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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / infiniband / ulp / isert / ib_isert.c
blobfff40b09794770be9eb497d8e3927211eb4bea44
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 <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 #include <linux/semaphore.h>
31
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 \
37 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
38 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
39 ISERT_MAX_CONN)
40
41 static int isert_debug_level;
42 module_param_named(debug_level, isert_debug_level, int, 0644);
43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
44
45 static DEFINE_MUTEX(device_list_mutex);
46 static LIST_HEAD(device_list);
47 static struct workqueue_struct *isert_comp_wq;
48 static struct workqueue_struct *isert_release_wq;
49
50 static int
51 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
52 static int
53 isert_login_post_recv(struct isert_conn *isert_conn);
54 static int
55 isert_rdma_accept(struct isert_conn *isert_conn);
56 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
57
58 static void isert_release_work(struct work_struct *work);
59 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
60 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
61 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
62 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
63
64 static inline bool
65 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
66 {
67 return (conn->pi_support &&
68 cmd->prot_op != TARGET_PROT_NORMAL);
69 }
70
71
72 static void
73 isert_qp_event_callback(struct ib_event *e, void *context)
74 {
75 struct isert_conn *isert_conn = context;
76
77 isert_err("%s (%d): conn %p\n",
78 ib_event_msg(e->event), e->event, isert_conn);
79
80 switch (e->event) {
81 case IB_EVENT_COMM_EST:
82 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
83 break;
84 case IB_EVENT_QP_LAST_WQE_REACHED:
85 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
86 break;
87 default:
88 break;
89 }
90 }
91
92 static struct isert_comp *
93 isert_comp_get(struct isert_conn *isert_conn)
94 {
95 struct isert_device *device = isert_conn->device;
96 struct isert_comp *comp;
97 int i, min = 0;
98
99 mutex_lock(&device_list_mutex);
100 for (i = 0; i < device->comps_used; i++)
101 if (device->comps[i].active_qps <
102 device->comps[min].active_qps)
103 min = i;
104 comp = &device->comps[min];
105 comp->active_qps++;
106 mutex_unlock(&device_list_mutex);
107
108 isert_info("conn %p, using comp %p min_index: %d\n",
109 isert_conn, comp, min);
110
111 return comp;
112 }
113
114 static void
115 isert_comp_put(struct isert_comp *comp)
116 {
117 mutex_lock(&device_list_mutex);
118 comp->active_qps--;
119 mutex_unlock(&device_list_mutex);
120 }
121
122 static struct ib_qp *
123 isert_create_qp(struct isert_conn *isert_conn,
124 struct isert_comp *comp,
125 struct rdma_cm_id *cma_id)
126 {
127 struct isert_device *device = isert_conn->device;
128 struct ib_qp_init_attr attr;
129 int ret;
130
131 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
132 attr.event_handler = isert_qp_event_callback;
133 attr.qp_context = isert_conn;
134 attr.send_cq = comp->cq;
135 attr.recv_cq = comp->cq;
136 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
137 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
138 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
139 attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
140 attr.cap.max_recv_sge = 1;
141 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
142 attr.qp_type = IB_QPT_RC;
143 if (device->pi_capable)
144 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
145
146 ret = rdma_create_qp(cma_id, device->pd, &attr);
147 if (ret) {
148 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
149 return ERR_PTR(ret);
150 }
151
152 return cma_id->qp;
153 }
154
155 static int
156 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
157 {
158 struct isert_comp *comp;
159 int ret;
160
161 comp = isert_comp_get(isert_conn);
162 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
163 if (IS_ERR(isert_conn->qp)) {
164 ret = PTR_ERR(isert_conn->qp);
165 goto err;
166 }
167
168 return 0;
169 err:
170 isert_comp_put(comp);
171 return ret;
172 }
173
174 static int
175 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
176 {
177 struct isert_device *device = isert_conn->device;
178 struct ib_device *ib_dev = device->ib_device;
179 struct iser_rx_desc *rx_desc;
180 struct ib_sge *rx_sg;
181 u64 dma_addr;
182 int i, j;
183
184 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
185 sizeof(struct iser_rx_desc), GFP_KERNEL);
186 if (!isert_conn->rx_descs)
187 return -ENOMEM;
188
189 rx_desc = isert_conn->rx_descs;
190
191 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
192 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
193 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
194 if (ib_dma_mapping_error(ib_dev, dma_addr))
195 goto dma_map_fail;
196
197 rx_desc->dma_addr = dma_addr;
198
199 rx_sg = &rx_desc->rx_sg;
200 rx_sg->addr = rx_desc->dma_addr;
201 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
202 rx_sg->lkey = device->pd->local_dma_lkey;
203 rx_desc->rx_cqe.done = isert_recv_done;
204 }
205
206 return 0;
207
208 dma_map_fail:
209 rx_desc = isert_conn->rx_descs;
210 for (j = 0; j < i; j++, rx_desc++) {
211 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
212 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
213 }
214 kfree(isert_conn->rx_descs);
215 isert_conn->rx_descs = NULL;
216 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
217 return -ENOMEM;
218 }
219
220 static void
221 isert_free_rx_descriptors(struct isert_conn *isert_conn)
222 {
223 struct ib_device *ib_dev = isert_conn->device->ib_device;
224 struct iser_rx_desc *rx_desc;
225 int i;
226
227 if (!isert_conn->rx_descs)
228 return;
229
230 rx_desc = isert_conn->rx_descs;
231 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
232 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
233 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
234 }
235
236 kfree(isert_conn->rx_descs);
237 isert_conn->rx_descs = NULL;
238 }
239
240 static void
241 isert_free_comps(struct isert_device *device)
242 {
243 int i;
244
245 for (i = 0; i < device->comps_used; i++) {
246 struct isert_comp *comp = &device->comps[i];
247
248 if (comp->cq)
249 ib_free_cq(comp->cq);
250 }
251 kfree(device->comps);
252 }
253
254 static int
255 isert_alloc_comps(struct isert_device *device)
256 {
257 int i, max_cqe, ret = 0;
258
259 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
260 device->ib_device->num_comp_vectors));
261
262 isert_info("Using %d CQs, %s supports %d vectors support "
263 "pi_capable %d\n",
264 device->comps_used, device->ib_device->name,
265 device->ib_device->num_comp_vectors,
266 device->pi_capable);
267
268 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
269 GFP_KERNEL);
270 if (!device->comps)
271 return -ENOMEM;
272
273 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
274
275 for (i = 0; i < device->comps_used; i++) {
276 struct isert_comp *comp = &device->comps[i];
277
278 comp->device = device;
279 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
280 IB_POLL_WORKQUEUE);
281 if (IS_ERR(comp->cq)) {
282 isert_err("Unable to allocate cq\n");
283 ret = PTR_ERR(comp->cq);
284 comp->cq = NULL;
285 goto out_cq;
286 }
287 }
288
289 return 0;
290 out_cq:
291 isert_free_comps(device);
292 return ret;
293 }
294
295 static int
296 isert_create_device_ib_res(struct isert_device *device)
297 {
298 struct ib_device *ib_dev = device->ib_device;
299 int ret;
300
301 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
302 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
303
304 ret = isert_alloc_comps(device);
305 if (ret)
306 goto out;
307
308 device->pd = ib_alloc_pd(ib_dev, 0);
309 if (IS_ERR(device->pd)) {
310 ret = PTR_ERR(device->pd);
311 isert_err("failed to allocate pd, device %p, ret=%d\n",
312 device, ret);
313 goto out_cq;
314 }
315
316 /* Check signature cap */
317 device->pi_capable = ib_dev->attrs.device_cap_flags &
318 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
319
320 return 0;
321
322 out_cq:
323 isert_free_comps(device);
324 out:
325 if (ret > 0)
326 ret = -EINVAL;
327 return ret;
328 }
329
330 static void
331 isert_free_device_ib_res(struct isert_device *device)
332 {
333 isert_info("device %p\n", device);
334
335 ib_dealloc_pd(device->pd);
336 isert_free_comps(device);
337 }
338
339 static void
340 isert_device_put(struct isert_device *device)
341 {
342 mutex_lock(&device_list_mutex);
343 device->refcount--;
344 isert_info("device %p refcount %d\n", device, device->refcount);
345 if (!device->refcount) {
