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[mirror_ubuntu-zesty-kernel.git] / drivers / infiniband / ulp / isert / ib_isert.c
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b8d26b3b
NB		 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
38static DEFINE_MUTEX(device_list_mutex);
39static LIST_HEAD(device_list);
40static struct workqueue_struct *isert_rx_wq;
41static struct workqueue_struct *isert_comp_wq;
42static struct kmem_cache *isert_cmd_cache;
43
44static void
45isert_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
62static int
63isert_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
78static int
79isert_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
134static void
135isert_cq_event_callback(struct ib_event *e, void *context)
136{
137 pr_debug("isert_cq_event_callback event: %d\n", e->event);
138}
139
140static int
141isert_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
173dma_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;
181fail:
182 return -ENOMEM;
183}
184
185static void
186isert_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
205static void isert_cq_tx_callback(struct ib_cq *, void *);
206static void isert_cq_rx_callback(struct ib_cq *, void *);
207
208static int
209isert_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
272out_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
287out_cq_desc:
288 kfree(device->cq_desc);
289
290 return ret;
291}
292
293static void
294isert_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
315static void
316isert_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
328static struct isert_device *
329isert_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
366static int
367isert_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);
b2cb9649 391 mutex_init(&isert_conn->conn_mutex);
b8d26b3b
NB		 392
393 cma_id->context = isert_conn;
394 isert_conn->conn_cm_id = cma_id;
395 isert_conn->responder_resources = event->param.conn.responder_resources;
396 isert_conn->initiator_depth = event->param.conn.initiator_depth;
397 pr_debug("Using responder_resources: %u initiator_depth: %u\n",
398 isert_conn->responder_resources, isert_conn->initiator_depth);
399
400 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
401 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
402 if (!isert_conn->login_buf) {
403 pr_err("Unable to allocate isert_conn->login_buf\n");
404 ret = -ENOMEM;
405 goto out;
406 }
407
408 isert_conn->login_req_buf = isert_conn->login_buf;
409 isert_conn->login_rsp_buf = isert_conn->login_buf +
410 ISCSI_DEF_MAX_RECV_SEG_LEN;
411 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
412 isert_conn->login_buf, isert_conn->login_req_buf,
413 isert_conn->login_rsp_buf);
414
415 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
416 (void *)isert_conn->login_req_buf,
417 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
418
419 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
420 if (ret) {
421 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
422 ret);
423 isert_conn->login_req_dma = 0;
424 goto out_login_buf;
425 }
426
427 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
428 (void *)isert_conn->login_rsp_buf,
429 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
430
431 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
432 if (ret) {
433 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
434 ret);
435 isert_conn->login_rsp_dma = 0;
436 goto out_req_dma_map;
437 }
438
439 device = isert_device_find_by_ib_dev(cma_id);
440 if (IS_ERR(device)) {
441 ret = PTR_ERR(device);
442 goto out_rsp_dma_map;
443 }
444
445 isert_conn->conn_device = device;
446 isert_conn->conn_pd = device->dev_pd;
447 isert_conn->conn_mr = device->dev_mr;
448
449 ret = isert_conn_setup_qp(isert_conn, cma_id);
450 if (ret)
451 goto out_conn_dev;
452
453 mutex_lock(&isert_np->np_accept_mutex);
454 list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
455 mutex_unlock(&isert_np->np_accept_mutex);
456
457 pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
458 wake_up(&isert_np->np_accept_wq);
459 return 0;
460
461out_conn_dev:
462 isert_device_try_release(device);
463out_rsp_dma_map:
464 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
465 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
466out_req_dma_map:
467 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
468 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
469out_login_buf:
470 kfree(isert_conn->login_buf);
471out:
472 kfree(isert_conn);
473 return ret;
474}
475
476static void
477isert_connect_release(struct isert_conn *isert_conn)
478{
479 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
480 struct isert_device *device = isert_conn->conn_device;
481 int cq_index;
482
483 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
484
485 if (isert_conn->conn_qp) {
486 cq_index = ((struct isert_cq_desc *)
487 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
488 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
489 isert_conn->conn_device->cq_active_qps[cq_index]--;
490
491 rdma_destroy_qp(isert_conn->conn_cm_id);
492 }
493
494 isert_free_rx_descriptors(isert_conn);
495 rdma_destroy_id(isert_conn->conn_cm_id);
496
497 if (isert_conn->login_buf) {
498 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
499 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
500 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
501 ISCSI_DEF_MAX_RECV_SEG_LEN,
502 DMA_FROM_DEVICE);
503 kfree(isert_conn->login_buf);
504 }
505 kfree(isert_conn);
506
507 if (device)
508 isert_device_try_release(device);
509
510 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
511}
512
513static void
514isert_connected_handler(struct rdma_cm_id *cma_id)
515{
516 return;
517}
518
519static void
520isert_release_conn_kref(struct kref *kref)
521{
522 struct isert_conn *isert_conn = container_of(kref,
523 struct isert_conn, conn_kref);
524
525 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
526 current->comm, current->pid);
527
528 isert_connect_release(isert_conn);
529}
530
531static void
532isert_put_conn(struct isert_conn *isert_conn)
533{
534 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
535}
536
537static void
538isert_disconnect_work(struct work_struct *work)
539{
540 struct isert_conn *isert_conn = container_of(work,
541 struct isert_conn, conn_logout_work);
542
543 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
b2cb9649 544 mutex_lock(&isert_conn->conn_mutex);
b8d26b3b
NB		 545 isert_conn->state = ISER_CONN_DOWN;
546
547 if (isert_conn->post_recv_buf_count == 0 &&
548 atomic_read(&isert_conn->post_send_buf_count) == 0) {
549 pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
b2cb9649
NB		 550 mutex_unlock(&isert_conn->conn_mutex);
551 goto wake_up;
552 }
553 if (!isert_conn->conn_cm_id) {
554 mutex_unlock(&isert_conn->conn_mutex);
555 isert_put_conn(isert_conn);
556 return;
557 }
558 if (!isert_conn->logout_posted) {
559 pr_debug("Calling rdma_disconnect for !logout_posted from"
560 " isert_disconnect_work\n");
561 rdma_disconnect(isert_conn->conn_cm_id);
562 mutex_unlock(&isert_conn->conn_mutex);
563 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
564 goto wake_up;
b8d26b3b 565 }
b2cb9649 566 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 567
b2cb9649
NB		 568wake_up:
569 wake_up(&isert_conn->conn_wait);
b8d26b3b
NB		 570 isert_put_conn(isert_conn);
571}
572
573static void
574isert_disconnected_handler(struct rdma_cm_id *cma_id)
575{
576 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
577
578 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
579 schedule_work(&isert_conn->conn_logout_work);
580}
581
