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[mirror_ubuntu-zesty-kernel.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>
531b7bf4 31#include <linux/semaphore.h>
b8d26b3b
NB		 32
33#include "isert_proto.h"
34#include "ib_isert.h"
35
36#define ISERT_MAX_CONN 8
37#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
38#define ISER_MAX_TX_CQ_LEN (ISERT_QP_MAX_REQ_DTOS * ISERT_MAX_CONN)
39
40static DEFINE_MUTEX(device_list_mutex);
41static LIST_HEAD(device_list);
42static struct workqueue_struct *isert_rx_wq;
43static struct workqueue_struct *isert_comp_wq;
b8d26b3b 44
d40945d8
VP		 45static void
46isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
47static int
48isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
49 struct isert_rdma_wr *wr);
59464ef4 50static void
a3a5a826 51isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn);
59464ef4 52static int
a3a5a826
SG		 53isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
54 struct isert_rdma_wr *wr);
f93f3a70
SG		 55static int
56isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
d40945d8 57
b8d26b3b
NB		 58static void
59isert_qp_event_callback(struct ib_event *e, void *context)
60{
61 struct isert_conn *isert_conn = (struct isert_conn *)context;
62
63 pr_err("isert_qp_event_callback event: %d\n", e->event);
64 switch (e->event) {
65 case IB_EVENT_COMM_EST:
66 rdma_notify(isert_conn->conn_cm_id, IB_EVENT_COMM_EST);
67 break;
68 case IB_EVENT_QP_LAST_WQE_REACHED:
69 pr_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED:\n");
70 break;
71 default:
72 break;
73 }
74}
75
76static int
77isert_query_device(struct ib_device *ib_dev, struct ib_device_attr *devattr)
78{
79 int ret;
80
81 ret = ib_query_device(ib_dev, devattr);
82 if (ret) {
83 pr_err("ib_query_device() failed: %d\n", ret);
84 return ret;
85 }
86 pr_debug("devattr->max_sge: %d\n", devattr->max_sge);
87 pr_debug("devattr->max_sge_rd: %d\n", devattr->max_sge_rd);
88
89 return 0;
90}
91
92static int
d3e125da
SG		 93isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id,
94 u8 protection)
b8d26b3b
NB		 95{
96 struct isert_device *device = isert_conn->conn_device;
97 struct ib_qp_init_attr attr;
b8d26b3b
NB		 98 int ret, index, min_index = 0;
99
b8d26b3b
NB		 100 mutex_lock(&device_list_mutex);
101 for (index = 0; index < device->cqs_used; index++)
102 if (device->cq_active_qps[index] <
103 device->cq_active_qps[min_index])
104 min_index = index;
105 device->cq_active_qps[min_index]++;
106 pr_debug("isert_conn_setup_qp: Using min_index: %d\n", min_index);
107 mutex_unlock(&device_list_mutex);
108
109 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
110 attr.event_handler = isert_qp_event_callback;
111 attr.qp_context = isert_conn;
112 attr.send_cq = device->dev_tx_cq[min_index];
113 attr.recv_cq = device->dev_rx_cq[min_index];
114 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS;
115 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS;
116 /*
117 * FIXME: Use devattr.max_sge - 2 for max_send_sge as
118 * work-around for RDMA_READ..
119 */
59464ef4 120 attr.cap.max_send_sge = device->dev_attr.max_sge - 2;
b8d26b3b
NB		 121 isert_conn->max_sge = attr.cap.max_send_sge;
122
123 attr.cap.max_recv_sge = 1;
124 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
125 attr.qp_type = IB_QPT_RC;
d3e125da
SG		 126 if (protection)
127 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
b8d26b3b
NB		 128
129 pr_debug("isert_conn_setup_qp cma_id->device: %p\n",
130 cma_id->device);
131 pr_debug("isert_conn_setup_qp conn_pd->device: %p\n",
132 isert_conn->conn_pd->device);
133
134 ret = rdma_create_qp(cma_id, isert_conn->conn_pd, &attr);
135 if (ret) {
136 pr_err("rdma_create_qp failed for cma_id %d\n", ret);
137 return ret;
138 }
139 isert_conn->conn_qp = cma_id->qp;
140 pr_debug("rdma_create_qp() returned success >>>>>>>>>>>>>>>>>>>>>>>>>.\n");
141
142 return 0;
143}
144
145static void
146isert_cq_event_callback(struct ib_event *e, void *context)
147{
148 pr_debug("isert_cq_event_callback event: %d\n", e->event);
149}
150
151static int
152isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
153{
154 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
155 struct iser_rx_desc *rx_desc;
156 struct ib_sge *rx_sg;
157 u64 dma_addr;
158 int i, j;
159
160 isert_conn->conn_rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
161 sizeof(struct iser_rx_desc), GFP_KERNEL);
162 if (!isert_conn->conn_rx_descs)
163 goto fail;
164
165 rx_desc = isert_conn->conn_rx_descs;
166
167 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
168 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
169 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
170 if (ib_dma_mapping_error(ib_dev, dma_addr))
171 goto dma_map_fail;
172
173 rx_desc->dma_addr = dma_addr;
174
175 rx_sg = &rx_desc->rx_sg;
176 rx_sg->addr = rx_desc->dma_addr;
177 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
178 rx_sg->lkey = isert_conn->conn_mr->lkey;
179 }
180
181 isert_conn->conn_rx_desc_head = 0;
182 return 0;
183
184dma_map_fail:
185 rx_desc = isert_conn->conn_rx_descs;
186 for (j = 0; j < i; j++, rx_desc++) {
187 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
188 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
189 }
190 kfree(isert_conn->conn_rx_descs);
191 isert_conn->conn_rx_descs = NULL;
192fail:
193 return -ENOMEM;
194}
195
196static void
197isert_free_rx_descriptors(struct isert_conn *isert_conn)
198{
199 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
200 struct iser_rx_desc *rx_desc;
201 int i;
202
203 if (!isert_conn->conn_rx_descs)
204 return;
205
206 rx_desc = isert_conn->conn_rx_descs;
207 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
208 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
209 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
210 }
211
212 kfree(isert_conn->conn_rx_descs);
213 isert_conn->conn_rx_descs = NULL;
214}
215
2853c2b6 216static void isert_cq_tx_work(struct work_struct *);
b8d26b3b 217static void isert_cq_tx_callback(struct ib_cq *, void *);
2853c2b6 218static void isert_cq_rx_work(struct work_struct *);
b8d26b3b
NB		 219static void isert_cq_rx_callback(struct ib_cq *, void *);
220
221static int
222isert_create_device_ib_res(struct isert_device *device)
223{
224 struct ib_device *ib_dev = device->ib_device;
225 struct isert_cq_desc *cq_desc;
59464ef4 226 struct ib_device_attr *dev_attr;
b8d26b3b
NB		 227 int ret = 0, i, j;
228
59464ef4
VP		 229 dev_attr = &device->dev_attr;
230 ret = isert_query_device(ib_dev, dev_attr);
231 if (ret)
232 return ret;
233
d40945d8 234 /* asign function handlers */
f2252258
SG		 235 if (dev_attr->device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS &&
236 dev_attr->device_cap_flags & IB_DEVICE_SIGNATURE_HANDOVER) {
a3a5a826
SG		 237 device->use_fastreg = 1;
238 device->reg_rdma_mem = isert_reg_rdma;
239 device->unreg_rdma_mem = isert_unreg_rdma;
59464ef4 240 } else {
a3a5a826 241 device->use_fastreg = 0;
59464ef4
VP		 242 device->reg_rdma_mem = isert_map_rdma;
243 device->unreg_rdma_mem = isert_unmap_cmd;
244 }
d40945d8 245
d3e125da
SG		 246 /* Check signature cap */
247 device->pi_capable = dev_attr->device_cap_flags &
248 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
249
b8d26b3b
NB		 250 device->cqs_used = min_t(int, num_online_cpus(),
251 device->ib_device->num_comp_vectors);
252 device->cqs_used = min(ISERT_MAX_CQ, device->cqs_used);
a3a5a826 253 pr_debug("Using %d CQs, device %s supports %d vectors support "
d3e125da 254 "Fast registration %d pi_capable %d\n",
b8d26b3b 255 device->cqs_used, device->ib_device->name,
d3e125da
SG		 256 device->ib_device->num_comp_vectors, device->use_fastreg,
257 device->pi_capable);
b8d26b3b
NB		 258 device->cq_desc = kzalloc(sizeof(struct isert_cq_desc) *
259 device->cqs_used, GFP_KERNEL);
260 if (!device->cq_desc) {
261 pr_err("Unable to allocate device->cq_desc\n");
262 return -ENOMEM;
263 }
264 cq_desc = device->cq_desc;
265
b8d26b3b
NB		 266 for (i = 0; i < device->cqs_used; i++) {
267 cq_desc[i].device = device;
268 cq_desc[i].cq_index = i;
269
2853c2b6 270 INIT_WORK(&cq_desc[i].cq_rx_work, isert_cq_rx_work);
b8d26b3b
NB		 271 device->dev_rx_cq[i] = ib_create_cq(device->ib_device,
272 isert_cq_rx_callback,
273 isert_cq_event_callback,
274 (void *)&cq_desc[i],
275 ISER_MAX_RX_CQ_LEN, i);
94a71110
WY		 276 if (IS_ERR(device->dev_rx_cq[i])) {
277 ret = PTR_ERR(device->dev_rx_cq[i]);
278 device->dev_rx_cq[i] = NULL;
b8d26b3b 279 goto out_cq;
94a71110 280 }
b8d26b3b 281
2853c2b6 282 INIT_WORK(&cq_desc[i].cq_tx_work, isert_cq_tx_work);
b8d26b3b
NB		 283 device->dev_tx_cq[i] = ib_create_cq(device->ib_device,
284 isert_cq_tx_callback,
285 isert_cq_event_callback,
286 (void *)&cq_desc[i],
287 ISER_MAX_TX_CQ_LEN, i);
94a71110
WY		 288 if (IS_ERR(device->dev_tx_cq[i])) {
289 ret = PTR_ERR(device->dev_tx_cq[i]);
290 device->dev_tx_cq[i] = NULL;
b8d26b3b 291 goto out_cq;
94a71110 292 }
b8d26b3b 293
94a71110
WY		 294 ret = ib_req_notify_cq(device->dev_rx_cq[i], IB_CQ_NEXT_COMP);
295 if (ret)
b8d26b3b
NB		 296 goto out_cq;
297
94a71110
WY		 298 ret = ib_req_notify_cq(device->dev_tx_cq[i], IB_CQ_NEXT_COMP);
299 if (ret)
b8d26b3b
NB		 300 goto out_cq;
301 }
302
b8d26b3b
NB		 303 return 0;
304
305out_cq:
306 for (j = 0; j < i; j++) {
307 cq_desc = &device->cq_desc[j];
308
309 if (device->dev_rx_cq[j]) {
310 cancel_work_sync(&cq_desc->cq_rx_work);
311 ib_destroy_cq(device->dev_rx_cq[j]);
312 }
313 if (device->dev_tx_cq[j]) {
314 cancel_work_sync(&cq_desc->cq_tx_work);
315 ib_destroy_cq(device->dev_tx_cq[j]);
316 }
317 }
b8d26b3b
NB		 318 kfree(device->cq_desc);
319
320 return ret;
321}
322
323static void
324isert_free_device_ib_res(struct isert_device *device)
325{
326 struct isert_cq_desc *cq_desc;
327 int i;
328
329 for (i = 0; i < device->cqs_used; i++) {
330 cq_desc = &device->cq_desc[i];
331
332 cancel_work_sync(&cq_desc->cq_rx_work);
333 cancel_work_sync(&cq_desc->cq_tx_work);
334 ib_destroy_cq(device->dev_rx_cq[i]);
335 ib_destroy_cq(device->dev_tx_cq[i]);
336 device->dev_rx_cq[i] = NULL;
337 device->dev_tx_cq[i] = NULL;
338 }
339
b8d26b3b
NB		 340 kfree(device->cq_desc);
341}
342
343static void
344isert_device_try_release(struct isert_device *device)
345{
346 mutex_lock(&device_list_mutex);
347 device->refcount--;
348 if (!device->refcount) {
349 isert_free_device_ib_res(device);
350 list_del(&device->dev_node);
351 kfree(device);
352 }
353 mutex_unlock(&device_list_mutex);
354}
355
356static struct isert_device *
357isert_device_find_by_ib_dev(struct rdma_cm_id *cma_id)
358{
359 struct isert_device *device;
360 int ret;
361
362 mutex_lock(&device_list_mutex);
363 list_for_each_entry(device, &device_list, dev_node) {
364 if (device->ib_device->node_guid == cma_id->device->node_guid) {
365 device->refcount++;
366 mutex_unlock(&device_list_mutex);
367 return device;
368 }
369 }
370
371 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
372 if (!device) {
373 mutex_unlock(&device_list_mutex);
374 return ERR_PTR(-ENOMEM);
375 }
376
377 INIT_LIST_HEAD(&device->dev_node);
378
379 device->ib_device = cma_id->device;
380 ret = isert_create_device_ib_res(device);
381 if (ret) {
382 kfree(device);
383 mutex_unlock(&device_list_mutex);
384 return ERR_PTR(ret);
385 }
386
387 device->refcount++;
388 list_add_tail(&device->dev_node, &device_list);
389 mutex_unlock(&device_list_mutex);
390
391 return device;
392}
393
59464ef4 394static void
a3a5a826 395isert_conn_free_fastreg_pool(struct isert_conn *isert_conn)
59464ef4
VP		 396{
397 struct fast_reg_descriptor *fr_desc, *tmp;
398 int i = 0;
399
a3a5a826 400 if (list_empty(&isert_conn->conn_fr_pool))
59464ef4
VP		 401 return;
402
a3a5a826 403 pr_debug("Freeing conn %p fastreg pool", isert_conn);
59464ef4
VP		 404
405 list_for_each_entry_safe(fr_desc, tmp,
a3a5a826 406 &isert_conn->conn_fr_pool, list) {
59464ef4
VP		 407 list_del(&fr_desc->list);
408 ib_free_fast_reg_page_list(fr_desc->data_frpl);
409 ib_dereg_mr(fr_desc->data_mr);
d3e125da
SG		 410 if (fr_desc->pi_ctx) {
411 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
412 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
413 ib_destroy_mr(fr_desc->pi_ctx->sig_mr);
414 kfree(fr_desc->pi_ctx);
415 }
59464ef4
VP		 416 kfree(fr_desc);
417 ++i;
418 }
419
a3a5a826 420 if (i < isert_conn->conn_fr_pool_size)
59464ef4 421 pr_warn("Pool still has %d regions registered\n",
a3a5a826 422 isert_conn->conn_fr_pool_size - i);
59464ef4
VP		 423}
424
dc87a90f
SG		 425static int
426isert_create_fr_desc(struct ib_device *ib_device, struct ib_pd *pd,
d3e125da 427 struct fast_reg_descriptor *fr_desc, u8 protection)
dc87a90f 428{
d3e125da
SG		 429 int ret;
430
dc87a90f
SG		 431 fr_desc->data_frpl = ib_alloc_fast_reg_page_list(ib_device,
432 ISCSI_ISER_SG_TABLESIZE);
433 if (IS_ERR(fr_desc->data_frpl)) {
434 pr_err("Failed to allocate data frpl err=%ld\n",
435 PTR_ERR(fr_desc->data_frpl));
436 return PTR_ERR(fr_desc->data_frpl);
437 }
438
439 fr_desc->data_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
440 if (IS_ERR(fr_desc->data_mr)) {
441 pr_err("Failed to allocate data frmr err=%ld\n",
442 PTR_ERR(fr_desc->data_mr));
d3e125da
SG		 443 ret = PTR_ERR(fr_desc->data_mr);
444 goto err_data_frpl;
dc87a90f
SG		 445 }
446 pr_debug("Create fr_desc %p page_list %p\n",
447 fr_desc, fr_desc->data_frpl->page_list);
d3e125da
SG		 448 fr_desc->ind |= ISERT_DATA_KEY_VALID;
449
450 if (protection) {
451 struct ib_mr_init_attr mr_init_attr = {0};
452 struct pi_context *pi_ctx;
453
454 fr_desc->pi_ctx = kzalloc(sizeof(*fr_desc->pi_ctx), GFP_KERNEL);
455 if (!fr_desc->pi_ctx) {
456 pr_err("Failed to allocate pi context\n");
457 ret = -ENOMEM;
458 goto err_data_mr;
459 }
460 pi_ctx = fr_desc->pi_ctx;
461
462 pi_ctx->prot_frpl = ib_alloc_fast_reg_page_list(ib_device,
463 ISCSI_ISER_SG_TABLESIZE);
464 if (IS_ERR(pi_ctx->prot_frpl)) {
465 pr_err("Failed to allocate prot frpl err=%ld\n",
466 PTR_ERR(pi_ctx->prot_frpl));
467 ret = PTR_ERR(pi_ctx->prot_frpl);
468 goto err_pi_ctx;
469 }
dc87a90f 470
d3e125da
SG		 471 pi_ctx->prot_mr = ib_alloc_fast_reg_mr(pd, ISCSI_ISER_SG_TABLESIZE);
472 if (IS_ERR(pi_ctx->prot_mr)) {
473 pr_err("Failed to allocate prot frmr err=%ld\n",
474 PTR_ERR(pi_ctx->prot_mr));
475 ret = PTR_ERR(pi_ctx->prot_mr);
476 goto err_prot_frpl;
477 }
478 fr_desc->ind |= ISERT_PROT_KEY_VALID;
479
480 mr_init_attr.max_reg_descriptors = 2;
481 mr_init_attr.flags |= IB_MR_SIGNATURE_EN;
482 pi_ctx->sig_mr = ib_create_mr(pd, &mr_init_attr);
483 if (IS_ERR(pi_ctx->sig_mr)) {
484 pr_err("Failed to allocate signature enabled mr err=%ld\n",
485 PTR_ERR(pi_ctx->sig_mr));
486 ret = PTR_ERR(pi_ctx->sig_mr);
487 goto err_prot_mr;
488 }
489 fr_desc->ind |= ISERT_SIG_KEY_VALID;
490 }
491 fr_desc->ind &= ~ISERT_PROTECTED;
dc87a90f
SG		 492
493 return 0;
d3e125da
SG		 494err_prot_mr:
495 ib_dereg_mr(fr_desc->pi_ctx->prot_mr);
496err_prot_frpl:
497 ib_free_fast_reg_page_list(fr_desc->pi_ctx->prot_frpl);
498err_pi_ctx:
499 kfree(fr_desc->pi_ctx);
500err_data_mr:
501 ib_dereg_mr(fr_desc->data_mr);
502err_data_frpl:
503 ib_free_fast_reg_page_list(fr_desc->data_frpl);
504
505 return ret;
59464ef4
VP		 506}
507
508static int
d3e125da 509isert_conn_create_fastreg_pool(struct isert_conn *isert_conn, u8 pi_support)
59464ef4
VP		 510{
511 struct fast_reg_descriptor *fr_desc;
512 struct isert_device *device = isert_conn->conn_device;
f46d6a8a
NB		 513 struct se_session *se_sess = isert_conn->conn->sess->se_sess;
514 struct se_node_acl *se_nacl = se_sess->se_node_acl;
515 int i, ret, tag_num;
516 /*
517 * Setup the number of FRMRs based upon the number of tags
518 * available to session in iscsi_target_locate_portal().
