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Merge branch 'keys-asym-keyctl' into keys-next
[deliverable/linux.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
23 #include <linux/in.h>
24 #include <linux/in6.h>
25 #include <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 goto fail;
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 fail:
217 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
218
219 return -ENOMEM;
220 }
221
222 static void
223 isert_free_rx_descriptors(struct isert_conn *isert_conn)
224 {
225 struct ib_device *ib_dev = isert_conn->device->ib_device;
226 struct iser_rx_desc *rx_desc;
227 int i;
228
229 if (!isert_conn->rx_descs)
230 return;
231
232 rx_desc = isert_conn->rx_descs;
233 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
234 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
235 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
236 }
237
238 kfree(isert_conn->rx_descs);
239 isert_conn->rx_descs = NULL;
240 }
241
242 static void
243 isert_free_comps(struct isert_device *device)
244 {
245 int i;
246
247 for (i = 0; i < device->comps_used; i++) {
248 struct isert_comp *comp = &device->comps[i];
249
250 if (comp->cq)
251 ib_free_cq(comp->cq);
252 }
253 kfree(device->comps);
254 }
255
256 static int
257 isert_alloc_comps(struct isert_device *device)
258 {
259 int i, max_cqe, ret = 0;
260
261 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
262 device->ib_device->num_comp_vectors));
263
264 isert_info("Using %d CQs, %s supports %d vectors support "
265 "pi_capable %d\n",
266 device->comps_used, device->ib_device->name,
267 device->ib_device->num_comp_vectors,
268 device->pi_capable);
269
270 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
271 GFP_KERNEL);
272 if (!device->comps) {
273 isert_err("Unable to allocate completion contexts\n");
274 return -ENOMEM;
275 }
276
277 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
278
279 for (i = 0; i < device->comps_used; i++) {
280 struct isert_comp *comp = &device->comps[i];
281
282 comp->device = device;
283 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
284 IB_POLL_WORKQUEUE);
285 if (IS_ERR(comp->cq)) {
286 isert_err("Unable to allocate cq\n");
287 ret = PTR_ERR(comp->cq);
288 comp->cq = NULL;
289 goto out_cq;
290 }
291 }
292
293 return 0;
294 out_cq:
295 isert_free_comps(device);
296 return ret;
297 }
298
299 static int
300 isert_create_device_ib_res(struct isert_device *device)
301 {
302 struct ib_device *ib_dev = device->ib_device;
303 int ret;
304
305 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
306 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
307
308 ret = isert_alloc_comps(device);
309 if (ret)
310 goto out;
311
312 device->pd = ib_alloc_pd(ib_dev);
313 if (IS_ERR(device->pd)) {
314 ret = PTR_ERR(device->pd);
315 isert_err("failed to allocate pd, device %p, ret=%d\n",
316 device, ret);
317 goto out_cq;
318 }
319
320 /* Check signature cap */
321 device->pi_capable = ib_dev->attrs.device_cap_flags &
322 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
323
324 return 0;
325
326 out_cq:
327 isert_free_comps(device);
328 out:
329 if (ret > 0)
330 ret = -EINVAL;
331 return ret;
332 }
333
334 static void
335 isert_free_device_ib_res(struct isert_device *device)
336 {
337 isert_info("device %p\n", device);
338
339 ib_dealloc_pd(device->pd);
340 isert_free_comps(device);
341 }
342
343 static void
344 isert_device_put(struct isert_device *device)
345 {
346 mutex_lock(&device_list_mutex);
347 device->refcount--;
348 isert_info("device %p refcount %d\n", device, device->refcount);
349 if (!device->refcount) {
350 isert_free_device_ib_res(device);
351 list_del(&device->dev_node);
352 kfree(device);
353 }
354 mutex_unlock(&device_list_mutex);
355 }
356
357 static struct isert_device *
358 isert_device_get(struct rdma_cm_id *cma_id)
359 {
360 struct isert_device *device;
361 int ret;
362
363 mutex_lock(&device_list_mutex);
364 list_for_each_entry(device, &device_list, dev_node) {
365 if (device->ib_device->node_guid == cma_id->device->node_guid) {
366 device->refcount++;
367 isert_info("Found iser device %p refcount %d\n",
368 device, device->refcount);
369 mutex_unlock(&device_list_mutex);
370 return device;
371 }
372 }
373
374 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
375 if (!device) {
376 mutex_unlock(&device_list_mutex);
377 return ERR_PTR(-ENOMEM);
378 }
379
380 INIT_LIST_HEAD(&device->dev_node);
381
382 device->ib_device = cma_id->device;
383 ret = isert_create_device_ib_res(device);
384 if (ret) {
385 kfree(device);
386 mutex_unlock(&device_list_mutex);
387 return ERR_PTR(ret);
388 }
389
390 device->refcount++;
391 list_add_tail(&device->dev_node, &device_list);
392 isert_info("Created a new iser device %p refcount %d\n",
393 device, device->refcount);
394 mutex_unlock(&device_list_mutex);
395
396 return device;
397 }
398
399 static void
400 isert_init_conn(struct isert_conn *isert_conn)
401 {
402 isert_conn->state = ISER_CONN_INIT;
403 INIT_LIST_HEAD(&isert_conn->node);
404 init_completion(&isert_conn->login_comp);
405 init_completion(&isert_conn->login_req_comp);
406 kref_init(&isert_conn->kref);
407 mutex_init(&isert_conn->mutex);
408 INIT_WORK(&isert_conn->release_work, isert_release_work);
409 }
410
411 static void
412 isert_free_login_buf(struct isert_conn *isert_conn)
413 {
414 struct ib_device *ib_dev = isert_conn->device->ib_device;
415
416 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
417 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
418 kfree(isert_conn->login_rsp_buf);
419
420 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
421 ISER_RX_PAYLOAD_SIZE,
422 DMA_FROM_DEVICE);
423 kfree(isert_conn->login_req_buf);
424 }
425
426 static int
427 isert_alloc_login_buf(struct isert_conn *isert_conn,
428 struct ib_device *ib_dev)
429 {
430 int ret;
431
432 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
433 GFP_KERNEL);
434 if (!isert_conn->login_req_buf) {
435 isert_err("Unable to allocate isert_conn->login_buf\n");
436 return -ENOMEM;
437 }
438
439 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
440 isert_conn->login_req_buf,
441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
442 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
443 if (ret) {
444 isert_err("login_req_dma mapping error: %d\n", ret);
445 isert_conn->login_req_dma = 0;
446 goto out_free_login_req_buf;
447 }
448
449 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
450 if (!isert_conn->login_rsp_buf) {
451 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
452 goto out_unmap_login_req_buf;
453 }
454
455 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
456 isert_conn->login_rsp_buf,
457 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
458 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
459 if (ret) {
460 isert_err("login_rsp_dma mapping error: %d\n", ret);
461 isert_conn->login_rsp_dma = 0;
462 goto out_free_login_rsp_buf;
463 }
464
465 return 0;
466
467 out_free_login_rsp_buf:
468 kfree(isert_conn->login_rsp_buf);
469 out_unmap_login_req_buf:
470 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
471 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
472 out_free_login_req_buf:
473 kfree(isert_conn->login_req_buf);
474 return ret;
475 }
476
477 static void
478 isert_set_nego_params(struct isert_conn *isert_conn,
479 struct rdma_conn_param *param)
480 {
481 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
482
483 /* Set max inflight RDMA READ requests */
484 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
485 attr->max_qp_init_rd_atom);
486 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
487
488 if (param->private_data) {
489 u8 flags = *(u8 *)param->private_data;
490
491 /*
492 * use remote invalidation if the both initiator
493 * and the HCA support it
494 */
495 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
496 (attr->device_cap_flags &
497 IB_DEVICE_MEM_MGT_EXTENSIONS);
498 if (isert_conn->snd_w_inv)
499 isert_info("Using remote invalidation\n");
500 }
501 }
502
503 static int
504 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
505 {
506 struct isert_np *isert_np = cma_id->context;
507 struct iscsi_np *np = isert_np->np;
508 struct isert_conn *isert_conn;
509 struct isert_device *device;
510 int ret = 0;
511
512 spin_lock_bh(&np->np_thread_lock);
513 if (!np->enabled) {
514 spin_unlock_bh(&np->np_thread_lock);
515 isert_dbg("iscsi_np is not enabled, reject connect request\n");
516 return rdma_reject(cma_id, NULL, 0);
517 }
518 spin_unlock_bh(&np->np_thread_lock);
519
520 isert_dbg("cma_id: %p, portal: %p\n",
521 cma_id, cma_id->context);
522
523 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
524 if (!isert_conn)
525 return -ENOMEM;
526
527 isert_init_conn(isert_conn);
528 isert_conn->cm_id = cma_id;
529
530 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
531 if (ret)
532 goto out;
533
534 device = isert_device_get(cma_id);
535 if (IS_ERR(device)) {
536 ret = PTR_ERR(device);
537 goto out_rsp_dma_map;
538 }
539 isert_conn->device = device;
540
