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 #include <linux/splice.h>
31
32 #include <net/sock.h>
33 #include <net/tcp.h>
34 #include <net/smc.h>
35 #include <asm/ioctls.h>
36
37 #include <net/net_namespace.h>
38 #include <net/netns/generic.h>
39 #include "smc_netns.h"
40
41 #include "smc.h"
42 #include "smc_clc.h"
43 #include "smc_llc.h"
44 #include "smc_cdc.h"
45 #include "smc_core.h"
46 #include "smc_ib.h"
47 #include "smc_ism.h"
48 #include "smc_pnet.h"
49 #include "smc_netlink.h"
50 #include "smc_tx.h"
51 #include "smc_rx.h"
52 #include "smc_close.h"
53 #include "smc_stats.h"
54 #include "smc_tracepoint.h"
55 #include "smc_sysctl.h"
56
57 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
58 * creation on server
59 */
60 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
61 * creation on client
62 */
63
64 static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */
65 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
66 struct workqueue_struct *smc_close_wq; /* wq for close work */
67
68 static void smc_tcp_listen_work(struct work_struct *);
69 static void smc_connect_work(struct work_struct *);
70
smc_nl_dump_hs_limitation(struct sk_buff * skb,struct netlink_callback * cb)71 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
72 {
73 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
74 void *hdr;
75
76 if (cb_ctx->pos[0])
77 goto out;
78
79 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
80 &smc_gen_nl_family, NLM_F_MULTI,
81 SMC_NETLINK_DUMP_HS_LIMITATION);
82 if (!hdr)
83 return -ENOMEM;
84
85 if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
86 sock_net(skb->sk)->smc.limit_smc_hs))
87 goto err;
88
89 genlmsg_end(skb, hdr);
90 cb_ctx->pos[0] = 1;
91 out:
92 return skb->len;
93 err:
94 genlmsg_cancel(skb, hdr);
95 return -EMSGSIZE;
96 }
97
smc_nl_enable_hs_limitation(struct sk_buff * skb,struct genl_info * info)98 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
99 {
100 sock_net(skb->sk)->smc.limit_smc_hs = true;
101 return 0;
102 }
103
smc_nl_disable_hs_limitation(struct sk_buff * skb,struct genl_info * info)104 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
105 {
106 sock_net(skb->sk)->smc.limit_smc_hs = false;
107 return 0;
108 }
109
smc_set_keepalive(struct sock * sk,int val)110 static void smc_set_keepalive(struct sock *sk, int val)
111 {
112 struct smc_sock *smc = smc_sk(sk);
113
114 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
115 }
116
smc_tcp_syn_recv_sock(const struct sock * sk,struct sk_buff * skb,struct request_sock * req,struct dst_entry * dst,struct request_sock * req_unhash,bool * own_req)117 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
118 struct sk_buff *skb,
119 struct request_sock *req,
120 struct dst_entry *dst,
121 struct request_sock *req_unhash,
122 bool *own_req)
123 {
124 struct smc_sock *smc;
125 struct sock *child;
126
127 smc = smc_clcsock_user_data(sk);
128
129 if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
130 sk->sk_max_ack_backlog)
131 goto drop;
132
133 if (sk_acceptq_is_full(&smc->sk)) {
134 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
135 goto drop;
136 }
137
138 /* passthrough to original syn recv sock fct */
139 child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
140 own_req);
141 /* child must not inherit smc or its ops */
142 if (child) {
143 rcu_assign_sk_user_data(child, NULL);
144
145 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
146 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
147 inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
148 }
149 return child;
150
151 drop:
152 dst_release(dst);
153 tcp_listendrop(sk);
154 return NULL;
155 }
156
smc_hs_congested(const struct sock * sk)157 static bool smc_hs_congested(const struct sock *sk)
158 {
159 const struct smc_sock *smc;
160
161 smc = smc_clcsock_user_data(sk);
162
163 if (!smc)
164 return true;
165
166 if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
167 return true;
168
169 return false;
170 }
171
172 static struct smc_hashinfo smc_v4_hashinfo = {
173 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
174 };
175
176 static struct smc_hashinfo smc_v6_hashinfo = {
177 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
178 };
179
smc_hash_sk(struct sock * sk)180 int smc_hash_sk(struct sock *sk)
181 {
182 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
183 struct hlist_head *head;
184
185 head = &h->ht;
186
187 write_lock_bh(&h->lock);
188 sk_add_node(sk, head);
189 write_unlock_bh(&h->lock);
190 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
191
192 return 0;
193 }
194 EXPORT_SYMBOL_GPL(smc_hash_sk);
195
smc_unhash_sk(struct sock * sk)196 void smc_unhash_sk(struct sock *sk)
197 {
198 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
199
200 write_lock_bh(&h->lock);
201 if (sk_del_node_init(sk))
202 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
203 write_unlock_bh(&h->lock);
204 }
205 EXPORT_SYMBOL_GPL(smc_unhash_sk);
206
207 /* This will be called before user really release sock_lock. So do the
208 * work which we didn't do because of user hold the sock_lock in the
209 * BH context
210 */
smc_release_cb(struct sock * sk)211 static void smc_release_cb(struct sock *sk)
212 {
213 struct smc_sock *smc = smc_sk(sk);
214
215 if (smc->conn.tx_in_release_sock) {
216 smc_tx_pending(&smc->conn);
217 smc->conn.tx_in_release_sock = false;
218 }
219 }
220
221 struct proto smc_proto = {
222 .name = "SMC",
223 .owner = THIS_MODULE,
224 .keepalive = smc_set_keepalive,
225 .hash = smc_hash_sk,
226 .unhash = smc_unhash_sk,
227 .release_cb = smc_release_cb,
228 .obj_size = sizeof(struct smc_sock),
229 .h.smc_hash = &smc_v4_hashinfo,
230 .slab_flags = SLAB_TYPESAFE_BY_RCU,
231 };
232 EXPORT_SYMBOL_GPL(smc_proto);
233
234 struct proto smc_proto6 = {
235 .name = "SMC6",
236 .owner = THIS_MODULE,
237 .keepalive = smc_set_keepalive,
238 .hash = smc_hash_sk,
239 .unhash = smc_unhash_sk,
240 .release_cb = smc_release_cb,
241 .obj_size = sizeof(struct smc_sock),
242 .h.smc_hash = &smc_v6_hashinfo,
243 .slab_flags = SLAB_TYPESAFE_BY_RCU,
244 };
245 EXPORT_SYMBOL_GPL(smc_proto6);
246
smc_fback_restore_callbacks(struct smc_sock * smc)247 static void smc_fback_restore_callbacks(struct smc_sock *smc)
248 {
249 struct sock *clcsk = smc->clcsock->sk;
250
251 write_lock_bh(&clcsk->sk_callback_lock);
252 clcsk->sk_user_data = NULL;
253
254 smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
255 smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
256 smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
257 smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
258
259 write_unlock_bh(&clcsk->sk_callback_lock);
260 }
261
smc_restore_fallback_changes(struct smc_sock * smc)262 static void smc_restore_fallback_changes(struct smc_sock *smc)
263 {
264 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
265 smc->clcsock->file->private_data = smc->sk.sk_socket;
266 smc->clcsock->file = NULL;
267 smc_fback_restore_callbacks(smc);
268 }
269 }
270
__smc_release(struct smc_sock * smc)271 static int __smc_release(struct smc_sock *smc)
272 {
273 struct sock *sk = &smc->sk;
274 int rc = 0;
275
276 if (!smc->use_fallback) {
277 rc = smc_close_active(smc);
278 sock_set_flag(sk, SOCK_DEAD);
279 sk->sk_shutdown |= SHUTDOWN_MASK;
280 } else {
281 if (sk->sk_state != SMC_CLOSED) {
282 if (sk->sk_state != SMC_LISTEN &&
283 sk->sk_state != SMC_INIT)
284 sock_put(sk); /* passive closing */
285 if (sk->sk_state == SMC_LISTEN) {
286 /* wake up clcsock accept */
287 rc = kernel_sock_shutdown(smc->clcsock,
288 SHUT_RDWR);
289 }
290 sk->sk_state = SMC_CLOSED;
291 sk->sk_state_change(sk);
292 }
293 smc_restore_fallback_changes(smc);
294 }
295
296 sk->sk_prot->unhash(sk);
297
298 if (sk->sk_state == SMC_CLOSED) {
299 if (smc->clcsock) {
300 release_sock(sk);
301 smc_clcsock_release(smc);
302 lock_sock(sk);
303 }
304 if (!smc->use_fallback)
305 smc_conn_free(&smc->conn);
306 }
307
308 return rc;
309 }
310
smc_release(struct socket * sock)311 static int smc_release(struct socket *sock)
312 {
313 struct sock *sk = sock->sk;
314 struct smc_sock *smc;
315 int old_state, rc = 0;
316
317 if (!sk)
318 goto out;
319
320 sock_hold(sk); /* sock_put below */
321 smc = smc_sk(sk);
322
323 old_state = sk->sk_state;
324
325 /* cleanup for a dangling non-blocking connect */
326 if (smc->connect_nonblock && old_state == SMC_INIT)
327 tcp_abort(smc->clcsock->sk, ECONNABORTED);
328
329 if (cancel_work_sync(&smc->connect_work))
330 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
331
332 if (sk->sk_state == SMC_LISTEN)
333 /* smc_close_non_accepted() is called and acquires
334 * sock lock for child sockets again
335 */
336 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
337 else
338 lock_sock(sk);
339
340 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
341 !smc->use_fallback)
342 smc_close_active_abort(smc);
343
344 rc = __smc_release(smc);
345
346 /* detach socket */
347 sock_orphan(sk);
348 sock->sk = NULL;
349 release_sock(sk);
350
351 sock_put(sk); /* sock_hold above */
352 sock_put(sk); /* final sock_put */
353 out:
354 return rc;
355 }
356
smc_destruct(struct sock * sk)357 static void smc_destruct(struct sock *sk)
358 {
359 if (sk->sk_state != SMC_CLOSED)
360 return;
361 if (!sock_flag(sk, SOCK_DEAD))
362 return;
363 }
364
smc_sock_alloc(struct net * net,struct socket * sock,int protocol)365 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
366 int protocol)
367 {
368 struct smc_sock *smc;
369 struct proto *prot;
370 struct sock *sk;
371
372 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
373 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
374 if (!sk)
375 return NULL;
376
377 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
378 sk->sk_state = SMC_INIT;
379 sk->sk_destruct = smc_destruct;
380 sk->sk_protocol = protocol;
381 WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
382 WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
383 smc = smc_sk(sk);
384 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
385 INIT_WORK(&smc->connect_work, smc_connect_work);
386 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
387 INIT_LIST_HEAD(&smc->accept_q);
388 spin_lock_init(&smc->accept_q_lock);
389 spin_lock_init(&smc->conn.send_lock);
390 sk->sk_prot->hash(sk);
391 mutex_init(&smc->clcsock_release_lock);
392 smc_init_saved_callbacks(smc);
393
394 return sk;
395 }
396
smc_bind(struct socket * sock,struct sockaddr * uaddr,int addr_len)397 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
398 int addr_len)
399 {
400 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
401 struct sock *sk = sock->sk;
402 struct smc_sock *smc;
403 int rc;
404
405 smc = smc_sk(sk);
406
407 /* replicate tests from inet_bind(), to be safe wrt. future changes */
408 rc = -EINVAL;
409 if (addr_len < sizeof(struct sockaddr_in))
410 goto out;
411
412 rc = -EAFNOSUPPORT;
413 if (addr->sin_family != AF_INET &&
414 addr->sin_family != AF_INET6 &&
415 addr->sin_family != AF_UNSPEC)
416 goto out;
417 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
418 if (addr->sin_family == AF_UNSPEC &&
419 addr->sin_addr.s_addr != htonl(INADDR_ANY))
420 goto out;
421
422 lock_sock(sk);
423
424 /* Check if socket is already active */
425 rc = -EINVAL;
426 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
427 goto out_rel;
428
429 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
430 smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
431 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
432
433 out_rel:
434 release_sock(sk);
435 out:
436 return rc;
437 }
438
439 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
440 * clc socket (since smc is not called for these options from net/core)
441 */
442
443 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
444 (1UL << SOCK_KEEPOPEN) | \
445 (1UL << SOCK_LINGER) | \
446 (1UL << SOCK_BROADCAST) | \
447 (1UL << SOCK_TIMESTAMP) | \
448 (1UL << SOCK_DBG) | \
449 (1UL << SOCK_RCVTSTAMP) | \
450 (1UL << SOCK_RCVTSTAMPNS) | \
451 (1UL << SOCK_LOCALROUTE) | \
452 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
453 (1UL << SOCK_RXQ_OVFL) | \
454 (1UL << SOCK_WIFI_STATUS) | \
455 (1UL << SOCK_NOFCS) | \
456 (1UL << SOCK_FILTER_LOCKED) | \
457 (1UL << SOCK_TSTAMP_NEW))
458
459 /* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */
smc_adjust_sock_bufsizes(struct sock * nsk,struct sock * osk,unsigned long mask)460 static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk,
461 unsigned long mask)
462 {
463 struct net *nnet = sock_net(nsk);
464
465 nsk->sk_userlocks = osk->sk_userlocks;
466 if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) {
467 nsk->sk_sndbuf = osk->sk_sndbuf;
468 } else {
469 if (mask == SK_FLAGS_SMC_TO_CLC)
470 WRITE_ONCE(nsk->sk_sndbuf,
471 READ_ONCE(nnet->ipv4.sysctl_tcp_wmem[1]));
472 else
473 WRITE_ONCE(nsk->sk_sndbuf,
474 2 * READ_ONCE(nnet->smc.sysctl_wmem));
475 }
476 if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) {
477 nsk->sk_rcvbuf = osk->sk_rcvbuf;
478 } else {
479 if (mask == SK_FLAGS_SMC_TO_CLC)
480 WRITE_ONCE(nsk->sk_rcvbuf,
481 READ_ONCE(nnet->ipv4.sysctl_tcp_rmem[1]));
482 else
483 WRITE_ONCE(nsk->sk_rcvbuf,
484 2 * READ_ONCE(nnet->smc.sysctl_rmem));
485 }
486 }
487
smc_copy_sock_settings(struct sock * nsk,struct sock * osk,unsigned long mask)488 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
489 unsigned long mask)
490 {
491 /* options we don't get control via setsockopt for */
492 nsk->sk_type = osk->sk_type;
493 nsk->sk_sndtimeo = osk->sk_sndtimeo;
494 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
495 nsk->sk_mark = READ_ONCE(osk->sk_mark);
496 nsk->sk_priority = osk->sk_priority;
497 nsk->sk_rcvlowat = osk->sk_rcvlowat;
498 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
499 nsk->sk_err = osk->sk_err;
500
501 nsk->sk_flags &= ~mask;
502 nsk->sk_flags |= osk->sk_flags & mask;
503
504 smc_adjust_sock_bufsizes(nsk, osk, mask);
505 }
