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efi/arm: Fix boot crash with CONFIG_CPUMASK_OFFSTACK=y
[mirror_ubuntu-artful-kernel.git] / net / smc / af_smc.c
1 /*
2 * Shared Memory Communications over RDMA (SMC-R) and RoCE
3 *
4 * AF_SMC protocol family socket handler keeping the AF_INET sock address type
5 * applies to SOCK_STREAM sockets only
6 * offers an alternative communication option for TCP-protocol sockets
7 * applicable with RoCE-cards only
8 *
9 * Initial restrictions:
10 * - non-blocking connect postponed
11 * - IPv6 support postponed
12 * - support for alternate links postponed
13 * - partial support for non-blocking sockets only
14 * - support for urgent data postponed
15 *
16 * Copyright IBM Corp. 2016
17 *
18 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
19 * based on prototype from Frank Blaschka
20 */
21
22 #define KMSG_COMPONENT "smc"
23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
24
25 #include <linux/module.h>
26 #include <linux/socket.h>
27 #include <linux/inetdevice.h>
28 #include <linux/workqueue.h>
29 #include <linux/in.h>
30 #include <net/sock.h>
31 #include <net/tcp.h>
32 #include <net/smc.h>
33
34 #include "smc.h"
35 #include "smc_clc.h"
36 #include "smc_llc.h"
37 #include "smc_cdc.h"
38 #include "smc_core.h"
39 #include "smc_ib.h"
40 #include "smc_pnet.h"
41 #include "smc_tx.h"
42 #include "smc_rx.h"
43 #include "smc_close.h"
44
45 static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
46 * creation
47 */
48
49 struct smc_lgr_list smc_lgr_list = { /* established link groups */
50 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
51 .list = LIST_HEAD_INIT(smc_lgr_list.list),
52 };
53
54 static void smc_tcp_listen_work(struct work_struct *);
55
56 static void smc_set_keepalive(struct sock *sk, int val)
57 {
58 struct smc_sock *smc = smc_sk(sk);
59
60 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
61 }
62
63 static struct smc_hashinfo smc_v4_hashinfo = {
64 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
65 };
66
67 int smc_hash_sk(struct sock *sk)
68 {
69 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
70 struct hlist_head *head;
71
72 head = &h->ht;
73
74 write_lock_bh(&h->lock);
75 sk_add_node(sk, head);
76 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
77 write_unlock_bh(&h->lock);
78
79 return 0;
80 }
81 EXPORT_SYMBOL_GPL(smc_hash_sk);
82
83 void smc_unhash_sk(struct sock *sk)
84 {
85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
86
87 write_lock_bh(&h->lock);
88 if (sk_del_node_init(sk))
89 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
90 write_unlock_bh(&h->lock);
91 }
92 EXPORT_SYMBOL_GPL(smc_unhash_sk);
93
94 struct proto smc_proto = {
95 .name = "SMC",
96 .owner = THIS_MODULE,
97 .keepalive = smc_set_keepalive,
98 .hash = smc_hash_sk,
99 .unhash = smc_unhash_sk,
100 .obj_size = sizeof(struct smc_sock),
101 .h.smc_hash = &smc_v4_hashinfo,
102 .slab_flags = SLAB_DESTROY_BY_RCU,
103 };
104 EXPORT_SYMBOL_GPL(smc_proto);
105
106 static int smc_release(struct socket *sock)
107 {
108 struct sock *sk = sock->sk;
109 struct smc_sock *smc;
110 int rc = 0;
111
112 if (!sk)
113 goto out;
114
115 smc = smc_sk(sk);
116 sock_hold(sk);
117 if (sk->sk_state == SMC_LISTEN)
118 /* smc_close_non_accepted() is called and acquires
119 * sock lock for child sockets again
120 */
121 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
122 else
123 lock_sock(sk);
124
125 if (smc->use_fallback) {
126 sk->sk_state = SMC_CLOSED;
127 sk->sk_state_change(sk);
128 } else {
129 rc = smc_close_active(smc);
130 sock_set_flag(sk, SOCK_DEAD);
131 sk->sk_shutdown |= SHUTDOWN_MASK;
132 }
133 if (smc->clcsock) {
134 sock_release(smc->clcsock);
135 smc->clcsock = NULL;
136 }
137
138 /* detach socket */
139 sock_orphan(sk);
140 sock->sk = NULL;
141 if (smc->use_fallback) {
142 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
143 } else if (sk->sk_state == SMC_CLOSED) {
144 smc_conn_free(&smc->conn);
145 schedule_delayed_work(&smc->sock_put_work,
146 SMC_CLOSE_SOCK_PUT_DELAY);
147 }
148 sk->sk_prot->unhash(sk);
149 release_sock(sk);
150
151 sock_put(sk);
152 out:
153 return rc;
154 }
155
156 static void smc_destruct(struct sock *sk)
157 {
158 if (sk->sk_state != SMC_CLOSED)
159 return;
160 if (!sock_flag(sk, SOCK_DEAD))
161 return;
162
163 sk_refcnt_debug_dec(sk);
164 }
165
166 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
167 {
168 struct smc_sock *smc;
169 struct sock *sk;
170
171 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
172 if (!sk)
173 return NULL;
174
175 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
176 sk->sk_state = SMC_INIT;
177 sk->sk_destruct = smc_destruct;
178 sk->sk_protocol = SMCPROTO_SMC;
179 smc = smc_sk(sk);
180 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
