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[mirror_ubuntu-eoan-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 * - support for alternate links postponed
11 * - partial support for non-blocking sockets only
12 * - support for urgent data postponed
13 *
14 * Copyright IBM Corp. 2016, 2018
15 *
16 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
17 * based on prototype from Frank Blaschka
18 */
19
20 #define KMSG_COMPONENT "smc"
21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
22
23 #include <linux/module.h>
24 #include <linux/socket.h>
25 #include <linux/workqueue.h>
26 #include <linux/in.h>
27 #include <linux/sched/signal.h>
28
29 #include <net/sock.h>
30 #include <net/tcp.h>
31 #include <net/smc.h>
32
33 #include "smc.h"
34 #include "smc_clc.h"
35 #include "smc_llc.h"
36 #include "smc_cdc.h"
37 #include "smc_core.h"
38 #include "smc_ib.h"
39 #include "smc_pnet.h"
40 #include "smc_tx.h"
41 #include "smc_rx.h"
42 #include "smc_close.h"
43
44 static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group
45 * creation
46 */
47
48 struct smc_lgr_list smc_lgr_list = { /* established link groups */
49 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
50 .list = LIST_HEAD_INIT(smc_lgr_list.list),
51 };
52
53 static void smc_tcp_listen_work(struct work_struct *);
54
55 static void smc_set_keepalive(struct sock *sk, int val)
56 {
57 struct smc_sock *smc = smc_sk(sk);
58
59 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
60 }
61
62 static struct smc_hashinfo smc_v4_hashinfo = {
63 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
64 };
65
66 static struct smc_hashinfo smc_v6_hashinfo = {
67 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
68 };
69
70 int smc_hash_sk(struct sock *sk)
71 {
72 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
73 struct hlist_head *head;
74
75 head = &h->ht;
76
77 write_lock_bh(&h->lock);
78 sk_add_node(sk, head);
79 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
80 write_unlock_bh(&h->lock);
81
82 return 0;
83 }
84 EXPORT_SYMBOL_GPL(smc_hash_sk);
85
86 void smc_unhash_sk(struct sock *sk)
87 {
88 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
89
90 write_lock_bh(&h->lock);
91 if (sk_del_node_init(sk))
92 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
93 write_unlock_bh(&h->lock);
94 }
95 EXPORT_SYMBOL_GPL(smc_unhash_sk);
96
97 struct proto smc_proto = {
98 .name = "SMC",
99 .owner = THIS_MODULE,
100 .keepalive = smc_set_keepalive,
101 .hash = smc_hash_sk,
102 .unhash = smc_unhash_sk,
103 .obj_size = sizeof(struct smc_sock),
104 .h.smc_hash = &smc_v4_hashinfo,
105 .slab_flags = SLAB_TYPESAFE_BY_RCU,
106 };
107 EXPORT_SYMBOL_GPL(smc_proto);
108
109 struct proto smc_proto6 = {
110 .name = "SMC6",
111 .owner = THIS_MODULE,
112 .keepalive = smc_set_keepalive,
113 .hash = smc_hash_sk,
114 .unhash = smc_unhash_sk,
115 .obj_size = sizeof(struct smc_sock),
116 .h.smc_hash = &smc_v6_hashinfo,
117 .slab_flags = SLAB_TYPESAFE_BY_RCU,
118 };
119 EXPORT_SYMBOL_GPL(smc_proto6);
120
121 static int smc_release(struct socket *sock)
122 {
123 struct sock *sk = sock->sk;
124 struct smc_sock *smc;
125 int rc = 0;
126
127 if (!sk)
128 goto out;
129
130 smc = smc_sk(sk);
131 if (sk->sk_state == SMC_LISTEN)
132 /* smc_close_non_accepted() is called and acquires
133 * sock lock for child sockets again
134 */
135 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
136 else
137 lock_sock(sk);
138
139 if (!smc->use_fallback) {
140 rc = smc_close_active(smc);
141 sock_set_flag(sk, SOCK_DEAD);
142 sk->sk_shutdown |= SHUTDOWN_MASK;
143 }
144 if (smc->clcsock) {
145 sock_release(smc->clcsock);
146 smc->clcsock = NULL;
147 }
148 if (smc->use_fallback) {
149 sock_put(sk); /* passive closing */
150 sk->sk_state = SMC_CLOSED;
151 sk->sk_state_change(sk);
152 }
153
154 /* detach socket */
155 sock_orphan(sk);
156 sock->sk = NULL;
157 if (!smc->use_fallback && sk->sk_state == SMC_CLOSED)
158 smc_conn_free(&smc->conn);
159 release_sock(sk);
160
161 sk->sk_prot->unhash(sk);
162 sock_put(sk); /* final sock_put */
163 out:
164 return rc;
165 }
166
167 static void smc_destruct(struct sock *sk)
168 {
169 if (sk->sk_state != SMC_CLOSED)
170 return;
171 if (!sock_flag(sk, SOCK_DEAD))
172 return;
173
174 sk_refcnt_debug_dec(sk);
175 }
176
177 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
178 int protocol)
179 {
180 struct smc_sock *smc;
181 struct proto *prot;
182 struct sock *sk;
183
184 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
185 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
186 if (!sk)
187 return NULL;
188
189 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
190 sk->sk_state = SMC_INIT;
191 sk->sk_destruct = smc_destruct;
192 sk->sk_protocol = protocol;
193 smc = smc_sk(sk);
194 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
195 INIT_LIST_HEAD(&smc->accept_q);
196 spin_lock_init(&smc->accept_q_lock);
197 sk->sk_prot->hash(sk);
198 sk_refcnt_debug_inc(sk);
199
200 return sk;
201 }
202
203 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
204 int addr_len)
205 {
206 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
207 struct sock *sk = sock->sk;
