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[mirror_ubuntu-bionic-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 <linux/sched/signal.h>
31
32 #include <net/sock.h>
33 #include <net/tcp.h>
34 #include <net/smc.h>
35
36 #include "smc.h"
37 #include "smc_clc.h"
38 #include "smc_llc.h"
39 #include "smc_cdc.h"
40 #include "smc_core.h"
41 #include "smc_ib.h"
42 #include "smc_pnet.h"
43 #include "smc_tx.h"
44 #include "smc_rx.h"
45 #include "smc_close.h"
46
47 static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
48 * creation
49 */
50
51 struct smc_lgr_list smc_lgr_list = { /* established link groups */
52 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
53 .list = LIST_HEAD_INIT(smc_lgr_list.list),
54 };
55
56 static void smc_tcp_listen_work(struct work_struct *);
57
58 static void smc_set_keepalive(struct sock *sk, int val)
59 {
60 struct smc_sock *smc = smc_sk(sk);
61
62 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
63 }
64
65 static struct smc_hashinfo smc_v4_hashinfo = {
66 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
67 };
68
69 int smc_hash_sk(struct sock *sk)
70 {
71 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
72 struct hlist_head *head;
73
74 head = &h->ht;
75
76 write_lock_bh(&h->lock);
77 sk_add_node(sk, head);
78 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
79 write_unlock_bh(&h->lock);
80
81 return 0;
82 }
83 EXPORT_SYMBOL_GPL(smc_hash_sk);
84
85 void smc_unhash_sk(struct sock *sk)
86 {
87 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
88
89 write_lock_bh(&h->lock);
90 if (sk_del_node_init(sk))
91 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
92 write_unlock_bh(&h->lock);
93 }
94 EXPORT_SYMBOL_GPL(smc_unhash_sk);
95
96 struct proto smc_proto = {
97 .name = "SMC",
98 .owner = THIS_MODULE,
99 .keepalive = smc_set_keepalive,
100 .hash = smc_hash_sk,
101 .unhash = smc_unhash_sk,
102 .obj_size = sizeof(struct smc_sock),
103 .h.smc_hash = &smc_v4_hashinfo,
104 .slab_flags = SLAB_DESTROY_BY_RCU,
105 };
106 EXPORT_SYMBOL_GPL(smc_proto);
107
108 static int smc_release(struct socket *sock)
109 {
110 struct sock *sk = sock->sk;
111 struct smc_sock *smc;
112 int rc = 0;
113
114 if (!sk)
115 goto out;
116
117 smc = smc_sk(sk);
118 sock_hold(sk);
119 if (sk->sk_state == SMC_LISTEN)
120 /* smc_close_non_accepted() is called and acquires
121 * sock lock for child sockets again
122 */
123 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
124 else
125 lock_sock(sk);
126
127 if (smc->use_fallback) {
128 sk->sk_state = SMC_CLOSED;
129 sk->sk_state_change(sk);
130 } else {
131 rc = smc_close_active(smc);
132 sock_set_flag(sk, SOCK_DEAD);
133 sk->sk_shutdown |= SHUTDOWN_MASK;
134 }
135 if (smc->clcsock) {
136 sock_release(smc->clcsock);
137 smc->clcsock = NULL;
138 }
139
140 /* detach socket */
141 sock_orphan(sk);
142 sock->sk = NULL;
143 if (smc->use_fallback) {
144 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
145 } else if (sk->sk_state == SMC_CLOSED) {
146 smc_conn_free(&smc->conn);
147 schedule_delayed_work(&smc->sock_put_work,
148 SMC_CLOSE_SOCK_PUT_DELAY);
149 }
150 sk->sk_prot->unhash(sk);
151 release_sock(sk);
152
153 sock_put(sk);
154 out:
155 return rc;
156 }
157
158 static void smc_destruct(struct sock *sk)
159 {
160 if (sk->sk_state != SMC_CLOSED)
161 return;
162 if (!sock_flag(sk, SOCK_DEAD))
163 return;
164
165 sk_refcnt_debug_dec(sk);
166 }
167
168 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
169 {
170 struct smc_sock *smc;
171 struct sock *sk;
172
173 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
174 if (!sk)
175 return NULL;
176
177 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
178 sk->sk_state = SMC_INIT;
179 sk->sk_destruct = smc_destruct;
180 sk->sk_protocol = SMCPROTO_SMC;
181 smc = smc_sk(sk);
182 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
183 INIT_LIST_HEAD(&smc->accept_q);
184 spin_lock_init(&smc->accept_q_lock);
185 INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work);
186 sk->sk_prot->hash(sk);
187 sk_refcnt_debug_inc(sk);
188
189 return sk;
190 }
191
192 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
193 int addr_len)
194 {
195 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
196 struct sock *sk = sock->sk;
197 struct smc_sock *smc;
198 int rc;
199
200 smc = smc_sk(sk);
201
202 /* replicate tests from inet_bind(), to be safe wrt. future changes */
203 rc = -EINVAL;
204 if (addr_len < sizeof(struct sockaddr_in))
205 goto out;
206
207 rc = -EAFNOSUPPORT;
208 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
209 if ((addr->sin_family != AF_INET) &&
210 ((addr->sin_family != AF_UNSPEC) ||
211 (addr->sin_addr.s_addr != htonl(INADDR_ANY))))
