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Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
[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 a new rmb, send confirm_rkey msg to register with peer */
341 static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
342 bool conf_rkey)
343 {
344 if (!rmb_desc->wr_reg) {
345 /* register memory region for new rmb */
346 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
347 rmb_desc->regerr = 1;
348 return -EFAULT;
349 }
350 rmb_desc->wr_reg = 1;
351 }
352 if (!conf_rkey)
353 return 0;
354 /* exchange confirm_rkey msg with peer */
355 if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
356 rmb_desc->regerr = 1;
357 return -EFAULT;
358 }
359 return 0;
360 }
361
362 static int smc_clnt_conf_first_link(struct smc_sock *smc)
363 {
364 struct net *net = sock_net(smc->clcsock->sk);
365 struct smc_link_group *lgr = smc->conn.lgr;
366 struct smc_link *link;
367 int rest;
368 int rc;
369
370 link = &lgr->lnk[SMC_SINGLE_LINK];
371 /* receive CONFIRM LINK request from server over RoCE fabric */
372 rest = wait_for_completion_interruptible_timeout(
373 &link->llc_confirm,
374 SMC_LLC_WAIT_FIRST_TIME);
375 if (rest <= 0) {
376 struct smc_clc_msg_decline dclc;
377
378 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
379 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
380 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
381 }
382
383 if (link->llc_confirm_rc)
384 return SMC_CLC_DECL_RMBE_EC;
385
386 rc = smc_ib_modify_qp_rts(link);
387 if (rc)
388 return SMC_CLC_DECL_ERR_RDYLNK;
389
390 smc_wr_remember_qp_attr(link);
391
392 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
393 return SMC_CLC_DECL_ERR_REGRMB;
394
395 /* send CONFIRM LINK response over RoCE fabric */
396 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
397 if (rc < 0)
398 return SMC_CLC_DECL_TIMEOUT_CL;
399
400 /* receive ADD LINK request from server over RoCE fabric */
401 rest = wait_for_completion_interruptible_timeout(&link->llc_add,
402 SMC_LLC_WAIT_TIME);
403 if (rest <= 0) {
404 struct smc_clc_msg_decline dclc;
405
406 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
407 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
408 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
409 }
410
411 /* send add link reject message, only one link supported for now */
412 rc = smc_llc_send_add_link(link,
413 link->smcibdev->mac[link->ibport - 1],
414 link->gid, SMC_LLC_RESP);
415 if (rc < 0)
416 return SMC_CLC_DECL_TIMEOUT_AL;
417
418 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
419
420 return 0;
421 }
422
423 static void smcr_conn_save_peer_info(struct smc_sock *smc,
424 struct smc_clc_msg_accept_confirm *clc)
425 {
426 int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
427
428 smc->conn.peer_rmbe_idx = clc->rmbe_idx;
429 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
430 smc->conn.peer_rmbe_size = bufsize;
431 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
432 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
433 }
434
435 static void smcd_conn_save_peer_info(struct smc_sock *smc,
436 struct smc_clc_msg_accept_confirm *clc)
437 {
438 int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
439
440 smc->conn.peer_rmbe_idx = clc->dmbe_idx;
441 smc->conn.peer_token = clc->token;
442 /* msg header takes up space in the buffer */
443 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
444 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
445 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
446 }
447
448 static void smc_conn_save_peer_info(struct smc_sock *smc,
449 struct smc_clc_msg_accept_confirm *clc)
450 {
451 if (smc->conn.lgr->is_smcd)
452 smcd_conn_save_peer_info(smc, clc);
453 else
454 smcr_conn_save_peer_info(smc, clc);
455 }
456
457 static void smc_link_save_peer_info(struct smc_link *link,
458 struct smc_clc_msg_accept_confirm *clc)
459 {
460 link->peer_qpn = ntoh24(clc->qpn);
461 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
462 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
463 link->peer_psn = ntoh24(clc->psn);
464 link->peer_mtu = clc->qp_mtu;
465 }
466
467 static void smc_switch_to_fallback(struct smc_sock *smc)
468 {
469 smc->use_fallback = true;
470 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
471 smc->clcsock->file = smc->sk.sk_socket->file;
472 smc->clcsock->file->private_data = smc->clcsock;
473 }
474 }
475
476 /* fall back during connect */
477 static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
478 {
479 smc_switch_to_fallback(smc);
480 smc->fallback_rsn = reason_code;
481 smc_copy_sock_settings_to_clc(smc);
482 smc->connect_nonblock = 0;
483 if (smc->sk.sk_state == SMC_INIT)
484 smc->sk.sk_state = SMC_ACTIVE;
485 return 0;
486 }
487
488 /* decline and fall back during connect */
489 static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
490 {
491 int rc;
492
493 if (reason_code < 0) { /* error, fallback is not possible */
494 if (smc->sk.sk_state == SMC_INIT)
495 sock_put(&smc->sk); /* passive closing */
496 return reason_code;
497 }
498 if (reason_code != SMC_CLC_DECL_PEERDECL) {
499 rc = smc_clc_send_decline(smc, reason_code);
500 if (rc < 0) {
501 if (smc->sk.sk_state == SMC_INIT)
502 sock_put(&smc->sk); /* passive closing */
503 return rc;
504 }
505 }
506 return smc_connect_fallback(smc, reason_code);
507 }
508
509 /* abort connecting */
510 static int smc_connect_abort(struct smc_sock *smc, int reason_code,
511 int local_contact)
512 {
513 if (local_contact == SMC_FIRST_CONTACT)
514 smc_lgr_forget(smc->conn.lgr);
515 if (smc->conn.lgr->is_smcd)
516 /* there is only one lgr role for SMC-D; use server lock */
517 mutex_unlock(&smc_server_lgr_pending);
518 else
519 mutex_unlock(&smc_client_lgr_pending);
520
521 smc_conn_free(&smc->conn);
522 smc->connect_nonblock = 0;
523 return reason_code;
524 }
525
526 /* check if there is a rdma device available for this connection. */
527 /* called for connect and listen */
528 static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
529 {
530 /* PNET table look up: search active ib_device and port
531 * within same PNETID that also contains the ethernet device
532 * used for the internal TCP socket
533 */
534 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
535 if (!ini->ib_dev)
536 return SMC_CLC_DECL_NOSMCRDEV;
537 return 0;
538 }
539
540 /* check if there is an ISM device available for this connection. */
541 /* called for connect and listen */
542 static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
543 {
544 /* Find ISM device with same PNETID as connecting interface */
545 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
546 if (!ini->ism_dev)
547 return SMC_CLC_DECL_NOSMCDDEV;
548 return 0;
549 }
550
551 /* Check for VLAN ID and register it on ISM device just for CLC handshake */
552 static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
553 struct smc_init_info *ini)
554 {
555 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id))
556 return SMC_CLC_DECL_ISMVLANERR;
557 return 0;
558 }
559
560 /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
561 * used, the VLAN ID will be registered again during the connection setup.
