))
246 goto out_cq;
247
248 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
249 isert_cq_tx_callback,
250 isert_cq_event_callback,
251 (void *)&cq_desc[i],
252 ISER_MAX_TX_CQ_LEN, i);
253 if (IS_ERR(device->dev_tx_cq[i]))
254 goto out_cq;
255
256 if (ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP))
257 goto out_cq;
258
259 if (ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP))
260 goto out_cq;
261 }
262
263 device->dev_mr = ib_get_dma_mr(device->dev_pd, IB_ACCESS_LOCAL_WRITE);
264 if (IS_ERR(device->dev_mr)) {
265 ret = PTR_ERR(device->dev_mr);
266 pr_err("ib_get_dma_mr failed for dev_mr: %d\n", ret);
267 goto out_cq;
268 }
269
270 return 0;
271
272 out_cq:
273 for (j = 0; j < i; j++) {
274 cq_desc = &device->cq_desc[j];
275
276 if (device->dev_rx_cq[j]) {
277 cancel_work_sync(&cq_desc->cq_rx_work);
278 ib_destroy_cq(device->dev_rx_cq[j]);
279 }
280 if (device->dev_tx_cq[j]) {
281 cancel_work_sync(&cq_desc->cq_tx_work);
282 ib_destroy_cq(device->dev_tx_cq[j]);
283 }
284 }
285 ib_dealloc_pd(device->dev_pd);
286
287 out_cq_desc:
288 kfree(device->cq_desc);
289
290 return ret;
291 }
292
293 static void
294 isert_free_device_ib_res(struct isert_device *device)
295 {
296 struct isert_cq_desc *cq_desc;
297 int i;
298
299 for (i = 0; i < device->cqs_used; i++) {
300 cq_desc = &device->cq_desc[i];
301
302 cancel_work_sync(&cq_desc->cq_rx_work);
303 cancel_work_sync(&cq_desc->cq_tx_work);
304 ib_destroy_cq(device->dev_rx_cq[i]);
305 ib_destroy_cq(device->dev_tx_cq[i]);
306 device->dev_rx_cq[i] = NULL;
307 device->dev_tx_cq[i] = NULL;
308 }
309
310 ib_dereg_mr(device->dev_mr);
311 ib_dealloc_pd(device->dev_pd);
312 kfree(device->cq_desc);
313 }
314
315 static void
316 isert_device_try_release(struct isert_device *device)
317 {
318 mutex_lock(&device_list_mutex);
319 device->refcount--;
320 if (!device->refcount) {
321 isert_free_device_ib_res(device);
322 list_del(&device->dev_node);
323 kfree(device);
324 }
325 mutex_unlock(&device_list_mutex);
326 }
327
328 static struct isert_device *
329 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
330 {
331 struct isert_device *device;
332 int ret;
333
334 mutex_lock(&device_list_mutex);
335 list_for_each_entry(device, &device_list, dev_node) {
336 if (device->ib_device->node_guid == cma_id->device->node_guid) {
337 device->refcount++;
338 mutex_unlock(&device_list_mutex);
339 return device;
340 }
341 }
342
343 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
344 if (!device) {
345 mutex_unlock(&device_list_mutex);
346 return ERR_PTR(-ENOMEM);
347 }
348
349 INIT_LIST_HEAD(&device->dev_node);
350
351 device->ib_device = cma_id->device;
352 ret = isert_create_device_ib_res(device);
353 if (ret) {
354 kfree(device);
355 mutex_unlock(&device_list_mutex);
356 return ERR_PTR(ret);
357 }
358
359 device->refcount++;
360 list_add_tail(&device->dev_node, &device_list);
361 mutex_unlock(&device_list_mutex);
362
363 return device;
364 }
365
366 static int
367 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
368 {
369 struct iscsi_np *np = cma_id->context;
370 struct isert_np *isert_np = np->np_context;
371 struct isert_conn *isert_conn;
372 struct isert_device *device;
373 struct ib_device *ib_dev = cma_id->device;
374 int ret = 0;
375
376 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
377 cma_id, cma_id->context);
378
379 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
380 if (!isert_conn) {
381 pr_err("Unable to allocate isert_conn\n");
382 return -ENOMEM;
383 }
384 isert_conn->state = ISER_CONN_INIT;
385 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
386 init_completion(&isert_conn->conn_login_comp);
387 init_waitqueue_head(&isert_conn->conn_wait);
388 init_waitqueue_head(&isert_conn->conn_wait_comp_err);
389 kref_init(&isert_conn->conn_kref);
390 kref_get(&isert_conn->conn_kref);
391
392 cma_id->context = isert_conn;
393 isert_conn->conn_cm_id = cma_id;
394 isert_conn->responder_resources = event->param.conn.responder_resources;
395 isert_conn->initiator_depth = event->param.conn.initiator_depth;
396 pr_debug("Using responder_resources: %u initiator_depth: %u\n",
397 isert_conn->responder_resources, isert_conn->initiator_depth);
398
399 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
400 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
401 if (!isert_conn->login_buf) {
402 pr_err("Unable to allocate isert_conn->login_buf\n");
403 ret = -ENOMEM;
404 goto out;
405 }
406
407 isert_conn->login_req_buf = isert_conn->login_buf;
408 isert_conn->login_rsp_buf = isert_conn->login_buf +
409 ISCSI_DEF_MAX_RECV_SEG_LEN;
410 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
411 isert_conn->login_buf, isert_conn->login_req_buf,
412 isert_conn->login_rsp_buf);
413
414 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
415 (void *)isert_conn->login_req_buf,
416 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
417
418 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
419 if (ret) {
420 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
421 ret);
422 isert_conn->login_req_dma = 0;
423 goto out_login_buf;
424 }
425
426 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
427 (void *)isert_conn->login_rsp_buf,
428 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
429
430 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
431 if (ret) {
432 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
433 ret);
434 isert_conn->login_rsp_dma = 0;
435 goto out_req_dma_map;
436 }
437
438 device = isert_device_find_by_ib_dev(cma_id);
439 if (IS_ERR(device)) {
440 ret = PTR_ERR(device);
441 goto out_rsp_dma_map;
442 }
443
444 isert_conn->conn_device = device;
445 isert_conn->conn_pd = device->dev_pd;
446 isert_conn->conn_mr = device->dev_mr;
447
448 ret = isert_conn_setup_qp(isert_conn, cma_id);
449 if (ret)
450 goto out_conn_dev;
451
452 mutex_lock(&isert_np->np_accept_mutex);
453 list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
454 mutex_unlock(&isert_np->np_accept_mutex);
455
456 pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
457 wake_up(&isert_np->np_accept_wq);
458 return 0;
459
460 out_conn_dev:
461 isert_device_try_release(device);
462 out_rsp_dma_map:
463 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
464 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
465 out_req_dma_map:
466 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
467 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
468 out_login_buf:
469 kfree(isert_conn->login_buf);
470 out:
471 kfree(isert_conn);
472 return ret;
473 }
474
475 static void
476 isert_connect_release(struct isert_conn *isert_conn)
477 {
478 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
479 struct isert_device *device = isert_conn->conn_device;
480 int cq_index;
481
482 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
483
484 if (isert_conn->conn_qp) {
485 cq_index = ((struct isert_cq_desc *)
486 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
487 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
488 isert_conn->conn_device->cq_active_qps[cq_index]--;
489
490 rdma_destroy_qp(isert_conn->conn_cm_id);
491 }
492
493 isert_free_rx_descriptors(isert_conn);
494 rdma_destroy_id(isert_conn->conn_cm_id);
495
496 if (isert_conn->login_buf) {
497 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
498 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
499 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
500 ISCSI_DEF_MAX_RECV_SEG_LEN,
501 DMA_FROM_DEVICE);
502 kfree(isert_conn->login_buf);
503 }
504 kfree(isert_conn);
505
506 if (device)
507 isert_device_try_release(device);
508
509 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
510 }
511
512 static void
513 isert_connected_handler(struct rdma_cm_id *cma_id)
514 {
515 return;
516 }
517
518 static void
519 isert_release_conn_kref(struct kref *kref)
520 {
521 struct isert_conn *isert_conn = container_of(kref,
522 struct isert_conn, conn_kref);
523
524 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
525 current->comm, current->pid);
526
527 isert_connect_release(isert_conn);
528 }
529
530 static void
531 isert_put_conn(struct isert_conn *isert_conn)
532 {
533 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
534 }
535
536 static void
537 isert_disconnect_work(struct work_struct *work)
538 {
539 struct isert_conn *isert_conn = container_of(work,
