1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * AF_SMC protocol family socket handler keeping the AF_INET sock address type
6 * applies to SOCK_STREAM sockets only
7 * offers an alternative communication option for TCP-protocol sockets
8 * applicable with RoCE-cards only
9 *
10 * Initial restrictions:
11 * - support for alternate links postponed
12 *
13 * Copyright IBM Corp. 2016, 2018
14 *
15 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
16 * based on prototype from Frank Blaschka
17 */
18
19 #define KMSG_COMPONENT "smc"
20 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
21
22 #include <linux/module.h>
23 #include <linux/socket.h>
24 #include <linux/workqueue.h>
25 #include <linux/in.h>
26 #include <linux/sched/signal.h>
27 #include <linux/if_vlan.h>
28 #include <linux/rcupdate_wait.h>
29 #include <linux/ctype.h>
30
31 #include <net/sock.h>
32 #include <net/tcp.h>
33 #include <net/smc.h>
34 #include <asm/ioctls.h>
35
36 #include <net/net_namespace.h>
37 #include <net/netns/generic.h>
38 #include "smc_netns.h"
39
40 #include "smc.h"
41 #include "smc_clc.h"
42 #include "smc_llc.h"
43 #include "smc_cdc.h"
44 #include "smc_core.h"
45 #include "smc_ib.h"
46 #include "smc_ism.h"
47 #include "smc_pnet.h"
48 #include "smc_netlink.h"
49 #include "smc_tx.h"
50 #include "smc_rx.h"
51 #include "smc_close.h"
52 #include "smc_stats.h"
53 #include "smc_tracepoint.h"
54 #include "smc_sysctl.h"
55
56 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
57 * creation on server
58 */
59 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
60 * creation on client
61 */
62
63 static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */
64 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
65 struct workqueue_struct *smc_close_wq; /* wq for close work */
66
67 static void smc_tcp_listen_work(struct work_struct *);
68 static void smc_connect_work(struct work_struct *);
69
smc_nl_dump_hs_limitation(struct sk_buff * skb,struct netlink_callback * cb)70 int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
71 {
72 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
73 void *hdr;
74
75 if (cb_ctx->pos[0])
76 goto out;
77
78 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
79 &smc_gen_nl_family, NLM_F_MULTI,
80 SMC_NETLINK_DUMP_HS_LIMITATION);
81 if (!hdr)
82 return -ENOMEM;
83
84 if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
85 sock_net(skb->sk)->smc.limit_smc_hs))
86 goto err;
87
88 genlmsg_end(skb, hdr);
89 cb_ctx->pos[0] = 1;
90 out:
91 return skb->len;
92 err:
93 genlmsg_cancel(skb, hdr);
94 return -EMSGSIZE;
95 }
96
smc_nl_enable_hs_limitation(struct sk_buff * skb,struct genl_info * info)97 int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
98 {
99 sock_net(skb->sk)->smc.limit_smc_hs = true;
100 return 0;
101 }
102
smc_nl_disable_hs_limitation(struct sk_buff * skb,struct genl_info * info)103 int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
104 {
105 sock_net(skb->sk)->smc.limit_smc_hs = false;
106 return 0;
107 }
108
smc_set_keepalive(struct sock * sk,int val)109 static void smc_set_keepalive(struct sock *sk, int val)
110 {
111 struct smc_sock *smc = smc_sk(sk);
112
113 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
114 }
115
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)116 static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
117 struct sk_buff *skb,
118 struct request_sock *req,
119 struct dst_entry *dst,
120 struct request_sock *req_unhash,
121 bool *own_req)
122 {
123 struct smc_sock *smc;
124 struct sock *child;
125
126 smc = smc_clcsock_user_data(sk);
127
128 if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
129 sk->sk_max_ack_backlog)
130 goto drop;
131
132 if (sk_acceptq_is_full(&smc->sk)) {
133 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
134 goto drop;
135 }
136
137 /* passthrough to original syn recv sock fct */
138 child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
139 own_req);
140 /* child must not inherit smc or its ops */
141 if (child) {
142 rcu_assign_sk_user_data(child, NULL);
143
144 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
145 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
146 inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
147 }
148 return child;
149
150 drop:
151 dst_release(dst);
152 tcp_listendrop(sk);
153 return NULL;
154 }
155
smc_hs_congested(const struct sock * sk)156 static bool smc_hs_congested(const struct sock *sk)
157 {
158 const struct smc_sock *smc;
159
160 smc = smc_clcsock_user_data(sk);
161
162 if (!smc)
163 return true;
164
165 if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
166 return true;
167
168 return false;
169 }
170
171 static struct smc_hashinfo smc_v4_hashinfo = {
172 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
173 };
174
175 static struct smc_hashinfo smc_v6_hashinfo = {
176 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
177 };
178
smc_hash_sk(struct sock * sk)179 int smc_hash_sk(struct sock *sk)
180 {
181 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
182 struct hlist_head *head;
183
184 head = &h->ht;
185
186 write_lock_bh(&h->lock);
187 sk_add_node(sk, head);
188 write_unlock_bh(&h->lock);
189 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
190
191 return 0;
192 }
193 EXPORT_SYMBOL_GPL(smc_hash_sk);
194
smc_unhash_sk(struct sock * sk)195 void smc_unhash_sk(struct sock *sk)
196 {
197 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
198
199 write_lock_bh(&h->lock);
200 if (sk_del_node_init(sk))
201 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
202 write_unlock_bh(&h->lock);
203 }
204 EXPORT_SYMBOL_GPL(smc_unhash_sk);
205
206 /* This will be called before user really release sock_lock. So do the
207 * work which we didn't do because of user hold the sock_lock in the
208 * BH context
209 */
smc_release_cb(struct sock * sk)210 static void smc_release_cb(struct sock *sk)
211 {
212 struct smc_sock *smc = smc_sk(sk);
213
214 if (smc->conn.tx_in_release_sock) {
215 smc_tx_pending(&smc->conn);
216 smc->conn.tx_in_release_sock = false;
217 }
218 }
219
220 struct proto smc_proto = {
221 .name = "SMC",
222 .owner = THIS_MODULE,
223 .keepalive = smc_set_keepalive,
224 .hash = smc_hash_sk,
225 .unhash = smc_unhash_sk,
226 .release_cb = smc_release_cb,
227 .obj_size = sizeof(struct smc_sock),
228 .h.smc_hash = &smc_v4_hashinfo,
229 .slab_flags = SLAB_TYPESAFE_BY_RCU,
230 };
231 EXPORT_SYMBOL_GPL(smc_proto);
232
233 struct proto smc_proto6 = {
234 .name = "SMC6",
235 .owner = THIS_MODULE,
236 .keepalive = smc_set_keepalive,
237 .hash = smc_hash_sk,
238 .unhash = smc_unhash_sk,
239 .release_cb = smc_release_cb,
240 .obj_size = sizeof(struct smc_sock),
241 .h.smc_hash = &smc_v6_hashinfo,
242 .slab_flags = SLAB_TYPESAFE_BY_RCU,
243 };
244 EXPORT_SYMBOL_GPL(smc_proto6);
245
smc_fback_restore_callbacks(struct smc_sock * smc)246 static void smc_fback_restore_callbacks(struct smc_sock *smc)
247 {
248 struct sock *clcsk = smc->clcsock->sk;
249
250 write_lock_bh(&clcsk->sk_callback_lock);
251 clcsk->sk_user_data = NULL;
252
253 smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
254 smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
255 smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
256 smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
257
258 write_unlock_bh(&clcsk->sk_callback_lock);
259 }
260
smc_restore_fallback_changes(struct smc_sock * smc)261 static void smc_restore_fallback_changes(struct smc_sock *smc)
262 {
263 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
264 smc->clcsock->file->private_data = smc->sk.sk_socket;
265 smc->clcsock->file = NULL;
266 smc_fback_restore_callbacks(smc);
267 }
268 }
269
__smc_release(struct smc_sock * smc)270 static int __smc_release(struct smc_sock *smc)
271 {
272 struct sock *sk = &smc->sk;
273 int rc = 0;
274
275 if (!smc->use_fallback) {
276 rc = smc_close_active(smc);
277 sock_set_flag(sk, SOCK_DEAD);
278 sk->sk_shutdown |= SHUTDOWN_MASK;
279 } else {
280 if (sk->sk_state != SMC_CLOSED) {
281 if (sk->sk_state != SMC_LISTEN &&
282 sk->sk_state != SMC_INIT)
283 sock_put(sk); /* passive closing */
284 if (sk->sk_state == SMC_LISTEN) {
285 /* wake up clcsock accept */
286 rc = kernel_sock_shutdown(smc->clcsock,
287 SHUT_RDWR);
288 }
289 sk->sk_state = SMC_CLOSED;
290 sk->sk_state_change(sk);
291 }
292 smc_restore_fallback_changes(smc);
293 }
294
295 sk->sk_prot->unhash(sk);
296
297 if (sk->sk_state == SMC_CLOSED) {
298 if (smc->clcsock) {
299 release_sock(sk);
300 smc_clcsock_release(smc);
301 lock_sock(sk);
302 }
303 if (!smc->use_fallback)
304 smc_conn_free(&smc->conn);
305 }
306
307 return rc;
308 }
309
smc_release(struct socket * sock)310 static int smc_release(struct socket *sock)
311 {
312 struct sock *sk = sock->sk;
313 struct smc_sock *smc;
314 int old_state, rc = 0;
315
316 if (!sk)
317 goto out;
318
319 sock_hold(sk); /* sock_put below */
320 smc = smc_sk(sk);
321
322 old_state = sk->sk_state;
323
324 /* cleanup for a dangling non-blocking connect */
325 if (smc->connect_nonblock && old_state == SMC_INIT)
326 tcp_abort(smc->clcsock->sk, ECONNABORTED);
327
328 if (cancel_work_sync(&smc->connect_work))
329 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
330
331 if (sk->sk_state == SMC_LISTEN)
332 /* smc_close_non_accepted() is called and acquires
333 * sock lock for child sockets again
334 */
335 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
336 else
337 lock_sock(sk);
338
339 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
340 !smc->use_fallback)
341 smc_close_active_abort(smc);
342
343 rc = __smc_release(smc);
344
345 /* detach socket */
346 sock_orphan(sk);
347 sock->sk = NULL;
348 release_sock(sk);
349
350 sock_put(sk); /* sock_hold above */
351 sock_put(sk); /* final sock_put */
352 out:
353 return rc;
354 }
355
smc_destruct(struct sock * sk)356 static void smc_destruct(struct sock *sk)
357 {
358 if (sk->sk_state != SMC_CLOSED)
359 return;
360 if (!sock_flag(sk, SOCK_DEAD))
361 return;
362
363 sk_refcnt_debug_dec(sk);
364 }
365
smc_sock_alloc(struct net * net,struct socket * sock,int protocol)366 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
367 int protocol)
368 {
369 struct smc_sock *smc;
370 struct proto *prot;
371 struct sock *sk;
372
373 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
374 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
375 if (!sk)
376 return NULL;
377
378 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
379 sk->sk_state = SMC_INIT;
380 sk->sk_destruct = smc_destruct;
381 sk->sk_protocol = protocol;
382 smc = smc_sk(sk);
383 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
384 INIT_WORK(&smc->connect_work, smc_connect_work);
385 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
386 INIT_LIST_HEAD(&smc->accept_q);
387 spin_lock_init(&smc->accept_q_lock);
388 spin_lock_init(&smc->conn.send_lock);
389 sk->sk_prot->hash(sk);
390 sk_refcnt_debug_inc(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 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
431
432 out_rel:
433 release_sock(sk);
434 out:
435 return rc;
436 }
437
smc_copy_sock_settings(struct sock * nsk,struct sock * osk,unsigned long mask)438 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
439 unsigned long mask)
440 {
441 /* options we don't get control via setsockopt for */
442 nsk->sk_type = osk->sk_type;
443 nsk->sk_sndbuf = osk->sk_sndbuf;
444 nsk->sk_rcvbuf = osk->sk_rcvbuf;
445 nsk->sk_sndtimeo = osk->sk_sndtimeo;
446 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
447 nsk->sk_mark = osk->sk_mark;
448 nsk->sk_priority = osk->sk_priority;
449 nsk->sk_rcvlowat = osk->sk_rcvlowat;
450 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
451 nsk->sk_err = osk->sk_err;
452
453 nsk->sk_flags &= ~mask;
454 nsk->sk_flags |= osk->sk_flags & mask;
455 }
456
457 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
458 (1UL << SOCK_KEEPOPEN) | \
459 (1UL << SOCK_LINGER) | \
460 (1UL << SOCK_BROADCAST) | \
461 (1UL << SOCK_TIMESTAMP) | \
462 (1UL << SOCK_DBG) | \
463 (1UL << SOCK_RCVTSTAMP) | \
464 (1UL << SOCK_RCVTSTAMPNS) | \
465 (1UL << SOCK_LOCALROUTE) | \
466 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
467 (1UL << SOCK_RXQ_OVFL) | \
468 (1UL << SOCK_WIFI_STATUS) | \
469 (1UL << SOCK_NOFCS) | \
470 (1UL << SOCK_FILTER_LOCKED) | \
471 (1UL << SOCK_TSTAMP_NEW))
472 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
473 * clc socket (since smc is not called for these options from net/core)
474 */
smc_copy_sock_settings_to_clc(struct smc_sock * smc)475 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
