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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[mirror_ubuntu-zesty-kernel.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
23 #include <linux/in.h>
24 #include <linux/in6.h>
25 #include <rdma/ib_verbs.h>
26 #include <rdma/rdma_cm.h>
27 #include <target/target_core_base.h>
28 #include <target/target_core_fabric.h>
29 #include <target/iscsi/iscsi_transport.h>
30 #include <linux/semaphore.h>
31
32 #include "isert_proto.h"
33 #include "ib_isert.h"
34
35 #define ISERT_MAX_CONN 8
36 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
37 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
38 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
39 ISERT_MAX_CONN)
40
41 static int isert_debug_level;
42 module_param_named(debug_level, isert_debug_level, int, 0644);
43 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
44
45 static DEFINE_MUTEX(device_list_mutex);
46 static LIST_HEAD(device_list);
47 static struct workqueue_struct *isert_comp_wq;
48 static struct workqueue_struct *isert_release_wq;
49
50 static void
51 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
52 static int
53 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
54 struct isert_rdma_wr *wr);
55 static void
56 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
57 static int
58 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
59 struct isert_rdma_wr *wr);
60 static int
61 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
62 static int
63 isert_rdma_post_recvl(struct isert_conn *isert_conn);
64 static int
65 isert_rdma_accept(struct isert_conn *isert_conn);
66 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
67
68 static void isert_release_work(struct work_struct *work);
69
70 static inline bool
71 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
72 {
73 return (conn->pi_support &&
74 cmd->prot_op != TARGET_PROT_NORMAL);
75 }
76
77
78 static void
79 isert_qp_event_callback(struct ib_event *e, void *context)
80 {
81 struct isert_conn *isert_conn = context;
82
83 isert_err("%s (%d): conn %p\n",
84 ib_event_msg(e->event), e->event, isert_conn);
85
86 switch (e->event) {
87 case IB_EVENT_COMM_EST:
88 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
89 break;
90 case IB_EVENT_QP_LAST_WQE_REACHED:
91 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
92 break;
93 default:
94 break;
95 }
96 }
97
98 static int
99 isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
100 {
101 int ret;
102
103 ret = ib_query_device(ib_dev, devattr);
104 if (ret) {
105 isert_err("ib_query_device() failed: %d\n", ret);
106 return ret;
107 }
108 isert_dbg("devattr->max_sge: %d\n", devattr->max_sge);
109 isert_dbg("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
110
111 return 0;
112 }
113
114 static struct isert_comp *
115 isert_comp_get(struct isert_conn *isert_conn)
116 {
117 struct isert_device *device = isert_conn->device;
118 struct isert_comp *comp;
119 int i, min = 0;
120
121 mutex_lock(&device_list_mutex);
122 for (i = 0; i < device->comps_used; i++)
123 if (device->comps[i].active_qps <
124 device->comps[min].active_qps)
125 min = i;
126 comp = &device->comps[min];
127 comp->active_qps++;
128 mutex_unlock(&device_list_mutex);
129
130 isert_info("conn %p, using comp %p min_index: %d\n",
131 isert_conn, comp, min);
132
133 return comp;
134 }
135
136 static void
137 isert_comp_put(struct isert_comp *comp)
138 {
139 mutex_lock(&device_list_mutex);
140 comp->active_qps--;
141 mutex_unlock(&device_list_mutex);
142 }
143
144 static struct ib_qp *
145 isert_create_qp(struct isert_conn *isert_conn,
146 struct isert_comp *comp,
147 struct rdma_cm_id *cma_id)
148 {
149 struct isert_device *device = isert_conn->device;
150 struct ib_qp_init_attr attr;
151 int ret;
152
153 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
154 attr.event_handler = isert_qp_event_callback;
155 attr.qp_context = isert_conn;
156 attr.send_cq = comp->cq;
157 attr.recv_cq = comp->cq;
158 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
159 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
160 /*
161 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
162 * work-around for RDMA_READs with ConnectX-2.
163 *
164 * Also, still make sure to have at least two SGEs for
165 * outgoing control PDU responses.
166 */
167 attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
168 isert_conn->max_sge = attr.cap.max_send_sge;
169
170 attr.cap.max_recv_sge = 1;
171 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
172 attr.qp_type = IB_QPT_RC;
173 if (device->pi_capable)
174 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
175
176 ret = rdma_create_qp(cma_id, device->pd, &attr);
177 if (ret) {
178 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
179 return ERR_PTR(ret);
180 }
181
182 return cma_id->qp;
183 }
184
185 static int
186 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
187 {
188 struct isert_comp *comp;
189 int ret;
190
191 comp = isert_comp_get(isert_conn);
192 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
193 if (IS_ERR(isert_conn->qp)) {
194 ret = PTR_ERR(isert_conn->qp);
195 goto err;
196 }
197
198 return 0;
199 err:
200 isert_comp_put(comp);
201 return ret;
202 }
203
204 static void
205 isert_cq_event_callback(struct ib_event *e, void *context)
206 {
207 isert_dbg("event: %d\n", e->event);
208 }
209
210 static int
211 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
212 {
213 struct isert_device *device = isert_conn->device;
214 struct ib_device *ib_dev = device->ib_device;
215 struct iser_rx_desc *rx_desc;
216 struct ib_sge *rx_sg;
217 u64 dma_addr;
218 int i, j;
219
220 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
221 sizeof(struct iser_rx_desc), GFP_KERNEL);
222 if (!isert_conn->rx_descs)
223 goto fail;
224
225 rx_desc = isert_conn->rx_descs;
226
227 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
228 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
229 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
230 if (ib_dma_mapping_error(ib_dev, dma_addr))
231 goto dma_map_fail;
232
233 rx_desc->dma_addr = dma_addr;
234
235 rx_sg = &rx_desc->rx_sg;
236 rx_sg->addr = rx_desc->dma_addr;
237 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
238 rx_sg->lkey = device->pd->local_dma_lkey;
239 }
240
241 isert_conn->rx_desc_head = 0;
242
243 return 0;
244
245 dma_map_fail:
246 rx_desc = isert_conn->rx_descs;
247 for (j = 0; j < i; j++, rx_desc++) {
248 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
249 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
250 }
251 kfree(isert_conn->rx_descs);
252 isert_conn->rx_descs = NULL;
253 fail:
254 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
255
256 return -ENOMEM;
257 }
258
259 static void
260 isert_free_rx_descriptors(struct isert_conn *isert_conn)
261 {
262 struct ib_device *ib_dev = isert_conn->device->ib_device;
263 struct iser_rx_desc *rx_desc;
264 int i;
265
266 if (!isert_conn->rx_descs)
267 return;
268
269 rx_desc = isert_conn->rx_descs;
270 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
271 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
272 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
273 }
274
275 kfree(isert_conn->rx_descs);
276 isert_conn->rx_descs = NULL;
277 }
278
279 static void isert_cq_work(struct work_struct *);
280 static void isert_cq_callback(struct ib_cq *, void *);
281
282 static void
283 isert_free_comps(struct isert_device *device)
284 {
285 int i;
286
287 for (i = 0; i < device->comps_used; i++) {
288 struct isert_comp *comp = &device->comps[i];
289
290 if (comp->cq) {
291 cancel_work_sync(&comp->work);
292 ib_destroy_cq(comp->cq);
293 }
294 }
295 kfree(device->comps);
296 }
297
298 static int
299 isert_alloc_comps(struct isert_device *device,
300 struct ib_device_attr *attr)
301 {
302 int i, max_cqe, ret = 0;
303
304 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
305 device->ib_device->num_comp_vectors));
306
307 isert_info("Using %d CQs, %s supports %d vectors support "
308 "Fast registration %d pi_capable %d\n",
309 device->comps_used, device->ib_device->name,
310 device->ib_device->num_comp_vectors, device->use_fastreg,
311 device->pi_capable);
312
313 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
314 GFP_KERNEL);
315 if (!device->comps) {
316 isert_err("Unable to allocate completion contexts\n");
317 return -ENOMEM;
318 }
319
320 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
321
322 for (i = 0; i < device->comps_used; i++) {
323 struct ib_cq_init_attr cq_attr = {};
324 struct isert_comp *comp = &device->comps[i];
325
326 comp->device = device;
327 INIT_WORK(&comp->work, isert_cq_work);
328 cq_attr.cqe = max_cqe;
329 cq_attr.comp_vector = i;
330 comp->cq = ib_create_cq(device->ib_device,
331 isert_cq_callback,
332 isert_cq_event_callback,
333 (void *)comp,
334 &cq_attr);
335 if (IS_ERR(comp->cq)) {
336 isert_err("Unable to allocate cq\n");
337 ret = PTR_ERR(comp->cq);
338 comp->cq = NULL;
339 goto out_cq;
340 }
341
342 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
343 if (ret)
344 goto out_cq;
345 }
346
347 return 0;
348 out_cq:
349 isert_free_comps(device);
350 return ret;
351 }
352
353 static int
354 isert_create_device_ib_res(struct isert_device *device)
355 {
356 struct ib_device_attr *dev_attr;
357 int ret;
358
359 dev_attr = &device->dev_attr;
360 ret = isert_query_device(device->ib_device, dev_attr);
361 if (ret)
362 return ret;
363
364 /* asign function handlers */
365 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
366 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
367 device->use_fastreg = 1;
368 device->reg_rdma_mem = isert_reg_rdma;
369 device->unreg_rdma_mem = isert_unreg_rdma;
370 } else {
371 device->use_fastreg = 0;
372 device->reg_rdma_mem = isert_map_rdma;
373 device->unreg_rdma_mem = isert_unmap_cmd;
374 }
375
376 ret = isert_alloc_comps(device, dev_attr);
377 if (ret)
378 return ret;
379
380 device->pd = ib_alloc_pd(device->ib_device);
381 if (IS_ERR(device->pd)) {
382 ret = PTR_ERR(device->pd);
383 isert_err("failed to allocate pd, device %p, ret=%d\n",
384 device, ret);
385 goto out_cq;
386 }
387
388 /* Check signature cap */
389 device->pi_capable = dev_attr->device_cap_flags &
390 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
391
392 return 0;
393
394 out_cq:
395 isert_free_comps(device);
396 return ret;
397 }
398
399 static void
400 isert_free_device_ib_res(struct isert_device *device)
401 {
402 isert_info("device %p\n", device);
403
404 ib_dealloc_pd(device->pd);
405 isert_free_comps(device);
406 }
407
408 static void
409 isert_device_put(struct isert_device *device)
410 {
411 mutex_lock(&device_list_mutex);
412 device->refcount--;
413 isert_info("device %p refcount %d\n", device, device->refcount);
414 if (!device->refcount) {
415 isert_free_device_ib_res(device);
416 list_del(&device->dev_node);
417 kfree(device);
418 }
419 mutex_unlock(&device_list_mutex);
420 }
421
422 static struct isert_device *
423 isert_device_get(struct rdma_cm_id *cma_id)
424 {
425 struct isert_device *device;
426 int ret;
427
428 mutex_lock(&device_list_mutex);
429 list_for_each_entry(device, &device_list, dev_node) {
430 if (device->ib_device->node_guid == cma_id->device->node_guid) {
431 device->refcount++;
432 isert_info("Found iser device %p refcount %d\n",
433 device, device->refcount);
434 mutex_unlock(&device_list_mutex);
435 return device;
436 }
437 }
438
439 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
440 if (!device) {
441 mutex_unlock(&device_list_mutex);
442 return ERR_PTR(-ENOMEM);
443 }
444
445 INIT_LIST_HEAD(&device->dev_node);
446
447 device->ib_device = cma_id->device;
448 ret = isert_create_device_ib_res(device);
449 if (ret) {
450 kfree(device);
451 mutex_unlock(&device_list_mutex);
452 return ERR_PTR(ret);
