1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
2
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Fredy Neeser */
5 /* Greg Joyce <greg@opengridcomputing.com> */
6 /* Copyright (c) 2008-2019, IBM Corporation */
7 /* Copyright (c) 2017, Open Grid Computing, Inc. */
8
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/net.h>
12 #include <linux/inetdevice.h>
13 #include <net/addrconf.h>
14 #include <linux/workqueue.h>
15 #include <net/sock.h>
16 #include <net/tcp.h>
17 #include <linux/inet.h>
18 #include <linux/tcp.h>
19
20 #include <rdma/iw_cm.h>
21 #include <rdma/ib_verbs.h>
22 #include <rdma/ib_user_verbs.h>
23
24 #include "siw.h"
25 #include "siw_cm.h"
26
27 /*
28 * Set to any combination of
29 * MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
30 */
31 static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
32 static const bool relaxed_ird_negotiation = true;
33
34 static void siw_cm_llp_state_change(struct sock *s);
35 static void siw_cm_llp_data_ready(struct sock *s);
36 static void siw_cm_llp_write_space(struct sock *s);
37 static void siw_cm_llp_error_report(struct sock *s);
38 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
39 int status);
40
siw_sk_assign_cm_upcalls(struct sock * sk)41 static void siw_sk_assign_cm_upcalls(struct sock *sk)
42 {
43 write_lock_bh(&sk->sk_callback_lock);
44 sk->sk_state_change = siw_cm_llp_state_change;
45 sk->sk_data_ready = siw_cm_llp_data_ready;
46 sk->sk_write_space = siw_cm_llp_write_space;
47 sk->sk_error_report = siw_cm_llp_error_report;
48 write_unlock_bh(&sk->sk_callback_lock);
49 }
50
siw_sk_save_upcalls(struct sock * sk)51 static void siw_sk_save_upcalls(struct sock *sk)
52 {
53 struct siw_cep *cep = sk_to_cep(sk);
54
55 write_lock_bh(&sk->sk_callback_lock);
56 cep->sk_state_change = sk->sk_state_change;
57 cep->sk_data_ready = sk->sk_data_ready;
58 cep->sk_write_space = sk->sk_write_space;
59 cep->sk_error_report = sk->sk_error_report;
60 write_unlock_bh(&sk->sk_callback_lock);
61 }
62
siw_sk_restore_upcalls(struct sock * sk,struct siw_cep * cep)63 static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
64 {
65 sk->sk_state_change = cep->sk_state_change;
66 sk->sk_data_ready = cep->sk_data_ready;
67 sk->sk_write_space = cep->sk_write_space;
68 sk->sk_error_report = cep->sk_error_report;
69 sk->sk_user_data = NULL;
70 }
71
siw_qp_socket_assoc(struct siw_cep * cep,struct siw_qp * qp)72 static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
73 {
74 struct socket *s = cep->sock;
75 struct sock *sk = s->sk;
76
77 write_lock_bh(&sk->sk_callback_lock);
78
79 qp->attrs.sk = s;
80 sk->sk_data_ready = siw_qp_llp_data_ready;
81 sk->sk_write_space = siw_qp_llp_write_space;
82
83 write_unlock_bh(&sk->sk_callback_lock);
84 }
85
siw_socket_disassoc(struct socket * s)86 static void siw_socket_disassoc(struct socket *s)
87 {
88 struct sock *sk = s->sk;
89 struct siw_cep *cep;
90
91 if (sk) {
92 write_lock_bh(&sk->sk_callback_lock);
93 cep = sk_to_cep(sk);
94 if (cep) {
95 siw_sk_restore_upcalls(sk, cep);
96 siw_cep_put(cep);
97 } else {
98 pr_warn("siw: cannot restore sk callbacks: no ep\n");
99 }
100 write_unlock_bh(&sk->sk_callback_lock);
101 } else {
102 pr_warn("siw: cannot restore sk callbacks: no sk\n");
103 }
104 }
105
siw_rtr_data_ready(struct sock * sk)106 static void siw_rtr_data_ready(struct sock *sk)
107 {
108 struct siw_cep *cep;
109 struct siw_qp *qp = NULL;
110 read_descriptor_t rd_desc;
111
112 read_lock(&sk->sk_callback_lock);
113
114 cep = sk_to_cep(sk);
115 if (!cep) {
116 WARN(1, "No connection endpoint\n");
117 goto out;
118 }
119 qp = sk_to_qp(sk);
120
121 memset(&rd_desc, 0, sizeof(rd_desc));
122 rd_desc.arg.data = qp;
123 rd_desc.count = 1;
124
125 tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
126 /*
127 * Check if first frame was successfully processed.
128 * Signal connection full establishment if yes.
129 * Failed data processing would have already scheduled
130 * connection drop.
131 */
132 if (!qp->rx_stream.rx_suspend)
133 siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
134 out:
135 read_unlock(&sk->sk_callback_lock);
136 if (qp)
137 siw_qp_socket_assoc(cep, qp);
138 }
139
siw_sk_assign_rtr_upcalls(struct siw_cep * cep)140 static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
141 {
142 struct sock *sk = cep->sock->sk;
143
144 write_lock_bh(&sk->sk_callback_lock);
145 sk->sk_data_ready = siw_rtr_data_ready;
146 sk->sk_write_space = siw_qp_llp_write_space;
147 write_unlock_bh(&sk->sk_callback_lock);
148 }
149
siw_cep_socket_assoc(struct siw_cep * cep,struct socket * s)150 static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
151 {
152 cep->sock = s;
153 siw_cep_get(cep);
154 s->sk->sk_user_data = cep;
155
156 siw_sk_save_upcalls(s->sk);
157 siw_sk_assign_cm_upcalls(s->sk);
158 }
159
siw_cep_alloc(struct siw_device * sdev)160 static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
161 {
162 struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
163 unsigned long flags;
164
165 if (!cep)
166 return NULL;
167
168 INIT_LIST_HEAD(&cep->listenq);
169 INIT_LIST_HEAD(&cep->devq);
170 INIT_LIST_HEAD(&cep->work_freelist);
171
172 kref_init(&cep->ref);
173 cep->state = SIW_EPSTATE_IDLE;
174 init_waitqueue_head(&cep->waitq);
175 spin_lock_init(&cep->lock);
176 cep->sdev = sdev;
177 cep->enhanced_rdma_conn_est = false;
178
179 spin_lock_irqsave(&sdev->lock, flags);
180 list_add_tail(&cep->devq, &sdev->cep_list);
181 spin_unlock_irqrestore(&sdev->lock, flags);
182
183 siw_dbg_cep(cep, "new endpoint\n");
184 return cep;
185 }
186
siw_cm_free_work(struct siw_cep * cep)187 static void siw_cm_free_work(struct siw_cep *cep)
188 {
189 struct list_head *w, *tmp;
190 struct siw_cm_work *work;
191
192 list_for_each_safe(w, tmp, &cep->work_freelist) {
193 work = list_entry(w, struct siw_cm_work, list);
194 list_del(&work->list);
195 kfree(work);
196 }
197 }
198
siw_cancel_mpatimer(struct siw_cep * cep)199 static void siw_cancel_mpatimer(struct siw_cep *cep)
200 {
201 spin_lock_bh(&cep->lock);
202 if (cep->mpa_timer) {
203 if (cancel_delayed_work(&cep->mpa_timer->work)) {
204 siw_cep_put(cep);
205 kfree(cep->mpa_timer); /* not needed again */
206 }
207 cep->mpa_timer = NULL;
208 }
209 spin_unlock_bh(&cep->lock);
210 }
211
siw_put_work(struct siw_cm_work * work)212 static void siw_put_work(struct siw_cm_work *work)
213 {
214 INIT_LIST_HEAD(&work->list);
215 spin_lock_bh(&work->cep->lock);
216 list_add(&work->list, &work->cep->work_freelist);
217 spin_unlock_bh(&work->cep->lock);
218 }
219
siw_cep_set_inuse(struct siw_cep * cep)220 static void siw_cep_set_inuse(struct siw_cep *cep)
221 {
222 unsigned long flags;
223 retry:
224 spin_lock_irqsave(&cep->lock, flags);
225
226 if (cep->in_use) {
227 spin_unlock_irqrestore(&cep->lock, flags);
228 wait_event_interruptible(cep->waitq, !cep->in_use);
229 if (signal_pending(current))
230 flush_signals(current);
231 goto retry;
