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[thirdparty/kernel/stable.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains iSCSI extentions for RDMA (iSER) Verbs
4 *
5 * (c) Copyright 2013 Datera, Inc.
6 *
7 * Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ****************************************************************************/
10
11 #include <linux/string.h>
12 #include <linux/module.h>
13 #include <linux/scatterlist.h>
14 #include <linux/socket.h>
15 #include <linux/in.h>
16 #include <linux/in6.h>
17 #include <rdma/ib_verbs.h>
18 #include <rdma/rdma_cm.h>
19 #include <target/target_core_base.h>
20 #include <target/target_core_fabric.h>
21 #include <target/iscsi/iscsi_transport.h>
22 #include <linux/semaphore.h>
23
24 #include "ib_isert.h"
25
26 #define ISERT_MAX_CONN 8
27 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
28 #define ISER_MAX_TX_CQ_LEN \
29 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
30 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
31 ISERT_MAX_CONN)
32
33 static int isert_debug_level;
34 module_param_named(debug_level, isert_debug_level, int, 0644);
35 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
36
37 static DEFINE_MUTEX(device_list_mutex);
38 static LIST_HEAD(device_list);
39 static struct workqueue_struct *isert_comp_wq;
40 static struct workqueue_struct *isert_release_wq;
41
42 static int
43 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
44 static int
45 isert_login_post_recv(struct isert_conn *isert_conn);
46 static int
47 isert_rdma_accept(struct isert_conn *isert_conn);
48 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
49
50 static void isert_release_work(struct work_struct *work);
51 static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
52 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
53 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
54 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
55
56 static inline bool
57 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
58 {
59 return (conn->pi_support &&
60 cmd->prot_op != TARGET_PROT_NORMAL);
61 }
62
63
64 static void
65 isert_qp_event_callback(struct ib_event *e, void *context)
66 {
67 struct isert_conn *isert_conn = context;
68
69 isert_err("%s (%d): conn %p\n",
70 ib_event_msg(e->event), e->event, isert_conn);
71
72 switch (e->event) {
73 case IB_EVENT_COMM_EST:
74 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
75 break;
76 case IB_EVENT_QP_LAST_WQE_REACHED:
77 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
78 break;
79 default:
80 break;
81 }
82 }
83
84 static struct isert_comp *
85 isert_comp_get(struct isert_conn *isert_conn)
86 {
87 struct isert_device *device = isert_conn->device;
88 struct isert_comp *comp;
89 int i, min = 0;
90
91 mutex_lock(&device_list_mutex);
92 for (i = 0; i < device->comps_used; i++)
93 if (device->comps[i].active_qps <
94 device->comps[min].active_qps)
95 min = i;
96 comp = &device->comps[min];
97 comp->active_qps++;
98 mutex_unlock(&device_list_mutex);
99
100 isert_info("conn %p, using comp %p min_index: %d\n",
101 isert_conn, comp, min);
102
103 return comp;
104 }
105
106 static void
107 isert_comp_put(struct isert_comp *comp)
108 {
109 mutex_lock(&device_list_mutex);
110 comp->active_qps--;
111 mutex_unlock(&device_list_mutex);
112 }
113
114 static struct ib_qp *
115 isert_create_qp(struct isert_conn *isert_conn,
116 struct isert_comp *comp,
117 struct rdma_cm_id *cma_id)
118 {
119 struct isert_device *device = isert_conn->device;
120 struct ib_qp_init_attr attr;
121 int ret;
122
123 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
124 attr.event_handler = isert_qp_event_callback;
125 attr.qp_context = isert_conn;
126 attr.send_cq = comp->cq;
127 attr.recv_cq = comp->cq;
128 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
129 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
130 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
131 attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
132 attr.cap.max_recv_sge = 1;
133 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
134 attr.qp_type = IB_QPT_RC;
135 if (device->pi_capable)
136 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
137
138 ret = rdma_create_qp(cma_id, device->pd, &attr);
139 if (ret) {
140 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
141 return ERR_PTR(ret);
142 }
143
144 return cma_id->qp;
145 }
146
147 static int
148 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
149 {
150 struct isert_comp *comp;
151 int ret;
152
153 comp = isert_comp_get(isert_conn);
154 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
155 if (IS_ERR(isert_conn->qp)) {
156 ret = PTR_ERR(isert_conn->qp);
157 goto err;
158 }
159
160 return 0;
161 err:
162 isert_comp_put(comp);
163 return ret;
164 }
165
166 static int
167 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
168 {
169 struct isert_device *device = isert_conn->device;
170 struct ib_device *ib_dev = device->ib_device;
171 struct iser_rx_desc *rx_desc;
172 struct ib_sge *rx_sg;
173 u64 dma_addr;
174 int i, j;
175
176 isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
177 sizeof(struct iser_rx_desc),
178 GFP_KERNEL);
179 if (!isert_conn->rx_descs)
180 return -ENOMEM;
181
182 rx_desc = isert_conn->rx_descs;
183
184 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
185 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
186 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
187 if (ib_dma_mapping_error(ib_dev, dma_addr))
188 goto dma_map_fail;
189
190 rx_desc->dma_addr = dma_addr;
191
192 rx_sg = &rx_desc->rx_sg;
193 rx_sg->addr = rx_desc->dma_addr;
194 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
195 rx_sg->lkey = device->pd->local_dma_lkey;
196 rx_desc->rx_cqe.done = isert_recv_done;
197 }
198
199 return 0;
200
201 dma_map_fail:
202 rx_desc = isert_conn->rx_descs;
203 for (j = 0; j < i; j++, rx_desc++) {
204 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
205 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
206 }
207 kfree(isert_conn->rx_descs);
208 isert_conn->rx_descs = NULL;
209 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
210 return -ENOMEM;
211 }
212
213 static void
214 isert_free_rx_descriptors(struct isert_conn *isert_conn)
215 {
216 struct ib_device *ib_dev = isert_conn->device->ib_device;
217 struct iser_rx_desc *rx_desc;
218 int i;
219
220 if (!isert_conn->rx_descs)
221 return;
222
223 rx_desc = isert_conn->rx_descs;
224 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
225 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
226 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
227 }
228
229 kfree(isert_conn->rx_descs);
230 isert_conn->rx_descs = NULL;
231 }
232
233 static void
234 isert_free_comps(struct isert_device *device)
235 {
236 int i;
237
238 for (i = 0; i < device->comps_used; i++) {
239 struct isert_comp *comp = &device->comps[i];
240
241 if (comp->cq)
242 ib_free_cq(comp->cq);
243 }
244 kfree(device->comps);
245 }
246
247 static int
248 isert_alloc_comps(struct isert_device *device)
249 {
250 int i, max_cqe, ret = 0;
251
252 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
253 device->ib_device->num_comp_vectors));
254
255 isert_info("Using %d CQs, %s supports %d vectors support "
256 "pi_capable %d\n",
257 device->comps_used, dev_name(&device->ib_device->dev),
258 device->ib_device->num_comp_vectors,
259 device->pi_capable);
260
261 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
262 GFP_KERNEL);
263 if (!device->comps)
264 return -ENOMEM;
265
266 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
267
268 for (i = 0; i < device->comps_used; i++) {
269 struct isert_comp *comp = &device->comps[i];
270
271 comp->device = device;
272 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
273 IB_POLL_WORKQUEUE);
274 if (IS_ERR(comp->cq)) {
275 isert_err("Unable to allocate cq\n");
276 ret = PTR_ERR(comp->cq);
277 comp->cq = NULL;
278 goto out_cq;
279 }
280 }
281
282 return 0;
283 out_cq:
284 isert_free_comps(device);
285 return ret;
286 }
287
288 static int
289 isert_create_device_ib_res(struct isert_device *device)
290 {
291 struct ib_device *ib_dev = device->ib_device;
292 int ret;
293
294 isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
295 ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
296 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
297
298 ret = isert_alloc_comps(device);
299 if (ret)
300 goto out;
301
302 device->pd = ib_alloc_pd(ib_dev, 0);
303 if (IS_ERR(device->pd)) {
304 ret = PTR_ERR(device->pd);
305 isert_err("failed to allocate pd, device %p, ret=%d\n",
306 device, ret);
307 goto out_cq;
308 }
309
310 /* Check signature cap */
311 device->pi_capable = ib_dev->attrs.device_cap_flags &
312 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
313
314 return 0;
315
316 out_cq:
317 isert_free_comps(device);
318 out:
319 if (ret > 0)
320 ret = -EINVAL;
321 return ret;
322 }
323
324 static void
325 isert_free_device_ib_res(struct isert_device *device)
326 {
327 isert_info("device %p\n", device);
328
