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