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Merge tag 'for-5.16/block-2021-10-29' of git://git.kernel.dk/linux-block
[mirror_ubuntu-kernels.git] / net / smc / af_smc.c
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
54 static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
55 * creation on server
56 */
57 static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
58 * creation on client
59 */
60
61 struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
62 struct workqueue_struct *smc_close_wq; /* wq for close work */
63
64 static void smc_tcp_listen_work(struct work_struct *);
65 static void smc_connect_work(struct work_struct *);
66
67 static void smc_set_keepalive(struct sock *sk, int val)
68 {
69 struct smc_sock *smc = smc_sk(sk);
70
71 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
72 }
73
74 static struct smc_hashinfo smc_v4_hashinfo = {
75 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
76 };
77
78 static struct smc_hashinfo smc_v6_hashinfo = {
79 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
80 };
81
82 int smc_hash_sk(struct sock *sk)
83 {
84 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
85 struct hlist_head *head;
86
87 head = &h->ht;
88
89 write_lock_bh(&h->lock);
90 sk_add_node(sk, head);
91 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
92 write_unlock_bh(&h->lock);
93
94 return 0;
95 }
96 EXPORT_SYMBOL_GPL(smc_hash_sk);
97
98 void smc_unhash_sk(struct sock *sk)
99 {
100 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
101
102 write_lock_bh(&h->lock);
103 if (sk_del_node_init(sk))
104 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
105 write_unlock_bh(&h->lock);
106 }
107 EXPORT_SYMBOL_GPL(smc_unhash_sk);
108
109 struct proto smc_proto = {
110 .name = "SMC",
111 .owner = THIS_MODULE,
112 .keepalive = smc_set_keepalive,
113 .hash = smc_hash_sk,
114 .unhash = smc_unhash_sk,
115 .obj_size = sizeof(struct smc_sock),
116 .h.smc_hash = &smc_v4_hashinfo,
117 .slab_flags = SLAB_TYPESAFE_BY_RCU,
118 };
119 EXPORT_SYMBOL_GPL(smc_proto);
120
121 struct proto smc_proto6 = {
122 .name = "SMC6",
123 .owner = THIS_MODULE,
124 .keepalive = smc_set_keepalive,
125 .hash = smc_hash_sk,
126 .unhash = smc_unhash_sk,
127 .obj_size = sizeof(struct smc_sock),
128 .h.smc_hash = &smc_v6_hashinfo,
129 .slab_flags = SLAB_TYPESAFE_BY_RCU,
130 };
131 EXPORT_SYMBOL_GPL(smc_proto6);
132
133 static void smc_restore_fallback_changes(struct smc_sock *smc)
134 {
135 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
136 smc->clcsock->file->private_data = smc->sk.sk_socket;
137 smc->clcsock->file = NULL;
138 }
139 }
140
141 static int __smc_release(struct smc_sock *smc)
142 {
143 struct sock *sk = &smc->sk;
144 int rc = 0;
145
146 if (!smc->use_fallback) {
147 rc = smc_close_active(smc);
148 sock_set_flag(sk, SOCK_DEAD);
149 sk->sk_shutdown |= SHUTDOWN_MASK;
150 } else {
151 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
152 sock_put(sk); /* passive closing */
153 if (sk->sk_state == SMC_LISTEN) {
154 /* wake up clcsock accept */
155 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
156 }
157 sk->sk_state = SMC_CLOSED;
158 sk->sk_state_change(sk);
159 smc_restore_fallback_changes(smc);
160 }
161
162 sk->sk_prot->unhash(sk);
163
164 if (sk->sk_state == SMC_CLOSED) {
165 if (smc->clcsock) {
166 release_sock(sk);
167 smc_clcsock_release(smc);
168 lock_sock(sk);
169 }
170 if (!smc->use_fallback)
171 smc_conn_free(&smc->conn);
172 }
173
174 return rc;
175 }
176
177 static int smc_release(struct socket *sock)
178 {
179 struct sock *sk = sock->sk;
180 struct smc_sock *smc;
181 int rc = 0;
182
183 if (!sk)
184 goto out;
185
186 sock_hold(sk); /* sock_put below */
187 smc = smc_sk(sk);
188
189 /* cleanup for a dangling non-blocking connect */
190 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
191 tcp_abort(smc->clcsock->sk, ECONNABORTED);
192 flush_work(&smc->connect_work);
193
194 if (sk->sk_state == SMC_LISTEN)
195 /* smc_close_non_accepted() is called and acquires
196 * sock lock for child sockets again
197 */
198 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
199 else
200 lock_sock(sk);
201
202 rc = __smc_release(smc);
203
204 /* detach socket */
205 sock_orphan(sk);
206 sock->sk = NULL;
207 release_sock(sk);
208
209 sock_put(sk); /* sock_hold above */
210 sock_put(sk); /* final sock_put */
211 out:
212 return rc;
213 }
214
215 static void smc_destruct(struct sock *sk)
216 {
217 if (sk->sk_state != SMC_CLOSED)
218 return;
219 if (!sock_flag(sk, SOCK_DEAD))
220 return;
221
222 sk_refcnt_debug_dec(sk);
223 }
224
225 static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
226 int protocol)
227 {
228 struct smc_sock *smc;
229 struct proto *prot;
230 struct sock *sk;
231
232 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
233 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
234 if (!sk)
235 return NULL;
236
237 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
238 sk->sk_state = SMC_INIT;
239 sk->sk_destruct = smc_destruct;
240 sk->sk_protocol = protocol;
241 smc = smc_sk(sk);
242 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
243 INIT_WORK(&smc->connect_work, smc_connect_work);
244 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
245 INIT_LIST_HEAD(&smc->accept_q);
246 spin_lock_init(&smc->accept_q_lock);
247 spin_lock_init(&smc->conn.send_lock);
248 sk->sk_prot->hash(sk);
249 sk_refcnt_debug_inc(sk);
250 mutex_init(&smc->clcsock_release_lock);
251
252 return sk;
253 }
254
255 static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
256 int addr_len)
257 {
258 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
259 struct sock *sk = sock->sk;
260 struct smc_sock *smc;
261 int rc;
262
263 smc = smc_sk(sk);
264
265 /* replicate tests from inet_bind(), to be safe wrt. future changes */
266 rc = -EINVAL;
267 if (addr_len < sizeof(struct sockaddr_in))
268 goto out;
269
270 rc = -EAFNOSUPPORT;
271 if (addr->sin_family != AF_INET &&
272 addr->sin_family != AF_INET6 &&
273 addr->sin_family != AF_UNSPEC)
274 goto out;
275 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
276 if (addr->sin_family == AF_UNSPEC &&
277 addr->sin_addr.s_addr != htonl(INADDR_ANY))
278 goto out;
279
280 lock_sock(sk);
281
282 /* Check if socket is already active */
283 rc = -EINVAL;
284 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
285 goto out_rel;
286
287 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
288 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
289
290 out_rel:
291 release_sock(sk);
292 out:
293 return rc;
294 }
295
296 static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
297 unsigned long mask)
298 {
299 /* options we don't get control via setsockopt for */
300 nsk->sk_type = osk->sk_type;
301 nsk->sk_sndbuf = osk->sk_sndbuf;
302 nsk->sk_rcvbuf = osk->sk_rcvbuf;
303 nsk->sk_sndtimeo = osk->sk_sndtimeo;
304 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
305 nsk->sk_mark = osk->sk_mark;
306 nsk->sk_priority = osk->sk_priority;
307 nsk->sk_rcvlowat = osk->sk_rcvlowat;
308 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
309 nsk->sk_err = osk->sk_err;
310
311 nsk->sk_flags &= ~mask;
312 nsk->sk_flags |= osk->sk_flags & mask;
313 }
314
315 #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
316 (1UL << SOCK_KEEPOPEN) | \
317 (1UL << SOCK_LINGER) | \
318 (1UL << SOCK_BROADCAST) | \
319 (1UL << SOCK_TIMESTAMP) | \
320 (1UL << SOCK_DBG) | \
321 (1UL << SOCK_RCVTSTAMP) | \
322 (1UL << SOCK_RCVTSTAMPNS) | \
323 (1UL << SOCK_LOCALROUTE) | \
324 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
325 (1UL << SOCK_RXQ_OVFL) | \
326 (1UL << SOCK_WIFI_STATUS) | \
327 (1UL << SOCK_NOFCS) | \
328 (1UL << SOCK_FILTER_LOCKED) | \
329 (1UL << SOCK_TSTAMP_NEW))
330 /* copy only relevant settings and flags of SOL_SOCKET level from smc to
331 * clc socket (since smc is not called for these options from net/core)
332 */
333 static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
334 {
335 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
336 }
337
338 #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
339 (1UL << SOCK_KEEPOPEN) | \
340 (1UL << SOCK_LINGER) | \
341 (1UL << SOCK_DBG))
342 /* copy only settings and flags relevant for smc from clc to smc socket */
343 static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
344 {
345 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
346 }
347
348 /* register the new rmb on all links */
349 static int smcr_lgr_reg_rmbs(struct smc_link *link,
350 struct smc_buf_desc *rmb_desc)
351 {
352 struct smc_link_group *lgr = link->lgr;
353 int i, rc = 0;
354
355 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
356 if (rc)
357 return rc;
358 /* protect against parallel smc_llc_cli_rkey_exchange() and
359 * parallel smcr_link_reg_rmb()
360 */
361 mutex_lock(&lgr->llc_conf_mutex);
362 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
363 if (!smc_link_active(&lgr->lnk[i]))
364 continue;
365 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
366 if (rc)
367 goto out;
368 }
369
370 /* exchange confirm_rkey msg with peer */
371 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
372 if (rc) {
373 rc = -EFAULT;
374 goto out;
375 }
376 rmb_desc->is_conf_rkey = true;
377 out:
378 mutex_unlock(&lgr->llc_conf_mutex);
379 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
380 return rc;
381 }
382
383 static int smcr_clnt_conf_first_link(struct smc_sock *smc)
384 {
385 struct smc_link *link = smc->conn.lnk;
386 struct smc_llc_qentry *qentry;
387 int rc;
388
389 /* receive CONFIRM LINK request from server over RoCE fabric */
390 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
391 SMC_LLC_CONFIRM_LINK);
392 if (!qentry) {
393 struct smc_clc_msg_decline dclc;
394
395 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
396 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
397 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
398 }
399 smc_llc_save_peer_uid(qentry);
400 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
