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 #include <trace/events/sock.h>
20
21 #include <rdma/iw_cm.h>
22 #include <rdma/ib_verbs.h>
23 #include <rdma/ib_user_verbs.h>
24
25 #include "siw.h"
26 #include "siw_cm.h"
27
28 /*
29 * Set to any combination of
30 * MPA_V2_RDMA_NO_RTR, MPA_V2_RDMA_READ_RTR, MPA_V2_RDMA_WRITE_RTR
31 */
32 static __be16 rtr_type = MPA_V2_RDMA_READ_RTR | MPA_V2_RDMA_WRITE_RTR;
33 static const bool relaxed_ird_negotiation = true;
34
35 static void siw_cm_llp_state_change(struct sock *s);
36 static void siw_cm_llp_data_ready(struct sock *s);
37 static void siw_cm_llp_write_space(struct sock *s);
38 static void siw_cm_llp_error_report(struct sock *s);
39 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
40 int status);
41
siw_sk_assign_cm_upcalls(struct sock * sk)42 static void siw_sk_assign_cm_upcalls(struct sock *sk)
43 {
44 write_lock_bh(&sk->sk_callback_lock);
45 sk->sk_state_change = siw_cm_llp_state_change;
46 sk->sk_data_ready = siw_cm_llp_data_ready;
47 sk->sk_write_space = siw_cm_llp_write_space;
48 sk->sk_error_report = siw_cm_llp_error_report;
49 write_unlock_bh(&sk->sk_callback_lock);
50 }
51
siw_sk_save_upcalls(struct sock * sk)52 static void siw_sk_save_upcalls(struct sock *sk)
53 {
54 struct siw_cep *cep = sk_to_cep(sk);
55
56 write_lock_bh(&sk->sk_callback_lock);
57 cep->sk_state_change = sk->sk_state_change;
58 cep->sk_data_ready = sk->sk_data_ready;
59 cep->sk_write_space = sk->sk_write_space;
60 cep->sk_error_report = sk->sk_error_report;
61 write_unlock_bh(&sk->sk_callback_lock);
62 }
63
siw_sk_restore_upcalls(struct sock * sk,struct siw_cep * cep)64 static void siw_sk_restore_upcalls(struct sock *sk, struct siw_cep *cep)
65 {
66 sk->sk_state_change = cep->sk_state_change;
67 sk->sk_data_ready = cep->sk_data_ready;
68 sk->sk_write_space = cep->sk_write_space;
69 sk->sk_error_report = cep->sk_error_report;
70 sk->sk_user_data = NULL;
71 }
72
siw_qp_socket_assoc(struct siw_cep * cep,struct siw_qp * qp)73 static void siw_qp_socket_assoc(struct siw_cep *cep, struct siw_qp *qp)
74 {
75 struct socket *s = cep->sock;
76 struct sock *sk = s->sk;
77
78 write_lock_bh(&sk->sk_callback_lock);
79
80 qp->attrs.sk = s;
81 sk->sk_data_ready = siw_qp_llp_data_ready;
82 sk->sk_write_space = siw_qp_llp_write_space;
83
84 write_unlock_bh(&sk->sk_callback_lock);
85 }
86
siw_socket_disassoc(struct socket * s)87 static void siw_socket_disassoc(struct socket *s)
88 {
89 struct sock *sk = s->sk;
90 struct siw_cep *cep;
91
92 if (sk) {
93 write_lock_bh(&sk->sk_callback_lock);
94 cep = sk_to_cep(sk);
95 if (cep) {
96 siw_sk_restore_upcalls(sk, cep);
97 siw_cep_put(cep);
98 } else {
99 pr_warn("siw: cannot restore sk callbacks: no ep\n");
100 }
101 write_unlock_bh(&sk->sk_callback_lock);
102 } else {
103 pr_warn("siw: cannot restore sk callbacks: no sk\n");
104 }
105 }
106
siw_rtr_data_ready(struct sock * sk)107 static void siw_rtr_data_ready(struct sock *sk)
108 {
109 struct siw_cep *cep;
110 struct siw_qp *qp = NULL;
111 read_descriptor_t rd_desc;
112
113 trace_sk_data_ready(sk);
114
115 read_lock(&sk->sk_callback_lock);
116
117 cep = sk_to_cep(sk);
118 if (!cep) {
119 WARN(1, "No connection endpoint\n");
120 goto out;
121 }
122 qp = sk_to_qp(sk);
123
124 memset(&rd_desc, 0, sizeof(rd_desc));
125 rd_desc.arg.data = qp;
126 rd_desc.count = 1;
127
128 tcp_read_sock(sk, &rd_desc, siw_tcp_rx_data);
129 /*
130 * Check if first frame was successfully processed.
131 * Signal connection full establishment if yes.
132 * Failed data processing would have already scheduled
133 * connection drop.
134 */
135 if (!qp->rx_stream.rx_suspend)
136 siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
137 out:
138 read_unlock(&sk->sk_callback_lock);
139 if (qp)
140 siw_qp_socket_assoc(cep, qp);
141 }
142
siw_sk_assign_rtr_upcalls(struct siw_cep * cep)143 static void siw_sk_assign_rtr_upcalls(struct siw_cep *cep)
144 {
145 struct sock *sk = cep->sock->sk;
146
147 write_lock_bh(&sk->sk_callback_lock);
148 sk->sk_data_ready = siw_rtr_data_ready;
149 sk->sk_write_space = siw_qp_llp_write_space;
150 write_unlock_bh(&sk->sk_callback_lock);
151 }
152
siw_cep_socket_assoc(struct siw_cep * cep,struct socket * s)153 static void siw_cep_socket_assoc(struct siw_cep *cep, struct socket *s)
154 {
155 cep->sock = s;
156 siw_cep_get(cep);
157 s->sk->sk_user_data = cep;
158
159 siw_sk_save_upcalls(s->sk);
160 siw_sk_assign_cm_upcalls(s->sk);
161 }
162
siw_cep_alloc(struct siw_device * sdev)163 static struct siw_cep *siw_cep_alloc(struct siw_device *sdev)
164 {
165 struct siw_cep *cep = kzalloc(sizeof(*cep), GFP_KERNEL);
166 unsigned long flags;
167
168 if (!cep)
169 return NULL;
170
171 INIT_LIST_HEAD(&cep->listenq);
172 INIT_LIST_HEAD(&cep->devq);
173 INIT_LIST_HEAD(&cep->work_freelist);
174
175 kref_init(&cep->ref);
176 cep->state = SIW_EPSTATE_IDLE;
177 init_waitqueue_head(&cep->waitq);
178 spin_lock_init(&cep->lock);
179 cep->sdev = sdev;
180 cep->enhanced_rdma_conn_est = false;
181
182 spin_lock_irqsave(&sdev->lock, flags);
183 list_add_tail(&cep->devq, &sdev->cep_list);
184 spin_unlock_irqrestore(&sdev->lock, flags);
185
186 siw_dbg_cep(cep, "new endpoint\n");
187 return cep;
188 }
189
siw_cm_free_work(struct siw_cep * cep)190 static void siw_cm_free_work(struct siw_cep *cep)
191 {
192 struct list_head *w, *tmp;
193 struct siw_cm_work *work;
194
195 list_for_each_safe(w, tmp, &cep->work_freelist) {
196 work = list_entry(w, struct siw_cm_work, list);
197 list_del(&work->list);
198 kfree(work);
199 }
200 }
201
siw_cancel_mpatimer(struct siw_cep * cep)202 static void siw_cancel_mpatimer(struct siw_cep *cep)
203 {
204 spin_lock_bh(&cep->lock);
205 if (cep->mpa_timer) {
206 if (cancel_delayed_work(&cep->mpa_timer->work)) {
207 siw_cep_put(cep);
208 kfree(cep->mpa_timer); /* not needed again */
209 }
210 cep->mpa_timer = NULL;
211 }
212 spin_unlock_bh(&cep->lock);
213 }
214
siw_put_work(struct siw_cm_work * work)215 static void siw_put_work(struct siw_cm_work *work)
216 {
217 INIT_LIST_HEAD(&work->list);
218 spin_lock_bh(&work->cep->lock);
219 list_add(&work->list, &work->cep->work_freelist);
220 spin_unlock_bh(&work->cep->lock);
221 }
222
siw_cep_set_inuse(struct siw_cep * cep)223 static void siw_cep_set_inuse(struct siw_cep *cep)
224 {
225 unsigned long flags;
226 retry:
227 spin_lock_irqsave(&cep->lock, flags);
228
229 if (cep->in_use) {
230 spin_unlock_irqrestore(&cep->lock, flags);
231 wait_event_interruptible(cep->waitq, !cep->in_use);
232 if (signal_pending(current))
233 flush_signals(current);
234 goto retry;
235 } else {
236 cep->in_use = 1;
237 spin_unlock_irqrestore(&cep->lock, flags);
238 }
239 }
240
siw_cep_set_free(struct siw_cep * cep)241 static void siw_cep_set_free(struct siw_cep *cep)
