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iser-target: Fix leak on failure in isert_conn_create_fastreg_pool
[deliverable/linux.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
23 #include <linux/in.h>
24 #include <linux/in6.h>
25 #include <linux/llist.h>
26 #include <rdma/ib_verbs.h>
27 #include <rdma/rdma_cm.h>
28 #include <target/target_core_base.h>
29 #include <target/target_core_fabric.h>
30 #include <target/iscsi/iscsi_transport.h>
31
32 #include "isert_proto.h"
33 #include "ib_isert.h"
34
35 #define ISERT_MAX_CONN 8
36 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
37 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
38
39 static DEFINE_MUTEX(device_list_mutex);
40 static LIST_HEAD(device_list);
41 static struct workqueue_struct *isert_rx_wq;
42 static struct workqueue_struct *isert_comp_wq;
43
44 static void
45 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
46 static int
47 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
48 struct isert_rdma_wr *wr);
49 static void
50 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
51 static int
52 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
53 struct isert_rdma_wr *wr);
54
55 static void
56 isert_qp_event_callback(struct ib_event *e, void *context)
57 {
58 struct isert_conn *isert_conn = (struct isert_conn *)context;
59
60 pr_err("isert_qp_event_callback event: %d\n", e->event);
61 switch (e->event) {
62 case IB_EVENT_COMM_EST:
63 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
64 break;
65 case IB_EVENT_QP_LAST_WQE_REACHED:
66 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
67 break;
68 default:
69 break;
70 }
71 }
72
73 static int
74 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
75 {
76 int ret;
77
78 ret = ib_query_device(ib_dev, devattr);
79 if (ret) {
80 pr_err("ib_query_device() failed: %d\n", ret);
81 return ret;
82 }
83 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
84 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
85
86 return 0;
87 }
88
89 static int
90 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
91 {
92 struct isert_device *device = isert_conn->conn_device;
93 struct ib_qp_init_attr attr;
94 int ret, index, min_index = 0;
95
96 mutex_lock(&device_list_mutex);
97 for (index = 0; index < device->cqs_used; index++)
98 if (device->cq_active_qps[index] <
99 device->cq_active_qps[min_index])
100 min_index = index;
101 device->cq_active_qps[min_index]++;
102 pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
103 mutex_unlock(&device_list_mutex);
104
105 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
106 attr.event_handler = isert_qp_event_callback;
107 attr.qp_context = isert_conn;
108 attr.send_cq = device->dev_tx_cq[min_index];
109 attr.recv_cq = device->dev_rx_cq[min_index];
110 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
111 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
112 /*
113 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
114 * work-around for RDMA_READ..
115 */
116 attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
117 isert_conn->max_sge = attr.cap.max_send_sge;
118
119 attr.cap.max_recv_sge = 1;
120 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
121 attr.qp_type = IB_QPT_RC;
122
123 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
124 cma_id->device);
125 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
126 isert_conn->conn_pd->device);
127
128 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
129 if (ret) {
130 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
131 return ret;
132 }
133 isert_conn->conn_qp = cma_id->qp;
134 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
135
136 return 0;
137 }
138
139 static void
140 isert_cq_event_callback(struct ib_event *e, void *context)
141 {
142 pr_debug("isert_cq_event_callback event: %d\n", e->event);
143 }
144
145 static int
146 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
147 {
148 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
149 struct iser_rx_desc *rx_desc;
150 struct ib_sge *rx_sg;
151 u64 dma_addr;
152 int i, j;
153
154 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
155 sizeof(struct iser_rx_desc), GFP_KERNEL);
156 if (!isert_conn->conn_rx_descs)
157 goto fail;
158
159 rx_desc = isert_conn->conn_rx_descs;
160
161 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
162 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
163 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
164 if (ib_dma_mapping_error(ib_dev, dma_addr))
165 goto dma_map_fail;
166
167 rx_desc->dma_addr = dma_addr;
168
169 rx_sg = &rx_desc->rx_sg;
170 rx_sg->addr = rx_desc->dma_addr;
171 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
172 rx_sg->lkey = isert_conn->conn_mr->lkey;
173 }
174
175 isert_conn->conn_rx_desc_head = 0;
176 return 0;
177
178 dma_map_fail:
179 rx_desc = isert_conn->conn_rx_descs;
180 for (j = 0; j < i; j++, rx_desc++) {
181 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
182 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
183 }
184 kfree(isert_conn->conn_rx_descs);
185 isert_conn->conn_rx_descs = NULL;
186 fail:
187 return -ENOMEM;
188 }
189
190 static void
191 isert_free_rx_descriptors(struct isert_conn *isert_conn)
192 {
193 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
194 struct iser_rx_desc *rx_desc;
195 int i;
196
197 if (!isert_conn->conn_rx_descs)
198 return;
199
200 rx_desc = isert_conn->conn_rx_descs;
201 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
202 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
203 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
204 }
205
206 kfree(isert_conn->conn_rx_descs);
207 isert_conn->conn_rx_descs = NULL;
208 }
209
210 static void isert_cq_tx_work(struct work_struct *);
211 static void isert_cq_tx_callback(struct ib_cq *, void *);
212 static void isert_cq_rx_work(struct work_struct *);
213 static void isert_cq_rx_callback(struct ib_cq *, void *);
214
215 static int
216 isert_create_device_ib_res(struct isert_device *device)
217 {
218 struct ib_device *ib_dev = device->ib_device;
219 struct isert_cq_desc *cq_desc;
220 struct ib_device_attr *dev_attr;
221 int ret = 0, i, j;
222
223 dev_attr = &device->dev_attr;
224 ret = isert_query_device(ib_dev, dev_attr);
225 if (ret)
226 return ret;
227
228 /* asign function handlers */
229 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
230 device->use_fastreg = 1;
231 device->reg_rdma_mem = isert_reg_rdma;
232 device->unreg_rdma_mem = isert_unreg_rdma;
233 } else {
234 device->use_fastreg = 0;
235 device->reg_rdma_mem = isert_map_rdma;
236 device->unreg_rdma_mem = isert_unmap_cmd;
237 }
238
239 device->cqs_used = min_t(int, num_online_cpus(),
240 device->ib_device->num_comp_vectors);
241 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
242 pr_debug("Using %d CQs, device %s supports %d vectors support "
243 "Fast registration %d\n",
244 device->cqs_used, device->ib_device->name,
245 device->ib_device->num_comp_vectors, device->use_fastreg);
246 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
247 device->cqs_used, GFP_KERNEL);
248 if (!device->cq_desc) {
249 pr_err("Unable to allocate device->cq_desc\n");
250 return -ENOMEM;
251 }
252 cq_desc = device->cq_desc;
253
254 for (i = 0; i < device->cqs_used; i++) {
255 cq_desc[i].device = device;
256 cq_desc[i].cq_index = i;
257
258 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
259 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
260 isert_cq_rx_callback,
261 isert_cq_event_callback,
262 (void *)&cq_desc[i],
263 ISER_MAX_RX_CQ_LEN, i);
264 if (IS_ERR(device->dev_rx_cq[i])) {
265 ret = PTR_ERR(device->dev_rx_cq[i]);
266 device->dev_rx_cq[i] = NULL;
267 goto out_cq;
268 }
269
270 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
271 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
272 isert_cq_tx_callback,
273 isert_cq_event_callback,
274 (void *)&cq_desc[i],
275 ISER_MAX_TX_CQ_LEN, i);
276 if (IS_ERR(device->dev_tx_cq[i])) {
277 ret = PTR_ERR(device->dev_tx_cq[i]);
278 device->dev_tx_cq[i] = NULL;
279 goto out_cq;
280 }
281
282 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
283 if (ret)
284 goto out_cq;
285
286 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
287 if (ret)
288 goto out_cq;
289 }
290
291 return 0;
292
293 out_cq:
294 for (j = 0; j < i; j++) {
295 cq_desc = &device->cq_desc[j];
296
297 if (device->dev_rx_cq[j]) {
298 cancel_work_sync(&cq_desc->cq_rx_work);
299 ib_destroy_cq(device->dev_rx_cq[j]);
300 }
301 if (device->dev_tx_cq[j]) {
302 cancel_work_sync(&cq_desc->cq_tx_work);
303 ib_destroy_cq(device->dev_tx_cq[j]);
304 }
305 }
306 kfree(device->cq_desc);
307
308 return ret;
309 }
310
311 static void
312 isert_free_device_ib_res(struct isert_device *device)
313 {
314 struct isert_cq_desc *cq_desc;
315 int i;
316
317 for (i = 0; i < device->cqs_used; i++) {
318 cq_desc = &device->cq_desc[i];
319
320 cancel_work_sync(&cq_desc->cq_rx_work);
321 cancel_work_sync(&cq_desc->cq_tx_work);
322 ib_destroy_cq(device->dev_rx_cq[i]);
323 ib_destroy_cq(device->dev_tx_cq[i]);
324 device->dev_rx_cq[i] = NULL;
325 device->dev_tx_cq[i] = NULL;
326 }
327
328 kfree(device->cq_desc);
329 }
330
331 static void
332 isert_device_try_release(struct isert_device *device)
333 {
334 mutex_lock(&device_list_mutex);
335 device->refcount--;
336 if (!device->refcount) {
337 isert_free_device_ib_res(device);
338 list_del(&device->dev_node);
339 kfree(device);
340 }
341 mutex_unlock(&device_list_mutex);
342 }
343
344 static struct isert_device *
345 isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
346 {
347 struct isert_device *device;
348 int ret;
349
350 mutex_lock(&device_list_mutex);
