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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[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 /*
161 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
162 * work-around for RDMA_READs with ConnectX-2.
163 *
164 * Also, still make sure to have at least two SGEs for
165 * outgoing control PDU responses.
166 */
167 attr.cap.max_send_sge = max(2, device->dev_attr.max_sge - 2);
168 isert_conn->max_sge = attr.cap.max_send_sge;
169
170 attr.cap.max_recv_sge = 1;
171 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
172 attr.qp_type = IB_QPT_RC;
173 if (device->pi_capable)
174 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
175
176 ret = rdma_create_qp(cma_id, device->pd, &attr);
177 if (ret) {
178 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
179 return ERR_PTR(ret);
180 }
181
182 return cma_id->qp;
183 }
184
185 static int
186 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
187 {
188 struct isert_comp *comp;
189 int ret;
190
191 comp = isert_comp_get(isert_conn);
192 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
193 if (IS_ERR(isert_conn->qp)) {
194 ret = PTR_ERR(isert_conn->qp);
195 goto err;
196 }
197
198 return 0;
199 err:
200 isert_comp_put(comp);
201 return ret;
202 }
203
204 static void
205 isert_cq_event_callback(struct ib_event *e, void *context)
206 {
207 isert_dbg("event: %d\n", e->event);
208 }
209
210 static int
211 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
212 {
213 struct isert_device *device = isert_conn->device;
214 struct ib_device *ib_dev = device->ib_device;
215 struct iser_rx_desc *rx_desc;
216 struct ib_sge *rx_sg;
217 u64 dma_addr;
218 int i, j;
219
220 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
221 sizeof(struct iser_rx_desc), GFP_KERNEL);
222 if (!isert_conn->rx_descs)
223 goto fail;
224
225 rx_desc = isert_conn->rx_descs;
226
227 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
228 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
229 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
230 if (ib_dma_mapping_error(ib_dev, dma_addr))
231 goto dma_map_fail;
232
233 rx_desc->dma_addr = dma_addr;
234
235 rx_sg = &rx_desc->rx_sg;
236 rx_sg->addr = rx_desc->dma_addr;
237 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
238 rx_sg->lkey = device->mr->lkey;
239 }
240
241 isert_conn->rx_desc_head = 0;
242
243 return 0;
244
245 dma_map_fail:
246 rx_desc = isert_conn->rx_descs;
247 for (j = 0; j < i; j++, rx_desc++) {
248 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
249 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
250 }
251 kfree(isert_conn->rx_descs);
252 isert_conn->rx_descs = NULL;
253 fail:
254 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
255
256 return -ENOMEM;
257 }
258
259 static void
260 isert_free_rx_descriptors(struct isert_conn *isert_conn)
261 {
262 struct ib_device *ib_dev = isert_conn->device->ib_device;
263 struct iser_rx_desc *rx_desc;
264 int i;
265
266 if (!isert_conn->rx_descs)
267 return;
268
269 rx_desc = isert_conn->rx_descs;
270 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
271 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
272 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
273 }
274
275 kfree(isert_conn->rx_descs);
276 isert_conn->rx_descs = NULL;
277 }
278
279 static void isert_cq_work(struct work_struct *);
280 static void isert_cq_callback(struct ib_cq *, void *);
281
282 static void
283 isert_free_comps(struct isert_device *device)
284 {
285 int i;
286
287 for (i = 0; i < device->comps_used; i++) {
288 struct isert_comp *comp = &device->comps[i];
289
290 if (comp->cq) {
291 cancel_work_sync(&comp->work);
292 ib_destroy_cq(comp->cq);
293 }
294 }
295 kfree(device->comps);
296 }
297
298 static int
299 isert_alloc_comps(struct isert_device *device,
300 struct ib_device_attr *attr)
301 {
302 int i, max_cqe, ret = 0;
303
304 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
305 device->ib_device->num_comp_vectors));
306
307 isert_info("Using %d CQs, %s supports %d vectors support "
308 "Fast registration %d pi_capable %d\n",
309 device->comps_used, device->ib_device->name,
310 device->ib_device->num_comp_vectors, device->use_fastreg,
311 device->pi_capable);
312
313 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
314 GFP_KERNEL);
315 if (!device->comps) {
316 isert_err("Unable to allocate completion contexts\n");
317 return -ENOMEM;
318 }
319
320 max_cqe = min(ISER_MAX_CQ_LEN, attr->max_cqe);
321
322 for (i = 0; i < device->comps_used; i++) {
323 struct ib_cq_init_attr cq_attr = {};
324 struct isert_comp *comp = &device->comps[i];
325
326 comp->device = device;
327 INIT_WORK(&comp->work, isert_cq_work);
328 cq_attr.cqe = max_cqe;
329 cq_attr.comp_vector = i;
330 comp->cq = ib_create_cq(device->ib_device,
331 isert_cq_callback,
332 isert_cq_event_callback,
333 (void *)comp,
334 &cq_attr);
335 if (IS_ERR(comp->cq)) {
336 isert_err("Unable to allocate cq\n");
337 ret = PTR_ERR(comp->cq);
338 comp->cq = NULL;
339 goto out_cq;
340 }
341
342 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
343 if (ret)
344 goto out_cq;
345 }
346
347 return 0;
348 out_cq:
349 isert_free_comps(device);
350 return ret;
351 }
352
353 static int
354 isert_create_device_ib_res(struct isert_device *device)
355 {
356 struct ib_device_attr *dev_attr;
357 int ret;
358
359 dev_attr = &device->dev_attr;
360 ret = isert_query_device(device->ib_device, dev_attr);
361 if (ret)
362 return ret;
363
364 /* asign function handlers */
365 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
366 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
367 device->use_fastreg = 1;
368 device->reg_rdma_mem = isert_reg_rdma;
369 device->unreg_rdma_mem = isert_unreg_rdma;
370 } else {
371 device->use_fastreg = 0;
372 device->reg_rdma_mem = isert_map_rdma;
373 device->unreg_rdma_mem = isert_unmap_cmd;
374 }
375
376 ret = isert_alloc_comps(device, dev_attr);
377 if (ret)
378 return ret;
379
380 device->pd = ib_alloc_pd(device->ib_device);
381 if (IS_ERR(device->pd)) {
382 ret = PTR_ERR(device->pd);
383 isert_err("failed to allocate pd, device %p, ret=%d\n",
384 device, ret);
385 goto out_cq;
386 }
387
388 device->mr = ib_get_dma_mr(device->pd, IB_ACCESS_LOCAL_WRITE);
389 if (IS_ERR(device->mr)) {
390 ret = PTR_ERR(device->mr);
391 isert_err("failed to create dma mr, device %p, ret=%d\n",
392 device, ret);
393 goto out_mr;
394 }
395
396 /* Check signature cap */
397 device->pi_capable = dev_attr->device_cap_flags &
398 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
399
400 return 0;
401
402 out_mr:
403 ib_dealloc_pd(device->pd);
404 out_cq:
405 isert_free_comps(device);
406 return ret;
407 }
408
409 static void
410 isert_free_device_ib_res(struct isert_device *device)
411 {
412 isert_info("device %p\n", device);
413
414 ib_dereg_mr(device->mr);
415 ib_dealloc_pd(device->pd);
416 isert_free_comps(device);
417 }
418
419 static void
420 isert_device_put(struct isert_device *device)
421 {
422 mutex_lock(&device_list_mutex);
423 device->refcount--;
424 isert_info("device %p refcount %d\n", device, device->refcount);
425 if (!device->refcount) {
426 isert_free_device_ib_res(device);
427 list_del(&device->dev_node);
428 kfree(device);
429 }
430 mutex_unlock(&device_list_mutex);
431 }
432
433 static struct isert_device *
434 isert_device_get(struct rdma_cm_id *cma_id)
435 {
436 struct isert_device *device;
437 int ret;
438
439 mutex_lock(&device_list_mutex);
440 list_for_each_entry(device, &device_list, dev_node) {
441 if (device->ib_device->node_guid == cma_id->device->node_guid) {
442 device->refcount++;
443 isert_info("Found iser device %p refcount %d\n",
444 device, device->refcount);
445 mutex_unlock(&device_list_mutex);
446 return device;
447 }
448 }
449
450 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
451 if (!device) {
452 mutex_unlock(&device_list_mutex);
453 return ERR_PTR(-ENOMEM);
454 }
455
456 INIT_LIST_HEAD(&device->dev_node);
457
458 device->ib_device = cma_id->device;
459 ret = isert_create_device_ib_res(device);
460 if (ret) {
461 kfree(device);
462 mutex_unlock(&device_list_mutex);
463 return ERR_PTR(ret);
464 }
465
466 device->refcount++;
467 list_add_tail(&device->dev_node, &device_list);
468 isert_info("Created a new iser device %p refcount %d\n",
469 device, device->refcount);
470 mutex_unlock(&device_list_mutex);
471
472 return device;
473 }
474
475 static void
476 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
477 {
478 struct fast_reg_descriptor *fr_desc, *tmp;
479 int i = 0;
480
481 if (list_empty(&isert_conn->fr_pool))
482 return;
483
484 isert_info("Freeing conn %p fastreg pool", isert_conn);
485
486 list_for_each_entry_safe(fr_desc, tmp,
487 &isert_conn->fr_pool, list) {
488 list_del(&fr_desc->list);
489 ib_free_fast_reg_page_list(fr_desc->data_frpl);
490 ib_dereg_mr(fr_desc->data_mr);
491 if (fr_desc->pi_ctx) {
492 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
493 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
494 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
495 kfree(fr_desc->pi_ctx);
496 }
497 kfree(fr_desc);
498 ++i;
499 }
500
501 if (i < isert_conn->fr_pool_size)
502 isert_warn("Pool still has %d regions registered\n",
503 isert_conn->fr_pool_size - i);
504 }
505
506 static int
507 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
508 struct ib_device *device,
509 struct ib_pd *pd)
510 {
511 struct ib_mr_init_attr mr_init_attr;
512 struct pi_context *pi_ctx;
513 int ret;
514
515 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
516 if (!pi_ctx) {
517 isert_err("Failed to allocate pi context\n");
518 return -ENOMEM;
519 }
520
521 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(device,
522 ISCSI_ISER_SG_TABLESIZE);
523 if (IS_ERR(pi_ctx->prot_frpl)) {
524 isert_err("Failed to allocate prot frpl err=%ld\n",
525 PTR_ERR(pi_ctx->prot_frpl));
526 ret = PTR_ERR(pi_ctx->prot_frpl);
527 goto err_pi_ctx;
528 }
529
530 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
531 if (IS_ERR(pi_ctx->prot_mr)) {
532 isert_err("Failed to allocate prot frmr err=%ld\n",
533 PTR_ERR(pi_ctx->prot_mr));
534 ret = PTR_ERR(pi_ctx->prot_mr);
535 goto err_prot_frpl;
536 }
537 desc->ind |= ISERT_PROT_KEY_VALID;
538
539 memset(&mr_init_attr, 0, sizeof(mr_init_attr));
540 mr_init_attr.max_reg_descriptors = 2;
541 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
542 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
543 if (IS_ERR(pi_ctx->sig_mr)) {
544 isert_err("Failed to allocate signature enabled mr err=%ld\n",
545 PTR_ERR(pi_ctx->sig_mr));
546 ret = PTR_ERR(pi_ctx->sig_mr);
547 goto err_prot_mr;
548 }
549
550 desc->pi_ctx = pi_ctx;
551 desc->ind |= ISERT_SIG_KEY_VALID;
552 desc->ind &= ~ISERT_PROTECTED;
553
554 return 0;
555
556 err_prot_mr:
557 ib_dereg_mr(pi_ctx->prot_mr);
558 err_prot_frpl:
559 ib_free_fast_reg_page_list(pi_ctx->prot_frpl);
560 err_pi_ctx:
561 kfree(pi_ctx);
562
563 return ret;
564 }
565
566 static int
567 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
568 struct fast_reg_descriptor *fr_desc)
569 {
570 int ret;
571
572 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
573 ISCSI_ISER_SG_TABLESIZE);
574 if (IS_ERR(fr_desc->data_frpl)) {
575 isert_err("Failed to allocate data frpl err=%ld\n",
576 PTR_ERR(fr_desc->data_frpl));
577 return PTR_ERR(fr_desc->data_frpl);
578 }
579
580 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
581 if (IS_ERR(fr_desc->data_mr)) {
582 isert_err("Failed to allocate data frmr err=%ld\n",
583 PTR_ERR(fr_desc->data_mr));
584 ret = PTR_ERR(fr_desc->data_mr);
585 goto err_data_frpl;
586 }
587 fr_desc->ind |= ISERT_DATA_KEY_VALID;
588
589 isert_dbg("Created fr_desc %p\n", fr_desc);
590
591 return 0;
592
593 err_data_frpl:
594 ib_free_fast_reg_page_list(fr_desc->data_frpl);
595
596 return ret;
597 }
598
599 static int
600 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
601 {
602 struct fast_reg_descriptor *fr_desc;
603 struct isert_device *device = isert_conn->device;
604 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
605 struct se_node_acl *se_nacl = se_sess->se_node_acl;
606 int i, ret, tag_num;
607 /*
608 * Setup the number of FRMRs based upon the number of tags
609 * available to session in iscsi_target_locate_portal().
