?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / infiniband / ulp / isert / ib_isert.c
blob411e4464ca235bc984d5bc34c723a52e06071f31
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_recv_done(struct ib_cq *cq, struct ib_wc *wc);
67 static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
68 static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
69 static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
70
71 static inline bool
72 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
73 {
74 return (conn->pi_support &&
75 cmd->prot_op != TARGET_PROT_NORMAL);
76 }
77
78
79 static void
80 isert_qp_event_callback(struct ib_event *e, void *context)
81 {
82 struct isert_conn *isert_conn = context;
83
84 isert_err("%s (%d): conn %p\n",
85 ib_event_msg(e->event), e->event, isert_conn);
86
87 switch (e->event) {
88 case IB_EVENT_COMM_EST:
89 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
90 break;
91 case IB_EVENT_QP_LAST_WQE_REACHED:
92 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
93 break;
94 default:
95 break;
96 }
97 }
98
99 static struct isert_comp *
100 isert_comp_get(struct isert_conn *isert_conn)
101 {
102 struct isert_device *device = isert_conn->device;
103 struct isert_comp *comp;
104 int i, min = 0;
105
106 mutex_lock(&device_list_mutex);
107 for (i = 0; i < device->comps_used; i++)
108 if (device->comps[i].active_qps <
109 device->comps[min].active_qps)
110 min = i;
111 comp = &device->comps[min];
112 comp->active_qps++;
113 mutex_unlock(&device_list_mutex);
114
115 isert_info("conn %p, using comp %p min_index: %d\n",
116 isert_conn, comp, min);
117
118 return comp;
119 }
120
121 static void
122 isert_comp_put(struct isert_comp *comp)
123 {
124 mutex_lock(&device_list_mutex);
125 comp->active_qps--;
126 mutex_unlock(&device_list_mutex);
127 }
128
129 static struct ib_qp *
130 isert_create_qp(struct isert_conn *isert_conn,
131 struct isert_comp *comp,
132 struct rdma_cm_id *cma_id)
133 {
134 struct isert_device *device = isert_conn->device;
135 struct ib_qp_init_attr attr;
136 int ret;
137
138 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
139 attr.event_handler = isert_qp_event_callback;
140 attr.qp_context = isert_conn;
141 attr.send_cq = comp->cq;
142 attr.recv_cq = comp->cq;
143 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
144 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
145 attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
146 isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
147 device->ib_device->attrs.max_sge_rd);
148 attr.cap.max_recv_sge = 1;
149 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
150 attr.qp_type = IB_QPT_RC;
151 if (device->pi_capable)
152 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
153
154 ret = rdma_create_qp(cma_id, device->pd, &attr);
155 if (ret) {
156 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
157 return ERR_PTR(ret);
158 }
159
160 return cma_id->qp;
161 }
162
163 static int
164 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
165 {
166 struct isert_comp *comp;
167 int ret;
168
169 comp = isert_comp_get(isert_conn);
170 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
171 if (IS_ERR(isert_conn->qp)) {
172 ret = PTR_ERR(isert_conn->qp);
173 goto err;
174 }
175
176 return 0;
177 err:
178 isert_comp_put(comp);
179 return ret;
180 }
181
182 static int
183 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
184 {
185 struct isert_device *device = isert_conn->device;
186 struct ib_device *ib_dev = device->ib_device;
187 struct iser_rx_desc *rx_desc;
188 struct ib_sge *rx_sg;
189 u64 dma_addr;
190 int i, j;
191
192 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
193 sizeof(struct iser_rx_desc), GFP_KERNEL);
194 if (!isert_conn->rx_descs)
195 goto fail;
196
197 rx_desc = isert_conn->rx_descs;
198
199 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
200 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
201 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
202 if (ib_dma_mapping_error(ib_dev, dma_addr))
203 goto dma_map_fail;
204
205 rx_desc->dma_addr = dma_addr;
206
207 rx_sg = &rx_desc->rx_sg;
208 rx_sg->addr = rx_desc->dma_addr;
209 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
210 rx_sg->lkey = device->pd->local_dma_lkey;
211 rx_desc->rx_cqe.done = isert_recv_done;
212 }
213
214 return 0;
215
216 dma_map_fail:
217 rx_desc = isert_conn->rx_descs;
218 for (j = 0; j < i; j++, rx_desc++) {
219 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
220 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
221 }
222 kfree(isert_conn->rx_descs);
223 isert_conn->rx_descs = NULL;
224 fail:
225 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
226
227 return -ENOMEM;
228 }
229
230 static void
231 isert_free_rx_descriptors(struct isert_conn *isert_conn)
232 {
233 struct ib_device *ib_dev = isert_conn->device->ib_device;
234 struct iser_rx_desc *rx_desc;
235 int i;
236
237 if (!isert_conn->rx_descs)
238 return;
239
240 rx_desc = isert_conn->rx_descs;
241 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
242 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
243 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
244 }
245
246 kfree(isert_conn->rx_descs);
247 isert_conn->rx_descs = NULL;
248 }
249
250 static void
251 isert_free_comps(struct isert_device *device)
252 {
253 int i;
254
255 for (i = 0; i < device->comps_used; i++) {
256 struct isert_comp *comp = &device->comps[i];
257
258 if (comp->cq)
259 ib_free_cq(comp->cq);
260 }
261 kfree(device->comps);
262 }
263
264 static int
265 isert_alloc_comps(struct isert_device *device)
266 {
267 int i, max_cqe, ret = 0;
268
269 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
270 device->ib_device->num_comp_vectors));
271
272 isert_info("Using %d CQs, %s supports %d vectors support "
273 "Fast registration %d pi_capable %d\n",
274 device->comps_used, device->ib_device->name,
275 device->ib_device->num_comp_vectors, device->use_fastreg,
276 device->pi_capable);
277
278 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
279 GFP_KERNEL);
280 if (!device->comps) {
281 isert_err("Unable to allocate completion contexts\n");
282 return -ENOMEM;
283 }
284
285 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
286
287 for (i = 0; i < device->comps_used; i++) {
288 struct isert_comp *comp = &device->comps[i];
289
290 comp->device = device;
291 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
292 IB_POLL_WORKQUEUE);
293 if (IS_ERR(comp->cq)) {
294 isert_err("Unable to allocate cq\n");
295 ret = PTR_ERR(comp->cq);
296 comp->cq = NULL;
297 goto out_cq;
298 }
299 }
300
301 return 0;
302 out_cq:
303 isert_free_comps(device);
304 return ret;
305 }
306
307 static int
308 isert_create_device_ib_res(struct isert_device *device)
309 {
310 struct ib_device *ib_dev = device->ib_device;
311 int ret;
312
313 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
314 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
315
316 /* asign function handlers */
317 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
318 ib_dev->attrs.device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
319 device->use_fastreg = 1;
320 device->reg_rdma_mem = isert_reg_rdma;
321 device->unreg_rdma_mem = isert_unreg_rdma;
322 } else {
323 device->use_fastreg = 0;
324 device->reg_rdma_mem = isert_map_rdma;
325 device->unreg_rdma_mem = isert_unmap_cmd;
326 }
327
328 ret = isert_alloc_comps(device);
329 if (ret)
330 goto out;
331
332 device->pd = ib_alloc_pd(ib_dev);
333 if (IS_ERR(device->pd)) {
334 ret = PTR_ERR(device->pd);
335 isert_err("failed to allocate pd, device %p, ret=%d\n",
336 device, ret);
337 goto out_cq;
338 }
339
340 /* Check signature cap */
341 device->pi_capable = ib_dev->attrs.device_cap_flags &
342 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
343
344 return 0;
345
346 out_cq:
347 isert_free_comps(device);
348 out:
349 if (ret > 0)
350 ret = -EINVAL;
351 return ret;
352 }
353
354 static void
355 isert_free_device_ib_res(struct isert_device *device)
356 {
357 isert_info("device %p\n", device);
358
359 ib_dealloc_pd(device->pd);
360 isert_free_comps(device);
361 }
362
363 static void
364 isert_device_put(struct isert_device *device)
365 {
366 mutex_lock(&device_list_mutex);
367 device->refcount--;
368 isert_info("device %p refcount %d\n", device, device->refcount);
369 if (!device->refcount) {
370 isert_free_device_ib_res(device);
371 list_del(&device->dev_node);
372 kfree(device);
373 }
374 mutex_unlock(&device_list_mutex);
375 }
376
377 static struct isert_device *
378 isert_device_get(struct rdma_cm_id *cma_id)
379 {
380 struct isert_device *device;
381 int ret;
382
383 mutex_lock(&device_list_mutex);
384 list_for_each_entry(device, &device_list, dev_node) {
385 if (device->ib_device->node_guid == cma_id->device->node_guid) {
386 device->refcount++;
387 isert_info("Found iser device %p refcount %d\n",
388 device, device->refcount);
389 mutex_unlock(&device_list_mutex);
390 return device;
391 }
392 }
393
394 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
395 if (!device) {
396 mutex_unlock(&device_list_mutex);
397 return ERR_PTR(-ENOMEM);
398 }
399
400 INIT_LIST_HEAD(&device->dev_node);
401
402 device->ib_device = cma_id->device;
403 ret = isert_create_device_ib_res(device);
404 if (ret) {
405 kfree(device);
406 mutex_unlock(&device_list_mutex);
407 return ERR_PTR(ret);
408 }
409
410 device->refcount++;
411 list_add_tail(&device->dev_node, &device_list);
412 isert_info("Created a new iser device %p refcount %d\n",
413 device, device->refcount);
414 mutex_unlock(&device_list_mutex);
415
416 return device;
417 }
418
419 static void
420 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
421 {
422 struct fast_reg_descriptor *fr_desc, *tmp;
423 int i = 0;
424
425 if (list_empty(&isert_conn->fr_pool))
426 return;
427
428 isert_info("Freeing conn %p fastreg pool", isert_conn);
429
430 list_for_each_entry_safe(fr_desc, tmp,
431 &isert_conn->fr_pool, list) {
432 list_del(&fr_desc->list);
433 ib_dereg_mr(fr_desc->data_mr);
434 if (fr_desc->pi_ctx) {
435 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
436 ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
437 kfree(fr_desc->pi_ctx);
438 }
439 kfree(fr_desc);
440 ++i;
441 }
442
443 if (i < isert_conn->fr_pool_size)
444 isert_warn("Pool still has %d regions registered\n",
445 isert_conn->fr_pool_size - i);
446 }
447
448 static int
449 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
450 struct ib_device *device,
451 struct ib_pd *pd)
452 {
453 struct pi_context *pi_ctx;
454 int ret;
455
456 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
457 if (!pi_ctx) {
458 isert_err("Failed to allocate pi context\n");
459 return -ENOMEM;
460 }
461
462 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
463 ISCSI_ISER_SG_TABLESIZE);
464 if (IS_ERR(pi_ctx->prot_mr)) {
465 isert_err("Failed to allocate prot frmr err=%ld\n",
466 PTR_ERR(pi_ctx->prot_mr));
467 ret = PTR_ERR(pi_ctx->prot_mr);
468 goto err_pi_ctx;
469 }
470 desc->ind |= ISERT_PROT_KEY_VALID;
471
472 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
473 if (IS_ERR(pi_ctx->sig_mr)) {
474 isert_err("Failed to allocate signature enabled mr err=%ld\n",
475 PTR_ERR(pi_ctx->sig_mr));
476 ret = PTR_ERR(pi_ctx->sig_mr);
477 goto err_prot_mr;
478 }
479
480 desc->pi_ctx = pi_ctx;
481 desc->ind |= ISERT_SIG_KEY_VALID;
482 desc->ind &= ~ISERT_PROTECTED;
483
484 return 0;
485
486 err_prot_mr:
487 ib_dereg_mr(pi_ctx->prot_mr);
488 err_pi_ctx:
489 kfree(pi_ctx);
490
491 return ret;
492 }
493
494 static int
495 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
496 struct fast_reg_descriptor *fr_desc)
497 {
498 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
499 ISCSI_ISER_SG_TABLESIZE);
500 if (IS_ERR(fr_desc->data_mr)) {
501 isert_err("Failed to allocate data frmr err=%ld\n",
502 PTR_ERR(fr_desc->data_mr));
503 return PTR_ERR(fr_desc->data_mr);
504 }
505 fr_desc->ind |= ISERT_DATA_KEY_VALID;
506
507 isert_dbg("Created fr_desc %p\n", fr_desc);
508
509 return 0;
510 }
511
512 static int
513 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
514 {
515 struct fast_reg_descriptor *fr_desc;
516 struct isert_device *device = isert_conn->device;
517 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
518 struct se_node_acl *se_nacl = se_sess->se_node_acl;
519 int i, ret, tag_num;
520 /*
521 * Setup the number of FRMRs based upon the number of tags
522 * available to session in iscsi_target_locate_portal().
