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