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WIP FPC-III support
[linux/fpc-iii.git] / net / smc / af_smc.c
blob47340b3b514f3bc484eaa885a95f7b668d777492
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * AF_SMC protocol family socket handler keeping the AF_INET sock address type
6 * applies to SOCK_STREAM sockets only
7 * offers an alternative communication option for TCP-protocol sockets
8 * applicable with RoCE-cards only
9 *
10 * Initial restrictions:
11 * - support for alternate links postponed
12 *
13 * Copyright IBM Corp. 2016, 2018
14 *
15 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
16 * based on prototype from Frank Blaschka
17 */
18
19 #define KMSG_COMPONENT "smc"
20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/socket.h>
24 #include <linux/workqueue.h>
25 #include <linux/in.h>
26 #include <linux/sched/signal.h>
27 #include <linux/if_vlan.h>
28 #include <linux/rcupdate_wait.h>
29 #include <linux/ctype.h>
30
31 #include <net/sock.h>
32 #include <net/tcp.h>
33 #include <net/smc.h>
34 #include <asm/ioctls.h>
35
36 #include <net/net_namespace.h>
37 #include <net/netns/generic.h>
38 #include "smc_netns.h"
39
40 #include "smc.h"
41 #include "smc_clc.h"
42 #include "smc_llc.h"
43 #include "smc_cdc.h"
44 #include "smc_core.h"
45 #include "smc_ib.h"
46 #include "smc_ism.h"
47 #include "smc_pnet.h"
48 #include "smc_netlink.h"
49 #include "smc_tx.h"
50 #include "smc_rx.h"
51 #include "smc_close.h"
52
53 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
54 * creation on server
55 */
56 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
57 * creation on client
58 */
59
60 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
61 struct workqueue_struct *smc_close_wq; /* wq for close work */
62
63 static void smc_tcp_listen_work(struct work_struct *);
64 static void smc_connect_work(struct work_struct *);
65
66 static void smc_set_keepalive(struct sock *sk, int val)
67 {
68 struct smc_sock *smc = smc_sk(sk);
69
70 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
71 }
72
73 static struct smc_hashinfo smc_v4_hashinfo = {
74 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
75 };
76
77 static struct smc_hashinfo smc_v6_hashinfo = {
78 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
79 };
80
81 int smc_hash_sk(struct sock *sk)
82 {
83 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
84 struct hlist_head *head;
85
86 head = &h->ht;
87
88 write_lock_bh(&h->lock);
89 sk_add_node(sk, head);
90 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
91 write_unlock_bh(&h->lock);
92
93 return 0;
94 }
95 EXPORT_SYMBOL_GPL(smc_hash_sk);
96
97 void smc_unhash_sk(struct sock *sk)
98 {
99 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
100
101 write_lock_bh(&h->lock);
102 if (sk_del_node_init(sk))
103 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
104 write_unlock_bh(&h->lock);
105 }
106 EXPORT_SYMBOL_GPL(smc_unhash_sk);
107
108 struct proto smc_proto = {
109 .name = "SMC",
110 .owner = THIS_MODULE,
111 .keepalive = smc_set_keepalive,
112 .hash = smc_hash_sk,
113 .unhash = smc_unhash_sk,
114 .obj_size = sizeof(struct smc_sock),
115 .h.smc_hash = &smc_v4_hashinfo,
116 .slab_flags = SLAB_TYPESAFE_BY_RCU,
117 };
118 EXPORT_SYMBOL_GPL(smc_proto);
119
120 struct proto smc_proto6 = {
121 .name = "SMC6",
122 .owner = THIS_MODULE,
123 .keepalive = smc_set_keepalive,
124 .hash = smc_hash_sk,
125 .unhash = smc_unhash_sk,
126 .obj_size = sizeof(struct smc_sock),
127 .h.smc_hash = &smc_v6_hashinfo,
128 .slab_flags = SLAB_TYPESAFE_BY_RCU,
129 };
130 EXPORT_SYMBOL_GPL(smc_proto6);
131
132 static void smc_restore_fallback_changes(struct smc_sock *smc)
133 {
134 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
135 smc->clcsock->file->private_data = smc->sk.sk_socket;
136 smc->clcsock->file = NULL;
137 }
138 }
139
140 static int __smc_release(struct smc_sock *smc)
141 {
142 struct sock *sk = &smc->sk;
143 int rc = 0;
144
145 if (!smc->use_fallback) {
146 rc = smc_close_active(smc);
147 sock_set_flag(sk, SOCK_DEAD);
148 sk->sk_shutdown |= SHUTDOWN_MASK;
149 } else {
150 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
151 sock_put(sk); /* passive closing */
152 if (sk->sk_state == SMC_LISTEN) {
153 /* wake up clcsock accept */
154 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
155 }
156 sk->sk_state = SMC_CLOSED;
157 sk->sk_state_change(sk);
158 smc_restore_fallback_changes(smc);
159 }
160
161 sk->sk_prot->unhash(sk);
162
163 if (sk->sk_state == SMC_CLOSED) {
164 if (smc->clcsock) {
165 release_sock(sk);
166 smc_clcsock_release(smc);
167 lock_sock(sk);
168 }
169 if (!smc->use_fallback)
170 smc_conn_free(&smc->conn);
171 }
172
173 return rc;
174 }
175
176 static int smc_release(struct socket *sock)
177 {
178 struct sock *sk = sock->sk;
179 struct smc_sock *smc;
180 int rc = 0;
181
182 if (!sk)
183 goto out;
184
185 sock_hold(sk); /* sock_put below */
186 smc = smc_sk(sk);
187
188 /* cleanup for a dangling non-blocking connect */
189 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
190 tcp_abort(smc->clcsock->sk, ECONNABORTED);
191 flush_work(&smc->connect_work);
192
193 if (sk->sk_state == SMC_LISTEN)
194 /* smc_close_non_accepted() is called and acquires
195 * sock lock for child sockets again
196 */
197 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
198 else
199 lock_sock(sk);
200
201 rc = __smc_release(smc);
202
203 /* detach socket */
204 sock_orphan(sk);
205 sock->sk = NULL;
206 release_sock(sk);
207
208 sock_put(sk); /* sock_hold above */
209 sock_put(sk); /* final sock_put */
210 out:
211 return rc;
212 }
213
214 static void smc_destruct(struct sock *sk)
215 {
216 if (sk->sk_state != SMC_CLOSED)
217 return;
218 if (!sock_flag(sk, SOCK_DEAD))
219 return;
220
221 sk_refcnt_debug_dec(sk);
222 }
223
224 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
225 int protocol)
226 {
227 struct smc_sock *smc;
228 struct proto *prot;
229 struct sock *sk;
230
231 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
232 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
233 if (!sk)
234 return NULL;
235
236 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
237 sk->sk_state = SMC_INIT;
238 sk->sk_destruct = smc_destruct;
239 sk->sk_protocol = protocol;
240 smc = smc_sk(sk);
241 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
242 INIT_WORK(&smc->connect_work, smc_connect_work);
243 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
244 INIT_LIST_HEAD(&smc->accept_q);
245 spin_lock_init(&smc->accept_q_lock);
246 spin_lock_init(&smc->conn.send_lock);
247 sk->sk_prot->hash(sk);
248 sk_refcnt_debug_inc(sk);
249 mutex_init(&smc->clcsock_release_lock);
250
251 return sk;
252 }
253
254 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
255 int addr_len)
256 {
257 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
258 struct sock *sk = sock->sk;
259 struct smc_sock *smc;
260 int rc;
261
262 smc = smc_sk(sk);
263
264 /* replicate tests from inet_bind(), to be safe wrt. future changes */
265 rc = -EINVAL;
266 if (addr_len < sizeof(struct sockaddr_in))
267 goto out;
268
269 rc = -EAFNOSUPPORT;
270 if (addr->sin_family != AF_INET &&
271 addr->sin_family != AF_INET6 &&
272 addr->sin_family != AF_UNSPEC)
273 goto out;
274 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
275 if (addr->sin_family == AF_UNSPEC &&
276 addr->sin_addr.s_addr != htonl(INADDR_ANY))
277 goto out;
278
279 lock_sock(sk);
280
281 /* Check if socket is already active */
282 rc = -EINVAL;
283 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
284 goto out_rel;
285
286 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
287 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
288
289 out_rel:
290 release_sock(sk);
291 out:
292 return rc;
293 }
294
295 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
296 unsigned long mask)
297 {
298 /* options we don't get control via setsockopt for */
299 nsk->sk_type = osk->sk_type;
300 nsk->sk_sndbuf = osk->sk_sndbuf;
301 nsk->sk_rcvbuf = osk->sk_rcvbuf;
302 nsk->sk_sndtimeo = osk->sk_sndtimeo;
303 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
304 nsk->sk_mark = osk->sk_mark;
305 nsk->sk_priority = osk->sk_priority;
306 nsk->sk_rcvlowat = osk->sk_rcvlowat;
307 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
308 nsk->sk_err = osk->sk_err;
309
310 nsk->sk_flags &= ~mask;
311 nsk->sk_flags |= osk->sk_flags & mask;
312 }
313
314 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
315 (1UL << SOCK_KEEPOPEN) | \
316 (1UL << SOCK_LINGER) | \
317 (1UL << SOCK_BROADCAST) | \
318 (1UL << SOCK_TIMESTAMP) | \
319 (1UL << SOCK_DBG) | \
320 (1UL << SOCK_RCVTSTAMP) | \
321 (1UL << SOCK_RCVTSTAMPNS) | \
322 (1UL << SOCK_LOCALROUTE) | \
323 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
324 (1UL << SOCK_RXQ_OVFL) | \
325 (1UL << SOCK_WIFI_STATUS) | \
326 (1UL << SOCK_NOFCS) | \
327 (1UL << SOCK_FILTER_LOCKED) | \
328 (1UL << SOCK_TSTAMP_NEW))
329 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
330 * clc socket (since smc is not called for these options from net/core)
331 */
332 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
333 {
334 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
335 }
336
337 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
338 (1UL << SOCK_KEEPOPEN) | \
339 (1UL << SOCK_LINGER) | \
340 (1UL << SOCK_DBG))
341 /* copy only settings and flags relevant for smc from clc to smc socket */
342 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
343 {
344 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
345 }
346
347 /* register the new rmb on all links */
348 static int smcr_lgr_reg_rmbs(struct smc_link *link,
349 struct smc_buf_desc *rmb_desc)
350 {
351 struct smc_link_group *lgr = link->lgr;
352 int i, rc = 0;
353
354 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
355 if (rc)
356 return rc;
357 /* protect against parallel smc_llc_cli_rkey_exchange() and
358 * parallel smcr_link_reg_rmb()
359 */
360 mutex_lock(&lgr->llc_conf_mutex);
361 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