346 isert_free_device_ib_res(device);
347 list_del(&device->dev_node);
348 kfree(device);
349 }
350 mutex_unlock(&device_list_mutex);
351 }
352
353 static struct isert_device *
354 isert_device_get(struct rdma_cm_id *cma_id)
355 {
356 struct isert_device *device;
357 int ret;
358
359 mutex_lock(&device_list_mutex);
360 list_for_each_entry(device, &device_list, dev_node) {
361 if (device->ib_device->node_guid == cma_id->device->node_guid) {
362 device->refcount++;
363 isert_info("Found iser device %p refcount %d\n",
364 device, device->refcount);
365 mutex_unlock(&device_list_mutex);
366 return device;
367 }
368 }
369
370 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
371 if (!device) {
372 mutex_unlock(&device_list_mutex);
373 return ERR_PTR(-ENOMEM);
374 }
375
376 INIT_LIST_HEAD(&device->dev_node);
377
378 device->ib_device = cma_id->device;
379 ret = isert_create_device_ib_res(device);
380 if (ret) {
381 kfree(device);
382 mutex_unlock(&device_list_mutex);
383 return ERR_PTR(ret);
384 }
385
386 device->refcount++;
387 list_add_tail(&device->dev_node, &device_list);
388 isert_info("Created a new iser device %p refcount %d\n",
389 device, device->refcount);
390 mutex_unlock(&device_list_mutex);
391
392 return device;
393 }
394
395 static void
396 isert_init_conn(struct isert_conn *isert_conn)
397 {
398 isert_conn->state = ISER_CONN_INIT;
399 INIT_LIST_HEAD(&isert_conn->node);
400 init_completion(&isert_conn->login_comp);
401 init_completion(&isert_conn->login_req_comp);
402 init_waitqueue_head(&isert_conn->rem_wait);
403 kref_init(&isert_conn->kref);
404 mutex_init(&isert_conn->mutex);
405 INIT_WORK(&isert_conn->release_work, isert_release_work);
406 }
407
408 static void
409 isert_free_login_buf(struct isert_conn *isert_conn)
410 {
411 struct ib_device *ib_dev = isert_conn->device->ib_device;
412
413 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
414 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
415 kfree(isert_conn->login_rsp_buf);
416
417 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
418 ISER_RX_PAYLOAD_SIZE,
419 DMA_FROM_DEVICE);
420 kfree(isert_conn->login_req_buf);
421 }
422
423 static int
424 isert_alloc_login_buf(struct isert_conn *isert_conn,
425 struct ib_device *ib_dev)
426 {
427 int ret;
428
429 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
430 GFP_KERNEL);
431 if (!isert_conn->login_req_buf)
432 return -ENOMEM;
433
434 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
435 isert_conn->login_req_buf,
436 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
437 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
438 if (ret) {
439 isert_err("login_req_dma mapping error: %d\n", ret);
440 isert_conn->login_req_dma = 0;
441 goto out_free_login_req_buf;
442 }
443
444 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
445 if (!isert_conn->login_rsp_buf) {
446 ret = -ENOMEM;
447 goto out_unmap_login_req_buf;
448 }
449
450 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
451 isert_conn->login_rsp_buf,
452 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
453 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
454 if (ret) {
455 isert_err("login_rsp_dma mapping error: %d\n", ret);
456 isert_conn->login_rsp_dma = 0;
457 goto out_free_login_rsp_buf;
458 }
459
460 return 0;
461
462 out_free_login_rsp_buf:
463 kfree(isert_conn->login_rsp_buf);
464 out_unmap_login_req_buf:
465 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
466 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
467 out_free_login_req_buf:
468 kfree(isert_conn->login_req_buf);
469 return ret;
470 }
471
472 static void
473 isert_set_nego_params(struct isert_conn *isert_conn,
474 struct rdma_conn_param *param)
475 {
476 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
477
478 /* Set max inflight RDMA READ requests */
479 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
480 attr->max_qp_init_rd_atom);
481 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
482
483 if (param->private_data) {
484 u8 flags = *(u8 *)param->private_data;
485
486 /*
487 * use remote invalidation if the both initiator
488 * and the HCA support it
489 */
490 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
491 (attr->device_cap_flags &
492 IB_DEVICE_MEM_MGT_EXTENSIONS);
493 if (isert_conn->snd_w_inv)
494 isert_info("Using remote invalidation\n");
495 }
496 }
497
498 static int
499 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
500 {
501 struct isert_np *isert_np = cma_id->context;
502 struct iscsi_np *np = isert_np->np;
503 struct isert_conn *isert_conn;
504 struct isert_device *device;
505 int ret = 0;
506
507 spin_lock_bh(&np->np_thread_lock);
508 if (!np->enabled) {
509 spin_unlock_bh(&np->np_thread_lock);
510 isert_dbg("iscsi_np is not enabled, reject connect request\n");
511 return rdma_reject(cma_id, NULL, 0);
512 }
513 spin_unlock_bh(&np->np_thread_lock);
514
515 isert_dbg("cma_id: %p, portal: %p\n",
516 cma_id, cma_id->context);
517
518 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
519 if (!isert_conn)
520 return -ENOMEM;
521
522 isert_init_conn(isert_conn);
523 isert_conn->cm_id = cma_id;
524
525 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
526 if (ret)
527 goto out;
528
529 device = isert_device_get(cma_id);
530 if (IS_ERR(device)) {
531 ret = PTR_ERR(device);
532 goto out_rsp_dma_map;
533 }
534 isert_conn->device = device;
535
536 isert_set_nego_params(isert_conn, &event->param.conn);
537
538 ret = isert_conn_setup_qp(isert_conn, cma_id);
539 if (ret)
540 goto out_conn_dev;
541
542 ret = isert_login_post_recv(isert_conn);
543 if (ret)
544 goto out_conn_dev;
545
546 ret = isert_rdma_accept(isert_conn);
547 if (ret)
548 goto out_conn_dev;
549
550 mutex_lock(&isert_np->mutex);
551 list_add_tail(&isert_conn->node, &isert_np->accepted);
552 mutex_unlock(&isert_np->mutex);
553
554 return 0;
555
556 out_conn_dev:
557 isert_device_put(device);
558 out_rsp_dma_map:
559 isert_free_login_buf(isert_conn);
560 out:
561 kfree(isert_conn);
562 rdma_reject(cma_id, NULL, 0);
563 return ret;
564 }
565
566 static void
567 isert_connect_release(struct isert_conn *isert_conn)
568 {
569 struct isert_device *device = isert_conn->device;
570
571 isert_dbg("conn %p\n", isert_conn);
572
573 BUG_ON(!device);
574
575 isert_free_rx_descriptors(isert_conn);
576 if (isert_conn->cm_id &&
577 !isert_conn->dev_removed)
578 rdma_destroy_id(isert_conn->cm_id);
579
580 if (isert_conn->qp) {
581 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
582
583 isert_comp_put(comp);
584 ib_destroy_qp(isert_conn->qp);
585 }
586
587 if (isert_conn->login_req_buf)
588 isert_free_login_buf(isert_conn);
589
590 isert_device_put(device);
591
592 if (isert_conn->dev_removed)
593 wake_up_interruptible(&isert_conn->rem_wait);
594 else
595 kfree(isert_conn);
596 }
597
598 static void
599 isert_connected_handler(struct rdma_cm_id *cma_id)
600 {
601 struct isert_conn *isert_conn = cma_id->qp->qp_context;
602 struct isert_np *isert_np = cma_id->context;
603
604 isert_info("conn %p\n", isert_conn);
605
606 mutex_lock(&isert_conn->mutex);
607 isert_conn->state = ISER_CONN_UP;
608 kref_get(&isert_conn->kref);
609 mutex_unlock(&isert_conn->mutex);
610
611 mutex_lock(&isert_np->mutex);
612 list_move_tail(&isert_conn->node, &isert_np->pending);
613 mutex_unlock(&isert_np->mutex);
614
615 isert_info("np %p: Allow accept_np to continue\n", isert_np);
616 up(&isert_np->sem);
617 }
618
619 static void
620 isert_release_kref(struct kref *kref)
621 {
622 struct isert_conn *isert_conn = container_of(kref,
623 struct isert_conn, kref);
624
625 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
626 current->pid);
627
628 isert_connect_release(isert_conn);
629 }
630
631 static void
632 isert_put_conn(struct isert_conn *isert_conn)
633 {
634 kref_put(&isert_conn->kref, isert_release_kref);
635 }
636
637 static void
638 isert_handle_unbound_conn(struct isert_conn *isert_conn)
639 {
640 struct isert_np *isert_np = isert_conn->cm_id->context;
641
642 mutex_lock(&isert_np->mutex);
643 if (!list_empty(&isert_conn->node)) {
644 /*
645 * This means iscsi doesn't know this connection
646 * so schedule a cleanup ourselves
647 */
648 list_del_init(&isert_conn->node);
649 isert_put_conn(isert_conn);
650 queue_work(isert_release_wq, &isert_conn->release_work);
651 }
652 mutex_unlock(&isert_np->mutex);
653 }
654
655 /**
656 * isert_conn_terminate() - Initiate connection termination
657 * @isert_conn: isert connection struct
658 *
659 * Notes:
660 * In case the connection state is BOUND, move state
661 * to TEMINATING and start teardown sequence (rdma_disconnect).
662 * In case the connection state is UP, complete flush as well.
663 *
664 * This routine must be called with mutex held. Thus it is
665 * safe to call multiple times.