453 }
454
455 device->refcount++;
456 list_add_tail(&device->dev_node, &device_list);
457 isert_info("Created a new iser device %p refcount %d\n",
458 device, device->refcount);
459 mutex_unlock(&device_list_mutex);
460
461 return device;
462 }
463
464 static void
465 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
466 {
467 struct fast_reg_descriptor *fr_desc, *tmp;
468 int i = 0;
469
470 if (list_empty(&isert_conn->fr_pool))
471 return;
472
473 isert_info("Freeing conn %p fastreg pool", isert_conn);
474
475 list_for_each_entry_safe(fr_desc, tmp,
476 &isert_conn->fr_pool, list) {
477 list_del(&fr_desc->list);
478 ib_free_fast_reg_page_list(fr_desc->data_frpl);
479 ib_dereg_mr(fr_desc->data_mr);
480 if (fr_desc->pi_ctx) {
481 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
482 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
483 ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
484 kfree(fr_desc->pi_ctx);
485 }
486 kfree(fr_desc);
487 ++i;
488 }
489
490 if (i < isert_conn->fr_pool_size)
491 isert_warn("Pool still has %d regions registered\n",
492 isert_conn->fr_pool_size - i);
493 }
494
495 static int
496 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
497 struct ib_device *device,
498 struct ib_pd *pd)
499 {
500 struct pi_context *pi_ctx;
501 int ret;
502
503 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
504 if (!pi_ctx) {
505 isert_err("Failed to allocate pi context\n");
506 return -ENOMEM;
507 }
508
509 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
510 ISCSI_ISER_SG_TABLESIZE);
511 if (IS_ERR(pi_ctx->prot_frpl)) {
512 isert_err("Failed to allocate prot frpl err=%ld\n",
513 PTR_ERR(pi_ctx->prot_frpl));
514 ret = PTR_ERR(pi_ctx->prot_frpl);
515 goto err_pi_ctx;
516 }
517
518 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
519 ISCSI_ISER_SG_TABLESIZE);
520 if (IS_ERR(pi_ctx->prot_mr)) {
521 isert_err("Failed to allocate prot frmr err=%ld\n",
522 PTR_ERR(pi_ctx->prot_mr));
523 ret = PTR_ERR(pi_ctx->prot_mr);
524 goto err_prot_frpl;
525 }
526 desc->ind |= ISERT_PROT_KEY_VALID;
527
528 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
529 if (IS_ERR(pi_ctx->sig_mr)) {
530 isert_err("Failed to allocate signature enabled mr err=%ld\n",
531 PTR_ERR(pi_ctx->sig_mr));
532 ret = PTR_ERR(pi_ctx->sig_mr);
533 goto err_prot_mr;
534 }
535
536 desc->pi_ctx = pi_ctx;
537 desc->ind |= ISERT_SIG_KEY_VALID;
538 desc->ind &= ~ISERT_PROTECTED;
539
540 return 0;
541
542 err_prot_mr:
543 ib_dereg_mr(pi_ctx->prot_mr);
544 err_prot_frpl:
545 ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
546 err_pi_ctx:
547 kfree(pi_ctx);
548
549 return ret;
550 }
551
552 static int
553 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
554 struct fast_reg_descriptor *fr_desc)
555 {
556 int ret;
557
558 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
559 ISCSI_ISER_SG_TABLESIZE);
560 if (IS_ERR(fr_desc->data_frpl)) {
561 isert_err("Failed to allocate data frpl err=%ld\n",
562 PTR_ERR(fr_desc->data_frpl));
563 return PTR_ERR(fr_desc->data_frpl);
564 }
565
566 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
567 ISCSI_ISER_SG_TABLESIZE);
568 if (IS_ERR(fr_desc->data_mr)) {
569 isert_err("Failed to allocate data frmr err=%ld\n",
570 PTR_ERR(fr_desc->data_mr));
571 ret = PTR_ERR(fr_desc->data_mr);
572 goto err_data_frpl;
573 }
574 fr_desc->ind |= ISERT_DATA_KEY_VALID;
575
576 isert_dbg("Created fr_desc %p\n", fr_desc);
577
578 return 0;
579
580 err_data_frpl:
581 ib_free_fast_reg_page_list(fr_desc->data_frpl);
582
583 return ret;
584 }
585
586 static int
587 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
588 {
589 struct fast_reg_descriptor *fr_desc;
590 struct isert_device *device = isert_conn->device;
591 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
592 struct se_node_acl *se_nacl = se_sess->se_node_acl;
593 int i, ret, tag_num;
594 /*
595 * Setup the number of FRMRs based upon the number of tags
596 * available to session in iscsi_target_locate_portal().
597 */
598 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
599 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
600
601 isert_conn->fr_pool_size = 0;
602 for (i = 0; i < tag_num; i++) {
603 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
604 if (!fr_desc) {
605 isert_err("Failed to allocate fast_reg descriptor\n");
606 ret = -ENOMEM;
607 goto err;
608 }
609
610 ret = isert_create_fr_desc(device->ib_device,
611 device->pd, fr_desc);
612 if (ret) {
613 isert_err("Failed to create fastreg descriptor err=%d\n",
614 ret);
615 kfree(fr_desc);
616 goto err;
617 }
618
619 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
620 isert_conn->fr_pool_size++;
621 }
622
623 isert_dbg("Creating conn %p fastreg pool size=%d",
624 isert_conn, isert_conn->fr_pool_size);
625
626 return 0;
627
628 err:
629 isert_conn_free_fastreg_pool(isert_conn);
630 return ret;
631 }
632
633 static void
634 isert_init_conn(struct isert_conn *isert_conn)
635 {
636 isert_conn->state = ISER_CONN_INIT;
637 INIT_LIST_HEAD(&isert_conn->accept_node);
638 init_completion(&isert_conn->login_comp);
639 init_completion(&isert_conn->login_req_comp);
640 init_completion(&isert_conn->wait);
641 kref_init(&isert_conn->kref);
642 mutex_init(&isert_conn->mutex);
643 spin_lock_init(&isert_conn->pool_lock);
644 INIT_LIST_HEAD(&isert_conn->fr_pool);
645 INIT_WORK(&isert_conn->release_work, isert_release_work);
646 }
647
648 static void
649 isert_free_login_buf(struct isert_conn *isert_conn)
650 {
651 struct ib_device *ib_dev = isert_conn->device->ib_device;
652
653 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
654 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
655 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
656 ISCSI_DEF_MAX_RECV_SEG_LEN,
657 DMA_FROM_DEVICE);
658 kfree(isert_conn->login_buf);
659 }
660
661 static int
662 isert_alloc_login_buf(struct isert_conn *isert_conn,
663 struct ib_device *ib_dev)
664 {
665 int ret;
666
667 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
668 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
669 if (!isert_conn->login_buf) {
670 isert_err("Unable to allocate isert_conn->login_buf\n");
671 return -ENOMEM;
672 }
673
674 isert_conn->login_req_buf = isert_conn->login_buf;
675 isert_conn->login_rsp_buf = isert_conn->login_buf +
676 ISCSI_DEF_MAX_RECV_SEG_LEN;
677
678 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
679 isert_conn->login_buf, isert_conn->login_req_buf,
680 isert_conn->login_rsp_buf);
681
682 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
683 (void *)isert_conn->login_req_buf,
684 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
685
686 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
687 if (ret) {
688 isert_err("login_req_dma mapping error: %d\n", ret);
689 isert_conn->login_req_dma = 0;
690 goto out_login_buf;
691 }
692
693 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
694 (void *)isert_conn->login_rsp_buf,
695 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
696
697 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
698 if (ret) {
699 isert_err("login_rsp_dma mapping error: %d\n", ret);
700 isert_conn->login_rsp_dma = 0;
701 goto out_req_dma_map;
702 }
703
704 return 0;
705
706 out_req_dma_map:
707 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
708 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
709 out_login_buf:
710 kfree(isert_conn->login_buf);
711 return ret;
712 }
713
714 static int
715 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
716 {
717 struct isert_np *isert_np = cma_id->context;
718 struct iscsi_np *np = isert_np->np;
719 struct isert_conn *isert_conn;
720 struct isert_device *device;
721 int ret = 0;
722
723 spin_lock_bh(&np->np_thread_lock);
724 if (!np->enabled) {
725 spin_unlock_bh(&np->np_thread_lock);
726 isert_dbg("iscsi_np is not enabled, reject connect request\n");
727 return rdma_reject(cma_id, NULL, 0);
728 }
729 spin_unlock_bh(&np->np_thread_lock);
730
731 isert_dbg("cma_id: %p, portal: %p\n",
732 cma_id, cma_id->context);
733
734 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
735 if (!isert_conn)
736 return -ENOMEM;
737
738 isert_init_conn(isert_conn);
739 isert_conn->cm_id = cma_id;
740
741 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
742 if (ret)
743 goto out;
744
745 device = isert_device_get(cma_id);
746 if (IS_ERR(device)) {
747 ret = PTR_ERR(device);
748 goto out_rsp_dma_map;
749 }
750 isert_conn->device = device;
751
752 /* Set max inflight RDMA READ requests */
753 isert_conn->initiator_depth = min_t(u8,
754 event->param.conn.initiator_depth,
755 device->dev_attr.max_qp_init_rd_atom);
756 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
757
758 ret = isert_conn_setup_qp(isert_conn, cma_id);
759 if (ret)
760 goto out_conn_dev;
761
762 ret = isert_rdma_post_recvl(isert_conn);
763 if (ret)
764 goto out_conn_dev;
765 /*
766 * Obtain the second reference now before isert_rdma_accept() to
767 * ensure that any initiator generated REJECT CM event that occurs
768 * asynchronously won't drop the last reference until the error path
769 * in iscsi_target_login_sess_out() does it's ->iscsit_free_conn() ->
770 * isert_free_conn() -> isert_put_conn() -> kref_put().
771 */
772 if (!kref_get_unless_zero(&isert_conn->kref)) {
773 isert_warn("conn %p connect_release is running\n", isert_conn);
774 goto out_conn_dev;
775 }
776
777 ret = isert_rdma_accept(isert_conn);
778 if (ret)
779 goto out_conn_dev;
780
781 mutex_lock(&isert_np->np_accept_mutex);
782 list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list);
783 mutex_unlock(&isert_np->np_accept_mutex);
784
785 isert_info("np %p: Allow accept_np to continue\n", np);
786 up(&isert_np->np_sem);
787 return 0;
788
789 out_conn_dev:
790 isert_device_put(device);
791 out_rsp_dma_map:
792 isert_free_login_buf(isert_conn);
793 out:
794 kfree(isert_conn);
795 rdma_reject(cma_id, NULL, 0);
796 return ret;
797 }
798
799 static void
800 isert_connect_release(struct isert_conn *isert_conn)
801 {
802 struct isert_device *device = isert_conn->device;
803
804 isert_dbg("conn %p\n", isert_conn);
805
806 BUG_ON(!device);
807
808 if (device->use_fastreg)
809 isert_conn_free_fastreg_pool(isert_conn);
810
811 isert_free_rx_descriptors(isert_conn);
812 if (isert_conn->cm_id)
813 rdma_destroy_id(isert_conn->cm_id);
814
815 if (isert_conn->qp) {
816 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
817
818 isert_comp_put(comp);
819 ib_destroy_qp(isert_conn->qp);
820 }
821
822 if (isert_conn->login_buf)
823 isert_free_login_buf(isert_conn);
824
825 isert_device_put(device);
826
827 kfree(isert_conn);
828 }
829
830 static void
831 isert_connected_handler(struct rdma_cm_id *cma_id)
832 {
833 struct isert_conn *isert_conn = cma_id->qp->qp_context;
834
835 isert_info("conn %p\n", isert_conn);
836
837 mutex_lock(&isert_conn->mutex);
838 if (isert_conn->state != ISER_CONN_FULL_FEATURE)
839 isert_conn->state = ISER_CONN_UP;
840 mutex_unlock(&isert_conn->mutex);
841 }
842
843 static void
844 isert_release_kref(struct kref *kref)
845 {
846 struct isert_conn *isert_conn = container_of(kref,
847 struct isert_conn, kref);
848
849 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
850 current->pid);
851
852 isert_connect_release(isert_conn);
853 }
854
855 static void
856 isert_put_conn(struct isert_conn *isert_conn)
857 {
858 kref_put(&isert_conn->kref, isert_release_kref);
859 }
860
861 /**
862 * isert_conn_terminate() - Initiate connection termination
863 * @isert_conn: isert connection struct
864 *
865 * Notes:
866 * In case the connection state is FULL_FEATURE, move state
867 * to TEMINATING and start teardown sequence (rdma_disconnect).
868 * In case the connection state is UP, complete flush as well.
869 *
870 * This routine must be called with mutex held. Thus it is
871 * safe to call multiple times.
