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19#define KMSG_COMPONENT "smc"
20#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21
22#include <linux/module.h>
23#include <linux/socket.h>
24#include <linux/workqueue.h>
25#include <linux/in.h>
26#include <linux/sched/signal.h>
27#include <linux/if_vlan.h>
28#include <linux/rcupdate_wait.h>
29
30#include <net/sock.h>
31#include <net/tcp.h>
32#include <net/smc.h>
33#include <asm/ioctls.h>
34
35#include <net/net_namespace.h>
36#include <net/netns/generic.h>
37#include "smc_netns.h"
38
39#include "smc.h"
40#include "smc_clc.h"
41#include "smc_llc.h"
42#include "smc_cdc.h"
43#include "smc_core.h"
44#include "smc_ib.h"
45#include "smc_ism.h"
46#include "smc_pnet.h"
47#include "smc_tx.h"
48#include "smc_rx.h"
49#include "smc_close.h"
50
51static DEFINE_MUTEX(smc_server_lgr_pending);
52
53
54static DEFINE_MUTEX(smc_client_lgr_pending);
55
56
57
58static void smc_tcp_listen_work(struct work_struct *);
59static void smc_connect_work(struct work_struct *);
60
61static void smc_set_keepalive(struct sock *sk, int val)
62{
63 struct smc_sock *smc = smc_sk(sk);
64
65 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
66}
67
68static struct smc_hashinfo smc_v4_hashinfo = {
69 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
70};
71
72static struct smc_hashinfo smc_v6_hashinfo = {
73 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
74};
75
76int smc_hash_sk(struct sock *sk)
77{
78 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
79 struct hlist_head *head;
80
81 head = &h->ht;
82
83 write_lock_bh(&h->lock);
84 sk_add_node(sk, head);
85 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
86 write_unlock_bh(&h->lock);
87
88 return 0;
89}
90EXPORT_SYMBOL_GPL(smc_hash_sk);
91
92void smc_unhash_sk(struct sock *sk)
93{
94 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
95
96 write_lock_bh(&h->lock);
97 if (sk_del_node_init(sk))
98 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
99 write_unlock_bh(&h->lock);
100}
101EXPORT_SYMBOL_GPL(smc_unhash_sk);
102
103struct proto smc_proto = {
104 .name = "SMC",
105 .owner = THIS_MODULE,
106 .keepalive = smc_set_keepalive,
107 .hash = smc_hash_sk,
108 .unhash = smc_unhash_sk,
109 .obj_size = sizeof(struct smc_sock),
110 .h.smc_hash = &smc_v4_hashinfo,
111 .slab_flags = SLAB_TYPESAFE_BY_RCU,
112};
113EXPORT_SYMBOL_GPL(smc_proto);
114
115struct proto smc_proto6 = {
116 .name = "SMC6",
117 .owner = THIS_MODULE,
118 .keepalive = smc_set_keepalive,
119 .hash = smc_hash_sk,
120 .unhash = smc_unhash_sk,
121 .obj_size = sizeof(struct smc_sock),
122 .h.smc_hash = &smc_v6_hashinfo,
123 .slab_flags = SLAB_TYPESAFE_BY_RCU,
124};
125EXPORT_SYMBOL_GPL(smc_proto6);
126
127static void smc_restore_fallback_changes(struct smc_sock *smc)
128{
129 if (smc->clcsock->file) {
130 smc->clcsock->file->private_data = smc->sk.sk_socket;
131 smc->clcsock->file = NULL;
132 }
133}
134
135static int __smc_release(struct smc_sock *smc)
136{
137 struct sock *sk = &smc->sk;
138 int rc = 0;
139
140 if (!smc->use_fallback) {
141 rc = smc_close_active(smc);
142 sock_set_flag(sk, SOCK_DEAD);
143 sk->sk_shutdown |= SHUTDOWN_MASK;
144 } else {
145 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
146 sock_put(sk);
147 if (sk->sk_state == SMC_LISTEN) {
148
149 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
150 }
151 sk->sk_state = SMC_CLOSED;
152 sk->sk_state_change(sk);
153 smc_restore_fallback_changes(smc);
154 }
155
156 sk->sk_prot->unhash(sk);
157
158 if (sk->sk_state == SMC_CLOSED) {
159 if (smc->clcsock) {
160 release_sock(sk);
161 smc_clcsock_release(smc);
162 lock_sock(sk);
163 }
164 if (!smc->use_fallback)
165 smc_conn_free(&smc->conn);
166 }
167
168 return rc;
169}
170
171static int smc_release(struct socket *sock)
172{
173 struct sock *sk = sock->sk;
174 struct smc_sock *smc;
175 int rc = 0;
176
177 if (!sk)
178 goto out;
179
180 sock_hold(sk);
181 smc = smc_sk(sk);
182
183
184 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
185 tcp_abort(smc->clcsock->sk, ECONNABORTED);
186 flush_work(&smc->connect_work);
187
188 if (sk->sk_state == SMC_LISTEN)
189
190
191
192 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
193 else
194 lock_sock(sk);
195
196 rc = __smc_release(smc);
197
198
199 sock_orphan(sk);
200 sock->sk = NULL;
201 release_sock(sk);
202
203 sock_put(sk);
204 sock_put(sk);
205out:
206 return rc;
207}
208
209static void smc_destruct(struct sock *sk)
210{
211 if (sk->sk_state != SMC_CLOSED)
212 return;
213 if (!sock_flag(sk, SOCK_DEAD))
214 return;
215
216 sk_refcnt_debug_dec(sk);
217}
218
219static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
220 int protocol)
221{
222 struct smc_sock *smc;
223 struct proto *prot;
224 struct sock *sk;
225
226 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
227 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
228 if (!sk)
229 return NULL;
230
231 sock_init_data(sock, sk);
232 sk->sk_state = SMC_INIT;
233 sk->sk_destruct = smc_destruct;
234 sk->sk_protocol = protocol;
235 smc = smc_sk(sk);
236 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
237 INIT_WORK(&smc->connect_work, smc_connect_work);
238 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
239 INIT_LIST_HEAD(&smc->accept_q);
240 spin_lock_init(&smc->accept_q_lock);
241 spin_lock_init(&smc->conn.send_lock);
242 sk->sk_prot->hash(sk);
243 sk_refcnt_debug_inc(sk);
244 mutex_init(&smc->clcsock_release_lock);
245
246 return sk;
247}
248
249static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
250 int addr_len)
251{
252 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
253 struct sock *sk = sock->sk;
254 struct smc_sock *smc;
255 int rc;
256
257 smc = smc_sk(sk);
258
259
260 rc = -EINVAL;
261 if (addr_len < sizeof(struct sockaddr_in))
262 goto out;
263
264 rc = -EAFNOSUPPORT;
265 if (addr->sin_family != AF_INET &&
266 addr->sin_family != AF_INET6 &&
267 addr->sin_family != AF_UNSPEC)
268 goto out;
269
270 if (addr->sin_family == AF_UNSPEC &&
271 addr->sin_addr.s_addr != htonl(INADDR_ANY))
272 goto out;
273
274 lock_sock(sk);
275
276
277 rc = -EINVAL;
278 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
279 goto out_rel;
280
281 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
282 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
283
284out_rel:
285 release_sock(sk);
286out:
287 return rc;
288}
289
290static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
291 unsigned long mask)
292{
293
294 nsk->sk_type = osk->sk_type;
295 nsk->sk_sndbuf = osk->sk_sndbuf;
296 nsk->sk_rcvbuf = osk->sk_rcvbuf;
297 nsk->sk_sndtimeo = osk->sk_sndtimeo;
298 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
299 nsk->sk_mark = osk->sk_mark;
