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Merge tag 'pci-v3.15-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[deliverable/linux.git] / drivers / infiniband / ulp / isert / ib_isert.c
CommitLineData
b8d26b3b
NB		 1/*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4c76251e 4 * (c) Copyright 2013 Datera, Inc.
b8d26b3b
NB		 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>
95b60f07 25#include <linux/llist.h>
b8d26b3b
NB		 26#include <rdma/ib_verbs.h>
27#include <rdma/rdma_cm.h>
28#include <target/target_core_base.h>
29#include <target/target_core_fabric.h>
30#include <target/iscsi/iscsi_transport.h>
31
32#include "isert_proto.h"
33#include "ib_isert.h"
34
35#define ISERT_MAX_CONN 8
36#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
37#define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
38
39static DEFINE_MUTEX(device_list_mutex);
40static LIST_HEAD(device_list);
41static struct workqueue_struct *isert_rx_wq;
42static struct workqueue_struct *isert_comp_wq;
b8d26b3b 43
d40945d8
VP		 44static void
45isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
46static int
47isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
48 struct isert_rdma_wr *wr);
59464ef4 49static void
a3a5a826 50isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
59464ef4 51static int
a3a5a826
SG		 52isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
53 struct isert_rdma_wr *wr);
d40945d8 54
b8d26b3b
NB		 55static void
56isert_qp_event_callback(struct ib_event *e, void *context)
57{
58 struct isert_conn *isert_conn = (struct isert_conn *)context;
59
60 pr_err("isert_qp_event_callback event: %d\n", e->event);
61 switch (e->event) {
62 case IB_EVENT_COMM_EST:
63 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
64 break;
65 case IB_EVENT_QP_LAST_WQE_REACHED:
66 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
67 break;
68 default:
69 break;
70 }
71}
72
73static int
74isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
75{
76 int ret;
77
78 ret = ib_query_device(ib_dev, devattr);
79 if (ret) {
80 pr_err("ib_query_device() failed: %d\n", ret);
81 return ret;
82 }
83 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
84 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
85
86 return 0;
87}
88
89static int
90isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
91{
92 struct isert_device *device = isert_conn->conn_device;
93 struct ib_qp_init_attr attr;
b8d26b3b
NB		 94 int ret, index, min_index = 0;
95
b8d26b3b
NB		 96 mutex_lock(&device_list_mutex);
97 for (index = 0; index < device->cqs_used; index++)
98 if (device->cq_active_qps[index] <
99 device->cq_active_qps[min_index])
100 min_index = index;
101 device->cq_active_qps[min_index]++;
102 pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
103 mutex_unlock(&device_list_mutex);
104
105 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
106 attr.event_handler = isert_qp_event_callback;
107 attr.qp_context = isert_conn;
108 attr.send_cq = device->dev_tx_cq[min_index];
109 attr.recv_cq = device->dev_rx_cq[min_index];
110 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
111 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
112 /*
113 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
114 * work-around for RDMA_READ..
115 */
59464ef4 116 attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
b8d26b3b
NB		 117 isert_conn->max_sge = attr.cap.max_send_sge;
118
119 attr.cap.max_recv_sge = 1;
120 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
121 attr.qp_type = IB_QPT_RC;
122
123 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
124 cma_id->device);
125 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
126 isert_conn->conn_pd->device);
127
128 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
129 if (ret) {
130 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
131 return ret;
132 }
133 isert_conn->conn_qp = cma_id->qp;
134 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
135
136 return 0;
137}
138
139static void
140isert_cq_event_callback(struct ib_event *e, void *context)
141{
142 pr_debug("isert_cq_event_callback event: %d\n", e->event);
143}
144
145static int
146isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
147{
148 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
149 struct iser_rx_desc *rx_desc;
150 struct ib_sge *rx_sg;
151 u64 dma_addr;
152 int i, j;
153
154 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
155 sizeof(struct iser_rx_desc), GFP_KERNEL);
156 if (!isert_conn->conn_rx_descs)
157 goto fail;
158
159 rx_desc = isert_conn->conn_rx_descs;
160
161 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
162 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
163 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
164 if (ib_dma_mapping_error(ib_dev, dma_addr))
165 goto dma_map_fail;
166
167 rx_desc->dma_addr = dma_addr;
168
169 rx_sg = &rx_desc->rx_sg;
170 rx_sg->addr = rx_desc->dma_addr;
171 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
172 rx_sg->lkey = isert_conn->conn_mr->lkey;
173 }
174
175 isert_conn->conn_rx_desc_head = 0;
176 return 0;
177
178dma_map_fail:
179 rx_desc = isert_conn->conn_rx_descs;
180 for (j = 0; j < i; j++, rx_desc++) {
181 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
182 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
183 }
184 kfree(isert_conn->conn_rx_descs);
185 isert_conn->conn_rx_descs = NULL;
186fail:
187 return -ENOMEM;
188}
189
190static void
191isert_free_rx_descriptors(struct isert_conn *isert_conn)
192{
193 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
194 struct iser_rx_desc *rx_desc;
195 int i;
196
197 if (!isert_conn->conn_rx_descs)
198 return;
199
200 rx_desc = isert_conn->conn_rx_descs;
201 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
202 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
203 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
204 }
205
206 kfree(isert_conn->conn_rx_descs);
207 isert_conn->conn_rx_descs = NULL;
208}
209
2853c2b6 210static void isert_cq_tx_work(struct work_struct *);
b8d26b3b 211static void isert_cq_tx_callback(struct ib_cq *, void *);
2853c2b6 212static void isert_cq_rx_work(struct work_struct *);
b8d26b3b
NB		 213static void isert_cq_rx_callback(struct ib_cq *, void *);
214
215static int
216isert_create_device_ib_res(struct isert_device *device)
217{
218 struct ib_device *ib_dev = device->ib_device;
219 struct isert_cq_desc *cq_desc;
59464ef4 220 struct ib_device_attr *dev_attr;
b8d26b3b
NB		 221 int ret = 0, i, j;
222
59464ef4
VP		 223 dev_attr = &device->dev_attr;
224 ret = isert_query_device(ib_dev, dev_attr);
225 if (ret)
226 return ret;
227
d40945d8 228 /* asign function handlers */
59464ef4 229 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS) {
a3a5a826
SG		 230 device->use_fastreg = 1;
231 device->reg_rdma_mem = isert_reg_rdma;
232 device->unreg_rdma_mem = isert_unreg_rdma;
59464ef4 233 } else {
a3a5a826 234 device->use_fastreg = 0;
59464ef4
VP		 235 device->reg_rdma_mem = isert_map_rdma;
236 device->unreg_rdma_mem = isert_unmap_cmd;
237 }
d40945d8 238
b8d26b3b
NB		 239 device->cqs_used = min_t(int, num_online_cpus(),
240 device->ib_device->num_comp_vectors);
241 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
a3a5a826
SG		 242 pr_debug("Using %d CQs, device %s supports %d vectors support "
243 "Fast registration %d\n",
b8d26b3b 244 device->cqs_used, device->ib_device->name,
a3a5a826 245 device->ib_device->num_comp_vectors, device->use_fastreg);
b8d26b3b
NB		 246 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
247 device->cqs_used, GFP_KERNEL);
248 if (!device->cq_desc) {
249 pr_err("Unable to allocate device->cq_desc\n");
250 return -ENOMEM;
251 }
252 cq_desc = device->cq_desc;
253
b8d26b3b
NB		 254 for (i = 0; i < device->cqs_used; i++) {
255 cq_desc[i].device = device;
256 cq_desc[i].cq_index = i;
257
2853c2b6 258 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
b8d26b3b
NB		 259 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
260 isert_cq_rx_callback,
261 isert_cq_event_callback,
262 (void *)&cq_desc[i],
263 ISER_MAX_RX_CQ_LEN, i);
94a71110
WY		 264 if (IS_ERR(device->dev_rx_cq[i])) {
265 ret = PTR_ERR(device->dev_rx_cq[i]);
266 device->dev_rx_cq[i] = NULL;
b8d26b3b 267 goto out_cq;
94a71110 268 }
b8d26b3b 269
2853c2b6 270 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
b8d26b3b
NB		 271 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
272 isert_cq_tx_callback,
273 isert_cq_event_callback,
274 (void *)&cq_desc[i],
275 ISER_MAX_TX_CQ_LEN, i);
94a71110
WY		 276 if (IS_ERR(device->dev_tx_cq[i])) {
277 ret = PTR_ERR(device->dev_tx_cq[i]);
278 device->dev_tx_cq[i] = NULL;
b8d26b3b 279 goto out_cq;
94a71110 280 }
b8d26b3b 281
94a71110
WY		 282 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
283 if (ret)
b8d26b3b
NB		 284 goto out_cq;
285
94a71110
WY		 286 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
287 if (ret)
b8d26b3b
NB		 288 goto out_cq;
289 }
290
b8d26b3b
NB		 291 return 0;
292
293out_cq:
294 for (j = 0; j < i; j++) {
295 cq_desc = &device->cq_desc[j];
296
297 if (device->dev_rx_cq[j]) {
298 cancel_work_sync(&cq_desc->cq_rx_work);
299 ib_destroy_cq(device->dev_rx_cq[j]);
300 }
301 if (device->dev_tx_cq[j]) {
302 cancel_work_sync(&cq_desc->cq_tx_work);
303 ib_destroy_cq(device->dev_tx_cq[j]);
304 }
305 }
b8d26b3b
NB		 306 kfree(device->cq_desc);
307
308 return ret;
309}
310
311static void
312isert_free_device_ib_res(struct isert_device *device)
313{
314 struct isert_cq_desc *cq_desc;
315 int i;
316
317 for (i = 0; i < device->cqs_used; i++) {
318 cq_desc = &device->cq_desc[i];
319
320 cancel_work_sync(&cq_desc->cq_rx_work);
321 cancel_work_sync(&cq_desc->cq_tx_work);
322 ib_destroy_cq(device->dev_rx_cq[i]);
323 ib_destroy_cq(device->dev_tx_cq[i]);
324 device->dev_rx_cq[i] = NULL;
325 device->dev_tx_cq[i] = NULL;
326 }
327
b8d26b3b
NB		 328 kfree(device->cq_desc);
329}
330
331static void
332isert_device_try_release(struct isert_device *device)
333{
334 mutex_lock(&device_list_mutex);
335 device->refcount--;
336 if (!device->refcount) {
337 isert_free_device_ib_res(device);
338 list_del(&device->dev_node);
339 kfree(device);
340 }
341 mutex_unlock(&device_list_mutex);
342}
343
344static struct isert_device *
345isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
346{
347 struct isert_device *device;
348 int ret;
349
350 mutex_lock(&device_list_mutex);
351 list_for_each_entry(device, &device_list, dev_node) {
352 if (device->ib_device->node_guid == cma_id->device->node_guid) {
353 device->refcount++;
354 mutex_unlock(&device_list_mutex);
355 return device;
356 }
357 }
358
359 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
360 if (!device) {
361 mutex_unlock(&device_list_mutex);
362 return ERR_PTR(-ENOMEM);
363 }
364
365 INIT_LIST_HEAD(&device->dev_node);
366
367 device->ib_device = cma_id->device;
368 ret = isert_create_device_ib_res(device);
369 if (ret) {
370 kfree(device);
371 mutex_unlock(&device_list_mutex);
372 return ERR_PTR(ret);
373 }
374
375 device->refcount++;
376 list_add_tail(&device->dev_node, &device_list);
377 mutex_unlock(&device_list_mutex);
378
379 return device;
380}
381
59464ef4 382static void
a3a5a826 383isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
59464ef4
VP		 384{
385 struct fast_reg_descriptor *fr_desc, *tmp;
386 int i = 0;
387
a3a5a826 388 if (list_empty(&isert_conn->conn_fr_pool))
59464ef4
VP		 389 return;
390
a3a5a826 391 pr_debug("Freeing conn %p fastreg pool", isert_conn);
59464ef4
VP		 392
393 list_for_each_entry_safe(fr_desc, tmp,
a3a5a826 394 &isert_conn->conn_fr_pool, list) {
59464ef4
VP		 395 list_del(&fr_desc->list);
396 ib_free_fast_reg_page_list(fr_desc->data_frpl);
397 ib_dereg_mr(fr_desc->data_mr);
398 kfree(fr_desc);
399 ++i;
400 }
401
a3a5a826 402 if (i < isert_conn->conn_fr_pool_size)
59464ef4 403 pr_warn("Pool still has %d regions registered\n",
a3a5a826 404 isert_conn->conn_fr_pool_size - i);
59464ef4
VP		 405}
406
dc87a90f
SG		 407static int
408isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
409 struct fast_reg_descriptor *fr_desc)
410{
411 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
412 ISCSI_ISER_SG_TABLESIZE);
413 if (IS_ERR(fr_desc->data_frpl)) {
414 pr_err("Failed to allocate data frpl err=%ld\n",
415 PTR_ERR(fr_desc->data_frpl));
416 return PTR_ERR(fr_desc->data_frpl);
417 }
418
419 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
420 if (IS_ERR(fr_desc->data_mr)) {
421 pr_err("Failed to allocate data frmr err=%ld\n",
422 PTR_ERR(fr_desc->data_mr));
423 ib_free_fast_reg_page_list(fr_desc->data_frpl);
424 return PTR_ERR(fr_desc->data_mr);
425 }
426 pr_debug("Create fr_desc %p page_list %p\n",
427 fr_desc, fr_desc->data_frpl->page_list);
428
429 fr_desc->valid = true;
430
431 return 0;
59464ef4
VP		 432}
433
434static int
a3a5a826 435isert_conn_create_fastreg_pool(struct isert_conn *isert_conn)
59464ef4
VP		 436{
437 struct fast_reg_descriptor *fr_desc;
438 struct isert_device *device = isert_conn->conn_device;
439 int i, ret;
440
a3a5a826
SG		 441 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
442 isert_conn->conn_fr_pool_size = 0;
59464ef4
VP		 443 for (i = 0; i < ISCSI_DEF_XMIT_CMDS_MAX; i++) {
444 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
445 if (!fr_desc) {
446 pr_err("Failed to allocate fast_reg descriptor\n");
447 ret = -ENOMEM;
448 goto err;
449 }
450
dc87a90f
SG		 451 ret = isert_create_fr_desc(device->ib_device,
452 isert_conn->conn_pd, fr_desc);
453 if (ret) {
454 pr_err("Failed to create fastreg descriptor err=%d\n",
455 ret);
a80e21b3 456 kfree(fr_desc);
59464ef4
VP		 457 goto err;
458 }
59464ef4 459
a3a5a826
SG		 460 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
461 isert_conn->conn_fr_pool_size++;
59464ef4
VP		 462 }
463
a3a5a826
SG		 464 pr_debug("Creating conn %p fastreg pool size=%d",
465 isert_conn, isert_conn->conn_fr_pool_size);
59464ef4
VP		 466
467 return 0;
468
469err:
a3a5a826 470 isert_conn_free_fastreg_pool(isert_conn);
59464ef4
VP		 471 return ret;
472}
473
b8d26b3b
NB		 474static int
475isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
476{
477 struct iscsi_np *np = cma_id->context;
478 struct isert_np *isert_np = np->np_context;
479 struct isert_conn *isert_conn;
480 struct isert_device *device;
481 struct ib_device *ib_dev = cma_id->device;
482 int ret = 0;
483
484 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
485 cma_id, cma_id->context);
486
487 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
488 if (!isert_conn) {
489 pr_err("Unable to allocate isert_conn\n");
490 return -ENOMEM;
491 }
492 isert_conn->state = ISER_CONN_INIT;
493 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
494 init_completion(&isert_conn->conn_login_comp);
defd8848
NB		 495 init_completion(&isert_conn->conn_wait);
496 init_completion(&isert_conn->conn_wait_comp_err);
b8d26b3b
NB		 497 kref_init(&isert_conn->conn_kref);
498 kref_get(&isert_conn->conn_kref);
b2cb9649 499 mutex_init(&isert_conn->conn_mutex);
59464ef4 500 spin_lock_init(&isert_conn->conn_lock);
b8d26b3b
NB		 501
502 cma_id->context = isert_conn;
503 isert_conn->conn_cm_id = cma_id;
504 isert_conn->responder_resources = event->param.conn.responder_resources;
505 isert_conn->initiator_depth = event->param.conn.initiator_depth;
506 pr_debug("Using responder_resources: %u initiator_depth: %u\n",
507 isert_conn->responder_resources, isert_conn->initiator_depth);
508
509 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
510 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
511 if (!isert_conn->login_buf) {
512 pr_err("Unable to allocate isert_conn->login_buf\n");
513 ret = -ENOMEM;
514 goto out;
515 }
516
517 isert_conn->login_req_buf = isert_conn->login_buf;
518 isert_conn->login_rsp_buf = isert_conn->login_buf +
519 ISCSI_DEF_MAX_RECV_SEG_LEN;
520 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
521 isert_conn->login_buf, isert_conn->login_req_buf,
522 isert_conn->login_rsp_buf);
523
524 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
525 (void *)isert_conn->login_req_buf,
526 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
527
528 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
529 if (ret) {
530 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
531 ret);
532 isert_conn->login_req_dma = 0;
533 goto out_login_buf;
534 }
535
536 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
537 (void *)isert_conn->login_rsp_buf,
538 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
539
540 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
541 if (ret) {
542 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
543 ret);
544 isert_conn->login_rsp_dma = 0;
545 goto out_req_dma_map;
546 }
547
548 device = isert_device_find_by_ib_dev(cma_id);
549 if (IS_ERR(device)) {
550 ret = PTR_ERR(device);
551 goto out_rsp_dma_map;
552 }
553
554 isert_conn->conn_device = device;
eb6ab132
SG		 555 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
556 if (IS_ERR(isert_conn->conn_pd)) {
557 ret = PTR_ERR(isert_conn->conn_pd);
558 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
559 isert_conn, ret);
560 goto out_pd;
561 }
b8d26b3b 562
eb6ab132
SG		 563 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
564 IB_ACCESS_LOCAL_WRITE);
565 if (IS_ERR(isert_conn->conn_mr)) {
566 ret = PTR_ERR(isert_conn->conn_mr);
567 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
568 isert_conn, ret);
569 goto out_mr;
570 }
b8d26b3b 571
a3a5a826
SG		 572 if (device->use_fastreg) {
573 ret = isert_conn_create_fastreg_pool(isert_conn);
59464ef4 574 if (ret) {
a3a5a826
SG		 575 pr_err("Conn: %p failed to create fastreg pool\n",
576 isert_conn);
577 goto out_fastreg;
59464ef4
VP		 578 }
579 }
580
b8d26b3b
NB		 581 ret = isert_conn_setup_qp(isert_conn, cma_id);
582 if (ret)
583 goto out_conn_dev;
584
585 mutex_lock(&isert_np->np_accept_mutex);
586 list_add_tail(&isert_np->np_accept_list, &isert_conn->conn_accept_node);
587 mutex_unlock(&isert_np->np_accept_mutex);
588
589 pr_debug("isert_connect_request() waking up np_accept_wq: %p\n", np);
590 wake_up(&isert_np->np_accept_wq);
591 return 0;
592
593out_conn_dev:
a3a5a826
SG		 594 if (device->use_fastreg)
595 isert_conn_free_fastreg_pool(isert_conn);
596out_fastreg:
eb6ab132
SG		 597 ib_dereg_mr(isert_conn->conn_mr);
598out_mr:
599 ib_dealloc_pd(isert_conn->conn_pd);
600out_pd:
b8d26b3b
NB		 601 isert_device_try_release(device);
602out_rsp_dma_map:
603 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
604 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
605out_req_dma_map:
606 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
607 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
608out_login_buf:
609 kfree(isert_conn->login_buf);
610out:
611 kfree(isert_conn);
612 return ret;
613}
614
615static void
616isert_connect_release(struct isert_conn *isert_conn)
617{
618 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
619 struct isert_device *device = isert_conn->conn_device;
620 int cq_index;
621
622 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
623
a3a5a826
SG		 624 if (device && device->use_fastreg)
625 isert_conn_free_fastreg_pool(isert_conn);
59464ef4 626
b8d26b3b
NB		 627 if (isert_conn->conn_qp) {
628 cq_index = ((struct isert_cq_desc *)
629 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
630 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
631 isert_conn->conn_device->cq_active_qps[cq_index]--;
632
633 rdma_destroy_qp(isert_conn->conn_cm_id);
634 }
635
636 isert_free_rx_descriptors(isert_conn);
637 rdma_destroy_id(isert_conn->conn_cm_id);
638
eb6ab132
SG		 639 ib_dereg_mr(isert_conn->conn_mr);
640 ib_dealloc_pd(isert_conn->conn_pd);
641
b8d26b3b
NB		 642 if (isert_conn->login_buf) {
643 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
644 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
645 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
646 ISCSI_DEF_MAX_RECV_SEG_LEN,
647 DMA_FROM_DEVICE);
648 kfree(isert_conn->login_buf);
649 }
650 kfree(isert_conn);
651
652 if (device)
653 isert_device_try_release(device);
654
655 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
656}
657
658static void
659isert_connected_handler(struct rdma_cm_id *cma_id)
660{
661 return;
662}
663
664static void
665isert_release_conn_kref(struct kref *kref)
666{
667 struct isert_conn *isert_conn = container_of(kref,
668 struct isert_conn, conn_kref);
669
670 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
671 current->comm, current->pid);
672
