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Merge tag 'v6.4-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-block.git] / net / smc / af_smc.c
CommitLineData
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>
509f15b9 30#include <linux/splice.h>
c3edc401 31
ac713874 32#include <net/sock.h>
a046d57d 33#include <net/tcp.h>
f16a7dd5 34#include <net/smc.h>
9b67e26f 35#include <asm/ioctls.h>
ac713874 36
64e28b52
HW		 37#include <net/net_namespace.h>
38#include <net/netns/generic.h>
39#include "smc_netns.h"
40
ac713874 41#include "smc.h"
a046d57d 42#include "smc_clc.h"
9bf9abea 43#include "smc_llc.h"
5f08318f 44#include "smc_cdc.h"
0cfdd8f9 45#include "smc_core.h"
a4cf0443 46#include "smc_ib.h"
41349844 47#include "smc_ism.h"
6812baab 48#include "smc_pnet.h"
e8372d9d 49#include "smc_netlink.h"
e6727f39 50#include "smc_tx.h"
952310cc 51#include "smc_rx.h"
b38d7324 52#include "smc_close.h"
e0e4b8fa 53#include "smc_stats.h"
48262608 54#include "smc_tracepoint.h"
462791bb 55#include "smc_sysctl.h"
ac713874 56
72a36a8a
HW		 57static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
58 * creation on server
59 */
60static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
61 * creation on client
0cfdd8f9
UB		 62 */
63
3079e342 64static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */
22ef473d
KG		 65struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
66struct workqueue_struct *smc_close_wq; /* wq for close work */
67
a046d57d 68static void smc_tcp_listen_work(struct work_struct *);
24ac3a08 69static void smc_connect_work(struct work_struct *);
a046d57d 70
f9496b7c
W		 71int smc_nl_dump_hs_limitation(struct sk_buff *skb, struct netlink_callback *cb)
72{
73 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
74 void *hdr;
75
76 if (cb_ctx->pos[0])
77 goto out;
78
79 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
80 &smc_gen_nl_family, NLM_F_MULTI,
81 SMC_NETLINK_DUMP_HS_LIMITATION);
82 if (!hdr)
83 return -ENOMEM;
84
85 if (nla_put_u8(skb, SMC_NLA_HS_LIMITATION_ENABLED,
86 sock_net(skb->sk)->smc.limit_smc_hs))
87 goto err;
88
89 genlmsg_end(skb, hdr);
90 cb_ctx->pos[0] = 1;
91out:
92 return skb->len;
93err:
94 genlmsg_cancel(skb, hdr);
95 return -EMSGSIZE;
96}
97
98int smc_nl_enable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
99{
100 sock_net(skb->sk)->smc.limit_smc_hs = true;
101 return 0;
102}
103
104int smc_nl_disable_hs_limitation(struct sk_buff *skb, struct genl_info *info)
105{
106 sock_net(skb->sk)->smc.limit_smc_hs = false;
107 return 0;
108}
109
ac713874
UB		 110static void smc_set_keepalive(struct sock *sk, int val)
111{
112 struct smc_sock *smc = smc_sk(sk);
113
114 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
115}
116
8270d9c2
W		 117static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk,
118 struct sk_buff *skb,
119 struct request_sock *req,
120 struct dst_entry *dst,
121 struct request_sock *req_unhash,
122 bool *own_req)
123{
124 struct smc_sock *smc;
49b7d376 125 struct sock *child;
8270d9c2
W		 126
127 smc = smc_clcsock_user_data(sk);
128
129 if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) >
130 sk->sk_max_ack_backlog)
131 goto drop;
132
133 if (sk_acceptq_is_full(&smc->sk)) {
134 NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
135 goto drop;
136 }
137
138 /* passthrough to original syn recv sock fct */
49b7d376
KG		 139 child = smc->ori_af_ops->syn_recv_sock(sk, skb, req, dst, req_unhash,
140 own_req);
141 /* child must not inherit smc or its ops */
142 if (child) {
143 rcu_assign_sk_user_data(child, NULL);
144
145 /* v4-mapped sockets don't inherit parent ops. Don't restore. */
146 if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops)
147 inet_csk(child)->icsk_af_ops = smc->ori_af_ops;
148 }
149 return child;
8270d9c2
W		 150
151drop:
152 dst_release(dst);
153 tcp_listendrop(sk);
154 return NULL;
155}
156
48b6190a
W		 157static bool smc_hs_congested(const struct sock *sk)
158{
159 const struct smc_sock *smc;
160
161 smc = smc_clcsock_user_data(sk);
162
163 if (!smc)
164 return true;
165
166 if (workqueue_congested(WORK_CPU_UNBOUND, smc_hs_wq))
167 return true;
168
169 return false;
170}
171
f16a7dd5
UB		 172static struct smc_hashinfo smc_v4_hashinfo = {
173 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
174};
175
aaa4d33f
KG		 176static struct smc_hashinfo smc_v6_hashinfo = {
177 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
178};
179
f16a7dd5
UB		 180int smc_hash_sk(struct sock *sk)
181{
182 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
183 struct hlist_head *head;
184
185 head = &h->ht;
186
187 write_lock_bh(&h->lock);
188 sk_add_node(sk, head);
f16a7dd5 189 write_unlock_bh(&h->lock);
b3cb764a 190 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
f16a7dd5
UB		 191
192 return 0;
193}
194EXPORT_SYMBOL_GPL(smc_hash_sk);
195
196void smc_unhash_sk(struct sock *sk)
197{
198 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
199
200 write_lock_bh(&h->lock);
201 if (sk_del_node_init(sk))
202 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
203 write_unlock_bh(&h->lock);
204}
205EXPORT_SYMBOL_GPL(smc_unhash_sk);
206
6b88af83
DL		 207/* This will be called before user really release sock_lock. So do the
208 * work which we didn't do because of user hold the sock_lock in the
209 * BH context
210 */
211static void smc_release_cb(struct sock *sk)
212{
213 struct smc_sock *smc = smc_sk(sk);
214
215 if (smc->conn.tx_in_release_sock) {
216 smc_tx_pending(&smc->conn);
217 smc->conn.tx_in_release_sock = false;
218 }
219}
220
f16a7dd5 221struct proto smc_proto = {
ac713874
UB		 222 .name = "SMC",
223 .owner = THIS_MODULE,
224 .keepalive = smc_set_keepalive,
f16a7dd5
UB		 225 .hash = smc_hash_sk,
226 .unhash = smc_unhash_sk,
6b88af83 227 .release_cb = smc_release_cb,
ac713874 228 .obj_size = sizeof(struct smc_sock),
f16a7dd5 229 .h.smc_hash = &smc_v4_hashinfo,
5f0d5a3a 230 .slab_flags = SLAB_TYPESAFE_BY_RCU,
ac713874 231};
f16a7dd5 232EXPORT_SYMBOL_GPL(smc_proto);
ac713874 233
aaa4d33f
KG		 234struct proto smc_proto6 = {
235 .name = "SMC6",
236 .owner = THIS_MODULE,
237 .keepalive = smc_set_keepalive,
238 .hash = smc_hash_sk,
239 .unhash = smc_unhash_sk,
6b88af83 240 .release_cb = smc_release_cb,
aaa4d33f
KG		 241 .obj_size = sizeof(struct smc_sock),
242 .h.smc_hash = &smc_v6_hashinfo,
243 .slab_flags = SLAB_TYPESAFE_BY_RCU,
244};
245EXPORT_SYMBOL_GPL(smc_proto6);
246
0558226c
WG		 247static void smc_fback_restore_callbacks(struct smc_sock *smc)
248{
249 struct sock *clcsk = smc->clcsock->sk;
250
251 write_lock_bh(&clcsk->sk_callback_lock);
252 clcsk->sk_user_data = NULL;
253
254 smc_clcsock_restore_cb(&clcsk->sk_state_change, &smc->clcsk_state_change);
255 smc_clcsock_restore_cb(&clcsk->sk_data_ready, &smc->clcsk_data_ready);
256 smc_clcsock_restore_cb(&clcsk->sk_write_space, &smc->clcsk_write_space);
257 smc_clcsock_restore_cb(&clcsk->sk_error_report, &smc->clcsk_error_report);
258
259 write_unlock_bh(&clcsk->sk_callback_lock);
260}
261
f536dffc
UB		 262static void smc_restore_fallback_changes(struct smc_sock *smc)
263{
1ad24058
KG		 264 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
265 smc->clcsock->file->private_data = smc->sk.sk_socket;
266 smc->clcsock->file = NULL;
0558226c 267 smc_fback_restore_callbacks(smc);
1ad24058 268 }
f536dffc
UB		 269}
270
39f41f36 271static int __smc_release(struct smc_sock *smc)
ac713874 272{
39f41f36 273 struct sock *sk = &smc->sk;
b38d7324 274 int rc = 0;
ac713874 275
51f1de79 276 if (!smc->use_fallback) {
b38d7324
UB		 277 rc = smc_close_active(smc);
278 sock_set_flag(sk, SOCK_DEAD);
279 sk->sk_shutdown |= SHUTDOWN_MASK;
b03faa1f 280 } else {
e5d5aadc
DL		 281 if (sk->sk_state != SMC_CLOSED) {
282 if (sk->sk_state != SMC_LISTEN &&
283 sk->sk_state != SMC_INIT)
284 sock_put(sk); /* passive closing */
285 if (sk->sk_state == SMC_LISTEN) {
286 /* wake up clcsock accept */
287 rc = kernel_sock_shutdown(smc->clcsock,
288 SHUT_RDWR);
289 }
290 sk->sk_state = SMC_CLOSED;
291 sk->sk_state_change(sk);
78abe3d0 292 }
f536dffc 293 smc_restore_fallback_changes(smc);
51f1de79 294 }
ac713874 295
b03faa1f
UB		 296 sk->sk_prot->unhash(sk);
297
298 if (sk->sk_state == SMC_CLOSED) {
299 if (smc->clcsock) {
fd57770d
KG		 300 release_sock(sk);
301 smc_clcsock_release(smc);
302 lock_sock(sk);
b03faa1f
UB		 303 }
304 if (!smc->use_fallback)
305 smc_conn_free(&smc->conn);
306 }
307
39f41f36
UB		 308 return rc;
309}
310
311static int smc_release(struct socket *sock)
312{
313 struct sock *sk = sock->sk;
314 struct smc_sock *smc;
9f1c50cf 315 int old_state, rc = 0;
39f41f36
UB		 316
317 if (!sk)
318 goto out;
319
81cf4f47 320 sock_hold(sk); /* sock_put below */
39f41f36
UB		 321 smc = smc_sk(sk);
322
9f1c50cf
W		 323 old_state = sk->sk_state;
324
39f41f36 325 /* cleanup for a dangling non-blocking connect */
9f1c50cf 326 if (smc->connect_nonblock && old_state == SMC_INIT)
39f41f36 327 tcp_abort(smc->clcsock->sk, ECONNABORTED);
5c15b312
W		 328
329 if (cancel_work_sync(&smc->connect_work))
330 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
39f41f36
UB		 331
332 if (sk->sk_state == SMC_LISTEN)
333 /* smc_close_non_accepted() is called and acquires
334 * sock lock for child sockets again
335 */
336 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
337 else
338 lock_sock(sk);
339
9f1c50cf
W		 340 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
341 !smc->use_fallback)
342 smc_close_active_abort(smc);
343
39f41f36
UB		 344 rc = __smc_release(smc);
345
ac713874
UB		 346 /* detach socket */
347 sock_orphan(sk);
348 sock->sk = NULL;
349 release_sock(sk);
350
81cf4f47 351 sock_put(sk); /* sock_hold above */
51f1de79 352 sock_put(sk); /* final sock_put */
ac713874 353out:
b38d7324 354 return rc;
ac713874
UB		 355}
356
357static void smc_destruct(struct sock *sk)
358{
359 if (sk->sk_state != SMC_CLOSED)
360 return;
361 if (!sock_flag(sk, SOCK_DEAD))
362 return;
ac713874
UB		 363}
364
aaa4d33f
KG		 365static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
366 int protocol)
ac713874
UB		 367{
368 struct smc_sock *smc;
aaa4d33f 369 struct proto *prot;
ac713874
UB		 370 struct sock *sk;
371
aaa4d33f
KG		 372 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
373 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
ac713874
UB		 374 if (!sk)
375 return NULL;
376
377 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
378 sk->sk_state = SMC_INIT;
379 sk->sk_destruct = smc_destruct;
aaa4d33f 380 sk->sk_protocol = protocol;
0227f058
TL		 381 WRITE_ONCE(sk->sk_sndbuf, READ_ONCE(net->smc.sysctl_wmem));
382 WRITE_ONCE(sk->sk_rcvbuf, READ_ONCE(net->smc.sysctl_rmem));
ac713874 383 smc = smc_sk(sk);
a046d57d 384 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
24ac3a08 385 INIT_WORK(&smc->connect_work, smc_connect_work);
be7f3e59 386 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
a046d57d
UB		 387 INIT_LIST_HEAD(&smc->accept_q);
388 spin_lock_init(&smc->accept_q_lock);
be7f3e59 389 spin_lock_init(&smc->conn.send_lock);
f16a7dd5 390 sk->sk_prot->hash(sk);
78abe3d0 391 mutex_init(&smc->clcsock_release_lock);
97b9af7a 392 smc_init_saved_callbacks(smc);
ac713874
UB		 393
394 return sk;
395}
396
397static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
398 int addr_len)
399{
400 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
401 struct sock *sk = sock->sk;
402 struct smc_sock *smc;
403 int rc;
404
405 smc = smc_sk(sk);
406
407 /* replicate tests from inet_bind(), to be safe wrt. future changes */
408 rc = -EINVAL;
409 if (addr_len < sizeof(struct sockaddr_in))
410 goto out;
411
412 rc = -EAFNOSUPPORT;
aaa4d33f
KG		 413 if (addr->sin_family != AF_INET &&
414 addr->sin_family != AF_INET6 &&
415 addr->sin_family != AF_UNSPEC)
416 goto out;
ac713874 417 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
aaa4d33f
KG		 418 if (addr->sin_family == AF_UNSPEC &&
419 addr->sin_addr.s_addr != htonl(INADDR_ANY))
ac713874
UB		 420 goto out;
421
422 lock_sock(sk);
423
424 /* Check if socket is already active */
425 rc = -EINVAL;
cd206360 426 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
ac713874
UB		 427 goto out_rel;
428
429 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
6627a207 430 smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
ac713874
UB		 431 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
432
433out_rel:
434 release_sock(sk);
435out:
436 return rc;
437}
438
439static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
440 unsigned long mask)
441{
442 /* options we don't get control via setsockopt for */
443 nsk->sk_type = osk->sk_type;
444 nsk->sk_sndbuf = osk->sk_sndbuf;
445 nsk->sk_rcvbuf = osk->sk_rcvbuf;
446 nsk->sk_sndtimeo = osk->sk_sndtimeo;
447 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
448 nsk->sk_mark = osk->sk_mark;
449 nsk->sk_priority = osk->sk_priority;
450 nsk->sk_rcvlowat = osk->sk_rcvlowat;
451 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
452 nsk->sk_err = osk->sk_err;
453
454 nsk->sk_flags &= ~mask;
455 nsk->sk_flags |= osk->sk_flags & mask;
456}
457
458#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
459 (1UL << SOCK_KEEPOPEN) | \
460 (1UL << SOCK_LINGER) | \
461 (1UL << SOCK_BROADCAST) | \
462 (1UL << SOCK_TIMESTAMP) | \
463 (1UL << SOCK_DBG) | \
464 (1UL << SOCK_RCVTSTAMP) | \
465 (1UL << SOCK_RCVTSTAMPNS) | \
466 (1UL << SOCK_LOCALROUTE) | \
467 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
468 (1UL << SOCK_RXQ_OVFL) | \
469 (1UL << SOCK_WIFI_STATUS) | \
470 (1UL << SOCK_NOFCS) | \
9718475e
DD		 471 (1UL << SOCK_FILTER_LOCKED) | \
472 (1UL << SOCK_TSTAMP_NEW))
ac713874
UB		 473/* copy only relevant settings and flags of SOL_SOCKET level from smc to
474 * clc socket (since smc is not called for these options from net/core)
475 */
476static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
477{
478 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
479}
480
