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_cancel_mpatimer(new_cep);
980 siw_cep_set_free(new_cep);
981 goto error;
982 }
983 }
984 siw_cep_set_free(new_cep);
985 }
986 return;
987
988 error:
989 if (new_cep)
990 siw_cep_put(new_cep);
991
992 if (new_s) {
993 siw_socket_disassoc(new_s);
994 sock_release(new_s);
995 new_cep->sock = NULL;
996 }
997 siw_dbg_cep(cep, "error %d\n", rv);
998 }
999
siw_cm_work_handler(struct work_struct * w)1000 static void siw_cm_work_handler(struct work_struct *w)
1001 {
1002 struct siw_cm_work *work;
1003 struct siw_cep *cep;
1004 int release_cep = 0, rv = 0;
1005
1006 work = container_of(w, struct siw_cm_work, work.work);
1007 cep = work->cep;
1008
1009 siw_dbg_cep(cep, "[QP %u]: work type: %d, state %d\n",
1010 cep->qp ? qp_id(cep->qp) : UINT_MAX,
1011 work->type, cep->state);
1012
1013 siw_cep_set_inuse(cep);
1014
1015 switch (work->type) {
1016 case SIW_CM_WORK_ACCEPT:
1017 siw_accept_newconn(cep);
1018 break;
1019
1020 case SIW_CM_WORK_READ_MPAHDR:
1021 if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1022 if (cep->listen_cep) {
1023 siw_cep_set_inuse(cep->listen_cep);
1024
1025 if (cep->listen_cep->state ==
1026 SIW_EPSTATE_LISTENING)
1027 rv = siw_proc_mpareq(cep);
1028 else
1029 rv = -EFAULT;
1030
1031 siw_cep_set_free(cep->listen_cep);
1032
1033 if (rv != -EAGAIN) {
1034 siw_cep_put(cep->listen_cep);
1035 cep->listen_cep = NULL;
1036 if (rv)
1037 siw_cep_put(cep);
1038 }
1039 }
1040 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1041 rv = siw_proc_mpareply(cep);
1042 } else {
1043 /*
1044 * CEP already moved out of MPA handshake.
1045 * any connection management already done.
1046 * silently ignore the mpa packet.
1047 */
1048 if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1049 cep->sock->sk->sk_data_ready(cep->sock->sk);
1050 siw_dbg_cep(cep, "already in RDMA mode");
1051 } else {
1052 siw_dbg_cep(cep, "out of state: %d\n",
1053 cep->state);
1054 }
1055 }
1056 if (rv && rv != -EAGAIN)
1057 release_cep = 1;
1058 break;
1059
1060 case SIW_CM_WORK_CLOSE_LLP:
1061 /*
1062 * QP scheduled LLP close
1063 */
1064 if (cep->qp && cep->qp->term_info.valid)
1065 siw_send_terminate(cep->qp);
1066
1067 if (cep->cm_id)
1068 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1069
1070 release_cep = 1;
1071 break;
1072
1073 case SIW_CM_WORK_PEER_CLOSE:
1074 if (cep->cm_id) {
1075 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1076 /*
1077 * MPA reply not received, but connection drop
1078 */
1079 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1080 -ECONNRESET);
1081 } else if (cep->state == SIW_EPSTATE_RDMA_MODE) {
1082 /*
1083 * NOTE: IW_CM_EVENT_DISCONNECT is given just
1084 * to transition IWCM into CLOSING.
1085 */
1086 siw_cm_upcall(cep, IW_CM_EVENT_DISCONNECT, 0);
1087 siw_cm_upcall(cep, IW_CM_EVENT_CLOSE, 0);
1088 }
1089 /*
1090 * for other states there is no connection
1091 * known to the IWCM.
1092 */
1093 } else {
1094 if (cep->state == SIW_EPSTATE_RECVD_MPAREQ) {
1095 /*
1096 * Wait for the ulp/CM to call accept/reject
1097 */
1098 siw_dbg_cep(cep,
1099 "mpa req recvd, wait for ULP\n");
1100 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1101 /*
1102 * Socket close before MPA request received.
1103 */
1104 if (cep->listen_cep) {
1105 siw_dbg_cep(cep,
1106 "no mpareq: drop listener\n");
1107 siw_cep_put(cep->listen_cep);
1108 cep->listen_cep = NULL;
1109 }
1110 }
1111 }
1112 release_cep = 1;
1113 break;
1114
1115 case SIW_CM_WORK_MPATIMEOUT:
1116 cep->mpa_timer = NULL;
1117
1118 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP) {
1119 /*
1120 * MPA request timed out:
1121 * Hide any partially received private data and signal
1122 * timeout
1123 */
1124 cep->mpa.hdr.params.pd_len = 0;
1125
1126 if (cep->cm_id)
1127 siw_cm_upcall(cep, IW_CM_EVENT_CONNECT_REPLY,
1128 -ETIMEDOUT);
1129 release_cep = 1;
1130
1131 } else if (cep->state == SIW_EPSTATE_AWAIT_MPAREQ) {
1132 /*
1133 * No MPA request received after peer TCP stream setup.