540 struct isert_conn, conn_logout_work);
541
542 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
543
544 isert_conn->state = ISER_CONN_DOWN;
545
546 if (isert_conn->post_recv_buf_count == 0 &&
547 atomic_read(&isert_conn->post_send_buf_count) == 0) {
548 pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
549 wake_up(&isert_conn->conn_wait);
550 }
551
552 isert_put_conn(isert_conn);
553 }
554
555 static void
556 isert_disconnected_handler(struct rdma_cm_id *cma_id)
557 {
558 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
559
560 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
561 schedule_work(&isert_conn->conn_logout_work);
562 }
563
564 static int
565 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
566 {
567 int ret = 0;
568
569 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
570 event->event, event->status, cma_id->context, cma_id);
571
572 switch (event->event) {
573 case RDMA_CM_EVENT_CONNECT_REQUEST:
574 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
575 ret = isert_connect_request(cma_id, event);
576 break;
577 case RDMA_CM_EVENT_ESTABLISHED:
578 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
579 isert_connected_handler(cma_id);
580 break;
581 case RDMA_CM_EVENT_DISCONNECTED:
582 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
583 isert_disconnected_handler(cma_id);
584 break;
585 case RDMA_CM_EVENT_DEVICE_REMOVAL:
586 case RDMA_CM_EVENT_ADDR_CHANGE:
587 break;
588 case RDMA_CM_EVENT_CONNECT_ERROR:
589 default:
590 pr_err("Unknown RDMA CMA event: %d\n", event->event);
591 break;
592 }
593
594 if (ret != 0) {
595 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
596 event->event, ret);
597 dump_stack();
598 }
599
600 return ret;
601 }
602
603 static int
604 isert_post_recv(struct isert_conn *isert_conn, u32 count)
605 {
606 struct ib_recv_wr *rx_wr, *rx_wr_failed;
607 int i, ret;
608 unsigned int rx_head = isert_conn->conn_rx_desc_head;
609 struct iser_rx_desc *rx_desc;
610
611 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
612 rx_desc = &isert_conn->conn_rx_descs[rx_head];
613 rx_wr->wr_id = (unsigned long)rx_desc;
614 rx_wr->sg_list = &rx_desc->rx_sg;
615 rx_wr->num_sge = 1;
616 rx_wr->next = rx_wr + 1;
617 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
618 }
619
620 rx_wr--;
621 rx_wr->next = NULL; /* mark end of work requests list */
622
623 isert_conn->post_recv_buf_count += count;
624 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
625 &rx_wr_failed);
626 if (ret) {
627 pr_err("ib_post_recv() failed with ret: %d\n", ret);
628 isert_conn->post_recv_buf_count -= count;
629 } else {
630 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
631 isert_conn->conn_rx_desc_head = rx_head;
632 }
633 return ret;
634 }
635
636 static int
637 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
638 {
639 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
640 struct ib_send_wr send_wr, *send_wr_failed;
641 int ret;
642
643 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
644 ISER_HEADERS_LEN, DMA_TO_DEVICE);
645
646 send_wr.next = NULL;
647 send_wr.wr_id = (unsigned long)tx_desc;
648 send_wr.sg_list = tx_desc->tx_sg;
649 send_wr.num_sge = tx_desc->num_sge;
650 send_wr.opcode = IB_WR_SEND;
651 send_wr.send_flags = IB_SEND_SIGNALED;
652
653 atomic_inc(&isert_conn->post_send_buf_count);
654
655 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
656 if (ret) {
657 pr_err("ib_post_send() failed, ret: %d\n", ret);
658 atomic_dec(&isert_conn->post_send_buf_count);
659 }
660
661 return ret;
662 }
663
664 static void
665 isert_create_send_desc(struct isert_conn *isert_conn,
666 struct isert_cmd *isert_cmd,
667 struct iser_tx_desc *tx_desc)
668 {
669 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
670
671 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
672 ISER_HEADERS_LEN, DMA_TO_DEVICE);
673
674 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
675 tx_desc->iser_header.flags = ISER_VER;
676
677 tx_desc->num_sge = 1;
678 tx_desc->isert_cmd = isert_cmd;
679
680 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
681 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
682 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
683 }
684 }
685
686 static int
687 isert_init_tx_hdrs(struct isert_conn *isert_conn,
688 struct iser_tx_desc *tx_desc)
689 {
690 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
691 u64 dma_addr;
692
693 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
694 ISER_HEADERS_LEN, DMA_TO_DEVICE);
695 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
696 pr_err("ib_dma_mapping_error() failed\n");
697 return -ENOMEM;
698 }
699
700 tx_desc->dma_addr = dma_addr;
701 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
702 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
703 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
704
705 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
706 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
707 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
708
709 return 0;
710 }
711
712 static void
713 isert_init_send_wr(struct isert_cmd *isert_cmd, struct ib_send_wr *send_wr)
714 {
715 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
716 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
717 send_wr->opcode = IB_WR_SEND;
718 send_wr->send_flags = IB_SEND_SIGNALED;
719 send_wr->sg_list = &isert_cmd->tx_desc.tx_sg[0];
720 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
721 }
722
723 static int
724 isert_rdma_post_recvl(struct isert_conn *isert_conn)
725 {
726 struct ib_recv_wr rx_wr, *rx_wr_fail;
727 struct ib_sge sge;
728 int ret;
729
730 memset(&sge, 0, sizeof(struct ib_sge));
731 sge.addr = isert_conn->login_req_dma;
732 sge.length = ISER_RX_LOGIN_SIZE;
733 sge.lkey = isert_conn->conn_mr->lkey;
734
735 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
736 sge.addr, sge.length, sge.lkey);
737
738 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
739 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
740 rx_wr.sg_list = &sge;
741 rx_wr.num_sge = 1;
742
743 isert_conn->post_recv_buf_count++;
744 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
745 if (ret) {
746 pr_err("ib_post_recv() failed: %d\n", ret);
747 isert_conn->post_recv_buf_count--;
748 }
749
750 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
751 return ret;
752 }
753
754 static int
755 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
756 u32 length)
757 {
758 struct isert_conn *isert_conn = conn->context;
759 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
760 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
761 int ret;
762
763 isert_create_send_desc(isert_conn, NULL, tx_desc);
764
765 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
766 sizeof(struct iscsi_hdr));
767
768 isert_init_tx_hdrs(isert_conn, tx_desc);
769
770 if (length > 0) {
771 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
772
773 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
774 length, DMA_TO_DEVICE);
775
776 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
777
778 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
779 length, DMA_TO_DEVICE);
780
781 tx_dsg->addr = isert_conn->login_rsp_dma;
782 tx_dsg->length = length;
783 tx_dsg->lkey = isert_conn->conn_mr->lkey;
784 tx_desc->num_sge = 2;
785 }
786 if (!login->login_failed) {
787 if (login->login_complete) {
788 ret = isert_alloc_rx_descriptors(isert_conn);
789 if (ret)
790 return ret;
791
792 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
793 if (ret)
794 return ret;
795
796 isert_conn->state = ISER_CONN_UP;
797 goto post_send;
798 }
799
800 ret = isert_rdma_post_recvl(isert_conn);
801 if (ret)
802 return ret;
803 }
804 post_send:
805 ret = isert_post_send(isert_conn, tx_desc);
806 if (ret)
807 return ret;
808
809 return 0;
810 }
811
812 static void
813 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
814 struct isert_conn *isert_conn)
815 {
816 struct iscsi_conn *conn = isert_conn->conn;
817 struct iscsi_login *login = conn->conn_login;
818 int size;
819
820 if (!login) {
821 pr_err("conn->conn_login is NULL\n");
822 dump_stack();
823 return;
824 }
825
826 if (login->first_request) {
827 struct iscsi_login_req *login_req =
828 (struct iscsi_login_req *)&rx_desc->iscsi_header;
829 /*
830 * Setup the initial iscsi_login values from the leading
831 * login request PDU.
