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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// 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
661 ib_drain_qp(isert_conn->qp);
662 list_del_init(&isert_conn->node);
663 isert_conn->cm_id = NULL;
664 isert_put_conn(isert_conn);
665
666 return -1;
667}
668
669static int
670isert_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
671{
672 struct isert_np *isert_np = cma_id->context;
673 struct isert_conn *isert_conn;
674 int ret = 0;
675
676 isert_info("%s (%d): status %d id %p np %p\n",
677 rdma_event_msg(event->event), event->event,
678 event->status, cma_id, cma_id->context);
679
680 if (isert_np->cm_id == cma_id)
681 return isert_np_cma_handler(cma_id->context, event->event);
682
683 switch (event->event) {
684 case RDMA_CM_EVENT_CONNECT_REQUEST:
685 ret = isert_connect_request(cma_id, event);
686 if (ret)
687 isert_err("failed handle connect request %d\n", ret);
688 break;
689 case RDMA_CM_EVENT_ESTABLISHED:
690 isert_connected_handler(cma_id);
691 break;
692 case RDMA_CM_EVENT_ADDR_CHANGE:
693 case RDMA_CM_EVENT_DISCONNECTED:
694 case RDMA_CM_EVENT_TIMEWAIT_EXIT: /* FALLTHRU */
695 ret = isert_disconnected_handler(cma_id, event->event);
696 break;
697 case RDMA_CM_EVENT_DEVICE_REMOVAL:
698 isert_conn = cma_id->qp->qp_context;
699 isert_conn->dev_removed = true;
700 isert_disconnected_handler(cma_id, event->event);
701 wait_event_interruptible(isert_conn->rem_wait,
702 isert_conn->state == ISER_CONN_DOWN);
703 kfree(isert_conn);
704 /*
705 * return non-zero from the callback to destroy
706 * the rdma cm id
707 */
708 return 1;
709 case RDMA_CM_EVENT_REJECTED:
710 isert_info("Connection rejected: %s\n",
711 rdma_reject_msg(cma_id, event->status));
712 fallthrough;
713 case RDMA_CM_EVENT_UNREACHABLE:
714 case RDMA_CM_EVENT_CONNECT_ERROR:
715 ret = isert_connect_error(cma_id);
716 break;
717 default:
718 isert_err("Unhandled RDMA CMA event: %d\n", event->event);
719 break;
720 }
721
722 return ret;
723}
724
725static int
726isert_post_recvm(struct isert_conn *isert_conn, u32 count)
727{
728 struct ib_recv_wr *rx_wr;
729 int i, ret;
730 struct iser_rx_desc *rx_desc;
731
732 for (rx_wr = isert_conn->rx_wr, i = 0; i < count; i++, rx_wr++) {
733 rx_desc = &isert_conn->rx_descs[i];
734
735 rx_wr->wr_cqe = &rx_desc->rx_cqe;
736 rx_wr->sg_list = &rx_desc->rx_sg;
737 rx_wr->num_sge = 1;
738 rx_wr->next = rx_wr + 1;
739 rx_desc->in_use = false;
740 }
741 rx_wr--;
742 rx_wr->next = NULL; /* mark end of work requests list */
743
744 ret = ib_post_recv(isert_conn->qp, isert_conn->rx_wr, NULL);
745 if (ret)
746 isert_err("ib_post_recv() failed with ret: %d\n", ret);
747
748 return ret;
749}
750
751static int
752isert_post_recv(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc)
753{
754 struct ib_recv_wr rx_wr;
755 int ret;
756
757 if (!rx_desc->in_use) {
758 /*
759 * if the descriptor is not in-use we already reposted it
760 * for recv, so just silently return
761 */
762 return 0;
763 }
764
765 rx_desc->in_use = false;
766 rx_wr.wr_cqe = &rx_desc->rx_cqe;
767 rx_wr.sg_list = &rx_desc->rx_sg;
768 rx_wr.num_sge = 1;
769 rx_wr.next = NULL;
770
771 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
772 if (ret)
773 isert_err("ib_post_recv() failed with ret: %d\n", ret);
774
775 return ret;
776}
777
778static int
779isert_login_post_send(struct isert_conn *isert_conn, struct iser_tx_desc *tx_desc)
780{
781 struct ib_device *ib_dev = isert_conn->cm_id->device;
782 struct ib_send_wr send_wr;
783 int ret;
784
785 ib_dma_sync_single_for_device(ib_dev, tx_desc->dma_addr,
786 ISER_HEADERS_LEN, DMA_TO_DEVICE);
787
788 tx_desc->tx_cqe.done = isert_login_send_done;
789
790 send_wr.next = NULL;
791 send_wr.wr_cqe = &tx_desc->tx_cqe;
792 send_wr.sg_list = tx_desc->tx_sg;
793 send_wr.num_sge = tx_desc->num_sge;
794 send_wr.opcode = IB_WR_SEND;
795 send_wr.send_flags = IB_SEND_SIGNALED;
796
797 ret = ib_post_send(isert_conn->qp, &send_wr, NULL);
798 if (ret)
799 isert_err("ib_post_send() failed, ret: %d\n", ret);
800
801 return ret;
802}
803
804static void
805__isert_create_send_desc(struct isert_device *device,
806 struct iser_tx_desc *tx_desc)
807{
808
809 memset(&tx_desc->iser_header, 0, sizeof(struct iser_ctrl));
810 tx_desc->iser_header.flags = ISCSI_CTRL;
811
812 tx_desc->num_sge = 1;
813
814 if (tx_desc->tx_sg[0].lkey != device->pd->local_dma_lkey) {
815 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
816 isert_dbg("tx_desc %p lkey mismatch, fixing\n", tx_desc);
817 }
818}
819
820static void
821isert_create_send_desc(struct isert_conn *isert_conn,
822 struct isert_cmd *isert_cmd,
823 struct iser_tx_desc *tx_desc)
824{
825 struct isert_device *device = isert_conn->device;
826 struct ib_device *ib_dev = device->ib_device;
827
828 ib_dma_sync_single_for_cpu(ib_dev, tx_desc->dma_addr,
829 ISER_HEADERS_LEN, DMA_TO_DEVICE);
830
831 __isert_create_send_desc(device, tx_desc);
832}
833
834static int
835isert_init_tx_hdrs(struct isert_conn *isert_conn,
836 struct iser_tx_desc *tx_desc)
837{
838 struct isert_device *device = isert_conn->device;
839 struct ib_device *ib_dev = device->ib_device;
840 u64 dma_addr;
841
842 dma_addr = ib_dma_map_single(ib_dev, (void *)tx_desc,
843 ISER_HEADERS_LEN, DMA_TO_DEVICE);
844 if (ib_dma_mapping_error(ib_dev, dma_addr)) {
845 isert_err("ib_dma_mapping_error() failed\n");
846 return -ENOMEM;
847 }
848
849 tx_desc->dma_addr = dma_addr;
850 tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
851 tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
852 tx_desc->tx_sg[0].lkey = device->pd->local_dma_lkey;
853
854 isert_dbg("Setup tx_sg[0].addr: 0x%llx length: %u lkey: 0x%x\n",
855 tx_desc->tx_sg[0].addr, tx_desc->tx_sg[0].length,
856 tx_desc->tx_sg[0].lkey);
857
858 return 0;
859}
860
861static void
862isert_init_send_wr(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
863 struct ib_send_wr *send_wr)
864{
865 struct iser_tx_desc *tx_desc = &isert_cmd->tx_desc;
866
867 tx_desc->tx_cqe.done = isert_send_done;
868 send_wr->wr_cqe = &tx_desc->tx_cqe;
869
870 if (isert_conn->snd_w_inv && isert_cmd->inv_rkey) {
871 send_wr->opcode = IB_WR_SEND_WITH_INV;
872 send_wr->ex.invalidate_rkey = isert_cmd->inv_rkey;
873 } else {
874 send_wr->opcode = IB_WR_SEND;
875 }
876
877 send_wr->sg_list = &tx_desc->tx_sg[0];
878 send_wr->num_sge = isert_cmd->tx_desc.num_sge;
879 send_wr->send_flags = IB_SEND_SIGNALED;
880}
881
882static int
883isert_login_post_recv(struct isert_conn *isert_conn)
884{
885 struct ib_recv_wr rx_wr;
886 struct ib_sge sge;
887 int ret;
888
889 memset(&sge, 0, sizeof(struct ib_sge));
890 sge.addr = isert_conn->login_desc->dma_addr +
891 isert_get_hdr_offset(isert_conn->login_desc);
892 sge.length = ISER_RX_PAYLOAD_SIZE;
893 sge.lkey = isert_conn->device->pd->local_dma_lkey;
894
895 isert_dbg("Setup sge: addr: %llx length: %d 0x%08x\n",
896 sge.addr, sge.length, sge.lkey);
897
898 isert_conn->login_desc->rx_cqe.done = isert_login_recv_done;
899
900 memset(&rx_wr, 0, sizeof(struct ib_recv_wr));
901 rx_wr.wr_cqe = &isert_conn->login_desc->rx_cqe;
902 rx_wr.sg_list = &sge;
903 rx_wr.num_sge = 1;
904
905 ret = ib_post_recv(isert_conn->qp, &rx_wr, NULL);
906 if (ret)
907 isert_err("ib_post_recv() failed: %d\n", ret);
908
909 return ret;
910}
911
912static int
913isert_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
914 u32 length)
915{
916 struct isert_conn *isert_conn = conn->context;
917 struct isert_device *device = isert_conn->device;
918 struct ib_device *ib_dev = device->ib_device;
919 struct iser_tx_desc *tx_desc = &isert_conn->login_tx_desc;
920 int ret;
921
922 __isert_create_send_desc(device, tx_desc);
923
924 memcpy(&tx_desc->iscsi_header, &login->rsp[0],
925 sizeof(struct iscsi_hdr));
926
927 isert_init_tx_hdrs(isert_conn, tx_desc);
928
929 if (length > 0) {
930 struct ib_sge *tx_dsg = &tx_desc->tx_sg[1];
931
932 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_rsp_dma,
933 length, DMA_TO_DEVICE);
934
935 memcpy(isert_conn->login_rsp_buf, login->rsp_buf, length);
936
937 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_rsp_dma,
938 length, DMA_TO_DEVICE);
939
940 tx_dsg->addr = isert_conn->login_rsp_dma;
941 tx_dsg->length = length;
942 tx_dsg->lkey = isert_conn->device->pd->local_dma_lkey;
943 tx_desc->num_sge = 2;
944 }
945 if (!login->login_failed) {
946 if (login->login_complete) {
947 ret = isert_alloc_rx_descriptors(isert_conn);
948 if (ret)
949 return ret;
950
951 ret = isert_post_recvm(isert_conn,
952 ISERT_QP_MAX_RECV_DTOS);
953 if (ret)
954 return ret;
955
956 /* Now we are in FULL_FEATURE phase */
957 mutex_lock(&isert_conn->mutex);
958 isert_conn->state = ISER_CONN_FULL_FEATURE;
959 mutex_unlock(&isert_conn->mutex);
960 goto post_send;
961 }
962
963 ret = isert_login_post_recv(isert_conn);
964 if (ret)
965 return ret;
966 }
967post_send:
968 ret = isert_login_post_send(isert_conn, tx_desc);
969 if (ret)
970 return ret;
971
972 return 0;
973}
974
975static void
976isert_rx_login_req(struct isert_conn *isert_conn)
977{
978 struct iser_rx_desc *rx_desc = isert_conn->login_desc;
979 int rx_buflen = isert_conn->login_req_len;
980 struct iscsit_conn *conn = isert_conn->conn;
981 struct iscsi_login *login = conn->conn_login;
982 int size;
983
984 isert_info("conn %p\n", isert_conn);
985
986 WARN_ON_ONCE(!login);
987
988 if (login->first_request) {
989 struct iscsi_login_req *login_req =
990 (struct iscsi_login_req *)isert_get_iscsi_hdr(rx_desc);
991 /*
992 * Setup the initial iscsi_login values from the leading
993 * login request PDU.
