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IB/mlx5: Unify CQ create flags check
[deliverable/linux.git] / drivers / infiniband / ulp / isert / ib_isert.c
1 /*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
18
19 #include <linux/string.h>
20 #include <linux/module.h>
21 #include <linux/scatterlist.h>
22 #include <linux/socket.h>
23 #include <linux/in.h>
24 #include <linux/in6.h>
25 #include <rdma/ib_verbs.h>
26 #include <rdma/rdma_cm.h>
27 #include <target/target_core_base.h>
28 #include <target/target_core_fabric.h>
29 #include <target/iscsi/iscsi_transport.h>
30 #include <linux/semaphore.h>
31
32 #include "ib_isert.h"
33
34 #define ISERT_MAX_CONN 8
35 #define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
36 #define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
37 #define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
38 ISERT_MAX_CONN)
39
40 static int isert_debug_level;
41 module_param_named(debug_level, isert_debug_level, int, 0644);
42 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
43
44 static DEFINE_MUTEX(device_list_mutex);
45 static LIST_HEAD(device_list);
46 static struct workqueue_struct *isert_comp_wq;
47 static struct workqueue_struct *isert_release_wq;
48
49 static void
50 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
51 static int
52 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
53 struct isert_rdma_wr *wr);
54 static void
55 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
56 static int
57 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
58 struct isert_rdma_wr *wr);
59 static int
60 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
61 static int
62 isert_rdma_post_recvl(struct isert_conn *isert_conn);
63 static int
64 isert_rdma_accept(struct isert_conn *isert_conn);
65 struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
66
67 static void isert_release_work(struct work_struct *work);
68
69 static inline bool
70 isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
71 {
72 return (conn->pi_support &&
73 cmd->prot_op != TARGET_PROT_NORMAL);
74 }
75
76
77 static void
78 isert_qp_event_callback(struct ib_event *e, void *context)
79 {
80 struct isert_conn *isert_conn = context;
81
82 isert_err("%s (%d): conn %p\n",
83 ib_event_msg(e->event), e->event, isert_conn);
84
85 switch (e->event) {
86 case IB_EVENT_COMM_EST:
87 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
88 break;
89 case IB_EVENT_QP_LAST_WQE_REACHED:
90 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
91 break;
92 default:
93 break;
94 }
95 }
96
97 static struct isert_comp *
98 isert_comp_get(struct isert_conn *isert_conn)
99 {
100 struct isert_device *device = isert_conn->device;
101 struct isert_comp *comp;
102 int i, min = 0;
103
104 mutex_lock(&device_list_mutex);
105 for (i = 0; i < device->comps_used; i++)
106 if (device->comps[i].active_qps <
107 device->comps[min].active_qps)
108 min = i;
109 comp = &device->comps[min];
110 comp->active_qps++;
111 mutex_unlock(&device_list_mutex);
112
113 isert_info("conn %p, using comp %p min_index: %d\n",
114 isert_conn, comp, min);
115
116 return comp;
117 }
118
119 static void
120 isert_comp_put(struct isert_comp *comp)
121 {
122 mutex_lock(&device_list_mutex);
123 comp->active_qps--;
124 mutex_unlock(&device_list_mutex);
125 }
126
127 static struct ib_qp *
128 isert_create_qp(struct isert_conn *isert_conn,
129 struct isert_comp *comp,
130 struct rdma_cm_id *cma_id)
131 {
132 struct isert_device *device = isert_conn->device;
133 struct ib_qp_init_attr attr;
134 int ret;
135
136 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
137 attr.event_handler = isert_qp_event_callback;
138 attr.qp_context = isert_conn;
139 attr.send_cq = comp->cq;
140 attr.recv_cq = comp->cq;
141 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
142 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
143 attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
144 isert_conn->max_sge = min(device->ib_device->attrs.max_sge,
145 device->ib_device->attrs.max_sge_rd);
146 attr.cap.max_recv_sge = 1;
147 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
148 attr.qp_type = IB_QPT_RC;
149 if (device->pi_capable)
150 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
151
152 ret = rdma_create_qp(cma_id, device->pd, &attr);
153 if (ret) {
154 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
155 return ERR_PTR(ret);
156 }
157
158 return cma_id->qp;
159 }
160
161 static int
162 isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
163 {
164 struct isert_comp *comp;
165 int ret;
166
167 comp = isert_comp_get(isert_conn);
168 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
169 if (IS_ERR(isert_conn->qp)) {
170 ret = PTR_ERR(isert_conn->qp);
171 goto err;
172 }
173
174 return 0;
175 err:
176 isert_comp_put(comp);
177 return ret;
178 }
179
180 static void
181 isert_cq_event_callback(struct ib_event *e, void *context)
182 {
183 isert_dbg("event: %d\n", e->event);
184 }
185
186 static int
187 isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
188 {
189 struct isert_device *device = isert_conn->device;
190 struct ib_device *ib_dev = device->ib_device;
191 struct iser_rx_desc *rx_desc;
192 struct ib_sge *rx_sg;
193 u64 dma_addr;
194 int i, j;
195
196 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
197 sizeof(struct iser_rx_desc), GFP_KERNEL);
198 if (!isert_conn->rx_descs)
199 goto fail;
200
201 rx_desc = isert_conn->rx_descs;
202
203 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
204 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
205 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
206 if (ib_dma_mapping_error(ib_dev, dma_addr))
207 goto dma_map_fail;
208
209 rx_desc->dma_addr = dma_addr;
210
211 rx_sg = &rx_desc->rx_sg;
212 rx_sg->addr = rx_desc->dma_addr;
213 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
214 rx_sg->lkey = device->pd->local_dma_lkey;
215 }
216
217 return 0;
218
219 dma_map_fail:
220 rx_desc = isert_conn->rx_descs;
221 for (j = 0; j < i; j++, rx_desc++) {
222 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
223 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
224 }
225 kfree(isert_conn->rx_descs);
226 isert_conn->rx_descs = NULL;
227 fail:
228 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
229
230 return -ENOMEM;
231 }
232
233 static void
234 isert_free_rx_descriptors(struct isert_conn *isert_conn)
235 {
236 struct ib_device *ib_dev = isert_conn->device->ib_device;
237 struct iser_rx_desc *rx_desc;
238 int i;
239
240 if (!isert_conn->rx_descs)
241 return;
242
243 rx_desc = isert_conn->rx_descs;
244 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
245 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
246 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
247 }
248
249 kfree(isert_conn->rx_descs);
250 isert_conn->rx_descs = NULL;
251 }
252
253 static void isert_cq_work(struct work_struct *);
254 static void isert_cq_callback(struct ib_cq *, void *);
255
256 static void
257 isert_free_comps(struct isert_device *device)
258 {
259 int i;
260
261 for (i = 0; i < device->comps_used; i++) {
262 struct isert_comp *comp = &device->comps[i];
263
264 if (comp->cq) {
265 cancel_work_sync(&comp->work);
266 ib_destroy_cq(comp->cq);
267 }
268 }
269 kfree(device->comps);
270 }
271
272 static int
273 isert_alloc_comps(struct isert_device *device)
274 {
275 int i, max_cqe, ret = 0;
276
277 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
278 device->ib_device->num_comp_vectors));
279
280 isert_info("Using %d CQs, %s supports %d vectors support "
281 "Fast registration %d pi_capable %d\n",
282 device->comps_used, device->ib_device->name,
283 device->ib_device->num_comp_vectors, device->use_fastreg,
284 device->pi_capable);
285
286 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
287 GFP_KERNEL);
288 if (!device->comps) {
289 isert_err("Unable to allocate completion contexts\n");
290 return -ENOMEM;
291 }
292
293 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
294
295 for (i = 0; i < device->comps_used; i++) {
296 struct ib_cq_init_attr cq_attr = {};
297 struct isert_comp *comp = &device->comps[i];
298
299 comp->device = device;
300 INIT_WORK(&comp->work, isert_cq_work);
301 cq_attr.cqe = max_cqe;
302 cq_attr.comp_vector = i;
303 comp->cq = ib_create_cq(device->ib_device,
304 isert_cq_callback,
305 isert_cq_event_callback,
306 (void *)comp,
307 &cq_attr);
308 if (IS_ERR(comp->cq)) {
309 isert_err("Unable to allocate cq\n");
310 ret = PTR_ERR(comp->cq);
311 comp->cq = NULL;
312 goto out_cq;
313 }
314
315 ret = ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
316 if (ret)
317 goto out_cq;
318 }
319
320 return 0;
321 out_cq:
322 isert_free_comps(device);
323 return ret;
324 }
325
326 static int
327 isert_create_device_ib_res(struct isert_device *device)
328 {
329 struct ib_device *ib_dev = device->ib_device;
330 int ret;
331
332 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
333 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
334
335 /* asign function handlers */
336 if (ib_dev->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
337 ib_dev->attrs.device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
338 device->use_fastreg = 1;
339 device->reg_rdma_mem = isert_reg_rdma;
340 device->unreg_rdma_mem = isert_unreg_rdma;
341 } else {
342 device->use_fastreg = 0;
343 device->reg_rdma_mem = isert_map_rdma;
344 device->unreg_rdma_mem = isert_unmap_cmd;
345 }
346
347 ret = isert_alloc_comps(device);
348 if (ret)
349 return ret;
350
351 device->pd = ib_alloc_pd(ib_dev);
352 if (IS_ERR(device->pd)) {
353 ret = PTR_ERR(device->pd);
354 isert_err("failed to allocate pd, device %p, ret=%d\n",
355 device, ret);
356 goto out_cq;
357 }
358
359 /* Check signature cap */
360 device->pi_capable = ib_dev->attrs.device_cap_flags &
361 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
362
363 return 0;
364
365 out_cq:
366 isert_free_comps(device);
367 return ret;
368 }
369
370 static void
371 isert_free_device_ib_res(struct isert_device *device)
372 {
373 isert_info("device %p\n", device);
374
375 ib_dealloc_pd(device->pd);
376 isert_free_comps(device);
377 }
378
379 static void
380 isert_device_put(struct isert_device *device)
381 {
382 mutex_lock(&device_list_mutex);
383 device->refcount--;
384 isert_info("device %p refcount %d\n", device, device->refcount);
385 if (!device->refcount) {
386 isert_free_device_ib_res(device);
387 list_del(&device->dev_node);
388 kfree(device);
389 }
390 mutex_unlock(&device_list_mutex);
391 }
392
393 static struct isert_device *
394 isert_device_get(struct rdma_cm_id *cma_id)
395 {
396 struct isert_device *device;
397 int ret;
398
399 mutex_lock(&device_list_mutex);
400 list_for_each_entry(device, &device_list, dev_node) {
401 if (device->ib_device->node_guid == cma_id->device->node_guid) {
402 device->refcount++;
403 isert_info("Found iser device %p refcount %d\n",
404 device, device->refcount);
405 mutex_unlock(&device_list_mutex);
406 return device;
407 }
408 }
409
410 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
411 if (!device) {
412 mutex_unlock(&device_list_mutex);
413 return ERR_PTR(-ENOMEM);
414 }
415
416 INIT_LIST_HEAD(&device->dev_node);
417
418 device->ib_device = cma_id->device;
419 ret = isert_create_device_ib_res(device);
420 if (ret) {
421 kfree(device);
422 mutex_unlock(&device_list_mutex);
423 return ERR_PTR(ret);
424 }
425
426 device->refcount++;
427 list_add_tail(&device->dev_node, &device_list);
428 isert_info("Created a new iser device %p refcount %d\n",
429 device, device->refcount);
430 mutex_unlock(&device_list_mutex);
431
432 return device;
433 }
434
435 static void
436 isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
437 {
438 struct fast_reg_descriptor *fr_desc, *tmp;
439 int i = 0;
440
441 if (list_empty(&isert_conn->fr_pool))
442 return;
443
444 isert_info("Freeing conn %p fastreg pool", isert_conn);
445
446 list_for_each_entry_safe(fr_desc, tmp,
447 &isert_conn->fr_pool, list) {
448 list_del(&fr_desc->list);
449 ib_dereg_mr(fr_desc->data_mr);
450 if (fr_desc->pi_ctx) {
451 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
452 ib_dereg_mr(fr_desc->pi_ctx->sig_mr);
453 kfree(fr_desc->pi_ctx);
454 }
455 kfree(fr_desc);
456 ++i;
457 }
458
459 if (i < isert_conn->fr_pool_size)
460 isert_warn("Pool still has %d regions registered\n",
461 isert_conn->fr_pool_size - i);
462 }
463
464 static int
465 isert_create_pi_ctx(struct fast_reg_descriptor *desc,
466 struct ib_device *device,
467 struct ib_pd *pd)
468 {
469 struct pi_context *pi_ctx;
470 int ret;
471
472 pi_ctx = kzalloc(sizeof(*desc->pi_ctx), GFP_KERNEL);
473 if (!pi_ctx) {
474 isert_err("Failed to allocate pi context\n");
475 return -ENOMEM;
476 }
477
478 pi_ctx->prot_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
479 ISCSI_ISER_SG_TABLESIZE);
480 if (IS_ERR(pi_ctx->prot_mr)) {
481 isert_err("Failed to allocate prot frmr err=%ld\n",
482 PTR_ERR(pi_ctx->prot_mr));
483 ret = PTR_ERR(pi_ctx->prot_mr);
484 goto err_pi_ctx;
485 }
486 desc->ind |= ISERT_PROT_KEY_VALID;
487
488 pi_ctx->sig_mr = ib_alloc_mr(pd, IB_MR_TYPE_SIGNATURE, 2);
489 if (IS_ERR(pi_ctx->sig_mr)) {
490 isert_err("Failed to allocate signature enabled mr err=%ld\n",
491 PTR_ERR(pi_ctx->sig_mr));
492 ret = PTR_ERR(pi_ctx->sig_mr);
493 goto err_prot_mr;
494 }
495
496 desc->pi_ctx = pi_ctx;
497 desc->ind |= ISERT_SIG_KEY_VALID;
498 desc->ind &= ~ISERT_PROTECTED;
499
500 return 0;
501
502 err_prot_mr:
503 ib_dereg_mr(pi_ctx->prot_mr);
504 err_pi_ctx:
505 kfree(pi_ctx);
506
507 return ret;
508 }
509
510 static int
511 isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
512 struct fast_reg_descriptor *fr_desc)
513 {
514 fr_desc->data_mr = ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG,
515 ISCSI_ISER_SG_TABLESIZE);
516 if (IS_ERR(fr_desc->data_mr)) {
517 isert_err("Failed to allocate data frmr err=%ld\n",
518 PTR_ERR(fr_desc->data_mr));
519 return PTR_ERR(fr_desc->data_mr);
520 }
521 fr_desc->ind |= ISERT_DATA_KEY_VALID;
522
523 isert_dbg("Created fr_desc %p\n", fr_desc);
524
525 return 0;
526 }
527
528 static int
529 isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
530 {
531 struct fast_reg_descriptor *fr_desc;
532 struct isert_device *device = isert_conn->device;
533 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
534 struct se_node_acl *se_nacl = se_sess->se_node_acl;
535 int i, ret, tag_num;
536 /*
537 * Setup the number of FRMRs based upon the number of tags
538 * available to session in iscsi_target_locate_portal().