1134 */
1135 if (cep->listen_cep) {
1136 siw_cep_put(cep->listen_cep);
1137 cep->listen_cep = NULL;
1138 }
1139 release_cep = 1;
1140 }
1141 break;
1142
1143 default:
1144 WARN(1, "Undefined CM work type: %d\n", work->type);
1145 }
1146 if (release_cep) {
1147 siw_dbg_cep(cep,
1148 "release: timer=%s, QP[%u]\n",
1149 cep->mpa_timer ? "y" : "n",
1150 cep->qp ? qp_id(cep->qp) : UINT_MAX);
1151
1152 siw_cancel_mpatimer(cep);
1153
1154 cep->state = SIW_EPSTATE_CLOSED;
1155
1156 if (cep->qp) {
1157 struct siw_qp *qp = cep->qp;
1158 /*
1159 * Serialize a potential race with application
1160 * closing the QP and calling siw_qp_cm_drop()
1161 */
1162 siw_qp_get(qp);
1163 siw_cep_set_free(cep);
1164
1165 siw_qp_llp_close(qp);
1166 siw_qp_put(qp);
1167
1168 siw_cep_set_inuse(cep);
1169 cep->qp = NULL;
1170 siw_qp_put(qp);
1171 }
1172 if (cep->sock) {
1173 siw_socket_disassoc(cep->sock);
1174 sock_release(cep->sock);
1175 cep->sock = NULL;
1176 }
1177 if (cep->cm_id) {
1178 cep->cm_id->rem_ref(cep->cm_id);
1179 cep->cm_id = NULL;
1180 siw_cep_put(cep);
1181 }
1182 }
1183 siw_cep_set_free(cep);
1184 siw_put_work(work);
1185 siw_cep_put(cep);
1186 }
1187
1188 static struct workqueue_struct *siw_cm_wq;
1189
siw_cm_queue_work(struct siw_cep * cep,enum siw_work_type type)1190 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type)
1191 {
1192 struct siw_cm_work *work = siw_get_work(cep);
1193 unsigned long delay = 0;
1194
1195 if (!work) {
1196 siw_dbg_cep(cep, "failed with no work available\n");
1197 return -ENOMEM;
1198 }
1199 work->type = type;
1200 work->cep = cep;
1201
1202 siw_cep_get(cep);
1203
1204 INIT_DELAYED_WORK(&work->work, siw_cm_work_handler);
1205
1206 if (type == SIW_CM_WORK_MPATIMEOUT) {
1207 cep->mpa_timer = work;
1208
1209 if (cep->state == SIW_EPSTATE_AWAIT_MPAREP)
1210 delay = MPAREQ_TIMEOUT;
1211 else
1212 delay = MPAREP_TIMEOUT;
1213 }
1214 siw_dbg_cep(cep, "[QP %u]: work type: %d, timeout %lu\n",
1215 cep->qp ? qp_id(cep->qp) : -1, type, delay);
1216
1217 queue_delayed_work(siw_cm_wq, &work->work, delay);
1218
1219 return 0;
1220 }
1221
siw_cm_llp_data_ready(struct sock * sk)1222 static void siw_cm_llp_data_ready(struct sock *sk)
1223 {
1224 struct siw_cep *cep;
1225
1226 trace_sk_data_ready(sk);
1227
1228 read_lock(&sk->sk_callback_lock);
1229
1230 cep = sk_to_cep(sk);
1231 if (!cep)
1232 goto out;
1233
1234 siw_dbg_cep(cep, "cep state: %d, socket state %d\n",
1235 cep->state, sk->sk_state);
1236
1237 if (sk->sk_state != TCP_ESTABLISHED)
1238 goto out;
1239
1240 switch (cep->state) {
1241 case SIW_EPSTATE_RDMA_MODE:
1242 case SIW_EPSTATE_LISTENING:
1243 break;
1244
1245 case SIW_EPSTATE_AWAIT_MPAREQ:
1246 case SIW_EPSTATE_AWAIT_MPAREP:
1247 siw_cm_queue_work(cep, SIW_CM_WORK_READ_MPAHDR);
1248 break;
1249
1250 default:
1251 siw_dbg_cep(cep, "unexpected data, state %d\n", cep->state);
1252 break;
1253 }
1254 out:
1255 read_unlock(&sk->sk_callback_lock);
1256 }
1257
siw_cm_llp_write_space(struct sock * sk)1258 static void siw_cm_llp_write_space(struct sock *sk)
1259 {
1260 struct siw_cep *cep = sk_to_cep(sk);
1261
1262 if (cep)
1263 siw_dbg_cep(cep, "state: %d\n", cep->state);