212 goto out;
213
214 lock_sock(sk);
215
216 /* Check if socket is already active */
217 rc = -EINVAL;
218 if (sk->sk_state != SMC_INIT)
219 goto out_rel;
220
221 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
222 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
223
224 out_rel:
225 release_sock(sk);
226 out:
227 return rc;
228 }
229
230 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
231 unsigned long mask)
232 {
233 /* options we don't get control via setsockopt for */
234 nsk->sk_type = osk->sk_type;
235 nsk->sk_sndbuf = osk->sk_sndbuf;
236 nsk->sk_rcvbuf = osk->sk_rcvbuf;
237 nsk->sk_sndtimeo = osk->sk_sndtimeo;
238 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
239 nsk->sk_mark = osk->sk_mark;
240 nsk->sk_priority = osk->sk_priority;
241 nsk->sk_rcvlowat = osk->sk_rcvlowat;
242 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
243 nsk->sk_err = osk->sk_err;
244
245 nsk->sk_flags &= ~mask;
246 nsk->sk_flags |= osk->sk_flags & mask;
247 }
248
249 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
250 (1UL << SOCK_KEEPOPEN) | \
251 (1UL << SOCK_LINGER) | \
252 (1UL << SOCK_BROADCAST) | \
253 (1UL << SOCK_TIMESTAMP) | \
254 (1UL << SOCK_DBG) | \
255 (1UL << SOCK_RCVTSTAMP) | \
256 (1UL << SOCK_RCVTSTAMPNS) | \
257 (1UL << SOCK_LOCALROUTE) | \
258 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
259 (1UL << SOCK_RXQ_OVFL) | \
260 (1UL << SOCK_WIFI_STATUS) | \
261 (1UL << SOCK_NOFCS) | \
262 (1UL << SOCK_FILTER_LOCKED))
263 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
264 * clc socket (since smc is not called for these options from net/core)
265 */
266 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
267 {
268 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
269 }
270
271 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
272 (1UL << SOCK_KEEPOPEN) | \
273 (1UL << SOCK_LINGER) | \
274 (1UL << SOCK_DBG))
275 /* copy only settings and flags relevant for smc from clc to smc socket */
276 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
277 {
278 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
279 }
280
281 /* determine subnet and mask of internal TCP socket */
282 int smc_netinfo_by_tcpsk(struct socket *clcsock,
283 __be32 *subnet, u8 *prefix_len)
284 {
285 struct dst_entry *dst = sk_dst_get(clcsock->sk);
286 struct sockaddr_in addr;
287 int rc = -ENOENT;
288 int len;
289
290 if (!dst) {
291 rc = -ENOTCONN;
292 goto out;
293 }
294 if (!dst->dev) {
295 rc = -ENODEV;
296 goto out_rel;
297 }
298
299 /* get address to which the internal TCP socket is bound */
300 kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len);
301 /* analyze IPv4 specific data of net_device belonging to TCP socket */
302 for_ifa(dst->dev->ip_ptr) {
303 if (ifa->ifa_address != addr.sin_addr.s_addr)
304 continue;
305 *prefix_len = inet_mask_len(ifa->ifa_mask);
306 *subnet = ifa->ifa_address & ifa->ifa_mask;
307 rc = 0;
308 break;
309 } endfor_ifa(dst->dev->ip_ptr);
310
311 out_rel:
312 dst_release(dst);
313 out:
314 return rc;
315 }
316
317 static int smc_clnt_conf_first_link(struct smc_sock *smc, union ib_gid *gid)
318 {
319 struct smc_link_group *lgr = smc->conn.lgr;
320 struct smc_link *link;
321 int rest;
322 int rc;
323
324 link = &lgr->lnk[SMC_SINGLE_LINK];
325 /* receive CONFIRM LINK request from server over RoCE fabric */
326 rest = wait_for_completion_interruptible_timeout(
327 &link->llc_confirm,
328 SMC_LLC_WAIT_FIRST_TIME);
329 if (rest <= 0) {
330 struct smc_clc_msg_decline dclc;
331
332 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
333 SMC_CLC_DECLINE);
334 return rc;
335 }
336
337 rc = smc_ib_modify_qp_rts(link);
338 if (rc)
339 return SMC_CLC_DECL_INTERR;
340
341 smc_wr_remember_qp_attr(link);
342 /* send CONFIRM LINK response over RoCE fabric */
343 rc = smc_llc_send_confirm_link(link,
344 link->smcibdev->mac[link->ibport - 1],
345 gid, SMC_LLC_RESP);
346 if (rc < 0)
347 return SMC_CLC_DECL_TCL;
348
349 return rc;
350 }
351
352 static void smc_conn_save_peer_info(struct smc_sock *smc,
353 struct smc_clc_msg_accept_confirm *clc)
354 {
355 smc->conn.peer_conn_idx = clc->conn_idx;
356 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
357 smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
358 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
359 }
360
361 static void smc_link_save_peer_info(struct smc_link *link,
362 struct smc_clc_msg_accept_confirm *clc)
363 {
364 link->peer_qpn = ntoh24(clc->qpn);
365 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
366 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
367 link->peer_psn = ntoh24(clc->psn);
368 link->peer_mtu = clc->qp_mtu;
369 }
370