523 */
524 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
525 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
526
527 isert_conn->fr_pool_size = 0;
528 for (i = 0; i < tag_num; i++) {
529 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
530 if (!fr_desc) {
531 isert_err("Failed to allocate fast_reg descriptor\n");
532 ret = -ENOMEM;
533 goto err;
534 }
535
536 ret = isert_create_fr_desc(device->ib_device,
537 device->pd, fr_desc);
538 if (ret) {
539 isert_err("Failed to create fastreg descriptor err=%d\n",
540 ret);
541 kfree(fr_desc);
542 goto err;
543 }
544
545 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
546 isert_conn->fr_pool_size++;
547 }
548
549 isert_dbg("Creating conn %p fastreg pool size=%d",
550 isert_conn, isert_conn->fr_pool_size);
551
552 return 0;
553
554 err:
555 isert_conn_free_fastreg_pool(isert_conn);
556 return ret;
557 }
558
559 static void
560 isert_init_conn(struct isert_conn *isert_conn)
561 {
562 isert_conn->state = ISER_CONN_INIT;
563 INIT_LIST_HEAD(&isert_conn->node);
564 init_completion(&isert_conn->login_comp);
565 init_completion(&isert_conn->login_req_comp);
566 kref_init(&isert_conn->kref);
567 mutex_init(&isert_conn->mutex);
568 spin_lock_init(&isert_conn->pool_lock);
569 INIT_LIST_HEAD(&isert_conn->fr_pool);
570 INIT_WORK(&isert_conn->release_work, isert_release_work);
571 }
572
573 static void
574 isert_free_login_buf(struct isert_conn *isert_conn)
575 {
576 struct ib_device *ib_dev = isert_conn->device->ib_device;
577
578 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
579 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
580 kfree(isert_conn->login_rsp_buf);
581
582 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
583 ISER_RX_PAYLOAD_SIZE,
584 DMA_FROM_DEVICE);
585 kfree(isert_conn->login_req_buf);
586 }
587
588 static int
589 isert_alloc_login_buf(struct isert_conn *isert_conn,
590 struct ib_device *ib_dev)
591 {
592 int ret;
593
594 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
595 GFP_KERNEL);
596 if (!isert_conn->login_req_buf) {
597 isert_err("Unable to allocate isert_conn->login_buf\n");
598 return -ENOMEM;
599 }
600
601 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
602 isert_conn->login_req_buf,
603 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
604 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
605 if (ret) {
606 isert_err("login_req_dma mapping error: %d\n", ret);
607 isert_conn->login_req_dma = 0;
608 goto out_free_login_req_buf;
609 }
610
611 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
612 if (!isert_conn->login_rsp_buf) {
613 isert_err("Unable to allocate isert_conn->login_rspbuf\n");
614 goto out_unmap_login_req_buf;
615 }
616
617 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
618 isert_conn->login_rsp_buf,
619 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
620 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
621 if (ret) {
622 isert_err("login_rsp_dma mapping error: %d\n", ret);
623 isert_conn->login_rsp_dma = 0;
624 goto out_free_login_rsp_buf;
625 }
626
627 return 0;
628
629 out_free_login_rsp_buf:
630 kfree(isert_conn->login_rsp_buf);
631 out_unmap_login_req_buf:
632 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
633 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
634 out_free_login_req_buf:
635 kfree(isert_conn->login_req_buf);
636 return ret;
637 }
638
639 static void
640 isert_set_nego_params(struct isert_conn *isert_conn,
641 struct rdma_conn_param *param)
642 {
643 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
644
645 /* Set max inflight RDMA READ requests */
646 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
647 attr->max_qp_init_rd_atom);
648 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
649
650 if (param->private_data) {
651 u8 flags = *(u8 *)param->private_data;
652
653 /*
654 * use remote invalidation if the both initiator
655 * and the HCA support it
656 */
657 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
658 (attr->device_cap_flags &
659 IB_DEVICE_MEM_MGT_EXTENSIONS);
660 if (isert_conn->snd_w_inv)
661 isert_info("Using remote invalidation\n");
662 }
663 }
664
665 static int
666 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
667 {
668 struct isert_np *isert_np = cma_id->context;
669 struct iscsi_np *np = isert_np->np;
670 struct isert_conn *isert_conn;
671 struct isert_device *device;
672 int ret = 0;
673
674 spin_lock_bh(&np->np_thread_lock);
675 if (!np->enabled) {
676 spin_unlock_bh(&np->np_thread_lock);
677 isert_dbg("iscsi_np is not enabled, reject connect request\n");
678 return rdma_reject(cma_id, NULL, 0);
679 }
680 spin_unlock_bh(&np->np_thread_lock);
681
682 isert_dbg("cma_id: %p, portal: %p\n",
683 cma_id, cma_id->context);
684
685 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
686 if (!isert_conn)
687 return -ENOMEM;
688
689 isert_init_conn(isert_conn);
690 isert_conn->cm_id = cma_id;
691
692 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
693 if (ret)
694 goto out;
695
696 device = isert_device_get(cma_id);
697 if (IS_ERR(device)) {
698 ret = PTR_ERR(device);
699 goto out_rsp_dma_map;
700 }
701 isert_conn->device = device;
702
703 isert_set_nego_params(isert_conn, &event->param.conn);
704
705 ret = isert_conn_setup_qp(isert_conn, cma_id);
706 if (ret)
707 goto out_conn_dev;
708
709 ret = isert_login_post_recv(isert_conn);
710 if (ret)
711 goto out_conn_dev;
712
713 ret = isert_rdma_accept(isert_conn);
714 if (ret)
715 goto out_conn_dev;
716
717 mutex_lock(&isert_np->mutex);
718 list_add_tail(&isert_conn->node, &isert_np->accepted);
719 mutex_unlock(&isert_np->mutex);
720
721 return 0;
722
723 out_conn_dev:
724 isert_device_put(device);
725 out_rsp_dma_map:
726 isert_free_login_buf(isert_conn);
727 out:
728 kfree(isert_conn);
729 rdma_reject(cma_id, NULL, 0);
730 return ret;
731 }
732
733 static void
734 isert_connect_release(struct isert_conn *isert_conn)
735 {
736 struct isert_device *device = isert_conn->device;
737
738 isert_dbg("conn %p\n", isert_conn);
739
740 BUG_ON(!device);
741
742 if (device->use_fastreg)
743 isert_conn_free_fastreg_pool(isert_conn);
744
745 isert_free_rx_descriptors(isert_conn);
746 if (isert_conn->cm_id)
747 rdma_destroy_id(isert_conn->cm_id);
748
749 if (isert_conn->qp) {
750 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
751
752 isert_comp_put(comp);
753 ib_destroy_qp(isert_conn->qp);
754 }
755
756 if (isert_conn->login_req_buf)
757 isert_free_login_buf(isert_conn);
758
759 isert_device_put(device);
760
761 kfree(isert_conn);
762 }
763
764 static void
765 isert_connected_handler(struct rdma_cm_id *cma_id)
766 {
767 struct isert_conn *isert_conn = cma_id->qp->qp_context;
768 struct isert_np *isert_np = cma_id->context;
769
770 isert_info("conn %p\n", isert_conn);
771
772 mutex_lock(&isert_conn->mutex);
773 isert_conn->state = ISER_CONN_UP;
774 kref_get(&isert_conn->kref);
775 mutex_unlock(&isert_conn->mutex);
776
777 mutex_lock(&isert_np->mutex);
778 list_move_tail(&isert_conn->node, &isert_np->pending);
779 mutex_unlock(&isert_np->mutex);
780
781 isert_info("np %p: Allow accept_np to continue\n", isert_np);
782 up(&isert_np->sem);
783 }
784
785 static void
786 isert_release_kref(struct kref *kref)
787 {
788 struct isert_conn *isert_conn = container_of(kref,
789 struct isert_conn, kref);
790
791 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
792 current->pid);
793
794 isert_connect_release(isert_conn);
795 }
796
797 static void
798 isert_put_conn(struct isert_conn *isert_conn)
799 {
800 kref_put(&isert_conn->kref, isert_release_kref);
801 }
802
803 static void
804 isert_handle_unbound_conn(struct isert_conn *isert_conn)
805 {
806 struct isert_np *isert_np = isert_conn->cm_id->context;
807
808 mutex_lock(&isert_np->mutex);
809 if (!list_empty(&isert_conn->node)) {
810 /*
811 * This means iscsi doesn't know this connection
812 * so schedule a cleanup ourselves
813 */
814 list_del_init(&isert_conn->node);
815 isert_put_conn(isert_conn);
816 queue_work(isert_release_wq, &isert_conn->release_work);
817 }
818 mutex_unlock(&isert_np->mutex);
819 }
820
821 /**
822 * isert_conn_terminate() - Initiate connection termination
823 * @isert_conn: isert connection struct
824 *
825 * Notes:
826 * In case the connection state is BOUND, move state
827 * to TEMINATING and start teardown sequence (rdma_disconnect).
828 * In case the connection state is UP, complete flush as well.
829 *
830 * This routine must be called with mutex held. Thus it is
831 * safe to call multiple times.
