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
41static int isert_debug_level;
42module_param_named(debug_level, isert_debug_level, int, 0644);
43MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
44
45static DEFINE_MUTEX(device_list_mutex);
46static LIST_HEAD(device_list);
47static struct workqueue_struct *isert_comp_wq;
48static struct workqueue_struct *isert_release_wq;
49
50static int
51isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
52static int
53isert_login_post_recv(struct isert_conn *isert_conn);
54static int
55isert_rdma_accept(struct isert_conn *isert_conn);
56struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
57
58static void isert_release_work(struct work_struct *work);
59static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
60static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
61static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
62static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
63
64static inline bool
65isert_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
72static void
73isert_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
92static struct isert_comp *
93isert_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
114static void
115isert_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
122static struct ib_qp *
123isert_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_send_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
155static int
156isert_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;
169err:
170 isert_comp_put(comp);
171 return ret;
172}
173
174static int
175isert_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 = kcalloc(ISERT_QP_MAX_RECV_DTOS,
185 sizeof(struct iser_rx_desc),
186 GFP_KERNEL);
187 if (!isert_conn->rx_descs)
188 return -ENOMEM;
189
190 rx_desc = isert_conn->rx_descs;
191
192 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
193 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
194 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
195 if (ib_dma_mapping_error(ib_dev, dma_addr))
196 goto dma_map_fail;
197
198 rx_desc->dma_addr = dma_addr;
199
200 rx_sg = &rx_desc->rx_sg;
201 rx_sg->addr = rx_desc->dma_addr;
202 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
203 rx_sg->lkey = device->pd->local_dma_lkey;
204 rx_desc->rx_cqe.done = isert_recv_done;
205 }
206
207 return 0;
208
209dma_map_fail:
210 rx_desc = isert_conn->rx_descs;
211 for (j = 0; j < i; j++, rx_desc++) {
212 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
213 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
214 }
215 kfree(isert_conn->rx_descs);
216 isert_conn->rx_descs = NULL;
217 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
218 return -ENOMEM;
219}
220
221static void
222isert_free_rx_descriptors(struct isert_conn *isert_conn)
223{
224 struct ib_device *ib_dev = isert_conn->device->ib_device;
225 struct iser_rx_desc *rx_desc;
226 int i;
227
228 if (!isert_conn->rx_descs)
229 return;
230
231 rx_desc = isert_conn->rx_descs;
232 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
233 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
234 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
235 }
236
237 kfree(isert_conn->rx_descs);
238 isert_conn->rx_descs = NULL;
239}
240
241static void
242isert_free_comps(struct isert_device *device)
243{
244 int i;
245
246 for (i = 0; i < device->comps_used; i++) {
247 struct isert_comp *comp = &device->comps[i];
248
249 if (comp->cq)
250 ib_free_cq(comp->cq);
251 }
252 kfree(device->comps);
253}
254
255static int
256isert_alloc_comps(struct isert_device *device)
257{
258 int i, max_cqe, ret = 0;
259
260 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
261 device->ib_device->num_comp_vectors));
262
263 isert_info("Using %d CQs, %s supports %d vectors support "
264 "pi_capable %d\n",
265 device->comps_used, dev_name(&device->ib_device->dev),
266 device->ib_device->num_comp_vectors,
267 device->pi_capable);
268
269 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
270 GFP_KERNEL);
271 if (!device->comps)
272 return -ENOMEM;
273
274 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
275
276 for (i = 0; i < device->comps_used; i++) {
277 struct isert_comp *comp = &device->comps[i];
278
279 comp->device = device;
280 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
281 IB_POLL_WORKQUEUE);
282 if (IS_ERR(comp->cq)) {
283 isert_err("Unable to allocate cq\n");
284 ret = PTR_ERR(comp->cq);
285 comp->cq = NULL;
286 goto out_cq;
287 }
288 }
289
290 return 0;
291out_cq:
292 isert_free_comps(device);
293 return ret;
294}
295
296static int
297isert_create_device_ib_res(struct isert_device *device)
298{
299 struct ib_device *ib_dev = device->ib_device;
300 int ret;
301
302 isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
303 ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
304 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
305
306 ret = isert_alloc_comps(device);
307 if (ret)
308 goto out;
309
310 device->pd = ib_alloc_pd(ib_dev, 0);
311 if (IS_ERR(device->pd)) {
312 ret = PTR_ERR(device->pd);
313 isert_err("failed to allocate pd, device %p, ret=%d\n",
314 device, ret);
315 goto out_cq;
316 }
317
318 /* Check signature cap */
319 device->pi_capable = ib_dev->attrs.device_cap_flags &
320 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
321
322 return 0;
323
324out_cq:
325 isert_free_comps(device);
326out:
327 if (ret > 0)
328 ret = -EINVAL;
329 return ret;
330}
331
332static void
333isert_free_device_ib_res(struct isert_device *device)
334{
335 isert_info("device %p\n", device);
336
337 ib_dealloc_pd(device->pd);
338 isert_free_comps(device);
339}
340
341static void
342isert_device_put(struct isert_device *device)
343{
344 mutex_lock(&device_list_mutex);
345 device->refcount--;
346 isert_info("device %p refcount %d\n", device, device->refcount);
347 if (!device->refcount) {
348 isert_free_device_ib_res(device);
349 list_del(&device->dev_node);
350 kfree(device);
351 }
352 mutex_unlock(&device_list_mutex);
353}
354
355static struct isert_device *
356isert_device_get(struct rdma_cm_id *cma_id)
357{
358 struct isert_device *device;
359 int ret;
360
361 mutex_lock(&device_list_mutex);
362 list_for_each_entry(device, &device_list, dev_node) {
363 if (device->ib_device->node_guid == cma_id->device->node_guid) {
364 device->refcount++;
365 isert_info("Found iser device %p refcount %d\n",
366 device, device->refcount);
367 mutex_unlock(&device_list_mutex);
368 return device;
369 }
370 }
371
372 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
373 if (!device) {
374 mutex_unlock(&device_list_mutex);
375 return ERR_PTR(-ENOMEM);
376 }
377
378 INIT_LIST_HEAD(&device->dev_node);
379
380 device->ib_device = cma_id->device;
381 ret = isert_create_device_ib_res(device);
382 if (ret) {
383 kfree(device);
384 mutex_unlock(&device_list_mutex);
385 return ERR_PTR(ret);
386 }
387
388 device->refcount++;
389 list_add_tail(&device->dev_node, &device_list);
390 isert_info("Created a new iser device %p refcount %d\n",
391 device, device->refcount);
392 mutex_unlock(&device_list_mutex);
393
394 return device;
395}
396
397static void
398isert_init_conn(struct isert_conn *isert_conn)
399{
400 isert_conn->state = ISER_CONN_INIT;
401 INIT_LIST_HEAD(&isert_conn->node);
402 init_completion(&isert_conn->login_comp);
403 init_completion(&isert_conn->login_req_comp);
404 init_waitqueue_head(&isert_conn->rem_wait);
405 kref_init(&isert_conn->kref);
406 mutex_init(&isert_conn->mutex);
407 INIT_WORK(&isert_conn->release_work, isert_release_work);
408}
409
410static void
411isert_free_login_buf(struct isert_conn *isert_conn)
412{
413 struct ib_device *ib_dev = isert_conn->device->ib_device;
414
415 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
416 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
417 kfree(isert_conn->login_rsp_buf);
418
419 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
420 ISER_RX_PAYLOAD_SIZE,
421 DMA_FROM_DEVICE);
422 kfree(isert_conn->login_req_buf);
423}
424
425static int
426isert_alloc_login_buf(struct isert_conn *isert_conn,
427 struct ib_device *ib_dev)
428{
429 int ret;
430
431 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
432 GFP_KERNEL);
433 if (!isert_conn->login_req_buf)
434 return -ENOMEM;
435
436 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
437 isert_conn->login_req_buf,
438 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
439 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
440 if (ret) {