673 isert_connect_release(isert_conn);
674}
675
676static void
677isert_put_conn(struct isert_conn *isert_conn)
678{
679 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
680}
681
682static void
683isert_disconnect_work(struct work_struct *work)
684{
685 struct isert_conn *isert_conn = container_of(work,
686 struct isert_conn, conn_logout_work);
687
688 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
b2cb9649 689 mutex_lock(&isert_conn->conn_mutex);
defd8848
NB		 690 if (isert_conn->state == ISER_CONN_UP)
691 isert_conn->state = ISER_CONN_TERMINATING;
b8d26b3b
NB		 692
693 if (isert_conn->post_recv_buf_count == 0 &&
694 atomic_read(&isert_conn->post_send_buf_count) == 0) {
b2cb9649
NB		 695 mutex_unlock(&isert_conn->conn_mutex);
696 goto wake_up;
697 }
698 if (!isert_conn->conn_cm_id) {
699 mutex_unlock(&isert_conn->conn_mutex);
700 isert_put_conn(isert_conn);
701 return;
b8d26b3b 702 }
b2cb9649
NB		 703 if (!isert_conn->logout_posted) {
704 pr_debug("Calling rdma_disconnect for !logout_posted from"
705 " isert_disconnect_work\n");
706 rdma_disconnect(isert_conn->conn_cm_id);
707 mutex_unlock(&isert_conn->conn_mutex);
708 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
709 goto wake_up;
b8d26b3b 710 }
b2cb9649 711 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 712
b2cb9649 713wake_up:
defd8848 714 complete(&isert_conn->conn_wait);
b8d26b3b
NB		 715 isert_put_conn(isert_conn);
716}
717
718static void
719isert_disconnected_handler(struct rdma_cm_id *cma_id)
720{
721 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
722
723 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
724 schedule_work(&isert_conn->conn_logout_work);
725}
726
727static int
728isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
729{
730 int ret = 0;
731
732 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
733 event->event, event->status, cma_id->context, cma_id);
734
735 switch (event->event) {
736 case RDMA_CM_EVENT_CONNECT_REQUEST:
737 pr_debug("RDMA_CM_EVENT_CONNECT_REQUEST: >>>>>>>>>>>>>>>\n");
738 ret = isert_connect_request(cma_id, event);
739 break;
740 case RDMA_CM_EVENT_ESTABLISHED:
741 pr_debug("RDMA_CM_EVENT_ESTABLISHED >>>>>>>>>>>>>>\n");
742 isert_connected_handler(cma_id);
743 break;
744 case RDMA_CM_EVENT_DISCONNECTED:
745 pr_debug("RDMA_CM_EVENT_DISCONNECTED: >>>>>>>>>>>>>>\n");
746 isert_disconnected_handler(cma_id);
747 break;
748 case RDMA_CM_EVENT_DEVICE_REMOVAL:
749 case RDMA_CM_EVENT_ADDR_CHANGE:
750 break;
751 case RDMA_CM_EVENT_CONNECT_ERROR:
752 default:
753 pr_err("Unknown RDMA CMA event: %d\n", event->event);
754 break;
755 }
756
757 if (ret != 0) {
758 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
759 event->event, ret);
760 dump_stack();
761 }
762
763 return ret;
764}
765
766static int
767isert_post_recv(struct isert_conn *isert_conn, u32 count)
768{
769 struct ib_recv_wr *rx_wr, *rx_wr_failed;
770 int i, ret;
771 unsigned int rx_head = isert_conn->conn_rx_desc_head;
772 struct iser_rx_desc *rx_desc;
773
774 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
775 rx_desc = &isert_conn->conn_rx_descs[rx_head];
776 rx_wr->wr_id = (unsigned long)rx_desc;
777 rx_wr->sg_list = &rx_desc->rx_sg;
778 rx_wr->num_sge = 1;
779 rx_wr->next = rx_wr + 1;
780 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
781 }
782
783 rx_wr--;
784 rx_wr->next = NULL; /* mark end of work requests list */
785
786 isert_conn->post_recv_buf_count += count;
787 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
788 &rx_wr_failed);
789 if (ret) {
790 pr_err("ib_post_recv() failed with ret: %d\n", ret);
791 isert_conn->post_recv_buf_count -= count;
792 } else {
793 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
794 isert_conn->conn_rx_desc_head = rx_head;
795 }
796 return ret;
797}
798
799static int
800isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
801{
802 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
803 struct ib_send_wr send_wr, *send_wr_failed;
804 int ret;
805
806 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
807 ISER_HEADERS_LEN, DMA_TO_DEVICE);
808
809 send_wr.next = NULL;
810 send_wr.wr_id = (unsigned long)tx_desc;
811 send_wr.sg_list = tx_desc->tx_sg;
812 send_wr.num_sge = tx_desc->num_sge;
813 send_wr.opcode = IB_WR_SEND;
814 send_wr.send_flags = IB_SEND_SIGNALED;
815
816 atomic_inc(&isert_conn->post_send_buf_count);
817
818 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
819 if (ret) {
820 pr_err("ib_post_send() failed, ret: %d\n", ret);
821 atomic_dec(&isert_conn->post_send_buf_count);
822 }
823
824 return ret;
825}
826
827static void
828isert_create_send_desc(struct isert_conn *isert_conn,
829 struct isert_cmd *isert_cmd,
830 struct iser_tx_desc *tx_desc)
831{
832 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
833
834 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
835 ISER_HEADERS_LEN, DMA_TO_DEVICE);
836
837 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
838 tx_desc->iser_header.flags = ISER_VER;
839
840 tx_desc->num_sge = 1;
841 tx_desc->isert_cmd = isert_cmd;
842
843 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
844 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
845 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
846 }
847}
848
849static int
850isert_init_tx_hdrs(struct isert_conn *isert_conn,
851 struct iser_tx_desc *tx_desc)
852{
853 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
854 u64 dma_addr;
855
856 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
857 ISER_HEADERS_LEN, DMA_TO_DEVICE);
858 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
859 pr_err("ib_dma_mapping_error() failed\n");
860 return -ENOMEM;
861 }
862
863 tx_desc->dma_addr = dma_addr;
864 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
865 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
866 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
867
868 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
869 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
870 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
871
872 return 0;
873}
874
875static void
95b60f07
NB		 876isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
877 struct ib_send_wr *send_wr, bool coalesce)
b8d26b3b 878{
95b60f07
NB		 879 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
880
b8d26b3b
NB		 881 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
882 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
883 send_wr->opcode = IB_WR_SEND;
95b60f07 884 send_wr->sg_list = &tx_desc->tx_sg[0];
b8d26b3b 885 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
95b60f07
NB		 886 /*
887 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
888 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
889 */
ebbe4421
NB		 890 mutex_lock(&isert_conn->conn_mutex);
891 if (coalesce && isert_conn->state == ISER_CONN_UP &&
95b60f07 892 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
ebbe4421 893 tx_desc->llnode_active = true;
95b60f07 894 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
ebbe4421 895 mutex_unlock(&isert_conn->conn_mutex);
95b60f07
NB		 896 return;
897 }
898 isert_conn->conn_comp_batch = 0;
899 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
ebbe4421 900 mutex_unlock(&isert_conn->conn_mutex);
95b60f07
NB		 901
902 send_wr->send_flags = IB_SEND_SIGNALED;
b8d26b3b
NB		 903}
904
905static int
906isert_rdma_post_recvl(struct isert_conn *isert_conn)
907{
908 struct ib_recv_wr rx_wr, *rx_wr_fail;
909 struct ib_sge sge;
910 int ret;
911
912 memset(&sge, 0, sizeof(struct ib_sge));
913 sge.addr = isert_conn->login_req_dma;
914 sge.length = ISER_RX_LOGIN_SIZE;
915 sge.lkey = isert_conn->conn_mr->lkey;
916
917 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
918 sge.addr, sge.length, sge.lkey);
919
920 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
921 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
922 rx_wr.sg_list = &sge;
923 rx_wr.num_sge = 1;
924
925 isert_conn->post_recv_buf_count++;
926 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
927 if (ret) {
928 pr_err("ib_post_recv() failed: %d\n", ret);
929 isert_conn->post_recv_buf_count--;
930 }
931
932 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
933 return ret;
934}
935
936static int
937isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
938 u32 length)
939{
940 struct isert_conn *isert_conn = conn->context;
941 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
942 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
943 int ret;
944
945 isert_create_send_desc(isert_conn, NULL, tx_desc);
946
947 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
948 sizeof(struct iscsi_hdr));
949
950 isert_init_tx_hdrs(isert_conn, tx_desc);
951
952 if (length > 0) {
953 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
954
955 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
956 length, DMA_TO_DEVICE);
957
958 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
959
960 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
961 length, DMA_TO_DEVICE);
962
963 tx_dsg->addr = isert_conn->login_rsp_dma;
964 tx_dsg->length = length;
965 tx_dsg->lkey = isert_conn->conn_mr->lkey;
966 tx_desc->num_sge = 2;
967 }
968 if (!login->login_failed) {
969 if (login->login_complete) {
970 ret = isert_alloc_rx_descriptors(isert_conn);
971 if (ret)
972 return ret;
973
974 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
975 if (ret)
976 return ret;
977
978 isert_conn->state = ISER_CONN_UP;
979 goto post_send;
980 }
981
982 ret = isert_rdma_post_recvl(isert_conn);
983 if (ret)
984 return ret;
985 }
986post_send:
987 ret = isert_post_send(isert_conn, tx_desc);
988 if (ret)
989 return ret;
990
991 return 0;
992}
993
994static void
995isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
996 struct isert_conn *isert_conn)
997{
998 struct iscsi_conn *conn = isert_conn->conn;
999 struct iscsi_login *login = conn->conn_login;
1000 int size;
1001
1002 if (!login) {
1003 pr_err("conn->conn_login is NULL\n");
1004 dump_stack();
1005 return;
1006 }
1007
1008 if (login->first_request) {
1009 struct iscsi_login_req *login_req =
1010 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1011 /*
1012 * Setup the initial iscsi_login values from the leading
1013 * login request PDU.