300 nsk->sk_priority = osk->sk_priority;
301 nsk->sk_rcvlowat = osk->sk_rcvlowat;
302 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
303 nsk->sk_err = osk->sk_err;
304
305 nsk->sk_flags &= ~mask;
306 nsk->sk_flags |= osk->sk_flags & mask;
307}
308
309#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
310 (1UL << SOCK_KEEPOPEN) | \
311 (1UL << SOCK_LINGER) | \
312 (1UL << SOCK_BROADCAST) | \
313 (1UL << SOCK_TIMESTAMP) | \
314 (1UL << SOCK_DBG) | \
315 (1UL << SOCK_RCVTSTAMP) | \
316 (1UL << SOCK_RCVTSTAMPNS) | \
317 (1UL << SOCK_LOCALROUTE) | \
318 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
319 (1UL << SOCK_RXQ_OVFL) | \
320 (1UL << SOCK_WIFI_STATUS) | \
321 (1UL << SOCK_NOFCS) | \
322 (1UL << SOCK_FILTER_LOCKED) | \
323 (1UL << SOCK_TSTAMP_NEW))
324
325
326
327static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
328{
329 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
330}
331
332#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
333 (1UL << SOCK_KEEPOPEN) | \
334 (1UL << SOCK_LINGER) | \
335 (1UL << SOCK_DBG))
336
337static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
338{
339 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
340}
341
342
343static int smcr_lgr_reg_rmbs(struct smc_link *link,
344 struct smc_buf_desc *rmb_desc)
345{
346 struct smc_link_group *lgr = link->lgr;
347 int i, rc = 0;
348
349 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
350 if (rc)
351 return rc;
352
353
354
355 mutex_lock(&lgr->llc_conf_mutex);
356 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
357 if (!smc_link_active(&lgr->lnk[i]))
358 continue;
359 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
360 if (rc)
361 goto out;
362 }
363
364
365 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
366 if (rc) {
367 rc = -EFAULT;
368 goto out;
369 }
370 rmb_desc->is_conf_rkey = true;
371out:
372 mutex_unlock(&lgr->llc_conf_mutex);
373 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
374 return rc;
375}
376
377static int smcr_clnt_conf_first_link(struct smc_sock *smc)
378{
379 struct smc_link *link = smc->conn.lnk;
380 struct smc_llc_qentry *qentry;
381 int rc;
382
383
384 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
385 SMC_LLC_CONFIRM_LINK);
386 if (!qentry) {
387 struct smc_clc_msg_decline dclc;
388
389 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
390 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
391 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
392 }
393 smc_llc_save_peer_uid(qentry);
394 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
395 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
396 if (rc)
397 return SMC_CLC_DECL_RMBE_EC;
398
399 rc = smc_ib_modify_qp_rts(link);
400 if (rc)
401 return SMC_CLC_DECL_ERR_RDYLNK;
402
403 smc_wr_remember_qp_attr(link);
404
405 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
406 return SMC_CLC_DECL_ERR_REGRMB;
407
408
409 smc->conn.rmb_desc->is_conf_rkey = true;
410
411
412 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
413 if (rc < 0)
414 return SMC_CLC_DECL_TIMEOUT_CL;
415
416 smc_llc_link_active(link);
417 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
418
419
420 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
421 SMC_LLC_ADD_LINK);
422 if (!qentry) {
423 struct smc_clc_msg_decline dclc;
424
425 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
426 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
427 if (rc == -EAGAIN)
428 rc = 0;
429 return rc;
430 }
431 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
432 smc_llc_cli_add_link(link, qentry);
433 return 0;
434}
435
436static void smcr_conn_save_peer_info(struct smc_sock *smc,
437 struct smc_clc_msg_accept_confirm *clc)
438{
439 int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
440
441 smc->conn.peer_rmbe_idx = clc->rmbe_idx;
442 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
443 smc->conn.peer_rmbe_size = bufsize;
444 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
445 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
446}
447
448static void smcd_conn_save_peer_info(struct smc_sock *smc,
449 struct smc_clc_msg_accept_confirm *clc)
450{
451 int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
452
453 smc->conn.peer_rmbe_idx = clc->dmbe_idx;
454 smc->conn.peer_token = clc->token;
455
456 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
457 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
458 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
459}
460
461static void smc_conn_save_peer_info(struct smc_sock *smc,
462 struct smc_clc_msg_accept_confirm *clc)
463{
464 if (smc->conn.lgr->is_smcd)
465 smcd_conn_save_peer_info(smc, clc);
466 else
467 smcr_conn_save_peer_info(smc, clc);
468}
469
470static void smc_link_save_peer_info(struct smc_link *link,
471 struct smc_clc_msg_accept_confirm *clc)
472{
473 link->peer_qpn = ntoh24(clc->qpn);
474 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
475 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
476 link->peer_psn = ntoh24(clc->psn);
477 link->peer_mtu = clc->qp_mtu;
478}
479
480static void smc_switch_to_fallback(struct smc_sock *smc)
481{
482 smc->use_fallback = true;
483 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
484 smc->clcsock->file = smc->sk.sk_socket->file;
485 smc->clcsock->file->private_data = smc->clcsock;
486 smc->clcsock->wq.fasync_list =
487 smc->sk.sk_socket->wq.fasync_list;
488 }
489}
490
491
492static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
493{
494 smc_switch_to_fallback(smc);
495 smc->fallback_rsn = reason_code;
496 smc_copy_sock_settings_to_clc(smc);
497 smc->connect_nonblock = 0;
498 if (smc->sk.sk_state == SMC_INIT)
499 smc->sk.sk_state = SMC_ACTIVE;
500 return 0;
501}
502
503
504static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
505{
506 int rc;
507
508 if (reason_code < 0) {
509 if (smc->sk.sk_state == SMC_INIT)
510 sock_put(&smc->sk);
511 return reason_code;
512 }
513 if (reason_code != SMC_CLC_DECL_PEERDECL) {
514 rc = smc_clc_send_decline(smc, reason_code);
515 if (rc < 0) {
516 if (smc->sk.sk_state == SMC_INIT)
517 sock_put(&smc->sk);
518 return rc;
519 }
520 }
521 return smc_connect_fallback(smc, reason_code);
522}
523
524
525static int smc_connect_abort(struct smc_sock *smc, int reason_code,
526 int local_contact)
527{
528 bool is_smcd = smc->conn.lgr->is_smcd;
529
530 if (local_contact == SMC_FIRST_CONTACT)
531 smc_lgr_cleanup_early(&smc->conn);
532 else
533 smc_conn_free(&smc->conn);
534 if (is_smcd)
535
536 mutex_unlock(&smc_server_lgr_pending);
537 else
538 mutex_unlock(&smc_client_lgr_pending);
539
540 smc->connect_nonblock = 0;
541 return reason_code;
542}