832 */
833 login->leading_connection = (!login_req->tsih) ? 1 : 0;
834 login->current_stage =
835 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
836 >> 2;
837 login->version_min = login_req->min_version;
838 login->version_max = login_req->max_version;
839 memcpy(login->isid, login_req->isid, 6);
840 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
841 login->init_task_tag = login_req->itt;
842 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
843 login->cid = be16_to_cpu(login_req->cid);
844 login->tsih = be16_to_cpu(login_req->tsih);
845 }
846
847 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
848
849 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
850 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
851 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
852 memcpy(login->req_buf, &rx_desc->data[0], size);
853
854 complete(&isert_conn->conn_login_comp);
855 }
856
857 static void
858 isert_release_cmd(struct iscsi_cmd *cmd)
859 {
860 struct isert_cmd *isert_cmd = container_of(cmd, struct isert_cmd,
861 iscsi_cmd);
862
863 pr_debug("Entering isert_release_cmd %p >>>>>>>>>>>>>>>.\n", isert_cmd);
864
865 kfree(cmd->buf_ptr);
866 kfree(cmd->tmr_req);
867
868 kmem_cache_free(isert_cmd_cache, isert_cmd);
869 }
870
871 static struct iscsi_cmd
872 *isert_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp)
873 {
874 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
875 struct isert_cmd *isert_cmd;
876
877 isert_cmd = kmem_cache_zalloc(isert_cmd_cache, gfp);
878 if (!isert_cmd) {
879 pr_err("Unable to allocate isert_cmd\n");
880 return NULL;
881 }
882 isert_cmd->conn = isert_conn;
883 isert_cmd->iscsi_cmd.release_cmd = &isert_release_cmd;
884
885 return &isert_cmd->iscsi_cmd;
886 }
887
888 static int
889 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
890 struct isert_cmd *isert_cmd, struct iser_rx_desc *rx_desc,
891 unsigned char *buf)
892 {
893 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
894 struct iscsi_conn *conn = isert_conn->conn;
895 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
896 struct scatterlist *sg;
897 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
898 bool dump_payload = false;
899
900 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
901 if (rc < 0)
902 return rc;
903
904 imm_data = cmd->immediate_data;
905 imm_data_len = cmd->first_burst_len;
906 unsol_data = cmd->unsolicited_data;
907
908 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
909 if (rc < 0) {
910 return 0;
911 } else if (rc > 0) {
912 dump_payload = true;
913 goto sequence_cmd;
914 }
915
916 if (!imm_data)
917 return 0;
918
919 sg = &cmd->se_cmd.t_data_sg[0];
920 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
921
922 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
923 sg, sg_nents, &rx_desc->data[0], imm_data_len);
924
925 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
926
927 cmd->write_data_done += imm_data_len;
928
929 if (cmd->write_data_done == cmd->se_cmd.data_length) {
930 spin_lock_bh(&cmd->istate_lock);
931 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
932 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
933 spin_unlock_bh(&cmd->istate_lock);
934 }
935
936 sequence_cmd:
937 rc = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
938
939 if (!rc && dump_payload == false && unsol_data)
940 iscsit_set_unsoliticed_dataout(cmd);
941
942 if (rc == CMDSN_ERROR_CANNOT_RECOVER)
943 return iscsit_add_reject_from_cmd(
944 ISCSI_REASON_PROTOCOL_ERROR,
945 1, 0, (unsigned char *)hdr, cmd);
946
947 return 0;
948 }
949
950 static int
951 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
952 struct iser_rx_desc *rx_desc, unsigned char *buf)
953 {
954 struct scatterlist *sg_start;
955 struct iscsi_conn *conn = isert_conn->conn;
956 struct iscsi_cmd *cmd = NULL;
957 struct iscsi_data *hdr = (struct iscsi_data *)buf;
958 u32 unsol_data_len = ntoh24(hdr->dlength);
959 int rc, sg_nents, sg_off, page_off;
960
961 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
962 if (rc < 0)
963 return rc;
964 else if (!cmd)
965 return 0;
966 /*
967 * FIXME: Unexpected unsolicited_data out
968 */
969 if (!cmd->unsolicited_data) {
970 pr_err("Received unexpected solicited data payload\n");
971 dump_stack();
972 return -1;
973 }
974
975 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
976 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
977
978 sg_off = cmd->write_data_done / PAGE_SIZE;
979 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
980 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
981 page_off = cmd->write_data_done % PAGE_SIZE;
982 /*
983 * FIXME: Non page-aligned unsolicited_data out
984 */
985 if (page_off) {
986 pr_err("Received unexpected non-page aligned data payload\n");
987 dump_stack();
988 return -1;
989 }
990 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
991 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
992
993 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
994 unsol_data_len);
995
996 rc = iscsit_check_dataout_payload(cmd, hdr, false);
997 if (rc < 0)
998 return rc;
999
1000 return 0;
1001 }
1002
1003 static int
1004 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1005 uint32_t read_stag, uint64_t read_va,
1006 uint32_t write_stag, uint64_t write_va)
1007 {
1008 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1009 struct iscsi_conn *conn = isert_conn->conn;
1010 struct iscsi_cmd *cmd;
1011 struct isert_cmd *isert_cmd;
1012 int ret = -EINVAL;
1013 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1014
1015 switch (opcode) {
1016 case ISCSI_OP_SCSI_CMD:
1017 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1018 if (!cmd)
1019 break;
1020
1021 isert_cmd = container_of(cmd, struct isert_cmd, iscsi_cmd);
1022 isert_cmd->read_stag = read_stag;
1023 isert_cmd->read_va = read_va;
1024 isert_cmd->write_stag = write_stag;
1025 isert_cmd->write_va = write_va;
1026
1027 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd,
1028 rx_desc, (unsigned char *)hdr);
1029 break;
1030 case ISCSI_OP_NOOP_OUT:
1031 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1032 if (!cmd)
1033 break;
1034
1035 ret = iscsit_handle_nop_out(conn, cmd, (unsigned char *)hdr);
1036 break;
1037 case ISCSI_OP_SCSI_DATA_OUT:
1038 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1039 (unsigned char *)hdr);
1040 break;
1041 case ISCSI_OP_SCSI_TMFUNC:
1042 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1043 if (!cmd)
1044 break;
1045
1046 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1047 (unsigned char *)hdr);
1048 break;
1049 case ISCSI_OP_LOGOUT:
1050 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1051 if (!cmd)
1052 break;
1053
1054 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1055 if (ret > 0)
1056 wait_for_completion_timeout(&conn->conn_logout_comp,
1057 SECONDS_FOR_LOGOUT_COMP *
1058 HZ);
1059 break;
1060 default:
1061 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1062 dump_stack();
1063 break;
1064 }
1065
1066 return ret;
1067 }
1068
1069 static void
1070 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1071 {
1072 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1073 uint64_t read_va = 0, write_va = 0;
1074 uint32_t read_stag = 0, write_stag = 0;
