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iser-target: Remove explicit mlx4 work-around
[deliverable/linux.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 attr.cap.max_send_sge = device->dev_attr.max_sge;
161 isert_conn->max_sge = min(device->dev_attr.max_sge,
162 device->dev_attr.max_sge_rd);
163 attr.cap.max_recv_sge = 1;
164 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
165 attr.qp_type = IB_QPT_RC;
166 if (device->pi_capable)
167 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
168
169 ret = rdma_create_qp(cma_id, device->pd, &attr);
170 if (ret) {
171 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
172 return ERR_PTR(ret);
173 }
174
175 return cma_id->qp;
176 }
177
178 static int
179 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
180 {
181 struct isert_comp *comp;
182 int ret;
183
184 comp = isert_comp_get(isert_conn);
185 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
186 if (IS_ERR(isert_conn->qp)) {
187 ret = PTR_ERR(isert_conn->qp);
188 goto err;
189 }
190
191 return 0;
192 err:
193 isert_comp_put(comp);
194 return ret;
195 }
196
197 static void
198 isert_cq_event_callback(struct ib_event *e, void *context)
199 {
200 isert_dbg("event: %d\n", e->event);
201 }
202
203 static int
204 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
205 {
206 struct isert_device *device = isert_conn->device;
207 struct ib_device *ib_dev = device->ib_device;
208 struct iser_rx_desc *rx_desc;
209 struct ib_sge *rx_sg;
210 u64 dma_addr;
211 int i, j;
212
213 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
214 sizeof(struct iser_rx_desc), GFP_KERNEL);
215 if (!isert_conn->rx_descs)
216 goto fail;
217
218 rx_desc = isert_conn->rx_descs;
219
220 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
221 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
222 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
223 if (ib_dma_mapping_error(ib_dev, dma_addr))
224 goto dma_map_fail;
225
226 rx_desc->dma_addr = dma_addr;
227
228 rx_sg = &rx_desc->rx_sg;
229 rx_sg->addr = rx_desc->dma_addr;
230 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
231 rx_sg->lkey = device->pd->local_dma_lkey;
232 }
233
234 return 0;
235
236 dma_map_fail:
237 rx_desc = isert_conn->rx_descs;
238 for (j = 0; j < i; j++, rx_desc++) {
239 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
240 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
241 }
242 kfree(isert_conn->rx_descs);
243 isert_conn->rx_descs = NULL;
244 fail:
245 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
246
247 return -ENOMEM;
248 }
249
250 static void
251 isert_free_rx_descriptors(struct isert_conn *isert_conn)
252 {
253 struct ib_device *ib_dev = isert_conn->device->ib_device;
254 struct iser_rx_desc *rx_desc;
255 int i;
256
257 if (!isert_conn->rx_descs)
258 return;
259
260 rx_desc = isert_conn->rx_descs;
261 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
262 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
263 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
264 }
265
266 kfree(isert_conn->rx_descs);
267 isert_conn->rx_descs = NULL;
268 }
269
270 static void isert_cq_work(struct work_struct *);
271 static void isert_cq_callback(struct ib_cq *, void *);
272
273 static void
274 isert_free_comps(struct isert_device *device)
275 {
276 int i;
277
278 for (i = 0; i < device->comps_used; i++) {
279 struct isert_comp *comp = &device->comps[i];
280
281 if (comp->cq) {
282 cancel_work_sync(&comp->work);
283 ib_destroy_cq(comp->cq);
284 }
285 }
286 kfree(device->comps);
287 }
288
289 static int
290 isert_alloc_comps(struct isert_device *device,
291 struct ib_device_attr *attr)
292 {
293 int i, max_cqe, ret = 0;
294
295 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
296 device->ib_device->num_comp_vectors));
297
298 isert_info("Using %d CQs, %s supports %d vectors support "
299 "Fast registration %d pi_capable %d\n",
300 device->comps_used, device->ib_device->name,
301 device->ib_device->num_comp_vectors, device->use_fastreg,
302 device->pi_capable);
303
304 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
305 GFP_KERNEL);
306 if (!device->comps) {
307 isert_err("Unable to allocate completion contexts\n");
308 return -ENOMEM;
309 }
310
311 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
312
313 for (i = 0; i < device->comps_used; i++) {
314 struct ib_cq_init_attr cq_attr = {};
315 struct isert_comp *comp = &device->comps[i];
316
317 comp->device = device;
318 INIT_WORK(&comp->work, isert_cq_work);
319 cq_attr.cqe = max_cqe;
320 cq_attr.comp_vector = i;
321 comp->cq = ib_create_cq(device->ib_device,
322 isert_cq_callback,
323 isert_cq_event_callback,
324 (void *)comp,
325 &cq_attr);
326 if (IS_ERR(comp->cq)) {
327 isert_err("Unable to allocate cq\n");
328 ret = PTR_ERR(comp->cq);
329 comp->cq = NULL;
330 goto out_cq;
331 }
332
333 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
334 if (ret)
335 goto out_cq;
336 }
337
338 return 0;
339 out_cq:
340 isert_free_comps(device);
341 return ret;
342 }
343
344 static int
345 isert_create_device_ib_res(struct isert_device *device)
346 {
347 struct ib_device_attr *dev_attr;
348 int ret;
349
350 dev_attr = &device->dev_attr;
351 ret = isert_query_device(device->ib_device, dev_attr);
352 if (ret)
353 return ret;
354
355 /* asign function handlers */
356 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
357 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
358 device->use_fastreg = 1;
359 device->reg_rdma_mem = isert_reg_rdma;
360 device->unreg_rdma_mem = isert_unreg_rdma;
361 } else {
362 device->use_fastreg = 0;
363 device->reg_rdma_mem = isert_map_rdma;
364 device->unreg_rdma_mem = isert_unmap_cmd;
365 }
366
367 ret = isert_alloc_comps(device, dev_attr);
368 if (ret)
369 return ret;
370
371 device->pd = ib_alloc_pd(device->ib_device);
372 if (IS_ERR(device->pd)) {
373 ret = PTR_ERR(device->pd);
374 isert_err("failed to allocate pd, device %p, ret=%d\n",
375 device, ret);
376 goto out_cq;
377 }
378
379 /* Check signature cap */
380 device->pi_capable = dev_attr->device_cap_flags &
381 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
382
383 return 0;
384
385 out_cq:
386 isert_free_comps(device);
387 return ret;
388 }
389
390 static void
391 isert_free_device_ib_res(struct isert_device *device)
392 {
393 isert_info("device %p\n", device);
394
395 ib_dealloc_pd(device->pd);
396 isert_free_comps(device);
397 }
398
399 static void
400 isert_device_put(struct isert_device *device)
401 {
402 mutex_lock(&device_list_mutex);
403 device->refcount--;
404 isert_info("device %p refcount %d\n", device, device->refcount);
405 if (!device->refcount) {
406 isert_free_device_ib_res(device);
407 list_del(&device->dev_node);
408 kfree(device);
409 }
410 mutex_unlock(&device_list_mutex);
411 }
412
413 static struct isert_device *
414 isert_device_get(struct rdma_cm_id *cma_id)
415 {
416 struct isert_device *device;
417 int ret;
418
419 mutex_lock(&device_list_mutex);
420 list_for_each_entry(device, &device_list, dev_node) {
421 if (device->ib_device->node_guid == cma_id->device->node_guid) {
422 device->refcount++;
423 isert_info("Found iser device %p refcount %d\n",
424 device, device->refcount);
425 mutex_unlock(&device_list_mutex);
426 return device;
427 }
428 }
429
430 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
431 if (!device) {
432 mutex_unlock(&device_list_mutex);
433 return ERR_PTR(-ENOMEM);
434 }
435
436 INIT_LIST_HEAD(&device->dev_node);
437
438 device->ib_device = cma_id->device;
439 ret = isert_create_device_ib_res(device);
440 if (ret) {
441 kfree(device);
442 mutex_unlock(&device_list_mutex);
443 return ERR_PTR(ret);
444 }
445
446 device->refcount++;
447 list_add_tail(&device->dev_node, &device_list);
448 isert_info("Created a new iser device %p refcount %d\n",
449 device, device->refcount);
450 mutex_unlock(&device_list_mutex);
451
452 return device;
453 }
454
455 static void
456 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
457 {
458 struct fast_reg_descriptor *fr_desc, *tmp;
459 int i = 0;
460
461 if (list_empty(&isert_conn->fr_pool))
462 return;
463
464 isert_info("Freeing conn %p fastreg pool", isert_conn);
465
466 list_for_each_entry_safe(fr_desc, tmp,
467 &isert_conn->fr_pool, list) {
468 list_del(&fr_desc->list);
469 ib_dereg_mr(fr_desc->data_mr);
470 if (fr_desc->pi_ctx) {
471 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
472 ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
473 kfree(fr_desc->pi_ctx);
474 }
475 kfree(fr_desc);
476 ++i;
477 }
478
479 if (i < isert_conn->fr_pool_size)
480 isert_warn("Pool still has %d regions registered\n",
481 isert_conn->fr_pool_size - i);
482 }
483
484 static int
485 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
486 struct ib_device *device,
487 struct ib_pd *pd)
488 {
489 struct pi_context *pi_ctx;
490 int ret;
491
492 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
493 if (!pi_ctx) {
494 isert_err("Failed to allocate pi context\n");
495 return -ENOMEM;
496 }
497
498 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
499 ISCSI_ISER_SG_TABLESIZE);
500 if (IS_ERR(pi_ctx->prot_mr)) {
501 isert_err("Failed to allocate prot frmr err=%ld\n",
502 PTR_ERR(pi_ctx->prot_mr));
503 ret = PTR_ERR(pi_ctx->prot_mr);
504 goto err_pi_ctx;
505 }
506 desc->ind |= ISERT_PROT_KEY_VALID;
507
508 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
509 if (IS_ERR(pi_ctx->sig_mr)) {
510 isert_err("Failed to allocate signature enabled mr err=%ld\n",
511 PTR_ERR(pi_ctx->sig_mr));
512 ret = PTR_ERR(pi_ctx->sig_mr);
513 goto err_prot_mr;
514 }
515
516 desc->pi_ctx = pi_ctx;
517 desc->ind |= ISERT_SIG_KEY_VALID;
518 desc->ind &= ~ISERT_PROTECTED;
519
520 return 0;
521
522 err_prot_mr:
523 ib_dereg_mr(pi_ctx->prot_mr);
524 err_pi_ctx:
525 kfree(pi_ctx);
526
527 return ret;
528 }
529
530 static int
531 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
532 struct fast_reg_descriptor *fr_desc)
533 {
534 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
535 ISCSI_ISER_SG_TABLESIZE);
536 if (IS_ERR(fr_desc->data_mr)) {
537 isert_err("Failed to allocate data frmr err=%ld\n",
538 PTR_ERR(fr_desc->data_mr));
539 return PTR_ERR(fr_desc->data_mr);
540 }
541 fr_desc->ind |= ISERT_DATA_KEY_VALID;
542
543 isert_dbg("Created fr_desc %p\n", fr_desc);
544
545 return 0;
546 }
547
548 static int
549 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
550 {
551 struct fast_reg_descriptor *fr_desc;
552 struct isert_device *device = isert_conn->device;
553 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
554 struct se_node_acl *se_nacl = se_sess->se_node_acl;
555 int i, ret, tag_num;
556 /*
557 * Setup the number of FRMRs based upon the number of tags
558 * available to session in iscsi_target_locate_portal().