441 isert_err("login_req_dma mapping error: %d\n", ret);
442 isert_conn->login_req_dma = 0;
443 goto out_free_login_req_buf;
444 }
445
446 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
447 if (!isert_conn->login_rsp_buf) {
448 ret = -ENOMEM;
449 goto out_unmap_login_req_buf;
450 }
451
452 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
453 isert_conn->login_rsp_buf,
454 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
455 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
456 if (ret) {
457 isert_err("login_rsp_dma mapping error: %d\n", ret);
458 isert_conn->login_rsp_dma = 0;
459 goto out_free_login_rsp_buf;
460 }
461
462 return 0;
463
464out_free_login_rsp_buf:
465 kfree(isert_conn->login_rsp_buf);
466out_unmap_login_req_buf:
467 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
468 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
469out_free_login_req_buf:
470 kfree(isert_conn->login_req_buf);
471 return ret;
472}
473
474static void
475isert_set_nego_params(struct isert_conn *isert_conn,
476 struct rdma_conn_param *param)
477{
478 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
479
480 /* Set max inflight RDMA READ requests */
481 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
482 attr->max_qp_init_rd_atom);
483 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
484
485 if (param->private_data) {
486 u8 flags = *(u8 *)param->private_data;
487
488 /*
489 * use remote invalidation if the both initiator
490 * and the HCA support it
491 */
492 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
493 (attr->device_cap_flags &
494 IB_DEVICE_MEM_MGT_EXTENSIONS);
495 if (isert_conn->snd_w_inv)
496 isert_info("Using remote invalidation\n");
497 }
498}
499
500static int
501isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
502{
503 struct isert_np *isert_np = cma_id->context;
504 struct iscsi_np *np = isert_np->np;
505 struct isert_conn *isert_conn;
506 struct isert_device *device;
507 int ret = 0;
508
509 spin_lock_bh(&np->np_thread_lock);
510 if (!np->enabled) {
511 spin_unlock_bh(&np->np_thread_lock);
512 isert_dbg("iscsi_np is not enabled, reject connect request\n");
513 return rdma_reject(cma_id, NULL, 0);
514 }
515 spin_unlock_bh(&np->np_thread_lock);
516
517 isert_dbg("cma_id: %p, portal: %p\n",
518 cma_id, cma_id->context);
519
520 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
521 if (!isert_conn)
522 return -ENOMEM;
523
524 isert_init_conn(isert_conn);
525 isert_conn->cm_id = cma_id;
526
527 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
528 if (ret)
529 goto out;
530
531 device = isert_device_get(cma_id);
532 if (IS_ERR(device)) {
533 ret = PTR_ERR(device);
534 goto out_rsp_dma_map;
535 }
536 isert_conn->device = device;
537
538 isert_set_nego_params(isert_conn, &event->param.conn);
539
540 ret = isert_conn_setup_qp(isert_conn, cma_id);
541 if (ret)
542 goto out_conn_dev;
543
544 ret = isert_login_post_recv(isert_conn);
545 if (ret)
546 goto out_conn_dev;
547
548 ret = isert_rdma_accept(isert_conn);
549 if (ret)
550 goto out_conn_dev;
551
552 mutex_lock(&isert_np->mutex);
553 list_add_tail(&isert_conn->node, &isert_np->accepted);
554 mutex_unlock(&isert_np->mutex);
555
556 return 0;
557
558out_conn_dev:
559 isert_device_put(device);
560out_rsp_dma_map:
561 isert_free_login_buf(isert_conn);
562out:
563 kfree(isert_conn);
564 rdma_reject(cma_id, NULL, 0);
565 return ret;
566}
567
568static void
569isert_connect_release(struct isert_conn *isert_conn)
570{
571 struct isert_device *device = isert_conn->device;
572
573 isert_dbg("conn %p\n", isert_conn);
574
575 BUG_ON(!device);
576
577 isert_free_rx_descriptors(isert_conn);
578 if (isert_conn->cm_id &&
579 !isert_conn->dev_removed)
580 rdma_destroy_id(isert_conn->cm_id);
581
582 if (isert_conn->qp) {
583 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
584
585 isert_comp_put(comp);
586 ib_destroy_qp(isert_conn->qp);
587 }
588
589 if (isert_conn->login_req_buf)
590 isert_free_login_buf(isert_conn);
591
592 isert_device_put(device);
593
594 if (isert_conn->dev_removed)
595 wake_up_interruptible(&isert_conn->rem_wait);
596 else
597 kfree(isert_conn);
598}
599
600static void
601isert_connected_handler(struct rdma_cm_id *cma_id)
602{
603 struct isert_conn *isert_conn = cma_id->qp->qp_context;
604 struct isert_np *isert_np = cma_id->context;
605
606 isert_info("conn %p\n", isert_conn);
607
608 mutex_lock(&isert_conn->mutex);
609 isert_conn->state = ISER_CONN_UP;
610 kref_get(&isert_conn->kref);
611 mutex_unlock(&isert_conn->mutex);
612
613 mutex_lock(&isert_np->mutex);
614 list_move_tail(&isert_conn->node, &isert_np->pending);
615 mutex_unlock(&isert_np->mutex);
616
617 isert_info("np %p: Allow accept_np to continue\n", isert_np);
618 up(&isert_np->sem);
619}
620
621static void
622isert_release_kref(struct kref *kref)
623{
624 struct isert_conn *isert_conn = container_of(kref,
625 struct isert_conn, kref);
626
627 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
628 current->pid);
629
630 isert_connect_release(isert_conn);
631}
632
633static void
634isert_put_conn(struct isert_conn *isert_conn)
635{
636 kref_put(&isert_conn->kref, isert_release_kref);
637}
638
639static void
640isert_handle_unbound_conn(struct isert_conn *isert_conn)
641{
642 struct isert_np *isert_np = isert_conn->cm_id->context;
643
644 mutex_lock(&isert_np->mutex);
645 if (!list_empty(&isert_conn->node)) {
646 /*
647 * This means iscsi doesn't know this connection
648 * so schedule a cleanup ourselves
649 */
650 list_del_init(&isert_conn->node);
651 isert_put_conn(isert_conn);
652 queue_work(isert_release_wq, &isert_conn->release_work);
653 }
654 mutex_unlock(&isert_np->mutex);
655}
656
657/**
658 * isert_conn_terminate() - Initiate connection termination
659 * @isert_conn: isert connection struct
660 *
661 * Notes:
662 * In case the connection state is BOUND, move state
663 * to TEMINATING and start teardown sequence (rdma_disconnect).
664 * In case the connection state is UP, complete flush as well.
665 *
666 * This routine must be called with mutex held. Thus it is
667 * safe to call multiple times.
668 */
669static void
670isert_conn_terminate(struct isert_conn *isert_conn)
671{
672 int err;
673
674 if (isert_conn->state >= ISER_CONN_TERMINATING)
675 return;
676
677 isert_info("Terminating conn %p state %d\n",
678 isert_conn, isert_conn->state);
679 isert_conn->state = ISER_CONN_TERMINATING;
680 err = rdma_disconnect(isert_conn->cm_id);
681 if (err)
682 isert_warn("Failed rdma_disconnect isert_conn %p\n",
683 isert_conn);
684}
685
686static int
687isert_np_cma_handler(struct isert_np *isert_np,
688 enum rdma_cm_event_type event)
689{
690 isert_dbg("%s (%d): isert np %p\n",
691 rdma_event_msg(event), event, isert_np);
692
693 switch (event) {
694 case RDMA_CM_EVENT_DEVICE_REMOVAL:
695 isert_np->cm_id = NULL;
696 break;
697 case RDMA_CM_EVENT_ADDR_CHANGE:
698 isert_np->cm_id = isert_setup_id(isert_np);
699 if (IS_ERR(isert_np->cm_id)) {
700 isert_err("isert np %p setup id failed: %ld\n",
701 isert_np, PTR_ERR(isert_np->cm_id));
702 isert_np->cm_id = NULL;
703 }
704 break;
705 default:
706 isert_err("isert np %p Unexpected event %d\n",
707 isert_np, event);
708 }
709
710 return -1;
711}
712
713static int
714isert_disconnected_handler(struct rdma_cm_id *cma_id,
715 enum rdma_cm_event_type event)
716{
717 struct isert_conn *isert_conn = cma_id->qp->qp_context;
718
719 mutex_lock(&isert_conn->mutex);
720 switch (isert_conn->state) {
721 case ISER_CONN_TERMINATING:
722 break;
723 case ISER_CONN_UP:
724 isert_conn_terminate(isert_conn);
725 ib_drain_qp(isert_conn->qp);
726 isert_handle_unbound_conn(isert_conn);
727 break;
728 case ISER_CONN_BOUND:
729 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
730 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
731 break;
732 default:
733 isert_warn("conn %p terminating in state %d\n",
734 isert_conn, isert_conn->state);
735 }
736 mutex_unlock(&isert_conn->mutex);
737
738 return 0;
739}
740
741static int
742isert_connect_error(struct rdma_cm_id *cma_id)
743{
744 struct isert_conn *isert_conn = cma_id->qp->qp_context;
745
746 ib_drain_qp(isert_conn->qp);
747 list_del_init(&isert_conn->node);
748 isert_conn->cm_id = NULL;
749 isert_put_conn(isert_conn);
750
751 return -1;
752}
753
754static int
755isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
756{
757 struct isert_np *isert_np = cma_id->context;
758 struct isert_conn *isert_conn;
759 int ret = 0;
760
761 isert_info("%s (%d): status %d id %p np %p\n",
762 rdma_event_msg(event->event), event->event,