506
smc_copy_sock_settings_to_clc(struct smc_sock * smc)507 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
508 {
509 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
510 }
511
512 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
513 (1UL << SOCK_KEEPOPEN) | \
514 (1UL << SOCK_LINGER) | \
515 (1UL << SOCK_DBG))
516 /* copy only settings and flags relevant for smc from clc to smc socket */
smc_copy_sock_settings_to_smc(struct smc_sock * smc)517 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
518 {
519 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
520 }
521
522 /* register the new vzalloced sndbuf on all links */
smcr_lgr_reg_sndbufs(struct smc_link * link,struct smc_buf_desc * snd_desc)523 static int smcr_lgr_reg_sndbufs(struct smc_link *link,
524 struct smc_buf_desc *snd_desc)
525 {
526 struct smc_link_group *lgr = link->lgr;
527 int i, rc = 0;
528
529 if (!snd_desc->is_vm)
530 return -EINVAL;
531
532 /* protect against parallel smcr_link_reg_buf() */
533 down_write(&lgr->llc_conf_mutex);
534 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
535 if (!smc_link_active(&lgr->lnk[i]))
536 continue;
537 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
538 if (rc)
539 break;
540 }
541 up_write(&lgr->llc_conf_mutex);
542 return rc;
543 }
544
545 /* register the new rmb on all links */
smcr_lgr_reg_rmbs(struct smc_link * link,struct smc_buf_desc * rmb_desc)546 static int smcr_lgr_reg_rmbs(struct smc_link *link,
547 struct smc_buf_desc *rmb_desc)
548 {
549 struct smc_link_group *lgr = link->lgr;
550 bool do_slow = false;
551 int i, rc = 0;
552
553 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
554 if (rc)
555 return rc;
556
557 down_read(&lgr->llc_conf_mutex);
558 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
559 if (!smc_link_active(&lgr->lnk[i]))
560 continue;
561 if (!rmb_desc->is_reg_mr[link->link_idx]) {
562 up_read(&lgr->llc_conf_mutex);
563 goto slow_path;
564 }
565 }
566 /* mr register already */
567 goto fast_path;
568 slow_path:
569 do_slow = true;
570 /* protect against parallel smc_llc_cli_rkey_exchange() and
571 * parallel smcr_link_reg_buf()
572 */
573 down_write(&lgr->llc_conf_mutex);
574 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
575 if (!smc_link_active(&lgr->lnk[i]))
576 continue;
577 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
578 if (rc)
579 goto out;
580 }
581 fast_path:
582 /* exchange confirm_rkey msg with peer */
583 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
584 if (rc) {
585 rc = -EFAULT;
586 goto out;
587 }
588 rmb_desc->is_conf_rkey = true;
589 out:
590 do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
591 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
592 return rc;
593 }
594
smcr_clnt_conf_first_link(struct smc_sock * smc)595 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
596 {
597 struct smc_link *link = smc->conn.lnk;
598 struct smc_llc_qentry *qentry;
599 int rc;
600
601 /* receive CONFIRM LINK request from server over RoCE fabric */
602 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
603 SMC_LLC_CONFIRM_LINK);
604 if (!qentry) {
605 struct smc_clc_msg_decline dclc;
606
607 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
608 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
609 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
610 }
611 smc_llc_save_peer_uid(qentry);
612 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
613 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
614 if (rc)
615 return SMC_CLC_DECL_RMBE_EC;
616
617 rc = smc_ib_modify_qp_rts(link);
618 if (rc)
619 return SMC_CLC_DECL_ERR_RDYLNK;
620
621 smc_wr_remember_qp_attr(link);
622
623 /* reg the sndbuf if it was vzalloced */
624 if (smc->conn.sndbuf_desc->is_vm) {
625 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
626 return SMC_CLC_DECL_ERR_REGBUF;
627 }
628
629 /* reg the rmb */
630 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
631 return SMC_CLC_DECL_ERR_REGBUF;
632
633 /* confirm_rkey is implicit on 1st contact */
634 smc->conn.rmb_desc->is_conf_rkey = true;
635
636 /* send CONFIRM LINK response over RoCE fabric */
637 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
638 if (rc < 0)
639 return SMC_CLC_DECL_TIMEOUT_CL;
640
641 smc_llc_link_active(link);
642 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
643
644 if (link->lgr->max_links > 1) {
645 /* optional 2nd link, receive ADD LINK request from server */
646 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
647 SMC_LLC_ADD_LINK);
648 if (!qentry) {
649 struct smc_clc_msg_decline dclc;
650
651 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
652 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
653 if (rc == -EAGAIN)
654 rc = 0; /* no DECLINE received, go with one link */
655 return rc;
656 }
657 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
658 smc_llc_cli_add_link(link, qentry);
659 }
660 return 0;
661 }
662
smc_isascii(char * hostname)663 static bool smc_isascii(char *hostname)
664 {
665 int i;
666
667 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
668 if (!isascii(hostname[i]))
669 return false;
670 return true;
671 }
672
smc_conn_save_peer_info_fce(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)673 static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
674 struct smc_clc_msg_accept_confirm *clc)
675 {
676 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
677 (struct smc_clc_msg_accept_confirm_v2 *)clc;
678 struct smc_clc_first_contact_ext *fce;
679 int clc_v2_len;
680
681 if (clc->hdr.version == SMC_V1 ||
682 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
683 return;
684
685 if (smc->conn.lgr->is_smcd) {
686 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
687 SMC_MAX_EID_LEN);
688 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
689 d1);
690 } else {
691 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
692 SMC_MAX_EID_LEN);
693 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
694 r1);
695 }
696 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
697 smc->conn.lgr->peer_os = fce->os_type;
698 smc->conn.lgr->peer_smc_release = fce->release;
699 if (smc_isascii(fce->hostname))
700 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
701 SMC_MAX_HOSTNAME_LEN);
702 }
703
smcr_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)704 static void smcr_conn_save_peer_info(struct smc_sock *smc,
705 struct smc_clc_msg_accept_confirm *clc)
706 {
707 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
708
709 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
710 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
711 smc->conn.peer_rmbe_size = bufsize;
712 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
713 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
714 }
715
smcd_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)716 static void smcd_conn_save_peer_info(struct smc_sock *smc,
717 struct smc_clc_msg_accept_confirm *clc)
718 {
719 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
720
721 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
722 smc->conn.peer_token = clc->d0.token;
723 /* msg header takes up space in the buffer */
724 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
725 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
726 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
727 }
728
smc_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)729 static void smc_conn_save_peer_info(struct smc_sock *smc,
730 struct smc_clc_msg_accept_confirm *clc)
731 {
732 if (smc->conn.lgr->is_smcd)
733 smcd_conn_save_peer_info(smc, clc);
734 else
735 smcr_conn_save_peer_info(smc, clc);
736 smc_conn_save_peer_info_fce(smc, clc);
737 }
738
smc_link_save_peer_info(struct smc_link * link,struct smc_clc_msg_accept_confirm * clc,struct smc_init_info * ini)739 static void smc_link_save_peer_info(struct smc_link *link,
740 struct smc_clc_msg_accept_confirm *clc,
741 struct smc_init_info *ini)
742 {
743 link->peer_qpn = ntoh24(clc->r0.qpn);
744 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
745 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
746 link->peer_psn = ntoh24(clc->r0.psn);
747 link->peer_mtu = clc->r0.qp_mtu;
748 }
749
smc_stat_inc_fback_rsn_cnt(struct smc_sock * smc,struct smc_stats_fback * fback_arr)750 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
751 struct smc_stats_fback *fback_arr)
752 {
753 int cnt;
754
755 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
756 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
757 fback_arr[cnt].count++;
758 break;
759 }
760 if (!fback_arr[cnt].fback_code) {
761 fback_arr[cnt].fback_code = smc->fallback_rsn;
762 fback_arr[cnt].count++;
763 break;
764 }
765 }
766 }
767
smc_stat_fallback(struct smc_sock * smc)768 static void smc_stat_fallback(struct smc_sock *smc)
769 {
770 struct net *net = sock_net(&smc->sk);
771
772 mutex_lock(&net->smc.mutex_fback_rsn);
773 if (smc->listen_smc) {
774 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
775 net->smc.fback_rsn->srv_fback_cnt++;
776 } else {
777 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
778 net->smc.fback_rsn->clnt_fback_cnt++;
779 }
780 mutex_unlock(&net->smc.mutex_fback_rsn);
781 }
782
783 /* must be called under rcu read lock */
smc_fback_wakeup_waitqueue(struct smc_sock * smc,void * key)784 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
785 {
786 struct socket_wq *wq;
787 __poll_t flags;
788
789 wq = rcu_dereference(smc->sk.sk_wq);
790 if (!skwq_has_sleeper(wq))
791 return;
792
793 /* wake up smc sk->sk_wq */
794 if (!key) {
795 /* sk_state_change */
796 wake_up_interruptible_all(&wq->wait);
797 } else {
798 flags = key_to_poll(key);
799 if (flags & (EPOLLIN | EPOLLOUT))
800 /* sk_data_ready or sk_write_space */
801 wake_up_interruptible_sync_poll(&wq->wait, flags);
802 else if (flags & EPOLLERR)
803 /* sk_error_report */
804 wake_up_interruptible_poll(&wq->wait, flags);
805 }
806 }
807
smc_fback_mark_woken(wait_queue_entry_t * wait,unsigned int mode,int sync,void * key)808 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
809 unsigned int mode, int sync, void *key)
810 {
811 struct smc_mark_woken *mark =
812 container_of(wait, struct smc_mark_woken, wait_entry);
813
814 mark->woken = true;
815 mark->key = key;
816 return 0;
817 }
818
smc_fback_forward_wakeup(struct smc_sock * smc,struct sock * clcsk,void (* clcsock_callback)(struct sock * sk))819 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
820 void (*clcsock_callback)(struct sock *sk))
821 {
822 struct smc_mark_woken mark = { .woken = false };
823 struct socket_wq *wq;
824
825 init_waitqueue_func_entry(&mark.wait_entry,
826 smc_fback_mark_woken);
827 rcu_read_lock();
828 wq = rcu_dereference(clcsk->sk_wq);
829 if (!wq)
830 goto out;
831 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
832 clcsock_callback(clcsk);
833 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
834
835 if (mark.woken)
836 smc_fback_wakeup_waitqueue(smc, mark.key);
837 out:
838 rcu_read_unlock();
839 }
840
smc_fback_state_change(struct sock * clcsk)841 static void smc_fback_state_change(struct sock *clcsk)
842 {
843 struct smc_sock *smc;
844
845 read_lock_bh(&clcsk->sk_callback_lock);
846 smc = smc_clcsock_user_data(clcsk);
847 if (smc)
848 smc_fback_forward_wakeup(smc, clcsk,
849 smc->clcsk_state_change);
850 read_unlock_bh(&clcsk->sk_callback_lock);
851 }
852
smc_fback_data_ready(struct sock * clcsk)853 static void smc_fback_data_ready(struct sock *clcsk)
854 {
855 struct smc_sock *smc;
856
857 read_lock_bh(&clcsk->sk_callback_lock);
858 smc = smc_clcsock_user_data(clcsk);
859 if (smc)
860 smc_fback_forward_wakeup(smc, clcsk,
861 smc->clcsk_data_ready);
862 read_unlock_bh(&clcsk->sk_callback_lock);
863 }
864
smc_fback_write_space(struct sock * clcsk)865 static void smc_fback_write_space(struct sock *clcsk)
866 {
867 struct smc_sock *smc;
868
869 read_lock_bh(&clcsk->sk_callback_lock);
870 smc = smc_clcsock_user_data(clcsk);
871 if (smc)
872 smc_fback_forward_wakeup(smc, clcsk,
873 smc->clcsk_write_space);
874 read_unlock_bh(&clcsk->sk_callback_lock);
875 }
876
smc_fback_error_report(struct sock * clcsk)877 static void smc_fback_error_report(struct sock *clcsk)
878 {
879 struct smc_sock *smc;
880
881 read_lock_bh(&clcsk->sk_callback_lock);
882 smc = smc_clcsock_user_data(clcsk);
883 if (smc)
884 smc_fback_forward_wakeup(smc, clcsk,
885 smc->clcsk_error_report);
886 read_unlock_bh(&clcsk->sk_callback_lock);
887 }
888
smc_fback_replace_callbacks(struct smc_sock * smc)889 static void smc_fback_replace_callbacks(struct smc_sock *smc)
890 {
891 struct sock *clcsk = smc->clcsock->sk;
892
893 write_lock_bh(&clcsk->sk_callback_lock);
894 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
895
896 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
897 &smc->clcsk_state_change);
898 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
899 &smc->clcsk_data_ready);
900 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
901 &smc->clcsk_write_space);
902 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
903 &smc->clcsk_error_report);
904
905 write_unlock_bh(&clcsk->sk_callback_lock);
906 }
907
smc_switch_to_fallback(struct smc_sock * smc,int reason_code)908 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
909 {
910 int rc = 0;
911
912 mutex_lock(&smc->clcsock_release_lock);
913 if (!smc->clcsock) {
914 rc = -EBADF;
915 goto out;
916 }
917
918 smc->use_fallback = true;
919 smc->fallback_rsn = reason_code;
920 smc_stat_fallback(smc);
921 trace_smc_switch_to_fallback(smc, reason_code);
922 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
923 smc->clcsock->file = smc->sk.sk_socket->file;
924 smc->clcsock->file->private_data = smc->clcsock;
925 smc->clcsock->wq.fasync_list =
926 smc->sk.sk_socket->wq.fasync_list;
927
928 /* There might be some wait entries remaining
929 * in smc sk->sk_wq and they should be woken up
930 * as clcsock's wait queue is woken up.