610 */
611 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
612 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
613
614 isert_conn->fr_pool_size = 0;
615 for (i = 0; i < tag_num; i++) {
616 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
617 if (!fr_desc) {
618 isert_err("Failed to allocate fast_reg descriptor\n");
619 ret = -ENOMEM;
620 goto err;
621 }
622
623 ret = isert_create_fr_desc(device->ib_device,
624 device->pd, fr_desc);
625 if (ret) {
626 isert_err("Failed to create fastreg descriptor err=%d\n",
627 ret);
628 kfree(fr_desc);
629 goto err;
630 }
631
632 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
633 isert_conn->fr_pool_size++;
634 }
635
636 isert_dbg("Creating conn %p fastreg pool size=%d",
637 isert_conn, isert_conn->fr_pool_size);
638
639 return 0;
640
641 err:
642 isert_conn_free_fastreg_pool(isert_conn);
643 return ret;
644 }
645
646 static void
647 isert_init_conn(struct isert_conn *isert_conn)
648 {
649 isert_conn->state = ISER_CONN_INIT;
650 INIT_LIST_HEAD(&isert_conn->accept_node);
651 init_completion(&isert_conn->login_comp);
652 init_completion(&isert_conn->login_req_comp);
653 init_completion(&isert_conn->wait);
654 kref_init(&isert_conn->kref);
655 mutex_init(&isert_conn->mutex);
656 spin_lock_init(&isert_conn->pool_lock);
657 INIT_LIST_HEAD(&isert_conn->fr_pool);
658 INIT_WORK(&isert_conn->release_work, isert_release_work);
659 }
660
661 static void
662 isert_free_login_buf(struct isert_conn *isert_conn)
663 {
664 struct ib_device *ib_dev = isert_conn->device->ib_device;
665
666 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
667 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
668 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
669 ISCSI_DEF_MAX_RECV_SEG_LEN,
670 DMA_FROM_DEVICE);
671 kfree(isert_conn->login_buf);
672 }
673
674 static int
675 isert_alloc_login_buf(struct isert_conn *isert_conn,
676 struct ib_device *ib_dev)
677 {
678 int ret;
679
680 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
681 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
682 if (!isert_conn->login_buf) {
683 isert_err("Unable to allocate isert_conn->login_buf\n");
684 return -ENOMEM;
685 }
686
687 isert_conn->login_req_buf = isert_conn->login_buf;
688 isert_conn->login_rsp_buf = isert_conn->login_buf +
689 ISCSI_DEF_MAX_RECV_SEG_LEN;
690
691 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
692 isert_conn->login_buf, isert_conn->login_req_buf,
693 isert_conn->login_rsp_buf);
694
695 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
696 (void *)isert_conn->login_req_buf,
697 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
698
699 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
700 if (ret) {
701 isert_err("login_req_dma mapping error: %d\n", ret);
702 isert_conn->login_req_dma = 0;
703 goto out_login_buf;
704 }
705
706 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
707 (void *)isert_conn->login_rsp_buf,
708 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
709
710 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
711 if (ret) {
712 isert_err("login_rsp_dma mapping error: %d\n", ret);
713 isert_conn->login_rsp_dma = 0;
714 goto out_req_dma_map;
715 }
716
717 return 0;
718
719 out_req_dma_map:
720 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
721 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
722 out_login_buf:
723 kfree(isert_conn->login_buf);
724 return ret;
725 }
726
727 static int
728 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
729 {
730 struct isert_np *isert_np = cma_id->context;
731 struct iscsi_np *np = isert_np->np;
732 struct isert_conn *isert_conn;
733 struct isert_device *device;
734 int ret = 0;
735
736 spin_lock_bh(&np->np_thread_lock);
737 if (!np->enabled) {
738 spin_unlock_bh(&np->np_thread_lock);
739 isert_dbg("iscsi_np is not enabled, reject connect request\n");
740 return rdma_reject(cma_id, NULL, 0);
741 }
742 spin_unlock_bh(&np->np_thread_lock);
743
744 isert_dbg("cma_id: %p, portal: %p\n",
745 cma_id, cma_id->context);
746
747 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
748 if (!isert_conn)
749 return -ENOMEM;
750
751 isert_init_conn(isert_conn);
752 isert_conn->cm_id = cma_id;
753
754 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
755 if (ret)
756 goto out;
757
758 device = isert_device_get(cma_id);
759 if (IS_ERR(device)) {
760 ret = PTR_ERR(device);
761 goto out_rsp_dma_map;
762 }
763 isert_conn->device = device;
764
765 /* Set max inflight RDMA READ requests */
766 isert_conn->initiator_depth = min_t(u8,
767 event->param.conn.initiator_depth,
768 device->dev_attr.max_qp_init_rd_atom);
769 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
770
771 ret = isert_conn_setup_qp(isert_conn, cma_id);
772 if (ret)
773 goto out_conn_dev;
774
775 ret = isert_rdma_post_recvl(isert_conn);
776 if (ret)
777 goto out_conn_dev;
778
779 ret = isert_rdma_accept(isert_conn);
780 if (ret)
781 goto out_conn_dev;
782
783 mutex_lock(&isert_np->np_accept_mutex);
784 list_add_tail(&isert_conn->accept_node, &isert_np->np_accept_list);
785 mutex_unlock(&isert_np->np_accept_mutex);
786
787 isert_info("np %p: Allow accept_np to continue\n", np);
788 up(&isert_np->np_sem);
789 return 0;
790
791 out_conn_dev:
792 isert_device_put(device);
793 out_rsp_dma_map:
794 isert_free_login_buf(isert_conn);
795 out:
796 kfree(isert_conn);
797 rdma_reject(cma_id, NULL, 0);
798 return ret;
799 }
800
801 static void
802 isert_connect_release(struct isert_conn *isert_conn)
803 {
804 struct isert_device *device = isert_conn->device;
805
806 isert_dbg("conn %p\n", isert_conn);
807
808 BUG_ON(!device);
809
810 if (device->use_fastreg)
811 isert_conn_free_fastreg_pool(isert_conn);
812
813 isert_free_rx_descriptors(isert_conn);
814 if (isert_conn->cm_id)
815 rdma_destroy_id(isert_conn->cm_id);
816
817 if (isert_conn->qp) {
818 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
819
820 isert_comp_put(comp);
821 ib_destroy_qp(isert_conn->qp);
822 }
823
824 if (isert_conn->login_buf)
825 isert_free_login_buf(isert_conn);
826
827 isert_device_put(device);
828
829 kfree(isert_conn);
830 }
831
832 static void
833 isert_connected_handler(struct rdma_cm_id *cma_id)
834 {
835 struct isert_conn *isert_conn = cma_id->qp->qp_context;
836
837 isert_info("conn %p\n", isert_conn);
838
839 if (!kref_get_unless_zero(&isert_conn->kref)) {
840 isert_warn("conn %p connect_release is running\n", isert_conn);
841 return;
842 }
843
844 mutex_lock(&isert_conn->mutex);
845 if (isert_conn->state != ISER_CONN_FULL_FEATURE)
846 isert_conn->state = ISER_CONN_UP;
847 mutex_unlock(&isert_conn->mutex);
848 }
849
850 static void
851 isert_release_kref(struct kref *kref)
852 {
853 struct isert_conn *isert_conn = container_of(kref,
854 struct isert_conn, kref);
855
856 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
857 current->pid);
858
859 isert_connect_release(isert_conn);
860 }
861
862 static void
863 isert_put_conn(struct isert_conn *isert_conn)
864 {
865 kref_put(&isert_conn->kref, isert_release_kref);
866 }
867
868 /**
869 * isert_conn_terminate() - Initiate connection termination
870 * @isert_conn: isert connection struct
871 *
872 * Notes:
873 * In case the connection state is FULL_FEATURE, move state
874 * to TEMINATING and start teardown sequence (rdma_disconnect).
875 * In case the connection state is UP, complete flush as well.
876 *
877 * This routine must be called with mutex held. Thus it is
878 * safe to call multiple times.