481#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
482 (1UL << SOCK_KEEPOPEN) | \
483 (1UL << SOCK_LINGER) | \
484 (1UL << SOCK_DBG))
485/* copy only settings and flags relevant for smc from clc to smc socket */
486static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
487{
488 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
489}
490
b8d19945
WG		 491/* register the new vzalloced sndbuf on all links */
492static int smcr_lgr_reg_sndbufs(struct smc_link *link,
493 struct smc_buf_desc *snd_desc)
494{
495 struct smc_link_group *lgr = link->lgr;
496 int i, rc = 0;
497
498 if (!snd_desc->is_vm)
499 return -EINVAL;
500
501 /* protect against parallel smcr_link_reg_buf() */
b5dd4d69 502 down_write(&lgr->llc_conf_mutex);
b8d19945
WG		 503 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
504 if (!smc_link_active(&lgr->lnk[i]))
505 continue;
506 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
507 if (rc)
508 break;
509 }
b5dd4d69 510 up_write(&lgr->llc_conf_mutex);
b8d19945
WG		 511 return rc;
512}
513
b9247544 514/* register the new rmb on all links */
7562a13d 515static int smcr_lgr_reg_rmbs(struct smc_link *link,
b9247544
KG		 516 struct smc_buf_desc *rmb_desc)
517{
7562a13d 518 struct smc_link_group *lgr = link->lgr;
4da68744 519 bool do_slow = false;
7562a13d 520 int i, rc = 0;
b9247544 521
d5500667
KG		 522 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
523 if (rc)
524 return rc;
4da68744
W		 525
526 down_read(&lgr->llc_conf_mutex);
527 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
528 if (!smc_link_active(&lgr->lnk[i]))
529 continue;
530 if (!rmb_desc->is_reg_mr[link->link_idx]) {
531 up_read(&lgr->llc_conf_mutex);
532 goto slow_path;
533 }
534 }
535 /* mr register already */
536 goto fast_path;
537slow_path:
538 do_slow = true;
d5500667 539 /* protect against parallel smc_llc_cli_rkey_exchange() and
b8d19945 540 * parallel smcr_link_reg_buf()
d5500667 541 */
b5dd4d69 542 down_write(&lgr->llc_conf_mutex);
b9247544 543 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 544 if (!smc_link_active(&lgr->lnk[i]))
b9247544 545 continue;
b8d19945 546 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
b9247544 547 if (rc)
7562a13d 548 goto out;
44aa81ce 549 }
4da68744 550fast_path:
7562a13d
KG		 551 /* exchange confirm_rkey msg with peer */
552 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
553 if (rc) {
554 rc = -EFAULT;
555 goto out;
556 }
557 rmb_desc->is_conf_rkey = true;
558out:
4da68744 559 do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
d5500667 560 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
7562a13d 561 return rc;
e63a5f8c
KG		 562}
563
b9247544 564static int smcr_clnt_conf_first_link(struct smc_sock *smc)
9bf9abea 565{
387707fd 566 struct smc_link *link = smc->conn.lnk;
0fb0b02b 567 struct smc_llc_qentry *qentry;
9bf9abea
UB		 568 int rc;
569
9bf9abea 570 /* receive CONFIRM LINK request from server over RoCE fabric */
0fb0b02b
KG		 571 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
572 SMC_LLC_CONFIRM_LINK);
573 if (!qentry) {
9bf9abea
UB		 574 struct smc_clc_msg_decline dclc;
575
576 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 577 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
9ed28556 578 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
9bf9abea 579 }
649758ff 580 smc_llc_save_peer_uid(qentry);
0fb0b02b
KG		 581 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
582 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
583 if (rc)
75d320d6
KG		 584 return SMC_CLC_DECL_RMBE_EC;
585
9bf9abea
UB		 586 rc = smc_ib_modify_qp_rts(link);
587 if (rc)
603cc149 588 return SMC_CLC_DECL_ERR_RDYLNK;
9bf9abea
UB		 589
590 smc_wr_remember_qp_attr(link);
652a1e41 591
b8d19945
WG		 592 /* reg the sndbuf if it was vzalloced */
593 if (smc->conn.sndbuf_desc->is_vm) {
594 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
595 return SMC_CLC_DECL_ERR_REGBUF;
596 }
597
598 /* reg the rmb */
599 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
600 return SMC_CLC_DECL_ERR_REGBUF;
652a1e41 601
0fb0b02b
KG		 602 /* confirm_rkey is implicit on 1st contact */
603 smc->conn.rmb_desc->is_conf_rkey = true;
604
9bf9abea 605 /* send CONFIRM LINK response over RoCE fabric */
947541f3 606 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
9bf9abea 607 if (rc < 0)
603cc149 608 return SMC_CLC_DECL_TIMEOUT_CL;
9bf9abea 609
0fb0b02b 610 smc_llc_link_active(link);
0a99be43 611 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
0fb0b02b
KG		 612
613 /* optional 2nd link, receive ADD LINK request from server */
614 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
615 SMC_LLC_ADD_LINK);
616 if (!qentry) {
52bedf37
KG		 617 struct smc_clc_msg_decline dclc;
618
619 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 620 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
0fb0b02b
KG		 621 if (rc == -EAGAIN)
622 rc = 0; /* no DECLINE received, go with one link */
623 return rc;
52bedf37 624 }
0fb0b02b 625 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
b1570a87 626 smc_llc_cli_add_link(link, qentry);
75d320d6 627 return 0;
9bf9abea
UB		 628}
629
e5c4744c
KG		 630static bool smc_isascii(char *hostname)
631{
632 int i;
633
634 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
635 if (!isascii(hostname[i]))
636 return false;
637 return true;
638}
639
640static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
641 struct smc_clc_msg_accept_confirm *clc)
642{
643 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
644 (struct smc_clc_msg_accept_confirm_v2 *)clc;
645 struct smc_clc_first_contact_ext *fce;
646 int clc_v2_len;
647
648 if (clc->hdr.version == SMC_V1 ||
649 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
650 return;
651
652 if (smc->conn.lgr->is_smcd) {
653 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
654 SMC_MAX_EID_LEN);
655 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
656 d1);
657 } else {
658 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
659 SMC_MAX_EID_LEN);
660 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
661 r1);
662 }
663 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
664 smc->conn.lgr->peer_os = fce->os_type;
665 smc->conn.lgr->peer_smc_release = fce->release;
666 if (smc_isascii(fce->hostname))
667 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
668 SMC_MAX_HOSTNAME_LEN);
669}
670
41349844
HW		 671static void smcr_conn_save_peer_info(struct smc_sock *smc,
672 struct smc_clc_msg_accept_confirm *clc)
0cfdd8f9 673{
3d9725a6 674 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
95d8d263 675
3d9725a6
UB		 676 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
677 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
95d8d263 678 smc->conn.peer_rmbe_size = bufsize;
cd6851f3 679 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
95d8d263 680 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
0cfdd8f9
UB		 681}
682
41349844
HW		 683static void smcd_conn_save_peer_info(struct smc_sock *smc,
684 struct smc_clc_msg_accept_confirm *clc)
685{
3d9725a6 686 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
41349844 687
3d9725a6
UB		 688 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
689 smc->conn.peer_token = clc->d0.token;
41349844
HW		 690 /* msg header takes up space in the buffer */
691 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
692 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
693 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
694}
695
696static void smc_conn_save_peer_info(struct smc_sock *smc,
697 struct smc_clc_msg_accept_confirm *clc)
698{
699 if (smc->conn.lgr->is_smcd)
700 smcd_conn_save_peer_info(smc, clc);
701 else
702 smcr_conn_save_peer_info(smc, clc);
e5c4744c 703 smc_conn_save_peer_info_fce(smc, clc);
41349844
HW		 704}
705
0cfdd8f9 706static void smc_link_save_peer_info(struct smc_link *link,
e5c4744c
KG		 707 struct smc_clc_msg_accept_confirm *clc,
708 struct smc_init_info *ini)
0cfdd8f9 709{
3d9725a6 710 link->peer_qpn = ntoh24(clc->r0.qpn);
e5c4744c
KG		 711 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
712 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
3d9725a6
UB		 713 link->peer_psn = ntoh24(clc->r0.psn);
714 link->peer_mtu = clc->r0.qp_mtu;
0cfdd8f9
UB		 715}
716
e0e4b8fa
GG		 717static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
718 struct smc_stats_fback *fback_arr)
719{
720 int cnt;
721
722 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
723 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
724 fback_arr[cnt].count++;
725 break;
726 }
727 if (!fback_arr[cnt].fback_code) {
728 fback_arr[cnt].fback_code = smc->fallback_rsn;
729 fback_arr[cnt].count++;
730 break;
731 }
732 }
733}
734
735static void smc_stat_fallback(struct smc_sock *smc)
736{
194730a9
GG		 737 struct net *net = sock_net(&smc->sk);
738
739 mutex_lock(&net->smc.mutex_fback_rsn);
e0e4b8fa 740 if (smc->listen_smc) {
194730a9
GG		 741 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
742 net->smc.fback_rsn->srv_fback_cnt++;
e0e4b8fa 743 } else {
194730a9
GG		 744 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
745 net->smc.fback_rsn->clnt_fback_cnt++;
e0e4b8fa 746 }
194730a9 747 mutex_unlock(&net->smc.mutex_fback_rsn);
e0e4b8fa
GG		 748}
749
341adeec
WG		 750/* must be called under rcu read lock */
751static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
752{
753 struct socket_wq *wq;
754 __poll_t flags;
755
756 wq = rcu_dereference(smc->sk.sk_wq);
757 if (!skwq_has_sleeper(wq))
758 return;
759
760 /* wake up smc sk->sk_wq */
761 if (!key) {
762 /* sk_state_change */
763 wake_up_interruptible_all(&wq->wait);
764 } else {
765 flags = key_to_poll(key);
766 if (flags & (EPOLLIN | EPOLLOUT))
767 /* sk_data_ready or sk_write_space */
768 wake_up_interruptible_sync_poll(&wq->wait, flags);
769 else if (flags & EPOLLERR)
770 /* sk_error_report */
771 wake_up_interruptible_poll(&wq->wait, flags);
772 }
773}
774
775static int smc_fback_mark_woken(wait_queue_entry_t *wait,
776 unsigned int mode, int sync, void *key)
777{
778 struct smc_mark_woken *mark =
779 container_of(wait, struct smc_mark_woken, wait_entry);
780
781 mark->woken = true;
782 mark->key = key;
783 return 0;
784}
785
786static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
787 void (*clcsock_callback)(struct sock *sk))
788{
789 struct smc_mark_woken mark = { .woken = false };
790 struct socket_wq *wq;
791
792 init_waitqueue_func_entry(&mark.wait_entry,
793 smc_fback_mark_woken);
794 rcu_read_lock();
795 wq = rcu_dereference(clcsk->sk_wq);
796 if (!wq)
797 goto out;
798 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
799 clcsock_callback(clcsk);
800 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
801
802 if (mark.woken)
803 smc_fback_wakeup_waitqueue(smc, mark.key);
804out:
805 rcu_read_unlock();
806}
807
808static void smc_fback_state_change(struct sock *clcsk)
809{
0558226c 810 struct smc_sock *smc;
341adeec 811
0558226c
WG		 812 read_lock_bh(&clcsk->sk_callback_lock);
813 smc = smc_clcsock_user_data(clcsk);
814 if (smc)
815 smc_fback_forward_wakeup(smc, clcsk,
816 smc->clcsk_state_change);
817 read_unlock_bh(&clcsk->sk_callback_lock);
341adeec
WG		 818}
819
820static void smc_fback_data_ready(struct sock *clcsk)
821{
0558226c 822 struct smc_sock *smc;
341adeec 823
0558226c
WG		 824 read_lock_bh(&clcsk->sk_callback_lock);
825 smc = smc_clcsock_user_data(clcsk);
826 if (smc)
827 smc_fback_forward_wakeup(smc, clcsk,
828 smc->clcsk_data_ready);
829 read_unlock_bh(&clcsk->sk_callback_lock);
341adeec
WG		 830}
831
832static void smc_fback_write_space(struct sock *clcsk)
833{
0558226c 834 struct smc_sock *smc;
341adeec 835
0558226c
WG		 836 read_lock_bh(&clcsk->sk_callback_lock);
837 smc = smc_clcsock_user_data(clcsk);
838 if (smc)
839 smc_fback_forward_wakeup(smc, clcsk,
840 smc->clcsk_write_space);
841 read_unlock_bh(&clcsk->sk_callback_lock);
341adeec
WG		 842}
843
844static void smc_fback_error_report(struct sock *clcsk)
845{
0558226c 846 struct smc_sock *smc;
341adeec 847
0558226c
WG		 848 read_lock_bh(&clcsk->sk_callback_lock);
849 smc = smc_clcsock_user_data(clcsk);
850 if (smc)
851 smc_fback_forward_wakeup(smc, clcsk,
852 smc->clcsk_error_report);
853 read_unlock_bh(&clcsk->sk_callback_lock);
341adeec
WG		 854}
855
97b9af7a
WG		 856static void smc_fback_replace_callbacks(struct smc_sock *smc)
857{
858 struct sock *clcsk = smc->clcsock->sk;
859
0558226c 860 write_lock_bh(&clcsk->sk_callback_lock);
97b9af7a
WG		 861 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
862
863 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
864 &smc->clcsk_state_change);
865 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
866 &smc->clcsk_data_ready);
867 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
868 &smc->clcsk_write_space);
869 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
870 &smc->clcsk_error_report);
0558226c
WG		 871
872 write_unlock_bh(&clcsk->sk_callback_lock);
97b9af7a
WG		 873}
874
c0bf3d8a 875static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
07603b23 876{
1de9770d 877 int rc = 0;
2153bd1e 878
c0bf3d8a
WG		 879 mutex_lock(&smc->clcsock_release_lock);
880 if (!smc->clcsock) {
1de9770d
WG		 881 rc = -EBADF;
882 goto out;
c0bf3d8a 883 }
341adeec 884
07603b23 885 smc->use_fallback = true;
e0e4b8fa
GG		 886 smc->fallback_rsn = reason_code;
887 smc_stat_fallback(smc);
48262608 888 trace_smc_switch_to_fallback(smc, reason_code);
07603b23
UB		 889 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
890 smc->clcsock->file = smc->sk.sk_socket->file;
891 smc->clcsock->file->private_data = smc->clcsock;
67f562e3
UB		 892 smc->clcsock->wq.fasync_list =
893 smc->sk.sk_socket->wq.fasync_list;
2153bd1e 894
341adeec
WG		 895 /* There might be some wait entries remaining
896 * in smc sk->sk_wq and they should be woken up
897 * as clcsock's wait queue is woken up.