562 */
563 static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
564 struct smc_init_info *ini)
565 {
566 if (!is_smcd)
567 return 0;
568 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id))
569 return SMC_CLC_DECL_CNFERR;
570 return 0;
571 }
572
573 /* CLC handshake during connect */
574 static int smc_connect_clc(struct smc_sock *smc, int smc_type,
575 struct smc_clc_msg_accept_confirm *aclc,
576 struct smc_init_info *ini)
577 {
578 int rc = 0;
579
580 /* do inband token exchange */
581 rc = smc_clc_send_proposal(smc, smc_type, ini);
582 if (rc)
583 return rc;
584 /* receive SMC Accept CLC message */
585 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
586 CLC_WAIT_TIME);
587 }
588
589 /* setup for RDMA connection of client */
590 static int smc_connect_rdma(struct smc_sock *smc,
591 struct smc_clc_msg_accept_confirm *aclc,
592 struct smc_init_info *ini)
593 {
594 struct smc_link *link;
595 int reason_code = 0;
596
597 ini->is_smcd = false;
598 ini->ib_lcl = &aclc->lcl;
599 ini->ib_clcqpn = ntoh24(aclc->qpn);
600 ini->srv_first_contact = aclc->hdr.flag;
601
602 mutex_lock(&smc_client_lgr_pending);
603 reason_code = smc_conn_create(smc, ini);
604 if (reason_code) {
605 mutex_unlock(&smc_client_lgr_pending);
606 return reason_code;
607 }
608 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
609
610 smc_conn_save_peer_info(smc, aclc);
611
612 /* create send buffer and rmb */
613 if (smc_buf_create(smc, false))
614 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
615 ini->cln_first_contact);
616
617 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
618 smc_link_save_peer_info(link, aclc);
619
620 if (smc_rmb_rtoken_handling(&smc->conn, aclc))
621 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
622 ini->cln_first_contact);
623
624 smc_close_init(smc);
625 smc_rx_init(smc);
626
627 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
628 if (smc_ib_ready_link(link))
629 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
630 ini->cln_first_contact);
631 } else {
632 if (smc_reg_rmb(link, smc->conn.rmb_desc, true))
633 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
634 ini->cln_first_contact);
635 }
636 smc_rmb_sync_sg_for_device(&smc->conn);
637
638 reason_code = smc_clc_send_confirm(smc);
639 if (reason_code)
640 return smc_connect_abort(smc, reason_code,
641 ini->cln_first_contact);
642
643 smc_tx_init(smc);
644
645 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
646 /* QP confirmation over RoCE fabric */
647 reason_code = smc_clnt_conf_first_link(smc);
648 if (reason_code)
649 return smc_connect_abort(smc, reason_code,
650 ini->cln_first_contact);
651 }
652 mutex_unlock(&smc_client_lgr_pending);
653
654 smc_copy_sock_settings_to_clc(smc);
655 smc->connect_nonblock = 0;
656 if (smc->sk.sk_state == SMC_INIT)
657 smc->sk.sk_state = SMC_ACTIVE;
658
659 return 0;
660 }
661
662 /* setup for ISM connection of client */
663 static int smc_connect_ism(struct smc_sock *smc,
664 struct smc_clc_msg_accept_confirm *aclc,
665 struct smc_init_info *ini)
666 {
667 int rc = 0;
668
669 ini->is_smcd = true;
670 ini->ism_gid = aclc->gid;
671 ini->srv_first_contact = aclc->hdr.flag;
672
673 /* there is only one lgr role for SMC-D; use server lock */
674 mutex_lock(&smc_server_lgr_pending);
675 rc = smc_conn_create(smc, ini);
676 if (rc) {
677 mutex_unlock(&smc_server_lgr_pending);
678 return rc;
679 }
680
681 /* Create send and receive buffers */
682 if (smc_buf_create(smc, true))
683 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
684 ini->cln_first_contact);
685
686 smc_conn_save_peer_info(smc, aclc);
687 smc_close_init(smc);
688 smc_rx_init(smc);
689 smc_tx_init(smc);
690
691 rc = smc_clc_send_confirm(smc);
692 if (rc)
693 return smc_connect_abort(smc, rc, ini->cln_first_contact);
694 mutex_unlock(&smc_server_lgr_pending);
695
696 smc_copy_sock_settings_to_clc(smc);
697 smc->connect_nonblock = 0;
698 if (smc->sk.sk_state == SMC_INIT)
699 smc->sk.sk_state = SMC_ACTIVE;
700
701 return 0;
702 }
703
704 /* perform steps before actually connecting */
705 static int __smc_connect(struct smc_sock *smc)
706 {
707 bool ism_supported = false, rdma_supported = false;
708 struct smc_clc_msg_accept_confirm aclc;
709 struct smc_init_info ini = {0};
710 int smc_type;
711 int rc = 0;
712
713 if (smc->use_fallback)
714 return smc_connect_fallback(smc, smc->fallback_rsn);
715
716 /* if peer has not signalled SMC-capability, fall back */
717 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
718 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
719
720 /* IPSec connections opt out of SMC-R optimizations */
721 if (using_ipsec(smc))
722 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
723
724 /* get vlan id from IP device */
725 if (smc_vlan_by_tcpsk(smc->clcsock, &ini))
726 return smc_connect_decline_fallback(smc,
727 SMC_CLC_DECL_GETVLANERR);
728
729 /* check if there is an ism device available */
730 if (!smc_find_ism_device(smc, &ini) &&
731 !smc_connect_ism_vlan_setup(smc, &ini)) {
732 /* ISM is supported for this connection */
733 ism_supported = true;
734 smc_type = SMC_TYPE_D;
735 }
736
737 /* check if there is a rdma device available */
738 if (!smc_find_rdma_device(smc, &ini)) {
739 /* RDMA is supported for this connection */
740 rdma_supported = true;
741 if (ism_supported)
742 smc_type = SMC_TYPE_B; /* both */
743 else
744 smc_type = SMC_TYPE_R; /* only RDMA */
745 }
746
747 /* if neither ISM nor RDMA are supported, fallback */
748 if (!rdma_supported && !ism_supported)
749 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
750
751 /* perform CLC handshake */
752 rc = smc_connect_clc(smc, smc_type, &aclc, &ini);
753 if (rc) {
754 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
755 return smc_connect_decline_fallback(smc, rc);
756 }
757
758 /* depending on previous steps, connect using rdma or ism */
759 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
760 rc = smc_connect_rdma(smc, &aclc, &ini);
761 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
762 rc = smc_connect_ism(smc, &aclc, &ini);
763 else
764 rc = SMC_CLC_DECL_MODEUNSUPP;
765 if (rc) {
766 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
767 return smc_connect_decline_fallback(smc, rc);
768 }
769
770 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
771 return 0;
772 }
773
