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net/smc: Don't call clcsock shutdown twice when smc shutdown
[mirror_ubuntu-jammy-kernel.git] / net / smc / af_smc.c
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09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
ac713874
UB		 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 *
a046d57d 10 * Initial restrictions:
a046d57d 11 * - support for alternate links postponed
a046d57d 12 *
aaa4d33f 13 * Copyright IBM Corp. 2016, 2018
ac713874
UB		 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>
a046d57d 24#include <linux/workqueue.h>
5f08318f 25#include <linux/in.h>
c3edc401 26#include <linux/sched/signal.h>
41349844 27#include <linux/if_vlan.h>
4ead9c96 28#include <linux/rcupdate_wait.h>
b81a5eb7 29#include <linux/ctype.h>
c3edc401 30
ac713874 31#include <net/sock.h>
a046d57d 32#include <net/tcp.h>
f16a7dd5 33#include <net/smc.h>
9b67e26f 34#include <asm/ioctls.h>
ac713874 35
64e28b52
HW		 36#include <net/net_namespace.h>
37#include <net/netns/generic.h>
38#include "smc_netns.h"
39
ac713874 40#include "smc.h"
a046d57d 41#include "smc_clc.h"
9bf9abea 42#include "smc_llc.h"
5f08318f 43#include "smc_cdc.h"
0cfdd8f9 44#include "smc_core.h"
a4cf0443 45#include "smc_ib.h"
41349844 46#include "smc_ism.h"
6812baab 47#include "smc_pnet.h"
e8372d9d 48#include "smc_netlink.h"
e6727f39 49#include "smc_tx.h"
952310cc 50#include "smc_rx.h"
b38d7324 51#include "smc_close.h"
e0e4b8fa 52#include "smc_stats.h"
ac713874 53
72a36a8a
HW		 54static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
55 * creation on server
56 */
57static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
58 * creation on client
0cfdd8f9
UB		 59 */
60
22ef473d
KG		 61struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
62struct workqueue_struct *smc_close_wq; /* wq for close work */
63
a046d57d 64static void smc_tcp_listen_work(struct work_struct *);
24ac3a08 65static void smc_connect_work(struct work_struct *);
a046d57d 66
ac713874
UB		 67static void smc_set_keepalive(struct sock *sk, int val)
68{
69 struct smc_sock *smc = smc_sk(sk);
70
71 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
72}
73
f16a7dd5
UB		 74static struct smc_hashinfo smc_v4_hashinfo = {
75 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
76};
77
aaa4d33f
KG		 78static struct smc_hashinfo smc_v6_hashinfo = {
79 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
80};
81
f16a7dd5
UB		 82int smc_hash_sk(struct sock *sk)
83{
84 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
85 struct hlist_head *head;
86
87 head = &h->ht;
88
89 write_lock_bh(&h->lock);
90 sk_add_node(sk, head);
91 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
92 write_unlock_bh(&h->lock);
93
94 return 0;
95}
96EXPORT_SYMBOL_GPL(smc_hash_sk);
97
98void smc_unhash_sk(struct sock *sk)
99{
100 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
101
102 write_lock_bh(&h->lock);
103 if (sk_del_node_init(sk))
104 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
105 write_unlock_bh(&h->lock);
106}
107EXPORT_SYMBOL_GPL(smc_unhash_sk);
108
109struct proto smc_proto = {
ac713874
UB		 110 .name = "SMC",
111 .owner = THIS_MODULE,
112 .keepalive = smc_set_keepalive,
f16a7dd5
UB		 113 .hash = smc_hash_sk,
114 .unhash = smc_unhash_sk,
ac713874 115 .obj_size = sizeof(struct smc_sock),
f16a7dd5 116 .h.smc_hash = &smc_v4_hashinfo,
5f0d5a3a 117 .slab_flags = SLAB_TYPESAFE_BY_RCU,
ac713874 118};
f16a7dd5 119EXPORT_SYMBOL_GPL(smc_proto);
ac713874 120
aaa4d33f
KG		 121struct proto smc_proto6 = {
122 .name = "SMC6",
123 .owner = THIS_MODULE,
124 .keepalive = smc_set_keepalive,
125 .hash = smc_hash_sk,
126 .unhash = smc_unhash_sk,
127 .obj_size = sizeof(struct smc_sock),
128 .h.smc_hash = &smc_v6_hashinfo,
129 .slab_flags = SLAB_TYPESAFE_BY_RCU,
130};
131EXPORT_SYMBOL_GPL(smc_proto6);
132
f536dffc
UB		 133static void smc_restore_fallback_changes(struct smc_sock *smc)
134{
1ad24058
KG		 135 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
136 smc->clcsock->file->private_data = smc->sk.sk_socket;
137 smc->clcsock->file = NULL;
138 }
f536dffc
UB		 139}
140
39f41f36 141static int __smc_release(struct smc_sock *smc)
ac713874 142{
39f41f36 143 struct sock *sk = &smc->sk;
b38d7324 144 int rc = 0;
ac713874 145
51f1de79 146 if (!smc->use_fallback) {
b38d7324
UB		 147 rc = smc_close_active(smc);
148 sock_set_flag(sk, SOCK_DEAD);
149 sk->sk_shutdown |= SHUTDOWN_MASK;
b03faa1f 150 } else {
0cad438e
DL		 151 if (sk->sk_state != SMC_CLOSED) {
152 if (sk->sk_state != SMC_LISTEN &&
153 sk->sk_state != SMC_INIT)
154 sock_put(sk); /* passive closing */
155 if (sk->sk_state == SMC_LISTEN) {
156 /* wake up clcsock accept */
157 rc = kernel_sock_shutdown(smc->clcsock,
158 SHUT_RDWR);
159 }
160 sk->sk_state = SMC_CLOSED;
161 sk->sk_state_change(sk);
78abe3d0 162 }
f536dffc 163 smc_restore_fallback_changes(smc);
51f1de79 164 }
ac713874 165
b03faa1f
UB		 166 sk->sk_prot->unhash(sk);
167
168 if (sk->sk_state == SMC_CLOSED) {
169 if (smc->clcsock) {
fd57770d
KG		 170 release_sock(sk);
171 smc_clcsock_release(smc);
172 lock_sock(sk);
b03faa1f
UB		 173 }
174 if (!smc->use_fallback)
175 smc_conn_free(&smc->conn);
176 }
177
39f41f36
UB		 178 return rc;
179}
180
181static int smc_release(struct socket *sock)
182{
183 struct sock *sk = sock->sk;
184 struct smc_sock *smc;
185 int rc = 0;
186
187 if (!sk)
188 goto out;
189
81cf4f47 190 sock_hold(sk); /* sock_put below */
39f41f36
UB		 191 smc = smc_sk(sk);
192
193 /* cleanup for a dangling non-blocking connect */
194 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
195 tcp_abort(smc->clcsock->sk, ECONNABORTED);
196 flush_work(&smc->connect_work);
197
198 if (sk->sk_state == SMC_LISTEN)
199 /* smc_close_non_accepted() is called and acquires
200 * sock lock for child sockets again
201 */
202 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
203 else
204 lock_sock(sk);
205
206 rc = __smc_release(smc);
207
ac713874
UB		 208 /* detach socket */
209 sock_orphan(sk);
210 sock->sk = NULL;
211 release_sock(sk);
212
81cf4f47 213 sock_put(sk); /* sock_hold above */
51f1de79 214 sock_put(sk); /* final sock_put */
ac713874 215out:
b38d7324 216 return rc;
ac713874
UB		 217}
218
219static void smc_destruct(struct sock *sk)
220{
221 if (sk->sk_state != SMC_CLOSED)
222 return;
223 if (!sock_flag(sk, SOCK_DEAD))
224 return;
225
226 sk_refcnt_debug_dec(sk);
227}
228
aaa4d33f
KG		 229static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
230 int protocol)
ac713874
UB		 231{
232 struct smc_sock *smc;
aaa4d33f 233 struct proto *prot;
ac713874
UB		 234 struct sock *sk;
235
aaa4d33f
KG		 236 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
237 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
ac713874
UB		 238 if (!sk)
239 return NULL;
240
241 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
242 sk->sk_state = SMC_INIT;
243 sk->sk_destruct = smc_destruct;
aaa4d33f 244 sk->sk_protocol = protocol;
ac713874 245 smc = smc_sk(sk);
a046d57d 246 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
24ac3a08 247 INIT_WORK(&smc->connect_work, smc_connect_work);
be7f3e59 248 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
a046d57d
UB		 249 INIT_LIST_HEAD(&smc->accept_q);
250 spin_lock_init(&smc->accept_q_lock);
be7f3e59 251 spin_lock_init(&smc->conn.send_lock);
f16a7dd5 252 sk->sk_prot->hash(sk);
a046d57d 253 sk_refcnt_debug_inc(sk);
78abe3d0 254 mutex_init(&smc->clcsock_release_lock);
ac713874
UB		 255
256 return sk;
257}
258
259static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
260 int addr_len)
261{
262 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
263 struct sock *sk = sock->sk;
264 struct smc_sock *smc;
265 int rc;
266
267 smc = smc_sk(sk);
268
269 /* replicate tests from inet_bind(), to be safe wrt. future changes */
270 rc = -EINVAL;
271 if (addr_len < sizeof(struct sockaddr_in))
272 goto out;
273
274 rc = -EAFNOSUPPORT;
aaa4d33f
KG		 275 if (addr->sin_family != AF_INET &&
276 addr->sin_family != AF_INET6 &&
277 addr->sin_family != AF_UNSPEC)
278 goto out;
ac713874 279 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
aaa4d33f
KG		 280 if (addr->sin_family == AF_UNSPEC &&
281 addr->sin_addr.s_addr != htonl(INADDR_ANY))
ac713874
UB		 282 goto out;
283
284 lock_sock(sk);
285
286 /* Check if socket is already active */
287 rc = -EINVAL;
cd206360 288 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
ac713874
UB		 289 goto out_rel;
290
291 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
292 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
293
294out_rel:
295 release_sock(sk);
296out:
297 return rc;
298}
299
300static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
301 unsigned long mask)
302{
303 /* options we don't get control via setsockopt for */
304 nsk->sk_type = osk->sk_type;
305 nsk->sk_sndbuf = osk->sk_sndbuf;
306 nsk->sk_rcvbuf = osk->sk_rcvbuf;
307 nsk->sk_sndtimeo = osk->sk_sndtimeo;
308 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
309 nsk->sk_mark = osk->sk_mark;
310 nsk->sk_priority = osk->sk_priority;
311 nsk->sk_rcvlowat = osk->sk_rcvlowat;
312 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
313 nsk->sk_err = osk->sk_err;
314
315 nsk->sk_flags &= ~mask;
316 nsk->sk_flags |= osk->sk_flags & mask;
317}
318
319#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
320 (1UL << SOCK_KEEPOPEN) | \
321 (1UL << SOCK_LINGER) | \
322 (1UL << SOCK_BROADCAST) | \
323 (1UL << SOCK_TIMESTAMP) | \
324 (1UL << SOCK_DBG) | \
325 (1UL << SOCK_RCVTSTAMP) | \
326 (1UL << SOCK_RCVTSTAMPNS) | \
327 (1UL << SOCK_LOCALROUTE) | \
328 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
329 (1UL << SOCK_RXQ_OVFL) | \
330 (1UL << SOCK_WIFI_STATUS) | \
331 (1UL << SOCK_NOFCS) | \
9718475e
DD		 332 (1UL << SOCK_FILTER_LOCKED) | \
333 (1UL << SOCK_TSTAMP_NEW))
ac713874
UB		 334/* copy only relevant settings and flags of SOL_SOCKET level from smc to
335 * clc socket (since smc is not called for these options from net/core)
336 */
337static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
338{
339 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
340}
341
342#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
343 (1UL << SOCK_KEEPOPEN) | \
344 (1UL << SOCK_LINGER) | \
345 (1UL << SOCK_DBG))
346/* copy only settings and flags relevant for smc from clc to smc socket */
347static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
348{
349 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
350}
351
b9247544 352/* register the new rmb on all links */
7562a13d 353static int smcr_lgr_reg_rmbs(struct smc_link *link,
b9247544
KG		 354 struct smc_buf_desc *rmb_desc)
355{
7562a13d
KG		 356 struct smc_link_group *lgr = link->lgr;
357 int i, rc = 0;
b9247544 358
d5500667
KG		 359 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
360 if (rc)
361 return rc;
362 /* protect against parallel smc_llc_cli_rkey_exchange() and
363 * parallel smcr_link_reg_rmb()
364 */
365 mutex_lock(&lgr->llc_conf_mutex);
b9247544 366 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 367 if (!smc_link_active(&lgr->lnk[i]))
b9247544 368 continue;
7562a13d 369 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
b9247544 370 if (rc)
7562a13d 371 goto out;
44aa81ce 372 }
7562a13d
KG		 373
374 /* exchange confirm_rkey msg with peer */
375 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
376 if (rc) {
377 rc = -EFAULT;
378 goto out;
379 }
380 rmb_desc->is_conf_rkey = true;
381out:
d5500667
KG		 382 mutex_unlock(&lgr->llc_conf_mutex);
383 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
7562a13d 384 return rc;
e63a5f8c
KG		 385}
386
b9247544 387static int smcr_clnt_conf_first_link(struct smc_sock *smc)
9bf9abea 388{
387707fd 389 struct smc_link *link = smc->conn.lnk;
0fb0b02b 390 struct smc_llc_qentry *qentry;
9bf9abea
UB		 391 int rc;
392
9bf9abea 393 /* receive CONFIRM LINK request from server over RoCE fabric */
0fb0b02b