994 */
995 login->leading_connection = (!login_req->tsih) ? 1 : 0;
996 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(
997 login_req->flags);
998 login->version_min = login_req->min_version;
999 login->version_max = login_req->max_version;
1000 memcpy(login->isid, login_req->isid, 6);
1001 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1002 login->init_task_tag = login_req->itt;
1003 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1004 login->cid = be16_to_cpu(login_req->cid);
1005 login->tsih = be16_to_cpu(login_req->tsih);
1006 }
1007
1008 memcpy(&login->req[0], isert_get_iscsi_hdr(rx_desc), ISCSI_HDR_LEN);
1009
1010 size = min(rx_buflen, MAX_KEY_VALUE_PAIRS);
1011 isert_dbg("Using login payload size: %d, rx_buflen: %d "
1012 "MAX_KEY_VALUE_PAIRS: %d\n", size, rx_buflen,
1013 MAX_KEY_VALUE_PAIRS);
1014 memcpy(login->req_buf, isert_get_data(rx_desc), size);
1015
1016 if (login->first_request) {
1017 complete(&isert_conn->login_comp);
1018 return;
1019 }
1020 queue_delayed_work(isert_login_wq, &conn->login_work, 0);
1021}
1022
1023static struct iscsit_cmd
1024*isert_allocate_cmd(struct iscsit_conn *conn, struct iser_rx_desc *rx_desc)
1025{
1026 struct isert_conn *isert_conn = conn->context;
1027 struct isert_cmd *isert_cmd;
1028 struct iscsit_cmd *cmd;
1029
1030 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
1031 if (!cmd) {
1032 isert_err("Unable to allocate iscsit_cmd + isert_cmd\n");
1033 return NULL;
1034 }
1035 isert_cmd = iscsit_priv_cmd(cmd);
1036 isert_cmd->conn = isert_conn;
1037 isert_cmd->iscsit_cmd = cmd;
1038 isert_cmd->rx_desc = rx_desc;
1039
1040 return cmd;
1041}
1042
1043static int
1044isert_handle_scsi_cmd(struct isert_conn *isert_conn,
1045 struct isert_cmd *isert_cmd, struct iscsit_cmd *cmd,
1046 struct iser_rx_desc *rx_desc, unsigned char *buf)
1047{
1048 struct iscsit_conn *conn = isert_conn->conn;
1049 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1050 int imm_data, imm_data_len, unsol_data, sg_nents, rc;
1051 bool dump_payload = false;
1052 unsigned int data_len;
1053
1054 rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1055 if (rc < 0)
1056 return rc;
1057
1058 imm_data = cmd->immediate_data;
1059 imm_data_len = cmd->first_burst_len;
1060 unsol_data = cmd->unsolicited_data;
1061 data_len = cmd->se_cmd.data_length;
1062
1063 if (imm_data && imm_data_len == data_len)
1064 cmd->se_cmd.se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1065 rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1066 if (rc < 0) {
1067 return 0;
1068 } else if (rc > 0) {
1069 dump_payload = true;
1070 goto sequence_cmd;
1071 }
1072
1073 if (!imm_data)
1074 return 0;
1075
1076 if (imm_data_len != data_len) {
1077 sg_nents = max(1UL, DIV_ROUND_UP(imm_data_len, PAGE_SIZE));
1078 sg_copy_from_buffer(cmd->se_cmd.t_data_sg, sg_nents,
1079 isert_get_data(rx_desc), imm_data_len);
1080 isert_dbg("Copy Immediate sg_nents: %u imm_data_len: %d\n",
1081 sg_nents, imm_data_len);
1082 } else {
1083 sg_init_table(&isert_cmd->sg, 1);
1084 cmd->se_cmd.t_data_sg = &isert_cmd->sg;
1085 cmd->se_cmd.t_data_nents = 1;
1086 sg_set_buf(&isert_cmd->sg, isert_get_data(rx_desc),
1087 imm_data_len);
1088 isert_dbg("Transfer Immediate imm_data_len: %d\n",
1089 imm_data_len);
1090 }
1091
1092 cmd->write_data_done += imm_data_len;
1093
1094 if (cmd->write_data_done == cmd->se_cmd.data_length) {
1095 spin_lock_bh(&cmd->istate_lock);
1096 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1097 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1098 spin_unlock_bh(&cmd->istate_lock);
1099 }
1100
1101sequence_cmd:
1102 rc = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1103
1104 if (!rc && !dump_payload && unsol_data)
1105 iscsit_set_unsolicited_dataout(cmd);
1106 else if (dump_payload && imm_data)
1107 target_put_sess_cmd(&cmd->se_cmd);
1108
1109 return 0;
1110}
1111
1112static int
1113isert_handle_iscsi_dataout(struct isert_conn *isert_conn,
1114 struct iser_rx_desc *rx_desc, unsigned char *buf)
1115{
1116 struct scatterlist *sg_start;
1117 struct iscsit_conn *conn = isert_conn->conn;
1118 struct iscsit_cmd *cmd = NULL;
1119 struct iscsi_data *hdr = (struct iscsi_data *)buf;
1120 u32 unsol_data_len = ntoh24(hdr->dlength);
1121 int rc, sg_nents, sg_off, page_off;
1122
1123 rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1124 if (rc < 0)
1125 return rc;
1126 else if (!cmd)
1127 return 0;
1128 /*
1129 * FIXME: Unexpected unsolicited_data out
1130 */
1131 if (!cmd->unsolicited_data) {
1132 isert_err("Received unexpected solicited data payload\n");
1133 dump_stack();
1134 return -1;
1135 }
1136
1137 isert_dbg("Unsolicited DataOut unsol_data_len: %u, "
1138 "write_data_done: %u, data_length: %u\n",
1139 unsol_data_len, cmd->write_data_done,
1140 cmd->se_cmd.data_length);
1141
1142 sg_off = cmd->write_data_done / PAGE_SIZE;
1143 sg_start = &cmd->se_cmd.t_data_sg[sg_off];
1144 sg_nents = max(1UL, DIV_ROUND_UP(unsol_data_len, PAGE_SIZE));
1145 page_off = cmd->write_data_done % PAGE_SIZE;
1146 /*
1147 * FIXME: Non page-aligned unsolicited_data out
1148 */
1149 if (page_off) {
1150 isert_err("unexpected non-page aligned data payload\n");
1151 dump_stack();
1152 return -1;
1153 }
1154 isert_dbg("Copying DataOut: sg_start: %p, sg_off: %u "
1155 "sg_nents: %u from %p %u\n", sg_start, sg_off,
1156 sg_nents, isert_get_data(rx_desc), unsol_data_len);
1157
1158 sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),
1159 unsol_data_len);
1160
1161 rc = iscsit_check_dataout_payload(cmd, hdr, false);
1162 if (rc < 0)
1163 return rc;
1164
1165 /*
1166 * multiple data-outs on the same command can arrive -
1167 * so post the buffer before hand
1168 */
1169 return isert_post_recv(isert_conn, rx_desc);
1170}
1171
1172static int
1173isert_handle_nop_out(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1174 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1175 unsigned char *buf)
1176{
1177 struct iscsit_conn *conn = isert_conn->conn;
1178 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1179 int rc;
1180
1181 rc = iscsit_setup_nop_out(conn, cmd, hdr);
1182 if (rc < 0)
1183 return rc;
1184 /*
1185 * FIXME: Add support for NOPOUT payload using unsolicited RDMA payload
1186 */
1187
1188 return iscsit_process_nop_out(conn, cmd, hdr);
1189}
1190
1191static int
1192isert_handle_text_cmd(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd,
1193 struct iscsit_cmd *cmd, struct iser_rx_desc *rx_desc,
1194 struct iscsi_text *hdr)
1195{
1196 struct iscsit_conn *conn = isert_conn->conn;
1197 u32 payload_length = ntoh24(hdr->dlength);
1198 int rc;
1199 unsigned char *text_in = NULL;
1200
1201 rc = iscsit_setup_text_cmd(conn, cmd, hdr);
1202 if (rc < 0)
1203 return rc;
1204
1205 if (payload_length) {
1206 text_in = kzalloc(payload_length, GFP_KERNEL);
1207 if (!text_in)
1208 return -ENOMEM;
1209 }
1210 cmd->text_in_ptr = text_in;
1211
1212 memcpy(cmd->text_in_ptr, isert_get_data(rx_desc), payload_length);
1213
1214 return iscsit_process_text_cmd(conn, cmd, hdr);
1215}
1216
1217static int
1218isert_rx_opcode(struct isert_conn *isert_conn, struct iser_rx_desc *rx_desc,
1219 uint32_t read_stag, uint64_t read_va,
1220 uint32_t write_stag, uint64_t write_va)