242 {
243 unsigned long flags;
244
245 spin_lock_irqsave(&cep->lock, flags);
246 cep->in_use = 0;
247 spin_unlock_irqrestore(&cep->lock, flags);
248
249 wake_up(&cep->waitq);
250 }
251
__siw_cep_dealloc(struct kref * ref)252 static void __siw_cep_dealloc(struct kref *ref)
253 {
254 struct siw_cep *cep = container_of(ref, struct siw_cep, ref);
255 struct siw_device *sdev = cep->sdev;
256 unsigned long flags;
257
258 WARN_ON(cep->listen_cep);
259
260 /* kfree(NULL) is safe */
261 kfree(cep->mpa.pdata);
262 spin_lock_bh(&cep->lock);
263 if (!list_empty(&cep->work_freelist))
264 siw_cm_free_work(cep);
265 spin_unlock_bh(&cep->lock);
266
267 spin_lock_irqsave(&sdev->lock, flags);
268 list_del(&cep->devq);
269 spin_unlock_irqrestore(&sdev->lock, flags);
270
271 siw_dbg_cep(cep, "free endpoint\n");
272 kfree(cep);
273 }
274
siw_get_work(struct siw_cep * cep)275 static struct siw_cm_work *siw_get_work(struct siw_cep *cep)
276 {
277 struct siw_cm_work *work = NULL;
278
279 spin_lock_bh(&cep->lock);
280 if (!list_empty(&cep->work_freelist)) {
281 work = list_entry(cep->work_freelist.next, struct siw_cm_work,
282 list);
283 list_del_init(&work->list);
284 }
285 spin_unlock_bh(&cep->lock);
286 return work;
287 }
288
siw_cm_alloc_work(struct siw_cep * cep,int num)289 static int siw_cm_alloc_work(struct siw_cep *cep, int num)
290 {
291 struct siw_cm_work *work;
292
293 while (num--) {
294 work = kmalloc(sizeof(*work), GFP_KERNEL);
295 if (!work) {
296 if (!(list_empty(&cep->work_freelist)))
297 siw_cm_free_work(cep);
298 return -ENOMEM;
299 }
300 work->cep = cep;
301 INIT_LIST_HEAD(&work->list);
302 list_add(&work->list, &cep->work_freelist);
303 }
304 return 0;
305 }
306
307 /*
308 * siw_cm_upcall()
309 *
310 * Upcall to IWCM to inform about async connection events
311 */
siw_cm_upcall(struct siw_cep * cep,enum iw_cm_event_type reason,int status)312 static int siw_cm_upcall(struct siw_cep *cep, enum iw_cm_event_type reason,
313 int status)
314 {
315 struct iw_cm_event event;
316 struct iw_cm_id *id;
317
318 memset(&event, 0, sizeof(event));
319 event.status = status;
320 event.event = reason;
321
322 if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
323 event.provider_data = cep;
324 id = cep->listen_cep->cm_id;
325 } else {
326 id = cep->cm_id;
327 }
328 /* Signal IRD and ORD */
329 if (reason == IW_CM_EVENT_ESTABLISHED ||
330 reason == IW_CM_EVENT_CONNECT_REPLY) {
331 /* Signal negotiated IRD/ORD values we will use */
332 event.ird = cep->ird;
333 event.ord = cep->ord;
334 } else if (reason == IW_CM_EVENT_CONNECT_REQUEST) {
335 event.ird = cep->ord;
336 event.ord = cep->ird;
337 }
338 /* Signal private data and address information */
339 if (reason == IW_CM_EVENT_CONNECT_REQUEST ||
340 reason == IW_CM_EVENT_CONNECT_REPLY) {
341 u16 pd_len = be16_to_cpu(cep->mpa.hdr.params.pd_len);
342
343 if (pd_len) {
344 /*
345 * hand over MPA private data
346 */
347 event.private_data_len = pd_len;
348 event.private_data = cep->mpa.pdata;
349
350 /* Hide MPA V2 IRD/ORD control */
351 if (cep->enhanced_rdma_conn_est) {
352 event.private_data_len -=
353 sizeof(struct mpa_v2_data);
354 event.private_data +=
355 sizeof(struct mpa_v2_data);
356 }
357 }
358 getname_local(cep->sock, &event.local_addr);
359 getname_peer(cep->sock, &event.remote_addr);
360 }
361 siw_dbg_cep(cep, "[QP %u]: reason=%d, status=%d\n",
362 cep->qp ? qp_id(cep->qp) : UINT_MAX, reason, status);
363
364 return id->event_handler(id, &event);
365 }
366
367 /*
368 * siw_qp_cm_drop()
369 *
370 * Drops established LLP connection if present and not already
371 * scheduled for dropping. Called from user context, SQ workqueue
372 * or receive IRQ. Caller signals if socket can be immediately
373 * closed (basically, if not in IRQ).
374 */
siw_qp_cm_drop(struct siw_qp * qp,int schedule)375 void siw_qp_cm_drop(struct siw_qp *qp, int schedule)
376 {
377 struct siw_cep *cep = qp->cep;
378
379 qp->rx_stream.rx_suspend = 1;
380 qp->tx_ctx.tx_suspend = 1;
381
382 if (!qp->cep)
383 return;
384
385 if (schedule) {
386 siw_cm_queue_work(cep, SIW_CM_WORK_CLOSE_LLP);
387 } else {
388 siw_cep_set_inuse(cep);
389
390 if (cep->state == SIW_EPSTATE_CLOSED) {
391 siw_dbg_cep(cep, "already closed\n");
392 goto out;
393 }
394 siw_dbg_cep(cep, "immediate close, state %d\n", cep->state);
395
396 if (qp->term_info.valid)
397 siw_send_terminate(qp);
398
399 if (cep->cm_id) {
400 switch (cep->state) {
401 case SIW_EPSTATE_AWAIT_MPAREP:
402 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
403 -EINVAL);
404 break;
405
406 case SIW_EPSTATE_RDMA_MODE:
407 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
408 break;
409
410 case SIW_EPSTATE_IDLE:
411 case SIW_EPSTATE_LISTENING:
412 case SIW_EPSTATE_CONNECTING:
413 case SIW_EPSTATE_AWAIT_MPAREQ:
414 case SIW_EPSTATE_RECVD_MPAREQ:
415 case SIW_EPSTATE_CLOSED:
416 default:
417 break;
418 }
419 cep->cm_id->rem_ref(cep->cm_id);
420 cep->cm_id = NULL;
421 siw_cep_put(cep);
422 }
423 cep->state = SIW_EPSTATE_CLOSED;
424
425 if (cep->sock) {
426 siw_socket_disassoc(cep->sock);
427 /*
428 * Immediately close socket
429 */
430 sock_release(cep->sock);
431 cep->sock = NULL;
432 }
433 if (cep->qp) {
434 cep->qp = NULL;
435 siw_qp_put(qp);
436 }
437 out:
438 siw_cep_set_free(cep);
439 }
440 }
441
siw_cep_put(struct siw_cep * cep)442 void siw_cep_put(struct siw_cep *cep)
443 {
444 WARN_ON(kref_read(&cep->ref) < 1);
445 kref_put(&cep->ref, __siw_cep_dealloc);
446 }
447
siw_cep_get(struct siw_cep * cep)448 void siw_cep_get(struct siw_cep *cep)
449 {
450 kref_get(&cep->ref);
451 }
452
453 /*
454 * Expects params->pd_len in host byte order
455 */
siw_send_mpareqrep(struct siw_cep * cep,const void * pdata,u8 pd_len)456 static int siw_send_mpareqrep(struct siw_cep *cep, const void *pdata, u8 pd_len)
457 {
458 struct socket *s = cep->sock;
459 struct mpa_rr *rr = &cep->mpa.hdr;
460 struct kvec iov[3];
461 struct msghdr msg;
462 int rv;
463 int iovec_num = 0;
464 int mpa_len;
465
466 memset(&msg, 0, sizeof(msg));
467
468 iov[iovec_num].iov_base = rr;
469 iov[iovec_num].iov_len = sizeof(*rr);
470 mpa_len = sizeof(*rr);
471
472 if (cep->enhanced_rdma_conn_est) {
473 iovec_num++;
474 iov[iovec_num].iov_base = &cep->mpa.v2_ctrl;
475 iov[iovec_num].iov_len = sizeof(cep->mpa.v2_ctrl);
476 mpa_len += sizeof(cep->mpa.v2_ctrl);
477 }
478 if (pd_len) {
479 iovec_num++;
480 iov[iovec_num].iov_base = (char *)pdata;
481 iov[iovec_num].iov_len = pd_len;
482 mpa_len += pd_len;
483 }
484 if (cep->enhanced_rdma_conn_est)
485 pd_len += sizeof(cep->mpa.v2_ctrl);
486
487 rr->params.pd_len = cpu_to_be16(pd_len);
488
489 rv = kernel_sendmsg(s, &msg, iov, iovec_num + 1, mpa_len);
490
491 return rv < 0 ? rv : 0;
492 }
493
494 /*
495 * Receive MPA Request/Reply header.
