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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
47static DEFINE_MUTEX(smc_create_lgr_pending);
48
49
50
51struct smc_lgr_list smc_lgr_list = {
52 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
53 .list = LIST_HEAD_INIT(smc_lgr_list.list),
54};
55
56static void smc_tcp_listen_work(struct work_struct *);
57
58static 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
65static struct smc_hashinfo smc_v4_hashinfo = {
66 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
67};
68
69int 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}
83EXPORT_SYMBOL_GPL(smc_hash_sk);
84
85void 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}
94EXPORT_SYMBOL_GPL(smc_unhash_sk);
95
96struct 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_TYPESAFE_BY_RCU,
105};
106EXPORT_SYMBOL_GPL(smc_proto);
107
108static 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
121
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
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 release_sock(sk);
151
152 sock_put(sk);
153out:
154 return rc;
155}
156
157static void smc_destruct(struct sock *sk)
158{
159 if (sk->sk_state != SMC_CLOSED)
160 return;
161 if (!sock_flag(sk, SOCK_DEAD))
162 return;
163
164 sk_refcnt_debug_dec(sk);
165}
166
167static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
168{
169 struct smc_sock *smc;
170 struct sock *sk;
171
172 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
173 if (!sk)
174 return NULL;
175
176 sock_init_data(sock, sk);
177 sk->sk_state = SMC_INIT;
178 sk->sk_destruct = smc_destruct;
179 sk->sk_protocol = SMCPROTO_SMC;
180 smc = smc_sk(sk);
181 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
182 INIT_LIST_HEAD(&smc->accept_q);
183 spin_lock_init(&smc->accept_q_lock);
184 INIT_DELAYED_WORK(&smc->sock_put_work, smc_close_sock_put_work);
185 sk->sk_prot->hash(sk);
186 sk_refcnt_debug_inc(sk);
187
188 return sk;
189}
190
191static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
192 int addr_len)
193{
194 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
195 struct sock *sk = sock->sk;
196 struct smc_sock *smc;
197 int rc;
198
199 smc = smc_sk(sk);
200
201
202 rc = -EINVAL;
203 if (addr_len < sizeof(struct sockaddr_in))
204 goto out;
205
206 rc = -EAFNOSUPPORT;
207
208 if ((addr->sin_family != AF_INET) &&
209 ((addr->sin_family != AF_UNSPEC) ||
210 (addr->sin_addr.s_addr != htonl(INADDR_ANY))))
211 goto out;
212
213 lock_sock(sk);
214
215
216 rc = -EINVAL;
217 if (sk->sk_state != SMC_INIT)
218 goto out_rel;
219
220 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
221 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
222
223out_rel:
224 release_sock(sk);
225out:
226 return rc;
227}
228
229static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
230 unsigned long mask)
231{
232
233 nsk->sk_type = osk->sk_type;
234 nsk->sk_sndbuf = osk->sk_sndbuf;
235 nsk->sk_rcvbuf = osk->sk_rcvbuf;
236 nsk->sk_sndtimeo = osk->sk_sndtimeo;
237 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
238 nsk->sk_mark = osk->sk_mark;
239 nsk->sk_priority = osk->sk_priority;
240 nsk->sk_rcvlowat = osk->sk_rcvlowat;
241 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
242 nsk->sk_err = osk->sk_err;
243
244 nsk->sk_flags &= ~mask;
245 nsk->sk_flags |= osk->sk_flags & mask;
246}
247
248#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
249 (1UL << SOCK_KEEPOPEN) | \
250 (1UL << SOCK_LINGER) | \
251 (1UL << SOCK_BROADCAST) | \
252 (1UL << SOCK_TIMESTAMP) | \
253 (1UL << SOCK_DBG) | \
254 (1UL << SOCK_RCVTSTAMP) | \
255 (1UL << SOCK_RCVTSTAMPNS) | \
256 (1UL << SOCK_LOCALROUTE) | \
257 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
258 (1UL << SOCK_RXQ_OVFL) | \
259 (1UL << SOCK_WIFI_STATUS) | \
260 (1UL << SOCK_NOFCS) | \
261 (1UL << SOCK_FILTER_LOCKED))
262
263
264
265static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
266{