351 list_for_each_entry(device, &device_list, dev_node) {
352 if (device->ib_device->node_guid == cma_id->device->node_guid) {
353 device->refcount++;
354 mutex_unlock(&device_list_mutex);
355 return device;
356 }
357 }
358
359 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
360 if (!device) {
361 mutex_unlock(&device_list_mutex);
362 return ERR_PTR(-ENOMEM);
363 }
364
365 INIT_LIST_HEAD(&device->dev_node);
366
367 device->ib_device = cma_id->device;
368 ret = isert_create_device_ib_res(device);
369 if (ret) {
370 kfree(device);
371 mutex_unlock(&device_list_mutex);
372 return ERR_PTR(ret);
373 }
374
375 device->refcount++;
376 list_add_tail(&device->dev_node, &device_list);
377 mutex_unlock(&device_list_mutex);
378
379 return device;
380 }
381
382 static void
383 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
384 {
385 struct fast_reg_descriptor *fr_desc, *tmp;
386 int i = 0;
387
388 if (list_empty(&isert_conn->conn_fr_pool))
389 return;
390
391 pr_debug("Freeing conn %p fastreg pool", isert_conn);
392
393 list_for_each_entry_safe(fr_desc, tmp,
394 &isert_conn->conn_fr_pool, list) {
395 list_del(&fr_desc->list);
396 ib_free_fast_reg_page_list(fr_desc->data_frpl);
397 ib_dereg_mr(fr_desc->data_mr);
398 kfree(fr_desc);
399 ++i;
400 }
401
402 if (i < isert_conn->conn_fr_pool_size)
403 pr_warn("Pool still has %d regions registered\n",
404 isert_conn->conn_fr_pool_size - i);
405 }
406
407 static int
408 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
409 struct fast_reg_descriptor *fr_desc)
410 {
411 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
412 ISCSI_ISER_SG_TABLESIZE);
413 if (IS_ERR(fr_desc->data_frpl)) {
414 pr_err("Failed to allocate data frpl err=%ld\n",
415 PTR_ERR(fr_desc->data_frpl));
416 return PTR_ERR(fr_desc->data_frpl);
417 }
418
419 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
420 if (IS_ERR(fr_desc->data_mr)) {
421 pr_err("Failed to allocate data frmr err=%ld\n",
422 PTR_ERR(fr_desc->data_mr));
423 ib_free_fast_reg_page_list(fr_desc->data_frpl);
424 return PTR_ERR(fr_desc->data_mr);
425 }
426 pr_debug("Create fr_desc %p page_list %p\n",
427 fr_desc, fr_desc->data_frpl->page_list);
428
429 fr_desc->valid = true;
430
431 return 0;
432 }
433
434 static int
435 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
436 {
437 struct fast_reg_descriptor *fr_desc;
438 struct isert_device *device = isert_conn->conn_device;
439 int i, ret;
440
441 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
442 isert_conn->conn_fr_pool_size = 0;
443 for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
444 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
445 if (!fr_desc) {
446 pr_err("Failed to allocate fast_reg descriptor\n");
447 ret = -ENOMEM;
448 goto err;
449 }
450
451 ret = isert_create_fr_desc(device->ib_device,
452 isert_conn->conn_pd, fr_desc);
453 if (ret) {
454 pr_err("Failed to create fastreg descriptor err=%d\n",
455 ret);
456 kfree(fr_desc);
457 goto err;
458 }
459
460 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
461 isert_conn->conn_fr_pool_size++;
462 }
463
464 pr_debug("Creating conn %p fastreg pool size=%d",
465 isert_conn, isert_conn->conn_fr_pool_size);
466
467 return 0;
468
469 err:
470 isert_conn_free_fastreg_pool(isert_conn);
471 return ret;
472 }
473
474 static int
475 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
476 {
477 struct iscsi_np *np = cma_id->context;
478 struct isert_np *isert_np = np->np_context;
479 struct isert_conn *isert_conn;
480 struct isert_device *device;
481 struct ib_device *ib_dev = cma_id->device;
482 int ret = 0;
483
484 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
485 cma_id, cma_id->context);
486
487 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
488 if (!isert_conn) {
489 pr_err("Unable to allocate isert_conn\n");
490 return -ENOMEM;
491 }
492 isert_conn->state = ISER_CONN_INIT;
493 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
494 init_completion(&isert_conn->conn_login_comp);
495 init_waitqueue_head(&isert_conn->conn_wait);
496 init_waitqueue_head(&isert_conn->conn_wait_comp_err);
497 kref_init(&isert_conn->conn_kref);
498 kref_get(&isert_conn->conn_kref);
499 mutex_init(&isert_conn->conn_mutex);
500 mutex_init(&isert_conn->conn_comp_mutex);
501 spin_lock_init(&isert_conn->conn_lock);
502
503 cma_id->context = isert_conn;
504 isert_conn->conn_cm_id = cma_id;
505 isert_conn->responder_resources = event->param.conn.responder_resources;
506 isert_conn->initiator_depth = event->param.conn.initiator_depth;
507 pr_debug("Using responder_resources: %u initiator_depth: %u\n",
508 isert_conn->responder_resources, isert_conn->initiator_depth);
509
510 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
511 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
512 if (!isert_conn->login_buf) {
513 pr_err("Unable to allocate isert_conn->login_buf\n");
514 ret = -ENOMEM;
515 goto out;
516 }
517
518 isert_conn->login_req_buf = isert_conn->login_buf;
519 isert_conn->login_rsp_buf = isert_conn->login_buf +
520 ISCSI_DEF_MAX_RECV_SEG_LEN;
521 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
522 isert_conn->login_buf, isert_conn->login_req_buf,
523 isert_conn->login_rsp_buf);
524
525 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
526 (void *)isert_conn->login_req_buf,
527 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
528
529 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
530 if (ret) {
531 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
532 ret);
533 isert_conn->login_req_dma = 0;
534 goto out_login_buf;
535 }
536
537 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
538 (void *)isert_conn->login_rsp_buf,
539 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
540
541 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
542 if (ret) {
543 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
544 ret);
545 isert_conn->login_rsp_dma = 0;
546 goto out_req_dma_map;
547 }
548
549 device = isert_device_find_by_ib_dev(cma_id);
550 if (IS_ERR(device)) {
551 ret = PTR_ERR(device);
552 goto out_rsp_dma_map;
553 }
554
555 isert_conn->conn_device = device;
556 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
557 if (IS_ERR(isert_conn->conn_pd)) {
558 ret = PTR_ERR(isert_conn->conn_pd);
559 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
560 isert_conn, ret);
561 goto out_pd;
562 }
563
564 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
565 IB_ACCESS_LOCAL_WRITE);
566 if (IS_ERR(isert_conn->conn_mr)) {
567 ret = PTR_ERR(isert_conn->conn_mr);
568 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
569 isert_conn, ret);
570 goto out_mr;
571 }
572
573 if (device->use_fastreg) {
574 ret = isert_conn_create_fastreg_pool(isert_conn);
575 if (ret) {
576 pr_err("Conn: %p failed to create fastreg pool\n",
577 isert_conn);
578 goto out_fastreg;
579 }
580 }
581
582 ret = isert_conn_setup_qp(isert_conn, cma_id);
583 if (ret)
584 goto out_conn_dev;
585
586 mutex_lock(&isert_np->np_accept_mutex);
587 list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
588 mutex_unlock(&isert_np->np_accept_mutex);
589
590 pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
591 wake_up(&isert_np->np_accept_wq);
592 return 0;
593
594 out_conn_dev:
595 if (device->use_fastreg)
596 isert_conn_free_fastreg_pool(isert_conn);
597 out_fastreg:
598 ib_dereg_mr(isert_conn->conn_mr);
599 out_mr:
600 ib_dealloc_pd(isert_conn->conn_pd);
601 out_pd:
602 isert_device_try_release(device);
603 out_rsp_dma_map:
604 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
605 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
606 out_req_dma_map:
607 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
608 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
609 out_login_buf:
610 kfree(isert_conn->login_buf);
611 out:
612 kfree(isert_conn);
613 return ret;
614 }
615
616 static void
617 isert_connect_release(struct isert_conn *isert_conn)
618 {
619 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
620 struct isert_device *device = isert_conn->conn_device;
621 int cq_index;
622
623 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
624
625 if (device && device->use_fastreg)
626 isert_conn_free_fastreg_pool(isert_conn);
627
628 if (isert_conn->conn_qp) {
629 cq_index = ((struct isert_cq_desc *)
630 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
631 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
632 isert_conn->conn_device->cq_active_qps[cq_index]--;
633
634 rdma_destroy_qp(isert_conn->conn_cm_id);
635 }
636
637 isert_free_rx_descriptors(isert_conn);
638 rdma_destroy_id(isert_conn->conn_cm_id);
639
640 ib_dereg_mr(isert_conn->conn_mr);
641 ib_dealloc_pd(isert_conn->conn_pd);
642
643 if (isert_conn->login_buf) {
644 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
645 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
646 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
647 ISCSI_DEF_MAX_RECV_SEG_LEN,
648 DMA_FROM_DEVICE);
649 kfree(isert_conn->login_buf);
650 }
651 kfree(isert_conn);
652
653 if (device)
654 isert_device_try_release(device);
655
656 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
657 }
658
659 static void
660 isert_connected_handler(struct rdma_cm_id *cma_id)
661 {
662 return;
663 }
664
665 static void
666 isert_release_conn_kref(struct kref *kref)
667 {
668 struct isert_conn *isert_conn = container_of(kref,
669 struct isert_conn, conn_kref);
670
671 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
672 current->comm, current->pid);
673
674 isert_connect_release(isert_conn);
675 }
676
677 static void
678 isert_put_conn(struct isert_conn *isert_conn)
679 {
680 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
681 }
682
683 static void