371 /* setup for RDMA connection of client */
372 static int smc_connect_rdma(struct smc_sock *smc)
373 {
374 struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr;
375 struct smc_clc_msg_accept_confirm aclc;
376 int local_contact = SMC_FIRST_CONTACT;
377 struct smc_ib_device *smcibdev;
378 struct smc_link *link;
379 u8 srv_first_contact;
380 int reason_code = 0;
381 int rc = 0;
382 u8 ibport;
383
384 /* IPSec connections opt out of SMC-R optimizations */
385 if (using_ipsec(smc)) {
386 reason_code = SMC_CLC_DECL_IPSEC;
387 goto decline_rdma;
388 }
389
390 /* PNET table look up: search active ib_device and port
391 * within same PNETID that also contains the ethernet device
392 * used for the internal TCP socket
393 */
394 smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
395 if (!smcibdev) {
396 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
397 goto decline_rdma;
398 }
399
400 /* do inband token exchange */
401 reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
402 if (reason_code < 0) {
403 rc = reason_code;
404 goto out_err;
405 }
406 if (reason_code > 0) /* configuration error */
407 goto decline_rdma;
408 /* receive SMC Accept CLC message */
409 reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
410 SMC_CLC_ACCEPT);
411 if (reason_code < 0) {
412 rc = reason_code;
413 goto out_err;
414 }
415 if (reason_code > 0)
416 goto decline_rdma;
417
418 srv_first_contact = aclc.hdr.flag;
419 mutex_lock(&smc_create_lgr_pending);
420 local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev,
421 ibport, &aclc.lcl, srv_first_contact);
422 if (local_contact < 0) {
423 rc = local_contact;
424 if (rc == -ENOMEM)
425 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
426 else if (rc == -ENOLINK)
427 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
428 goto decline_rdma_unlock;
429 }
430 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
431
432 smc_conn_save_peer_info(smc, &aclc);
433
434 rc = smc_sndbuf_create(smc);
435 if (rc) {
436 reason_code = SMC_CLC_DECL_MEM;
437 goto decline_rdma_unlock;
438 }
439 rc = smc_rmb_create(smc);
440 if (rc) {
441 reason_code = SMC_CLC_DECL_MEM;
442 goto decline_rdma_unlock;
443 }
444
445 if (local_contact == SMC_FIRST_CONTACT)
446 smc_link_save_peer_info(link, &aclc);
447
448 rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
449 if (rc) {
450 reason_code = SMC_CLC_DECL_INTERR;
451 goto decline_rdma_unlock;
452 }
453
454 if (local_contact == SMC_FIRST_CONTACT) {
455 rc = smc_ib_ready_link(link);
456 if (rc) {
457 reason_code = SMC_CLC_DECL_INTERR;
458 goto decline_rdma_unlock;
459 }
460 }
461
462 rc = smc_clc_send_confirm(smc);
463 if (rc)
464 goto out_err_unlock;
465
466 if (local_contact == SMC_FIRST_CONTACT) {
467 /* QP confirmation over RoCE fabric */
468 reason_code = smc_clnt_conf_first_link(
469 smc, &smcibdev->gid[ibport - 1]);
470 if (reason_code < 0) {
471 rc = reason_code;
472 goto out_err_unlock;
473 }
474 if (reason_code > 0)
475 goto decline_rdma_unlock;
476 }
477
478 mutex_unlock(&smc_create_lgr_pending);
479 smc_tx_init(smc);
480 smc_rx_init(smc);
481
482 out_connected:
483 smc_copy_sock_settings_to_clc(smc);
484 if (smc->sk.sk_state == SMC_INIT)
485 smc->sk.sk_state = SMC_ACTIVE;
486
487 return rc ? rc : local_contact;
488
489 decline_rdma_unlock:
490 mutex_unlock(&smc_create_lgr_pending);
491 smc_conn_free(&smc->conn);
492 decline_rdma:
493 /* RDMA setup failed, switch back to TCP */
494 smc->use_fallback = true;
495 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
496 rc = smc_clc_send_decline(smc, reason_code, 0);
497 if (rc < sizeof(struct smc_clc_msg_decline))
498 goto out_err;
499 }
500 goto out_connected;
501
502 out_err_unlock:
503 mutex_unlock(&smc_create_lgr_pending);
504 smc_conn_free(&smc->conn);
505 out_err:
506 return rc;
507 }
508
509 static int smc_connect(struct socket *sock, struct sockaddr *addr,
510 int alen, int flags)
511 {
512 struct sock *sk = sock->sk;
513 struct smc_sock *smc;
514 int rc = -EINVAL;
515
516 smc = smc_sk(sk);
517
518 /* separate smc parameter checking to be safe */
519 if (alen < sizeof(addr->sa_family))
520 goto out_err;
521 if (addr->sa_family != AF_INET)
522 goto out_err;
523 smc->addr = addr; /* needed for nonblocking connect */
524
525 lock_sock(sk);
526 switch (sk->sk_state) {
527 default:
528 goto out;
529 case SMC_ACTIVE:
530 rc = -EISCONN;
531 goto out;
532 case SMC_INIT:
533 rc = 0;
534 break;
535 }
536
537 smc_copy_sock_settings_to_clc(smc);
538 rc = kernel_connect(smc->clcsock, addr, alen, flags);
539 if (rc)
540 goto out;
541
542 /* setup RDMA connection */
543 rc = smc_connect_rdma(smc);
544 if (rc < 0)
545 goto out;
546 else
