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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * This file contains iSCSI extentions for RDMA (iSER) Verbs
4 *
5 * (c) Copyright 2013 Datera, Inc.
6 *
7 * Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ****************************************************************************/
10
11#include <linux/string.h>
12#include <linux/module.h>
13#include <linux/scatterlist.h>
14#include <linux/socket.h>
15#include <linux/in.h>
16#include <linux/in6.h>
17#include <rdma/ib_verbs.h>
18#include <rdma/ib_cm.h>
19#include <rdma/rdma_cm.h>
20#include <target/target_core_base.h>
21#include <target/target_core_fabric.h>
22#include <target/iscsi/iscsi_transport.h>
23#include <linux/semaphore.h>
24
25#include "ib_isert.h"
26
27static int isert_debug_level;
28module_param_named(debug_level, isert_debug_level, int, 0644);
29MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
30
31static int isert_sg_tablesize_set(const char *val,
32 const struct kernel_param *kp);
33static const struct kernel_param_ops sg_tablesize_ops = {
34 .set = isert_sg_tablesize_set,
35 .get = param_get_int,
36};
37
38static int isert_sg_tablesize = ISCSI_ISER_MIN_SG_TABLESIZE;
39module_param_cb(sg_tablesize, &sg_tablesize_ops, &isert_sg_tablesize, 0644);
40MODULE_PARM_DESC(sg_tablesize,
41 "Number of gather/scatter entries in a single scsi command, should >= 128 (default: 128, max: 4096)");
42
43static DEFINE_MUTEX(device_list_mutex);
44static LIST_HEAD(device_list);
45static struct workqueue_struct *isert_login_wq;
46static struct workqueue_struct *isert_comp_wq;
47static struct workqueue_struct *isert_release_wq;
48
49static int
50isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd);
51static int
52isert_login_post_recv(struct isert_conn *isert_conn);
53static int
54isert_rdma_accept(struct isert_conn *isert_conn);
55struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
56
57static void isert_release_work(struct work_struct *work);
58static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
59static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
60static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
61static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
62
63static int isert_sg_tablesize_set(const char *val, const struct kernel_param *kp)
64{
65 int n = 0, ret;
66
67 ret = kstrtoint(val, 10, &n);
68 if (ret != 0 || n < ISCSI_ISER_MIN_SG_TABLESIZE ||
69 n > ISCSI_ISER_MAX_SG_TABLESIZE)
70 return -EINVAL;
71
72 return param_set_int(val, kp);
73}
74
75static inline bool
76isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
77{
78 return (conn->pi_support &&
79 cmd->prot_op != TARGET_PROT_NORMAL);
80}
81
82static void
83isert_qp_event_callback(struct ib_event *e, void *context)
84{
85 struct isert_conn *isert_conn = context;
86
87 isert_err("%s (%d): conn %p\n",
88 ib_event_msg(e->event), e->event, isert_conn);
89
90 switch (e->event) {
91 case IB_EVENT_COMM_EST:
92 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
93 break;
94 case IB_EVENT_QP_LAST_WQE_REACHED:
95 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
96 break;
97 default:
98 break;
99 }
100}
101
102static struct ib_qp *
103isert_create_qp(struct isert_conn *isert_conn,
104 struct rdma_cm_id *cma_id)
105{
106 u32 cq_size = ISERT_QP_MAX_REQ_DTOS + ISERT_QP_MAX_RECV_DTOS + 2;
107 struct isert_device *device = isert_conn->device;
108 struct ib_device *ib_dev = device->ib_device;
109 struct ib_qp_init_attr attr;
110 int ret, factor;
111
112 isert_conn->cq = ib_cq_pool_get(ib_dev, cq_size, -1, IB_POLL_WORKQUEUE);
113 if (IS_ERR(isert_conn->cq)) {
114 isert_err("Unable to allocate cq\n");
115 ret = PTR_ERR(isert_conn->cq);
116 return ERR_PTR(ret);
117 }
118 isert_conn->cq_size = cq_size;
119
120 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
121 attr.event_handler = isert_qp_event_callback;
122 attr.qp_context = isert_conn;
123 attr.send_cq = isert_conn->cq;
124 attr.recv_cq = isert_conn->cq;
125 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
126 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
127 factor = rdma_rw_mr_factor(device->ib_device, cma_id->port_num,
128 isert_sg_tablesize);
129 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX * factor;
130 attr.cap.max_send_sge = device->ib_device->attrs.max_send_sge;
131 attr.cap.max_recv_sge = 1;
132 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
133 attr.qp_type = IB_QPT_RC;
134 if (device->pi_capable)
135 attr.create_flags |= IB_QP_CREATE_INTEGRITY_EN;
136
137 ret = rdma_create_qp(cma_id, device->pd, &attr);
138 if (ret) {
139 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
140 ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
141
142 return ERR_PTR(ret);
143 }
144
145 return cma_id->qp;
146}
147
148static int
149isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
150{
151 struct isert_device *device = isert_conn->device;
152 struct ib_device *ib_dev = device->ib_device;
153 struct iser_rx_desc *rx_desc;
154 struct ib_sge *rx_sg;
155 u64 dma_addr;
156 int i, j;
157
158 isert_conn->rx_descs = kcalloc(ISERT_QP_MAX_RECV_DTOS,
159 sizeof(struct iser_rx_desc),
160 GFP_KERNEL);
161 if (!isert_conn->rx_descs)
162 return -ENOMEM;
163
164 rx_desc = isert_conn->rx_descs;
165
166 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
167 dma_addr = ib_dma_map_single(ib_dev, rx_desc->buf,
168 ISER_RX_SIZE, DMA_FROM_DEVICE);
169 if (ib_dma_mapping_error(ib_dev, dma_addr))
170 goto dma_map_fail;
171
172 rx_desc->dma_addr = dma_addr;
173
174 rx_sg = &rx_desc->rx_sg;
175 rx_sg->addr = rx_desc->dma_addr + isert_get_hdr_offset(rx_desc);
176 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
177 rx_sg->lkey = device->pd->local_dma_lkey;
178 rx_desc->rx_cqe.done = isert_recv_done;
179 }
180
181 return 0;
182
183dma_map_fail:
184 rx_desc = isert_conn->rx_descs;
185 for (j = 0; j < i; j++, rx_desc++) {
186 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
187 ISER_RX_SIZE, DMA_FROM_DEVICE);
188 }
189 kfree(isert_conn->rx_descs);
190 isert_conn->rx_descs = NULL;
191 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
192 return -ENOMEM;
193}
194
195static void
196isert_free_rx_descriptors(struct isert_conn *isert_conn)
197{
198 struct ib_device *ib_dev = isert_conn->device->ib_device;
199 struct iser_rx_desc *rx_desc;
200 int i;
201
202 if (!isert_conn->rx_descs)
203 return;
204
205 rx_desc = isert_conn->rx_descs;
206 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
207 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
208 ISER_RX_SIZE, DMA_FROM_DEVICE);
209 }
210
211 kfree(isert_conn->rx_descs);
212 isert_conn->rx_descs = NULL;
213}
214
215static int
216isert_create_device_ib_res(struct isert_device *device)
217{
218 struct ib_device *ib_dev = device->ib_device;
219 int ret;
220
221 isert_dbg("devattr->max_send_sge: %d devattr->max_recv_sge %d\n",
222 ib_dev->attrs.max_send_sge, ib_dev->attrs.max_recv_sge);
223 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
224
225 device->pd = ib_alloc_pd(ib_dev, 0);
226 if (IS_ERR(device->pd)) {
227 ret = PTR_ERR(device->pd);
228 isert_err("failed to allocate pd, device %p, ret=%d\n",
229 device, ret);
230 return ret;
231 }
232
233 /* Check signature cap */
234 if (ib_dev->attrs.kernel_cap_flags & IBK_INTEGRITY_HANDOVER)
235 device->pi_capable = true;
236 else
237 device->pi_capable = false;
238
239 return 0;
240}
241
242static void
243isert_free_device_ib_res(struct isert_device *device)
244{
245 isert_info("device %p\n", device);
246
247 ib_dealloc_pd(device->pd);
248}
249
250static void
251isert_device_put(struct isert_device *device)
252{
253 mutex_lock(&device_list_mutex);
254 device->refcount--;
255 isert_info("device %p refcount %d\n", device, device->refcount);
256 if (!device->refcount) {
257 isert_free_device_ib_res(device);
258 list_del(&device->dev_node);
259 kfree(device);
260 }
261 mutex_unlock(&device_list_mutex);
262}
263
264static struct isert_device *
265isert_device_get(struct rdma_cm_id *cma_id)
266{
267 struct isert_device *device;
268 int ret;
269
270 mutex_lock(&device_list_mutex);
271 list_for_each_entry(device, &device_list, dev_node) {
272 if (device->ib_device->node_guid == cma_id->device->node_guid) {
273 device->refcount++;
274 isert_info("Found iser device %p refcount %d\n",
275 device, device->refcount);
276 mutex_unlock(&device_list_mutex);
277 return device;
278 }
279 }
280
281 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
282 if (!device) {
283 mutex_unlock(&device_list_mutex);
284 return ERR_PTR(-ENOMEM);
285 }
286
287 INIT_LIST_HEAD(&device->dev_node);
288
289 device->ib_device = cma_id->device;
290 ret = isert_create_device_ib_res(device);
291 if (ret) {
292 kfree(device);
293 mutex_unlock(&device_list_mutex);
294 return ERR_PTR(ret);
295 }
296
297 device->refcount++;
298 list_add_tail(&device->dev_node, &device_list);
299 isert_info("Created a new iser device %p refcount %d\n",
300 device, device->refcount);
301 mutex_unlock(&device_list_mutex);
302
303 return device;
304}
305
306static void
307isert_init_conn(struct isert_conn *isert_conn)
308{
309 isert_conn->state = ISER_CONN_INIT;
310 INIT_LIST_HEAD(&isert_conn->node);
311 init_completion(&isert_conn->login_comp);
312 init_completion(&isert_conn->login_req_comp);
313 init_waitqueue_head(&isert_conn->rem_wait);
314 kref_init(&isert_conn->kref);
315 mutex_init(&isert_conn->mutex);
316 INIT_WORK(&isert_conn->release_work, isert_release_work);
317}
318
319static void
320isert_free_login_buf(struct isert_conn *isert_conn)
321{
322 struct ib_device *ib_dev = isert_conn->device->ib_device;
323
324 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
325 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
326 kfree(isert_conn->login_rsp_buf);
327
328 ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
329 ISER_RX_SIZE, DMA_FROM_DEVICE);
330 kfree(isert_conn->login_desc);
331}
332
333static int
334isert_alloc_login_buf(struct isert_conn *isert_conn,
335 struct ib_device *ib_dev)
336{
337 int ret;
338
339 isert_conn->login_desc = kzalloc(sizeof(*isert_conn->login_desc),
340 GFP_KERNEL);
341 if (!isert_conn->login_desc)
342 return -ENOMEM;
343
344 isert_conn->login_desc->dma_addr = ib_dma_map_single(ib_dev,
345 isert_conn->login_desc->buf,
346 ISER_RX_SIZE, DMA_FROM_DEVICE);
347 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_desc->dma_addr);
348 if (ret) {
349 isert_err("login_desc dma mapping error: %d\n", ret);
350 isert_conn->login_desc->dma_addr = 0;
351 goto out_free_login_desc;
352 }
353
354 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
355 if (!isert_conn->login_rsp_buf) {
356 ret = -ENOMEM;
357 goto out_unmap_login_desc;
358 }
359
360 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
361 isert_conn->login_rsp_buf,
362 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
363 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
364 if (ret) {
365 isert_err("login_rsp_dma mapping error: %d\n", ret);
366 isert_conn->login_rsp_dma = 0;
367 goto out_free_login_rsp_buf;
368 }
369
370 return 0;
371
372out_free_login_rsp_buf:
373 kfree(isert_conn->login_rsp_buf);
374out_unmap_login_desc:
375 ib_dma_unmap_single(ib_dev, isert_conn->login_desc->dma_addr,
376 ISER_RX_SIZE, DMA_FROM_DEVICE);
377out_free_login_desc:
378 kfree(isert_conn->login_desc);
379 return ret;
380}
381
382static void
383isert_set_nego_params(struct isert_conn *isert_conn,
384 struct rdma_conn_param *param)
385{
386 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
387
388 /* Set max inflight RDMA READ requests */
389 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
390 attr->max_qp_init_rd_atom);
391 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
392
393 if (param->private_data) {
394 u8 flags = *(u8 *)param->private_data;
395
396 /*
397 * use remote invalidation if the both initiator
398 * and the HCA support it
399 */
400 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
401 (attr->device_cap_flags &
402 IB_DEVICE_MEM_MGT_EXTENSIONS);
403 if (isert_conn->snd_w_inv)
404 isert_info("Using remote invalidation\n");
405 }
406}
407
408static void
409isert_destroy_qp(struct isert_conn *isert_conn)
410{
411 ib_destroy_qp(isert_conn->qp);
412 ib_cq_pool_put(isert_conn->cq, isert_conn->cq_size);
413}
414
415static int
416isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
417{
418 struct isert_np *isert_np = cma_id->context;
419 struct iscsi_np *np = isert_np->np;
420 struct isert_conn *isert_conn;
421 struct isert_device *device;
422 int ret = 0;
423
424 spin_lock_bh(&np->np_thread_lock);
425 if (!np->enabled) {
426 spin_unlock_bh(&np->np_thread_lock);
427 isert_dbg("iscsi_np is not enabled, reject connect request\n");
428 return rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
429 }
430 spin_unlock_bh(&np->np_thread_lock);
431
432 isert_dbg("cma_id: %p, portal: %p\n",
433 cma_id, cma_id->context);
434
435 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
436 if (!isert_conn)
437 return -ENOMEM;
438
439 isert_init_conn(isert_conn);
440 isert_conn->cm_id = cma_id;
441
442 device = isert_device_get(cma_id);
443 if (IS_ERR(device)) {
444 ret = PTR_ERR(device);
445 goto out;
446 }
447 isert_conn->device = device;
448
449 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
450 if (ret)
451 goto out_conn_dev;
452
453 isert_set_nego_params(isert_conn, &event->param.conn);
454
455 isert_conn->qp = isert_create_qp(isert_conn, cma_id);
456 if (IS_ERR(isert_conn->qp)) {
457 ret = PTR_ERR(isert_conn->qp);
458 goto out_rsp_dma_map;
459 }
460
461 ret = isert_login_post_recv(isert_conn);
462 if (ret)
463 goto out_destroy_qp;
464
465 ret = isert_rdma_accept(isert_conn);
466 if (ret)
467 goto out_destroy_qp;
468
469 mutex_lock(&isert_np->mutex);
470 list_add_tail(&isert_conn->node, &isert_np->accepted);
471 mutex_unlock(&isert_np->mutex);
472
473 return 0;
474
475out_destroy_qp:
476 isert_destroy_qp(isert_conn);
477out_rsp_dma_map:
478 isert_free_login_buf(isert_conn);
479out_conn_dev:
480 isert_device_put(device);
481out:
482 kfree(isert_conn);
483 rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
484 return ret;
485}
486
487static void
488isert_connect_release(struct isert_conn *isert_conn)
489{
490 struct isert_device *device = isert_conn->device;
491
492 isert_dbg("conn %p\n", isert_conn);
493
494 BUG_ON(!device);
495
496 isert_free_rx_descriptors(isert_conn);
497 if (isert_conn->cm_id &&
498 !isert_conn->dev_removed)
499 rdma_destroy_id(isert_conn->cm_id);
500
501 if (isert_conn->qp)
502 isert_destroy_qp(isert_conn);
503
504 if (isert_conn->login_desc)
505 isert_free_login_buf(isert_conn);
506
507 isert_device_put(device);
508
509 if (isert_conn->dev_removed)
510 wake_up_interruptible(&isert_conn->rem_wait);
511 else
512 kfree(isert_conn);
513}
514
515static void
516isert_connected_handler(struct rdma_cm_id *cma_id)
517{
518 struct isert_conn *isert_conn = cma_id->qp->qp_context;
519 struct isert_np *isert_np = cma_id->context;
520
521 isert_info("conn %p\n", isert_conn);
522
523 mutex_lock(&isert_conn->mutex);
524 isert_conn->state = ISER_CONN_UP;
525 kref_get(&isert_conn->kref);
526 mutex_unlock(&isert_conn->mutex);
527
528 mutex_lock(&isert_np->mutex);
529 list_move_tail(&isert_conn->node, &isert_np->pending);
530 mutex_unlock(&isert_np->mutex);
531
532 isert_info("np %p: Allow accept_np to continue\n", isert_np);
533 up(&isert_np->sem);
534}
535
536static void
537isert_release_kref(struct kref *kref)
538{
539 struct isert_conn *isert_conn = container_of(kref,
540 struct isert_conn, kref);
541
542 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
543 current->pid);
544
545 isert_connect_release(isert_conn);
546}
547
548static void
549isert_put_conn(struct isert_conn *isert_conn)
550{
551 kref_put(&isert_conn->kref, isert_release_kref);
552}
553
554static void
555isert_handle_unbound_conn(struct isert_conn *isert_conn)
556{
557 struct isert_np *isert_np = isert_conn->cm_id->context;
558
559 mutex_lock(&isert_np->mutex);
560 if (!list_empty(&isert_conn->node)) {
561 /*
562 * This means iscsi doesn't know this connection
563 * so schedule a cleanup ourselves
564 */
565 list_del_init(&isert_conn->node);
566 isert_put_conn(isert_conn);
567 queue_work(isert_release_wq, &isert_conn->release_work);
568 }
569 mutex_unlock(&isert_np->mutex);
570}
571
572/**
573 * isert_conn_terminate() - Initiate connection termination
574 * @isert_conn: isert connection struct
575 *
576 * Notes:
577 * In case the connection state is BOUND, move state
578 * to TEMINATING and start teardown sequence (rdma_disconnect).
579 * In case the connection state is UP, complete flush as well.
580 *
581 * This routine must be called with mutex held. Thus it is
582 * safe to call multiple times.