879 */
880 static void
881 isert_conn_terminate(struct isert_conn *isert_conn)
882 {
883 int err;
884
885 switch (isert_conn->state) {
886 case ISER_CONN_TERMINATING:
887 break;
888 case ISER_CONN_UP:
889 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
890 isert_info("Terminating conn %p state %d\n",
891 isert_conn, isert_conn->state);
892 isert_conn->state = ISER_CONN_TERMINATING;
893 err = rdma_disconnect(isert_conn->cm_id);
894 if (err)
895 isert_warn("Failed rdma_disconnect isert_conn %p\n",
896 isert_conn);
897 break;
898 default:
899 isert_warn("conn %p teminating in state %d\n",
900 isert_conn, isert_conn->state);
901 }
902 }
903
904 static int
905 isert_np_cma_handler(struct isert_np *isert_np,
906 enum rdma_cm_event_type event)
907 {
908 isert_dbg("%s (%d): isert np %p\n",
909 rdma_event_msg(event), event, isert_np);
910
911 switch (event) {
912 case RDMA_CM_EVENT_DEVICE_REMOVAL:
913 isert_np->np_cm_id = NULL;
914 break;
915 case RDMA_CM_EVENT_ADDR_CHANGE:
916 isert_np->np_cm_id = isert_setup_id(isert_np);
917 if (IS_ERR(isert_np->np_cm_id)) {
918 isert_err("isert np %p setup id failed: %ld\n",
919 isert_np, PTR_ERR(isert_np->np_cm_id));
920 isert_np->np_cm_id = NULL;
921 }
922 break;
923 default:
924 isert_err("isert np %p Unexpected event %d\n",
925 isert_np, event);
926 }
927
928 return -1;
929 }
930
931 static int
932 isert_disconnected_handler(struct rdma_cm_id *cma_id,
933 enum rdma_cm_event_type event)
934 {
935 struct isert_np *isert_np = cma_id->context;
936 struct isert_conn *isert_conn;
937 bool terminating = false;
938
939 if (isert_np->np_cm_id == cma_id)
940 return isert_np_cma_handler(cma_id->context, event);
941
942 isert_conn = cma_id->qp->qp_context;
943
944 mutex_lock(&isert_conn->mutex);
945 terminating = (isert_conn->state == ISER_CONN_TERMINATING);
946 isert_conn_terminate(isert_conn);
947 mutex_unlock(&isert_conn->mutex);
948
949 isert_info("conn %p completing wait\n", isert_conn);
950 complete(&isert_conn->wait);
951
952 if (terminating)
953 goto out;
954
955 mutex_lock(&isert_np->np_accept_mutex);
956 if (!list_empty(&isert_conn->accept_node)) {
957 list_del_init(&isert_conn->accept_node);
958 isert_put_conn(isert_conn);
959 queue_work(isert_release_wq, &isert_conn->release_work);
960 }
961 mutex_unlock(&isert_np->np_accept_mutex);
962
963 out:
964 return 0;
965 }
966
967 static int
968 isert_connect_error(struct rdma_cm_id *cma_id)
969 {
970 struct isert_conn *isert_conn = cma_id->qp->qp_context;
971
972 isert_conn->cm_id = NULL;
973 isert_put_conn(isert_conn);
974
975 return -1;
976 }
977
978 static int
979 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
980 {
981 int ret = 0;
982
983 isert_info("%s (%d): status %d id %p np %p\n",
984 rdma_event_msg(event->event), event->event,
985 event->status, cma_id, cma_id->context);
986
987 switch (event->event) {
988 case RDMA_CM_EVENT_CONNECT_REQUEST:
989 ret = isert_connect_request(cma_id, event);
990 if (ret)
991 isert_err("failed handle connect request %d\n", ret);
992 break;
993 case RDMA_CM_EVENT_ESTABLISHED:
994 isert_connected_handler(cma_id);
995 break;
996 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
997 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
998 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
999 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
1000 ret = isert_disconnected_handler(cma_id, event->event);
1001 break;
1002 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
1003 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
1004 case RDMA_CM_EVENT_CONNECT_ERROR:
1005 ret = isert_connect_error(cma_id);
1006 break;
1007 default:
1008 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
1009 break;
1010 }
1011
1012 return ret;
1013 }
1014
1015 static int
1016 isert_post_recv(struct isert_conn *isert_conn, u32 count)
1017 {
1018 struct ib_recv_wr *rx_wr, *rx_wr_failed;
1019 int i, ret;
1020 unsigned int rx_head = isert_conn->rx_desc_head;
1021 struct iser_rx_desc *rx_desc;
1022
1023 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
1024 rx_desc = &isert_conn->rx_descs[rx_head];
1025 rx_wr->wr_id = (uintptr_t)rx_desc;
1026 rx_wr->sg_list = &rx_desc->rx_sg;
1027 rx_wr->num_sge = 1;
1028 rx_wr->next = rx_wr + 1;
1029 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
1030 }
1031
1032 rx_wr--;
1033 rx_wr->next = NULL; /* mark end of work requests list */
1034
1035 isert_conn->post_recv_buf_count += count;
1036 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
1037 &rx_wr_failed);
1038 if (ret) {
1039 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1040 isert_conn->post_recv_buf_count -= count;
1041 } else {
1042 isert_dbg("Posted %d RX buffers\n", count);
1043 isert_conn->rx_desc_head = rx_head;
1044 }
1045 return ret;
1046 }
1047
1048 static int
1049 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1050 {
1051 struct ib_device *ib_dev = isert_conn->cm_id->device;
1052 struct ib_send_wr send_wr, *send_wr_failed;
1053 int ret;
1054
1055 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1056 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1057
1058 send_wr.next = NULL;
1059 send_wr.wr_id = (uintptr_t)tx_desc;
1060 send_wr.sg_list = tx_desc->tx_sg;
1061 send_wr.num_sge = tx_desc->num_sge;
1062 send_wr.opcode = IB_WR_SEND;
1063 send_wr.send_flags = IB_SEND_SIGNALED;
1064
1065 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1066 if (ret)
1067 isert_err("ib_post_send() failed, ret: %d\n", ret);
1068
1069 return ret;
1070 }
1071
1072 static void
1073 isert_create_send_desc(struct isert_conn *isert_conn,
1074 struct isert_cmd *isert_cmd,
1075 struct iser_tx_desc *tx_desc)
1076 {
1077 struct isert_device *device = isert_conn->device;
1078 struct ib_device *ib_dev = device->ib_device;
1079
1080 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1081 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1082
1083 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
1084 tx_desc->iser_header.flags = ISER_VER;
1085
1086 tx_desc->num_sge = 1;
1087 tx_desc->isert_cmd = isert_cmd;
1088
1089 if (tx_desc->tx_sg[0].lkey != device->mr->lkey) {
1090 tx_desc->tx_sg[0].lkey = device->mr->lkey;
1091 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1092 }
1093 }
1094
1095 static int
1096 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1097 struct iser_tx_desc *tx_desc)
1098 {
1099 struct isert_device *device = isert_conn->device;
1100 struct ib_device *ib_dev = device->ib_device;
1101 u64 dma_addr;
1102
1103 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1104 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1105 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1106 isert_err("ib_dma_mapping_error() failed\n");
1107 return -ENOMEM;
1108 }
1109
1110 tx_desc->dma_addr = dma_addr;
1111 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1112 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1113 tx_desc->tx_sg[0].lkey = device->mr->lkey;
1114
1115 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1116 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1117 tx_desc->tx_sg[0].lkey);
1118
1119 return 0;
1120 }
1121
1122 static void
1123 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1124 struct ib_send_wr *send_wr)
1125 {
1126 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1127
1128 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1129 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1130 send_wr->opcode = IB_WR_SEND;
1131 send_wr->sg_list = &tx_desc->tx_sg[0];
1132 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1133 send_wr->send_flags = IB_SEND_SIGNALED;
1134 }
1135
1136 static int
1137 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1138 {
1139 struct ib_recv_wr rx_wr, *rx_wr_fail;
1140 struct ib_sge sge;
1141 int ret;
1142
1143 memset(&sge, 0, sizeof(struct ib_sge));
1144 sge.addr = isert_conn->login_req_dma;
1145 sge.length = ISER_RX_LOGIN_SIZE;
1146 sge.lkey = isert_conn->device->mr->lkey;
1147
1148 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1149 sge.addr, sge.length, sge.lkey);
1150
1151 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1152 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1153 rx_wr.sg_list = &sge;
1154 rx_wr.num_sge = 1;
1155
1156 isert_conn->post_recv_buf_count++;
1157 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1158 if (ret) {
1159 isert_err("ib_post_recv() failed: %d\n", ret);
1160 isert_conn->post_recv_buf_count--;
1161 }
1162
1163 return ret;
1164 }
1165
1166 static int
1167 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1168 u32 length)
1169 {
1170 struct isert_conn *isert_conn = conn->context;
1171 struct isert_device *device = isert_conn->device;
1172 struct ib_device *ib_dev = device->ib_device;
1173 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1174 int ret;
1175
1176 isert_create_send_desc(isert_conn, NULL, tx_desc);
1177
1178 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1179 sizeof(struct iscsi_hdr));
1180
1181 isert_init_tx_hdrs(isert_conn, tx_desc);
1182
1183 if (length > 0) {
1184 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1185
1186 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1187 length, DMA_TO_DEVICE);
1188
1189 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1190
1191 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1192 length, DMA_TO_DEVICE);
1193
1194 tx_dsg->addr = isert_conn->login_rsp_dma;
1195 tx_dsg->length = length;
1196 tx_dsg->lkey = isert_conn->device->mr->lkey;
1197 tx_desc->num_sge = 2;
1198 }
1199 if (!login->login_failed) {
1200 if (login->login_complete) {
1201 if (!conn->sess->sess_ops->SessionType &&
1202 isert_conn->device->use_fastreg) {
1203 ret = isert_conn_create_fastreg_pool(isert_conn);
1204 if (ret) {
1205 isert_err("Conn: %p failed to create"
1206 " fastreg pool\n", isert_conn);
1207 return ret;
1208 }
1209 }
1210
1211 ret = isert_alloc_rx_descriptors(isert_conn);
1212 if (ret)
1213 return ret;
1214
1215 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1216 if (ret)
1217 return ret;
1218
1219 /* Now we are in FULL_FEATURE phase */
1220 mutex_lock(&isert_conn->mutex);
1221 isert_conn->state = ISER_CONN_FULL_FEATURE;
1222 mutex_unlock(&isert_conn->mutex);
1223 goto post_send;
1224 }
1225
1226 ret = isert_rdma_post_recvl(isert_conn);
1227 if (ret)
1228 return ret;
1229 }
1230 post_send:
1231 ret = isert_post_send(isert_conn, tx_desc);
1232 if (ret)
1233 return ret;
1234
1235 return 0;
1236 }
1237
1238 static void
1239 isert_rx_login_req(struct isert_conn *isert_conn)
1240 {
1241 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1242 int rx_buflen = isert_conn->login_req_len;
1243 struct iscsi_conn *conn = isert_conn->conn;
1244 struct iscsi_login *login = conn->conn_login;
1245 int size;
1246
1247 isert_info("conn %p\n", isert_conn);
1248
1249 WARN_ON_ONCE(!login);
1250
1251 if (login->first_request) {
1252 struct iscsi_login_req *login_req =
1253 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1254 /*
1255 * Setup the initial iscsi_login values from the leading
1256 * login request PDU.
1257 */
1258 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1259 login->current_stage =
1260 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1261 >> 2;
1262 login->version_min = login_req->min_version;
1263 login->version_max = login_req->max_version;
1264 memcpy(login->isid, login_req->isid, 6);
1265 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1266 login->init_task_tag = login_req->itt;
1267 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1268 login->cid = be16_to_cpu(login_req->cid);
1269 login->tsih = be16_to_cpu(login_req->tsih);
1270 }
1271
1272 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1273
1274 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1275 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1276 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1277 MAX_KEY_VALUE_PAIRS);
1278 memcpy(login->req_buf, &rx_desc->data[0], size);
1279
1280 if (login->first_request) {
1281 complete(&isert_conn->login_comp);
1282 return;
1283 }
1284 schedule_delayed_work(&conn->login_work, 0);
1285 }
1286
1287 static struct iscsi_cmd
1288 *isert_allocate_cmd(struct iscsi_conn *conn)
1289 {
1290 struct isert_conn *isert_conn = conn->context;
1291 struct isert_cmd *isert_cmd;
1292 struct iscsi_cmd *cmd;
1293
1294 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1295 if (!cmd) {
1296 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1297 return NULL;
1298 }
1299 isert_cmd = iscsit_priv_cmd(cmd);
1300 isert_cmd->conn = isert_conn;
1301 isert_cmd->iscsi_cmd = cmd;
1302
1303 return cmd;
1304 }
1305
1306 static int
1307 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1308 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1309 struct iser_rx_desc *rx_desc, unsigned char *buf)
1310 {
1311 struct iscsi_conn *conn = isert_conn->conn;
1312 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1313 struct scatterlist *sg;
1314 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1315 bool dump_payload = false;
1316
1317 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1318 if (rc < 0)
1319 return rc;
1320
1321 imm_data = cmd->immediate_data;
1322 imm_data_len = cmd->first_burst_len;
1323 unsol_data = cmd->unsolicited_data;
1324
1325 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1326 if (rc < 0) {
1327 return 0;
1328 } else if (rc > 0) {
1329 dump_payload = true;
1330 goto sequence_cmd;
1331 }
1332
1333 if (!imm_data)
1334 return 0;
1335
1336 sg = &cmd->se_cmd.t_data_sg[0];
1337 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1338
1339 isert_dbg("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1340 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1341
1342 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1343
1344 cmd->write_data_done += imm_data_len;
1345
1346 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1347 spin_lock_bh(&cmd->istate_lock);