1221{
1222 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1223 struct iscsit_conn *conn = isert_conn->conn;
1224 struct iscsit_cmd *cmd;
1225 struct isert_cmd *isert_cmd;
1226 int ret = -EINVAL;
1227 u8 opcode = (hdr->opcode & ISCSI_OPCODE_MASK);
1228
1229 if (conn->sess->sess_ops->SessionType &&
1230 (!(opcode & ISCSI_OP_TEXT) || !(opcode & ISCSI_OP_LOGOUT))) {
1231 isert_err("Got illegal opcode: 0x%02x in SessionType=Discovery,"
1232 " ignoring\n", opcode);
1233 return 0;
1234 }
1235
1236 switch (opcode) {
1237 case ISCSI_OP_SCSI_CMD:
1238 cmd = isert_allocate_cmd(conn, rx_desc);
1239 if (!cmd)
1240 break;
1241
1242 isert_cmd = iscsit_priv_cmd(cmd);
1243 isert_cmd->read_stag = read_stag;
1244 isert_cmd->read_va = read_va;
1245 isert_cmd->write_stag = write_stag;
1246 isert_cmd->write_va = write_va;
1247 isert_cmd->inv_rkey = read_stag ? read_stag : write_stag;
1248
1249 ret = isert_handle_scsi_cmd(isert_conn, isert_cmd, cmd,
1250 rx_desc, (unsigned char *)hdr);
1251 break;
1252 case ISCSI_OP_NOOP_OUT:
1253 cmd = isert_allocate_cmd(conn, rx_desc);
1254 if (!cmd)
1255 break;
1256
1257 isert_cmd = iscsit_priv_cmd(cmd);
1258 ret = isert_handle_nop_out(isert_conn, isert_cmd, cmd,
1259 rx_desc, (unsigned char *)hdr);
1260 break;
1261 case ISCSI_OP_SCSI_DATA_OUT:
1262 ret = isert_handle_iscsi_dataout(isert_conn, rx_desc,
1263 (unsigned char *)hdr);
1264 break;
1265 case ISCSI_OP_SCSI_TMFUNC:
1266 cmd = isert_allocate_cmd(conn, rx_desc);
1267 if (!cmd)
1268 break;
1269
1270 ret = iscsit_handle_task_mgt_cmd(conn, cmd,
1271 (unsigned char *)hdr);
1272 break;
1273 case ISCSI_OP_LOGOUT:
1274 cmd = isert_allocate_cmd(conn, rx_desc);
1275 if (!cmd)
1276 break;
1277
1278 ret = iscsit_handle_logout_cmd(conn, cmd, (unsigned char *)hdr);
1279 break;
1280 case ISCSI_OP_TEXT:
1281 if (be32_to_cpu(hdr->ttt) != 0xFFFFFFFF)
1282 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
1283 else
1284 cmd = isert_allocate_cmd(conn, rx_desc);
1285
1286 if (!cmd)
1287 break;
1288
1289 isert_cmd = iscsit_priv_cmd(cmd);
1290 ret = isert_handle_text_cmd(isert_conn, isert_cmd, cmd,
1291 rx_desc, (struct iscsi_text *)hdr);
1292 break;
1293 default:
1294 isert_err("Got unknown iSCSI OpCode: 0x%02x\n", opcode);
1295 dump_stack();
1296 break;
1297 }
1298
1299 return ret;
1300}
1301
1302static void
1303isert_print_wc(struct ib_wc *wc, const char *type)
1304{
1305 if (wc->status != IB_WC_WR_FLUSH_ERR)
1306 isert_err("%s failure: %s (%d) vend_err %x\n", type,
1307 ib_wc_status_msg(wc->status), wc->status,
1308 wc->vendor_err);
1309 else
1310 isert_dbg("%s failure: %s (%d)\n", type,
1311 ib_wc_status_msg(wc->status), wc->status);
1312}
1313
1314static void
1315isert_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1316{
1317 struct isert_conn *isert_conn = wc->qp->qp_context;
1318 struct ib_device *ib_dev = isert_conn->cm_id->device;
1319 struct iser_rx_desc *rx_desc = cqe_to_rx_desc(wc->wr_cqe);
1320 struct iscsi_hdr *hdr = isert_get_iscsi_hdr(rx_desc);
1321 struct iser_ctrl *iser_ctrl = isert_get_iser_hdr(rx_desc);
1322 uint64_t read_va = 0, write_va = 0;
1323 uint32_t read_stag = 0, write_stag = 0;
1324
1325 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1326 isert_print_wc(wc, "recv");
1327 if (wc->status != IB_WC_WR_FLUSH_ERR)
1328 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1329 return;
1330 }
1331
1332 rx_desc->in_use = true;
1333
1334 ib_dma_sync_single_for_cpu(ib_dev, rx_desc->dma_addr,
1335 ISER_RX_SIZE, DMA_FROM_DEVICE);
1336
1337 isert_dbg("DMA: 0x%llx, iSCSI opcode: 0x%02x, ITT: 0x%08x, flags: 0x%02x dlen: %d\n",
1338 rx_desc->dma_addr, hdr->opcode, hdr->itt, hdr->flags,
1339 (int)(wc->byte_len - ISER_HEADERS_LEN));
1340
1341 switch (iser_ctrl->flags & 0xF0) {
1342 case ISCSI_CTRL:
1343 if (iser_ctrl->flags & ISER_RSV) {
1344 read_stag = be32_to_cpu(iser_ctrl->read_stag);
1345 read_va = be64_to_cpu(iser_ctrl->read_va);
1346 isert_dbg("ISER_RSV: read_stag: 0x%x read_va: 0x%llx\n",
1347 read_stag, (unsigned long long)read_va);
1348 }
1349 if (iser_ctrl->flags & ISER_WSV) {
1350 write_stag = be32_to_cpu(iser_ctrl->write_stag);
1351 write_va = be64_to_cpu(iser_ctrl->write_va);
1352 isert_dbg("ISER_WSV: write_stag: 0x%x write_va: 0x%llx\n",
1353 write_stag, (unsigned long long)write_va);
1354 }
1355
1356 isert_dbg("ISER ISCSI_CTRL PDU\n");
1357 break;
1358 case ISER_HELLO:
1359 isert_err("iSER Hello message\n");
1360 break;
1361 default:
1362 isert_warn("Unknown iSER hdr flags: 0x%02x\n", iser_ctrl->flags);
1363 break;
1364 }
1365
1366 isert_rx_opcode(isert_conn, rx_desc,
1367 read_stag, read_va, write_stag, write_va);
1368
1369 ib_dma_sync_single_for_device(ib_dev, rx_desc->dma_addr,
1370 ISER_RX_SIZE, DMA_FROM_DEVICE);
1371}
1372
1373static void
1374isert_login_recv_done(struct ib_cq *cq, struct ib_wc *wc)
1375{
1376 struct isert_conn *isert_conn = wc->qp->qp_context;
1377 struct ib_device *ib_dev = isert_conn->device->ib_device;
1378
1379 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1380 isert_print_wc(wc, "login recv");
1381 return;
1382 }
1383
1384 ib_dma_sync_single_for_cpu(ib_dev, isert_conn->login_desc->dma_addr,
1385 ISER_RX_SIZE, DMA_FROM_DEVICE);
1386
1387 isert_conn->login_req_len = wc->byte_len - ISER_HEADERS_LEN;
1388
1389 if (isert_conn->conn) {
1390 struct iscsi_login *login = isert_conn->conn->conn_login;
1391
1392 if (login && !login->first_request)
1393 isert_rx_login_req(isert_conn);
1394 }
1395
1396 mutex_lock(&isert_conn->mutex);
1397 complete(&isert_conn->login_req_comp);
1398 mutex_unlock(&isert_conn->mutex);
1399
1400 ib_dma_sync_single_for_device(ib_dev, isert_conn->login_desc->dma_addr,
1401 ISER_RX_SIZE, DMA_FROM_DEVICE);
1402}
1403
1404static void
1405isert_rdma_rw_ctx_destroy(struct isert_cmd *cmd, struct isert_conn *conn)
1406{
1407 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
1408 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
1409
1410 if (!cmd->rw.nr_ops)
1411 return;
1412
1413 if (isert_prot_cmd(conn, se_cmd)) {
1414 rdma_rw_ctx_destroy_signature(&cmd->rw, conn->qp,
1415 conn->cm_id->port_num, se_cmd->t_data_sg,
1416 se_cmd->t_data_nents, se_cmd->t_prot_sg,
1417 se_cmd->t_prot_nents, dir);
1418 } else {
1419 rdma_rw_ctx_destroy(&cmd->rw, conn->qp, conn->cm_id->port_num,
1420 se_cmd->t_data_sg, se_cmd->t_data_nents, dir);
1421 }
1422
1423 cmd->rw.nr_ops = 0;
1424}
1425
1426static void
1427isert_put_cmd(struct isert_cmd *isert_cmd, bool comp_err)
1428{
1429 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1430 struct isert_conn *isert_conn = isert_cmd->conn;
1431 struct iscsit_conn *conn = isert_conn->conn;
1432 struct iscsi_text_rsp *hdr;
1433
1434 isert_dbg("Cmd %p\n", isert_cmd);
1435
1436 switch (cmd->iscsi_opcode) {
1437 case ISCSI_OP_SCSI_CMD:
1438 spin_lock_bh(&conn->cmd_lock);
1439 if (!list_empty(&cmd->i_conn_node))
1440 list_del_init(&cmd->i_conn_node);
1441 spin_unlock_bh(&conn->cmd_lock);
1442
1443 if (cmd->data_direction == DMA_TO_DEVICE) {
1444 iscsit_stop_dataout_timer(cmd);
1445 /*
1446 * Check for special case during comp_err where
1447 * WRITE_PENDING has been handed off from core,
1448 * but requires an extra target_put_sess_cmd()
1449 * before transport_generic_free_cmd() below.