832 */
833 static void
834 isert_conn_terminate(struct isert_conn *isert_conn)
835 {
836 int err;
837
838 if (isert_conn->state >= ISER_CONN_TERMINATING)
839 return;
840
841 isert_info("Terminating conn %p state %d\n",
842 isert_conn, isert_conn->state);
843 isert_conn->state = ISER_CONN_TERMINATING;
844 err = rdma_disconnect(isert_conn->cm_id);
845 if (err)
846 isert_warn("Failed rdma_disconnect isert_conn %p\n",
847 isert_conn);
848 }
849
850 static int
851 isert_np_cma_handler(struct isert_np *isert_np,
852 enum rdma_cm_event_type event)
853 {
854 isert_dbg("%s (%d): isert np %p\n",
855 rdma_event_msg(event), event, isert_np);
856
857 switch (event) {
858 case RDMA_CM_EVENT_DEVICE_REMOVAL:
859 isert_np->cm_id = NULL;
860 break;
861 case RDMA_CM_EVENT_ADDR_CHANGE:
862 isert_np->cm_id = isert_setup_id(isert_np);
863 if (IS_ERR(isert_np->cm_id)) {
864 isert_err("isert np %p setup id failed: %ld\n",
865 isert_np, PTR_ERR(isert_np->cm_id));
866 isert_np->cm_id = NULL;
867 }
868 break;
869 default:
870 isert_err("isert np %p Unexpected event %d\n",
871 isert_np, event);
872 }
873
874 return -1;
875 }
876
877 static int
878 isert_disconnected_handler(struct rdma_cm_id *cma_id,
879 enum rdma_cm_event_type event)
880 {
881 struct isert_conn *isert_conn = cma_id->qp->qp_context;
882
883 mutex_lock(&isert_conn->mutex);
884 switch (isert_conn->state) {
885 case ISER_CONN_TERMINATING:
886 break;
887 case ISER_CONN_UP:
888 isert_conn_terminate(isert_conn);
889 ib_drain_qp(isert_conn->qp);
890 isert_handle_unbound_conn(isert_conn);
891 break;
892 case ISER_CONN_BOUND:
893 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
894 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
895 break;
896 default:
897 isert_warn("conn %p teminating in state %d\n",
898 isert_conn, isert_conn->state);
899 }
900 mutex_unlock(&isert_conn->mutex);
901
902 return 0;
903 }
904
905 static int
906 isert_connect_error(struct rdma_cm_id *cma_id)
907 {
908 struct isert_conn *isert_conn = cma_id->qp->qp_context;
909
910 list_del_init(&isert_conn->node);
911 isert_conn->cm_id = NULL;
912 isert_put_conn(isert_conn);
913
914 return -1;
915 }
916
917 static int
918 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
919 {
920 struct isert_np *isert_np = cma_id->context;
921 int ret = 0;
922
923 isert_info("%s (%d): status %d id %p np %p\n",
924 rdma_event_msg(event->event), event->event,
925 event->status, cma_id, cma_id->context);
926
927 if (isert_np->cm_id == cma_id)
928 return isert_np_cma_handler(cma_id->context, event->event);
929
930 switch (event->event) {
931 case RDMA_CM_EVENT_CONNECT_REQUEST:
932 ret = isert_connect_request(cma_id, event);
933 if (ret)
934 isert_err("failed handle connect request %d\n", ret);
935 break;
936 case RDMA_CM_EVENT_ESTABLISHED:
937 isert_connected_handler(cma_id);
938 break;
939 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
940 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
941 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
942 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
943 ret = isert_disconnected_handler(cma_id, event->event);
944 break;
945 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
946 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
947 case RDMA_CM_EVENT_CONNECT_ERROR:
948 ret = isert_connect_error(cma_id);
949 break;
950 default:
951 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
952 break;
953 }
954
955 return ret;
956 }
957
958 static int
959 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
960 {
961 struct ib_recv_wr *rx_wr, *rx_wr_failed;
962 int i, ret;
963 struct iser_rx_desc *rx_desc;
964
965 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
966 rx_desc = &isert_conn->rx_descs[i];
967
968 rx_wr->wr_cqe = &rx_desc->rx_cqe;
969 rx_wr->sg_list = &rx_desc->rx_sg;
970 rx_wr->num_sge = 1;
971 rx_wr->next = rx_wr + 1;
972 }
973 rx_wr--;
974 rx_wr->next = NULL; /* mark end of work requests list */
975
976 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
977 &rx_wr_failed);
978 if (ret)
979 isert_err("ib_post_recv() failed with ret: %d\n", ret);
980
981 return ret;
982 }
983
984 static int
985 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
986 {
987 struct ib_recv_wr *rx_wr_failed, rx_wr;
988 int ret;
989
990 rx_wr.wr_cqe = &rx_desc->rx_cqe;
991 rx_wr.sg_list = &rx_desc->rx_sg;
992 rx_wr.num_sge = 1;
993 rx_wr.next = NULL;
994
995 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
996 if (ret)
997 isert_err("ib_post_recv() failed with ret: %d\n", ret);
998
999 return ret;
1000 }
1001
1002 static int
1003 isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1004 {
1005 struct ib_device *ib_dev = isert_conn->cm_id->device;
1006 struct ib_send_wr send_wr, *send_wr_failed;
1007 int ret;
1008
1009 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1010 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1011
1012 tx_desc->tx_cqe.done = isert_login_send_done;
1013
1014 send_wr.next = NULL;
1015 send_wr.wr_cqe = &tx_desc->tx_cqe;
1016 send_wr.sg_list = tx_desc->tx_sg;
1017 send_wr.num_sge = tx_desc->num_sge;
1018 send_wr.opcode = IB_WR_SEND;
1019 send_wr.send_flags = IB_SEND_SIGNALED;
1020
1021 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1022 if (ret)
1023 isert_err("ib_post_send() failed, ret: %d\n", ret);
1024
1025 return ret;
1026 }
1027
1028 static void
1029 isert_create_send_desc(struct isert_conn *isert_conn,
1030 struct isert_cmd *isert_cmd,
1031 struct iser_tx_desc *tx_desc)
1032 {
1033 struct isert_device *device = isert_conn->device;
1034 struct ib_device *ib_dev = device->ib_device;
1035
1036 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1037 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1038
1039 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
1040 tx_desc->iser_header.flags = ISCSI_CTRL;
1041
1042 tx_desc->num_sge = 1;
1043
1044 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1045 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1046 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1047 }
1048 }
1049
1050 static int
1051 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1052 struct iser_tx_desc *tx_desc)
1053 {
1054 struct isert_device *device = isert_conn->device;
1055 struct ib_device *ib_dev = device->ib_device;
1056 u64 dma_addr;
1057
1058 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1059 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1060 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1061 isert_err("ib_dma_mapping_error() failed\n");
1062 return -ENOMEM;
1063 }
1064
1065 tx_desc->dma_addr = dma_addr;
1066 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1067 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1068 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1069
1070 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1071 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1072 tx_desc->tx_sg[0].lkey);
1073
1074 return 0;
1075 }
1076
1077 static void
1078 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1079 struct ib_send_wr *send_wr)
1080 {
1081 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1082
1083 isert_cmd->iser_ib_op = ISER_IB_SEND;
1084 tx_desc->tx_cqe.done = isert_send_done;
1085 send_wr->wr_cqe = &tx_desc->tx_cqe;
1086
1087 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
1088 send_wr->opcode = IB_WR_SEND_WITH_INV;
1089 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
1090 } else {
1091 send_wr->opcode = IB_WR_SEND;
1092 }
1093
1094 send_wr->sg_list = &tx_desc->tx_sg[0];
1095 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1096 send_wr->send_flags = IB_SEND_SIGNALED;
1097 }
1098
1099 static int
1100 isert_login_post_recv(struct isert_conn *isert_conn)
1101 {
1102 struct ib_recv_wr rx_wr, *rx_wr_fail;
1103 struct ib_sge sge;
1104 int ret;
1105
1106 memset(&sge, 0, sizeof(struct ib_sge));
1107 sge.addr = isert_conn->login_req_dma;
1108 sge.length = ISER_RX_PAYLOAD_SIZE;
1109 sge.lkey = isert_conn->device->pd->local_dma_lkey;
1110
1111 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1112 sge.addr, sge.length, sge.lkey);
1113
1114 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
1115
1116 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1117 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
1118 rx_wr.sg_list = &sge;
1119 rx_wr.num_sge = 1;
1120
1121 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1122 if (ret)
1123 isert_err("ib_post_recv() failed: %d\n", ret);
1124
1125 return ret;
1126 }
1127
1128 static int
1129 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1130 u32 length)
1131 {
1132 struct isert_conn *isert_conn = conn->context;
1133 struct isert_device *device = isert_conn->device;
1134 struct ib_device *ib_dev = device->ib_device;
1135 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1136 int ret;
1137
1138 isert_create_send_desc(isert_conn, NULL, tx_desc);
1139
1140 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1141 sizeof(struct iscsi_hdr));
1142
1143 isert_init_tx_hdrs(isert_conn, tx_desc);
1144
1145 if (length > 0) {
1146 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1147
1148 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1149 length, DMA_TO_DEVICE);
1150
1151 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1152
1153 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1154 length, DMA_TO_DEVICE);
1155
1156 tx_dsg->addr = isert_conn->login_rsp_dma;
1157 tx_dsg->length = length;
1158 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1159 tx_desc->num_sge = 2;
1160 }
1161 if (!login->login_failed) {
1162 if (login->login_complete) {
1163 if (!conn->sess->sess_ops->SessionType &&
1164 isert_conn->device->use_fastreg) {
1165 ret = isert_conn_create_fastreg_pool(isert_conn);
1166 if (ret) {
1167 isert_err("Conn: %p failed to create"
1168 " fastreg pool\n", isert_conn);
1169 return ret;
1170 }
1171 }
1172
1173 ret = isert_alloc_rx_descriptors(isert_conn);
1174 if (ret)
1175 return ret;
1176
1177 ret = isert_post_recvm(isert_conn,
1178 ISERT_QP_MAX_RECV_DTOS);
1179 if (ret)
1180 return ret;
1181
1182 /* Now we are in FULL_FEATURE phase */
1183 mutex_lock(&isert_conn->mutex);
1184 isert_conn->state = ISER_CONN_FULL_FEATURE;
1185 mutex_unlock(&isert_conn->mutex);
1186 goto post_send;
1187 }
1188
1189 ret = isert_login_post_recv(isert_conn);
1190 if (ret)
1191 return ret;
1192 }
1193 post_send:
1194 ret = isert_login_post_send(isert_conn, tx_desc);
1195 if (ret)
1196 return ret;
1197
1198 return 0;
1199 }
1200
1201 static void
1202 isert_rx_login_req(struct isert_conn *isert_conn)
1203 {
1204 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1205 int rx_buflen = isert_conn->login_req_len;
1206 struct iscsi_conn *conn = isert_conn->conn;
1207 struct iscsi_login *login = conn->conn_login;
1208 int size;
1209
1210 isert_info("conn %p\n", isert_conn);
1211
1212 WARN_ON_ONCE(!login);
1213
1214 if (login->first_request) {
1215 struct iscsi_login_req *login_req =
1216 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1217 /*
1218 * Setup the initial iscsi_login values from the leading
1219 * login request PDU.