1014 */
1015 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1016 login->current_stage =
1017 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1018 >> 2;
1019 login->version_min = login_req->min_version;
1020 login->version_max = login_req->max_version;
1021 memcpy(login->isid, login_req->isid, 6);
1022 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1023 login->init_task_tag = login_req->itt;
1024 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1025 login->cid = be16_to_cpu(login_req->cid);
1026 login->tsih = be16_to_cpu(login_req->tsih);
1027 }
1028
1029 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1030
1031 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1032 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1033 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1034 memcpy(login->req_buf, &rx_desc->data[0], size);
1035
6faaa85f
NB		 1036 if (login->first_request) {
1037 complete(&isert_conn->conn_login_comp);
1038 return;
1039 }
1040 schedule_delayed_work(&conn->login_work, 0);
b8d26b3b
NB		 1041}
1042
b8d26b3b 1043static struct iscsi_cmd
676687c6 1044*isert_allocate_cmd(struct iscsi_conn *conn)
b8d26b3b
NB		 1045{
1046 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1047 struct isert_cmd *isert_cmd;
d703ce2f 1048 struct iscsi_cmd *cmd;
b8d26b3b 1049
676687c6 1050 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
d703ce2f
NB		 1051 if (!cmd) {
1052 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
b8d26b3b
NB		 1053 return NULL;
1054 }
d703ce2f 1055 isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b 1056 isert_cmd->conn = isert_conn;
d703ce2f 1057 isert_cmd->iscsi_cmd = cmd;
b8d26b3b 1058
d703ce2f 1059 return cmd;
b8d26b3b
NB		 1060}
1061
1062static int
1063isert_handle_scsi_cmd(struct isert_conn *isert_conn,
d703ce2f
NB		 1064 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1065 struct iser_rx_desc *rx_desc, unsigned char *buf)
b8d26b3b 1066{
b8d26b3b
NB		 1067 struct iscsi_conn *conn = isert_conn->conn;
1068 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1069 struct scatterlist *sg;
1070 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1071 bool dump_payload = false;
1072
1073 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1074 if (rc < 0)
1075 return rc;
1076
1077 imm_data = cmd->immediate_data;
1078 imm_data_len = cmd->first_burst_len;
1079 unsol_data = cmd->unsolicited_data;
1080
1081 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1082 if (rc < 0) {
1083 return 0;
1084 } else if (rc > 0) {
1085 dump_payload = true;
1086 goto sequence_cmd;
1087 }
1088
1089 if (!imm_data)
1090 return 0;
1091
1092 sg = &cmd->se_cmd.t_data_sg[0];
1093 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1094
1095 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1096 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1097
1098 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1099
1100 cmd->write_data_done += imm_data_len;
1101
1102 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1103 spin_lock_bh(&cmd->istate_lock);
1104 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1105 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1106 spin_unlock_bh(&cmd->istate_lock);
1107 }
1108
1109sequence_cmd:
561bf158 1110 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
b8d26b3b
NB		 1111
1112 if (!rc && dump_payload == false && unsol_data)
1113 iscsit_set_unsoliticed_dataout(cmd);
1114
b8d26b3b
NB		 1115 return 0;
1116}
1117
1118static int
1119isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1120 struct iser_rx_desc *rx_desc, unsigned char *buf)
1121{
1122 struct scatterlist *sg_start;
1123 struct iscsi_conn *conn = isert_conn->conn;
1124 struct iscsi_cmd *cmd = NULL;
1125 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1126 u32 unsol_data_len = ntoh24(hdr->dlength);
1127 int rc, sg_nents, sg_off, page_off;
1128
1129 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1130 if (rc < 0)
1131 return rc;
1132 else if (!cmd)
1133 return 0;
1134 /*
1135 * FIXME: Unexpected unsolicited_data out
1136 */
1137 if (!cmd->unsolicited_data) {
1138 pr_err("Received unexpected solicited data payload\n");
1139 dump_stack();
1140 return -1;
1141 }
1142
1143 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1144 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1145
1146 sg_off = cmd->write_data_done / PAGE_SIZE;
1147 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149 page_off = cmd->write_data_done % PAGE_SIZE;
1150 /*
1151 * FIXME: Non page-aligned unsolicited_data out
1152 */
1153 if (page_off) {
1154 pr_err("Received unexpected non-page aligned data payload\n");
1155 dump_stack();
1156 return -1;
1157 }
1158 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1159 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1160
1161 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1162 unsol_data_len);
1163
1164 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1165 if (rc < 0)
1166 return rc;
1167
1168 return 0;
1169}
1170
778de368
NB		 1171static int
1172isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
d703ce2f
NB		 1173 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1174 unsigned char *buf)
778de368 1175{
778de368
NB		 1176 struct iscsi_conn *conn = isert_conn->conn;
1177 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1178 int rc;
1179
1180 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1181 if (rc < 0)
1182 return rc;
1183 /*
1184 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1185 */
1186
1187 return iscsit_process_nop_out(conn, cmd, hdr);
1188}
1189
adb54c29
NB		 1190static int
1191isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
d703ce2f
NB		 1192 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1193 struct iscsi_text *hdr)
adb54c29 1194{
adb54c29
NB		 1195 struct iscsi_conn *conn = isert_conn->conn;
1196 u32 payload_length = ntoh24(hdr->dlength);
1197 int rc;
1198 unsigned char *text_in;
1199
1200 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1201 if (rc < 0)
1202 return rc;
1203
1204 text_in = kzalloc(payload_length, GFP_KERNEL);
1205 if (!text_in) {
1206 pr_err("Unable to allocate text_in of payload_length: %u\n",
1207 payload_length);
1208 return -ENOMEM;
1209 }
1210 cmd->text_in_ptr = text_in;
1211
1212 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1213
1214 return iscsit_process_text_cmd(conn, cmd, hdr);
1215}
1216
b8d26b3b
NB		 1217static int
1218isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1219 uint32_t read_stag, uint64_t read_va,
1220 uint32_t write_stag, uint64_t write_va)
1221{
1222 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1223 struct iscsi_conn *conn = isert_conn->conn;
ca40d24e 1224 struct iscsi_session *sess = conn->sess;
b8d26b3b
NB		 1225 struct iscsi_cmd *cmd;
1226 struct isert_cmd *isert_cmd;
1227 int ret = -EINVAL;
1228 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1229
ca40d24e
NB		 1230 if (sess->sess_ops->SessionType &&
1231 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1232 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1233 " ignoring\n", opcode);
1234 return 0;
1235 }
1236
b8d26b3b
NB		 1237 switch (opcode) {
1238 case ISCSI_OP_SCSI_CMD:
676687c6 1239 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1240 if (!cmd)
1241 break;
1242
d703ce2f 1243 isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1244 isert_cmd->read_stag = read_stag;
1245 isert_cmd->read_va = read_va;
1246 isert_cmd->write_stag = write_stag;
1247 isert_cmd->write_va = write_va;
1248
d703ce2f 1249 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
b8d26b3b
NB		 1250 rx_desc, (unsigned char *)hdr);
1251 break;
1252 case ISCSI_OP_NOOP_OUT:
676687c6 1253 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1254 if (!cmd)
1255 break;
1256
d703ce2f
NB		 1257 isert_cmd = iscsit_priv_cmd(cmd);
1258 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
778de368 1259 rx_desc, (unsigned char *)hdr);
b8d26b3b
NB		 1260 break;
1261 case ISCSI_OP_SCSI_DATA_OUT:
1262 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1263 (unsigned char *)hdr);
1264 break;
1265 case ISCSI_OP_SCSI_TMFUNC:
676687c6 1266 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1267 if (!cmd)
1268 break;
1269
1270 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1271 (unsigned char *)hdr);
1272 break;
1273 case ISCSI_OP_LOGOUT:
676687c6 1274 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1275 if (!cmd)
1276 break;
1277
1278 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1279 if (ret > 0)
1280 wait_for_completion_timeout(&conn->conn_logout_comp,
1281 SECONDS_FOR_LOGOUT_COMP *
1282 HZ);
1283 break;
adb54c29 1284 case ISCSI_OP_TEXT:
676687c6 1285 cmd = isert_allocate_cmd(conn);
adb54c29
NB		 1286 if (!cmd)
1287 break;
1288
d703ce2f
NB		 1289 isert_cmd = iscsit_priv_cmd(cmd);
1290 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
adb54c29
NB		 1291 rx_desc, (struct iscsi_text *)hdr);
1292 break;
b8d26b3b
NB		 1293 default:
1294 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1295 dump_stack();
1296 break;
1297 }
1298
1299 return ret;
1300}
1301
1302static void
1303isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1304{
1305 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1306 uint64_t read_va = 0, write_va = 0;
1307 uint32_t read_stag = 0, write_stag = 0;
1308 int rc;
1309
1310 switch (iser_hdr->flags & 0xF0) {
1311 case ISCSI_CTRL:
1312 if (iser_hdr->flags & ISER_RSV) {
1313 read_stag = be32_to_cpu(iser_hdr->read_stag);
1314 read_va = be64_to_cpu(iser_hdr->read_va);
1315 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1316 read_stag, (unsigned long long)read_va);
1317 }
1318 if (iser_hdr->flags & ISER_WSV) {
1319 write_stag = be32_to_cpu(iser_hdr->write_stag);
1320 write_va = be64_to_cpu(iser_hdr->write_va);
1321 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1322 write_stag, (unsigned long long)write_va);
1323 }
1324
1325 pr_debug("ISER ISCSI_CTRL PDU\n");
1326 break;
1327 case ISER_HELLO:
1328 pr_err("iSER Hello message\n");
1329 break;
1330 default:
1331 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1332 break;
1333 }
1334
1335 rc = isert_rx_opcode(isert_conn, rx_desc,
1336 read_stag, read_va, write_stag, write_va);
1337}
1338
1339static void
1340isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1341 unsigned long xfer_len)
1342{
1343 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1344 struct iscsi_hdr *hdr;
1345 u64 rx_dma;
1346 int rx_buflen, outstanding;
1347
1348 if ((char *)desc == isert_conn->login_req_buf) {
1349 rx_dma = isert_conn->login_req_dma;
1350 rx_buflen = ISER_RX_LOGIN_SIZE;
1351 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1352 rx_dma, rx_buflen);
1353 } else {
1354 rx_dma = desc->dma_addr;
1355 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1356 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1357 rx_dma, rx_buflen);
1358 }
1359
1360 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1361
1362 hdr = &desc->iscsi_header;
1363 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1364 hdr->opcode, hdr->itt, hdr->flags,
1365 (int)(xfer_len - ISER_HEADERS_LEN));
1366
1367 if ((char *)desc == isert_conn->login_req_buf)
1368 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1369 isert_conn);
1370 else
1371 isert_rx_do_work(desc, isert_conn);
1372
1373 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1374 DMA_FROM_DEVICE);
1375
1376 isert_conn->post_recv_buf_count--;
1377 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1378 isert_conn->post_recv_buf_count);
1379
1380 if ((char *)desc == isert_conn->login_req_buf)
1381 return;
1382
1383 outstanding = isert_conn->post_recv_buf_count;
1384 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1385 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1386 ISERT_MIN_POSTED_RX);
1387 err = isert_post_recv(isert_conn, count);
1388 if (err) {
1389 pr_err("isert_post_recv() count: %d failed, %d\n",
1390 count, err);
1391 }
1392 }
1393}
1394
1395static void
1396isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1397{
1398 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1399 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1400
90ecc6e2 1401 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
b8d26b3b 1402 if (wr->sge) {
90ecc6e2
VP		 1403 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
1404 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1405 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1406 DMA_TO_DEVICE : DMA_FROM_DEVICE);
b8d26b3b
NB		 1407 wr->sge = NULL;
1408 }
1409
90ecc6e2
VP		 1410 if (wr->send_wr) {
1411 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1412 kfree(wr->send_wr);
1413 wr->send_wr = NULL;
1414 }
b8d26b3b 1415
90ecc6e2
VP		 1416 if (wr->ib_sge) {
1417 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1418 kfree(wr->ib_sge);
1419 wr->ib_sge = NULL;
1420 }
b8d26b3b
NB		 1421}
1422
59464ef4 1423static void
a3a5a826 1424isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
59464ef4
VP		 1425{
1426 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
1427 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1428 LIST_HEAD(unmap_list);
1429
a3a5a826 1430 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
59464ef4
VP		 1431
1432 if (wr->fr_desc) {
a3a5a826 1433 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
59464ef4
VP		 1434 isert_cmd, wr->fr_desc);
1435 spin_lock_bh(&isert_conn->conn_lock);
a3a5a826 1436 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
59464ef4
VP		 1437 spin_unlock_bh(&isert_conn->conn_lock);
1438 wr->fr_desc = NULL;
1439 }
1440
1441 if (wr->sge) {
a3a5a826 1442 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
59464ef4
VP		 1443 ib_dma_unmap_sg(ib_dev, wr->sge, wr->num_sge,
1444 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
1445 DMA_TO_DEVICE : DMA_FROM_DEVICE);
1446 wr->sge = NULL;
1447 }
1448
1449 wr->ib_sge = NULL;
1450 wr->send_wr = NULL;
1451}
1452
b8d26b3b
NB		 1453static void
1454isert_put_cmd(struct isert_cmd *isert_cmd)
1455{
d703ce2f 1456 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b 1457 struct isert_conn *isert_conn = isert_cmd->conn;
186a9647 1458 struct iscsi_conn *conn = isert_conn->conn;
d40945d8 1459 struct isert_device *device = isert_conn->conn_device;
b8d26b3b
NB		 1460
1461 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1462
1463 switch (cmd->iscsi_opcode) {
1464 case ISCSI_OP_SCSI_CMD:
b8d26b3b
NB		 1465 spin_lock_bh(&conn->cmd_lock);
1466 if (!list_empty(&cmd->i_conn_node))
5159d763 1467 list_del_init(&cmd->i_conn_node);
b8d26b3b
NB		 1468 spin_unlock_bh(&conn->cmd_lock);
1469
1470 if (cmd->data_direction == DMA_TO_DEVICE)
1471 iscsit_stop_dataout_timer(cmd);
1472
d40945d8 1473 device->unreg_rdma_mem(isert_cmd, isert_conn);
186a9647
NB		 1474 transport_generic_free_cmd(&cmd->se_cmd, 0);
1475 break;
b8d26b3b 1476 case ISCSI_OP_SCSI_TMFUNC:
186a9647
NB		 1477 spin_lock_bh(&conn->cmd_lock);
1478 if (!list_empty(&cmd->i_conn_node))
5159d763 1479 list_del_init(&cmd->i_conn_node);
186a9647
NB		 1480 spin_unlock_bh(&conn->cmd_lock);
1481
b8d26b3b
NB		 1482 transport_generic_free_cmd(&cmd->se_cmd, 0);
1483 break;
1484 case ISCSI_OP_REJECT:
1485 case ISCSI_OP_NOOP_OUT:
adb54c29 1486 case ISCSI_OP_TEXT:
b8d26b3b
NB		 1487 spin_lock_bh(&conn->cmd_lock);
1488 if (!list_empty(&cmd->i_conn_node))
5159d763 1489 list_del_init(&cmd->i_conn_node);
b8d26b3b
NB		 1490 spin_unlock_bh(&conn->cmd_lock);
1491
1492 /*
1493 * Handle special case for REJECT when iscsi_add_reject*() has
1494 * overwritten the original iscsi_opcode assignment, and the
1495 * associated cmd->se_cmd needs to be released.