872 */
873 static void
874 isert_conn_terminate(struct isert_conn *isert_conn)
875 {
876 int err;
877
878 switch (isert_conn->state) {
879 case ISER_CONN_TERMINATING:
880 break;
881 case ISER_CONN_UP:
882 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
883 isert_info("Terminating conn %p state %d\n",
884 isert_conn, isert_conn->state);
885 isert_conn->state = ISER_CONN_TERMINATING;
886 err = rdma_disconnect(isert_conn->cm_id);
887 if (err)
888 isert_warn("Failed rdma_disconnect isert_conn %p\n",
889 isert_conn);
890 break;
891 default:
892 isert_warn("conn %p teminating in state %d\n",
893 isert_conn, isert_conn->state);
894 }
895 }
896
897 static int
898 isert_np_cma_handler(struct isert_np *isert_np,
899 enum rdma_cm_event_type event)
900 {
901 isert_dbg("%s (%d): isert np %p\n",
902 rdma_event_msg(event), event, isert_np);
903
904 switch (event) {
905 case RDMA_CM_EVENT_DEVICE_REMOVAL:
906 isert_np->np_cm_id = NULL;
907 break;
908 case RDMA_CM_EVENT_ADDR_CHANGE:
909 isert_np->np_cm_id = isert_setup_id(isert_np);
910 if (IS_ERR(isert_np->np_cm_id)) {
911 isert_err("isert np %p setup id failed: %ld\n",
912 isert_np, PTR_ERR(isert_np->np_cm_id));
913 isert_np->np_cm_id = NULL;
914 }
915 break;
916 default:
917 isert_err("isert np %p Unexpected event %d\n",
918 isert_np, event);
919 }
920
921 return -1;
922 }
923
924 static int
925 isert_disconnected_handler(struct rdma_cm_id *cma_id,
926 enum rdma_cm_event_type event)
927 {
928 struct isert_np *isert_np = cma_id->context;
929 struct isert_conn *isert_conn;
930 bool terminating = false;
931
932 if (isert_np->np_cm_id == cma_id)
933 return isert_np_cma_handler(cma_id->context, event);
934
935 isert_conn = cma_id->qp->qp_context;
936
937 mutex_lock(&isert_conn->mutex);
938 terminating = (isert_conn->state == ISER_CONN_TERMINATING);
939 isert_conn_terminate(isert_conn);
940 mutex_unlock(&isert_conn->mutex);
941
942 isert_info("conn %p completing wait\n", isert_conn);
943 complete(&isert_conn->wait);
944
945 if (terminating)
946 goto out;
947
948 mutex_lock(&isert_np->np_accept_mutex);
949 if (!list_empty(&isert_conn->accept_node)) {
950 list_del_init(&isert_conn->accept_node);
951 isert_put_conn(isert_conn);
952 queue_work(isert_release_wq, &isert_conn->release_work);
953 }
954 mutex_unlock(&isert_np->np_accept_mutex);
955
956 out:
957 return 0;
958 }
959
960 static int
961 isert_connect_error(struct rdma_cm_id *cma_id)
962 {
963 struct isert_conn *isert_conn = cma_id->qp->qp_context;
964
965 isert_conn->cm_id = NULL;
966 isert_put_conn(isert_conn);
967
968 return -1;
969 }
970
971 static int
972 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
973 {
974 int ret = 0;
975
976 isert_info("%s (%d): status %d id %p np %p\n",
977 rdma_event_msg(event->event), event->event,
978 event->status, cma_id, cma_id->context);
979
980 switch (event->event) {
981 case RDMA_CM_EVENT_CONNECT_REQUEST:
982 ret = isert_connect_request(cma_id, event);
983 if (ret)
984 isert_err("failed handle connect request %d\n", ret);
985 break;
986 case RDMA_CM_EVENT_ESTABLISHED:
987 isert_connected_handler(cma_id);
988 break;
989 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
990 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
991 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
992 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
993 ret = isert_disconnected_handler(cma_id, event->event);
994 break;
995 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
996 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
997 case RDMA_CM_EVENT_CONNECT_ERROR:
998 ret = isert_connect_error(cma_id);
999 break;
1000 default:
1001 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
1002 break;
1003 }
1004
1005 return ret;
1006 }
1007
1008 static int
1009 isert_post_recv(struct isert_conn *isert_conn, u32 count)
1010 {
1011 struct ib_recv_wr *rx_wr, *rx_wr_failed;
1012 int i, ret;
1013 unsigned int rx_head = isert_conn->rx_desc_head;
1014 struct iser_rx_desc *rx_desc;
1015
1016 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1017 rx_desc = &isert_conn->rx_descs[rx_head];
1018 rx_wr->wr_id = (uintptr_t)rx_desc;
1019 rx_wr->sg_list = &rx_desc->rx_sg;
1020 rx_wr->num_sge = 1;
1021 rx_wr->next = rx_wr + 1;
1022 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
1023 }
1024
1025 rx_wr--;
1026 rx_wr->next = NULL; /* mark end of work requests list */
1027
1028 isert_conn->post_recv_buf_count += count;
1029 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
1030 &rx_wr_failed);
1031 if (ret) {
1032 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1033 isert_conn->post_recv_buf_count -= count;
1034 } else {
1035 isert_dbg("Posted %d RX buffers\n", count);
1036 isert_conn->rx_desc_head = rx_head;
1037 }
1038 return ret;
1039 }
1040
1041 static int
1042 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1043 {
1044 struct ib_device *ib_dev = isert_conn->cm_id->device;
1045 struct ib_send_wr send_wr, *send_wr_failed;
1046 int ret;
1047
1048 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1049 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1050
1051 send_wr.next = NULL;
1052 send_wr.wr_id = (uintptr_t)tx_desc;
1053 send_wr.sg_list = tx_desc->tx_sg;
1054 send_wr.num_sge = tx_desc->num_sge;
1055 send_wr.opcode = IB_WR_SEND;
1056 send_wr.send_flags = IB_SEND_SIGNALED;
1057
1058 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1059 if (ret)
1060 isert_err("ib_post_send() failed, ret: %d\n", ret);
1061
1062 return ret;
1063 }
1064
1065 static void
1066 isert_create_send_desc(struct isert_conn *isert_conn,
1067 struct isert_cmd *isert_cmd,
1068 struct iser_tx_desc *tx_desc)
1069 {
1070 struct isert_device *device = isert_conn->device;
1071 struct ib_device *ib_dev = device->ib_device;
1072
1073 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1074 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1075
1076 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1077 tx_desc->iser_header.flags = ISER_VER;
1078
1079 tx_desc->num_sge = 1;
1080 tx_desc->isert_cmd = isert_cmd;
1081
1082 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1083 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1084 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1085 }
1086 }
1087
1088 static int
1089 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1090 struct iser_tx_desc *tx_desc)
1091 {
1092 struct isert_device *device = isert_conn->device;
1093 struct ib_device *ib_dev = device->ib_device;
1094 u64 dma_addr;
1095
1096 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1097 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1098 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1099 isert_err("ib_dma_mapping_error() failed\n");
1100 return -ENOMEM;
1101 }
1102
1103 tx_desc->dma_addr = dma_addr;
1104 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1105 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1106 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1107
1108 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1109 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1110 tx_desc->tx_sg[0].lkey);
1111
1112 return 0;
1113 }
1114
1115 static void
1116 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1117 struct ib_send_wr *send_wr)
1118 {
1119 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1120
1121 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1122 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1123 send_wr->opcode = IB_WR_SEND;
1124 send_wr->sg_list = &tx_desc->tx_sg[0];
1125 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1126 send_wr->send_flags = IB_SEND_SIGNALED;
1127 }
1128
1129 static int
1130 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1131 {
1132 struct ib_recv_wr rx_wr, *rx_wr_fail;
1133 struct ib_sge sge;
1134 int ret;
1135
1136 memset(&sge, 0, sizeof(struct ib_sge));
1137 sge.addr = isert_conn->login_req_dma;
1138 sge.length = ISER_RX_LOGIN_SIZE;
1139 sge.lkey = isert_conn->device->pd->local_dma_lkey;
1140
1141 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1142 sge.addr, sge.length, sge.lkey);
1143
1144 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1145 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1146 rx_wr.sg_list = &sge;
1147 rx_wr.num_sge = 1;
1148
1149 isert_conn->post_recv_buf_count++;
1150 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1151 if (ret) {
1152 isert_err("ib_post_recv() failed: %d\n", ret);
1153 isert_conn->post_recv_buf_count--;
1154 }
1155
1156 return ret;
1157 }
1158
1159 static int
1160 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1161 u32 length)
1162 {
1163 struct isert_conn *isert_conn = conn->context;
1164 struct isert_device *device = isert_conn->device;
1165 struct ib_device *ib_dev = device->ib_device;
1166 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1167 int ret;
1168
1169 isert_create_send_desc(isert_conn, NULL, tx_desc);
1170
1171 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1172 sizeof(struct iscsi_hdr));
1173
1174 isert_init_tx_hdrs(isert_conn, tx_desc);
1175
1176 if (length > 0) {
1177 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1178
1179 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1180 length, DMA_TO_DEVICE);
1181
1182 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1183
1184 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1185 length, DMA_TO_DEVICE);
1186
1187 tx_dsg->addr = isert_conn->login_rsp_dma;
1188 tx_dsg->length = length;
1189 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1190 tx_desc->num_sge = 2;
1191 }
1192 if (!login->login_failed) {
1193 if (login->login_complete) {
1194 if (!conn->sess->sess_ops->SessionType &&
1195 isert_conn->device->use_fastreg) {
1196 ret = isert_conn_create_fastreg_pool(isert_conn);
1197 if (ret) {
1198 isert_err("Conn: %p failed to create"
1199 " fastreg pool\n", isert_conn);
1200 return ret;
1201 }
1202 }
1203
1204 ret = isert_alloc_rx_descriptors(isert_conn);
1205 if (ret)
1206 return ret;
1207
1208 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1209 if (ret)
1210 return ret;
1211
1212 /* Now we are in FULL_FEATURE phase */
1213 mutex_lock(&isert_conn->mutex);
1214 isert_conn->state = ISER_CONN_FULL_FEATURE;
1215 mutex_unlock(&isert_conn->mutex);
1216 goto post_send;
1217 }
1218
1219 ret = isert_rdma_post_recvl(isert_conn);
1220 if (ret)
1221 return ret;
1222 }
1223 post_send:
1224 ret = isert_post_send(isert_conn, tx_desc);
1225 if (ret)
1226 return ret;
1227
1228 return 0;
1229 }
1230
1231 static void
1232 isert_rx_login_req(struct isert_conn *isert_conn)
1233 {
1234 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1235 int rx_buflen = isert_conn->login_req_len;
1236 struct iscsi_conn *conn = isert_conn->conn;
1237 struct iscsi_login *login = conn->conn_login;
1238 int size;
1239
1240 isert_info("conn %p\n", isert_conn);
1241
1242 WARN_ON_ONCE(!login);
1243
1244 if (login->first_request) {
1245 struct iscsi_login_req *login_req =
1246 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1247 /*
1248 * Setup the initial iscsi_login values from the leading
1249 * login request PDU.
