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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
29#include <net/sock.h>
30#include <net/tcp.h>
31#include <net/smc.h>
32#include <asm/ioctls.h>
33
34#include <net/net_namespace.h>
35#include <net/netns/generic.h>
36#include "smc_netns.h"
37
38#include "smc.h"
39#include "smc_clc.h"
40#include "smc_llc.h"
41#include "smc_cdc.h"
42#include "smc_core.h"
43#include "smc_ib.h"
44#include "smc_ism.h"
45#include "smc_pnet.h"
46#include "smc_tx.h"
47#include "smc_rx.h"
48#include "smc_close.h"
49
50static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
51 * creation on server
52 */
53static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
54 * creation on client
55 */
56
57static void smc_tcp_listen_work(struct work_struct *);
58static void smc_connect_work(struct work_struct *);
59
60static void smc_set_keepalive(struct sock *sk, int val)
61{
62 struct smc_sock *smc = smc_sk(sk);
63
64 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
65}
66
67static struct smc_hashinfo smc_v4_hashinfo = {
68 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
69};
70
71static struct smc_hashinfo smc_v6_hashinfo = {
72 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
73};
74
75int smc_hash_sk(struct sock *sk)
76{
77 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
78 struct hlist_head *head;
79
80 head = &h->ht;
81
82 write_lock_bh(&h->lock);
83 sk_add_node(sk, head);
84 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
85 write_unlock_bh(&h->lock);
86
87 return 0;
88}
89EXPORT_SYMBOL_GPL(smc_hash_sk);
90
91void smc_unhash_sk(struct sock *sk)
92{
93 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
94
95 write_lock_bh(&h->lock);
96 if (sk_del_node_init(sk))
97 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
98 write_unlock_bh(&h->lock);
99}
100EXPORT_SYMBOL_GPL(smc_unhash_sk);
101
102struct proto smc_proto = {
103 .name = "SMC",
104 .owner = THIS_MODULE,
105 .keepalive = smc_set_keepalive,
106 .hash = smc_hash_sk,
107 .unhash = smc_unhash_sk,
108 .obj_size = sizeof(struct smc_sock),
109 .h.smc_hash = &smc_v4_hashinfo,
110 .slab_flags = SLAB_TYPESAFE_BY_RCU,
111};
112EXPORT_SYMBOL_GPL(smc_proto);
113
114struct proto smc_proto6 = {
115 .name = "SMC6",
116 .owner = THIS_MODULE,
117 .keepalive = smc_set_keepalive,
118 .hash = smc_hash_sk,
119 .unhash = smc_unhash_sk,
120 .obj_size = sizeof(struct smc_sock),
121 .h.smc_hash = &smc_v6_hashinfo,
122 .slab_flags = SLAB_TYPESAFE_BY_RCU,
123};
124EXPORT_SYMBOL_GPL(smc_proto6);
125
126static void smc_restore_fallback_changes(struct smc_sock *smc)
127{
128 smc->clcsock->file->private_data = smc->sk.sk_socket;
129 smc->clcsock->file = NULL;
130}
131
132static int __smc_release(struct smc_sock *smc)
133{
134 struct sock *sk = &smc->sk;
135 int rc = 0;
136
137 if (!smc->use_fallback) {
138 rc = smc_close_active(smc);
139 sock_set_flag(sk, SOCK_DEAD);
140 sk->sk_shutdown |= SHUTDOWN_MASK;
141 } else {
142 if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT)
143 sock_put(sk); /* passive closing */
144 if (sk->sk_state == SMC_LISTEN) {
145 /* wake up clcsock accept */
146 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
147 }
148 sk->sk_state = SMC_CLOSED;
149 sk->sk_state_change(sk);
150 smc_restore_fallback_changes(smc);
151 }
152
153 sk->sk_prot->unhash(sk);
154
155 if (sk->sk_state == SMC_CLOSED) {
156 if (smc->clcsock) {
157 release_sock(sk);
158 smc_clcsock_release(smc);
159 lock_sock(sk);
160 }
161 if (!smc->use_fallback)
162 smc_conn_free(&smc->conn);
163 }
164
165 return rc;
166}
167
168static int smc_release(struct socket *sock)
169{
170 struct sock *sk = sock->sk;
171 struct smc_sock *smc;
172 int rc = 0;
173
174 if (!sk)
175 goto out;
176
177 smc = smc_sk(sk);
178
179 /* cleanup for a dangling non-blocking connect */
180 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
181 tcp_abort(smc->clcsock->sk, ECONNABORTED);
182 flush_work(&smc->connect_work);
183
184 if (sk->sk_state == SMC_LISTEN)
185 /* smc_close_non_accepted() is called and acquires
186 * sock lock for child sockets again
187 */
188 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
189 else
190 lock_sock(sk);
191
192 rc = __smc_release(smc);
193
194 /* detach socket */
195 sock_orphan(sk);
196 sock->sk = NULL;
197 release_sock(sk);
198
199 sock_put(sk); /* final sock_put */
200out:
201 return rc;
202}
203
204static void smc_destruct(struct sock *sk)
205{
206 if (sk->sk_state != SMC_CLOSED)
207 return;
208 if (!sock_flag(sk, SOCK_DEAD))
209 return;
210
211 sk_refcnt_debug_dec(sk);
212}
213
214static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
215 int protocol)
216{
217 struct smc_sock *smc;
218 struct proto *prot;
219 struct sock *sk;
220
221 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
222 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
223 if (!sk)
224 return NULL;
225
226 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
227 sk->sk_state = SMC_INIT;
228 sk->sk_destruct = smc_destruct;
229 sk->sk_protocol = protocol;
230 smc = smc_sk(sk);
231 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
232 INIT_WORK(&smc->connect_work, smc_connect_work);
233 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
234 INIT_LIST_HEAD(&smc->accept_q);
235 spin_lock_init(&smc->accept_q_lock);
236 spin_lock_init(&smc->conn.send_lock);
237 sk->sk_prot->hash(sk);
238 sk_refcnt_debug_inc(sk);
239 mutex_init(&smc->clcsock_release_lock);
240
241 return sk;
242}
243
244static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
245 int addr_len)
246{
247 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
248 struct sock *sk = sock->sk;
249 struct smc_sock *smc;
250 int rc;
251
252 smc = smc_sk(sk);
253
254 /* replicate tests from inet_bind(), to be safe wrt. future changes */
255 rc = -EINVAL;
256 if (addr_len < sizeof(struct sockaddr_in))
257 goto out;
258
259 rc = -EAFNOSUPPORT;
260 if (addr->sin_family != AF_INET &&
261 addr->sin_family != AF_INET6 &&
262 addr->sin_family != AF_UNSPEC)
263 goto out;
264 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
265 if (addr->sin_family == AF_UNSPEC &&
266 addr->sin_addr.s_addr != htonl(INADDR_ANY))
267 goto out;
268
269 lock_sock(sk);
270
271 /* Check if socket is already active */
272 rc = -EINVAL;
273 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
274 goto out_rel;
275
276 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
277 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
278
279out_rel:
280 release_sock(sk);
281out:
282 return rc;
283}
284
285static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
286 unsigned long mask)
287{
288 /* options we don't get control via setsockopt for */
289 nsk->sk_type = osk->sk_type;
290 nsk->sk_sndbuf = osk->sk_sndbuf;
291 nsk->sk_rcvbuf = osk->sk_rcvbuf;
292 nsk->sk_sndtimeo = osk->sk_sndtimeo;
293 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
294 nsk->sk_mark = osk->sk_mark;
295 nsk->sk_priority = osk->sk_priority;
296 nsk->sk_rcvlowat = osk->sk_rcvlowat;
297 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
298 nsk->sk_err = osk->sk_err;
299
300 nsk->sk_flags &= ~mask;
301 nsk->sk_flags |= osk->sk_flags & mask;
302}
303
304#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
305 (1UL << SOCK_KEEPOPEN) | \
306 (1UL << SOCK_LINGER) | \
307 (1UL << SOCK_BROADCAST) | \
308 (1UL << SOCK_TIMESTAMP) | \
309 (1UL << SOCK_DBG) | \
310 (1UL << SOCK_RCVTSTAMP) | \
311 (1UL << SOCK_RCVTSTAMPNS) | \
312 (1UL << SOCK_LOCALROUTE) | \
313 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
314 (1UL << SOCK_RXQ_OVFL) | \
315 (1UL << SOCK_WIFI_STATUS) | \
316 (1UL << SOCK_NOFCS) | \
317 (1UL << SOCK_FILTER_LOCKED) | \