684 isert_disconnect_work(struct work_struct *work)
685 {
686 struct isert_conn *isert_conn = container_of(work,
687 struct isert_conn, conn_logout_work);
688
689 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
690 mutex_lock(&isert_conn->conn_mutex);
691 isert_conn->state = ISER_CONN_DOWN;
692
693 if (isert_conn->post_recv_buf_count == 0 &&
694 atomic_read(&isert_conn->post_send_buf_count) == 0) {
695 pr_debug("Calling wake_up(&isert_conn->conn_wait);\n");
696 mutex_unlock(&isert_conn->conn_mutex);
697 goto wake_up;
698 }
699 if (!isert_conn->conn_cm_id) {
700 mutex_unlock(&isert_conn->conn_mutex);
701 isert_put_conn(isert_conn);
702 return;
703 }
704 if (!isert_conn->logout_posted) {
705 pr_debug("Calling rdma_disconnect for !logout_posted from"
706 " isert_disconnect_work\n");
707 rdma_disconnect(isert_conn->conn_cm_id);
708 mutex_unlock(&isert_conn->conn_mutex);
709 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
710 goto wake_up;
711 }
712 mutex_unlock(&isert_conn->conn_mutex);
713
714 wake_up:
715 wake_up(&isert_conn->conn_wait);
716 isert_put_conn(isert_conn);
717 }
718
719 static void
720 isert_disconnected_handler(struct rdma_cm_id *cma_id)
721 {
722 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
723
724 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
725 schedule_work(&isert_conn->conn_logout_work);
726 }
727
728 static int
729 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
730 {
731 int ret = 0;
732
733 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
734 event->event, event->status, cma_id->context, cma_id);
735
736 switch (event->event) {
737 case RDMA_CM_EVENT_CONNECT_REQUEST:
738 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
739 ret = isert_connect_request(cma_id, event);
740 break;
741 case RDMA_CM_EVENT_ESTABLISHED:
742 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
743 isert_connected_handler(cma_id);
744 break;
745 case RDMA_CM_EVENT_DISCONNECTED:
746 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
747 isert_disconnected_handler(cma_id);
748 break;
749 case RDMA_CM_EVENT_DEVICE_REMOVAL:
750 case RDMA_CM_EVENT_ADDR_CHANGE:
751 break;
752 case RDMA_CM_EVENT_CONNECT_ERROR:
753 default:
754 pr_err("Unknown RDMA CMA event: %d\n", event->event);
755 break;
756 }
757
758 if (ret != 0) {
759 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
760 event->event, ret);
761 dump_stack();
762 }
763
764 return ret;
765 }
766
767 static int
768 isert_post_recv(struct isert_conn *isert_conn, u32 count)
769 {
770 struct ib_recv_wr *rx_wr, *rx_wr_failed;
771 int i, ret;
772 unsigned int rx_head = isert_conn->conn_rx_desc_head;
773 struct iser_rx_desc *rx_desc;
774
775 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
776 rx_desc = &isert_conn->conn_rx_descs[rx_head];
777 rx_wr->wr_id = (unsigned long)rx_desc;
778 rx_wr->sg_list = &rx_desc->rx_sg;
779 rx_wr->num_sge = 1;
780 rx_wr->next = rx_wr + 1;
781 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
782 }
783
784 rx_wr--;
785 rx_wr->next = NULL; /* mark end of work requests list */
786
787 isert_conn->post_recv_buf_count += count;
788 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
789 &rx_wr_failed);
790 if (ret) {
791 pr_err("ib_post_recv() failed with ret: %d\n", ret);
792 isert_conn->post_recv_buf_count -= count;
793 } else {
794 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
795 isert_conn->conn_rx_desc_head = rx_head;
796 }
797 return ret;
798 }
799
800 static int
801 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
802 {
803 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
804 struct ib_send_wr send_wr, *send_wr_failed;
805 int ret;
806
807 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
808 ISER_HEADERS_LEN, DMA_TO_DEVICE);
809
810 send_wr.next = NULL;
811 send_wr.wr_id = (unsigned long)tx_desc;
812 send_wr.sg_list = tx_desc->tx_sg;
813 send_wr.num_sge = tx_desc->num_sge;
814 send_wr.opcode = IB_WR_SEND;
815 send_wr.send_flags = IB_SEND_SIGNALED;
816
817 atomic_inc(&isert_conn->post_send_buf_count);
818
819 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
820 if (ret) {
821 pr_err("ib_post_send() failed, ret: %d\n", ret);
822 atomic_dec(&isert_conn->post_send_buf_count);
823 }
824
825 return ret;
826 }
827
828 static void
829 isert_create_send_desc(struct isert_conn *isert_conn,
830 struct isert_cmd *isert_cmd,
831 struct iser_tx_desc *tx_desc)
832 {
833 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
834
835 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
836 ISER_HEADERS_LEN, DMA_TO_DEVICE);
837
838 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
839 tx_desc->iser_header.flags = ISER_VER;
840
841 tx_desc->num_sge = 1;
842 tx_desc->isert_cmd = isert_cmd;
843
844 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
845 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
846 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
847 }
848 }
849
850 static int
851 isert_init_tx_hdrs(struct isert_conn *isert_conn,
852 struct iser_tx_desc *tx_desc)
853 {
854 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
855 u64 dma_addr;
856
857 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
858 ISER_HEADERS_LEN, DMA_TO_DEVICE);
859 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
860 pr_err("ib_dma_mapping_error() failed\n");
861 return -ENOMEM;
862 }
863
864 tx_desc->dma_addr = dma_addr;
865 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
866 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
867 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
868
869 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
870 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
871 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
872
873 return 0;
874 }
875
876 static void
877 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
878 struct ib_send_wr *send_wr, bool coalesce)
879 {
880 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
881
882 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
883 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
884 send_wr->opcode = IB_WR_SEND;
885 send_wr->sg_list = &tx_desc->tx_sg[0];
886 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
887 /*
888 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
889 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
890 */
891 mutex_lock(&isert_conn->conn_comp_mutex);
892 if (coalesce &&
893 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
894 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
895 mutex_unlock(&isert_conn->conn_comp_mutex);
896 return;
897 }
898 isert_conn->conn_comp_batch = 0;
899 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
900 mutex_unlock(&isert_conn->conn_comp_mutex);
901
902 send_wr->send_flags = IB_SEND_SIGNALED;
903 }
904
905 static int
906 isert_rdma_post_recvl(struct isert_conn *isert_conn)
907 {
908 struct ib_recv_wr rx_wr, *rx_wr_fail;
909 struct ib_sge sge;
910 int ret;
911
912 memset(&sge, 0, sizeof(struct ib_sge));
913 sge.addr = isert_conn->login_req_dma;
914 sge.length = ISER_RX_LOGIN_SIZE;
915 sge.lkey = isert_conn->conn_mr->lkey;
916
917 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
918 sge.addr, sge.length, sge.lkey);
919
920 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
921 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
922 rx_wr.sg_list = &sge;
923 rx_wr.num_sge = 1;
924
925 isert_conn->post_recv_buf_count++;
926 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
927 if (ret) {
928 pr_err("ib_post_recv() failed: %d\n", ret);
929 isert_conn->post_recv_buf_count--;
930 }
931
932 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
933 return ret;
934 }
935
936 static int
937 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
938 u32 length)
939 {
940 struct isert_conn *isert_conn = conn->context;
941 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
942 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
943 int ret;
944
945 isert_create_send_desc(isert_conn, NULL, tx_desc);
946
947 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
948 sizeof(struct iscsi_hdr));
949
950 isert_init_tx_hdrs(isert_conn, tx_desc);
951
952 if (length > 0) {
953 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
954
955 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
956 length, DMA_TO_DEVICE);
957
958 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
959
960 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
961 length, DMA_TO_DEVICE);
962
963 tx_dsg->addr = isert_conn->login_rsp_dma;
964 tx_dsg->length = length;
965 tx_dsg->lkey = isert_conn->conn_mr->lkey;
966 tx_desc->num_sge = 2;
967 }
968 if (!login->login_failed) {
969 if (login->login_complete) {
970 ret = isert_alloc_rx_descriptors(isert_conn);
971 if (ret)
972 return ret;
973
974 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
975 if (ret)
976 return ret;
977
978 isert_conn->state = ISER_CONN_UP;
979 goto post_send;
980 }
981
982 ret = isert_rdma_post_recvl(isert_conn);
983 if (ret)
984 return ret;
985 }
986 post_send:
987 ret = isert_post_send(isert_conn, tx_desc);
988 if (ret)
989 return ret;
990
991 return 0;
992 }
993
994 static void
995 isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
996 struct isert_conn *isert_conn)
997 {
998 struct iscsi_conn *conn = isert_conn->conn;
999 struct iscsi_login *login = conn->conn_login;
1000 int size;
1001
1002 if (!login) {
1003 pr_err("conn->conn_login is NULL\n");
1004 dump_stack();
1005 return;
1006 }
1007
1008 if (login->first_request) {
1009 struct iscsi_login_req *login_req =
1010 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1011 /*
1012 * Setup the initial iscsi_login values from the leading
1013 * login request PDU.