362 if (!smc_link_active(&lgr->lnk[i]))
363 continue;
364 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
365 if (rc)
366 goto out;
367 }
368
369 /* exchange confirm_rkey msg with peer */
370 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
371 if (rc) {
372 rc = -EFAULT;
373 goto out;
374 }
375 rmb_desc->is_conf_rkey = true;
376 out:
377 mutex_unlock(&lgr->llc_conf_mutex);
378 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
379 return rc;
380 }
381
382 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
383 {
384 struct smc_link *link = smc->conn.lnk;
385 struct smc_llc_qentry *qentry;
386 int rc;
387
388 /* receive CONFIRM LINK request from server over RoCE fabric */
389 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
390 SMC_LLC_CONFIRM_LINK);
391 if (!qentry) {
392 struct smc_clc_msg_decline dclc;
393
394 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
395 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
396 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
397 }
398 smc_llc_save_peer_uid(qentry);
399 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
400 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
401 if (rc)
402 return SMC_CLC_DECL_RMBE_EC;
403
404 rc = smc_ib_modify_qp_rts(link);
405 if (rc)
406 return SMC_CLC_DECL_ERR_RDYLNK;
407
408 smc_wr_remember_qp_attr(link);
409
410 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
411 return SMC_CLC_DECL_ERR_REGRMB;
412
413 /* confirm_rkey is implicit on 1st contact */
414 smc->conn.rmb_desc->is_conf_rkey = true;
415
416 /* send CONFIRM LINK response over RoCE fabric */
417 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
418 if (rc < 0)
419 return SMC_CLC_DECL_TIMEOUT_CL;
420
421 smc_llc_link_active(link);
422 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
423
424 /* optional 2nd link, receive ADD LINK request from server */
425 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
426 SMC_LLC_ADD_LINK);
427 if (!qentry) {
428 struct smc_clc_msg_decline dclc;
429
430 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
431 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
432 if (rc == -EAGAIN)
433 rc = 0; /* no DECLINE received, go with one link */
434 return rc;
435 }
436 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
437 smc_llc_cli_add_link(link, qentry);
438 return 0;
439 }
440
441 static void smcr_conn_save_peer_info(struct smc_sock *smc,
442 struct smc_clc_msg_accept_confirm *clc)
443 {
444 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
445
446 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
447 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
448 smc->conn.peer_rmbe_size = bufsize;
449 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
450 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
451 }
452
453 static bool smc_isascii(char *hostname)
454 {
455 int i;
456
457 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
458 if (!isascii(hostname[i]))
459 return false;
460 return true;
461 }
462
463 static void smcd_conn_save_peer_info(struct smc_sock *smc,
464 struct smc_clc_msg_accept_confirm *clc)
465 {
466 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
467
468 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
469 smc->conn.peer_token = clc->d0.token;
470 /* msg header takes up space in the buffer */
471 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
472 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
473 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
474 if (clc->hdr.version > SMC_V1 &&
475 (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) {
476 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
477 (struct smc_clc_msg_accept_confirm_v2 *)clc;
478 struct smc_clc_first_contact_ext *fce =
479 (struct smc_clc_first_contact_ext *)
480 (((u8 *)clc_v2) + sizeof(*clc_v2));
481
482 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid,
483 SMC_MAX_EID_LEN);
484 smc->conn.lgr->peer_os = fce->os_type;
485 smc->conn.lgr->peer_smc_release = fce->release;
486 if (smc_isascii(fce->hostname))
487 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
488 SMC_MAX_HOSTNAME_LEN);
489 }
490 }
491
492 static void smc_conn_save_peer_info(struct smc_sock *smc,
493 struct smc_clc_msg_accept_confirm *clc)
494 {
495 if (smc->conn.lgr->is_smcd)
496 smcd_conn_save_peer_info(smc, clc);
497 else
498 smcr_conn_save_peer_info(smc, clc);
499 }
500
501 static void smc_link_save_peer_info(struct smc_link *link,
502 struct smc_clc_msg_accept_confirm *clc)
503 {
504 link->peer_qpn = ntoh24(clc->r0.qpn);
505 memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
506 memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
507 link->peer_psn = ntoh24(clc->r0.psn);
508 link->peer_mtu = clc->r0.qp_mtu;
509 }
510
511 static void smc_switch_to_fallback(struct smc_sock *smc)
512 {
513 smc->use_fallback = true;
514 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
515 smc->clcsock->file = smc->sk.sk_socket->file;
516 smc->clcsock->file->private_data = smc->clcsock;
517 smc->clcsock->wq.fasync_list =
518 smc->sk.sk_socket->wq.fasync_list;
519 }
520 }
521
522 /* fall back during connect */
523 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
524 {
525 smc_switch_to_fallback(smc);
526 smc->fallback_rsn = reason_code;
527 smc_copy_sock_settings_to_clc(smc);
528 smc->connect_nonblock = 0;
529 if (smc->sk.sk_state == SMC_INIT)
530 smc->sk.sk_state = SMC_ACTIVE;
531 return 0;
532 }
533
534 /* decline and fall back during connect */
535 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
536 u8 version)
537 {
538 int rc;
539
540 if (reason_code < 0) { /* error, fallback is not possible */
541 if (smc->sk.sk_state == SMC_INIT)
542 sock_put(&smc->sk); /* passive closing */
543 return reason_code;
544 }
545 if (reason_code != SMC_CLC_DECL_PEERDECL) {
546 rc = smc_clc_send_decline(smc, reason_code, version);
547 if (rc < 0) {
548 if (smc->sk.sk_state == SMC_INIT)
549 sock_put(&smc->sk); /* passive closing */
550 return rc;
551 }
552 }
553 return smc_connect_fallback(smc, reason_code);
554 }
555
556 static void smc_conn_abort(struct smc_sock *smc, int local_first)
557 {
558 if (local_first)
559 smc_lgr_cleanup_early(&smc->conn);
560 else
561 smc_conn_free(&smc->conn);
562 }
563
564 /* check if there is a rdma device available for this connection. */
565 /* called for connect and listen */
566 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
567 {
568 /* PNET table look up: search active ib_device and port
569 * within same PNETID that also contains the ethernet device
570 * used for the internal TCP socket
571 */
572 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
573 if (!ini->ib_dev)
574 return SMC_CLC_DECL_NOSMCRDEV;
575 return 0;
576 }
577
578 /* check if there is an ISM device available for this connection. */
579 /* called for connect and listen */
580 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
581 {
582 /* Find ISM device with same PNETID as connecting interface */
583 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
584 if (!ini->ism_dev[0])
585 return SMC_CLC_DECL_NOSMCDDEV;
586 else
587 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
588 return 0;
589 }
590
591 /* is chid unique for the ism devices that are already determined? */
592 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
593 int cnt)
594 {
595 int i = (!ini->ism_dev[0]) ? 1 : 0;
596
597 for (; i < cnt; i++)
598 if (ini->ism_chid[i] == chid)
599 return false;
600 return true;
601 }
602
603 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
604 * PNETID matching net_device)
605 */
606 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
607 struct smc_init_info *ini)
608 {
609 int rc = SMC_CLC_DECL_NOSMCDDEV;
610 struct smcd_dev *smcd;
611 int i = 1;
612 u16 chid;
613
614 if (smcd_indicated(ini->smc_type_v1))
615 rc = 0; /* already initialized for V1 */
616 mutex_lock(&smcd_dev_list.mutex);
617 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
618 if (smcd->going_away || smcd == ini->ism_dev[0])
619 continue;
620 chid = smc_ism_get_chid(smcd);
621 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
622 continue;
623 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
624 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
625 ini->ism_dev[i] = smcd;
626 ini->ism_chid[i] = chid;
627 ini->is_smcd = true;
628 rc = 0;
629 i++;
630 if (i > SMC_MAX_ISM_DEVS)
631 break;
632 }
633 }
634 mutex_unlock(&smcd_dev_list.mutex);
635 ini->ism_offered_cnt = i - 1;
636 if (!ini->ism_dev[0] && !ini->ism_dev[1])
637 ini->smcd_version = 0;
638
639 return rc;
640 }
641
642 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
643 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
644 struct smc_init_info *ini)
645 {
646 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
647 return SMC_CLC_DECL_ISMVLANERR;
648 return 0;
649 }
650
651 static int smc_find_proposal_devices(struct smc_sock *smc,
652 struct smc_init_info *ini)
653 {
654 int rc = 0;
655
656 /* check if there is an ism device available */
657 if (ini->smcd_version & SMC_V1) {
658 if (smc_find_ism_device(smc, ini) ||
659 smc_connect_ism_vlan_setup(smc, ini)) {
660 if (ini->smc_type_v1 == SMC_TYPE_B)
661 ini->smc_type_v1 = SMC_TYPE_R;
662 else
663 ini->smc_type_v1 = SMC_TYPE_N;
664 } /* else ISM V1 is supported for this connection */
665 if (smc_find_rdma_device(smc, ini)) {
666 if (ini->smc_type_v1 == SMC_TYPE_B)
667 ini->smc_type_v1 = SMC_TYPE_D;
668 else
669 ini->smc_type_v1 = SMC_TYPE_N;
670 } /* else RDMA is supported for this connection */
671 }
672 if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini))
673 ini->smc_type_v2 = SMC_TYPE_N;
674
675 /* if neither ISM nor RDMA are supported, fallback */
676 if (!smcr_indicated(ini->smc_type_v1) &&
677 ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
678 rc = SMC_CLC_DECL_NOSMCDEV;
679
680 return rc;
681 }
682
683 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
684 * used, the VLAN ID will be registered again during the connection setup.