547 rc = 0; /* success cases including fallback */
548
549 out:
550 release_sock(sk);
551 out_err:
552 return rc;
553 }
554
555 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
556 {
557 struct sock *sk = &lsmc->sk;
558 struct socket *new_clcsock;
559 struct sock *new_sk;
560 int rc;
561
562 release_sock(&lsmc->sk);
563 new_sk = smc_sock_alloc(sock_net(sk), NULL);
564 if (!new_sk) {
565 rc = -ENOMEM;
566 lsmc->sk.sk_err = ENOMEM;
567 *new_smc = NULL;
568 lock_sock(&lsmc->sk);
569 goto out;
570 }
571 *new_smc = smc_sk(new_sk);
572
573 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
574 lock_sock(&lsmc->sk);
575 if (rc < 0) {
576 lsmc->sk.sk_err = -rc;
577 new_sk->sk_state = SMC_CLOSED;
578 sock_set_flag(new_sk, SOCK_DEAD);
579 sk->sk_prot->unhash(new_sk);
580 sock_put(new_sk);
581 *new_smc = NULL;
582 goto out;
583 }
584 if (lsmc->sk.sk_state == SMC_CLOSED) {
585 if (new_clcsock)
586 sock_release(new_clcsock);
587 new_sk->sk_state = SMC_CLOSED;
588 sock_set_flag(new_sk, SOCK_DEAD);
589 sk->sk_prot->unhash(new_sk);
590 sock_put(new_sk);
591 *new_smc = NULL;
592 goto out;
593 }
594
595 (*new_smc)->clcsock = new_clcsock;
596 out:
597 return rc;
598 }
599
600 /* add a just created sock to the accept queue of the listen sock as
601 * candidate for a following socket accept call from user space
602 */
603 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
604 {
605 struct smc_sock *par = smc_sk(parent);
606
607 sock_hold(sk);
608 spin_lock(&par->accept_q_lock);
609 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
610 spin_unlock(&par->accept_q_lock);
611 sk_acceptq_added(parent);
612 }
613
614 /* remove a socket from the accept queue of its parental listening socket */
615 static void smc_accept_unlink(struct sock *sk)
616 {
617 struct smc_sock *par = smc_sk(sk)->listen_smc;
618
619 spin_lock(&par->accept_q_lock);
620 list_del_init(&smc_sk(sk)->accept_q);
621 spin_unlock(&par->accept_q_lock);
622 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
623 sock_put(sk);
624 }
625
626 /* remove a sock from the accept queue to bind it to a new socket created
627 * for a socket accept call from user space
628 */
629 struct sock *smc_accept_dequeue(struct sock *parent,
630 struct socket *new_sock)
631 {
632 struct smc_sock *isk, *n;
633 struct sock *new_sk;
634
635 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
636 new_sk = (struct sock *)isk;
637
638 smc_accept_unlink(new_sk);
639 if (new_sk->sk_state == SMC_CLOSED) {
640 /* tbd in follow-on patch: close this sock */
641 continue;
642 }
643 if (new_sock)
644 sock_graft(new_sk, new_sock);
645 return new_sk;
646 }
647 return NULL;
648 }
649
650 /* clean up for a created but never accepted sock */
651 void smc_close_non_accepted(struct sock *sk)
652 {
653 struct smc_sock *smc = smc_sk(sk);
654
655 sock_hold(sk);
656 lock_sock(sk);
657 if (!sk->sk_lingertime)
658 /* wait for peer closing */
659 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
660 if (!smc->use_fallback)
661 smc_close_active(smc);
662 if (smc->clcsock) {
663 struct socket *tcp;
664
665 tcp = smc->clcsock;
666 smc->clcsock = NULL;
667 sock_release(tcp);
668 }
669 sock_set_flag(sk, SOCK_DEAD);
670 sk->sk_shutdown |= SHUTDOWN_MASK;
671 if (smc->use_fallback) {
672 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
673 } else {
674 smc_conn_free(&smc->conn);
675 schedule_delayed_work(&smc->sock_put_work,
676 SMC_CLOSE_SOCK_PUT_DELAY);
677 }
678 release_sock(sk);
679 sock_put(sk);
680 }
681
682 static int smc_serv_conf_first_link(struct smc_sock *smc)
683 {
684 struct smc_link_group *lgr = smc->conn.lgr;
685 struct smc_link *link;
686 int rest;
687 int rc;
688
689 link = &lgr->lnk[SMC_SINGLE_LINK];
690 /* send CONFIRM LINK request to client over the RoCE fabric */
691 rc = smc_llc_send_confirm_link(link,
692 link->smcibdev->mac[link->ibport - 1],
693 &link->smcibdev->gid[link->ibport - 1],
694 SMC_LLC_REQ);
695 if (rc < 0)
696 return SMC_CLC_DECL_TCL;
697
698 /* receive CONFIRM LINK response from client over the RoCE fabric */
699 rest = wait_for_completion_interruptible_timeout(
700 &link->llc_confirm_resp,
701 SMC_LLC_WAIT_FIRST_TIME);
702 if (rest <= 0) {
703 struct smc_clc_msg_decline dclc;
704
705 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
706 SMC_CLC_DECLINE);
707 }
708
709 return rc;
710 }
711
712 /* setup for RDMA connection of server */
713 static void smc_listen_work(struct work_struct *work)
714 {
715 struct smc_sock *new_smc = container_of(work, struct smc_sock,
716 smc_listen_work);
717 struct socket *newclcsock = new_smc->clcsock;
718 struct smc_sock *lsmc = new_smc->listen_smc;
719 struct smc_clc_msg_accept_confirm cclc;
720 int local_contact = SMC_REUSE_CONTACT;