1014 */
1015 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1016 login->current_stage =
1017 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1018 >> 2;
1019 login->version_min = login_req->min_version;
1020 login->version_max = login_req->max_version;
1021 memcpy(login->isid, login_req->isid, 6);
1022 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1023 login->init_task_tag = login_req->itt;
1024 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1025 login->cid = be16_to_cpu(login_req->cid);
1026 login->tsih = be16_to_cpu(login_req->tsih);
1027 }
1028
1029 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1030
1031 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1032 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1033 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1034 memcpy(login->req_buf, &rx_desc->data[0], size);
1035
1036 if (login->first_request) {
1037 complete(&isert_conn->conn_login_comp);
1038 return;
1039 }
1040 schedule_delayed_work(&conn->login_work, 0);
1041 }
1042
1043 static struct iscsi_cmd
1044 *isert_allocate_cmd(struct iscsi_conn *conn)
1045 {
1046 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1047 struct isert_cmd *isert_cmd;
1048 struct iscsi_cmd *cmd;
1049
1050 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1051 if (!cmd) {
1052 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1053 return NULL;
1054 }
1055 isert_cmd = iscsit_priv_cmd(cmd);
1056 isert_cmd->conn = isert_conn;
1057 isert_cmd->iscsi_cmd = cmd;
1058
1059 return cmd;
1060 }
1061
1062 static int
1063 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1064 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1065 struct iser_rx_desc *rx_desc, unsigned char *buf)
1066 {
1067 struct iscsi_conn *conn = isert_conn->conn;
1068 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1069 struct scatterlist *sg;
1070 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1071 bool dump_payload = false;
1072
1073 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1074 if (rc < 0)
1075 return rc;
1076
1077 imm_data = cmd->immediate_data;
1078 imm_data_len = cmd->first_burst_len;
1079 unsol_data = cmd->unsolicited_data;
1080
1081 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1082 if (rc < 0) {
1083 return 0;
1084 } else if (rc > 0) {
1085 dump_payload = true;
1086 goto sequence_cmd;
1087 }
1088
1089 if (!imm_data)
1090 return 0;
1091
1092 sg = &cmd->se_cmd.t_data_sg[0];
1093 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1094
1095 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1096 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1097
1098 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1099
1100 cmd->write_data_done += imm_data_len;
1101
1102 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1103 spin_lock_bh(&cmd->istate_lock);
1104 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1105 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1106 spin_unlock_bh(&cmd->istate_lock);
1107 }
1108
1109 sequence_cmd:
1110 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1111
1112 if (!rc && dump_payload == false && unsol_data)
1113 iscsit_set_unsoliticed_dataout(cmd);
1114
1115 return 0;
1116 }
1117
1118 static int
1119 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1120 struct iser_rx_desc *rx_desc, unsigned char *buf)
1121 {
1122 struct scatterlist *sg_start;
1123 struct iscsi_conn *conn = isert_conn->conn;
1124 struct iscsi_cmd *cmd = NULL;
1125 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1126 u32 unsol_data_len = ntoh24(hdr->dlength);
1127 int rc, sg_nents, sg_off, page_off;
1128
1129 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1130 if (rc < 0)
1131 return rc;
1132 else if (!cmd)
1133 return 0;
1134 /*
1135 * FIXME: Unexpected unsolicited_data out
1136 */
1137 if (!cmd->unsolicited_data) {
1138 pr_err("Received unexpected solicited data payload\n");
1139 dump_stack();
1140 return -1;
1141 }
1142
1143 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1144 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1145
1146 sg_off = cmd->write_data_done / PAGE_SIZE;
1147 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149 page_off = cmd->write_data_done % PAGE_SIZE;
1150 /*
1151 * FIXME: Non page-aligned unsolicited_data out
1152 */
1153 if (page_off) {
1154 pr_err("Received unexpected non-page aligned data payload\n");
1155 dump_stack();
1156 return -1;
1157 }
1158 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1159 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1160
1161 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1162 unsol_data_len);
1163
1164 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1165 if (rc < 0)
1166 return rc;
1167
1168 return 0;
1169 }
1170
1171 static int
1172 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1173 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1174 unsigned char *buf)
1175 {
1176 struct iscsi_conn *conn = isert_conn->conn;
1177 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1178 int rc;
1179
1180 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1181 if (rc < 0)
1182 return rc;
1183 /*
1184 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1185 */
1186
1187 return iscsit_process_nop_out(conn, cmd, hdr);
1188 }
1189
1190 static int
1191 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1192 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1193 struct iscsi_text *hdr)
1194 {
1195 struct iscsi_conn *conn = isert_conn->conn;
1196 u32 payload_length = ntoh24(hdr->dlength);
1197 int rc;
1198 unsigned char *text_in;
1199
1200 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1201 if (rc < 0)
1202 return rc;
1203
1204 text_in = kzalloc(payload_length, GFP_KERNEL);
1205 if (!text_in) {
1206 pr_err("Unable to allocate text_in of payload_length: %u\n",
1207 payload_length);
1208 return -ENOMEM;
1209 }
1210 cmd->text_in_ptr = text_in;
1211
1212 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1213
1214 return iscsit_process_text_cmd(conn, cmd, hdr);
1215 }
1216
1217 static int
1218 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1219 uint32_t read_stag, uint64_t read_va,
1220 uint32_t write_stag, uint64_t write_va)
1221 {
1222 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1223 struct iscsi_conn *conn = isert_conn->conn;
1224 struct iscsi_session *sess = conn->sess;
1225 struct iscsi_cmd *cmd;
1226 struct isert_cmd *isert_cmd;
1227 int ret = -EINVAL;
1228 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1229
1230 if (sess->sess_ops->SessionType &&
1231 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1232 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1233 " ignoring\n", opcode);
1234 return 0;
1235 }
1236
1237 switch (opcode) {
1238 case ISCSI_OP_SCSI_CMD:
1239 cmd = isert_allocate_cmd(conn);
1240 if (!cmd)
1241 break;
1242
1243 isert_cmd = iscsit_priv_cmd(cmd);
1244 isert_cmd->read_stag = read_stag;
1245 isert_cmd->read_va = read_va;
1246 isert_cmd->write_stag = write_stag;
1247 isert_cmd->write_va = write_va;
1248
1249 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1250 rx_desc, (unsigned char *)hdr);
1251 break;
1252 case ISCSI_OP_NOOP_OUT:
1253 cmd = isert_allocate_cmd(conn);
1254 if (!cmd)
1255 break;
1256
1257 isert_cmd = iscsit_priv_cmd(cmd);
1258 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1259 rx_desc, (unsigned char *)hdr);
1260 break;
1261 case ISCSI_OP_SCSI_DATA_OUT:
1262 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1263 (unsigned char *)hdr);
1264 break;
1265 case ISCSI_OP_SCSI_TMFUNC:
1266 cmd = isert_allocate_cmd(conn);
1267 if (!cmd)
1268 break;
1269
1270 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1271 (unsigned char *)hdr);
1272 break;
1273 case ISCSI_OP_LOGOUT:
1274 cmd = isert_allocate_cmd(conn);
1275 if (!cmd)
1276 break;
1277
1278 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1279 if (ret > 0)
1280 wait_for_completion_timeout(&conn->conn_logout_comp,
1281 SECONDS_FOR_LOGOUT_COMP *
1282 HZ);
1283 break;
1284 case ISCSI_OP_TEXT:
1285 cmd = isert_allocate_cmd(conn);
1286 if (!cmd)
1287 break;
1288
1289 isert_cmd = iscsit_priv_cmd(cmd);
1290 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1291 rx_desc, (struct iscsi_text *)hdr);
1292 break;
1293 default:
1294 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1295 dump_stack();
1296 break;
1297 }
1298
1299 return ret;
1300 }
1301
1302 static void
1303 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1304 {
1305 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1306 uint64_t read_va = 0, write_va = 0;
1307 uint32_t read_stag = 0, write_stag = 0;
1308 int rc;
1309
1310 switch (iser_hdr->flags & 0xF0) {
1311 case ISCSI_CTRL:
1312 if (iser_hdr->flags & ISER_RSV) {
1313 read_stag = be32_to_cpu(iser_hdr->read_stag);
1314 read_va = be64_to_cpu(iser_hdr->read_va);
1315 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1316 read_stag, (unsigned long long)read_va);
1317 }
1318 if (iser_hdr->flags & ISER_WSV) {
1319 write_stag = be32_to_cpu(iser_hdr->write_stag);
1320 write_va = be64_to_cpu(iser_hdr->write_va);
1321 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1322 write_stag, (unsigned long long)write_va);
1323 }
1324
1325 pr_debug("ISER ISCSI_CTRL PDU\n");
1326 break;
1327 case ISER_HELLO:
1328 pr_err("iSER Hello message\n");
1329 break;
1330 default:
1331 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1332 break;
1333 }
1334
1335 rc = isert_rx_opcode(isert_conn, rx_desc,
1336 read_stag, read_va, write_stag, write_va);
1337 }
1338
1339 static void
1340 isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1341 unsigned long xfer_len)
1342 {
1343 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1344 struct iscsi_hdr *hdr;
1345 u64 rx_dma;
1346 int rx_buflen, outstanding;
1347
1348 if ((char *)desc == isert_conn->login_req_buf) {
1349 rx_dma = isert_conn->login_req_dma;
1350 rx_buflen = ISER_RX_LOGIN_SIZE;
1351 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1352 rx_dma, rx_buflen);
1353 } else {
1354 rx_dma = desc->dma_addr;
1355 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1356 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1357 rx_dma, rx_buflen);
1358 }
1359
1360 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1361
1362 hdr = &desc->iscsi_header;
1363 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1364 hdr->opcode, hdr->itt, hdr->flags,
1365 (int)(xfer_len - ISER_HEADERS_LEN));
1366
1367 if ((char *)desc == isert_conn->login_req_buf)
1368 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1369 isert_conn);
1370 else
1371 isert_rx_do_work(desc, isert_conn);
1372
1373 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1374 DMA_FROM_DEVICE);
1375
1376 isert_conn->post_recv_buf_count--;
1377 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1378 isert_conn->post_recv_buf_count);
1379
1380 if ((char *)desc == isert_conn->login_req_buf)
1381 return;
1382
1383 outstanding = isert_conn->post_recv_buf_count;
1384 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1385 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1386 ISERT_MIN_POSTED_RX);
1387 err = isert_post_recv(isert_conn, count);
1388 if (err) {
1389 pr_err("isert_post_recv() count: %d failed, %d\n",
1390 count, err);
1391 }
1392 }
1393 }
1394
1395 static void
1396 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1397 {
1398 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1399 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1400
1401 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
1402 if (wr->sge) {
1403 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1404 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1405 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1406 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1407 wr->sge = NULL;
1408 }
1409
1410 if (wr->send_wr) {
1411 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1412 kfree(wr->send_wr);
1413 wr->send_wr = NULL;
1414 }
1415
1416 if (wr->ib_sge) {
1417 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1418 kfree(wr->ib_sge);
1419 wr->ib_sge = NULL;
1420 }
1421 }
1422
1423 static void
1424 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1425 {
1426 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1427 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1428 LIST_HEAD(unmap_list);
1429
1430 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
1431
1432 if (wr->fr_desc) {
1433 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
1434 isert_cmd, wr->fr_desc);
1435 spin_lock_bh(&isert_conn->conn_lock);
1436 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
1437 spin_unlock_bh(&isert_conn->conn_lock);
1438 wr->fr_desc = NULL;
1439 }
1440
1441 if (wr->sge) {
1442 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
1443 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1444 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1445 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1446 wr->sge = NULL;
1447 }
1448
1449 wr->ib_sge = NULL;
1450 wr->send_wr = NULL;
1451 }
1452
1453 static void
1454 isert_put_cmd(struct isert_cmd *isert_cmd)
1455 {
1456 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1457 struct isert_conn *isert_conn = isert_cmd->conn;
1458 struct iscsi_conn *conn = isert_conn->conn;
1459 struct isert_device *device = isert_conn->conn_device;
1460
1461 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1462
1463 switch (cmd->iscsi_opcode) {
1464 case ISCSI_OP_SCSI_CMD:
1465 spin_lock_bh(&conn->cmd_lock);
1466 if (!list_empty(&cmd->i_conn_node))
1467 list_del(&cmd->i_conn_node);
1468 spin_unlock_bh(&conn->cmd_lock);
1469
1470 if (cmd->data_direction == DMA_TO_DEVICE)
1471 iscsit_stop_dataout_timer(cmd);
1472
1473 device->unreg_rdma_mem(isert_cmd, isert_conn);
1474 transport_generic_free_cmd(&cmd->se_cmd, 0);
1475 break;
1476 case ISCSI_OP_SCSI_TMFUNC:
1477 spin_lock_bh(&conn->cmd_lock);
1478 if (!list_empty(&cmd->i_conn_node))
1479 list_del(&cmd->i_conn_node);
1480 spin_unlock_bh(&conn->cmd_lock);
1481
1482 transport_generic_free_cmd(&cmd->se_cmd, 0);
1483 break;
1484 case ISCSI_OP_REJECT:
1485 case ISCSI_OP_NOOP_OUT:
1486 case ISCSI_OP_TEXT:
1487 spin_lock_bh(&conn->cmd_lock);
1488 if (!list_empty(&cmd->i_conn_node))
1489 list_del(&cmd->i_conn_node);
1490 spin_unlock_bh(&conn->cmd_lock);
1491
1492 /*
1493 * Handle special case for REJECT when iscsi_add_reject*() has
1494 * overwritten the original iscsi_opcode assignment, and the
1495 * associated cmd->se_cmd needs to be released.