318 (1UL << SOCK_TSTAMP_NEW))
319/* copy only relevant settings and flags of SOL_SOCKET level from smc to
320 * clc socket (since smc is not called for these options from net/core)
321 */
322static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
323{
324 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
325}
326
327#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
328 (1UL << SOCK_KEEPOPEN) | \
329 (1UL << SOCK_LINGER) | \
330 (1UL << SOCK_DBG))
331/* copy only settings and flags relevant for smc from clc to smc socket */
332static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
333{
334 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
335}
336
337/* register a new rmb, send confirm_rkey msg to register with peer */
338static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc,
339 bool conf_rkey)
340{
341 if (!rmb_desc->wr_reg) {
342 /* register memory region for new rmb */
343 if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
344 rmb_desc->regerr = 1;
345 return -EFAULT;
346 }
347 rmb_desc->wr_reg = 1;
348 }
349 if (!conf_rkey)
350 return 0;
351 /* exchange confirm_rkey msg with peer */
352 if (smc_llc_do_confirm_rkey(link, rmb_desc)) {
353 rmb_desc->regerr = 1;
354 return -EFAULT;
355 }
356 return 0;
357}
358
359static int smc_clnt_conf_first_link(struct smc_sock *smc)
360{
361 struct net *net = sock_net(smc->clcsock->sk);
362 struct smc_link_group *lgr = smc->conn.lgr;
363 struct smc_link *link;
364 int rest;
365 int rc;
366
367 link = &lgr->lnk[SMC_SINGLE_LINK];
368 /* receive CONFIRM LINK request from server over RoCE fabric */
369 rest = wait_for_completion_interruptible_timeout(
370 &link->llc_confirm,
371 SMC_LLC_WAIT_FIRST_TIME);
372 if (rest <= 0) {
373 struct smc_clc_msg_decline dclc;
374
375 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
376 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
377 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
378 }
379
380 if (link->llc_confirm_rc)
381 return SMC_CLC_DECL_RMBE_EC;
382
383 rc = smc_ib_modify_qp_rts(link);
384 if (rc)
385 return SMC_CLC_DECL_ERR_RDYLNK;
386
387 smc_wr_remember_qp_attr(link);
388
389 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
390 return SMC_CLC_DECL_ERR_REGRMB;
391
392 /* send CONFIRM LINK response over RoCE fabric */
393 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
394 if (rc < 0)
395 return SMC_CLC_DECL_TIMEOUT_CL;
396
397 /* receive ADD LINK request from server over RoCE fabric */
398 rest = wait_for_completion_interruptible_timeout(&link->llc_add,
399 SMC_LLC_WAIT_TIME);
400 if (rest <= 0) {
401 struct smc_clc_msg_decline dclc;
402
403 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
404 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
405 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
406 }
407
408 /* send add link reject message, only one link supported for now */
409 rc = smc_llc_send_add_link(link,
410 link->smcibdev->mac[link->ibport - 1],
411 link->gid, SMC_LLC_RESP);
412 if (rc < 0)
413 return SMC_CLC_DECL_TIMEOUT_AL;
414
415 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
416
417 return 0;
418}
419
420static void smcr_conn_save_peer_info(struct smc_sock *smc,
421 struct smc_clc_msg_accept_confirm *clc)
422{
423 int bufsize = smc_uncompress_bufsize(clc->rmbe_size);
424
425 smc->conn.peer_rmbe_idx = clc->rmbe_idx;
426 smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token);
427 smc->conn.peer_rmbe_size = bufsize;
428 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
429 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
430}
431
432static void smcd_conn_save_peer_info(struct smc_sock *smc,
433 struct smc_clc_msg_accept_confirm *clc)
434{
435 int bufsize = smc_uncompress_bufsize(clc->dmbe_size);
436
437 smc->conn.peer_rmbe_idx = clc->dmbe_idx;
438 smc->conn.peer_token = clc->token;
439 /* msg header takes up space in the buffer */
440 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
441 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
442 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
443}
444
445static void smc_conn_save_peer_info(struct smc_sock *smc,
446 struct smc_clc_msg_accept_confirm *clc)
447{
448 if (smc->conn.lgr->is_smcd)
449 smcd_conn_save_peer_info(smc, clc);
450 else
451 smcr_conn_save_peer_info(smc, clc);
452}
453
454static void smc_link_save_peer_info(struct smc_link *link,
455 struct smc_clc_msg_accept_confirm *clc)
456{
457 link->peer_qpn = ntoh24(clc->qpn);
458 memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE);
459 memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac));
460 link->peer_psn = ntoh24(clc->psn);
461 link->peer_mtu = clc->qp_mtu;
462}
463
464static void smc_switch_to_fallback(struct smc_sock *smc)
465{
466 smc->use_fallback = true;
467 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
468 smc->clcsock->file = smc->sk.sk_socket->file;
469 smc->clcsock->file->private_data = smc->clcsock;
470 }
471}
472
473/* fall back during connect */
474static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
475{
476 smc_switch_to_fallback(smc);
477 smc->fallback_rsn = reason_code;
478 smc_copy_sock_settings_to_clc(smc);
479 smc->connect_nonblock = 0;
480 if (smc->sk.sk_state == SMC_INIT)
481 smc->sk.sk_state = SMC_ACTIVE;
482 return 0;
483}
484
485/* decline and fall back during connect */
486static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code)
487{
488 int rc;
489
490 if (reason_code < 0) { /* error, fallback is not possible */
491 if (smc->sk.sk_state == SMC_INIT)
492 sock_put(&smc->sk); /* passive closing */
493 return reason_code;
494 }
495 if (reason_code != SMC_CLC_DECL_PEERDECL) {
496 rc = smc_clc_send_decline(smc, reason_code);
497 if (rc < 0) {
498 if (smc->sk.sk_state == SMC_INIT)
499 sock_put(&smc->sk); /* passive closing */
500 return rc;
501 }
502 }
503 return smc_connect_fallback(smc, reason_code);
504}
505
506/* abort connecting */
507static int smc_connect_abort(struct smc_sock *smc, int reason_code,
508 int local_contact)
509{
510 if (local_contact == SMC_FIRST_CONTACT)
511 smc_lgr_forget(smc->conn.lgr);
512 if (smc->conn.lgr->is_smcd)
513 /* there is only one lgr role for SMC-D; use server lock */
514 mutex_unlock(&smc_server_lgr_pending);
515 else
516 mutex_unlock(&smc_client_lgr_pending);
517
518 smc_conn_free(&smc->conn);
519 smc->connect_nonblock = 0;
520 return reason_code;
521}
522
523/* check if there is a rdma device available for this connection. */
524/* called for connect and listen */
525static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
526{
527 /* PNET table look up: search active ib_device and port
528 * within same PNETID that also contains the ethernet device
529 * used for the internal TCP socket
530 */
531 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
532 if (!ini->ib_dev)
533 return SMC_CLC_DECL_NOSMCRDEV;
534 return 0;
535}
536
537/* check if there is an ISM device available for this connection. */
538/* called for connect and listen */
539static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
540{
541 /* Find ISM device with same PNETID as connecting interface */
542 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
543 if (!ini->ism_dev)
544 return SMC_CLC_DECL_NOSMCDDEV;
545 return 0;
546}
547
548/* Check for VLAN ID and register it on ISM device just for CLC handshake */
549static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
550 struct smc_init_info *ini)
551{
552 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id))
553 return SMC_CLC_DECL_ISMVLANERR;
554 return 0;
555}
556
557/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
558 * used, the VLAN ID will be registered again during the connection setup.