1450 */
1451 if (comp_err &&
1452 cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) {
1453 struct se_cmd *se_cmd = &cmd->se_cmd;
1454
1455 target_put_sess_cmd(se_cmd);
1456 }
1457 }
1458
1459 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1460 transport_generic_free_cmd(&cmd->se_cmd, 0);
1461 break;
1462 case ISCSI_OP_SCSI_TMFUNC:
1463 spin_lock_bh(&conn->cmd_lock);
1464 if (!list_empty(&cmd->i_conn_node))
1465 list_del_init(&cmd->i_conn_node);
1466 spin_unlock_bh(&conn->cmd_lock);
1467
1468 transport_generic_free_cmd(&cmd->se_cmd, 0);
1469 break;
1470 case ISCSI_OP_REJECT:
1471 case ISCSI_OP_NOOP_OUT:
1472 case ISCSI_OP_TEXT:
1473 hdr = (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1474 /* If the continue bit is on, keep the command alive */
1475 if (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)
1476 break;
1477
1478 spin_lock_bh(&conn->cmd_lock);
1479 if (!list_empty(&cmd->i_conn_node))
1480 list_del_init(&cmd->i_conn_node);
1481 spin_unlock_bh(&conn->cmd_lock);
1482
1483 /*
1484 * Handle special case for REJECT when iscsi_add_reject*() has
1485 * overwritten the original iscsi_opcode assignment, and the
1486 * associated cmd->se_cmd needs to be released.
1487 */
1488 if (cmd->se_cmd.se_tfo != NULL) {
1489 isert_dbg("Calling transport_generic_free_cmd for 0x%02x\n",
1490 cmd->iscsi_opcode);
1491 transport_generic_free_cmd(&cmd->se_cmd, 0);
1492 break;
1493 }
1494 fallthrough;
1495 default:
1496 iscsit_release_cmd(cmd);
1497 break;
1498 }
1499}
1500
1501static void
1502isert_unmap_tx_desc(struct iser_tx_desc *tx_desc, struct ib_device *ib_dev)
1503{
1504 if (tx_desc->dma_addr != 0) {
1505 isert_dbg("unmap single for tx_desc->dma_addr\n");
1506 ib_dma_unmap_single(ib_dev, tx_desc->dma_addr,
1507 ISER_HEADERS_LEN, DMA_TO_DEVICE);
1508 tx_desc->dma_addr = 0;
1509 }
1510}
1511
1512static void
1513isert_completion_put(struct iser_tx_desc *tx_desc, struct isert_cmd *isert_cmd,
1514 struct ib_device *ib_dev, bool comp_err)
1515{
1516 if (isert_cmd->pdu_buf_dma != 0) {
1517 isert_dbg("unmap single for isert_cmd->pdu_buf_dma\n");
1518 ib_dma_unmap_single(ib_dev, isert_cmd->pdu_buf_dma,
1519 isert_cmd->pdu_buf_len, DMA_TO_DEVICE);
1520 isert_cmd->pdu_buf_dma = 0;
1521 }
1522
1523 isert_unmap_tx_desc(tx_desc, ib_dev);
1524 isert_put_cmd(isert_cmd, comp_err);
1525}
1526
1527static int
1528isert_check_pi_status(struct se_cmd *se_cmd, struct ib_mr *sig_mr)
1529{
1530 struct ib_mr_status mr_status;
1531 int ret;
1532
1533 ret = ib_check_mr_status(sig_mr, IB_MR_CHECK_SIG_STATUS, &mr_status);
1534 if (ret) {
1535 isert_err("ib_check_mr_status failed, ret %d\n", ret);
1536 goto fail_mr_status;
1537 }
1538
1539 if (mr_status.fail_status & IB_MR_CHECK_SIG_STATUS) {
1540 u64 sec_offset_err;
1541 u32 block_size = se_cmd->se_dev->dev_attrib.block_size + 8;
1542
1543 switch (mr_status.sig_err.err_type) {
1544 case IB_SIG_BAD_GUARD:
1545 se_cmd->pi_err = TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED;
1546 break;
1547 case IB_SIG_BAD_REFTAG:
1548 se_cmd->pi_err = TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED;
1549 break;
1550 case IB_SIG_BAD_APPTAG:
1551 se_cmd->pi_err = TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED;
1552 break;
1553 }
1554 sec_offset_err = mr_status.sig_err.sig_err_offset;
1555 do_div(sec_offset_err, block_size);
1556 se_cmd->sense_info = sec_offset_err + se_cmd->t_task_lba;
1557
1558 isert_err("PI error found type %d at sector 0x%llx "
1559 "expected 0x%x vs actual 0x%x\n",
1560 mr_status.sig_err.err_type,
1561 (unsigned long long)se_cmd->sense_info,
1562 mr_status.sig_err.expected,
1563 mr_status.sig_err.actual);
1564 ret = 1;
1565 }
1566
1567fail_mr_status:
1568 return ret;
1569}
1570
1571static void
1572isert_rdma_write_done(struct ib_cq *cq, struct ib_wc *wc)
1573{
1574 struct isert_conn *isert_conn = wc->qp->qp_context;
1575 struct isert_device *device = isert_conn->device;
1576 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1577 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1578 struct se_cmd *cmd = &isert_cmd->iscsit_cmd->se_cmd;
1579 int ret = 0;
1580
1581 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1582 isert_print_wc(wc, "rdma write");
1583 if (wc->status != IB_WC_WR_FLUSH_ERR)
1584 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1585 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1586 return;
1587 }
1588
1589 isert_dbg("Cmd %p\n", isert_cmd);
1590
1591 ret = isert_check_pi_status(cmd, isert_cmd->rw.reg->mr);
1592 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1593
1594 if (ret) {
1595 /*
1596 * transport_generic_request_failure() expects to have
1597 * plus two references to handle queue-full, so re-add
1598 * one here as target-core will have already dropped
1599 * it after the first isert_put_datain() callback.
1600 */
1601 kref_get(&cmd->cmd_kref);
1602 transport_generic_request_failure(cmd, cmd->pi_err);
1603 } else {
1604 /*
1605 * XXX: isert_put_response() failure is not retried.
1606 */
1607 ret = isert_put_response(isert_conn->conn, isert_cmd->iscsit_cmd);
1608 if (ret)
1609 pr_warn_ratelimited("isert_put_response() ret: %d\n", ret);
1610 }
1611}
1612
1613static void
1614isert_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
1615{
1616 struct isert_conn *isert_conn = wc->qp->qp_context;
1617 struct isert_device *device = isert_conn->device;
1618 struct iser_tx_desc *desc = cqe_to_tx_desc(wc->wr_cqe);
1619 struct isert_cmd *isert_cmd = tx_desc_to_cmd(desc);
1620 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1621 struct se_cmd *se_cmd = &cmd->se_cmd;
1622 int ret = 0;
1623
1624 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1625 isert_print_wc(wc, "rdma read");
1626 if (wc->status != IB_WC_WR_FLUSH_ERR)
1627 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1628 isert_completion_put(desc, isert_cmd, device->ib_device, true);
1629 return;
1630 }
1631
1632 isert_dbg("Cmd %p\n", isert_cmd);
1633
1634 iscsit_stop_dataout_timer(cmd);
1635
1636 if (isert_prot_cmd(isert_conn, se_cmd))
1637 ret = isert_check_pi_status(se_cmd, isert_cmd->rw.reg->mr);
1638 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1639 cmd->write_data_done = 0;
1640
1641 isert_dbg("Cmd: %p RDMA_READ comp calling execute_cmd\n", isert_cmd);
1642 spin_lock_bh(&cmd->istate_lock);
1643 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1644 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1645 spin_unlock_bh(&cmd->istate_lock);
1646
1647 /*
1648 * transport_generic_request_failure() will drop the extra
1649 * se_cmd->cmd_kref reference after T10-PI error, and handle
1650 * any non-zero ->queue_status() callback error retries.
