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

source code of linux/drivers/infiniband/ulp/isert/ib_isert.c