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[mirror_ubuntu-bionic-kernel.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 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 list_del_init(&isert_conn->node);
745 isert_conn->cm_id = NULL;
746 isert_put_conn(isert_conn);
747
748 return -1;
749 }
750
751 static int
752 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
753 {
754 struct isert_np *isert_np = cma_id->context;
755 struct isert_conn *isert_conn;
756 int ret = 0;
757
758 isert_info("%s (%d): status %d id %p np %p\n",
759 rdma_event_msg(event->event), event->event,
760 event->status, cma_id, cma_id->context);
761
762 if (isert_np->cm_id == cma_id)
763 return isert_np_cma_handler(cma_id->context, event->event);
764
765 switch (event->event) {
766 case RDMA_CM_EVENT_CONNECT_REQUEST:
767 ret = isert_connect_request(cma_id, event);
768 if (ret)
769 isert_err("failed handle connect request %d\n", ret);
770 break;
771 case RDMA_CM_EVENT_ESTABLISHED:
772 isert_connected_handler(cma_id);
773 break;
774 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
775 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
776 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
777 ret = isert_disconnected_handler(cma_id, event->event);
778 break;
779 case RDMA_CM_EVENT_DEVICE_REMOVAL:
780 isert_conn = cma_id->qp->qp_context;
781 isert_conn->dev_removed = true;
782 isert_disconnected_handler(cma_id, event->event);
783 wait_event_interruptible(isert_conn->rem_wait,
784 isert_conn->state == ISER_CONN_DOWN);
785 kfree(isert_conn);
786 /*
787 * return non-zero from the callback to destroy
788 * the rdma cm id
789 */
790 return 1;
791 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
792 isert_info("Connection rejected: %s\n",
793 rdma_reject_msg(cma_id, event->status));
794 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
795 case RDMA_CM_EVENT_CONNECT_ERROR:
796 ret = isert_connect_error(cma_id);
797 break;
798 default:
799 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
800 break;
801 }
802
803 return ret;
804 }
805
806 static int
807 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
808 {
809 struct ib_recv_wr *rx_wr, *rx_wr_failed;
810 int i, ret;
811 struct iser_rx_desc *rx_desc;
812
813 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
814 rx_desc = &isert_conn->rx_descs[i];
815
816 rx_wr->wr_cqe = &rx_desc->rx_cqe;
817 rx_wr->sg_list = &rx_desc->rx_sg;
818 rx_wr->num_sge = 1;
819 rx_wr->next = rx_wr + 1;
820 rx_desc->in_use = false;
821 }
822 rx_wr--;
823 rx_wr->next = NULL; /* mark end of work requests list */
824
825 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
826 &rx_wr_failed);
827 if (ret)
828 isert_err("ib_post_recv() failed with ret: %d\n", ret);
829
830 return ret;
831 }
832
833 static int
834 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
835 {
836 struct ib_recv_wr *rx_wr_failed, rx_wr;
837 int ret;
838
839 if (!rx_desc->in_use) {
840 /*
841 * if the descriptor is not in-use we already reposted it
842 * for recv, so just silently return
843 */
844 return 0;
845 }
846
847 rx_desc->in_use = false;
848 rx_wr.wr_cqe = &rx_desc->rx_cqe;
849 rx_wr.sg_list = &rx_desc->rx_sg;
850 rx_wr.num_sge = 1;
851 rx_wr.next = NULL;
852
853 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
854 if (ret)
855 isert_err("ib_post_recv() failed with ret: %d\n", ret);
856
857 return ret;
858 }
859
860 static int
861 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
862 {
863 struct ib_device *ib_dev = isert_conn->cm_id->device;
864 struct ib_send_wr send_wr, *send_wr_failed;
865 int ret;
866
867 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
868 ISER_HEADERS_LEN, DMA_TO_DEVICE);
869
870 tx_desc->tx_cqe.done = isert_login_send_done;
871
872 send_wr.next = NULL;
873 send_wr.wr_cqe = &tx_desc->tx_cqe;
874 send_wr.sg_list = tx_desc->tx_sg;
875 send_wr.num_sge = tx_desc->num_sge;
876 send_wr.opcode = IB_WR_SEND;
877 send_wr.send_flags = IB_SEND_SIGNALED;
878
879 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
880 if (ret)
881 isert_err("ib_post_send() failed, ret: %d\n", ret);
882
883 return ret;
884 }
885
886 static void
887 isert_create_send_desc(struct isert_conn *isert_conn,
888 struct isert_cmd *isert_cmd,
889 struct iser_tx_desc *tx_desc)
890 {
891 struct isert_device *device = isert_conn->device;
892 struct ib_device *ib_dev = device->ib_device;
893
894 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
895 ISER_HEADERS_LEN, DMA_TO_DEVICE);
896
897 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
898 tx_desc->iser_header.flags = ISCSI_CTRL;
899
900 tx_desc->num_sge = 1;
901
902 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
903 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
904 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
905 }
906 }
907
908 static int
909 isert_init_tx_hdrs(struct isert_conn *isert_conn,
910 struct iser_tx_desc *tx_desc)
911 {
912 struct isert_device *device = isert_conn->device;
913 struct ib_device *ib_dev = device->ib_device;
914 u64 dma_addr;
915
916 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
917 ISER_HEADERS_LEN, DMA_TO_DEVICE);
918 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
919 isert_err("ib_dma_mapping_error() failed\n");
920 return -ENOMEM;
921 }
922
923 tx_desc->dma_addr = dma_addr;
924 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
925 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
926 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
927
928 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
929 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
930 tx_desc->tx_sg[0].lkey);
931
932 return 0;
933 }
934
935 static void
936 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
937 struct ib_send_wr *send_wr)
938 {
939 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
940
941 tx_desc->tx_cqe.done = isert_send_done;
942 send_wr->wr_cqe = &tx_desc->tx_cqe;
943
944 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
945 send_wr->opcode = IB_WR_SEND_WITH_INV;
946 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
947 } else {
948 send_wr->opcode = IB_WR_SEND;
949 }
950
951 send_wr->sg_list = &tx_desc->tx_sg[0];
952 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
953 send_wr->send_flags = IB_SEND_SIGNALED;
954 }
955
956 static int
957 isert_login_post_recv(struct isert_conn *isert_conn)
958 {
959 struct ib_recv_wr rx_wr, *rx_wr_fail;
960 struct ib_sge sge;
961 int ret;
962
963 memset(&sge, 0, sizeof(struct ib_sge));
964 sge.addr = isert_conn->login_req_dma;
965 sge.length = ISER_RX_PAYLOAD_SIZE;
966 sge.lkey = isert_conn->device->pd->local_dma_lkey;
967
968 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
969 sge.addr, sge.length, sge.lkey);
970
971 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
972
973 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
974 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
975 rx_wr.sg_list = &sge;
976 rx_wr.num_sge = 1;
977
978 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
979 if (ret)
980 isert_err("ib_post_recv() failed: %d\n", ret);
981
982 return ret;
983 }
984
985 static int
986 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