541 isert_set_nego_params(isert_conn, &event->param.conn);
542
543 ret = isert_conn_setup_qp(isert_conn, cma_id);
544 if (ret)
545 goto out_conn_dev;
546
547 ret = isert_login_post_recv(isert_conn);
548 if (ret)
549 goto out_conn_dev;
550
551 ret = isert_rdma_accept(isert_conn);
552 if (ret)
553 goto out_conn_dev;
554
555 mutex_lock(&isert_np->mutex);
556 list_add_tail(&isert_conn->node, &isert_np->accepted);
557 mutex_unlock(&isert_np->mutex);
558
559 return 0;
560
561 out_conn_dev:
562 isert_device_put(device);
563 out_rsp_dma_map:
564 isert_free_login_buf(isert_conn);
565 out:
566 kfree(isert_conn);
567 rdma_reject(cma_id, NULL, 0);
568 return ret;
569 }
570
571 static void
572 isert_connect_release(struct isert_conn *isert_conn)
573 {
574 struct isert_device *device = isert_conn->device;
575
576 isert_dbg("conn %p\n", isert_conn);
577
578 BUG_ON(!device);
579
580 isert_free_rx_descriptors(isert_conn);
581 if (isert_conn->cm_id)
582 rdma_destroy_id(isert_conn->cm_id);
583
584 if (isert_conn->qp) {
585 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
586
587 isert_comp_put(comp);
588 ib_destroy_qp(isert_conn->qp);
589 }
590
591 if (isert_conn->login_req_buf)
592 isert_free_login_buf(isert_conn);
593
594 isert_device_put(device);
595
596 kfree(isert_conn);
597 }
598
599 static void
600 isert_connected_handler(struct rdma_cm_id *cma_id)
601 {
602 struct isert_conn *isert_conn = cma_id->qp->qp_context;
603 struct isert_np *isert_np = cma_id->context;
604
605 isert_info("conn %p\n", isert_conn);
606
607 mutex_lock(&isert_conn->mutex);
608 isert_conn->state = ISER_CONN_UP;
609 kref_get(&isert_conn->kref);
610 mutex_unlock(&isert_conn->mutex);
611
612 mutex_lock(&isert_np->mutex);
613 list_move_tail(&isert_conn->node, &isert_np->pending);
614 mutex_unlock(&isert_np->mutex);
615
616 isert_info("np %p: Allow accept_np to continue\n", isert_np);
617 up(&isert_np->sem);
618 }
619
620 static void
621 isert_release_kref(struct kref *kref)
622 {
623 struct isert_conn *isert_conn = container_of(kref,
624 struct isert_conn, kref);
625
626 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
627 current->pid);
628
629 isert_connect_release(isert_conn);
630 }
631
632 static void
633 isert_put_conn(struct isert_conn *isert_conn)
634 {
635 kref_put(&isert_conn->kref, isert_release_kref);
636 }
637
638 static void
639 isert_handle_unbound_conn(struct isert_conn *isert_conn)
640 {
641 struct isert_np *isert_np = isert_conn->cm_id->context;
642
643 mutex_lock(&isert_np->mutex);
644 if (!list_empty(&isert_conn->node)) {
645 /*
646 * This means iscsi doesn't know this connection
647 * so schedule a cleanup ourselves
648 */
649 list_del_init(&isert_conn->node);
650 isert_put_conn(isert_conn);
651 queue_work(isert_release_wq, &isert_conn->release_work);
652 }
653 mutex_unlock(&isert_np->mutex);
654 }
655
656 /**
657 * isert_conn_terminate() - Initiate connection termination
658 * @isert_conn: isert connection struct
659 *
660 * Notes:
661 * In case the connection state is BOUND, move state
662 * to TEMINATING and start teardown sequence (rdma_disconnect).
663 * In case the connection state is UP, complete flush as well.
664 *
665 * This routine must be called with mutex held. Thus it is
666 * safe to call multiple times.
667 */
668 static void
669 isert_conn_terminate(struct isert_conn *isert_conn)
670 {
671 int err;
672
673 if (isert_conn->state >= ISER_CONN_TERMINATING)
674 return;
675
676 isert_info("Terminating conn %p state %d\n",
677 isert_conn, isert_conn->state);
678 isert_conn->state = ISER_CONN_TERMINATING;
679 err = rdma_disconnect(isert_conn->cm_id);
680 if (err)
681 isert_warn("Failed rdma_disconnect isert_conn %p\n",
682 isert_conn);
683 }
684
685 static int
686 isert_np_cma_handler(struct isert_np *isert_np,
687 enum rdma_cm_event_type event)
688 {
689 isert_dbg("%s (%d): isert np %p\n",
690 rdma_event_msg(event), event, isert_np);
691
692 switch (event) {
693 case RDMA_CM_EVENT_DEVICE_REMOVAL:
694 isert_np->cm_id = NULL;
695 break;
696 case RDMA_CM_EVENT_ADDR_CHANGE:
697 isert_np->cm_id = isert_setup_id(isert_np);
698 if (IS_ERR(isert_np->cm_id)) {
699 isert_err("isert np %p setup id failed: %ld\n",
700 isert_np, PTR_ERR(isert_np->cm_id));
701 isert_np->cm_id = NULL;
702 }
703 break;
704 default:
705 isert_err("isert np %p Unexpected event %d\n",
706 isert_np, event);
707 }
708
709 return -1;
710 }
711
712 static int
713 isert_disconnected_handler(struct rdma_cm_id *cma_id,
714 enum rdma_cm_event_type event)
715 {
716 struct isert_conn *isert_conn = cma_id->qp->qp_context;
717
718 mutex_lock(&isert_conn->mutex);
719 switch (isert_conn->state) {
720 case ISER_CONN_TERMINATING:
721 break;
722 case ISER_CONN_UP:
723 isert_conn_terminate(isert_conn);
724 ib_drain_qp(isert_conn->qp);
725 isert_handle_unbound_conn(isert_conn);
726 break;
727 case ISER_CONN_BOUND:
728 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
729 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
730 break;
731 default:
732 isert_warn("conn %p teminating in state %d\n",
733 isert_conn, isert_conn->state);
734 }
735 mutex_unlock(&isert_conn->mutex);
736
737 return 0;
738 }
739
740 static int
741 isert_connect_error(struct rdma_cm_id *cma_id)
742 {
743 struct isert_conn *isert_conn = cma_id->qp->qp_context;
744
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 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_DEVICE_REMOVAL: /* 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_REJECTED: /* FALLTHRU */
781 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
782 case RDMA_CM_EVENT_CONNECT_ERROR:
783 ret = isert_connect_error(cma_id);
784 break;
785 default:
786 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
787 break;
788 }
789
790 return ret;
791 }
792
793 static int
794 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
795 {
796 struct ib_recv_wr *rx_wr, *rx_wr_failed;
797 int i, ret;
798 struct iser_rx_desc *rx_desc;
799
800 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
801 rx_desc = &isert_conn->rx_descs[i];
802
803 rx_wr->wr_cqe = &rx_desc->rx_cqe;
804 rx_wr->sg_list = &rx_desc->rx_sg;
805 rx_wr->num_sge = 1;
806 rx_wr->next = rx_wr + 1;
807 }
808 rx_wr--;
809 rx_wr->next = NULL; /* mark end of work requests list */
810
811 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
812 &rx_wr_failed);
813 if (ret)
814 isert_err("ib_post_recv() failed with ret: %d\n", ret);
815
816 return ret;
817 }
818
819 static int
820 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
821 {
822 struct ib_recv_wr *rx_wr_failed, rx_wr;
823 int ret;
824
825 rx_wr.wr_cqe = &rx_desc->rx_cqe;
826 rx_wr.sg_list = &rx_desc->rx_sg;
827 rx_wr.num_sge = 1;
828 rx_wr.next = NULL;
829
830 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
831 if (ret)
832 isert_err("ib_post_recv() failed with ret: %d\n", ret);
833
834 return ret;
835 }
836
837 static int
838 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
839 {
840 struct ib_device *ib_dev = isert_conn->cm_id->device;
841 struct ib_send_wr send_wr, *send_wr_failed;
842 int ret;
843
844 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
845 ISER_HEADERS_LEN, DMA_TO_DEVICE);
846
847 tx_desc->tx_cqe.done = isert_login_send_done;
848
849 send_wr.next = NULL;
850 send_wr.wr_cqe = &tx_desc->tx_cqe;
851 send_wr.sg_list = tx_desc->tx_sg;
852 send_wr.num_sge = tx_desc->num_sge;
853 send_wr.opcode = IB_WR_SEND;
854 send_wr.send_flags = IB_SEND_SIGNALED;
855
856 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
857 if (ret)
858 isert_err("ib_post_send() failed, ret: %d\n", ret);
859
860 return ret;
861 }
862
863 static void
864 isert_create_send_desc(struct isert_conn *isert_conn,
865 struct isert_cmd *isert_cmd,
866 struct iser_tx_desc *tx_desc)
867 {
868 struct isert_device *device = isert_conn->device;
869 struct ib_device *ib_dev = device->ib_device;
870
871 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
872 ISER_HEADERS_LEN, DMA_TO_DEVICE);
873
874 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
875 tx_desc->iser_header.flags = ISCSI_CTRL;
876
877 tx_desc->num_sge = 1;
878
879 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
880 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
881 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
882 }
883 }
884
885 static int
886 isert_init_tx_hdrs(struct isert_conn *isert_conn,
887 struct iser_tx_desc *tx_desc)
888 {
889 struct isert_device *device = isert_conn->device;
890 struct ib_device *ib_dev = device->ib_device;
891 u64 dma_addr;
892
893 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
894 ISER_HEADERS_LEN, DMA_TO_DEVICE);
895 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
896 isert_err("ib_dma_mapping_error() failed\n");
897 return -ENOMEM;
898 }
899
900 tx_desc->dma_addr = dma_addr;
901 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
902 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
903 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
904
905 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
906 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