1496 */
1497 if (cmd->se_cmd.se_tfo != NULL) {
1498 pr_debug("Calling transport_generic_free_cmd from"
1499 " isert_put_cmd for 0x%02x\n",
1500 cmd->iscsi_opcode);
1501 transport_generic_free_cmd(&cmd->se_cmd, 0);
1502 break;
1503 }
1504 /*
1505 * Fall-through
1506 */
1507 default:
1508 iscsit_release_cmd(cmd);
1509 break;
1510 }
1511 }
1512
1513 static void
1514 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1515 {
1516 if (tx_desc->dma_addr != 0) {
1517 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1518 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1519 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1520 tx_desc->dma_addr = 0;
1521 }
1522 }
1523
1524 static void
1525 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1526 struct ib_device *ib_dev)
1527 {
1528 if (isert_cmd->pdu_buf_dma != 0) {
1529 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1530 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1531 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1532 isert_cmd->pdu_buf_dma = 0;
1533 }
1534
1535 isert_unmap_tx_desc(tx_desc, ib_dev);
1536 isert_put_cmd(isert_cmd);
1537 }
1538
1539 static void
1540 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1541 struct isert_cmd *isert_cmd)
1542 {
1543 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1544 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1545 struct se_cmd *se_cmd = &cmd->se_cmd;
1546 struct isert_conn *isert_conn = isert_cmd->conn;
1547 struct isert_device *device = isert_conn->conn_device;
1548
1549 iscsit_stop_dataout_timer(cmd);
1550 device->unreg_rdma_mem(isert_cmd, isert_conn);
1551 cmd->write_data_done = wr->cur_rdma_length;
1552
1553 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1554 spin_lock_bh(&cmd->istate_lock);
1555 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1556 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1557 spin_unlock_bh(&cmd->istate_lock);
1558
1559 target_execute_cmd(se_cmd);
1560 }
1561
1562 static void
1563 isert_do_control_comp(struct work_struct *work)
1564 {
1565 struct isert_cmd *isert_cmd = container_of(work,
1566 struct isert_cmd, comp_work);
1567 struct isert_conn *isert_conn = isert_cmd->conn;
1568 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1569 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1570
1571 switch (cmd->i_state) {
1572 case ISTATE_SEND_TASKMGTRSP:
1573 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1574
1575 atomic_dec(&isert_conn->post_send_buf_count);
1576 iscsit_tmr_post_handler(cmd, cmd->conn);
1577
1578 cmd->i_state = ISTATE_SENT_STATUS;
1579 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1580 break;
1581 case ISTATE_SEND_REJECT:
1582 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1583 atomic_dec(&isert_conn->post_send_buf_count);
1584
1585 cmd->i_state = ISTATE_SENT_STATUS;
1586 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1587 break;
1588 case ISTATE_SEND_LOGOUTRSP:
1589 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1590 /*
1591 * Call atomic_dec(&isert_conn->post_send_buf_count)
1592 * from isert_free_conn()
1593 */
1594 isert_conn->logout_posted = true;
1595 iscsit_logout_post_handler(cmd, cmd->conn);
1596 break;
1597 case ISTATE_SEND_TEXTRSP:
1598 atomic_dec(&isert_conn->post_send_buf_count);
1599 cmd->i_state = ISTATE_SENT_STATUS;
1600 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1601 break;
1602 default:
1603 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1604 dump_stack();
1605 break;
1606 }
1607 }
1608
1609 static void
1610 isert_response_completion(struct iser_tx_desc *tx_desc,
1611 struct isert_cmd *isert_cmd,
1612 struct isert_conn *isert_conn,
1613 struct ib_device *ib_dev)
1614 {
1615 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1616
1617 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1618 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1619 cmd->i_state == ISTATE_SEND_REJECT ||
1620 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1621 isert_unmap_tx_desc(tx_desc, ib_dev);
1622
1623 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1624 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1625 return;
1626 }
1627 atomic_dec(&isert_conn->post_send_buf_count);
1628
1629 cmd->i_state = ISTATE_SENT_STATUS;
1630 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1631 }
1632
1633 static void
1634 __isert_send_completion(struct iser_tx_desc *tx_desc,
1635 struct isert_conn *isert_conn)
1636 {
1637 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1638 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1639 struct isert_rdma_wr *wr;
1640
1641 if (!isert_cmd) {
1642 atomic_dec(&isert_conn->post_send_buf_count);
1643 isert_unmap_tx_desc(tx_desc, ib_dev);
1644 return;
1645 }
1646 wr = &isert_cmd->rdma_wr;
1647
1648 switch (wr->iser_ib_op) {
1649 case ISER_IB_RECV:
1650 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1651 dump_stack();
1652 break;
1653 case ISER_IB_SEND:
1654 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1655 isert_response_completion(tx_desc, isert_cmd,
1656 isert_conn, ib_dev);
1657 break;
1658 case ISER_IB_RDMA_WRITE:
1659 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1660 dump_stack();
1661 break;
1662 case ISER_IB_RDMA_READ:
1663 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1664
1665 atomic_dec(&isert_conn->post_send_buf_count);
1666 isert_completion_rdma_read(tx_desc, isert_cmd);
1667 break;
1668 default:
1669 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1670 dump_stack();
1671 break;
1672 }
1673 }
1674
1675 static void
1676 isert_send_completion(struct iser_tx_desc *tx_desc,
1677 struct isert_conn *isert_conn)
1678 {
1679 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1680 struct iser_tx_desc *t;
1681 /*
1682 * Drain coalesced completion llist starting from comp_llnode_batch
1683 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1684 */
1685 while (llnode) {
1686 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1687 llnode = llist_next(llnode);
1688 __isert_send_completion(t, isert_conn);
1689 }
1690 __isert_send_completion(tx_desc, isert_conn);
1691 }
1692
1693 static void
1694 isert_cq_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
1695 {
1696 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1697
1698 if (tx_desc) {
1699 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1700
1701 if (!isert_cmd)
1702 isert_unmap_tx_desc(tx_desc, ib_dev);
1703 else
1704 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1705 }
1706
1707 if (isert_conn->post_recv_buf_count == 0 &&
1708 atomic_read(&isert_conn->post_send_buf_count) == 0) {
1709 pr_debug("isert_cq_comp_err >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1710 pr_debug("Calling wake_up from isert_cq_comp_err\n");
1711
1712 mutex_lock(&isert_conn->conn_mutex);
1713 if (isert_conn->state != ISER_CONN_DOWN)
1714 isert_conn->state = ISER_CONN_TERMINATING;
1715 mutex_unlock(&isert_conn->conn_mutex);
1716
1717 wake_up(&isert_conn->conn_wait_comp_err);
1718 }
1719 }
1720
1721 static void
1722 isert_cq_tx_work(struct work_struct *work)
1723 {
1724 struct isert_cq_desc *cq_desc = container_of(work,
1725 struct isert_cq_desc, cq_tx_work);
1726 struct isert_device *device = cq_desc->device;
1727 int cq_index = cq_desc->cq_index;
1728 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1729 struct isert_conn *isert_conn;
1730 struct iser_tx_desc *tx_desc;
1731 struct ib_wc wc;
1732
1733 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1734 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1735 isert_conn = wc.qp->qp_context;
1736
1737 if (wc.status == IB_WC_SUCCESS) {
1738 isert_send_completion(tx_desc, isert_conn);
1739 } else {
1740 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1741 pr_debug("TX wc.status: 0x%08x\n", wc.status);
1742 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
1743 atomic_dec(&isert_conn->post_send_buf_count);
1744 isert_cq_comp_err(tx_desc, isert_conn);
1745 }
1746 }
1747
1748 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1749 }
1750
1751 static void
1752 isert_cq_tx_callback(struct ib_cq *cq, void *context)
1753 {
1754 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1755
1756 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1757 }
1758
1759 static void
1760 isert_cq_rx_work(struct work_struct *work)
1761 {
1762 struct isert_cq_desc *cq_desc = container_of(work,
1763 struct isert_cq_desc, cq_rx_work);
1764 struct isert_device *device = cq_desc->device;
1765 int cq_index = cq_desc->cq_index;
1766 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1767 struct isert_conn *isert_conn;
1768 struct iser_rx_desc *rx_desc;
1769 struct ib_wc wc;
1770 unsigned long xfer_len;
1771
1772 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1773 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1774 isert_conn = wc.qp->qp_context;
1775
1776 if (wc.status == IB_WC_SUCCESS) {
1777 xfer_len = (unsigned long)wc.byte_len;
1778 isert_rx_completion(rx_desc, isert_conn, xfer_len);
1779 } else {
1780 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1781 if (wc.status != IB_WC_WR_FLUSH_ERR) {
1782 pr_debug("RX wc.status: 0x%08x\n", wc.status);
1783 pr_debug("RX wc.vendor_err: 0x%08x\n",
1784 wc.vendor_err);
1785 }
1786 isert_conn->post_recv_buf_count--;
1787 isert_cq_comp_err(NULL, isert_conn);
1788 }
1789 }
1790
1791 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1792 }
1793
1794 static void
1795 isert_cq_rx_callback(struct ib_cq *cq, void *context)
1796 {
1797 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1798
1799 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1800 }
1801
1802 static int
1803 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1804 {
1805 struct ib_send_wr *wr_failed;
1806 int ret;
1807
1808 atomic_inc(&isert_conn->post_send_buf_count);
1809
1810 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1811 &wr_failed);
1812 if (ret) {
1813 pr_err("ib_post_send failed with %d\n", ret);
1814 atomic_dec(&isert_conn->post_send_buf_count);
1815 return ret;
1816 }
1817 return ret;
1818 }
1819
1820 static int
1821 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1822 {
1823 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1824 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1825 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1826 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1827 &isert_cmd->tx_desc.iscsi_header;
1828
1829 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1830 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1831 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1832 /*
1833 * Attach SENSE DATA payload to iSCSI Response PDU
1834 */
1835 if (cmd->se_cmd.sense_buffer &&
1836 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1837 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1838 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1839 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1840 u32 padding, pdu_len;
1841
1842 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1843 cmd->sense_buffer);