1651 */
1652 if (ret)
1653 transport_generic_request_failure(se_cmd, se_cmd->pi_err);
1654 else
1655 target_execute_cmd(se_cmd);
1656}
1657
1658static void
1659isert_do_control_comp(struct work_struct *work)
1660{
1661 struct isert_cmd *isert_cmd = container_of(work,
1662 struct isert_cmd, comp_work);
1663 struct isert_conn *isert_conn = isert_cmd->conn;
1664 struct ib_device *ib_dev = isert_conn->cm_id->device;
1665 struct iscsit_cmd *cmd = isert_cmd->iscsit_cmd;
1666
1667 isert_dbg("Cmd %p i_state %d\n", isert_cmd, cmd->i_state);
1668
1669 switch (cmd->i_state) {
1670 case ISTATE_SEND_TASKMGTRSP:
1671 iscsit_tmr_post_handler(cmd, cmd->conn);
1672 fallthrough;
1673 case ISTATE_SEND_REJECT:
1674 case ISTATE_SEND_TEXTRSP:
1675 cmd->i_state = ISTATE_SENT_STATUS;
1676 isert_completion_put(&isert_cmd->tx_desc, isert_cmd,
1677 ib_dev, false);
1678 break;
1679 case ISTATE_SEND_LOGOUTRSP:
1680 iscsit_logout_post_handler(cmd, cmd->conn);
1681 break;
1682 default:
1683 isert_err("Unknown i_state %d\n", cmd->i_state);
1684 dump_stack();
1685 break;
1686 }
1687}
1688
1689static void
1690isert_login_send_done(struct ib_cq *cq, struct ib_wc *wc)
1691{
1692 struct isert_conn *isert_conn = wc->qp->qp_context;
1693 struct ib_device *ib_dev = isert_conn->cm_id->device;
1694 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1695
1696 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1697 isert_print_wc(wc, "login send");
1698 if (wc->status != IB_WC_WR_FLUSH_ERR)
1699 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1700 }
1701
1702 isert_unmap_tx_desc(tx_desc, ib_dev);
1703}
1704
1705static void
1706isert_send_done(struct ib_cq *cq, struct ib_wc *wc)
1707{
1708 struct isert_conn *isert_conn = wc->qp->qp_context;
1709 struct ib_device *ib_dev = isert_conn->cm_id->device;
1710 struct iser_tx_desc *tx_desc = cqe_to_tx_desc(wc->wr_cqe);
1711 struct isert_cmd *isert_cmd = tx_desc_to_cmd(tx_desc);
1712
1713 if (unlikely(wc->status != IB_WC_SUCCESS)) {
1714 isert_print_wc(wc, "send");
1715 if (wc->status != IB_WC_WR_FLUSH_ERR)
1716 iscsit_cause_connection_reinstatement(isert_conn->conn, 0);
1717 isert_completion_put(tx_desc, isert_cmd, ib_dev, true);
1718 return;
1719 }
1720
1721 isert_dbg("Cmd %p\n", isert_cmd);
1722
1723 switch (isert_cmd->iscsit_cmd->i_state) {
1724 case ISTATE_SEND_TASKMGTRSP:
1725 case ISTATE_SEND_LOGOUTRSP:
1726 case ISTATE_SEND_REJECT:
1727 case ISTATE_SEND_TEXTRSP:
1728 isert_unmap_tx_desc(tx_desc, ib_dev);
1729
1730 INIT_WORK(&isert_cmd->comp_work, isert_do_control_comp);
1731 queue_work(isert_comp_wq, &isert_cmd->comp_work);
1732 return;
1733 default:
1734 isert_cmd->iscsit_cmd->i_state = ISTATE_SENT_STATUS;
1735 isert_completion_put(tx_desc, isert_cmd, ib_dev, false);
1736 break;
1737 }
1738}
1739
1740static int
1741isert_post_response(struct isert_conn *isert_conn, struct isert_cmd *isert_cmd)
1742{
1743 int ret;
1744
1745 ret = isert_post_recv(isert_conn, isert_cmd->rx_desc);
1746 if (ret)
1747 return ret;
1748
1749 ret = ib_post_send(isert_conn->qp, &isert_cmd->tx_desc.send_wr, NULL);
1750 if (ret) {
1751 isert_err("ib_post_send failed with %d\n", ret);
1752 return ret;
1753 }
1754 return ret;
1755}
1756
1757static int
1758isert_put_response(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1759{
1760 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1761 struct isert_conn *isert_conn = conn->context;
1762 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1763 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)
1764 &isert_cmd->tx_desc.iscsi_header;
1765
1766 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1767 iscsit_build_rsp_pdu(cmd, conn, true, hdr);
1768 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1769 /*
1770 * Attach SENSE DATA payload to iSCSI Response PDU
1771 */
1772 if (cmd->se_cmd.sense_buffer &&
1773 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1774 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
1775 struct isert_device *device = isert_conn->device;
1776 struct ib_device *ib_dev = device->ib_device;
1777 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1778 u32 padding, pdu_len;
1779
1780 put_unaligned_be16(cmd->se_cmd.scsi_sense_length,
1781 cmd->sense_buffer);
1782 cmd->se_cmd.scsi_sense_length += sizeof(__be16);
1783
1784 padding = -(cmd->se_cmd.scsi_sense_length) & 3;
1785 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
1786 pdu_len = cmd->se_cmd.scsi_sense_length + padding;
1787
1788 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1789 (void *)cmd->sense_buffer, pdu_len,
1790 DMA_TO_DEVICE);
1791 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1792 return -ENOMEM;
1793
1794 isert_cmd->pdu_buf_len = pdu_len;
1795 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1796 tx_dsg->length = pdu_len;
1797 tx_dsg->lkey = device->pd->local_dma_lkey;
1798 isert_cmd->tx_desc.num_sge = 2;
1799 }
1800
1801 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1802
1803 isert_dbg("Posting SCSI Response\n");
1804
1805 return isert_post_response(isert_conn, isert_cmd);
1806}
1807
1808static void
1809isert_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
1810{
1811 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1812 struct isert_conn *isert_conn = conn->context;
1813
1814 spin_lock_bh(&conn->cmd_lock);
1815 if (!list_empty(&cmd->i_conn_node))
1816 list_del_init(&cmd->i_conn_node);
1817 spin_unlock_bh(&conn->cmd_lock);
1818
1819 if (cmd->data_direction == DMA_TO_DEVICE)
1820 iscsit_stop_dataout_timer(cmd);
1821 isert_rdma_rw_ctx_destroy(isert_cmd, isert_conn);
1822}
1823
1824static enum target_prot_op
1825isert_get_sup_prot_ops(struct iscsit_conn *conn)
1826{
1827 struct isert_conn *isert_conn = conn->context;
1828 struct isert_device *device = isert_conn->device;
1829
1830 if (conn->tpg->tpg_attrib.t10_pi) {
1831 if (device->pi_capable) {
1832 isert_info("conn %p PI offload enabled\n", isert_conn);
1833 isert_conn->pi_support = true;
1834 return TARGET_PROT_ALL;
1835 }
1836 }
1837
1838 isert_info("conn %p PI offload disabled\n", isert_conn);
1839 isert_conn->pi_support = false;
1840
1841 return TARGET_PROT_NORMAL;
1842}
1843
1844static int
1845isert_put_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn,
1846 bool nopout_response)
1847{
1848 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1849 struct isert_conn *isert_conn = conn->context;
1850 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1851
1852 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1853 iscsit_build_nopin_rsp(cmd, conn, (struct iscsi_nopin *)
1854 &isert_cmd->tx_desc.iscsi_header,
1855 nopout_response);
1856 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1857 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1858
1859 isert_dbg("conn %p Posting NOPIN Response\n", isert_conn);
1860
1861 return isert_post_response(isert_conn, isert_cmd);
1862}
1863
1864static int
1865isert_put_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1866{
1867 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1868 struct isert_conn *isert_conn = conn->context;
1869 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1870
1871 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1872 iscsit_build_logout_rsp(cmd, conn, (struct iscsi_logout_rsp *)
1873 &isert_cmd->tx_desc.iscsi_header);
1874 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1875 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1876
1877 isert_dbg("conn %p Posting Logout Response\n", isert_conn);
1878
1879 return isert_post_response(isert_conn, isert_cmd);
1880}
1881
1882static int
1883isert_put_tm_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1884{
1885 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1886 struct isert_conn *isert_conn = conn->context;
1887 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1888
1889 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1890 iscsit_build_task_mgt_rsp(cmd, conn, (struct iscsi_tm_rsp *)
1891 &isert_cmd->tx_desc.iscsi_header);
1892 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1893 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1894
1895 isert_dbg("conn %p Posting Task Management Response\n", isert_conn);
1896
1897 return isert_post_response(isert_conn, isert_cmd);
1898}
1899
1900static int
1901isert_put_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1902{
1903 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1904 struct isert_conn *isert_conn = conn->context;
1905 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1906 struct isert_device *device = isert_conn->device;
1907 struct ib_device *ib_dev = device->ib_device;
1908 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1909 struct iscsi_reject *hdr =
1910 (struct iscsi_reject *)&isert_cmd->tx_desc.iscsi_header;
1911
1912 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1913 iscsit_build_reject(cmd, conn, hdr);
1914 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1915
1916 hton24(hdr->dlength, ISCSI_HDR_LEN);
1917 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1918 (void *)cmd->buf_ptr, ISCSI_HDR_LEN,