543
544
545
546static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
547{
548
549
550
551
552 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
553 if (!ini->ib_dev)
554 return SMC_CLC_DECL_NOSMCRDEV;
555 return 0;
556}
557
558
559
560static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
561{
562
563 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
564 if (!ini->ism_dev)
565 return SMC_CLC_DECL_NOSMCDDEV;
566 return 0;
567}
568
569
570static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
571 struct smc_init_info *ini)
572{
573 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id))
574 return SMC_CLC_DECL_ISMVLANERR;
575 return 0;
576}
577
578
579
580
581static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
582 struct smc_init_info *ini)
583{
584 if (!is_smcd)
585 return 0;
586 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id))
587 return SMC_CLC_DECL_CNFERR;
588 return 0;
589}
590
591
592static int smc_connect_clc(struct smc_sock *smc, int smc_type,
593 struct smc_clc_msg_accept_confirm *aclc,
594 struct smc_init_info *ini)
595{
596 int rc = 0;
597
598
599 rc = smc_clc_send_proposal(smc, smc_type, ini);
600 if (rc)
601 return rc;
602
603 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
604 CLC_WAIT_TIME);
605}
606
607
608static int smc_connect_rdma(struct smc_sock *smc,
609 struct smc_clc_msg_accept_confirm *aclc,
610 struct smc_init_info *ini)
611{
612 int i, reason_code = 0;
613 struct smc_link *link;
614
615 ini->is_smcd = false;
616 ini->ib_lcl = &aclc->lcl;
617 ini->ib_clcqpn = ntoh24(aclc->qpn);
618 ini->srv_first_contact = aclc->hdr.flag;
619
620 mutex_lock(&smc_client_lgr_pending);
621 reason_code = smc_conn_create(smc, ini);
622 if (reason_code) {
623 mutex_unlock(&smc_client_lgr_pending);
624 return reason_code;
625 }
626
627 smc_conn_save_peer_info(smc, aclc);
628
629 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
630 link = smc->conn.lnk;
631 } else {
632
633 link = NULL;
634 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
635 struct smc_link *l = &smc->conn.lgr->lnk[i];
636
637 if (l->peer_qpn == ntoh24(aclc->qpn) &&
638 !memcmp(l->peer_gid, &aclc->lcl.gid, SMC_GID_SIZE) &&
639 !memcmp(l->peer_mac, &aclc->lcl.mac, sizeof(l->peer_mac))) {
640 link = l;
641 break;
642 }
643 }
644 if (!link)
645 return smc_connect_abort(smc, SMC_CLC_DECL_NOSRVLINK,
646 ini->cln_first_contact);
647 smc->conn.lnk = link;
648 }
649
650
651 if (smc_buf_create(smc, false))
652 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
653 ini->cln_first_contact);
654
655 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
656 smc_link_save_peer_info(link, aclc);
657
658 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc))
659 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
660 ini->cln_first_contact);
661
662 smc_close_init(smc);
663 smc_rx_init(smc);
664
665 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
666 if (smc_ib_ready_link(link))
667 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
668 ini->cln_first_contact);
669 } else {
670 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc))
671 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
672 ini->cln_first_contact);
673 }
674 smc_rmb_sync_sg_for_device(&smc->conn);
675
676 reason_code = smc_clc_send_confirm(smc);
677 if (reason_code)
678 return smc_connect_abort(smc, reason_code,
679 ini->cln_first_contact);
680
681 smc_tx_init(smc);
682
683 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
684
685 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
686 reason_code = smcr_clnt_conf_first_link(smc);
687 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
688 if (reason_code)
689 return smc_connect_abort(smc, reason_code,
690 ini->cln_first_contact);
691 }
692 mutex_unlock(&smc_client_lgr_pending);
693
694 smc_copy_sock_settings_to_clc(smc);
695 smc->connect_nonblock = 0;
696 if (smc->sk.sk_state == SMC_INIT)
697 smc->sk.sk_state = SMC_ACTIVE;
698
699 return 0;
700}
701
702
703static int smc_connect_ism(struct smc_sock *smc,
704 struct smc_clc_msg_accept_confirm *aclc,
705 struct smc_init_info *ini)
706{
707 int rc = 0;
708
709 ini->is_smcd = true;
710 ini->ism_gid = aclc->gid;
711 ini->srv_first_contact = aclc->hdr.flag;
712
713
714 mutex_lock(&smc_server_lgr_pending);
715 rc = smc_conn_create(smc, ini);
716 if (rc) {
717 mutex_unlock(&smc_server_lgr_pending);
718 return rc;
719 }
720
721
722 rc = smc_buf_create(smc, true);
723 if (rc)
724 return smc_connect_abort(smc, (rc == -ENOSPC) ?
725 SMC_CLC_DECL_MAX_DMB :
726 SMC_CLC_DECL_MEM,
727 ini->cln_first_contact);
728
729 smc_conn_save_peer_info(smc, aclc);
730 smc_close_init(smc);
731 smc_rx_init(smc);
732 smc_tx_init(smc);
733
734 rc = smc_clc_send_confirm(smc);
735 if (rc)
736 return smc_connect_abort(smc, rc, ini->cln_first_contact);
737 mutex_unlock(&smc_server_lgr_pending);
738
739 smc_copy_sock_settings_to_clc(smc);
740 smc->connect_nonblock = 0;
741 if (smc->sk.sk_state == SMC_INIT)
742 smc->sk.sk_state = SMC_ACTIVE;
743
744 return 0;
745}
746
747
748static int __smc_connect(struct smc_sock *smc)
749{
750 bool ism_supported = false, rdma_supported = false;
751 struct smc_clc_msg_accept_confirm aclc;
752 struct smc_init_info ini = {0};
753 int smc_type;
754 int rc = 0;
755
756 if (smc->use_fallback)
757 return smc_connect_fallback(smc, smc->fallback_rsn);
758
759
760 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
761 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
762
763
764 if (using_ipsec(smc))
765 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
766
767
768 if (smc_vlan_by_tcpsk(smc->clcsock, &ini))
769 return smc_connect_decline_fallback(smc,
770 SMC_CLC_DECL_GETVLANERR);
771
772
773 if (!smc_find_ism_device(smc, &ini) &&
774 !smc_connect_ism_vlan_setup(smc, &ini)) {
775
776 ism_supported = true;
777 smc_type = SMC_TYPE_D;
778 }
779
780
781 if (!smc_find_rdma_device(smc, &ini)) {
782
783 rdma_supported = true;
784 if (ism_supported)
785 smc_type = SMC_TYPE_B;
786 else
787 smc_type = SMC_TYPE_R;
788 }
789
790
791 if (!rdma_supported && !ism_supported)
792 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
793
794
795 rc = smc_connect_clc(smc, smc_type, &aclc, &ini);
796 if (rc) {
797 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
798 return smc_connect_decline_fallback(smc, rc);
799 }
800
801
802 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
803 rc = smc_connect_rdma(smc, &aclc, &ini);
804 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
805 rc = smc_connect_ism(smc, &aclc, &ini);
806 else
807 rc = SMC_CLC_DECL_MODEUNSUPP;
808 if (rc) {
809 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
810 return smc_connect_decline_fallback(smc, rc);