774 static void smc_connect_work(struct work_struct *work)
775 {
776 struct smc_sock *smc = container_of(work, struct smc_sock,
777 connect_work);
778 long timeo = smc->sk.sk_sndtimeo;
779 int rc = 0;
780
781 if (!timeo)
782 timeo = MAX_SCHEDULE_TIMEOUT;
783 lock_sock(smc->clcsock->sk);
784 if (smc->clcsock->sk->sk_err) {
785 smc->sk.sk_err = smc->clcsock->sk->sk_err;
786 } else if ((1 << smc->clcsock->sk->sk_state) &
787 (TCPF_SYN_SENT | TCP_SYN_RECV)) {
788 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
789 if ((rc == -EPIPE) &&
790 ((1 << smc->clcsock->sk->sk_state) &
791 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
792 rc = 0;
793 }
794 release_sock(smc->clcsock->sk);
795 lock_sock(&smc->sk);
796 if (rc != 0 || smc->sk.sk_err) {
797 smc->sk.sk_state = SMC_CLOSED;
798 if (rc == -EPIPE || rc == -EAGAIN)
799 smc->sk.sk_err = EPIPE;
800 else if (signal_pending(current))
801 smc->sk.sk_err = -sock_intr_errno(timeo);
802 sock_put(&smc->sk); /* passive closing */
803 goto out;
804 }
805
806 rc = __smc_connect(smc);
807 if (rc < 0)
808 smc->sk.sk_err = -rc;
809
810 out:
811 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
812 if (smc->sk.sk_err) {
813 smc->sk.sk_state_change(&smc->sk);
814 } else { /* allow polling before and after fallback decision */
815 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
816 smc->sk.sk_write_space(&smc->sk);
817 }
818 }
819 release_sock(&smc->sk);
820 }
821
822 static int smc_connect(struct socket *sock, struct sockaddr *addr,
823 int alen, int flags)
824 {
825 struct sock *sk = sock->sk;
826 struct smc_sock *smc;
827 int rc = -EINVAL;
828
829 smc = smc_sk(sk);
830
831 /* separate smc parameter checking to be safe */
832 if (alen < sizeof(addr->sa_family))
833 goto out_err;
834 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
835 goto out_err;
836
837 lock_sock(sk);
838 switch (sk->sk_state) {
839 default:
840 goto out;
841 case SMC_ACTIVE:
842 rc = -EISCONN;
843 goto out;
844 case SMC_INIT:
845 rc = 0;
846 break;
847 }
848
849 smc_copy_sock_settings_to_clc(smc);
850 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
851 if (smc->connect_nonblock) {
852 rc = -EALREADY;
853 goto out;
854 }
855 rc = kernel_connect(smc->clcsock, addr, alen, flags);
856 if (rc && rc != -EINPROGRESS)
857 goto out;
858
859 sock_hold(&smc->sk); /* sock put in passive closing */
860 if (flags & O_NONBLOCK) {
861 if (schedule_work(&smc->connect_work))
862 smc->connect_nonblock = 1;
863 rc = -EINPROGRESS;
864 } else {
865 rc = __smc_connect(smc);
866 if (rc < 0)
867 goto out;
868 else
869 rc = 0; /* success cases including fallback */
870 }
871
872 out:
873 release_sock(sk);
874 out_err:
875 return rc;
876 }
877
878 static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
879 {
880 struct socket *new_clcsock = NULL;
881 struct sock *lsk = &lsmc->sk;
882 struct sock *new_sk;
883 int rc = -EINVAL;
884
885 release_sock(lsk);
886 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
887 if (!new_sk) {
888 rc = -ENOMEM;
889 lsk->sk_err = ENOMEM;
890 *new_smc = NULL;
891 lock_sock(lsk);
892 goto out;
893 }
894 *new_smc = smc_sk(new_sk);
895
896 mutex_lock(&lsmc->clcsock_release_lock);
897 if (lsmc->clcsock)
898 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
899 mutex_unlock(&lsmc->clcsock_release_lock);
900 lock_sock(lsk);
901 if (rc < 0)
902 lsk->sk_err = -rc;
903 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
904 new_sk->sk_prot->unhash(new_sk);
905 if (new_clcsock)
906 sock_release(new_clcsock);
907 new_sk->sk_state = SMC_CLOSED;
908 sock_set_flag(new_sk, SOCK_DEAD);
909 sock_put(new_sk); /* final */
910 *new_smc = NULL;
911 goto out;
912 }
913
914 (*new_smc)->clcsock = new_clcsock;
915 out:
916 return rc;
917 }
918
919 /* add a just created sock to the accept queue of the listen sock as
920 * candidate for a following socket accept call from user space
921 */
922 static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
923 {
924 struct smc_sock *par = smc_sk(parent);
925
926 sock_hold(sk); /* sock_put in smc_accept_unlink () */
927 spin_lock(&par->accept_q_lock);
928 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
929 spin_unlock(&par->accept_q_lock);
930 sk_acceptq_added(parent);
931 }
932
933 /* remove a socket from the accept queue of its parental listening socket */
934 static void smc_accept_unlink(struct sock *sk)
935 {
936 struct smc_sock *par = smc_sk(sk)->listen_smc;
937
938 spin_lock(&par->accept_q_lock);
939 list_del_init(&smc_sk(sk)->accept_q);
940 spin_unlock(&par->accept_q_lock);
941 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
942 sock_put(sk); /* sock_hold in smc_accept_enqueue */
943 }
944
945 /* remove a sock from the accept queue to bind it to a new socket created
946 * for a socket accept call from user space
947 */
948 struct sock *smc_accept_dequeue(struct sock *parent,
949 struct socket *new_sock)
950 {
951 struct smc_sock *isk, *n;
952 struct sock *new_sk;
953
954 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
955 new_sk = (struct sock *)isk;
956
957 smc_accept_unlink(new_sk);
958 if (new_sk->sk_state == SMC_CLOSED) {
959 new_sk->sk_prot->unhash(new_sk);
960 if (isk->clcsock) {
961 sock_release(isk->clcsock);
962 isk->clcsock = NULL;
963 }
964 sock_put(new_sk); /* final */
965 continue;
966 }
967 if (new_sock) {
968 sock_graft(new_sk, new_sock);
969 if (isk->use_fallback) {
970 smc_sk(new_sk)->clcsock->file = new_sock->file;
971 isk->clcsock->file->private_data = isk->clcsock;
972 }
973 }
974 return new_sk;
975 }
976 return NULL;
977 }
978
979 /* clean up for a created but never accepted sock */
980 void smc_close_non_accepted(struct sock *sk)
981 {
982 struct smc_sock *smc = smc_sk(sk);
983
984 sock_hold(sk); /* sock_put below */
985 lock_sock(sk);
986 if (!sk->sk_lingertime)
987 /* wait for peer closing */
988 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
989 __smc_release(smc);
990 release_sock(sk);
991 sock_put(sk); /* sock_hold above */
992 sock_put(sk); /* final sock_put */
993 }
994
995 static int smc_serv_conf_first_link(struct smc_sock *smc)
996 {
997 struct net *net = sock_net(smc->clcsock->sk);
998 struct smc_link_group *lgr = smc->conn.lgr;
999 struct smc_link *link;
1000 int rest;
1001 int rc;
1002
1003 link = &lgr->lnk[SMC_SINGLE_LINK];
1004
1005 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