519 */
520 tag_num = max_t(u32, ISCSIT_MIN_TAGS, se_nacl->queue_depth);
521 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
59464ef4 522
a3a5a826 523 isert_conn->conn_fr_pool_size = 0;
f46d6a8a 524 for (i = 0; i < tag_num; i++) {
59464ef4
VP		 525 fr_desc = kzalloc(sizeof(*fr_desc), GFP_KERNEL);
526 if (!fr_desc) {
527 pr_err("Failed to allocate fast_reg descriptor\n");
528 ret = -ENOMEM;
529 goto err;
530 }
531
dc87a90f 532 ret = isert_create_fr_desc(device->ib_device,
d3e125da
SG		 533 isert_conn->conn_pd, fr_desc,
534 pi_support);
dc87a90f
SG		 535 if (ret) {
536 pr_err("Failed to create fastreg descriptor err=%d\n",
537 ret);
a80e21b3 538 kfree(fr_desc);
59464ef4
VP		 539 goto err;
540 }
59464ef4 541
a3a5a826
SG		 542 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
543 isert_conn->conn_fr_pool_size++;
59464ef4
VP		 544 }
545
a3a5a826
SG		 546 pr_debug("Creating conn %p fastreg pool size=%d",
547 isert_conn, isert_conn->conn_fr_pool_size);
59464ef4
VP		 548
549 return 0;
550
551err:
a3a5a826 552 isert_conn_free_fastreg_pool(isert_conn);
59464ef4
VP		 553 return ret;
554}
555
b8d26b3b
NB		 556static int
557isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
558{
559 struct iscsi_np *np = cma_id->context;
560 struct isert_np *isert_np = np->np_context;
561 struct isert_conn *isert_conn;
562 struct isert_device *device;
563 struct ib_device *ib_dev = cma_id->device;
564 int ret = 0;
14f4b54f
SG		 565 u8 pi_support;
566
567 spin_lock_bh(&np->np_thread_lock);
568 if (!np->enabled) {
569 spin_unlock_bh(&np->np_thread_lock);
570 pr_debug("iscsi_np is not enabled, reject connect request\n");
571 return rdma_reject(cma_id, NULL, 0);
572 }
573 spin_unlock_bh(&np->np_thread_lock);
b8d26b3b
NB		 574
575 pr_debug("Entering isert_connect_request cma_id: %p, context: %p\n",
576 cma_id, cma_id->context);
577
578 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
579 if (!isert_conn) {
580 pr_err("Unable to allocate isert_conn\n");
581 return -ENOMEM;
582 }
583 isert_conn->state = ISER_CONN_INIT;
584 INIT_LIST_HEAD(&isert_conn->conn_accept_node);
585 init_completion(&isert_conn->conn_login_comp);
defd8848
NB		 586 init_completion(&isert_conn->conn_wait);
587 init_completion(&isert_conn->conn_wait_comp_err);
b8d26b3b 588 kref_init(&isert_conn->conn_kref);
b2cb9649 589 mutex_init(&isert_conn->conn_mutex);
59464ef4 590 spin_lock_init(&isert_conn->conn_lock);
f46d6a8a 591 INIT_LIST_HEAD(&isert_conn->conn_fr_pool);
b8d26b3b
NB		 592
593 cma_id->context = isert_conn;
594 isert_conn->conn_cm_id = cma_id;
b8d26b3b
NB		 595
596 isert_conn->login_buf = kzalloc(ISCSI_DEF_MAX_RECV_SEG_LEN +
597 ISER_RX_LOGIN_SIZE, GFP_KERNEL);
598 if (!isert_conn->login_buf) {
599 pr_err("Unable to allocate isert_conn->login_buf\n");
600 ret = -ENOMEM;
601 goto out;
602 }
603
604 isert_conn->login_req_buf = isert_conn->login_buf;
605 isert_conn->login_rsp_buf = isert_conn->login_buf +
606 ISCSI_DEF_MAX_RECV_SEG_LEN;
607 pr_debug("Set login_buf: %p login_req_buf: %p login_rsp_buf: %p\n",
608 isert_conn->login_buf, isert_conn->login_req_buf,
609 isert_conn->login_rsp_buf);
610
611 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
612 (void *)isert_conn->login_req_buf,
613 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
614
615 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
616 if (ret) {
617 pr_err("ib_dma_mapping_error failed for login_req_dma: %d\n",
618 ret);
619 isert_conn->login_req_dma = 0;
620 goto out_login_buf;
621 }
622
623 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
624 (void *)isert_conn->login_rsp_buf,
625 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
626
627 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
628 if (ret) {
629 pr_err("ib_dma_mapping_error failed for login_rsp_dma: %d\n",
630 ret);
631 isert_conn->login_rsp_dma = 0;
632 goto out_req_dma_map;
633 }
634
635 device = isert_device_find_by_ib_dev(cma_id);
636 if (IS_ERR(device)) {
637 ret = PTR_ERR(device);
638 goto out_rsp_dma_map;
639 }
640
1a92e17e
SG		 641 /* Set max inflight RDMA READ requests */
642 isert_conn->initiator_depth = min_t(u8,
643 event->param.conn.initiator_depth,
644 device->dev_attr.max_qp_init_rd_atom);
645 pr_debug("Using initiator_depth: %u\n", isert_conn->initiator_depth);
646
b8d26b3b 647 isert_conn->conn_device = device;
eb6ab132
SG		 648 isert_conn->conn_pd = ib_alloc_pd(isert_conn->conn_device->ib_device);
649 if (IS_ERR(isert_conn->conn_pd)) {
650 ret = PTR_ERR(isert_conn->conn_pd);
651 pr_err("ib_alloc_pd failed for conn %p: ret=%d\n",
652 isert_conn, ret);
653 goto out_pd;
654 }
b8d26b3b 655
eb6ab132
SG		 656 isert_conn->conn_mr = ib_get_dma_mr(isert_conn->conn_pd,
657 IB_ACCESS_LOCAL_WRITE);
658 if (IS_ERR(isert_conn->conn_mr)) {
659 ret = PTR_ERR(isert_conn->conn_mr);
660 pr_err("ib_get_dma_mr failed for conn %p: ret=%d\n",
661 isert_conn, ret);
662 goto out_mr;
663 }
b8d26b3b 664
14f4b54f 665 pi_support = np->tpg_np->tpg->tpg_attrib.t10_pi;
d3e125da 666 if (pi_support && !device->pi_capable) {
5f80ff8e
SG		 667 pr_err("Protection information requested but not supported, "
668 "rejecting connect request\n");
669 ret = rdma_reject(cma_id, NULL, 0);
d3e125da
SG		 670 goto out_mr;
671 }
672
d3e125da 673 ret = isert_conn_setup_qp(isert_conn, cma_id, pi_support);
b8d26b3b
NB		 674 if (ret)
675 goto out_conn_dev;
676
677 mutex_lock(&isert_np->np_accept_mutex);
9fe63c88 678 list_add_tail(&isert_conn->conn_accept_node, &isert_np->np_accept_list);
b8d26b3b
NB		 679 mutex_unlock(&isert_np->np_accept_mutex);
680
531b7bf4
SG		 681 pr_debug("isert_connect_request() up np_sem np: %p\n", np);
682 up(&isert_np->np_sem);
b8d26b3b
NB		 683 return 0;
684
685out_conn_dev:
eb6ab132
SG		 686 ib_dereg_mr(isert_conn->conn_mr);
687out_mr:
688 ib_dealloc_pd(isert_conn->conn_pd);
689out_pd:
b8d26b3b
NB		 690 isert_device_try_release(device);
691out_rsp_dma_map:
692 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
693 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
694out_req_dma_map:
695 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
696 ISCSI_DEF_MAX_RECV_SEG_LEN, DMA_FROM_DEVICE);
697out_login_buf:
698 kfree(isert_conn->login_buf);
699out:
700 kfree(isert_conn);
701 return ret;
702}
703
704static void
705isert_connect_release(struct isert_conn *isert_conn)
706{
707 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
708 struct isert_device *device = isert_conn->conn_device;
709 int cq_index;
710
711 pr_debug("Entering isert_connect_release(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
712
a3a5a826
SG		 713 if (device && device->use_fastreg)
714 isert_conn_free_fastreg_pool(isert_conn);
59464ef4 715
b8d26b3b
NB		 716 if (isert_conn->conn_qp) {
717 cq_index = ((struct isert_cq_desc *)
718 isert_conn->conn_qp->recv_cq->cq_context)->cq_index;
719 pr_debug("isert_connect_release: cq_index: %d\n", cq_index);
720 isert_conn->conn_device->cq_active_qps[cq_index]--;
721
722 rdma_destroy_qp(isert_conn->conn_cm_id);
723 }
724
725 isert_free_rx_descriptors(isert_conn);
726 rdma_destroy_id(isert_conn->conn_cm_id);
727
eb6ab132
SG		 728 ib_dereg_mr(isert_conn->conn_mr);
729 ib_dealloc_pd(isert_conn->conn_pd);
730
b8d26b3b
NB		 731 if (isert_conn->login_buf) {
732 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
733 ISER_RX_LOGIN_SIZE, DMA_TO_DEVICE);
734 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
735 ISCSI_DEF_MAX_RECV_SEG_LEN,
736 DMA_FROM_DEVICE);
737 kfree(isert_conn->login_buf);
738 }
739 kfree(isert_conn);
740
741 if (device)
742 isert_device_try_release(device);
743
744 pr_debug("Leaving isert_connect_release >>>>>>>>>>>>\n");
745}
746
747static void
748isert_connected_handler(struct rdma_cm_id *cma_id)
749{
c2f88b17
SG		 750 struct isert_conn *isert_conn = cma_id->context;
751
752 kref_get(&isert_conn->conn_kref);
b8d26b3b
NB		 753}
754
755static void
756isert_release_conn_kref(struct kref *kref)
757{
758 struct isert_conn *isert_conn = container_of(kref,
759 struct isert_conn, conn_kref);
760
761 pr_debug("Calling isert_connect_release for final kref %s/%d\n",
762 current->comm, current->pid);
763
764 isert_connect_release(isert_conn);
765}
766
767static void
768isert_put_conn(struct isert_conn *isert_conn)
769{
770 kref_put(&isert_conn->conn_kref, isert_release_conn_kref);
771}
772
773static void
774isert_disconnect_work(struct work_struct *work)
775{
776 struct isert_conn *isert_conn = container_of(work,
777 struct isert_conn, conn_logout_work);
778
779 pr_debug("isert_disconnect_work(): >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
b2cb9649 780 mutex_lock(&isert_conn->conn_mutex);
defd8848
NB		 781 if (isert_conn->state == ISER_CONN_UP)
782 isert_conn->state = ISER_CONN_TERMINATING;
b8d26b3b
NB		 783
784 if (isert_conn->post_recv_buf_count == 0 &&
785 atomic_read(&isert_conn->post_send_buf_count) == 0) {
b2cb9649
NB		 786 mutex_unlock(&isert_conn->conn_mutex);
787 goto wake_up;
788 }
789 if (!isert_conn->conn_cm_id) {
790 mutex_unlock(&isert_conn->conn_mutex);
791 isert_put_conn(isert_conn);
792 return;
b8d26b3b 793 }
9d49f5e2 794
88c4015f
SG		 795 if (isert_conn->disconnect) {
796 /* Send DREQ/DREP towards our initiator */
b2cb9649 797 rdma_disconnect(isert_conn->conn_cm_id);
b8d26b3b 798 }
9d49f5e2 799
b2cb9649 800 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 801
b2cb9649 802wake_up:
defd8848 803 complete(&isert_conn->conn_wait);
b8d26b3b
NB		 804}
805
806static void
88c4015f 807isert_disconnected_handler(struct rdma_cm_id *cma_id, bool disconnect)
b8d26b3b
NB		 808{
809 struct isert_conn *isert_conn = (struct isert_conn *)cma_id->context;
810
88c4015f 811 isert_conn->disconnect = disconnect;
b8d26b3b
NB		 812 INIT_WORK(&isert_conn->conn_logout_work, isert_disconnect_work);
813 schedule_work(&isert_conn->conn_logout_work);
814}
815
816static int
817isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
818{
819 int ret = 0;
88c4015f 820 bool disconnect = false;
b8d26b3b
NB		 821
822 pr_debug("isert_cma_handler: event %d status %d conn %p id %p\n",
823 event->event, event->status, cma_id->context, cma_id);
824
825 switch (event->event) {
826 case RDMA_CM_EVENT_CONNECT_REQUEST:
b8d26b3b
NB		 827 ret = isert_connect_request(cma_id, event);
828 break;
829 case RDMA_CM_EVENT_ESTABLISHED:
b8d26b3b
NB		 830 isert_connected_handler(cma_id);
831 break;
88c4015f
SG		 832 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
833 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
834 case RDMA_CM_EVENT_DEVICE_REMOVAL: /* FALLTHRU */
835 disconnect = true;
836 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
837 isert_disconnected_handler(cma_id, disconnect);
b8d26b3b
NB		 838 break;
839 case RDMA_CM_EVENT_CONNECT_ERROR:
840 default:
88c4015f 841 pr_err("Unhandled RDMA CMA event: %d\n", event->event);
b8d26b3b
NB		 842 break;
843 }
844
845 if (ret != 0) {
846 pr_err("isert_cma_handler failed RDMA_CM_EVENT: 0x%08x %d\n",
847 event->event, ret);
848 dump_stack();
849 }
850
851 return ret;
852}
853
854static int
855isert_post_recv(struct isert_conn *isert_conn, u32 count)
856{
857 struct ib_recv_wr *rx_wr, *rx_wr_failed;
858 int i, ret;
859 unsigned int rx_head = isert_conn->conn_rx_desc_head;
860 struct iser_rx_desc *rx_desc;
861
862 for (rx_wr = isert_conn->conn_rx_wr, i = 0; i < count; i++, rx_wr++) {
863 rx_desc = &isert_conn->conn_rx_descs[rx_head];
864 rx_wr->wr_id = (unsigned long)rx_desc;
865 rx_wr->sg_list = &rx_desc->rx_sg;
866 rx_wr->num_sge = 1;
867 rx_wr->next = rx_wr + 1;
868 rx_head = (rx_head + 1) & (ISERT_QP_MAX_RECV_DTOS - 1);
869 }
870
871 rx_wr--;
872 rx_wr->next = NULL; /* mark end of work requests list */
873
874 isert_conn->post_recv_buf_count += count;
875 ret = ib_post_recv(isert_conn->conn_qp, isert_conn->conn_rx_wr,
876 &rx_wr_failed);
877 if (ret) {
878 pr_err("ib_post_recv() failed with ret: %d\n", ret);
879 isert_conn->post_recv_buf_count -= count;
880 } else {
881 pr_debug("isert_post_recv(): Posted %d RX buffers\n", count);
882 isert_conn->conn_rx_desc_head = rx_head;
883 }
884 return ret;
885}
886
887static int
888isert_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
889{
890 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
891 struct ib_send_wr send_wr, *send_wr_failed;
892 int ret;
893
894 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
895 ISER_HEADERS_LEN, DMA_TO_DEVICE);
896
897 send_wr.next = NULL;
898 send_wr.wr_id = (unsigned long)tx_desc;
899 send_wr.sg_list = tx_desc->tx_sg;
900 send_wr.num_sge = tx_desc->num_sge;
901 send_wr.opcode = IB_WR_SEND;
902 send_wr.send_flags = IB_SEND_SIGNALED;
903
904 atomic_inc(&isert_conn->post_send_buf_count);
905
906 ret = ib_post_send(isert_conn->conn_qp, &send_wr, &send_wr_failed);
907 if (ret) {
908 pr_err("ib_post_send() failed, ret: %d\n", ret);
909 atomic_dec(&isert_conn->post_send_buf_count);
910 }
911
912 return ret;
913}
914
915static void
916isert_create_send_desc(struct isert_conn *isert_conn,
917 struct isert_cmd *isert_cmd,
918 struct iser_tx_desc *tx_desc)
919{
920 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
921
922 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
923 ISER_HEADERS_LEN, DMA_TO_DEVICE);
924
925 memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
926 tx_desc->iser_header.flags = ISER_VER;
927
928 tx_desc->num_sge = 1;
929 tx_desc->isert_cmd = isert_cmd;
930
931 if (tx_desc->tx_sg[0].lkey != isert_conn->conn_mr->lkey) {
932 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
933 pr_debug("tx_desc %p lkey mismatch, fixing\n", tx_desc);
934 }
935}
936
937static int
938isert_init_tx_hdrs(struct isert_conn *isert_conn,
939 struct iser_tx_desc *tx_desc)
940{
941 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
942 u64 dma_addr;
943
944 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
945 ISER_HEADERS_LEN, DMA_TO_DEVICE);
946 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
947 pr_err("ib_dma_mapping_error() failed\n");
948 return -ENOMEM;
949 }
950
951 tx_desc->dma_addr = dma_addr;
952 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
953 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
954 tx_desc->tx_sg[0].lkey = isert_conn->conn_mr->lkey;
955
956 pr_debug("isert_init_tx_hdrs: Setup tx_sg[0].addr: 0x%llx length: %u"
957 " lkey: 0x%08x\n", tx_desc->tx_sg[0].addr,
958 tx_desc->tx_sg[0].length, tx_desc->tx_sg[0].lkey);
959
960 return 0;
961}
962
963static void
95b60f07
NB		 964isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
965 struct ib_send_wr *send_wr, bool coalesce)
b8d26b3b 966{
95b60f07
NB		 967 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
968
b8d26b3b
NB		 969 isert_cmd->rdma_wr.iser_ib_op = ISER_IB_SEND;
970 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
971 send_wr->opcode = IB_WR_SEND;
95b60f07 972 send_wr->sg_list = &tx_desc->tx_sg[0];
b8d26b3b 973 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
95b60f07
NB		 974 /*
975 * Coalesce send completion interrupts by only setting IB_SEND_SIGNALED
976 * bit for every ISERT_COMP_BATCH_COUNT number of ib_post_send() calls.