181 INIT_LIST_HEAD(&smc->accept_q);
182 spin_lock_init(&smc->accept_q_lock);
183 INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work);
184 sk->sk_prot->hash(sk);
185 sk_refcnt_debug_inc(sk);
186
187 return sk;
188 }
189
190 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
191 int addr_len)
192 {
193 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
194 struct sock *sk = sock->sk;
195 struct smc_sock *smc;
196 int rc;
197
198 smc = smc_sk(sk);
199
200 /* replicate tests from inet_bind(), to be safe wrt. future changes */
201 rc = -EINVAL;
202 if (addr_len < sizeof(struct sockaddr_in))
203 goto out;
204
205 rc = -EAFNOSUPPORT;
206 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
207 if ((addr->sin_family != AF_INET) &&
208 ((addr->sin_family != AF_UNSPEC) ||
209 (addr->sin_addr.s_addr != htonl(INADDR_ANY))))
210 goto out;
211
212 lock_sock(sk);
213
214 /* Check if socket is already active */
215 rc = -EINVAL;
216 if (sk->sk_state != SMC_INIT)
217 goto out_rel;
218
219 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
220 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
221
222 out_rel:
223 release_sock(sk);
224 out:
225 return rc;
226 }
227
228 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
229 unsigned long mask)
230 {
231 /* options we don't get control via setsockopt for */
232 nsk->sk_type = osk->sk_type;
233 nsk->sk_sndbuf = osk->sk_sndbuf;
234 nsk->sk_rcvbuf = osk->sk_rcvbuf;
235 nsk->sk_sndtimeo = osk->sk_sndtimeo;
236 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
237 nsk->sk_mark = osk->sk_mark;
238 nsk->sk_priority = osk->sk_priority;
239 nsk->sk_rcvlowat = osk->sk_rcvlowat;
240 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
241 nsk->sk_err = osk->sk_err;
242
243 nsk->sk_flags &= ~mask;
244 nsk->sk_flags |= osk->sk_flags & mask;
245 }
246
247 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
248 (1UL << SOCK_KEEPOPEN) | \
249 (1UL << SOCK_LINGER) | \
250 (1UL << SOCK_BROADCAST) | \
251 (1UL << SOCK_TIMESTAMP) | \
252 (1UL << SOCK_DBG) | \
253 (1UL << SOCK_RCVTSTAMP) | \
254 (1UL << SOCK_RCVTSTAMPNS) | \
255 (1UL << SOCK_LOCALROUTE) | \
256 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
257 (1UL << SOCK_RXQ_OVFL) | \
258 (1UL << SOCK_WIFI_STATUS) | \
259 (1UL << SOCK_NOFCS) | \
260 (1UL << SOCK_FILTER_LOCKED))
261 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
262 * clc socket (since smc is not called for these options from net/core)
263 */
264 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
265 {
266 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
267 }
268
269 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
270 (1UL << SOCK_KEEPOPEN) | \
271 (1UL << SOCK_LINGER) | \
272 (1UL << SOCK_DBG))
273 /* copy only settings and flags relevant for smc from clc to smc socket */
274 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
275 {
276 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
277 }
278
279 /* determine subnet and mask of internal TCP socket */
280 int smc_netinfo_by_tcpsk(struct socket *clcsock,
281 __be32 *subnet, u8 *prefix_len)
282 {
283 struct dst_entry *dst = sk_dst_get(clcsock->sk);
284 struct sockaddr_in addr;
285 int rc = -ENOENT;
286 int len;
287
288 if (!dst) {
289 rc = -ENOTCONN;
290 goto out;
291 }
292 if (!dst->dev) {
293 rc = -ENODEV;
294 goto out_rel;
295 }
296
297 /* get address to which the internal TCP socket is bound */
298 kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len);
299 /* analyze IPv4 specific data of net_device belonging to TCP socket */
300 for_ifa(dst->dev->ip_ptr) {
301 if (ifa->ifa_address != addr.sin_addr.s_addr)
302 continue;
303 *prefix_len = inet_mask_len(ifa->ifa_mask);
304 *subnet = ifa->ifa_address & ifa->ifa_mask;
305 rc = 0;
306 break;
307 } endfor_ifa(dst->dev->ip_ptr);
308
309 out_rel:
310 dst_release(dst);
311 out:
312 return rc;
313 }
314
315 static int smc_clnt_conf_first_link(struct smc_sock *smc, union ib_gid *gid)
316 {
317 struct smc_link_group *lgr = smc->conn.lgr;
318 struct smc_link *link;
319 int rest;
320 int rc;
321
322 link = &lgr->lnk[SMC_SINGLE_LINK];
323 /* receive CONFIRM LINK request from server over RoCE fabric */
324 rest = wait_for_completion_interruptible_timeout(
325 &link->llc_confirm,
326 SMC_LLC_WAIT_FIRST_TIME);
327 if (rest <= 0) {
328 struct smc_clc_msg_decline dclc;
329
330 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
331 SMC_CLC_DECLINE);
332 return rc;
333 }
334
335 rc = smc_ib_modify_qp_rts(link);
336 if (rc)
337 return SMC_CLC_DECL_INTERR;
338
339 smc_wr_remember_qp_attr(link);
340 /* send CONFIRM LINK response over RoCE fabric */
341 rc = smc_llc_send_confirm_link(link,
342 link->smcibdev->mac[link->ibport - 1],
343 gid, SMC_LLC_RESP);
344 if (rc < 0)
345 return SMC_CLC_DECL_TCL;
346
347 return rc;
348 }
349