763 event->status, cma_id, cma_id->context);
764
765 if (isert_np->cm_id == cma_id)
766 return isert_np_cma_handler(cma_id->context, event->event);
767
768 switch (event->event) {
769 case RDMA_CM_EVENT_CONNECT_REQUEST:
770 ret = isert_connect_request(cma_id, event);
771 if (ret)
772 isert_err("failed handle connect request %d\n", ret);
773 break;
774 case RDMA_CM_EVENT_ESTABLISHED:
775 isert_connected_handler(cma_id);
776 break;
777 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
778 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
779 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
780 ret = isert_disconnected_handler(cma_id, event->event);
781 break;
782 case RDMA_CM_EVENT_DEVICE_REMOVAL:
783 isert_conn = cma_id->qp->qp_context;
784 isert_conn->dev_removed = true;
785 isert_disconnected_handler(cma_id, event->event);
786 wait_event_interruptible(isert_conn->rem_wait,
787 isert_conn->state == ISER_CONN_DOWN);
788 kfree(isert_conn);
789 /*
790 * return non-zero from the callback to destroy
791 * the rdma cm id
792 */
793 return 1;
794 case RDMA_CM_EVENT_REJECTED:
795 isert_info("Connection rejected: %s\n",
796 rdma_reject_msg(cma_id, event->status));
797 /* fall through */
798 case RDMA_CM_EVENT_UNREACHABLE:
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
810static int
811isert_post_recvm(struct isert_conn *isert_conn, u32 count)
812{
813 struct ib_recv_wr *rx_wr;
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 rx_desc->in_use = false;
825 }
826 rx_wr--;
827 rx_wr->next = NULL; /* mark end of work requests list */
828
829 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
830 if (ret)
831 isert_err("ib_post_recv() failed with ret: %d\n", ret);
832
833 return ret;
834}
835
836static int
837isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
838{
839 struct ib_recv_wr rx_wr;
840 int ret;
841
842 if (!rx_desc->in_use) {
843 /*
844 * if the descriptor is not in-use we already reposted it
845 * for recv, so just silently return
846 */
847 return 0;
848 }
849
850 rx_desc->in_use = false;
851 rx_wr.wr_cqe = &rx_desc->rx_cqe;
852 rx_wr.sg_list = &rx_desc->rx_sg;
853 rx_wr.num_sge = 1;
854 rx_wr.next = NULL;
855
856 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
857 if (ret)
858 isert_err("ib_post_recv() failed with ret: %d\n", ret);
859
860 return ret;
861}
862
863static int
864isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
865{
866 struct ib_device *ib_dev = isert_conn->cm_id->device;
867 struct ib_send_wr send_wr;
868 int ret;
869
870 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
871 ISER_HEADERS_LEN, DMA_TO_DEVICE);
872
873 tx_desc->tx_cqe.done = isert_login_send_done;
874
875 send_wr.next = NULL;
876 send_wr.wr_cqe = &tx_desc->tx_cqe;
877 send_wr.sg_list = tx_desc->tx_sg;
878 send_wr.num_sge = tx_desc->num_sge;
879 send_wr.opcode = IB_WR_SEND;
880 send_wr.send_flags = IB_SEND_SIGNALED;
881
882 ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
883 if (ret)
884 isert_err("ib_post_send() failed, ret: %d\n", ret);
885
886 return ret;
887}
888
889static void
890__isert_create_send_desc(struct isert_device *device,
891 struct iser_tx_desc *tx_desc)
892{
893
894 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
895 tx_desc->iser_header.flags = ISCSI_CTRL;
896
897 tx_desc->num_sge = 1;
898
899 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
900 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
901 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
902 }
903}
904
905static void
906isert_create_send_desc(struct isert_conn *isert_conn,
907 struct isert_cmd *isert_cmd,
908 struct iser_tx_desc *tx_desc)
909{
910 struct isert_device *device = isert_conn->device;
911 struct ib_device *ib_dev = device->ib_device;
912
913 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
914 ISER_HEADERS_LEN, DMA_TO_DEVICE);
915
916 __isert_create_send_desc(device, tx_desc);
917}
918
919static int
920isert_init_tx_hdrs(struct isert_conn *isert_conn,
921 struct iser_tx_desc *tx_desc)
922{
923 struct isert_device *device = isert_conn->device;
924 struct ib_device *ib_dev = device->ib_device;
925 u64 dma_addr;
926
927 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
928 ISER_HEADERS_LEN, DMA_TO_DEVICE);
929 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
930 isert_err("ib_dma_mapping_error() failed\n");
931 return -ENOMEM;
932 }
933
934 tx_desc->dma_addr = dma_addr;
935 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
936 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
937 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
938
939 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
940 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
941 tx_desc->tx_sg[0].lkey);
942
943 return 0;
944}
945
946static void
947isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
948 struct ib_send_wr *send_wr)
949{
950 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
951
952 tx_desc->tx_cqe.done = isert_send_done;
953 send_wr->wr_cqe = &tx_desc->tx_cqe;
954
955 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
956 send_wr->opcode = IB_WR_SEND_WITH_INV;
957 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
958 } else {
959 send_wr->opcode = IB_WR_SEND;
960 }
961
962 send_wr->sg_list = &tx_desc->tx_sg[0];
963 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
964 send_wr->send_flags = IB_SEND_SIGNALED;
965}
966
967static int
968isert_login_post_recv(struct isert_conn *isert_conn)
969{
970 struct ib_recv_wr rx_wr;
971 struct ib_sge sge;
972 int ret;
973
974 memset(&sge, 0, sizeof(struct ib_sge));
975 sge.addr = isert_conn->login_req_dma;
976 sge.length = ISER_RX_PAYLOAD_SIZE;
977 sge.lkey = isert_conn->device->pd->local_dma_lkey;
978
979 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
980 sge.addr, sge.length, sge.lkey);
981
982 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
983
984 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
985 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
986 rx_wr.sg_list = &sge;
987 rx_wr.num_sge = 1;
988
989 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
990 if (ret)
991 isert_err("ib_post_recv() failed: %d\n", ret);
992
993 return ret;
994}
995
996static int
997isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
998 u32 length)
999{
1000 struct isert_conn *isert_conn = conn->context;
1001 struct isert_device *device = isert_conn->device;
1002 struct ib_device *ib_dev = device->ib_device;
1003 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1004 int ret;
1005
1006 __isert_create_send_desc(device, tx_desc);
1007
1008 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1009 sizeof(struct iscsi_hdr));
1010
1011 isert_init_tx_hdrs(isert_conn, tx_desc);
1012
1013 if (length > 0) {
1014 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1015
1016 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1017 length, DMA_TO_DEVICE);
1018
1019 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1020
1021 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1022 length, DMA_TO_DEVICE);
1023
1024 tx_dsg->addr = isert_conn->login_rsp_dma;
1025 tx_dsg->length = length;
1026 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1027 tx_desc->num_sge = 2;
1028 }
1029 if (!login->login_failed) {
1030 if (login->login_complete) {
1031 ret = isert_alloc_rx_descriptors(isert_conn);
1032 if (ret)
1033 return ret;
1034
1035 ret = isert_post_recvm(isert_conn,
1036 ISERT_QP_MAX_RECV_DTOS);
1037 if (ret)
1038 return ret;
1039
1040 /* Now we are in FULL_FEATURE phase */
1041 mutex_lock(&isert_conn->mutex);
1042 isert_conn->state = ISER_CONN_FULL_FEATURE;
1043 mutex_unlock(&isert_conn->mutex);
1044 goto post_send;
1045 }
1046
1047 ret = isert_login_post_recv(isert_conn);
1048 if (ret)
1049 return ret;
1050 }
1051post_send:
1052 ret = isert_login_post_send(isert_conn, tx_desc);
1053 if (ret)
1054 return ret;
1055
1056 return 0;
1057}
1058
1059static void
1060isert_rx_login_req(struct isert_conn *isert_conn)
1061{
1062 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1063 int rx_buflen = isert_conn->login_req_len;
1064 struct iscsi_conn *conn = isert_conn->conn;
1065 struct iscsi_login *login = conn->conn_login;
1066 int size;
1067
1068 isert_info("conn %p\n", isert_conn);
1069
1070 WARN_ON_ONCE(!login);
1071
1072 if (login->first_request) {
1073 struct iscsi_login_req *login_req =
1074 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1075 /*
1076 * Setup the initial iscsi_login values from the leading
1077 * login request PDU.