559 */
560 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
561 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
562
563 isert_conn->fr_pool_size = 0;
564 for (i = 0; i < tag_num; i++) {
565 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
566 if (!fr_desc) {
567 isert_err("Failed to allocate fast_reg descriptor\n");
568 ret = -ENOMEM;
569 goto err;
570 }
571
572 ret = isert_create_fr_desc(device->ib_device,
573 device->pd, fr_desc);
574 if (ret) {
575 isert_err("Failed to create fastreg descriptor err=%d\n",
576 ret);
577 kfree(fr_desc);
578 goto err;
579 }
580
581 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
582 isert_conn->fr_pool_size++;
583 }
584
585 isert_dbg("Creating conn %p fastreg pool size=%d",
586 isert_conn, isert_conn->fr_pool_size);
587
588 return 0;
589
590 err:
591 isert_conn_free_fastreg_pool(isert_conn);
592 return ret;
593 }
594
595 static void
596 isert_init_conn(struct isert_conn *isert_conn)
597 {
598 isert_conn->state = ISER_CONN_INIT;
599 INIT_LIST_HEAD(&isert_conn->node);
600 init_completion(&isert_conn->login_comp);
601 init_completion(&isert_conn->login_req_comp);
602 init_completion(&isert_conn->wait);
603 kref_init(&isert_conn->kref);
604 mutex_init(&isert_conn->mutex);
605 spin_lock_init(&isert_conn->pool_lock);
606 INIT_LIST_HEAD(&isert_conn->fr_pool);
607 INIT_WORK(&isert_conn->release_work, isert_release_work);
608 }
609
610 static void
611 isert_free_login_buf(struct isert_conn *isert_conn)
612 {
613 struct ib_device *ib_dev = isert_conn->device->ib_device;
614
615 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
616 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
617 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
618 ISCSI_DEF_MAX_RECV_SEG_LEN,
619 DMA_FROM_DEVICE);
620 kfree(isert_conn->login_buf);
621 }
622
623 static int
624 isert_alloc_login_buf(struct isert_conn *isert_conn,
625 struct ib_device *ib_dev)
626 {
627 int ret;
628
629 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
630 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
631 if (!isert_conn->login_buf) {
632 isert_err("Unable to allocate isert_conn->login_buf\n");
633 return -ENOMEM;
634 }
635
636 isert_conn->login_req_buf = isert_conn->login_buf;
637 isert_conn->login_rsp_buf = isert_conn->login_buf +
638 ISCSI_DEF_MAX_RECV_SEG_LEN;
639
640 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
641 isert_conn->login_buf, isert_conn->login_req_buf,
642 isert_conn->login_rsp_buf);
643
644 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
645 (void *)isert_conn->login_req_buf,
646 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
647
648 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
649 if (ret) {
650 isert_err("login_req_dma mapping error: %d\n", ret);
651 isert_conn->login_req_dma = 0;
652 goto out_login_buf;
653 }
654
655 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
656 (void *)isert_conn->login_rsp_buf,
657 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
658
659 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
660 if (ret) {
661 isert_err("login_rsp_dma mapping error: %d\n", ret);
662 isert_conn->login_rsp_dma = 0;
663 goto out_req_dma_map;
664 }
665
666 return 0;
667
668 out_req_dma_map:
669 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
670 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
671 out_login_buf:
672 kfree(isert_conn->login_buf);
673 return ret;
674 }
675
676 static int
677 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
678 {
679 struct isert_np *isert_np = cma_id->context;
680 struct iscsi_np *np = isert_np->np;
681 struct isert_conn *isert_conn;
682 struct isert_device *device;
683 int ret = 0;
684
685 spin_lock_bh(&np->np_thread_lock);
686 if (!np->enabled) {
687 spin_unlock_bh(&np->np_thread_lock);
688 isert_dbg("iscsi_np is not enabled, reject connect request\n");
689 return rdma_reject(cma_id, NULL, 0);
690 }
691 spin_unlock_bh(&np->np_thread_lock);
692
693 isert_dbg("cma_id: %p, portal: %p\n",
694 cma_id, cma_id->context);
695
696 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
697 if (!isert_conn)
698 return -ENOMEM;
699
700 isert_init_conn(isert_conn);
701 isert_conn->cm_id = cma_id;
702
703 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
704 if (ret)
705 goto out;
706
707 device = isert_device_get(cma_id);
708 if (IS_ERR(device)) {
709 ret = PTR_ERR(device);
710 goto out_rsp_dma_map;
711 }
712 isert_conn->device = device;
713
714 /* Set max inflight RDMA READ requests */
715 isert_conn->initiator_depth = min_t(u8,
716 event->param.conn.initiator_depth,
717 device->dev_attr.max_qp_init_rd_atom);
718 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
719
720 ret = isert_conn_setup_qp(isert_conn, cma_id);
721 if (ret)
722 goto out_conn_dev;
723
724 ret = isert_rdma_post_recvl(isert_conn);
725 if (ret)
726 goto out_conn_dev;
727
728 ret = isert_rdma_accept(isert_conn);
729 if (ret)
730 goto out_conn_dev;
731
732 mutex_lock(&isert_np->mutex);
733 list_add_tail(&isert_conn->node, &isert_np->accepted);
734 mutex_unlock(&isert_np->mutex);
735
736 return 0;
737
738 out_conn_dev:
739 isert_device_put(device);
740 out_rsp_dma_map:
741 isert_free_login_buf(isert_conn);
742 out:
743 kfree(isert_conn);
744 rdma_reject(cma_id, NULL, 0);
745 return ret;
746 }
747
748 static void
749 isert_connect_release(struct isert_conn *isert_conn)
750 {
751 struct isert_device *device = isert_conn->device;
752
753 isert_dbg("conn %p\n", isert_conn);
754
755 BUG_ON(!device);
756
757 if (device->use_fastreg)
758 isert_conn_free_fastreg_pool(isert_conn);
759
760 isert_free_rx_descriptors(isert_conn);
761 if (isert_conn->cm_id)
762 rdma_destroy_id(isert_conn->cm_id);
763
764 if (isert_conn->qp) {
765 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
766
767 isert_comp_put(comp);
768 ib_destroy_qp(isert_conn->qp);
769 }
770
771 if (isert_conn->login_buf)
772 isert_free_login_buf(isert_conn);
773
774 isert_device_put(device);
775
776 kfree(isert_conn);
777 }
778
779 static void
780 isert_connected_handler(struct rdma_cm_id *cma_id)
781 {
782 struct isert_conn *isert_conn = cma_id->qp->qp_context;
783 struct isert_np *isert_np = cma_id->context;
784
785 isert_info("conn %p\n", isert_conn);
786
787 mutex_lock(&isert_conn->mutex);
788 isert_conn->state = ISER_CONN_UP;
789 kref_get(&isert_conn->kref);
790 mutex_unlock(&isert_conn->mutex);
791
792 mutex_lock(&isert_np->mutex);
793 list_move_tail(&isert_conn->node, &isert_np->pending);
794 mutex_unlock(&isert_np->mutex);
795
796 isert_info("np %p: Allow accept_np to continue\n", isert_np);
797 up(&isert_np->sem);
798 }
799
800 static void
801 isert_release_kref(struct kref *kref)
802 {
803 struct isert_conn *isert_conn = container_of(kref,
804 struct isert_conn, kref);
805
806 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
807 current->pid);
808
809 isert_connect_release(isert_conn);
810 }
811
812 static void
813 isert_put_conn(struct isert_conn *isert_conn)
814 {
815 kref_put(&isert_conn->kref, isert_release_kref);
816 }
817
818 /**
819 * isert_conn_terminate() - Initiate connection termination
820 * @isert_conn: isert connection struct
821 *
822 * Notes:
823 * In case the connection state is FULL_FEATURE, move state
824 * to TEMINATING and start teardown sequence (rdma_disconnect).
825 * In case the connection state is UP, complete flush as well.
826 *
827 * This routine must be called with mutex held. Thus it is
828 * safe to call multiple times.
829 */
830 static void
831 isert_conn_terminate(struct isert_conn *isert_conn)
832 {
833 int err;
834
835 switch (isert_conn->state) {
836 case ISER_CONN_TERMINATING:
837 break;
838 case ISER_CONN_UP:
839 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
840 isert_info("Terminating conn %p state %d\n",
841 isert_conn, isert_conn->state);
842 isert_conn->state = ISER_CONN_TERMINATING;
843 err = rdma_disconnect(isert_conn->cm_id);
844 if (err)
845 isert_warn("Failed rdma_disconnect isert_conn %p\n",
846 isert_conn);
847 break;
848 default:
849 isert_warn("conn %p teminating in state %d\n",
850 isert_conn, isert_conn->state);
851 }
852 }
853
854 static int
855 isert_np_cma_handler(struct isert_np *isert_np,
856 enum rdma_cm_event_type event)
857 {
858 isert_dbg("%s (%d): isert np %p\n",
859 rdma_event_msg(event), event, isert_np);
860
861 switch (event) {
862 case RDMA_CM_EVENT_DEVICE_REMOVAL:
863 isert_np->cm_id = NULL;
864 break;
865 case RDMA_CM_EVENT_ADDR_CHANGE:
866 isert_np->cm_id = isert_setup_id(isert_np);
867 if (IS_ERR(isert_np->cm_id)) {
868 isert_err("isert np %p setup id failed: %ld\n",
869 isert_np, PTR_ERR(isert_np->cm_id));
870 isert_np->cm_id = NULL;
871 }
872 break;
873 default:
874 isert_err("isert np %p Unexpected event %d\n",
875 isert_np, event);
876 }
877
878 return -1;
879 }
880
881 static int
882 isert_disconnected_handler(struct rdma_cm_id *cma_id,
883 enum rdma_cm_event_type event)
884 {
885 struct isert_np *isert_np = cma_id->context;
886 struct isert_conn *isert_conn;
887 bool terminating = false;
888
889 if (isert_np->cm_id == cma_id)
890 return isert_np_cma_handler(cma_id->context, event);
891
892 isert_conn = cma_id->qp->qp_context;
893
894 mutex_lock(&isert_conn->mutex);
895 terminating = (isert_conn->state == ISER_CONN_TERMINATING);
896 isert_conn_terminate(isert_conn);
897 mutex_unlock(&isert_conn->mutex);
898
899 isert_info("conn %p completing wait\n", isert_conn);
900 complete(&isert_conn->wait);
901
902 if (terminating)
903 goto out;
904
905 mutex_lock(&isert_np->mutex);
906 if (!list_empty(&isert_conn->node)) {
907 list_del_init(&isert_conn->node);
908 isert_put_conn(isert_conn);
909 queue_work(isert_release_wq, &isert_conn->release_work);
910 }
911 mutex_unlock(&isert_np->mutex);
912
913 out:
914 return 0;
915 }
916
917 static int
918 isert_connect_error(struct rdma_cm_id *cma_id)
919 {
920 struct isert_conn *isert_conn = cma_id->qp->qp_context;
921
922 list_del_init(&isert_conn->node);
923 isert_conn->cm_id = NULL;
924 isert_put_conn(isert_conn);
925
926 return -1;
927 }
928
929 static int
930 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
931 {
932 int ret = 0;
933
934 isert_info("%s (%d): status %d id %p np %p\n",
935 rdma_event_msg(event->event), event->event,
936 event->status, cma_id, cma_id->context);
937
938 switch (event->event) {
939 case RDMA_CM_EVENT_CONNECT_REQUEST:
940 ret = isert_connect_request(cma_id, event);
941 if (ret)
942 isert_err("failed handle connect request %d\n", ret);
943 break;
944 case RDMA_CM_EVENT_ESTABLISHED:
945 isert_connected_handler(cma_id);
946 break;
947 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
948 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
949 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
950 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
951 ret = isert_disconnected_handler(cma_id, event->event);
952 break;
953 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
954 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
955 case RDMA_CM_EVENT_CONNECT_ERROR:
956 ret = isert_connect_error(cma_id);
957 break;
958 default:
959 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
960 break;
961 }
962
963 return ret;
964 }
965
966 static int
967 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
968 {
969 struct ib_recv_wr *rx_wr, *rx_wr_failed;
970 int i, ret;
971 struct iser_rx_desc *rx_desc;
972
973 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
974 rx_desc = &isert_conn->rx_descs[i];
975 rx_wr->wr_id = (uintptr_t)rx_desc;
976 rx_wr->sg_list = &rx_desc->rx_sg;
977 rx_wr->num_sge = 1;
978 rx_wr->next = rx_wr + 1;
979 }
980 rx_wr--;
981 rx_wr->next = NULL; /* mark end of work requests list */
982
983 isert_conn->post_recv_buf_count += count;
984 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
985 &rx_wr_failed);
986 if (ret) {
987 isert_err("ib_post_recv() failed with ret: %d\n", ret);
988 isert_conn->post_recv_buf_count -= count;
989 }
990