907 tx_desc->tx_sg[0].lkey);
908
909 return 0;
910 }
911
912 static void
913 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
914 struct ib_send_wr *send_wr)
915 {
916 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
917
918 tx_desc->tx_cqe.done = isert_send_done;
919 send_wr->wr_cqe = &tx_desc->tx_cqe;
920
921 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
922 send_wr->opcode = IB_WR_SEND_WITH_INV;
923 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
924 } else {
925 send_wr->opcode = IB_WR_SEND;
926 }
927
928 send_wr->sg_list = &tx_desc->tx_sg[0];
929 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
930 send_wr->send_flags = IB_SEND_SIGNALED;
931 }
932
933 static int
934 isert_login_post_recv(struct isert_conn *isert_conn)
935 {
936 struct ib_recv_wr rx_wr, *rx_wr_fail;
937 struct ib_sge sge;
938 int ret;
939
940 memset(&sge, 0, sizeof(struct ib_sge));
941 sge.addr = isert_conn->login_req_dma;
942 sge.length = ISER_RX_PAYLOAD_SIZE;
943 sge.lkey = isert_conn->device->pd->local_dma_lkey;
944
945 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
946 sge.addr, sge.length, sge.lkey);
947
948 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
949
950 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
951 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
952 rx_wr.sg_list = &sge;
953 rx_wr.num_sge = 1;
954
955 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
956 if (ret)
957 isert_err("ib_post_recv() failed: %d\n", ret);
958
959 return ret;
960 }
961
962 static int
963 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
964 u32 length)
965 {
966 struct isert_conn *isert_conn = conn->context;
967 struct isert_device *device = isert_conn->device;
968 struct ib_device *ib_dev = device->ib_device;
969 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
970 int ret;
971
972 isert_create_send_desc(isert_conn, NULL, tx_desc);
973
974 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
975 sizeof(struct iscsi_hdr));
976
977 isert_init_tx_hdrs(isert_conn, tx_desc);
978
979 if (length > 0) {
980 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
981
982 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
983 length, DMA_TO_DEVICE);
984
985 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
986
987 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
988 length, DMA_TO_DEVICE);
989
990 tx_dsg->addr = isert_conn->login_rsp_dma;
991 tx_dsg->length = length;
992 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
993 tx_desc->num_sge = 2;
994 }
995 if (!login->login_failed) {
996 if (login->login_complete) {
997 ret = isert_alloc_rx_descriptors(isert_conn);
998 if (ret)
999 return ret;
1000
1001 ret = isert_post_recvm(isert_conn,
1002 ISERT_QP_MAX_RECV_DTOS);
1003 if (ret)
1004 return ret;
1005
1006 /* Now we are in FULL_FEATURE phase */
1007 mutex_lock(&isert_conn->mutex);
1008 isert_conn->state = ISER_CONN_FULL_FEATURE;
1009 mutex_unlock(&isert_conn->mutex);
1010 goto post_send;
1011 }
1012
1013 ret = isert_login_post_recv(isert_conn);
1014 if (ret)
1015 return ret;
1016 }
1017 post_send:
1018 ret = isert_login_post_send(isert_conn, tx_desc);
1019 if (ret)
1020 return ret;
1021
1022 return 0;
1023 }
1024
1025 static void
1026 isert_rx_login_req(struct isert_conn *isert_conn)
1027 {
1028 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1029 int rx_buflen = isert_conn->login_req_len;
1030 struct iscsi_conn *conn = isert_conn->conn;
1031 struct iscsi_login *login = conn->conn_login;
1032 int size;
1033
1034 isert_info("conn %p\n", isert_conn);
1035
1036 WARN_ON_ONCE(!login);
1037
1038 if (login->first_request) {
1039 struct iscsi_login_req *login_req =
1040 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1041 /*
1042 * Setup the initial iscsi_login values from the leading
1043 * login request PDU.
1044 */
1045 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1046 login->current_stage =
1047 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1048 >> 2;
1049 login->version_min = login_req->min_version;
1050 login->version_max = login_req->max_version;
1051 memcpy(login->isid, login_req->isid, 6);
1052 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1053 login->init_task_tag = login_req->itt;
1054 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1055 login->cid = be16_to_cpu(login_req->cid);
1056 login->tsih = be16_to_cpu(login_req->tsih);
1057 }
1058
1059 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1060
1061 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1062 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1063 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1064 MAX_KEY_VALUE_PAIRS);
1065 memcpy(login->req_buf, &rx_desc->data[0], size);
1066
1067 if (login->first_request) {
1068 complete(&isert_conn->login_comp);
1069 return;
1070 }
1071 schedule_delayed_work(&conn->login_work, 0);
1072 }
1073
1074 static struct iscsi_cmd
1075 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1076 {
1077 struct isert_conn *isert_conn = conn->context;
1078 struct isert_cmd *isert_cmd;
1079 struct iscsi_cmd *cmd;
1080
1081 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1082 if (!cmd) {
1083 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1084 return NULL;
1085 }
1086 isert_cmd = iscsit_priv_cmd(cmd);
1087 isert_cmd->conn = isert_conn;
1088 isert_cmd->iscsi_cmd = cmd;
1089 isert_cmd->rx_desc = rx_desc;
1090
1091 return cmd;
1092 }
1093
1094 static int
1095 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1096 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1097 struct iser_rx_desc *rx_desc, unsigned char *buf)
1098 {
1099 struct iscsi_conn *conn = isert_conn->conn;
1100 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1101 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1102 bool dump_payload = false;
1103 unsigned int data_len;
1104
1105 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1106 if (rc < 0)
1107 return rc;
1108
1109 imm_data = cmd->immediate_data;
1110 imm_data_len = cmd->first_burst_len;
1111 unsol_data = cmd->unsolicited_data;
1112 data_len = cmd->se_cmd.data_length;
1113
1114 if (imm_data && imm_data_len == data_len)
1115 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1116 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1117 if (rc < 0) {
1118 return 0;
1119 } else if (rc > 0) {
1120 dump_payload = true;
1121 goto sequence_cmd;
1122 }
1123
1124 if (!imm_data)
1125 return 0;
1126
1127 if (imm_data_len != data_len) {
1128 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1129 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1130 &rx_desc->data[0], imm_data_len);
1131 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1132 sg_nents, imm_data_len);
1133 } else {
1134 sg_init_table(&isert_cmd->sg, 1);
1135 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1136 cmd->se_cmd.t_data_nents = 1;
1137 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1138 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1139 imm_data_len);
1140 }
1141
1142 cmd->write_data_done += imm_data_len;
1143
1144 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1145 spin_lock_bh(&cmd->istate_lock);
1146 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1147 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1148 spin_unlock_bh(&cmd->istate_lock);
1149 }
1150
1151 sequence_cmd:
1152 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1153
1154 if (!rc && dump_payload == false && unsol_data)
1155 iscsit_set_unsoliticed_dataout(cmd);
1156 else if (dump_payload && imm_data)
1157 target_put_sess_cmd(&cmd->se_cmd);
1158
1159 return 0;
1160 }
1161
1162 static int
1163 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1164 struct iser_rx_desc *rx_desc, unsigned char *buf)
1165 {
1166 struct scatterlist *sg_start;
1167 struct iscsi_conn *conn = isert_conn->conn;
1168 struct iscsi_cmd *cmd = NULL;
1169 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1170 u32 unsol_data_len = ntoh24(hdr->dlength);
1171 int rc, sg_nents, sg_off, page_off;
1172
1173 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1174 if (rc < 0)
1175 return rc;
1176 else if (!cmd)
1177 return 0;
1178 /*
1179 * FIXME: Unexpected unsolicited_data out
1180 */
1181 if (!cmd->unsolicited_data) {
1182 isert_err("Received unexpected solicited data payload\n");
1183 dump_stack();
1184 return -1;
1185 }
1186
1187 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1188 "write_data_done: %u, data_length: %u\n",
1189 unsol_data_len, cmd->write_data_done,
1190 cmd->se_cmd.data_length);
1191
1192 sg_off = cmd->write_data_done / PAGE_SIZE;
1193 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1194 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1195 page_off = cmd->write_data_done % PAGE_SIZE;
1196 /*
1197 * FIXME: Non page-aligned unsolicited_data out
1198 */
1199 if (page_off) {
1200 isert_err("unexpected non-page aligned data payload\n");
1201 dump_stack();
1202 return -1;
1203 }
1204 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1205 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1206 sg_nents, &rx_desc->data[0], unsol_data_len);