2153bd1e 898 */
97b9af7a 899 smc_fback_replace_callbacks(smc);
07603b23 900 }
1de9770d 901out:
c0bf3d8a 902 mutex_unlock(&smc->clcsock_release_lock);
1de9770d 903 return rc;
07603b23
UB		 904}
905
3b2dec26 906/* fall back during connect */
603cc149 907static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
a046d57d 908{
c0bf3d8a
WG		 909 struct net *net = sock_net(&smc->sk);
910 int rc = 0;
911
912 rc = smc_switch_to_fallback(smc, reason_code);
913 if (rc) { /* fallback fails */
914 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
915 if (smc->sk.sk_state == SMC_INIT)
916 sock_put(&smc->sk); /* passive closing */
917 return rc;
918 }
3b2dec26 919 smc_copy_sock_settings_to_clc(smc);
50717a37 920 smc->connect_nonblock = 0;
3b2dec26
HW		 921 if (smc->sk.sk_state == SMC_INIT)
922 smc->sk.sk_state = SMC_ACTIVE;
923 return 0;
924}
51f1de79 925
3b2dec26 926/* decline and fall back during connect */
e8d726c8
UB		 927static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
928 u8 version)
3b2dec26 929{
194730a9 930 struct net *net = sock_net(&smc->sk);
3b2dec26 931 int rc;
ee9dfbef 932
e1bbdd57 933 if (reason_code < 0) { /* error, fallback is not possible */
194730a9 934 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
e1bbdd57
UB		 935 if (smc->sk.sk_state == SMC_INIT)
936 sock_put(&smc->sk); /* passive closing */
3b2dec26 937 return reason_code;
e1bbdd57 938 }
603cc149 939 if (reason_code != SMC_CLC_DECL_PEERDECL) {
e8d726c8 940 rc = smc_clc_send_decline(smc, reason_code, version);
e1bbdd57 941 if (rc < 0) {
194730a9 942 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
e1bbdd57
UB		 943 if (smc->sk.sk_state == SMC_INIT)
944 sock_put(&smc->sk); /* passive closing */
3b2dec26 945 return rc;
e1bbdd57 946 }
c5c1cc9c 947 }
603cc149 948 return smc_connect_fallback(smc, reason_code);
3b2dec26 949}
c5c1cc9c 950
8cf3f3e4 951static void smc_conn_abort(struct smc_sock *smc, int local_first)
3b2dec26 952{
36595d8a
WG		 953 struct smc_connection *conn = &smc->conn;
954 struct smc_link_group *lgr = conn->lgr;
ea89c6c0
WG		 955 bool lgr_valid = false;
956
957 if (smc_conn_lgr_valid(conn))
958 lgr_valid = true;
36595d8a
WG		 959
960 smc_conn_free(conn);
ea89c6c0 961 if (local_first && lgr_valid)
36595d8a 962 smc_lgr_cleanup_early(lgr);
3b2dec26
HW		 963}
964
965/* check if there is a rdma device available for this connection. */
966/* called for connect and listen */
228bae05 967static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
3b2dec26 968{
a046d57d
UB		 969 /* PNET table look up: search active ib_device and port
970 * within same PNETID that also contains the ethernet device
971 * used for the internal TCP socket
972 */
bc36d2fc 973 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
42042dbb
KG		 974 if (!ini->check_smcrv2 && !ini->ib_dev)
975 return SMC_CLC_DECL_NOSMCRDEV;
976 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
9aa68d29 977 return SMC_CLC_DECL_NOSMCRDEV;
bc36d2fc 978 return 0;
3b2dec26
HW		 979}
980
41349844
HW		 981/* check if there is an ISM device available for this connection. */
982/* called for connect and listen */
228bae05 983static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
41349844
HW		 984{
985 /* Find ISM device with same PNETID as connecting interface */
bc36d2fc 986 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
3fc64937 987 if (!ini->ism_dev[0])
9aa68d29 988 return SMC_CLC_DECL_NOSMCDDEV;
8caaccf5
UB		 989 else
990 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
41349844
HW		 991 return 0;
992}
993
839d696f
KG		 994/* is chid unique for the ism devices that are already determined? */
995static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
996 int cnt)
997{
998 int i = (!ini->ism_dev[0]) ? 1 : 0;
999
1000 for (; i < cnt; i++)
1001 if (ini->ism_chid[i] == chid)
1002 return false;
1003 return true;
1004}
1005
d70bf4f7
UB		 1006/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1007 * PNETID matching net_device)
1008 */
1009static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1010 struct smc_init_info *ini)
1011{
1012 int rc = SMC_CLC_DECL_NOSMCDDEV;
1013 struct smcd_dev *smcd;
1014 int i = 1;
839d696f 1015 u16 chid;
d70bf4f7
UB		 1016
1017 if (smcd_indicated(ini->smc_type_v1))
1018 rc = 0; /* already initialized for V1 */
1019 mutex_lock(&smcd_dev_list.mutex);
1020 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1021 if (smcd->going_away || smcd == ini->ism_dev[0])
1022 continue;
839d696f
KG		 1023 chid = smc_ism_get_chid(smcd);
1024 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1025 continue;
d70bf4f7
UB		 1026 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1027 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1028 ini->ism_dev[i] = smcd;
839d696f 1029 ini->ism_chid[i] = chid;
d70bf4f7
UB		 1030 ini->is_smcd = true;
1031 rc = 0;
1032 i++;
1033 if (i > SMC_MAX_ISM_DEVS)
1034 break;
1035 }
1036 }
1037 mutex_unlock(&smcd_dev_list.mutex);
1038 ini->ism_offered_cnt = i - 1;
1039 if (!ini->ism_dev[0] && !ini->ism_dev[1])
1040 ini->smcd_version = 0;
1041
1042 return rc;
1043}
1044
41349844
HW		 1045/* Check for VLAN ID and register it on ISM device just for CLC handshake */
1046static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
bc36d2fc 1047 struct smc_init_info *ini)
41349844 1048{
3fc64937 1049 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
7a62725a 1050 return SMC_CLC_DECL_ISMVLANERR;
41349844
HW		 1051 return 0;
1052}
1053
d70bf4f7
UB		 1054static int smc_find_proposal_devices(struct smc_sock *smc,
1055 struct smc_init_info *ini)
1056{
1057 int rc = 0;
1058
1059 /* check if there is an ism device available */
42042dbb
KG		 1060 if (!(ini->smcd_version & SMC_V1) ||
1061 smc_find_ism_device(smc, ini) ||
1062 smc_connect_ism_vlan_setup(smc, ini))
1063 ini->smcd_version &= ~SMC_V1;
1064 /* else ISM V1 is supported for this connection */
1065
1066 /* check if there is an rdma device available */
1067 if (!(ini->smcr_version & SMC_V1) ||
1068 smc_find_rdma_device(smc, ini))
1069 ini->smcr_version &= ~SMC_V1;
1070 /* else RDMA is supported for this connection */
1071
1072 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1073 ini->smcr_version & SMC_V1);
1074
1075 /* check if there is an ism v2 device available */
1076 if (!(ini->smcd_version & SMC_V2) ||
1077 !smc_ism_is_v2_capable() ||
1078 smc_find_ism_v2_device_clnt(smc, ini))
1079 ini->smcd_version &= ~SMC_V2;
1080
1081 /* check if there is an rdma v2 device available */
1082 ini->check_smcrv2 = true;
1083 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1084 if (!(ini->smcr_version & SMC_V2) ||
1085 smc->clcsock->sk->sk_family != AF_INET ||
1086 !smc_clc_ueid_count() ||
1087 smc_find_rdma_device(smc, ini))
1088 ini->smcr_version &= ~SMC_V2;
1089 ini->check_smcrv2 = false;
1090
1091 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1092 ini->smcr_version & SMC_V2);
d70bf4f7
UB		 1093
1094 /* if neither ISM nor RDMA are supported, fallback */
42042dbb 1095 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
d70bf4f7
UB		 1096 rc = SMC_CLC_DECL_NOSMCDEV;
1097
1098 return rc;
1099}
1100
41349844
HW		 1101/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1102 * used, the VLAN ID will be registered again during the connection setup.
1103 */
d70bf4f7 1104static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
bc36d2fc 1105 struct smc_init_info *ini)
41349844 1106{
d70bf4f7 1107 if (!smcd_indicated(ini->smc_type_v1))
41349844 1108 return 0;
3fc64937 1109 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
41349844
HW		 1110 return SMC_CLC_DECL_CNFERR;
1111 return 0;
1112}
1113
a7c9c5f4
UB		 1114#define SMC_CLC_MAX_ACCEPT_LEN \
1115 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
b81a5eb7 1116 sizeof(struct smc_clc_first_contact_ext) + \
a7c9c5f4
UB		 1117 sizeof(struct smc_clc_msg_trail))
1118
3b2dec26 1119/* CLC handshake during connect */
d70bf4f7 1120static int smc_connect_clc(struct smc_sock *smc,
a7c9c5f4 1121 struct smc_clc_msg_accept_confirm_v2 *aclc2,
bc36d2fc 1122 struct smc_init_info *ini)
3b2dec26
HW		 1123{
1124 int rc = 0;
a046d57d
UB		 1125
1126 /* do inband token exchange */
d70bf4f7 1127 rc = smc_clc_send_proposal(smc, ini);
3b2dec26
HW		 1128 if (rc)
1129 return rc;
a046d57d 1130 /* receive SMC Accept CLC message */
a7c9c5f4
UB		 1131 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
1132 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
3b2dec26
HW		 1133}
1134
b4ba4652
KG		 1135void smc_fill_gid_list(struct smc_link_group *lgr,
1136 struct smc_gidlist *gidlist,
1137 struct smc_ib_device *known_dev, u8 *known_gid)
e5c4744c
KG		 1138{
1139 struct smc_init_info *alt_ini = NULL;
1140
1141 memset(gidlist, 0, sizeof(*gidlist));
1142 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1143
1144 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1145 if (!alt_ini)
1146 goto out;
1147
1148 alt_ini->vlan_id = lgr->vlan_id;
1149 alt_ini->check_smcrv2 = true;
1150 alt_ini->smcrv2.saddr = lgr->saddr;
1151 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1152
1153 if (!alt_ini->smcrv2.ib_dev_v2)
1154 goto out;
1155
1156 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1157 SMC_GID_SIZE);
1158
1159out:
1160 kfree(alt_ini);
1161}
1162
1163static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1164 struct smc_clc_msg_accept_confirm *aclc,
1165 struct smc_init_info *ini)
1166{
1167 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1168 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1169 struct smc_clc_first_contact_ext *fce =
1170 (struct smc_clc_first_contact_ext *)
1171 (((u8 *)clc_v2) + sizeof(*clc_v2));
1172
1173 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1174 return 0;
1175
1176 if (fce->v2_direct) {
1177 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1178 ini->smcrv2.uses_gateway = false;
1179 } else {
1180 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr,
1181 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1182 ini->smcrv2.nexthop_mac,
1183 &ini->smcrv2.uses_gateway))
1184 return SMC_CLC_DECL_NOROUTE;
1185 if (!ini->smcrv2.uses_gateway) {
1186 /* mismatch: peer claims indirect, but its direct */
1187 return SMC_CLC_DECL_NOINDIRECT;
1188 }
1189 }
1190 return 0;
1191}
1192
3b2dec26
HW		 1193/* setup for RDMA connection of client */
1194static int smc_connect_rdma(struct smc_sock *smc,
1195 struct smc_clc_msg_accept_confirm *aclc,
bc36d2fc 1196 struct smc_init_info *ini)
3b2dec26 1197{
0fb0b02b 1198 int i, reason_code = 0;
3b2dec26 1199 struct smc_link *link;
e5c4744c 1200 u8 *eid = NULL;
a046d57d 1201
bc36d2fc 1202 ini->is_smcd = false;
3d9725a6 1203 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
f1eb02f9 1204 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
e5c4744c
KG		 1205 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1206 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1207 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
1208
1209 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1210 if (reason_code)
1211 return reason_code;
bc36d2fc 1212
72a36a8a 1213 mutex_lock(&smc_client_lgr_pending);
7a62725a
KG		 1214 reason_code = smc_conn_create(smc, ini);
1215 if (reason_code) {
72a36a8a
HW		 1216 mutex_unlock(&smc_client_lgr_pending);
1217 return reason_code;
0cfdd8f9 1218 }
a046d57d 1219
3b2dec26 1220 smc_conn_save_peer_info(smc, aclc);
cd6851f3 1221
5ac54d87 1222 if (ini->first_contact_local) {
0fb0b02b
KG		 1223 link = smc->conn.lnk;
1224 } else {
1225 /* set link that was assigned by server */
1226 link = NULL;
1227 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1228 struct smc_link *l = &smc->conn.lgr->lnk[i];
1229
3d9725a6
UB		 1230 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1231 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1232 SMC_GID_SIZE) &&
e5c4744c
KG		 1233 (aclc->hdr.version > SMC_V1 ||
1234 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1235 sizeof(l->peer_mac)))) {
0fb0b02b
KG		 1236 link = l;
1237 break;
1238 }
1239 }
c60a2cef
KG		 1240 if (!link) {
1241 reason_code = SMC_CLC_DECL_NOSRVLINK;
1242 goto connect_abort;
1243 }
64513d26 1244 smc_switch_link_and_count(&smc->conn, link);
0fb0b02b
KG		 1245 }
1246
3e034725 1247 /* create send buffer and rmb */
c60a2cef
KG		 1248 if (smc_buf_create(smc, false)) {
1249 reason_code = SMC_CLC_DECL_MEM;
1250 goto connect_abort;
1251 }
cd6851f3 1252
5ac54d87 1253 if (ini->first_contact_local)
e5c4744c 1254 smc_link_save_peer_info(link, aclc, ini);
bd4ad577 1255
c60a2cef
KG		 1256 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1257 reason_code = SMC_CLC_DECL_ERR_RTOK;
1258 goto connect_abort;
1259 }
bd4ad577 1260
46c28dbd
UB		 1261 smc_close_init(smc);
1262 smc_rx_init(smc);
1263
5ac54d87 1264 if (ini->first_contact_local) {
c60a2cef
KG		 1265 if (smc_ib_ready_link(link)) {
1266 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1267 goto connect_abort;
1268 }
652a1e41 1269 } else {
b8d19945
WG		 1270 /* reg sendbufs if they were vzalloced */
1271 if (smc->conn.sndbuf_desc->is_vm) {
1272 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1273 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1274 goto connect_abort;
1275 }
1276 }
c60a2cef 1277 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
b8d19945 1278 reason_code = SMC_CLC_DECL_ERR_REGBUF;
c60a2cef
KG		 1279 goto connect_abort;
1280 }
bd4ad577 1281 }
a046d57d 1282
e5c4744c
KG		 1283 if (aclc->hdr.version > SMC_V1) {
1284 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1285 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1286
1287 eid = clc_v2->r1.eid;
1288 if (ini->first_contact_local)
1289 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1290 link->smcibdev, link->gid);
1291 }
1292
a7c9c5f4 1293 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
e5c4744c 1294 aclc->hdr.version, eid, ini);
3b2dec26 1295 if (reason_code)
c60a2cef 1296 goto connect_abort;
3b2dec26
HW		 1297
1298 smc_tx_init(smc);
a046d57d 1299
5ac54d87 1300 if (ini->first_contact_local) {
9bf9abea 1301 /* QP confirmation over RoCE fabric */
0fb0b02b 1302 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
b9247544 1303 reason_code = smcr_clnt_conf_first_link(smc);
0fb0b02b 1304 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
3b2dec26 1305 if (reason_code)
c60a2cef 1306 goto connect_abort;
9bf9abea 1307 }
72a36a8a 1308 mutex_unlock(&smc_client_lgr_pending);
e6727f39 1309
a046d57d 1310 smc_copy_sock_settings_to_clc(smc);
50717a37 1311 smc->connect_nonblock = 0;
b38d7324
UB		 1312 if (smc->sk.sk_state == SMC_INIT)
1313 smc->sk.sk_state = SMC_ACTIVE;
a046d57d 1314
3b2dec26 1315 return 0;
c60a2cef 1316connect_abort:
8cf3f3e4 1317 smc_conn_abort(smc, ini->first_contact_local);
c60a2cef
KG		 1318 mutex_unlock(&smc_client_lgr_pending);
1319 smc->connect_nonblock = 0;
1320
1321 return reason_code;
3b2dec26 1322}
a046d57d 1323
a7c9c5f4
UB		 1324/* The server has chosen one of the proposed ISM devices for the communication.