991 return ret;
992 }
993
994 static int
995 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
996 {
997 struct ib_recv_wr *rx_wr_failed, rx_wr;
998 int ret;
999
1000 rx_wr.wr_id = (uintptr_t)rx_desc;
1001 rx_wr.sg_list = &rx_desc->rx_sg;
1002 rx_wr.num_sge = 1;
1003 rx_wr.next = NULL;
1004
1005 isert_conn->post_recv_buf_count++;
1006 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
1007 if (ret) {
1008 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1009 isert_conn->post_recv_buf_count--;
1010 }
1011
1012 return ret;
1013 }
1014
1015 static int
1016 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1017 {
1018 struct ib_device *ib_dev = isert_conn->cm_id->device;
1019 struct ib_send_wr send_wr, *send_wr_failed;
1020 int ret;
1021
1022 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1023 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1024
1025 send_wr.next = NULL;
1026 send_wr.wr_id = (uintptr_t)tx_desc;
1027 send_wr.sg_list = tx_desc->tx_sg;
1028 send_wr.num_sge = tx_desc->num_sge;
1029 send_wr.opcode = IB_WR_SEND;
1030 send_wr.send_flags = IB_SEND_SIGNALED;
1031
1032 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1033 if (ret)
1034 isert_err("ib_post_send() failed, ret: %d\n", ret);
1035
1036 return ret;
1037 }
1038
1039 static void
1040 isert_create_send_desc(struct isert_conn *isert_conn,
1041 struct isert_cmd *isert_cmd,
1042 struct iser_tx_desc *tx_desc)
1043 {
1044 struct isert_device *device = isert_conn->device;
1045 struct ib_device *ib_dev = device->ib_device;
1046
1047 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1048 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1049
1050 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1051 tx_desc->iser_header.flags = ISER_VER;
1052
1053 tx_desc->num_sge = 1;
1054 tx_desc->isert_cmd = isert_cmd;
1055
1056 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1057 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1058 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1059 }
1060 }
1061
1062 static int
1063 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1064 struct iser_tx_desc *tx_desc)
1065 {
1066 struct isert_device *device = isert_conn->device;
1067 struct ib_device *ib_dev = device->ib_device;
1068 u64 dma_addr;
1069
1070 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1071 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1072 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1073 isert_err("ib_dma_mapping_error() failed\n");
1074 return -ENOMEM;
1075 }
1076
1077 tx_desc->dma_addr = dma_addr;
1078 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1079 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1080 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1081
1082 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1083 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1084 tx_desc->tx_sg[0].lkey);
1085
1086 return 0;
1087 }
1088
1089 static void
1090 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1091 struct ib_send_wr *send_wr)
1092 {
1093 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1094
1095 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1096 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1097 send_wr->opcode = IB_WR_SEND;
1098 send_wr->sg_list = &tx_desc->tx_sg[0];
1099 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1100 send_wr->send_flags = IB_SEND_SIGNALED;
1101 }
1102
1103 static int
1104 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1105 {
1106 struct ib_recv_wr rx_wr, *rx_wr_fail;
1107 struct ib_sge sge;
1108 int ret;
1109
1110 memset(&sge, 0, sizeof(struct ib_sge));
1111 sge.addr = isert_conn->login_req_dma;
1112 sge.length = ISER_RX_LOGIN_SIZE;
1113 sge.lkey = isert_conn->device->pd->local_dma_lkey;
1114
1115 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1116 sge.addr, sge.length, sge.lkey);
1117
1118 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1119 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1120 rx_wr.sg_list = &sge;
1121 rx_wr.num_sge = 1;
1122
1123 isert_conn->post_recv_buf_count++;
1124 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1125 if (ret) {
1126 isert_err("ib_post_recv() failed: %d\n", ret);
1127 isert_conn->post_recv_buf_count--;
1128 }
1129
1130 return ret;
1131 }
1132
1133 static int
1134 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1135 u32 length)
1136 {
1137 struct isert_conn *isert_conn = conn->context;
1138 struct isert_device *device = isert_conn->device;
1139 struct ib_device *ib_dev = device->ib_device;
1140 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1141 int ret;
1142
1143 isert_create_send_desc(isert_conn, NULL, tx_desc);
1144
1145 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1146 sizeof(struct iscsi_hdr));
1147
1148 isert_init_tx_hdrs(isert_conn, tx_desc);
1149
1150 if (length > 0) {
1151 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1152
1153 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1154 length, DMA_TO_DEVICE);
1155
1156 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1157
1158 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1159 length, DMA_TO_DEVICE);
1160
1161 tx_dsg->addr = isert_conn->login_rsp_dma;
1162 tx_dsg->length = length;
1163 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1164 tx_desc->num_sge = 2;
1165 }
1166 if (!login->login_failed) {
1167 if (login->login_complete) {
1168 if (!conn->sess->sess_ops->SessionType &&
1169 isert_conn->device->use_fastreg) {
1170 ret = isert_conn_create_fastreg_pool(isert_conn);
1171 if (ret) {
1172 isert_err("Conn: %p failed to create"
1173 " fastreg pool\n", isert_conn);
1174 return ret;
1175 }
1176 }
1177
1178 ret = isert_alloc_rx_descriptors(isert_conn);
1179 if (ret)
1180 return ret;
1181
1182 ret = isert_post_recvm(isert_conn,
1183 ISERT_QP_MAX_RECV_DTOS);
1184 if (ret)
1185 return ret;
1186
1187 /* Now we are in FULL_FEATURE phase */
1188 mutex_lock(&isert_conn->mutex);
1189 isert_conn->state = ISER_CONN_FULL_FEATURE;
1190 mutex_unlock(&isert_conn->mutex);
1191 goto post_send;
1192 }
1193
1194 ret = isert_rdma_post_recvl(isert_conn);
1195 if (ret)
1196 return ret;
1197 }
1198 post_send:
1199 ret = isert_post_send(isert_conn, tx_desc);
1200 if (ret)
1201 return ret;
1202
1203 return 0;
1204 }
1205
1206 static void
1207 isert_rx_login_req(struct isert_conn *isert_conn)
1208 {
1209 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1210 int rx_buflen = isert_conn->login_req_len;
1211 struct iscsi_conn *conn = isert_conn->conn;
1212 struct iscsi_login *login = conn->conn_login;
1213 int size;
1214
1215 isert_info("conn %p\n", isert_conn);
1216
1217 WARN_ON_ONCE(!login);
1218
1219 if (login->first_request) {
1220 struct iscsi_login_req *login_req =
1221 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1222 /*
1223 * Setup the initial iscsi_login values from the leading
1224 * login request PDU.
1225 */
1226 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1227 login->current_stage =
1228 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1229 >> 2;
1230 login->version_min = login_req->min_version;
1231 login->version_max = login_req->max_version;
1232 memcpy(login->isid, login_req->isid, 6);
1233 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1234 login->init_task_tag = login_req->itt;
1235 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1236 login->cid = be16_to_cpu(login_req->cid);
1237 login->tsih = be16_to_cpu(login_req->tsih);
1238 }
1239
1240 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1241
1242 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1243 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1244 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1245 MAX_KEY_VALUE_PAIRS);
1246 memcpy(login->req_buf, &rx_desc->data[0], size);
1247
1248 if (login->first_request) {
1249 complete(&isert_conn->login_comp);
1250 return;
1251 }
1252 schedule_delayed_work(&conn->login_work, 0);
1253 }
1254
1255 static struct iscsi_cmd
1256 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1257 {
1258 struct isert_conn *isert_conn = conn->context;
1259 struct isert_cmd *isert_cmd;
1260 struct iscsi_cmd *cmd;
1261
1262 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1263 if (!cmd) {
1264 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1265 return NULL;
1266 }
1267 isert_cmd = iscsit_priv_cmd(cmd);
1268 isert_cmd->conn = isert_conn;
1269 isert_cmd->iscsi_cmd = cmd;
1270 isert_cmd->rx_desc = rx_desc;
1271
1272 return cmd;
1273 }
1274
1275 static int
1276 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1277 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1278 struct iser_rx_desc *rx_desc, unsigned char *buf)
1279 {
1280 struct iscsi_conn *conn = isert_conn->conn;
1281 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1282 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1283 bool dump_payload = false;
1284 unsigned int data_len;
1285
1286 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1287 if (rc < 0)
1288 return rc;
1289
1290 imm_data = cmd->immediate_data;
1291 imm_data_len = cmd->first_burst_len;
1292 unsol_data = cmd->unsolicited_data;
1293 data_len = cmd->se_cmd.data_length;
1294
1295 if (imm_data && imm_data_len == data_len)
1296 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1297 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1298 if (rc < 0) {
1299 return 0;
1300 } else if (rc > 0) {
1301 dump_payload = true;
1302 goto sequence_cmd;
1303 }
1304
1305 if (!imm_data)
1306 return 0;
1307
1308 if (imm_data_len != data_len) {
1309 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1310 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1311 &rx_desc->data[0], imm_data_len);
1312 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1313 sg_nents, imm_data_len);
1314 } else {
1315 sg_init_table(&isert_cmd->sg, 1);
1316 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1317 cmd->se_cmd.t_data_nents = 1;
1318 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1319 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1320 imm_data_len);
1321 }
1322
1323 cmd->write_data_done += imm_data_len;
1324
1325 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1326 spin_lock_bh(&cmd->istate_lock);
1327 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1328 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1329 spin_unlock_bh(&cmd->istate_lock);
1330 }
1331
1332 sequence_cmd:
1333 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1334
1335 if (!rc && dump_payload == false && unsol_data)
1336 iscsit_set_unsoliticed_dataout(cmd);
1337 else if (dump_payload && imm_data)
1338 target_put_sess_cmd(&cmd->se_cmd);
1339
1340 return 0;
1341 }
1342
1343 static int
1344 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1345 struct iser_rx_desc *rx_desc, unsigned char *buf)
1346 {
1347 struct scatterlist *sg_start;
1348 struct iscsi_conn *conn = isert_conn->conn;
1349 struct iscsi_cmd *cmd = NULL;
1350 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1351 u32 unsol_data_len = ntoh24(hdr->dlength);
1352 int rc, sg_nents, sg_off, page_off;
1353
1354 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1355 if (rc < 0)
1356 return rc;
1357 else if (!cmd)
1358 return 0;
1359 /*
1360 * FIXME: Unexpected unsolicited_data out
1361 */
1362 if (!cmd->unsolicited_data) {
1363 isert_err("Received unexpected solicited data payload\n");
1364 dump_stack();
1365 return -1;
1366 }
1367
1368 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1369 "write_data_done: %u, data_length: %u\n",
1370 unsol_data_len, cmd->write_data_done,
1371 cmd->se_cmd.data_length);
1372
1373 sg_off = cmd->write_data_done / PAGE_SIZE;
1374 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1375 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1376 page_off = cmd->write_data_done % PAGE_SIZE;
1377 /*
1378 * FIXME: Non page-aligned unsolicited_data out
1379 */
1380 if (page_off) {
1381 isert_err("unexpected non-page aligned data payload\n");