685 */
686 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
687 struct smc_init_info *ini)
688 {
689 if (!smcd_indicated(ini->smc_type_v1))
690 return 0;
691 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
692 return SMC_CLC_DECL_CNFERR;
693 return 0;
694 }
695
696 #define SMC_CLC_MAX_ACCEPT_LEN \
697 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
698 sizeof(struct smc_clc_first_contact_ext) + \
699 sizeof(struct smc_clc_msg_trail))
700
701 /* CLC handshake during connect */
702 static int smc_connect_clc(struct smc_sock *smc,
703 struct smc_clc_msg_accept_confirm_v2 *aclc2,
704 struct smc_init_info *ini)
705 {
706 int rc = 0;
707
708 /* do inband token exchange */
709 rc = smc_clc_send_proposal(smc, ini);
710 if (rc)
711 return rc;
712 /* receive SMC Accept CLC message */
713 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
714 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
715 }
716
717 /* setup for RDMA connection of client */
718 static int smc_connect_rdma(struct smc_sock *smc,
719 struct smc_clc_msg_accept_confirm *aclc,
720 struct smc_init_info *ini)
721 {
722 int i, reason_code = 0;
723 struct smc_link *link;
724
725 ini->is_smcd = false;
726 ini->ib_lcl = &aclc->r0.lcl;
727 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
728 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
729
730 mutex_lock(&smc_client_lgr_pending);
731 reason_code = smc_conn_create(smc, ini);
732 if (reason_code) {
733 mutex_unlock(&smc_client_lgr_pending);
734 return reason_code;
735 }
736
737 smc_conn_save_peer_info(smc, aclc);
738
739 if (ini->first_contact_local) {
740 link = smc->conn.lnk;
741 } else {
742 /* set link that was assigned by server */
743 link = NULL;
744 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
745 struct smc_link *l = &smc->conn.lgr->lnk[i];
746
747 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
748 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
749 SMC_GID_SIZE) &&
750 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
751 sizeof(l->peer_mac))) {
752 link = l;
753 break;
754 }
755 }
756 if (!link) {
757 reason_code = SMC_CLC_DECL_NOSRVLINK;
758 goto connect_abort;
759 }
760 smc->conn.lnk = link;
761 }
762
763 /* create send buffer and rmb */
764 if (smc_buf_create(smc, false)) {
765 reason_code = SMC_CLC_DECL_MEM;
766 goto connect_abort;
767 }
768
769 if (ini->first_contact_local)
770 smc_link_save_peer_info(link, aclc);
771
772 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
773 reason_code = SMC_CLC_DECL_ERR_RTOK;
774 goto connect_abort;
775 }
776
777 smc_close_init(smc);
778 smc_rx_init(smc);
779
780 if (ini->first_contact_local) {
781 if (smc_ib_ready_link(link)) {
782 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
783 goto connect_abort;
784 }
785 } else {
786 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
787 reason_code = SMC_CLC_DECL_ERR_REGRMB;
788 goto connect_abort;
789 }
790 }
791 smc_rmb_sync_sg_for_device(&smc->conn);
792
793 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
794 SMC_V1);
795 if (reason_code)
796 goto connect_abort;
797
798 smc_tx_init(smc);
799
800 if (ini->first_contact_local) {
801 /* QP confirmation over RoCE fabric */
802 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
803 reason_code = smcr_clnt_conf_first_link(smc);
804 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
805 if (reason_code)
806 goto connect_abort;
807 }
808 mutex_unlock(&smc_client_lgr_pending);
809
810 smc_copy_sock_settings_to_clc(smc);
811 smc->connect_nonblock = 0;
812 if (smc->sk.sk_state == SMC_INIT)
813 smc->sk.sk_state = SMC_ACTIVE;
814
815 return 0;
816 connect_abort:
817 smc_conn_abort(smc, ini->first_contact_local);
818 mutex_unlock(&smc_client_lgr_pending);
819 smc->connect_nonblock = 0;
820
821 return reason_code;
822 }
823
824 /* The server has chosen one of the proposed ISM devices for the communication.
825 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
826 */
827 static int
828 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
829 struct smc_init_info *ini)
830 {
831 int i;
832
833 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
834 if (ini->ism_chid[i] == ntohs(aclc->chid)) {
835 ini->ism_selected = i;
836 return 0;
837 }
838 }
839
840 return -EPROTO;
841 }
842
843 /* setup for ISM connection of client */
844 static int smc_connect_ism(struct smc_sock *smc,
845 struct smc_clc_msg_accept_confirm *aclc,
846 struct smc_init_info *ini)
847 {
848 int rc = 0;
849
850 ini->is_smcd = true;
851 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
852
853 if (aclc->hdr.version == SMC_V2) {
854 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
855 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
856
857 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
858 if (rc)
859 return rc;
860 }
861 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
862
863 /* there is only one lgr role for SMC-D; use server lock */
864 mutex_lock(&smc_server_lgr_pending);
865 rc = smc_conn_create(smc, ini);
866 if (rc) {
867 mutex_unlock(&smc_server_lgr_pending);
868 return rc;
869 }
870
871 /* Create send and receive buffers */
872 rc = smc_buf_create(smc, true);
873 if (rc) {
874 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
875 goto connect_abort;
876 }
877
878 smc_conn_save_peer_info(smc, aclc);
879 smc_close_init(smc);
880 smc_rx_init(smc);
881 smc_tx_init(smc);
882
883 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
884 aclc->hdr.version);
885 if (rc)
886 goto connect_abort;
887 mutex_unlock(&smc_server_lgr_pending);
888
889 smc_copy_sock_settings_to_clc(smc);
890 smc->connect_nonblock = 0;
891 if (smc->sk.sk_state == SMC_INIT)
892 smc->sk.sk_state = SMC_ACTIVE;
893
894 return 0;
895 connect_abort:
896 smc_conn_abort(smc, ini->first_contact_local);
897 mutex_unlock(&smc_server_lgr_pending);
898 smc->connect_nonblock = 0;
899
900 return rc;
901 }
902
903 /* check if received accept type and version matches a proposed one */
904 static int smc_connect_check_aclc(struct smc_init_info *ini,
905 struct smc_clc_msg_accept_confirm *aclc)
906 {
907 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
908 !smcr_indicated(ini->smc_type_v1)) ||
909 (aclc->hdr.typev1 == SMC_TYPE_D &&
910 ((!smcd_indicated(ini->smc_type_v1) &&
911 !smcd_indicated(ini->smc_type_v2)) ||
912 (aclc->hdr.version == SMC_V1 &&
913 !smcd_indicated(ini->smc_type_v1)) ||
914 (aclc->hdr.version == SMC_V2 &&
915 !smcd_indicated(ini->smc_type_v2)))))
916 return SMC_CLC_DECL_MODEUNSUPP;
917
918 return 0;
919 }
920
921 /* perform steps before actually connecting */
922 static int __smc_connect(struct smc_sock *smc)
923 {
924 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
925 struct smc_clc_msg_accept_confirm_v2 *aclc2;
926 struct smc_clc_msg_accept_confirm *aclc;
927 struct smc_init_info *ini = NULL;
928 u8 *buf = NULL;
929 int rc = 0;
930
931 if (smc->use_fallback)
932 return smc_connect_fallback(smc, smc->fallback_rsn);
933
934 /* if peer has not signalled SMC-capability, fall back */
935 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
936 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
937
938 /* IPSec connections opt out of SMC optimizations */
939 if (using_ipsec(smc))
940 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
941 version);
942
943 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
944 if (!ini)
945 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
946 version);
947
948 ini->smcd_version = SMC_V1;
949 ini->smcd_version |= smc_ism_is_v2_capable() ? SMC_V2 : 0;
950 ini->smc_type_v1 = SMC_TYPE_B;
951 ini->smc_type_v2 = smc_ism_is_v2_capable() ? SMC_TYPE_D : SMC_TYPE_N;
952
953 /* get vlan id from IP device */
954 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
955 ini->smcd_version &= ~SMC_V1;
956 ini->smc_type_v1 = SMC_TYPE_N;
957 if (!ini->smcd_version) {
958 rc = SMC_CLC_DECL_GETVLANERR;
959 goto fallback;
960 }
961 }
962
963 rc = smc_find_proposal_devices(smc, ini);
964 if (rc)
965 goto fallback;
966
967 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
968 if (!buf) {
969 rc = SMC_CLC_DECL_MEM;
970 goto fallback;
971 }
972 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
973 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
974
975 /* perform CLC handshake */
976 rc = smc_connect_clc(smc, aclc2, ini);
977 if (rc)
978 goto vlan_cleanup;
979
980 /* check if smc modes and versions of CLC proposal and accept match */
981 rc = smc_connect_check_aclc(ini, aclc);
982 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
983 ini->smcd_version = version;
984 if (rc)
985 goto vlan_cleanup;
986
987 /* depending on previous steps, connect using rdma or ism */
988 if (aclc->hdr.typev1 == SMC_TYPE_R)
989 rc = smc_connect_rdma(smc, aclc, ini);
990 else if (aclc->hdr.typev1 == SMC_TYPE_D)
991 rc = smc_connect_ism(smc, aclc, ini);
992 if (rc)
993 goto vlan_cleanup;
994
995 smc_connect_ism_vlan_cleanup(smc, ini);
996 kfree(buf);
997 kfree(ini);
998 return 0;
999
1000 vlan_cleanup:
1001 smc_connect_ism_vlan_cleanup(smc, ini);
1002 kfree(buf);
1003 fallback:
1004 kfree(ini);
1005 return smc_connect_decline_fallback(smc, rc, version);
1006 }
1007
1008 static void smc_connect_work(struct work_struct *work)
1009 {
1010 struct smc_sock *smc = container_of(work, struct smc_sock,
1011 connect_work);
1012 long timeo = smc->sk.sk_sndtimeo;
1013 int rc = 0;
1014
1015 if (!timeo)
1016 timeo = MAX_SCHEDULE_TIMEOUT;
1017 lock_sock(smc->clcsock->sk);
1018 if (smc->clcsock->sk->sk_err) {
1019 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1020 } else if ((1 << smc->clcsock->sk->sk_state) &
