]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/infiniband/ulp/isert/ib_isert.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledford/rdma
[mirror_ubuntu-artful-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 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, 0);
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 init_waitqueue_head(&isert_conn->rem_wait);
407 kref_init(&isert_conn->kref);
408 mutex_init(&isert_conn->mutex);
409 INIT_WORK(&isert_conn->release_work, isert_release_work);
410 }
411
412 static void
413 isert_free_login_buf(struct isert_conn *isert_conn)
414 {
415 struct ib_device *ib_dev = isert_conn->device->ib_device;
416
417 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
418 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
419 kfree(isert_conn->login_rsp_buf);
420
421 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
422 ISER_RX_PAYLOAD_SIZE,
423 DMA_FROM_DEVICE);
424 kfree(isert_conn->login_req_buf);
425 }
426
427 static int
428 isert_alloc_login_buf(struct isert_conn *isert_conn,
429 struct ib_device *ib_dev)
430 {
431 int ret;
432
433 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
434 GFP_KERNEL);
435 if (!isert_conn->login_req_buf) {
436 isert_err("Unable to allocate isert_conn->login_buf\n");
437 return -ENOMEM;
438 }
439
440 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
441 isert_conn->login_req_buf,
442 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
443 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
444 if (ret) {
445 isert_err("login_req_dma mapping error: %d\n", ret);
446 isert_conn->login_req_dma = 0;
447 goto out_free_login_req_buf;
448 }
449
450 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
451 if (!isert_conn->login_rsp_buf) {
452 ret = -ENOMEM;
453 goto out_unmap_login_req_buf;
454 }
455
456 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
457 isert_conn->login_rsp_buf,
458 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
459 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
460 if (ret) {
461 isert_err("login_rsp_dma mapping error: %d\n", ret);
462 isert_conn->login_rsp_dma = 0;
463 goto out_free_login_rsp_buf;
464 }
465
466 return 0;
467
468 out_free_login_rsp_buf:
469 kfree(isert_conn->login_rsp_buf);
470 out_unmap_login_req_buf:
471 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
472 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
473 out_free_login_req_buf:
474 kfree(isert_conn->login_req_buf);
475 return ret;
476 }
477
478 static void
479 isert_set_nego_params(struct isert_conn *isert_conn,
480 struct rdma_conn_param *param)
481 {
482 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
483
484 /* Set max inflight RDMA READ requests */
485 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
486 attr->max_qp_init_rd_atom);
487 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
488
489 if (param->private_data) {
490 u8 flags = *(u8 *)param->private_data;
491
492 /*
493 * use remote invalidation if the both initiator
494 * and the HCA support it
495 */
496 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
497 (attr->device_cap_flags &
498 IB_DEVICE_MEM_MGT_EXTENSIONS);
499 if (isert_conn->snd_w_inv)
500 isert_info("Using remote invalidation\n");
501 }
502 }
503
504 static int
505 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
506 {
507 struct isert_np *isert_np = cma_id->context;
508 struct iscsi_np *np = isert_np->np;
509 struct isert_conn *isert_conn;
510 struct isert_device *device;
511 int ret = 0;
512
513 spin_lock_bh(&np->np_thread_lock);
514 if (!np->enabled) {
515 spin_unlock_bh(&np->np_thread_lock);
516 isert_dbg("iscsi_np is not enabled, reject connect request\n");
517 return rdma_reject(cma_id, NULL, 0);
518 }
519 spin_unlock_bh(&np->np_thread_lock);
520
521 isert_dbg("cma_id: %p, portal: %p\n",
522 cma_id, cma_id->context);
523
524 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
525 if (!isert_conn)
526 return -ENOMEM;
527
528 isert_init_conn(isert_conn);
529 isert_conn->cm_id = cma_id;
530
531 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
532 if (ret)
533 goto out;
534
535 device = isert_device_get(cma_id);
536 if (IS_ERR(device)) {
537 ret = PTR_ERR(device);
538 goto out_rsp_dma_map;
539 }
540 isert_conn->device = device;
541
542 isert_set_nego_params(isert_conn, &event->param.conn);
543
544 ret = isert_conn_setup_qp(isert_conn, cma_id);
545 if (ret)
546 goto out_conn_dev;
547
548 ret = isert_login_post_recv(isert_conn);
549 if (ret)
550 goto out_conn_dev;
551
552 ret = isert_rdma_accept(isert_conn);
553 if (ret)
554 goto out_conn_dev;
555
556 mutex_lock(&isert_np->mutex);
557 list_add_tail(&isert_conn->node, &isert_np->accepted);
558 mutex_unlock(&isert_np->mutex);
559
560 return 0;
561
562 out_conn_dev:
563 isert_device_put(device);
564 out_rsp_dma_map:
565 isert_free_login_buf(isert_conn);
566 out:
567 kfree(isert_conn);
568 rdma_reject(cma_id, NULL, 0);
569 return ret;
570 }
571
572 static void
573 isert_connect_release(struct isert_conn *isert_conn)
574 {
575 struct isert_device *device = isert_conn->device;
576
577 isert_dbg("conn %p\n", isert_conn);
578
579 BUG_ON(!device);
580
581 isert_free_rx_descriptors(isert_conn);
582 if (isert_conn->cm_id &&
583 !isert_conn->dev_removed)
584 rdma_destroy_id(isert_conn->cm_id);
585
586 if (isert_conn->qp) {
587 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
588
589 isert_comp_put(comp);
590 ib_destroy_qp(isert_conn->qp);
591 }
592
593 if (isert_conn->login_req_buf)
594 isert_free_login_buf(isert_conn);
595
596 isert_device_put(device);
597
598 if (isert_conn->dev_removed)
599 wake_up_interruptible(&isert_conn->rem_wait);
600 else
601 kfree(isert_conn);
602 }
603
604 static void
605 isert_connected_handler(struct rdma_cm_id *cma_id)
606 {
607 struct isert_conn *isert_conn = cma_id->qp->qp_context;
608 struct isert_np *isert_np = cma_id->context;
609
610 isert_info("conn %p\n", isert_conn);
611
612 mutex_lock(&isert_conn->mutex);
613 isert_conn->state = ISER_CONN_UP;
614 kref_get(&isert_conn->kref);
615 mutex_unlock(&isert_conn->mutex);
616
617 mutex_lock(&isert_np->mutex);
618 list_move_tail(&isert_conn->node, &isert_np->pending);
619 mutex_unlock(&isert_np->mutex);
620
621 isert_info("np %p: Allow accept_np to continue\n", isert_np);
622 up(&isert_np->sem);
623 }
624
625 static void
626 isert_release_kref(struct kref *kref)
627 {
628 struct isert_conn *isert_conn = container_of(kref,
629 struct isert_conn, kref);
630
631 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
632 current->pid);
633
634 isert_connect_release(isert_conn);
635 }
636
637 static void
638 isert_put_conn(struct isert_conn *isert_conn)
639 {
640 kref_put(&isert_conn->kref, isert_release_kref);
641 }
642
643 static void
644 isert_handle_unbound_conn(struct isert_conn *isert_conn)
645 {
646 struct isert_np *isert_np = isert_conn->cm_id->context;
647
648 mutex_lock(&isert_np->mutex);
649 if (!list_empty(&isert_conn->node)) {
650 /*
651 * This means iscsi doesn't know this connection
652 * so schedule a cleanup ourselves
653 */
654 list_del_init(&isert_conn->node);
655 isert_put_conn(isert_conn);
656 queue_work(isert_release_wq, &isert_conn->release_work);
657 }
658 mutex_unlock(&isert_np->mutex);
659 }
660
661 /**
662 * isert_conn_terminate() - Initiate connection termination
663 * @isert_conn: isert connection struct
664 *
665 * Notes:
666 * In case the connection state is BOUND, move state
667 * to TEMINATING and start teardown sequence (rdma_disconnect).
668 * In case the connection state is UP, complete flush as well.
669 *
670 * This routine must be called with mutex held. Thus it is
671 * safe to call multiple times.