1348 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1349 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1350 spin_unlock_bh(&cmd->istate_lock);
1351 }
1352
1353 sequence_cmd:
1354 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1355
1356 if (!rc && dump_payload == false && unsol_data)
1357 iscsit_set_unsoliticed_dataout(cmd);
1358 else if (dump_payload && imm_data)
1359 target_put_sess_cmd(&cmd->se_cmd);
1360
1361 return 0;
1362 }
1363
1364 static int
1365 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1366 struct iser_rx_desc *rx_desc, unsigned char *buf)
1367 {
1368 struct scatterlist *sg_start;
1369 struct iscsi_conn *conn = isert_conn->conn;
1370 struct iscsi_cmd *cmd = NULL;
1371 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1372 u32 unsol_data_len = ntoh24(hdr->dlength);
1373 int rc, sg_nents, sg_off, page_off;
1374
1375 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1376 if (rc < 0)
1377 return rc;
1378 else if (!cmd)
1379 return 0;
1380 /*
1381 * FIXME: Unexpected unsolicited_data out
1382 */
1383 if (!cmd->unsolicited_data) {
1384 isert_err("Received unexpected solicited data payload\n");
1385 dump_stack();
1386 return -1;
1387 }
1388
1389 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1390 "write_data_done: %u, data_length: %u\n",
1391 unsol_data_len, cmd->write_data_done,
1392 cmd->se_cmd.data_length);
1393
1394 sg_off = cmd->write_data_done / PAGE_SIZE;
1395 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1396 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1397 page_off = cmd->write_data_done % PAGE_SIZE;
1398 /*
1399 * FIXME: Non page-aligned unsolicited_data out
1400 */
1401 if (page_off) {
1402 isert_err("unexpected non-page aligned data payload\n");
1403 dump_stack();
1404 return -1;
1405 }
1406 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1407 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1408 sg_nents, &rx_desc->data[0], unsol_data_len);
1409
1410 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1411 unsol_data_len);
1412
1413 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1414 if (rc < 0)
1415 return rc;
1416
1417 return 0;
1418 }
1419
1420 static int
1421 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1422 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1423 unsigned char *buf)
1424 {
1425 struct iscsi_conn *conn = isert_conn->conn;
1426 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1427 int rc;
1428
1429 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1430 if (rc < 0)
1431 return rc;
1432 /*
1433 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1434 */
1435
1436 return iscsit_process_nop_out(conn, cmd, hdr);
1437 }
1438
1439 static int
1440 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1441 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1442 struct iscsi_text *hdr)
1443 {
1444 struct iscsi_conn *conn = isert_conn->conn;
1445 u32 payload_length = ntoh24(hdr->dlength);
1446 int rc;
1447 unsigned char *text_in = NULL;
1448
1449 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1450 if (rc < 0)
1451 return rc;
1452
1453 if (payload_length) {
1454 text_in = kzalloc(payload_length, GFP_KERNEL);
1455 if (!text_in) {
1456 isert_err("Unable to allocate text_in of payload_length: %u\n",
1457 payload_length);
1458 return -ENOMEM;
1459 }
1460 }
1461 cmd->text_in_ptr = text_in;
1462
1463 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1464
1465 return iscsit_process_text_cmd(conn, cmd, hdr);
1466 }
1467
1468 static int
1469 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1470 uint32_t read_stag, uint64_t read_va,
1471 uint32_t write_stag, uint64_t write_va)
1472 {
1473 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1474 struct iscsi_conn *conn = isert_conn->conn;
1475 struct iscsi_cmd *cmd;
1476 struct isert_cmd *isert_cmd;
1477 int ret = -EINVAL;
1478 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1479
1480 if (conn->sess->sess_ops->SessionType &&
1481 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1482 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1483 " ignoring\n", opcode);
1484 return 0;
1485 }
1486
1487 switch (opcode) {
1488 case ISCSI_OP_SCSI_CMD:
1489 cmd = isert_allocate_cmd(conn);
1490 if (!cmd)
1491 break;
1492
1493 isert_cmd = iscsit_priv_cmd(cmd);
1494 isert_cmd->read_stag = read_stag;
1495 isert_cmd->read_va = read_va;
1496 isert_cmd->write_stag = write_stag;
1497 isert_cmd->write_va = write_va;
1498
1499 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1500 rx_desc, (unsigned char *)hdr);
1501 break;
1502 case ISCSI_OP_NOOP_OUT:
1503 cmd = isert_allocate_cmd(conn);
1504 if (!cmd)
1505 break;
1506
1507 isert_cmd = iscsit_priv_cmd(cmd);
1508 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1509 rx_desc, (unsigned char *)hdr);
1510 break;
1511 case ISCSI_OP_SCSI_DATA_OUT:
1512 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1513 (unsigned char *)hdr);
1514 break;
1515 case ISCSI_OP_SCSI_TMFUNC:
1516 cmd = isert_allocate_cmd(conn);
1517 if (!cmd)
1518 break;
1519
1520 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1521 (unsigned char *)hdr);
1522 break;
1523 case ISCSI_OP_LOGOUT:
1524 cmd = isert_allocate_cmd(conn);
1525 if (!cmd)
1526 break;
1527
1528 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1529 break;
1530 case ISCSI_OP_TEXT:
1531 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF) {
1532 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1533 if (!cmd)
1534 break;
1535 } else {
1536 cmd = isert_allocate_cmd(conn);
1537 if (!cmd)
1538 break;
1539 }
1540
1541 isert_cmd = iscsit_priv_cmd(cmd);
1542 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1543 rx_desc, (struct iscsi_text *)hdr);
1544 break;
1545 default:
1546 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1547 dump_stack();
1548 break;
1549 }
1550
1551 return ret;
1552 }
1553
1554 static void
1555 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1556 {
1557 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1558 uint64_t read_va = 0, write_va = 0;
1559 uint32_t read_stag = 0, write_stag = 0;
1560 int rc;
1561
1562 switch (iser_hdr->flags & 0xF0) {
1563 case ISCSI_CTRL:
1564 if (iser_hdr->flags & ISER_RSV) {
1565 read_stag = be32_to_cpu(iser_hdr->read_stag);
1566 read_va = be64_to_cpu(iser_hdr->read_va);
1567 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1568 read_stag, (unsigned long long)read_va);
1569 }
1570 if (iser_hdr->flags & ISER_WSV) {
1571 write_stag = be32_to_cpu(iser_hdr->write_stag);
1572 write_va = be64_to_cpu(iser_hdr->write_va);
1573 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1574 write_stag, (unsigned long long)write_va);
1575 }
1576
1577 isert_dbg("ISER ISCSI_CTRL PDU\n");
1578 break;
1579 case ISER_HELLO:
1580 isert_err("iSER Hello message\n");
1581 break;
1582 default:
1583 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1584 break;
1585 }
1586
1587 rc = isert_rx_opcode(isert_conn, rx_desc,
1588 read_stag, read_va, write_stag, write_va);
1589 }
1590
1591 static void
1592 isert_rcv_completion(struct iser_rx_desc *desc,
1593 struct isert_conn *isert_conn,
1594 u32 xfer_len)
1595 {
1596 struct ib_device *ib_dev = isert_conn->cm_id->device;
1597 struct iscsi_hdr *hdr;
1598 u64 rx_dma;
1599 int rx_buflen, outstanding;
1600
1601 if ((char *)desc == isert_conn->login_req_buf) {
1602 rx_dma = isert_conn->login_req_dma;
1603 rx_buflen = ISER_RX_LOGIN_SIZE;
1604 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1605 rx_dma, rx_buflen);
1606 } else {
1607 rx_dma = desc->dma_addr;
1608 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1609 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1610 rx_dma, rx_buflen);
1611 }
1612
1613 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1614
1615 hdr = &desc->iscsi_header;
1616 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1617 hdr->opcode, hdr->itt, hdr->flags,
1618 (int)(xfer_len - ISER_HEADERS_LEN));
1619
1620 if ((char *)desc == isert_conn->login_req_buf) {
1621 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1622 if (isert_conn->conn) {
1623 struct iscsi_login *login = isert_conn->conn->conn_login;
1624
1625 if (login && !login->first_request)
1626 isert_rx_login_req(isert_conn);
1627 }
1628 mutex_lock(&isert_conn->mutex);
1629 complete(&isert_conn->login_req_comp);
1630 mutex_unlock(&isert_conn->mutex);
1631 } else {
1632 isert_rx_do_work(desc, isert_conn);
1633 }
1634
1635 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1636 DMA_FROM_DEVICE);
1637
1638 isert_conn->post_recv_buf_count--;
1639 isert_dbg("Decremented post_recv_buf_count: %d\n",
1640 isert_conn->post_recv_buf_count);
1641
1642 if ((char *)desc == isert_conn->login_req_buf)
1643 return;
1644
1645 outstanding = isert_conn->post_recv_buf_count;
1646 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1647 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1648 ISERT_MIN_POSTED_RX);
1649 err = isert_post_recv(isert_conn, count);
1650 if (err) {
1651 isert_err("isert_post_recv() count: %d failed, %d\n",
1652 count, err);
1653 }
1654 }
1655 }
1656
1657 static int
1658 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1659 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1660 enum iser_ib_op_code op, struct isert_data_buf *data)
1661 {
1662 struct ib_device *ib_dev = isert_conn->cm_id->device;
1663
1664 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1665 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1666
1667 data->len = length - offset;
1668 data->offset = offset;
1669 data->sg_off = data->offset / PAGE_SIZE;
1670
1671 data->sg = &sg[data->sg_off];
1672 data->nents = min_t(unsigned int, nents - data->sg_off,
1673 ISCSI_ISER_SG_TABLESIZE);
1674 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1675 PAGE_SIZE);
1676
1677 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1678 data->dma_dir);
1679 if (unlikely(!data->dma_nents)) {
1680 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1681 return -EINVAL;
1682 }
1683
1684 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1685 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1686
1687 return 0;
1688 }
1689
1690 static void
1691 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1692 {
1693 struct ib_device *ib_dev = isert_conn->cm_id->device;
1694
1695 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1696 memset(data, 0, sizeof(*data));
1697 }
1698
1699
1700
1701 static void
1702 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1703 {
1704 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1705
1706 isert_dbg("Cmd %p\n", isert_cmd);
1707
1708 if (wr->data.sg) {
1709 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1710 isert_unmap_data_buf(isert_conn, &wr->data);
1711 }
1712
1713 if (wr->send_wr) {
1714 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1715 kfree(wr->send_wr);
1716 wr->send_wr = NULL;
1717 }
1718
1719 if (wr->ib_sge) {
1720 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1721 kfree(wr->ib_sge);
1722 wr->ib_sge = NULL;
1723 }
1724 }
1725
1726 static void
1727 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1728 {
1729 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1730
1731 isert_dbg("Cmd %p\n", isert_cmd);
1732
1733 if (wr->fr_desc) {
1734 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1735 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1736 isert_unmap_data_buf(isert_conn, &wr->prot);
1737 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1738 }
1739 spin_lock_bh(&isert_conn->pool_lock);
1740 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1741 spin_unlock_bh(&isert_conn->pool_lock);
1742 wr->fr_desc = NULL;
1743 }
1744
1745 if (wr->data.sg) {
1746 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1747 isert_unmap_data_buf(isert_conn, &wr->data);
1748 }
1749
1750 wr->ib_sge = NULL;
1751 wr->send_wr = NULL;
1752 }
1753
1754 static void
1755 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1756 {
1757 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1758 struct isert_conn *isert_conn = isert_cmd->conn;
1759 struct iscsi_conn *conn = isert_conn->conn;
1760 struct isert_device *device = isert_conn->device;
1761 struct iscsi_text_rsp *hdr;
1762
1763 isert_dbg("Cmd %p\n", isert_cmd);
1764
1765 switch (cmd->iscsi_opcode) {
1766 case ISCSI_OP_SCSI_CMD:
1767 spin_lock_bh(&conn->cmd_lock);
1768 if (!list_empty(&cmd->i_conn_node))
1769 list_del_init(&cmd->i_conn_node);
1770 spin_unlock_bh(&conn->cmd_lock);
1771
1772 if (cmd->data_direction == DMA_TO_DEVICE) {
1773 iscsit_stop_dataout_timer(cmd);
1774 /*
1775 * Check for special case during comp_err where
1776 * WRITE_PENDING has been handed off from core,
1777 * but requires an extra target_put_sess_cmd()
1778 * before transport_generic_free_cmd() below.
1779 */
1780 if (comp_err &&
1781 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1782 struct se_cmd *se_cmd = &cmd->se_cmd;
1783
1784 target_put_sess_cmd(se_cmd);
1785 }
1786 }
1787
1788 device->unreg_rdma_mem(isert_cmd, isert_conn);
1789 transport_generic_free_cmd(&cmd->se_cmd, 0);
1790 break;
1791 case ISCSI_OP_SCSI_TMFUNC:
1792 spin_lock_bh(&conn->cmd_lock);
1793 if (!list_empty(&cmd->i_conn_node))
1794 list_del_init(&cmd->i_conn_node);
1795 spin_unlock_bh(&conn->cmd_lock);
1796
1797 transport_generic_free_cmd(&cmd->se_cmd, 0);
1798 break;
1799 case ISCSI_OP_REJECT:
1800 case ISCSI_OP_NOOP_OUT:
1801 case ISCSI_OP_TEXT:
1802 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1803 /* If the continue bit is on, keep the command alive */
1804 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1805 break;
1806
1807 spin_lock_bh(&conn->cmd_lock);
1808 if (!list_empty(&cmd->i_conn_node))
1809 list_del_init(&cmd->i_conn_node);
1810 spin_unlock_bh(&conn->cmd_lock);
1811
1812 /*
1813 * Handle special case for REJECT when iscsi_add_reject*() has
1814 * overwritten the original iscsi_opcode assignment, and the
1815 * associated cmd->se_cmd needs to be released.