1021 (TCPF_SYN_SENT | TCP_SYN_RECV)) {
1022 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1023 if ((rc == -EPIPE) &&
1024 ((1 << smc->clcsock->sk->sk_state) &
1025 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1026 rc = 0;
1027 }
1028 release_sock(smc->clcsock->sk);
1029 lock_sock(&smc->sk);
1030 if (rc != 0 || smc->sk.sk_err) {
1031 smc->sk.sk_state = SMC_CLOSED;
1032 if (rc == -EPIPE || rc == -EAGAIN)
1033 smc->sk.sk_err = EPIPE;
1034 else if (signal_pending(current))
1035 smc->sk.sk_err = -sock_intr_errno(timeo);
1036 sock_put(&smc->sk); /* passive closing */
1037 goto out;
1038 }
1039
1040 rc = __smc_connect(smc);
1041 if (rc < 0)
1042 smc->sk.sk_err = -rc;
1043
1044 out:
1045 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1046 if (smc->sk.sk_err) {
1047 smc->sk.sk_state_change(&smc->sk);
1048 } else { /* allow polling before and after fallback decision */
1049 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1050 smc->sk.sk_write_space(&smc->sk);
1051 }
1052 }
1053 release_sock(&smc->sk);
1054 }
1055
1056 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1057 int alen, int flags)
1058 {
1059 struct sock *sk = sock->sk;
1060 struct smc_sock *smc;
1061 int rc = -EINVAL;
1062
1063 smc = smc_sk(sk);
1064
1065 /* separate smc parameter checking to be safe */
1066 if (alen < sizeof(addr->sa_family))
1067 goto out_err;
1068 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1069 goto out_err;
1070
1071 lock_sock(sk);
1072 switch (sk->sk_state) {
1073 default:
1074 goto out;
1075 case SMC_ACTIVE:
1076 rc = -EISCONN;
1077 goto out;
1078 case SMC_INIT:
1079 rc = 0;
1080 break;
1081 }
1082
1083 smc_copy_sock_settings_to_clc(smc);
1084 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1085 if (smc->connect_nonblock) {
1086 rc = -EALREADY;
1087 goto out;
1088 }
1089 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1090 if (rc && rc != -EINPROGRESS)
1091 goto out;
1092
1093 sock_hold(&smc->sk); /* sock put in passive closing */
1094 if (smc->use_fallback)
1095 goto out;
1096 if (flags & O_NONBLOCK) {
1097 if (queue_work(smc_hs_wq, &smc->connect_work))
1098 smc->connect_nonblock = 1;
1099 rc = -EINPROGRESS;
1100 } else {
1101 rc = __smc_connect(smc);
1102 if (rc < 0)
1103 goto out;
1104 else
1105 rc = 0; /* success cases including fallback */
1106 }
1107
1108 out:
1109 release_sock(sk);
1110 out_err:
1111 return rc;
1112 }
1113
1114 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1115 {
1116 struct socket *new_clcsock = NULL;
1117 struct sock *lsk = &lsmc->sk;
1118 struct sock *new_sk;
1119 int rc = -EINVAL;
1120
1121 release_sock(lsk);
1122 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1123 if (!new_sk) {
1124 rc = -ENOMEM;
1125 lsk->sk_err = ENOMEM;
1126 *new_smc = NULL;
1127 lock_sock(lsk);
1128 goto out;
1129 }
1130 *new_smc = smc_sk(new_sk);
1131
1132 mutex_lock(&lsmc->clcsock_release_lock);
1133 if (lsmc->clcsock)
1134 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1135 mutex_unlock(&lsmc->clcsock_release_lock);
1136 lock_sock(lsk);
1137 if (rc < 0 && rc != -EAGAIN)
1138 lsk->sk_err = -rc;
1139 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1140 new_sk->sk_prot->unhash(new_sk);
1141 if (new_clcsock)
1142 sock_release(new_clcsock);
1143 new_sk->sk_state = SMC_CLOSED;
1144 sock_set_flag(new_sk, SOCK_DEAD);
1145 sock_put(new_sk); /* final */
1146 *new_smc = NULL;
1147 goto out;
1148 }
1149
1150 /* new clcsock has inherited the smc listen-specific sk_data_ready
1151 * function; switch it back to the original sk_data_ready function
1152 */
1153 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1154 (*new_smc)->clcsock = new_clcsock;
1155 out:
1156 return rc;
1157 }
1158
1159 /* add a just created sock to the accept queue of the listen sock as
1160 * candidate for a following socket accept call from user space
1161 */
1162 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1163 {
1164 struct smc_sock *par = smc_sk(parent);
1165
1166 sock_hold(sk); /* sock_put in smc_accept_unlink () */
1167 spin_lock(&par->accept_q_lock);
1168 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1169 spin_unlock(&par->accept_q_lock);
1170 sk_acceptq_added(parent);
1171 }
1172
1173 /* remove a socket from the accept queue of its parental listening socket */
1174 static void smc_accept_unlink(struct sock *sk)
1175 {
1176 struct smc_sock *par = smc_sk(sk)->listen_smc;
1177
1178 spin_lock(&par->accept_q_lock);
1179 list_del_init(&smc_sk(sk)->accept_q);
1180 spin_unlock(&par->accept_q_lock);
1181 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1182 sock_put(sk); /* sock_hold in smc_accept_enqueue */
1183 }
1184
1185 /* remove a sock from the accept queue to bind it to a new socket created
1186 * for a socket accept call from user space
1187 */
1188 struct sock *smc_accept_dequeue(struct sock *parent,
1189 struct socket *new_sock)
1190 {
1191 struct smc_sock *isk, *n;
1192 struct sock *new_sk;
1193
1194 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1195 new_sk = (struct sock *)isk;
1196
1197 smc_accept_unlink(new_sk);
1198 if (new_sk->sk_state == SMC_CLOSED) {
1199 new_sk->sk_prot->unhash(new_sk);
1200 if (isk->clcsock) {
1201 sock_release(isk->clcsock);
1202 isk->clcsock = NULL;
1203 }
1204 sock_put(new_sk); /* final */
1205 continue;
1206 }
1207 if (new_sock) {
1208 sock_graft(new_sk, new_sock);
1209 if (isk->use_fallback) {
1210 smc_sk(new_sk)->clcsock->file = new_sock->file;
1211 isk->clcsock->file->private_data = isk->clcsock;
1212 }
1213 }
1214 return new_sk;
1215 }
1216 return NULL;
1217 }
1218
1219 /* clean up for a created but never accepted sock */
1220 void smc_close_non_accepted(struct sock *sk)
1221 {
1222 struct smc_sock *smc = smc_sk(sk);
1223
1224 sock_hold(sk); /* sock_put below */
1225 lock_sock(sk);
1226 if (!sk->sk_lingertime)
1227 /* wait for peer closing */
1228 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
1229 __smc_release(smc);
1230 release_sock(sk);
1231 sock_put(sk); /* sock_hold above */
1232 sock_put(sk); /* final sock_put */
1233 }
1234
1235 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1236 {
1237 struct smc_link *link = smc->conn.lnk;
1238 struct smc_llc_qentry *qentry;
1239 int rc;
1240
1241 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
1242 return SMC_CLC_DECL_ERR_REGRMB;
1243
1244 /* send CONFIRM LINK request to client over the RoCE fabric */
1245 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1246 if (rc < 0)
1247 return SMC_CLC_DECL_TIMEOUT_CL;
1248
1249 /* receive CONFIRM LINK response from client over the RoCE fabric */
1250 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1251 SMC_LLC_CONFIRM_LINK);
1252 if (!qentry) {
1253 struct smc_clc_msg_decline dclc;
1254
1255 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1256 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1257 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1258 }
1259 smc_llc_save_peer_uid(qentry);
1260 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1261 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1262 if (rc)
1263 return SMC_CLC_DECL_RMBE_EC;
1264
1265 /* confirm_rkey is implicit on 1st contact */
1266 smc->conn.rmb_desc->is_conf_rkey = true;
1267
1268 smc_llc_link_active(link);
1269 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1270
1271 /* initial contact - try to establish second link */
1272 smc_llc_srv_add_link(link);
1273 return 0;
1274 }
1275
1276 /* listen worker: finish */
1277 static void smc_listen_out(struct smc_sock *new_smc)
1278 {
1279 struct smc_sock *lsmc = new_smc->listen_smc;
1280 struct sock *newsmcsk = &new_smc->sk;
1281
1282 if (lsmc->sk.sk_state == SMC_LISTEN) {
1283 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1284 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1285 release_sock(&lsmc->sk);
1286 } else { /* no longer listening */
1287 smc_close_non_accepted(newsmcsk);
1288 }
1289
1290 /* Wake up accept */
1291 lsmc->sk.sk_data_ready(&lsmc->sk);
1292 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1293 }
1294
1295 /* listen worker: finish in state connected */
1296 static void smc_listen_out_connected(struct smc_sock *new_smc)
1297 {
1298 struct sock *newsmcsk = &new_smc->sk;
1299
1300 sk_refcnt_debug_inc(newsmcsk);
1301 if (newsmcsk->sk_state == SMC_INIT)
1302 newsmcsk->sk_state = SMC_ACTIVE;
1303
1304 smc_listen_out(new_smc);
1305 }
1306
1307 /* listen worker: finish in error state */
1308 static void smc_listen_out_err(struct smc_sock *new_smc)
1309 {
1310 struct sock *newsmcsk = &new_smc->sk;
1311
1312 if (newsmcsk->sk_state == SMC_INIT)
1313 sock_put(&new_smc->sk); /* passive closing */
1314 newsmcsk->sk_state = SMC_CLOSED;
1315
1316 smc_listen_out(new_smc);
1317 }
1318
1319 /* listen worker: decline and fall back if possible */
1320 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1321 int local_first, u8 version)
1322 {
1323 /* RDMA setup failed, switch back to TCP */
1324 smc_conn_abort(new_smc, local_first);
1325 if (reason_code < 0) { /* error, no fallback possible */
1326 smc_listen_out_err(new_smc);
1327 return;
1328 }
1329 smc_switch_to_fallback(new_smc);
1330 new_smc->fallback_rsn = reason_code;
1331 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1332 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1333 smc_listen_out_err(new_smc);
1334 return;
1335 }
1336 }
1337 smc_listen_out_connected(new_smc);
1338 }
1339
1340 /* listen worker: version checking */
1341 static int smc_listen_v2_check(struct smc_sock *new_smc,
1342 struct smc_clc_msg_proposal *pclc,