1220 */
1221 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1222 login->current_stage =
1223 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1224 >> 2;
1225 login->version_min = login_req->min_version;
1226 login->version_max = login_req->max_version;
1227 memcpy(login->isid, login_req->isid, 6);
1228 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1229 login->init_task_tag = login_req->itt;
1230 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1231 login->cid = be16_to_cpu(login_req->cid);
1232 login->tsih = be16_to_cpu(login_req->tsih);
1233 }
1234
1235 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1236
1237 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1238 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1239 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1240 MAX_KEY_VALUE_PAIRS);
1241 memcpy(login->req_buf, &rx_desc->data[0], size);
1242
1243 if (login->first_request) {
1244 complete(&isert_conn->login_comp);
1245 return;
1246 }
1247 schedule_delayed_work(&conn->login_work, 0);
1248 }
1249
1250 static struct iscsi_cmd
1251 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1252 {
1253 struct isert_conn *isert_conn = conn->context;
1254 struct isert_cmd *isert_cmd;
1255 struct iscsi_cmd *cmd;
1256
1257 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1258 if (!cmd) {
1259 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1260 return NULL;
1261 }
1262 isert_cmd = iscsit_priv_cmd(cmd);
1263 isert_cmd->conn = isert_conn;
1264 isert_cmd->iscsi_cmd = cmd;
1265 isert_cmd->rx_desc = rx_desc;
1266
1267 return cmd;
1268 }
1269
1270 static int
1271 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1272 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1273 struct iser_rx_desc *rx_desc, unsigned char *buf)
1274 {
1275 struct iscsi_conn *conn = isert_conn->conn;
1276 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1277 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1278 bool dump_payload = false;
1279 unsigned int data_len;
1280
1281 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1282 if (rc < 0)
1283 return rc;
1284
1285 imm_data = cmd->immediate_data;
1286 imm_data_len = cmd->first_burst_len;
1287 unsol_data = cmd->unsolicited_data;
1288 data_len = cmd->se_cmd.data_length;
1289
1290 if (imm_data && imm_data_len == data_len)
1291 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1292 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1293 if (rc < 0) {
1294 return 0;
1295 } else if (rc > 0) {
1296 dump_payload = true;
1297 goto sequence_cmd;
1298 }
1299
1300 if (!imm_data)
1301 return 0;
1302
1303 if (imm_data_len != data_len) {
1304 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1305 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1306 &rx_desc->data[0], imm_data_len);
1307 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1308 sg_nents, imm_data_len);
1309 } else {
1310 sg_init_table(&isert_cmd->sg, 1);
1311 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1312 cmd->se_cmd.t_data_nents = 1;
1313 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1314 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1315 imm_data_len);
1316 }
1317
1318 cmd->write_data_done += imm_data_len;
1319
1320 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1321 spin_lock_bh(&cmd->istate_lock);
1322 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1323 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1324 spin_unlock_bh(&cmd->istate_lock);
1325 }
1326
1327 sequence_cmd:
1328 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1329
1330 if (!rc && dump_payload == false && unsol_data)
1331 iscsit_set_unsoliticed_dataout(cmd);
1332 else if (dump_payload && imm_data)
1333 target_put_sess_cmd(&cmd->se_cmd);
1334
1335 return 0;
1336 }
1337
1338 static int
1339 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1340 struct iser_rx_desc *rx_desc, unsigned char *buf)
1341 {
1342 struct scatterlist *sg_start;
1343 struct iscsi_conn *conn = isert_conn->conn;
1344 struct iscsi_cmd *cmd = NULL;
1345 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1346 u32 unsol_data_len = ntoh24(hdr->dlength);
1347 int rc, sg_nents, sg_off, page_off;
1348
1349 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1350 if (rc < 0)
1351 return rc;
1352 else if (!cmd)
1353 return 0;
1354 /*
1355 * FIXME: Unexpected unsolicited_data out
1356 */
1357 if (!cmd->unsolicited_data) {
1358 isert_err("Received unexpected solicited data payload\n");
1359 dump_stack();
1360 return -1;
1361 }
1362
1363 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1364 "write_data_done: %u, data_length: %u\n",
1365 unsol_data_len, cmd->write_data_done,
1366 cmd->se_cmd.data_length);
1367
1368 sg_off = cmd->write_data_done / PAGE_SIZE;
1369 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1370 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1371 page_off = cmd->write_data_done % PAGE_SIZE;
1372 /*
1373 * FIXME: Non page-aligned unsolicited_data out
1374 */
1375 if (page_off) {
1376 isert_err("unexpected non-page aligned data payload\n");
1377 dump_stack();
1378 return -1;
1379 }
1380 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1381 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1382 sg_nents, &rx_desc->data[0], unsol_data_len);
1383
1384 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1385 unsol_data_len);
1386
1387 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1388 if (rc < 0)
1389 return rc;
1390
1391 /*
1392 * multiple data-outs on the same command can arrive -
1393 * so post the buffer before hand
1394 */
1395 rc = isert_post_recv(isert_conn, rx_desc);
1396 if (rc) {
1397 isert_err("ib_post_recv failed with %d\n", rc);
1398 return rc;
1399 }
1400 return 0;
1401 }
1402
1403 static int
1404 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1405 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1406 unsigned char *buf)
1407 {
1408 struct iscsi_conn *conn = isert_conn->conn;
1409 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1410 int rc;
1411
1412 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1413 if (rc < 0)
1414 return rc;
1415 /*
1416 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1417 */
1418
1419 return iscsit_process_nop_out(conn, cmd, hdr);
1420 }
1421
1422 static int
1423 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1424 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1425 struct iscsi_text *hdr)
1426 {
1427 struct iscsi_conn *conn = isert_conn->conn;
1428 u32 payload_length = ntoh24(hdr->dlength);
1429 int rc;
1430 unsigned char *text_in = NULL;
1431
1432 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1433 if (rc < 0)
1434 return rc;
1435
1436 if (payload_length) {
1437 text_in = kzalloc(payload_length, GFP_KERNEL);
1438 if (!text_in) {
1439 isert_err("Unable to allocate text_in of payload_length: %u\n",
1440 payload_length);
1441 return -ENOMEM;
1442 }
1443 }
1444 cmd->text_in_ptr = text_in;
1445
1446 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1447
1448 return iscsit_process_text_cmd(conn, cmd, hdr);
1449 }
1450
1451 static int
1452 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1453 uint32_t read_stag, uint64_t read_va,
1454 uint32_t write_stag, uint64_t write_va)
1455 {
1456 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1457 struct iscsi_conn *conn = isert_conn->conn;
1458 struct iscsi_cmd *cmd;
1459 struct isert_cmd *isert_cmd;
1460 int ret = -EINVAL;
1461 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1462
1463 if (conn->sess->sess_ops->SessionType &&
1464 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1465 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1466 " ignoring\n", opcode);
1467 return 0;
1468 }
1469
1470 switch (opcode) {
1471 case ISCSI_OP_SCSI_CMD:
1472 cmd = isert_allocate_cmd(conn, rx_desc);
1473 if (!cmd)
1474 break;
1475
1476 isert_cmd = iscsit_priv_cmd(cmd);
1477 isert_cmd->read_stag = read_stag;
1478 isert_cmd->read_va = read_va;
1479 isert_cmd->write_stag = write_stag;
1480 isert_cmd->write_va = write_va;
1481 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1482
1483 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1484 rx_desc, (unsigned char *)hdr);
1485 break;
1486 case ISCSI_OP_NOOP_OUT:
1487 cmd = isert_allocate_cmd(conn, rx_desc);
1488 if (!cmd)
1489 break;
1490
1491 isert_cmd = iscsit_priv_cmd(cmd);
1492 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1493 rx_desc, (unsigned char *)hdr);
1494 break;
1495 case ISCSI_OP_SCSI_DATA_OUT:
1496 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1497 (unsigned char *)hdr);
1498 break;
1499 case ISCSI_OP_SCSI_TMFUNC:
1500 cmd = isert_allocate_cmd(conn, rx_desc);
1501 if (!cmd)
1502 break;
1503
1504 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1505 (unsigned char *)hdr);
1506 break;
1507 case ISCSI_OP_LOGOUT:
1508 cmd = isert_allocate_cmd(conn, rx_desc);
1509 if (!cmd)
1510 break;
1511
1512 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1513 break;
1514 case ISCSI_OP_TEXT:
1515 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1516 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1517 else
1518 cmd = isert_allocate_cmd(conn, rx_desc);
1519
1520 if (!cmd)
1521 break;
1522
1523 isert_cmd = iscsit_priv_cmd(cmd);
1524 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1525 rx_desc, (struct iscsi_text *)hdr);
1526 break;
1527 default:
1528 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1529 dump_stack();
1530 break;
1531 }
1532
1533 return ret;
1534 }
1535
1536 static void
1537 isert_print_wc(struct ib_wc *wc, const char *type)
1538 {
1539 if (wc->status != IB_WC_WR_FLUSH_ERR)
1540 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1541 ib_wc_status_msg(wc->status), wc->status,
1542 wc->vendor_err);
1543 else
1544 isert_dbg("%s failure: %s (%d)\n", type,
1545 ib_wc_status_msg(wc->status), wc->status);
1546 }
1547
1548 static void
1549 isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1550 {
1551 struct isert_conn *isert_conn = wc->qp->qp_context;
1552 struct ib_device *ib_dev = isert_conn->cm_id->device;
1553 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1554 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1555 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1556 uint64_t read_va = 0, write_va = 0;
1557 uint32_t read_stag = 0, write_stag = 0;
1558
1559 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1560 isert_print_wc(wc, "recv");
1561 if (wc->status != IB_WC_WR_FLUSH_ERR)
1562 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1563 return;
1564 }
1565
1566 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1567 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1568
1569 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1570 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1571 (int)(wc->byte_len - ISER_HEADERS_LEN));
1572
1573 switch (iser_ctrl->flags & 0xF0) {
1574 case ISCSI_CTRL:
1575 if (iser_ctrl->flags & ISER_RSV) {
1576 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1577 read_va = be64_to_cpu(iser_ctrl->read_va);
1578 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1579 read_stag, (unsigned long long)read_va);
1580 }
1581 if (iser_ctrl->flags & ISER_WSV) {
1582 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1583 write_va = be64_to_cpu(iser_ctrl->write_va);
1584 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1585 write_stag, (unsigned long long)write_va);
1586 }
1587
1588 isert_dbg("ISER ISCSI_CTRL PDU\n");
1589 break;
1590 case ISER_HELLO:
1591 isert_err("iSER Hello message\n");
1592 break;
1593 default:
1594 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1595 break;
1596 }
1597
1598 isert_rx_opcode(isert_conn, rx_desc,
1599 read_stag, read_va, write_stag, write_va);
1600
1601 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1602 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1603 }
1604
1605 static void
1606 isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1607 {
1608 struct isert_conn *isert_conn = wc->qp->qp_context;
1609 struct ib_device *ib_dev = isert_conn->cm_id->device;
1610
1611 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1612 isert_print_wc(wc, "login recv");
1613 return;
1614 }
1615
1616 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1617 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1618
1619 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1620
1621 if (isert_conn->conn) {
1622 struct iscsi_login *login = isert_conn->conn->conn_login;
1623
1624 if (login && !login->first_request)
1625 isert_rx_login_req(isert_conn);
1626 }
1627
1628 mutex_lock(&isert_conn->mutex);
1629 complete(&isert_conn->login_req_comp);
1630 mutex_unlock(&isert_conn->mutex);
1631
1632 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1633 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1634 }
1635
1636 static int
1637 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1638 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1639 enum iser_ib_op_code op, struct isert_data_buf *data)
1640 {
1641 struct ib_device *ib_dev = isert_conn->cm_id->device;
1642
1643 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1644 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1645
1646 data->len = length - offset;
1647 data->offset = offset;
1648 data->sg_off = data->offset / PAGE_SIZE;
1649
1650 data->sg = &sg[data->sg_off];
1651 data->nents = min_t(unsigned int, nents - data->sg_off,
1652 ISCSI_ISER_SG_TABLESIZE);
1653 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1654 PAGE_SIZE);
1655
1656 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1657 data->dma_dir);
1658 if (unlikely(!data->dma_nents)) {
1659 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1660 return -EINVAL;
1661 }
1662
1663 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1664 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1665
1666 return 0;
1667 }
1668
1669 static void
1670 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1671 {
1672 struct ib_device *ib_dev = isert_conn->cm_id->device;
1673
1674 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1675 memset(data, 0, sizeof(*data));
1676 }
1677
1678
1679
1680 static void
1681 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1682 {
1683 isert_dbg("Cmd %p\n", isert_cmd);
1684
1685 if (isert_cmd->data.sg) {
1686 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1687 isert_unmap_data_buf(isert_conn, &isert_cmd->data);
1688 }
1689
1690 if (isert_cmd->rdma_wr) {
1691 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1692 kfree(isert_cmd->rdma_wr);
1693 isert_cmd->rdma_wr = NULL;
1694 }
1695
1696 if (isert_cmd->ib_sge) {
1697 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1698 kfree(isert_cmd->ib_sge);
1699 isert_cmd->ib_sge = NULL;
1700 }
1701 }
1702
1703 static void
1704 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1705 {
1706 isert_dbg("Cmd %p\n", isert_cmd);
1707
1708 if (isert_cmd->fr_desc) {
1709 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, isert_cmd->fr_desc);
1710 if (isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1711 isert_unmap_data_buf(isert_conn, &isert_cmd->prot);
1712 isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1713 }
1714 spin_lock_bh(&isert_conn->pool_lock);
1715 list_add_tail(&isert_cmd->fr_desc->list, &isert_conn->fr_pool);
1716 spin_unlock_bh(&isert_conn->pool_lock);
1717 isert_cmd->fr_desc = NULL;
1718 }
1719
1720 if (isert_cmd->data.sg) {
1721 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1722 isert_unmap_data_buf(isert_conn, &isert_cmd->data);
1723 }
1724
1725 isert_cmd->ib_sge = NULL;
1726 isert_cmd->rdma_wr = NULL;
1727 }
1728
1729 static void
1730 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1731 {
1732 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1733 struct isert_conn *isert_conn = isert_cmd->conn;
1734 struct iscsi_conn *conn = isert_conn->conn;
1735 struct isert_device *device = isert_conn->device;
1736 struct iscsi_text_rsp *hdr;
1737
1738 isert_dbg("Cmd %p\n", isert_cmd);
1739
1740 switch (cmd->iscsi_opcode) {
1741 case ISCSI_OP_SCSI_CMD:
1742 spin_lock_bh(&conn->cmd_lock);
1743 if (!list_empty(&cmd->i_conn_node))
1744 list_del_init(&cmd->i_conn_node);
1745 spin_unlock_bh(&conn->cmd_lock);
1746
1747 if (cmd->data_direction == DMA_TO_DEVICE) {
1748 iscsit_stop_dataout_timer(cmd);
1749 /*
1750 * Check for special case during comp_err where
1751 * WRITE_PENDING has been handed off from core,
1752 * but requires an extra target_put_sess_cmd()
1753 * before transport_generic_free_cmd() below.