1264 }
1265
siw_cm_llp_error_report(struct sock * sk)1266 static void siw_cm_llp_error_report(struct sock *sk)
1267 {
1268 struct siw_cep *cep = sk_to_cep(sk);
1269
1270 if (cep) {
1271 siw_dbg_cep(cep, "error %d, socket state: %d, cep state: %d\n",
1272 sk->sk_err, sk->sk_state, cep->state);
1273 cep->sk_error_report(sk);
1274 }
1275 }
1276
siw_cm_llp_state_change(struct sock * sk)1277 static void siw_cm_llp_state_change(struct sock *sk)
1278 {
1279 struct siw_cep *cep;
1280 void (*orig_state_change)(struct sock *s);
1281
1282 read_lock(&sk->sk_callback_lock);
1283
1284 cep = sk_to_cep(sk);
1285 if (!cep) {
1286 /* endpoint already disassociated */
1287 read_unlock(&sk->sk_callback_lock);
1288 return;
1289 }
1290 orig_state_change = cep->sk_state_change;
1291
1292 siw_dbg_cep(cep, "state: %d\n", cep->state);
1293
1294 switch (sk->sk_state) {
1295 case TCP_ESTABLISHED:
1296 /*
1297 * handle accepting socket as special case where only
1298 * new connection is possible
1299 */
1300 siw_cm_queue_work(cep, SIW_CM_WORK_ACCEPT);
1301 break;
1302
1303 case TCP_CLOSE:
1304 case TCP_CLOSE_WAIT:
1305 if (cep->qp)
1306 cep->qp->tx_ctx.tx_suspend = 1;
1307 siw_cm_queue_work(cep, SIW_CM_WORK_PEER_CLOSE);
1308 break;
1309
1310 default:
1311 siw_dbg_cep(cep, "unexpected socket state %d\n", sk->sk_state);
1312 }
1313 read_unlock(&sk->sk_callback_lock);
1314 orig_state_change(sk);
1315 }
1316
kernel_bindconnect(struct socket * s,struct sockaddr * laddr,struct sockaddr * raddr,bool afonly)1317 static int kernel_bindconnect(struct socket *s, struct sockaddr *laddr,
1318 struct sockaddr *raddr, bool afonly)
1319 {
1320 int rv, flags = 0;
1321 size_t size = laddr->sa_family == AF_INET ?
1322 sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6);
1323
1324 /*
1325 * Make address available again asap.
1326 */
1327 sock_set_reuseaddr(s->sk);
1328
1329 if (afonly) {
1330 rv = ip6_sock_set_v6only(s->sk);
1331 if (rv)
1332 return rv;
1333 }
1334
1335 rv = s->ops->bind(s, laddr, size);
1336 if (rv < 0)
1337 return rv;
1338
1339 rv = s->ops->connect(s, raddr, size, flags);
1340
1341 return rv < 0 ? rv : 0;
1342 }
1343
siw_connect(struct iw_cm_id * id,struct iw_cm_conn_param * params)1344 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1345 {
1346 struct siw_device *sdev = to_siw_dev(id->device);
1347 struct siw_qp *qp;
1348 struct siw_cep *cep = NULL;
1349 struct socket *s = NULL;
1350 struct sockaddr *laddr = (struct sockaddr *)&id->local_addr,
1351 *raddr = (struct sockaddr *)&id->remote_addr;
1352 bool p2p_mode = peer_to_peer, v4 = true;
1353 u16 pd_len = params->private_data_len;
1354 int version = mpa_version, rv;
1355
1356 if (pd_len > MPA_MAX_PRIVDATA)
1357 return -EINVAL;
1358
1359 if (params->ird > sdev->attrs.max_ird ||
1360 params->ord > sdev->attrs.max_ord)
1361 return -ENOMEM;
1362
1363 if (laddr->sa_family == AF_INET6)
1364 v4 = false;
1365 else if (laddr->sa_family != AF_INET)
1366 return -EAFNOSUPPORT;
1367
1368 /*
1369 * Respect any iwarp port mapping: Use mapped remote address
1370 * if valid. Local address must not be mapped, since siw
1371 * uses kernel TCP stack.