350 static void smc_conn_save_peer_info(struct smc_sock *smc,
351 struct smc_clc_msg_accept_confirm *clc)
352 {
353 smc->conn.peer_conn_idx = clc->conn_idx;
354 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
355 smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
356 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
357 }
358
359 static void smc_link_save_peer_info(struct smc_link *link,
360 struct smc_clc_msg_accept_confirm *clc)
361 {
362 link->peer_qpn = ntoh24(clc->qpn);
363 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
364 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
365 link->peer_psn = ntoh24(clc->psn);
366 link->peer_mtu = clc->qp_mtu;
367 }
368
369 /* setup for RDMA connection of client */
370 static int smc_connect_rdma(struct smc_sock *smc)
371 {
372 struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr;
373 struct smc_clc_msg_accept_confirm aclc;
374 int local_contact = SMC_FIRST_CONTACT;
375 struct smc_ib_device *smcibdev;
376 struct smc_link *link;
377 u8 srv_first_contact;
378 int reason_code = 0;
379 int rc = 0;
380 u8 ibport;
381
382 /* IPSec connections opt out of SMC-R optimizations */
383 if (using_ipsec(smc)) {
384 reason_code = SMC_CLC_DECL_IPSEC;
385 goto decline_rdma;
386 }
387
388 /* PNET table look up: search active ib_device and port
389 * within same PNETID that also contains the ethernet device
390 * used for the internal TCP socket
391 */
392 smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
393 if (!smcibdev) {
394 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
395 goto decline_rdma;
396 }
397
398 /* do inband token exchange */
399 reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
400 if (reason_code < 0) {
401 rc = reason_code;
402 goto out_err;
403 }
404 if (reason_code > 0) /* configuration error */
405 goto decline_rdma;
406 /* receive SMC Accept CLC message */
407 reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
408 SMC_CLC_ACCEPT);
409 if (reason_code < 0) {
410 rc = reason_code;
411 goto out_err;
412 }
413 if (reason_code > 0)
414 goto decline_rdma;
415
416 srv_first_contact = aclc.hdr.flag;
417 mutex_lock(&smc_create_lgr_pending);
418 local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev,
419 ibport, &aclc.lcl, srv_first_contact);
420 if (local_contact < 0) {
421 rc = local_contact;
422 if (rc == -ENOMEM)
423 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
424 else if (rc == -ENOLINK)
425 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
426 goto decline_rdma_unlock;
427 }
428 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
429
430 smc_conn_save_peer_info(smc, &aclc);
431
432 rc = smc_sndbuf_create(smc);
433 if (rc) {
434 reason_code = SMC_CLC_DECL_MEM;
435 goto decline_rdma_unlock;
436 }
437 rc = smc_rmb_create(smc);
438 if (rc) {
439 reason_code = SMC_CLC_DECL_MEM;
440 goto decline_rdma_unlock;
441 }
442
443 if (local_contact == SMC_FIRST_CONTACT)
444 smc_link_save_peer_info(link, &aclc);
445
446 rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
447 if (rc) {
448 reason_code = SMC_CLC_DECL_INTERR;
449 goto decline_rdma_unlock;
450 }
451
452 if (local_contact == SMC_FIRST_CONTACT) {
453 rc = smc_ib_ready_link(link);
454 if (rc) {
455 reason_code = SMC_CLC_DECL_INTERR;
456 goto decline_rdma_unlock;
457 }
458 }
459
460 rc = smc_clc_send_confirm(smc);
461 if (rc)
462 goto out_err_unlock;
463
464 if (local_contact == SMC_FIRST_CONTACT) {
465 /* QP confirmation over RoCE fabric */
466 reason_code = smc_clnt_conf_first_link(
467 smc, &smcibdev->gid[ibport - 1]);
468 if (reason_code < 0) {
469 rc = reason_code;
470 goto out_err_unlock;
471 }
472 if (reason_code > 0)
473 goto decline_rdma_unlock;
474 }
475
476 mutex_unlock(&smc_create_lgr_pending);
477 smc_tx_init(smc);
478 smc_rx_init(smc);
479
480 out_connected:
481 smc_copy_sock_settings_to_clc(smc);
482 if (smc->sk.sk_state == SMC_INIT)
483 smc->sk.sk_state = SMC_ACTIVE;
484
485 return rc ? rc : local_contact;
486
487 decline_rdma_unlock:
488 mutex_unlock(&smc_create_lgr_pending);
489 smc_conn_free(&smc->conn);
490 decline_rdma:
491 /* RDMA setup failed, switch back to TCP */
492 smc->use_fallback = true;
493 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
494 rc = smc_clc_send_decline(smc, reason_code, 0);
495 if (rc < sizeof(struct smc_clc_msg_decline))
496 goto out_err;
497 }
498 goto out_connected;
499
500 out_err_unlock:
501 mutex_unlock(&smc_create_lgr_pending);
502 smc_conn_free(&smc->conn);
503 out_err:
504 return rc;
505 }
506
507 static int smc_connect(struct socket *sock, struct sockaddr *addr,
508 int alen, int flags)
509 {
510 struct sock *sk = sock->sk;
511 struct smc_sock *smc;
512 int rc = -EINVAL;
513
514 smc = smc_sk(sk);
515
516 /* separate smc parameter checking to be safe */
517 if (alen < sizeof(addr->sa_family))