1250 */
1251 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1252 login->current_stage =
1253 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1254 >> 2;
1255 login->version_min = login_req->min_version;
1256 login->version_max = login_req->max_version;
1257 memcpy(login->isid, login_req->isid, 6);
1258 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1259 login->init_task_tag = login_req->itt;
1260 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1261 login->cid = be16_to_cpu(login_req->cid);
1262 login->tsih = be16_to_cpu(login_req->tsih);
1263 }
1264
1265 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1266
1267 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1268 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1269 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1270 MAX_KEY_VALUE_PAIRS);
1271 memcpy(login->req_buf, &rx_desc->data[0], size);
1272
1273 if (login->first_request) {
1274 complete(&isert_conn->login_comp);
1275 return;
1276 }
1277 schedule_delayed_work(&conn->login_work, 0);
1278 }
1279
1280 static struct iscsi_cmd
1281 *isert_allocate_cmd(struct iscsi_conn *conn)
1282 {
1283 struct isert_conn *isert_conn = conn->context;
1284 struct isert_cmd *isert_cmd;
1285 struct iscsi_cmd *cmd;
1286
1287 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1288 if (!cmd) {
1289 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1290 return NULL;
1291 }
1292 isert_cmd = iscsit_priv_cmd(cmd);
1293 isert_cmd->conn = isert_conn;
1294 isert_cmd->iscsi_cmd = cmd;
1295
1296 return cmd;
1297 }
1298
1299 static int
1300 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1301 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1302 struct iser_rx_desc *rx_desc, unsigned char *buf)
1303 {
1304 struct iscsi_conn *conn = isert_conn->conn;
1305 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1306 struct scatterlist *sg;
1307 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1308 bool dump_payload = false;
1309
1310 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1311 if (rc < 0)
1312 return rc;
1313
1314 imm_data = cmd->immediate_data;
1315 imm_data_len = cmd->first_burst_len;
1316 unsol_data = cmd->unsolicited_data;
1317
1318 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1319 if (rc < 0) {
1320 return 0;
1321 } else if (rc > 0) {
1322 dump_payload = true;
1323 goto sequence_cmd;
1324 }
1325
1326 if (!imm_data)
1327 return 0;
1328
1329 sg = &cmd->se_cmd.t_data_sg[0];
1330 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1331
1332 isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1333 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1334
1335 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1336
1337 cmd->write_data_done += imm_data_len;
1338
1339 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1340 spin_lock_bh(&cmd->istate_lock);
1341 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1342 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1343 spin_unlock_bh(&cmd->istate_lock);
1344 }
1345
1346 sequence_cmd:
1347 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1348
1349 if (!rc && dump_payload == false && unsol_data)
1350 iscsit_set_unsoliticed_dataout(cmd);
1351 else if (dump_payload && imm_data)
1352 target_put_sess_cmd(&cmd->se_cmd);
1353
1354 return 0;
1355 }
1356
1357 static int
1358 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1359 struct iser_rx_desc *rx_desc, unsigned char *buf)
1360 {
1361 struct scatterlist *sg_start;
1362 struct iscsi_conn *conn = isert_conn->conn;
1363 struct iscsi_cmd *cmd = NULL;
1364 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1365 u32 unsol_data_len = ntoh24(hdr->dlength);
1366 int rc, sg_nents, sg_off, page_off;
1367
1368 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1369 if (rc < 0)
1370 return rc;
1371 else if (!cmd)
1372 return 0;
1373 /*
1374 * FIXME: Unexpected unsolicited_data out
1375 */
1376 if (!cmd->unsolicited_data) {
1377 isert_err("Received unexpected solicited data payload\n");
1378 dump_stack();
1379 return -1;
1380 }
1381
1382 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1383 "write_data_done: %u, data_length: %u\n",
1384 unsol_data_len, cmd->write_data_done,
1385 cmd->se_cmd.data_length);
1386
1387 sg_off = cmd->write_data_done / PAGE_SIZE;
1388 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1389 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1390 page_off = cmd->write_data_done % PAGE_SIZE;
1391 /*
1392 * FIXME: Non page-aligned unsolicited_data out
1393 */
1394 if (page_off) {
1395 isert_err("unexpected non-page aligned data payload\n");
1396 dump_stack();
1397 return -1;
1398 }
1399 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1400 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1401 sg_nents, &rx_desc->data[0], unsol_data_len);
1402
1403 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1404 unsol_data_len);
1405
1406 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1407 if (rc < 0)
1408 return rc;
1409
1410 return 0;
1411 }
1412
1413 static int
1414 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1415 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1416 unsigned char *buf)
1417 {
1418 struct iscsi_conn *conn = isert_conn->conn;
1419 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1420 int rc;
1421
1422 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1423 if (rc < 0)
1424 return rc;
1425 /*
1426 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1427 */
1428
1429 return iscsit_process_nop_out(conn, cmd, hdr);
1430 }
1431
1432 static int
1433 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1434 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1435 struct iscsi_text *hdr)
1436 {
1437 struct iscsi_conn *conn = isert_conn->conn;
1438 u32 payload_length = ntoh24(hdr->dlength);
1439 int rc;
1440 unsigned char *text_in = NULL;
1441
1442 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1443 if (rc < 0)
1444 return rc;
1445
1446 if (payload_length) {
1447 text_in = kzalloc(payload_length, GFP_KERNEL);
1448 if (!text_in) {
1449 isert_err("Unable to allocate text_in of payload_length: %u\n",
1450 payload_length);
1451 return -ENOMEM;
1452 }
1453 }
1454 cmd->text_in_ptr = text_in;
1455
1456 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1457
1458 return iscsit_process_text_cmd(conn, cmd, hdr);
1459 }
1460
1461 static int
1462 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1463 uint32_t read_stag, uint64_t read_va,
1464 uint32_t write_stag, uint64_t write_va)
1465 {
1466 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1467 struct iscsi_conn *conn = isert_conn->conn;
1468 struct iscsi_cmd *cmd;
1469 struct isert_cmd *isert_cmd;
1470 int ret = -EINVAL;
1471 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1472
1473 if (conn->sess->sess_ops->SessionType &&
1474 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1475 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1476 " ignoring\n", opcode);
1477 return 0;
1478 }
1479
1480 switch (opcode) {
1481 case ISCSI_OP_SCSI_CMD:
1482 cmd = isert_allocate_cmd(conn);
1483 if (!cmd)
1484 break;
1485
1486 isert_cmd = iscsit_priv_cmd(cmd);
1487 isert_cmd->read_stag = read_stag;
1488 isert_cmd->read_va = read_va;
1489 isert_cmd->write_stag = write_stag;
1490 isert_cmd->write_va = write_va;
1491
1492 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1493 rx_desc, (unsigned char *)hdr);
1494 break;
1495 case ISCSI_OP_NOOP_OUT:
1496 cmd = isert_allocate_cmd(conn);
1497 if (!cmd)
1498 break;
1499
1500 isert_cmd = iscsit_priv_cmd(cmd);
1501 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1502 rx_desc, (unsigned char *)hdr);
1503 break;
1504 case ISCSI_OP_SCSI_DATA_OUT:
1505 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1506 (unsigned char *)hdr);
1507 break;
1508 case ISCSI_OP_SCSI_TMFUNC:
1509 cmd = isert_allocate_cmd(conn);
1510 if (!cmd)
1511 break;
1512
1513 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1514 (unsigned char *)hdr);
1515 break;
1516 case ISCSI_OP_LOGOUT:
1517 cmd = isert_allocate_cmd(conn);
1518 if (!cmd)
1519 break;
1520
1521 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1522 break;
1523 case ISCSI_OP_TEXT:
1524 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) {
1525 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1526 if (!cmd)
1527 break;
1528 } else {
1529 cmd = isert_allocate_cmd(conn);
1530 if (!cmd)
1531 break;
1532 }
1533
1534 isert_cmd = iscsit_priv_cmd(cmd);
1535 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1536 rx_desc, (struct iscsi_text *)hdr);
1537 break;
1538 default:
1539 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1540 dump_stack();
1541 break;
1542 }
1543
1544 return ret;
1545 }
1546
1547 static void
1548 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1549 {
1550 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1551 uint64_t read_va = 0, write_va = 0;
1552 uint32_t read_stag = 0, write_stag = 0;
1553 int rc;
1554
1555 switch (iser_hdr->flags & 0xF0) {
1556 case ISCSI_CTRL:
1557 if (iser_hdr->flags & ISER_RSV) {
1558 read_stag = be32_to_cpu(iser_hdr->read_stag);
1559 read_va = be64_to_cpu(iser_hdr->read_va);
1560 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1561 read_stag, (unsigned long long)read_va);
1562 }
1563 if (iser_hdr->flags & ISER_WSV) {
1564 write_stag = be32_to_cpu(iser_hdr->write_stag);
1565 write_va = be64_to_cpu(iser_hdr->write_va);
1566 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1567 write_stag, (unsigned long long)write_va);
1568 }
1569
1570 isert_dbg("ISER ISCSI_CTRL PDU\n");
1571 break;
1572 case ISER_HELLO:
1573 isert_err("iSER Hello message\n");
1574 break;
1575 default:
1576 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1577 break;
1578 }
1579
1580 rc = isert_rx_opcode(isert_conn, rx_desc,
1581 read_stag, read_va, write_stag, write_va);
1582 }
1583
1584 static void
1585 isert_rcv_completion(struct iser_rx_desc *desc,
1586 struct isert_conn *isert_conn,
1587 u32 xfer_len)
1588 {
1589 struct ib_device *ib_dev = isert_conn->cm_id->device;
1590 struct iscsi_hdr *hdr;
1591 u64 rx_dma;
1592 int rx_buflen, outstanding;
1593
1594 if ((char *)desc == isert_conn->login_req_buf) {
1595 rx_dma = isert_conn->login_req_dma;
1596 rx_buflen = ISER_RX_LOGIN_SIZE;
1597 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1598 rx_dma, rx_buflen);
1599 } else {
1600 rx_dma = desc->dma_addr;
1601 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1602 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1603 rx_dma, rx_buflen);
1604 }
1605
1606 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1607
1608 hdr = &desc->iscsi_header;
1609 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1610 hdr->opcode, hdr->itt, hdr->flags,
1611 (int)(xfer_len - ISER_HEADERS_LEN));
1612
1613 if ((char *)desc == isert_conn->login_req_buf) {
1614 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1615 if (isert_conn->conn) {
1616 struct iscsi_login *login = isert_conn->conn->conn_login;
1617
1618 if (login && !login->first_request)
1619 isert_rx_login_req(isert_conn);
1620 }
1621 mutex_lock(&isert_conn->mutex);
1622 complete(&isert_conn->login_req_comp);
1623 mutex_unlock(&isert_conn->mutex);
1624 } else {
1625 isert_rx_do_work(desc, isert_conn);
1626 }
1627
1628 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1629 DMA_FROM_DEVICE);
1630
1631 isert_conn->post_recv_buf_count--;
1632 isert_dbg("Decremented post_recv_buf_count: %d\n",
1633 isert_conn->post_recv_buf_count);
1634
1635 if ((char *)desc == isert_conn->login_req_buf)
1636 return;
1637
1638 outstanding = isert_conn->post_recv_buf_count;
1639 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1640 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1641 ISERT_MIN_POSTED_RX);
1642 err = isert_post_recv(isert_conn, count);
1643 if (err) {
1644 isert_err("isert_post_recv() count: %d failed, %d\n",
1645 count, err);
1646 }
1647 }
1648 }
1649
1650 static int
1651 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1652 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1653 enum iser_ib_op_code op, struct isert_data_buf *data)
1654 {
1655 struct ib_device *ib_dev = isert_conn->cm_id->device;
1656
1657 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1658 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1659
1660 data->len = length - offset;
1661 data->offset = offset;
1662 data->sg_off = data->offset / PAGE_SIZE;
1663
1664 data->sg = &sg[data->sg_off];
1665 data->nents = min_t(unsigned int, nents - data->sg_off,
1666 ISCSI_ISER_SG_TABLESIZE);
1667 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1668 PAGE_SIZE);
1669
1670 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1671 data->dma_dir);
1672 if (unlikely(!data->dma_nents)) {
1673 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1674 return -EINVAL;
1675 }
1676
1677 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1678 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1679
1680 return 0;
1681 }
1682
1683 static void
1684 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1685 {
1686 struct ib_device *ib_dev = isert_conn->cm_id->device;
1687
1688 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1689 memset(data, 0, sizeof(*data));
1690 }
1691
1692
1693
1694 static void
1695 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1696 {
1697 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1698
1699 isert_dbg("Cmd %p\n", isert_cmd);
1700
1701 if (wr->data.sg) {
1702 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1703 isert_unmap_data_buf(isert_conn, &wr->data);
1704 }
1705
1706 if (wr->send_wr) {
1707 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1708 kfree(wr->send_wr);
1709 wr->send_wr = NULL;
1710 }
1711
1712 if (wr->ib_sge) {
1713 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1714 kfree(wr->ib_sge);
1715 wr->ib_sge = NULL;
1716 }
1717 }
1718
1719 static void
1720 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1721 {
1722 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1723
1724 isert_dbg("Cmd %p\n", isert_cmd);
1725
1726 if (wr->fr_desc) {
1727 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1728 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1729 isert_unmap_data_buf(isert_conn, &wr->prot);
1730 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1731 }
1732 spin_lock_bh(&isert_conn->pool_lock);
1733 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1734 spin_unlock_bh(&isert_conn->pool_lock);
1735 wr->fr_desc = NULL;
1736 }
1737
1738 if (wr->data.sg) {
1739 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1740 isert_unmap_data_buf(isert_conn, &wr->data);
1741 }
1742
1743 wr->ib_sge = NULL;
1744 wr->send_wr = NULL;
1745 }
1746
1747 static void
1748 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1749 {
1750 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1751 struct isert_conn *isert_conn = isert_cmd->conn;
1752 struct iscsi_conn *conn = isert_conn->conn;
1753 struct isert_device *device = isert_conn->device;
1754 struct iscsi_text_rsp *hdr;
1755
1756 isert_dbg("Cmd %p\n", isert_cmd);
1757
1758 switch (cmd->iscsi_opcode) {
1759 case ISCSI_OP_SCSI_CMD:
1760 spin_lock_bh(&conn->cmd_lock);
1761 if (!list_empty(&cmd->i_conn_node))
1762 list_del_init(&cmd->i_conn_node);
1763 spin_unlock_bh(&conn->cmd_lock);
1764
1765 if (cmd->data_direction == DMA_TO_DEVICE) {
1766 iscsit_stop_dataout_timer(cmd);
1767 /*
1768 * Check for special case during comp_err where
1769 * WRITE_PENDING has been handed off from core,
1770 * but requires an extra target_put_sess_cmd()
1771 * before transport_generic_free_cmd() below.