1325 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1326 */
1327static int
1328smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1329 struct smc_init_info *ini)
1330{
1331 int i;
1332
1333 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
e5c4744c 1334 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
a7c9c5f4
UB		 1335 ini->ism_selected = i;
1336 return 0;
1337 }
1338 }
1339
1340 return -EPROTO;
1341}
1342
41349844
HW		 1343/* setup for ISM connection of client */
1344static int smc_connect_ism(struct smc_sock *smc,
1345 struct smc_clc_msg_accept_confirm *aclc,
bc36d2fc 1346 struct smc_init_info *ini)
41349844 1347{
fa086662 1348 u8 *eid = NULL;
41349844
HW		 1349 int rc = 0;
1350
bc36d2fc 1351 ini->is_smcd = true;
f1eb02f9 1352 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
bc36d2fc 1353
a7c9c5f4
UB		 1354 if (aclc->hdr.version == SMC_V2) {
1355 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1356 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1357
1358 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1359 if (rc)
1360 return rc;
1361 }
1362 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1363
72a36a8a
HW		 1364 /* there is only one lgr role for SMC-D; use server lock */
1365 mutex_lock(&smc_server_lgr_pending);
7a62725a
KG		 1366 rc = smc_conn_create(smc, ini);
1367 if (rc) {
72a36a8a 1368 mutex_unlock(&smc_server_lgr_pending);
7a62725a 1369 return rc;
72a36a8a 1370 }
41349844
HW		 1371
1372 /* Create send and receive buffers */
72b7f6c4 1373 rc = smc_buf_create(smc, true);
c60a2cef
KG		 1374 if (rc) {
1375 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1376 goto connect_abort;
1377 }
41349844
HW		 1378
1379 smc_conn_save_peer_info(smc, aclc);
1380 smc_close_init(smc);
1381 smc_rx_init(smc);
1382 smc_tx_init(smc);
1383
fa086662
KG		 1384 if (aclc->hdr.version > SMC_V1) {
1385 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1386 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1387
e5c4744c 1388 eid = clc_v2->d1.eid;
fa086662
KG		 1389 }
1390
a7c9c5f4 1391 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
e5c4744c 1392 aclc->hdr.version, eid, NULL);
41349844 1393 if (rc)
c60a2cef 1394 goto connect_abort;
72a36a8a 1395 mutex_unlock(&smc_server_lgr_pending);
41349844
HW		 1396
1397 smc_copy_sock_settings_to_clc(smc);
50717a37 1398 smc->connect_nonblock = 0;
41349844
HW		 1399 if (smc->sk.sk_state == SMC_INIT)
1400 smc->sk.sk_state = SMC_ACTIVE;
1401
1402 return 0;
c60a2cef 1403connect_abort:
8cf3f3e4 1404 smc_conn_abort(smc, ini->first_contact_local);
c60a2cef
KG		 1405 mutex_unlock(&smc_server_lgr_pending);
1406 smc->connect_nonblock = 0;
1407
1408 return rc;
41349844
HW		 1409}
1410
d70bf4f7
UB		 1411/* check if received accept type and version matches a proposed one */
1412static int smc_connect_check_aclc(struct smc_init_info *ini,
1413 struct smc_clc_msg_accept_confirm *aclc)
1414{
42042dbb
KG		 1415 if (aclc->hdr.typev1 != SMC_TYPE_R &&
1416 aclc->hdr.typev1 != SMC_TYPE_D)
d70bf4f7
UB		 1417 return SMC_CLC_DECL_MODEUNSUPP;
1418
42042dbb
KG		 1419 if (aclc->hdr.version >= SMC_V2) {
1420 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1421 !smcr_indicated(ini->smc_type_v2)) ||
1422 (aclc->hdr.typev1 == SMC_TYPE_D &&
1423 !smcd_indicated(ini->smc_type_v2)))
1424 return SMC_CLC_DECL_MODEUNSUPP;
1425 } else {
1426 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1427 !smcr_indicated(ini->smc_type_v1)) ||
1428 (aclc->hdr.typev1 == SMC_TYPE_D &&
1429 !smcd_indicated(ini->smc_type_v1)))
1430 return SMC_CLC_DECL_MODEUNSUPP;
1431 }
1432
d70bf4f7
UB		 1433 return 0;
1434}
1435
3b2dec26
HW		 1436/* perform steps before actually connecting */
1437static int __smc_connect(struct smc_sock *smc)
1438{
49407ae2 1439 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
a7c9c5f4
UB		 1440 struct smc_clc_msg_accept_confirm_v2 *aclc2;
1441 struct smc_clc_msg_accept_confirm *aclc;
3fc64937 1442 struct smc_init_info *ini = NULL;
a7c9c5f4 1443 u8 *buf = NULL;
3b2dec26 1444 int rc = 0;
a046d57d 1445
3b2dec26 1446 if (smc->use_fallback)
603cc149 1447 return smc_connect_fallback(smc, smc->fallback_rsn);
3b2dec26
HW		 1448
1449 /* if peer has not signalled SMC-capability, fall back */
1450 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
603cc149 1451 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
3b2dec26 1452
e8d726c8 1453 /* IPSec connections opt out of SMC optimizations */
3b2dec26 1454 if (using_ipsec(smc))
e8d726c8
UB		 1455 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1456 version);
3b2dec26 1457
3fc64937
UB		 1458 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1459 if (!ini)
e8d726c8
UB		 1460 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1461 version);
3fc64937 1462
42042dbb
KG		 1463 ini->smcd_version = SMC_V1 | SMC_V2;
1464 ini->smcr_version = SMC_V1 | SMC_V2;
d70bf4f7 1465 ini->smc_type_v1 = SMC_TYPE_B;
42042dbb 1466 ini->smc_type_v2 = SMC_TYPE_B;
d70bf4f7 1467
fba7e8ef 1468 /* get vlan id from IP device */
3fc64937 1469 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
d70bf4f7 1470 ini->smcd_version &= ~SMC_V1;
42042dbb 1471 ini->smcr_version = 0;
d70bf4f7
UB		 1472 ini->smc_type_v1 = SMC_TYPE_N;
1473 if (!ini->smcd_version) {
1474 rc = SMC_CLC_DECL_GETVLANERR;
1475 goto fallback;
1476 }
41349844
HW		 1477 }
1478
d70bf4f7
UB		 1479 rc = smc_find_proposal_devices(smc, ini);
1480 if (rc)
1481 goto fallback;
3b2dec26 1482
a7c9c5f4
UB		 1483 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1484 if (!buf) {
1485 rc = SMC_CLC_DECL_MEM;
1486 goto fallback;
1487 }
1488 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1489 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1490
3b2dec26 1491 /* perform CLC handshake */
a7c9c5f4 1492 rc = smc_connect_clc(smc, aclc2, ini);
1ce22047
W		 1493 if (rc) {
1494 /* -EAGAIN on timeout, see tcp_recvmsg() */
1495 if (rc == -EAGAIN) {
1496 rc = -ETIMEDOUT;
1497 smc->sk.sk_err = ETIMEDOUT;
1498 }
d70bf4f7 1499 goto vlan_cleanup;
1ce22047 1500 }
d70bf4f7
UB		 1501
1502 /* check if smc modes and versions of CLC proposal and accept match */
a7c9c5f4 1503 rc = smc_connect_check_aclc(ini, aclc);
0530bd6e 1504 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
d70bf4f7
UB		 1505 if (rc)
1506 goto vlan_cleanup;
3b2dec26 1507
41349844 1508 /* depending on previous steps, connect using rdma or ism */
42042dbb
KG		 1509 if (aclc->hdr.typev1 == SMC_TYPE_R) {
1510 ini->smcr_version = version;
a7c9c5f4 1511 rc = smc_connect_rdma(smc, aclc, ini);
42042dbb
KG		 1512 } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1513 ini->smcd_version = version;
a7c9c5f4 1514 rc = smc_connect_ism(smc, aclc, ini);
42042dbb 1515 }
d70bf4f7
UB		 1516 if (rc)
1517 goto vlan_cleanup;
3b2dec26 1518
194730a9 1519 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
d70bf4f7 1520 smc_connect_ism_vlan_cleanup(smc, ini);
a7c9c5f4 1521 kfree(buf);
3fc64937 1522 kfree(ini);
3b2dec26 1523 return 0;
d70bf4f7
UB		 1524
1525vlan_cleanup:
1526 smc_connect_ism_vlan_cleanup(smc, ini);
a7c9c5f4 1527 kfree(buf);
d70bf4f7
UB		 1528fallback:
1529 kfree(ini);
e8d726c8 1530 return smc_connect_decline_fallback(smc, rc, version);
a046d57d
UB		 1531}
1532
24ac3a08
UB		 1533static void smc_connect_work(struct work_struct *work)
1534{
1535 struct smc_sock *smc = container_of(work, struct smc_sock,
1536 connect_work);
50717a37
UB		 1537 long timeo = smc->sk.sk_sndtimeo;
1538 int rc = 0;
24ac3a08 1539
50717a37
UB		 1540 if (!timeo)
1541 timeo = MAX_SCHEDULE_TIMEOUT;
1542 lock_sock(smc->clcsock->sk);
24ac3a08
UB		 1543 if (smc->clcsock->sk->sk_err) {
1544 smc->sk.sk_err = smc->clcsock->sk->sk_err;
50717a37 1545 } else if ((1 << smc->clcsock->sk->sk_state) &
f3a3a0fe 1546 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
50717a37
UB		 1547 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1548 if ((rc == -EPIPE) &&
1549 ((1 << smc->clcsock->sk->sk_state) &
1550 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1551 rc = 0;
24ac3a08 1552 }
50717a37
UB		 1553 release_sock(smc->clcsock->sk);
1554 lock_sock(&smc->sk);
1555 if (rc != 0 || smc->sk.sk_err) {
1556 smc->sk.sk_state = SMC_CLOSED;
1557 if (rc == -EPIPE || rc == -EAGAIN)
1558 smc->sk.sk_err = EPIPE;
4e2e65e2 1559 else if (rc == -ECONNREFUSED)
1560 smc->sk.sk_err = ECONNREFUSED;
50717a37
UB		 1561 else if (signal_pending(current))
1562 smc->sk.sk_err = -sock_intr_errno(timeo);
6d6dd528 1563 sock_put(&smc->sk); /* passive closing */
24ac3a08
UB		 1564 goto out;
1565 }
1566
1567 rc = __smc_connect(smc);
1568 if (rc < 0)
1569 smc->sk.sk_err = -rc;
1570
1571out:
07603b23
UB		 1572 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1573 if (smc->sk.sk_err) {
1574 smc->sk.sk_state_change(&smc->sk);
1575 } else { /* allow polling before and after fallback decision */
1576 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1577 smc->sk.sk_write_space(&smc->sk);
1578 }
1579 }
24ac3a08
UB		 1580 release_sock(&smc->sk);
1581}
1582
ac713874
UB		 1583static int smc_connect(struct socket *sock, struct sockaddr *addr,
1584 int alen, int flags)
1585{
1586 struct sock *sk = sock->sk;
1587 struct smc_sock *smc;
1588 int rc = -EINVAL;
1589
1590 smc = smc_sk(sk);
1591
1592 /* separate smc parameter checking to be safe */
1593 if (alen < sizeof(addr->sa_family))
1594 goto out_err;
aaa4d33f 1595 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
ac713874
UB		 1596 goto out_err;
1597
1598 lock_sock(sk);
3aba1030
GW		 1599 switch (sock->state) {
1600 default:
1601 rc = -EINVAL;
1602 goto out;
1603 case SS_CONNECTED:
1604 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1605 goto out;
1606 case SS_CONNECTING:
1607 if (sk->sk_state == SMC_ACTIVE)
1608 goto connected;
1609 break;
1610 case SS_UNCONNECTED:
1611 sock->state = SS_CONNECTING;
1612 break;
1613 }
1614
ac713874
UB		 1615 switch (sk->sk_state) {
1616 default:
1617 goto out;
3aba1030
GW		 1618 case SMC_CLOSED:
1619 rc = sock_error(sk) ? : -ECONNABORTED;
1620 sock->state = SS_UNCONNECTED;
1621 goto out;
ac713874
UB		 1622 case SMC_ACTIVE:
1623 rc = -EISCONN;
1624 goto out;
1625 case SMC_INIT:
ac713874
UB		 1626 break;
1627 }
1628
1629 smc_copy_sock_settings_to_clc(smc);
c5c1cc9c 1630 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
50717a37
UB		 1631 if (smc->connect_nonblock) {
1632 rc = -EALREADY;
1633 goto out;
1634 }
1635 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1636 if (rc && rc != -EINPROGRESS)
1637 goto out;
301428ea 1638
3aba1030
GW		 1639 if (smc->use_fallback) {
1640 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
86434744 1641 goto out;
3aba1030 1642 }
75c1edf2 1643 sock_hold(&smc->sk); /* sock put in passive closing */
24ac3a08 1644 if (flags & O_NONBLOCK) {
22ef473d 1645 if (queue_work(smc_hs_wq, &smc->connect_work))
50717a37 1646 smc->connect_nonblock = 1;
24ac3a08 1647 rc = -EINPROGRESS;
3aba1030 1648 goto out;
24ac3a08 1649 } else {
24ac3a08
UB		 1650 rc = __smc_connect(smc);
1651 if (rc < 0)
1652 goto out;
24ac3a08 1653 }
ac713874 1654
3aba1030
GW		 1655connected:
1656 rc = 0;
1657 sock->state = SS_CONNECTED;
ac713874
UB		 1658out:
1659 release_sock(sk);
1660out_err:
1661 return rc;
1662}
1663
1664static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1665{
3163c507
UB		 1666 struct socket *new_clcsock = NULL;
1667 struct sock *lsk = &lsmc->sk;
ac713874 1668 struct sock *new_sk;
78abe3d0 1669 int rc = -EINVAL;
ac713874 1670
3163c507 1671 release_sock(lsk);
aaa4d33f 1672 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
ac713874
UB		 1673 if (!new_sk) {
1674 rc = -ENOMEM;
3163c507 1675 lsk->sk_err = ENOMEM;
ac713874 1676 *new_smc = NULL;
3163c507 1677 lock_sock(lsk);
ac713874
UB		 1678 goto out;
1679 }
1680 *new_smc = smc_sk(new_sk);
1681
78abe3d0
MJ		 1682 mutex_lock(&lsmc->clcsock_release_lock);
1683 if (lsmc->clcsock)
a60a2b1e 1684 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
78abe3d0 1685 mutex_unlock(&lsmc->clcsock_release_lock);
3163c507 1686 lock_sock(lsk);
a60a2b1e 1687 if (rc < 0 && rc != -EAGAIN)
3163c507 1688 lsk->sk_err = -rc;
35a6b178 1689 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
f61bca58 1690 new_sk->sk_prot->unhash(new_sk);
a046d57d
UB		 1691 if (new_clcsock)
1692 sock_release(new_clcsock);
1693 new_sk->sk_state = SMC_CLOSED;
1694 sock_set_flag(new_sk, SOCK_DEAD);
51f1de79 1695 sock_put(new_sk); /* final */
ac713874
UB		 1696 *new_smc = NULL;
1697 goto out;
1698 }
1699
a60a2b1e
UB		 1700 /* new clcsock has inherited the smc listen-specific sk_data_ready
1701 * function; switch it back to the original sk_data_ready function
1702 */
1703 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
97b9af7a
WG		 1704
1705 /* if new clcsock has also inherited the fallback-specific callback
1706 * functions, switch them back to the original ones.