476 {
477 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
478 }
479
480 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
481 (1UL << SOCK_KEEPOPEN) | \
482 (1UL << SOCK_LINGER) | \
483 (1UL << SOCK_DBG))
484 /* copy only settings and flags relevant for smc from clc to smc socket */
smc_copy_sock_settings_to_smc(struct smc_sock * smc)485 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
486 {
487 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
488 }
489
490 /* register the new rmb on all links */
smcr_lgr_reg_rmbs(struct smc_link * link,struct smc_buf_desc * rmb_desc)491 static int smcr_lgr_reg_rmbs(struct smc_link *link,
492 struct smc_buf_desc *rmb_desc)
493 {
494 struct smc_link_group *lgr = link->lgr;
495 int i, rc = 0;
496
497 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
498 if (rc)
499 return rc;
500 /* protect against parallel smc_llc_cli_rkey_exchange() and
501 * parallel smcr_link_reg_rmb()
502 */
503 mutex_lock(&lgr->llc_conf_mutex);
504 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
505 if (!smc_link_active(&lgr->lnk[i]))
506 continue;
507 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
508 if (rc)
509 goto out;
510 }
511
512 /* exchange confirm_rkey msg with peer */
513 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
514 if (rc) {
515 rc = -EFAULT;
516 goto out;
517 }
518 rmb_desc->is_conf_rkey = true;
519 out:
520 mutex_unlock(&lgr->llc_conf_mutex);
521 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
522 return rc;
523 }
524
smcr_clnt_conf_first_link(struct smc_sock * smc)525 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
526 {
527 struct smc_link *link = smc->conn.lnk;
528 struct smc_llc_qentry *qentry;
529 int rc;
530
531 /* receive CONFIRM LINK request from server over RoCE fabric */
532 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
533 SMC_LLC_CONFIRM_LINK);
534 if (!qentry) {
535 struct smc_clc_msg_decline dclc;
536
537 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
538 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
539 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
540 }
541 smc_llc_save_peer_uid(qentry);
542 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
543 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
544 if (rc)
545 return SMC_CLC_DECL_RMBE_EC;
546
547 rc = smc_ib_modify_qp_rts(link);
548 if (rc)
549 return SMC_CLC_DECL_ERR_RDYLNK;
550
551 smc_wr_remember_qp_attr(link);
552
553 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
554 return SMC_CLC_DECL_ERR_REGRMB;
555
556 /* confirm_rkey is implicit on 1st contact */
557 smc->conn.rmb_desc->is_conf_rkey = true;
558
559 /* send CONFIRM LINK response over RoCE fabric */
560 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
561 if (rc < 0)
562 return SMC_CLC_DECL_TIMEOUT_CL;
563
564 smc_llc_link_active(link);
565 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
566
567 /* optional 2nd link, receive ADD LINK request from server */
568 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
569 SMC_LLC_ADD_LINK);
570 if (!qentry) {
571 struct smc_clc_msg_decline dclc;
572
573 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
574 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
575 if (rc == -EAGAIN)
576 rc = 0; /* no DECLINE received, go with one link */
577 return rc;
578 }
579 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
580 smc_llc_cli_add_link(link, qentry);
581 return 0;
582 }
583
smc_isascii(char * hostname)584 static bool smc_isascii(char *hostname)
585 {
586 int i;
587
588 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
589 if (!isascii(hostname[i]))
590 return false;
591 return true;
592 }
593
smc_conn_save_peer_info_fce(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)594 static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
595 struct smc_clc_msg_accept_confirm *clc)
596 {
597 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
598 (struct smc_clc_msg_accept_confirm_v2 *)clc;
599 struct smc_clc_first_contact_ext *fce;
600 int clc_v2_len;
601
602 if (clc->hdr.version == SMC_V1 ||
603 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
604 return;
605
606 if (smc->conn.lgr->is_smcd) {
607 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
608 SMC_MAX_EID_LEN);
609 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
610 d1);
611 } else {
612 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
613 SMC_MAX_EID_LEN);
614 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
615 r1);
616 }
617 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
618 smc->conn.lgr->peer_os = fce->os_type;
619 smc->conn.lgr->peer_smc_release = fce->release;
620 if (smc_isascii(fce->hostname))
621 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
622 SMC_MAX_HOSTNAME_LEN);
623 }
624
smcr_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)625 static void smcr_conn_save_peer_info(struct smc_sock *smc,
626 struct smc_clc_msg_accept_confirm *clc)
627 {
628 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
629
630 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
631 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
632 smc->conn.peer_rmbe_size = bufsize;
633 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
634 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
635 }
636
smcd_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)637 static void smcd_conn_save_peer_info(struct smc_sock *smc,
638 struct smc_clc_msg_accept_confirm *clc)
639 {
640 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
641
642 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
643 smc->conn.peer_token = clc->d0.token;
644 /* msg header takes up space in the buffer */
645 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
646 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
647 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
648 }
649
smc_conn_save_peer_info(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * clc)650 static void smc_conn_save_peer_info(struct smc_sock *smc,
651 struct smc_clc_msg_accept_confirm *clc)
652 {
653 if (smc->conn.lgr->is_smcd)
654 smcd_conn_save_peer_info(smc, clc);
655 else
656 smcr_conn_save_peer_info(smc, clc);
657 smc_conn_save_peer_info_fce(smc, clc);
658 }
659
smc_link_save_peer_info(struct smc_link * link,struct smc_clc_msg_accept_confirm * clc,struct smc_init_info * ini)660 static void smc_link_save_peer_info(struct smc_link *link,
661 struct smc_clc_msg_accept_confirm *clc,
662 struct smc_init_info *ini)
663 {
664 link->peer_qpn = ntoh24(clc->r0.qpn);
665 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
666 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
667 link->peer_psn = ntoh24(clc->r0.psn);
668 link->peer_mtu = clc->r0.qp_mtu;
669 }
670
smc_stat_inc_fback_rsn_cnt(struct smc_sock * smc,struct smc_stats_fback * fback_arr)671 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
672 struct smc_stats_fback *fback_arr)
673 {
674 int cnt;
675
676 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
677 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
678 fback_arr[cnt].count++;
679 break;
680 }
681 if (!fback_arr[cnt].fback_code) {
682 fback_arr[cnt].fback_code = smc->fallback_rsn;
683 fback_arr[cnt].count++;
684 break;
685 }
686 }
687 }
688
smc_stat_fallback(struct smc_sock * smc)689 static void smc_stat_fallback(struct smc_sock *smc)
690 {
691 struct net *net = sock_net(&smc->sk);
692
693 mutex_lock(&net->smc.mutex_fback_rsn);
694 if (smc->listen_smc) {
695 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
696 net->smc.fback_rsn->srv_fback_cnt++;
697 } else {
698 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
699 net->smc.fback_rsn->clnt_fback_cnt++;
700 }
701 mutex_unlock(&net->smc.mutex_fback_rsn);
702 }
703
704 /* must be called under rcu read lock */
smc_fback_wakeup_waitqueue(struct smc_sock * smc,void * key)705 static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
706 {
707 struct socket_wq *wq;
708 __poll_t flags;
709
710 wq = rcu_dereference(smc->sk.sk_wq);
711 if (!skwq_has_sleeper(wq))
712 return;
713
714 /* wake up smc sk->sk_wq */
715 if (!key) {
716 /* sk_state_change */
717 wake_up_interruptible_all(&wq->wait);
718 } else {
719 flags = key_to_poll(key);
720 if (flags & (EPOLLIN | EPOLLOUT))
721 /* sk_data_ready or sk_write_space */
722 wake_up_interruptible_sync_poll(&wq->wait, flags);
723 else if (flags & EPOLLERR)
724 /* sk_error_report */
725 wake_up_interruptible_poll(&wq->wait, flags);
726 }
727 }
728
smc_fback_mark_woken(wait_queue_entry_t * wait,unsigned int mode,int sync,void * key)729 static int smc_fback_mark_woken(wait_queue_entry_t *wait,
730 unsigned int mode, int sync, void *key)
731 {
732 struct smc_mark_woken *mark =
733 container_of(wait, struct smc_mark_woken, wait_entry);
734
735 mark->woken = true;
736 mark->key = key;
737 return 0;
738 }
739
smc_fback_forward_wakeup(struct smc_sock * smc,struct sock * clcsk,void (* clcsock_callback)(struct sock * sk))740 static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
741 void (*clcsock_callback)(struct sock *sk))
742 {
743 struct smc_mark_woken mark = { .woken = false };
744 struct socket_wq *wq;
745
746 init_waitqueue_func_entry(&mark.wait_entry,
747 smc_fback_mark_woken);
748 rcu_read_lock();
749 wq = rcu_dereference(clcsk->sk_wq);
750 if (!wq)
751 goto out;
752 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
753 clcsock_callback(clcsk);
754 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
755
756 if (mark.woken)
757 smc_fback_wakeup_waitqueue(smc, mark.key);
758 out:
759 rcu_read_unlock();
760 }
761
smc_fback_state_change(struct sock * clcsk)762 static void smc_fback_state_change(struct sock *clcsk)
763 {
764 struct smc_sock *smc;
765
766 read_lock_bh(&clcsk->sk_callback_lock);
767 smc = smc_clcsock_user_data(clcsk);
768 if (smc)
769 smc_fback_forward_wakeup(smc, clcsk,
770 smc->clcsk_state_change);
771 read_unlock_bh(&clcsk->sk_callback_lock);
772 }
773
smc_fback_data_ready(struct sock * clcsk)774 static void smc_fback_data_ready(struct sock *clcsk)
775 {
776 struct smc_sock *smc;
777
778 read_lock_bh(&clcsk->sk_callback_lock);
779 smc = smc_clcsock_user_data(clcsk);
780 if (smc)
781 smc_fback_forward_wakeup(smc, clcsk,
782 smc->clcsk_data_ready);
783 read_unlock_bh(&clcsk->sk_callback_lock);
784 }
785
smc_fback_write_space(struct sock * clcsk)786 static void smc_fback_write_space(struct sock *clcsk)
787 {
788 struct smc_sock *smc;
789
790 read_lock_bh(&clcsk->sk_callback_lock);
791 smc = smc_clcsock_user_data(clcsk);
792 if (smc)
793 smc_fback_forward_wakeup(smc, clcsk,
794 smc->clcsk_write_space);
795 read_unlock_bh(&clcsk->sk_callback_lock);
796 }
797
smc_fback_error_report(struct sock * clcsk)798 static void smc_fback_error_report(struct sock *clcsk)
799 {
800 struct smc_sock *smc;
801
802 read_lock_bh(&clcsk->sk_callback_lock);
803 smc = smc_clcsock_user_data(clcsk);
804 if (smc)
805 smc_fback_forward_wakeup(smc, clcsk,
806 smc->clcsk_error_report);
807 read_unlock_bh(&clcsk->sk_callback_lock);
808 }
809
smc_fback_replace_callbacks(struct smc_sock * smc)810 static void smc_fback_replace_callbacks(struct smc_sock *smc)
811 {
812 struct sock *clcsk = smc->clcsock->sk;
813
814 write_lock_bh(&clcsk->sk_callback_lock);
815 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
816
817 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
818 &smc->clcsk_state_change);
819 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
820 &smc->clcsk_data_ready);
821 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
822 &smc->clcsk_write_space);
823 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
824 &smc->clcsk_error_report);
825
826 write_unlock_bh(&clcsk->sk_callback_lock);
827 }
828
smc_switch_to_fallback(struct smc_sock * smc,int reason_code)829 static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
830 {
831 int rc = 0;
832
833 mutex_lock(&smc->clcsock_release_lock);
834 if (!smc->clcsock) {
835 rc = -EBADF;
836 goto out;
837 }
838
839 smc->use_fallback = true;
840 smc->fallback_rsn = reason_code;
841 smc_stat_fallback(smc);
842 trace_smc_switch_to_fallback(smc, reason_code);
843 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
844 smc->clcsock->file = smc->sk.sk_socket->file;
845 smc->clcsock->file->private_data = smc->clcsock;
846 smc->clcsock->wq.fasync_list =
847 smc->sk.sk_socket->wq.fasync_list;
848
849 /* There might be some wait entries remaining
850 * in smc sk->sk_wq and they should be woken up
851 * as clcsock's wait queue is woken up.