1382 dump_stack();
1383 return -1;
1384 }
1385 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1386 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1387 sg_nents, &rx_desc->data[0], unsol_data_len);
1388
1389 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1390 unsol_data_len);
1391
1392 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1393 if (rc < 0)
1394 return rc;
1395
1396 /*
1397 * multiple data-outs on the same command can arrive -
1398 * so post the buffer before hand
1399 */
1400 rc = isert_post_recv(isert_conn, rx_desc);
1401 if (rc) {
1402 isert_err("ib_post_recv failed with %d\n", rc);
1403 return rc;
1404 }
1405 return 0;
1406 }
1407
1408 static int
1409 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1410 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1411 unsigned char *buf)
1412 {
1413 struct iscsi_conn *conn = isert_conn->conn;
1414 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1415 int rc;
1416
1417 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1418 if (rc < 0)
1419 return rc;
1420 /*
1421 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1422 */
1423
1424 return iscsit_process_nop_out(conn, cmd, hdr);
1425 }
1426
1427 static int
1428 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1429 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1430 struct iscsi_text *hdr)
1431 {
1432 struct iscsi_conn *conn = isert_conn->conn;
1433 u32 payload_length = ntoh24(hdr->dlength);
1434 int rc;
1435 unsigned char *text_in = NULL;
1436
1437 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1438 if (rc < 0)
1439 return rc;
1440
1441 if (payload_length) {
1442 text_in = kzalloc(payload_length, GFP_KERNEL);
1443 if (!text_in) {
1444 isert_err("Unable to allocate text_in of payload_length: %u\n",
1445 payload_length);
1446 return -ENOMEM;
1447 }
1448 }
1449 cmd->text_in_ptr = text_in;
1450
1451 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1452
1453 return iscsit_process_text_cmd(conn, cmd, hdr);
1454 }
1455
1456 static int
1457 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1458 uint32_t read_stag, uint64_t read_va,
1459 uint32_t write_stag, uint64_t write_va)
1460 {
1461 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1462 struct iscsi_conn *conn = isert_conn->conn;
1463 struct iscsi_cmd *cmd;
1464 struct isert_cmd *isert_cmd;
1465 int ret = -EINVAL;
1466 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1467
1468 if (conn->sess->sess_ops->SessionType &&
1469 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1470 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1471 " ignoring\n", opcode);
1472 return 0;
1473 }
1474
1475 switch (opcode) {
1476 case ISCSI_OP_SCSI_CMD:
1477 cmd = isert_allocate_cmd(conn, rx_desc);
1478 if (!cmd)
1479 break;
1480
1481 isert_cmd = iscsit_priv_cmd(cmd);
1482 isert_cmd->read_stag = read_stag;
1483 isert_cmd->read_va = read_va;
1484 isert_cmd->write_stag = write_stag;
1485 isert_cmd->write_va = write_va;
1486
1487 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1488 rx_desc, (unsigned char *)hdr);
1489 break;
1490 case ISCSI_OP_NOOP_OUT:
1491 cmd = isert_allocate_cmd(conn, rx_desc);
1492 if (!cmd)
1493 break;
1494
1495 isert_cmd = iscsit_priv_cmd(cmd);
1496 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1497 rx_desc, (unsigned char *)hdr);
1498 break;
1499 case ISCSI_OP_SCSI_DATA_OUT:
1500 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1501 (unsigned char *)hdr);
1502 break;
1503 case ISCSI_OP_SCSI_TMFUNC:
1504 cmd = isert_allocate_cmd(conn, rx_desc);
1505 if (!cmd)
1506 break;
1507
1508 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1509 (unsigned char *)hdr);
1510 break;
1511 case ISCSI_OP_LOGOUT:
1512 cmd = isert_allocate_cmd(conn, rx_desc);
1513 if (!cmd)
1514 break;
1515
1516 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1517 break;
1518 case ISCSI_OP_TEXT:
1519 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1520 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1521 else
1522 cmd = isert_allocate_cmd(conn, rx_desc);
1523
1524 if (!cmd)
1525 break;
1526
1527 isert_cmd = iscsit_priv_cmd(cmd);
1528 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1529 rx_desc, (struct iscsi_text *)hdr);
1530 break;
1531 default:
1532 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1533 dump_stack();
1534 break;
1535 }
1536
1537 return ret;
1538 }
1539
1540 static void
1541 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1542 {
1543 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1544 uint64_t read_va = 0, write_va = 0;
1545 uint32_t read_stag = 0, write_stag = 0;
1546
1547 switch (iser_hdr->flags & 0xF0) {
1548 case ISCSI_CTRL:
1549 if (iser_hdr->flags & ISER_RSV) {
1550 read_stag = be32_to_cpu(iser_hdr->read_stag);
1551 read_va = be64_to_cpu(iser_hdr->read_va);
1552 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1553 read_stag, (unsigned long long)read_va);
1554 }
1555 if (iser_hdr->flags & ISER_WSV) {
1556 write_stag = be32_to_cpu(iser_hdr->write_stag);
1557 write_va = be64_to_cpu(iser_hdr->write_va);
1558 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1559 write_stag, (unsigned long long)write_va);
1560 }
1561
1562 isert_dbg("ISER ISCSI_CTRL PDU\n");
1563 break;
1564 case ISER_HELLO:
1565 isert_err("iSER Hello message\n");
1566 break;
1567 default:
1568 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1569 break;
1570 }
1571
1572 isert_rx_opcode(isert_conn, rx_desc,
1573 read_stag, read_va, write_stag, write_va);
1574 }
1575
1576 static void
1577 isert_rcv_completion(struct iser_rx_desc *desc,
1578 struct isert_conn *isert_conn,
1579 u32 xfer_len)
1580 {
1581 struct ib_device *ib_dev = isert_conn->cm_id->device;
1582 struct iscsi_hdr *hdr;
1583 u64 rx_dma;
1584 int rx_buflen;
1585
1586 if ((char *)desc == isert_conn->login_req_buf) {
1587 rx_dma = isert_conn->login_req_dma;
1588 rx_buflen = ISER_RX_LOGIN_SIZE;
1589 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1590 rx_dma, rx_buflen);
1591 } else {
1592 rx_dma = desc->dma_addr;
1593 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1594 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1595 rx_dma, rx_buflen);
1596 }
1597
1598 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1599
1600 hdr = &desc->iscsi_header;
1601 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1602 hdr->opcode, hdr->itt, hdr->flags,
1603 (int)(xfer_len - ISER_HEADERS_LEN));
1604
1605 if ((char *)desc == isert_conn->login_req_buf) {
1606 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1607 if (isert_conn->conn) {
1608 struct iscsi_login *login = isert_conn->conn->conn_login;
1609
1610 if (login && !login->first_request)
1611 isert_rx_login_req(isert_conn);
1612 }
1613 mutex_lock(&isert_conn->mutex);
1614 complete(&isert_conn->login_req_comp);
1615 mutex_unlock(&isert_conn->mutex);
1616 } else {
1617 isert_rx_do_work(desc, isert_conn);
1618 }
1619
1620 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1621 DMA_FROM_DEVICE);
1622
1623 isert_conn->post_recv_buf_count--;
1624 }
1625
1626 static int
1627 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1628 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1629 enum iser_ib_op_code op, struct isert_data_buf *data)
1630 {
1631 struct ib_device *ib_dev = isert_conn->cm_id->device;
1632
1633 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1634 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1635
1636 data->len = length - offset;
1637 data->offset = offset;
1638 data->sg_off = data->offset / PAGE_SIZE;
1639
1640 data->sg = &sg[data->sg_off];
1641 data->nents = min_t(unsigned int, nents - data->sg_off,
1642 ISCSI_ISER_SG_TABLESIZE);
1643 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1644 PAGE_SIZE);
1645
1646 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1647 data->dma_dir);
1648 if (unlikely(!data->dma_nents)) {
1649 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1650 return -EINVAL;
1651 }
1652
1653 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1654 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1655
1656 return 0;
1657 }
1658
1659 static void
1660 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1661 {
1662 struct ib_device *ib_dev = isert_conn->cm_id->device;
1663
1664 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1665 memset(data, 0, sizeof(*data));
1666 }
1667
1668
1669
1670 static void
1671 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1672 {
1673 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1674
1675 isert_dbg("Cmd %p\n", isert_cmd);
1676
1677 if (wr->data.sg) {
1678 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1679 isert_unmap_data_buf(isert_conn, &wr->data);
1680 }
1681
1682 if (wr->rdma_wr) {
1683 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1684 kfree(wr->rdma_wr);
1685 wr->rdma_wr = NULL;
1686 }
1687
1688 if (wr->ib_sge) {
1689 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1690 kfree(wr->ib_sge);
1691 wr->ib_sge = NULL;
1692 }
1693 }
1694
1695 static void
1696 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1697 {
1698 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1699
1700 isert_dbg("Cmd %p\n", isert_cmd);
1701
1702 if (wr->fr_desc) {
1703 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1704 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1705 isert_unmap_data_buf(isert_conn, &wr->prot);
1706 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1707 }
1708 spin_lock_bh(&isert_conn->pool_lock);
1709 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1710 spin_unlock_bh(&isert_conn->pool_lock);
1711 wr->fr_desc = NULL;
1712 }
1713
1714 if (wr->data.sg) {
1715 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1716 isert_unmap_data_buf(isert_conn, &wr->data);
1717 }
1718
1719 wr->ib_sge = NULL;
1720 wr->rdma_wr = NULL;
1721 }
1722
1723 static void
1724 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1725 {
1726 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1727 struct isert_conn *isert_conn = isert_cmd->conn;
1728 struct iscsi_conn *conn = isert_conn->conn;
1729 struct isert_device *device = isert_conn->device;
1730 struct iscsi_text_rsp *hdr;
1731
1732 isert_dbg("Cmd %p\n", isert_cmd);
1733
1734 switch (cmd->iscsi_opcode) {
1735 case ISCSI_OP_SCSI_CMD:
1736 spin_lock_bh(&conn->cmd_lock);
1737 if (!list_empty(&cmd->i_conn_node))
1738 list_del_init(&cmd->i_conn_node);
1739 spin_unlock_bh(&conn->cmd_lock);
1740
1741 if (cmd->data_direction == DMA_TO_DEVICE) {
1742 iscsit_stop_dataout_timer(cmd);
1743 /*
1744 * Check for special case during comp_err where
1745 * WRITE_PENDING has been handed off from core,
1746 * but requires an extra target_put_sess_cmd()
1747 * before transport_generic_free_cmd() below.
1748 */
1749 if (comp_err &&
1750 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1751 struct se_cmd *se_cmd = &cmd->se_cmd;
1752
1753 target_put_sess_cmd(se_cmd);
1754 }
1755 }
1756
1757 device->unreg_rdma_mem(isert_cmd, isert_conn);
1758 transport_generic_free_cmd(&cmd->se_cmd, 0);
1759 break;
1760 case ISCSI_OP_SCSI_TMFUNC:
1761 spin_lock_bh(&conn->cmd_lock);
1762 if (!list_empty(&cmd->i_conn_node))
1763 list_del_init(&cmd->i_conn_node);
1764 spin_unlock_bh(&conn->cmd_lock);
1765
1766 transport_generic_free_cmd(&cmd->se_cmd, 0);
1767 break;
1768 case ISCSI_OP_REJECT:
1769 case ISCSI_OP_NOOP_OUT:
1770 case ISCSI_OP_TEXT:
1771 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1772 /* If the continue bit is on, keep the command alive */
1773 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1774 break;
1775
1776 spin_lock_bh(&conn->cmd_lock);
1777 if (!list_empty(&cmd->i_conn_node))
1778 list_del_init(&cmd->i_conn_node);
1779 spin_unlock_bh(&conn->cmd_lock);
1780
1781 /*
1782 * Handle special case for REJECT when iscsi_add_reject*() has
1783 * overwritten the original iscsi_opcode assignment, and the
1784 * associated cmd->se_cmd needs to be released.