1207
1208 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1209 unsol_data_len);
1210
1211 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1212 if (rc < 0)
1213 return rc;
1214
1215 /*
1216 * multiple data-outs on the same command can arrive -
1217 * so post the buffer before hand
1218 */
1219 rc = isert_post_recv(isert_conn, rx_desc);
1220 if (rc) {
1221 isert_err("ib_post_recv failed with %d\n", rc);
1222 return rc;
1223 }
1224 return 0;
1225 }
1226
1227 static int
1228 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1229 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1230 unsigned char *buf)
1231 {
1232 struct iscsi_conn *conn = isert_conn->conn;
1233 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1234 int rc;
1235
1236 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1237 if (rc < 0)
1238 return rc;
1239 /*
1240 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1241 */
1242
1243 return iscsit_process_nop_out(conn, cmd, hdr);
1244 }
1245
1246 static int
1247 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1248 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1249 struct iscsi_text *hdr)
1250 {
1251 struct iscsi_conn *conn = isert_conn->conn;
1252 u32 payload_length = ntoh24(hdr->dlength);
1253 int rc;
1254 unsigned char *text_in = NULL;
1255
1256 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1257 if (rc < 0)
1258 return rc;
1259
1260 if (payload_length) {
1261 text_in = kzalloc(payload_length, GFP_KERNEL);
1262 if (!text_in) {
1263 isert_err("Unable to allocate text_in of payload_length: %u\n",
1264 payload_length);
1265 return -ENOMEM;
1266 }
1267 }
1268 cmd->text_in_ptr = text_in;
1269
1270 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1271
1272 return iscsit_process_text_cmd(conn, cmd, hdr);
1273 }
1274
1275 static int
1276 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1277 uint32_t read_stag, uint64_t read_va,
1278 uint32_t write_stag, uint64_t write_va)
1279 {
1280 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1281 struct iscsi_conn *conn = isert_conn->conn;
1282 struct iscsi_cmd *cmd;
1283 struct isert_cmd *isert_cmd;
1284 int ret = -EINVAL;
1285 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1286
1287 if (conn->sess->sess_ops->SessionType &&
1288 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1289 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1290 " ignoring\n", opcode);
1291 return 0;
1292 }
1293
1294 switch (opcode) {
1295 case ISCSI_OP_SCSI_CMD:
1296 cmd = isert_allocate_cmd(conn, rx_desc);
1297 if (!cmd)
1298 break;
1299
1300 isert_cmd = iscsit_priv_cmd(cmd);
1301 isert_cmd->read_stag = read_stag;
1302 isert_cmd->read_va = read_va;
1303 isert_cmd->write_stag = write_stag;
1304 isert_cmd->write_va = write_va;
1305 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1306
1307 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1308 rx_desc, (unsigned char *)hdr);
1309 break;
1310 case ISCSI_OP_NOOP_OUT:
1311 cmd = isert_allocate_cmd(conn, rx_desc);
1312 if (!cmd)
1313 break;
1314
1315 isert_cmd = iscsit_priv_cmd(cmd);
1316 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1317 rx_desc, (unsigned char *)hdr);
1318 break;
1319 case ISCSI_OP_SCSI_DATA_OUT:
1320 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1321 (unsigned char *)hdr);
1322 break;
1323 case ISCSI_OP_SCSI_TMFUNC:
1324 cmd = isert_allocate_cmd(conn, rx_desc);
1325 if (!cmd)
1326 break;
1327
1328 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1329 (unsigned char *)hdr);
1330 break;
1331 case ISCSI_OP_LOGOUT:
1332 cmd = isert_allocate_cmd(conn, rx_desc);
1333 if (!cmd)
1334 break;
1335
1336 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1337 break;
1338 case ISCSI_OP_TEXT:
1339 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1340 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1341 else
1342 cmd = isert_allocate_cmd(conn, rx_desc);
1343
1344 if (!cmd)
1345 break;
1346
1347 isert_cmd = iscsit_priv_cmd(cmd);
1348 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1349 rx_desc, (struct iscsi_text *)hdr);
1350 break;
1351 default:
1352 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1353 dump_stack();
1354 break;
1355 }
1356
1357 return ret;
1358 }
1359
1360 static void
1361 isert_print_wc(struct ib_wc *wc, const char *type)
1362 {
1363 if (wc->status != IB_WC_WR_FLUSH_ERR)
1364 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1365 ib_wc_status_msg(wc->status), wc->status,
1366 wc->vendor_err);
1367 else
1368 isert_dbg("%s failure: %s (%d)\n", type,
1369 ib_wc_status_msg(wc->status), wc->status);
1370 }
1371
1372 static void
1373 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1374 {
1375 struct isert_conn *isert_conn = wc->qp->qp_context;
1376 struct ib_device *ib_dev = isert_conn->cm_id->device;
1377 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1378 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1379 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1380 uint64_t read_va = 0, write_va = 0;
1381 uint32_t read_stag = 0, write_stag = 0;
1382
1383 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384 isert_print_wc(wc, "recv");
1385 if (wc->status != IB_WC_WR_FLUSH_ERR)
1386 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1387 return;
1388 }
1389
1390 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1391 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1392
1393 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1394 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1395 (int)(wc->byte_len - ISER_HEADERS_LEN));
1396
1397 switch (iser_ctrl->flags & 0xF0) {
1398 case ISCSI_CTRL:
1399 if (iser_ctrl->flags & ISER_RSV) {
1400 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1401 read_va = be64_to_cpu(iser_ctrl->read_va);
1402 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1403 read_stag, (unsigned long long)read_va);
1404 }
1405 if (iser_ctrl->flags & ISER_WSV) {
1406 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1407 write_va = be64_to_cpu(iser_ctrl->write_va);
1408 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1409 write_stag, (unsigned long long)write_va);
1410 }
1411
1412 isert_dbg("ISER ISCSI_CTRL PDU\n");
1413 break;
1414 case ISER_HELLO:
1415 isert_err("iSER Hello message\n");
1416 break;
1417 default:
1418 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1419 break;
1420 }
1421
1422 isert_rx_opcode(isert_conn, rx_desc,
1423 read_stag, read_va, write_stag, write_va);
1424
1425 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1426 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1427 }
1428
1429 static void
1430 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1431 {
1432 struct isert_conn *isert_conn = wc->qp->qp_context;
1433 struct ib_device *ib_dev = isert_conn->cm_id->device;
1434
1435 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1436 isert_print_wc(wc, "login recv");
1437 return;
1438 }
1439
1440 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1441 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1442
1443 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1444
1445 if (isert_conn->conn) {
1446 struct iscsi_login *login = isert_conn->conn->conn_login;
1447
1448 if (login && !login->first_request)
1449 isert_rx_login_req(isert_conn);
1450 }
1451
1452 mutex_lock(&isert_conn->mutex);
1453 complete(&isert_conn->login_req_comp);
1454 mutex_unlock(&isert_conn->mutex);
1455
1456 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1457 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1458 }
1459
1460 static void
1461 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1462 {
1463 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1464 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1465
1466 if (!cmd->rw.nr_ops)
1467 return;
1468
1469 if (isert_prot_cmd(conn, se_cmd)) {
1470 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1471 conn->cm_id->port_num, se_cmd->t_data_sg,
1472 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1473 se_cmd->t_prot_nents, dir);
1474 } else {
1475 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1476 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1477 }
1478
1479 cmd->rw.nr_ops = 0;
1480 }
1481
1482 static void
1483 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1484 {
1485 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1486 struct isert_conn *isert_conn = isert_cmd->conn;
1487 struct iscsi_conn *conn = isert_conn->conn;
1488 struct iscsi_text_rsp *hdr;
1489
1490 isert_dbg("Cmd %p\n", isert_cmd);
1491
1492 switch (cmd->iscsi_opcode) {
1493 case ISCSI_OP_SCSI_CMD:
1494 spin_lock_bh(&conn->cmd_lock);
1495 if (!list_empty(&cmd->i_conn_node))
1496 list_del_init(&cmd->i_conn_node);
1497 spin_unlock_bh(&conn->cmd_lock);
1498
1499 if (cmd->data_direction == DMA_TO_DEVICE) {
1500 iscsit_stop_dataout_timer(cmd);
1501 /*
1502 * Check for special case during comp_err where
1503 * WRITE_PENDING has been handed off from core,
1504 * but requires an extra target_put_sess_cmd()
1505 * before transport_generic_free_cmd() below.