496 *
497 * Returns 0 if complete MPA Request/Reply header including
498 * eventual private data was received. Returns -EAGAIN if
499 * header was partially received or negative error code otherwise.
500 *
501 * Context: May be called in process context only
502 */
siw_recv_mpa_rr(struct siw_cep * cep)503 static int siw_recv_mpa_rr(struct siw_cep *cep)
504 {
505 struct mpa_rr *hdr = &cep->mpa.hdr;
506 struct socket *s = cep->sock;
507 u16 pd_len;
508 int rcvd, to_rcv;
509
510 if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr)) {
511 rcvd = ksock_recv(s, (char *)hdr + cep->mpa.bytes_rcvd,
512 sizeof(struct mpa_rr) - cep->mpa.bytes_rcvd,
513 0);
514 if (rcvd <= 0)
515 return -ECONNABORTED;
516
517 cep->mpa.bytes_rcvd += rcvd;
518
519 if (cep->mpa.bytes_rcvd < sizeof(struct mpa_rr))
520 return -EAGAIN;
521
522 if (be16_to_cpu(hdr->params.pd_len) > MPA_MAX_PRIVDATA)
523 return -EPROTO;
524 }
525 pd_len = be16_to_cpu(hdr->params.pd_len);
526
527 /*
528 * At least the MPA Request/Reply header (frame not including
529 * private data) has been received.
530 * Receive (or continue receiving) any private data.
531 */
532 to_rcv = pd_len - (cep->mpa.bytes_rcvd - sizeof(struct mpa_rr));
533
534 if (!to_rcv) {
535 /*
536 * We must have hdr->params.pd_len == 0 and thus received a
537 * complete MPA Request/Reply frame.
538 * Check against peer protocol violation.
539 */
540 u32 word;
541
542 rcvd = ksock_recv(s, (char *)&word, sizeof(word), MSG_DONTWAIT);
543 if (rcvd == -EAGAIN)
544 return 0;
545
546 if (rcvd == 0) {
547 siw_dbg_cep(cep, "peer EOF\n");
548 return -EPIPE;
549 }
550 if (rcvd < 0) {
551 siw_dbg_cep(cep, "error: %d\n", rcvd);
552 return rcvd;
553 }
554 siw_dbg_cep(cep, "peer sent extra data: %d\n", rcvd);
555
556 return -EPROTO;
557 }
558
559 /*
560 * At this point, we must have hdr->params.pd_len != 0.
561 * A private data buffer gets allocated if hdr->params.pd_len != 0.
562 */
563 if (!cep->mpa.pdata) {
564 cep->mpa.pdata = kmalloc(pd_len + 4, GFP_KERNEL);
565 if (!cep->mpa.pdata)
566 return -ENOMEM;
567 }
568 rcvd = ksock_recv(
569 s, cep->mpa.pdata + cep->mpa.bytes_rcvd - sizeof(struct mpa_rr),
570 to_rcv + 4, MSG_DONTWAIT);
571
572 if (rcvd < 0)
573 return rcvd;
574
575 if (rcvd > to_rcv)
576 return -EPROTO;
577
578 cep->mpa.bytes_rcvd += rcvd;
579
580 if (to_rcv == rcvd) {
581 siw_dbg_cep(cep, "%d bytes private data received\n", pd_len);
582 return 0;
583 }
584 return -EAGAIN;
585 }
586
587 /*
588 * siw_proc_mpareq()
589 *
590 * Read MPA Request from socket and signal new connection to IWCM
591 * if success. Caller must hold lock on corresponding listening CEP.
592 */
siw_proc_mpareq(struct siw_cep * cep)593 static int siw_proc_mpareq(struct siw_cep *cep)
594 {
595 struct mpa_rr *req;
596 int version, rv;
597 u16 pd_len;
598
599 rv = siw_recv_mpa_rr(cep);
600 if (rv)
601 return rv;
602
603 req = &cep->mpa.hdr;
604
605 version = __mpa_rr_revision(req->params.bits);
606 pd_len = be16_to_cpu(req->params.pd_len);
607
608 if (version > MPA_REVISION_2)
609 /* allow for 0, 1, and 2 only */
610 return -EPROTO;
611
612 if (memcmp(req->key, MPA_KEY_REQ, 16))
613 return -EPROTO;
614
615 /* Prepare for sending MPA reply */
616 memcpy(req->key, MPA_KEY_REP, 16);
617
618 if (version == MPA_REVISION_2 &&
619 (req->params.bits & MPA_RR_FLAG_ENHANCED)) {
620 /*
621 * MPA version 2 must signal IRD/ORD values and P2P mode
622 * in private data if header flag MPA_RR_FLAG_ENHANCED
623 * is set.
624 */
625 if (pd_len < sizeof(struct mpa_v2_data))
626 goto reject_conn;
627
628 cep->enhanced_rdma_conn_est = true;
629 }
630
631 /* MPA Markers: currently not supported. Marker TX to be added. */
632 if (req->params.bits & MPA_RR_FLAG_MARKERS)
633 goto reject_conn;
634
635 if (req->params.bits & MPA_RR_FLAG_CRC) {
636 /*
637 * RFC 5044, page 27: CRC MUST be used if peer requests it.
638 * siw specific: 'mpa_crc_strict' parameter to reject
639 * connection with CRC if local CRC off enforced by
640 * 'mpa_crc_strict' module parameter.
641 */
642 if (!mpa_crc_required && mpa_crc_strict)
643 goto reject_conn;
644
645 /* Enable CRC if requested by module parameter */
646 if (mpa_crc_required)
647 req->params.bits |= MPA_RR_FLAG_CRC;
648 }
649 if (cep->enhanced_rdma_conn_est) {
650 struct mpa_v2_data *v2 = (struct mpa_v2_data *)cep->mpa.pdata;
651
652 /*
653 * Peer requested ORD becomes requested local IRD,
654 * peer requested IRD becomes requested local ORD.
655 * IRD and ORD get limited by global maximum values.
656 */
657 cep->ord = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
658 cep->ord = min(cep->ord, SIW_MAX_ORD_QP);
659 cep->ird = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
660 cep->ird = min(cep->ird, SIW_MAX_IRD_QP);
661
662 /* May get overwritten by locally negotiated values */
663 cep->mpa.v2_ctrl.ird = htons(cep->ird);
664 cep->mpa.v2_ctrl.ord = htons(cep->ord);
665
666 /*
667 * Support for peer sent zero length Write or Read to
668 * let local side enter RTS. Writes are preferred.
669 * Sends would require pre-posting a Receive and are
670 * not supported.
671 * Propose zero length Write if none of Read and Write
672 * is indicated.