1343 struct smc_init_info *ini)
1344 {
1345 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1346 struct smc_clc_v2_extension *pclc_v2_ext;
1347 int rc = SMC_CLC_DECL_PEERNOSMC;
1348
1349 ini->smc_type_v1 = pclc->hdr.typev1;
1350 ini->smc_type_v2 = pclc->hdr.typev2;
1351 ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0;
1352 if (pclc->hdr.version > SMC_V1)
1353 ini->smcd_version |=
1354 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0;
1355 if (!(ini->smcd_version & SMC_V2)) {
1356 rc = SMC_CLC_DECL_PEERNOSMC;
1357 goto out;
1358 }
1359 if (!smc_ism_is_v2_capable()) {
1360 ini->smcd_version &= ~SMC_V2;
1361 rc = SMC_CLC_DECL_NOISM2SUPP;
1362 goto out;
1363 }
1364 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1365 if (!pclc_v2_ext) {
1366 ini->smcd_version &= ~SMC_V2;
1367 rc = SMC_CLC_DECL_NOV2EXT;
1368 goto out;
1369 }
1370 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
1371 if (!pclc_smcd_v2_ext) {
1372 ini->smcd_version &= ~SMC_V2;
1373 rc = SMC_CLC_DECL_NOV2DEXT;
1374 }
1375
1376 out:
1377 if (!ini->smcd_version)
1378 return rc;
1379
1380 return 0;
1381 }
1382
1383 /* listen worker: check prefixes */
1384 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1385 struct smc_clc_msg_proposal *pclc)
1386 {
1387 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1388 struct socket *newclcsock = new_smc->clcsock;
1389
1390 if (pclc->hdr.typev1 == SMC_TYPE_N)
1391 return 0;
1392 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1393 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1394 return SMC_CLC_DECL_DIFFPREFIX;
1395
1396 return 0;
1397 }
1398
1399 /* listen worker: initialize connection and buffers */
1400 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1401 struct smc_init_info *ini)
1402 {
1403 int rc;
1404
1405 /* allocate connection / link group */
1406 rc = smc_conn_create(new_smc, ini);
1407 if (rc)
1408 return rc;
1409
1410 /* create send buffer and rmb */
1411 if (smc_buf_create(new_smc, false))
1412 return SMC_CLC_DECL_MEM;
1413
1414 return 0;
1415 }
1416
1417 /* listen worker: initialize connection and buffers for SMC-D */
1418 static int smc_listen_ism_init(struct smc_sock *new_smc,
1419 struct smc_init_info *ini)
1420 {
1421 int rc;
1422
1423 rc = smc_conn_create(new_smc, ini);
1424 if (rc)
1425 return rc;
1426
1427 /* Create send and receive buffers */
1428 rc = smc_buf_create(new_smc, true);
1429 if (rc) {
1430 smc_conn_abort(new_smc, ini->first_contact_local);
1431 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1432 SMC_CLC_DECL_MEM;
1433 }
1434
1435 return 0;
1436 }
1437
1438 static bool smc_is_already_selected(struct smcd_dev *smcd,
1439 struct smc_init_info *ini,
1440 int matches)
1441 {
1442 int i;
1443
1444 for (i = 0; i < matches; i++)
1445 if (smcd == ini->ism_dev[i])
1446 return true;
1447
1448 return false;
1449 }
1450
1451 /* check for ISM devices matching proposed ISM devices */
1452 static void smc_check_ism_v2_match(struct smc_init_info *ini,
1453 u16 proposed_chid, u64 proposed_gid,
1454 unsigned int *matches)
1455 {
1456 struct smcd_dev *smcd;
1457
1458 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1459 if (smcd->going_away)
1460 continue;
1461 if (smc_is_already_selected(smcd, ini, *matches))
1462 continue;
1463 if (smc_ism_get_chid(smcd) == proposed_chid &&
1464 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1465 ini->ism_peer_gid[*matches] = proposed_gid;
1466 ini->ism_dev[*matches] = smcd;
1467 (*matches)++;
1468 break;
1469 }
1470 }
1471 }
1472
1473 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
1474 {
1475 if (!ini->rc)
1476 ini->rc = rc;
1477 }
1478
1479 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
1480 struct smc_clc_msg_proposal *pclc,
1481 struct smc_init_info *ini)
1482 {
1483 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
1484 struct smc_clc_v2_extension *smc_v2_ext;
1485 struct smc_clc_msg_smcd *pclc_smcd;
1486 unsigned int matches = 0;
1487 u8 smcd_version;
1488 u8 *eid = NULL;
1489 int i, rc;
1490
1491 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
1492 goto not_found;
1493
1494 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1495 smc_v2_ext = smc_get_clc_v2_ext(pclc);
1496 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
1497 if (!smcd_v2_ext ||
1498 !smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */
1499 smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini);
1500 goto not_found;
1501 }
1502
1503 mutex_lock(&smcd_dev_list.mutex);
1504 if (pclc_smcd->ism.chid)
1505 /* check for ISM device matching proposed native ISM device */
1506 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
1507 ntohll(pclc_smcd->ism.gid), &matches);
1508 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
1509 /* check for ISM devices matching proposed non-native ISM
1510 * devices
1511 */
1512 smc_check_ism_v2_match(ini,
1513 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
1514 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
1515 &matches);
1516 }
1517 mutex_unlock(&smcd_dev_list.mutex);
1518
1519 if (ini->ism_dev[0]) {
1520 smc_ism_get_system_eid(ini->ism_dev[0], &eid);
1521 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN))
1522 goto not_found;
1523 } else {
1524 goto not_found;
1525 }
1526
1527 /* separate - outside the smcd_dev_list.lock */
1528 smcd_version = ini->smcd_version;
1529 for (i = 0; i < matches; i++) {
1530 ini->smcd_version = SMC_V2;
1531 ini->is_smcd = true;
1532 ini->ism_selected = i;
1533 rc = smc_listen_ism_init(new_smc, ini);
1534 if (rc) {
1535 smc_find_ism_store_rc(rc, ini);
1536 /* try next active ISM device */
1537 continue;
1538 }
1539 return; /* matching and usable V2 ISM device found */
1540 }
1541 /* no V2 ISM device could be initialized */
1542 ini->smcd_version = smcd_version; /* restore original value */
1543
1544 not_found:
1545 ini->smcd_version &= ~SMC_V2;
1546 ini->ism_dev[0] = NULL;
1547 ini->is_smcd = false;
1548 }
1549
1550 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
1551 struct smc_clc_msg_proposal *pclc,
1552 struct smc_init_info *ini)
1553 {
1554 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
1555 int rc = 0;
1556
1557 /* check if ISM V1 is available */
1558 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
1559 goto not_found;
1560 ini->is_smcd = true; /* prepare ISM check */
1561 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
1562 rc = smc_find_ism_device(new_smc, ini);
1563 if (rc)
1564 goto not_found;
1565 ini->ism_selected = 0;
1566 rc = smc_listen_ism_init(new_smc, ini);
1567 if (!rc)
1568 return; /* V1 ISM device found */
1569
1570 not_found:
1571 smc_find_ism_store_rc(rc, ini);
1572 ini->ism_dev[0] = NULL;
1573 ini->is_smcd = false;
1574 }
1575
1576 /* listen worker: register buffers */
1577 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
1578 {
1579 struct smc_connection *conn = &new_smc->conn;
1580
1581 if (!local_first) {
1582 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
1583 return SMC_CLC_DECL_ERR_REGRMB;
1584 }
1585 smc_rmb_sync_sg_for_device(&new_smc->conn);
1586
1587 return 0;
1588 }
1589
1590 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
1591 struct smc_clc_msg_proposal *pclc,
1592 struct smc_init_info *ini)
1593 {
1594 int rc;
1595
1596 if (!smcr_indicated(ini->smc_type_v1))
1597 return SMC_CLC_DECL_NOSMCDEV;
1598
1599 /* prepare RDMA check */
1600 ini->ib_lcl = &pclc->lcl;
1601 rc = smc_find_rdma_device(new_smc, ini);
1602 if (rc) {
1603 /* no RDMA device found */
1604 if (ini->smc_type_v1 == SMC_TYPE_B)
1605 /* neither ISM nor RDMA device found */
1606 rc = SMC_CLC_DECL_NOSMCDEV;
1607 return rc;
1608 }
1609 rc = smc_listen_rdma_init(new_smc, ini);
1610 if (rc)
1611 return rc;
1612 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1613 }
1614
1615 /* determine the local device matching to proposal */
1616 static int smc_listen_find_device(struct smc_sock *new_smc,
1617 struct smc_clc_msg_proposal *pclc,
1618 struct smc_init_info *ini)
1619 {
1620 int rc;
1621
1622 /* check for ISM device matching V2 proposed device */
1623 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
1624 if (ini->ism_dev[0])
1625 return 0;
1626
1627 if (!(ini->smcd_version & SMC_V1))
1628 return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV;
1629
1630 /* check for matching IP prefix and subnet length */
1631 rc = smc_listen_prfx_check(new_smc, pclc);
1632 if (rc)
1633 return ini->rc ?: rc;
1634
1635 /* get vlan id from IP device */
1636 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
1637 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
1638
1639 /* check for ISM device matching V1 proposed device */
1640 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
1641 if (ini->ism_dev[0])
1642 return 0;
1643
1644 if (pclc->hdr.typev1 == SMC_TYPE_D)
1645 /* skip RDMA and decline */
1646 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
1647
1648 /* check if RDMA is available */
1649 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
1650 smc_find_ism_store_rc(rc, ini);
1651
1652 return (!rc) ? 0 : ini->rc;
1653 }
1654
1655 /* listen worker: finish RDMA setup */
1656 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1657 struct smc_clc_msg_accept_confirm *cclc,
1658 bool local_first)
1659 {
1660 struct smc_link *link = new_smc->conn.lnk;
1661 int reason_code = 0;
1662
1663 if (local_first)
1664 smc_link_save_peer_info(link, cclc);
1665
1666 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
1667 return SMC_CLC_DECL_ERR_RTOK;
1668
1669 if (local_first) {
1670 if (smc_ib_ready_link(link))