1372 */
1373 if ((v4 && to_sockaddr_in(id->remote_addr).sin_port != 0) ||
1374 to_sockaddr_in6(id->remote_addr).sin6_port != 0)
1375 raddr = (struct sockaddr *)&id->m_remote_addr;
1376
1377 qp = siw_qp_id2obj(sdev, params->qpn);
1378 if (!qp) {
1379 WARN(1, "[QP %u] does not exist\n", params->qpn);
1380 rv = -EINVAL;
1381 goto error;
1382 }
1383 siw_dbg_qp(qp, "pd_len %d, laddr %pISp, raddr %pISp\n", pd_len, laddr,
1384 raddr);
1385
1386 rv = sock_create(v4 ? AF_INET : AF_INET6, SOCK_STREAM, IPPROTO_TCP, &s);
1387 if (rv < 0)
1388 goto error;
1389
1390 /*
1391 * NOTE: For simplification, connect() is called in blocking
1392 * mode. Might be reconsidered for async connection setup at
1393 * TCP level.
1394 */
1395 rv = kernel_bindconnect(s, laddr, raddr, id->afonly);
1396 if (rv != 0) {
1397 siw_dbg_qp(qp, "kernel_bindconnect: error %d\n", rv);
1398 goto error;
1399 }
1400 if (siw_tcp_nagle == false)
1401 tcp_sock_set_nodelay(s->sk);
1402 cep = siw_cep_alloc(sdev);
1403 if (!cep) {
1404 rv = -ENOMEM;
1405 goto error;
1406 }
1407 siw_cep_set_inuse(cep);
1408
1409 /* Associate QP with CEP */
1410 siw_cep_get(cep);
1411 qp->cep = cep;
1412
1413 /* siw_qp_get(qp) already done by QP lookup */
1414 cep->qp = qp;
1415
1416 id->add_ref(id);
1417 cep->cm_id = id;
1418
1419 /*
1420 * 4: Allocate a sufficient number of work elements
1421 * to allow concurrent handling of local + peer close
1422 * events, MPA header processing + MPA timeout.
1423 */
1424 rv = siw_cm_alloc_work(cep, 4);
1425 if (rv != 0) {
1426 rv = -ENOMEM;
1427 goto error;
1428 }
1429 cep->ird = params->ird;
1430 cep->ord = params->ord;
1431
1432 if (p2p_mode && cep->ord == 0)
1433 cep->ord = 1;
1434
1435 cep->state = SIW_EPSTATE_CONNECTING;
1436
1437 /*
1438 * Associate CEP with socket
1439 */
1440 siw_cep_socket_assoc(cep, s);
1441
1442 cep->state = SIW_EPSTATE_AWAIT_MPAREP;
1443
1444 /*
1445 * Set MPA Request bits: CRC if required, no MPA Markers,
1446 * MPA Rev. according to module parameter 'mpa_version', Key 'Request'.
1447 */
1448 cep->mpa.hdr.params.bits = 0;
1449 if (version > MPA_REVISION_2) {
1450 pr_warn("Setting MPA version to %u\n", MPA_REVISION_2);
1451 version = MPA_REVISION_2;
1452 /* Adjust also module parameter */
1453 mpa_version = MPA_REVISION_2;
1454 }
1455 __mpa_rr_set_revision(&cep->mpa.hdr.params.bits, version);
1456
1457 if (try_gso)
1458 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_GSO_EXP;
1459
1460 if (mpa_crc_required)
1461 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_CRC;
1462
1463 /*
1464 * If MPA version == 2:
1465 * o Include ORD and IRD.
1466 * o Indicate peer-to-peer mode, if required by module
1467 * parameter 'peer_to_peer'.
1468 */
1469 if (version == MPA_REVISION_2) {
1470 cep->enhanced_rdma_conn_est = true;
1471 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_ENHANCED;
1472
1473 cep->mpa.v2_ctrl.ird = htons(cep->ird);
1474 cep->mpa.v2_ctrl.ord = htons(cep->ord);
1475
1476 if (p2p_mode) {
1477 cep->mpa.v2_ctrl.ird |= MPA_V2_PEER_TO_PEER;
1478 cep->mpa.v2_ctrl.ord |= rtr_type;
1479 }
1480 /* Remember own P2P mode requested */
1481 cep->mpa.v2_ctrl_req.ird = cep->mpa.v2_ctrl.ird;
1482 cep->mpa.v2_ctrl_req.ord = cep->mpa.v2_ctrl.ord;
1483 }
1484 memcpy(cep->mpa.hdr.key, MPA_KEY_REQ, 16);
1485
1486 rv = siw_send_mpareqrep(cep, params->private_data, pd_len);
1487 /*
1488 * Reset private data.