931 */
932 smc_fback_replace_callbacks(smc);
933 }
934 out:
935 mutex_unlock(&smc->clcsock_release_lock);
936 return rc;
937 }
938
939 /* fall back during connect */
smc_connect_fallback(struct smc_sock * smc,int reason_code)940 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
941 {
942 struct net *net = sock_net(&smc->sk);
943 int rc = 0;
944
945 rc = smc_switch_to_fallback(smc, reason_code);
946 if (rc) { /* fallback fails */
947 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
948 if (smc->sk.sk_state == SMC_INIT)
949 sock_put(&smc->sk); /* passive closing */
950 return rc;
951 }
952 smc_copy_sock_settings_to_clc(smc);
953 smc->connect_nonblock = 0;
954 if (smc->sk.sk_state == SMC_INIT)
955 smc->sk.sk_state = SMC_ACTIVE;
956 return 0;
957 }
958
959 /* decline and fall back during connect */
smc_connect_decline_fallback(struct smc_sock * smc,int reason_code,u8 version)960 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
961 u8 version)
962 {
963 struct net *net = sock_net(&smc->sk);
964 int rc;
965
966 if (reason_code < 0) { /* error, fallback is not possible */
967 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
968 if (smc->sk.sk_state == SMC_INIT)
969 sock_put(&smc->sk); /* passive closing */
970 return reason_code;
971 }
972 if (reason_code != SMC_CLC_DECL_PEERDECL) {
973 rc = smc_clc_send_decline(smc, reason_code, version);
974 if (rc < 0) {
975 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
976 if (smc->sk.sk_state == SMC_INIT)
977 sock_put(&smc->sk); /* passive closing */
978 return rc;
979 }
980 }
981 return smc_connect_fallback(smc, reason_code);
982 }
983
smc_conn_abort(struct smc_sock * smc,int local_first)984 static void smc_conn_abort(struct smc_sock *smc, int local_first)
985 {
986 struct smc_connection *conn = &smc->conn;
987 struct smc_link_group *lgr = conn->lgr;
988 bool lgr_valid = false;
989
990 if (smc_conn_lgr_valid(conn))
991 lgr_valid = true;
992
993 smc_conn_free(conn);
994 if (local_first && lgr_valid)
995 smc_lgr_cleanup_early(lgr);
996 }
997
998 /* check if there is a rdma device available for this connection. */
999 /* called for connect and listen */
smc_find_rdma_device(struct smc_sock * smc,struct smc_init_info * ini)1000 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
1001 {
1002 /* PNET table look up: search active ib_device and port
1003 * within same PNETID that also contains the ethernet device
1004 * used for the internal TCP socket
1005 */
1006 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
1007 if (!ini->check_smcrv2 && !ini->ib_dev)
1008 return SMC_CLC_DECL_NOSMCRDEV;
1009 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
1010 return SMC_CLC_DECL_NOSMCRDEV;
1011 return 0;
1012 }
1013
1014 /* check if there is an ISM device available for this connection. */
1015 /* called for connect and listen */
smc_find_ism_device(struct smc_sock * smc,struct smc_init_info * ini)1016 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
1017 {
1018 /* Find ISM device with same PNETID as connecting interface */
1019 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
1020 if (!ini->ism_dev[0])
1021 return SMC_CLC_DECL_NOSMCDDEV;
1022 else
1023 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
1024 return 0;
1025 }
1026
1027 /* is chid unique for the ism devices that are already determined? */
smc_find_ism_v2_is_unique_chid(u16 chid,struct smc_init_info * ini,int cnt)1028 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1029 int cnt)
1030 {
1031 int i = (!ini->ism_dev[0]) ? 1 : 0;
1032
1033 for (; i < cnt; i++)
1034 if (ini->ism_chid[i] == chid)
1035 return false;
1036 return true;
1037 }
1038
1039 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1040 * PNETID matching net_device)
1041 */
smc_find_ism_v2_device_clnt(struct smc_sock * smc,struct smc_init_info * ini)1042 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1043 struct smc_init_info *ini)
1044 {
1045 int rc = SMC_CLC_DECL_NOSMCDDEV;
1046 struct smcd_dev *smcd;
1047 int i = 1;
1048 u16 chid;
1049
1050 if (smcd_indicated(ini->smc_type_v1))
1051 rc = 0; /* already initialized for V1 */
1052 mutex_lock(&smcd_dev_list.mutex);
1053 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1054 if (smcd->going_away || smcd == ini->ism_dev[0])
1055 continue;
1056 chid = smc_ism_get_chid(smcd);
1057 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1058 continue;
1059 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1060 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1061 ini->ism_dev[i] = smcd;
1062 ini->ism_chid[i] = chid;
1063 ini->is_smcd = true;
1064 rc = 0;
1065 i++;
1066 if (i > SMC_MAX_ISM_DEVS)
1067 break;
1068 }
1069 }
1070 mutex_unlock(&smcd_dev_list.mutex);
1071 ini->ism_offered_cnt = i - 1;
1072 if (!ini->ism_dev[0] && !ini->ism_dev[1])
1073 ini->smcd_version = 0;
1074
1075 return rc;
1076 }
1077
1078 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
smc_connect_ism_vlan_setup(struct smc_sock * smc,struct smc_init_info * ini)1079 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1080 struct smc_init_info *ini)
1081 {
1082 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1083 return SMC_CLC_DECL_ISMVLANERR;
1084 return 0;
1085 }
1086
smc_find_proposal_devices(struct smc_sock * smc,struct smc_init_info * ini)1087 static int smc_find_proposal_devices(struct smc_sock *smc,
1088 struct smc_init_info *ini)
1089 {
1090 int rc = 0;
1091
1092 /* check if there is an ism device available */
1093 if (!(ini->smcd_version & SMC_V1) ||
1094 smc_find_ism_device(smc, ini) ||
1095 smc_connect_ism_vlan_setup(smc, ini))
1096 ini->smcd_version &= ~SMC_V1;
1097 /* else ISM V1 is supported for this connection */
1098
1099 /* check if there is an rdma device available */
1100 if (!(ini->smcr_version & SMC_V1) ||
1101 smc_find_rdma_device(smc, ini))
1102 ini->smcr_version &= ~SMC_V1;
1103 /* else RDMA is supported for this connection */
1104
1105 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1106 ini->smcr_version & SMC_V1);
1107
1108 /* check if there is an ism v2 device available */
1109 if (!(ini->smcd_version & SMC_V2) ||
1110 !smc_ism_is_v2_capable() ||
1111 smc_find_ism_v2_device_clnt(smc, ini))
1112 ini->smcd_version &= ~SMC_V2;
1113
1114 /* check if there is an rdma v2 device available */
1115 ini->check_smcrv2 = true;
1116 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1117 if (!(ini->smcr_version & SMC_V2) ||
1118 smc->clcsock->sk->sk_family != AF_INET ||
1119 !smc_clc_ueid_count() ||
1120 smc_find_rdma_device(smc, ini))
1121 ini->smcr_version &= ~SMC_V2;
1122 ini->check_smcrv2 = false;
1123
1124 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1125 ini->smcr_version & SMC_V2);
1126
1127 /* if neither ISM nor RDMA are supported, fallback */
1128 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1129 rc = SMC_CLC_DECL_NOSMCDEV;
1130
1131 return rc;
1132 }
1133
1134 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1135 * used, the VLAN ID will be registered again during the connection setup.
1136 */
smc_connect_ism_vlan_cleanup(struct smc_sock * smc,struct smc_init_info * ini)1137 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1138 struct smc_init_info *ini)
1139 {
1140 if (!smcd_indicated(ini->smc_type_v1))
1141 return 0;
1142 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1143 return SMC_CLC_DECL_CNFERR;
1144 return 0;
1145 }
1146
1147 #define SMC_CLC_MAX_ACCEPT_LEN \
1148 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
1149 sizeof(struct smc_clc_first_contact_ext_v2x) + \
1150 sizeof(struct smc_clc_msg_trail))
1151
1152 /* CLC handshake during connect */
smc_connect_clc(struct smc_sock * smc,struct smc_clc_msg_accept_confirm_v2 * aclc2,struct smc_init_info * ini)1153 static int smc_connect_clc(struct smc_sock *smc,
1154 struct smc_clc_msg_accept_confirm_v2 *aclc2,
1155 struct smc_init_info *ini)
1156 {
1157 int rc = 0;
1158
1159 /* do inband token exchange */
1160 rc = smc_clc_send_proposal(smc, ini);
1161 if (rc)
1162 return rc;
1163 /* receive SMC Accept CLC message */
1164 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
1165 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1166 }
1167
smc_fill_gid_list(struct smc_link_group * lgr,struct smc_gidlist * gidlist,struct smc_ib_device * known_dev,u8 * known_gid)1168 void smc_fill_gid_list(struct smc_link_group *lgr,
1169 struct smc_gidlist *gidlist,
1170 struct smc_ib_device *known_dev, u8 *known_gid)
1171 {
1172 struct smc_init_info *alt_ini = NULL;
1173
1174 memset(gidlist, 0, sizeof(*gidlist));
1175 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1176
1177 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1178 if (!alt_ini)
1179 goto out;
1180
1181 alt_ini->vlan_id = lgr->vlan_id;
1182 alt_ini->check_smcrv2 = true;
1183 alt_ini->smcrv2.saddr = lgr->saddr;
1184 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1185
1186 if (!alt_ini->smcrv2.ib_dev_v2)
1187 goto out;
1188
1189 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1190 SMC_GID_SIZE);
1191
1192 out:
1193 kfree(alt_ini);
1194 }
1195
smc_connect_rdma_v2_prepare(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * aclc,struct smc_init_info * ini)1196 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1197 struct smc_clc_msg_accept_confirm *aclc,
1198 struct smc_init_info *ini)
1199 {
1200 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1201 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1202 struct smc_clc_first_contact_ext *fce =
1203 smc_get_clc_first_contact_ext(clc_v2, false);
1204 struct net *net = sock_net(&smc->sk);
1205 int rc;
1206
1207 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1208 return 0;
1209
1210 if (fce->v2_direct) {
1211 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1212 ini->smcrv2.uses_gateway = false;
1213 } else {
1214 if (smc_ib_find_route(net, smc->clcsock->sk->sk_rcv_saddr,
1215 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1216 ini->smcrv2.nexthop_mac,
1217 &ini->smcrv2.uses_gateway))
1218 return SMC_CLC_DECL_NOROUTE;
1219 if (!ini->smcrv2.uses_gateway) {
1220 /* mismatch: peer claims indirect, but its direct */
1221 return SMC_CLC_DECL_NOINDIRECT;
1222 }
1223 }
1224
1225 ini->release_nr = fce->release;
1226 rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1227 if (rc)
1228 return rc;
1229
1230 return 0;
1231 }
1232
1233 /* setup for RDMA connection of client */
smc_connect_rdma(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * aclc,struct smc_init_info * ini)1234 static int smc_connect_rdma(struct smc_sock *smc,
1235 struct smc_clc_msg_accept_confirm *aclc,
1236 struct smc_init_info *ini)
1237 {
1238 int i, reason_code = 0;
1239 struct smc_link *link;
1240 u8 *eid = NULL;
1241
1242 ini->is_smcd = false;
1243 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1244 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1245 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1246 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1247 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1248 ini->max_conns = SMC_CONN_PER_LGR_MAX;
1249 ini->max_links = SMC_LINKS_ADD_LNK_MAX;
1250
1251 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1252 if (reason_code)
1253 return reason_code;
1254
1255 mutex_lock(&smc_client_lgr_pending);
1256 reason_code = smc_conn_create(smc, ini);
1257 if (reason_code) {
1258 mutex_unlock(&smc_client_lgr_pending);
1259 return reason_code;
1260 }
1261
1262 smc_conn_save_peer_info(smc, aclc);
1263
1264 if (ini->first_contact_local) {
1265 link = smc->conn.lnk;
1266 } else {
1267 /* set link that was assigned by server */
1268 link = NULL;
1269 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1270 struct smc_link *l = &smc->conn.lgr->lnk[i];
1271
1272 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1273 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1274 SMC_GID_SIZE) &&
1275 (aclc->hdr.version > SMC_V1 ||
1276 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1277 sizeof(l->peer_mac)))) {
1278 link = l;
1279 break;
1280 }
1281 }
1282 if (!link) {
1283 reason_code = SMC_CLC_DECL_NOSRVLINK;
1284 goto connect_abort;
1285 }
1286 smc_switch_link_and_count(&smc->conn, link);
1287 }
1288
1289 /* create send buffer and rmb */
1290 if (smc_buf_create(smc, false)) {
1291 reason_code = SMC_CLC_DECL_MEM;
1292 goto connect_abort;
1293 }
1294
1295 if (ini->first_contact_local)
1296 smc_link_save_peer_info(link, aclc, ini);
1297
1298 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1299 reason_code = SMC_CLC_DECL_ERR_RTOK;
1300 goto connect_abort;
1301 }
1302
1303 smc_close_init(smc);
1304 smc_rx_init(smc);
1305
1306 if (ini->first_contact_local) {
1307 if (smc_ib_ready_link(link)) {
1308 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1309 goto connect_abort;
1310 }
1311 } else {
1312 /* reg sendbufs if they were vzalloced */
1313 if (smc->conn.sndbuf_desc->is_vm) {
1314 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1315 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1316 goto connect_abort;
1317 }
1318 }
1319 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1320 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1321 goto connect_abort;
1322 }
1323 }
1324
1325 if (aclc->hdr.version > SMC_V1) {
1326 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1327 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1328
1329 eid = clc_v2->r1.eid;
1330 if (ini->first_contact_local)
1331 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1332 link->smcibdev, link->gid);
1333 }
1334
1335 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1336 aclc->hdr.version, eid, ini);
1337 if (reason_code)
1338 goto connect_abort;
1339
1340 smc_tx_init(smc);
1341
1342 if (ini->first_contact_local) {
1343 /* QP confirmation over RoCE fabric */
1344 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1345 reason_code = smcr_clnt_conf_first_link(smc);
1346 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1347 if (reason_code)
1348 goto connect_abort;
1349 }
1350 mutex_unlock(&smc_client_lgr_pending);
1351
1352 smc_copy_sock_settings_to_clc(smc);
1353 smc->connect_nonblock = 0;
1354 if (smc->sk.sk_state == SMC_INIT)
1355 smc->sk.sk_state = SMC_ACTIVE;
1356
1357 return 0;
1358 connect_abort:
1359 smc_conn_abort(smc, ini->first_contact_local);
1360 mutex_unlock(&smc_client_lgr_pending);
1361 smc->connect_nonblock = 0;
1362
1363 return reason_code;
1364 }
1365
1366 /* The server has chosen one of the proposed ISM devices for the communication.