666 */
667 static void
668 isert_conn_terminate(struct isert_conn *isert_conn)
669 {
670 int err;
671
672 if (isert_conn->state >= ISER_CONN_TERMINATING)
673 return;
674
675 isert_info("Terminating conn %p state %d\n",
676 isert_conn, isert_conn->state);
677 isert_conn->state = ISER_CONN_TERMINATING;
678 err = rdma_disconnect(isert_conn->cm_id);
679 if (err)
680 isert_warn("Failed rdma_disconnect isert_conn %p\n",
681 isert_conn);
682 }
683
684 static int
685 isert_np_cma_handler(struct isert_np *isert_np,
686 enum rdma_cm_event_type event)
687 {
688 isert_dbg("%s (%d): isert np %p\n",
689 rdma_event_msg(event), event, isert_np);
690
691 switch (event) {
692 case RDMA_CM_EVENT_DEVICE_REMOVAL:
693 isert_np->cm_id = NULL;
694 break;
695 case RDMA_CM_EVENT_ADDR_CHANGE:
696 isert_np->cm_id = isert_setup_id(isert_np);
697 if (IS_ERR(isert_np->cm_id)) {
698 isert_err("isert np %p setup id failed: %ld\n",
699 isert_np, PTR_ERR(isert_np->cm_id));
700 isert_np->cm_id = NULL;
701 }
702 break;
703 default:
704 isert_err("isert np %p Unexpected event %d\n",
705 isert_np, event);
706 }
707
708 return -1;
709 }
710
711 static int
712 isert_disconnected_handler(struct rdma_cm_id *cma_id,
713 enum rdma_cm_event_type event)
714 {
715 struct isert_conn *isert_conn = cma_id->qp->qp_context;
716
717 mutex_lock(&isert_conn->mutex);
718 switch (isert_conn->state) {
719 case ISER_CONN_TERMINATING:
720 break;
721 case ISER_CONN_UP:
722 isert_conn_terminate(isert_conn);
723 ib_drain_qp(isert_conn->qp);
724 isert_handle_unbound_conn(isert_conn);
725 break;
726 case ISER_CONN_BOUND:
727 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
728 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
729 break;
730 default:
731 isert_warn("conn %p terminating in state %d\n",
732 isert_conn, isert_conn->state);
733 }
734 mutex_unlock(&isert_conn->mutex);
735
736 return 0;
737 }
738
739 static int
740 isert_connect_error(struct rdma_cm_id *cma_id)
741 {
742 struct isert_conn *isert_conn = cma_id->qp->qp_context;
743
744 ib_drain_qp(isert_conn->qp);
745 list_del_init(&isert_conn->node);
746 isert_conn->cm_id = NULL;
747 isert_put_conn(isert_conn);
748
749 return -1;
750 }
751
752 static int
753 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
754 {
755 struct isert_np *isert_np = cma_id->context;
756 struct isert_conn *isert_conn;
757 int ret = 0;
758
759 isert_info("%s (%d): status %d id %p np %p\n",
760 rdma_event_msg(event->event), event->event,
761 event->status, cma_id, cma_id->context);
762
763 if (isert_np->cm_id == cma_id)
764 return isert_np_cma_handler(cma_id->context, event->event);
765
766 switch (event->event) {
767 case RDMA_CM_EVENT_CONNECT_REQUEST:
768 ret = isert_connect_request(cma_id, event);
769 if (ret)
770 isert_err("failed handle connect request %d\n", ret);
771 break;
772 case RDMA_CM_EVENT_ESTABLISHED:
773 isert_connected_handler(cma_id);
774 break;
775 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
776 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
777 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
778 ret = isert_disconnected_handler(cma_id, event->event);
779 break;
780 case RDMA_CM_EVENT_DEVICE_REMOVAL:
781 isert_conn = cma_id->qp->qp_context;
782 isert_conn->dev_removed = true;
783 isert_disconnected_handler(cma_id, event->event);
784 wait_event_interruptible(isert_conn->rem_wait,
785 isert_conn->state == ISER_CONN_DOWN);
786 kfree(isert_conn);
787 /*
788 * return non-zero from the callback to destroy
789 * the rdma cm id
790 */
791 return 1;
792 case RDMA_CM_EVENT_REJECTED:
793 isert_info("Connection rejected: %s\n",
794 rdma_reject_msg(cma_id, event->status));
795 /* fall through */
796 case RDMA_CM_EVENT_UNREACHABLE:
797 case RDMA_CM_EVENT_CONNECT_ERROR:
798 ret = isert_connect_error(cma_id);
799 break;
800 default:
801 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
802 break;
803 }
804
805 return ret;
806 }
807
808 static int
809 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
810 {
811 struct ib_recv_wr *rx_wr, *rx_wr_failed;
812 int i, ret;
813 struct iser_rx_desc *rx_desc;
814
815 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
816 rx_desc = &isert_conn->rx_descs[i];
817
818 rx_wr->wr_cqe = &rx_desc->rx_cqe;
819 rx_wr->sg_list = &rx_desc->rx_sg;
820 rx_wr->num_sge = 1;
821 rx_wr->next = rx_wr + 1;
822 rx_desc->in_use = false;
823 }
824 rx_wr--;
825 rx_wr->next = NULL; /* mark end of work requests list */
826
827 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
828 &rx_wr_failed);
829 if (ret)
830 isert_err("ib_post_recv() failed with ret: %d\n", ret);
831
832 return ret;
833 }
834
835 static int
836 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
837 {
838 struct ib_recv_wr *rx_wr_failed, rx_wr;
839 int ret;
840
841 if (!rx_desc->in_use) {
842 /*
843 * if the descriptor is not in-use we already reposted it
844 * for recv, so just silently return
845 */
846 return 0;
847 }
848
849 rx_desc->in_use = false;
850 rx_wr.wr_cqe = &rx_desc->rx_cqe;
851 rx_wr.sg_list = &rx_desc->rx_sg;
852 rx_wr.num_sge = 1;
853 rx_wr.next = NULL;
854
855 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
856 if (ret)
857 isert_err("ib_post_recv() failed with ret: %d\n", ret);
858
859 return ret;
860 }
861
862 static int
863 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
864 {
865 struct ib_device *ib_dev = isert_conn->cm_id->device;
866 struct ib_send_wr send_wr, *send_wr_failed;
867 int ret;
868
869 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
870 ISER_HEADERS_LEN, DMA_TO_DEVICE);
871
872 tx_desc->tx_cqe.done = isert_login_send_done;
873
874 send_wr.next = NULL;
875 send_wr.wr_cqe = &tx_desc->tx_cqe;
876 send_wr.sg_list = tx_desc->tx_sg;
877 send_wr.num_sge = tx_desc->num_sge;
878 send_wr.opcode = IB_WR_SEND;
879 send_wr.send_flags = IB_SEND_SIGNALED;
880
881 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
882 if (ret)
883 isert_err("ib_post_send() failed, ret: %d\n", ret);
884
885 return ret;
886 }
887
888 static void
889 isert_create_send_desc(struct isert_conn *isert_conn,
890 struct isert_cmd *isert_cmd,
891 struct iser_tx_desc *tx_desc)
892 {
893 struct isert_device *device = isert_conn->device;
894 struct ib_device *ib_dev = device->ib_device;
895
896 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
897 ISER_HEADERS_LEN, DMA_TO_DEVICE);
898
899 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
900 tx_desc->iser_header.flags = ISCSI_CTRL;
901
902 tx_desc->num_sge = 1;
903
904 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
905 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
906 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
907 }
908 }
909
910 static int
911 isert_init_tx_hdrs(struct isert_conn *isert_conn,
912 struct iser_tx_desc *tx_desc)
913 {
914 struct isert_device *device = isert_conn->device;
915 struct ib_device *ib_dev = device->ib_device;
916 u64 dma_addr;
917
918 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
919 ISER_HEADERS_LEN, DMA_TO_DEVICE);
920 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
921 isert_err("ib_dma_mapping_error() failed\n");
922 return -ENOMEM;
923 }
924
925 tx_desc->dma_addr = dma_addr;
926 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
927 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
928 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
929
930 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
931 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
932 tx_desc->tx_sg[0].lkey);
933
934 return 0;
935 }
936
937 static void
938 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
939 struct ib_send_wr *send_wr)
940 {
941 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
942
943 tx_desc->tx_cqe.done = isert_send_done;
944 send_wr->wr_cqe = &tx_desc->tx_cqe;
945
946 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
947 send_wr->opcode = IB_WR_SEND_WITH_INV;
948 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
949 } else {
950 send_wr->opcode = IB_WR_SEND;
951 }
952
953 send_wr->sg_list = &tx_desc->tx_sg[0];
954 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
955 send_wr->send_flags = IB_SEND_SIGNALED;
956 }
957
958 static int
959 isert_login_post_recv(struct isert_conn *isert_conn)
960 {
961 struct ib_recv_wr rx_wr, *rx_wr_fail;
962 struct ib_sge sge;
963 int ret;
964
965 memset(&sge, 0, sizeof(struct ib_sge));
966 sge.addr = isert_conn->login_req_dma;
967 sge.length = ISER_RX_PAYLOAD_SIZE;
968 sge.lkey = isert_conn->device->pd->local_dma_lkey;
969
970 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
971 sge.addr, sge.length, sge.lkey);
972
973 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
974
975 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
976 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
977 rx_wr.sg_list = &sge;
978 rx_wr.num_sge = 1;
979
980 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
981 if (ret)
982 isert_err("ib_post_recv() failed: %d\n", ret);
983
984 return ret;
985 }
986
987 static int
988 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
989 u32 length)
990 {
991 struct isert_conn *isert_conn = conn->context;
992 struct isert_device *device = isert_conn->device;
993 struct ib_device *ib_dev = device->ib_device;
994 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
995 int ret;
996
997 isert_create_send_desc(isert_conn, NULL, tx_desc);
998
999 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1000 sizeof(struct iscsi_hdr));
1001
1002 isert_init_tx_hdrs(isert_conn, tx_desc);
1003
1004 if (length > 0) {
1005 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1006
1007 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1008 length, DMA_TO_DEVICE);
1009
1010 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1011
1012 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1013 length, DMA_TO_DEVICE);
1014
1015 tx_dsg->addr = isert_conn->login_rsp_dma;
1016 tx_dsg->length = length;
1017 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1018 tx_desc->num_sge = 2;
1019 }
1020 if (!login->login_failed) {
1021 if (login->login_complete) {
1022 ret = isert_alloc_rx_descriptors(isert_conn);
1023 if (ret)
1024 return ret;
1025
1026 ret = isert_post_recvm(isert_conn,
1027 ISERT_QP_MAX_RECV_DTOS);
1028 if (ret)
1029 return ret;
1030
1031 /* Now we are in FULL_FEATURE phase */
1032 mutex_lock(&isert_conn->mutex);
1033 isert_conn->state = ISER_CONN_FULL_FEATURE;
1034 mutex_unlock(&isert_conn->mutex);
1035 goto post_send;
1036 }
1037
1038 ret = isert_login_post_recv(isert_conn);
1039 if (ret)
1040 return ret;
1041 }
1042 post_send:
1043 ret = isert_login_post_send(isert_conn, tx_desc);
1044 if (ret)
1045 return ret;
1046
1047 return 0;
1048 }
1049
1050 static void
1051 isert_rx_login_req(struct isert_conn *isert_conn)
1052 {
1053 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1054 int rx_buflen = isert_conn->login_req_len;
1055 struct iscsi_conn *conn = isert_conn->conn;
1056 struct iscsi_login *login = conn->conn_login;
1057 int size;
1058
1059 isert_info("conn %p\n", isert_conn);
1060
1061 WARN_ON_ONCE(!login);
1062
1063 if (login->first_request) {
1064 struct iscsi_login_req *login_req =
1065 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1066 /*
1067 * Setup the initial iscsi_login values from the leading
1068 * login request PDU.