583 */
584static void
585isert_conn_terminate(struct isert_conn *isert_conn)
586{
587 int err;
588
589 if (isert_conn->state >= ISER_CONN_TERMINATING)
590 return;
591
592 isert_info("Terminating conn %p state %d\n",
593 isert_conn, isert_conn->state);
594 isert_conn->state = ISER_CONN_TERMINATING;
595 err = rdma_disconnect(isert_conn->cm_id);
596 if (err)
597 isert_warn("Failed rdma_disconnect isert_conn %p\n",
598 isert_conn);
599}
600
601static int
602isert_np_cma_handler(struct isert_np *isert_np,
603 enum rdma_cm_event_type event)
604{
605 isert_dbg("%s (%d): isert np %p\n",
606 rdma_event_msg(event), event, isert_np);
607
608 switch (event) {
609 case RDMA_CM_EVENT_DEVICE_REMOVAL:
610 isert_np->cm_id = NULL;
611 break;
612 case RDMA_CM_EVENT_ADDR_CHANGE:
613 isert_np->cm_id = isert_setup_id(isert_np);
614 if (IS_ERR(isert_np->cm_id)) {
615 isert_err("isert np %p setup id failed: %ld\n",
616 isert_np, PTR_ERR(isert_np->cm_id));
617 isert_np->cm_id = NULL;
618 }
619 break;
620 default:
621 isert_err("isert np %p Unexpected event %d\n",
622 isert_np, event);
623 }
624
625 return -1;
626}
627
628static int
629isert_disconnected_handler(struct rdma_cm_id *cma_id,
630 enum rdma_cm_event_type event)
631{
632 struct isert_conn *isert_conn = cma_id->qp->qp_context;
633
634 mutex_lock(&isert_conn->mutex);
635 switch (isert_conn->state) {
636 case ISER_CONN_TERMINATING:
637 break;
638 case ISER_CONN_UP:
639 isert_conn_terminate(isert_conn);
640 ib_drain_qp(isert_conn->qp);
641 isert_handle_unbound_conn(isert_conn);
642 break;
643 case ISER_CONN_BOUND:
644 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
645 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
646 break;
647 default:
648 isert_warn("conn %p terminating in state %d\n",
649 isert_conn, isert_conn->state);
650 }
651 mutex_unlock(&isert_conn->mutex);
652
653 return 0;
654}
655
656static int
657isert_connect_error(struct rdma_cm_id *cma_id)
658{
659 struct isert_conn *isert_conn = cma_id->qp->qp_context;
660 struct isert_np *isert_np = cma_id->context;
661
662 ib_drain_qp(isert_conn->qp);
663
664 mutex_lock(&isert_np->mutex);
665 list_del_init(&isert_conn->node);
666 mutex_unlock(&isert_np->mutex);
667 isert_conn->cm_id = NULL;
668 isert_put_conn(isert_conn);
669
670 return -1;
671}
672
673static int
674isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
675{
676 struct isert_np *isert_np = cma_id->context;
677 struct isert_conn *isert_conn;
678 int ret = 0;
679
680 isert_info("%s (%d): status %d id %p np %p\n",
681 rdma_event_msg(event->event), event->event,
682 event->status, cma_id, cma_id->context);
683
684 if (isert_np->cm_id == cma_id)
685 return isert_np_cma_handler(cma_id->context, event->event);
686
687 switch (event->event) {
688 case RDMA_CM_EVENT_CONNECT_REQUEST:
689 ret = isert_connect_request(cma_id, event);
690 if (ret)
691 isert_err("failed handle connect request %d\n", ret);
692 break;
693 case RDMA_CM_EVENT_ESTABLISHED:
694 isert_connected_handler(cma_id);
695 break;
696 case RDMA_CM_EVENT_ADDR_CHANGE:
697 case RDMA_CM_EVENT_DISCONNECTED:
698 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
699 ret = isert_disconnected_handler(cma_id, event->event);
700 break;
701 case RDMA_CM_EVENT_DEVICE_REMOVAL:
702 isert_conn = cma_id->qp->qp_context;
703 isert_conn->dev_removed = true;
704 isert_disconnected_handler(cma_id, event->event);
705 wait_event_interruptible(isert_conn->rem_wait,
706 isert_conn->state == ISER_CONN_DOWN);
707 kfree(isert_conn);
708 /*
709 * return non-zero from the callback to destroy
710 * the rdma cm id
711 */
712 return 1;
713 case RDMA_CM_EVENT_REJECTED:
714 isert_info("Connection rejected: %s\n",
715 rdma_reject_msg(cma_id, event->status));
716 fallthrough;
717 case RDMA_CM_EVENT_UNREACHABLE:
718 case RDMA_CM_EVENT_CONNECT_ERROR:
719 ret = isert_connect_error(cma_id);
720 break;
721 default:
722 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
723 break;
724 }
725
726 return ret;
727}
728
729static int
730isert_post_recvm(struct isert_conn *isert_conn, u32 count)
731{
732 struct ib_recv_wr *rx_wr;
733 int i, ret;
734 struct iser_rx_desc *rx_desc;
735
736 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
737 rx_desc = &isert_conn->rx_descs[i];
738
739 rx_wr->wr_cqe = &rx_desc->rx_cqe;
740 rx_wr->sg_list = &rx_desc->rx_sg;
741 rx_wr->num_sge = 1;
742 rx_wr->next = rx_wr + 1;
743 rx_desc->in_use = false;
744 }
745 rx_wr--;
746 rx_wr->next = NULL; /* mark end of work requests list */
747
748 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
749 if (ret)
750 isert_err("ib_post_recv() failed with ret: %d\n", ret);
751
752 return ret;
753}
754
755static int
756isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
757{
758 struct ib_recv_wr rx_wr;
759 int ret;
760
761 if (!rx_desc->in_use) {
762 /*
763 * if the descriptor is not in-use we already reposted it
764 * for recv, so just silently return
765 */
766 return 0;
767 }
768
769 rx_desc->in_use = false;
770 rx_wr.wr_cqe = &rx_desc->rx_cqe;
771 rx_wr.sg_list = &rx_desc->rx_sg;
772 rx_wr.num_sge = 1;
773 rx_wr.next = NULL;
774
775 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
776 if (ret)
777 isert_err("ib_post_recv() failed with ret: %d\n", ret);
778
779 return ret;
780}
781
782static int
783isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
784{
785 struct ib_device *ib_dev = isert_conn->cm_id->device;
786 struct ib_send_wr send_wr;
787 int ret;
788
789 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
790 ISER_HEADERS_LEN, DMA_TO_DEVICE);
791
792 tx_desc->tx_cqe.done = isert_login_send_done;
793
794 send_wr.next = NULL;
795 send_wr.wr_cqe = &tx_desc->tx_cqe;
796 send_wr.sg_list = tx_desc->tx_sg;
797 send_wr.num_sge = tx_desc->num_sge;
798 send_wr.opcode = IB_WR_SEND;
799 send_wr.send_flags = IB_SEND_SIGNALED;
800
801 ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
802 if (ret)
803 isert_err("ib_post_send() failed, ret: %d\n", ret);
804
805 return ret;
806}
807
808static void
809__isert_create_send_desc(struct isert_device *device,
810 struct iser_tx_desc *tx_desc)
811{
812
813 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
814 tx_desc->iser_header.flags = ISCSI_CTRL;
815
816 tx_desc->num_sge = 1;
817
818 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
819 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
820 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
821 }
822}
823
824static void
825isert_create_send_desc(struct isert_conn *isert_conn,
826 struct isert_cmd *isert_cmd,
827 struct iser_tx_desc *tx_desc)
828{
829 struct isert_device *device = isert_conn->device;
830 struct ib_device *ib_dev = device->ib_device;
831
832 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
833 ISER_HEADERS_LEN, DMA_TO_DEVICE);
834
835 __isert_create_send_desc(device, tx_desc);
836}
837
838static int
839isert_init_tx_hdrs(struct isert_conn *isert_conn,
840 struct iser_tx_desc *tx_desc)
841{
842 struct isert_device *device = isert_conn->device;
843 struct ib_device *ib_dev = device->ib_device;
844 u64 dma_addr;
845
846 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
847 ISER_HEADERS_LEN, DMA_TO_DEVICE);
848 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
849 isert_err("ib_dma_mapping_error() failed\n");
850 return -ENOMEM;
851 }
852
853 tx_desc->dma_addr = dma_addr;
854 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
855 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
856 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
857
858 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
859 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
860 tx_desc->tx_sg[0].lkey);
861
862 return 0;
863}
864
865static void
866isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
867 struct ib_send_wr *send_wr)
868{
869 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
870
871 tx_desc->tx_cqe.done = isert_send_done;
872 send_wr->wr_cqe = &tx_desc->tx_cqe;
873
874 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
875 send_wr->opcode = IB_WR_SEND_WITH_INV;
876 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
877 } else {
878 send_wr->opcode = IB_WR_SEND;
879 }
880
881 send_wr->sg_list = &tx_desc->tx_sg[0];
882 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
883 send_wr->send_flags = IB_SEND_SIGNALED;
884}
885
886static int
887isert_login_post_recv(struct isert_conn *isert_conn)
888{
889 struct ib_recv_wr rx_wr;
890 struct ib_sge sge;
891 int ret;
892
893 memset(&sge, 0, sizeof(struct ib_sge));
894 sge.addr = isert_conn->login_desc->dma_addr +
895 isert_get_hdr_offset(isert_conn->login_desc);
896 sge.length = ISER_RX_PAYLOAD_SIZE;
897 sge.lkey = isert_conn->device->pd->local_dma_lkey;
898
899 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
900 sge.addr, sge.length, sge.lkey);
901
902 isert_conn->login_desc->rx_cqe.done = isert_login_recv_done;
903
904 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
905 rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe;
906 rx_wr.sg_list = &sge;
907 rx_wr.num_sge = 1;
908
909 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
910 if (ret)
911 isert_err("ib_post_recv() failed: %d\n", ret);
912
913 return ret;
914}
915
916static int
917isert_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
918 u32 length)
919{
920 struct isert_conn *isert_conn = conn->context;
921 struct isert_device *device = isert_conn->device;
922 struct ib_device *ib_dev = device->ib_device;
923 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
924 int ret;
925
926 __isert_create_send_desc(device, tx_desc);
927
928 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
929 sizeof(struct iscsi_hdr));
930
931 isert_init_tx_hdrs(isert_conn, tx_desc);
932
933 if (length > 0) {
934 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
935
936 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
937 length, DMA_TO_DEVICE);
938
939 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
940
941 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
942 length, DMA_TO_DEVICE);
943
944 tx_dsg->addr = isert_conn->login_rsp_dma;
945 tx_dsg->length = length;
946 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
947 tx_desc->num_sge = 2;
948 }
949 if (!login->login_failed) {
950 if (login->login_complete) {
951 ret = isert_alloc_rx_descriptors(isert_conn);
952 if (ret)
953 return ret;
954
955 ret = isert_post_recvm(isert_conn,
956 ISERT_QP_MAX_RECV_DTOS);
957 if (ret)
958 return ret;
959
960 /* Now we are in FULL_FEATURE phase */
961 mutex_lock(&isert_conn->mutex);
962 isert_conn->state = ISER_CONN_FULL_FEATURE;
963 mutex_unlock(&isert_conn->mutex);
964 goto post_send;
965 }
966
967 ret = isert_login_post_recv(isert_conn);
968 if (ret)
969 return ret;
970 }
971post_send:
972 ret = isert_login_post_send(isert_conn, tx_desc);
973 if (ret)
974 return ret;
975
976 return 0;
977}
978
979static void
980isert_rx_login_req(struct isert_conn *isert_conn)
981{
982 struct iser_rx_desc *rx_desc = isert_conn->login_desc;
983 int rx_buflen = isert_conn->login_req_len;
984 struct iscsit_conn *conn = isert_conn->conn;
985 struct iscsi_login *login = conn->conn_login;
986 int size;
987
988 isert_info("conn %p\n", isert_conn);
989
990 WARN_ON_ONCE(!login);
991
992 if (login->first_request) {
993 struct iscsi_login_req *login_req =
994 (struct iscsi_login_req *)isert_get_iscsi_hdr(rx_desc);
995 /*
996 * Setup the initial iscsi_login values from the leading
997 * login request PDU.
998 */
999 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1000 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
1001 login_req->flags);
1002 login->version_min = login_req->min_version;
1003 login->version_max = login_req->max_version;
1004 memcpy(login->isid, login_req->isid, 6);
1005 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1006 login->init_task_tag = login_req->itt;
1007 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1008 login->cid = be16_to_cpu(login_req->cid);
1009 login->tsih = be16_to_cpu(login_req->tsih);
1010 }
1011
1012 memcpy(&login->req[0], isert_get_iscsi_hdr(rx_desc), ISCSI_HDR_LEN);
1013
1014 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1015 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1016 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1017 MAX_KEY_VALUE_PAIRS);
1018 memcpy(login->req_buf, isert_get_data(rx_desc), size);
1019
1020 if (login->first_request) {
1021 complete(&isert_conn->login_comp);
1022 return;
1023 }
1024 queue_delayed_work(isert_login_wq, &conn->login_work, 0);
1025}
1026
1027static struct iscsit_cmd
1028*isert_allocate_cmd(struct iscsit_conn *conn, struct iser_rx_desc *rx_desc)
1029{
1030 struct isert_conn *isert_conn = conn->context;
1031 struct isert_cmd *isert_cmd;
1032 struct iscsit_cmd *cmd;
1033
1034 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1035 if (!cmd) {
1036 isert_err("Unable to allocate iscsit_cmd + isert_cmd\n");
1037 return NULL;
1038 }
1039 isert_cmd = iscsit_priv_cmd(cmd);
1040 isert_cmd->conn = isert_conn;
1041 isert_cmd->iscsit_cmd = cmd;
1042 isert_cmd->rx_desc = rx_desc;
1043
1044 return cmd;
1045}
1046
1047static int
1048isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1049 struct isert_cmd *isert_cmd, struct iscsit_cmd *cmd,
1050 struct iser_rx_desc *rx_desc, unsigned char *buf)
1051{
1052 struct iscsit_conn *conn = isert_conn->conn;
1053 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1054 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1055 bool dump_payload = false;
1056 unsigned int data_len;
1057
1058 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1059 if (rc < 0)
1060 return rc;
1061
1062 imm_data = cmd->immediate_data;
1063 imm_data_len = cmd->first_burst_len;
1064 unsol_data = cmd->unsolicited_data;
1065 data_len = cmd->se_cmd.data_length;
1066
1067 if (imm_data && imm_data_len == data_len)
1068 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1069 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1070 if (rc < 0) {
1071 return 0;
1072 } else if (rc > 0) {
1073 dump_payload = true;
1074 goto sequence_cmd;
1075 }
1076
1077 if (!imm_data)
1078 return 0;
1079
1080 if (imm_data_len != data_len) {
1081 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1082 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1083 isert_get_data(rx_desc), imm_data_len);
1084 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1085 sg_nents, imm_data_len);
1086 } else {
1087 sg_init_table(&isert_cmd->sg, 1);
1088 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1089 cmd->se_cmd.t_data_nents = 1;
1090 sg_set_buf(&isert_cmd->sg, isert_get_data(rx_desc),
1091 imm_data_len);
1092 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1093 imm_data_len);
1094 }
1095
1096 cmd->write_data_done += imm_data_len;
1097
1098 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1099 spin_lock_bh(&cmd->istate_lock);
1100 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1101 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1102 spin_unlock_bh(&cmd->istate_lock);
1103 }
1104
1105sequence_cmd:
1106 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1107
1108 if (!rc && !dump_payload && unsol_data)
1109 iscsit_set_unsolicited_dataout(cmd);
1110 else if (dump_payload && imm_data)
1111 target_put_sess_cmd(&cmd->se_cmd);
1112
1113 return 0;
1114}
1115
1116static int
1117isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1118 struct iser_rx_desc *rx_desc, unsigned char *buf)
1119{
1120 struct scatterlist *sg_start;
1121 struct iscsit_conn *conn = isert_conn->conn;
1122 struct iscsit_cmd *cmd = NULL;
1123 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1124 u32 unsol_data_len = ntoh24(hdr->dlength);
1125 int rc, sg_nents, sg_off, page_off;
1126
1127 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1128 if (rc < 0)
1129 return rc;
1130 else if (!cmd)
1131 return 0;
1132 /*
1133 * FIXME: Unexpected unsolicited_data out
1134 */
1135 if (!cmd->unsolicited_data) {
1136 isert_err("Received unexpected solicited data payload\n");
1137 dump_stack();
1138 return -1;
1139 }
1140
1141 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1142 "write_data_done: %u, data_length: %u\n",
1143 unsol_data_len, cmd->write_data_done,
1144 cmd->se_cmd.data_length);
1145
1146 sg_off = cmd->write_data_done / PAGE_SIZE;
1147 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1148 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1149 page_off = cmd->write_data_done % PAGE_SIZE;
1150 /*
1151 * FIXME: Non page-aligned unsolicited_data out
1152 */
1153 if (page_off) {
1154 isert_err("unexpected non-page aligned data payload\n");
1155 dump_stack();
1156 return -1;
1157 }
1158 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1159 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1160 sg_nents, isert_get_data(rx_desc), unsol_data_len);
1161
1162 sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),
1163 unsol_data_len);
1164
1165 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1166 if (rc < 0)
1167 return rc;
1168
1169 /*
1170 * multiple data-outs on the same command can arrive -
1171 * so post the buffer before hand
1172 */
1173 return isert_post_recv(isert_conn, rx_desc);
1174}
1175
1176static int
1177isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1178 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1179 unsigned char *buf)
1180{
1181 struct iscsit_conn *conn = isert_conn->conn;
1182 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1183 int rc;
1184
1185 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1186 if (rc < 0)
1187 return rc;
1188 /*
1189 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1190 */
1191
1192 return iscsit_process_nop_out(conn, cmd, hdr);
1193}
1194
1195static int
1196isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1197 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1198 struct iscsi_text *hdr)
1199{
1200 struct iscsit_conn *conn = isert_conn->conn;
1201 u32 payload_length = ntoh24(hdr->dlength);
1202 int rc;
1203 unsigned char *text_in = NULL;
1204
1205 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1206 if (rc < 0)
1207 return rc;
1208
1209 if (payload_length) {
1210 text_in = kzalloc(payload_length, GFP_KERNEL);
1211 if (!text_in)
1212 return -ENOMEM;
1213 }
1214 cmd->text_in_ptr = text_in;
1215
1216 memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), payload_length);
1217
1218 return iscsit_process_text_cmd(conn, cmd, hdr);
1219}
1220
1221static int
1222isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1223 uint32_t read_stag, uint64_t read_va,
1224 uint32_t write_stag, uint64_t write_va)
1225{
1226 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1227 struct iscsit_conn *conn = isert_conn->conn;
1228 struct iscsit_cmd *cmd;
1229 struct isert_cmd *isert_cmd;
1230 int ret = -EINVAL;
1231 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1232
1233 if (conn->sess->sess_ops->SessionType &&
1234 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1235 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1236 " ignoring\n", opcode);
1237 return 0;
1238 }
1239
1240 switch (opcode) {
1241 case ISCSI_OP_SCSI_CMD:
1242 cmd = isert_allocate_cmd(conn, rx_desc);
1243 if (!cmd)
1244 break;
1245
1246 isert_cmd = iscsit_priv_cmd(cmd);
1247 isert_cmd->read_stag = read_stag;
1248 isert_cmd->read_va = read_va;
1249 isert_cmd->write_stag = write_stag;
1250 isert_cmd->write_va = write_va;
1251 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1252
1253 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1254 rx_desc, (unsigned char *)hdr);
1255 break;
1256 case ISCSI_OP_NOOP_OUT:
1257 cmd = isert_allocate_cmd(conn, rx_desc);
1258 if (!cmd)
1259 break;
1260
1261 isert_cmd = iscsit_priv_cmd(cmd);
1262 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1263 rx_desc, (unsigned char *)hdr);
1264 break;
1265 case ISCSI_OP_SCSI_DATA_OUT:
1266 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1267 (unsigned char *)hdr);
1268 break;
1269 case ISCSI_OP_SCSI_TMFUNC:
1270 cmd = isert_allocate_cmd(conn, rx_desc);
1271 if (!cmd)
1272 break;
1273
1274 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1275 (unsigned char *)hdr);
1276 break;
1277 case ISCSI_OP_LOGOUT:
1278 cmd = isert_allocate_cmd(conn, rx_desc);
1279 if (!cmd)
1280 break;
1281
1282 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1283 break;
1284 case ISCSI_OP_TEXT:
1285 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1286 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1287 else
1288 cmd = isert_allocate_cmd(conn, rx_desc);
1289
1290 if (!cmd)
1291 break;
1292
1293 isert_cmd = iscsit_priv_cmd(cmd);
1294 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1295 rx_desc, (struct iscsi_text *)hdr);
1296 break;
1297 default:
1298 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1299 dump_stack();
1300 break;
1301 }
1302
1303 return ret;
1304}
1305
1306static void
1307isert_print_wc(struct ib_wc *wc, const char *type)
1308{
1309 if (wc->status != IB_WC_WR_FLUSH_ERR)
1310 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1311 ib_wc_status_msg(wc->status), wc->status,
1312 wc->vendor_err);
1313 else
1314 isert_dbg("%s failure: %s (%d)\n", type,
1315 ib_wc_status_msg(wc->status), wc->status);
1316}
1317
1318static void
1319isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1320{
1321 struct isert_conn *isert_conn = wc->qp->qp_context;
1322 struct ib_device *ib_dev = isert_conn->cm_id->device;
1323 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1324 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1325 struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(rx_desc);
1326 uint64_t read_va = 0, write_va = 0;
1327 uint32_t read_stag = 0, write_stag = 0;
1328
1329 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1330 isert_print_wc(wc, "recv");
1331 if (wc->status != IB_WC_WR_FLUSH_ERR)
1332 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1333 return;
1334 }
1335
1336 rx_desc->in_use = true;
1337
1338 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1339 ISER_RX_SIZE, DMA_FROM_DEVICE);
1340
1341 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1342 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1343 (int)(wc->byte_len - ISER_HEADERS_LEN));
1344
1345 switch (iser_ctrl->flags & 0xF0) {
1346 case ISCSI_CTRL:
1347 if (iser_ctrl->flags & ISER_RSV) {
1348 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1349 read_va = be64_to_cpu(iser_ctrl->read_va);
1350 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1351 read_stag, (unsigned long long)read_va);
1352 }
1353 if (iser_ctrl->flags & ISER_WSV) {
1354 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1355 write_va = be64_to_cpu(iser_ctrl->write_va);
1356 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1357 write_stag, (unsigned long long)write_va);
1358 }
1359
1360 isert_dbg("ISER ISCSI_CTRL PDU\n");
1361 break;
1362 case ISER_HELLO:
1363 isert_err("iSER Hello message\n");
1364 break;
1365 default:
1366 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1367 break;
1368 }
1369
1370 isert_rx_opcode(isert_conn, rx_desc,
1371 read_stag, read_va, write_stag, write_va);
1372
1373 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1374 ISER_RX_SIZE, DMA_FROM_DEVICE);
1375}
1376
1377static void
1378isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1379{
1380 struct isert_conn *isert_conn = wc->qp->qp_context;
1381 struct ib_device *ib_dev = isert_conn->device->ib_device;
1382
1383 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1384 isert_print_wc(wc, "login recv");
1385 return;
1386 }
1387
1388 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_desc->dma_addr,
1389 ISER_RX_SIZE, DMA_FROM_DEVICE);
1390
1391 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1392
1393 if (isert_conn->conn) {
1394 struct iscsi_login *login = isert_conn->conn->conn_login;
1395
1396 if (login && !login->first_request)
1397 isert_rx_login_req(isert_conn);
1398 }
1399
1400 mutex_lock(&isert_conn->mutex);
1401 complete(&isert_conn->login_req_comp);
1402 mutex_unlock(&isert_conn->mutex);
1403
1404 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_desc->dma_addr,
1405 ISER_RX_SIZE, DMA_FROM_DEVICE);
1406}
1407
1408static void
1409isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1410{
1411 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
1412 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1413
1414 if (!cmd->rw.nr_ops)
1415 return;
1416
1417 if (isert_prot_cmd(conn, se_cmd)) {
1418 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1419 conn->cm_id->port_num, se_cmd->t_data_sg,
1420 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1421 se_cmd->t_prot_nents, dir);
1422 } else {
1423 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1424 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1425 }
1426
1427 cmd->rw.nr_ops = 0;
1428}
1429
1430static void
1431isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1432{
1433 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1434 struct isert_conn *isert_conn = isert_cmd->conn;
1435 struct iscsit_conn *conn = isert_conn->conn;
1436 struct iscsi_text_rsp *hdr;
1437
1438 isert_dbg("Cmd %p\n", isert_cmd);
1439
1440 switch (cmd->iscsi_opcode) {
1441 case ISCSI_OP_SCSI_CMD:
1442 spin_lock_bh(&conn->cmd_lock);
1443 if (!list_empty(&cmd->i_conn_node))
1444 list_del_init(&cmd->i_conn_node);
1445 spin_unlock_bh(&conn->cmd_lock);
1446
1447 if (cmd->data_direction == DMA_TO_DEVICE) {
1448 iscsit_stop_dataout_timer(cmd);
1449 /*
1450 * Check for special case during comp_err where
1451 * WRITE_PENDING has been handed off from core,
1452 * but requires an extra target_put_sess_cmd()
1453 * before transport_generic_free_cmd() below.