1489 */
1490 cep->mpa.hdr.params.pd_len = 0;
1491
1492 if (rv >= 0) {
1493 rv = siw_cm_queue_work(cep, SIW_CM_WORK_MPATIMEOUT);
1494 if (!rv) {
1495 siw_dbg_cep(cep, "[QP %u]: exit\n", qp_id(qp));
1496 siw_cep_set_free(cep);
1497 return 0;
1498 }
1499 }
1500 error:
1501 siw_dbg(id->device, "failed: %d\n", rv);
1502
1503 if (cep) {
1504 siw_socket_disassoc(s);
1505 sock_release(s);
1506 cep->sock = NULL;
1507
1508 cep->qp = NULL;
1509
1510 cep->cm_id = NULL;
1511 id->rem_ref(id);
1512
1513 qp->cep = NULL;
1514 siw_cep_put(cep);
1515
1516 cep->state = SIW_EPSTATE_CLOSED;
1517
1518 siw_cep_set_free(cep);
1519
1520 siw_cep_put(cep);
1521
1522 } else if (s) {
1523 sock_release(s);
1524 }
1525 if (qp)
1526 siw_qp_put(qp);
1527
1528 return rv;
1529 }
1530
1531 /*
1532 * siw_accept - Let SoftiWARP accept an RDMA connection request
1533 *
1534 * @id: New connection management id to be used for accepted
1535 * connection request
1536 * @params: Connection parameters provided by ULP for accepting connection
1537 *
1538 * Transition QP to RTS state, associate new CM id @id with accepted CEP
1539 * and get prepared for TCP input by installing socket callbacks.
1540 * Then send MPA Reply and generate the "connection established" event.
1541 * Socket callbacks must be installed before sending MPA Reply, because
1542 * the latter may cause a first RDMA message to arrive from the RDMA Initiator
1543 * side very quickly, at which time the socket callbacks must be ready.
1544 */
siw_accept(struct iw_cm_id * id,struct iw_cm_conn_param * params)1545 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *params)
1546 {
1547 struct siw_device *sdev = to_siw_dev(id->device);
1548 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1549 struct siw_qp *qp;
1550 struct siw_qp_attrs qp_attrs;
1551 int rv, max_priv_data = MPA_MAX_PRIVDATA;
1552 bool wait_for_peer_rts = false;
1553
1554 siw_cep_set_inuse(cep);
1555 siw_cep_put(cep);
1556
1557 /* Free lingering inbound private data */
1558 if (cep->mpa.hdr.params.pd_len) {
1559 cep->mpa.hdr.params.pd_len = 0;
1560 kfree(cep->mpa.pdata);
1561 cep->mpa.pdata = NULL;
1562 }
1563 siw_cancel_mpatimer(cep);
1564
1565 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1566 siw_dbg_cep(cep, "out of state\n");
1567
1568 siw_cep_set_free(cep);
1569 siw_cep_put(cep);
1570
1571 return -ECONNRESET;
1572 }
1573 qp = siw_qp_id2obj(sdev, params->qpn);
1574 if (!qp) {
1575 WARN(1, "[QP %d] does not exist\n", params->qpn);
1576 siw_cep_set_free(cep);
1577 siw_cep_put(cep);
1578
1579 return -EINVAL;
1580 }
1581 down_write(&qp->state_lock);
1582 if (qp->attrs.state > SIW_QP_STATE_RTR) {
1583 rv = -EINVAL;
1584 up_write(&qp->state_lock);
1585 goto error;
1586 }
1587 siw_dbg_cep(cep, "[QP %d]\n", params->qpn);
1588
1589 if (try_gso && cep->mpa.hdr.params.bits & MPA_RR_FLAG_GSO_EXP) {
1590 siw_dbg_cep(cep, "peer allows GSO on TX\n");
1591 qp->tx_ctx.gso_seg_limit = 0;
1592 }
1593 if (params->ord > sdev->attrs.max_ord ||
1594 params->ird > sdev->attrs.max_ird) {
1595 siw_dbg_cep(
1596 cep,
1597 "[QP %u]: ord %d (max %d), ird %d (max %d)\n",
1598 qp_id(qp), params->ord, sdev->attrs.max_ord,
1599 params->ird, sdev->attrs.max_ird);
1600 rv = -EINVAL;
1601 up_write(&qp->state_lock);
1602 goto error;
1603 }
1604 if (cep->enhanced_rdma_conn_est)