1496 */
1497 if (cmd->se_cmd.se_tfo != NULL) {
3df8f68a
NB		 1498 pr_debug("Calling transport_generic_free_cmd from"
1499 " isert_put_cmd for 0x%02x\n",
1500 cmd->iscsi_opcode);
b8d26b3b
NB		 1501 transport_generic_free_cmd(&cmd->se_cmd, 0);
1502 break;
1503 }
1504 /*
1505 * Fall-through
1506 */
1507 default:
d703ce2f 1508 iscsit_release_cmd(cmd);
b8d26b3b
NB		 1509 break;
1510 }
1511}
1512
1513static void
1514isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1515{
1516 if (tx_desc->dma_addr != 0) {
1517 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1518 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1519 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1520 tx_desc->dma_addr = 0;
1521 }
1522}
1523
1524static void
1525isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1526 struct ib_device *ib_dev)
1527{
dbbc5d11
NB		 1528 if (isert_cmd->pdu_buf_dma != 0) {
1529 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1530 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1531 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1532 isert_cmd->pdu_buf_dma = 0;
b8d26b3b
NB		 1533 }
1534
1535 isert_unmap_tx_desc(tx_desc, ib_dev);
1536 isert_put_cmd(isert_cmd);
1537}
1538
1539static void
1540isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1541 struct isert_cmd *isert_cmd)
1542{
1543 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
d703ce2f 1544 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b 1545 struct se_cmd *se_cmd = &cmd->se_cmd;
90ecc6e2 1546 struct isert_conn *isert_conn = isert_cmd->conn;
d40945d8 1547 struct isert_device *device = isert_conn->conn_device;
b8d26b3b
NB		 1548
1549 iscsit_stop_dataout_timer(cmd);
d40945d8 1550 device->unreg_rdma_mem(isert_cmd, isert_conn);
90ecc6e2 1551 cmd->write_data_done = wr->cur_rdma_length;
b6b87a1d 1552 wr->send_wr_num = 0;
b8d26b3b 1553
90ecc6e2 1554 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
b8d26b3b
NB		 1555 spin_lock_bh(&cmd->istate_lock);
1556 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1557 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1558 spin_unlock_bh(&cmd->istate_lock);
1559
1560 target_execute_cmd(se_cmd);
1561}
1562
1563static void
1564isert_do_control_comp(struct work_struct *work)
1565{
1566 struct isert_cmd *isert_cmd = container_of(work,
1567 struct isert_cmd, comp_work);
1568 struct isert_conn *isert_conn = isert_cmd->conn;
1569 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
d703ce2f 1570 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b
NB		 1571
1572 switch (cmd->i_state) {
1573 case ISTATE_SEND_TASKMGTRSP:
1574 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1575
1576 atomic_dec(&isert_conn->post_send_buf_count);
1577 iscsit_tmr_post_handler(cmd, cmd->conn);
1578
1579 cmd->i_state = ISTATE_SENT_STATUS;
1580 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1581 break;
1582 case ISTATE_SEND_REJECT:
1583 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1584 atomic_dec(&isert_conn->post_send_buf_count);
1585
1586 cmd->i_state = ISTATE_SENT_STATUS;
b8d26b3b 1587 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
3df8f68a 1588 break;
b8d26b3b
NB		 1589 case ISTATE_SEND_LOGOUTRSP:
1590 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
1591 /*
1592 * Call atomic_dec(&isert_conn->post_send_buf_count)
defd8848 1593 * from isert_wait_conn()
b8d26b3b
NB		 1594 */
1595 isert_conn->logout_posted = true;
1596 iscsit_logout_post_handler(cmd, cmd->conn);
1597 break;
adb54c29
NB		 1598 case ISTATE_SEND_TEXTRSP:
1599 atomic_dec(&isert_conn->post_send_buf_count);
1600 cmd->i_state = ISTATE_SENT_STATUS;
1601 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev);
1602 break;
b8d26b3b
NB		 1603 default:
1604 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1605 dump_stack();
1606 break;
1607 }
1608}
1609
1610static void
1611isert_response_completion(struct iser_tx_desc *tx_desc,
1612 struct isert_cmd *isert_cmd,
1613 struct isert_conn *isert_conn,
1614 struct ib_device *ib_dev)
1615{
d703ce2f 1616 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b6b87a1d 1617 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
b8d26b3b
NB		 1618
1619 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
3df8f68a 1620 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
adb54c29
NB		 1621 cmd->i_state == ISTATE_SEND_REJECT ||
1622 cmd->i_state == ISTATE_SEND_TEXTRSP) {
b8d26b3b
NB		 1623 isert_unmap_tx_desc(tx_desc, ib_dev);
1624
1625 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1626 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1627 return;
1628 }
b6b87a1d 1629 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 1630
1631 cmd->i_state = ISTATE_SENT_STATUS;
1632 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1633}
1634
1635static void
95b60f07
NB		 1636__isert_send_completion(struct iser_tx_desc *tx_desc,
1637 struct isert_conn *isert_conn)
b8d26b3b
NB		 1638{
1639 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1640 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1641 struct isert_rdma_wr *wr;
1642
1643 if (!isert_cmd) {
1644 atomic_dec(&isert_conn->post_send_buf_count);
1645 isert_unmap_tx_desc(tx_desc, ib_dev);
1646 return;
1647 }
1648 wr = &isert_cmd->rdma_wr;
1649
1650 switch (wr->iser_ib_op) {
1651 case ISER_IB_RECV:
1652 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1653 dump_stack();
1654 break;
1655 case ISER_IB_SEND:
1656 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1657 isert_response_completion(tx_desc, isert_cmd,
1658 isert_conn, ib_dev);
1659 break;
1660 case ISER_IB_RDMA_WRITE:
1661 pr_err("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
1662 dump_stack();
1663 break;
1664 case ISER_IB_RDMA_READ:
1665 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1666
b6b87a1d 1667 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 1668 isert_completion_rdma_read(tx_desc, isert_cmd);
1669 break;
1670 default:
1671 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1672 dump_stack();
1673 break;
1674 }
1675}
1676
95b60f07
NB		 1677static void
1678isert_send_completion(struct iser_tx_desc *tx_desc,
1679 struct isert_conn *isert_conn)
1680{
1681 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1682 struct iser_tx_desc *t;
1683 /*
1684 * Drain coalesced completion llist starting from comp_llnode_batch
1685 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1686 */
1687 while (llnode) {
1688 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1689 llnode = llist_next(llnode);
1690 __isert_send_completion(t, isert_conn);
1691 }
1692 __isert_send_completion(tx_desc, isert_conn);
1693}
1694
ebbe4421
NB		 1695static void
1696isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1697{
1698 struct llist_node *llnode;
1699 struct isert_rdma_wr *wr;
1700 struct iser_tx_desc *t;
1701
1702 mutex_lock(&isert_conn->conn_mutex);
1703 llnode = llist_del_all(&isert_conn->conn_comp_llist);
1704 isert_conn->conn_comp_batch = 0;
1705 mutex_unlock(&isert_conn->conn_mutex);
1706
1707 while (llnode) {
1708 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1709 llnode = llist_next(llnode);
1710 wr = &t->isert_cmd->rdma_wr;
1711
1712 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1713 isert_completion_put(t, t->isert_cmd, ib_dev);
1714 }
1715}
1716
b8d26b3b 1717static void
defd8848 1718isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
b8d26b3b
NB		 1719{
1720 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
defd8848 1721 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
ebbe4421
NB		 1722 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1723 struct isert_rdma_wr *wr;
1724 struct iser_tx_desc *t;
1725
1726 while (llnode) {
1727 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1728 llnode = llist_next(llnode);
1729 wr = &t->isert_cmd->rdma_wr;
1730
1731 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
1732 isert_completion_put(t, t->isert_cmd, ib_dev);
1733 }
1734 tx_desc->comp_llnode_batch = NULL;
defd8848
NB		 1735
1736 if (!isert_cmd)
1737 isert_unmap_tx_desc(tx_desc, ib_dev);
1738 else
1739 isert_completion_put(tx_desc, isert_cmd, ib_dev);
1740}
1741
1742static void
1743isert_cq_rx_comp_err(struct isert_conn *isert_conn)
1744{
1745 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1746 struct iscsi_conn *conn = isert_conn->conn;
b8d26b3b 1747
defd8848
NB		 1748 if (isert_conn->post_recv_buf_count)
1749 return;
b8d26b3b 1750
ebbe4421
NB		 1751 isert_cq_drain_comp_llist(isert_conn, ib_dev);
1752
defd8848
NB		 1753 if (conn->sess) {
1754 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
1755 target_wait_for_sess_cmds(conn->sess->se_sess);
b8d26b3b
NB		 1756 }
1757
defd8848
NB		 1758 while (atomic_read(&isert_conn->post_send_buf_count))
1759 msleep(3000);
b8d26b3b 1760
defd8848
NB		 1761 mutex_lock(&isert_conn->conn_mutex);
1762 isert_conn->state = ISER_CONN_DOWN;
1763 mutex_unlock(&isert_conn->conn_mutex);
b2cb9649 1764
defd8848 1765 complete(&isert_conn->conn_wait_comp_err);
b8d26b3b
NB		 1766}
1767
1768static void
1769isert_cq_tx_work(struct work_struct *work)
1770{
1771 struct isert_cq_desc *cq_desc = container_of(work,
1772 struct isert_cq_desc, cq_tx_work);
1773 struct isert_device *device = cq_desc->device;
1774 int cq_index = cq_desc->cq_index;
1775 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
1776 struct isert_conn *isert_conn;
1777 struct iser_tx_desc *tx_desc;
1778 struct ib_wc wc;
1779
1780 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
1781 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
1782 isert_conn = wc.qp->qp_context;
1783
1784 if (wc.status == IB_WC_SUCCESS) {
1785 isert_send_completion(tx_desc, isert_conn);
1786 } else {
1787 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
1788 pr_debug("TX wc.status: 0x%08x\n", wc.status);
c5a2adbf 1789 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
defd8848 1790
9bb4ca68 1791 if (wc.wr_id != ISER_FASTREG_LI_WRID) {
ebbe4421
NB		 1792 if (tx_desc->llnode_active)
1793 continue;
1794
9bb4ca68
NB		 1795 atomic_dec(&isert_conn->post_send_buf_count);
1796 isert_cq_tx_comp_err(tx_desc, isert_conn);
1797 }
b8d26b3b
NB		 1798 }
1799 }
1800
1801 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
1802}
1803
1804static void
1805isert_cq_tx_callback(struct ib_cq *cq, void *context)
1806{
1807 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1808
b8d26b3b
NB		 1809 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
1810}
1811
1812static void
1813isert_cq_rx_work(struct work_struct *work)
1814{
1815 struct isert_cq_desc *cq_desc = container_of(work,
1816 struct isert_cq_desc, cq_rx_work);
1817 struct isert_device *device = cq_desc->device;
1818 int cq_index = cq_desc->cq_index;
1819 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
1820 struct isert_conn *isert_conn;
1821 struct iser_rx_desc *rx_desc;
1822 struct ib_wc wc;
1823 unsigned long xfer_len;
1824
1825 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
1826 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
1827 isert_conn = wc.qp->qp_context;
1828
1829 if (wc.status == IB_WC_SUCCESS) {
1830 xfer_len = (unsigned long)wc.byte_len;
1831 isert_rx_completion(rx_desc, isert_conn, xfer_len);
1832 } else {
1833 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
c5a2adbf 1834 if (wc.status != IB_WC_WR_FLUSH_ERR) {
b8d26b3b 1835 pr_debug("RX wc.status: 0x%08x\n", wc.status);
c5a2adbf
NB		 1836 pr_debug("RX wc.vendor_err: 0x%08x\n",
1837 wc.vendor_err);
1838 }
b8d26b3b 1839 isert_conn->post_recv_buf_count--;
defd8848 1840 isert_cq_rx_comp_err(isert_conn);
b8d26b3b
NB		 1841 }
1842 }
1843
1844 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
1845}
1846
1847static void
1848isert_cq_rx_callback(struct ib_cq *cq, void *context)
1849{
1850 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
1851
b8d26b3b
NB		 1852 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
1853}
1854
1855static int
1856isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1857{
1858 struct ib_send_wr *wr_failed;