518 goto out_err;
519 if (addr->sa_family != AF_INET)
520 goto out_err;
521 smc->addr = addr; /* needed for nonblocking connect */
522
523 lock_sock(sk);
524 switch (sk->sk_state) {
525 default:
526 goto out;
527 case SMC_ACTIVE:
528 rc = -EISCONN;
529 goto out;
530 case SMC_INIT:
531 rc = 0;
532 break;
533 }
534
535 smc_copy_sock_settings_to_clc(smc);
536 rc = kernel_connect(smc->clcsock, addr, alen, flags);
537 if (rc)
538 goto out;
539
540 /* setup RDMA connection */
541 rc = smc_connect_rdma(smc);
542 if (rc < 0)
543 goto out;
544 else
545 rc = 0; /* success cases including fallback */
546
547 out:
548 release_sock(sk);
549 out_err:
550 return rc;
551 }
552
553 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
554 {
555 struct sock *sk = &lsmc->sk;
556 struct socket *new_clcsock;
557 struct sock *new_sk;
558 int rc;
559
560 release_sock(&lsmc->sk);
561 new_sk = smc_sock_alloc(sock_net(sk), NULL);
562 if (!new_sk) {
563 rc = -ENOMEM;
564 lsmc->sk.sk_err = ENOMEM;
565 *new_smc = NULL;
566 lock_sock(&lsmc->sk);
567 goto out;
568 }
569 *new_smc = smc_sk(new_sk);
570
571 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
572 lock_sock(&lsmc->sk);
573 if (rc < 0) {
574 lsmc->sk.sk_err = -rc;
575 new_sk->sk_state = SMC_CLOSED;
576 sock_set_flag(new_sk, SOCK_DEAD);
577 sk->sk_prot->unhash(new_sk);
578 sock_put(new_sk);
579 *new_smc = NULL;
580 goto out;
581 }
582 if (lsmc->sk.sk_state == SMC_CLOSED) {
583 if (new_clcsock)
584 sock_release(new_clcsock);
585 new_sk->sk_state = SMC_CLOSED;
586 sock_set_flag(new_sk, SOCK_DEAD);
587 sk->sk_prot->unhash(new_sk);
588 sock_put(new_sk);
589 *new_smc = NULL;
590 goto out;
591 }
592
593 (*new_smc)->clcsock = new_clcsock;
594 out:
595 return rc;
596 }
597
598 /* add a just created sock to the accept queue of the listen sock as
599 * candidate for a following socket accept call from user space
600 */
601 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
602 {
603 struct smc_sock *par = smc_sk(parent);
604
605 sock_hold(sk);
606 spin_lock(&par->accept_q_lock);
607 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
608 spin_unlock(&par->accept_q_lock);
609 sk_acceptq_added(parent);
610 }
611
612 /* remove a socket from the accept queue of its parental listening socket */
613 static void smc_accept_unlink(struct sock *sk)
614 {
615 struct smc_sock *par = smc_sk(sk)->listen_smc;
616
617 spin_lock(&par->accept_q_lock);
618 list_del_init(&smc_sk(sk)->accept_q);
619 spin_unlock(&par->accept_q_lock);
620 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
621 sock_put(sk);
622 }
623
624 /* remove a sock from the accept queue to bind it to a new socket created
625 * for a socket accept call from user space
626 */
627 struct sock *smc_accept_dequeue(struct sock *parent,
628 struct socket *new_sock)
629 {
630 struct smc_sock *isk, *n;
631 struct sock *new_sk;
632
633 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
634 new_sk = (struct sock *)isk;
635
636 smc_accept_unlink(new_sk);
637 if (new_sk->sk_state == SMC_CLOSED) {
638 /* tbd in follow-on patch: close this sock */
639 continue;
640 }
641 if (new_sock)
642 sock_graft(new_sk, new_sock);
643 return new_sk;
644 }
645 return NULL;
646 }
647
648 /* clean up for a created but never accepted sock */
649 void smc_close_non_accepted(struct sock *sk)
650 {
651 struct smc_sock *smc = smc_sk(sk);
652
653 sock_hold(sk);
654 lock_sock(sk);
655 if (!sk->sk_lingertime)
656 /* wait for peer closing */
657 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
658 if (!smc->use_fallback)
659 smc_close_active(smc);
660 if (smc->clcsock) {
661 struct socket *tcp;
662
663 tcp = smc->clcsock;
664 smc->clcsock = NULL;
665 sock_release(tcp);
666 }
667 sock_set_flag(sk, SOCK_DEAD);
668 sk->sk_shutdown |= SHUTDOWN_MASK;
669 if (smc->use_fallback) {
670 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
671 } else {
672 smc_conn_free(&smc->conn);
673 schedule_delayed_work(&smc->sock_put_work,
674 SMC_CLOSE_SOCK_PUT_DELAY);
675 }
676 release_sock(sk);
677 sock_put(sk);
678 }
679
680 static int smc_serv_conf_first_link(struct smc_sock *smc)
681 {
682 struct smc_link_group *lgr = smc->conn.lgr;
683 struct smc_link *link;
684 int rest;
685 int rc;
686
687 link = &lgr->lnk[SMC_SINGLE_LINK];
688 /* send CONFIRM LINK request to client over the RoCE fabric */
689 rc = smc_llc_send_confirm_link(link,
690 link->smcibdev->mac[link->ibport - 1],
691 &link->smcibdev->gid[link->ibport - 1],
692 SMC_LLC_REQ);
693 if (rc < 0)
694 return SMC_CLC_DECL_TCL;
695
696 /* receive CONFIRM LINK response from client over the RoCE fabric */
697 rest = wait_for_completion_interruptible_timeout(
698 &link->llc_confirm_resp,
699 SMC_LLC_WAIT_FIRST_TIME);
700 if (rest <= 0) {
701 struct smc_clc_msg_decline dclc;
702