232 } else {
233 cep->in_use = 1;
234 spin_unlock_irqrestore(&cep->lock, flags);
235 }
236 }
237
siw_cep_set_free(struct siw_cep * cep)238 static void siw_cep_set_free(struct siw_cep *cep)
239 {
240 unsigned long flags;
241
242 spin_lock_irqsave(&cep->lock, flags);
243 cep->in_use = 0;
244 spin_unlock_irqrestore(&cep->lock, flags);
245
246 wake_up(&cep->waitq);
247 }
248
__siw_cep_dealloc(struct kref * ref)249 static void __siw_cep_dealloc(struct kref *ref)
250 {
251 struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
252 struct siw_device *sdev = cep->sdev;
253 unsigned long flags;
254
255 WARN_ON(cep->listen_cep);
256
257 /* kfree(NULL) is safe */
258 kfree(cep->mpa.pdata);
259 spin_lock_bh(&cep->lock);
260 if (!list_empty(&cep->work_freelist))
261 siw_cm_free_work(cep);
262 spin_unlock_bh(&cep->lock);
263
264 spin_lock_irqsave(&sdev->lock, flags);
265 list_del(&cep->devq);
266 spin_unlock_irqrestore(&sdev->lock, flags);
267
268 siw_dbg_cep(cep, "free endpoint\n");
269 kfree(cep);
270 }
271
siw_get_work(struct siw_cep * cep)272 static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
273 {
274 struct siw_cm_work *work = NULL;
275
276 spin_lock_bh(&cep->lock);
277 if (!list_empty(&cep->work_freelist)) {
278 work = list_entry(cep->work_freelist.next, struct siw_cm_work,
279 list);
280 list_del_init(&work->list);
281 }
282 spin_unlock_bh(&cep->lock);
283 return work;
284 }
285
siw_cm_alloc_work(struct siw_cep * cep,int num)286 static int siw_cm_alloc_work(struct siw_cep *cep, int num)
287 {
288 struct siw_cm_work *work;
289
290 while (num--) {
291 work = kmalloc(sizeof(*work), GFP_KERNEL);
292 if (!work) {
293 if (!(list_empty(&cep->work_freelist)))
294 siw_cm_free_work(cep);
295 return -ENOMEM;
296 }
297 work->cep = cep;
298 INIT_LIST_HEAD(&work->list);
299 list_add(&work->list, &cep->work_freelist);
300 }
301 return 0;
302 }
303
304 /*
305 * siw_cm_upcall()
306 *
307 * Upcall to IWCM to inform about async connection events
308 */
siw_cm_upcall(struct siw_cep * cep,enum iw_cm_event_type reason,int status)309 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
310 int status)
311 {
312 struct iw_cm_event event;
313 struct iw_cm_id *id;
314
315 memset(&event, 0, sizeof(event));
316 event.status = status;
317 event.event = reason;
318
319 if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
320 event.provider_data = cep;
321 id = cep->listen_cep->cm_id;
322 } else {
323 id = cep->cm_id;
324 }
325 /* Signal IRD and ORD */
326 if (reason == IW_CM_EVENT_ESTABLISHED ||
327 reason == IW_CM_EVENT_CONNECT_REPLY) {
328 /* Signal negotiated IRD/ORD values we will use */
329 event.ird = cep->ird;
330 event.ord = cep->ord;
331 } else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
332 event.ird = cep->ord;
333 event.ord = cep->ird;
334 }
335 /* Signal private data and address information */
336 if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
337 reason == IW_CM_EVENT_CONNECT_REPLY) {
338 u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
339
340 if (pd_len) {
341 /*
342 * hand over MPA private data
343 */
344 event.private_data_len = pd_len;
345 event.private_data = cep->mpa.pdata;
346
347 /* Hide MPA V2 IRD/ORD control */
348 if (cep->enhanced_rdma_conn_est) {
349 event.private_data_len -=
350 sizeof(struct mpa_v2_data);
351 event.private_data +=
352 sizeof(struct mpa_v2_data);
353 }
354 }
355 getname_local(cep->sock, &event.local_addr);
356 getname_peer(cep->sock, &event.remote_addr);
357 }
358 siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
359 cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
360
361 return id->event_handler(id, &event);
362 }
363
364 /*
365 * siw_qp_cm_drop()
366 *
367 * Drops established LLP connection if present and not already
368 * scheduled for dropping. Called from user context, SQ workqueue
369 * or receive IRQ. Caller signals if socket can be immediately
370 * closed (basically, if not in IRQ).
371 */
siw_qp_cm_drop(struct siw_qp * qp,int schedule)372 void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
373 {
374 struct siw_cep *cep = qp->cep;
375
376 qp->rx_stream.rx_suspend = 1;
377 qp->tx_ctx.tx_suspend = 1;
378
379 if (!qp->cep)
380 return;
381
382 if (schedule) {
383 siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
384 } else {
385 siw_cep_set_inuse(cep);
386
387 if (cep->state == SIW_EPSTATE_CLOSED) {
388 siw_dbg_cep(cep, "already closed\n");
389 goto out;
390 }
391 siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
392
393 if (qp->term_info.valid)
394 siw_send_terminate(qp);
395
396 if (cep->cm_id) {
397 switch (cep->state) {
398 case SIW_EPSTATE_AWAIT_MPAREP:
399 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
400 -EINVAL);
401 break;
402
403 case SIW_EPSTATE_RDMA_MODE:
404 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
405 break;
406
407 case SIW_EPSTATE_IDLE:
408 case SIW_EPSTATE_LISTENING:
409 case SIW_EPSTATE_CONNECTING:
410 case SIW_EPSTATE_AWAIT_MPAREQ:
411 case SIW_EPSTATE_RECVD_MPAREQ:
412 case SIW_EPSTATE_CLOSED:
413 default:
414 break;
415 }
416 cep->cm_id->rem_ref(cep->cm_id);
417 cep->cm_id = NULL;
418 siw_cep_put(cep);
419 }
420 cep->state = SIW_EPSTATE_CLOSED;
421
422 if (cep->sock) {
423 siw_socket_disassoc(cep->sock);
424 /*
425 * Immediately close socket
426 */
427 sock_release(cep->sock);
428 cep->sock = NULL;
429 }
430 if (cep->qp) {
431 cep->qp = NULL;
432 siw_qp_put(qp);
433 }
434 out:
435 siw_cep_set_free(cep);
436 }
437 }
438
siw_cep_put(struct siw_cep * cep)439 void siw_cep_put(struct siw_cep *cep)
440 {
441 WARN_ON(kref_read(&cep->ref) < 1);
442 kref_put(&cep->ref, __siw_cep_dealloc);
443 }
444
siw_cep_get(struct siw_cep * cep)445 void siw_cep_get(struct siw_cep *cep)
446 {
447 kref_get(&cep->ref);
448 }
449
450 /*
451 * Expects params->pd_len in host byte order
452 */
siw_send_mpareqrep(struct siw_cep * cep,const void * pdata,u8 pd_len)453 static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
454 {
455 struct socket *s = cep->sock;
456 struct mpa_rr *rr = &cep->mpa.hdr;
457 struct kvec iov[3];
458 struct msghdr msg;
459 int rv;
460 int iovec_num = 0;
461 int mpa_len;
462
463 memset(&msg, 0, sizeof(msg));
464
465 iov[iovec_num].iov_base = rr;
466 iov[iovec_num].iov_len = sizeof(*rr);
467 mpa_len = sizeof(*rr);
468
469 if (cep->enhanced_rdma_conn_est) {
470 iovec_num++;
471 iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
472 iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
473 mpa_len += sizeof(cep->mpa.v2_ctrl);
474 }
475 if (pd_len) {
476 iovec_num++;
477 iov[iovec_num].iov_base = (char *)pdata;
478 iov[iovec_num].iov_len = pd_len;
479 mpa_len += pd_len;
480 }
481 if (cep->enhanced_rdma_conn_est)
482 pd_len += sizeof(cep->mpa.v2_ctrl);
483
484 rr->params.pd_len = cpu_to_be16(pd_len);
485
486 rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
487
488 return rv < 0 ? rv : 0;
489 }
490
491 /*
492 * Receive MPA Request/Reply header.
