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