673 */
674 if (v2->ird & MPA_V2_PEER_TO_PEER) {
675 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
676
677 if (v2->ord & MPA_V2_RDMA_WRITE_RTR)
678 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
679 else if (v2->ord & MPA_V2_RDMA_READ_RTR)
680 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_READ_RTR;
681 else
682 cep->mpa.v2_ctrl.ord |= MPA_V2_RDMA_WRITE_RTR;
683 }
684 }
685
686 cep->state = SIW_EPSTATE_RECVD_MPAREQ;
687
688 /* Keep reference until IWCM accepts/rejects */
689 siw_cep_get(cep);
690 rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REQUEST, 0);
691 if (rv)
692 siw_cep_put(cep);
693
694 return rv;
695
696 reject_conn:
697 siw_dbg_cep(cep, "reject: crc %d:%d:%d, m %d:%d\n",
698 req->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
699 mpa_crc_required, mpa_crc_strict,
700 req->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
701
702 req->params.bits &= ~MPA_RR_FLAG_MARKERS;
703 req->params.bits |= MPA_RR_FLAG_REJECT;
704
705 if (!mpa_crc_required && mpa_crc_strict)
706 req->params.bits &= ~MPA_RR_FLAG_CRC;
707
708 if (pd_len)
709 kfree(cep->mpa.pdata);
710
711 cep->mpa.pdata = NULL;
712
713 siw_send_mpareqrep(cep, NULL, 0);
714
715 return -EOPNOTSUPP;
716 }
717
siw_proc_mpareply(struct siw_cep * cep)718 static int siw_proc_mpareply(struct siw_cep *cep)
719 {
720 struct siw_qp_attrs qp_attrs;
721 enum siw_qp_attr_mask qp_attr_mask;
722 struct siw_qp *qp = cep->qp;
723 struct mpa_rr *rep;
724 int rv;
725 u16 rep_ord;
726 u16 rep_ird;
727 bool ird_insufficient = false;
728 enum mpa_v2_ctrl mpa_p2p_mode = MPA_V2_RDMA_NO_RTR;
729
730 rv = siw_recv_mpa_rr(cep);
731 if (rv)
732 goto out_err;
733
734 siw_cancel_mpatimer(cep);
735
736 rep = &cep->mpa.hdr;
737
738 if (__mpa_rr_revision(rep->params.bits) > MPA_REVISION_2) {
739 /* allow for 0, 1, and 2 only */
740 rv = -EPROTO;
741 goto out_err;
742 }
743 if (memcmp(rep->key, MPA_KEY_REP, 16)) {
744 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP, LLP_ETYPE_MPA,
745 LLP_ECODE_INVALID_REQ_RESP, 0);
746 siw_send_terminate(qp);
747 rv = -EPROTO;
748 goto out_err;
749 }
750 if (rep->params.bits & MPA_RR_FLAG_REJECT) {
751 siw_dbg_cep(cep, "got mpa reject\n");
752 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNRESET);
753
754 return -ECONNRESET;
755 }
756 if (try_gso && rep->params.bits & MPA_RR_FLAG_GSO_EXP) {
757 siw_dbg_cep(cep, "peer allows GSO on TX\n");
758 qp->tx_ctx.gso_seg_limit = 0;
759 }
760 if ((rep->params.bits & MPA_RR_FLAG_MARKERS) ||
761 (mpa_crc_required && !(rep->params.bits & MPA_RR_FLAG_CRC)) ||
762 (mpa_crc_strict && !mpa_crc_required &&
763 (rep->params.bits & MPA_RR_FLAG_CRC))) {
764 siw_dbg_cep(cep, "reply unsupp: crc %d:%d:%d, m %d:%d\n",
765 rep->params.bits & MPA_RR_FLAG_CRC ? 1 : 0,
766 mpa_crc_required, mpa_crc_strict,
767 rep->params.bits & MPA_RR_FLAG_MARKERS ? 1 : 0, 0);
768
769 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -ECONNREFUSED);
770
771 return -EINVAL;
772 }
773 if (cep->enhanced_rdma_conn_est) {
774 struct mpa_v2_data *v2;
775
776 if (__mpa_rr_revision(rep->params.bits) < MPA_REVISION_2 ||
777 !(rep->params.bits & MPA_RR_FLAG_ENHANCED)) {
778 /*
779 * Protocol failure: The responder MUST reply with
780 * MPA version 2 and MUST set MPA_RR_FLAG_ENHANCED.
781 */
782 siw_dbg_cep(cep, "mpa reply error: vers %d, enhcd %d\n",
783 __mpa_rr_revision(rep->params.bits),
784 rep->params.bits & MPA_RR_FLAG_ENHANCED ?
785 1 :
786 0);
787
788 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
789 -ECONNRESET);
790 return -EINVAL;
791 }
792 v2 = (struct mpa_v2_data *)cep->mpa.pdata;
793 rep_ird = ntohs(v2->ird) & MPA_IRD_ORD_MASK;
794 rep_ord = ntohs(v2->ord) & MPA_IRD_ORD_MASK;
795
796 if (cep->ird < rep_ord &&
797 (relaxed_ird_negotiation == false ||
798 rep_ord > cep->sdev->attrs.max_ird)) {
799 siw_dbg_cep(cep, "ird %d, rep_ord %d, max_ord %d\n",
800 cep->ird, rep_ord,
801 cep->sdev->attrs.max_ord);
802 ird_insufficient = true;
803 }
804 if (cep->ord > rep_ird && relaxed_ird_negotiation == false) {
805 siw_dbg_cep(cep, "ord %d, rep_ird %d\n", cep->ord,
806 rep_ird);
807 ird_insufficient = true;
808 }
809 /*
810 * Always report negotiated peer values to user,
811 * even if IRD/ORD negotiation failed
812 */
813 cep->ird = rep_ord;
814 cep->ord = rep_ird;
815
816 if (ird_insufficient) {
817 /*
818 * If the initiator IRD is insuffient for the
819 * responder ORD, send a TERM.
820 */
821 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
822 LLP_ETYPE_MPA,
823 LLP_ECODE_INSUFFICIENT_IRD, 0);
824 siw_send_terminate(qp);
825 rv = -ENOMEM;
826 goto out_err;
827 }
828 if (cep->mpa.v2_ctrl_req.ird & MPA_V2_PEER_TO_PEER)
829 mpa_p2p_mode =
830 cep->mpa.v2_ctrl_req.ord &
831 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR);
832
833 /*
834 * Check if we requested P2P mode, and if peer agrees
835 */
836 if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
837 if ((mpa_p2p_mode & v2->ord) == 0) {
838 /*
839 * We requested RTR mode(s), but the peer
840 * did not pick any mode we support.
841 */
842 siw_dbg_cep(cep,
843 "rtr mode: req %2x, got %2x\n",
844 mpa_p2p_mode,
845 v2->ord & (MPA_V2_RDMA_WRITE_RTR |
846 MPA_V2_RDMA_READ_RTR));
847
848 siw_init_terminate(qp, TERM_ERROR_LAYER_LLP,
849 LLP_ETYPE_MPA,
850 LLP_ECODE_NO_MATCHING_RTR,
851 0);
852 siw_send_terminate(qp);
853 rv = -EPROTO;
854 goto out_err;
855 }
856 mpa_p2p_mode = v2->ord & (MPA_V2_RDMA_WRITE_RTR |
857 MPA_V2_RDMA_READ_RTR);
858 }
859 }
860 memset(&qp_attrs, 0, sizeof(qp_attrs));
861
862 if (rep->params.bits & MPA_RR_FLAG_CRC)
863 qp_attrs.flags = SIW_MPA_CRC;
864
865 qp_attrs.irq_size = cep->ird;
866 qp_attrs.orq_size = cep->ord;
867 qp_attrs.sk = cep->sock;
868 qp_attrs.state = SIW_QP_STATE_RTS;
869
870 qp_attr_mask = SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
871 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD | SIW_QP_ATTR_MPA;
872
873 /* Move socket RX/TX under QP control */
874 down_write(&qp->state_lock);
875 if (qp->attrs.state > SIW_QP_STATE_RTR) {
876 rv = -EINVAL;
877 up_write(&qp->state_lock);
878 goto out_err;
879 }
880 rv = siw_qp_modify(qp, &qp_attrs, qp_attr_mask);
881
882 siw_qp_socket_assoc(cep, qp);
883
884 up_write(&qp->state_lock);
885
886 /* Send extra RDMA frame to trigger peer RTS if negotiated */
887 if (mpa_p2p_mode != MPA_V2_RDMA_NO_RTR) {
888 rv = siw_qp_mpa_rts(qp, mpa_p2p_mode);
889 if (rv)
890 goto out_err;
891 }
892 if (!rv) {
893 rv = siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, 0);
894 if (!rv)
895 cep->state = SIW_EPSTATE_RDMA_MODE;
896
897 return 0;
898 }
899
900 out_err:
901 if (rv != -EAGAIN)
902 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY, -EINVAL);
903
904 return rv;
905 }
906
907 /*
908 * siw_accept_newconn - accept an incoming pending connection
909 *
910 */
siw_accept_newconn(struct siw_cep * cep)911 static void siw_accept_newconn(struct siw_cep *cep)
912 {
913 struct socket *s = cep->sock;
914 struct socket *new_s = NULL;
915 struct siw_cep *new_cep = NULL;
916 int rv = 0; /* debug only. should disappear */
917
918 if (cep->state != SIW_EPSTATE_LISTENING)
919 goto error;
920
921 new_cep = siw_cep_alloc(cep->sdev);
922 if (!new_cep)
923 goto error;
924
925 /*
926 * 4: Allocate a sufficient number of work elements
927 * to allow concurrent handling of local + peer close
928 * events, MPA header processing + MPA timeout.
