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spi-imx: Implements handling of the SPI_READY mode flag.
[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 }
821 rx_wr--;
822 rx_wr->next = NULL; /* mark end of work requests list */
823
824 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
825 &rx_wr_failed);
826 if (ret)
827 isert_err("ib_post_recv() failed with ret: %d\n", ret);
828
829 return ret;
830 }
831
832 static int
833 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
834 {
835 struct ib_recv_wr *rx_wr_failed, rx_wr;
836 int ret;
837
838 rx_wr.wr_cqe = &rx_desc->rx_cqe;
839 rx_wr.sg_list = &rx_desc->rx_sg;
840 rx_wr.num_sge = 1;
841 rx_wr.next = NULL;
842
843 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
844 if (ret)
845 isert_err("ib_post_recv() failed with ret: %d\n", ret);
846
847 return ret;
848 }
849
850 static int
851 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
852 {
853 struct ib_device *ib_dev = isert_conn->cm_id->device;
854 struct ib_send_wr send_wr, *send_wr_failed;
855 int ret;
856
857 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
858 ISER_HEADERS_LEN, DMA_TO_DEVICE);
859
860 tx_desc->tx_cqe.done = isert_login_send_done;
861
862 send_wr.next = NULL;
863 send_wr.wr_cqe = &tx_desc->tx_cqe;
864 send_wr.sg_list = tx_desc->tx_sg;
865 send_wr.num_sge = tx_desc->num_sge;
866 send_wr.opcode = IB_WR_SEND;
867 send_wr.send_flags = IB_SEND_SIGNALED;
868
869 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
870 if (ret)
871 isert_err("ib_post_send() failed, ret: %d\n", ret);
872
873 return ret;
874 }
875
876 static void
877 isert_create_send_desc(struct isert_conn *isert_conn,
878 struct isert_cmd *isert_cmd,
879 struct iser_tx_desc *tx_desc)
880 {
881 struct isert_device *device = isert_conn->device;
882 struct ib_device *ib_dev = device->ib_device;
883
884 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
885 ISER_HEADERS_LEN, DMA_TO_DEVICE);
886
887 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
888 tx_desc->iser_header.flags = ISCSI_CTRL;
889
890 tx_desc->num_sge = 1;
891
892 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
893 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
894 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
895 }
896 }
897
898 static int
899 isert_init_tx_hdrs(struct isert_conn *isert_conn,
900 struct iser_tx_desc *tx_desc)
901 {
902 struct isert_device *device = isert_conn->device;
903 struct ib_device *ib_dev = device->ib_device;
904 u64 dma_addr;
905
906 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
907 ISER_HEADERS_LEN, DMA_TO_DEVICE);
908 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
909 isert_err("ib_dma_mapping_error() failed\n");
910 return -ENOMEM;
911 }
912
913 tx_desc->dma_addr = dma_addr;
914 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
915 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
916 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
917
918 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
919 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
920 tx_desc->tx_sg[0].lkey);
921
922 return 0;
923 }
924
925 static void
926 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
927 struct ib_send_wr *send_wr)
928 {
929 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
930
931 tx_desc->tx_cqe.done = isert_send_done;
932 send_wr->wr_cqe = &tx_desc->tx_cqe;
933
934 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
935 send_wr->opcode = IB_WR_SEND_WITH_INV;
936 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
937 } else {
938 send_wr->opcode = IB_WR_SEND;
939 }
940
941 send_wr->sg_list = &tx_desc->tx_sg[0];
942 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
943 send_wr->send_flags = IB_SEND_SIGNALED;
944 }
945
946 static int
947 isert_login_post_recv(struct isert_conn *isert_conn)
948 {
949 struct ib_recv_wr rx_wr, *rx_wr_fail;
950 struct ib_sge sge;
951 int ret;
952
953 memset(&sge, 0, sizeof(struct ib_sge));
954 sge.addr = isert_conn->login_req_dma;
955 sge.length = ISER_RX_PAYLOAD_SIZE;
956 sge.lkey = isert_conn->device->pd->local_dma_lkey;
957
958 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
959 sge.addr, sge.length, sge.lkey);
960
961 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
962
963 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
964 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
965 rx_wr.sg_list = &sge;
966 rx_wr.num_sge = 1;
967
968 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
969 if (ret)
970 isert_err("ib_post_recv() failed: %d\n", ret);
971
972 return ret;
973 }
974
975 static int
976 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
977 u32 length)
978 {
979 struct isert_conn *isert_conn = conn->context;
980 struct isert_device *device = isert_conn->device;
981 struct ib_device *ib_dev = device->ib_device;
982 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
983 int ret;
984
985 isert_create_send_desc(isert_conn, NULL, tx_desc);
986
987 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
988 sizeof(struct iscsi_hdr));
989
990 isert_init_tx_hdrs(isert_conn, tx_desc);
991
992 if (length > 0) {
993 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
994
995 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
996 length, DMA_TO_DEVICE);
997
998 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
999
1000 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1001 length, DMA_TO_DEVICE);
1002
1003 tx_dsg->addr = isert_conn->login_rsp_dma;
1004 tx_dsg->length = length;
1005 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1006 tx_desc->num_sge = 2;
1007 }
1008 if (!login->login_failed) {
1009 if (login->login_complete) {
1010 ret = isert_alloc_rx_descriptors(isert_conn);
1011 if (ret)
1012 return ret;
1013
1014 ret = isert_post_recvm(isert_conn,
1015 ISERT_QP_MAX_RECV_DTOS);
1016 if (ret)
1017 return ret;
1018
1019 /* Now we are in FULL_FEATURE phase */
1020 mutex_lock(&isert_conn->mutex);
1021 isert_conn->state = ISER_CONN_FULL_FEATURE;
1022 mutex_unlock(&isert_conn->mutex);
1023 goto post_send;
1024 }
1025
1026 ret = isert_login_post_recv(isert_conn);
1027 if (ret)
1028 return ret;
1029 }
1030 post_send:
1031 ret = isert_login_post_send(isert_conn, tx_desc);
1032 if (ret)
1033 return ret;
1034
1035 return 0;
1036 }
1037
1038 static void
1039 isert_rx_login_req(struct isert_conn *isert_conn)
1040 {
1041 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1042 int rx_buflen = isert_conn->login_req_len;
1043 struct iscsi_conn *conn = isert_conn->conn;
1044 struct iscsi_login *login = conn->conn_login;
1045 int size;
1046
1047 isert_info("conn %p\n", isert_conn);
1048
1049 WARN_ON_ONCE(!login);
1050
1051 if (login->first_request) {
1052 struct iscsi_login_req *login_req =
1053 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1054 /*
1055 * Setup the initial iscsi_login values from the leading
1056 * login request PDU.