1367 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1368 */
1369 static int
smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 * aclc,struct smc_init_info * ini)1370 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1371 struct smc_init_info *ini)
1372 {
1373 int i;
1374
1375 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1376 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1377 ini->ism_selected = i;
1378 return 0;
1379 }
1380 }
1381
1382 return -EPROTO;
1383 }
1384
1385 /* setup for ISM connection of client */
smc_connect_ism(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * aclc,struct smc_init_info * ini)1386 static int smc_connect_ism(struct smc_sock *smc,
1387 struct smc_clc_msg_accept_confirm *aclc,
1388 struct smc_init_info *ini)
1389 {
1390 u8 *eid = NULL;
1391 int rc = 0;
1392
1393 ini->is_smcd = true;
1394 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1395
1396 if (aclc->hdr.version == SMC_V2) {
1397 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1398 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1399
1400 if (ini->first_contact_peer) {
1401 struct smc_clc_first_contact_ext *fce =
1402 smc_get_clc_first_contact_ext(aclc_v2, true);
1403
1404 ini->release_nr = fce->release;
1405 rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1406 if (rc)
1407 return rc;
1408 }
1409
1410 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1411 if (rc)
1412 return rc;
1413 }
1414 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1415
1416 /* there is only one lgr role for SMC-D; use server lock */
1417 mutex_lock(&smc_server_lgr_pending);
1418 rc = smc_conn_create(smc, ini);
1419 if (rc) {
1420 mutex_unlock(&smc_server_lgr_pending);
1421 return rc;
1422 }
1423
1424 /* Create send and receive buffers */
1425 rc = smc_buf_create(smc, true);
1426 if (rc) {
1427 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1428 goto connect_abort;
1429 }
1430
1431 smc_conn_save_peer_info(smc, aclc);
1432 smc_close_init(smc);
1433 smc_rx_init(smc);
1434 smc_tx_init(smc);
1435
1436 if (aclc->hdr.version > SMC_V1) {
1437 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1438 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1439
1440 eid = clc_v2->d1.eid;
1441 }
1442
1443 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1444 aclc->hdr.version, eid, ini);
1445 if (rc)
1446 goto connect_abort;
1447 mutex_unlock(&smc_server_lgr_pending);
1448
1449 smc_copy_sock_settings_to_clc(smc);
1450 smc->connect_nonblock = 0;
1451 if (smc->sk.sk_state == SMC_INIT)
1452 smc->sk.sk_state = SMC_ACTIVE;
1453
1454 return 0;
1455 connect_abort:
1456 smc_conn_abort(smc, ini->first_contact_local);
1457 mutex_unlock(&smc_server_lgr_pending);
1458 smc->connect_nonblock = 0;
1459
1460 return rc;
1461 }
1462
1463 /* check if received accept type and version matches a proposed one */
smc_connect_check_aclc(struct smc_init_info * ini,struct smc_clc_msg_accept_confirm * aclc)1464 static int smc_connect_check_aclc(struct smc_init_info *ini,
1465 struct smc_clc_msg_accept_confirm *aclc)
1466 {
1467 if (aclc->hdr.typev1 != SMC_TYPE_R &&
1468 aclc->hdr.typev1 != SMC_TYPE_D)
1469 return SMC_CLC_DECL_MODEUNSUPP;
1470
1471 if (aclc->hdr.version >= SMC_V2) {
1472 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1473 !smcr_indicated(ini->smc_type_v2)) ||
1474 (aclc->hdr.typev1 == SMC_TYPE_D &&
1475 !smcd_indicated(ini->smc_type_v2)))
1476 return SMC_CLC_DECL_MODEUNSUPP;
1477 } else {
1478 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1479 !smcr_indicated(ini->smc_type_v1)) ||
1480 (aclc->hdr.typev1 == SMC_TYPE_D &&
1481 !smcd_indicated(ini->smc_type_v1)))
1482 return SMC_CLC_DECL_MODEUNSUPP;
1483 }
1484
1485 return 0;
1486 }
1487
1488 /* perform steps before actually connecting */
__smc_connect(struct smc_sock * smc)1489 static int __smc_connect(struct smc_sock *smc)
1490 {
1491 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1492 struct smc_clc_msg_accept_confirm_v2 *aclc2;
1493 struct smc_clc_msg_accept_confirm *aclc;
1494 struct smc_init_info *ini = NULL;
1495 u8 *buf = NULL;
1496 int rc = 0;
1497
1498 if (smc->use_fallback)
1499 return smc_connect_fallback(smc, smc->fallback_rsn);
1500
1501 /* if peer has not signalled SMC-capability, fall back */
1502 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1503 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1504
1505 /* IPSec connections opt out of SMC optimizations */
1506 if (using_ipsec(smc))
1507 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1508 version);
1509
1510 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1511 if (!ini)
1512 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1513 version);
1514
1515 ini->smcd_version = SMC_V1 | SMC_V2;
1516 ini->smcr_version = SMC_V1 | SMC_V2;
1517 ini->smc_type_v1 = SMC_TYPE_B;
1518 ini->smc_type_v2 = SMC_TYPE_B;
1519
1520 /* get vlan id from IP device */
1521 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1522 ini->smcd_version &= ~SMC_V1;
1523 ini->smcr_version = 0;
1524 ini->smc_type_v1 = SMC_TYPE_N;
1525 if (!ini->smcd_version) {
1526 rc = SMC_CLC_DECL_GETVLANERR;
1527 goto fallback;
1528 }
1529 }
1530
1531 rc = smc_find_proposal_devices(smc, ini);
1532 if (rc)
1533 goto fallback;
1534
1535 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1536 if (!buf) {
1537 rc = SMC_CLC_DECL_MEM;
1538 goto fallback;
1539 }
1540 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1541 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1542
1543 /* perform CLC handshake */
1544 rc = smc_connect_clc(smc, aclc2, ini);
1545 if (rc) {
1546 /* -EAGAIN on timeout, see tcp_recvmsg() */
1547 if (rc == -EAGAIN) {
1548 rc = -ETIMEDOUT;
1549 smc->sk.sk_err = ETIMEDOUT;
1550 }
1551 goto vlan_cleanup;
1552 }
1553
1554 /* check if smc modes and versions of CLC proposal and accept match */
1555 rc = smc_connect_check_aclc(ini, aclc);
1556 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1557 if (rc)
1558 goto vlan_cleanup;
1559
1560 /* depending on previous steps, connect using rdma or ism */
1561 if (aclc->hdr.typev1 == SMC_TYPE_R) {
1562 ini->smcr_version = version;
1563 rc = smc_connect_rdma(smc, aclc, ini);
1564 } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1565 ini->smcd_version = version;
1566 rc = smc_connect_ism(smc, aclc, ini);
1567 }
1568 if (rc)
1569 goto vlan_cleanup;
1570
1571 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1572 smc_connect_ism_vlan_cleanup(smc, ini);
1573 kfree(buf);
1574 kfree(ini);
1575 return 0;
1576
1577 vlan_cleanup:
1578 smc_connect_ism_vlan_cleanup(smc, ini);
1579 kfree(buf);
1580 fallback:
1581 kfree(ini);
1582 return smc_connect_decline_fallback(smc, rc, version);
1583 }
1584
smc_connect_work(struct work_struct * work)1585 static void smc_connect_work(struct work_struct *work)
1586 {
1587 struct smc_sock *smc = container_of(work, struct smc_sock,
1588 connect_work);
1589 long timeo = smc->sk.sk_sndtimeo;
1590 int rc = 0;
1591
1592 if (!timeo)
1593 timeo = MAX_SCHEDULE_TIMEOUT;
1594 lock_sock(smc->clcsock->sk);
1595 if (smc->clcsock->sk->sk_err) {
1596 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1597 } else if ((1 << smc->clcsock->sk->sk_state) &
1598 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1599 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1600 if ((rc == -EPIPE) &&
1601 ((1 << smc->clcsock->sk->sk_state) &
1602 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1603 rc = 0;
1604 }
1605 release_sock(smc->clcsock->sk);
1606 lock_sock(&smc->sk);
1607 if (rc != 0 || smc->sk.sk_err) {
1608 smc->sk.sk_state = SMC_CLOSED;
1609 if (rc == -EPIPE || rc == -EAGAIN)
1610 smc->sk.sk_err = EPIPE;
1611 else if (rc == -ECONNREFUSED)
1612 smc->sk.sk_err = ECONNREFUSED;
1613 else if (signal_pending(current))
1614 smc->sk.sk_err = -sock_intr_errno(timeo);
1615 sock_put(&smc->sk); /* passive closing */
1616 goto out;
1617 }
1618
1619 rc = __smc_connect(smc);
1620 if (rc < 0)
1621 smc->sk.sk_err = -rc;
1622
1623 out:
1624 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1625 if (smc->sk.sk_err) {
1626 smc->sk.sk_state_change(&smc->sk);
1627 } else { /* allow polling before and after fallback decision */
1628 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1629 smc->sk.sk_write_space(&smc->sk);
1630 }
1631 }
1632 release_sock(&smc->sk);
1633 }
1634
smc_connect(struct socket * sock,struct sockaddr * addr,int alen,int flags)1635 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1636 int alen, int flags)
1637 {
1638 struct sock *sk = sock->sk;
1639 struct smc_sock *smc;
1640 int rc = -EINVAL;
1641
1642 smc = smc_sk(sk);
1643
1644 /* separate smc parameter checking to be safe */
1645 if (alen < sizeof(addr->sa_family))
1646 goto out_err;
1647 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1648 goto out_err;
1649
1650 lock_sock(sk);
1651 switch (sock->state) {
1652 default:
1653 rc = -EINVAL;
1654 goto out;
1655 case SS_CONNECTED:
1656 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1657 goto out;
1658 case SS_CONNECTING:
1659 if (sk->sk_state == SMC_ACTIVE)
1660 goto connected;
1661 break;
1662 case SS_UNCONNECTED:
1663 sock->state = SS_CONNECTING;
1664 break;
1665 }
1666
1667 switch (sk->sk_state) {
1668 default:
1669 goto out;
1670 case SMC_CLOSED:
1671 rc = sock_error(sk) ? : -ECONNABORTED;
1672 sock->state = SS_UNCONNECTED;
1673 goto out;
1674 case SMC_ACTIVE:
1675 rc = -EISCONN;
1676 goto out;
1677 case SMC_INIT:
1678 break;
1679 }
1680
1681 smc_copy_sock_settings_to_clc(smc);
1682 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1683 if (smc->connect_nonblock) {
1684 rc = -EALREADY;
1685 goto out;
1686 }
1687 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1688 if (rc && rc != -EINPROGRESS)
1689 goto out;
1690
1691 if (smc->use_fallback) {
1692 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1693 goto out;
1694 }
1695 sock_hold(&smc->sk); /* sock put in passive closing */
1696 if (flags & O_NONBLOCK) {
1697 if (queue_work(smc_hs_wq, &smc->connect_work))
1698 smc->connect_nonblock = 1;
1699 rc = -EINPROGRESS;
1700 goto out;
1701 } else {
1702 rc = __smc_connect(smc);
1703 if (rc < 0)
1704 goto out;
1705 }
1706
1707 connected:
1708 rc = 0;
1709 sock->state = SS_CONNECTED;
1710 out:
1711 release_sock(sk);
1712 out_err:
1713 return rc;
1714 }
1715
smc_clcsock_accept(struct smc_sock * lsmc,struct smc_sock ** new_smc)1716 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1717 {
1718 struct socket *new_clcsock = NULL;
1719 struct sock *lsk = &lsmc->sk;
1720 struct sock *new_sk;
1721 int rc = -EINVAL;
1722
1723 release_sock(lsk);
1724 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1725 if (!new_sk) {
1726 rc = -ENOMEM;
1727 lsk->sk_err = ENOMEM;
1728 *new_smc = NULL;
1729 lock_sock(lsk);
1730 goto out;
1731 }
1732 *new_smc = smc_sk(new_sk);
1733
1734 mutex_lock(&lsmc->clcsock_release_lock);
1735 if (lsmc->clcsock)
1736 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1737 mutex_unlock(&lsmc->clcsock_release_lock);
1738 lock_sock(lsk);
1739 if (rc < 0 && rc != -EAGAIN)
1740 lsk->sk_err = -rc;
1741 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1742 new_sk->sk_prot->unhash(new_sk);
1743 if (new_clcsock)
1744 sock_release(new_clcsock);
1745 new_sk->sk_state = SMC_CLOSED;
1746 sock_set_flag(new_sk, SOCK_DEAD);
1747 sock_put(new_sk); /* final */
1748 *new_smc = NULL;
1749 goto out;
1750 }
1751
1752 /* new clcsock has inherited the smc listen-specific sk_data_ready
1753 * function; switch it back to the original sk_data_ready function
1754 */
1755 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1756
1757 /* if new clcsock has also inherited the fallback-specific callback
1758 * functions, switch them back to the original ones.