1754 */
1755 if (comp_err &&
1756 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1757 struct se_cmd *se_cmd = &cmd->se_cmd;
1758
1759 target_put_sess_cmd(se_cmd);
1760 }
1761 }
1762
1763 device->unreg_rdma_mem(isert_cmd, isert_conn);
1764 transport_generic_free_cmd(&cmd->se_cmd, 0);
1765 break;
1766 case ISCSI_OP_SCSI_TMFUNC:
1767 spin_lock_bh(&conn->cmd_lock);
1768 if (!list_empty(&cmd->i_conn_node))
1769 list_del_init(&cmd->i_conn_node);
1770 spin_unlock_bh(&conn->cmd_lock);
1771
1772 transport_generic_free_cmd(&cmd->se_cmd, 0);
1773 break;
1774 case ISCSI_OP_REJECT:
1775 case ISCSI_OP_NOOP_OUT:
1776 case ISCSI_OP_TEXT:
1777 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1778 /* If the continue bit is on, keep the command alive */
1779 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1780 break;
1781
1782 spin_lock_bh(&conn->cmd_lock);
1783 if (!list_empty(&cmd->i_conn_node))
1784 list_del_init(&cmd->i_conn_node);
1785 spin_unlock_bh(&conn->cmd_lock);
1786
1787 /*
1788 * Handle special case for REJECT when iscsi_add_reject*() has
1789 * overwritten the original iscsi_opcode assignment, and the
1790 * associated cmd->se_cmd needs to be released.
1791 */
1792 if (cmd->se_cmd.se_tfo != NULL) {
1793 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1794 cmd->iscsi_opcode);
1795 transport_generic_free_cmd(&cmd->se_cmd, 0);
1796 break;
1797 }
1798 /*
1799 * Fall-through
1800 */
1801 default:
1802 iscsit_release_cmd(cmd);
1803 break;
1804 }
1805 }
1806
1807 static void
1808 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1809 {
1810 if (tx_desc->dma_addr != 0) {
1811 isert_dbg("unmap single for tx_desc->dma_addr\n");
1812 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1813 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1814 tx_desc->dma_addr = 0;
1815 }
1816 }
1817
1818 static void
1819 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1820 struct ib_device *ib_dev, bool comp_err)
1821 {
1822 if (isert_cmd->pdu_buf_dma != 0) {
1823 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1824 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1825 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1826 isert_cmd->pdu_buf_dma = 0;
1827 }
1828
1829 isert_unmap_tx_desc(tx_desc, ib_dev);
1830 isert_put_cmd(isert_cmd, comp_err);
1831 }
1832
1833 static int
1834 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1835 {
1836 struct ib_mr_status mr_status;
1837 int ret;
1838
1839 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1840 if (ret) {
1841 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1842 goto fail_mr_status;
1843 }
1844
1845 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1846 u64 sec_offset_err;
1847 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1848
1849 switch (mr_status.sig_err.err_type) {
1850 case IB_SIG_BAD_GUARD:
1851 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1852 break;
1853 case IB_SIG_BAD_REFTAG:
1854 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1855 break;
1856 case IB_SIG_BAD_APPTAG:
1857 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1858 break;
1859 }
1860 sec_offset_err = mr_status.sig_err.sig_err_offset;
1861 do_div(sec_offset_err, block_size);
1862 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1863
1864 isert_err("PI error found type %d at sector 0x%llx "
1865 "expected 0x%x vs actual 0x%x\n",
1866 mr_status.sig_err.err_type,
1867 (unsigned long long)se_cmd->bad_sector,
1868 mr_status.sig_err.expected,
1869 mr_status.sig_err.actual);
1870 ret = 1;
1871 }
1872
1873 fail_mr_status:
1874 return ret;
1875 }
1876
1877 static void
1878 isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1879 {
1880 struct isert_conn *isert_conn = wc->qp->qp_context;
1881 struct isert_device *device = isert_conn->device;
1882 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1883 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1884 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1885 int ret = 0;
1886
1887 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1888 isert_print_wc(wc, "rdma write");
1889 if (wc->status != IB_WC_WR_FLUSH_ERR)
1890 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1891 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1892 return;
1893 }
1894
1895 isert_dbg("Cmd %p\n", isert_cmd);
1896
1897 if (isert_cmd->fr_desc && isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1898 ret = isert_check_pi_status(cmd,
1899 isert_cmd->fr_desc->pi_ctx->sig_mr);
1900 isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1901 }
1902
1903 device->unreg_rdma_mem(isert_cmd, isert_conn);
1904 isert_cmd->rdma_wr_num = 0;
1905 if (ret)
1906 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1907 else
1908 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1909 }
1910
1911 static void
1912 isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1913 {
1914 struct isert_conn *isert_conn = wc->qp->qp_context;
1915 struct isert_device *device = isert_conn->device;
1916 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1917 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1918 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1919 struct se_cmd *se_cmd = &cmd->se_cmd;
1920 int ret = 0;
1921
1922 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1923 isert_print_wc(wc, "rdma read");
1924 if (wc->status != IB_WC_WR_FLUSH_ERR)
1925 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1926 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1927 return;
1928 }
1929
1930 isert_dbg("Cmd %p\n", isert_cmd);
1931
1932 if (isert_cmd->fr_desc && isert_cmd->fr_desc->ind & ISERT_PROTECTED) {
1933 ret = isert_check_pi_status(se_cmd,
1934 isert_cmd->fr_desc->pi_ctx->sig_mr);
1935 isert_cmd->fr_desc->ind &= ~ISERT_PROTECTED;
1936 }
1937
1938 iscsit_stop_dataout_timer(cmd);
1939 device->unreg_rdma_mem(isert_cmd, isert_conn);
1940 cmd->write_data_done = isert_cmd->data.len;
1941 isert_cmd->rdma_wr_num = 0;
1942
1943 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1944 spin_lock_bh(&cmd->istate_lock);
1945 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1946 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1947 spin_unlock_bh(&cmd->istate_lock);
1948
1949 if (ret) {
1950 target_put_sess_cmd(se_cmd);
1951 transport_send_check_condition_and_sense(se_cmd,
1952 se_cmd->pi_err, 0);
1953 } else {
1954 target_execute_cmd(se_cmd);
1955 }
1956 }
1957
1958 static void
1959 isert_do_control_comp(struct work_struct *work)
1960 {
1961 struct isert_cmd *isert_cmd = container_of(work,
1962 struct isert_cmd, comp_work);
1963 struct isert_conn *isert_conn = isert_cmd->conn;
1964 struct ib_device *ib_dev = isert_conn->cm_id->device;
1965 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1966
1967 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1968
1969 switch (cmd->i_state) {
1970 case ISTATE_SEND_TASKMGTRSP:
1971 iscsit_tmr_post_handler(cmd, cmd->conn);
1972 case ISTATE_SEND_REJECT: /* FALLTHRU */
1973 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1974 cmd->i_state = ISTATE_SENT_STATUS;
1975 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1976 ib_dev, false);
1977 break;
1978 case ISTATE_SEND_LOGOUTRSP:
1979 iscsit_logout_post_handler(cmd, cmd->conn);
1980 break;
1981 default:
1982 isert_err("Unknown i_state %d\n", cmd->i_state);
1983 dump_stack();
1984 break;
1985 }
1986 }
1987
1988 static void
1989 isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1990 {
1991 struct isert_conn *isert_conn = wc->qp->qp_context;
1992 struct ib_device *ib_dev = isert_conn->cm_id->device;
1993 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1994
1995 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1996 isert_print_wc(wc, "login send");
1997 if (wc->status != IB_WC_WR_FLUSH_ERR)
1998 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1999 }
2000
2001 isert_unmap_tx_desc(tx_desc, ib_dev);
2002 }
2003
2004 static void
2005 isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
2006 {
2007 struct isert_conn *isert_conn = wc->qp->qp_context;
2008 struct ib_device *ib_dev = isert_conn->cm_id->device;
2009 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
2010 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
2011
2012 if (unlikely(wc->status != IB_WC_SUCCESS)) {
2013 isert_print_wc(wc, "send");
2014 if (wc->status != IB_WC_WR_FLUSH_ERR)
2015 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2016 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
2017 return;
2018 }
2019
2020 isert_dbg("Cmd %p\n", isert_cmd);
2021
2022 switch (isert_cmd->iscsi_cmd->i_state) {
2023 case ISTATE_SEND_TASKMGTRSP:
2024 case ISTATE_SEND_LOGOUTRSP:
2025 case ISTATE_SEND_REJECT:
2026 case ISTATE_SEND_TEXTRSP:
2027 isert_unmap_tx_desc(tx_desc, ib_dev);
2028
2029 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
2030 queue_work(isert_comp_wq, &isert_cmd->comp_work);
2031 return;
2032 default:
2033 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
2034 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
2035 break;
2036 }
2037 }
2038
2039 static int
2040 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2041 {
2042 struct ib_send_wr *wr_failed;
2043 int ret;
2044
2045 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2046 if (ret) {
2047 isert_err("ib_post_recv failed with %d\n", ret);
2048 return ret;
2049 }
2050
2051 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2052 &wr_failed);
2053 if (ret) {
2054 isert_err("ib_post_send failed with %d\n", ret);
2055 return ret;
2056 }
2057 return ret;
2058 }
2059
2060 static int
2061 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2062 {
2063 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2064 struct isert_conn *isert_conn = conn->context;
2065 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2066 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2067 &isert_cmd->tx_desc.iscsi_header;
2068
2069 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2070 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2071 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2072 /*
2073 * Attach SENSE DATA payload to iSCSI Response PDU
2074 */
2075 if (cmd->se_cmd.sense_buffer &&
2076 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2077 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2078 struct isert_device *device = isert_conn->device;
2079 struct ib_device *ib_dev = device->ib_device;
2080 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2081 u32 padding, pdu_len;
2082
2083 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2084 cmd->sense_buffer);
2085 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2086
2087 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2088 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2089 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2090
2091 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2092 (void *)cmd->sense_buffer, pdu_len,
2093 DMA_TO_DEVICE);
2094
2095 isert_cmd->pdu_buf_len = pdu_len;
2096 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2097 tx_dsg->length = pdu_len;
2098 tx_dsg->lkey = device->pd->local_dma_lkey;
2099 isert_cmd->tx_desc.num_sge = 2;
2100 }
2101
2102 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2103
2104 isert_dbg("Posting SCSI Response\n");
2105
2106 return isert_post_response(isert_conn, isert_cmd);
2107 }
2108
2109 static void
2110 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2111 {
2112 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2113 struct isert_conn *isert_conn = conn->context;
2114 struct isert_device *device = isert_conn->device;
2115
2116 spin_lock_bh(&conn->cmd_lock);
2117 if (!list_empty(&cmd->i_conn_node))
2118 list_del_init(&cmd->i_conn_node);
2119 spin_unlock_bh(&conn->cmd_lock);
2120
2121 if (cmd->data_direction == DMA_TO_DEVICE)
2122 iscsit_stop_dataout_timer(cmd);
2123
2124 device->unreg_rdma_mem(isert_cmd, isert_conn);
2125 }
2126
2127 static enum target_prot_op
2128 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2129 {
2130 struct isert_conn *isert_conn = conn->context;
2131 struct isert_device *device = isert_conn->device;
2132
2133 if (conn->tpg->tpg_attrib.t10_pi) {
2134 if (device->pi_capable) {
2135 isert_info("conn %p PI offload enabled\n", isert_conn);
2136 isert_conn->pi_support = true;
2137 return TARGET_PROT_ALL;
2138 }
2139 }
2140