987 u32 length)
988 {
989 struct isert_conn *isert_conn = conn->context;
990 struct isert_device *device = isert_conn->device;
991 struct ib_device *ib_dev = device->ib_device;
992 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
993 int ret;
994
995 isert_create_send_desc(isert_conn, NULL, tx_desc);
996
997 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
998 sizeof(struct iscsi_hdr));
999
1000 isert_init_tx_hdrs(isert_conn, tx_desc);
1001
1002 if (length > 0) {
1003 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1004
1005 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1006 length, DMA_TO_DEVICE);
1007
1008 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1009
1010 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1011 length, DMA_TO_DEVICE);
1012
1013 tx_dsg->addr = isert_conn->login_rsp_dma;
1014 tx_dsg->length = length;
1015 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1016 tx_desc->num_sge = 2;
1017 }
1018 if (!login->login_failed) {
1019 if (login->login_complete) {
1020 ret = isert_alloc_rx_descriptors(isert_conn);
1021 if (ret)
1022 return ret;
1023
1024 ret = isert_post_recvm(isert_conn,
1025 ISERT_QP_MAX_RECV_DTOS);
1026 if (ret)
1027 return ret;
1028
1029 /* Now we are in FULL_FEATURE phase */
1030 mutex_lock(&isert_conn->mutex);
1031 isert_conn->state = ISER_CONN_FULL_FEATURE;
1032 mutex_unlock(&isert_conn->mutex);
1033 goto post_send;
1034 }
1035
1036 ret = isert_login_post_recv(isert_conn);
1037 if (ret)
1038 return ret;
1039 }
1040 post_send:
1041 ret = isert_login_post_send(isert_conn, tx_desc);
1042 if (ret)
1043 return ret;
1044
1045 return 0;
1046 }
1047
1048 static void
1049 isert_rx_login_req(struct isert_conn *isert_conn)
1050 {
1051 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1052 int rx_buflen = isert_conn->login_req_len;
1053 struct iscsi_conn *conn = isert_conn->conn;
1054 struct iscsi_login *login = conn->conn_login;
1055 int size;
1056
1057 isert_info("conn %p\n", isert_conn);
1058
1059 WARN_ON_ONCE(!login);
1060
1061 if (login->first_request) {
1062 struct iscsi_login_req *login_req =
1063 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1064 /*
1065 * Setup the initial iscsi_login values from the leading
1066 * login request PDU.
1067 */
1068 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1069 login->current_stage =
1070 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1071 >> 2;
1072 login->version_min = login_req->min_version;
1073 login->version_max = login_req->max_version;
1074 memcpy(login->isid, login_req->isid, 6);
1075 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1076 login->init_task_tag = login_req->itt;
1077 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1078 login->cid = be16_to_cpu(login_req->cid);
1079 login->tsih = be16_to_cpu(login_req->tsih);
1080 }
1081
1082 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1083
1084 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1085 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1086 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1087 MAX_KEY_VALUE_PAIRS);
1088 memcpy(login->req_buf, &rx_desc->data[0], size);
1089
1090 if (login->first_request) {
1091 complete(&isert_conn->login_comp);
1092 return;
1093 }
1094 schedule_delayed_work(&conn->login_work, 0);
1095 }
1096
1097 static struct iscsi_cmd
1098 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1099 {
1100 struct isert_conn *isert_conn = conn->context;
1101 struct isert_cmd *isert_cmd;
1102 struct iscsi_cmd *cmd;
1103
1104 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1105 if (!cmd) {
1106 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1107 return NULL;
1108 }
1109 isert_cmd = iscsit_priv_cmd(cmd);
1110 isert_cmd->conn = isert_conn;
1111 isert_cmd->iscsi_cmd = cmd;
1112 isert_cmd->rx_desc = rx_desc;
1113
1114 return cmd;
1115 }
1116
1117 static int
1118 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1119 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1120 struct iser_rx_desc *rx_desc, unsigned char *buf)
1121 {
1122 struct iscsi_conn *conn = isert_conn->conn;
1123 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1124 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1125 bool dump_payload = false;
1126 unsigned int data_len;
1127
1128 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1129 if (rc < 0)
1130 return rc;
1131
1132 imm_data = cmd->immediate_data;
1133 imm_data_len = cmd->first_burst_len;
1134 unsol_data = cmd->unsolicited_data;
1135 data_len = cmd->se_cmd.data_length;
1136
1137 if (imm_data && imm_data_len == data_len)
1138 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1139 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1140 if (rc < 0) {
1141 return 0;
1142 } else if (rc > 0) {
1143 dump_payload = true;
1144 goto sequence_cmd;
1145 }
1146
1147 if (!imm_data)
1148 return 0;
1149
1150 if (imm_data_len != data_len) {
1151 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1152 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1153 &rx_desc->data[0], imm_data_len);
1154 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1155 sg_nents, imm_data_len);
1156 } else {
1157 sg_init_table(&isert_cmd->sg, 1);
1158 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1159 cmd->se_cmd.t_data_nents = 1;
1160 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1161 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1162 imm_data_len);
1163 }
1164
1165 cmd->write_data_done += imm_data_len;
1166
1167 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1168 spin_lock_bh(&cmd->istate_lock);
1169 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1170 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1171 spin_unlock_bh(&cmd->istate_lock);
1172 }
1173
1174 sequence_cmd:
1175 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1176
1177 if (!rc && dump_payload == false && unsol_data)
1178 iscsit_set_unsoliticed_dataout(cmd);
1179 else if (dump_payload && imm_data)
1180 target_put_sess_cmd(&cmd->se_cmd);
1181
1182 return 0;
1183 }
1184
1185 static int
1186 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1187 struct iser_rx_desc *rx_desc, unsigned char *buf)
1188 {
1189 struct scatterlist *sg_start;
1190 struct iscsi_conn *conn = isert_conn->conn;
1191 struct iscsi_cmd *cmd = NULL;
1192 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1193 u32 unsol_data_len = ntoh24(hdr->dlength);
1194 int rc, sg_nents, sg_off, page_off;
1195
1196 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1197 if (rc < 0)
1198 return rc;
1199 else if (!cmd)
1200 return 0;
1201 /*
1202 * FIXME: Unexpected unsolicited_data out
1203 */
1204 if (!cmd->unsolicited_data) {
1205 isert_err("Received unexpected solicited data payload\n");
1206 dump_stack();
1207 return -1;
1208 }
1209
1210 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1211 "write_data_done: %u, data_length: %u\n",
1212 unsol_data_len, cmd->write_data_done,
1213 cmd->se_cmd.data_length);
1214
1215 sg_off = cmd->write_data_done / PAGE_SIZE;
1216 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1217 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1218 page_off = cmd->write_data_done % PAGE_SIZE;
1219 /*