1759 */
1760 if (lsmc->use_fallback) {
1761 if (lsmc->clcsk_state_change)
1762 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1763 if (lsmc->clcsk_write_space)
1764 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1765 if (lsmc->clcsk_error_report)
1766 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1767 }
1768
1769 (*new_smc)->clcsock = new_clcsock;
1770 out:
1771 return rc;
1772 }
1773
1774 /* add a just created sock to the accept queue of the listen sock as
1775 * candidate for a following socket accept call from user space
1776 */
smc_accept_enqueue(struct sock * parent,struct sock * sk)1777 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1778 {
1779 struct smc_sock *par = smc_sk(parent);
1780
1781 sock_hold(sk); /* sock_put in smc_accept_unlink () */
1782 spin_lock(&par->accept_q_lock);
1783 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1784 spin_unlock(&par->accept_q_lock);
1785 sk_acceptq_added(parent);
1786 }
1787
1788 /* remove a socket from the accept queue of its parental listening socket */
smc_accept_unlink(struct sock * sk)1789 static void smc_accept_unlink(struct sock *sk)
1790 {
1791 struct smc_sock *par = smc_sk(sk)->listen_smc;
1792
1793 spin_lock(&par->accept_q_lock);
1794 list_del_init(&smc_sk(sk)->accept_q);
1795 spin_unlock(&par->accept_q_lock);
1796 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1797 sock_put(sk); /* sock_hold in smc_accept_enqueue */
1798 }
1799
1800 /* remove a sock from the accept queue to bind it to a new socket created
1801 * for a socket accept call from user space
1802 */
smc_accept_dequeue(struct sock * parent,struct socket * new_sock)1803 struct sock *smc_accept_dequeue(struct sock *parent,
1804 struct socket *new_sock)
1805 {
1806 struct smc_sock *isk, *n;
1807 struct sock *new_sk;
1808
1809 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1810 new_sk = (struct sock *)isk;
1811
1812 smc_accept_unlink(new_sk);
1813 if (new_sk->sk_state == SMC_CLOSED) {
1814 new_sk->sk_prot->unhash(new_sk);
1815 if (isk->clcsock) {
1816 sock_release(isk->clcsock);
1817 isk->clcsock = NULL;
1818 }
1819 sock_put(new_sk); /* final */
1820 continue;
1821 }
1822 if (new_sock) {
1823 sock_graft(new_sk, new_sock);
1824 new_sock->state = SS_CONNECTED;
1825 if (isk->use_fallback) {
1826 smc_sk(new_sk)->clcsock->file = new_sock->file;
1827 isk->clcsock->file->private_data = isk->clcsock;
1828 }
1829 }
1830 return new_sk;
1831 }
1832 return NULL;
1833 }
1834
1835 /* clean up for a created but never accepted sock */
smc_close_non_accepted(struct sock * sk)1836 void smc_close_non_accepted(struct sock *sk)
1837 {
1838 struct smc_sock *smc = smc_sk(sk);
1839
1840 sock_hold(sk); /* sock_put below */
1841 lock_sock(sk);
1842 if (!sk->sk_lingertime)
1843 /* wait for peer closing */
1844 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
1845 __smc_release(smc);
1846 release_sock(sk);
1847 sock_put(sk); /* sock_hold above */
1848 sock_put(sk); /* final sock_put */
1849 }
1850
smcr_serv_conf_first_link(struct smc_sock * smc)1851 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1852 {
1853 struct smc_link *link = smc->conn.lnk;
1854 struct smc_llc_qentry *qentry;
1855 int rc;
1856
1857 /* reg the sndbuf if it was vzalloced*/
1858 if (smc->conn.sndbuf_desc->is_vm) {
1859 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1860 return SMC_CLC_DECL_ERR_REGBUF;
1861 }
1862
1863 /* reg the rmb */
1864 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1865 return SMC_CLC_DECL_ERR_REGBUF;
1866
1867 /* send CONFIRM LINK request to client over the RoCE fabric */
1868 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1869 if (rc < 0)
1870 return SMC_CLC_DECL_TIMEOUT_CL;
1871
1872 /* receive CONFIRM LINK response from client over the RoCE fabric */
1873 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1874 SMC_LLC_CONFIRM_LINK);
1875 if (!qentry) {
1876 struct smc_clc_msg_decline dclc;
1877
1878 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1879 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1880 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1881 }
1882 smc_llc_save_peer_uid(qentry);
1883 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1884 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1885 if (rc)
1886 return SMC_CLC_DECL_RMBE_EC;
1887
1888 /* confirm_rkey is implicit on 1st contact */
1889 smc->conn.rmb_desc->is_conf_rkey = true;
1890
1891 smc_llc_link_active(link);
1892 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1893
1894 if (link->lgr->max_links > 1) {
1895 down_write(&link->lgr->llc_conf_mutex);
1896 /* initial contact - try to establish second link */
1897 smc_llc_srv_add_link(link, NULL);
1898 up_write(&link->lgr->llc_conf_mutex);
1899 }
1900 return 0;
1901 }
1902
1903 /* listen worker: finish */
smc_listen_out(struct smc_sock * new_smc)1904 static void smc_listen_out(struct smc_sock *new_smc)
1905 {
1906 struct smc_sock *lsmc = new_smc->listen_smc;
1907 struct sock *newsmcsk = &new_smc->sk;
1908
1909 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1910 atomic_dec(&lsmc->queued_smc_hs);
1911
1912 if (lsmc->sk.sk_state == SMC_LISTEN) {
1913 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1914 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1915 release_sock(&lsmc->sk);
1916 } else { /* no longer listening */
1917 smc_close_non_accepted(newsmcsk);
1918 }
1919
1920 /* Wake up accept */
1921 lsmc->sk.sk_data_ready(&lsmc->sk);
1922 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1923 }
1924
1925 /* listen worker: finish in state connected */
smc_listen_out_connected(struct smc_sock * new_smc)1926 static void smc_listen_out_connected(struct smc_sock *new_smc)
1927 {
1928 struct sock *newsmcsk = &new_smc->sk;
1929
1930 if (newsmcsk->sk_state == SMC_INIT)
1931 newsmcsk->sk_state = SMC_ACTIVE;
1932
1933 smc_listen_out(new_smc);
1934 }
1935
1936 /* listen worker: finish in error state */
smc_listen_out_err(struct smc_sock * new_smc)1937 static void smc_listen_out_err(struct smc_sock *new_smc)
1938 {
1939 struct sock *newsmcsk = &new_smc->sk;
1940 struct net *net = sock_net(newsmcsk);
1941
1942 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1943 if (newsmcsk->sk_state == SMC_INIT)
1944 sock_put(&new_smc->sk); /* passive closing */
1945 newsmcsk->sk_state = SMC_CLOSED;
1946
1947 smc_listen_out(new_smc);
1948 }
1949
1950 /* listen worker: decline and fall back if possible */
smc_listen_decline(struct smc_sock * new_smc,int reason_code,int local_first,u8 version)1951 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1952 int local_first, u8 version)
1953 {
1954 /* RDMA setup failed, switch back to TCP */
1955 smc_conn_abort(new_smc, local_first);
1956 if (reason_code < 0 ||
1957 smc_switch_to_fallback(new_smc, reason_code)) {
1958 /* error, no fallback possible */
1959 smc_listen_out_err(new_smc);
1960 return;
1961 }
1962 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1963 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1964 smc_listen_out_err(new_smc);
1965 return;
1966 }
1967 }
1968 smc_listen_out_connected(new_smc);
1969 }
1970
1971 /* listen worker: version checking */
smc_listen_v2_check(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)1972 static int smc_listen_v2_check(struct smc_sock *new_smc,
1973 struct smc_clc_msg_proposal *pclc,
1974 struct smc_init_info *ini)
1975 {
1976 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1977 struct smc_clc_v2_extension *pclc_v2_ext;
1978 int rc = SMC_CLC_DECL_PEERNOSMC;
1979
1980 ini->smc_type_v1 = pclc->hdr.typev1;
1981 ini->smc_type_v2 = pclc->hdr.typev2;
1982 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1983 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1984 if (pclc->hdr.version > SMC_V1) {
1985 if (smcd_indicated(ini->smc_type_v2))
1986 ini->smcd_version |= SMC_V2;
1987 if (smcr_indicated(ini->smc_type_v2))
1988 ini->smcr_version |= SMC_V2;
1989 }
1990 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1991 rc = SMC_CLC_DECL_PEERNOSMC;
1992 goto out;
1993 }
1994 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1995 if (!pclc_v2_ext) {
1996 ini->smcd_version &= ~SMC_V2;
1997 ini->smcr_version &= ~SMC_V2;
1998 rc = SMC_CLC_DECL_NOV2EXT;
1999 goto out;
2000 }
2001 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
2002 if (ini->smcd_version & SMC_V2) {
2003 if (!smc_ism_is_v2_capable()) {
2004 ini->smcd_version &= ~SMC_V2;
2005 rc = SMC_CLC_DECL_NOISM2SUPP;
2006 } else if (!pclc_smcd_v2_ext) {
2007 ini->smcd_version &= ~SMC_V2;
2008 rc = SMC_CLC_DECL_NOV2DEXT;
2009 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2010 !pclc_v2_ext->hdr.flag.seid) {
2011 ini->smcd_version &= ~SMC_V2;
2012 rc = SMC_CLC_DECL_NOUEID;
2013 }
2014 }
2015 if (ini->smcr_version & SMC_V2) {
2016 if (!pclc_v2_ext->hdr.eid_cnt) {
2017 ini->smcr_version &= ~SMC_V2;
2018 rc = SMC_CLC_DECL_NOUEID;
2019 }
2020 }
2021
2022 ini->release_nr = pclc_v2_ext->hdr.flag.release;
2023 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2024 ini->release_nr = SMC_RELEASE;
2025
2026 out:
2027 if (!ini->smcd_version && !ini->smcr_version)
2028 return rc;
2029
2030 return 0;
2031 }
2032
2033 /* listen worker: check prefixes */
smc_listen_prfx_check(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc)2034 static int smc_listen_prfx_check(struct smc_sock *new_smc,
2035 struct smc_clc_msg_proposal *pclc)
2036 {
2037 struct smc_clc_msg_proposal_prefix *pclc_prfx;
2038 struct socket *newclcsock = new_smc->clcsock;
2039
2040 if (pclc->hdr.typev1 == SMC_TYPE_N)
2041 return 0;
2042 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2043 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
2044 return SMC_CLC_DECL_DIFFPREFIX;
2045
2046 return 0;
2047 }
2048
2049 /* listen worker: initialize connection and buffers */
smc_listen_rdma_init(struct smc_sock * new_smc,struct smc_init_info * ini)2050 static int smc_listen_rdma_init(struct smc_sock *new_smc,
2051 struct smc_init_info *ini)
2052 {
2053 int rc;
2054
2055 /* allocate connection / link group */
2056 rc = smc_conn_create(new_smc, ini);
2057 if (rc)
2058 return rc;
2059
2060 /* create send buffer and rmb */
2061 if (smc_buf_create(new_smc, false)) {
2062 smc_conn_abort(new_smc, ini->first_contact_local);
2063 return SMC_CLC_DECL_MEM;
2064 }
2065
2066 return 0;
2067 }
2068
2069 /* listen worker: initialize connection and buffers for SMC-D */
smc_listen_ism_init(struct smc_sock * new_smc,struct smc_init_info * ini)2070 static int smc_listen_ism_init(struct smc_sock *new_smc,
2071 struct smc_init_info *ini)
2072 {
2073 int rc;
2074
2075 rc = smc_conn_create(new_smc, ini);
2076 if (rc)
2077 return rc;
2078
2079 /* Create send and receive buffers */
2080 rc = smc_buf_create(new_smc, true);
2081 if (rc) {
2082 smc_conn_abort(new_smc, ini->first_contact_local);
2083 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2084 SMC_CLC_DECL_MEM;
2085 }
2086
2087 return 0;
2088 }
2089
smc_is_already_selected(struct smcd_dev * smcd,struct smc_init_info * ini,int matches)2090 static bool smc_is_already_selected(struct smcd_dev *smcd,
2091 struct smc_init_info *ini,
2092 int matches)
2093 {
2094 int i;
2095
2096 for (i = 0; i < matches; i++)
2097 if (smcd == ini->ism_dev[i])
2098 return true;
2099
2100 return false;
2101 }
2102
2103 /* check for ISM devices matching proposed ISM devices */
smc_check_ism_v2_match(struct smc_init_info * ini,u16 proposed_chid,u64 proposed_gid,unsigned int * matches)2104 static void smc_check_ism_v2_match(struct smc_init_info *ini,
2105 u16 proposed_chid, u64 proposed_gid,
2106 unsigned int *matches)
2107 {
2108 struct smcd_dev *smcd;
2109
2110 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2111 if (smcd->going_away)
2112 continue;
2113 if (smc_is_already_selected(smcd, ini, *matches))
2114 continue;
2115 if (smc_ism_get_chid(smcd) == proposed_chid &&
2116 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2117 ini->ism_peer_gid[*matches] = proposed_gid;
2118 ini->ism_dev[*matches] = smcd;
2119 (*matches)++;
2120 break;
2121 }
2122 }
2123 }
2124
smc_find_ism_store_rc(u32 rc,struct smc_init_info * ini)2125 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2126 {
2127 if (!ini->rc)
2128 ini->rc = rc;
2129 }
2130
smc_find_ism_v2_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2131 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2132 struct smc_clc_msg_proposal *pclc,
2133 struct smc_init_info *ini)
2134 {
2135 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2136 struct smc_clc_v2_extension *smc_v2_ext;
2137 struct smc_clc_msg_smcd *pclc_smcd;
2138 unsigned int matches = 0;
2139 u8 smcd_version;
2140 u8 *eid = NULL;
2141 int i, rc;
2142
2143 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2144 goto not_found;
2145
2146 pclc_smcd = smc_get_clc_msg_smcd(pclc);
2147 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2148 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2149
2150 mutex_lock(&smcd_dev_list.mutex);
2151 if (pclc_smcd->ism.chid)
2152 /* check for ISM device matching proposed native ISM device */
2153 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2154 ntohll(pclc_smcd->ism.gid), &matches);
2155 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
2156 /* check for ISM devices matching proposed non-native ISM
2157 * devices
2158 */
2159 smc_check_ism_v2_match(ini,
2160 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
2161 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
2162 &matches);
2163 }
2164 mutex_unlock(&smcd_dev_list.mutex);
2165
2166 if (!ini->ism_dev[0]) {
2167 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2168 goto not_found;
2169 }
2170
2171 smc_ism_get_system_eid(&eid);
2172 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2173 smcd_v2_ext->system_eid, eid))
2174 goto not_found;
2175
2176 /* separate - outside the smcd_dev_list.lock */
2177 smcd_version = ini->smcd_version;
2178 for (i = 0; i < matches; i++) {
2179 ini->smcd_version = SMC_V2;
2180 ini->is_smcd = true;
2181 ini->ism_selected = i;
2182 rc = smc_listen_ism_init(new_smc, ini);
2183 if (rc) {
2184 smc_find_ism_store_rc(rc, ini);
2185 /* try next active ISM device */
2186 continue;
2187 }
2188 return; /* matching and usable V2 ISM device found */
2189 }
2190 /* no V2 ISM device could be initialized */
2191 ini->smcd_version = smcd_version; /* restore original value */
2192 ini->negotiated_eid[0] = 0;
2193
2194 not_found:
2195 ini->smcd_version &= ~SMC_V2;
2196 ini->ism_dev[0] = NULL;
2197 ini->is_smcd = false;
2198 }
2199
smc_find_ism_v1_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2200 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2201 struct smc_clc_msg_proposal *pclc,
2202 struct smc_init_info *ini)
2203 {
2204 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2205 int rc = 0;
2206
2207 /* check if ISM V1 is available */