1069 */
1070 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1071 login->current_stage =
1072 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1073 >> 2;
1074 login->version_min = login_req->min_version;
1075 login->version_max = login_req->max_version;
1076 memcpy(login->isid, login_req->isid, 6);
1077 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1078 login->init_task_tag = login_req->itt;
1079 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1080 login->cid = be16_to_cpu(login_req->cid);
1081 login->tsih = be16_to_cpu(login_req->tsih);
1082 }
1083
1084 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1085
1086 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1087 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1088 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1089 MAX_KEY_VALUE_PAIRS);
1090 memcpy(login->req_buf, &rx_desc->data[0], size);
1091
1092 if (login->first_request) {
1093 complete(&isert_conn->login_comp);
1094 return;
1095 }
1096 schedule_delayed_work(&conn->login_work, 0);
1097 }
1098
1099 static struct iscsi_cmd
1100 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1101 {
1102 struct isert_conn *isert_conn = conn->context;
1103 struct isert_cmd *isert_cmd;
1104 struct iscsi_cmd *cmd;
1105
1106 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1107 if (!cmd) {
1108 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1109 return NULL;
1110 }
1111 isert_cmd = iscsit_priv_cmd(cmd);
1112 isert_cmd->conn = isert_conn;
1113 isert_cmd->iscsi_cmd = cmd;
1114 isert_cmd->rx_desc = rx_desc;
1115
1116 return cmd;
1117 }
1118
1119 static int
1120 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1121 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1122 struct iser_rx_desc *rx_desc, unsigned char *buf)
1123 {
1124 struct iscsi_conn *conn = isert_conn->conn;
1125 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1126 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1127 bool dump_payload = false;
1128 unsigned int data_len;
1129
1130 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1131 if (rc < 0)
1132 return rc;
1133
1134 imm_data = cmd->immediate_data;
1135 imm_data_len = cmd->first_burst_len;
1136 unsol_data = cmd->unsolicited_data;
1137 data_len = cmd->se_cmd.data_length;
1138
1139 if (imm_data && imm_data_len == data_len)
1140 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1141 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1142 if (rc < 0) {
1143 return 0;
1144 } else if (rc > 0) {
1145 dump_payload = true;
1146 goto sequence_cmd;
1147 }
1148
1149 if (!imm_data)
1150 return 0;
1151
1152 if (imm_data_len != data_len) {
1153 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1154 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1155 &rx_desc->data[0], imm_data_len);
1156 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1157 sg_nents, imm_data_len);
1158 } else {
1159 sg_init_table(&isert_cmd->sg, 1);
1160 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1161 cmd->se_cmd.t_data_nents = 1;
1162 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1163 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1164 imm_data_len);
1165 }
1166
1167 cmd->write_data_done += imm_data_len;
1168
1169 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1170 spin_lock_bh(&cmd->istate_lock);
1171 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1172 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1173 spin_unlock_bh(&cmd->istate_lock);
1174 }
1175
1176 sequence_cmd:
1177 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1178
1179 if (!rc && dump_payload == false && unsol_data)
1180 iscsit_set_unsoliticed_dataout(cmd);
1181 else if (dump_payload && imm_data)
1182 target_put_sess_cmd(&cmd->se_cmd);
1183
1184 return 0;
1185 }
1186
1187 static int
1188 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1189 struct iser_rx_desc *rx_desc, unsigned char *buf)
1190 {
1191 struct scatterlist *sg_start;
1192 struct iscsi_conn *conn = isert_conn->conn;
1193 struct iscsi_cmd *cmd = NULL;
1194 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1195 u32 unsol_data_len = ntoh24(hdr->dlength);
1196 int rc, sg_nents, sg_off, page_off;
1197
1198 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1199 if (rc < 0)
1200 return rc;
1201 else if (!cmd)
1202 return 0;
1203 /*
1204 * FIXME: Unexpected unsolicited_data out
1205 */
1206 if (!cmd->unsolicited_data) {
1207 isert_err("Received unexpected solicited data payload\n");
1208 dump_stack();
1209 return -1;
1210 }
1211
1212 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1213 "write_data_done: %u, data_length: %u\n",
1214 unsol_data_len, cmd->write_data_done,
1215 cmd->se_cmd.data_length);
1216
1217 sg_off = cmd->write_data_done / PAGE_SIZE;
1218 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1219 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1220 page_off = cmd->write_data_done % PAGE_SIZE;
1221 /*
1222 * FIXME: Non page-aligned unsolicited_data out
1223 */
1224 if (page_off) {
1225 isert_err("unexpected non-page aligned data payload\n");
1226 dump_stack();
1227 return -1;
1228 }
1229 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1230 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1231 sg_nents, &rx_desc->data[0], unsol_data_len);
1232
1233 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1234 unsol_data_len);
1235
1236 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1237 if (rc < 0)
1238 return rc;
1239
1240 /*
1241 * multiple data-outs on the same command can arrive -
1242 * so post the buffer before hand
1243 */
1244 rc = isert_post_recv(isert_conn, rx_desc);
1245 if (rc) {
1246 isert_err("ib_post_recv failed with %d\n", rc);
1247 return rc;
1248 }
1249 return 0;
1250 }
1251
1252 static int
1253 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1254 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1255 unsigned char *buf)
1256 {
1257 struct iscsi_conn *conn = isert_conn->conn;
1258 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1259 int rc;
1260
1261 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1262 if (rc < 0)
1263 return rc;
1264 /*
1265 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1266 */
1267
1268 return iscsit_process_nop_out(conn, cmd, hdr);
1269 }
1270
1271 static int
1272 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1273 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1274 struct iscsi_text *hdr)
1275 {
1276 struct iscsi_conn *conn = isert_conn->conn;
1277 u32 payload_length = ntoh24(hdr->dlength);
1278 int rc;
1279 unsigned char *text_in = NULL;
1280
1281 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1282 if (rc < 0)
1283 return rc;
1284
1285 if (payload_length) {
1286 text_in = kzalloc(payload_length, GFP_KERNEL);
1287 if (!text_in)
1288 return -ENOMEM;
1289 }
1290 cmd->text_in_ptr = text_in;
1291
1292 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1293
1294 return iscsit_process_text_cmd(conn, cmd, hdr);
1295 }
1296
1297 static int
1298 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1299 uint32_t read_stag, uint64_t read_va,
1300 uint32_t write_stag, uint64_t write_va)
1301 {
1302 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1303 struct iscsi_conn *conn = isert_conn->conn;
1304 struct iscsi_cmd *cmd;
1305 struct isert_cmd *isert_cmd;
1306 int ret = -EINVAL;
1307 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1308
1309 if (conn->sess->sess_ops->SessionType &&
1310 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1311 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1312 " ignoring\n", opcode);
1313 return 0;
1314 }
1315
1316 switch (opcode) {
1317 case ISCSI_OP_SCSI_CMD:
1318 cmd = isert_allocate_cmd(conn, rx_desc);
1319 if (!cmd)
1320 break;
1321
1322 isert_cmd = iscsit_priv_cmd(cmd);
1323 isert_cmd->read_stag = read_stag;
1324 isert_cmd->read_va = read_va;
1325 isert_cmd->write_stag = write_stag;
1326 isert_cmd->write_va = write_va;
1327 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1328
1329 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1330 rx_desc, (unsigned char *)hdr);
1331 break;
1332 case ISCSI_OP_NOOP_OUT:
1333 cmd = isert_allocate_cmd(conn, rx_desc);
1334 if (!cmd)
1335 break;
1336
1337 isert_cmd = iscsit_priv_cmd(cmd);
1338 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1339 rx_desc, (unsigned char *)hdr);
1340 break;
1341 case ISCSI_OP_SCSI_DATA_OUT:
1342 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1343 (unsigned char *)hdr);
1344 break;
1345 case ISCSI_OP_SCSI_TMFUNC:
1346 cmd = isert_allocate_cmd(conn, rx_desc);
1347 if (!cmd)
1348 break;
1349
1350 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1351 (unsigned char *)hdr);
1352 break;
1353 case ISCSI_OP_LOGOUT:
1354 cmd = isert_allocate_cmd(conn, rx_desc);
1355 if (!cmd)
1356 break;
1357
1358 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1359 break;
1360 case ISCSI_OP_TEXT:
1361 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1362 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1363 else
1364 cmd = isert_allocate_cmd(conn, rx_desc);
1365
1366 if (!cmd)
1367 break;
1368
1369 isert_cmd = iscsit_priv_cmd(cmd);
1370 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1371 rx_desc, (struct iscsi_text *)hdr);
1372 break;
1373 default:
1374 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1375 dump_stack();
1376 break;
1377 }
1378
1379 return ret;
1380 }
1381
1382 static void
1383 isert_print_wc(struct ib_wc *wc, const char *type)
1384 {
1385 if (wc->status != IB_WC_WR_FLUSH_ERR)
1386 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1387 ib_wc_status_msg(wc->status), wc->status,
1388 wc->vendor_err);
1389 else
1390 isert_dbg("%s failure: %s (%d)\n", type,
1391 ib_wc_status_msg(wc->status), wc->status);
1392 }
1393
1394 static void
1395 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1396 {
1397 struct isert_conn *isert_conn = wc->qp->qp_context;
1398 struct ib_device *ib_dev = isert_conn->cm_id->device;
1399 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1400 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1401 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1402 uint64_t read_va = 0, write_va = 0;
1403 uint32_t read_stag = 0, write_stag = 0;
1404
1405 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1406 isert_print_wc(wc, "recv");
1407 if (wc->status != IB_WC_WR_FLUSH_ERR)