KG		 394 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
395 SMC_LLC_CONFIRM_LINK);
396 if (!qentry) {
9bf9abea
UB		 397 struct smc_clc_msg_decline dclc;
398
399 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 400 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
9ed28556 401 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
9bf9abea 402 }
649758ff 403 smc_llc_save_peer_uid(qentry);
0fb0b02b
KG		 404 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
405 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
406 if (rc)
75d320d6
KG		 407 return SMC_CLC_DECL_RMBE_EC;
408
9bf9abea
UB		 409 rc = smc_ib_modify_qp_rts(link);
410 if (rc)
603cc149 411 return SMC_CLC_DECL_ERR_RDYLNK;
9bf9abea
UB		 412
413 smc_wr_remember_qp_attr(link);
652a1e41 414
7562a13d 415 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
603cc149 416 return SMC_CLC_DECL_ERR_REGRMB;
652a1e41 417
0fb0b02b
KG		 418 /* confirm_rkey is implicit on 1st contact */
419 smc->conn.rmb_desc->is_conf_rkey = true;
420
9bf9abea 421 /* send CONFIRM LINK response over RoCE fabric */
947541f3 422 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
9bf9abea 423 if (rc < 0)
603cc149 424 return SMC_CLC_DECL_TIMEOUT_CL;
9bf9abea 425
0fb0b02b 426 smc_llc_link_active(link);
0a99be43 427 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
0fb0b02b
KG		 428
429 /* optional 2nd link, receive ADD LINK request from server */
430 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
431 SMC_LLC_ADD_LINK);
432 if (!qentry) {
52bedf37
KG		 433 struct smc_clc_msg_decline dclc;
434
435 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 436 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
0fb0b02b
KG		 437 if (rc == -EAGAIN)
438 rc = 0; /* no DECLINE received, go with one link */
439 return rc;
52bedf37 440 }
0fb0b02b 441 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
b1570a87 442 smc_llc_cli_add_link(link, qentry);
75d320d6 443 return 0;
9bf9abea
UB		 444}
445
41349844
HW		 446static void smcr_conn_save_peer_info(struct smc_sock *smc,
447 struct smc_clc_msg_accept_confirm *clc)
0cfdd8f9 448{
3d9725a6 449 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
95d8d263 450
3d9725a6
UB		 451 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
452 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
95d8d263 453 smc->conn.peer_rmbe_size = bufsize;
cd6851f3 454 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
95d8d263 455 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
0cfdd8f9
UB		 456}
457
b81a5eb7
UB		 458static bool smc_isascii(char *hostname)
459{
460 int i;
461
462 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
463 if (!isascii(hostname[i]))
464 return false;
465 return true;
466}
467
41349844
HW		 468static void smcd_conn_save_peer_info(struct smc_sock *smc,
469 struct smc_clc_msg_accept_confirm *clc)
470{
3d9725a6 471 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
41349844 472
3d9725a6
UB		 473 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
474 smc->conn.peer_token = clc->d0.token;
41349844
HW		 475 /* msg header takes up space in the buffer */
476 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
477 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
478 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
b81a5eb7
UB		 479 if (clc->hdr.version > SMC_V1 &&
480 (clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) {
481 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
482 (struct smc_clc_msg_accept_confirm_v2 *)clc;
483 struct smc_clc_first_contact_ext *fce =
484 (struct smc_clc_first_contact_ext *)
485 (((u8 *)clc_v2) + sizeof(*clc_v2));
486
487 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid,
488 SMC_MAX_EID_LEN);
489 smc->conn.lgr->peer_os = fce->os_type;
490 smc->conn.lgr->peer_smc_release = fce->release;
491 if (smc_isascii(fce->hostname))
492 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
493 SMC_MAX_HOSTNAME_LEN);
494 }
41349844
HW		 495}
496
497static void smc_conn_save_peer_info(struct smc_sock *smc,
498 struct smc_clc_msg_accept_confirm *clc)
499{
500 if (smc->conn.lgr->is_smcd)
501 smcd_conn_save_peer_info(smc, clc);
502 else
503 smcr_conn_save_peer_info(smc, clc);
504}
505
0cfdd8f9
UB		 506static void smc_link_save_peer_info(struct smc_link *link,
507 struct smc_clc_msg_accept_confirm *clc)
508{
3d9725a6
UB		 509 link->peer_qpn = ntoh24(clc->r0.qpn);
510 memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
511 memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
512 link->peer_psn = ntoh24(clc->r0.psn);
513 link->peer_mtu = clc->r0.qp_mtu;
0cfdd8f9
UB		 514}
515
e0e4b8fa
GG		 516static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
517 struct smc_stats_fback *fback_arr)
518{
519 int cnt;
520
521 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
522 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
523 fback_arr[cnt].count++;
524 break;
525 }
526 if (!fback_arr[cnt].fback_code) {
527 fback_arr[cnt].fback_code = smc->fallback_rsn;
528 fback_arr[cnt].count++;
529 break;
530 }
531 }
532}
533
534static void smc_stat_fallback(struct smc_sock *smc)
535{
194730a9
GG		 536 struct net *net = sock_net(&smc->sk);
537
538 mutex_lock(&net->smc.mutex_fback_rsn);
e0e4b8fa 539 if (smc->listen_smc) {
194730a9
GG		 540 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
541 net->smc.fback_rsn->srv_fback_cnt++;
e0e4b8fa 542 } else {
194730a9
GG		 543 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
544 net->smc.fback_rsn->clnt_fback_cnt++;
e0e4b8fa 545 }
194730a9 546 mutex_unlock(&net->smc.mutex_fback_rsn);
e0e4b8fa
GG		 547}
548
549static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
07603b23
UB		 550{
551 smc->use_fallback = true;
e0e4b8fa
GG		 552 smc->fallback_rsn = reason_code;
553 smc_stat_fallback(smc);
07603b23
UB		 554 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
555 smc->clcsock->file = smc->sk.sk_socket->file;
556 smc->clcsock->file->private_data = smc->clcsock;
67f562e3
UB		 557 smc->clcsock->wq.fasync_list =
558 smc->sk.sk_socket->wq.fasync_list;
07603b23
UB		 559 }
560}
561
3b2dec26 562/* fall back during connect */
603cc149 563static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
a046d57d 564{
e0e4b8fa 565 smc_switch_to_fallback(smc, reason_code);
3b2dec26 566 smc_copy_sock_settings_to_clc(smc);
50717a37 567 smc->connect_nonblock = 0;
3b2dec26
HW		 568 if (smc->sk.sk_state == SMC_INIT)
569 smc->sk.sk_state = SMC_ACTIVE;
570 return 0;
571}
51f1de79 572
3b2dec26 573/* decline and fall back during connect */
e8d726c8
UB		 574static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
575 u8 version)
3b2dec26 576{
194730a9 577 struct net *net = sock_net(&smc->sk);
3b2dec26 578 int rc;
ee9dfbef 579
e1bbdd57 580 if (reason_code < 0) { /* error, fallback is not possible */
194730a9 581 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
e1bbdd57
UB		 582 if (smc->sk.sk_state == SMC_INIT)
583 sock_put(&smc->sk); /* passive closing */
3b2dec26 584 return reason_code;
e1bbdd57 585 }
603cc149 586 if (reason_code != SMC_CLC_DECL_PEERDECL) {
e8d726c8 587 rc = smc_clc_send_decline(smc, reason_code, version);
e1bbdd57 588 if (rc < 0) {
194730a9 589 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
e1bbdd57
UB		 590 if (smc->sk.sk_state == SMC_INIT)
591 sock_put(&smc->sk); /* passive closing */
3b2dec26 592 return rc;
e1bbdd57 593 }
c5c1cc9c 594 }
603cc149 595 return smc_connect_fallback(smc, reason_code);
3b2dec26 596}
c5c1cc9c 597
8cf3f3e4 598static void smc_conn_abort(struct smc_sock *smc, int local_first)
3b2dec26 599{
5ac54d87 600 if (local_first)
51e3dfa8
UB		 601 smc_lgr_cleanup_early(&smc->conn);
602 else
603 smc_conn_free(&smc->conn);
3b2dec26
HW		 604}
605
606/* check if there is a rdma device available for this connection. */
607/* called for connect and listen */
228bae05 608static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
3b2dec26 609{
a046d57d
UB		 610 /* PNET table look up: search active ib_device and port
611 * within same PNETID that also contains the ethernet device
612 * used for the internal TCP socket
613 */
bc36d2fc 614 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
9aa68d29
KG		 615 if (!ini->ib_dev)
616 return SMC_CLC_DECL_NOSMCRDEV;
bc36d2fc 617 return 0;
3b2dec26
HW		 618}
619
41349844
HW		 620/* check if there is an ISM device available for this connection. */
621/* called for connect and listen */
228bae05 622static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
41349844
HW		 623{
624 /* Find ISM device with same PNETID as connecting interface */
bc36d2fc 625 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
3fc64937 626 if (!ini->ism_dev[0])
9aa68d29 627 return SMC_CLC_DECL_NOSMCDDEV;
8caaccf5
UB		 628 else
629 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
41349844
HW		 630 return 0;
631}
632
839d696f
KG		 633/* is chid unique for the ism devices that are already determined? */
634static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
635 int cnt)
636{
637 int i = (!ini->ism_dev[0]) ? 1 : 0;
638
639 for (; i < cnt; i++)
640 if (ini->ism_chid[i] == chid)
641 return false;
642 return true;
643}
644
d70bf4f7
UB		 645/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
646 * PNETID matching net_device)
647 */
648static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
649 struct smc_init_info *ini)
650{
651 int rc = SMC_CLC_DECL_NOSMCDDEV;
652 struct smcd_dev *smcd;
653 int i = 1;
839d696f 654 u16 chid;
d70bf4f7
UB		 655
656 if (smcd_indicated(ini->smc_type_v1))
657 rc = 0; /* already initialized for V1 */
658 mutex_lock(&smcd_dev_list.mutex);
659 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
660 if (smcd->going_away || smcd == ini->ism_dev[0])
661 continue;
839d696f
KG		 662 chid = smc_ism_get_chid(smcd);
663 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
664 continue;
d70bf4f7
UB		 665 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
666 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
667 ini->ism_dev[i] = smcd;
839d696f 668 ini->ism_chid[i] = chid;
d70bf4f7
UB		 669 ini->is_smcd = true;
670 rc = 0;
671 i++;
672 if (i > SMC_MAX_ISM_DEVS)
673 break;
674 }
675 }
676 mutex_unlock(&smcd_dev_list.mutex);
677 ini->ism_offered_cnt = i - 1;
678 if (!ini->ism_dev[0] && !ini->ism_dev[1])
679 ini->smcd_version = 0;
680
681 return rc;
682}
683
41349844
HW		 684/* Check for VLAN ID and register it on ISM device just for CLC handshake */
685static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
bc36d2fc 686 struct smc_init_info *ini)
41349844 687{
3fc64937 688 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
7a62725a 689 return SMC_CLC_DECL_ISMVLANERR;
41349844
HW		 690 return 0;
691}
692
d70bf4f7
UB		 693static int smc_find_proposal_devices(struct smc_sock *smc,
694 struct smc_init_info *ini)
695{
696 int rc = 0;
697
698 /* check if there is an ism device available */
699 if (ini->smcd_version & SMC_V1) {
700 if (smc_find_ism_device(smc, ini) ||
701 smc_connect_ism_vlan_setup(smc, ini)) {
702 if (ini->smc_type_v1 == SMC_TYPE_B)
703 ini->smc_type_v1 = SMC_TYPE_R;
704 else
705 ini->smc_type_v1 = SMC_TYPE_N;
706 } /* else ISM V1 is supported for this connection */
707 if (smc_find_rdma_device(smc, ini)) {
708 if (ini->smc_type_v1 == SMC_TYPE_B)
709 ini->smc_type_v1 = SMC_TYPE_D;
710 else
711 ini->smc_type_v1 = SMC_TYPE_N;
712 } /* else RDMA is supported for this connection */
713 }
49407ae2 714 if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini))
d70bf4f7
UB		 715 ini->smc_type_v2 = SMC_TYPE_N;
716
717 /* if neither ISM nor RDMA are supported, fallback */
718 if (!smcr_indicated(ini->smc_type_v1) &&
719 ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
720 rc = SMC_CLC_DECL_NOSMCDEV;
721
722 return rc;
723}
724
41349844
HW		 725/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
726 * used, the VLAN ID will be registered again during the connection setup.