208 struct smc_sock *smc;
209 int rc;
210
211 smc = smc_sk(sk);
212
213 /* replicate tests from inet_bind(), to be safe wrt. future changes */
214 rc = -EINVAL;
215 if (addr_len < sizeof(struct sockaddr_in))
216 goto out;
217
218 rc = -EAFNOSUPPORT;
219 if (addr->sin_family != AF_INET &&
220 addr->sin_family != AF_INET6 &&
221 addr->sin_family != AF_UNSPEC)
222 goto out;
223 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
224 if (addr->sin_family == AF_UNSPEC &&
225 addr->sin_addr.s_addr != htonl(INADDR_ANY))
226 goto out;
227
228 lock_sock(sk);
229
230 /* Check if socket is already active */
231 rc = -EINVAL;
232 if (sk->sk_state != SMC_INIT)
233 goto out_rel;
234
235 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
236 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
237
238 out_rel:
239 release_sock(sk);
240 out:
241 return rc;
242 }
243
244 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
245 unsigned long mask)
246 {
247 /* options we don't get control via setsockopt for */
248 nsk->sk_type = osk->sk_type;
249 nsk->sk_sndbuf = osk->sk_sndbuf;
250 nsk->sk_rcvbuf = osk->sk_rcvbuf;
251 nsk->sk_sndtimeo = osk->sk_sndtimeo;
252 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
253 nsk->sk_mark = osk->sk_mark;
254 nsk->sk_priority = osk->sk_priority;
255 nsk->sk_rcvlowat = osk->sk_rcvlowat;
256 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
257 nsk->sk_err = osk->sk_err;
258
259 nsk->sk_flags &= ~mask;
260 nsk->sk_flags |= osk->sk_flags & mask;
261 }
262
263 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
264 (1UL << SOCK_KEEPOPEN) | \
265 (1UL << SOCK_LINGER) | \
266 (1UL << SOCK_BROADCAST) | \
267 (1UL << SOCK_TIMESTAMP) | \
268 (1UL << SOCK_DBG) | \
269 (1UL << SOCK_RCVTSTAMP) | \
270 (1UL << SOCK_RCVTSTAMPNS) | \
271 (1UL << SOCK_LOCALROUTE) | \
272 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
273 (1UL << SOCK_RXQ_OVFL) | \
274 (1UL << SOCK_WIFI_STATUS) | \
275 (1UL << SOCK_NOFCS) | \
276 (1UL << SOCK_FILTER_LOCKED))
277 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
278 * clc socket (since smc is not called for these options from net/core)
279 */
280 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
281 {
282 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
283 }
284
285 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
286 (1UL << SOCK_KEEPOPEN) | \
287 (1UL << SOCK_LINGER) | \
288 (1UL << SOCK_DBG))
289 /* copy only settings and flags relevant for smc from clc to smc socket */
290 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
291 {
292 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
293 }
294
295 static int smc_clnt_conf_first_link(struct smc_sock *smc)
296 {
297 struct smc_link_group *lgr = smc->conn.lgr;
298 struct smc_link *link;
299 int rest;
300 int rc;
301
302 link = &lgr->lnk[SMC_SINGLE_LINK];
303 /* receive CONFIRM LINK request from server over RoCE fabric */
304 rest = wait_for_completion_interruptible_timeout(
305 &link->llc_confirm,
306 SMC_LLC_WAIT_FIRST_TIME);
307 if (rest <= 0) {
308 struct smc_clc_msg_decline dclc;
309
310 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
311 SMC_CLC_DECLINE);
312 return rc;
313 }
314
315 if (link->llc_confirm_rc)
316 return SMC_CLC_DECL_RMBE_EC;
317
318 rc = smc_ib_modify_qp_rts(link);
319 if (rc)
320 return SMC_CLC_DECL_INTERR;
321
322 smc_wr_remember_qp_attr(link);
323
324 rc = smc_wr_reg_send(link,
325 smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
326 if (rc)
327 return SMC_CLC_DECL_INTERR;
328
329 /* send CONFIRM LINK response over RoCE fabric */
330 rc = smc_llc_send_confirm_link(link,
331 link->smcibdev->mac[link->ibport - 1],
332 &link->smcibdev->gid[link->ibport - 1],
333 SMC_LLC_RESP);
334 if (rc < 0)
335 return SMC_CLC_DECL_TCL;
336
337 /* receive ADD LINK request from server over RoCE fabric */
338 rest = wait_for_completion_interruptible_timeout(&link->llc_add,
339 SMC_LLC_WAIT_TIME);
340 if (rest <= 0) {
341 struct smc_clc_msg_decline dclc;
342
343 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
344 SMC_CLC_DECLINE);
345 return rc;
346 }
347
348 /* send add link reject message, only one link supported for now */
349 rc = smc_llc_send_add_link(link,
350 link->smcibdev->mac[link->ibport - 1],
351 &link->smcibdev->gid[link->ibport - 1],
352 SMC_LLC_RESP);
353 if (rc < 0)
354 return SMC_CLC_DECL_TCL;
355
356 link->state = SMC_LNK_ACTIVE;
357
358 return 0;
359 }
360
361 static void smc_conn_save_peer_info(struct smc_sock *smc,
362 struct smc_clc_msg_accept_confirm *clc)
363 {
364 smc->conn.peer_conn_idx = clc->conn_idx;
365 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
366 smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size);
367 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
368 }
369
370 static void smc_link_save_peer_info(struct smc_link *link,
371 struct smc_clc_msg_accept_confirm *clc)
372 {
373 link->peer_qpn = ntoh24(clc->qpn);
374 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
375 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
376 link->peer_psn = ntoh24(clc->psn);
377 link->peer_mtu = clc->qp_mtu;
378 }
379
380 /* setup for RDMA connection of client */