2141 isert_info("conn %p PI offload disabled\n", isert_conn);
2142 isert_conn->pi_support = false;
2143
2144 return TARGET_PROT_NORMAL;
2145 }
2146
2147 static int
2148 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2149 bool nopout_response)
2150 {
2151 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2152 struct isert_conn *isert_conn = conn->context;
2153 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2154
2155 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2156 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2157 &isert_cmd->tx_desc.iscsi_header,
2158 nopout_response);
2159 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2160 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2161
2162 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2163
2164 return isert_post_response(isert_conn, isert_cmd);
2165 }
2166
2167 static int
2168 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2169 {
2170 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2171 struct isert_conn *isert_conn = conn->context;
2172 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2173
2174 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2175 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2176 &isert_cmd->tx_desc.iscsi_header);
2177 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2178 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2179
2180 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2181
2182 return isert_post_response(isert_conn, isert_cmd);
2183 }
2184
2185 static int
2186 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2187 {
2188 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2189 struct isert_conn *isert_conn = conn->context;
2190 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2191
2192 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2193 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2194 &isert_cmd->tx_desc.iscsi_header);
2195 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2196 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2197
2198 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2199
2200 return isert_post_response(isert_conn, isert_cmd);
2201 }
2202
2203 static int
2204 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2205 {
2206 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2207 struct isert_conn *isert_conn = conn->context;
2208 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2209 struct isert_device *device = isert_conn->device;
2210 struct ib_device *ib_dev = device->ib_device;
2211 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2212 struct iscsi_reject *hdr =
2213 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2214
2215 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2216 iscsit_build_reject(cmd, conn, hdr);
2217 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2218
2219 hton24(hdr->dlength, ISCSI_HDR_LEN);
2220 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2221 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2222 DMA_TO_DEVICE);
2223 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2224 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2225 tx_dsg->length = ISCSI_HDR_LEN;
2226 tx_dsg->lkey = device->pd->local_dma_lkey;
2227 isert_cmd->tx_desc.num_sge = 2;
2228
2229 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2230
2231 isert_dbg("conn %p Posting Reject\n", isert_conn);
2232
2233 return isert_post_response(isert_conn, isert_cmd);
2234 }
2235
2236 static int
2237 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2238 {
2239 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2240 struct isert_conn *isert_conn = conn->context;
2241 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2242 struct iscsi_text_rsp *hdr =
2243 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2244 u32 txt_rsp_len;
2245 int rc;
2246
2247 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2248 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2249 if (rc < 0)
2250 return rc;
2251
2252 txt_rsp_len = rc;
2253 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2254
2255 if (txt_rsp_len) {
2256 struct isert_device *device = isert_conn->device;
2257 struct ib_device *ib_dev = device->ib_device;
2258 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2259 void *txt_rsp_buf = cmd->buf_ptr;
2260
2261 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2262 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2263
2264 isert_cmd->pdu_buf_len = txt_rsp_len;
2265 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2266 tx_dsg->length = txt_rsp_len;
2267 tx_dsg->lkey = device->pd->local_dma_lkey;
2268 isert_cmd->tx_desc.num_sge = 2;
2269 }
2270 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2271
2272 isert_dbg("conn %p Text Response\n", isert_conn);
2273
2274 return isert_post_response(isert_conn, isert_cmd);
2275 }
2276
2277 static int
2278 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2279 struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr,
2280 u32 data_left, u32 offset)
2281 {
2282 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2283 struct scatterlist *sg_start, *tmp_sg;
2284 struct isert_device *device = isert_conn->device;
2285 struct ib_device *ib_dev = device->ib_device;
2286 u32 sg_off, page_off;
2287 int i = 0, sg_nents;
2288
2289 sg_off = offset / PAGE_SIZE;
2290 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2291 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2292 page_off = offset % PAGE_SIZE;
2293
2294 rdma_wr->wr.sg_list = ib_sge;
2295 rdma_wr->wr.wr_cqe = &isert_cmd->tx_desc.tx_cqe;
2296
2297 /*
2298 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2299 */
2300 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2301 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2302 "page_off: %u\n",
2303 (unsigned long long)tmp_sg->dma_address,
2304 tmp_sg->length, page_off);
2305
2306 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2307 ib_sge->length = min_t(u32, data_left,
2308 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2309 ib_sge->lkey = device->pd->local_dma_lkey;
2310
2311 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2312 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2313 page_off = 0;
2314 data_left -= ib_sge->length;
2315 if (!data_left)
2316 break;
2317 ib_sge++;
2318 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2319 }
2320
2321 rdma_wr->wr.num_sge = ++i;
2322 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2323 rdma_wr->wr.sg_list, rdma_wr->wr.num_sge);
2324
2325 return rdma_wr->wr.num_sge;
2326 }
2327
2328 static int
2329 isert_map_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn)
2330 {
2331 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2332 struct se_cmd *se_cmd = &cmd->se_cmd;
2333 struct isert_conn *isert_conn = conn->context;
2334 struct isert_data_buf *data = &isert_cmd->data;
2335 struct ib_rdma_wr *rdma_wr;
2336 struct ib_sge *ib_sge;
2337 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2338 int ret = 0, i, ib_sge_cnt;
2339
2340 offset = isert_cmd->iser_ib_op == ISER_IB_RDMA_READ ?
2341 cmd->write_data_done : 0;
2342 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2343 se_cmd->t_data_nents, se_cmd->data_length,
2344 offset, isert_cmd->iser_ib_op,
2345 &isert_cmd->data);
2346 if (ret)
2347 return ret;
2348
2349 data_left = data->len;
2350 offset = data->offset;
2351
2352 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2353 if (!ib_sge) {
2354 isert_warn("Unable to allocate ib_sge\n");
2355 ret = -ENOMEM;
2356 goto unmap_cmd;
2357 }
2358 isert_cmd->ib_sge = ib_sge;
2359
2360 isert_cmd->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2361 isert_cmd->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) *
2362 isert_cmd->rdma_wr_num, GFP_KERNEL);
2363 if (!isert_cmd->rdma_wr) {
2364 isert_dbg("Unable to allocate isert_cmd->rdma_wr\n");
2365 ret = -ENOMEM;
2366 goto unmap_cmd;
2367 }
2368
2369 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2370
2371 for (i = 0; i < isert_cmd->rdma_wr_num; i++) {
2372 rdma_wr = &isert_cmd->rdma_wr[i];
2373 data_len = min(data_left, rdma_write_max);
2374
2375 rdma_wr->wr.send_flags = 0;
2376 if (isert_cmd->iser_ib_op == ISER_IB_RDMA_WRITE) {
2377 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2378
2379 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2380 rdma_wr->remote_addr = isert_cmd->read_va + offset;
2381 rdma_wr->rkey = isert_cmd->read_stag;
2382 if (i + 1 == isert_cmd->rdma_wr_num)
2383 rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr;
2384 else
2385 rdma_wr->wr.next = &isert_cmd->rdma_wr[i + 1].wr;
2386 } else {
2387 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2388
2389 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2390 rdma_wr->remote_addr = isert_cmd->write_va + va_offset;
2391 rdma_wr->rkey = isert_cmd->write_stag;
2392 if (i + 1 == isert_cmd->rdma_wr_num)
2393 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2394 else
2395 rdma_wr->wr.next = &isert_cmd->rdma_wr[i + 1].wr;
2396 }
2397
2398 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2399 rdma_wr, data_len, offset);
2400 ib_sge += ib_sge_cnt;
2401
2402 offset += data_len;
2403 va_offset += data_len;
2404 data_left -= data_len;
2405 }
2406
2407 return 0;
2408 unmap_cmd:
2409 isert_unmap_data_buf(isert_conn, data);
2410
2411 return ret;
2412 }
2413
2414 static inline void
2415 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2416 {
2417 u32 rkey;
2418
2419 memset(inv_wr, 0, sizeof(*inv_wr));
2420 inv_wr->wr_cqe = NULL;
2421 inv_wr->opcode = IB_WR_LOCAL_INV;
2422 inv_wr->ex.invalidate_rkey = mr->rkey;
2423
2424 /* Bump the key */
2425 rkey = ib_inc_rkey(mr->rkey);
2426 ib_update_fast_reg_key(mr, rkey);
2427 }
2428
2429 static int
2430 isert_fast_reg_mr(struct isert_conn *isert_conn,
2431 struct fast_reg_descriptor *fr_desc,
2432 struct isert_data_buf *mem,
2433 enum isert_indicator ind,
2434 struct ib_sge *sge)
2435 {
2436 struct isert_device *device = isert_conn->device;
2437 struct ib_device *ib_dev = device->ib_device;
2438 struct ib_mr *mr;
2439 struct ib_reg_wr reg_wr;
2440 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2441 int ret, n;
2442
2443 if (mem->dma_nents == 1) {
2444 sge->lkey = device->pd->local_dma_lkey;
2445 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2446 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2447 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2448 sge->addr, sge->length, sge->lkey);
2449 return 0;
2450 }
2451
2452 if (ind == ISERT_DATA_KEY_VALID)
2453 /* Registering data buffer */
2454 mr = fr_desc->data_mr;
2455 else
2456 /* Registering protection buffer */
2457 mr = fr_desc->pi_ctx->prot_mr;
2458
2459 if (!(fr_desc->ind & ind)) {
2460 isert_inv_rkey(&inv_wr, mr);
2461 wr = &inv_wr;
2462 }
2463
2464 n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE);
2465 if (unlikely(n != mem->nents)) {
2466 isert_err("failed to map mr sg (%d/%d)\n",
2467 n, mem->nents);
2468 return n < 0 ? n : -EINVAL;
2469 }
2470
2471 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2472 fr_desc, mem->nents, mem->offset);
2473
2474 reg_wr.wr.next = NULL;
2475 reg_wr.wr.opcode = IB_WR_REG_MR;
2476 reg_wr.wr.wr_cqe = NULL;
2477 reg_wr.wr.send_flags = 0;
2478 reg_wr.wr.num_sge = 0;
2479 reg_wr.mr = mr;
2480 reg_wr.key = mr->lkey;
2481 reg_wr.access = IB_ACCESS_LOCAL_WRITE;
2482
2483 if (!wr)
2484 wr = &reg_wr.wr;
2485 else
2486 wr->next = &reg_wr.wr;
2487
2488 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2489 if (ret) {
2490 isert_err("fast registration failed, ret:%d\n", ret);
2491 return ret;
2492 }
2493 fr_desc->ind &= ~ind;
2494
2495 sge->lkey = mr->lkey;
2496 sge->addr = mr->iova;
2497 sge->length = mr->length;
2498
2499 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2500 sge->addr, sge->length, sge->lkey);
2501
2502 return ret;
2503 }
2504
2505 static inline void
2506 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2507 struct ib_sig_domain *domain)
2508 {
2509 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2510 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2511 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2512 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2513 /*
2514 * At the moment we hard code those, but if in the future
2515 * the target core would like to use it, we will take it
2516 * from se_cmd.