1078 */
1079 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1080 login->current_stage =
1081 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1082 >> 2;
1083 login->version_min = login_req->min_version;
1084 login->version_max = login_req->max_version;
1085 memcpy(login->isid, login_req->isid, 6);
1086 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1087 login->init_task_tag = login_req->itt;
1088 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1089 login->cid = be16_to_cpu(login_req->cid);
1090 login->tsih = be16_to_cpu(login_req->tsih);
1091 }
1092
1093 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1094
1095 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1096 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1097 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1098 MAX_KEY_VALUE_PAIRS);
1099 memcpy(login->req_buf, &rx_desc->data[0], size);
1100
1101 if (login->first_request) {
1102 complete(&isert_conn->login_comp);
1103 return;
1104 }
1105 schedule_delayed_work(&conn->login_work, 0);
1106}
1107
1108static struct iscsi_cmd
1109*isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1110{
1111 struct isert_conn *isert_conn = conn->context;
1112 struct isert_cmd *isert_cmd;
1113 struct iscsi_cmd *cmd;
1114
1115 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1116 if (!cmd) {
1117 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1118 return NULL;
1119 }
1120 isert_cmd = iscsit_priv_cmd(cmd);
1121 isert_cmd->conn = isert_conn;
1122 isert_cmd->iscsi_cmd = cmd;
1123 isert_cmd->rx_desc = rx_desc;
1124
1125 return cmd;
1126}
1127
1128static int
1129isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1130 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1131 struct iser_rx_desc *rx_desc, unsigned char *buf)
1132{
1133 struct iscsi_conn *conn = isert_conn->conn;
1134 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1135 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1136 bool dump_payload = false;
1137 unsigned int data_len;
1138
1139 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1140 if (rc < 0)
1141 return rc;
1142
1143 imm_data = cmd->immediate_data;
1144 imm_data_len = cmd->first_burst_len;
1145 unsol_data = cmd->unsolicited_data;
1146 data_len = cmd->se_cmd.data_length;
1147
1148 if (imm_data && imm_data_len == data_len)
1149 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1150 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1151 if (rc < 0) {
1152 return 0;
1153 } else if (rc > 0) {
1154 dump_payload = true;
1155 goto sequence_cmd;
1156 }
1157
1158 if (!imm_data)
1159 return 0;
1160
1161 if (imm_data_len != data_len) {
1162 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1163 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1164 &rx_desc->data[0], imm_data_len);
1165 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1166 sg_nents, imm_data_len);
1167 } else {
1168 sg_init_table(&isert_cmd->sg, 1);
1169 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1170 cmd->se_cmd.t_data_nents = 1;
1171 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1172 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1173 imm_data_len);
1174 }
1175
1176 cmd->write_data_done += imm_data_len;
1177
1178 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1179 spin_lock_bh(&cmd->istate_lock);
1180 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1181 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1182 spin_unlock_bh(&cmd->istate_lock);
1183 }
1184
1185sequence_cmd:
1186 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1187
1188 if (!rc && dump_payload == false && unsol_data)
1189 iscsit_set_unsolicited_dataout(cmd);
1190 else if (dump_payload && imm_data)
1191 target_put_sess_cmd(&cmd->se_cmd);
1192
1193 return 0;
1194}
1195
1196static int
1197isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1198 struct iser_rx_desc *rx_desc, unsigned char *buf)
1199{
1200 struct scatterlist *sg_start;
1201 struct iscsi_conn *conn = isert_conn->conn;
1202 struct iscsi_cmd *cmd = NULL;
1203 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1204 u32 unsol_data_len = ntoh24(hdr->dlength);
1205 int rc, sg_nents, sg_off, page_off;
1206
1207 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1208 if (rc < 0)
1209 return rc;
1210 else if (!cmd)
1211 return 0;
1212 /*
1213 * FIXME: Unexpected unsolicited_data out
1214 */
1215 if (!cmd->unsolicited_data) {
1216 isert_err("Received unexpected solicited data payload\n");
1217 dump_stack();
1218 return -1;
1219 }
1220
1221 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1222 "write_data_done: %u, data_length: %u\n",
1223 unsol_data_len, cmd->write_data_done,
1224 cmd->se_cmd.data_length);
1225
1226 sg_off = cmd->write_data_done / PAGE_SIZE;
1227 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1228 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1229 page_off = cmd->write_data_done % PAGE_SIZE;
1230 /*
1231 * FIXME: Non page-aligned unsolicited_data out
1232 */
1233 if (page_off) {
1234 isert_err("unexpected non-page aligned data payload\n");
1235 dump_stack();
1236 return -1;
1237 }
1238 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1239 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1240 sg_nents, &rx_desc->data[0], unsol_data_len);
1241
1242 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1243 unsol_data_len);
1244
1245 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1246 if (rc < 0)
1247 return rc;
1248
1249 /*
1250 * multiple data-outs on the same command can arrive -
1251 * so post the buffer before hand
1252 */
1253 rc = isert_post_recv(isert_conn, rx_desc);
1254 if (rc) {
1255 isert_err("ib_post_recv failed with %d\n", rc);
1256 return rc;
1257 }
1258 return 0;
1259}
1260
1261static int
1262isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1263 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1264 unsigned char *buf)
1265{
1266 struct iscsi_conn *conn = isert_conn->conn;
1267 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1268 int rc;
1269
1270 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1271 if (rc < 0)
1272 return rc;
1273 /*
1274 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1275 */
1276
1277 return iscsit_process_nop_out(conn, cmd, hdr);
1278}
1279
1280static int
1281isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1282 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1283 struct iscsi_text *hdr)
1284{
1285 struct iscsi_conn *conn = isert_conn->conn;
1286 u32 payload_length = ntoh24(hdr->dlength);
1287 int rc;
1288 unsigned char *text_in = NULL;
1289
1290 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1291 if (rc < 0)
1292 return rc;
1293
1294 if (payload_length) {
1295 text_in = kzalloc(payload_length, GFP_KERNEL);
1296 if (!text_in)
1297 return -ENOMEM;
1298 }
1299 cmd->text_in_ptr = text_in;
1300
1301 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1302
1303 return iscsit_process_text_cmd(conn, cmd, hdr);
1304}
1305
1306static int
1307isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1308 uint32_t read_stag, uint64_t read_va,
1309 uint32_t write_stag, uint64_t write_va)
1310{
1311 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1312 struct iscsi_conn *conn = isert_conn->conn;
1313 struct iscsi_cmd *cmd;
1314 struct isert_cmd *isert_cmd;
1315 int ret = -EINVAL;
1316 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1317
1318 if (conn->sess->sess_ops->SessionType &&
1319 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1320 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1321 " ignoring\n", opcode);
1322 return 0;
1323 }
1324
1325 switch (opcode) {
1326 case ISCSI_OP_SCSI_CMD:
1327 cmd = isert_allocate_cmd(conn, rx_desc);
1328 if (!cmd)
1329 break;
1330
1331 isert_cmd = iscsit_priv_cmd(cmd);
1332 isert_cmd->read_stag = read_stag;
1333 isert_cmd->read_va = read_va;
1334 isert_cmd->write_stag = write_stag;
1335 isert_cmd->write_va = write_va;
1336 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1337
1338 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1339 rx_desc, (unsigned char *)hdr);
1340 break;
1341 case ISCSI_OP_NOOP_OUT:
1342 cmd = isert_allocate_cmd(conn, rx_desc);
1343 if (!cmd)
1344 break;
1345
1346 isert_cmd = iscsit_priv_cmd(cmd);
1347 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1348 rx_desc, (unsigned char *)hdr);
1349 break;
1350 case ISCSI_OP_SCSI_DATA_OUT:
1351 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1352 (unsigned char *)hdr);
1353 break;
1354 case ISCSI_OP_SCSI_TMFUNC:
1355 cmd = isert_allocate_cmd(conn, rx_desc);
1356 if (!cmd)
1357 break;
1358
1359 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1360 (unsigned char *)hdr);
1361 break;
1362 case ISCSI_OP_LOGOUT:
1363 cmd = isert_allocate_cmd(conn, rx_desc);
1364 if (!cmd)
1365 break;
1366
1367 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1368 break;
1369 case ISCSI_OP_TEXT:
1370 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1371 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1372 else
1373 cmd = isert_allocate_cmd(conn, rx_desc);
1374
1375 if (!cmd)
1376 break;
1377
1378 isert_cmd = iscsit_priv_cmd(cmd);
1379 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1380 rx_desc, (struct iscsi_text *)hdr);
1381 break;
1382 default:
1383 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1384 dump_stack();
1385 break;
1386 }
1387
1388 return ret;
1389}
1390
1391static void
1392isert_print_wc(struct ib_wc *wc, const char *type)
1393{
1394 if (wc->status != IB_WC_WR_FLUSH_ERR)
1395 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1396 ib_wc_status_msg(wc->status), wc->status,
1397 wc->vendor_err);
1398 else
1399 isert_dbg("%s failure: %s (%d)\n", type,
1400 ib_wc_status_msg(wc->status), wc->status);
1401}
1402
1403static void
1404isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1405{
1406 struct isert_conn *isert_conn = wc->qp->qp_context;
1407 struct ib_device *ib_dev = isert_conn->cm_id->device;
1408 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1409 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1410 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1411 uint64_t read_va = 0, write_va = 0;
1412 uint32_t read_stag = 0, write_stag = 0;
1413
1414 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1415 isert_print_wc(wc, "recv");
1416 if (wc->status != IB_WC_WR_FLUSH_ERR)
1417 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1418 return;
1419 }
1420
1421 rx_desc->in_use = true;
1422
1423 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1424 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1425
1426 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1427 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1428 (int)(wc->byte_len - ISER_HEADERS_LEN));
1429
1430 switch (iser_ctrl->flags & 0xF0) {
1431 case ISCSI_CTRL:
1432 if (iser_ctrl->flags & ISER_RSV) {
1433 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1434 read_va = be64_to_cpu(iser_ctrl->read_va);
1435 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1436 read_stag, (unsigned long long)read_va);
1437 }
1438 if (iser_ctrl->flags & ISER_WSV) {
1439 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1440 write_va = be64_to_cpu(iser_ctrl->write_va);
1441 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1442 write_stag, (unsigned long long)write_va);
1443 }
1444
1445 isert_dbg("ISER ISCSI_CTRL PDU\n");
1446 break;
1447 case ISER_HELLO:
1448 isert_err("iSER Hello message\n");
1449 break;
1450 default:
1451 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1452 break;
1453 }
1454
1455 isert_rx_opcode(isert_conn, rx_desc,
1456 read_stag, read_va, write_stag, write_va);
1457
1458 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1459 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1460}
1461
1462static void
1463isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1464{
1465 struct isert_conn *isert_conn = wc->qp->qp_context;
1466 struct ib_device *ib_dev = isert_conn->device->ib_device;
1467
1468 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1469 isert_print_wc(wc, "login recv");
1470 return;
1471 }
1472
1473 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1474 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1475
1476 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1477
1478 if (isert_conn->conn) {
1479 struct iscsi_login *login = isert_conn->conn->conn_login;
1480
1481 if (login && !login->first_request)
1482 isert_rx_login_req(isert_conn);
1483 }
1484
1485 mutex_lock(&isert_conn->mutex);
1486 complete(&isert_conn->login_req_comp);
1487 mutex_unlock(&isert_conn->mutex);
1488
1489 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1490 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1491}
1492
1493static void
1494isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1495{
1496 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1497 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1498
1499 if (!cmd->rw.nr_ops)
1500 return;
1501
1502 if (isert_prot_cmd(conn, se_cmd)) {
1503 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1504 conn->cm_id->port_num, se_cmd->t_data_sg,
1505 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1506 se_cmd->t_prot_nents, dir);
1507 } else {
1508 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1509 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1510 }
1511
1512 cmd->rw.nr_ops = 0;
1513}
1514
1515static void
1516isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1517{
1518 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1519 struct isert_conn *isert_conn = isert_cmd->conn;
1520 struct iscsi_conn *conn = isert_conn->conn;
1521 struct iscsi_text_rsp *hdr;
1522
1523 isert_dbg("Cmd %p\n", isert_cmd);
1524
1525 switch (cmd->iscsi_opcode) {
1526 case ISCSI_OP_SCSI_CMD:
1527 spin_lock_bh(&conn->cmd_lock);
1528 if (!list_empty(&cmd->i_conn_node))
1529 list_del_init(&cmd->i_conn_node);
1530 spin_unlock_bh(&conn->cmd_lock);
1531
1532 if (cmd->data_direction == DMA_TO_DEVICE) {
1533 iscsit_stop_dataout_timer(cmd);
1534 /*
1535 * Check for special case during comp_err where
1536 * WRITE_PENDING has been handed off from core,
1537 * but requires an extra target_put_sess_cmd()
1538 * before transport_generic_free_cmd() below.