1408 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1409 return;
1410 }
1411
1412 rx_desc->in_use = true;
1413
1414 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1415 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1416
1417 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1418 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1419 (int)(wc->byte_len - ISER_HEADERS_LEN));
1420
1421 switch (iser_ctrl->flags & 0xF0) {
1422 case ISCSI_CTRL:
1423 if (iser_ctrl->flags & ISER_RSV) {
1424 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1425 read_va = be64_to_cpu(iser_ctrl->read_va);
1426 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1427 read_stag, (unsigned long long)read_va);
1428 }
1429 if (iser_ctrl->flags & ISER_WSV) {
1430 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1431 write_va = be64_to_cpu(iser_ctrl->write_va);
1432 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1433 write_stag, (unsigned long long)write_va);
1434 }
1435
1436 isert_dbg("ISER ISCSI_CTRL PDU\n");
1437 break;
1438 case ISER_HELLO:
1439 isert_err("iSER Hello message\n");
1440 break;
1441 default:
1442 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1443 break;
1444 }
1445
1446 isert_rx_opcode(isert_conn, rx_desc,
1447 read_stag, read_va, write_stag, write_va);
1448
1449 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1450 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1451 }
1452
1453 static void
1454 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1455 {
1456 struct isert_conn *isert_conn = wc->qp->qp_context;
1457 struct ib_device *ib_dev = isert_conn->device->ib_device;
1458
1459 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1460 isert_print_wc(wc, "login recv");
1461 return;
1462 }
1463
1464 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1465 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1466
1467 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1468
1469 if (isert_conn->conn) {
1470 struct iscsi_login *login = isert_conn->conn->conn_login;
1471
1472 if (login && !login->first_request)
1473 isert_rx_login_req(isert_conn);
1474 }
1475
1476 mutex_lock(&isert_conn->mutex);
1477 complete(&isert_conn->login_req_comp);
1478 mutex_unlock(&isert_conn->mutex);
1479
1480 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1481 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1482 }
1483
1484 static void
1485 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1486 {
1487 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1488 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1489
1490 if (!cmd->rw.nr_ops)
1491 return;
1492
1493 if (isert_prot_cmd(conn, se_cmd)) {
1494 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1495 conn->cm_id->port_num, se_cmd->t_data_sg,
1496 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1497 se_cmd->t_prot_nents, dir);
1498 } else {
1499 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1500 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1501 }
1502
1503 cmd->rw.nr_ops = 0;
1504 }
1505
1506 static void
1507 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1508 {
1509 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1510 struct isert_conn *isert_conn = isert_cmd->conn;
1511 struct iscsi_conn *conn = isert_conn->conn;
1512 struct iscsi_text_rsp *hdr;
1513
1514 isert_dbg("Cmd %p\n", isert_cmd);
1515
1516 switch (cmd->iscsi_opcode) {
1517 case ISCSI_OP_SCSI_CMD:
1518 spin_lock_bh(&conn->cmd_lock);
1519 if (!list_empty(&cmd->i_conn_node))
1520 list_del_init(&cmd->i_conn_node);
1521 spin_unlock_bh(&conn->cmd_lock);
1522
1523 if (cmd->data_direction == DMA_TO_DEVICE) {
1524 iscsit_stop_dataout_timer(cmd);
1525 /*
1526 * Check for special case during comp_err where
1527 * WRITE_PENDING has been handed off from core,
1528 * but requires an extra target_put_sess_cmd()
1529 * before transport_generic_free_cmd() below.
1530 */
1531 if (comp_err &&
1532 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1533 struct se_cmd *se_cmd = &cmd->se_cmd;
1534
1535 target_put_sess_cmd(se_cmd);
1536 }
1537 }
1538
1539 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1540 transport_generic_free_cmd(&cmd->se_cmd, 0);
1541 break;
1542 case ISCSI_OP_SCSI_TMFUNC:
1543 spin_lock_bh(&conn->cmd_lock);
1544 if (!list_empty(&cmd->i_conn_node))
1545 list_del_init(&cmd->i_conn_node);
1546 spin_unlock_bh(&conn->cmd_lock);
1547
1548 transport_generic_free_cmd(&cmd->se_cmd, 0);
1549 break;
1550 case ISCSI_OP_REJECT:
1551 case ISCSI_OP_NOOP_OUT:
1552 case ISCSI_OP_TEXT:
1553 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1554 /* If the continue bit is on, keep the command alive */
1555 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1556 break;
1557
1558 spin_lock_bh(&conn->cmd_lock);
1559 if (!list_empty(&cmd->i_conn_node))
1560 list_del_init(&cmd->i_conn_node);
1561 spin_unlock_bh(&conn->cmd_lock);
1562
1563 /*
1564 * Handle special case for REJECT when iscsi_add_reject*() has
1565 * overwritten the original iscsi_opcode assignment, and the
1566 * associated cmd->se_cmd needs to be released.
1567 */
1568 if (cmd->se_cmd.se_tfo != NULL) {
1569 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1570 cmd->iscsi_opcode);
1571 transport_generic_free_cmd(&cmd->se_cmd, 0);
1572 break;
1573 }
1574 /* fall through */
1575 default:
1576 iscsit_release_cmd(cmd);
1577 break;
1578 }
1579 }
1580
1581 static void
1582 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1583 {
1584 if (tx_desc->dma_addr != 0) {
1585 isert_dbg("unmap single for tx_desc->dma_addr\n");
1586 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1587 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1588 tx_desc->dma_addr = 0;
1589 }
1590 }
1591
1592 static void
1593 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1594 struct ib_device *ib_dev, bool comp_err)
1595 {
1596 if (isert_cmd->pdu_buf_dma != 0) {
1597 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1598 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1599 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1600 isert_cmd->pdu_buf_dma = 0;
1601 }
1602
1603 isert_unmap_tx_desc(tx_desc, ib_dev);
1604 isert_put_cmd(isert_cmd, comp_err);
1605 }
1606
1607 static int
1608 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1609 {
1610 struct ib_mr_status mr_status;
1611 int ret;
1612
1613 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1614 if (ret) {
1615 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1616 goto fail_mr_status;
1617 }
1618
1619 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1620 u64 sec_offset_err;
1621 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1622
1623 switch (mr_status.sig_err.err_type) {
1624 case IB_SIG_BAD_GUARD:
1625 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1626 break;
1627 case IB_SIG_BAD_REFTAG:
1628 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1629 break;
1630 case IB_SIG_BAD_APPTAG:
1631 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1632 break;
1633 }
1634 sec_offset_err = mr_status.sig_err.sig_err_offset;
1635 do_div(sec_offset_err, block_size);
1636 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1637
1638 isert_err("PI error found type %d at sector 0x%llx "
1639 "expected 0x%x vs actual 0x%x\n",
1640 mr_status.sig_err.err_type,
1641 (unsigned long long)se_cmd->bad_sector,
1642 mr_status.sig_err.expected,
1643 mr_status.sig_err.actual);
1644 ret = 1;
1645 }
1646
1647 fail_mr_status:
1648 return ret;
1649 }
1650
1651 static void
1652 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1653 {
1654 struct isert_conn *isert_conn = wc->qp->qp_context;
1655 struct isert_device *device = isert_conn->device;
1656 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1657 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1658 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1659 int ret = 0;
1660
1661 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1662 isert_print_wc(wc, "rdma write");
1663 if (wc->status != IB_WC_WR_FLUSH_ERR)
1664 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1665 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1666 return;
1667 }
1668
1669 isert_dbg("Cmd %p\n", isert_cmd);
1670
1671 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1672 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1673
1674 if (ret) {
1675 /*
1676 * transport_generic_request_failure() expects to have
1677 * plus two references to handle queue-full, so re-add
1678 * one here as target-core will have already dropped
1679 * it after the first isert_put_datain() callback.
1680 */
1681 kref_get(&cmd->cmd_kref);
1682 transport_generic_request_failure(cmd, cmd->pi_err);
1683 } else {
1684 /*
1685 * XXX: isert_put_response() failure is not retried.
1686 */
1687 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1688 if (ret)
1689 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1690 }
1691 }
1692
1693 static void
1694 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1695 {
1696 struct isert_conn *isert_conn = wc->qp->qp_context;
1697 struct isert_device *device = isert_conn->device;
1698 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1699 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1700 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1701 struct se_cmd *se_cmd = &cmd->se_cmd;
1702 int ret = 0;
1703
1704 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1705 isert_print_wc(wc, "rdma read");
1706 if (wc->status != IB_WC_WR_FLUSH_ERR)
1707 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1708 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1709 return;
1710 }
1711
1712 isert_dbg("Cmd %p\n", isert_cmd);
1713
1714 iscsit_stop_dataout_timer(cmd);
1715
1716 if (isert_prot_cmd(isert_conn, se_cmd))
1717 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1718 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1719 cmd->write_data_done = 0;
1720
1721 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1722 spin_lock_bh(&cmd->istate_lock);
1723 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1724 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1725 spin_unlock_bh(&cmd->istate_lock);
1726
1727 /*
1728 * transport_generic_request_failure() will drop the extra
1729 * se_cmd->cmd_kref reference after T10-PI error, and handle
1730 * any non-zero ->queue_status() callback error retries.