977 */
ebbe4421
NB		 978 mutex_lock(&isert_conn->conn_mutex);
979 if (coalesce && isert_conn->state == ISER_CONN_UP &&
95b60f07 980 ++isert_conn->conn_comp_batch < ISERT_COMP_BATCH_COUNT) {
ebbe4421 981 tx_desc->llnode_active = true;
95b60f07 982 llist_add(&tx_desc->comp_llnode, &isert_conn->conn_comp_llist);
ebbe4421 983 mutex_unlock(&isert_conn->conn_mutex);
95b60f07
NB		 984 return;
985 }
986 isert_conn->conn_comp_batch = 0;
987 tx_desc->comp_llnode_batch = llist_del_all(&isert_conn->conn_comp_llist);
ebbe4421 988 mutex_unlock(&isert_conn->conn_mutex);
95b60f07
NB		 989
990 send_wr->send_flags = IB_SEND_SIGNALED;
b8d26b3b
NB		 991}
992
993static int
994isert_rdma_post_recvl(struct isert_conn *isert_conn)
995{
996 struct ib_recv_wr rx_wr, *rx_wr_fail;
997 struct ib_sge sge;
998 int ret;
999
1000 memset(&sge, 0, sizeof(struct ib_sge));
1001 sge.addr = isert_conn->login_req_dma;
1002 sge.length = ISER_RX_LOGIN_SIZE;
1003 sge.lkey = isert_conn->conn_mr->lkey;
1004
1005 pr_debug("Setup sge: addr: %llx length: %d 0x%08x\n",
1006 sge.addr, sge.length, sge.lkey);
1007
1008 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
1009 rx_wr.wr_id = (unsigned long)isert_conn->login_req_buf;
1010 rx_wr.sg_list = &sge;
1011 rx_wr.num_sge = 1;
1012
1013 isert_conn->post_recv_buf_count++;
1014 ret = ib_post_recv(isert_conn->conn_qp, &rx_wr, &rx_wr_fail);
1015 if (ret) {
1016 pr_err("ib_post_recv() failed: %d\n", ret);
1017 isert_conn->post_recv_buf_count--;
1018 }
1019
1020 pr_debug("ib_post_recv(): returned success >>>>>>>>>>>>>>>>>>>>>>>>\n");
1021 return ret;
1022}
1023
1024static int
1025isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1026 u32 length)
1027{
1028 struct isert_conn *isert_conn = conn->context;
1029 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1030 struct iser_tx_desc *tx_desc = &isert_conn->conn_login_tx_desc;
1031 int ret;
1032
1033 isert_create_send_desc(isert_conn, NULL, tx_desc);
1034
1035 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
1036 sizeof(struct iscsi_hdr));
1037
1038 isert_init_tx_hdrs(isert_conn, tx_desc);
1039
1040 if (length > 0) {
1041 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
1042
1043 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
1044 length, DMA_TO_DEVICE);
1045
1046 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
1047
1048 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1049 length, DMA_TO_DEVICE);
1050
1051 tx_dsg->addr = isert_conn->login_rsp_dma;
1052 tx_dsg->length = length;
1053 tx_dsg->lkey = isert_conn->conn_mr->lkey;
1054 tx_desc->num_sge = 2;
1055 }
1056 if (!login->login_failed) {
1057 if (login->login_complete) {
e0546fc1
SG		 1058 if (!conn->sess->sess_ops->SessionType &&
1059 isert_conn->conn_device->use_fastreg) {
1060 /* Normal Session and fastreg is used */
f46d6a8a
NB		 1061 u8 pi_support = login->np->tpg_np->tpg->tpg_attrib.t10_pi;
1062
1063 ret = isert_conn_create_fastreg_pool(isert_conn,
1064 pi_support);
1065 if (ret) {
1066 pr_err("Conn: %p failed to create"
1067 " fastreg pool\n", isert_conn);
1068 return ret;
1069 }
1070 }
1071
b8d26b3b
NB		 1072 ret = isert_alloc_rx_descriptors(isert_conn);
1073 if (ret)
1074 return ret;
1075
1076 ret = isert_post_recv(isert_conn, ISERT_MIN_POSTED_RX);
1077 if (ret)
1078 return ret;
1079
1080 isert_conn->state = ISER_CONN_UP;
1081 goto post_send;
1082 }
1083
1084 ret = isert_rdma_post_recvl(isert_conn);
1085 if (ret)
1086 return ret;
1087 }
1088post_send:
1089 ret = isert_post_send(isert_conn, tx_desc);
1090 if (ret)
1091 return ret;
1092
1093 return 0;
1094}
1095
1096static void
1097isert_rx_login_req(struct iser_rx_desc *rx_desc, int rx_buflen,
1098 struct isert_conn *isert_conn)
1099{
1100 struct iscsi_conn *conn = isert_conn->conn;
1101 struct iscsi_login *login = conn->conn_login;
1102 int size;
1103
1104 if (!login) {
1105 pr_err("conn->conn_login is NULL\n");
1106 dump_stack();
1107 return;
1108 }
1109
1110 if (login->first_request) {
1111 struct iscsi_login_req *login_req =
1112 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1113 /*
1114 * Setup the initial iscsi_login values from the leading
1115 * login request PDU.
1116 */
1117 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1118 login->current_stage =
1119 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1120 >> 2;
1121 login->version_min = login_req->min_version;
1122 login->version_max = login_req->max_version;
1123 memcpy(login->isid, login_req->isid, 6);
1124 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1125 login->init_task_tag = login_req->itt;
1126 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1127 login->cid = be16_to_cpu(login_req->cid);
1128 login->tsih = be16_to_cpu(login_req->tsih);
1129 }
1130
1131 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1132
1133 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1134 pr_debug("Using login payload size: %d, rx_buflen: %d MAX_KEY_VALUE_PAIRS: %d\n",
1135 size, rx_buflen, MAX_KEY_VALUE_PAIRS);
1136 memcpy(login->req_buf, &rx_desc->data[0], size);
1137
6faaa85f
NB		 1138 if (login->first_request) {
1139 complete(&isert_conn->conn_login_comp);
1140 return;
1141 }
1142 schedule_delayed_work(&conn->login_work, 0);
b8d26b3b
NB		 1143}
1144
b8d26b3b 1145static struct iscsi_cmd
676687c6 1146*isert_allocate_cmd(struct iscsi_conn *conn)
b8d26b3b
NB		 1147{
1148 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
1149 struct isert_cmd *isert_cmd;
d703ce2f 1150 struct iscsi_cmd *cmd;
b8d26b3b 1151
676687c6 1152 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
d703ce2f
NB		 1153 if (!cmd) {
1154 pr_err("Unable to allocate iscsi_cmd + isert_cmd\n");
b8d26b3b
NB		 1155 return NULL;
1156 }
d703ce2f 1157 isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b 1158 isert_cmd->conn = isert_conn;
d703ce2f 1159 isert_cmd->iscsi_cmd = cmd;
b8d26b3b 1160
d703ce2f 1161 return cmd;
b8d26b3b
NB		 1162}
1163
1164static int
1165isert_handle_scsi_cmd(struct isert_conn *isert_conn,
d703ce2f
NB		 1166 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1167 struct iser_rx_desc *rx_desc, unsigned char *buf)
b8d26b3b 1168{
b8d26b3b
NB		 1169 struct iscsi_conn *conn = isert_conn->conn;
1170 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1171 struct scatterlist *sg;
1172 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1173 bool dump_payload = false;
1174
1175 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1176 if (rc < 0)
1177 return rc;
1178
1179 imm_data = cmd->immediate_data;
1180 imm_data_len = cmd->first_burst_len;
1181 unsol_data = cmd->unsolicited_data;
1182
1183 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1184 if (rc < 0) {
1185 return 0;
1186 } else if (rc > 0) {
1187 dump_payload = true;
1188 goto sequence_cmd;
1189 }
1190
1191 if (!imm_data)
1192 return 0;
1193
1194 sg = &cmd->se_cmd.t_data_sg[0];
1195 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1196
1197 pr_debug("Copying Immediate SG: %p sg_nents: %u from %p imm_data_len: %d\n",
1198 sg, sg_nents, &rx_desc->data[0], imm_data_len);
1199
1200 sg_copy_from_buffer(sg, sg_nents, &rx_desc->data[0], imm_data_len);
1201
1202 cmd->write_data_done += imm_data_len;
1203
1204 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1205 spin_lock_bh(&cmd->istate_lock);
1206 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1207 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1208 spin_unlock_bh(&cmd->istate_lock);
1209 }
1210
1211sequence_cmd:
561bf158 1212 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
b8d26b3b
NB		 1213
1214 if (!rc && dump_payload == false && unsol_data)
1215 iscsit_set_unsoliticed_dataout(cmd);
6cc44a6f
NB		 1216 else if (dump_payload && imm_data)
1217 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
b8d26b3b 1218
b8d26b3b
NB		 1219 return 0;
1220}
1221
1222static int
1223isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1224 struct iser_rx_desc *rx_desc, unsigned char *buf)
1225{
1226 struct scatterlist *sg_start;
1227 struct iscsi_conn *conn = isert_conn->conn;
1228 struct iscsi_cmd *cmd = NULL;
1229 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1230 u32 unsol_data_len = ntoh24(hdr->dlength);
1231 int rc, sg_nents, sg_off, page_off;
1232
1233 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1234 if (rc < 0)
1235 return rc;
1236 else if (!cmd)
1237 return 0;
1238 /*
1239 * FIXME: Unexpected unsolicited_data out
1240 */
1241 if (!cmd->unsolicited_data) {
1242 pr_err("Received unexpected solicited data payload\n");
1243 dump_stack();
1244 return -1;
1245 }
1246
1247 pr_debug("Unsolicited DataOut unsol_data_len: %u, write_data_done: %u, data_length: %u\n",
1248 unsol_data_len, cmd->write_data_done, cmd->se_cmd.data_length);
1249
1250 sg_off = cmd->write_data_done / PAGE_SIZE;
1251 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1252 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1253 page_off = cmd->write_data_done % PAGE_SIZE;
1254 /*
1255 * FIXME: Non page-aligned unsolicited_data out
1256 */
1257 if (page_off) {
1258 pr_err("Received unexpected non-page aligned data payload\n");
1259 dump_stack();
1260 return -1;
1261 }
1262 pr_debug("Copying DataOut: sg_start: %p, sg_off: %u sg_nents: %u from %p %u\n",
1263 sg_start, sg_off, sg_nents, &rx_desc->data[0], unsol_data_len);
1264
1265 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1266 unsol_data_len);
1267
1268 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1269 if (rc < 0)
1270 return rc;
1271
1272 return 0;
1273}
1274
778de368
NB		 1275static int
1276isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
d703ce2f
NB		 1277 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1278 unsigned char *buf)
778de368 1279{
778de368
NB		 1280 struct iscsi_conn *conn = isert_conn->conn;
1281 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1282 int rc;
1283
1284 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1285 if (rc < 0)
1286 return rc;
1287 /*
1288 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1289 */
1290
1291 return iscsit_process_nop_out(conn, cmd, hdr);
1292}
1293
adb54c29
NB		 1294static int
1295isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
d703ce2f
NB		 1296 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1297 struct iscsi_text *hdr)
adb54c29 1298{
adb54c29
NB		 1299 struct iscsi_conn *conn = isert_conn->conn;
1300 u32 payload_length = ntoh24(hdr->dlength);
1301 int rc;
1302 unsigned char *text_in;
1303
1304 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1305 if (rc < 0)
1306 return rc;
1307
1308 text_in = kzalloc(payload_length, GFP_KERNEL);
1309 if (!text_in) {
1310 pr_err("Unable to allocate text_in of payload_length: %u\n",
1311 payload_length);
1312 return -ENOMEM;
1313 }
1314 cmd->text_in_ptr = text_in;
1315
1316 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1317
1318 return iscsit_process_text_cmd(conn, cmd, hdr);
1319}
1320
b8d26b3b
NB		 1321static int
1322isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1323 uint32_t read_stag, uint64_t read_va,
1324 uint32_t write_stag, uint64_t write_va)