1785 */
1786 if (cmd->se_cmd.se_tfo != NULL) {
1787 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1788 cmd->iscsi_opcode);
1789 transport_generic_free_cmd(&cmd->se_cmd, 0);
1790 break;
1791 }
1792 /*
1793 * Fall-through
1794 */
1795 default:
1796 iscsit_release_cmd(cmd);
1797 break;
1798 }
1799 }
1800
1801 static void
1802 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1803 {
1804 if (tx_desc->dma_addr != 0) {
1805 isert_dbg("unmap single for tx_desc->dma_addr\n");
1806 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1807 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1808 tx_desc->dma_addr = 0;
1809 }
1810 }
1811
1812 static void
1813 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1814 struct ib_device *ib_dev, bool comp_err)
1815 {
1816 if (isert_cmd->pdu_buf_dma != 0) {
1817 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1818 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1819 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1820 isert_cmd->pdu_buf_dma = 0;
1821 }
1822
1823 isert_unmap_tx_desc(tx_desc, ib_dev);
1824 isert_put_cmd(isert_cmd, comp_err);
1825 }
1826
1827 static int
1828 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1829 {
1830 struct ib_mr_status mr_status;
1831 int ret;
1832
1833 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1834 if (ret) {
1835 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1836 goto fail_mr_status;
1837 }
1838
1839 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1840 u64 sec_offset_err;
1841 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1842
1843 switch (mr_status.sig_err.err_type) {
1844 case IB_SIG_BAD_GUARD:
1845 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1846 break;
1847 case IB_SIG_BAD_REFTAG:
1848 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1849 break;
1850 case IB_SIG_BAD_APPTAG:
1851 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1852 break;
1853 }
1854 sec_offset_err = mr_status.sig_err.sig_err_offset;
1855 do_div(sec_offset_err, block_size);
1856 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1857
1858 isert_err("PI error found type %d at sector 0x%llx "
1859 "expected 0x%x vs actual 0x%x\n",
1860 mr_status.sig_err.err_type,
1861 (unsigned long long)se_cmd->bad_sector,
1862 mr_status.sig_err.expected,
1863 mr_status.sig_err.actual);
1864 ret = 1;
1865 }
1866
1867 fail_mr_status:
1868 return ret;
1869 }
1870
1871 static void
1872 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1873 struct isert_cmd *isert_cmd)
1874 {
1875 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1876 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1877 struct se_cmd *se_cmd = &cmd->se_cmd;
1878 struct isert_conn *isert_conn = isert_cmd->conn;
1879 struct isert_device *device = isert_conn->device;
1880 int ret = 0;
1881
1882 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1883 ret = isert_check_pi_status(se_cmd,
1884 wr->fr_desc->pi_ctx->sig_mr);
1885 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1886 }
1887
1888 device->unreg_rdma_mem(isert_cmd, isert_conn);
1889 wr->rdma_wr_num = 0;
1890 if (ret)
1891 transport_send_check_condition_and_sense(se_cmd,
1892 se_cmd->pi_err, 0);
1893 else
1894 isert_put_response(isert_conn->conn, cmd);
1895 }
1896
1897 static void
1898 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1899 struct isert_cmd *isert_cmd)
1900 {
1901 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1902 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1903 struct se_cmd *se_cmd = &cmd->se_cmd;
1904 struct isert_conn *isert_conn = isert_cmd->conn;
1905 struct isert_device *device = isert_conn->device;
1906 int ret = 0;
1907
1908 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1909 ret = isert_check_pi_status(se_cmd,
1910 wr->fr_desc->pi_ctx->sig_mr);
1911 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1912 }
1913
1914 iscsit_stop_dataout_timer(cmd);
1915 device->unreg_rdma_mem(isert_cmd, isert_conn);
1916 cmd->write_data_done = wr->data.len;
1917 wr->rdma_wr_num = 0;
1918
1919 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1920 spin_lock_bh(&cmd->istate_lock);
1921 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1922 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1923 spin_unlock_bh(&cmd->istate_lock);
1924
1925 if (ret) {
1926 target_put_sess_cmd(se_cmd);
1927 transport_send_check_condition_and_sense(se_cmd,
1928 se_cmd->pi_err, 0);
1929 } else {
1930 target_execute_cmd(se_cmd);
1931 }
1932 }
1933
1934 static void
1935 isert_do_control_comp(struct work_struct *work)
1936 {
1937 struct isert_cmd *isert_cmd = container_of(work,
1938 struct isert_cmd, comp_work);
1939 struct isert_conn *isert_conn = isert_cmd->conn;
1940 struct ib_device *ib_dev = isert_conn->cm_id->device;
1941 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1942
1943 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1944
1945 switch (cmd->i_state) {
1946 case ISTATE_SEND_TASKMGTRSP:
1947 iscsit_tmr_post_handler(cmd, cmd->conn);
1948 case ISTATE_SEND_REJECT: /* FALLTHRU */
1949 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1950 cmd->i_state = ISTATE_SENT_STATUS;
1951 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1952 ib_dev, false);
1953 break;
1954 case ISTATE_SEND_LOGOUTRSP:
1955 iscsit_logout_post_handler(cmd, cmd->conn);
1956 break;
1957 default:
1958 isert_err("Unknown i_state %d\n", cmd->i_state);
1959 dump_stack();
1960 break;
1961 }
1962 }
1963
1964 static void
1965 isert_response_completion(struct iser_tx_desc *tx_desc,
1966 struct isert_cmd *isert_cmd,
1967 struct isert_conn *isert_conn,
1968 struct ib_device *ib_dev)
1969 {
1970 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1971
1972 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1973 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1974 cmd->i_state == ISTATE_SEND_REJECT ||
1975 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1976 isert_unmap_tx_desc(tx_desc, ib_dev);
1977
1978 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1979 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1980 return;
1981 }
1982
1983 cmd->i_state = ISTATE_SENT_STATUS;
1984 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1985 }
1986
1987 static void
1988 isert_snd_completion(struct iser_tx_desc *tx_desc,
1989 struct isert_conn *isert_conn)
1990 {
1991 struct ib_device *ib_dev = isert_conn->cm_id->device;
1992 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1993 struct isert_rdma_wr *wr;
1994
1995 if (!isert_cmd) {
1996 isert_unmap_tx_desc(tx_desc, ib_dev);
1997 return;
1998 }
1999 wr = &isert_cmd->rdma_wr;
2000
2001 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2002
2003 switch (wr->iser_ib_op) {
2004 case ISER_IB_SEND:
2005 isert_response_completion(tx_desc, isert_cmd,
2006 isert_conn, ib_dev);
2007 break;
2008 case ISER_IB_RDMA_WRITE:
2009 isert_completion_rdma_write(tx_desc, isert_cmd);
2010 break;
2011 case ISER_IB_RDMA_READ:
2012 isert_completion_rdma_read(tx_desc, isert_cmd);
2013 break;
2014 default:
2015 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2016 dump_stack();
2017 break;
2018 }
2019 }
2020
2021 /**
2022 * is_isert_tx_desc() - Indicate if the completion wr_id
2023 * is a TX descriptor or not.
2024 * @isert_conn: iser connection
2025 * @wr_id: completion WR identifier
2026 *
2027 * Since we cannot rely on wc opcode in FLUSH errors
2028 * we must work around it by checking if the wr_id address
2029 * falls in the iser connection rx_descs buffer. If so
2030 * it is an RX descriptor, otherwize it is a TX.
2031 */
2032 static inline bool
2033 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2034 {
2035 void *start = isert_conn->rx_descs;
2036 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2037
2038 if (wr_id >= start && wr_id < start + len)
2039 return false;
2040
2041 return true;
2042 }
2043
2044 static void
2045 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2046 {
2047 if (wc->wr_id == ISER_BEACON_WRID) {
2048 isert_info("conn %p completing wait_comp_err\n",
2049 isert_conn);
2050 complete(&isert_conn->wait_comp_err);
2051 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2052 struct ib_device *ib_dev = isert_conn->cm_id->device;
2053 struct isert_cmd *isert_cmd;
2054 struct iser_tx_desc *desc;
2055
2056 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2057 isert_cmd = desc->isert_cmd;
2058 if (!isert_cmd)
2059 isert_unmap_tx_desc(desc, ib_dev);
2060 else
2061 isert_completion_put(desc, isert_cmd, ib_dev, true);
2062 } else {
2063 isert_conn->post_recv_buf_count--;
2064 if (!isert_conn->post_recv_buf_count)
2065 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2066 }
2067 }
2068
2069 static void
2070 isert_handle_wc(struct ib_wc *wc)
2071 {
2072 struct isert_conn *isert_conn;
2073 struct iser_tx_desc *tx_desc;
2074 struct iser_rx_desc *rx_desc;
2075
2076 isert_conn = wc->qp->qp_context;
2077 if (likely(wc->status == IB_WC_SUCCESS)) {
2078 if (wc->opcode == IB_WC_RECV) {
2079 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2080 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2081 } else {
2082 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2083 isert_snd_completion(tx_desc, isert_conn);
2084 }
2085 } else {
2086 if (wc->status != IB_WC_WR_FLUSH_ERR)
2087 isert_err("%s (%d): wr id %llx vend_err %x\n",
2088 ib_wc_status_msg(wc->status), wc->status,
2089 wc->wr_id, wc->vendor_err);
2090 else
2091 isert_dbg("%s (%d): wr id %llx\n",
2092 ib_wc_status_msg(wc->status), wc->status,
2093 wc->wr_id);
2094
2095 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2096 isert_cq_comp_err(isert_conn, wc);
2097 }
2098 }
2099
2100 static void
2101 isert_cq_work(struct work_struct *work)
2102 {
2103 enum { isert_poll_budget = 65536 };
2104 struct isert_comp *comp = container_of(work, struct isert_comp,
2105 work);
2106 struct ib_wc *const wcs = comp->wcs;
2107 int i, n, completed = 0;
2108
2109 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2110 for (i = 0; i < n; i++)
2111 isert_handle_wc(&wcs[i]);
2112
2113 completed += n;
2114 if (completed >= isert_poll_budget)
2115 break;
2116 }
2117
2118 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2119 }
2120
2121 static void
2122 isert_cq_callback(struct ib_cq *cq, void *context)
2123 {
2124 struct isert_comp *comp = context;
2125
2126 queue_work(isert_comp_wq, &comp->work);
2127 }
2128
2129 static int
2130 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2131 {
2132 struct ib_send_wr *wr_failed;
2133 int ret;
2134
2135 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2136 if (ret) {
2137 isert_err("ib_post_recv failed with %d\n", ret);
2138 return ret;
2139 }
2140
2141 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2142 &wr_failed);
2143 if (ret) {
2144 isert_err("ib_post_send failed with %d\n", ret);
2145 return ret;
2146 }
2147 return ret;
2148 }
2149
2150 static int
2151 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2152 {
2153 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2154 struct isert_conn *isert_conn = conn->context;
2155 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2156 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2157 &isert_cmd->tx_desc.iscsi_header;
2158
2159 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2160 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2161 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2162 /*
2163 * Attach SENSE DATA payload to iSCSI Response PDU
2164 */
2165 if (cmd->se_cmd.sense_buffer &&
2166 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2167 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2168 struct isert_device *device = isert_conn->device;
2169 struct ib_device *ib_dev = device->ib_device;
2170 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2171 u32 padding, pdu_len;
2172
2173 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2174 cmd->sense_buffer);
2175 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2176
2177 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2178 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2179 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2180
2181 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2182 (void *)cmd->sense_buffer, pdu_len,
2183 DMA_TO_DEVICE);
2184
2185 isert_cmd->pdu_buf_len = pdu_len;
2186 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2187 tx_dsg->length = pdu_len;
2188 tx_dsg->lkey = device->pd->local_dma_lkey;
2189 isert_cmd->tx_desc.num_sge = 2;
2190 }
2191
2192 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2193
2194 isert_dbg("Posting SCSI Response\n");
2195
2196 return isert_post_response(isert_conn, isert_cmd);
2197 }
2198
2199 static void