381 static int smc_connect_rdma(struct smc_sock *smc)
382 {
383 struct smc_clc_msg_accept_confirm aclc;
384 int local_contact = SMC_FIRST_CONTACT;
385 struct smc_ib_device *smcibdev;
386 struct smc_link *link;
387 u8 srv_first_contact;
388 int reason_code = 0;
389 int rc = 0;
390 u8 ibport;
391
392 sock_hold(&smc->sk); /* sock put in passive closing */
393
394 if (!tcp_sk(smc->clcsock->sk)->syn_smc) {
395 /* peer has not signalled SMC-capability */
396 smc->use_fallback = true;
397 goto out_connected;
398 }
399
400 /* IPSec connections opt out of SMC-R optimizations */
401 if (using_ipsec(smc)) {
402 reason_code = SMC_CLC_DECL_IPSEC;
403 goto decline_rdma;
404 }
405
406 /* PNET table look up: search active ib_device and port
407 * within same PNETID that also contains the ethernet device
408 * used for the internal TCP socket
409 */
410 smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport);
411 if (!smcibdev) {
412 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
413 goto decline_rdma;
414 }
415
416 /* do inband token exchange */
417 reason_code = smc_clc_send_proposal(smc, smcibdev, ibport);
418 if (reason_code < 0) {
419 rc = reason_code;
420 goto out_err;
421 }
422 if (reason_code > 0) /* configuration error */
423 goto decline_rdma;
424 /* receive SMC Accept CLC message */
425 reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc),
426 SMC_CLC_ACCEPT);
427 if (reason_code < 0) {
428 rc = reason_code;
429 goto out_err;
430 }
431 if (reason_code > 0)
432 goto decline_rdma;
433
434 srv_first_contact = aclc.hdr.flag;
435 mutex_lock(&smc_create_lgr_pending);
436 local_contact = smc_conn_create(smc, smcibdev, ibport, &aclc.lcl,
437 srv_first_contact);
438 if (local_contact < 0) {
439 rc = local_contact;
440 if (rc == -ENOMEM)
441 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
442 else if (rc == -ENOLINK)
443 reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */
444 goto decline_rdma_unlock;
445 }
446 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
447
448 smc_conn_save_peer_info(smc, &aclc);
449
450 /* create send buffer and rmb */
451 rc = smc_buf_create(smc);
452 if (rc) {
453 reason_code = SMC_CLC_DECL_MEM;
454 goto decline_rdma_unlock;
455 }
456
457 if (local_contact == SMC_FIRST_CONTACT)
458 smc_link_save_peer_info(link, &aclc);
459
460 rc = smc_rmb_rtoken_handling(&smc->conn, &aclc);
461 if (rc) {
462 reason_code = SMC_CLC_DECL_INTERR;
463 goto decline_rdma_unlock;
464 }
465
466 smc_close_init(smc);
467 smc_rx_init(smc);
468
469 if (local_contact == SMC_FIRST_CONTACT) {
470 rc = smc_ib_ready_link(link);
471 if (rc) {
472 reason_code = SMC_CLC_DECL_INTERR;
473 goto decline_rdma_unlock;
474 }
475 } else {
476 struct smc_buf_desc *buf_desc = smc->conn.rmb_desc;
477
478 if (!buf_desc->reused) {
479 /* register memory region for new rmb */
480 rc = smc_wr_reg_send(link,
481 buf_desc->mr_rx[SMC_SINGLE_LINK]);
482 if (rc) {
483 reason_code = SMC_CLC_DECL_INTERR;
484 goto decline_rdma_unlock;
485 }
486 }
487 }
488 smc_rmb_sync_sg_for_device(&smc->conn);
489
490 rc = smc_clc_send_confirm(smc);
491 if (rc)
492 goto out_err_unlock;
493
494 if (local_contact == SMC_FIRST_CONTACT) {
495 /* QP confirmation over RoCE fabric */
496 reason_code = smc_clnt_conf_first_link(smc);
497 if (reason_code < 0) {
498 rc = reason_code;
499 goto out_err_unlock;
500 }
501 if (reason_code > 0)
502 goto decline_rdma_unlock;
503 }
504
505 mutex_unlock(&smc_create_lgr_pending);
506 smc_tx_init(smc);
507
508 out_connected:
509 smc_copy_sock_settings_to_clc(smc);
510 if (smc->sk.sk_state == SMC_INIT)
511 smc->sk.sk_state = SMC_ACTIVE;
512
513 return rc ? rc : local_contact;
514
515 decline_rdma_unlock:
516 if (local_contact == SMC_FIRST_CONTACT)
517 smc_lgr_forget(smc->conn.lgr);
518 mutex_unlock(&smc_create_lgr_pending);
519 smc_conn_free(&smc->conn);
520 decline_rdma:
521 /* RDMA setup failed, switch back to TCP */
522 smc->use_fallback = true;
523 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
524 rc = smc_clc_send_decline(smc, reason_code);
525 if (rc < 0)
526 goto out_err;
527 }
528 goto out_connected;
529
530 out_err_unlock:
531 if (local_contact == SMC_FIRST_CONTACT)
532 smc_lgr_forget(smc->conn.lgr);
533 mutex_unlock(&smc_create_lgr_pending);
534 smc_conn_free(&smc->conn);
535 out_err:
536 if (smc->sk.sk_state == SMC_INIT)
537 sock_put(&smc->sk); /* passive closing */
538 return rc;
539 }
540
541 static int smc_connect(struct socket *sock, struct sockaddr *addr,
542 int alen, int flags)
543 {
544 struct sock *sk = sock->sk;
545 struct smc_sock *smc;
546 int rc = -EINVAL;
547
548 smc = smc_sk(sk);
549
550 /* separate smc parameter checking to be safe */
551 if (alen < sizeof(addr->sa_family))
552 goto out_err;
553 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
554 goto out_err;
555
556 lock_sock(sk);
557 switch (sk->sk_state) {
558 default:
559 goto out;
560 case SMC_ACTIVE:
561 rc = -EISCONN;
562 goto out;
563 case SMC_INIT:
564 rc = 0;
565 break;
566 }
567
568 smc_copy_sock_settings_to_clc(smc);
569 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
570 rc = kernel_connect(smc->clcsock, addr, alen, flags);
571 if (rc)
572 goto out;
573