1220 * FIXME: Non page-aligned unsolicited_data out
1221 */
1222 if (page_off) {
1223 isert_err("unexpected non-page aligned data payload\n");
1224 dump_stack();
1225 return -1;
1226 }
1227 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1228 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1229 sg_nents, &rx_desc->data[0], unsol_data_len);
1230
1231 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1232 unsol_data_len);
1233
1234 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1235 if (rc < 0)
1236 return rc;
1237
1238 /*
1239 * multiple data-outs on the same command can arrive -
1240 * so post the buffer before hand
1241 */
1242 rc = isert_post_recv(isert_conn, rx_desc);
1243 if (rc) {
1244 isert_err("ib_post_recv failed with %d\n", rc);
1245 return rc;
1246 }
1247 return 0;
1248 }
1249
1250 static int
1251 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1252 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1253 unsigned char *buf)
1254 {
1255 struct iscsi_conn *conn = isert_conn->conn;
1256 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1257 int rc;
1258
1259 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1260 if (rc < 0)
1261 return rc;
1262 /*
1263 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1264 */
1265
1266 return iscsit_process_nop_out(conn, cmd, hdr);
1267 }
1268
1269 static int
1270 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1271 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1272 struct iscsi_text *hdr)
1273 {
1274 struct iscsi_conn *conn = isert_conn->conn;
1275 u32 payload_length = ntoh24(hdr->dlength);
1276 int rc;
1277 unsigned char *text_in = NULL;
1278
1279 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1280 if (rc < 0)
1281 return rc;
1282
1283 if (payload_length) {
1284 text_in = kzalloc(payload_length, GFP_KERNEL);
1285 if (!text_in)
1286 return -ENOMEM;
1287 }
1288 cmd->text_in_ptr = text_in;
1289
1290 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1291
1292 return iscsit_process_text_cmd(conn, cmd, hdr);
1293 }
1294
1295 static int
1296 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1297 uint32_t read_stag, uint64_t read_va,
1298 uint32_t write_stag, uint64_t write_va)
1299 {
1300 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1301 struct iscsi_conn *conn = isert_conn->conn;
1302 struct iscsi_cmd *cmd;
1303 struct isert_cmd *isert_cmd;
1304 int ret = -EINVAL;
1305 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1306
1307 if (conn->sess->sess_ops->SessionType &&
1308 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1309 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1310 " ignoring\n", opcode);
1311 return 0;
1312 }
1313
1314 switch (opcode) {
1315 case ISCSI_OP_SCSI_CMD:
1316 cmd = isert_allocate_cmd(conn, rx_desc);
1317 if (!cmd)
1318 break;
1319
1320 isert_cmd = iscsit_priv_cmd(cmd);
1321 isert_cmd->read_stag = read_stag;
1322 isert_cmd->read_va = read_va;
1323 isert_cmd->write_stag = write_stag;
1324 isert_cmd->write_va = write_va;
1325 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1326
1327 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1328 rx_desc, (unsigned char *)hdr);
1329 break;
1330 case ISCSI_OP_NOOP_OUT:
1331 cmd = isert_allocate_cmd(conn, rx_desc);
1332 if (!cmd)
1333 break;
1334
1335 isert_cmd = iscsit_priv_cmd(cmd);
1336 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1337 rx_desc, (unsigned char *)hdr);
1338 break;
1339 case ISCSI_OP_SCSI_DATA_OUT:
1340 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1341 (unsigned char *)hdr);
1342 break;
1343 case ISCSI_OP_SCSI_TMFUNC:
1344 cmd = isert_allocate_cmd(conn, rx_desc);
1345 if (!cmd)
1346 break;
1347
1348 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1349 (unsigned char *)hdr);
1350 break;
1351 case ISCSI_OP_LOGOUT:
1352 cmd = isert_allocate_cmd(conn, rx_desc);
1353 if (!cmd)
1354 break;
1355
1356 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1357 break;
1358 case ISCSI_OP_TEXT:
1359 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1360 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1361 else
1362 cmd = isert_allocate_cmd(conn, rx_desc);
1363
1364 if (!cmd)
1365 break;
1366
1367 isert_cmd = iscsit_priv_cmd(cmd);
1368 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1369 rx_desc, (struct iscsi_text *)hdr);
1370 break;
1371 default:
1372 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1373 dump_stack();
1374 break;
1375 }
1376
1377 return ret;
1378 }
1379
1380 static void
1381 isert_print_wc(struct ib_wc *wc, const char *type)
1382 {
1383 if (wc->status != IB_WC_WR_FLUSH_ERR)
1384 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1385 ib_wc_status_msg(wc->status), wc->status,
1386 wc->vendor_err);
1387 else
1388 isert_dbg("%s failure: %s (%d)\n", type,
1389 ib_wc_status_msg(wc->status), wc->status);
1390 }
1391
1392 static void
1393 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1394 {
1395 struct isert_conn *isert_conn = wc->qp->qp_context;
1396 struct ib_device *ib_dev = isert_conn->cm_id->device;
1397 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1398 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1399 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1400 uint64_t read_va = 0, write_va = 0;
1401 uint32_t read_stag = 0, write_stag = 0;
1402
1403 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1404 isert_print_wc(wc, "recv");
1405 if (wc->status != IB_WC_WR_FLUSH_ERR)
1406 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1407 return;
1408 }
1409
1410 rx_desc->in_use = true;
1411
1412 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1413 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1414
1415 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1416 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1417 (int)(wc->byte_len - ISER_HEADERS_LEN));
1418
1419 switch (iser_ctrl->flags & 0xF0) {
1420 case ISCSI_CTRL:
1421 if (iser_ctrl->flags & ISER_RSV) {
1422 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1423 read_va = be64_to_cpu(iser_ctrl->read_va);
1424 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1425 read_stag, (unsigned long long)read_va);
1426 }
1427 if (iser_ctrl->flags & ISER_WSV) {
1428 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1429 write_va = be64_to_cpu(iser_ctrl->write_va);
1430 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1431 write_stag, (unsigned long long)write_va);
1432 }
1433
1434 isert_dbg("ISER ISCSI_CTRL PDU\n");
1435 break;
1436 case ISER_HELLO:
1437 isert_err("iSER Hello message\n");
1438 break;
1439 default:
1440 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1441 break;
1442 }
1443
1444 isert_rx_opcode(isert_conn, rx_desc,
1445 read_stag, read_va, write_stag, write_va);
1446
1447 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1448 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1449 }
1450
1451 static void
1452 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1453 {
1454 struct isert_conn *isert_conn = wc->qp->qp_context;
1455 struct ib_device *ib_dev = isert_conn->cm_id->device;
1456
1457 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1458 isert_print_wc(wc, "login recv");
1459 return;
1460 }
1461