1707 */
1708 if (lsmc->use_fallback) {
1709 if (lsmc->clcsk_state_change)
1710 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1711 if (lsmc->clcsk_write_space)
1712 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1713 if (lsmc->clcsk_error_report)
1714 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1715 }
1716
ac713874
UB		 1717 (*new_smc)->clcsock = new_clcsock;
1718out:
1719 return rc;
1720}
1721
a046d57d
UB		 1722/* add a just created sock to the accept queue of the listen sock as
1723 * candidate for a following socket accept call from user space
1724 */
1725static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1726{
1727 struct smc_sock *par = smc_sk(parent);
1728
51f1de79 1729 sock_hold(sk); /* sock_put in smc_accept_unlink () */
a046d57d
UB		 1730 spin_lock(&par->accept_q_lock);
1731 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1732 spin_unlock(&par->accept_q_lock);
1733 sk_acceptq_added(parent);
1734}
1735
1736/* remove a socket from the accept queue of its parental listening socket */
1737static void smc_accept_unlink(struct sock *sk)
1738{
1739 struct smc_sock *par = smc_sk(sk)->listen_smc;
1740
1741 spin_lock(&par->accept_q_lock);
1742 list_del_init(&smc_sk(sk)->accept_q);
1743 spin_unlock(&par->accept_q_lock);
1744 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
51f1de79 1745 sock_put(sk); /* sock_hold in smc_accept_enqueue */
a046d57d
UB		 1746}
1747
1748/* remove a sock from the accept queue to bind it to a new socket created
1749 * for a socket accept call from user space
1750 */
b38d7324
UB		 1751struct sock *smc_accept_dequeue(struct sock *parent,
1752 struct socket *new_sock)
a046d57d
UB		 1753{
1754 struct smc_sock *isk, *n;
1755 struct sock *new_sk;
1756
1757 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1758 new_sk = (struct sock *)isk;
1759
1760 smc_accept_unlink(new_sk);
1761 if (new_sk->sk_state == SMC_CLOSED) {
f61bca58 1762 new_sk->sk_prot->unhash(new_sk);
127f4970
UB		 1763 if (isk->clcsock) {
1764 sock_release(isk->clcsock);
1765 isk->clcsock = NULL;
1766 }
51f1de79 1767 sock_put(new_sk); /* final */
a046d57d
UB		 1768 continue;
1769 }
07603b23 1770 if (new_sock) {
a046d57d 1771 sock_graft(new_sk, new_sock);
3aba1030 1772 new_sock->state = SS_CONNECTED;
07603b23
UB		 1773 if (isk->use_fallback) {
1774 smc_sk(new_sk)->clcsock->file = new_sock->file;
1775 isk->clcsock->file->private_data = isk->clcsock;
1776 }
1777 }
a046d57d
UB		 1778 return new_sk;
1779 }
1780 return NULL;
1781}
1782
1783/* clean up for a created but never accepted sock */
b38d7324 1784void smc_close_non_accepted(struct sock *sk)
a046d57d
UB		 1785{
1786 struct smc_sock *smc = smc_sk(sk);
1787
81cf4f47 1788 sock_hold(sk); /* sock_put below */
b38d7324
UB		 1789 lock_sock(sk);
1790 if (!sk->sk_lingertime)
1791 /* wait for peer closing */
1792 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
39f41f36 1793 __smc_release(smc);
b38d7324 1794 release_sock(sk);
81cf4f47 1795 sock_put(sk); /* sock_hold above */
51f1de79 1796 sock_put(sk); /* final sock_put */
a046d57d
UB		 1797}
1798
b9247544 1799static int smcr_serv_conf_first_link(struct smc_sock *smc)
9bf9abea 1800{
387707fd 1801 struct smc_link *link = smc->conn.lnk;
4667bb4a 1802 struct smc_llc_qentry *qentry;
9bf9abea
UB		 1803 int rc;
1804
b8d19945
WG		 1805 /* reg the sndbuf if it was vzalloced*/
1806 if (smc->conn.sndbuf_desc->is_vm) {
1807 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1808 return SMC_CLC_DECL_ERR_REGBUF;
1809 }
1810
1811 /* reg the rmb */
1812 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1813 return SMC_CLC_DECL_ERR_REGBUF;
652a1e41 1814
9bf9abea 1815 /* send CONFIRM LINK request to client over the RoCE fabric */
947541f3 1816 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
9bf9abea 1817 if (rc < 0)
603cc149 1818 return SMC_CLC_DECL_TIMEOUT_CL;
9bf9abea
UB		 1819
1820 /* receive CONFIRM LINK response from client over the RoCE fabric */
4667bb4a
KG		 1821 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1822 SMC_LLC_CONFIRM_LINK);
1823 if (!qentry) {
9bf9abea
UB		 1824 struct smc_clc_msg_decline dclc;
1825
1826 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
2b59f58e 1827 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
9ed28556 1828 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
9bf9abea 1829 }
649758ff 1830 smc_llc_save_peer_uid(qentry);
4667bb4a
KG		 1831 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1832 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1833 if (rc)
75d320d6
KG		 1834 return SMC_CLC_DECL_RMBE_EC;
1835
4667bb4a
KG		 1836 /* confirm_rkey is implicit on 1st contact */
1837 smc->conn.rmb_desc->is_conf_rkey = true;
52bedf37 1838
00a049cf 1839 smc_llc_link_active(link);
0a99be43 1840 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
52bedf37 1841
d1fabc68 1842 down_write(&link->lgr->llc_conf_mutex);
4667bb4a 1843 /* initial contact - try to establish second link */
b4ba4652 1844 smc_llc_srv_add_link(link, NULL);
d1fabc68 1845 up_write(&link->lgr->llc_conf_mutex);
75d320d6 1846 return 0;
9bf9abea
UB		 1847}
1848
3b2dec26
HW		 1849/* listen worker: finish */
1850static void smc_listen_out(struct smc_sock *new_smc)
a046d57d 1851{
a046d57d 1852 struct smc_sock *lsmc = new_smc->listen_smc;
a046d57d 1853 struct sock *newsmcsk = &new_smc->sk;
a046d57d 1854
8270d9c2
W		 1855 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1856 atomic_dec(&lsmc->queued_smc_hs);
1857
3b2dec26 1858 if (lsmc->sk.sk_state == SMC_LISTEN) {
fd57770d 1859 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
3b2dec26 1860 smc_accept_enqueue(&lsmc->sk, newsmcsk);
fd57770d 1861 release_sock(&lsmc->sk);
3b2dec26
HW		 1862 } else { /* no longer listening */
1863 smc_close_non_accepted(newsmcsk);
c5c1cc9c
UB		 1864 }
1865
3b2dec26
HW		 1866 /* Wake up accept */
1867 lsmc->sk.sk_data_ready(&lsmc->sk);
1868 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
1869}
a046d57d 1870
3b2dec26
HW		 1871/* listen worker: finish in state connected */
1872static void smc_listen_out_connected(struct smc_sock *new_smc)
1873{
1874 struct sock *newsmcsk = &new_smc->sk;
a046d57d 1875
3b2dec26
HW		 1876 if (newsmcsk->sk_state == SMC_INIT)
1877 newsmcsk->sk_state = SMC_ACTIVE;
1878
1879 smc_listen_out(new_smc);
1880}
1881
1882/* listen worker: finish in error state */
1883static void smc_listen_out_err(struct smc_sock *new_smc)
1884{
1885 struct sock *newsmcsk = &new_smc->sk;
194730a9 1886 struct net *net = sock_net(newsmcsk);
3b2dec26 1887
194730a9 1888 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
3b2dec26
HW		 1889 if (newsmcsk->sk_state == SMC_INIT)
1890 sock_put(&new_smc->sk); /* passive closing */
1891 newsmcsk->sk_state = SMC_CLOSED;
3b2dec26
HW		 1892
1893 smc_listen_out(new_smc);
1894}
1895
1896/* listen worker: decline and fall back if possible */
1897static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
4a9baf45 1898 int local_first, u8 version)
3b2dec26
HW		 1899{
1900 /* RDMA setup failed, switch back to TCP */
8cf3f3e4 1901 smc_conn_abort(new_smc, local_first);
c0bf3d8a
WG		 1902 if (reason_code < 0 ||
1903 smc_switch_to_fallback(new_smc, reason_code)) {
1904 /* error, no fallback possible */
3b2dec26
HW		 1905 smc_listen_out_err(new_smc);
1906 return;
1907 }
603cc149 1908 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
e8d726c8 1909 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
3b2dec26
HW		 1910 smc_listen_out_err(new_smc);
1911 return;
1912 }
a046d57d 1913 }
3b2dec26
HW		 1914 smc_listen_out_connected(new_smc);
1915}
1916
5c21c4cc
UB		 1917/* listen worker: version checking */
1918static int smc_listen_v2_check(struct smc_sock *new_smc,
1919 struct smc_clc_msg_proposal *pclc,
1920 struct smc_init_info *ini)
1921{
1922 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1923 struct smc_clc_v2_extension *pclc_v2_ext;
3752404a 1924 int rc = SMC_CLC_DECL_PEERNOSMC;
5c21c4cc
UB		 1925
1926 ini->smc_type_v1 = pclc->hdr.typev1;
1927 ini->smc_type_v2 = pclc->hdr.typev2;
e49300a6
KG		 1928 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1929 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1930 if (pclc->hdr.version > SMC_V1) {
1931 if (smcd_indicated(ini->smc_type_v2))
1932 ini->smcd_version |= SMC_V2;
1933 if (smcr_indicated(ini->smc_type_v2))
1934 ini->smcr_version |= SMC_V2;
3752404a 1935 }
e49300a6
KG		 1936 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1937 rc = SMC_CLC_DECL_PEERNOSMC;
5c21c4cc
UB		 1938 goto out;
1939 }
1940 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1941 if (!pclc_v2_ext) {
1942 ini->smcd_version &= ~SMC_V2;
e49300a6 1943 ini->smcr_version &= ~SMC_V2;
3752404a 1944 rc = SMC_CLC_DECL_NOV2EXT;
5c21c4cc
UB		 1945 goto out;
1946 }
1947 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
e49300a6
KG		 1948 if (ini->smcd_version & SMC_V2) {
1949 if (!smc_ism_is_v2_capable()) {
1950 ini->smcd_version &= ~SMC_V2;
1951 rc = SMC_CLC_DECL_NOISM2SUPP;
1952 } else if (!pclc_smcd_v2_ext) {
1953 ini->smcd_version &= ~SMC_V2;
1954 rc = SMC_CLC_DECL_NOV2DEXT;
1955 } else if (!pclc_v2_ext->hdr.eid_cnt &&
1956 !pclc_v2_ext->hdr.flag.seid) {
1957 ini->smcd_version &= ~SMC_V2;
1958 rc = SMC_CLC_DECL_NOUEID;
1959 }
1960 }
1961 if (ini->smcr_version & SMC_V2) {
1962 if (!pclc_v2_ext->hdr.eid_cnt) {
1963 ini->smcr_version &= ~SMC_V2;
1964 rc = SMC_CLC_DECL_NOUEID;
1965 }
3752404a 1966 }
5c21c4cc
UB		 1967
1968out:
e49300a6 1969 if (!ini->smcd_version && !ini->smcr_version)
3752404a 1970 return rc;
5c21c4cc
UB		 1971
1972 return 0;
1973}
1974
3b2dec26 1975/* listen worker: check prefixes */
59886697 1976static int smc_listen_prfx_check(struct smc_sock *new_smc,
3b2dec26
HW		 1977 struct smc_clc_msg_proposal *pclc)
1978{
1979 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1980 struct socket *newclcsock = new_smc->clcsock;
a046d57d 1981
5c21c4cc
UB		 1982 if (pclc->hdr.typev1 == SMC_TYPE_N)
1983 return 0;
e7b7a64a 1984 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
3b2dec26 1985 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
59886697 1986 return SMC_CLC_DECL_DIFFPREFIX;
c246d942 1987
3b2dec26
HW		 1988 return 0;
1989}
a046d57d 1990
3b2dec26
HW		 1991/* listen worker: initialize connection and buffers */
1992static int smc_listen_rdma_init(struct smc_sock *new_smc,
7a62725a 1993 struct smc_init_info *ini)
3b2dec26 1994{
7a62725a
KG		 1995 int rc;
1996
0cfdd8f9 1997 /* allocate connection / link group */
7a62725a
KG		 1998 rc = smc_conn_create(new_smc, ini);
1999 if (rc)
2000 return rc;
a046d57d 2001
3e034725 2002 /* create send buffer and rmb */
c6ba7c9b 2003 if (smc_buf_create(new_smc, false))
3b2dec26 2004 return SMC_CLC_DECL_MEM;
a046d57d 2005
3b2dec26
HW		 2006 return 0;
2007}
2008
41349844
HW		 2009/* listen worker: initialize connection and buffers for SMC-D */
2010static int smc_listen_ism_init(struct smc_sock *new_smc,
7a62725a 2011 struct smc_init_info *ini)
41349844 2012{
7a62725a 2013 int rc;
41349844 2014
7a62725a
KG		 2015 rc = smc_conn_create(new_smc, ini);
2016 if (rc)
2017 return rc;
41349844 2018
41349844 2019 /* Create send and receive buffers */
72b7f6c4
KG		 2020 rc = smc_buf_create(new_smc, true);
2021 if (rc) {
8cf3f3e4 2022 smc_conn_abort(new_smc, ini->first_contact_local);
72b7f6c4
KG		 2023 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2024 SMC_CLC_DECL_MEM;
41349844
HW		 2025 }
2026
2027 return 0;
2028}
2029
5c21c4cc
UB		 2030static bool smc_is_already_selected(struct smcd_dev *smcd,
2031 struct smc_init_info *ini,
2032 int matches)
2033{
2034 int i;
2035
2036 for (i = 0; i < matches; i++)
2037 if (smcd == ini->ism_dev[i])
2038 return true;
2039
2040 return false;
2041}
2042
2043/* check for ISM devices matching proposed ISM devices */
2044static void smc_check_ism_v2_match(struct smc_init_info *ini,
2045 u16 proposed_chid, u64 proposed_gid,
2046 unsigned int *matches)
2047{
2048 struct smcd_dev *smcd;
2049
2050 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2051 if (smcd->going_away)
2052 continue;
2053 if (smc_is_already_selected(smcd, ini, *matches))
2054 continue;
2055 if (smc_ism_get_chid(smcd) == proposed_chid &&
2056 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2057 ini->ism_peer_gid[*matches] = proposed_gid;
2058 ini->ism_dev[*matches] = smcd;
2059 (*matches)++;
2060 break;
2061 }
2062 }
2063}
2064
3752404a
KG		 2065static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2066{
2067 if (!ini->rc)
2068 ini->rc = rc;
2069}
2070
5c21c4cc
UB		 2071static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2072 struct smc_clc_msg_proposal *pclc,
2073 struct smc_init_info *ini)
2074{
2075 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2076 struct smc_clc_v2_extension *smc_v2_ext;
2077 struct smc_clc_msg_smcd *pclc_smcd;
2078 unsigned int matches = 0;
f29fa003 2079 u8 smcd_version;
5c21c4cc 2080 u8 *eid = NULL;
3752404a 2081 int i, rc;
5c21c4cc
UB		 2082
2083 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
f29fa003 2084 goto not_found;
5c21c4cc
UB		 2085
2086 pclc_smcd = smc_get_clc_msg_smcd(pclc);
2087 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2088 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
5c21c4cc
UB		 2089
2090 mutex_lock(&smcd_dev_list.mutex);
2091 if (pclc_smcd->ism.chid)
2092 /* check for ISM device matching proposed native ISM device */
2093 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2094 ntohll(pclc_smcd->ism.gid), &matches);
2095 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
2096 /* check for ISM devices matching proposed non-native ISM
2097 * devices
2098 */
2099 smc_check_ism_v2_match(ini,
2100 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
2101 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
2102 &matches);
2103 }
2104 mutex_unlock(&smcd_dev_list.mutex);
2105
e49300a6
KG		 2106 if (!ini->ism_dev[0]) {
2107 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
fa086662 2108 goto not_found;
e49300a6 2109 }
fa086662 2110
11a26c59 2111 smc_ism_get_system_eid(&eid);
fa086662
KG		 2112 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2113 smcd_v2_ext->system_eid, eid))
5c21c4cc 2114 goto not_found;
5c21c4cc
UB		 2115
2116 /* separate - outside the smcd_dev_list.lock */
f29fa003 2117 smcd_version = ini->smcd_version;
5c21c4cc
UB		 2118 for (i = 0; i < matches; i++) {
2119 ini->smcd_version = SMC_V2;
2120 ini->is_smcd = true;
2121 ini->ism_selected = i;
3752404a
KG		 2122 rc = smc_listen_ism_init(new_smc, ini);
2123 if (rc) {
2124 smc_find_ism_store_rc(rc, ini);
5c21c4cc
UB		 2125 /* try next active ISM device */
2126 continue;
3752404a 2127 }
5c21c4cc
UB		 2128 return; /* matching and usable V2 ISM device found */
2129 }
f29fa003
KG		 2130 /* no V2 ISM device could be initialized */
2131 ini->smcd_version = smcd_version; /* restore original value */
fa086662 2132 ini->negotiated_eid[0] = 0;
5c21c4cc
UB		 2133
2134not_found:
2135 ini->smcd_version &= ~SMC_V2;
2136 ini->ism_dev[0] = NULL;
2137 ini->is_smcd = false;
2138}
2139
2140static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2141 struct smc_clc_msg_proposal *pclc,
2142 struct smc_init_info *ini)
7affc809
UB		 2143{
2144 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
3752404a 2145 int rc = 0;
7affc809 2146
5c21c4cc
UB		 2147 /* check if ISM V1 is available */
2148 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
7affc809
UB		 2149 goto not_found;
2150 ini->is_smcd = true; /* prepare ISM check */
8c3dca34 2151 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
3752404a
KG		 2152 rc = smc_find_ism_device(new_smc, ini);
2153 if (rc)
7affc809 2154 goto not_found;
5c21c4cc 2155 ini->ism_selected = 0;
3752404a
KG		 2156 rc = smc_listen_ism_init(new_smc, ini);
2157 if (!rc)
5c21c4cc 2158 return; /* V1 ISM device found */
7affc809
UB		 2159
2160not_found:
3752404a 2161 smc_find_ism_store_rc(rc, ini);
e49300a6 2162 ini->smcd_version &= ~SMC_V1;
3fc64937 2163 ini->ism_dev[0] = NULL;
7affc809
UB		 2164 ini->is_smcd = false;
2165}
2166
3b2dec26 2167/* listen worker: register buffers */
5ac54d87 2168static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
3b2dec26 2169{
b9247544 2170 struct smc_connection *conn = &new_smc->conn;
46c28dbd 2171
5ac54d87 2172 if (!local_first) {
b8d19945
WG		 2173 /* reg sendbufs if they were vzalloced */
2174 if (conn->sndbuf_desc->is_vm) {
2175 if (smcr_lgr_reg_sndbufs(conn->lnk,