811 }
812
813 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
814 return 0;
815}
816
817static void smc_connect_work(struct work_struct *work)
818{
819 struct smc_sock *smc = container_of(work, struct smc_sock,
820 connect_work);
821 long timeo = smc->sk.sk_sndtimeo;
822 int rc = 0;
823
824 if (!timeo)
825 timeo = MAX_SCHEDULE_TIMEOUT;
826 lock_sock(smc->clcsock->sk);
827 if (smc->clcsock->sk->sk_err) {
828 smc->sk.sk_err = smc->clcsock->sk->sk_err;
829 } else if ((1 << smc->clcsock->sk->sk_state) &
830 (TCPF_SYN_SENT | TCP_SYN_RECV)) {
831 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
832 if ((rc == -EPIPE) &&
833 ((1 << smc->clcsock->sk->sk_state) &
834 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
835 rc = 0;
836 }
837 release_sock(smc->clcsock->sk);
838 lock_sock(&smc->sk);
839 if (rc != 0 || smc->sk.sk_err) {
840 smc->sk.sk_state = SMC_CLOSED;
841 if (rc == -EPIPE || rc == -EAGAIN)
842 smc->sk.sk_err = EPIPE;
843 else if (signal_pending(current))
844 smc->sk.sk_err = -sock_intr_errno(timeo);
845 sock_put(&smc->sk);
846 goto out;
847 }
848
849 rc = __smc_connect(smc);
850 if (rc < 0)
851 smc->sk.sk_err = -rc;
852
853out:
854 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
855 if (smc->sk.sk_err) {
856 smc->sk.sk_state_change(&smc->sk);
857 } else {
858 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
859 smc->sk.sk_write_space(&smc->sk);
860 }
861 }
862 release_sock(&smc->sk);
863}
864
865static int smc_connect(struct socket *sock, struct sockaddr *addr,
866 int alen, int flags)
867{
868 struct sock *sk = sock->sk;
869 struct smc_sock *smc;
870 int rc = -EINVAL;
871
872 smc = smc_sk(sk);
873
874
875 if (alen < sizeof(addr->sa_family))
876 goto out_err;
877 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
878 goto out_err;
879
880 lock_sock(sk);
881 switch (sk->sk_state) {
882 default:
883 goto out;
884 case SMC_ACTIVE:
885 rc = -EISCONN;
886 goto out;
887 case SMC_INIT:
888 rc = 0;
889 break;
890 }
891
892 smc_copy_sock_settings_to_clc(smc);
893 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
894 if (smc->connect_nonblock) {
895 rc = -EALREADY;
896 goto out;
897 }
898 rc = kernel_connect(smc->clcsock, addr, alen, flags);
899 if (rc && rc != -EINPROGRESS)
900 goto out;
901
902 sock_hold(&smc->sk);
903 if (smc->use_fallback)
904 goto out;
905 if (flags & O_NONBLOCK) {
906 if (schedule_work(&smc->connect_work))
907 smc->connect_nonblock = 1;
908 rc = -EINPROGRESS;
909 } else {
910 rc = __smc_connect(smc);
911 if (rc < 0)
912 goto out;
913 else
914 rc = 0;
915 }
916
917out:
918 release_sock(sk);
919out_err:
920 return rc;
921}
922
923static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
924{
925 struct socket *new_clcsock = NULL;
926 struct sock *lsk = &lsmc->sk;
927 struct sock *new_sk;
928 int rc = -EINVAL;
929
930 release_sock(lsk);
931 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
932 if (!new_sk) {
933 rc = -ENOMEM;
934 lsk->sk_err = ENOMEM;
935 *new_smc = NULL;
936 lock_sock(lsk);
937 goto out;
938 }
939 *new_smc = smc_sk(new_sk);
940
941 mutex_lock(&lsmc->clcsock_release_lock);
942 if (lsmc->clcsock)
943 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
944 mutex_unlock(&lsmc->clcsock_release_lock);
945 lock_sock(lsk);
946 if (rc < 0)
947 lsk->sk_err = -rc;
948 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
949 new_sk->sk_prot->unhash(new_sk);
950 if (new_clcsock)
951 sock_release(new_clcsock);
952 new_sk->sk_state = SMC_CLOSED;
953 sock_set_flag(new_sk, SOCK_DEAD);
954 sock_put(new_sk);
955 *new_smc = NULL;
956 goto out;
957 }
958
959 (*new_smc)->clcsock = new_clcsock;
960out:
961 return rc;
962}
963
964
965
966
967static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
968{
969 struct smc_sock *par = smc_sk(parent);
970
971 sock_hold(sk);
972 spin_lock(&par->accept_q_lock);
973 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
974 spin_unlock(&par->accept_q_lock);
975 sk_acceptq_added(parent);
976}
977
978
979static void smc_accept_unlink(struct sock *sk)
980{
981 struct smc_sock *par = smc_sk(sk)->listen_smc;
982
983 spin_lock(&par->accept_q_lock);
984 list_del_init(&smc_sk(sk)->accept_q);
985 spin_unlock(&par->accept_q_lock);
986 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
987 sock_put(sk);
988}
989
990
991
992
993struct sock *smc_accept_dequeue(struct sock *parent,
994 struct socket *new_sock)
995{
996 struct smc_sock *isk, *n;
997 struct sock *new_sk;
998
999 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1000 new_sk = (struct sock *)isk;
1001
1002 smc_accept_unlink(new_sk);
1003 if (new_sk->sk_state == SMC_CLOSED) {
1004 new_sk->sk_prot->unhash(new_sk);
1005 if (isk->clcsock) {
1006 sock_release(isk->clcsock);
1007 isk->clcsock = NULL;
1008 }
1009 sock_put(new_sk);
1010 continue;
1011 }
1012 if (new_sock) {
1013 sock_graft(new_sk, new_sock);
1014 if (isk->use_fallback) {
1015 smc_sk(new_sk)->clcsock->file = new_sock->file;
1016 isk->clcsock->file->private_data = isk->clcsock;
1017 }
1018 }
1019 return new_sk;
1020 }
1021 return NULL;
1022}
1023
1024
1025void smc_close_non_accepted(struct sock *sk)
1026{
1027 struct smc_sock *smc = smc_sk(sk);
1028
1029 sock_hold(sk);
1030 lock_sock(sk);
1031 if (!sk->sk_lingertime)
1032
1033 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
1034 __smc_release(smc);
1035 release_sock(sk);
1036 sock_put(sk);
1037 sock_put(sk);
1038}
1039
1040static int smcr_serv_conf_first_link(struct smc_sock *smc)
1041{
1042 struct smc_link *link = smc->conn.lnk;
1043 struct smc_llc_qentry *qentry;
1044 int rc;
1045
1046 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
1047 return SMC_CLC_DECL_ERR_REGRMB;
1048
1049
1050 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1051 if (rc < 0)
1052 return SMC_CLC_DECL_TIMEOUT_CL;
1053
1054
1055 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1056 SMC_LLC_CONFIRM_LINK);
1057 if (!qentry) {
1058 struct smc_clc_msg_decline dclc;
1059
1060 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1061 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1062 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1063 }
1064 smc_llc_save_peer_uid(qentry);
1065 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1066 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1067 if (rc)
1068 return SMC_CLC_DECL_RMBE_EC;
1069
1070
1071 smc->conn.rmb_desc->is_conf_rkey = true;
1072
1073 smc_llc_link_active(link);
1074 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1075
1076
1077 smc_llc_srv_add_link(link);
1078 return 0;
1079}
1080
1081
1082static void smc_listen_out(struct smc_sock *new_smc)
1083{
1084 struct smc_sock *lsmc = new_smc->listen_smc;