267 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
268}
269
270#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
271 (1UL << SOCK_KEEPOPEN) | \
272 (1UL << SOCK_LINGER) | \
273 (1UL << SOCK_DBG))
274
275static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
276{
277 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
278}
279
280
281int smc_netinfo_by_tcpsk(struct socket *clcsock,
282 __be32 *subnet, u8 *prefix_len)
283{
284 struct dst_entry *dst = sk_dst_get(clcsock->sk);
285 struct sockaddr_in addr;
286 int rc = -ENOENT;
287 int len;
288
289 if (!dst) {
290 rc = -ENOTCONN;
291 goto out;
292 }
293 if (!dst->dev) {
294 rc = -ENODEV;
295 goto out_rel;
296 }
297
298
299 kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len);
300
301 for_ifa(dst->dev->ip_ptr) {
302 if (ifa->ifa_address != addr.sin_addr.s_addr)
303 continue;
304 *prefix_len = inet_mask_len(ifa->ifa_mask);
305 *subnet = ifa->ifa_address & ifa->ifa_mask;
306 rc = 0;
307 break;
308 } endfor_ifa(dst->dev->ip_ptr);
309
310out_rel:
311 dst_release(dst);
312out:
313 return rc;
314}
315
316static int smc_clnt_conf_first_link(struct smc_sock *smc, union ib_gid *gid)
317{
318 struct smc_link_group *lgr = smc->conn.lgr;
319 struct smc_link *link;
320 int rest;
321 int rc;
322
323 link = &lgr->lnk[SMC_SINGLE_LINK];
324
325 rest = wait_for_completion_interruptible_timeout(
326 &link->llc_confirm,
327 SMC_LLC_WAIT_FIRST_TIME);
328 if (rest <= 0) {
329 struct smc_clc_msg_decline dclc;
330
331 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
332 SMC_CLC_DECLINE);
333 return rc;
334 }
335
336 rc = smc_ib_modify_qp_rts(link);
337 if (rc)
338 return SMC_CLC_DECL_INTERR;
339
340 smc_wr_remember_qp_attr(link);
341
342 rc = smc_llc_send_confirm_link(link,
343 link->smcibdev->mac[link->ibport - 1],
344 gid, SMC_LLC_RESP);
345 if (rc < 0)
346 return SMC_CLC_DECL_TCL;
347
348 return rc;
349}
350
351static void smc_conn_save_peer_info(struct smc_sock *smc,
352 struct smc_clc_msg_accept_confirm *clc)
353{
354 smc->conn.peer_conn_idx = clc->conn_idx;
355 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
356 smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
357 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
358}
359
360static void smc_link_save_peer_info(struct smc_link *link,
361 struct smc_clc_msg_accept_confirm *clc)
362{
363 link->peer_qpn = ntoh24(clc->qpn);
364 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
365 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
366 link->peer_psn = ntoh24(clc->psn);
367 link->peer_mtu = clc->qp_mtu;
368}
369
370
371static int smc_connect_rdma(struct smc_sock *smc)
372{
373 struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr;
374 struct smc_clc_msg_accept_confirm aclc;
375 int local_contact = SMC_FIRST_CONTACT;
376 struct smc_ib_device *smcibdev;
377 struct smc_link *link;
378 u8 srv_first_contact;
379 int reason_code = 0;
380 int rc = 0;
381 u8 ibport;
382
383
384 if (using_ipsec(smc)) {
385 reason_code = SMC_CLC_DECL_IPSEC;
386 goto decline_rdma;
387 }
388
389
390
391
392
393 smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
394 if (!smcibdev) {
395 reason_code = SMC_CLC_DECL_CNFERR;
396 goto decline_rdma;
397 }
398
399
400 reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
401 if (reason_code < 0) {
402 rc = reason_code;
403 goto out_err;
404 }
405 if (reason_code > 0)
406 goto decline_rdma;
407
408 reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
409 SMC_CLC_ACCEPT);
410 if (reason_code < 0) {
411 rc = reason_code;
412 goto out_err;
413 }
414 if (reason_code > 0)
415 goto decline_rdma;
416
417 srv_first_contact = aclc.hdr.flag;
418 mutex_lock(&smc_create_lgr_pending);
419 local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev,
420 ibport, &aclc.lcl, srv_first_contact);
421 if (local_contact < 0) {
422 rc = local_contact;
423 if (rc == -ENOMEM)
424 reason_code = SMC_CLC_DECL_MEM;
425 else if (rc == -ENOLINK)
426 reason_code = SMC_CLC_DECL_SYNCERR;