559 */
560static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd,
561 struct smc_init_info *ini)
562{
563 if (!is_smcd)
564 return 0;
565 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id))
566 return SMC_CLC_DECL_CNFERR;
567 return 0;
568}
569
570/* CLC handshake during connect */
571static int smc_connect_clc(struct smc_sock *smc, int smc_type,
572 struct smc_clc_msg_accept_confirm *aclc,
573 struct smc_init_info *ini)
574{
575 int rc = 0;
576
577 /* do inband token exchange */
578 rc = smc_clc_send_proposal(smc, smc_type, ini);
579 if (rc)
580 return rc;
581 /* receive SMC Accept CLC message */
582 return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT,
583 CLC_WAIT_TIME);
584}
585
586/* setup for RDMA connection of client */
587static int smc_connect_rdma(struct smc_sock *smc,
588 struct smc_clc_msg_accept_confirm *aclc,
589 struct smc_init_info *ini)
590{
591 struct smc_link *link;
592 int reason_code = 0;
593
594 ini->is_smcd = false;
595 ini->ib_lcl = &aclc->lcl;
596 ini->ib_clcqpn = ntoh24(aclc->qpn);
597 ini->srv_first_contact = aclc->hdr.flag;
598
599 mutex_lock(&smc_client_lgr_pending);
600 reason_code = smc_conn_create(smc, ini);
601 if (reason_code) {
602 mutex_unlock(&smc_client_lgr_pending);
603 return reason_code;
604 }
605 link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK];
606
607 smc_conn_save_peer_info(smc, aclc);
608
609 /* create send buffer and rmb */
610 if (smc_buf_create(smc, false))
611 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
612 ini->cln_first_contact);
613
614 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
615 smc_link_save_peer_info(link, aclc);
616
617 if (smc_rmb_rtoken_handling(&smc->conn, aclc))
618 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK,
619 ini->cln_first_contact);
620
621 smc_close_init(smc);
622 smc_rx_init(smc);
623
624 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
625 if (smc_ib_ready_link(link))
626 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK,
627 ini->cln_first_contact);
628 } else {
629 if (smc_reg_rmb(link, smc->conn.rmb_desc, true))
630 return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB,
631 ini->cln_first_contact);
632 }
633 smc_rmb_sync_sg_for_device(&smc->conn);
634
635 reason_code = smc_clc_send_confirm(smc);
636 if (reason_code)
637 return smc_connect_abort(smc, reason_code,
638 ini->cln_first_contact);
639
640 smc_tx_init(smc);
641
642 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
643 /* QP confirmation over RoCE fabric */
644 reason_code = smc_clnt_conf_first_link(smc);
645 if (reason_code)
646 return smc_connect_abort(smc, reason_code,
647 ini->cln_first_contact);
648 }
649 mutex_unlock(&smc_client_lgr_pending);
650
651 smc_copy_sock_settings_to_clc(smc);
652 smc->connect_nonblock = 0;
653 if (smc->sk.sk_state == SMC_INIT)
654 smc->sk.sk_state = SMC_ACTIVE;
655
656 return 0;
657}
658
659/* setup for ISM connection of client */
660static int smc_connect_ism(struct smc_sock *smc,
661 struct smc_clc_msg_accept_confirm *aclc,
662 struct smc_init_info *ini)
663{
664 int rc = 0;
665
666 ini->is_smcd = true;
667 ini->ism_gid = aclc->gid;
668 ini->srv_first_contact = aclc->hdr.flag;
669
670 /* there is only one lgr role for SMC-D; use server lock */
671 mutex_lock(&smc_server_lgr_pending);
672 rc = smc_conn_create(smc, ini);
673 if (rc) {
674 mutex_unlock(&smc_server_lgr_pending);
675 return rc;
676 }
677
678 /* Create send and receive buffers */
679 if (smc_buf_create(smc, true))
680 return smc_connect_abort(smc, SMC_CLC_DECL_MEM,
681 ini->cln_first_contact);
682
683 smc_conn_save_peer_info(smc, aclc);
684 smc_close_init(smc);
685 smc_rx_init(smc);
686 smc_tx_init(smc);
687
688 rc = smc_clc_send_confirm(smc);
689 if (rc)
690 return smc_connect_abort(smc, rc, ini->cln_first_contact);
691 mutex_unlock(&smc_server_lgr_pending);
692
693 smc_copy_sock_settings_to_clc(smc);
694 smc->connect_nonblock = 0;
695 if (smc->sk.sk_state == SMC_INIT)
696 smc->sk.sk_state = SMC_ACTIVE;
697
698 return 0;
699}
700
701/* perform steps before actually connecting */
702static int __smc_connect(struct smc_sock *smc)
703{
704 bool ism_supported = false, rdma_supported = false;
705 struct smc_clc_msg_accept_confirm aclc;
706 struct smc_init_info ini = {0};
707 int smc_type;
708 int rc = 0;
709
710 if (smc->use_fallback)
711 return smc_connect_fallback(smc, smc->fallback_rsn);
712
713 /* if peer has not signalled SMC-capability, fall back */
714 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
715 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
716
717 /* IPSec connections opt out of SMC-R optimizations */
718 if (using_ipsec(smc))
719 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC);
720
721 /* get vlan id from IP device */
722 if (smc_vlan_by_tcpsk(smc->clcsock, &ini))
723 return smc_connect_decline_fallback(smc,
724 SMC_CLC_DECL_GETVLANERR);
725
726 /* check if there is an ism device available */
727 if (!smc_find_ism_device(smc, &ini) &&
728 !smc_connect_ism_vlan_setup(smc, &ini)) {
729 /* ISM is supported for this connection */
730 ism_supported = true;
731 smc_type = SMC_TYPE_D;
732 }
733
734 /* check if there is a rdma device available */
735 if (!smc_find_rdma_device(smc, &ini)) {
736 /* RDMA is supported for this connection */
737 rdma_supported = true;
738 if (ism_supported)
739 smc_type = SMC_TYPE_B; /* both */
740 else
741 smc_type = SMC_TYPE_R; /* only RDMA */
742 }
743
744 /* if neither ISM nor RDMA are supported, fallback */
745 if (!rdma_supported && !ism_supported)
746 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV);
747
748 /* perform CLC handshake */
749 rc = smc_connect_clc(smc, smc_type, &aclc, &ini);
750 if (rc) {
751 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
752 return smc_connect_decline_fallback(smc, rc);
753 }
754
755 /* depending on previous steps, connect using rdma or ism */
756 if (rdma_supported && aclc.hdr.path == SMC_TYPE_R)
757 rc = smc_connect_rdma(smc, &aclc, &ini);
758 else if (ism_supported && aclc.hdr.path == SMC_TYPE_D)
759 rc = smc_connect_ism(smc, &aclc, &ini);
760 else
761 rc = SMC_CLC_DECL_MODEUNSUPP;
762 if (rc) {
763 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
764 return smc_connect_decline_fallback(smc, rc);
765 }
766
767 smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini);
768 return 0;
769}
770
771static void smc_connect_work(struct work_struct *work)
772{
773 struct smc_sock *smc = container_of(work, struct smc_sock,
774 connect_work);
775 long timeo = smc->sk.sk_sndtimeo;
776 int rc = 0;
777
778 if (!timeo)
779 timeo = MAX_SCHEDULE_TIMEOUT;
780 lock_sock(smc->clcsock->sk);
781 if (smc->clcsock->sk->sk_err) {
782 smc->sk.sk_err = smc->clcsock->sk->sk_err;
783 } else if ((1 << smc->clcsock->sk->sk_state) &
784 (TCPF_SYN_SENT | TCP_SYN_RECV)) {
785 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
786 if ((rc == -EPIPE) &&
787 ((1 << smc->clcsock->sk->sk_state) &
788 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
789 rc = 0;
790 }
791 release_sock(smc->clcsock->sk);
792 lock_sock(&smc->sk);
793 if (rc != 0 || smc->sk.sk_err) {
794 smc->sk.sk_state = SMC_CLOSED;
795 if (rc == -EPIPE || rc == -EAGAIN)
796 smc->sk.sk_err = EPIPE;
797 else if (signal_pending(current))
798 smc->sk.sk_err = -sock_intr_errno(timeo);
799 sock_put(&smc->sk); /* passive closing */
800 goto out;
801 }
802
803 rc = __smc_connect(smc);
804 if (rc < 0)
805 smc->sk.sk_err = -rc;
806
807out:
808 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
809 if (smc->sk.sk_err) {
810 smc->sk.sk_state_change(&smc->sk);