582static int
583isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
584{
585 int ret = 0;
586
587 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
588 event->event, event->status, cma_id->context, cma_id);
589
590 switch (event->event) {
591 case RDMA_CM_EVENT_CONNECT_REQUEST:
592 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
593 ret = isert_connect_request(cma_id, event);
594 break;
595 case RDMA_CM_EVENT_ESTABLISHED:
596 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
597 isert_connected_handler(cma_id);
598 break;
599 case RDMA_CM_EVENT_DISCONNECTED:
600 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
601 isert_disconnected_handler(cma_id);
602 break;
603 case RDMA_CM_EVENT_DEVICE_REMOVAL:
604 case RDMA_CM_EVENT_ADDR_CHANGE:
605 break;
606 case RDMA_CM_EVENT_CONNECT_ERROR:
607 default:
608 pr_err("Unknown RDMA CMA event: %d\n", event->event);
609 break;
610 }
611
612 if (ret != 0) {
613 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
614 event->event, ret);
615 dump_stack();
616 }
617
618 return ret;
619}
620
621static int
622isert_post_recv(struct isert_conn *isert_conn, u32 count)
623{
624 struct ib_recv_wr *rx_wr, *rx_wr_failed;
625 int i, ret;
626 unsigned int rx_head = isert_conn->conn_rx_desc_head;
627 struct iser_rx_desc *rx_desc;
628
629 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
630 rx_desc = &isert_conn->conn_rx_descs[rx_head];
631 rx_wr->wr_id = (unsigned long)rx_desc;
632 rx_wr->sg_list = &rx_desc->rx_sg;
633 rx_wr->num_sge = 1;
634 rx_wr->next = rx_wr + 1;
635 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
636 }
637
638 rx_wr--;
639 rx_wr->next = NULL; /* mark end of work requests list */
640
641 isert_conn->post_recv_buf_count += count;
642 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
643 &rx_wr_failed);
644 if (ret) {
645 pr_err("ib_post_recv() failed with ret: %d\n", ret);
646 isert_conn->post_recv_buf_count -= count;
647 } else {
648 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
649 isert_conn->conn_rx_desc_head = rx_head;
650 }
651 return ret;
652}
653
654static int
655isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
656{
657 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
658 struct ib_send_wr send_wr, *send_wr_failed;
659 int ret;
660
661 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
662 ISER_HEADERS_LEN, DMA_TO_DEVICE);
663
664 send_wr.next = NULL;
665 send_wr.wr_id = (unsigned long)tx_desc;
666 send_wr.sg_list = tx_desc->tx_sg;
667 send_wr.num_sge = tx_desc->num_sge;
668 send_wr.opcode = IB_WR_SEND;
669 send_wr.send_flags = IB_SEND_SIGNALED;
670
671 atomic_inc(&isert_conn->post_send_buf_count);
672
673 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
674 if (ret) {
675 pr_err("ib_post_send() failed, ret: %d\n", ret);
676 atomic_dec(&isert_conn->post_send_buf_count);
677 }
678
679 return ret;
680}
681
682static void
683isert_create_send_desc(struct isert_conn *isert_conn,
684 struct isert_cmd *isert_cmd,
685 struct iser_tx_desc *tx_desc)
686{
687 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
688
689 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
690 ISER_HEADERS_LEN, DMA_TO_DEVICE);
691
692 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
693 tx_desc->iser_header.flags = ISER_VER;
694
695 tx_desc->num_sge = 1;
696 tx_desc->isert_cmd = isert_cmd;
697
698 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
699 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
700 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
701 }
702}
703
704static int
705isert_init_tx_hdrs(struct isert_conn *isert_conn,
706 struct iser_tx_desc *tx_desc)
707{
708 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
709 u64 dma_addr;
710
711 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
712 ISER_HEADERS_LEN, DMA_TO_DEVICE);
713 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
714 pr_err("ib_dma_mapping_error() failed\n");
715 return -ENOMEM;
716 }
717
718 tx_desc->dma_addr = dma_addr;
719 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
720 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
721 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
722
723 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
724 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
725 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
726
727 return 0;
728}
729
730static void
731isert_init_send_wr(struct isert_cmd *isert_cmd, struct ib_send_wr *send_wr)
732{
733 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
734 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
735 send_wr->opcode = IB_WR_SEND;
736 send_wr->send_flags = IB_SEND_SIGNALED;
737 send_wr->sg_list = &isert_cmd->tx_desc.tx_sg[0];
738 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
739}
740
741static int
742isert_rdma_post_recvl(struct isert_conn *isert_conn)
743{
744 struct ib_recv_wr rx_wr, *rx_wr_fail;
745 struct ib_sge sge;
746 int ret;
747
748 memset(&sge, 0, sizeof(struct ib_sge));
749 sge.addr = isert_conn->login_req_dma;
750 sge.length = ISER_RX_LOGIN_SIZE;
751 sge.lkey = isert_conn->conn_mr->lkey;
752
753 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
754 sge.addr, sge.length, sge.lkey);
755
756 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
757 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
758 rx_wr.sg_list = &sge;
759 rx_wr.num_sge = 1;
760
761 isert_conn->post_recv_buf_count++;
762 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
763 if (ret) {
764 pr_err("ib_post_recv() failed: %d\n", ret);
765 isert_conn->post_recv_buf_count--;
766 }
767
768 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
769 return ret;
770}
771
772static int
773isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
774 u32 length)
775{
776 struct isert_conn *isert_conn = conn->context;
777 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
778 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
779 int ret;
780
781 isert_create_send_desc(isert_conn, NULL, tx_desc);
782
783 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
784 sizeof(struct iscsi_hdr));
785
786 isert_init_tx_hdrs(isert_conn, tx_desc);
787
788 if (length > 0) {
789 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
790
791 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
792 length, DMA_TO_DEVICE);
793
794 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
795
796 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
797 length, DMA_TO_DEVICE);
798
799 tx_dsg->addr = isert_conn->login_rsp_dma;
800 tx_dsg->length = length;
801 tx_dsg->lkey = isert_conn->conn_mr->lkey;
802 tx_desc->num_sge = 2;
803 }
804 if (!login->login_failed) {
805 if (login->login_complete) {
806 ret = isert_alloc_rx_descriptors(isert_conn);
807 if (ret)
808 return ret;
809
810 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
811 if (ret)
812 return ret;
813
814 isert_conn->state = ISER_CONN_UP;
815 goto post_send;
816 }
817
818 ret = isert_rdma_post_recvl(isert_conn);
819 if (ret)
820 return ret;
821 }
822post_send:
823 ret = isert_post_send(isert_conn, tx_desc);
824 if (ret)
825 return ret;
826
827 return 0;
828}
829
830static void
831isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
832 struct isert_conn *isert_conn)
833{
834 struct iscsi_conn *conn = isert_conn->conn;
835 struct iscsi_login *login = conn->conn_login;
836 int size;
837
838 if (!login) {
839 pr_err("conn->conn_login is NULL\n");
840 dump_stack();
841 return;
842 }
843
844 if (login->first_request) {
845 struct iscsi_login_req *login_req =
846 (struct iscsi_login_req *)&rx_desc->iscsi_header;
847 /*
848 * Setup the initial iscsi_login values from the leading
849 * login request PDU.