2517 */
2518 domain->sig.dif.apptag_check_mask = 0xffff;
2519 domain->sig.dif.app_escape = true;
2520 domain->sig.dif.ref_escape = true;
2521 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2522 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2523 domain->sig.dif.ref_remap = true;
2524 };
2525
2526 static int
2527 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2528 {
2529 switch (se_cmd->prot_op) {
2530 case TARGET_PROT_DIN_INSERT:
2531 case TARGET_PROT_DOUT_STRIP:
2532 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2533 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2534 break;
2535 case TARGET_PROT_DOUT_INSERT:
2536 case TARGET_PROT_DIN_STRIP:
2537 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2538 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2539 break;
2540 case TARGET_PROT_DIN_PASS:
2541 case TARGET_PROT_DOUT_PASS:
2542 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2543 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2544 break;
2545 default:
2546 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2547 return -EINVAL;
2548 }
2549
2550 return 0;
2551 }
2552
2553 static inline u8
2554 isert_set_prot_checks(u8 prot_checks)
2555 {
2556 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2557 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2558 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2559 }
2560
2561 static int
2562 isert_reg_sig_mr(struct isert_conn *isert_conn,
2563 struct isert_cmd *isert_cmd,
2564 struct fast_reg_descriptor *fr_desc)
2565 {
2566 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2567 struct ib_sig_handover_wr sig_wr;
2568 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2569 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2570 struct ib_sig_attrs sig_attrs;
2571 int ret;
2572
2573 memset(&sig_attrs, 0, sizeof(sig_attrs));
2574 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2575 if (ret)
2576 goto err;
2577
2578 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2579
2580 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2581 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2582 wr = &inv_wr;
2583 }
2584
2585 memset(&sig_wr, 0, sizeof(sig_wr));
2586 sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
2587 sig_wr.wr.wr_cqe = NULL;
2588 sig_wr.wr.sg_list = &isert_cmd->ib_sg[DATA];
2589 sig_wr.wr.num_sge = 1;
2590 sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
2591 sig_wr.sig_attrs = &sig_attrs;
2592 sig_wr.sig_mr = pi_ctx->sig_mr;
2593 if (se_cmd->t_prot_sg)
2594 sig_wr.prot = &isert_cmd->ib_sg[PROT];
2595
2596 if (!wr)
2597 wr = &sig_wr.wr;
2598 else
2599 wr->next = &sig_wr.wr;
2600
2601 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2602 if (ret) {
2603 isert_err("fast registration failed, ret:%d\n", ret);
2604 goto err;
2605 }
2606 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2607
2608 isert_cmd->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2609 isert_cmd->ib_sg[SIG].addr = 0;
2610 isert_cmd->ib_sg[SIG].length = se_cmd->data_length;
2611 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2612 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2613 /*
2614 * We have protection guards on the wire
2615 * so we need to set a larget transfer
2616 */
2617 isert_cmd->ib_sg[SIG].length += se_cmd->prot_length;
2618
2619 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2620 isert_cmd->ib_sg[SIG].addr, isert_cmd->ib_sg[SIG].length,
2621 isert_cmd->ib_sg[SIG].lkey);
2622 err:
2623 return ret;
2624 }
2625
2626 static int
2627 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2628 struct isert_cmd *isert_cmd)
2629 {
2630 struct isert_device *device = isert_conn->device;
2631 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2632 int ret;
2633
2634 if (!isert_cmd->fr_desc->pi_ctx) {
2635 ret = isert_create_pi_ctx(isert_cmd->fr_desc,
2636 device->ib_device,
2637 device->pd);
2638 if (ret) {
2639 isert_err("conn %p failed to allocate pi_ctx\n",
2640 isert_conn);
2641 return ret;
2642 }
2643 }
2644
2645 if (se_cmd->t_prot_sg) {
2646 ret = isert_map_data_buf(isert_conn, isert_cmd,
2647 se_cmd->t_prot_sg,
2648 se_cmd->t_prot_nents,
2649 se_cmd->prot_length,
2650 0,
2651 isert_cmd->iser_ib_op,
2652 &isert_cmd->prot);
2653 if (ret) {
2654 isert_err("conn %p failed to map protection buffer\n",
2655 isert_conn);
2656 return ret;
2657 }
2658
2659 memset(&isert_cmd->ib_sg[PROT], 0, sizeof(isert_cmd->ib_sg[PROT]));
2660 ret = isert_fast_reg_mr(isert_conn, isert_cmd->fr_desc,
2661 &isert_cmd->prot,
2662 ISERT_PROT_KEY_VALID,
2663 &isert_cmd->ib_sg[PROT]);
2664 if (ret) {
2665 isert_err("conn %p failed to fast reg mr\n",
2666 isert_conn);
2667 goto unmap_prot_cmd;
2668 }
2669 }
2670
2671 ret = isert_reg_sig_mr(isert_conn, isert_cmd, isert_cmd->fr_desc);
2672 if (ret) {
2673 isert_err("conn %p failed to fast reg mr\n",
2674 isert_conn);
2675 goto unmap_prot_cmd;
2676 }
2677 isert_cmd->fr_desc->ind |= ISERT_PROTECTED;
2678
2679 return 0;
2680
2681 unmap_prot_cmd:
2682 if (se_cmd->t_prot_sg)
2683 isert_unmap_data_buf(isert_conn, &isert_cmd->prot);
2684
2685 return ret;
2686 }
2687
2688 static int
2689 isert_reg_rdma(struct isert_cmd *isert_cmd, struct iscsi_conn *conn)
2690 {
2691 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2692 struct se_cmd *se_cmd = &cmd->se_cmd;
2693 struct isert_conn *isert_conn = conn->context;
2694 struct fast_reg_descriptor *fr_desc = NULL;
2695 struct ib_rdma_wr *rdma_wr;
2696 struct ib_sge *ib_sg;
2697 u32 offset;
2698 int ret = 0;
2699 unsigned long flags;
2700
2701 offset = isert_cmd->iser_ib_op == ISER_IB_RDMA_READ ?
2702 cmd->write_data_done : 0;
2703 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2704 se_cmd->t_data_nents, se_cmd->data_length,
2705 offset, isert_cmd->iser_ib_op,
2706 &isert_cmd->data);
2707 if (ret)
2708 return ret;
2709
2710 if (isert_cmd->data.dma_nents != 1 ||
2711 isert_prot_cmd(isert_conn, se_cmd)) {
2712 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2713 fr_desc = list_first_entry(&isert_conn->fr_pool,
2714 struct fast_reg_descriptor, list);
2715 list_del(&fr_desc->list);
2716 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2717 isert_cmd->fr_desc = fr_desc;
2718 }
2719
2720 ret = isert_fast_reg_mr(isert_conn, fr_desc, &isert_cmd->data,
2721 ISERT_DATA_KEY_VALID, &isert_cmd->ib_sg[DATA]);
2722 if (ret)
2723 goto unmap_cmd;
2724
2725 if (isert_prot_cmd(isert_conn, se_cmd)) {
2726 ret = isert_handle_prot_cmd(isert_conn, isert_cmd);
2727 if (ret)
2728 goto unmap_cmd;
2729
2730 ib_sg = &isert_cmd->ib_sg[SIG];
2731 } else {
2732 ib_sg = &isert_cmd->ib_sg[DATA];
2733 }
2734
2735 memcpy(&isert_cmd->s_ib_sge, ib_sg, sizeof(*ib_sg));
2736 isert_cmd->ib_sge = &isert_cmd->s_ib_sge;
2737 isert_cmd->rdma_wr_num = 1;
2738 memset(&isert_cmd->s_rdma_wr, 0, sizeof(isert_cmd->s_rdma_wr));
2739 isert_cmd->rdma_wr = &isert_cmd->s_rdma_wr;
2740
2741 rdma_wr = &isert_cmd->s_rdma_wr;
2742 rdma_wr->wr.sg_list = &isert_cmd->s_ib_sge;
2743 rdma_wr->wr.num_sge = 1;
2744 rdma_wr->wr.wr_cqe = &isert_cmd->tx_desc.tx_cqe;
2745 if (isert_cmd->iser_ib_op == ISER_IB_RDMA_WRITE) {
2746 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2747
2748 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2749 rdma_wr->remote_addr = isert_cmd->read_va;
2750 rdma_wr->rkey = isert_cmd->read_stag;
2751 rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2752 0 : IB_SEND_SIGNALED;
2753 } else {
2754 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2755
2756 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2757 rdma_wr->remote_addr = isert_cmd->write_va;
2758 rdma_wr->rkey = isert_cmd->write_stag;
2759 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2760 }
2761
2762 return 0;
2763
2764 unmap_cmd:
2765 if (fr_desc) {
2766 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2767 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2768 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2769 }
2770 isert_unmap_data_buf(isert_conn, &isert_cmd->data);
2771
2772 return ret;
2773 }
2774
2775 static int
2776 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2777 {
2778 struct se_cmd *se_cmd = &cmd->se_cmd;
2779 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2780 struct isert_conn *isert_conn = conn->context;
2781 struct isert_device *device = isert_conn->device;
2782 struct ib_send_wr *wr_failed;
2783 int rc;
2784
2785 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2786 isert_cmd, se_cmd->data_length);
2787
2788 isert_cmd->iser_ib_op = ISER_IB_RDMA_WRITE;
2789 rc = device->reg_rdma_mem(isert_cmd, conn);
2790 if (rc) {
2791 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2792 return rc;
2793 }
2794
2795 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2796 /*
2797 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2798 */
2799 isert_create_send_desc(isert_conn, isert_cmd,
2800 &isert_cmd->tx_desc);
2801 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2802 &isert_cmd->tx_desc.iscsi_header);
2803 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2804 isert_init_send_wr(isert_conn, isert_cmd,
2805 &isert_cmd->tx_desc.send_wr);
2806 isert_cmd->s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr;
2807 isert_cmd->rdma_wr_num += 1;
2808
2809 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2810 if (rc) {
2811 isert_err("ib_post_recv failed with %d\n", rc);
2812 return rc;
2813 }
2814 }
2815
2816 rc = ib_post_send(isert_conn->qp, &isert_cmd->rdma_wr->wr, &wr_failed);
2817 if (rc)
2818 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2819
2820 if (!isert_prot_cmd(isert_conn, se_cmd))
2821 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2822 "READ\n", isert_cmd);
2823 else
2824 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2825 isert_cmd);
2826
2827 return 1;
2828 }
2829
2830 static int
2831 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2832 {
2833 struct se_cmd *se_cmd = &cmd->se_cmd;
2834 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2835 struct isert_conn *isert_conn = conn->context;
2836 struct isert_device *device = isert_conn->device;
2837 struct ib_send_wr *wr_failed;
2838 int rc;
2839
2840 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2841 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2842 isert_cmd->iser_ib_op = ISER_IB_RDMA_READ;
2843 rc = device->reg_rdma_mem(isert_cmd, conn);
2844 if (rc) {
2845 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2846 return rc;
2847 }
2848
2849 rc = ib_post_send(isert_conn->qp, &isert_cmd->rdma_wr->wr, &wr_failed);
2850 if (rc)
2851 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2852
2853 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2854 isert_cmd);
2855
2856 return 0;
2857 }
2858
2859 static int
2860 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2861 {
2862 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2863 int ret = 0;
2864
2865 switch (state) {
2866 case ISTATE_REMOVE:
2867 spin_lock_bh(&conn->cmd_lock);
2868 list_del_init(&cmd->i_conn_node);
2869 spin_unlock_bh(&conn->cmd_lock);
2870 isert_put_cmd(isert_cmd, true);
2871 break;
2872 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2873 ret = isert_put_nopin(cmd, conn, false);
2874 break;
2875 default:
2876 isert_err("Unknown immediate state: 0x%02x\n", state);
2877 ret = -EINVAL;
2878 break;
2879 }
2880
2881 return ret;
2882 }
2883
2884 static int
2885 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2886 {
2887 struct isert_conn *isert_conn = conn->context;
2888 int ret;
2889
2890 switch (state) {
2891 case ISTATE_SEND_LOGOUTRSP:
2892 ret = isert_put_logout_rsp(cmd, conn);
2893 if (!ret)
2894 isert_conn->logout_posted = true;
2895 break;
2896 case ISTATE_SEND_NOPIN:
2897 ret = isert_put_nopin(cmd, conn, true);
2898 break;
2899 case ISTATE_SEND_TASKMGTRSP:
2900 ret = isert_put_tm_rsp(cmd, conn);
2901 break;
2902 case ISTATE_SEND_REJECT:
2903 ret = isert_put_reject(cmd, conn);
2904 break;
2905 case ISTATE_SEND_TEXTRSP:
2906 ret = isert_put_text_rsp(cmd, conn);
2907 break;
2908 case ISTATE_SEND_STATUS:
2909 /*
2910 * Special case for sending non GOOD SCSI status from TX thread
2911 * context during pre se_cmd excecution failure.
2912 */
2913 ret = isert_put_response(conn, cmd);
2914 break;
2915 default:
2916 isert_err("Unknown response state: 0x%02x\n", state);
2917 ret = -EINVAL;
2918 break;
2919 }
2920
2921 return ret;
2922 }
2923
2924 struct rdma_cm_id *
2925 isert_setup_id(struct isert_np *isert_np)
2926 {
2927 struct iscsi_np *np = isert_np->np;
2928 struct rdma_cm_id *id;
2929 struct sockaddr *sa;
2930 int ret;
2931
2932 sa = (struct sockaddr *)&np->np_sockaddr;
2933 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2934
2935 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2936 RDMA_PS_TCP, IB_QPT_RC);
2937 if (IS_ERR(id)) {
2938 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2939 ret = PTR_ERR(id);
2940 goto out;
2941 }
2942 isert_dbg("id %p context %p\n", id, id->context);
2943
2944 ret = rdma_bind_addr(id, sa);
2945 if (ret) {
2946 isert_err("rdma_bind_addr() failed: %d\n", ret);
2947 goto out_id;
2948 }
2949
2950 ret = rdma_listen(id, 0);
2951 if (ret) {
2952 isert_err("rdma_listen() failed: %d\n", ret);
2953 goto out_id;
2954 }
2955
2956 return id;
2957 out_id:
2958 rdma_destroy_id(id);
2959 out:
2960 return ERR_PTR(ret);
2961 }
2962
2963 static int
2964 isert_setup_np(struct iscsi_np *np,
2965 struct sockaddr_storage *ksockaddr)
2966 {
2967 struct isert_np *isert_np;
2968 struct rdma_cm_id *isert_lid;
2969 int ret;
2970
2971 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2972 if (!isert_np) {
2973 isert_err("Unable to allocate struct isert_np\n");
2974 return -ENOMEM;
2975 }
2976 sema_init(&isert_np->sem, 0);
2977 mutex_init(&isert_np->mutex);
2978 INIT_LIST_HEAD(&isert_np->accepted);
2979 INIT_LIST_HEAD(&isert_np->pending);
2980 isert_np->np = np;
2981
2982 /*
2983 * Setup the np->np_sockaddr from the passed sockaddr setup
2984 * in iscsi_target_configfs.c code..