539 */
540 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
541 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
542
543 isert_conn->fr_pool_size = 0;
544 for (i = 0; i < tag_num; i++) {
545 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
546 if (!fr_desc) {
547 isert_err("Failed to allocate fast_reg descriptor\n");
548 ret = -ENOMEM;
549 goto err;
550 }
551
552 ret = isert_create_fr_desc(device->ib_device,
553 device->pd, fr_desc);
554 if (ret) {
555 isert_err("Failed to create fastreg descriptor err=%d\n",
556 ret);
557 kfree(fr_desc);
558 goto err;
559 }
560
561 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
562 isert_conn->fr_pool_size++;
563 }
564
565 isert_dbg("Creating conn %p fastreg pool size=%d",
566 isert_conn, isert_conn->fr_pool_size);
567
568 return 0;
569
570 err:
571 isert_conn_free_fastreg_pool(isert_conn);
572 return ret;
573 }
574
575 static void
576 isert_init_conn(struct isert_conn *isert_conn)
577 {
578 isert_conn->state = ISER_CONN_INIT;
579 INIT_LIST_HEAD(&isert_conn->node);
580 init_completion(&isert_conn->login_comp);
581 init_completion(&isert_conn->login_req_comp);
582 init_completion(&isert_conn->wait);
583 kref_init(&isert_conn->kref);
584 mutex_init(&isert_conn->mutex);
585 spin_lock_init(&isert_conn->pool_lock);
586 INIT_LIST_HEAD(&isert_conn->fr_pool);
587 INIT_WORK(&isert_conn->release_work, isert_release_work);
588 }
589
590 static void
591 isert_free_login_buf(struct isert_conn *isert_conn)
592 {
593 struct ib_device *ib_dev = isert_conn->device->ib_device;
594
595 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
596 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
597 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
598 ISCSI_DEF_MAX_RECV_SEG_LEN,
599 DMA_FROM_DEVICE);
600 kfree(isert_conn->login_buf);
601 }
602
603 static int
604 isert_alloc_login_buf(struct isert_conn *isert_conn,
605 struct ib_device *ib_dev)
606 {
607 int ret;
608
609 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
610 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
611 if (!isert_conn->login_buf) {
612 isert_err("Unable to allocate isert_conn->login_buf\n");
613 return -ENOMEM;
614 }
615
616 isert_conn->login_req_buf = isert_conn->login_buf;
617 isert_conn->login_rsp_buf = isert_conn->login_buf +
618 ISCSI_DEF_MAX_RECV_SEG_LEN;
619
620 isert_dbg("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
621 isert_conn->login_buf, isert_conn->login_req_buf,
622 isert_conn->login_rsp_buf);
623
624 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
625 (void *)isert_conn->login_req_buf,
626 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
627
628 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
629 if (ret) {
630 isert_err("login_req_dma mapping error: %d\n", ret);
631 isert_conn->login_req_dma = 0;
632 goto out_login_buf;
633 }
634
635 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
636 (void *)isert_conn->login_rsp_buf,
637 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
638
639 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
640 if (ret) {
641 isert_err("login_rsp_dma mapping error: %d\n", ret);
642 isert_conn->login_rsp_dma = 0;
643 goto out_req_dma_map;
644 }
645
646 return 0;
647
648 out_req_dma_map:
649 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
650 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
651 out_login_buf:
652 kfree(isert_conn->login_buf);
653 return ret;
654 }
655
656 static void
657 isert_set_nego_params(struct isert_conn *isert_conn,
658 struct rdma_conn_param *param)
659 {
660 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
661
662 /* Set max inflight RDMA READ requests */
663 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
664 attr->max_qp_init_rd_atom);
665 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
666
667 if (param->private_data) {
668 u8 flags = *(u8 *)param->private_data;
669
670 /*
671 * use remote invalidation if the both initiator
672 * and the HCA support it
673 */
674 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
675 (attr->device_cap_flags &
676 IB_DEVICE_MEM_MGT_EXTENSIONS);
677 if (isert_conn->snd_w_inv)
678 isert_info("Using remote invalidation\n");
679 }
680 }
681
682 static int
683 isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
684 {
685 struct isert_np *isert_np = cma_id->context;
686 struct iscsi_np *np = isert_np->np;
687 struct isert_conn *isert_conn;
688 struct isert_device *device;
689 int ret = 0;
690
691 spin_lock_bh(&np->np_thread_lock);
692 if (!np->enabled) {
693 spin_unlock_bh(&np->np_thread_lock);
694 isert_dbg("iscsi_np is not enabled, reject connect request\n");
695 return rdma_reject(cma_id, NULL, 0);
696 }
697 spin_unlock_bh(&np->np_thread_lock);
698
699 isert_dbg("cma_id: %p, portal: %p\n",
700 cma_id, cma_id->context);
701
702 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
703 if (!isert_conn)
704 return -ENOMEM;
705
706 isert_init_conn(isert_conn);
707 isert_conn->cm_id = cma_id;
708
709 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
710 if (ret)
711 goto out;
712
713 device = isert_device_get(cma_id);
714 if (IS_ERR(device)) {
715 ret = PTR_ERR(device);
716 goto out_rsp_dma_map;
717 }
718 isert_conn->device = device;
719
720 isert_set_nego_params(isert_conn, &event->param.conn);
721
722 ret = isert_conn_setup_qp(isert_conn, cma_id);
723 if (ret)
724 goto out_conn_dev;
725
726 ret = isert_rdma_post_recvl(isert_conn);
727 if (ret)
728 goto out_conn_dev;
729
730 ret = isert_rdma_accept(isert_conn);
731 if (ret)
732 goto out_conn_dev;
733
734 mutex_lock(&isert_np->mutex);
735 list_add_tail(&isert_conn->node, &isert_np->accepted);
736 mutex_unlock(&isert_np->mutex);
737
738 return 0;
739
740 out_conn_dev:
741 isert_device_put(device);
742 out_rsp_dma_map:
743 isert_free_login_buf(isert_conn);
744 out:
745 kfree(isert_conn);
746 rdma_reject(cma_id, NULL, 0);
747 return ret;
748 }
749
750 static void
751 isert_connect_release(struct isert_conn *isert_conn)
752 {
753 struct isert_device *device = isert_conn->device;
754
755 isert_dbg("conn %p\n", isert_conn);
756
757 BUG_ON(!device);
758
759 if (device->use_fastreg)
760 isert_conn_free_fastreg_pool(isert_conn);
761
762 isert_free_rx_descriptors(isert_conn);
763 if (isert_conn->cm_id)
764 rdma_destroy_id(isert_conn->cm_id);
765
766 if (isert_conn->qp) {
767 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
768
769 isert_comp_put(comp);
770 ib_destroy_qp(isert_conn->qp);
771 }
772
773 if (isert_conn->login_buf)
774 isert_free_login_buf(isert_conn);
775
776 isert_device_put(device);
777
778 kfree(isert_conn);
779 }
780
781 static void
782 isert_connected_handler(struct rdma_cm_id *cma_id)
783 {
784 struct isert_conn *isert_conn = cma_id->qp->qp_context;
785 struct isert_np *isert_np = cma_id->context;
786
787 isert_info("conn %p\n", isert_conn);
788
789 mutex_lock(&isert_conn->mutex);
790 isert_conn->state = ISER_CONN_UP;
791 kref_get(&isert_conn->kref);
792 mutex_unlock(&isert_conn->mutex);
793
794 mutex_lock(&isert_np->mutex);
795 list_move_tail(&isert_conn->node, &isert_np->pending);
796 mutex_unlock(&isert_np->mutex);
797
798 isert_info("np %p: Allow accept_np to continue\n", isert_np);
799 up(&isert_np->sem);
800 }
801
802 static void
803 isert_release_kref(struct kref *kref)
804 {
805 struct isert_conn *isert_conn = container_of(kref,
806 struct isert_conn, kref);
807
808 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
809 current->pid);
810
811 isert_connect_release(isert_conn);
812 }
813
814 static void
815 isert_put_conn(struct isert_conn *isert_conn)
816 {
817 kref_put(&isert_conn->kref, isert_release_kref);
818 }
819
820 /**
821 * isert_conn_terminate() - Initiate connection termination
822 * @isert_conn: isert connection struct
823 *
824 * Notes:
825 * In case the connection state is FULL_FEATURE, move state
826 * to TEMINATING and start teardown sequence (rdma_disconnect).
827 * In case the connection state is UP, complete flush as well.
828 *
829 * This routine must be called with mutex held. Thus it is
830 * safe to call multiple times.