672 */
673 static void
674 isert_conn_terminate(struct isert_conn *isert_conn)
675 {
676 int err;
677
678 if (isert_conn->state >= ISER_CONN_TERMINATING)
679 return;
680
681 isert_info("Terminating conn %p state %d\n",
682 isert_conn, isert_conn->state);
683 isert_conn->state = ISER_CONN_TERMINATING;
684 err = rdma_disconnect(isert_conn->cm_id);
685 if (err)
686 isert_warn("Failed rdma_disconnect isert_conn %p\n",
687 isert_conn);
688 }
689
690 static int
691 isert_np_cma_handler(struct isert_np *isert_np,
692 enum rdma_cm_event_type event)
693 {
694 isert_dbg("%s (%d): isert np %p\n",
695 rdma_event_msg(event), event, isert_np);
696
697 switch (event) {
698 case RDMA_CM_EVENT_DEVICE_REMOVAL:
699 isert_np->cm_id = NULL;
700 break;
701 case RDMA_CM_EVENT_ADDR_CHANGE:
702 isert_np->cm_id = isert_setup_id(isert_np);
703 if (IS_ERR(isert_np->cm_id)) {
704 isert_err("isert np %p setup id failed: %ld\n",
705 isert_np, PTR_ERR(isert_np->cm_id));
706 isert_np->cm_id = NULL;
707 }
708 break;
709 default:
710 isert_err("isert np %p Unexpected event %d\n",
711 isert_np, event);
712 }
713
714 return -1;
715 }
716
717 static int
718 isert_disconnected_handler(struct rdma_cm_id *cma_id,
719 enum rdma_cm_event_type event)
720 {
721 struct isert_conn *isert_conn = cma_id->qp->qp_context;
722
723 mutex_lock(&isert_conn->mutex);
724 switch (isert_conn->state) {
725 case ISER_CONN_TERMINATING:
726 break;
727 case ISER_CONN_UP:
728 isert_conn_terminate(isert_conn);
729 ib_drain_qp(isert_conn->qp);
730 isert_handle_unbound_conn(isert_conn);
731 break;
732 case ISER_CONN_BOUND:
733 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
734 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
735 break;
736 default:
737 isert_warn("conn %p teminating in state %d\n",
738 isert_conn, isert_conn->state);
739 }
740 mutex_unlock(&isert_conn->mutex);
741
742 return 0;
743 }
744
745 static int
746 isert_connect_error(struct rdma_cm_id *cma_id)
747 {
748 struct isert_conn *isert_conn = cma_id->qp->qp_context;
749
750 list_del_init(&isert_conn->node);
751 isert_conn->cm_id = NULL;
752 isert_put_conn(isert_conn);
753
754 return -1;
755 }
756
757 static int
758 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
759 {
760 struct isert_np *isert_np = cma_id->context;
761 struct isert_conn *isert_conn;
762 int ret = 0;
763
764 isert_info("%s (%d): status %d id %p np %p\n",
765 rdma_event_msg(event->event), event->event,
766 event->status, cma_id, cma_id->context);
767
768 if (isert_np->cm_id == cma_id)
769 return isert_np_cma_handler(cma_id->context, event->event);
770
771 switch (event->event) {
772 case RDMA_CM_EVENT_CONNECT_REQUEST:
773 ret = isert_connect_request(cma_id, event);
774 if (ret)
775 isert_err("failed handle connect request %d\n", ret);
776 break;
777 case RDMA_CM_EVENT_ESTABLISHED:
778 isert_connected_handler(cma_id);
779 break;
780 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
781 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
782 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
783 ret = isert_disconnected_handler(cma_id, event->event);
784 break;
785 case RDMA_CM_EVENT_DEVICE_REMOVAL:
786 isert_conn = cma_id->qp->qp_context;
787 isert_conn->dev_removed = true;
788 isert_disconnected_handler(cma_id, event->event);
789 wait_event_interruptible(isert_conn->rem_wait,
790 isert_conn->state == ISER_CONN_DOWN);
791 kfree(isert_conn);
792 /*
793 * return non-zero from the callback to destroy
794 * the rdma cm id
795 */
796 return 1;
797 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
798 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
799 case RDMA_CM_EVENT_CONNECT_ERROR:
800 ret = isert_connect_error(cma_id);
801 break;
802 default:
803 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
804 break;
805 }
806
807 return ret;
808 }
809
810 static int
811 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
812 {
813 struct ib_recv_wr *rx_wr, *rx_wr_failed;
814 int i, ret;
815 struct iser_rx_desc *rx_desc;
816
817 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
818 rx_desc = &isert_conn->rx_descs[i];
819
820 rx_wr->wr_cqe = &rx_desc->rx_cqe;
821 rx_wr->sg_list = &rx_desc->rx_sg;
822 rx_wr->num_sge = 1;
823 rx_wr->next = rx_wr + 1;
824 }
825 rx_wr--;
826 rx_wr->next = NULL; /* mark end of work requests list */
827
828 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
829 &rx_wr_failed);
830 if (ret)
831 isert_err("ib_post_recv() failed with ret: %d\n", ret);
832
833 return ret;
834 }
835
836 static int
837 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
838 {
839 struct ib_recv_wr *rx_wr_failed, rx_wr;
840 int ret;
841
842 rx_wr.wr_cqe = &rx_desc->rx_cqe;
843 rx_wr.sg_list = &rx_desc->rx_sg;
844 rx_wr.num_sge = 1;
845 rx_wr.next = NULL;
846
847 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
848 if (ret)
849 isert_err("ib_post_recv() failed with ret: %d\n", ret);
850
851 return ret;
852 }
853
854 static int
855 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
856 {
857 struct ib_device *ib_dev = isert_conn->cm_id->device;
858 struct ib_send_wr send_wr, *send_wr_failed;
859 int ret;
860
861 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
862 ISER_HEADERS_LEN, DMA_TO_DEVICE);
863
864 tx_desc->tx_cqe.done = isert_login_send_done;
865
866 send_wr.next = NULL;
867 send_wr.wr_cqe = &tx_desc->tx_cqe;
868 send_wr.sg_list = tx_desc->tx_sg;
869 send_wr.num_sge = tx_desc->num_sge;
870 send_wr.opcode = IB_WR_SEND;
871 send_wr.send_flags = IB_SEND_SIGNALED;
872
873 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
874 if (ret)
875 isert_err("ib_post_send() failed, ret: %d\n", ret);
876
877 return ret;
878 }
879
880 static void
881 isert_create_send_desc(struct isert_conn *isert_conn,
882 struct isert_cmd *isert_cmd,
883 struct iser_tx_desc *tx_desc)
884 {
885 struct isert_device *device = isert_conn->device;
886 struct ib_device *ib_dev = device->ib_device;
887
888 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
889 ISER_HEADERS_LEN, DMA_TO_DEVICE);
890
891 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
892 tx_desc->iser_header.flags = ISCSI_CTRL;
893
894 tx_desc->num_sge = 1;
895
896 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
897 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
898 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
899 }
900 }
901
902 static int
903 isert_init_tx_hdrs(struct isert_conn *isert_conn,
904 struct iser_tx_desc *tx_desc)
905 {
906 struct isert_device *device = isert_conn->device;
907 struct ib_device *ib_dev = device->ib_device;
908 u64 dma_addr;
909
910 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
911 ISER_HEADERS_LEN, DMA_TO_DEVICE);
912 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
913 isert_err("ib_dma_mapping_error() failed\n");
914 return -ENOMEM;
915 }
916
917 tx_desc->dma_addr = dma_addr;
918 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
919 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
920 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
921
922 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
923 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
924 tx_desc->tx_sg[0].lkey);
925
926 return 0;
927 }
928
929 static void
930 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
931 struct ib_send_wr *send_wr)
932 {
933 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
934
935 tx_desc->tx_cqe.done = isert_send_done;
936 send_wr->wr_cqe = &tx_desc->tx_cqe;
937
938 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
939 send_wr->opcode = IB_WR_SEND_WITH_INV;
940 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
941 } else {
942 send_wr->opcode = IB_WR_SEND;
943 }
944
945 send_wr->sg_list = &tx_desc->tx_sg[0];
946 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
947 send_wr->send_flags = IB_SEND_SIGNALED;
948 }
949
950 static int
951 isert_login_post_recv(struct isert_conn *isert_conn)
952 {
953 struct ib_recv_wr rx_wr, *rx_wr_fail;
954 struct ib_sge sge;
955 int ret;
956
957 memset(&sge, 0, sizeof(struct ib_sge));
958 sge.addr = isert_conn->login_req_dma;
959 sge.length = ISER_RX_PAYLOAD_SIZE;
960 sge.lkey = isert_conn->device->pd->local_dma_lkey;
961
962 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
963 sge.addr, sge.length, sge.lkey);
964
965 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
966
967 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
968 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