574 /* setup RDMA connection */
575 rc = smc_connect_rdma(smc);
576 if (rc < 0)
577 goto out;
578 else
579 rc = 0; /* success cases including fallback */
580
581 out:
582 release_sock(sk);
583 out_err:
584 return rc;
585 }
586
587 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
588 {
589 struct socket *new_clcsock = NULL;
590 struct sock *lsk = &lsmc->sk;
591 struct sock *new_sk;
592 int rc;
593
594 release_sock(lsk);
595 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
596 if (!new_sk) {
597 rc = -ENOMEM;
598 lsk->sk_err = ENOMEM;
599 *new_smc = NULL;
600 lock_sock(lsk);
601 goto out;
602 }
603 *new_smc = smc_sk(new_sk);
604
605 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
606 lock_sock(lsk);
607 if (rc < 0)
608 lsk->sk_err = -rc;
609 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
610 if (new_clcsock)
611 sock_release(new_clcsock);
612 new_sk->sk_state = SMC_CLOSED;
613 sock_set_flag(new_sk, SOCK_DEAD);
614 new_sk->sk_prot->unhash(new_sk);
615 sock_put(new_sk); /* final */
616 *new_smc = NULL;
617 goto out;
618 }
619
620 (*new_smc)->clcsock = new_clcsock;
621 out:
622 return rc;
623 }
624
625 /* add a just created sock to the accept queue of the listen sock as
626 * candidate for a following socket accept call from user space
627 */
628 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
629 {
630 struct smc_sock *par = smc_sk(parent);
631
632 sock_hold(sk); /* sock_put in smc_accept_unlink () */
633 spin_lock(&par->accept_q_lock);
634 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
635 spin_unlock(&par->accept_q_lock);
636 sk_acceptq_added(parent);
637 }
638
639 /* remove a socket from the accept queue of its parental listening socket */
640 static void smc_accept_unlink(struct sock *sk)
641 {
642 struct smc_sock *par = smc_sk(sk)->listen_smc;
643
644 spin_lock(&par->accept_q_lock);
645 list_del_init(&smc_sk(sk)->accept_q);
646 spin_unlock(&par->accept_q_lock);
647 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
648 sock_put(sk); /* sock_hold in smc_accept_enqueue */
649 }
650
651 /* remove a sock from the accept queue to bind it to a new socket created
652 * for a socket accept call from user space
653 */
654 struct sock *smc_accept_dequeue(struct sock *parent,
655 struct socket *new_sock)
656 {
657 struct smc_sock *isk, *n;
658 struct sock *new_sk;
659
660 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
661 new_sk = (struct sock *)isk;
662
663 smc_accept_unlink(new_sk);
664 if (new_sk->sk_state == SMC_CLOSED) {
665 if (isk->clcsock) {
666 sock_release(isk->clcsock);
667 isk->clcsock = NULL;
668 }
669 new_sk->sk_prot->unhash(new_sk);
670 sock_put(new_sk); /* final */
671 continue;
672 }
673 if (new_sock)
674 sock_graft(new_sk, new_sock);
675 return new_sk;
676 }
677 return NULL;
678 }
679
680 /* clean up for a created but never accepted sock */
681 void smc_close_non_accepted(struct sock *sk)
682 {
683 struct smc_sock *smc = smc_sk(sk);
684
685 lock_sock(sk);
686 if (!sk->sk_lingertime)
687 /* wait for peer closing */
688 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
689 if (!smc->use_fallback) {
690 smc_close_active(smc);
691 sock_set_flag(sk, SOCK_DEAD);
692 sk->sk_shutdown |= SHUTDOWN_MASK;
693 }
694 if (smc->clcsock) {
695 struct socket *tcp;
696
697 tcp = smc->clcsock;
698 smc->clcsock = NULL;
699 sock_release(tcp);
700 }
701 if (smc->use_fallback) {
702 sock_put(sk); /* passive closing */
703 sk->sk_state = SMC_CLOSED;
704 } else {
705 if (sk->sk_state == SMC_CLOSED)
706 smc_conn_free(&smc->conn);
707 }
708 release_sock(sk);
709 sk->sk_prot->unhash(sk);
710 sock_put(sk); /* final sock_put */
711 }
712
713 static int smc_serv_conf_first_link(struct smc_sock *smc)
714 {
715 struct smc_link_group *lgr = smc->conn.lgr;
716 struct smc_link *link;
717 int rest;
718 int rc;
719
720 link = &lgr->lnk[SMC_SINGLE_LINK];
721
722 rc = smc_wr_reg_send(link,
723 smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]);
724 if (rc)
725 return SMC_CLC_DECL_INTERR;
726
727 /* send CONFIRM LINK request to client over the RoCE fabric */
728 rc = smc_llc_send_confirm_link(link,
729 link->smcibdev->mac[link->ibport - 1],
730 &link->smcibdev->gid[link->ibport - 1],
731 SMC_LLC_REQ);
732 if (rc < 0)
733 return SMC_CLC_DECL_TCL;
734
735 /* receive CONFIRM LINK response from client over the RoCE fabric */
736 rest = wait_for_completion_interruptible_timeout(
737 &link->llc_confirm_resp,
738 SMC_LLC_WAIT_FIRST_TIME);
739 if (rest <= 0) {
740 struct smc_clc_msg_decline dclc;
741
742 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
743 SMC_CLC_DECLINE);
744 return rc;
745 }
746
747 if (link->llc_confirm_resp_rc)
748 return SMC_CLC_DECL_RMBE_EC;
749
750 /* send ADD LINK request to client over the RoCE fabric */
751 rc = smc_llc_send_add_link(link,
752 link->smcibdev->mac[link->ibport - 1],
753 &link->smcibdev->gid[link->ibport - 1],
754 SMC_LLC_REQ);
755 if (rc < 0)
756 return SMC_CLC_DECL_TCL;
757
758 /* receive ADD LINK response from client over the RoCE fabric */
759 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
760 SMC_LLC_WAIT_TIME);
761 if (rest <= 0) {
762 struct smc_clc_msg_decline dclc;
763