1085 struct sock *newsmcsk = &new_smc->sk;
1086
1087 if (lsmc->sk.sk_state == SMC_LISTEN) {
1088 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1089 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1090 release_sock(&lsmc->sk);
1091 } else {
1092 smc_close_non_accepted(newsmcsk);
1093 }
1094
1095
1096 lsmc->sk.sk_data_ready(&lsmc->sk);
1097 sock_put(&lsmc->sk);
1098}
1099
1100
1101static void smc_listen_out_connected(struct smc_sock *new_smc)
1102{
1103 struct sock *newsmcsk = &new_smc->sk;
1104
1105 sk_refcnt_debug_inc(newsmcsk);
1106 if (newsmcsk->sk_state == SMC_INIT)
1107 newsmcsk->sk_state = SMC_ACTIVE;
1108
1109 smc_listen_out(new_smc);
1110}
1111
1112
1113static void smc_listen_out_err(struct smc_sock *new_smc)
1114{
1115 struct sock *newsmcsk = &new_smc->sk;
1116
1117 if (newsmcsk->sk_state == SMC_INIT)
1118 sock_put(&new_smc->sk);
1119 newsmcsk->sk_state = SMC_CLOSED;
1120
1121 smc_listen_out(new_smc);
1122}
1123
1124
1125static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1126 int local_contact)
1127{
1128
1129 if (local_contact == SMC_FIRST_CONTACT)
1130 smc_lgr_cleanup_early(&new_smc->conn);
1131 else
1132 smc_conn_free(&new_smc->conn);
1133 if (reason_code < 0) {
1134 smc_listen_out_err(new_smc);
1135 return;
1136 }
1137 smc_switch_to_fallback(new_smc);
1138 new_smc->fallback_rsn = reason_code;
1139 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1140 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1141 smc_listen_out_err(new_smc);
1142 return;
1143 }
1144 }
1145 smc_listen_out_connected(new_smc);
1146}
1147
1148
1149static int smc_listen_prfx_check(struct smc_sock *new_smc,
1150 struct smc_clc_msg_proposal *pclc)
1151{
1152 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1153 struct socket *newclcsock = new_smc->clcsock;
1154
1155 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1156 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1157 return SMC_CLC_DECL_DIFFPREFIX;
1158
1159 return 0;
1160}
1161
1162
1163static int smc_listen_rdma_init(struct smc_sock *new_smc,
1164 struct smc_init_info *ini)
1165{
1166 int rc;
1167
1168
1169 rc = smc_conn_create(new_smc, ini);
1170 if (rc)
1171 return rc;
1172
1173
1174 if (smc_buf_create(new_smc, false))
1175 return SMC_CLC_DECL_MEM;
1176
1177 return 0;
1178}
1179
1180
1181static int smc_listen_ism_init(struct smc_sock *new_smc,
1182 struct smc_clc_msg_proposal *pclc,
1183 struct smc_init_info *ini)
1184{
1185 struct smc_clc_msg_smcd *pclc_smcd;
1186 int rc;
1187
1188 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1189 ini->ism_gid = pclc_smcd->gid;
1190 rc = smc_conn_create(new_smc, ini);
1191 if (rc)
1192 return rc;
1193
1194
1195 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1196 new_smc->conn.lgr->vlan_id,
1197 new_smc->conn.lgr->smcd)) {
1198 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1199 smc_lgr_cleanup_early(&new_smc->conn);
1200 else
1201 smc_conn_free(&new_smc->conn);
1202 return SMC_CLC_DECL_SMCDNOTALK;
1203 }
1204
1205
1206 rc = smc_buf_create(new_smc, true);
1207 if (rc) {
1208 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1209 smc_lgr_cleanup_early(&new_smc->conn);
1210 else
1211 smc_conn_free(&new_smc->conn);
1212 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1213 SMC_CLC_DECL_MEM;
1214 }
1215
1216 return 0;
1217}
1218
1219
1220static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1221{
1222 struct smc_connection *conn = &new_smc->conn;
1223
1224 if (local_contact != SMC_FIRST_CONTACT) {
1225 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
1226 return SMC_CLC_DECL_ERR_REGRMB;
1227 }
1228 smc_rmb_sync_sg_for_device(&new_smc->conn);
1229
1230 return 0;
1231}
1232
1233
1234static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1235 struct smc_clc_msg_accept_confirm *cclc,
1236 int local_contact)
1237{
1238 struct smc_link *link = new_smc->conn.lnk;
1239 int reason_code = 0;
1240
1241 if (local_contact == SMC_FIRST_CONTACT)
1242 smc_link_save_peer_info(link, cclc);
1243
1244 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc)) {
1245 reason_code = SMC_CLC_DECL_ERR_RTOK;
1246 goto decline;
1247 }
1248
1249 if (local_contact == SMC_FIRST_CONTACT) {
1250 if (smc_ib_ready_link(link)) {
1251 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1252 goto decline;
1253 }
1254
1255 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1256 reason_code = smcr_serv_conf_first_link(new_smc);
1257 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1258 if (reason_code)
1259 goto decline;
1260 }
1261 return 0;
1262
1263decline:
1264 smc_listen_decline(new_smc, reason_code, local_contact);
1265 return reason_code;
1266}
1267
1268
1269static void smc_listen_work(struct work_struct *work)
1270{
1271 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1272 smc_listen_work);
1273 struct socket *newclcsock = new_smc->clcsock;
1274 struct smc_clc_msg_accept_confirm cclc;
1275 struct smc_clc_msg_proposal *pclc;
1276 struct smc_init_info ini = {0};
1277 bool ism_supported = false;
1278 u8 buf[SMC_CLC_MAX_LEN];
1279 int rc = 0;
1280
1281 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1282 return smc_listen_out_err(new_smc);
1283
1284 if (new_smc->use_fallback) {
1285 smc_listen_out_connected(new_smc);
1286 return;
1287 }
1288
1289
1290 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1291 smc_switch_to_fallback(new_smc);
1292 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1293 smc_listen_out_connected(new_smc);
1294 return;
1295 }
1296
1297
1298
1299
1300 pclc = (struct smc_clc_msg_proposal *)&buf;
1301 rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1302 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1303 if (rc)
1304 goto out_decl;
1305
1306
1307 if (using_ipsec(new_smc)) {
1308 rc = SMC_CLC_DECL_IPSEC;
1309 goto out_decl;
1310 }
1311
1312
1313 rc = smc_listen_prfx_check(new_smc, pclc);
1314 if (rc)
1315 goto out_decl;
1316
1317
1318 if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) {
1319 rc = SMC_CLC_DECL_GETVLANERR;
1320 goto out_decl;
1321 }
1322
1323 mutex_lock(&smc_server_lgr_pending);
1324 smc_close_init(new_smc);
1325 smc_rx_init(new_smc);
1326 smc_tx_init(new_smc);
1327
1328
1329 if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) {
1330 ini.is_smcd = true;
1331 rc = smc_find_ism_device(new_smc, &ini);
1332 if (!rc)
1333 rc = smc_listen_ism_init(new_smc, pclc, &ini);
1334 if (!rc)
1335 ism_supported = true;
1336 else if (pclc->hdr.path == SMC_TYPE_D)
1337 goto out_unlock;
1338 }
1339
1340
1341 if (!ism_supported) {
1342
1343 ini.is_smcd = false;
1344 ini.ism_dev = NULL;
1345 ini.ib_lcl = &pclc->lcl;
1346 rc = smc_find_rdma_device(new_smc, &ini);
1347 if (rc) {
1348