850 */
851 login->leading_connection = (!login_req->tsih) ? 1 : 0;
852 login->current_stage =
853 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
854 >> 2;
855 login->version_min = login_req->min_version;
856 login->version_max = login_req->max_version;
857 memcpy(login->isid, login_req->isid, 6);
858 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
859 login->init_task_tag = login_req->itt;
860 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
861 login->cid = be16_to_cpu(login_req->cid);
862 login->tsih = be16_to_cpu(login_req->tsih);
863 }
864
865 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
866
867 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
868 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
869 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
870 memcpy(login->req_buf, &rx_desc->data[0], size);
871
872 complete(&isert_conn->conn_login_comp);
873}
874
875static void
876isert_release_cmd(struct iscsi_cmd *cmd)
877{
878 struct isert_cmd *isert_cmd = container_of(cmd, struct isert_cmd,
879 iscsi_cmd);
880
881 pr_debug("Entering isert_release_cmd %p >>>>>>>>>>>>>>>.\n", isert_cmd);
882
883 kfree(cmd->buf_ptr);
884 kfree(cmd->tmr_req);
885
886 kmem_cache_free(isert_cmd_cache, isert_cmd);
887}
888
889static struct iscsi_cmd
890*isert_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp)
891{
892 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
893 struct isert_cmd *isert_cmd;
894
895 isert_cmd = kmem_cache_zalloc(isert_cmd_cache, gfp);
896 if (!isert_cmd) {
897 pr_err("Unable to allocate isert_cmd\n");
898 return NULL;
899 }
900 isert_cmd->conn = isert_conn;
901 isert_cmd->iscsi_cmd.release_cmd = &isert_release_cmd;
902
903 return &isert_cmd->iscsi_cmd;
904}
905
906static int
907isert_handle_scsi_cmd(struct isert_conn *isert_conn,
908 struct isert_cmd *isert_cmd, struct iser_rx_desc *rx_desc,
909 unsigned char *buf)
910{
911 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
912 struct iscsi_conn *conn = isert_conn->conn;
913 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
914 struct scatterlist *sg;
915 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
916 bool dump_payload = false;
917
918 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
919 if (rc < 0)
920 return rc;
921
922 imm_data = cmd->immediate_data;
923 imm_data_len = cmd->first_burst_len;
924 unsol_data = cmd->unsolicited_data;
925
926 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
927 if (rc < 0) {
928 return 0;
929 } else if (rc > 0) {
930 dump_payload = true;
931 goto sequence_cmd;
932 }
933
934 if (!imm_data)
935 return 0;
936
937 sg = &cmd->se_cmd.t_data_sg[0];
938 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
939
940 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
941 sg, sg_nents, &rx_desc->data[0], imm_data_len);
942
943 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
944
945 cmd->write_data_done += imm_data_len;
946
947 if (cmd->write_data_done == cmd->se_cmd.data_length) {
948 spin_lock_bh(&cmd->istate_lock);
949 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
950 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
951 spin_unlock_bh(&cmd->istate_lock);
952 }
953
954sequence_cmd:
561bf158 955 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
b8d26b3b
NB		 956
957 if (!rc && dump_payload == false && unsol_data)
958 iscsit_set_unsoliticed_dataout(cmd);
959
b8d26b3b
NB		 960 return 0;
961}
962
963static int
964isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
965 struct iser_rx_desc *rx_desc, unsigned char *buf)
966{
967 struct scatterlist *sg_start;
968 struct iscsi_conn *conn = isert_conn->conn;
969 struct iscsi_cmd *cmd = NULL;
970 struct iscsi_data *hdr = (struct iscsi_data *)buf;
971 u32 unsol_data_len = ntoh24(hdr->dlength);
972 int rc, sg_nents, sg_off, page_off;
973
974 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
975 if (rc < 0)
976 return rc;
977 else if (!cmd)
978 return 0;
979 /*
980 * FIXME: Unexpected unsolicited_data out
981 */
982 if (!cmd->unsolicited_data) {
983 pr_err("Received unexpected solicited data payload\n");
984 dump_stack();
985 return -1;
986 }
987
988 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
989 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
990
991 sg_off = cmd->write_data_done / PAGE_SIZE;
992 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
993 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
994 page_off = cmd->write_data_done % PAGE_SIZE;
995 /*
996 * FIXME: Non page-aligned unsolicited_data out
997 */
998 if (page_off) {
999 pr_err("Received unexpected non-page aligned data payload\n");
1000 dump_stack();
1001 return -1;
1002 }
1003 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1004 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1005
1006 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1007 unsol_data_len);
1008
1009 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1010 if (rc < 0)
1011 return rc;
1012
1013 return 0;
1014}
1015
778de368
NB		 1016static int
1017isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1018 struct iser_rx_desc *rx_desc, unsigned char *buf)
1019{
1020 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1021 struct iscsi_conn *conn = isert_conn->conn;
1022 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1023 int rc;
1024
1025 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1026 if (rc < 0)
1027 return rc;
1028 /*
1029 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1030 */
1031
1032 return iscsit_process_nop_out(conn, cmd, hdr);
1033}
1034
b8d26b3b
NB		 1035static int
1036isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1037 uint32_t read_stag, uint64_t read_va,
1038 uint32_t write_stag, uint64_t write_va)
1039{
1040 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1041 struct iscsi_conn *conn = isert_conn->conn;
1042 struct iscsi_cmd *cmd;
1043 struct isert_cmd *isert_cmd;
1044 int ret = -EINVAL;
1045 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1046
1047 switch (opcode) {
1048 case ISCSI_OP_SCSI_CMD:
1049 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1050 if (!cmd)
1051 break;
1052
1053 isert_cmd = container_of(cmd, struct isert_cmd, iscsi_cmd);
1054 isert_cmd->read_stag = read_stag;
1055 isert_cmd->read_va = read_va;
1056 isert_cmd->write_stag = write_stag;
1057 isert_cmd->write_va = write_va;
1058
1059 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd,
1060 rx_desc, (unsigned char *)hdr);
1061 break;
1062 case ISCSI_OP_NOOP_OUT:
1063 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1064 if (!cmd)
1065 break;
1066
778de368
NB		 1067 isert_cmd = container_of(cmd, struct isert_cmd, iscsi_cmd);
1068 ret = isert_handle_nop_out(isert_conn, isert_cmd,
1069 rx_desc, (unsigned char *)hdr);
b8d26b3b
NB		 1070 break;
1071 case ISCSI_OP_SCSI_DATA_OUT:
1072 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1073 (unsigned char *)hdr);
1074 break;
1075 case ISCSI_OP_SCSI_TMFUNC:
1076 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1077 if (!cmd)
1078 break;
1079
1080 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1081 (unsigned char *)hdr);
1082 break;
1083 case ISCSI_OP_LOGOUT:
1084 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1085 if (!cmd)
1086 break;
1087
1088 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1089 if (ret > 0)
1090 wait_for_completion_timeout(&conn->conn_logout_comp,
1091 SECONDS_FOR_LOGOUT_COMP *
1092 HZ);
1093 break;
1094 default:
1095 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1096 dump_stack();
1097 break;
1098 }
1099
1100 return ret;
1101}
1102
1103static void
1104isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1105{
1106 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1107 uint64_t read_va = 0, write_va = 0;
1108 uint32_t read_stag = 0, write_stag = 0;
1109 int rc;
1110
1111 switch (iser_hdr->flags & 0xF0) {
1112 case ISCSI_CTRL:
1113 if (iser_hdr->flags & ISER_RSV) {
1114 read_stag = be32_to_cpu(iser_hdr->read_stag);