329 ib_dealloc_pd(device->pd);
330 isert_free_comps(device);
331 }
332
333 static void
334 isert_device_put(struct isert_device *device)
335 {
336 mutex_lock(&device_list_mutex);
337 device->refcount--;
338 isert_info("device %p refcount %d\n", device, device->refcount);
339 if (!device->refcount) {
340 isert_free_device_ib_res(device);
341 list_del(&device->dev_node);
342 kfree(device);
343 }
344 mutex_unlock(&device_list_mutex);
345 }
346
347 static struct isert_device *
348 isert_device_get(struct rdma_cm_id *cma_id)
349 {
350 struct isert_device *device;
351 int ret;
352
353 mutex_lock(&device_list_mutex);
354 list_for_each_entry(device, &device_list, dev_node) {
355 if (device->ib_device->node_guid == cma_id->device->node_guid) {
356 device->refcount++;
357 isert_info("Found iser device %p refcount %d\n",
358 device, device->refcount);
359 mutex_unlock(&device_list_mutex);
360 return device;
361 }
362 }
363
364 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
365 if (!device) {
366 mutex_unlock(&device_list_mutex);
367 return ERR_PTR(-ENOMEM);
368 }
369
370 INIT_LIST_HEAD(&device->dev_node);
371
372 device->ib_device = cma_id->device;
373 ret = isert_create_device_ib_res(device);
374 if (ret) {
375 kfree(device);
376 mutex_unlock(&device_list_mutex);
377 return ERR_PTR(ret);
378 }
379
380 device->refcount++;
381 list_add_tail(&device->dev_node, &device_list);
382 isert_info("Created a new iser device %p refcount %d\n",
383 device, device->refcount);
384 mutex_unlock(&device_list_mutex);
385
386 return device;
387 }
388
389 static void
390 isert_init_conn(struct isert_conn *isert_conn)
391 {
392 isert_conn->state = ISER_CONN_INIT;
393 INIT_LIST_HEAD(&isert_conn->node);
394 init_completion(&isert_conn->login_comp);
395 init_completion(&isert_conn->login_req_comp);
396 init_waitqueue_head(&isert_conn->rem_wait);
397 kref_init(&isert_conn->kref);
398 mutex_init(&isert_conn->mutex);
399 INIT_WORK(&isert_conn->release_work, isert_release_work);
400 }
401
402 static void
403 isert_free_login_buf(struct isert_conn *isert_conn)
404 {
405 struct ib_device *ib_dev = isert_conn->device->ib_device;
406
407 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
408 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
409 kfree(isert_conn->login_rsp_buf);
410
411 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
412 ISER_RX_PAYLOAD_SIZE,
413 DMA_FROM_DEVICE);
414 kfree(isert_conn->login_req_buf);
415 }
416
417 static int
418 isert_alloc_login_buf(struct isert_conn *isert_conn,
419 struct ib_device *ib_dev)
420 {
421 int ret;
422
423 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
424 GFP_KERNEL);
425 if (!isert_conn->login_req_buf)
426 return -ENOMEM;
427
428 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
429 isert_conn->login_req_buf,
430 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
431 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
432 if (ret) {
433 isert_err("login_req_dma mapping error: %d\n", ret);
434 isert_conn->login_req_dma = 0;
435 goto out_free_login_req_buf;
436 }
437
438 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
439 if (!isert_conn->login_rsp_buf) {
440 ret = -ENOMEM;
441 goto out_unmap_login_req_buf;
442 }
443
444 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
445 isert_conn->login_rsp_buf,
446 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
447 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
448 if (ret) {
449 isert_err("login_rsp_dma mapping error: %d\n", ret);
450 isert_conn->login_rsp_dma = 0;
451 goto out_free_login_rsp_buf;
452 }
453
454 return 0;
455
456 out_free_login_rsp_buf:
457 kfree(isert_conn->login_rsp_buf);
458 out_unmap_login_req_buf:
459 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
460 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
461 out_free_login_req_buf:
462 kfree(isert_conn->login_req_buf);
463 return ret;
464 }
465
466 static void
467 isert_set_nego_params(struct isert_conn *isert_conn,
468 struct rdma_conn_param *param)
469 {
470 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
471
472 /* Set max inflight RDMA READ requests */
473 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
474 attr->max_qp_init_rd_atom);
475 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
476
477 if (param->private_data) {
478 u8 flags = *(u8 *)param->private_data;
479
480 /*
481 * use remote invalidation if the both initiator
482 * and the HCA support it
483 */
484 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
485 (attr->device_cap_flags &
486 IB_DEVICE_MEM_MGT_EXTENSIONS);
487 if (isert_conn->snd_w_inv)
488 isert_info("Using remote invalidation\n");
489 }
490 }
491
492 static int
493 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
494 {
495 struct isert_np *isert_np = cma_id->context;
496 struct iscsi_np *np = isert_np->np;
497 struct isert_conn *isert_conn;
498 struct isert_device *device;
499 int ret = 0;
500
501 spin_lock_bh(&np->np_thread_lock);
502 if (!np->enabled) {
503 spin_unlock_bh(&np->np_thread_lock);
504 isert_dbg("iscsi_np is not enabled, reject connect request\n");
505 return rdma_reject(cma_id, NULL, 0);
506 }
507 spin_unlock_bh(&np->np_thread_lock);
508
509 isert_dbg("cma_id: %p, portal: %p\n",
510 cma_id, cma_id->context);
511
512 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
513 if (!isert_conn)
514 return -ENOMEM;
515
516 isert_init_conn(isert_conn);
517 isert_conn->cm_id = cma_id;
518
519 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
520 if (ret)
521 goto out;
522
523 device = isert_device_get(cma_id);
524 if (IS_ERR(device)) {
525 ret = PTR_ERR(device);
526 goto out_rsp_dma_map;
527 }
528 isert_conn->device = device;
529
530 isert_set_nego_params(isert_conn, &event->param.conn);
531
532 ret = isert_conn_setup_qp(isert_conn, cma_id);
533 if (ret)
534 goto out_conn_dev;
535
536 ret = isert_login_post_recv(isert_conn);
537 if (ret)
538 goto out_conn_dev;
539
540 ret = isert_rdma_accept(isert_conn);
541 if (ret)
542 goto out_conn_dev;
543
544 mutex_lock(&isert_np->mutex);
545 list_add_tail(&isert_conn->node, &isert_np->accepted);
546 mutex_unlock(&isert_np->mutex);
547
548 return 0;
549
550 out_conn_dev:
551 isert_device_put(device);
552 out_rsp_dma_map:
553 isert_free_login_buf(isert_conn);
554 out:
555 kfree(isert_conn);
556 rdma_reject(cma_id, NULL, 0);
557 return ret;
558 }
559
560 static void
561 isert_connect_release(struct isert_conn *isert_conn)
562 {
563 struct isert_device *device = isert_conn->device;
564
565 isert_dbg("conn %p\n", isert_conn);
566
567 BUG_ON(!device);
568
569 isert_free_rx_descriptors(isert_conn);
570 if (isert_conn->cm_id &&
571 !isert_conn->dev_removed)
572 rdma_destroy_id(isert_conn->cm_id);
573
574 if (isert_conn->qp) {
575 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
576
577 isert_comp_put(comp);
578 ib_destroy_qp(isert_conn->qp);
579 }
580
581 if (isert_conn->login_req_buf)
582 isert_free_login_buf(isert_conn);
583
584 isert_device_put(device);
585
586 if (isert_conn->dev_removed)
587 wake_up_interruptible(&isert_conn->rem_wait);
588 else
589 kfree(isert_conn);
590 }
591
592 static void
593 isert_connected_handler(struct rdma_cm_id *cma_id)
594 {
595 struct isert_conn *isert_conn = cma_id->qp->qp_context;
596 struct isert_np *isert_np = cma_id->context;
597
598 isert_info("conn %p\n", isert_conn);
599
600 mutex_lock(&isert_conn->mutex);
601 isert_conn->state = ISER_CONN_UP;
602 kref_get(&isert_conn->kref);
603 mutex_unlock(&isert_conn->mutex);
604
605 mutex_lock(&isert_np->mutex);
606 list_move_tail(&isert_conn->node, &isert_np->pending);
607 mutex_unlock(&isert_np->mutex);
608
609 isert_info("np %p: Allow accept_np to continue\n", isert_np);
610 up(&isert_np->sem);
611 }
612
613 static void
614 isert_release_kref(struct kref *kref)
615 {
616 struct isert_conn *isert_conn = container_of(kref,
617 struct isert_conn, kref);
618
619 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
620 current->pid);
621
622 isert_connect_release(isert_conn);
623 }
624
625 static void
626 isert_put_conn(struct isert_conn *isert_conn)
627 {
628 kref_put(&isert_conn->kref, isert_release_kref);
629 }
630
631 static void
632 isert_handle_unbound_conn(struct isert_conn *isert_conn)
633 {
634 struct isert_np *isert_np = isert_conn->cm_id->context;
635
636 mutex_lock(&isert_np->mutex);
637 if (!list_empty(&isert_conn->node)) {
638 /*
639 * This means iscsi doesn't know this connection
640 * so schedule a cleanup ourselves
641 */
642 list_del_init(&isert_conn->node);
643 isert_put_conn(isert_conn);
644 queue_work(isert_release_wq, &isert_conn->release_work);
645 }
646 mutex_unlock(&isert_np->mutex);
647 }
648
649 /**
650 * isert_conn_terminate() - Initiate connection termination
651 * @isert_conn: isert connection struct
652 *
653 * Notes:
654 * In case the connection state is BOUND, move state
655 * to TEMINATING and start teardown sequence (rdma_disconnect).
656 * In case the connection state is UP, complete flush as well.
657 *
658 * This routine must be called with mutex held. Thus it is
659 * safe to call multiple times.