2208 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2209 goto not_found;
2210 ini->is_smcd = true; /* prepare ISM check */
2211 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
2212 rc = smc_find_ism_device(new_smc, ini);
2213 if (rc)
2214 goto not_found;
2215 ini->ism_selected = 0;
2216 rc = smc_listen_ism_init(new_smc, ini);
2217 if (!rc)
2218 return; /* V1 ISM device found */
2219
2220 not_found:
2221 smc_find_ism_store_rc(rc, ini);
2222 ini->smcd_version &= ~SMC_V1;
2223 ini->ism_dev[0] = NULL;
2224 ini->is_smcd = false;
2225 }
2226
2227 /* listen worker: register buffers */
smc_listen_rdma_reg(struct smc_sock * new_smc,bool local_first)2228 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2229 {
2230 struct smc_connection *conn = &new_smc->conn;
2231
2232 if (!local_first) {
2233 /* reg sendbufs if they were vzalloced */
2234 if (conn->sndbuf_desc->is_vm) {
2235 if (smcr_lgr_reg_sndbufs(conn->lnk,
2236 conn->sndbuf_desc))
2237 return SMC_CLC_DECL_ERR_REGBUF;
2238 }
2239 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2240 return SMC_CLC_DECL_ERR_REGBUF;
2241 }
2242
2243 return 0;
2244 }
2245
smc_find_rdma_v2_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2246 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2247 struct smc_clc_msg_proposal *pclc,
2248 struct smc_init_info *ini)
2249 {
2250 struct smc_clc_v2_extension *smc_v2_ext;
2251 u8 smcr_version;
2252 int rc;
2253
2254 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2255 goto not_found;
2256
2257 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2258 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2259 goto not_found;
2260
2261 /* prepare RDMA check */
2262 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2263 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2264 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2265 ini->check_smcrv2 = true;
2266 ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2267 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2268 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2269 rc = smc_find_rdma_device(new_smc, ini);
2270 if (rc) {
2271 smc_find_ism_store_rc(rc, ini);
2272 goto not_found;
2273 }
2274 if (!ini->smcrv2.uses_gateway)
2275 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2276
2277 smcr_version = ini->smcr_version;
2278 ini->smcr_version = SMC_V2;
2279 rc = smc_listen_rdma_init(new_smc, ini);
2280 if (!rc) {
2281 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2282 if (rc)
2283 smc_conn_abort(new_smc, ini->first_contact_local);
2284 }
2285 if (!rc)
2286 return;
2287 ini->smcr_version = smcr_version;
2288 smc_find_ism_store_rc(rc, ini);
2289
2290 not_found:
2291 ini->smcr_version &= ~SMC_V2;
2292 ini->smcrv2.ib_dev_v2 = NULL;
2293 ini->check_smcrv2 = false;
2294 }
2295
smc_find_rdma_v1_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2296 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2297 struct smc_clc_msg_proposal *pclc,
2298 struct smc_init_info *ini)
2299 {
2300 int rc;
2301
2302 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2303 return SMC_CLC_DECL_NOSMCDEV;
2304
2305 /* prepare RDMA check */
2306 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2307 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2308 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2309 rc = smc_find_rdma_device(new_smc, ini);
2310 if (rc) {
2311 /* no RDMA device found */
2312 return SMC_CLC_DECL_NOSMCDEV;
2313 }
2314 rc = smc_listen_rdma_init(new_smc, ini);
2315 if (rc)
2316 return rc;
2317 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2318 }
2319
2320 /* determine the local device matching to proposal */
smc_listen_find_device(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2321 static int smc_listen_find_device(struct smc_sock *new_smc,
2322 struct smc_clc_msg_proposal *pclc,
2323 struct smc_init_info *ini)
2324 {
2325 int prfx_rc;
2326
2327 /* check for ISM device matching V2 proposed device */
2328 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2329 if (ini->ism_dev[0])
2330 return 0;
2331
2332 /* check for matching IP prefix and subnet length (V1) */
2333 prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2334 if (prfx_rc)
2335 smc_find_ism_store_rc(prfx_rc, ini);
2336
2337 /* get vlan id from IP device */
2338 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2339 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2340
2341 /* check for ISM device matching V1 proposed device */
2342 if (!prfx_rc)
2343 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2344 if (ini->ism_dev[0])
2345 return 0;
2346
2347 if (!smcr_indicated(pclc->hdr.typev1) &&
2348 !smcr_indicated(pclc->hdr.typev2))
2349 /* skip RDMA and decline */
2350 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2351
2352 /* check if RDMA V2 is available */
2353 smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2354 if (ini->smcrv2.ib_dev_v2)
2355 return 0;
2356
2357 /* check if RDMA V1 is available */
2358 if (!prfx_rc) {
2359 int rc;
2360
2361 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2362 smc_find_ism_store_rc(rc, ini);
2363 return (!rc) ? 0 : ini->rc;
2364 }
2365 return prfx_rc;
2366 }
2367
2368 /* listen worker: finish RDMA setup */
smc_listen_rdma_finish(struct smc_sock * new_smc,struct smc_clc_msg_accept_confirm * cclc,bool local_first,struct smc_init_info * ini)2369 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2370 struct smc_clc_msg_accept_confirm *cclc,
2371 bool local_first,
2372 struct smc_init_info *ini)
2373 {
2374 struct smc_link *link = new_smc->conn.lnk;
2375 int reason_code = 0;
2376
2377 if (local_first)
2378 smc_link_save_peer_info(link, cclc, ini);
2379
2380 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2381 return SMC_CLC_DECL_ERR_RTOK;
2382
2383 if (local_first) {
2384 if (smc_ib_ready_link(link))
2385 return SMC_CLC_DECL_ERR_RDYLNK;
2386 /* QP confirmation over RoCE fabric */
2387 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2388 reason_code = smcr_serv_conf_first_link(new_smc);
2389 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2390 }
2391 return reason_code;
2392 }
2393
2394 /* setup for connection of server */
smc_listen_work(struct work_struct * work)2395 static void smc_listen_work(struct work_struct *work)
2396 {
2397 struct smc_sock *new_smc = container_of(work, struct smc_sock,
2398 smc_listen_work);
2399 struct socket *newclcsock = new_smc->clcsock;
2400 struct smc_clc_msg_accept_confirm *cclc;
2401 struct smc_clc_msg_proposal_area *buf;
2402 struct smc_clc_msg_proposal *pclc;
2403 struct smc_init_info *ini = NULL;
2404 u8 proposal_version = SMC_V1;
2405 u8 accept_version;
2406 int rc = 0;
2407
2408 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2409 return smc_listen_out_err(new_smc);
2410
2411 if (new_smc->use_fallback) {
2412 smc_listen_out_connected(new_smc);
2413 return;
2414 }
2415
2416 /* check if peer is smc capable */
2417 if (!tcp_sk(newclcsock->sk)->syn_smc) {
2418 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2419 if (rc)
2420 smc_listen_out_err(new_smc);
2421 else
2422 smc_listen_out_connected(new_smc);
2423 return;
2424 }
2425
2426 /* do inband token exchange -
2427 * wait for and receive SMC Proposal CLC message
2428 */
2429 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2430 if (!buf) {
2431 rc = SMC_CLC_DECL_MEM;
2432 goto out_decl;
2433 }
2434 pclc = (struct smc_clc_msg_proposal *)buf;
2435 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2436 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2437 if (rc)
2438 goto out_decl;
2439
2440 if (pclc->hdr.version > SMC_V1)
2441 proposal_version = SMC_V2;
2442
2443 /* IPSec connections opt out of SMC optimizations */
2444 if (using_ipsec(new_smc)) {
2445 rc = SMC_CLC_DECL_IPSEC;
2446 goto out_decl;
2447 }
2448
2449 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2450 if (!ini) {
2451 rc = SMC_CLC_DECL_MEM;
2452 goto out_decl;
2453 }
2454
2455 /* initial version checking */
2456 rc = smc_listen_v2_check(new_smc, pclc, ini);
2457 if (rc)
2458 goto out_decl;
2459
2460 rc = smc_clc_srv_v2x_features_validate(pclc, ini);
2461 if (rc)
2462 goto out_decl;
2463
2464 mutex_lock(&smc_server_lgr_pending);
2465 smc_close_init(new_smc);
2466 smc_rx_init(new_smc);
2467 smc_tx_init(new_smc);
2468
2469 /* determine ISM or RoCE device used for connection */
2470 rc = smc_listen_find_device(new_smc, pclc, ini);
2471 if (rc)
2472 goto out_unlock;
2473
2474 /* send SMC Accept CLC message */
2475 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2476 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2477 accept_version, ini->negotiated_eid, ini);
2478 if (rc)
2479 goto out_unlock;
2480
2481 /* SMC-D does not need this lock any more */
2482 if (ini->is_smcd)
2483 mutex_unlock(&smc_server_lgr_pending);
2484
2485 /* receive SMC Confirm CLC message */
2486 memset(buf, 0, sizeof(*buf));
2487 cclc = (struct smc_clc_msg_accept_confirm *)buf;
2488 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2489 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2490 if (rc) {
2491 if (!ini->is_smcd)
2492 goto out_unlock;
2493 goto out_decl;
2494 }
2495
2496 rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2497 if (rc) {
2498 if (!ini->is_smcd)
2499 goto out_unlock;
2500 goto out_decl;
2501 }
2502
2503 /* fce smc release version is needed in smc_listen_rdma_finish,
2504 * so save fce info here.
2505 */
2506 smc_conn_save_peer_info_fce(new_smc, cclc);
2507
2508 /* finish worker */
2509 if (!ini->is_smcd) {
2510 rc = smc_listen_rdma_finish(new_smc, cclc,
2511 ini->first_contact_local, ini);
2512 if (rc)
2513 goto out_unlock;
2514 mutex_unlock(&smc_server_lgr_pending);
2515 }
2516 smc_conn_save_peer_info(new_smc, cclc);
2517 smc_listen_out_connected(new_smc);
2518 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2519 goto out_free;
2520
2521 out_unlock:
2522 mutex_unlock(&smc_server_lgr_pending);
2523 out_decl:
2524 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2525 proposal_version);
2526 out_free:
2527 kfree(ini);
2528 kfree(buf);
2529 }
2530
smc_tcp_listen_work(struct work_struct * work)2531 static void smc_tcp_listen_work(struct work_struct *work)
2532 {
2533 struct smc_sock *lsmc = container_of(work, struct smc_sock,
2534 tcp_listen_work);
2535 struct sock *lsk = &lsmc->sk;
2536 struct smc_sock *new_smc;
2537 int rc = 0;
2538
2539 lock_sock(lsk);
2540 while (lsk->sk_state == SMC_LISTEN) {
2541 rc = smc_clcsock_accept(lsmc, &new_smc);
2542 if (rc) /* clcsock accept queue empty or error */
2543 goto out;
2544 if (!new_smc)
2545 continue;
2546
2547 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2548 atomic_inc(&lsmc->queued_smc_hs);
2549
2550 new_smc->listen_smc = lsmc;
2551 new_smc->use_fallback = lsmc->use_fallback;
2552 new_smc->fallback_rsn = lsmc->fallback_rsn;
2553 sock_hold(lsk); /* sock_put in smc_listen_work */
2554 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2555 smc_copy_sock_settings_to_smc(new_smc);
2556 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2557 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2558 sock_put(&new_smc->sk);
2559 }
2560
2561 out:
2562 release_sock(lsk);
2563 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2564 }
2565
smc_clcsock_data_ready(struct sock * listen_clcsock)2566 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2567 {
2568 struct smc_sock *lsmc;
2569
2570 read_lock_bh(&listen_clcsock->sk_callback_lock);
2571 lsmc = smc_clcsock_user_data(listen_clcsock);
2572 if (!lsmc)
2573 goto out;
2574 lsmc->clcsk_data_ready(listen_clcsock);
2575 if (lsmc->sk.sk_state == SMC_LISTEN) {
2576 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2577 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2578 sock_put(&lsmc->sk);
2579 }
2580 out:
2581 read_unlock_bh(&listen_clcsock->sk_callback_lock);
2582 }
2583
smc_listen(struct socket * sock,int backlog)2584 static int smc_listen(struct socket *sock, int backlog)
2585 {
2586 struct sock *sk = sock->sk;
2587 struct smc_sock *smc;
2588 int rc;
2589
2590 smc = smc_sk(sk);
2591 lock_sock(sk);
2592
2593 rc = -EINVAL;
2594 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2595 smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2596 goto out;
2597
2598 rc = 0;
2599 if (sk->sk_state == SMC_LISTEN) {
2600 sk->sk_max_ack_backlog = backlog;
2601 goto out;
2602 }
2603 /* some socket options are handled in core, so we could not apply
2604 * them to the clc socket -- copy smc socket options to clc socket
2605 */
2606 smc_copy_sock_settings_to_clc(smc);
2607 if (!smc->use_fallback)
2608 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2609
2610 /* save original sk_data_ready function and establish
2611 * smc-specific sk_data_ready function
2612 */
2613 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2614 smc->clcsock->sk->sk_user_data =
2615 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2616 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2617 smc_clcsock_data_ready, &smc->clcsk_data_ready);
2618 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2619
2620 /* save original ops */
2621 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2622
2623 smc->af_ops = *smc->ori_af_ops;
2624 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2625
2626 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2627
2628 if (smc->limit_smc_hs)
2629 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2630
2631 rc = kernel_listen(smc->clcsock, backlog);
2632 if (rc) {
2633 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2634 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2635 &smc->clcsk_data_ready);
2636 smc->clcsock->sk->sk_user_data = NULL;
2637 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2638 goto out;
2639 }
2640 sk->sk_max_ack_backlog = backlog;
2641 sk->sk_ack_backlog = 0;
2642 sk->sk_state = SMC_LISTEN;
2643
2644 out:
2645 release_sock(sk);
2646 return rc;
2647 }
2648
smc_accept(struct socket * sock,struct socket * new_sock,int flags,bool kern)2649 static int smc_accept(struct socket *sock, struct socket *new_sock,
2650 int flags, bool kern)
2651 {
2652 struct sock *sk = sock->sk, *nsk;
2653 DECLARE_WAITQUEUE(wait, current);
2654 struct smc_sock *lsmc;
2655 long timeo;
2656 int rc = 0;
2657
2658 lsmc = smc_sk(sk);
2659 sock_hold(sk); /* sock_put below */
2660 lock_sock(sk);
2661
2662 if (lsmc->sk.sk_state != SMC_LISTEN) {
2663 rc = -EINVAL;
2664 release_sock(sk);
2665 goto out;
2666 }
2667
2668 /* Wait for an incoming connection */
2669 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2670 add_wait_queue_exclusive(sk_sleep(sk), &wait);
2671 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2672 set_current_state(TASK_INTERRUPTIBLE);
2673 if (!timeo) {
2674 rc = -EAGAIN;
2675 break;
2676 }
2677 release_sock(sk);
2678 timeo = schedule_timeout(timeo);
2679 /* wakeup by sk_data_ready in smc_listen_work() */