811 } else { /* allow polling before and after fallback decision */
812 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
813 smc->sk.sk_write_space(&smc->sk);
814 }
815 }
816 release_sock(&smc->sk);
817}
818
819static int smc_connect(struct socket *sock, struct sockaddr *addr,
820 int alen, int flags)
821{
822 struct sock *sk = sock->sk;
823 struct smc_sock *smc;
824 int rc = -EINVAL;
825
826 smc = smc_sk(sk);
827
828 /* separate smc parameter checking to be safe */
829 if (alen < sizeof(addr->sa_family))
830 goto out_err;
831 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
832 goto out_err;
833
834 lock_sock(sk);
835 switch (sk->sk_state) {
836 default:
837 goto out;
838 case SMC_ACTIVE:
839 rc = -EISCONN;
840 goto out;
841 case SMC_INIT:
842 rc = 0;
843 break;
844 }
845
846 smc_copy_sock_settings_to_clc(smc);
847 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
848 if (smc->connect_nonblock) {
849 rc = -EALREADY;
850 goto out;
851 }
852 rc = kernel_connect(smc->clcsock, addr, alen, flags);
853 if (rc && rc != -EINPROGRESS)
854 goto out;
855
856 sock_hold(&smc->sk); /* sock put in passive closing */
857 if (flags & O_NONBLOCK) {
858 if (schedule_work(&smc->connect_work))
859 smc->connect_nonblock = 1;
860 rc = -EINPROGRESS;
861 } else {
862 rc = __smc_connect(smc);
863 if (rc < 0)
864 goto out;
865 else
866 rc = 0; /* success cases including fallback */
867 }
868
869out:
870 release_sock(sk);
871out_err:
872 return rc;
873}
874
875static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
876{
877 struct socket *new_clcsock = NULL;
878 struct sock *lsk = &lsmc->sk;
879 struct sock *new_sk;
880 int rc = -EINVAL;
881
882 release_sock(lsk);
883 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
884 if (!new_sk) {
885 rc = -ENOMEM;
886 lsk->sk_err = ENOMEM;
887 *new_smc = NULL;
888 lock_sock(lsk);
889 goto out;
890 }
891 *new_smc = smc_sk(new_sk);
892
893 mutex_lock(&lsmc->clcsock_release_lock);
894 if (lsmc->clcsock)
895 rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
896 mutex_unlock(&lsmc->clcsock_release_lock);
897 lock_sock(lsk);
898 if (rc < 0)
899 lsk->sk_err = -rc;
900 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
901 new_sk->sk_prot->unhash(new_sk);
902 if (new_clcsock)
903 sock_release(new_clcsock);
904 new_sk->sk_state = SMC_CLOSED;
905 sock_set_flag(new_sk, SOCK_DEAD);
906 sock_put(new_sk); /* final */
907 *new_smc = NULL;
908 goto out;
909 }
910
911 (*new_smc)->clcsock = new_clcsock;
912out:
913 return rc;
914}
915
916/* add a just created sock to the accept queue of the listen sock as
917 * candidate for a following socket accept call from user space
918 */
919static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
920{
921 struct smc_sock *par = smc_sk(parent);
922
923 sock_hold(sk); /* sock_put in smc_accept_unlink () */
924 spin_lock(&par->accept_q_lock);
925 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
926 spin_unlock(&par->accept_q_lock);
927 sk_acceptq_added(parent);
928}
929
930/* remove a socket from the accept queue of its parental listening socket */
931static void smc_accept_unlink(struct sock *sk)
932{
933 struct smc_sock *par = smc_sk(sk)->listen_smc;
934
935 spin_lock(&par->accept_q_lock);
936 list_del_init(&smc_sk(sk)->accept_q);
937 spin_unlock(&par->accept_q_lock);
938 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
939 sock_put(sk); /* sock_hold in smc_accept_enqueue */
940}
941
942/* remove a sock from the accept queue to bind it to a new socket created
943 * for a socket accept call from user space
944 */
945struct sock *smc_accept_dequeue(struct sock *parent,
946 struct socket *new_sock)
947{
948 struct smc_sock *isk, *n;
949 struct sock *new_sk;
950
951 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
952 new_sk = (struct sock *)isk;
953
954 smc_accept_unlink(new_sk);
955 if (new_sk->sk_state == SMC_CLOSED) {
956 new_sk->sk_prot->unhash(new_sk);
957 if (isk->clcsock) {
958 sock_release(isk->clcsock);
959 isk->clcsock = NULL;
960 }
961 sock_put(new_sk); /* final */
962 continue;
963 }
964 if (new_sock) {
965 sock_graft(new_sk, new_sock);
966 if (isk->use_fallback) {
967 smc_sk(new_sk)->clcsock->file = new_sock->file;
968 isk->clcsock->file->private_data = isk->clcsock;
969 }
970 }
971 return new_sk;
972 }
973 return NULL;
974}
975
976/* clean up for a created but never accepted sock */
977void smc_close_non_accepted(struct sock *sk)
978{
979 struct smc_sock *smc = smc_sk(sk);
980
981 lock_sock(sk);
982 if (!sk->sk_lingertime)
983 /* wait for peer closing */
984 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
985 __smc_release(smc);
986 release_sock(sk);
987 sock_put(sk); /* final sock_put */
988}
989
990static int smc_serv_conf_first_link(struct smc_sock *smc)
991{
992 struct net *net = sock_net(smc->clcsock->sk);
993 struct smc_link_group *lgr = smc->conn.lgr;
994 struct smc_link *link;
995 int rest;
996 int rc;
997
998 link = &lgr->lnk[SMC_SINGLE_LINK];
999
1000 if (smc_reg_rmb(link, smc->conn.rmb_desc, false))
1001 return SMC_CLC_DECL_ERR_REGRMB;
1002
1003 /* send CONFIRM LINK request to client over the RoCE fabric */
1004 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
1005 if (rc < 0)
1006 return SMC_CLC_DECL_TIMEOUT_CL;
1007
1008 /* receive CONFIRM LINK response from client over the RoCE fabric */
1009 rest = wait_for_completion_interruptible_timeout(
1010 &link->llc_confirm_resp,
1011 SMC_LLC_WAIT_FIRST_TIME);
1012 if (rest <= 0) {
1013 struct smc_clc_msg_decline dclc;
1014
1015 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1016 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1017 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
1018 }
1019
1020 if (link->llc_confirm_resp_rc)
1021 return SMC_CLC_DECL_RMBE_EC;
1022
1023 /* send ADD LINK request to client over the RoCE fabric */
1024 rc = smc_llc_send_add_link(link,
1025 link->smcibdev->mac[link->ibport - 1],
1026 link->gid, SMC_LLC_REQ);
1027 if (rc < 0)
1028 return SMC_CLC_DECL_TIMEOUT_AL;
1029
1030 /* receive ADD LINK response from client over the RoCE fabric */
1031 rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp,
1032 SMC_LLC_WAIT_TIME);
1033 if (rest <= 0) {
1034 struct smc_clc_msg_decline dclc;
1035
1036 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
1037 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
1038 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc;
1039 }
1040
1041 smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time);
1042
1043 return 0;
1044}
1045
1046/* listen worker: finish */
1047static void smc_listen_out(struct smc_sock *new_smc)
1048{
1049 struct smc_sock *lsmc = new_smc->listen_smc;
1050 struct sock *newsmcsk = &new_smc->sk;
1051
1052 if (lsmc->sk.sk_state == SMC_LISTEN) {
1053 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
1054 smc_accept_enqueue(&lsmc->sk, newsmcsk);
1055 release_sock(&lsmc->sk);
1056 } else { /* no longer listening */
1057 smc_close_non_accepted(newsmcsk);
1058 }
1059
1060 /* Wake up accept */
1061 lsmc->sk.sk_data_ready(&lsmc->sk);
1062 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1063}
1064
1065/* listen worker: finish in state connected */
1066static void smc_listen_out_connected(struct smc_sock *new_smc)
1067{
1068 struct sock *newsmcsk = &new_smc->sk;
1069
1070 sk_refcnt_debug_inc(newsmcsk);
1071 if (newsmcsk->sk_state == SMC_INIT)
1072 newsmcsk->sk_state = SMC_ACTIVE;
1073
1074 smc_listen_out(new_smc);
1075}
1076
1077/* listen worker: finish in error state */
1078static void smc_listen_out_err(struct smc_sock *new_smc)
1079{
1080 struct sock *newsmcsk = &new_smc->sk;
1081