1772 */
1773 if (comp_err &&
1774 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1775 struct se_cmd *se_cmd = &cmd->se_cmd;
1776
1777 target_put_sess_cmd(se_cmd);
1778 }
1779 }
1780
1781 device->unreg_rdma_mem(isert_cmd, isert_conn);
1782 transport_generic_free_cmd(&cmd->se_cmd, 0);
1783 break;
1784 case ISCSI_OP_SCSI_TMFUNC:
1785 spin_lock_bh(&conn->cmd_lock);
1786 if (!list_empty(&cmd->i_conn_node))
1787 list_del_init(&cmd->i_conn_node);
1788 spin_unlock_bh(&conn->cmd_lock);
1789
1790 transport_generic_free_cmd(&cmd->se_cmd, 0);
1791 break;
1792 case ISCSI_OP_REJECT:
1793 case ISCSI_OP_NOOP_OUT:
1794 case ISCSI_OP_TEXT:
1795 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1796 /* If the continue bit is on, keep the command alive */
1797 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1798 break;
1799
1800 spin_lock_bh(&conn->cmd_lock);
1801 if (!list_empty(&cmd->i_conn_node))
1802 list_del_init(&cmd->i_conn_node);
1803 spin_unlock_bh(&conn->cmd_lock);
1804
1805 /*
1806 * Handle special case for REJECT when iscsi_add_reject*() has
1807 * overwritten the original iscsi_opcode assignment, and the
1808 * associated cmd->se_cmd needs to be released.
1809 */
1810 if (cmd->se_cmd.se_tfo != NULL) {
1811 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1812 cmd->iscsi_opcode);
1813 transport_generic_free_cmd(&cmd->se_cmd, 0);
1814 break;
1815 }
1816 /*
1817 * Fall-through
1818 */
1819 default:
1820 iscsit_release_cmd(cmd);
1821 break;
1822 }
1823 }
1824
1825 static void
1826 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1827 {
1828 if (tx_desc->dma_addr != 0) {
1829 isert_dbg("unmap single for tx_desc->dma_addr\n");
1830 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1831 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1832 tx_desc->dma_addr = 0;
1833 }
1834 }
1835
1836 static void
1837 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1838 struct ib_device *ib_dev, bool comp_err)
1839 {
1840 if (isert_cmd->pdu_buf_dma != 0) {
1841 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1842 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1843 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1844 isert_cmd->pdu_buf_dma = 0;
1845 }
1846
1847 isert_unmap_tx_desc(tx_desc, ib_dev);
1848 isert_put_cmd(isert_cmd, comp_err);
1849 }
1850
1851 static int
1852 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1853 {
1854 struct ib_mr_status mr_status;
1855 int ret;
1856
1857 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1858 if (ret) {
1859 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1860 goto fail_mr_status;
1861 }
1862
1863 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1864 u64 sec_offset_err;
1865 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1866
1867 switch (mr_status.sig_err.err_type) {
1868 case IB_SIG_BAD_GUARD:
1869 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1870 break;
1871 case IB_SIG_BAD_REFTAG:
1872 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1873 break;
1874 case IB_SIG_BAD_APPTAG:
1875 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1876 break;
1877 }
1878 sec_offset_err = mr_status.sig_err.sig_err_offset;
1879 do_div(sec_offset_err, block_size);
1880 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1881
1882 isert_err("PI error found type %d at sector 0x%llx "
1883 "expected 0x%x vs actual 0x%x\n",
1884 mr_status.sig_err.err_type,
1885 (unsigned long long)se_cmd->bad_sector,
1886 mr_status.sig_err.expected,
1887 mr_status.sig_err.actual);
1888 ret = 1;
1889 }
1890
1891 fail_mr_status:
1892 return ret;
1893 }
1894
1895 static void
1896 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1897 struct isert_cmd *isert_cmd)
1898 {
1899 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1900 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1901 struct se_cmd *se_cmd = &cmd->se_cmd;
1902 struct isert_conn *isert_conn = isert_cmd->conn;
1903 struct isert_device *device = isert_conn->device;
1904 int ret = 0;
1905
1906 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1907 ret = isert_check_pi_status(se_cmd,
1908 wr->fr_desc->pi_ctx->sig_mr);
1909 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1910 }
1911
1912 device->unreg_rdma_mem(isert_cmd, isert_conn);
1913 wr->send_wr_num = 0;
1914 if (ret)
1915 transport_send_check_condition_and_sense(se_cmd,
1916 se_cmd->pi_err, 0);
1917 else
1918 isert_put_response(isert_conn->conn, cmd);
1919 }
1920
1921 static void
1922 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1923 struct isert_cmd *isert_cmd)
1924 {
1925 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1926 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1927 struct se_cmd *se_cmd = &cmd->se_cmd;
1928 struct isert_conn *isert_conn = isert_cmd->conn;
1929 struct isert_device *device = isert_conn->device;
1930 int ret = 0;
1931
1932 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1933 ret = isert_check_pi_status(se_cmd,
1934 wr->fr_desc->pi_ctx->sig_mr);
1935 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1936 }
1937
1938 iscsit_stop_dataout_timer(cmd);
1939 device->unreg_rdma_mem(isert_cmd, isert_conn);
1940 cmd->write_data_done = wr->data.len;
1941 wr->send_wr_num = 0;
1942
1943 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1944 spin_lock_bh(&cmd->istate_lock);
1945 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1946 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1947 spin_unlock_bh(&cmd->istate_lock);
1948
1949 if (ret) {
1950 target_put_sess_cmd(se_cmd);
1951 transport_send_check_condition_and_sense(se_cmd,
1952 se_cmd->pi_err, 0);
1953 } else {
1954 target_execute_cmd(se_cmd);
1955 }
1956 }
1957
1958 static void
1959 isert_do_control_comp(struct work_struct *work)
1960 {
1961 struct isert_cmd *isert_cmd = container_of(work,
1962 struct isert_cmd, comp_work);
1963 struct isert_conn *isert_conn = isert_cmd->conn;
1964 struct ib_device *ib_dev = isert_conn->cm_id->device;
1965 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1966
1967 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1968
1969 switch (cmd->i_state) {
1970 case ISTATE_SEND_TASKMGTRSP:
1971 iscsit_tmr_post_handler(cmd, cmd->conn);
1972 case ISTATE_SEND_REJECT: /* FALLTHRU */
1973 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1974 cmd->i_state = ISTATE_SENT_STATUS;
1975 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1976 ib_dev, false);
1977 break;
1978 case ISTATE_SEND_LOGOUTRSP:
1979 iscsit_logout_post_handler(cmd, cmd->conn);
1980 break;
1981 default:
1982 isert_err("Unknown i_state %d\n", cmd->i_state);
1983 dump_stack();
1984 break;
1985 }
1986 }
1987
1988 static void
1989 isert_response_completion(struct iser_tx_desc *tx_desc,
1990 struct isert_cmd *isert_cmd,
1991 struct isert_conn *isert_conn,
1992 struct ib_device *ib_dev)
1993 {
1994 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1995
1996 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1997 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1998 cmd->i_state == ISTATE_SEND_REJECT ||
1999 cmd->i_state == ISTATE_SEND_TEXTRSP) {
2000 isert_unmap_tx_desc(tx_desc, ib_dev);
2001
2002 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2003 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2004 return;
2005 }
2006
2007 cmd->i_state = ISTATE_SENT_STATUS;
2008 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2009 }
2010
2011 static void
2012 isert_snd_completion(struct iser_tx_desc *tx_desc,
2013 struct isert_conn *isert_conn)
2014 {
2015 struct ib_device *ib_dev = isert_conn->cm_id->device;
2016 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2017 struct isert_rdma_wr *wr;
2018
2019 if (!isert_cmd) {
2020 isert_unmap_tx_desc(tx_desc, ib_dev);
2021 return;
2022 }
2023 wr = &isert_cmd->rdma_wr;
2024
2025 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2026
2027 switch (wr->iser_ib_op) {
2028 case ISER_IB_SEND:
2029 isert_response_completion(tx_desc, isert_cmd,
2030 isert_conn, ib_dev);
2031 break;
2032 case ISER_IB_RDMA_WRITE:
2033 isert_completion_rdma_write(tx_desc, isert_cmd);
2034 break;
2035 case ISER_IB_RDMA_READ:
2036 isert_completion_rdma_read(tx_desc, isert_cmd);
2037 break;
2038 default:
2039 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2040 dump_stack();
2041 break;
2042 }
2043 }
2044
2045 /**
2046 * is_isert_tx_desc() - Indicate if the completion wr_id
2047 * is a TX descriptor or not.
2048 * @isert_conn: iser connection
2049 * @wr_id: completion WR identifier
2050 *
2051 * Since we cannot rely on wc opcode in FLUSH errors
2052 * we must work around it by checking if the wr_id address
2053 * falls in the iser connection rx_descs buffer. If so
2054 * it is an RX descriptor, otherwize it is a TX.