1462 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1463 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1464
1465 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1466
1467 if (isert_conn->conn) {
1468 struct iscsi_login *login = isert_conn->conn->conn_login;
1469
1470 if (login && !login->first_request)
1471 isert_rx_login_req(isert_conn);
1472 }
1473
1474 mutex_lock(&isert_conn->mutex);
1475 complete(&isert_conn->login_req_comp);
1476 mutex_unlock(&isert_conn->mutex);
1477
1478 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1479 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1480 }
1481
1482 static void
1483 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1484 {
1485 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1486 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1487
1488 if (!cmd->rw.nr_ops)
1489 return;
1490
1491 if (isert_prot_cmd(conn, se_cmd)) {
1492 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1493 conn->cm_id->port_num, se_cmd->t_data_sg,
1494 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1495 se_cmd->t_prot_nents, dir);
1496 } else {
1497 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1498 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1499 }
1500
1501 cmd->rw.nr_ops = 0;
1502 }
1503
1504 static void
1505 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1506 {
1507 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1508 struct isert_conn *isert_conn = isert_cmd->conn;
1509 struct iscsi_conn *conn = isert_conn->conn;
1510 struct iscsi_text_rsp *hdr;
1511
1512 isert_dbg("Cmd %p\n", isert_cmd);
1513
1514 switch (cmd->iscsi_opcode) {
1515 case ISCSI_OP_SCSI_CMD:
1516 spin_lock_bh(&conn->cmd_lock);
1517 if (!list_empty(&cmd->i_conn_node))
1518 list_del_init(&cmd->i_conn_node);
1519 spin_unlock_bh(&conn->cmd_lock);
1520
1521 if (cmd->data_direction == DMA_TO_DEVICE) {
1522 iscsit_stop_dataout_timer(cmd);
1523 /*
1524 * Check for special case during comp_err where
1525 * WRITE_PENDING has been handed off from core,
1526 * but requires an extra target_put_sess_cmd()
1527 * before transport_generic_free_cmd() below.
1528 */
1529 if (comp_err &&
1530 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1531 struct se_cmd *se_cmd = &cmd->se_cmd;
1532
1533 target_put_sess_cmd(se_cmd);
1534 }
1535 }
1536
1537 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1538 transport_generic_free_cmd(&cmd->se_cmd, 0);
1539 break;
1540 case ISCSI_OP_SCSI_TMFUNC:
1541 spin_lock_bh(&conn->cmd_lock);
1542 if (!list_empty(&cmd->i_conn_node))
1543 list_del_init(&cmd->i_conn_node);
1544 spin_unlock_bh(&conn->cmd_lock);
1545
1546 transport_generic_free_cmd(&cmd->se_cmd, 0);
1547 break;
1548 case ISCSI_OP_REJECT:
1549 case ISCSI_OP_NOOP_OUT:
1550 case ISCSI_OP_TEXT:
1551 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1552 /* If the continue bit is on, keep the command alive */
1553 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1554 break;
1555
1556 spin_lock_bh(&conn->cmd_lock);
1557 if (!list_empty(&cmd->i_conn_node))
1558 list_del_init(&cmd->i_conn_node);
1559 spin_unlock_bh(&conn->cmd_lock);
1560
1561 /*
1562 * Handle special case for REJECT when iscsi_add_reject*() has
1563 * overwritten the original iscsi_opcode assignment, and the
1564 * associated cmd->se_cmd needs to be released.
1565 */
1566 if (cmd->se_cmd.se_tfo != NULL) {
1567 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1568 cmd->iscsi_opcode);
1569 transport_generic_free_cmd(&cmd->se_cmd, 0);
1570 break;
1571 }
1572 /*
1573 * Fall-through
1574 */
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 case ISTATE_SEND_REJECT: /* FALLTHRU */
1753 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1754 cmd->i_state = ISTATE_SENT_STATUS;
1755 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1756 ib_dev, false);
1757 break;
1758 case ISTATE_SEND_LOGOUTRSP:
1759 iscsit_logout_post_handler(cmd, cmd->conn);
1760 break;
1761 default:
1762 isert_err("Unknown i_state %d\n", cmd->i_state);
1763 dump_stack();
1764 break;
1765 }
1766 }
1767
1768 static void
1769 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1770 {
1771 struct isert_conn *isert_conn = wc->qp->qp_context;
1772 struct ib_device *ib_dev = isert_conn->cm_id->device;
1773 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1774
1775 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1776 isert_print_wc(wc, "login send");
1777 if (wc->status != IB_WC_WR_FLUSH_ERR)
1778 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1779 }
1780
1781 isert_unmap_tx_desc(tx_desc, ib_dev);
1782 }
1783
1784 static void
1785 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1786 {
1787 struct isert_conn *isert_conn = wc->qp->qp_context;
1788 struct ib_device *ib_dev = isert_conn->cm_id->device;
1789 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1790 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1791
1792 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1793 isert_print_wc(wc, "send");
1794 if (wc->status != IB_WC_WR_FLUSH_ERR)
1795 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1796 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1797 return;
1798 }
1799
1800 isert_dbg("Cmd %p\n", isert_cmd);
1801
1802 switch (isert_cmd->iscsi_cmd->i_state) {
1803 case ISTATE_SEND_TASKMGTRSP:
1804 case ISTATE_SEND_LOGOUTRSP:
1805 case ISTATE_SEND_REJECT:
1806 case ISTATE_SEND_TEXTRSP:
1807 isert_unmap_tx_desc(tx_desc, ib_dev);
1808
1809 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1810 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1811 return;
1812 default:
1813 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1814 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1815 break;
1816 }
1817 }
1818
1819 static int
1820 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1821 {
1822 struct ib_send_wr *wr_failed;
1823 int ret;
1824
1825 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1826 if (ret) {
1827 isert_err("ib_post_recv failed with %d\n", ret);
1828 return ret;
1829 }
1830
1831 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1832 &wr_failed);
1833 if (ret) {
1834 isert_err("ib_post_send failed with %d\n", ret);
1835 return ret;
1836 }
1837 return ret;
1838 }
1839
1840 static int
1841 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1842 {
1843 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1844 struct isert_conn *isert_conn = conn->context;
1845 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1846 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1847 &isert_cmd->tx_desc.iscsi_header;
1848
1849 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1850 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1851 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1852 /*
1853 * Attach SENSE DATA payload to iSCSI Response PDU
1854 */
1855 if (cmd->se_cmd.sense_buffer &&
1856 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1857 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1858 struct isert_device *device = isert_conn->device;
1859 struct ib_device *ib_dev = device->ib_device;
1860 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1861 u32 padding, pdu_len;
1862
1863 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1864 cmd->sense_buffer);