2985 */
2986 memcpy(&np->np_sockaddr, ksockaddr,
2987 sizeof(struct sockaddr_storage));
2988
2989 isert_lid = isert_setup_id(isert_np);
2990 if (IS_ERR(isert_lid)) {
2991 ret = PTR_ERR(isert_lid);
2992 goto out;
2993 }
2994
2995 isert_np->cm_id = isert_lid;
2996 np->np_context = isert_np;
2997
2998 return 0;
2999
3000 out:
3001 kfree(isert_np);
3002
3003 return ret;
3004 }
3005
3006 static int
3007 isert_rdma_accept(struct isert_conn *isert_conn)
3008 {
3009 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3010 struct rdma_conn_param cp;
3011 int ret;
3012 struct iser_cm_hdr rsp_hdr;
3013
3014 memset(&cp, 0, sizeof(struct rdma_conn_param));
3015 cp.initiator_depth = isert_conn->initiator_depth;
3016 cp.retry_count = 7;
3017 cp.rnr_retry_count = 7;
3018
3019 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
3020 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
3021 if (!isert_conn->snd_w_inv)
3022 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
3023 cp.private_data = (void *)&rsp_hdr;
3024 cp.private_data_len = sizeof(rsp_hdr);
3025
3026 ret = rdma_accept(cm_id, &cp);
3027 if (ret) {
3028 isert_err("rdma_accept() failed with: %d\n", ret);
3029 return ret;
3030 }
3031
3032 return 0;
3033 }
3034
3035 static int
3036 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3037 {
3038 struct isert_conn *isert_conn = conn->context;
3039 int ret;
3040
3041 isert_info("before login_req comp conn: %p\n", isert_conn);
3042 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3043 if (ret) {
3044 isert_err("isert_conn %p interrupted before got login req\n",
3045 isert_conn);
3046 return ret;
3047 }
3048 reinit_completion(&isert_conn->login_req_comp);
3049
3050 /*
3051 * For login requests after the first PDU, isert_rx_login_req() will
3052 * kick schedule_delayed_work(&conn->login_work) as the packet is
3053 * received, which turns this callback from iscsi_target_do_login_rx()
3054 * into a NOP.
3055 */
3056 if (!login->first_request)
3057 return 0;
3058
3059 isert_rx_login_req(isert_conn);
3060
3061 isert_info("before login_comp conn: %p\n", conn);
3062 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3063 if (ret)
3064 return ret;
3065
3066 isert_info("processing login->req: %p\n", login->req);
3067
3068 return 0;
3069 }
3070
3071 static void
3072 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3073 struct isert_conn *isert_conn)
3074 {
3075 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3076 struct rdma_route *cm_route = &cm_id->route;
3077
3078 conn->login_family = np->np_sockaddr.ss_family;
3079
3080 conn->login_sockaddr = cm_route->addr.dst_addr;
3081 conn->local_sockaddr = cm_route->addr.src_addr;
3082 }
3083
3084 static int
3085 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3086 {
3087 struct isert_np *isert_np = np->np_context;
3088 struct isert_conn *isert_conn;
3089 int ret;
3090
3091 accept_wait:
3092 ret = down_interruptible(&isert_np->sem);
3093 if (ret)
3094 return -ENODEV;
3095
3096 spin_lock_bh(&np->np_thread_lock);
3097 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3098 spin_unlock_bh(&np->np_thread_lock);
3099 isert_dbg("np_thread_state %d\n",
3100 np->np_thread_state);
3101 /**
3102 * No point in stalling here when np_thread
3103 * is in state RESET/SHUTDOWN/EXIT - bail
3104 **/
3105 return -ENODEV;
3106 }
3107 spin_unlock_bh(&np->np_thread_lock);
3108
3109 mutex_lock(&isert_np->mutex);
3110 if (list_empty(&isert_np->pending)) {
3111 mutex_unlock(&isert_np->mutex);
3112 goto accept_wait;
3113 }
3114 isert_conn = list_first_entry(&isert_np->pending,
3115 struct isert_conn, node);
3116 list_del_init(&isert_conn->node);
3117 mutex_unlock(&isert_np->mutex);
3118
3119 conn->context = isert_conn;
3120 isert_conn->conn = conn;
3121 isert_conn->state = ISER_CONN_BOUND;
3122
3123 isert_set_conn_info(np, conn, isert_conn);
3124
3125 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3126
3127 return 0;
3128 }
3129
3130 static void
3131 isert_free_np(struct iscsi_np *np)
3132 {
3133 struct isert_np *isert_np = np->np_context;
3134 struct isert_conn *isert_conn, *n;
3135
3136 if (isert_np->cm_id)
3137 rdma_destroy_id(isert_np->cm_id);
3138
3139 /*
3140 * FIXME: At this point we don't have a good way to insure
3141 * that at this point we don't have hanging connections that
3142 * completed RDMA establishment but didn't start iscsi login
3143 * process. So work-around this by cleaning up what ever piled
3144 * up in accepted and pending lists.
3145 */
3146 mutex_lock(&isert_np->mutex);
3147 if (!list_empty(&isert_np->pending)) {
3148 isert_info("Still have isert pending connections\n");
3149 list_for_each_entry_safe(isert_conn, n,
3150 &isert_np->pending,
3151 node) {
3152 isert_info("cleaning isert_conn %p state (%d)\n",
3153 isert_conn, isert_conn->state);
3154 isert_connect_release(isert_conn);
3155 }
3156 }
3157
3158 if (!list_empty(&isert_np->accepted)) {
3159 isert_info("Still have isert accepted connections\n");
3160 list_for_each_entry_safe(isert_conn, n,
3161 &isert_np->accepted,
3162 node) {
3163 isert_info("cleaning isert_conn %p state (%d)\n",
3164 isert_conn, isert_conn->state);
3165 isert_connect_release(isert_conn);
3166 }
3167 }
3168 mutex_unlock(&isert_np->mutex);
3169
3170 np->np_context = NULL;
3171 kfree(isert_np);
3172 }
3173
3174 static void isert_release_work(struct work_struct *work)
3175 {
3176 struct isert_conn *isert_conn = container_of(work,
3177 struct isert_conn,
3178 release_work);
3179
3180 isert_info("Starting release conn %p\n", isert_conn);
3181
3182 mutex_lock(&isert_conn->mutex);
3183 isert_conn->state = ISER_CONN_DOWN;
3184 mutex_unlock(&isert_conn->mutex);
3185
3186 isert_info("Destroying conn %p\n", isert_conn);
3187 isert_put_conn(isert_conn);
3188 }
3189
3190 static void
3191 isert_wait4logout(struct isert_conn *isert_conn)
3192 {
3193 struct iscsi_conn *conn = isert_conn->conn;
3194
3195 isert_info("conn %p\n", isert_conn);
3196
3197 if (isert_conn->logout_posted) {
3198 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3199 wait_for_completion_timeout(&conn->conn_logout_comp,
3200 SECONDS_FOR_LOGOUT_COMP * HZ);
3201 }
3202 }
3203
3204 static void
3205 isert_wait4cmds(struct iscsi_conn *conn)
3206 {
3207 isert_info("iscsi_conn %p\n", conn);
3208
3209 if (conn->sess) {
3210 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3211 target_wait_for_sess_cmds(conn->sess->se_sess);
3212 }
3213 }
3214
3215 /**
3216 * isert_put_unsol_pending_cmds() - Drop commands waiting for
3217 * unsolicitate dataout
3218 * @conn: iscsi connection
3219 *
3220 * We might still have commands that are waiting for unsolicited
3221 * dataouts messages. We must put the extra reference on those
3222 * before blocking on the target_wait_for_session_cmds
3223 */
3224 static void
3225 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3226 {
3227 struct iscsi_cmd *cmd, *tmp;
3228 static LIST_HEAD(drop_cmd_list);
3229
3230 spin_lock_bh(&conn->cmd_lock);
3231 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3232 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3233 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3234 (cmd->write_data_done < cmd->se_cmd.data_length))
3235 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3236 }
3237 spin_unlock_bh(&conn->cmd_lock);
3238
3239 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3240 list_del_init(&cmd->i_conn_node);
3241 if (cmd->i_state != ISTATE_REMOVE) {
3242 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3243
3244 isert_info("conn %p dropping cmd %p\n", conn, cmd);
3245 isert_put_cmd(isert_cmd, true);
3246 }
3247 }
3248 }
3249
3250 static void isert_wait_conn(struct iscsi_conn *conn)
3251 {
3252 struct isert_conn *isert_conn = conn->context;
3253
3254 isert_info("Starting conn %p\n", isert_conn);
3255
3256 mutex_lock(&isert_conn->mutex);
3257 isert_conn_terminate(isert_conn);
3258 mutex_unlock(&isert_conn->mutex);
3259
3260 ib_drain_qp(isert_conn->qp);
3261 isert_put_unsol_pending_cmds(conn);
3262 isert_wait4cmds(conn);
3263 isert_wait4logout(isert_conn);
3264
3265 queue_work(isert_release_wq, &isert_conn->release_work);
3266 }
3267
3268 static void isert_free_conn(struct iscsi_conn *conn)
3269 {
3270 struct isert_conn *isert_conn = conn->context;
3271
3272 ib_drain_qp(isert_conn->qp);
3273 isert_put_conn(isert_conn);
3274 }
3275
3276 static struct iscsit_transport iser_target_transport = {
3277 .name = "IB/iSER",
3278 .transport_type = ISCSI_INFINIBAND,
3279 .priv_size = sizeof(struct isert_cmd),
3280 .owner = THIS_MODULE,
3281 .iscsit_setup_np = isert_setup_np,
3282 .iscsit_accept_np = isert_accept_np,
3283 .iscsit_free_np = isert_free_np,
3284 .iscsit_wait_conn = isert_wait_conn,
3285 .iscsit_free_conn = isert_free_conn,
3286 .iscsit_get_login_rx = isert_get_login_rx,
3287 .iscsit_put_login_tx = isert_put_login_tx,
3288 .iscsit_immediate_queue = isert_immediate_queue,
3289 .iscsit_response_queue = isert_response_queue,
3290 .iscsit_get_dataout = isert_get_dataout,
3291 .iscsit_queue_data_in = isert_put_datain,
3292 .iscsit_queue_status = isert_put_response,
3293 .iscsit_aborted_task = isert_aborted_task,
3294 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3295 };
3296
3297 static int __init isert_init(void)
3298 {
3299 int ret;
3300
3301 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3302 WQ_UNBOUND | WQ_HIGHPRI, 0);
3303 if (!isert_comp_wq) {
3304 isert_err("Unable to allocate isert_comp_wq\n");
3305 ret = -ENOMEM;
3306 return -ENOMEM;
3307 }
3308
3309 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3310 WQ_UNBOUND_MAX_ACTIVE);
3311 if (!isert_release_wq) {
3312 isert_err("Unable to allocate isert_release_wq\n");
3313 ret = -ENOMEM;
3314 goto destroy_comp_wq;
3315 }
3316
3317 iscsit_register_transport(&iser_target_transport);
3318 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3319
3320 return 0;
3321
3322 destroy_comp_wq:
3323 destroy_workqueue(isert_comp_wq);
3324
3325 return ret;
3326 }
3327
3328 static void __exit isert_exit(void)
3329 {
3330 flush_scheduled_work();
3331 destroy_workqueue(isert_release_wq);
3332 destroy_workqueue(isert_comp_wq);
3333 iscsit_unregister_transport(&iser_target_transport);
3334 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3335 }
3336
3337 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3338 MODULE_VERSION("1.0");
3339 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3340 MODULE_LICENSE("GPL");
3341
3342 module_init(isert_init);
3343 module_exit(isert_exit);
Linux with added FPC-III support