852 */
853 smc_fback_replace_callbacks(smc);
854 }
855 out:
856 mutex_unlock(&smc->clcsock_release_lock);
857 return rc;
858 }
859
860 /* fall back during connect */
smc_connect_fallback(struct smc_sock * smc,int reason_code)861 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
862 {
863 struct net *net = sock_net(&smc->sk);
864 int rc = 0;
865
866 rc = smc_switch_to_fallback(smc, reason_code);
867 if (rc) { /* fallback fails */
868 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
869 if (smc->sk.sk_state == SMC_INIT)
870 sock_put(&smc->sk); /* passive closing */
871 return rc;
872 }
873 smc_copy_sock_settings_to_clc(smc);
874 smc->connect_nonblock = 0;
875 if (smc->sk.sk_state == SMC_INIT)
876 smc->sk.sk_state = SMC_ACTIVE;
877 return 0;
878 }
879
880 /* decline and fall back during connect */
smc_connect_decline_fallback(struct smc_sock * smc,int reason_code,u8 version)881 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
882 u8 version)
883 {
884 struct net *net = sock_net(&smc->sk);
885 int rc;
886
887 if (reason_code < 0) { /* error, fallback is not possible */
888 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
889 if (smc->sk.sk_state == SMC_INIT)
890 sock_put(&smc->sk); /* passive closing */
891 return reason_code;
892 }
893 if (reason_code != SMC_CLC_DECL_PEERDECL) {
894 rc = smc_clc_send_decline(smc, reason_code, version);
895 if (rc < 0) {
896 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
897 if (smc->sk.sk_state == SMC_INIT)
898 sock_put(&smc->sk); /* passive closing */
899 return rc;
900 }
901 }
902 return smc_connect_fallback(smc, reason_code);
903 }
904
smc_conn_abort(struct smc_sock * smc,int local_first)905 static void smc_conn_abort(struct smc_sock *smc, int local_first)
906 {
907 struct smc_connection *conn = &smc->conn;
908 struct smc_link_group *lgr = conn->lgr;
909 bool lgr_valid = false;
910
911 if (smc_conn_lgr_valid(conn))
912 lgr_valid = true;
913
914 smc_conn_free(conn);
915 if (local_first && lgr_valid)
916 smc_lgr_cleanup_early(lgr);
917 }
918
919 /* check if there is a rdma device available for this connection. */
920 /* called for connect and listen */
smc_find_rdma_device(struct smc_sock * smc,struct smc_init_info * ini)921 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
922 {
923 /* PNET table look up: search active ib_device and port
924 * within same PNETID that also contains the ethernet device
925 * used for the internal TCP socket
926 */
927 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
928 if (!ini->check_smcrv2 && !ini->ib_dev)
929 return SMC_CLC_DECL_NOSMCRDEV;
930 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
931 return SMC_CLC_DECL_NOSMCRDEV;
932 return 0;
933 }
934
935 /* check if there is an ISM device available for this connection. */
936 /* called for connect and listen */
smc_find_ism_device(struct smc_sock * smc,struct smc_init_info * ini)937 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
938 {
939 /* Find ISM device with same PNETID as connecting interface */
940 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
941 if (!ini->ism_dev[0])
942 return SMC_CLC_DECL_NOSMCDDEV;
943 else
944 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
945 return 0;
946 }
947
948 /* 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)949 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
950 int cnt)
951 {
952 int i = (!ini->ism_dev[0]) ? 1 : 0;
953
954 for (; i < cnt; i++)
955 if (ini->ism_chid[i] == chid)
956 return false;
957 return true;
958 }
959
960 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
961 * PNETID matching net_device)
962 */
smc_find_ism_v2_device_clnt(struct smc_sock * smc,struct smc_init_info * ini)963 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
964 struct smc_init_info *ini)
965 {
966 int rc = SMC_CLC_DECL_NOSMCDDEV;
967 struct smcd_dev *smcd;
968 int i = 1;
969 u16 chid;
970
971 if (smcd_indicated(ini->smc_type_v1))
972 rc = 0; /* already initialized for V1 */
973 mutex_lock(&smcd_dev_list.mutex);
974 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
975 if (smcd->going_away || smcd == ini->ism_dev[0])
976 continue;
977 chid = smc_ism_get_chid(smcd);
978 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
979 continue;
980 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
981 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
982 ini->ism_dev[i] = smcd;
983 ini->ism_chid[i] = chid;
984 ini->is_smcd = true;
985 rc = 0;
986 i++;
987 if (i > SMC_MAX_ISM_DEVS)
988 break;
989 }
990 }
991 mutex_unlock(&smcd_dev_list.mutex);
992 ini->ism_offered_cnt = i - 1;
993 if (!ini->ism_dev[0] && !ini->ism_dev[1])
994 ini->smcd_version = 0;
995
996 return rc;
997 }
998
999 /* 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)1000 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
1001 struct smc_init_info *ini)
1002 {
1003 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
1004 return SMC_CLC_DECL_ISMVLANERR;
1005 return 0;
1006 }
1007
smc_find_proposal_devices(struct smc_sock * smc,struct smc_init_info * ini)1008 static int smc_find_proposal_devices(struct smc_sock *smc,
1009 struct smc_init_info *ini)
1010 {
1011 int rc = 0;
1012
1013 /* check if there is an ism device available */
1014 if (!(ini->smcd_version & SMC_V1) ||
1015 smc_find_ism_device(smc, ini) ||
1016 smc_connect_ism_vlan_setup(smc, ini))
1017 ini->smcd_version &= ~SMC_V1;
1018 /* else ISM V1 is supported for this connection */
1019
1020 /* check if there is an rdma device available */
1021 if (!(ini->smcr_version & SMC_V1) ||
1022 smc_find_rdma_device(smc, ini))
1023 ini->smcr_version &= ~SMC_V1;
1024 /* else RDMA is supported for this connection */
1025
1026 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1027 ini->smcr_version & SMC_V1);
1028
1029 /* check if there is an ism v2 device available */
1030 if (!(ini->smcd_version & SMC_V2) ||
1031 !smc_ism_is_v2_capable() ||
1032 smc_find_ism_v2_device_clnt(smc, ini))
1033 ini->smcd_version &= ~SMC_V2;
1034
1035 /* check if there is an rdma v2 device available */
1036 ini->check_smcrv2 = true;
1037 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1038 if (!(ini->smcr_version & SMC_V2) ||
1039 smc->clcsock->sk->sk_family != AF_INET ||
1040 !smc_clc_ueid_count() ||
1041 smc_find_rdma_device(smc, ini))
1042 ini->smcr_version &= ~SMC_V2;
1043 ini->check_smcrv2 = false;
1044
1045 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1046 ini->smcr_version & SMC_V2);
1047
1048 /* if neither ISM nor RDMA are supported, fallback */
1049 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
1050 rc = SMC_CLC_DECL_NOSMCDEV;
1051
1052 return rc;
1053 }
1054
1055 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1056 * used, the VLAN ID will be registered again during the connection setup.
1057 */
smc_connect_ism_vlan_cleanup(struct smc_sock * smc,struct smc_init_info * ini)1058 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
1059 struct smc_init_info *ini)
1060 {
1061 if (!smcd_indicated(ini->smc_type_v1))
1062 return 0;
1063 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
1064 return SMC_CLC_DECL_CNFERR;
1065 return 0;
1066 }
1067
1068 #define SMC_CLC_MAX_ACCEPT_LEN \
1069 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
1070 sizeof(struct smc_clc_first_contact_ext) + \
1071 sizeof(struct smc_clc_msg_trail))
1072
1073 /* CLC handshake during connect */
smc_connect_clc(struct smc_sock * smc,struct smc_clc_msg_accept_confirm_v2 * aclc2,struct smc_init_info * ini)1074 static int smc_connect_clc(struct smc_sock *smc,
1075 struct smc_clc_msg_accept_confirm_v2 *aclc2,
1076 struct smc_init_info *ini)
1077 {
1078 int rc = 0;
1079
1080 /* do inband token exchange */
1081 rc = smc_clc_send_proposal(smc, ini);
1082 if (rc)
1083 return rc;
1084 /* receive SMC Accept CLC message */
1085 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
1086 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
1087 }
1088
smc_fill_gid_list(struct smc_link_group * lgr,struct smc_gidlist * gidlist,struct smc_ib_device * known_dev,u8 * known_gid)1089 void smc_fill_gid_list(struct smc_link_group *lgr,
1090 struct smc_gidlist *gidlist,
1091 struct smc_ib_device *known_dev, u8 *known_gid)
1092 {
1093 struct smc_init_info *alt_ini = NULL;
1094
1095 memset(gidlist, 0, sizeof(*gidlist));
1096 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1097
1098 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1099 if (!alt_ini)
1100 goto out;
1101
1102 alt_ini->vlan_id = lgr->vlan_id;
1103 alt_ini->check_smcrv2 = true;
1104 alt_ini->smcrv2.saddr = lgr->saddr;
1105 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1106
1107 if (!alt_ini->smcrv2.ib_dev_v2)
1108 goto out;
1109
1110 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1111 SMC_GID_SIZE);
1112
1113 out:
1114 kfree(alt_ini);
1115 }
1116
smc_connect_rdma_v2_prepare(struct smc_sock * smc,struct smc_clc_msg_accept_confirm * aclc,struct smc_init_info * ini)1117 static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1118 struct smc_clc_msg_accept_confirm *aclc,
1119 struct smc_init_info *ini)
1120 {
1121 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1122 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1123 struct smc_clc_first_contact_ext *fce =
1124 (struct smc_clc_first_contact_ext *)
1125 (((u8 *)clc_v2) + sizeof(*clc_v2));
1126
1127 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1128 return 0;
1129
1130 if (fce->v2_direct) {
1131 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1132 ini->smcrv2.uses_gateway = false;
1133 } else {
1134 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr,
1135 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1136 ini->smcrv2.nexthop_mac,
1137 &ini->smcrv2.uses_gateway))
1138 return SMC_CLC_DECL_NOROUTE;
1139 if (!ini->smcrv2.uses_gateway) {
1140 /* mismatch: peer claims indirect, but its direct */
1141 return SMC_CLC_DECL_NOINDIRECT;
1142 }
1143 }
1144 return 0;
1145 }
1146
1147 /* 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)1148 static int smc_connect_rdma(struct smc_sock *smc,
1149 struct smc_clc_msg_accept_confirm *aclc,
1150 struct smc_init_info *ini)
1151 {
1152 int i, reason_code = 0;
1153 struct smc_link *link;
1154 u8 *eid = NULL;
1155
1156 ini->is_smcd = false;
1157 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
1158 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1159 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1160 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1161 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1162
1163 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1164 if (reason_code)
1165 return reason_code;
1166
1167 mutex_lock(&smc_client_lgr_pending);
1168 reason_code = smc_conn_create(smc, ini);
1169 if (reason_code) {
1170 mutex_unlock(&smc_client_lgr_pending);
1171 return reason_code;
1172 }
1173
1174 smc_conn_save_peer_info(smc, aclc);
1175
1176 if (ini->first_contact_local) {
1177 link = smc->conn.lnk;
1178 } else {
1179 /* set link that was assigned by server */
1180 link = NULL;
1181 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1182 struct smc_link *l = &smc->conn.lgr->lnk[i];
1183
1184 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1185 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1186 SMC_GID_SIZE) &&
1187 (aclc->hdr.version > SMC_V1 ||
1188 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1189 sizeof(l->peer_mac)))) {
1190 link = l;
1191 break;
1192 }
1193 }
1194 if (!link) {
1195 reason_code = SMC_CLC_DECL_NOSRVLINK;
1196 goto connect_abort;
1197 }
1198 smc_switch_link_and_count(&smc->conn, link);
1199 }
1200
1201 /* create send buffer and rmb */
1202 if (smc_buf_create(smc, false)) {
1203 reason_code = SMC_CLC_DECL_MEM;
1204 goto connect_abort;
1205 }
1206
1207 if (ini->first_contact_local)
1208 smc_link_save_peer_info(link, aclc, ini);
1209
1210 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1211 reason_code = SMC_CLC_DECL_ERR_RTOK;
1212 goto connect_abort;
1213 }
1214
1215 smc_close_init(smc);
1216 smc_rx_init(smc);
1217
1218 if (ini->first_contact_local) {
1219 if (smc_ib_ready_link(link)) {
1220 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1221 goto connect_abort;
1222 }
1223 } else {
1224 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
1225 reason_code = SMC_CLC_DECL_ERR_REGRMB;
1226 goto connect_abort;
1227 }
1228 }
1229 smc_rmb_sync_sg_for_device(&smc->conn);
1230
1231 if (aclc->hdr.version > SMC_V1) {
1232 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1233 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1234
1235 eid = clc_v2->r1.eid;
1236 if (ini->first_contact_local)
1237 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1238 link->smcibdev, link->gid);
1239 }
1240
1241 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
1242 aclc->hdr.version, eid, ini);
1243 if (reason_code)
1244 goto connect_abort;
1245
1246 smc_tx_init(smc);
1247
1248 if (ini->first_contact_local) {
1249 /* QP confirmation over RoCE fabric */
1250 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1251 reason_code = smcr_clnt_conf_first_link(smc);
1252 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1253 if (reason_code)
1254 goto connect_abort;
1255 }
1256 mutex_unlock(&smc_client_lgr_pending);
1257
1258 smc_copy_sock_settings_to_clc(smc);
1259 smc->connect_nonblock = 0;
1260 if (smc->sk.sk_state == SMC_INIT)
1261 smc->sk.sk_state = SMC_ACTIVE;
1262
1263 return 0;
1264 connect_abort:
1265 smc_conn_abort(smc, ini->first_contact_local);
1266 mutex_unlock(&smc_client_lgr_pending);
1267 smc->connect_nonblock = 0;
1268
1269 return reason_code;
1270 }
1271
1272 /* The server has chosen one of the proposed ISM devices for the communication.