401 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
402 if (rc)
403 return SMC_CLC_DECL_RMBE_EC;
404
405 rc = smc_ib_modify_qp_rts(link);
406 if (rc)
407 return SMC_CLC_DECL_ERR_RDYLNK;
408
409 smc_wr_remember_qp_attr(link);
410
411 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
412 return SMC_CLC_DECL_ERR_REGRMB;
413
414 /* confirm_rkey is implicit on 1st contact */
415 smc->conn.rmb_desc->is_conf_rkey = true;
416
417 /* send CONFIRM LINK response over RoCE fabric */
418 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
419 if (rc < 0)
420 return SMC_CLC_DECL_TIMEOUT_CL;
421
422 smc_llc_link_active(link);
423 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
424
425 /* optional 2nd link, receive ADD LINK request from server */
426 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
427 SMC_LLC_ADD_LINK);
428 if (!qentry) {
429 struct smc_clc_msg_decline dclc;
430
431 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
432 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
433 if (rc == -EAGAIN)
434 rc = 0; /* no DECLINE received, go with one link */
435 return rc;
436 }
437 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
438 smc_llc_cli_add_link(link, qentry);
439 return 0;
440 }
441
442 static void smcr_conn_save_peer_info(struct smc_sock *smc,
443 struct smc_clc_msg_accept_confirm *clc)
444 {
445 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
446
447 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
448 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
449 smc->conn.peer_rmbe_size = bufsize;
450 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
451 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
452 }
453
454 static bool smc_isascii(char *hostname)
455 {
456 int i;
457
458 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
459 if (!isascii(hostname[i]))
460 return false;
461 return true;
462 }
463
464 static void smcd_conn_save_peer_info(struct smc_sock *smc,
465 struct smc_clc_msg_accept_confirm *clc)
466 {
467 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
468
469 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
470 smc->conn.peer_token = clc->d0.token;
471 /* msg header takes up space in the buffer */
472 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
473 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
474 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
475 if (clc->hdr.version > SMC_V1 &&
476 (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) {
477 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
478 (struct smc_clc_msg_accept_confirm_v2 *)clc;
479 struct smc_clc_first_contact_ext *fce =
480 (struct smc_clc_first_contact_ext *)
481 (((u8 *)clc_v2) + sizeof(*clc_v2));
482
483 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid,
484 SMC_MAX_EID_LEN);
485 smc->conn.lgr->peer_os = fce->os_type;
486 smc->conn.lgr->peer_smc_release = fce->release;
487 if (smc_isascii(fce->hostname))
488 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
489 SMC_MAX_HOSTNAME_LEN);
490 }
491 }
492
493 static void smc_conn_save_peer_info(struct smc_sock *smc,
494 struct smc_clc_msg_accept_confirm *clc)
495 {
496 if (smc->conn.lgr->is_smcd)
497 smcd_conn_save_peer_info(smc, clc);
498 else
499 smcr_conn_save_peer_info(smc, clc);
500 }
501
502 static void smc_link_save_peer_info(struct smc_link *link,
503 struct smc_clc_msg_accept_confirm *clc)
504 {
505 link->peer_qpn = ntoh24(clc->r0.qpn);
506 memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
507 memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
508 link->peer_psn = ntoh24(clc->r0.psn);
509 link->peer_mtu = clc->r0.qp_mtu;
510 }
511
512 static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
513 struct smc_stats_fback *fback_arr)
514 {
515 int cnt;
516
517 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
518 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
519 fback_arr[cnt].count++;
520 break;
521 }
522 if (!fback_arr[cnt].fback_code) {
523 fback_arr[cnt].fback_code = smc->fallback_rsn;
524 fback_arr[cnt].count++;
525 break;
526 }
527 }
528 }
529
530 static void smc_stat_fallback(struct smc_sock *smc)
531 {
532 struct net *net = sock_net(&smc->sk);
533
534 mutex_lock(&net->smc.mutex_fback_rsn);
535 if (smc->listen_smc) {
536 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
537 net->smc.fback_rsn->srv_fback_cnt++;
538 } else {
539 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
540 net->smc.fback_rsn->clnt_fback_cnt++;
541 }
542 mutex_unlock(&net->smc.mutex_fback_rsn);
543 }
544
545 static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
546 {
547 smc->use_fallback = true;
548 smc->fallback_rsn = reason_code;
549 smc_stat_fallback(smc);
550 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
551 smc->clcsock->file = smc->sk.sk_socket->file;
552 smc->clcsock->file->private_data = smc->clcsock;
553 smc->clcsock->wq.fasync_list =
554 smc->sk.sk_socket->wq.fasync_list;
555 }
556 }
557
558 /* fall back during connect */
559 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
560 {
561 smc_switch_to_fallback(smc, reason_code);
562 smc_copy_sock_settings_to_clc(smc);
563 smc->connect_nonblock = 0;
564 if (smc->sk.sk_state == SMC_INIT)
565 smc->sk.sk_state = SMC_ACTIVE;
566 return 0;
567 }
568
569 /* decline and fall back during connect */
570 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
571 u8 version)
572 {
573 struct net *net = sock_net(&smc->sk);
574 int rc;
575
576 if (reason_code < 0) { /* error, fallback is not possible */
577 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
578 if (smc->sk.sk_state == SMC_INIT)
579 sock_put(&smc->sk); /* passive closing */
580 return reason_code;
581 }
582 if (reason_code != SMC_CLC_DECL_PEERDECL) {
583 rc = smc_clc_send_decline(smc, reason_code, version);
584 if (rc < 0) {
585 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
586 if (smc->sk.sk_state == SMC_INIT)
587 sock_put(&smc->sk); /* passive closing */
588 return rc;
589 }
590 }
591 return smc_connect_fallback(smc, reason_code);
592 }
593
594 static void smc_conn_abort(struct smc_sock *smc, int local_first)
595 {
596 if (local_first)
597 smc_lgr_cleanup_early(&smc->conn);
598 else
599 smc_conn_free(&smc->conn);
600 }
601
602 /* check if there is a rdma device available for this connection. */
603 /* called for connect and listen */
604 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
605 {
606 /* PNET table look up: search active ib_device and port
607 * within same PNETID that also contains the ethernet device
608 * used for the internal TCP socket
609 */
610 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
611 if (!ini->ib_dev)
612 return SMC_CLC_DECL_NOSMCRDEV;
613 return 0;
614 }
615
616 /* check if there is an ISM device available for this connection. */
617 /* called for connect and listen */
618 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
619 {
620 /* Find ISM device with same PNETID as connecting interface */
621 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
622 if (!ini->ism_dev[0])
623 return SMC_CLC_DECL_NOSMCDDEV;
624 else
625 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
626 return 0;
627 }
628
629 /* is chid unique for the ism devices that are already determined? */
630 static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
631 int cnt)
632 {
633 int i = (!ini->ism_dev[0]) ? 1 : 0;
634
635 for (; i < cnt; i++)
636 if (ini->ism_chid[i] == chid)
637 return false;
638 return true;
639 }
640
641 /* determine possible V2 ISM devices (either without PNETID or with PNETID plus
642 * PNETID matching net_device)
643 */
644 static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
645 struct smc_init_info *ini)
646 {
647 int rc = SMC_CLC_DECL_NOSMCDDEV;
648 struct smcd_dev *smcd;
649 int i = 1;
650 u16 chid;
651
652 if (smcd_indicated(ini->smc_type_v1))
653 rc = 0; /* already initialized for V1 */
654 mutex_lock(&smcd_dev_list.mutex);
655 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
656 if (smcd->going_away || smcd == ini->ism_dev[0])
657 continue;
658 chid = smc_ism_get_chid(smcd);
659 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
660 continue;
661 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
662 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
663 ini->ism_dev[i] = smcd;
664 ini->ism_chid[i] = chid;
665 ini->is_smcd = true;
666 rc = 0;
667 i++;
668 if (i > SMC_MAX_ISM_DEVS)
669 break;
670 }
671 }
672 mutex_unlock(&smcd_dev_list.mutex);
673 ini->ism_offered_cnt = i - 1;
674 if (!ini->ism_dev[0] && !ini->ism_dev[1])
675 ini->smcd_version = 0;
676
677 return rc;
678 }
679
680 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
681 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
682 struct smc_init_info *ini)
683 {
684 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
685 return SMC_CLC_DECL_ISMVLANERR;
686 return 0;
687 }
688
689 static int smc_find_proposal_devices(struct smc_sock *smc,
690 struct smc_init_info *ini)
691 {
692 int rc = 0;
693
694 /* check if there is an ism device available */
695 if (ini->smcd_version & SMC_V1) {
696 if (smc_find_ism_device(smc, ini) ||
697 smc_connect_ism_vlan_setup(smc, ini)) {
698 if (ini->smc_type_v1 == SMC_TYPE_B)
699 ini->smc_type_v1 = SMC_TYPE_R;
700 else
701 ini->smc_type_v1 = SMC_TYPE_N;
702 } /* else ISM V1 is supported for this connection */
703 if (smc_find_rdma_device(smc, ini)) {
704 if (ini->smc_type_v1 == SMC_TYPE_B)
705 ini->smc_type_v1 = SMC_TYPE_D;
706 else
707 ini->smc_type_v1 = SMC_TYPE_N;
708 } /* else RDMA is supported for this connection */
709 }
710 if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini))
711 ini->smc_type_v2 = SMC_TYPE_N;
712
713 /* if neither ISM nor RDMA are supported, fallback */
714 if (!smcr_indicated(ini->smc_type_v1) &&
715 ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
716 rc = SMC_CLC_DECL_NOSMCDEV;
717
718 return rc;
719 }
720
721 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
722 * used, the VLAN ID will be registered again during the connection setup.