721 struct sock *newsmcsk = &new_smc->sk;
722 struct smc_clc_msg_proposal pclc;
723 struct smc_ib_device *smcibdev;
724 struct sockaddr_in peeraddr;
725 struct smc_link *link;
726 int reason_code = 0;
727 int rc = 0, len;
728 __be32 subnet;
729 u8 prefix_len;
730 u8 ibport;
731
732 /* do inband token exchange -
733 *wait for and receive SMC Proposal CLC message
734 */
735 reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc),
736 SMC_CLC_PROPOSAL);
737 if (reason_code < 0)
738 goto out_err;
739 if (reason_code > 0)
740 goto decline_rdma;
741
742 /* IPSec connections opt out of SMC-R optimizations */
743 if (using_ipsec(new_smc)) {
744 reason_code = SMC_CLC_DECL_IPSEC;
745 goto decline_rdma;
746 }
747
748 /* PNET table look up: search active ib_device and port
749 * within same PNETID that also contains the ethernet device
750 * used for the internal TCP socket
751 */
752 smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
753 if (!smcibdev) {
754 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
755 goto decline_rdma;
756 }
757
758 /* determine subnet and mask from internal TCP socket */
759 rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len);
760 if (rc) {
761 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
762 goto decline_rdma;
763 }
764 if ((pclc.outgoing_subnet != subnet) ||
765 (pclc.prefix_len != prefix_len)) {
766 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
767 goto decline_rdma;
768 }
769
770 /* get address of the peer connected to the internal TCP socket */
771 kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len);
772
773 /* allocate connection / link group */
774 mutex_lock(&smc_create_lgr_pending);
775 local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
776 smcibdev, ibport, &pclc.lcl, 0);
777 if (local_contact == SMC_REUSE_CONTACT)
778 /* lock no longer needed, free it due to following
779 * smc_clc_wait_msg() call
780 */
781 mutex_unlock(&smc_create_lgr_pending);
782 if (local_contact < 0) {
783 rc = local_contact;
784 if (rc == -ENOMEM)
785 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
786 else if (rc == -ENOLINK)
787 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
788 goto decline_rdma;
789 }
790 link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
791
792 rc = smc_sndbuf_create(new_smc);
793 if (rc) {
794 reason_code = SMC_CLC_DECL_MEM;
795 goto decline_rdma;
796 }
797 rc = smc_rmb_create(new_smc);
798 if (rc) {
799 reason_code = SMC_CLC_DECL_MEM;
800 goto decline_rdma;
801 }
802
803 rc = smc_clc_send_accept(new_smc, local_contact);
804 if (rc)
805 goto out_err;
806
807 /* receive SMC Confirm CLC message */
808 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
809 SMC_CLC_CONFIRM);
810 if (reason_code < 0)
811 goto out_err;
812 if (reason_code > 0)
813 goto decline_rdma;
814 smc_conn_save_peer_info(new_smc, &cclc);
815 if (local_contact == SMC_FIRST_CONTACT)
816 smc_link_save_peer_info(link, &cclc);
817
818 rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
819 if (rc) {
820 reason_code = SMC_CLC_DECL_INTERR;
821 goto decline_rdma;
822 }
823
824 if (local_contact == SMC_FIRST_CONTACT) {
825 rc = smc_ib_ready_link(link);
826 if (rc) {
827 reason_code = SMC_CLC_DECL_INTERR;
828 goto decline_rdma;
829 }
830 /* QP confirmation over RoCE fabric */
831 reason_code = smc_serv_conf_first_link(new_smc);
832 if (reason_code < 0) {
833 /* peer is not aware of a problem */
834 rc = reason_code;
835 goto out_err;
836 }
837 if (reason_code > 0)
838 goto decline_rdma;
839 }
840
841 smc_tx_init(new_smc);
842 smc_rx_init(new_smc);
843
844 out_connected:
845 sk_refcnt_debug_inc(newsmcsk);
846 if (newsmcsk->sk_state == SMC_INIT)
847 newsmcsk->sk_state = SMC_ACTIVE;
848 enqueue:
849 if (local_contact == SMC_FIRST_CONTACT)
850 mutex_unlock(&smc_create_lgr_pending);
851 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
852 if (lsmc->sk.sk_state == SMC_LISTEN) {
853 smc_accept_enqueue(&lsmc->sk, newsmcsk);
854 } else { /* no longer listening */
855 smc_close_non_accepted(newsmcsk);
856 }
857 release_sock(&lsmc->sk);
858
859 /* Wake up accept */
860 lsmc->sk.sk_data_ready(&lsmc->sk);
861 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
862 return;
863
864 decline_rdma:
865 /* RDMA setup failed, switch back to TCP */
866 smc_conn_free(&new_smc->conn);
867 new_smc->use_fallback = true;
868 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
869 rc = smc_clc_send_decline(new_smc, reason_code, 0);
870 if (rc < sizeof(struct smc_clc_msg_decline))
871 goto out_err;
872 }
873 goto out_connected;
874
875 out_err:
876 newsmcsk->sk_state = SMC_CLOSED;
877 smc_conn_free(&new_smc->conn);