1506 */
1507 if (comp_err &&
1508 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1509 struct se_cmd *se_cmd = &cmd->se_cmd;
1510
1511 target_put_sess_cmd(se_cmd);
1512 }
1513 }
1514
1515 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1516 transport_generic_free_cmd(&cmd->se_cmd, 0);
1517 break;
1518 case ISCSI_OP_SCSI_TMFUNC:
1519 spin_lock_bh(&conn->cmd_lock);
1520 if (!list_empty(&cmd->i_conn_node))
1521 list_del_init(&cmd->i_conn_node);
1522 spin_unlock_bh(&conn->cmd_lock);
1523
1524 transport_generic_free_cmd(&cmd->se_cmd, 0);
1525 break;
1526 case ISCSI_OP_REJECT:
1527 case ISCSI_OP_NOOP_OUT:
1528 case ISCSI_OP_TEXT:
1529 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1530 /* If the continue bit is on, keep the command alive */
1531 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1532 break;
1533
1534 spin_lock_bh(&conn->cmd_lock);
1535 if (!list_empty(&cmd->i_conn_node))
1536 list_del_init(&cmd->i_conn_node);
1537 spin_unlock_bh(&conn->cmd_lock);
1538
1539 /*
1540 * Handle special case for REJECT when iscsi_add_reject*() has
1541 * overwritten the original iscsi_opcode assignment, and the
1542 * associated cmd->se_cmd needs to be released.
1543 */
1544 if (cmd->se_cmd.se_tfo != NULL) {
1545 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1546 cmd->iscsi_opcode);
1547 transport_generic_free_cmd(&cmd->se_cmd, 0);
1548 break;
1549 }
1550 /*
1551 * Fall-through
1552 */
1553 default:
1554 iscsit_release_cmd(cmd);
1555 break;
1556 }
1557 }
1558
1559 static void
1560 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1561 {
1562 if (tx_desc->dma_addr != 0) {
1563 isert_dbg("unmap single for tx_desc->dma_addr\n");
1564 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1565 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1566 tx_desc->dma_addr = 0;
1567 }
1568 }
1569
1570 static void
1571 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1572 struct ib_device *ib_dev, bool comp_err)
1573 {
1574 if (isert_cmd->pdu_buf_dma != 0) {
1575 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1576 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1577 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1578 isert_cmd->pdu_buf_dma = 0;
1579 }
1580
1581 isert_unmap_tx_desc(tx_desc, ib_dev);
1582 isert_put_cmd(isert_cmd, comp_err);
1583 }
1584
1585 static int
1586 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1587 {
1588 struct ib_mr_status mr_status;
1589 int ret;
1590
1591 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1592 if (ret) {
1593 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1594 goto fail_mr_status;
1595 }
1596
1597 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1598 u64 sec_offset_err;
1599 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1600
1601 switch (mr_status.sig_err.err_type) {
1602 case IB_SIG_BAD_GUARD:
1603 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1604 break;
1605 case IB_SIG_BAD_REFTAG:
1606 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1607 break;
1608 case IB_SIG_BAD_APPTAG:
1609 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1610 break;
1611 }
1612 sec_offset_err = mr_status.sig_err.sig_err_offset;
1613 do_div(sec_offset_err, block_size);
1614 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1615
1616 isert_err("PI error found type %d at sector 0x%llx "
1617 "expected 0x%x vs actual 0x%x\n",
1618 mr_status.sig_err.err_type,
1619 (unsigned long long)se_cmd->bad_sector,
1620 mr_status.sig_err.expected,
1621 mr_status.sig_err.actual);
1622 ret = 1;
1623 }
1624
1625 fail_mr_status:
1626 return ret;
1627 }
1628
1629 static void
1630 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1631 {
1632 struct isert_conn *isert_conn = wc->qp->qp_context;
1633 struct isert_device *device = isert_conn->device;
1634 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1635 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1636 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1637 int ret = 0;
1638
1639 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1640 isert_print_wc(wc, "rdma write");
1641 if (wc->status != IB_WC_WR_FLUSH_ERR)
1642 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1643 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1644 return;
1645 }
1646
1647 isert_dbg("Cmd %p\n", isert_cmd);
1648
1649 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1650 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1651
1652 if (ret)
1653 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1654 else
1655 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1656 }
1657
1658 static void
1659 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1660 {
1661 struct isert_conn *isert_conn = wc->qp->qp_context;
1662 struct isert_device *device = isert_conn->device;
1663 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1664 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1665 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1666 struct se_cmd *se_cmd = &cmd->se_cmd;
1667 int ret = 0;
1668
1669 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1670 isert_print_wc(wc, "rdma read");
1671 if (wc->status != IB_WC_WR_FLUSH_ERR)
1672 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1673 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1674 return;
1675 }
1676
1677 isert_dbg("Cmd %p\n", isert_cmd);
1678
1679 iscsit_stop_dataout_timer(cmd);
1680
1681 if (isert_prot_cmd(isert_conn, se_cmd))
1682 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1683 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1684 cmd->write_data_done = 0;
1685
1686 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1687 spin_lock_bh(&cmd->istate_lock);
1688 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1689 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1690 spin_unlock_bh(&cmd->istate_lock);
1691
1692 if (ret) {
1693 target_put_sess_cmd(se_cmd);
1694 transport_send_check_condition_and_sense(se_cmd,
1695 se_cmd->pi_err, 0);
1696 } else {
1697 target_execute_cmd(se_cmd);
1698 }
1699 }
1700
1701 static void
1702 isert_do_control_comp(struct work_struct *work)
1703 {
1704 struct isert_cmd *isert_cmd = container_of(work,
1705 struct isert_cmd, comp_work);
1706 struct isert_conn *isert_conn = isert_cmd->conn;
1707 struct ib_device *ib_dev = isert_conn->cm_id->device;
1708 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1709
1710 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1711
1712 switch (cmd->i_state) {
1713 case ISTATE_SEND_TASKMGTRSP:
1714 iscsit_tmr_post_handler(cmd, cmd->conn);
1715 case ISTATE_SEND_REJECT: /* FALLTHRU */
1716 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1717 cmd->i_state = ISTATE_SENT_STATUS;
1718 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1719 ib_dev, false);
1720 break;
1721 case ISTATE_SEND_LOGOUTRSP:
1722 iscsit_logout_post_handler(cmd, cmd->conn);
1723 break;
1724 default:
1725 isert_err("Unknown i_state %d\n", cmd->i_state);
1726 dump_stack();
1727 break;
1728 }
1729 }
1730
1731 static void
1732 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1733 {
1734 struct isert_conn *isert_conn = wc->qp->qp_context;
1735 struct ib_device *ib_dev = isert_conn->cm_id->device;
1736 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1737
1738 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1739 isert_print_wc(wc, "login send");
1740 if (wc->status != IB_WC_WR_FLUSH_ERR)
1741 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1742 }
1743
1744 isert_unmap_tx_desc(tx_desc, ib_dev);
1745 }
1746
1747 static void
1748 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1749 {
1750 struct isert_conn *isert_conn = wc->qp->qp_context;
1751 struct ib_device *ib_dev = isert_conn->cm_id->device;
1752 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1753 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1754
1755 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1756 isert_print_wc(wc, "send");
1757 if (wc->status != IB_WC_WR_FLUSH_ERR)
1758 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1759 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1760 return;
1761 }
1762
1763 isert_dbg("Cmd %p\n", isert_cmd);
1764
1765 switch (isert_cmd->iscsi_cmd->i_state) {
1766 case ISTATE_SEND_TASKMGTRSP:
1767 case ISTATE_SEND_LOGOUTRSP:
1768 case ISTATE_SEND_REJECT:
1769 case ISTATE_SEND_TEXTRSP:
1770 isert_unmap_tx_desc(tx_desc, ib_dev);
1771
1772 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1773 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1774 return;
1775 default:
1776 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1777 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1778 break;
1779 }
1780 }
1781
1782 static int
1783 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1784 {
1785 struct ib_send_wr *wr_failed;
1786 int ret;
1787
1788 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1789 if (ret) {
1790 isert_err("ib_post_recv failed with %d\n", ret);
1791 return ret;
1792 }
1793
1794 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1795 &wr_failed);
1796 if (ret) {
1797 isert_err("ib_post_send failed with %d\n", ret);
1798 return ret;
1799 }
1800 return ret;
1801 }
1802
1803 static int
1804 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1805 {
1806 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1807 struct isert_conn *isert_conn = conn->context;
1808 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1809 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1810 &isert_cmd->tx_desc.iscsi_header;
1811
1812 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1813 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1814 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1815 /*
1816 * Attach SENSE DATA payload to iSCSI Response PDU
1817 */
1818 if (cmd->se_cmd.sense_buffer &&
1819 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1820 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1821 struct isert_device *device = isert_conn->device;
1822 struct ib_device *ib_dev = device->ib_device;
1823 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1824 u32 padding, pdu_len;
1825
1826 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1827 cmd->sense_buffer);
1828 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1829
1830 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1831 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1832 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1833
1834 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1835 (void *)cmd->sense_buffer, pdu_len,
1836 DMA_TO_DEVICE);
1837
1838 isert_cmd->pdu_buf_len = pdu_len;
1839 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1840 tx_dsg->length = pdu_len;
1841 tx_dsg->lkey = device->pd->local_dma_lkey;
1842 isert_cmd->tx_desc.num_sge = 2;
1843 }
1844
1845 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1846
1847 isert_dbg("Posting SCSI Response\n");
1848
1849 return isert_post_response(isert_conn, isert_cmd);
1850 }
1851
1852 static void
1853 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1854 {
1855 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1856 struct isert_conn *isert_conn = conn->context;
1857
1858 spin_lock_bh(&conn->cmd_lock);
1859 if (!list_empty(&cmd->i_conn_node))
1860 list_del_init(&cmd->i_conn_node);
1861 spin_unlock_bh(&conn->cmd_lock);
1862
1863 if (cmd->data_direction == DMA_TO_DEVICE)
1864 iscsit_stop_dataout_timer(cmd);
1865 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1866 }
1867
1868 static enum target_prot_op
1869 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1870 {
1871 struct isert_conn *isert_conn = conn->context;
1872 struct isert_device *device = isert_conn->device;
1873
1874 if (conn->tpg->tpg_attrib.t10_pi) {
1875 if (device->pi_capable) {
1876 isert_info("conn %p PI offload enabled\n", isert_conn);
1877 isert_conn->pi_support = true;
1878 return TARGET_PROT_ALL;
1879 }
1880 }
1881
1882 isert_info("conn %p PI offload disabled\n", isert_conn);
1883 isert_conn->pi_support = false;
1884
1885 return TARGET_PROT_NORMAL;
1886 }
1887
1888 static int
1889 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1890 bool nopout_response)
1891 {
1892 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1893 struct isert_conn *isert_conn = conn->context;
1894 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1895
1896 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1897 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1898 &isert_cmd->tx_desc.iscsi_header,
1899 nopout_response);
1900 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1901 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1902
1903 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1904
1905 return isert_post_response(isert_conn, isert_cmd);
1906 }
1907
1908 static int
1909 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1910 {
1911 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1912 struct isert_conn *isert_conn = conn->context;
1913 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1914
1915 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1916 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1917 &isert_cmd->tx_desc.iscsi_header);
1918 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1919 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1920
1921 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1922
1923 return isert_post_response(isert_conn, isert_cmd);
1924 }
1925
1926 static int
1927 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1928 {
1929 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1930 struct isert_conn *isert_conn = conn->context;
1931 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1932
1933 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1934 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1935 &isert_cmd->tx_desc.iscsi_header);
1936 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1937 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1938
1939 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1940
1941 return isert_post_response(isert_conn, isert_cmd);
1942 }
1943
1944 static int
1945 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1946 {
1947 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1948 struct isert_conn *isert_conn = conn->context;
1949 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1950 struct isert_device *device = isert_conn->device;
1951 struct ib_device *ib_dev = device->ib_device;
1952 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1953 struct iscsi_reject *hdr =
1954 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1955
1956 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1957 iscsit_build_reject(cmd, conn, hdr);
1958 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1959
1960 hton24(hdr->dlength, ISCSI_HDR_LEN);
1961 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1962 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1963 DMA_TO_DEVICE);
1964 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1965 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1966 tx_dsg->length = ISCSI_HDR_LEN;
1967 tx_dsg->lkey = device->pd->local_dma_lkey;
1968 isert_cmd->tx_desc.num_sge = 2;
1969
1970 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1971
1972 isert_dbg("conn %p Posting Reject\n", isert_conn);
1973
1974 return isert_post_response(isert_conn, isert_cmd);
1975 }
1976
1977 static int
1978 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1979 {
1980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1981 struct isert_conn *isert_conn = conn->context;
1982 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1983 struct iscsi_text_rsp *hdr =
1984 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1985 u32 txt_rsp_len;
1986 int rc;
1987
1988 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1989 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1990 if (rc < 0)
1991 return rc;
1992
1993 txt_rsp_len = rc;
1994 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1995
1996 if (txt_rsp_len) {
1997 struct isert_device *device = isert_conn->device;
1998 struct ib_device *ib_dev = device->ib_device;
1999 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2000 void *txt_rsp_buf = cmd->buf_ptr;
2001
2002 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2003 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2004
2005 isert_cmd->pdu_buf_len = txt_rsp_len;
2006 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2007 tx_dsg->length = txt_rsp_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 Text Response\n", isert_conn);
2014
2015 return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static inline void
2019 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2020 struct ib_sig_domain *domain)
2021 {
2022 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2023 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2024 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2025 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2026 /*
2027 * At the moment we hard code those, but if in the future
2028 * the target core would like to use it, we will take it
2029 * from se_cmd.