723 */
724 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
725 struct smc_init_info *ini)
726 {
727 if (!smcd_indicated(ini->smc_type_v1))
728 return 0;
729 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
730 return SMC_CLC_DECL_CNFERR;
731 return 0;
732 }
733
734 #define SMC_CLC_MAX_ACCEPT_LEN \
735 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
736 sizeof(struct smc_clc_first_contact_ext) + \
737 sizeof(struct smc_clc_msg_trail))
738
739 /* CLC handshake during connect */
740 static int smc_connect_clc(struct smc_sock *smc,
741 struct smc_clc_msg_accept_confirm_v2 *aclc2,
742 struct smc_init_info *ini)
743 {
744 int rc = 0;
745
746 /* do inband token exchange */
747 rc = smc_clc_send_proposal(smc, ini);
748 if (rc)
749 return rc;
750 /* receive SMC Accept CLC message */
751 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
752 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
753 }
754
755 /* setup for RDMA connection of client */
756 static int smc_connect_rdma(struct smc_sock *smc,
757 struct smc_clc_msg_accept_confirm *aclc,
758 struct smc_init_info *ini)
759 {
760 int i, reason_code = 0;
761 struct smc_link *link;
762
763 ini->is_smcd = false;
764 ini->ib_lcl = &aclc->r0.lcl;
765 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
766 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
767
768 mutex_lock(&smc_client_lgr_pending);
769 reason_code = smc_conn_create(smc, ini);
770 if (reason_code) {
771 mutex_unlock(&smc_client_lgr_pending);
772 return reason_code;
773 }
774
775 smc_conn_save_peer_info(smc, aclc);
776
777 if (ini->first_contact_local) {
778 link = smc->conn.lnk;
779 } else {
780 /* set link that was assigned by server */
781 link = NULL;
782 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
783 struct smc_link *l = &smc->conn.lgr->lnk[i];
784
785 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
786 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
787 SMC_GID_SIZE) &&
788 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
789 sizeof(l->peer_mac))) {
790 link = l;
791 break;
792 }
793 }
794 if (!link) {
795 reason_code = SMC_CLC_DECL_NOSRVLINK;
796 goto connect_abort;
797 }
798 smc_switch_link_and_count(&smc->conn, link);
799 }
800
801 /* create send buffer and rmb */
802 if (smc_buf_create(smc, false)) {
803 reason_code = SMC_CLC_DECL_MEM;
804 goto connect_abort;
805 }
806
807 if (ini->first_contact_local)
808 smc_link_save_peer_info(link, aclc);
809
810 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
811 reason_code = SMC_CLC_DECL_ERR_RTOK;
812 goto connect_abort;
813 }
814
815 smc_close_init(smc);
816 smc_rx_init(smc);
817
818 if (ini->first_contact_local) {
819 if (smc_ib_ready_link(link)) {
820 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
821 goto connect_abort;
822 }
823 } else {
824 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
825 reason_code = SMC_CLC_DECL_ERR_REGRMB;
826 goto connect_abort;
827 }
828 }
829 smc_rmb_sync_sg_for_device(&smc->conn);
830
831 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
832 SMC_V1);
833 if (reason_code)
834 goto connect_abort;
835
836 smc_tx_init(smc);
837
838 if (ini->first_contact_local) {
839 /* QP confirmation over RoCE fabric */
840 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
841 reason_code = smcr_clnt_conf_first_link(smc);
842 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
843 if (reason_code)
844 goto connect_abort;
845 }
846 mutex_unlock(&smc_client_lgr_pending);
847
848 smc_copy_sock_settings_to_clc(smc);
849 smc->connect_nonblock = 0;
850 if (smc->sk.sk_state == SMC_INIT)
851 smc->sk.sk_state = SMC_ACTIVE;
852
853 return 0;
854 connect_abort:
855 smc_conn_abort(smc, ini->first_contact_local);
856 mutex_unlock(&smc_client_lgr_pending);
857 smc->connect_nonblock = 0;
858
859 return reason_code;
860 }
861
862 /* The server has chosen one of the proposed ISM devices for the communication.
863 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
864 */
865 static int
866 smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
867 struct smc_init_info *ini)
868 {
869 int i;
870
871 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
872 if (ini->ism_chid[i] == ntohs(aclc->chid)) {
873 ini->ism_selected = i;
874 return 0;
875 }
876 }
877
878 return -EPROTO;
879 }
880
881 /* setup for ISM connection of client */
882 static int smc_connect_ism(struct smc_sock *smc,
883 struct smc_clc_msg_accept_confirm *aclc,
884 struct smc_init_info *ini)
885 {
886 int rc = 0;
887
888 ini->is_smcd = true;
889 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
890
891 if (aclc->hdr.version == SMC_V2) {
892 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
893 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
894
895 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
896 if (rc)
897 return rc;
898 }
899 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
900
901 /* there is only one lgr role for SMC-D; use server lock */
902 mutex_lock(&smc_server_lgr_pending);
903 rc = smc_conn_create(smc, ini);
904 if (rc) {
905 mutex_unlock(&smc_server_lgr_pending);
906 return rc;
907 }
908
909 /* Create send and receive buffers */
910 rc = smc_buf_create(smc, true);
911 if (rc) {
912 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
913 goto connect_abort;
914 }
915
916 smc_conn_save_peer_info(smc, aclc);
917 smc_close_init(smc);
918 smc_rx_init(smc);
919 smc_tx_init(smc);
920
921 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
922 aclc->hdr.version);
923 if (rc)
924 goto connect_abort;
925 mutex_unlock(&smc_server_lgr_pending);
926
927 smc_copy_sock_settings_to_clc(smc);
928 smc->connect_nonblock = 0;
929 if (smc->sk.sk_state == SMC_INIT)
930 smc->sk.sk_state = SMC_ACTIVE;
931
932 return 0;
933 connect_abort:
934 smc_conn_abort(smc, ini->first_contact_local);
935 mutex_unlock(&smc_server_lgr_pending);
936 smc->connect_nonblock = 0;
937
938 return rc;
939 }
940
941 /* check if received accept type and version matches a proposed one */
942 static int smc_connect_check_aclc(struct smc_init_info *ini,
943 struct smc_clc_msg_accept_confirm *aclc)
944 {
945 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
946 !smcr_indicated(ini->smc_type_v1)) ||
947 (aclc->hdr.typev1 == SMC_TYPE_D &&
948 ((!smcd_indicated(ini->smc_type_v1) &&
949 !smcd_indicated(ini->smc_type_v2)) ||
950 (aclc->hdr.version == SMC_V1 &&
951 !smcd_indicated(ini->smc_type_v1)) ||
952 (aclc->hdr.version == SMC_V2 &&
953 !smcd_indicated(ini->smc_type_v2)))))
954 return SMC_CLC_DECL_MODEUNSUPP;
955
956 return 0;
957 }
958
959 /* perform steps before actually connecting */
960 static int __smc_connect(struct smc_sock *smc)
961 {
962 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
963 struct smc_clc_msg_accept_confirm_v2 *aclc2;
964 struct smc_clc_msg_accept_confirm *aclc;
965 struct smc_init_info *ini = NULL;
966 u8 *buf = NULL;
967 int rc = 0;
968
969 if (smc->use_fallback)
970 return smc_connect_fallback(smc, smc->fallback_rsn);
971
972 /* if peer has not signalled SMC-capability, fall back */
973 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
974 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
975
976 /* IPSec connections opt out of SMC optimizations */
977 if (using_ipsec(smc))
978 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
979 version);
980
981 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
982 if (!ini)
983 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
984 version);
985
986 ini->smcd_version = SMC_V1;
987 ini->smcd_version |= smc_ism_is_v2_capable() ? SMC_V2 : 0;
988 ini->smc_type_v1 = SMC_TYPE_B;
989 ini->smc_type_v2 = smc_ism_is_v2_capable() ? SMC_TYPE_D : SMC_TYPE_N;
990
991 /* get vlan id from IP device */
992 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
993 ini->smcd_version &= ~SMC_V1;
994 ini->smc_type_v1 = SMC_TYPE_N;
995 if (!ini->smcd_version) {
996 rc = SMC_CLC_DECL_GETVLANERR;
997 goto fallback;
998 }
999 }
1000
1001 rc = smc_find_proposal_devices(smc, ini);
1002 if (rc)
1003 goto fallback;
1004
1005 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1006 if (!buf) {
1007 rc = SMC_CLC_DECL_MEM;
1008 goto fallback;
1009 }
1010 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1011 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1012
1013 /* perform CLC handshake */
1014 rc = smc_connect_clc(smc, aclc2, ini);
1015 if (rc)
1016 goto vlan_cleanup;
1017
1018 /* check if smc modes and versions of CLC proposal and accept match */
1019 rc = smc_connect_check_aclc(ini, aclc);
1020 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1021 ini->smcd_version = version;
1022 if (rc)
1023 goto vlan_cleanup;
1024
1025 /* depending on previous steps, connect using rdma or ism */
1026 if (aclc->hdr.typev1 == SMC_TYPE_R)
1027 rc = smc_connect_rdma(smc, aclc, ini);
1028 else if (aclc->hdr.typev1 == SMC_TYPE_D)
1029 rc = smc_connect_ism(smc, aclc, ini);
1030 if (rc)
1031 goto vlan_cleanup;
1032
1033 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
1034 smc_connect_ism_vlan_cleanup(smc, ini);
1035 kfree(buf);
1036 kfree(ini);
1037 return 0;
1038
1039 vlan_cleanup:
1040 smc_connect_ism_vlan_cleanup(smc, ini);
1041 kfree(buf);
1042 fallback:
1043 kfree(ini);
1044 return smc_connect_decline_fallback(smc, rc, version);
1045 }
1046
1047 static void smc_connect_work(struct work_struct *work)
1048 {
1049 struct smc_sock *smc = container_of(work, struct smc_sock,
1050 connect_work);
1051 long timeo = smc->sk.sk_sndtimeo;
1052 int rc = 0;
1053
1054 if (!timeo)
1055 timeo = MAX_SCHEDULE_TIMEOUT;
1056 lock_sock(smc->clcsock->sk);
1057 if (smc->clcsock->sk->sk_err) {
1058 smc->sk.sk_err = smc->clcsock->sk->sk_err;