1859 int ret;
1860
1861 atomic_inc(&isert_conn->post_send_buf_count);
1862
1863 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
1864 &wr_failed);
1865 if (ret) {
1866 pr_err("ib_post_send failed with %d\n", ret);
1867 atomic_dec(&isert_conn->post_send_buf_count);
1868 return ret;
1869 }
1870 return ret;
1871}
1872
1873static int
1874isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1875{
d703ce2f 1876 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1877 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1878 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1879 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1880 &isert_cmd->tx_desc.iscsi_header;
1881
1882 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1883 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1884 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1885 /*
1886 * Attach SENSE DATA payload to iSCSI Response PDU
1887 */
1888 if (cmd->se_cmd.sense_buffer &&
1889 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1890 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1891 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1892 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
dbbc5d11 1893 u32 padding, pdu_len;
b8d26b3b
NB		 1894
1895 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1896 cmd->sense_buffer);
1897 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1898
1899 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1900 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
dbbc5d11 1901 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
b8d26b3b 1902
dbbc5d11
NB		 1903 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1904 (void *)cmd->sense_buffer, pdu_len,
b8d26b3b
NB		 1905 DMA_TO_DEVICE);
1906
dbbc5d11
NB		 1907 isert_cmd->pdu_buf_len = pdu_len;
1908 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1909 tx_dsg->length = pdu_len;
b8d26b3b
NB		 1910 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1911 isert_cmd->tx_desc.num_sge = 2;
1912 }
1913
95b60f07 1914 isert_init_send_wr(isert_conn, isert_cmd, send_wr, true);
b8d26b3b
NB		 1915
1916 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1917
1918 return isert_post_response(isert_conn, isert_cmd);
1919}
1920
1921static int
1922isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1923 bool nopout_response)
1924{
d703ce2f 1925 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1926 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1927 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1928
1929 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1930 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1931 &isert_cmd->tx_desc.iscsi_header,
1932 nopout_response);
1933 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 1934 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b 1935
8b513d0c 1936 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
b8d26b3b
NB		 1937
1938 return isert_post_response(isert_conn, isert_cmd);
1939}
1940
1941static int
1942isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1943{
d703ce2f 1944 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1945 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1946 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1947
1948 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1949 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1950 &isert_cmd->tx_desc.iscsi_header);
1951 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 1952 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 1953
1954 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1955
1956 return isert_post_response(isert_conn, isert_cmd);
1957}
1958
1959static int
1960isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1961{
d703ce2f 1962 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1963 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1964 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1965
1966 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1967 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1968 &isert_cmd->tx_desc.iscsi_header);
1969 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 1970 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 1971
1972 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
1973
1974 return isert_post_response(isert_conn, isert_cmd);
1975}
1976
1977static int
1978isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1979{
d703ce2f 1980 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1981 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1982 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
3df8f68a
NB		 1983 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1984 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1985 struct iscsi_reject *hdr =
1986 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
b8d26b3b
NB		 1987
1988 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
3df8f68a 1989 iscsit_build_reject(cmd, conn, hdr);
b8d26b3b 1990 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
3df8f68a
NB		 1991
1992 hton24(hdr->dlength, ISCSI_HDR_LEN);
dbbc5d11 1993 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
3df8f68a
NB		 1994 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1995 DMA_TO_DEVICE);
dbbc5d11
NB		 1996 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1997 tx_dsg->addr = isert_cmd->pdu_buf_dma;
3df8f68a
NB		 1998 tx_dsg->length = ISCSI_HDR_LEN;
1999 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2000 isert_cmd->tx_desc.num_sge = 2;
2001
95b60f07 2002 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 2003
2004 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2005
2006 return isert_post_response(isert_conn, isert_cmd);
2007}
2008
adb54c29
NB		 2009static int
2010isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2011{
d703ce2f 2012 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
adb54c29
NB		 2013 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2014 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2015 struct iscsi_text_rsp *hdr =
2016 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2017 u32 txt_rsp_len;
2018 int rc;
2019
2020 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2021 rc = iscsit_build_text_rsp(cmd, conn, hdr);
2022 if (rc < 0)
2023 return rc;
2024
2025 txt_rsp_len = rc;
2026 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2027
2028 if (txt_rsp_len) {
2029 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2030 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2031 void *txt_rsp_buf = cmd->buf_ptr;
2032
2033 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2034 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2035
2036 isert_cmd->pdu_buf_len = txt_rsp_len;
2037 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2038 tx_dsg->length = txt_rsp_len;
2039 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2040 isert_cmd->tx_desc.num_sge = 2;
2041 }
95b60f07 2042 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
adb54c29
NB		 2043
2044 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2045
2046 return isert_post_response(isert_conn, isert_cmd);
2047}
2048
b8d26b3b
NB		 2049static int
2050isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2051 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2052 u32 data_left, u32 offset)
2053{
d703ce2f 2054 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b
NB		 2055 struct scatterlist *sg_start, *tmp_sg;
2056 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2057 u32 sg_off, page_off;
2058 int i = 0, sg_nents;
2059
2060 sg_off = offset / PAGE_SIZE;
2061 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2062 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2063 page_off = offset % PAGE_SIZE;
2064
2065 send_wr->sg_list = ib_sge;
2066 send_wr->num_sge = sg_nents;
2067 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2068 /*
2069 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2070 */
2071 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2072 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2073 (unsigned long long)tmp_sg->dma_address,
2074 tmp_sg->length, page_off);
2075
2076 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2077 ib_sge->length = min_t(u32, data_left,
2078 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2079 ib_sge->lkey = isert_conn->conn_mr->lkey;
2080
90ecc6e2
VP		 2081 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2082 ib_sge->addr, ib_sge->length, ib_sge->lkey);
b8d26b3b
NB		 2083 page_off = 0;
2084 data_left -= ib_sge->length;
2085 ib_sge++;
2086 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2087 }
2088
2089 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2090 send_wr->sg_list, send_wr->num_sge);
2091
2092 return sg_nents;
2093}
2094
2095static int
90ecc6e2
VP		 2096isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2097 struct isert_rdma_wr *wr)
b8d26b3b
NB		 2098{
2099 struct se_cmd *se_cmd = &cmd->se_cmd;
d703ce2f 2100 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b 2101 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
b8d26b3b 2102 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
90ecc6e2 2103 struct ib_send_wr *send_wr;
b8d26b3b 2104 struct ib_sge *ib_sge;
90ecc6e2
VP		 2105 struct scatterlist *sg_start;
2106 u32 sg_off = 0, sg_nents;
2107 u32 offset = 0, data_len, data_left, rdma_write_max, va_offset = 0;
2108 int ret = 0, count, i, ib_sge_cnt;
2109
2110 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2111 data_left = se_cmd->data_length;
90ecc6e2
VP		 2112 } else {
2113 sg_off = cmd->write_data_done / PAGE_SIZE;
2114 data_left = se_cmd->data_length - cmd->write_data_done;
2115 offset = cmd->write_data_done;
2116 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2117 }
b8d26b3b 2118
90ecc6e2
VP		 2119 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2120 sg_nents = se_cmd->t_data_nents - sg_off;
b8d26b3b 2121
90ecc6e2
VP		 2122 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2123 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2124 DMA_TO_DEVICE : DMA_FROM_DEVICE);
b8d26b3b 2125 if (unlikely(!count)) {
90ecc6e2 2126 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
b8d26b3b
NB		 2127 return -EINVAL;
2128 }
90ecc6e2 2129 wr->sge = sg_start;
b8d26b3b 2130 wr->num_sge = sg_nents;
90ecc6e2
VP		 2131 wr->cur_rdma_length = data_left;
2132 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2133 isert_cmd, count, sg_start, sg_nents, data_left);
b8d26b3b
NB		 2134
2135 ib_sge = kzalloc(sizeof(struct ib_sge) * sg_nents, GFP_KERNEL);
2136 if (!ib_sge) {
90ecc6e2 2137 pr_warn("Unable to allocate ib_sge\n");
b8d26b3b
NB		 2138 ret = -ENOMEM;
2139 goto unmap_sg;
2140 }
90ecc6e2 2141 wr->ib_sge = ib_sge;
b8d26b3b
NB		 2142
2143 wr->send_wr_num = DIV_ROUND_UP(sg_nents, isert_conn->max_sge);
2144 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2145 GFP_KERNEL);
2146 if (!wr->send_wr) {
90ecc6e2 2147 pr_debug("Unable to allocate wr->send_wr\n");
b8d26b3b
NB		 2148 ret = -ENOMEM;
2149 goto unmap_sg;
2150 }
b8d26b3b
NB		 2151
2152 wr->isert_cmd = isert_cmd;
2153 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
b8d26b3b
NB		 2154
2155 for (i = 0; i < wr->send_wr_num; i++) {
2156 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2157 data_len = min(data_left, rdma_write_max);
2158
b8d26b3b 2159 send_wr->send_flags = 0;
90ecc6e2
VP		 2160 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2161 send_wr->opcode = IB_WR_RDMA_WRITE;
2162 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2163 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2164 if (i + 1 == wr->send_wr_num)
2165 send_wr->next = &isert_cmd->tx_desc.send_wr;
2166 else
2167 send_wr->next = &wr->send_wr[i + 1];
2168 } else {
2169 send_wr->opcode = IB_WR_RDMA_READ;
2170 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2171 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2172 if (i + 1 == wr->send_wr_num)
2173 send_wr->send_flags = IB_SEND_SIGNALED;
2174 else
2175 send_wr->next = &wr->send_wr[i + 1];