1075 int rc;
1076
1077 switch (iser_hdr->flags & 0xF0) {
1078 case ISCSI_CTRL:
1079 if (iser_hdr->flags & ISER_RSV) {
1080 read_stag = be32_to_cpu(iser_hdr->read_stag);
1081 read_va = be64_to_cpu(iser_hdr->read_va);
1082 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1083 read_stag, (unsigned long long)read_va);
1084 }
1085 if (iser_hdr->flags & ISER_WSV) {
1086 write_stag = be32_to_cpu(iser_hdr->write_stag);
1087 write_va = be64_to_cpu(iser_hdr->write_va);
1088 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1089 write_stag, (unsigned long long)write_va);
1090 }
1091
1092 pr_debug("ISER ISCSI_CTRL PDU\n");
1093 break;
1094 case ISER_HELLO:
1095 pr_err("iSER Hello message\n");
1096 break;
1097 default:
1098 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1099 break;
1100 }
1101
1102 rc = isert_rx_opcode(isert_conn, rx_desc,
1103 read_stag, read_va, write_stag, write_va);
1104 }
1105
1106 static void
1107 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1108 unsigned long xfer_len)
1109 {
1110 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1111 struct iscsi_hdr *hdr;
1112 u64 rx_dma;
1113 int rx_buflen, outstanding;
1114
1115 if ((char *)desc == isert_conn->login_req_buf) {
1116 rx_dma = isert_conn->login_req_dma;
1117 rx_buflen = ISER_RX_LOGIN_SIZE;
1118 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1119 rx_dma, rx_buflen);
1120 } else {
1121 rx_dma = desc->dma_addr;
1122 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1123 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1124 rx_dma, rx_buflen);
1125 }
1126
1127 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1128
1129 hdr = &desc->iscsi_header;
1130 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1131 hdr->opcode, hdr->itt, hdr->flags,
1132 (int)(xfer_len - ISER_HEADERS_LEN));
1133
1134 if ((char *)desc == isert_conn->login_req_buf)
1135 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1136 isert_conn);
1137 else
1138 isert_rx_do_work(desc, isert_conn);
1139
1140 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1141 DMA_FROM_DEVICE);
1142
1143 isert_conn->post_recv_buf_count--;
1144 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1145 isert_conn->post_recv_buf_count);
1146
1147 if ((char *)desc == isert_conn->login_req_buf)
1148 return;
1149
1150 outstanding = isert_conn->post_recv_buf_count;
1151 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1152 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1153 ISERT_MIN_POSTED_RX);
1154 err = isert_post_recv(isert_conn, count);
1155 if (err) {
1156 pr_err("isert_post_recv() count: %d failed, %d\n",
1157 count, err);
1158 }
1159 }
1160 }
1161
1162 static void
1163 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1164 {
1165 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1166 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1167
1168 pr_debug("isert_unmap_cmd >>>>>>>>>>>>>>>>>>>>>>>\n");
1169
1170 if (wr->sge) {
1171 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
1172 wr->sge = NULL;
1173 }
1174
1175 kfree(wr->send_wr);
1176 wr->send_wr = NULL;
1177
1178 kfree(isert_cmd->ib_sge);
1179 isert_cmd->ib_sge = NULL;
1180 }
1181
1182 static void
1183 isert_put_cmd(struct isert_cmd *isert_cmd)
1184 {
1185 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1186 struct isert_conn *isert_conn = isert_cmd->conn;
1187 struct iscsi_conn *conn;
1188
1189 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1190
1191 switch (cmd->iscsi_opcode) {
1192 case ISCSI_OP_SCSI_CMD:
1193 conn = isert_conn->conn;
1194
1195 spin_lock_bh(&conn->cmd_lock);
1196 if (!list_empty(&cmd->i_conn_node))
1197 list_del(&cmd->i_conn_node);
1198 spin_unlock_bh(&conn->cmd_lock);
1199
1200 if (cmd->data_direction == DMA_TO_DEVICE)
1201 iscsit_stop_dataout_timer(cmd);
1202
1203 isert_unmap_cmd(isert_cmd, isert_conn);
1204 /*
1205 * Fall-through
1206 */
1207 case ISCSI_OP_SCSI_TMFUNC:
1208 transport_generic_free_cmd(&cmd->se_cmd, 0);
1209 break;
1210 case ISCSI_OP_REJECT:
1211 case ISCSI_OP_NOOP_OUT:
1212 conn = isert_conn->conn;
1213
1214 spin_lock_bh(&conn->cmd_lock);
1215 if (!list_empty(&cmd->i_conn_node))
1216 list_del(&cmd->i_conn_node);
1217 spin_unlock_bh(&conn->cmd_lock);
1218
1219 /*
1220 * Handle special case for REJECT when iscsi_add_reject*() has
1221 * overwritten the original iscsi_opcode assignment, and the
1222 * associated cmd->se_cmd needs to be released.
1223 */
1224 if (cmd->se_cmd.se_tfo != NULL) {
1225 transport_generic_free_cmd(&cmd->se_cmd, 0);
1226 break;
1227 }
1228 /*
1229 * Fall-through
1230 */
1231 default:
1232 isert_release_cmd(cmd);
1233 break;
1234 }
1235 }
1236
1237 static void
1238 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1239 {
1240 if (tx_desc->dma_addr != 0) {
1241 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1242 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1243 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1244 tx_desc->dma_addr = 0;
1245 }
1246 }
1247
1248 static void
1249 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1250 struct ib_device *ib_dev)
1251 {
1252 if (isert_cmd->sense_buf_dma != 0) {
1253 pr_debug("Calling ib_dma_unmap_single for isert_cmd->sense_buf_dma\n");
1254 ib_dma_unmap_single(ib_dev, isert_cmd->sense_buf_dma,
1255 isert_cmd->sense_buf_len, DMA_TO_DEVICE);
1256 isert_cmd->sense_buf_dma = 0;
1257 }
1258
1259 isert_unmap_tx_desc(tx_desc, ib_dev);
1260 isert_put_cmd(isert_cmd);
1261 }
1262
1263 static void
1264 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1265 struct isert_cmd *isert_cmd)
1266 {
1267 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1268 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1269 struct se_cmd *se_cmd = &cmd->se_cmd;
1270 struct ib_device *ib_dev = isert_cmd->conn->conn_cm_id->device;
1271
1272 iscsit_stop_dataout_timer(cmd);
1273
1274 if (wr->sge) {
1275 pr_debug("isert_do_rdma_read_comp: Unmapping wr->sge from t_data_sg\n");
1276 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
1277 wr->sge = NULL;
1278 }
1279
1280 if (isert_cmd->ib_sge) {
1281 pr_debug("isert_do_rdma_read_comp: Freeing isert_cmd->ib_sge\n");
1282 kfree(isert_cmd->ib_sge);
1283 isert_cmd->ib_sge = NULL;
1284 }
1285
1286 cmd->write_data_done = se_cmd->data_length;
1287
1288 pr_debug("isert_do_rdma_read_comp, calling target_execute_cmd\n");
1289 spin_lock_bh(&cmd->istate_lock);
1290 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1291 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1292 spin_unlock_bh(&cmd->istate_lock);
1293
1294 target_execute_cmd(se_cmd);
1295 }
1296
1297 static void
1298 isert_do_control_comp(struct work_struct *work)
1299 {
1300 struct isert_cmd *isert_cmd = container_of(work,
1301 struct isert_cmd, comp_work);
1302 struct isert_conn *isert_conn = isert_cmd->conn;
1303 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1304 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1305
1306 switch (cmd->i_state) {
1307 case ISTATE_SEND_TASKMGTRSP:
1308 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1309
1310 atomic_dec(&isert_conn->post_send_buf_count);
1311 iscsit_tmr_post_handler(cmd, cmd->conn);
1312
1313 cmd->i_state = ISTATE_SENT_STATUS;
1314 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1315 break;