1082 if (newsmcsk->sk_state == SMC_INIT)
1083 sock_put(&new_smc->sk); /* passive closing */
1084 newsmcsk->sk_state = SMC_CLOSED;
1085 smc_conn_free(&new_smc->conn);
1086
1087 smc_listen_out(new_smc);
1088}
1089
1090/* listen worker: decline and fall back if possible */
1091static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
1092 int local_contact)
1093{
1094 /* RDMA setup failed, switch back to TCP */
1095 if (local_contact == SMC_FIRST_CONTACT)
1096 smc_lgr_forget(new_smc->conn.lgr);
1097 if (reason_code < 0) { /* error, no fallback possible */
1098 smc_listen_out_err(new_smc);
1099 return;
1100 }
1101 smc_conn_free(&new_smc->conn);
1102 smc_switch_to_fallback(new_smc);
1103 new_smc->fallback_rsn = reason_code;
1104 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
1105 if (smc_clc_send_decline(new_smc, reason_code) < 0) {
1106 smc_listen_out_err(new_smc);
1107 return;
1108 }
1109 }
1110 smc_listen_out_connected(new_smc);
1111}
1112
1113/* listen worker: check prefixes */
1114static int smc_listen_prfx_check(struct smc_sock *new_smc,
1115 struct smc_clc_msg_proposal *pclc)
1116{
1117 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1118 struct socket *newclcsock = new_smc->clcsock;
1119
1120 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1121 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
1122 return SMC_CLC_DECL_DIFFPREFIX;
1123
1124 return 0;
1125}
1126
1127/* listen worker: initialize connection and buffers */
1128static int smc_listen_rdma_init(struct smc_sock *new_smc,
1129 struct smc_init_info *ini)
1130{
1131 int rc;
1132
1133 /* allocate connection / link group */
1134 rc = smc_conn_create(new_smc, ini);
1135 if (rc)
1136 return rc;
1137
1138 /* create send buffer and rmb */
1139 if (smc_buf_create(new_smc, false))
1140 return SMC_CLC_DECL_MEM;
1141
1142 return 0;
1143}
1144
1145/* listen worker: initialize connection and buffers for SMC-D */
1146static int smc_listen_ism_init(struct smc_sock *new_smc,
1147 struct smc_clc_msg_proposal *pclc,
1148 struct smc_init_info *ini)
1149{
1150 struct smc_clc_msg_smcd *pclc_smcd;
1151 int rc;
1152
1153 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1154 ini->ism_gid = pclc_smcd->gid;
1155 rc = smc_conn_create(new_smc, ini);
1156 if (rc)
1157 return rc;
1158
1159 /* Check if peer can be reached via ISM device */
1160 if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid,
1161 new_smc->conn.lgr->vlan_id,
1162 new_smc->conn.lgr->smcd)) {
1163 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1164 smc_lgr_forget(new_smc->conn.lgr);
1165 smc_conn_free(&new_smc->conn);
1166 return SMC_CLC_DECL_SMCDNOTALK;
1167 }
1168
1169 /* Create send and receive buffers */
1170 if (smc_buf_create(new_smc, true)) {
1171 if (ini->cln_first_contact == SMC_FIRST_CONTACT)
1172 smc_lgr_forget(new_smc->conn.lgr);
1173 smc_conn_free(&new_smc->conn);
1174 return SMC_CLC_DECL_MEM;
1175 }
1176
1177 return 0;
1178}
1179
1180/* listen worker: register buffers */
1181static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact)
1182{
1183 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1184
1185 if (local_contact != SMC_FIRST_CONTACT) {
1186 if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true))
1187 return SMC_CLC_DECL_ERR_REGRMB;
1188 }
1189 smc_rmb_sync_sg_for_device(&new_smc->conn);
1190
1191 return 0;
1192}
1193
1194/* listen worker: finish RDMA setup */
1195static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1196 struct smc_clc_msg_accept_confirm *cclc,
1197 int local_contact)
1198{
1199 struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK];
1200 int reason_code = 0;
1201
1202 if (local_contact == SMC_FIRST_CONTACT)
1203 smc_link_save_peer_info(link, cclc);
1204
1205 if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) {
1206 reason_code = SMC_CLC_DECL_ERR_RTOK;
1207 goto decline;
1208 }
1209
1210 if (local_contact == SMC_FIRST_CONTACT) {
1211 if (smc_ib_ready_link(link)) {
1212 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1213 goto decline;
1214 }
1215 /* QP confirmation over RoCE fabric */
1216 reason_code = smc_serv_conf_first_link(new_smc);
1217 if (reason_code)
1218 goto decline;
1219 }
1220 return 0;
1221
1222decline:
1223 smc_listen_decline(new_smc, reason_code, local_contact);
1224 return reason_code;
1225}
1226
1227/* setup for RDMA connection of server */
1228static void smc_listen_work(struct work_struct *work)
1229{
1230 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1231 smc_listen_work);
1232 struct socket *newclcsock = new_smc->clcsock;
1233 struct smc_clc_msg_accept_confirm cclc;
1234 struct smc_clc_msg_proposal *pclc;
1235 struct smc_init_info ini = {0};
1236 bool ism_supported = false;
1237 u8 buf[SMC_CLC_MAX_LEN];
1238 int rc = 0;
1239
1240 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1241 return smc_listen_out_err(new_smc);
1242
1243 if (new_smc->use_fallback) {
1244 smc_listen_out_connected(new_smc);
1245 return;
1246 }
1247
1248 /* check if peer is smc capable */
1249 if (!tcp_sk(newclcsock->sk)->syn_smc) {
1250 smc_switch_to_fallback(new_smc);
1251 new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC;
1252 smc_listen_out_connected(new_smc);
1253 return;
1254 }
1255
1256 /* do inband token exchange -
1257 * wait for and receive SMC Proposal CLC message
1258 */
1259 pclc = (struct smc_clc_msg_proposal *)&buf;
1260 rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
1261 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
1262 if (rc)
1263 goto out_decl;
1264
1265 /* IPSec connections opt out of SMC-R optimizations */
1266 if (using_ipsec(new_smc)) {
1267 rc = SMC_CLC_DECL_IPSEC;
1268 goto out_decl;
1269 }
1270
1271 /* check for matching IP prefix and subnet length */
1272 rc = smc_listen_prfx_check(new_smc, pclc);
1273 if (rc)
1274 goto out_decl;
1275
1276 /* get vlan id from IP device */
1277 if (smc_vlan_by_tcpsk(new_smc->clcsock, &ini)) {
1278 rc = SMC_CLC_DECL_GETVLANERR;
1279 goto out_decl;
1280 }
1281
1282 mutex_lock(&smc_server_lgr_pending);
1283 smc_close_init(new_smc);
1284 smc_rx_init(new_smc);
1285 smc_tx_init(new_smc);
1286
1287 /* check if ISM is available */
1288 if (pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) {
1289 ini.is_smcd = true; /* prepare ISM check */
1290 rc = smc_find_ism_device(new_smc, &ini);
1291 if (!rc)
1292 rc = smc_listen_ism_init(new_smc, pclc, &ini);
1293 if (!rc)
1294 ism_supported = true;
1295 else if (pclc->hdr.path == SMC_TYPE_D)
1296 goto out_unlock; /* skip RDMA and decline */
1297 }
1298
1299 /* check if RDMA is available */
1300 if (!ism_supported) { /* SMC_TYPE_R or SMC_TYPE_B */
1301 /* prepare RDMA check */
1302 ini.is_smcd = false;
1303 ini.ism_dev = NULL;
1304 ini.ib_lcl = &pclc->lcl;
1305 rc = smc_find_rdma_device(new_smc, &ini);
1306 if (rc) {
1307 /* no RDMA device found */
1308 if (pclc->hdr.path == SMC_TYPE_B)
1309 /* neither ISM nor RDMA device found */
1310 rc = SMC_CLC_DECL_NOSMCDEV;
1311 goto out_unlock;
1312 }
1313 rc = smc_listen_rdma_init(new_smc, &ini);
1314 if (rc)
1315 goto out_unlock;
1316 rc = smc_listen_rdma_reg(new_smc, ini.cln_first_contact);
1317 if (rc)
1318 goto out_unlock;
1319 }
1320
1321 /* send SMC Accept CLC message */
1322 rc = smc_clc_send_accept(new_smc, ini.cln_first_contact);
1323 if (rc)
1324 goto out_unlock;
1325
1326 /* SMC-D does not need this lock any more */
1327 if (ism_supported)
1328 mutex_unlock(&smc_server_lgr_pending);
1329
1330 /* receive SMC Confirm CLC message */
1331 rc = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc),
1332 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1333 if (rc) {