1325{
1326 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1327 struct iscsi_conn *conn = isert_conn->conn;
ca40d24e 1328 struct iscsi_session *sess = conn->sess;
b8d26b3b
NB		 1329 struct iscsi_cmd *cmd;
1330 struct isert_cmd *isert_cmd;
1331 int ret = -EINVAL;
1332 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1333
ca40d24e
NB		 1334 if (sess->sess_ops->SessionType &&
1335 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1336 pr_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1337 " ignoring\n", opcode);
1338 return 0;
1339 }
1340
b8d26b3b
NB		 1341 switch (opcode) {
1342 case ISCSI_OP_SCSI_CMD:
676687c6 1343 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1344 if (!cmd)
1345 break;
1346
d703ce2f 1347 isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 1348 isert_cmd->read_stag = read_stag;
1349 isert_cmd->read_va = read_va;
1350 isert_cmd->write_stag = write_stag;
1351 isert_cmd->write_va = write_va;
1352
d703ce2f 1353 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
b8d26b3b
NB		 1354 rx_desc, (unsigned char *)hdr);
1355 break;
1356 case ISCSI_OP_NOOP_OUT:
676687c6 1357 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1358 if (!cmd)
1359 break;
1360
d703ce2f
NB		 1361 isert_cmd = iscsit_priv_cmd(cmd);
1362 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
778de368 1363 rx_desc, (unsigned char *)hdr);
b8d26b3b
NB		 1364 break;
1365 case ISCSI_OP_SCSI_DATA_OUT:
1366 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1367 (unsigned char *)hdr);
1368 break;
1369 case ISCSI_OP_SCSI_TMFUNC:
676687c6 1370 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1371 if (!cmd)
1372 break;
1373
1374 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1375 (unsigned char *)hdr);
1376 break;
1377 case ISCSI_OP_LOGOUT:
676687c6 1378 cmd = isert_allocate_cmd(conn);
b8d26b3b
NB		 1379 if (!cmd)
1380 break;
1381
1382 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1383 if (ret > 0)
1384 wait_for_completion_timeout(&conn->conn_logout_comp,
1385 SECONDS_FOR_LOGOUT_COMP *
1386 HZ);
1387 break;
adb54c29 1388 case ISCSI_OP_TEXT:
676687c6 1389 cmd = isert_allocate_cmd(conn);
adb54c29
NB		 1390 if (!cmd)
1391 break;
1392
d703ce2f
NB		 1393 isert_cmd = iscsit_priv_cmd(cmd);
1394 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
adb54c29
NB		 1395 rx_desc, (struct iscsi_text *)hdr);
1396 break;
b8d26b3b
NB		 1397 default:
1398 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1399 dump_stack();
1400 break;
1401 }
1402
1403 return ret;
1404}
1405
1406static void
1407isert_rx_do_work(struct iser_rx_desc *rx_desc, struct isert_conn *isert_conn)
1408{
1409 struct iser_hdr *iser_hdr = &rx_desc->iser_header;
1410 uint64_t read_va = 0, write_va = 0;
1411 uint32_t read_stag = 0, write_stag = 0;
1412 int rc;
1413
1414 switch (iser_hdr->flags & 0xF0) {
1415 case ISCSI_CTRL:
1416 if (iser_hdr->flags & ISER_RSV) {
1417 read_stag = be32_to_cpu(iser_hdr->read_stag);
1418 read_va = be64_to_cpu(iser_hdr->read_va);
1419 pr_debug("ISER_RSV: read_stag: 0x%08x read_va: 0x%16llx\n",
1420 read_stag, (unsigned long long)read_va);
1421 }
1422 if (iser_hdr->flags & ISER_WSV) {
1423 write_stag = be32_to_cpu(iser_hdr->write_stag);
1424 write_va = be64_to_cpu(iser_hdr->write_va);
1425 pr_debug("ISER_WSV: write__stag: 0x%08x write_va: 0x%16llx\n",
1426 write_stag, (unsigned long long)write_va);
1427 }
1428
1429 pr_debug("ISER ISCSI_CTRL PDU\n");
1430 break;
1431 case ISER_HELLO:
1432 pr_err("iSER Hello message\n");
1433 break;
1434 default:
1435 pr_warn("Unknown iSER hdr flags: 0x%02x\n", iser_hdr->flags);
1436 break;
1437 }
1438
1439 rc = isert_rx_opcode(isert_conn, rx_desc,
1440 read_stag, read_va, write_stag, write_va);
1441}
1442
1443static void
1444isert_rx_completion(struct iser_rx_desc *desc, struct isert_conn *isert_conn,
1445 unsigned long xfer_len)
1446{
1447 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1448 struct iscsi_hdr *hdr;
1449 u64 rx_dma;
1450 int rx_buflen, outstanding;
1451
1452 if ((char *)desc == isert_conn->login_req_buf) {
1453 rx_dma = isert_conn->login_req_dma;
1454 rx_buflen = ISER_RX_LOGIN_SIZE;
1455 pr_debug("ISER login_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1456 rx_dma, rx_buflen);
1457 } else {
1458 rx_dma = desc->dma_addr;
1459 rx_buflen = ISER_RX_PAYLOAD_SIZE;
1460 pr_debug("ISER req_buf: Using rx_dma: 0x%llx, rx_buflen: %d\n",
1461 rx_dma, rx_buflen);
1462 }
1463
1464 ib_dma_sync_single_for_cpu(ib_dev, rx_dma, rx_buflen, DMA_FROM_DEVICE);
1465
1466 hdr = &desc->iscsi_header;
1467 pr_debug("iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1468 hdr->opcode, hdr->itt, hdr->flags,
1469 (int)(xfer_len - ISER_HEADERS_LEN));
1470
1471 if ((char *)desc == isert_conn->login_req_buf)
1472 isert_rx_login_req(desc, xfer_len - ISER_HEADERS_LEN,
1473 isert_conn);
1474 else
1475 isert_rx_do_work(desc, isert_conn);
1476
1477 ib_dma_sync_single_for_device(ib_dev, rx_dma, rx_buflen,
1478 DMA_FROM_DEVICE);
1479
1480 isert_conn->post_recv_buf_count--;
1481 pr_debug("iSERT: Decremented post_recv_buf_count: %d\n",
1482 isert_conn->post_recv_buf_count);
1483
1484 if ((char *)desc == isert_conn->login_req_buf)
1485 return;
1486
1487 outstanding = isert_conn->post_recv_buf_count;
1488 if (outstanding + ISERT_MIN_POSTED_RX <= ISERT_QP_MAX_RECV_DTOS) {
1489 int err, count = min(ISERT_QP_MAX_RECV_DTOS - outstanding,
1490 ISERT_MIN_POSTED_RX);
1491 err = isert_post_recv(isert_conn, count);
1492 if (err) {
1493 pr_err("isert_post_recv() count: %d failed, %d\n",
1494 count, err);
1495 }
1496 }
1497}
1498
e3d7e4c3
SG		 1499static int
1500isert_map_data_buf(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1501 struct scatterlist *sg, u32 nents, u32 length, u32 offset,
1502 enum iser_ib_op_code op, struct isert_data_buf *data)
1503{
1504 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1505
1506 data->dma_dir = op == ISER_IB_RDMA_WRITE ?
1507 DMA_TO_DEVICE : DMA_FROM_DEVICE;
1508
1509 data->len = length - offset;
1510 data->offset = offset;
1511 data->sg_off = data->offset / PAGE_SIZE;
1512
1513 data->sg = &sg[data->sg_off];
1514 data->nents = min_t(unsigned int, nents - data->sg_off,
1515 ISCSI_ISER_SG_TABLESIZE);
1516 data->len = min_t(unsigned int, data->len, ISCSI_ISER_SG_TABLESIZE *
1517 PAGE_SIZE);
1518
1519 data->dma_nents = ib_dma_map_sg(ib_dev, data->sg, data->nents,
1520 data->dma_dir);
1521 if (unlikely(!data->dma_nents)) {
1522 pr_err("Cmd: unable to dma map SGs %p\n", sg);
1523 return -EINVAL;
1524 }
1525
1526 pr_debug("Mapped cmd: %p count: %u sg: %p sg_nents: %u rdma_len %d\n",
1527 isert_cmd, data->dma_nents, data->sg, data->nents, data->len);
1528
1529 return 0;
1530}
1531
1532static void
1533isert_unmap_data_buf(struct isert_conn *isert_conn, struct isert_data_buf *data)
1534{
1535 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1536
1537 ib_dma_unmap_sg(ib_dev, data->sg, data->nents, data->dma_dir);
1538 memset(data, 0, sizeof(*data));
1539}
1540
1541
1542
b8d26b3b
NB		 1543static void
1544isert_unmap_cmd(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
1545{
1546 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
b8d26b3b 1547
90ecc6e2 1548 pr_debug("isert_unmap_cmd: %p\n", isert_cmd);
e3d7e4c3
SG		 1549
1550 if (wr->data.sg) {
90ecc6e2 1551 pr_debug("isert_unmap_cmd: %p unmap_sg op\n", isert_cmd);
e3d7e4c3 1552 isert_unmap_data_buf(isert_conn, &wr->data);
b8d26b3b
NB		 1553 }
1554
90ecc6e2
VP		 1555 if (wr->send_wr) {
1556 pr_debug("isert_unmap_cmd: %p free send_wr\n", isert_cmd);
1557 kfree(wr->send_wr);
1558 wr->send_wr = NULL;
1559 }
b8d26b3b 1560
90ecc6e2
VP		 1561 if (wr->ib_sge) {
1562 pr_debug("isert_unmap_cmd: %p free ib_sge\n", isert_cmd);
1563 kfree(wr->ib_sge);
1564 wr->ib_sge = NULL;
1565 }
b8d26b3b
NB		 1566}
1567
59464ef4 1568static void
a3a5a826 1569isert_unreg_rdma(struct isert_cmd *isert_cmd, struct isert_conn *isert_conn)
59464ef4
VP		 1570{
1571 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
59464ef4
VP		 1572 LIST_HEAD(unmap_list);
1573
a3a5a826 1574 pr_debug("unreg_fastreg_cmd: %p\n", isert_cmd);
59464ef4
VP		 1575
1576 if (wr->fr_desc) {
a3a5a826 1577 pr_debug("unreg_fastreg_cmd: %p free fr_desc %p\n",
59464ef4 1578 isert_cmd, wr->fr_desc);
9e961ae7
SG		 1579 if (wr->fr_desc->ind & ISERT_PROTECTED) {
1580 isert_unmap_data_buf(isert_conn, &wr->prot);
1581 wr->fr_desc->ind &= ~ISERT_PROTECTED;
1582 }
59464ef4 1583 spin_lock_bh(&isert_conn->conn_lock);
a3a5a826 1584 list_add_tail(&wr->fr_desc->list, &isert_conn->conn_fr_pool);
59464ef4
VP		 1585 spin_unlock_bh(&isert_conn->conn_lock);
1586 wr->fr_desc = NULL;
1587 }
1588
e3d7e4c3 1589 if (wr->data.sg) {
a3a5a826 1590 pr_debug("unreg_fastreg_cmd: %p unmap_sg op\n", isert_cmd);
e3d7e4c3 1591 isert_unmap_data_buf(isert_conn, &wr->data);
59464ef4
VP		 1592 }
1593
1594 wr->ib_sge = NULL;
1595 wr->send_wr = NULL;
1596}
1597
b8d26b3b 1598static void
03e7848a 1599isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
b8d26b3b 1600{
d703ce2f 1601 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b 1602 struct isert_conn *isert_conn = isert_cmd->conn;
186a9647 1603 struct iscsi_conn *conn = isert_conn->conn;
d40945d8 1604 struct isert_device *device = isert_conn->conn_device;
b8d26b3b
NB		 1605
1606 pr_debug("Entering isert_put_cmd: %p\n", isert_cmd);
1607
1608 switch (cmd->iscsi_opcode) {
1609 case ISCSI_OP_SCSI_CMD:
b8d26b3b
NB		 1610 spin_lock_bh(&conn->cmd_lock);
1611 if (!list_empty(&cmd->i_conn_node))
5159d763 1612 list_del_init(&cmd->i_conn_node);
b8d26b3b
NB		 1613 spin_unlock_bh(&conn->cmd_lock);
1614
03e7848a 1615 if (cmd->data_direction == DMA_TO_DEVICE) {
b8d26b3b 1616 iscsit_stop_dataout_timer(cmd);
03e7848a
NB		 1617 /*
1618 * Check for special case during comp_err where
1619 * WRITE_PENDING has been handed off from core,
1620 * but requires an extra target_put_sess_cmd()
1621 * before transport_generic_free_cmd() below.
1622 */
1623 if (comp_err &&
1624 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1625 struct se_cmd *se_cmd = &cmd->se_cmd;
1626
1627 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
1628 }
1629 }
b8d26b3b 1630
d40945d8 1631 device->unreg_rdma_mem(isert_cmd, isert_conn);
186a9647
NB		 1632 transport_generic_free_cmd(&cmd->se_cmd, 0);
1633 break;
b8d26b3b 1634 case ISCSI_OP_SCSI_TMFUNC:
186a9647
NB		 1635 spin_lock_bh(&conn->cmd_lock);
1636 if (!list_empty(&cmd->i_conn_node))
5159d763 1637 list_del_init(&cmd->i_conn_node);
186a9647
NB		 1638 spin_unlock_bh(&conn->cmd_lock);
1639
b8d26b3b
NB		 1640 transport_generic_free_cmd(&cmd->se_cmd, 0);
1641 break;
1642 case ISCSI_OP_REJECT:
1643 case ISCSI_OP_NOOP_OUT:
adb54c29 1644 case ISCSI_OP_TEXT:
b8d26b3b
NB		 1645 spin_lock_bh(&conn->cmd_lock);
1646 if (!list_empty(&cmd->i_conn_node))
5159d763 1647 list_del_init(&cmd->i_conn_node);
b8d26b3b
NB		 1648 spin_unlock_bh(&conn->cmd_lock);
1649
1650 /*
1651 * Handle special case for REJECT when iscsi_add_reject*() has
1652 * overwritten the original iscsi_opcode assignment, and the
1653 * associated cmd->se_cmd needs to be released.