969 rx_wr.sg_list = &sge;
970 rx_wr.num_sge = 1;
971
972 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
973 if (ret)
974 isert_err("ib_post_recv() failed: %d\n", ret);
975
976 return ret;
977 }
978
979 static int
980 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
981 u32 length)
982 {
983 struct isert_conn *isert_conn = conn->context;
984 struct isert_device *device = isert_conn->device;
985 struct ib_device *ib_dev = device->ib_device;
986 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
987 int ret;
988
989 isert_create_send_desc(isert_conn, NULL, tx_desc);
990
991 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
992 sizeof(struct iscsi_hdr));
993
994 isert_init_tx_hdrs(isert_conn, tx_desc);
995
996 if (length > 0) {
997 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
998
999 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1000 length, DMA_TO_DEVICE);
1001
1002 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1003
1004 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1005 length, DMA_TO_DEVICE);
1006
1007 tx_dsg->addr = isert_conn->login_rsp_dma;
1008 tx_dsg->length = length;
1009 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1010 tx_desc->num_sge = 2;
1011 }
1012 if (!login->login_failed) {
1013 if (login->login_complete) {
1014 ret = isert_alloc_rx_descriptors(isert_conn);
1015 if (ret)
1016 return ret;
1017
1018 ret = isert_post_recvm(isert_conn,
1019 ISERT_QP_MAX_RECV_DTOS);
1020 if (ret)
1021 return ret;
1022
1023 /* Now we are in FULL_FEATURE phase */
1024 mutex_lock(&isert_conn->mutex);
1025 isert_conn->state = ISER_CONN_FULL_FEATURE;
1026 mutex_unlock(&isert_conn->mutex);
1027 goto post_send;
1028 }
1029
1030 ret = isert_login_post_recv(isert_conn);
1031 if (ret)
1032 return ret;
1033 }
1034 post_send:
1035 ret = isert_login_post_send(isert_conn, tx_desc);
1036 if (ret)
1037 return ret;
1038
1039 return 0;
1040 }
1041
1042 static void
1043 isert_rx_login_req(struct isert_conn *isert_conn)
1044 {
1045 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1046 int rx_buflen = isert_conn->login_req_len;
1047 struct iscsi_conn *conn = isert_conn->conn;
1048 struct iscsi_login *login = conn->conn_login;
1049 int size;
1050
1051 isert_info("conn %p\n", isert_conn);
1052
1053 WARN_ON_ONCE(!login);
1054
1055 if (login->first_request) {
1056 struct iscsi_login_req *login_req =
1057 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1058 /*
1059 * Setup the initial iscsi_login values from the leading
1060 * login request PDU.
1061 */
1062 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1063 login->current_stage =
1064 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1065 >> 2;
1066 login->version_min = login_req->min_version;
1067 login->version_max = login_req->max_version;
1068 memcpy(login->isid, login_req->isid, 6);
1069 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1070 login->init_task_tag = login_req->itt;
1071 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1072 login->cid = be16_to_cpu(login_req->cid);
1073 login->tsih = be16_to_cpu(login_req->tsih);
1074 }
1075
1076 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1077
1078 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1079 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1080 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1081 MAX_KEY_VALUE_PAIRS);
1082 memcpy(login->req_buf, &rx_desc->data[0], size);
1083
1084 if (login->first_request) {
1085 complete(&isert_conn->login_comp);
1086 return;
1087 }
1088 schedule_delayed_work(&conn->login_work, 0);
1089 }
1090
1091 static struct iscsi_cmd
1092 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1093 {
1094 struct isert_conn *isert_conn = conn->context;
1095 struct isert_cmd *isert_cmd;
1096 struct iscsi_cmd *cmd;
1097
1098 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1099 if (!cmd) {
1100 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1101 return NULL;
1102 }
1103 isert_cmd = iscsit_priv_cmd(cmd);
1104 isert_cmd->conn = isert_conn;
1105 isert_cmd->iscsi_cmd = cmd;
1106 isert_cmd->rx_desc = rx_desc;
1107
1108 return cmd;
1109 }
1110
1111 static int
1112 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1113 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1114 struct iser_rx_desc *rx_desc, unsigned char *buf)
1115 {
1116 struct iscsi_conn *conn = isert_conn->conn;
1117 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1118 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1119 bool dump_payload = false;
1120 unsigned int data_len;
1121
1122 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1123 if (rc < 0)
1124 return rc;
1125
1126 imm_data = cmd->immediate_data;
1127 imm_data_len = cmd->first_burst_len;
1128 unsol_data = cmd->unsolicited_data;
1129 data_len = cmd->se_cmd.data_length;
1130
1131 if (imm_data && imm_data_len == data_len)
1132 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1133 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1134 if (rc < 0) {
1135 return 0;
1136 } else if (rc > 0) {
1137 dump_payload = true;
1138 goto sequence_cmd;
1139 }
1140
1141 if (!imm_data)
1142 return 0;
1143
1144 if (imm_data_len != data_len) {
1145 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1146 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1147 &rx_desc->data[0], imm_data_len);
1148 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1149 sg_nents, imm_data_len);
1150 } else {
1151 sg_init_table(&isert_cmd->sg, 1);
1152 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1153 cmd->se_cmd.t_data_nents = 1;
1154 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1155 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1156 imm_data_len);
1157 }
1158
1159 cmd->write_data_done += imm_data_len;
1160
1161 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1162 spin_lock_bh(&cmd->istate_lock);
1163 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1164 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1165 spin_unlock_bh(&cmd->istate_lock);
1166 }
1167
1168 sequence_cmd:
1169 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1170
1171 if (!rc && dump_payload == false && unsol_data)
1172 iscsit_set_unsoliticed_dataout(cmd);
1173 else if (dump_payload && imm_data)
1174 target_put_sess_cmd(&cmd->se_cmd);
1175
1176 return 0;
1177 }
1178
1179 static int
1180 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1181 struct iser_rx_desc *rx_desc, unsigned char *buf)
1182 {
1183 struct scatterlist *sg_start;
1184 struct iscsi_conn *conn = isert_conn->conn;
1185 struct iscsi_cmd *cmd = NULL;
1186 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1187 u32 unsol_data_len = ntoh24(hdr->dlength);
1188 int rc, sg_nents, sg_off, page_off;
1189
1190 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1191 if (rc < 0)
1192 return rc;
1193 else if (!cmd)
1194 return 0;
1195 /*
1196 * FIXME: Unexpected unsolicited_data out
1197 */
1198 if (!cmd->unsolicited_data) {
1199 isert_err("Received unexpected solicited data payload\n");
1200 dump_stack();
1201 return -1;
1202 }
1203
1204 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1205 "write_data_done: %u, data_length: %u\n",
1206 unsol_data_len, cmd->write_data_done,
1207 cmd->se_cmd.data_length);
1208
1209 sg_off = cmd->write_data_done / PAGE_SIZE;
1210 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1211 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1212 page_off = cmd->write_data_done % PAGE_SIZE;
1213 /*
1214 * FIXME: Non page-aligned unsolicited_data out
1215 */
1216 if (page_off) {
1217 isert_err("unexpected non-page aligned data payload\n");
1218 dump_stack();
1219 return -1;
1220 }
1221 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1222 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1223 sg_nents, &rx_desc->data[0], unsol_data_len);
1224
1225 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1226 unsol_data_len);
1227
1228 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1229 if (rc < 0)
1230 return rc;
1231
1232 /*
1233 * multiple data-outs on the same command can arrive -
1234 * so post the buffer before hand
1235 */
1236 rc = isert_post_recv(isert_conn, rx_desc);
1237 if (rc) {
1238 isert_err("ib_post_recv failed with %d\n", rc);
1239 return rc;
1240 }
1241 return 0;
1242 }
1243
1244 static int
1245 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1246 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1247 unsigned char *buf)