1115 read_va = be64_to_cpu(iser_hdr->read_va);
1116 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1117 read_stag, (unsigned long long)read_va);
1118 }
1119 if (iser_hdr->flags & ISER_WSV) {
1120 write_stag = be32_to_cpu(iser_hdr->write_stag);
1121 write_va = be64_to_cpu(iser_hdr->write_va);
1122 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1123 write_stag, (unsigned long long)write_va);
1124 }
1125
1126 pr_debug("ISER ISCSI_CTRL PDU\n");
1127 break;
1128 case ISER_HELLO:
1129 pr_err("iSER Hello message\n");
1130 break;
1131 default:
1132 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1133 break;
1134 }
1135
1136 rc = isert_rx_opcode(isert_conn, rx_desc,
1137 read_stag, read_va, write_stag, write_va);
1138}
1139
1140static void
1141isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1142 unsigned long xfer_len)
1143{
1144 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1145 struct iscsi_hdr *hdr;
1146 u64 rx_dma;
1147 int rx_buflen, outstanding;
1148
1149 if ((char *)desc == isert_conn->login_req_buf) {
1150 rx_dma = isert_conn->login_req_dma;
1151 rx_buflen = ISER_RX_LOGIN_SIZE;
1152 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1153 rx_dma, rx_buflen);
1154 } else {
1155 rx_dma = desc->dma_addr;
1156 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1157 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1158 rx_dma, rx_buflen);
1159 }
1160
1161 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1162
1163 hdr = &desc->iscsi_header;
1164 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1165 hdr->opcode, hdr->itt, hdr->flags,
1166 (int)(xfer_len - ISER_HEADERS_LEN));
1167
1168 if ((char *)desc == isert_conn->login_req_buf)
1169 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1170 isert_conn);
1171 else
1172 isert_rx_do_work(desc, isert_conn);
1173
1174 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1175 DMA_FROM_DEVICE);
1176
1177 isert_conn->post_recv_buf_count--;
1178 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1179 isert_conn->post_recv_buf_count);
1180
1181 if ((char *)desc == isert_conn->login_req_buf)
1182 return;
1183
1184 outstanding = isert_conn->post_recv_buf_count;
1185 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1186 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1187 ISERT_MIN_POSTED_RX);
1188 err = isert_post_recv(isert_conn, count);
1189 if (err) {
1190 pr_err("isert_post_recv() count: %d failed, %d\n",
1191 count, err);
1192 }
1193 }
1194}
1195
1196static void
1197isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1198{
1199 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1200 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1201
1202 pr_debug("isert_unmap_cmd >>>>>>>>>>>>>>>>>>>>>>>\n");
1203
1204 if (wr->sge) {
1205 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
1206 wr->sge = NULL;
1207 }
1208
1209 kfree(wr->send_wr);
1210 wr->send_wr = NULL;
1211
1212 kfree(isert_cmd->ib_sge);
1213 isert_cmd->ib_sge = NULL;
1214}
1215
1216static void
1217isert_put_cmd(struct isert_cmd *isert_cmd)
1218{
1219 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1220 struct isert_conn *isert_conn = isert_cmd->conn;
186a9647 1221 struct iscsi_conn *conn = isert_conn->conn;
b8d26b3b
NB		 1222
1223 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1224
1225 switch (cmd->iscsi_opcode) {
1226 case ISCSI_OP_SCSI_CMD:
b8d26b3b
NB		 1227 spin_lock_bh(&conn->cmd_lock);
1228 if (!list_empty(&cmd->i_conn_node))
1229 list_del(&cmd->i_conn_node);
1230 spin_unlock_bh(&conn->cmd_lock);
1231
1232 if (cmd->data_direction == DMA_TO_DEVICE)
1233 iscsit_stop_dataout_timer(cmd);
1234
1235 isert_unmap_cmd(isert_cmd, isert_conn);
186a9647
NB		 1236 transport_generic_free_cmd(&cmd->se_cmd, 0);
1237 break;
b8d26b3b 1238 case ISCSI_OP_SCSI_TMFUNC:
186a9647
NB		 1239 spin_lock_bh(&conn->cmd_lock);
1240 if (!list_empty(&cmd->i_conn_node))
1241 list_del(&cmd->i_conn_node);
1242 spin_unlock_bh(&conn->cmd_lock);
1243
b8d26b3b
NB		 1244 transport_generic_free_cmd(&cmd->se_cmd, 0);
1245 break;
1246 case ISCSI_OP_REJECT:
1247 case ISCSI_OP_NOOP_OUT:
b8d26b3b
NB		 1248 spin_lock_bh(&conn->cmd_lock);
1249 if (!list_empty(&cmd->i_conn_node))
1250 list_del(&cmd->i_conn_node);
1251 spin_unlock_bh(&conn->cmd_lock);
1252
1253 /*
1254 * Handle special case for REJECT when iscsi_add_reject*() has
1255 * overwritten the original iscsi_opcode assignment, and the
1256 * associated cmd->se_cmd needs to be released.
1257 */
1258 if (cmd->se_cmd.se_tfo != NULL) {
3df8f68a
NB		 1259 pr_debug("Calling transport_generic_free_cmd from"
1260 " isert_put_cmd for 0x%02x\n",
1261 cmd->iscsi_opcode);
b8d26b3b
NB		 1262 transport_generic_free_cmd(&cmd->se_cmd, 0);
1263 break;
1264 }
1265 /*
1266 * Fall-through
1267 */
1268 default:
1269 isert_release_cmd(cmd);
1270 break;
1271 }
1272}
1273
1274static void
1275isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1276{
1277 if (tx_desc->dma_addr != 0) {
1278 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1279 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1280 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1281 tx_desc->dma_addr = 0;
1282 }
1283}
1284
1285static void
1286isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1287 struct ib_device *ib_dev)
1288{
dbbc5d11
NB		 1289 if (isert_cmd->pdu_buf_dma != 0) {
1290 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1291 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1292 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1293 isert_cmd->pdu_buf_dma = 0;
b8d26b3b
NB		 1294 }
1295
1296 isert_unmap_tx_desc(tx_desc, ib_dev);
1297 isert_put_cmd(isert_cmd);
1298}
1299
1300static void
1301isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1302 struct isert_cmd *isert_cmd)
1303{
1304 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1305 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1306 struct se_cmd *se_cmd = &cmd->se_cmd;
1307 struct ib_device *ib_dev = isert_cmd->conn->conn_cm_id->device;
1308
1309 iscsit_stop_dataout_timer(cmd);
1310
1311 if (wr->sge) {
1312 pr_debug("isert_do_rdma_read_comp: Unmapping wr->sge from t_data_sg\n");
1313 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge, DMA_TO_DEVICE);
1314 wr->sge = NULL;
1315 }
1316
1317 if (isert_cmd->ib_sge) {
1318 pr_debug("isert_do_rdma_read_comp: Freeing isert_cmd->ib_sge\n");
1319 kfree(isert_cmd->ib_sge);
1320 isert_cmd->ib_sge = NULL;
1321 }
1322
1323 cmd->write_data_done = se_cmd->data_length;
1324
1325 pr_debug("isert_do_rdma_read_comp, calling target_execute_cmd\n");
1326 spin_lock_bh(&cmd->istate_lock);
1327 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1328 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1329 spin_unlock_bh(&cmd->istate_lock);
1330
1331 target_execute_cmd(se_cmd);
1332}
1333
1334static void
1335isert_do_control_comp(struct work_struct *work)
1336{
1337 struct isert_cmd *isert_cmd = container_of(work,
1338 struct isert_cmd, comp_work);
1339 struct isert_conn *isert_conn = isert_cmd->conn;
1340 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1341 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1342
1343 switch (cmd->i_state) {
1344 case ISTATE_SEND_TASKMGTRSP:
1345 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1346
1347 atomic_dec(&isert_conn->post_send_buf_count);
1348 iscsit_tmr_post_handler(cmd, cmd->conn);
1349
1350 cmd->i_state = ISTATE_SENT_STATUS;
1351 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1352 break;
1353 case ISTATE_SEND_REJECT:
1354 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1355 atomic_dec(&isert_conn->post_send_buf_count);
1356
1357 cmd->i_state = ISTATE_SENT_STATUS;
b8d26b3b 1358 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
3df8f68a 1359 break;
b8d26b3b
NB		 1360 case ISTATE_SEND_LOGOUTRSP:
1361 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1362 /*
1363 * Call atomic_dec(&isert_conn->post_send_buf_count)
1364 * from isert_free_conn()
1365 */
1366 isert_conn->logout_posted = true;