1654 */
1655 if (cmd->se_cmd.se_tfo != NULL) {
3df8f68a
NB		 1656 pr_debug("Calling transport_generic_free_cmd from"
1657 " isert_put_cmd for 0x%02x\n",
1658 cmd->iscsi_opcode);
b8d26b3b
NB		 1659 transport_generic_free_cmd(&cmd->se_cmd, 0);
1660 break;
1661 }
1662 /*
1663 * Fall-through
1664 */
1665 default:
d703ce2f 1666 iscsit_release_cmd(cmd);
b8d26b3b
NB		 1667 break;
1668 }
1669}
1670
1671static void
1672isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1673{
1674 if (tx_desc->dma_addr != 0) {
1675 pr_debug("Calling ib_dma_unmap_single for tx_desc->dma_addr\n");
1676 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1677 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1678 tx_desc->dma_addr = 0;
1679 }
1680}
1681
1682static void
1683isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
03e7848a 1684 struct ib_device *ib_dev, bool comp_err)
b8d26b3b 1685{
dbbc5d11
NB		 1686 if (isert_cmd->pdu_buf_dma != 0) {
1687 pr_debug("Calling ib_dma_unmap_single for isert_cmd->pdu_buf_dma\n");
1688 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1689 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1690 isert_cmd->pdu_buf_dma = 0;
b8d26b3b
NB		 1691 }
1692
1693 isert_unmap_tx_desc(tx_desc, ib_dev);
03e7848a 1694 isert_put_cmd(isert_cmd, comp_err);
b8d26b3b
NB		 1695}
1696
96b7973e
SG		 1697static int
1698isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1699{
1700 struct ib_mr_status mr_status;
1701 int ret;
1702
1703 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1704 if (ret) {
1705 pr_err("ib_check_mr_status failed, ret %d\n", ret);
1706 goto fail_mr_status;
1707 }
1708
1709 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1710 u64 sec_offset_err;
1711 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1712
1713 switch (mr_status.sig_err.err_type) {
1714 case IB_SIG_BAD_GUARD:
1715 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1716 break;
1717 case IB_SIG_BAD_REFTAG:
1718 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1719 break;
1720 case IB_SIG_BAD_APPTAG:
1721 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1722 break;
1723 }
1724 sec_offset_err = mr_status.sig_err.sig_err_offset;
1725 do_div(sec_offset_err, block_size);
1726 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1727
1728 pr_err("isert: PI error found type %d at sector 0x%llx "
1729 "expected 0x%x vs actual 0x%x\n",
1730 mr_status.sig_err.err_type,
1731 (unsigned long long)se_cmd->bad_sector,
1732 mr_status.sig_err.expected,
1733 mr_status.sig_err.actual);
1734 ret = 1;
1735 }
1736
1737fail_mr_status:
1738 return ret;
1739}
1740
f93f3a70
SG		 1741static void
1742isert_completion_rdma_write(struct iser_tx_desc *tx_desc,
1743 struct isert_cmd *isert_cmd)
1744{
9e961ae7 1745 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
f93f3a70 1746 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
9e961ae7 1747 struct se_cmd *se_cmd = &cmd->se_cmd;
f93f3a70
SG		 1748 struct isert_conn *isert_conn = isert_cmd->conn;
1749 struct isert_device *device = isert_conn->conn_device;
9e961ae7
SG		 1750 int ret = 0;
1751
1752 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
96b7973e
SG		 1753 ret = isert_check_pi_status(se_cmd,
1754 wr->fr_desc->pi_ctx->sig_mr);
1755 wr->fr_desc->ind &= ~ISERT_PROTECTED;
9e961ae7 1756 }
f93f3a70
SG		 1757
1758 device->unreg_rdma_mem(isert_cmd, isert_conn);
897bb2c9 1759 wr->send_wr_num = 0;
9e961ae7
SG		 1760 if (ret)
1761 transport_send_check_condition_and_sense(se_cmd,
1762 se_cmd->pi_err, 0);
1763 else
1764 isert_put_response(isert_conn->conn, cmd);
f93f3a70
SG		 1765}
1766
b8d26b3b
NB		 1767static void
1768isert_completion_rdma_read(struct iser_tx_desc *tx_desc,
1769 struct isert_cmd *isert_cmd)
1770{
1771 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
d703ce2f 1772 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b 1773 struct se_cmd *se_cmd = &cmd->se_cmd;
90ecc6e2 1774 struct isert_conn *isert_conn = isert_cmd->conn;
d40945d8 1775 struct isert_device *device = isert_conn->conn_device;
5bac4b1a 1776 int ret = 0;
b8d26b3b 1777
9e961ae7 1778 if (wr->fr_desc && wr->fr_desc->ind & ISERT_PROTECTED) {
96b7973e
SG		 1779 ret = isert_check_pi_status(se_cmd,
1780 wr->fr_desc->pi_ctx->sig_mr);
1781 wr->fr_desc->ind &= ~ISERT_PROTECTED;
9e961ae7
SG		 1782 }
1783
b8d26b3b 1784 iscsit_stop_dataout_timer(cmd);
d40945d8 1785 device->unreg_rdma_mem(isert_cmd, isert_conn);
e3d7e4c3 1786 cmd->write_data_done = wr->data.len;
b6b87a1d 1787 wr->send_wr_num = 0;
b8d26b3b 1788
90ecc6e2 1789 pr_debug("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
b8d26b3b
NB		 1790 spin_lock_bh(&cmd->istate_lock);
1791 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1792 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1793 spin_unlock_bh(&cmd->istate_lock);
1794
5bac4b1a
SG		 1795 if (ret)
1796 transport_send_check_condition_and_sense(se_cmd,
1797 se_cmd->pi_err, 0);
1798 else
1799 target_execute_cmd(se_cmd);
b8d26b3b
NB		 1800}
1801
1802static void
1803isert_do_control_comp(struct work_struct *work)
1804{
1805 struct isert_cmd *isert_cmd = container_of(work,
1806 struct isert_cmd, comp_work);
1807 struct isert_conn *isert_conn = isert_cmd->conn;
1808 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
d703ce2f 1809 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b
NB		 1810
1811 switch (cmd->i_state) {
1812 case ISTATE_SEND_TASKMGTRSP:
1813 pr_debug("Calling iscsit_tmr_post_handler >>>>>>>>>>>>>>>>>\n");
1814
1815 atomic_dec(&isert_conn->post_send_buf_count);
1816 iscsit_tmr_post_handler(cmd, cmd->conn);
1817
1818 cmd->i_state = ISTATE_SENT_STATUS;
03e7848a 1819 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
b8d26b3b
NB		 1820 break;
1821 case ISTATE_SEND_REJECT:
1822 pr_debug("Got isert_do_control_comp ISTATE_SEND_REJECT: >>>\n");
1823 atomic_dec(&isert_conn->post_send_buf_count);
1824
1825 cmd->i_state = ISTATE_SENT_STATUS;
03e7848a 1826 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
3df8f68a 1827 break;
b8d26b3b
NB		 1828 case ISTATE_SEND_LOGOUTRSP:
1829 pr_debug("Calling iscsit_logout_post_handler >>>>>>>>>>>>>>\n");
9d49f5e2
SG		 1830
1831 atomic_dec(&isert_conn->post_send_buf_count);
b8d26b3b
NB		 1832 iscsit_logout_post_handler(cmd, cmd->conn);
1833 break;
adb54c29
NB		 1834 case ISTATE_SEND_TEXTRSP:
1835 atomic_dec(&isert_conn->post_send_buf_count);
1836 cmd->i_state = ISTATE_SENT_STATUS;
03e7848a 1837 isert_completion_put(&isert_cmd->tx_desc, isert_cmd, ib_dev, false);
adb54c29 1838 break;
b8d26b3b
NB		 1839 default:
1840 pr_err("Unknown do_control_comp i_state %d\n", cmd->i_state);
1841 dump_stack();
1842 break;
1843 }
1844}
1845
1846static void
1847isert_response_completion(struct iser_tx_desc *tx_desc,
1848 struct isert_cmd *isert_cmd,
1849 struct isert_conn *isert_conn,
1850 struct ib_device *ib_dev)
1851{
d703ce2f 1852 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b6b87a1d 1853 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
b8d26b3b
NB		 1854
1855 if (cmd->i_state == ISTATE_SEND_TASKMGTRSP ||
3df8f68a 1856 cmd->i_state == ISTATE_SEND_LOGOUTRSP ||
adb54c29
NB		 1857 cmd->i_state == ISTATE_SEND_REJECT ||
1858 cmd->i_state == ISTATE_SEND_TEXTRSP) {
b8d26b3b
NB		 1859 isert_unmap_tx_desc(tx_desc, ib_dev);
1860
1861 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1862 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1863 return;
1864 }
897bb2c9
SG		 1865
1866 /**
1867 * If send_wr_num is 0 this means that we got
1868 * RDMA completion and we cleared it and we should
1869 * simply decrement the response post. else the
1870 * response is incorporated in send_wr_num, just
1871 * sub it.
1872 **/
1873 if (wr->send_wr_num)
1874 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
1875 else
1876 atomic_dec(&isert_conn->post_send_buf_count);
b8d26b3b
NB		 1877
1878 cmd->i_state = ISTATE_SENT_STATUS;
03e7848a 1879 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
b8d26b3b
NB		 1880}
1881
1882static void
95b60f07
NB		 1883__isert_send_completion(struct iser_tx_desc *tx_desc,
1884 struct isert_conn *isert_conn)
b8d26b3b
NB		 1885{
1886 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
1887 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
1888 struct isert_rdma_wr *wr;
1889
1890 if (!isert_cmd) {
1891 atomic_dec(&isert_conn->post_send_buf_count);
1892 isert_unmap_tx_desc(tx_desc, ib_dev);
1893 return;
1894 }
1895 wr = &isert_cmd->rdma_wr;
1896
1897 switch (wr->iser_ib_op) {
1898 case ISER_IB_RECV:
1899 pr_err("isert_send_completion: Got ISER_IB_RECV\n");
1900 dump_stack();
1901 break;
1902 case ISER_IB_SEND:
1903 pr_debug("isert_send_completion: Got ISER_IB_SEND\n");
1904 isert_response_completion(tx_desc, isert_cmd,
1905 isert_conn, ib_dev);
1906 break;
1907 case ISER_IB_RDMA_WRITE:
f93f3a70 1908 pr_debug("isert_send_completion: Got ISER_IB_RDMA_WRITE\n");
897bb2c9 1909 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
f93f3a70 1910 isert_completion_rdma_write(tx_desc, isert_cmd);
b8d26b3b
NB		 1911 break;
1912 case ISER_IB_RDMA_READ:
1913 pr_debug("isert_send_completion: Got ISER_IB_RDMA_READ:\n");
1914
b6b87a1d 1915 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 1916 isert_completion_rdma_read(tx_desc, isert_cmd);
1917 break;
1918 default:
1919 pr_err("Unknown wr->iser_ib_op: 0x%02x\n", wr->iser_ib_op);
1920 dump_stack();
1921 break;
1922 }
1923}
1924
95b60f07
NB		 1925static void
1926isert_send_completion(struct iser_tx_desc *tx_desc,
1927 struct isert_conn *isert_conn)
1928{
1929 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1930 struct iser_tx_desc *t;
1931 /*
1932 * Drain coalesced completion llist starting from comp_llnode_batch
1933 * setup in isert_init_send_wr(), and then complete trailing tx_desc.
1934 */
1935 while (llnode) {
1936 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1937 llnode = llist_next(llnode);
1938 __isert_send_completion(t, isert_conn);
1939 }
1940 __isert_send_completion(tx_desc, isert_conn);
1941}
1942
ebbe4421
NB		 1943static void
1944isert_cq_drain_comp_llist(struct isert_conn *isert_conn, struct ib_device *ib_dev)
1945{
1946 struct llist_node *llnode;
1947 struct isert_rdma_wr *wr;
1948 struct iser_tx_desc *t;
1949
1950 mutex_lock(&isert_conn->conn_mutex);
1951 llnode = llist_del_all(&isert_conn->conn_comp_llist);
1952 isert_conn->conn_comp_batch = 0;
1953 mutex_unlock(&isert_conn->conn_mutex);
1954
1955 while (llnode) {
1956 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1957 llnode = llist_next(llnode);
1958 wr = &t->isert_cmd->rdma_wr;
1959
897bb2c9
SG		 1960 /**
1961 * If send_wr_num is 0 this means that we got
1962 * RDMA completion and we cleared it and we should
1963 * simply decrement the response post. else the
1964 * response is incorporated in send_wr_num, just
1965 * sub it.
1966 **/
1967 if (wr->send_wr_num)
1968 atomic_sub(wr->send_wr_num,
1969 &isert_conn->post_send_buf_count);
1970 else
1971 atomic_dec(&isert_conn->post_send_buf_count);
03e7848a
NB		 1972
1973 isert_completion_put(t, t->isert_cmd, ib_dev, true);
ebbe4421
NB		 1974 }
1975}
1976
b8d26b3b 1977static void
defd8848 1978isert_cq_tx_comp_err(struct iser_tx_desc *tx_desc, struct isert_conn *isert_conn)
b8d26b3b
NB		 1979{
1980 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
defd8848 1981 struct isert_cmd *isert_cmd = tx_desc->isert_cmd;
ebbe4421
NB		 1982 struct llist_node *llnode = tx_desc->comp_llnode_batch;
1983 struct isert_rdma_wr *wr;
1984 struct iser_tx_desc *t;
1985
1986 while (llnode) {
1987 t = llist_entry(llnode, struct iser_tx_desc, comp_llnode);
1988 llnode = llist_next(llnode);
1989 wr = &t->isert_cmd->rdma_wr;
1990
897bb2c9
SG		 1991 /**
1992 * If send_wr_num is 0 this means that we got
1993 * RDMA completion and we cleared it and we should
1994 * simply decrement the response post. else the
1995 * response is incorporated in send_wr_num, just
1996 * sub it.