929 */
930 if (siw_cm_alloc_work(new_cep, 4) != 0)
931 goto error;
932
933 /*
934 * Copy saved socket callbacks from listening CEP
935 * and assign new socket with new CEP
936 */
937 new_cep->sk_state_change = cep->sk_state_change;
938 new_cep->sk_data_ready = cep->sk_data_ready;
939 new_cep->sk_write_space = cep->sk_write_space;
940 new_cep->sk_error_report = cep->sk_error_report;
941
942 rv = kernel_accept(s, &new_s, O_NONBLOCK);
943 if (rv != 0) {
944 /*
945 * Connection already aborted by peer..?
946 */
947 siw_dbg_cep(cep, "kernel_accept() error: %d\n", rv);
948 goto error;
949 }
950 new_cep->sock = new_s;
951 siw_cep_get(new_cep);
952 new_s->sk->sk_user_data = new_cep;
953
954 if (siw_tcp_nagle == false)
955 tcp_sock_set_nodelay(new_s->sk);
956 new_cep->state = SIW_EPSTATE_AWAIT_MPAREQ;
957
958 rv = siw_cm_queue_work(new_cep, SIW_CM_WORK_MPATIMEOUT);
959 if (rv)
960 goto error;
961 /*
962 * See siw_proc_mpareq() etc. for the use of new_cep->listen_cep.
963 */
964 new_cep->listen_cep = cep;
965 siw_cep_get(cep);
966
967 if (atomic_read(&new_s->sk->sk_rmem_alloc)) {
968 /*
969 * MPA REQ already queued
970 */
971 siw_dbg_cep(cep, "immediate mpa request\n");
972
973 siw_cep_set_inuse(new_cep);
974 rv = siw_proc_mpareq(new_cep);
975 if (rv != -EAGAIN) {
976 siw_cep_put(cep);
977 new_cep->listen_cep = NULL;
978 if (rv) {
979 siw_cep_set_free(new_cep);
980 goto error;
981 }
982 }
983 siw_cep_set_free(new_cep);
984 }
985 return;
986
987 error:
988 if (new_cep)
989 siw_cep_put(new_cep);
990
991 if (new_s) {
992 siw_socket_disassoc(new_s);
993 sock_release(new_s);
994 new_cep->sock = NULL;
995 }
996 siw_dbg_cep(cep, "error %d\n", rv);
997 }
998
siw_cm_work_handler(struct work_struct * w)999 static void siw_cm_work_handler(struct work_struct *w)
1000 {
1001 struct siw_cm_work *work;
1002 struct siw_cep *cep;
1003 int release_cep = 0, rv = 0;
1004
1005 work = container_of(w, struct siw_cm_work, work.work);
1006 cep = work->cep;
1007
1008 siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
1009 cep->qp ? qp_id(cep->qp) : UINT_MAX,
1010 work->type, cep->state);
1011
1012 siw_cep_set_inuse(cep);
1013
1014 switch (work->type) {
1015 case SIW_CM_WORK_ACCEPT:
1016 siw_accept_newconn(cep);
1017 break;
1018
1019 case SIW_CM_WORK_READ_MPAHDR:
1020 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1021 if (cep->listen_cep) {
1022 siw_cep_set_inuse(cep->listen_cep);
1023
1024 if (cep->listen_cep->state ==
1025 SIW_EPSTATE_LISTENING)
1026 rv = siw_proc_mpareq(cep);
1027 else
1028 rv = -EFAULT;
1029
1030 siw_cep_set_free(cep->listen_cep);
1031
1032 if (rv != -EAGAIN) {
1033 siw_cep_put(cep->listen_cep);
1034 cep->listen_cep = NULL;
1035 if (rv)
1036 siw_cep_put(cep);
1037 }
1038 }
1039 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1040 rv = siw_proc_mpareply(cep);
1041 } else {
1042 /*
1043 * CEP already moved out of MPA handshake.
1044 * any connection management already done.
1045 * silently ignore the mpa packet.
1046 */
1047 if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1048 cep->sock->sk->sk_data_ready(cep->sock->sk);
1049 siw_dbg_cep(cep, "already in RDMA mode");
1050 } else {
1051 siw_dbg_cep(cep, "out of state: %d\n",
1052 cep->state);
1053 }
1054 }
1055 if (rv && rv != -EAGAIN)
1056 release_cep = 1;
1057 break;
1058
1059 case SIW_CM_WORK_CLOSE_LLP:
1060 /*
1061 * QP scheduled LLP close
1062 */
1063 if (cep->qp && cep->qp->term_info.valid)
1064 siw_send_terminate(cep->qp);
1065
1066 if (cep->cm_id)
1067 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1068
1069 release_cep = 1;
1070 break;
1071
1072 case SIW_CM_WORK_PEER_CLOSE:
1073 if (cep->cm_id) {
1074 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1075 /*
1076 * MPA reply not received, but connection drop
1077 */
1078 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1079 -ECONNRESET);
1080 } else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1081 /*
1082 * NOTE: IW_CM_EVENT_DISCONNECT is given just
1083 * to transition IWCM into CLOSING.
1084 */
1085 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
1086 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1087 }
1088 /*
1089 * for other states there is no connection
1090 * known to the IWCM.
1091 */
1092 } else {
1093 if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
1094 /*
1095 * Wait for the ulp/CM to call accept/reject
1096 */
1097 siw_dbg_cep(cep,
1098 "mpa req recvd, wait for ULP\n");
1099 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1100 /*
1101 * Socket close before MPA request received.
1102 */
1103 siw_dbg_cep(cep, "no mpareq: drop listener\n");
1104 siw_cep_put(cep->listen_cep);
1105 cep->listen_cep = NULL;
1106 }
1107 }
1108 release_cep = 1;
1109 break;
1110
1111 case SIW_CM_WORK_MPATIMEOUT:
1112 cep->mpa_timer = NULL;
1113
1114 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1115 /*
1116 * MPA request timed out:
1117 * Hide any partially received private data and signal
1118 * timeout
1119 */
1120 cep->mpa.hdr.params.pd_len = 0;
1121
1122 if (cep->cm_id)
1123 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1124 -ETIMEDOUT);
1125 release_cep = 1;
1126
1127 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1128 /*
1129 * No MPA request received after peer TCP stream setup.