1273 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1274 */
1275 static int
smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 * aclc,struct smc_init_info * ini)1276 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1277 struct smc_init_info *ini)
1278 {
1279 int i;
1280
1281 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
1282 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
1283 ini->ism_selected = i;
1284 return 0;
1285 }
1286 }
1287
1288 return -EPROTO;
1289 }
1290
1291 /* 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)1292 static int smc_connect_ism(struct smc_sock *smc,
1293 struct smc_clc_msg_accept_confirm *aclc,
1294 struct smc_init_info *ini)
1295 {
1296 u8 *eid = NULL;
1297 int rc = 0;
1298
1299 ini->is_smcd = true;
1300 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
1301
1302 if (aclc->hdr.version == SMC_V2) {
1303 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1304 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1305
1306 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1307 if (rc)
1308 return rc;
1309 }
1310 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1311
1312 /* there is only one lgr role for SMC-D; use server lock */
1313 mutex_lock(&smc_server_lgr_pending);
1314 rc = smc_conn_create(smc, ini);
1315 if (rc) {
1316 mutex_unlock(&smc_server_lgr_pending);
1317 return rc;
1318 }
1319
1320 /* Create send and receive buffers */
1321 rc = smc_buf_create(smc, true);
1322 if (rc) {
1323 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1324 goto connect_abort;
1325 }
1326
1327 smc_conn_save_peer_info(smc, aclc);
1328 smc_close_init(smc);
1329 smc_rx_init(smc);
1330 smc_tx_init(smc);
1331
1332 if (aclc->hdr.version > SMC_V1) {
1333 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1334 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1335
1336 eid = clc_v2->d1.eid;
1337 }
1338
1339 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
1340 aclc->hdr.version, eid, NULL);
1341 if (rc)
1342 goto connect_abort;
1343 mutex_unlock(&smc_server_lgr_pending);
1344
1345 smc_copy_sock_settings_to_clc(smc);
1346 smc->connect_nonblock = 0;
1347 if (smc->sk.sk_state == SMC_INIT)
1348 smc->sk.sk_state = SMC_ACTIVE;
1349
1350 return 0;
1351 connect_abort:
1352 smc_conn_abort(smc, ini->first_contact_local);
1353 mutex_unlock(&smc_server_lgr_pending);
1354 smc->connect_nonblock = 0;
1355
1356 return rc;
1357 }
1358
1359 /* 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)1360 static int smc_connect_check_aclc(struct smc_init_info *ini,
1361 struct smc_clc_msg_accept_confirm *aclc)
1362 {
1363 if (aclc->hdr.typev1 != SMC_TYPE_R &&
1364 aclc->hdr.typev1 != SMC_TYPE_D)
1365 return SMC_CLC_DECL_MODEUNSUPP;
1366
1367 if (aclc->hdr.version >= SMC_V2) {
1368 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1369 !smcr_indicated(ini->smc_type_v2)) ||
1370 (aclc->hdr.typev1 == SMC_TYPE_D &&
1371 !smcd_indicated(ini->smc_type_v2)))
1372 return SMC_CLC_DECL_MODEUNSUPP;
1373 } else {
1374 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1375 !smcr_indicated(ini->smc_type_v1)) ||
1376 (aclc->hdr.typev1 == SMC_TYPE_D &&
1377 !smcd_indicated(ini->smc_type_v1)))
1378 return SMC_CLC_DECL_MODEUNSUPP;
1379 }
1380
1381 return 0;
1382 }
1383
1384 /* perform steps before actually connecting */
__smc_connect(struct smc_sock * smc)1385 static int __smc_connect(struct smc_sock *smc)
1386 {
1387 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1388 struct smc_clc_msg_accept_confirm_v2 *aclc2;
1389 struct smc_clc_msg_accept_confirm *aclc;
1390 struct smc_init_info *ini = NULL;
1391 u8 *buf = NULL;
1392 int rc = 0;
1393
1394 if (smc->use_fallback)
1395 return smc_connect_fallback(smc, smc->fallback_rsn);
1396
1397 /* if peer has not signalled SMC-capability, fall back */
1398 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
1399 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
1400
1401 /* IPSec connections opt out of SMC optimizations */
1402 if (using_ipsec(smc))
1403 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1404 version);
1405
1406 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1407 if (!ini)
1408 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1409 version);
1410
1411 ini->smcd_version = SMC_V1 | SMC_V2;
1412 ini->smcr_version = SMC_V1 | SMC_V2;
1413 ini->smc_type_v1 = SMC_TYPE_B;
1414 ini->smc_type_v2 = SMC_TYPE_B;
1415
1416 /* get vlan id from IP device */
1417 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
1418 ini->smcd_version &= ~SMC_V1;
1419 ini->smcr_version = 0;
1420 ini->smc_type_v1 = SMC_TYPE_N;
1421 if (!ini->smcd_version) {
1422 rc = SMC_CLC_DECL_GETVLANERR;
1423 goto fallback;
1424 }
1425 }
1426
1427 rc = smc_find_proposal_devices(smc, ini);
1428 if (rc)
1429 goto fallback;
1430
1431 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1432 if (!buf) {
1433 rc = SMC_CLC_DECL_MEM;
1434 goto fallback;
1435 }
1436 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1437 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1438
1439 /* perform CLC handshake */
1440 rc = smc_connect_clc(smc, aclc2, ini);
1441 if (rc) {
1442 /* -EAGAIN on timeout, see tcp_recvmsg() */
1443 if (rc == -EAGAIN) {
1444 rc = -ETIMEDOUT;
1445 smc->sk.sk_err = ETIMEDOUT;
1446 }
1447 goto vlan_cleanup;
1448 }
1449
1450 /* check if smc modes and versions of CLC proposal and accept match */
1451 rc = smc_connect_check_aclc(ini, aclc);
1452 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1453 if (rc)
1454 goto vlan_cleanup;
1455
1456 /* depending on previous steps, connect using rdma or ism */
1457 if (aclc->hdr.typev1 == SMC_TYPE_R) {
1458 ini->smcr_version = version;
1459 rc = smc_connect_rdma(smc, aclc, ini);
1460 } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1461 ini->smcd_version = version;
1462 rc = smc_connect_ism(smc, aclc, ini);
1463 }
1464 if (rc)
1465 goto vlan_cleanup;
1466
1467 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1468 smc_connect_ism_vlan_cleanup(smc, ini);
1469 kfree(buf);
1470 kfree(ini);
1471 return 0;
1472
1473 vlan_cleanup:
1474 smc_connect_ism_vlan_cleanup(smc, ini);
1475 kfree(buf);
1476 fallback:
1477 kfree(ini);
1478 return smc_connect_decline_fallback(smc, rc, version);
1479 }
1480
smc_connect_work(struct work_struct * work)1481 static void smc_connect_work(struct work_struct *work)
1482 {
1483 struct smc_sock *smc = container_of(work, struct smc_sock,
1484 connect_work);
1485 long timeo = smc->sk.sk_sndtimeo;
1486 int rc = 0;
1487
1488 if (!timeo)
1489 timeo = MAX_SCHEDULE_TIMEOUT;
1490 lock_sock(smc->clcsock->sk);
1491 if (smc->clcsock->sk->sk_err) {
1492 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1493 } else if ((1 << smc->clcsock->sk->sk_state) &
1494 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1495 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1496 if ((rc == -EPIPE) &&
1497 ((1 << smc->clcsock->sk->sk_state) &
1498 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1499 rc = 0;
1500 }
1501 release_sock(smc->clcsock->sk);
1502 lock_sock(&smc->sk);
1503 if (rc != 0 || smc->sk.sk_err) {
1504 smc->sk.sk_state = SMC_CLOSED;
1505 if (rc == -EPIPE || rc == -EAGAIN)
1506 smc->sk.sk_err = EPIPE;
1507 else if (rc == -ECONNREFUSED)
1508 smc->sk.sk_err = ECONNREFUSED;
1509 else if (signal_pending(current))
1510 smc->sk.sk_err = -sock_intr_errno(timeo);
1511 sock_put(&smc->sk); /* passive closing */
1512 goto out;
1513 }
1514
1515 rc = __smc_connect(smc);
1516 if (rc < 0)
1517 smc->sk.sk_err = -rc;
1518
1519 out:
1520 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1521 if (smc->sk.sk_err) {
1522 smc->sk.sk_state_change(&smc->sk);
1523 } else { /* allow polling before and after fallback decision */
1524 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1525 smc->sk.sk_write_space(&smc->sk);
1526 }
1527 }
1528 release_sock(&smc->sk);
1529 }
1530
smc_connect(struct socket * sock,struct sockaddr * addr,int alen,int flags)1531 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1532 int alen, int flags)
1533 {
1534 struct sock *sk = sock->sk;
1535 struct smc_sock *smc;
1536 int rc = -EINVAL;
1537
1538 smc = smc_sk(sk);
1539
1540 /* separate smc parameter checking to be safe */
1541 if (alen < sizeof(addr->sa_family))
1542 goto out_err;
1543 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1544 goto out_err;
1545
1546 lock_sock(sk);
1547 switch (sock->state) {
1548 default:
1549 rc = -EINVAL;
1550 goto out;
1551 case SS_CONNECTED:
1552 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1553 goto out;
1554 case SS_CONNECTING:
1555 if (sk->sk_state == SMC_ACTIVE)
1556 goto connected;
1557 break;
1558 case SS_UNCONNECTED:
1559 sock->state = SS_CONNECTING;
1560 break;
1561 }
1562
1563 switch (sk->sk_state) {
1564 default:
1565 goto out;
1566 case SMC_CLOSED:
1567 rc = sock_error(sk) ? : -ECONNABORTED;
1568 sock->state = SS_UNCONNECTED;
1569 goto out;
1570 case SMC_ACTIVE:
1571 rc = -EISCONN;
1572 goto out;
1573 case SMC_INIT:
1574 break;
1575 }
1576
1577 smc_copy_sock_settings_to_clc(smc);
1578 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1579 if (smc->connect_nonblock) {
1580 rc = -EALREADY;
1581 goto out;
1582 }
1583 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1584 if (rc && rc != -EINPROGRESS)
1585 goto out;
1586
1587 if (smc->use_fallback) {
1588 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
1589 goto out;
1590 }
1591 sock_hold(&smc->sk); /* sock put in passive closing */
1592 if (flags & O_NONBLOCK) {
1593 if (queue_work(smc_hs_wq, &smc->connect_work))
1594 smc->connect_nonblock = 1;
1595 rc = -EINPROGRESS;
1596 goto out;
1597 } else {
1598 rc = __smc_connect(smc);
1599 if (rc < 0)
1600 goto out;
1601 }
1602
1603 connected:
1604 rc = 0;
1605 sock->state = SS_CONNECTED;
1606 out:
1607 release_sock(sk);
1608 out_err:
1609 return rc;
1610 }
1611
smc_clcsock_accept(struct smc_sock * lsmc,struct smc_sock ** new_smc)1612 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1613 {
1614 struct socket *new_clcsock = NULL;
1615 struct sock *lsk = &lsmc->sk;
1616 struct sock *new_sk;
1617 int rc = -EINVAL;
1618
1619 release_sock(lsk);
1620 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1621 if (!new_sk) {
1622 rc = -ENOMEM;
1623 lsk->sk_err = ENOMEM;
1624 *new_smc = NULL;
1625 lock_sock(lsk);
1626 goto out;
1627 }
1628 *new_smc = smc_sk(new_sk);
1629
1630 mutex_lock(&lsmc->clcsock_release_lock);
1631 if (lsmc->clcsock)
1632 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1633 mutex_unlock(&lsmc->clcsock_release_lock);
1634 lock_sock(lsk);
1635 if (rc < 0 && rc != -EAGAIN)
1636 lsk->sk_err = -rc;
1637 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1638 new_sk->sk_prot->unhash(new_sk);
1639 if (new_clcsock)
1640 sock_release(new_clcsock);
1641 new_sk->sk_state = SMC_CLOSED;
1642 sock_set_flag(new_sk, SOCK_DEAD);
1643 sock_put(new_sk); /* final */
1644 *new_smc = NULL;
1645 goto out;
1646 }
1647
1648 /* new clcsock has inherited the smc listen-specific sk_data_ready
1649 * function; switch it back to the original sk_data_ready function
1650 */
1651 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1652
1653 /* if new clcsock has also inherited the fallback-specific callback
1654 * functions, switch them back to the original ones.