493 *
494 * Returns 0 if complete MPA Request/Reply header including
495 * eventual private data was received. Returns -EAGAIN if
496 * header was partially received or negative error code otherwise.
497 *
498 * Context: May be called in process context only
499 */
siw_recv_mpa_rr(struct siw_cep * cep)500 static int siw_recv_mpa_rr(struct siw_cep *cep)
501 {
502 struct mpa_rr *hdr = &cep->mpa.hdr;
503 struct socket *s = cep->sock;
504 u16 pd_len;
505 int rcvd, to_rcv;
506
507 if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) {
508 rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd,
509 sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd,
510 0);
511 if (rcvd <= 0)
512 return -ECONNABORTED;
513
514 cep->mpa.bytes_rcvd += rcvd;
515
516 if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr))
517 return -EAGAIN;
518
519 if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA)
520 return -EPROTO;
521 }
522 pd_len = be16_to_cpu(hdr->params.pd_len);
523
524 /*
525 * At least the MPA Request/Reply header (frame not including
526 * private data) has been received.
527 * Receive (or continue receiving) any private data.
528 */
529 to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr));
530
531 if (!to_rcv) {
532 /*
533 * We must have hdr->params.pd_len == 0 and thus received a
534 * complete MPA Request/Reply frame.
535 * Check against peer protocol violation.
536 */
537 u32 word;
538
539 rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT);
540 if (rcvd == -EAGAIN)
541 return 0;
542
543 if (rcvd == 0) {
544 siw_dbg_cep(cep, "peer EOF\n");
545 return -EPIPE;
546 }
547 if (rcvd < 0) {
548 siw_dbg_cep(cep, "error: %d\n", rcvd);
549 return rcvd;
550 }
551 siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd);
552
553 return -EPROTO;
554 }
555
556 /*
557 * At this point, we must have hdr->params.pd_len != 0.
558 * A private data buffer gets allocated if hdr->params.pd_len != 0.
559 */
560 if (!cep->mpa.pdata) {
561 cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL);
562 if (!cep->mpa.pdata)
563 return -ENOMEM;
564 }
565 rcvd = ksock_recv(
566 s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr),
567 to_rcv + 4, MSG_DONTWAIT);
568
569 if (rcvd < 0)
570 return rcvd;
571
572 if (rcvd > to_rcv)
573 return -EPROTO;
574
575 cep->mpa.bytes_rcvd += rcvd;
576
577 if (to_rcv == rcvd) {
578 siw_dbg_cep(cep, "%d bytes private data received\n", pd_len);
579 return 0;
580 }
581 return -EAGAIN;
582 }
583
584 /*
585 * siw_proc_mpareq()
586 *
587 * Read MPA Request from socket and signal new connection to IWCM
588 * if success. Caller must hold lock on corresponding listening CEP.
589 */
siw_proc_mpareq(struct siw_cep * cep)590 static int siw_proc_mpareq(struct siw_cep *cep)
591 {
592 struct mpa_rr *req;
593 int version, rv;
594 u16 pd_len;
595
596 rv = siw_recv_mpa_rr(cep);
597 if (rv)
598 return rv;
599
600 req = &cep->mpa.hdr;
601
602 version = __mpa_rr_revision(req->params.bits);
603 pd_len = be16_to_cpu(req->params.pd_len);
604
605 if (version > MPA_REVISION_2)
606 /* allow for 0, 1, and 2 only */
607 return -EPROTO;
608
609 if (memcmp(req->key, MPA_KEY_REQ, 16))
610 return -EPROTO;
611
612 /* Prepare for sending MPA reply */
613 memcpy(req->key, MPA_KEY_REP, 16);
614
615 if (version == MPA_REVISION_2 &&
616 (req->params.bits & MPA_RR_FLAG_ENHANCED)) {
617 /*
618 * MPA version 2 must signal IRD/ORD values and P2P mode
619 * in private data if header flag MPA_RR_FLAG_ENHANCED
620 * is set.
621 */
622 if (pd_len < sizeof(struct mpa_v2_data))
623 goto reject_conn;
624
625 cep->enhanced_rdma_conn_est = true;
626 }
627
628 /* MPA Markers: currently not supported. Marker TX to be added. */
629 if (req->params.bits & MPA_RR_FLAG_MARKERS)
630 goto reject_conn;
631
632 if (req->params.bits & MPA_RR_FLAG_CRC) {
633 /*
634 * RFC 5044, page 27: CRC MUST be used if peer requests it.
635 * siw specific: 'mpa_crc_strict' parameter to reject
636 * connection with CRC if local CRC off enforced by
637 * 'mpa_crc_strict' module parameter.
638 */
639 if (!mpa_crc_required && mpa_crc_strict)
640 goto reject_conn;
641
642 /* Enable CRC if requested by module parameter */
643 if (mpa_crc_required)
644 req->params.bits |= MPA_RR_FLAG_CRC;
645 }
646 if (cep->enhanced_rdma_conn_est) {
647 struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata;
648
649 /*
650 * Peer requested ORD becomes requested local IRD,
651 * peer requested IRD becomes requested local ORD.
652 * IRD and ORD get limited by global maximum values.
653 */
654 cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
655 cep->ord = min(cep->ord, SIW_MAX_ORD_QP);
656 cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
657 cep->ird = min(cep->ird, SIW_MAX_IRD_QP);
658
659 /* May get overwritten by locally negotiated values */
660 cep->mpa.v2_ctrl.ird = htons(cep->ird);
661 cep->mpa.v2_ctrl.ord = htons(cep->ord);
662
663 /*
664 * Support for peer sent zero length Write or Read to
665 * let local side enter RTS. Writes are preferred.
666 * Sends would require pre-posting a Receive and are
667 * not supported.
668 * Propose zero length Write if none of Read and Write
669 * is indicated.