1130 */
1131 if (cep->listen_cep) {
1132 siw_cep_put(cep->listen_cep);
1133 cep->listen_cep = NULL;
1134 }
1135 release_cep = 1;
1136 }
1137 break;
1138
1139 default:
1140 WARN(1, "Undefined CM work type: %d\n", work->type);
1141 }
1142 if (release_cep) {
1143 siw_dbg_cep(cep,
1144 "release: timer=%s, QP[%u]\n",
1145 cep->mpa_timer ? "y" : "n",
1146 cep->qp ? qp_id(cep->qp) : UINT_MAX);
1147
1148 siw_cancel_mpatimer(cep);
1149
1150 cep->state = SIW_EPSTATE_CLOSED;
1151
1152 if (cep->qp) {
1153 struct siw_qp *qp = cep->qp;
1154 /*
1155 * Serialize a potential race with application
1156 * closing the QP and calling siw_qp_cm_drop()
1157 */
1158 siw_qp_get(qp);
1159 siw_cep_set_free(cep);
1160
1161 siw_qp_llp_close(qp);
1162 siw_qp_put(qp);
1163
1164 siw_cep_set_inuse(cep);
1165 cep->qp = NULL;
1166 siw_qp_put(qp);
1167 }
1168 if (cep->sock) {
1169 siw_socket_disassoc(cep->sock);
1170 sock_release(cep->sock);
1171 cep->sock = NULL;
1172 }
1173 if (cep->cm_id) {
1174 cep->cm_id->rem_ref(cep->cm_id);
1175 cep->cm_id = NULL;
1176 siw_cep_put(cep);
1177 }
1178 }
1179 siw_cep_set_free(cep);
1180 siw_put_work(work);
1181 siw_cep_put(cep);
1182 }
1183
1184 static struct workqueue_struct *siw_cm_wq;
1185
siw_cm_queue_work(struct siw_cep * cep,enum siw_work_type type)1186 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
1187 {
1188 struct siw_cm_work *work = siw_get_work(cep);
1189 unsigned long delay = 0;
1190
1191 if (!work) {
1192 siw_dbg_cep(cep, "failed with no work available\n");
1193 return -ENOMEM;
1194 }
1195 work->type = type;
1196 work->cep = cep;
1197
1198 siw_cep_get(cep);
1199
1200 INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
1201
1202 if (type == SIW_CM_WORK_MPATIMEOUT) {
1203 cep->mpa_timer = work;
1204
1205 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
1206 delay = MPAREQ_TIMEOUT;
1207 else
1208 delay = MPAREP_TIMEOUT;
1209 }
1210 siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
1211 cep->qp ? qp_id(cep->qp) : -1, type, delay);
1212
1213 queue_delayed_work(siw_cm_wq, &work->work, delay);
1214
1215 return 0;
1216 }
1217
siw_cm_llp_data_ready(struct sock * sk)1218 static void siw_cm_llp_data_ready(struct sock *sk)
1219 {
1220 struct siw_cep *cep;
1221
1222 trace_sk_data_ready(sk);
1223
1224 read_lock(&sk->sk_callback_lock);
1225
1226 cep = sk_to_cep(sk);
1227 if (!cep)
1228 goto out;
1229
1230 siw_dbg_cep(cep, "state: %d\n", cep->state);
1231
1232 switch (cep->state) {
1233 case SIW_EPSTATE_RDMA_MODE:
1234 case SIW_EPSTATE_LISTENING:
1235 break;
1236
1237 case SIW_EPSTATE_AWAIT_MPAREQ:
1238 case SIW_EPSTATE_AWAIT_MPAREP:
1239 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
1240 break;
1241
1242 default:
1243 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
1244 break;
1245 }
1246 out:
1247 read_unlock(&sk->sk_callback_lock);
1248 }
1249
siw_cm_llp_write_space(struct sock * sk)1250 static void siw_cm_llp_write_space(struct sock *sk)
1251 {
1252 struct siw_cep *cep = sk_to_cep(sk);
1253
1254 if (cep)
1255 siw_dbg_cep(cep, "state: %d\n", cep->state);
1256 }
1257
siw_cm_llp_error_report(struct sock * sk)1258 static void siw_cm_llp_error_report(struct sock *sk)
1259 {
1260 struct siw_cep *cep = sk_to_cep(sk);
1261
1262 if (cep) {
1263 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
1264 sk->sk_err, sk->sk_state, cep->state);
1265 cep->sk_error_report(sk);
1266 }
1267 }
1268
siw_cm_llp_state_change(struct sock * sk)1269 static void siw_cm_llp_state_change(struct sock *sk)
1270 {
1271 struct siw_cep *cep;
1272 void (*orig_state_change)(struct sock *s);
1273
1274 read_lock(&sk->sk_callback_lock);
1275
1276 cep = sk_to_cep(sk);
1277 if (!cep) {
1278 /* endpoint already disassociated */
1279 read_unlock(&sk->sk_callback_lock);
1280 return;
1281 }
1282 orig_state_change = cep->sk_state_change;
1283
1284 siw_dbg_cep(cep, "state: %d\n", cep->state);
1285
1286 switch (sk->sk_state) {
1287 case TCP_ESTABLISHED:
1288 /*
1289 * handle accepting socket as special case where only
1290 * new connection is possible
1291 */
1292 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
1293 break;
1294
1295 case TCP_CLOSE:
1296 case TCP_CLOSE_WAIT:
1297 if (cep->qp)
1298 cep->qp->tx_ctx.tx_suspend = 1;
1299 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
1300 break;
1301
1302 default:
1303 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
1304 }
1305 read_unlock(&sk->sk_callback_lock);
1306 orig_state_change(sk);
1307 }
1308
kernel_bindconnect(struct socket * s,struct sockaddr * laddr,struct sockaddr * raddr,bool afonly)1309 static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
1310 struct sockaddr *raddr, bool afonly)
1311 {
1312 int rv, flags = 0;
1313 size_t size = laddr->sa_family == AF_INET ?
1314 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
1315
1316 /*
1317 * Make address available again asap.
1318 */
1319 sock_set_reuseaddr(s->sk);
1320
1321 if (afonly) {
1322 rv = ip6_sock_set_v6only(s->sk);
1323 if (rv)
1324 return rv;
1325 }
1326
1327 rv = s->ops->bind(s, laddr, size);
1328 if (rv < 0)
1329 return rv;
1330
1331 rv = s->ops->connect(s, raddr, size, flags);
1332
1333 return rv < 0 ? rv : 0;
1334 }
1335
siw_connect(struct iw_cm_id * id,struct iw_cm_conn_param * params)1336 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1337 {
1338 struct siw_device *sdev = to_siw_dev(id->device);
1339 struct siw_qp *qp;
1340 struct siw_cep *cep = NULL;
1341 struct socket *s = NULL;
1342 struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
1343 *raddr = (struct sockaddr *)&id->remote_addr;
1344 bool p2p_mode = peer_to_peer, v4 = true;
1345 u16 pd_len = params->private_data_len;
1346 int version = mpa_version, rv;
1347
1348 if (pd_len > MPA_MAX_PRIVDATA)
1349 return -EINVAL;
1350
1351 if (params->ird > sdev->attrs.max_ird ||
1352 params->ord > sdev->attrs.max_ord)
1353 return -ENOMEM;
1354
1355 if (laddr->sa_family == AF_INET6)
1356 v4 = false;
1357 else if (laddr->sa_family != AF_INET)
1358 return -EAFNOSUPPORT;
1359
1360 /*
1361 * Respect any iwarp port mapping: Use mapped remote address
1362 * if valid. Local address must not be mapped, since siw
1363 * uses kernel TCP stack.
1364 */
1365 if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
1366 to_sockaddr_in6(id->remote_addr).sin6_port != 0)
1367 raddr = (struct sockaddr *)&id->m_remote_addr;
1368
1369 qp = siw_qp_id2obj(sdev, params->qpn);
1370 if (!qp) {
1371 WARN(1, "[QP %u] does not exist\n", params->qpn);
1372 rv = -EINVAL;
1373 goto error;
1374 }
1375 siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr,
1376 raddr);
1377
1378 rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
1379 if (rv < 0)
1380 goto error;
1381
1382 /*
1383 * NOTE: For simplification, connect() is called in blocking
1384 * mode. Might be reconsidered for async connection setup at
1385 * TCP level.
1386 */
1387 rv = kernel_bindconnect(s, laddr, raddr, id->afonly);
1388 if (rv != 0) {
1389 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
1390 goto error;
1391 }
1392 if (siw_tcp_nagle == false)
1393 tcp_sock_set_nodelay(s->sk);
1394 cep = siw_cep_alloc(sdev);
1395 if (!cep) {
1396 rv = -ENOMEM;
1397 goto error;
1398 }
1399 siw_cep_set_inuse(cep);
1400
1401 /* Associate QP with CEP */
1402 siw_cep_get(cep);
1403 qp->cep = cep;
1404
1405 /* siw_qp_get(qp) already done by QP lookup */
1406 cep->qp = qp;
1407
1408 id->add_ref(id);
1409 cep->cm_id = id;
1410
1411 /*
1412 * 4: Allocate a sufficient number of work elements
1413 * to allow concurrent handling of local + peer close
1414 * events, MPA header processing + MPA timeout.
1415 */
1416 rv = siw_cm_alloc_work(cep, 4);
1417 if (rv != 0) {
1418 rv = -ENOMEM;
1419 goto error;
1420 }
1421 cep->ird = params->ird;
1422 cep->ord = params->ord;
1423
1424 if (p2p_mode && cep->ord == 0)
1425 cep->ord = 1;
1426
1427 cep->state = SIW_EPSTATE_CONNECTING;
1428
1429 /*
1430 * Associate CEP with socket
1431 */
1432 siw_cep_socket_assoc(cep, s);
1433
1434 cep->state = SIW_EPSTATE_AWAIT_MPAREP;
1435
1436 /*
1437 * Set MPA Request bits: CRC if required, no MPA Markers,
1438 * MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
1439 */
1440 cep->mpa.hdr.params.bits = 0;
1441 if (version > MPA_REVISION_2) {
1442 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
1443 version = MPA_REVISION_2;
1444 /* Adjust also module parameter */
1445 mpa_version = MPA_REVISION_2;
1446 }
1447 __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
1448
1449 if (try_gso)
1450 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
1451
1452 if (mpa_crc_required)
1453 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
1454
1455 /*
1456 * If MPA version == 2:
1457 * o Include ORD and IRD.