660 */
661 static void
662 isert_conn_terminate(struct isert_conn *isert_conn)
663 {
664 int err;
665
666 if (isert_conn->state >= ISER_CONN_TERMINATING)
667 return;
668
669 isert_info("Terminating conn %p state %d\n",
670 isert_conn, isert_conn->state);
671 isert_conn->state = ISER_CONN_TERMINATING;
672 err = rdma_disconnect(isert_conn->cm_id);
673 if (err)
674 isert_warn("Failed rdma_disconnect isert_conn %p\n",
675 isert_conn);
676 }
677
678 static int
679 isert_np_cma_handler(struct isert_np *isert_np,
680 enum rdma_cm_event_type event)
681 {
682 isert_dbg("%s (%d): isert np %p\n",
683 rdma_event_msg(event), event, isert_np);
684
685 switch (event) {
686 case RDMA_CM_EVENT_DEVICE_REMOVAL:
687 isert_np->cm_id = NULL;
688 break;
689 case RDMA_CM_EVENT_ADDR_CHANGE:
690 isert_np->cm_id = isert_setup_id(isert_np);
691 if (IS_ERR(isert_np->cm_id)) {
692 isert_err("isert np %p setup id failed: %ld\n",
693 isert_np, PTR_ERR(isert_np->cm_id));
694 isert_np->cm_id = NULL;
695 }
696 break;
697 default:
698 isert_err("isert np %p Unexpected event %d\n",
699 isert_np, event);
700 }
701
702 return -1;
703 }
704
705 static int
706 isert_disconnected_handler(struct rdma_cm_id *cma_id,
707 enum rdma_cm_event_type event)
708 {
709 struct isert_conn *isert_conn = cma_id->qp->qp_context;
710
711 mutex_lock(&isert_conn->mutex);
712 switch (isert_conn->state) {
713 case ISER_CONN_TERMINATING:
714 break;
715 case ISER_CONN_UP:
716 isert_conn_terminate(isert_conn);
717 ib_drain_qp(isert_conn->qp);
718 isert_handle_unbound_conn(isert_conn);
719 break;
720 case ISER_CONN_BOUND:
721 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
722 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
723 break;
724 default:
725 isert_warn("conn %p terminating in state %d\n",
726 isert_conn, isert_conn->state);
727 }
728 mutex_unlock(&isert_conn->mutex);
729
730 return 0;
731 }
732
733 static int
734 isert_connect_error(struct rdma_cm_id *cma_id)
735 {
736 struct isert_conn *isert_conn = cma_id->qp->qp_context;
737
738 ib_drain_qp(isert_conn->qp);
739 list_del_init(&isert_conn->node);
740 isert_conn->cm_id = NULL;
741 isert_put_conn(isert_conn);
742
743 return -1;
744 }
745
746 static int
747 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
748 {
749 struct isert_np *isert_np = cma_id->context;
750 struct isert_conn *isert_conn;
751 int ret = 0;
752
753 isert_info("%s (%d): status %d id %p np %p\n",
754 rdma_event_msg(event->event), event->event,
755 event->status, cma_id, cma_id->context);
756
757 if (isert_np->cm_id == cma_id)
758 return isert_np_cma_handler(cma_id->context, event->event);
759
760 switch (event->event) {
761 case RDMA_CM_EVENT_CONNECT_REQUEST:
762 ret = isert_connect_request(cma_id, event);
763 if (ret)
764 isert_err("failed handle connect request %d\n", ret);
765 break;
766 case RDMA_CM_EVENT_ESTABLISHED:
767 isert_connected_handler(cma_id);
768 break;
769 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
770 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
771 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
772 ret = isert_disconnected_handler(cma_id, event->event);
773 break;
774 case RDMA_CM_EVENT_DEVICE_REMOVAL:
775 isert_conn = cma_id->qp->qp_context;
776 isert_conn->dev_removed = true;
777 isert_disconnected_handler(cma_id, event->event);
778 wait_event_interruptible(isert_conn->rem_wait,
779 isert_conn->state == ISER_CONN_DOWN);
780 kfree(isert_conn);
781 /*
782 * return non-zero from the callback to destroy
783 * the rdma cm id
784 */
785 return 1;
786 case RDMA_CM_EVENT_REJECTED:
787 isert_info("Connection rejected: %s\n",
788 rdma_reject_msg(cma_id, event->status));
789 /* fall through */
790 case RDMA_CM_EVENT_UNREACHABLE:
791 case RDMA_CM_EVENT_CONNECT_ERROR:
792 ret = isert_connect_error(cma_id);
793 break;
794 default:
795 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
796 break;
797 }
798
799 return ret;
800 }
801
802 static int
803 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
804 {
805 struct ib_recv_wr *rx_wr;
806 int i, ret;
807 struct iser_rx_desc *rx_desc;
808
809 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
810 rx_desc = &isert_conn->rx_descs[i];
811
812 rx_wr->wr_cqe = &rx_desc->rx_cqe;
813 rx_wr->sg_list = &rx_desc->rx_sg;
814 rx_wr->num_sge = 1;
815 rx_wr->next = rx_wr + 1;
816 rx_desc->in_use = false;
817 }
818 rx_wr--;
819 rx_wr->next = NULL; /* mark end of work requests list */
820
821 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
822 if (ret)
823 isert_err("ib_post_recv() failed with ret: %d\n", ret);
824
825 return ret;
826 }
827
828 static int
829 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
830 {
831 struct ib_recv_wr rx_wr;
832 int ret;
833
834 if (!rx_desc->in_use) {
835 /*
836 * if the descriptor is not in-use we already reposted it
837 * for recv, so just silently return
838 */
839 return 0;
840 }
841
842 rx_desc->in_use = false;
843 rx_wr.wr_cqe = &rx_desc->rx_cqe;
844 rx_wr.sg_list = &rx_desc->rx_sg;
845 rx_wr.num_sge = 1;
846 rx_wr.next = NULL;
847
848 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
849 if (ret)
850 isert_err("ib_post_recv() failed with ret: %d\n", ret);
851
852 return ret;
853 }
854
855 static int
856 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
857 {
858 struct ib_device *ib_dev = isert_conn->cm_id->device;
859 struct ib_send_wr send_wr;
860 int ret;
861
862 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
863 ISER_HEADERS_LEN, DMA_TO_DEVICE);
864
865 tx_desc->tx_cqe.done = isert_login_send_done;
866
867 send_wr.next = NULL;
868 send_wr.wr_cqe = &tx_desc->tx_cqe;
869 send_wr.sg_list = tx_desc->tx_sg;
870 send_wr.num_sge = tx_desc->num_sge;
871 send_wr.opcode = IB_WR_SEND;
872 send_wr.send_flags = IB_SEND_SIGNALED;
873
874 ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
875 if (ret)
876 isert_err("ib_post_send() failed, ret: %d\n", ret);
877
878 return ret;
879 }
880
881 static void
882 __isert_create_send_desc(struct isert_device *device,
883 struct iser_tx_desc *tx_desc)
884 {
885
886 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
887 tx_desc->iser_header.flags = ISCSI_CTRL;
888
889 tx_desc->num_sge = 1;
890
891 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
892 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
893 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
894 }
895 }
896
897 static void
898 isert_create_send_desc(struct isert_conn *isert_conn,
899 struct isert_cmd *isert_cmd,
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
905 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
906 ISER_HEADERS_LEN, DMA_TO_DEVICE);
907
908 __isert_create_send_desc(device, tx_desc);
909 }
910
911 static int
912 isert_init_tx_hdrs(struct isert_conn *isert_conn,
913 struct iser_tx_desc *tx_desc)
914 {
915 struct isert_device *device = isert_conn->device;
916 struct ib_device *ib_dev = device->ib_device;
917 u64 dma_addr;
918
919 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
920 ISER_HEADERS_LEN, DMA_TO_DEVICE);
921 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
922 isert_err("ib_dma_mapping_error() failed\n");
923 return -ENOMEM;
924 }
925
926 tx_desc->dma_addr = dma_addr;
927 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
928 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
929 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
930
931 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
932 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
933 tx_desc->tx_sg[0].lkey);
934
935 return 0;
936 }
937
938 static void
939 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
940 struct ib_send_wr *send_wr)
941 {
942 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
943
944 tx_desc->tx_cqe.done = isert_send_done;
945 send_wr->wr_cqe = &tx_desc->tx_cqe;
946
947 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
948 send_wr->opcode = IB_WR_SEND_WITH_INV;
949 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
950 } else {
951 send_wr->opcode = IB_WR_SEND;
952 }
953
954 send_wr->sg_list = &tx_desc->tx_sg[0];
955 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
956 send_wr->send_flags = IB_SEND_SIGNALED;
957 }
958
959 static int
960 isert_login_post_recv(struct isert_conn *isert_conn)
961 {
962 struct ib_recv_wr rx_wr;
963 struct ib_sge sge;
964 int ret;
965
966 memset(&sge, 0, sizeof(struct ib_sge));
967 sge.addr = isert_conn->login_req_dma;
968 sge.length = ISER_RX_PAYLOAD_SIZE;
969 sge.lkey = isert_conn->device->pd->local_dma_lkey;
970
971 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
972 sge.addr, sge.length, sge.lkey);
973
974 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
975
976 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
977 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
978 rx_wr.sg_list = &sge;
979 rx_wr.num_sge = 1;
980
981 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
982 if (ret)
983 isert_err("ib_post_recv() failed: %d\n", ret);
984
985 return ret;
986 }
987
988 static int
989 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
990 u32 length)
991 {
992 struct isert_conn *isert_conn = conn->context;
993 struct isert_device *device = isert_conn->device;
994 struct ib_device *ib_dev = device->ib_device;
995 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
996 int ret;
997
998 __isert_create_send_desc(device, tx_desc);
999
1000 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1001 sizeof(struct iscsi_hdr));
1002
1003 isert_init_tx_hdrs(isert_conn, tx_desc);
1004
1005 if (length > 0) {
1006 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1007
1008 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1009 length, DMA_TO_DEVICE);
1010
1011 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1012
1013 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1014 length, DMA_TO_DEVICE);
1015
1016 tx_dsg->addr = isert_conn->login_rsp_dma;
1017 tx_dsg->length = length;
1018 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1019 tx_desc->num_sge = 2;
1020 }
1021 if (!login->login_failed) {
1022 if (login->login_complete) {
1023 ret = isert_alloc_rx_descriptors(isert_conn);
1024 if (ret)
1025 return ret;
1026
1027 ret = isert_post_recvm(isert_conn,
1028 ISERT_QP_MAX_RECV_DTOS);
1029 if (ret)
1030 return ret;
1031
1032 /* Now we are in FULL_FEATURE phase */
1033 mutex_lock(&isert_conn->mutex);
1034 isert_conn->state = ISER_CONN_FULL_FEATURE;
1035 mutex_unlock(&isert_conn->mutex);
1036 goto post_send;
1037 }
1038
1039 ret = isert_login_post_recv(isert_conn);
1040 if (ret)
1041 return ret;
1042 }
1043 post_send:
1044 ret = isert_login_post_send(isert_conn, tx_desc);
1045 if (ret)
1046 return ret;
1047
1048 return 0;
1049 }
1050
1051 static void
1052 isert_rx_login_req(struct isert_conn *isert_conn)
1053 {
1054 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1055 int rx_buflen = isert_conn->login_req_len;
1056 struct iscsi_conn *conn = isert_conn->conn;
1057 struct iscsi_login *login = conn->conn_login;
1058 int size;
1059
1060 isert_info("conn %p\n", isert_conn);
1061
1062 WARN_ON_ONCE(!login);
1063
1064 if (login->first_request) {
1065 struct iscsi_login_req *login_req =
1066 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1067 /*
1068 * Setup the initial iscsi_login values from the leading
1069 * login request PDU.