1367 iscsit_logout_post_handler(cmd, cmd->conn);
1368 break;
1369 default:
1370 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1371 dump_stack();
1372 break;
1373 }
1374}
1375
1376static void
1377isert_response_completion(struct iser_tx_desc *tx_desc,
1378 struct isert_cmd *isert_cmd,
1379 struct isert_conn *isert_conn,
1380 struct ib_device *ib_dev)
1381{
1382 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1383
1384 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
3df8f68a
NB		 1385 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1386 cmd->i_state == ISTATE_SEND_REJECT) {
b8d26b3b
NB		 1387 isert_unmap_tx_desc(tx_desc, ib_dev);
1388
1389 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1390 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1391 return;
1392 }
1393 atomic_dec(&isert_conn->post_send_buf_count);
1394
1395 cmd->i_state = ISTATE_SENT_STATUS;
1396 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1397}
1398
1399static void
1400isert_send_completion(struct iser_tx_desc *tx_desc,
1401 struct isert_conn *isert_conn)
1402{
1403 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1404 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1405 struct isert_rdma_wr *wr;
1406
1407 if (!isert_cmd) {
1408 atomic_dec(&isert_conn->post_send_buf_count);
1409 isert_unmap_tx_desc(tx_desc, ib_dev);
1410 return;
1411 }
1412 wr = &isert_cmd->rdma_wr;
1413
1414 switch (wr->iser_ib_op) {
1415 case ISER_IB_RECV:
1416 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1417 dump_stack();
1418 break;
1419 case ISER_IB_SEND:
1420 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1421 isert_response_completion(tx_desc, isert_cmd,
1422 isert_conn, ib_dev);
1423 break;
1424 case ISER_IB_RDMA_WRITE:
1425 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1426 dump_stack();
1427 break;
1428 case ISER_IB_RDMA_READ:
1429 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1430
1431 atomic_dec(&isert_conn->post_send_buf_count);
1432 isert_completion_rdma_read(tx_desc, isert_cmd);
1433 break;
1434 default:
1435 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1436 dump_stack();
1437 break;
1438 }
1439}
1440
1441static void
1442isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1443{
1444 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1445
1446 if (tx_desc) {
1447 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1448
1449 if (!isert_cmd)
1450 isert_unmap_tx_desc(tx_desc, ib_dev);
1451 else
1452 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1453 }
1454
1455 if (isert_conn->post_recv_buf_count == 0 &&
1456 atomic_read(&isert_conn->post_send_buf_count) == 0) {
1457 pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1458 pr_debug("Calling wake_up from isert_cq_comp_err\n");
1459
b2cb9649
NB		 1460 mutex_lock(&isert_conn->conn_mutex);
1461 if (isert_conn->state != ISER_CONN_DOWN)
1462 isert_conn->state = ISER_CONN_TERMINATING;
1463 mutex_unlock(&isert_conn->conn_mutex);
1464
b8d26b3b
NB		 1465 wake_up(&isert_conn->conn_wait_comp_err);
1466 }
1467}
1468
1469static void
1470isert_cq_tx_work(struct work_struct *work)
1471{
1472 struct isert_cq_desc *cq_desc = container_of(work,
1473 struct isert_cq_desc, cq_tx_work);
1474 struct isert_device *device = cq_desc->device;
1475 int cq_index = cq_desc->cq_index;
1476 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1477 struct isert_conn *isert_conn;
1478 struct iser_tx_desc *tx_desc;
1479 struct ib_wc wc;
1480
1481 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1482 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1483 isert_conn = wc.qp->qp_context;
1484
1485 if (wc.status == IB_WC_SUCCESS) {
1486 isert_send_completion(tx_desc, isert_conn);
1487 } else {
1488 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1489 pr_debug("TX wc.status: 0x%08x\n", wc.status);
c5a2adbf 1490 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
b8d26b3b
NB		 1491 atomic_dec(&isert_conn->post_send_buf_count);
1492 isert_cq_comp_err(tx_desc, isert_conn);
1493 }
1494 }
1495
1496 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1497}
1498
1499static void
1500isert_cq_tx_callback(struct ib_cq *cq, void *context)
1501{
1502 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1503
1504 INIT_WORK(&cq_desc->cq_tx_work, isert_cq_tx_work);
1505 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1506}
1507
1508static void
1509isert_cq_rx_work(struct work_struct *work)
1510{
1511 struct isert_cq_desc *cq_desc = container_of(work,
1512 struct isert_cq_desc, cq_rx_work);
1513 struct isert_device *device = cq_desc->device;
1514 int cq_index = cq_desc->cq_index;
1515 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1516 struct isert_conn *isert_conn;
1517 struct iser_rx_desc *rx_desc;
1518 struct ib_wc wc;
1519 unsigned long xfer_len;
1520
1521 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1522 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1523 isert_conn = wc.qp->qp_context;
1524
1525 if (wc.status == IB_WC_SUCCESS) {
1526 xfer_len = (unsigned long)wc.byte_len;
1527 isert_rx_completion(rx_desc, isert_conn, xfer_len);
1528 } else {
1529 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
c5a2adbf 1530 if (wc.status != IB_WC_WR_FLUSH_ERR) {
b8d26b3b 1531 pr_debug("RX wc.status: 0x%08x\n", wc.status);
c5a2adbf
NB		 1532 pr_debug("RX wc.vendor_err: 0x%08x\n",
1533 wc.vendor_err);
1534 }
b8d26b3b
NB		 1535 isert_conn->post_recv_buf_count--;
1536 isert_cq_comp_err(NULL, isert_conn);
1537 }
1538 }
1539
1540 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1541}
1542
1543static void
1544isert_cq_rx_callback(struct ib_cq *cq, void *context)
1545{
1546 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1547
1548 INIT_WORK(&cq_desc->cq_rx_work, isert_cq_rx_work);
1549 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1550}
1551
1552static int
1553isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1554{
1555 struct ib_send_wr *wr_failed;
1556 int ret;
1557
1558 atomic_inc(&isert_conn->post_send_buf_count);
1559
1560 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1561 &wr_failed);
1562 if (ret) {
1563 pr_err("ib_post_send failed with %d\n", ret);
1564 atomic_dec(&isert_conn->post_send_buf_count);
1565 return ret;
1566 }
1567 return ret;
1568}
1569
1570static int
1571isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1572{
1573 struct isert_cmd *isert_cmd = container_of(cmd,
1574 struct isert_cmd, iscsi_cmd);
1575 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1576 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1577 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1578 &isert_cmd->tx_desc.iscsi_header;
1579
1580 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1581 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1582 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1583 /*
1584 * Attach SENSE DATA payload to iSCSI Response PDU
1585 */
1586 if (cmd->se_cmd.sense_buffer &&
1587 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1588 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1589 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1590 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
dbbc5d11 1591 u32 padding, pdu_len;
b8d26b3b
NB		 1592
1593 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1594 cmd->sense_buffer);
1595 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1596
1597 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1598 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
dbbc5d11 1599 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
b8d26b3b 1600
dbbc5d11
NB		 1601 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1602 (void *)cmd->sense_buffer, pdu_len,
b8d26b3b
NB		 1603 DMA_TO_DEVICE);
1604
dbbc5d11
NB		 1605 isert_cmd->pdu_buf_len = pdu_len;
1606 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1607 tx_dsg->length = pdu_len;
b8d26b3b
NB		 1608 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1609 isert_cmd->tx_desc.num_sge = 2;
1610 }
1611
1612 isert_init_send_wr(isert_cmd, send_wr);