2030 */
2031 domain->sig.dif.apptag_check_mask = 0xffff;
2032 domain->sig.dif.app_escape = true;
2033 domain->sig.dif.ref_escape = true;
2034 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2035 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2036 domain->sig.dif.ref_remap = true;
2037 };
2038
2039 static int
2040 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2041 {
2042 memset(sig_attrs, 0, sizeof(*sig_attrs));
2043
2044 switch (se_cmd->prot_op) {
2045 case TARGET_PROT_DIN_INSERT:
2046 case TARGET_PROT_DOUT_STRIP:
2047 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2048 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2049 break;
2050 case TARGET_PROT_DOUT_INSERT:
2051 case TARGET_PROT_DIN_STRIP:
2052 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2053 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2054 break;
2055 case TARGET_PROT_DIN_PASS:
2056 case TARGET_PROT_DOUT_PASS:
2057 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2058 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2059 break;
2060 default:
2061 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2062 return -EINVAL;
2063 }
2064
2065 sig_attrs->check_mask =
2066 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2067 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2068 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2069 return 0;
2070 }
2071
2072 static int
2073 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2074 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2075 {
2076 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2077 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2078 u8 port_num = conn->cm_id->port_num;
2079 u64 addr;
2080 u32 rkey, offset;
2081 int ret;
2082
2083 if (dir == DMA_FROM_DEVICE) {
2084 addr = cmd->write_va;
2085 rkey = cmd->write_stag;
2086 offset = cmd->iscsi_cmd->write_data_done;
2087 } else {
2088 addr = cmd->read_va;
2089 rkey = cmd->read_stag;
2090 offset = 0;
2091 }
2092
2093 if (isert_prot_cmd(conn, se_cmd)) {
2094 struct ib_sig_attrs sig_attrs;
2095
2096 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2097 if (ret)
2098 return ret;
2099
2100 WARN_ON_ONCE(offset);
2101 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2102 se_cmd->t_data_sg, se_cmd->t_data_nents,
2103 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2104 &sig_attrs, addr, rkey, dir);
2105 } else {
2106 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2107 se_cmd->t_data_sg, se_cmd->t_data_nents,
2108 offset, addr, rkey, dir);
2109 }
2110 if (ret < 0) {
2111 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2112 return ret;
2113 }
2114
2115 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2116 if (ret < 0)
2117 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2118 return ret;
2119 }
2120
2121 static int
2122 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2123 {
2124 struct se_cmd *se_cmd = &cmd->se_cmd;
2125 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2126 struct isert_conn *isert_conn = conn->context;
2127 struct ib_cqe *cqe = NULL;
2128 struct ib_send_wr *chain_wr = NULL;
2129 int rc;
2130
2131 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2132 isert_cmd, se_cmd->data_length);
2133
2134 if (isert_prot_cmd(isert_conn, se_cmd)) {
2135 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2136 cqe = &isert_cmd->tx_desc.tx_cqe;
2137 } else {
2138 /*
2139 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2140 */
2141 isert_create_send_desc(isert_conn, isert_cmd,
2142 &isert_cmd->tx_desc);
2143 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2144 &isert_cmd->tx_desc.iscsi_header);
2145 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2146 isert_init_send_wr(isert_conn, isert_cmd,
2147 &isert_cmd->tx_desc.send_wr);
2148
2149 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2150 if (rc) {
2151 isert_err("ib_post_recv failed with %d\n", rc);
2152 return rc;
2153 }
2154
2155 chain_wr = &isert_cmd->tx_desc.send_wr;
2156 }
2157
2158 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2159 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2160 return 1;
2161 }
2162
2163 static int
2164 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2165 {
2166 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2167
2168 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2169 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2170
2171 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2172 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2173 &isert_cmd->tx_desc.tx_cqe, NULL);
2174
2175 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2176 isert_cmd);
2177 return 0;
2178 }
2179
2180 static int
2181 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2182 {
2183 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2184 int ret = 0;
2185
2186 switch (state) {
2187 case ISTATE_REMOVE:
2188 spin_lock_bh(&conn->cmd_lock);
2189 list_del_init(&cmd->i_conn_node);
2190 spin_unlock_bh(&conn->cmd_lock);
2191 isert_put_cmd(isert_cmd, true);
2192 break;
2193 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2194 ret = isert_put_nopin(cmd, conn, false);
2195 break;
2196 default:
2197 isert_err("Unknown immediate state: 0x%02x\n", state);
2198 ret = -EINVAL;
2199 break;
2200 }
2201
2202 return ret;
2203 }
2204
2205 static int
2206 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2207 {
2208 struct isert_conn *isert_conn = conn->context;
2209 int ret;
2210
2211 switch (state) {
2212 case ISTATE_SEND_LOGOUTRSP:
2213 ret = isert_put_logout_rsp(cmd, conn);
2214 if (!ret)
2215 isert_conn->logout_posted = true;
2216 break;
2217 case ISTATE_SEND_NOPIN:
2218 ret = isert_put_nopin(cmd, conn, true);
2219 break;
2220 case ISTATE_SEND_TASKMGTRSP:
2221 ret = isert_put_tm_rsp(cmd, conn);
2222 break;
2223 case ISTATE_SEND_REJECT:
2224 ret = isert_put_reject(cmd, conn);
2225 break;
2226 case ISTATE_SEND_TEXTRSP:
2227 ret = isert_put_text_rsp(cmd, conn);
2228 break;
2229 case ISTATE_SEND_STATUS:
2230 /*
2231 * Special case for sending non GOOD SCSI status from TX thread
2232 * context during pre se_cmd excecution failure.
2233 */
2234 ret = isert_put_response(conn, cmd);
2235 break;
2236 default:
2237 isert_err("Unknown response state: 0x%02x\n", state);
2238 ret = -EINVAL;
2239 break;
2240 }
2241
2242 return ret;
2243 }
2244
2245 struct rdma_cm_id *
2246 isert_setup_id(struct isert_np *isert_np)
2247 {
2248 struct iscsi_np *np = isert_np->np;
2249 struct rdma_cm_id *id;
2250 struct sockaddr *sa;
2251 int ret;
2252
2253 sa = (struct sockaddr *)&np->np_sockaddr;
2254 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2255
2256 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2257 RDMA_PS_TCP, IB_QPT_RC);
2258 if (IS_ERR(id)) {
2259 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2260 ret = PTR_ERR(id);
2261 goto out;
2262 }
2263 isert_dbg("id %p context %p\n", id, id->context);
2264
2265 ret = rdma_bind_addr(id, sa);
2266 if (ret) {
2267 isert_err("rdma_bind_addr() failed: %d\n", ret);
2268 goto out_id;
2269 }
2270
2271 ret = rdma_listen(id, 0);
2272 if (ret) {
2273 isert_err("rdma_listen() failed: %d\n", ret);
2274 goto out_id;
2275 }
2276
2277 return id;
2278 out_id:
2279 rdma_destroy_id(id);
2280 out:
2281 return ERR_PTR(ret);
2282 }
2283
2284 static int
2285 isert_setup_np(struct iscsi_np *np,
2286 struct sockaddr_storage *ksockaddr)
2287 {
2288 struct isert_np *isert_np;
2289 struct rdma_cm_id *isert_lid;
2290 int ret;
2291
2292 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2293 if (!isert_np) {
2294 isert_err("Unable to allocate struct isert_np\n");
2295 return -ENOMEM;
2296 }
2297 sema_init(&isert_np->sem, 0);
2298 mutex_init(&isert_np->mutex);
2299 INIT_LIST_HEAD(&isert_np->accepted);
2300 INIT_LIST_HEAD(&isert_np->pending);
2301 isert_np->np = np;
2302
2303 /*
2304 * Setup the np->np_sockaddr from the passed sockaddr setup
2305 * in iscsi_target_configfs.c code..
2306 */
2307 memcpy(&np->np_sockaddr, ksockaddr,
2308 sizeof(struct sockaddr_storage));
2309
2310 isert_lid = isert_setup_id(isert_np);
2311 if (IS_ERR(isert_lid)) {
2312 ret = PTR_ERR(isert_lid);
2313 goto out;
2314 }
2315
2316 isert_np->cm_id = isert_lid;
2317 np->np_context = isert_np;
2318
2319 return 0;
2320
2321 out:
2322 kfree(isert_np);
2323
2324 return ret;
2325 }
2326
2327 static int
2328 isert_rdma_accept(struct isert_conn *isert_conn)
2329 {
2330 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2331 struct rdma_conn_param cp;
2332 int ret;
2333 struct iser_cm_hdr rsp_hdr;
2334
2335 memset(&cp, 0, sizeof(struct rdma_conn_param));
2336 cp.initiator_depth = isert_conn->initiator_depth;
2337 cp.retry_count = 7;
2338 cp.rnr_retry_count = 7;
2339
2340 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2341 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2342 if (!isert_conn->snd_w_inv)
2343 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2344 cp.private_data = (void *)&rsp_hdr;
2345 cp.private_data_len = sizeof(rsp_hdr);
2346
2347 ret = rdma_accept(cm_id, &cp);
2348 if (ret) {
2349 isert_err("rdma_accept() failed with: %d\n", ret);
2350 return ret;
2351 }
2352
2353 return 0;
2354 }
2355
2356 static int
2357 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2358 {
2359 struct isert_conn *isert_conn = conn->context;
2360 int ret;
2361
2362 isert_info("before login_req comp conn: %p\n", isert_conn);
2363 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2364 if (ret) {
2365 isert_err("isert_conn %p interrupted before got login req\n",
2366 isert_conn);
2367 return ret;
2368 }
2369 reinit_completion(&isert_conn->login_req_comp);
2370
2371 /*
2372 * For login requests after the first PDU, isert_rx_login_req() will
2373 * kick schedule_delayed_work(&conn->login_work) as the packet is
2374 * received, which turns this callback from iscsi_target_do_login_rx()
2375 * into a NOP.