1655 */
1656 if (lsmc->use_fallback) {
1657 if (lsmc->clcsk_state_change)
1658 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1659 if (lsmc->clcsk_write_space)
1660 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1661 if (lsmc->clcsk_error_report)
1662 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1663 }
1664
1665 (*new_smc)->clcsock = new_clcsock;
1666 out:
1667 return rc;
1668 }
1669
1670 /* add a just created sock to the accept queue of the listen sock as
1671 * candidate for a following socket accept call from user space
1672 */
smc_accept_enqueue(struct sock * parent,struct sock * sk)1673 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1674 {
1675 struct smc_sock *par = smc_sk(parent);
1676
1677 sock_hold(sk); /* sock_put in smc_accept_unlink () */
1678 spin_lock(&par->accept_q_lock);
1679 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1680 spin_unlock(&par->accept_q_lock);
1681 sk_acceptq_added(parent);
1682 }
1683
1684 /* remove a socket from the accept queue of its parental listening socket */
smc_accept_unlink(struct sock * sk)1685 static void smc_accept_unlink(struct sock *sk)
1686 {
1687 struct smc_sock *par = smc_sk(sk)->listen_smc;
1688
1689 spin_lock(&par->accept_q_lock);
1690 list_del_init(&smc_sk(sk)->accept_q);
1691 spin_unlock(&par->accept_q_lock);
1692 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1693 sock_put(sk); /* sock_hold in smc_accept_enqueue */
1694 }
1695
1696 /* remove a sock from the accept queue to bind it to a new socket created
1697 * for a socket accept call from user space
1698 */
smc_accept_dequeue(struct sock * parent,struct socket * new_sock)1699 struct sock *smc_accept_dequeue(struct sock *parent,
1700 struct socket *new_sock)
1701 {
1702 struct smc_sock *isk, *n;
1703 struct sock *new_sk;
1704
1705 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1706 new_sk = (struct sock *)isk;
1707
1708 smc_accept_unlink(new_sk);
1709 if (new_sk->sk_state == SMC_CLOSED) {
1710 new_sk->sk_prot->unhash(new_sk);
1711 if (isk->clcsock) {
1712 sock_release(isk->clcsock);
1713 isk->clcsock = NULL;
1714 }
1715 sock_put(new_sk); /* final */
1716 continue;
1717 }
1718 if (new_sock) {
1719 sock_graft(new_sk, new_sock);
1720 new_sock->state = SS_CONNECTED;
1721 if (isk->use_fallback) {
1722 smc_sk(new_sk)->clcsock->file = new_sock->file;
1723 isk->clcsock->file->private_data = isk->clcsock;
1724 }
1725 }
1726 return new_sk;
1727 }
1728 return NULL;
1729 }
1730
1731 /* clean up for a created but never accepted sock */
smc_close_non_accepted(struct sock * sk)1732 void smc_close_non_accepted(struct sock *sk)
1733 {
1734 struct smc_sock *smc = smc_sk(sk);
1735
1736 sock_hold(sk); /* sock_put below */
1737 lock_sock(sk);
1738 if (!sk->sk_lingertime)
1739 /* wait for peer closing */
1740 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
1741 __smc_release(smc);
1742 release_sock(sk);
1743 sock_put(sk); /* sock_hold above */
1744 sock_put(sk); /* final sock_put */
1745 }
1746
smcr_serv_conf_first_link(struct smc_sock * smc)1747 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1748 {
1749 struct smc_link *link = smc->conn.lnk;
1750 struct smc_llc_qentry *qentry;
1751 int rc;
1752
1753 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
1754 return SMC_CLC_DECL_ERR_REGRMB;
1755
1756 /* send CONFIRM LINK request to client over the RoCE fabric */
1757 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1758 if (rc < 0)
1759 return SMC_CLC_DECL_TIMEOUT_CL;
1760
1761 /* receive CONFIRM LINK response from client over the RoCE fabric */
1762 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1763 SMC_LLC_CONFIRM_LINK);
1764 if (!qentry) {
1765 struct smc_clc_msg_decline dclc;
1766
1767 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1768 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1769 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1770 }
1771 smc_llc_save_peer_uid(qentry);
1772 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1773 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1774 if (rc)
1775 return SMC_CLC_DECL_RMBE_EC;
1776
1777 /* confirm_rkey is implicit on 1st contact */
1778 smc->conn.rmb_desc->is_conf_rkey = true;
1779
1780 smc_llc_link_active(link);
1781 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1782
1783 /* initial contact - try to establish second link */
1784 smc_llc_srv_add_link(link, NULL);
1785 return 0;
1786 }
1787
1788 /* listen worker: finish */
smc_listen_out(struct smc_sock * new_smc)1789 static void smc_listen_out(struct smc_sock *new_smc)
1790 {
1791 struct smc_sock *lsmc = new_smc->listen_smc;
1792 struct sock *newsmcsk = &new_smc->sk;
1793
1794 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1795 atomic_dec(&lsmc->queued_smc_hs);
1796
1797 if (lsmc->sk.sk_state == SMC_LISTEN) {
1798 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1799 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1800 release_sock(&lsmc->sk);
1801 } else { /* no longer listening */
1802 smc_close_non_accepted(newsmcsk);
1803 }
1804
1805 /* Wake up accept */
1806 lsmc->sk.sk_data_ready(&lsmc->sk);
1807 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1808 }
1809
1810 /* listen worker: finish in state connected */
smc_listen_out_connected(struct smc_sock * new_smc)1811 static void smc_listen_out_connected(struct smc_sock *new_smc)
1812 {
1813 struct sock *newsmcsk = &new_smc->sk;
1814
1815 if (newsmcsk->sk_state == SMC_INIT)
1816 newsmcsk->sk_state = SMC_ACTIVE;
1817
1818 smc_listen_out(new_smc);
1819 }
1820
1821 /* listen worker: finish in error state */
smc_listen_out_err(struct smc_sock * new_smc)1822 static void smc_listen_out_err(struct smc_sock *new_smc)
1823 {
1824 struct sock *newsmcsk = &new_smc->sk;
1825 struct net *net = sock_net(newsmcsk);
1826
1827 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1828 if (newsmcsk->sk_state == SMC_INIT)
1829 sock_put(&new_smc->sk); /* passive closing */
1830 newsmcsk->sk_state = SMC_CLOSED;
1831
1832 smc_listen_out(new_smc);
1833 }
1834
1835 /* listen worker: decline and fall back if possible */
smc_listen_decline(struct smc_sock * new_smc,int reason_code,int local_first,u8 version)1836 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1837 int local_first, u8 version)
1838 {
1839 /* RDMA setup failed, switch back to TCP */
1840 smc_conn_abort(new_smc, local_first);
1841 if (reason_code < 0 ||
1842 smc_switch_to_fallback(new_smc, reason_code)) {
1843 /* error, no fallback possible */
1844 smc_listen_out_err(new_smc);
1845 return;
1846 }
1847 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1848 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1849 smc_listen_out_err(new_smc);
1850 return;
1851 }
1852 }
1853 smc_listen_out_connected(new_smc);
1854 }
1855
1856 /* listen worker: version checking */
smc_listen_v2_check(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)1857 static int smc_listen_v2_check(struct smc_sock *new_smc,
1858 struct smc_clc_msg_proposal *pclc,
1859 struct smc_init_info *ini)
1860 {
1861 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1862 struct smc_clc_v2_extension *pclc_v2_ext;
1863 int rc = SMC_CLC_DECL_PEERNOSMC;
1864
1865 ini->smc_type_v1 = pclc->hdr.typev1;
1866 ini->smc_type_v2 = pclc->hdr.typev2;
1867 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1868 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1869 if (pclc->hdr.version > SMC_V1) {
1870 if (smcd_indicated(ini->smc_type_v2))
1871 ini->smcd_version |= SMC_V2;
1872 if (smcr_indicated(ini->smc_type_v2))
1873 ini->smcr_version |= SMC_V2;
1874 }
1875 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1876 rc = SMC_CLC_DECL_PEERNOSMC;
1877 goto out;
1878 }
1879 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1880 if (!pclc_v2_ext) {
1881 ini->smcd_version &= ~SMC_V2;
1882 ini->smcr_version &= ~SMC_V2;
1883 rc = SMC_CLC_DECL_NOV2EXT;
1884 goto out;
1885 }
1886 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
1887 if (ini->smcd_version & SMC_V2) {
1888 if (!smc_ism_is_v2_capable()) {
1889 ini->smcd_version &= ~SMC_V2;
1890 rc = SMC_CLC_DECL_NOISM2SUPP;
1891 } else if (!pclc_smcd_v2_ext) {
1892 ini->smcd_version &= ~SMC_V2;
1893 rc = SMC_CLC_DECL_NOV2DEXT;
1894 } else if (!pclc_v2_ext->hdr.eid_cnt &&
1895 !pclc_v2_ext->hdr.flag.seid) {
1896 ini->smcd_version &= ~SMC_V2;
1897 rc = SMC_CLC_DECL_NOUEID;
1898 }
1899 }
1900 if (ini->smcr_version & SMC_V2) {
1901 if (!pclc_v2_ext->hdr.eid_cnt) {
1902 ini->smcr_version &= ~SMC_V2;
1903 rc = SMC_CLC_DECL_NOUEID;
1904 }
1905 }
1906
1907 out:
1908 if (!ini->smcd_version && !ini->smcr_version)
1909 return rc;
1910
1911 return 0;
1912 }
1913
1914 /* listen worker: check prefixes */
smc_listen_prfx_check(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc)1915 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1916 struct smc_clc_msg_proposal *pclc)
1917 {
1918 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1919 struct socket *newclcsock = new_smc->clcsock;
1920
1921 if (pclc->hdr.typev1 == SMC_TYPE_N)
1922 return 0;
1923 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1924 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1925 return SMC_CLC_DECL_DIFFPREFIX;
1926
1927 return 0;
1928 }
1929
1930 /* listen worker: initialize connection and buffers */
smc_listen_rdma_init(struct smc_sock * new_smc,struct smc_init_info * ini)1931 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1932 struct smc_init_info *ini)
1933 {
1934 int rc;
1935
1936 /* allocate connection / link group */
1937 rc = smc_conn_create(new_smc, ini);
1938 if (rc)
1939 return rc;
1940
1941 /* create send buffer and rmb */
1942 if (smc_buf_create(new_smc, false))
1943 return SMC_CLC_DECL_MEM;
1944
1945 return 0;
1946 }
1947
1948 /* listen worker: initialize connection and buffers for SMC-D */
smc_listen_ism_init(struct smc_sock * new_smc,struct smc_init_info * ini)1949 static int smc_listen_ism_init(struct smc_sock *new_smc,
1950 struct smc_init_info *ini)
1951 {
1952 int rc;
1953
1954 rc = smc_conn_create(new_smc, ini);
1955 if (rc)
1956 return rc;
1957
1958 /* Create send and receive buffers */
1959 rc = smc_buf_create(new_smc, true);
1960 if (rc) {
1961 smc_conn_abort(new_smc, ini->first_contact_local);
1962 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1963 SMC_CLC_DECL_MEM;
1964 }
1965
1966 return 0;
1967 }
1968
smc_is_already_selected(struct smcd_dev * smcd,struct smc_init_info * ini,int matches)1969 static bool smc_is_already_selected(struct smcd_dev *smcd,
1970 struct smc_init_info *ini,
1971 int matches)
1972 {
1973 int i;
1974
1975 for (i = 0; i < matches; i++)
1976 if (smcd == ini->ism_dev[i])
1977 return true;
1978
1979 return false;
1980 }
1981
1982 /* 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)1983 static void smc_check_ism_v2_match(struct smc_init_info *ini,
1984 u16 proposed_chid, u64 proposed_gid,
1985 unsigned int *matches)
1986 {
1987 struct smcd_dev *smcd;
1988
1989 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1990 if (smcd->going_away)
1991 continue;
1992 if (smc_is_already_selected(smcd, ini, *matches))
1993 continue;
1994 if (smc_ism_get_chid(smcd) == proposed_chid &&
1995 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1996 ini->ism_peer_gid[*matches] = proposed_gid;
1997 ini->ism_dev[*matches] = smcd;
1998 (*matches)++;
1999 break;
2000 }
2001 }
2002 }
2003
smc_find_ism_store_rc(u32 rc,struct smc_init_info * ini)2004 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2005 {
2006 if (!ini->rc)
2007 ini->rc = rc;
2008 }
2009
smc_find_ism_v2_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2010 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2011 struct smc_clc_msg_proposal *pclc,
2012 struct smc_init_info *ini)
2013 {
2014 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2015 struct smc_clc_v2_extension *smc_v2_ext;
2016 struct smc_clc_msg_smcd *pclc_smcd;
2017 unsigned int matches = 0;
2018 u8 smcd_version;
2019 u8 *eid = NULL;
2020 int i, rc;
2021
2022 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
2023 goto not_found;
2024
2025 pclc_smcd = smc_get_clc_msg_smcd(pclc);
2026 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2027 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
2028
2029 mutex_lock(&smcd_dev_list.mutex);
2030 if (pclc_smcd->ism.chid)
2031 /* check for ISM device matching proposed native ISM device */
2032 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2033 ntohll(pclc_smcd->ism.gid), &matches);
2034 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
2035 /* check for ISM devices matching proposed non-native ISM
2036 * devices
2037 */
2038 smc_check_ism_v2_match(ini,
2039 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
2040 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
2041 &matches);
2042 }
2043 mutex_unlock(&smcd_dev_list.mutex);
2044
2045 if (!ini->ism_dev[0]) {
2046 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
2047 goto not_found;
2048 }
2049
2050 smc_ism_get_system_eid(&eid);
2051 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2052 smcd_v2_ext->system_eid, eid))
2053 goto not_found;
2054
2055 /* separate - outside the smcd_dev_list.lock */
2056 smcd_version = ini->smcd_version;
2057 for (i = 0; i < matches; i++) {
2058 ini->smcd_version = SMC_V2;
2059 ini->is_smcd = true;
2060 ini->ism_selected = i;
2061 rc = smc_listen_ism_init(new_smc, ini);
2062 if (rc) {
2063 smc_find_ism_store_rc(rc, ini);
2064 /* try next active ISM device */
2065 continue;
2066 }
2067 return; /* matching and usable V2 ISM device found */
2068 }
2069 /* no V2 ISM device could be initialized */
2070 ini->smcd_version = smcd_version; /* restore original value */
2071 ini->negotiated_eid[0] = 0;
2072
2073 not_found:
2074 ini->smcd_version &= ~SMC_V2;
2075 ini->ism_dev[0] = NULL;
2076 ini->is_smcd = false;
2077 }
2078
smc_find_ism_v1_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2079 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2080 struct smc_clc_msg_proposal *pclc,
2081 struct smc_init_info *ini)
2082 {
2083 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
2084 int rc = 0;
2085
2086 /* check if ISM V1 is available */
2087 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
2088 goto not_found;
2089 ini->is_smcd = true; /* prepare ISM check */
2090 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
2091 rc = smc_find_ism_device(new_smc, ini);
2092 if (rc)
2093 goto not_found;
2094 ini->ism_selected = 0;
2095 rc = smc_listen_ism_init(new_smc, ini);
2096 if (!rc)
2097 return; /* V1 ISM device found */
2098
2099 not_found:
2100 smc_find_ism_store_rc(rc, ini);
2101 ini->smcd_version &= ~SMC_V1;
2102 ini->ism_dev[0] = NULL;
2103 ini->is_smcd = false;