1334 if (!ism_supported)
1335 goto out_unlock;
1336 goto out_decl;
1337 }
1338
1339 /* finish worker */
1340 if (!ism_supported) {
1341 rc = smc_listen_rdma_finish(new_smc, &cclc,
1342 ini.cln_first_contact);
1343 mutex_unlock(&smc_server_lgr_pending);
1344 if (rc)
1345 return;
1346 }
1347 smc_conn_save_peer_info(new_smc, &cclc);
1348 smc_listen_out_connected(new_smc);
1349 return;
1350
1351out_unlock:
1352 mutex_unlock(&smc_server_lgr_pending);
1353out_decl:
1354 smc_listen_decline(new_smc, rc, ini.cln_first_contact);
1355}
1356
1357static void smc_tcp_listen_work(struct work_struct *work)
1358{
1359 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1360 tcp_listen_work);
1361 struct sock *lsk = &lsmc->sk;
1362 struct smc_sock *new_smc;
1363 int rc = 0;
1364
1365 lock_sock(lsk);
1366 while (lsk->sk_state == SMC_LISTEN) {
1367 rc = smc_clcsock_accept(lsmc, &new_smc);
1368 if (rc)
1369 goto out;
1370 if (!new_smc)
1371 continue;
1372
1373 new_smc->listen_smc = lsmc;
1374 new_smc->use_fallback = lsmc->use_fallback;
1375 new_smc->fallback_rsn = lsmc->fallback_rsn;
1376 sock_hold(lsk); /* sock_put in smc_listen_work */
1377 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1378 smc_copy_sock_settings_to_smc(new_smc);
1379 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1380 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
1381 sock_hold(&new_smc->sk); /* sock_put in passive closing */
1382 if (!schedule_work(&new_smc->smc_listen_work))
1383 sock_put(&new_smc->sk);
1384 }
1385
1386out:
1387 release_sock(lsk);
1388 sock_put(&lsmc->sk); /* sock_hold in smc_listen */
1389}
1390
1391static int smc_listen(struct socket *sock, int backlog)
1392{
1393 struct sock *sk = sock->sk;
1394 struct smc_sock *smc;
1395 int rc;
1396
1397 smc = smc_sk(sk);
1398 lock_sock(sk);
1399
1400 rc = -EINVAL;
1401 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1402 smc->connect_nonblock)
1403 goto out;
1404
1405 rc = 0;
1406 if (sk->sk_state == SMC_LISTEN) {
1407 sk->sk_max_ack_backlog = backlog;
1408 goto out;
1409 }
1410 /* some socket options are handled in core, so we could not apply
1411 * them to the clc socket -- copy smc socket options to clc socket
1412 */
1413 smc_copy_sock_settings_to_clc(smc);
1414 if (!smc->use_fallback)
1415 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
1416
1417 rc = kernel_listen(smc->clcsock, backlog);
1418 if (rc)
1419 goto out;
1420 sk->sk_max_ack_backlog = backlog;
1421 sk->sk_ack_backlog = 0;
1422 sk->sk_state = SMC_LISTEN;
1423 sock_hold(sk); /* sock_hold in tcp_listen_worker */
1424 if (!schedule_work(&smc->tcp_listen_work))
1425 sock_put(sk);
1426
1427out:
1428 release_sock(sk);
1429 return rc;
1430}
1431
1432static int smc_accept(struct socket *sock, struct socket *new_sock,
1433 int flags, bool kern)
1434{
1435 struct sock *sk = sock->sk, *nsk;
1436 DECLARE_WAITQUEUE(wait, current);
1437 struct smc_sock *lsmc;
1438 long timeo;
1439 int rc = 0;
1440
1441 lsmc = smc_sk(sk);
1442 sock_hold(sk); /* sock_put below */
1443 lock_sock(sk);
1444
1445 if (lsmc->sk.sk_state != SMC_LISTEN) {
1446 rc = -EINVAL;
1447 release_sock(sk);
1448 goto out;
1449 }
1450
1451 /* Wait for an incoming connection */
1452 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1453 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1454 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1455 set_current_state(TASK_INTERRUPTIBLE);
1456 if (!timeo) {
1457 rc = -EAGAIN;
1458 break;
1459 }
1460 release_sock(sk);
1461 timeo = schedule_timeout(timeo);
1462 /* wakeup by sk_data_ready in smc_listen_work() */
1463 sched_annotate_sleep();
1464 lock_sock(sk);
1465 if (signal_pending(current)) {
1466 rc = sock_intr_errno(timeo);
1467 break;
1468 }
1469 }
1470 set_current_state(TASK_RUNNING);
1471 remove_wait_queue(sk_sleep(sk), &wait);
1472
1473 if (!rc)
1474 rc = sock_error(nsk);
1475 release_sock(sk);
1476 if (rc)
1477 goto out;
1478
1479 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1480 /* wait till data arrives on the socket */
1481 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1482 MSEC_PER_SEC);
1483 if (smc_sk(nsk)->use_fallback) {
1484 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1485
1486 lock_sock(clcsk);
1487 if (skb_queue_empty(&clcsk->sk_receive_queue))
1488 sk_wait_data(clcsk, &timeo, NULL);
1489 release_sock(clcsk);
1490 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1491 lock_sock(nsk);
1492 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
1493 release_sock(nsk);
1494 }
1495 }
1496
1497out:
1498 sock_put(sk); /* sock_hold above */
1499 return rc;
1500}
1501
1502static int smc_getname(struct socket *sock, struct sockaddr *addr,
1503 int peer)
1504{
1505 struct smc_sock *smc;
1506
1507 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
1508 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
1509 return -ENOTCONN;
1510
1511 smc = smc_sk(sock->sk);
1512
1513 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
1514}
1515
1516static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
1517{
1518 struct sock *sk = sock->sk;
1519 struct smc_sock *smc;
1520 int rc = -EPIPE;
1521
1522 smc = smc_sk(sk);
1523 lock_sock(sk);
1524 if ((sk->sk_state != SMC_ACTIVE) &&
1525 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1526 (sk->sk_state != SMC_INIT))
1527 goto out;
1528
1529 if (msg->msg_flags & MSG_FASTOPEN) {
1530 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1531 smc_switch_to_fallback(smc);
1532 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1533 } else {
1534 rc = -EINVAL;
1535 goto out;
1536 }
1537 }
1538
1539 if (smc->use_fallback)
1540 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
1541 else
1542 rc = smc_tx_sendmsg(smc, msg, len);
1543out:
1544 release_sock(sk);
1545 return rc;
1546}
1547
1548static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
1549 int flags)
1550{
1551 struct sock *sk = sock->sk;
1552 struct smc_sock *smc;
1553 int rc = -ENOTCONN;
1554
1555 smc = smc_sk(sk);
1556 lock_sock(sk);
1557 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1558 /* socket was connected before, no more data to read */
1559 rc = 0;
1560 goto out;
1561 }
1562 if ((sk->sk_state == SMC_INIT) ||
1563 (sk->sk_state == SMC_LISTEN) ||
1564 (sk->sk_state == SMC_CLOSED))
1565 goto out;
1566
1567 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1568 rc = 0;
1569 goto out;
1570 }
1571
1572 if (smc->use_fallback) {
1573 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
1574 } else {
1575 msg->msg_namelen = 0;
1576 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
1577 }
1578
1579out:
1580 release_sock(sk);
1581 return rc;
1582}
1583
1584static __poll_t smc_accept_poll(struct sock *parent)
1585{
1586 struct smc_sock *isk = smc_sk(parent);
1587 __poll_t mask = 0;
1588
1589 spin_lock(&isk->accept_q_lock);
1590 if (!list_empty(&isk->accept_q))
1591 mask = EPOLLIN | EPOLLRDNORM;
1592 spin_unlock(&isk->accept_q_lock);
1593
1594 return mask;
1595}
1596
1597static __poll_t smc_poll(struct file *file, struct socket *sock,
1598 poll_table *wait)
1599{
1600 struct sock *sk = sock->sk;
1601 struct smc_sock *smc;
1602 __poll_t mask = 0;
1603
1604 if (!sk)
1605 return EPOLLNVAL;
1606
1607 smc = smc_sk(sock->sk);
1608 if (smc->use_fallback) {
1609 /* delegate to CLC child sock */
1610 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
1611 sk->sk_err = smc->clcsock->sk->sk_err;
1612 } else {
1613 if (sk->sk_state != SMC_CLOSED)
1614 sock_poll_wait(file, sock, wait);
1615 if (sk->sk_err)
1616 mask |= EPOLLERR;
1617 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
