blob: bacdd971615e43b9bdabcd1395caccd5320e549f [file] [log] [blame]
Thomas Gleixner09c434b2019-05-19 13:08:20 +01001// SPDX-License-Identifier: GPL-2.0-only
Ursula Braunac713872017-01-09 16:55:13 +01002/*
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 *
Ursula Brauna046d572017-01-09 16:55:16 +010010 * Initial restrictions:
Ursula Brauna046d572017-01-09 16:55:16 +010011 * - support for alternate links postponed
Ursula Brauna046d572017-01-09 16:55:16 +010012 *
Karsten Graulaaa4d332018-03-16 15:06:41 +010013 * Copyright IBM Corp. 2016, 2018
Ursula Braunac713872017-01-09 16:55:13 +010014 *
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>
Ursula Brauna046d572017-01-09 16:55:16 +010024#include <linux/workqueue.h>
Ursula Braun5f083182017-01-09 16:55:22 +010025#include <linux/in.h>
Ingo Molnarc3edc402017-02-02 08:35:14 +010026#include <linux/sched/signal.h>
Hans Wippel41349842018-06-28 19:05:11 +020027#include <linux/if_vlan.h>
Ursula Braun4ead9c92019-11-16 17:47:31 +010028#include <linux/rcupdate_wait.h>
Ursula Braunb81a5eb2020-09-26 12:44:31 +020029#include <linux/ctype.h>
Jakub Kicinski509f15b2023-01-25 23:14:21 -080030#include <linux/splice.h>
Ingo Molnarc3edc402017-02-02 08:35:14 +010031
Ursula Braunac713872017-01-09 16:55:13 +010032#include <net/sock.h>
Ursula Brauna046d572017-01-09 16:55:16 +010033#include <net/tcp.h>
Ursula Braunf16a7dd2017-01-09 16:55:26 +010034#include <net/smc.h>
Ursula Braun9b67e262018-05-02 16:56:46 +020035#include <asm/ioctls.h>
Ursula Braunac713872017-01-09 16:55:13 +010036
Hans Wippel64e28b52019-02-21 13:01:02 +010037#include <net/net_namespace.h>
38#include <net/netns/generic.h>
39#include "smc_netns.h"
40
Ursula Braunac713872017-01-09 16:55:13 +010041#include "smc.h"
Ursula Brauna046d572017-01-09 16:55:16 +010042#include "smc_clc.h"
Ursula Braun9bf9abe2017-01-09 16:55:21 +010043#include "smc_llc.h"
Ursula Braun5f083182017-01-09 16:55:22 +010044#include "smc_cdc.h"
Ursula Braun0cfdd8f2017-01-09 16:55:17 +010045#include "smc_core.h"
Ursula Brauna4cf0442017-01-09 16:55:14 +010046#include "smc_ib.h"
Hans Wippel41349842018-06-28 19:05:11 +020047#include "smc_ism.h"
Thomas Richter6812baa2017-01-09 16:55:15 +010048#include "smc_pnet.h"
Guvenc Gulcee8372d92020-12-01 20:20:43 +010049#include "smc_netlink.h"
Ursula Braune6727f32017-01-09 16:55:23 +010050#include "smc_tx.h"
Ursula Braun952310c2017-01-09 16:55:24 +010051#include "smc_rx.h"
Ursula Braunb38d7322017-01-09 16:55:25 +010052#include "smc_close.h"
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +020053#include "smc_stats.h"
Tony Lu48262602021-11-01 15:39:12 +080054#include "smc_tracepoint.h"
Dust Li462791b2022-03-01 17:43:56 +080055#include "smc_sysctl.h"
Ursula Braunac713872017-01-09 16:55:13 +010056
Hans Wippel72a36a82019-02-07 15:56:18 +010057static 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
Ursula Braun0cfdd8f2017-01-09 16:55:17 +010062 */
63
D. Wythe3079e342022-02-10 17:11:34 +080064static struct workqueue_struct *smc_tcp_ls_wq; /* wq for tcp listen work */
Karsten Graul22ef4732020-09-10 18:48:29 +020065struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
66struct workqueue_struct *smc_close_wq; /* wq for close work */
67
Ursula Brauna046d572017-01-09 16:55:16 +010068static void smc_tcp_listen_work(struct work_struct *);
Ursula Braun24ac3a02018-06-27 17:59:50 +020069static void smc_connect_work(struct work_struct *);
Ursula Brauna046d572017-01-09 16:55:16 +010070
D. Wythef9496b72022-02-10 17:11:38 +080071int 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
Ursula Braunac713872017-01-09 16:55:13 +0100110static 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
D. Wythe8270d9c2022-02-10 17:11:35 +0800117static 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;
Karsten Graul49b7d372022-04-08 17:10:35 +0200125 struct sock *child;
D. Wythe8270d9c2022-02-10 17:11:35 +0800126
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 */
Karsten Graul49b7d372022-04-08 17:10:35 +0200139 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;
D. Wythe8270d9c2022-02-10 17:11:35 +0800150
151drop:
152 dst_release(dst);
153 tcp_listendrop(sk);
154 return NULL;
155}
156
D. Wythe48b61902022-02-10 17:11:36 +0800157static 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
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100172static struct smc_hashinfo smc_v4_hashinfo = {
173 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
174};
175