2104 }
2105
2106 /* listen worker: register buffers */
smc_listen_rdma_reg(struct smc_sock * new_smc,bool local_first)2107 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
2108 {
2109 struct smc_connection *conn = &new_smc->conn;
2110
2111 if (!local_first) {
2112 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
2113 return SMC_CLC_DECL_ERR_REGRMB;
2114 }
2115 smc_rmb_sync_sg_for_device(&new_smc->conn);
2116
2117 return 0;
2118 }
2119
smc_find_rdma_v2_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2120 static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2121 struct smc_clc_msg_proposal *pclc,
2122 struct smc_init_info *ini)
2123 {
2124 struct smc_clc_v2_extension *smc_v2_ext;
2125 u8 smcr_version;
2126 int rc;
2127
2128 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2129 goto not_found;
2130
2131 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2132 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2133 goto not_found;
2134
2135 /* prepare RDMA check */
2136 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2137 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2138 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2139 ini->check_smcrv2 = true;
2140 ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2141 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2142 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2143 rc = smc_find_rdma_device(new_smc, ini);
2144 if (rc) {
2145 smc_find_ism_store_rc(rc, ini);
2146 goto not_found;
2147 }
2148 if (!ini->smcrv2.uses_gateway)
2149 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2150
2151 smcr_version = ini->smcr_version;
2152 ini->smcr_version = SMC_V2;
2153 rc = smc_listen_rdma_init(new_smc, ini);
2154 if (!rc)
2155 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2156 if (!rc)
2157 return;
2158 ini->smcr_version = smcr_version;
2159 smc_find_ism_store_rc(rc, ini);
2160
2161 not_found:
2162 ini->smcr_version &= ~SMC_V2;
2163 ini->smcrv2.ib_dev_v2 = NULL;
2164 ini->check_smcrv2 = false;
2165 }
2166
smc_find_rdma_v1_device_serv(struct smc_sock * new_smc,struct smc_clc_msg_proposal * pclc,struct smc_init_info * ini)2167 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2168 struct smc_clc_msg_proposal *pclc,
2169 struct smc_init_info *ini)
2170 {
2171 int rc;
2172
2173 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
2174 return SMC_CLC_DECL_NOSMCDEV;
2175
2176 /* prepare RDMA check */
2177 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2178 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2179 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2180 rc = smc_find_rdma_device(new_smc, ini);
2181 if (rc) {
2182 /* no RDMA device found */
2183 return SMC_CLC_DECL_NOSMCDEV;
2184 }
2185 rc = smc_listen_rdma_init(new_smc, ini);
2186 if (rc)
2187 return rc;
2188 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2189 }
2190
2191 /* 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)2192 static int smc_listen_find_device(struct smc_sock *new_smc,
2193 struct smc_clc_msg_proposal *pclc,
2194 struct smc_init_info *ini)
2195 {
2196 int prfx_rc;
2197
2198 /* check for ISM device matching V2 proposed device */
2199 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2200 if (ini->ism_dev[0])
2201 return 0;
2202
2203 /* check for matching IP prefix and subnet length (V1) */
2204 prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2205 if (prfx_rc)
2206 smc_find_ism_store_rc(prfx_rc, ini);
2207
2208 /* get vlan id from IP device */
2209 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
2210 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
2211
2212 /* check for ISM device matching V1 proposed device */
2213 if (!prfx_rc)
2214 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
2215 if (ini->ism_dev[0])
2216 return 0;
2217
2218 if (!smcr_indicated(pclc->hdr.typev1) &&
2219 !smcr_indicated(pclc->hdr.typev2))
2220 /* skip RDMA and decline */
2221 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
2222
2223 /* check if RDMA V2 is available */
2224 smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2225 if (ini->smcrv2.ib_dev_v2)
2226 return 0;
2227
2228 /* check if RDMA V1 is available */
2229 if (!prfx_rc) {
2230 int rc;
2231
2232 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2233 smc_find_ism_store_rc(rc, ini);
2234 return (!rc) ? 0 : ini->rc;
2235 }
2236 return SMC_CLC_DECL_NOSMCDEV;
2237 }
2238
2239 /* 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)2240 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2241 struct smc_clc_msg_accept_confirm *cclc,
2242 bool local_first,
2243 struct smc_init_info *ini)
2244 {
2245 struct smc_link *link = new_smc->conn.lnk;
2246 int reason_code = 0;
2247
2248 if (local_first)
2249 smc_link_save_peer_info(link, cclc, ini);
2250
2251 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2252 return SMC_CLC_DECL_ERR_RTOK;
2253
2254 if (local_first) {
2255 if (smc_ib_ready_link(link))
2256 return SMC_CLC_DECL_ERR_RDYLNK;
2257 /* QP confirmation over RoCE fabric */
2258 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
2259 reason_code = smcr_serv_conf_first_link(new_smc);
2260 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
2261 }
2262 return reason_code;
2263 }
2264
2265 /* setup for connection of server */
smc_listen_work(struct work_struct * work)2266 static void smc_listen_work(struct work_struct *work)
2267 {
2268 struct smc_sock *new_smc = container_of(work, struct smc_sock,
2269 smc_listen_work);
2270 struct socket *newclcsock = new_smc->clcsock;
2271 struct smc_clc_msg_accept_confirm *cclc;
2272 struct smc_clc_msg_proposal_area *buf;
2273 struct smc_clc_msg_proposal *pclc;
2274 struct smc_init_info *ini = NULL;
2275 u8 proposal_version = SMC_V1;
2276 u8 accept_version;
2277 int rc = 0;
2278
2279 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2280 return smc_listen_out_err(new_smc);
2281
2282 if (new_smc->use_fallback) {
2283 smc_listen_out_connected(new_smc);
2284 return;
2285 }
2286
2287 /* check if peer is smc capable */
2288 if (!tcp_sk(newclcsock->sk)->syn_smc) {
2289 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2290 if (rc)
2291 smc_listen_out_err(new_smc);
2292 else
2293 smc_listen_out_connected(new_smc);
2294 return;
2295 }
2296
2297 /* do inband token exchange -
2298 * wait for and receive SMC Proposal CLC message
2299 */
2300 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2301 if (!buf) {
2302 rc = SMC_CLC_DECL_MEM;
2303 goto out_decl;
2304 }
2305 pclc = (struct smc_clc_msg_proposal *)buf;
2306 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
2307 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
2308 if (rc)
2309 goto out_decl;
2310
2311 if (pclc->hdr.version > SMC_V1)
2312 proposal_version = SMC_V2;
2313
2314 /* IPSec connections opt out of SMC optimizations */
2315 if (using_ipsec(new_smc)) {
2316 rc = SMC_CLC_DECL_IPSEC;
2317 goto out_decl;
2318 }
2319
2320 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2321 if (!ini) {
2322 rc = SMC_CLC_DECL_MEM;
2323 goto out_decl;
2324 }
2325
2326 /* initial version checking */
2327 rc = smc_listen_v2_check(new_smc, pclc, ini);
2328 if (rc)
2329 goto out_decl;
2330
2331 mutex_lock(&smc_server_lgr_pending);
2332 smc_close_init(new_smc);
2333 smc_rx_init(new_smc);
2334 smc_tx_init(new_smc);
2335
2336 /* determine ISM or RoCE device used for connection */
2337 rc = smc_listen_find_device(new_smc, pclc, ini);
2338 if (rc)
2339 goto out_unlock;
2340
2341 /* send SMC Accept CLC message */
2342 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
2343 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
2344 accept_version, ini->negotiated_eid);
2345 if (rc)
2346 goto out_unlock;
2347
2348 /* SMC-D does not need this lock any more */
2349 if (ini->is_smcd)
2350 mutex_unlock(&smc_server_lgr_pending);
2351
2352 /* receive SMC Confirm CLC message */
2353 memset(buf, 0, sizeof(*buf));
2354 cclc = (struct smc_clc_msg_accept_confirm *)buf;
2355 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
2356 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2357 if (rc) {
2358 if (!ini->is_smcd)
2359 goto out_unlock;
2360 goto out_decl;
2361 }
2362
2363 /* finish worker */
2364 if (!ini->is_smcd) {
2365 rc = smc_listen_rdma_finish(new_smc, cclc,
2366 ini->first_contact_local, ini);
2367 if (rc)
2368 goto out_unlock;
2369 mutex_unlock(&smc_server_lgr_pending);
2370 }
2371 smc_conn_save_peer_info(new_smc, cclc);
2372 smc_listen_out_connected(new_smc);
2373 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
2374 goto out_free;
2375
2376 out_unlock:
2377 mutex_unlock(&smc_server_lgr_pending);
2378 out_decl:
2379 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
2380 proposal_version);
2381 out_free:
2382 kfree(ini);
2383 kfree(buf);
2384 }
2385
smc_tcp_listen_work(struct work_struct * work)2386 static void smc_tcp_listen_work(struct work_struct *work)
2387 {
2388 struct smc_sock *lsmc = container_of(work, struct smc_sock,
2389 tcp_listen_work);
2390 struct sock *lsk = &lsmc->sk;
2391 struct smc_sock *new_smc;
2392 int rc = 0;
2393
2394 lock_sock(lsk);
2395 while (lsk->sk_state == SMC_LISTEN) {
2396 rc = smc_clcsock_accept(lsmc, &new_smc);
2397 if (rc) /* clcsock accept queue empty or error */
2398 goto out;
2399 if (!new_smc)
2400 continue;
2401
2402 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2403 atomic_inc(&lsmc->queued_smc_hs);
2404
2405 new_smc->listen_smc = lsmc;
2406 new_smc->use_fallback = lsmc->use_fallback;
2407 new_smc->fallback_rsn = lsmc->fallback_rsn;
2408 sock_hold(lsk); /* sock_put in smc_listen_work */
2409 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2410 smc_copy_sock_settings_to_smc(new_smc);
2411 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
2412 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
2413 sock_hold(&new_smc->sk); /* sock_put in passive closing */
2414 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
2415 sock_put(&new_smc->sk);
2416 }
2417
2418 out:
2419 release_sock(lsk);
2420 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2421 }
2422
smc_clcsock_data_ready(struct sock * listen_clcsock)2423 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2424 {
2425 struct smc_sock *lsmc;
2426
2427 read_lock_bh(&listen_clcsock->sk_callback_lock);
2428 lsmc = smc_clcsock_user_data(listen_clcsock);
2429 if (!lsmc)
2430 goto out;
2431 lsmc->clcsk_data_ready(listen_clcsock);
2432 if (lsmc->sk.sk_state == SMC_LISTEN) {
2433 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
2434 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
2435 sock_put(&lsmc->sk);
2436 }
2437 out:
2438 read_unlock_bh(&listen_clcsock->sk_callback_lock);
2439 }
2440
smc_listen(struct socket * sock,int backlog)2441 static int smc_listen(struct socket *sock, int backlog)
2442 {
2443 struct sock *sk = sock->sk;
2444 struct smc_sock *smc;
2445 int rc;
2446
2447 smc = smc_sk(sk);
2448 lock_sock(sk);
2449
2450 rc = -EINVAL;
2451 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2452 smc->connect_nonblock || sock->state != SS_UNCONNECTED)
2453 goto out;
2454
2455 rc = 0;
2456 if (sk->sk_state == SMC_LISTEN) {
2457 sk->sk_max_ack_backlog = backlog;
2458 goto out;
2459 }
2460 /* some socket options are handled in core, so we could not apply
2461 * them to the clc socket -- copy smc socket options to clc socket
2462 */
2463 smc_copy_sock_settings_to_clc(smc);
2464 if (!smc->use_fallback)
2465 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
2466
2467 /* save original sk_data_ready function and establish
2468 * smc-specific sk_data_ready function
2469 */
2470 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2471 smc->clcsock->sk->sk_user_data =
2472 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
2473 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2474 smc_clcsock_data_ready, &smc->clcsk_data_ready);
2475 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2476
2477 /* save original ops */
2478 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2479
2480 smc->af_ops = *smc->ori_af_ops;
2481 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2482
2483 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2484
2485 if (smc->limit_smc_hs)
2486 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
2487
2488 rc = kernel_listen(smc->clcsock, backlog);
2489 if (rc) {
2490 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
2491 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2492 &smc->clcsk_data_ready);
2493 smc->clcsock->sk->sk_user_data = NULL;
2494 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
2495 goto out;
2496 }
2497 sk->sk_max_ack_backlog = backlog;
2498 sk->sk_ack_backlog = 0;
2499 sk->sk_state = SMC_LISTEN;
2500
2501 out:
2502 release_sock(sk);
2503 return rc;
2504 }
2505
smc_accept(struct socket * sock,struct socket * new_sock,int flags,bool kern)2506 static int smc_accept(struct socket *sock, struct socket *new_sock,
2507 int flags, bool kern)
2508 {
2509 struct sock *sk = sock->sk, *nsk;
2510 DECLARE_WAITQUEUE(wait, current);
2511 struct smc_sock *lsmc;
2512 long timeo;
2513 int rc = 0;
2514
2515 lsmc = smc_sk(sk);
2516 sock_hold(sk); /* sock_put below */
2517 lock_sock(sk);
2518
2519 if (lsmc->sk.sk_state != SMC_LISTEN) {
2520 rc = -EINVAL;
2521 release_sock(sk);
2522 goto out;
2523 }
2524
2525 /* Wait for an incoming connection */
2526 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2527 add_wait_queue_exclusive(sk_sleep(sk), &wait);
2528 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2529 set_current_state(TASK_INTERRUPTIBLE);
2530 if (!timeo) {
2531 rc = -EAGAIN;
2532 break;
2533 }
2534 release_sock(sk);
2535 timeo = schedule_timeout(timeo);
2536 /* wakeup by sk_data_ready in smc_listen_work() */
2537 sched_annotate_sleep();
2538 lock_sock(sk);
2539 if (signal_pending(current)) {
2540 rc = sock_intr_errno(timeo);
2541 break;
2542 }
2543 }
2544 set_current_state(TASK_RUNNING);
2545 remove_wait_queue(sk_sleep(sk), &wait);
2546
2547 if (!rc)
2548 rc = sock_error(nsk);
2549 release_sock(sk);
2550 if (rc)
2551 goto out;
2552
2553 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2554 /* wait till data arrives on the socket */
2555 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2556 MSEC_PER_SEC);
2557 if (smc_sk(nsk)->use_fallback) {
2558 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2559
2560 lock_sock(clcsk);
2561 if (skb_queue_empty(&clcsk->sk_receive_queue))
2562 sk_wait_data(clcsk, &timeo, NULL);
2563 release_sock(clcsk);
2564 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2565 lock_sock(nsk);
2566 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
2567 release_sock(nsk);
2568 }
2569 }