1059 } else if ((1 << smc->clcsock->sk->sk_state) &
1060 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
1061 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1062 if ((rc == -EPIPE) &&
1063 ((1 << smc->clcsock->sk->sk_state) &
1064 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1065 rc = 0;
1066 }
1067 release_sock(smc->clcsock->sk);
1068 lock_sock(&smc->sk);
1069 if (rc != 0 || smc->sk.sk_err) {
1070 smc->sk.sk_state = SMC_CLOSED;
1071 if (rc == -EPIPE || rc == -EAGAIN)
1072 smc->sk.sk_err = EPIPE;
1073 else if (signal_pending(current))
1074 smc->sk.sk_err = -sock_intr_errno(timeo);
1075 sock_put(&smc->sk); /* passive closing */
1076 goto out;
1077 }
1078
1079 rc = __smc_connect(smc);
1080 if (rc < 0)
1081 smc->sk.sk_err = -rc;
1082
1083 out:
1084 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1085 if (smc->sk.sk_err) {
1086 smc->sk.sk_state_change(&smc->sk);
1087 } else { /* allow polling before and after fallback decision */
1088 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1089 smc->sk.sk_write_space(&smc->sk);
1090 }
1091 }
1092 release_sock(&smc->sk);
1093 }
1094
1095 static int smc_connect(struct socket *sock, struct sockaddr *addr,
1096 int alen, int flags)
1097 {
1098 struct sock *sk = sock->sk;
1099 struct smc_sock *smc;
1100 int rc = -EINVAL;
1101
1102 smc = smc_sk(sk);
1103
1104 /* separate smc parameter checking to be safe */
1105 if (alen < sizeof(addr->sa_family))
1106 goto out_err;
1107 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
1108 goto out_err;
1109
1110 lock_sock(sk);
1111 switch (sk->sk_state) {
1112 default:
1113 goto out;
1114 case SMC_ACTIVE:
1115 rc = -EISCONN;
1116 goto out;
1117 case SMC_INIT:
1118 break;
1119 }
1120
1121 smc_copy_sock_settings_to_clc(smc);
1122 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1123 if (smc->connect_nonblock) {
1124 rc = -EALREADY;
1125 goto out;
1126 }
1127 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1128 if (rc && rc != -EINPROGRESS)
1129 goto out;
1130
1131 sock_hold(&smc->sk); /* sock put in passive closing */
1132 if (smc->use_fallback)
1133 goto out;
1134 if (flags & O_NONBLOCK) {
1135 if (queue_work(smc_hs_wq, &smc->connect_work))
1136 smc->connect_nonblock = 1;
1137 rc = -EINPROGRESS;
1138 } else {
1139 rc = __smc_connect(smc);
1140 if (rc < 0)
1141 goto out;
1142 else
1143 rc = 0; /* success cases including fallback */
1144 }
1145
1146 out:
1147 release_sock(sk);
1148 out_err:
1149 return rc;
1150 }
1151
1152 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1153 {
1154 struct socket *new_clcsock = NULL;
1155 struct sock *lsk = &lsmc->sk;
1156 struct sock *new_sk;
1157 int rc = -EINVAL;
1158
1159 release_sock(lsk);
1160 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
1161 if (!new_sk) {
1162 rc = -ENOMEM;
1163 lsk->sk_err = ENOMEM;
1164 *new_smc = NULL;
1165 lock_sock(lsk);
1166 goto out;
1167 }
1168 *new_smc = smc_sk(new_sk);
1169
1170 mutex_lock(&lsmc->clcsock_release_lock);
1171 if (lsmc->clcsock)
1172 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
1173 mutex_unlock(&lsmc->clcsock_release_lock);
1174 lock_sock(lsk);
1175 if (rc < 0 && rc != -EAGAIN)
1176 lsk->sk_err = -rc;
1177 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
1178 new_sk->sk_prot->unhash(new_sk);
1179 if (new_clcsock)
1180 sock_release(new_clcsock);
1181 new_sk->sk_state = SMC_CLOSED;
1182 sock_set_flag(new_sk, SOCK_DEAD);
1183 sock_put(new_sk); /* final */
1184 *new_smc = NULL;
1185 goto out;
1186 }
1187
1188 /* new clcsock has inherited the smc listen-specific sk_data_ready
1189 * function; switch it back to the original sk_data_ready function
1190 */
1191 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
1192 (*new_smc)->clcsock = new_clcsock;
1193 out:
1194 return rc;
1195 }
1196
1197 /* add a just created sock to the accept queue of the listen sock as
1198 * candidate for a following socket accept call from user space
1199 */
1200 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1201 {
1202 struct smc_sock *par = smc_sk(parent);
1203
1204 sock_hold(sk); /* sock_put in smc_accept_unlink () */
1205 spin_lock(&par->accept_q_lock);
1206 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1207 spin_unlock(&par->accept_q_lock);
1208 sk_acceptq_added(parent);
1209 }
1210
1211 /* remove a socket from the accept queue of its parental listening socket */
1212 static void smc_accept_unlink(struct sock *sk)
1213 {
1214 struct smc_sock *par = smc_sk(sk)->listen_smc;
1215
1216 spin_lock(&par->accept_q_lock);
1217 list_del_init(&smc_sk(sk)->accept_q);
1218 spin_unlock(&par->accept_q_lock);
1219 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
1220 sock_put(sk); /* sock_hold in smc_accept_enqueue */
1221 }
1222
1223 /* remove a sock from the accept queue to bind it to a new socket created
1224 * for a socket accept call from user space
1225 */
1226 struct sock *smc_accept_dequeue(struct sock *parent,
1227 struct socket *new_sock)
1228 {
1229 struct smc_sock *isk, *n;
1230 struct sock *new_sk;
1231
1232 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1233 new_sk = (struct sock *)isk;
1234
1235 smc_accept_unlink(new_sk);
1236 if (new_sk->sk_state == SMC_CLOSED) {
1237 new_sk->sk_prot->unhash(new_sk);
1238 if (isk->clcsock) {
1239 sock_release(isk->clcsock);
1240 isk->clcsock = NULL;
1241 }
1242 sock_put(new_sk); /* final */
1243 continue;
1244 }
1245 if (new_sock) {
1246 sock_graft(new_sk, new_sock);
1247 if (isk->use_fallback) {
1248 smc_sk(new_sk)->clcsock->file = new_sock->file;
1249 isk->clcsock->file->private_data = isk->clcsock;
1250 }
1251 }
1252 return new_sk;
1253 }
1254 return NULL;
1255 }
1256
1257 /* clean up for a created but never accepted sock */
1258 void smc_close_non_accepted(struct sock *sk)
1259 {
1260 struct smc_sock *smc = smc_sk(sk);
1261
1262 sock_hold(sk); /* sock_put below */
1263 lock_sock(sk);
1264 if (!sk->sk_lingertime)
1265 /* wait for peer closing */
1266 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
1267 __smc_release(smc);
1268 release_sock(sk);
1269 sock_put(sk); /* sock_hold above */
1270 sock_put(sk); /* final sock_put */
1271 }
1272
1273 static int smcr_serv_conf_first_link(struct smc_sock *smc)
1274 {
1275 struct smc_link *link = smc->conn.lnk;
1276 struct smc_llc_qentry *qentry;
1277 int rc;
1278
1279 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
1280 return SMC_CLC_DECL_ERR_REGRMB;
1281
1282 /* send CONFIRM LINK request to client over the RoCE fabric */
1283 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1284 if (rc < 0)
1285 return SMC_CLC_DECL_TIMEOUT_CL;
1286
1287 /* receive CONFIRM LINK response from client over the RoCE fabric */
1288 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1289 SMC_LLC_CONFIRM_LINK);
1290 if (!qentry) {
1291 struct smc_clc_msg_decline dclc;
1292
1293 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1294 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1295 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1296 }
1297 smc_llc_save_peer_uid(qentry);
1298 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1299 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1300 if (rc)
1301 return SMC_CLC_DECL_RMBE_EC;
1302
1303 /* confirm_rkey is implicit on 1st contact */
1304 smc->conn.rmb_desc->is_conf_rkey = true;
1305
1306 smc_llc_link_active(link);
1307 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
1308
1309 /* initial contact - try to establish second link */
1310 smc_llc_srv_add_link(link);
1311 return 0;
1312 }
1313
1314 /* listen worker: finish */
1315 static void smc_listen_out(struct smc_sock *new_smc)
1316 {
1317 struct smc_sock *lsmc = new_smc->listen_smc;
1318 struct sock *newsmcsk = &new_smc->sk;
1319
1320 if (lsmc->sk.sk_state == SMC_LISTEN) {
1321 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1322 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1323 release_sock(&lsmc->sk);
1324 } else { /* no longer listening */
1325 smc_close_non_accepted(newsmcsk);
1326 }
1327
1328 /* Wake up accept */
1329 lsmc->sk.sk_data_ready(&lsmc->sk);
1330 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1331 }
1332
1333 /* listen worker: finish in state connected */
1334 static void smc_listen_out_connected(struct smc_sock *new_smc)
1335 {
1336 struct sock *newsmcsk = &new_smc->sk;
1337
1338 sk_refcnt_debug_inc(newsmcsk);
1339 if (newsmcsk->sk_state == SMC_INIT)
1340 newsmcsk->sk_state = SMC_ACTIVE;
1341
1342 smc_listen_out(new_smc);
1343 }
1344
1345 /* listen worker: finish in error state */
1346 static void smc_listen_out_err(struct smc_sock *new_smc)
1347 {
1348 struct sock *newsmcsk = &new_smc->sk;
1349 struct net *net = sock_net(newsmcsk);
1350
1351 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
1352 if (newsmcsk->sk_state == SMC_INIT)
1353 sock_put(&new_smc->sk); /* passive closing */
1354 newsmcsk->sk_state = SMC_CLOSED;
1355
1356 smc_listen_out(new_smc);
1357 }
1358
1359 /* listen worker: decline and fall back if possible */
1360 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1361 int local_first, u8 version)
1362 {
1363 /* RDMA setup failed, switch back to TCP */
1364 smc_conn_abort(new_smc, local_first);
1365 if (reason_code < 0) { /* error, no fallback possible */
1366 smc_listen_out_err(new_smc);
1367 return;
1368 }
1369 smc_switch_to_fallback(new_smc, reason_code);
1370 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1371 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
1372 smc_listen_out_err(new_smc);
1373 return;
1374 }
1375 }
1376 smc_listen_out_connected(new_smc);
1377 }
1378
1379 /* listen worker: version checking */
1380 static int smc_listen_v2_check(struct smc_sock *new_smc,
1381 struct smc_clc_msg_proposal *pclc,