1070 */
1071 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1072 login->current_stage =
1073 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1074 >> 2;
1075 login->version_min = login_req->min_version;
1076 login->version_max = login_req->max_version;
1077 memcpy(login->isid, login_req->isid, 6);
1078 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1079 login->init_task_tag = login_req->itt;
1080 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1081 login->cid = be16_to_cpu(login_req->cid);
1082 login->tsih = be16_to_cpu(login_req->tsih);
1083 }
1084
1085 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1086
1087 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1088 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1089 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1090 MAX_KEY_VALUE_PAIRS);
1091 memcpy(login->req_buf, &rx_desc->data[0], size);
1092
1093 if (login->first_request) {
1094 complete(&isert_conn->login_comp);
1095 return;
1096 }
1097 schedule_delayed_work(&conn->login_work, 0);
1098 }
1099
1100 static struct iscsi_cmd
1101 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1102 {
1103 struct isert_conn *isert_conn = conn->context;
1104 struct isert_cmd *isert_cmd;
1105 struct iscsi_cmd *cmd;
1106
1107 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1108 if (!cmd) {
1109 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1110 return NULL;
1111 }
1112 isert_cmd = iscsit_priv_cmd(cmd);
1113 isert_cmd->conn = isert_conn;
1114 isert_cmd->iscsi_cmd = cmd;
1115 isert_cmd->rx_desc = rx_desc;
1116
1117 return cmd;
1118 }
1119
1120 static int
1121 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1122 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1123 struct iser_rx_desc *rx_desc, unsigned char *buf)
1124 {
1125 struct iscsi_conn *conn = isert_conn->conn;
1126 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1127 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1128 bool dump_payload = false;
1129 unsigned int data_len;
1130
1131 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1132 if (rc < 0)
1133 return rc;
1134
1135 imm_data = cmd->immediate_data;
1136 imm_data_len = cmd->first_burst_len;
1137 unsol_data = cmd->unsolicited_data;
1138 data_len = cmd->se_cmd.data_length;
1139
1140 if (imm_data && imm_data_len == data_len)
1141 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1142 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1143 if (rc < 0) {
1144 return 0;
1145 } else if (rc > 0) {
1146 dump_payload = true;
1147 goto sequence_cmd;
1148 }
1149
1150 if (!imm_data)
1151 return 0;
1152
1153 if (imm_data_len != data_len) {
1154 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1155 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1156 &rx_desc->data[0], imm_data_len);
1157 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1158 sg_nents, imm_data_len);
1159 } else {
1160 sg_init_table(&isert_cmd->sg, 1);
1161 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1162 cmd->se_cmd.t_data_nents = 1;
1163 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1164 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1165 imm_data_len);
1166 }
1167
1168 cmd->write_data_done += imm_data_len;
1169
1170 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1171 spin_lock_bh(&cmd->istate_lock);
1172 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1173 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1174 spin_unlock_bh(&cmd->istate_lock);
1175 }
1176
1177 sequence_cmd:
1178 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1179
1180 if (!rc && dump_payload == false && unsol_data)
1181 iscsit_set_unsolicited_dataout(cmd);
1182 else if (dump_payload && imm_data)
1183 target_put_sess_cmd(&cmd->se_cmd);
1184
1185 return 0;
1186 }
1187
1188 static int
1189 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1190 struct iser_rx_desc *rx_desc, unsigned char *buf)
1191 {
1192 struct scatterlist *sg_start;
1193 struct iscsi_conn *conn = isert_conn->conn;
1194 struct iscsi_cmd *cmd = NULL;
1195 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1196 u32 unsol_data_len = ntoh24(hdr->dlength);
1197 int rc, sg_nents, sg_off, page_off;
1198
1199 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1200 if (rc < 0)
1201 return rc;
1202 else if (!cmd)
1203 return 0;
1204 /*
1205 * FIXME: Unexpected unsolicited_data out
1206 */
1207 if (!cmd->unsolicited_data) {
1208 isert_err("Received unexpected solicited data payload\n");
1209 dump_stack();
1210 return -1;
1211 }
1212
1213 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1214 "write_data_done: %u, data_length: %u\n",
1215 unsol_data_len, cmd->write_data_done,
1216 cmd->se_cmd.data_length);
1217
1218 sg_off = cmd->write_data_done / PAGE_SIZE;
1219 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1220 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1221 page_off = cmd->write_data_done % PAGE_SIZE;
1222 /*
1223 * FIXME: Non page-aligned unsolicited_data out
1224 */
1225 if (page_off) {
1226 isert_err("unexpected non-page aligned data payload\n");
1227 dump_stack();
1228 return -1;
1229 }
1230 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1231 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1232 sg_nents, &rx_desc->data[0], unsol_data_len);
1233
1234 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1235 unsol_data_len);
1236
1237 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1238 if (rc < 0)
1239 return rc;
1240
1241 /*
1242 * multiple data-outs on the same command can arrive -
1243 * so post the buffer before hand
1244 */
1245 rc = isert_post_recv(isert_conn, rx_desc);
1246 if (rc) {
1247 isert_err("ib_post_recv failed with %d\n", rc);
1248 return rc;
1249 }
1250 return 0;
1251 }
1252
1253 static int
1254 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1255 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1256 unsigned char *buf)
1257 {
1258 struct iscsi_conn *conn = isert_conn->conn;
1259 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1260 int rc;
1261
1262 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1263 if (rc < 0)
1264 return rc;
1265 /*
1266 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1267 */
1268
1269 return iscsit_process_nop_out(conn, cmd, hdr);
1270 }
1271
1272 static int
1273 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1274 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1275 struct iscsi_text *hdr)
1276 {
1277 struct iscsi_conn *conn = isert_conn->conn;
1278 u32 payload_length = ntoh24(hdr->dlength);
1279 int rc;
1280 unsigned char *text_in = NULL;
1281
1282 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1283 if (rc < 0)
1284 return rc;
1285
1286 if (payload_length) {
1287 text_in = kzalloc(payload_length, GFP_KERNEL);
1288 if (!text_in)
1289 return -ENOMEM;
1290 }
1291 cmd->text_in_ptr = text_in;
1292
1293 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1294
1295 return iscsit_process_text_cmd(conn, cmd, hdr);
1296 }
1297
1298 static int
1299 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1300 uint32_t read_stag, uint64_t read_va,
1301 uint32_t write_stag, uint64_t write_va)
1302 {
1303 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1304 struct iscsi_conn *conn = isert_conn->conn;
1305 struct iscsi_cmd *cmd;
1306 struct isert_cmd *isert_cmd;
1307 int ret = -EINVAL;
1308 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1309
1310 if (conn->sess->sess_ops->SessionType &&
1311 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1312 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1313 " ignoring\n", opcode);
1314 return 0;
1315 }
1316
1317 switch (opcode) {
1318 case ISCSI_OP_SCSI_CMD:
1319 cmd = isert_allocate_cmd(conn, rx_desc);
1320 if (!cmd)
1321 break;
1322
1323 isert_cmd = iscsit_priv_cmd(cmd);
1324 isert_cmd->read_stag = read_stag;
1325 isert_cmd->read_va = read_va;
1326 isert_cmd->write_stag = write_stag;
1327 isert_cmd->write_va = write_va;
1328 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1329
1330 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1331 rx_desc, (unsigned char *)hdr);
1332 break;
1333 case ISCSI_OP_NOOP_OUT:
1334 cmd = isert_allocate_cmd(conn, rx_desc);
1335 if (!cmd)
1336 break;
1337
1338 isert_cmd = iscsit_priv_cmd(cmd);
1339 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1340 rx_desc, (unsigned char *)hdr);
1341 break;
1342 case ISCSI_OP_SCSI_DATA_OUT:
1343 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1344 (unsigned char *)hdr);
1345 break;
1346 case ISCSI_OP_SCSI_TMFUNC:
1347 cmd = isert_allocate_cmd(conn, rx_desc);
1348 if (!cmd)
1349 break;
1350
1351 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1352 (unsigned char *)hdr);
1353 break;
1354 case ISCSI_OP_LOGOUT:
1355 cmd = isert_allocate_cmd(conn, rx_desc);
1356 if (!cmd)
1357 break;
1358
1359 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1360 break;
1361 case ISCSI_OP_TEXT:
1362 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1363 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1364 else
1365 cmd = isert_allocate_cmd(conn, rx_desc);
1366
1367 if (!cmd)
1368 break;
1369
1370 isert_cmd = iscsit_priv_cmd(cmd);
1371 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1372 rx_desc, (struct iscsi_text *)hdr);
1373 break;
1374 default:
1375 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1376 dump_stack();
1377 break;
1378 }
1379
1380 return ret;
1381 }
1382
1383 static void
1384 isert_print_wc(struct ib_wc *wc, const char *type)
1385 {
1386 if (wc->status != IB_WC_WR_FLUSH_ERR)
1387 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1388 ib_wc_status_msg(wc->status), wc->status,
1389 wc->vendor_err);
1390 else
1391 isert_dbg("%s failure: %s (%d)\n", type,
1392 ib_wc_status_msg(wc->status), wc->status);
1393 }
1394
1395 static void
1396 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1397 {
1398 struct isert_conn *isert_conn = wc->qp->qp_context;
1399 struct ib_device *ib_dev = isert_conn->cm_id->device;
1400 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1401 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1402 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1403 uint64_t read_va = 0, write_va = 0;
1404 uint32_t read_stag = 0, write_stag = 0;
1405
1406 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1407 isert_print_wc(wc, "recv");