2200 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2201 {
2202 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2203 struct isert_conn *isert_conn = conn->context;
2204 struct isert_device *device = isert_conn->device;
2205
2206 spin_lock_bh(&conn->cmd_lock);
2207 if (!list_empty(&cmd->i_conn_node))
2208 list_del_init(&cmd->i_conn_node);
2209 spin_unlock_bh(&conn->cmd_lock);
2210
2211 if (cmd->data_direction == DMA_TO_DEVICE)
2212 iscsit_stop_dataout_timer(cmd);
2213
2214 device->unreg_rdma_mem(isert_cmd, isert_conn);
2215 }
2216
2217 static enum target_prot_op
2218 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2219 {
2220 struct isert_conn *isert_conn = conn->context;
2221 struct isert_device *device = isert_conn->device;
2222
2223 if (conn->tpg->tpg_attrib.t10_pi) {
2224 if (device->pi_capable) {
2225 isert_info("conn %p PI offload enabled\n", isert_conn);
2226 isert_conn->pi_support = true;
2227 return TARGET_PROT_ALL;
2228 }
2229 }
2230
2231 isert_info("conn %p PI offload disabled\n", isert_conn);
2232 isert_conn->pi_support = false;
2233
2234 return TARGET_PROT_NORMAL;
2235 }
2236
2237 static int
2238 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2239 bool nopout_response)
2240 {
2241 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2242 struct isert_conn *isert_conn = conn->context;
2243 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2244
2245 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2246 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2247 &isert_cmd->tx_desc.iscsi_header,
2248 nopout_response);
2249 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2250 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2251
2252 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2253
2254 return isert_post_response(isert_conn, isert_cmd);
2255 }
2256
2257 static int
2258 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2259 {
2260 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2261 struct isert_conn *isert_conn = conn->context;
2262 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2263
2264 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2265 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2266 &isert_cmd->tx_desc.iscsi_header);
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 Logout Response\n", isert_conn);
2271
2272 return isert_post_response(isert_conn, isert_cmd);
2273 }
2274
2275 static int
2276 isert_put_tm_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_task_mgt_rsp(cmd, conn, (struct iscsi_tm_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 Task Management Response\n", isert_conn);
2289
2290 return isert_post_response(isert_conn, isert_cmd);
2291 }
2292
2293 static int
2294 isert_put_reject(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 struct isert_device *device = isert_conn->device;
2300 struct ib_device *ib_dev = device->ib_device;
2301 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2302 struct iscsi_reject *hdr =
2303 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2304
2305 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2306 iscsit_build_reject(cmd, conn, hdr);
2307 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2308
2309 hton24(hdr->dlength, ISCSI_HDR_LEN);
2310 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2311 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2312 DMA_TO_DEVICE);
2313 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2314 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2315 tx_dsg->length = ISCSI_HDR_LEN;
2316 tx_dsg->lkey = device->pd->local_dma_lkey;
2317 isert_cmd->tx_desc.num_sge = 2;
2318
2319 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2320
2321 isert_dbg("conn %p Posting Reject\n", isert_conn);
2322
2323 return isert_post_response(isert_conn, isert_cmd);
2324 }
2325
2326 static int
2327 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2328 {
2329 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2330 struct isert_conn *isert_conn = conn->context;
2331 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2332 struct iscsi_text_rsp *hdr =
2333 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2334 u32 txt_rsp_len;
2335 int rc;
2336
2337 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2338 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2339 if (rc < 0)
2340 return rc;
2341
2342 txt_rsp_len = rc;
2343 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2344
2345 if (txt_rsp_len) {
2346 struct isert_device *device = isert_conn->device;
2347 struct ib_device *ib_dev = device->ib_device;
2348 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2349 void *txt_rsp_buf = cmd->buf_ptr;
2350
2351 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2352 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2353
2354 isert_cmd->pdu_buf_len = txt_rsp_len;
2355 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2356 tx_dsg->length = txt_rsp_len;
2357 tx_dsg->lkey = device->pd->local_dma_lkey;
2358 isert_cmd->tx_desc.num_sge = 2;
2359 }
2360 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2361
2362 isert_dbg("conn %p Text Response\n", isert_conn);
2363
2364 return isert_post_response(isert_conn, isert_cmd);
2365 }
2366
2367 static int
2368 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2369 struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr,
2370 u32 data_left, u32 offset)
2371 {
2372 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2373 struct scatterlist *sg_start, *tmp_sg;
2374 struct isert_device *device = isert_conn->device;
2375 struct ib_device *ib_dev = device->ib_device;
2376 u32 sg_off, page_off;
2377 int i = 0, sg_nents;
2378
2379 sg_off = offset / PAGE_SIZE;
2380 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2381 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2382 page_off = offset % PAGE_SIZE;
2383
2384 rdma_wr->wr.sg_list = ib_sge;
2385 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2386 /*
2387 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2388 */
2389 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2390 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2391 "page_off: %u\n",
2392 (unsigned long long)tmp_sg->dma_address,
2393 tmp_sg->length, page_off);
2394
2395 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2396 ib_sge->length = min_t(u32, data_left,
2397 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2398 ib_sge->lkey = device->pd->local_dma_lkey;
2399
2400 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2401 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2402 page_off = 0;
2403 data_left -= ib_sge->length;
2404 if (!data_left)
2405 break;
2406 ib_sge++;
2407 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2408 }
2409
2410 rdma_wr->wr.num_sge = ++i;
2411 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2412 rdma_wr->wr.sg_list, rdma_wr->wr.num_sge);
2413
2414 return rdma_wr->wr.num_sge;
2415 }
2416
2417 static int
2418 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2419 struct isert_rdma_wr *wr)
2420 {
2421 struct se_cmd *se_cmd = &cmd->se_cmd;
2422 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2423 struct isert_conn *isert_conn = conn->context;
2424 struct isert_data_buf *data = &wr->data;
2425 struct ib_rdma_wr *rdma_wr;
2426 struct ib_sge *ib_sge;
2427 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2428 int ret = 0, i, ib_sge_cnt;
2429
2430 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2431
2432 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2433 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2434 se_cmd->t_data_nents, se_cmd->data_length,
2435 offset, wr->iser_ib_op, &wr->data);
2436 if (ret)
2437 return ret;
2438
2439 data_left = data->len;
2440 offset = data->offset;
2441
2442 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2443 if (!ib_sge) {
2444 isert_warn("Unable to allocate ib_sge\n");
2445 ret = -ENOMEM;
2446 goto unmap_cmd;
2447 }
2448 wr->ib_sge = ib_sge;
2449
2450 wr->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2451 wr->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) * wr->rdma_wr_num,
2452 GFP_KERNEL);
2453 if (!wr->rdma_wr) {
2454 isert_dbg("Unable to allocate wr->rdma_wr\n");
2455 ret = -ENOMEM;
2456 goto unmap_cmd;
2457 }
2458
2459 wr->isert_cmd = isert_cmd;
2460 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2461
2462 for (i = 0; i < wr->rdma_wr_num; i++) {
2463 rdma_wr = &isert_cmd->rdma_wr.rdma_wr[i];
2464 data_len = min(data_left, rdma_write_max);
2465
2466 rdma_wr->wr.send_flags = 0;
2467 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2468 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2469 rdma_wr->remote_addr = isert_cmd->read_va + offset;
2470 rdma_wr->rkey = isert_cmd->read_stag;
2471 if (i + 1 == wr->rdma_wr_num)
2472 rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr;
2473 else
2474 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2475 } else {
2476 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2477 rdma_wr->remote_addr = isert_cmd->write_va + va_offset;
2478 rdma_wr->rkey = isert_cmd->write_stag;
2479 if (i + 1 == wr->rdma_wr_num)
2480 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2481 else
2482 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2483 }
2484
2485 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2486 rdma_wr, data_len, offset);
2487 ib_sge += ib_sge_cnt;
2488
2489 offset += data_len;
2490 va_offset += data_len;
2491 data_left -= data_len;
2492 }
2493
2494 return 0;
2495 unmap_cmd:
2496 isert_unmap_data_buf(isert_conn, data);
2497
2498 return ret;
2499 }
2500
2501 static inline void
2502 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2503 {
2504 u32 rkey;
2505
2506 memset(inv_wr, 0, sizeof(*inv_wr));
2507 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2508 inv_wr->opcode = IB_WR_LOCAL_INV;
2509 inv_wr->ex.invalidate_rkey = mr->rkey;
2510
2511 /* Bump the key */
2512 rkey = ib_inc_rkey(mr->rkey);
2513 ib_update_fast_reg_key(mr, rkey);
2514 }
2515
2516 static int
2517 isert_fast_reg_mr(struct isert_conn *isert_conn,
2518 struct fast_reg_descriptor *fr_desc,
2519 struct isert_data_buf *mem,
2520 enum isert_indicator ind,
2521 struct ib_sge *sge)
2522 {
2523 struct isert_device *device = isert_conn->device;
2524 struct ib_device *ib_dev = device->ib_device;
2525 struct ib_mr *mr;
2526 struct ib_reg_wr reg_wr;
2527 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2528 int ret, n;
2529
2530 if (mem->dma_nents == 1) {
2531 sge->lkey = device->pd->local_dma_lkey;
2532 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2533 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2534 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2535 sge->addr, sge->length, sge->lkey);
2536 return 0;
2537 }
2538
2539 if (ind == ISERT_DATA_KEY_VALID)
2540 /* Registering data buffer */
2541 mr = fr_desc->data_mr;
2542 else
2543 /* Registering protection buffer */
2544 mr = fr_desc->pi_ctx->prot_mr;
2545
2546 if (!(fr_desc->ind & ind)) {
2547 isert_inv_rkey(&inv_wr, mr);
2548 wr = &inv_wr;
2549 }
2550
2551 n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE);
2552 if (unlikely(n != mem->nents)) {
2553 isert_err("failed to map mr sg (%d/%d)\n",
2554 n, mem->nents);
2555 return n < 0 ? n : -EINVAL;
2556 }
2557
2558 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2559 fr_desc, mem->nents, mem->offset);
2560
2561 reg_wr.wr.next = NULL;
2562 reg_wr.wr.opcode = IB_WR_REG_MR;
2563 reg_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2564 reg_wr.wr.send_flags = 0;
2565 reg_wr.wr.num_sge = 0;
2566 reg_wr.mr = mr;
2567 reg_wr.key = mr->lkey;
2568 reg_wr.access = IB_ACCESS_LOCAL_WRITE;
2569
2570 if (!wr)
2571 wr = &reg_wr.wr;
2572 else
2573 wr->next = &reg_wr.wr;
2574
2575 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2576 if (ret) {
2577 isert_err("fast registration failed, ret:%d\n", ret);
2578 return ret;
2579 }
2580 fr_desc->ind &= ~ind;
2581
2582 sge->lkey = mr->lkey;
2583 sge->addr = mr->iova;
2584 sge->length = mr->length;
2585
2586 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2587 sge->addr, sge->length, sge->lkey);
2588
2589 return ret;
2590 }
2591
2592 static inline void
2593 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2594 struct ib_sig_domain *domain)
2595 {
2596 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2597 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2598 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2599 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2600 /*
2601 * At the moment we hard code those, but if in the future
2602 * the target core would like to use it, we will take it
2603 * from se_cmd.