1731 */
1732 if (ret)
1733 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1734 else
1735 target_execute_cmd(se_cmd);
1736 }
1737
1738 static void
1739 isert_do_control_comp(struct work_struct *work)
1740 {
1741 struct isert_cmd *isert_cmd = container_of(work,
1742 struct isert_cmd, comp_work);
1743 struct isert_conn *isert_conn = isert_cmd->conn;
1744 struct ib_device *ib_dev = isert_conn->cm_id->device;
1745 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1746
1747 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1748
1749 switch (cmd->i_state) {
1750 case ISTATE_SEND_TASKMGTRSP:
1751 iscsit_tmr_post_handler(cmd, cmd->conn);
1752 /* fall through */
1753 case ISTATE_SEND_REJECT:
1754 case ISTATE_SEND_TEXTRSP:
1755 cmd->i_state = ISTATE_SENT_STATUS;
1756 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1757 ib_dev, false);
1758 break;
1759 case ISTATE_SEND_LOGOUTRSP:
1760 iscsit_logout_post_handler(cmd, cmd->conn);
1761 break;
1762 default:
1763 isert_err("Unknown i_state %d\n", cmd->i_state);
1764 dump_stack();
1765 break;
1766 }
1767 }
1768
1769 static void
1770 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1771 {
1772 struct isert_conn *isert_conn = wc->qp->qp_context;
1773 struct ib_device *ib_dev = isert_conn->cm_id->device;
1774 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1775
1776 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1777 isert_print_wc(wc, "login send");
1778 if (wc->status != IB_WC_WR_FLUSH_ERR)
1779 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1780 }
1781
1782 isert_unmap_tx_desc(tx_desc, ib_dev);
1783 }
1784
1785 static void
1786 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1787 {
1788 struct isert_conn *isert_conn = wc->qp->qp_context;
1789 struct ib_device *ib_dev = isert_conn->cm_id->device;
1790 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1791 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1792
1793 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1794 isert_print_wc(wc, "send");
1795 if (wc->status != IB_WC_WR_FLUSH_ERR)
1796 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1797 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1798 return;
1799 }
1800
1801 isert_dbg("Cmd %p\n", isert_cmd);
1802
1803 switch (isert_cmd->iscsi_cmd->i_state) {
1804 case ISTATE_SEND_TASKMGTRSP:
1805 case ISTATE_SEND_LOGOUTRSP:
1806 case ISTATE_SEND_REJECT:
1807 case ISTATE_SEND_TEXTRSP:
1808 isert_unmap_tx_desc(tx_desc, ib_dev);
1809
1810 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1811 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1812 return;
1813 default:
1814 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1815 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1816 break;
1817 }
1818 }
1819
1820 static int
1821 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1822 {
1823 struct ib_send_wr *wr_failed;
1824 int ret;
1825
1826 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1827 if (ret) {
1828 isert_err("ib_post_recv failed with %d\n", ret);
1829 return ret;
1830 }
1831
1832 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1833 &wr_failed);
1834 if (ret) {
1835 isert_err("ib_post_send failed with %d\n", ret);
1836 return ret;
1837 }
1838 return ret;
1839 }
1840
1841 static int
1842 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1843 {
1844 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1845 struct isert_conn *isert_conn = conn->context;
1846 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1847 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1848 &isert_cmd->tx_desc.iscsi_header;
1849
1850 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1851 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1852 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1853 /*
1854 * Attach SENSE DATA payload to iSCSI Response PDU
1855 */
1856 if (cmd->se_cmd.sense_buffer &&
1857 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1858 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1859 struct isert_device *device = isert_conn->device;
1860 struct ib_device *ib_dev = device->ib_device;
1861 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1862 u32 padding, pdu_len;
1863
1864 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1865 cmd->sense_buffer);
1866 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1867
1868 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1869 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1870 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1871
1872 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1873 (void *)cmd->sense_buffer, pdu_len,
1874 DMA_TO_DEVICE);
1875 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1876 return -ENOMEM;
1877
1878 isert_cmd->pdu_buf_len = pdu_len;
1879 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1880 tx_dsg->length = pdu_len;
1881 tx_dsg->lkey = device->pd->local_dma_lkey;
1882 isert_cmd->tx_desc.num_sge = 2;
1883 }
1884
1885 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1886
1887 isert_dbg("Posting SCSI Response\n");
1888
1889 return isert_post_response(isert_conn, isert_cmd);
1890 }
1891
1892 static void
1893 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1894 {
1895 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1896 struct isert_conn *isert_conn = conn->context;
1897
1898 spin_lock_bh(&conn->cmd_lock);
1899 if (!list_empty(&cmd->i_conn_node))
1900 list_del_init(&cmd->i_conn_node);
1901 spin_unlock_bh(&conn->cmd_lock);
1902
1903 if (cmd->data_direction == DMA_TO_DEVICE)
1904 iscsit_stop_dataout_timer(cmd);
1905 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1906 }
1907
1908 static enum target_prot_op
1909 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1910 {
1911 struct isert_conn *isert_conn = conn->context;
1912 struct isert_device *device = isert_conn->device;
1913
1914 if (conn->tpg->tpg_attrib.t10_pi) {
1915 if (device->pi_capable) {
1916 isert_info("conn %p PI offload enabled\n", isert_conn);
1917 isert_conn->pi_support = true;
1918 return TARGET_PROT_ALL;
1919 }
1920 }
1921
1922 isert_info("conn %p PI offload disabled\n", isert_conn);
1923 isert_conn->pi_support = false;
1924
1925 return TARGET_PROT_NORMAL;
1926 }
1927
1928 static int
1929 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1930 bool nopout_response)
1931 {
1932 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1933 struct isert_conn *isert_conn = conn->context;
1934 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1935
1936 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1937 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1938 &isert_cmd->tx_desc.iscsi_header,
1939 nopout_response);
1940 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1941 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1942
1943 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1944
1945 return isert_post_response(isert_conn, isert_cmd);
1946 }
1947
1948 static int
1949 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1950 {
1951 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1952 struct isert_conn *isert_conn = conn->context;
1953 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1954
1955 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1956 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1957 &isert_cmd->tx_desc.iscsi_header);
1958 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1959 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1960
1961 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1962
1963 return isert_post_response(isert_conn, isert_cmd);
1964 }
1965
1966 static int
1967 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1968 {
1969 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1970 struct isert_conn *isert_conn = conn->context;
1971 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1972
1973 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1974 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1975 &isert_cmd->tx_desc.iscsi_header);
1976 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1977 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1978
1979 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1980
1981 return isert_post_response(isert_conn, isert_cmd);
1982 }
1983
1984 static int
1985 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1986 {
1987 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1988 struct isert_conn *isert_conn = conn->context;
1989 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1990 struct isert_device *device = isert_conn->device;
1991 struct ib_device *ib_dev = device->ib_device;
1992 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1993 struct iscsi_reject *hdr =
1994 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1995
1996 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1997 iscsit_build_reject(cmd, conn, hdr);
1998 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1999
2000 hton24(hdr->dlength, ISCSI_HDR_LEN);
2001 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2002 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2003 DMA_TO_DEVICE);
2004 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2005 return -ENOMEM;
2006 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2007 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2008 tx_dsg->length = ISCSI_HDR_LEN;
2009 tx_dsg->lkey = device->pd->local_dma_lkey;
2010 isert_cmd->tx_desc.num_sge = 2;
2011
2012 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2013
2014 isert_dbg("conn %p Posting Reject\n", isert_conn);
2015
2016 return isert_post_response(isert_conn, isert_cmd);
2017 }
2018
2019 static int
2020 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2021 {
2022 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2023 struct isert_conn *isert_conn = conn->context;
2024 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2025 struct iscsi_text_rsp *hdr =
2026 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2027 u32 txt_rsp_len;
2028 int rc;
2029
2030 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2031 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2032 if (rc < 0)
2033 return rc;
2034
2035 txt_rsp_len = rc;
2036 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2037
2038 if (txt_rsp_len) {
2039 struct isert_device *device = isert_conn->device;
2040 struct ib_device *ib_dev = device->ib_device;
2041 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2042 void *txt_rsp_buf = cmd->buf_ptr;
2043
2044 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2045 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2046 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2047 return -ENOMEM;
2048
2049 isert_cmd->pdu_buf_len = txt_rsp_len;
2050 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2051 tx_dsg->length = txt_rsp_len;
2052 tx_dsg->lkey = device->pd->local_dma_lkey;
2053 isert_cmd->tx_desc.num_sge = 2;
2054 }
2055 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2056
2057 isert_dbg("conn %p Text Response\n", isert_conn);
2058
2059 return isert_post_response(isert_conn, isert_cmd);
2060 }
2061
2062 static inline void
2063 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2064 struct ib_sig_domain *domain)
2065 {
2066 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2067 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2068 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2069 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2070 /*
2071 * At the moment we hard code those, but if in the future
2072 * the target core would like to use it, we will take it
2073 * from se_cmd.