1613
1614 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1615
1616 return isert_post_response(isert_conn, isert_cmd);
1617}
1618
1619static int
1620isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1621 bool nopout_response)
1622{
1623 struct isert_cmd *isert_cmd = container_of(cmd,
1624 struct isert_cmd, iscsi_cmd);
1625 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1626 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1627
1628 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1629 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1630 &isert_cmd->tx_desc.iscsi_header,
1631 nopout_response);
1632 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1633 isert_init_send_wr(isert_cmd, send_wr);
1634
1635 pr_debug("Posting NOPIN Reponse IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1636
1637 return isert_post_response(isert_conn, isert_cmd);
1638}
1639
1640static int
1641isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1642{
1643 struct isert_cmd *isert_cmd = container_of(cmd,
1644 struct isert_cmd, iscsi_cmd);
1645 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1646 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1647
1648 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1649 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1650 &isert_cmd->tx_desc.iscsi_header);
1651 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1652 isert_init_send_wr(isert_cmd, send_wr);
1653
1654 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1655
1656 return isert_post_response(isert_conn, isert_cmd);
1657}
1658
1659static int
1660isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1661{
1662 struct isert_cmd *isert_cmd = container_of(cmd,
1663 struct isert_cmd, iscsi_cmd);
1664 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1665 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1666
1667 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1668 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1669 &isert_cmd->tx_desc.iscsi_header);
1670 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1671 isert_init_send_wr(isert_cmd, send_wr);
1672
1673 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1674
1675 return isert_post_response(isert_conn, isert_cmd);
1676}
1677
1678static int
1679isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1680{
1681 struct isert_cmd *isert_cmd = container_of(cmd,
1682 struct isert_cmd, iscsi_cmd);
1683 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1684 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
3df8f68a
NB		 1685 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1686 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1687 struct iscsi_reject *hdr =
1688 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
b8d26b3b
NB		 1689
1690 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
3df8f68a 1691 iscsit_build_reject(cmd, conn, hdr);
b8d26b3b 1692 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
3df8f68a
NB		 1693
1694 hton24(hdr->dlength, ISCSI_HDR_LEN);
dbbc5d11 1695 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
3df8f68a
NB		 1696 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1697 DMA_TO_DEVICE);
dbbc5d11
NB		 1698 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1699 tx_dsg->addr = isert_cmd->pdu_buf_dma;
3df8f68a
NB		 1700 tx_dsg->length = ISCSI_HDR_LEN;
1701 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1702 isert_cmd->tx_desc.num_sge = 2;
1703
b8d26b3b
NB		 1704 isert_init_send_wr(isert_cmd, send_wr);
1705
1706 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1707
1708 return isert_post_response(isert_conn, isert_cmd);
1709}
1710
1711static int
1712isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1713 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
1714 u32 data_left, u32 offset)
1715{
1716 struct iscsi_cmd *cmd = &isert_cmd->iscsi_cmd;
1717 struct scatterlist *sg_start, *tmp_sg;
1718 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1719 u32 sg_off, page_off;
1720 int i = 0, sg_nents;
1721
1722 sg_off = offset / PAGE_SIZE;
1723 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1724 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
1725 page_off = offset % PAGE_SIZE;
1726
1727 send_wr->sg_list = ib_sge;
1728 send_wr->num_sge = sg_nents;
1729 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
1730 /*
1731 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
1732 */
1733 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
1734 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
1735 (unsigned long long)tmp_sg->dma_address,
1736 tmp_sg->length, page_off);
1737
1738 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
1739 ib_sge->length = min_t(u32, data_left,
1740 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
1741 ib_sge->lkey = isert_conn->conn_mr->lkey;
1742
1743 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u\n",
1744 ib_sge->addr, ib_sge->length);
1745 page_off = 0;
1746 data_left -= ib_sge->length;
1747 ib_sge++;
1748 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
1749 }
1750
1751 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
1752 send_wr->sg_list, send_wr->num_sge);
1753
1754 return sg_nents;
1755}
1756
1757static int
1758isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1759{
1760 struct se_cmd *se_cmd = &cmd->se_cmd;
1761 struct isert_cmd *isert_cmd = container_of(cmd,
1762 struct isert_cmd, iscsi_cmd);
1763 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1764 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1765 struct ib_send_wr *wr_failed, *send_wr;
1766 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1767 struct ib_sge *ib_sge;
1768 struct scatterlist *sg;
1769 u32 offset = 0, data_len, data_left, rdma_write_max;
1770 int rc, ret = 0, count, sg_nents, i, ib_sge_cnt;
1771
1772 pr_debug("RDMA_WRITE: data_length: %u\n", se_cmd->data_length);
1773
1774 sg = &se_cmd->t_data_sg[0];
1775 sg_nents = se_cmd->t_data_nents;
1776
1777 count = ib_dma_map_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
1778 if (unlikely(!count)) {
1779 pr_err("Unable to map put_datain SGs\n");
1780 return -EINVAL;
1781 }
1782 wr->sge = sg;
1783 wr->num_sge = sg_nents;
1784 pr_debug("Mapped IB count: %u sg: %p sg_nents: %u for RDMA_WRITE\n",
1785 count, sg, sg_nents);
1786
1787 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
1788 if (!ib_sge) {
1789 pr_warn("Unable to allocate datain ib_sge\n");
1790 ret = -ENOMEM;
1791 goto unmap_sg;
1792 }
1793 isert_cmd->ib_sge = ib_sge;
1794
1795 pr_debug("Allocated ib_sge: %p from t_data_ents: %d for RDMA_WRITE\n",
1796 ib_sge, se_cmd->t_data_nents);
1797
1798 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
1799 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
1800 GFP_KERNEL);
1801 if (!wr->send_wr) {
1802 pr_err("Unable to allocate wr->send_wr\n");
1803 ret = -ENOMEM;
1804 goto unmap_sg;
1805 }
1806 pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
1807 wr->send_wr, wr->send_wr_num);
1808
1809 iscsit_increment_maxcmdsn(cmd, conn->sess);
1810 cmd->stat_sn = conn->stat_sn++;
1811
1812 wr->isert_cmd = isert_cmd;
1813 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
1814 data_left = se_cmd->data_length;
1815
1816 for (i = 0; i < wr->send_wr_num; i++) {
1817 send_wr = &isert_cmd->rdma_wr.send_wr[i];
1818 data_len = min(data_left, rdma_write_max);
1819
1820 send_wr->opcode = IB_WR_RDMA_WRITE;
1821 send_wr->send_flags = 0;
1822 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
1823 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
1824
1825 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
1826 send_wr, data_len, offset);
1827 ib_sge += ib_sge_cnt;
1828
1829 if (i + 1 == wr->send_wr_num)
1830 send_wr->next = &isert_cmd->tx_desc.send_wr;
1831 else
1832 send_wr->next = &wr->send_wr[i + 1];
1833
1834 offset += data_len;
1835 data_left -= data_len;
1836 }
1837 /*
1838 * Build isert_conn->tx_desc for iSCSI response PDU and attach
1839 */