2570
2571 out:
2572 sock_put(sk); /* sock_hold above */
2573 return rc;
2574 }
2575
smc_getname(struct socket * sock,struct sockaddr * addr,int peer)2576 static int smc_getname(struct socket *sock, struct sockaddr *addr,
2577 int peer)
2578 {
2579 struct smc_sock *smc;
2580
2581 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2582 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2583 return -ENOTCONN;
2584
2585 smc = smc_sk(sock->sk);
2586
2587 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2588 }
2589
smc_sendmsg(struct socket * sock,struct msghdr * msg,size_t len)2590 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2591 {
2592 struct sock *sk = sock->sk;
2593 struct smc_sock *smc;
2594 int rc = -EPIPE;
2595
2596 smc = smc_sk(sk);
2597 lock_sock(sk);
2598 if ((sk->sk_state != SMC_ACTIVE) &&
2599 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2600 (sk->sk_state != SMC_INIT))
2601 goto out;
2602
2603 if (msg->msg_flags & MSG_FASTOPEN) {
2604 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2605 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2606 if (rc)
2607 goto out;
2608 } else {
2609 rc = -EINVAL;
2610 goto out;
2611 }
2612 }
2613
2614 if (smc->use_fallback) {
2615 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2616 } else {
2617 rc = smc_tx_sendmsg(smc, msg, len);
2618 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2619 }
2620 out:
2621 release_sock(sk);
2622 return rc;
2623 }
2624
smc_recvmsg(struct socket * sock,struct msghdr * msg,size_t len,int flags)2625 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2626 int flags)
2627 {
2628 struct sock *sk = sock->sk;
2629 struct smc_sock *smc;
2630 int rc = -ENOTCONN;
2631
2632 smc = smc_sk(sk);
2633 lock_sock(sk);
2634 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2635 /* socket was connected before, no more data to read */
2636 rc = 0;
2637 goto out;
2638 }
2639 if ((sk->sk_state == SMC_INIT) ||
2640 (sk->sk_state == SMC_LISTEN) ||
2641 (sk->sk_state == SMC_CLOSED))
2642 goto out;
2643
2644 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2645 rc = 0;
2646 goto out;
2647 }
2648
2649 if (smc->use_fallback) {
2650 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2651 } else {
2652 msg->msg_namelen = 0;
2653 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2654 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2655 }
2656
2657 out:
2658 release_sock(sk);
2659 return rc;
2660 }
2661
smc_accept_poll(struct sock * parent)2662 static __poll_t smc_accept_poll(struct sock *parent)
2663 {
2664 struct smc_sock *isk = smc_sk(parent);
2665 __poll_t mask = 0;
2666
2667 spin_lock(&isk->accept_q_lock);
2668 if (!list_empty(&isk->accept_q))
2669 mask = EPOLLIN | EPOLLRDNORM;
2670 spin_unlock(&isk->accept_q_lock);
2671
2672 return mask;
2673 }
2674
smc_poll(struct file * file,struct socket * sock,poll_table * wait)2675 static __poll_t smc_poll(struct file *file, struct socket *sock,
2676 poll_table *wait)
2677 {
2678 struct sock *sk = sock->sk;
2679 struct smc_sock *smc;
2680 __poll_t mask = 0;
2681
2682 if (!sk)
2683 return EPOLLNVAL;
2684
2685 smc = smc_sk(sock->sk);
2686 if (smc->use_fallback) {
2687 /* delegate to CLC child sock */
2688 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2689 sk->sk_err = smc->clcsock->sk->sk_err;
2690 } else {
2691 if (sk->sk_state != SMC_CLOSED)
2692 sock_poll_wait(file, sock, wait);
2693 if (sk->sk_err)
2694 mask |= EPOLLERR;
2695 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2696 (sk->sk_state == SMC_CLOSED))
2697 mask |= EPOLLHUP;
2698 if (sk->sk_state == SMC_LISTEN) {
2699 /* woken up by sk_data_ready in smc_listen_work() */
2700 mask |= smc_accept_poll(sk);
2701 } else if (smc->use_fallback) { /* as result of connect_work()*/
2702 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2703 wait);
2704 sk->sk_err = smc->clcsock->sk->sk_err;
2705 } else {
2706 if ((sk->sk_state != SMC_INIT &&
2707 atomic_read(&smc->conn.sndbuf_space)) ||
2708 sk->sk_shutdown & SEND_SHUTDOWN) {
2709 mask |= EPOLLOUT | EPOLLWRNORM;
2710 } else {
2711 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2712 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2713 }
2714 if (atomic_read(&smc->conn.bytes_to_rcv))
2715 mask |= EPOLLIN | EPOLLRDNORM;
2716 if (sk->sk_shutdown & RCV_SHUTDOWN)
2717 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2718 if (sk->sk_state == SMC_APPCLOSEWAIT1)
2719 mask |= EPOLLIN;
2720 if (smc->conn.urg_state == SMC_URG_VALID)
2721 mask |= EPOLLPRI;
2722 }
2723 }
2724
2725 return mask;
2726 }
2727
smc_shutdown(struct socket * sock,int how)2728 static int smc_shutdown(struct socket *sock, int how)
2729 {
2730 struct sock *sk = sock->sk;
2731 bool do_shutdown = true;
2732 struct smc_sock *smc;
2733 int rc = -EINVAL;
2734 int old_state;
2735 int rc1 = 0;
2736
2737 smc = smc_sk(sk);
2738
2739 if ((how < SHUT_RD) || (how > SHUT_RDWR))
2740 return rc;
2741
2742 lock_sock(sk);
2743
2744 if (sock->state == SS_CONNECTING) {
2745 if (sk->sk_state == SMC_ACTIVE)
2746 sock->state = SS_CONNECTED;
2747 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2748 sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2749 sk->sk_state == SMC_APPCLOSEWAIT1 ||
2750 sk->sk_state == SMC_APPCLOSEWAIT2 ||
2751 sk->sk_state == SMC_APPFINCLOSEWAIT)
2752 sock->state = SS_DISCONNECTING;
2753 }
2754
2755 rc = -ENOTCONN;
2756 if ((sk->sk_state != SMC_ACTIVE) &&
2757 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2758 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2759 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2760 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2761 (sk->sk_state != SMC_APPFINCLOSEWAIT))
2762 goto out;
2763 if (smc->use_fallback) {
2764 rc = kernel_sock_shutdown(smc->clcsock, how);
2765 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2766 if (sk->sk_shutdown == SHUTDOWN_MASK) {
2767 sk->sk_state = SMC_CLOSED;
2768 sk->sk_socket->state = SS_UNCONNECTED;
2769 sock_put(sk);
2770 }
2771 goto out;
2772 }
2773 switch (how) {
2774 case SHUT_RDWR: /* shutdown in both directions */
2775 old_state = sk->sk_state;
2776 rc = smc_close_active(smc);
2777 if (old_state == SMC_ACTIVE &&
2778 sk->sk_state == SMC_PEERCLOSEWAIT1)
2779 do_shutdown = false;
2780 break;
2781 case SHUT_WR:
2782 rc = smc_close_shutdown_write(smc);
2783 break;
2784 case SHUT_RD:
2785 rc = 0;
2786 /* nothing more to do because peer is not involved */
2787 break;
2788 }
2789 if (do_shutdown && smc->clcsock)
2790 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2791 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2792 sk->sk_shutdown |= how + 1;
2793
2794 if (sk->sk_state == SMC_CLOSED)
2795 sock->state = SS_UNCONNECTED;
2796 else
2797 sock->state = SS_DISCONNECTING;
2798 out:
2799 release_sock(sk);
2800 return rc ? rc : rc1;
2801 }
2802
__smc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)2803 static int __smc_getsockopt(struct socket *sock, int level, int optname,
2804 char __user *optval, int __user *optlen)
2805 {
2806 struct smc_sock *smc;
2807 int val, len;
2808
2809 smc = smc_sk(sock->sk);
2810
2811 if (get_user(len, optlen))
2812 return -EFAULT;
2813
2814 len = min_t(int, len, sizeof(int));
2815
2816 if (len < 0)
2817 return -EINVAL;
2818
2819 switch (optname) {
2820 case SMC_LIMIT_HS:
2821 val = smc->limit_smc_hs;
2822 break;
2823 default:
2824 return -EOPNOTSUPP;
2825 }
2826
2827 if (put_user(len, optlen))
2828 return -EFAULT;
2829 if (copy_to_user(optval, &val, len))
2830 return -EFAULT;
2831
2832 return 0;
2833 }
2834
__smc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)2835 static int __smc_setsockopt(struct socket *sock, int level, int optname,
2836 sockptr_t optval, unsigned int optlen)
2837 {
2838 struct sock *sk = sock->sk;
2839 struct smc_sock *smc;
2840 int val, rc;
2841
2842 smc = smc_sk(sk);
2843
2844 lock_sock(sk);
2845 switch (optname) {
2846 case SMC_LIMIT_HS:
2847 if (optlen < sizeof(int)) {
2848 rc = -EINVAL;
2849 break;
2850 }
2851 if (copy_from_sockptr(&val, optval, sizeof(int))) {
2852 rc = -EFAULT;
2853 break;
2854 }
2855
2856 smc->limit_smc_hs = !!val;
2857 rc = 0;
2858 break;
2859 default:
2860 rc = -EOPNOTSUPP;
2861 break;
2862 }
2863 release_sock(sk);
2864
2865 return rc;
2866 }
2867
smc_setsockopt(struct socket * sock,int level,int optname,sockptr_t optval,unsigned int optlen)2868 static int smc_setsockopt(struct socket *sock, int level, int optname,
2869 sockptr_t optval, unsigned int optlen)
2870 {
2871 struct sock *sk = sock->sk;
2872 struct smc_sock *smc;
2873 int val, rc;
2874
2875 if (level == SOL_TCP && optname == TCP_ULP)
2876 return -EOPNOTSUPP;
2877 else if (level == SOL_SMC)
2878 return __smc_setsockopt(sock, level, optname, optval, optlen);
2879
2880 smc = smc_sk(sk);
2881
2882 /* generic setsockopts reaching us here always apply to the
2883 * CLC socket
2884 */
2885 mutex_lock(&smc->clcsock_release_lock);
2886 if (!smc->clcsock) {
2887 mutex_unlock(&smc->clcsock_release_lock);
2888 return -EBADF;
2889 }
2890 if (unlikely(!smc->clcsock->ops->setsockopt))
2891 rc = -EOPNOTSUPP;
2892 else
2893 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2894 optval, optlen);
2895 if (smc->clcsock->sk->sk_err) {
2896 sk->sk_err = smc->clcsock->sk->sk_err;
2897 sk_error_report(sk);
2898 }
2899 mutex_unlock(&smc->clcsock_release_lock);
2900
2901 if (optlen < sizeof(int))
2902 return -EINVAL;
2903 if (copy_from_sockptr(&val, optval, sizeof(int)))
2904 return -EFAULT;
2905
2906 lock_sock(sk);
2907 if (rc || smc->use_fallback)
2908 goto out;
2909 switch (optname) {
2910 case TCP_FASTOPEN:
2911 case TCP_FASTOPEN_CONNECT:
2912 case TCP_FASTOPEN_KEY:
2913 case TCP_FASTOPEN_NO_COOKIE:
2914 /* option not supported by SMC */
2915 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2916 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2917 } else {
2918 rc = -EINVAL;
2919 }
2920 break;
2921 case TCP_NODELAY:
2922 if (sk->sk_state != SMC_INIT &&
2923 sk->sk_state != SMC_LISTEN &&
2924 sk->sk_state != SMC_CLOSED) {
2925 if (val) {
2926 SMC_STAT_INC(smc, ndly_cnt);
2927 smc_tx_pending(&smc->conn);
2928 cancel_delayed_work(&smc->conn.tx_work);
2929 }
2930 }
2931 break;
2932 case TCP_CORK:
2933 if (sk->sk_state != SMC_INIT &&
2934 sk->sk_state != SMC_LISTEN &&
2935 sk->sk_state != SMC_CLOSED) {
2936 if (!val) {
2937 SMC_STAT_INC(smc, cork_cnt);
2938 smc_tx_pending(&smc->conn);
2939 cancel_delayed_work(&smc->conn.tx_work);
2940 }
2941 }
2942 break;
2943 case TCP_DEFER_ACCEPT:
2944 smc->sockopt_defer_accept = val;
2945 break;
2946 default:
2947 break;
2948 }
2949 out:
2950 release_sock(sk);
2951
2952 return rc;
2953 }
2954
smc_getsockopt(struct socket * sock,int level,int optname,char __user * optval,int __user * optlen)2955 static int smc_getsockopt(struct socket *sock, int level, int optname,
2956 char __user *optval, int __user *optlen)
2957 {
2958 struct smc_sock *smc;
2959 int rc;
2960
2961 if (level == SOL_SMC)
2962 return __smc_getsockopt(sock, level, optname, optval, optlen);
2963
2964 smc = smc_sk(sock->sk);
2965 mutex_lock(&smc->clcsock_release_lock);
2966 if (!smc->clcsock) {
2967 mutex_unlock(&smc->clcsock_release_lock);
2968 return -EBADF;
2969 }
2970 /* socket options apply to the CLC socket */
2971 if (unlikely(!smc->clcsock->ops->getsockopt)) {
2972 mutex_unlock(&smc->clcsock_release_lock);
2973 return -EOPNOTSUPP;
2974 }
2975 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2976 optval, optlen);
2977 mutex_unlock(&smc->clcsock_release_lock);
2978 return rc;
2979 }
2980
smc_ioctl(struct socket * sock,unsigned int cmd,unsigned long arg)2981 static int smc_ioctl(struct socket *sock, unsigned int cmd,
2982 unsigned long arg)
2983 {
2984 union smc_host_cursor cons, urg;
2985 struct smc_connection *conn;
2986 struct smc_sock *smc;
2987 int answ;
2988
2989 smc = smc_sk(sock->sk);
2990 conn = &smc->conn;
2991 lock_sock(&smc->sk);
2992 if (smc->use_fallback) {
2993 if (!smc->clcsock) {
2994 release_sock(&smc->sk);
2995 return -EBADF;
2996 }
2997 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2998 release_sock(&smc->sk);
2999 return answ;
3000 }
3001 switch (cmd) {
3002 case SIOCINQ: /* same as FIONREAD */
3003 if (smc->sk.sk_state == SMC_LISTEN) {
3004 release_sock(&smc->sk);
3005 return -EINVAL;
3006 }
3007 if (smc->sk.sk_state == SMC_INIT ||
3008 smc->sk.sk_state == SMC_CLOSED)
3009 answ = 0;
3010 else
3011 answ = atomic_read(&smc->conn.bytes_to_rcv);
3012 break;
3013 case SIOCOUTQ:
3014 /* output queue size (not send + not acked) */
3015 if (smc->sk.sk_state == SMC_LISTEN) {
3016 release_sock(&smc->sk);
3017 return -EINVAL;
3018 }
3019 if (smc->sk.sk_state == SMC_INIT ||
3020 smc->sk.sk_state == SMC_CLOSED)
3021 answ = 0;
3022 else
3023 answ = smc->conn.sndbuf_desc->len -
3024 atomic_read(&smc->conn.sndbuf_space);
3025 break;
3026 case SIOCOUTQNSD:
3027 /* output queue size (not send only) */
3028 if (smc->sk.sk_state == SMC_LISTEN) {
3029 release_sock(&smc->sk);
3030 return -EINVAL;
3031 }
3032 if (smc->sk.sk_state == SMC_INIT ||
3033 smc->sk.sk_state == SMC_CLOSED)
3034 answ = 0;
3035 else
3036 answ = smc_tx_prepared_sends(&smc->conn);
3037 break;
3038 case SIOCATMARK:
3039 if (smc->sk.sk_state == SMC_LISTEN) {
3040 release_sock(&smc->sk);
3041 return -EINVAL;
3042 }
3043 if (smc->sk.sk_state == SMC_INIT ||
3044 smc->sk.sk_state == SMC_CLOSED) {
3045 answ = 0;
3046 } else {
3047 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3048 smc_curs_copy(&urg, &conn->urg_curs, conn);
3049 answ = smc_curs_diff(conn->rmb_desc->len,
3050 &cons, &urg) == 1;
3051 }
3052 break;
3053 default:
3054 release_sock(&smc->sk);
3055 return -ENOIOCTLCMD;
3056 }
3057 release_sock(&smc->sk);
3058
3059 return put_user(answ, (int __user *)arg);
3060 }
3061
smc_sendpage(struct socket * sock,struct page * page,int offset,size_t size,int flags)3062 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
3063 int offset, size_t size, int flags)
3064 {
3065 struct sock *sk = sock->sk;
3066 struct smc_sock *smc;
3067 int rc = -EPIPE;
3068
3069 smc = smc_sk(sk);
3070 lock_sock(sk);
3071 if (sk->sk_state != SMC_ACTIVE) {
3072 release_sock(sk);
3073 goto out;
3074 }
3075 release_sock(sk);
3076 if (smc->use_fallback) {
3077 rc = kernel_sendpage(smc->clcsock, page, offset,
3078 size, flags);
3079 } else {
3080 lock_sock(sk);
3081 rc = smc_tx_sendpage(smc, page, offset, size, flags);
3082 release_sock(sk);
3083 SMC_STAT_INC(smc, sendpage_cnt);
3084 }
3085
3086 out:
3087 return rc;
3088 }
3089
3090 /* Map the affected portions of the rmbe into an spd, note the number of bytes
3091 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3092 * updates till whenever a respective page has been fully processed.