1539 */
1540 if (comp_err &&
1541 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1542 struct se_cmd *se_cmd = &cmd->se_cmd;
1543
1544 target_put_sess_cmd(se_cmd);
1545 }
1546 }
1547
1548 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1549 transport_generic_free_cmd(&cmd->se_cmd, 0);
1550 break;
1551 case ISCSI_OP_SCSI_TMFUNC:
1552 spin_lock_bh(&conn->cmd_lock);
1553 if (!list_empty(&cmd->i_conn_node))
1554 list_del_init(&cmd->i_conn_node);
1555 spin_unlock_bh(&conn->cmd_lock);
1556
1557 transport_generic_free_cmd(&cmd->se_cmd, 0);
1558 break;
1559 case ISCSI_OP_REJECT:
1560 case ISCSI_OP_NOOP_OUT:
1561 case ISCSI_OP_TEXT:
1562 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1563 /* If the continue bit is on, keep the command alive */
1564 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1565 break;
1566
1567 spin_lock_bh(&conn->cmd_lock);
1568 if (!list_empty(&cmd->i_conn_node))
1569 list_del_init(&cmd->i_conn_node);
1570 spin_unlock_bh(&conn->cmd_lock);
1571
1572 /*
1573 * Handle special case for REJECT when iscsi_add_reject*() has
1574 * overwritten the original iscsi_opcode assignment, and the
1575 * associated cmd->se_cmd needs to be released.
1576 */
1577 if (cmd->se_cmd.se_tfo != NULL) {
1578 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1579 cmd->iscsi_opcode);
1580 transport_generic_free_cmd(&cmd->se_cmd, 0);
1581 break;
1582 }
1583 /* fall through */
1584 default:
1585 iscsit_release_cmd(cmd);
1586 break;
1587 }
1588}
1589
1590static void
1591isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1592{
1593 if (tx_desc->dma_addr != 0) {
1594 isert_dbg("unmap single for tx_desc->dma_addr\n");
1595 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1596 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1597 tx_desc->dma_addr = 0;
1598 }
1599}
1600
1601static void
1602isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1603 struct ib_device *ib_dev, bool comp_err)
1604{
1605 if (isert_cmd->pdu_buf_dma != 0) {
1606 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1607 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1608 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1609 isert_cmd->pdu_buf_dma = 0;
1610 }
1611
1612 isert_unmap_tx_desc(tx_desc, ib_dev);
1613 isert_put_cmd(isert_cmd, comp_err);
1614}
1615
1616static int
1617isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1618{
1619 struct ib_mr_status mr_status;
1620 int ret;
1621
1622 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1623 if (ret) {
1624 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1625 goto fail_mr_status;
1626 }
1627
1628 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1629 u64 sec_offset_err;
1630 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1631
1632 switch (mr_status.sig_err.err_type) {
1633 case IB_SIG_BAD_GUARD:
1634 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1635 break;
1636 case IB_SIG_BAD_REFTAG:
1637 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1638 break;
1639 case IB_SIG_BAD_APPTAG:
1640 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1641 break;
1642 }
1643 sec_offset_err = mr_status.sig_err.sig_err_offset;
1644 do_div(sec_offset_err, block_size);
1645 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1646
1647 isert_err("PI error found type %d at sector 0x%llx "
1648 "expected 0x%x vs actual 0x%x\n",
1649 mr_status.sig_err.err_type,
1650 (unsigned long long)se_cmd->bad_sector,
1651 mr_status.sig_err.expected,
1652 mr_status.sig_err.actual);
1653 ret = 1;
1654 }
1655
1656fail_mr_status:
1657 return ret;
1658}
1659
1660static void
1661isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1662{
1663 struct isert_conn *isert_conn = wc->qp->qp_context;
1664 struct isert_device *device = isert_conn->device;
1665 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1666 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1667 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1668 int ret = 0;
1669
1670 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1671 isert_print_wc(wc, "rdma write");
1672 if (wc->status != IB_WC_WR_FLUSH_ERR)
1673 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1674 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1675 return;
1676 }
1677
1678 isert_dbg("Cmd %p\n", isert_cmd);
1679
1680 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1681 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1682
1683 if (ret) {
1684 /*
1685 * transport_generic_request_failure() expects to have
1686 * plus two references to handle queue-full, so re-add
1687 * one here as target-core will have already dropped
1688 * it after the first isert_put_datain() callback.
1689 */
1690 kref_get(&cmd->cmd_kref);
1691 transport_generic_request_failure(cmd, cmd->pi_err);
1692 } else {
1693 /*
1694 * XXX: isert_put_response() failure is not retried.
1695 */
1696 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1697 if (ret)
1698 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1699 }
1700}
1701
1702static void
1703isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1704{
1705 struct isert_conn *isert_conn = wc->qp->qp_context;
1706 struct isert_device *device = isert_conn->device;
1707 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1708 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1709 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1710 struct se_cmd *se_cmd = &cmd->se_cmd;
1711 int ret = 0;
1712
1713 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1714 isert_print_wc(wc, "rdma read");
1715 if (wc->status != IB_WC_WR_FLUSH_ERR)
1716 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1717 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1718 return;
1719 }
1720
1721 isert_dbg("Cmd %p\n", isert_cmd);
1722
1723 iscsit_stop_dataout_timer(cmd);
1724
1725 if (isert_prot_cmd(isert_conn, se_cmd))
1726 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1727 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1728 cmd->write_data_done = 0;
1729
1730 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1731 spin_lock_bh(&cmd->istate_lock);
1732 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1733 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1734 spin_unlock_bh(&cmd->istate_lock);
1735
1736 /*
1737 * transport_generic_request_failure() will drop the extra
1738 * se_cmd->cmd_kref reference after T10-PI error, and handle
1739 * any non-zero ->queue_status() callback error retries.