1458 * o Indicate peer-to-peer mode, if required by module
1459 * parameter 'peer_to_peer'.
1460 */
1461 if (version == MPA_REVISION_2) {
1462 cep->enhanced_rdma_conn_est = true;
1463 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
1464
1465 cep->mpa.v2_ctrl.ird = htons(cep->ird);
1466 cep->mpa.v2_ctrl.ord = htons(cep->ord);
1467
1468 if (p2p_mode) {
1469 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
1470 cep->mpa.v2_ctrl.ord |= rtr_type;
1471 }
1472 /* Remember own P2P mode requested */
1473 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
1474 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
1475 }
1476 memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
1477
1478 rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
1479 /*
1480 * Reset private data.
1481 */
1482 cep->mpa.hdr.params.pd_len = 0;
1483
1484 if (rv >= 0) {
1485 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
1486 if (!rv) {
1487 siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
1488 siw_cep_set_free(cep);
1489 return 0;
1490 }
1491 }
1492 error:
1493 siw_dbg(id->device, "failed: %d\n", rv);
1494
1495 if (cep) {
1496 siw_socket_disassoc(s);
1497 sock_release(s);
1498 cep->sock = NULL;
1499
1500 cep->qp = NULL;
1501
1502 cep->cm_id = NULL;
1503 id->rem_ref(id);
1504 siw_cep_put(cep);
1505
1506 qp->cep = NULL;
1507 siw_cep_put(cep);
1508
1509 cep->state = SIW_EPSTATE_CLOSED;
1510
1511 siw_cep_set_free(cep);
1512
1513 siw_cep_put(cep);
1514
1515 } else if (s) {
1516 sock_release(s);
1517 }
1518 if (qp)
1519 siw_qp_put(qp);
1520
1521 return rv;
1522 }
1523
1524 /*
1525 * siw_accept - Let SoftiWARP accept an RDMA connection request
1526 *
1527 * @id: New connection management id to be used for accepted
1528 * connection request
1529 * @params: Connection parameters provided by ULP for accepting connection
1530 *
1531 * Transition QP to RTS state, associate new CM id @id with accepted CEP
1532 * and get prepared for TCP input by installing socket callbacks.
1533 * Then send MPA Reply and generate the "connection established" event.
1534 * Socket callbacks must be installed before sending MPA Reply, because
1535 * the latter may cause a first RDMA message to arrive from the RDMA Initiator
1536 * side very quickly, at which time the socket callbacks must be ready.
1537 */
siw_accept(struct iw_cm_id * id,struct iw_cm_conn_param * params)1538 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1539 {
1540 struct siw_device *sdev = to_siw_dev(id->device);
1541 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1542 struct siw_qp *qp;
1543 struct siw_qp_attrs qp_attrs;
1544 int rv, max_priv_data = MPA_MAX_PRIVDATA;
1545 bool wait_for_peer_rts = false;
1546
1547 siw_cep_set_inuse(cep);
1548 siw_cep_put(cep);
1549
1550 /* Free lingering inbound private data */
1551 if (cep->mpa.hdr.params.pd_len) {
1552 cep->mpa.hdr.params.pd_len = 0;
1553 kfree(cep->mpa.pdata);
1554 cep->mpa.pdata = NULL;
1555 }
1556 siw_cancel_mpatimer(cep);
1557
1558 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1559 siw_dbg_cep(cep, "out of state\n");
1560
1561 siw_cep_set_free(cep);
1562 siw_cep_put(cep);
1563
1564 return -ECONNRESET;
1565 }
1566 qp = siw_qp_id2obj(sdev, params->qpn);
1567 if (!qp) {
1568 WARN(1, "[QP %d] does not exist\n", params->qpn);
1569 siw_cep_set_free(cep);
1570 siw_cep_put(cep);
1571
1572 return -EINVAL;
1573 }
1574 down_write(&qp->state_lock);
1575 if (qp->attrs.state > SIW_QP_STATE_RTR) {
1576 rv = -EINVAL;
1577 up_write(&qp->state_lock);
1578 goto error;
1579 }
1580 siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
1581
1582 if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
1583 siw_dbg_cep(cep, "peer allows GSO on TX\n");
1584 qp->tx_ctx.gso_seg_limit = 0;
1585 }
1586 if (params->ord > sdev->attrs.max_ord ||
1587 params->ird > sdev->attrs.max_ird) {
1588 siw_dbg_cep(
1589 cep,
1590 "[QP %u]: ord %d (max %d), ird %d (max %d)\n",
1591 qp_id(qp), params->ord, sdev->attrs.max_ord,
1592 params->ird, sdev->attrs.max_ird);
1593 rv = -EINVAL;
1594 up_write(&qp->state_lock);
1595 goto error;
1596 }
1597 if (cep->enhanced_rdma_conn_est)
1598 max_priv_data -= sizeof(struct mpa_v2_data);
1599
1600 if (params->private_data_len > max_priv_data) {
1601 siw_dbg_cep(
1602 cep,
1603 "[QP %u]: private data length: %d (max %d)\n",
1604 qp_id(qp), params->private_data_len, max_priv_data);
1605 rv = -EINVAL;
1606 up_write(&qp->state_lock);
1607 goto error;
1608 }
1609 if (cep->enhanced_rdma_conn_est) {
1610 if (params->ord > cep->ord) {
1611 if (relaxed_ird_negotiation) {
1612 params->ord = cep->ord;
1613 } else {
1614 cep->ird = params->ird;
1615 cep->ord = params->ord;
1616 rv = -EINVAL;
1617 up_write(&qp->state_lock);
1618 goto error;
1619 }
1620 }
1621 if (params->ird < cep->ird) {
1622 if (relaxed_ird_negotiation &&
1623 cep->ird <= sdev->attrs.max_ird)
1624 params->ird = cep->ird;
1625 else {
1626 rv = -ENOMEM;
1627 up_write(&qp->state_lock);
1628 goto error;
1629 }
1630 }
1631 if (cep->mpa.v2_ctrl.ord &
1632 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
1633 wait_for_peer_rts = true;
1634 /*
1635 * Signal back negotiated IRD and ORD values
1636 */
1637 cep->mpa.v2_ctrl.ord =
1638 htons(params->ord & MPA_IRD_ORD_MASK) |
1639 (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
1640 cep->mpa.v2_ctrl.ird =
1641 htons(params->ird & MPA_IRD_ORD_MASK) |
1642 (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
1643 }
1644 cep->ird = params->ird;
1645 cep->ord = params->ord;
1646
1647 cep->cm_id = id;
1648 id->add_ref(id);
1649
1650 memset(&qp_attrs, 0, sizeof(qp_attrs));
1651 qp_attrs.orq_size = cep->ord;
1652 qp_attrs.irq_size = cep->ird;
1653 qp_attrs.sk = cep->sock;
1654 if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
1655 qp_attrs.flags = SIW_MPA_CRC;
1656 qp_attrs.state = SIW_QP_STATE_RTS;
1657
1658 siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
1659
1660 /* Associate QP with CEP */
1661 siw_cep_get(cep);
1662 qp->cep = cep;
1663
1664 /* siw_qp_get(qp) already done by QP lookup */
1665 cep->qp = qp;
1666
1667 cep->state = SIW_EPSTATE_RDMA_MODE;
1668
1669 /* Move socket RX/TX under QP control */
1670 rv = siw_qp_modify(qp, &qp_attrs,
1671 SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
1672 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
1673 SIW_QP_ATTR_MPA);
1674 up_write(&qp->state_lock);
1675
1676 if (rv)
1677 goto error;
1678
1679 siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
1680 qp_id(qp), params->private_data_len);
1681
1682 rv = siw_send_mpareqrep(cep, params->private_data,
1683 params->private_data_len);
1684 if (rv != 0)
1685 goto error;
1686
1687 if (wait_for_peer_rts) {
1688 siw_sk_assign_rtr_upcalls(cep);
1689 } else {
1690 siw_qp_socket_assoc(cep, qp);
1691 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
1692 if (rv)
1693 goto error;
1694 }
1695 siw_cep_set_free(cep);
1696
1697 return 0;
1698 error:
1699 siw_socket_disassoc(cep->sock);
1700 sock_release(cep->sock);
1701 cep->sock = NULL;
1702
1703 cep->state = SIW_EPSTATE_CLOSED;
1704
1705 if (cep->cm_id) {
1706 cep->cm_id->rem_ref(id);
1707 cep->cm_id = NULL;
1708 }
1709 if (qp->cep) {
1710 siw_cep_put(cep);
1711 qp->cep = NULL;
1712 }
1713 cep->qp = NULL;
1714 siw_qp_put(qp);
1715
1716 siw_cep_set_free(cep);
1717 siw_cep_put(cep);
1718
1719 return rv;
1720 }
1721
1722 /*
1723 * siw_reject()
1724 *
1725 * Local connection reject case. Send private data back to peer,
1726 * close connection and dereference connection id.