1057 */
1058 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1059 login->current_stage =
1060 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1061 >> 2;
1062 login->version_min = login_req->min_version;
1063 login->version_max = login_req->max_version;
1064 memcpy(login->isid, login_req->isid, 6);
1065 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1066 login->init_task_tag = login_req->itt;
1067 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1068 login->cid = be16_to_cpu(login_req->cid);
1069 login->tsih = be16_to_cpu(login_req->tsih);
1070 }
1071
1072 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1073
1074 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1075 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1076 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1077 MAX_KEY_VALUE_PAIRS);
1078 memcpy(login->req_buf, &rx_desc->data[0], size);
1079
1080 if (login->first_request) {
1081 complete(&isert_conn->login_comp);
1082 return;
1083 }
1084 schedule_delayed_work(&conn->login_work, 0);
1085 }
1086
1087 static struct iscsi_cmd
1088 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1089 {
1090 struct isert_conn *isert_conn = conn->context;
1091 struct isert_cmd *isert_cmd;
1092 struct iscsi_cmd *cmd;
1093
1094 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1095 if (!cmd) {
1096 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1097 return NULL;
1098 }
1099 isert_cmd = iscsit_priv_cmd(cmd);
1100 isert_cmd->conn = isert_conn;
1101 isert_cmd->iscsi_cmd = cmd;
1102 isert_cmd->rx_desc = rx_desc;
1103
1104 return cmd;
1105 }
1106
1107 static int
1108 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1109 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1110 struct iser_rx_desc *rx_desc, unsigned char *buf)
1111 {
1112 struct iscsi_conn *conn = isert_conn->conn;
1113 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1114 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1115 bool dump_payload = false;
1116 unsigned int data_len;
1117
1118 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1119 if (rc < 0)
1120 return rc;
1121
1122 imm_data = cmd->immediate_data;
1123 imm_data_len = cmd->first_burst_len;
1124 unsol_data = cmd->unsolicited_data;
1125 data_len = cmd->se_cmd.data_length;
1126
1127 if (imm_data && imm_data_len == data_len)
1128 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1129 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1130 if (rc < 0) {
1131 return 0;
1132 } else if (rc > 0) {
1133 dump_payload = true;
1134 goto sequence_cmd;
1135 }
1136
1137 if (!imm_data)
1138 return 0;
1139
1140 if (imm_data_len != data_len) {
1141 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1142 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1143 &rx_desc->data[0], imm_data_len);
1144 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1145 sg_nents, imm_data_len);
1146 } else {
1147 sg_init_table(&isert_cmd->sg, 1);
1148 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1149 cmd->se_cmd.t_data_nents = 1;
1150 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1151 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1152 imm_data_len);
1153 }
1154
1155 cmd->write_data_done += imm_data_len;
1156
1157 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1158 spin_lock_bh(&cmd->istate_lock);
1159 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1160 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1161 spin_unlock_bh(&cmd->istate_lock);
1162 }
1163
1164 sequence_cmd:
1165 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1166
1167 if (!rc && dump_payload == false && unsol_data)
1168 iscsit_set_unsoliticed_dataout(cmd);
1169 else if (dump_payload && imm_data)
1170 target_put_sess_cmd(&cmd->se_cmd);
1171
1172 return 0;
1173 }
1174
1175 static int
1176 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1177 struct iser_rx_desc *rx_desc, unsigned char *buf)
1178 {
1179 struct scatterlist *sg_start;
1180 struct iscsi_conn *conn = isert_conn->conn;
1181 struct iscsi_cmd *cmd = NULL;
1182 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1183 u32 unsol_data_len = ntoh24(hdr->dlength);
1184 int rc, sg_nents, sg_off, page_off;
1185
1186 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1187 if (rc < 0)
1188 return rc;
1189 else if (!cmd)
1190 return 0;
1191 /*
1192 * FIXME: Unexpected unsolicited_data out
1193 */
1194 if (!cmd->unsolicited_data) {
1195 isert_err("Received unexpected solicited data payload\n");
1196 dump_stack();
1197 return -1;
1198 }
1199
1200 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1201 "write_data_done: %u, data_length: %u\n",
1202 unsol_data_len, cmd->write_data_done,
1203 cmd->se_cmd.data_length);
1204
1205 sg_off = cmd->write_data_done / PAGE_SIZE;
1206 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1207 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1208 page_off = cmd->write_data_done % PAGE_SIZE;
1209 /*
1210 * FIXME: Non page-aligned unsolicited_data out
1211 */
1212 if (page_off) {
1213 isert_err("unexpected non-page aligned data payload\n");
1214 dump_stack();
1215 return -1;
1216 }
1217 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1218 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1219 sg_nents, &rx_desc->data[0], unsol_data_len);
1220
1221 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1222 unsol_data_len);
1223
1224 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1225 if (rc < 0)
1226 return rc;
1227
1228 /*
1229 * multiple data-outs on the same command can arrive -
1230 * so post the buffer before hand
1231 */
1232 rc = isert_post_recv(isert_conn, rx_desc);
1233 if (rc) {
1234 isert_err("ib_post_recv failed with %d\n", rc);
1235 return rc;
1236 }
1237 return 0;
1238 }
1239
1240 static int
1241 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1242 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1243 unsigned char *buf)
1244 {
1245 struct iscsi_conn *conn = isert_conn->conn;
1246 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1247 int rc;
1248
1249 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1250 if (rc < 0)
1251 return rc;
1252 /*
1253 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1254 */
1255
1256 return iscsit_process_nop_out(conn, cmd, hdr);
1257 }
1258
1259 static int
1260 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1261 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1262 struct iscsi_text *hdr)
1263 {
1264 struct iscsi_conn *conn = isert_conn->conn;
1265 u32 payload_length = ntoh24(hdr->dlength);
1266 int rc;
1267 unsigned char *text_in = NULL;
1268
1269 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1270 if (rc < 0)
1271 return rc;
1272
1273 if (payload_length) {
1274 text_in = kzalloc(payload_length, GFP_KERNEL);
1275 if (!text_in)
1276 return -ENOMEM;
1277 }
1278 cmd->text_in_ptr = text_in;
1279
1280 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1281
1282 return iscsit_process_text_cmd(conn, cmd, hdr);
1283 }
1284
1285 static int
1286 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1287 uint32_t read_stag, uint64_t read_va,