3093 * Note that subsequent recv() calls have to wait till all splice() processing
3094 * completed.
3095 */
smc_splice_read(struct socket * sock,loff_t * ppos,struct pipe_inode_info * pipe,size_t len,unsigned int flags)3096 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3097 struct pipe_inode_info *pipe, size_t len,
3098 unsigned int flags)
3099 {
3100 struct sock *sk = sock->sk;
3101 struct smc_sock *smc;
3102 int rc = -ENOTCONN;
3103
3104 smc = smc_sk(sk);
3105 lock_sock(sk);
3106 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3107 /* socket was connected before, no more data to read */
3108 rc = 0;
3109 goto out;
3110 }
3111 if (sk->sk_state == SMC_INIT ||
3112 sk->sk_state == SMC_LISTEN ||
3113 sk->sk_state == SMC_CLOSED)
3114 goto out;
3115
3116 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3117 rc = 0;
3118 goto out;
3119 }
3120
3121 if (smc->use_fallback) {
3122 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3123 pipe, len, flags);
3124 } else {
3125 if (*ppos) {
3126 rc = -ESPIPE;
3127 goto out;
3128 }
3129 if (flags & SPLICE_F_NONBLOCK)
3130 flags = MSG_DONTWAIT;
3131 else
3132 flags = 0;
3133 SMC_STAT_INC(smc, splice_cnt);
3134 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
3135 }
3136 out:
3137 release_sock(sk);
3138
3139 return rc;
3140 }
3141
3142 /* must look like tcp */
3143 static const struct proto_ops smc_sock_ops = {
3144 .family = PF_SMC,
3145 .owner = THIS_MODULE,
3146 .release = smc_release,
3147 .bind = smc_bind,
3148 .connect = smc_connect,
3149 .socketpair = sock_no_socketpair,
3150 .accept = smc_accept,
3151 .getname = smc_getname,
3152 .poll = smc_poll,
3153 .ioctl = smc_ioctl,
3154 .listen = smc_listen,
3155 .shutdown = smc_shutdown,
3156 .setsockopt = smc_setsockopt,
3157 .getsockopt = smc_getsockopt,
3158 .sendmsg = smc_sendmsg,
3159 .recvmsg = smc_recvmsg,
3160 .mmap = sock_no_mmap,
3161 .sendpage = smc_sendpage,
3162 .splice_read = smc_splice_read,
3163 };
3164
__smc_create(struct net * net,struct socket * sock,int protocol,int kern,struct socket * clcsock)3165 static int __smc_create(struct net *net, struct socket *sock, int protocol,
3166 int kern, struct socket *clcsock)
3167 {
3168 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
3169 struct smc_sock *smc;
3170 struct sock *sk;
3171 int rc;
3172
3173 rc = -ESOCKTNOSUPPORT;
3174 if (sock->type != SOCK_STREAM)
3175 goto out;
3176
3177 rc = -EPROTONOSUPPORT;
3178 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
3179 goto out;
3180
3181 rc = -ENOBUFS;
3182 sock->ops = &smc_sock_ops;
3183 sock->state = SS_UNCONNECTED;
3184 sk = smc_sock_alloc(net, sock, protocol);
3185 if (!sk)
3186 goto out;
3187
3188 /* create internal TCP socket for CLC handshake and fallback */
3189 smc = smc_sk(sk);
3190 smc->use_fallback = false; /* assume rdma capability first */
3191 smc->fallback_rsn = 0;
3192
3193 /* default behavior from limit_smc_hs in every net namespace */
3194 smc->limit_smc_hs = net->smc.limit_smc_hs;
3195
3196 rc = 0;
3197 if (!clcsock) {
3198 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3199 &smc->clcsock);
3200 if (rc) {
3201 sk_common_release(sk);
3202 goto out;
3203 }
3204 } else {
3205 smc->clcsock = clcsock;
3206 }
3207
3208 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
3209 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
3210
3211 out:
3212 return rc;
3213 }
3214
smc_create(struct net * net,struct socket * sock,int protocol,int kern)3215 static int smc_create(struct net *net, struct socket *sock, int protocol,
3216 int kern)
3217 {
3218 return __smc_create(net, sock, protocol, kern, NULL);
3219 }
3220
3221 static const struct net_proto_family smc_sock_family_ops = {
3222 .family = PF_SMC,
3223 .owner = THIS_MODULE,
3224 .create = smc_create,
3225 };
3226
smc_ulp_init(struct sock * sk)3227 static int smc_ulp_init(struct sock *sk)
3228 {
3229 struct socket *tcp = sk->sk_socket;
3230 struct net *net = sock_net(sk);
3231 struct socket *smcsock;
3232 int protocol, ret;
3233
3234 /* only TCP can be replaced */
3235 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3236 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3237 return -ESOCKTNOSUPPORT;
3238 /* don't handle wq now */
3239 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3240 return -ENOTCONN;
3241
3242 if (sk->sk_family == AF_INET)
3243 protocol = SMCPROTO_SMC;
3244 else
3245 protocol = SMCPROTO_SMC6;
3246
3247 smcsock = sock_alloc();
3248 if (!smcsock)
3249 return -ENFILE;
3250
3251 smcsock->type = SOCK_STREAM;
3252 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3253 ret = __smc_create(net, smcsock, protocol, 1, tcp);
3254 if (ret) {
3255 sock_release(smcsock); /* module_put() which ops won't be NULL */
3256 return ret;
3257 }
3258
3259 /* replace tcp socket to smc */
3260 smcsock->file = tcp->file;
3261 smcsock->file->private_data = smcsock;
3262 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3263 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3264 tcp->file = NULL;
3265
3266 return ret;
3267 }
3268
smc_ulp_clone(const struct request_sock * req,struct sock * newsk,const gfp_t priority)3269 static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3270 const gfp_t priority)
3271 {
3272 struct inet_connection_sock *icsk = inet_csk(newsk);
3273
3274 /* don't inherit ulp ops to child when listen */
3275 icsk->icsk_ulp_ops = NULL;
3276 }
3277
3278 static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3279 .name = "smc",
3280 .owner = THIS_MODULE,
3281 .init = smc_ulp_init,
3282 .clone = smc_ulp_clone,
3283 };
3284
3285 unsigned int smc_net_id;
3286
smc_net_init(struct net * net)3287 static __net_init int smc_net_init(struct net *net)
3288 {
3289 int rc;
3290
3291 rc = smc_sysctl_net_init(net);
3292 if (rc)
3293 return rc;
3294 return smc_pnet_net_init(net);
3295 }
3296
smc_net_exit(struct net * net)3297 static void __net_exit smc_net_exit(struct net *net)
3298 {
3299 smc_sysctl_net_exit(net);
3300 smc_pnet_net_exit(net);
3301 }
3302
smc_net_stat_init(struct net * net)3303 static __net_init int smc_net_stat_init(struct net *net)
3304 {
3305 return smc_stats_init(net);
3306 }
3307
smc_net_stat_exit(struct net * net)3308 static void __net_exit smc_net_stat_exit(struct net *net)
3309 {
3310 smc_stats_exit(net);
3311 }
3312
3313 static struct pernet_operations smc_net_ops = {
3314 .init = smc_net_init,
3315 .exit = smc_net_exit,
3316 .id = &smc_net_id,
3317 .size = sizeof(struct smc_net),
3318 };
3319
3320 static struct pernet_operations smc_net_stat_ops = {
3321 .init = smc_net_stat_init,
3322 .exit = smc_net_stat_exit,
3323 };
3324
smc_init(void)3325 static int __init smc_init(void)
3326 {
3327 int rc;
3328
3329 rc = register_pernet_subsys(&smc_net_ops);
3330 if (rc)
3331 return rc;
3332
3333 rc = register_pernet_subsys(&smc_net_stat_ops);
3334 if (rc)
3335 return rc;
3336
3337 smc_ism_init();
3338 smc_clc_init();
3339
3340 rc = smc_nl_init();
3341 if (rc)
3342 goto out_pernet_subsys;
3343
3344 rc = smc_pnet_init();
3345 if (rc)
3346 goto out_nl;
3347
3348 rc = -ENOMEM;
3349
3350 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3351 if (!smc_tcp_ls_wq)
3352 goto out_pnet;
3353
3354 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3355 if (!smc_hs_wq)
3356 goto out_alloc_tcp_ls_wq;
3357
3358 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3359 if (!smc_close_wq)
3360 goto out_alloc_hs_wq;
3361
3362 rc = smc_core_init();
3363 if (rc) {
3364 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
3365 goto out_alloc_wqs;
3366 }
3367
3368 rc = smc_llc_init();
3369 if (rc) {
3370 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
3371 goto out_core;
3372 }
3373
3374 rc = smc_cdc_init();
3375 if (rc) {
3376 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
3377 goto out_core;
3378 }
3379
3380 rc = proto_register(&smc_proto, 1);
3381 if (rc) {
3382 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
3383 goto out_core;
3384 }
3385
3386 rc = proto_register(&smc_proto6, 1);
3387 if (rc) {
3388 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3389 goto out_proto;
3390 }
3391
3392 rc = sock_register(&smc_sock_family_ops);
3393 if (rc) {
3394 pr_err("%s: sock_register fails with %d\n", __func__, rc);
3395 goto out_proto6;
3396 }
3397 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
3398 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
3399
3400 rc = smc_ib_register_client();
3401 if (rc) {
3402 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3403 goto out_sock;
3404 }
3405
3406 rc = tcp_register_ulp(&smc_ulp_ops);
3407 if (rc) {
3408 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
3409 goto out_ib;
3410 }
3411
3412 static_branch_enable(&tcp_have_smc);
3413 return 0;
3414
3415 out_ib:
3416 smc_ib_unregister_client();
3417 out_sock:
3418 sock_unregister(PF_SMC);
3419 out_proto6:
3420 proto_unregister(&smc_proto6);
3421 out_proto:
3422 proto_unregister(&smc_proto);
3423 out_core:
3424 smc_core_exit();
3425 out_alloc_wqs:
3426 destroy_workqueue(smc_close_wq);
3427 out_alloc_hs_wq:
3428 destroy_workqueue(smc_hs_wq);
3429 out_alloc_tcp_ls_wq:
3430 destroy_workqueue(smc_tcp_ls_wq);
3431 out_pnet:
3432 smc_pnet_exit();
3433 out_nl:
3434 smc_nl_exit();
3435 out_pernet_subsys:
3436 unregister_pernet_subsys(&smc_net_ops);
3437
3438 return rc;
3439 }
3440
smc_exit(void)3441 static void __exit smc_exit(void)
3442 {
3443 static_branch_disable(&tcp_have_smc);
3444 tcp_unregister_ulp(&smc_ulp_ops);
3445 sock_unregister(PF_SMC);
3446 smc_core_exit();
3447 smc_ib_unregister_client();
3448 destroy_workqueue(smc_close_wq);
3449 destroy_workqueue(smc_tcp_ls_wq);
3450 destroy_workqueue(smc_hs_wq);
3451 proto_unregister(&smc_proto6);
3452 proto_unregister(&smc_proto);
3453 smc_pnet_exit();
3454 smc_nl_exit();
3455 smc_clc_exit();
3456 unregister_pernet_subsys(&smc_net_stat_ops);
3457 unregister_pernet_subsys(&smc_net_ops);
3458 rcu_barrier();
3459 }
3460
3461 module_init(smc_init);
3462 module_exit(smc_exit);
3463
3464 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3465 MODULE_DESCRIPTION("smc socket address family");
3466 MODULE_LICENSE("GPL");
3467 MODULE_ALIAS_NETPROTO(PF_SMC);
3468 MODULE_ALIAS_TCP_ULP("smc");
3469