1248 {
1249 struct iscsi_conn *conn = isert_conn->conn;
1250 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1251 int rc;
1252
1253 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1254 if (rc < 0)
1255 return rc;
1256 /*
1257 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1258 */
1259
1260 return iscsit_process_nop_out(conn, cmd, hdr);
1261 }
1262
1263 static int
1264 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1265 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1266 struct iscsi_text *hdr)
1267 {
1268 struct iscsi_conn *conn = isert_conn->conn;
1269 u32 payload_length = ntoh24(hdr->dlength);
1270 int rc;
1271 unsigned char *text_in = NULL;
1272
1273 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1274 if (rc < 0)
1275 return rc;
1276
1277 if (payload_length) {
1278 text_in = kzalloc(payload_length, GFP_KERNEL);
1279 if (!text_in) {
1280 isert_err("Unable to allocate text_in of payload_length: %u\n",
1281 payload_length);
1282 return -ENOMEM;
1283 }
1284 }
1285 cmd->text_in_ptr = text_in;
1286
1287 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1288
1289 return iscsit_process_text_cmd(conn, cmd, hdr);
1290 }
1291
1292 static int
1293 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1294 uint32_t read_stag, uint64_t read_va,
1295 uint32_t write_stag, uint64_t write_va)
1296 {
1297 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1298 struct iscsi_conn *conn = isert_conn->conn;
1299 struct iscsi_cmd *cmd;
1300 struct isert_cmd *isert_cmd;
1301 int ret = -EINVAL;
1302 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1303
1304 if (conn->sess->sess_ops->SessionType &&
1305 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1306 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1307 " ignoring\n", opcode);
1308 return 0;
1309 }
1310
1311 switch (opcode) {
1312 case ISCSI_OP_SCSI_CMD:
1313 cmd = isert_allocate_cmd(conn, rx_desc);
1314 if (!cmd)
1315 break;
1316
1317 isert_cmd = iscsit_priv_cmd(cmd);
1318 isert_cmd->read_stag = read_stag;
1319 isert_cmd->read_va = read_va;
1320 isert_cmd->write_stag = write_stag;
1321 isert_cmd->write_va = write_va;
1322 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1323
1324 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1325 rx_desc, (unsigned char *)hdr);
1326 break;
1327 case ISCSI_OP_NOOP_OUT:
1328 cmd = isert_allocate_cmd(conn, rx_desc);
1329 if (!cmd)
1330 break;
1331
1332 isert_cmd = iscsit_priv_cmd(cmd);
1333 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1334 rx_desc, (unsigned char *)hdr);
1335 break;
1336 case ISCSI_OP_SCSI_DATA_OUT:
1337 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1338 (unsigned char *)hdr);
1339 break;
1340 case ISCSI_OP_SCSI_TMFUNC:
1341 cmd = isert_allocate_cmd(conn, rx_desc);
1342 if (!cmd)
1343 break;
1344
1345 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1346 (unsigned char *)hdr);
1347 break;
1348 case ISCSI_OP_LOGOUT:
1349 cmd = isert_allocate_cmd(conn, rx_desc);
1350 if (!cmd)
1351 break;
1352
1353 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1354 break;
1355 case ISCSI_OP_TEXT:
1356 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1357 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1358 else
1359 cmd = isert_allocate_cmd(conn, rx_desc);
1360
1361 if (!cmd)
1362 break;
1363
1364 isert_cmd = iscsit_priv_cmd(cmd);
1365 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1366 rx_desc, (struct iscsi_text *)hdr);
1367 break;
1368 default:
1369 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1370 dump_stack();
1371 break;
1372 }
1373
1374 return ret;
1375 }
1376
1377 static void
1378 isert_print_wc(struct ib_wc *wc, const char *type)
1379 {
1380 if (wc->status != IB_WC_WR_FLUSH_ERR)
1381 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1382 ib_wc_status_msg(wc->status), wc->status,
1383 wc->vendor_err);
1384 else
1385 isert_dbg("%s failure: %s (%d)\n", type,
1386 ib_wc_status_msg(wc->status), wc->status);
1387 }
1388
1389 static void
1390 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1391 {
1392 struct isert_conn *isert_conn = wc->qp->qp_context;
1393 struct ib_device *ib_dev = isert_conn->cm_id->device;
1394 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1395 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1396 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1397 uint64_t read_va = 0, write_va = 0;
1398 uint32_t read_stag = 0, write_stag = 0;
1399
1400 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1401 isert_print_wc(wc, "recv");
1402 if (wc->status != IB_WC_WR_FLUSH_ERR)
1403 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1404 return;
1405 }
1406
1407 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1408 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1409
1410 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1411 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1412 (int)(wc->byte_len - ISER_HEADERS_LEN));
1413
1414 switch (iser_ctrl->flags & 0xF0) {
1415 case ISCSI_CTRL:
1416 if (iser_ctrl->flags & ISER_RSV) {
1417 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1418 read_va = be64_to_cpu(iser_ctrl->read_va);
1419 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1420 read_stag, (unsigned long long)read_va);
1421 }
1422 if (iser_ctrl->flags & ISER_WSV) {
1423 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1424 write_va = be64_to_cpu(iser_ctrl->write_va);
1425 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1426 write_stag, (unsigned long long)write_va);
1427 }
1428
1429 isert_dbg("ISER ISCSI_CTRL PDU\n");
1430 break;
1431 case ISER_HELLO:
1432 isert_err("iSER Hello message\n");
1433 break;
1434 default:
1435 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1436 break;
1437 }
1438
1439 isert_rx_opcode(isert_conn, rx_desc,
1440 read_stag, read_va, write_stag, write_va);
1441
1442 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1443 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1444 }
1445
1446 static void
1447 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1448 {
1449 struct isert_conn *isert_conn = wc->qp->qp_context;
1450 struct ib_device *ib_dev = isert_conn->cm_id->device;
1451
1452 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1453 isert_print_wc(wc, "login recv");
1454 return;
1455 }
1456
1457 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1458 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1459
1460 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1461
1462 if (isert_conn->conn) {
1463 struct iscsi_login *login = isert_conn->conn->conn_login;
1464
1465 if (login && !login->first_request)
1466 isert_rx_login_req(isert_conn);
1467 }
1468
1469 mutex_lock(&isert_conn->mutex);
1470 complete(&isert_conn->login_req_comp);
1471 mutex_unlock(&isert_conn->mutex);
1472
1473 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1474 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1475 }
1476
1477 static void
1478 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1479 {
1480 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1481 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1482
1483 if (!cmd->rw.nr_ops)
1484 return;
1485
1486 if (isert_prot_cmd(conn, se_cmd)) {
1487 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1488 conn->cm_id->port_num, se_cmd->t_data_sg,
1489 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1490 se_cmd->t_prot_nents, dir);
1491 } else {
1492 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1493 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1494 }
1495
1496 cmd->rw.nr_ops = 0;
1497 }
1498
1499 static void
1500 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1501 {
1502 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1503 struct isert_conn *isert_conn = isert_cmd->conn;
1504 struct iscsi_conn *conn = isert_conn->conn;
1505 struct iscsi_text_rsp *hdr;
1506
1507 isert_dbg("Cmd %p\n", isert_cmd);
1508
1509 switch (cmd->iscsi_opcode) {
1510 case ISCSI_OP_SCSI_CMD:
1511 spin_lock_bh(&conn->cmd_lock);
1512 if (!list_empty(&cmd->i_conn_node))
1513 list_del_init(&cmd->i_conn_node);
1514 spin_unlock_bh(&conn->cmd_lock);
1515
1516 if (cmd->data_direction == DMA_TO_DEVICE) {
1517 iscsit_stop_dataout_timer(cmd);
1518 /*
1519 * Check for special case during comp_err where
1520 * WRITE_PENDING has been handed off from core,
1521 * but requires an extra target_put_sess_cmd()
1522 * before transport_generic_free_cmd() below.