Karsten Graulaaa4d332018-03-16 15:06:41 +0100176static struct smc_hashinfo smc_v6_hashinfo = {
177 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
178};
179
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100180int 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);
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100189 write_unlock_bh(&h->lock);
Eric Dumazetb3cb7642021-11-15 09:11:50 -0800190 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100191
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
Dust Li6b88af82022-03-01 17:44:02 +0800207/* 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
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100221struct proto smc_proto = {
Ursula Braunac713872017-01-09 16:55:13 +0100222 .name = "SMC",
223 .owner = THIS_MODULE,
224 .keepalive = smc_set_keepalive,
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100225 .hash = smc_hash_sk,
226 .unhash = smc_unhash_sk,
Dust Li6b88af82022-03-01 17:44:02 +0800227 .release_cb = smc_release_cb,
Ursula Braunac713872017-01-09 16:55:13 +0100228 .obj_size = sizeof(struct smc_sock),
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100229 .h.smc_hash = &smc_v4_hashinfo,
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800230 .slab_flags = SLAB_TYPESAFE_BY_RCU,
Ursula Braunac713872017-01-09 16:55:13 +0100231};
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100232EXPORT_SYMBOL_GPL(smc_proto);
Ursula Braunac713872017-01-09 16:55:13 +0100233
Karsten Graulaaa4d332018-03-16 15:06:41 +0100234struct 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,
Dust Li6b88af82022-03-01 17:44:02 +0800240 .release_cb = smc_release_cb,
Karsten Graulaaa4d332018-03-16 15:06:41 +0100241 .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
Wen Gu05582262022-04-22 15:56:19 +0800247static 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
Ursula Braunf536dff2019-10-23 15:44:05 +0200262static void smc_restore_fallback_changes(struct smc_sock *smc)
263{
Karsten Graul1ad24052020-07-18 15:06:18 +0200264 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;
Wen Gu05582262022-04-22 15:56:19 +0800267 smc_fback_restore_callbacks(smc);
Karsten Graul1ad24052020-07-18 15:06:18 +0200268 }
Ursula Braunf536dff2019-10-23 15:44:05 +0200269}
270
Ursula Braun39f41f32019-06-27 15:04:52 +0200271static int __smc_release(struct smc_sock *smc)
Ursula Braunac713872017-01-09 16:55:13 +0100272{
Ursula Braun39f41f32019-06-27 15:04:52 +0200273 struct sock *sk = &smc->sk;
Ursula Braunb38d7322017-01-09 16:55:25 +0100274 int rc = 0;
Ursula Braunac713872017-01-09 16:55:13 +0100275
Ursula Braun51f1de72018-01-26 09:28:48 +0100276 if (!smc->use_fallback) {
Ursula Braunb38d7322017-01-09 16:55:25 +0100277 rc = smc_close_active(smc);
278 sock_set_flag(sk, SOCK_DEAD);
279 sk->sk_shutdown |= SHUTDOWN_MASK;
Ursula Braunb03faa12019-02-07 15:56:15 +0100280 } else {
Dust Lie5d5aad2021-11-10 15:02:34 +0800281 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);
Ursula Braunb03faa12019-02-07 15:56:15 +0100292 }
Ursula Braunf536dff2019-10-23 15:44:05 +0200293 smc_restore_fallback_changes(smc);
Ursula Braunb38d7322017-01-09 16:55:25 +0100294 }
Cong Wang26d92e92019-01-05 23:45:26 -0800295
296 sk->sk_prot->unhash(sk);
297
Ursula Braunb03faa12019-02-07 15:56:15 +0100298 if (sk->sk_state == SMC_CLOSED) {
299 if (smc->clcsock) {
Karsten Graulfd577702019-04-11 11:17:30 +0200300 release_sock(sk);
301 smc_clcsock_release(smc);
302 lock_sock(sk);
Myungho Jung78abe3d2018-12-18 09:02:25 -0800303 }
Ursula Braunb03faa12019-02-07 15:56:15 +0100304 if (!smc->use_fallback)
305 smc_conn_free(&smc->conn);
Ursula Braun51f1de72018-01-26 09:28:48 +0100306 }
Ursula Braunac713872017-01-09 16:55:13 +0100307
Ursula Braun39f41f32019-06-27 15:04:52 +0200308 return rc;
309}
310
311static int smc_release(struct socket *sock)
312{
313 struct sock *sk = sock->sk;
314 struct smc_sock *smc;
D. Wythe9f1c50c2022-02-24 23:26:19 +0800315 int old_state, rc = 0;
Ursula Braun39f41f32019-06-27 15:04:52 +0200316
317 if (!sk)
318 goto out;
319
Ursula Braun81cf4f42019-10-21 16:13:15 +0200320 sock_hold(sk); /* sock_put below */
Ursula Braun39f41f32019-06-27 15:04:52 +0200321 smc = smc_sk(sk);
322
D. Wythe9f1c50c2022-02-24 23:26:19 +0800323 old_state = sk->sk_state;
324
Ursula Braun39f41f32019-06-27 15:04:52 +0200325 /* cleanup for a dangling non-blocking connect */
D. Wythe9f1c50c2022-02-24 23:26:19 +0800326 if (smc->connect_nonblock && old_state == SMC_INIT)