2074 */
2075 domain->sig.dif.apptag_check_mask = 0xffff;
2076 domain->sig.dif.app_escape = true;
2077 domain->sig.dif.ref_escape = true;
2078 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2079 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2080 domain->sig.dif.ref_remap = true;
2081 };
2082
2083 static int
2084 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2085 {
2086 memset(sig_attrs, 0, sizeof(*sig_attrs));
2087
2088 switch (se_cmd->prot_op) {
2089 case TARGET_PROT_DIN_INSERT:
2090 case TARGET_PROT_DOUT_STRIP:
2091 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2092 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2093 break;
2094 case TARGET_PROT_DOUT_INSERT:
2095 case TARGET_PROT_DIN_STRIP:
2096 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2097 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2098 break;
2099 case TARGET_PROT_DIN_PASS:
2100 case TARGET_PROT_DOUT_PASS:
2101 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2102 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2103 break;
2104 default:
2105 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2106 return -EINVAL;
2107 }
2108
2109 sig_attrs->check_mask =
2110 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2111 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2112 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2113 return 0;
2114 }
2115
2116 static int
2117 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2118 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2119 {
2120 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2121 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2122 u8 port_num = conn->cm_id->port_num;
2123 u64 addr;
2124 u32 rkey, offset;
2125 int ret;
2126
2127 if (cmd->ctx_init_done)
2128 goto rdma_ctx_post;
2129
2130 if (dir == DMA_FROM_DEVICE) {
2131 addr = cmd->write_va;
2132 rkey = cmd->write_stag;
2133 offset = cmd->iscsi_cmd->write_data_done;
2134 } else {
2135 addr = cmd->read_va;
2136 rkey = cmd->read_stag;
2137 offset = 0;
2138 }
2139
2140 if (isert_prot_cmd(conn, se_cmd)) {
2141 struct ib_sig_attrs sig_attrs;
2142
2143 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2144 if (ret)
2145 return ret;
2146
2147 WARN_ON_ONCE(offset);
2148 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2149 se_cmd->t_data_sg, se_cmd->t_data_nents,
2150 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2151 &sig_attrs, addr, rkey, dir);
2152 } else {
2153 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2154 se_cmd->t_data_sg, se_cmd->t_data_nents,
2155 offset, addr, rkey, dir);
2156 }
2157
2158 if (ret < 0) {
2159 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2160 return ret;
2161 }
2162
2163 cmd->ctx_init_done = true;
2164
2165 rdma_ctx_post:
2166 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2167 if (ret < 0)
2168 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2169 return ret;
2170 }
2171
2172 static int
2173 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2174 {
2175 struct se_cmd *se_cmd = &cmd->se_cmd;
2176 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2177 struct isert_conn *isert_conn = conn->context;
2178 struct ib_cqe *cqe = NULL;
2179 struct ib_send_wr *chain_wr = NULL;
2180 int rc;
2181
2182 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2183 isert_cmd, se_cmd->data_length);
2184
2185 if (isert_prot_cmd(isert_conn, se_cmd)) {
2186 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2187 cqe = &isert_cmd->tx_desc.tx_cqe;
2188 } else {
2189 /*
2190 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2191 */
2192 isert_create_send_desc(isert_conn, isert_cmd,
2193 &isert_cmd->tx_desc);
2194 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2195 &isert_cmd->tx_desc.iscsi_header);
2196 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2197 isert_init_send_wr(isert_conn, isert_cmd,
2198 &isert_cmd->tx_desc.send_wr);
2199
2200 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2201 if (rc) {
2202 isert_err("ib_post_recv failed with %d\n", rc);
2203 return rc;
2204 }
2205
2206 chain_wr = &isert_cmd->tx_desc.send_wr;
2207 }
2208
2209 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2210 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2211 isert_cmd, rc);
2212 return rc;
2213 }
2214
2215 static int
2216 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2217 {
2218 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2219 int ret;
2220
2221 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2222 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2223
2224 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2225 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2226 &isert_cmd->tx_desc.tx_cqe, NULL);
2227
2228 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2229 isert_cmd, ret);
2230 return ret;
2231 }
2232
2233 static int
2234 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2235 {
2236 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2237 int ret = 0;
2238
2239 switch (state) {
2240 case ISTATE_REMOVE:
2241 spin_lock_bh(&conn->cmd_lock);
2242 list_del_init(&cmd->i_conn_node);
2243 spin_unlock_bh(&conn->cmd_lock);
2244 isert_put_cmd(isert_cmd, true);
2245 break;
2246 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2247 ret = isert_put_nopin(cmd, conn, false);
2248 break;
2249 default:
2250 isert_err("Unknown immediate state: 0x%02x\n", state);
2251 ret = -EINVAL;
2252 break;
2253 }
2254
2255 return ret;
2256 }
2257
2258 static int
2259 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2260 {
2261 struct isert_conn *isert_conn = conn->context;
2262 int ret;
2263
2264 switch (state) {
2265 case ISTATE_SEND_LOGOUTRSP:
2266 ret = isert_put_logout_rsp(cmd, conn);
2267 if (!ret)
2268 isert_conn->logout_posted = true;
2269 break;
2270 case ISTATE_SEND_NOPIN:
2271 ret = isert_put_nopin(cmd, conn, true);
2272 break;
2273 case ISTATE_SEND_TASKMGTRSP:
2274 ret = isert_put_tm_rsp(cmd, conn);
2275 break;
2276 case ISTATE_SEND_REJECT:
2277 ret = isert_put_reject(cmd, conn);
2278 break;
2279 case ISTATE_SEND_TEXTRSP:
2280 ret = isert_put_text_rsp(cmd, conn);
2281 break;
2282 case ISTATE_SEND_STATUS:
2283 /*
2284 * Special case for sending non GOOD SCSI status from TX thread
2285 * context during pre se_cmd excecution failure.
2286 */
2287 ret = isert_put_response(conn, cmd);
2288 break;
2289 default:
2290 isert_err("Unknown response state: 0x%02x\n", state);
2291 ret = -EINVAL;
2292 break;
2293 }
2294
2295 return ret;
2296 }
2297
2298 struct rdma_cm_id *
2299 isert_setup_id(struct isert_np *isert_np)
2300 {
2301 struct iscsi_np *np = isert_np->np;
2302 struct rdma_cm_id *id;
2303 struct sockaddr *sa;
2304 int ret;
2305
2306 sa = (struct sockaddr *)&np->np_sockaddr;
2307 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2308
2309 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2310 RDMA_PS_TCP, IB_QPT_RC);
2311 if (IS_ERR(id)) {
2312 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2313 ret = PTR_ERR(id);
2314 goto out;
2315 }
2316 isert_dbg("id %p context %p\n", id, id->context);
2317
2318 ret = rdma_bind_addr(id, sa);
2319 if (ret) {
2320 isert_err("rdma_bind_addr() failed: %d\n", ret);
2321 goto out_id;
2322 }
2323
2324 ret = rdma_listen(id, 0);
2325 if (ret) {
2326 isert_err("rdma_listen() failed: %d\n", ret);
2327 goto out_id;
2328 }
2329
2330 return id;
2331 out_id:
2332 rdma_destroy_id(id);
2333 out:
2334 return ERR_PTR(ret);
2335 }
2336
2337 static int
2338 isert_setup_np(struct iscsi_np *np,
2339 struct sockaddr_storage *ksockaddr)
2340 {
2341 struct isert_np *isert_np;
2342 struct rdma_cm_id *isert_lid;
2343 int ret;
2344
2345 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2346 if (!isert_np)
2347 return -ENOMEM;
2348
2349 sema_init(&isert_np->sem, 0);
2350 mutex_init(&isert_np->mutex);
2351 INIT_LIST_HEAD(&isert_np->accepted);
2352 INIT_LIST_HEAD(&isert_np->pending);
2353 isert_np->np = np;
2354
2355 /*
2356 * Setup the np->np_sockaddr from the passed sockaddr setup
2357 * in iscsi_target_configfs.c code..
2358 */
2359 memcpy(&np->np_sockaddr, ksockaddr,
2360 sizeof(struct sockaddr_storage));
2361
2362 isert_lid = isert_setup_id(isert_np);
2363 if (IS_ERR(isert_lid)) {
2364 ret = PTR_ERR(isert_lid);
2365 goto out;
2366 }
2367
2368 isert_np->cm_id = isert_lid;
2369 np->np_context = isert_np;
2370
2371 return 0;
2372
2373 out:
2374 kfree(isert_np);
2375
2376 return ret;
2377 }
2378
2379 static int
2380 isert_rdma_accept(struct isert_conn *isert_conn)
2381 {
2382 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2383 struct rdma_conn_param cp;
2384 int ret;
2385 struct iser_cm_hdr rsp_hdr;
2386
2387 memset(&cp, 0, sizeof(struct rdma_conn_param));
2388 cp.initiator_depth = isert_conn->initiator_depth;
2389 cp.retry_count = 7;
2390 cp.rnr_retry_count = 7;
2391
2392 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2393 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2394 if (!isert_conn->snd_w_inv)
2395 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2396 cp.private_data = (void *)&rsp_hdr;
2397 cp.private_data_len = sizeof(rsp_hdr);
2398
2399 ret = rdma_accept(cm_id, &cp);
2400 if (ret) {
2401 isert_err("rdma_accept() failed with: %d\n", ret);
2402 return ret;
2403 }
2404
2405 return 0;
2406 }
2407
2408 static int
2409 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2410 {
2411 struct isert_conn *isert_conn = conn->context;
2412 int ret;
2413
2414 isert_info("before login_req comp conn: %p\n", isert_conn);
2415 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2416 if (ret) {
2417 isert_err("isert_conn %p interrupted before got login req\n",
2418 isert_conn);
2419 return ret;
2420 }
2421 reinit_completion(&isert_conn->login_req_comp);
2422
2423 /*
2424 * For login requests after the first PDU, isert_rx_login_req() will
2425 * kick schedule_delayed_work(&conn->login_work) as the packet is
2426 * received, which turns this callback from iscsi_target_do_login_rx()
2427 * into a NOP.