831 */
832 static void
833 isert_conn_terminate(struct isert_conn *isert_conn)
834 {
835 int err;
836
837 switch (isert_conn->state) {
838 case ISER_CONN_TERMINATING:
839 break;
840 case ISER_CONN_UP:
841 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
842 isert_info("Terminating conn %p state %d\n",
843 isert_conn, isert_conn->state);
844 isert_conn->state = ISER_CONN_TERMINATING;
845 err = rdma_disconnect(isert_conn->cm_id);
846 if (err)
847 isert_warn("Failed rdma_disconnect isert_conn %p\n",
848 isert_conn);
849 break;
850 default:
851 isert_warn("conn %p teminating in state %d\n",
852 isert_conn, isert_conn->state);
853 }
854 }
855
856 static int
857 isert_np_cma_handler(struct isert_np *isert_np,
858 enum rdma_cm_event_type event)
859 {
860 isert_dbg("%s (%d): isert np %p\n",
861 rdma_event_msg(event), event, isert_np);
862
863 switch (event) {
864 case RDMA_CM_EVENT_DEVICE_REMOVAL:
865 isert_np->cm_id = NULL;
866 break;
867 case RDMA_CM_EVENT_ADDR_CHANGE:
868 isert_np->cm_id = isert_setup_id(isert_np);
869 if (IS_ERR(isert_np->cm_id)) {
870 isert_err("isert np %p setup id failed: %ld\n",
871 isert_np, PTR_ERR(isert_np->cm_id));
872 isert_np->cm_id = NULL;
873 }
874 break;
875 default:
876 isert_err("isert np %p Unexpected event %d\n",
877 isert_np, event);
878 }
879
880 return -1;
881 }
882
883 static int
884 isert_disconnected_handler(struct rdma_cm_id *cma_id,
885 enum rdma_cm_event_type event)
886 {
887 struct isert_np *isert_np = cma_id->context;
888 struct isert_conn *isert_conn;
889 bool terminating = false;
890
891 if (isert_np->cm_id == cma_id)
892 return isert_np_cma_handler(cma_id->context, event);
893
894 isert_conn = cma_id->qp->qp_context;
895
896 mutex_lock(&isert_conn->mutex);
897 terminating = (isert_conn->state == ISER_CONN_TERMINATING);
898 isert_conn_terminate(isert_conn);
899 mutex_unlock(&isert_conn->mutex);
900
901 isert_info("conn %p completing wait\n", isert_conn);
902 complete(&isert_conn->wait);
903
904 if (terminating)
905 goto out;
906
907 mutex_lock(&isert_np->mutex);
908 if (!list_empty(&isert_conn->node)) {
909 list_del_init(&isert_conn->node);
910 isert_put_conn(isert_conn);
911 queue_work(isert_release_wq, &isert_conn->release_work);
912 }
913 mutex_unlock(&isert_np->mutex);
914
915 out:
916 return 0;
917 }
918
919 static int
920 isert_connect_error(struct rdma_cm_id *cma_id)
921 {
922 struct isert_conn *isert_conn = cma_id->qp->qp_context;
923
924 list_del_init(&isert_conn->node);
925 isert_conn->cm_id = NULL;
926 isert_put_conn(isert_conn);
927
928 return -1;
929 }
930
931 static int
932 isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
933 {
934 int ret = 0;
935
936 isert_info("%s (%d): status %d id %p np %p\n",
937 rdma_event_msg(event->event), event->event,
938 event->status, cma_id, cma_id->context);
939
940 switch (event->event) {
941 case RDMA_CM_EVENT_CONNECT_REQUEST:
942 ret = isert_connect_request(cma_id, event);
943 if (ret)
944 isert_err("failed handle connect request %d\n", ret);
945 break;
946 case RDMA_CM_EVENT_ESTABLISHED:
947 isert_connected_handler(cma_id);
948 break;
949 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
950 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
951 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
952 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
953 ret = isert_disconnected_handler(cma_id, event->event);
954 break;
955 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
956 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
957 case RDMA_CM_EVENT_CONNECT_ERROR:
958 ret = isert_connect_error(cma_id);
959 break;
960 default:
961 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
962 break;
963 }
964
965 return ret;
966 }
967
968 static int
969 isert_post_recvm(struct isert_conn *isert_conn, u32 count)
970 {
971 struct ib_recv_wr *rx_wr, *rx_wr_failed;
972 int i, ret;
973 struct iser_rx_desc *rx_desc;
974
975 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
976 rx_desc = &isert_conn->rx_descs[i];
977 rx_wr->wr_id = (uintptr_t)rx_desc;
978 rx_wr->sg_list = &rx_desc->rx_sg;
979 rx_wr->num_sge = 1;
980 rx_wr->next = rx_wr + 1;
981 }
982 rx_wr--;
983 rx_wr->next = NULL; /* mark end of work requests list */
984
985 isert_conn->post_recv_buf_count += count;
986 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
987 &rx_wr_failed);
988 if (ret) {
989 isert_err("ib_post_recv() failed with ret: %d\n", ret);
990 isert_conn->post_recv_buf_count -= count;
991 }
992
993 return ret;
994 }
995
996 static int
997 isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
998 {
999 struct ib_recv_wr *rx_wr_failed, rx_wr;
1000 int ret;
1001
1002 rx_wr.wr_id = (uintptr_t)rx_desc;
1003 rx_wr.sg_list = &rx_desc->rx_sg;
1004 rx_wr.num_sge = 1;
1005 rx_wr.next = NULL;
1006
1007 isert_conn->post_recv_buf_count++;
1008 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
1009 if (ret) {
1010 isert_err("ib_post_recv() failed with ret: %d\n", ret);
1011 isert_conn->post_recv_buf_count--;
1012 }
1013
1014 return ret;
1015 }
1016
1017 static int
1018 isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
1019 {
1020 struct ib_device *ib_dev = isert_conn->cm_id->device;
1021 struct ib_send_wr send_wr, *send_wr_failed;
1022 int ret;
1023
1024 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
1025 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1026
1027 send_wr.next = NULL;
1028 send_wr.wr_id = (uintptr_t)tx_desc;
1029 send_wr.sg_list = tx_desc->tx_sg;
1030 send_wr.num_sge = tx_desc->num_sge;
1031 send_wr.opcode = IB_WR_SEND;
1032 send_wr.send_flags = IB_SEND_SIGNALED;
1033
1034 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
1035 if (ret)
1036 isert_err("ib_post_send() failed, ret: %d\n", ret);
1037
1038 return ret;
1039 }
1040
1041 static void
1042 isert_create_send_desc(struct isert_conn *isert_conn,
1043 struct isert_cmd *isert_cmd,
1044 struct iser_tx_desc *tx_desc)
1045 {
1046 struct isert_device *device = isert_conn->device;
1047 struct ib_device *ib_dev = device->ib_device;
1048
1049 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
1050 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1051
1052 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
1053 tx_desc->iser_header.flags = ISCSI_CTRL;
1054
1055 tx_desc->num_sge = 1;
1056 tx_desc->isert_cmd = isert_cmd;
1057
1058 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
1059 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1060 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
1061 }
1062 }
1063
1064 static int
1065 isert_init_tx_hdrs(struct isert_conn *isert_conn,
1066 struct iser_tx_desc *tx_desc)
1067 {
1068 struct isert_device *device = isert_conn->device;
1069 struct ib_device *ib_dev = device->ib_device;
1070 u64 dma_addr;
1071
1072 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
1073 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1074 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
1075 isert_err("ib_dma_mapping_error() failed\n");
1076 return -ENOMEM;
1077 }
1078
1079 tx_desc->dma_addr = dma_addr;
1080 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
1081 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
1082 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
1083
1084 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
1085 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
1086 tx_desc->tx_sg[0].lkey);
1087
1088 return 0;
1089 }
1090
1091 static void
1092 isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1093 struct ib_send_wr *send_wr)
1094 {
1095 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
1096
1097 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
1098 send_wr->wr_id = (uintptr_t)&isert_cmd->tx_desc;
1099
1100 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
1101 send_wr->opcode = IB_WR_SEND_WITH_INV;
1102 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
1103 } else {
1104 send_wr->opcode = IB_WR_SEND;
1105 }
1106
1107 send_wr->sg_list = &tx_desc->tx_sg[0];
1108 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
1109 send_wr->send_flags = IB_SEND_SIGNALED;
1110 }
1111
1112 static int
1113 isert_rdma_post_recvl(struct isert_conn *isert_conn)
1114 {
1115 struct ib_recv_wr rx_wr, *rx_wr_fail;
1116 struct ib_sge sge;
1117 int ret;
1118
1119 memset(&sge, 0, sizeof(struct ib_sge));
1120 sge.addr = isert_conn->login_req_dma;
1121 sge.length = ISER_RX_LOGIN_SIZE;
1122 sge.lkey = isert_conn->device->pd->local_dma_lkey;
1123
1124 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
1125 sge.addr, sge.length, sge.lkey);
1126
1127 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1128 rx_wr.wr_id = (uintptr_t)isert_conn->login_req_buf;
1129 rx_wr.sg_list = &sge;
1130 rx_wr.num_sge = 1;
1131
1132 isert_conn->post_recv_buf_count++;
1133 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
1134 if (ret) {
1135 isert_err("ib_post_recv() failed: %d\n", ret);
1136 isert_conn->post_recv_buf_count--;
1137 }
1138
1139 return ret;
1140 }
1141
1142 static int
1143 isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1144 u32 length)
1145 {
1146 struct isert_conn *isert_conn = conn->context;
1147 struct isert_device *device = isert_conn->device;
1148 struct ib_device *ib_dev = device->ib_device;
1149 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
1150 int ret;
1151
1152 isert_create_send_desc(isert_conn, NULL, tx_desc);
1153
1154 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1155 sizeof(struct iscsi_hdr));
1156
1157 isert_init_tx_hdrs(isert_conn, tx_desc);
1158
1159 if (length > 0) {
1160 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1161
1162 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1163 length, DMA_TO_DEVICE);
1164
1165 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1166
1167 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1168 length, DMA_TO_DEVICE);
1169
1170 tx_dsg->addr = isert_conn->login_rsp_dma;
1171 tx_dsg->length = length;
1172 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1173 tx_desc->num_sge = 2;
1174 }
1175 if (!login->login_failed) {
1176 if (login->login_complete) {
1177 if (!conn->sess->sess_ops->SessionType &&
1178 isert_conn->device->use_fastreg) {
1179 ret = isert_conn_create_fastreg_pool(isert_conn);
1180 if (ret) {
1181 isert_err("Conn: %p failed to create"
1182 " fastreg pool\n", isert_conn);
1183 return ret;
1184 }
1185 }
1186
1187 ret = isert_alloc_rx_descriptors(isert_conn);
1188 if (ret)
1189 return ret;
1190
1191 ret = isert_post_recvm(isert_conn,
1192 ISERT_QP_MAX_RECV_DTOS);
1193 if (ret)
1194 return ret;
1195
1196 /* Now we are in FULL_FEATURE phase */
1197 mutex_lock(&isert_conn->mutex);
1198 isert_conn->state = ISER_CONN_FULL_FEATURE;
1199 mutex_unlock(&isert_conn->mutex);
1200 goto post_send;
1201 }
1202
1203 ret = isert_rdma_post_recvl(isert_conn);
1204 if (ret)
1205 return ret;
1206 }
1207 post_send:
1208 ret = isert_post_send(isert_conn, tx_desc);
1209 if (ret)
1210 return ret;
1211
1212 return 0;
1213 }
1214
1215 static void
1216 isert_rx_login_req(struct isert_conn *isert_conn)
1217 {
1218 struct iser_rx_desc *rx_desc = (void *)isert_conn->login_req_buf;
1219 int rx_buflen = isert_conn->login_req_len;
1220 struct iscsi_conn *conn = isert_conn->conn;
1221 struct iscsi_login *login = conn->conn_login;
1222 int size;
1223
1224 isert_info("conn %p\n", isert_conn);
1225
1226 WARN_ON_ONCE(!login);
1227
1228 if (login->first_request) {
1229 struct iscsi_login_req *login_req =
1230 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1231 /*
1232 * Setup the initial iscsi_login values from the leading
1233 * login request PDU.
1234 */
1235 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1236 login->current_stage =
1237 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1238 >> 2;
1239 login->version_min = login_req->min_version;
1240 login->version_max = login_req->max_version;
1241 memcpy(login->isid, login_req->isid, 6);
1242 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1243 login->init_task_tag = login_req->itt;
1244 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1245 login->cid = be16_to_cpu(login_req->cid);
1246 login->tsih = be16_to_cpu(login_req->tsih);
1247 }
1248
1249 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1250
1251 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1252 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1253 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1254 MAX_KEY_VALUE_PAIRS);
1255 memcpy(login->req_buf, &rx_desc->data[0], size);
1256
1257 if (login->first_request) {
1258 complete(&isert_conn->login_comp);
1259 return;
1260 }
1261 schedule_delayed_work(&conn->login_work, 0);
1262 }
1263
1264 static struct iscsi_cmd
1265 *isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1266 {
1267 struct isert_conn *isert_conn = conn->context;
1268 struct isert_cmd *isert_cmd;
1269 struct iscsi_cmd *cmd;
1270
1271 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1272 if (!cmd) {
1273 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1274 return NULL;
1275 }
1276 isert_cmd = iscsit_priv_cmd(cmd);
1277 isert_cmd->conn = isert_conn;
1278 isert_cmd->iscsi_cmd = cmd;
1279 isert_cmd->rx_desc = rx_desc;
1280
1281 return cmd;
1282 }
1283
1284 static int
1285 isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1286 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1287 struct iser_rx_desc *rx_desc, unsigned char *buf)
1288 {
1289 struct iscsi_conn *conn = isert_conn->conn;
1290 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1291 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1292 bool dump_payload = false;
1293 unsigned int data_len;
1294
1295 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1296 if (rc < 0)
1297 return rc;
1298
1299 imm_data = cmd->immediate_data;
1300 imm_data_len = cmd->first_burst_len;
1301 unsol_data = cmd->unsolicited_data;
1302 data_len = cmd->se_cmd.data_length;
1303
1304 if (imm_data && imm_data_len == data_len)
1305 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1306 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1307 if (rc < 0) {
1308 return 0;
1309 } else if (rc > 0) {
1310 dump_payload = true;
1311 goto sequence_cmd;
1312 }
1313
1314 if (!imm_data)
1315 return 0;
1316
1317 if (imm_data_len != data_len) {
1318 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1319 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1320 &rx_desc->data[0], imm_data_len);