2055 */
2056 static inline bool
2057 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2058 {
2059 void *start = isert_conn->rx_descs;
2060 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2061
2062 if (wr_id >= start && wr_id < start + len)
2063 return false;
2064
2065 return true;
2066 }
2067
2068 static void
2069 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2070 {
2071 if (wc->wr_id == ISER_BEACON_WRID) {
2072 isert_info("conn %p completing wait_comp_err\n",
2073 isert_conn);
2074 complete(&isert_conn->wait_comp_err);
2075 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2076 struct ib_device *ib_dev = isert_conn->cm_id->device;
2077 struct isert_cmd *isert_cmd;
2078 struct iser_tx_desc *desc;
2079
2080 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2081 isert_cmd = desc->isert_cmd;
2082 if (!isert_cmd)
2083 isert_unmap_tx_desc(desc, ib_dev);
2084 else
2085 isert_completion_put(desc, isert_cmd, ib_dev, true);
2086 } else {
2087 isert_conn->post_recv_buf_count--;
2088 if (!isert_conn->post_recv_buf_count)
2089 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2090 }
2091 }
2092
2093 static void
2094 isert_handle_wc(struct ib_wc *wc)
2095 {
2096 struct isert_conn *isert_conn;
2097 struct iser_tx_desc *tx_desc;
2098 struct iser_rx_desc *rx_desc;
2099
2100 isert_conn = wc->qp->qp_context;
2101 if (likely(wc->status == IB_WC_SUCCESS)) {
2102 if (wc->opcode == IB_WC_RECV) {
2103 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2104 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2105 } else {
2106 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2107 isert_snd_completion(tx_desc, isert_conn);
2108 }
2109 } else {
2110 if (wc->status != IB_WC_WR_FLUSH_ERR)
2111 isert_err("%s (%d): wr id %llx vend_err %x\n",
2112 ib_wc_status_msg(wc->status), wc->status,
2113 wc->wr_id, wc->vendor_err);
2114 else
2115 isert_dbg("%s (%d): wr id %llx\n",
2116 ib_wc_status_msg(wc->status), wc->status,
2117 wc->wr_id);
2118
2119 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2120 isert_cq_comp_err(isert_conn, wc);
2121 }
2122 }
2123
2124 static void
2125 isert_cq_work(struct work_struct *work)
2126 {
2127 enum { isert_poll_budget = 65536 };
2128 struct isert_comp *comp = container_of(work, struct isert_comp,
2129 work);
2130 struct ib_wc *const wcs = comp->wcs;
2131 int i, n, completed = 0;
2132
2133 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2134 for (i = 0; i < n; i++)
2135 isert_handle_wc(&wcs[i]);
2136
2137 completed += n;
2138 if (completed >= isert_poll_budget)
2139 break;
2140 }
2141
2142 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2143 }
2144
2145 static void
2146 isert_cq_callback(struct ib_cq *cq, void *context)
2147 {
2148 struct isert_comp *comp = context;
2149
2150 queue_work(isert_comp_wq, &comp->work);
2151 }
2152
2153 static int
2154 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2155 {
2156 struct ib_send_wr *wr_failed;
2157 int ret;
2158
2159 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2160 &wr_failed);
2161 if (ret) {
2162 isert_err("ib_post_send failed with %d\n", ret);
2163 return ret;
2164 }
2165 return ret;
2166 }
2167
2168 static int
2169 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2170 {
2171 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2172 struct isert_conn *isert_conn = conn->context;
2173 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2174 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2175 &isert_cmd->tx_desc.iscsi_header;
2176
2177 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2178 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2179 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2180 /*
2181 * Attach SENSE DATA payload to iSCSI Response PDU
2182 */
2183 if (cmd->se_cmd.sense_buffer &&
2184 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2185 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2186 struct isert_device *device = isert_conn->device;
2187 struct ib_device *ib_dev = device->ib_device;
2188 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2189 u32 padding, pdu_len;
2190
2191 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2192 cmd->sense_buffer);
2193 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2194
2195 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2196 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2197 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2198
2199 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2200 (void *)cmd->sense_buffer, pdu_len,
2201 DMA_TO_DEVICE);
2202
2203 isert_cmd->pdu_buf_len = pdu_len;
2204 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2205 tx_dsg->length = pdu_len;
2206 tx_dsg->lkey = device->pd->local_dma_lkey;
2207 isert_cmd->tx_desc.num_sge = 2;
2208 }
2209
2210 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2211
2212 isert_dbg("Posting SCSI Response\n");
2213
2214 return isert_post_response(isert_conn, isert_cmd);
2215 }
2216
2217 static void
2218 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2219 {
2220 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2221 struct isert_conn *isert_conn = conn->context;
2222 struct isert_device *device = isert_conn->device;
2223
2224 spin_lock_bh(&conn->cmd_lock);
2225 if (!list_empty(&cmd->i_conn_node))
2226 list_del_init(&cmd->i_conn_node);
2227 spin_unlock_bh(&conn->cmd_lock);
2228
2229 if (cmd->data_direction == DMA_TO_DEVICE)
2230 iscsit_stop_dataout_timer(cmd);
2231
2232 device->unreg_rdma_mem(isert_cmd, isert_conn);
2233 }
2234
2235 static enum target_prot_op
2236 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2237 {
2238 struct isert_conn *isert_conn = conn->context;
2239 struct isert_device *device = isert_conn->device;
2240
2241 if (conn->tpg->tpg_attrib.t10_pi) {
2242 if (device->pi_capable) {
2243 isert_info("conn %p PI offload enabled\n", isert_conn);
2244 isert_conn->pi_support = true;
2245 return TARGET_PROT_ALL;
2246 }
2247 }
2248
2249 isert_info("conn %p PI offload disabled\n", isert_conn);
2250 isert_conn->pi_support = false;
2251
2252 return TARGET_PROT_NORMAL;
2253 }
2254
2255 static int
2256 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2257 bool nopout_response)
2258 {
2259 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2260 struct isert_conn *isert_conn = conn->context;
2261 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2262
2263 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2264 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2265 &isert_cmd->tx_desc.iscsi_header,
2266 nopout_response);
2267 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2268 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2269
2270 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2271
2272 return isert_post_response(isert_conn, isert_cmd);
2273 }
2274
2275 static int
2276 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2277 {
2278 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2279 struct isert_conn *isert_conn = conn->context;
2280 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2281
2282 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2283 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2284 &isert_cmd->tx_desc.iscsi_header);
2285 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2286 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2287
2288 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2289
2290 return isert_post_response(isert_conn, isert_cmd);
2291 }
2292
2293 static int
2294 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2295 {
2296 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2297 struct isert_conn *isert_conn = conn->context;
2298 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2299
2300 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2301 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2302 &isert_cmd->tx_desc.iscsi_header);
2303 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2304 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2305
2306 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2307
2308 return isert_post_response(isert_conn, isert_cmd);
2309 }
2310
2311 static int
2312 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2313 {
2314 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2315 struct isert_conn *isert_conn = conn->context;
2316 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2317 struct isert_device *device = isert_conn->device;
2318 struct ib_device *ib_dev = device->ib_device;
2319 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2320 struct iscsi_reject *hdr =
2321 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2322
2323 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2324 iscsit_build_reject(cmd, conn, hdr);
2325 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2326
2327 hton24(hdr->dlength, ISCSI_HDR_LEN);
2328 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2329 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2330 DMA_TO_DEVICE);
2331 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2332 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2333 tx_dsg->length = ISCSI_HDR_LEN;
2334 tx_dsg->lkey = device->pd->local_dma_lkey;
2335 isert_cmd->tx_desc.num_sge = 2;
2336
2337 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2338
2339 isert_dbg("conn %p Posting Reject\n", isert_conn);
2340
2341 return isert_post_response(isert_conn, isert_cmd);
2342 }
2343
2344 static int
2345 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2346 {
2347 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2348 struct isert_conn *isert_conn = conn->context;
2349 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2350 struct iscsi_text_rsp *hdr =
2351 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2352 u32 txt_rsp_len;
2353 int rc;
2354
2355 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2356 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2357 if (rc < 0)
2358 return rc;
2359
2360 txt_rsp_len = rc;
2361 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2362
2363 if (txt_rsp_len) {
2364 struct isert_device *device = isert_conn->device;
2365 struct ib_device *ib_dev = device->ib_device;
2366 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2367 void *txt_rsp_buf = cmd->buf_ptr;
2368
2369 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2370 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2371
2372 isert_cmd->pdu_buf_len = txt_rsp_len;
2373 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2374 tx_dsg->length = txt_rsp_len;
2375 tx_dsg->lkey = device->pd->local_dma_lkey;
2376 isert_cmd->tx_desc.num_sge = 2;
2377 }
2378 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2379
2380 isert_dbg("conn %p Text Response\n", isert_conn);
2381
2382 return isert_post_response(isert_conn, isert_cmd);
2383 }
2384
2385 static int
2386 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2387 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2388 u32 data_left, u32 offset)
2389 {
2390 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2391 struct scatterlist *sg_start, *tmp_sg;
2392 struct isert_device *device = isert_conn->device;
2393 struct ib_device *ib_dev = device->ib_device;
2394 u32 sg_off, page_off;
2395 int i = 0, sg_nents;
2396
2397 sg_off = offset / PAGE_SIZE;
2398 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2399 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2400 page_off = offset % PAGE_SIZE;
2401
2402 send_wr->sg_list = ib_sge;
2403 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2404 /*
2405 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2406 */
2407 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2408 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2409 "page_off: %u\n",
2410 (unsigned long long)tmp_sg->dma_address,
2411 tmp_sg->length, page_off);
2412
2413 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2414 ib_sge->length = min_t(u32, data_left,
2415 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2416 ib_sge->lkey = device->pd->local_dma_lkey;
2417
2418 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2419 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2420 page_off = 0;
2421 data_left -= ib_sge->length;
2422 if (!data_left)
2423 break;
2424 ib_sge++;
2425 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2426 }
2427
2428 send_wr->num_sge = ++i;
2429 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2430 send_wr->sg_list, send_wr->num_sge);
2431
2432 return send_wr->num_sge;
2433 }
2434
2435 static int
2436 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2437 struct isert_rdma_wr *wr)
2438 {
2439 struct se_cmd *se_cmd = &cmd->se_cmd;
2440 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2441 struct isert_conn *isert_conn = conn->context;
2442 struct isert_data_buf *data = &wr->data;
2443 struct ib_send_wr *send_wr;
2444 struct ib_sge *ib_sge;
2445 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2446 int ret = 0, i, ib_sge_cnt;
2447
2448 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2449
2450 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2451 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2452 se_cmd->t_data_nents, se_cmd->data_length,
2453 offset, wr->iser_ib_op, &wr->data);
2454 if (ret)
2455 return ret;
2456
2457 data_left = data->len;
2458 offset = data->offset;
2459
2460 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2461 if (!ib_sge) {
2462 isert_warn("Unable to allocate ib_sge\n");
2463 ret = -ENOMEM;
2464 goto unmap_cmd;
2465 }
2466 wr->ib_sge = ib_sge;
2467
2468 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2469 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2470 GFP_KERNEL);
2471 if (!wr->send_wr) {
2472 isert_dbg("Unable to allocate wr->send_wr\n");
2473 ret = -ENOMEM;
2474 goto unmap_cmd;
2475 }
2476
2477 wr->isert_cmd = isert_cmd;
2478 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2479
2480 for (i = 0; i < wr->send_wr_num; i++) {
2481 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2482 data_len = min(data_left, rdma_write_max);
2483
2484 send_wr->send_flags = 0;
2485 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2486 send_wr->opcode = IB_WR_RDMA_WRITE;
2487 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2488 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2489 if (i + 1 == wr->send_wr_num)
2490 send_wr->next = &isert_cmd->tx_desc.send_wr;
2491 else
2492 send_wr->next = &wr->send_wr[i + 1];
2493 } else {
2494 send_wr->opcode = IB_WR_RDMA_READ;
2495 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2496 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2497 if (i + 1 == wr->send_wr_num)
2498 send_wr->send_flags = IB_SEND_SIGNALED;
2499 else
2500 send_wr->next = &wr->send_wr[i + 1];
2501 }
2502
2503 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2504 send_wr, data_len, offset);
2505 ib_sge += ib_sge_cnt;
2506
2507 offset += data_len;
2508 va_offset += data_len;
2509 data_left -= data_len;
2510 }
2511
2512 return 0;
2513 unmap_cmd:
2514 isert_unmap_data_buf(isert_conn, data);
2515
2516 return ret;
2517 }
2518
2519 static int
2520 isert_map_fr_pagelist(struct ib_device *ib_dev,
2521 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2522 {
2523 u64 start_addr, end_addr, page, chunk_start = 0;
2524 struct scatterlist *tmp_sg;
2525 int i = 0, new_chunk, last_ent, n_pages;
2526
2527 n_pages = 0;
2528 new_chunk = 1;
2529 last_ent = sg_nents - 1;
2530 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2531 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2532 if (new_chunk)
2533 chunk_start = start_addr;
2534 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2535
2536 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
2537 i, (unsigned long long)tmp_sg->dma_address,
2538 tmp_sg->length);
2539
2540 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2541 new_chunk = 0;
2542 continue;
2543 }
2544 new_chunk = 1;
2545
2546 page = chunk_start & PAGE_MASK;
2547 do {
2548 fr_pl[n_pages++] = page;
2549 isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
2550 n_pages - 1, page);
2551 page += PAGE_SIZE;
2552 } while (page < end_addr);
2553 }
2554
2555 return n_pages;
2556 }
2557
2558 static inline void
2559 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2560 {
2561 u32 rkey;
2562
2563 memset(inv_wr, 0, sizeof(*inv_wr));
2564 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2565 inv_wr->opcode = IB_WR_LOCAL_INV;
2566 inv_wr->ex.invalidate_rkey = mr->rkey;
2567
2568 /* Bump the key */
2569 rkey = ib_inc_rkey(mr->rkey);
2570 ib_update_fast_reg_key(mr, rkey);
2571 }
2572
2573 static int
2574 isert_fast_reg_mr(struct isert_conn *isert_conn,
2575 struct fast_reg_descriptor *fr_desc,
2576 struct isert_data_buf *mem,
2577 enum isert_indicator ind,
2578 struct ib_sge *sge)
2579 {
2580 struct isert_device *device = isert_conn->device;
2581 struct ib_device *ib_dev = device->ib_device;
2582 struct ib_mr *mr;
2583 struct ib_fast_reg_page_list *frpl;
2584 struct ib_send_wr fr_wr, inv_wr;
2585 struct ib_send_wr *bad_wr, *wr = NULL;
2586 int ret, pagelist_len;
2587 u32 page_off;
2588
2589 if (mem->dma_nents == 1) {
2590 sge->lkey = device->pd->local_dma_lkey;
2591 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2592 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2593 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2594 sge->addr, sge->length, sge->lkey);
2595 return 0;
2596 }
2597
2598 if (ind == ISERT_DATA_KEY_VALID) {
2599 /* Registering data buffer */
2600 mr = fr_desc->data_mr;
2601 frpl = fr_desc->data_frpl;
2602 } else {
2603 /* Registering protection buffer */
2604 mr = fr_desc->pi_ctx->prot_mr;
2605 frpl = fr_desc->pi_ctx->prot_frpl;
2606 }
2607
2608 page_off = mem->offset % PAGE_SIZE;
2609
2610 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2611 fr_desc, mem->nents, mem->offset);
2612
2613 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2614 &frpl->page_list[0]);
2615
2616 if (!(fr_desc->ind & ind)) {
2617 isert_inv_rkey(&inv_wr, mr);
2618 wr = &inv_wr;
2619 }
2620
2621 /* Prepare FASTREG WR */
2622 memset(&fr_wr, 0, sizeof(fr_wr));
2623 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2624 fr_wr.opcode = IB_WR_FAST_REG_MR;
2625 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2626 fr_wr.wr.fast_reg.page_list = frpl;
2627 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2628 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2629 fr_wr.wr.fast_reg.length = mem->len;
2630 fr_wr.wr.fast_reg.rkey = mr->rkey;
2631 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2632
2633 if (!wr)
2634 wr = &fr_wr;
2635 else
2636 wr->next = &fr_wr;
2637
2638 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2639 if (ret) {
2640 isert_err("fast registration failed, ret:%d\n", ret);
2641 return ret;
2642 }
2643 fr_desc->ind &= ~ind;
2644
2645 sge->lkey = mr->lkey;
2646 sge->addr = frpl->page_list[0] + page_off;
2647 sge->length = mem->len;
2648
2649 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2650 sge->addr, sge->length, sge->lkey);
2651
2652 return ret;
2653 }
2654
2655 static inline void
2656 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2657 struct ib_sig_domain *domain)
2658 {
2659 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2660 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2661 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2662 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2663 /*
2664 * At the moment we hard code those, but if in the future
2665 * the target core would like to use it, we will take it
2666 * from se_cmd.