764 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
765 SMC_CLC_DECLINE);
766 return rc;
767 }
768
769 link->state = SMC_LNK_ACTIVE;
770
771 return 0;
772 }
773
774 /* setup for RDMA connection of server */
775 static void smc_listen_work(struct work_struct *work)
776 {
777 struct smc_sock *new_smc = container_of(work, struct smc_sock,
778 smc_listen_work);
779 struct smc_clc_msg_proposal_prefix *pclc_prfx;
780 struct socket *newclcsock = new_smc->clcsock;
781 struct smc_sock *lsmc = new_smc->listen_smc;
782 struct smc_clc_msg_accept_confirm cclc;
783 int local_contact = SMC_REUSE_CONTACT;
784 struct sock *newsmcsk = &new_smc->sk;
785 struct smc_clc_msg_proposal *pclc;
786 struct smc_ib_device *smcibdev;
787 u8 buf[SMC_CLC_MAX_LEN];
788 struct smc_link *link;
789 int reason_code = 0;
790 int rc = 0;
791 u8 ibport;
792
793 /* check if peer is smc capable */
794 if (!tcp_sk(newclcsock->sk)->syn_smc) {
795 new_smc->use_fallback = true;
796 goto out_connected;
797 }
798
799 /* do inband token exchange -
800 *wait for and receive SMC Proposal CLC message
801 */
802 reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf),
803 SMC_CLC_PROPOSAL);
804 if (reason_code < 0)
805 goto out_err;
806 if (reason_code > 0)
807 goto decline_rdma;
808
809 /* IPSec connections opt out of SMC-R optimizations */
810 if (using_ipsec(new_smc)) {
811 reason_code = SMC_CLC_DECL_IPSEC;
812 goto decline_rdma;
813 }
814
815 /* PNET table look up: search active ib_device and port
816 * within same PNETID that also contains the ethernet device
817 * used for the internal TCP socket
818 */
819 smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport);
820 if (!smcibdev) {
821 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
822 goto decline_rdma;
823 }
824
825 pclc = (struct smc_clc_msg_proposal *)&buf;
826 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
827
828 rc = smc_clc_prfx_match(newclcsock, pclc_prfx);
829 if (rc) {
830 reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */
831 goto decline_rdma;
832 }
833
834 /* allocate connection / link group */
835 mutex_lock(&smc_create_lgr_pending);
836 local_contact = smc_conn_create(new_smc, smcibdev, ibport, &pclc->lcl,
837 0);
838 if (local_contact < 0) {
839 rc = local_contact;
840 if (rc == -ENOMEM)
841 reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/
842 goto decline_rdma_unlock;
843 }
844 link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
845
846 /* create send buffer and rmb */
847 rc = smc_buf_create(new_smc);
848 if (rc) {
849 reason_code = SMC_CLC_DECL_MEM;
850 goto decline_rdma_unlock;
851 }
852
853 smc_close_init(new_smc);
854 smc_rx_init(new_smc);
855
856 if (local_contact != SMC_FIRST_CONTACT) {
857 struct smc_buf_desc *buf_desc = new_smc->conn.rmb_desc;
858
859 if (!buf_desc->reused) {
860 /* register memory region for new rmb */
861 rc = smc_wr_reg_send(link,
862 buf_desc->mr_rx[SMC_SINGLE_LINK]);
863 if (rc) {
864 reason_code = SMC_CLC_DECL_INTERR;
865 goto decline_rdma_unlock;
866 }
867 }
868 }
869 smc_rmb_sync_sg_for_device(&new_smc->conn);
870
871 rc = smc_clc_send_accept(new_smc, local_contact);
872 if (rc)
873 goto out_err_unlock;
874
875 /* receive SMC Confirm CLC message */
876 reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
877 SMC_CLC_CONFIRM);
878 if (reason_code < 0)
879 goto out_err_unlock;
880 if (reason_code > 0)
881 goto decline_rdma_unlock;
882 smc_conn_save_peer_info(new_smc, &cclc);
883 if (local_contact == SMC_FIRST_CONTACT)
884 smc_link_save_peer_info(link, &cclc);
885
886 rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc);
887 if (rc) {
888 reason_code = SMC_CLC_DECL_INTERR;
889 goto decline_rdma_unlock;
890 }
891
892 if (local_contact == SMC_FIRST_CONTACT) {
893 rc = smc_ib_ready_link(link);
894 if (rc) {
895 reason_code = SMC_CLC_DECL_INTERR;
896 goto decline_rdma_unlock;
897 }
898 /* QP confirmation over RoCE fabric */
899 reason_code = smc_serv_conf_first_link(new_smc);
900 if (reason_code < 0)
901 /* peer is not aware of a problem */
902 goto out_err_unlock;
903 if (reason_code > 0)
904 goto decline_rdma_unlock;
905 }
906
907 smc_tx_init(new_smc);
908 mutex_unlock(&smc_create_lgr_pending);
909
910 out_connected:
911 sk_refcnt_debug_inc(newsmcsk);
912 if (newsmcsk->sk_state == SMC_INIT)
913 newsmcsk->sk_state = SMC_ACTIVE;
914 enqueue:
915 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
916 if (lsmc->sk.sk_state == SMC_LISTEN) {
917 smc_accept_enqueue(&lsmc->sk, newsmcsk);
918 } else { /* no longer listening */
919 smc_close_non_accepted(newsmcsk);
920 }
921 release_sock(&lsmc->sk);
922
923 /* Wake up accept */
924 lsmc->sk.sk_data_ready(&lsmc->sk);
925 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
926 return;
927
928 decline_rdma_unlock:
929 if (local_contact == SMC_FIRST_CONTACT)
930 smc_lgr_forget(new_smc->conn.lgr);
931 mutex_unlock(&smc_create_lgr_pending);
932 decline_rdma:
933 /* RDMA setup failed, switch back to TCP */
934 smc_conn_free(&new_smc->conn);
935 new_smc->use_fallback = true;
936 if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) {
937 if (smc_clc_send_decline(new_smc, reason_code) < 0)
938 goto out_err;
939 }
940 goto out_connected;