1321 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1322 sg_nents, imm_data_len);
1323 } else {
1324 sg_init_table(&isert_cmd->sg, 1);
1325 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1326 cmd->se_cmd.t_data_nents = 1;
1327 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1328 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1329 imm_data_len);
1330 }
1331
1332 cmd->write_data_done += imm_data_len;
1333
1334 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1335 spin_lock_bh(&cmd->istate_lock);
1336 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1337 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1338 spin_unlock_bh(&cmd->istate_lock);
1339 }
1340
1341 sequence_cmd:
1342 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1343
1344 if (!rc && dump_payload == false && unsol_data)
1345 iscsit_set_unsoliticed_dataout(cmd);
1346 else if (dump_payload && imm_data)
1347 target_put_sess_cmd(&cmd->se_cmd);
1348
1349 return 0;
1350 }
1351
1352 static int
1353 isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1354 struct iser_rx_desc *rx_desc, unsigned char *buf)
1355 {
1356 struct scatterlist *sg_start;
1357 struct iscsi_conn *conn = isert_conn->conn;
1358 struct iscsi_cmd *cmd = NULL;
1359 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1360 u32 unsol_data_len = ntoh24(hdr->dlength);
1361 int rc, sg_nents, sg_off, page_off;
1362
1363 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1364 if (rc < 0)
1365 return rc;
1366 else if (!cmd)
1367 return 0;
1368 /*
1369 * FIXME: Unexpected unsolicited_data out
1370 */
1371 if (!cmd->unsolicited_data) {
1372 isert_err("Received unexpected solicited data payload\n");
1373 dump_stack();
1374 return -1;
1375 }
1376
1377 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1378 "write_data_done: %u, data_length: %u\n",
1379 unsol_data_len, cmd->write_data_done,
1380 cmd->se_cmd.data_length);
1381
1382 sg_off = cmd->write_data_done / PAGE_SIZE;
1383 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1384 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1385 page_off = cmd->write_data_done % PAGE_SIZE;
1386 /*
1387 * FIXME: Non page-aligned unsolicited_data out
1388 */
1389 if (page_off) {
1390 isert_err("unexpected non-page aligned data payload\n");
1391 dump_stack();
1392 return -1;
1393 }
1394 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1395 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1396 sg_nents, &rx_desc->data[0], unsol_data_len);
1397
1398 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1399 unsol_data_len);
1400
1401 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1402 if (rc < 0)
1403 return rc;
1404
1405 /*
1406 * multiple data-outs on the same command can arrive -
1407 * so post the buffer before hand
1408 */
1409 rc = isert_post_recv(isert_conn, rx_desc);
1410 if (rc) {
1411 isert_err("ib_post_recv failed with %d\n", rc);
1412 return rc;
1413 }
1414 return 0;
1415 }
1416
1417 static int
1418 isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1419 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1420 unsigned char *buf)
1421 {
1422 struct iscsi_conn *conn = isert_conn->conn;
1423 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1424 int rc;
1425
1426 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1427 if (rc < 0)
1428 return rc;
1429 /*
1430 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1431 */
1432
1433 return iscsit_process_nop_out(conn, cmd, hdr);
1434 }
1435
1436 static int
1437 isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1438 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1439 struct iscsi_text *hdr)
1440 {
1441 struct iscsi_conn *conn = isert_conn->conn;
1442 u32 payload_length = ntoh24(hdr->dlength);
1443 int rc;
1444 unsigned char *text_in = NULL;
1445
1446 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1447 if (rc < 0)
1448 return rc;
1449
1450 if (payload_length) {
1451 text_in = kzalloc(payload_length, GFP_KERNEL);
1452 if (!text_in) {
1453 isert_err("Unable to allocate text_in of payload_length: %u\n",
1454 payload_length);
1455 return -ENOMEM;
1456 }
1457 }
1458 cmd->text_in_ptr = text_in;
1459
1460 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1461
1462 return iscsit_process_text_cmd(conn, cmd, hdr);
1463 }
1464
1465 static int
1466 isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1467 uint32_t read_stag, uint64_t read_va,
1468 uint32_t write_stag, uint64_t write_va)
1469 {
1470 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1471 struct iscsi_conn *conn = isert_conn->conn;
1472 struct iscsi_cmd *cmd;
1473 struct isert_cmd *isert_cmd;
1474 int ret = -EINVAL;
1475 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1476
1477 if (conn->sess->sess_ops->SessionType &&
1478 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1479 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1480 " ignoring\n", opcode);
1481 return 0;
1482 }
1483
1484 switch (opcode) {
1485 case ISCSI_OP_SCSI_CMD:
1486 cmd = isert_allocate_cmd(conn, rx_desc);
1487 if (!cmd)
1488 break;
1489
1490 isert_cmd = iscsit_priv_cmd(cmd);
1491 isert_cmd->read_stag = read_stag;
1492 isert_cmd->read_va = read_va;
1493 isert_cmd->write_stag = write_stag;
1494 isert_cmd->write_va = write_va;
1495 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1496
1497 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1498 rx_desc, (unsigned char *)hdr);
1499 break;
1500 case ISCSI_OP_NOOP_OUT:
1501 cmd = isert_allocate_cmd(conn, rx_desc);
1502 if (!cmd)
1503 break;
1504
1505 isert_cmd = iscsit_priv_cmd(cmd);
1506 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1507 rx_desc, (unsigned char *)hdr);
1508 break;
1509 case ISCSI_OP_SCSI_DATA_OUT:
1510 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1511 (unsigned char *)hdr);
1512 break;
1513 case ISCSI_OP_SCSI_TMFUNC:
1514 cmd = isert_allocate_cmd(conn, rx_desc);
1515 if (!cmd)
1516 break;
1517
1518 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1519 (unsigned char *)hdr);
1520 break;
1521 case ISCSI_OP_LOGOUT:
1522 cmd = isert_allocate_cmd(conn, rx_desc);
1523 if (!cmd)
1524 break;
1525
1526 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1527 break;
1528 case ISCSI_OP_TEXT:
1529 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1530 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1531 else
1532 cmd = isert_allocate_cmd(conn, rx_desc);
1533
1534 if (!cmd)
1535 break;
1536
1537 isert_cmd = iscsit_priv_cmd(cmd);
1538 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1539 rx_desc, (struct iscsi_text *)hdr);
1540 break;
1541 default:
1542 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1543 dump_stack();
1544 break;
1545 }
1546
1547 return ret;
1548 }
1549
1550 static void
1551 isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1552 {
1553 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1554 uint64_t read_va = 0, write_va = 0;
1555 uint32_t read_stag = 0, write_stag = 0;
1556
1557 switch (iser_ctrl->flags & 0xF0) {
1558 case ISCSI_CTRL:
1559 if (iser_ctrl->flags & ISER_RSV) {
1560 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1561 read_va = be64_to_cpu(iser_ctrl->read_va);
1562 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1563 read_stag, (unsigned long long)read_va);
1564 }
1565 if (iser_ctrl->flags & ISER_WSV) {
1566 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1567 write_va = be64_to_cpu(iser_ctrl->write_va);
1568 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1569 write_stag, (unsigned long long)write_va);
1570 }
1571
1572 isert_dbg("ISER ISCSI_CTRL PDU\n");
1573 break;
1574 case ISER_HELLO:
1575 isert_err("iSER Hello message\n");
1576 break;
1577 default:
1578 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1579 break;
1580 }
1581
1582 isert_rx_opcode(isert_conn, rx_desc,
1583 read_stag, read_va, write_stag, write_va);
1584 }
1585
1586 static void
1587 isert_rcv_completion(struct iser_rx_desc *desc,
1588 struct isert_conn *isert_conn,
1589 u32 xfer_len)
1590 {
1591 struct ib_device *ib_dev = isert_conn->cm_id->device;
1592 struct iscsi_hdr *hdr;
1593 u64 rx_dma;
1594 int rx_buflen;
1595
1596 if ((char *)desc == isert_conn->login_req_buf) {
1597 rx_dma = isert_conn->login_req_dma;
1598 rx_buflen = ISER_RX_LOGIN_SIZE;
1599 isert_dbg("login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1600 rx_dma, rx_buflen);
1601 } else {
1602 rx_dma = desc->dma_addr;
1603 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1604 isert_dbg("req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1605 rx_dma, rx_buflen);
1606 }
1607
1608 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1609
1610 hdr = &desc->iscsi_header;
1611 isert_dbg("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1612 hdr->opcode, hdr->itt, hdr->flags,
1613 (int)(xfer_len - ISER_HEADERS_LEN));
1614
1615 if ((char *)desc == isert_conn->login_req_buf) {
1616 isert_conn->login_req_len = xfer_len - ISER_HEADERS_LEN;
1617 if (isert_conn->conn) {
1618 struct iscsi_login *login = isert_conn->conn->conn_login;
1619
1620 if (login && !login->first_request)
1621 isert_rx_login_req(isert_conn);
1622 }
1623 mutex_lock(&isert_conn->mutex);
1624 complete(&isert_conn->login_req_comp);
1625 mutex_unlock(&isert_conn->mutex);
1626 } else {
1627 isert_rx_do_work(desc, isert_conn);
1628 }
1629
1630 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1631 DMA_FROM_DEVICE);
1632
1633 isert_conn->post_recv_buf_count--;
1634 }
1635
1636 static int
1637 isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1638 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1639 enum iser_ib_op_code op, struct isert_data_buf *data)
1640 {
1641 struct ib_device *ib_dev = isert_conn->cm_id->device;
1642
1643 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1644 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1645
1646 data->len = length - offset;
1647 data->offset = offset;
1648 data->sg_off = data->offset / PAGE_SIZE;
1649
1650 data->sg = &sg[data->sg_off];
1651 data->nents = min_t(unsigned int, nents - data->sg_off,
1652 ISCSI_ISER_SG_TABLESIZE);
1653 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1654 PAGE_SIZE);
1655
1656 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1657 data->dma_dir);
1658 if (unlikely(!data->dma_nents)) {
1659 isert_err("Cmd: unable to dma map SGs %p\n", sg);
1660 return -EINVAL;
1661 }
1662
1663 isert_dbg("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1664 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1665
1666 return 0;
1667 }
1668
1669 static void
1670 isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1671 {
1672 struct ib_device *ib_dev = isert_conn->cm_id->device;
1673
1674 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1675 memset(data, 0, sizeof(*data));
1676 }
1677
1678
1679
1680 static void
1681 isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1682 {
1683 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1684
1685 isert_dbg("Cmd %p\n", isert_cmd);
1686
1687 if (wr->data.sg) {
1688 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1689 isert_unmap_data_buf(isert_conn, &wr->data);
1690 }
1691
1692 if (wr->rdma_wr) {
1693 isert_dbg("Cmd %p free send_wr\n", isert_cmd);
1694 kfree(wr->rdma_wr);
1695 wr->rdma_wr = NULL;
1696 }
1697
1698 if (wr->ib_sge) {
1699 isert_dbg("Cmd %p free ib_sge\n", isert_cmd);
1700 kfree(wr->ib_sge);
1701 wr->ib_sge = NULL;
1702 }
1703 }
1704
1705 static void
1706 isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1707 {
1708 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1709
1710 isert_dbg("Cmd %p\n", isert_cmd);
1711
1712 if (wr->fr_desc) {
1713 isert_dbg("Cmd %p free fr_desc %p\n", isert_cmd, wr->fr_desc);
1714 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1715 isert_unmap_data_buf(isert_conn, &wr->prot);
1716 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1717 }
1718 spin_lock_bh(&isert_conn->pool_lock);
1719 list_add_tail(&wr->fr_desc->list, &isert_conn->fr_pool);
1720 spin_unlock_bh(&isert_conn->pool_lock);
1721 wr->fr_desc = NULL;
1722 }
1723
1724 if (wr->data.sg) {
1725 isert_dbg("Cmd %p unmap_sg op\n", isert_cmd);
1726 isert_unmap_data_buf(isert_conn, &wr->data);
1727 }
1728
1729 wr->ib_sge = NULL;
1730 wr->rdma_wr = NULL;
1731 }
1732
1733 static void
1734 isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1735 {
1736 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1737 struct isert_conn *isert_conn = isert_cmd->conn;
1738 struct iscsi_conn *conn = isert_conn->conn;
1739 struct isert_device *device = isert_conn->device;
1740 struct iscsi_text_rsp *hdr;
1741
1742 isert_dbg("Cmd %p\n", isert_cmd);
1743
1744 switch (cmd->iscsi_opcode) {
1745 case ISCSI_OP_SCSI_CMD:
1746 spin_lock_bh(&conn->cmd_lock);
1747 if (!list_empty(&cmd->i_conn_node))
1748 list_del_init(&cmd->i_conn_node);
1749 spin_unlock_bh(&conn->cmd_lock);
1750
1751 if (cmd->data_direction == DMA_TO_DEVICE) {
1752 iscsit_stop_dataout_timer(cmd);
1753 /*
1754 * Check for special case during comp_err where
1755 * WRITE_PENDING has been handed off from core,
1756 * but requires an extra target_put_sess_cmd()
1757 * before transport_generic_free_cmd() below.
1758 */
1759 if (comp_err &&
1760 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1761 struct se_cmd *se_cmd = &cmd->se_cmd;
1762
1763 target_put_sess_cmd(se_cmd);
1764 }
1765 }
1766
1767 device->unreg_rdma_mem(isert_cmd, isert_conn);
1768 transport_generic_free_cmd(&cmd->se_cmd, 0);
1769 break;
1770 case ISCSI_OP_SCSI_TMFUNC:
1771 spin_lock_bh(&conn->cmd_lock);
1772 if (!list_empty(&cmd->i_conn_node))
1773 list_del_init(&cmd->i_conn_node);
1774 spin_unlock_bh(&conn->cmd_lock);
1775
1776 transport_generic_free_cmd(&cmd->se_cmd, 0);
1777 break;
1778 case ISCSI_OP_REJECT:
1779 case ISCSI_OP_NOOP_OUT:
1780 case ISCSI_OP_TEXT:
1781 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1782 /* If the continue bit is on, keep the command alive */
1783 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1784 break;
1785
1786 spin_lock_bh(&conn->cmd_lock);
1787 if (!list_empty(&cmd->i_conn_node))
1788 list_del_init(&cmd->i_conn_node);
1789 spin_unlock_bh(&conn->cmd_lock);
1790
1791 /*
1792 * Handle special case for REJECT when iscsi_add_reject*() has
1793 * overwritten the original iscsi_opcode assignment, and the
1794 * associated cmd->se_cmd needs to be released.