1454 */
1455 if (comp_err &&
1456 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1457 struct se_cmd *se_cmd = &cmd->se_cmd;
1458
1459 target_put_sess_cmd(se_cmd);
1460 }
1461 }
1462
1463 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1464 transport_generic_free_cmd(&cmd->se_cmd, 0);
1465 break;
1466 case ISCSI_OP_SCSI_TMFUNC:
1467 spin_lock_bh(&conn->cmd_lock);
1468 if (!list_empty(&cmd->i_conn_node))
1469 list_del_init(&cmd->i_conn_node);
1470 spin_unlock_bh(&conn->cmd_lock);
1471
1472 transport_generic_free_cmd(&cmd->se_cmd, 0);
1473 break;
1474 case ISCSI_OP_REJECT:
1475 case ISCSI_OP_NOOP_OUT:
1476 case ISCSI_OP_TEXT:
1477 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1478 /* If the continue bit is on, keep the command alive */
1479 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1480 break;
1481
1482 spin_lock_bh(&conn->cmd_lock);
1483 if (!list_empty(&cmd->i_conn_node))
1484 list_del_init(&cmd->i_conn_node);
1485 spin_unlock_bh(&conn->cmd_lock);
1486
1487 /*
1488 * Handle special case for REJECT when iscsi_add_reject*() has
1489 * overwritten the original iscsi_opcode assignment, and the
1490 * associated cmd->se_cmd needs to be released.
1491 */
1492 if (cmd->se_cmd.se_tfo != NULL) {
1493 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1494 cmd->iscsi_opcode);
1495 transport_generic_free_cmd(&cmd->se_cmd, 0);
1496 break;
1497 }
1498 fallthrough;
1499 default:
1500 iscsit_release_cmd(cmd);
1501 break;
1502 }
1503}
1504
1505static void
1506isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1507{
1508 if (tx_desc->dma_addr != 0) {
1509 isert_dbg("unmap single for tx_desc->dma_addr\n");
1510 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1511 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1512 tx_desc->dma_addr = 0;
1513 }
1514}
1515
1516static void
1517isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1518 struct ib_device *ib_dev, bool comp_err)
1519{
1520 if (isert_cmd->pdu_buf_dma != 0) {
1521 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1522 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1523 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1524 isert_cmd->pdu_buf_dma = 0;
1525 }
1526
1527 isert_unmap_tx_desc(tx_desc, ib_dev);
1528 isert_put_cmd(isert_cmd, comp_err);
1529}
1530
1531static int
1532isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1533{
1534 struct ib_mr_status mr_status;
1535 int ret;
1536
1537 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1538 if (ret) {
1539 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1540 goto fail_mr_status;
1541 }
1542
1543 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1544 u64 sec_offset_err;
1545 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1546
1547 switch (mr_status.sig_err.err_type) {
1548 case IB_SIG_BAD_GUARD:
1549 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1550 break;
1551 case IB_SIG_BAD_REFTAG:
1552 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1553 break;
1554 case IB_SIG_BAD_APPTAG:
1555 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1556 break;
1557 }
1558 sec_offset_err = mr_status.sig_err.sig_err_offset;
1559 do_div(sec_offset_err, block_size);
1560 se_cmd->sense_info = sec_offset_err + se_cmd->t_task_lba;
1561
1562 isert_err("PI error found type %d at sector 0x%llx "
1563 "expected 0x%x vs actual 0x%x\n",
1564 mr_status.sig_err.err_type,
1565 (unsigned long long)se_cmd->sense_info,
1566 mr_status.sig_err.expected,
1567 mr_status.sig_err.actual);
1568 ret = 1;
1569 }
1570
1571fail_mr_status:
1572 return ret;
1573}
1574
1575static void
1576isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1577{
1578 struct isert_conn *isert_conn = wc->qp->qp_context;
1579 struct isert_device *device = isert_conn->device;
1580 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1581 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1582 struct se_cmd *cmd = &isert_cmd->iscsit_cmd->se_cmd;
1583 int ret = 0;
1584
1585 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1586 isert_print_wc(wc, "rdma write");
1587 if (wc->status != IB_WC_WR_FLUSH_ERR)
1588 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1589 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1590 return;
1591 }
1592
1593 isert_dbg("Cmd %p\n", isert_cmd);
1594
1595 ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr);
1596 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1597
1598 if (ret) {
1599 /*
1600 * transport_generic_request_failure() expects to have
1601 * plus two references to handle queue-full, so re-add
1602 * one here as target-core will have already dropped
1603 * it after the first isert_put_datain() callback.
1604 */
1605 kref_get(&cmd->cmd_kref);
1606 transport_generic_request_failure(cmd, cmd->pi_err);
1607 } else {
1608 /*
1609 * XXX: isert_put_response() failure is not retried.
1610 */
1611 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsit_cmd);
1612 if (ret)
1613 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1614 }
1615}
1616
1617static void
1618isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1619{
1620 struct isert_conn *isert_conn = wc->qp->qp_context;
1621 struct isert_device *device = isert_conn->device;
1622 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1623 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1624 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1625 struct se_cmd *se_cmd = &cmd->se_cmd;
1626 int ret = 0;
1627
1628 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1629 isert_print_wc(wc, "rdma read");
1630 if (wc->status != IB_WC_WR_FLUSH_ERR)
1631 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1632 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1633 return;
1634 }
1635
1636 isert_dbg("Cmd %p\n", isert_cmd);
1637
1638 iscsit_stop_dataout_timer(cmd);
1639
1640 if (isert_prot_cmd(isert_conn, se_cmd))
1641 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
1642 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1643 cmd->write_data_done = 0;
1644
1645 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1646 spin_lock_bh(&cmd->istate_lock);
1647 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649 spin_unlock_bh(&cmd->istate_lock);
1650
1651 /*
1652 * transport_generic_request_failure() will drop the extra
1653 * se_cmd->cmd_kref reference after T10-PI error, and handle
1654 * any non-zero ->queue_status() callback error retries.
1655 */
1656 if (ret)
1657 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1658 else
1659 target_execute_cmd(se_cmd);
1660}
1661
1662static void
1663isert_do_control_comp(struct work_struct *work)
1664{
1665 struct isert_cmd *isert_cmd = container_of(work,
1666 struct isert_cmd, comp_work);
1667 struct isert_conn *isert_conn = isert_cmd->conn;
1668 struct ib_device *ib_dev = isert_conn->cm_id->device;
1669 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1670
1671 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1672
1673 switch (cmd->i_state) {
1674 case ISTATE_SEND_TASKMGTRSP:
1675 iscsit_tmr_post_handler(cmd, cmd->conn);
1676 fallthrough;
1677 case ISTATE_SEND_REJECT:
1678 case ISTATE_SEND_TEXTRSP:
1679 cmd->i_state = ISTATE_SENT_STATUS;
1680 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1681 ib_dev, false);
1682 break;
1683 case ISTATE_SEND_LOGOUTRSP:
1684 iscsit_logout_post_handler(cmd, cmd->conn);
1685 break;
1686 default:
1687 isert_err("Unknown i_state %d\n", cmd->i_state);
1688 dump_stack();
1689 break;
1690 }
1691}
1692
1693static void
1694isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1695{
1696 struct isert_conn *isert_conn = wc->qp->qp_context;
1697 struct ib_device *ib_dev = isert_conn->cm_id->device;
1698 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1699
1700 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1701 isert_print_wc(wc, "login send");
1702 if (wc->status != IB_WC_WR_FLUSH_ERR)
1703 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1704 }
1705
1706 isert_unmap_tx_desc(tx_desc, ib_dev);
1707}
1708
1709static void
1710isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1711{
1712 struct isert_conn *isert_conn = wc->qp->qp_context;
1713 struct ib_device *ib_dev = isert_conn->cm_id->device;
1714 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1715 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1716
1717 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1718 isert_print_wc(wc, "send");
1719 if (wc->status != IB_WC_WR_FLUSH_ERR)
1720 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1721 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1722 return;
1723 }
1724
1725 isert_dbg("Cmd %p\n", isert_cmd);
1726
1727 switch (isert_cmd->iscsit_cmd->i_state) {
1728 case ISTATE_SEND_TASKMGTRSP:
1729 case ISTATE_SEND_LOGOUTRSP:
1730 case ISTATE_SEND_REJECT:
1731 case ISTATE_SEND_TEXTRSP:
1732 isert_unmap_tx_desc(tx_desc, ib_dev);
1733
1734 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1735 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1736 return;
1737 default:
1738 isert_cmd->iscsit_cmd->i_state = ISTATE_SENT_STATUS;
1739 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1740 break;
1741 }
1742}
1743
1744static int
1745isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1746{
1747 int ret;
1748
1749 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1750 if (ret)
1751 return ret;
1752
1753 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1754 if (ret) {
1755 isert_err("ib_post_send failed with %d\n", ret);
1756 return ret;
1757 }
1758 return ret;
1759}
1760
1761static int
1762isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1763{
1764 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1765 struct isert_conn *isert_conn = conn->context;
1766 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1767 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1768 &isert_cmd->tx_desc.iscsi_header;
1769
1770 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1771 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1772 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1773 /*
1774 * Attach SENSE DATA payload to iSCSI Response PDU
1775 */
1776 if (cmd->se_cmd.sense_buffer &&
1777 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1778 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1779 struct isert_device *device = isert_conn->device;
1780 struct ib_device *ib_dev = device->ib_device;
1781 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1782 u32 padding, pdu_len;
1783
1784 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1785 cmd->sense_buffer);
1786 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1787
1788 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1789 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1790 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1791
1792 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1793 (void *)cmd->sense_buffer, pdu_len,
1794 DMA_TO_DEVICE);
1795 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1796 return -ENOMEM;
1797
1798 isert_cmd->pdu_buf_len = pdu_len;
1799 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1800 tx_dsg->length = pdu_len;
1801 tx_dsg->lkey = device->pd->local_dma_lkey;
1802 isert_cmd->tx_desc.num_sge = 2;
1803 }
1804
1805 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1806
1807 isert_dbg("Posting SCSI Response\n");
1808
1809 return isert_post_response(isert_conn, isert_cmd);
1810}
1811
1812static void
1813isert_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1814{
1815 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1816 struct isert_conn *isert_conn = conn->context;
1817
1818 spin_lock_bh(&conn->cmd_lock);
1819 if (!list_empty(&cmd->i_conn_node))
1820 list_del_init(&cmd->i_conn_node);
1821 spin_unlock_bh(&conn->cmd_lock);
1822
1823 if (cmd->data_direction == DMA_TO_DEVICE)
1824 iscsit_stop_dataout_timer(cmd);
1825 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1826}
1827
1828static enum target_prot_op
1829isert_get_sup_prot_ops(struct iscsit_conn *conn)
1830{
1831 struct isert_conn *isert_conn = conn->context;
1832 struct isert_device *device = isert_conn->device;
1833
1834 if (conn->tpg->tpg_attrib.t10_pi) {
1835 if (device->pi_capable) {
1836 isert_info("conn %p PI offload enabled\n", isert_conn);
1837 isert_conn->pi_support = true;
1838 return TARGET_PROT_ALL;
1839 }
1840 }
1841
1842 isert_info("conn %p PI offload disabled\n", isert_conn);
1843 isert_conn->pi_support = false;
1844
1845 return TARGET_PROT_NORMAL;
1846}
1847
1848static int
1849isert_put_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
1850 bool nopout_response)
1851{
1852 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1853 struct isert_conn *isert_conn = conn->context;
1854 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1855
1856 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1857 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1858 &isert_cmd->tx_desc.iscsi_header,
1859 nopout_response);
1860 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1861 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1862
1863 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1864
1865 return isert_post_response(isert_conn, isert_cmd);
1866}
1867
1868static int
1869isert_put_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1870{
1871 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1872 struct isert_conn *isert_conn = conn->context;
1873 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1874
1875 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1876 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1877 &isert_cmd->tx_desc.iscsi_header);
1878 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1879 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1880
1881 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1882
1883 return isert_post_response(isert_conn, isert_cmd);
1884}
1885
1886static int
1887isert_put_tm_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1888{
1889 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1890 struct isert_conn *isert_conn = conn->context;
1891 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1892
1893 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1894 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1895 &isert_cmd->tx_desc.iscsi_header);
1896 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1897 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1898
1899 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1900
1901 return isert_post_response(isert_conn, isert_cmd);
1902}
1903
1904static int
1905isert_put_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1906{
1907 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1908 struct isert_conn *isert_conn = conn->context;
1909 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1910 struct isert_device *device = isert_conn->device;
1911 struct ib_device *ib_dev = device->ib_device;
1912 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1913 struct iscsi_reject *hdr =
1914 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1915
1916 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1917 iscsit_build_reject(cmd, conn, hdr);
1918 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1919
1920 hton24(hdr->dlength, ISCSI_HDR_LEN);
1921 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1922 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1923 DMA_TO_DEVICE);
1924 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1925 return -ENOMEM;
1926 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1927 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1928 tx_dsg->length = ISCSI_HDR_LEN;
1929 tx_dsg->lkey = device->pd->local_dma_lkey;
1930 isert_cmd->tx_desc.num_sge = 2;
1931
1932 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1933
1934 isert_dbg("conn %p Posting Reject\n", isert_conn);
1935
1936 return isert_post_response(isert_conn, isert_cmd);
1937}
1938
1939static int
1940isert_put_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1941{
1942 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1943 struct isert_conn *isert_conn = conn->context;
1944 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1945 struct iscsi_text_rsp *hdr =
1946 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1947 u32 txt_rsp_len;
1948 int rc;
1949
1950 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1951 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1952 if (rc < 0)
1953 return rc;
1954
1955 txt_rsp_len = rc;
1956 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1957
1958 if (txt_rsp_len) {
1959 struct isert_device *device = isert_conn->device;
1960 struct ib_device *ib_dev = device->ib_device;
1961 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1962 void *txt_rsp_buf = cmd->buf_ptr;
1963
1964 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1965 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1966 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1967 return -ENOMEM;
1968
1969 isert_cmd->pdu_buf_len = txt_rsp_len;
1970 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1971 tx_dsg->length = txt_rsp_len;
1972 tx_dsg->lkey = device->pd->local_dma_lkey;
1973 isert_cmd->tx_desc.num_sge = 2;
1974 }
1975 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1976
1977 isert_dbg("conn %p Text Response\n", isert_conn);
1978
1979 return isert_post_response(isert_conn, isert_cmd);
1980}
1981
1982static inline void
1983isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
1984{
1985 domain->sig_type = IB_SIG_TYPE_T10_DIF;
1986 domain->sig.dif.bg_type = IB_T10DIF_CRC;
1987 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
1988 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
1989 /*
1990 * At the moment we hard code those, but if in the future
1991 * the target core would like to use it, we will take it
1992 * from se_cmd.