1844 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1845
1846 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1847 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1848 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1849
1850 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1851 (void *)cmd->sense_buffer, pdu_len,
1852 DMA_TO_DEVICE);
1853
1854 isert_cmd->pdu_buf_len = pdu_len;
1855 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1856 tx_dsg->length = pdu_len;
1857 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1858 isert_cmd->tx_desc.num_sge = 2;
1859 }
1860
1861 isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
1862
1863 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1864
1865 return isert_post_response(isert_conn, isert_cmd);
1866 }
1867
1868 static int
1869 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1870 bool nopout_response)
1871 {
1872 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1873 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1874 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1875
1876 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1877 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1878 &isert_cmd->tx_desc.iscsi_header,
1879 nopout_response);
1880 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1881 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1882
1883 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1884
1885 return isert_post_response(isert_conn, isert_cmd);
1886 }
1887
1888 static int
1889 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1890 {
1891 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1892 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1893 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1894
1895 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1896 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1897 &isert_cmd->tx_desc.iscsi_header);
1898 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1899 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1900
1901 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1902
1903 return isert_post_response(isert_conn, isert_cmd);
1904 }
1905
1906 static int
1907 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1908 {
1909 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1910 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1911 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1912
1913 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1914 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1915 &isert_cmd->tx_desc.iscsi_header);
1916 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1917 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1918
1919 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1920
1921 return isert_post_response(isert_conn, isert_cmd);
1922 }
1923
1924 static int
1925 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1926 {
1927 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1928 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1929 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1930 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1931 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1932 struct iscsi_reject *hdr =
1933 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1934
1935 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936 iscsit_build_reject(cmd, conn, hdr);
1937 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1938
1939 hton24(hdr->dlength, ISCSI_HDR_LEN);
1940 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1941 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1942 DMA_TO_DEVICE);
1943 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1944 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1945 tx_dsg->length = ISCSI_HDR_LEN;
1946 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1947 isert_cmd->tx_desc.num_sge = 2;
1948
1949 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1950
1951 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1952
1953 return isert_post_response(isert_conn, isert_cmd);
1954 }
1955
1956 static int
1957 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1958 {
1959 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1960 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1961 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1962 struct iscsi_text_rsp *hdr =
1963 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1964 u32 txt_rsp_len;
1965 int rc;
1966
1967 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1968 rc = iscsit_build_text_rsp(cmd, conn, hdr);
1969 if (rc < 0)
1970 return rc;
1971
1972 txt_rsp_len = rc;
1973 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1974
1975 if (txt_rsp_len) {
1976 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1977 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1978 void *txt_rsp_buf = cmd->buf_ptr;
1979
1980 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1981 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1982
1983 isert_cmd->pdu_buf_len = txt_rsp_len;
1984 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1985 tx_dsg->length = txt_rsp_len;
1986 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1987 isert_cmd->tx_desc.num_sge = 2;
1988 }
1989 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
1990
1991 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1992
1993 return isert_post_response(isert_conn, isert_cmd);
1994 }
1995
1996 static int
1997 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1998 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
1999 u32 data_left, u32 offset)
2000 {
2001 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2002 struct scatterlist *sg_start, *tmp_sg;
2003 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2004 u32 sg_off, page_off;
2005 int i = 0, sg_nents;
2006
2007 sg_off = offset / PAGE_SIZE;
2008 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2009 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2010 page_off = offset % PAGE_SIZE;
2011
2012 send_wr->sg_list = ib_sge;
2013 send_wr->num_sge = sg_nents;
2014 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2015 /*
2016 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2017 */
2018 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2019 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2020 (unsigned long long)tmp_sg->dma_address,
2021 tmp_sg->length, page_off);
2022
2023 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2024 ib_sge->length = min_t(u32, data_left,
2025 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2026 ib_sge->lkey = isert_conn->conn_mr->lkey;
2027
2028 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2029 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2030 page_off = 0;
2031 data_left -= ib_sge->length;
2032 ib_sge++;
2033 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2034 }
2035
2036 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2037 send_wr->sg_list, send_wr->num_sge);
2038
2039 return sg_nents;
2040 }
2041
2042 static int
2043 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2044 struct isert_rdma_wr *wr)
2045 {
2046 struct se_cmd *se_cmd = &cmd->se_cmd;
2047 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2048 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2049 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2050 struct ib_send_wr *send_wr;
2051 struct ib_sge *ib_sge;
2052 struct scatterlist *sg_start;
2053 u32 sg_off = 0, sg_nents;
2054 u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
2055 int ret = 0, count, i, ib_sge_cnt;
2056
2057 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2058 data_left = se_cmd->data_length;
2059 } else {
2060 sg_off = cmd->write_data_done / PAGE_SIZE;
2061 data_left = se_cmd->data_length - cmd->write_data_done;
2062 offset = cmd->write_data_done;
2063 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2064 }
2065
2066 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2067 sg_nents = se_cmd->t_data_nents - sg_off;
2068
2069 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2070 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2071 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2072 if (unlikely(!count)) {
2073 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2074 return -EINVAL;
2075 }
2076 wr->sge = sg_start;
2077 wr->num_sge = sg_nents;
2078 wr->cur_rdma_length = data_left;
2079 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2080 isert_cmd, count, sg_start, sg_nents, data_left);
2081
2082 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2083 if (!ib_sge) {
2084 pr_warn("Unable to allocate ib_sge\n");
2085 ret = -ENOMEM;
2086 goto unmap_sg;
2087 }
2088 wr->ib_sge = ib_sge;
2089
2090 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2091 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2092 GFP_KERNEL);
2093 if (!wr->send_wr) {
2094 pr_debug("Unable to allocate wr->send_wr\n");
2095 ret = -ENOMEM;
2096 goto unmap_sg;
2097 }
2098
2099 wr->isert_cmd = isert_cmd;
2100 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2101
2102 for (i = 0; i < wr->send_wr_num; i++) {
2103 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2104 data_len = min(data_left, rdma_write_max);
2105
2106 send_wr->send_flags = 0;
2107 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2108 send_wr->opcode = IB_WR_RDMA_WRITE;
2109 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2110 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2111 if (i + 1 == wr->send_wr_num)
2112 send_wr->next = &isert_cmd->tx_desc.send_wr;
2113 else
2114 send_wr->next = &wr->send_wr[i + 1];
2115 } else {
2116 send_wr->opcode = IB_WR_RDMA_READ;
2117 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2118 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2119 if (i + 1 == wr->send_wr_num)
2120 send_wr->send_flags = IB_SEND_SIGNALED;
2121 else
2122 send_wr->next = &wr->send_wr[i + 1];
2123 }
2124
2125 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2126 send_wr, data_len, offset);
2127 ib_sge += ib_sge_cnt;
2128
2129 offset += data_len;
2130 va_offset += data_len;
2131 data_left -= data_len;
2132 }
2133
2134 return 0;
2135 unmap_sg:
2136 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2137 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2138 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2139 return ret;
2140 }
2141
2142 static int
2143 isert_map_fr_pagelist(struct ib_device *ib_dev,
2144 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2145 {
2146 u64 start_addr, end_addr, page, chunk_start = 0;
2147 struct scatterlist *tmp_sg;
2148 int i = 0, new_chunk, last_ent, n_pages;
2149
2150 n_pages = 0;
2151 new_chunk = 1;
2152 last_ent = sg_nents - 1;
2153 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2154 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2155 if (new_chunk)
2156 chunk_start = start_addr;
2157 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2158