1840 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1841 iscsit_build_rsp_pdu(cmd, conn, false, (struct iscsi_scsi_rsp *)
1842 &isert_cmd->tx_desc.iscsi_header);
1843 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1844 isert_init_send_wr(isert_cmd, &isert_cmd->tx_desc.send_wr);
1845
1846 atomic_inc(&isert_conn->post_send_buf_count);
1847
1848 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
1849 if (rc) {
1850 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
1851 atomic_dec(&isert_conn->post_send_buf_count);
1852 }
1853 pr_debug("Posted RDMA_WRITE + Response for iSER Data READ\n");
1854 return 1;
1855
1856unmap_sg:
1857 ib_dma_unmap_sg(ib_dev, sg, sg_nents, DMA_TO_DEVICE);
1858 return ret;
1859}
1860
1861static int
1862isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
1863{
1864 struct se_cmd *se_cmd = &cmd->se_cmd;
1865 struct isert_cmd *isert_cmd = container_of(cmd,
1866 struct isert_cmd, iscsi_cmd);
1867 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1868 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1869 struct ib_send_wr *wr_failed, *send_wr;
1870 struct ib_sge *ib_sge;
1871 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1872 struct scatterlist *sg_start;
1873 u32 sg_off, sg_nents, page_off, va_offset = 0;
1874 u32 offset = 0, data_len, data_left, rdma_write_max;
1875 int rc, ret = 0, count, i, ib_sge_cnt;
1876
1877 pr_debug("RDMA_READ: data_length: %u write_data_done: %u\n",
1878 se_cmd->data_length, cmd->write_data_done);
1879
1880 sg_off = cmd->write_data_done / PAGE_SIZE;
1881 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1882 page_off = cmd->write_data_done % PAGE_SIZE;
1883
1884 pr_debug("RDMA_READ: sg_off: %d, sg_start: %p page_off: %d\n",
1885 sg_off, sg_start, page_off);
1886
1887 data_left = se_cmd->data_length - cmd->write_data_done;
1888 sg_nents = se_cmd->t_data_nents - sg_off;
1889
1890 pr_debug("RDMA_READ: data_left: %d, sg_nents: %d\n",
1891 data_left, sg_nents);
1892
1893 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
1894 if (unlikely(!count)) {
1895 pr_err("Unable to map get_dataout SGs\n");
1896 return -EINVAL;
1897 }
1898 wr->sge = sg_start;
1899 wr->num_sge = sg_nents;
1900 pr_debug("Mapped IB count: %u sg_start: %p sg_nents: %u for RDMA_READ\n",
1901 count, sg_start, sg_nents);
1902
1903 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
1904 if (!ib_sge) {
1905 pr_warn("Unable to allocate dataout ib_sge\n");
1906 ret = -ENOMEM;
1907 goto unmap_sg;
1908 }
1909 isert_cmd->ib_sge = ib_sge;
1910
1911 pr_debug("Using ib_sge: %p from sg_ents: %d for RDMA_READ\n",
1912 ib_sge, sg_nents);
1913
1914 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
1915 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
1916 GFP_KERNEL);
1917 if (!wr->send_wr) {
1918 pr_debug("Unable to allocate wr->send_wr\n");
1919 ret = -ENOMEM;
1920 goto unmap_sg;
1921 }
1922 pr_debug("Allocated wr->send_wr: %p wr->send_wr_num: %u\n",
1923 wr->send_wr, wr->send_wr_num);
1924
1925 isert_cmd->tx_desc.isert_cmd = isert_cmd;
1926
1927 wr->iser_ib_op = ISER_IB_RDMA_READ;
1928 wr->isert_cmd = isert_cmd;
1929 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
1930 offset = cmd->write_data_done;
1931
1932 for (i = 0; i < wr->send_wr_num; i++) {
1933 send_wr = &isert_cmd->rdma_wr.send_wr[i];
1934 data_len = min(data_left, rdma_write_max);
1935
1936 send_wr->opcode = IB_WR_RDMA_READ;
1937 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
1938 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
1939
1940 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
1941 send_wr, data_len, offset);
1942 ib_sge += ib_sge_cnt;
1943
1944 if (i + 1 == wr->send_wr_num)
1945 send_wr->send_flags = IB_SEND_SIGNALED;
1946 else
1947 send_wr->next = &wr->send_wr[i + 1];
1948
1949 offset += data_len;
1950 va_offset += data_len;
1951 data_left -= data_len;
1952 }
1953
1954 atomic_inc(&isert_conn->post_send_buf_count);
1955
1956 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
1957 if (rc) {
1958 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
1959 atomic_dec(&isert_conn->post_send_buf_count);
1960 }
1961 pr_debug("Posted RDMA_READ memory for ISER Data WRITE\n");
1962 return 0;
1963
1964unmap_sg:
1965 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents, DMA_FROM_DEVICE);
1966 return ret;
1967}
1968
1969static int
1970isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
1971{
1972 int ret;
1973
1974 switch (state) {
1975 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
1976 ret = isert_put_nopin(cmd, conn, false);
1977 break;
1978 default:
1979 pr_err("Unknown immediate state: 0x%02x\n", state);
1980 ret = -EINVAL;
1981 break;
1982 }
1983
1984 return ret;
1985}
1986
1987static int
1988isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
1989{
1990 int ret;
1991
1992 switch (state) {
1993 case ISTATE_SEND_LOGOUTRSP:
1994 ret = isert_put_logout_rsp(cmd, conn);
1995 if (!ret) {
1996 pr_debug("Returning iSER Logout -EAGAIN\n");
1997 ret = -EAGAIN;
1998 }
1999 break;
2000 case ISTATE_SEND_NOPIN:
2001 ret = isert_put_nopin(cmd, conn, true);
2002 break;
2003 case ISTATE_SEND_TASKMGTRSP:
2004 ret = isert_put_tm_rsp(cmd, conn);
2005 break;
2006 case ISTATE_SEND_REJECT:
2007 ret = isert_put_reject(cmd, conn);
2008 break;
2009 case ISTATE_SEND_STATUS:
2010 /*
2011 * Special case for sending non GOOD SCSI status from TX thread
2012 * context during pre se_cmd excecution failure.
2013 */
2014 ret = isert_put_response(conn, cmd);
2015 break;
2016 default:
2017 pr_err("Unknown response state: 0x%02x\n", state);
2018 ret = -EINVAL;
2019 break;
2020 }
2021
2022 return ret;
2023}
2024
2025static int
2026isert_setup_np(struct iscsi_np *np,
2027 struct __kernel_sockaddr_storage *ksockaddr)
2028{
2029 struct isert_np *isert_np;
2030 struct rdma_cm_id *isert_lid;
2031 struct sockaddr *sa;
2032 int ret;
2033
2034 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2035 if (!isert_np) {
2036 pr_err("Unable to allocate struct isert_np\n");
2037 return -ENOMEM;
2038 }
2039 init_waitqueue_head(&isert_np->np_accept_wq);
2040 mutex_init(&isert_np->np_accept_mutex);
2041 INIT_LIST_HEAD(&isert_np->np_accept_list);
2042 init_completion(&isert_np->np_login_comp);
2043
2044 sa = (struct sockaddr *)ksockaddr;
2045 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2046 /*
2047 * Setup the np->np_sockaddr from the passed sockaddr setup
2048 * in iscsi_target_configfs.c code..
2049 */
2050 memcpy(&np->np_sockaddr, ksockaddr,
2051 sizeof(struct __kernel_sockaddr_storage));
2052
2053 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2054 IB_QPT_RC);
2055 if (IS_ERR(isert_lid)) {
2056 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2057 PTR_ERR(isert_lid));
2058 ret = PTR_ERR(isert_lid);
2059 goto out;
2060 }
2061
2062 ret = rdma_bind_addr(isert_lid, sa);
2063 if (ret) {
2064 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2065 goto out_lid;
2066 }
2067
2068 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2069 if (ret) {
2070 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2071 goto out_lid;
2072 }
2073
2074 isert_np->np_cm_id = isert_lid;
2075 np->np_context = isert_np;
2076 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2077
2078 return 0;
2079
2080out_lid:
2081 rdma_destroy_id(isert_lid);
2082out:
2083 kfree(isert_np);
2084 return ret;
2085}
2086
2087static int
2088isert_check_accept_queue(struct isert_np *isert_np)
2089{
2090 int empty;
2091
2092 mutex_lock(&isert_np->np_accept_mutex);
2093 empty = list_empty(&isert_np->np_accept_list);
2094 mutex_unlock(&isert_np->np_accept_mutex);
2095
2096 return empty;
2097}
2098
2099static int
2100isert_rdma_accept(struct isert_conn *isert_conn)
2101{
2102 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2103 struct rdma_conn_param cp;
2104 int ret;
2105
2106 memset(&cp, 0, sizeof(struct rdma_conn_param));
2107 cp.responder_resources = isert_conn->responder_resources;
2108 cp.initiator_depth = isert_conn->initiator_depth;
2109 cp.retry_count = 7;