1865 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1866
1867 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1868 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1869 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1870
1871 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1872 (void *)cmd->sense_buffer, pdu_len,
1873 DMA_TO_DEVICE);
1874 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1875 return -ENOMEM;
1876
1877 isert_cmd->pdu_buf_len = pdu_len;
1878 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1879 tx_dsg->length = pdu_len;
1880 tx_dsg->lkey = device->pd->local_dma_lkey;
1881 isert_cmd->tx_desc.num_sge = 2;
1882 }
1883
1884 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1885
1886 isert_dbg("Posting SCSI Response\n");
1887
1888 return isert_post_response(isert_conn, isert_cmd);
1889 }
1890
1891 static void
1892 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1893 {
1894 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895 struct isert_conn *isert_conn = conn->context;
1896
1897 spin_lock_bh(&conn->cmd_lock);
1898 if (!list_empty(&cmd->i_conn_node))
1899 list_del_init(&cmd->i_conn_node);
1900 spin_unlock_bh(&conn->cmd_lock);
1901
1902 if (cmd->data_direction == DMA_TO_DEVICE)
1903 iscsit_stop_dataout_timer(cmd);
1904 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1905 }
1906
1907 static enum target_prot_op
1908 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1909 {
1910 struct isert_conn *isert_conn = conn->context;
1911 struct isert_device *device = isert_conn->device;
1912
1913 if (conn->tpg->tpg_attrib.t10_pi) {
1914 if (device->pi_capable) {
1915 isert_info("conn %p PI offload enabled\n", isert_conn);
1916 isert_conn->pi_support = true;
1917 return TARGET_PROT_ALL;
1918 }
1919 }
1920
1921 isert_info("conn %p PI offload disabled\n", isert_conn);
1922 isert_conn->pi_support = false;
1923
1924 return TARGET_PROT_NORMAL;
1925 }
1926
1927 static int
1928 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1929 bool nopout_response)
1930 {
1931 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1932 struct isert_conn *isert_conn = conn->context;
1933 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1934
1935 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1937 &isert_cmd->tx_desc.iscsi_header,
1938 nopout_response);
1939 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1940 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1941
1942 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1943
1944 return isert_post_response(isert_conn, isert_cmd);
1945 }
1946
1947 static int
1948 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1949 {
1950 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1951 struct isert_conn *isert_conn = conn->context;
1952 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1953
1954 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1955 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1956 &isert_cmd->tx_desc.iscsi_header);
1957 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1958 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1959
1960 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1961
1962 return isert_post_response(isert_conn, isert_cmd);
1963 }
1964
1965 static int
1966 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1967 {
1968 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1969 struct isert_conn *isert_conn = conn->context;
1970 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1971
1972 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1973 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1974 &isert_cmd->tx_desc.iscsi_header);
1975 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1977
1978 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1979
1980 return isert_post_response(isert_conn, isert_cmd);
1981 }
1982
1983 static int
1984 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1985 {
1986 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1987 struct isert_conn *isert_conn = conn->context;
1988 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1989 struct isert_device *device = isert_conn->device;
1990 struct ib_device *ib_dev = device->ib_device;
1991 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1992 struct iscsi_reject *hdr =
1993 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1994
1995 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1996 iscsit_build_reject(cmd, conn, hdr);
1997 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1998
1999 hton24(hdr->dlength, ISCSI_HDR_LEN);
2000 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2001 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2002 DMA_TO_DEVICE);
2003 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2004 return -ENOMEM;
2005 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2006 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2007 tx_dsg->length = ISCSI_HDR_LEN;
2008 tx_dsg->lkey = device->pd->local_dma_lkey;
2009 isert_cmd->tx_desc.num_sge = 2;
2010
2011 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2012
2013 isert_dbg("conn %p Posting Reject\n", isert_conn);
2014
2015 return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static int
2019 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2020 {
2021 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2022 struct isert_conn *isert_conn = conn->context;
2023 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2024 struct iscsi_text_rsp *hdr =
2025 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2026 u32 txt_rsp_len;
2027 int rc;
2028
2029 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2030 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2031 if (rc < 0)
2032 return rc;
2033
2034 txt_rsp_len = rc;
2035 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2036
2037 if (txt_rsp_len) {
2038 struct isert_device *device = isert_conn->device;
2039 struct ib_device *ib_dev = device->ib_device;
2040 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2041 void *txt_rsp_buf = cmd->buf_ptr;
2042
2043 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2044 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2045 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2046 return -ENOMEM;
2047
2048 isert_cmd->pdu_buf_len = txt_rsp_len;
2049 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2050 tx_dsg->length = txt_rsp_len;
2051 tx_dsg->lkey = device->pd->local_dma_lkey;
2052 isert_cmd->tx_desc.num_sge = 2;
2053 }
2054 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2055
2056 isert_dbg("conn %p Text Response\n", isert_conn);
2057
2058 return isert_post_response(isert_conn, isert_cmd);
2059 }
2060
2061 static inline void
2062 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2063 struct ib_sig_domain *domain)
2064 {
2065 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2066 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2067 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2068 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2069 /*
2070 * At the moment we hard code those, but if in the future
2071 * the target core would like to use it, we will take it
2072 * from se_cmd.