2176 conn->sndbuf_desc))
2177 return SMC_CLC_DECL_ERR_REGBUF;
2178 }
7562a13d 2179 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
b8d19945 2180 return SMC_CLC_DECL_ERR_REGBUF;
652a1e41
UB		 2181 }
2182
3b2dec26
HW		 2183 return 0;
2184}
2185
9029ac03 2186static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2187 struct smc_clc_msg_proposal *pclc,
2188 struct smc_init_info *ini)
e49300a6
KG		 2189{
2190 struct smc_clc_v2_extension *smc_v2_ext;
2191 u8 smcr_version;
9029ac03 2192 int rc;
e49300a6
KG		 2193
2194 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2195 goto not_found;
2196
2197 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2198 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2199 goto not_found;
2200
2201 /* prepare RDMA check */
2202 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2203 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2204 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2205 ini->check_smcrv2 = true;
2206 ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2207 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2208 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2209 rc = smc_find_rdma_device(new_smc, ini);
9029ac03 2210 if (rc) {
2211 smc_find_ism_store_rc(rc, ini);
e49300a6 2212 goto not_found;
9029ac03 2213 }
e49300a6
KG		 2214 if (!ini->smcrv2.uses_gateway)
2215 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2216
2217 smcr_version = ini->smcr_version;
2218 ini->smcr_version = SMC_V2;
2219 rc = smc_listen_rdma_init(new_smc, ini);
9029ac03 2220 if (!rc)
2221 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2222 if (!rc)
2223 return;
2224 ini->smcr_version = smcr_version;
2225 smc_find_ism_store_rc(rc, ini);
e49300a6
KG		 2226
2227not_found:
2228 ini->smcr_version &= ~SMC_V2;
b3b1a175 2229 ini->smcrv2.ib_dev_v2 = NULL;
e49300a6
KG		 2230 ini->check_smcrv2 = false;
2231}
2232
5c21c4cc
UB		 2233static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2234 struct smc_clc_msg_proposal *pclc,
2235 struct smc_init_info *ini)
7affc809
UB		 2236{
2237 int rc;
2238
e49300a6 2239 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
7affc809
UB		 2240 return SMC_CLC_DECL_NOSMCDEV;
2241
2242 /* prepare RDMA check */
e49300a6
KG		 2243 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2244 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2245 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
7affc809
UB		 2246 rc = smc_find_rdma_device(new_smc, ini);
2247 if (rc) {
2248 /* no RDMA device found */
e49300a6 2249 return SMC_CLC_DECL_NOSMCDEV;
7affc809
UB		 2250 }
2251 rc = smc_listen_rdma_init(new_smc, ini);
2252 if (rc)
2253 return rc;
2254 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2255}
2256
2257/* determine the local device matching to proposal */
2258static int smc_listen_find_device(struct smc_sock *new_smc,
2259 struct smc_clc_msg_proposal *pclc,
2260 struct smc_init_info *ini)
2261{
e49300a6 2262 int prfx_rc;
5c21c4cc
UB		 2263
2264 /* check for ISM device matching V2 proposed device */
2265 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2266 if (ini->ism_dev[0])
7affc809 2267 return 0;
5c21c4cc 2268
e49300a6
KG		 2269 /* check for matching IP prefix and subnet length (V1) */
2270 prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2271 if (prfx_rc)
2272 smc_find_ism_store_rc(prfx_rc, ini);
5c21c4cc
UB		 2273
2274 /* get vlan id from IP device */
2275 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
3752404a 2276 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
5c21c4cc
UB		 2277
2278 /* check for ISM device matching V1 proposed device */
e49300a6
KG		 2279 if (!prfx_rc)
2280 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
5c21c4cc
UB		 2281 if (ini->ism_dev[0])
2282 return 0;
2283
e49300a6
KG		 2284 if (!smcr_indicated(pclc->hdr.typev1) &&
2285 !smcr_indicated(pclc->hdr.typev2))
3752404a
KG		 2286 /* skip RDMA and decline */
2287 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
7affc809 2288
e49300a6 2289 /* check if RDMA V2 is available */
9029ac03 2290 smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2291 if (ini->smcrv2.ib_dev_v2)
e49300a6 2292 return 0;
3752404a 2293
e49300a6
KG		 2294 /* check if RDMA V1 is available */
2295 if (!prfx_rc) {
9029ac03 2296 int rc;
2297
e49300a6
KG		 2298 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2299 smc_find_ism_store_rc(rc, ini);
2300 return (!rc) ? 0 : ini->rc;
2301 }
2302 return SMC_CLC_DECL_NOSMCDEV;
7affc809
UB		 2303}
2304
3b2dec26 2305/* listen worker: finish RDMA setup */
1ca52fcf
UB		 2306static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2307 struct smc_clc_msg_accept_confirm *cclc,
e49300a6
KG		 2308 bool local_first,
2309 struct smc_init_info *ini)
3b2dec26 2310{
387707fd 2311 struct smc_link *link = new_smc->conn.lnk;
3b2dec26 2312 int reason_code = 0;
a046d57d 2313
5ac54d87 2314 if (local_first)
e49300a6 2315 smc_link_save_peer_info(link, cclc, ini);
a046d57d 2316
0c881ada
UB		 2317 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2318 return SMC_CLC_DECL_ERR_RTOK;
bd4ad577 2319
5ac54d87 2320 if (local_first) {
0c881ada
UB		 2321 if (smc_ib_ready_link(link))
2322 return SMC_CLC_DECL_ERR_RDYLNK;
9bf9abea 2323 /* QP confirmation over RoCE fabric */
4667bb4a 2324 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
b9247544 2325 reason_code = smcr_serv_conf_first_link(new_smc);
4667bb4a 2326 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
bd4ad577 2327 }
1ca52fcf 2328 return reason_code;
3b2dec26 2329}
e6727f39 2330
7affc809 2331/* setup for connection of server */
3b2dec26
HW		 2332static void smc_listen_work(struct work_struct *work)
2333{
2334 struct smc_sock *new_smc = container_of(work, struct smc_sock,
2335 smc_listen_work);
2336 struct socket *newclcsock = new_smc->clcsock;
a7c9c5f4 2337 struct smc_clc_msg_accept_confirm *cclc;
6bb14e48 2338 struct smc_clc_msg_proposal_area *buf;
3b2dec26 2339 struct smc_clc_msg_proposal *pclc;
3fc64937 2340 struct smc_init_info *ini = NULL;
e49300a6
KG		 2341 u8 proposal_version = SMC_V1;
2342 u8 accept_version;
3b2dec26 2343 int rc = 0;
3b2dec26 2344
fd57770d
KG		 2345 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2346 return smc_listen_out_err(new_smc);
2347
3b2dec26
HW		 2348 if (new_smc->use_fallback) {
2349 smc_listen_out_connected(new_smc);
2350 return;
a046d57d 2351 }
a046d57d 2352
3b2dec26
HW		 2353 /* check if peer is smc capable */
2354 if (!tcp_sk(newclcsock->sk)->syn_smc) {
c0bf3d8a
WG		 2355 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2356 if (rc)
2357 smc_listen_out_err(new_smc);
2358 else
2359 smc_listen_out_connected(new_smc);
3b2dec26
HW		 2360 return;
2361 }
a046d57d 2362
3b2dec26
HW		 2363 /* do inband token exchange -
2364 * wait for and receive SMC Proposal CLC message
2365 */
6bb14e48
UB		 2366 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2367 if (!buf) {
2368 rc = SMC_CLC_DECL_MEM;
2369 goto out_decl;
2370 }
2371 pclc = (struct smc_clc_msg_proposal *)buf;
2372 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
228bae05 2373 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
9aa68d29
KG		 2374 if (rc)
2375 goto out_decl;
e49300a6
KG		 2376
2377 if (pclc->hdr.version > SMC_V1)
2378 proposal_version = SMC_V2;
a046d57d 2379
e8d726c8 2380 /* IPSec connections opt out of SMC optimizations */
3b2dec26 2381 if (using_ipsec(new_smc)) {
9aa68d29
KG		 2382 rc = SMC_CLC_DECL_IPSEC;
2383 goto out_decl;
3b2dec26
HW		 2384 }
2385
3fc64937
UB		 2386 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2387 if (!ini) {
2388 rc = SMC_CLC_DECL_MEM;
2389 goto out_decl;
2390 }
2391
5c21c4cc
UB		 2392 /* initial version checking */
2393 rc = smc_listen_v2_check(new_smc, pclc, ini);
2394 if (rc)
9aa68d29 2395 goto out_decl;
fba7e8ef 2396
72a36a8a 2397 mutex_lock(&smc_server_lgr_pending);
3b2dec26
HW		 2398 smc_close_init(new_smc);
2399 smc_rx_init(new_smc);
2400 smc_tx_init(new_smc);
2401
7affc809 2402 /* determine ISM or RoCE device used for connection */
3fc64937 2403 rc = smc_listen_find_device(new_smc, pclc, ini);
7affc809
UB		 2404 if (rc)
2405 goto out_unlock;
3b2dec26
HW		 2406
2407 /* send SMC Accept CLC message */
e49300a6 2408 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
a7c9c5f4 2409 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
e49300a6 2410 accept_version, ini->negotiated_eid);
9aa68d29
KG		 2411 if (rc)
2412 goto out_unlock;
3b2dec26 2413
62c7139f 2414 /* SMC-D does not need this lock any more */
3fc64937 2415 if (ini->is_smcd)
72a36a8a 2416 mutex_unlock(&smc_server_lgr_pending);
62c7139f 2417
3b2dec26 2418 /* receive SMC Confirm CLC message */
9047a617
KG		 2419 memset(buf, 0, sizeof(*buf));
2420 cclc = (struct smc_clc_msg_accept_confirm *)buf;
2421 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
228bae05
KG		 2422 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2423 if (rc) {
3fc64937 2424 if (!ini->is_smcd)
9aa68d29
KG		 2425 goto out_unlock;
2426 goto out_decl;
3b2dec26
HW		 2427 }
2428
2429 /* finish worker */
3fc64937 2430 if (!ini->is_smcd) {
a7c9c5f4 2431 rc = smc_listen_rdma_finish(new_smc, cclc,
e49300a6 2432 ini->first_contact_local, ini);
62c7139f 2433 if (rc)
0c881ada
UB		 2434 goto out_unlock;
2435 mutex_unlock(&smc_server_lgr_pending);
1ca52fcf 2436 }
a7c9c5f4 2437 smc_conn_save_peer_info(new_smc, cclc);
3b2dec26 2438 smc_listen_out_connected(new_smc);
194730a9 2439 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
ac679364 2440 goto out_free;
9aa68d29
KG		 2441
2442out_unlock:
2443 mutex_unlock(&smc_server_lgr_pending);
2444out_decl:
4a9baf45 2445 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
e49300a6 2446 proposal_version);
ac679364 2447out_free:
3fc64937 2448 kfree(ini);
6bb14e48 2449 kfree(buf);
a046d57d
UB		 2450}
2451
2452static void smc_tcp_listen_work(struct work_struct *work)
2453{
2454 struct smc_sock *lsmc = container_of(work, struct smc_sock,
2455 tcp_listen_work);
3163c507 2456 struct sock *lsk = &lsmc->sk;
a046d57d
UB		 2457 struct smc_sock *new_smc;
2458 int rc = 0;
2459
3163c507
UB		 2460 lock_sock(lsk);
2461 while (lsk->sk_state == SMC_LISTEN) {
a046d57d 2462 rc = smc_clcsock_accept(lsmc, &new_smc);
a60a2b1e 2463 if (rc) /* clcsock accept queue empty or error */
a046d57d
UB		 2464 goto out;
2465 if (!new_smc)
2466 continue;
2467
8270d9c2
W		 2468 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2469 atomic_inc(&lsmc->queued_smc_hs);
2470
a046d57d 2471 new_smc->listen_smc = lsmc;
ee9dfbef 2472 new_smc->use_fallback = lsmc->use_fallback;
603cc149 2473 new_smc->fallback_rsn = lsmc->fallback_rsn;
3163c507 2474 sock_hold(lsk); /* sock_put in smc_listen_work */
a046d57d
UB		 2475 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2476 smc_copy_sock_settings_to_smc(new_smc);
bd58c7e0
UB		 2477 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
2478 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
51f1de79 2479 sock_hold(&new_smc->sk); /* sock_put in passive closing */
22ef473d 2480 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
51f1de79 2481 sock_put(&new_smc->sk);
a046d57d
UB		 2482 }
2483
2484out:
3163c507 2485 release_sock(lsk);
a60a2b1e
UB		 2486 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2487}
2488
2489static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2490{
0558226c 2491 struct smc_sock *lsmc;
a60a2b1e 2492
0558226c
WG		 2493 read_lock_bh(&listen_clcsock->sk_callback_lock);
2494 lsmc = smc_clcsock_user_data(listen_clcsock);
a60a2b1e 2495 if (!lsmc)
0558226c 2496 goto out;
a60a2b1e
UB		 2497 lsmc->clcsk_data_ready(listen_clcsock);
2498 if (lsmc->sk.sk_state == SMC_LISTEN) {
2499 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
3079e342 2500 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
a60a2b1e
UB		 2501 sock_put(&lsmc->sk);
2502 }
0558226c
WG		 2503out:
2504 read_unlock_bh(&listen_clcsock->sk_callback_lock);
a046d57d
UB		 2505}
2506
ac713874
UB		 2507static int smc_listen(struct socket *sock, int backlog)
2508{
2509 struct sock *sk = sock->sk;
2510 struct smc_sock *smc;
2511 int rc;
2512
2513 smc = smc_sk(sk);
2514 lock_sock(sk);
2515
2516 rc = -EINVAL;
cd206360 2517 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
3aba1030 2518 smc->connect_nonblock || sock->state != SS_UNCONNECTED)
ac713874
UB		 2519 goto out;
2520
2521 rc = 0;
2522 if (sk->sk_state == SMC_LISTEN) {
2523 sk->sk_max_ack_backlog = backlog;
2524 goto out;
2525 }
2526 /* some socket options are handled in core, so we could not apply
2527 * them to the clc socket -- copy smc socket options to clc socket
2528 */
2529 smc_copy_sock_settings_to_clc(smc);
ee9dfbef
UB		 2530 if (!smc->use_fallback)
2531 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
ac713874 2532
a60a2b1e
UB		 2533 /* save original sk_data_ready function and establish
2534 * smc-specific sk_data_ready function
2535 */
0558226c 2536 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
a60a2b1e
UB		 2537 smc->clcsock->sk->sk_user_data =
2538 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
97b9af7a
WG		 2539 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2540 smc_clcsock_data_ready, &smc->clcsk_data_ready);
0558226c 2541 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
8270d9c2
W		 2542
2543 /* save original ops */
2544 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2545
2546 smc->af_ops = *smc->ori_af_ops;
2547 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2548
2549 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2550
a6a6fe27
W		 2551 if (smc->limit_smc_hs)
2552 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
48b6190a 2553
ac713874 2554 rc = kernel_listen(smc->clcsock, backlog);
9ebb0c4b 2555 if (rc) {
0558226c 2556 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
97b9af7a
WG		 2557 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2558 &smc->clcsk_data_ready);
2559 smc->clcsock->sk->sk_user_data = NULL;
0558226c 2560 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
ac713874 2561 goto out;
9ebb0c4b 2562 }
ac713874
UB		 2563 sk->sk_max_ack_backlog = backlog;
2564 sk->sk_ack_backlog = 0;
2565 sk->sk_state = SMC_LISTEN;
2566
2567out:
2568 release_sock(sk);
2569 return rc;
2570}
2571
2572static int smc_accept(struct socket *sock, struct socket *new_sock,
cdfbabfb 2573 int flags, bool kern)
ac713874 2574{
a046d57d
UB		 2575 struct sock *sk = sock->sk, *nsk;
2576 DECLARE_WAITQUEUE(wait, current);
ac713874 2577 struct smc_sock *lsmc;
a046d57d
UB		 2578 long timeo;
2579 int rc = 0;
ac713874
UB		 2580
2581 lsmc = smc_sk(sk);
51f1de79 2582 sock_hold(sk); /* sock_put below */
ac713874
UB		 2583 lock_sock(sk);
2584
2585 if (lsmc->sk.sk_state != SMC_LISTEN) {
2586 rc = -EINVAL;
abb190f1 2587 release_sock(sk);
ac713874
UB		 2588 goto out;
2589 }
2590
a046d57d
UB		 2591 /* Wait for an incoming connection */
2592 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2593 add_wait_queue_exclusive(sk_sleep(sk), &wait);
2594 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2595 set_current_state(TASK_INTERRUPTIBLE);
2596 if (!timeo) {
2597 rc = -EAGAIN;
2598 break;
2599 }
2600 release_sock(sk);
2601 timeo = schedule_timeout(timeo);
2602 /* wakeup by sk_data_ready in smc_listen_work() */
2603 sched_annotate_sleep();
2604 lock_sock(sk);
2605 if (signal_pending(current)) {
2606 rc = sock_intr_errno(timeo);
2607 break;
2608 }
2609 }
2610 set_current_state(TASK_RUNNING);
2611 remove_wait_queue(sk_sleep(sk), &wait);
ac713874 2612
a046d57d
UB		 2613 if (!rc)
2614 rc = sock_error(nsk);
abb190f1
UB		 2615 release_sock(sk);
2616 if (rc)
2617 goto out;
2618
2619 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2620 /* wait till data arrives on the socket */
2621 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2622 MSEC_PER_SEC);
2623 if (smc_sk(nsk)->use_fallback) {
2624 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2625
2626 lock_sock(clcsk);
2627 if (skb_queue_empty(&clcsk->sk_receive_queue))
2628 sk_wait_data(clcsk, &timeo, NULL);
2629 release_sock(clcsk);
2630 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2631 lock_sock(nsk);
b51fa1b1 2632 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
abb190f1
UB		 2633 release_sock(nsk);
2634 }
2635 }
ac713874
UB		 2636
2637out:
51f1de79 2638 sock_put(sk); /* sock_hold above */
ac713874
UB		 2639 return rc;
2640}
2641
2642static int smc_getname(struct socket *sock, struct sockaddr *addr,