878 goto enqueue; /* queue new sock with sk_err set */
879 }
880
881 static void smc_tcp_listen_work(struct work_struct *work)
882 {
883 struct smc_sock *lsmc = container_of(work, struct smc_sock,
884 tcp_listen_work);
885 struct smc_sock *new_smc;
886 int rc = 0;
887
888 lock_sock(&lsmc->sk);
889 while (lsmc->sk.sk_state == SMC_LISTEN) {
890 rc = smc_clcsock_accept(lsmc, &new_smc);
891 if (rc)
892 goto out;
893 if (!new_smc)
894 continue;
895
896 new_smc->listen_smc = lsmc;
897 new_smc->use_fallback = false; /* assume rdma capability first*/
898 sock_hold(&lsmc->sk); /* sock_put in smc_listen_work */
899 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
900 smc_copy_sock_settings_to_smc(new_smc);
901 schedule_work(&new_smc->smc_listen_work);
902 }
903
904 out:
905 release_sock(&lsmc->sk);
906 lsmc->sk.sk_data_ready(&lsmc->sk); /* no more listening, wake accept */
907 }
908
909 static int smc_listen(struct socket *sock, int backlog)
910 {
911 struct sock *sk = sock->sk;
912 struct smc_sock *smc;
913 int rc;
914
915 smc = smc_sk(sk);
916 lock_sock(sk);
917
918 rc = -EINVAL;
919 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
920 goto out;
921
922 rc = 0;
923 if (sk->sk_state == SMC_LISTEN) {
924 sk->sk_max_ack_backlog = backlog;
925 goto out;
926 }
927 /* some socket options are handled in core, so we could not apply
928 * them to the clc socket -- copy smc socket options to clc socket
929 */
930 smc_copy_sock_settings_to_clc(smc);
931
932 rc = kernel_listen(smc->clcsock, backlog);
933 if (rc)
934 goto out;
935 sk->sk_max_ack_backlog = backlog;
936 sk->sk_ack_backlog = 0;
937 sk->sk_state = SMC_LISTEN;
938 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
939 schedule_work(&smc->tcp_listen_work);
940
941 out:
942 release_sock(sk);
943 return rc;
944 }
945
946 static int smc_accept(struct socket *sock, struct socket *new_sock,
947 int flags)
948 {
949 struct sock *sk = sock->sk, *nsk;
950 DECLARE_WAITQUEUE(wait, current);
951 struct smc_sock *lsmc;
952 long timeo;
953 int rc = 0;
954
955 lsmc = smc_sk(sk);
956 lock_sock(sk);
957
958 if (lsmc->sk.sk_state != SMC_LISTEN) {
959 rc = -EINVAL;
960 goto out;
961 }
962
963 /* Wait for an incoming connection */
964 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
965 add_wait_queue_exclusive(sk_sleep(sk), &wait);
966 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
967 set_current_state(TASK_INTERRUPTIBLE);
968 if (!timeo) {
969 rc = -EAGAIN;
970 break;
971 }
972 release_sock(sk);
973 timeo = schedule_timeout(timeo);
974 /* wakeup by sk_data_ready in smc_listen_work() */
975 sched_annotate_sleep();
976 lock_sock(sk);
977 if (signal_pending(current)) {
978 rc = sock_intr_errno(timeo);
979 break;
980 }
981 }
982 set_current_state(TASK_RUNNING);
983 remove_wait_queue(sk_sleep(sk), &wait);
984
985 if (!rc)
986 rc = sock_error(nsk);
987
988 out:
989 release_sock(sk);
990 return rc;
991 }
992
993 static int smc_getname(struct socket *sock, struct sockaddr *addr,
994 int *len, int peer)
995 {
996 struct smc_sock *smc;
997
998 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
999 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1000 return -ENOTCONN;
1001
1002 smc = smc_sk(sock->sk);
1003
1004 return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
1005 }
1006
1007 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1008 {
1009 struct sock *sk = sock->sk;
1010 struct smc_sock *smc;
1011 int rc = -EPIPE;
1012
1013 smc = smc_sk(sk);
1014 lock_sock(sk);
1015 if ((sk->sk_state != SMC_ACTIVE) &&
1016 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1017 (sk->sk_state != SMC_INIT))
1018 goto out;
1019 if (smc->use_fallback)
1020 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1021 else
1022 rc = smc_tx_sendmsg(smc, msg, len);
1023 out:
1024 release_sock(sk);
1025 return rc;
1026 }
1027
1028 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1029 int flags)
1030 {
1031 struct sock *sk = sock->sk;
1032 struct smc_sock *smc;
1033 int rc = -ENOTCONN;
1034
1035 smc = smc_sk(sk);
1036 lock_sock(sk);
1037 if ((sk->sk_state == SMC_INIT) ||
1038 (sk->sk_state == SMC_LISTEN) ||
1039 (sk->sk_state == SMC_CLOSED))
1040 goto out;
1041
1042 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1043 rc = 0;
1044 goto out;
1045 }
1046
1047 if (smc->use_fallback)
1048 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1049 else
1050 rc = smc_rx_recvmsg(smc, msg, len, flags);
1051
1052 out:
1053 release_sock(sk);
1054 return rc;
1055 }
1056
1057 static unsigned int smc_accept_poll(struct sock *parent)
1058 {
1059 struct smc_sock *isk;
1060 struct sock *sk;
1061
1062 lock_sock(parent);
1063 list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) {