1316 case ISTATE_SEND_REJECT:
1317 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1318 atomic_dec(&isert_conn->post_send_buf_count);
1319
1320 cmd->i_state = ISTATE_SENT_STATUS;
1321 complete(&cmd->reject_comp);
1322 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1323 case ISTATE_SEND_LOGOUTRSP:
1324 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1325 /*
1326 * Call atomic_dec(&isert_conn->post_send_buf_count)
1327 * from isert_free_conn()
1328 */
1329 isert_conn->logout_posted = true;
1330 iscsit_logout_post_handler(cmd, cmd->conn);
1331 break;
1332 default:
1333 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1334 dump_stack();
1335 break;
1336 }
1337 }
1338
1339 static void
1340 isert_response_completion(struct iser_tx_desc *tx_desc,
1341 struct isert_cmd *isert_cmd,
1342 struct isert_conn *isert_conn,
1343 struct ib_device *ib_dev)
1344 {
1345 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1346
1347 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1348 cmd->i_state == ISTATE_SEND_LOGOUTRSP) {
1349 isert_unmap_tx_desc(tx_desc, ib_dev);
1350
1351 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1352 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1353 return;
1354 }
1355 atomic_dec(&isert_conn->post_send_buf_count);
1356
1357 cmd->i_state = ISTATE_SENT_STATUS;
1358 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1359 }
1360
1361 static void
1362 isert_send_completion(struct iser_tx_desc *tx_desc,
1363 struct isert_conn *isert_conn)
1364 {
1365 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1366 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1367 struct isert_rdma_wr *wr;
1368
1369 if (!isert_cmd) {
1370 atomic_dec(&isert_conn->post_send_buf_count);
1371 isert_unmap_tx_desc(tx_desc, ib_dev);
1372 return;
1373 }
1374 wr = &isert_cmd->rdma_wr;
1375
1376 switch (wr->iser_ib_op) {
1377 case ISER_IB_RECV:
1378 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1379 dump_stack();
1380 break;
1381 case ISER_IB_SEND:
1382 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1383 isert_response_completion(tx_desc, isert_cmd,
1384 isert_conn, ib_dev);
1385 break;
1386 case ISER_IB_RDMA_WRITE:
1387 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1388 dump_stack();
1389 break;
1390 case ISER_IB_RDMA_READ:
1391 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1392
1393 atomic_dec(&isert_conn->post_send_buf_count);
1394 isert_completion_rdma_read(tx_desc, isert_cmd);
1395 break;
1396 default:
1397 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1398 dump_stack();
1399 break;
1400 }
1401 }
1402
1403 static void
1404 isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1405 {
1406 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1407
1408 if (tx_desc) {
1409 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1410
1411 if (!isert_cmd)
1412 isert_unmap_tx_desc(tx_desc, ib_dev);
1413 else
1414 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1415 }
1416
1417 if (isert_conn->post_recv_buf_count == 0 &&
1418 atomic_read(&isert_conn->post_send_buf_count) == 0) {
1419 pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1420 pr_debug("Calling wake_up from isert_cq_comp_err\n");
1421
1422 isert_conn->state = ISER_CONN_TERMINATING;
1423 wake_up(&isert_conn->conn_wait_comp_err);
1424 }
1425 }
1426
1427 static void
1428 isert_cq_tx_work(struct work_struct *work)
1429 {
1430 struct isert_cq_desc *cq_desc = container_of(work,
1431 struct isert_cq_desc, cq_tx_work);
1432 struct isert_device *device = cq_desc->device;
1433 int cq_index = cq_desc->cq_index;
1434 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1435 struct isert_conn *isert_conn;
1436 struct iser_tx_desc *tx_desc;
1437 struct ib_wc wc;
1438
1439 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1440 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1441 isert_conn = wc.qp->qp_context;
1442
1443 if (wc.status == IB_WC_SUCCESS) {
1444 isert_send_completion(tx_desc, isert_conn);
1445 } else {
1446 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1447 pr_debug("TX wc.status: 0x%08x\n", wc.status);
1448 atomic_dec(&isert_conn->post_send_buf_count);
1449 isert_cq_comp_err(tx_desc, isert_conn);
1450 }
1451 }
1452
1453 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1454 }
1455
1456 static void
1457 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1458 {
1459 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1460
1461 INIT_WORK(&cq_desc->cq_tx_work, isert_cq_tx_work);
1462 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1463 }
1464
1465 static void
1466 isert_cq_rx_work(struct work_struct *work)
1467 {
1468 struct isert_cq_desc *cq_desc = container_of(work,
1469 struct isert_cq_desc, cq_rx_work);
1470 struct isert_device *device = cq_desc->device;
1471 int cq_index = cq_desc->cq_index;
1472 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1473 struct isert_conn *isert_conn;
1474 struct iser_rx_desc *rx_desc;
1475 struct ib_wc wc;
1476 unsigned long xfer_len;
1477
1478 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1479 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1480 isert_conn = wc.qp->qp_context;
1481
1482 if (wc.status == IB_WC_SUCCESS) {
1483 xfer_len = (unsigned long)wc.byte_len;
1484 isert_rx_completion(rx_desc, isert_conn, xfer_len);
1485 } else {
1486 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1487 if (wc.status != IB_WC_WR_FLUSH_ERR)
1488 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1489
1490 isert_conn->post_recv_buf_count--;
1491 isert_cq_comp_err(NULL, isert_conn);
1492 }
1493 }
1494
1495 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1496 }
1497
1498 static void
1499 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1500 {
1501 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1502
1503 INIT_WORK(&cq_desc->cq_rx_work, isert_cq_rx_work);
1504 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1505 }
1506
1507 static int
1508 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1509 {
1510 struct ib_send_wr *wr_failed;
1511 int ret;
1512
1513 atomic_inc(&isert_conn->post_send_buf_count);
1514
1515 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1516 &wr_failed);
1517 if (ret) {
1518 pr_err("ib_post_send failed with %d\n", ret);
1519 atomic_dec(&isert_conn->post_send_buf_count);
1520 return ret;
1521 }
1522 return ret;
1523 }
1524
1525 static int
1526 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1527 {
1528 struct isert_cmd *isert_cmd = container_of(cmd,
1529 struct isert_cmd, iscsi_cmd);
1530 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1531 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1532 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1533 &isert_cmd->tx_desc.iscsi_header;
1534
1535 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1536 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1537 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1538 /*
1539 * Attach SENSE DATA payload to iSCSI Response PDU
1540 */
1541 if (cmd->se_cmd.sense_buffer &&
1542 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1543 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1544 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1545 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1546 u32 padding, sense_len;