1006 return SMC_CLC_DECL_ERR_REGRMB;
1007
1008 /* send CONFIRM LINK request to client over the RoCE fabric */
1009 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1010 if (rc < 0)
1011 return SMC_CLC_DECL_TIMEOUT_CL;
1012
1013 /* receive CONFIRM LINK response from client over the RoCE fabric */
1014 rest = wait_for_completion_interruptible_timeout(
1015 &link->llc_confirm_resp,
1016 SMC_LLC_WAIT_FIRST_TIME);
1017 if (rest <= 0) {
1018 struct smc_clc_msg_decline dclc;
1019
1020 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1021 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1022 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1023 }
1024
1025 if (link->llc_confirm_resp_rc)
1026 return SMC_CLC_DECL_RMBE_EC;
1027
1028 /* send ADD LINK request to client over the RoCE fabric */
1029 rc = smc_llc_send_add_link(link,
1030 link->smcibdev->mac[link->ibport - 1],
1031 link->gid, SMC_LLC_REQ);
1032 if (rc < 0)
1033 return SMC_CLC_DECL_TIMEOUT_AL;
1034
1035 /* receive ADD LINK response from client over the RoCE fabric */
1036 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
1037 SMC_LLC_WAIT_TIME);
1038 if (rest <= 0) {
1039 struct smc_clc_msg_decline dclc;
1040
1041 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1042 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1043 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
1044 }
1045
1046 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
1047
1048 return 0;
1049 }
1050
1051 /* listen worker: finish */
1052 static void smc_listen_out(struct smc_sock *new_smc)
1053 {
1054 struct smc_sock *lsmc = new_smc->listen_smc;
1055 struct sock *newsmcsk = &new_smc->sk;
1056
1057 if (lsmc->sk.sk_state == SMC_LISTEN) {
1058 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1059 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1060 release_sock(&lsmc->sk);
1061 } else { /* no longer listening */
1062 smc_close_non_accepted(newsmcsk);
1063 }
1064
1065 /* Wake up accept */
1066 lsmc->sk.sk_data_ready(&lsmc->sk);
1067 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1068 }
1069
1070 /* listen worker: finish in state connected */
1071 static void smc_listen_out_connected(struct smc_sock *new_smc)
1072 {
1073 struct sock *newsmcsk = &new_smc->sk;
1074
1075 sk_refcnt_debug_inc(newsmcsk);
1076 if (newsmcsk->sk_state == SMC_INIT)
1077 newsmcsk->sk_state = SMC_ACTIVE;
1078
1079 smc_listen_out(new_smc);
1080 }
1081
1082 /* listen worker: finish in error state */
1083 static void smc_listen_out_err(struct smc_sock *new_smc)
1084 {
1085 struct sock *newsmcsk = &new_smc->sk;
1086
1087 if (newsmcsk->sk_state == SMC_INIT)
1088 sock_put(&new_smc->sk); /* passive closing */
1089 newsmcsk->sk_state = SMC_CLOSED;
1090 smc_conn_free(&new_smc->conn);
1091
1092 smc_listen_out(new_smc);
1093 }
1094
1095 /* listen worker: decline and fall back if possible */
1096 static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1097 int local_contact)
1098 {
1099 /* RDMA setup failed, switch back to TCP */
1100 if (local_contact == SMC_FIRST_CONTACT)
1101 smc_lgr_forget(new_smc->conn.lgr);
1102 if (reason_code < 0) { /* error, no fallback possible */
1103 smc_listen_out_err(new_smc);
1104 return;
1105 }
1106 smc_conn_free(&new_smc->conn);
1107 smc_switch_to_fallback(new_smc);
1108 new_smc->fallback_rsn = reason_code;
1109 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1110 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1111 smc_listen_out_err(new_smc);
1112 return;
1113 }
1114 }
1115 smc_listen_out_connected(new_smc);
1116 }
1117
1118 /* listen worker: check prefixes */
1119 static int smc_listen_prfx_check(struct smc_sock *new_smc,
1120 struct smc_clc_msg_proposal *pclc)
1121 {
1122 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1123 struct socket *newclcsock = new_smc->clcsock;
1124
1125 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1126 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1127 return SMC_CLC_DECL_DIFFPREFIX;
1128
1129 return 0;
1130 }
1131
1132 /* listen worker: initialize connection and buffers */
1133 static int smc_listen_rdma_init(struct smc_sock *new_smc,
1134 struct smc_init_info *ini)
1135 {
1136 int rc;
1137
1138 /* allocate connection / link group */
1139 rc = smc_conn_create(new_smc, ini);
1140 if (rc)
1141 return rc;
1142
1143 /* create send buffer and rmb */
1144 if (smc_buf_create(new_smc, false))
1145 return SMC_CLC_DECL_MEM;
1146
1147 return 0;
1148 }
1149
1150 /* listen worker: initialize connection and buffers for SMC-D */
1151 static int smc_listen_ism_init(struct smc_sock *new_smc,
1152 struct smc_clc_msg_proposal *pclc,
1153 struct smc_init_info *ini)
1154 {
1155 struct smc_clc_msg_smcd *pclc_smcd;
1156 int rc;
1157
1158 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1159 ini->ism_gid = pclc_smcd->gid;
1160 rc = smc_conn_create(new_smc, ini);
1161 if (rc)
1162 return rc;
1163
1164 /* Check if peer can be reached via ISM device */
1165 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1166 new_smc->conn.lgr->vlan_id,
1167 new_smc->conn.lgr->smcd)) {
1168 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1169 smc_lgr_forget(new_smc->conn.lgr);
1170 smc_conn_free(&new_smc->conn);
1171 return SMC_CLC_DECL_SMCDNOTALK;
1172 }
1173
1174 /* Create send and receive buffers */
1175 if (smc_buf_create(new_smc, true)) {
1176 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1177 smc_lgr_forget(new_smc->conn.lgr);
1178 smc_conn_free(&new_smc->conn);
1179 return SMC_CLC_DECL_MEM;
1180 }
1181
1182 return 0;
1183 }
1184
1185 /* listen worker: register buffers */
1186 static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1187 {
1188 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1189
1190 if (local_contact != SMC_FIRST_CONTACT) {
1191 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1192 return SMC_CLC_DECL_ERR_REGRMB;
1193 }
1194 smc_rmb_sync_sg_for_device(&new_smc->conn);
1195
1196 return 0;
1197 }
1198
1199 /* listen worker: finish RDMA setup */
1200 static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1201 struct smc_clc_msg_accept_confirm *cclc,
1202 int local_contact)
1203 {
1204 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1205 int reason_code = 0;
1206
1207 if (local_contact == SMC_FIRST_CONTACT)
1208 smc_link_save_peer_info(link, cclc);
1209