1288 uint32_t write_stag, uint64_t write_va)
1289 {
1290 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1291 struct iscsi_conn *conn = isert_conn->conn;
1292 struct iscsi_cmd *cmd;
1293 struct isert_cmd *isert_cmd;
1294 int ret = -EINVAL;
1295 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1296
1297 if (conn->sess->sess_ops->SessionType &&
1298 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1299 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1300 " ignoring\n", opcode);
1301 return 0;
1302 }
1303
1304 switch (opcode) {
1305 case ISCSI_OP_SCSI_CMD:
1306 cmd = isert_allocate_cmd(conn, rx_desc);
1307 if (!cmd)
1308 break;
1309
1310 isert_cmd = iscsit_priv_cmd(cmd);
1311 isert_cmd->read_stag = read_stag;
1312 isert_cmd->read_va = read_va;
1313 isert_cmd->write_stag = write_stag;
1314 isert_cmd->write_va = write_va;
1315 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1316
1317 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1318 rx_desc, (unsigned char *)hdr);
1319 break;
1320 case ISCSI_OP_NOOP_OUT:
1321 cmd = isert_allocate_cmd(conn, rx_desc);
1322 if (!cmd)
1323 break;
1324
1325 isert_cmd = iscsit_priv_cmd(cmd);
1326 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1327 rx_desc, (unsigned char *)hdr);
1328 break;
1329 case ISCSI_OP_SCSI_DATA_OUT:
1330 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1331 (unsigned char *)hdr);
1332 break;
1333 case ISCSI_OP_SCSI_TMFUNC:
1334 cmd = isert_allocate_cmd(conn, rx_desc);
1335 if (!cmd)
1336 break;
1337
1338 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1339 (unsigned char *)hdr);
1340 break;
1341 case ISCSI_OP_LOGOUT:
1342 cmd = isert_allocate_cmd(conn, rx_desc);
1343 if (!cmd)
1344 break;
1345
1346 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1347 break;
1348 case ISCSI_OP_TEXT:
1349 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1350 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1351 else
1352 cmd = isert_allocate_cmd(conn, rx_desc);
1353
1354 if (!cmd)
1355 break;
1356
1357 isert_cmd = iscsit_priv_cmd(cmd);
1358 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1359 rx_desc, (struct iscsi_text *)hdr);
1360 break;
1361 default:
1362 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1363 dump_stack();
1364 break;
1365 }
1366
1367 return ret;
1368 }
1369
1370 static void
1371 isert_print_wc(struct ib_wc *wc, const char *type)
1372 {
1373 if (wc->status != IB_WC_WR_FLUSH_ERR)
1374 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1375 ib_wc_status_msg(wc->status), wc->status,
1376 wc->vendor_err);
1377 else
1378 isert_dbg("%s failure: %s (%d)\n", type,
1379 ib_wc_status_msg(wc->status), wc->status);
1380 }
1381
1382 static void
1383 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1384 {
1385 struct isert_conn *isert_conn = wc->qp->qp_context;
1386 struct ib_device *ib_dev = isert_conn->cm_id->device;
1387 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1388 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1389 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1390 uint64_t read_va = 0, write_va = 0;
1391 uint32_t read_stag = 0, write_stag = 0;
1392
1393 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1394 isert_print_wc(wc, "recv");
1395 if (wc->status != IB_WC_WR_FLUSH_ERR)
1396 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1397 return;
1398 }
1399
1400 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1401 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1402
1403 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1404 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1405 (int)(wc->byte_len - ISER_HEADERS_LEN));
1406
1407 switch (iser_ctrl->flags & 0xF0) {
1408 case ISCSI_CTRL:
1409 if (iser_ctrl->flags & ISER_RSV) {
1410 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1411 read_va = be64_to_cpu(iser_ctrl->read_va);
1412 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1413 read_stag, (unsigned long long)read_va);
1414 }
1415 if (iser_ctrl->flags & ISER_WSV) {
1416 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1417 write_va = be64_to_cpu(iser_ctrl->write_va);
1418 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1419 write_stag, (unsigned long long)write_va);
1420 }
1421
1422 isert_dbg("ISER ISCSI_CTRL PDU\n");
1423 break;
1424 case ISER_HELLO:
1425 isert_err("iSER Hello message\n");
1426 break;
1427 default:
1428 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1429 break;
1430 }
1431
1432 isert_rx_opcode(isert_conn, rx_desc,
1433 read_stag, read_va, write_stag, write_va);
1434
1435 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1436 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1437 }
1438
1439 static void
1440 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1441 {
1442 struct isert_conn *isert_conn = wc->qp->qp_context;
1443 struct ib_device *ib_dev = isert_conn->cm_id->device;
1444
1445 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1446 isert_print_wc(wc, "login recv");
1447 return;
1448 }
1449
1450 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1451 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1452
1453 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1454
1455 if (isert_conn->conn) {
1456 struct iscsi_login *login = isert_conn->conn->conn_login;
1457
1458 if (login && !login->first_request)
1459 isert_rx_login_req(isert_conn);
1460 }
1461
1462 mutex_lock(&isert_conn->mutex);
1463 complete(&isert_conn->login_req_comp);
1464 mutex_unlock(&isert_conn->mutex);
1465
1466 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1467 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1468 }
1469
1470 static void
1471 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1472 {
1473 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1474 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1475
1476 if (!cmd->rw.nr_ops)
1477 return;
1478
1479 if (isert_prot_cmd(conn, se_cmd)) {
1480 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1481 conn->cm_id->port_num, se_cmd->t_data_sg,
1482 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1483 se_cmd->t_prot_nents, dir);
1484 } else {
1485 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1486 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1487 }
1488
1489 cmd->rw.nr_ops = 0;
1490 }
1491
1492 static void
1493 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1494 {
1495 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1496 struct isert_conn *isert_conn = isert_cmd->conn;
1497 struct iscsi_conn *conn = isert_conn->conn;
1498 struct iscsi_text_rsp *hdr;
1499
1500 isert_dbg("Cmd %p\n", isert_cmd);
1501
1502 switch (cmd->iscsi_opcode) {
1503 case ISCSI_OP_SCSI_CMD:
1504 spin_lock_bh(&conn->cmd_lock);
1505 if (!list_empty(&cmd->i_conn_node))
1506 list_del_init(&cmd->i_conn_node);
1507 spin_unlock_bh(&conn->cmd_lock);
1508
1509 if (cmd->data_direction == DMA_TO_DEVICE) {
1510 iscsit_stop_dataout_timer(cmd);
1511 /*
1512 * Check for special case during comp_err where
1513 * WRITE_PENDING has been handed off from core,
1514 * but requires an extra target_put_sess_cmd()
1515 * before transport_generic_free_cmd() below.