1547
1548 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1549 cmd->sense_buffer);
1550 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1551
1552 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1553 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1554 sense_len = cmd->se_cmd.scsi_sense_length + padding;
1555
1556 isert_cmd->sense_buf_dma = ib_dma_map_single(ib_dev,
1557 (void *)cmd->sense_buffer, sense_len,
1558 DMA_TO_DEVICE);
1559
1560 isert_cmd->sense_buf_len = sense_len;
1561 tx_dsg->addr = isert_cmd->sense_buf_dma;
1562 tx_dsg->length = sense_len;
1563 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1564 isert_cmd->tx_desc.num_sge = 2;
1565 }
1566
1567 isert_init_send_wr(isert_cmd, send_wr);
1568
1569 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1570
1571 return isert_post_response(isert_conn, isert_cmd);
1572 }
1573
1574 static int
1575 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1576 bool nopout_response)
1577 {
1578 struct isert_cmd *isert_cmd = container_of(cmd,
1579 struct isert_cmd, iscsi_cmd);
1580 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1581 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1582
1583 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1584 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1585 &isert_cmd->tx_desc.iscsi_header,
1586 nopout_response);
1587 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1588 isert_init_send_wr(isert_cmd, send_wr);
1589
1590 pr_debug("Posting NOPIN Reponse IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1591
1592 return isert_post_response(isert_conn, isert_cmd);
1593 }
1594
1595 static int
1596 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1597 {
1598 struct isert_cmd *isert_cmd = container_of(cmd,
1599 struct isert_cmd, iscsi_cmd);
1600 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1601 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1602
1603 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1604 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1605 &isert_cmd->tx_desc.iscsi_header);
1606 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1607 isert_init_send_wr(isert_cmd, send_wr);
1608
1609 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1610
1611 return isert_post_response(isert_conn, isert_cmd);
1612 }
1613
1614 static int
1615 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1616 {
1617 struct isert_cmd *isert_cmd = container_of(cmd,
1618 struct isert_cmd, iscsi_cmd);
1619 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1620 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1621
1622 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1623 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1624 &isert_cmd->tx_desc.iscsi_header);
1625 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1626 isert_init_send_wr(isert_cmd, send_wr);
1627
1628 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1629
1630 return isert_post_response(isert_conn, isert_cmd);
1631 }
1632
1633 static int
1634 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1635 {
1636 struct isert_cmd *isert_cmd = container_of(cmd,
1637 struct isert_cmd, iscsi_cmd);
1638 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1639 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1640
1641 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1642 iscsit_build_reject(cmd, conn, (struct iscsi_reject *)
1643 &isert_cmd->tx_desc.iscsi_header);
1644 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1645 isert_init_send_wr(isert_cmd, send_wr);
1646
1647 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1648
1649 return isert_post_response(isert_conn, isert_cmd);
1650 }
1651
1652 static int
1653 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1654 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
1655 u32 data_left, u32 offset)
1656 {
1657 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1658 struct scatterlist *sg_start, *tmp_sg;
1659 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1660 u32 sg_off, page_off;
1661 int i = 0, sg_nents;
1662
1663 sg_off = offset / PAGE_SIZE;
1664 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1665 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
1666 page_off = offset % PAGE_SIZE;
1667
1668 send_wr->sg_list = ib_sge;
1669 send_wr->num_sge = sg_nents;
1670 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
1671 /*
1672 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
1673 */
1674 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
1675 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
1676 (unsigned long long)tmp_sg->dma_address,
1677 tmp_sg->length, page_off);
1678
1679 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
1680 ib_sge->length = min_t(u32, data_left,
1681 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
1682 ib_sge->lkey = isert_conn->conn_mr->lkey;
1683
1684 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u\n",
1685 ib_sge->addr, ib_sge->length);
1686 page_off = 0;
1687 data_left -= ib_sge->length;
1688 ib_sge++;
1689 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
1690 }
1691
1692 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
1693 send_wr->sg_list, send_wr->num_sge);
1694
1695 return sg_nents;
1696 }
1697
1698 static int
1699 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1700 {
1701 struct se_cmd *se_cmd = &cmd->se_cmd;
1702 struct isert_cmd *isert_cmd = container_of(cmd,
1703 struct isert_cmd, iscsi_cmd);
1704 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1705 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1706 struct ib_send_wr *wr_failed, *send_wr;
1707 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1708 struct ib_sge *ib_sge;
1709 struct scatterlist *sg;
1710 u32 offset = 0, data_len, data_left, rdma_write_max;
1711 int rc, ret = 0, count, sg_nents, i, ib_sge_cnt;
1712
1713 pr_debug("RDMA_WRITE: data_length: %u\n", se_cmd->data_length);
1714
1715 sg = &se_cmd->t_data_sg[0];
1716 sg_nents = se_cmd->t_data_nents;
1717
1718 count = ib_dma_map_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
1719 if (unlikely(!count)) {
1720 pr_err("Unable to map put_datain SGs\n");
1721 return -EINVAL;
1722 }
1723 wr->sge = sg;
1724 wr->num_sge = sg_nents;
1725 pr_debug("Mapped IB count: %u sg: %p sg_nents: %u for RDMA_WRITE\n",
1726 count, sg, sg_nents);
1727
1728 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
1729 if (!ib_sge) {
1730 pr_warn("Unable to allocate datain ib_sge\n");
1731 ret = -ENOMEM;
1732 goto unmap_sg;
1733 }
1734 isert_cmd->ib_sge = ib_sge;
1735
1736 pr_debug("Allocated ib_sge: %p from t_data_ents: %d for RDMA_WRITE\n",
1737 ib_sge, se_cmd->t_data_nents);
1738
1739 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
1740 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
1741 GFP_KERNEL);
1742 if (!wr->send_wr) {
1743 pr_err("Unable to allocate wr->send_wr\n");
1744 ret = -ENOMEM;
1745 goto unmap_sg;
1746 }
1747 pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
1748 wr->send_wr, wr->send_wr_num);
1749
1750 iscsit_increment_maxcmdsn(cmd, conn->sess);
1751 cmd->stat_sn = conn->stat_sn++;
1752
1753 wr->isert_cmd = isert_cmd;
1754 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