1618 (sk->sk_state == SMC_CLOSED))
1619 mask |= EPOLLHUP;
1620 if (sk->sk_state == SMC_LISTEN) {
1621 /* woken up by sk_data_ready in smc_listen_work() */
1622 mask |= smc_accept_poll(sk);
1623 } else if (smc->use_fallback) { /* as result of connect_work()*/
1624 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
1625 wait);
1626 sk->sk_err = smc->clcsock->sk->sk_err;
1627 } else {
1628 if ((sk->sk_state != SMC_INIT &&
1629 atomic_read(&smc->conn.sndbuf_space)) ||
1630 sk->sk_shutdown & SEND_SHUTDOWN) {
1631 mask |= EPOLLOUT | EPOLLWRNORM;
1632 } else {
1633 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1634 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
1635 }
1636 if (atomic_read(&smc->conn.bytes_to_rcv))
1637 mask |= EPOLLIN | EPOLLRDNORM;
1638 if (sk->sk_shutdown & RCV_SHUTDOWN)
1639 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
1640 if (sk->sk_state == SMC_APPCLOSEWAIT1)
1641 mask |= EPOLLIN;
1642 if (smc->conn.urg_state == SMC_URG_VALID)
1643 mask |= EPOLLPRI;
1644 }
1645 }
1646
1647 return mask;
1648}
1649
1650static int smc_shutdown(struct socket *sock, int how)
1651{
1652 struct sock *sk = sock->sk;
1653 struct smc_sock *smc;
1654 int rc = -EINVAL;
1655 int rc1 = 0;
1656
1657 smc = smc_sk(sk);
1658
1659 if ((how < SHUT_RD) || (how > SHUT_RDWR))
1660 return rc;
1661
1662 lock_sock(sk);
1663
1664 rc = -ENOTCONN;
1665 if ((sk->sk_state != SMC_ACTIVE) &&
1666 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
1667 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
1668 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
1669 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
1670 (sk->sk_state != SMC_APPFINCLOSEWAIT))
1671 goto out;
1672 if (smc->use_fallback) {
1673 rc = kernel_sock_shutdown(smc->clcsock, how);
1674 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1675 if (sk->sk_shutdown == SHUTDOWN_MASK)
1676 sk->sk_state = SMC_CLOSED;
1677 goto out;
1678 }
1679 switch (how) {
1680 case SHUT_RDWR: /* shutdown in both directions */
1681 rc = smc_close_active(smc);
1682 break;
1683 case SHUT_WR:
1684 rc = smc_close_shutdown_write(smc);
1685 break;
1686 case SHUT_RD:
1687 rc = 0;
1688 /* nothing more to do because peer is not involved */
1689 break;
1690 }
1691 if (smc->clcsock)
1692 rc1 = kernel_sock_shutdown(smc->clcsock, how);
1693 /* map sock_shutdown_cmd constants to sk_shutdown value range */
1694 sk->sk_shutdown |= how + 1;
1695
1696out:
1697 release_sock(sk);
1698 return rc ? rc : rc1;
1699}
1700
1701static int smc_setsockopt(struct socket *sock, int level, int optname,
1702 char __user *optval, unsigned int optlen)
1703{
1704 struct sock *sk = sock->sk;
1705 struct smc_sock *smc;
1706 int val, rc;
1707
1708 smc = smc_sk(sk);
1709
1710 /* generic setsockopts reaching us here always apply to the
1711 * CLC socket
1712 */
1713 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
1714 optval, optlen);
1715 if (smc->clcsock->sk->sk_err) {
1716 sk->sk_err = smc->clcsock->sk->sk_err;
1717 sk->sk_error_report(sk);
1718 }
1719 if (rc)
1720 return rc;
1721
1722 if (optlen < sizeof(int))
1723 return -EINVAL;
1724 if (get_user(val, (int __user *)optval))
1725 return -EFAULT;
1726
1727 lock_sock(sk);
1728 switch (optname) {
1729 case TCP_ULP:
1730 case TCP_FASTOPEN:
1731 case TCP_FASTOPEN_CONNECT:
1732 case TCP_FASTOPEN_KEY:
1733 case TCP_FASTOPEN_NO_COOKIE:
1734 /* option not supported by SMC */
1735 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
1736 smc_switch_to_fallback(smc);
1737 smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP;
1738 } else {
1739 if (!smc->use_fallback)
1740 rc = -EINVAL;
1741 }
1742 break;
1743 case TCP_NODELAY:
1744 if (sk->sk_state != SMC_INIT &&
1745 sk->sk_state != SMC_LISTEN &&
1746 sk->sk_state != SMC_CLOSED) {
1747 if (val && !smc->use_fallback)
1748 mod_delayed_work(system_wq, &smc->conn.tx_work,
1749 0);
1750 }
1751 break;
1752 case TCP_CORK:
1753 if (sk->sk_state != SMC_INIT &&
1754 sk->sk_state != SMC_LISTEN &&
1755 sk->sk_state != SMC_CLOSED) {
1756 if (!val && !smc->use_fallback)
1757 mod_delayed_work(system_wq, &smc->conn.tx_work,
1758 0);
1759 }
1760 break;
1761 case TCP_DEFER_ACCEPT:
1762 smc->sockopt_defer_accept = val;
1763 break;
1764 default:
1765 break;
1766 }
1767 release_sock(sk);
1768
1769 return rc;
1770}
1771
1772static int smc_getsockopt(struct socket *sock, int level, int optname,
1773 char __user *optval, int __user *optlen)
1774{
1775 struct smc_sock *smc;
1776
1777 smc = smc_sk(sock->sk);
1778 /* socket options apply to the CLC socket */
1779 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
1780 optval, optlen);
1781}
1782
1783static int smc_ioctl(struct socket *sock, unsigned int cmd,
1784 unsigned long arg)
1785{
1786 union smc_host_cursor cons, urg;
1787 struct smc_connection *conn;
1788 struct smc_sock *smc;
1789 int answ;
1790
1791 smc = smc_sk(sock->sk);
1792 conn = &smc->conn;
1793 lock_sock(&smc->sk);
1794 if (smc->use_fallback) {
1795 if (!smc->clcsock) {
1796 release_sock(&smc->sk);
1797 return -EBADF;
1798 }
1799 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
1800 release_sock(&smc->sk);
1801 return answ;
1802 }
1803 switch (cmd) {
1804 case SIOCINQ: /* same as FIONREAD */
1805 if (smc->sk.sk_state == SMC_LISTEN) {
1806 release_sock(&smc->sk);
1807 return -EINVAL;
1808 }
1809 if (smc->sk.sk_state == SMC_INIT ||
1810 smc->sk.sk_state == SMC_CLOSED)
1811 answ = 0;
1812 else
1813 answ = atomic_read(&smc->conn.bytes_to_rcv);
1814 break;
1815 case SIOCOUTQ:
1816 /* output queue size (not send + not acked) */
1817 if (smc->sk.sk_state == SMC_LISTEN) {
1818 release_sock(&smc->sk);
1819 return -EINVAL;
1820 }
1821 if (smc->sk.sk_state == SMC_INIT ||
1822 smc->sk.sk_state == SMC_CLOSED)
1823 answ = 0;
1824 else
1825 answ = smc->conn.sndbuf_desc->len -
1826 atomic_read(&smc->conn.sndbuf_space);
1827 break;
1828 case SIOCOUTQNSD:
1829 /* output queue size (not send only) */
1830 if (smc->sk.sk_state == SMC_LISTEN) {
1831 release_sock(&smc->sk);
1832 return -EINVAL;
1833 }
1834 if (smc->sk.sk_state == SMC_INIT ||
1835 smc->sk.sk_state == SMC_CLOSED)
1836 answ = 0;
1837 else
1838 answ = smc_tx_prepared_sends(&smc->conn);
1839 break;
1840 case SIOCATMARK:
1841 if (smc->sk.sk_state == SMC_LISTEN) {
1842 release_sock(&smc->sk);
1843 return -EINVAL;
1844 }
1845 if (smc->sk.sk_state == SMC_INIT ||
1846 smc->sk.sk_state == SMC_CLOSED) {
1847 answ = 0;
1848 } else {
1849 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
1850 smc_curs_copy(&urg, &conn->urg_curs, conn);
1851 answ = smc_curs_diff(conn->rmb_desc->len,
1852 &cons, &urg) == 1;
1853 }
1854 break;
1855 default:
1856 release_sock(&smc->sk);
1857 return -ENOIOCTLCMD;
1858 }
1859 release_sock(&smc->sk);
1860
1861 return put_user(answ, (int __user *)arg);
1862}
1863
1864static ssize_t smc_sendpage(struct socket *sock, struct page *page,
1865 int offset, size_t size, int flags)
1866{
1867 struct sock *sk = sock->sk;
1868 struct smc_sock *smc;
1869 int rc = -EPIPE;
1870
1871 smc = smc_sk(sk);
1872 lock_sock(sk);
1873 if (sk->sk_state != SMC_ACTIVE) {
1874 release_sock(sk);
1875 goto out;
1876 }
1877 release_sock(sk);
1878 if (smc->use_fallback)
1879 rc = kernel_sendpage(smc->clcsock, page, offset,
1880 size, flags);
1881 else
1882 rc = sock_no_sendpage(sock, page, offset, size, flags);
1883
1884out:
1885 return rc;
1886}
1887
1888/* Map the affected portions of the rmbe into an spd, note the number of bytes
1889 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
1890 * updates till whenever a respective page has been fully processed.