2604 */
2605 domain->sig.dif.apptag_check_mask = 0xffff;
2606 domain->sig.dif.app_escape = true;
2607 domain->sig.dif.ref_escape = true;
2608 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2609 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2610 domain->sig.dif.ref_remap = true;
2611 };
2612
2613 static int
2614 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2615 {
2616 switch (se_cmd->prot_op) {
2617 case TARGET_PROT_DIN_INSERT:
2618 case TARGET_PROT_DOUT_STRIP:
2619 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2620 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2621 break;
2622 case TARGET_PROT_DOUT_INSERT:
2623 case TARGET_PROT_DIN_STRIP:
2624 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2625 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2626 break;
2627 case TARGET_PROT_DIN_PASS:
2628 case TARGET_PROT_DOUT_PASS:
2629 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2630 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2631 break;
2632 default:
2633 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2634 return -EINVAL;
2635 }
2636
2637 return 0;
2638 }
2639
2640 static inline u8
2641 isert_set_prot_checks(u8 prot_checks)
2642 {
2643 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2644 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2645 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2646 }
2647
2648 static int
2649 isert_reg_sig_mr(struct isert_conn *isert_conn,
2650 struct se_cmd *se_cmd,
2651 struct isert_rdma_wr *rdma_wr,
2652 struct fast_reg_descriptor *fr_desc)
2653 {
2654 struct ib_sig_handover_wr sig_wr;
2655 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2656 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2657 struct ib_sig_attrs sig_attrs;
2658 int ret;
2659
2660 memset(&sig_attrs, 0, sizeof(sig_attrs));
2661 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2662 if (ret)
2663 goto err;
2664
2665 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2666
2667 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2668 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2669 wr = &inv_wr;
2670 }
2671
2672 memset(&sig_wr, 0, sizeof(sig_wr));
2673 sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
2674 sig_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2675 sig_wr.wr.sg_list = &rdma_wr->ib_sg[DATA];
2676 sig_wr.wr.num_sge = 1;
2677 sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
2678 sig_wr.sig_attrs = &sig_attrs;
2679 sig_wr.sig_mr = pi_ctx->sig_mr;
2680 if (se_cmd->t_prot_sg)
2681 sig_wr.prot = &rdma_wr->ib_sg[PROT];
2682
2683 if (!wr)
2684 wr = &sig_wr.wr;
2685 else
2686 wr->next = &sig_wr.wr;
2687
2688 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2689 if (ret) {
2690 isert_err("fast registration failed, ret:%d\n", ret);
2691 goto err;
2692 }
2693 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2694
2695 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2696 rdma_wr->ib_sg[SIG].addr = 0;
2697 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2698 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2699 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2700 /*
2701 * We have protection guards on the wire
2702 * so we need to set a larget transfer
2703 */
2704 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2705
2706 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2707 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2708 rdma_wr->ib_sg[SIG].lkey);
2709 err:
2710 return ret;
2711 }
2712
2713 static int
2714 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2715 struct isert_cmd *isert_cmd,
2716 struct isert_rdma_wr *wr)
2717 {
2718 struct isert_device *device = isert_conn->device;
2719 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2720 int ret;
2721
2722 if (!wr->fr_desc->pi_ctx) {
2723 ret = isert_create_pi_ctx(wr->fr_desc,
2724 device->ib_device,
2725 device->pd);
2726 if (ret) {
2727 isert_err("conn %p failed to allocate pi_ctx\n",
2728 isert_conn);
2729 return ret;
2730 }
2731 }
2732
2733 if (se_cmd->t_prot_sg) {
2734 ret = isert_map_data_buf(isert_conn, isert_cmd,
2735 se_cmd->t_prot_sg,
2736 se_cmd->t_prot_nents,
2737 se_cmd->prot_length,
2738 0, wr->iser_ib_op, &wr->prot);
2739 if (ret) {
2740 isert_err("conn %p failed to map protection buffer\n",
2741 isert_conn);
2742 return ret;
2743 }
2744
2745 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2746 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2747 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2748 if (ret) {
2749 isert_err("conn %p failed to fast reg mr\n",
2750 isert_conn);
2751 goto unmap_prot_cmd;
2752 }
2753 }
2754
2755 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2756 if (ret) {
2757 isert_err("conn %p failed to fast reg mr\n",
2758 isert_conn);
2759 goto unmap_prot_cmd;
2760 }
2761 wr->fr_desc->ind |= ISERT_PROTECTED;
2762
2763 return 0;
2764
2765 unmap_prot_cmd:
2766 if (se_cmd->t_prot_sg)
2767 isert_unmap_data_buf(isert_conn, &wr->prot);
2768
2769 return ret;
2770 }
2771
2772 static int
2773 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2774 struct isert_rdma_wr *wr)
2775 {
2776 struct se_cmd *se_cmd = &cmd->se_cmd;
2777 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2778 struct isert_conn *isert_conn = conn->context;
2779 struct fast_reg_descriptor *fr_desc = NULL;
2780 struct ib_rdma_wr *rdma_wr;
2781 struct ib_sge *ib_sg;
2782 u32 offset;
2783 int ret = 0;
2784 unsigned long flags;
2785
2786 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2787
2788 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2789 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2790 se_cmd->t_data_nents, se_cmd->data_length,
2791 offset, wr->iser_ib_op, &wr->data);
2792 if (ret)
2793 return ret;
2794
2795 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2796 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2797 fr_desc = list_first_entry(&isert_conn->fr_pool,
2798 struct fast_reg_descriptor, list);
2799 list_del(&fr_desc->list);
2800 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2801 wr->fr_desc = fr_desc;
2802 }
2803
2804 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2805 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2806 if (ret)
2807 goto unmap_cmd;
2808
2809 if (isert_prot_cmd(isert_conn, se_cmd)) {
2810 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2811 if (ret)
2812 goto unmap_cmd;
2813
2814 ib_sg = &wr->ib_sg[SIG];
2815 } else {
2816 ib_sg = &wr->ib_sg[DATA];
2817 }
2818
2819 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2820 wr->ib_sge = &wr->s_ib_sge;
2821 wr->rdma_wr_num = 1;
2822 memset(&wr->s_rdma_wr, 0, sizeof(wr->s_rdma_wr));
2823 wr->rdma_wr = &wr->s_rdma_wr;
2824 wr->isert_cmd = isert_cmd;
2825
2826 rdma_wr = &isert_cmd->rdma_wr.s_rdma_wr;
2827 rdma_wr->wr.sg_list = &wr->s_ib_sge;
2828 rdma_wr->wr.num_sge = 1;
2829 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2830 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2831 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2832 rdma_wr->remote_addr = isert_cmd->read_va;
2833 rdma_wr->rkey = isert_cmd->read_stag;
2834 rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2835 0 : IB_SEND_SIGNALED;
2836 } else {
2837 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2838 rdma_wr->remote_addr = isert_cmd->write_va;
2839 rdma_wr->rkey = isert_cmd->write_stag;
2840 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2841 }
2842
2843 return 0;
2844
2845 unmap_cmd:
2846 if (fr_desc) {
2847 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2848 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2849 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2850 }
2851 isert_unmap_data_buf(isert_conn, &wr->data);
2852
2853 return ret;
2854 }
2855
2856 static int
2857 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2858 {
2859 struct se_cmd *se_cmd = &cmd->se_cmd;
2860 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2861 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2862 struct isert_conn *isert_conn = conn->context;
2863 struct isert_device *device = isert_conn->device;
2864 struct ib_send_wr *wr_failed;
2865 int rc;
2866
2867 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2868 isert_cmd, se_cmd->data_length);
2869
2870 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2871 rc = device->reg_rdma_mem(conn, cmd, wr);
2872 if (rc) {
2873 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2874 return rc;
2875 }
2876
2877 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2878 /*
2879 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2880 */
2881 isert_create_send_desc(isert_conn, isert_cmd,
2882 &isert_cmd->tx_desc);
2883 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2884 &isert_cmd->tx_desc.iscsi_header);
2885 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2886 isert_init_send_wr(isert_conn, isert_cmd,
2887 &isert_cmd->tx_desc.send_wr);
2888 isert_cmd->rdma_wr.s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr;
2889 wr->rdma_wr_num += 1;
2890
2891 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2892 if (rc) {
2893 isert_err("ib_post_recv failed with %d\n", rc);
2894 return rc;
2895 }
2896 }
2897
2898 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2899 if (rc)
2900 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2901
2902 if (!isert_prot_cmd(isert_conn, se_cmd))
2903 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2904 "READ\n", isert_cmd);
2905 else
2906 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2907 isert_cmd);
2908
2909 return 1;
2910 }
2911
2912 static int
2913 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2914 {
2915 struct se_cmd *se_cmd = &cmd->se_cmd;
2916 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2917 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2918 struct isert_conn *isert_conn = conn->context;
2919 struct isert_device *device = isert_conn->device;
2920 struct ib_send_wr *wr_failed;
2921 int rc;
2922
2923 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2924 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2925 wr->iser_ib_op = ISER_IB_RDMA_READ;
2926 rc = device->reg_rdma_mem(conn, cmd, wr);
2927 if (rc) {
2928 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2929 return rc;
2930 }
2931
2932 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2933 if (rc)
2934 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2935
2936 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2937 isert_cmd);
2938
2939 return 0;
2940 }
2941
2942 static int
2943 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2944 {
2945 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2946 int ret = 0;
2947
2948 switch (state) {
2949 case ISTATE_REMOVE:
2950 spin_lock_bh(&conn->cmd_lock);
2951 list_del_init(&cmd->i_conn_node);
2952 spin_unlock_bh(&conn->cmd_lock);
2953 isert_put_cmd(isert_cmd, true);
2954 break;
2955 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2956 ret = isert_put_nopin(cmd, conn, false);
2957 break;
2958 default:
2959 isert_err("Unknown immediate state: 0x%02x\n", state);
2960 ret = -EINVAL;
2961 break;
2962 }
2963
2964 return ret;
2965 }
2966
2967 static int
2968 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2969 {
2970 struct isert_conn *isert_conn = conn->context;
2971 int ret;
2972
2973 switch (state) {
2974 case ISTATE_SEND_LOGOUTRSP:
2975 ret = isert_put_logout_rsp(cmd, conn);
2976 if (!ret)
2977 isert_conn->logout_posted = true;
2978 break;
2979 case ISTATE_SEND_NOPIN:
2980 ret = isert_put_nopin(cmd, conn, true);
2981 break;
2982 case ISTATE_SEND_TASKMGTRSP:
2983 ret = isert_put_tm_rsp(cmd, conn);
2984 break;
2985 case ISTATE_SEND_REJECT:
2986 ret = isert_put_reject(cmd, conn);
2987 break;
2988 case ISTATE_SEND_TEXTRSP:
2989 ret = isert_put_text_rsp(cmd, conn);
2990 break;
2991 case ISTATE_SEND_STATUS:
2992 /*
2993 * Special case for sending non GOOD SCSI status from TX thread
2994 * context during pre se_cmd excecution failure.
2995 */
2996 ret = isert_put_response(conn, cmd);
2997 break;
2998 default:
2999 isert_err("Unknown response state: 0x%02x\n", state);
3000 ret = -EINVAL;
3001 break;
3002 }
3003
3004 return ret;
3005 }
3006
3007 struct rdma_cm_id *
3008 isert_setup_id(struct isert_np *isert_np)
3009 {
3010 struct iscsi_np *np = isert_np->np;
3011 struct rdma_cm_id *id;
3012 struct sockaddr *sa;
3013 int ret;
3014
3015 sa = (struct sockaddr *)&np->np_sockaddr;
3016 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3017
3018 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
3019 RDMA_PS_TCP, IB_QPT_RC);
3020 if (IS_ERR(id)) {
3021 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3022 ret = PTR_ERR(id);
3023 goto out;
3024 }
3025 isert_dbg("id %p context %p\n", id, id->context);
3026
3027 ret = rdma_bind_addr(id, sa);
3028 if (ret) {
3029 isert_err("rdma_bind_addr() failed: %d\n", ret);
3030 goto out_id;
3031 }
3032
3033 ret = rdma_listen(id, 0);
3034 if (ret) {
3035 isert_err("rdma_listen() failed: %d\n", ret);
3036 goto out_id;
3037 }
3038
3039 return id;
3040 out_id:
3041 rdma_destroy_id(id);
3042 out:
3043 return ERR_PTR(ret);
3044 }
3045
3046 static int
3047 isert_setup_np(struct iscsi_np *np,
3048 struct sockaddr_storage *ksockaddr)
3049 {
3050 struct isert_np *isert_np;
3051 struct rdma_cm_id *isert_lid;
3052 int ret;
3053
3054 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3055 if (!isert_np) {
3056 isert_err("Unable to allocate struct isert_np\n");
3057 return -ENOMEM;
3058 }
3059 sema_init(&isert_np->sem, 0);
3060 mutex_init(&isert_np->mutex);
3061 INIT_LIST_HEAD(&isert_np->accepted);
3062 INIT_LIST_HEAD(&isert_np->pending);
3063 isert_np->np = np;
3064
3065 /*
3066 * Setup the np->np_sockaddr from the passed sockaddr setup
3067 * in iscsi_target_configfs.c code..