2376 */
2377 if (!login->first_request)
2378 return 0;
2379
2380 isert_rx_login_req(isert_conn);
2381
2382 isert_info("before login_comp conn: %p\n", conn);
2383 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2384 if (ret)
2385 return ret;
2386
2387 isert_info("processing login->req: %p\n", login->req);
2388
2389 return 0;
2390 }
2391
2392 static void
2393 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2394 struct isert_conn *isert_conn)
2395 {
2396 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2397 struct rdma_route *cm_route = &cm_id->route;
2398
2399 conn->login_family = np->np_sockaddr.ss_family;
2400
2401 conn->login_sockaddr = cm_route->addr.dst_addr;
2402 conn->local_sockaddr = cm_route->addr.src_addr;
2403 }
2404
2405 static int
2406 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2407 {
2408 struct isert_np *isert_np = np->np_context;
2409 struct isert_conn *isert_conn;
2410 int ret;
2411
2412 accept_wait:
2413 ret = down_interruptible(&isert_np->sem);
2414 if (ret)
2415 return -ENODEV;
2416
2417 spin_lock_bh(&np->np_thread_lock);
2418 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2419 spin_unlock_bh(&np->np_thread_lock);
2420 isert_dbg("np_thread_state %d\n",
2421 np->np_thread_state);
2422 /**
2423 * No point in stalling here when np_thread
2424 * is in state RESET/SHUTDOWN/EXIT - bail
2425 **/
2426 return -ENODEV;
2427 }
2428 spin_unlock_bh(&np->np_thread_lock);
2429
2430 mutex_lock(&isert_np->mutex);
2431 if (list_empty(&isert_np->pending)) {
2432 mutex_unlock(&isert_np->mutex);
2433 goto accept_wait;
2434 }
2435 isert_conn = list_first_entry(&isert_np->pending,
2436 struct isert_conn, node);
2437 list_del_init(&isert_conn->node);
2438 mutex_unlock(&isert_np->mutex);
2439
2440 conn->context = isert_conn;
2441 isert_conn->conn = conn;
2442 isert_conn->state = ISER_CONN_BOUND;
2443
2444 isert_set_conn_info(np, conn, isert_conn);
2445
2446 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2447
2448 return 0;
2449 }
2450
2451 static void
2452 isert_free_np(struct iscsi_np *np)
2453 {
2454 struct isert_np *isert_np = np->np_context;
2455 struct isert_conn *isert_conn, *n;
2456
2457 if (isert_np->cm_id)
2458 rdma_destroy_id(isert_np->cm_id);
2459
2460 /*
2461 * FIXME: At this point we don't have a good way to insure
2462 * that at this point we don't have hanging connections that
2463 * completed RDMA establishment but didn't start iscsi login
2464 * process. So work-around this by cleaning up what ever piled
2465 * up in accepted and pending lists.
2466 */
2467 mutex_lock(&isert_np->mutex);
2468 if (!list_empty(&isert_np->pending)) {
2469 isert_info("Still have isert pending connections\n");
2470 list_for_each_entry_safe(isert_conn, n,
2471 &isert_np->pending,
2472 node) {
2473 isert_info("cleaning isert_conn %p state (%d)\n",
2474 isert_conn, isert_conn->state);
2475 isert_connect_release(isert_conn);
2476 }
2477 }
2478
2479 if (!list_empty(&isert_np->accepted)) {
2480 isert_info("Still have isert accepted connections\n");
2481 list_for_each_entry_safe(isert_conn, n,
2482 &isert_np->accepted,
2483 node) {
2484 isert_info("cleaning isert_conn %p state (%d)\n",
2485 isert_conn, isert_conn->state);
2486 isert_connect_release(isert_conn);
2487 }
2488 }
2489 mutex_unlock(&isert_np->mutex);
2490
2491 np->np_context = NULL;
2492 kfree(isert_np);
2493 }
2494
2495 static void isert_release_work(struct work_struct *work)
2496 {
2497 struct isert_conn *isert_conn = container_of(work,
2498 struct isert_conn,
2499 release_work);
2500
2501 isert_info("Starting release conn %p\n", isert_conn);
2502
2503 mutex_lock(&isert_conn->mutex);
2504 isert_conn->state = ISER_CONN_DOWN;
2505 mutex_unlock(&isert_conn->mutex);
2506
2507 isert_info("Destroying conn %p\n", isert_conn);
2508 isert_put_conn(isert_conn);
2509 }
2510
2511 static void
2512 isert_wait4logout(struct isert_conn *isert_conn)
2513 {
2514 struct iscsi_conn *conn = isert_conn->conn;
2515
2516 isert_info("conn %p\n", isert_conn);
2517
2518 if (isert_conn->logout_posted) {
2519 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2520 wait_for_completion_timeout(&conn->conn_logout_comp,
2521 SECONDS_FOR_LOGOUT_COMP * HZ);
2522 }
2523 }
2524
2525 static void
2526 isert_wait4cmds(struct iscsi_conn *conn)
2527 {
2528 isert_info("iscsi_conn %p\n", conn);
2529
2530 if (conn->sess) {
2531 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2532 target_wait_for_sess_cmds(conn->sess->se_sess);
2533 }
2534 }
2535
2536 /**
2537 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2538 * unsolicitate dataout
2539 * @conn: iscsi connection
2540 *
2541 * We might still have commands that are waiting for unsolicited
2542 * dataouts messages. We must put the extra reference on those
2543 * before blocking on the target_wait_for_session_cmds
2544 */
2545 static void
2546 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2547 {
2548 struct iscsi_cmd *cmd, *tmp;
2549 static LIST_HEAD(drop_cmd_list);
2550
2551 spin_lock_bh(&conn->cmd_lock);
2552 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2553 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2554 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2555 (cmd->write_data_done < cmd->se_cmd.data_length))
2556 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2557 }
2558 spin_unlock_bh(&conn->cmd_lock);
2559
2560 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2561 list_del_init(&cmd->i_conn_node);
2562 if (cmd->i_state != ISTATE_REMOVE) {
2563 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2564
2565 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2566 isert_put_cmd(isert_cmd, true);
2567 }
2568 }
2569 }
2570
2571 static void isert_wait_conn(struct iscsi_conn *conn)
2572 {
2573 struct isert_conn *isert_conn = conn->context;
2574
2575 isert_info("Starting conn %p\n", isert_conn);
2576
2577 mutex_lock(&isert_conn->mutex);
2578 isert_conn_terminate(isert_conn);
2579 mutex_unlock(&isert_conn->mutex);
2580
2581 ib_drain_qp(isert_conn->qp);
2582 isert_put_unsol_pending_cmds(conn);
2583 isert_wait4cmds(conn);
2584 isert_wait4logout(isert_conn);
2585
2586 queue_work(isert_release_wq, &isert_conn->release_work);
2587 }
2588
2589 static void isert_free_conn(struct iscsi_conn *conn)
2590 {
2591 struct isert_conn *isert_conn = conn->context;
2592
2593 ib_drain_qp(isert_conn->qp);
2594 isert_put_conn(isert_conn);
2595 }
2596
2597 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2598 {
2599 struct completion comp;
2600
2601 init_completion(&comp);
2602
2603 wait_for_completion_interruptible(&comp);
2604 }
2605
2606 static struct iscsit_transport iser_target_transport = {
2607 .name = "IB/iSER",
2608 .transport_type = ISCSI_INFINIBAND,
2609 .rdma_shutdown = true,
2610 .priv_size = sizeof(struct isert_cmd),
2611 .owner = THIS_MODULE,
2612 .iscsit_setup_np = isert_setup_np,
2613 .iscsit_accept_np = isert_accept_np,
2614 .iscsit_free_np = isert_free_np,
2615 .iscsit_wait_conn = isert_wait_conn,
2616 .iscsit_free_conn = isert_free_conn,
2617 .iscsit_get_login_rx = isert_get_login_rx,
2618 .iscsit_put_login_tx = isert_put_login_tx,
2619 .iscsit_immediate_queue = isert_immediate_queue,
2620 .iscsit_response_queue = isert_response_queue,
2621 .iscsit_get_dataout = isert_get_dataout,
2622 .iscsit_queue_data_in = isert_put_datain,
2623 .iscsit_queue_status = isert_put_response,
2624 .iscsit_aborted_task = isert_aborted_task,
2625 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2626 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2627 };
2628
2629 static int __init isert_init(void)
2630 {
2631 int ret;
2632
2633 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2634 WQ_UNBOUND | WQ_HIGHPRI, 0);
2635 if (!isert_comp_wq) {
2636 isert_err("Unable to allocate isert_comp_wq\n");
2637 ret = -ENOMEM;
2638 return -ENOMEM;
2639 }
2640
2641 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2642 WQ_UNBOUND_MAX_ACTIVE);
2643 if (!isert_release_wq) {
2644 isert_err("Unable to allocate isert_release_wq\n");
2645 ret = -ENOMEM;
2646 goto destroy_comp_wq;
2647 }
2648
2649 iscsit_register_transport(&iser_target_transport);
2650 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2651
2652 return 0;
2653
2654 destroy_comp_wq:
2655 destroy_workqueue(isert_comp_wq);
2656
2657 return ret;
2658 }
2659
2660 static void __exit isert_exit(void)
2661 {
2662 flush_scheduled_work();
2663 destroy_workqueue(isert_release_wq);
2664 destroy_workqueue(isert_comp_wq);
2665 iscsit_unregister_transport(&iser_target_transport);
2666 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2667 }
2668
2669 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2670 MODULE_VERSION("1.0");
2671 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2672 MODULE_LICENSE("GPL");
2673
2674 module_init(isert_init);
2675 module_exit(isert_exit);
Linux kernel - Deliverables
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