1516 */
1517 if (comp_err &&
1518 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1519 struct se_cmd *se_cmd = &cmd->se_cmd;
1520
1521 target_put_sess_cmd(se_cmd);
1522 }
1523 }
1524
1525 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1526 transport_generic_free_cmd(&cmd->se_cmd, 0);
1527 break;
1528 case ISCSI_OP_SCSI_TMFUNC:
1529 spin_lock_bh(&conn->cmd_lock);
1530 if (!list_empty(&cmd->i_conn_node))
1531 list_del_init(&cmd->i_conn_node);
1532 spin_unlock_bh(&conn->cmd_lock);
1533
1534 transport_generic_free_cmd(&cmd->se_cmd, 0);
1535 break;
1536 case ISCSI_OP_REJECT:
1537 case ISCSI_OP_NOOP_OUT:
1538 case ISCSI_OP_TEXT:
1539 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1540 /* If the continue bit is on, keep the command alive */
1541 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1542 break;
1543
1544 spin_lock_bh(&conn->cmd_lock);
1545 if (!list_empty(&cmd->i_conn_node))
1546 list_del_init(&cmd->i_conn_node);
1547 spin_unlock_bh(&conn->cmd_lock);
1548
1549 /*
1550 * Handle special case for REJECT when iscsi_add_reject*() has
1551 * overwritten the original iscsi_opcode assignment, and the
1552 * associated cmd->se_cmd needs to be released.
1553 */
1554 if (cmd->se_cmd.se_tfo != NULL) {
1555 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1556 cmd->iscsi_opcode);
1557 transport_generic_free_cmd(&cmd->se_cmd, 0);
1558 break;
1559 }
1560 /*
1561 * Fall-through
1562 */
1563 default:
1564 iscsit_release_cmd(cmd);
1565 break;
1566 }
1567 }
1568
1569 static void
1570 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1571 {
1572 if (tx_desc->dma_addr != 0) {
1573 isert_dbg("unmap single for tx_desc->dma_addr\n");
1574 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1575 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1576 tx_desc->dma_addr = 0;
1577 }
1578 }
1579
1580 static void
1581 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1582 struct ib_device *ib_dev, bool comp_err)
1583 {
1584 if (isert_cmd->pdu_buf_dma != 0) {
1585 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1586 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1587 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1588 isert_cmd->pdu_buf_dma = 0;
1589 }
1590
1591 isert_unmap_tx_desc(tx_desc, ib_dev);
1592 isert_put_cmd(isert_cmd, comp_err);
1593 }
1594
1595 static int
1596 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1597 {
1598 struct ib_mr_status mr_status;
1599 int ret;
1600
1601 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1602 if (ret) {
1603 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1604 goto fail_mr_status;
1605 }
1606
1607 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1608 u64 sec_offset_err;
1609 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1610
1611 switch (mr_status.sig_err.err_type) {
1612 case IB_SIG_BAD_GUARD:
1613 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1614 break;
1615 case IB_SIG_BAD_REFTAG:
1616 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1617 break;
1618 case IB_SIG_BAD_APPTAG:
1619 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1620 break;
1621 }
1622 sec_offset_err = mr_status.sig_err.sig_err_offset;
1623 do_div(sec_offset_err, block_size);
1624 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1625
1626 isert_err("PI error found type %d at sector 0x%llx "
1627 "expected 0x%x vs actual 0x%x\n",
1628 mr_status.sig_err.err_type,
1629 (unsigned long long)se_cmd->bad_sector,
1630 mr_status.sig_err.expected,
1631 mr_status.sig_err.actual);
1632 ret = 1;
1633 }
1634
1635 fail_mr_status:
1636 return ret;
1637 }
1638
1639 static void
1640 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1641 {
1642 struct isert_conn *isert_conn = wc->qp->qp_context;
1643 struct isert_device *device = isert_conn->device;
1644 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1645 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1646 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1647 int ret = 0;
1648
1649 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1650 isert_print_wc(wc, "rdma write");
1651 if (wc->status != IB_WC_WR_FLUSH_ERR)
1652 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1653 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1654 return;
1655 }
1656
1657 isert_dbg("Cmd %p\n", isert_cmd);
1658
1659 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1660 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1661
1662 if (ret)
1663 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1664 else
1665 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1666 }
1667
1668 static void
1669 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1670 {
1671 struct isert_conn *isert_conn = wc->qp->qp_context;
1672 struct isert_device *device = isert_conn->device;
1673 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1674 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1675 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1676 struct se_cmd *se_cmd = &cmd->se_cmd;
1677 int ret = 0;
1678
1679 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1680 isert_print_wc(wc, "rdma read");
1681 if (wc->status != IB_WC_WR_FLUSH_ERR)
1682 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1683 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1684 return;
1685 }
1686
1687 isert_dbg("Cmd %p\n", isert_cmd);
1688
1689 iscsit_stop_dataout_timer(cmd);
1690
1691 if (isert_prot_cmd(isert_conn, se_cmd))
1692 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1693 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1694 cmd->write_data_done = 0;
1695
1696 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1697 spin_lock_bh(&cmd->istate_lock);
1698 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1699 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1700 spin_unlock_bh(&cmd->istate_lock);
1701
1702 if (ret) {
1703 target_put_sess_cmd(se_cmd);
1704 transport_send_check_condition_and_sense(se_cmd,
1705 se_cmd->pi_err, 0);
1706 } else {
1707 target_execute_cmd(se_cmd);
1708 }
1709 }
1710
1711 static void
1712 isert_do_control_comp(struct work_struct *work)
1713 {
1714 struct isert_cmd *isert_cmd = container_of(work,
1715 struct isert_cmd, comp_work);
1716 struct isert_conn *isert_conn = isert_cmd->conn;
1717 struct ib_device *ib_dev = isert_conn->cm_id->device;
1718 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1719
1720 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1721
1722 switch (cmd->i_state) {
1723 case ISTATE_SEND_TASKMGTRSP:
1724 iscsit_tmr_post_handler(cmd, cmd->conn);
1725 case ISTATE_SEND_REJECT: /* FALLTHRU */
1726 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1727 cmd->i_state = ISTATE_SENT_STATUS;
1728 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1729 ib_dev, false);
1730 break;
1731 case ISTATE_SEND_LOGOUTRSP:
1732 iscsit_logout_post_handler(cmd, cmd->conn);
1733 break;
1734 default:
1735 isert_err("Unknown i_state %d\n", cmd->i_state);
1736 dump_stack();
1737 break;
1738 }
1739 }
1740
1741 static void
1742 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1743 {
1744 struct isert_conn *isert_conn = wc->qp->qp_context;
1745 struct ib_device *ib_dev = isert_conn->cm_id->device;
1746 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1747
1748 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1749 isert_print_wc(wc, "login send");
1750 if (wc->status != IB_WC_WR_FLUSH_ERR)
1751 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1752 }
1753
1754 isert_unmap_tx_desc(tx_desc, ib_dev);
1755 }
1756
1757 static void
1758 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1759 {
1760 struct isert_conn *isert_conn = wc->qp->qp_context;
1761 struct ib_device *ib_dev = isert_conn->cm_id->device;
1762 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1763 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1764
1765 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1766 isert_print_wc(wc, "send");
1767 if (wc->status != IB_WC_WR_FLUSH_ERR)
1768 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1769 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1770 return;
1771 }
1772
1773 isert_dbg("Cmd %p\n", isert_cmd);
1774
1775 switch (isert_cmd->iscsi_cmd->i_state) {
1776 case ISTATE_SEND_TASKMGTRSP:
1777 case ISTATE_SEND_LOGOUTRSP:
1778 case ISTATE_SEND_REJECT:
1779 case ISTATE_SEND_TEXTRSP:
1780 isert_unmap_tx_desc(tx_desc, ib_dev);
1781
1782 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1783 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1784 return;
1785 default:
1786 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1787 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1788 break;
1789 }
1790 }
1791
1792 static int
1793 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1794 {