670 */
671 if (v2->ird & MPA_V2_PEER_TO_PEER) {
672 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
673
674 if (v2->ord & MPA_V2_RDMA_WRITE_RTR)
675 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
676 else if (v2->ord & MPA_V2_RDMA_READ_RTR)
677 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR;
678 else
679 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
680 }
681 }
682
683 cep->state = SIW_EPSTATE_RECVD_MPAREQ;
684
685 /* Keep reference until IWCM accepts/rejects */
686 siw_cep_get(cep);
687 rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0);
688 if (rv)
689 siw_cep_put(cep);
690
691 return rv;
692
693 reject_conn:
694 siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n",
695 req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
696 mpa_crc_required, mpa_crc_strict,
697 req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
698
699 req->params.bits &= ~MPA_RR_FLAG_MARKERS;
700 req->params.bits |= MPA_RR_FLAG_REJECT;
701
702 if (!mpa_crc_required && mpa_crc_strict)
703 req->params.bits &= ~MPA_RR_FLAG_CRC;
704
705 if (pd_len)
706 kfree(cep->mpa.pdata);
707
708 cep->mpa.pdata = NULL;
709
710 siw_send_mpareqrep(cep, NULL, 0);
711
712 return -EOPNOTSUPP;
713 }
714
siw_proc_mpareply(struct siw_cep * cep)715 static int siw_proc_mpareply(struct siw_cep *cep)
716 {
717 struct siw_qp_attrs qp_attrs;
718 enum siw_qp_attr_mask qp_attr_mask;
719 struct siw_qp *qp = cep->qp;
720 struct mpa_rr *rep;
721 int rv;
722 u16 rep_ord;
723 u16 rep_ird;
724 bool ird_insufficient = false;
725 enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR;
726
727 rv = siw_recv_mpa_rr(cep);
728 if (rv)
729 goto out_err;
730
731 siw_cancel_mpatimer(cep);
732
733 rep = &cep->mpa.hdr;
734
735 if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) {
736 /* allow for 0, 1, and 2 only */
737 rv = -EPROTO;
738 goto out_err;
739 }
740 if (memcmp(rep->key, MPA_KEY_REP, 16)) {
741 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA,
742 LLP_ECODE_INVALID_REQ_RESP, 0);
743 siw_send_terminate(qp);
744 rv = -EPROTO;
745 goto out_err;
746 }
747 if (rep->params.bits & MPA_RR_FLAG_REJECT) {
748 siw_dbg_cep(cep, "got mpa reject\n");
749 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET);
750
751 return -ECONNRESET;
752 }
753 if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) {
754 siw_dbg_cep(cep, "peer allows GSO on TX\n");
755 qp->tx_ctx.gso_seg_limit = 0;
756 }
757 if ((rep->params.bits & MPA_RR_FLAG_MARKERS) ||
758 (mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) ||
759 (mpa_crc_strict && !mpa_crc_required &&
760 (rep->params.bits & MPA_RR_FLAG_CRC))) {
761 siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n",
762 rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
763 mpa_crc_required, mpa_crc_strict,
764 rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
765
766 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED);
767
768 return -EINVAL;
769 }
770 if (cep->enhanced_rdma_conn_est) {
771 struct mpa_v2_data *v2;
772
773 if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 ||
774 !(rep->params.bits & MPA_RR_FLAG_ENHANCED)) {
775 /*
776 * Protocol failure: The responder MUST reply with
777 * MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED.
778 */
779 siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n",
780 __mpa_rr_revision(rep->params.bits),
781 rep->params.bits & MPA_RR_FLAG_ENHANCED ?
782 1 :
783 0);
784
785 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
786 -ECONNRESET);
787 return -EINVAL;
788 }
789 v2 = (struct mpa_v2_data *)cep->mpa.pdata;
790 rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
791 rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
792
793 if (cep->ird < rep_ord &&
794 (relaxed_ird_negotiation == false ||
795 rep_ord > cep->sdev->attrs.max_ird)) {
796 siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n",
797 cep->ird, rep_ord,
798 cep->sdev->attrs.max_ord);
799 ird_insufficient = true;
800 }
801 if (cep->ord > rep_ird && relaxed_ird_negotiation == false) {
802 siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord,
803 rep_ird);
804 ird_insufficient = true;
805 }
806 /*
807 * Always report negotiated peer values to user,
808 * even if IRD/ORD negotiation failed
809 */
810 cep->ird = rep_ord;
811 cep->ord = rep_ird;
812
813 if (ird_insufficient) {
814 /*
815 * If the initiator IRD is insuffient for the
816 * responder ORD, send a TERM.
817 */
818 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
819 LLP_ETYPE_MPA,
820 LLP_ECODE_INSUFFICIENT_IRD, 0);
821 siw_send_terminate(qp);
822 rv = -ENOMEM;
823 goto out_err;
824 }
825 if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER)
826 mpa_p2p_mode =
827 cep->mpa.v2_ctrl_req.ord &
828 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR);
829
830 /*
831 * Check if we requested P2P mode, and if peer agrees
832 */
833 if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
834 if ((mpa_p2p_mode & v2->ord) == 0) {
835 /*
836 * We requested RTR mode(s), but the peer
837 * did not pick any mode we support.
838 */
839 siw_dbg_cep(cep,
840 "rtr mode: req %2x, got %2x\n",
841 mpa_p2p_mode,
842 v2->ord & (MPA_V2_RDMA_WRITE_RTR |
843 MPA_V2_RDMA_READ_RTR));
844
845 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
846 LLP_ETYPE_MPA,
847 LLP_ECODE_NO_MATCHING_RTR,
848 0);
849 siw_send_terminate(qp);
850 rv = -EPROTO;
851 goto out_err;
852 }
853 mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR |
854 MPA_V2_RDMA_READ_RTR);
855 }
856 }
857 memset(&qp_attrs, 0, sizeof(qp_attrs));
858
859 if (rep->params.bits & MPA_RR_FLAG_CRC)
860 qp_attrs.flags = SIW_MPA_CRC;
861
862 qp_attrs.irq_size = cep->ird;
863 qp_attrs.orq_size = cep->ord;
864 qp_attrs.sk = cep->sock;
865 qp_attrs.state = SIW_QP_STATE_RTS;
866
867 qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
868 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA;
869
870 /* Move socket RX/TX under QP control */
871 down_write(&qp->state_lock);
872 if (qp->attrs.state > SIW_QP_STATE_RTR) {
873 rv = -EINVAL;
874 up_write(&qp->state_lock);
875 goto out_err;
876 }
877 rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask);
878
879 siw_qp_socket_assoc(cep, qp);
880
881 up_write(&qp->state_lock);
882
883 /* Send extra RDMA frame to trigger peer RTS if negotiated */
884 if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
885 rv = siw_qp_mpa_rts(qp, mpa_p2p_mode);
886 if (rv)
887 goto out_err;
888 }
889 if (!rv) {
890 rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0);
891 if (!rv)
892 cep->state = SIW_EPSTATE_RDMA_MODE;
893
894 return 0;
895 }
896
897 out_err:
898 if (rv != -EAGAIN)
899 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL);
900
901 return rv;
902 }
903
904 /*
905 * siw_accept_newconn - accept an incoming pending connection
906 *
907 */
siw_accept_newconn(struct siw_cep * cep)908 static void siw_accept_newconn(struct siw_cep *cep)
909 {
910 struct socket *s = cep->sock;
911 struct socket *new_s = NULL;
912 struct siw_cep *new_cep = NULL;
913 int rv = 0; /* debug only. should disappear */
914
915 if (cep->state != SIW_EPSTATE_LISTENING)
916 goto error;
917
918 new_cep = siw_cep_alloc(cep->sdev);
919 if (!new_cep)
920 goto error;
921
922 /*
923 * 4: Allocate a sufficient number of work elements
924 * to allow concurrent handling of local + peer close
925 * events, MPA header processing + MPA timeout.
926 */
927 if (siw_cm_alloc_work(new_cep, 4) != 0)
928 goto error;
929
930 /*
931 * Copy saved socket callbacks from listening CEP
932 * and assign new socket with new CEP
933 */
934 new_cep->sk_state_change = cep->sk_state_change;
935 new_cep->sk_data_ready = cep->sk_data_ready;
936 new_cep->sk_write_space = cep->sk_write_space;
937 new_cep->sk_error_report = cep->sk_error_report;
938
939 rv = kernel_accept(s, &new_s, O_NONBLOCK);
940 if (rv != 0) {
941 /*
942 * Connection already aborted by peer..?
943 */
944 siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv);
945 goto error;
946 }
947 new_cep->sock = new_s;
948 siw_cep_get(new_cep);
949 new_s->sk->sk_user_data = new_cep;
950
951 if (siw_tcp_nagle == false)
952 tcp_sock_set_nodelay(new_s->sk);
953 new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
954
955 rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT);
956 if (rv)
957 goto error;
958 /*
959 * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep.