1795 */
1796 if (cmd->se_cmd.se_tfo != NULL) {
1797 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1798 cmd->iscsi_opcode);
1799 transport_generic_free_cmd(&cmd->se_cmd, 0);
1800 break;
1801 }
1802 /*
1803 * Fall-through
1804 */
1805 default:
1806 iscsit_release_cmd(cmd);
1807 break;
1808 }
1809 }
1810
1811 static void
1812 isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1813 {
1814 if (tx_desc->dma_addr != 0) {
1815 isert_dbg("unmap single for tx_desc->dma_addr\n");
1816 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1817 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1818 tx_desc->dma_addr = 0;
1819 }
1820 }
1821
1822 static void
1823 isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1824 struct ib_device *ib_dev, bool comp_err)
1825 {
1826 if (isert_cmd->pdu_buf_dma != 0) {
1827 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1828 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1829 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1830 isert_cmd->pdu_buf_dma = 0;
1831 }
1832
1833 isert_unmap_tx_desc(tx_desc, ib_dev);
1834 isert_put_cmd(isert_cmd, comp_err);
1835 }
1836
1837 static int
1838 isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1839 {
1840 struct ib_mr_status mr_status;
1841 int ret;
1842
1843 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1844 if (ret) {
1845 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1846 goto fail_mr_status;
1847 }
1848
1849 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1850 u64 sec_offset_err;
1851 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1852
1853 switch (mr_status.sig_err.err_type) {
1854 case IB_SIG_BAD_GUARD:
1855 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1856 break;
1857 case IB_SIG_BAD_REFTAG:
1858 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1859 break;
1860 case IB_SIG_BAD_APPTAG:
1861 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1862 break;
1863 }
1864 sec_offset_err = mr_status.sig_err.sig_err_offset;
1865 do_div(sec_offset_err, block_size);
1866 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1867
1868 isert_err("PI error found type %d at sector 0x%llx "
1869 "expected 0x%x vs actual 0x%x\n",
1870 mr_status.sig_err.err_type,
1871 (unsigned long long)se_cmd->bad_sector,
1872 mr_status.sig_err.expected,
1873 mr_status.sig_err.actual);
1874 ret = 1;
1875 }
1876
1877 fail_mr_status:
1878 return ret;
1879 }
1880
1881 static void
1882 isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1883 struct isert_cmd *isert_cmd)
1884 {
1885 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1886 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1887 struct se_cmd *se_cmd = &cmd->se_cmd;
1888 struct isert_conn *isert_conn = isert_cmd->conn;
1889 struct isert_device *device = isert_conn->device;
1890 int ret = 0;
1891
1892 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1893 ret = isert_check_pi_status(se_cmd,
1894 wr->fr_desc->pi_ctx->sig_mr);
1895 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1896 }
1897
1898 device->unreg_rdma_mem(isert_cmd, isert_conn);
1899 wr->rdma_wr_num = 0;
1900 if (ret)
1901 transport_send_check_condition_and_sense(se_cmd,
1902 se_cmd->pi_err, 0);
1903 else
1904 isert_put_response(isert_conn->conn, cmd);
1905 }
1906
1907 static void
1908 isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1909 struct isert_cmd *isert_cmd)
1910 {
1911 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1912 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1913 struct se_cmd *se_cmd = &cmd->se_cmd;
1914 struct isert_conn *isert_conn = isert_cmd->conn;
1915 struct isert_device *device = isert_conn->device;
1916 int ret = 0;
1917
1918 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
1919 ret = isert_check_pi_status(se_cmd,
1920 wr->fr_desc->pi_ctx->sig_mr);
1921 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1922 }
1923
1924 iscsit_stop_dataout_timer(cmd);
1925 device->unreg_rdma_mem(isert_cmd, isert_conn);
1926 cmd->write_data_done = wr->data.len;
1927 wr->rdma_wr_num = 0;
1928
1929 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1930 spin_lock_bh(&cmd->istate_lock);
1931 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1932 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1933 spin_unlock_bh(&cmd->istate_lock);
1934
1935 if (ret) {
1936 target_put_sess_cmd(se_cmd);
1937 transport_send_check_condition_and_sense(se_cmd,
1938 se_cmd->pi_err, 0);
1939 } else {
1940 target_execute_cmd(se_cmd);
1941 }
1942 }
1943
1944 static void
1945 isert_do_control_comp(struct work_struct *work)
1946 {
1947 struct isert_cmd *isert_cmd = container_of(work,
1948 struct isert_cmd, comp_work);
1949 struct isert_conn *isert_conn = isert_cmd->conn;
1950 struct ib_device *ib_dev = isert_conn->cm_id->device;
1951 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1952
1953 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1954
1955 switch (cmd->i_state) {
1956 case ISTATE_SEND_TASKMGTRSP:
1957 iscsit_tmr_post_handler(cmd, cmd->conn);
1958 case ISTATE_SEND_REJECT: /* FALLTHRU */
1959 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1960 cmd->i_state = ISTATE_SENT_STATUS;
1961 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1962 ib_dev, false);
1963 break;
1964 case ISTATE_SEND_LOGOUTRSP:
1965 iscsit_logout_post_handler(cmd, cmd->conn);
1966 break;
1967 default:
1968 isert_err("Unknown i_state %d\n", cmd->i_state);
1969 dump_stack();
1970 break;
1971 }
1972 }
1973
1974 static void
1975 isert_response_completion(struct iser_tx_desc *tx_desc,
1976 struct isert_cmd *isert_cmd,
1977 struct isert_conn *isert_conn,
1978 struct ib_device *ib_dev)
1979 {
1980 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1981
1982 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
1983 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
1984 cmd->i_state == ISTATE_SEND_REJECT ||
1985 cmd->i_state == ISTATE_SEND_TEXTRSP) {
1986 isert_unmap_tx_desc(tx_desc, ib_dev);
1987
1988 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1989 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1990 return;
1991 }
1992
1993 cmd->i_state = ISTATE_SENT_STATUS;
1994 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1995 }
1996
1997 static void
1998 isert_snd_completion(struct iser_tx_desc *tx_desc,
1999 struct isert_conn *isert_conn)
2000 {
2001 struct ib_device *ib_dev = isert_conn->cm_id->device;
2002 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
2003 struct isert_rdma_wr *wr;
2004
2005 if (!isert_cmd) {
2006 isert_unmap_tx_desc(tx_desc, ib_dev);
2007 return;
2008 }
2009 wr = &isert_cmd->rdma_wr;
2010
2011 isert_dbg("Cmd %p iser_ib_op %d\n", isert_cmd, wr->iser_ib_op);
2012
2013 switch (wr->iser_ib_op) {
2014 case ISER_IB_SEND:
2015 isert_response_completion(tx_desc, isert_cmd,
2016 isert_conn, ib_dev);
2017 break;
2018 case ISER_IB_RDMA_WRITE:
2019 isert_completion_rdma_write(tx_desc, isert_cmd);
2020 break;
2021 case ISER_IB_RDMA_READ:
2022 isert_completion_rdma_read(tx_desc, isert_cmd);
2023 break;
2024 default:
2025 isert_err("Unknown wr->iser_ib_op: 0x%x\n", wr->iser_ib_op);
2026 dump_stack();
2027 break;
2028 }
2029 }
2030
2031 /**
2032 * is_isert_tx_desc() - Indicate if the completion wr_id
2033 * is a TX descriptor or not.
2034 * @isert_conn: iser connection
2035 * @wr_id: completion WR identifier
2036 *
2037 * Since we cannot rely on wc opcode in FLUSH errors
2038 * we must work around it by checking if the wr_id address
2039 * falls in the iser connection rx_descs buffer. If so
2040 * it is an RX descriptor, otherwize it is a TX.
2041 */
2042 static inline bool
2043 is_isert_tx_desc(struct isert_conn *isert_conn, void *wr_id)
2044 {
2045 void *start = isert_conn->rx_descs;
2046 int len = ISERT_QP_MAX_RECV_DTOS * sizeof(*isert_conn->rx_descs);
2047
2048 if (wr_id >= start && wr_id < start + len)
2049 return false;
2050
2051 return true;
2052 }
2053
2054 static void
2055 isert_cq_comp_err(struct isert_conn *isert_conn, struct ib_wc *wc)
2056 {
2057 if (wc->wr_id == ISER_BEACON_WRID) {
2058 isert_info("conn %p completing wait_comp_err\n",
2059 isert_conn);
2060 complete(&isert_conn->wait_comp_err);
2061 } else if (is_isert_tx_desc(isert_conn, (void *)(uintptr_t)wc->wr_id)) {
2062 struct ib_device *ib_dev = isert_conn->cm_id->device;
2063 struct isert_cmd *isert_cmd;
2064 struct iser_tx_desc *desc;
2065
2066 desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2067 isert_cmd = desc->isert_cmd;
2068 if (!isert_cmd)
2069 isert_unmap_tx_desc(desc, ib_dev);
2070 else
2071 isert_completion_put(desc, isert_cmd, ib_dev, true);
2072 } else {
2073 isert_conn->post_recv_buf_count--;
2074 if (!isert_conn->post_recv_buf_count)
2075 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2076 }
2077 }
2078
2079 static void
2080 isert_handle_wc(struct ib_wc *wc)
2081 {
2082 struct isert_conn *isert_conn;
2083 struct iser_tx_desc *tx_desc;
2084 struct iser_rx_desc *rx_desc;
2085
2086 isert_conn = wc->qp->qp_context;
2087 if (likely(wc->status == IB_WC_SUCCESS)) {
2088 if (wc->opcode == IB_WC_RECV) {
2089 rx_desc = (struct iser_rx_desc *)(uintptr_t)wc->wr_id;
2090 isert_rcv_completion(rx_desc, isert_conn, wc->byte_len);
2091 } else {
2092 tx_desc = (struct iser_tx_desc *)(uintptr_t)wc->wr_id;
2093 isert_snd_completion(tx_desc, isert_conn);
2094 }
2095 } else {
2096 if (wc->status != IB_WC_WR_FLUSH_ERR)
2097 isert_err("%s (%d): wr id %llx vend_err %x\n",
2098 ib_wc_status_msg(wc->status), wc->status,
2099 wc->wr_id, wc->vendor_err);
2100 else
2101 isert_dbg("%s (%d): wr id %llx\n",
2102 ib_wc_status_msg(wc->status), wc->status,
2103 wc->wr_id);
2104
2105 if (wc->wr_id != ISER_FASTREG_LI_WRID)
2106 isert_cq_comp_err(isert_conn, wc);
2107 }
2108 }
2109
2110 static void
2111 isert_cq_work(struct work_struct *work)
2112 {
2113 enum { isert_poll_budget = 65536 };
2114 struct isert_comp *comp = container_of(work, struct isert_comp,
2115 work);
2116 struct ib_wc *const wcs = comp->wcs;
2117 int i, n, completed = 0;
2118
2119 while ((n = ib_poll_cq(comp->cq, ARRAY_SIZE(comp->wcs), wcs)) > 0) {
2120 for (i = 0; i < n; i++)
2121 isert_handle_wc(&wcs[i]);
2122
2123 completed += n;
2124 if (completed >= isert_poll_budget)
2125 break;
2126 }
2127
2128 ib_req_notify_cq(comp->cq, IB_CQ_NEXT_COMP);
2129 }
2130
2131 static void
2132 isert_cq_callback(struct ib_cq *cq, void *context)
2133 {
2134 struct isert_comp *comp = context;
2135
2136 queue_work(isert_comp_wq, &comp->work);
2137 }
2138
2139 static int
2140 isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2141 {
2142 struct ib_send_wr *wr_failed;
2143 int ret;
2144
2145 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2146 if (ret) {
2147 isert_err("ib_post_recv failed with %d\n", ret);
2148 return ret;
2149 }
2150
2151 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
2152 &wr_failed);
2153 if (ret) {
2154 isert_err("ib_post_send failed with %d\n", ret);
2155 return ret;
2156 }
2157 return ret;
2158 }
2159
2160 static int
2161 isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2162 {
2163 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2164 struct isert_conn *isert_conn = conn->context;
2165 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2166 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2167 &isert_cmd->tx_desc.iscsi_header;
2168
2169 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2170 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2171 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2172 /*
2173 * Attach SENSE DATA payload to iSCSI Response PDU
2174 */
2175 if (cmd->se_cmd.sense_buffer &&
2176 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2177 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2178 struct isert_device *device = isert_conn->device;
2179 struct ib_device *ib_dev = device->ib_device;
2180 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2181 u32 padding, pdu_len;
2182
2183 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2184 cmd->sense_buffer);
2185 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2186
2187 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2188 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
2189 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
2190
2191 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2192 (void *)cmd->sense_buffer, pdu_len,
2193 DMA_TO_DEVICE);
2194
2195 isert_cmd->pdu_buf_len = pdu_len;
2196 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2197 tx_dsg->length = pdu_len;
2198 tx_dsg->lkey = device->pd->local_dma_lkey;
2199 isert_cmd->tx_desc.num_sge = 2;
2200 }
2201
2202 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2203
2204 isert_dbg("Posting SCSI Response\n");
2205
2206 return isert_post_response(isert_conn, isert_cmd);
2207 }
2208
2209 static void
2210 isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2211 {
2212 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2213 struct isert_conn *isert_conn = conn->context;
2214 struct isert_device *device = isert_conn->device;
2215
2216 spin_lock_bh(&conn->cmd_lock);