1605 max_priv_data -= sizeof(struct mpa_v2_data);
1606
1607 if (params->private_data_len > max_priv_data) {
1608 siw_dbg_cep(
1609 cep,
1610 "[QP %u]: private data length: %d (max %d)\n",
1611 qp_id(qp), params->private_data_len, max_priv_data);
1612 rv = -EINVAL;
1613 up_write(&qp->state_lock);
1614 goto error;
1615 }
1616 if (cep->enhanced_rdma_conn_est) {
1617 if (params->ord > cep->ord) {
1618 if (relaxed_ird_negotiation) {
1619 params->ord = cep->ord;
1620 } else {
1621 cep->ird = params->ird;
1622 cep->ord = params->ord;
1623 rv = -EINVAL;
1624 up_write(&qp->state_lock);
1625 goto error;
1626 }
1627 }
1628 if (params->ird < cep->ird) {
1629 if (relaxed_ird_negotiation &&
1630 cep->ird <= sdev->attrs.max_ird)
1631 params->ird = cep->ird;
1632 else {
1633 rv = -ENOMEM;
1634 up_write(&qp->state_lock);
1635 goto error;
1636 }
1637 }
1638 if (cep->mpa.v2_ctrl.ord &
1639 (MPA_V2_RDMA_WRITE_RTR | MPA_V2_RDMA_READ_RTR))
1640 wait_for_peer_rts = true;
1641 /*
1642 * Signal back negotiated IRD and ORD values
1643 */
1644 cep->mpa.v2_ctrl.ord =
1645 htons(params->ord & MPA_IRD_ORD_MASK) |
1646 (cep->mpa.v2_ctrl.ord & ~MPA_V2_MASK_IRD_ORD);
1647 cep->mpa.v2_ctrl.ird =
1648 htons(params->ird & MPA_IRD_ORD_MASK) |
1649 (cep->mpa.v2_ctrl.ird & ~MPA_V2_MASK_IRD_ORD);
1650 }
1651 cep->ird = params->ird;
1652 cep->ord = params->ord;
1653
1654 cep->cm_id = id;
1655 id->add_ref(id);
1656
1657 memset(&qp_attrs, 0, sizeof(qp_attrs));
1658 qp_attrs.orq_size = cep->ord;
1659 qp_attrs.irq_size = cep->ird;
1660 qp_attrs.sk = cep->sock;
1661 if (cep->mpa.hdr.params.bits & MPA_RR_FLAG_CRC)
1662 qp_attrs.flags = SIW_MPA_CRC;
1663 qp_attrs.state = SIW_QP_STATE_RTS;
1664
1665 siw_dbg_cep(cep, "[QP%u]: moving to rts\n", qp_id(qp));
1666
1667 /* Associate QP with CEP */
1668 siw_cep_get(cep);
1669 qp->cep = cep;
1670
1671 /* siw_qp_get(qp) already done by QP lookup */
1672 cep->qp = qp;
1673
1674 cep->state = SIW_EPSTATE_RDMA_MODE;
1675
1676 /* Move socket RX/TX under QP control */
1677 rv = siw_qp_modify(qp, &qp_attrs,
1678 SIW_QP_ATTR_STATE | SIW_QP_ATTR_LLP_HANDLE |
1679 SIW_QP_ATTR_ORD | SIW_QP_ATTR_IRD |
1680 SIW_QP_ATTR_MPA);
1681 up_write(&qp->state_lock);
1682
1683 if (rv)
1684 goto error;
1685
1686 siw_dbg_cep(cep, "[QP %u]: send mpa reply, %d byte pdata\n",
1687 qp_id(qp), params->private_data_len);
1688
1689 rv = siw_send_mpareqrep(cep, params->private_data,
1690 params->private_data_len);
1691 if (rv != 0)
1692 goto error;
1693
1694 if (wait_for_peer_rts) {
1695 siw_sk_assign_rtr_upcalls(cep);
1696 } else {
1697 siw_qp_socket_assoc(cep, qp);
1698 rv = siw_cm_upcall(cep, IW_CM_EVENT_ESTABLISHED, 0);
1699 if (rv)
1700 goto error;
1701 }
1702 siw_cep_set_free(cep);
1703
1704 return 0;
1705 error:
1706 siw_socket_disassoc(cep->sock);
1707 sock_release(cep->sock);
1708 cep->sock = NULL;
1709
1710 cep->state = SIW_EPSTATE_CLOSED;
1711
1712 if (cep->cm_id) {
1713 cep->cm_id->rem_ref(id);
1714 cep->cm_id = NULL;
1715 }
1716 if (qp->cep) {
1717 siw_cep_put(cep);
1718 qp->cep = NULL;
1719 }
1720 cep->qp = NULL;
1721 siw_qp_put(qp);
1722
1723 siw_cep_set_free(cep);
1724 siw_cep_put(cep);
1725
1726 return rv;
1727 }
1728
1729 /*
1730 * siw_reject()
1731 *
1732 * Local connection reject case. Send private data back to peer,
1733 * close connection and dereference connection id.