Ursula Braun39f41f32019-06-27 15:04:52 +0200327 tcp_abort(smc->clcsock->sk, ECONNABORTED);
D. Wythe5c15b312021-12-15 20:29:21 +0800328
329 if (cancel_work_sync(&smc->connect_work))
330 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
Ursula Braun39f41f32019-06-27 15:04:52 +0200331
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
D. Wythe9f1c50c2022-02-24 23:26:19 +0800340 if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
341 !smc->use_fallback)
342 smc_close_active_abort(smc);
343
Ursula Braun39f41f32019-06-27 15:04:52 +0200344 rc = __smc_release(smc);
345
Ursula Braunac713872017-01-09 16:55:13 +0100346 /* detach socket */
347 sock_orphan(sk);
348 sock->sk = NULL;
349 release_sock(sk);
350
Ursula Braun81cf4f42019-10-21 16:13:15 +0200351 sock_put(sk); /* sock_hold above */
Ursula Braun51f1de72018-01-26 09:28:48 +0100352 sock_put(sk); /* final sock_put */
Ursula Braunac713872017-01-09 16:55:13 +0100353out:
Ursula Braunb38d7322017-01-09 16:55:25 +0100354 return rc;
Ursula Braunac713872017-01-09 16:55:13 +0100355}
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;
Ursula Braunac713872017-01-09 16:55:13 +0100363}
364
Karsten Graulaaa4d332018-03-16 15:06:41 +0100365static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
366 int protocol)
Ursula Braunac713872017-01-09 16:55:13 +0100367{
368 struct smc_sock *smc;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100369 struct proto *prot;
Ursula Braunac713872017-01-09 16:55:13 +0100370 struct sock *sk;
371
Karsten Graulaaa4d332018-03-16 15:06:41 +0100372 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
373 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
Ursula Braunac713872017-01-09 16:55:13 +0100374 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;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100380 sk->sk_protocol = protocol;
Gerd Bayer833bac7e2023-08-04 19:06:23 +0200381 WRITE_ONCE(sk->sk_sndbuf, 2 * READ_ONCE(net->smc.sysctl_wmem));
382 WRITE_ONCE(sk->sk_rcvbuf, 2 * READ_ONCE(net->smc.sysctl_rmem));
Ursula Braunac713872017-01-09 16:55:13 +0100383 smc = smc_sk(sk);
Ursula Brauna046d572017-01-09 16:55:16 +0100384 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
Ursula Braun24ac3a02018-06-27 17:59:50 +0200385 INIT_WORK(&smc->connect_work, smc_connect_work);
Eric Dumazetbe7f3e52018-05-17 03:54:21 -0700386 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
Ursula Brauna046d572017-01-09 16:55:16 +0100387 INIT_LIST_HEAD(&smc->accept_q);
388 spin_lock_init(&smc->accept_q_lock);
Eric Dumazetbe7f3e52018-05-17 03:54:21 -0700389 spin_lock_init(&smc->conn.send_lock);
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100390 sk->sk_prot->hash(sk);
Myungho Jung78abe3d2018-12-18 09:02:25 -0800391 mutex_init(&smc->clcsock_release_lock);
Wen Gu97b9af72022-04-22 15:56:18 +0800392 smc_init_saved_callbacks(smc);
Ursula Braunac713872017-01-09 16:55:13 +0100393
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;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100413 if (addr->sin_family != AF_INET &&
414 addr->sin_family != AF_INET6 &&
415 addr->sin_family != AF_UNSPEC)
416 goto out;
Ursula Braunac713872017-01-09 16:55:13 +0100417 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
Karsten Graulaaa4d332018-03-16 15:06:41 +0100418 if (addr->sin_family == AF_UNSPEC &&
419 addr->sin_addr.s_addr != htonl(INADDR_ANY))
Ursula Braunac713872017-01-09 16:55:13 +0100420 goto out;
421
422 lock_sock(sk);
423
424 /* Check if socket is already active */
425 rc = -EINVAL;
Ursula Brauncd206362019-08-02 10:47:50 +0200426 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
Ursula Braunac713872017-01-09 16:55:13 +0100427 goto out_rel;
428
429 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
Tony Lu6627a202022-09-22 20:19:07 +0800430 smc->clcsock->sk->sk_reuseport = sk->sk_reuseport;
Ursula Braunac713872017-01-09 16:55:13 +0100431 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
432
433out_rel:
434 release_sock(sk);
435out:
436 return rc;
437}
438
Gerd Bayer30c3c4a2023-08-04 19:06:24 +0200439/* copy only relevant settings and flags of SOL_SOCKET level from smc to
440 * clc socket (since smc is not called for these options from net/core)
441 */
Ursula Braunac713872017-01-09 16:55:13 +0100442
443#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
444 (1UL << SOCK_KEEPOPEN) | \
445 (1UL << SOCK_LINGER) | \
446 (1UL << SOCK_BROADCAST) | \
447 (1UL << SOCK_TIMESTAMP) | \
448 (1UL << SOCK_DBG) | \