1210 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1211 reason_code = SMC_CLC_DECL_ERR_RTOK;
1212 goto decline;
1213 }
1214
1215 if (local_contact == SMC_FIRST_CONTACT) {
1216 if (smc_ib_ready_link(link)) {
1217 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1218 goto decline;
1219 }
1220 /* QP confirmation over RoCE fabric */
1221 reason_code = smc_serv_conf_first_link(new_smc);
1222 if (reason_code)
1223 goto decline;
1224 }
1225 return 0;
1226
1227 decline:
1228 smc_listen_decline(new_smc, reason_code, local_contact);
1229 return reason_code;
1230 }
1231
1232 /* setup for RDMA connection of server */
1233 static void smc_listen_work(struct work_struct *work)
1234 {
1235 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1236 smc_listen_work);
1237 struct socket *newclcsock = new_smc->clcsock;
1238 struct smc_clc_msg_accept_confirm cclc;
1239 struct smc_clc_msg_proposal *pclc;
1240 struct smc_init_info ini = {0};
1241 bool ism_supported = false;
1242 u8 buf[SMC_CLC_MAX_LEN];
1243 int rc = 0;
1244
1245 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1246 return smc_listen_out_err(new_smc);
1247
1248 if (new_smc->use_fallback) {
1249 smc_listen_out_connected(new_smc);
1250 return;
1251 }
1252
1253 /* check if peer is smc capable */
1254 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1255 smc_switch_to_fallback(new_smc);
1256 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1257 smc_listen_out_connected(new_smc);
1258 return;
1259 }
1260
1261 /* do inband token exchange -
1262 * wait for and receive SMC Proposal CLC message
1263 */
1264 pclc = (struct smc_clc_msg_proposal *)&buf;
1265 rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1266 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1267 if (rc)
1268 goto out_decl;
1269
1270 /* IPSec connections opt out of SMC-R optimizations */
1271 if (using_ipsec(new_smc)) {
1272 rc = SMC_CLC_DECL_IPSEC;
1273 goto out_decl;
1274 }
1275
1276 /* check for matching IP prefix and subnet length */
1277 rc = smc_listen_prfx_check(new_smc, pclc);
1278 if (rc)
1279 goto out_decl;
1280
1281 /* get vlan id from IP device */
1282 if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) {
1283 rc = SMC_CLC_DECL_GETVLANERR;
1284 goto out_decl;
1285 }
1286
1287 mutex_lock(&smc_server_lgr_pending);
1288 smc_close_init(new_smc);
1289 smc_rx_init(new_smc);
1290 smc_tx_init(new_smc);
1291
1292 /* check if ISM is available */
1293 if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) {
1294 ini.is_smcd = true; /* prepare ISM check */
1295 rc = smc_find_ism_device(new_smc, &ini);
1296 if (!rc)
1297 rc = smc_listen_ism_init(new_smc, pclc, &ini);
1298 if (!rc)
1299 ism_supported = true;
1300 else if (pclc->hdr.path == SMC_TYPE_D)
1301 goto out_unlock; /* skip RDMA and decline */
1302 }
1303
1304 /* check if RDMA is available */
1305 if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */
1306 /* prepare RDMA check */
1307 ini.is_smcd = false;
1308 ini.ism_dev = NULL;
1309 ini.ib_lcl = &pclc->lcl;
1310 rc = smc_find_rdma_device(new_smc, &ini);
1311 if (rc) {
1312 /* no RDMA device found */
1313 if (pclc->hdr.path == SMC_TYPE_B)
1314 /* neither ISM nor RDMA device found */
1315 rc = SMC_CLC_DECL_NOSMCDEV;
1316 goto out_unlock;
1317 }
1318 rc = smc_listen_rdma_init(new_smc, &ini);
1319 if (rc)
1320 goto out_unlock;
1321 rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact);
1322 if (rc)
1323 goto out_unlock;
1324 }
1325
1326 /* send SMC Accept CLC message */
1327 rc = smc_clc_send_accept(new_smc, ini.cln_first_contact);
1328 if (rc)
1329 goto out_unlock;
1330
1331 /* SMC-D does not need this lock any more */
1332 if (ism_supported)
1333 mutex_unlock(&smc_server_lgr_pending);
1334
1335 /* receive SMC Confirm CLC message */
1336 rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1337 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1338 if (rc) {
1339 if (!ism_supported)
1340 goto out_unlock;
1341 goto out_decl;
1342 }
1343
1344 /* finish worker */
1345 if (!ism_supported) {
1346 rc = smc_listen_rdma_finish(new_smc, &cclc,
1347 ini.cln_first_contact);
1348 mutex_unlock(&smc_server_lgr_pending);
1349 if (rc)
1350 return;
1351 }
1352 smc_conn_save_peer_info(new_smc, &cclc);
1353 smc_listen_out_connected(new_smc);
1354 return;
1355
1356 out_unlock:
1357 mutex_unlock(&smc_server_lgr_pending);
1358 out_decl:
1359 smc_listen_decline(new_smc, rc, ini.cln_first_contact);
1360 }
1361
1362 static void smc_tcp_listen_work(struct work_struct *work)
1363 {
1364 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1365 tcp_listen_work);
1366 struct sock *lsk = &lsmc->sk;
1367 struct smc_sock *new_smc;
1368 int rc = 0;
1369
1370 lock_sock(lsk);
1371 while (lsk->sk_state == SMC_LISTEN) {
1372 rc = smc_clcsock_accept(lsmc, &new_smc);
1373 if (rc)
1374 goto out;
1375 if (!new_smc)
1376 continue;
1377
1378 new_smc->listen_smc = lsmc;
1379 new_smc->use_fallback = lsmc->use_fallback;
1380 new_smc->fallback_rsn = lsmc->fallback_rsn;
1381 sock_hold(lsk); /* sock_put in smc_listen_work */
1382 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1383 smc_copy_sock_settings_to_smc(new_smc);
1384 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1385 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1386 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1387 if (!schedule_work(&new_smc->smc_listen_work))
1388 sock_put(&new_smc->sk);
1389 }
1390
1391 out:
1392 release_sock(lsk);
1393 sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1394 }
1395
1396 static int smc_listen(struct socket *sock, int backlog)
1397 {
1398 struct sock *sk = sock->sk;
1399 struct smc_sock *smc;
1400 int rc;
1401
1402 smc = smc_sk(sk);
1403 lock_sock(sk);
1404
1405 rc = -EINVAL;
1406 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1407 smc->connect_nonblock)
1408 goto out;
1409
1410 rc = 0;
1411 if (sk->sk_state == SMC_LISTEN) {
1412 sk->sk_max_ack_backlog = backlog;
1413 goto out;
1414 }
1415 /* some socket options are handled in core, so we could not apply
1416 * them to the clc socket -- copy smc socket options to clc socket
1417 */
1418 smc_copy_sock_settings_to_clc(smc);
1419 if (!smc->use_fallback)
1420 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1421
1422 rc = kernel_listen(smc->clcsock, backlog);
1423 if (rc)
1424 goto out;
1425 sk->sk_max_ack_backlog = backlog;
1426 sk->sk_ack_backlog = 0;
1427 sk->sk_state = SMC_LISTEN;