9b2c45d4 2643 int peer)
ac713874
UB		 2644{
2645 struct smc_sock *smc;
2646
b38d7324
UB		 2647 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2648 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
ac713874
UB		 2649 return -ENOTCONN;
2650
2651 smc = smc_sk(sock->sk);
2652
9b2c45d4 2653 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
ac713874
UB		 2654}
2655
2656static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2657{
2658 struct sock *sk = sock->sk;
2659 struct smc_sock *smc;
ce7ca794 2660 int rc;
ac713874
UB		 2661
2662 smc = smc_sk(sk);
2663 lock_sock(sk);
ee9dfbef 2664
ce7ca794 2665 /* SMC does not support connect with fastopen */
ee9dfbef 2666 if (msg->msg_flags & MSG_FASTOPEN) {
ce7ca794 2667 /* not connected yet, fallback */
cd206360 2668 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
c0bf3d8a
WG		 2669 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2670 if (rc)
2671 goto out;
ee9dfbef
UB		 2672 } else {
2673 rc = -EINVAL;
2674 goto out;
2675 }
ce7ca794
W		 2676 } else if ((sk->sk_state != SMC_ACTIVE) &&
2677 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2678 (sk->sk_state != SMC_INIT)) {
2679 rc = -EPIPE;
2680 goto out;
ee9dfbef
UB		 2681 }
2682
e0e4b8fa 2683 if (smc->use_fallback) {
ac713874 2684 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
e0e4b8fa 2685 } else {
e6727f39 2686 rc = smc_tx_sendmsg(smc, msg, len);
e0e4b8fa
GG		 2687 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2688 }
ac713874
UB		 2689out:
2690 release_sock(sk);
2691 return rc;
2692}
2693
2694static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2695 int flags)
2696{
2697 struct sock *sk = sock->sk;
2698 struct smc_sock *smc;
2699 int rc = -ENOTCONN;
2700
2701 smc = smc_sk(sk);
2702 lock_sock(sk);
51c5aba3
KG		 2703 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2704 /* socket was connected before, no more data to read */
2705 rc = 0;
2706 goto out;
2707 }
b38d7324
UB		 2708 if ((sk->sk_state == SMC_INIT) ||
2709 (sk->sk_state == SMC_LISTEN) ||
2710 (sk->sk_state == SMC_CLOSED))
ac713874
UB		 2711 goto out;
2712
b38d7324
UB		 2713 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2714 rc = 0;
2715 goto out;
2716 }
2717
9014db20 2718 if (smc->use_fallback) {
ac713874 2719 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
9014db20
SR		 2720 } else {
2721 msg->msg_namelen = 0;
2722 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
e0e4b8fa 2723 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
9014db20 2724 }
b38d7324 2725
ac713874
UB		 2726out:
2727 release_sock(sk);
2728 return rc;
2729}
2730
ade994f4 2731static __poll_t smc_accept_poll(struct sock *parent)
a046d57d 2732{
8dce2786 2733 struct smc_sock *isk = smc_sk(parent);
63e2480c 2734 __poll_t mask = 0;
a046d57d 2735
8dce2786
UB		 2736 spin_lock(&isk->accept_q_lock);
2737 if (!list_empty(&isk->accept_q))
a9a08845 2738 mask = EPOLLIN | EPOLLRDNORM;
8dce2786 2739 spin_unlock(&isk->accept_q_lock);
a046d57d 2740
8dce2786 2741 return mask;
a046d57d
UB		 2742}
2743
a11e1d43
LT		 2744static __poll_t smc_poll(struct file *file, struct socket *sock,
2745 poll_table *wait)
ac713874
UB		 2746{
2747 struct sock *sk = sock->sk;
ac713874 2748 struct smc_sock *smc;
50717a37 2749 __poll_t mask = 0;
ac713874 2750
8dce2786 2751 if (!sk)
a9a08845 2752 return EPOLLNVAL;
8dce2786 2753
ac713874 2754 smc = smc_sk(sock->sk);
648a5a7a 2755 if (smc->use_fallback) {
a046d57d 2756 /* delegate to CLC child sock */
a11e1d43 2757 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
784813ae 2758 sk->sk_err = smc->clcsock->sk->sk_err;
ac713874 2759 } else {
410da1e1 2760 if (sk->sk_state != SMC_CLOSED)
89ab066d 2761 sock_poll_wait(file, sock, wait);
a046d57d 2762 if (sk->sk_err)
a9a08845 2763 mask |= EPOLLERR;
b38d7324
UB		 2764 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2765 (sk->sk_state == SMC_CLOSED))
a9a08845 2766 mask |= EPOLLHUP;
8dce2786
UB		 2767 if (sk->sk_state == SMC_LISTEN) {
2768 /* woken up by sk_data_ready in smc_listen_work() */
50717a37
UB		 2769 mask |= smc_accept_poll(sk);
2770 } else if (smc->use_fallback) { /* as result of connect_work()*/
2771 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2772 wait);
2773 sk->sk_err = smc->clcsock->sk->sk_err;
8dce2786 2774 } else {
50717a37
UB		 2775 if ((sk->sk_state != SMC_INIT &&
2776 atomic_read(&smc->conn.sndbuf_space)) ||
8dce2786 2777 sk->sk_shutdown & SEND_SHUTDOWN) {
a9a08845 2778 mask |= EPOLLOUT | EPOLLWRNORM;
8dce2786
UB		 2779 } else {
2780 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2781 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2782 }
2783 if (atomic_read(&smc->conn.bytes_to_rcv))
a9a08845 2784 mask |= EPOLLIN | EPOLLRDNORM;
8dce2786 2785 if (sk->sk_shutdown & RCV_SHUTDOWN)
a9a08845 2786 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
8dce2786 2787 if (sk->sk_state == SMC_APPCLOSEWAIT1)
a9a08845 2788 mask |= EPOLLIN;
71d117f5
KG		 2789 if (smc->conn.urg_state == SMC_URG_VALID)
2790 mask |= EPOLLPRI;
8dce2786 2791 }
ac713874
UB		 2792 }
2793
2794 return mask;
2795}
2796
2797static int smc_shutdown(struct socket *sock, int how)
2798{
2799 struct sock *sk = sock->sk;
bacb6c1e 2800 bool do_shutdown = true;
ac713874
UB		 2801 struct smc_sock *smc;
2802 int rc = -EINVAL;
bacb6c1e 2803 int old_state;
b38d7324 2804 int rc1 = 0;
ac713874
UB		 2805
2806 smc = smc_sk(sk);
2807
2808 if ((how < SHUT_RD) || (how > SHUT_RDWR))
b38d7324 2809 return rc;
ac713874
UB		 2810
2811 lock_sock(sk);
2812
3aba1030
GW		 2813 if (sock->state == SS_CONNECTING) {
2814 if (sk->sk_state == SMC_ACTIVE)
2815 sock->state = SS_CONNECTED;
2816 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2817 sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2818 sk->sk_state == SMC_APPCLOSEWAIT1 ||
2819 sk->sk_state == SMC_APPCLOSEWAIT2 ||
2820 sk->sk_state == SMC_APPFINCLOSEWAIT)
2821 sock->state = SS_DISCONNECTING;
2822 }
2823
ac713874 2824 rc = -ENOTCONN;
caa21e19 2825 if ((sk->sk_state != SMC_ACTIVE) &&
b38d7324
UB		 2826 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2827 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2828 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2829 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2830 (sk->sk_state != SMC_APPFINCLOSEWAIT))
ac713874
UB		 2831 goto out;
2832 if (smc->use_fallback) {
2833 rc = kernel_sock_shutdown(smc->clcsock, how);
2834 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
1a74e993 2835 if (sk->sk_shutdown == SHUTDOWN_MASK) {
ac713874 2836 sk->sk_state = SMC_CLOSED;
3aba1030 2837 sk->sk_socket->state = SS_UNCONNECTED;
1a74e993
TL		 2838 sock_put(sk);
2839 }
b38d7324 2840 goto out;
ac713874 2841 }
b38d7324
UB		 2842 switch (how) {
2843 case SHUT_RDWR: /* shutdown in both directions */
bacb6c1e 2844 old_state = sk->sk_state;
b38d7324 2845 rc = smc_close_active(smc);
bacb6c1e
TL		 2846 if (old_state == SMC_ACTIVE &&
2847 sk->sk_state == SMC_PEERCLOSEWAIT1)
2848 do_shutdown = false;
b38d7324
UB		 2849 break;
2850 case SHUT_WR:
2851 rc = smc_close_shutdown_write(smc);
2852 break;
2853 case SHUT_RD:
1255fcb2
UB		 2854 rc = 0;
2855 /* nothing more to do because peer is not involved */
b38d7324
UB		 2856 break;
2857 }
bacb6c1e 2858 if (do_shutdown && smc->clcsock)
1255fcb2 2859 rc1 = kernel_sock_shutdown(smc->clcsock, how);
b38d7324
UB		 2860 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2861 sk->sk_shutdown |= how + 1;
ac713874 2862
3aba1030
GW		 2863 if (sk->sk_state == SMC_CLOSED)
2864 sock->state = SS_UNCONNECTED;
2865 else
2866 sock->state = SS_DISCONNECTING;
ac713874
UB		 2867out:
2868 release_sock(sk);
b38d7324 2869 return rc ? rc : rc1;
ac713874
UB		 2870}
2871
a6a6fe27
W		 2872static int __smc_getsockopt(struct socket *sock, int level, int optname,
2873 char __user *optval, int __user *optlen)
2874{
2875 struct smc_sock *smc;
2876 int val, len;
2877
2878 smc = smc_sk(sock->sk);
2879
2880 if (get_user(len, optlen))
2881 return -EFAULT;
2882
2883 len = min_t(int, len, sizeof(int));
2884
2885 if (len < 0)
2886 return -EINVAL;
2887
2888 switch (optname) {
2889 case SMC_LIMIT_HS:
2890 val = smc->limit_smc_hs;
2891 break;
2892 default:
2893 return -EOPNOTSUPP;
2894 }
2895
2896 if (put_user(len, optlen))
2897 return -EFAULT;
2898 if (copy_to_user(optval, &val, len))
2899 return -EFAULT;
2900
2901 return 0;
2902}
2903
2904static int __smc_setsockopt(struct socket *sock, int level, int optname,
2905 sockptr_t optval, unsigned int optlen)
2906{
2907 struct sock *sk = sock->sk;
2908 struct smc_sock *smc;
2909 int val, rc;
2910
2911 smc = smc_sk(sk);
2912
2913 lock_sock(sk);
2914 switch (optname) {
2915 case SMC_LIMIT_HS:
7a11455f
DC		 2916 if (optlen < sizeof(int)) {
2917 rc = -EINVAL;
2918 break;
2919 }
2920 if (copy_from_sockptr(&val, optval, sizeof(int))) {
2921 rc = -EFAULT;
2922 break;
2923 }
a6a6fe27
W		 2924
2925 smc->limit_smc_hs = !!val;
2926 rc = 0;
2927 break;
2928 default:
2929 rc = -EOPNOTSUPP;
2930 break;
2931 }
2932 release_sock(sk);
2933
2934 return rc;
2935}
2936
ac713874 2937static int smc_setsockopt(struct socket *sock, int level, int optname,
a7b75c5a 2938 sockptr_t optval, unsigned int optlen)
ac713874
UB		 2939{
2940 struct sock *sk = sock->sk;
2941 struct smc_sock *smc;
01d2f7e2 2942 int val, rc;
ac713874 2943
86214366
CW		 2944 if (level == SOL_TCP && optname == TCP_ULP)
2945 return -EOPNOTSUPP;
a6a6fe27
W		 2946 else if (level == SOL_SMC)
2947 return __smc_setsockopt(sock, level, optname, optval, optlen);
86214366 2948
ac713874
UB		 2949 smc = smc_sk(sk);
2950
2951 /* generic setsockopts reaching us here always apply to the
2952 * CLC socket
2953 */
c0bf3d8a
WG		 2954 mutex_lock(&smc->clcsock_release_lock);
2955 if (!smc->clcsock) {
2956 mutex_unlock(&smc->clcsock_release_lock);
2957 return -EBADF;
2958 }
a44d9e72
CH		 2959 if (unlikely(!smc->clcsock->ops->setsockopt))
2960 rc = -EOPNOTSUPP;
2961 else
2962 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2963 optval, optlen);
ee9dfbef
UB		 2964 if (smc->clcsock->sk->sk_err) {
2965 sk->sk_err = smc->clcsock->sk->sk_err;
e3ae2365 2966 sk_error_report(sk);
ee9dfbef 2967 }
c0bf3d8a 2968 mutex_unlock(&smc->clcsock_release_lock);
ee9dfbef 2969
01d2f7e2 2970 if (optlen < sizeof(int))
3dc9f558 2971 return -EINVAL;
a7b75c5a 2972 if (copy_from_sockptr(&val, optval, sizeof(int)))
ac0107ed 2973 return -EFAULT;
01d2f7e2 2974
ee9dfbef 2975 lock_sock(sk);
86434744
UB		 2976 if (rc || smc->use_fallback)
2977 goto out;
ee9dfbef 2978 switch (optname) {
ee9dfbef
UB		 2979 case TCP_FASTOPEN:
2980 case TCP_FASTOPEN_CONNECT:
2981 case TCP_FASTOPEN_KEY:
2982 case TCP_FASTOPEN_NO_COOKIE:
2983 /* option not supported by SMC */
8204df72 2984 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
c0bf3d8a 2985 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
ee9dfbef 2986 } else {
86434744 2987 rc = -EINVAL;
ee9dfbef
UB		 2988 }
2989 break;
01d2f7e2 2990 case TCP_NODELAY:
f9cedf1a
UB		 2991 if (sk->sk_state != SMC_INIT &&
2992 sk->sk_state != SMC_LISTEN &&
2993 sk->sk_state != SMC_CLOSED) {
e0e4b8fa 2994 if (val) {
194730a9 2995 SMC_STAT_INC(smc, ndly_cnt);
b70a5cc0
DL		 2996 smc_tx_pending(&smc->conn);
2997 cancel_delayed_work(&smc->conn.tx_work);
e0e4b8fa 2998 }
01d2f7e2
UB		 2999 }
3000 break;
3001 case TCP_CORK:
f9cedf1a
UB		 3002 if (sk->sk_state != SMC_INIT &&
3003 sk->sk_state != SMC_LISTEN &&
3004 sk->sk_state != SMC_CLOSED) {
e0e4b8fa 3005 if (!val) {
194730a9 3006 SMC_STAT_INC(smc, cork_cnt);
ea785a1a
TL		 3007 smc_tx_pending(&smc->conn);
3008 cancel_delayed_work(&smc->conn.tx_work);
e0e4b8fa 3009 }
01d2f7e2
UB		 3010 }
3011 break;
abb190f1
UB		 3012 case TCP_DEFER_ACCEPT:
3013 smc->sockopt_defer_accept = val;
3014 break;
ee9dfbef
UB		 3015 default:
3016 break;
3017 }
86434744 3018out:
ee9dfbef
UB		 3019 release_sock(sk);
3020
3021 return rc;
ac713874
UB		 3022}
3023
3024static int smc_getsockopt(struct socket *sock, int level, int optname,
3025 char __user *optval, int __user *optlen)
3026{
3027 struct smc_sock *smc;
c0bf3d8a 3028 int rc;
ac713874 3029
a6a6fe27
W		 3030 if (level == SOL_SMC)
3031 return __smc_getsockopt(sock, level, optname, optval, optlen);
3032
ac713874 3033 smc = smc_sk(sock->sk);
c0bf3d8a
WG		 3034 mutex_lock(&smc->clcsock_release_lock);
3035 if (!smc->clcsock) {
3036 mutex_unlock(&smc->clcsock_release_lock);
3037 return -EBADF;
3038 }
ac713874 3039 /* socket options apply to the CLC socket */
c0bf3d8a
WG		 3040 if (unlikely(!smc->clcsock->ops->getsockopt)) {
3041 mutex_unlock(&smc->clcsock_release_lock);
a44d9e72 3042 return -EOPNOTSUPP;
c0bf3d8a
WG		 3043 }
3044 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3045 optval, optlen);
3046 mutex_unlock(&smc->clcsock_release_lock);
3047 return rc;
ac713874
UB		 3048}
3049
3050static int smc_ioctl(struct socket *sock, unsigned int cmd,
3051 unsigned long arg)
3052{
de8474eb
SR		 3053 union smc_host_cursor cons, urg;
3054 struct smc_connection *conn;
ac713874 3055 struct smc_sock *smc;
9b67e26f 3056 int answ;
ac713874
UB		 3057
3058 smc = smc_sk(sock->sk);
de8474eb 3059 conn = &smc->conn;
7311d665 3060 lock_sock(&smc->sk);
9b67e26f 3061 if (smc->use_fallback) {
7311d665
UB		 3062 if (!smc->clcsock) {
3063 release_sock(&smc->sk);
9b67e26f 3064 return -EBADF;
7311d665
UB		 3065 }
3066 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3067 release_sock(&smc->sk);
3068 return answ;
9b67e26f
UB		 3069 }
3070 switch (cmd) {
3071 case SIOCINQ: /* same as FIONREAD */
1992d998
UB		 3072 if (smc->sk.sk_state == SMC_LISTEN) {
3073 release_sock(&smc->sk);
9b67e26f 3074 return -EINVAL;
1992d998 3075 }
2351abe6
UB		 3076 if (smc->sk.sk_state == SMC_INIT ||
3077 smc->sk.sk_state == SMC_CLOSED)
3078 answ = 0;
3079 else
3080 answ = atomic_read(&smc->conn.bytes_to_rcv);
9b67e26f
UB		 3081 break;
3082 case SIOCOUTQ:
3083 /* output queue size (not send + not acked) */
1992d998
UB		 3084 if (smc->sk.sk_state == SMC_LISTEN) {
3085 release_sock(&smc->sk);
9b67e26f 3086 return -EINVAL;
1992d998 3087 }
2351abe6
UB		 3088 if (smc->sk.sk_state == SMC_INIT ||
3089 smc->sk.sk_state == SMC_CLOSED)
3090 answ = 0;
3091 else
3092 answ = smc->conn.sndbuf_desc->len -
9b67e26f
UB		 3093 atomic_read(&smc->conn.sndbuf_space);
3094 break;
3095 case SIOCOUTQNSD:
3096 /* output queue size (not send only) */
1992d998
UB		 3097 if (smc->sk.sk_state == SMC_LISTEN) {
3098 release_sock(&smc->sk);
9b67e26f 3099 return -EINVAL;
1992d998 3100 }
2351abe6
UB		 3101 if (smc->sk.sk_state == SMC_INIT ||
3102 smc->sk.sk_state == SMC_CLOSED)
3103 answ = 0;
3104 else
3105 answ = smc_tx_prepared_sends(&smc->conn);
9b67e26f 3106 break;
de8474eb 3107 case SIOCATMARK:
1992d998
UB		 3108 if (smc->sk.sk_state == SMC_LISTEN) {
3109 release_sock(&smc->sk);
de8474eb 3110 return -EINVAL;
1992d998 3111 }
de8474eb
SR		 3112 if (smc->sk.sk_state == SMC_INIT ||
3113 smc->sk.sk_state == SMC_CLOSED) {
3114 answ = 0;
3115 } else {
bac6de7b
SR		 3116 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3117 smc_curs_copy(&urg, &conn->urg_curs, conn);
de8474eb
SR		 3118 answ = smc_curs_diff(conn->rmb_desc->len,
3119 &cons, &urg) == 1;
3120 }
3121 break;
9b67e26f 3122 default:
1992d998 3123 release_sock(&smc->sk);
9b67e26f
UB		 3124 return -ENOIOCTLCMD;
3125 }
1992d998 3126 release_sock(&smc->sk);
9b67e26f
UB		 3127
3128 return put_user(answ, (int __user *)arg);
ac713874
UB		 3129}
3130
3131static ssize_t smc_sendpage(struct socket *sock, struct page *page,
3132 int offset, size_t size, int flags)
3133{
3134 struct sock *sk = sock->sk;
3135 struct smc_sock *smc;
3136 int rc = -EPIPE;
3137
3138 smc = smc_sk(sk);
3139 lock_sock(sk);
bda27ff5
SR		 3140 if (sk->sk_state != SMC_ACTIVE) {
3141 release_sock(sk);
ac713874 3142 goto out;
bda27ff5
SR		 3143 }
3144 release_sock(sk);
e0e4b8fa 3145 if (smc->use_fallback) {
ac713874
UB		 3146 rc = kernel_sendpage(smc->clcsock, page, offset,
3147 size, flags);
e0e4b8fa 3148 } else {
be9a16cc
TL		 3149 lock_sock(sk);
3150 rc = smc_tx_sendpage(smc, page, offset, size, flags);
3151 release_sock(sk);
194730a9 3152 SMC_STAT_INC(smc, sendpage_cnt);
e0e4b8fa 3153 }
ac713874
UB		 3154
3155out:
ac713874
UB		 3156 return rc;
3157}
3158
9014db20
SR		 3159/* Map the affected portions of the rmbe into an spd, note the number of bytes
3160 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3161 * updates till whenever a respective page has been fully processed.