2073 */
2074 domain->sig.dif.apptag_check_mask = 0xffff;
2075 domain->sig.dif.app_escape = true;
2076 domain->sig.dif.ref_escape = true;
2077 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2078 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2079 domain->sig.dif.ref_remap = true;
2080 };
2081
2082 static int
2083 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2084 {
2085 memset(sig_attrs, 0, sizeof(*sig_attrs));
2086
2087 switch (se_cmd->prot_op) {
2088 case TARGET_PROT_DIN_INSERT:
2089 case TARGET_PROT_DOUT_STRIP:
2090 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2091 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2092 break;
2093 case TARGET_PROT_DOUT_INSERT:
2094 case TARGET_PROT_DIN_STRIP:
2095 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2096 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2097 break;
2098 case TARGET_PROT_DIN_PASS:
2099 case TARGET_PROT_DOUT_PASS:
2100 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2101 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2102 break;
2103 default:
2104 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2105 return -EINVAL;
2106 }
2107
2108 sig_attrs->check_mask =
2109 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2110 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2111 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2112 return 0;
2113 }
2114
2115 static int
2116 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2117 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2118 {
2119 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2120 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2121 u8 port_num = conn->cm_id->port_num;
2122 u64 addr;
2123 u32 rkey, offset;
2124 int ret;
2125
2126 if (dir == DMA_FROM_DEVICE) {
2127 addr = cmd->write_va;
2128 rkey = cmd->write_stag;
2129 offset = cmd->iscsi_cmd->write_data_done;
2130 } else {
2131 addr = cmd->read_va;
2132 rkey = cmd->read_stag;
2133 offset = 0;
2134 }
2135
2136 if (isert_prot_cmd(conn, se_cmd)) {
2137 struct ib_sig_attrs sig_attrs;
2138
2139 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2140 if (ret)
2141 return ret;
2142
2143 WARN_ON_ONCE(offset);
2144 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2145 se_cmd->t_data_sg, se_cmd->t_data_nents,
2146 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2147 &sig_attrs, addr, rkey, dir);
2148 } else {
2149 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2150 se_cmd->t_data_sg, se_cmd->t_data_nents,
2151 offset, addr, rkey, dir);
2152 }
2153 if (ret < 0) {
2154 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2155 return ret;
2156 }
2157
2158 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2159 if (ret < 0)
2160 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2161 return ret;
2162 }
2163
2164 static int
2165 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2166 {
2167 struct se_cmd *se_cmd = &cmd->se_cmd;
2168 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2169 struct isert_conn *isert_conn = conn->context;
2170 struct ib_cqe *cqe = NULL;
2171 struct ib_send_wr *chain_wr = NULL;
2172 int rc;
2173
2174 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2175 isert_cmd, se_cmd->data_length);
2176
2177 if (isert_prot_cmd(isert_conn, se_cmd)) {
2178 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2179 cqe = &isert_cmd->tx_desc.tx_cqe;
2180 } else {
2181 /*
2182 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2183 */
2184 isert_create_send_desc(isert_conn, isert_cmd,
2185 &isert_cmd->tx_desc);
2186 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2187 &isert_cmd->tx_desc.iscsi_header);
2188 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2189 isert_init_send_wr(isert_conn, isert_cmd,
2190 &isert_cmd->tx_desc.send_wr);
2191
2192 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2193 if (rc) {
2194 isert_err("ib_post_recv failed with %d\n", rc);
2195 return rc;
2196 }
2197
2198 chain_wr = &isert_cmd->tx_desc.send_wr;
2199 }
2200
2201 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2202 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2203 isert_cmd, rc);
2204 return rc;
2205 }
2206
2207 static int
2208 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2209 {
2210 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2211 int ret;
2212
2213 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2214 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2215
2216 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2217 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2218 &isert_cmd->tx_desc.tx_cqe, NULL);
2219
2220 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2221 isert_cmd, ret);
2222 return ret;
2223 }
2224
2225 static int
2226 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2227 {
2228 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2229 int ret = 0;
2230
2231 switch (state) {
2232 case ISTATE_REMOVE:
2233 spin_lock_bh(&conn->cmd_lock);
2234 list_del_init(&cmd->i_conn_node);
2235 spin_unlock_bh(&conn->cmd_lock);
2236 isert_put_cmd(isert_cmd, true);
2237 break;
2238 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2239 ret = isert_put_nopin(cmd, conn, false);
2240 break;
2241 default:
2242 isert_err("Unknown immediate state: 0x%02x\n", state);
2243 ret = -EINVAL;
2244 break;
2245 }
2246
2247 return ret;
2248 }
2249
2250 static int
2251 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2252 {
2253 struct isert_conn *isert_conn = conn->context;
2254 int ret;
2255
2256 switch (state) {
2257 case ISTATE_SEND_LOGOUTRSP:
2258 ret = isert_put_logout_rsp(cmd, conn);
2259 if (!ret)
2260 isert_conn->logout_posted = true;
2261 break;
2262 case ISTATE_SEND_NOPIN:
2263 ret = isert_put_nopin(cmd, conn, true);
2264 break;
2265 case ISTATE_SEND_TASKMGTRSP:
2266 ret = isert_put_tm_rsp(cmd, conn);
2267 break;
2268 case ISTATE_SEND_REJECT:
2269 ret = isert_put_reject(cmd, conn);
2270 break;
2271 case ISTATE_SEND_TEXTRSP:
2272 ret = isert_put_text_rsp(cmd, conn);
2273 break;
2274 case ISTATE_SEND_STATUS:
2275 /*
2276 * Special case for sending non GOOD SCSI status from TX thread
2277 * context during pre se_cmd excecution failure.