1428 sock_hold(sk); /* sock_hold in tcp_listen_worker */
1429 if (!schedule_work(&smc->tcp_listen_work))
1430 sock_put(sk);
1431
1432 out:
1433 release_sock(sk);
1434 return rc;
1435 }
1436
1437 static int smc_accept(struct socket *sock, struct socket *new_sock,
1438 int flags, bool kern)
1439 {
1440 struct sock *sk = sock->sk, *nsk;
1441 DECLARE_WAITQUEUE(wait, current);
1442 struct smc_sock *lsmc;
1443 long timeo;
1444 int rc = 0;
1445
1446 lsmc = smc_sk(sk);
1447 sock_hold(sk); /* sock_put below */
1448 lock_sock(sk);
1449
1450 if (lsmc->sk.sk_state != SMC_LISTEN) {
1451 rc = -EINVAL;
1452 release_sock(sk);
1453 goto out;
1454 }
1455
1456 /* Wait for an incoming connection */
1457 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1458 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1459 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1460 set_current_state(TASK_INTERRUPTIBLE);
1461 if (!timeo) {
1462 rc = -EAGAIN;
1463 break;
1464 }
1465 release_sock(sk);
1466 timeo = schedule_timeout(timeo);
1467 /* wakeup by sk_data_ready in smc_listen_work() */
1468 sched_annotate_sleep();
1469 lock_sock(sk);
1470 if (signal_pending(current)) {
1471 rc = sock_intr_errno(timeo);
1472 break;
1473 }
1474 }
1475 set_current_state(TASK_RUNNING);
1476 remove_wait_queue(sk_sleep(sk), &wait);
1477
1478 if (!rc)
1479 rc = sock_error(nsk);
1480 release_sock(sk);
1481 if (rc)
1482 goto out;
1483
1484 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1485 /* wait till data arrives on the socket */
1486 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1487 MSEC_PER_SEC);
1488 if (smc_sk(nsk)->use_fallback) {
1489 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1490
1491 lock_sock(clcsk);
1492 if (skb_queue_empty(&clcsk->sk_receive_queue))
1493 sk_wait_data(clcsk, &timeo, NULL);
1494 release_sock(clcsk);
1495 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1496 lock_sock(nsk);
1497 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1498 release_sock(nsk);
1499 }
1500 }
1501
1502 out:
1503 sock_put(sk); /* sock_hold above */
1504 return rc;
1505 }
1506
1507 static int smc_getname(struct socket *sock, struct sockaddr *addr,
1508 int peer)
1509 {
1510 struct smc_sock *smc;
1511
1512 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1513 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1514 return -ENOTCONN;
1515
1516 smc = smc_sk(sock->sk);
1517
1518 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1519 }
1520
1521 static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1522 {
1523 struct sock *sk = sock->sk;
1524 struct smc_sock *smc;
1525 int rc = -EPIPE;
1526
1527 smc = smc_sk(sk);
1528 lock_sock(sk);
1529 if ((sk->sk_state != SMC_ACTIVE) &&
1530 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1531 (sk->sk_state != SMC_INIT))
1532 goto out;
1533
1534 if (msg->msg_flags & MSG_FASTOPEN) {
1535 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1536 smc_switch_to_fallback(smc);
1537 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1538 } else {
1539 rc = -EINVAL;
1540 goto out;
1541 }
1542 }
1543
1544 if (smc->use_fallback)
1545 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1546 else
1547 rc = smc_tx_sendmsg(smc, msg, len);
1548 out:
1549 release_sock(sk);
1550 return rc;
1551 }
1552
1553 static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1554 int flags)
1555 {
1556 struct sock *sk = sock->sk;
1557 struct smc_sock *smc;
1558 int rc = -ENOTCONN;
1559
1560 smc = smc_sk(sk);
1561 lock_sock(sk);
1562 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1563 /* socket was connected before, no more data to read */
1564 rc = 0;
1565 goto out;
1566 }
1567 if ((sk->sk_state == SMC_INIT) ||
1568 (sk->sk_state == SMC_LISTEN) ||
1569 (sk->sk_state == SMC_CLOSED))
1570 goto out;
1571
1572 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1573 rc = 0;
1574 goto out;
1575 }
1576
1577 if (smc->use_fallback) {
1578 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1579 } else {
1580 msg->msg_namelen = 0;
1581 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1582 }
1583
1584 out:
1585 release_sock(sk);
1586 return rc;
1587 }
1588
1589 static __poll_t smc_accept_poll(struct sock *parent)
1590 {
1591 struct smc_sock *isk = smc_sk(parent);
1592 __poll_t mask = 0;
1593
1594 spin_lock(&isk->accept_q_lock);
1595 if (!list_empty(&isk->accept_q))
1596 mask = EPOLLIN | EPOLLRDNORM;
1597 spin_unlock(&isk->accept_q_lock);
1598
1599 return mask;
1600 }
1601
1602 static __poll_t smc_poll(struct file *file, struct socket *sock,
1603 poll_table *wait)
1604 {
1605 struct sock *sk = sock->sk;
1606 struct smc_sock *smc;
1607 __poll_t mask = 0;
1608
1609 if (!sk)
1610 return EPOLLNVAL;
1611
1612 smc = smc_sk(sock->sk);
1613 if (smc->use_fallback) {
1614 /* delegate to CLC child sock */
1615 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1616 sk->sk_err = smc->clcsock->sk->sk_err;
1617 } else {
1618 if (sk->sk_state != SMC_CLOSED)
1619 sock_poll_wait(file, sock, wait);
1620 if (sk->sk_err)
1621 mask |= EPOLLERR;
1622 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1623 (sk->sk_state == SMC_CLOSED))
1624 mask |= EPOLLHUP;
1625 if (sk->sk_state == SMC_LISTEN) {
1626 /* woken up by sk_data_ready in smc_listen_work() */
1627 mask |= smc_accept_poll(sk);
1628 } else if (smc->use_fallback) { /* as result of connect_work()*/
1629 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
1630 wait);
1631 sk->sk_err = smc->clcsock->sk->sk_err;
1632 } else {
1633 if ((sk->sk_state != SMC_INIT &&
1634 atomic_read(&smc->conn.sndbuf_space)) ||
1635 sk->sk_shutdown & SEND_SHUTDOWN) {
1636 mask |= EPOLLOUT | EPOLLWRNORM;
1637 } else {
1638 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1639 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1640 }
1641 if (atomic_read(&smc->conn.bytes_to_rcv))
1642 mask |= EPOLLIN | EPOLLRDNORM;
1643 if (sk->sk_shutdown & RCV_SHUTDOWN)
1644 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1645 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1646 mask |= EPOLLIN;
1647 if (smc->conn.urg_state == SMC_URG_VALID)
1648 mask |= EPOLLPRI;
1649 }
1650 }
1651
1652 return mask;
1653 }
1654
1655 static int smc_shutdown(struct socket *sock, int how)
1656 {
1657 struct sock *sk = sock->sk;
1658 struct smc_sock *smc;
1659 int rc = -EINVAL;
1660 int rc1 = 0;
1661