1523 */
1524 if (comp_err &&
1525 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1526 struct se_cmd *se_cmd = &cmd->se_cmd;
1527
1528 target_put_sess_cmd(se_cmd);
1529 }
1530 }
1531
1532 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1533 transport_generic_free_cmd(&cmd->se_cmd, 0);
1534 break;
1535 case ISCSI_OP_SCSI_TMFUNC:
1536 spin_lock_bh(&conn->cmd_lock);
1537 if (!list_empty(&cmd->i_conn_node))
1538 list_del_init(&cmd->i_conn_node);
1539 spin_unlock_bh(&conn->cmd_lock);
1540
1541 transport_generic_free_cmd(&cmd->se_cmd, 0);
1542 break;
1543 case ISCSI_OP_REJECT:
1544 case ISCSI_OP_NOOP_OUT:
1545 case ISCSI_OP_TEXT:
1546 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1547 /* If the continue bit is on, keep the command alive */
1548 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1549 break;
1550
1551 spin_lock_bh(&conn->cmd_lock);
1552 if (!list_empty(&cmd->i_conn_node))
1553 list_del_init(&cmd->i_conn_node);
1554 spin_unlock_bh(&conn->cmd_lock);
1555
1556 /*
1557 * Handle special case for REJECT when iscsi_add_reject*() has
1558 * overwritten the original iscsi_opcode assignment, and the
1559 * associated cmd->se_cmd needs to be released.
1560 */
1561 if (cmd->se_cmd.se_tfo != NULL) {
1562 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1563 cmd->iscsi_opcode);
1564 transport_generic_free_cmd(&cmd->se_cmd, 0);
1565 break;
1566 }
1567 /*
1568 * Fall-through
1569 */
1570 default:
1571 iscsit_release_cmd(cmd);
1572 break;
1573 }
1574 }
1575
1576 static void
1577 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1578 {
1579 if (tx_desc->dma_addr != 0) {
1580 isert_dbg("unmap single for tx_desc->dma_addr\n");
1581 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1582 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1583 tx_desc->dma_addr = 0;
1584 }
1585 }
1586
1587 static void
1588 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1589 struct ib_device *ib_dev, bool comp_err)
1590 {
1591 if (isert_cmd->pdu_buf_dma != 0) {
1592 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1593 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1594 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1595 isert_cmd->pdu_buf_dma = 0;
1596 }
1597
1598 isert_unmap_tx_desc(tx_desc, ib_dev);
1599 isert_put_cmd(isert_cmd, comp_err);
1600 }
1601
1602 static int
1603 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1604 {
1605 struct ib_mr_status mr_status;
1606 int ret;
1607
1608 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1609 if (ret) {
1610 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1611 goto fail_mr_status;
1612 }
1613
1614 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1615 u64 sec_offset_err;
1616 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1617
1618 switch (mr_status.sig_err.err_type) {
1619 case IB_SIG_BAD_GUARD:
1620 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1621 break;
1622 case IB_SIG_BAD_REFTAG:
1623 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1624 break;
1625 case IB_SIG_BAD_APPTAG:
1626 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1627 break;
1628 }
1629 sec_offset_err = mr_status.sig_err.sig_err_offset;
1630 do_div(sec_offset_err, block_size);
1631 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1632
1633 isert_err("PI error found type %d at sector 0x%llx "
1634 "expected 0x%x vs actual 0x%x\n",
1635 mr_status.sig_err.err_type,
1636 (unsigned long long)se_cmd->bad_sector,
1637 mr_status.sig_err.expected,
1638 mr_status.sig_err.actual);
1639 ret = 1;
1640 }
1641
1642 fail_mr_status:
1643 return ret;
1644 }
1645
1646 static void
1647 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1648 {
1649 struct isert_conn *isert_conn = wc->qp->qp_context;
1650 struct isert_device *device = isert_conn->device;
1651 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1652 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1653 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1654 int ret = 0;
1655
1656 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1657 isert_print_wc(wc, "rdma write");
1658 if (wc->status != IB_WC_WR_FLUSH_ERR)
1659 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1660 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1661 return;
1662 }
1663
1664 isert_dbg("Cmd %p\n", isert_cmd);
1665
1666 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1667 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1668
1669 if (ret)
1670 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1671 else
1672 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1673 }
1674
1675 static void
1676 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1677 {
1678 struct isert_conn *isert_conn = wc->qp->qp_context;
1679 struct isert_device *device = isert_conn->device;
1680 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1681 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1682 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1683 struct se_cmd *se_cmd = &cmd->se_cmd;
1684 int ret = 0;
1685
1686 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1687 isert_print_wc(wc, "rdma read");
1688 if (wc->status != IB_WC_WR_FLUSH_ERR)
1689 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1690 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1691 return;
1692 }
1693
1694 isert_dbg("Cmd %p\n", isert_cmd);
1695
1696 iscsit_stop_dataout_timer(cmd);
1697
1698 if (isert_prot_cmd(isert_conn, se_cmd))
1699 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1700 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1701 cmd->write_data_done = 0;
1702
1703 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1704 spin_lock_bh(&cmd->istate_lock);
1705 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1706 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1707 spin_unlock_bh(&cmd->istate_lock);
1708
1709 if (ret) {
1710 target_put_sess_cmd(se_cmd);
1711 transport_send_check_condition_and_sense(se_cmd,
1712 se_cmd->pi_err, 0);
1713 } else {
1714 target_execute_cmd(se_cmd);
1715 }
1716 }
1717
1718 static void
1719 isert_do_control_comp(struct work_struct *work)
1720 {
1721 struct isert_cmd *isert_cmd = container_of(work,
1722 struct isert_cmd, comp_work);
1723 struct isert_conn *isert_conn = isert_cmd->conn;
1724 struct ib_device *ib_dev = isert_conn->cm_id->device;
1725 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1726
1727 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1728
1729 switch (cmd->i_state) {
1730 case ISTATE_SEND_TASKMGTRSP:
1731 iscsit_tmr_post_handler(cmd, cmd->conn);
1732 case ISTATE_SEND_REJECT: /* FALLTHRU */
1733 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1734 cmd->i_state = ISTATE_SENT_STATUS;
1735 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1736 ib_dev, false);
1737 break;
1738 case ISTATE_SEND_LOGOUTRSP:
1739 iscsit_logout_post_handler(cmd, cmd->conn);
1740 break;
1741 default:
1742 isert_err("Unknown i_state %d\n", cmd->i_state);
1743 dump_stack();
1744 break;
1745 }
1746 }
1747
1748 static void
1749 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1750 {
1751 struct isert_conn *isert_conn = wc->qp->qp_context;
1752 struct ib_device *ib_dev = isert_conn->cm_id->device;
1753 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1754
1755 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1756 isert_print_wc(wc, "login send");
1757 if (wc->status != IB_WC_WR_FLUSH_ERR)
1758 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1759 }
1760
1761 isert_unmap_tx_desc(tx_desc, ib_dev);
1762 }
1763
1764 static void
1765 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1766 {
1767 struct isert_conn *isert_conn = wc->qp->qp_context;
1768 struct ib_device *ib_dev = isert_conn->cm_id->device;
1769 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1770 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1771
1772 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1773 isert_print_wc(wc, "send");
1774 if (wc->status != IB_WC_WR_FLUSH_ERR)
1775 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1776 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1777 return;
1778 }
1779
1780 isert_dbg("Cmd %p\n", isert_cmd);
1781
1782 switch (isert_cmd->iscsi_cmd->i_state) {
1783 case ISTATE_SEND_TASKMGTRSP:
1784 case ISTATE_SEND_LOGOUTRSP:
1785 case ISTATE_SEND_REJECT:
1786 case ISTATE_SEND_TEXTRSP:
1787 isert_unmap_tx_desc(tx_desc, ib_dev);
1788
1789 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1790 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1791 return;
1792 default:
1793 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1794 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1795 break;
1796 }
1797 }
1798
1799 static int
1800 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1801 {
1802 struct ib_send_wr *wr_failed;
1803 int ret;
1804
1805 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1806 if (ret) {
1807 isert_err("ib_post_recv failed with %d\n", ret);
1808 return ret;
1809 }
1810
1811 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1812 &wr_failed);
1813 if (ret) {
1814 isert_err("ib_post_send failed with %d\n", ret);
1815 return ret;
1816 }
1817 return ret;
1818 }
1819
1820 static int
1821 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1822 {
1823 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1824 struct isert_conn *isert_conn = conn->context;
1825 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1826 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1827 &isert_cmd->tx_desc.iscsi_header;
1828
1829 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1830 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1831 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1832 /*
1833 * Attach SENSE DATA payload to iSCSI Response PDU
1834 */
1835 if (cmd->se_cmd.sense_buffer &&
1836 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1837 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1838 struct isert_device *device = isert_conn->device;
1839 struct ib_device *ib_dev = device->ib_device;
1840 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1841 u32 padding, pdu_len;
1842
1843 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1844 cmd->sense_buffer);
1845 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1846
1847 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1848 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1849 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1850
1851 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1852 (void *)cmd->sense_buffer, pdu_len,
1853 DMA_TO_DEVICE);
1854
1855 isert_cmd->pdu_buf_len = pdu_len;
1856 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1857 tx_dsg->length = pdu_len;
1858 tx_dsg->lkey = device->pd->local_dma_lkey;
1859 isert_cmd->tx_desc.num_sge = 2;
1860 }
1861
1862 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1863
1864 isert_dbg("Posting SCSI Response\n");
1865
1866 return isert_post_response(isert_conn, isert_cmd);
1867 }
1868
1869 static void
1870 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1871 {
1872 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1873 struct isert_conn *isert_conn = conn->context;
1874
1875 spin_lock_bh(&conn->cmd_lock);
1876 if (!list_empty(&cmd->i_conn_node))
1877 list_del_init(&cmd->i_conn_node);
1878 spin_unlock_bh(&conn->cmd_lock);
1879
1880 if (cmd->data_direction == DMA_TO_DEVICE)
1881 iscsit_stop_dataout_timer(cmd);
1882 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1883 }
1884
1885 static enum target_prot_op
1886 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1887 {
1888 struct isert_conn *isert_conn = conn->context;
1889 struct isert_device *device = isert_conn->device;
1890