427 goto decline_rdma_unlock;
428 }
429 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
430
431 smc_conn_save_peer_info(smc, &aclc);
432
433 rc = smc_sndbuf_create(smc);
434 if (rc) {
435 reason_code = SMC_CLC_DECL_MEM;
436 goto decline_rdma_unlock;
437 }
438 rc = smc_rmb_create(smc);
439 if (rc) {
440 reason_code = SMC_CLC_DECL_MEM;
441 goto decline_rdma_unlock;
442 }
443
444 if (local_contact == SMC_FIRST_CONTACT)
445 smc_link_save_peer_info(link, &aclc);
446
447 rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
448 if (rc) {
449 reason_code = SMC_CLC_DECL_INTERR;
450 goto decline_rdma_unlock;
451 }
452
453 smc_close_init(smc);
454 smc_rx_init(smc);
455
456 if (local_contact == SMC_FIRST_CONTACT) {
457 rc = smc_ib_ready_link(link);
458 if (rc) {
459 reason_code = SMC_CLC_DECL_INTERR;
460 goto decline_rdma_unlock;
461 }
462 }
463
464 rc = smc_clc_send_confirm(smc);
465 if (rc)
466 goto out_err_unlock;
467
468 if (local_contact == SMC_FIRST_CONTACT) {
469
470 reason_code = smc_clnt_conf_first_link(
471 smc, &smcibdev->gid[ibport - 1]);
472 if (reason_code < 0) {
473 rc = reason_code;
474 goto out_err_unlock;
475 }
476 if (reason_code > 0)
477 goto decline_rdma_unlock;
478 }
479
480 mutex_unlock(&smc_create_lgr_pending);
481 smc_tx_init(smc);
482
483out_connected:
484 smc_copy_sock_settings_to_clc(smc);
485 if (smc->sk.sk_state == SMC_INIT)
486 smc->sk.sk_state = SMC_ACTIVE;
487
488 return rc ? rc : local_contact;
489
490decline_rdma_unlock:
491 mutex_unlock(&smc_create_lgr_pending);
492 smc_conn_free(&smc->conn);
493decline_rdma:
494
495 smc->use_fallback = true;
496 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
497 rc = smc_clc_send_decline(smc, reason_code, 0);
498 if (rc < sizeof(struct smc_clc_msg_decline))
499 goto out_err;
500 }
501 goto out_connected;
502
503out_err_unlock:
504 mutex_unlock(&smc_create_lgr_pending);
505 smc_conn_free(&smc->conn);
506out_err:
507 return rc;
508}
509
510static int smc_connect(struct socket *sock, struct sockaddr *addr,
511 int alen, int flags)
512{
513 struct sock *sk = sock->sk;
514 struct smc_sock *smc;
515 int rc = -EINVAL;
516
517 smc = smc_sk(sk);
518
519
520 if (alen < sizeof(addr->sa_family))
521 goto out_err;
522 if (addr->sa_family != AF_INET)
523 goto out_err;
524 smc->addr = addr;
525
526 lock_sock(sk);
527 switch (sk->sk_state) {
528 default:
529 goto out;
530 case SMC_ACTIVE:
531 rc = -EISCONN;
532 goto out;
533 case SMC_INIT:
534 rc = 0;
535 break;
536 }
537
538 smc_copy_sock_settings_to_clc(smc);
539 rc = kernel_connect(smc->clcsock, addr, alen, flags);
540 if (rc)
541 goto out;
542
543
544 rc = smc_connect_rdma(smc);
545 if (rc < 0)
546 goto out;
547 else
548 rc = 0;
549
550out:
551 release_sock(sk);
552out_err:
553 return rc;
554}
555
556static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
557{
558 struct sock *sk = &lsmc->sk;
559 struct socket *new_clcsock;
560 struct sock *new_sk;
561 int rc;
562
563 release_sock(&lsmc->sk);
564 new_sk = smc_sock_alloc(sock_net(sk), NULL);
565 if (!new_sk) {
566 rc = -ENOMEM;
567 lsmc->sk.sk_err = ENOMEM;
568 *new_smc = NULL;
569 lock_sock(&lsmc->sk);
570 goto out;
571 }
572 *new_smc = smc_sk(new_sk);
573
574 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
575 lock_sock(&lsmc->sk);
576 if (rc < 0) {
577 lsmc->sk.sk_err = -rc;
578 new_sk->sk_state = SMC_CLOSED;
579 sock_set_flag(new_sk, SOCK_DEAD);
580 sk->sk_prot->unhash(new_sk);
581 sock_put(new_sk);
582 *new_smc = NULL;
583 goto out;
584 }
585 if (lsmc->sk.sk_state == SMC_CLOSED) {
586 if (new_clcsock)
587 sock_release(new_clcsock);
588 new_sk->sk_state = SMC_CLOSED;
589 sock_set_flag(new_sk, SOCK_DEAD);
590 sk->sk_prot->unhash(new_sk);
591 sock_put(new_sk);
592 *new_smc = NULL;
593 goto out;
594 }
595
596 (*new_smc)->clcsock = new_clcsock;
597out:
598 return rc;
599}
600
601
602
603
604static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
605{
606 struct smc_sock *par = smc_sk(parent);