1382 struct smc_init_info *ini)
1383 {
1384 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1385 struct smc_clc_v2_extension *pclc_v2_ext;
1386 int rc = SMC_CLC_DECL_PEERNOSMC;
1387
1388 ini->smc_type_v1 = pclc->hdr.typev1;
1389 ini->smc_type_v2 = pclc->hdr.typev2;
1390 ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0;
1391 if (pclc->hdr.version > SMC_V1)
1392 ini->smcd_version |=
1393 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0;
1394 if (!(ini->smcd_version & SMC_V2)) {
1395 rc = SMC_CLC_DECL_PEERNOSMC;
1396 goto out;
1397 }
1398 if (!smc_ism_is_v2_capable()) {
1399 ini->smcd_version &= ~SMC_V2;
1400 rc = SMC_CLC_DECL_NOISM2SUPP;
1401 goto out;
1402 }
1403 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1404 if (!pclc_v2_ext) {
1405 ini->smcd_version &= ~SMC_V2;
1406 rc = SMC_CLC_DECL_NOV2EXT;
1407 goto out;
1408 }
1409 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
1410 if (!pclc_smcd_v2_ext) {
1411 ini->smcd_version &= ~SMC_V2;
1412 rc = SMC_CLC_DECL_NOV2DEXT;
1413 }
1414
1415 out:
1416 if (!ini->smcd_version)
1417 return rc;
1418
1419 return 0;
1420 }
1421
1422 /* listen worker: check prefixes */
1423 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1424 struct smc_clc_msg_proposal *pclc)
1425 {
1426 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1427 struct socket *newclcsock = new_smc->clcsock;
1428
1429 if (pclc->hdr.typev1 == SMC_TYPE_N)
1430 return 0;
1431 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1432 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1433 return SMC_CLC_DECL_DIFFPREFIX;
1434
1435 return 0;
1436 }
1437
1438 /* listen worker: initialize connection and buffers */
1439 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1440 struct smc_init_info *ini)
1441 {
1442 int rc;
1443
1444 /* allocate connection / link group */
1445 rc = smc_conn_create(new_smc, ini);
1446 if (rc)
1447 return rc;
1448
1449 /* create send buffer and rmb */
1450 if (smc_buf_create(new_smc, false))
1451 return SMC_CLC_DECL_MEM;
1452
1453 return 0;
1454 }
1455
1456 /* listen worker: initialize connection and buffers for SMC-D */
1457 static int smc_listen_ism_init(struct smc_sock *new_smc,
1458 struct smc_init_info *ini)
1459 {
1460 int rc;
1461
1462 rc = smc_conn_create(new_smc, ini);
1463 if (rc)
1464 return rc;
1465
1466 /* Create send and receive buffers */
1467 rc = smc_buf_create(new_smc, true);
1468 if (rc) {
1469 smc_conn_abort(new_smc, ini->first_contact_local);
1470 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1471 SMC_CLC_DECL_MEM;
1472 }
1473
1474 return 0;
1475 }
1476
1477 static bool smc_is_already_selected(struct smcd_dev *smcd,
1478 struct smc_init_info *ini,
1479 int matches)
1480 {
1481 int i;
1482
1483 for (i = 0; i < matches; i++)
1484 if (smcd == ini->ism_dev[i])
1485 return true;
1486
1487 return false;
1488 }
1489
1490 /* check for ISM devices matching proposed ISM devices */
1491 static void smc_check_ism_v2_match(struct smc_init_info *ini,
1492 u16 proposed_chid, u64 proposed_gid,
1493 unsigned int *matches)
1494 {
1495 struct smcd_dev *smcd;
1496
1497 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1498 if (smcd->going_away)
1499 continue;
1500 if (smc_is_already_selected(smcd, ini, *matches))
1501 continue;
1502 if (smc_ism_get_chid(smcd) == proposed_chid &&
1503 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1504 ini->ism_peer_gid[*matches] = proposed_gid;
1505 ini->ism_dev[*matches] = smcd;
1506 (*matches)++;
1507 break;
1508 }
1509 }
1510 }
1511
1512 static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
1513 {
1514 if (!ini->rc)
1515 ini->rc = rc;
1516 }
1517
1518 static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
1519 struct smc_clc_msg_proposal *pclc,
1520 struct smc_init_info *ini)
1521 {
1522 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
1523 struct smc_clc_v2_extension *smc_v2_ext;
1524 struct smc_clc_msg_smcd *pclc_smcd;
1525 unsigned int matches = 0;
1526 u8 smcd_version;
1527 u8 *eid = NULL;
1528 int i, rc;
1529
1530 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
1531 goto not_found;
1532
1533 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1534 smc_v2_ext = smc_get_clc_v2_ext(pclc);
1535 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
1536 if (!smcd_v2_ext ||
1537 !smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */
1538 smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini);
1539 goto not_found;
1540 }
1541
1542 mutex_lock(&smcd_dev_list.mutex);
1543 if (pclc_smcd->ism.chid)
1544 /* check for ISM device matching proposed native ISM device */
1545 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
1546 ntohll(pclc_smcd->ism.gid), &matches);
1547 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
1548 /* check for ISM devices matching proposed non-native ISM
1549 * devices
1550 */
1551 smc_check_ism_v2_match(ini,
1552 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
1553 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
1554 &matches);
1555 }
1556 mutex_unlock(&smcd_dev_list.mutex);
1557
1558 if (ini->ism_dev[0]) {
1559 smc_ism_get_system_eid(ini->ism_dev[0], &eid);
1560 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN))
1561 goto not_found;
1562 } else {
1563 goto not_found;
1564 }
1565
1566 /* separate - outside the smcd_dev_list.lock */
1567 smcd_version = ini->smcd_version;
1568 for (i = 0; i < matches; i++) {
1569 ini->smcd_version = SMC_V2;
1570 ini->is_smcd = true;
1571 ini->ism_selected = i;
1572 rc = smc_listen_ism_init(new_smc, ini);
1573 if (rc) {
1574 smc_find_ism_store_rc(rc, ini);
1575 /* try next active ISM device */
1576 continue;
1577 }
1578 return; /* matching and usable V2 ISM device found */
1579 }
1580 /* no V2 ISM device could be initialized */
1581 ini->smcd_version = smcd_version; /* restore original value */
1582
1583 not_found:
1584 ini->smcd_version &= ~SMC_V2;
1585 ini->ism_dev[0] = NULL;
1586 ini->is_smcd = false;
1587 }
1588
1589 static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
1590 struct smc_clc_msg_proposal *pclc,
1591 struct smc_init_info *ini)
1592 {
1593 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
1594 int rc = 0;
1595
1596 /* check if ISM V1 is available */
1597 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
1598 goto not_found;
1599 ini->is_smcd = true; /* prepare ISM check */
1600 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
1601 rc = smc_find_ism_device(new_smc, ini);
1602 if (rc)
1603 goto not_found;
1604 ini->ism_selected = 0;
1605 rc = smc_listen_ism_init(new_smc, ini);
1606 if (!rc)
1607 return; /* V1 ISM device found */
1608
1609 not_found:
1610 smc_find_ism_store_rc(rc, ini);
1611 ini->ism_dev[0] = NULL;
1612 ini->is_smcd = false;
1613 }
1614
1615 /* listen worker: register buffers */
1616 static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
1617 {
1618 struct smc_connection *conn = &new_smc->conn;
1619
1620 if (!local_first) {
1621 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
1622 return SMC_CLC_DECL_ERR_REGRMB;
1623 }
1624 smc_rmb_sync_sg_for_device(&new_smc->conn);
1625
1626 return 0;
1627 }
1628
1629 static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
1630 struct smc_clc_msg_proposal *pclc,
1631 struct smc_init_info *ini)
1632 {
1633 int rc;
1634
1635 if (!smcr_indicated(ini->smc_type_v1))
1636 return SMC_CLC_DECL_NOSMCDEV;
1637
1638 /* prepare RDMA check */
1639 ini->ib_lcl = &pclc->lcl;
1640 rc = smc_find_rdma_device(new_smc, ini);
1641 if (rc) {
1642 /* no RDMA device found */
1643 if (ini->smc_type_v1 == SMC_TYPE_B)
1644 /* neither ISM nor RDMA device found */
1645 rc = SMC_CLC_DECL_NOSMCDEV;
1646 return rc;
1647 }
1648 rc = smc_listen_rdma_init(new_smc, ini);
1649 if (rc)
1650 return rc;
1651 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1652 }
1653
1654 /* determine the local device matching to proposal */
1655 static int smc_listen_find_device(struct smc_sock *new_smc,
1656 struct smc_clc_msg_proposal *pclc,
1657 struct smc_init_info *ini)
1658 {
1659 int rc;
1660
1661 /* check for ISM device matching V2 proposed device */
1662 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
1663 if (ini->ism_dev[0])
1664 return 0;
1665
1666 if (!(ini->smcd_version & SMC_V1))
1667 return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV;
1668
1669 /* check for matching IP prefix and subnet length */
1670 rc = smc_listen_prfx_check(new_smc, pclc);
1671 if (rc)
1672 return ini->rc ?: rc;
1673
1674 /* get vlan id from IP device */
1675 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
1676 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
1677
1678 /* check for ISM device matching V1 proposed device */
1679 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
1680 if (ini->ism_dev[0])
1681 return 0;
1682
1683 if (pclc->hdr.typev1 == SMC_TYPE_D)
1684 /* skip RDMA and decline */
1685 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
1686
1687 /* check if RDMA is available */
1688 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
1689 smc_find_ism_store_rc(rc, ini);
1690
1691 return (!rc) ? 0 : ini->rc;
1692 }
1693
1694 /* listen worker: finish RDMA setup */
1695 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1696 struct smc_clc_msg_accept_confirm *cclc,
1697 bool local_first)
1698 {
1699 struct smc_link *link = new_smc->conn.lnk;
1700 int reason_code = 0;
1701
1702 if (local_first)
1703 smc_link_save_peer_info(link, cclc);
1704
1705 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
1706 return SMC_CLC_DECL_ERR_RTOK;
1707
1708 if (local_first) {
1709 if (smc_ib_ready_link(link))
1710 return SMC_CLC_DECL_ERR_RDYLNK;
1711 /* QP confirmation over RoCE fabric */