1671 return SMC_CLC_DECL_ERR_RDYLNK;
1672 /* QP confirmation over RoCE fabric */
1673 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1674 reason_code = smcr_serv_conf_first_link(new_smc);
1675 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1676 }
1677 return reason_code;
1678 }
1679
1680 /* setup for connection of server */
1681 static void smc_listen_work(struct work_struct *work)
1682 {
1683 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1684 smc_listen_work);
1685 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1686 struct socket *newclcsock = new_smc->clcsock;
1687 struct smc_clc_msg_accept_confirm *cclc;
1688 struct smc_clc_msg_proposal_area *buf;
1689 struct smc_clc_msg_proposal *pclc;
1690 struct smc_init_info *ini = NULL;
1691 int rc = 0;
1692
1693 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1694 return smc_listen_out_err(new_smc);
1695
1696 if (new_smc->use_fallback) {
1697 smc_listen_out_connected(new_smc);
1698 return;
1699 }
1700
1701 /* check if peer is smc capable */
1702 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1703 smc_switch_to_fallback(new_smc);
1704 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1705 smc_listen_out_connected(new_smc);
1706 return;
1707 }
1708
1709 /* do inband token exchange -
1710 * wait for and receive SMC Proposal CLC message
1711 */
1712 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1713 if (!buf) {
1714 rc = SMC_CLC_DECL_MEM;
1715 goto out_decl;
1716 }
1717 pclc = (struct smc_clc_msg_proposal *)buf;
1718 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
1719 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1720 if (rc)
1721 goto out_decl;
1722 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version;
1723
1724 /* IPSec connections opt out of SMC optimizations */
1725 if (using_ipsec(new_smc)) {
1726 rc = SMC_CLC_DECL_IPSEC;
1727 goto out_decl;
1728 }
1729
1730 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1731 if (!ini) {
1732 rc = SMC_CLC_DECL_MEM;
1733 goto out_decl;
1734 }
1735
1736 /* initial version checking */
1737 rc = smc_listen_v2_check(new_smc, pclc, ini);
1738 if (rc)
1739 goto out_decl;
1740
1741 mutex_lock(&smc_server_lgr_pending);
1742 smc_close_init(new_smc);
1743 smc_rx_init(new_smc);
1744 smc_tx_init(new_smc);
1745
1746 /* determine ISM or RoCE device used for connection */
1747 rc = smc_listen_find_device(new_smc, pclc, ini);
1748 if (rc)
1749 goto out_unlock;
1750
1751 /* send SMC Accept CLC message */
1752 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
1753 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1);
1754 if (rc)
1755 goto out_unlock;
1756
1757 /* SMC-D does not need this lock any more */
1758 if (ini->is_smcd)
1759 mutex_unlock(&smc_server_lgr_pending);
1760
1761 /* receive SMC Confirm CLC message */
1762 memset(buf, 0, sizeof(*buf));
1763 cclc = (struct smc_clc_msg_accept_confirm *)buf;
1764 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
1765 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1766 if (rc) {
1767 if (!ini->is_smcd)
1768 goto out_unlock;
1769 goto out_decl;
1770 }
1771
1772 /* finish worker */
1773 if (!ini->is_smcd) {
1774 rc = smc_listen_rdma_finish(new_smc, cclc,
1775 ini->first_contact_local);
1776 if (rc)
1777 goto out_unlock;
1778 mutex_unlock(&smc_server_lgr_pending);
1779 }
1780 smc_conn_save_peer_info(new_smc, cclc);
1781 smc_listen_out_connected(new_smc);
1782 goto out_free;
1783
1784 out_unlock:
1785 mutex_unlock(&smc_server_lgr_pending);
1786 out_decl:
1787 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
1788 version);
1789 out_free:
1790 kfree(ini);
1791 kfree(buf);
1792 }
1793
1794 static void smc_tcp_listen_work(struct work_struct *work)
1795 {
1796 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1797 tcp_listen_work);
1798 struct sock *lsk = &lsmc->sk;
1799 struct smc_sock *new_smc;
1800 int rc = 0;
1801
1802 lock_sock(lsk);
1803 while (lsk->sk_state == SMC_LISTEN) {
1804 rc = smc_clcsock_accept(lsmc, &new_smc);
1805 if (rc) /* clcsock accept queue empty or error */
1806 goto out;
1807 if (!new_smc)
1808 continue;
1809
1810 new_smc->listen_smc = lsmc;
1811 new_smc->use_fallback = lsmc->use_fallback;
1812 new_smc->fallback_rsn = lsmc->fallback_rsn;
1813 sock_hold(lsk); /* sock_put in smc_listen_work */
1814 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1815 smc_copy_sock_settings_to_smc(new_smc);
1816 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1817 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1818 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1819 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
1820 sock_put(&new_smc->sk);
1821 }
1822
1823 out:
1824 release_sock(lsk);
1825 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
1826 }
1827
1828 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
1829 {
1830 struct smc_sock *lsmc;
1831
1832 lsmc = (struct smc_sock *)
1833 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY);
1834 if (!lsmc)
1835 return;
1836 lsmc->clcsk_data_ready(listen_clcsock);
1837 if (lsmc->sk.sk_state == SMC_LISTEN) {
1838 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
1839 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work))
1840 sock_put(&lsmc->sk);
1841 }
1842 }
1843
1844 static int smc_listen(struct socket *sock, int backlog)
1845 {
1846 struct sock *sk = sock->sk;
1847 struct smc_sock *smc;
1848 int rc;
1849
1850 smc = smc_sk(sk);
1851 lock_sock(sk);
1852
1853 rc = -EINVAL;
1854 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1855 smc->connect_nonblock)
1856 goto out;
1857
1858 rc = 0;
1859 if (sk->sk_state == SMC_LISTEN) {
1860 sk->sk_max_ack_backlog = backlog;
1861 goto out;
1862 }
1863 /* some socket options are handled in core, so we could not apply
1864 * them to the clc socket -- copy smc socket options to clc socket
1865 */
1866 smc_copy_sock_settings_to_clc(smc);
1867 if (!smc->use_fallback)
1868 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1869
1870 /* save original sk_data_ready function and establish
1871 * smc-specific sk_data_ready function
1872 */
1873 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready;
1874 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready;
1875 smc->clcsock->sk->sk_user_data =
1876 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
1877 rc = kernel_listen(smc->clcsock, backlog);
1878 if (rc)
1879 goto out;
1880 sk->sk_max_ack_backlog = backlog;
1881 sk->sk_ack_backlog = 0;
1882 sk->sk_state = SMC_LISTEN;
1883
1884 out:
1885 release_sock(sk);
1886 return rc;
1887 }
1888
1889 static int smc_accept(struct socket *sock, struct socket *new_sock,
1890 int flags, bool kern)
1891 {
1892 struct sock *sk = sock->sk, *nsk;
1893 DECLARE_WAITQUEUE(wait, current);
1894 struct smc_sock *lsmc;
1895 long timeo;
1896 int rc = 0;
1897
1898 lsmc = smc_sk(sk);
1899 sock_hold(sk); /* sock_put below */
1900 lock_sock(sk);
1901
1902 if (lsmc->sk.sk_state != SMC_LISTEN) {
1903 rc = -EINVAL;
1904 release_sock(sk);
1905 goto out;
1906 }
1907
1908 /* Wait for an incoming connection */
1909 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1910 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1911 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1912 set_current_state(TASK_INTERRUPTIBLE);
1913 if (!timeo) {
1914 rc = -EAGAIN;
1915 break;
1916 }
1917 release_sock(sk);
1918 timeo = schedule_timeout(timeo);
1919 /* wakeup by sk_data_ready in smc_listen_work() */
1920 sched_annotate_sleep();
1921 lock_sock(sk);
1922 if (signal_pending(current)) {
1923 rc = sock_intr_errno(timeo);
1924 break;
1925 }
1926 }
1927 set_current_state(TASK_RUNNING);
1928 remove_wait_queue(sk_sleep(sk), &wait);
1929
1930 if (!rc)
1931 rc = sock_error(nsk);
1932 release_sock(sk);
1933 if (rc)
1934 goto out;
1935
1936 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1937 /* wait till data arrives on the socket */
1938 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1939 MSEC_PER_SEC);
1940 if (smc_sk(nsk)->use_fallback) {
1941 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1942
1943 lock_sock(clcsk);
1944 if (skb_queue_empty(&clcsk->sk_receive_queue))
1945 sk_wait_data(clcsk, &timeo, NULL);
1946 release_sock(clcsk);
1947 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1948 lock_sock(nsk);
1949 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1950 release_sock(nsk);
1951 }
1952 }
1953
1954 out:
1955 sock_put(sk); /* sock_hold above */
1956 return rc;
1957 }
1958
1959 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1960 int peer)
1961 {
1962 struct smc_sock *smc;
1963
1964 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1965 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1966 return -ENOTCONN;
1967
1968 smc = smc_sk(sock->sk);
1969
1970 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1971 }
1972
1973 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1974 {
1975 struct sock *sk = sock->sk;
1976 struct smc_sock *smc;
1977 int rc = -EPIPE;
1978
1979 smc = smc_sk(sk);
1980 lock_sock(sk);
1981 if ((sk->sk_state != SMC_ACTIVE) &&
1982 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1983 (sk->sk_state != SMC_INIT))
1984 goto out;
1985
1986 if (msg->msg_flags & MSG_FASTOPEN) {
1987 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1988 smc_switch_to_fallback(smc);
1989 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1990 } else {
1991 rc = -EINVAL;
1992 goto out;
1993 }
1994 }
1995
1996 if (smc->use_fallback)
1997 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1998 else
1999 rc = smc_tx_sendmsg(smc, msg, len);