703 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
704 SMC_CLC_DECLINE);
705 }
706
707 return rc;
708 }
709
710 /* setup for RDMA connection of server */
711 static void smc_listen_work(struct work_struct *work)
712 {
713 struct smc_sock *new_smc = container_of(work, struct smc_sock,
714 smc_listen_work);
715 struct socket *newclcsock = new_smc->clcsock;
716 struct smc_sock *lsmc = new_smc->listen_smc;
717 struct smc_clc_msg_accept_confirm cclc;
718 int local_contact = SMC_REUSE_CONTACT;
719 struct sock *newsmcsk = &new_smc->sk;
720 struct smc_clc_msg_proposal pclc;
721 struct smc_ib_device *smcibdev;
722 struct sockaddr_in peeraddr;
723 struct smc_link *link;
724 int reason_code = 0;
725 int rc = 0, len;
726 __be32 subnet;
727 u8 prefix_len;
728 u8 ibport;
729
730 /* do inband token exchange -
731 *wait for and receive SMC Proposal CLC message
732 */
733 reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc),
734 SMC_CLC_PROPOSAL);
735 if (reason_code < 0)
736 goto out_err;
737 if (reason_code > 0)
738 goto decline_rdma;
739
740 /* IPSec connections opt out of SMC-R optimizations */
741 if (using_ipsec(new_smc)) {
742 reason_code = SMC_CLC_DECL_IPSEC;
743 goto decline_rdma;
744 }
745
746 /* PNET table look up: search active ib_device and port
747 * within same PNETID that also contains the ethernet device
748 * used for the internal TCP socket
749 */
750 smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
751 if (!smcibdev) {
752 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
753 goto decline_rdma;
754 }
755
756 /* determine subnet and mask from internal TCP socket */
757 rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len);
758 if (rc) {
759 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
760 goto decline_rdma;
761 }
762 if ((pclc.outgoing_subnet != subnet) ||
763 (pclc.prefix_len != prefix_len)) {
764 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
765 goto decline_rdma;
766 }
767
768 /* get address of the peer connected to the internal TCP socket */
769 kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len);
770
771 /* allocate connection / link group */
772 mutex_lock(&smc_create_lgr_pending);
773 local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
774 smcibdev, ibport, &pclc.lcl, 0);
775 if (local_contact == SMC_REUSE_CONTACT)
776 /* lock no longer needed, free it due to following
777 * smc_clc_wait_msg() call
778 */
779 mutex_unlock(&smc_create_lgr_pending);
780 if (local_contact < 0) {
781 rc = local_contact;
782 if (rc == -ENOMEM)
783 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
784 else if (rc == -ENOLINK)
785 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
786 goto decline_rdma;
787 }
788 link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
789
790 rc = smc_sndbuf_create(new_smc);
791 if (rc) {
792 reason_code = SMC_CLC_DECL_MEM;
793 goto decline_rdma;
794 }
795 rc = smc_rmb_create(new_smc);
796 if (rc) {
797 reason_code = SMC_CLC_DECL_MEM;
798 goto decline_rdma;
799 }
800
801 rc = smc_clc_send_accept(new_smc, local_contact);
802 if (rc)
803 goto out_err;
804
805 /* receive SMC Confirm CLC message */
806 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
807 SMC_CLC_CONFIRM);
808 if (reason_code < 0)
809 goto out_err;
810 if (reason_code > 0)
811 goto decline_rdma;
812 smc_conn_save_peer_info(new_smc, &cclc);
813 if (local_contact == SMC_FIRST_CONTACT)
814 smc_link_save_peer_info(link, &cclc);
815
816 rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
817 if (rc) {
818 reason_code = SMC_CLC_DECL_INTERR;
819 goto decline_rdma;
820 }
821
822 if (local_contact == SMC_FIRST_CONTACT) {
823 rc = smc_ib_ready_link(link);
824 if (rc) {
825 reason_code = SMC_CLC_DECL_INTERR;
826 goto decline_rdma;
827 }
828 /* QP confirmation over RoCE fabric */
829 reason_code = smc_serv_conf_first_link(new_smc);
830 if (reason_code < 0) {
831 /* peer is not aware of a problem */
832 rc = reason_code;
833 goto out_err;
834 }
835 if (reason_code > 0)
836 goto decline_rdma;
837 }
838
839 smc_tx_init(new_smc);
840 smc_rx_init(new_smc);
841
842 out_connected:
843 sk_refcnt_debug_inc(newsmcsk);
844 if (newsmcsk->sk_state == SMC_INIT)
845 newsmcsk->sk_state = SMC_ACTIVE;
846 enqueue:
847 if (local_contact == SMC_FIRST_CONTACT)
848 mutex_unlock(&smc_create_lgr_pending);
849 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
850 if (lsmc->sk.sk_state == SMC_LISTEN) {
851 smc_accept_enqueue(&lsmc->sk, newsmcsk);
852 } else { /* no longer listening */
853 smc_close_non_accepted(newsmcsk);
854 }
855 release_sock(&lsmc->sk);
856
857 /* Wake up accept */
858 lsmc->sk.sk_data_ready(&lsmc->sk);
859 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
860 return;
861
862 decline_rdma:
863 /* RDMA setup failed, switch back to TCP */
864 smc_conn_free(&new_smc->conn);