3162 * Note that subsequent recv() calls have to wait till all splice() processing
3163 * completed.
3164 */
ac713874
UB		 3165static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3166 struct pipe_inode_info *pipe, size_t len,
9014db20 3167 unsigned int flags)
ac713874
UB		 3168{
3169 struct sock *sk = sock->sk;
3170 struct smc_sock *smc;
3171 int rc = -ENOTCONN;
3172
3173 smc = smc_sk(sk);
3174 lock_sock(sk);
51c5aba3
KG		 3175 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3176 /* socket was connected before, no more data to read */
3177 rc = 0;
3178 goto out;
3179 }
9014db20
SR		 3180 if (sk->sk_state == SMC_INIT ||
3181 sk->sk_state == SMC_LISTEN ||
3182 sk->sk_state == SMC_CLOSED)
3183 goto out;
3184
3185 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3186 rc = 0;
ac713874 3187 goto out;
9014db20
SR		 3188 }
3189
ac713874
UB		 3190 if (smc->use_fallback) {
3191 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3192 pipe, len, flags);
3193 } else {
9014db20
SR		 3194 if (*ppos) {
3195 rc = -ESPIPE;
3196 goto out;
3197 }
3198 if (flags & SPLICE_F_NONBLOCK)
3199 flags = MSG_DONTWAIT;
3200 else
3201 flags = 0;
194730a9 3202 SMC_STAT_INC(smc, splice_cnt);
9014db20 3203 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
ac713874
UB		 3204 }
3205out:
3206 release_sock(sk);
9014db20 3207
ac713874
UB		 3208 return rc;
3209}
3210
3211/* must look like tcp */
3212static const struct proto_ops smc_sock_ops = {
3213 .family = PF_SMC,
3214 .owner = THIS_MODULE,
3215 .release = smc_release,
3216 .bind = smc_bind,
3217 .connect = smc_connect,
3218 .socketpair = sock_no_socketpair,
3219 .accept = smc_accept,
3220 .getname = smc_getname,
a11e1d43 3221 .poll = smc_poll,
ac713874
UB		 3222 .ioctl = smc_ioctl,
3223 .listen = smc_listen,
3224 .shutdown = smc_shutdown,
3225 .setsockopt = smc_setsockopt,
3226 .getsockopt = smc_getsockopt,
3227 .sendmsg = smc_sendmsg,
3228 .recvmsg = smc_recvmsg,
3229 .mmap = sock_no_mmap,
3230 .sendpage = smc_sendpage,
3231 .splice_read = smc_splice_read,
3232};
3233
d7cd421d
TL		 3234static int __smc_create(struct net *net, struct socket *sock, int protocol,
3235 int kern, struct socket *clcsock)
ac713874 3236{
aaa4d33f 3237 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
ac713874
UB		 3238 struct smc_sock *smc;
3239 struct sock *sk;
3240 int rc;
3241
3242 rc = -ESOCKTNOSUPPORT;
3243 if (sock->type != SOCK_STREAM)
3244 goto out;
3245
3246 rc = -EPROTONOSUPPORT;
aaa4d33f 3247 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
ac713874
UB		 3248 goto out;
3249
3250 rc = -ENOBUFS;
3251 sock->ops = &smc_sock_ops;
3aba1030 3252 sock->state = SS_UNCONNECTED;
aaa4d33f 3253 sk = smc_sock_alloc(net, sock, protocol);
ac713874
UB		 3254 if (!sk)
3255 goto out;
3256
3257 /* create internal TCP socket for CLC handshake and fallback */
3258 smc = smc_sk(sk);
a046d57d 3259 smc->use_fallback = false; /* assume rdma capability first */
603cc149 3260 smc->fallback_rsn = 0;
d7cd421d 3261
f9496b7c
W		 3262 /* default behavior from limit_smc_hs in every net namespace */
3263 smc->limit_smc_hs = net->smc.limit_smc_hs;
3264
d7cd421d
TL		 3265 rc = 0;
3266 if (!clcsock) {
3267 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3268 &smc->clcsock);
3269 if (rc) {
3270 sk_common_release(sk);
3271 goto out;
3272 }
9744d2bf
KI		 3273
3274 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3275 * destruction; its sk_state might not be TCP_CLOSE after
3276 * smc->sk is close()d, and TCP timers can be fired later,
3277 * which need net ref.
3278 */
3279 sk = smc->clcsock->sk;
3280 __netns_tracker_free(net, &sk->ns_tracker, false);
3281 sk->sk_net_refcnt = 1;
3282 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3283 sock_inuse_add(net, 1);
d7cd421d
TL		 3284 } else {
3285 smc->clcsock = clcsock;
a5dcb73b 3286 }
d7cd421d 3287
ac713874
UB		 3288out:
3289 return rc;
3290}
3291
d7cd421d
TL		 3292static int smc_create(struct net *net, struct socket *sock, int protocol,
3293 int kern)
3294{
3295 return __smc_create(net, sock, protocol, kern, NULL);
3296}
3297
ac713874
UB		 3298static const struct net_proto_family smc_sock_family_ops = {
3299 .family = PF_SMC,
3300 .owner = THIS_MODULE,
3301 .create = smc_create,
3302};
3303
d7cd421d
TL		 3304static int smc_ulp_init(struct sock *sk)
3305{
3306 struct socket *tcp = sk->sk_socket;
3307 struct net *net = sock_net(sk);
3308 struct socket *smcsock;
3309 int protocol, ret;
3310
3311 /* only TCP can be replaced */
3312 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3313 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3314 return -ESOCKTNOSUPPORT;
3315 /* don't handle wq now */
3316 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3317 return -ENOTCONN;
3318
3319 if (sk->sk_family == AF_INET)
3320 protocol = SMCPROTO_SMC;
3321 else
3322 protocol = SMCPROTO_SMC6;
3323
3324 smcsock = sock_alloc();
3325 if (!smcsock)
3326 return -ENFILE;
3327
3328 smcsock->type = SOCK_STREAM;
3329 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3330 ret = __smc_create(net, smcsock, protocol, 1, tcp);
3331 if (ret) {
3332 sock_release(smcsock); /* module_put() which ops won't be NULL */
3333 return ret;
3334 }
3335
3336 /* replace tcp socket to smc */
3337 smcsock->file = tcp->file;
3338 smcsock->file->private_data = smcsock;
3339 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3340 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3341 tcp->file = NULL;
3342
3343 return ret;
3344}
3345
3346static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3347 const gfp_t priority)
3348{
3349 struct inet_connection_sock *icsk = inet_csk(newsk);
3350
3351 /* don't inherit ulp ops to child when listen */
3352 icsk->icsk_ulp_ops = NULL;
3353}
3354
3355static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3356 .name = "smc",
3357 .owner = THIS_MODULE,
3358 .init = smc_ulp_init,
3359 .clone = smc_ulp_clone,
3360};
3361
64e28b52
HW		 3362unsigned int smc_net_id;
3363
3364static __net_init int smc_net_init(struct net *net)
3365{
7de8eb0d
DL		 3366 int rc;
3367
3368 rc = smc_sysctl_net_init(net);
3369 if (rc)
3370 return rc;
64e28b52
HW		 3371 return smc_pnet_net_init(net);
3372}
3373
3374static void __net_exit smc_net_exit(struct net *net)
3375{
7de8eb0d 3376 smc_sysctl_net_exit(net);
64e28b52
HW		 3377 smc_pnet_net_exit(net);
3378}
3379
194730a9
GG		 3380static __net_init int smc_net_stat_init(struct net *net)
3381{
3382 return smc_stats_init(net);
3383}
3384
3385static void __net_exit smc_net_stat_exit(struct net *net)
3386{
3387 smc_stats_exit(net);
3388}
3389
64e28b52
HW		 3390static struct pernet_operations smc_net_ops = {
3391 .init = smc_net_init,
3392 .exit = smc_net_exit,
3393 .id = &smc_net_id,
3394 .size = sizeof(struct smc_net),
3395};
3396
194730a9
GG		 3397static struct pernet_operations smc_net_stat_ops = {
3398 .init = smc_net_stat_init,
3399 .exit = smc_net_stat_exit,
3400};
3401
ac713874
UB		 3402static int __init smc_init(void)
3403{
3404 int rc;
3405
64e28b52
HW		 3406 rc = register_pernet_subsys(&smc_net_ops);
3407 if (rc)
3408 return rc;
3409
194730a9
GG		 3410 rc = register_pernet_subsys(&smc_net_stat_ops);
3411 if (rc)
62ff373d 3412 goto out_pernet_subsys;
194730a9 3413
8747716f
SR		 3414 rc = smc_ism_init();
3415 if (rc)
3416 goto out_pernet_subsys_stat;
b81a5eb7 3417 smc_clc_init();
201091eb 3418
e8372d9d 3419 rc = smc_nl_init();
6812baab 3420 if (rc)
8747716f 3421 goto out_ism;
6812baab 3422
e8372d9d
GG		 3423 rc = smc_pnet_init();
3424 if (rc)
3425 goto out_nl;
3426
22ef473d 3427 rc = -ENOMEM;
3079e342
W		 3428
3429 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3430 if (!smc_tcp_ls_wq)
3431 goto out_pnet;
3432
22ef473d
KG		 3433 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3434 if (!smc_hs_wq)
3079e342 3435 goto out_alloc_tcp_ls_wq;
22ef473d
KG		 3436
3437 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3438 if (!smc_close_wq)
3439 goto out_alloc_hs_wq;
3440
6dabd405
UB		 3441 rc = smc_core_init();
3442 if (rc) {
3443 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
194730a9 3444 goto out_alloc_wqs;
6dabd405
UB		 3445 }
3446
9bf9abea
UB		 3447 rc = smc_llc_init();
3448 if (rc) {
3449 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
6dabd405 3450 goto out_core;
9bf9abea
UB		 3451 }
3452
5f08318f
UB		 3453 rc = smc_cdc_init();
3454 if (rc) {
3455 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
6dabd405 3456 goto out_core;
5f08318f
UB		 3457 }
3458
ac713874
UB		 3459 rc = proto_register(&smc_proto, 1);
3460 if (rc) {
aaa4d33f 3461 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
6dabd405 3462 goto out_core;
ac713874
UB		 3463 }
3464
aaa4d33f
KG		 3465 rc = proto_register(&smc_proto6, 1);
3466 if (rc) {
3467 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3468 goto out_proto;
3469 }
3470
ac713874
UB		 3471 rc = sock_register(&smc_sock_family_ops);
3472 if (rc) {
3473 pr_err("%s: sock_register fails with %d\n", __func__, rc);
aaa4d33f 3474 goto out_proto6;
ac713874 3475 }
f16a7dd5 3476 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
aaa4d33f 3477 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
ac713874 3478
a4cf0443
UB		 3479 rc = smc_ib_register_client();
3480 if (rc) {
3481 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3482 goto out_sock;
3483 }
3484
d7cd421d
TL		 3485 rc = tcp_register_ulp(&smc_ulp_ops);
3486 if (rc) {
3487 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
4d08b7b5 3488 goto out_ib;
d7cd421d
TL		 3489 }
3490
c5c1cc9c 3491 static_branch_enable(&tcp_have_smc);
ac713874
UB		 3492 return 0;
3493
4d08b7b5
TL		 3494out_ib:
3495 smc_ib_unregister_client();
a4cf0443
UB		 3496out_sock:
3497 sock_unregister(PF_SMC);
aaa4d33f
KG		 3498out_proto6:
3499 proto_unregister(&smc_proto6);
ac713874
UB		 3500out_proto:
3501 proto_unregister(&smc_proto);
6dabd405
UB		 3502out_core:
3503 smc_core_exit();
22ef473d
KG		 3504out_alloc_wqs:
3505 destroy_workqueue(smc_close_wq);
3506out_alloc_hs_wq:
3507 destroy_workqueue(smc_hs_wq);
3079e342
W		 3508out_alloc_tcp_ls_wq:
3509 destroy_workqueue(smc_tcp_ls_wq);
6812baab
TR		 3510out_pnet:
3511 smc_pnet_exit();
e8372d9d
GG		 3512out_nl:
3513 smc_nl_exit();
8747716f 3514out_ism:
9d876d3e 3515 smc_clc_exit();
8747716f 3516 smc_ism_exit();
62ff373d
CZ		 3517out_pernet_subsys_stat:
3518 unregister_pernet_subsys(&smc_net_stat_ops);
8c33bf1b
Y		 3519out_pernet_subsys:
3520 unregister_pernet_subsys(&smc_net_ops);
3521
ac713874
UB		 3522 return rc;
3523}
3524
3525static void __exit smc_exit(void)
3526{
c5c1cc9c 3527 static_branch_disable(&tcp_have_smc);
d7cd421d 3528 tcp_unregister_ulp(&smc_ulp_ops);
ac713874 3529 sock_unregister(PF_SMC);
6dabd405
UB		 3530 smc_core_exit();
3531 smc_ib_unregister_client();
8c81ba20 3532 smc_ism_exit();
22ef473d 3533 destroy_workqueue(smc_close_wq);
3079e342 3534 destroy_workqueue(smc_tcp_ls_wq);
22ef473d 3535 destroy_workqueue(smc_hs_wq);
aaa4d33f 3536 proto_unregister(&smc_proto6);
ac713874 3537 proto_unregister(&smc_proto);
6812baab 3538 smc_pnet_exit();
e8372d9d 3539 smc_nl_exit();
fa086662 3540 smc_clc_exit();
194730a9 3541 unregister_pernet_subsys(&smc_net_stat_ops);
64e28b52 3542 unregister_pernet_subsys(&smc_net_ops);
4ead9c96 3543 rcu_barrier();
ac713874
UB		 3544}
3545
3546module_init(smc_init);
3547module_exit(smc_exit);
3548
3549MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3550MODULE_DESCRIPTION("smc socket address family");
3551MODULE_LICENSE("GPL");
3552MODULE_ALIAS_NETPROTO(PF_SMC);
d7cd421d 3553MODULE_ALIAS_TCP_ULP("smc");
28ec53f3 3554MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);
Linux 6.x block layer and io_uring tree(s)