2000 out:
2001 release_sock(sk);
2002 return rc;
2003 }
2004
2005 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2006 int flags)
2007 {
2008 struct sock *sk = sock->sk;
2009 struct smc_sock *smc;
2010 int rc = -ENOTCONN;
2011
2012 smc = smc_sk(sk);
2013 lock_sock(sk);
2014 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2015 /* socket was connected before, no more data to read */
2016 rc = 0;
2017 goto out;
2018 }
2019 if ((sk->sk_state == SMC_INIT) ||
2020 (sk->sk_state == SMC_LISTEN) ||
2021 (sk->sk_state == SMC_CLOSED))
2022 goto out;
2023
2024 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2025 rc = 0;
2026 goto out;
2027 }
2028
2029 if (smc->use_fallback) {
2030 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2031 } else {
2032 msg->msg_namelen = 0;
2033 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2034 }
2035
2036 out:
2037 release_sock(sk);
2038 return rc;
2039 }
2040
2041 static __poll_t smc_accept_poll(struct sock *parent)
2042 {
2043 struct smc_sock *isk = smc_sk(parent);
2044 __poll_t mask = 0;
2045
2046 spin_lock(&isk->accept_q_lock);
2047 if (!list_empty(&isk->accept_q))
2048 mask = EPOLLIN | EPOLLRDNORM;
2049 spin_unlock(&isk->accept_q_lock);
2050
2051 return mask;
2052 }
2053
2054 static __poll_t smc_poll(struct file *file, struct socket *sock,
2055 poll_table *wait)
2056 {
2057 struct sock *sk = sock->sk;
2058 struct smc_sock *smc;
2059 __poll_t mask = 0;
2060
2061 if (!sk)
2062 return EPOLLNVAL;
2063
2064 smc = smc_sk(sock->sk);
2065 if (smc->use_fallback) {
2066 /* delegate to CLC child sock */
2067 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2068 sk->sk_err = smc->clcsock->sk->sk_err;
2069 } else {
2070 if (sk->sk_state != SMC_CLOSED)
2071 sock_poll_wait(file, sock, wait);
2072 if (sk->sk_err)
2073 mask |= EPOLLERR;
2074 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2075 (sk->sk_state == SMC_CLOSED))
2076 mask |= EPOLLHUP;
2077 if (sk->sk_state == SMC_LISTEN) {
2078 /* woken up by sk_data_ready in smc_listen_work() */
2079 mask |= smc_accept_poll(sk);
2080 } else if (smc->use_fallback) { /* as result of connect_work()*/
2081 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2082 wait);
2083 sk->sk_err = smc->clcsock->sk->sk_err;
2084 } else {
2085 if ((sk->sk_state != SMC_INIT &&
2086 atomic_read(&smc->conn.sndbuf_space)) ||
2087 sk->sk_shutdown & SEND_SHUTDOWN) {
2088 mask |= EPOLLOUT | EPOLLWRNORM;
2089 } else {
2090 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2091 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2092 }
2093 if (atomic_read(&smc->conn.bytes_to_rcv))
2094 mask |= EPOLLIN | EPOLLRDNORM;
2095 if (sk->sk_shutdown & RCV_SHUTDOWN)
2096 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2097 if (sk->sk_state == SMC_APPCLOSEWAIT1)
2098 mask |= EPOLLIN;
2099 if (smc->conn.urg_state == SMC_URG_VALID)
2100 mask |= EPOLLPRI;
2101 }
2102 }
2103
2104 return mask;
2105 }
2106
2107 static int smc_shutdown(struct socket *sock, int how)
2108 {
2109 struct sock *sk = sock->sk;
2110 struct smc_sock *smc;
2111 int rc = -EINVAL;
2112 int rc1 = 0;
2113
2114 smc = smc_sk(sk);
2115
2116 if ((how < SHUT_RD) || (how > SHUT_RDWR))
2117 return rc;
2118
2119 lock_sock(sk);
2120
2121 rc = -ENOTCONN;
2122 if ((sk->sk_state != SMC_ACTIVE) &&
2123 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2124 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2125 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2126 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2127 (sk->sk_state != SMC_APPFINCLOSEWAIT))
2128 goto out;
2129 if (smc->use_fallback) {
2130 rc = kernel_sock_shutdown(smc->clcsock, how);
2131 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2132 if (sk->sk_shutdown == SHUTDOWN_MASK)
2133 sk->sk_state = SMC_CLOSED;
2134 goto out;
2135 }
2136 switch (how) {
2137 case SHUT_RDWR: /* shutdown in both directions */
2138 rc = smc_close_active(smc);
2139 break;
2140 case SHUT_WR:
2141 rc = smc_close_shutdown_write(smc);
2142 break;
2143 case SHUT_RD:
2144 rc = 0;
2145 /* nothing more to do because peer is not involved */
2146 break;
2147 }
2148 if (smc->clcsock)
2149 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2150 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2151 sk->sk_shutdown |= how + 1;
2152
2153 out:
2154 release_sock(sk);
2155 return rc ? rc : rc1;
2156 }
2157
2158 static int smc_setsockopt(struct socket *sock, int level, int optname,
2159 sockptr_t optval, unsigned int optlen)
2160 {
2161 struct sock *sk = sock->sk;
2162 struct smc_sock *smc;
2163 int val, rc;
2164
2165 smc = smc_sk(sk);
2166
2167 /* generic setsockopts reaching us here always apply to the
2168 * CLC socket
2169 */
2170 if (unlikely(!smc->clcsock->ops->setsockopt))
2171 rc = -EOPNOTSUPP;
2172 else
2173 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2174 optval, optlen);
2175 if (smc->clcsock->sk->sk_err) {
2176 sk->sk_err = smc->clcsock->sk->sk_err;
2177 sk->sk_error_report(sk);
2178 }
2179
2180 if (optlen < sizeof(int))
2181 return -EINVAL;
2182 if (copy_from_sockptr(&val, optval, sizeof(int)))
2183 return -EFAULT;
2184
2185 lock_sock(sk);
2186 if (rc || smc->use_fallback)
2187 goto out;
2188 switch (optname) {
2189 case TCP_ULP:
2190 case TCP_FASTOPEN:
2191 case TCP_FASTOPEN_CONNECT:
2192 case TCP_FASTOPEN_KEY:
2193 case TCP_FASTOPEN_NO_COOKIE:
2194 /* option not supported by SMC */
2195 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2196 smc_switch_to_fallback(smc);
2197 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
2198 } else {
2199 rc = -EINVAL;
2200 }
2201 break;
2202 case TCP_NODELAY:
2203 if (sk->sk_state != SMC_INIT &&
2204 sk->sk_state != SMC_LISTEN &&
2205 sk->sk_state != SMC_CLOSED) {
2206 if (val)
2207 mod_delayed_work(smc->conn.lgr->tx_wq,
2208 &smc->conn.tx_work, 0);
2209 }
2210 break;
2211 case TCP_CORK:
2212 if (sk->sk_state != SMC_INIT &&
2213 sk->sk_state != SMC_LISTEN &&
2214 sk->sk_state != SMC_CLOSED) {
2215 if (!val)
2216 mod_delayed_work(smc->conn.lgr->tx_wq,
2217 &smc->conn.tx_work, 0);
2218 }
2219 break;
2220 case TCP_DEFER_ACCEPT:
2221 smc->sockopt_defer_accept = val;
2222 break;
2223 default:
2224 break;
2225 }
2226 out:
2227 release_sock(sk);
2228
2229 return rc;
2230 }
2231
2232 static int smc_getsockopt(struct socket *sock, int level, int optname,
2233 char __user *optval, int __user *optlen)
2234 {
2235 struct smc_sock *smc;
2236
2237 smc = smc_sk(sock->sk);
2238 /* socket options apply to the CLC socket */
2239 if (unlikely(!smc->clcsock->ops->getsockopt))
2240 return -EOPNOTSUPP;
2241 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2242 optval, optlen);
2243 }
2244
2245 static int smc_ioctl(struct socket *sock, unsigned int cmd,
2246 unsigned long arg)
2247 {
2248 union smc_host_cursor cons, urg;
2249 struct smc_connection *conn;
2250 struct smc_sock *smc;
2251 int answ;
2252
2253 smc = smc_sk(sock->sk);
2254 conn = &smc->conn;
2255 lock_sock(&smc->sk);
2256 if (smc->use_fallback) {
2257 if (!smc->clcsock) {
2258 release_sock(&smc->sk);
2259 return -EBADF;
2260 }
2261 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2262 release_sock(&smc->sk);
2263 return answ;
2264 }
2265 switch (cmd) {
2266 case SIOCINQ: /* same as FIONREAD */
2267 if (smc->sk.sk_state == SMC_LISTEN) {
2268 release_sock(&smc->sk);
2269 return -EINVAL;
2270 }
2271 if (smc->sk.sk_state == SMC_INIT ||
2272 smc->sk.sk_state == SMC_CLOSED)
2273 answ = 0;
2274 else
2275 answ = atomic_read(&smc->conn.bytes_to_rcv);
2276 break;
2277 case SIOCOUTQ:
2278 /* output queue size (not send + not acked) */
2279 if (smc->sk.sk_state == SMC_LISTEN) {
2280 release_sock(&smc->sk);
2281 return -EINVAL;
2282 }
2283 if (smc->sk.sk_state == SMC_INIT ||
2284 smc->sk.sk_state == SMC_CLOSED)
2285 answ = 0;
2286 else
2287 answ = smc->conn.sndbuf_desc->len -
2288 atomic_read(&smc->conn.sndbuf_space);
2289 break;
2290 case SIOCOUTQNSD:
2291 /* output queue size (not send only) */
2292 if (smc->sk.sk_state == SMC_LISTEN) {
2293 release_sock(&smc->sk);
2294 return -EINVAL;
2295 }
2296 if (smc->sk.sk_state == SMC_INIT ||
2297 smc->sk.sk_state == SMC_CLOSED)
2298 answ = 0;
2299 else
2300 answ = smc_tx_prepared_sends(&smc->conn);
2301 break;
2302 case SIOCATMARK:
2303 if (smc->sk.sk_state == SMC_LISTEN) {
2304 release_sock(&smc->sk);
2305 return -EINVAL;
2306 }
2307 if (smc->sk.sk_state == SMC_INIT ||
2308 smc->sk.sk_state == SMC_CLOSED) {
2309 answ = 0;
2310 } else {
2311 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
2312 smc_curs_copy(&urg, &conn->urg_curs, conn);
2313 answ = smc_curs_diff(conn->rmb_desc->len,
2314 &cons, &urg) == 1;
2315 }
2316 break;
2317 default:
2318 release_sock(&smc->sk);
2319 return -ENOIOCTLCMD;
2320 }
2321 release_sock(&smc->sk);
2322
2323 return put_user(answ, (int __user *)arg);
2324 }
2325
2326 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
2327 int offset, size_t size, int flags)
2328 {
2329 struct sock *sk = sock->sk;
2330 struct smc_sock *smc;
2331 int rc = -EPIPE;
2332
2333 smc = smc_sk(sk);
2334 lock_sock(sk);
2335 if (sk->sk_state != SMC_ACTIVE) {
2336 release_sock(sk);
2337 goto out;
2338 }
2339 release_sock(sk);
2340 if (smc->use_fallback)
2341 rc = kernel_sendpage(smc->clcsock, page, offset,
2342 size, flags);
2343 else
2344 rc = sock_no_sendpage(sock, page, offset, size, flags);
2345
2346 out:
2347 return rc;
2348 }
2349
2350 /* Map the affected portions of the rmbe into an spd, note the number of bytes
2351 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
2352 * updates till whenever a respective page has been fully processed.