960 */
961 new_cep->listen_cep = cep;
962 siw_cep_get(cep);
963
964 if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
965 /*
966 * MPA REQ already queued
967 */
968 siw_dbg_cep(cep, "immediate mpa request\n");
969
970 siw_cep_set_inuse(new_cep);
971 rv = siw_proc_mpareq(new_cep);
972 if (rv != -EAGAIN) {
973 siw_cep_put(cep);
974 new_cep->listen_cep = NULL;
975 if (rv) {
976 siw_cancel_mpatimer(new_cep);
977 siw_cep_set_free(new_cep);
978 goto error;
979 }
980 }
981 siw_cep_set_free(new_cep);
982 }
983 return;
984
985 error:
986 if (new_cep)
987 siw_cep_put(new_cep);
988
989 if (new_s) {
990 siw_socket_disassoc(new_s);
991 sock_release(new_s);
992 new_cep->sock = NULL;
993 }
994 siw_dbg_cep(cep, "error %d\n", rv);
995 }
996
siw_cm_work_handler(struct work_struct * w)997 static void siw_cm_work_handler(struct work_struct *w)
998 {
999 struct siw_cm_work *work;
1000 struct siw_cep *cep;
1001 int release_cep = 0, rv = 0;
1002
1003 work = container_of(w, struct siw_cm_work, work.work);
1004 cep = work->cep;
1005
1006 siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
1007 cep->qp ? qp_id(cep->qp) : UINT_MAX,
1008 work->type, cep->state);
1009
1010 siw_cep_set_inuse(cep);
1011
1012 switch (work->type) {
1013 case SIW_CM_WORK_ACCEPT:
1014 siw_accept_newconn(cep);
1015 break;
1016
1017 case SIW_CM_WORK_READ_MPAHDR:
1018 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1019 if (cep->listen_cep) {
1020 siw_cep_set_inuse(cep->listen_cep);
1021
1022 if (cep->listen_cep->state ==
1023 SIW_EPSTATE_LISTENING)
1024 rv = siw_proc_mpareq(cep);
1025 else
1026 rv = -EFAULT;
1027
1028 siw_cep_set_free(cep->listen_cep);
1029
1030 if (rv != -EAGAIN) {
1031 siw_cep_put(cep->listen_cep);
1032 cep->listen_cep = NULL;
1033 if (rv)
1034 siw_cep_put(cep);
1035 }
1036 }
1037 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1038 rv = siw_proc_mpareply(cep);
1039 } else {
1040 /*
1041 * CEP already moved out of MPA handshake.
1042 * any connection management already done.
1043 * silently ignore the mpa packet.
1044 */
1045 if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1046 cep->sock->sk->sk_data_ready(cep->sock->sk);
1047 siw_dbg_cep(cep, "already in RDMA mode");
1048 } else {
1049 siw_dbg_cep(cep, "out of state: %d\n",
1050 cep->state);
1051 }
1052 }
1053 if (rv && rv != EAGAIN)
1054 release_cep = 1;
1055 break;
1056
1057 case SIW_CM_WORK_CLOSE_LLP:
1058 /*
1059 * QP scheduled LLP close
1060 */
1061 if (cep->qp && cep->qp->term_info.valid)
1062 siw_send_terminate(cep->qp);
1063
1064 if (cep->cm_id)
1065 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1066
1067 release_cep = 1;
1068 break;
1069
1070 case SIW_CM_WORK_PEER_CLOSE:
1071 if (cep->cm_id) {
1072 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1073 /*
1074 * MPA reply not received, but connection drop
1075 */
1076 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1077 -ECONNRESET);
1078 } else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1079 /*
1080 * NOTE: IW_CM_EVENT_DISCONNECT is given just
1081 * to transition IWCM into CLOSING.
1082 */
1083 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
1084 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1085 }
1086 /*
1087 * for other states there is no connection
1088 * known to the IWCM.
1089 */
1090 } else {
1091 if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
1092 /*
1093 * Wait for the ulp/CM to call accept/reject
1094 */
1095 siw_dbg_cep(cep,
1096 "mpa req recvd, wait for ULP\n");
1097 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1098 /*
1099 * Socket close before MPA request received.
1100 */
1101 if (cep->listen_cep) {
1102 siw_dbg_cep(cep,
1103 "no mpareq: drop listener\n");
1104 siw_cep_put(cep->listen_cep);
1105 cep->listen_cep = NULL;
1106 }
1107 }
1108 }
1109 release_cep = 1;
1110 break;
1111
1112 case SIW_CM_WORK_MPATIMEOUT:
1113 cep->mpa_timer = NULL;
1114
1115 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1116 /*
1117 * MPA request timed out:
1118 * Hide any partially received private data and signal
1119 * timeout
1120 */
1121 cep->mpa.hdr.params.pd_len = 0;
1122
1123 if (cep->cm_id)
1124 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1125 -ETIMEDOUT);
1126 release_cep = 1;
1127
1128 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1129 /*
1130 * No MPA request received after peer TCP stream setup.
1131 */
1132 if (cep->listen_cep) {
1133 siw_cep_put(cep->listen_cep);
1134 cep->listen_cep = NULL;
1135 }
1136 release_cep = 1;
1137 }
1138 break;
1139
1140 default:
1141 WARN(1, "Undefined CM work type: %d\n", work->type);
1142 }
1143 if (release_cep) {
1144 siw_dbg_cep(cep,
1145 "release: timer=%s, QP[%u]\n",
1146 cep->mpa_timer ? "y" : "n",
1147 cep->qp ? qp_id(cep->qp) : UINT_MAX);
1148
1149 siw_cancel_mpatimer(cep);
1150
1151 cep->state = SIW_EPSTATE_CLOSED;
1152
1153 if (cep->qp) {
1154 struct siw_qp *qp = cep->qp;
1155 /*
1156 * Serialize a potential race with application
1157 * closing the QP and calling siw_qp_cm_drop()
1158 */
1159 siw_qp_get(qp);
1160 siw_cep_set_free(cep);
1161
1162 siw_qp_llp_close(qp);
1163 siw_qp_put(qp);
1164
1165 siw_cep_set_inuse(cep);
1166 cep->qp = NULL;
1167 siw_qp_put(qp);
1168 }
1169 if (cep->sock) {
1170 siw_socket_disassoc(cep->sock);
1171 sock_release(cep->sock);
1172 cep->sock = NULL;
1173 }
1174 if (cep->cm_id) {
1175 cep->cm_id->rem_ref(cep->cm_id);
1176 cep->cm_id = NULL;
1177 siw_cep_put(cep);
1178 }
1179 }
1180 siw_cep_set_free(cep);
1181 siw_put_work(work);
1182 siw_cep_put(cep);
1183 }
1184
1185 static struct workqueue_struct *siw_cm_wq;
1186
siw_cm_queue_work(struct siw_cep * cep,enum siw_work_type type)1187 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
1188 {
1189 struct siw_cm_work *work = siw_get_work(cep);
1190 unsigned long delay = 0;
1191
1192 if (!work) {
1193 siw_dbg_cep(cep, "failed with no work available\n");
1194 return -ENOMEM;
1195 }
1196 work->type = type;
1197 work->cep = cep;
1198
1199 siw_cep_get(cep);
1200
1201 INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
1202
1203 if (type == SIW_CM_WORK_MPATIMEOUT) {
1204 cep->mpa_timer = work;
1205
1206 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
1207 delay = MPAREQ_TIMEOUT;
1208 else
1209 delay = MPAREP_TIMEOUT;
1210 }
1211 siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
1212 cep->qp ? qp_id(cep->qp) : -1, type, delay);
1213
1214 queue_delayed_work(siw_cm_wq, &work->work, delay);
1215
1216 return 0;
1217 }
1218
siw_cm_llp_data_ready(struct sock * sk)1219 static void siw_cm_llp_data_ready(struct sock *sk)