1816 */
1817 if (cmd->se_cmd.se_tfo != NULL) {
1818 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1819 cmd->iscsi_opcode);
1820 transport_generic_free_cmd(&cmd->se_cmd, 0);
1821 break;
1822 }
1823 /*
1824 * Fall-through
1825 */
1826 default:
1827 iscsit_release_cmd(cmd);
1828 break;
1829 }
1830 }
1831
1832 static void
1833 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1834 {
1835 if (tx_desc->dma_addr != 0) {
1836 isert_dbg("unmap single for tx_desc->dma_addr\n");
1837 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1838 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1839 tx_desc->dma_addr = 0;
1840 }
1841 }
1842
1843 static void
1844 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1845 struct ib_device *ib_dev, bool comp_err)
1846 {
1847 if (isert_cmd->pdu_buf_dma != 0) {
1848 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1849 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1850 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1851 isert_cmd->pdu_buf_dma = 0;
1852 }
1853
1854 isert_unmap_tx_desc(tx_desc, ib_dev);
1855 isert_put_cmd(isert_cmd, comp_err);
1856 }
1857
1858 static int
1859 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1860 {
1861 struct ib_mr_status mr_status;
1862 int ret;
1863
1864 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1865 if (ret) {
1866 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1867 goto fail_mr_status;
1868 }
1869
1870 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1871 u64 sec_offset_err;
1872 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1873
1874 switch (mr_status.sig_err.err_type) {
1875 case IB_SIG_BAD_GUARD:
1876 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1877 break;
1878 case IB_SIG_BAD_REFTAG:
1879 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1880 break;
1881 case IB_SIG_BAD_APPTAG:
1882 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1883 break;
1884 }
1885 sec_offset_err = mr_status.sig_err.sig_err_offset;
1886 do_div(sec_offset_err, block_size);
1887 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1888
1889 isert_err("PI error found type %d at sector 0x%llx "
1890 "expected 0x%x vs actual 0x%x\n",
1891 mr_status.sig_err.err_type,
1892 (unsigned long long)se_cmd->bad_sector,
1893 mr_status.sig_err.expected,
1894 mr_status.sig_err.actual);
1895 ret = 1;
1896 }
1897
1898 fail_mr_status:
1899 return ret;
1900 }
1901
1902 static void
1903 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1904 struct isert_cmd *isert_cmd)
1905 {
1906 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1907 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1908 struct se_cmd *se_cmd = &cmd->se_cmd;
1909 struct isert_conn *isert_conn = isert_cmd->conn;
1910 struct isert_device *device = isert_conn->device;
1911 int ret = 0;
1912
1913 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1914 ret = isert_check_pi_status(se_cmd,
1915 wr->fr_desc->pi_ctx->sig_mr);
1916 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1917 }
1918
1919 device->unreg_rdma_mem(isert_cmd, isert_conn);
1920 wr->send_wr_num = 0;
1921 if (ret)
1922 transport_send_check_condition_and_sense(se_cmd,
1923 se_cmd->pi_err, 0);
1924 else
1925 isert_put_response(isert_conn->conn, cmd);
1926 }
1927
1928 static void
1929 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1930 struct isert_cmd *isert_cmd)
1931 {
1932 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1933 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1934 struct se_cmd *se_cmd = &cmd->se_cmd;
1935 struct isert_conn *isert_conn = isert_cmd->conn;
1936 struct isert_device *device = isert_conn->device;
1937 int ret = 0;
1938
1939 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1940 ret = isert_check_pi_status(se_cmd,
1941 wr->fr_desc->pi_ctx->sig_mr);
1942 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1943 }
1944
1945 iscsit_stop_dataout_timer(cmd);
1946 device->unreg_rdma_mem(isert_cmd, isert_conn);
1947 cmd->write_data_done = wr->data.len;
1948 wr->send_wr_num = 0;
1949
1950 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1951 spin_lock_bh(&cmd->istate_lock);
1952 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1953 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1954 spin_unlock_bh(&cmd->istate_lock);
1955
1956 if (ret) {
1957 target_put_sess_cmd(se_cmd);
1958 transport_send_check_condition_and_sense(se_cmd,
1959 se_cmd->pi_err, 0);
1960 } else {
1961 target_execute_cmd(se_cmd);
1962 }
1963 }
1964
1965 static void
1966 isert_do_control_comp(struct work_struct *work)
1967 {
1968 struct isert_cmd *isert_cmd = container_of(work,
1969 struct isert_cmd, comp_work);
1970 struct isert_conn *isert_conn = isert_cmd->conn;
1971 struct ib_device *ib_dev = isert_conn->cm_id->device;
1972 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1973
1974 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1975
1976 switch (cmd->i_state) {
1977 case ISTATE_SEND_TASKMGTRSP:
1978 iscsit_tmr_post_handler(cmd, cmd->conn);
1979 case ISTATE_SEND_REJECT: /* FALLTHRU */
1980 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1981 cmd->i_state = ISTATE_SENT_STATUS;
1982 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1983 ib_dev, false);
1984 break;
1985 case ISTATE_SEND_LOGOUTRSP:
1986 iscsit_logout_post_handler(cmd, cmd->conn);
1987 break;
1988 default:
1989 isert_err("Unknown i_state %d\n", cmd->i_state);
1990 dump_stack();
1991 break;
1992 }
1993 }
1994
1995 static void
1996 isert_response_completion(struct iser_tx_desc *tx_desc,
1997 struct isert_cmd *isert_cmd,
1998 struct isert_conn *isert_conn,
1999 struct ib_device *ib_dev)
2000 {
2001 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2002
2003 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
2004 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
2005 cmd->i_state == ISTATE_SEND_REJECT ||
2006 cmd->i_state == ISTATE_SEND_TEXTRSP) {
2007 isert_unmap_tx_desc(tx_desc, ib_dev);
2008
2009 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2010 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2011 return;
2012 }
2013
2014 cmd->i_state = ISTATE_SENT_STATUS;
2015 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2016 }
2017
2018 static void
2019 isert_snd_completion(struct iser_tx_desc *tx_desc,
2020 struct isert_conn *isert_conn)
2021 {
2022 struct ib_device *ib_dev = isert_conn->cm_id->device;
2023 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2024 struct isert_rdma_wr *wr;
2025
2026 if (!isert_cmd) {
2027 isert_unmap_tx_desc(tx_desc, ib_dev);
2028 return;
2029 }
2030 wr = &isert_cmd->rdma_wr;
2031
2032 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2033
2034 switch (wr->iser_ib_op) {
2035 case ISER_IB_SEND:
2036 isert_response_completion(tx_desc, isert_cmd,
2037 isert_conn, ib_dev);
2038 break;
2039 case ISER_IB_RDMA_WRITE:
2040 isert_completion_rdma_write(tx_desc, isert_cmd);
2041 break;
2042 case ISER_IB_RDMA_READ:
2043 isert_completion_rdma_read(tx_desc, isert_cmd);
2044 break;
2045 default:
2046 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2047 dump_stack();
2048 break;
2049 }
2050 }
2051
2052 /**
2053 * is_isert_tx_desc() - Indicate if the completion wr_id
2054 * is a TX descriptor or not.
2055 * @isert_conn: iser connection
2056 * @wr_id: completion WR identifier
2057 *
2058 * Since we cannot rely on wc opcode in FLUSH errors
2059 * we must work around it by checking if the wr_id address
2060 * falls in the iser connection rx_descs buffer. If so
2061 * it is an RX descriptor, otherwize it is a TX.
2062 */
2063 static inline bool
2064 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2065 {
2066 void *start = isert_conn->rx_descs;
2067 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2068
2069 if (wr_id >= start && wr_id < start + len)
2070 return false;
2071
2072 return true;
2073 }
2074
2075 static void
2076 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2077 {
2078 if (wc->wr_id == ISER_BEACON_WRID) {
2079 isert_info("conn %p completing wait_comp_err\n",
2080 isert_conn);
2081 complete(&isert_conn->wait_comp_err);
2082 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2083 struct ib_device *ib_dev = isert_conn->cm_id->device;
2084 struct isert_cmd *isert_cmd;
2085 struct iser_tx_desc *desc;
2086
2087 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2088 isert_cmd = desc->isert_cmd;
2089 if (!isert_cmd)
2090 isert_unmap_tx_desc(desc, ib_dev);
2091 else
2092 isert_completion_put(desc, isert_cmd, ib_dev, true);
2093 } else {
2094 isert_conn->post_recv_buf_count--;
2095 if (!isert_conn->post_recv_buf_count)
2096 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2097 }
2098 }
2099
2100 static void
2101 isert_handle_wc(struct ib_wc *wc)
2102 {
2103 struct isert_conn *isert_conn;
2104 struct iser_tx_desc *tx_desc;
2105 struct iser_rx_desc *rx_desc;
2106
2107 isert_conn = wc->qp->qp_context;
2108 if (likely(wc->status == IB_WC_SUCCESS)) {
2109 if (wc->opcode == IB_WC_RECV) {
2110 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2111 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2112 } else {
2113 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2114 isert_snd_completion(tx_desc, isert_conn);
2115 }
2116 } else {
2117 if (wc->status != IB_WC_WR_FLUSH_ERR)
2118 isert_err("%s (%d): wr id %llx vend_err %x\n",
2119 ib_wc_status_msg(wc->status), wc->status,
2120 wc->wr_id, wc->vendor_err);
2121 else
2122 isert_dbg("%s (%d): wr id %llx\n",
2123 ib_wc_status_msg(wc->status), wc->status,
2124 wc->wr_id);
2125
2126 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2127 isert_cq_comp_err(isert_conn, wc);
2128 }
2129 }
2130
2131 static void
2132 isert_cq_work(struct work_struct *work)
2133 {
2134 enum { isert_poll_budget = 65536 };
2135 struct isert_comp *comp = container_of(work, struct isert_comp,
2136 work);
2137 struct ib_wc *const wcs = comp->wcs;
2138 int i, n, completed = 0;
2139
2140 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2141 for (i = 0; i < n; i++)
2142 isert_handle_wc(&wcs[i]);
2143
2144 completed += n;
2145 if (completed >= isert_poll_budget)
2146 break;
2147 }
2148
2149 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2150 }
2151
2152 static void
2153 isert_cq_callback(struct ib_cq *cq, void *context)
2154 {
2155 struct isert_comp *comp = context;
2156
2157 queue_work(isert_comp_wq, &comp->work);
2158 }
2159
2160 static int
2161 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2162 {
2163 struct ib_send_wr *wr_failed;
2164 int ret;
2165
2166 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2167 &wr_failed);
2168 if (ret) {
2169 isert_err("ib_post_send failed with %d\n", ret);
2170 return ret;
2171 }
2172 return ret;
2173 }
2174
2175 static int
2176 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2177 {
2178 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2179 struct isert_conn *isert_conn = conn->context;
2180 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2181 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2182 &isert_cmd->tx_desc.iscsi_header;
2183
2184 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2185 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2186 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2187 /*
2188 * Attach SENSE DATA payload to iSCSI Response PDU
2189 */
2190 if (cmd->se_cmd.sense_buffer &&
2191 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2192 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2193 struct isert_device *device = isert_conn->device;
2194 struct ib_device *ib_dev = device->ib_device;
2195 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2196 u32 padding, pdu_len;
2197
2198 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2199 cmd->sense_buffer);
2200 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2201
2202 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2203 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2204 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2205
2206 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2207 (void *)cmd->sense_buffer, pdu_len,
2208 DMA_TO_DEVICE);
2209
2210 isert_cmd->pdu_buf_len = pdu_len;
2211 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2212 tx_dsg->length = pdu_len;
2213 tx_dsg->lkey = device->mr->lkey;
2214 isert_cmd->tx_desc.num_sge = 2;
2215 }
2216
2217 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2218
2219 isert_dbg("Posting SCSI Response\n");
2220
2221 return isert_post_response(isert_conn, isert_cmd);
2222 }
2223
2224 static void
2225 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2226 {
2227 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2228 struct isert_conn *isert_conn = conn->context;
2229 struct isert_device *device = isert_conn->device;
2230
2231 spin_lock_bh(&conn->cmd_lock);
2232 if (!list_empty(&cmd->i_conn_node))
2233 list_del_init(&cmd->i_conn_node);
2234 spin_unlock_bh(&conn->cmd_lock);
2235
2236 if (cmd->data_direction == DMA_TO_DEVICE)
2237 iscsit_stop_dataout_timer(cmd);
2238
2239 device->unreg_rdma_mem(isert_cmd, isert_conn);
2240 }
2241
2242 static enum target_prot_op
2243 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2244 {
2245 struct isert_conn *isert_conn = conn->context;
2246 struct isert_device *device = isert_conn->device;
2247
2248 if (conn->tpg->tpg_attrib.t10_pi) {
2249 if (device->pi_capable) {
2250 isert_info("conn %p PI offload enabled\n", isert_conn);
2251 isert_conn->pi_support = true;
2252 return TARGET_PROT_ALL;
2253 }
2254 }
2255
2256 isert_info("conn %p PI offload disabled\n", isert_conn);