1993 */
1994 domain->sig.dif.apptag_check_mask = 0xffff;
1995 domain->sig.dif.app_escape = true;
1996 domain->sig.dif.ref_escape = true;
1997 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
1998 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
1999 domain->sig.dif.ref_remap = true;
2000}
2001
2002static int
2003isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2004{
2005 memset(sig_attrs, 0, sizeof(*sig_attrs));
2006
2007 switch (se_cmd->prot_op) {
2008 case TARGET_PROT_DIN_INSERT:
2009 case TARGET_PROT_DOUT_STRIP:
2010 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2011 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2012 break;
2013 case TARGET_PROT_DOUT_INSERT:
2014 case TARGET_PROT_DIN_STRIP:
2015 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2016 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2017 break;
2018 case TARGET_PROT_DIN_PASS:
2019 case TARGET_PROT_DOUT_PASS:
2020 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2021 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2022 break;
2023 default:
2024 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2025 return -EINVAL;
2026 }
2027
2028 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2029 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2030 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2031 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2032 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2033 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2034
2035 return 0;
2036}
2037
2038static int
2039isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2040 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2041{
2042 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
2043 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2044 u8 port_num = conn->cm_id->port_num;
2045 u64 addr;
2046 u32 rkey, offset;
2047 int ret;
2048
2049 if (cmd->ctx_init_done)
2050 goto rdma_ctx_post;
2051
2052 if (dir == DMA_FROM_DEVICE) {
2053 addr = cmd->write_va;
2054 rkey = cmd->write_stag;
2055 offset = cmd->iscsit_cmd->write_data_done;
2056 } else {
2057 addr = cmd->read_va;
2058 rkey = cmd->read_stag;
2059 offset = 0;
2060 }
2061
2062 if (isert_prot_cmd(conn, se_cmd)) {
2063 struct ib_sig_attrs sig_attrs;
2064
2065 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2066 if (ret)
2067 return ret;
2068
2069 WARN_ON_ONCE(offset);
2070 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2071 se_cmd->t_data_sg, se_cmd->t_data_nents,
2072 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2073 &sig_attrs, addr, rkey, dir);
2074 } else {
2075 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2076 se_cmd->t_data_sg, se_cmd->t_data_nents,
2077 offset, addr, rkey, dir);
2078 }
2079
2080 if (ret < 0) {
2081 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2082 return ret;
2083 }
2084
2085 cmd->ctx_init_done = true;
2086
2087rdma_ctx_post:
2088 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2089 if (ret < 0)
2090 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2091 return ret;
2092}
2093
2094static int
2095isert_put_datain(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
2096{
2097 struct se_cmd *se_cmd = &cmd->se_cmd;
2098 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2099 struct isert_conn *isert_conn = conn->context;
2100 struct ib_cqe *cqe = NULL;
2101 struct ib_send_wr *chain_wr = NULL;
2102 int rc;
2103
2104 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2105 isert_cmd, se_cmd->data_length);
2106
2107 if (isert_prot_cmd(isert_conn, se_cmd)) {
2108 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2109 cqe = &isert_cmd->tx_desc.tx_cqe;
2110 } else {
2111 /*
2112 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2113 */
2114 isert_create_send_desc(isert_conn, isert_cmd,
2115 &isert_cmd->tx_desc);
2116 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2117 &isert_cmd->tx_desc.iscsi_header);
2118 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2119 isert_init_send_wr(isert_conn, isert_cmd,
2120 &isert_cmd->tx_desc.send_wr);
2121
2122 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2123 if (rc)
2124 return rc;
2125
2126 chain_wr = &isert_cmd->tx_desc.send_wr;
2127 }
2128
2129 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2130 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2131 isert_cmd, rc);
2132 return rc;
2133}
2134
2135static int
2136isert_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, bool recovery)
2137{
2138 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2139 int ret;
2140
2141 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2142 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2143
2144 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2145 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2146 &isert_cmd->tx_desc.tx_cqe, NULL);
2147
2148 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2149 isert_cmd, ret);
2150 return ret;
2151}
2152
2153static int
2154isert_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2155{
2156 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2157 int ret = 0;
2158
2159 switch (state) {
2160 case ISTATE_REMOVE:
2161 spin_lock_bh(&conn->cmd_lock);
2162 list_del_init(&cmd->i_conn_node);
2163 spin_unlock_bh(&conn->cmd_lock);
2164 isert_put_cmd(isert_cmd, true);
2165 break;
2166 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2167 ret = isert_put_nopin(cmd, conn, false);
2168 break;
2169 default:
2170 isert_err("Unknown immediate state: 0x%02x\n", state);
2171 ret = -EINVAL;
2172 break;
2173 }
2174
2175 return ret;
2176}
2177
2178static int
2179isert_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2180{
2181 struct isert_conn *isert_conn = conn->context;
2182 int ret;
2183
2184 switch (state) {
2185 case ISTATE_SEND_LOGOUTRSP:
2186 ret = isert_put_logout_rsp(cmd, conn);
2187 if (!ret)
2188 isert_conn->logout_posted = true;
2189 break;
2190 case ISTATE_SEND_NOPIN:
2191 ret = isert_put_nopin(cmd, conn, true);
2192 break;
2193 case ISTATE_SEND_TASKMGTRSP:
2194 ret = isert_put_tm_rsp(cmd, conn);
2195 break;
2196 case ISTATE_SEND_REJECT:
2197 ret = isert_put_reject(cmd, conn);
2198 break;
2199 case ISTATE_SEND_TEXTRSP:
2200 ret = isert_put_text_rsp(cmd, conn);
2201 break;
2202 case ISTATE_SEND_STATUS:
2203 /*
2204 * Special case for sending non GOOD SCSI status from TX thread
2205 * context during pre se_cmd excecution failure.
2206 */
2207 ret = isert_put_response(conn, cmd);
2208 break;
2209 default:
2210 isert_err("Unknown response state: 0x%02x\n", state);
2211 ret = -EINVAL;
2212 break;
2213 }
2214
2215 return ret;
2216}
2217
2218struct rdma_cm_id *
2219isert_setup_id(struct isert_np *isert_np)
2220{
2221 struct iscsi_np *np = isert_np->np;
2222 struct rdma_cm_id *id;
2223 struct sockaddr *sa;
2224 int ret;
2225
2226 sa = (struct sockaddr *)&np->np_sockaddr;
2227 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2228
2229 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2230 RDMA_PS_TCP, IB_QPT_RC);
2231 if (IS_ERR(id)) {
2232 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2233 ret = PTR_ERR(id);
2234 goto out;
2235 }
2236 isert_dbg("id %p context %p\n", id, id->context);
2237
2238 /*
2239 * Allow both IPv4 and IPv6 sockets to bind a single port
2240 * at the same time.
2241 */
2242 ret = rdma_set_afonly(id, 1);
2243 if (ret) {
2244 isert_err("rdma_set_afonly() failed: %d\n", ret);
2245 goto out_id;
2246 }
2247
2248 ret = rdma_bind_addr(id, sa);
2249 if (ret) {
2250 isert_err("rdma_bind_addr() failed: %d\n", ret);
2251 goto out_id;
2252 }
2253
2254 ret = rdma_listen(id, 0);
2255 if (ret) {
2256 isert_err("rdma_listen() failed: %d\n", ret);
2257 goto out_id;
2258 }
2259
2260 return id;
2261out_id:
2262 rdma_destroy_id(id);
2263out:
2264 return ERR_PTR(ret);
2265}
2266
2267static int
2268isert_setup_np(struct iscsi_np *np,
2269 struct sockaddr_storage *ksockaddr)
2270{
2271 struct isert_np *isert_np;
2272 struct rdma_cm_id *isert_lid;
2273 int ret;
2274
2275 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2276 if (!isert_np)
2277 return -ENOMEM;
2278
2279 sema_init(&isert_np->sem, 0);
2280 mutex_init(&isert_np->mutex);
2281 INIT_LIST_HEAD(&isert_np->accepted);
2282 INIT_LIST_HEAD(&isert_np->pending);
2283 isert_np->np = np;
2284
2285 /*
2286 * Setup the np->np_sockaddr from the passed sockaddr setup
2287 * in iscsi_target_configfs.c code..
2288 */
2289 memcpy(&np->np_sockaddr, ksockaddr,
2290 sizeof(struct sockaddr_storage));
2291
2292 isert_lid = isert_setup_id(isert_np);
2293 if (IS_ERR(isert_lid)) {
2294 ret = PTR_ERR(isert_lid);
2295 goto out;
2296 }
2297
2298 isert_np->cm_id = isert_lid;
2299 np->np_context = isert_np;
2300
2301 return 0;
2302
2303out:
2304 kfree(isert_np);
2305
2306 return ret;
2307}
2308
2309static int
2310isert_rdma_accept(struct isert_conn *isert_conn)
2311{
2312 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2313 struct rdma_conn_param cp;
2314 int ret;
2315 struct iser_cm_hdr rsp_hdr;
2316
2317 memset(&cp, 0, sizeof(struct rdma_conn_param));
2318 cp.initiator_depth = isert_conn->initiator_depth;
2319 cp.retry_count = 7;
2320 cp.rnr_retry_count = 7;
2321
2322 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2323 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2324 if (!isert_conn->snd_w_inv)
2325 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2326 cp.private_data = (void *)&rsp_hdr;
2327 cp.private_data_len = sizeof(rsp_hdr);
2328
2329 ret = rdma_accept(cm_id, &cp);
2330 if (ret) {
2331 isert_err("rdma_accept() failed with: %d\n", ret);
2332 return ret;
2333 }
2334
2335 return 0;
2336}
2337
2338static int
2339isert_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
2340{
2341 struct isert_conn *isert_conn = conn->context;
2342 int ret;
2343
2344 isert_info("before login_req comp conn: %p\n", isert_conn);
2345 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2346 if (ret) {
2347 isert_err("isert_conn %p interrupted before got login req\n",
2348 isert_conn);
2349 return ret;
2350 }
2351 reinit_completion(&isert_conn->login_req_comp);
2352
2353 /*
2354 * For login requests after the first PDU, isert_rx_login_req() will
2355 * kick queue_delayed_work(isert_login_wq, &conn->login_work) as
2356 * the packet is received, which turns this callback from
2357 * iscsi_target_do_login_rx() into a NOP.
2358 */
2359 if (!login->first_request)
2360 return 0;
2361
2362 isert_rx_login_req(isert_conn);
2363
2364 isert_info("before login_comp conn: %p\n", conn);
2365 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2366 if (ret)
2367 return ret;
2368
2369 isert_info("processing login->req: %p\n", login->req);
2370
2371 return 0;
2372}
2373
2374static void
2375isert_set_conn_info(struct iscsi_np *np, struct iscsit_conn *conn,
2376 struct isert_conn *isert_conn)
2377{
2378 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2379 struct rdma_route *cm_route = &cm_id->route;
2380
2381 conn->login_family = np->np_sockaddr.ss_family;
2382
2383 conn->login_sockaddr = cm_route->addr.dst_addr;
2384 conn->local_sockaddr = cm_route->addr.src_addr;
2385}
2386
2387static int
2388isert_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
2389{
2390 struct isert_np *isert_np = np->np_context;
2391 struct isert_conn *isert_conn;
2392 int ret;
2393
2394accept_wait:
2395 ret = down_interruptible(&isert_np->sem);
2396 if (ret)
2397 return -ENODEV;
2398
2399 spin_lock_bh(&np->np_thread_lock);
2400 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2401 spin_unlock_bh(&np->np_thread_lock);
2402 isert_dbg("np_thread_state %d\n",
2403 np->np_thread_state);
2404 /*
2405 * No point in stalling here when np_thread
2406 * is in state RESET/SHUTDOWN/EXIT - bail
2407 */
2408 return -ENODEV;
2409 }
2410 spin_unlock_bh(&np->np_thread_lock);
2411
2412 mutex_lock(&isert_np->mutex);
2413 if (list_empty(&isert_np->pending)) {
2414 mutex_unlock(&isert_np->mutex);
2415 goto accept_wait;
2416 }
2417 isert_conn = list_first_entry(&isert_np->pending,
2418 struct isert_conn, node);
2419 list_del_init(&isert_conn->node);
2420 mutex_unlock(&isert_np->mutex);
2421
2422 conn->context = isert_conn;
2423 isert_conn->conn = conn;
2424 isert_conn->state = ISER_CONN_BOUND;
2425
2426 isert_set_conn_info(np, conn, isert_conn);
2427
2428 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2429
2430 return 0;
2431}
2432
2433static void
2434isert_free_np(struct iscsi_np *np)
2435{
2436 struct isert_np *isert_np = np->np_context;
2437 struct isert_conn *isert_conn, *n;
2438 LIST_HEAD(drop_conn_list);
2439
2440 if (isert_np->cm_id)
2441 rdma_destroy_id(isert_np->cm_id);
2442
2443 /*
2444 * FIXME: At this point we don't have a good way to insure
2445 * that at this point we don't have hanging connections that
2446 * completed RDMA establishment but didn't start iscsi login
2447 * process. So work-around this by cleaning up what ever piled
2448 * up in accepted and pending lists.
2449 */
2450 mutex_lock(&isert_np->mutex);
2451 if (!list_empty(&isert_np->pending)) {
2452 isert_info("Still have isert pending connections\n");
2453 list_for_each_entry_safe(isert_conn, n,
2454 &isert_np->pending,
2455 node) {
2456 isert_info("cleaning isert_conn %p state (%d)\n",
2457 isert_conn, isert_conn->state);
2458 list_move_tail(&isert_conn->node, &drop_conn_list);
2459 }
2460 }
2461
2462 if (!list_empty(&isert_np->accepted)) {
2463 isert_info("Still have isert accepted connections\n");
2464 list_for_each_entry_safe(isert_conn, n,
2465 &isert_np->accepted,
2466 node) {
2467 isert_info("cleaning isert_conn %p state (%d)\n",
2468 isert_conn, isert_conn->state);
2469 list_move_tail(&isert_conn->node, &drop_conn_list);
2470 }
2471 }
2472 mutex_unlock(&isert_np->mutex);
2473
2474 list_for_each_entry_safe(isert_conn, n, &drop_conn_list, node) {
2475 list_del_init(&isert_conn->node);
2476 isert_connect_release(isert_conn);
2477 }
2478
2479 np->np_context = NULL;
2480 kfree(isert_np);
2481}
2482
2483static void isert_release_work(struct work_struct *work)
2484{
2485 struct isert_conn *isert_conn = container_of(work,
2486 struct isert_conn,
2487 release_work);
2488
2489 isert_info("Starting release conn %p\n", isert_conn);
2490
2491 mutex_lock(&isert_conn->mutex);
2492 isert_conn->state = ISER_CONN_DOWN;
2493 mutex_unlock(&isert_conn->mutex);
2494
2495 isert_info("Destroying conn %p\n", isert_conn);
2496 isert_put_conn(isert_conn);
2497}
2498
2499static void
2500isert_wait4logout(struct isert_conn *isert_conn)
2501{
2502 struct iscsit_conn *conn = isert_conn->conn;
2503
2504 isert_info("conn %p\n", isert_conn);
2505
2506 if (isert_conn->logout_posted) {
2507 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2508 wait_for_completion_timeout(&conn->conn_logout_comp,
2509 SECONDS_FOR_LOGOUT_COMP * HZ);
2510 }
2511}
2512
2513static void
2514isert_wait4cmds(struct iscsit_conn *conn)
2515{
2516 isert_info("iscsit_conn %p\n", conn);
2517
2518 if (conn->sess) {
2519 target_stop_cmd_counter(conn->cmd_cnt);
2520 target_wait_for_cmds(conn->cmd_cnt);
2521 }
2522}
2523
2524/**
2525 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2526 * unsolicitate dataout
2527 * @conn: iscsi connection
2528 *
2529 * We might still have commands that are waiting for unsolicited
2530 * dataouts messages. We must put the extra reference on those
2531 * before blocking on the target_wait_for_session_cmds
2532 */
2533static void
2534isert_put_unsol_pending_cmds(struct iscsit_conn *conn)
2535{
2536 struct iscsit_cmd *cmd, *tmp;
2537 static LIST_HEAD(drop_cmd_list);
2538
2539 spin_lock_bh(&conn->cmd_lock);
2540 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2541 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2542 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2543 (cmd->write_data_done < cmd->se_cmd.data_length))
2544 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2545 }
2546 spin_unlock_bh(&conn->cmd_lock);
2547
2548 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2549 list_del_init(&cmd->i_conn_node);
2550 if (cmd->i_state != ISTATE_REMOVE) {
2551 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2552
2553 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2554 isert_put_cmd(isert_cmd, true);
2555 }
2556 }
2557}
2558
2559static void isert_wait_conn(struct iscsit_conn *conn)
2560{
2561 struct isert_conn *isert_conn = conn->context;
2562
2563 isert_info("Starting conn %p\n", isert_conn);
2564
2565 mutex_lock(&isert_conn->mutex);
2566 isert_conn_terminate(isert_conn);
2567 mutex_unlock(&isert_conn->mutex);
2568
2569 ib_drain_qp(isert_conn->qp);
2570 isert_put_unsol_pending_cmds(conn);
2571 isert_wait4cmds(conn);
2572 isert_wait4logout(isert_conn);
2573
2574 queue_work(isert_release_wq, &isert_conn->release_work);
2575}
2576
2577static void isert_free_conn(struct iscsit_conn *conn)
2578{
2579 struct isert_conn *isert_conn = conn->context;
2580
2581 ib_drain_qp(isert_conn->qp);
2582 isert_put_conn(isert_conn);
2583}
2584
2585static void isert_get_rx_pdu(struct iscsit_conn *conn)
2586{
2587 struct completion comp;
2588
2589 init_completion(&comp);
2590
2591 wait_for_completion_interruptible(&comp);
2592}
2593
2594static struct iscsit_transport iser_target_transport = {
2595 .name = "IB/iSER",
2596 .transport_type = ISCSI_INFINIBAND,
2597 .rdma_shutdown = true,
2598 .priv_size = sizeof(struct isert_cmd),
2599 .owner = THIS_MODULE,
2600 .iscsit_setup_np = isert_setup_np,
2601 .iscsit_accept_np = isert_accept_np,
2602 .iscsit_free_np = isert_free_np,
2603 .iscsit_wait_conn = isert_wait_conn,
2604 .iscsit_free_conn = isert_free_conn,
2605 .iscsit_get_login_rx = isert_get_login_rx,
2606 .iscsit_put_login_tx = isert_put_login_tx,
2607 .iscsit_immediate_queue = isert_immediate_queue,
2608 .iscsit_response_queue = isert_response_queue,
2609 .iscsit_get_dataout = isert_get_dataout,
2610 .iscsit_queue_data_in = isert_put_datain,
2611 .iscsit_queue_status = isert_put_response,
2612 .iscsit_aborted_task = isert_aborted_task,
2613 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2614 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2615};
2616
2617static int __init isert_init(void)
2618{
2619 isert_login_wq = alloc_workqueue("isert_login_wq", 0, 0);
2620 if (!isert_login_wq) {
2621 isert_err("Unable to allocate isert_login_wq\n");
2622 return -ENOMEM;
2623 }
2624
2625 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2626 WQ_UNBOUND | WQ_HIGHPRI, 0);
2627 if (!isert_comp_wq) {
2628 isert_err("Unable to allocate isert_comp_wq\n");
2629 goto destroy_login_wq;
2630 }
2631
2632 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2633 WQ_UNBOUND_MAX_ACTIVE);
2634 if (!isert_release_wq) {
2635 isert_err("Unable to allocate isert_release_wq\n");
2636 goto destroy_comp_wq;
2637 }
2638
2639 iscsit_register_transport(&iser_target_transport);
2640 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2641
2642 return 0;
2643
2644destroy_comp_wq:
2645 destroy_workqueue(isert_comp_wq);
2646destroy_login_wq:
2647 destroy_workqueue(isert_login_wq);
2648
2649 return -ENOMEM;
2650}
2651
2652static void __exit isert_exit(void)
2653{
2654 flush_workqueue(isert_login_wq);
2655 destroy_workqueue(isert_release_wq);
2656 destroy_workqueue(isert_comp_wq);
2657 iscsit_unregister_transport(&iser_target_transport);
2658 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2659 destroy_workqueue(isert_login_wq);
2660}
2661
2662MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2663MODULE_AUTHOR("nab@Linux-iSCSI.org");
2664MODULE_LICENSE("GPL");
2665
2666module_init(isert_init);
2667module_exit(isert_exit);
1/*******************************************************************************
2 * This file contains iSCSI extentions for RDMA (iSER) Verbs
3 *
4 * (c) Copyright 2013 Datera, Inc.