2428 */
2429 if (!login->first_request)
2430 return 0;
2431
2432 isert_rx_login_req(isert_conn);
2433
2434 isert_info("before login_comp conn: %p\n", conn);
2435 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2436 if (ret)
2437 return ret;
2438
2439 isert_info("processing login->req: %p\n", login->req);
2440
2441 return 0;
2442 }
2443
2444 static void
2445 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2446 struct isert_conn *isert_conn)
2447 {
2448 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2449 struct rdma_route *cm_route = &cm_id->route;
2450
2451 conn->login_family = np->np_sockaddr.ss_family;
2452
2453 conn->login_sockaddr = cm_route->addr.dst_addr;
2454 conn->local_sockaddr = cm_route->addr.src_addr;
2455 }
2456
2457 static int
2458 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2459 {
2460 struct isert_np *isert_np = np->np_context;
2461 struct isert_conn *isert_conn;
2462 int ret;
2463
2464 accept_wait:
2465 ret = down_interruptible(&isert_np->sem);
2466 if (ret)
2467 return -ENODEV;
2468
2469 spin_lock_bh(&np->np_thread_lock);
2470 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2471 spin_unlock_bh(&np->np_thread_lock);
2472 isert_dbg("np_thread_state %d\n",
2473 np->np_thread_state);
2474 /**
2475 * No point in stalling here when np_thread
2476 * is in state RESET/SHUTDOWN/EXIT - bail
2477 **/
2478 return -ENODEV;
2479 }
2480 spin_unlock_bh(&np->np_thread_lock);
2481
2482 mutex_lock(&isert_np->mutex);
2483 if (list_empty(&isert_np->pending)) {
2484 mutex_unlock(&isert_np->mutex);
2485 goto accept_wait;
2486 }
2487 isert_conn = list_first_entry(&isert_np->pending,
2488 struct isert_conn, node);
2489 list_del_init(&isert_conn->node);
2490 mutex_unlock(&isert_np->mutex);
2491
2492 conn->context = isert_conn;
2493 isert_conn->conn = conn;
2494 isert_conn->state = ISER_CONN_BOUND;
2495
2496 isert_set_conn_info(np, conn, isert_conn);
2497
2498 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2499
2500 return 0;
2501 }
2502
2503 static void
2504 isert_free_np(struct iscsi_np *np)
2505 {
2506 struct isert_np *isert_np = np->np_context;
2507 struct isert_conn *isert_conn, *n;
2508
2509 if (isert_np->cm_id)
2510 rdma_destroy_id(isert_np->cm_id);
2511
2512 /*
2513 * FIXME: At this point we don't have a good way to insure
2514 * that at this point we don't have hanging connections that
2515 * completed RDMA establishment but didn't start iscsi login
2516 * process. So work-around this by cleaning up what ever piled
2517 * up in accepted and pending lists.
2518 */
2519 mutex_lock(&isert_np->mutex);
2520 if (!list_empty(&isert_np->pending)) {
2521 isert_info("Still have isert pending connections\n");
2522 list_for_each_entry_safe(isert_conn, n,
2523 &isert_np->pending,
2524 node) {
2525 isert_info("cleaning isert_conn %p state (%d)\n",
2526 isert_conn, isert_conn->state);
2527 isert_connect_release(isert_conn);
2528 }
2529 }
2530
2531 if (!list_empty(&isert_np->accepted)) {
2532 isert_info("Still have isert accepted connections\n");
2533 list_for_each_entry_safe(isert_conn, n,
2534 &isert_np->accepted,
2535 node) {
2536 isert_info("cleaning isert_conn %p state (%d)\n",
2537 isert_conn, isert_conn->state);
2538 isert_connect_release(isert_conn);
2539 }
2540 }
2541 mutex_unlock(&isert_np->mutex);
2542
2543 np->np_context = NULL;
2544 kfree(isert_np);
2545 }
2546
2547 static void isert_release_work(struct work_struct *work)
2548 {
2549 struct isert_conn *isert_conn = container_of(work,
2550 struct isert_conn,
2551 release_work);
2552
2553 isert_info("Starting release conn %p\n", isert_conn);
2554
2555 mutex_lock(&isert_conn->mutex);
2556 isert_conn->state = ISER_CONN_DOWN;
2557 mutex_unlock(&isert_conn->mutex);
2558
2559 isert_info("Destroying conn %p\n", isert_conn);
2560 isert_put_conn(isert_conn);
2561 }
2562
2563 static void
2564 isert_wait4logout(struct isert_conn *isert_conn)
2565 {
2566 struct iscsi_conn *conn = isert_conn->conn;
2567
2568 isert_info("conn %p\n", isert_conn);
2569
2570 if (isert_conn->logout_posted) {
2571 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2572 wait_for_completion_timeout(&conn->conn_logout_comp,
2573 SECONDS_FOR_LOGOUT_COMP * HZ);
2574 }
2575 }
2576
2577 static void
2578 isert_wait4cmds(struct iscsi_conn *conn)
2579 {
2580 isert_info("iscsi_conn %p\n", conn);
2581
2582 if (conn->sess) {
2583 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2584 target_wait_for_sess_cmds(conn->sess->se_sess);
2585 }
2586 }
2587
2588 /**
2589 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2590 * unsolicitate dataout
2591 * @conn: iscsi connection
2592 *
2593 * We might still have commands that are waiting for unsolicited
2594 * dataouts messages. We must put the extra reference on those
2595 * before blocking on the target_wait_for_session_cmds
2596 */
2597 static void
2598 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2599 {
2600 struct iscsi_cmd *cmd, *tmp;
2601 static LIST_HEAD(drop_cmd_list);
2602
2603 spin_lock_bh(&conn->cmd_lock);
2604 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2605 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2606 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2607 (cmd->write_data_done < cmd->se_cmd.data_length))
2608 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2609 }
2610 spin_unlock_bh(&conn->cmd_lock);
2611
2612 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2613 list_del_init(&cmd->i_conn_node);
2614 if (cmd->i_state != ISTATE_REMOVE) {
2615 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2616
2617 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2618 isert_put_cmd(isert_cmd, true);
2619 }
2620 }
2621 }
2622
2623 static void isert_wait_conn(struct iscsi_conn *conn)
2624 {
2625 struct isert_conn *isert_conn = conn->context;
2626
2627 isert_info("Starting conn %p\n", isert_conn);
2628
2629 mutex_lock(&isert_conn->mutex);
2630 isert_conn_terminate(isert_conn);
2631 mutex_unlock(&isert_conn->mutex);
2632
2633 ib_drain_qp(isert_conn->qp);
2634 isert_put_unsol_pending_cmds(conn);
2635 isert_wait4cmds(conn);
2636 isert_wait4logout(isert_conn);
2637
2638 queue_work(isert_release_wq, &isert_conn->release_work);
2639 }
2640
2641 static void isert_free_conn(struct iscsi_conn *conn)
2642 {
2643 struct isert_conn *isert_conn = conn->context;
2644
2645 ib_drain_qp(isert_conn->qp);
2646 isert_put_conn(isert_conn);
2647 }
2648
2649 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2650 {
2651 struct completion comp;
2652
2653 init_completion(&comp);
2654
2655 wait_for_completion_interruptible(&comp);
2656 }
2657
2658 static struct iscsit_transport iser_target_transport = {
2659 .name = "IB/iSER",
2660 .transport_type = ISCSI_INFINIBAND,
2661 .rdma_shutdown = true,
2662 .priv_size = sizeof(struct isert_cmd),
2663 .owner = THIS_MODULE,
2664 .iscsit_setup_np = isert_setup_np,
2665 .iscsit_accept_np = isert_accept_np,
2666 .iscsit_free_np = isert_free_np,
2667 .iscsit_wait_conn = isert_wait_conn,
2668 .iscsit_free_conn = isert_free_conn,
2669 .iscsit_get_login_rx = isert_get_login_rx,
2670 .iscsit_put_login_tx = isert_put_login_tx,
2671 .iscsit_immediate_queue = isert_immediate_queue,
2672 .iscsit_response_queue = isert_response_queue,
2673 .iscsit_get_dataout = isert_get_dataout,
2674 .iscsit_queue_data_in = isert_put_datain,
2675 .iscsit_queue_status = isert_put_response,
2676 .iscsit_aborted_task = isert_aborted_task,
2677 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2678 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2679 };
2680
2681 static int __init isert_init(void)
2682 {
2683 int ret;
2684
2685 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2686 WQ_UNBOUND | WQ_HIGHPRI, 0);
2687 if (!isert_comp_wq) {
2688 isert_err("Unable to allocate isert_comp_wq\n");
2689 return -ENOMEM;
2690 }
2691
2692 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2693 WQ_UNBOUND_MAX_ACTIVE);
2694 if (!isert_release_wq) {
2695 isert_err("Unable to allocate isert_release_wq\n");
2696 ret = -ENOMEM;
2697 goto destroy_comp_wq;
2698 }
2699
2700 iscsit_register_transport(&iser_target_transport);
2701 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2702
2703 return 0;
2704
2705 destroy_comp_wq:
2706 destroy_workqueue(isert_comp_wq);
2707
2708 return ret;
2709 }
2710
2711 static void __exit isert_exit(void)
2712 {
2713 flush_scheduled_work();
2714 destroy_workqueue(isert_release_wq);
2715 destroy_workqueue(isert_comp_wq);
2716 iscsit_unregister_transport(&iser_target_transport);
2717 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2718 }
2719
2720 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2721 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2722 MODULE_LICENSE("GPL");
2723
2724 module_init(isert_init);
2725 module_exit(isert_exit);
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