1891 if (conn->tpg->tpg_attrib.t10_pi) {
1892 if (device->pi_capable) {
1893 isert_info("conn %p PI offload enabled\n", isert_conn);
1894 isert_conn->pi_support = true;
1895 return TARGET_PROT_ALL;
1896 }
1897 }
1898
1899 isert_info("conn %p PI offload disabled\n", isert_conn);
1900 isert_conn->pi_support = false;
1901
1902 return TARGET_PROT_NORMAL;
1903 }
1904
1905 static int
1906 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1907 bool nopout_response)
1908 {
1909 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1910 struct isert_conn *isert_conn = conn->context;
1911 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1912
1913 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1914 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1915 &isert_cmd->tx_desc.iscsi_header,
1916 nopout_response);
1917 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1918 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1919
1920 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1921
1922 return isert_post_response(isert_conn, isert_cmd);
1923 }
1924
1925 static int
1926 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1927 {
1928 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1929 struct isert_conn *isert_conn = conn->context;
1930 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1931
1932 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1933 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1934 &isert_cmd->tx_desc.iscsi_header);
1935 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1936 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1937
1938 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1939
1940 return isert_post_response(isert_conn, isert_cmd);
1941 }
1942
1943 static int
1944 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1945 {
1946 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1947 struct isert_conn *isert_conn = conn->context;
1948 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1949
1950 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1951 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1952 &isert_cmd->tx_desc.iscsi_header);
1953 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1954 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1955
1956 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1957
1958 return isert_post_response(isert_conn, isert_cmd);
1959 }
1960
1961 static int
1962 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1963 {
1964 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1965 struct isert_conn *isert_conn = conn->context;
1966 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1967 struct isert_device *device = isert_conn->device;
1968 struct ib_device *ib_dev = device->ib_device;
1969 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1970 struct iscsi_reject *hdr =
1971 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1972
1973 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1974 iscsit_build_reject(cmd, conn, hdr);
1975 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976
1977 hton24(hdr->dlength, ISCSI_HDR_LEN);
1978 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1979 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1980 DMA_TO_DEVICE);
1981 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1982 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1983 tx_dsg->length = ISCSI_HDR_LEN;
1984 tx_dsg->lkey = device->pd->local_dma_lkey;
1985 isert_cmd->tx_desc.num_sge = 2;
1986
1987 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1988
1989 isert_dbg("conn %p Posting Reject\n", isert_conn);
1990
1991 return isert_post_response(isert_conn, isert_cmd);
1992 }
1993
1994 static int
1995 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1996 {
1997 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1998 struct isert_conn *isert_conn = conn->context;
1999 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2000 struct iscsi_text_rsp *hdr =
2001 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2002 u32 txt_rsp_len;
2003 int rc;
2004
2005 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2006 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2007 if (rc < 0)
2008 return rc;
2009
2010 txt_rsp_len = rc;
2011 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2012
2013 if (txt_rsp_len) {
2014 struct isert_device *device = isert_conn->device;
2015 struct ib_device *ib_dev = device->ib_device;
2016 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2017 void *txt_rsp_buf = cmd->buf_ptr;
2018
2019 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2020 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2021
2022 isert_cmd->pdu_buf_len = txt_rsp_len;
2023 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2024 tx_dsg->length = txt_rsp_len;
2025 tx_dsg->lkey = device->pd->local_dma_lkey;
2026 isert_cmd->tx_desc.num_sge = 2;
2027 }
2028 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2029
2030 isert_dbg("conn %p Text Response\n", isert_conn);
2031
2032 return isert_post_response(isert_conn, isert_cmd);
2033 }
2034
2035 static inline void
2036 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2037 struct ib_sig_domain *domain)
2038 {
2039 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2040 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2041 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2042 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2043 /*
2044 * At the moment we hard code those, but if in the future
2045 * the target core would like to use it, we will take it
2046 * from se_cmd.
2047 */
2048 domain->sig.dif.apptag_check_mask = 0xffff;
2049 domain->sig.dif.app_escape = true;
2050 domain->sig.dif.ref_escape = true;
2051 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2052 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2053 domain->sig.dif.ref_remap = true;
2054 };
2055
2056 static int
2057 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2058 {
2059 memset(sig_attrs, 0, sizeof(*sig_attrs));
2060
2061 switch (se_cmd->prot_op) {
2062 case TARGET_PROT_DIN_INSERT:
2063 case TARGET_PROT_DOUT_STRIP:
2064 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2065 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2066 break;
2067 case TARGET_PROT_DOUT_INSERT:
2068 case TARGET_PROT_DIN_STRIP:
2069 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2070 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2071 break;
2072 case TARGET_PROT_DIN_PASS:
2073 case TARGET_PROT_DOUT_PASS:
2074 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2075 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2076 break;
2077 default:
2078 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2079 return -EINVAL;
2080 }
2081
2082 sig_attrs->check_mask =
2083 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2084 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2085 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2086 return 0;
2087 }
2088
2089 static int
2090 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2091 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2092 {
2093 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2094 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2095 u8 port_num = conn->cm_id->port_num;
2096 u64 addr;
2097 u32 rkey, offset;
2098 int ret;
2099
2100 if (dir == DMA_FROM_DEVICE) {
2101 addr = cmd->write_va;
2102 rkey = cmd->write_stag;
2103 offset = cmd->iscsi_cmd->write_data_done;
2104 } else {
2105 addr = cmd->read_va;
2106 rkey = cmd->read_stag;
2107 offset = 0;
2108 }
2109
2110 if (isert_prot_cmd(conn, se_cmd)) {
2111 struct ib_sig_attrs sig_attrs;
2112
2113 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2114 if (ret)
2115 return ret;
2116
2117 WARN_ON_ONCE(offset);
2118 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2119 se_cmd->t_data_sg, se_cmd->t_data_nents,
2120 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2121 &sig_attrs, addr, rkey, dir);
2122 } else {
2123 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2124 se_cmd->t_data_sg, se_cmd->t_data_nents,
2125 offset, addr, rkey, dir);
2126 }
2127 if (ret < 0) {
2128 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2129 return ret;
2130 }
2131
2132 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2133 if (ret < 0)
2134 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2135 return ret;
2136 }
2137
2138 static int
2139 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2140 {
2141 struct se_cmd *se_cmd = &cmd->se_cmd;
2142 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2143 struct isert_conn *isert_conn = conn->context;
2144 struct ib_cqe *cqe = NULL;
2145 struct ib_send_wr *chain_wr = NULL;
2146 int rc;
2147
2148 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2149 isert_cmd, se_cmd->data_length);
2150
2151 if (isert_prot_cmd(isert_conn, se_cmd)) {
2152 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2153 cqe = &isert_cmd->tx_desc.tx_cqe;
2154 } else {
2155 /*
2156 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2157 */
2158 isert_create_send_desc(isert_conn, isert_cmd,
2159 &isert_cmd->tx_desc);
2160 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2161 &isert_cmd->tx_desc.iscsi_header);
2162 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2163 isert_init_send_wr(isert_conn, isert_cmd,
2164 &isert_cmd->tx_desc.send_wr);
2165
2166 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2167 if (rc) {
2168 isert_err("ib_post_recv failed with %d\n", rc);
2169 return rc;
2170 }
2171
2172 chain_wr = &isert_cmd->tx_desc.send_wr;
2173 }
2174
2175 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2176 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2177 return 1;
2178 }
2179
2180 static int
2181 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2182 {
2183 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2184
2185 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2186 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2187
2188 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2189 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2190 &isert_cmd->tx_desc.tx_cqe, NULL);
2191
2192 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2193 isert_cmd);
2194 return 0;
2195 }
2196
2197 static int
2198 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2199 {
2200 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2201 int ret = 0;
2202
2203 switch (state) {
2204 case ISTATE_REMOVE:
2205 spin_lock_bh(&conn->cmd_lock);
2206 list_del_init(&cmd->i_conn_node);
2207 spin_unlock_bh(&conn->cmd_lock);
2208 isert_put_cmd(isert_cmd, true);
2209 break;
2210 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2211 ret = isert_put_nopin(cmd, conn, false);
2212 break;
2213 default:
2214 isert_err("Unknown immediate state: 0x%02x\n", state);
2215 ret = -EINVAL;
2216 break;
2217 }
2218
2219 return ret;
2220 }
2221
2222 static int
2223 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2224 {
2225 struct isert_conn *isert_conn = conn->context;
2226 int ret;
2227
2228 switch (state) {
2229 case ISTATE_SEND_LOGOUTRSP:
2230 ret = isert_put_logout_rsp(cmd, conn);
2231 if (!ret)
2232 isert_conn->logout_posted = true;
2233 break;
2234 case ISTATE_SEND_NOPIN:
2235 ret = isert_put_nopin(cmd, conn, true);
2236 break;
2237 case ISTATE_SEND_TASKMGTRSP:
2238 ret = isert_put_tm_rsp(cmd, conn);
2239 break;
2240 case ISTATE_SEND_REJECT:
2241 ret = isert_put_reject(cmd, conn);
2242 break;
2243 case ISTATE_SEND_TEXTRSP:
2244 ret = isert_put_text_rsp(cmd, conn);
2245 break;
2246 case ISTATE_SEND_STATUS:
2247 /*
2248 * Special case for sending non GOOD SCSI status from TX thread
2249 * context during pre se_cmd excecution failure.