449 (1UL << SOCK_RCVTSTAMP) | \
450 (1UL << SOCK_RCVTSTAMPNS) | \
451 (1UL << SOCK_LOCALROUTE) | \
452 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
453 (1UL << SOCK_RXQ_OVFL) | \
454 (1UL << SOCK_WIFI_STATUS) | \
455 (1UL << SOCK_NOFCS) | \
Deepa Dinamani97184752019-02-02 07:34:51 -0800456 (1UL << SOCK_FILTER_LOCKED) | \
457 (1UL << SOCK_TSTAMP_NEW))
Gerd Bayer30c3c4a2023-08-04 19:06:24 +0200458
459/* if set, use value set by setsockopt() - else use IPv4 or SMC sysctl value */
460static void smc_adjust_sock_bufsizes(struct sock *nsk, struct sock *osk,
461 unsigned long mask)
462{
463 struct net *nnet = sock_net(nsk);
464
465 nsk->sk_userlocks = osk->sk_userlocks;
466 if (osk->sk_userlocks & SOCK_SNDBUF_LOCK) {
467 nsk->sk_sndbuf = osk->sk_sndbuf;
468 } else {
469 if (mask == SK_FLAGS_SMC_TO_CLC)
470 WRITE_ONCE(nsk->sk_sndbuf,
471 READ_ONCE(nnet->ipv4.sysctl_tcp_wmem[1]));
472 else
473 WRITE_ONCE(nsk->sk_sndbuf,
474 2 * READ_ONCE(nnet->smc.sysctl_wmem));
475 }
476 if (osk->sk_userlocks & SOCK_RCVBUF_LOCK) {
477 nsk->sk_rcvbuf = osk->sk_rcvbuf;
478 } else {
479 if (mask == SK_FLAGS_SMC_TO_CLC)
480 WRITE_ONCE(nsk->sk_rcvbuf,
481 READ_ONCE(nnet->ipv4.sysctl_tcp_rmem[1]));
482 else
483 WRITE_ONCE(nsk->sk_rcvbuf,
484 2 * READ_ONCE(nnet->smc.sysctl_rmem));
485 }
486}
487
488static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
489 unsigned long mask)
490{
491 /* options we don't get control via setsockopt for */
492 nsk->sk_type = osk->sk_type;
493 nsk->sk_sndtimeo = osk->sk_sndtimeo;
494 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
495 nsk->sk_mark = READ_ONCE(osk->sk_mark);
496 nsk->sk_priority = osk->sk_priority;
497 nsk->sk_rcvlowat = osk->sk_rcvlowat;
498 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
499 nsk->sk_err = osk->sk_err;
500
501 nsk->sk_flags &= ~mask;
502 nsk->sk_flags |= osk->sk_flags & mask;
503
504 smc_adjust_sock_bufsizes(nsk, osk, mask);
505}
506
Ursula Braunac713872017-01-09 16:55:13 +0100507static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
508{
509 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
510}
511
512#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
513 (1UL << SOCK_KEEPOPEN) | \
514 (1UL << SOCK_LINGER) | \
515 (1UL << SOCK_DBG))
516/* copy only settings and flags relevant for smc from clc to smc socket */
517static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
518{
519 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
520}
521
Wen Gub8d19942022-07-14 17:44:04 +0800522/* register the new vzalloced sndbuf on all links */
523static int smcr_lgr_reg_sndbufs(struct smc_link *link,
524 struct smc_buf_desc *snd_desc)
525{
526 struct smc_link_group *lgr = link->lgr;
527 int i, rc = 0;
528
529 if (!snd_desc->is_vm)
530 return -EINVAL;
531
532 /* protect against parallel smcr_link_reg_buf() */
D. Wytheb5dd4d62023-02-02 16:26:39 +0800533 down_write(&lgr->llc_conf_mutex);
Wen Gub8d19942022-07-14 17:44:04 +0800534 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
535 if (!smc_link_active(&lgr->lnk[i]))
536 continue;
537 rc = smcr_link_reg_buf(&lgr->lnk[i], snd_desc);
538 if (rc)
539 break;
540 }
D. Wytheb5dd4d62023-02-02 16:26:39 +0800541 up_write(&lgr->llc_conf_mutex);
Wen Gub8d19942022-07-14 17:44:04 +0800542 return rc;
543}
544
Karsten Graulb9247542020-04-29 17:10:41 +0200545/* register the new rmb on all links */
Karsten Graul7562a132020-05-01 12:48:01 +0200546static int smcr_lgr_reg_rmbs(struct smc_link *link,
Karsten Graulb9247542020-04-29 17:10:41 +0200547 struct smc_buf_desc *rmb_desc)
548{
Karsten Graul7562a132020-05-01 12:48:01 +0200549 struct smc_link_group *lgr = link->lgr;
D. Wythe4da68742023-02-02 16:26:41 +0800550 bool do_slow = false;
Karsten Graul7562a132020-05-01 12:48:01 +0200551 int i, rc = 0;
Karsten Graulb9247542020-04-29 17:10:41 +0200552
Karsten Grauld5500662020-05-01 12:48:05 +0200553 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
554 if (rc)
555 return rc;
D. Wythe4da68742023-02-02 16:26:41 +0800556
557 down_read(&lgr->llc_conf_mutex);
558 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
559 if (!smc_link_active(&lgr->lnk[i]))
560 continue;
561 if (!rmb_desc->is_reg_mr[link->link_idx]) {
562 up_read(&lgr->llc_conf_mutex);
563 goto slow_path;
564 }
565 }
566 /* mr register already */
567 goto fast_path;
568slow_path:
569 do_slow = true;
Karsten Grauld5500662020-05-01 12:48:05 +0200570 /* protect against parallel smc_llc_cli_rkey_exchange() and