1727 */
siw_reject(struct iw_cm_id * id,const void * pdata,u8 pd_len)1728 int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
1729 {
1730 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1731
1732 siw_cep_set_inuse(cep);
1733 siw_cep_put(cep);
1734
1735 siw_cancel_mpatimer(cep);
1736
1737 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1738 siw_dbg_cep(cep, "out of state\n");
1739
1740 siw_cep_set_free(cep);
1741 siw_cep_put(cep); /* put last reference */
1742
1743 return -ECONNRESET;
1744 }
1745 siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
1746 pd_len);
1747
1748 if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
1749 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
1750 siw_send_mpareqrep(cep, pdata, pd_len);
1751 }
1752 siw_socket_disassoc(cep->sock);
1753 sock_release(cep->sock);
1754 cep->sock = NULL;
1755
1756 cep->state = SIW_EPSTATE_CLOSED;
1757
1758 siw_cep_set_free(cep);
1759 siw_cep_put(cep);
1760
1761 return 0;
1762 }
1763
1764 /*
1765 * siw_create_listen - Create resources for a listener's IWCM ID @id
1766 *
1767 * Starts listen on the socket address id->local_addr.
1768 *
1769 */
siw_create_listen(struct iw_cm_id * id,int backlog)1770 int siw_create_listen(struct iw_cm_id *id, int backlog)
1771 {
1772 struct socket *s;
1773 struct siw_cep *cep = NULL;
1774 struct siw_device *sdev = to_siw_dev(id->device);
1775 int addr_family = id->local_addr.ss_family;
1776 int rv = 0;
1777
1778 if (addr_family != AF_INET && addr_family != AF_INET6)
1779 return -EAFNOSUPPORT;
1780
1781 rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
1782 if (rv < 0)
1783 return rv;
1784
1785 /*
1786 * Allow binding local port when still in TIME_WAIT from last close.
1787 */
1788 sock_set_reuseaddr(s->sk);
1789
1790 if (addr_family == AF_INET) {
1791 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
1792
1793 /* For wildcard addr, limit binding to current device only */
1794 if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
1795 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1796
1797 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1798 sizeof(struct sockaddr_in));
1799 } else {
1800 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
1801
1802 if (id->afonly) {
1803 rv = ip6_sock_set_v6only(s->sk);
1804 if (rv) {
1805 siw_dbg(id->device,
1806 "ip6_sock_set_v6only erro: %d\n", rv);
1807 goto error;
1808 }
1809 }
1810
1811 /* For wildcard addr, limit binding to current device only */
1812 if (ipv6_addr_any(&laddr->sin6_addr))
1813 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1814
1815 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1816 sizeof(struct sockaddr_in6));
1817 }
1818 if (rv) {
1819 siw_dbg(id->device, "socket bind error: %d\n", rv);
1820 goto error;
1821 }
1822 cep = siw_cep_alloc(sdev);
1823 if (!cep) {
1824 rv = -ENOMEM;
1825 goto error;
1826 }
1827 siw_cep_socket_assoc(cep, s);
1828
1829 rv = siw_cm_alloc_work(cep, backlog);
1830 if (rv) {
1831 siw_dbg(id->device,
1832 "alloc_work error %d, backlog %d\n",
1833 rv, backlog);
1834 goto error;
1835 }
1836 rv = s->ops->listen(s, backlog);
1837 if (rv) {
1838 siw_dbg(id->device, "listen error %d\n", rv);
1839 goto error;
1840 }
1841 cep->cm_id = id;
1842 id->add_ref(id);
1843
1844 /*
1845 * In case of a wildcard rdma_listen on a multi-homed device,
1846 * a listener's IWCM id is associated with more than one listening CEP.
1847 *
1848 * We currently use id->provider_data in three different ways:
1849 *
1850 * o For a listener's IWCM id, id->provider_data points to
1851 * the list_head of the list of listening CEPs.
1852 * Uses: siw_create_listen(), siw_destroy_listen()
1853 *
1854 * o For each accepted passive-side IWCM id, id->provider_data
1855 * points to the CEP itself. This is a consequence of
1856 * - siw_cm_upcall() setting event.provider_data = cep and
1857 * - the IWCM's cm_conn_req_handler() setting provider_data of the
1858 * new passive-side IWCM id equal to event.provider_data
1859 * Uses: siw_accept(), siw_reject()
1860 *
1861 * o For an active-side IWCM id, id->provider_data is not used at all.
1862 *
1863 */
1864 if (!id->provider_data) {
1865 id->provider_data =
1866 kmalloc(sizeof(struct list_head), GFP_KERNEL);
1867 if (!id->provider_data) {
1868 rv = -ENOMEM;
1869 goto error;
1870 }
1871 INIT_LIST_HEAD((struct list_head *)id->provider_data);
1872 }
1873 list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
1874 cep->state = SIW_EPSTATE_LISTENING;
1875
1876 siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
1877
1878 return 0;
1879
1880 error:
1881 siw_dbg(id->device, "failed: %d\n", rv);
1882
1883 if (cep) {
1884 siw_cep_set_inuse(cep);
1885
1886 if (cep->cm_id) {
1887 cep->cm_id->rem_ref(cep->cm_id);
1888 cep->cm_id = NULL;
1889 }
1890 cep->sock = NULL;
1891 siw_socket_disassoc(s);
1892 cep->state = SIW_EPSTATE_CLOSED;
1893
1894 siw_cep_set_free(cep);
1895 siw_cep_put(cep);
1896 }
1897 sock_release(s);
1898
1899 return rv;
1900 }
1901
siw_drop_listeners(struct iw_cm_id * id)1902 static void siw_drop_listeners(struct iw_cm_id *id)
1903 {
1904 struct list_head *p, *tmp;
1905
1906 /*
1907 * In case of a wildcard rdma_listen on a multi-homed device,
1908 * a listener's IWCM id is associated with more than one listening CEP.
1909 */
1910 list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
1911 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
1912
1913 list_del(p);
1914
1915 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
1916
1917 siw_cep_set_inuse(cep);
1918
1919 if (cep->cm_id) {
1920 cep->cm_id->rem_ref(cep->cm_id);
1921 cep->cm_id = NULL;
1922 }
1923 if (cep->sock) {
1924 siw_socket_disassoc(cep->sock);
1925 sock_release(cep->sock);
1926 cep->sock = NULL;
1927 }
1928 cep->state = SIW_EPSTATE_CLOSED;
1929 siw_cep_set_free(cep);
1930 siw_cep_put(cep);
1931 }
1932 }
1933
siw_destroy_listen(struct iw_cm_id * id)1934 int siw_destroy_listen(struct iw_cm_id *id)
1935 {
1936 if (!id->provider_data) {
1937 siw_dbg(id->device, "no cep(s)\n");
1938 return 0;
1939 }
1940 siw_drop_listeners(id);
1941 kfree(id->provider_data);
1942 id->provider_data = NULL;
1943
1944 return 0;
1945 }
1946
siw_cm_init(void)1947 int siw_cm_init(void)
1948 {
1949 /*
1950 * create_single_workqueue for strict ordering
1951 */
1952 siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
1953 if (!siw_cm_wq)
1954 return -ENOMEM;
1955
1956 return 0;
1957 }
1958
siw_cm_exit(void)1959 void siw_cm_exit(void)
1960 {
1961 if (siw_cm_wq)
1962 destroy_workqueue(siw_cm_wq);
1963 }
1964