5 *
6 * Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ****************************************************************************/
18
19#include <linux/string.h>
20#include <linux/module.h>
21#include <linux/scatterlist.h>
22#include <linux/socket.h>
23#include <linux/in.h>
24#include <linux/in6.h>
25#include <rdma/ib_verbs.h>
26#include <rdma/rdma_cm.h>
27#include <target/target_core_base.h>
28#include <target/target_core_fabric.h>
29#include <target/iscsi/iscsi_transport.h>
30#include <linux/semaphore.h>
31
32#include "ib_isert.h"
33
34#define ISERT_MAX_CONN 8
35#define ISER_MAX_RX_CQ_LEN (ISERT_QP_MAX_RECV_DTOS * ISERT_MAX_CONN)
36#define ISER_MAX_TX_CQ_LEN \
37 ((ISERT_QP_MAX_REQ_DTOS + ISCSI_DEF_XMIT_CMDS_MAX) * ISERT_MAX_CONN)
38#define ISER_MAX_CQ_LEN (ISER_MAX_RX_CQ_LEN + ISER_MAX_TX_CQ_LEN + \
39 ISERT_MAX_CONN)
40
41static int isert_debug_level;
42module_param_named(debug_level, isert_debug_level, int, 0644);
43MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:0)");
44
45static DEFINE_MUTEX(device_list_mutex);
46static LIST_HEAD(device_list);
47static struct workqueue_struct *isert_comp_wq;
48static struct workqueue_struct *isert_release_wq;
49
50static int
51isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd);
52static int
53isert_login_post_recv(struct isert_conn *isert_conn);
54static int
55isert_rdma_accept(struct isert_conn *isert_conn);
56struct rdma_cm_id *isert_setup_id(struct isert_np *isert_np);
57
58static void isert_release_work(struct work_struct *work);
59static void isert_recv_done(struct ib_cq *cq, struct ib_wc *wc);
60static void isert_send_done(struct ib_cq *cq, struct ib_wc *wc);
61static void isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc);
62static void isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc);
63
64static inline bool
65isert_prot_cmd(struct isert_conn *conn, struct se_cmd *cmd)
66{
67 return (conn->pi_support &&
68 cmd->prot_op != TARGET_PROT_NORMAL);
69}
70
71
72static void
73isert_qp_event_callback(struct ib_event *e, void *context)
74{
75 struct isert_conn *isert_conn = context;
76
77 isert_err("%s (%d): conn %p\n",
78 ib_event_msg(e->event), e->event, isert_conn);
79
80 switch (e->event) {
81 case IB_EVENT_COMM_EST:
82 rdma_notify(isert_conn->cm_id, IB_EVENT_COMM_EST);
83 break;
84 case IB_EVENT_QP_LAST_WQE_REACHED:
85 isert_warn("Reached TX IB_EVENT_QP_LAST_WQE_REACHED\n");
86 break;
87 default:
88 break;
89 }
90}
91
92static struct isert_comp *
93isert_comp_get(struct isert_conn *isert_conn)
94{
95 struct isert_device *device = isert_conn->device;
96 struct isert_comp *comp;
97 int i, min = 0;
98
99 mutex_lock(&device_list_mutex);
100 for (i = 0; i < device->comps_used; i++)
101 if (device->comps[i].active_qps <
102 device->comps[min].active_qps)
103 min = i;
104 comp = &device->comps[min];
105 comp->active_qps++;
106 mutex_unlock(&device_list_mutex);
107
108 isert_info("conn %p, using comp %p min_index: %d\n",
109 isert_conn, comp, min);
110
111 return comp;
112}
113
114static void
115isert_comp_put(struct isert_comp *comp)
116{
117 mutex_lock(&device_list_mutex);
118 comp->active_qps--;
119 mutex_unlock(&device_list_mutex);
120}
121
122static struct ib_qp *
123isert_create_qp(struct isert_conn *isert_conn,
124 struct isert_comp *comp,
125 struct rdma_cm_id *cma_id)
126{
127 struct isert_device *device = isert_conn->device;
128 struct ib_qp_init_attr attr;
129 int ret;
130
131 memset(&attr, 0, sizeof(struct ib_qp_init_attr));
132 attr.event_handler = isert_qp_event_callback;
133 attr.qp_context = isert_conn;
134 attr.send_cq = comp->cq;
135 attr.recv_cq = comp->cq;
136 attr.cap.max_send_wr = ISERT_QP_MAX_REQ_DTOS + 1;
137 attr.cap.max_recv_wr = ISERT_QP_MAX_RECV_DTOS + 1;
138 attr.cap.max_rdma_ctxs = ISCSI_DEF_XMIT_CMDS_MAX;
139 attr.cap.max_send_sge = device->ib_device->attrs.max_sge;
140 attr.cap.max_recv_sge = 1;
141 attr.sq_sig_type = IB_SIGNAL_REQ_WR;
142 attr.qp_type = IB_QPT_RC;
143 if (device->pi_capable)
144 attr.create_flags |= IB_QP_CREATE_SIGNATURE_EN;
145
146 ret = rdma_create_qp(cma_id, device->pd, &attr);
147 if (ret) {
148 isert_err("rdma_create_qp failed for cma_id %d\n", ret);
149 return ERR_PTR(ret);
150 }
151
152 return cma_id->qp;
153}
154
155static int
156isert_conn_setup_qp(struct isert_conn *isert_conn, struct rdma_cm_id *cma_id)
157{
158 struct isert_comp *comp;
159 int ret;
160
161 comp = isert_comp_get(isert_conn);
162 isert_conn->qp = isert_create_qp(isert_conn, comp, cma_id);
163 if (IS_ERR(isert_conn->qp)) {
164 ret = PTR_ERR(isert_conn->qp);
165 goto err;
166 }
167
168 return 0;
169err:
170 isert_comp_put(comp);
171 return ret;
172}
173
174static int
175isert_alloc_rx_descriptors(struct isert_conn *isert_conn)
176{
177 struct isert_device *device = isert_conn->device;
178 struct ib_device *ib_dev = device->ib_device;
179 struct iser_rx_desc *rx_desc;
180 struct ib_sge *rx_sg;
181 u64 dma_addr;
182 int i, j;
183
184 isert_conn->rx_descs = kzalloc(ISERT_QP_MAX_RECV_DTOS *
185 sizeof(struct iser_rx_desc), GFP_KERNEL);
186 if (!isert_conn->rx_descs)
187 return -ENOMEM;
188
189 rx_desc = isert_conn->rx_descs;
190
191 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
192 dma_addr = ib_dma_map_single(ib_dev, (void *)rx_desc,
193 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
194 if (ib_dma_mapping_error(ib_dev, dma_addr))
195 goto dma_map_fail;
196
197 rx_desc->dma_addr = dma_addr;
198
199 rx_sg = &rx_desc->rx_sg;
200 rx_sg->addr = rx_desc->dma_addr;
201 rx_sg->length = ISER_RX_PAYLOAD_SIZE;
202 rx_sg->lkey = device->pd->local_dma_lkey;
203 rx_desc->rx_cqe.done = isert_recv_done;
204 }
205
206 return 0;
207
208dma_map_fail:
209 rx_desc = isert_conn->rx_descs;
210 for (j = 0; j < i; j++, rx_desc++) {
211 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
212 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
213 }
214 kfree(isert_conn->rx_descs);
215 isert_conn->rx_descs = NULL;
216 isert_err("conn %p failed to allocate rx descriptors\n", isert_conn);
217 return -ENOMEM;
218}
219
220static void
221isert_free_rx_descriptors(struct isert_conn *isert_conn)
222{
223 struct ib_device *ib_dev = isert_conn->device->ib_device;
224 struct iser_rx_desc *rx_desc;
225 int i;
226
227 if (!isert_conn->rx_descs)
228 return;
229
230 rx_desc = isert_conn->rx_descs;
231 for (i = 0; i < ISERT_QP_MAX_RECV_DTOS; i++, rx_desc++) {
232 ib_dma_unmap_single(ib_dev, rx_desc->dma_addr,
233 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
234 }
235
236 kfree(isert_conn->rx_descs);
237 isert_conn->rx_descs = NULL;
238}
239
240static void
241isert_free_comps(struct isert_device *device)
242{
243 int i;
244
245 for (i = 0; i < device->comps_used; i++) {
246 struct isert_comp *comp = &device->comps[i];
247
248 if (comp->cq)
249 ib_free_cq(comp->cq);
250 }
251 kfree(device->comps);
252}
253
254static int
255isert_alloc_comps(struct isert_device *device)
256{
257 int i, max_cqe, ret = 0;
258
259 device->comps_used = min(ISERT_MAX_CQ, min_t(int, num_online_cpus(),
260 device->ib_device->num_comp_vectors));
261
262 isert_info("Using %d CQs, %s supports %d vectors support "
263 "pi_capable %d\n",
264 device->comps_used, device->ib_device->name,
265 device->ib_device->num_comp_vectors,
266 device->pi_capable);
267
268 device->comps = kcalloc(device->comps_used, sizeof(struct isert_comp),
269 GFP_KERNEL);
270 if (!device->comps)
271 return -ENOMEM;
272
273 max_cqe = min(ISER_MAX_CQ_LEN, device->ib_device->attrs.max_cqe);
274
275 for (i = 0; i < device->comps_used; i++) {
276 struct isert_comp *comp = &device->comps[i];
277
278 comp->device = device;
279 comp->cq = ib_alloc_cq(device->ib_device, comp, max_cqe, i,
280 IB_POLL_WORKQUEUE);
281 if (IS_ERR(comp->cq)) {
282 isert_err("Unable to allocate cq\n");
283 ret = PTR_ERR(comp->cq);
284 comp->cq = NULL;
285 goto out_cq;
286 }
287 }
288
289 return 0;
290out_cq:
291 isert_free_comps(device);
292 return ret;
293}
294
295static int
296isert_create_device_ib_res(struct isert_device *device)
297{
298 struct ib_device *ib_dev = device->ib_device;
299 int ret;
300
301 isert_dbg("devattr->max_sge: %d\n", ib_dev->attrs.max_sge);
302 isert_dbg("devattr->max_sge_rd: %d\n", ib_dev->attrs.max_sge_rd);
303
304 ret = isert_alloc_comps(device);
305 if (ret)
306 goto out;
307
308 device->pd = ib_alloc_pd(ib_dev, 0);
309 if (IS_ERR(device->pd)) {
310 ret = PTR_ERR(device->pd);
311 isert_err("failed to allocate pd, device %p, ret=%d\n",
312 device, ret);
313 goto out_cq;
314 }
315
316 /* Check signature cap */
317 device->pi_capable = ib_dev->attrs.device_cap_flags &
318 IB_DEVICE_SIGNATURE_HANDOVER ? true : false;
319
320 return 0;
321
322out_cq:
323 isert_free_comps(device);
324out:
325 if (ret > 0)
326 ret = -EINVAL;
327 return ret;
328}
329
330static void
331isert_free_device_ib_res(struct isert_device *device)
332{
333 isert_info("device %p\n", device);
334
335 ib_dealloc_pd(device->pd);
336 isert_free_comps(device);
337}
338
339static void
340isert_device_put(struct isert_device *device)
341{
342 mutex_lock(&device_list_mutex);
343 device->refcount--;
344 isert_info("device %p refcount %d\n", device, device->refcount);
345 if (!device->refcount) {
346 isert_free_device_ib_res(device);
347 list_del(&device->dev_node);
348 kfree(device);
349 }
350 mutex_unlock(&device_list_mutex);
351}
352
353static struct isert_device *
354isert_device_get(struct rdma_cm_id *cma_id)
355{
356 struct isert_device *device;
357 int ret;
358
359 mutex_lock(&device_list_mutex);
360 list_for_each_entry(device, &device_list, dev_node) {
361 if (device->ib_device->node_guid == cma_id->device->node_guid) {
362 device->refcount++;
363 isert_info("Found iser device %p refcount %d\n",
364 device, device->refcount);
365 mutex_unlock(&device_list_mutex);
366 return device;
367 }
368 }
369
370 device = kzalloc(sizeof(struct isert_device), GFP_KERNEL);
371 if (!device) {
372 mutex_unlock(&device_list_mutex);
373 return ERR_PTR(-ENOMEM);
374 }
375
376 INIT_LIST_HEAD(&device->dev_node);
377
378 device->ib_device = cma_id->device;
379 ret = isert_create_device_ib_res(device);
380 if (ret) {
381 kfree(device);
382 mutex_unlock(&device_list_mutex);
383 return ERR_PTR(ret);
384 }
385
386 device->refcount++;
387 list_add_tail(&device->dev_node, &device_list);
388 isert_info("Created a new iser device %p refcount %d\n",
389 device, device->refcount);
390 mutex_unlock(&device_list_mutex);
391
392 return device;
393}
394
395static void
396isert_init_conn(struct isert_conn *isert_conn)
397{
398 isert_conn->state = ISER_CONN_INIT;
399 INIT_LIST_HEAD(&isert_conn->node);
400 init_completion(&isert_conn->login_comp);
401 init_completion(&isert_conn->login_req_comp);
402 init_waitqueue_head(&isert_conn->rem_wait);
403 kref_init(&isert_conn->kref);
404 mutex_init(&isert_conn->mutex);
405 INIT_WORK(&isert_conn->release_work, isert_release_work);
406}
407
408static void
409isert_free_login_buf(struct isert_conn *isert_conn)
410{
411 struct ib_device *ib_dev = isert_conn->device->ib_device;
412
413 ib_dma_unmap_single(ib_dev, isert_conn->login_rsp_dma,
414 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
415 kfree(isert_conn->login_rsp_buf);
416
417 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
418 ISER_RX_PAYLOAD_SIZE,
419 DMA_FROM_DEVICE);
420 kfree(isert_conn->login_req_buf);
421}
422
423static int
424isert_alloc_login_buf(struct isert_conn *isert_conn,
425 struct ib_device *ib_dev)
426{
427 int ret;
428
429 isert_conn->login_req_buf = kzalloc(sizeof(*isert_conn->login_req_buf),
430 GFP_KERNEL);
431 if (!isert_conn->login_req_buf)
432 return -ENOMEM;
433
434 isert_conn->login_req_dma = ib_dma_map_single(ib_dev,
435 isert_conn->login_req_buf,
436 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
437 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_req_dma);
438 if (ret) {
439 isert_err("login_req_dma mapping error: %d\n", ret);
440 isert_conn->login_req_dma = 0;
441 goto out_free_login_req_buf;
442 }
443
444 isert_conn->login_rsp_buf = kzalloc(ISER_RX_PAYLOAD_SIZE, GFP_KERNEL);
445 if (!isert_conn->login_rsp_buf) {
446 ret = -ENOMEM;
447 goto out_unmap_login_req_buf;
448 }
449
450 isert_conn->login_rsp_dma = ib_dma_map_single(ib_dev,
451 isert_conn->login_rsp_buf,
452 ISER_RX_PAYLOAD_SIZE, DMA_TO_DEVICE);
453 ret = ib_dma_mapping_error(ib_dev, isert_conn->login_rsp_dma);
454 if (ret) {
455 isert_err("login_rsp_dma mapping error: %d\n", ret);
456 isert_conn->login_rsp_dma = 0;
457 goto out_free_login_rsp_buf;
458 }
459
460 return 0;
461
462out_free_login_rsp_buf:
463 kfree(isert_conn->login_rsp_buf);
464out_unmap_login_req_buf:
465 ib_dma_unmap_single(ib_dev, isert_conn->login_req_dma,
466 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
467out_free_login_req_buf:
468 kfree(isert_conn->login_req_buf);
469 return ret;
470}
471
472static void
473isert_set_nego_params(struct isert_conn *isert_conn,
474 struct rdma_conn_param *param)
475{
476 struct ib_device_attr *attr = &isert_conn->device->ib_device->attrs;
477
478 /* Set max inflight RDMA READ requests */
479 isert_conn->initiator_depth = min_t(u8, param->initiator_depth,
480 attr->max_qp_init_rd_atom);
481 isert_dbg("Using initiator_depth: %u\n", isert_conn->initiator_depth);
482
483 if (param->private_data) {
484 u8 flags = *(u8 *)param->private_data;
485
486 /*
487 * use remote invalidation if the both initiator
488 * and the HCA support it
489 */
490 isert_conn->snd_w_inv = !(flags & ISER_SEND_W_INV_NOT_SUP) &&
491 (attr->device_cap_flags &
492 IB_DEVICE_MEM_MGT_EXTENSIONS);
493 if (isert_conn->snd_w_inv)
494 isert_info("Using remote invalidation\n");
495 }
496}
497
498static int
499isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
500{
501 struct isert_np *isert_np = cma_id->context;
502 struct iscsi_np *np = isert_np->np;
503 struct isert_conn *isert_conn;
504 struct isert_device *device;
505 int ret = 0;
506
507 spin_lock_bh(&np->np_thread_lock);
508 if (!np->enabled) {
509 spin_unlock_bh(&np->np_thread_lock);
510 isert_dbg("iscsi_np is not enabled, reject connect request\n");
511 return rdma_reject(cma_id, NULL, 0);
512 }
513 spin_unlock_bh(&np->np_thread_lock);
514
515 isert_dbg("cma_id: %p, portal: %p\n",
516 cma_id, cma_id->context);
517
518 isert_conn = kzalloc(sizeof(struct isert_conn), GFP_KERNEL);
519 if (!isert_conn)
520 return -ENOMEM;
521
522 isert_init_conn(isert_conn);
523 isert_conn->cm_id = cma_id;
524
525 ret = isert_alloc_login_buf(isert_conn, cma_id->device);
526 if (ret)
527 goto out;
528
529 device = isert_device_get(cma_id);
530 if (IS_ERR(device)) {
531 ret = PTR_ERR(device);
532 goto out_rsp_dma_map;
533 }
534 isert_conn->device = device;
535
536 isert_set_nego_params(isert_conn, &event->param.conn);
537
538 ret = isert_conn_setup_qp(isert_conn, cma_id);
539 if (ret)
540 goto out_conn_dev;
541
542 ret = isert_login_post_recv(isert_conn);
543 if (ret)
544 goto out_conn_dev;
545
546 ret = isert_rdma_accept(isert_conn);
547 if (ret)
548 goto out_conn_dev;
549
550 mutex_lock(&isert_np->mutex);
551 list_add_tail(&isert_conn->node, &isert_np->accepted);
552 mutex_unlock(&isert_np->mutex);
553
554 return 0;
555
556out_conn_dev:
557 isert_device_put(device);
558out_rsp_dma_map:
559 isert_free_login_buf(isert_conn);
560out:
561 kfree(isert_conn);
562 rdma_reject(cma_id, NULL, 0);
563 return ret;
564}
565
566static void
567isert_connect_release(struct isert_conn *isert_conn)
568{
569 struct isert_device *device = isert_conn->device;
570
571 isert_dbg("conn %p\n", isert_conn);
572
573 BUG_ON(!device);
574
575 isert_free_rx_descriptors(isert_conn);
576 if (isert_conn->cm_id &&
577 !isert_conn->dev_removed)
578 rdma_destroy_id(isert_conn->cm_id);
579
580 if (isert_conn->qp) {
581 struct isert_comp *comp = isert_conn->qp->recv_cq->cq_context;
582
583 isert_comp_put(comp);
584 ib_destroy_qp(isert_conn->qp);
585 }
586
587 if (isert_conn->login_req_buf)
588 isert_free_login_buf(isert_conn);
589
590 isert_device_put(device);
591
592 if (isert_conn->dev_removed)
593 wake_up_interruptible(&isert_conn->rem_wait);
594 else
595 kfree(isert_conn);
596}
597
598static void
599isert_connected_handler(struct rdma_cm_id *cma_id)
600{
601 struct isert_conn *isert_conn = cma_id->qp->qp_context;
602 struct isert_np *isert_np = cma_id->context;
603
604 isert_info("conn %p\n", isert_conn);
605
606 mutex_lock(&isert_conn->mutex);
607 isert_conn->state = ISER_CONN_UP;
608 kref_get(&isert_conn->kref);
609 mutex_unlock(&isert_conn->mutex);
610
611 mutex_lock(&isert_np->mutex);
612 list_move_tail(&isert_conn->node, &isert_np->pending);
613 mutex_unlock(&isert_np->mutex);
614
615 isert_info("np %p: Allow accept_np to continue\n", isert_np);
616 up(&isert_np->sem);
617}
618
619static void
620isert_release_kref(struct kref *kref)
621{
622 struct isert_conn *isert_conn = container_of(kref,
623 struct isert_conn, kref);
624
625 isert_info("conn %p final kref %s/%d\n", isert_conn, current->comm,
626 current->pid);
627
628 isert_connect_release(isert_conn);
629}
630
631static void
632isert_put_conn(struct isert_conn *isert_conn)
633{
634 kref_put(&isert_conn->kref, isert_release_kref);
635}
636
637static void
638isert_handle_unbound_conn(struct isert_conn *isert_conn)
639{
640 struct isert_np *isert_np = isert_conn->cm_id->context;
641
642 mutex_lock(&isert_np->mutex);
643 if (!list_empty(&isert_conn->node)) {
644 /*
645 * This means iscsi doesn't know this connection
646 * so schedule a cleanup ourselves
647 */
648 list_del_init(&isert_conn->node);
649 isert_put_conn(isert_conn);
650 queue_work(isert_release_wq, &isert_conn->release_work);
651 }
652 mutex_unlock(&isert_np->mutex);
653}
654
655/**
656 * isert_conn_terminate() - Initiate connection termination
657 * @isert_conn: isert connection struct
658 *
659 * Notes:
660 * In case the connection state is BOUND, move state
661 * to TEMINATING and start teardown sequence (rdma_disconnect).
662 * In case the connection state is UP, complete flush as well.