Wen Gub8d19942022-07-14 17:44:04 +0800571 * parallel smcr_link_reg_buf()
Karsten Grauld5500662020-05-01 12:48:05 +0200572 */
D. Wytheb5dd4d62023-02-02 16:26:39 +0800573 down_write(&lgr->llc_conf_mutex);
Karsten Graulb9247542020-04-29 17:10:41 +0200574 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
Karsten Graul741a49a2020-07-18 15:06:16 +0200575 if (!smc_link_active(&lgr->lnk[i]))
Karsten Graulb9247542020-04-29 17:10:41 +0200576 continue;
Wen Gub8d19942022-07-14 17:44:04 +0800577 rc = smcr_link_reg_buf(&lgr->lnk[i], rmb_desc);
Karsten Graulb9247542020-04-29 17:10:41 +0200578 if (rc)
Karsten Graul7562a132020-05-01 12:48:01 +0200579 goto out;
Karsten Graulb9247542020-04-29 17:10:41 +0200580 }
D. Wythe4da68742023-02-02 16:26:41 +0800581fast_path:
Karsten Graul7562a132020-05-01 12:48:01 +0200582 /* exchange confirm_rkey msg with peer */
583 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
584 if (rc) {
585 rc = -EFAULT;
586 goto out;
587 }
588 rmb_desc->is_conf_rkey = true;
589out:
D. Wythe4da68742023-02-02 16:26:41 +0800590 do_slow ? up_write(&lgr->llc_conf_mutex) : up_read(&lgr->llc_conf_mutex);
Karsten Grauld5500662020-05-01 12:48:05 +0200591 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
Karsten Graul7562a132020-05-01 12:48:01 +0200592 return rc;
Karsten Graulb9247542020-04-29 17:10:41 +0200593}
594
595static int smcr_clnt_conf_first_link(struct smc_sock *smc)
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100596{
Karsten Graul387707f2020-04-29 17:10:40 +0200597 struct smc_link *link = smc->conn.lnk;
Karsten Graul0fb0b022020-04-30 15:55:43 +0200598 struct smc_llc_qentry *qentry;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100599 int rc;
600
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100601 /* receive CONFIRM LINK request from server over RoCE fabric */
Karsten Graul0fb0b022020-04-30 15:55:43 +0200602 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
603 SMC_LLC_CONFIRM_LINK);
604 if (!qentry) {
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100605 struct smc_clc_msg_decline dclc;
606
607 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
Ursula Braun2b59f582018-11-22 10:26:39 +0100608 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
Ursula Braun9ed28552018-11-22 10:26:37 +0100609 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100610 }
Karsten Graul649758f2020-05-04 14:18:48 +0200611 smc_llc_save_peer_uid(qentry);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200612 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
613 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
614 if (rc)
Karsten Graul75d320d2018-03-01 13:51:31 +0100615 return SMC_CLC_DECL_RMBE_EC;
616
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100617 rc = smc_ib_modify_qp_rts(link);
618 if (rc)
Karsten Graul603cc142018-07-25 16:35:32 +0200619 return SMC_CLC_DECL_ERR_RDYLNK;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100620
621 smc_wr_remember_qp_attr(link);
Ursula Braun652a1e42017-07-28 13:56:17 +0200622
Wen Gub8d19942022-07-14 17:44:04 +0800623 /* reg the sndbuf if it was vzalloced */
624 if (smc->conn.sndbuf_desc->is_vm) {
625 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
626 return SMC_CLC_DECL_ERR_REGBUF;
627 }
628
629 /* reg the rmb */
630 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
631 return SMC_CLC_DECL_ERR_REGBUF;
Ursula Braun652a1e42017-07-28 13:56:17 +0200632
Karsten Graul0fb0b022020-04-30 15:55:43 +0200633 /* confirm_rkey is implicit on 1st contact */
634 smc->conn.rmb_desc->is_conf_rkey = true;
635
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100636 /* send CONFIRM LINK response over RoCE fabric */
Ursula Braun947541f2018-07-25 16:35:30 +0200637 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100638 if (rc < 0)
Karsten Graul603cc142018-07-25 16:35:32 +0200639 return SMC_CLC_DECL_TIMEOUT_CL;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100640
Karsten Graul0fb0b022020-04-30 15:55:43 +0200641 smc_llc_link_active(link);
Karsten Graul0a99be42020-05-05 15:01:20 +0200642 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200643
Guangguan Wang69b888e2023-08-17 21:20:31 +0800644 if (link->lgr->max_links > 1) {
645 /* optional 2nd link, receive ADD LINK request from server */
646 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
647 SMC_LLC_ADD_LINK);
648 if (!qentry) {
649 struct smc_clc_msg_decline dclc;
Karsten Graul52bedf32018-03-01 13:51:32 +0100650