1220 {
1221 struct siw_cep *cep;
1222
1223 read_lock(&sk->sk_callback_lock);
1224
1225 cep = sk_to_cep(sk);
1226 if (!cep)
1227 goto out;
1228
1229 siw_dbg_cep(cep, "cep state: %d, socket state %d\n",
1230 cep->state, sk->sk_state);
1231
1232 if (sk->sk_state != TCP_ESTABLISHED)
1233 goto out;
1234
1235 switch (cep->state) {
1236 case SIW_EPSTATE_RDMA_MODE:
1237 case SIW_EPSTATE_LISTENING:
1238 break;
1239
1240 case SIW_EPSTATE_AWAIT_MPAREQ:
1241 case SIW_EPSTATE_AWAIT_MPAREP:
1242 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
1243 break;
1244
1245 default:
1246 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
1247 break;
1248 }
1249 out:
1250 read_unlock(&sk->sk_callback_lock);
1251 }
1252
siw_cm_llp_write_space(struct sock * sk)1253 static void siw_cm_llp_write_space(struct sock *sk)
1254 {
1255 struct siw_cep *cep = sk_to_cep(sk);
1256
1257 if (cep)
1258 siw_dbg_cep(cep, "state: %d\n", cep->state);
1259 }
1260
siw_cm_llp_error_report(struct sock * sk)1261 static void siw_cm_llp_error_report(struct sock *sk)
1262 {
1263 struct siw_cep *cep = sk_to_cep(sk);
1264
1265 if (cep) {
1266 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
1267 sk->sk_err, sk->sk_state, cep->state);
1268 cep->sk_error_report(sk);
1269 }
1270 }
1271
siw_cm_llp_state_change(struct sock * sk)1272 static void siw_cm_llp_state_change(struct sock *sk)
1273 {
1274 struct siw_cep *cep;
1275 void (*orig_state_change)(struct sock *s);
1276
1277 read_lock(&sk->sk_callback_lock);
1278
1279 cep = sk_to_cep(sk);
1280 if (!cep) {
1281 /* endpoint already disassociated */
1282 read_unlock(&sk->sk_callback_lock);
1283 return;
1284 }
1285 orig_state_change = cep->sk_state_change;
1286
1287 siw_dbg_cep(cep, "state: %d\n", cep->state);
1288
1289 switch (sk->sk_state) {
1290 case TCP_ESTABLISHED:
1291 /*
1292 * handle accepting socket as special case where only
1293 * new connection is possible
1294 */
1295 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
1296 break;
1297
1298 case TCP_CLOSE:
1299 case TCP_CLOSE_WAIT:
1300 if (cep->qp)
1301 cep->qp->tx_ctx.tx_suspend = 1;
1302 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
1303 break;
1304
1305 default:
1306 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
1307 }
1308 read_unlock(&sk->sk_callback_lock);
1309 orig_state_change(sk);
1310 }
1311
kernel_bindconnect(struct socket * s,struct sockaddr * laddr,struct sockaddr * raddr)1312 static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
1313 struct sockaddr *raddr)
1314 {
1315 int rv, flags = 0;
1316 size_t size = laddr->sa_family == AF_INET ?
1317 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
1318
1319 /*
1320 * Make address available again asap.
1321 */
1322 sock_set_reuseaddr(s->sk);
1323
1324 rv = s->ops->bind(s, laddr, size);
1325 if (rv < 0)
1326 return rv;
1327
1328 rv = s->ops->connect(s, raddr, size, flags);
1329
1330 return rv < 0 ? rv : 0;
1331 }
1332
siw_connect(struct iw_cm_id * id,struct iw_cm_conn_param * params)1333 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1334 {
1335 struct siw_device *sdev = to_siw_dev(id->device);
1336 struct siw_qp *qp;
1337 struct siw_cep *cep = NULL;
1338 struct socket *s = NULL;
1339 struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
1340 *raddr = (struct sockaddr *)&id->remote_addr;
1341 bool p2p_mode = peer_to_peer, v4 = true;
1342 u16 pd_len = params->private_data_len;
1343 int version = mpa_version, rv;
1344
1345 if (pd_len > MPA_MAX_PRIVDATA)
1346 return -EINVAL;
1347
1348 if (params->ird > sdev->attrs.max_ird ||
1349 params->ord > sdev->attrs.max_ord)
1350 return -ENOMEM;
1351
1352 if (laddr->sa_family == AF_INET6)
1353 v4 = false;
1354 else if (laddr->sa_family != AF_INET)
1355 return -EAFNOSUPPORT;
1356
1357 /*
1358 * Respect any iwarp port mapping: Use mapped remote address
1359 * if valid. Local address must not be mapped, since siw
1360 * uses kernel TCP stack.
1361 */
1362 if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
1363 to_sockaddr_in6(id->remote_addr).sin6_port != 0)
1364 raddr = (struct sockaddr *)&id->m_remote_addr;
1365
1366 qp = siw_qp_id2obj(sdev, params->qpn);
1367 if (!qp) {
1368 WARN(1, "[QP %u] does not exist\n", params->qpn);
1369 rv = -EINVAL;
1370 goto error;
1371 }
1372 siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr,
1373 raddr);
1374
1375 rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
1376 if (rv < 0)
1377 goto error;
1378
1379 /*
1380 * NOTE: For simplification, connect() is called in blocking
1381 * mode. Might be reconsidered for async connection setup at
1382 * TCP level.
1383 */
1384 rv = kernel_bindconnect(s, laddr, raddr);
1385 if (rv != 0) {
1386 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
1387 goto error;
1388 }
1389 if (siw_tcp_nagle == false)
1390 tcp_sock_set_nodelay(s->sk);
1391 cep = siw_cep_alloc(sdev);
1392 if (!cep) {
1393 rv = -ENOMEM;
1394 goto error;
1395 }
1396 siw_cep_set_inuse(cep);
1397
1398 /* Associate QP with CEP */
1399 siw_cep_get(cep);
1400 qp->cep = cep;
1401
1402 /* siw_qp_get(qp) already done by QP lookup */
1403 cep->qp = qp;
1404
1405 id->add_ref(id);
1406 cep->cm_id = id;
1407
1408 /*
1409 * 4: Allocate a sufficient number of work elements
1410 * to allow concurrent handling of local + peer close
1411 * events, MPA header processing + MPA timeout.
1412 */
1413 rv = siw_cm_alloc_work(cep, 4);
1414 if (rv != 0) {
1415 rv = -ENOMEM;
1416 goto error;
1417 }
1418 cep->ird = params->ird;
1419 cep->ord = params->ord;
1420
1421 if (p2p_mode && cep->ord == 0)
1422 cep->ord = 1;
1423
1424 cep->state = SIW_EPSTATE_CONNECTING;
1425
1426 /*
1427 * Associate CEP with socket
1428 */
1429 siw_cep_socket_assoc(cep, s);
1430
1431 cep->state = SIW_EPSTATE_AWAIT_MPAREP;
1432
1433 /*
1434 * Set MPA Request bits: CRC if required, no MPA Markers,
1435 * MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
1436 */
1437 cep->mpa.hdr.params.bits = 0;
1438 if (version > MPA_REVISION_2) {
1439 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
1440 version = MPA_REVISION_2;
1441 /* Adjust also module parameter */
1442 mpa_version = MPA_REVISION_2;
1443 }
1444 __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
1445
1446 if (try_gso)
1447 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
1448
1449 if (mpa_crc_required)
1450 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
1451
1452 /*
1453 * If MPA version == 2:
1454 * o Include ORD and IRD.
1455 * o Indicate peer-to-peer mode, if required by module
1456 * parameter 'peer_to_peer'.