2257 isert_conn->pi_support = false;
2258
2259 return TARGET_PROT_NORMAL;
2260 }
2261
2262 static int
2263 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2264 bool nopout_response)
2265 {
2266 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2267 struct isert_conn *isert_conn = conn->context;
2268 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2269
2270 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2271 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2272 &isert_cmd->tx_desc.iscsi_header,
2273 nopout_response);
2274 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2275 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2276
2277 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2278
2279 return isert_post_response(isert_conn, isert_cmd);
2280 }
2281
2282 static int
2283 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2284 {
2285 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2286 struct isert_conn *isert_conn = conn->context;
2287 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2288
2289 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2290 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2291 &isert_cmd->tx_desc.iscsi_header);
2292 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2293 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2294
2295 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2296
2297 return isert_post_response(isert_conn, isert_cmd);
2298 }
2299
2300 static int
2301 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2302 {
2303 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2304 struct isert_conn *isert_conn = conn->context;
2305 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2306
2307 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2308 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2309 &isert_cmd->tx_desc.iscsi_header);
2310 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2311 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2312
2313 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2314
2315 return isert_post_response(isert_conn, isert_cmd);
2316 }
2317
2318 static int
2319 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2320 {
2321 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2322 struct isert_conn *isert_conn = conn->context;
2323 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2324 struct isert_device *device = isert_conn->device;
2325 struct ib_device *ib_dev = device->ib_device;
2326 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2327 struct iscsi_reject *hdr =
2328 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2329
2330 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2331 iscsit_build_reject(cmd, conn, hdr);
2332 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2333
2334 hton24(hdr->dlength, ISCSI_HDR_LEN);
2335 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2336 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2337 DMA_TO_DEVICE);
2338 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2339 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2340 tx_dsg->length = ISCSI_HDR_LEN;
2341 tx_dsg->lkey = device->mr->lkey;
2342 isert_cmd->tx_desc.num_sge = 2;
2343
2344 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2345
2346 isert_dbg("conn %p Posting Reject\n", isert_conn);
2347
2348 return isert_post_response(isert_conn, isert_cmd);
2349 }
2350
2351 static int
2352 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2353 {
2354 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2355 struct isert_conn *isert_conn = conn->context;
2356 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2357 struct iscsi_text_rsp *hdr =
2358 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2359 u32 txt_rsp_len;
2360 int rc;
2361
2362 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2363 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2364 if (rc < 0)
2365 return rc;
2366
2367 txt_rsp_len = rc;
2368 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2369
2370 if (txt_rsp_len) {
2371 struct isert_device *device = isert_conn->device;
2372 struct ib_device *ib_dev = device->ib_device;
2373 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2374 void *txt_rsp_buf = cmd->buf_ptr;
2375
2376 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2377 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2378
2379 isert_cmd->pdu_buf_len = txt_rsp_len;
2380 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2381 tx_dsg->length = txt_rsp_len;
2382 tx_dsg->lkey = device->mr->lkey;
2383 isert_cmd->tx_desc.num_sge = 2;
2384 }
2385 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2386
2387 isert_dbg("conn %p Text Response\n", isert_conn);
2388
2389 return isert_post_response(isert_conn, isert_cmd);
2390 }
2391
2392 static int
2393 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2394 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2395 u32 data_left, u32 offset)
2396 {
2397 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2398 struct scatterlist *sg_start, *tmp_sg;
2399 struct isert_device *device = isert_conn->device;
2400 struct ib_device *ib_dev = device->ib_device;
2401 u32 sg_off, page_off;
2402 int i = 0, sg_nents;
2403
2404 sg_off = offset / PAGE_SIZE;
2405 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2406 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2407 page_off = offset % PAGE_SIZE;
2408
2409 send_wr->sg_list = ib_sge;
2410 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2411 /*
2412 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2413 */
2414 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2415 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2416 "page_off: %u\n",
2417 (unsigned long long)tmp_sg->dma_address,
2418 tmp_sg->length, page_off);
2419
2420 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2421 ib_sge->length = min_t(u32, data_left,
2422 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2423 ib_sge->lkey = device->mr->lkey;
2424
2425 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2426 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2427 page_off = 0;
2428 data_left -= ib_sge->length;
2429 if (!data_left)
2430 break;
2431 ib_sge++;
2432 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2433 }
2434
2435 send_wr->num_sge = ++i;
2436 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2437 send_wr->sg_list, send_wr->num_sge);
2438
2439 return send_wr->num_sge;
2440 }
2441
2442 static int
2443 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2444 struct isert_rdma_wr *wr)
2445 {
2446 struct se_cmd *se_cmd = &cmd->se_cmd;
2447 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2448 struct isert_conn *isert_conn = conn->context;
2449 struct isert_data_buf *data = &wr->data;
2450 struct ib_send_wr *send_wr;
2451 struct ib_sge *ib_sge;
2452 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2453 int ret = 0, i, ib_sge_cnt;
2454
2455 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2456
2457 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2458 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2459 se_cmd->t_data_nents, se_cmd->data_length,
2460 offset, wr->iser_ib_op, &wr->data);
2461 if (ret)
2462 return ret;
2463
2464 data_left = data->len;
2465 offset = data->offset;
2466
2467 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2468 if (!ib_sge) {
2469 isert_warn("Unable to allocate ib_sge\n");
2470 ret = -ENOMEM;
2471 goto unmap_cmd;
2472 }
2473 wr->ib_sge = ib_sge;
2474
2475 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2476 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2477 GFP_KERNEL);
2478 if (!wr->send_wr) {
2479 isert_dbg("Unable to allocate wr->send_wr\n");
2480 ret = -ENOMEM;
2481 goto unmap_cmd;
2482 }
2483
2484 wr->isert_cmd = isert_cmd;
2485 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2486
2487 for (i = 0; i < wr->send_wr_num; i++) {
2488 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2489 data_len = min(data_left, rdma_write_max);
2490
2491 send_wr->send_flags = 0;
2492 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2493 send_wr->opcode = IB_WR_RDMA_WRITE;
2494 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2495 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2496 if (i + 1 == wr->send_wr_num)
2497 send_wr->next = &isert_cmd->tx_desc.send_wr;
2498 else
2499 send_wr->next = &wr->send_wr[i + 1];
2500 } else {
2501 send_wr->opcode = IB_WR_RDMA_READ;
2502 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2503 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2504 if (i + 1 == wr->send_wr_num)
2505 send_wr->send_flags = IB_SEND_SIGNALED;
2506 else
2507 send_wr->next = &wr->send_wr[i + 1];
2508 }
2509
2510 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2511 send_wr, data_len, offset);
2512 ib_sge += ib_sge_cnt;
2513
2514 offset += data_len;
2515 va_offset += data_len;
2516 data_left -= data_len;
2517 }
2518
2519 return 0;
2520 unmap_cmd:
2521 isert_unmap_data_buf(isert_conn, data);
2522
2523 return ret;
2524 }
2525
2526 static int
2527 isert_map_fr_pagelist(struct ib_device *ib_dev,
2528 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2529 {
2530 u64 start_addr, end_addr, page, chunk_start = 0;
2531 struct scatterlist *tmp_sg;
2532 int i = 0, new_chunk, last_ent, n_pages;
2533
2534 n_pages = 0;
2535 new_chunk = 1;
2536 last_ent = sg_nents - 1;
2537 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2538 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2539 if (new_chunk)
2540 chunk_start = start_addr;
2541 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2542
2543 isert_dbg("SGL[%d] dma_addr: 0x%llx len: %u\n",
2544 i, (unsigned long long)tmp_sg->dma_address,
2545 tmp_sg->length);
2546
2547 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2548 new_chunk = 0;
2549 continue;
2550 }
2551 new_chunk = 1;
2552
2553 page = chunk_start & PAGE_MASK;
2554 do {
2555 fr_pl[n_pages++] = page;
2556 isert_dbg("Mapped page_list[%d] page_addr: 0x%llx\n",
2557 n_pages - 1, page);
2558 page += PAGE_SIZE;
2559 } while (page < end_addr);
2560 }
2561
2562 return n_pages;
2563 }
2564
2565 static inline void
2566 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2567 {
2568 u32 rkey;
2569
2570 memset(inv_wr, 0, sizeof(*inv_wr));
2571 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2572 inv_wr->opcode = IB_WR_LOCAL_INV;
2573 inv_wr->ex.invalidate_rkey = mr->rkey;
2574
2575 /* Bump the key */
2576 rkey = ib_inc_rkey(mr->rkey);
2577 ib_update_fast_reg_key(mr, rkey);
2578 }
2579
2580 static int
2581 isert_fast_reg_mr(struct isert_conn *isert_conn,
2582 struct fast_reg_descriptor *fr_desc,
2583 struct isert_data_buf *mem,
2584 enum isert_indicator ind,
2585 struct ib_sge *sge)
2586 {
2587 struct isert_device *device = isert_conn->device;
2588 struct ib_device *ib_dev = device->ib_device;
2589 struct ib_mr *mr;
2590 struct ib_fast_reg_page_list *frpl;
2591 struct ib_send_wr fr_wr, inv_wr;
2592 struct ib_send_wr *bad_wr, *wr = NULL;
2593 int ret, pagelist_len;
2594 u32 page_off;
2595
2596 if (mem->dma_nents == 1) {
2597 sge->lkey = device->mr->lkey;
2598 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2599 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2600 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2601 sge->addr, sge->length, sge->lkey);
2602 return 0;
2603 }
2604
2605 if (ind == ISERT_DATA_KEY_VALID) {
2606 /* Registering data buffer */
2607 mr = fr_desc->data_mr;
2608 frpl = fr_desc->data_frpl;
2609 } else {
2610 /* Registering protection buffer */
2611 mr = fr_desc->pi_ctx->prot_mr;
2612 frpl = fr_desc->pi_ctx->prot_frpl;
2613 }
2614
2615 page_off = mem->offset % PAGE_SIZE;
2616
2617 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2618 fr_desc, mem->nents, mem->offset);
2619
2620 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
2621 &frpl->page_list[0]);
2622
2623 if (!(fr_desc->ind & ind)) {
2624 isert_inv_rkey(&inv_wr, mr);
2625 wr = &inv_wr;
2626 }
2627
2628 /* Prepare FASTREG WR */
2629 memset(&fr_wr, 0, sizeof(fr_wr));
2630 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
2631 fr_wr.opcode = IB_WR_FAST_REG_MR;
2632 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2633 fr_wr.wr.fast_reg.page_list = frpl;
2634 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2635 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2636 fr_wr.wr.fast_reg.length = mem->len;
2637 fr_wr.wr.fast_reg.rkey = mr->rkey;
2638 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2639
2640 if (!wr)
2641 wr = &fr_wr;
2642 else
2643 wr->next = &fr_wr;
2644
2645 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2646 if (ret) {
2647 isert_err("fast registration failed, ret:%d\n", ret);
2648 return ret;
2649 }
2650 fr_desc->ind &= ~ind;
2651
2652 sge->lkey = mr->lkey;
2653 sge->addr = frpl->page_list[0] + page_off;
2654 sge->length = mem->len;
2655
2656 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2657 sge->addr, sge->length, sge->lkey);
2658
2659 return ret;
2660 }
2661
2662 static inline void
2663 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2664 struct ib_sig_domain *domain)
2665 {
2666 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2667 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2668 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2669 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2670 /*
2671 * At the moment we hard code those, but if in the future
2672 * the target core would like to use it, we will take it
2673 * from se_cmd.