727 */
d70bf4f7 728static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
bc36d2fc 729 struct smc_init_info *ini)
41349844 730{
d70bf4f7 731 if (!smcd_indicated(ini->smc_type_v1))
41349844 732 return 0;
3fc64937 733 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
41349844
HW		 734 return SMC_CLC_DECL_CNFERR;
735 return 0;
736}
737
a7c9c5f4
UB		 738#define SMC_CLC_MAX_ACCEPT_LEN \
739 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
b81a5eb7 740 sizeof(struct smc_clc_first_contact_ext) + \
a7c9c5f4
UB		 741 sizeof(struct smc_clc_msg_trail))
742
3b2dec26 743/* CLC handshake during connect */
d70bf4f7 744static int smc_connect_clc(struct smc_sock *smc,
a7c9c5f4 745 struct smc_clc_msg_accept_confirm_v2 *aclc2,
bc36d2fc 746 struct smc_init_info *ini)
3b2dec26
HW		 747{
748 int rc = 0;
a046d57d
UB		 749
750 /* do inband token exchange */
d70bf4f7 751 rc = smc_clc_send_proposal(smc, ini);
3b2dec26
HW		 752 if (rc)
753 return rc;
a046d57d 754 /* receive SMC Accept CLC message */
a7c9c5f4
UB		 755 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
756 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
3b2dec26
HW		 757}
758
759/* setup for RDMA connection of client */
760static int smc_connect_rdma(struct smc_sock *smc,
761 struct smc_clc_msg_accept_confirm *aclc,
bc36d2fc 762 struct smc_init_info *ini)
3b2dec26 763{
0fb0b02b 764 int i, reason_code = 0;
3b2dec26 765 struct smc_link *link;
a046d57d 766
bc36d2fc 767 ini->is_smcd = false;
3d9725a6
UB		 768 ini->ib_lcl = &aclc->r0.lcl;
769 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
f1eb02f9 770 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
bc36d2fc 771
72a36a8a 772 mutex_lock(&smc_client_lgr_pending);
7a62725a
KG		 773 reason_code = smc_conn_create(smc, ini);
774 if (reason_code) {
72a36a8a
HW		 775 mutex_unlock(&smc_client_lgr_pending);
776 return reason_code;
0cfdd8f9 777 }
a046d57d 778
3b2dec26 779 smc_conn_save_peer_info(smc, aclc);
cd6851f3 780
5ac54d87 781 if (ini->first_contact_local) {
0fb0b02b
KG		 782 link = smc->conn.lnk;
783 } else {
784 /* set link that was assigned by server */
785 link = NULL;
786 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
787 struct smc_link *l = &smc->conn.lgr->lnk[i];
788
3d9725a6
UB		 789 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
790 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
791 SMC_GID_SIZE) &&
792 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
793 sizeof(l->peer_mac))) {
0fb0b02b
KG		 794 link = l;
795 break;
796 }
797 }
c60a2cef
KG		 798 if (!link) {
799 reason_code = SMC_CLC_DECL_NOSRVLINK;
800 goto connect_abort;
801 }
64513d26 802 smc_switch_link_and_count(&smc->conn, link);
0fb0b02b
KG		 803 }
804
3e034725 805 /* create send buffer and rmb */
c60a2cef
KG		 806 if (smc_buf_create(smc, false)) {
807 reason_code = SMC_CLC_DECL_MEM;
808 goto connect_abort;
809 }
cd6851f3 810
5ac54d87 811 if (ini->first_contact_local)
3b2dec26 812 smc_link_save_peer_info(link, aclc);
bd4ad577 813
c60a2cef
KG		 814 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
815 reason_code = SMC_CLC_DECL_ERR_RTOK;
816 goto connect_abort;
817 }
bd4ad577 818
46c28dbd
UB		 819 smc_close_init(smc);
820 smc_rx_init(smc);
821
5ac54d87 822 if (ini->first_contact_local) {
c60a2cef
KG		 823 if (smc_ib_ready_link(link)) {
824 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
825 goto connect_abort;
826 }
652a1e41 827 } else {
c60a2cef
KG		 828 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
829 reason_code = SMC_CLC_DECL_ERR_REGRMB;
830 goto connect_abort;
831 }
bd4ad577 832 }
10428dd8 833 smc_rmb_sync_sg_for_device(&smc->conn);
a046d57d 834
a7c9c5f4
UB		 835 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
836 SMC_V1);
3b2dec26 837 if (reason_code)
c60a2cef 838 goto connect_abort;
3b2dec26
HW		 839
840 smc_tx_init(smc);
a046d57d 841
5ac54d87 842 if (ini->first_contact_local) {
9bf9abea 843 /* QP confirmation over RoCE fabric */
0fb0b02b 844 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
b9247544 845 reason_code = smcr_clnt_conf_first_link(smc);
0fb0b02b 846 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
3b2dec26 847 if (reason_code)
c60a2cef 848 goto connect_abort;
9bf9abea 849 }
72a36a8a 850 mutex_unlock(&smc_client_lgr_pending);
e6727f39 851
a046d57d 852 smc_copy_sock_settings_to_clc(smc);
50717a37 853 smc->connect_nonblock = 0;
b38d7324
UB		 854 if (smc->sk.sk_state == SMC_INIT)
855 smc->sk.sk_state = SMC_ACTIVE;
a046d57d 856
3b2dec26 857 return 0;
c60a2cef 858connect_abort:
8cf3f3e4 859 smc_conn_abort(smc, ini->first_contact_local);
c60a2cef
KG		 860 mutex_unlock(&smc_client_lgr_pending);
861 smc->connect_nonblock = 0;
862
863 return reason_code;
3b2dec26 864}
a046d57d 865
a7c9c5f4
UB		 866/* The server has chosen one of the proposed ISM devices for the communication.
867 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
868 */
869static int
870smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
871 struct smc_init_info *ini)
872{
873 int i;
874
875 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
876 if (ini->ism_chid[i] == ntohs(aclc->chid)) {
877 ini->ism_selected = i;
878 return 0;
879 }
880 }
881
882 return -EPROTO;
883}
884
41349844
HW		 885/* setup for ISM connection of client */
886static int smc_connect_ism(struct smc_sock *smc,
887 struct smc_clc_msg_accept_confirm *aclc,
bc36d2fc 888 struct smc_init_info *ini)
41349844 889{
41349844
HW		 890 int rc = 0;
891
bc36d2fc 892 ini->is_smcd = true;
f1eb02f9 893 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
bc36d2fc 894
a7c9c5f4
UB		 895 if (aclc->hdr.version == SMC_V2) {
896 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
897 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
898
899 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
900 if (rc)
901 return rc;
902 }
903 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
904
72a36a8a
HW		 905 /* there is only one lgr role for SMC-D; use server lock */
906 mutex_lock(&smc_server_lgr_pending);
7a62725a
KG		 907 rc = smc_conn_create(smc, ini);
908 if (rc) {
72a36a8a 909 mutex_unlock(&smc_server_lgr_pending);
7a62725a 910 return rc;
72a36a8a 911 }
41349844
HW		 912
913 /* Create send and receive buffers */
72b7f6c4 914 rc = smc_buf_create(smc, true);
c60a2cef
KG		 915 if (rc) {
916 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
917 goto connect_abort;
918 }
41349844
HW		 919
920 smc_conn_save_peer_info(smc, aclc);
921 smc_close_init(smc);
922 smc_rx_init(smc);
923 smc_tx_init(smc);
924
a7c9c5f4
UB		 925 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
926 aclc->hdr.version);
41349844 927 if (rc)
c60a2cef 928 goto connect_abort;
72a36a8a 929 mutex_unlock(&smc_server_lgr_pending);
41349844
HW		 930
931 smc_copy_sock_settings_to_clc(smc);
50717a37 932 smc->connect_nonblock = 0;
41349844
HW		 933 if (smc->sk.sk_state == SMC_INIT)
934 smc->sk.sk_state = SMC_ACTIVE;
935
936 return 0;
c60a2cef 937connect_abort:
8cf3f3e4 938 smc_conn_abort(smc, ini->first_contact_local);
c60a2cef
KG		 939 mutex_unlock(&smc_server_lgr_pending);
940 smc->connect_nonblock = 0;
941
942 return rc;
41349844
HW		 943}
944
d70bf4f7
UB		 945/* check if received accept type and version matches a proposed one */
946static int smc_connect_check_aclc(struct smc_init_info *ini,
947 struct smc_clc_msg_accept_confirm *aclc)
948{
949 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
950 !smcr_indicated(ini->smc_type_v1)) ||
951 (aclc->hdr.typev1 == SMC_TYPE_D &&
a7c9c5f4
UB		 952 ((!smcd_indicated(ini->smc_type_v1) &&
953 !smcd_indicated(ini->smc_type_v2)) ||
954 (aclc->hdr.version == SMC_V1 &&
955 !smcd_indicated(ini->smc_type_v1)) ||
956 (aclc->hdr.version == SMC_V2 &&
957 !smcd_indicated(ini->smc_type_v2)))))
d70bf4f7
UB		 958 return SMC_CLC_DECL_MODEUNSUPP;
959
960 return 0;
961}
962
3b2dec26
HW		 963/* perform steps before actually connecting */
964static int __smc_connect(struct smc_sock *smc)
965{
49407ae2 966 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
a7c9c5f4
UB		 967 struct smc_clc_msg_accept_confirm_v2 *aclc2;
968 struct smc_clc_msg_accept_confirm *aclc;
3fc64937 969 struct smc_init_info *ini = NULL;
a7c9c5f4 970 u8 *buf = NULL;
3b2dec26 971 int rc = 0;
a046d57d 972
3b2dec26 973 if (smc->use_fallback)
603cc149 974 return smc_connect_fallback(smc, smc->fallback_rsn);
3b2dec26
HW		 975
976 /* if peer has not signalled SMC-capability, fall back */
977 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
603cc149 978 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
3b2dec26 979
e8d726c8 980 /* IPSec connections opt out of SMC optimizations */
3b2dec26 981 if (using_ipsec(smc))
e8d726c8
UB		 982 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
983 version);
3b2dec26 984
3fc64937
UB		 985 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
986 if (!ini)
e8d726c8
UB		 987 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
988 version);
3fc64937 989
d70bf4f7 990 ini->smcd_version = SMC_V1;
49407ae2 991 ini->smcd_version |= smc_ism_is_v2_capable() ? SMC_V2 : 0;
d70bf4f7 992 ini->smc_type_v1 = SMC_TYPE_B;
49407ae2 993 ini->smc_type_v2 = smc_ism_is_v2_capable() ? SMC_TYPE_D : SMC_TYPE_N;
d70bf4f7 994
fba7e8ef 995 /* get vlan id from IP device */
3fc64937 996 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
d70bf4f7
UB		 997 ini->smcd_version &= ~SMC_V1;
998 ini->smc_type_v1 = SMC_TYPE_N;
999 if (!ini->smcd_version) {
1000 rc = SMC_CLC_DECL_GETVLANERR;
1001 goto fallback;
1002 }
41349844
HW		 1003 }
1004
d70bf4f7
UB		 1005 rc = smc_find_proposal_devices(smc, ini);
1006 if (rc)
1007 goto fallback;
3b2dec26 1008
a7c9c5f4
UB		 1009 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1010 if (!buf) {
1011 rc = SMC_CLC_DECL_MEM;
1012 goto fallback;
1013 }
1014 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1015 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1016
3b2dec26 1017 /* perform CLC handshake */
a7c9c5f4 1018 rc = smc_connect_clc(smc, aclc2, ini);
d70bf4f7
UB		 1019 if (rc)
1020 goto vlan_cleanup;
1021
1022 /* check if smc modes and versions of CLC proposal and accept match */
a7c9c5f4 1023 rc = smc_connect_check_aclc(ini, aclc);
0530bd6e
KG		 1024 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
1025 ini->smcd_version = version;
d70bf4f7
UB		 1026 if (rc)
1027 goto vlan_cleanup;
3b2dec26 1028
41349844 1029 /* depending on previous steps, connect using rdma or ism */
a7c9c5f4
UB		 1030 if (aclc->hdr.typev1 == SMC_TYPE_R)
1031 rc = smc_connect_rdma(smc, aclc, ini);
1032 else if (aclc->hdr.typev1 == SMC_TYPE_D)
1033 rc = smc_connect_ism(smc, aclc, ini);
d70bf4f7
UB		 1034 if (rc)
1035 goto vlan_cleanup;
3b2dec26 1036
194730a9 1037 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
d70bf4f7 1038 smc_connect_ism_vlan_cleanup(smc, ini);
a7c9c5f4 1039 kfree(buf);
3fc64937 1040 kfree(ini);
3b2dec26 1041 return 0;
d70bf4f7
UB		 1042
1043vlan_cleanup:
1044 smc_connect_ism_vlan_cleanup(smc, ini);
a7c9c5f4 1045 kfree(buf);
d70bf4f7
UB		 1046fallback:
1047 kfree(ini);
e8d726c8 1048 return smc_connect_decline_fallback(smc, rc, version);
a046d57d
UB		 1049}
1050
24ac3a08
UB		 1051static void smc_connect_work(struct work_struct *work)
1052{
1053 struct smc_sock *smc = container_of(work, struct smc_sock,
1054 connect_work);
50717a37
UB		 1055 long timeo = smc->sk.sk_sndtimeo;
1056 int rc = 0;
24ac3a08 1057
50717a37
UB		 1058 if (!timeo)