1795 struct ib_send_wr *wr_failed;
1796 int ret;
1797
1798 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1799 if (ret) {
1800 isert_err("ib_post_recv failed with %d\n", ret);
1801 return ret;
1802 }
1803
1804 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1805 &wr_failed);
1806 if (ret) {
1807 isert_err("ib_post_send failed with %d\n", ret);
1808 return ret;
1809 }
1810 return ret;
1811 }
1812
1813 static int
1814 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1815 {
1816 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1817 struct isert_conn *isert_conn = conn->context;
1818 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1819 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1820 &isert_cmd->tx_desc.iscsi_header;
1821
1822 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1823 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1824 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1825 /*
1826 * Attach SENSE DATA payload to iSCSI Response PDU
1827 */
1828 if (cmd->se_cmd.sense_buffer &&
1829 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1830 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1831 struct isert_device *device = isert_conn->device;
1832 struct ib_device *ib_dev = device->ib_device;
1833 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1834 u32 padding, pdu_len;
1835
1836 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1837 cmd->sense_buffer);
1838 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1839
1840 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1841 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1842 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1843
1844 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1845 (void *)cmd->sense_buffer, pdu_len,
1846 DMA_TO_DEVICE);
1847 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1848 return -ENOMEM;
1849
1850 isert_cmd->pdu_buf_len = pdu_len;
1851 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1852 tx_dsg->length = pdu_len;
1853 tx_dsg->lkey = device->pd->local_dma_lkey;
1854 isert_cmd->tx_desc.num_sge = 2;
1855 }
1856
1857 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1858
1859 isert_dbg("Posting SCSI Response\n");
1860
1861 return isert_post_response(isert_conn, isert_cmd);
1862 }
1863
1864 static void
1865 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1866 {
1867 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1868 struct isert_conn *isert_conn = conn->context;
1869
1870 spin_lock_bh(&conn->cmd_lock);
1871 if (!list_empty(&cmd->i_conn_node))
1872 list_del_init(&cmd->i_conn_node);
1873 spin_unlock_bh(&conn->cmd_lock);
1874
1875 if (cmd->data_direction == DMA_TO_DEVICE)
1876 iscsit_stop_dataout_timer(cmd);
1877 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1878 }
1879
1880 static enum target_prot_op
1881 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1882 {
1883 struct isert_conn *isert_conn = conn->context;
1884 struct isert_device *device = isert_conn->device;
1885
1886 if (conn->tpg->tpg_attrib.t10_pi) {
1887 if (device->pi_capable) {
1888 isert_info("conn %p PI offload enabled\n", isert_conn);
1889 isert_conn->pi_support = true;
1890 return TARGET_PROT_ALL;
1891 }
1892 }
1893
1894 isert_info("conn %p PI offload disabled\n", isert_conn);
1895 isert_conn->pi_support = false;
1896
1897 return TARGET_PROT_NORMAL;
1898 }
1899
1900 static int
1901 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1902 bool nopout_response)
1903 {
1904 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1905 struct isert_conn *isert_conn = conn->context;
1906 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1907
1908 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1909 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1910 &isert_cmd->tx_desc.iscsi_header,
1911 nopout_response);
1912 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1913 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1914
1915 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1916
1917 return isert_post_response(isert_conn, isert_cmd);
1918 }
1919
1920 static int
1921 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1922 {
1923 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1924 struct isert_conn *isert_conn = conn->context;
1925 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1926
1927 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1928 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1929 &isert_cmd->tx_desc.iscsi_header);
1930 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1931 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1932
1933 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1934
1935 return isert_post_response(isert_conn, isert_cmd);
1936 }
1937
1938 static int
1939 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1940 {
1941 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1942 struct isert_conn *isert_conn = conn->context;
1943 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1944
1945 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1946 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1947 &isert_cmd->tx_desc.iscsi_header);
1948 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1949 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1950
1951 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1952
1953 return isert_post_response(isert_conn, isert_cmd);
1954 }
1955
1956 static int
1957 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1958 {
1959 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1960 struct isert_conn *isert_conn = conn->context;
1961 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1962 struct isert_device *device = isert_conn->device;
1963 struct ib_device *ib_dev = device->ib_device;
1964 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1965 struct iscsi_reject *hdr =
1966 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1967
1968 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1969 iscsit_build_reject(cmd, conn, hdr);
1970 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1971
1972 hton24(hdr->dlength, ISCSI_HDR_LEN);
1973 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1974 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1975 DMA_TO_DEVICE);
1976 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1977 return -ENOMEM;
1978 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1979 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1980 tx_dsg->length = ISCSI_HDR_LEN;
1981 tx_dsg->lkey = device->pd->local_dma_lkey;
1982 isert_cmd->tx_desc.num_sge = 2;
1983
1984 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1985
1986 isert_dbg("conn %p Posting Reject\n", isert_conn);
1987
1988 return isert_post_response(isert_conn, isert_cmd);
1989 }
1990
1991 static int
1992 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1993 {
1994 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1995 struct isert_conn *isert_conn = conn->context;
1996 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1997 struct iscsi_text_rsp *hdr =
1998 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1999 u32 txt_rsp_len;
2000 int rc;
2001
2002 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2003 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2004 if (rc < 0)
2005 return rc;
2006
2007 txt_rsp_len = rc;
2008 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2009
2010 if (txt_rsp_len) {
2011 struct isert_device *device = isert_conn->device;
2012 struct ib_device *ib_dev = device->ib_device;
2013 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2014 void *txt_rsp_buf = cmd->buf_ptr;
2015
2016 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2017 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2018 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2019 return -ENOMEM;
2020
2021 isert_cmd->pdu_buf_len = txt_rsp_len;
2022 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2023 tx_dsg->length = txt_rsp_len;
2024 tx_dsg->lkey = device->pd->local_dma_lkey;
2025 isert_cmd->tx_desc.num_sge = 2;
2026 }
2027 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2028
2029 isert_dbg("conn %p Text Response\n", isert_conn);
2030
2031 return isert_post_response(isert_conn, isert_cmd);
2032 }
2033
2034 static inline void
2035 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2036 struct ib_sig_domain *domain)
2037 {
2038 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2039 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2040 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2041 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2042 /*
2043 * At the moment we hard code those, but if in the future
2044 * the target core would like to use it, we will take it
2045 * from se_cmd.