865 new_smc->use_fallback = true;
866 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
867 rc = smc_clc_send_decline(new_smc, reason_code, 0);
868 if (rc < sizeof(struct smc_clc_msg_decline))
869 goto out_err;
870 }
871 goto out_connected;
872
873 out_err:
874 newsmcsk->sk_state = SMC_CLOSED;
875 smc_conn_free(&new_smc->conn);
876 goto enqueue; /* queue new sock with sk_err set */
877 }
878
879 static void smc_tcp_listen_work(struct work_struct *work)
880 {
881 struct smc_sock *lsmc = container_of(work, struct smc_sock,
882 tcp_listen_work);
883 struct smc_sock *new_smc;
884 int rc = 0;
885
886 lock_sock(&lsmc->sk);
887 while (lsmc->sk.sk_state == SMC_LISTEN) {
888 rc = smc_clcsock_accept(lsmc, &new_smc);
889 if (rc)
890 goto out;
891 if (!new_smc)
892 continue;
893
894 new_smc->listen_smc = lsmc;
895 new_smc->use_fallback = false; /* assume rdma capability first*/
896 sock_hold(&lsmc->sk); /* sock_put in smc_listen_work */
897 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
898 smc_copy_sock_settings_to_smc(new_smc);
899 schedule_work(&new_smc->smc_listen_work);
900 }
901
902 out:
903 release_sock(&lsmc->sk);
904 lsmc->sk.sk_data_ready(&lsmc->sk); /* no more listening, wake accept */
905 }
906
907 static int smc_listen(struct socket *sock, int backlog)
908 {
909 struct sock *sk = sock->sk;
910 struct smc_sock *smc;
911 int rc;
912
913 smc = smc_sk(sk);
914 lock_sock(sk);
915
916 rc = -EINVAL;
917 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
918 goto out;
919
920 rc = 0;
921 if (sk->sk_state == SMC_LISTEN) {
922 sk->sk_max_ack_backlog = backlog;
923 goto out;
924 }
925 /* some socket options are handled in core, so we could not apply
926 * them to the clc socket -- copy smc socket options to clc socket
927 */
928 smc_copy_sock_settings_to_clc(smc);
929
930 rc = kernel_listen(smc->clcsock, backlog);
931 if (rc)
932 goto out;
933 sk->sk_max_ack_backlog = backlog;
934 sk->sk_ack_backlog = 0;
935 sk->sk_state = SMC_LISTEN;
936 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
937 schedule_work(&smc->tcp_listen_work);
938
939 out:
940 release_sock(sk);
941 return rc;
942 }
943
944 static int smc_accept(struct socket *sock, struct socket *new_sock,
945 int flags)
946 {
947 struct sock *sk = sock->sk, *nsk;
948 DECLARE_WAITQUEUE(wait, current);
949 struct smc_sock *lsmc;
950 long timeo;
951 int rc = 0;
952
953 lsmc = smc_sk(sk);
954 lock_sock(sk);
955
956 if (lsmc->sk.sk_state != SMC_LISTEN) {
957 rc = -EINVAL;
958 goto out;
959 }
960
961 /* Wait for an incoming connection */
962 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
963 add_wait_queue_exclusive(sk_sleep(sk), &wait);
964 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
965 set_current_state(TASK_INTERRUPTIBLE);
966 if (!timeo) {
967 rc = -EAGAIN;
968 break;
969 }
970 release_sock(sk);
971 timeo = schedule_timeout(timeo);
972 /* wakeup by sk_data_ready in smc_listen_work() */
973 sched_annotate_sleep();
974 lock_sock(sk);
975 if (signal_pending(current)) {
976 rc = sock_intr_errno(timeo);
977 break;
978 }
979 }
980 set_current_state(TASK_RUNNING);
981 remove_wait_queue(sk_sleep(sk), &wait);
982
983 if (!rc)
984 rc = sock_error(nsk);
985
986 out:
987 release_sock(sk);
988 return rc;
989 }
990
991 static int smc_getname(struct socket *sock, struct sockaddr *addr,
992 int *len, int peer)
993 {
994 struct smc_sock *smc;
995
996 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
997 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
998 return -ENOTCONN;
999
1000 smc = smc_sk(sock->sk);
1001
1002 return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
1003 }
1004
1005 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1006 {
1007 struct sock *sk = sock->sk;
1008 struct smc_sock *smc;
1009 int rc = -EPIPE;
1010
1011 smc = smc_sk(sk);
1012 lock_sock(sk);
1013 if ((sk->sk_state != SMC_ACTIVE) &&
1014 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1015 (sk->sk_state != SMC_INIT))
1016 goto out;
1017 if (smc->use_fallback)
1018 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1019 else
1020 rc = smc_tx_sendmsg(smc, msg, len);
1021 out:
1022 release_sock(sk);
1023 return rc;
1024 }
1025
1026 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1027 int flags)
1028 {
1029 struct sock *sk = sock->sk;
1030 struct smc_sock *smc;
1031 int rc = -ENOTCONN;
1032
1033 smc = smc_sk(sk);
1034 lock_sock(sk);
1035 if ((sk->sk_state == SMC_INIT) ||
1036 (sk->sk_state == SMC_LISTEN) ||
1037 (sk->sk_state == SMC_CLOSED))
1038 goto out;
1039
1040 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1041 rc = 0;
1042 goto out;
1043 }
1044
1045 if (smc->use_fallback)
1046 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1047 else
1048 rc = smc_rx_recvmsg(smc, msg, len, flags);
1049
1050 out:
1051 release_sock(sk);