1059 timeo = MAX_SCHEDULE_TIMEOUT;
1060 lock_sock(smc->clcsock->sk);
24ac3a08
UB		 1061 if (smc->clcsock->sk->sk_err) {
1062 smc->sk.sk_err = smc->clcsock->sk->sk_err;
50717a37 1063 } else if ((1 << smc->clcsock->sk->sk_state) &
f3a3a0fe 1064 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
50717a37
UB		 1065 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1066 if ((rc == -EPIPE) &&
1067 ((1 << smc->clcsock->sk->sk_state) &
1068 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1069 rc = 0;
24ac3a08 1070 }
50717a37
UB		 1071 release_sock(smc->clcsock->sk);
1072 lock_sock(&smc->sk);
1073 if (rc != 0 || smc->sk.sk_err) {
1074 smc->sk.sk_state = SMC_CLOSED;
1075 if (rc == -EPIPE || rc == -EAGAIN)
1076 smc->sk.sk_err = EPIPE;
1077 else if (signal_pending(current))
1078 smc->sk.sk_err = -sock_intr_errno(timeo);
6d6dd528 1079 sock_put(&smc->sk); /* passive closing */
24ac3a08
UB		 1080 goto out;
1081 }
1082
1083 rc = __smc_connect(smc);
1084 if (rc < 0)
1085 smc->sk.sk_err = -rc;
1086
1087out:
07603b23
UB		 1088 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1089 if (smc->sk.sk_err) {
1090 smc->sk.sk_state_change(&smc->sk);
1091 } else { /* allow polling before and after fallback decision */
1092 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1093 smc->sk.sk_write_space(&smc->sk);
1094 }
1095 }
24ac3a08
UB		 1096 release_sock(&smc->sk);
1097}
1098
ac713874
UB		 1099static int smc_connect(struct socket *sock, struct sockaddr *addr,
1100 int alen, int flags)
1101{
1102 struct sock *sk = sock->sk;
1103 struct smc_sock *smc;
1104 int rc = -EINVAL;
1105
1106 smc = smc_sk(sk);
1107
1108 /* separate smc parameter checking to be safe */
1109 if (alen < sizeof(addr->sa_family))
1110 goto out_err;
aaa4d33f 1111 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
ac713874
UB		 1112 goto out_err;
1113
1114 lock_sock(sk);
1115 switch (sk->sk_state) {
1116 default:
1117 goto out;
1118 case SMC_ACTIVE:
1119 rc = -EISCONN;
1120 goto out;
1121 case SMC_INIT:
ac713874
UB		 1122 break;
1123 }
1124
1125 smc_copy_sock_settings_to_clc(smc);
c5c1cc9c 1126 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
50717a37
UB		 1127 if (smc->connect_nonblock) {
1128 rc = -EALREADY;
1129 goto out;
1130 }
1131 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1132 if (rc && rc != -EINPROGRESS)
1133 goto out;
301428ea
UB		 1134
1135 sock_hold(&smc->sk); /* sock put in passive closing */
86434744
UB		 1136 if (smc->use_fallback)
1137 goto out;
24ac3a08 1138 if (flags & O_NONBLOCK) {
22ef473d 1139 if (queue_work(smc_hs_wq, &smc->connect_work))
50717a37 1140 smc->connect_nonblock = 1;
24ac3a08
UB		 1141 rc = -EINPROGRESS;
1142 } else {
24ac3a08
UB		 1143 rc = __smc_connect(smc);
1144 if (rc < 0)
1145 goto out;
1146 else
1147 rc = 0; /* success cases including fallback */
1148 }
ac713874
UB		 1149
1150out:
1151 release_sock(sk);
1152out_err:
1153 return rc;
1154}
1155
1156static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1157{
3163c507
UB		 1158 struct socket *new_clcsock = NULL;
1159 struct sock *lsk = &lsmc->sk;
ac713874 1160 struct sock *new_sk;
78abe3d0 1161 int rc = -EINVAL;
ac713874 1162
3163c507 1163 release_sock(lsk);
aaa4d33f 1164 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
ac713874
UB		 1165 if (!new_sk) {
1166 rc = -ENOMEM;
3163c507 1167 lsk->sk_err = ENOMEM;
ac713874 1168 *new_smc = NULL;
3163c507 1169 lock_sock(lsk);
ac713874
UB		 1170 goto out;
1171 }
1172 *new_smc = smc_sk(new_sk);
1173
78abe3d0
MJ		 1174 mutex_lock(&lsmc->clcsock_release_lock);
1175 if (lsmc->clcsock)
a60a2b1e 1176 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
78abe3d0 1177 mutex_unlock(&lsmc->clcsock_release_lock);
3163c507 1178 lock_sock(lsk);
a60a2b1e 1179 if (rc < 0 && rc != -EAGAIN)
3163c507 1180 lsk->sk_err = -rc;
35a6b178 1181 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
f61bca58 1182 new_sk->sk_prot->unhash(new_sk);
a046d57d
UB		 1183 if (new_clcsock)
1184 sock_release(new_clcsock);
1185 new_sk->sk_state = SMC_CLOSED;
1186 sock_set_flag(new_sk, SOCK_DEAD);
51f1de79 1187 sock_put(new_sk); /* final */
ac713874
UB		 1188 *new_smc = NULL;
1189 goto out;
1190 }
1191
a60a2b1e
UB		 1192 /* new clcsock has inherited the smc listen-specific sk_data_ready
1193 * function; switch it back to the original sk_data_ready function
1194 */
1195 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
ac713874
UB		 1196 (*new_smc)->clcsock = new_clcsock;
1197out:
1198 return rc;
1199}
1200
a046d57d
UB		 1201/* add a just created sock to the accept queue of the listen sock as
1202 * candidate for a following socket accept call from user space
1203 */
1204static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1205{
1206 struct smc_sock *par = smc_sk(parent);
1207
51f1de79 1208 sock_hold(sk); /* sock_put in smc_accept_unlink () */
a046d57d
UB		 1209 spin_lock(&par->accept_q_lock);
1210 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1211 spin_unlock(&par->accept_q_lock);
1212 sk_acceptq_added(parent);
1213}
1214
1215/* remove a socket from the accept queue of its parental listening socket */
1216static void smc_accept_unlink(struct sock *sk)
1217{
1218 struct smc_sock *par = smc_sk(sk)->listen_smc;
1219
1220 spin_lock(&par->accept_q_lock);
1221 list_del_init(&smc_sk(sk)->accept_q);
1222 spin_unlock(&par->accept_q_lock);
1223 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
51f1de79 1224 sock_put(sk); /* sock_hold in smc_accept_enqueue */
a046d57d
UB		 1225}
1226
1227/* remove a sock from the accept queue to bind it to a new socket created
1228 * for a socket accept call from user space
1229 */
b38d7324
UB		 1230struct sock *smc_accept_dequeue(struct sock *parent,
1231 struct socket *new_sock)
a046d57d
UB		 1232{
1233 struct smc_sock *isk, *n;
1234 struct sock *new_sk;
1235
1236 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1237 new_sk = (struct sock *)isk;
1238
1239 smc_accept_unlink(new_sk);
1240 if (new_sk->sk_state == SMC_CLOSED) {
f61bca58 1241 new_sk->sk_prot->unhash(new_sk);
127f4970
UB		 1242 if (isk->clcsock) {
1243 sock_release(isk->clcsock);
1244 isk->clcsock = NULL;
1245 }
51f1de79 1246 sock_put(new_sk); /* final */
a046d57d
UB		 1247 continue;
1248 }
07603b23 1249 if (new_sock) {
a046d57d 1250 sock_graft(new_sk, new_sock);
07603b23
UB		 1251 if (isk->use_fallback) {
1252 smc_sk(new_sk)->clcsock->file = new_sock->file;
1253 isk->clcsock->file->private_data = isk->clcsock;
1254 }
1255 }
a046d57d
UB		 1256 return new_sk;
1257 }
1258 return NULL;
1259}
1260
1261/* clean up for a created but never accepted sock */
b38d7324 1262void smc_close_non_accepted(struct sock *sk)
a046d57d
UB		 1263{
1264 struct smc_sock *smc = smc_sk(sk);
1265
81cf4f47 1266 sock_hold(sk); /* sock_put below */
b38d7324
UB		 1267 lock_sock(sk);
1268 if (!sk->sk_lingertime)
1269 /* wait for peer closing */
1270 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
39f41f36 1271 __smc_release(smc);
b38d7324 1272 release_sock(sk);
81cf4f47 1273 sock_put(sk); /* sock_hold above */
51f1de79 1274 sock_put(sk); /* final sock_put */
a046d57d
UB		 1275}
1276
b9247544 1277static int smcr_serv_conf_first_link(struct smc_sock *smc)
9bf9abea 1278{
387707fd 1279 struct smc_link *link = smc->conn.lnk;
4667bb4a 1280 struct smc_llc_qentry *qentry;
9bf9abea
UB		 1281 int rc;
1282
7562a13d 1283 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
603cc149 1284 return SMC_CLC_DECL_ERR_REGRMB;
652a1e41 1285
9bf9abea 1286 /* send CONFIRM LINK request to client over the RoCE fabric */
947541f3 1287 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
9bf9abea 1288 if (rc < 0)
603cc149 1289 return SMC_CLC_DECL_TIMEOUT_CL;
9bf9abea
UB		 1290
1291 /* receive CONFIRM LINK response from client over the RoCE fabric */
4667bb4a
KG		 1292 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1293 SMC_LLC_CONFIRM_LINK);
1294 if (!qentry) {
9bf9abea
UB		 1295 struct smc_clc_msg_decline dclc;
1296
1297 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 1298 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
9ed28556 1299 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
9bf9abea 1300 }
649758ff 1301 smc_llc_save_peer_uid(qentry);
4667bb4a
KG		 1302 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1303 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1304 if (rc)
75d320d6
KG		 1305 return SMC_CLC_DECL_RMBE_EC;
1306
4667bb4a
KG		 1307 /* confirm_rkey is implicit on 1st contact */
1308 smc->conn.rmb_desc->is_conf_rkey = true;
52bedf37 1309
00a049cf 1310 smc_llc_link_active(link);
0a99be43 1311 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
52bedf37 1312
4667bb4a 1313 /* initial contact - try to establish second link */
2d2209f2 1314 smc_llc_srv_add_link(link);
75d320d6 1315 return 0;
9bf9abea
UB		 1316}
1317
3b2dec26
HW		 1318/* listen worker: finish */
1319static void smc_listen_out(struct smc_sock *new_smc)
a046d57d 1320{
a046d57d 1321 struct smc_sock *lsmc = new_smc->listen_smc;
a046d57d 1322 struct sock *newsmcsk = &new_smc->sk;
a046d57d 1323
3b2dec26 1324 if (lsmc->sk.sk_state == SMC_LISTEN) {
fd57770d 1325 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
3b2dec26 1326 smc_accept_enqueue(&lsmc->sk, newsmcsk);
fd57770d 1327 release_sock(&lsmc->sk);
3b2dec26
HW		 1328 } else { /* no longer listening */
1329 smc_close_non_accepted(newsmcsk);
c5c1cc9c
UB		 1330 }
1331
3b2dec26
HW		 1332 /* Wake up accept */
1333 lsmc->sk.sk_data_ready(&lsmc->sk);
1334 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1335}
a046d57d 1336
3b2dec26
HW		 1337/* listen worker: finish in state connected */
1338static void smc_listen_out_connected(struct smc_sock *new_smc)
1339{
1340 struct sock *newsmcsk = &new_smc->sk;
a046d57d 1341
3b2dec26
HW		 1342 sk_refcnt_debug_inc(newsmcsk);
1343 if (newsmcsk->sk_state == SMC_INIT)
1344 newsmcsk->sk_state = SMC_ACTIVE;
1345
1346 smc_listen_out(new_smc);
1347}
1348
1349/* listen worker: finish in error state */
1350static void smc_listen_out_err(struct smc_sock *new_smc)
1351{
1352 struct sock *newsmcsk = &new_smc->sk;
194730a9 1353 struct net *net = sock_net(newsmcsk);
3b2dec26 1354
194730a9 1355 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
3b2dec26
HW		 1356 if (newsmcsk->sk_state == SMC_INIT)
1357 sock_put(&new_smc->sk); /* passive closing */
1358 newsmcsk->sk_state = SMC_CLOSED;
3b2dec26
HW		 1359
1360 smc_listen_out(new_smc);
1361}
1362
1363/* listen worker: decline and fall back if possible */
1364static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
4a9baf45 1365 int local_first, u8 version)
3b2dec26
HW		 1366{
1367 /* RDMA setup failed, switch back to TCP */
8cf3f3e4 1368 smc_conn_abort(new_smc, local_first);
3b2dec26
HW		 1369 if (reason_code < 0) { /* error, no fallback possible */
1370 smc_listen_out_err(new_smc);
1371 return;
1372 }
e0e4b8fa 1373 smc_switch_to_fallback(new_smc, reason_code);
603cc149 1374 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
e8d726c8 1375 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
3b2dec26
HW		 1376 smc_listen_out_err(new_smc);
1377 return;
1378 }
a046d57d 1379 }
3b2dec26
HW		 1380 smc_listen_out_connected(new_smc);
1381}
1382
5c21c4cc
UB		 1383/* listen worker: version checking */
1384static int smc_listen_v2_check(struct smc_sock *new_smc,
1385 struct smc_clc_msg_proposal *pclc,
1386 struct smc_init_info *ini)
1387{
1388 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1389 struct smc_clc_v2_extension *pclc_v2_ext;