1712 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
1713 reason_code = smcr_serv_conf_first_link(new_smc);
1714 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
1715 }
1716 return reason_code;
1717 }
1718
1719 /* setup for connection of server */
1720 static void smc_listen_work(struct work_struct *work)
1721 {
1722 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1723 smc_listen_work);
1724 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
1725 struct socket *newclcsock = new_smc->clcsock;
1726 struct smc_clc_msg_accept_confirm *cclc;
1727 struct smc_clc_msg_proposal_area *buf;
1728 struct smc_clc_msg_proposal *pclc;
1729 struct smc_init_info *ini = NULL;
1730 int rc = 0;
1731
1732 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1733 return smc_listen_out_err(new_smc);
1734
1735 if (new_smc->use_fallback) {
1736 smc_listen_out_connected(new_smc);
1737 return;
1738 }
1739
1740 /* check if peer is smc capable */
1741 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1742 smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
1743 smc_listen_out_connected(new_smc);
1744 return;
1745 }
1746
1747 /* do inband token exchange -
1748 * wait for and receive SMC Proposal CLC message
1749 */
1750 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1751 if (!buf) {
1752 rc = SMC_CLC_DECL_MEM;
1753 goto out_decl;
1754 }
1755 pclc = (struct smc_clc_msg_proposal *)buf;
1756 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
1757 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1758 if (rc)
1759 goto out_decl;
1760 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version;
1761
1762 /* IPSec connections opt out of SMC optimizations */
1763 if (using_ipsec(new_smc)) {
1764 rc = SMC_CLC_DECL_IPSEC;
1765 goto out_decl;
1766 }
1767
1768 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1769 if (!ini) {
1770 rc = SMC_CLC_DECL_MEM;
1771 goto out_decl;
1772 }
1773
1774 /* initial version checking */
1775 rc = smc_listen_v2_check(new_smc, pclc, ini);
1776 if (rc)
1777 goto out_decl;
1778
1779 mutex_lock(&smc_server_lgr_pending);
1780 smc_close_init(new_smc);
1781 smc_rx_init(new_smc);
1782 smc_tx_init(new_smc);
1783
1784 /* determine ISM or RoCE device used for connection */
1785 rc = smc_listen_find_device(new_smc, pclc, ini);
1786 if (rc)
1787 goto out_unlock;
1788
1789 /* send SMC Accept CLC message */
1790 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
1791 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1);
1792 if (rc)
1793 goto out_unlock;
1794
1795 /* SMC-D does not need this lock any more */
1796 if (ini->is_smcd)
1797 mutex_unlock(&smc_server_lgr_pending);
1798
1799 /* receive SMC Confirm CLC message */
1800 memset(buf, 0, sizeof(*buf));
1801 cclc = (struct smc_clc_msg_accept_confirm *)buf;
1802 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
1803 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1804 if (rc) {
1805 if (!ini->is_smcd)
1806 goto out_unlock;
1807 goto out_decl;
1808 }
1809
1810 /* finish worker */
1811 if (!ini->is_smcd) {
1812 rc = smc_listen_rdma_finish(new_smc, cclc,
1813 ini->first_contact_local);
1814 if (rc)
1815 goto out_unlock;
1816 mutex_unlock(&smc_server_lgr_pending);
1817 }
1818 smc_conn_save_peer_info(new_smc, cclc);
1819 smc_listen_out_connected(new_smc);
1820 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
1821 goto out_free;
1822
1823 out_unlock:
1824 mutex_unlock(&smc_server_lgr_pending);
1825 out_decl:
1826 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
1827 version);
1828 out_free:
1829 kfree(ini);
1830 kfree(buf);
1831 }
1832
1833 static void smc_tcp_listen_work(struct work_struct *work)
1834 {
1835 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1836 tcp_listen_work);
1837 struct sock *lsk = &lsmc->sk;
1838 struct smc_sock *new_smc;
1839 int rc = 0;
1840
1841 lock_sock(lsk);
1842 while (lsk->sk_state == SMC_LISTEN) {
1843 rc = smc_clcsock_accept(lsmc, &new_smc);
1844 if (rc) /* clcsock accept queue empty or error */
1845 goto out;
1846 if (!new_smc)
1847 continue;
1848
1849 new_smc->listen_smc = lsmc;
1850 new_smc->use_fallback = lsmc->use_fallback;
1851 new_smc->fallback_rsn = lsmc->fallback_rsn;
1852 sock_hold(lsk); /* sock_put in smc_listen_work */
1853 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1854 smc_copy_sock_settings_to_smc(new_smc);
1855 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1856 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1857 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1858 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
1859 sock_put(&new_smc->sk);
1860 }
1861
1862 out:
1863 release_sock(lsk);
1864 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
1865 }
1866
1867 static void smc_clcsock_data_ready(struct sock *listen_clcsock)
1868 {
1869 struct smc_sock *lsmc;
1870
1871 lsmc = (struct smc_sock *)
1872 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY);
1873 if (!lsmc)
1874 return;
1875 lsmc->clcsk_data_ready(listen_clcsock);
1876 if (lsmc->sk.sk_state == SMC_LISTEN) {
1877 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
1878 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work))
1879 sock_put(&lsmc->sk);
1880 }
1881 }
1882
1883 static int smc_listen(struct socket *sock, int backlog)
1884 {
1885 struct sock *sk = sock->sk;
1886 struct smc_sock *smc;
1887 int rc;
1888
1889 smc = smc_sk(sk);
1890 lock_sock(sk);
1891
1892 rc = -EINVAL;
1893 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1894 smc->connect_nonblock)
1895 goto out;
1896
1897 rc = 0;
1898 if (sk->sk_state == SMC_LISTEN) {
1899 sk->sk_max_ack_backlog = backlog;
1900 goto out;
1901 }
1902 /* some socket options are handled in core, so we could not apply
1903 * them to the clc socket -- copy smc socket options to clc socket
1904 */
1905 smc_copy_sock_settings_to_clc(smc);
1906 if (!smc->use_fallback)
1907 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1908
1909 /* save original sk_data_ready function and establish
1910 * smc-specific sk_data_ready function
1911 */
1912 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready;
1913 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready;
1914 smc->clcsock->sk->sk_user_data =
1915 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
1916 rc = kernel_listen(smc->clcsock, backlog);
1917 if (rc)
1918 goto out;
1919 sk->sk_max_ack_backlog = backlog;
1920 sk->sk_ack_backlog = 0;
1921 sk->sk_state = SMC_LISTEN;
1922
1923 out:
1924 release_sock(sk);
1925 return rc;
1926 }
1927
1928 static int smc_accept(struct socket *sock, struct socket *new_sock,
1929 int flags, bool kern)
1930 {
1931 struct sock *sk = sock->sk, *nsk;
1932 DECLARE_WAITQUEUE(wait, current);
1933 struct smc_sock *lsmc;
1934 long timeo;
1935 int rc = 0;
1936
1937 lsmc = smc_sk(sk);
1938 sock_hold(sk); /* sock_put below */
1939 lock_sock(sk);
1940
1941 if (lsmc->sk.sk_state != SMC_LISTEN) {
1942 rc = -EINVAL;
1943 release_sock(sk);
1944 goto out;
1945 }
1946
1947 /* Wait for an incoming connection */
1948 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1949 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1950 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1951 set_current_state(TASK_INTERRUPTIBLE);
1952 if (!timeo) {
1953 rc = -EAGAIN;
1954 break;
1955 }
1956 release_sock(sk);
1957 timeo = schedule_timeout(timeo);
1958 /* wakeup by sk_data_ready in smc_listen_work() */
1959 sched_annotate_sleep();
1960 lock_sock(sk);
1961 if (signal_pending(current)) {
1962 rc = sock_intr_errno(timeo);
1963 break;
1964 }
1965 }
1966 set_current_state(TASK_RUNNING);
1967 remove_wait_queue(sk_sleep(sk), &wait);
1968
1969 if (!rc)
1970 rc = sock_error(nsk);
1971 release_sock(sk);
1972 if (rc)
1973 goto out;
1974
1975 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1976 /* wait till data arrives on the socket */
1977 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1978 MSEC_PER_SEC);
1979 if (smc_sk(nsk)->use_fallback) {
1980 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1981
1982 lock_sock(clcsk);
1983 if (skb_queue_empty(&clcsk->sk_receive_queue))
1984 sk_wait_data(clcsk, &timeo, NULL);
1985 release_sock(clcsk);
1986 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1987 lock_sock(nsk);
1988 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1989 release_sock(nsk);
1990 }
1991 }
1992
1993 out:
1994 sock_put(sk); /* sock_hold above */
1995 return rc;
1996 }
1997
1998 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1999 int peer)
2000 {
2001 struct smc_sock *smc;
2002
2003 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2004 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
2005 return -ENOTCONN;
2006
2007 smc = smc_sk(sock->sk);
2008
2009 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
2010 }
2011
2012 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2013 {
2014 struct sock *sk = sock->sk;
2015 struct smc_sock *smc;
2016 int rc = -EPIPE;
2017
2018 smc = smc_sk(sk);
2019 lock_sock(sk);
2020 if ((sk->sk_state != SMC_ACTIVE) &&
2021 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2022 (sk->sk_state != SMC_INIT))
2023 goto out;
2024
2025 if (msg->msg_flags & MSG_FASTOPEN) {
2026 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2027 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2028 } else {
2029 rc = -EINVAL;
2030 goto out;
2031 }
2032 }
2033
2034 if (smc->use_fallback) {
2035 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
2036 } else {
2037 rc = smc_tx_sendmsg(smc, msg, len);
2038 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2039 }
2040 out:
2041 release_sock(sk);
2042 return rc;
2043 }
2044