1740 */
1741 if (ret)
1742 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1743 else
1744 target_execute_cmd(se_cmd);
1745}
1746
1747static void
1748isert_do_control_comp(struct work_struct *work)
1749{
1750 struct isert_cmd *isert_cmd = container_of(work,
1751 struct isert_cmd, comp_work);
1752 struct isert_conn *isert_conn = isert_cmd->conn;
1753 struct ib_device *ib_dev = isert_conn->cm_id->device;
1754 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1755
1756 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1757
1758 switch (cmd->i_state) {
1759 case ISTATE_SEND_TASKMGTRSP:
1760 iscsit_tmr_post_handler(cmd, cmd->conn);
1761 /* fall through */
1762 case ISTATE_SEND_REJECT:
1763 case ISTATE_SEND_TEXTRSP:
1764 cmd->i_state = ISTATE_SENT_STATUS;
1765 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1766 ib_dev, false);
1767 break;
1768 case ISTATE_SEND_LOGOUTRSP:
1769 iscsit_logout_post_handler(cmd, cmd->conn);
1770 break;
1771 default:
1772 isert_err("Unknown i_state %d\n", cmd->i_state);
1773 dump_stack();
1774 break;
1775 }
1776}
1777
1778static void
1779isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1780{
1781 struct isert_conn *isert_conn = wc->qp->qp_context;
1782 struct ib_device *ib_dev = isert_conn->cm_id->device;
1783 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1784
1785 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1786 isert_print_wc(wc, "login send");
1787 if (wc->status != IB_WC_WR_FLUSH_ERR)
1788 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1789 }
1790
1791 isert_unmap_tx_desc(tx_desc, ib_dev);
1792}
1793
1794static void
1795isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1796{
1797 struct isert_conn *isert_conn = wc->qp->qp_context;
1798 struct ib_device *ib_dev = isert_conn->cm_id->device;
1799 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1800 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1801
1802 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1803 isert_print_wc(wc, "send");
1804 if (wc->status != IB_WC_WR_FLUSH_ERR)
1805 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1806 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1807 return;
1808 }
1809
1810 isert_dbg("Cmd %p\n", isert_cmd);
1811
1812 switch (isert_cmd->iscsi_cmd->i_state) {
1813 case ISTATE_SEND_TASKMGTRSP:
1814 case ISTATE_SEND_LOGOUTRSP:
1815 case ISTATE_SEND_REJECT:
1816 case ISTATE_SEND_TEXTRSP:
1817 isert_unmap_tx_desc(tx_desc, ib_dev);
1818
1819 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1820 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1821 return;
1822 default:
1823 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1824 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1825 break;
1826 }
1827}
1828
1829static int
1830isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1831{
1832 int ret;
1833
1834 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1835 if (ret) {
1836 isert_err("ib_post_recv failed with %d\n", ret);
1837 return ret;
1838 }
1839
1840 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1841 if (ret) {
1842 isert_err("ib_post_send failed with %d\n", ret);
1843 return ret;
1844 }
1845 return ret;
1846}
1847
1848static int
1849isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1850{
1851 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1852 struct isert_conn *isert_conn = conn->context;
1853 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1854 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1855 &isert_cmd->tx_desc.iscsi_header;
1856
1857 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1858 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1859 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1860 /*
1861 * Attach SENSE DATA payload to iSCSI Response PDU
1862 */
1863 if (cmd->se_cmd.sense_buffer &&
1864 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1865 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1866 struct isert_device *device = isert_conn->device;
1867 struct ib_device *ib_dev = device->ib_device;
1868 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1869 u32 padding, pdu_len;
1870
1871 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1872 cmd->sense_buffer);
1873 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1874
1875 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1876 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1877 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1878
1879 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1880 (void *)cmd->sense_buffer, pdu_len,
1881 DMA_TO_DEVICE);
1882 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1883 return -ENOMEM;
1884
1885 isert_cmd->pdu_buf_len = pdu_len;
1886 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1887 tx_dsg->length = pdu_len;
1888 tx_dsg->lkey = device->pd->local_dma_lkey;
1889 isert_cmd->tx_desc.num_sge = 2;
1890 }
1891
1892 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1893
1894 isert_dbg("Posting SCSI Response\n");
1895
1896 return isert_post_response(isert_conn, isert_cmd);
1897}
1898
1899static void
1900isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1901{
1902 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1903 struct isert_conn *isert_conn = conn->context;
1904
1905 spin_lock_bh(&conn->cmd_lock);
1906 if (!list_empty(&cmd->i_conn_node))
1907 list_del_init(&cmd->i_conn_node);
1908 spin_unlock_bh(&conn->cmd_lock);
1909
1910 if (cmd->data_direction == DMA_TO_DEVICE)
1911 iscsit_stop_dataout_timer(cmd);
1912 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1913}
1914
1915static enum target_prot_op
1916isert_get_sup_prot_ops(struct iscsi_conn *conn)
1917{
1918 struct isert_conn *isert_conn = conn->context;
1919 struct isert_device *device = isert_conn->device;
1920
1921 if (conn->tpg->tpg_attrib.t10_pi) {
1922 if (device->pi_capable) {
1923 isert_info("conn %p PI offload enabled\n", isert_conn);
1924 isert_conn->pi_support = true;
1925 return TARGET_PROT_ALL;
1926 }
1927 }
1928
1929 isert_info("conn %p PI offload disabled\n", isert_conn);
1930 isert_conn->pi_support = false;
1931
1932 return TARGET_PROT_NORMAL;
1933}
1934
1935static int
1936isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1937 bool nopout_response)
1938{
1939 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1940 struct isert_conn *isert_conn = conn->context;
1941 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1942
1943 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1944 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1945 &isert_cmd->tx_desc.iscsi_header,
1946 nopout_response);
1947 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1948 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1949
1950 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1951
1952 return isert_post_response(isert_conn, isert_cmd);
1953}
1954
1955static int
1956isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1957{
1958 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1959 struct isert_conn *isert_conn = conn->context;
1960 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1961
1962 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1963 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1964 &isert_cmd->tx_desc.iscsi_header);
1965 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1966 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1967
1968 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1969
1970 return isert_post_response(isert_conn, isert_cmd);
1971}
1972
1973static int
1974isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1975{
1976 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1977 struct isert_conn *isert_conn = conn->context;
1978 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1979
1980 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1981 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1982 &isert_cmd->tx_desc.iscsi_header);
1983 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1984 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1985
1986 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1987
1988 return isert_post_response(isert_conn, isert_cmd);
1989}
1990
1991static int
1992isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1993{
1994 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1995 struct isert_conn *isert_conn = conn->context;
1996 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1997 struct isert_device *device = isert_conn->device;
1998 struct ib_device *ib_dev = device->ib_device;
1999 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2000 struct iscsi_reject *hdr =
2001 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2002
2003 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2004 iscsit_build_reject(cmd, conn, hdr);
2005 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2006
2007 hton24(hdr->dlength, ISCSI_HDR_LEN);
2008 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2009 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2010 DMA_TO_DEVICE);
2011 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2012 return -ENOMEM;
2013 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2014 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2015 tx_dsg->length = ISCSI_HDR_LEN;
2016 tx_dsg->lkey = device->pd->local_dma_lkey;
2017 isert_cmd->tx_desc.num_sge = 2;
2018
2019 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2020
2021 isert_dbg("conn %p Posting Reject\n", isert_conn);
2022
2023 return isert_post_response(isert_conn, isert_cmd);
2024}
2025
2026static int
2027isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2028{
2029 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2030 struct isert_conn *isert_conn = conn->context;
2031 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2032 struct iscsi_text_rsp *hdr =
2033 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2034 u32 txt_rsp_len;
2035 int rc;
2036
2037 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2038 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2039 if (rc < 0)
2040 return rc;
2041
2042 txt_rsp_len = rc;
2043 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2044
2045 if (txt_rsp_len) {
2046 struct isert_device *device = isert_conn->device;
2047 struct ib_device *ib_dev = device->ib_device;
2048 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2049 void *txt_rsp_buf = cmd->buf_ptr;
2050
2051 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2052 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2053 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2054 return -ENOMEM;
2055
2056 isert_cmd->pdu_buf_len = txt_rsp_len;
2057 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2058 tx_dsg->length = txt_rsp_len;
2059 tx_dsg->lkey = device->pd->local_dma_lkey;
2060 isert_cmd->tx_desc.num_sge = 2;
2061 }
2062 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2063
2064 isert_dbg("conn %p Text Response\n", isert_conn);
2065
2066 return isert_post_response(isert_conn, isert_cmd);
2067}
2068
2069static inline void
2070isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2071 struct ib_sig_domain *domain)
2072{
2073 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2074 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2075 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2076 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2077 /*
2078 * At the moment we hard code those, but if in the future
2079 * the target core would like to use it, we will take it
2080 * from se_cmd.