1457 */
1458 if (version == MPA_REVISION_2) {
1459 cep->enhanced_rdma_conn_est = true;
1460 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
1461
1462 cep->mpa.v2_ctrl.ird = htons(cep->ird);
1463 cep->mpa.v2_ctrl.ord = htons(cep->ord);
1464
1465 if (p2p_mode) {
1466 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
1467 cep->mpa.v2_ctrl.ord |= rtr_type;
1468 }
1469 /* Remember own P2P mode requested */
1470 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
1471 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
1472 }
1473 memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
1474
1475 rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
1476 /*
1477 * Reset private data.
1478 */
1479 cep->mpa.hdr.params.pd_len = 0;
1480
1481 if (rv >= 0) {
1482 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
1483 if (!rv) {
1484 siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
1485 siw_cep_set_free(cep);
1486 return 0;
1487 }
1488 }
1489 error:
1490 siw_dbg(id->device, "failed: %d\n", rv);
1491
1492 if (cep) {
1493 siw_socket_disassoc(s);
1494 sock_release(s);
1495 cep->sock = NULL;
1496
1497 cep->qp = NULL;
1498
1499 cep->cm_id = NULL;
1500 id->rem_ref(id);
1501
1502 qp->cep = NULL;
1503 siw_cep_put(cep);
1504
1505 cep->state = SIW_EPSTATE_CLOSED;
1506
1507 siw_cep_set_free(cep);
1508
1509 siw_cep_put(cep);
1510
1511 } else if (s) {
1512 sock_release(s);
1513 }
1514 if (qp)
1515 siw_qp_put(qp);
1516
1517 return rv;
1518 }
1519
1520 /*
1521 * siw_accept - Let SoftiWARP accept an RDMA connection request
1522 *
1523 * @id: New connection management id to be used for accepted
1524 * connection request
1525 * @params: Connection parameters provided by ULP for accepting connection
1526 *
1527 * Transition QP to RTS state, associate new CM id @id with accepted CEP
1528 * and get prepared for TCP input by installing socket callbacks.
1529 * Then send MPA Reply and generate the "connection established" event.
1530 * Socket callbacks must be installed before sending MPA Reply, because
1531 * the latter may cause a first RDMA message to arrive from the RDMA Initiator
1532 * side very quickly, at which time the socket callbacks must be ready.
1533 */
siw_accept(struct iw_cm_id * id,struct iw_cm_conn_param * params)1534 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1535 {
1536 struct siw_device *sdev = to_siw_dev(id->device);
1537 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1538 struct siw_qp *qp;
1539 struct siw_qp_attrs qp_attrs;
1540 int rv, max_priv_data = MPA_MAX_PRIVDATA;
1541 bool wait_for_peer_rts = false;
1542
1543 siw_cep_set_inuse(cep);
1544 siw_cep_put(cep);
1545
1546 /* Free lingering inbound private data */
1547 if (cep->mpa.hdr.params.pd_len) {
1548 cep->mpa.hdr.params.pd_len = 0;
1549 kfree(cep->mpa.pdata);
1550 cep->mpa.pdata = NULL;
1551 }
1552 siw_cancel_mpatimer(cep);
1553
1554 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1555 siw_dbg_cep(cep, "out of state\n");
1556
1557 siw_cep_set_free(cep);
1558 siw_cep_put(cep);
1559
1560 return -ECONNRESET;
1561 }
1562 qp = siw_qp_id2obj(sdev, params->qpn);
1563 if (!qp) {
1564 WARN(1, "[QP %d] does not exist\n", params->qpn);
1565 siw_cep_set_free(cep);
1566 siw_cep_put(cep);
1567
1568 return -EINVAL;
1569 }
1570 down_write(&qp->state_lock);
1571 if (qp->attrs.state > SIW_QP_STATE_RTR) {
1572 rv = -EINVAL;
1573 up_write(&qp->state_lock);
1574 goto error;
1575 }
1576 siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
1577
1578 if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
1579 siw_dbg_cep(cep, "peer allows GSO on TX\n");
1580 qp->tx_ctx.gso_seg_limit = 0;
1581 }
1582 if (params->ord > sdev->attrs.max_ord ||
1583 params->ird > sdev->attrs.max_ird) {
1584 siw_dbg_cep(
1585 cep,
1586 "[QP %u]: ord %d (max %d), ird %d (max %d)\n",
1587 qp_id(qp), params->ord, sdev->attrs.max_ord,
1588 params->ird, sdev->attrs.max_ird);
1589 rv = -EINVAL;
1590 up_write(&qp->state_lock);
1591 goto error;
1592 }
1593 if (cep->enhanced_rdma_conn_est)
1594 max_priv_data -= sizeof(struct mpa_v2_data);
1595
1596 if (params->private_data_len > max_priv_data) {
1597 siw_dbg_cep(
1598 cep,
1599 "[QP %u]: private data length: %d (max %d)\n",
1600 qp_id(qp), params->private_data_len, max_priv_data);
1601 rv = -EINVAL;
1602 up_write(&qp->state_lock);
1603 goto error;
1604 }
1605 if (cep->enhanced_rdma_conn_est) {
1606 if (params->ord > cep->ord) {
1607 if (relaxed_ird_negotiation) {
1608 params->ord = cep->ord;
1609 } else {
1610 cep->ird = params->ird;
1611 cep->ord = params->ord;
1612 rv = -EINVAL;
1613 up_write(&qp->state_lock);
1614 goto error;
1615 }
1616 }
1617 if (params->ird < cep->ird) {
1618 if (relaxed_ird_negotiation &&
1619 cep->ird <= sdev->attrs.max_ird)
1620 params->ird = cep->ird;
1621 else {
1622 rv = -ENOMEM;
1623 up_write(&qp->state_lock);
1624 goto error;
1625 }
1626 }
1627 if (cep->mpa.v2_ctrl.ord &
1628 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
1629 wait_for_peer_rts = true;
1630 /*
1631 * Signal back negotiated IRD and ORD values
1632 */
1633 cep->mpa.v2_ctrl.ord =
1634 htons(params->ord & MPA_IRD_ORD_MASK) |
1635 (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
1636 cep->mpa.v2_ctrl.ird =
1637 htons(params->ird & MPA_IRD_ORD_MASK) |
1638 (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
1639 }
1640 cep->ird = params->ird;
1641 cep->ord = params->ord;
1642
1643 cep->cm_id = id;
1644 id->add_ref(id);
1645
1646 memset(&qp_attrs, 0, sizeof(qp_attrs));
1647 qp_attrs.orq_size = cep->ord;
1648 qp_attrs.irq_size = cep->ird;
1649 qp_attrs.sk = cep->sock;
1650 if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
1651 qp_attrs.flags = SIW_MPA_CRC;
1652 qp_attrs.state = SIW_QP_STATE_RTS;
1653
1654 siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
1655
1656 /* Associate QP with CEP */
1657 siw_cep_get(cep);
1658 qp->cep = cep;
1659
1660 /* siw_qp_get(qp) already done by QP lookup */
1661 cep->qp = qp;
1662
1663 cep->state = SIW_EPSTATE_RDMA_MODE;
1664
1665 /* Move socket RX/TX under QP control */
1666 rv = siw_qp_modify(qp, &qp_attrs,
1667 SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
1668 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
1669 SIW_QP_ATTR_MPA);
1670 up_write(&qp->state_lock);
1671
1672 if (rv)
1673 goto error;
1674
1675 siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
1676 qp_id(qp), params->private_data_len);
1677
1678 rv = siw_send_mpareqrep(cep, params->private_data,
1679 params->private_data_len);
1680 if (rv != 0)
1681 goto error;
1682
1683 if (wait_for_peer_rts) {
1684 siw_sk_assign_rtr_upcalls(cep);
1685 } else {
1686 siw_qp_socket_assoc(cep, qp);
1687 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
1688 if (rv)
1689 goto error;
1690 }
1691 siw_cep_set_free(cep);
1692
1693 return 0;
1694 error:
1695 siw_socket_disassoc(cep->sock);
1696 sock_release(cep->sock);
1697 cep->sock = NULL;
1698
1699 cep->state = SIW_EPSTATE_CLOSED;
1700
1701 if (cep->cm_id) {
1702 cep->cm_id->rem_ref(id);
1703 cep->cm_id = NULL;
1704 }
1705 if (qp->cep) {
1706 siw_cep_put(cep);
1707 qp->cep = NULL;
1708 }
1709 cep->qp = NULL;
1710 siw_qp_put(qp);
1711
1712 siw_cep_set_free(cep);
1713 siw_cep_put(cep);
1714
1715 return rv;
1716 }
1717
1718 /*
1719 * siw_reject()
1720 *
1721 * Local connection reject case. Send private data back to peer,
1722 * close connection and dereference connection id.