Guangguan Wang69b888e2023-08-17 21:20:31 +0800651 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
652 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
653 if (rc == -EAGAIN)
654 rc = 0; /* no DECLINE received, go with one link */
655 return rc;
656 }
657 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
658 smc_llc_cli_add_link(link, qentry);
Karsten Graul52bedf32018-03-01 13:51:32 +0100659 }
Karsten Graul75d320d2018-03-01 13:51:31 +0100660 return 0;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100661}
662
Karsten Graule5c47442021-10-16 11:37:45 +0200663static bool smc_isascii(char *hostname)
664{
665 int i;
666
667 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
668 if (!isascii(hostname[i]))
669 return false;
670 return true;
671}
672
673static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
674 struct smc_clc_msg_accept_confirm *clc)
675{
676 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
677 (struct smc_clc_msg_accept_confirm_v2 *)clc;
678 struct smc_clc_first_contact_ext *fce;
679 int clc_v2_len;
680
681 if (clc->hdr.version == SMC_V1 ||
682 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
683 return;
684
685 if (smc->conn.lgr->is_smcd) {
686 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
687 SMC_MAX_EID_LEN);
688 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
689 d1);
690 } else {
691 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
692 SMC_MAX_EID_LEN);
693 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
694 r1);
695 }
696 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
697 smc->conn.lgr->peer_os = fce->os_type;
698 smc->conn.lgr->peer_smc_release = fce->release;
699 if (smc_isascii(fce->hostname))
700 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
701 SMC_MAX_HOSTNAME_LEN);
702}
703
Hans Wippel41349842018-06-28 19:05:11 +0200704static void smcr_conn_save_peer_info(struct smc_sock *smc,
705 struct smc_clc_msg_accept_confirm *clc)
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100706{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200707 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200708
Ursula Braun3d9725a2020-09-10 18:48:23 +0200709 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
710 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200711 smc->conn.peer_rmbe_size = bufsize;
Ursula Brauncd6851f2017-01-09 16:55:18 +0100712 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200713 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100714}
715
Hans Wippel41349842018-06-28 19:05:11 +0200716static void smcd_conn_save_peer_info(struct smc_sock *smc,
717 struct smc_clc_msg_accept_confirm *clc)
718{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200719 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
Hans Wippel41349842018-06-28 19:05:11 +0200720
Ursula Braun3d9725a2020-09-10 18:48:23 +0200721 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
722 smc->conn.peer_token = clc->d0.token;
Hans Wippel41349842018-06-28 19:05:11 +0200723 /* msg header takes up space in the buffer */
724 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
725 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
726 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
727}
728
729static void smc_conn_save_peer_info(struct smc_sock *smc,
730 struct smc_clc_msg_accept_confirm *clc)
731{
732 if (smc->conn.lgr->is_smcd)
733 smcd_conn_save_peer_info(smc, clc);
734 else
735 smcr_conn_save_peer_info(smc, clc);
Karsten Graule5c47442021-10-16 11:37:45 +0200736 smc_conn_save_peer_info_fce(smc, clc);
Hans Wippel41349842018-06-28 19:05:11 +0200737}
738
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100739static void smc_link_save_peer_info(struct smc_link *link,
Karsten Graule5c47442021-10-16 11:37:45 +0200740 struct smc_clc_msg_accept_confirm *clc,
741 struct smc_init_info *ini)
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100742{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200743 link->peer_qpn = ntoh24(clc->r0.qpn);
Karsten Graule5c47442021-10-16 11:37:45 +0200744 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
745 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
Ursula Braun3d9725a2020-09-10 18:48:23 +0200746 link->peer_psn = ntoh24(clc->r0.psn);
747 link->peer_mtu = clc->r0.qp_mtu;
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100748}
749
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200750static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