1755 data_left = se_cmd->data_length;
1756
1757 for (i = 0; i < wr->send_wr_num; i++) {
1758 send_wr = &isert_cmd->rdma_wr.send_wr[i];
1759 data_len = min(data_left, rdma_write_max);
1760
1761 send_wr->opcode = IB_WR_RDMA_WRITE;
1762 send_wr->send_flags = 0;
1763 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
1764 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
1765
1766 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
1767 send_wr, data_len, offset);
1768 ib_sge += ib_sge_cnt;
1769
1770 if (i + 1 == wr->send_wr_num)
1771 send_wr->next = &isert_cmd->tx_desc.send_wr;
1772 else
1773 send_wr->next = &wr->send_wr[i + 1];
1774
1775 offset += data_len;
1776 data_left -= data_len;
1777 }
1778 /*
1779 * Build isert_conn->tx_desc for iSCSI response PDU and attach
1780 */
1781 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1782 iscsit_build_rsp_pdu(cmd, conn, false, (struct iscsi_scsi_rsp *)
1783 &isert_cmd->tx_desc.iscsi_header);
1784 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1785 isert_init_send_wr(isert_cmd, &isert_cmd->tx_desc.send_wr);
1786
1787 atomic_inc(&isert_conn->post_send_buf_count);
1788
1789 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
1790 if (rc) {
1791 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
1792 atomic_dec(&isert_conn->post_send_buf_count);
1793 }
1794 pr_debug("Posted RDMA_WRITE + Response for iSER Data READ\n");
1795 return 1;
1796
1797 unmap_sg:
1798 ib_dma_unmap_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
1799 return ret;
1800 }
1801
1802 static int
1803 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
1804 {
1805 struct se_cmd *se_cmd = &cmd->se_cmd;
1806 struct isert_cmd *isert_cmd = container_of(cmd,
1807 struct isert_cmd, iscsi_cmd);
1808 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1809 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1810 struct ib_send_wr *wr_failed, *send_wr;
1811 struct ib_sge *ib_sge;
1812 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1813 struct scatterlist *sg_start;
1814 u32 sg_off, sg_nents, page_off, va_offset = 0;
1815 u32 offset = 0, data_len, data_left, rdma_write_max;
1816 int rc, ret = 0, count, i, ib_sge_cnt;
1817
1818 pr_debug("RDMA_READ: data_length: %u write_data_done: %u\n",
1819 se_cmd->data_length, cmd->write_data_done);
1820
1821 sg_off = cmd->write_data_done / PAGE_SIZE;
1822 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1823 page_off = cmd->write_data_done % PAGE_SIZE;
1824
1825 pr_debug("RDMA_READ: sg_off: %d, sg_start: %p page_off: %d\n",
1826 sg_off, sg_start, page_off);
1827
1828 data_left = se_cmd->data_length - cmd->write_data_done;
1829 sg_nents = se_cmd->t_data_nents - sg_off;
1830
1831 pr_debug("RDMA_READ: data_left: %d, sg_nents: %d\n",
1832 data_left, sg_nents);
1833
1834 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
1835 if (unlikely(!count)) {
1836 pr_err("Unable to map get_dataout SGs\n");
1837 return -EINVAL;
1838 }
1839 wr->sge = sg_start;
1840 wr->num_sge = sg_nents;
1841 pr_debug("Mapped IB count: %u sg_start: %p sg_nents: %u for RDMA_READ\n",
1842 count, sg_start, sg_nents);
1843
1844 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
1845 if (!ib_sge) {
1846 pr_warn("Unable to allocate dataout ib_sge\n");
1847 ret = -ENOMEM;
1848 goto unmap_sg;
1849 }
1850 isert_cmd->ib_sge = ib_sge;
1851
1852 pr_debug("Using ib_sge: %p from sg_ents: %d for RDMA_READ\n",
1853 ib_sge, sg_nents);
1854
1855 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
1856 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
1857 GFP_KERNEL);
1858 if (!wr->send_wr) {
1859 pr_debug("Unable to allocate wr->send_wr\n");
1860 ret = -ENOMEM;
1861 goto unmap_sg;
1862 }
1863 pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
1864 wr->send_wr, wr->send_wr_num);
1865
1866 isert_cmd->tx_desc.isert_cmd = isert_cmd;
1867
1868 wr->iser_ib_op = ISER_IB_RDMA_READ;
1869 wr->isert_cmd = isert_cmd;
1870 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
1871 offset = cmd->write_data_done;
1872
1873 for (i = 0; i < wr->send_wr_num; i++) {
1874 send_wr = &isert_cmd->rdma_wr.send_wr[i];
1875 data_len = min(data_left, rdma_write_max);
1876
1877 send_wr->opcode = IB_WR_RDMA_READ;
1878 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
1879 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
1880
1881 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
1882 send_wr, data_len, offset);
1883 ib_sge += ib_sge_cnt;
1884
1885 if (i + 1 == wr->send_wr_num)
1886 send_wr->send_flags = IB_SEND_SIGNALED;
1887 else
1888 send_wr->next = &wr->send_wr[i + 1];
1889
1890 offset += data_len;
1891 va_offset += data_len;
1892 data_left -= data_len;
1893 }
1894
1895 atomic_inc(&isert_conn->post_send_buf_count);
1896
1897 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
1898 if (rc) {
1899 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
1900 atomic_dec(&isert_conn->post_send_buf_count);
1901 }
1902 pr_debug("Posted RDMA_READ memory for ISER Data WRITE\n");
1903 return 0;
1904
1905 unmap_sg:
1906 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
1907 return ret;
1908 }
1909
1910 static int
1911 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
1912 {
1913 int ret;
1914
1915 switch (state) {
1916 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
1917 ret = isert_put_nopin(cmd, conn, false);
1918 break;
1919 default:
1920 pr_err("Unknown immediate state: 0x%02x\n", state);
1921 ret = -EINVAL;
1922 break;
1923 }
1924
1925 return ret;
1926 }
1927
1928 static int
1929 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
1930 {
1931 int ret;
1932
1933 switch (state) {
1934 case ISTATE_SEND_LOGOUTRSP:
1935 ret = isert_put_logout_rsp(cmd, conn);
1936 if (!ret) {
1937 pr_debug("Returning iSER Logout -EAGAIN\n");
1938 ret = -EAGAIN;
1939 }
1940 break;
1941 case ISTATE_SEND_NOPIN:
1942 ret = isert_put_nopin(cmd, conn, true);
1943 break;
1944 case ISTATE_SEND_TASKMGTRSP:
1945 ret = isert_put_tm_rsp(cmd, conn);
1946 break;
1947 case ISTATE_SEND_REJECT:
1948 ret = isert_put_reject(cmd, conn);
1949 break;
1950 case ISTATE_SEND_STATUS:
1951 /*
1952 * Special case for sending non GOOD SCSI status from TX thread
1953 * context during pre se_cmd excecution failure.
1954 */
1955 ret = isert_put_response(conn, cmd);
1956 break;
1957 default:
1958 pr_err("Unknown response state: 0x%02x\n", state);
1959 ret = -EINVAL;
1960 break;
1961 }
1962
1963 return ret;
1964 }
1965
1966 static int
1967 isert_setup_np(struct iscsi_np *np,
1968 struct __kernel_sockaddr_storage *ksockaddr)
1969 {
1970 struct isert_np *isert_np;
1971 struct rdma_cm_id *isert_lid;
1972 struct sockaddr *sa;
1973 int ret;
1974
1975 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
1976 if (!isert_np) {
1977 pr_err("Unable to allocate struct isert_np\n");
1978 return -ENOMEM;
1979 }
1980 init_waitqueue_head(&isert_np->np_accept_wq);
1981 mutex_init(&isert_np->np_accept_mutex);
1982 INIT_LIST_HEAD(&isert_np->np_accept_list);
1983 init_completion(&isert_np->np_login_comp);
1984
1985 sa = (struct sockaddr *)ksockaddr;
1986 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
1987 /*
1988 * Setup the np->np_sockaddr from the passed sockaddr setup
1989 * in iscsi_target_configfs.c code..