1349 if (pclc->hdr.path == SMC_TYPE_B)
1350
1351 rc = SMC_CLC_DECL_NOSMCDEV;
1352 goto out_unlock;
1353 }
1354 rc = smc_listen_rdma_init(new_smc, &ini);
1355 if (rc)
1356 goto out_unlock;
1357 rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact);
1358 if (rc)
1359 goto out_unlock;
1360 }
1361
1362
1363 rc = smc_clc_send_accept(new_smc, ini.cln_first_contact);
1364 if (rc)
1365 goto out_unlock;
1366
1367
1368 if (ism_supported)
1369 mutex_unlock(&smc_server_lgr_pending);
1370
1371
1372 rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1373 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1374 if (rc) {
1375 if (!ism_supported)
1376 goto out_unlock;
1377 goto out_decl;
1378 }
1379
1380
1381 if (!ism_supported) {
1382 rc = smc_listen_rdma_finish(new_smc, &cclc,
1383 ini.cln_first_contact);
1384 mutex_unlock(&smc_server_lgr_pending);
1385 if (rc)
1386 return;
1387 }
1388 smc_conn_save_peer_info(new_smc, &cclc);
1389 smc_listen_out_connected(new_smc);
1390 return;
1391
1392out_unlock:
1393 mutex_unlock(&smc_server_lgr_pending);
1394out_decl:
1395 smc_listen_decline(new_smc, rc, ini.cln_first_contact);
1396}
1397
1398static void smc_tcp_listen_work(struct work_struct *work)
1399{
1400 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1401 tcp_listen_work);
1402 struct sock *lsk = &lsmc->sk;
1403 struct smc_sock *new_smc;
1404 int rc = 0;
1405
1406 lock_sock(lsk);
1407 while (lsk->sk_state == SMC_LISTEN) {
1408 rc = smc_clcsock_accept(lsmc, &new_smc);
1409 if (rc)
1410 goto out;
1411 if (!new_smc)
1412 continue;
1413
1414 new_smc->listen_smc = lsmc;
1415 new_smc->use_fallback = lsmc->use_fallback;
1416 new_smc->fallback_rsn = lsmc->fallback_rsn;
1417 sock_hold(lsk);
1418 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1419 smc_copy_sock_settings_to_smc(new_smc);
1420 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1421 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1422 sock_hold(&new_smc->sk);
1423 if (!schedule_work(&new_smc->smc_listen_work))
1424 sock_put(&new_smc->sk);
1425 }
1426
1427out:
1428 release_sock(lsk);
1429 sock_put(&lsmc->sk);
1430}
1431
1432static int smc_listen(struct socket *sock, int backlog)
1433{
1434 struct sock *sk = sock->sk;
1435 struct smc_sock *smc;
1436 int rc;
1437
1438 smc = smc_sk(sk);
1439 lock_sock(sk);
1440
1441 rc = -EINVAL;
1442 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1443 smc->connect_nonblock)
1444 goto out;
1445
1446 rc = 0;
1447 if (sk->sk_state == SMC_LISTEN) {
1448 sk->sk_max_ack_backlog = backlog;
1449 goto out;
1450 }
1451
1452
1453
1454 smc_copy_sock_settings_to_clc(smc);
1455 if (!smc->use_fallback)
1456 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1457
1458 rc = kernel_listen(smc->clcsock, backlog);
1459 if (rc)
1460 goto out;
1461 sk->sk_max_ack_backlog = backlog;
1462 sk->sk_ack_backlog = 0;
1463 sk->sk_state = SMC_LISTEN;
1464 sock_hold(sk);
1465 if (!schedule_work(&smc->tcp_listen_work))
1466 sock_put(sk);
1467
1468out:
1469 release_sock(sk);
1470 return rc;
1471}
1472
1473static int smc_accept(struct socket *sock, struct socket *new_sock,
1474 int flags, bool kern)
1475{
1476 struct sock *sk = sock->sk, *nsk;
1477 DECLARE_WAITQUEUE(wait, current);
1478 struct smc_sock *lsmc;
1479 long timeo;
1480 int rc = 0;
1481
1482 lsmc = smc_sk(sk);
1483 sock_hold(sk);
1484 lock_sock(sk);
1485
1486 if (lsmc->sk.sk_state != SMC_LISTEN) {
1487 rc = -EINVAL;
1488 release_sock(sk);
1489 goto out;
1490 }
1491
1492
1493 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1494 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1495 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1496 set_current_state(TASK_INTERRUPTIBLE);
1497 if (!timeo) {
1498 rc = -EAGAIN;
1499 break;
1500 }
1501 release_sock(sk);
1502 timeo = schedule_timeout(timeo);
1503
1504 sched_annotate_sleep();
1505 lock_sock(sk);
1506 if (signal_pending(current)) {
1507 rc = sock_intr_errno(timeo);
1508 break;
1509 }
1510 }
1511 set_current_state(TASK_RUNNING);
1512 remove_wait_queue(sk_sleep(sk), &wait);
1513
1514 if (!rc)
1515 rc = sock_error(nsk);
1516 release_sock(sk);
1517 if (rc)
1518 goto out;
1519
1520 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1521
1522 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1523 MSEC_PER_SEC);
1524 if (smc_sk(nsk)->use_fallback) {
1525 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1526
1527 lock_sock(clcsk);
1528 if (skb_queue_empty(&clcsk->sk_receive_queue))
1529 sk_wait_data(clcsk, &timeo, NULL);
1530 release_sock(clcsk);
1531 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1532 lock_sock(nsk);
1533 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1534 release_sock(nsk);
1535 }
1536 }
1537
1538out:
1539 sock_put(sk);
1540 return rc;
1541}
1542
1543static int smc_getname(struct socket *sock, struct sockaddr *addr,
1544 int peer)
1545{
1546 struct smc_sock *smc;
1547
1548 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1549 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1550 return -ENOTCONN;
1551
1552 smc = smc_sk(sock->sk);
1553
1554 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1555}
1556
1557static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1558{
1559 struct sock *sk = sock->sk;
1560 struct smc_sock *smc;
1561 int rc = -EPIPE;
1562
1563 smc = smc_sk(sk);
1564 lock_sock(sk);
1565 if ((sk->sk_state != SMC_ACTIVE) &&
1566 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1567 (sk->sk_state != SMC_INIT))
1568 goto out;
1569
1570 if (msg->msg_flags & MSG_FASTOPEN) {
1571 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1572 smc_switch_to_fallback(smc);
1573 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1574 } else {
1575 rc = -EINVAL;
1576 goto out;
1577 }
1578 }
1579
1580 if (smc->use_fallback)
1581 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1582 else
1583 rc = smc_tx_sendmsg(smc, msg, len);
1584out:
1585 release_sock(sk);
1586 return rc;
1587}
1588
1589static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1590 int flags)
1591{
1592 struct sock *sk = sock->sk;
1593 struct smc_sock *smc;
1594 int rc = -ENOTCONN;
1595
1596 smc = smc_sk(sk);
1597 lock_sock(sk);
1598 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1599
1600 rc = 0;
1601 goto out;
1602 }
1603 if ((sk->sk_state == SMC_INIT) ||
1604 (sk->sk_state == SMC_LISTEN) ||
1605 (sk->sk_state == SMC_CLOSED))
1606 goto out;
1607
1608 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1609 rc = 0;
1610 goto out;
1611 }
1612
1613 if (smc->use_fallback) {
1614 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1615 } else {
1616 msg->msg_namelen = 0;
1617 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1618 }
1619
1620out:
1621 release_sock(sk);