1052 return rc;
1053 }
1054
1055 static unsigned int smc_accept_poll(struct sock *parent)
1056 {
1057 struct smc_sock *isk;
1058 struct sock *sk;
1059
1060 lock_sock(parent);
1061 list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) {
1062 sk = (struct sock *)isk;
1063
1064 if (sk->sk_state == SMC_ACTIVE) {
1065 release_sock(parent);
1066 return POLLIN | POLLRDNORM;
1067 }
1068 }
1069 release_sock(parent);
1070
1071 return 0;
1072 }
1073
1074 static unsigned int smc_poll(struct file *file, struct socket *sock,
1075 poll_table *wait)
1076 {
1077 struct sock *sk = sock->sk;
1078 unsigned int mask = 0;
1079 struct smc_sock *smc;
1080 int rc;
1081
1082 smc = smc_sk(sock->sk);
1083 if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
1084 /* delegate to CLC child sock */
1085 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1086 /* if non-blocking connect finished ... */
1087 lock_sock(sk);
1088 if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) {
1089 sk->sk_err = smc->clcsock->sk->sk_err;
1090 if (sk->sk_err) {
1091 mask |= POLLERR;
1092 } else {
1093 rc = smc_connect_rdma(smc);
1094 if (rc < 0)
1095 mask |= POLLERR;
1096 else
1097 /* success cases including fallback */
1098 mask |= POLLOUT | POLLWRNORM;
1099 }
1100 }
1101 release_sock(sk);
1102 } else {
1103 sock_poll_wait(file, sk_sleep(sk), wait);
1104 if (sk->sk_state == SMC_LISTEN)
1105 /* woken up by sk_data_ready in smc_listen_work() */
1106 mask |= smc_accept_poll(sk);
1107 if (sk->sk_err)
1108 mask |= POLLERR;
1109 if (atomic_read(&smc->conn.sndbuf_space) ||
1110 (sk->sk_shutdown & SEND_SHUTDOWN)) {
1111 mask |= POLLOUT | POLLWRNORM;
1112 } else {
1113 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1114 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1115 }
1116 if (atomic_read(&smc->conn.bytes_to_rcv))
1117 mask |= POLLIN | POLLRDNORM;
1118 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1119 (sk->sk_state == SMC_CLOSED))
1120 mask |= POLLHUP;
1121 if (sk->sk_shutdown & RCV_SHUTDOWN)
1122 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
1123 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1124 mask |= POLLIN;
1125
1126 }
1127
1128 return mask;
1129 }
1130
1131 static int smc_shutdown(struct socket *sock, int how)
1132 {
1133 struct sock *sk = sock->sk;
1134 struct smc_sock *smc;
1135 int rc = -EINVAL;
1136 int rc1 = 0;
1137
1138 smc = smc_sk(sk);
1139
1140 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1141 return rc;
1142
1143 lock_sock(sk);
1144
1145 rc = -ENOTCONN;
1146 if ((sk->sk_state != SMC_LISTEN) &&
1147 (sk->sk_state != SMC_ACTIVE) &&
1148 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1149 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1150 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1151 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1152 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1153 goto out;
1154 if (smc->use_fallback) {
1155 rc = kernel_sock_shutdown(smc->clcsock, how);
1156 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1157 if (sk->sk_shutdown == SHUTDOWN_MASK)
1158 sk->sk_state = SMC_CLOSED;
1159 goto out;
1160 }
1161 switch (how) {
1162 case SHUT_RDWR: /* shutdown in both directions */
1163 rc = smc_close_active(smc);
1164 break;
1165 case SHUT_WR:
1166 rc = smc_close_shutdown_write(smc);
1167 break;
1168 case SHUT_RD:
1169 if (sk->sk_state == SMC_LISTEN)
1170 rc = smc_close_active(smc);
1171 else
1172 rc = 0;
1173 /* nothing more to do because peer is not involved */
1174 break;
1175 }
1176 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1177 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1178 sk->sk_shutdown |= how + 1;
1179
1180 out:
1181 release_sock(sk);
1182 return rc ? rc : rc1;
1183 }
1184
1185 static int smc_setsockopt(struct socket *sock, int level, int optname,
1186 char __user *optval, unsigned int optlen)
1187 {
1188 struct sock *sk = sock->sk;
1189 struct smc_sock *smc;
1190
1191 smc = smc_sk(sk);
1192
1193 /* generic setsockopts reaching us here always apply to the
1194 * CLC socket
1195 */
1196 return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1197 optval, optlen);
1198 }
1199
1200 static int smc_getsockopt(struct socket *sock, int level, int optname,
1201 char __user *optval, int __user *optlen)
1202 {
1203 struct smc_sock *smc;
1204
1205 smc = smc_sk(sock->sk);
1206 /* socket options apply to the CLC socket */
1207 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1208 optval, optlen);
1209 }
1210
1211 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1212 unsigned long arg)
1213 {
1214 struct smc_sock *smc;
1215
1216 smc = smc_sk(sock->sk);
1217 if (smc->use_fallback)
1218 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1219 else
1220 return sock_no_ioctl(sock, cmd, arg);
1221 }