607
608 sock_hold(sk);
609 spin_lock(&par->accept_q_lock);
610 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
611 spin_unlock(&par->accept_q_lock);
612 sk_acceptq_added(parent);
613}
614
615
616static void smc_accept_unlink(struct sock *sk)
617{
618 struct smc_sock *par = smc_sk(sk)->listen_smc;
619
620 spin_lock(&par->accept_q_lock);
621 list_del_init(&smc_sk(sk)->accept_q);
622 spin_unlock(&par->accept_q_lock);
623 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
624 sock_put(sk);
625}
626
627
628
629
630struct sock *smc_accept_dequeue(struct sock *parent,
631 struct socket *new_sock)
632{
633 struct smc_sock *isk, *n;
634 struct sock *new_sk;
635
636 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
637 new_sk = (struct sock *)isk;
638
639 smc_accept_unlink(new_sk);
640 if (new_sk->sk_state == SMC_CLOSED) {
641 new_sk->sk_prot->unhash(new_sk);
642 sock_put(new_sk);
643 continue;
644 }
645 if (new_sock)
646 sock_graft(new_sk, new_sock);
647 return new_sk;
648 }
649 return NULL;
650}
651
652
653void smc_close_non_accepted(struct sock *sk)
654{
655 struct smc_sock *smc = smc_sk(sk);
656
657 sock_hold(sk);
658 lock_sock(sk);
659 if (!sk->sk_lingertime)
660
661 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
662 if (smc->use_fallback) {
663 sk->sk_state = SMC_CLOSED;
664 } else {
665 smc_close_active(smc);
666 sock_set_flag(sk, SOCK_DEAD);
667 sk->sk_shutdown |= SHUTDOWN_MASK;
668 }
669 if (smc->clcsock) {
670 struct socket *tcp;
671
672 tcp = smc->clcsock;
673 smc->clcsock = NULL;
674 sock_release(tcp);
675 }
676 if (smc->use_fallback) {
677 schedule_delayed_work(&smc->sock_put_work, TCP_TIMEWAIT_LEN);
678 } else if (sk->sk_state == SMC_CLOSED) {
679 smc_conn_free(&smc->conn);
680 schedule_delayed_work(&smc->sock_put_work,
681 SMC_CLOSE_SOCK_PUT_DELAY);
682 }
683 release_sock(sk);
684 sock_put(sk);
685}
686
687static int smc_serv_conf_first_link(struct smc_sock *smc)
688{
689 struct smc_link_group *lgr = smc->conn.lgr;
690 struct smc_link *link;
691 int rest;
692 int rc;
693
694 link = &lgr->lnk[SMC_SINGLE_LINK];
695
696 rc = smc_llc_send_confirm_link(link,
697 link->smcibdev->mac[link->ibport - 1],
698 &link->smcibdev->gid[link->ibport - 1],
699 SMC_LLC_REQ);
700 if (rc < 0)
701 return SMC_CLC_DECL_TCL;
702
703
704 rest = wait_for_completion_interruptible_timeout(
705 &link->llc_confirm_resp,
706 SMC_LLC_WAIT_FIRST_TIME);
707 if (rest <= 0) {
708 struct smc_clc_msg_decline dclc;
709
710 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
711 SMC_CLC_DECLINE);
712 }
713
714 return rc;
715}
716
717
718static void smc_listen_work(struct work_struct *work)
719{
720 struct smc_sock *new_smc = container_of(work, struct smc_sock,
721 smc_listen_work);
722 struct socket *newclcsock = new_smc->clcsock;
723 struct smc_sock *lsmc = new_smc->listen_smc;
724 struct smc_clc_msg_accept_confirm cclc;
725 int local_contact = SMC_REUSE_CONTACT;
726 struct sock *newsmcsk = &new_smc->sk;
727 struct smc_clc_msg_proposal pclc;
728 struct smc_ib_device *smcibdev;
729 struct sockaddr_in peeraddr;
730 struct smc_link *link;
731 int reason_code = 0;
732 int rc = 0, len;
733 __be32 subnet;
734 u8 prefix_len;
735 u8 ibport;
736
737
738
739
740 reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc),
741 SMC_CLC_PROPOSAL);
742 if (reason_code < 0)
743 goto out_err;
744 if (reason_code > 0)
745 goto decline_rdma;
746
747
748 if (using_ipsec(new_smc)) {
749 reason_code = SMC_CLC_DECL_IPSEC;
750 goto decline_rdma;
751 }
752
753
754
755
756
757 smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
758 if (!smcibdev) {
759 reason_code = SMC_CLC_DECL_CNFERR;
760 goto decline_rdma;
761 }
762
763
764 rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len);
765 if (rc) {
766 reason_code = SMC_CLC_DECL_CNFERR;
767 goto decline_rdma;
768 }
769 if ((pclc.outgoing_subnet != subnet) ||
770 (pclc.prefix_len != prefix_len)) {
771 reason_code = SMC_CLC_DECL_CNFERR;
772 goto decline_rdma;