2353 * Note that subsequent recv() calls have to wait till all splice() processing
2354 * completed.
2355 */
2356 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
2357 struct pipe_inode_info *pipe, size_t len,
2358 unsigned int flags)
2359 {
2360 struct sock *sk = sock->sk;
2361 struct smc_sock *smc;
2362 int rc = -ENOTCONN;
2363
2364 smc = smc_sk(sk);
2365 lock_sock(sk);
2366 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2367 /* socket was connected before, no more data to read */
2368 rc = 0;
2369 goto out;
2370 }
2371 if (sk->sk_state == SMC_INIT ||
2372 sk->sk_state == SMC_LISTEN ||
2373 sk->sk_state == SMC_CLOSED)
2374 goto out;
2375
2376 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2377 rc = 0;
2378 goto out;
2379 }
2380
2381 if (smc->use_fallback) {
2382 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
2383 pipe, len, flags);
2384 } else {
2385 if (*ppos) {
2386 rc = -ESPIPE;
2387 goto out;
2388 }
2389 if (flags & SPLICE_F_NONBLOCK)
2390 flags = MSG_DONTWAIT;
2391 else
2392 flags = 0;
2393 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
2394 }
2395 out:
2396 release_sock(sk);
2397
2398 return rc;
2399 }
2400
2401 /* must look like tcp */
2402 static const struct proto_ops smc_sock_ops = {
2403 .family = PF_SMC,
2404 .owner = THIS_MODULE,
2405 .release = smc_release,
2406 .bind = smc_bind,
2407 .connect = smc_connect,
2408 .socketpair = sock_no_socketpair,
2409 .accept = smc_accept,
2410 .getname = smc_getname,
2411 .poll = smc_poll,
2412 .ioctl = smc_ioctl,
2413 .listen = smc_listen,
2414 .shutdown = smc_shutdown,
2415 .setsockopt = smc_setsockopt,
2416 .getsockopt = smc_getsockopt,
2417 .sendmsg = smc_sendmsg,
2418 .recvmsg = smc_recvmsg,
2419 .mmap = sock_no_mmap,
2420 .sendpage = smc_sendpage,
2421 .splice_read = smc_splice_read,
2422 };
2423
2424 static int smc_create(struct net *net, struct socket *sock, int protocol,
2425 int kern)
2426 {
2427 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
2428 struct smc_sock *smc;
2429 struct sock *sk;
2430 int rc;
2431
2432 rc = -ESOCKTNOSUPPORT;
2433 if (sock->type != SOCK_STREAM)
2434 goto out;
2435
2436 rc = -EPROTONOSUPPORT;
2437 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
2438 goto out;
2439
2440 rc = -ENOBUFS;
2441 sock->ops = &smc_sock_ops;
2442 sk = smc_sock_alloc(net, sock, protocol);
2443 if (!sk)
2444 goto out;
2445
2446 /* create internal TCP socket for CLC handshake and fallback */
2447 smc = smc_sk(sk);
2448 smc->use_fallback = false; /* assume rdma capability first */
2449 smc->fallback_rsn = 0;
2450 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2451 &smc->clcsock);
2452 if (rc) {
2453 sk_common_release(sk);
2454 goto out;
2455 }
2456 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2457 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
2458
2459 out:
2460 return rc;
2461 }
2462
2463 static const struct net_proto_family smc_sock_family_ops = {
2464 .family = PF_SMC,
2465 .owner = THIS_MODULE,
2466 .create = smc_create,
2467 };
2468
2469 unsigned int smc_net_id;
2470
2471 static __net_init int smc_net_init(struct net *net)
2472 {
2473 return smc_pnet_net_init(net);
2474 }
2475
2476 static void __net_exit smc_net_exit(struct net *net)
2477 {
2478 smc_pnet_net_exit(net);
2479 }
2480
2481 static struct pernet_operations smc_net_ops = {
2482 .init = smc_net_init,
2483 .exit = smc_net_exit,
2484 .id = &smc_net_id,
2485 .size = sizeof(struct smc_net),
2486 };
2487
2488 static int __init smc_init(void)
2489 {
2490 int rc;
2491
2492 rc = register_pernet_subsys(&smc_net_ops);
2493 if (rc)
2494 return rc;
2495
2496 smc_ism_init();
2497 smc_clc_init();
2498
2499 rc = smc_nl_init();
2500 if (rc)
2501 goto out_pernet_subsys;
2502
2503 rc = smc_pnet_init();
2504 if (rc)
2505 goto out_nl;
2506
2507 rc = -ENOMEM;
2508 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
2509 if (!smc_hs_wq)
2510 goto out_pnet;
2511
2512 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
2513 if (!smc_close_wq)
2514 goto out_alloc_hs_wq;
2515
2516 rc = smc_core_init();
2517 if (rc) {
2518 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
2519 goto out_alloc_wqs;
2520 }
2521
2522 rc = smc_llc_init();
2523 if (rc) {
2524 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2525 goto out_core;
2526 }
2527
2528 rc = smc_cdc_init();
2529 if (rc) {
2530 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2531 goto out_core;
2532 }
2533
2534 rc = proto_register(&smc_proto, 1);
2535 if (rc) {
2536 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2537 goto out_core;
2538 }
2539
2540 rc = proto_register(&smc_proto6, 1);
2541 if (rc) {
2542 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2543 goto out_proto;
2544 }
2545
2546 rc = sock_register(&smc_sock_family_ops);
2547 if (rc) {
2548 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2549 goto out_proto6;
2550 }
2551 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2552 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2553
2554 rc = smc_ib_register_client();
2555 if (rc) {
2556 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2557 goto out_sock;
2558 }
2559
2560 static_branch_enable(&tcp_have_smc);
2561 return 0;
2562
2563 out_sock:
2564 sock_unregister(PF_SMC);
2565 out_proto6:
2566 proto_unregister(&smc_proto6);
2567 out_proto:
2568 proto_unregister(&smc_proto);
2569 out_core:
2570 smc_core_exit();
2571 out_alloc_wqs:
2572 destroy_workqueue(smc_close_wq);
2573 out_alloc_hs_wq:
2574 destroy_workqueue(smc_hs_wq);
2575 out_pnet:
2576 smc_pnet_exit();
2577 out_nl:
2578 smc_nl_exit();
2579 out_pernet_subsys:
2580 unregister_pernet_subsys(&smc_net_ops);
2581
2582 return rc;
2583 }
2584
2585 static void __exit smc_exit(void)
2586 {
2587 static_branch_disable(&tcp_have_smc);
2588 sock_unregister(PF_SMC);
2589 smc_core_exit();
2590 smc_ib_unregister_client();
2591 destroy_workqueue(smc_close_wq);
2592 destroy_workqueue(smc_hs_wq);
2593 proto_unregister(&smc_proto6);
2594 proto_unregister(&smc_proto);
2595 smc_pnet_exit();
2596 smc_nl_exit();
2597 unregister_pernet_subsys(&smc_net_ops);
2598 rcu_barrier();
2599 }
2600
2601 module_init(smc_init);
2602 module_exit(smc_exit);
2603
2604 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2605 MODULE_DESCRIPTION("smc socket address family");
2606 MODULE_LICENSE("GPL");
2607 MODULE_ALIAS_NETPROTO(PF_SMC);
Linux with added FPC-III support