2250 */
2251 ret = isert_put_response(conn, cmd);
2252 break;
2253 default:
2254 isert_err("Unknown response state: 0x%02x\n", state);
2255 ret = -EINVAL;
2256 break;
2257 }
2258
2259 return ret;
2260 }
2261
2262 struct rdma_cm_id *
2263 isert_setup_id(struct isert_np *isert_np)
2264 {
2265 struct iscsi_np *np = isert_np->np;
2266 struct rdma_cm_id *id;
2267 struct sockaddr *sa;
2268 int ret;
2269
2270 sa = (struct sockaddr *)&np->np_sockaddr;
2271 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2272
2273 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2274 RDMA_PS_TCP, IB_QPT_RC);
2275 if (IS_ERR(id)) {
2276 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2277 ret = PTR_ERR(id);
2278 goto out;
2279 }
2280 isert_dbg("id %p context %p\n", id, id->context);
2281
2282 ret = rdma_bind_addr(id, sa);
2283 if (ret) {
2284 isert_err("rdma_bind_addr() failed: %d\n", ret);
2285 goto out_id;
2286 }
2287
2288 ret = rdma_listen(id, 0);
2289 if (ret) {
2290 isert_err("rdma_listen() failed: %d\n", ret);
2291 goto out_id;
2292 }
2293
2294 return id;
2295 out_id:
2296 rdma_destroy_id(id);
2297 out:
2298 return ERR_PTR(ret);
2299 }
2300
2301 static int
2302 isert_setup_np(struct iscsi_np *np,
2303 struct sockaddr_storage *ksockaddr)
2304 {
2305 struct isert_np *isert_np;
2306 struct rdma_cm_id *isert_lid;
2307 int ret;
2308
2309 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2310 if (!isert_np) {
2311 isert_err("Unable to allocate struct isert_np\n");
2312 return -ENOMEM;
2313 }
2314 sema_init(&isert_np->sem, 0);
2315 mutex_init(&isert_np->mutex);
2316 INIT_LIST_HEAD(&isert_np->accepted);
2317 INIT_LIST_HEAD(&isert_np->pending);
2318 isert_np->np = np;
2319
2320 /*
2321 * Setup the np->np_sockaddr from the passed sockaddr setup
2322 * in iscsi_target_configfs.c code..
2323 */
2324 memcpy(&np->np_sockaddr, ksockaddr,
2325 sizeof(struct sockaddr_storage));
2326
2327 isert_lid = isert_setup_id(isert_np);
2328 if (IS_ERR(isert_lid)) {
2329 ret = PTR_ERR(isert_lid);
2330 goto out;
2331 }
2332
2333 isert_np->cm_id = isert_lid;
2334 np->np_context = isert_np;
2335
2336 return 0;
2337
2338 out:
2339 kfree(isert_np);
2340
2341 return ret;
2342 }
2343
2344 static int
2345 isert_rdma_accept(struct isert_conn *isert_conn)
2346 {
2347 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2348 struct rdma_conn_param cp;
2349 int ret;
2350 struct iser_cm_hdr rsp_hdr;
2351
2352 memset(&cp, 0, sizeof(struct rdma_conn_param));
2353 cp.initiator_depth = isert_conn->initiator_depth;
2354 cp.retry_count = 7;
2355 cp.rnr_retry_count = 7;
2356
2357 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2358 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2359 if (!isert_conn->snd_w_inv)
2360 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2361 cp.private_data = (void *)&rsp_hdr;
2362 cp.private_data_len = sizeof(rsp_hdr);
2363
2364 ret = rdma_accept(cm_id, &cp);
2365 if (ret) {
2366 isert_err("rdma_accept() failed with: %d\n", ret);
2367 return ret;
2368 }
2369
2370 return 0;
2371 }
2372
2373 static int
2374 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2375 {
2376 struct isert_conn *isert_conn = conn->context;
2377 int ret;
2378
2379 isert_info("before login_req comp conn: %p\n", isert_conn);
2380 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2381 if (ret) {
2382 isert_err("isert_conn %p interrupted before got login req\n",
2383 isert_conn);
2384 return ret;
2385 }
2386 reinit_completion(&isert_conn->login_req_comp);
2387
2388 /*
2389 * For login requests after the first PDU, isert_rx_login_req() will
2390 * kick schedule_delayed_work(&conn->login_work) as the packet is
2391 * received, which turns this callback from iscsi_target_do_login_rx()
2392 * into a NOP.
2393 */
2394 if (!login->first_request)
2395 return 0;
2396
2397 isert_rx_login_req(isert_conn);
2398
2399 isert_info("before login_comp conn: %p\n", conn);
2400 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2401 if (ret)
2402 return ret;
2403
2404 isert_info("processing login->req: %p\n", login->req);
2405
2406 return 0;
2407 }
2408
2409 static void
2410 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2411 struct isert_conn *isert_conn)
2412 {
2413 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2414 struct rdma_route *cm_route = &cm_id->route;
2415
2416 conn->login_family = np->np_sockaddr.ss_family;
2417
2418 conn->login_sockaddr = cm_route->addr.dst_addr;
2419 conn->local_sockaddr = cm_route->addr.src_addr;
2420 }
2421
2422 static int
2423 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2424 {
2425 struct isert_np *isert_np = np->np_context;
2426 struct isert_conn *isert_conn;
2427 int ret;
2428
2429 accept_wait:
2430 ret = down_interruptible(&isert_np->sem);
2431 if (ret)
2432 return -ENODEV;
2433
2434 spin_lock_bh(&np->np_thread_lock);
2435 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2436 spin_unlock_bh(&np->np_thread_lock);
2437 isert_dbg("np_thread_state %d\n",
2438 np->np_thread_state);
2439 /**
2440 * No point in stalling here when np_thread
2441 * is in state RESET/SHUTDOWN/EXIT - bail
2442 **/
2443 return -ENODEV;
2444 }
2445 spin_unlock_bh(&np->np_thread_lock);
2446
2447 mutex_lock(&isert_np->mutex);
2448 if (list_empty(&isert_np->pending)) {
2449 mutex_unlock(&isert_np->mutex);
2450 goto accept_wait;
2451 }
2452 isert_conn = list_first_entry(&isert_np->pending,
2453 struct isert_conn, node);
2454 list_del_init(&isert_conn->node);
2455 mutex_unlock(&isert_np->mutex);
2456
2457 conn->context = isert_conn;
2458 isert_conn->conn = conn;
2459 isert_conn->state = ISER_CONN_BOUND;
2460
2461 isert_set_conn_info(np, conn, isert_conn);
2462
2463 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2464
2465 return 0;
2466 }
2467
2468 static void
2469 isert_free_np(struct iscsi_np *np)
2470 {
2471 struct isert_np *isert_np = np->np_context;
2472 struct isert_conn *isert_conn, *n;
2473
2474 if (isert_np->cm_id)
2475 rdma_destroy_id(isert_np->cm_id);
2476
2477 /*
2478 * FIXME: At this point we don't have a good way to insure
2479 * that at this point we don't have hanging connections that
2480 * completed RDMA establishment but didn't start iscsi login
2481 * process. So work-around this by cleaning up what ever piled
2482 * up in accepted and pending lists.