773 }
774
775
776 kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len);
777
778
779 mutex_lock(&smc_create_lgr_pending);
780 local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr,
781 smcibdev, ibport, &pclc.lcl, 0);
782 if (local_contact == SMC_REUSE_CONTACT)
783
784
785
786 mutex_unlock(&smc_create_lgr_pending);
787 if (local_contact < 0) {
788 rc = local_contact;
789 if (rc == -ENOMEM)
790 reason_code = SMC_CLC_DECL_MEM;
791 else if (rc == -ENOLINK)
792 reason_code = SMC_CLC_DECL_SYNCERR;
793 goto decline_rdma;
794 }
795 link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
796
797 rc = smc_sndbuf_create(new_smc);
798 if (rc) {
799 reason_code = SMC_CLC_DECL_MEM;
800 goto decline_rdma;
801 }
802 rc = smc_rmb_create(new_smc);
803 if (rc) {
804 reason_code = SMC_CLC_DECL_MEM;
805 goto decline_rdma;
806 }
807
808 smc_close_init(new_smc);
809 smc_rx_init(new_smc);
810
811 rc = smc_clc_send_accept(new_smc, local_contact);
812 if (rc)
813 goto out_err;
814
815
816 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
817 SMC_CLC_CONFIRM);
818 if (reason_code < 0)
819 goto out_err;
820 if (reason_code > 0)
821 goto decline_rdma;
822 smc_conn_save_peer_info(new_smc, &cclc);
823 if (local_contact == SMC_FIRST_CONTACT)
824 smc_link_save_peer_info(link, &cclc);
825
826 rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
827 if (rc) {
828 reason_code = SMC_CLC_DECL_INTERR;
829 goto decline_rdma;
830 }
831
832 if (local_contact == SMC_FIRST_CONTACT) {
833 rc = smc_ib_ready_link(link);
834 if (rc) {
835 reason_code = SMC_CLC_DECL_INTERR;
836 goto decline_rdma;
837 }
838
839 reason_code = smc_serv_conf_first_link(new_smc);
840 if (reason_code < 0) {
841
842 rc = reason_code;
843 goto out_err;
844 }
845 if (reason_code > 0)
846 goto decline_rdma;
847 }
848
849 smc_tx_init(new_smc);
850
851out_connected:
852 sk_refcnt_debug_inc(newsmcsk);
853 if (newsmcsk->sk_state == SMC_INIT)
854 newsmcsk->sk_state = SMC_ACTIVE;
855enqueue:
856 if (local_contact == SMC_FIRST_CONTACT)
857 mutex_unlock(&smc_create_lgr_pending);
858 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
859 if (lsmc->sk.sk_state == SMC_LISTEN) {
860 smc_accept_enqueue(&lsmc->sk, newsmcsk);
861 } else {
862 smc_close_non_accepted(newsmcsk);
863 }
864 release_sock(&lsmc->sk);
865
866
867 lsmc->sk.sk_data_ready(&lsmc->sk);
868 sock_put(&lsmc->sk);
869 return;
870
871decline_rdma:
872
873 smc_conn_free(&new_smc->conn);
874 new_smc->use_fallback = true;
875 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
876 rc = smc_clc_send_decline(new_smc, reason_code, 0);
877 if (rc < sizeof(struct smc_clc_msg_decline))
878 goto out_err;
879 }
880 goto out_connected;
881
882out_err:
883 newsmcsk->sk_state = SMC_CLOSED;
884 smc_conn_free(&new_smc->conn);
885 goto enqueue;
886}
887
888static void smc_tcp_listen_work(struct work_struct *work)
889{
890 struct smc_sock *lsmc = container_of(work, struct smc_sock,
891 tcp_listen_work);
892 struct smc_sock *new_smc;
893 int rc = 0;
894
895 lock_sock(&lsmc->sk);
896 while (lsmc->sk.sk_state == SMC_LISTEN) {
897 rc = smc_clcsock_accept(lsmc, &new_smc);
898 if (rc)
899 goto out;
900 if (!new_smc)
901 continue;
902
903 new_smc->listen_smc = lsmc;
904 new_smc->use_fallback = false;
905 sock_hold(&lsmc->sk);
906 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
907 smc_copy_sock_settings_to_smc(new_smc);
908 schedule_work(&new_smc->smc_listen_work);
909 }
910
911out:
912 release_sock(&lsmc->sk);
913 lsmc->sk.sk_data_ready(&lsmc->sk);
914}
915
916static int smc_listen(struct socket *sock, int backlog)
917{
918 struct sock *sk = sock->sk;
919 struct smc_sock *smc;
920 int rc;
921
922 smc = smc_sk(sk);
923 lock_sock(sk);
924
925 rc = -EINVAL;
926 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
927 goto out;
928
929 rc = 0;
930 if (sk->sk_state == SMC_LISTEN) {
931 sk->sk_max_ack_backlog = backlog;
932 goto out;
933 }
934
935
936
937 smc_copy_sock_settings_to_clc(smc);