1622 return rc;
1623}
1624
1625static __poll_t smc_accept_poll(struct sock *parent)
1626{
1627 struct smc_sock *isk = smc_sk(parent);
1628 __poll_t mask = 0;
1629
1630 spin_lock(&isk->accept_q_lock);
1631 if (!list_empty(&isk->accept_q))
1632 mask = EPOLLIN | EPOLLRDNORM;
1633 spin_unlock(&isk->accept_q_lock);
1634
1635 return mask;
1636}
1637
1638static __poll_t smc_poll(struct file *file, struct socket *sock,
1639 poll_table *wait)
1640{
1641 struct sock *sk = sock->sk;
1642 struct smc_sock *smc;
1643 __poll_t mask = 0;
1644
1645 if (!sk)
1646 return EPOLLNVAL;
1647
1648 smc = smc_sk(sock->sk);
1649 if (smc->use_fallback) {
1650
1651 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1652 sk->sk_err = smc->clcsock->sk->sk_err;
1653 } else {
1654 if (sk->sk_state != SMC_CLOSED)
1655 sock_poll_wait(file, sock, wait);
1656 if (sk->sk_err)
1657 mask |= EPOLLERR;
1658 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1659 (sk->sk_state == SMC_CLOSED))
1660 mask |= EPOLLHUP;
1661 if (sk->sk_state == SMC_LISTEN) {
1662
1663 mask |= smc_accept_poll(sk);
1664 } else if (smc->use_fallback) {
1665 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
1666 wait);
1667 sk->sk_err = smc->clcsock->sk->sk_err;
1668 } else {
1669 if ((sk->sk_state != SMC_INIT &&
1670 atomic_read(&smc->conn.sndbuf_space)) ||
1671 sk->sk_shutdown & SEND_SHUTDOWN) {
1672 mask |= EPOLLOUT | EPOLLWRNORM;
1673 } else {
1674 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1675 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1676 }
1677 if (atomic_read(&smc->conn.bytes_to_rcv))
1678 mask |= EPOLLIN | EPOLLRDNORM;
1679 if (sk->sk_shutdown & RCV_SHUTDOWN)
1680 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1681 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1682 mask |= EPOLLIN;
1683 if (smc->conn.urg_state == SMC_URG_VALID)
1684 mask |= EPOLLPRI;
1685 }
1686 }
1687
1688 return mask;
1689}
1690
1691static int smc_shutdown(struct socket *sock, int how)
1692{
1693 struct sock *sk = sock->sk;
1694 struct smc_sock *smc;
1695 int rc = -EINVAL;
1696 int rc1 = 0;
1697
1698 smc = smc_sk(sk);
1699
1700 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1701 return rc;
1702
1703 lock_sock(sk);
1704
1705 rc = -ENOTCONN;
1706 if ((sk->sk_state != SMC_ACTIVE) &&
1707 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1708 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1709 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1710 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1711 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1712 goto out;
1713 if (smc->use_fallback) {
1714 rc = kernel_sock_shutdown(smc->clcsock, how);
1715 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1716 if (sk->sk_shutdown == SHUTDOWN_MASK)
1717 sk->sk_state = SMC_CLOSED;
1718 goto out;
1719 }
1720 switch (how) {
1721 case SHUT_RDWR:
1722 rc = smc_close_active(smc);
1723 break;
1724 case SHUT_WR:
1725 rc = smc_close_shutdown_write(smc);
1726 break;
1727 case SHUT_RD:
1728 rc = 0;
1729
1730 break;
1731 }
1732 if (smc->clcsock)
1733 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1734
1735 sk->sk_shutdown |= how + 1;
1736
1737out:
1738 release_sock(sk);
1739 return rc ? rc : rc1;
1740}
1741
1742static int smc_setsockopt(struct socket *sock, int level, int optname,
1743 sockptr_t optval, unsigned int optlen)
1744{
1745 struct sock *sk = sock->sk;
1746 struct smc_sock *smc;
1747 int val, rc;
1748
1749 smc = smc_sk(sk);
1750
1751
1752
1753
1754 if (unlikely(!smc->clcsock->ops->setsockopt))
1755 rc = -EOPNOTSUPP;
1756 else
1757 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1758 optval, optlen);
1759 if (smc->clcsock->sk->sk_err) {
1760 sk->sk_err = smc->clcsock->sk->sk_err;
1761 sk->sk_error_report(sk);
1762 }
1763
1764 if (optlen < sizeof(int))
1765 return -EINVAL;
1766 if (copy_from_sockptr(&val, optval, sizeof(int)))
1767 return -EFAULT;
1768
1769 lock_sock(sk);
1770 if (rc || smc->use_fallback)
1771 goto out;
1772 switch (optname) {
1773 case TCP_ULP:
1774 case TCP_FASTOPEN:
1775 case TCP_FASTOPEN_CONNECT:
1776 case TCP_FASTOPEN_KEY:
1777 case TCP_FASTOPEN_NO_COOKIE:
1778
1779 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1780 smc_switch_to_fallback(smc);
1781 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1782 } else {
1783 rc = -EINVAL;
1784 }
1785 break;
1786 case TCP_NODELAY:
1787 if (sk->sk_state != SMC_INIT &&
1788 sk->sk_state != SMC_LISTEN &&
1789 sk->sk_state != SMC_CLOSED) {
1790 if (val)
1791 mod_delayed_work(system_wq, &smc->conn.tx_work,
1792 0);
1793 }
1794 break;
1795 case TCP_CORK:
1796 if (sk->sk_state != SMC_INIT &&
1797 sk->sk_state != SMC_LISTEN &&
1798 sk->sk_state != SMC_CLOSED) {
1799 if (!val)
1800 mod_delayed_work(system_wq, &smc->conn.tx_work,
1801 0);
1802 }
1803 break;
1804 case TCP_DEFER_ACCEPT:
1805 smc->sockopt_defer_accept = val;
1806 break;
1807 default:
1808 break;
1809 }
1810out:
1811 release_sock(sk);
1812
1813 return rc;
1814}
1815
1816static int smc_getsockopt(struct socket *sock, int level, int optname,
1817 char __user *optval, int __user *optlen)
1818{
1819 struct smc_sock *smc;
1820
1821 smc = smc_sk(sock->sk);
1822
1823 if (unlikely(!smc->clcsock->ops->getsockopt))
1824 return -EOPNOTSUPP;
1825 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1826 optval, optlen);
1827}
1828
1829static int smc_ioctl(struct socket *sock, unsigned int cmd,
1830 unsigned long arg)
1831{
1832 union smc_host_cursor cons, urg;
1833 struct smc_connection *conn;
1834 struct smc_sock *smc;
1835 int answ;
1836
1837 smc = smc_sk(sock->sk);
1838 conn = &smc->conn;
1839 lock_sock(&smc->sk);
1840 if (smc->use_fallback) {
1841 if (!smc->clcsock) {
1842 release_sock(&smc->sk);
1843 return -EBADF;
1844 }
1845 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1846 release_sock(&smc->sk);
1847 return answ;
1848 }
1849 switch (cmd) {
1850 case SIOCINQ:
1851 if (smc->sk.sk_state == SMC_LISTEN) {
1852 release_sock(&smc->sk);
1853 return -EINVAL;
1854 }
1855 if (smc->sk.sk_state == SMC_INIT ||
1856 smc->sk.sk_state == SMC_CLOSED)
1857 answ = 0;
1858 else
1859 answ = atomic_read(&smc->conn.bytes_to_rcv);
1860 break;
1861 case SIOCOUTQ:
1862
1863 if (smc->sk.sk_state == SMC_LISTEN) {
1864 release_sock(&smc->sk);
1865 return -EINVAL;
1866 }
1867 if (smc->sk.sk_state == SMC_INIT ||
1868 smc->sk.sk_state == SMC_CLOSED)
1869 answ = 0;
1870 else
1871 answ = smc->conn.sndbuf_desc->len -
1872 atomic_read(&smc->conn.sndbuf_space);
1873 break;
1874 case SIOCOUTQNSD:
1875
1876 if (smc->sk.sk_state == SMC_LISTEN) {
1877 release_sock(&smc->sk);
1878 return -EINVAL;
1879 }
1880 if (smc->sk.sk_state == SMC_INIT ||
1881 smc->sk.sk_state == SMC_CLOSED)