1408 if (wc->status != IB_WC_WR_FLUSH_ERR)
1409 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1410 return;
1411 }
1412
1413 rx_desc->in_use = true;
1414
1415 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1416 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1417
1418 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1419 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1420 (int)(wc->byte_len - ISER_HEADERS_LEN));
1421
1422 switch (iser_ctrl->flags & 0xF0) {
1423 case ISCSI_CTRL:
1424 if (iser_ctrl->flags & ISER_RSV) {
1425 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1426 read_va = be64_to_cpu(iser_ctrl->read_va);
1427 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1428 read_stag, (unsigned long long)read_va);
1429 }
1430 if (iser_ctrl->flags & ISER_WSV) {
1431 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1432 write_va = be64_to_cpu(iser_ctrl->write_va);
1433 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1434 write_stag, (unsigned long long)write_va);
1435 }
1436
1437 isert_dbg("ISER ISCSI_CTRL PDU\n");
1438 break;
1439 case ISER_HELLO:
1440 isert_err("iSER Hello message\n");
1441 break;
1442 default:
1443 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1444 break;
1445 }
1446
1447 isert_rx_opcode(isert_conn, rx_desc,
1448 read_stag, read_va, write_stag, write_va);
1449
1450 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1451 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1452 }
1453
1454 static void
1455 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1456 {
1457 struct isert_conn *isert_conn = wc->qp->qp_context;
1458 struct ib_device *ib_dev = isert_conn->device->ib_device;
1459
1460 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1461 isert_print_wc(wc, "login recv");
1462 return;
1463 }
1464
1465 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1466 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1467
1468 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1469
1470 if (isert_conn->conn) {
1471 struct iscsi_login *login = isert_conn->conn->conn_login;
1472
1473 if (login && !login->first_request)
1474 isert_rx_login_req(isert_conn);
1475 }
1476
1477 mutex_lock(&isert_conn->mutex);
1478 complete(&isert_conn->login_req_comp);
1479 mutex_unlock(&isert_conn->mutex);
1480
1481 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1482 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1483 }
1484
1485 static void
1486 isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1487 {
1488 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1489 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1490
1491 if (!cmd->rw.nr_ops)
1492 return;
1493
1494 if (isert_prot_cmd(conn, se_cmd)) {
1495 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1496 conn->cm_id->port_num, se_cmd->t_data_sg,
1497 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1498 se_cmd->t_prot_nents, dir);
1499 } else {
1500 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1501 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1502 }
1503
1504 cmd->rw.nr_ops = 0;
1505 }
1506
1507 static void
1508 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1509 {
1510 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1511 struct isert_conn *isert_conn = isert_cmd->conn;
1512 struct iscsi_conn *conn = isert_conn->conn;
1513 struct iscsi_text_rsp *hdr;
1514
1515 isert_dbg("Cmd %p\n", isert_cmd);
1516
1517 switch (cmd->iscsi_opcode) {
1518 case ISCSI_OP_SCSI_CMD:
1519 spin_lock_bh(&conn->cmd_lock);
1520 if (!list_empty(&cmd->i_conn_node))
1521 list_del_init(&cmd->i_conn_node);
1522 spin_unlock_bh(&conn->cmd_lock);
1523
1524 if (cmd->data_direction == DMA_TO_DEVICE) {
1525 iscsit_stop_dataout_timer(cmd);
1526 /*
1527 * Check for special case during comp_err where
1528 * WRITE_PENDING has been handed off from core,
1529 * but requires an extra target_put_sess_cmd()
1530 * before transport_generic_free_cmd() below.
1531 */
1532 if (comp_err &&
1533 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1534 struct se_cmd *se_cmd = &cmd->se_cmd;
1535
1536 target_put_sess_cmd(se_cmd);
1537 }
1538 }
1539
1540 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1541 transport_generic_free_cmd(&cmd->se_cmd, 0);
1542 break;
1543 case ISCSI_OP_SCSI_TMFUNC:
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 transport_generic_free_cmd(&cmd->se_cmd, 0);
1550 break;
1551 case ISCSI_OP_REJECT:
1552 case ISCSI_OP_NOOP_OUT:
1553 case ISCSI_OP_TEXT:
1554 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1555 /* If the continue bit is on, keep the command alive */
1556 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1557 break;
1558
1559 spin_lock_bh(&conn->cmd_lock);
1560 if (!list_empty(&cmd->i_conn_node))
1561 list_del_init(&cmd->i_conn_node);
1562 spin_unlock_bh(&conn->cmd_lock);
1563
1564 /*
1565 * Handle special case for REJECT when iscsi_add_reject*() has
1566 * overwritten the original iscsi_opcode assignment, and the
1567 * associated cmd->se_cmd needs to be released.
1568 */
1569 if (cmd->se_cmd.se_tfo != NULL) {
1570 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1571 cmd->iscsi_opcode);
1572 transport_generic_free_cmd(&cmd->se_cmd, 0);
1573 break;
1574 }
1575 /* fall through */
1576 default:
1577 iscsit_release_cmd(cmd);
1578 break;
1579 }
1580 }
1581
1582 static void
1583 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1584 {
1585 if (tx_desc->dma_addr != 0) {
1586 isert_dbg("unmap single for tx_desc->dma_addr\n");
1587 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1588 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1589 tx_desc->dma_addr = 0;
1590 }
1591 }
1592
1593 static void
1594 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1595 struct ib_device *ib_dev, bool comp_err)
1596 {
1597 if (isert_cmd->pdu_buf_dma != 0) {
1598 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1599 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1600 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1601 isert_cmd->pdu_buf_dma = 0;
1602 }
1603
1604 isert_unmap_tx_desc(tx_desc, ib_dev);
1605 isert_put_cmd(isert_cmd, comp_err);
1606 }
1607
1608 static int
1609 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1610 {
1611 struct ib_mr_status mr_status;
1612 int ret;
1613
1614 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1615 if (ret) {
1616 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1617 goto fail_mr_status;
1618 }
1619
1620 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1621 u64 sec_offset_err;
1622 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1623
1624 switch (mr_status.sig_err.err_type) {
1625 case IB_SIG_BAD_GUARD:
1626 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1627 break;
1628 case IB_SIG_BAD_REFTAG:
1629 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1630 break;
1631 case IB_SIG_BAD_APPTAG:
1632 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1633 break;
1634 }
1635 sec_offset_err = mr_status.sig_err.sig_err_offset;
1636 do_div(sec_offset_err, block_size);
1637 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1638
1639 isert_err("PI error found type %d at sector 0x%llx "
1640 "expected 0x%x vs actual 0x%x\n",
1641 mr_status.sig_err.err_type,
1642 (unsigned long long)se_cmd->bad_sector,
1643 mr_status.sig_err.expected,
1644 mr_status.sig_err.actual);
1645 ret = 1;
1646 }
1647
1648 fail_mr_status:
1649 return ret;
1650 }
1651
1652 static void
1653 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1654 {
1655 struct isert_conn *isert_conn = wc->qp->qp_context;
1656 struct isert_device *device = isert_conn->device;
1657 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1658 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1659 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1660 int ret = 0;
1661
1662 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1663 isert_print_wc(wc, "rdma write");
1664 if (wc->status != IB_WC_WR_FLUSH_ERR)
1665 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1666 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1667 return;
1668 }
1669
1670 isert_dbg("Cmd %p\n", isert_cmd);
1671
1672 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1673 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1674
1675 if (ret) {
1676 /*
1677 * transport_generic_request_failure() expects to have
1678 * plus two references to handle queue-full, so re-add
1679 * one here as target-core will have already dropped
1680 * it after the first isert_put_datain() callback.
1681 */
1682 kref_get(&cmd->cmd_kref);
1683 transport_generic_request_failure(cmd, cmd->pi_err);
1684 } else {
1685 /*
1686 * XXX: isert_put_response() failure is not retried.
1687 */
1688 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1689 if (ret)
1690 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1691 }
1692 }
1693
1694 static void
1695 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1696 {
1697 struct isert_conn *isert_conn = wc->qp->qp_context;
1698 struct isert_device *device = isert_conn->device;
1699 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1700 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1701 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1702 struct se_cmd *se_cmd = &cmd->se_cmd;
1703 int ret = 0;
1704
1705 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1706 isert_print_wc(wc, "rdma read");
1707 if (wc->status != IB_WC_WR_FLUSH_ERR)
1708 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1709 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1710 return;
1711 }
1712
1713 isert_dbg("Cmd %p\n", isert_cmd);
1714
1715 iscsit_stop_dataout_timer(cmd);
1716
1717 if (isert_prot_cmd(isert_conn, se_cmd))
1718 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1719 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1720 cmd->write_data_done = 0;
1721
1722 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1723 spin_lock_bh(&cmd->istate_lock);
1724 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1725 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1726 spin_unlock_bh(&cmd->istate_lock);
1727
1728 /*
1729 * transport_generic_request_failure() will drop the extra
1730 * se_cmd->cmd_kref reference after T10-PI error, and handle
1731 * any non-zero ->queue_status() callback error retries.