3752404a 1390 int rc = SMC_CLC_DECL_PEERNOSMC;
5c21c4cc
UB		 1391
1392 ini->smc_type_v1 = pclc->hdr.typev1;
1393 ini->smc_type_v2 = pclc->hdr.typev2;
1394 ini->smcd_version = ini->smc_type_v1 != SMC_TYPE_N ? SMC_V1 : 0;
1395 if (pclc->hdr.version > SMC_V1)
1396 ini->smcd_version |=
1397 ini->smc_type_v2 != SMC_TYPE_N ? SMC_V2 : 0;
3752404a
KG		 1398 if (!(ini->smcd_version & SMC_V2)) {
1399 rc = SMC_CLC_DECL_PEERNOSMC;
1400 goto out;
1401 }
49407ae2 1402 if (!smc_ism_is_v2_capable()) {
5c21c4cc 1403 ini->smcd_version &= ~SMC_V2;
3752404a 1404 rc = SMC_CLC_DECL_NOISM2SUPP;
5c21c4cc
UB		 1405 goto out;
1406 }
1407 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1408 if (!pclc_v2_ext) {
1409 ini->smcd_version &= ~SMC_V2;
3752404a 1410 rc = SMC_CLC_DECL_NOV2EXT;
5c21c4cc
UB		 1411 goto out;
1412 }
1413 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
3752404a 1414 if (!pclc_smcd_v2_ext) {
5c21c4cc 1415 ini->smcd_version &= ~SMC_V2;
3752404a
KG		 1416 rc = SMC_CLC_DECL_NOV2DEXT;
1417 }
5c21c4cc
UB		 1418
1419out:
3752404a
KG		 1420 if (!ini->smcd_version)
1421 return rc;
5c21c4cc
UB		 1422
1423 return 0;
1424}
1425
3b2dec26 1426/* listen worker: check prefixes */
59886697 1427static int smc_listen_prfx_check(struct smc_sock *new_smc,
3b2dec26
HW		 1428 struct smc_clc_msg_proposal *pclc)
1429{
1430 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1431 struct socket *newclcsock = new_smc->clcsock;
a046d57d 1432
5c21c4cc
UB		 1433 if (pclc->hdr.typev1 == SMC_TYPE_N)
1434 return 0;
e7b7a64a 1435 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
3b2dec26 1436 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
59886697 1437 return SMC_CLC_DECL_DIFFPREFIX;
c246d942 1438
3b2dec26
HW		 1439 return 0;
1440}
a046d57d 1441
3b2dec26
HW		 1442/* listen worker: initialize connection and buffers */
1443static int smc_listen_rdma_init(struct smc_sock *new_smc,
7a62725a 1444 struct smc_init_info *ini)
3b2dec26 1445{
7a62725a
KG		 1446 int rc;
1447
0cfdd8f9 1448 /* allocate connection / link group */
7a62725a
KG		 1449 rc = smc_conn_create(new_smc, ini);
1450 if (rc)
1451 return rc;
a046d57d 1452
3e034725 1453 /* create send buffer and rmb */
c6ba7c9b 1454 if (smc_buf_create(new_smc, false))
3b2dec26 1455 return SMC_CLC_DECL_MEM;
a046d57d 1456
3b2dec26
HW		 1457 return 0;
1458}
1459
41349844
HW		 1460/* listen worker: initialize connection and buffers for SMC-D */
1461static int smc_listen_ism_init(struct smc_sock *new_smc,
7a62725a 1462 struct smc_init_info *ini)
41349844 1463{
7a62725a 1464 int rc;
41349844 1465
7a62725a
KG		 1466 rc = smc_conn_create(new_smc, ini);
1467 if (rc)
1468 return rc;
41349844 1469
41349844 1470 /* Create send and receive buffers */
72b7f6c4
KG		 1471 rc = smc_buf_create(new_smc, true);
1472 if (rc) {
8cf3f3e4 1473 smc_conn_abort(new_smc, ini->first_contact_local);
72b7f6c4
KG		 1474 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1475 SMC_CLC_DECL_MEM;
41349844
HW		 1476 }
1477
1478 return 0;
1479}
1480
5c21c4cc
UB		 1481static bool smc_is_already_selected(struct smcd_dev *smcd,
1482 struct smc_init_info *ini,
1483 int matches)
1484{
1485 int i;
1486
1487 for (i = 0; i < matches; i++)
1488 if (smcd == ini->ism_dev[i])
1489 return true;
1490
1491 return false;
1492}
1493
1494/* check for ISM devices matching proposed ISM devices */
1495static void smc_check_ism_v2_match(struct smc_init_info *ini,
1496 u16 proposed_chid, u64 proposed_gid,
1497 unsigned int *matches)
1498{
1499 struct smcd_dev *smcd;
1500
1501 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1502 if (smcd->going_away)
1503 continue;
1504 if (smc_is_already_selected(smcd, ini, *matches))
1505 continue;
1506 if (smc_ism_get_chid(smcd) == proposed_chid &&
1507 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1508 ini->ism_peer_gid[*matches] = proposed_gid;
1509 ini->ism_dev[*matches] = smcd;
1510 (*matches)++;
1511 break;
1512 }
1513 }
1514}
1515
3752404a
KG		 1516static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
1517{
1518 if (!ini->rc)
1519 ini->rc = rc;
1520}
1521
5c21c4cc
UB		 1522static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
1523 struct smc_clc_msg_proposal *pclc,
1524 struct smc_init_info *ini)
1525{
1526 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
1527 struct smc_clc_v2_extension *smc_v2_ext;
1528 struct smc_clc_msg_smcd *pclc_smcd;
1529 unsigned int matches = 0;
f29fa003 1530 u8 smcd_version;
5c21c4cc 1531 u8 *eid = NULL;
3752404a 1532 int i, rc;
5c21c4cc
UB		 1533
1534 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
f29fa003 1535 goto not_found;
5c21c4cc
UB		 1536
1537 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1538 smc_v2_ext = smc_get_clc_v2_ext(pclc);
1539 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
1540 if (!smcd_v2_ext ||
3752404a
KG		 1541 !smc_v2_ext->hdr.flag.seid) { /* no system EID support for SMCD */
1542 smc_find_ism_store_rc(SMC_CLC_DECL_NOSEID, ini);
5c21c4cc 1543 goto not_found;
3752404a 1544 }
5c21c4cc
UB		 1545
1546 mutex_lock(&smcd_dev_list.mutex);
1547 if (pclc_smcd->ism.chid)
1548 /* check for ISM device matching proposed native ISM device */
1549 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
1550 ntohll(pclc_smcd->ism.gid), &matches);
1551 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
1552 /* check for ISM devices matching proposed non-native ISM
1553 * devices
1554 */
1555 smc_check_ism_v2_match(ini,
1556 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
1557 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
1558 &matches);
1559 }
1560 mutex_unlock(&smcd_dev_list.mutex);
1561
1562 if (ini->ism_dev[0]) {
1563 smc_ism_get_system_eid(ini->ism_dev[0], &eid);
1564 if (memcmp(eid, smcd_v2_ext->system_eid, SMC_MAX_EID_LEN))
1565 goto not_found;
1566 } else {
1567 goto not_found;
1568 }
1569
1570 /* separate - outside the smcd_dev_list.lock */
f29fa003 1571 smcd_version = ini->smcd_version;
5c21c4cc
UB		 1572 for (i = 0; i < matches; i++) {
1573 ini->smcd_version = SMC_V2;
1574 ini->is_smcd = true;
1575 ini->ism_selected = i;
3752404a
KG		 1576 rc = smc_listen_ism_init(new_smc, ini);
1577 if (rc) {
1578 smc_find_ism_store_rc(rc, ini);
5c21c4cc
UB		 1579 /* try next active ISM device */
1580 continue;
3752404a 1581 }
5c21c4cc
UB		 1582 return; /* matching and usable V2 ISM device found */
1583 }
f29fa003
KG		 1584 /* no V2 ISM device could be initialized */
1585 ini->smcd_version = smcd_version; /* restore original value */
5c21c4cc
UB		 1586
1587not_found:
1588 ini->smcd_version &= ~SMC_V2;
1589 ini->ism_dev[0] = NULL;
1590 ini->is_smcd = false;
1591}
1592
1593static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
1594 struct smc_clc_msg_proposal *pclc,
1595 struct smc_init_info *ini)
7affc809
UB		 1596{
1597 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
3752404a 1598 int rc = 0;
7affc809 1599
5c21c4cc
UB		 1600 /* check if ISM V1 is available */
1601 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
7affc809
UB		 1602 goto not_found;
1603 ini->is_smcd = true; /* prepare ISM check */
8c3dca34 1604 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
3752404a
KG		 1605 rc = smc_find_ism_device(new_smc, ini);
1606 if (rc)
7affc809 1607 goto not_found;
5c21c4cc 1608 ini->ism_selected = 0;
3752404a
KG		 1609 rc = smc_listen_ism_init(new_smc, ini);
1610 if (!rc)
5c21c4cc 1611 return; /* V1 ISM device found */
7affc809
UB		 1612
1613not_found:
3752404a 1614 smc_find_ism_store_rc(rc, ini);
3fc64937 1615 ini->ism_dev[0] = NULL;
7affc809
UB		 1616 ini->is_smcd = false;
1617}
1618
3b2dec26 1619/* listen worker: register buffers */
5ac54d87 1620static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
3b2dec26 1621{
b9247544 1622 struct smc_connection *conn = &new_smc->conn;
46c28dbd 1623
5ac54d87 1624 if (!local_first) {
7562a13d 1625 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
c7674c00 1626 return SMC_CLC_DECL_ERR_REGRMB;
652a1e41 1627 }
10428dd8 1628 smc_rmb_sync_sg_for_device(&new_smc->conn);
652a1e41 1629
3b2dec26
HW		 1630 return 0;
1631}
1632
5c21c4cc
UB		 1633static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
1634 struct smc_clc_msg_proposal *pclc,
1635 struct smc_init_info *ini)
7affc809
UB		 1636{
1637 int rc;
1638
5c21c4cc 1639 if (!smcr_indicated(ini->smc_type_v1))
7affc809
UB		 1640 return SMC_CLC_DECL_NOSMCDEV;
1641
1642 /* prepare RDMA check */
1643 ini->ib_lcl = &pclc->lcl;
1644 rc = smc_find_rdma_device(new_smc, ini);
1645 if (rc) {
1646 /* no RDMA device found */
5c21c4cc 1647 if (ini->smc_type_v1 == SMC_TYPE_B)
7affc809
UB		 1648 /* neither ISM nor RDMA device found */
1649 rc = SMC_CLC_DECL_NOSMCDEV;
1650 return rc;
1651 }
1652 rc = smc_listen_rdma_init(new_smc, ini);
1653 if (rc)
1654 return rc;
1655 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1656}
1657
1658/* determine the local device matching to proposal */
1659static int smc_listen_find_device(struct smc_sock *new_smc,
1660 struct smc_clc_msg_proposal *pclc,
1661 struct smc_init_info *ini)
1662{
5c21c4cc
UB		 1663 int rc;
1664
1665 /* check for ISM device matching V2 proposed device */
1666 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
1667 if (ini->ism_dev[0])
7affc809 1668 return 0;
5c21c4cc
UB		 1669
1670 if (!(ini->smcd_version & SMC_V1))
3752404a 1671 return ini->rc ?: SMC_CLC_DECL_NOSMCD2DEV;
5c21c4cc
UB		 1672
1673 /* check for matching IP prefix and subnet length */
1674 rc = smc_listen_prfx_check(new_smc, pclc);
1675 if (rc)
3752404a 1676 return ini->rc ?: rc;
5c21c4cc
UB		 1677
1678 /* get vlan id from IP device */
1679 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
3752404a 1680 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
5c21c4cc
UB		 1681
1682 /* check for ISM device matching V1 proposed device */
1683 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
1684 if (ini->ism_dev[0])
1685 return 0;
1686
7affc809 1687 if (pclc->hdr.typev1 == SMC_TYPE_D)
3752404a
KG		 1688 /* skip RDMA and decline */
1689 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
7affc809
UB		 1690
1691 /* check if RDMA is available */
3752404a
KG		 1692 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
1693 smc_find_ism_store_rc(rc, ini);
1694
1695 return (!rc) ? 0 : ini->rc;
7affc809
UB		 1696}
1697
3b2dec26 1698/* listen worker: finish RDMA setup */
1ca52fcf
UB		 1699static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1700 struct smc_clc_msg_accept_confirm *cclc,
5ac54d87 1701 bool local_first)
3b2dec26 1702{
387707fd 1703 struct smc_link *link = new_smc->conn.lnk;
3b2dec26 1704 int reason_code = 0;
a046d57d 1705
5ac54d87 1706 if (local_first)
3b2dec26 1707 smc_link_save_peer_info(link, cclc);
a046d57d 1708
0c881ada
UB		 1709 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
1710 return SMC_CLC_DECL_ERR_RTOK;
bd4ad577 1711
5ac54d87 1712 if (local_first) {
0c881ada
UB		 1713 if (smc_ib_ready_link(link))
1714 return SMC_CLC_DECL_ERR_RDYLNK;
9bf9abea 1715 /* QP confirmation over RoCE fabric */
4667bb4a 1716 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
b9247544 1717 reason_code = smcr_serv_conf_first_link(new_smc);
4667bb4a 1718 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
bd4ad577 1719 }
1ca52fcf 1720 return reason_code;
3b2dec26 1721}
e6727f39 1722
7affc809 1723/* setup for connection of server */
3b2dec26
HW		 1724static void smc_listen_work(struct work_struct *work)