1882 answ = 0;
1883 else
1884 answ = smc_tx_prepared_sends(&smc->conn);
1885 break;
1886 case SIOCATMARK:
1887 if (smc->sk.sk_state == SMC_LISTEN) {
1888 release_sock(&smc->sk);
1889 return -EINVAL;
1890 }
1891 if (smc->sk.sk_state == SMC_INIT ||
1892 smc->sk.sk_state == SMC_CLOSED) {
1893 answ = 0;
1894 } else {
1895 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1896 smc_curs_copy(&urg, &conn->urg_curs, conn);
1897 answ = smc_curs_diff(conn->rmb_desc->len,
1898 &cons, &urg) == 1;
1899 }
1900 break;
1901 default:
1902 release_sock(&smc->sk);
1903 return -ENOIOCTLCMD;
1904 }
1905 release_sock(&smc->sk);
1906
1907 return put_user(answ, (int __user *)arg);
1908}
1909
1910static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1911 int offset, size_t size, int flags)
1912{
1913 struct sock *sk = sock->sk;
1914 struct smc_sock *smc;
1915 int rc = -EPIPE;
1916
1917 smc = smc_sk(sk);
1918 lock_sock(sk);
1919 if (sk->sk_state != SMC_ACTIVE) {
1920 release_sock(sk);
1921 goto out;
1922 }
1923 release_sock(sk);
1924 if (smc->use_fallback)
1925 rc = kernel_sendpage(smc->clcsock, page, offset,
1926 size, flags);
1927 else
1928 rc = sock_no_sendpage(sock, page, offset, size, flags);
1929
1930out:
1931 return rc;
1932}
1933
1934
1935
1936
1937
1938
1939
1940static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1941 struct pipe_inode_info *pipe, size_t len,
1942 unsigned int flags)
1943{
1944 struct sock *sk = sock->sk;
1945 struct smc_sock *smc;
1946 int rc = -ENOTCONN;
1947
1948 smc = smc_sk(sk);
1949 lock_sock(sk);
1950 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1951
1952 rc = 0;
1953 goto out;
1954 }
1955 if (sk->sk_state == SMC_INIT ||
1956 sk->sk_state == SMC_LISTEN ||
1957 sk->sk_state == SMC_CLOSED)
1958 goto out;
1959
1960 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1961 rc = 0;
1962 goto out;
1963 }
1964
1965 if (smc->use_fallback) {
1966 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1967 pipe, len, flags);
1968 } else {
1969 if (*ppos) {
1970 rc = -ESPIPE;
1971 goto out;
1972 }
1973 if (flags & SPLICE_F_NONBLOCK)
1974 flags = MSG_DONTWAIT;
1975 else
1976 flags = 0;
1977 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1978 }
1979out:
1980 release_sock(sk);
1981
1982 return rc;
1983}
1984
1985
1986static const struct proto_ops smc_sock_ops = {
1987 .family = PF_SMC,
1988 .owner = THIS_MODULE,
1989 .release = smc_release,
1990 .bind = smc_bind,
1991 .connect = smc_connect,
1992 .socketpair = sock_no_socketpair,
1993 .accept = smc_accept,
1994 .getname = smc_getname,
1995 .poll = smc_poll,
1996 .ioctl = smc_ioctl,
1997 .listen = smc_listen,
1998 .shutdown = smc_shutdown,
1999 .setsockopt = smc_setsockopt,
2000 .getsockopt = smc_getsockopt,
2001 .sendmsg = smc_sendmsg,
2002 .recvmsg = smc_recvmsg,
2003 .mmap = sock_no_mmap,
2004 .sendpage = smc_sendpage,
2005 .splice_read = smc_splice_read,
2006};
2007
2008static int smc_create(struct net *net, struct socket *sock, int protocol,
2009 int kern)
2010{
2011 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
2012 struct smc_sock *smc;
2013 struct sock *sk;
2014 int rc;
2015
2016 rc = -ESOCKTNOSUPPORT;
2017 if (sock->type != SOCK_STREAM)
2018 goto out;
2019
2020 rc = -EPROTONOSUPPORT;
2021 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
2022 goto out;
2023
2024 rc = -ENOBUFS;
2025 sock->ops = &smc_sock_ops;
2026 sk = smc_sock_alloc(net, sock, protocol);
2027 if (!sk)
2028 goto out;
2029
2030
2031 smc = smc_sk(sk);
2032 smc->use_fallback = false;
2033 smc->fallback_rsn = 0;
2034 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2035 &smc->clcsock);
2036 if (rc) {
2037 sk_common_release(sk);
2038 goto out;
2039 }
2040 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2041 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
2042
2043out:
2044 return rc;
2045}
2046
2047static const struct net_proto_family smc_sock_family_ops = {
2048 .family = PF_SMC,
2049 .owner = THIS_MODULE,
2050 .create = smc_create,
2051};
2052
2053unsigned int smc_net_id;
2054
2055static __net_init int smc_net_init(struct net *net)
2056{
2057 return smc_pnet_net_init(net);
2058}
2059
2060static void __net_exit smc_net_exit(struct net *net)
2061{
2062 smc_pnet_net_exit(net);
2063}
2064
2065static struct pernet_operations smc_net_ops = {
2066 .init = smc_net_init,
2067 .exit = smc_net_exit,
2068 .id = &smc_net_id,
2069 .size = sizeof(struct smc_net),
2070};
2071
2072static int __init smc_init(void)
2073{
2074 int rc;
2075
2076 rc = register_pernet_subsys(&smc_net_ops);
2077 if (rc)
2078 return rc;
2079
2080 rc = smc_pnet_init();
2081 if (rc)
2082 goto out_pernet_subsys;
2083
2084 rc = smc_core_init();
2085 if (rc) {
2086 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
2087 goto out_pnet;
2088 }
2089
2090 rc = smc_llc_init();
2091 if (rc) {
2092 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2093 goto out_core;
2094 }
2095
2096 rc = smc_cdc_init();
2097 if (rc) {
2098 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2099 goto out_core;
2100 }
2101
2102 rc = proto_register(&smc_proto, 1);
2103 if (rc) {
2104 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2105 goto out_core;
2106 }
2107
2108 rc = proto_register(&smc_proto6, 1);
2109 if (rc) {
2110 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2111 goto out_proto;
2112 }
2113
2114 rc = sock_register(&smc_sock_family_ops);
2115 if (rc) {
2116 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2117 goto out_proto6;
2118 }
2119 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2120 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2121
2122 rc = smc_ib_register_client();
2123 if (rc) {
2124 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2125 goto out_sock;
2126 }
2127
2128 static_branch_enable(&tcp_have_smc);
2129 return 0;
2130
2131out_sock:
2132 sock_unregister(PF_SMC);
2133out_proto6:
2134 proto_unregister(&smc_proto6);
2135out_proto:
2136 proto_unregister(&smc_proto);
2137out_core:
2138 smc_core_exit();
2139out_pnet:
2140 smc_pnet_exit();
2141out_pernet_subsys:
2142 unregister_pernet_subsys(&smc_net_ops);
2143
2144 return rc;
2145}
2146
2147static void __exit smc_exit(void)
2148{
2149 static_branch_disable(&tcp_have_smc);
2150 sock_unregister(PF_SMC);
2151 smc_core_exit();
2152 smc_ib_unregister_client();
2153 proto_unregister(&smc_proto6);
2154 proto_unregister(&smc_proto);
2155 smc_pnet_exit();
2156 unregister_pernet_subsys(&smc_net_ops);
2157 rcu_barrier();
2158}
2159
2160module_init(smc_init);
2161module_exit(smc_exit);
2162
2163MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2164MODULE_DESCRIPTION("smc socket address family");
2165MODULE_LICENSE("GPL");
2166MODULE_ALIAS_NETPROTO(PF_SMC);
2167