2045 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2046 int flags)
2047 {
2048 struct sock *sk = sock->sk;
2049 struct smc_sock *smc;
2050 int rc = -ENOTCONN;
2051
2052 smc = smc_sk(sk);
2053 lock_sock(sk);
2054 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2055 /* socket was connected before, no more data to read */
2056 rc = 0;
2057 goto out;
2058 }
2059 if ((sk->sk_state == SMC_INIT) ||
2060 (sk->sk_state == SMC_LISTEN) ||
2061 (sk->sk_state == SMC_CLOSED))
2062 goto out;
2063
2064 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2065 rc = 0;
2066 goto out;
2067 }
2068
2069 if (smc->use_fallback) {
2070 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
2071 } else {
2072 msg->msg_namelen = 0;
2073 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
2074 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
2075 }
2076
2077 out:
2078 release_sock(sk);
2079 return rc;
2080 }
2081
2082 static __poll_t smc_accept_poll(struct sock *parent)
2083 {
2084 struct smc_sock *isk = smc_sk(parent);
2085 __poll_t mask = 0;
2086
2087 spin_lock(&isk->accept_q_lock);
2088 if (!list_empty(&isk->accept_q))
2089 mask = EPOLLIN | EPOLLRDNORM;
2090 spin_unlock(&isk->accept_q_lock);
2091
2092 return mask;
2093 }
2094
2095 static __poll_t smc_poll(struct file *file, struct socket *sock,
2096 poll_table *wait)
2097 {
2098 struct sock *sk = sock->sk;
2099 struct smc_sock *smc;
2100 __poll_t mask = 0;
2101
2102 if (!sk)
2103 return EPOLLNVAL;
2104
2105 smc = smc_sk(sock->sk);
2106 if (smc->use_fallback) {
2107 /* delegate to CLC child sock */
2108 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
2109 sk->sk_err = smc->clcsock->sk->sk_err;
2110 } else {
2111 if (sk->sk_state != SMC_CLOSED)
2112 sock_poll_wait(file, sock, wait);
2113 if (sk->sk_err)
2114 mask |= EPOLLERR;
2115 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2116 (sk->sk_state == SMC_CLOSED))
2117 mask |= EPOLLHUP;
2118 if (sk->sk_state == SMC_LISTEN) {
2119 /* woken up by sk_data_ready in smc_listen_work() */
2120 mask |= smc_accept_poll(sk);
2121 } else if (smc->use_fallback) { /* as result of connect_work()*/
2122 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2123 wait);
2124 sk->sk_err = smc->clcsock->sk->sk_err;
2125 } else {
2126 if ((sk->sk_state != SMC_INIT &&
2127 atomic_read(&smc->conn.sndbuf_space)) ||
2128 sk->sk_shutdown & SEND_SHUTDOWN) {
2129 mask |= EPOLLOUT | EPOLLWRNORM;
2130 } else {
2131 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2132 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2133 }
2134 if (atomic_read(&smc->conn.bytes_to_rcv))
2135 mask |= EPOLLIN | EPOLLRDNORM;
2136 if (sk->sk_shutdown & RCV_SHUTDOWN)
2137 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
2138 if (sk->sk_state == SMC_APPCLOSEWAIT1)
2139 mask |= EPOLLIN;
2140 if (smc->conn.urg_state == SMC_URG_VALID)
2141 mask |= EPOLLPRI;
2142 }
2143 }
2144
2145 return mask;
2146 }
2147
2148 static int smc_shutdown(struct socket *sock, int how)
2149 {
2150 struct sock *sk = sock->sk;
2151 struct smc_sock *smc;
2152 int rc = -EINVAL;
2153 int rc1 = 0;
2154
2155 smc = smc_sk(sk);
2156
2157 if ((how < SHUT_RD) || (how > SHUT_RDWR))
2158 return rc;
2159
2160 lock_sock(sk);
2161
2162 rc = -ENOTCONN;
2163 if ((sk->sk_state != SMC_ACTIVE) &&
2164 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2165 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2166 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2167 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2168 (sk->sk_state != SMC_APPFINCLOSEWAIT))
2169 goto out;
2170 if (smc->use_fallback) {
2171 rc = kernel_sock_shutdown(smc->clcsock, how);
2172 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2173 if (sk->sk_shutdown == SHUTDOWN_MASK)
2174 sk->sk_state = SMC_CLOSED;
2175 goto out;
2176 }
2177 switch (how) {
2178 case SHUT_RDWR: /* shutdown in both directions */
2179 rc = smc_close_active(smc);
2180 break;
2181 case SHUT_WR:
2182 rc = smc_close_shutdown_write(smc);
2183 break;
2184 case SHUT_RD:
2185 rc = 0;
2186 /* nothing more to do because peer is not involved */
2187 break;
2188 }
2189 if (smc->clcsock)
2190 rc1 = kernel_sock_shutdown(smc->clcsock, how);
2191 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2192 sk->sk_shutdown |= how + 1;
2193
2194 out:
2195 release_sock(sk);
2196 return rc ? rc : rc1;
2197 }
2198
2199 static int smc_setsockopt(struct socket *sock, int level, int optname,
2200 sockptr_t optval, unsigned int optlen)
2201 {
2202 struct sock *sk = sock->sk;
2203 struct smc_sock *smc;
2204 int val, rc;
2205
2206 if (level == SOL_TCP && optname == TCP_ULP)
2207 return -EOPNOTSUPP;
2208
2209 smc = smc_sk(sk);
2210
2211 /* generic setsockopts reaching us here always apply to the
2212 * CLC socket
2213 */
2214 if (unlikely(!smc->clcsock->ops->setsockopt))
2215 rc = -EOPNOTSUPP;
2216 else
2217 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2218 optval, optlen);
2219 if (smc->clcsock->sk->sk_err) {
2220 sk->sk_err = smc->clcsock->sk->sk_err;
2221 sk_error_report(sk);
2222 }
2223
2224 if (optlen < sizeof(int))
2225 return -EINVAL;
2226 if (copy_from_sockptr(&val, optval, sizeof(int)))
2227 return -EFAULT;
2228
2229 lock_sock(sk);
2230 if (rc || smc->use_fallback)
2231 goto out;
2232 switch (optname) {
2233 case TCP_FASTOPEN:
2234 case TCP_FASTOPEN_CONNECT:
2235 case TCP_FASTOPEN_KEY:
2236 case TCP_FASTOPEN_NO_COOKIE:
2237 /* option not supported by SMC */
2238 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
2239 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2240 } else {
2241 rc = -EINVAL;
2242 }
2243 break;
2244 case TCP_NODELAY:
2245 if (sk->sk_state != SMC_INIT &&
2246 sk->sk_state != SMC_LISTEN &&
2247 sk->sk_state != SMC_CLOSED) {
2248 if (val) {
2249 SMC_STAT_INC(smc, ndly_cnt);
2250 mod_delayed_work(smc->conn.lgr->tx_wq,
2251 &smc->conn.tx_work, 0);
2252 }
2253 }
2254 break;
2255 case TCP_CORK:
2256 if (sk->sk_state != SMC_INIT &&
2257 sk->sk_state != SMC_LISTEN &&
2258 sk->sk_state != SMC_CLOSED) {
2259 if (!val) {
2260 SMC_STAT_INC(smc, cork_cnt);
2261 mod_delayed_work(smc->conn.lgr->tx_wq,
2262 &smc->conn.tx_work, 0);
2263 }
2264 }
2265 break;
2266 case TCP_DEFER_ACCEPT:
2267 smc->sockopt_defer_accept = val;
2268 break;
2269 default:
2270 break;
2271 }
2272 out:
2273 release_sock(sk);
2274
2275 return rc;
2276 }
2277
2278 static int smc_getsockopt(struct socket *sock, int level, int optname,
2279 char __user *optval, int __user *optlen)
2280 {
2281 struct smc_sock *smc;
2282
2283 smc = smc_sk(sock->sk);
2284 /* socket options apply to the CLC socket */
2285 if (unlikely(!smc->clcsock->ops->getsockopt))
2286 return -EOPNOTSUPP;
2287 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2288 optval, optlen);
2289 }
2290
2291 static int smc_ioctl(struct socket *sock, unsigned int cmd,
2292 unsigned long arg)
2293 {
2294 union smc_host_cursor cons, urg;
2295 struct smc_connection *conn;
2296 struct smc_sock *smc;
2297 int answ;
2298
2299 smc = smc_sk(sock->sk);
2300 conn = &smc->conn;
2301 lock_sock(&smc->sk);
2302 if (smc->use_fallback) {
2303 if (!smc->clcsock) {
2304 release_sock(&smc->sk);
2305 return -EBADF;
2306 }
2307 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2308 release_sock(&smc->sk);
2309 return answ;
2310 }
2311 switch (cmd) {
2312 case SIOCINQ: /* same as FIONREAD */
2313 if (smc->sk.sk_state == SMC_LISTEN) {
2314 release_sock(&smc->sk);
2315 return -EINVAL;
2316 }
2317 if (smc->sk.sk_state == SMC_INIT ||
2318 smc->sk.sk_state == SMC_CLOSED)
2319 answ = 0;
2320 else
2321 answ = atomic_read(&smc->conn.bytes_to_rcv);
2322 break;
2323 case SIOCOUTQ:
2324 /* output queue size (not send + not acked) */
2325 if (smc->sk.sk_state == SMC_LISTEN) {
2326 release_sock(&smc->sk);
2327 return -EINVAL;
2328 }
2329 if (smc->sk.sk_state == SMC_INIT ||
2330 smc->sk.sk_state == SMC_CLOSED)
2331 answ = 0;
2332 else
2333 answ = smc->conn.sndbuf_desc->len -
2334 atomic_read(&smc->conn.sndbuf_space);
2335 break;
2336 case SIOCOUTQNSD:
2337 /* output queue size (not send only) */
2338 if (smc->sk.sk_state == SMC_LISTEN) {
2339 release_sock(&smc->sk);
2340 return -EINVAL;
2341 }
2342 if (smc->sk.sk_state == SMC_INIT ||
2343 smc->sk.sk_state == SMC_CLOSED)
2344 answ = 0;
2345 else
2346 answ = smc_tx_prepared_sends(&smc->conn);
2347 break;
2348 case SIOCATMARK:
2349 if (smc->sk.sk_state == SMC_LISTEN) {
2350 release_sock(&smc->sk);
2351 return -EINVAL;
2352 }
2353 if (smc->sk.sk_state == SMC_INIT ||
2354 smc->sk.sk_state == SMC_CLOSED) {
2355 answ = 0;
2356 } else {
2357 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
2358 smc_curs_copy(&urg, &conn->urg_curs, conn);
2359 answ = smc_curs_diff(conn->rmb_desc->len,
2360 &cons, &urg) == 1;
2361 }
2362 break;
2363 default:
2364 release_sock(&smc->sk);
2365 return -ENOIOCTLCMD;
2366 }
2367 release_sock(&smc->sk);
2368
2369 return put_user(answ, (int __user *)arg);
2370 }
2371
2372 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
2373 int offset, size_t size, int flags)
2374 {
2375 struct sock *sk = sock->sk;
2376 struct smc_sock *smc;
2377 int rc = -EPIPE;
2378
2379 smc = smc_sk(sk);
2380 lock_sock(sk);
2381 if (sk->sk_state != SMC_ACTIVE) {
2382 release_sock(sk);
2383 goto out;
2384 }
2385 release_sock(sk);
2386 if (smc->use_fallback) {
2387 rc = kernel_sendpage(smc->clcsock, page, offset,
2388 size, flags);
2389 } else {
2390 SMC_STAT_INC(smc, sendpage_cnt);
2391 rc = sock_no_sendpage(sock, page, offset, size, flags);
2392 }
2393
2394 out:
2395 return rc;
2396 }
2397
2398 /* Map the affected portions of the rmbe into an spd, note the number of bytes
2399 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
2400 * updates till whenever a respective page has been fully processed.