2667 */
2668 domain->sig.dif.apptag_check_mask = 0xffff;
2669 domain->sig.dif.app_escape = true;
2670 domain->sig.dif.ref_escape = true;
2671 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2672 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2673 domain->sig.dif.ref_remap = true;
2674 };
2675
2676 static int
2677 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2678 {
2679 switch (se_cmd->prot_op) {
2680 case TARGET_PROT_DIN_INSERT:
2681 case TARGET_PROT_DOUT_STRIP:
2682 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2683 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2684 break;
2685 case TARGET_PROT_DOUT_INSERT:
2686 case TARGET_PROT_DIN_STRIP:
2687 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2688 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2689 break;
2690 case TARGET_PROT_DIN_PASS:
2691 case TARGET_PROT_DOUT_PASS:
2692 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2693 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2694 break;
2695 default:
2696 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2697 return -EINVAL;
2698 }
2699
2700 return 0;
2701 }
2702
2703 static inline u8
2704 isert_set_prot_checks(u8 prot_checks)
2705 {
2706 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2707 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2708 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2709 }
2710
2711 static int
2712 isert_reg_sig_mr(struct isert_conn *isert_conn,
2713 struct se_cmd *se_cmd,
2714 struct isert_rdma_wr *rdma_wr,
2715 struct fast_reg_descriptor *fr_desc)
2716 {
2717 struct ib_send_wr sig_wr, inv_wr;
2718 struct ib_send_wr *bad_wr, *wr = NULL;
2719 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2720 struct ib_sig_attrs sig_attrs;
2721 int ret;
2722
2723 memset(&sig_attrs, 0, sizeof(sig_attrs));
2724 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2725 if (ret)
2726 goto err;
2727
2728 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2729
2730 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2731 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2732 wr = &inv_wr;
2733 }
2734
2735 memset(&sig_wr, 0, sizeof(sig_wr));
2736 sig_wr.opcode = IB_WR_REG_SIG_MR;
2737 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2738 sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2739 sig_wr.num_sge = 1;
2740 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2741 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2742 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2743 if (se_cmd->t_prot_sg)
2744 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2745
2746 if (!wr)
2747 wr = &sig_wr;
2748 else
2749 wr->next = &sig_wr;
2750
2751 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2752 if (ret) {
2753 isert_err("fast registration failed, ret:%d\n", ret);
2754 goto err;
2755 }
2756 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2757
2758 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2759 rdma_wr->ib_sg[SIG].addr = 0;
2760 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2761 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2762 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2763 /*
2764 * We have protection guards on the wire
2765 * so we need to set a larget transfer
2766 */
2767 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2768
2769 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2770 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2771 rdma_wr->ib_sg[SIG].lkey);
2772 err:
2773 return ret;
2774 }
2775
2776 static int
2777 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2778 struct isert_cmd *isert_cmd,
2779 struct isert_rdma_wr *wr)
2780 {
2781 struct isert_device *device = isert_conn->device;
2782 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2783 int ret;
2784
2785 if (!wr->fr_desc->pi_ctx) {
2786 ret = isert_create_pi_ctx(wr->fr_desc,
2787 device->ib_device,
2788 device->pd);
2789 if (ret) {
2790 isert_err("conn %p failed to allocate pi_ctx\n",
2791 isert_conn);
2792 return ret;
2793 }
2794 }
2795
2796 if (se_cmd->t_prot_sg) {
2797 ret = isert_map_data_buf(isert_conn, isert_cmd,
2798 se_cmd->t_prot_sg,
2799 se_cmd->t_prot_nents,
2800 se_cmd->prot_length,
2801 0, wr->iser_ib_op, &wr->prot);
2802 if (ret) {
2803 isert_err("conn %p failed to map protection buffer\n",
2804 isert_conn);
2805 return ret;
2806 }
2807
2808 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2809 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2810 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2811 if (ret) {
2812 isert_err("conn %p failed to fast reg mr\n",
2813 isert_conn);
2814 goto unmap_prot_cmd;
2815 }
2816 }
2817
2818 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2819 if (ret) {
2820 isert_err("conn %p failed to fast reg mr\n",
2821 isert_conn);
2822 goto unmap_prot_cmd;
2823 }
2824 wr->fr_desc->ind |= ISERT_PROTECTED;
2825
2826 return 0;
2827
2828 unmap_prot_cmd:
2829 if (se_cmd->t_prot_sg)
2830 isert_unmap_data_buf(isert_conn, &wr->prot);
2831
2832 return ret;
2833 }
2834
2835 static int
2836 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2837 struct isert_rdma_wr *wr)
2838 {
2839 struct se_cmd *se_cmd = &cmd->se_cmd;
2840 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2841 struct isert_conn *isert_conn = conn->context;
2842 struct fast_reg_descriptor *fr_desc = NULL;
2843 struct ib_send_wr *send_wr;
2844 struct ib_sge *ib_sg;
2845 u32 offset;
2846 int ret = 0;
2847 unsigned long flags;
2848
2849 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2850
2851 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2852 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2853 se_cmd->t_data_nents, se_cmd->data_length,
2854 offset, wr->iser_ib_op, &wr->data);
2855 if (ret)
2856 return ret;
2857
2858 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2859 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2860 fr_desc = list_first_entry(&isert_conn->fr_pool,
2861 struct fast_reg_descriptor, list);
2862 list_del(&fr_desc->list);
2863 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2864 wr->fr_desc = fr_desc;
2865 }
2866
2867 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2868 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2869 if (ret)
2870 goto unmap_cmd;
2871
2872 if (isert_prot_cmd(isert_conn, se_cmd)) {
2873 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2874 if (ret)
2875 goto unmap_cmd;
2876
2877 ib_sg = &wr->ib_sg[SIG];
2878 } else {
2879 ib_sg = &wr->ib_sg[DATA];
2880 }
2881
2882 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2883 wr->ib_sge = &wr->s_ib_sge;
2884 wr->send_wr_num = 1;
2885 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2886 wr->send_wr = &wr->s_send_wr;
2887 wr->isert_cmd = isert_cmd;
2888
2889 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2890 send_wr->sg_list = &wr->s_ib_sge;
2891 send_wr->num_sge = 1;
2892 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2893 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2894 send_wr->opcode = IB_WR_RDMA_WRITE;
2895 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2896 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2897 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2898 0 : IB_SEND_SIGNALED;
2899 } else {
2900 send_wr->opcode = IB_WR_RDMA_READ;
2901 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2902 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2903 send_wr->send_flags = IB_SEND_SIGNALED;
2904 }
2905
2906 return 0;
2907
2908 unmap_cmd:
2909 if (fr_desc) {
2910 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2911 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2912 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2913 }
2914 isert_unmap_data_buf(isert_conn, &wr->data);
2915
2916 return ret;
2917 }
2918
2919 static int
2920 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2921 {
2922 struct se_cmd *se_cmd = &cmd->se_cmd;
2923 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2924 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2925 struct isert_conn *isert_conn = conn->context;
2926 struct isert_device *device = isert_conn->device;
2927 struct ib_send_wr *wr_failed;
2928 int rc;
2929
2930 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2931 isert_cmd, se_cmd->data_length);
2932
2933 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2934 rc = device->reg_rdma_mem(conn, cmd, wr);
2935 if (rc) {
2936 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2937 return rc;
2938 }
2939
2940 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2941 /*
2942 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2943 */
2944 isert_create_send_desc(isert_conn, isert_cmd,
2945 &isert_cmd->tx_desc);
2946 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2947 &isert_cmd->tx_desc.iscsi_header);
2948 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2949 isert_init_send_wr(isert_conn, isert_cmd,
2950 &isert_cmd->tx_desc.send_wr);
2951 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2952 wr->send_wr_num += 1;
2953 }
2954
2955 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2956 if (rc)
2957 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2958
2959 if (!isert_prot_cmd(isert_conn, se_cmd))
2960 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2961 "READ\n", isert_cmd);
2962 else
2963 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2964 isert_cmd);
2965
2966 return 1;
2967 }
2968
2969 static int
2970 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2971 {
2972 struct se_cmd *se_cmd = &cmd->se_cmd;
2973 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2974 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2975 struct isert_conn *isert_conn = conn->context;
2976 struct isert_device *device = isert_conn->device;
2977 struct ib_send_wr *wr_failed;
2978 int rc;
2979
2980 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2981 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2982 wr->iser_ib_op = ISER_IB_RDMA_READ;
2983 rc = device->reg_rdma_mem(conn, cmd, wr);
2984 if (rc) {
2985 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2986 return rc;
2987 }
2988
2989 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2990 if (rc)
2991 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2992
2993 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2994 isert_cmd);
2995
2996 return 0;
2997 }
2998
2999 static int
3000 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3001 {
3002 int ret;
3003
3004 switch (state) {
3005 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3006 ret = isert_put_nopin(cmd, conn, false);
3007 break;
3008 default:
3009 isert_err("Unknown immediate state: 0x%02x\n", state);
3010 ret = -EINVAL;
3011 break;
3012 }
3013
3014 return ret;
3015 }
3016
3017 static int
3018 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3019 {
3020 struct isert_conn *isert_conn = conn->context;
3021 int ret;
3022
3023 switch (state) {
3024 case ISTATE_SEND_LOGOUTRSP:
3025 ret = isert_put_logout_rsp(cmd, conn);
3026 if (!ret)
3027 isert_conn->logout_posted = true;
3028 break;
3029 case ISTATE_SEND_NOPIN:
3030 ret = isert_put_nopin(cmd, conn, true);
3031 break;
3032 case ISTATE_SEND_TASKMGTRSP:
3033 ret = isert_put_tm_rsp(cmd, conn);
3034 break;
3035 case ISTATE_SEND_REJECT:
3036 ret = isert_put_reject(cmd, conn);
3037 break;
3038 case ISTATE_SEND_TEXTRSP:
3039 ret = isert_put_text_rsp(cmd, conn);
3040 break;
3041 case ISTATE_SEND_STATUS:
3042 /*
3043 * Special case for sending non GOOD SCSI status from TX thread
3044 * context during pre se_cmd excecution failure.