2046 */
2047 domain->sig.dif.apptag_check_mask = 0xffff;
2048 domain->sig.dif.app_escape = true;
2049 domain->sig.dif.ref_escape = true;
2050 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2051 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2052 domain->sig.dif.ref_remap = true;
2053 };
2054
2055 static int
2056 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2057 {
2058 memset(sig_attrs, 0, sizeof(*sig_attrs));
2059
2060 switch (se_cmd->prot_op) {
2061 case TARGET_PROT_DIN_INSERT:
2062 case TARGET_PROT_DOUT_STRIP:
2063 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2064 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2065 break;
2066 case TARGET_PROT_DOUT_INSERT:
2067 case TARGET_PROT_DIN_STRIP:
2068 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2069 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2070 break;
2071 case TARGET_PROT_DIN_PASS:
2072 case TARGET_PROT_DOUT_PASS:
2073 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2074 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2075 break;
2076 default:
2077 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2078 return -EINVAL;
2079 }
2080
2081 sig_attrs->check_mask =
2082 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2083 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2084 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2085 return 0;
2086 }
2087
2088 static int
2089 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2090 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2091 {
2092 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2093 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2094 u8 port_num = conn->cm_id->port_num;
2095 u64 addr;
2096 u32 rkey, offset;
2097 int ret;
2098
2099 if (dir == DMA_FROM_DEVICE) {
2100 addr = cmd->write_va;
2101 rkey = cmd->write_stag;
2102 offset = cmd->iscsi_cmd->write_data_done;
2103 } else {
2104 addr = cmd->read_va;
2105 rkey = cmd->read_stag;
2106 offset = 0;
2107 }
2108
2109 if (isert_prot_cmd(conn, se_cmd)) {
2110 struct ib_sig_attrs sig_attrs;
2111
2112 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2113 if (ret)
2114 return ret;
2115
2116 WARN_ON_ONCE(offset);
2117 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2118 se_cmd->t_data_sg, se_cmd->t_data_nents,
2119 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2120 &sig_attrs, addr, rkey, dir);
2121 } else {
2122 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2123 se_cmd->t_data_sg, se_cmd->t_data_nents,
2124 offset, addr, rkey, dir);
2125 }
2126 if (ret < 0) {
2127 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2128 return ret;
2129 }
2130
2131 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2132 if (ret < 0)
2133 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2134 return ret;
2135 }
2136
2137 static int
2138 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2139 {
2140 struct se_cmd *se_cmd = &cmd->se_cmd;
2141 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2142 struct isert_conn *isert_conn = conn->context;
2143 struct ib_cqe *cqe = NULL;
2144 struct ib_send_wr *chain_wr = NULL;
2145 int rc;
2146
2147 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2148 isert_cmd, se_cmd->data_length);
2149
2150 if (isert_prot_cmd(isert_conn, se_cmd)) {
2151 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2152 cqe = &isert_cmd->tx_desc.tx_cqe;
2153 } else {
2154 /*
2155 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2156 */
2157 isert_create_send_desc(isert_conn, isert_cmd,
2158 &isert_cmd->tx_desc);
2159 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2160 &isert_cmd->tx_desc.iscsi_header);
2161 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2162 isert_init_send_wr(isert_conn, isert_cmd,
2163 &isert_cmd->tx_desc.send_wr);
2164
2165 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2166 if (rc) {
2167 isert_err("ib_post_recv failed with %d\n", rc);
2168 return rc;
2169 }
2170
2171 chain_wr = &isert_cmd->tx_desc.send_wr;
2172 }
2173
2174 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2175 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2176 return 1;
2177 }
2178
2179 static int
2180 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2181 {
2182 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2183
2184 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2185 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2186
2187 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2188 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2189 &isert_cmd->tx_desc.tx_cqe, NULL);
2190
2191 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2192 isert_cmd);
2193 return 0;
2194 }
2195
2196 static int
2197 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2198 {
2199 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2200 int ret = 0;
2201
2202 switch (state) {
2203 case ISTATE_REMOVE:
2204 spin_lock_bh(&conn->cmd_lock);
2205 list_del_init(&cmd->i_conn_node);
2206 spin_unlock_bh(&conn->cmd_lock);
2207 isert_put_cmd(isert_cmd, true);
2208 break;
2209 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2210 ret = isert_put_nopin(cmd, conn, false);
2211 break;
2212 default:
2213 isert_err("Unknown immediate state: 0x%02x\n", state);
2214 ret = -EINVAL;
2215 break;
2216 }
2217
2218 return ret;
2219 }
2220
2221 static int
2222 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2223 {
2224 struct isert_conn *isert_conn = conn->context;
2225 int ret;
2226
2227 switch (state) {
2228 case ISTATE_SEND_LOGOUTRSP:
2229 ret = isert_put_logout_rsp(cmd, conn);
2230 if (!ret)
2231 isert_conn->logout_posted = true;
2232 break;
2233 case ISTATE_SEND_NOPIN:
2234 ret = isert_put_nopin(cmd, conn, true);
2235 break;
2236 case ISTATE_SEND_TASKMGTRSP:
2237 ret = isert_put_tm_rsp(cmd, conn);
2238 break;
2239 case ISTATE_SEND_REJECT:
2240 ret = isert_put_reject(cmd, conn);
2241 break;
2242 case ISTATE_SEND_TEXTRSP:
2243 ret = isert_put_text_rsp(cmd, conn);
2244 break;
2245 case ISTATE_SEND_STATUS:
2246 /*
2247 * Special case for sending non GOOD SCSI status from TX thread
2248 * context during pre se_cmd excecution failure.