2110 cp.rnr_retry_count = 7;
2111
2112 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2113
2114 ret = rdma_accept(cm_id, &cp);
2115 if (ret) {
2116 pr_err("rdma_accept() failed with: %d\n", ret);
2117 return ret;
2118 }
2119
2120 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2121
2122 return 0;
2123}
2124
2125static int
2126isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2127{
2128 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2129 int ret;
2130
2131 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2132
2133 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2134 if (ret)
2135 return ret;
2136
2137 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2138 return 0;
2139}
2140
2141static void
2142isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2143 struct isert_conn *isert_conn)
2144{
2145 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2146 struct rdma_route *cm_route = &cm_id->route;
2147 struct sockaddr_in *sock_in;
2148 struct sockaddr_in6 *sock_in6;
2149
2150 conn->login_family = np->np_sockaddr.ss_family;
2151
2152 if (np->np_sockaddr.ss_family == AF_INET6) {
2153 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2154 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2155 &sock_in6->sin6_addr.in6_u);
2156 conn->login_port = ntohs(sock_in6->sin6_port);
2157
2158 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2159 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2160 &sock_in6->sin6_addr.in6_u);
2161 conn->local_port = ntohs(sock_in6->sin6_port);
2162 } else {
2163 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2164 sprintf(conn->login_ip, "%pI4",
2165 &sock_in->sin_addr.s_addr);
2166 conn->login_port = ntohs(sock_in->sin_port);
2167
2168 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2169 sprintf(conn->local_ip, "%pI4",
2170 &sock_in->sin_addr.s_addr);
2171 conn->local_port = ntohs(sock_in->sin_port);
2172 }
2173}
2174
2175static int
2176isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2177{
2178 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2179 struct isert_conn *isert_conn;
2180 int max_accept = 0, ret;
2181
2182accept_wait:
2183 ret = wait_event_interruptible(isert_np->np_accept_wq,
2184 !isert_check_accept_queue(isert_np) ||
2185 np->np_thread_state == ISCSI_NP_THREAD_RESET);
2186 if (max_accept > 5)
2187 return -ENODEV;
2188
2189 spin_lock_bh(&np->np_thread_lock);
2190 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2191 spin_unlock_bh(&np->np_thread_lock);
2192 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2193 return -ENODEV;
2194 }
2195 spin_unlock_bh(&np->np_thread_lock);
2196
2197 mutex_lock(&isert_np->np_accept_mutex);
2198 if (list_empty(&isert_np->np_accept_list)) {
2199 mutex_unlock(&isert_np->np_accept_mutex);
2200 max_accept++;
2201 goto accept_wait;
2202 }
2203 isert_conn = list_first_entry(&isert_np->np_accept_list,
2204 struct isert_conn, conn_accept_node);
2205 list_del_init(&isert_conn->conn_accept_node);
2206 mutex_unlock(&isert_np->np_accept_mutex);
2207
2208 conn->context = isert_conn;
2209 isert_conn->conn = conn;
2210 max_accept = 0;
2211
2212 ret = isert_rdma_post_recvl(isert_conn);
2213 if (ret)
2214 return ret;
2215
2216 ret = isert_rdma_accept(isert_conn);
2217 if (ret)
2218 return ret;
2219
2220 isert_set_conn_info(np, conn, isert_conn);
2221
2222 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2223 return 0;
2224}
2225
2226static void
2227isert_free_np(struct iscsi_np *np)
2228{
2229 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2230
2231 rdma_destroy_id(isert_np->np_cm_id);
2232
2233 np->np_context = NULL;
2234 kfree(isert_np);
2235}
2236
b2cb9649
NB		 2237static int isert_check_state(struct isert_conn *isert_conn, int state)
2238{
2239 int ret;
2240
2241 mutex_lock(&isert_conn->conn_mutex);
2242 ret = (isert_conn->state == state);
2243 mutex_unlock(&isert_conn->conn_mutex);
2244
2245 return ret;
2246}
2247
b8d26b3b
NB		 2248static void isert_free_conn(struct iscsi_conn *conn)
2249{
2250 struct isert_conn *isert_conn = conn->context;
2251
2252 pr_debug("isert_free_conn: Starting \n");
2253 /*
2254 * Decrement post_send_buf_count for special case when called
2255 * from isert_do_control_comp() -> iscsit_logout_post_handler()
2256 */
b2cb9649 2257 mutex_lock(&isert_conn->conn_mutex);
b8d26b3b
NB		 2258 if (isert_conn->logout_posted)
2259 atomic_dec(&isert_conn->post_send_buf_count);
2260
b2cb9649
NB		 2261 if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
2262 pr_debug("Calling rdma_disconnect from isert_free_conn\n");
b8d26b3b 2263 rdma_disconnect(isert_conn->conn_cm_id);
b2cb9649 2264 }
b8d26b3b
NB		 2265 /*
2266 * Only wait for conn_wait_comp_err if the isert_conn made it
2267 * into full feature phase..
2268 */
b2cb9649 2269 if (isert_conn->state == ISER_CONN_UP) {
b8d26b3b
NB		 2270 pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
2271 isert_conn->state);
b2cb9649
NB		 2272 mutex_unlock(&isert_conn->conn_mutex);
2273
b8d26b3b 2274 wait_event(isert_conn->conn_wait_comp_err,
b2cb9649
NB		 2275 (isert_check_state(isert_conn, ISER_CONN_TERMINATING)));
2276
2277 wait_event(isert_conn->conn_wait,
2278 (isert_check_state(isert_conn, ISER_CONN_DOWN)));
2279
2280 isert_put_conn(isert_conn);
2281 return;
2282 }
2283 if (isert_conn->state == ISER_CONN_INIT) {
2284 mutex_unlock(&isert_conn->conn_mutex);
2285 isert_put_conn(isert_conn);
2286 return;
b8d26b3b 2287 }
b2cb9649
NB		 2288 pr_debug("isert_free_conn: wait_event conn_wait %d\n",
2289 isert_conn->state);
2290 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 2291
b2cb9649
NB		 2292 wait_event(isert_conn->conn_wait,
2293 (isert_check_state(isert_conn, ISER_CONN_DOWN)));
b8d26b3b
NB		 2294
2295 isert_put_conn(isert_conn);
2296}
2297
2298static struct iscsit_transport iser_target_transport = {
2299 .name = "IB/iSER",
2300 .transport_type = ISCSI_INFINIBAND,
2301 .owner = THIS_MODULE,
2302 .iscsit_setup_np = isert_setup_np,
2303 .iscsit_accept_np = isert_accept_np,
2304 .iscsit_free_np = isert_free_np,
2305 .iscsit_free_conn = isert_free_conn,
2306 .iscsit_alloc_cmd = isert_alloc_cmd,
2307 .iscsit_get_login_rx = isert_get_login_rx,
2308 .iscsit_put_login_tx = isert_put_login_tx,
2309 .iscsit_immediate_queue = isert_immediate_queue,
2310 .iscsit_response_queue = isert_response_queue,
2311 .iscsit_get_dataout = isert_get_dataout,
2312 .iscsit_queue_data_in = isert_put_datain,
2313 .iscsit_queue_status = isert_put_response,
2314};
2315
2316static int __init isert_init(void)
2317{
2318 int ret;
2319
2320 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2321 if (!isert_rx_wq) {
2322 pr_err("Unable to allocate isert_rx_wq\n");
2323 return -ENOMEM;
2324 }
2325
2326 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2327 if (!isert_comp_wq) {
2328 pr_err("Unable to allocate isert_comp_wq\n");
2329 ret = -ENOMEM;
2330 goto destroy_rx_wq;
2331 }
2332
2333 isert_cmd_cache = kmem_cache_create("isert_cmd_cache",
2334 sizeof(struct isert_cmd), __alignof__(struct isert_cmd),
2335 0, NULL);
2336 if (!isert_cmd_cache) {
2337 pr_err("Unable to create isert_cmd_cache\n");
2338 ret = -ENOMEM;
2339 goto destroy_tx_cq;
2340 }
2341
2342 iscsit_register_transport(&iser_target_transport);
2343 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2344 return 0;
2345
2346destroy_tx_cq:
2347 destroy_workqueue(isert_comp_wq);
2348destroy_rx_wq:
2349 destroy_workqueue(isert_rx_wq);
2350 return ret;
2351}
2352
2353static void __exit isert_exit(void)
2354{
2355 kmem_cache_destroy(isert_cmd_cache);
2356 destroy_workqueue(isert_comp_wq);
2357 destroy_workqueue(isert_rx_wq);
2358 iscsit_unregister_transport(&iser_target_transport);
2359 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2360}
2361
2362MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2363MODULE_VERSION("0.1");
2364MODULE_AUTHOR("nab@Linux-iSCSI.org");
2365MODULE_LICENSE("GPL");
2366
2367module_init(isert_init);
2368module_exit(isert_exit);
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