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