2674 */
2675 domain->sig.dif.apptag_check_mask = 0xffff;
2676 domain->sig.dif.app_escape = true;
2677 domain->sig.dif.ref_escape = true;
2678 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2679 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2680 domain->sig.dif.ref_remap = true;
2681 };
2682
2683 static int
2684 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2685 {
2686 switch (se_cmd->prot_op) {
2687 case TARGET_PROT_DIN_INSERT:
2688 case TARGET_PROT_DOUT_STRIP:
2689 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2690 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2691 break;
2692 case TARGET_PROT_DOUT_INSERT:
2693 case TARGET_PROT_DIN_STRIP:
2694 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2695 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2696 break;
2697 case TARGET_PROT_DIN_PASS:
2698 case TARGET_PROT_DOUT_PASS:
2699 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2700 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2701 break;
2702 default:
2703 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2704 return -EINVAL;
2705 }
2706
2707 return 0;
2708 }
2709
2710 static inline u8
2711 isert_set_prot_checks(u8 prot_checks)
2712 {
2713 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2714 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2715 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2716 }
2717
2718 static int
2719 isert_reg_sig_mr(struct isert_conn *isert_conn,
2720 struct se_cmd *se_cmd,
2721 struct isert_rdma_wr *rdma_wr,
2722 struct fast_reg_descriptor *fr_desc)
2723 {
2724 struct ib_send_wr sig_wr, inv_wr;
2725 struct ib_send_wr *bad_wr, *wr = NULL;
2726 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2727 struct ib_sig_attrs sig_attrs;
2728 int ret;
2729
2730 memset(&sig_attrs, 0, sizeof(sig_attrs));
2731 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2732 if (ret)
2733 goto err;
2734
2735 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2736
2737 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2738 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2739 wr = &inv_wr;
2740 }
2741
2742 memset(&sig_wr, 0, sizeof(sig_wr));
2743 sig_wr.opcode = IB_WR_REG_SIG_MR;
2744 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
2745 sig_wr.sg_list = &rdma_wr->ib_sg[DATA];
2746 sig_wr.num_sge = 1;
2747 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2748 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2749 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2750 if (se_cmd->t_prot_sg)
2751 sig_wr.wr.sig_handover.prot = &rdma_wr->ib_sg[PROT];
2752
2753 if (!wr)
2754 wr = &sig_wr;
2755 else
2756 wr->next = &sig_wr;
2757
2758 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2759 if (ret) {
2760 isert_err("fast registration failed, ret:%d\n", ret);
2761 goto err;
2762 }
2763 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2764
2765 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2766 rdma_wr->ib_sg[SIG].addr = 0;
2767 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2768 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2769 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2770 /*
2771 * We have protection guards on the wire
2772 * so we need to set a larget transfer
2773 */
2774 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2775
2776 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2777 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2778 rdma_wr->ib_sg[SIG].lkey);
2779 err:
2780 return ret;
2781 }
2782
2783 static int
2784 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2785 struct isert_cmd *isert_cmd,
2786 struct isert_rdma_wr *wr)
2787 {
2788 struct isert_device *device = isert_conn->device;
2789 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2790 int ret;
2791
2792 if (!wr->fr_desc->pi_ctx) {
2793 ret = isert_create_pi_ctx(wr->fr_desc,
2794 device->ib_device,
2795 device->pd);
2796 if (ret) {
2797 isert_err("conn %p failed to allocate pi_ctx\n",
2798 isert_conn);
2799 return ret;
2800 }
2801 }
2802
2803 if (se_cmd->t_prot_sg) {
2804 ret = isert_map_data_buf(isert_conn, isert_cmd,
2805 se_cmd->t_prot_sg,
2806 se_cmd->t_prot_nents,
2807 se_cmd->prot_length,
2808 0, wr->iser_ib_op, &wr->prot);
2809 if (ret) {
2810 isert_err("conn %p failed to map protection buffer\n",
2811 isert_conn);
2812 return ret;
2813 }
2814
2815 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2816 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2817 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2818 if (ret) {
2819 isert_err("conn %p failed to fast reg mr\n",
2820 isert_conn);
2821 goto unmap_prot_cmd;
2822 }
2823 }
2824
2825 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2826 if (ret) {
2827 isert_err("conn %p failed to fast reg mr\n",
2828 isert_conn);
2829 goto unmap_prot_cmd;
2830 }
2831 wr->fr_desc->ind |= ISERT_PROTECTED;
2832
2833 return 0;
2834
2835 unmap_prot_cmd:
2836 if (se_cmd->t_prot_sg)
2837 isert_unmap_data_buf(isert_conn, &wr->prot);
2838
2839 return ret;
2840 }
2841
2842 static int
2843 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2844 struct isert_rdma_wr *wr)
2845 {
2846 struct se_cmd *se_cmd = &cmd->se_cmd;
2847 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2848 struct isert_conn *isert_conn = conn->context;
2849 struct fast_reg_descriptor *fr_desc = NULL;
2850 struct ib_send_wr *send_wr;
2851 struct ib_sge *ib_sg;
2852 u32 offset;
2853 int ret = 0;
2854 unsigned long flags;
2855
2856 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2857
2858 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2859 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2860 se_cmd->t_data_nents, se_cmd->data_length,
2861 offset, wr->iser_ib_op, &wr->data);
2862 if (ret)
2863 return ret;
2864
2865 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2866 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2867 fr_desc = list_first_entry(&isert_conn->fr_pool,
2868 struct fast_reg_descriptor, list);
2869 list_del(&fr_desc->list);
2870 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2871 wr->fr_desc = fr_desc;
2872 }
2873
2874 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2875 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2876 if (ret)
2877 goto unmap_cmd;
2878
2879 if (isert_prot_cmd(isert_conn, se_cmd)) {
2880 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2881 if (ret)
2882 goto unmap_cmd;
2883
2884 ib_sg = &wr->ib_sg[SIG];
2885 } else {
2886 ib_sg = &wr->ib_sg[DATA];
2887 }
2888
2889 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2890 wr->ib_sge = &wr->s_ib_sge;
2891 wr->send_wr_num = 1;
2892 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2893 wr->send_wr = &wr->s_send_wr;
2894 wr->isert_cmd = isert_cmd;
2895
2896 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2897 send_wr->sg_list = &wr->s_ib_sge;
2898 send_wr->num_sge = 1;
2899 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
2900 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2901 send_wr->opcode = IB_WR_RDMA_WRITE;
2902 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2903 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2904 send_wr->send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2905 0 : IB_SEND_SIGNALED;
2906 } else {
2907 send_wr->opcode = IB_WR_RDMA_READ;
2908 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2909 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2910 send_wr->send_flags = IB_SEND_SIGNALED;
2911 }
2912
2913 return 0;
2914
2915 unmap_cmd:
2916 if (fr_desc) {
2917 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2918 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2919 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2920 }
2921 isert_unmap_data_buf(isert_conn, &wr->data);
2922
2923 return ret;
2924 }
2925
2926 static int
2927 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2928 {
2929 struct se_cmd *se_cmd = &cmd->se_cmd;
2930 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2931 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2932 struct isert_conn *isert_conn = conn->context;
2933 struct isert_device *device = isert_conn->device;
2934 struct ib_send_wr *wr_failed;
2935 int rc;
2936
2937 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2938 isert_cmd, se_cmd->data_length);
2939
2940 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2941 rc = device->reg_rdma_mem(conn, cmd, wr);
2942 if (rc) {
2943 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2944 return rc;
2945 }
2946
2947 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2948 /*
2949 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2950 */
2951 isert_create_send_desc(isert_conn, isert_cmd,
2952 &isert_cmd->tx_desc);
2953 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2954 &isert_cmd->tx_desc.iscsi_header);
2955 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2956 isert_init_send_wr(isert_conn, isert_cmd,
2957 &isert_cmd->tx_desc.send_wr);
2958 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
2959 wr->send_wr_num += 1;
2960 }
2961
2962 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2963 if (rc)
2964 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2965
2966 if (!isert_prot_cmd(isert_conn, se_cmd))
2967 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2968 "READ\n", isert_cmd);
2969 else
2970 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2971 isert_cmd);
2972
2973 return 1;
2974 }
2975
2976 static int
2977 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2978 {
2979 struct se_cmd *se_cmd = &cmd->se_cmd;
2980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2981 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2982 struct isert_conn *isert_conn = conn->context;
2983 struct isert_device *device = isert_conn->device;
2984 struct ib_send_wr *wr_failed;
2985 int rc;
2986
2987 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2988 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2989 wr->iser_ib_op = ISER_IB_RDMA_READ;
2990 rc = device->reg_rdma_mem(conn, cmd, wr);
2991 if (rc) {
2992 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2993 return rc;
2994 }
2995
2996 rc = ib_post_send(isert_conn->qp, wr->send_wr, &wr_failed);
2997 if (rc)
2998 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2999
3000 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
3001 isert_cmd);
3002
3003 return 0;
3004 }
3005
3006 static int
3007 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3008 {
3009 int ret;
3010
3011 switch (state) {
3012 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3013 ret = isert_put_nopin(cmd, conn, false);
3014 break;
3015 default:
3016 isert_err("Unknown immediate state: 0x%02x\n", state);
3017 ret = -EINVAL;
3018 break;
3019 }
3020
3021 return ret;
3022 }
3023
3024 static int
3025 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3026 {
3027 struct isert_conn *isert_conn = conn->context;
3028 int ret;
3029
3030 switch (state) {
3031 case ISTATE_SEND_LOGOUTRSP:
3032 ret = isert_put_logout_rsp(cmd, conn);
3033 if (!ret)
3034 isert_conn->logout_posted = true;
3035 break;
3036 case ISTATE_SEND_NOPIN:
3037 ret = isert_put_nopin(cmd, conn, true);
3038 break;
3039 case ISTATE_SEND_TASKMGTRSP:
3040 ret = isert_put_tm_rsp(cmd, conn);
3041 break;
3042 case ISTATE_SEND_REJECT:
3043 ret = isert_put_reject(cmd, conn);
3044 break;
3045 case ISTATE_SEND_TEXTRSP:
3046 ret = isert_put_text_rsp(cmd, conn);
3047 break;
3048 case ISTATE_SEND_STATUS:
3049 /*
3050 * Special case for sending non GOOD SCSI status from TX thread
3051 * context during pre se_cmd excecution failure.
3052 */
3053 ret = isert_put_response(conn, cmd);
3054 break;
3055 default:
3056 isert_err("Unknown response state: 0x%02x\n", state);
3057 ret = -EINVAL;
3058 break;
3059 }
3060
3061 return ret;
3062 }
3063
3064 struct rdma_cm_id *
3065 isert_setup_id(struct isert_np *isert_np)
3066 {
3067 struct iscsi_np *np = isert_np->np;
3068 struct rdma_cm_id *id;
3069 struct sockaddr *sa;
3070 int ret;
3071
3072 sa = (struct sockaddr *)&np->np_sockaddr;
3073 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3074
3075 id = rdma_create_id(isert_cma_handler, isert_np,
3076 RDMA_PS_TCP, IB_QPT_RC);
3077 if (IS_ERR(id)) {
3078 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3079 ret = PTR_ERR(id);
3080 goto out;
3081 }
3082 isert_dbg("id %p context %p\n", id, id->context);
3083
3084 ret = rdma_bind_addr(id, sa);
3085 if (ret) {
3086 isert_err("rdma_bind_addr() failed: %d\n", ret);
3087 goto out_id;
3088 }
3089
3090 ret = rdma_listen(id, 0);
3091 if (ret) {
3092 isert_err("rdma_listen() failed: %d\n", ret);
3093 goto out_id;
3094 }
3095
3096 return id;
3097 out_id:
3098 rdma_destroy_id(id);
3099 out:
3100 return ERR_PTR(ret);
3101 }
3102
3103 static int
3104 isert_setup_np(struct iscsi_np *np,
3105 struct __kernel_sockaddr_storage *ksockaddr)
3106 {
3107 struct isert_np *isert_np;
3108 struct rdma_cm_id *isert_lid;
3109 int ret;
3110
3111 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3112 if (!isert_np) {
3113 isert_err("Unable to allocate struct isert_np\n");
3114 return -ENOMEM;
3115 }
3116 sema_init(&isert_np->np_sem, 0);
3117 mutex_init(&isert_np->np_accept_mutex);
3118 INIT_LIST_HEAD(&isert_np->np_accept_list);
3119 init_completion(&isert_np->np_login_comp);
3120 isert_np->np = np;
3121
3122 /*
3123 * Setup the np->np_sockaddr from the passed sockaddr setup
3124 * in iscsi_target_configfs.c code..