663 *
664 * This routine must be called with mutex held. Thus it is
665 * safe to call multiple times.
666 */
667static void
668isert_conn_terminate(struct isert_conn *isert_conn)
669{
670 int err;
671
672 if (isert_conn->state >= ISER_CONN_TERMINATING)
673 return;
674
675 isert_info("Terminating conn %p state %d\n",
676 isert_conn, isert_conn->state);
677 isert_conn->state = ISER_CONN_TERMINATING;
678 err = rdma_disconnect(isert_conn->cm_id);
679 if (err)
680 isert_warn("Failed rdma_disconnect isert_conn %p\n",
681 isert_conn);
682}
683
684static int
685isert_np_cma_handler(struct isert_np *isert_np,
686 enum rdma_cm_event_type event)
687{
688 isert_dbg("%s (%d): isert np %p\n",
689 rdma_event_msg(event), event, isert_np);
690
691 switch (event) {
692 case RDMA_CM_EVENT_DEVICE_REMOVAL:
693 isert_np->cm_id = NULL;
694 break;
695 case RDMA_CM_EVENT_ADDR_CHANGE:
696 isert_np->cm_id = isert_setup_id(isert_np);
697 if (IS_ERR(isert_np->cm_id)) {
698 isert_err("isert np %p setup id failed: %ld\n",
699 isert_np, PTR_ERR(isert_np->cm_id));
700 isert_np->cm_id = NULL;
701 }
702 break;
703 default:
704 isert_err("isert np %p Unexpected event %d\n",
705 isert_np, event);
706 }
707
708 return -1;
709}
710
711static int
712isert_disconnected_handler(struct rdma_cm_id *cma_id,
713 enum rdma_cm_event_type event)
714{
715 struct isert_conn *isert_conn = cma_id->qp->qp_context;
716
717 mutex_lock(&isert_conn->mutex);
718 switch (isert_conn->state) {
719 case ISER_CONN_TERMINATING:
720 break;
721 case ISER_CONN_UP:
722 isert_conn_terminate(isert_conn);
723 ib_drain_qp(isert_conn->qp);
724 isert_handle_unbound_conn(isert_conn);
725 break;
726 case ISER_CONN_BOUND:
727 case ISER_CONN_FULL_FEATURE: /* FALLTHRU */
728 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
729 break;
730 default:
731 isert_warn("conn %p teminating in state %d\n",
732 isert_conn, isert_conn->state);
733 }
734 mutex_unlock(&isert_conn->mutex);
735
736 return 0;
737}
738
739static int
740isert_connect_error(struct rdma_cm_id *cma_id)
741{
742 struct isert_conn *isert_conn = cma_id->qp->qp_context;
743
744 list_del_init(&isert_conn->node);
745 isert_conn->cm_id = NULL;
746 isert_put_conn(isert_conn);
747
748 return -1;
749}
750
751static int
752isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
753{
754 struct isert_np *isert_np = cma_id->context;
755 struct isert_conn *isert_conn;
756 int ret = 0;
757
758 isert_info("%s (%d): status %d id %p np %p\n",
759 rdma_event_msg(event->event), event->event,
760 event->status, cma_id, cma_id->context);
761
762 if (isert_np->cm_id == cma_id)
763 return isert_np_cma_handler(cma_id->context, event->event);
764
765 switch (event->event) {
766 case RDMA_CM_EVENT_CONNECT_REQUEST:
767 ret = isert_connect_request(cma_id, event);
768 if (ret)
769 isert_err("failed handle connect request %d\n", ret);
770 break;
771 case RDMA_CM_EVENT_ESTABLISHED:
772 isert_connected_handler(cma_id);
773 break;
774 case RDMA_CM_EVENT_ADDR_CHANGE: /* FALLTHRU */
775 case RDMA_CM_EVENT_DISCONNECTED: /* FALLTHRU */
776 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
777 ret = isert_disconnected_handler(cma_id, event->event);
778 break;
779 case RDMA_CM_EVENT_DEVICE_REMOVAL:
780 isert_conn = cma_id->qp->qp_context;
781 isert_conn->dev_removed = true;
782 isert_disconnected_handler(cma_id, event->event);
783 wait_event_interruptible(isert_conn->rem_wait,
784 isert_conn->state == ISER_CONN_DOWN);
785 kfree(isert_conn);
786 /*
787 * return non-zero from the callback to destroy
788 * the rdma cm id
789 */
790 return 1;
791 case RDMA_CM_EVENT_REJECTED: /* FALLTHRU */
792 isert_info("Connection rejected: %s\n",
793 rdma_reject_msg(cma_id, event->status));
794 case RDMA_CM_EVENT_UNREACHABLE: /* FALLTHRU */
795 case RDMA_CM_EVENT_CONNECT_ERROR:
796 ret = isert_connect_error(cma_id);
797 break;
798 default:
799 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
800 break;
801 }
802
803 return ret;
804}
805
806static int
807isert_post_recvm(struct isert_conn *isert_conn, u32 count)
808{
809 struct ib_recv_wr *rx_wr, *rx_wr_failed;
810 int i, ret;
811 struct iser_rx_desc *rx_desc;
812
813 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
814 rx_desc = &isert_conn->rx_descs[i];
815
816 rx_wr->wr_cqe = &rx_desc->rx_cqe;
817 rx_wr->sg_list = &rx_desc->rx_sg;
818 rx_wr->num_sge = 1;
819 rx_wr->next = rx_wr + 1;
820 }
821 rx_wr--;
822 rx_wr->next = NULL; /* mark end of work requests list */
823
824 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr,
825 &rx_wr_failed);
826 if (ret)
827 isert_err("ib_post_recv() failed with ret: %d\n", ret);
828
829 return ret;
830}
831
832static int
833isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
834{
835 struct ib_recv_wr *rx_wr_failed, rx_wr;
836 int ret;
837
838 rx_wr.wr_cqe = &rx_desc->rx_cqe;
839 rx_wr.sg_list = &rx_desc->rx_sg;
840 rx_wr.num_sge = 1;
841 rx_wr.next = NULL;
842
843 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_failed);
844 if (ret)
845 isert_err("ib_post_recv() failed with ret: %d\n", ret);
846
847 return ret;
848}
849
850static int
851isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
852{
853 struct ib_device *ib_dev = isert_conn->cm_id->device;
854 struct ib_send_wr send_wr, *send_wr_failed;
855 int ret;
856
857 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
858 ISER_HEADERS_LEN, DMA_TO_DEVICE);
859
860 tx_desc->tx_cqe.done = isert_login_send_done;
861
862 send_wr.next = NULL;
863 send_wr.wr_cqe = &tx_desc->tx_cqe;
864 send_wr.sg_list = tx_desc->tx_sg;
865 send_wr.num_sge = tx_desc->num_sge;
866 send_wr.opcode = IB_WR_SEND;
867 send_wr.send_flags = IB_SEND_SIGNALED;
868
869 ret = ib_post_send(isert_conn->qp, &send_wr, &send_wr_failed);
870 if (ret)
871 isert_err("ib_post_send() failed, ret: %d\n", ret);
872
873 return ret;
874}
875
876static void
877isert_create_send_desc(struct isert_conn *isert_conn,
878 struct isert_cmd *isert_cmd,
879 struct iser_tx_desc *tx_desc)
880{
881 struct isert_device *device = isert_conn->device;
882 struct ib_device *ib_dev = device->ib_device;
883
884 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
885 ISER_HEADERS_LEN, DMA_TO_DEVICE);
886
887 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
888 tx_desc->iser_header.flags = ISCSI_CTRL;
889
890 tx_desc->num_sge = 1;
891
892 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
893 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
894 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
895 }
896}
897
898static int
899isert_init_tx_hdrs(struct isert_conn *isert_conn,
900 struct iser_tx_desc *tx_desc)
901{
902 struct isert_device *device = isert_conn->device;
903 struct ib_device *ib_dev = device->ib_device;
904 u64 dma_addr;
905
906 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
907 ISER_HEADERS_LEN, DMA_TO_DEVICE);
908 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
909 isert_err("ib_dma_mapping_error() failed\n");
910 return -ENOMEM;
911 }
912
913 tx_desc->dma_addr = dma_addr;
914 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
915 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
916 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
917
918 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
919 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
920 tx_desc->tx_sg[0].lkey);
921
922 return 0;
923}
924
925static void
926isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
927 struct ib_send_wr *send_wr)
928{
929 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
930
931 tx_desc->tx_cqe.done = isert_send_done;
932 send_wr->wr_cqe = &tx_desc->tx_cqe;
933
934 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
935 send_wr->opcode = IB_WR_SEND_WITH_INV;
936 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
937 } else {
938 send_wr->opcode = IB_WR_SEND;
939 }
940
941 send_wr->sg_list = &tx_desc->tx_sg[0];
942 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
943 send_wr->send_flags = IB_SEND_SIGNALED;
944}
945
946static int
947isert_login_post_recv(struct isert_conn *isert_conn)
948{
949 struct ib_recv_wr rx_wr, *rx_wr_fail;
950 struct ib_sge sge;
951 int ret;
952
953 memset(&sge, 0, sizeof(struct ib_sge));
954 sge.addr = isert_conn->login_req_dma;
955 sge.length = ISER_RX_PAYLOAD_SIZE;
956 sge.lkey = isert_conn->device->pd->local_dma_lkey;
957
958 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
959 sge.addr, sge.length, sge.lkey);
960
961 isert_conn->login_req_buf->rx_cqe.done = isert_login_recv_done;
962
963 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
964 rx_wr.wr_cqe = &isert_conn->login_req_buf->rx_cqe;
965 rx_wr.sg_list = &sge;
966 rx_wr.num_sge = 1;
967
968 ret = ib_post_recv(isert_conn->qp, &rx_wr, &rx_wr_fail);
969 if (ret)
970 isert_err("ib_post_recv() failed: %d\n", ret);
971
972 return ret;
973}
974
975static int
976isert_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
977 u32 length)
978{
979 struct isert_conn *isert_conn = conn->context;
980 struct isert_device *device = isert_conn->device;
981 struct ib_device *ib_dev = device->ib_device;
982 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
983 int ret;
984
985 isert_create_send_desc(isert_conn, NULL, tx_desc);
986
987 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
988 sizeof(struct iscsi_hdr));
989
990 isert_init_tx_hdrs(isert_conn, tx_desc);
991
992 if (length > 0) {
993 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
994
995 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
996 length, DMA_TO_DEVICE);
997
998 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
999
1000 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
1001 length, DMA_TO_DEVICE);
1002
1003 tx_dsg->addr = isert_conn->login_rsp_dma;
1004 tx_dsg->length = length;
1005 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
1006 tx_desc->num_sge = 2;
1007 }
1008 if (!login->login_failed) {
1009 if (login->login_complete) {
1010 ret = isert_alloc_rx_descriptors(isert_conn);
1011 if (ret)
1012 return ret;
1013
1014 ret = isert_post_recvm(isert_conn,
1015 ISERT_QP_MAX_RECV_DTOS);
1016 if (ret)
1017 return ret;
1018
1019 /* Now we are in FULL_FEATURE phase */
1020 mutex_lock(&isert_conn->mutex);
1021 isert_conn->state = ISER_CONN_FULL_FEATURE;
1022 mutex_unlock(&isert_conn->mutex);
1023 goto post_send;
1024 }
1025
1026 ret = isert_login_post_recv(isert_conn);
1027 if (ret)
1028 return ret;
1029 }
1030post_send:
1031 ret = isert_login_post_send(isert_conn, tx_desc);
1032 if (ret)
1033 return ret;
1034
1035 return 0;
1036}
1037
1038static void
1039isert_rx_login_req(struct isert_conn *isert_conn)
1040{
1041 struct iser_rx_desc *rx_desc = isert_conn->login_req_buf;
1042 int rx_buflen = isert_conn->login_req_len;
1043 struct iscsi_conn *conn = isert_conn->conn;
1044 struct iscsi_login *login = conn->conn_login;
1045 int size;
1046
1047 isert_info("conn %p\n", isert_conn);
1048
1049 WARN_ON_ONCE(!login);
1050
1051 if (login->first_request) {
1052 struct iscsi_login_req *login_req =
1053 (struct iscsi_login_req *)&rx_desc->iscsi_header;
1054 /*
1055 * Setup the initial iscsi_login values from the leading
1056 * login request PDU.
1057 */
1058 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1059 login->current_stage =
1060 (login_req->flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK)
1061 >> 2;
1062 login->version_min = login_req->min_version;
1063 login->version_max = login_req->max_version;
1064 memcpy(login->isid, login_req->isid, 6);
1065 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1066 login->init_task_tag = login_req->itt;
1067 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1068 login->cid = be16_to_cpu(login_req->cid);
1069 login->tsih = be16_to_cpu(login_req->tsih);
1070 }
1071
1072 memcpy(&login->req[0], (void *)&rx_desc->iscsi_header, ISCSI_HDR_LEN);
1073
1074 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1075 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1076 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1077 MAX_KEY_VALUE_PAIRS);
1078 memcpy(login->req_buf, &rx_desc->data[0], size);
1079
1080 if (login->first_request) {
1081 complete(&isert_conn->login_comp);
1082 return;
1083 }
1084 schedule_delayed_work(&conn->login_work, 0);
1085}
1086
1087static struct iscsi_cmd
1088*isert_allocate_cmd(struct iscsi_conn *conn, struct iser_rx_desc *rx_desc)
1089{
1090 struct isert_conn *isert_conn = conn->context;
1091 struct isert_cmd *isert_cmd;
1092 struct iscsi_cmd *cmd;
1093
1094 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1095 if (!cmd) {
1096 isert_err("Unable to allocate iscsi_cmd + isert_cmd\n");
1097 return NULL;
1098 }
1099 isert_cmd = iscsit_priv_cmd(cmd);
1100 isert_cmd->conn = isert_conn;
1101 isert_cmd->iscsi_cmd = cmd;
1102 isert_cmd->rx_desc = rx_desc;
1103
1104 return cmd;
1105}
1106
1107static int
1108isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1109 struct isert_cmd *isert_cmd, struct iscsi_cmd *cmd,
1110 struct iser_rx_desc *rx_desc, unsigned char *buf)
1111{
1112 struct iscsi_conn *conn = isert_conn->conn;
1113 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1114 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1115 bool dump_payload = false;
1116 unsigned int data_len;
1117
1118 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1119 if (rc < 0)
1120 return rc;
1121
1122 imm_data = cmd->immediate_data;
1123 imm_data_len = cmd->first_burst_len;
1124 unsol_data = cmd->unsolicited_data;
1125 data_len = cmd->se_cmd.data_length;
1126
1127 if (imm_data && imm_data_len == data_len)
1128 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1129 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1130 if (rc < 0) {
1131 return 0;
1132 } else if (rc > 0) {
1133 dump_payload = true;
1134 goto sequence_cmd;
1135 }
1136
1137 if (!imm_data)
1138 return 0;
1139
1140 if (imm_data_len != data_len) {
1141 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1142 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1143 &rx_desc->data[0], imm_data_len);
1144 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1145 sg_nents, imm_data_len);
1146 } else {
1147 sg_init_table(&isert_cmd->sg, 1);
1148 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1149 cmd->se_cmd.t_data_nents = 1;
1150 sg_set_buf(&isert_cmd->sg, &rx_desc->data[0], imm_data_len);
1151 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1152 imm_data_len);
1153 }
1154
1155 cmd->write_data_done += imm_data_len;
1156
1157 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1158 spin_lock_bh(&cmd->istate_lock);
1159 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1160 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1161 spin_unlock_bh(&cmd->istate_lock);
1162 }
1163
1164sequence_cmd:
1165 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1166
1167 if (!rc && dump_payload == false && unsol_data)
1168 iscsit_set_unsoliticed_dataout(cmd);
1169 else if (dump_payload && imm_data)
1170 target_put_sess_cmd(&cmd->se_cmd);
1171
1172 return 0;
1173}
1174
1175static int
1176isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1177 struct iser_rx_desc *rx_desc, unsigned char *buf)
1178{
1179 struct scatterlist *sg_start;
1180 struct iscsi_conn *conn = isert_conn->conn;
1181 struct iscsi_cmd *cmd = NULL;
1182 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1183 u32 unsol_data_len = ntoh24(hdr->dlength);
1184 int rc, sg_nents, sg_off, page_off;
1185
1186 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1187 if (rc < 0)
1188 return rc;
1189 else if (!cmd)
1190 return 0;
1191 /*
1192 * FIXME: Unexpected unsolicited_data out
1193 */
1194 if (!cmd->unsolicited_data) {
1195 isert_err("Received unexpected solicited data payload\n");
1196 dump_stack();
1197 return -1;
1198 }
1199
1200 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1201 "write_data_done: %u, data_length: %u\n",
1202 unsol_data_len, cmd->write_data_done,
1203 cmd->se_cmd.data_length);
1204
1205 sg_off = cmd->write_data_done / PAGE_SIZE;
1206 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1207 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1208 page_off = cmd->write_data_done % PAGE_SIZE;
1209 /*
1210 * FIXME: Non page-aligned unsolicited_data out
1211 */
1212 if (page_off) {
1213 isert_err("unexpected non-page aligned data payload\n");
1214 dump_stack();
1215 return -1;
1216 }
1217 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1218 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1219 sg_nents, &rx_desc->data[0], unsol_data_len);
1220
1221 sg_copy_from_buffer(sg_start, sg_nents, &rx_desc->data[0],
1222 unsol_data_len);
1223
1224 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1225 if (rc < 0)
1226 return rc;
1227
1228 /*
1229 * multiple data-outs on the same command can arrive -
1230 * so post the buffer before hand
1231 */
1232 rc = isert_post_recv(isert_conn, rx_desc);
1233 if (rc) {
1234 isert_err("ib_post_recv failed with %d\n", rc);
1235 return rc;
1236 }
1237 return 0;
1238}
1239
1240static int
1241isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1242 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1243 unsigned char *buf)
1244{
1245 struct iscsi_conn *conn = isert_conn->conn;
1246 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1247 int rc;
1248
1249 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1250 if (rc < 0)
1251 return rc;
1252 /*
1253 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1254 */
1255
1256 return iscsit_process_nop_out(conn, cmd, hdr);
1257}
1258
1259static int
1260isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1261 struct iscsi_cmd *cmd, struct iser_rx_desc *rx_desc,
1262 struct iscsi_text *hdr)
1263{
1264 struct iscsi_conn *conn = isert_conn->conn;
1265 u32 payload_length = ntoh24(hdr->dlength);
1266 int rc;
1267 unsigned char *text_in = NULL;
1268
1269 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1270 if (rc < 0)
1271 return rc;
1272
1273 if (payload_length) {
1274 text_in = kzalloc(payload_length, GFP_KERNEL);
1275 if (!text_in)
1276 return -ENOMEM;
1277 }
1278 cmd->text_in_ptr = text_in;
1279
1280 memcpy(cmd->text_in_ptr, &rx_desc->data[0], payload_length);
1281
1282 return iscsit_process_text_cmd(conn, cmd, hdr);
1283}
1284
1285static int
1286isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1287 uint32_t read_stag, uint64_t read_va,
1288 uint32_t write_stag, uint64_t write_va)
1289{
1290 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1291 struct iscsi_conn *conn = isert_conn->conn;
1292 struct iscsi_cmd *cmd;
1293 struct isert_cmd *isert_cmd;
1294 int ret = -EINVAL;
1295 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1296
1297 if (conn->sess->sess_ops->SessionType &&
1298 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1299 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1300 " ignoring\n", opcode);
1301 return 0;
1302 }
1303
1304 switch (opcode) {
1305 case ISCSI_OP_SCSI_CMD:
1306 cmd = isert_allocate_cmd(conn, rx_desc);
1307 if (!cmd)
1308 break;
1309
1310 isert_cmd = iscsit_priv_cmd(cmd);
1311 isert_cmd->read_stag = read_stag;
1312 isert_cmd->read_va = read_va;
1313 isert_cmd->write_stag = write_stag;
1314 isert_cmd->write_va = write_va;
1315 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1316
1317 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1318 rx_desc, (unsigned char *)hdr);
1319 break;
1320 case ISCSI_OP_NOOP_OUT:
1321 cmd = isert_allocate_cmd(conn, rx_desc);
1322 if (!cmd)
1323 break;
1324
1325 isert_cmd = iscsit_priv_cmd(cmd);
1326 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1327 rx_desc, (unsigned char *)hdr);
1328 break;
1329 case ISCSI_OP_SCSI_DATA_OUT:
1330 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1331 (unsigned char *)hdr);
1332 break;
1333 case ISCSI_OP_SCSI_TMFUNC:
1334 cmd = isert_allocate_cmd(conn, rx_desc);
1335 if (!cmd)
1336 break;
1337
1338 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1339 (unsigned char *)hdr);
1340 break;
1341 case ISCSI_OP_LOGOUT:
1342 cmd = isert_allocate_cmd(conn, rx_desc);
1343 if (!cmd)
1344 break;
1345
1346 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1347 break;
1348 case ISCSI_OP_TEXT:
1349 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1350 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1351 else
1352 cmd = isert_allocate_cmd(conn, rx_desc);
1353
1354 if (!cmd)
1355 break;
1356
1357 isert_cmd = iscsit_priv_cmd(cmd);
1358 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1359 rx_desc, (struct iscsi_text *)hdr);
1360 break;
1361 default:
1362 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1363 dump_stack();
1364 break;
1365 }
1366
1367 return ret;
1368}
1369
1370static void
1371isert_print_wc(struct ib_wc *wc, const char *type)
1372{
1373 if (wc->status != IB_WC_WR_FLUSH_ERR)
1374 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1375 ib_wc_status_msg(wc->status), wc->status,
1376 wc->vendor_err);
1377 else
1378 isert_dbg("%s failure: %s (%d)\n", type,
1379 ib_wc_status_msg(wc->status), wc->status);
1380}
1381
1382static void
1383isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1384{
1385 struct isert_conn *isert_conn = wc->qp->qp_context;
1386 struct ib_device *ib_dev = isert_conn->cm_id->device;
1387 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1388 struct iscsi_hdr *hdr = &rx_desc->iscsi_header;
1389 struct iser_ctrl *iser_ctrl = &rx_desc->iser_header;
1390 uint64_t read_va = 0, write_va = 0;
1391 uint32_t read_stag = 0, write_stag = 0;
1392
1393 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1394 isert_print_wc(wc, "recv");
1395 if (wc->status != IB_WC_WR_FLUSH_ERR)
1396 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1397 return;
1398 }
1399
1400 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1401 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1402
1403 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1404 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1405 (int)(wc->byte_len - ISER_HEADERS_LEN));
1406
1407 switch (iser_ctrl->flags & 0xF0) {
1408 case ISCSI_CTRL:
1409 if (iser_ctrl->flags & ISER_RSV) {
1410 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1411 read_va = be64_to_cpu(iser_ctrl->read_va);
1412 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1413 read_stag, (unsigned long long)read_va);
1414 }
1415 if (iser_ctrl->flags & ISER_WSV) {
1416 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1417 write_va = be64_to_cpu(iser_ctrl->write_va);
1418 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1419 write_stag, (unsigned long long)write_va);
1420 }
1421
1422 isert_dbg("ISER ISCSI_CTRL PDU\n");
1423 break;
1424 case ISER_HELLO:
1425 isert_err("iSER Hello message\n");
1426 break;
1427 default:
1428 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1429 break;
1430 }
1431
1432 isert_rx_opcode(isert_conn, rx_desc,
1433 read_stag, read_va, write_stag, write_va);
1434
1435 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1436 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1437}
1438
1439static void
1440isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1441{
1442 struct isert_conn *isert_conn = wc->qp->qp_context;
1443 struct ib_device *ib_dev = isert_conn->cm_id->device;
1444
1445 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1446 isert_print_wc(wc, "login recv");
1447 return;
1448 }
1449
1450 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_req_dma,
1451 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1452
1453 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1454
1455 if (isert_conn->conn) {
1456 struct iscsi_login *login = isert_conn->conn->conn_login;
1457
1458 if (login && !login->first_request)
1459 isert_rx_login_req(isert_conn);
1460 }
1461
1462 mutex_lock(&isert_conn->mutex);
1463 complete(&isert_conn->login_req_comp);
1464 mutex_unlock(&isert_conn->mutex);
1465
1466 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_req_dma,
1467 ISER_RX_PAYLOAD_SIZE, DMA_FROM_DEVICE);
1468}
1469
1470static void
1471isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1472{
1473 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
1474 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1475
1476 if (!cmd->rw.nr_ops)
1477 return;
1478
1479 if (isert_prot_cmd(conn, se_cmd)) {
1480 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1481 conn->cm_id->port_num, se_cmd->t_data_sg,
1482 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1483 se_cmd->t_prot_nents, dir);
1484 } else {
1485 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1486 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1487 }
1488
1489 cmd->rw.nr_ops = 0;
1490}
1491
1492static void
1493isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1494{
1495 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1496 struct isert_conn *isert_conn = isert_cmd->conn;
1497 struct iscsi_conn *conn = isert_conn->conn;
1498 struct iscsi_text_rsp *hdr;
1499
1500 isert_dbg("Cmd %p\n", isert_cmd);
1501
1502 switch (cmd->iscsi_opcode) {
1503 case ISCSI_OP_SCSI_CMD:
1504 spin_lock_bh(&conn->cmd_lock);
1505 if (!list_empty(&cmd->i_conn_node))
1506 list_del_init(&cmd->i_conn_node);
1507 spin_unlock_bh(&conn->cmd_lock);
1508
1509 if (cmd->data_direction == DMA_TO_DEVICE) {
1510 iscsit_stop_dataout_timer(cmd);
1511 /*
1512 * Check for special case during comp_err where
1513 * WRITE_PENDING has been handed off from core,
1514 * but requires an extra target_put_sess_cmd()
1515 * before transport_generic_free_cmd() below.