2278 */
2279 ret = isert_put_response(conn, cmd);
2280 break;
2281 default:
2282 isert_err("Unknown response state: 0x%02x\n", state);
2283 ret = -EINVAL;
2284 break;
2285 }
2286
2287 return ret;
2288 }
2289
2290 struct rdma_cm_id *
2291 isert_setup_id(struct isert_np *isert_np)
2292 {
2293 struct iscsi_np *np = isert_np->np;
2294 struct rdma_cm_id *id;
2295 struct sockaddr *sa;
2296 int ret;
2297
2298 sa = (struct sockaddr *)&np->np_sockaddr;
2299 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2300
2301 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2302 RDMA_PS_TCP, IB_QPT_RC);
2303 if (IS_ERR(id)) {
2304 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2305 ret = PTR_ERR(id);
2306 goto out;
2307 }
2308 isert_dbg("id %p context %p\n", id, id->context);
2309
2310 ret = rdma_bind_addr(id, sa);
2311 if (ret) {
2312 isert_err("rdma_bind_addr() failed: %d\n", ret);
2313 goto out_id;
2314 }
2315
2316 ret = rdma_listen(id, 0);
2317 if (ret) {
2318 isert_err("rdma_listen() failed: %d\n", ret);
2319 goto out_id;
2320 }
2321
2322 return id;
2323 out_id:
2324 rdma_destroy_id(id);
2325 out:
2326 return ERR_PTR(ret);
2327 }
2328
2329 static int
2330 isert_setup_np(struct iscsi_np *np,
2331 struct sockaddr_storage *ksockaddr)
2332 {
2333 struct isert_np *isert_np;
2334 struct rdma_cm_id *isert_lid;
2335 int ret;
2336
2337 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2338 if (!isert_np)
2339 return -ENOMEM;
2340
2341 sema_init(&isert_np->sem, 0);
2342 mutex_init(&isert_np->mutex);
2343 INIT_LIST_HEAD(&isert_np->accepted);
2344 INIT_LIST_HEAD(&isert_np->pending);
2345 isert_np->np = np;
2346
2347 /*
2348 * Setup the np->np_sockaddr from the passed sockaddr setup
2349 * in iscsi_target_configfs.c code..
2350 */
2351 memcpy(&np->np_sockaddr, ksockaddr,
2352 sizeof(struct sockaddr_storage));
2353
2354 isert_lid = isert_setup_id(isert_np);
2355 if (IS_ERR(isert_lid)) {
2356 ret = PTR_ERR(isert_lid);
2357 goto out;
2358 }
2359
2360 isert_np->cm_id = isert_lid;
2361 np->np_context = isert_np;
2362
2363 return 0;
2364
2365 out:
2366 kfree(isert_np);
2367
2368 return ret;
2369 }
2370
2371 static int
2372 isert_rdma_accept(struct isert_conn *isert_conn)
2373 {
2374 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2375 struct rdma_conn_param cp;
2376 int ret;
2377 struct iser_cm_hdr rsp_hdr;
2378
2379 memset(&cp, 0, sizeof(struct rdma_conn_param));
2380 cp.initiator_depth = isert_conn->initiator_depth;
2381 cp.retry_count = 7;
2382 cp.rnr_retry_count = 7;
2383
2384 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2385 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2386 if (!isert_conn->snd_w_inv)
2387 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2388 cp.private_data = (void *)&rsp_hdr;
2389 cp.private_data_len = sizeof(rsp_hdr);
2390
2391 ret = rdma_accept(cm_id, &cp);
2392 if (ret) {
2393 isert_err("rdma_accept() failed with: %d\n", ret);
2394 return ret;
2395 }
2396
2397 return 0;
2398 }
2399
2400 static int
2401 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2402 {
2403 struct isert_conn *isert_conn = conn->context;
2404 int ret;
2405
2406 isert_info("before login_req comp conn: %p\n", isert_conn);
2407 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2408 if (ret) {
2409 isert_err("isert_conn %p interrupted before got login req\n",
2410 isert_conn);
2411 return ret;
2412 }
2413 reinit_completion(&isert_conn->login_req_comp);
2414
2415 /*
2416 * For login requests after the first PDU, isert_rx_login_req() will
2417 * kick schedule_delayed_work(&conn->login_work) as the packet is
2418 * received, which turns this callback from iscsi_target_do_login_rx()
2419 * into a NOP.
2420 */
2421 if (!login->first_request)
2422 return 0;
2423
2424 isert_rx_login_req(isert_conn);
2425
2426 isert_info("before login_comp conn: %p\n", conn);
2427 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2428 if (ret)
2429 return ret;
2430
2431 isert_info("processing login->req: %p\n", login->req);
2432
2433 return 0;
2434 }
2435
2436 static void
2437 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2438 struct isert_conn *isert_conn)
2439 {
2440 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2441 struct rdma_route *cm_route = &cm_id->route;
2442
2443 conn->login_family = np->np_sockaddr.ss_family;
2444
2445 conn->login_sockaddr = cm_route->addr.dst_addr;
2446 conn->local_sockaddr = cm_route->addr.src_addr;
2447 }
2448
2449 static int
2450 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2451 {
2452 struct isert_np *isert_np = np->np_context;
2453 struct isert_conn *isert_conn;
2454 int ret;
2455
2456 accept_wait:
2457 ret = down_interruptible(&isert_np->sem);
2458 if (ret)
2459 return -ENODEV;
2460
2461 spin_lock_bh(&np->np_thread_lock);
2462 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2463 spin_unlock_bh(&np->np_thread_lock);
2464 isert_dbg("np_thread_state %d\n",
2465 np->np_thread_state);
2466 /**
2467 * No point in stalling here when np_thread
2468 * is in state RESET/SHUTDOWN/EXIT - bail
2469 **/
2470 return -ENODEV;
2471 }
2472 spin_unlock_bh(&np->np_thread_lock);
2473
2474 mutex_lock(&isert_np->mutex);
2475 if (list_empty(&isert_np->pending)) {
2476 mutex_unlock(&isert_np->mutex);
2477 goto accept_wait;
2478 }
2479 isert_conn = list_first_entry(&isert_np->pending,
2480 struct isert_conn, node);
2481 list_del_init(&isert_conn->node);
2482 mutex_unlock(&isert_np->mutex);
2483
2484 conn->context = isert_conn;
2485 isert_conn->conn = conn;
2486 isert_conn->state = ISER_CONN_BOUND;
2487
2488 isert_set_conn_info(np, conn, isert_conn);
2489
2490 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2491
2492 return 0;
2493 }
2494
2495 static void
2496 isert_free_np(struct iscsi_np *np)
2497 {
2498 struct isert_np *isert_np = np->np_context;
2499 struct isert_conn *isert_conn, *n;
2500
2501 if (isert_np->cm_id)
2502 rdma_destroy_id(isert_np->cm_id);
2503
2504 /*
2505 * FIXME: At this point we don't have a good way to insure
2506 * that at this point we don't have hanging connections that
2507 * completed RDMA establishment but didn't start iscsi login
2508 * process. So work-around this by cleaning up what ever piled
2509 * up in accepted and pending lists.