1725{
1726 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1727 smc_listen_work);
49407ae2 1728 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
3b2dec26 1729 struct socket *newclcsock = new_smc->clcsock;
a7c9c5f4 1730 struct smc_clc_msg_accept_confirm *cclc;
6bb14e48 1731 struct smc_clc_msg_proposal_area *buf;
3b2dec26 1732 struct smc_clc_msg_proposal *pclc;
3fc64937 1733 struct smc_init_info *ini = NULL;
3b2dec26 1734 int rc = 0;
3b2dec26 1735
fd57770d
KG		 1736 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1737 return smc_listen_out_err(new_smc);
1738
3b2dec26
HW		 1739 if (new_smc->use_fallback) {
1740 smc_listen_out_connected(new_smc);
1741 return;
a046d57d 1742 }
a046d57d 1743
3b2dec26
HW		 1744 /* check if peer is smc capable */
1745 if (!tcp_sk(newclcsock->sk)->syn_smc) {
e0e4b8fa 1746 smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
3b2dec26
HW		 1747 smc_listen_out_connected(new_smc);
1748 return;
1749 }
a046d57d 1750
3b2dec26
HW		 1751 /* do inband token exchange -
1752 * wait for and receive SMC Proposal CLC message
1753 */
6bb14e48
UB		 1754 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1755 if (!buf) {
1756 rc = SMC_CLC_DECL_MEM;
1757 goto out_decl;
1758 }
1759 pclc = (struct smc_clc_msg_proposal *)buf;
1760 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
228bae05 1761 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
9aa68d29
KG		 1762 if (rc)
1763 goto out_decl;
e8d726c8 1764 version = pclc->hdr.version == SMC_V1 ? SMC_V1 : version;
a046d57d 1765
e8d726c8 1766 /* IPSec connections opt out of SMC optimizations */
3b2dec26 1767 if (using_ipsec(new_smc)) {
9aa68d29
KG		 1768 rc = SMC_CLC_DECL_IPSEC;
1769 goto out_decl;
3b2dec26
HW		 1770 }
1771
3fc64937
UB		 1772 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1773 if (!ini) {
1774 rc = SMC_CLC_DECL_MEM;
1775 goto out_decl;
1776 }
1777
5c21c4cc
UB		 1778 /* initial version checking */
1779 rc = smc_listen_v2_check(new_smc, pclc, ini);
1780 if (rc)
9aa68d29 1781 goto out_decl;
fba7e8ef 1782
72a36a8a 1783 mutex_lock(&smc_server_lgr_pending);
3b2dec26
HW		 1784 smc_close_init(new_smc);
1785 smc_rx_init(new_smc);
1786 smc_tx_init(new_smc);
1787
7affc809 1788 /* determine ISM or RoCE device used for connection */
3fc64937 1789 rc = smc_listen_find_device(new_smc, pclc, ini);
7affc809
UB		 1790 if (rc)
1791 goto out_unlock;
3b2dec26
HW		 1792
1793 /* send SMC Accept CLC message */
a7c9c5f4
UB		 1794 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
1795 ini->smcd_version == SMC_V2 ? SMC_V2 : SMC_V1);
9aa68d29
KG		 1796 if (rc)
1797 goto out_unlock;
3b2dec26 1798
62c7139f 1799 /* SMC-D does not need this lock any more */
3fc64937 1800 if (ini->is_smcd)
72a36a8a 1801 mutex_unlock(&smc_server_lgr_pending);
62c7139f 1802
3b2dec26 1803 /* receive SMC Confirm CLC message */
9047a617
KG		 1804 memset(buf, 0, sizeof(*buf));
1805 cclc = (struct smc_clc_msg_accept_confirm *)buf;
1806 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
228bae05
KG		 1807 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
1808 if (rc) {
3fc64937 1809 if (!ini->is_smcd)
9aa68d29
KG		 1810 goto out_unlock;
1811 goto out_decl;
3b2dec26
HW		 1812 }
1813
1814 /* finish worker */
3fc64937 1815 if (!ini->is_smcd) {
a7c9c5f4 1816 rc = smc_listen_rdma_finish(new_smc, cclc,
3fc64937 1817 ini->first_contact_local);
62c7139f 1818 if (rc)
0c881ada
UB		 1819 goto out_unlock;
1820 mutex_unlock(&smc_server_lgr_pending);
1ca52fcf 1821 }
a7c9c5f4 1822 smc_conn_save_peer_info(new_smc, cclc);
3b2dec26 1823 smc_listen_out_connected(new_smc);
194730a9 1824 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
ac679364 1825 goto out_free;
9aa68d29
KG		 1826
1827out_unlock:
1828 mutex_unlock(&smc_server_lgr_pending);
1829out_decl:
4a9baf45
KG		 1830 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
1831 version);
ac679364 1832out_free:
3fc64937 1833 kfree(ini);
6bb14e48 1834 kfree(buf);
a046d57d
UB		 1835}
1836
1837static void smc_tcp_listen_work(struct work_struct *work)
1838{
1839 struct smc_sock *lsmc = container_of(work, struct smc_sock,
1840 tcp_listen_work);
3163c507 1841 struct sock *lsk = &lsmc->sk;
a046d57d
UB		 1842 struct smc_sock *new_smc;
1843 int rc = 0;
1844
3163c507
UB		 1845 lock_sock(lsk);
1846 while (lsk->sk_state == SMC_LISTEN) {
a046d57d 1847 rc = smc_clcsock_accept(lsmc, &new_smc);
a60a2b1e 1848 if (rc) /* clcsock accept queue empty or error */
a046d57d
UB		 1849 goto out;
1850 if (!new_smc)
1851 continue;
1852
1853 new_smc->listen_smc = lsmc;
ee9dfbef 1854 new_smc->use_fallback = lsmc->use_fallback;
603cc149 1855 new_smc->fallback_rsn = lsmc->fallback_rsn;
3163c507 1856 sock_hold(lsk); /* sock_put in smc_listen_work */
a046d57d
UB		 1857 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
1858 smc_copy_sock_settings_to_smc(new_smc);
bd58c7e0
UB		 1859 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
1860 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
51f1de79 1861 sock_hold(&new_smc->sk); /* sock_put in passive closing */
22ef473d 1862 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
51f1de79 1863 sock_put(&new_smc->sk);
a046d57d
UB		 1864 }
1865
1866out:
3163c507 1867 release_sock(lsk);
a60a2b1e
UB		 1868 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
1869}
1870
1871static void smc_clcsock_data_ready(struct sock *listen_clcsock)
1872{
1873 struct smc_sock *lsmc;
1874
1875 lsmc = (struct smc_sock *)
1876 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY);
1877 if (!lsmc)
1878 return;
1879 lsmc->clcsk_data_ready(listen_clcsock);
1880 if (lsmc->sk.sk_state == SMC_LISTEN) {
1881 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
22ef473d 1882 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work))
a60a2b1e
UB		 1883 sock_put(&lsmc->sk);
1884 }
a046d57d
UB		 1885}
1886
ac713874
UB		 1887static int smc_listen(struct socket *sock, int backlog)
1888{
1889 struct sock *sk = sock->sk;
1890 struct smc_sock *smc;
1891 int rc;
1892
1893 smc = smc_sk(sk);
1894 lock_sock(sk);
1895
1896 rc = -EINVAL;
cd206360
UB		 1897 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
1898 smc->connect_nonblock)
ac713874
UB		 1899 goto out;
1900
1901 rc = 0;
1902 if (sk->sk_state == SMC_LISTEN) {
1903 sk->sk_max_ack_backlog = backlog;
1904 goto out;
1905 }
1906 /* some socket options are handled in core, so we could not apply
1907 * them to the clc socket -- copy smc socket options to clc socket
1908 */
1909 smc_copy_sock_settings_to_clc(smc);
ee9dfbef
UB		 1910 if (!smc->use_fallback)
1911 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
ac713874 1912
a60a2b1e
UB		 1913 /* save original sk_data_ready function and establish
1914 * smc-specific sk_data_ready function
1915 */
1916 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready;
1917 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready;
1918 smc->clcsock->sk->sk_user_data =
1919 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
ac713874 1920 rc = kernel_listen(smc->clcsock, backlog);
6ce3642c
GD		 1921 if (rc) {
1922 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
ac713874 1923 goto out;
6ce3642c 1924 }
ac713874
UB		 1925 sk->sk_max_ack_backlog = backlog;
1926 sk->sk_ack_backlog = 0;
1927 sk->sk_state = SMC_LISTEN;
1928
1929out:
1930 release_sock(sk);
1931 return rc;
1932}
1933
1934static int smc_accept(struct socket *sock, struct socket *new_sock,
cdfbabfb 1935 int flags, bool kern)
ac713874 1936{
a046d57d
UB		 1937 struct sock *sk = sock->sk, *nsk;
1938 DECLARE_WAITQUEUE(wait, current);
ac713874 1939 struct smc_sock *lsmc;
a046d57d
UB		 1940 long timeo;
1941 int rc = 0;
ac713874
UB		 1942
1943 lsmc = smc_sk(sk);
51f1de79 1944 sock_hold(sk); /* sock_put below */
ac713874
UB		 1945 lock_sock(sk);
1946
1947 if (lsmc->sk.sk_state != SMC_LISTEN) {
1948 rc = -EINVAL;
abb190f1 1949 release_sock(sk);
ac713874
UB		 1950 goto out;
1951 }
1952
a046d57d
UB		 1953 /* Wait for an incoming connection */
1954 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1955 add_wait_queue_exclusive(sk_sleep(sk), &wait);
1956 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
1957 set_current_state(TASK_INTERRUPTIBLE);
1958 if (!timeo) {
1959 rc = -EAGAIN;
1960 break;
1961 }
1962 release_sock(sk);
1963 timeo = schedule_timeout(timeo);
1964 /* wakeup by sk_data_ready in smc_listen_work() */
1965 sched_annotate_sleep();
1966 lock_sock(sk);
1967 if (signal_pending(current)) {
1968 rc = sock_intr_errno(timeo);
1969 break;
1970 }
1971 }
1972 set_current_state(TASK_RUNNING);
1973 remove_wait_queue(sk_sleep(sk), &wait);
ac713874 1974
a046d57d
UB		 1975 if (!rc)
1976 rc = sock_error(nsk);
abb190f1
UB		 1977 release_sock(sk);
1978 if (rc)
1979 goto out;
1980
1981 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
1982 /* wait till data arrives on the socket */
1983 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
1984 MSEC_PER_SEC);
1985 if (smc_sk(nsk)->use_fallback) {
1986 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
1987
1988 lock_sock(clcsk);
1989 if (skb_queue_empty(&clcsk->sk_receive_queue))
1990 sk_wait_data(clcsk, &timeo, NULL);
1991 release_sock(clcsk);
1992 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
1993 lock_sock(nsk);
b51fa1b1 1994 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
abb190f1
UB		 1995 release_sock(nsk);
1996 }
1997 }
ac713874
UB		 1998
1999out:
51f1de79 2000 sock_put(sk); /* sock_hold above */
ac713874
UB		 2001 return rc;
2002}
2003
2004static int smc_getname(struct socket *sock, struct sockaddr *addr,
9b2c45d4 2005 int peer)
ac713874
UB		 2006{
2007 struct smc_sock *smc;
2008
b38d7324
UB		 2009 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2010 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
ac713874
UB		 2011 return -ENOTCONN;
2012
2013 smc = smc_sk(sock->sk);
2014
9b2c45d4 2015 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
ac713874
UB		 2016}
2017
2018static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2019{
2020 struct sock *sk = sock->sk;
2021 struct smc_sock *smc;
2022 int rc = -EPIPE;
2023
2024 smc = smc_sk(sk);
2025 lock_sock(sk);
b38d7324
UB		 2026 if ((sk->sk_state != SMC_ACTIVE) &&
2027 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2028 (sk->sk_state != SMC_INIT))
ac713874 2029 goto out;
ee9dfbef
UB		 2030
2031 if (msg->msg_flags & MSG_FASTOPEN) {
cd206360 2032 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
e0e4b8fa 2033 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
ee9dfbef
UB		 2034 } else {
2035 rc = -EINVAL;
2036 goto out;
2037 }
2038 }
2039
e0e4b8fa 2040 if (smc->use_fallback) {
ac713874 2041 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
e0e4b8fa 2042 } else {
e6727f39 2043 rc = smc_tx_sendmsg(smc, msg, len);
e0e4b8fa
GG		 2044 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2045 }
ac713874
UB		 2046out:
2047 release_sock(sk);
2048 return rc;
2049}
2050
2051static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2052 int flags)
2053{
2054 struct sock *sk = sock->sk;
2055 struct smc_sock *smc;
2056 int rc = -ENOTCONN;
2057
2058 smc = smc_sk(sk);
2059 lock_sock(sk);
51c5aba3
KG		 2060 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2061 /* socket was connected before, no more data to read */
2062 rc = 0;
2063 goto out;
2064 }
b38d7324
UB		 2065 if ((sk->sk_state == SMC_INIT) ||
2066 (sk->sk_state == SMC_LISTEN) ||
2067 (sk->sk_state == SMC_CLOSED))