2217 if (!list_empty(&cmd->i_conn_node))
2218 list_del_init(&cmd->i_conn_node);
2219 spin_unlock_bh(&conn->cmd_lock);
2220
2221 if (cmd->data_direction == DMA_TO_DEVICE)
2222 iscsit_stop_dataout_timer(cmd);
2223
2224 device->unreg_rdma_mem(isert_cmd, isert_conn);
2225 }
2226
2227 static enum target_prot_op
2228 isert_get_sup_prot_ops(struct iscsi_conn *conn)
2229 {
2230 struct isert_conn *isert_conn = conn->context;
2231 struct isert_device *device = isert_conn->device;
2232
2233 if (conn->tpg->tpg_attrib.t10_pi) {
2234 if (device->pi_capable) {
2235 isert_info("conn %p PI offload enabled\n", isert_conn);
2236 isert_conn->pi_support = true;
2237 return TARGET_PROT_ALL;
2238 }
2239 }
2240
2241 isert_info("conn %p PI offload disabled\n", isert_conn);
2242 isert_conn->pi_support = false;
2243
2244 return TARGET_PROT_NORMAL;
2245 }
2246
2247 static int
2248 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2249 bool nopout_response)
2250 {
2251 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2252 struct isert_conn *isert_conn = conn->context;
2253 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2254
2255 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2256 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2257 &isert_cmd->tx_desc.iscsi_header,
2258 nopout_response);
2259 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2260 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2261
2262 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
2263
2264 return isert_post_response(isert_conn, isert_cmd);
2265 }
2266
2267 static int
2268 isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2269 {
2270 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2271 struct isert_conn *isert_conn = conn->context;
2272 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2273
2274 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2275 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2276 &isert_cmd->tx_desc.iscsi_header);
2277 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2278 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2279
2280 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
2281
2282 return isert_post_response(isert_conn, isert_cmd);
2283 }
2284
2285 static int
2286 isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2287 {
2288 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2289 struct isert_conn *isert_conn = conn->context;
2290 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2291
2292 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2293 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2294 &isert_cmd->tx_desc.iscsi_header);
2295 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2296 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2297
2298 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
2299
2300 return isert_post_response(isert_conn, isert_cmd);
2301 }
2302
2303 static int
2304 isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2305 {
2306 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2307 struct isert_conn *isert_conn = conn->context;
2308 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2309 struct isert_device *device = isert_conn->device;
2310 struct ib_device *ib_dev = device->ib_device;
2311 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2312 struct iscsi_reject *hdr =
2313 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
2314
2315 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2316 iscsit_build_reject(cmd, conn, hdr);
2317 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2318
2319 hton24(hdr->dlength, ISCSI_HDR_LEN);
2320 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2321 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2322 DMA_TO_DEVICE);
2323 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2324 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2325 tx_dsg->length = ISCSI_HDR_LEN;
2326 tx_dsg->lkey = device->pd->local_dma_lkey;
2327 isert_cmd->tx_desc.num_sge = 2;
2328
2329 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2330
2331 isert_dbg("conn %p Posting Reject\n", isert_conn);
2332
2333 return isert_post_response(isert_conn, isert_cmd);
2334 }
2335
2336 static int
2337 isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2338 {
2339 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2340 struct isert_conn *isert_conn = conn->context;
2341 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2342 struct iscsi_text_rsp *hdr =
2343 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2344 u32 txt_rsp_len;
2345 int rc;
2346
2347 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2348 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2349 if (rc < 0)
2350 return rc;
2351
2352 txt_rsp_len = rc;
2353 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2354
2355 if (txt_rsp_len) {
2356 struct isert_device *device = isert_conn->device;
2357 struct ib_device *ib_dev = device->ib_device;
2358 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2359 void *txt_rsp_buf = cmd->buf_ptr;
2360
2361 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2362 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2363
2364 isert_cmd->pdu_buf_len = txt_rsp_len;
2365 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2366 tx_dsg->length = txt_rsp_len;
2367 tx_dsg->lkey = device->pd->local_dma_lkey;
2368 isert_cmd->tx_desc.num_sge = 2;
2369 }
2370 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2371
2372 isert_dbg("conn %p Text Response\n", isert_conn);
2373
2374 return isert_post_response(isert_conn, isert_cmd);
2375 }
2376
2377 static int
2378 isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2379 struct ib_sge *ib_sge, struct ib_rdma_wr *rdma_wr,
2380 u32 data_left, u32 offset)
2381 {
2382 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
2383 struct scatterlist *sg_start, *tmp_sg;
2384 struct isert_device *device = isert_conn->device;
2385 struct ib_device *ib_dev = device->ib_device;
2386 u32 sg_off, page_off;
2387 int i = 0, sg_nents;
2388
2389 sg_off = offset / PAGE_SIZE;
2390 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2391 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2392 page_off = offset % PAGE_SIZE;
2393
2394 rdma_wr->wr.sg_list = ib_sge;
2395 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2396 /*
2397 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2398 */
2399 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2400 isert_dbg("RDMA from SGL dma_addr: 0x%llx dma_len: %u, "
2401 "page_off: %u\n",
2402 (unsigned long long)tmp_sg->dma_address,
2403 tmp_sg->length, page_off);
2404
2405 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2406 ib_sge->length = min_t(u32, data_left,
2407 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2408 ib_sge->lkey = device->pd->local_dma_lkey;
2409
2410 isert_dbg("RDMA ib_sge: addr: 0x%llx length: %u lkey: %x\n",
2411 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2412 page_off = 0;
2413 data_left -= ib_sge->length;
2414 if (!data_left)
2415 break;
2416 ib_sge++;
2417 isert_dbg("Incrementing ib_sge pointer to %p\n", ib_sge);
2418 }
2419
2420 rdma_wr->wr.num_sge = ++i;
2421 isert_dbg("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2422 rdma_wr->wr.sg_list, rdma_wr->wr.num_sge);
2423
2424 return rdma_wr->wr.num_sge;
2425 }
2426
2427 static int
2428 isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2429 struct isert_rdma_wr *wr)
2430 {
2431 struct se_cmd *se_cmd = &cmd->se_cmd;
2432 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2433 struct isert_conn *isert_conn = conn->context;
2434 struct isert_data_buf *data = &wr->data;
2435 struct ib_rdma_wr *rdma_wr;
2436 struct ib_sge *ib_sge;
2437 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2438 int ret = 0, i, ib_sge_cnt;
2439
2440 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2441
2442 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2443 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2444 se_cmd->t_data_nents, se_cmd->data_length,
2445 offset, wr->iser_ib_op, &wr->data);
2446 if (ret)
2447 return ret;
2448
2449 data_left = data->len;
2450 offset = data->offset;
2451
2452 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
2453 if (!ib_sge) {
2454 isert_warn("Unable to allocate ib_sge\n");
2455 ret = -ENOMEM;
2456 goto unmap_cmd;
2457 }
2458 wr->ib_sge = ib_sge;
2459
2460 wr->rdma_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
2461 wr->rdma_wr = kzalloc(sizeof(struct ib_rdma_wr) * wr->rdma_wr_num,
2462 GFP_KERNEL);
2463 if (!wr->rdma_wr) {
2464 isert_dbg("Unable to allocate wr->rdma_wr\n");
2465 ret = -ENOMEM;
2466 goto unmap_cmd;
2467 }
2468
2469 wr->isert_cmd = isert_cmd;
2470 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
2471
2472 for (i = 0; i < wr->rdma_wr_num; i++) {
2473 rdma_wr = &isert_cmd->rdma_wr.rdma_wr[i];
2474 data_len = min(data_left, rdma_write_max);
2475
2476 rdma_wr->wr.send_flags = 0;
2477 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2478 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2479 rdma_wr->remote_addr = isert_cmd->read_va + offset;
2480 rdma_wr->rkey = isert_cmd->read_stag;
2481 if (i + 1 == wr->rdma_wr_num)
2482 rdma_wr->wr.next = &isert_cmd->tx_desc.send_wr;
2483 else
2484 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2485 } else {
2486 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2487 rdma_wr->remote_addr = isert_cmd->write_va + va_offset;
2488 rdma_wr->rkey = isert_cmd->write_stag;
2489 if (i + 1 == wr->rdma_wr_num)
2490 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2491 else
2492 rdma_wr->wr.next = &wr->rdma_wr[i + 1].wr;
2493 }
2494
2495 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2496 rdma_wr, data_len, offset);
2497 ib_sge += ib_sge_cnt;
2498
2499 offset += data_len;
2500 va_offset += data_len;
2501 data_left -= data_len;
2502 }
2503
2504 return 0;
2505 unmap_cmd:
2506 isert_unmap_data_buf(isert_conn, data);
2507
2508 return ret;
2509 }
2510
2511 static inline void
2512 isert_inv_rkey(struct ib_send_wr *inv_wr, struct ib_mr *mr)
2513 {
2514 u32 rkey;
2515
2516 memset(inv_wr, 0, sizeof(*inv_wr));
2517 inv_wr->wr_id = ISER_FASTREG_LI_WRID;
2518 inv_wr->opcode = IB_WR_LOCAL_INV;
2519 inv_wr->ex.invalidate_rkey = mr->rkey;
2520
2521 /* Bump the key */
2522 rkey = ib_inc_rkey(mr->rkey);
2523 ib_update_fast_reg_key(mr, rkey);
2524 }
2525
2526 static int
2527 isert_fast_reg_mr(struct isert_conn *isert_conn,
2528 struct fast_reg_descriptor *fr_desc,
2529 struct isert_data_buf *mem,
2530 enum isert_indicator ind,
2531 struct ib_sge *sge)
2532 {
2533 struct isert_device *device = isert_conn->device;
2534 struct ib_device *ib_dev = device->ib_device;
2535 struct ib_mr *mr;
2536 struct ib_reg_wr reg_wr;
2537 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2538 int ret, n;
2539
2540 if (mem->dma_nents == 1) {
2541 sge->lkey = device->pd->local_dma_lkey;
2542 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2543 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
2544 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2545 sge->addr, sge->length, sge->lkey);
2546 return 0;
2547 }
2548
2549 if (ind == ISERT_DATA_KEY_VALID)
2550 /* Registering data buffer */
2551 mr = fr_desc->data_mr;
2552 else
2553 /* Registering protection buffer */
2554 mr = fr_desc->pi_ctx->prot_mr;
2555
2556 if (!(fr_desc->ind & ind)) {
2557 isert_inv_rkey(&inv_wr, mr);
2558 wr = &inv_wr;
2559 }
2560
2561 n = ib_map_mr_sg(mr, mem->sg, mem->nents, PAGE_SIZE);
2562 if (unlikely(n != mem->nents)) {
2563 isert_err("failed to map mr sg (%d/%d)\n",
2564 n, mem->nents);
2565 return n < 0 ? n : -EINVAL;
2566 }
2567
2568 isert_dbg("Use fr_desc %p sg_nents %d offset %u\n",
2569 fr_desc, mem->nents, mem->offset);
2570
2571 reg_wr.wr.next = NULL;
2572 reg_wr.wr.opcode = IB_WR_REG_MR;
2573 reg_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2574 reg_wr.wr.send_flags = 0;
2575 reg_wr.wr.num_sge = 0;
2576 reg_wr.mr = mr;
2577 reg_wr.key = mr->lkey;
2578 reg_wr.access = IB_ACCESS_LOCAL_WRITE;
2579
2580 if (!wr)
2581 wr = &reg_wr.wr;
2582 else
2583 wr->next = &reg_wr.wr;
2584
2585 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2586 if (ret) {
2587 isert_err("fast registration failed, ret:%d\n", ret);
2588 return ret;
2589 }
2590 fr_desc->ind &= ~ind;
2591
2592 sge->lkey = mr->lkey;
2593 sge->addr = mr->iova;
2594 sge->length = mr->length;
2595
2596 isert_dbg("sge: addr: 0x%llx length: %u lkey: %x\n",
2597 sge->addr, sge->length, sge->lkey);
2598
2599 return ret;
2600 }
2601
2602 static inline void
2603 isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2604 struct ib_sig_domain *domain)
2605 {
2606 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2607 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2608 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2609 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2610 /*
2611 * At the moment we hard code those, but if in the future
2612 * the target core would like to use it, we will take it
2613 * from se_cmd.