1734 */
siw_reject(struct iw_cm_id * id,const void * pdata,u8 pd_len)1735 int siw_reject(struct iw_cm_id *id, const void *pdata, u8 pd_len)
1736 {
1737 struct siw_cep *cep = (struct siw_cep *)id->provider_data;
1738
1739 siw_cep_set_inuse(cep);
1740 siw_cep_put(cep);
1741
1742 siw_cancel_mpatimer(cep);
1743
1744 if (cep->state != SIW_EPSTATE_RECVD_MPAREQ) {
1745 siw_dbg_cep(cep, "out of state\n");
1746
1747 siw_cep_set_free(cep);
1748 siw_cep_put(cep); /* put last reference */
1749
1750 return -ECONNRESET;
1751 }
1752 siw_dbg_cep(cep, "cep->state %d, pd_len %d\n", cep->state,
1753 pd_len);
1754
1755 if (__mpa_rr_revision(cep->mpa.hdr.params.bits) >= MPA_REVISION_1) {
1756 cep->mpa.hdr.params.bits |= MPA_RR_FLAG_REJECT; /* reject */
1757 siw_send_mpareqrep(cep, pdata, pd_len);
1758 }
1759 siw_socket_disassoc(cep->sock);
1760 sock_release(cep->sock);
1761 cep->sock = NULL;
1762
1763 cep->state = SIW_EPSTATE_CLOSED;
1764
1765 siw_cep_set_free(cep);
1766 siw_cep_put(cep);
1767
1768 return 0;
1769 }
1770
1771 /*
1772 * siw_create_listen - Create resources for a listener's IWCM ID @id
1773 *
1774 * Starts listen on the socket address id->local_addr.
1775 *
1776 */
siw_create_listen(struct iw_cm_id * id,int backlog)1777 int siw_create_listen(struct iw_cm_id *id, int backlog)
1778 {
1779 struct socket *s;
1780 struct siw_cep *cep = NULL;
1781 struct siw_device *sdev = to_siw_dev(id->device);
1782 int addr_family = id->local_addr.ss_family;
1783 int rv = 0;
1784
1785 if (addr_family != AF_INET && addr_family != AF_INET6)
1786 return -EAFNOSUPPORT;
1787
1788 rv = sock_create(addr_family, SOCK_STREAM, IPPROTO_TCP, &s);
1789 if (rv < 0)
1790 return rv;
1791
1792 /*
1793 * Allow binding local port when still in TIME_WAIT from last close.
1794 */
1795 sock_set_reuseaddr(s->sk);
1796
1797 if (addr_family == AF_INET) {
1798 struct sockaddr_in *laddr = &to_sockaddr_in(id->local_addr);
1799
1800 /* For wildcard addr, limit binding to current device only */
1801 if (ipv4_is_zeronet(laddr->sin_addr.s_addr))
1802 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1803
1804 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1805 sizeof(struct sockaddr_in));
1806 } else {
1807 struct sockaddr_in6 *laddr = &to_sockaddr_in6(id->local_addr);
1808
1809 if (id->afonly) {
1810 rv = ip6_sock_set_v6only(s->sk);
1811 if (rv) {
1812 siw_dbg(id->device,
1813 "ip6_sock_set_v6only erro: %d\n", rv);
1814 goto error;
1815 }
1816 }
1817
1818 /* For wildcard addr, limit binding to current device only */
1819 if (ipv6_addr_any(&laddr->sin6_addr))
1820 s->sk->sk_bound_dev_if = sdev->netdev->ifindex;
1821
1822 rv = s->ops->bind(s, (struct sockaddr *)laddr,
1823 sizeof(struct sockaddr_in6));
1824 }
1825 if (rv) {
1826 siw_dbg(id->device, "socket bind error: %d\n", rv);
1827 goto error;
1828 }
1829 cep = siw_cep_alloc(sdev);
1830 if (!cep) {
1831 rv = -ENOMEM;
1832 goto error;
1833 }
1834 siw_cep_socket_assoc(cep, s);
1835
1836 rv = siw_cm_alloc_work(cep, backlog);
1837 if (rv) {
1838 siw_dbg(id->device,
1839 "alloc_work error %d, backlog %d\n",
1840 rv, backlog);
1841 goto error;
1842 }
1843 rv = s->ops->listen(s, backlog);
1844 if (rv) {
1845 siw_dbg(id->device, "listen error %d\n", rv);
1846 goto error;
1847 }
1848 cep->cm_id = id;
1849 id->add_ref(id);
1850
1851 /*
1852 * In case of a wildcard rdma_listen on a multi-homed device,
1853 * a listener's IWCM id is associated with more than one listening CEP.