1990 */
1991 memcpy(&np->np_sockaddr, ksockaddr,
1992 sizeof(struct __kernel_sockaddr_storage));
1993
1994 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
1995 IB_QPT_RC);
1996 if (IS_ERR(isert_lid)) {
1997 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
1998 PTR_ERR(isert_lid));
1999 ret = PTR_ERR(isert_lid);
2000 goto out;
2001 }
2002
2003 ret = rdma_bind_addr(isert_lid, sa);
2004 if (ret) {
2005 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2006 goto out_lid;
2007 }
2008
2009 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2010 if (ret) {
2011 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2012 goto out_lid;
2013 }
2014
2015 isert_np->np_cm_id = isert_lid;
2016 np->np_context = isert_np;
2017 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2018
2019 return 0;
2020
2021 out_lid:
2022 rdma_destroy_id(isert_lid);
2023 out:
2024 kfree(isert_np);
2025 return ret;
2026 }
2027
2028 static int
2029 isert_check_accept_queue(struct isert_np *isert_np)
2030 {
2031 int empty;
2032
2033 mutex_lock(&isert_np->np_accept_mutex);
2034 empty = list_empty(&isert_np->np_accept_list);
2035 mutex_unlock(&isert_np->np_accept_mutex);
2036
2037 return empty;
2038 }
2039
2040 static int
2041 isert_rdma_accept(struct isert_conn *isert_conn)
2042 {
2043 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2044 struct rdma_conn_param cp;
2045 int ret;
2046
2047 memset(&cp, 0, sizeof(struct rdma_conn_param));
2048 cp.responder_resources = isert_conn->responder_resources;
2049 cp.initiator_depth = isert_conn->initiator_depth;
2050 cp.retry_count = 7;
2051 cp.rnr_retry_count = 7;
2052
2053 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2054
2055 ret = rdma_accept(cm_id, &cp);
2056 if (ret) {
2057 pr_err("rdma_accept() failed with: %d\n", ret);
2058 return ret;
2059 }
2060
2061 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2062
2063 return 0;
2064 }
2065
2066 static int
2067 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2068 {
2069 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2070 int ret;
2071
2072 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2073
2074 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2075 if (ret)
2076 return ret;
2077
2078 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2079 return 0;
2080 }
2081
2082 static void
2083 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2084 struct isert_conn *isert_conn)
2085 {
2086 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2087 struct rdma_route *cm_route = &cm_id->route;
2088 struct sockaddr_in *sock_in;
2089 struct sockaddr_in6 *sock_in6;
2090
2091 conn->login_family = np->np_sockaddr.ss_family;
2092
2093 if (np->np_sockaddr.ss_family == AF_INET6) {
2094 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2095 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2096 &sock_in6->sin6_addr.in6_u);
2097 conn->login_port = ntohs(sock_in6->sin6_port);
2098
2099 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2100 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2101 &sock_in6->sin6_addr.in6_u);
2102 conn->local_port = ntohs(sock_in6->sin6_port);
2103 } else {
2104 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2105 sprintf(conn->login_ip, "%pI4",
2106 &sock_in->sin_addr.s_addr);
2107 conn->login_port = ntohs(sock_in->sin_port);
2108
2109 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2110 sprintf(conn->local_ip, "%pI4",
2111 &sock_in->sin_addr.s_addr);
2112 conn->local_port = ntohs(sock_in->sin_port);
2113 }
2114 }
2115
2116 static int
2117 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2118 {
2119 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2120 struct isert_conn *isert_conn;
2121 int max_accept = 0, ret;
2122
2123 accept_wait:
2124 ret = wait_event_interruptible(isert_np->np_accept_wq,
2125 !isert_check_accept_queue(isert_np) ||
2126 np->np_thread_state == ISCSI_NP_THREAD_RESET);
2127 if (max_accept > 5)
2128 return -ENODEV;
2129
2130 spin_lock_bh(&np->np_thread_lock);
2131 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2132 spin_unlock_bh(&np->np_thread_lock);
2133 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2134 return -ENODEV;
2135 }
2136 spin_unlock_bh(&np->np_thread_lock);
2137
2138 mutex_lock(&isert_np->np_accept_mutex);
2139 if (list_empty(&isert_np->np_accept_list)) {
2140 mutex_unlock(&isert_np->np_accept_mutex);
2141 max_accept++;
2142 goto accept_wait;
2143 }
2144 isert_conn = list_first_entry(&isert_np->np_accept_list,
2145 struct isert_conn, conn_accept_node);
2146 list_del_init(&isert_conn->conn_accept_node);
2147 mutex_unlock(&isert_np->np_accept_mutex);
2148
2149 conn->context = isert_conn;
2150 isert_conn->conn = conn;
2151 max_accept = 0;
2152
2153 ret = isert_rdma_post_recvl(isert_conn);
2154 if (ret)
2155 return ret;
2156
2157 ret = isert_rdma_accept(isert_conn);
2158 if (ret)
2159 return ret;
2160
2161 isert_set_conn_info(np, conn, isert_conn);
2162
2163 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2164 return 0;
2165 }
2166
2167 static void
2168 isert_free_np(struct iscsi_np *np)
2169 {
2170 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2171
2172 rdma_destroy_id(isert_np->np_cm_id);
2173
2174 np->np_context = NULL;
2175 kfree(isert_np);
2176 }
2177
2178 static void isert_free_conn(struct iscsi_conn *conn)
2179 {
2180 struct isert_conn *isert_conn = conn->context;
2181
2182 pr_debug("isert_free_conn: Starting \n");
2183 /*
2184 * Decrement post_send_buf_count for special case when called
2185 * from isert_do_control_comp() -> iscsit_logout_post_handler()
2186 */
2187 if (isert_conn->logout_posted)
2188 atomic_dec(&isert_conn->post_send_buf_count);
2189
2190 if (isert_conn->conn_cm_id)
2191 rdma_disconnect(isert_conn->conn_cm_id);
2192 /*
2193 * Only wait for conn_wait_comp_err if the isert_conn made it
2194 * into full feature phase..
2195 */
2196 if (isert_conn->state > ISER_CONN_INIT) {
2197 pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
2198 isert_conn->state);
2199 wait_event(isert_conn->conn_wait_comp_err,
2200 isert_conn->state == ISER_CONN_TERMINATING);
2201 pr_debug("isert_free_conn: After wait_event #1 >>>>>>>>>>>>\n");
2202 }
2203
2204 pr_debug("isert_free_conn: wait_event conn_wait %d\n", isert_conn->state);
2205 wait_event(isert_conn->conn_wait, isert_conn->state == ISER_CONN_DOWN);
2206 pr_debug("isert_free_conn: After wait_event #2 >>>>>>>>>>>>>>>>>>>>\n");
2207
2208 isert_put_conn(isert_conn);
2209 }
2210
2211 static struct iscsit_transport iser_target_transport = {
2212 .name = "IB/iSER",
2213 .transport_type = ISCSI_INFINIBAND,
2214 .owner = THIS_MODULE,
2215 .iscsit_setup_np = isert_setup_np,
2216 .iscsit_accept_np = isert_accept_np,
2217 .iscsit_free_np = isert_free_np,
2218 .iscsit_free_conn = isert_free_conn,
2219 .iscsit_alloc_cmd = isert_alloc_cmd,
2220 .iscsit_get_login_rx = isert_get_login_rx,
2221 .iscsit_put_login_tx = isert_put_login_tx,
2222 .iscsit_immediate_queue = isert_immediate_queue,
2223 .iscsit_response_queue = isert_response_queue,
2224 .iscsit_get_dataout = isert_get_dataout,
2225 .iscsit_queue_data_in = isert_put_datain,
2226 .iscsit_queue_status = isert_put_response,
2227 };
2228
2229 static int __init isert_init(void)
2230 {
2231 int ret;
2232
2233 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2234 if (!isert_rx_wq) {
2235 pr_err("Unable to allocate isert_rx_wq\n");
2236 return -ENOMEM;
2237 }
2238
2239 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2240 if (!isert_comp_wq) {
2241 pr_err("Unable to allocate isert_comp_wq\n");
2242 ret = -ENOMEM;
2243 goto destroy_rx_wq;
2244 }
2245
2246 isert_cmd_cache = kmem_cache_create("isert_cmd_cache",
2247 sizeof(struct isert_cmd), __alignof__(struct isert_cmd),
2248 0, NULL);
2249 if (!isert_cmd_cache) {
2250 pr_err("Unable to create isert_cmd_cache\n");
2251 ret = -ENOMEM;
2252 goto destroy_tx_cq;
2253 }
2254
2255 iscsit_register_transport(&iser_target_transport);
2256 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2257 return 0;
2258
2259 destroy_tx_cq:
2260 destroy_workqueue(isert_comp_wq);
2261 destroy_rx_wq:
2262 destroy_workqueue(isert_rx_wq);
2263 return ret;
2264 }
2265
2266 static void __exit isert_exit(void)
2267 {
2268 kmem_cache_destroy(isert_cmd_cache);
2269 destroy_workqueue(isert_comp_wq);
2270 destroy_workqueue(isert_rx_wq);
2271 iscsit_unregister_transport(&iser_target_transport);
2272 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2273 }
2274
2275 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2276 MODULE_VERSION("0.1");
2277 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2278 MODULE_LICENSE("GPL");
2279
2280 module_init(isert_init);
2281 module_exit(isert_exit);
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