2614 */
2615 domain->sig.dif.apptag_check_mask = 0xffff;
2616 domain->sig.dif.app_escape = true;
2617 domain->sig.dif.ref_escape = true;
2618 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2619 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2620 domain->sig.dif.ref_remap = true;
2621 };
2622
2623 static int
2624 isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2625 {
2626 switch (se_cmd->prot_op) {
2627 case TARGET_PROT_DIN_INSERT:
2628 case TARGET_PROT_DOUT_STRIP:
2629 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2630 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2631 break;
2632 case TARGET_PROT_DOUT_INSERT:
2633 case TARGET_PROT_DIN_STRIP:
2634 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2635 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2636 break;
2637 case TARGET_PROT_DIN_PASS:
2638 case TARGET_PROT_DOUT_PASS:
2639 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2640 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2641 break;
2642 default:
2643 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2644 return -EINVAL;
2645 }
2646
2647 return 0;
2648 }
2649
2650 static inline u8
2651 isert_set_prot_checks(u8 prot_checks)
2652 {
2653 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2654 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2655 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2656 }
2657
2658 static int
2659 isert_reg_sig_mr(struct isert_conn *isert_conn,
2660 struct se_cmd *se_cmd,
2661 struct isert_rdma_wr *rdma_wr,
2662 struct fast_reg_descriptor *fr_desc)
2663 {
2664 struct ib_sig_handover_wr sig_wr;
2665 struct ib_send_wr inv_wr, *bad_wr, *wr = NULL;
2666 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2667 struct ib_sig_attrs sig_attrs;
2668 int ret;
2669
2670 memset(&sig_attrs, 0, sizeof(sig_attrs));
2671 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2672 if (ret)
2673 goto err;
2674
2675 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2676
2677 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2678 isert_inv_rkey(&inv_wr, pi_ctx->sig_mr);
2679 wr = &inv_wr;
2680 }
2681
2682 memset(&sig_wr, 0, sizeof(sig_wr));
2683 sig_wr.wr.opcode = IB_WR_REG_SIG_MR;
2684 sig_wr.wr.wr_id = ISER_FASTREG_LI_WRID;
2685 sig_wr.wr.sg_list = &rdma_wr->ib_sg[DATA];
2686 sig_wr.wr.num_sge = 1;
2687 sig_wr.access_flags = IB_ACCESS_LOCAL_WRITE;
2688 sig_wr.sig_attrs = &sig_attrs;
2689 sig_wr.sig_mr = pi_ctx->sig_mr;
2690 if (se_cmd->t_prot_sg)
2691 sig_wr.prot = &rdma_wr->ib_sg[PROT];
2692
2693 if (!wr)
2694 wr = &sig_wr.wr;
2695 else
2696 wr->next = &sig_wr.wr;
2697
2698 ret = ib_post_send(isert_conn->qp, wr, &bad_wr);
2699 if (ret) {
2700 isert_err("fast registration failed, ret:%d\n", ret);
2701 goto err;
2702 }
2703 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2704
2705 rdma_wr->ib_sg[SIG].lkey = pi_ctx->sig_mr->lkey;
2706 rdma_wr->ib_sg[SIG].addr = 0;
2707 rdma_wr->ib_sg[SIG].length = se_cmd->data_length;
2708 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2709 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2710 /*
2711 * We have protection guards on the wire
2712 * so we need to set a larget transfer
2713 */
2714 rdma_wr->ib_sg[SIG].length += se_cmd->prot_length;
2715
2716 isert_dbg("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2717 rdma_wr->ib_sg[SIG].addr, rdma_wr->ib_sg[SIG].length,
2718 rdma_wr->ib_sg[SIG].lkey);
2719 err:
2720 return ret;
2721 }
2722
2723 static int
2724 isert_handle_prot_cmd(struct isert_conn *isert_conn,
2725 struct isert_cmd *isert_cmd,
2726 struct isert_rdma_wr *wr)
2727 {
2728 struct isert_device *device = isert_conn->device;
2729 struct se_cmd *se_cmd = &isert_cmd->iscsi_cmd->se_cmd;
2730 int ret;
2731
2732 if (!wr->fr_desc->pi_ctx) {
2733 ret = isert_create_pi_ctx(wr->fr_desc,
2734 device->ib_device,
2735 device->pd);
2736 if (ret) {
2737 isert_err("conn %p failed to allocate pi_ctx\n",
2738 isert_conn);
2739 return ret;
2740 }
2741 }
2742
2743 if (se_cmd->t_prot_sg) {
2744 ret = isert_map_data_buf(isert_conn, isert_cmd,
2745 se_cmd->t_prot_sg,
2746 se_cmd->t_prot_nents,
2747 se_cmd->prot_length,
2748 0, wr->iser_ib_op, &wr->prot);
2749 if (ret) {
2750 isert_err("conn %p failed to map protection buffer\n",
2751 isert_conn);
2752 return ret;
2753 }
2754
2755 memset(&wr->ib_sg[PROT], 0, sizeof(wr->ib_sg[PROT]));
2756 ret = isert_fast_reg_mr(isert_conn, wr->fr_desc, &wr->prot,
2757 ISERT_PROT_KEY_VALID, &wr->ib_sg[PROT]);
2758 if (ret) {
2759 isert_err("conn %p failed to fast reg mr\n",
2760 isert_conn);
2761 goto unmap_prot_cmd;
2762 }
2763 }
2764
2765 ret = isert_reg_sig_mr(isert_conn, se_cmd, wr, wr->fr_desc);
2766 if (ret) {
2767 isert_err("conn %p failed to fast reg mr\n",
2768 isert_conn);
2769 goto unmap_prot_cmd;
2770 }
2771 wr->fr_desc->ind |= ISERT_PROTECTED;
2772
2773 return 0;
2774
2775 unmap_prot_cmd:
2776 if (se_cmd->t_prot_sg)
2777 isert_unmap_data_buf(isert_conn, &wr->prot);
2778
2779 return ret;
2780 }
2781
2782 static int
2783 isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2784 struct isert_rdma_wr *wr)
2785 {
2786 struct se_cmd *se_cmd = &cmd->se_cmd;
2787 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2788 struct isert_conn *isert_conn = conn->context;
2789 struct fast_reg_descriptor *fr_desc = NULL;
2790 struct ib_rdma_wr *rdma_wr;
2791 struct ib_sge *ib_sg;
2792 u32 offset;
2793 int ret = 0;
2794 unsigned long flags;
2795
2796 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2797
2798 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2799 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2800 se_cmd->t_data_nents, se_cmd->data_length,
2801 offset, wr->iser_ib_op, &wr->data);
2802 if (ret)
2803 return ret;
2804
2805 if (wr->data.dma_nents != 1 || isert_prot_cmd(isert_conn, se_cmd)) {
2806 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2807 fr_desc = list_first_entry(&isert_conn->fr_pool,
2808 struct fast_reg_descriptor, list);
2809 list_del(&fr_desc->list);
2810 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2811 wr->fr_desc = fr_desc;
2812 }
2813
2814 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2815 ISERT_DATA_KEY_VALID, &wr->ib_sg[DATA]);
2816 if (ret)
2817 goto unmap_cmd;
2818
2819 if (isert_prot_cmd(isert_conn, se_cmd)) {
2820 ret = isert_handle_prot_cmd(isert_conn, isert_cmd, wr);
2821 if (ret)
2822 goto unmap_cmd;
2823
2824 ib_sg = &wr->ib_sg[SIG];
2825 } else {
2826 ib_sg = &wr->ib_sg[DATA];
2827 }
2828
2829 memcpy(&wr->s_ib_sge, ib_sg, sizeof(*ib_sg));
2830 wr->ib_sge = &wr->s_ib_sge;
2831 wr->rdma_wr_num = 1;
2832 memset(&wr->s_rdma_wr, 0, sizeof(wr->s_rdma_wr));
2833 wr->rdma_wr = &wr->s_rdma_wr;
2834 wr->isert_cmd = isert_cmd;
2835
2836 rdma_wr = &isert_cmd->rdma_wr.s_rdma_wr;
2837 rdma_wr->wr.sg_list = &wr->s_ib_sge;
2838 rdma_wr->wr.num_sge = 1;
2839 rdma_wr->wr.wr_id = (uintptr_t)&isert_cmd->tx_desc;
2840 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2841 rdma_wr->wr.opcode = IB_WR_RDMA_WRITE;
2842 rdma_wr->remote_addr = isert_cmd->read_va;
2843 rdma_wr->rkey = isert_cmd->read_stag;
2844 rdma_wr->wr.send_flags = !isert_prot_cmd(isert_conn, se_cmd) ?
2845 0 : IB_SEND_SIGNALED;
2846 } else {
2847 rdma_wr->wr.opcode = IB_WR_RDMA_READ;
2848 rdma_wr->remote_addr = isert_cmd->write_va;
2849 rdma_wr->rkey = isert_cmd->write_stag;
2850 rdma_wr->wr.send_flags = IB_SEND_SIGNALED;
2851 }
2852
2853 return 0;
2854
2855 unmap_cmd:
2856 if (fr_desc) {
2857 spin_lock_irqsave(&isert_conn->pool_lock, flags);
2858 list_add_tail(&fr_desc->list, &isert_conn->fr_pool);
2859 spin_unlock_irqrestore(&isert_conn->pool_lock, flags);
2860 }
2861 isert_unmap_data_buf(isert_conn, &wr->data);
2862
2863 return ret;
2864 }
2865
2866 static int
2867 isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2868 {
2869 struct se_cmd *se_cmd = &cmd->se_cmd;
2870 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2871 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2872 struct isert_conn *isert_conn = conn->context;
2873 struct isert_device *device = isert_conn->device;
2874 struct ib_send_wr *wr_failed;
2875 int rc;
2876
2877 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2878 isert_cmd, se_cmd->data_length);
2879
2880 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
2881 rc = device->reg_rdma_mem(conn, cmd, wr);
2882 if (rc) {
2883 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2884 return rc;
2885 }
2886
2887 if (!isert_prot_cmd(isert_conn, se_cmd)) {
2888 /*
2889 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2890 */
2891 isert_create_send_desc(isert_conn, isert_cmd,
2892 &isert_cmd->tx_desc);
2893 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2894 &isert_cmd->tx_desc.iscsi_header);
2895 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2896 isert_init_send_wr(isert_conn, isert_cmd,
2897 &isert_cmd->tx_desc.send_wr);
2898 isert_cmd->rdma_wr.s_rdma_wr.wr.next = &isert_cmd->tx_desc.send_wr;
2899 wr->rdma_wr_num += 1;
2900
2901 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2902 if (rc) {
2903 isert_err("ib_post_recv failed with %d\n", rc);
2904 return rc;
2905 }
2906 }
2907
2908 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2909 if (rc)
2910 isert_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
2911
2912 if (!isert_prot_cmd(isert_conn, se_cmd))
2913 isert_dbg("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2914 "READ\n", isert_cmd);
2915 else
2916 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2917 isert_cmd);
2918
2919 return 1;
2920 }
2921
2922 static int
2923 isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2924 {
2925 struct se_cmd *se_cmd = &cmd->se_cmd;
2926 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2927 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2928 struct isert_conn *isert_conn = conn->context;
2929 struct isert_device *device = isert_conn->device;
2930 struct ib_send_wr *wr_failed;
2931 int rc;
2932
2933 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2934 isert_cmd, se_cmd->data_length, cmd->write_data_done);
2935 wr->iser_ib_op = ISER_IB_RDMA_READ;
2936 rc = device->reg_rdma_mem(conn, cmd, wr);
2937 if (rc) {
2938 isert_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2939 return rc;
2940 }
2941
2942 rc = ib_post_send(isert_conn->qp, &wr->rdma_wr->wr, &wr_failed);
2943 if (rc)
2944 isert_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
2945
2946 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2947 isert_cmd);
2948
2949 return 0;
2950 }
2951
2952 static int
2953 isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2954 {
2955 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2956 int ret = 0;
2957
2958 switch (state) {
2959 case ISTATE_REMOVE:
2960 spin_lock_bh(&conn->cmd_lock);
2961 list_del_init(&cmd->i_conn_node);
2962 spin_unlock_bh(&conn->cmd_lock);
2963 isert_put_cmd(isert_cmd, true);
2964 break;
2965 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2966 ret = isert_put_nopin(cmd, conn, false);
2967 break;
2968 default:
2969 isert_err("Unknown immediate state: 0x%02x\n", state);
2970 ret = -EINVAL;
2971 break;
2972 }
2973
2974 return ret;
2975 }
2976
2977 static int
2978 isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2979 {
2980 struct isert_conn *isert_conn = conn->context;
2981 int ret;
2982
2983 switch (state) {
2984 case ISTATE_SEND_LOGOUTRSP:
2985 ret = isert_put_logout_rsp(cmd, conn);
2986 if (!ret)
2987 isert_conn->logout_posted = true;
2988 break;
2989 case ISTATE_SEND_NOPIN:
2990 ret = isert_put_nopin(cmd, conn, true);
2991 break;
2992 case ISTATE_SEND_TASKMGTRSP:
2993 ret = isert_put_tm_rsp(cmd, conn);
2994 break;
2995 case ISTATE_SEND_REJECT:
2996 ret = isert_put_reject(cmd, conn);
2997 break;
2998 case ISTATE_SEND_TEXTRSP:
2999 ret = isert_put_text_rsp(cmd, conn);
3000 break;
3001 case ISTATE_SEND_STATUS:
3002 /*
3003 * Special case for sending non GOOD SCSI status from TX thread
3004 * context during pre se_cmd excecution failure.
3005 */
3006 ret = isert_put_response(conn, cmd);
3007 break;
3008 default:
3009 isert_err("Unknown response state: 0x%02x\n", state);
3010 ret = -EINVAL;
3011 break;
3012 }
3013
3014 return ret;
3015 }
3016
3017 struct rdma_cm_id *
3018 isert_setup_id(struct isert_np *isert_np)
3019 {
3020 struct iscsi_np *np = isert_np->np;
3021 struct rdma_cm_id *id;
3022 struct sockaddr *sa;
3023 int ret;
3024
3025 sa = (struct sockaddr *)&np->np_sockaddr;
3026 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
3027
3028 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
3029 RDMA_PS_TCP, IB_QPT_RC);
3030 if (IS_ERR(id)) {
3031 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
3032 ret = PTR_ERR(id);
3033 goto out;
3034 }
3035 isert_dbg("id %p context %p\n", id, id->context);
3036
3037 ret = rdma_bind_addr(id, sa);
3038 if (ret) {
3039 isert_err("rdma_bind_addr() failed: %d\n", ret);
3040 goto out_id;
3041 }
3042
3043 ret = rdma_listen(id, 0);
3044 if (ret) {
3045 isert_err("rdma_listen() failed: %d\n", ret);
3046 goto out_id;
3047 }
3048
3049 return id;
3050 out_id:
3051 rdma_destroy_id(id);
3052 out:
3053 return ERR_PTR(ret);
3054 }
3055
3056 static int
3057 isert_setup_np(struct iscsi_np *np,
3058 struct sockaddr_storage *ksockaddr)
3059 {
3060 struct isert_np *isert_np;
3061 struct rdma_cm_id *isert_lid;
3062 int ret;
3063
3064 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
3065 if (!isert_np) {
3066 isert_err("Unable to allocate struct isert_np\n");
3067 return -ENOMEM;
3068 }
3069 sema_init(&isert_np->sem, 0);
3070 mutex_init(&isert_np->mutex);
3071 INIT_LIST_HEAD(&isert_np->accepted);
3072 INIT_LIST_HEAD(&isert_np->pending);
3073 isert_np->np = np;
3074
3075 /*
3076 * Setup the np->np_sockaddr from the passed sockaddr setup
3077 * in iscsi_target_configfs.c code..