941
942 out_err_unlock:
943 if (local_contact == SMC_FIRST_CONTACT)
944 smc_lgr_forget(new_smc->conn.lgr);
945 mutex_unlock(&smc_create_lgr_pending);
946 out_err:
947 if (newsmcsk->sk_state == SMC_INIT)
948 sock_put(&new_smc->sk); /* passive closing */
949 newsmcsk->sk_state = SMC_CLOSED;
950 smc_conn_free(&new_smc->conn);
951 goto enqueue; /* queue new sock with sk_err set */
952 }
953
954 static void smc_tcp_listen_work(struct work_struct *work)
955 {
956 struct smc_sock *lsmc = container_of(work, struct smc_sock,
957 tcp_listen_work);
958 struct sock *lsk = &lsmc->sk;
959 struct smc_sock *new_smc;
960 int rc = 0;
961
962 lock_sock(lsk);
963 while (lsk->sk_state == SMC_LISTEN) {
964 rc = smc_clcsock_accept(lsmc, &new_smc);
965 if (rc)
966 goto out;
967 if (!new_smc)
968 continue;
969
970 new_smc->listen_smc = lsmc;
971 new_smc->use_fallback = false; /* assume rdma capability first*/
972 sock_hold(lsk); /* sock_put in smc_listen_work */
973 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
974 smc_copy_sock_settings_to_smc(new_smc);
975 sock_hold(&new_smc->sk); /* sock_put in passive closing */
976 if (!schedule_work(&new_smc->smc_listen_work))
977 sock_put(&new_smc->sk);
978 }
979
980 out:
981 if (lsmc->clcsock) {
982 sock_release(lsmc->clcsock);
983 lsmc->clcsock = NULL;
984 }
985 release_sock(lsk);
986 sock_put(&lsmc->sk); /* sock_hold in smc_listen */
987 }
988
989 static int smc_listen(struct socket *sock, int backlog)
990 {
991 struct sock *sk = sock->sk;
992 struct smc_sock *smc;
993 int rc;
994
995 smc = smc_sk(sk);
996 lock_sock(sk);
997
998 rc = -EINVAL;
999 if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
1000 goto out;
1001
1002 rc = 0;
1003 if (sk->sk_state == SMC_LISTEN) {
1004 sk->sk_max_ack_backlog = backlog;
1005 goto out;
1006 }
1007 /* some socket options are handled in core, so we could not apply
1008 * them to the clc socket -- copy smc socket options to clc socket
1009 */
1010 smc_copy_sock_settings_to_clc(smc);
1011 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1012
1013 rc = kernel_listen(smc->clcsock, backlog);
1014 if (rc)
1015 goto out;
1016 sk->sk_max_ack_backlog = backlog;
1017 sk->sk_ack_backlog = 0;
1018 sk->sk_state = SMC_LISTEN;
1019 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
1020 sock_hold(sk); /* sock_hold in tcp_listen_worker */
1021 if (!schedule_work(&smc->tcp_listen_work))
1022 sock_put(sk);
1023
1024 out:
1025 release_sock(sk);
1026 return rc;
1027 }
1028
1029 static int smc_accept(struct socket *sock, struct socket *new_sock,
1030 int flags, bool kern)
1031 {
1032 struct sock *sk = sock->sk, *nsk;
1033 DECLARE_WAITQUEUE(wait, current);
1034 struct smc_sock *lsmc;
1035 long timeo;
1036 int rc = 0;
1037
1038 lsmc = smc_sk(sk);
1039 sock_hold(sk); /* sock_put below */
1040 lock_sock(sk);
1041
1042 if (lsmc->sk.sk_state != SMC_LISTEN) {
1043 rc = -EINVAL;
1044 goto out;
1045 }
1046
1047 /* Wait for an incoming connection */
1048 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1049 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1050 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1051 set_current_state(TASK_INTERRUPTIBLE);
1052 if (!timeo) {
1053 rc = -EAGAIN;
1054 break;
1055 }
1056 release_sock(sk);
1057 timeo = schedule_timeout(timeo);
1058 /* wakeup by sk_data_ready in smc_listen_work() */
1059 sched_annotate_sleep();
1060 lock_sock(sk);
1061 if (signal_pending(current)) {
1062 rc = sock_intr_errno(timeo);
1063 break;
1064 }
1065 }
1066 set_current_state(TASK_RUNNING);
1067 remove_wait_queue(sk_sleep(sk), &wait);
1068
1069 if (!rc)
1070 rc = sock_error(nsk);
1071
1072 out:
1073 release_sock(sk);
1074 sock_put(sk); /* sock_hold above */
1075 return rc;
1076 }
1077
1078 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1079 int peer)
1080 {
1081 struct smc_sock *smc;
1082
1083 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1084 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1085 return -ENOTCONN;
1086
1087 smc = smc_sk(sock->sk);
1088
1089 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1090 }
1091
1092 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1093 {
1094 struct sock *sk = sock->sk;
1095 struct smc_sock *smc;
1096 int rc = -EPIPE;
1097
1098 smc = smc_sk(sk);
1099 lock_sock(sk);
1100 if ((sk->sk_state != SMC_ACTIVE) &&
1101 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1102 (sk->sk_state != SMC_INIT))
1103 goto out;
1104 if (smc->use_fallback)
1105 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1106 else
1107 rc = smc_tx_sendmsg(smc, msg, len);
1108 out:
1109 release_sock(sk);
1110 return rc;
1111 }
1112
1113 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1114 int flags)
1115 {
1116 struct sock *sk = sock->sk;
1117 struct smc_sock *smc;
1118 int rc = -ENOTCONN;
1119
1120 smc = smc_sk(sk);
1121 lock_sock(sk);
1122 if ((sk->sk_state == SMC_INIT) ||
1123 (sk->sk_state == SMC_LISTEN) ||
1124 (sk->sk_state == SMC_CLOSED))
1125 goto out;
1126
1127 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1128 rc = 0;
1129 goto out;
1130 }
1131
1132 if (smc->use_fallback)
1133 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1134 else