1891 * Note that subsequent recv() calls have to wait till all splice() processing
1892 * completed.
1893 */
1894static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
1895 struct pipe_inode_info *pipe, size_t len,
1896 unsigned int flags)
1897{
1898 struct sock *sk = sock->sk;
1899 struct smc_sock *smc;
1900 int rc = -ENOTCONN;
1901
1902 smc = smc_sk(sk);
1903 lock_sock(sk);
1904 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
1905 /* socket was connected before, no more data to read */
1906 rc = 0;
1907 goto out;
1908 }
1909 if (sk->sk_state == SMC_INIT ||
1910 sk->sk_state == SMC_LISTEN ||
1911 sk->sk_state == SMC_CLOSED)
1912 goto out;
1913
1914 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
1915 rc = 0;
1916 goto out;
1917 }
1918
1919 if (smc->use_fallback) {
1920 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
1921 pipe, len, flags);
1922 } else {
1923 if (*ppos) {
1924 rc = -ESPIPE;
1925 goto out;
1926 }
1927 if (flags & SPLICE_F_NONBLOCK)
1928 flags = MSG_DONTWAIT;
1929 else
1930 flags = 0;
1931 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
1932 }
1933out:
1934 release_sock(sk);
1935
1936 return rc;
1937}
1938
1939/* must look like tcp */
1940static const struct proto_ops smc_sock_ops = {
1941 .family = PF_SMC,
1942 .owner = THIS_MODULE,
1943 .release = smc_release,
1944 .bind = smc_bind,
1945 .connect = smc_connect,
1946 .socketpair = sock_no_socketpair,
1947 .accept = smc_accept,
1948 .getname = smc_getname,
1949 .poll = smc_poll,
1950 .ioctl = smc_ioctl,
1951 .listen = smc_listen,
1952 .shutdown = smc_shutdown,
1953 .setsockopt = smc_setsockopt,
1954 .getsockopt = smc_getsockopt,
1955 .sendmsg = smc_sendmsg,
1956 .recvmsg = smc_recvmsg,
1957 .mmap = sock_no_mmap,
1958 .sendpage = smc_sendpage,
1959 .splice_read = smc_splice_read,
1960};
1961
1962static int smc_create(struct net *net, struct socket *sock, int protocol,
1963 int kern)
1964{
1965 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
1966 struct smc_sock *smc;
1967 struct sock *sk;
1968 int rc;
1969
1970 rc = -ESOCKTNOSUPPORT;
1971 if (sock->type != SOCK_STREAM)
1972 goto out;
1973
1974 rc = -EPROTONOSUPPORT;
1975 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
1976 goto out;
1977
1978 rc = -ENOBUFS;
1979 sock->ops = &smc_sock_ops;
1980 sk = smc_sock_alloc(net, sock, protocol);
1981 if (!sk)
1982 goto out;
1983
1984 /* create internal TCP socket for CLC handshake and fallback */
1985 smc = smc_sk(sk);
1986 smc->use_fallback = false; /* assume rdma capability first */
1987 smc->fallback_rsn = 0;
1988 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
1989 &smc->clcsock);
1990 if (rc) {
1991 sk_common_release(sk);
1992 goto out;
1993 }
1994 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
1995 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
1996
1997out:
1998 return rc;
1999}
2000
2001static const struct net_proto_family smc_sock_family_ops = {
2002 .family = PF_SMC,
2003 .owner = THIS_MODULE,
2004 .create = smc_create,
2005};
2006
2007unsigned int smc_net_id;
2008
2009static __net_init int smc_net_init(struct net *net)
2010{
2011 return smc_pnet_net_init(net);
2012}
2013
2014static void __net_exit smc_net_exit(struct net *net)
2015{
2016 smc_pnet_net_exit(net);
2017}
2018
2019static struct pernet_operations smc_net_ops = {
2020 .init = smc_net_init,
2021 .exit = smc_net_exit,
2022 .id = &smc_net_id,
2023 .size = sizeof(struct smc_net),
2024};
2025
2026static int __init smc_init(void)
2027{
2028 int rc;
2029
2030 rc = register_pernet_subsys(&smc_net_ops);
2031 if (rc)
2032 return rc;
2033
2034 rc = smc_pnet_init();
2035 if (rc)
2036 goto out_pernet_subsys;
2037
2038 rc = smc_llc_init();
2039 if (rc) {
2040 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
2041 goto out_pnet;
2042 }
2043
2044 rc = smc_cdc_init();
2045 if (rc) {
2046 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
2047 goto out_pnet;
2048 }
2049
2050 rc = proto_register(&smc_proto, 1);
2051 if (rc) {
2052 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
2053 goto out_pnet;
2054 }
2055
2056 rc = proto_register(&smc_proto6, 1);
2057 if (rc) {
2058 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2059 goto out_proto;
2060 }
2061
2062 rc = sock_register(&smc_sock_family_ops);
2063 if (rc) {
2064 pr_err("%s: sock_register fails with %d\n", __func__, rc);
2065 goto out_proto6;
2066 }
2067 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
2068 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
2069
2070 rc = smc_ib_register_client();
2071 if (rc) {
2072 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2073 goto out_sock;
2074 }
2075
2076 static_branch_enable(&tcp_have_smc);
2077 return 0;
2078
2079out_sock:
2080 sock_unregister(PF_SMC);
2081out_proto6:
2082 proto_unregister(&smc_proto6);
2083out_proto:
2084 proto_unregister(&smc_proto);
2085out_pnet:
2086 smc_pnet_exit();
2087out_pernet_subsys:
2088 unregister_pernet_subsys(&smc_net_ops);
2089
2090 return rc;
2091}
2092
2093static void __exit smc_exit(void)
2094{
2095 smc_core_exit();
2096 static_branch_disable(&tcp_have_smc);
2097 smc_ib_unregister_client();
2098 sock_unregister(PF_SMC);
2099 proto_unregister(&smc_proto6);
2100 proto_unregister(&smc_proto);
2101 smc_pnet_exit();
2102 unregister_pernet_subsys(&smc_net_ops);
2103}
2104
2105module_init(smc_init);
2106module_exit(smc_exit);
2107
2108MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2109MODULE_DESCRIPTION("smc socket address family");
2110MODULE_LICENSE("GPL");
2111MODULE_ALIAS_NETPROTO(PF_SMC);