1919 DMA_TO_DEVICE);
1920 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1921 return -ENOMEM;
1922 isert_cmd->pdu_buf_len = ISCSI_HDR_LEN;
1923 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1924 tx_dsg->length = ISCSI_HDR_LEN;
1925 tx_dsg->lkey = device->pd->local_dma_lkey;
1926 isert_cmd->tx_desc.num_sge = 2;
1927
1928 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1929
1930 isert_dbg("conn %p Posting Reject\n", isert_conn);
1931
1932 return isert_post_response(isert_conn, isert_cmd);
1933}
1934
1935static int
1936isert_put_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn)
1937{
1938 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
1939 struct isert_conn *isert_conn = conn->context;
1940 struct ib_send_wr *send_wr = &isert_cmd->tx_desc.send_wr;
1941 struct iscsi_text_rsp *hdr =
1942 (struct iscsi_text_rsp *)&isert_cmd->tx_desc.iscsi_header;
1943 u32 txt_rsp_len;
1944 int rc;
1945
1946 isert_create_send_desc(isert_conn, isert_cmd, &isert_cmd->tx_desc);
1947 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_INFINIBAND);
1948 if (rc < 0)
1949 return rc;
1950
1951 txt_rsp_len = rc;
1952 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
1953
1954 if (txt_rsp_len) {
1955 struct isert_device *device = isert_conn->device;
1956 struct ib_device *ib_dev = device->ib_device;
1957 struct ib_sge *tx_dsg = &isert_cmd->tx_desc.tx_sg[1];
1958 void *txt_rsp_buf = cmd->buf_ptr;
1959
1960 isert_cmd->pdu_buf_dma = ib_dma_map_single(ib_dev,
1961 txt_rsp_buf, txt_rsp_len, DMA_TO_DEVICE);
1962 if (ib_dma_mapping_error(ib_dev, isert_cmd->pdu_buf_dma))
1963 return -ENOMEM;
1964
1965 isert_cmd->pdu_buf_len = txt_rsp_len;
1966 tx_dsg->addr = isert_cmd->pdu_buf_dma;
1967 tx_dsg->length = txt_rsp_len;
1968 tx_dsg->lkey = device->pd->local_dma_lkey;
1969 isert_cmd->tx_desc.num_sge = 2;
1970 }
1971 isert_init_send_wr(isert_conn, isert_cmd, send_wr);
1972
1973 isert_dbg("conn %p Text Response\n", isert_conn);
1974
1975 return isert_post_response(isert_conn, isert_cmd);
1976}
1977
1978static inline void
1979isert_set_dif_domain(struct se_cmd *se_cmd, struct ib_sig_domain *domain)
1980{
1981 domain->sig_type = IB_SIG_TYPE_T10_DIF;
1982 domain->sig.dif.bg_type = IB_T10DIF_CRC;
1983 domain->sig.dif.pi_interval = se_cmd->se_dev->dev_attrib.block_size;
1984 domain->sig.dif.ref_tag = se_cmd->reftag_seed;
1985 /*
1986 * At the moment we hard code those, but if in the future
1987 * the target core would like to use it, we will take it
1988 * from se_cmd.
1989 */
1990 domain->sig.dif.apptag_check_mask = 0xffff;
1991 domain->sig.dif.app_escape = true;
1992 domain->sig.dif.ref_escape = true;
1993 if (se_cmd->prot_type == TARGET_DIF_TYPE1_PROT ||
1994 se_cmd->prot_type == TARGET_DIF_TYPE2_PROT)
1995 domain->sig.dif.ref_remap = true;
1996}
1997
1998static int
1999isert_set_sig_attrs(struct se_cmd *se_cmd, struct ib_sig_attrs *sig_attrs)
2000{
2001 memset(sig_attrs, 0, sizeof(*sig_attrs));
2002
2003 switch (se_cmd->prot_op) {
2004 case TARGET_PROT_DIN_INSERT:
2005 case TARGET_PROT_DOUT_STRIP:
2006 sig_attrs->mem.sig_type = IB_SIG_TYPE_NONE;
2007 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2008 break;
2009 case TARGET_PROT_DOUT_INSERT:
2010 case TARGET_PROT_DIN_STRIP:
2011 sig_attrs->wire.sig_type = IB_SIG_TYPE_NONE;
2012 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2013 break;
2014 case TARGET_PROT_DIN_PASS:
2015 case TARGET_PROT_DOUT_PASS:
2016 isert_set_dif_domain(se_cmd, &sig_attrs->wire);
2017 isert_set_dif_domain(se_cmd, &sig_attrs->mem);
2018 break;
2019 default:
2020 isert_err("Unsupported PI operation %d\n", se_cmd->prot_op);
2021 return -EINVAL;
2022 }
2023
2024 if (se_cmd->prot_checks & TARGET_DIF_CHECK_GUARD)
2025 sig_attrs->check_mask |= IB_SIG_CHECK_GUARD;
2026 if (se_cmd->prot_checks & TARGET_DIF_CHECK_APPTAG)
2027 sig_attrs->check_mask |= IB_SIG_CHECK_APPTAG;
2028 if (se_cmd->prot_checks & TARGET_DIF_CHECK_REFTAG)
2029 sig_attrs->check_mask |= IB_SIG_CHECK_REFTAG;
2030
2031 return 0;
2032}
2033
2034static int
2035isert_rdma_rw_ctx_post(struct isert_cmd *cmd, struct isert_conn *conn,
2036 struct ib_cqe *cqe, struct ib_send_wr *chain_wr)
2037{
2038 struct se_cmd *se_cmd = &cmd->iscsit_cmd->se_cmd;
2039 enum dma_data_direction dir = target_reverse_dma_direction(se_cmd);
2040 u8 port_num = conn->cm_id->port_num;
2041 u64 addr;
2042 u32 rkey, offset;
2043 int ret;
2044
2045 if (cmd->ctx_init_done)
2046 goto rdma_ctx_post;
2047
2048 if (dir == DMA_FROM_DEVICE) {
2049 addr = cmd->write_va;
2050 rkey = cmd->write_stag;
2051 offset = cmd->iscsit_cmd->write_data_done;
2052 } else {
2053 addr = cmd->read_va;
2054 rkey = cmd->read_stag;
2055 offset = 0;
2056 }
2057
2058 if (isert_prot_cmd(conn, se_cmd)) {
2059 struct ib_sig_attrs sig_attrs;
2060
2061 ret = isert_set_sig_attrs(se_cmd, &sig_attrs);
2062 if (ret)
2063 return ret;
2064
2065 WARN_ON_ONCE(offset);
2066 ret = rdma_rw_ctx_signature_init(&cmd->rw, conn->qp, port_num,
2067 se_cmd->t_data_sg, se_cmd->t_data_nents,
2068 se_cmd->t_prot_sg, se_cmd->t_prot_nents,
2069 &sig_attrs, addr, rkey, dir);
2070 } else {
2071 ret = rdma_rw_ctx_init(&cmd->rw, conn->qp, port_num,
2072 se_cmd->t_data_sg, se_cmd->t_data_nents,
2073 offset, addr, rkey, dir);
2074 }
2075
2076 if (ret < 0) {
2077 isert_err("Cmd: %p failed to prepare RDMA res\n", cmd);
2078 return ret;
2079 }
2080
2081 cmd->ctx_init_done = true;
2082
2083rdma_ctx_post:
2084 ret = rdma_rw_ctx_post(&cmd->rw, conn->qp, port_num, cqe, chain_wr);
2085 if (ret < 0)
2086 isert_err("Cmd: %p failed to post RDMA res\n", cmd);
2087 return ret;
2088}
2089
2090static int
2091isert_put_datain(struct iscsit_conn *conn, struct iscsit_cmd *cmd)
2092{
2093 struct se_cmd *se_cmd = &cmd->se_cmd;
2094 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2095 struct isert_conn *isert_conn = conn->context;
2096 struct ib_cqe *cqe = NULL;
2097 struct ib_send_wr *chain_wr = NULL;
2098 int rc;
2099
2100 isert_dbg("Cmd: %p RDMA_WRITE data_length: %u\n",
2101 isert_cmd, se_cmd->data_length);
2102
2103 if (isert_prot_cmd(isert_conn, se_cmd)) {
2104 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_write_done;
2105 cqe = &isert_cmd->tx_desc.tx_cqe;
2106 } else {
2107 /*
2108 * Build isert_conn->tx_desc for iSCSI response PDU and attach
2109 */
2110 isert_create_send_desc(isert_conn, isert_cmd,
2111 &isert_cmd->tx_desc);
2112 iscsit_build_rsp_pdu(cmd, conn, true, (struct iscsi_scsi_rsp *)
2113 &isert_cmd->tx_desc.iscsi_header);
2114 isert_init_tx_hdrs(isert_conn, &isert_cmd->tx_desc);
2115 isert_init_send_wr(isert_conn, isert_cmd,
2116 &isert_cmd->tx_desc.send_wr);
2117
2118 rc = isert_post_recv(isert_conn, isert_cmd->rx_desc);
2119 if (rc)
2120 return rc;
2121
2122 chain_wr = &isert_cmd->tx_desc.send_wr;
2123 }
2124
2125 rc = isert_rdma_rw_ctx_post(isert_cmd, isert_conn, cqe, chain_wr);
2126 isert_dbg("Cmd: %p posted RDMA_WRITE for iSER Data READ rc: %d\n",
2127 isert_cmd, rc);
2128 return rc;
2129}
2130
2131static int
2132isert_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, bool recovery)
2133{
2134 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2135 int ret;
2136
2137 isert_dbg("Cmd: %p RDMA_READ data_length: %u write_data_done: %u\n",
2138 isert_cmd, cmd->se_cmd.data_length, cmd->write_data_done);
2139
2140 isert_cmd->tx_desc.tx_cqe.done = isert_rdma_read_done;
2141 ret = isert_rdma_rw_ctx_post(isert_cmd, conn->context,
2142 &isert_cmd->tx_desc.tx_cqe, NULL);
2143
2144 isert_dbg("Cmd: %p posted RDMA_READ memory for ISER Data WRITE rc: %d\n",
2145 isert_cmd, ret);
2146 return ret;
2147}
2148
2149static int
2150isert_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2151{
2152 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2153 int ret = 0;
2154
2155 switch (state) {
2156 case ISTATE_REMOVE:
2157 spin_lock_bh(&conn->cmd_lock);
2158 list_del_init(&cmd->i_conn_node);
2159 spin_unlock_bh(&conn->cmd_lock);
2160 isert_put_cmd(isert_cmd, true);
2161 break;
2162 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
2163 ret = isert_put_nopin(cmd, conn, false);
2164 break;
2165 default:
2166 isert_err("Unknown immediate state: 0x%02x\n", state);
2167 ret = -EINVAL;
2168 break;
2169 }
2170
2171 return ret;
2172}
2173
2174static int
2175isert_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state)
2176{
2177 struct isert_conn *isert_conn = conn->context;
2178 int ret;
2179
2180 switch (state) {
2181 case ISTATE_SEND_LOGOUTRSP:
2182 ret = isert_put_logout_rsp(cmd, conn);
2183 if (!ret)
2184 isert_conn->logout_posted = true;
2185 break;
2186 case ISTATE_SEND_NOPIN:
2187 ret = isert_put_nopin(cmd, conn, true);
2188 break;
2189 case ISTATE_SEND_TASKMGTRSP:
2190 ret = isert_put_tm_rsp(cmd, conn);
2191 break;
2192 case ISTATE_SEND_REJECT:
2193 ret = isert_put_reject(cmd, conn);
2194 break;
2195 case ISTATE_SEND_TEXTRSP:
2196 ret = isert_put_text_rsp(cmd, conn);
2197 break;
2198 case ISTATE_SEND_STATUS:
2199 /*
2200 * Special case for sending non GOOD SCSI status from TX thread
2201 * context during pre se_cmd excecution failure.