3068 */
3069 memcpy(&np->np_sockaddr, ksockaddr,
3070 sizeof(struct sockaddr_storage));
3071
3072 isert_lid = isert_setup_id(isert_np);
3073 if (IS_ERR(isert_lid)) {
3074 ret = PTR_ERR(isert_lid);
3075 goto out;
3076 }
3077
3078 isert_np->cm_id = isert_lid;
3079 np->np_context = isert_np;
3080
3081 return 0;
3082
3083 out:
3084 kfree(isert_np);
3085
3086 return ret;
3087 }
3088
3089 static int
3090 isert_rdma_accept(struct isert_conn *isert_conn)
3091 {
3092 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3093 struct rdma_conn_param cp;
3094 int ret;
3095
3096 memset(&cp, 0, sizeof(struct rdma_conn_param));
3097 cp.initiator_depth = isert_conn->initiator_depth;
3098 cp.retry_count = 7;
3099 cp.rnr_retry_count = 7;
3100
3101 ret = rdma_accept(cm_id, &cp);
3102 if (ret) {
3103 isert_err("rdma_accept() failed with: %d\n", ret);
3104 return ret;
3105 }
3106
3107 return 0;
3108 }
3109
3110 static int
3111 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3112 {
3113 struct isert_conn *isert_conn = conn->context;
3114 int ret;
3115
3116 isert_info("before login_req comp conn: %p\n", isert_conn);
3117 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3118 if (ret) {
3119 isert_err("isert_conn %p interrupted before got login req\n",
3120 isert_conn);
3121 return ret;
3122 }
3123 reinit_completion(&isert_conn->login_req_comp);
3124
3125 /*
3126 * For login requests after the first PDU, isert_rx_login_req() will
3127 * kick schedule_delayed_work(&conn->login_work) as the packet is
3128 * received, which turns this callback from iscsi_target_do_login_rx()
3129 * into a NOP.
3130 */
3131 if (!login->first_request)
3132 return 0;
3133
3134 isert_rx_login_req(isert_conn);
3135
3136 isert_info("before login_comp conn: %p\n", conn);
3137 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3138 if (ret)
3139 return ret;
3140
3141 isert_info("processing login->req: %p\n", login->req);
3142
3143 return 0;
3144 }
3145
3146 static void
3147 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3148 struct isert_conn *isert_conn)
3149 {
3150 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3151 struct rdma_route *cm_route = &cm_id->route;
3152
3153 conn->login_family = np->np_sockaddr.ss_family;
3154
3155 conn->login_sockaddr = cm_route->addr.dst_addr;
3156 conn->local_sockaddr = cm_route->addr.src_addr;
3157 }
3158
3159 static int
3160 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3161 {
3162 struct isert_np *isert_np = np->np_context;
3163 struct isert_conn *isert_conn;
3164 int ret;
3165
3166 accept_wait:
3167 ret = down_interruptible(&isert_np->sem);
3168 if (ret)
3169 return -ENODEV;
3170
3171 spin_lock_bh(&np->np_thread_lock);
3172 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3173 spin_unlock_bh(&np->np_thread_lock);
3174 isert_dbg("np_thread_state %d\n",
3175 np->np_thread_state);
3176 /**
3177 * No point in stalling here when np_thread
3178 * is in state RESET/SHUTDOWN/EXIT - bail
3179 **/
3180 return -ENODEV;
3181 }
3182 spin_unlock_bh(&np->np_thread_lock);
3183
3184 mutex_lock(&isert_np->mutex);
3185 if (list_empty(&isert_np->pending)) {
3186 mutex_unlock(&isert_np->mutex);
3187 goto accept_wait;
3188 }
3189 isert_conn = list_first_entry(&isert_np->pending,
3190 struct isert_conn, node);
3191 list_del_init(&isert_conn->node);
3192 mutex_unlock(&isert_np->mutex);
3193
3194 conn->context = isert_conn;
3195 isert_conn->conn = conn;
3196
3197 isert_set_conn_info(np, conn, isert_conn);
3198
3199 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3200
3201 return 0;
3202 }
3203
3204 static void
3205 isert_free_np(struct iscsi_np *np)
3206 {
3207 struct isert_np *isert_np = np->np_context;
3208 struct isert_conn *isert_conn, *n;
3209
3210 if (isert_np->cm_id)
3211 rdma_destroy_id(isert_np->cm_id);
3212
3213 /*
3214 * FIXME: At this point we don't have a good way to insure
3215 * that at this point we don't have hanging connections that
3216 * completed RDMA establishment but didn't start iscsi login
3217 * process. So work-around this by cleaning up what ever piled
3218 * up in accepted and pending lists.
3219 */
3220 mutex_lock(&isert_np->mutex);
3221 if (!list_empty(&isert_np->pending)) {
3222 isert_info("Still have isert pending connections\n");
3223 list_for_each_entry_safe(isert_conn, n,
3224 &isert_np->pending,
3225 node) {
3226 isert_info("cleaning isert_conn %p state (%d)\n",
3227 isert_conn, isert_conn->state);
3228 isert_connect_release(isert_conn);
3229 }
3230 }
3231
3232 if (!list_empty(&isert_np->accepted)) {
3233 isert_info("Still have isert accepted connections\n");
3234 list_for_each_entry_safe(isert_conn, n,
3235 &isert_np->accepted,
3236 node) {
3237 isert_info("cleaning isert_conn %p state (%d)\n",
3238 isert_conn, isert_conn->state);
3239 isert_connect_release(isert_conn);
3240 }
3241 }
3242 mutex_unlock(&isert_np->mutex);
3243
3244 np->np_context = NULL;
3245 kfree(isert_np);
3246 }
3247
3248 static void isert_release_work(struct work_struct *work)
3249 {
3250 struct isert_conn *isert_conn = container_of(work,
3251 struct isert_conn,
3252 release_work);
3253
3254 isert_info("Starting release conn %p\n", isert_conn);
3255
3256 wait_for_completion(&isert_conn->wait);
3257
3258 mutex_lock(&isert_conn->mutex);
3259 isert_conn->state = ISER_CONN_DOWN;
3260 mutex_unlock(&isert_conn->mutex);
3261
3262 isert_info("Destroying conn %p\n", isert_conn);
3263 isert_put_conn(isert_conn);
3264 }
3265
3266 static void
3267 isert_wait4logout(struct isert_conn *isert_conn)
3268 {
3269 struct iscsi_conn *conn = isert_conn->conn;
3270
3271 isert_info("conn %p\n", isert_conn);
3272
3273 if (isert_conn->logout_posted) {
3274 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3275 wait_for_completion_timeout(&conn->conn_logout_comp,
3276 SECONDS_FOR_LOGOUT_COMP * HZ);
3277 }
3278 }
3279
3280 static void
3281 isert_wait4cmds(struct iscsi_conn *conn)
3282 {
3283 isert_info("iscsi_conn %p\n", conn);
3284
3285 if (conn->sess) {
3286 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3287 target_wait_for_sess_cmds(conn->sess->se_sess);
3288 }
3289 }
3290
3291 static void
3292 isert_wait4flush(struct isert_conn *isert_conn)
3293 {
3294 struct ib_recv_wr *bad_wr;
3295
3296 isert_info("conn %p\n", isert_conn);
3297
3298 init_completion(&isert_conn->wait_comp_err);
3299 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3300 /* post an indication that all flush errors were consumed */
3301 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3302 isert_err("conn %p failed to post beacon", isert_conn);
3303 return;
3304 }
3305
3306 wait_for_completion(&isert_conn->wait_comp_err);
3307 }
3308
3309 /**
3310 * isert_put_unsol_pending_cmds() - Drop commands waiting for
3311 * unsolicitate dataout
3312 * @conn: iscsi connection
3313 *
3314 * We might still have commands that are waiting for unsolicited
3315 * dataouts messages. We must put the extra reference on those
3316 * before blocking on the target_wait_for_session_cmds
3317 */
3318 static void
3319 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3320 {
3321 struct iscsi_cmd *cmd, *tmp;
3322 static LIST_HEAD(drop_cmd_list);
3323
3324 spin_lock_bh(&conn->cmd_lock);
3325 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3326 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3327 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3328 (cmd->write_data_done < cmd->se_cmd.data_length))
3329 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3330 }
3331 spin_unlock_bh(&conn->cmd_lock);
3332
3333 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3334 list_del_init(&cmd->i_conn_node);
3335 if (cmd->i_state != ISTATE_REMOVE) {
3336 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3337
3338 isert_info("conn %p dropping cmd %p\n", conn, cmd);
3339 isert_put_cmd(isert_cmd, true);
3340 }
3341 }
3342 }
3343
3344 static void isert_wait_conn(struct iscsi_conn *conn)
3345 {
3346 struct isert_conn *isert_conn = conn->context;
3347
3348 isert_info("Starting conn %p\n", isert_conn);
3349
3350 mutex_lock(&isert_conn->mutex);
3351 /*
3352 * Only wait for wait_comp_err if the isert_conn made it
3353 * into full feature phase..
3354 */
3355 if (isert_conn->state == ISER_CONN_INIT) {
3356 mutex_unlock(&isert_conn->mutex);
3357 return;
3358 }
3359 isert_conn_terminate(isert_conn);
3360 mutex_unlock(&isert_conn->mutex);
3361
3362 isert_wait4flush(isert_conn);
3363 isert_put_unsol_pending_cmds(conn);
3364 isert_wait4cmds(conn);
3365 isert_wait4logout(isert_conn);
3366
3367 queue_work(isert_release_wq, &isert_conn->release_work);
3368 }
3369
3370 static void isert_free_conn(struct iscsi_conn *conn)
3371 {
3372 struct isert_conn *isert_conn = conn->context;
3373
3374 isert_wait4flush(isert_conn);
3375 isert_put_conn(isert_conn);
3376 }
3377
3378 static struct iscsit_transport iser_target_transport = {
3379 .name = "IB/iSER",
3380 .transport_type = ISCSI_INFINIBAND,
3381 .priv_size = sizeof(struct isert_cmd),
3382 .owner = THIS_MODULE,
3383 .iscsit_setup_np = isert_setup_np,
3384 .iscsit_accept_np = isert_accept_np,
3385 .iscsit_free_np = isert_free_np,
3386 .iscsit_wait_conn = isert_wait_conn,
3387 .iscsit_free_conn = isert_free_conn,
3388 .iscsit_get_login_rx = isert_get_login_rx,
3389 .iscsit_put_login_tx = isert_put_login_tx,
3390 .iscsit_immediate_queue = isert_immediate_queue,
3391 .iscsit_response_queue = isert_response_queue,
3392 .iscsit_get_dataout = isert_get_dataout,
3393 .iscsit_queue_data_in = isert_put_datain,
3394 .iscsit_queue_status = isert_put_response,
3395 .iscsit_aborted_task = isert_aborted_task,
3396 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3397 };
3398
3399 static int __init isert_init(void)
3400 {
3401 int ret;
3402
3403 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3404 WQ_UNBOUND | WQ_HIGHPRI, 0);
3405 if (!isert_comp_wq) {
3406 isert_err("Unable to allocate isert_comp_wq\n");
3407 ret = -ENOMEM;
3408 return -ENOMEM;
3409 }
3410
3411 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3412 WQ_UNBOUND_MAX_ACTIVE);
3413 if (!isert_release_wq) {
3414 isert_err("Unable to allocate isert_release_wq\n");
3415 ret = -ENOMEM;
3416 goto destroy_comp_wq;
3417 }
3418
3419 iscsit_register_transport(&iser_target_transport);
3420 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3421
3422 return 0;
3423
3424 destroy_comp_wq:
3425 destroy_workqueue(isert_comp_wq);
3426
3427 return ret;
3428 }
3429
3430 static void __exit isert_exit(void)
3431 {
3432 flush_scheduled_work();
3433 destroy_workqueue(isert_release_wq);
3434 destroy_workqueue(isert_comp_wq);
3435 iscsit_unregister_transport(&iser_target_transport);
3436 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3437 }
3438
3439 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3440 MODULE_VERSION("1.0");
3441 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3442 MODULE_LICENSE("GPL");
3443
3444 module_init(isert_init);
3445 module_exit(isert_exit);
Linux kernel - Deliverables
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