2176 }
b8d26b3b
NB		 2177
2178 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2179 send_wr, data_len, offset);
2180 ib_sge += ib_sge_cnt;
2181
b8d26b3b 2182 offset += data_len;
90ecc6e2 2183 va_offset += data_len;
b8d26b3b
NB		 2184 data_left -= data_len;
2185 }
90ecc6e2
VP		 2186
2187 return 0;
2188unmap_sg:
2189 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2190 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2191 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2192 return ret;
2193}
2194
59464ef4
VP		 2195static int
2196isert_map_fr_pagelist(struct ib_device *ib_dev,
2197 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2198{
2199 u64 start_addr, end_addr, page, chunk_start = 0;
2200 struct scatterlist *tmp_sg;
2201 int i = 0, new_chunk, last_ent, n_pages;
2202
2203 n_pages = 0;
2204 new_chunk = 1;
2205 last_ent = sg_nents - 1;
2206 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2207 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2208 if (new_chunk)
2209 chunk_start = start_addr;
2210 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2211
2212 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2213 i, (unsigned long long)tmp_sg->dma_address,
2214 tmp_sg->length);
2215
2216 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2217 new_chunk = 0;
2218 continue;
2219 }
2220 new_chunk = 1;
2221
2222 page = chunk_start & PAGE_MASK;
2223 do {
2224 fr_pl[n_pages++] = page;
2225 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2226 n_pages - 1, page);
2227 page += PAGE_SIZE;
2228 } while (page < end_addr);
2229 }
2230
2231 return n_pages;
2232}
2233
2234static int
2235isert_fast_reg_mr(struct fast_reg_descriptor *fr_desc,
9bd626e7
SG		 2236 struct isert_conn *isert_conn, struct scatterlist *sg_start,
2237 struct ib_sge *ib_sge, u32 sg_nents, u32 offset,
2238 unsigned int data_len)
59464ef4 2239{
59464ef4 2240 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
59464ef4
VP		 2241 struct ib_send_wr fr_wr, inv_wr;
2242 struct ib_send_wr *bad_wr, *wr = NULL;
9bd626e7
SG		 2243 int ret, pagelist_len;
2244 u32 page_off;
59464ef4 2245 u8 key;
59464ef4 2246
9bd626e7 2247 sg_nents = min_t(unsigned int, sg_nents, ISCSI_ISER_SG_TABLESIZE);
59464ef4
VP		 2248 page_off = offset % PAGE_SIZE;
2249
9bd626e7
SG		 2250 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
2251 fr_desc, sg_nents, offset);
59464ef4
VP		 2252
2253 pagelist_len = isert_map_fr_pagelist(ib_dev, sg_start, sg_nents,
2254 &fr_desc->data_frpl->page_list[0]);
2255
2256 if (!fr_desc->valid) {
2257 memset(&inv_wr, 0, sizeof(inv_wr));
9bb4ca68 2258 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
59464ef4
VP		 2259 inv_wr.opcode = IB_WR_LOCAL_INV;
2260 inv_wr.ex.invalidate_rkey = fr_desc->data_mr->rkey;
2261 wr = &inv_wr;
2262 /* Bump the key */
2263 key = (u8)(fr_desc->data_mr->rkey & 0x000000FF);
2264 ib_update_fast_reg_key(fr_desc->data_mr, ++key);
2265 }
2266
2267 /* Prepare FASTREG WR */
2268 memset(&fr_wr, 0, sizeof(fr_wr));
9bb4ca68 2269 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
59464ef4
VP		 2270 fr_wr.opcode = IB_WR_FAST_REG_MR;
2271 fr_wr.wr.fast_reg.iova_start =
2272 fr_desc->data_frpl->page_list[0] + page_off;
2273 fr_wr.wr.fast_reg.page_list = fr_desc->data_frpl;
2274 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2275 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
2276 fr_wr.wr.fast_reg.length = data_len;
2277 fr_wr.wr.fast_reg.rkey = fr_desc->data_mr->rkey;
2278 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2279
2280 if (!wr)
2281 wr = &fr_wr;
2282 else
2283 wr->next = &fr_wr;
2284
2285 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2286 if (ret) {
2287 pr_err("fast registration failed, ret:%d\n", ret);
2288 return ret;
2289 }
2290 fr_desc->valid = false;
2291
2292 ib_sge->lkey = fr_desc->data_mr->lkey;
2293 ib_sge->addr = fr_desc->data_frpl->page_list[0] + page_off;
2294 ib_sge->length = data_len;
2295
2296 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2297 ib_sge->addr, ib_sge->length, ib_sge->lkey);
2298
2299 return ret;
2300}
2301
2302static int
a3a5a826
SG		 2303isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2304 struct isert_rdma_wr *wr)
59464ef4
VP		 2305{
2306 struct se_cmd *se_cmd = &cmd->se_cmd;
2307 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2308 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2309 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2310 struct ib_send_wr *send_wr;
2311 struct ib_sge *ib_sge;
2312 struct scatterlist *sg_start;
2313 struct fast_reg_descriptor *fr_desc;
2314 u32 sg_off = 0, sg_nents;
2315 u32 offset = 0, data_len, data_left, rdma_write_max;
2316 int ret = 0, count;
2317 unsigned long flags;
2318
2319 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2320 data_left = se_cmd->data_length;
59464ef4 2321 } else {
59464ef4 2322 offset = cmd->write_data_done;
9bd626e7
SG		 2323 sg_off = offset / PAGE_SIZE;
2324 data_left = se_cmd->data_length - cmd->write_data_done;
59464ef4
VP		 2325 isert_cmd->tx_desc.isert_cmd = isert_cmd;
2326 }
2327
2328 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2329 sg_nents = se_cmd->t_data_nents - sg_off;
2330
2331 count = ib_dma_map_sg(ib_dev, sg_start, sg_nents,
2332 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2333 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2334 if (unlikely(!count)) {
2335 pr_err("Cmd: %p unrable to map SGs\n", isert_cmd);
2336 return -EINVAL;
2337 }
2338 wr->sge = sg_start;
2339 wr->num_sge = sg_nents;
2340 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
2341 isert_cmd, count, sg_start, sg_nents, data_left);
2342
2343 memset(&wr->s_ib_sge, 0, sizeof(*ib_sge));
2344 ib_sge = &wr->s_ib_sge;
2345 wr->ib_sge = ib_sge;
2346
2347 wr->send_wr_num = 1;
2348 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2349 wr->send_wr = &wr->s_send_wr;
2350
2351 wr->isert_cmd = isert_cmd;
2352 rdma_write_max = ISCSI_ISER_SG_TABLESIZE * PAGE_SIZE;
2353
2354 send_wr = &isert_cmd->rdma_wr.s_send_wr;
2355 send_wr->sg_list = ib_sge;
2356 send_wr->num_sge = 1;
2357 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2358 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2359 send_wr->opcode = IB_WR_RDMA_WRITE;
2360 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2361 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2362 send_wr->send_flags = 0;
2363 send_wr->next = &isert_cmd->tx_desc.send_wr;
2364 } else {
2365 send_wr->opcode = IB_WR_RDMA_READ;
2366 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2367 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2368 send_wr->send_flags = IB_SEND_SIGNALED;
2369 }
2370
2371 data_len = min(data_left, rdma_write_max);
2372 wr->cur_rdma_length = data_len;
2373
f01b9f73
VP		 2374 /* if there is a single dma entry, dma mr is sufficient */
2375 if (count == 1) {
2376 ib_sge->addr = ib_sg_dma_address(ib_dev, &sg_start[0]);
2377 ib_sge->length = ib_sg_dma_len(ib_dev, &sg_start[0]);
2378 ib_sge->lkey = isert_conn->conn_mr->lkey;
2379 wr->fr_desc = NULL;
2380 } else {
2381 spin_lock_irqsave(&isert_conn->conn_lock, flags);
a3a5a826 2382 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
f01b9f73
VP		 2383 struct fast_reg_descriptor, list);
2384 list_del(&fr_desc->list);
2385 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2386 wr->fr_desc = fr_desc;
59464ef4 2387
9bd626e7
SG		 2388 ret = isert_fast_reg_mr(fr_desc, isert_conn, sg_start,
2389 ib_sge, sg_nents, offset, data_len);
f01b9f73 2390 if (ret) {
a3a5a826 2391 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
f01b9f73
VP		 2392 goto unmap_sg;
2393 }
59464ef4
VP		 2394 }
2395
2396 return 0;
2397
2398unmap_sg:
2399 ib_dma_unmap_sg(ib_dev, sg_start, sg_nents,
2400 (wr->iser_ib_op == ISER_IB_RDMA_WRITE) ?
2401 DMA_TO_DEVICE : DMA_FROM_DEVICE);
2402 return ret;
2403}
2404
90ecc6e2
VP		 2405static int
2406isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2407{
2408 struct se_cmd *se_cmd = &cmd->se_cmd;
59464ef4 2409 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
90ecc6e2
VP		 2410 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2411 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
d40945d8 2412 struct isert_device *device = isert_conn->conn_device;
90ecc6e2
VP		 2413 struct ib_send_wr *wr_failed;
2414 int rc;
2415
2416 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2417 isert_cmd, se_cmd->data_length);
2418 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
d40945d8 2419 rc = device->reg_rdma_mem(conn, cmd, wr);
90ecc6e2
VP		 2420 if (rc) {
2421 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2422 return rc;
2423 }
2424
b8d26b3b
NB		 2425 /*
2426 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2427 */
2428 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
04d9cd12 2429 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
b8d26b3b
NB		 2430 &isert_cmd->tx_desc.iscsi_header);
2431 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07
NB		 2432 isert_init_send_wr(isert_conn, isert_cmd,
2433 &isert_cmd->tx_desc.send_wr, true);
b8d26b3b 2434
b6b87a1d 2435 atomic_add(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 2436
2437 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2438 if (rc) {
2439 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
b6b87a1d 2440 atomic_sub(wr->send_wr_num + 1, &isert_conn->post_send_buf_count);
b8d26b3b 2441 }
90ecc6e2
VP		 2442 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data READ\n",
2443 isert_cmd);
b8d26b3b 2444
90ecc6e2 2445 return 1;
b8d26b3b
NB		 2446}
2447
2448static int
2449isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2450{
2451 struct se_cmd *se_cmd = &cmd->se_cmd;
d703ce2f 2452 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2453 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2454 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
d40945d8 2455 struct isert_device *device = isert_conn->conn_device;
90ecc6e2
VP		 2456 struct ib_send_wr *wr_failed;
2457 int rc;
b8d26b3b 2458
90ecc6e2
VP		 2459 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2460 isert_cmd, se_cmd->data_length, cmd->write_data_done);
b8d26b3b 2461 wr->iser_ib_op = ISER_IB_RDMA_READ;
d40945d8 2462 rc = device->reg_rdma_mem(conn, cmd, wr);
90ecc6e2
VP		 2463 if (rc) {
2464 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2465 return rc;
b8d26b3b
NB		 2466 }
2467
b6b87a1d 2468 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 2469
2470 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2471 if (rc) {
2472 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
b6b87a1d 2473 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b 2474 }
90ecc6e2
VP		 2475 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2476 isert_cmd);
b8d26b3b 2477
90ecc6e2 2478 return 0;
b8d26b3b
NB		 2479}
2480
2481static int
2482isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2483{
2484 int ret;
2485
2486 switch (state) {
2487 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2488 ret = isert_put_nopin(cmd, conn, false);
2489 break;
2490 default:
2491 pr_err("Unknown immediate state: 0x%02x\n", state);
2492 ret = -EINVAL;
2493 break;
2494 }
2495
2496 return ret;
2497}
2498
2499static int
2500isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2501{
2502 int ret;
2503
2504 switch (state) {
2505 case ISTATE_SEND_LOGOUTRSP:
2506 ret = isert_put_logout_rsp(cmd, conn);
2507 if (!ret) {
2508 pr_debug("Returning iSER Logout -EAGAIN\n");
2509 ret = -EAGAIN;
2510 }
2511 break;
2512 case ISTATE_SEND_NOPIN:
2513 ret = isert_put_nopin(cmd, conn, true);
2514 break;
2515 case ISTATE_SEND_TASKMGTRSP:
2516 ret = isert_put_tm_rsp(cmd, conn);
2517 break;
2518 case ISTATE_SEND_REJECT:
2519 ret = isert_put_reject(cmd, conn);
2520 break;
adb54c29
NB		 2521 case ISTATE_SEND_TEXTRSP:
2522 ret = isert_put_text_rsp(cmd, conn);
2523 break;
b8d26b3b
NB		 2524 case ISTATE_SEND_STATUS:
2525 /*
2526 * Special case for sending non GOOD SCSI status from TX thread
2527 * context during pre se_cmd excecution failure.