3045 */
3046 ret = isert_put_response(conn, cmd);
3047 break;
3048 default:
3049 isert_err("Unknown response state: 0x%02x\n", state);
3050 ret = -EINVAL;
3051 break;
3052 }
3053
3054 return ret;
3055 }
3056
3057 struct rdma_cm_id *
3058 isert_setup_id(struct isert_np *isert_np)
3059 {
3060 struct iscsi_np *np = isert_np->np;
3061 struct rdma_cm_id *id;
3062 struct sockaddr *sa;
3063 int ret;
3064
3065 sa = (struct sockaddr *)&np->np_sockaddr;
3066 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3067
3068 id = rdma_create_id(isert_cma_handler, isert_np,
3069 RDMA_PS_TCP, IB_QPT_RC);
3070 if (IS_ERR(id)) {
3071 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3072 ret = PTR_ERR(id);
3073 goto out;
3074 }
3075 isert_dbg("id %p context %p\n", id, id->context);
3076
3077 ret = rdma_bind_addr(id, sa);
3078 if (ret) {
3079 isert_err("rdma_bind_addr() failed: %d\n", ret);
3080 goto out_id;
3081 }
3082
3083 ret = rdma_listen(id, 0);
3084 if (ret) {
3085 isert_err("rdma_listen() failed: %d\n", ret);
3086 goto out_id;
3087 }
3088
3089 return id;
3090 out_id:
3091 rdma_destroy_id(id);
3092 out:
3093 return ERR_PTR(ret);
3094 }
3095
3096 static int
3097 isert_setup_np(struct iscsi_np *np,
3098 struct sockaddr_storage *ksockaddr)
3099 {
3100 struct isert_np *isert_np;
3101 struct rdma_cm_id *isert_lid;
3102 int ret;
3103
3104 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3105 if (!isert_np) {
3106 isert_err("Unable to allocate struct isert_np\n");
3107 return -ENOMEM;
3108 }
3109 sema_init(&isert_np->np_sem, 0);
3110 mutex_init(&isert_np->np_accept_mutex);
3111 INIT_LIST_HEAD(&isert_np->np_accept_list);
3112 init_completion(&isert_np->np_login_comp);
3113 isert_np->np = np;
3114
3115 /*
3116 * Setup the np->np_sockaddr from the passed sockaddr setup
3117 * in iscsi_target_configfs.c code..
3118 */
3119 memcpy(&np->np_sockaddr, ksockaddr,
3120 sizeof(struct sockaddr_storage));
3121
3122 isert_lid = isert_setup_id(isert_np);
3123 if (IS_ERR(isert_lid)) {
3124 ret = PTR_ERR(isert_lid);
3125 goto out;
3126 }
3127
3128 isert_np->np_cm_id = isert_lid;
3129 np->np_context = isert_np;
3130
3131 return 0;
3132
3133 out:
3134 kfree(isert_np);
3135
3136 return ret;
3137 }
3138
3139 static int
3140 isert_rdma_accept(struct isert_conn *isert_conn)
3141 {
3142 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3143 struct rdma_conn_param cp;
3144 int ret;
3145
3146 memset(&cp, 0, sizeof(struct rdma_conn_param));
3147 cp.initiator_depth = isert_conn->initiator_depth;
3148 cp.retry_count = 7;
3149 cp.rnr_retry_count = 7;
3150
3151 ret = rdma_accept(cm_id, &cp);
3152 if (ret) {
3153 isert_err("rdma_accept() failed with: %d\n", ret);
3154 return ret;
3155 }
3156
3157 return 0;
3158 }
3159
3160 static int
3161 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3162 {
3163 struct isert_conn *isert_conn = conn->context;
3164 int ret;
3165
3166 isert_info("before login_req comp conn: %p\n", isert_conn);
3167 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3168 if (ret) {
3169 isert_err("isert_conn %p interrupted before got login req\n",
3170 isert_conn);
3171 return ret;
3172 }
3173 reinit_completion(&isert_conn->login_req_comp);
3174
3175 /*
3176 * For login requests after the first PDU, isert_rx_login_req() will
3177 * kick schedule_delayed_work(&conn->login_work) as the packet is
3178 * received, which turns this callback from iscsi_target_do_login_rx()
3179 * into a NOP.
3180 */
3181 if (!login->first_request)
3182 return 0;
3183
3184 isert_rx_login_req(isert_conn);
3185
3186 isert_info("before login_comp conn: %p\n", conn);
3187 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3188 if (ret)
3189 return ret;
3190
3191 isert_info("processing login->req: %p\n", login->req);
3192
3193 return 0;
3194 }
3195
3196 static void
3197 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3198 struct isert_conn *isert_conn)
3199 {
3200 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3201 struct rdma_route *cm_route = &cm_id->route;
3202
3203 conn->login_family = np->np_sockaddr.ss_family;
3204
3205 conn->login_sockaddr = cm_route->addr.dst_addr;
3206 conn->local_sockaddr = cm_route->addr.src_addr;
3207 }
3208
3209 static int
3210 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3211 {
3212 struct isert_np *isert_np = np->np_context;
3213 struct isert_conn *isert_conn;
3214 int ret;
3215
3216 accept_wait:
3217 ret = down_interruptible(&isert_np->np_sem);
3218 if (ret)
3219 return -ENODEV;
3220
3221 spin_lock_bh(&np->np_thread_lock);
3222 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3223 spin_unlock_bh(&np->np_thread_lock);
3224 isert_dbg("np_thread_state %d\n",
3225 np->np_thread_state);
3226 /**
3227 * No point in stalling here when np_thread
3228 * is in state RESET/SHUTDOWN/EXIT - bail
3229 **/
3230 return -ENODEV;
3231 }
3232 spin_unlock_bh(&np->np_thread_lock);
3233
3234 mutex_lock(&isert_np->np_accept_mutex);
3235 if (list_empty(&isert_np->np_accept_list)) {
3236 mutex_unlock(&isert_np->np_accept_mutex);
3237 goto accept_wait;
3238 }
3239 isert_conn = list_first_entry(&isert_np->np_accept_list,
3240 struct isert_conn, accept_node);
3241 list_del_init(&isert_conn->accept_node);
3242 mutex_unlock(&isert_np->np_accept_mutex);
3243
3244 conn->context = isert_conn;
3245 isert_conn->conn = conn;
3246
3247 isert_set_conn_info(np, conn, isert_conn);
3248
3249 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3250
3251 return 0;
3252 }
3253
3254 static void
3255 isert_free_np(struct iscsi_np *np)
3256 {
3257 struct isert_np *isert_np = np->np_context;
3258 struct isert_conn *isert_conn, *n;
3259
3260 if (isert_np->np_cm_id)
3261 rdma_destroy_id(isert_np->np_cm_id);
3262
3263 /*
3264 * FIXME: At this point we don't have a good way to insure
3265 * that at this point we don't have hanging connections that
3266 * completed RDMA establishment but didn't start iscsi login
3267 * process. So work-around this by cleaning up what ever piled
3268 * up in np_accept_list.
3269 */
3270 mutex_lock(&isert_np->np_accept_mutex);
3271 if (!list_empty(&isert_np->np_accept_list)) {
3272 isert_info("Still have isert connections, cleaning up...\n");
3273 list_for_each_entry_safe(isert_conn, n,
3274 &isert_np->np_accept_list,
3275 accept_node) {
3276 isert_info("cleaning isert_conn %p state (%d)\n",
3277 isert_conn, isert_conn->state);
3278 isert_connect_release(isert_conn);
3279 }
3280 }
3281 mutex_unlock(&isert_np->np_accept_mutex);
3282
3283 np->np_context = NULL;
3284 kfree(isert_np);
3285 }
3286
3287 static void isert_release_work(struct work_struct *work)
3288 {
3289 struct isert_conn *isert_conn = container_of(work,
3290 struct isert_conn,
3291 release_work);
3292
3293 isert_info("Starting release conn %p\n", isert_conn);
3294
3295 wait_for_completion(&isert_conn->wait);
3296
3297 mutex_lock(&isert_conn->mutex);
3298 isert_conn->state = ISER_CONN_DOWN;
3299 mutex_unlock(&isert_conn->mutex);
3300
3301 isert_info("Destroying conn %p\n", isert_conn);
3302 isert_put_conn(isert_conn);
3303 }
3304
3305 static void
3306 isert_wait4logout(struct isert_conn *isert_conn)
3307 {
3308 struct iscsi_conn *conn = isert_conn->conn;
3309
3310 isert_info("conn %p\n", isert_conn);
3311
3312 if (isert_conn->logout_posted) {
3313 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3314 wait_for_completion_timeout(&conn->conn_logout_comp,
3315 SECONDS_FOR_LOGOUT_COMP * HZ);
3316 }
3317 }
3318
3319 static void
3320 isert_wait4cmds(struct iscsi_conn *conn)
3321 {
3322 isert_info("iscsi_conn %p\n", conn);
3323
3324 if (conn->sess) {
3325 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3326 target_wait_for_sess_cmds(conn->sess->se_sess);
3327 }
3328 }
3329
3330 static void
3331 isert_wait4flush(struct isert_conn *isert_conn)
3332 {
3333 struct ib_recv_wr *bad_wr;
3334
3335 isert_info("conn %p\n", isert_conn);
3336
3337 init_completion(&isert_conn->wait_comp_err);
3338 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3339 /* post an indication that all flush errors were consumed */
3340 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3341 isert_err("conn %p failed to post beacon", isert_conn);
3342 return;
3343 }
3344
3345 wait_for_completion(&isert_conn->wait_comp_err);
3346 }
3347
3348 static void isert_wait_conn(struct iscsi_conn *conn)
3349 {
3350 struct isert_conn *isert_conn = conn->context;
3351
3352 isert_info("Starting conn %p\n", isert_conn);
3353
3354 mutex_lock(&isert_conn->mutex);
3355 /*
3356 * Only wait for wait_comp_err if the isert_conn made it
3357 * into full feature phase..
3358 */
3359 if (isert_conn->state == ISER_CONN_INIT) {
3360 mutex_unlock(&isert_conn->mutex);
3361 return;
3362 }
3363 isert_conn_terminate(isert_conn);
3364 mutex_unlock(&isert_conn->mutex);
3365
3366 isert_wait4cmds(conn);
3367 isert_wait4flush(isert_conn);
3368 isert_wait4logout(isert_conn);
3369
3370 queue_work(isert_release_wq, &isert_conn->release_work);
3371 }
3372
3373 static void isert_free_conn(struct iscsi_conn *conn)
3374 {
3375 struct isert_conn *isert_conn = conn->context;
3376
3377 isert_wait4flush(isert_conn);
3378 isert_put_conn(isert_conn);
3379 }
3380
3381 static struct iscsit_transport iser_target_transport = {
3382 .name = "IB/iSER",
3383 .transport_type = ISCSI_INFINIBAND,
3384 .priv_size = sizeof(struct isert_cmd),
3385 .owner = THIS_MODULE,
3386 .iscsit_setup_np = isert_setup_np,
3387 .iscsit_accept_np = isert_accept_np,
3388 .iscsit_free_np = isert_free_np,
3389 .iscsit_wait_conn = isert_wait_conn,
3390 .iscsit_free_conn = isert_free_conn,
3391 .iscsit_get_login_rx = isert_get_login_rx,
3392 .iscsit_put_login_tx = isert_put_login_tx,
3393 .iscsit_immediate_queue = isert_immediate_queue,
3394 .iscsit_response_queue = isert_response_queue,
3395 .iscsit_get_dataout = isert_get_dataout,
3396 .iscsit_queue_data_in = isert_put_datain,
3397 .iscsit_queue_status = isert_put_response,
3398 .iscsit_aborted_task = isert_aborted_task,
3399 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3400 };
3401
3402 static int __init isert_init(void)
3403 {
3404 int ret;
3405
3406 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3407 WQ_UNBOUND | WQ_HIGHPRI, 0);
3408 if (!isert_comp_wq) {
3409 isert_err("Unable to allocate isert_comp_wq\n");
3410 ret = -ENOMEM;
3411 return -ENOMEM;
3412 }
3413
3414 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3415 WQ_UNBOUND_MAX_ACTIVE);
3416 if (!isert_release_wq) {
3417 isert_err("Unable to allocate isert_release_wq\n");
3418 ret = -ENOMEM;
3419 goto destroy_comp_wq;
3420 }
3421
3422 iscsit_register_transport(&iser_target_transport);
3423 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3424
3425 return 0;
3426
3427 destroy_comp_wq:
3428 destroy_workqueue(isert_comp_wq);
3429
3430 return ret;
3431 }
3432
3433 static void __exit isert_exit(void)
3434 {
3435 flush_scheduled_work();
3436 destroy_workqueue(isert_release_wq);
3437 destroy_workqueue(isert_comp_wq);
3438 iscsit_unregister_transport(&iser_target_transport);
3439 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3440 }
3441
3442 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3443 MODULE_VERSION("1.0");
3444 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3445 MODULE_LICENSE("GPL");
3446
3447 module_init(isert_init);
3448 module_exit(isert_exit);
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