1997 **/
1998 if (wr->send_wr_num)
1999 atomic_sub(wr->send_wr_num,
2000 &isert_conn->post_send_buf_count);
2001 else
2002 atomic_dec(&isert_conn->post_send_buf_count);
03e7848a
NB		 2003
2004 isert_completion_put(t, t->isert_cmd, ib_dev, true);
ebbe4421
NB		 2005 }
2006 tx_desc->comp_llnode_batch = NULL;
defd8848
NB		 2007
2008 if (!isert_cmd)
2009 isert_unmap_tx_desc(tx_desc, ib_dev);
2010 else
03e7848a 2011 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
defd8848
NB		 2012}
2013
2014static void
2015isert_cq_rx_comp_err(struct isert_conn *isert_conn)
2016{
2017 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2018 struct iscsi_conn *conn = isert_conn->conn;
b8d26b3b 2019
defd8848
NB		 2020 if (isert_conn->post_recv_buf_count)
2021 return;
b8d26b3b 2022
ebbe4421
NB		 2023 isert_cq_drain_comp_llist(isert_conn, ib_dev);
2024
defd8848
NB		 2025 if (conn->sess) {
2026 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2027 target_wait_for_sess_cmds(conn->sess->se_sess);
b8d26b3b
NB		 2028 }
2029
defd8848
NB		 2030 while (atomic_read(&isert_conn->post_send_buf_count))
2031 msleep(3000);
b8d26b3b 2032
defd8848
NB		 2033 mutex_lock(&isert_conn->conn_mutex);
2034 isert_conn->state = ISER_CONN_DOWN;
2035 mutex_unlock(&isert_conn->conn_mutex);
b2cb9649 2036
9d49f5e2
SG		 2037 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
2038
defd8848 2039 complete(&isert_conn->conn_wait_comp_err);
b8d26b3b
NB		 2040}
2041
2042static void
2043isert_cq_tx_work(struct work_struct *work)
2044{
2045 struct isert_cq_desc *cq_desc = container_of(work,
2046 struct isert_cq_desc, cq_tx_work);
2047 struct isert_device *device = cq_desc->device;
2048 int cq_index = cq_desc->cq_index;
2049 struct ib_cq *tx_cq = device->dev_tx_cq[cq_index];
2050 struct isert_conn *isert_conn;
2051 struct iser_tx_desc *tx_desc;
2052 struct ib_wc wc;
2053
2054 while (ib_poll_cq(tx_cq, 1, &wc) == 1) {
2055 tx_desc = (struct iser_tx_desc *)(unsigned long)wc.wr_id;
2056 isert_conn = wc.qp->qp_context;
2057
2058 if (wc.status == IB_WC_SUCCESS) {
2059 isert_send_completion(tx_desc, isert_conn);
2060 } else {
2061 pr_debug("TX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
2062 pr_debug("TX wc.status: 0x%08x\n", wc.status);
c5a2adbf 2063 pr_debug("TX wc.vendor_err: 0x%08x\n", wc.vendor_err);
defd8848 2064
9bb4ca68 2065 if (wc.wr_id != ISER_FASTREG_LI_WRID) {
ebbe4421
NB		 2066 if (tx_desc->llnode_active)
2067 continue;
2068
9bb4ca68
NB		 2069 atomic_dec(&isert_conn->post_send_buf_count);
2070 isert_cq_tx_comp_err(tx_desc, isert_conn);
2071 }
b8d26b3b
NB		 2072 }
2073 }
2074
2075 ib_req_notify_cq(tx_cq, IB_CQ_NEXT_COMP);
2076}
2077
2078static void
2079isert_cq_tx_callback(struct ib_cq *cq, void *context)
2080{
2081 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2082
b8d26b3b
NB		 2083 queue_work(isert_comp_wq, &cq_desc->cq_tx_work);
2084}
2085
2086static void
2087isert_cq_rx_work(struct work_struct *work)
2088{
2089 struct isert_cq_desc *cq_desc = container_of(work,
2090 struct isert_cq_desc, cq_rx_work);
2091 struct isert_device *device = cq_desc->device;
2092 int cq_index = cq_desc->cq_index;
2093 struct ib_cq *rx_cq = device->dev_rx_cq[cq_index];
2094 struct isert_conn *isert_conn;
2095 struct iser_rx_desc *rx_desc;
2096 struct ib_wc wc;
2097 unsigned long xfer_len;
2098
2099 while (ib_poll_cq(rx_cq, 1, &wc) == 1) {
2100 rx_desc = (struct iser_rx_desc *)(unsigned long)wc.wr_id;
2101 isert_conn = wc.qp->qp_context;
2102
2103 if (wc.status == IB_WC_SUCCESS) {
2104 xfer_len = (unsigned long)wc.byte_len;
2105 isert_rx_completion(rx_desc, isert_conn, xfer_len);
2106 } else {
2107 pr_debug("RX wc.status != IB_WC_SUCCESS >>>>>>>>>>>>>>\n");
c5a2adbf 2108 if (wc.status != IB_WC_WR_FLUSH_ERR) {
b8d26b3b 2109 pr_debug("RX wc.status: 0x%08x\n", wc.status);
c5a2adbf
NB		 2110 pr_debug("RX wc.vendor_err: 0x%08x\n",
2111 wc.vendor_err);
2112 }
b8d26b3b 2113 isert_conn->post_recv_buf_count--;
defd8848 2114 isert_cq_rx_comp_err(isert_conn);
b8d26b3b
NB		 2115 }
2116 }
2117
2118 ib_req_notify_cq(rx_cq, IB_CQ_NEXT_COMP);
2119}
2120
2121static void
2122isert_cq_rx_callback(struct ib_cq *cq, void *context)
2123{
2124 struct isert_cq_desc *cq_desc = (struct isert_cq_desc *)context;
2125
b8d26b3b
NB		 2126 queue_work(isert_rx_wq, &cq_desc->cq_rx_work);
2127}
2128
2129static int
2130isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
2131{
2132 struct ib_send_wr *wr_failed;
2133 int ret;
2134
2135 atomic_inc(&isert_conn->post_send_buf_count);
2136
2137 ret = ib_post_send(isert_conn->conn_qp, &isert_cmd->tx_desc.send_wr,
2138 &wr_failed);
2139 if (ret) {
2140 pr_err("ib_post_send failed with %d\n", ret);
2141 atomic_dec(&isert_conn->post_send_buf_count);
2142 return ret;
2143 }
2144 return ret;
2145}
2146
2147static int
2148isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2149{
d703ce2f 2150 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2151 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2152 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2153 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
2154 &isert_cmd->tx_desc.iscsi_header;
2155
2156 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2157 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
2158 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2159 /*
2160 * Attach SENSE DATA payload to iSCSI Response PDU
2161 */
2162 if (cmd->se_cmd.sense_buffer &&
2163 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
2164 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
2165 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2166 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
dbbc5d11 2167 u32 padding, pdu_len;
b8d26b3b
NB		 2168
2169 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
2170 cmd->sense_buffer);
2171 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
2172
2173 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
2174 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
dbbc5d11 2175 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
b8d26b3b 2176
dbbc5d11
NB		 2177 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2178 (void *)cmd->sense_buffer, pdu_len,
b8d26b3b
NB		 2179 DMA_TO_DEVICE);
2180
dbbc5d11
NB		 2181 isert_cmd->pdu_buf_len = pdu_len;
2182 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2183 tx_dsg->length = pdu_len;
b8d26b3b
NB		 2184 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2185 isert_cmd->tx_desc.num_sge = 2;
2186 }
2187
0d0f660d 2188 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 2189
2190 pr_debug("Posting SCSI Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2191
2192 return isert_post_response(isert_conn, isert_cmd);
2193}
2194
131e6abc
NB		 2195static void
2196isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2197{
2198 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2199 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2200 struct isert_device *device = isert_conn->conn_device;
2201
2202 spin_lock_bh(&conn->cmd_lock);
2203 if (!list_empty(&cmd->i_conn_node))
2204 list_del_init(&cmd->i_conn_node);
2205 spin_unlock_bh(&conn->cmd_lock);
2206
2207 if (cmd->data_direction == DMA_TO_DEVICE)
2208 iscsit_stop_dataout_timer(cmd);
2209
2210 device->unreg_rdma_mem(isert_cmd, isert_conn);
2211}
2212
e70beee7
NB		 2213static enum target_prot_op
2214isert_get_sup_prot_ops(struct iscsi_conn *conn)
2215{
2216 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2217 struct isert_device *device = isert_conn->conn_device;
2218
2219 if (device->pi_capable)
2220 return TARGET_PROT_ALL;
2221
2222 return TARGET_PROT_NORMAL;
2223}
2224
b8d26b3b
NB		 2225static int
2226isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2227 bool nopout_response)
2228{
d703ce2f 2229 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2230 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2231 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2232
2233 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2234 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
2235 &isert_cmd->tx_desc.iscsi_header,
2236 nopout_response);
2237 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 2238 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b 2239
8b513d0c 2240 pr_debug("Posting NOPIN Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
b8d26b3b
NB		 2241
2242 return isert_post_response(isert_conn, isert_cmd);
2243}
2244
2245static int
2246isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2247{
d703ce2f 2248 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2249 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2250 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2251
2252 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2253 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
2254 &isert_cmd->tx_desc.iscsi_header);
2255 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 2256 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 2257
2258 pr_debug("Posting Logout Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2259
2260 return isert_post_response(isert_conn, isert_cmd);
2261}
2262
2263static int
2264isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2265{
d703ce2f 2266 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2267 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2268 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2269
2270 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2271 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
2272 &isert_cmd->tx_desc.iscsi_header);
2273 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
95b60f07 2274 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 2275
2276 pr_debug("Posting Task Management Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2277
2278 return isert_post_response(isert_conn, isert_cmd);
2279}
2280
2281static int
2282isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2283{
d703ce2f 2284 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2285 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2286 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
3df8f68a
NB		 2287 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2288 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2289 struct iscsi_reject *hdr =
2290 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
b8d26b3b
NB		 2291
2292 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
3df8f68a 2293 iscsit_build_reject(cmd, conn, hdr);
b8d26b3b 2294 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
3df8f68a
NB		 2295
2296 hton24(hdr->dlength, ISCSI_HDR_LEN);
dbbc5d11 2297 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
3df8f68a
NB		 2298 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
2299 DMA_TO_DEVICE);
dbbc5d11
NB		 2300 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
2301 tx_dsg->addr = isert_cmd->pdu_buf_dma;
3df8f68a
NB		 2302 tx_dsg->length = ISCSI_HDR_LEN;
2303 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2304 isert_cmd->tx_desc.num_sge = 2;
2305
95b60f07 2306 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
b8d26b3b
NB		 2307
2308 pr_debug("Posting Reject IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2309
2310 return isert_post_response(isert_conn, isert_cmd);
2311}
2312
adb54c29
NB		 2313static int
2314isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2315{
d703ce2f 2316 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
adb54c29
NB		 2317 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
2318 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
2319 struct iscsi_text_rsp *hdr =
2320 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
2321 u32 txt_rsp_len;
2322 int rc;
2323
2324 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
22c7aaa5 2325 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
adb54c29
NB		 2326 if (rc < 0)
2327 return rc;
2328
2329 txt_rsp_len = rc;
2330 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2331
2332 if (txt_rsp_len) {
2333 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2334 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2335 void *txt_rsp_buf = cmd->buf_ptr;
2336
2337 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2338 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2339
2340 isert_cmd->pdu_buf_len = txt_rsp_len;
2341 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2342 tx_dsg->length = txt_rsp_len;
2343 tx_dsg->lkey = isert_conn->conn_mr->lkey;
2344 isert_cmd->tx_desc.num_sge = 2;
2345 }
95b60f07 2346 isert_init_send_wr(isert_conn, isert_cmd, send_wr, false);
adb54c29
NB		 2347
2348 pr_debug("Posting Text Response IB_WR_SEND >>>>>>>>>>>>>>>>>>>>>>\n");
2349
2350 return isert_post_response(isert_conn, isert_cmd);
2351}
2352
b8d26b3b
NB		 2353static int
2354isert_build_rdma_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
2355 struct ib_sge *ib_sge, struct ib_send_wr *send_wr,
2356 u32 data_left, u32 offset)
2357{
d703ce2f 2358 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
b8d26b3b
NB		 2359 struct scatterlist *sg_start, *tmp_sg;
2360 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
2361 u32 sg_off, page_off;
2362 int i = 0, sg_nents;
2363
2364 sg_off = offset / PAGE_SIZE;
2365 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
2366 sg_nents = min(cmd->se_cmd.t_data_nents - sg_off, isert_conn->max_sge);
2367 page_off = offset % PAGE_SIZE;
2368
2369 send_wr->sg_list = ib_sge;
2370 send_wr->num_sge = sg_nents;
2371 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2372 /*
2373 * Perform mapping of TCM scatterlist memory ib_sge dma_addr.
2374 */
2375 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2376 pr_debug("ISER RDMA from SGL dma_addr: 0x%16llx dma_len: %u, page_off: %u\n",
2377 (unsigned long long)tmp_sg->dma_address,
2378 tmp_sg->length, page_off);
2379
2380 ib_sge->addr = ib_sg_dma_address(ib_dev, tmp_sg) + page_off;
2381 ib_sge->length = min_t(u32, data_left,
2382 ib_sg_dma_len(ib_dev, tmp_sg) - page_off);
2383 ib_sge->lkey = isert_conn->conn_mr->lkey;
2384
90ecc6e2
VP		 2385 pr_debug("RDMA ib_sge: addr: 0x%16llx length: %u lkey: %08x\n",
2386 ib_sge->addr, ib_sge->length, ib_sge->lkey);
b8d26b3b
NB		 2387 page_off = 0;
2388 data_left -= ib_sge->length;
2389 ib_sge++;
2390 pr_debug("Incrementing ib_sge pointer to %p\n", ib_sge);
2391 }
2392
2393 pr_debug("Set outgoing sg_list: %p num_sg: %u from TCM SGLs\n",
2394 send_wr->sg_list, send_wr->num_sge);
2395
2396 return sg_nents;
2397}
2398
2399static int
90ecc6e2
VP		 2400isert_map_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2401 struct isert_rdma_wr *wr)
b8d26b3b
NB		 2402{
2403 struct se_cmd *se_cmd = &cmd->se_cmd;
d703ce2f 2404 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b 2405 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
e3d7e4c3 2406 struct isert_data_buf *data = &wr->data;
90ecc6e2 2407 struct ib_send_wr *send_wr;
b8d26b3b 2408 struct ib_sge *ib_sge;
e3d7e4c3
SG		 2409 u32 offset, data_len, data_left, rdma_write_max, va_offset = 0;
2410 int ret = 0, i, ib_sge_cnt;
90ecc6e2 2411
e3d7e4c3 2412 isert_cmd->tx_desc.isert_cmd = isert_cmd;
b8d26b3b 2413
e3d7e4c3
SG		 2414 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2415 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2416 se_cmd->t_data_nents, se_cmd->data_length,
2417 offset, wr->iser_ib_op, &wr->data);
2418 if (ret)
2419 return ret;
b8d26b3b 2420
e3d7e4c3
SG		 2421 data_left = data->len;
2422 offset = data->offset;
b8d26b3b 2423
e3d7e4c3 2424 ib_sge = kzalloc(sizeof(struct ib_sge) * data->nents, GFP_KERNEL);
b8d26b3b 2425 if (!ib_sge) {
90ecc6e2 2426 pr_warn("Unable to allocate ib_sge\n");
b8d26b3b 2427 ret = -ENOMEM;
e3d7e4c3 2428 goto unmap_cmd;
b8d26b3b 2429 }
90ecc6e2 2430 wr->ib_sge = ib_sge;
b8d26b3b 2431
e3d7e4c3 2432 wr->send_wr_num = DIV_ROUND_UP(data->nents, isert_conn->max_sge);
b8d26b3b
NB		 2433 wr->send_wr = kzalloc(sizeof(struct ib_send_wr) * wr->send_wr_num,
2434 GFP_KERNEL);
2435 if (!wr->send_wr) {
90ecc6e2 2436 pr_debug("Unable to allocate wr->send_wr\n");
b8d26b3b 2437 ret = -ENOMEM;
e3d7e4c3 2438 goto unmap_cmd;
b8d26b3b 2439 }
b8d26b3b
NB		 2440
2441 wr->isert_cmd = isert_cmd;
2442 rdma_write_max = isert_conn->max_sge * PAGE_SIZE;
b8d26b3b
NB		 2443
2444 for (i = 0; i < wr->send_wr_num; i++) {
2445 send_wr = &isert_cmd->rdma_wr.send_wr[i];
2446 data_len = min(data_left, rdma_write_max);
2447
b8d26b3b 2448 send_wr->send_flags = 0;
90ecc6e2
VP		 2449 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2450 send_wr->opcode = IB_WR_RDMA_WRITE;
2451 send_wr->wr.rdma.remote_addr = isert_cmd->read_va + offset;
2452 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
2453 if (i + 1 == wr->send_wr_num)
2454 send_wr->next = &isert_cmd->tx_desc.send_wr;
2455 else
2456 send_wr->next = &wr->send_wr[i + 1];
2457 } else {
2458 send_wr->opcode = IB_WR_RDMA_READ;
2459 send_wr->wr.rdma.remote_addr = isert_cmd->write_va + va_offset;
2460 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2461 if (i + 1 == wr->send_wr_num)
2462 send_wr->send_flags = IB_SEND_SIGNALED;
2463 else
2464 send_wr->next = &wr->send_wr[i + 1];
2465 }
b8d26b3b
NB		 2466
2467 ib_sge_cnt = isert_build_rdma_wr(isert_conn, isert_cmd, ib_sge,
2468 send_wr, data_len, offset);
2469 ib_sge += ib_sge_cnt;
2470
b8d26b3b 2471 offset += data_len;
90ecc6e2 2472 va_offset += data_len;
b8d26b3b
NB		 2473 data_left -= data_len;
2474 }
90ecc6e2
VP		 2475
2476 return 0;
e3d7e4c3
SG		 2477unmap_cmd:
2478 isert_unmap_data_buf(isert_conn, data);
2479
90ecc6e2
VP		 2480 return ret;
2481}
2482
59464ef4
VP		 2483static int
2484isert_map_fr_pagelist(struct ib_device *ib_dev,
2485 struct scatterlist *sg_start, int sg_nents, u64 *fr_pl)
2486{
2487 u64 start_addr, end_addr, page, chunk_start = 0;
2488 struct scatterlist *tmp_sg;
2489 int i = 0, new_chunk, last_ent, n_pages;
2490
2491 n_pages = 0;
2492 new_chunk = 1;
2493 last_ent = sg_nents - 1;
2494 for_each_sg(sg_start, tmp_sg, sg_nents, i) {
2495 start_addr = ib_sg_dma_address(ib_dev, tmp_sg);
2496 if (new_chunk)
2497 chunk_start = start_addr;
2498 end_addr = start_addr + ib_sg_dma_len(ib_dev, tmp_sg);
2499
2500 pr_debug("SGL[%d] dma_addr: 0x%16llx len: %u\n",
2501 i, (unsigned long long)tmp_sg->dma_address,
2502 tmp_sg->length);
2503
2504 if ((end_addr & ~PAGE_MASK) && i < last_ent) {
2505 new_chunk = 0;
2506 continue;
2507 }
2508 new_chunk = 1;
2509
2510 page = chunk_start & PAGE_MASK;
2511 do {
2512 fr_pl[n_pages++] = page;
2513 pr_debug("Mapped page_list[%d] page_addr: 0x%16llx\n",
2514 n_pages - 1, page);
2515 page += PAGE_SIZE;
2516 } while (page < end_addr);
2517 }
2518
2519 return n_pages;
2520}
2521
2522static int
e3d7e4c3
SG		 2523isert_fast_reg_mr(struct isert_conn *isert_conn,
2524 struct fast_reg_descriptor *fr_desc,
2525 struct isert_data_buf *mem,
9e961ae7 2526 enum isert_indicator ind,
e3d7e4c3 2527 struct ib_sge *sge)
59464ef4 2528{
59464ef4 2529 struct ib_device *ib_dev = isert_conn->conn_cm_id->device;
9e961ae7
SG		 2530 struct ib_mr *mr;
2531 struct ib_fast_reg_page_list *frpl;
59464ef4
VP		 2532 struct ib_send_wr fr_wr, inv_wr;
2533 struct ib_send_wr *bad_wr, *wr = NULL;
9bd626e7
SG		 2534 int ret, pagelist_len;
2535 u32 page_off;
59464ef4 2536 u8 key;
59464ef4 2537
e3d7e4c3
SG		 2538 if (mem->dma_nents == 1) {
2539 sge->lkey = isert_conn->conn_mr->lkey;
2540 sge->addr = ib_sg_dma_address(ib_dev, &mem->sg[0]);
2541 sge->length = ib_sg_dma_len(ib_dev, &mem->sg[0]);
9e961ae7
SG		 2542 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2543 __func__, __LINE__, sge->addr, sge->length,
2544 sge->lkey);
e3d7e4c3
SG		 2545 return 0;
2546 }
2547
9e961ae7
SG		 2548 if (ind == ISERT_DATA_KEY_VALID) {
2549 /* Registering data buffer */
2550 mr = fr_desc->data_mr;
2551 frpl = fr_desc->data_frpl;
2552 } else {
2553 /* Registering protection buffer */
2554 mr = fr_desc->pi_ctx->prot_mr;
2555 frpl = fr_desc->pi_ctx->prot_frpl;
2556 }
2557
e3d7e4c3 2558 page_off = mem->offset % PAGE_SIZE;
59464ef4 2559
9bd626e7 2560 pr_debug("Use fr_desc %p sg_nents %d offset %u\n",
e3d7e4c3 2561 fr_desc, mem->nents, mem->offset);
59464ef4 2562
e3d7e4c3 2563 pagelist_len = isert_map_fr_pagelist(ib_dev, mem->sg, mem->nents,
9e961ae7 2564 &frpl->page_list[0]);
59464ef4 2565
d3e125da 2566 if (!(fr_desc->ind & ISERT_DATA_KEY_VALID)) {
59464ef4 2567 memset(&inv_wr, 0, sizeof(inv_wr));
9bb4ca68 2568 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
59464ef4 2569 inv_wr.opcode = IB_WR_LOCAL_INV;
9e961ae7 2570 inv_wr.ex.invalidate_rkey = mr->rkey;
59464ef4
VP		 2571 wr = &inv_wr;
2572 /* Bump the key */
9e961ae7
SG		 2573 key = (u8)(mr->rkey & 0x000000FF);
2574 ib_update_fast_reg_key(mr, ++key);
59464ef4
VP		 2575 }
2576
2577 /* Prepare FASTREG WR */
2578 memset(&fr_wr, 0, sizeof(fr_wr));
9bb4ca68 2579 fr_wr.wr_id = ISER_FASTREG_LI_WRID;
59464ef4 2580 fr_wr.opcode = IB_WR_FAST_REG_MR;
9e961ae7
SG		 2581 fr_wr.wr.fast_reg.iova_start = frpl->page_list[0] + page_off;
2582 fr_wr.wr.fast_reg.page_list = frpl;
59464ef4
VP		 2583 fr_wr.wr.fast_reg.page_list_len = pagelist_len;
2584 fr_wr.wr.fast_reg.page_shift = PAGE_SHIFT;
e3d7e4c3 2585 fr_wr.wr.fast_reg.length = mem->len;
9e961ae7 2586 fr_wr.wr.fast_reg.rkey = mr->rkey;
59464ef4
VP		 2587 fr_wr.wr.fast_reg.access_flags = IB_ACCESS_LOCAL_WRITE;
2588
2589 if (!wr)
2590 wr = &fr_wr;
2591 else
2592 wr->next = &fr_wr;
2593
2594 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2595 if (ret) {
2596 pr_err("fast registration failed, ret:%d\n", ret);
2597 return ret;
2598 }
9e961ae7 2599 fr_desc->ind &= ~ind;
59464ef4 2600
9e961ae7
SG		 2601 sge->lkey = mr->lkey;
2602 sge->addr = frpl->page_list[0] + page_off;
e3d7e4c3 2603 sge->length = mem->len;
59464ef4 2604
9e961ae7
SG		 2605 pr_debug("%s:%d sge: addr: 0x%llx length: %u lkey: %x\n",
2606 __func__, __LINE__, sge->addr, sge->length,
2607 sge->lkey);
2608
2609 return ret;
2610}
2611
3d73cf1a
SG		 2612static inline void
2613isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2614 struct ib_sig_domain *domain)
2615{
78eda2bb 2616 domain->sig_type = IB_SIG_TYPE_T10_DIF;
3d73cf1a
SG		 2617 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2618 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2619 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
78eda2bb
SG		 2620 /*
2621 * At the moment we hard code those, but if in the future
2622 * the target core would like to use it, we will take it
2623 * from se_cmd.