2401 * Note that subsequent recv() calls have to wait till all splice() processing
2402 * completed.
2403 */
2404 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
2405 struct pipe_inode_info *pipe, size_t len,
2406 unsigned int flags)
2407 {
2408 struct sock *sk = sock->sk;
2409 struct smc_sock *smc;
2410 int rc = -ENOTCONN;
2411
2412 smc = smc_sk(sk);
2413 lock_sock(sk);
2414 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2415 /* socket was connected before, no more data to read */
2416 rc = 0;
2417 goto out;
2418 }
2419 if (sk->sk_state == SMC_INIT ||
2420 sk->sk_state == SMC_LISTEN ||
2421 sk->sk_state == SMC_CLOSED)
2422 goto out;
2423
2424 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2425 rc = 0;
2426 goto out;
2427 }
2428
2429 if (smc->use_fallback) {
2430 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
2431 pipe, len, flags);
2432 } else {
2433 if (*ppos) {
2434 rc = -ESPIPE;
2435 goto out;
2436 }
2437 if (flags & SPLICE_F_NONBLOCK)
2438 flags = MSG_DONTWAIT;
2439 else
2440 flags = 0;
2441 SMC_STAT_INC(smc, splice_cnt);
2442 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
2443 }
2444 out:
2445 release_sock(sk);
2446
2447 return rc;
2448 }
2449
2450 /* must look like tcp */
2451 static const struct proto_ops smc_sock_ops = {
2452 .family = PF_SMC,
2453 .owner = THIS_MODULE,
2454 .release = smc_release,
2455 .bind = smc_bind,
2456 .connect = smc_connect,
2457 .socketpair = sock_no_socketpair,
2458 .accept = smc_accept,
2459 .getname = smc_getname,
2460 .poll = smc_poll,
2461 .ioctl = smc_ioctl,
2462 .listen = smc_listen,
2463 .shutdown = smc_shutdown,
2464 .setsockopt = smc_setsockopt,
2465 .getsockopt = smc_getsockopt,
2466 .sendmsg = smc_sendmsg,
2467 .recvmsg = smc_recvmsg,
2468 .mmap = sock_no_mmap,
2469 .sendpage = smc_sendpage,
2470 .splice_read = smc_splice_read,
2471 };
2472
2473 static int smc_create(struct net *net, struct socket *sock, int protocol,
2474 int kern)
2475 {
2476 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
2477 struct smc_sock *smc;
2478 struct sock *sk;
2479 int rc;
2480
2481 rc = -ESOCKTNOSUPPORT;
2482 if (sock->type != SOCK_STREAM)
2483 goto out;
2484
2485 rc = -EPROTONOSUPPORT;
2486 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
2487 goto out;
2488
2489 rc = -ENOBUFS;
2490 sock->ops = &smc_sock_ops;
2491 sk = smc_sock_alloc(net, sock, protocol);
2492 if (!sk)
2493 goto out;
2494
2495 /* create internal TCP socket for CLC handshake and fallback */
2496 smc = smc_sk(sk);
2497 smc->use_fallback = false; /* assume rdma capability first */
2498 smc->fallback_rsn = 0;
2499 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2500 &smc->clcsock);
2501 if (rc) {
2502 sk_common_release(sk);
2503 goto out;
2504 }
2505 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2506 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
2507
2508 out:
2509 return rc;
2510 }
2511
2512 static const struct net_proto_family smc_sock_family_ops = {
2513 .family = PF_SMC,
2514 .owner = THIS_MODULE,
2515 .create = smc_create,
2516 };
2517
2518 unsigned int smc_net_id;
2519
2520 static __net_init int smc_net_init(struct net *net)
2521 {
2522 return smc_pnet_net_init(net);
2523 }
2524
2525 static void __net_exit smc_net_exit(struct net *net)
2526 {
2527 smc_pnet_net_exit(net);
2528 }
2529
2530 static __net_init int smc_net_stat_init(struct net *net)
2531 {
2532 return smc_stats_init(net);
2533 }
2534
2535 static void __net_exit smc_net_stat_exit(struct net *net)
2536 {
2537 smc_stats_exit(net);
2538 }
2539
2540 static struct pernet_operations smc_net_ops = {
2541 .init = smc_net_init,
2542 .exit = smc_net_exit,
2543 .id = &smc_net_id,
2544 .size = sizeof(struct smc_net),
2545 };
2546
2547 static struct pernet_operations smc_net_stat_ops = {
2548 .init = smc_net_stat_init,
2549 .exit = smc_net_stat_exit,
2550 };
2551
2552 static int __init smc_init(void)
2553 {
2554 int rc;
2555
2556 rc = register_pernet_subsys(&smc_net_ops);
2557 if (rc)
2558 return rc;
2559
2560 rc = register_pernet_subsys(&smc_net_stat_ops);
2561 if (rc)
2562 return rc;
2563
2564 smc_ism_init();
2565 smc_clc_init();
2566
2567 rc = smc_nl_init();
2568 if (rc)
2569 goto out_pernet_subsys;
2570
2571 rc = smc_pnet_init();
2572 if (rc)
2573 goto out_nl;
2574
2575 rc = -ENOMEM;
2576 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
2577 if (!smc_hs_wq)
2578 goto out_pnet;
2579
2580 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
2581 if (!smc_close_wq)
2582 goto out_alloc_hs_wq;
2583
2584 rc = smc_core_init();
2585 if (rc) {
2586 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
2587 goto out_alloc_wqs;
2588 }
2589
2590 rc = smc_llc_init();
2591 if (rc) {
2592 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2593 goto out_core;
2594 }
2595
2596 rc = smc_cdc_init();
2597 if (rc) {
2598 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2599 goto out_core;
2600 }
2601
2602 rc = proto_register(&smc_proto, 1);
2603 if (rc) {
2604 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2605 goto out_core;
2606 }
2607
2608 rc = proto_register(&smc_proto6, 1);
2609 if (rc) {
2610 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2611 goto out_proto;
2612 }
2613
2614 rc = sock_register(&smc_sock_family_ops);
2615 if (rc) {
2616 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2617 goto out_proto6;
2618 }
2619 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2620 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2621
2622 rc = smc_ib_register_client();
2623 if (rc) {
2624 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2625 goto out_sock;
2626 }
2627
2628 static_branch_enable(&tcp_have_smc);
2629 return 0;
2630
2631 out_sock:
2632 sock_unregister(PF_SMC);
2633 out_proto6:
2634 proto_unregister(&smc_proto6);
2635 out_proto:
2636 proto_unregister(&smc_proto);
2637 out_core:
2638 smc_core_exit();
2639 out_alloc_wqs:
2640 destroy_workqueue(smc_close_wq);
2641 out_alloc_hs_wq:
2642 destroy_workqueue(smc_hs_wq);
2643 out_pnet:
2644 smc_pnet_exit();
2645 out_nl:
2646 smc_nl_exit();
2647 out_pernet_subsys:
2648 unregister_pernet_subsys(&smc_net_ops);
2649
2650 return rc;
2651 }
2652
2653 static void __exit smc_exit(void)
2654 {
2655 static_branch_disable(&tcp_have_smc);
2656 sock_unregister(PF_SMC);
2657 smc_core_exit();
2658 smc_ib_unregister_client();
2659 destroy_workqueue(smc_close_wq);
2660 destroy_workqueue(smc_hs_wq);
2661 proto_unregister(&smc_proto6);
2662 proto_unregister(&smc_proto);
2663 smc_pnet_exit();
2664 smc_nl_exit();
2665 unregister_pernet_subsys(&smc_net_stat_ops);
2666 unregister_pernet_subsys(&smc_net_ops);
2667 rcu_barrier();
2668 }
2669
2670 module_init(smc_init);
2671 module_exit(smc_exit);
2672
2673 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2674 MODULE_DESCRIPTION("smc socket address family");
2675 MODULE_LICENSE("GPL");
2676 MODULE_ALIAS_NETPROTO(PF_SMC);
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