1222
1223 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1224 int offset, size_t size, int flags)
1225 {
1226 struct sock *sk = sock->sk;
1227 struct smc_sock *smc;
1228 int rc = -EPIPE;
1229
1230 smc = smc_sk(sk);
1231 lock_sock(sk);
1232 if (sk->sk_state != SMC_ACTIVE)
1233 goto out;
1234 if (smc->use_fallback)
1235 rc = kernel_sendpage(smc->clcsock, page, offset,
1236 size, flags);
1237 else
1238 rc = sock_no_sendpage(sock, page, offset, size, flags);
1239
1240 out:
1241 release_sock(sk);
1242 return rc;
1243 }
1244
1245 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1246 struct pipe_inode_info *pipe, size_t len,
1247 unsigned int flags)
1248 {
1249 struct sock *sk = sock->sk;
1250 struct smc_sock *smc;
1251 int rc = -ENOTCONN;
1252
1253 smc = smc_sk(sk);
1254 lock_sock(sk);
1255 if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
1256 goto out;
1257 if (smc->use_fallback) {
1258 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1259 pipe, len, flags);
1260 } else {
1261 rc = -EOPNOTSUPP;
1262 }
1263 out:
1264 release_sock(sk);
1265 return rc;
1266 }
1267
1268 /* must look like tcp */
1269 static const struct proto_ops smc_sock_ops = {
1270 .family = PF_SMC,
1271 .owner = THIS_MODULE,
1272 .release = smc_release,
1273 .bind = smc_bind,
1274 .connect = smc_connect,
1275 .socketpair = sock_no_socketpair,
1276 .accept = smc_accept,
1277 .getname = smc_getname,
1278 .poll = smc_poll,
1279 .ioctl = smc_ioctl,
1280 .listen = smc_listen,
1281 .shutdown = smc_shutdown,
1282 .setsockopt = smc_setsockopt,
1283 .getsockopt = smc_getsockopt,
1284 .sendmsg = smc_sendmsg,
1285 .recvmsg = smc_recvmsg,
1286 .mmap = sock_no_mmap,
1287 .sendpage = smc_sendpage,
1288 .splice_read = smc_splice_read,
1289 };
1290
1291 static int smc_create(struct net *net, struct socket *sock, int protocol,
1292 int kern)
1293 {
1294 struct smc_sock *smc;
1295 struct sock *sk;
1296 int rc;
1297
1298 rc = -ESOCKTNOSUPPORT;
1299 if (sock->type != SOCK_STREAM)
1300 goto out;
1301
1302 rc = -EPROTONOSUPPORT;
1303 if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
1304 goto out;
1305
1306 rc = -ENOBUFS;
1307 sock->ops = &smc_sock_ops;
1308 sk = smc_sock_alloc(net, sock);
1309 if (!sk)
1310 goto out;
1311
1312 /* create internal TCP socket for CLC handshake and fallback */
1313 smc = smc_sk(sk);
1314 smc->use_fallback = false; /* assume rdma capability first */
1315 rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
1316 IPPROTO_TCP, &smc->clcsock);
1317 if (rc)
1318 sk_common_release(sk);
1319 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1320 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1321
1322 out:
1323 return rc;
1324 }
1325
1326 static const struct net_proto_family smc_sock_family_ops = {
1327 .family = PF_SMC,
1328 .owner = THIS_MODULE,
1329 .create = smc_create,
1330 };
1331
1332 static int __init smc_init(void)
1333 {
1334 int rc;
1335
1336 rc = smc_pnet_init();
1337 if (rc)
1338 return rc;
1339
1340 rc = smc_llc_init();
1341 if (rc) {
1342 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1343 goto out_pnet;
1344 }
1345
1346 rc = smc_cdc_init();
1347 if (rc) {
1348 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1349 goto out_pnet;
1350 }
1351
1352 rc = proto_register(&smc_proto, 1);
1353 if (rc) {
1354 pr_err("%s: proto_register fails with %d\n", __func__, rc);
1355 goto out_pnet;
1356 }
1357
1358 rc = sock_register(&smc_sock_family_ops);
1359 if (rc) {
1360 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1361 goto out_proto;
1362 }
1363 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1364
1365 rc = smc_ib_register_client();
1366 if (rc) {
1367 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1368 goto out_sock;
1369 }
1370
1371 return 0;
1372
1373 out_sock:
1374 sock_unregister(PF_SMC);
1375 out_proto:
1376 proto_unregister(&smc_proto);
1377 out_pnet:
1378 smc_pnet_exit();
1379 return rc;
1380 }
1381
1382 static void __exit smc_exit(void)
1383 {
1384 struct smc_link_group *lgr, *lg;
1385 LIST_HEAD(lgr_freeing_list);
1386
1387 spin_lock_bh(&smc_lgr_list.lock);
1388 if (!list_empty(&smc_lgr_list.list))
1389 list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1390 spin_unlock_bh(&smc_lgr_list.lock);
1391 list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1392 list_del_init(&lgr->list);
1393 smc_lgr_free(lgr); /* free link group */
1394 }
1395 smc_ib_unregister_client();
1396 sock_unregister(PF_SMC);
1397 proto_unregister(&smc_proto);
1398 smc_pnet_exit();
1399 }
1400
1401 module_init(smc_init);
1402 module_exit(smc_exit);
1403
1404 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
1405 MODULE_DESCRIPTION("smc socket address family");
1406 MODULE_LICENSE("GPL");
1407 MODULE_ALIAS_NETPROTO(PF_SMC);
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