2202 */
2203 ret = isert_put_response(conn, cmd);
2204 break;
2205 default:
2206 isert_err("Unknown response state: 0x%02x\n", state);
2207 ret = -EINVAL;
2208 break;
2209 }
2210
2211 return ret;
2212}
2213
2214struct rdma_cm_id *
2215isert_setup_id(struct isert_np *isert_np)
2216{
2217 struct iscsi_np *np = isert_np->np;
2218 struct rdma_cm_id *id;
2219 struct sockaddr *sa;
2220 int ret;
2221
2222 sa = (struct sockaddr *)&np->np_sockaddr;
2223 isert_dbg("ksockaddr: %p, sa: %p\n", &np->np_sockaddr, sa);
2224
2225 id = rdma_create_id(&init_net, isert_cma_handler, isert_np,
2226 RDMA_PS_TCP, IB_QPT_RC);
2227 if (IS_ERR(id)) {
2228 isert_err("rdma_create_id() failed: %ld\n", PTR_ERR(id));
2229 ret = PTR_ERR(id);
2230 goto out;
2231 }
2232 isert_dbg("id %p context %p\n", id, id->context);
2233
2234 /*
2235 * Allow both IPv4 and IPv6 sockets to bind a single port
2236 * at the same time.
2237 */
2238 ret = rdma_set_afonly(id, 1);
2239 if (ret) {
2240 isert_err("rdma_set_afonly() failed: %d\n", ret);
2241 goto out_id;
2242 }
2243
2244 ret = rdma_bind_addr(id, sa);
2245 if (ret) {
2246 isert_err("rdma_bind_addr() failed: %d\n", ret);
2247 goto out_id;
2248 }
2249
2250 ret = rdma_listen(id, 0);
2251 if (ret) {
2252 isert_err("rdma_listen() failed: %d\n", ret);
2253 goto out_id;
2254 }
2255
2256 return id;
2257out_id:
2258 rdma_destroy_id(id);
2259out:
2260 return ERR_PTR(ret);
2261}
2262
2263static int
2264isert_setup_np(struct iscsi_np *np,
2265 struct sockaddr_storage *ksockaddr)
2266{
2267 struct isert_np *isert_np;
2268 struct rdma_cm_id *isert_lid;
2269 int ret;
2270
2271 isert_np = kzalloc(sizeof(struct isert_np), GFP_KERNEL);
2272 if (!isert_np)
2273 return -ENOMEM;
2274
2275 sema_init(&isert_np->sem, 0);
2276 mutex_init(&isert_np->mutex);
2277 INIT_LIST_HEAD(&isert_np->accepted);
2278 INIT_LIST_HEAD(&isert_np->pending);
2279 isert_np->np = np;
2280
2281 /*
2282 * Setup the np->np_sockaddr from the passed sockaddr setup
2283 * in iscsi_target_configfs.c code..
2284 */
2285 memcpy(&np->np_sockaddr, ksockaddr,
2286 sizeof(struct sockaddr_storage));
2287
2288 isert_lid = isert_setup_id(isert_np);
2289 if (IS_ERR(isert_lid)) {
2290 ret = PTR_ERR(isert_lid);
2291 goto out;
2292 }
2293
2294 isert_np->cm_id = isert_lid;
2295 np->np_context = isert_np;
2296
2297 return 0;
2298
2299out:
2300 kfree(isert_np);
2301
2302 return ret;
2303}
2304
2305static int
2306isert_rdma_accept(struct isert_conn *isert_conn)
2307{
2308 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2309 struct rdma_conn_param cp;
2310 int ret;
2311 struct iser_cm_hdr rsp_hdr;
2312
2313 memset(&cp, 0, sizeof(struct rdma_conn_param));
2314 cp.initiator_depth = isert_conn->initiator_depth;
2315 cp.retry_count = 7;
2316 cp.rnr_retry_count = 7;
2317
2318 memset(&rsp_hdr, 0, sizeof(rsp_hdr));
2319 rsp_hdr.flags = ISERT_ZBVA_NOT_USED;
2320 if (!isert_conn->snd_w_inv)
2321 rsp_hdr.flags = rsp_hdr.flags | ISERT_SEND_W_INV_NOT_USED;
2322 cp.private_data = (void *)&rsp_hdr;
2323 cp.private_data_len = sizeof(rsp_hdr);
2324
2325 ret = rdma_accept(cm_id, &cp);
2326 if (ret) {
2327 isert_err("rdma_accept() failed with: %d\n", ret);
2328 return ret;
2329 }
2330
2331 return 0;
2332}
2333
2334static int
2335isert_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
2336{
2337 struct isert_conn *isert_conn = conn->context;
2338 int ret;
2339
2340 isert_info("before login_req comp conn: %p\n", isert_conn);
2341 ret = wait_for_completion_interruptible(&isert_conn->login_req_comp);
2342 if (ret) {
2343 isert_err("isert_conn %p interrupted before got login req\n",
2344 isert_conn);
2345 return ret;
2346 }
2347 reinit_completion(&isert_conn->login_req_comp);
2348
2349 /*
2350 * For login requests after the first PDU, isert_rx_login_req() will
2351 * kick queue_delayed_work(isert_login_wq, &conn->login_work) as
2352 * the packet is received, which turns this callback from
2353 * iscsi_target_do_login_rx() into a NOP.
2354 */
2355 if (!login->first_request)
2356 return 0;
2357
2358 isert_rx_login_req(isert_conn);
2359
2360 isert_info("before login_comp conn: %p\n", conn);
2361 ret = wait_for_completion_interruptible(&isert_conn->login_comp);
2362 if (ret)
2363 return ret;
2364
2365 isert_info("processing login->req: %p\n", login->req);
2366
2367 return 0;
2368}
2369
2370static void
2371isert_set_conn_info(struct iscsi_np *np, struct iscsit_conn *conn,
2372 struct isert_conn *isert_conn)
2373{
2374 struct rdma_cm_id *cm_id = isert_conn->cm_id;
2375 struct rdma_route *cm_route = &cm_id->route;
2376
2377 conn->login_family = np->np_sockaddr.ss_family;
2378
2379 conn->login_sockaddr = cm_route->addr.dst_addr;
2380 conn->local_sockaddr = cm_route->addr.src_addr;
2381}
2382
2383static int
2384isert_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
2385{
2386 struct isert_np *isert_np = np->np_context;
2387 struct isert_conn *isert_conn;
2388 int ret;
2389
2390accept_wait:
2391 ret = down_interruptible(&isert_np->sem);
2392 if (ret)
2393 return -ENODEV;
2394
2395 spin_lock_bh(&np->np_thread_lock);
2396 if (np->np_thread_state >= ISCSI_NP_THREAD_RESET) {
2397 spin_unlock_bh(&np->np_thread_lock);
2398 isert_dbg("np_thread_state %d\n",
2399 np->np_thread_state);
2400 /*
2401 * No point in stalling here when np_thread
2402 * is in state RESET/SHUTDOWN/EXIT - bail
2403 */
2404 return -ENODEV;
2405 }
2406 spin_unlock_bh(&np->np_thread_lock);
2407
2408 mutex_lock(&isert_np->mutex);
2409 if (list_empty(&isert_np->pending)) {
2410 mutex_unlock(&isert_np->mutex);
2411 goto accept_wait;
2412 }
2413 isert_conn = list_first_entry(&isert_np->pending,
2414 struct isert_conn, node);
2415 list_del_init(&isert_conn->node);
2416 mutex_unlock(&isert_np->mutex);
2417
2418 conn->context = isert_conn;
2419 isert_conn->conn = conn;
2420 isert_conn->state = ISER_CONN_BOUND;
2421
2422 isert_set_conn_info(np, conn, isert_conn);
2423
2424 isert_dbg("Processing isert_conn: %p\n", isert_conn);
2425
2426 return 0;
2427}
2428
2429static void
2430isert_free_np(struct iscsi_np *np)
2431{
2432 struct isert_np *isert_np = np->np_context;
2433 struct isert_conn *isert_conn, *n;
2434
2435 if (isert_np->cm_id)
2436 rdma_destroy_id(isert_np->cm_id);
2437
2438 /*
2439 * FIXME: At this point we don't have a good way to insure
2440 * that at this point we don't have hanging connections that
2441 * completed RDMA establishment but didn't start iscsi login
2442 * process. So work-around this by cleaning up what ever piled
2443 * up in accepted and pending lists.