751 struct smc_stats_fback *fback_arr)
752{
753 int cnt;
754
755 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
756 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
757 fback_arr[cnt].count++;
758 break;
759 }
760 if (!fback_arr[cnt].fback_code) {
761 fback_arr[cnt].fback_code = smc->fallback_rsn;
762 fback_arr[cnt].count++;
763 break;
764 }
765 }
766}
767
768static void smc_stat_fallback(struct smc_sock *smc)
769{
Guvenc Gulce194730a2021-06-16 16:52:58 +0200770 struct net *net = sock_net(&smc->sk);
771
772 mutex_lock(&net->smc.mutex_fback_rsn);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200773 if (smc->listen_smc) {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200774 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
775 net->smc.fback_rsn->srv_fback_cnt++;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200776 } else {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200777 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
778 net->smc.fback_rsn->clnt_fback_cnt++;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200779 }
Guvenc Gulce194730a2021-06-16 16:52:58 +0200780 mutex_unlock(&net->smc.mutex_fback_rsn);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200781}
782
Wen Gu341adee2022-01-26 23:33:04 +0800783/* must be called under rcu read lock */
784static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
785{
786 struct socket_wq *wq;
787 __poll_t flags;
788
789 wq = rcu_dereference(smc->sk.sk_wq);
790 if (!skwq_has_sleeper(wq))
791 return;
792
793 /* wake up smc sk->sk_wq */
794 if (!key) {
795 /* sk_state_change */
796 wake_up_interruptible_all(&wq->wait);
797 } else {
798 flags = key_to_poll(key);
799 if (flags & (EPOLLIN | EPOLLOUT))
800 /* sk_data_ready or sk_write_space */
801 wake_up_interruptible_sync_poll(&wq->wait, flags);
802 else if (flags & EPOLLERR)
803 /* sk_error_report */
804 wake_up_interruptible_poll(&wq->wait, flags);
805 }
806}
807
808static int smc_fback_mark_woken(wait_queue_entry_t *wait,
809 unsigned int mode, int sync, void *key)
810{
811 struct smc_mark_woken *mark =
812 container_of(wait, struct smc_mark_woken, wait_entry);
813
814 mark->woken = true;
815 mark->key = key;
816 return 0;
817}
818
819static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
820 void (*clcsock_callback)(struct sock *sk))
821{
822 struct smc_mark_woken mark = { .woken = false };
823 struct socket_wq *wq;
824
825 init_waitqueue_func_entry(&mark.wait_entry,
826 smc_fback_mark_woken);
827 rcu_read_lock();
828 wq = rcu_dereference(clcsk->sk_wq);
829 if (!wq)
830 goto out;
831 add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
832 clcsock_callback(clcsk);
833 remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
834
835 if (mark.woken)
836 smc_fback_wakeup_waitqueue(smc, mark.key);
837out:
838 rcu_read_unlock();
839}
840
841static void smc_fback_state_change(struct sock *clcsk)
842{
Wen Gu05582262022-04-22 15:56:19 +0800843 struct smc_sock *smc;
Wen Gu341adee2022-01-26 23:33:04 +0800844
Wen Gu05582262022-04-22 15:56:19 +0800845 read_lock_bh(&clcsk->sk_callback_lock);
846 smc = smc_clcsock_user_data(clcsk);
847 if (smc)
848 smc_fback_forward_wakeup(smc, clcsk,
849 smc->clcsk_state_change);
850 read_unlock_bh(&clcsk->sk_callback_lock);
Wen Gu341adee2022-01-26 23:33:04 +0800851}
852
853static void smc_fback_data_ready(struct sock *clcsk)
854{
Wen Gu05582262022-04-22 15:56:19 +0800855 struct smc_sock *smc;
Wen Gu341adee2022-01-26 23:33:04 +0800856
Wen Gu05582262022-04-22 15:56:19 +0800857 read_lock_bh(&clcsk->sk_callback_lock);
858 smc = smc_clcsock_user_data(clcsk);
859 if (smc)
860 smc_fback_forward_wakeup(smc, clcsk,
861 smc->clcsk_data_ready);
862 read_unlock_bh(&clcsk->sk_callback_lock);
Wen Gu341adee2022-01-26 23:33:04 +0800863}
864
865static void smc_fback_write_space(struct sock *clcsk)
866{
Wen Gu05582262022-04-22 15:56:19 +0800867 struct smc_sock *smc;
Wen Gu341adee2022-01-26 23:33:04 +0800868
Wen Gu05582262022-04-22 15:56:19 +0800869 read_lock_bh(&clcsk->sk_callback_lock);
870 smc = smc_clcsock_user_data(clcsk);
871 if (smc)
872 smc_fback_forward_wakeup(smc, clcsk,
873 smc->clcsk_write_space);
874 read_unlock_bh(&clcsk->sk_callback_lock);
Wen Gu341adee2022-01-26 23:33:04 +0800875}
876
877static void smc_fback_error_report(struct sock *clcsk)
878{
Wen Gu05582262022-04-22 15:56:19 +0800879 struct smc_sock *smc;
Wen Gu341adee2022-01-26 23:33:04 +0800880
Wen Gu05582262022-04-22 15:56:19 +0800881 read_lock_bh(&clcsk->sk_callback_lock);