2528 */
2529 ret = isert_put_response(conn, cmd);
2530 break;
2531 default:
2532 pr_err("Unknown response state: 0x%02x\n", state);
2533 ret = -EINVAL;
2534 break;
2535 }
2536
2537 return ret;
2538}
2539
2540static int
2541isert_setup_np(struct iscsi_np *np,
2542 struct __kernel_sockaddr_storage *ksockaddr)
2543{
2544 struct isert_np *isert_np;
2545 struct rdma_cm_id *isert_lid;
2546 struct sockaddr *sa;
2547 int ret;
2548
2549 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2550 if (!isert_np) {
2551 pr_err("Unable to allocate struct isert_np\n");
2552 return -ENOMEM;
2553 }
2554 init_waitqueue_head(&isert_np->np_accept_wq);
2555 mutex_init(&isert_np->np_accept_mutex);
2556 INIT_LIST_HEAD(&isert_np->np_accept_list);
2557 init_completion(&isert_np->np_login_comp);
2558
2559 sa = (struct sockaddr *)ksockaddr;
2560 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
2561 /*
2562 * Setup the np->np_sockaddr from the passed sockaddr setup
2563 * in iscsi_target_configfs.c code..
2564 */
2565 memcpy(&np->np_sockaddr, ksockaddr,
2566 sizeof(struct __kernel_sockaddr_storage));
2567
2568 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
2569 IB_QPT_RC);
2570 if (IS_ERR(isert_lid)) {
2571 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
2572 PTR_ERR(isert_lid));
2573 ret = PTR_ERR(isert_lid);
2574 goto out;
2575 }
2576
2577 ret = rdma_bind_addr(isert_lid, sa);
2578 if (ret) {
2579 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
2580 goto out_lid;
2581 }
2582
2583 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
2584 if (ret) {
2585 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
2586 goto out_lid;
2587 }
2588
2589 isert_np->np_cm_id = isert_lid;
2590 np->np_context = isert_np;
2591 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
2592
2593 return 0;
2594
2595out_lid:
2596 rdma_destroy_id(isert_lid);
2597out:
2598 kfree(isert_np);
2599 return ret;
2600}
2601
2602static int
2603isert_check_accept_queue(struct isert_np *isert_np)
2604{
2605 int empty;
2606
2607 mutex_lock(&isert_np->np_accept_mutex);
2608 empty = list_empty(&isert_np->np_accept_list);
2609 mutex_unlock(&isert_np->np_accept_mutex);
2610
2611 return empty;
2612}
2613
2614static int
2615isert_rdma_accept(struct isert_conn *isert_conn)
2616{
2617 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2618 struct rdma_conn_param cp;
2619 int ret;
2620
2621 memset(&cp, 0, sizeof(struct rdma_conn_param));
2622 cp.responder_resources = isert_conn->responder_resources;
2623 cp.initiator_depth = isert_conn->initiator_depth;
2624 cp.retry_count = 7;
2625 cp.rnr_retry_count = 7;
2626
2627 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
2628
2629 ret = rdma_accept(cm_id, &cp);
2630 if (ret) {
2631 pr_err("rdma_accept() failed with: %d\n", ret);
2632 return ret;
2633 }
2634
2635 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
2636
2637 return 0;
2638}
2639
2640static int
2641isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2642{
2643 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2644 int ret;
2645
2646 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
6faaa85f
NB		 2647 /*
2648 * For login requests after the first PDU, isert_rx_login_req() will
2649 * kick schedule_delayed_work(&conn->login_work) as the packet is
2650 * received, which turns this callback from iscsi_target_do_login_rx()
2651 * into a NOP.
2652 */
2653 if (!login->first_request)
2654 return 0;
b8d26b3b
NB		 2655
2656 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
2657 if (ret)
2658 return ret;
2659
2660 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
2661 return 0;
2662}
2663
2664static void
2665isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2666 struct isert_conn *isert_conn)
2667{
2668 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
2669 struct rdma_route *cm_route = &cm_id->route;
2670 struct sockaddr_in *sock_in;
2671 struct sockaddr_in6 *sock_in6;
2672
2673 conn->login_family = np->np_sockaddr.ss_family;
2674
2675 if (np->np_sockaddr.ss_family == AF_INET6) {
2676 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
2677 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
2678 &sock_in6->sin6_addr.in6_u);
2679 conn->login_port = ntohs(sock_in6->sin6_port);
2680
2681 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
2682 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
2683 &sock_in6->sin6_addr.in6_u);
2684 conn->local_port = ntohs(sock_in6->sin6_port);
2685 } else {
2686 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
2687 sprintf(conn->login_ip, "%pI4",
2688 &sock_in->sin_addr.s_addr);
2689 conn->login_port = ntohs(sock_in->sin_port);
2690
2691 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
2692 sprintf(conn->local_ip, "%pI4",
2693 &sock_in->sin_addr.s_addr);
2694 conn->local_port = ntohs(sock_in->sin_port);
2695 }
2696}
2697
2698static int
2699isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2700{
2701 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2702 struct isert_conn *isert_conn;
2703 int max_accept = 0, ret;
2704
2705accept_wait:
2706 ret = wait_event_interruptible(isert_np->np_accept_wq,
2707 !isert_check_accept_queue(isert_np) ||
2708 np->np_thread_state == ISCSI_NP_THREAD_RESET);
2709 if (max_accept > 5)
2710 return -ENODEV;
2711
2712 spin_lock_bh(&np->np_thread_lock);
2713 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
2714 spin_unlock_bh(&np->np_thread_lock);
2715 pr_err("ISCSI_NP_THREAD_RESET for isert_accept_np\n");
2716 return -ENODEV;
2717 }
2718 spin_unlock_bh(&np->np_thread_lock);
2719
2720 mutex_lock(&isert_np->np_accept_mutex);
2721 if (list_empty(&isert_np->np_accept_list)) {
2722 mutex_unlock(&isert_np->np_accept_mutex);
2723 max_accept++;
2724 goto accept_wait;
2725 }
2726 isert_conn = list_first_entry(&isert_np->np_accept_list,
2727 struct isert_conn, conn_accept_node);
2728 list_del_init(&isert_conn->conn_accept_node);
2729 mutex_unlock(&isert_np->np_accept_mutex);
2730
2731 conn->context = isert_conn;
2732 isert_conn->conn = conn;
2733 max_accept = 0;
2734
2735 ret = isert_rdma_post_recvl(isert_conn);
2736 if (ret)
2737 return ret;
2738
2739 ret = isert_rdma_accept(isert_conn);
2740 if (ret)
2741 return ret;
2742
2743 isert_set_conn_info(np, conn, isert_conn);
2744
2745 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
2746 return 0;
2747}
2748
2749static void
2750isert_free_np(struct iscsi_np *np)
2751{
2752 struct isert_np *isert_np = (struct isert_np *)np->np_context;
2753
2754 rdma_destroy_id(isert_np->np_cm_id);
2755
2756 np->np_context = NULL;
2757 kfree(isert_np);
2758}
2759
defd8848 2760static void isert_wait_conn(struct iscsi_conn *conn)
b8d26b3b
NB		 2761{
2762 struct isert_conn *isert_conn = conn->context;
2763
defd8848 2764 pr_debug("isert_wait_conn: Starting \n");
b8d26b3b
NB		 2765 /*
2766 * Decrement post_send_buf_count for special case when called
2767 * from isert_do_control_comp() -> iscsit_logout_post_handler()
2768 */
b2cb9649 2769 mutex_lock(&isert_conn->conn_mutex);
b8d26b3b
NB		 2770 if (isert_conn->logout_posted)
2771 atomic_dec(&isert_conn->post_send_buf_count);
2772
b2cb9649 2773 if (isert_conn->conn_cm_id && isert_conn->state != ISER_CONN_DOWN) {
defd8848 2774 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
b8d26b3b 2775 rdma_disconnect(isert_conn->conn_cm_id);
b2cb9649 2776 }
b8d26b3b
NB		 2777 /*
2778 * Only wait for conn_wait_comp_err if the isert_conn made it
2779 * into full feature phase..
2780 */
b2cb9649
NB		 2781 if (isert_conn->state == ISER_CONN_INIT) {
2782 mutex_unlock(&isert_conn->conn_mutex);
b2cb9649 2783 return;
b8d26b3b 2784 }
defd8848
NB		 2785 if (isert_conn->state == ISER_CONN_UP)
2786 isert_conn->state = ISER_CONN_TERMINATING;
b2cb9649 2787 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 2788
defd8848
NB		 2789 wait_for_completion(&isert_conn->conn_wait_comp_err);
2790
2791 wait_for_completion(&isert_conn->conn_wait);
2792}
2793
2794static void isert_free_conn(struct iscsi_conn *conn)
2795{
2796 struct isert_conn *isert_conn = conn->context;
b8d26b3b
NB		 2797
2798 isert_put_conn(isert_conn);
2799}
2800
2801static struct iscsit_transport iser_target_transport = {
2802 .name = "IB/iSER",
2803 .transport_type = ISCSI_INFINIBAND,
d703ce2f 2804 .priv_size = sizeof(struct isert_cmd),
b8d26b3b
NB		 2805 .owner = THIS_MODULE,
2806 .iscsit_setup_np = isert_setup_np,
2807 .iscsit_accept_np = isert_accept_np,
2808 .iscsit_free_np = isert_free_np,
defd8848 2809 .iscsit_wait_conn = isert_wait_conn,
b8d26b3b 2810 .iscsit_free_conn = isert_free_conn,
b8d26b3b
NB		 2811 .iscsit_get_login_rx = isert_get_login_rx,
2812 .iscsit_put_login_tx = isert_put_login_tx,
2813 .iscsit_immediate_queue = isert_immediate_queue,
2814 .iscsit_response_queue = isert_response_queue,
2815 .iscsit_get_dataout = isert_get_dataout,
2816 .iscsit_queue_data_in = isert_put_datain,
2817 .iscsit_queue_status = isert_put_response,
2818};
2819
2820static int __init isert_init(void)
2821{
2822 int ret;
2823
2824 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
2825 if (!isert_rx_wq) {
2826 pr_err("Unable to allocate isert_rx_wq\n");
2827 return -ENOMEM;
2828 }
2829
2830 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
2831 if (!isert_comp_wq) {
2832 pr_err("Unable to allocate isert_comp_wq\n");
2833 ret = -ENOMEM;
2834 goto destroy_rx_wq;
2835 }
2836
b8d26b3b
NB		 2837 iscsit_register_transport(&iser_target_transport);
2838 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
2839 return 0;
2840
b8d26b3b
NB		 2841destroy_rx_wq:
2842 destroy_workqueue(isert_rx_wq);
2843 return ret;
2844}
2845
2846static void __exit isert_exit(void)
2847{
b8d26b3b
NB		 2848 destroy_workqueue(isert_comp_wq);
2849 destroy_workqueue(isert_rx_wq);
2850 iscsit_unregister_transport(&iser_target_transport);
2851 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
2852}
2853
2854MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2855MODULE_VERSION("0.1");
2856MODULE_AUTHOR("nab@Linux-iSCSI.org");
2857MODULE_LICENSE("GPL");
2858
2859module_init(isert_init);
2860module_exit(isert_exit);
Linux kernel - Deliverables
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