2680 sched_annotate_sleep();
2681 lock_sock(sk);
2682 if (signal_pending(current)) {
2683 rc = sock_intr_errno(timeo);
2684 break;
2685 }
2686 }
2687 set_current_state(TASK_RUNNING);
2688 remove_wait_queue(sk_sleep(sk), &wait);
2689
2690 if (!rc)
2691 rc = sock_error(nsk);
2692 release_sock(sk);
2693 if (rc)
2694 goto out;
2695
2696 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2697 /* wait till data arrives on the socket */
2698 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2699 MSEC_PER_SEC);
2700 if (smc_sk(nsk)->use_fallback) {
2701 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2702
2703 lock_sock(clcsk);
2704 if (skb_queue_empty(&clcsk->sk_receive_queue))
2705 sk_wait_data(clcsk, &timeo, NULL);
2706 release_sock(clcsk);
2707 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2708 lock_sock(nsk);
2709 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2710 release_sock(nsk);
2711 }
2712 }
2713
2714 out:
2715 sock_put(sk); /* sock_hold above */
2716 return rc;
2717 }
2718
smc_getname(struct socket * sock,struct sockaddr * addr,int peer)2719 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2720 int peer)
2721 {
2722 struct smc_sock *smc;
2723
2724 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2725 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2726 return -ENOTCONN;
2727
2728 smc = smc_sk(sock->sk);
2729
2730 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2731 }
2732
smc_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)2733 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2734 {
2735 struct sock *sk = sock->sk;
2736 struct smc_sock *smc;
2737 int rc;
2738
2739 smc = smc_sk(sk);
2740 lock_sock(sk);
2741
2742 /* SMC does not support connect with fastopen */
2743 if (msg->msg_flags & MSG_FASTOPEN) {
2744 /* not connected yet, fallback */
2745 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2746 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2747 if (rc)
2748 goto out;
2749 } else {
2750 rc = -EINVAL;
2751 goto out;
2752 }
2753 } else if ((sk->sk_state != SMC_ACTIVE) &&
2754 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2755 (sk->sk_state != SMC_INIT)) {
2756 rc = -EPIPE;
2757 goto out;
2758 }
2759
2760 if (smc->use_fallback) {
2761 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2762 } else {
2763 rc = smc_tx_sendmsg(smc, msg, len);
2764 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2765 }
2766 out:
2767 release_sock(sk);
2768 return rc;
2769 }
2770
smc_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)2771 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2772 int flags)
2773 {
2774 struct sock *sk = sock->sk;
2775 struct smc_sock *smc;
2776 int rc = -ENOTCONN;
2777
2778 smc = smc_sk(sk);
2779 lock_sock(sk);
2780 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2781 /* socket was connected before, no more data to read */
2782 rc = 0;
2783 goto out;
2784 }
2785 if ((sk->sk_state == SMC_INIT) ||
2786 (sk->sk_state == SMC_LISTEN) ||
2787 (sk->sk_state == SMC_CLOSED))
2788 goto out;
2789
2790 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2791 rc = 0;
2792 goto out;
2793 }
2794
2795 if (smc->use_fallback) {
2796 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2797 } else {
2798 msg->msg_namelen = 0;
2799 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2800 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2801 }
2802
2803 out:
2804 release_sock(sk);
2805 return rc;
2806 }
2807
smc_accept_poll(struct sock * parent)2808 static __poll_t smc_accept_poll(struct sock *parent)
2809 {
2810 struct smc_sock *isk = smc_sk(parent);
2811 __poll_t mask = 0;
2812
2813 spin_lock(&isk->accept_q_lock);
2814 if (!list_empty(&isk->accept_q))
2815 mask = EPOLLIN | EPOLLRDNORM;
2816 spin_unlock(&isk->accept_q_lock);
2817
2818 return mask;
2819 }
2820
smc_poll(struct file * file,struct socket * sock,poll_table * wait)2821 static __poll_t smc_poll(struct file *file, struct socket *sock,
2822 poll_table *wait)
2823 {
2824 struct sock *sk = sock->sk;
2825 struct smc_sock *smc;
2826 __poll_t mask = 0;
2827
2828 if (!sk)
2829 return EPOLLNVAL;
2830
2831 smc = smc_sk(sock->sk);
2832 if (smc->use_fallback) {
2833 /* delegate to CLC child sock */
2834 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2835 sk->sk_err = smc->clcsock->sk->sk_err;
2836 } else {
2837 if (sk->sk_state != SMC_CLOSED)
2838 sock_poll_wait(file, sock, wait);
2839 if (sk->sk_err)
2840 mask |= EPOLLERR;
2841 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2842 (sk->sk_state == SMC_CLOSED))
2843 mask |= EPOLLHUP;
2844 if (sk->sk_state == SMC_LISTEN) {
2845 /* woken up by sk_data_ready in smc_listen_work() */
2846 mask |= smc_accept_poll(sk);
2847 } else if (smc->use_fallback) { /* as result of connect_work()*/
2848 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2849 wait);
2850 sk->sk_err = smc->clcsock->sk->sk_err;
2851 } else {
2852 if ((sk->sk_state != SMC_INIT &&
2853 atomic_read(&smc->conn.sndbuf_space)) ||
2854 sk->sk_shutdown & SEND_SHUTDOWN) {
2855 mask |= EPOLLOUT | EPOLLWRNORM;
2856 } else {
2857 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2858 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2859 }
2860 if (atomic_read(&smc->conn.bytes_to_rcv))
2861 mask |= EPOLLIN | EPOLLRDNORM;
2862 if (sk->sk_shutdown & RCV_SHUTDOWN)
2863 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2864 if (sk->sk_state == SMC_APPCLOSEWAIT1)
2865 mask |= EPOLLIN;
2866 if (smc->conn.urg_state == SMC_URG_VALID)
2867 mask |= EPOLLPRI;
2868 }
2869 }
2870
2871 return mask;
2872 }
2873
smc_shutdown(struct socket * sock,int how)2874 static int smc_shutdown(struct socket *sock, int how)
2875 {
2876 struct sock *sk = sock->sk;
2877 bool do_shutdown = true;
2878 struct smc_sock *smc;
2879 int rc = -EINVAL;
2880 int old_state;
2881 int rc1 = 0;
2882
2883 smc = smc_sk(sk);
2884
2885 if ((how < SHUT_RD) || (how > SHUT_RDWR))
2886 return rc;
2887
2888 lock_sock(sk);
2889
2890 if (sock->state == SS_CONNECTING) {
2891 if (sk->sk_state == SMC_ACTIVE)
2892 sock->state = SS_CONNECTED;
2893 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2894 sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2895 sk->sk_state == SMC_APPCLOSEWAIT1 ||
2896 sk->sk_state == SMC_APPCLOSEWAIT2 ||
2897 sk->sk_state == SMC_APPFINCLOSEWAIT)
2898 sock->state = SS_DISCONNECTING;
2899 }
2900
2901 rc = -ENOTCONN;
2902 if ((sk->sk_state != SMC_ACTIVE) &&
2903 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2904 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2905 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2906 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2907 (sk->sk_state != SMC_APPFINCLOSEWAIT))
2908 goto out;
2909 if (smc->use_fallback) {
2910 rc = kernel_sock_shutdown(smc->clcsock, how);
2911 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2912 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2913 sk->sk_state = SMC_CLOSED;
2914 sk->sk_socket->state = SS_UNCONNECTED;
2915 sock_put(sk);
2916 }
2917 goto out;
2918 }
2919 switch (how) {
2920 case SHUT_RDWR: /* shutdown in both directions */
2921 old_state = sk->sk_state;
2922 rc = smc_close_active(smc);
2923 if (old_state == SMC_ACTIVE &&
2924 sk->sk_state == SMC_PEERCLOSEWAIT1)
2925 do_shutdown = false;
2926 break;
2927 case SHUT_WR:
2928 rc = smc_close_shutdown_write(smc);
2929 break;
2930 case SHUT_RD:
2931 rc = 0;
2932 /* nothing more to do because peer is not involved */
2933 break;
2934 }
2935 if (do_shutdown && smc->clcsock)
2936 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2937 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2938 sk->sk_shutdown |= how + 1;
2939
2940 if (sk->sk_state == SMC_CLOSED)
2941 sock->state = SS_UNCONNECTED;
2942 else
2943 sock->state = SS_DISCONNECTING;
2944 out:
2945 release_sock(sk);
2946 return rc ? rc : rc1;
2947 }
2948
__smc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)2949 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2950 char __user *optval, int __user *optlen)
2951 {
2952 struct smc_sock *smc;
2953 int val, len;
2954
2955 smc = smc_sk(sock->sk);
2956
2957 if (get_user(len, optlen))
2958 return -EFAULT;
2959
2960 len = min_t(int, len, sizeof(int));
2961
2962 if (len < 0)
2963 return -EINVAL;
2964
2965 switch (optname) {
2966 case SMC_LIMIT_HS:
2967 val = smc->limit_smc_hs;
2968 break;
2969 default:
2970 return -EOPNOTSUPP;
2971 }
2972
2973 if (put_user(len, optlen))
2974 return -EFAULT;
2975 if (copy_to_user(optval, &val, len))
2976 return -EFAULT;
2977
2978 return 0;
2979 }
2980
__smc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)2981 static int __smc_setsockopt(struct socket *sock, int level, int optname,
2982 sockptr_t optval, unsigned int optlen)
2983 {
2984 struct sock *sk = sock->sk;
2985 struct smc_sock *smc;
2986 int val, rc;
2987
2988 smc = smc_sk(sk);
2989
2990 lock_sock(sk);
2991 switch (optname) {
2992 case SMC_LIMIT_HS:
2993 if (optlen < sizeof(int)) {
2994 rc = -EINVAL;
2995 break;
2996 }
2997 if (copy_from_sockptr(&val, optval, sizeof(int))) {
2998 rc = -EFAULT;
2999 break;
3000 }
3001
3002 smc->limit_smc_hs = !!val;
3003 rc = 0;
3004 break;
3005 default:
3006 rc = -EOPNOTSUPP;
3007 break;
3008 }
3009 release_sock(sk);
3010
3011 return rc;
3012 }
3013
smc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)3014 static int smc_setsockopt(struct socket *sock, int level, int optname,
3015 sockptr_t optval, unsigned int optlen)
3016 {
3017 struct sock *sk = sock->sk;
3018 struct smc_sock *smc;
3019 int val, rc;
3020
3021 if (level == SOL_TCP && optname == TCP_ULP)
3022 return -EOPNOTSUPP;
3023 else if (level == SOL_SMC)
3024 return __smc_setsockopt(sock, level, optname, optval, optlen);
3025
3026 smc = smc_sk(sk);
3027
3028 /* generic setsockopts reaching us here always apply to the
3029 * CLC socket
3030 */
3031 mutex_lock(&smc->clcsock_release_lock);
3032 if (!smc->clcsock) {
3033 mutex_unlock(&smc->clcsock_release_lock);
3034 return -EBADF;
3035 }
3036 if (unlikely(!smc->clcsock->ops->setsockopt))
3037 rc = -EOPNOTSUPP;
3038 else
3039 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3040 optval, optlen);
3041 if (smc->clcsock->sk->sk_err) {
3042 sk->sk_err = smc->clcsock->sk->sk_err;
3043 sk_error_report(sk);
3044 }
3045 mutex_unlock(&smc->clcsock_release_lock);
3046
3047 if (optlen < sizeof(int))
3048 return -EINVAL;
3049 if (copy_from_sockptr(&val, optval, sizeof(int)))
3050 return -EFAULT;
3051
3052 lock_sock(sk);
3053 if (rc || smc->use_fallback)
3054 goto out;
3055 switch (optname) {
3056 case TCP_FASTOPEN:
3057 case TCP_FASTOPEN_CONNECT:
3058 case TCP_FASTOPEN_KEY:
3059 case TCP_FASTOPEN_NO_COOKIE:
3060 /* option not supported by SMC */
3061 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
3062 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
3063 } else {
3064 rc = -EINVAL;
3065 }
3066 break;
3067 case TCP_NODELAY:
3068 if (sk->sk_state != SMC_INIT &&
3069 sk->sk_state != SMC_LISTEN &&
3070 sk->sk_state != SMC_CLOSED) {
3071 if (val) {
3072 SMC_STAT_INC(smc, ndly_cnt);
3073 smc_tx_pending(&smc->conn);
3074 cancel_delayed_work(&smc->conn.tx_work);
3075 }
3076 }
3077 break;
3078 case TCP_CORK:
3079 if (sk->sk_state != SMC_INIT &&
3080 sk->sk_state != SMC_LISTEN &&
3081 sk->sk_state != SMC_CLOSED) {
3082 if (!val) {
3083 SMC_STAT_INC(smc, cork_cnt);
3084 smc_tx_pending(&smc->conn);
3085 cancel_delayed_work(&smc->conn.tx_work);
3086 }
3087 }
3088 break;
3089 case TCP_DEFER_ACCEPT:
3090 smc->sockopt_defer_accept = val;
3091 break;
3092 default:
3093 break;
3094 }
3095 out:
3096 release_sock(sk);
3097
3098 return rc;
3099 }
3100
smc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)3101 static int smc_getsockopt(struct socket *sock, int level, int optname,
3102 char __user *optval, int __user *optlen)
3103 {
3104 struct smc_sock *smc;
3105 int rc;
3106
3107 if (level == SOL_SMC)
3108 return __smc_getsockopt(sock, level, optname, optval, optlen);
3109
3110 smc = smc_sk(sock->sk);
3111 mutex_lock(&smc->clcsock_release_lock);
3112 if (!smc->clcsock) {
3113 mutex_unlock(&smc->clcsock_release_lock);
3114 return -EBADF;
3115 }
3116 /* socket options apply to the CLC socket */
3117 if (unlikely(!smc->clcsock->ops->getsockopt)) {
3118 mutex_unlock(&smc->clcsock_release_lock);
3119 return -EOPNOTSUPP;
3120 }
3121 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3122 optval, optlen);
3123 mutex_unlock(&smc->clcsock_release_lock);
3124 return rc;
3125 }
3126
smc_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)3127 static int smc_ioctl(struct socket *sock, unsigned int cmd,
3128 unsigned long arg)
3129 {
3130 union smc_host_cursor cons, urg;
3131 struct smc_connection *conn;
3132 struct smc_sock *smc;
3133 int answ;
3134
3135 smc = smc_sk(sock->sk);
3136 conn = &smc->conn;
3137 lock_sock(&smc->sk);
3138 if (smc->use_fallback) {
3139 if (!smc->clcsock) {
3140 release_sock(&smc->sk);
3141 return -EBADF;
3142 }
3143 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3144 release_sock(&smc->sk);
3145 return answ;
3146 }
3147 switch (cmd) {
3148 case SIOCINQ: /* same as FIONREAD */
3149 if (smc->sk.sk_state == SMC_LISTEN) {
3150 release_sock(&smc->sk);
3151 return -EINVAL;
3152 }
3153 if (smc->sk.sk_state == SMC_INIT ||
3154 smc->sk.sk_state == SMC_CLOSED)
3155 answ = 0;
3156 else
3157 answ = atomic_read(&smc->conn.bytes_to_rcv);
3158 break;
3159 case SIOCOUTQ:
3160 /* output queue size (not send + not acked) */
3161 if (smc->sk.sk_state == SMC_LISTEN) {
3162 release_sock(&smc->sk);
3163 return -EINVAL;
3164 }
3165 if (smc->sk.sk_state == SMC_INIT ||
3166 smc->sk.sk_state == SMC_CLOSED)
3167 answ = 0;
3168 else
3169 answ = smc->conn.sndbuf_desc->len -
3170 atomic_read(&smc->conn.sndbuf_space);
3171 break;
3172 case SIOCOUTQNSD:
3173 /* output queue size (not send only) */
3174 if (smc->sk.sk_state == SMC_LISTEN) {
3175 release_sock(&smc->sk);
3176 return -EINVAL;
3177 }
3178 if (smc->sk.sk_state == SMC_INIT ||
3179 smc->sk.sk_state == SMC_CLOSED)
3180 answ = 0;
3181 else
3182 answ = smc_tx_prepared_sends(&smc->conn);
3183 break;
3184 case SIOCATMARK:
3185 if (smc->sk.sk_state == SMC_LISTEN) {
3186 release_sock(&smc->sk);
3187 return -EINVAL;
3188 }
3189 if (smc->sk.sk_state == SMC_INIT ||
3190 smc->sk.sk_state == SMC_CLOSED) {
3191 answ = 0;
3192 } else {
3193 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3194 smc_curs_copy(&urg, &conn->urg_curs, conn);
3195 answ = smc_curs_diff(conn->rmb_desc->len,
3196 &cons, &urg) == 1;
3197 }
3198 break;
3199 default:
3200 release_sock(&smc->sk);
3201 return -ENOIOCTLCMD;
3202 }
3203 release_sock(&smc->sk);
3204
3205 return put_user(answ, (int __user *)arg);
3206 }
3207
3208 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3209 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3210 * updates till whenever a respective page has been fully processed.