1064 sk = (struct sock *)isk;
1065
1066 if (sk->sk_state == SMC_ACTIVE) {
1067 release_sock(parent);
1068 return POLLIN | POLLRDNORM;
1069 }
1070 }
1071 release_sock(parent);
1072
1073 return 0;
1074 }
1075
1076 static unsigned int smc_poll(struct file *file, struct socket *sock,
1077 poll_table *wait)
1078 {
1079 struct sock *sk = sock->sk;
1080 unsigned int mask = 0;
1081 struct smc_sock *smc;
1082 int rc;
1083
1084 smc = smc_sk(sock->sk);
1085 if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
1086 /* delegate to CLC child sock */
1087 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1088 /* if non-blocking connect finished ... */
1089 lock_sock(sk);
1090 if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) {
1091 sk->sk_err = smc->clcsock->sk->sk_err;
1092 if (sk->sk_err) {
1093 mask |= POLLERR;
1094 } else {
1095 rc = smc_connect_rdma(smc);
1096 if (rc < 0)
1097 mask |= POLLERR;
1098 else
1099 /* success cases including fallback */
1100 mask |= POLLOUT | POLLWRNORM;
1101 }
1102 }
1103 release_sock(sk);
1104 } else {
1105 sock_poll_wait(file, sk_sleep(sk), wait);
1106 if (sk->sk_state == SMC_LISTEN)
1107 /* woken up by sk_data_ready in smc_listen_work() */
1108 mask |= smc_accept_poll(sk);
1109 if (sk->sk_err)
1110 mask |= POLLERR;
1111 if (atomic_read(&smc->conn.sndbuf_space) ||
1112 (sk->sk_shutdown & SEND_SHUTDOWN)) {
1113 mask |= POLLOUT | POLLWRNORM;
1114 } else {
1115 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1116 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1117 }
1118 if (atomic_read(&smc->conn.bytes_to_rcv))
1119 mask |= POLLIN | POLLRDNORM;
1120 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1121 (sk->sk_state == SMC_CLOSED))
1122 mask |= POLLHUP;
1123 if (sk->sk_shutdown & RCV_SHUTDOWN)
1124 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
1125 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1126 mask |= POLLIN;
1127
1128 }
1129
1130 return mask;
1131 }
1132
1133 static int smc_shutdown(struct socket *sock, int how)
1134 {
1135 struct sock *sk = sock->sk;
1136 struct smc_sock *smc;
1137 int rc = -EINVAL;
1138 int rc1 = 0;
1139
1140 smc = smc_sk(sk);
1141
1142 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1143 return rc;
1144
1145 lock_sock(sk);
1146
1147 rc = -ENOTCONN;
1148 if ((sk->sk_state != SMC_LISTEN) &&
1149 (sk->sk_state != SMC_ACTIVE) &&
1150 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1151 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1152 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1153 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1154 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1155 goto out;
1156 if (smc->use_fallback) {
1157 rc = kernel_sock_shutdown(smc->clcsock, how);
1158 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1159 if (sk->sk_shutdown == SHUTDOWN_MASK)
1160 sk->sk_state = SMC_CLOSED;
1161 goto out;
1162 }
1163 switch (how) {
1164 case SHUT_RDWR: /* shutdown in both directions */
1165 rc = smc_close_active(smc);
1166 break;
1167 case SHUT_WR:
1168 rc = smc_close_shutdown_write(smc);
1169 break;
1170 case SHUT_RD:
1171 if (sk->sk_state == SMC_LISTEN)
1172 rc = smc_close_active(smc);
1173 else
1174 rc = 0;
1175 /* nothing more to do because peer is not involved */
1176 break;
1177 }
1178 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1179 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1180 sk->sk_shutdown |= how + 1;
1181
1182 out:
1183 release_sock(sk);
1184 return rc ? rc : rc1;
1185 }
1186
1187 static int smc_setsockopt(struct socket *sock, int level, int optname,
1188 char __user *optval, unsigned int optlen)
1189 {
1190 struct sock *sk = sock->sk;
1191 struct smc_sock *smc;
1192
1193 smc = smc_sk(sk);
1194
1195 /* generic setsockopts reaching us here always apply to the
1196 * CLC socket
1197 */
1198 return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1199 optval, optlen);
1200 }
1201
1202 static int smc_getsockopt(struct socket *sock, int level, int optname,
1203 char __user *optval, int __user *optlen)
1204 {
1205 struct smc_sock *smc;
1206
1207 smc = smc_sk(sock->sk);
1208 /* socket options apply to the CLC socket */
1209 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1210 optval, optlen);
1211 }
1212
1213 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1214 unsigned long arg)
1215 {
1216 struct smc_sock *smc;
1217
1218 smc = smc_sk(sock->sk);
1219 if (smc->use_fallback)
1220 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1221 else
1222 return sock_no_ioctl(sock, cmd, arg);
1223 }
1224
1225 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1226 int offset, size_t size, int flags)
1227 {