1135 rc = smc_rx_recvmsg(smc, msg, len, flags);
1136
1137 out:
1138 release_sock(sk);
1139 return rc;
1140 }
1141
1142 static __poll_t smc_accept_poll(struct sock *parent)
1143 {
1144 struct smc_sock *isk = smc_sk(parent);
1145 __poll_t mask = 0;
1146
1147 spin_lock(&isk->accept_q_lock);
1148 if (!list_empty(&isk->accept_q))
1149 mask = EPOLLIN | EPOLLRDNORM;
1150 spin_unlock(&isk->accept_q_lock);
1151
1152 return mask;
1153 }
1154
1155 static __poll_t smc_poll(struct file *file, struct socket *sock,
1156 poll_table *wait)
1157 {
1158 struct sock *sk = sock->sk;
1159 __poll_t mask = 0;
1160 struct smc_sock *smc;
1161 int rc;
1162
1163 if (!sk)
1164 return EPOLLNVAL;
1165
1166 smc = smc_sk(sock->sk);
1167 sock_hold(sk);
1168 lock_sock(sk);
1169 if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
1170 /* delegate to CLC child sock */
1171 release_sock(sk);
1172 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1173 /* if non-blocking connect finished ... */
1174 lock_sock(sk);
1175 if ((sk->sk_state == SMC_INIT) && (mask & EPOLLOUT)) {
1176 sk->sk_err = smc->clcsock->sk->sk_err;
1177 if (sk->sk_err) {
1178 mask |= EPOLLERR;
1179 } else {
1180 rc = smc_connect_rdma(smc);
1181 if (rc < 0)
1182 mask |= EPOLLERR;
1183 /* success cases including fallback */
1184 mask |= EPOLLOUT | EPOLLWRNORM;
1185 }
1186 }
1187 } else {
1188 if (sk->sk_state != SMC_CLOSED) {
1189 release_sock(sk);
1190 sock_poll_wait(file, sk_sleep(sk), wait);
1191 lock_sock(sk);
1192 }
1193 if (sk->sk_err)
1194 mask |= EPOLLERR;
1195 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1196 (sk->sk_state == SMC_CLOSED))
1197 mask |= EPOLLHUP;
1198 if (sk->sk_state == SMC_LISTEN) {
1199 /* woken up by sk_data_ready in smc_listen_work() */
1200 mask = smc_accept_poll(sk);
1201 } else {
1202 if (atomic_read(&smc->conn.sndbuf_space) ||
1203 sk->sk_shutdown & SEND_SHUTDOWN) {
1204 mask |= EPOLLOUT | EPOLLWRNORM;
1205 } else {
1206 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1207 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1208 }
1209 if (atomic_read(&smc->conn.bytes_to_rcv))
1210 mask |= EPOLLIN | EPOLLRDNORM;
1211 if (sk->sk_shutdown & RCV_SHUTDOWN)
1212 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1213 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1214 mask |= EPOLLIN;
1215 }
1216
1217 }
1218 release_sock(sk);
1219 sock_put(sk);
1220
1221 return mask;
1222 }
1223
1224 static int smc_shutdown(struct socket *sock, int how)
1225 {
1226 struct sock *sk = sock->sk;
1227 struct smc_sock *smc;
1228 int rc = -EINVAL;
1229 int rc1 = 0;
1230
1231 smc = smc_sk(sk);
1232
1233 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1234 return rc;
1235
1236 lock_sock(sk);
1237
1238 rc = -ENOTCONN;
1239 if ((sk->sk_state != SMC_LISTEN) &&
1240 (sk->sk_state != SMC_ACTIVE) &&
1241 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1242 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1243 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1244 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1245 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1246 goto out;
1247 if (smc->use_fallback) {
1248 rc = kernel_sock_shutdown(smc->clcsock, how);
1249 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1250 if (sk->sk_shutdown == SHUTDOWN_MASK)
1251 sk->sk_state = SMC_CLOSED;
1252 goto out;
1253 }
1254 switch (how) {
1255 case SHUT_RDWR: /* shutdown in both directions */
1256 rc = smc_close_active(smc);
1257 break;
1258 case SHUT_WR:
1259 rc = smc_close_shutdown_write(smc);
1260 break;
1261 case SHUT_RD:
1262 if (sk->sk_state == SMC_LISTEN)
1263 rc = smc_close_active(smc);
1264 else
1265 rc = 0;
1266 /* nothing more to do because peer is not involved */
1267 break;
1268 }
1269 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1270 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1271 sk->sk_shutdown |= how + 1;
1272
1273 out:
1274 release_sock(sk);
1275 return rc ? rc : rc1;
1276 }
1277
1278 static int smc_setsockopt(struct socket *sock, int level, int optname,
1279 char __user *optval, unsigned int optlen)
1280 {
1281 struct sock *sk = sock->sk;
1282 struct smc_sock *smc;
1283
1284 smc = smc_sk(sk);
1285
1286 /* generic setsockopts reaching us here always apply to the
1287 * CLC socket
1288 */
1289 return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1290 optval, optlen);
1291 }
1292
1293 static int smc_getsockopt(struct socket *sock, int level, int optname,
1294 char __user *optval, int __user *optlen)
1295 {
1296 struct smc_sock *smc;
1297
1298 smc = smc_sk(sock->sk);
1299 /* socket options apply to the CLC socket */
1300 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1301 optval, optlen);
1302 }
1303
1304 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1305 unsigned long arg)
1306 {
1307 struct smc_sock *smc;
1308
1309 smc = smc_sk(sock->sk);
1310 if (smc->use_fallback)
1311 return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1312 else
1313 return sock_no_ioctl(sock, cmd, arg);
1314 }
1315
1316 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1317 int offset, size_t size, int flags)
1318 {
1319 struct sock *sk = sock->sk;