3211 * Note that subsequent recv() calls have to wait till all splice() processing
3212 * completed.
3213 */
smc_splice_read(struct socket * sock,loff_t * ppos,struct pipe_inode_info * pipe,size_t len,unsigned int flags)3214 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3215 struct pipe_inode_info *pipe, size_t len,
3216 unsigned int flags)
3217 {
3218 struct sock *sk = sock->sk;
3219 struct smc_sock *smc;
3220 int rc = -ENOTCONN;
3221
3222 smc = smc_sk(sk);
3223 lock_sock(sk);
3224 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3225 /* socket was connected before, no more data to read */
3226 rc = 0;
3227 goto out;
3228 }
3229 if (sk->sk_state == SMC_INIT ||
3230 sk->sk_state == SMC_LISTEN ||
3231 sk->sk_state == SMC_CLOSED)
3232 goto out;
3233
3234 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3235 rc = 0;
3236 goto out;
3237 }
3238
3239 if (smc->use_fallback) {
3240 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3241 pipe, len, flags);
3242 } else {
3243 if (*ppos) {
3244 rc = -ESPIPE;
3245 goto out;
3246 }
3247 if (flags & SPLICE_F_NONBLOCK)
3248 flags = MSG_DONTWAIT;
3249 else
3250 flags = 0;
3251 SMC_STAT_INC(smc, splice_cnt);
3252 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3253 }
3254 out:
3255 release_sock(sk);
3256
3257 return rc;
3258 }
3259
3260 /* must look like tcp */
3261 static const struct proto_ops smc_sock_ops = {
3262 .family = PF_SMC,
3263 .owner = THIS_MODULE,
3264 .release = smc_release,
3265 .bind = smc_bind,
3266 .connect = smc_connect,
3267 .socketpair = sock_no_socketpair,
3268 .accept = smc_accept,
3269 .getname = smc_getname,
3270 .poll = smc_poll,
3271 .ioctl = smc_ioctl,
3272 .listen = smc_listen,
3273 .shutdown = smc_shutdown,
3274 .setsockopt = smc_setsockopt,
3275 .getsockopt = smc_getsockopt,
3276 .sendmsg = smc_sendmsg,
3277 .recvmsg = smc_recvmsg,
3278 .mmap = sock_no_mmap,
3279 .splice_read = smc_splice_read,
3280 };
3281
__smc_create(struct net * net,struct socket * sock,int protocol,int kern,struct socket * clcsock)3282 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3283 int kern, struct socket *clcsock)
3284 {
3285 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3286 struct smc_sock *smc;
3287 struct sock *sk;
3288 int rc;
3289
3290 rc = -ESOCKTNOSUPPORT;
3291 if (sock->type != SOCK_STREAM)
3292 goto out;
3293
3294 rc = -EPROTONOSUPPORT;
3295 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3296 goto out;
3297
3298 rc = -ENOBUFS;
3299 sock->ops = &smc_sock_ops;
3300 sock->state = SS_UNCONNECTED;
3301 sk = smc_sock_alloc(net, sock, protocol);
3302 if (!sk)
3303 goto out;
3304
3305 /* create internal TCP socket for CLC handshake and fallback */
3306 smc = smc_sk(sk);
3307 smc->use_fallback = false; /* assume rdma capability first */
3308 smc->fallback_rsn = 0;
3309
3310 /* default behavior from limit_smc_hs in every net namespace */
3311 smc->limit_smc_hs = net->smc.limit_smc_hs;
3312
3313 rc = 0;
3314 if (!clcsock) {
3315 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3316 &smc->clcsock);
3317 if (rc) {
3318 sk_common_release(sk);
3319 goto out;
3320 }
3321
3322 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3323 * destruction; its sk_state might not be TCP_CLOSE after
3324 * smc->sk is close()d, and TCP timers can be fired later,
3325 * which need net ref.
3326 */
3327 sk = smc->clcsock->sk;
3328 __netns_tracker_free(net, &sk->ns_tracker, false);
3329 sk->sk_net_refcnt = 1;
3330 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3331 sock_inuse_add(net, 1);
3332 } else {
3333 smc->clcsock = clcsock;
3334 }
3335
3336 out:
3337 return rc;
3338 }
3339
smc_create(struct net * net,struct socket * sock,int protocol,int kern)3340 static int smc_create(struct net *net, struct socket *sock, int protocol,
3341 int kern)
3342 {
3343 return __smc_create(net, sock, protocol, kern, NULL);
3344 }
3345
3346 static const struct net_proto_family smc_sock_family_ops = {
3347 .family = PF_SMC,
3348 .owner = THIS_MODULE,
3349 .create = smc_create,
3350 };
3351
smc_ulp_init(struct sock * sk)3352 static int smc_ulp_init(struct sock *sk)
3353 {
3354 struct socket *tcp = sk->sk_socket;
3355 struct net *net = sock_net(sk);
3356 struct socket *smcsock;
3357 int protocol, ret;
3358
3359 /* only TCP can be replaced */
3360 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3361 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3362 return -ESOCKTNOSUPPORT;
3363 /* don't handle wq now */
3364 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3365 return -ENOTCONN;
3366
3367 if (sk->sk_family == AF_INET)
3368 protocol = SMCPROTO_SMC;
3369 else
3370 protocol = SMCPROTO_SMC6;
3371
3372 smcsock = sock_alloc();
3373 if (!smcsock)
3374 return -ENFILE;
3375
3376 smcsock->type = SOCK_STREAM;
3377 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3378 ret = __smc_create(net, smcsock, protocol, 1, tcp);
3379 if (ret) {
3380 sock_release(smcsock); /* module_put() which ops won't be NULL */
3381 return ret;
3382 }
3383
3384 /* replace tcp socket to smc */
3385 smcsock->file = tcp->file;
3386 smcsock->file->private_data = smcsock;
3387 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3388 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3389 tcp->file = NULL;
3390
3391 return ret;
3392 }
3393
smc_ulp_clone(const struct request_sock * req,struct sock * newsk,const gfp_t priority)3394 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3395 const gfp_t priority)
3396 {
3397 struct inet_connection_sock *icsk = inet_csk(newsk);
3398
3399 /* don't inherit ulp ops to child when listen */
3400 icsk->icsk_ulp_ops = NULL;
3401 }
3402
3403 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3404 .name = "smc",
3405 .owner = THIS_MODULE,
3406 .init = smc_ulp_init,
3407 .clone = smc_ulp_clone,
3408 };
3409
3410 unsigned int smc_net_id;
3411
smc_net_init(struct net * net)3412 static __net_init int smc_net_init(struct net *net)
3413 {
3414 int rc;
3415
3416 rc = smc_sysctl_net_init(net);
3417 if (rc)
3418 return rc;
3419 return smc_pnet_net_init(net);
3420 }
3421
smc_net_exit(struct net * net)3422 static void __net_exit smc_net_exit(struct net *net)
3423 {
3424 smc_sysctl_net_exit(net);
3425 smc_pnet_net_exit(net);
3426 }
3427
smc_net_stat_init(struct net * net)3428 static __net_init int smc_net_stat_init(struct net *net)
3429 {
3430 return smc_stats_init(net);
3431 }
3432
smc_net_stat_exit(struct net * net)3433 static void __net_exit smc_net_stat_exit(struct net *net)
3434 {
3435 smc_stats_exit(net);
3436 }
3437
3438 static struct pernet_operations smc_net_ops = {
3439 .init = smc_net_init,
3440 .exit = smc_net_exit,
3441 .id = &smc_net_id,
3442 .size = sizeof(struct smc_net),
3443 };
3444
3445 static struct pernet_operations smc_net_stat_ops = {
3446 .init = smc_net_stat_init,
3447 .exit = smc_net_stat_exit,
3448 };
3449
smc_init(void)3450 static int __init smc_init(void)
3451 {
3452 int rc;
3453
3454 rc = register_pernet_subsys(&smc_net_ops);
3455 if (rc)
3456 return rc;
3457
3458 rc = register_pernet_subsys(&smc_net_stat_ops);
3459 if (rc)
3460 goto out_pernet_subsys;
3461
3462 rc = smc_ism_init();
3463 if (rc)
3464 goto out_pernet_subsys_stat;
3465 smc_clc_init();
3466
3467 rc = smc_nl_init();
3468 if (rc)
3469 goto out_ism;
3470
3471 rc = smc_pnet_init();
3472 if (rc)
3473 goto out_nl;
3474
3475 rc = -ENOMEM;
3476
3477 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3478 if (!smc_tcp_ls_wq)
3479 goto out_pnet;
3480
3481 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3482 if (!smc_hs_wq)
3483 goto out_alloc_tcp_ls_wq;
3484
3485 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3486 if (!smc_close_wq)
3487 goto out_alloc_hs_wq;
3488
3489 rc = smc_core_init();
3490 if (rc) {
3491 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3492 goto out_alloc_wqs;
3493 }
3494
3495 rc = smc_llc_init();
3496 if (rc) {
3497 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3498 goto out_core;
3499 }
3500
3501 rc = smc_cdc_init();
3502 if (rc) {
3503 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3504 goto out_core;
3505 }
3506
3507 rc = proto_register(&smc_proto, 1);
3508 if (rc) {
3509 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3510 goto out_core;
3511 }
3512
3513 rc = proto_register(&smc_proto6, 1);
3514 if (rc) {
3515 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3516 goto out_proto;
3517 }
3518
3519 rc = sock_register(&smc_sock_family_ops);
3520 if (rc) {
3521 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3522 goto out_proto6;
3523 }
3524 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3525 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3526
3527 rc = smc_ib_register_client();
3528 if (rc) {
3529 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3530 goto out_sock;
3531 }
3532
3533 rc = tcp_register_ulp(&smc_ulp_ops);
3534 if (rc) {
3535 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3536 goto out_ib;
3537 }
3538
3539 static_branch_enable(&tcp_have_smc);
3540 return 0;
3541
3542 out_ib:
3543 smc_ib_unregister_client();
3544 out_sock:
3545 sock_unregister(PF_SMC);
3546 out_proto6:
3547 proto_unregister(&smc_proto6);
3548 out_proto:
3549 proto_unregister(&smc_proto);
3550 out_core:
3551 smc_core_exit();
3552 out_alloc_wqs:
3553 destroy_workqueue(smc_close_wq);
3554 out_alloc_hs_wq:
3555 destroy_workqueue(smc_hs_wq);
3556 out_alloc_tcp_ls_wq:
3557 destroy_workqueue(smc_tcp_ls_wq);
3558 out_pnet:
3559 smc_pnet_exit();
3560 out_nl:
3561 smc_nl_exit();
3562 out_ism:
3563 smc_clc_exit();
3564 smc_ism_exit();
3565 out_pernet_subsys_stat:
3566 unregister_pernet_subsys(&smc_net_stat_ops);
3567 out_pernet_subsys:
3568 unregister_pernet_subsys(&smc_net_ops);
3569
3570 return rc;
3571 }
3572
smc_exit(void)3573 static void __exit smc_exit(void)
3574 {
3575 static_branch_disable(&tcp_have_smc);
3576 tcp_unregister_ulp(&smc_ulp_ops);
3577 sock_unregister(PF_SMC);
3578 smc_core_exit();
3579 smc_ib_unregister_client();
3580 smc_ism_exit();
3581 destroy_workqueue(smc_close_wq);
3582 destroy_workqueue(smc_tcp_ls_wq);
3583 destroy_workqueue(smc_hs_wq);
3584 proto_unregister(&smc_proto6);
3585 proto_unregister(&smc_proto);
3586 smc_pnet_exit();
3587 smc_nl_exit();
3588 smc_clc_exit();
3589 unregister_pernet_subsys(&smc_net_stat_ops);
3590 unregister_pernet_subsys(&smc_net_ops);
3591 rcu_barrier();
3592 }
3593
3594 module_init(smc_init);
3595 module_exit(smc_exit);
3596
3597 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3598 MODULE_DESCRIPTION("smc socket address family");
3599 MODULE_LICENSE("GPL");
3600 MODULE_ALIAS_NETPROTO(PF_SMC);
3601 MODULE_ALIAS_TCP_ULP("smc");
3602 MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);
3603