3078 */
3079 memcpy(&np->np_sockaddr, ksockaddr,
3080 sizeof(struct sockaddr_storage));
3081
3082 isert_lid = isert_setup_id(isert_np);
3083 if (IS_ERR(isert_lid)) {
3084 ret = PTR_ERR(isert_lid);
3085 goto out;
3086 }
3087
3088 isert_np->cm_id = isert_lid;
3089 np->np_context = isert_np;
3090
3091 return 0;
3092
3093 out:
3094 kfree(isert_np);
3095
3096 return ret;
3097 }
3098
3099 static int
3100 isert_rdma_accept(struct isert_conn *isert_conn)
3101 {
3102 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3103 struct rdma_conn_param cp;
3104 int ret;
3105 struct iser_cm_hdr rsp_hdr;
3106
3107 memset(&cp, 0, sizeof(struct rdma_conn_param));
3108 cp.initiator_depth = isert_conn->initiator_depth;
3109 cp.retry_count = 7;
3110 cp.rnr_retry_count = 7;
3111
3112 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
3113 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
3114 if (!isert_conn->snd_w_inv)
3115 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
3116 cp.private_data = (void *)&rsp_hdr;
3117 cp.private_data_len = sizeof(rsp_hdr);
3118
3119 ret = rdma_accept(cm_id, &cp);
3120 if (ret) {
3121 isert_err("rdma_accept() failed with: %d\n", ret);
3122 return ret;
3123 }
3124
3125 return 0;
3126 }
3127
3128 static int
3129 isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3130 {
3131 struct isert_conn *isert_conn = conn->context;
3132 int ret;
3133
3134 isert_info("before login_req comp conn: %p\n", isert_conn);
3135 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
3136 if (ret) {
3137 isert_err("isert_conn %p interrupted before got login req\n",
3138 isert_conn);
3139 return ret;
3140 }
3141 reinit_completion(&isert_conn->login_req_comp);
3142
3143 /*
3144 * For login requests after the first PDU, isert_rx_login_req() will
3145 * kick schedule_delayed_work(&conn->login_work) as the packet is
3146 * received, which turns this callback from iscsi_target_do_login_rx()
3147 * into a NOP.
3148 */
3149 if (!login->first_request)
3150 return 0;
3151
3152 isert_rx_login_req(isert_conn);
3153
3154 isert_info("before login_comp conn: %p\n", conn);
3155 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
3156 if (ret)
3157 return ret;
3158
3159 isert_info("processing login->req: %p\n", login->req);
3160
3161 return 0;
3162 }
3163
3164 static void
3165 isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3166 struct isert_conn *isert_conn)
3167 {
3168 struct rdma_cm_id *cm_id = isert_conn->cm_id;
3169 struct rdma_route *cm_route = &cm_id->route;
3170
3171 conn->login_family = np->np_sockaddr.ss_family;
3172
3173 conn->login_sockaddr = cm_route->addr.dst_addr;
3174 conn->local_sockaddr = cm_route->addr.src_addr;
3175 }
3176
3177 static int
3178 isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3179 {
3180 struct isert_np *isert_np = np->np_context;
3181 struct isert_conn *isert_conn;
3182 int ret;
3183
3184 accept_wait:
3185 ret = down_interruptible(&isert_np->sem);
3186 if (ret)
3187 return -ENODEV;
3188
3189 spin_lock_bh(&np->np_thread_lock);
3190 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
3191 spin_unlock_bh(&np->np_thread_lock);
3192 isert_dbg("np_thread_state %d\n",
3193 np->np_thread_state);
3194 /**
3195 * No point in stalling here when np_thread
3196 * is in state RESET/SHUTDOWN/EXIT - bail
3197 **/
3198 return -ENODEV;
3199 }
3200 spin_unlock_bh(&np->np_thread_lock);
3201
3202 mutex_lock(&isert_np->mutex);
3203 if (list_empty(&isert_np->pending)) {
3204 mutex_unlock(&isert_np->mutex);
3205 goto accept_wait;
3206 }
3207 isert_conn = list_first_entry(&isert_np->pending,
3208 struct isert_conn, node);
3209 list_del_init(&isert_conn->node);
3210 mutex_unlock(&isert_np->mutex);
3211
3212 conn->context = isert_conn;
3213 isert_conn->conn = conn;
3214
3215 isert_set_conn_info(np, conn, isert_conn);
3216
3217 isert_dbg("Processing isert_conn: %p\n", isert_conn);
3218
3219 return 0;
3220 }
3221
3222 static void
3223 isert_free_np(struct iscsi_np *np)
3224 {
3225 struct isert_np *isert_np = np->np_context;
3226 struct isert_conn *isert_conn, *n;
3227
3228 if (isert_np->cm_id)
3229 rdma_destroy_id(isert_np->cm_id);
3230
3231 /*
3232 * FIXME: At this point we don't have a good way to insure
3233 * that at this point we don't have hanging connections that
3234 * completed RDMA establishment but didn't start iscsi login
3235 * process. So work-around this by cleaning up what ever piled
3236 * up in accepted and pending lists.
3237 */
3238 mutex_lock(&isert_np->mutex);
3239 if (!list_empty(&isert_np->pending)) {
3240 isert_info("Still have isert pending connections\n");
3241 list_for_each_entry_safe(isert_conn, n,
3242 &isert_np->pending,
3243 node) {
3244 isert_info("cleaning isert_conn %p state (%d)\n",
3245 isert_conn, isert_conn->state);
3246 isert_connect_release(isert_conn);
3247 }
3248 }
3249
3250 if (!list_empty(&isert_np->accepted)) {
3251 isert_info("Still have isert accepted connections\n");
3252 list_for_each_entry_safe(isert_conn, n,
3253 &isert_np->accepted,
3254 node) {
3255 isert_info("cleaning isert_conn %p state (%d)\n",
3256 isert_conn, isert_conn->state);
3257 isert_connect_release(isert_conn);
3258 }
3259 }
3260 mutex_unlock(&isert_np->mutex);
3261
3262 np->np_context = NULL;
3263 kfree(isert_np);
3264 }
3265
3266 static void isert_release_work(struct work_struct *work)
3267 {
3268 struct isert_conn *isert_conn = container_of(work,
3269 struct isert_conn,
3270 release_work);
3271
3272 isert_info("Starting release conn %p\n", isert_conn);
3273
3274 wait_for_completion(&isert_conn->wait);
3275
3276 mutex_lock(&isert_conn->mutex);
3277 isert_conn->state = ISER_CONN_DOWN;
3278 mutex_unlock(&isert_conn->mutex);
3279
3280 isert_info("Destroying conn %p\n", isert_conn);
3281 isert_put_conn(isert_conn);
3282 }
3283
3284 static void
3285 isert_wait4logout(struct isert_conn *isert_conn)
3286 {
3287 struct iscsi_conn *conn = isert_conn->conn;
3288
3289 isert_info("conn %p\n", isert_conn);
3290
3291 if (isert_conn->logout_posted) {
3292 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
3293 wait_for_completion_timeout(&conn->conn_logout_comp,
3294 SECONDS_FOR_LOGOUT_COMP * HZ);
3295 }
3296 }
3297
3298 static void
3299 isert_wait4cmds(struct iscsi_conn *conn)
3300 {
3301 isert_info("iscsi_conn %p\n", conn);
3302
3303 if (conn->sess) {
3304 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
3305 target_wait_for_sess_cmds(conn->sess->se_sess);
3306 }
3307 }
3308
3309 static void
3310 isert_wait4flush(struct isert_conn *isert_conn)
3311 {
3312 struct ib_recv_wr *bad_wr;
3313
3314 isert_info("conn %p\n", isert_conn);
3315
3316 init_completion(&isert_conn->wait_comp_err);
3317 isert_conn->beacon.wr_id = ISER_BEACON_WRID;
3318 /* post an indication that all flush errors were consumed */
3319 if (ib_post_recv(isert_conn->qp, &isert_conn->beacon, &bad_wr)) {
3320 isert_err("conn %p failed to post beacon", isert_conn);
3321 return;
3322 }
3323
3324 wait_for_completion(&isert_conn->wait_comp_err);
3325 }
3326
3327 /**
3328 * isert_put_unsol_pending_cmds() - Drop commands waiting for
3329 * unsolicitate dataout
3330 * @conn: iscsi connection
3331 *
3332 * We might still have commands that are waiting for unsolicited
3333 * dataouts messages. We must put the extra reference on those
3334 * before blocking on the target_wait_for_session_cmds
3335 */
3336 static void
3337 isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
3338 {
3339 struct iscsi_cmd *cmd, *tmp;
3340 static LIST_HEAD(drop_cmd_list);
3341
3342 spin_lock_bh(&conn->cmd_lock);
3343 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
3344 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
3345 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
3346 (cmd->write_data_done < cmd->se_cmd.data_length))
3347 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
3348 }
3349 spin_unlock_bh(&conn->cmd_lock);
3350
3351 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
3352 list_del_init(&cmd->i_conn_node);
3353 if (cmd->i_state != ISTATE_REMOVE) {
3354 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
3355
3356 isert_info("conn %p dropping cmd %p\n", conn, cmd);
3357 isert_put_cmd(isert_cmd, true);
3358 }
3359 }
3360 }
3361
3362 static void isert_wait_conn(struct iscsi_conn *conn)
3363 {
3364 struct isert_conn *isert_conn = conn->context;
3365
3366 isert_info("Starting conn %p\n", isert_conn);
3367
3368 mutex_lock(&isert_conn->mutex);
3369 /*
3370 * Only wait for wait_comp_err if the isert_conn made it
3371 * into full feature phase..
3372 */
3373 if (isert_conn->state == ISER_CONN_INIT) {
3374 mutex_unlock(&isert_conn->mutex);
3375 return;
3376 }
3377 isert_conn_terminate(isert_conn);
3378 mutex_unlock(&isert_conn->mutex);
3379
3380 isert_wait4flush(isert_conn);
3381 isert_put_unsol_pending_cmds(conn);
3382 isert_wait4cmds(conn);
3383 isert_wait4logout(isert_conn);
3384
3385 queue_work(isert_release_wq, &isert_conn->release_work);
3386 }
3387
3388 static void isert_free_conn(struct iscsi_conn *conn)
3389 {
3390 struct isert_conn *isert_conn = conn->context;
3391
3392 isert_wait4flush(isert_conn);
3393 isert_put_conn(isert_conn);
3394 }
3395
3396 static struct iscsit_transport iser_target_transport = {
3397 .name = "IB/iSER",
3398 .transport_type = ISCSI_INFINIBAND,
3399 .priv_size = sizeof(struct isert_cmd),
3400 .owner = THIS_MODULE,
3401 .iscsit_setup_np = isert_setup_np,
3402 .iscsit_accept_np = isert_accept_np,
3403 .iscsit_free_np = isert_free_np,
3404 .iscsit_wait_conn = isert_wait_conn,
3405 .iscsit_free_conn = isert_free_conn,
3406 .iscsit_get_login_rx = isert_get_login_rx,
3407 .iscsit_put_login_tx = isert_put_login_tx,
3408 .iscsit_immediate_queue = isert_immediate_queue,
3409 .iscsit_response_queue = isert_response_queue,
3410 .iscsit_get_dataout = isert_get_dataout,
3411 .iscsit_queue_data_in = isert_put_datain,
3412 .iscsit_queue_status = isert_put_response,
3413 .iscsit_aborted_task = isert_aborted_task,
3414 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
3415 };
3416
3417 static int __init isert_init(void)
3418 {
3419 int ret;
3420
3421 isert_comp_wq = alloc_workqueue("isert_comp_wq",
3422 WQ_UNBOUND | WQ_HIGHPRI, 0);
3423 if (!isert_comp_wq) {
3424 isert_err("Unable to allocate isert_comp_wq\n");
3425 ret = -ENOMEM;
3426 return -ENOMEM;
3427 }
3428
3429 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
3430 WQ_UNBOUND_MAX_ACTIVE);
3431 if (!isert_release_wq) {
3432 isert_err("Unable to allocate isert_release_wq\n");
3433 ret = -ENOMEM;
3434 goto destroy_comp_wq;
3435 }
3436
3437 iscsit_register_transport(&iser_target_transport);
3438 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
3439
3440 return 0;
3441
3442 destroy_comp_wq:
3443 destroy_workqueue(isert_comp_wq);
3444
3445 return ret;
3446 }
3447
3448 static void __exit isert_exit(void)
3449 {
3450 flush_scheduled_work();
3451 destroy_workqueue(isert_release_wq);
3452 destroy_workqueue(isert_comp_wq);
3453 iscsit_unregister_transport(&iser_target_transport);
3454 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
3455 }
3456
3457 MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3458 MODULE_VERSION("1.0");
3459 MODULE_AUTHOR("nab@Linux-iSCSI.org");
3460 MODULE_LICENSE("GPL");
3461
3462 module_init(isert_init);
3463 module_exit(isert_exit);
Linux kernel - Deliverables
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