1732 */
1733 if (ret)
1734 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1735 else
1736 target_execute_cmd(se_cmd);
1737 }
1738
1739 static void
1740 isert_do_control_comp(struct work_struct *work)
1741 {
1742 struct isert_cmd *isert_cmd = container_of(work,
1743 struct isert_cmd, comp_work);
1744 struct isert_conn *isert_conn = isert_cmd->conn;
1745 struct ib_device *ib_dev = isert_conn->cm_id->device;
1746 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1747
1748 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1749
1750 switch (cmd->i_state) {
1751 case ISTATE_SEND_TASKMGTRSP:
1752 iscsit_tmr_post_handler(cmd, cmd->conn);
1753 /* fall through */
1754 case ISTATE_SEND_REJECT:
1755 case ISTATE_SEND_TEXTRSP:
1756 cmd->i_state = ISTATE_SENT_STATUS;
1757 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1758 ib_dev, false);
1759 break;
1760 case ISTATE_SEND_LOGOUTRSP:
1761 iscsit_logout_post_handler(cmd, cmd->conn);
1762 break;
1763 default:
1764 isert_err("Unknown i_state %d\n", cmd->i_state);
1765 dump_stack();
1766 break;
1767 }
1768 }
1769
1770 static void
1771 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1772 {
1773 struct isert_conn *isert_conn = wc->qp->qp_context;
1774 struct ib_device *ib_dev = isert_conn->cm_id->device;
1775 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1776
1777 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1778 isert_print_wc(wc, "login send");
1779 if (wc->status != IB_WC_WR_FLUSH_ERR)
1780 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1781 }
1782
1783 isert_unmap_tx_desc(tx_desc, ib_dev);
1784 }
1785
1786 static void
1787 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1788 {
1789 struct isert_conn *isert_conn = wc->qp->qp_context;
1790 struct ib_device *ib_dev = isert_conn->cm_id->device;
1791 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1792 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1793
1794 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1795 isert_print_wc(wc, "send");
1796 if (wc->status != IB_WC_WR_FLUSH_ERR)
1797 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1798 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1799 return;
1800 }
1801
1802 isert_dbg("Cmd %p\n", isert_cmd);
1803
1804 switch (isert_cmd->iscsi_cmd->i_state) {
1805 case ISTATE_SEND_TASKMGTRSP:
1806 case ISTATE_SEND_LOGOUTRSP:
1807 case ISTATE_SEND_REJECT:
1808 case ISTATE_SEND_TEXTRSP:
1809 isert_unmap_tx_desc(tx_desc, ib_dev);
1810
1811 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1812 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1813 return;
1814 default:
1815 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1816 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1817 break;
1818 }
1819 }
1820
1821 static int
1822 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1823 {
1824 int ret;
1825
1826 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1827 if (ret) {
1828 isert_err("ib_post_recv failed with %d\n", ret);
1829 return ret;
1830 }
1831
1832 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1833 if (ret) {
1834 isert_err("ib_post_send failed with %d\n", ret);
1835 return ret;
1836 }
1837 return ret;
1838 }
1839
1840 static int
1841 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1842 {
1843 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1844 struct isert_conn *isert_conn = conn->context;
1845 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1846 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1847 &isert_cmd->tx_desc.iscsi_header;
1848
1849 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1850 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1851 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1852 /*
1853 * Attach SENSE DATA payload to iSCSI Response PDU
1854 */
1855 if (cmd->se_cmd.sense_buffer &&
1856 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1857 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1858 struct isert_device *device = isert_conn->device;
1859 struct ib_device *ib_dev = device->ib_device;
1860 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1861 u32 padding, pdu_len;
1862
1863 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1864 cmd->sense_buffer);
1865 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1866
1867 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1868 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1869 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1870
1871 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1872 (void *)cmd->sense_buffer, pdu_len,
1873 DMA_TO_DEVICE);
1874 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1875 return -ENOMEM;
1876
1877 isert_cmd->pdu_buf_len = pdu_len;
1878 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1879 tx_dsg->length = pdu_len;
1880 tx_dsg->lkey = device->pd->local_dma_lkey;
1881 isert_cmd->tx_desc.num_sge = 2;
1882 }
1883
1884 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1885
1886 isert_dbg("Posting SCSI Response\n");
1887
1888 return isert_post_response(isert_conn, isert_cmd);
1889 }
1890
1891 static void
1892 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1893 {
1894 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1895 struct isert_conn *isert_conn = conn->context;
1896
1897 spin_lock_bh(&conn->cmd_lock);
1898 if (!list_empty(&cmd->i_conn_node))
1899 list_del_init(&cmd->i_conn_node);
1900 spin_unlock_bh(&conn->cmd_lock);
1901
1902 if (cmd->data_direction == DMA_TO_DEVICE)
1903 iscsit_stop_dataout_timer(cmd);
1904 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1905 }
1906
1907 static enum target_prot_op
1908 isert_get_sup_prot_ops(struct iscsi_conn *conn)
1909 {
1910 struct isert_conn *isert_conn = conn->context;
1911 struct isert_device *device = isert_conn->device;
1912
1913 if (conn->tpg->tpg_attrib.t10_pi) {
1914 if (device->pi_capable) {
1915 isert_info("conn %p PI offload enabled\n", isert_conn);
1916 isert_conn->pi_support = true;
1917 return TARGET_PROT_ALL;
1918 }
1919 }
1920
1921 isert_info("conn %p PI offload disabled\n", isert_conn);
1922 isert_conn->pi_support = false;
1923
1924 return TARGET_PROT_NORMAL;
1925 }
1926
1927 static int
1928 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1929 bool nopout_response)
1930 {
1931 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1932 struct isert_conn *isert_conn = conn->context;
1933 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1934
1935 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1936 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1937 &isert_cmd->tx_desc.iscsi_header,
1938 nopout_response);
1939 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1940 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1941
1942 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1943
1944 return isert_post_response(isert_conn, isert_cmd);
1945 }
1946
1947 static int
1948 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1949 {
1950 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1951 struct isert_conn *isert_conn = conn->context;
1952 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1953
1954 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1955 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1956 &isert_cmd->tx_desc.iscsi_header);
1957 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1958 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1959
1960 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1961
1962 return isert_post_response(isert_conn, isert_cmd);
1963 }
1964
1965 static int
1966 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1967 {
1968 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1969 struct isert_conn *isert_conn = conn->context;
1970 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1971
1972 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1973 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1974 &isert_cmd->tx_desc.iscsi_header);
1975 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1976 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1977
1978 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1979
1980 return isert_post_response(isert_conn, isert_cmd);
1981 }
1982
1983 static int
1984 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1985 {
1986 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1987 struct isert_conn *isert_conn = conn->context;
1988 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1989 struct isert_device *device = isert_conn->device;
1990 struct ib_device *ib_dev = device->ib_device;
1991 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1992 struct iscsi_reject *hdr =
1993 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1994
1995 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1996 iscsit_build_reject(cmd, conn, hdr);
1997 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1998
1999 hton24(hdr->dlength, ISCSI_HDR_LEN);
2000 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2001 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2002 DMA_TO_DEVICE);
2003 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2004 return -ENOMEM;
2005 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2006 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2007 tx_dsg->length = ISCSI_HDR_LEN;
2008 tx_dsg->lkey = device->pd->local_dma_lkey;
2009 isert_cmd->tx_desc.num_sge = 2;
2010
2011 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2012
2013 isert_dbg("conn %p Posting Reject\n", isert_conn);
2014
2015 return isert_post_response(isert_conn, isert_cmd);
2016 }
2017
2018 static int
2019 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2020 {
2021 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2022 struct isert_conn *isert_conn = conn->context;
2023 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2024 struct iscsi_text_rsp *hdr =
2025 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2026 u32 txt_rsp_len;
2027 int rc;
2028
2029 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2030 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2031 if (rc < 0)
2032 return rc;
2033
2034 txt_rsp_len = rc;
2035 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2036
2037 if (txt_rsp_len) {
2038 struct isert_device *device = isert_conn->device;
2039 struct ib_device *ib_dev = device->ib_device;
2040 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2041 void *txt_rsp_buf = cmd->buf_ptr;
2042
2043 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2044 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2045 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2046 return -ENOMEM;
2047
2048 isert_cmd->pdu_buf_len = txt_rsp_len;
2049 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2050 tx_dsg->length = txt_rsp_len;
2051 tx_dsg->lkey = device->pd->local_dma_lkey;
2052 isert_cmd->tx_desc.num_sge = 2;
2053 }
2054 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2055
2056 isert_dbg("conn %p Text Response\n", isert_conn);
2057
2058 return isert_post_response(isert_conn, isert_cmd);
2059 }
2060
2061 static inline void
2062 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2063 struct ib_sig_domain *domain)
2064 {
2065 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2066 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2067 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2068 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2069 /*
2070 * At the moment we hard code those, but if in the future
2071 * the target core would like to use it, we will take it
2072 * from se_cmd.