2624 */
2625 domain->sig.dif.apptag_check_mask = 0xffff;
2626 domain->sig.dif.app_escape = true;
2627 domain->sig.dif.ref_escape = true;
2628 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2629 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2630 domain->sig.dif.ref_remap = true;
3d73cf1a
SG		 2631};
2632
9e961ae7
SG		 2633static int
2634isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2635{
9e961ae7
SG		 2636 switch (se_cmd->prot_op) {
2637 case TARGET_PROT_DIN_INSERT:
2638 case TARGET_PROT_DOUT_STRIP:
78eda2bb 2639 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
3d73cf1a 2640 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
9e961ae7
SG		 2641 break;
2642 case TARGET_PROT_DOUT_INSERT:
2643 case TARGET_PROT_DIN_STRIP:
78eda2bb 2644 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
3d73cf1a 2645 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
9e961ae7
SG		 2646 break;
2647 case TARGET_PROT_DIN_PASS:
2648 case TARGET_PROT_DOUT_PASS:
3d73cf1a
SG		 2649 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2650 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
9e961ae7
SG		 2651 break;
2652 default:
2653 pr_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2654 return -EINVAL;
2655 }
2656
2657 return 0;
2658}
2659
2660static inline u8
2661isert_set_prot_checks(u8 prot_checks)
2662{
2663 return (prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2664 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2665 (prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2666}
2667
2668static int
2669isert_reg_sig_mr(struct isert_conn *isert_conn, struct se_cmd *se_cmd,
2670 struct fast_reg_descriptor *fr_desc,
2671 struct ib_sge *data_sge, struct ib_sge *prot_sge,
2672 struct ib_sge *sig_sge)
2673{
2674 struct ib_send_wr sig_wr, inv_wr;
2675 struct ib_send_wr *bad_wr, *wr = NULL;
2676 struct pi_context *pi_ctx = fr_desc->pi_ctx;
2677 struct ib_sig_attrs sig_attrs;
2678 int ret;
2679 u32 key;
2680
2681 memset(&sig_attrs, 0, sizeof(sig_attrs));
2682 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2683 if (ret)
2684 goto err;
59464ef4 2685
9e961ae7
SG		 2686 sig_attrs.check_mask = isert_set_prot_checks(se_cmd->prot_checks);
2687
2688 if (!(fr_desc->ind & ISERT_SIG_KEY_VALID)) {
2689 memset(&inv_wr, 0, sizeof(inv_wr));
2690 inv_wr.opcode = IB_WR_LOCAL_INV;
c2caa207 2691 inv_wr.wr_id = ISER_FASTREG_LI_WRID;
9e961ae7
SG		 2692 inv_wr.ex.invalidate_rkey = pi_ctx->sig_mr->rkey;
2693 wr = &inv_wr;
2694 /* Bump the key */
2695 key = (u8)(pi_ctx->sig_mr->rkey & 0x000000FF);
2696 ib_update_fast_reg_key(pi_ctx->sig_mr, ++key);
2697 }
2698
2699 memset(&sig_wr, 0, sizeof(sig_wr));
2700 sig_wr.opcode = IB_WR_REG_SIG_MR;
c2caa207 2701 sig_wr.wr_id = ISER_FASTREG_LI_WRID;
9e961ae7
SG		 2702 sig_wr.sg_list = data_sge;
2703 sig_wr.num_sge = 1;
2704 sig_wr.wr.sig_handover.access_flags = IB_ACCESS_LOCAL_WRITE;
2705 sig_wr.wr.sig_handover.sig_attrs = &sig_attrs;
2706 sig_wr.wr.sig_handover.sig_mr = pi_ctx->sig_mr;
2707 if (se_cmd->t_prot_sg)
2708 sig_wr.wr.sig_handover.prot = prot_sge;
2709
2710 if (!wr)
2711 wr = &sig_wr;
2712 else
2713 wr->next = &sig_wr;
2714
2715 ret = ib_post_send(isert_conn->conn_qp, wr, &bad_wr);
2716 if (ret) {
2717 pr_err("fast registration failed, ret:%d\n", ret);
2718 goto err;
2719 }
2720 fr_desc->ind &= ~ISERT_SIG_KEY_VALID;
2721
2722 sig_sge->lkey = pi_ctx->sig_mr->lkey;
2723 sig_sge->addr = 0;
2724 sig_sge->length = se_cmd->data_length;
2725 if (se_cmd->prot_op != TARGET_PROT_DIN_STRIP &&
2726 se_cmd->prot_op != TARGET_PROT_DOUT_INSERT)
2727 /*
2728 * We have protection guards on the wire
2729 * so we need to set a larget transfer
2730 */
2731 sig_sge->length += se_cmd->prot_length;
2732
2733 pr_debug("sig_sge: addr: 0x%llx length: %u lkey: %x\n",
2734 sig_sge->addr, sig_sge->length,
2735 sig_sge->lkey);
2736err:
59464ef4
VP		 2737 return ret;
2738}
2739
2740static int
a3a5a826
SG		 2741isert_reg_rdma(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2742 struct isert_rdma_wr *wr)
59464ef4
VP		 2743{
2744 struct se_cmd *se_cmd = &cmd->se_cmd;
2745 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
e3d7e4c3 2746 struct isert_conn *isert_conn = conn->context;
9e961ae7 2747 struct ib_sge data_sge;
59464ef4 2748 struct ib_send_wr *send_wr;
e3d7e4c3
SG		 2749 struct fast_reg_descriptor *fr_desc = NULL;
2750 u32 offset;
2751 int ret = 0;
59464ef4
VP		 2752 unsigned long flags;
2753
e3d7e4c3 2754 isert_cmd->tx_desc.isert_cmd = isert_cmd;
59464ef4 2755
e3d7e4c3
SG		 2756 offset = wr->iser_ib_op == ISER_IB_RDMA_READ ? cmd->write_data_done : 0;
2757 ret = isert_map_data_buf(isert_conn, isert_cmd, se_cmd->t_data_sg,
2758 se_cmd->t_data_nents, se_cmd->data_length,
2759 offset, wr->iser_ib_op, &wr->data);
2760 if (ret)
2761 return ret;
59464ef4 2762
9e961ae7
SG		 2763 if (wr->data.dma_nents != 1 ||
2764 se_cmd->prot_op != TARGET_PROT_NORMAL) {
e3d7e4c3
SG		 2765 spin_lock_irqsave(&isert_conn->conn_lock, flags);
2766 fr_desc = list_first_entry(&isert_conn->conn_fr_pool,
2767 struct fast_reg_descriptor, list);
2768 list_del(&fr_desc->list);
2769 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
2770 wr->fr_desc = fr_desc;
59464ef4 2771 }
59464ef4 2772
9e961ae7
SG		 2773 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->data,
2774 ISERT_DATA_KEY_VALID, &data_sge);
e3d7e4c3
SG		 2775 if (ret)
2776 goto unmap_cmd;
59464ef4 2777
9e961ae7
SG		 2778 if (se_cmd->prot_op != TARGET_PROT_NORMAL) {
2779 struct ib_sge prot_sge, sig_sge;
2780
2781 if (se_cmd->t_prot_sg) {
2782 ret = isert_map_data_buf(isert_conn, isert_cmd,
2783 se_cmd->t_prot_sg,
2784 se_cmd->t_prot_nents,
2785 se_cmd->prot_length,
2786 0, wr->iser_ib_op, &wr->prot);
2787 if (ret)
2788 goto unmap_cmd;
2789
2790 ret = isert_fast_reg_mr(isert_conn, fr_desc, &wr->prot,
2791 ISERT_PROT_KEY_VALID, &prot_sge);
2792 if (ret)
2793 goto unmap_prot_cmd;
2794 }
2795
2796 ret = isert_reg_sig_mr(isert_conn, se_cmd, fr_desc,
2797 &data_sge, &prot_sge, &sig_sge);
2798 if (ret)
2799 goto unmap_prot_cmd;
2800
2801 fr_desc->ind |= ISERT_PROTECTED;
2802 memcpy(&wr->s_ib_sge, &sig_sge, sizeof(sig_sge));
2803 } else
2804 memcpy(&wr->s_ib_sge, &data_sge, sizeof(data_sge));
2805
e3d7e4c3 2806 wr->ib_sge = &wr->s_ib_sge;
59464ef4
VP		 2807 wr->send_wr_num = 1;
2808 memset(&wr->s_send_wr, 0, sizeof(*send_wr));
2809 wr->send_wr = &wr->s_send_wr;
59464ef4 2810 wr->isert_cmd = isert_cmd;
59464ef4
VP		 2811
2812 send_wr = &isert_cmd->rdma_wr.s_send_wr;
e3d7e4c3 2813 send_wr->sg_list = &wr->s_ib_sge;
59464ef4
VP		 2814 send_wr->num_sge = 1;
2815 send_wr->wr_id = (unsigned long)&isert_cmd->tx_desc;
2816 if (wr->iser_ib_op == ISER_IB_RDMA_WRITE) {
2817 send_wr->opcode = IB_WR_RDMA_WRITE;
2818 send_wr->wr.rdma.remote_addr = isert_cmd->read_va;
2819 send_wr->wr.rdma.rkey = isert_cmd->read_stag;
9e961ae7
SG		 2820 send_wr->send_flags = se_cmd->prot_op == TARGET_PROT_NORMAL ?