2081 */
2082 domain->sig.dif.apptag_check_mask = 0xffff;
2083 domain->sig.dif.app_escape = true;
2084 domain->sig.dif.ref_escape = true;
2085 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2086 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2087 domain->sig.dif.ref_remap = true;
2088};
2089
2090static int
2091isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2092{
2093 memset(sig_attrs, 0, sizeof(*sig_attrs));
2094
2095 switch (se_cmd->prot_op) {
2096 case TARGET_PROT_DIN_INSERT:
2097 case TARGET_PROT_DOUT_STRIP:
2098 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2099 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2100 break;
2101 case TARGET_PROT_DOUT_INSERT:
2102 case TARGET_PROT_DIN_STRIP:
2103 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2104 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2105 break;
2106 case TARGET_PROT_DIN_PASS:
2107 case TARGET_PROT_DOUT_PASS:
2108 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2109 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2110 break;
2111 default:
2112 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2113 return -EINVAL;
2114 }
2115
2116 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2117 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2118 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2119 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2120 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2121 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2122
2123 return 0;
2124}
2125
2126static int
2127isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2128 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2129{
2130 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2131 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2132 u8 port_num = conn->cm_id->port_num;
2133 u64 addr;
2134 u32 rkey, offset;
2135 int ret;
2136
2137 if (cmd->ctx_init_done)
2138 goto rdma_ctx_post;
2139
2140 if (dir == DMA_FROM_DEVICE) {
2141 addr = cmd->write_va;
2142 rkey = cmd->write_stag;
2143 offset = cmd->iscsi_cmd->write_data_done;
2144 } else {
2145 addr = cmd->read_va;
2146 rkey = cmd->read_stag;
2147 offset = 0;
2148 }
2149
2150 if (isert_prot_cmd(conn, se_cmd)) {
2151 struct ib_sig_attrs sig_attrs;
2152
2153 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2154 if (ret)
2155 return ret;
2156
2157 WARN_ON_ONCE(offset);
2158 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2159 se_cmd->t_data_sg, se_cmd->t_data_nents,
2160 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2161 &sig_attrs, addr, rkey, dir);
2162 } else {
2163 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2164 se_cmd->t_data_sg, se_cmd->t_data_nents,
2165 offset, addr, rkey, dir);
2166 }
2167
2168 if (ret < 0) {
2169 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2170 return ret;
2171 }
2172
2173 cmd->ctx_init_done = true;
2174
2175rdma_ctx_post:
2176 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2177 if (ret < 0)
2178 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2179 return ret;
2180}
2181
2182static int
2183isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2184{
2185 struct se_cmd *se_cmd = &cmd->se_cmd;
2186 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2187 struct isert_conn *isert_conn = conn->context;
2188 struct ib_cqe *cqe = NULL;
2189 struct ib_send_wr *chain_wr = NULL;
2190 int rc;
2191
2192 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2193 isert_cmd, se_cmd->data_length);
2194
2195 if (isert_prot_cmd(isert_conn, se_cmd)) {
2196 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2197 cqe = &isert_cmd->tx_desc.tx_cqe;
2198 } else {
2199 /*
2200 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2201 */
2202 isert_create_send_desc(isert_conn, isert_cmd,
2203 &isert_cmd->tx_desc);
2204 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2205 &isert_cmd->tx_desc.iscsi_header);
2206 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2207 isert_init_send_wr(isert_conn, isert_cmd,
2208 &isert_cmd->tx_desc.send_wr);
2209
2210 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2211 if (rc) {
2212 isert_err("ib_post_recv failed with %d\n", rc);
2213 return rc;
2214 }
2215
2216 chain_wr = &isert_cmd->tx_desc.send_wr;
2217 }
2218
2219 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2220 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2221 isert_cmd, rc);
2222 return rc;
2223}
2224
2225static int
2226isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2227{
2228 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2229 int ret;
2230
2231 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2232 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2233
2234 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2235 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2236 &isert_cmd->tx_desc.tx_cqe, NULL);
2237
2238 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2239 isert_cmd, ret);
2240 return ret;
2241}
2242
2243static int
2244isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2245{
2246 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2247 int ret = 0;
2248
2249 switch (state) {
2250 case ISTATE_REMOVE:
2251 spin_lock_bh(&conn->cmd_lock);
2252 list_del_init(&cmd->i_conn_node);
2253 spin_unlock_bh(&conn->cmd_lock);
2254 isert_put_cmd(isert_cmd, true);
2255 break;
2256 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2257 ret = isert_put_nopin(cmd, conn, false);
2258 break;
2259 default:
2260 isert_err("Unknown immediate state: 0x%02x\n", state);
2261 ret = -EINVAL;
2262 break;
2263 }
2264
2265 return ret;
2266}
2267
2268static int
2269isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2270{
2271 struct isert_conn *isert_conn = conn->context;
2272 int ret;
2273
2274 switch (state) {
2275 case ISTATE_SEND_LOGOUTRSP:
2276 ret = isert_put_logout_rsp(cmd, conn);
2277 if (!ret)
2278 isert_conn->logout_posted = true;
2279 break;
2280 case ISTATE_SEND_NOPIN:
2281 ret = isert_put_nopin(cmd, conn, true);
2282 break;
2283 case ISTATE_SEND_TASKMGTRSP:
2284 ret = isert_put_tm_rsp(cmd, conn);
2285 break;
2286 case ISTATE_SEND_REJECT:
2287 ret = isert_put_reject(cmd, conn);
2288 break;
2289 case ISTATE_SEND_TEXTRSP:
2290 ret = isert_put_text_rsp(cmd, conn);
2291 break;
2292 case ISTATE_SEND_STATUS:
2293 /*
2294 * Special case for sending non GOOD SCSI status from TX thread
2295 * context during pre se_cmd excecution failure.
2296 */
2297 ret = isert_put_response(conn, cmd);
2298 break;
2299 default:
2300 isert_err("Unknown response state: 0x%02x\n", state);
2301 ret = -EINVAL;
2302 break;
2303 }
2304
2305 return ret;
2306}
2307
2308struct rdma_cm_id *
2309isert_setup_id(struct isert_np *isert_np)
2310{
2311 struct iscsi_np *np = isert_np->np;
2312 struct rdma_cm_id *id;
2313 struct sockaddr *sa;
2314 int ret;
2315
2316 sa = (struct sockaddr *)&np->np_sockaddr;
2317 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2318
2319 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2320 RDMA_PS_TCP, IB_QPT_RC);
2321 if (IS_ERR(id)) {
2322 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2323 ret = PTR_ERR(id);
2324 goto out;
2325 }
2326 isert_dbg("id %p context %p\n", id, id->context);
2327
2328 ret = rdma_bind_addr(id, sa);
2329 if (ret) {
2330 isert_err("rdma_bind_addr() failed: %d\n", ret);
2331 goto out_id;
2332 }
2333
2334 ret = rdma_listen(id, 0);
2335 if (ret) {
2336 isert_err("rdma_listen() failed: %d\n", ret);
2337 goto out_id;
2338 }
2339
2340 return id;
2341out_id:
2342 rdma_destroy_id(id);
2343out:
2344 return ERR_PTR(ret);
2345}
2346
2347static int
2348isert_setup_np(struct iscsi_np *np,
2349 struct sockaddr_storage *ksockaddr)
2350{
2351 struct isert_np *isert_np;
2352 struct rdma_cm_id *isert_lid;
2353 int ret;
2354
2355 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2356 if (!isert_np)
2357 return -ENOMEM;
2358
2359 sema_init(&isert_np->sem, 0);
2360 mutex_init(&isert_np->mutex);
2361 INIT_LIST_HEAD(&isert_np->accepted);
2362 INIT_LIST_HEAD(&isert_np->pending);
2363 isert_np->np = np;
2364
2365 /*
2366 * Setup the np->np_sockaddr from the passed sockaddr setup
2367 * in iscsi_target_configfs.c code..
2368 */
2369 memcpy(&np->np_sockaddr, ksockaddr,
2370 sizeof(struct sockaddr_storage));
2371
2372 isert_lid = isert_setup_id(isert_np);
2373 if (IS_ERR(isert_lid)) {
2374 ret = PTR_ERR(isert_lid);
2375 goto out;
2376 }
2377
2378 isert_np->cm_id = isert_lid;
2379 np->np_context = isert_np;
2380
2381 return 0;
2382
2383out:
2384 kfree(isert_np);
2385
2386 return ret;
2387}
2388
2389static int
2390isert_rdma_accept(struct isert_conn *isert_conn)
2391{
2392 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2393 struct rdma_conn_param cp;
2394 int ret;
2395 struct iser_cm_hdr rsp_hdr;
2396
2397 memset(&cp, 0, sizeof(struct rdma_conn_param));
2398 cp.initiator_depth = isert_conn->initiator_depth;
2399 cp.retry_count = 7;
2400 cp.rnr_retry_count = 7;
2401
2402 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2403 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2404 if (!isert_conn->snd_w_inv)
2405 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2406 cp.private_data = (void *)&rsp_hdr;
2407 cp.private_data_len = sizeof(rsp_hdr);
2408
2409 ret = rdma_accept(cm_id, &cp);
2410 if (ret) {
2411 isert_err("rdma_accept() failed with: %d\n", ret);
2412 return ret;
2413 }
2414
2415 return 0;
2416}
2417
2418static int
2419isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2420{
2421 struct isert_conn *isert_conn = conn->context;
2422 int ret;
2423
2424 isert_info("before login_req comp conn: %p\n", isert_conn);
2425 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2426 if (ret) {
2427 isert_err("isert_conn %p interrupted before got login req\n",
2428 isert_conn);
2429 return ret;
2430 }
2431 reinit_completion(&isert_conn->login_req_comp);
2432
2433 /*
2434 * For login requests after the first PDU, isert_rx_login_req() will
2435 * kick schedule_delayed_work(&conn->login_work) as the packet is
2436 * received, which turns this callback from iscsi_target_do_login_rx()
2437 * into a NOP.