1723 */
siw_reject(struct iw_cm_id * id,const void * pdata,u8 pd_len)1724 int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
1725 {
1726 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1727
1728 siw_cep_set_inuse(cep);
1729 siw_cep_put(cep);
1730
1731 siw_cancel_mpatimer(cep);
1732
1733 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1734 siw_dbg_cep(cep, "out of state\n");
1735
1736 siw_cep_set_free(cep);
1737 siw_cep_put(cep); /* put last reference */
1738
1739 return -ECONNRESET;
1740 }
1741 siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
1742 pd_len);
1743
1744 if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
1745 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
1746 siw_send_mpareqrep(cep, pdata, pd_len);
1747 }
1748 siw_socket_disassoc(cep->sock);
1749 sock_release(cep->sock);
1750 cep->sock = NULL;
1751
1752 cep->state = SIW_EPSTATE_CLOSED;
1753
1754 siw_cep_set_free(cep);
1755 siw_cep_put(cep);
1756
1757 return 0;
1758 }
1759
1760 /*
1761 * siw_create_listen - Create resources for a listener's IWCM ID @id
1762 *
1763 * Starts listen on the socket address id->local_addr.
1764 *
1765 */
siw_create_listen(struct iw_cm_id * id,int backlog)1766 int siw_create_listen(struct iw_cm_id *id, int backlog)
1767 {
1768 struct socket *s;
1769 struct siw_cep *cep = NULL;
1770 struct siw_device *sdev = to_siw_dev(id->device);
1771 int addr_family = id->local_addr.ss_family;
1772 int rv = 0;
1773
1774 if (addr_family != AF_INET && addr_family != AF_INET6)
1775 return -EAFNOSUPPORT;
1776
1777 rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
1778 if (rv < 0)
1779 return rv;
1780
1781 /*
1782 * Allow binding local port when still in TIME_WAIT from last close.
1783 */
1784 sock_set_reuseaddr(s->sk);
1785
1786 if (addr_family == AF_INET) {
1787 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
1788
1789 /* For wildcard addr, limit binding to current device only */
1790 if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
1791 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1792
1793 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1794 sizeof(struct sockaddr_in));
1795 } else {
1796 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
1797
1798 /* For wildcard addr, limit binding to current device only */
1799 if (ipv6_addr_any(&laddr->sin6_addr))
1800 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1801
1802 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1803 sizeof(struct sockaddr_in6));
1804 }
1805 if (rv) {
1806 siw_dbg(id->device, "socket bind error: %d\n", rv);
1807 goto error;
1808 }
1809 cep = siw_cep_alloc(sdev);
1810 if (!cep) {
1811 rv = -ENOMEM;
1812 goto error;
1813 }
1814 siw_cep_socket_assoc(cep, s);
1815
1816 rv = siw_cm_alloc_work(cep, backlog);
1817 if (rv) {
1818 siw_dbg(id->device,
1819 "alloc_work error %d, backlog %d\n",
1820 rv, backlog);
1821 goto error;
1822 }
1823 rv = s->ops->listen(s, backlog);
1824 if (rv) {
1825 siw_dbg(id->device, "listen error %d\n", rv);
1826 goto error;
1827 }
1828 cep->cm_id = id;
1829 id->add_ref(id);
1830
1831 /*
1832 * In case of a wildcard rdma_listen on a multi-homed device,
1833 * a listener's IWCM id is associated with more than one listening CEP.
1834 *
1835 * We currently use id->provider_data in three different ways:
1836 *
1837 * o For a listener's IWCM id, id->provider_data points to
1838 * the list_head of the list of listening CEPs.
1839 * Uses: siw_create_listen(), siw_destroy_listen()
1840 *
1841 * o For each accepted passive-side IWCM id, id->provider_data
1842 * points to the CEP itself. This is a consequence of
1843 * - siw_cm_upcall() setting event.provider_data = cep and
1844 * - the IWCM's cm_conn_req_handler() setting provider_data of the
1845 * new passive-side IWCM id equal to event.provider_data
1846 * Uses: siw_accept(), siw_reject()
1847 *
1848 * o For an active-side IWCM id, id->provider_data is not used at all.
1849 *
1850 */
1851 if (!id->provider_data) {
1852 id->provider_data =
1853 kmalloc(sizeof(struct list_head), GFP_KERNEL);
1854 if (!id->provider_data) {
1855 rv = -ENOMEM;
1856 goto error;
1857 }
1858 INIT_LIST_HEAD((struct list_head *)id->provider_data);
1859 }
1860 list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
1861 cep->state = SIW_EPSTATE_LISTENING;
1862
1863 siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
1864
1865 return 0;
1866
1867 error:
1868 siw_dbg(id->device, "failed: %d\n", rv);
1869
1870 if (cep) {
1871 siw_cep_set_inuse(cep);
1872
1873 if (cep->cm_id) {
1874 cep->cm_id->rem_ref(cep->cm_id);
1875 cep->cm_id = NULL;
1876 }
1877 cep->sock = NULL;
1878 siw_socket_disassoc(s);
1879 cep->state = SIW_EPSTATE_CLOSED;
1880
1881 siw_cep_set_free(cep);
1882 siw_cep_put(cep);
1883 }
1884 sock_release(s);
1885
1886 return rv;
1887 }
1888
siw_drop_listeners(struct iw_cm_id * id)1889 static void siw_drop_listeners(struct iw_cm_id *id)
1890 {
1891 struct list_head *p, *tmp;
1892
1893 /*
1894 * In case of a wildcard rdma_listen on a multi-homed device,
1895 * a listener's IWCM id is associated with more than one listening CEP.
1896 */
1897 list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
1898 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
1899
1900 list_del(p);
1901
1902 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
1903
1904 siw_cep_set_inuse(cep);
1905
1906 if (cep->cm_id) {
1907 cep->cm_id->rem_ref(cep->cm_id);
1908 cep->cm_id = NULL;
1909 }
1910 if (cep->sock) {
1911 siw_socket_disassoc(cep->sock);
1912 sock_release(cep->sock);
1913 cep->sock = NULL;
1914 }
1915 cep->state = SIW_EPSTATE_CLOSED;
1916 siw_cep_set_free(cep);
1917 siw_cep_put(cep);
1918 }
1919 }
1920
siw_destroy_listen(struct iw_cm_id * id)1921 int siw_destroy_listen(struct iw_cm_id *id)
1922 {
1923 if (!id->provider_data) {
1924 siw_dbg(id->device, "no cep(s)\n");
1925 return 0;
1926 }
1927 siw_drop_listeners(id);
1928 kfree(id->provider_data);
1929 id->provider_data = NULL;
1930
1931 return 0;
1932 }
1933
siw_cm_init(void)1934 int siw_cm_init(void)
1935 {
1936 /*
1937 * create_single_workqueue for strict ordering
1938 */
1939 siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
1940 if (!siw_cm_wq)
1941 return -ENOMEM;
1942
1943 return 0;
1944 }
1945
siw_cm_exit(void)1946 void siw_cm_exit(void)
1947 {
1948 if (siw_cm_wq) {
1949 flush_workqueue(siw_cm_wq);
1950 destroy_workqueue(siw_cm_wq);
1951 }
1952 }
1953