938
939 rc = kernel_listen(smc->clcsock, backlog);
940 if (rc)
941 goto out;
942 sk->sk_max_ack_backlog = backlog;
943 sk->sk_ack_backlog = 0;
944 sk->sk_state = SMC_LISTEN;
945 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
946 schedule_work(&smc->tcp_listen_work);
947
948out:
949 release_sock(sk);
950 return rc;
951}
952
953static int smc_accept(struct socket *sock, struct socket *new_sock,
954 int flags, bool kern)
955{
956 struct sock *sk = sock->sk, *nsk;
957 DECLARE_WAITQUEUE(wait, current);
958 struct smc_sock *lsmc;
959 long timeo;
960 int rc = 0;
961
962 lsmc = smc_sk(sk);
963 lock_sock(sk);
964
965 if (lsmc->sk.sk_state != SMC_LISTEN) {
966 rc = -EINVAL;
967 goto out;
968 }
969
970
971 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
972 add_wait_queue_exclusive(sk_sleep(sk), &wait);
973 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
974 set_current_state(TASK_INTERRUPTIBLE);
975 if (!timeo) {
976 rc = -EAGAIN;
977 break;
978 }
979 release_sock(sk);
980 timeo = schedule_timeout(timeo);
981
982 sched_annotate_sleep();
983 lock_sock(sk);
984 if (signal_pending(current)) {
985 rc = sock_intr_errno(timeo);
986 break;
987 }
988 }
989 set_current_state(TASK_RUNNING);
990 remove_wait_queue(sk_sleep(sk), &wait);
991
992 if (!rc)
993 rc = sock_error(nsk);
994
995out:
996 release_sock(sk);
997 return rc;
998}
999
1000static int smc_getname(struct socket *sock, struct sockaddr *addr,
1001 int *len, int peer)
1002{
1003 struct smc_sock *smc;
1004
1005 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1006 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1007 return -ENOTCONN;
1008
1009 smc = smc_sk(sock->sk);
1010
1011 return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
1012}
1013
1014static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1015{
1016 struct sock *sk = sock->sk;
1017 struct smc_sock *smc;
1018 int rc = -EPIPE;
1019
1020 smc = smc_sk(sk);
1021 lock_sock(sk);
1022 if ((sk->sk_state != SMC_ACTIVE) &&
1023 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1024 (sk->sk_state != SMC_INIT))
1025 goto out;
1026 if (smc->use_fallback)
1027 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1028 else
1029 rc = smc_tx_sendmsg(smc, msg, len);
1030out:
1031 release_sock(sk);
1032 return rc;
1033}
1034
1035static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1036 int flags)
1037{
1038 struct sock *sk = sock->sk;
1039 struct smc_sock *smc;
1040 int rc = -ENOTCONN;
1041
1042 smc = smc_sk(sk);
1043 lock_sock(sk);
1044 if ((sk->sk_state == SMC_INIT) ||
1045 (sk->sk_state == SMC_LISTEN) ||
1046 (sk->sk_state == SMC_CLOSED))
1047 goto out;
1048
1049 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1050 rc = 0;
1051 goto out;
1052 }
1053
1054 if (smc->use_fallback)
1055 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1056 else
1057 rc = smc_rx_recvmsg(smc, msg, len, flags);
1058
1059out:
1060 release_sock(sk);
1061 return rc;
1062}
1063
1064static unsigned int smc_accept_poll(struct sock *parent)
1065{
1066 struct smc_sock *isk;
1067 struct sock *sk;
1068
1069 lock_sock(parent);
1070 list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) {
1071 sk = (struct sock *)isk;
1072
1073 if (sk->sk_state == SMC_ACTIVE) {
1074 release_sock(parent);
1075 return POLLIN | POLLRDNORM;
1076 }
1077 }
1078 release_sock(parent);
1079
1080 return 0;
1081}
1082
1083static unsigned int smc_poll(struct file *file, struct socket *sock,
1084 poll_table *wait)
1085{
1086 struct sock *sk = sock->sk;
1087 unsigned int mask = 0;
1088 struct smc_sock *smc;
1089 int rc;
1090
1091 smc = smc_sk(sock->sk);
1092 if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
1093
1094 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1095
1096 lock_sock(sk);
1097 if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) {
1098 sk->sk_err = smc->clcsock->sk->sk_err;
1099 if (sk->sk_err) {
1100 mask |= POLLERR;
1101 } else {
1102 rc = smc_connect_rdma(smc);