1320 struct smc_sock *smc;
1321 int rc = -EPIPE;
1322
1323 smc = smc_sk(sk);
1324 lock_sock(sk);
1325 if (sk->sk_state != SMC_ACTIVE)
1326 goto out;
1327 if (smc->use_fallback)
1328 rc = kernel_sendpage(smc->clcsock, page, offset,
1329 size, flags);
1330 else
1331 rc = sock_no_sendpage(sock, page, offset, size, flags);
1332
1333 out:
1334 release_sock(sk);
1335 return rc;
1336 }
1337
1338 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1339 struct pipe_inode_info *pipe, size_t len,
1340 unsigned int flags)
1341 {
1342 struct sock *sk = sock->sk;
1343 struct smc_sock *smc;
1344 int rc = -ENOTCONN;
1345
1346 smc = smc_sk(sk);
1347 lock_sock(sk);
1348 if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
1349 goto out;
1350 if (smc->use_fallback) {
1351 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1352 pipe, len, flags);
1353 } else {
1354 rc = -EOPNOTSUPP;
1355 }
1356 out:
1357 release_sock(sk);
1358 return rc;
1359 }
1360
1361 /* must look like tcp */
1362 static const struct proto_ops smc_sock_ops = {
1363 .family = PF_SMC,
1364 .owner = THIS_MODULE,
1365 .release = smc_release,
1366 .bind = smc_bind,
1367 .connect = smc_connect,
1368 .socketpair = sock_no_socketpair,
1369 .accept = smc_accept,
1370 .getname = smc_getname,
1371 .poll = smc_poll,
1372 .ioctl = smc_ioctl,
1373 .listen = smc_listen,
1374 .shutdown = smc_shutdown,
1375 .setsockopt = smc_setsockopt,
1376 .getsockopt = smc_getsockopt,
1377 .sendmsg = smc_sendmsg,
1378 .recvmsg = smc_recvmsg,
1379 .mmap = sock_no_mmap,
1380 .sendpage = smc_sendpage,
1381 .splice_read = smc_splice_read,
1382 };
1383
1384 static int smc_create(struct net *net, struct socket *sock, int protocol,
1385 int kern)
1386 {
1387 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1388 struct smc_sock *smc;
1389 struct sock *sk;
1390 int rc;
1391
1392 rc = -ESOCKTNOSUPPORT;
1393 if (sock->type != SOCK_STREAM)
1394 goto out;
1395
1396 rc = -EPROTONOSUPPORT;
1397 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1398 goto out;
1399
1400 rc = -ENOBUFS;
1401 sock->ops = &smc_sock_ops;
1402 sk = smc_sock_alloc(net, sock, protocol);
1403 if (!sk)
1404 goto out;
1405
1406 /* create internal TCP socket for CLC handshake and fallback */
1407 smc = smc_sk(sk);
1408 smc->use_fallback = false; /* assume rdma capability first */
1409 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1410 &smc->clcsock);
1411 if (rc) {
1412 sk_common_release(sk);
1413 goto out;
1414 }
1415 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1416 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1417
1418 out:
1419 return rc;
1420 }
1421
1422 static const struct net_proto_family smc_sock_family_ops = {
1423 .family = PF_SMC,
1424 .owner = THIS_MODULE,
1425 .create = smc_create,
1426 };
1427
1428 static int __init smc_init(void)
1429 {
1430 int rc;
1431
1432 rc = smc_pnet_init();
1433 if (rc)
1434 return rc;
1435
1436 rc = smc_llc_init();
1437 if (rc) {
1438 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
1439 goto out_pnet;
1440 }
1441
1442 rc = smc_cdc_init();
1443 if (rc) {
1444 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
1445 goto out_pnet;
1446 }
1447
1448 rc = proto_register(&smc_proto, 1);
1449 if (rc) {
1450 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
1451 goto out_pnet;
1452 }
1453
1454 rc = proto_register(&smc_proto6, 1);
1455 if (rc) {
1456 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
1457 goto out_proto;
1458 }
1459
1460 rc = sock_register(&smc_sock_family_ops);
1461 if (rc) {
1462 pr_err("%s: sock_register fails with %d\n", __func__, rc);
1463 goto out_proto6;
1464 }
1465 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
1466 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
1467
1468 rc = smc_ib_register_client();
1469 if (rc) {
1470 pr_err("%s: ib_register fails with %d\n", __func__, rc);
1471 goto out_sock;
1472 }
1473
1474 static_branch_enable(&tcp_have_smc);
1475 return 0;
1476
1477 out_sock:
1478 sock_unregister(PF_SMC);
1479 out_proto6:
1480 proto_unregister(&smc_proto6);
1481 out_proto:
1482 proto_unregister(&smc_proto);
1483 out_pnet:
1484 smc_pnet_exit();
1485 return rc;
1486 }
1487
1488 static void __exit smc_exit(void)
1489 {
1490 struct smc_link_group *lgr, *lg;
1491 LIST_HEAD(lgr_freeing_list);
1492
1493 spin_lock_bh(&smc_lgr_list.lock);
1494 if (!list_empty(&smc_lgr_list.list))
1495 list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1496 spin_unlock_bh(&smc_lgr_list.lock);
1497 list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1498 list_del_init(&lgr->list);
1499 cancel_delayed_work_sync(&lgr->free_work);
1500 smc_lgr_free(lgr); /* free link group */
1501 }
1502 static_branch_disable(&tcp_have_smc);
1503 smc_ib_unregister_client();
1504 sock_unregister(PF_SMC);
1505 proto_unregister(&smc_proto6);
1506 proto_unregister(&smc_proto);
1507 smc_pnet_exit();
1508 }
1509
1510 module_init(smc_init);
1511 module_exit(smc_exit);
1512
1513 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
1514 MODULE_DESCRIPTION("smc socket address family");
1515 MODULE_LICENSE("GPL");
1516 MODULE_ALIAS_NETPROTO(PF_SMC);
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