2073 */
2074 domain->sig.dif.apptag_check_mask = 0xffff;
2075 domain->sig.dif.app_escape = true;
2076 domain->sig.dif.ref_escape = true;
2077 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2078 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2079 domain->sig.dif.ref_remap = true;
2080 };
2081
2082 static int
2083 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2084 {
2085 memset(sig_attrs, 0, sizeof(*sig_attrs));
2086
2087 switch (se_cmd->prot_op) {
2088 case TARGET_PROT_DIN_INSERT:
2089 case TARGET_PROT_DOUT_STRIP:
2090 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2091 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2092 break;
2093 case TARGET_PROT_DOUT_INSERT:
2094 case TARGET_PROT_DIN_STRIP:
2095 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2096 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2097 break;
2098 case TARGET_PROT_DIN_PASS:
2099 case TARGET_PROT_DOUT_PASS:
2100 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2101 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2102 break;
2103 default:
2104 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2105 return -EINVAL;
2106 }
2107
2108 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2109 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2110 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2111 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2112 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2113 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2114
2115 return 0;
2116 }
2117
2118 static int
2119 isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2120 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2121 {
2122 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2123 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2124 u8 port_num = conn->cm_id->port_num;
2125 u64 addr;
2126 u32 rkey, offset;
2127 int ret;
2128
2129 if (cmd->ctx_init_done)
2130 goto rdma_ctx_post;
2131
2132 if (dir == DMA_FROM_DEVICE) {
2133 addr = cmd->write_va;
2134 rkey = cmd->write_stag;
2135 offset = cmd->iscsi_cmd->write_data_done;
2136 } else {
2137 addr = cmd->read_va;
2138 rkey = cmd->read_stag;
2139 offset = 0;
2140 }
2141
2142 if (isert_prot_cmd(conn, se_cmd)) {
2143 struct ib_sig_attrs sig_attrs;
2144
2145 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2146 if (ret)
2147 return ret;
2148
2149 WARN_ON_ONCE(offset);
2150 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2151 se_cmd->t_data_sg, se_cmd->t_data_nents,
2152 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2153 &sig_attrs, addr, rkey, dir);
2154 } else {
2155 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2156 se_cmd->t_data_sg, se_cmd->t_data_nents,
2157 offset, addr, rkey, dir);
2158 }
2159
2160 if (ret < 0) {
2161 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2162 return ret;
2163 }
2164
2165 cmd->ctx_init_done = true;
2166
2167 rdma_ctx_post:
2168 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2169 if (ret < 0)
2170 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2171 return ret;
2172 }
2173
2174 static int
2175 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2176 {
2177 struct se_cmd *se_cmd = &cmd->se_cmd;
2178 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2179 struct isert_conn *isert_conn = conn->context;
2180 struct ib_cqe *cqe = NULL;
2181 struct ib_send_wr *chain_wr = NULL;
2182 int rc;
2183
2184 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2185 isert_cmd, se_cmd->data_length);
2186
2187 if (isert_prot_cmd(isert_conn, se_cmd)) {
2188 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2189 cqe = &isert_cmd->tx_desc.tx_cqe;
2190 } else {
2191 /*
2192 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2193 */
2194 isert_create_send_desc(isert_conn, isert_cmd,
2195 &isert_cmd->tx_desc);
2196 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2197 &isert_cmd->tx_desc.iscsi_header);
2198 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2199 isert_init_send_wr(isert_conn, isert_cmd,
2200 &isert_cmd->tx_desc.send_wr);
2201
2202 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2203 if (rc) {
2204 isert_err("ib_post_recv failed with %d\n", rc);
2205 return rc;
2206 }
2207
2208 chain_wr = &isert_cmd->tx_desc.send_wr;
2209 }
2210
2211 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2212 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2213 isert_cmd, rc);
2214 return rc;
2215 }
2216
2217 static int
2218 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2219 {
2220 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2221 int ret;
2222
2223 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2224 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2225
2226 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2227 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2228 &isert_cmd->tx_desc.tx_cqe, NULL);
2229
2230 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2231 isert_cmd, ret);
2232 return ret;
2233 }
2234
2235 static int
2236 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2237 {
2238 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2239 int ret = 0;
2240
2241 switch (state) {
2242 case ISTATE_REMOVE:
2243 spin_lock_bh(&conn->cmd_lock);
2244 list_del_init(&cmd->i_conn_node);
2245 spin_unlock_bh(&conn->cmd_lock);
2246 isert_put_cmd(isert_cmd, true);
2247 break;
2248 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2249 ret = isert_put_nopin(cmd, conn, false);
2250 break;
2251 default:
2252 isert_err("Unknown immediate state: 0x%02x\n", state);
2253 ret = -EINVAL;
2254 break;
2255 }
2256
2257 return ret;
2258 }
2259
2260 static int
2261 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2262 {
2263 struct isert_conn *isert_conn = conn->context;
2264 int ret;
2265
2266 switch (state) {
2267 case ISTATE_SEND_LOGOUTRSP:
2268 ret = isert_put_logout_rsp(cmd, conn);
2269 if (!ret)
2270 isert_conn->logout_posted = true;
2271 break;
2272 case ISTATE_SEND_NOPIN:
2273 ret = isert_put_nopin(cmd, conn, true);
2274 break;
2275 case ISTATE_SEND_TASKMGTRSP:
2276 ret = isert_put_tm_rsp(cmd, conn);
2277 break;
2278 case ISTATE_SEND_REJECT:
2279 ret = isert_put_reject(cmd, conn);
2280 break;
2281 case ISTATE_SEND_TEXTRSP:
2282 ret = isert_put_text_rsp(cmd, conn);
2283 break;
2284 case ISTATE_SEND_STATUS:
2285 /*
2286 * Special case for sending non GOOD SCSI status from TX thread
2287 * context during pre se_cmd excecution failure.
2288 */
2289 ret = isert_put_response(conn, cmd);
2290 break;
2291 default:
2292 isert_err("Unknown response state: 0x%02x\n", state);
2293 ret = -EINVAL;
2294 break;
2295 }
2296
2297 return ret;
2298 }
2299
2300 struct rdma_cm_id *
2301 isert_setup_id(struct isert_np *isert_np)
2302 {
2303 struct iscsi_np *np = isert_np->np;
2304 struct rdma_cm_id *id;
2305 struct sockaddr *sa;
2306 int ret;
2307
2308 sa = (struct sockaddr *)&np->np_sockaddr;
2309 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2310
2311 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2312 RDMA_PS_TCP, IB_QPT_RC);
2313 if (IS_ERR(id)) {
2314 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2315 ret = PTR_ERR(id);
2316 goto out;
2317 }
2318 isert_dbg("id %p context %p\n", id, id->context);
2319
2320 ret = rdma_bind_addr(id, sa);
2321 if (ret) {
2322 isert_err("rdma_bind_addr() failed: %d\n", ret);
2323 goto out_id;
2324 }
2325
2326 ret = rdma_listen(id, 0);
2327 if (ret) {
2328 isert_err("rdma_listen() failed: %d\n", ret);
2329 goto out_id;
2330 }
2331
2332 return id;
2333 out_id:
2334 rdma_destroy_id(id);
2335 out:
2336 return ERR_PTR(ret);
2337 }
2338
2339 static int
2340 isert_setup_np(struct iscsi_np *np,
2341 struct sockaddr_storage *ksockaddr)
2342 {
2343 struct isert_np *isert_np;
2344 struct rdma_cm_id *isert_lid;
2345 int ret;
2346
2347 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2348 if (!isert_np)
2349 return -ENOMEM;
2350
2351 sema_init(&isert_np->sem, 0);
2352 mutex_init(&isert_np->mutex);
2353 INIT_LIST_HEAD(&isert_np->accepted);
2354 INIT_LIST_HEAD(&isert_np->pending);
2355 isert_np->np = np;
2356
2357 /*
2358 * Setup the np->np_sockaddr from the passed sockaddr setup
2359 * in iscsi_target_configfs.c code..
2360 */
2361 memcpy(&np->np_sockaddr, ksockaddr,
2362 sizeof(struct sockaddr_storage));
2363
2364 isert_lid = isert_setup_id(isert_np);
2365 if (IS_ERR(isert_lid)) {
2366 ret = PTR_ERR(isert_lid);
2367 goto out;
2368 }
2369
2370 isert_np->cm_id = isert_lid;
2371 np->np_context = isert_np;
2372
2373 return 0;
2374
2375 out:
2376 kfree(isert_np);
2377
2378 return ret;
2379 }
2380
2381 static int
2382 isert_rdma_accept(struct isert_conn *isert_conn)
2383 {
2384 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2385 struct rdma_conn_param cp;
2386 int ret;
2387 struct iser_cm_hdr rsp_hdr;
2388
2389 memset(&cp, 0, sizeof(struct rdma_conn_param));
2390 cp.initiator_depth = isert_conn->initiator_depth;
2391 cp.retry_count = 7;
2392 cp.rnr_retry_count = 7;
2393
2394 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2395 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2396 if (!isert_conn->snd_w_inv)
2397 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2398 cp.private_data = (void *)&rsp_hdr;
2399 cp.private_data_len = sizeof(rsp_hdr);
2400
2401 ret = rdma_accept(cm_id, &cp);
2402 if (ret) {
2403 isert_err("rdma_accept() failed with: %d\n", ret);
2404 return ret;
2405 }
2406
2407 return 0;
2408 }
2409
2410 static int
2411 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2412 {
2413 struct isert_conn *isert_conn = conn->context;
2414 int ret;
2415
2416 isert_info("before login_req comp conn: %p\n", isert_conn);
2417 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2418 if (ret) {
2419 isert_err("isert_conn %p interrupted before got login req\n",
2420 isert_conn);
2421 return ret;
2422 }
2423 reinit_completion(&isert_conn->login_req_comp);
2424
2425 /*
2426 * For login requests after the first PDU, isert_rx_login_req() will
2427 * kick schedule_delayed_work(&conn->login_work) as the packet is
2428 * received, which turns this callback from iscsi_target_do_login_rx()
2429 * into a NOP.