1854 *
1855 * We currently use id->provider_data in three different ways:
1856 *
1857 * o For a listener's IWCM id, id->provider_data points to
1858 * the list_head of the list of listening CEPs.
1859 * Uses: siw_create_listen(), siw_destroy_listen()
1860 *
1861 * o For each accepted passive-side IWCM id, id->provider_data
1862 * points to the CEP itself. This is a consequence of
1863 * - siw_cm_upcall() setting event.provider_data = cep and
1864 * - the IWCM's cm_conn_req_handler() setting provider_data of the
1865 * new passive-side IWCM id equal to event.provider_data
1866 * Uses: siw_accept(), siw_reject()
1867 *
1868 * o For an active-side IWCM id, id->provider_data is not used at all.
1869 *
1870 */
1871 if (!id->provider_data) {
1872 id->provider_data =
1873 kmalloc(sizeof(struct list_head), GFP_KERNEL);
1874 if (!id->provider_data) {
1875 rv = -ENOMEM;
1876 goto error;
1877 }
1878 INIT_LIST_HEAD((struct list_head *)id->provider_data);
1879 }
1880 list_add_tail(&cep->listenq, (struct list_head *)id->provider_data);
1881 cep->state = SIW_EPSTATE_LISTENING;
1882
1883 siw_dbg(id->device, "Listen at laddr %pISp\n", &id->local_addr);
1884
1885 return 0;
1886
1887 error:
1888 siw_dbg(id->device, "failed: %d\n", rv);
1889
1890 if (cep) {
1891 siw_cep_set_inuse(cep);
1892
1893 if (cep->cm_id) {
1894 cep->cm_id->rem_ref(cep->cm_id);
1895 cep->cm_id = NULL;
1896 }
1897 cep->sock = NULL;
1898 siw_socket_disassoc(s);
1899 cep->state = SIW_EPSTATE_CLOSED;
1900
1901 siw_cep_set_free(cep);
1902 siw_cep_put(cep);
1903 }
1904 sock_release(s);
1905
1906 return rv;
1907 }
1908
siw_drop_listeners(struct iw_cm_id * id)1909 static void siw_drop_listeners(struct iw_cm_id *id)
1910 {
1911 struct list_head *p, *tmp;
1912
1913 /*
1914 * In case of a wildcard rdma_listen on a multi-homed device,
1915 * a listener's IWCM id is associated with more than one listening CEP.
1916 */
1917 list_for_each_safe(p, tmp, (struct list_head *)id->provider_data) {
1918 struct siw_cep *cep = list_entry(p, struct siw_cep, listenq);
1919
1920 list_del(p);
1921
1922 siw_dbg_cep(cep, "drop cep, state %d\n", cep->state);
1923
1924 siw_cep_set_inuse(cep);
1925
1926 if (cep->cm_id) {
1927 cep->cm_id->rem_ref(cep->cm_id);
1928 cep->cm_id = NULL;
1929 }
1930 if (cep->sock) {
1931 siw_socket_disassoc(cep->sock);
1932 sock_release(cep->sock);
1933 cep->sock = NULL;
1934 }
1935 cep->state = SIW_EPSTATE_CLOSED;
1936 siw_cep_set_free(cep);
1937 siw_cep_put(cep);
1938 }
1939 }
1940
siw_destroy_listen(struct iw_cm_id * id)1941 int siw_destroy_listen(struct iw_cm_id *id)
1942 {
1943 if (!id->provider_data) {
1944 siw_dbg(id->device, "no cep(s)\n");
1945 return 0;
1946 }
1947 siw_drop_listeners(id);
1948 kfree(id->provider_data);
1949 id->provider_data = NULL;
1950
1951 return 0;
1952 }
1953
siw_cm_init(void)1954 int siw_cm_init(void)
1955 {
1956 /*
1957 * create_single_workqueue for strict ordering
1958 */
1959 siw_cm_wq = create_singlethread_workqueue("siw_cm_wq");
1960 if (!siw_cm_wq)
1961 return -ENOMEM;
1962
1963 return 0;
1964 }
1965
siw_cm_exit(void)1966 void siw_cm_exit(void)
1967 {
1968 if (siw_cm_wq)
1969 destroy_workqueue(siw_cm_wq);
1970 }
1971