2159 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2160 i, (unsigned long long)tmp_sg->dma_address,
2161 tmp_sg->length);
2162
2163 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2164 new_chunk = 0;
2165 continue;
2166 }
2167 new_chunk = 1;
2168
2169 page = chunk_start & PAGE_MASK;
2170 do {
2171 fr_pl[n_pages++] = page;
2172 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2173 n_pages - 1, page);
2174 page += PAGE_SIZE;
2175 } while (page < end_addr);
2176 }
2177
2178 return n_pages;
2179 }
2180
2181 static int
2182 isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
2183 struct isert_conn *isert_conn, struct scatterlist *sg_start,
2184 struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
2185 unsigned int data_len)
2186 {
2187 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2188 struct ib_send_wr fr_wr, inv_wr;
2189 struct ib_send_wr *bad_wr, *wr = NULL;
2190 int ret, pagelist_len;
2191 u32 page_off;
2192 u8 key;
2193
2194 sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
2195 page_off = offset % PAGE_SIZE;
2196
2197 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2198 fr_desc, sg_nents, offset);
2199
2200 pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2201 &fr_desc->data_frpl->page_list[0]);
2202
2203 if (!fr_desc->valid) {
2204 memset(&inv_wr, 0, sizeof(inv_wr));
2205 inv_wr.opcode = IB_WR_LOCAL_INV;
2206 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2207 wr = &inv_wr;
2208 /* Bump the key */
2209 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2210 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2211 }
2212
2213 /* Prepare FASTREG WR */
2214 memset(&fr_wr, 0, sizeof(fr_wr));
2215 fr_wr.opcode = IB_WR_FAST_REG_MR;
2216 fr_wr.wr.fast_reg.iova_start =
2217 fr_desc->data_frpl->page_list[0] + page_off;
2218 fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2219 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2220 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2221 fr_wr.wr.fast_reg.length = data_len;
2222 fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2223 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2224
2225 if (!wr)
2226 wr = &fr_wr;
2227 else
2228 wr->next = &fr_wr;
2229
2230 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2231 if (ret) {
2232 pr_err("fast registration failed, ret:%d\n", ret);
2233 return ret;
2234 }
2235 fr_desc->valid = false;
2236
2237 ib_sge->lkey = fr_desc->data_mr->lkey;
2238 ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2239 ib_sge->length = data_len;
2240
2241 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2242 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2243
2244 return ret;
2245 }
2246
2247 static int
2248 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2249 struct isert_rdma_wr *wr)
2250 {
2251 struct se_cmd *se_cmd = &cmd->se_cmd;
2252 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2253 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2254 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2255 struct ib_send_wr *send_wr;
2256 struct ib_sge *ib_sge;
2257 struct scatterlist *sg_start;
2258 struct fast_reg_descriptor *fr_desc;
2259 u32 sg_off = 0, sg_nents;
2260 u32 offset = 0, data_len, data_left, rdma_write_max;
2261 int ret = 0, count;
2262 unsigned long flags;
2263
2264 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2265 data_left = se_cmd->data_length;
2266 } else {
2267 offset = cmd->write_data_done;
2268 sg_off = offset / PAGE_SIZE;
2269 data_left = se_cmd->data_length - cmd->write_data_done;
2270 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2271 }
2272
2273 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2274 sg_nents = se_cmd->t_data_nents - sg_off;
2275
2276 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2277 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2278 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2279 if (unlikely(!count)) {
2280 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2281 return -EINVAL;
2282 }
2283 wr->sge = sg_start;
2284 wr->num_sge = sg_nents;
2285 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2286 isert_cmd, count, sg_start, sg_nents, data_left);
2287
2288 memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2289 ib_sge = &wr->s_ib_sge;
2290 wr->ib_sge = ib_sge;
2291
2292 wr->send_wr_num = 1;
2293 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2294 wr->send_wr = &wr->s_send_wr;
2295
2296 wr->isert_cmd = isert_cmd;
2297 rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2298
2299 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2300 send_wr->sg_list = ib_sge;
2301 send_wr->num_sge = 1;
2302 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2303 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2304 send_wr->opcode = IB_WR_RDMA_WRITE;
2305 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2306 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2307 send_wr->send_flags = 0;
2308 send_wr->next = &isert_cmd->tx_desc.send_wr;
2309 } else {
2310 send_wr->opcode = IB_WR_RDMA_READ;
2311 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2312 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2313 send_wr->send_flags = IB_SEND_SIGNALED;
2314 }
2315
2316 data_len = min(data_left, rdma_write_max);
2317 wr->cur_rdma_length = data_len;
2318
2319 /* if there is a single dma entry, dma mr is sufficient */
2320 if (count == 1) {
2321 ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
2322 ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
2323 ib_sge->lkey = isert_conn->conn_mr->lkey;
2324 wr->fr_desc = NULL;
2325 } else {
2326 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2327 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2328 struct fast_reg_descriptor, list);
2329 list_del(&fr_desc->list);
2330 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2331 wr->fr_desc = fr_desc;
2332
2333 ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
2334 ib_sge, sg_nents, offset, data_len);
2335 if (ret) {
2336 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
2337 goto unmap_sg;
2338 }
2339 }
2340
2341 return 0;
2342
2343 unmap_sg:
2344 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2345 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2346 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2347 return ret;
2348 }
2349
2350 static int
2351 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2352 {
2353 struct se_cmd *se_cmd = &cmd->se_cmd;
2354 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2355 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2356 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2357 struct isert_device *device = isert_conn->conn_device;
2358 struct ib_send_wr *wr_failed;
2359 int rc;
2360
2361 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2362 isert_cmd, se_cmd->data_length);
2363 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2364 rc = device->reg_rdma_mem(conn, cmd, wr);
2365 if (rc) {
2366 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2367 return rc;
2368 }
2369
2370 /*
2371 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2372 */
2373 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2374 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2375 &isert_cmd->tx_desc.iscsi_header);
2376 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2377 isert_init_send_wr(isert_conn, isert_cmd,
2378 &isert_cmd->tx_desc.send_wr, true);
2379
2380 atomic_inc(&isert_conn->post_send_buf_count);
2381
2382 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2383 if (rc) {
2384 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2385 atomic_dec(&isert_conn->post_send_buf_count);
2386 }
2387 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2388 isert_cmd);
2389
2390 return 1;
2391 }
2392
2393 static int
2394 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2395 {
2396 struct se_cmd *se_cmd = &cmd->se_cmd;
2397 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2398 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2399 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2400 struct isert_device *device = isert_conn->conn_device;
2401 struct ib_send_wr *wr_failed;
2402 int rc;
2403
2404 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2405 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2406 wr->iser_ib_op = ISER_IB_RDMA_READ;
2407 rc = device->reg_rdma_mem(conn, cmd, wr);
2408 if (rc) {
2409 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2410 return rc;
2411 }
2412
2413 atomic_inc(&isert_conn->post_send_buf_count);
2414
2415 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2416 if (rc) {
2417 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2418 atomic_dec(&isert_conn->post_send_buf_count);
2419 }
2420 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2421 isert_cmd);
2422
2423 return 0;
2424 }
2425
2426 static int
2427 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2428 {
2429 int ret;
2430
2431 switch (state) {
2432 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2433 ret = isert_put_nopin(cmd, conn, false);
2434 break;
2435 default:
2436 pr_err("Unknown immediate state: 0x%02x\n", state);
2437 ret = -EINVAL;
2438 break;
2439 }
2440
2441 return ret;
2442 }
2443
2444 static int
2445 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2446 {
2447 int ret;
2448
2449 switch (state) {
2450 case ISTATE_SEND_LOGOUTRSP:
2451 ret = isert_put_logout_rsp(cmd, conn);
2452 if (!ret) {
2453 pr_debug("Returning iSER Logout -EAGAIN\n");
2454 ret = -EAGAIN;
2455 }
2456 break;
2457 case ISTATE_SEND_NOPIN:
2458 ret = isert_put_nopin(cmd, conn, true);
2459 break;
2460 case ISTATE_SEND_TASKMGTRSP:
2461 ret = isert_put_tm_rsp(cmd, conn);
2462 break;
2463 case ISTATE_SEND_REJECT:
2464 ret = isert_put_reject(cmd, conn);
2465 break;
2466 case ISTATE_SEND_TEXTRSP:
2467 ret = isert_put_text_rsp(cmd, conn);
2468 break;
2469 case ISTATE_SEND_STATUS:
2470 /*
2471 * Special case for sending non GOOD SCSI status from TX thread
2472 * context during pre se_cmd excecution failure.
2473 */
2474 ret = isert_put_response(conn, cmd);
2475 break;
2476 default:
2477 pr_err("Unknown response state: 0x%02x\n", state);
2478 ret = -EINVAL;
2479 break;
2480 }
2481
2482 return ret;
2483 }
2484
2485 static int
2486 isert_setup_np(struct iscsi_np *np,
2487 struct __kernel_sockaddr_storage *ksockaddr)
2488 {
2489 struct isert_np *isert_np;
2490 struct rdma_cm_id *isert_lid;
2491 struct sockaddr *sa;
2492 int ret;
2493
2494 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2495 if (!isert_np) {
2496 pr_err("Unable to allocate struct isert_np\n");
2497 return -ENOMEM;
2498 }
2499 init_waitqueue_head(&isert_np->np_accept_wq);
2500 mutex_init(&isert_np->np_accept_mutex);
2501 INIT_LIST_HEAD(&isert_np->np_accept_list);
2502 init_completion(&isert_np->np_login_comp);
2503
2504 sa = (struct sockaddr *)ksockaddr;
2505 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2506 /*
2507 * Setup the np->np_sockaddr from the passed sockaddr setup
2508 * in iscsi_target_configfs.c code..