3125 */
3126 memcpy(&np->np_sockaddr, ksockaddr,
3127 sizeof(struct __kernel_sockaddr_storage));
3128
3129 isert_lid = isert_setup_id(isert_np);
3130 if (IS_ERR(isert_lid)) {
3131 ret = PTR_ERR(isert_lid);
3132 goto out;
3133 }
3134
3135 isert_np->np_cm_id = isert_lid;
3136 np->np_context = isert_np;
3137
3138 return 0;
3139
3140 out:
3141 kfree(isert_np);
3142
3143 return ret;
3144 }
3145
3146 static int
3147 isert_rdma_accept(struct isert_conn *isert_conn)
3148 {
3149 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3150 struct rdma_conn_param cp;
3151 int ret;
3152
3153 memset(&cp, 0, sizeof(struct rdma_conn_param));
3154 cp.initiator_depth = isert_conn->initiator_depth;
3155 cp.retry_count = 7;
3156 cp.rnr_retry_count = 7;
3157
3158 ret = rdma_accept(cm_id, &cp);
3159 if (ret) {
3160 isert_err("rdma_accept() failed with: %d\n", ret);
3161 return ret;
3162 }
3163
3164 return 0;
3165 }
3166
3167 static int
3168 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3169 {
3170 struct isert_conn *isert_conn = conn->context;
3171 int ret;
3172
3173 isert_info("before login_req comp conn: %p\n", isert_conn);
3174 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3175 if (ret) {
3176 isert_err("isert_conn %p interrupted before got login req\n",
3177 isert_conn);
3178 return ret;
3179 }
3180 reinit_completion(&isert_conn->login_req_comp);
3181
3182 /*
3183 * For login requests after the first PDU, isert_rx_login_req() will
3184 * kick schedule_delayed_work(&conn->login_work) as the packet is
3185 * received, which turns this callback from iscsi_target_do_login_rx()
3186 * into a NOP.
3187 */
3188 if (!login->first_request)
3189 return 0;
3190
3191 isert_rx_login_req(isert_conn);
3192
3193 isert_info("before login_comp conn: %p\n", conn);
3194 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3195 if (ret)
3196 return ret;
3197
3198 isert_info("processing login->req: %p\n", login->req);
3199
3200 return 0;
3201 }
3202
3203 static void
3204 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3205 struct isert_conn *isert_conn)
3206 {
3207 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3208 struct rdma_route *cm_route = &cm_id->route;
3209 struct sockaddr_in *sock_in;
3210 struct sockaddr_in6 *sock_in6;
3211
3212 conn->login_family = np->np_sockaddr.ss_family;
3213
3214 if (np->np_sockaddr.ss_family == AF_INET6) {
3215 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3216 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3217 &sock_in6->sin6_addr.in6_u);
3218 conn->login_port = ntohs(sock_in6->sin6_port);
3219
3220 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3221 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3222 &sock_in6->sin6_addr.in6_u);
3223 conn->local_port = ntohs(sock_in6->sin6_port);
3224 } else {
3225 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3226 sprintf(conn->login_ip, "%pI4",
3227 &sock_in->sin_addr.s_addr);
3228 conn->login_port = ntohs(sock_in->sin_port);
3229
3230 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3231 sprintf(conn->local_ip, "%pI4",
3232 &sock_in->sin_addr.s_addr);
3233 conn->local_port = ntohs(sock_in->sin_port);
3234 }
3235 }
3236
3237 static int
3238 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3239 {
3240 struct isert_np *isert_np = np->np_context;
3241 struct isert_conn *isert_conn;
3242 int ret;
3243
3244 accept_wait:
3245 ret = down_interruptible(&isert_np->np_sem);
3246 if (ret)
3247 return -ENODEV;
3248
3249 spin_lock_bh(&np->np_thread_lock);
3250 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3251 spin_unlock_bh(&np->np_thread_lock);
3252 isert_dbg("np_thread_state %d\n",
3253 np->np_thread_state);
3254 /**
3255 * No point in stalling here when np_thread
3256 * is in state RESET/SHUTDOWN/EXIT - bail
3257 **/
3258 return -ENODEV;
3259 }
3260 spin_unlock_bh(&np->np_thread_lock);
3261
3262 mutex_lock(&isert_np->np_accept_mutex);
3263 if (list_empty(&isert_np->np_accept_list)) {
3264 mutex_unlock(&isert_np->np_accept_mutex);
3265 goto accept_wait;
3266 }
3267 isert_conn = list_first_entry(&isert_np->np_accept_list,
3268 struct isert_conn, accept_node);
3269 list_del_init(&isert_conn->accept_node);
3270 mutex_unlock(&isert_np->np_accept_mutex);
3271
3272 conn->context = isert_conn;
3273 isert_conn->conn = conn;
3274
3275 isert_set_conn_info(np, conn, isert_conn);
3276
3277 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3278
3279 return 0;
3280 }
3281
3282 static void
3283 isert_free_np(struct iscsi_np *np)
3284 {
3285 struct isert_np *isert_np = np->np_context;
3286 struct isert_conn *isert_conn, *n;
3287
3288 if (isert_np->np_cm_id)
3289 rdma_destroy_id(isert_np->np_cm_id);
3290
3291 /*
3292 * FIXME: At this point we don't have a good way to insure
3293 * that at this point we don't have hanging connections that
3294 * completed RDMA establishment but didn't start iscsi login
3295 * process. So work-around this by cleaning up what ever piled
3296 * up in np_accept_list.
3297 */
3298 mutex_lock(&isert_np->np_accept_mutex);
3299 if (!list_empty(&isert_np->np_accept_list)) {
3300 isert_info("Still have isert connections, cleaning up...\n");
3301 list_for_each_entry_safe(isert_conn, n,
3302 &isert_np->np_accept_list,
3303 accept_node) {
3304 isert_info("cleaning isert_conn %p state (%d)\n",
3305 isert_conn, isert_conn->state);
3306 isert_connect_release(isert_conn);
3307 }
3308 }
3309 mutex_unlock(&isert_np->np_accept_mutex);
3310
3311 np->np_context = NULL;
3312 kfree(isert_np);
3313 }
3314
3315 static void isert_release_work(struct work_struct *work)
3316 {
3317 struct isert_conn *isert_conn = container_of(work,
3318 struct isert_conn,
3319 release_work);
3320
3321 isert_info("Starting release conn %p\n", isert_conn);
3322
3323 wait_for_completion(&isert_conn->wait);
3324
3325 mutex_lock(&isert_conn->mutex);
3326 isert_conn->state = ISER_CONN_DOWN;
3327 mutex_unlock(&isert_conn->mutex);
3328
3329 isert_info("Destroying conn %p\n", isert_conn);
3330 isert_put_conn(isert_conn);
3331 }
3332
3333 static void
3334 isert_wait4logout(struct isert_conn *isert_conn)
3335 {
3336 struct iscsi_conn *conn = isert_conn->conn;
3337
3338 isert_info("conn %p\n", isert_conn);
3339
3340 if (isert_conn->logout_posted) {
3341 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3342 wait_for_completion_timeout(&conn->conn_logout_comp,
3343 SECONDS_FOR_LOGOUT_COMP * HZ);
3344 }
3345 }
3346
3347 static void
3348 isert_wait4cmds(struct iscsi_conn *conn)
3349 {
3350 isert_info("iscsi_conn %p\n", conn);
3351
3352 if (conn->sess) {
3353 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3354 target_wait_for_sess_cmds(conn->sess->se_sess);
3355 }
3356 }
3357
3358 static void
3359 isert_wait4flush(struct isert_conn *isert_conn)
3360 {
3361 struct ib_recv_wr *bad_wr;
3362
3363 isert_info("conn %p\n", isert_conn);
3364
3365 init_completion(&isert_conn->wait_comp_err);
3366 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3367 /* post an indication that all flush errors were consumed */
3368 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3369 isert_err("conn %p failed to post beacon", isert_conn);
3370 return;
3371 }
3372
3373 wait_for_completion(&isert_conn->wait_comp_err);
3374 }
3375
3376 static void isert_wait_conn(struct iscsi_conn *conn)
3377 {
3378 struct isert_conn *isert_conn = conn->context;
3379
3380 isert_info("Starting conn %p\n", isert_conn);
3381
3382 mutex_lock(&isert_conn->mutex);
3383 /*
3384 * Only wait for wait_comp_err if the isert_conn made it
3385 * into full feature phase..
3386 */
3387 if (isert_conn->state == ISER_CONN_INIT) {
3388 mutex_unlock(&isert_conn->mutex);
3389 return;
3390 }
3391 isert_conn_terminate(isert_conn);
3392 mutex_unlock(&isert_conn->mutex);
3393
3394 isert_wait4cmds(conn);
3395 isert_wait4flush(isert_conn);
3396 isert_wait4logout(isert_conn);
3397
3398 queue_work(isert_release_wq, &isert_conn->release_work);
3399 }
3400
3401 static void isert_free_conn(struct iscsi_conn *conn)
3402 {
3403 struct isert_conn *isert_conn = conn->context;
3404
3405 isert_wait4flush(isert_conn);
3406 isert_put_conn(isert_conn);
3407 }
3408
3409 static struct iscsit_transport iser_target_transport = {
3410 .name = "IB/iSER",
3411 .transport_type = ISCSI_INFINIBAND,
3412 .priv_size = sizeof(struct isert_cmd),
3413 .owner = THIS_MODULE,
3414 .iscsit_setup_np = isert_setup_np,
3415 .iscsit_accept_np = isert_accept_np,
3416 .iscsit_free_np = isert_free_np,
3417 .iscsit_wait_conn = isert_wait_conn,
3418 .iscsit_free_conn = isert_free_conn,
3419 .iscsit_get_login_rx = isert_get_login_rx,
3420 .iscsit_put_login_tx = isert_put_login_tx,
3421 .iscsit_immediate_queue = isert_immediate_queue,
3422 .iscsit_response_queue = isert_response_queue,
3423 .iscsit_get_dataout = isert_get_dataout,
3424 .iscsit_queue_data_in = isert_put_datain,
3425 .iscsit_queue_status = isert_put_response,
3426 .iscsit_aborted_task = isert_aborted_task,
3427 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3428 };
3429
3430 static int __init isert_init(void)
3431 {
3432 int ret;
3433
3434 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3435 WQ_UNBOUND | WQ_HIGHPRI, 0);
3436 if (!isert_comp_wq) {
3437 isert_err("Unable to allocate isert_comp_wq\n");
3438 ret = -ENOMEM;
3439 return -ENOMEM;
3440 }
3441
3442 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3443 WQ_UNBOUND_MAX_ACTIVE);
3444 if (!isert_release_wq) {
3445 isert_err("Unable to allocate isert_release_wq\n");
3446 ret = -ENOMEM;
3447 goto destroy_comp_wq;
3448 }
3449
3450 iscsit_register_transport(&iser_target_transport);
3451 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3452
3453 return 0;
3454
3455 destroy_comp_wq:
3456 destroy_workqueue(isert_comp_wq);
3457
3458 return ret;
3459 }
3460
3461 static void __exit isert_exit(void)
3462 {
3463 flush_scheduled_work();
3464 destroy_workqueue(isert_release_wq);
3465 destroy_workqueue(isert_comp_wq);
3466 iscsit_unregister_transport(&iser_target_transport);
3467 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3468 }
3469
3470 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3471 MODULE_VERSION("1.0");
3472 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3473 MODULE_LICENSE("GPL");
3474
3475 module_init(isert_init);
3476 module_exit(isert_exit);
Linux kernel - Deliverables
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