1662 smc = smc_sk(sk);
1663
1664 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1665 return rc;
1666
1667 lock_sock(sk);
1668
1669 rc = -ENOTCONN;
1670 if ((sk->sk_state != SMC_ACTIVE) &&
1671 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1672 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1673 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1674 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1675 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1676 goto out;
1677 if (smc->use_fallback) {
1678 rc = kernel_sock_shutdown(smc->clcsock, how);
1679 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1680 if (sk->sk_shutdown == SHUTDOWN_MASK)
1681 sk->sk_state = SMC_CLOSED;
1682 goto out;
1683 }
1684 switch (how) {
1685 case SHUT_RDWR: /* shutdown in both directions */
1686 rc = smc_close_active(smc);
1687 break;
1688 case SHUT_WR:
1689 rc = smc_close_shutdown_write(smc);
1690 break;
1691 case SHUT_RD:
1692 rc = 0;
1693 /* nothing more to do because peer is not involved */
1694 break;
1695 }
1696 if (smc->clcsock)
1697 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1698 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1699 sk->sk_shutdown |= how + 1;
1700
1701 out:
1702 release_sock(sk);
1703 return rc ? rc : rc1;
1704 }
1705
1706 static int smc_setsockopt(struct socket *sock, int level, int optname,
1707 char __user *optval, unsigned int optlen)
1708 {
1709 struct sock *sk = sock->sk;
1710 struct smc_sock *smc;
1711 int val, rc;
1712
1713 smc = smc_sk(sk);
1714
1715 /* generic setsockopts reaching us here always apply to the
1716 * CLC socket
1717 */
1718 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1719 optval, optlen);
1720 if (smc->clcsock->sk->sk_err) {
1721 sk->sk_err = smc->clcsock->sk->sk_err;
1722 sk->sk_error_report(sk);
1723 }
1724 if (rc)
1725 return rc;
1726
1727 if (optlen < sizeof(int))
1728 return -EINVAL;
1729 if (get_user(val, (int __user *)optval))
1730 return -EFAULT;
1731
1732 lock_sock(sk);
1733 switch (optname) {
1734 case TCP_ULP:
1735 case TCP_FASTOPEN:
1736 case TCP_FASTOPEN_CONNECT:
1737 case TCP_FASTOPEN_KEY:
1738 case TCP_FASTOPEN_NO_COOKIE:
1739 /* option not supported by SMC */
1740 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1741 smc_switch_to_fallback(smc);
1742 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1743 } else {
1744 if (!smc->use_fallback)
1745 rc = -EINVAL;
1746 }
1747 break;
1748 case TCP_NODELAY:
1749 if (sk->sk_state != SMC_INIT &&
1750 sk->sk_state != SMC_LISTEN &&
1751 sk->sk_state != SMC_CLOSED) {
1752 if (val && !smc->use_fallback)
1753 mod_delayed_work(system_wq, &smc->conn.tx_work,
1754 0);
1755 }
1756 break;
1757 case TCP_CORK:
1758 if (sk->sk_state != SMC_INIT &&
1759 sk->sk_state != SMC_LISTEN &&
1760 sk->sk_state != SMC_CLOSED) {
1761 if (!val && !smc->use_fallback)
1762 mod_delayed_work(system_wq, &smc->conn.tx_work,
1763 0);
1764 }
1765 break;
1766 case TCP_DEFER_ACCEPT:
1767 smc->sockopt_defer_accept = val;
1768 break;
1769 default:
1770 break;
1771 }
1772 release_sock(sk);
1773
1774 return rc;
1775 }
1776
1777 static int smc_getsockopt(struct socket *sock, int level, int optname,
1778 char __user *optval, int __user *optlen)
1779 {
1780 struct smc_sock *smc;
1781
1782 smc = smc_sk(sock->sk);
1783 /* socket options apply to the CLC socket */
1784 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1785 optval, optlen);
1786 }
1787
1788 static int smc_ioctl(struct socket *sock, unsigned int cmd,
1789 unsigned long arg)
1790 {
1791 union smc_host_cursor cons, urg;
1792 struct smc_connection *conn;
1793 struct smc_sock *smc;
1794 int answ;
1795
1796 smc = smc_sk(sock->sk);
1797 conn = &smc->conn;
1798 lock_sock(&smc->sk);
1799 if (smc->use_fallback) {
1800 if (!smc->clcsock) {
1801 release_sock(&smc->sk);
1802 return -EBADF;
1803 }
1804 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1805 release_sock(&smc->sk);
1806 return answ;
1807 }
1808 switch (cmd) {
1809 case SIOCINQ: /* same as FIONREAD */
1810 if (smc->sk.sk_state == SMC_LISTEN) {
1811 release_sock(&smc->sk);
1812 return -EINVAL;
1813 }
1814 if (smc->sk.sk_state == SMC_INIT ||
1815 smc->sk.sk_state == SMC_CLOSED)
1816 answ = 0;
1817 else
1818 answ = atomic_read(&smc->conn.bytes_to_rcv);
1819 break;
1820 case SIOCOUTQ:
1821 /* output queue size (not send + not acked) */
1822 if (smc->sk.sk_state == SMC_LISTEN) {
1823 release_sock(&smc->sk);
1824 return -EINVAL;
1825 }
1826 if (smc->sk.sk_state == SMC_INIT ||
1827 smc->sk.sk_state == SMC_CLOSED)
1828 answ = 0;
1829 else
1830 answ = smc->conn.sndbuf_desc->len -
1831 atomic_read(&smc->conn.sndbuf_space);
1832 break;
1833 case SIOCOUTQNSD:
1834 /* output queue size (not send only) */
1835 if (smc->sk.sk_state == SMC_LISTEN) {
1836 release_sock(&smc->sk);
1837 return -EINVAL;
1838 }
1839 if (smc->sk.sk_state == SMC_INIT ||
1840 smc->sk.sk_state == SMC_CLOSED)
1841 answ = 0;
1842 else
1843 answ = smc_tx_prepared_sends(&smc->conn);
1844 break;
1845 case SIOCATMARK:
1846 if (smc->sk.sk_state == SMC_LISTEN) {
1847 release_sock(&smc->sk);
1848 return -EINVAL;
1849 }
1850 if (smc->sk.sk_state == SMC_INIT ||
1851 smc->sk.sk_state == SMC_CLOSED) {
1852 answ = 0;
1853 } else {
1854 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1855 smc_curs_copy(&urg, &conn->urg_curs, conn);
1856 answ = smc_curs_diff(conn->rmb_desc->len,
1857 &cons, &urg) == 1;
1858 }
1859 break;
1860 default:
1861 release_sock(&smc->sk);
1862 return -ENOIOCTLCMD;
1863 }
1864 release_sock(&smc->sk);
1865
1866 return put_user(answ, (int __user *)arg);
1867 }
1868
1869 static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1870 int offset, size_t size, int flags)
1871 {
1872 struct sock *sk = sock->sk;
1873 struct smc_sock *smc;
1874 int rc = -EPIPE;
1875
1876 smc = smc_sk(sk);
1877 lock_sock(sk);
1878 if (sk->sk_state != SMC_ACTIVE) {
1879 release_sock(sk);
1880 goto out;
1881 }
1882 release_sock(sk);
1883 if (smc->use_fallback)
1884 rc = kernel_sendpage(smc->clcsock, page, offset,
1885 size, flags);
1886 else
1887 rc = sock_no_sendpage(sock, page, offset, size, flags);
1888
1889 out:
1890 return rc;
1891 }
1892
1893 /* Map the affected portions of the rmbe into an spd, note the number of bytes
1894 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1895 * updates till whenever a respective page has been fully processed.