2509 */
2510 memcpy(&np->np_sockaddr, ksockaddr,
2511 sizeof(struct __kernel_sockaddr_storage));
2512
2513 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2514 IB_QPT_RC);
2515 if (IS_ERR(isert_lid)) {
2516 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2517 PTR_ERR(isert_lid));
2518 ret = PTR_ERR(isert_lid);
2519 goto out;
2520 }
2521
2522 ret = rdma_bind_addr(isert_lid, sa);
2523 if (ret) {
2524 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2525 goto out_lid;
2526 }
2527
2528 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2529 if (ret) {
2530 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2531 goto out_lid;
2532 }
2533
2534 isert_np->np_cm_id = isert_lid;
2535 np->np_context = isert_np;
2536 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2537
2538 return 0;
2539
2540 out_lid:
2541 rdma_destroy_id(isert_lid);
2542 out:
2543 kfree(isert_np);
2544 return ret;
2545 }
2546
2547 static int
2548 isert_check_accept_queue(struct isert_np *isert_np)
2549 {
2550 int empty;
2551
2552 mutex_lock(&isert_np->np_accept_mutex);
2553 empty = list_empty(&isert_np->np_accept_list);
2554 mutex_unlock(&isert_np->np_accept_mutex);
2555
2556 return empty;
2557 }
2558
2559 static int
2560 isert_rdma_accept(struct isert_conn *isert_conn)
2561 {
2562 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2563 struct rdma_conn_param cp;
2564 int ret;
2565
2566 memset(&cp, 0, sizeof(struct rdma_conn_param));
2567 cp.responder_resources = isert_conn->responder_resources;
2568 cp.initiator_depth = isert_conn->initiator_depth;
2569 cp.retry_count = 7;
2570 cp.rnr_retry_count = 7;
2571
2572 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2573
2574 ret = rdma_accept(cm_id, &cp);
2575 if (ret) {
2576 pr_err("rdma_accept() failed with: %d\n", ret);
2577 return ret;
2578 }
2579
2580 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2581
2582 return 0;
2583 }
2584
2585 static int
2586 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2587 {
2588 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2589 int ret;
2590
2591 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
2592 /*
2593 * For login requests after the first PDU, isert_rx_login_req() will
2594 * kick schedule_delayed_work(&conn->login_work) as the packet is
2595 * received, which turns this callback from iscsi_target_do_login_rx()
2596 * into a NOP.
2597 */
2598 if (!login->first_request)
2599 return 0;
2600
2601 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2602 if (ret)
2603 return ret;
2604
2605 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2606 return 0;
2607 }
2608
2609 static void
2610 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2611 struct isert_conn *isert_conn)
2612 {
2613 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2614 struct rdma_route *cm_route = &cm_id->route;
2615 struct sockaddr_in *sock_in;
2616 struct sockaddr_in6 *sock_in6;
2617
2618 conn->login_family = np->np_sockaddr.ss_family;
2619
2620 if (np->np_sockaddr.ss_family == AF_INET6) {
2621 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2622 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2623 &sock_in6->sin6_addr.in6_u);
2624 conn->login_port = ntohs(sock_in6->sin6_port);
2625
2626 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2627 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2628 &sock_in6->sin6_addr.in6_u);
2629 conn->local_port = ntohs(sock_in6->sin6_port);
2630 } else {
2631 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2632 sprintf(conn->login_ip, "%pI4",
2633 &sock_in->sin_addr.s_addr);
2634 conn->login_port = ntohs(sock_in->sin_port);
2635
2636 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2637 sprintf(conn->local_ip, "%pI4",
2638 &sock_in->sin_addr.s_addr);
2639 conn->local_port = ntohs(sock_in->sin_port);
2640 }
2641 }
2642
2643 static int
2644 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2645 {
2646 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2647 struct isert_conn *isert_conn;
2648 int max_accept = 0, ret;
2649
2650 accept_wait:
2651 ret = wait_event_interruptible(isert_np->np_accept_wq,
2652 !isert_check_accept_queue(isert_np) ||
2653 np->np_thread_state == ISCSI_NP_THREAD_RESET);
2654 if (max_accept > 5)
2655 return -ENODEV;
2656
2657 spin_lock_bh(&np->np_thread_lock);
2658 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2659 spin_unlock_bh(&np->np_thread_lock);
2660 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2661 return -ENODEV;
2662 }
2663 spin_unlock_bh(&np->np_thread_lock);
2664
2665 mutex_lock(&isert_np->np_accept_mutex);
2666 if (list_empty(&isert_np->np_accept_list)) {
2667 mutex_unlock(&isert_np->np_accept_mutex);
2668 max_accept++;
2669 goto accept_wait;
2670 }
2671 isert_conn = list_first_entry(&isert_np->np_accept_list,
2672 struct isert_conn, conn_accept_node);
2673 list_del_init(&isert_conn->conn_accept_node);
2674 mutex_unlock(&isert_np->np_accept_mutex);
2675
2676 conn->context = isert_conn;
2677 isert_conn->conn = conn;
2678 max_accept = 0;
2679
2680 ret = isert_rdma_post_recvl(isert_conn);
2681 if (ret)
2682 return ret;
2683
2684 ret = isert_rdma_accept(isert_conn);
2685 if (ret)
2686 return ret;
2687
2688 isert_set_conn_info(np, conn, isert_conn);
2689
2690 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2691 return 0;
2692 }
2693
2694 static void
2695 isert_free_np(struct iscsi_np *np)
2696 {
2697 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2698
2699 rdma_destroy_id(isert_np->np_cm_id);
2700
2701 np->np_context = NULL;
2702 kfree(isert_np);
2703 }
2704
2705 static int isert_check_state(struct isert_conn *isert_conn, int state)
2706 {
2707 int ret;
2708
2709 mutex_lock(&isert_conn->conn_mutex);
2710 ret = (isert_conn->state == state);
2711 mutex_unlock(&isert_conn->conn_mutex);
2712
2713 return ret;
2714 }
2715
2716 static void isert_free_conn(struct iscsi_conn *conn)
2717 {
2718 struct isert_conn *isert_conn = conn->context;
2719
2720 pr_debug("isert_free_conn: Starting \n");
2721 /*
2722 * Decrement post_send_buf_count for special case when called
2723 * from isert_do_control_comp() -> iscsit_logout_post_handler()
2724 */
2725 mutex_lock(&isert_conn->conn_mutex);
2726 if (isert_conn->logout_posted)
2727 atomic_dec(&isert_conn->post_send_buf_count);
2728
2729 if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
2730 pr_debug("Calling rdma_disconnect from isert_free_conn\n");
2731 rdma_disconnect(isert_conn->conn_cm_id);
2732 }
2733 /*
2734 * Only wait for conn_wait_comp_err if the isert_conn made it
2735 * into full feature phase..
2736 */
2737 if (isert_conn->state == ISER_CONN_UP) {
2738 pr_debug("isert_free_conn: Before wait_event comp_err %d\n",
2739 isert_conn->state);
2740 mutex_unlock(&isert_conn->conn_mutex);
2741
2742 wait_event(isert_conn->conn_wait_comp_err,
2743 (isert_check_state(isert_conn, ISER_CONN_TERMINATING)));
2744
2745 wait_event(isert_conn->conn_wait,
2746 (isert_check_state(isert_conn, ISER_CONN_DOWN)));
2747
2748 isert_put_conn(isert_conn);
2749 return;
2750 }
2751 if (isert_conn->state == ISER_CONN_INIT) {
2752 mutex_unlock(&isert_conn->conn_mutex);
2753 isert_put_conn(isert_conn);
2754 return;
2755 }
2756 pr_debug("isert_free_conn: wait_event conn_wait %d\n",
2757 isert_conn->state);
2758 mutex_unlock(&isert_conn->conn_mutex);
2759
2760 wait_event(isert_conn->conn_wait,
2761 (isert_check_state(isert_conn, ISER_CONN_DOWN)));
2762
2763 isert_put_conn(isert_conn);
2764 }
2765
2766 static struct iscsit_transport iser_target_transport = {
2767 .name = "IB/iSER",
2768 .transport_type = ISCSI_INFINIBAND,
2769 .priv_size = sizeof(struct isert_cmd),
2770 .owner = THIS_MODULE,
2771 .iscsit_setup_np = isert_setup_np,
2772 .iscsit_accept_np = isert_accept_np,
2773 .iscsit_free_np = isert_free_np,
2774 .iscsit_free_conn = isert_free_conn,
2775 .iscsit_get_login_rx = isert_get_login_rx,
2776 .iscsit_put_login_tx = isert_put_login_tx,
2777 .iscsit_immediate_queue = isert_immediate_queue,
2778 .iscsit_response_queue = isert_response_queue,
2779 .iscsit_get_dataout = isert_get_dataout,
2780 .iscsit_queue_data_in = isert_put_datain,
2781 .iscsit_queue_status = isert_put_response,
2782 };
2783
2784 static int __init isert_init(void)
2785 {
2786 int ret;
2787
2788 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2789 if (!isert_rx_wq) {
2790 pr_err("Unable to allocate isert_rx_wq\n");
2791 return -ENOMEM;
2792 }
2793
2794 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2795 if (!isert_comp_wq) {
2796 pr_err("Unable to allocate isert_comp_wq\n");
2797 ret = -ENOMEM;
2798 goto destroy_rx_wq;
2799 }
2800
2801 iscsit_register_transport(&iser_target_transport);
2802 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2803 return 0;
2804
2805 destroy_rx_wq:
2806 destroy_workqueue(isert_rx_wq);
2807 return ret;
2808 }
2809
2810 static void __exit isert_exit(void)
2811 {
2812 destroy_workqueue(isert_comp_wq);
2813 destroy_workqueue(isert_rx_wq);
2814 iscsit_unregister_transport(&iser_target_transport);
2815 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2816 }
2817
2818 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2819 MODULE_VERSION("0.1");
2820 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2821 MODULE_LICENSE("GPL");
2822
2823 module_init(isert_init);
2824 module_exit(isert_exit);
Linux kernel - Deliverables
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