2821 0 : IB_SEND_SIGNALED;
59464ef4
VP		 2822 } else {
2823 send_wr->opcode = IB_WR_RDMA_READ;
2824 send_wr->wr.rdma.remote_addr = isert_cmd->write_va;
2825 send_wr->wr.rdma.rkey = isert_cmd->write_stag;
2826 send_wr->send_flags = IB_SEND_SIGNALED;
2827 }
2828
e3d7e4c3 2829 return 0;
9e961ae7
SG		 2830unmap_prot_cmd:
2831 if (se_cmd->t_prot_sg)
2832 isert_unmap_data_buf(isert_conn, &wr->prot);
e3d7e4c3
SG		 2833unmap_cmd:
2834 if (fr_desc) {
f01b9f73 2835 spin_lock_irqsave(&isert_conn->conn_lock, flags);
e3d7e4c3 2836 list_add_tail(&fr_desc->list, &isert_conn->conn_fr_pool);
f01b9f73 2837 spin_unlock_irqrestore(&isert_conn->conn_lock, flags);
59464ef4 2838 }
e3d7e4c3 2839 isert_unmap_data_buf(isert_conn, &wr->data);
59464ef4 2840
59464ef4
VP		 2841 return ret;
2842}
2843
90ecc6e2
VP		 2844static int
2845isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2846{
2847 struct se_cmd *se_cmd = &cmd->se_cmd;
59464ef4 2848 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
90ecc6e2
VP		 2849 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2850 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
d40945d8 2851 struct isert_device *device = isert_conn->conn_device;
90ecc6e2
VP		 2852 struct ib_send_wr *wr_failed;
2853 int rc;
2854
2855 pr_debug("Cmd: %p RDMA_WRITE data_length: %u\n",
2856 isert_cmd, se_cmd->data_length);
2857 wr->iser_ib_op = ISER_IB_RDMA_WRITE;
d40945d8 2858 rc = device->reg_rdma_mem(conn, cmd, wr);
90ecc6e2
VP		 2859 if (rc) {
2860 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2861 return rc;
2862 }
2863
9e961ae7
SG		 2864 if (se_cmd->prot_op == TARGET_PROT_NORMAL) {
2865 /*
2866 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2867 */
2868 isert_create_send_desc(isert_conn, isert_cmd,
2869 &isert_cmd->tx_desc);
2870 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2871 &isert_cmd->tx_desc.iscsi_header);
2872 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2873 isert_init_send_wr(isert_conn, isert_cmd,
0d0f660d 2874 &isert_cmd->tx_desc.send_wr, false);
9e961ae7 2875 isert_cmd->rdma_wr.s_send_wr.next = &isert_cmd->tx_desc.send_wr;
897bb2c9 2876 wr->send_wr_num += 1;
9e961ae7 2877 }
b8d26b3b 2878
897bb2c9 2879 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 2880
2881 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2882 if (rc) {
2883 pr_warn("ib_post_send() failed for IB_WR_RDMA_WRITE\n");
897bb2c9 2884 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b 2885 }
9e961ae7
SG		 2886
2887 if (se_cmd->prot_op == TARGET_PROT_NORMAL)
2888 pr_debug("Cmd: %p posted RDMA_WRITE + Response for iSER Data "
2889 "READ\n", isert_cmd);
2890 else
2891 pr_debug("Cmd: %p posted RDMA_WRITE for iSER Data READ\n",
2892 isert_cmd);
b8d26b3b 2893
90ecc6e2 2894 return 1;
b8d26b3b
NB		 2895}
2896
2897static int
2898isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2899{
2900 struct se_cmd *se_cmd = &cmd->se_cmd;
d703ce2f 2901 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
b8d26b3b
NB		 2902 struct isert_rdma_wr *wr = &isert_cmd->rdma_wr;
2903 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
d40945d8 2904 struct isert_device *device = isert_conn->conn_device;
90ecc6e2
VP		 2905 struct ib_send_wr *wr_failed;
2906 int rc;
b8d26b3b 2907
90ecc6e2
VP		 2908 pr_debug("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2909 isert_cmd, se_cmd->data_length, cmd->write_data_done);
b8d26b3b 2910 wr->iser_ib_op = ISER_IB_RDMA_READ;
d40945d8 2911 rc = device->reg_rdma_mem(conn, cmd, wr);
90ecc6e2
VP		 2912 if (rc) {
2913 pr_err("Cmd: %p failed to prepare RDMA res\n", isert_cmd);
2914 return rc;
b8d26b3b
NB		 2915 }
2916
b6b87a1d 2917 atomic_add(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b
NB		 2918
2919 rc = ib_post_send(isert_conn->conn_qp, wr->send_wr, &wr_failed);
2920 if (rc) {
2921 pr_warn("ib_post_send() failed for IB_WR_RDMA_READ\n");
b6b87a1d 2922 atomic_sub(wr->send_wr_num, &isert_conn->post_send_buf_count);
b8d26b3b 2923 }
90ecc6e2
VP		 2924 pr_debug("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2925 isert_cmd);
b8d26b3b 2926
90ecc6e2 2927 return 0;
b8d26b3b
NB		 2928}
2929
2930static int
2931isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2932{
2933 int ret;
2934
2935 switch (state) {
2936 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2937 ret = isert_put_nopin(cmd, conn, false);
2938 break;
2939 default:
2940 pr_err("Unknown immediate state: 0x%02x\n", state);
2941 ret = -EINVAL;
2942 break;
2943 }
2944
2945 return ret;
2946}
2947
2948static int
2949isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2950{
2951 int ret;
2952
2953 switch (state) {
2954 case ISTATE_SEND_LOGOUTRSP:
2955 ret = isert_put_logout_rsp(cmd, conn);
2956 if (!ret) {
2957 pr_debug("Returning iSER Logout -EAGAIN\n");
2958 ret = -EAGAIN;
2959 }
2960 break;
2961 case ISTATE_SEND_NOPIN:
2962 ret = isert_put_nopin(cmd, conn, true);
2963 break;
2964 case ISTATE_SEND_TASKMGTRSP:
2965 ret = isert_put_tm_rsp(cmd, conn);
2966 break;
2967 case ISTATE_SEND_REJECT:
2968 ret = isert_put_reject(cmd, conn);
2969 break;
adb54c29
NB		 2970 case ISTATE_SEND_TEXTRSP:
2971 ret = isert_put_text_rsp(cmd, conn);
2972 break;
b8d26b3b
NB		 2973 case ISTATE_SEND_STATUS:
2974 /*
2975 * Special case for sending non GOOD SCSI status from TX thread
2976 * context during pre se_cmd excecution failure.
2977 */
2978 ret = isert_put_response(conn, cmd);
2979 break;
2980 default:
2981 pr_err("Unknown response state: 0x%02x\n", state);
2982 ret = -EINVAL;
2983 break;
2984 }
2985
2986 return ret;
2987}
2988
2989static int
2990isert_setup_np(struct iscsi_np *np,
2991 struct __kernel_sockaddr_storage *ksockaddr)
2992{
2993 struct isert_np *isert_np;
2994 struct rdma_cm_id *isert_lid;
2995 struct sockaddr *sa;
2996 int ret;
2997
2998 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2999 if (!isert_np) {
3000 pr_err("Unable to allocate struct isert_np\n");
3001 return -ENOMEM;
3002 }
531b7bf4 3003 sema_init(&isert_np->np_sem, 0);
b8d26b3b
NB		 3004 mutex_init(&isert_np->np_accept_mutex);
3005 INIT_LIST_HEAD(&isert_np->np_accept_list);
3006 init_completion(&isert_np->np_login_comp);
3007
3008 sa = (struct sockaddr *)ksockaddr;
3009 pr_debug("ksockaddr: %p, sa: %p\n", ksockaddr, sa);
3010 /*
3011 * Setup the np->np_sockaddr from the passed sockaddr setup
3012 * in iscsi_target_configfs.c code..
3013 */
3014 memcpy(&np->np_sockaddr, ksockaddr,
3015 sizeof(struct __kernel_sockaddr_storage));
3016
3017 isert_lid = rdma_create_id(isert_cma_handler, np, RDMA_PS_TCP,
3018 IB_QPT_RC);
3019 if (IS_ERR(isert_lid)) {
3020 pr_err("rdma_create_id() for isert_listen_handler failed: %ld\n",
3021 PTR_ERR(isert_lid));
3022 ret = PTR_ERR(isert_lid);
3023 goto out;
3024 }
3025
3026 ret = rdma_bind_addr(isert_lid, sa);
3027 if (ret) {
3028 pr_err("rdma_bind_addr() for isert_lid failed: %d\n", ret);
3029 goto out_lid;
3030 }
3031
3032 ret = rdma_listen(isert_lid, ISERT_RDMA_LISTEN_BACKLOG);
3033 if (ret) {
3034 pr_err("rdma_listen() for isert_lid failed: %d\n", ret);
3035 goto out_lid;
3036 }
3037
3038 isert_np->np_cm_id = isert_lid;
3039 np->np_context = isert_np;
3040 pr_debug("Setup isert_lid->context: %p\n", isert_lid->context);
3041
3042 return 0;
3043
3044out_lid:
3045 rdma_destroy_id(isert_lid);
3046out:
3047 kfree(isert_np);
3048 return ret;
3049}
3050
b8d26b3b
NB		 3051static int
3052isert_rdma_accept(struct isert_conn *isert_conn)
3053{
3054 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3055 struct rdma_conn_param cp;
3056 int ret;
3057
3058 memset(&cp, 0, sizeof(struct rdma_conn_param));
b8d26b3b
NB		 3059 cp.initiator_depth = isert_conn->initiator_depth;
3060 cp.retry_count = 7;
3061 cp.rnr_retry_count = 7;
3062
3063 pr_debug("Before rdma_accept >>>>>>>>>>>>>>>>>>>>.\n");
3064
3065 ret = rdma_accept(cm_id, &cp);
3066 if (ret) {
3067 pr_err("rdma_accept() failed with: %d\n", ret);
3068 return ret;
3069 }
3070
3071 pr_debug("After rdma_accept >>>>>>>>>>>>>>>>>>>>>.\n");
3072
3073 return 0;
3074}
3075
3076static int
3077isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
3078{
3079 struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
3080 int ret;
3081
3082 pr_debug("isert_get_login_rx before conn_login_comp conn: %p\n", conn);
6faaa85f
NB		 3083 /*
3084 * For login requests after the first PDU, isert_rx_login_req() will
3085 * kick schedule_delayed_work(&conn->login_work) as the packet is
3086 * received, which turns this callback from iscsi_target_do_login_rx()
3087 * into a NOP.
3088 */
3089 if (!login->first_request)
3090 return 0;
b8d26b3b
NB		 3091
3092 ret = wait_for_completion_interruptible(&isert_conn->conn_login_comp);
3093 if (ret)
3094 return ret;
3095
3096 pr_debug("isert_get_login_rx processing login->req: %p\n", login->req);
3097 return 0;
3098}
3099
3100static void
3101isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
3102 struct isert_conn *isert_conn)
3103{
3104 struct rdma_cm_id *cm_id = isert_conn->conn_cm_id;
3105 struct rdma_route *cm_route = &cm_id->route;
3106 struct sockaddr_in *sock_in;
3107 struct sockaddr_in6 *sock_in6;
3108
3109 conn->login_family = np->np_sockaddr.ss_family;
3110
3111 if (np->np_sockaddr.ss_family == AF_INET6) {
3112 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.dst_addr;
3113 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
3114 &sock_in6->sin6_addr.in6_u);
3115 conn->login_port = ntohs(sock_in6->sin6_port);
3116
3117 sock_in6 = (struct sockaddr_in6 *)&cm_route->addr.src_addr;
3118 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
3119 &sock_in6->sin6_addr.in6_u);
3120 conn->local_port = ntohs(sock_in6->sin6_port);
3121 } else {
3122 sock_in = (struct sockaddr_in *)&cm_route->addr.dst_addr;
3123 sprintf(conn->login_ip, "%pI4",
3124 &sock_in->sin_addr.s_addr);
3125 conn->login_port = ntohs(sock_in->sin_port);
3126
3127 sock_in = (struct sockaddr_in *)&cm_route->addr.src_addr;
3128 sprintf(conn->local_ip, "%pI4",
3129 &sock_in->sin_addr.s_addr);
3130 conn->local_port = ntohs(sock_in->sin_port);
3131 }
3132}
3133
3134static int
3135isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
3136{
3137 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3138 struct isert_conn *isert_conn;
3139 int max_accept = 0, ret;
3140
3141accept_wait:
531b7bf4 3142 ret = down_interruptible(&isert_np->np_sem);
1acff63f 3143 if (ret || max_accept > 5)
b8d26b3b
NB		 3144 return -ENODEV;
3145
3146 spin_lock_bh(&np->np_thread_lock);
e346ab34 3147 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
b8d26b3b 3148 spin_unlock_bh(&np->np_thread_lock);
e346ab34
SG		 3149 pr_debug("np_thread_state %d for isert_accept_np\n",
3150 np->np_thread_state);
3151 /**
3152 * No point in stalling here when np_thread
3153 * is in state RESET/SHUTDOWN/EXIT - bail
3154 **/
b8d26b3b
NB		 3155 return -ENODEV;
3156 }
3157 spin_unlock_bh(&np->np_thread_lock);
3158
3159 mutex_lock(&isert_np->np_accept_mutex);
3160 if (list_empty(&isert_np->np_accept_list)) {
3161 mutex_unlock(&isert_np->np_accept_mutex);
3162 max_accept++;
3163 goto accept_wait;
3164 }
3165 isert_conn = list_first_entry(&isert_np->np_accept_list,
3166 struct isert_conn, conn_accept_node);
3167 list_del_init(&isert_conn->conn_accept_node);
3168 mutex_unlock(&isert_np->np_accept_mutex);
3169
3170 conn->context = isert_conn;
3171 isert_conn->conn = conn;
3172 max_accept = 0;
3173
3174 ret = isert_rdma_post_recvl(isert_conn);
3175 if (ret)
3176 return ret;
3177
3178 ret = isert_rdma_accept(isert_conn);
3179 if (ret)
3180 return ret;
3181
3182 isert_set_conn_info(np, conn, isert_conn);
3183
3184 pr_debug("Processing isert_accept_np: isert_conn: %p\n", isert_conn);
3185 return 0;
3186}
3187
3188static void
3189isert_free_np(struct iscsi_np *np)
3190{
3191 struct isert_np *isert_np = (struct isert_np *)np->np_context;
3192
3193 rdma_destroy_id(isert_np->np_cm_id);
3194
3195 np->np_context = NULL;
3196 kfree(isert_np);
3197}
3198
defd8848 3199static void isert_wait_conn(struct iscsi_conn *conn)
b8d26b3b
NB		 3200{
3201 struct isert_conn *isert_conn = conn->context;
3202
defd8848 3203 pr_debug("isert_wait_conn: Starting \n");
b8d26b3b 3204
9d49f5e2 3205 mutex_lock(&isert_conn->conn_mutex);
38a8316b 3206 if (isert_conn->conn_cm_id && !isert_conn->disconnect) {
defd8848 3207 pr_debug("Calling rdma_disconnect from isert_wait_conn\n");
b8d26b3b 3208 rdma_disconnect(isert_conn->conn_cm_id);
b2cb9649 3209 }
b8d26b3b
NB		 3210 /*
3211 * Only wait for conn_wait_comp_err if the isert_conn made it
3212 * into full feature phase..
3213 */
b2cb9649
NB		 3214 if (isert_conn->state == ISER_CONN_INIT) {
3215 mutex_unlock(&isert_conn->conn_mutex);
b2cb9649 3216 return;
b8d26b3b 3217 }
defd8848
NB		 3218 if (isert_conn->state == ISER_CONN_UP)
3219 isert_conn->state = ISER_CONN_TERMINATING;
b2cb9649 3220 mutex_unlock(&isert_conn->conn_mutex);
b8d26b3b 3221
defd8848
NB		 3222 wait_for_completion(&isert_conn->conn_wait_comp_err);
3223
3224 wait_for_completion(&isert_conn->conn_wait);
0fc4ea70 3225 isert_put_conn(isert_conn);
defd8848
NB		 3226}
3227
3228static void isert_free_conn(struct iscsi_conn *conn)
3229{
3230 struct isert_conn *isert_conn = conn->context;
b8d26b3b
NB		 3231
3232 isert_put_conn(isert_conn);
3233}
3234
3235static struct iscsit_transport iser_target_transport = {
3236 .name = "IB/iSER",
3237 .transport_type = ISCSI_INFINIBAND,
d703ce2f 3238 .priv_size = sizeof(struct isert_cmd),
b8d26b3b
NB		 3239 .owner = THIS_MODULE,
3240 .iscsit_setup_np = isert_setup_np,
3241 .iscsit_accept_np = isert_accept_np,
3242 .iscsit_free_np = isert_free_np,
defd8848 3243 .iscsit_wait_conn = isert_wait_conn,
b8d26b3b 3244 .iscsit_free_conn = isert_free_conn,
b8d26b3b
NB		 3245 .iscsit_get_login_rx = isert_get_login_rx,
3246 .iscsit_put_login_tx = isert_put_login_tx,
3247 .iscsit_immediate_queue = isert_immediate_queue,
3248 .iscsit_response_queue = isert_response_queue,
3249 .iscsit_get_dataout = isert_get_dataout,
3250 .iscsit_queue_data_in = isert_put_datain,
3251 .iscsit_queue_status = isert_put_response,
131e6abc 3252 .iscsit_aborted_task = isert_aborted_task,
e70beee7 3253 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
b8d26b3b
NB		 3254};
3255
3256static int __init isert_init(void)
3257{
3258 int ret;
3259
3260 isert_rx_wq = alloc_workqueue("isert_rx_wq", 0, 0);
3261 if (!isert_rx_wq) {
3262 pr_err("Unable to allocate isert_rx_wq\n");
3263 return -ENOMEM;
3264 }
3265
3266 isert_comp_wq = alloc_workqueue("isert_comp_wq", 0, 0);
3267 if (!isert_comp_wq) {
3268 pr_err("Unable to allocate isert_comp_wq\n");
3269 ret = -ENOMEM;
3270 goto destroy_rx_wq;
3271 }
3272
b8d26b3b
NB		 3273 iscsit_register_transport(&iser_target_transport);
3274 pr_debug("iSER_TARGET[0] - Loaded iser_target_transport\n");
3275 return 0;
3276
b8d26b3b
NB		 3277destroy_rx_wq:
3278 destroy_workqueue(isert_rx_wq);
3279 return ret;
3280}
3281
3282static void __exit isert_exit(void)
3283{
f5ebec96 3284 flush_scheduled_work();
b8d26b3b
NB		 3285 destroy_workqueue(isert_comp_wq);
3286 destroy_workqueue(isert_rx_wq);
3287 iscsit_unregister_transport(&iser_target_transport);
3288 pr_debug("iSER_TARGET[0] - Released iser_target_transport\n");
3289}
3290
3291MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
3292MODULE_VERSION("0.1");
3293MODULE_AUTHOR("nab@Linux-iSCSI.org");
3294MODULE_LICENSE("GPL");
3295
3296module_init(isert_init);
3297module_exit(isert_exit);
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