1896 * Note that subsequent recv() calls have to wait till all splice() processing
1897 * completed.
1898 */
1899 static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1900 struct pipe_inode_info *pipe, size_t len,
1901 unsigned int flags)
1902 {
1903 struct sock *sk = sock->sk;
1904 struct smc_sock *smc;
1905 int rc = -ENOTCONN;
1906
1907 smc = smc_sk(sk);
1908 lock_sock(sk);
1909 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1910 /* socket was connected before, no more data to read */
1911 rc = 0;
1912 goto out;
1913 }
1914 if (sk->sk_state == SMC_INIT ||
1915 sk->sk_state == SMC_LISTEN ||
1916 sk->sk_state == SMC_CLOSED)
1917 goto out;
1918
1919 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1920 rc = 0;
1921 goto out;
1922 }
1923
1924 if (smc->use_fallback) {
1925 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1926 pipe, len, flags);
1927 } else {
1928 if (*ppos) {
1929 rc = -ESPIPE;
1930 goto out;
1931 }
1932 if (flags & SPLICE_F_NONBLOCK)
1933 flags = MSG_DONTWAIT;
1934 else
1935 flags = 0;
1936 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1937 }
1938 out:
1939 release_sock(sk);
1940
1941 return rc;
1942 }
1943
1944 /* must look like tcp */
1945 static const struct proto_ops smc_sock_ops = {
1946 .family = PF_SMC,
1947 .owner = THIS_MODULE,
1948 .release = smc_release,
1949 .bind = smc_bind,
1950 .connect = smc_connect,
1951 .socketpair = sock_no_socketpair,
1952 .accept = smc_accept,
1953 .getname = smc_getname,
1954 .poll = smc_poll,
1955 .ioctl = smc_ioctl,
1956 .listen = smc_listen,
1957 .shutdown = smc_shutdown,
1958 .setsockopt = smc_setsockopt,
1959 .getsockopt = smc_getsockopt,
1960 .sendmsg = smc_sendmsg,
1961 .recvmsg = smc_recvmsg,
1962 .mmap = sock_no_mmap,
1963 .sendpage = smc_sendpage,
1964 .splice_read = smc_splice_read,
1965 };
1966
1967 static int smc_create(struct net *net, struct socket *sock, int protocol,
1968 int kern)
1969 {
1970 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1971 struct smc_sock *smc;
1972 struct sock *sk;
1973 int rc;
1974
1975 rc = -ESOCKTNOSUPPORT;
1976 if (sock->type != SOCK_STREAM)
1977 goto out;
1978
1979 rc = -EPROTONOSUPPORT;
1980 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1981 goto out;
1982
1983 rc = -ENOBUFS;
1984 sock->ops = &smc_sock_ops;
1985 sk = smc_sock_alloc(net, sock, protocol);
1986 if (!sk)
1987 goto out;
1988
1989 /* create internal TCP socket for CLC handshake and fallback */
1990 smc = smc_sk(sk);
1991 smc->use_fallback = false; /* assume rdma capability first */
1992 smc->fallback_rsn = 0;
1993 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1994 &smc->clcsock);
1995 if (rc) {
1996 sk_common_release(sk);
1997 goto out;
1998 }
1999 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2000 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
2001
2002 out:
2003 return rc;
2004 }
2005
2006 static const struct net_proto_family smc_sock_family_ops = {
2007 .family = PF_SMC,
2008 .owner = THIS_MODULE,
2009 .create = smc_create,
2010 };
2011
2012 unsigned int smc_net_id;
2013
2014 static __net_init int smc_net_init(struct net *net)
2015 {
2016 return smc_pnet_net_init(net);
2017 }
2018
2019 static void __net_exit smc_net_exit(struct net *net)
2020 {
2021 smc_pnet_net_exit(net);
2022 }
2023
2024 static struct pernet_operations smc_net_ops = {
2025 .init = smc_net_init,
2026 .exit = smc_net_exit,
2027 .id = &smc_net_id,
2028 .size = sizeof(struct smc_net),
2029 };
2030
2031 static int __init smc_init(void)
2032 {
2033 int rc;
2034
2035 rc = register_pernet_subsys(&smc_net_ops);
2036 if (rc)
2037 return rc;
2038
2039 rc = smc_pnet_init();
2040 if (rc)
2041 goto out_pernet_subsys;
2042
2043 rc = smc_core_init();
2044 if (rc) {
2045 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
2046 goto out_pnet;
2047 }
2048
2049 rc = smc_llc_init();
2050 if (rc) {
2051 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2052 goto out_core;
2053 }
2054
2055 rc = smc_cdc_init();
2056 if (rc) {
2057 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2058 goto out_core;
2059 }
2060
2061 rc = proto_register(&smc_proto, 1);
2062 if (rc) {
2063 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2064 goto out_core;
2065 }
2066
2067 rc = proto_register(&smc_proto6, 1);
2068 if (rc) {
2069 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2070 goto out_proto;
2071 }
2072
2073 rc = sock_register(&smc_sock_family_ops);
2074 if (rc) {
2075 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2076 goto out_proto6;
2077 }
2078 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2079 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2080
2081 rc = smc_ib_register_client();
2082 if (rc) {
2083 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2084 goto out_sock;
2085 }
2086
2087 static_branch_enable(&tcp_have_smc);
2088 return 0;
2089
2090 out_sock:
2091 sock_unregister(PF_SMC);
2092 out_proto6:
2093 proto_unregister(&smc_proto6);
2094 out_proto:
2095 proto_unregister(&smc_proto);
2096 out_core:
2097 smc_core_exit();
2098 out_pnet:
2099 smc_pnet_exit();
2100 out_pernet_subsys:
2101 unregister_pernet_subsys(&smc_net_ops);
2102
2103 return rc;
2104 }
2105
2106 static void __exit smc_exit(void)
2107 {
2108 static_branch_disable(&tcp_have_smc);
2109 sock_unregister(PF_SMC);
2110 smc_core_exit();
2111 smc_ib_unregister_client();
2112 proto_unregister(&smc_proto6);
2113 proto_unregister(&smc_proto);
2114 smc_pnet_exit();
2115 unregister_pernet_subsys(&smc_net_ops);
2116 rcu_barrier();
2117 }
2118
2119 module_init(smc_init);
2120 module_exit(smc_exit);
2121
2122 MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2123 MODULE_DESCRIPTION("smc socket address family");
2124 MODULE_LICENSE("GPL");
2125 MODULE_ALIAS_NETPROTO(PF_SMC);
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