2510 */
2511 mutex_lock(&isert_np->mutex);
2512 if (!list_empty(&isert_np->pending)) {
2513 isert_info("Still have isert pending connections\n");
2514 list_for_each_entry_safe(isert_conn, n,
2515 &isert_np->pending,
2516 node) {
2517 isert_info("cleaning isert_conn %p state (%d)\n",
2518 isert_conn, isert_conn->state);
2519 isert_connect_release(isert_conn);
2520 }
2521 }
2522
2523 if (!list_empty(&isert_np->accepted)) {
2524 isert_info("Still have isert accepted connections\n");
2525 list_for_each_entry_safe(isert_conn, n,
2526 &isert_np->accepted,
2527 node) {
2528 isert_info("cleaning isert_conn %p state (%d)\n",
2529 isert_conn, isert_conn->state);
2530 isert_connect_release(isert_conn);
2531 }
2532 }
2533 mutex_unlock(&isert_np->mutex);
2534
2535 np->np_context = NULL;
2536 kfree(isert_np);
2537 }
2538
2539 static void isert_release_work(struct work_struct *work)
2540 {
2541 struct isert_conn *isert_conn = container_of(work,
2542 struct isert_conn,
2543 release_work);
2544
2545 isert_info("Starting release conn %p\n", isert_conn);
2546
2547 mutex_lock(&isert_conn->mutex);
2548 isert_conn->state = ISER_CONN_DOWN;
2549 mutex_unlock(&isert_conn->mutex);
2550
2551 isert_info("Destroying conn %p\n", isert_conn);
2552 isert_put_conn(isert_conn);
2553 }
2554
2555 static void
2556 isert_wait4logout(struct isert_conn *isert_conn)
2557 {
2558 struct iscsi_conn *conn = isert_conn->conn;
2559
2560 isert_info("conn %p\n", isert_conn);
2561
2562 if (isert_conn->logout_posted) {
2563 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2564 wait_for_completion_timeout(&conn->conn_logout_comp,
2565 SECONDS_FOR_LOGOUT_COMP * HZ);
2566 }
2567 }
2568
2569 static void
2570 isert_wait4cmds(struct iscsi_conn *conn)
2571 {
2572 isert_info("iscsi_conn %p\n", conn);
2573
2574 if (conn->sess) {
2575 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2576 target_wait_for_sess_cmds(conn->sess->se_sess);
2577 }
2578 }
2579
2580 /**
2581 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2582 * unsolicitate dataout
2583 * @conn: iscsi connection
2584 *
2585 * We might still have commands that are waiting for unsolicited
2586 * dataouts messages. We must put the extra reference on those
2587 * before blocking on the target_wait_for_session_cmds
2588 */
2589 static void
2590 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2591 {
2592 struct iscsi_cmd *cmd, *tmp;
2593 static LIST_HEAD(drop_cmd_list);
2594
2595 spin_lock_bh(&conn->cmd_lock);
2596 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2597 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2598 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2599 (cmd->write_data_done < cmd->se_cmd.data_length))
2600 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2601 }
2602 spin_unlock_bh(&conn->cmd_lock);
2603
2604 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2605 list_del_init(&cmd->i_conn_node);
2606 if (cmd->i_state != ISTATE_REMOVE) {
2607 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2608
2609 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2610 isert_put_cmd(isert_cmd, true);
2611 }
2612 }
2613 }
2614
2615 static void isert_wait_conn(struct iscsi_conn *conn)
2616 {
2617 struct isert_conn *isert_conn = conn->context;
2618
2619 isert_info("Starting conn %p\n", isert_conn);
2620
2621 mutex_lock(&isert_conn->mutex);
2622 isert_conn_terminate(isert_conn);
2623 mutex_unlock(&isert_conn->mutex);
2624
2625 ib_drain_qp(isert_conn->qp);
2626 isert_put_unsol_pending_cmds(conn);
2627 isert_wait4cmds(conn);
2628 isert_wait4logout(isert_conn);
2629
2630 queue_work(isert_release_wq, &isert_conn->release_work);
2631 }
2632
2633 static void isert_free_conn(struct iscsi_conn *conn)
2634 {
2635 struct isert_conn *isert_conn = conn->context;
2636
2637 ib_drain_qp(isert_conn->qp);
2638 isert_put_conn(isert_conn);
2639 }
2640
2641 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2642 {
2643 struct completion comp;
2644
2645 init_completion(&comp);
2646
2647 wait_for_completion_interruptible(&comp);
2648 }
2649
2650 static struct iscsit_transport iser_target_transport = {
2651 .name = "IB/iSER",
2652 .transport_type = ISCSI_INFINIBAND,
2653 .rdma_shutdown = true,
2654 .priv_size = sizeof(struct isert_cmd),
2655 .owner = THIS_MODULE,
2656 .iscsit_setup_np = isert_setup_np,
2657 .iscsit_accept_np = isert_accept_np,
2658 .iscsit_free_np = isert_free_np,
2659 .iscsit_wait_conn = isert_wait_conn,
2660 .iscsit_free_conn = isert_free_conn,
2661 .iscsit_get_login_rx = isert_get_login_rx,
2662 .iscsit_put_login_tx = isert_put_login_tx,
2663 .iscsit_immediate_queue = isert_immediate_queue,
2664 .iscsit_response_queue = isert_response_queue,
2665 .iscsit_get_dataout = isert_get_dataout,
2666 .iscsit_queue_data_in = isert_put_datain,
2667 .iscsit_queue_status = isert_put_response,
2668 .iscsit_aborted_task = isert_aborted_task,
2669 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2670 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2671 };
2672
2673 static int __init isert_init(void)
2674 {
2675 int ret;
2676
2677 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2678 WQ_UNBOUND | WQ_HIGHPRI, 0);
2679 if (!isert_comp_wq) {
2680 isert_err("Unable to allocate isert_comp_wq\n");
2681 return -ENOMEM;
2682 }
2683
2684 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2685 WQ_UNBOUND_MAX_ACTIVE);
2686 if (!isert_release_wq) {
2687 isert_err("Unable to allocate isert_release_wq\n");
2688 ret = -ENOMEM;
2689 goto destroy_comp_wq;
2690 }
2691
2692 iscsit_register_transport(&iser_target_transport);
2693 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2694
2695 return 0;
2696
2697 destroy_comp_wq:
2698 destroy_workqueue(isert_comp_wq);
2699
2700 return ret;
2701 }
2702
2703 static void __exit isert_exit(void)
2704 {
2705 flush_scheduled_work();
2706 destroy_workqueue(isert_release_wq);
2707 destroy_workqueue(isert_comp_wq);
2708 iscsit_unregister_transport(&iser_target_transport);
2709 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2710 }
2711
2712 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2713 MODULE_VERSION("1.0");
2714 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2715 MODULE_LICENSE("GPL");
2716
2717 module_init(isert_init);
2718 module_exit(isert_exit);
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