2249 */
2250 ret = isert_put_response(conn, cmd);
2251 break;
2252 default:
2253 isert_err("Unknown response state: 0x%02x\n", state);
2254 ret = -EINVAL;
2255 break;
2256 }
2257
2258 return ret;
2259 }
2260
2261 struct rdma_cm_id *
2262 isert_setup_id(struct isert_np *isert_np)
2263 {
2264 struct iscsi_np *np = isert_np->np;
2265 struct rdma_cm_id *id;
2266 struct sockaddr *sa;
2267 int ret;
2268
2269 sa = (struct sockaddr *)&np->np_sockaddr;
2270 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2271
2272 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2273 RDMA_PS_TCP, IB_QPT_RC);
2274 if (IS_ERR(id)) {
2275 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2276 ret = PTR_ERR(id);
2277 goto out;
2278 }
2279 isert_dbg("id %p context %p\n", id, id->context);
2280
2281 ret = rdma_bind_addr(id, sa);
2282 if (ret) {
2283 isert_err("rdma_bind_addr() failed: %d\n", ret);
2284 goto out_id;
2285 }
2286
2287 ret = rdma_listen(id, 0);
2288 if (ret) {
2289 isert_err("rdma_listen() failed: %d\n", ret);
2290 goto out_id;
2291 }
2292
2293 return id;
2294 out_id:
2295 rdma_destroy_id(id);
2296 out:
2297 return ERR_PTR(ret);
2298 }
2299
2300 static int
2301 isert_setup_np(struct iscsi_np *np,
2302 struct sockaddr_storage *ksockaddr)
2303 {
2304 struct isert_np *isert_np;
2305 struct rdma_cm_id *isert_lid;
2306 int ret;
2307
2308 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2309 if (!isert_np)
2310 return -ENOMEM;
2311
2312 sema_init(&isert_np->sem, 0);
2313 mutex_init(&isert_np->mutex);
2314 INIT_LIST_HEAD(&isert_np->accepted);
2315 INIT_LIST_HEAD(&isert_np->pending);
2316 isert_np->np = np;
2317
2318 /*
2319 * Setup the np->np_sockaddr from the passed sockaddr setup
2320 * in iscsi_target_configfs.c code..
2321 */
2322 memcpy(&np->np_sockaddr, ksockaddr,
2323 sizeof(struct sockaddr_storage));
2324
2325 isert_lid = isert_setup_id(isert_np);
2326 if (IS_ERR(isert_lid)) {
2327 ret = PTR_ERR(isert_lid);
2328 goto out;
2329 }
2330
2331 isert_np->cm_id = isert_lid;
2332 np->np_context = isert_np;
2333
2334 return 0;
2335
2336 out:
2337 kfree(isert_np);
2338
2339 return ret;
2340 }
2341
2342 static int
2343 isert_rdma_accept(struct isert_conn *isert_conn)
2344 {
2345 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2346 struct rdma_conn_param cp;
2347 int ret;
2348 struct iser_cm_hdr rsp_hdr;
2349
2350 memset(&cp, 0, sizeof(struct rdma_conn_param));
2351 cp.initiator_depth = isert_conn->initiator_depth;
2352 cp.retry_count = 7;
2353 cp.rnr_retry_count = 7;
2354
2355 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2356 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2357 if (!isert_conn->snd_w_inv)
2358 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2359 cp.private_data = (void *)&rsp_hdr;
2360 cp.private_data_len = sizeof(rsp_hdr);
2361
2362 ret = rdma_accept(cm_id, &cp);
2363 if (ret) {
2364 isert_err("rdma_accept() failed with: %d\n", ret);
2365 return ret;
2366 }
2367
2368 return 0;
2369 }
2370
2371 static int
2372 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2373 {
2374 struct isert_conn *isert_conn = conn->context;
2375 int ret;
2376
2377 isert_info("before login_req comp conn: %p\n", isert_conn);
2378 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2379 if (ret) {
2380 isert_err("isert_conn %p interrupted before got login req\n",
2381 isert_conn);
2382 return ret;
2383 }
2384 reinit_completion(&isert_conn->login_req_comp);
2385
2386 /*
2387 * For login requests after the first PDU, isert_rx_login_req() will
2388 * kick schedule_delayed_work(&conn->login_work) as the packet is
2389 * received, which turns this callback from iscsi_target_do_login_rx()
2390 * into a NOP.
2391 */
2392 if (!login->first_request)
2393 return 0;
2394
2395 isert_rx_login_req(isert_conn);
2396
2397 isert_info("before login_comp conn: %p\n", conn);
2398 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2399 if (ret)
2400 return ret;
2401
2402 isert_info("processing login->req: %p\n", login->req);
2403
2404 return 0;
2405 }
2406
2407 static void
2408 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2409 struct isert_conn *isert_conn)
2410 {
2411 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2412 struct rdma_route *cm_route = &cm_id->route;
2413
2414 conn->login_family = np->np_sockaddr.ss_family;
2415
2416 conn->login_sockaddr = cm_route->addr.dst_addr;
2417 conn->local_sockaddr = cm_route->addr.src_addr;
2418 }
2419
2420 static int
2421 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2422 {
2423 struct isert_np *isert_np = np->np_context;
2424 struct isert_conn *isert_conn;
2425 int ret;
2426
2427 accept_wait:
2428 ret = down_interruptible(&isert_np->sem);
2429 if (ret)
2430 return -ENODEV;
2431
2432 spin_lock_bh(&np->np_thread_lock);
2433 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2434 spin_unlock_bh(&np->np_thread_lock);
2435 isert_dbg("np_thread_state %d\n",
2436 np->np_thread_state);
2437 /**
2438 * No point in stalling here when np_thread
2439 * is in state RESET/SHUTDOWN/EXIT - bail
2440 **/
2441 return -ENODEV;
2442 }
2443 spin_unlock_bh(&np->np_thread_lock);
2444
2445 mutex_lock(&isert_np->mutex);
2446 if (list_empty(&isert_np->pending)) {
2447 mutex_unlock(&isert_np->mutex);
2448 goto accept_wait;
2449 }
2450 isert_conn = list_first_entry(&isert_np->pending,
2451 struct isert_conn, node);
2452 list_del_init(&isert_conn->node);
2453 mutex_unlock(&isert_np->mutex);
2454
2455 conn->context = isert_conn;
2456 isert_conn->conn = conn;
2457 isert_conn->state = ISER_CONN_BOUND;
2458
2459 isert_set_conn_info(np, conn, isert_conn);
2460
2461 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2462
2463 return 0;
2464 }
2465
2466 static void
2467 isert_free_np(struct iscsi_np *np)
2468 {
2469 struct isert_np *isert_np = np->np_context;
2470 struct isert_conn *isert_conn, *n;
2471
2472 if (isert_np->cm_id)
2473 rdma_destroy_id(isert_np->cm_id);
2474
2475 /*
2476 * FIXME: At this point we don't have a good way to insure
2477 * that at this point we don't have hanging connections that
2478 * completed RDMA establishment but didn't start iscsi login
2479 * process. So work-around this by cleaning up what ever piled
2480 * up in accepted and pending lists.