1103 if (rc < 0)
1104 mask |= POLLERR;
1105 else
1106
1107 mask |= POLLOUT | POLLWRNORM;
1108 }
1109 }
1110 release_sock(sk);
1111 } else {
1112 sock_poll_wait(file, sk_sleep(sk), wait);
1113 if (sk->sk_state == SMC_LISTEN)
1114
1115 mask |= smc_accept_poll(sk);
1116 if (sk->sk_err)
1117 mask |= POLLERR;
1118 if (atomic_read(&smc->conn.sndbuf_space) ||
1119 (sk->sk_shutdown & SEND_SHUTDOWN)) {
1120 mask |= POLLOUT | POLLWRNORM;
1121 } else {
1122 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1123 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1124 }
1125 if (atomic_read(&smc->conn.bytes_to_rcv))
1126 mask |= POLLIN | POLLRDNORM;
1127 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1128 (sk->sk_state == SMC_CLOSED))
1129 mask |= POLLHUP;
1130 if (sk->sk_shutdown & RCV_SHUTDOWN)
1131 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
1132 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1133 mask |= POLLIN;
1134
1135 }
1136
1137 return mask;
1138}
1139
1140static int smc_shutdown(struct socket *sock, int how)
1141{
1142 struct sock *sk = sock->sk;
1143 struct smc_sock *smc;
1144 int rc = -EINVAL;
1145 int rc1 = 0;
1146
1147 smc = smc_sk(sk);
1148
1149 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1150 return rc;
1151
1152 lock_sock(sk);
1153
1154 rc = -ENOTCONN;
1155 if ((sk->sk_state != SMC_LISTEN) &&
1156 (sk->sk_state != SMC_ACTIVE) &&
1157 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1158 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1159 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1160 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1161 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1162 goto out;
1163 if (smc->use_fallback) {
1164 rc = kernel_sock_shutdown(smc->clcsock, how);
1165 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1166 if (sk->sk_shutdown == SHUTDOWN_MASK)
1167 sk->sk_state = SMC_CLOSED;
1168 goto out;
1169 }
1170 switch (how) {
1171 case SHUT_RDWR:
1172 rc = smc_close_active(smc);
1173 break;
1174 case SHUT_WR:
1175 rc = smc_close_shutdown_write(smc);
1176 break;
1177 case SHUT_RD:
1178 if (sk->sk_state == SMC_LISTEN)
1179 rc = smc_close_active(smc);
1180 else
1181 rc = 0;
1182
1183 break;
1184 }
1185 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1186
1187 sk->sk_shutdown |= how + 1;
1188
1189out:
1190 release_sock(sk);
1191 return rc ? rc : rc1;
1192}
1193
1194static int smc_setsockopt(struct socket *sock, int level, int optname,
1195 char __user *optval, unsigned int optlen)
1196{
1197 struct sock *sk = sock->sk;
1198 struct smc_sock *smc;
1199
1200 smc = smc_sk(sk);
1201
1202
1203
1204
1205 return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1206 optval, optlen);
1207}
1208
1209static int smc_getsockopt(struct socket *sock, int level, int optname,
1210 char __user *optval, int __user *optlen)
1211{
1212 struct smc_sock *smc;
1213
1214 smc = smc_sk(sock->sk);
1215
1216 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1217 optval, optlen);
1218}
1219
1220static int smc_ioctl(struct socket *sock, unsigned int cmd,
1221 unsigned long arg)
1222{
1223 struct smc_sock *smc;
1224
1225 smc = smc_sk(sock->sk);
1226 if (smc->use_fallback)
1227 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1228 else
1229 return sock_no_ioctl(sock, cmd, arg);
1230}
1231
1232static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1233 int offset, size_t size, int flags)
1234{
1235 struct sock *sk = sock->sk;
1236 struct smc_sock *smc;
1237 int rc = -EPIPE;
1238
1239 smc = smc_sk(sk);
1240 lock_sock(sk);
1241 if (sk->sk_state != SMC_ACTIVE)
1242 goto out;
1243 if (smc->use_fallback)
1244 rc = kernel_sendpage(smc->clcsock, page, offset,
1245 size, flags);
1246 else
1247 rc = sock_no_sendpage(sock, page, offset, size, flags);
1248
1249out:
1250 release_sock(sk);
1251 return rc;
1252}
1253
1254static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1255 struct pipe_inode_info *pipe, size_t len,