2444 */
2445 mutex_lock(&isert_np->mutex);
2446 if (!list_empty(&isert_np->pending)) {
2447 isert_info("Still have isert pending connections\n");
2448 list_for_each_entry_safe(isert_conn, n,
2449 &isert_np->pending,
2450 node) {
2451 isert_info("cleaning isert_conn %p state (%d)\n",
2452 isert_conn, isert_conn->state);
2453 isert_connect_release(isert_conn);
2454 }
2455 }
2456
2457 if (!list_empty(&isert_np->accepted)) {
2458 isert_info("Still have isert accepted connections\n");
2459 list_for_each_entry_safe(isert_conn, n,
2460 &isert_np->accepted,
2461 node) {
2462 isert_info("cleaning isert_conn %p state (%d)\n",
2463 isert_conn, isert_conn->state);
2464 isert_connect_release(isert_conn);
2465 }
2466 }
2467 mutex_unlock(&isert_np->mutex);
2468
2469 np->np_context = NULL;
2470 kfree(isert_np);
2471}
2472
2473static void isert_release_work(struct work_struct *work)
2474{
2475 struct isert_conn *isert_conn = container_of(work,
2476 struct isert_conn,
2477 release_work);
2478
2479 isert_info("Starting release conn %p\n", isert_conn);
2480
2481 mutex_lock(&isert_conn->mutex);
2482 isert_conn->state = ISER_CONN_DOWN;
2483 mutex_unlock(&isert_conn->mutex);
2484
2485 isert_info("Destroying conn %p\n", isert_conn);
2486 isert_put_conn(isert_conn);
2487}
2488
2489static void
2490isert_wait4logout(struct isert_conn *isert_conn)
2491{
2492 struct iscsit_conn *conn = isert_conn->conn;
2493
2494 isert_info("conn %p\n", isert_conn);
2495
2496 if (isert_conn->logout_posted) {
2497 isert_info("conn %p wait for conn_logout_comp\n", isert_conn);
2498 wait_for_completion_timeout(&conn->conn_logout_comp,
2499 SECONDS_FOR_LOGOUT_COMP * HZ);
2500 }
2501}
2502
2503static void
2504isert_wait4cmds(struct iscsit_conn *conn)
2505{
2506 isert_info("iscsit_conn %p\n", conn);
2507
2508 if (conn->sess) {
2509 target_stop_session(conn->sess->se_sess);
2510 target_wait_for_sess_cmds(conn->sess->se_sess);
2511 }
2512}
2513
2514/**
2515 * isert_put_unsol_pending_cmds() - Drop commands waiting for
2516 * unsolicitate dataout
2517 * @conn: iscsi connection
2518 *
2519 * We might still have commands that are waiting for unsolicited
2520 * dataouts messages. We must put the extra reference on those
2521 * before blocking on the target_wait_for_session_cmds
2522 */
2523static void
2524isert_put_unsol_pending_cmds(struct iscsit_conn *conn)
2525{
2526 struct iscsit_cmd *cmd, *tmp;
2527 static LIST_HEAD(drop_cmd_list);
2528
2529 spin_lock_bh(&conn->cmd_lock);
2530 list_for_each_entry_safe(cmd, tmp, &conn->conn_cmd_list, i_conn_node) {
2531 if ((cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA) &&
2532 (cmd->write_data_done < conn->sess->sess_ops->FirstBurstLength) &&
2533 (cmd->write_data_done < cmd->se_cmd.data_length))
2534 list_move_tail(&cmd->i_conn_node, &drop_cmd_list);
2535 }
2536 spin_unlock_bh(&conn->cmd_lock);
2537
2538 list_for_each_entry_safe(cmd, tmp, &drop_cmd_list, i_conn_node) {
2539 list_del_init(&cmd->i_conn_node);
2540 if (cmd->i_state != ISTATE_REMOVE) {
2541 struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
2542
2543 isert_info("conn %p dropping cmd %p\n", conn, cmd);
2544 isert_put_cmd(isert_cmd, true);
2545 }
2546 }
2547}
2548
2549static void isert_wait_conn(struct iscsit_conn *conn)
2550{
2551 struct isert_conn *isert_conn = conn->context;
2552
2553 isert_info("Starting conn %p\n", isert_conn);
2554
2555 mutex_lock(&isert_conn->mutex);
2556 isert_conn_terminate(isert_conn);
2557 mutex_unlock(&isert_conn->mutex);
2558
2559 ib_drain_qp(isert_conn->qp);
2560 isert_put_unsol_pending_cmds(conn);
2561 isert_wait4cmds(conn);
2562 isert_wait4logout(isert_conn);
2563
2564 queue_work(isert_release_wq, &isert_conn->release_work);
2565}
2566
2567static void isert_free_conn(struct iscsit_conn *conn)
2568{
2569 struct isert_conn *isert_conn = conn->context;
2570
2571 ib_drain_qp(isert_conn->qp);
2572 isert_put_conn(isert_conn);
2573}
2574
2575static void isert_get_rx_pdu(struct iscsit_conn *conn)
2576{
2577 struct completion comp;
2578
2579 init_completion(&comp);
2580
2581 wait_for_completion_interruptible(&comp);
2582}
2583
2584static struct iscsit_transport iser_target_transport = {
2585 .name = "IB/iSER",
2586 .transport_type = ISCSI_INFINIBAND,
2587 .rdma_shutdown = true,
2588 .priv_size = sizeof(struct isert_cmd),
2589 .owner = THIS_MODULE,
2590 .iscsit_setup_np = isert_setup_np,
2591 .iscsit_accept_np = isert_accept_np,
2592 .iscsit_free_np = isert_free_np,
2593 .iscsit_wait_conn = isert_wait_conn,
2594 .iscsit_free_conn = isert_free_conn,
2595 .iscsit_get_login_rx = isert_get_login_rx,
2596 .iscsit_put_login_tx = isert_put_login_tx,
2597 .iscsit_immediate_queue = isert_immediate_queue,
2598 .iscsit_response_queue = isert_response_queue,
2599 .iscsit_get_dataout = isert_get_dataout,
2600 .iscsit_queue_data_in = isert_put_datain,
2601 .iscsit_queue_status = isert_put_response,
2602 .iscsit_aborted_task = isert_aborted_task,
2603 .iscsit_get_rx_pdu = isert_get_rx_pdu,
2604 .iscsit_get_sup_prot_ops = isert_get_sup_prot_ops,
2605};
2606
2607static int __init isert_init(void)
2608{
2609 isert_login_wq = alloc_workqueue("isert_login_wq", 0, 0);
2610 if (!isert_login_wq) {
2611 isert_err("Unable to allocate isert_login_wq\n");
2612 return -ENOMEM;
2613 }
2614
2615 isert_comp_wq = alloc_workqueue("isert_comp_wq",
2616 WQ_UNBOUND | WQ_HIGHPRI, 0);
2617 if (!isert_comp_wq) {
2618 isert_err("Unable to allocate isert_comp_wq\n");
2619 goto destroy_login_wq;
2620 }
2621
2622 isert_release_wq = alloc_workqueue("isert_release_wq", WQ_UNBOUND,
2623 WQ_UNBOUND_MAX_ACTIVE);
2624 if (!isert_release_wq) {
2625 isert_err("Unable to allocate isert_release_wq\n");
2626 goto destroy_comp_wq;
2627 }
2628
2629 iscsit_register_transport(&iser_target_transport);
2630 isert_info("iSER_TARGET[0] - Loaded iser_target_transport\n");
2631
2632 return 0;
2633
2634destroy_comp_wq:
2635 destroy_workqueue(isert_comp_wq);
2636destroy_login_wq:
2637 destroy_workqueue(isert_login_wq);
2638
2639 return -ENOMEM;
2640}
2641
2642static void __exit isert_exit(void)
2643{
2644 flush_workqueue(isert_login_wq);
2645 destroy_workqueue(isert_release_wq);
2646 destroy_workqueue(isert_comp_wq);
2647 iscsit_unregister_transport(&iser_target_transport);
2648 isert_info("iSER_TARGET[0] - Released iser_target_transport\n");
2649 destroy_workqueue(isert_login_wq);
2650}
2651
2652MODULE_DESCRIPTION("iSER-Target for mainline target infrastructure");
2653MODULE_AUTHOR("nab@Linux-iSCSI.org");
2654MODULE_LICENSE("GPL");
2655
2656module_init(isert_init);
2657module_exit(isert_exit);