2430 */
2431 if (!login->first_request)
2432 return 0;
2433
2434 isert_rx_login_req(isert_conn);
2435
2436 isert_info("before login_comp conn: %p\n", conn);
2437 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2438 if (ret)
2439 return ret;
2440
2441 isert_info("processing login->req: %p\n", login->req);
2442
2443 return 0;
2444 }
2445
2446 static void
2447 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2448 struct isert_conn *isert_conn)
2449 {
2450 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2451 struct rdma_route *cm_route = &cm_id->route;
2452
2453 conn->login_family = np->np_sockaddr.ss_family;
2454
2455 conn->login_sockaddr = cm_route->addr.dst_addr;
2456 conn->local_sockaddr = cm_route->addr.src_addr;
2457 }
2458
2459 static int
2460 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2461 {
2462 struct isert_np *isert_np = np->np_context;
2463 struct isert_conn *isert_conn;
2464 int ret;
2465
2466 accept_wait:
2467 ret = down_interruptible(&isert_np->sem);
2468 if (ret)
2469 return -ENODEV;
2470
2471 spin_lock_bh(&np->np_thread_lock);
2472 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2473 spin_unlock_bh(&np->np_thread_lock);
2474 isert_dbg("np_thread_state %d\n",
2475 np->np_thread_state);
2476 /**
2477 * No point in stalling here when np_thread
2478 * is in state RESET/SHUTDOWN/EXIT - bail
2479 **/
2480 return -ENODEV;
2481 }
2482 spin_unlock_bh(&np->np_thread_lock);
2483
2484 mutex_lock(&isert_np->mutex);
2485 if (list_empty(&isert_np->pending)) {
2486 mutex_unlock(&isert_np->mutex);
2487 goto accept_wait;
2488 }
2489 isert_conn = list_first_entry(&isert_np->pending,
2490 struct isert_conn, node);
2491 list_del_init(&isert_conn->node);
2492 mutex_unlock(&isert_np->mutex);
2493
2494 conn->context = isert_conn;
2495 isert_conn->conn = conn;
2496 isert_conn->state = ISER_CONN_BOUND;
2497
2498 isert_set_conn_info(np, conn, isert_conn);
2499
2500 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2501
2502 return 0;
2503 }
2504
2505 static void
2506 isert_free_np(struct iscsi_np *np)
2507 {
2508 struct isert_np *isert_np = np->np_context;
2509 struct isert_conn *isert_conn, *n;
2510
2511 if (isert_np->cm_id)
2512 rdma_destroy_id(isert_np->cm_id);
2513
2514 /*
2515 * FIXME: At this point we don't have a good way to insure
2516 * that at this point we don't have hanging connections that
2517 * completed RDMA establishment but didn't start iscsi login
2518 * process. So work-around this by cleaning up what ever piled
2519 * up in accepted and pending lists.
2520 */
2521 mutex_lock(&isert_np->mutex);
2522 if (!list_empty(&isert_np->pending)) {
2523 isert_info("Still have isert pending connections\n");
2524 list_for_each_entry_safe(isert_conn, n,
2525 &isert_np->pending,
2526 node) {
2527 isert_info("cleaning isert_conn %p state (%d)\n",
2528 isert_conn, isert_conn->state);
2529 isert_connect_release(isert_conn);
2530 }
2531 }
2532
2533 if (!list_empty(&isert_np->accepted)) {
2534 isert_info("Still have isert accepted connections\n");
2535 list_for_each_entry_safe(isert_conn, n,
2536 &isert_np->accepted,
2537 node) {
2538 isert_info("cleaning isert_conn %p state (%d)\n",
2539 isert_conn, isert_conn->state);
2540 isert_connect_release(isert_conn);
2541 }
2542 }
2543 mutex_unlock(&isert_np->mutex);
2544
2545 np->np_context = NULL;
2546 kfree(isert_np);
2547 }
2548
2549 static void isert_release_work(struct work_struct *work)
2550 {
2551 struct isert_conn *isert_conn = container_of(work,
2552 struct isert_conn,
2553 release_work);
2554
2555 isert_info("Starting release conn %p\n", isert_conn);
2556
2557 mutex_lock(&isert_conn->mutex);
2558 isert_conn->state = ISER_CONN_DOWN;
2559 mutex_unlock(&isert_conn->mutex);
2560
2561 isert_info("Destroying conn %p\n", isert_conn);
2562 isert_put_conn(isert_conn);
2563 }
2564
2565 static void
2566 isert_wait4logout(struct isert_conn *isert_conn)
2567 {
2568 struct iscsi_conn *conn = isert_conn->conn;
2569
2570 isert_info("conn %p\n", isert_conn);
2571
2572 if (isert_conn->logout_posted) {
2573 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2574 wait_for_completion_timeout(&conn->conn_logout_comp,
2575 SECONDS_FOR_LOGOUT_COMP * HZ);
2576 }
2577 }
2578
2579 static void
2580 isert_wait4cmds(struct iscsi_conn *conn)
2581 {
2582 isert_info("iscsi_conn %p\n", conn);
2583
2584 if (conn->sess) {
2585 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2586 target_wait_for_sess_cmds(conn->sess->se_sess);
2587 }
2588 }
2589
2590 /**
2591 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2592 * unsolicitate dataout
2593 * @conn: iscsi connection
2594 *
2595 * We might still have commands that are waiting for unsolicited
2596 * dataouts messages. We must put the extra reference on those
2597 * before blocking on the target_wait_for_session_cmds
2598 */
2599 static void
2600 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2601 {
2602 struct iscsi_cmd *cmd, *tmp;
2603 static LIST_HEAD(drop_cmd_list);
2604
2605 spin_lock_bh(&conn->cmd_lock);
2606 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2607 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2608 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2609 (cmd->write_data_done < cmd->se_cmd.data_length))
2610 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2611 }
2612 spin_unlock_bh(&conn->cmd_lock);
2613
2614 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2615 list_del_init(&cmd->i_conn_node);
2616 if (cmd->i_state != ISTATE_REMOVE) {
2617 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2618
2619 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2620 isert_put_cmd(isert_cmd, true);
2621 }
2622 }
2623 }
2624
2625 static void isert_wait_conn(struct iscsi_conn *conn)
2626 {
2627 struct isert_conn *isert_conn = conn->context;
2628
2629 isert_info("Starting conn %p\n", isert_conn);
2630
2631 mutex_lock(&isert_conn->mutex);
2632 isert_conn_terminate(isert_conn);
2633 mutex_unlock(&isert_conn->mutex);
2634
2635 ib_drain_qp(isert_conn->qp);
2636 isert_put_unsol_pending_cmds(conn);
2637 isert_wait4cmds(conn);
2638 isert_wait4logout(isert_conn);
2639
2640 queue_work(isert_release_wq, &isert_conn->release_work);
2641 }
2642
2643 static void isert_free_conn(struct iscsi_conn *conn)
2644 {
2645 struct isert_conn *isert_conn = conn->context;
2646
2647 ib_drain_qp(isert_conn->qp);
2648 isert_put_conn(isert_conn);
2649 }
2650
2651 static void isert_get_rx_pdu(struct iscsi_conn *conn)
2652 {
2653 struct completion comp;
2654
2655 init_completion(&comp);
2656
2657 wait_for_completion_interruptible(&comp);
2658 }
2659
2660 static struct iscsit_transport iser_target_transport = {
2661 .name = "IB/iSER",
2662 .transport_type = ISCSI_INFINIBAND,
2663 .rdma_shutdown = true,
2664 .priv_size = sizeof(struct isert_cmd),
2665 .owner = THIS_MODULE,
2666 .iscsit_setup_np = isert_setup_np,
2667 .iscsit_accept_np = isert_accept_np,
2668 .iscsit_free_np = isert_free_np,
2669 .iscsit_wait_conn = isert_wait_conn,
2670 .iscsit_free_conn = isert_free_conn,
2671 .iscsit_get_login_rx = isert_get_login_rx,
2672 .iscsit_put_login_tx = isert_put_login_tx,
2673 .iscsit_immediate_queue = isert_immediate_queue,
2674 .iscsit_response_queue = isert_response_queue,
2675 .iscsit_get_dataout = isert_get_dataout,
2676 .iscsit_queue_data_in = isert_put_datain,
2677 .iscsit_queue_status = isert_put_response,
2678 .iscsit_aborted_task = isert_aborted_task,
2679 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2680 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2681 };
2682
2683 static int __init isert_init(void)
2684 {
2685 int ret;
2686
2687 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2688 WQ_UNBOUND | WQ_HIGHPRI, 0);
2689 if (!isert_comp_wq) {
2690 isert_err("Unable to allocate isert_comp_wq\n");
2691 return -ENOMEM;
2692 }
2693
2694 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2695 WQ_UNBOUND_MAX_ACTIVE);
2696 if (!isert_release_wq) {
2697 isert_err("Unable to allocate isert_release_wq\n");
2698 ret = -ENOMEM;
2699 goto destroy_comp_wq;
2700 }
2701
2702 iscsit_register_transport(&iser_target_transport);
2703 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2704
2705 return 0;
2706
2707 destroy_comp_wq:
2708 destroy_workqueue(isert_comp_wq);
2709
2710 return ret;
2711 }
2712
2713 static void __exit isert_exit(void)
2714 {
2715 flush_scheduled_work();
2716 destroy_workqueue(isert_release_wq);
2717 destroy_workqueue(isert_comp_wq);
2718 iscsit_unregister_transport(&iser_target_transport);
2719 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2720 }
2721
2722 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2723 MODULE_AUTHOR("nab@Linux-iSCSI.org");
2724 MODULE_LICENSE("GPL");
2725
2726 module_init(isert_init);
2727 module_exit(isert_exit);
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git