2438 */
2439 if (!login->first_request)
2440 return 0;
2441
2442 isert_rx_login_req(isert_conn);
2443
2444 isert_info("before login_comp conn: %p\n", conn);
2445 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2446 if (ret)
2447 return ret;
2448
2449 isert_info("processing login->req: %p\n", login->req);
2450
2451 return 0;
2452}
2453
2454static void
2455isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2456 struct isert_conn *isert_conn)
2457{
2458 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2459 struct rdma_route *cm_route = &cm_id->route;
2460
2461 conn->login_family = np->np_sockaddr.ss_family;
2462
2463 conn->login_sockaddr = cm_route->addr.dst_addr;
2464 conn->local_sockaddr = cm_route->addr.src_addr;
2465}
2466
2467static int
2468isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2469{
2470 struct isert_np *isert_np = np->np_context;
2471 struct isert_conn *isert_conn;
2472 int ret;
2473
2474accept_wait:
2475 ret = down_interruptible(&isert_np->sem);
2476 if (ret)
2477 return -ENODEV;
2478
2479 spin_lock_bh(&np->np_thread_lock);
2480 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2481 spin_unlock_bh(&np->np_thread_lock);
2482 isert_dbg("np_thread_state %d\n",
2483 np->np_thread_state);
2484 /**
2485 * No point in stalling here when np_thread
2486 * is in state RESET/SHUTDOWN/EXIT - bail
2487 **/
2488 return -ENODEV;
2489 }
2490 spin_unlock_bh(&np->np_thread_lock);
2491
2492 mutex_lock(&isert_np->mutex);
2493 if (list_empty(&isert_np->pending)) {
2494 mutex_unlock(&isert_np->mutex);
2495 goto accept_wait;
2496 }
2497 isert_conn = list_first_entry(&isert_np->pending,
2498 struct isert_conn, node);
2499 list_del_init(&isert_conn->node);
2500 mutex_unlock(&isert_np->mutex);
2501
2502 conn->context = isert_conn;
2503 isert_conn->conn = conn;
2504 isert_conn->state = ISER_CONN_BOUND;
2505
2506 isert_set_conn_info(np, conn, isert_conn);
2507
2508 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2509
2510 return 0;
2511}
2512
2513static void
2514isert_free_np(struct iscsi_np *np)
2515{
2516 struct isert_np *isert_np = np->np_context;
2517 struct isert_conn *isert_conn, *n;
2518
2519 if (isert_np->cm_id)
2520 rdma_destroy_id(isert_np->cm_id);
2521
2522 /*
2523 * FIXME: At this point we don't have a good way to insure
2524 * that at this point we don't have hanging connections that
2525 * completed RDMA establishment but didn't start iscsi login
2526 * process. So work-around this by cleaning up what ever piled
2527 * up in accepted and pending lists.
2528 */
2529 mutex_lock(&isert_np->mutex);
2530 if (!list_empty(&isert_np->pending)) {
2531 isert_info("Still have isert pending connections\n");
2532 list_for_each_entry_safe(isert_conn, n,
2533 &isert_np->pending,
2534 node) {
2535 isert_info("cleaning isert_conn %p state (%d)\n",
2536 isert_conn, isert_conn->state);
2537 isert_connect_release(isert_conn);
2538 }
2539 }
2540
2541 if (!list_empty(&isert_np->accepted)) {
2542 isert_info("Still have isert accepted connections\n");
2543 list_for_each_entry_safe(isert_conn, n,
2544 &isert_np->accepted,
2545 node) {
2546 isert_info("cleaning isert_conn %p state (%d)\n",
2547 isert_conn, isert_conn->state);
2548 isert_connect_release(isert_conn);
2549 }
2550 }
2551 mutex_unlock(&isert_np->mutex);
2552
2553 np->np_context = NULL;
2554 kfree(isert_np);
2555}
2556
2557static void isert_release_work(struct work_struct *work)
2558{
2559 struct isert_conn *isert_conn = container_of(work,
2560 struct isert_conn,
2561 release_work);
2562
2563 isert_info("Starting release conn %p\n", isert_conn);
2564
2565 mutex_lock(&isert_conn->mutex);
2566 isert_conn->state = ISER_CONN_DOWN;
2567 mutex_unlock(&isert_conn->mutex);
2568
2569 isert_info("Destroying conn %p\n", isert_conn);
2570 isert_put_conn(isert_conn);
2571}
2572
2573static void
2574isert_wait4logout(struct isert_conn *isert_conn)
2575{
2576 struct iscsi_conn *conn = isert_conn->conn;
2577
2578 isert_info("conn %p\n", isert_conn);
2579
2580 if (isert_conn->logout_posted) {
2581 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2582 wait_for_completion_timeout(&conn->conn_logout_comp,
2583 SECONDS_FOR_LOGOUT_COMP * HZ);
2584 }
2585}
2586
2587static void
2588isert_wait4cmds(struct iscsi_conn *conn)
2589{
2590 isert_info("iscsi_conn %p\n", conn);
2591
2592 if (conn->sess) {
2593 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2594 target_wait_for_sess_cmds(conn->sess->se_sess);
2595 }
2596}
2597
2598/**
2599 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2600 * unsolicitate dataout
2601 * @conn: iscsi connection
2602 *
2603 * We might still have commands that are waiting for unsolicited
2604 * dataouts messages. We must put the extra reference on those
2605 * before blocking on the target_wait_for_session_cmds
2606 */
2607static void
2608isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2609{
2610 struct iscsi_cmd *cmd, *tmp;
2611 static LIST_HEAD(drop_cmd_list);
2612
2613 spin_lock_bh(&conn->cmd_lock);
2614 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2615 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2616 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2617 (cmd->write_data_done < cmd->se_cmd.data_length))
2618 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2619 }
2620 spin_unlock_bh(&conn->cmd_lock);
2621
2622 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2623 list_del_init(&cmd->i_conn_node);
2624 if (cmd->i_state != ISTATE_REMOVE) {
2625 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2626
2627 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2628 isert_put_cmd(isert_cmd, true);
2629 }
2630 }
2631}
2632
2633static void isert_wait_conn(struct iscsi_conn *conn)
2634{
2635 struct isert_conn *isert_conn = conn->context;
2636
2637 isert_info("Starting conn %p\n", isert_conn);
2638
2639 mutex_lock(&isert_conn->mutex);
2640 isert_conn_terminate(isert_conn);
2641 mutex_unlock(&isert_conn->mutex);
2642
2643 ib_drain_qp(isert_conn->qp);
2644 isert_put_unsol_pending_cmds(conn);
2645 isert_wait4cmds(conn);
2646 isert_wait4logout(isert_conn);
2647
2648 queue_work(isert_release_wq, &isert_conn->release_work);
2649}
2650
2651static void isert_free_conn(struct iscsi_conn *conn)
2652{
2653 struct isert_conn *isert_conn = conn->context;
2654
2655 ib_drain_qp(isert_conn->qp);
2656 isert_put_conn(isert_conn);
2657}
2658
2659static void isert_get_rx_pdu(struct iscsi_conn *conn)
2660{
2661 struct completion comp;
2662
2663 init_completion(&comp);
2664
2665 wait_for_completion_interruptible(&comp);
2666}
2667
2668static struct iscsit_transport iser_target_transport = {
2669 .name = "IB/iSER",
2670 .transport_type = ISCSI_INFINIBAND,
2671 .rdma_shutdown = true,
2672 .priv_size = sizeof(struct isert_cmd),
2673 .owner = THIS_MODULE,
2674 .iscsit_setup_np = isert_setup_np,
2675 .iscsit_accept_np = isert_accept_np,
2676 .iscsit_free_np = isert_free_np,
2677 .iscsit_wait_conn = isert_wait_conn,
2678 .iscsit_free_conn = isert_free_conn,
2679 .iscsit_get_login_rx = isert_get_login_rx,
2680 .iscsit_put_login_tx = isert_put_login_tx,
2681 .iscsit_immediate_queue = isert_immediate_queue,
2682 .iscsit_response_queue = isert_response_queue,
2683 .iscsit_get_dataout = isert_get_dataout,
2684 .iscsit_queue_data_in = isert_put_datain,
2685 .iscsit_queue_status = isert_put_response,
2686 .iscsit_aborted_task = isert_aborted_task,
2687 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2688 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2689};
2690
2691static int __init isert_init(void)
2692{
2693 int ret;
2694
2695 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2696 WQ_UNBOUND | WQ_HIGHPRI, 0);
2697 if (!isert_comp_wq) {
2698 isert_err("Unable to allocate isert_comp_wq\n");
2699 return -ENOMEM;
2700 }
2701
2702 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2703 WQ_UNBOUND_MAX_ACTIVE);
2704 if (!isert_release_wq) {
2705 isert_err("Unable to allocate isert_release_wq\n");
2706 ret = -ENOMEM;
2707 goto destroy_comp_wq;
2708 }
2709
2710 iscsit_register_transport(&iser_target_transport);
2711 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2712
2713 return 0;
2714
2715destroy_comp_wq:
2716 destroy_workqueue(isert_comp_wq);
2717
2718 return ret;
2719}
2720
2721static void __exit isert_exit(void)
2722{
2723 flush_scheduled_work();
2724 destroy_workqueue(isert_release_wq);
2725 destroy_workqueue(isert_comp_wq);
2726 iscsit_unregister_transport(&iser_target_transport);
2727 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2728}
2729
2730MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2731MODULE_AUTHOR("nab@Linux-iSCSI.org");
2732MODULE_LICENSE("GPL");
2733
2734module_init(isert_init);
2735module_exit(isert_exit);
2736