1256 unsigned int flags)
1257{
1258 struct sock *sk = sock->sk;
1259 struct smc_sock *smc;
1260 int rc = -ENOTCONN;
1261
1262 smc = smc_sk(sk);
1263 lock_sock(sk);
1264 if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
1265 goto out;
1266 if (smc->use_fallback) {
1267 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1268 pipe, len, flags);
1269 } else {
1270 rc = -EOPNOTSUPP;
1271 }
1272out:
1273 release_sock(sk);
1274 return rc;
1275}
1276
1277
1278static const struct proto_ops smc_sock_ops = {
1279 .family = PF_SMC,
1280 .owner = THIS_MODULE,
1281 .release = smc_release,
1282 .bind = smc_bind,
1283 .connect = smc_connect,
1284 .socketpair = sock_no_socketpair,
1285 .accept = smc_accept,
1286 .getname = smc_getname,
1287 .poll = smc_poll,
1288 .ioctl = smc_ioctl,
1289 .listen = smc_listen,
1290 .shutdown = smc_shutdown,
1291 .setsockopt = smc_setsockopt,
1292 .getsockopt = smc_getsockopt,
1293 .sendmsg = smc_sendmsg,
1294 .recvmsg = smc_recvmsg,
1295 .mmap = sock_no_mmap,
1296 .sendpage = smc_sendpage,
1297 .splice_read = smc_splice_read,
1298};
1299
1300static int smc_create(struct net *net, struct socket *sock, int protocol,
1301 int kern)
1302{
1303 struct smc_sock *smc;
1304 struct sock *sk;
1305 int rc;
1306
1307 rc = -ESOCKTNOSUPPORT;
1308 if (sock->type != SOCK_STREAM)
1309 goto out;
1310
1311 rc = -EPROTONOSUPPORT;
1312 if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
1313 goto out;
1314
1315 rc = -ENOBUFS;
1316 sock->ops = &smc_sock_ops;
1317 sk = smc_sock_alloc(net, sock);
1318 if (!sk)
1319 goto out;
1320
1321
1322 smc = smc_sk(sk);
1323 smc->use_fallback = false;
1324 rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
1325 IPPROTO_TCP, &smc->clcsock);
1326 if (rc)
1327 sk_common_release(sk);
1328 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1329 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1330
1331out:
1332 return rc;
1333}
1334
1335static const struct net_proto_family smc_sock_family_ops = {
1336 .family = PF_SMC,
1337 .owner = THIS_MODULE,
1338 .create = smc_create,
1339};
1340
1341static int __init smc_init(void)
1342{
1343 int rc;
1344
1345 rc = smc_pnet_init();
1346 if (rc)
1347 return rc;
1348
1349 rc = smc_llc_init();
1350 if (rc) {
1351 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1352 goto out_pnet;
1353 }
1354
1355 rc = smc_cdc_init();
1356 if (rc) {
1357 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1358 goto out_pnet;
1359 }
1360
1361 rc = proto_register(&smc_proto, 1);
1362 if (rc) {
1363 pr_err("%s: proto_register fails with %d\n", __func__, rc);
1364 goto out_pnet;
1365 }
1366
1367 rc = sock_register(&smc_sock_family_ops);
1368 if (rc) {
1369 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1370 goto out_proto;
1371 }
1372 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1373
1374 rc = smc_ib_register_client();
1375 if (rc) {
1376 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1377 goto out_sock;
1378 }
1379
1380 return 0;
1381
1382out_sock:
1383 sock_unregister(PF_SMC);
1384out_proto:
1385 proto_unregister(&smc_proto);
1386out_pnet:
1387 smc_pnet_exit();
1388 return rc;
1389}
1390
1391static void __exit smc_exit(void)
1392{
1393 struct smc_link_group *lgr, *lg;
1394 LIST_HEAD(lgr_freeing_list);
1395
1396 spin_lock_bh(&smc_lgr_list.lock);
1397 if (!list_empty(&smc_lgr_list.list))
1398 list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1399 spin_unlock_bh(&smc_lgr_list.lock);
1400 list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1401 list_del_init(&lgr->list);
1402 smc_lgr_free(lgr);
1403 }
1404 smc_ib_unregister_client();
1405 sock_unregister(PF_SMC);
1406 proto_unregister(&smc_proto);
1407 smc_pnet_exit();
1408}
1409
1410module_init(smc_init);
1411module_exit(smc_exit);
1412
1413MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
1414MODULE_DESCRIPTION("smc socket address family");
1415MODULE_LICENSE("GPL");
1416MODULE_ALIAS_NETPROTO(PF_SMC);
1417