ac713874
UB		 2068 goto out;
2069
b38d7324
UB		 2070 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2071 rc = 0;
2072 goto out;
2073 }
2074
9014db20 2075 if (smc->use_fallback) {
ac713874 2076 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
9014db20
SR		 2077 } else {
2078 msg->msg_namelen = 0;
2079 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
e0e4b8fa 2080 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
9014db20 2081 }
b38d7324 2082
ac713874
UB		 2083out:
2084 release_sock(sk);
2085 return rc;
2086}
2087
ade994f4 2088static __poll_t smc_accept_poll(struct sock *parent)
a046d57d 2089{
8dce2786 2090 struct smc_sock *isk = smc_sk(parent);
63e2480c 2091 __poll_t mask = 0;
a046d57d 2092
8dce2786
UB		 2093 spin_lock(&isk->accept_q_lock);
2094 if (!list_empty(&isk->accept_q))
a9a08845 2095 mask = EPOLLIN | EPOLLRDNORM;
8dce2786 2096 spin_unlock(&isk->accept_q_lock);
a046d57d 2097
8dce2786 2098 return mask;
a046d57d
UB		 2099}
2100
a11e1d43
LT		 2101static __poll_t smc_poll(struct file *file, struct socket *sock,
2102 poll_table *wait)
ac713874
UB		 2103{
2104 struct sock *sk = sock->sk;
ac713874 2105 struct smc_sock *smc;
50717a37 2106 __poll_t mask = 0;
ac713874 2107
8dce2786 2108 if (!sk)
a9a08845 2109 return EPOLLNVAL;
8dce2786 2110
ac713874 2111 smc = smc_sk(sock->sk);
648a5a7a 2112 if (smc->use_fallback) {
a046d57d 2113 /* delegate to CLC child sock */
a11e1d43 2114 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
784813ae 2115 sk->sk_err = smc->clcsock->sk->sk_err;
ac713874 2116 } else {
410da1e1 2117 if (sk->sk_state != SMC_CLOSED)
89ab066d 2118 sock_poll_wait(file, sock, wait);
a046d57d 2119 if (sk->sk_err)
a9a08845 2120 mask |= EPOLLERR;
b38d7324
UB		 2121 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2122 (sk->sk_state == SMC_CLOSED))
a9a08845 2123 mask |= EPOLLHUP;
8dce2786
UB		 2124 if (sk->sk_state == SMC_LISTEN) {
2125 /* woken up by sk_data_ready in smc_listen_work() */
50717a37
UB		 2126 mask |= smc_accept_poll(sk);
2127 } else if (smc->use_fallback) { /* as result of connect_work()*/
2128 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2129 wait);
2130 sk->sk_err = smc->clcsock->sk->sk_err;
8dce2786 2131 } else {
50717a37
UB		 2132 if ((sk->sk_state != SMC_INIT &&
2133 atomic_read(&smc->conn.sndbuf_space)) ||
8dce2786 2134 sk->sk_shutdown & SEND_SHUTDOWN) {
a9a08845 2135 mask |= EPOLLOUT | EPOLLWRNORM;
8dce2786
UB		 2136 } else {
2137 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2138 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2139 }
2140 if (atomic_read(&smc->conn.bytes_to_rcv))
a9a08845 2141 mask |= EPOLLIN | EPOLLRDNORM;
8dce2786 2142 if (sk->sk_shutdown & RCV_SHUTDOWN)
a9a08845 2143 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
8dce2786 2144 if (sk->sk_state == SMC_APPCLOSEWAIT1)
a9a08845 2145 mask |= EPOLLIN;
71d117f5
KG		 2146 if (smc->conn.urg_state == SMC_URG_VALID)
2147 mask |= EPOLLPRI;
8dce2786 2148 }
ac713874
UB		 2149 }
2150
2151 return mask;
2152}
2153
2154static int smc_shutdown(struct socket *sock, int how)
2155{
2156 struct sock *sk = sock->sk;
76aa7d8c 2157 bool do_shutdown = true;
ac713874
UB		 2158 struct smc_sock *smc;
2159 int rc = -EINVAL;
76aa7d8c 2160 int old_state;
b38d7324 2161 int rc1 = 0;
ac713874
UB		 2162
2163 smc = smc_sk(sk);
2164
2165 if ((how < SHUT_RD) || (how > SHUT_RDWR))
b38d7324 2166 return rc;
ac713874
UB		 2167
2168 lock_sock(sk);
2169
2170 rc = -ENOTCONN;
caa21e19 2171 if ((sk->sk_state != SMC_ACTIVE) &&
b38d7324
UB		 2172 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2173 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2174 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2175 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2176 (sk->sk_state != SMC_APPFINCLOSEWAIT))
ac713874
UB		 2177 goto out;
2178 if (smc->use_fallback) {
2179 rc = kernel_sock_shutdown(smc->clcsock, how);
2180 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2181 if (sk->sk_shutdown == SHUTDOWN_MASK)
2182 sk->sk_state = SMC_CLOSED;
b38d7324 2183 goto out;
ac713874 2184 }
b38d7324
UB		 2185 switch (how) {
2186 case SHUT_RDWR: /* shutdown in both directions */
76aa7d8c 2187 old_state = sk->sk_state;
b38d7324 2188 rc = smc_close_active(smc);
76aa7d8c
TL		 2189 if (old_state == SMC_ACTIVE &&
2190 sk->sk_state == SMC_PEERCLOSEWAIT1)
2191 do_shutdown = false;
b38d7324
UB		 2192 break;
2193 case SHUT_WR:
2194 rc = smc_close_shutdown_write(smc);
2195 break;
2196 case SHUT_RD:
1255fcb2
UB		 2197 rc = 0;
2198 /* nothing more to do because peer is not involved */
b38d7324
UB		 2199 break;
2200 }
76aa7d8c 2201 if (do_shutdown && smc->clcsock)
1255fcb2 2202 rc1 = kernel_sock_shutdown(smc->clcsock, how);
b38d7324
UB		 2203 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2204 sk->sk_shutdown |= how + 1;
ac713874
UB		 2205
2206out:
2207 release_sock(sk);
b38d7324 2208 return rc ? rc : rc1;
ac713874
UB		 2209}
2210
2211static int smc_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 2212 sockptr_t optval, unsigned int optlen)
ac713874
UB		 2213{
2214 struct sock *sk = sock->sk;
2215 struct smc_sock *smc;
01d2f7e2 2216 int val, rc;
ac713874 2217
86214366
CW		 2218 if (level == SOL_TCP && optname == TCP_ULP)
2219 return -EOPNOTSUPP;
2220
ac713874
UB		 2221 smc = smc_sk(sk);
2222
2223 /* generic setsockopts reaching us here always apply to the
2224 * CLC socket
2225 */
a44d9e72
CH		 2226 if (unlikely(!smc->clcsock->ops->setsockopt))
2227 rc = -EOPNOTSUPP;
2228 else
2229 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2230 optval, optlen);
ee9dfbef
UB		 2231 if (smc->clcsock->sk->sk_err) {
2232 sk->sk_err = smc->clcsock->sk->sk_err;
e3ae2365 2233 sk_error_report(sk);
ee9dfbef 2234 }
ee9dfbef 2235
01d2f7e2 2236 if (optlen < sizeof(int))
3dc9f558 2237 return -EINVAL;
a7b75c5a 2238 if (copy_from_sockptr(&val, optval, sizeof(int)))
ac0107ed 2239 return -EFAULT;
01d2f7e2 2240
ee9dfbef 2241 lock_sock(sk);
86434744
UB		 2242 if (rc || smc->use_fallback)
2243 goto out;
ee9dfbef 2244 switch (optname) {
ee9dfbef
UB		 2245 case TCP_FASTOPEN:
2246 case TCP_FASTOPEN_CONNECT:
2247 case TCP_FASTOPEN_KEY:
2248 case TCP_FASTOPEN_NO_COOKIE:
2249 /* option not supported by SMC */
8204df72 2250 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
e0e4b8fa 2251 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
ee9dfbef 2252 } else {
86434744 2253 rc = -EINVAL;
ee9dfbef
UB		 2254 }
2255 break;
01d2f7e2 2256 case TCP_NODELAY:
f9cedf1a
UB		 2257 if (sk->sk_state != SMC_INIT &&
2258 sk->sk_state != SMC_LISTEN &&
2259 sk->sk_state != SMC_CLOSED) {
e0e4b8fa 2260 if (val) {
194730a9 2261 SMC_STAT_INC(smc, ndly_cnt);
22ef473d
KG		 2262 mod_delayed_work(smc->conn.lgr->tx_wq,
2263 &smc->conn.tx_work, 0);
e0e4b8fa 2264 }
01d2f7e2
UB		 2265 }
2266 break;
2267 case TCP_CORK:
f9cedf1a
UB		 2268 if (sk->sk_state != SMC_INIT &&
2269 sk->sk_state != SMC_LISTEN &&
2270 sk->sk_state != SMC_CLOSED) {
e0e4b8fa 2271 if (!val) {
194730a9 2272 SMC_STAT_INC(smc, cork_cnt);
22ef473d
KG		 2273 mod_delayed_work(smc->conn.lgr->tx_wq,
2274 &smc->conn.tx_work, 0);
e0e4b8fa 2275 }
01d2f7e2
UB		 2276 }
2277 break;
abb190f1
UB		 2278 case TCP_DEFER_ACCEPT:
2279 smc->sockopt_defer_accept = val;
2280 break;
ee9dfbef
UB		 2281 default:
2282 break;
2283 }
86434744 2284out:
ee9dfbef
UB		 2285 release_sock(sk);
2286
2287 return rc;
ac713874
UB		 2288}
2289
2290static int smc_getsockopt(struct socket *sock, int level, int optname,
2291 char __user *optval, int __user *optlen)
2292{
2293 struct smc_sock *smc;
2294
2295 smc = smc_sk(sock->sk);
2296 /* socket options apply to the CLC socket */
a44d9e72
CH		 2297 if (unlikely(!smc->clcsock->ops->getsockopt))
2298 return -EOPNOTSUPP;
ac713874
UB		 2299 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2300 optval, optlen);
2301}
2302
2303static int smc_ioctl(struct socket *sock, unsigned int cmd,
2304 unsigned long arg)
2305{
de8474eb
SR		 2306 union smc_host_cursor cons, urg;
2307 struct smc_connection *conn;
ac713874 2308 struct smc_sock *smc;
9b67e26f 2309 int answ;
ac713874
UB		 2310
2311 smc = smc_sk(sock->sk);
de8474eb 2312 conn = &smc->conn;
7311d665 2313 lock_sock(&smc->sk);
9b67e26f 2314 if (smc->use_fallback) {
7311d665
UB		 2315 if (!smc->clcsock) {
2316 release_sock(&smc->sk);
9b67e26f 2317 return -EBADF;
7311d665
UB		 2318 }
2319 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2320 release_sock(&smc->sk);
2321 return answ;
9b67e26f
UB		 2322 }
2323 switch (cmd) {
2324 case SIOCINQ: /* same as FIONREAD */
1992d998
UB		 2325 if (smc->sk.sk_state == SMC_LISTEN) {
2326 release_sock(&smc->sk);
9b67e26f 2327 return -EINVAL;
1992d998 2328 }
2351abe6
UB		 2329 if (smc->sk.sk_state == SMC_INIT ||
2330 smc->sk.sk_state == SMC_CLOSED)
2331 answ = 0;
2332 else
2333 answ = atomic_read(&smc->conn.bytes_to_rcv);
9b67e26f
UB		 2334 break;
2335 case SIOCOUTQ:
2336 /* output queue size (not send + not acked) */
1992d998
UB		 2337 if (smc->sk.sk_state == SMC_LISTEN) {
2338 release_sock(&smc->sk);
9b67e26f 2339 return -EINVAL;
1992d998 2340 }
2351abe6
UB		 2341 if (smc->sk.sk_state == SMC_INIT ||
2342 smc->sk.sk_state == SMC_CLOSED)
2343 answ = 0;
2344 else
2345 answ = smc->conn.sndbuf_desc->len -
9b67e26f
UB		 2346 atomic_read(&smc->conn.sndbuf_space);
2347 break;
2348 case SIOCOUTQNSD:
2349 /* output queue size (not send only) */
1992d998
UB		 2350 if (smc->sk.sk_state == SMC_LISTEN) {
2351 release_sock(&smc->sk);
9b67e26f 2352 return -EINVAL;
1992d998 2353 }
2351abe6
UB		 2354 if (smc->sk.sk_state == SMC_INIT ||
2355 smc->sk.sk_state == SMC_CLOSED)
2356 answ = 0;
2357 else
2358 answ = smc_tx_prepared_sends(&smc->conn);
9b67e26f 2359 break;
de8474eb 2360 case SIOCATMARK:
1992d998
UB		 2361 if (smc->sk.sk_state == SMC_LISTEN) {
2362 release_sock(&smc->sk);
de8474eb 2363 return -EINVAL;
1992d998 2364 }
de8474eb
SR		 2365 if (smc->sk.sk_state == SMC_INIT ||
2366 smc->sk.sk_state == SMC_CLOSED) {
2367 answ = 0;
2368 } else {
bac6de7b
SR		 2369 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
2370 smc_curs_copy(&urg, &conn->urg_curs, conn);
de8474eb
SR		 2371 answ = smc_curs_diff(conn->rmb_desc->len,
2372 &cons, &urg) == 1;
2373 }
2374 break;
9b67e26f 2375 default:
1992d998 2376 release_sock(&smc->sk);
9b67e26f
UB		 2377 return -ENOIOCTLCMD;
2378 }
1992d998 2379 release_sock(&smc->sk);
9b67e26f
UB		 2380
2381 return put_user(answ, (int __user *)arg);
ac713874
UB		 2382}
2383
2384static ssize_t smc_sendpage(struct socket *sock, struct page *page,
2385 int offset, size_t size, int flags)
2386{
2387 struct sock *sk = sock->sk;
2388 struct smc_sock *smc;
2389 int rc = -EPIPE;
2390
2391 smc = smc_sk(sk);
2392 lock_sock(sk);
bda27ff5
SR		 2393 if (sk->sk_state != SMC_ACTIVE) {
2394 release_sock(sk);
ac713874 2395 goto out;
bda27ff5
SR		 2396 }
2397 release_sock(sk);
e0e4b8fa 2398 if (smc->use_fallback) {
ac713874
UB		 2399 rc = kernel_sendpage(smc->clcsock, page, offset,
2400 size, flags);
e0e4b8fa 2401 } else {
194730a9 2402 SMC_STAT_INC(smc, sendpage_cnt);
ac713874 2403 rc = sock_no_sendpage(sock, page, offset, size, flags);
e0e4b8fa 2404 }
ac713874
UB		 2405
2406out:
ac713874
UB		 2407 return rc;
2408}
2409
9014db20
SR		 2410/* Map the affected portions of the rmbe into an spd, note the number of bytes
2411 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
2412 * updates till whenever a respective page has been fully processed.