1516 */
1517 if (comp_err &&
1518 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1519 struct se_cmd *se_cmd = &cmd->se_cmd;
1520
1521 target_put_sess_cmd(se_cmd);
1522 }
1523 }
1524
1525 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1526 transport_generic_free_cmd(&cmd->se_cmd, 0);
1527 break;
1528 case ISCSI_OP_SCSI_TMFUNC:
1529 spin_lock_bh(&conn->cmd_lock);
1530 if (!list_empty(&cmd->i_conn_node))
1531 list_del_init(&cmd->i_conn_node);
1532 spin_unlock_bh(&conn->cmd_lock);
1533
1534 transport_generic_free_cmd(&cmd->se_cmd, 0);
1535 break;
1536 case ISCSI_OP_REJECT:
1537 case ISCSI_OP_NOOP_OUT:
1538 case ISCSI_OP_TEXT:
1539 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1540 /* If the continue bit is on, keep the command alive */
1541 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1542 break;
1543
1544 spin_lock_bh(&conn->cmd_lock);
1545 if (!list_empty(&cmd->i_conn_node))
1546 list_del_init(&cmd->i_conn_node);
1547 spin_unlock_bh(&conn->cmd_lock);
1548
1549 /*
1550 * Handle special case for REJECT when iscsi_add_reject*() has
1551 * overwritten the original iscsi_opcode assignment, and the
1552 * associated cmd->se_cmd needs to be released.
1553 */
1554 if (cmd->se_cmd.se_tfo != NULL) {
1555 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1556 cmd->iscsi_opcode);
1557 transport_generic_free_cmd(&cmd->se_cmd, 0);
1558 break;
1559 }
1560 /*
1561 * Fall-through
1562 */
1563 default:
1564 iscsit_release_cmd(cmd);
1565 break;
1566 }
1567}
1568
1569static void
1570isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1571{
1572 if (tx_desc->dma_addr != 0) {
1573 isert_dbg("unmap single for tx_desc->dma_addr\n");
1574 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1575 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1576 tx_desc->dma_addr = 0;
1577 }
1578}
1579
1580static void
1581isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1582 struct ib_device *ib_dev, bool comp_err)
1583{
1584 if (isert_cmd->pdu_buf_dma != 0) {
1585 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1586 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1587 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1588 isert_cmd->pdu_buf_dma = 0;
1589 }
1590
1591 isert_unmap_tx_desc(tx_desc, ib_dev);
1592 isert_put_cmd(isert_cmd, comp_err);
1593}
1594
1595static int
1596isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1597{
1598 struct ib_mr_status mr_status;
1599 int ret;
1600
1601 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1602 if (ret) {
1603 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1604 goto fail_mr_status;
1605 }
1606
1607 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1608 u64 sec_offset_err;
1609 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1610
1611 switch (mr_status.sig_err.err_type) {
1612 case IB_SIG_BAD_GUARD:
1613 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1614 break;
1615 case IB_SIG_BAD_REFTAG:
1616 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1617 break;
1618 case IB_SIG_BAD_APPTAG:
1619 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1620 break;
1621 }
1622 sec_offset_err = mr_status.sig_err.sig_err_offset;
1623 do_div(sec_offset_err, block_size);
1624 se_cmd->bad_sector = sec_offset_err + se_cmd->t_task_lba;
1625
1626 isert_err("PI error found type %d at sector 0x%llx "
1627 "expected 0x%x vs actual 0x%x\n",
1628 mr_status.sig_err.err_type,
1629 (unsigned long long)se_cmd->bad_sector,
1630 mr_status.sig_err.expected,
1631 mr_status.sig_err.actual);
1632 ret = 1;
1633 }
1634
1635fail_mr_status:
1636 return ret;
1637}
1638
1639static void
1640isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1641{
1642 struct isert_conn *isert_conn = wc->qp->qp_context;
1643 struct isert_device *device = isert_conn->device;
1644 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1645 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1646 struct se_cmd *cmd = &isert_cmd->iscsi_cmd->se_cmd;
1647 int ret = 0;
1648
1649 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1650 isert_print_wc(wc, "rdma write");
1651 if (wc->status != IB_WC_WR_FLUSH_ERR)
1652 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1653 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1654 return;
1655 }
1656
1657 isert_dbg("Cmd %p\n", isert_cmd);
1658
1659 ret = isert_check_pi_status(cmd, isert_cmd->rw.sig->sig_mr);
1660 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1661
1662 if (ret)
1663 transport_send_check_condition_and_sense(cmd, cmd->pi_err, 0);
1664 else
1665 isert_put_response(isert_conn->conn, isert_cmd->iscsi_cmd);
1666}
1667
1668static void
1669isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1670{
1671 struct isert_conn *isert_conn = wc->qp->qp_context;
1672 struct isert_device *device = isert_conn->device;
1673 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1674 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1675 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1676 struct se_cmd *se_cmd = &cmd->se_cmd;
1677 int ret = 0;
1678
1679 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1680 isert_print_wc(wc, "rdma read");
1681 if (wc->status != IB_WC_WR_FLUSH_ERR)
1682 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1683 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1684 return;
1685 }
1686
1687 isert_dbg("Cmd %p\n", isert_cmd);
1688
1689 iscsit_stop_dataout_timer(cmd);
1690
1691 if (isert_prot_cmd(isert_conn, se_cmd))
1692 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.sig->sig_mr);
1693 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1694 cmd->write_data_done = 0;
1695
1696 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1697 spin_lock_bh(&cmd->istate_lock);
1698 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1699 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1700 spin_unlock_bh(&cmd->istate_lock);
1701
1702 if (ret) {
1703 target_put_sess_cmd(se_cmd);
1704 transport_send_check_condition_and_sense(se_cmd,
1705 se_cmd->pi_err, 0);
1706 } else {
1707 target_execute_cmd(se_cmd);
1708 }
1709}
1710
1711static void
1712isert_do_control_comp(struct work_struct *work)
1713{
1714 struct isert_cmd *isert_cmd = container_of(work,
1715 struct isert_cmd, comp_work);
1716 struct isert_conn *isert_conn = isert_cmd->conn;
1717 struct ib_device *ib_dev = isert_conn->cm_id->device;
1718 struct iscsi_cmd *cmd = isert_cmd->iscsi_cmd;
1719
1720 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1721
1722 switch (cmd->i_state) {
1723 case ISTATE_SEND_TASKMGTRSP:
1724 iscsit_tmr_post_handler(cmd, cmd->conn);
1725 case ISTATE_SEND_REJECT: /* FALLTHRU */
1726 case ISTATE_SEND_TEXTRSP: /* FALLTHRU */
1727 cmd->i_state = ISTATE_SENT_STATUS;
1728 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1729 ib_dev, false);
1730 break;
1731 case ISTATE_SEND_LOGOUTRSP:
1732 iscsit_logout_post_handler(cmd, cmd->conn);
1733 break;
1734 default:
1735 isert_err("Unknown i_state %d\n", cmd->i_state);
1736 dump_stack();
1737 break;
1738 }
1739}
1740
1741static void
1742isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1743{
1744 struct isert_conn *isert_conn = wc->qp->qp_context;
1745 struct ib_device *ib_dev = isert_conn->cm_id->device;
1746 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1747
1748 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1749 isert_print_wc(wc, "login send");
1750 if (wc->status != IB_WC_WR_FLUSH_ERR)
1751 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1752 }
1753
1754 isert_unmap_tx_desc(tx_desc, ib_dev);
1755}
1756
1757static void
1758isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1759{
1760 struct isert_conn *isert_conn = wc->qp->qp_context;
1761 struct ib_device *ib_dev = isert_conn->cm_id->device;
1762 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1763 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1764
1765 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1766 isert_print_wc(wc, "send");
1767 if (wc->status != IB_WC_WR_FLUSH_ERR)
1768 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1769 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1770 return;
1771 }
1772
1773 isert_dbg("Cmd %p\n", isert_cmd);
1774
1775 switch (isert_cmd->iscsi_cmd->i_state) {
1776 case ISTATE_SEND_TASKMGTRSP:
1777 case ISTATE_SEND_LOGOUTRSP:
1778 case ISTATE_SEND_REJECT:
1779 case ISTATE_SEND_TEXTRSP:
1780 isert_unmap_tx_desc(tx_desc, ib_dev);
1781
1782 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1783 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1784 return;
1785 default:
1786 isert_cmd->iscsi_cmd->i_state = ISTATE_SENT_STATUS;
1787 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1788 break;
1789 }
1790}
1791
1792static int
1793isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1794{
1795 struct ib_send_wr *wr_failed;
1796 int ret;
1797
1798 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1799 if (ret) {
1800 isert_err("ib_post_recv failed with %d\n", ret);
1801 return ret;
1802 }
1803
1804 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr,
1805 &wr_failed);
1806 if (ret) {
1807 isert_err("ib_post_send failed with %d\n", ret);
1808 return ret;
1809 }
1810 return ret;
1811}
1812
1813static int
1814isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1815{
1816 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1817 struct isert_conn *isert_conn = conn->context;
1818 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1819 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1820 &isert_cmd->tx_desc.iscsi_header;
1821
1822 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1823 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1824 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1825 /*
1826 * Attach SENSE DATA payload to iSCSI Response PDU
1827 */
1828 if (cmd->se_cmd.sense_buffer &&
1829 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1830 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1831 struct isert_device *device = isert_conn->device;
1832 struct ib_device *ib_dev = device->ib_device;
1833 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1834 u32 padding, pdu_len;
1835
1836 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1837 cmd->sense_buffer);
1838 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1839
1840 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1841 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1842 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1843
1844 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1845 (void *)cmd->sense_buffer, pdu_len,
1846 DMA_TO_DEVICE);
1847 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1848 return -ENOMEM;
1849
1850 isert_cmd->pdu_buf_len = pdu_len;
1851 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1852 tx_dsg->length = pdu_len;
1853 tx_dsg->lkey = device->pd->local_dma_lkey;
1854 isert_cmd->tx_desc.num_sge = 2;
1855 }
1856
1857 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1858
1859 isert_dbg("Posting SCSI Response\n");
1860
1861 return isert_post_response(isert_conn, isert_cmd);
1862}
1863
1864static void
1865isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
1866{
1867 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1868 struct isert_conn *isert_conn = conn->context;
1869
1870 spin_lock_bh(&conn->cmd_lock);
1871 if (!list_empty(&cmd->i_conn_node))
1872 list_del_init(&cmd->i_conn_node);
1873 spin_unlock_bh(&conn->cmd_lock);
1874
1875 if (cmd->data_direction == DMA_TO_DEVICE)
1876 iscsit_stop_dataout_timer(cmd);
1877 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1878}
1879
1880static enum target_prot_op
1881isert_get_sup_prot_ops(struct iscsi_conn *conn)
1882{
1883 struct isert_conn *isert_conn = conn->context;
1884 struct isert_device *device = isert_conn->device;
1885
1886 if (conn->tpg->tpg_attrib.t10_pi) {
1887 if (device->pi_capable) {
1888 isert_info("conn %p PI offload enabled\n", isert_conn);
1889 isert_conn->pi_support = true;
1890 return TARGET_PROT_ALL;
1891 }
1892 }
1893
1894 isert_info("conn %p PI offload disabled\n", isert_conn);
1895 isert_conn->pi_support = false;
1896
1897 return TARGET_PROT_NORMAL;
1898}
1899
1900static int
1901isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
1902 bool nopout_response)
1903{
1904 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1905 struct isert_conn *isert_conn = conn->context;
1906 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1907
1908 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1909 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1910 &isert_cmd->tx_desc.iscsi_header,
1911 nopout_response);
1912 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1913 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1914
1915 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1916
1917 return isert_post_response(isert_conn, isert_cmd);
1918}
1919
1920static int
1921isert_put_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1922{
1923 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1924 struct isert_conn *isert_conn = conn->context;
1925 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1926
1927 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1928 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1929 &isert_cmd->tx_desc.iscsi_header);
1930 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1931 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1932
1933 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1934
1935 return isert_post_response(isert_conn, isert_cmd);
1936}
1937
1938static int
1939isert_put_tm_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1940{
1941 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1942 struct isert_conn *isert_conn = conn->context;
1943 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1944
1945 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1946 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1947 &isert_cmd->tx_desc.iscsi_header);
1948 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1949 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1950
1951 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1952
1953 return isert_post_response(isert_conn, isert_cmd);
1954}
1955
1956static int
1957isert_put_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1958{
1959 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1960 struct isert_conn *isert_conn = conn->context;
1961 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1962 struct isert_device *device = isert_conn->device;
1963 struct ib_device *ib_dev = device->ib_device;
1964 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1965 struct iscsi_reject *hdr =
1966 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1967
1968 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1969 iscsit_build_reject(cmd, conn, hdr);
1970 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1971
1972 hton24(hdr->dlength, ISCSI_HDR_LEN);
1973 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1974 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1975 DMA_TO_DEVICE);
1976 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1977 return -ENOMEM;
1978 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1979 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1980 tx_dsg->length = ISCSI_HDR_LEN;
1981 tx_dsg->lkey = device->pd->local_dma_lkey;
1982 isert_cmd->tx_desc.num_sge = 2;
1983
1984 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1985
1986 isert_dbg("conn %p Posting Reject\n", isert_conn);
1987
1988 return isert_post_response(isert_conn, isert_cmd);
1989}
1990
1991static int
1992isert_put_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1993{
1994 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1995 struct isert_conn *isert_conn = conn->context;
1996 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1997 struct iscsi_text_rsp *hdr =
1998 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1999 u32 txt_rsp_len;
2000 int rc;
2001
2002 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
2003 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
2004 if (rc < 0)
2005 return rc;
2006
2007 txt_rsp_len = rc;
2008 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2009
2010 if (txt_rsp_len) {
2011 struct isert_device *device = isert_conn->device;
2012 struct ib_device *ib_dev = device->ib_device;
2013 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
2014 void *txt_rsp_buf = cmd->buf_ptr;
2015
2016 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
2017 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
2018 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
2019 return -ENOMEM;
2020
2021 isert_cmd->pdu_buf_len = txt_rsp_len;
2022 tx_dsg->addr = isert_cmd->pdu_buf_dma;
2023 tx_dsg->length = txt_rsp_len;
2024 tx_dsg->lkey = device->pd->local_dma_lkey;
2025 isert_cmd->tx_desc.num_sge = 2;
2026 }
2027 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
2028
2029 isert_dbg("conn %p Text Response\n", isert_conn);
2030
2031 return isert_post_response(isert_conn, isert_cmd);
2032}
2033
2034static inline void
2035isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs,
2036 struct ib_sig_domain *domain)
2037{
2038 domain->sig_type = IB_SIG_TYPE_T10_DIF;
2039 domain->sig.dif.bg_type = IB_T10DIF_CRC;
2040 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
2041 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
2042 /*
2043 * At the moment we hard code those, but if in the future
2044 * the target core would like to use it, we will take it
2045 * from se_cmd.