2483 */
2484 mutex_lock(&isert_np->mutex);
2485 if (!list_empty(&isert_np->pending)) {
2486 isert_info("Still have isert pending connections\n");
2487 list_for_each_entry_safe(isert_conn, n,
2488 &isert_np->pending,
2489 node) {
2490 isert_info("cleaning isert_conn %p state (%d)\n",
2491 isert_conn, isert_conn->state);
2492 isert_connect_release(isert_conn);
2493 }
2494 }
2495
2496 if (!list_empty(&isert_np->accepted)) {
2497 isert_info("Still have isert accepted connections\n");
2498 list_for_each_entry_safe(isert_conn, n,
2499 &isert_np->accepted,
2500 node) {
2501 isert_info("cleaning isert_conn %p state (%d)\n",
2502 isert_conn, isert_conn->state);
2503 isert_connect_release(isert_conn);
2504 }
2505 }
2506 mutex_unlock(&isert_np->mutex);
2507
2508 np->np_context = NULL;
2509 kfree(isert_np);
2510 }
2511
2512 static void isert_release_work(struct work_struct *work)
2513 {
2514 struct isert_conn *isert_conn = container_of(work,
2515 struct isert_conn,
2516 release_work);
2517
2518 isert_info("Starting release conn %p\n", isert_conn);
2519
2520 mutex_lock(&isert_conn->mutex);
2521 isert_conn->state = ISER_CONN_DOWN;
2522 mutex_unlock(&isert_conn->mutex);
2523
2524 isert_info("Destroying conn %p\n", isert_conn);
2525 isert_put_conn(isert_conn);
2526 }
2527
2528 static void
2529 isert_wait4logout(struct isert_conn *isert_conn)
2530 {
2531 struct iscsi_conn *conn = isert_conn->conn;
2532
2533 isert_info("conn %p\n", isert_conn);
2534
2535 if (isert_conn->logout_posted) {
2536 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2537 wait_for_completion_timeout(&conn->conn_logout_comp,
2538 SECONDS_FOR_LOGOUT_COMP * HZ);
2539 }
2540 }
2541
2542 static void
2543 isert_wait4cmds(struct iscsi_conn *conn)
2544 {
2545 isert_info("iscsi_conn %p\n", conn);
2546
2547 if (conn->sess) {
2548 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2549 target_wait_for_sess_cmds(conn->sess->se_sess);
2550 }
2551 }
2552
2553 /**
2554 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2555 * unsolicitate dataout
2556 * @conn: iscsi connection
2557 *
2558 * We might still have commands that are waiting for unsolicited
2559 * dataouts messages. We must put the extra reference on those
2560 * before blocking on the target_wait_for_session_cmds
2561 */
2562 static void
2563 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2564 {
2565 struct iscsi_cmd *cmd, *tmp;
2566 static LIST_HEAD(drop_cmd_list);
2567
2568 spin_lock_bh(&conn->cmd_lock);
2569 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2570 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2571 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2572 (cmd->write_data_done < cmd->se_cmd.data_length))
2573 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2574 }
2575 spin_unlock_bh(&conn->cmd_lock);
2576
2577 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2578 list_del_init(&cmd->i_conn_node);
2579 if (cmd->i_state != ISTATE_REMOVE) {
2580 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2581
2582 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2583 isert_put_cmd(isert_cmd, true);
2584 }
2585 }
2586 }
2587
2588 static void isert_wait_conn(struct iscsi_conn *conn)
2589 {
2590 struct isert_conn *isert_conn = conn->context;
2591
2592 isert_info("Starting conn %p\n", isert_conn);
2593
2594 mutex_lock(&isert_conn->mutex);
2595 isert_conn_terminate(isert_conn);
2596 mutex_unlock(&isert_conn->mutex);
2597
2598 ib_drain_qp(isert_conn->qp);
2599 isert_put_unsol_pending_cmds(conn);
2600 isert_wait4cmds(conn);
2601 isert_wait4logout(isert_conn);
2602
2603 queue_work(isert_release_wq, &isert_conn->release_work);
2604 }
2605
2606 static void isert_free_conn(struct iscsi_conn *conn)
2607 {
2608 struct isert_conn *isert_conn = conn->context;
2609
2610 ib_drain_qp(isert_conn->qp);
2611 isert_put_conn(isert_conn);
2612 }
2613
2614 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2615 {
2616 struct completion comp;
2617
2618 init_completion(&comp);
2619
2620 wait_for_completion_interruptible(&comp);
2621 }
2622
2623 static struct iscsit_transport iser_target_transport = {
2624 .name = "IB/iSER",
2625 .transport_type = ISCSI_INFINIBAND,
2626 .rdma_shutdown = true,
2627 .priv_size = sizeof(struct isert_cmd),
2628 .owner = THIS_MODULE,
2629 .iscsit_setup_np = isert_setup_np,
2630 .iscsit_accept_np = isert_accept_np,
2631 .iscsit_free_np = isert_free_np,
2632 .iscsit_wait_conn = isert_wait_conn,
2633 .iscsit_free_conn = isert_free_conn,
2634 .iscsit_get_login_rx = isert_get_login_rx,
2635 .iscsit_put_login_tx = isert_put_login_tx,
2636 .iscsit_immediate_queue = isert_immediate_queue,
2637 .iscsit_response_queue = isert_response_queue,
2638 .iscsit_get_dataout = isert_get_dataout,
2639 .iscsit_queue_data_in = isert_put_datain,
2640 .iscsit_queue_status = isert_put_response,
2641 .iscsit_aborted_task = isert_aborted_task,
2642 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2643 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2644 };
2645
2646 static int __init isert_init(void)
2647 {
2648 int ret;
2649
2650 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2651 WQ_UNBOUND | WQ_HIGHPRI, 0);
2652 if (!isert_comp_wq) {
2653 isert_err("Unable to allocate isert_comp_wq\n");
2654 ret = -ENOMEM;
2655 return -ENOMEM;
2656 }
2657
2658 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2659 WQ_UNBOUND_MAX_ACTIVE);
2660 if (!isert_release_wq) {
2661 isert_err("Unable to allocate isert_release_wq\n");
2662 ret = -ENOMEM;
2663 goto destroy_comp_wq;
2664 }
2665
2666 iscsit_register_transport(&iser_target_transport);
2667 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2668
2669 return 0;
2670
2671 destroy_comp_wq:
2672 destroy_workqueue(isert_comp_wq);
2673
2674 return ret;
2675 }
2676
2677 static void __exit isert_exit(void)
2678 {
2679 flush_scheduled_work();
2680 destroy_workqueue(isert_release_wq);
2681 destroy_workqueue(isert_comp_wq);
2682 iscsit_unregister_transport(&iser_target_transport);
2683 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2684 }
2685
2686 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2687 MODULE_VERSION("1.0");
2688 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2689 MODULE_LICENSE("GPL");
2690
2691 module_init(isert_init);
2692 module_exit(isert_exit);
Ubuntu Artful kernel mirror