2413 * Note that subsequent recv() calls have to wait till all splice() processing
2414 * completed.
2415 */
ac713874
UB		 2416static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
2417 struct pipe_inode_info *pipe, size_t len,
9014db20 2418 unsigned int flags)
ac713874
UB		 2419{
2420 struct sock *sk = sock->sk;
2421 struct smc_sock *smc;
2422 int rc = -ENOTCONN;
2423
2424 smc = smc_sk(sk);
2425 lock_sock(sk);
51c5aba3
KG		 2426 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2427 /* socket was connected before, no more data to read */
2428 rc = 0;
2429 goto out;
2430 }
9014db20
SR		 2431 if (sk->sk_state == SMC_INIT ||
2432 sk->sk_state == SMC_LISTEN ||
2433 sk->sk_state == SMC_CLOSED)
2434 goto out;
2435
2436 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2437 rc = 0;
ac713874 2438 goto out;
9014db20
SR		 2439 }
2440
ac713874
UB		 2441 if (smc->use_fallback) {
2442 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
2443 pipe, len, flags);
2444 } else {
9014db20
SR		 2445 if (*ppos) {
2446 rc = -ESPIPE;
2447 goto out;
2448 }
2449 if (flags & SPLICE_F_NONBLOCK)
2450 flags = MSG_DONTWAIT;
2451 else
2452 flags = 0;
194730a9 2453 SMC_STAT_INC(smc, splice_cnt);
9014db20 2454 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
ac713874
UB		 2455 }
2456out:
2457 release_sock(sk);
9014db20 2458
ac713874
UB		 2459 return rc;
2460}
2461
2462/* must look like tcp */
2463static const struct proto_ops smc_sock_ops = {
2464 .family = PF_SMC,
2465 .owner = THIS_MODULE,
2466 .release = smc_release,
2467 .bind = smc_bind,
2468 .connect = smc_connect,
2469 .socketpair = sock_no_socketpair,
2470 .accept = smc_accept,
2471 .getname = smc_getname,
a11e1d43 2472 .poll = smc_poll,
ac713874
UB		 2473 .ioctl = smc_ioctl,
2474 .listen = smc_listen,
2475 .shutdown = smc_shutdown,
2476 .setsockopt = smc_setsockopt,
2477 .getsockopt = smc_getsockopt,
2478 .sendmsg = smc_sendmsg,
2479 .recvmsg = smc_recvmsg,
2480 .mmap = sock_no_mmap,
2481 .sendpage = smc_sendpage,
2482 .splice_read = smc_splice_read,
2483};
2484
2485static int smc_create(struct net *net, struct socket *sock, int protocol,
2486 int kern)
2487{
aaa4d33f 2488 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
ac713874
UB		 2489 struct smc_sock *smc;
2490 struct sock *sk;
2491 int rc;
2492
2493 rc = -ESOCKTNOSUPPORT;
2494 if (sock->type != SOCK_STREAM)
2495 goto out;
2496
2497 rc = -EPROTONOSUPPORT;
aaa4d33f 2498 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
ac713874
UB		 2499 goto out;
2500
2501 rc = -ENOBUFS;
2502 sock->ops = &smc_sock_ops;
aaa4d33f 2503 sk = smc_sock_alloc(net, sock, protocol);
ac713874
UB		 2504 if (!sk)
2505 goto out;
2506
2507 /* create internal TCP socket for CLC handshake and fallback */
2508 smc = smc_sk(sk);
a046d57d 2509 smc->use_fallback = false; /* assume rdma capability first */
603cc149 2510 smc->fallback_rsn = 0;
aaa4d33f
KG		 2511 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2512 &smc->clcsock);
a5dcb73b 2513 if (rc) {
ac713874 2514 sk_common_release(sk);
a5dcb73b
DC		 2515 goto out;
2516 }
cd6851f3
UB		 2517 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2518 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
ac713874
UB		 2519
2520out:
2521 return rc;
2522}
2523
2524static const struct net_proto_family smc_sock_family_ops = {
2525 .family = PF_SMC,
2526 .owner = THIS_MODULE,
2527 .create = smc_create,
2528};
2529
64e28b52
HW		 2530unsigned int smc_net_id;
2531
2532static __net_init int smc_net_init(struct net *net)
2533{
2534 return smc_pnet_net_init(net);
2535}
2536
2537static void __net_exit smc_net_exit(struct net *net)
2538{
2539 smc_pnet_net_exit(net);
2540}
2541
194730a9
GG		 2542static __net_init int smc_net_stat_init(struct net *net)
2543{
2544 return smc_stats_init(net);
2545}
2546
2547static void __net_exit smc_net_stat_exit(struct net *net)
2548{
2549 smc_stats_exit(net);
2550}
2551
64e28b52
HW		 2552static struct pernet_operations smc_net_ops = {
2553 .init = smc_net_init,
2554 .exit = smc_net_exit,
2555 .id = &smc_net_id,
2556 .size = sizeof(struct smc_net),
2557};
2558
194730a9
GG		 2559static struct pernet_operations smc_net_stat_ops = {
2560 .init = smc_net_stat_init,
2561 .exit = smc_net_stat_exit,
2562};
2563
ac713874
UB		 2564static int __init smc_init(void)
2565{
2566 int rc;
2567
64e28b52
HW		 2568 rc = register_pernet_subsys(&smc_net_ops);
2569 if (rc)
2570 return rc;
2571
194730a9
GG		 2572 rc = register_pernet_subsys(&smc_net_stat_ops);
2573 if (rc)
2574 return rc;
2575
201091eb 2576 smc_ism_init();
b81a5eb7 2577 smc_clc_init();
201091eb 2578
e8372d9d 2579 rc = smc_nl_init();
6812baab 2580 if (rc)
8c33bf1b 2581 goto out_pernet_subsys;
6812baab 2582
e8372d9d
GG		 2583 rc = smc_pnet_init();
2584 if (rc)
2585 goto out_nl;
2586
22ef473d
KG		 2587 rc = -ENOMEM;
2588 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
2589 if (!smc_hs_wq)
2590 goto out_pnet;
2591
2592 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
2593 if (!smc_close_wq)
2594 goto out_alloc_hs_wq;
2595
6dabd405
UB		 2596 rc = smc_core_init();
2597 if (rc) {
2598 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
194730a9 2599 goto out_alloc_wqs;
6dabd405
UB		 2600 }
2601
9bf9abea
UB		 2602 rc = smc_llc_init();
2603 if (rc) {
2604 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
6dabd405 2605 goto out_core;
9bf9abea
UB		 2606 }
2607
5f08318f
UB		 2608 rc = smc_cdc_init();
2609 if (rc) {
2610 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
6dabd405 2611 goto out_core;
5f08318f
UB		 2612 }
2613
ac713874
UB		 2614 rc = proto_register(&smc_proto, 1);
2615 if (rc) {
aaa4d33f 2616 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
6dabd405 2617 goto out_core;
ac713874
UB		 2618 }
2619
aaa4d33f
KG		 2620 rc = proto_register(&smc_proto6, 1);
2621 if (rc) {
2622 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2623 goto out_proto;
2624 }
2625
ac713874
UB		 2626 rc = sock_register(&smc_sock_family_ops);
2627 if (rc) {
2628 pr_err("%s: sock_register fails with %d\n", __func__, rc);
aaa4d33f 2629 goto out_proto6;
ac713874 2630 }
f16a7dd5 2631 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
aaa4d33f 2632 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
ac713874 2633
a4cf0443
UB		 2634 rc = smc_ib_register_client();
2635 if (rc) {
2636 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2637 goto out_sock;
2638 }
2639
c5c1cc9c 2640 static_branch_enable(&tcp_have_smc);
ac713874
UB		 2641 return 0;
2642
a4cf0443
UB		 2643out_sock:
2644 sock_unregister(PF_SMC);
aaa4d33f
KG		 2645out_proto6:
2646 proto_unregister(&smc_proto6);
ac713874
UB		 2647out_proto:
2648 proto_unregister(&smc_proto);
6dabd405
UB		 2649out_core:
2650 smc_core_exit();
22ef473d
KG		 2651out_alloc_wqs:
2652 destroy_workqueue(smc_close_wq);
2653out_alloc_hs_wq:
2654 destroy_workqueue(smc_hs_wq);
6812baab
TR		 2655out_pnet:
2656 smc_pnet_exit();
e8372d9d
GG		 2657out_nl:
2658 smc_nl_exit();
8c33bf1b
Y		 2659out_pernet_subsys:
2660 unregister_pernet_subsys(&smc_net_ops);
2661
ac713874
UB		 2662 return rc;
2663}
2664
2665static void __exit smc_exit(void)
2666{
c5c1cc9c 2667 static_branch_disable(&tcp_have_smc);
ac713874 2668 sock_unregister(PF_SMC);
6dabd405
UB		 2669 smc_core_exit();
2670 smc_ib_unregister_client();
22ef473d
KG		 2671 destroy_workqueue(smc_close_wq);
2672 destroy_workqueue(smc_hs_wq);
aaa4d33f 2673 proto_unregister(&smc_proto6);
ac713874 2674 proto_unregister(&smc_proto);
6812baab 2675 smc_pnet_exit();
e8372d9d 2676 smc_nl_exit();
194730a9 2677 unregister_pernet_subsys(&smc_net_stat_ops);
64e28b52 2678 unregister_pernet_subsys(&smc_net_ops);
4ead9c96 2679 rcu_barrier();
ac713874
UB		 2680}
2681
2682module_init(smc_init);
2683module_exit(smc_exit);
2684
2685MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2686MODULE_DESCRIPTION("smc socket address family");
2687MODULE_LICENSE("GPL");
2688MODULE_ALIAS_NETPROTO(PF_SMC);
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