2046 */
2047 domain->sig.dif.apptag_check_mask = 0xffff;
2048 domain->sig.dif.app_escape = true;
2049 domain->sig.dif.ref_escape = true;
2050 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
2051 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
2052 domain->sig.dif.ref_remap = true;
2053};
2054
2055static int
2056isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2057{
2058 memset(sig_attrs, 0, sizeof(*sig_attrs));
2059
2060 switch (se_cmd->prot_op) {
2061 case TARGET_PROT_DIN_INSERT:
2062 case TARGET_PROT_DOUT_STRIP:
2063 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2064 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2065 break;
2066 case TARGET_PROT_DOUT_INSERT:
2067 case TARGET_PROT_DIN_STRIP:
2068 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2069 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2070 break;
2071 case TARGET_PROT_DIN_PASS:
2072 case TARGET_PROT_DOUT_PASS:
2073 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->wire);
2074 isert_set_dif_domain(se_cmd, sig_attrs, &sig_attrs->mem);
2075 break;
2076 default:
2077 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2078 return -EINVAL;
2079 }
2080
2081 sig_attrs->check_mask =
2082 (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD ? 0xc0 : 0) |
2083 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x30 : 0) |
2084 (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG ? 0x0f : 0);
2085 return 0;
2086}
2087
2088static int
2089isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2090 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2091{
2092 struct se_cmd *se_cmd = &cmd->iscsi_cmd->se_cmd;
2093 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2094 u8 port_num = conn->cm_id->port_num;
2095 u64 addr;
2096 u32 rkey, offset;
2097 int ret;
2098
2099 if (dir == DMA_FROM_DEVICE) {
2100 addr = cmd->write_va;
2101 rkey = cmd->write_stag;
2102 offset = cmd->iscsi_cmd->write_data_done;
2103 } else {
2104 addr = cmd->read_va;
2105 rkey = cmd->read_stag;
2106 offset = 0;
2107 }
2108
2109 if (isert_prot_cmd(conn, se_cmd)) {
2110 struct ib_sig_attrs sig_attrs;
2111
2112 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2113 if (ret)
2114 return ret;
2115
2116 WARN_ON_ONCE(offset);
2117 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2118 se_cmd->t_data_sg, se_cmd->t_data_nents,
2119 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2120 &sig_attrs, addr, rkey, dir);
2121 } else {
2122 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2123 se_cmd->t_data_sg, se_cmd->t_data_nents,
2124 offset, addr, rkey, dir);
2125 }
2126 if (ret < 0) {
2127 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2128 return ret;
2129 }
2130
2131 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2132 if (ret < 0)
2133 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2134 return ret;
2135}
2136
2137static int
2138isert_put_datain(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
2139{
2140 struct se_cmd *se_cmd = &cmd->se_cmd;
2141 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2142 struct isert_conn *isert_conn = conn->context;
2143 struct ib_cqe *cqe = NULL;
2144 struct ib_send_wr *chain_wr = NULL;
2145 int rc;
2146
2147 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2148 isert_cmd, se_cmd->data_length);
2149
2150 if (isert_prot_cmd(isert_conn, se_cmd)) {
2151 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2152 cqe = &isert_cmd->tx_desc.tx_cqe;
2153 } else {
2154 /*
2155 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2156 */
2157 isert_create_send_desc(isert_conn, isert_cmd,
2158 &isert_cmd->tx_desc);
2159 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2160 &isert_cmd->tx_desc.iscsi_header);
2161 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2162 isert_init_send_wr(isert_conn, isert_cmd,
2163 &isert_cmd->tx_desc.send_wr);
2164
2165 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2166 if (rc) {
2167 isert_err("ib_post_recv failed with %d\n", rc);
2168 return rc;
2169 }
2170
2171 chain_wr = &isert_cmd->tx_desc.send_wr;
2172 }
2173
2174 isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2175 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ\n", isert_cmd);
2176 return 1;
2177}
2178
2179static int
2180isert_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, bool recovery)
2181{
2182 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2183
2184 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2185 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2186
2187 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2188 isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2189 &isert_cmd->tx_desc.tx_cqe, NULL);
2190
2191 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE\n",
2192 isert_cmd);
2193 return 0;
2194}
2195
2196static int
2197isert_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2198{
2199 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2200 int ret = 0;
2201
2202 switch (state) {
2203 case ISTATE_REMOVE:
2204 spin_lock_bh(&conn->cmd_lock);
2205 list_del_init(&cmd->i_conn_node);
2206 spin_unlock_bh(&conn->cmd_lock);
2207 isert_put_cmd(isert_cmd, true);
2208 break;
2209 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2210 ret = isert_put_nopin(cmd, conn, false);
2211 break;
2212 default:
2213 isert_err("Unknown immediate state: 0x%02x\n", state);
2214 ret = -EINVAL;
2215 break;
2216 }
2217
2218 return ret;
2219}
2220
2221static int
2222isert_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
2223{
2224 struct isert_conn *isert_conn = conn->context;
2225 int ret;
2226
2227 switch (state) {
2228 case ISTATE_SEND_LOGOUTRSP:
2229 ret = isert_put_logout_rsp(cmd, conn);
2230 if (!ret)
2231 isert_conn->logout_posted = true;
2232 break;
2233 case ISTATE_SEND_NOPIN:
2234 ret = isert_put_nopin(cmd, conn, true);
2235 break;
2236 case ISTATE_SEND_TASKMGTRSP:
2237 ret = isert_put_tm_rsp(cmd, conn);
2238 break;
2239 case ISTATE_SEND_REJECT:
2240 ret = isert_put_reject(cmd, conn);
2241 break;
2242 case ISTATE_SEND_TEXTRSP:
2243 ret = isert_put_text_rsp(cmd, conn);
2244 break;
2245 case ISTATE_SEND_STATUS:
2246 /*
2247 * Special case for sending non GOOD SCSI status from TX thread
2248 * context during pre se_cmd excecution failure.
2249 */
2250 ret = isert_put_response(conn, cmd);
2251 break;
2252 default:
2253 isert_err("Unknown response state: 0x%02x\n", state);
2254 ret = -EINVAL;
2255 break;
2256 }
2257
2258 return ret;
2259}
2260
2261struct rdma_cm_id *
2262isert_setup_id(struct isert_np *isert_np)
2263{
2264 struct iscsi_np *np = isert_np->np;
2265 struct rdma_cm_id *id;
2266 struct sockaddr *sa;
2267 int ret;
2268
2269 sa = (struct sockaddr *)&np->np_sockaddr;
2270 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2271
2272 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2273 RDMA_PS_TCP, IB_QPT_RC);
2274 if (IS_ERR(id)) {
2275 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2276 ret = PTR_ERR(id);
2277 goto out;
2278 }
2279 isert_dbg("id %p context %p\n", id, id->context);
2280
2281 ret = rdma_bind_addr(id, sa);
2282 if (ret) {
2283 isert_err("rdma_bind_addr() failed: %d\n", ret);
2284 goto out_id;
2285 }
2286
2287 ret = rdma_listen(id, 0);
2288 if (ret) {
2289 isert_err("rdma_listen() failed: %d\n", ret);
2290 goto out_id;
2291 }
2292
2293 return id;
2294out_id:
2295 rdma_destroy_id(id);
2296out:
2297 return ERR_PTR(ret);
2298}
2299
2300static int
2301isert_setup_np(struct iscsi_np *np,
2302 struct sockaddr_storage *ksockaddr)
2303{
2304 struct isert_np *isert_np;
2305 struct rdma_cm_id *isert_lid;
2306 int ret;
2307
2308 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2309 if (!isert_np)
2310 return -ENOMEM;
2311
2312 sema_init(&isert_np->sem, 0);
2313 mutex_init(&isert_np->mutex);
2314 INIT_LIST_HEAD(&isert_np->accepted);
2315 INIT_LIST_HEAD(&isert_np->pending);
2316 isert_np->np = np;
2317
2318 /*
2319 * Setup the np->np_sockaddr from the passed sockaddr setup
2320 * in iscsi_target_configfs.c code..
2321 */
2322 memcpy(&np->np_sockaddr, ksockaddr,
2323 sizeof(struct sockaddr_storage));
2324
2325 isert_lid = isert_setup_id(isert_np);
2326 if (IS_ERR(isert_lid)) {
2327 ret = PTR_ERR(isert_lid);
2328 goto out;
2329 }
2330
2331 isert_np->cm_id = isert_lid;
2332 np->np_context = isert_np;
2333
2334 return 0;
2335
2336out:
2337 kfree(isert_np);
2338
2339 return ret;
2340}
2341
2342static int
2343isert_rdma_accept(struct isert_conn *isert_conn)
2344{
2345 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2346 struct rdma_conn_param cp;
2347 int ret;
2348 struct iser_cm_hdr rsp_hdr;
2349
2350 memset(&cp, 0, sizeof(struct rdma_conn_param));
2351 cp.initiator_depth = isert_conn->initiator_depth;
2352 cp.retry_count = 7;
2353 cp.rnr_retry_count = 7;
2354
2355 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2356 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2357 if (!isert_conn->snd_w_inv)
2358 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2359 cp.private_data = (void *)&rsp_hdr;
2360 cp.private_data_len = sizeof(rsp_hdr);
2361
2362 ret = rdma_accept(cm_id, &cp);
2363 if (ret) {
2364 isert_err("rdma_accept() failed with: %d\n", ret);
2365 return ret;
2366 }
2367
2368 return 0;
2369}
2370
2371static int
2372isert_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
2373{
2374 struct isert_conn *isert_conn = conn->context;
2375 int ret;
2376
2377 isert_info("before login_req comp conn: %p\n", isert_conn);
2378 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2379 if (ret) {
2380 isert_err("isert_conn %p interrupted before got login req\n",
2381 isert_conn);
2382 return ret;
2383 }
2384 reinit_completion(&isert_conn->login_req_comp);
2385
2386 /*
2387 * For login requests after the first PDU, isert_rx_login_req() will
2388 * kick schedule_delayed_work(&conn->login_work) as the packet is
2389 * received, which turns this callback from iscsi_target_do_login_rx()
2390 * into a NOP.
2391 */
2392 if (!login->first_request)
2393 return 0;
2394
2395 isert_rx_login_req(isert_conn);
2396
2397 isert_info("before login_comp conn: %p\n", conn);
2398 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2399 if (ret)
2400 return ret;
2401
2402 isert_info("processing login->req: %p\n", login->req);
2403
2404 return 0;
2405}
2406
2407static void
2408isert_set_conn_info(struct iscsi_np *np, struct iscsi_conn *conn,
2409 struct isert_conn *isert_conn)
2410{
2411 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2412 struct rdma_route *cm_route = &cm_id->route;
2413
2414 conn->login_family = np->np_sockaddr.ss_family;
2415
2416 conn->login_sockaddr = cm_route->addr.dst_addr;
2417 conn->local_sockaddr = cm_route->addr.src_addr;
2418}
2419
2420static int
2421isert_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
2422{
2423 struct isert_np *isert_np = np->np_context;
2424 struct isert_conn *isert_conn;
2425 int ret;
2426
2427accept_wait:
2428 ret = down_interruptible(&isert_np->sem);
2429 if (ret)
2430 return -ENODEV;
2431
2432 spin_lock_bh(&np->np_thread_lock);
2433 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2434 spin_unlock_bh(&np->np_thread_lock);
2435 isert_dbg("np_thread_state %d\n",
2436 np->np_thread_state);
2437 /**
2438 * No point in stalling here when np_thread
2439 * is in state RESET/SHUTDOWN/EXIT - bail
2440 **/
2441 return -ENODEV;
2442 }
2443 spin_unlock_bh(&np->np_thread_lock);
2444
2445 mutex_lock(&isert_np->mutex);
2446 if (list_empty(&isert_np->pending)) {
2447 mutex_unlock(&isert_np->mutex);
2448 goto accept_wait;
2449 }
2450 isert_conn = list_first_entry(&isert_np->pending,
2451 struct isert_conn, node);
2452 list_del_init(&isert_conn->node);
2453 mutex_unlock(&isert_np->mutex);
2454
2455 conn->context = isert_conn;
2456 isert_conn->conn = conn;
2457 isert_conn->state = ISER_CONN_BOUND;
2458
2459 isert_set_conn_info(np, conn, isert_conn);
2460
2461 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2462
2463 return 0;
2464}
2465
2466static void
2467isert_free_np(struct iscsi_np *np)
2468{
2469 struct isert_np *isert_np = np->np_context;
2470 struct isert_conn *isert_conn, *n;
2471
2472 if (isert_np->cm_id)
2473 rdma_destroy_id(isert_np->cm_id);
2474
2475 /*
2476 * FIXME: At this point we don't have a good way to insure
2477 * that at this point we don't have hanging connections that
2478 * completed RDMA establishment but didn't start iscsi login
2479 * process. So work-around this by cleaning up what ever piled
2480 * up in accepted and pending lists.
2481 */
2482 mutex_lock(&isert_np->mutex);
2483 if (!list_empty(&isert_np->pending)) {
2484 isert_info("Still have isert pending connections\n");
2485 list_for_each_entry_safe(isert_conn, n,
2486 &isert_np->pending,
2487 node) {
2488 isert_info("cleaning isert_conn %p state (%d)\n",
2489 isert_conn, isert_conn->state);
2490 isert_connect_release(isert_conn);
2491 }
2492 }
2493
2494 if (!list_empty(&isert_np->accepted)) {
2495 isert_info("Still have isert accepted connections\n");
2496 list_for_each_entry_safe(isert_conn, n,
2497 &isert_np->accepted,
2498 node) {
2499 isert_info("cleaning isert_conn %p state (%d)\n",
2500 isert_conn, isert_conn->state);
2501 isert_connect_release(isert_conn);
2502 }
2503 }
2504 mutex_unlock(&isert_np->mutex);
2505
2506 np->np_context = NULL;
2507 kfree(isert_np);
2508}
2509
2510static void isert_release_work(struct work_struct *work)
2511{
2512 struct isert_conn *isert_conn = container_of(work,
2513 struct isert_conn,
2514 release_work);
2515
2516 isert_info("Starting release conn %p\n", isert_conn);
2517
2518 mutex_lock(&isert_conn->mutex);
2519 isert_conn->state = ISER_CONN_DOWN;
2520 mutex_unlock(&isert_conn->mutex);
2521
2522 isert_info("Destroying conn %p\n", isert_conn);
2523 isert_put_conn(isert_conn);
2524}
2525
2526static void
2527isert_wait4logout(struct isert_conn *isert_conn)
2528{
2529 struct iscsi_conn *conn = isert_conn->conn;
2530
2531 isert_info("conn %p\n", isert_conn);
2532
2533 if (isert_conn->logout_posted) {
2534 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2535 wait_for_completion_timeout(&conn->conn_logout_comp,
2536 SECONDS_FOR_LOGOUT_COMP * HZ);
2537 }
2538}
2539
2540static void
2541isert_wait4cmds(struct iscsi_conn *conn)
2542{
2543 isert_info("iscsi_conn %p\n", conn);
2544
2545 if (conn->sess) {
2546 target_sess_cmd_list_set_waiting(conn->sess->se_sess);
2547 target_wait_for_sess_cmds(conn->sess->se_sess);
2548 }
2549}
2550
2551/**
2552 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2553 * unsolicitate dataout
2554 * @conn: iscsi connection
2555 *
2556 * We might still have commands that are waiting for unsolicited
2557 * dataouts messages. We must put the extra reference on those
2558 * before blocking on the target_wait_for_session_cmds
2559 */
2560static void
2561isert_put_unsol_pending_cmds(struct iscsi_conn *conn)
2562{
2563 struct iscsi_cmd *cmd, *tmp;
2564 static LIST_HEAD(drop_cmd_list);
2565
2566 spin_lock_bh(&conn->cmd_lock);
2567 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2568 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2569 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2570 (cmd->write_data_done < cmd->se_cmd.data_length))
2571 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2572 }
2573 spin_unlock_bh(&conn->cmd_lock);
2574
2575 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2576 list_del_init(&cmd->i_conn_node);
2577 if (cmd->i_state != ISTATE_REMOVE) {
2578 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2579
2580 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2581 isert_put_cmd(isert_cmd, true);
2582 }
2583 }
2584}
2585
2586static void isert_wait_conn(struct iscsi_conn *conn)
2587{
2588 struct isert_conn *isert_conn = conn->context;
2589
2590 isert_info("Starting conn %p\n", isert_conn);
2591
2592 mutex_lock(&isert_conn->mutex);
2593 isert_conn_terminate(isert_conn);
2594 mutex_unlock(&isert_conn->mutex);
2595
2596 ib_drain_qp(isert_conn->qp);
2597 isert_put_unsol_pending_cmds(conn);
2598 isert_wait4cmds(conn);
2599 isert_wait4logout(isert_conn);
2600
2601 queue_work(isert_release_wq, &isert_conn->release_work);
2602}
2603
2604static void isert_free_conn(struct iscsi_conn *conn)
2605{
2606 struct isert_conn *isert_conn = conn->context;
2607
2608 ib_drain_qp(isert_conn->qp);
2609 isert_put_conn(isert_conn);
2610}
2611
2612static void isert_get_rx_pdu(struct iscsi_conn *conn)
2613{
2614 struct completion comp;
2615
2616 init_completion(&comp);
2617
2618 wait_for_completion_interruptible(&comp);
2619}
2620
2621static struct iscsit_transport iser_target_transport = {
2622 .name = "IB/iSER",
2623 .transport_type = ISCSI_INFINIBAND,
2624 .rdma_shutdown = true,
2625 .priv_size = sizeof(struct isert_cmd),
2626 .owner = THIS_MODULE,
2627 .iscsit_setup_np = isert_setup_np,
2628 .iscsit_accept_np = isert_accept_np,
2629 .iscsit_free_np = isert_free_np,
2630 .iscsit_wait_conn = isert_wait_conn,
2631 .iscsit_free_conn = isert_free_conn,
2632 .iscsit_get_login_rx = isert_get_login_rx,
2633 .iscsit_put_login_tx = isert_put_login_tx,
2634 .iscsit_immediate_queue = isert_immediate_queue,
2635 .iscsit_response_queue = isert_response_queue,
2636 .iscsit_get_dataout = isert_get_dataout,
2637 .iscsit_queue_data_in = isert_put_datain,
2638 .iscsit_queue_status = isert_put_response,
2639 .iscsit_aborted_task = isert_aborted_task,
2640 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2641 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2642};
2643
2644static int __init isert_init(void)
2645{
2646 int ret;
2647
2648 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2649 WQ_UNBOUND | WQ_HIGHPRI, 0);
2650 if (!isert_comp_wq) {
2651 isert_err("Unable to allocate isert_comp_wq\n");
2652 return -ENOMEM;
2653 }
2654
2655 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2656 WQ_UNBOUND_MAX_ACTIVE);
2657 if (!isert_release_wq) {
2658 isert_err("Unable to allocate isert_release_wq\n");
2659 ret = -ENOMEM;
2660 goto destroy_comp_wq;
2661 }
2662
2663 iscsit_register_transport(&iser_target_transport);
2664 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2665
2666 return 0;
2667
2668destroy_comp_wq:
2669 destroy_workqueue(isert_comp_wq);
2670
2671 return ret;
2672}
2673
2674static void __exit isert_exit(void)
2675{
2676 flush_scheduled_work();
2677 destroy_workqueue(isert_release_wq);
2678 destroy_workqueue(isert_comp_wq);
2679 iscsit_unregister_transport(&iser_target_transport);
2680 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2681}
2682
2683MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2684MODULE_VERSION("1.0");
2685MODULE_AUTHOR("nab@Linux-iSCSI.org");
2686MODULE_LICENSE("GPL");
2687
2688module_init(isert_init);
2689module_exit(isert_exit);