2481 */
2482 mutex_lock(&isert_np->mutex);
2483 if (!list_empty(&isert_np->pending)) {
2484 isert_info("Still have isert pending connections\n");
2485 list_for_each_entry_safe(isert_conn, n,
2486 &isert_np->pending,
2487 node) {
2488 isert_info("cleaning isert_conn %p state (%d)\n",
2489 isert_conn, isert_conn->state);
2490 isert_connect_release(isert_conn);
2491 }
2492 }
2493
2494 if (!list_empty(&isert_np->accepted)) {
2495 isert_info("Still have isert accepted connections\n");
2496 list_for_each_entry_safe(isert_conn, n,
2497 &isert_np->accepted,
2498 node) {
2499 isert_info("cleaning isert_conn %p state (%d)\n",
2500 isert_conn, isert_conn->state);
2501 isert_connect_release(isert_conn);
2502 }
2503 }
2504 mutex_unlock(&isert_np->mutex);
2505
2506 np->np_context = NULL;
2507 kfree(isert_np);
2508 }
2509
2510 static void isert_release_work(struct work_struct *work)
2511 {
2512 struct isert_conn *isert_conn = container_of(work,
2513 struct isert_conn,
2514 release_work);
2515
2516 isert_info("Starting release conn %p\n", isert_conn);
2517
2518 mutex_lock(&isert_conn->mutex);
2519 isert_conn->state = ISER_CONN_DOWN;
2520 mutex_unlock(&isert_conn->mutex);
2521
2522 isert_info("Destroying conn %p\n", isert_conn);
2523 isert_put_conn(isert_conn);
2524 }
2525
2526 static void
2527 isert_wait4logout(struct isert_conn *isert_conn)
2528 {
2529 struct iscsi_conn *conn = isert_conn->conn;
2530
2531 isert_info("conn %p\n", isert_conn);
2532
2533 if (isert_conn->logout_posted) {
2534 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2535 wait_for_completion_timeout(&conn->conn_logout_comp,
2536 SECONDS_FOR_LOGOUT_COMP * HZ);
2537 }
2538 }
2539
2540 static void
2541 isert_wait4cmds(struct iscsi_conn *conn)
2542 {
2543 isert_info("iscsi_conn %p\n", conn);
2544
2545 if (conn->sess) {
2546 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2547 target_wait_for_sess_cmds(conn->sess->se_sess);
2548 }
2549 }
2550
2551 /**
2552 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2553 * unsolicitate dataout
2554 * @conn: iscsi connection
2555 *
2556 * We might still have commands that are waiting for unsolicited
2557 * dataouts messages. We must put the extra reference on those
2558 * before blocking on the target_wait_for_session_cmds
2559 */
2560 static void
2561 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2562 {
2563 struct iscsi_cmd *cmd, *tmp;
2564 static LIST_HEAD(drop_cmd_list);
2565
2566 spin_lock_bh(&conn->cmd_lock);
2567 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2568 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2569 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2570 (cmd->write_data_done < cmd->se_cmd.data_length))
2571 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2572 }
2573 spin_unlock_bh(&conn->cmd_lock);
2574
2575 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2576 list_del_init(&cmd->i_conn_node);
2577 if (cmd->i_state != ISTATE_REMOVE) {
2578 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2579
2580 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2581 isert_put_cmd(isert_cmd, true);
2582 }
2583 }
2584 }
2585
2586 static void isert_wait_conn(struct iscsi_conn *conn)
2587 {
2588 struct isert_conn *isert_conn = conn->context;
2589
2590 isert_info("Starting conn %p\n", isert_conn);
2591
2592 mutex_lock(&isert_conn->mutex);
2593 isert_conn_terminate(isert_conn);
2594 mutex_unlock(&isert_conn->mutex);
2595
2596 ib_drain_qp(isert_conn->qp);
2597 isert_put_unsol_pending_cmds(conn);
2598 isert_wait4cmds(conn);
2599 isert_wait4logout(isert_conn);
2600
2601 queue_work(isert_release_wq, &isert_conn->release_work);
2602 }
2603
2604 static void isert_free_conn(struct iscsi_conn *conn)
2605 {
2606 struct isert_conn *isert_conn = conn->context;
2607
2608 ib_drain_qp(isert_conn->qp);
2609 isert_put_conn(isert_conn);
2610 }
2611
2612 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2613 {
2614 struct completion comp;
2615
2616 init_completion(&comp);
2617
2618 wait_for_completion_interruptible(&comp);
2619 }
2620
2621 static struct iscsit_transport iser_target_transport = {
2622 .name = "IB/iSER",
2623 .transport_type = ISCSI_INFINIBAND,
2624 .rdma_shutdown = true,
2625 .priv_size = sizeof(struct isert_cmd),
2626 .owner = THIS_MODULE,
2627 .iscsit_setup_np = isert_setup_np,
2628 .iscsit_accept_np = isert_accept_np,
2629 .iscsit_free_np = isert_free_np,
2630 .iscsit_wait_conn = isert_wait_conn,
2631 .iscsit_free_conn = isert_free_conn,
2632 .iscsit_get_login_rx = isert_get_login_rx,
2633 .iscsit_put_login_tx = isert_put_login_tx,
2634 .iscsit_immediate_queue = isert_immediate_queue,
2635 .iscsit_response_queue = isert_response_queue,
2636 .iscsit_get_dataout = isert_get_dataout,
2637 .iscsit_queue_data_in = isert_put_datain,
2638 .iscsit_queue_status = isert_put_response,
2639 .iscsit_aborted_task = isert_aborted_task,
2640 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2641 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2642 };
2643
2644 static int __init isert_init(void)
2645 {
2646 int ret;
2647
2648 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2649 WQ_UNBOUND | WQ_HIGHPRI, 0);
2650 if (!isert_comp_wq) {
2651 isert_err("Unable to allocate isert_comp_wq\n");
2652 return -ENOMEM;
2653 }
2654
2655 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2656 WQ_UNBOUND_MAX_ACTIVE);
2657 if (!isert_release_wq) {
2658 isert_err("Unable to allocate isert_release_wq\n");
2659 ret = -ENOMEM;
2660 goto destroy_comp_wq;
2661 }
2662
2663 iscsit_register_transport(&iser_target_transport);
2664 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2665
2666 return 0;
2667
2668 destroy_comp_wq:
2669 destroy_workqueue(isert_comp_wq);
2670
2671 return ret;
2672 }
2673
2674 static void __exit isert_exit(void)
2675 {
2676 flush_scheduled_work();
2677 destroy_workqueue(isert_release_wq);
2678 destroy_workqueue(isert_comp_wq);
2679 iscsit_unregister_transport(&iser_target_transport);
2680 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2681 }
2682
2683 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2684 MODULE_VERSION("1.0");
2685 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2686 MODULE_LICENSE("GPL");
2687
2688 module_init(isert_init);
2689 module_exit(isert_exit);
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