1228 struct sock *sk = sock->sk;
1229 struct smc_sock *smc;
1230 int rc = -EPIPE;
1231
1232 smc = smc_sk(sk);
1233 lock_sock(sk);
1234 if (sk->sk_state != SMC_ACTIVE)
1235 goto out;
1236 if (smc->use_fallback)
1237 rc = kernel_sendpage(smc->clcsock, page, offset,
1238 size, flags);
1239 else
1240 rc = sock_no_sendpage(sock, page, offset, size, flags);
1241
1242 out:
1243 release_sock(sk);
1244 return rc;
1245 }
1246
1247 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1248 struct pipe_inode_info *pipe, size_t len,
1249 unsigned int flags)
1250 {
1251 struct sock *sk = sock->sk;
1252 struct smc_sock *smc;
1253 int rc = -ENOTCONN;
1254
1255 smc = smc_sk(sk);
1256 lock_sock(sk);
1257 if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
1258 goto out;
1259 if (smc->use_fallback) {
1260 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1261 pipe, len, flags);
1262 } else {
1263 rc = -EOPNOTSUPP;
1264 }
1265 out:
1266 release_sock(sk);
1267 return rc;
1268 }
1269
1270 /* must look like tcp */
1271 static const struct proto_ops smc_sock_ops = {
1272 .family = PF_SMC,
1273 .owner = THIS_MODULE,
1274 .release = smc_release,
1275 .bind = smc_bind,
1276 .connect = smc_connect,
1277 .socketpair = sock_no_socketpair,
1278 .accept = smc_accept,
1279 .getname = smc_getname,
1280 .poll = smc_poll,
1281 .ioctl = smc_ioctl,
1282 .listen = smc_listen,
1283 .shutdown = smc_shutdown,
1284 .setsockopt = smc_setsockopt,
1285 .getsockopt = smc_getsockopt,
1286 .sendmsg = smc_sendmsg,
1287 .recvmsg = smc_recvmsg,
1288 .mmap = sock_no_mmap,
1289 .sendpage = smc_sendpage,
1290 .splice_read = smc_splice_read,
1291 };
1292
1293 static int smc_create(struct net *net, struct socket *sock, int protocol,
1294 int kern)
1295 {
1296 struct smc_sock *smc;
1297 struct sock *sk;
1298 int rc;
1299
1300 rc = -ESOCKTNOSUPPORT;
1301 if (sock->type != SOCK_STREAM)
1302 goto out;
1303
1304 rc = -EPROTONOSUPPORT;
1305 if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
1306 goto out;
1307
1308 rc = -ENOBUFS;
1309 sock->ops = &smc_sock_ops;
1310 sk = smc_sock_alloc(net, sock);
1311 if (!sk)
1312 goto out;
1313
1314 /* create internal TCP socket for CLC handshake and fallback */
1315 smc = smc_sk(sk);
1316 smc->use_fallback = false; /* assume rdma capability first */
1317 rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
1318 IPPROTO_TCP, &smc->clcsock);
1319 if (rc)
1320 sk_common_release(sk);
1321 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1322 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1323
1324 out:
1325 return rc;
1326 }
1327
1328 static const struct net_proto_family smc_sock_family_ops = {
1329 .family = PF_SMC,
1330 .owner = THIS_MODULE,
1331 .create = smc_create,
1332 };
1333
1334 static int __init smc_init(void)
1335 {
1336 int rc;
1337
1338 rc = smc_pnet_init();
1339 if (rc)
1340 return rc;
1341
1342 rc = smc_llc_init();
1343 if (rc) {
1344 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1345 goto out_pnet;
1346 }
1347
1348 rc = smc_cdc_init();
1349 if (rc) {
1350 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1351 goto out_pnet;
1352 }
1353
1354 rc = proto_register(&smc_proto, 1);
1355 if (rc) {
1356 pr_err("%s: proto_register fails with %d\n", __func__, rc);
1357 goto out_pnet;
1358 }
1359
1360 rc = sock_register(&smc_sock_family_ops);
1361 if (rc) {
1362 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1363 goto out_proto;
1364 }
1365 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1366
1367 rc = smc_ib_register_client();
1368 if (rc) {
1369 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1370 goto out_sock;
1371 }
1372
1373 return 0;
1374
1375 out_sock:
1376 sock_unregister(PF_SMC);
1377 out_proto:
1378 proto_unregister(&smc_proto);
1379 out_pnet:
1380 smc_pnet_exit();
1381 return rc;
1382 }
1383
1384 static void __exit smc_exit(void)
1385 {
1386 struct smc_link_group *lgr, *lg;
1387 LIST_HEAD(lgr_freeing_list);
1388
1389 spin_lock_bh(&smc_lgr_list.lock);
1390 if (!list_empty(&smc_lgr_list.list))
1391 list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1392 spin_unlock_bh(&smc_lgr_list.lock);
1393 list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1394 list_del_init(&lgr->list);
1395 smc_lgr_free(lgr); /* free link group */
1396 }
1397 smc_ib_unregister_client();
1398 sock_unregister(PF_SMC);
1399 proto_unregister(&smc_proto);
1400 smc_pnet_exit();
1401 }
1402
1403 module_init(smc_init);
1404 module_exit(smc_exit);
1405
1406 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
1407 MODULE_DESCRIPTION("smc socket address family");
1408 MODULE_LICENSE("GPL");
1409 MODULE_ALIAS_NETPROTO(PF_SMC);
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