882 smc = smc_clcsock_user_data(clcsk);
883 if (smc)
884 smc_fback_forward_wakeup(smc, clcsk,
885 smc->clcsk_error_report);
886 read_unlock_bh(&clcsk->sk_callback_lock);
Wen Gu341adee2022-01-26 23:33:04 +0800887}
888
Wen Gu97b9af72022-04-22 15:56:18 +0800889static void smc_fback_replace_callbacks(struct smc_sock *smc)
890{
891 struct sock *clcsk = smc->clcsock->sk;
892
Wen Gu05582262022-04-22 15:56:19 +0800893 write_lock_bh(&clcsk->sk_callback_lock);
Wen Gu97b9af72022-04-22 15:56:18 +0800894 clcsk->sk_user_data = (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
895
896 smc_clcsock_replace_cb(&clcsk->sk_state_change, smc_fback_state_change,
897 &smc->clcsk_state_change);
898 smc_clcsock_replace_cb(&clcsk->sk_data_ready, smc_fback_data_ready,
899 &smc->clcsk_data_ready);
900 smc_clcsock_replace_cb(&clcsk->sk_write_space, smc_fback_write_space,
901 &smc->clcsk_write_space);
902 smc_clcsock_replace_cb(&clcsk->sk_error_report, smc_fback_error_report,
903 &smc->clcsk_error_report);
Wen Gu05582262022-04-22 15:56:19 +0800904
905 write_unlock_bh(&clcsk->sk_callback_lock);
Wen Gu97b9af72022-04-22 15:56:18 +0800906}
907
Wen Guc0bf3d82022-01-22 17:43:09 +0800908static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
Ursula Braun07603b22019-04-11 11:17:32 +0200909{
Wen Gu1de97702022-02-09 22:10:53 +0800910 int rc = 0;
Wen Gu2153bd12021-11-13 15:33:35 +0800911
Wen Guc0bf3d82022-01-22 17:43:09 +0800912 mutex_lock(&smc->clcsock_release_lock);
913 if (!smc->clcsock) {
Wen Gu1de97702022-02-09 22:10:53 +0800914 rc = -EBADF;
915 goto out;
Wen Guc0bf3d82022-01-22 17:43:09 +0800916 }
Wen Gu341adee2022-01-26 23:33:04 +0800917
Ursula Braun07603b22019-04-11 11:17:32 +0200918 smc->use_fallback = true;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200919 smc->fallback_rsn = reason_code;
920 smc_stat_fallback(smc);
Tony Lu48262602021-11-01 15:39:12 +0800921 trace_smc_switch_to_fallback(smc, reason_code);
Ursula Braun07603b22019-04-11 11:17:32 +0200922 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
923 smc->clcsock->file = smc->sk.sk_socket->file;
924 smc->clcsock->file->private_data = smc->clcsock;
Ursula Braun67f562e2020-02-14 08:58:59 +0100925 smc->clcsock->wq.fasync_list =
926 smc->sk.sk_socket->wq.fasync_list;
Wen Gu2153bd12021-11-13 15:33:35 +0800927
Wen Gu341adee2022-01-26 23:33:04 +0800928 /* There might be some wait entries remaining
929 * in smc sk->sk_wq and they should be woken up
930 * as clcsock's wait queue is woken up.
Wen Gu2153bd12021-11-13 15:33:35 +0800931 */
Wen Gu97b9af72022-04-22 15:56:18 +0800932 smc_fback_replace_callbacks(smc);
Ursula Braun07603b22019-04-11 11:17:32 +0200933 }
Wen Gu1de97702022-02-09 22:10:53 +0800934out:
Wen Guc0bf3d82022-01-22 17:43:09 +0800935 mutex_unlock(&smc->clcsock_release_lock);
Wen Gu1de97702022-02-09 22:10:53 +0800936 return rc;
Ursula Braun07603b22019-04-11 11:17:32 +0200937}
938
Hans Wippel3b2dec22018-05-18 09:34:18 +0200939/* fall back during connect */
Karsten Graul603cc142018-07-25 16:35:32 +0200940static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200941{
Wen Guc0bf3d82022-01-22 17:43:09 +0800942 struct net *net = sock_net(&smc->sk);
943 int rc = 0;
944
945 rc = smc_switch_to_fallback(smc, reason_code);
946 if (rc) { /* fallback fails */
947 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
948 if (smc->sk.sk_state == SMC_INIT)
949 sock_put(&smc->sk); /* passive closing */
950 return rc;
951 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200952 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +0200953 smc->connect_nonblock = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200954 if (smc->sk.sk_state == SMC_INIT)
955 smc->sk.sk_state = SMC_ACTIVE;
956 return 0;
957}
958
959/* decline and fall back during connect */
Ursula Braune8d726c82020-09-26 12:44:32 +0200960static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
961 u8 version)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200962{
Guvenc Gulce194730a2021-06-16 16:52:58 +0200963 struct net *net = sock_net(&smc->sk);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200964 int rc;
965
Ursula Braune1bbdd52018-07-05 16:15:30 +0200966 if (reason_code < 0) { /* error, fallback is not possible */
Guvenc Gulce194730a2021-06-16 16:52:58 +0200967 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200968 if (smc->sk.sk_state == SMC_INIT)
969 sock_put(&smc->sk); /* passive closing */
Hans Wippel3b2dec22018-05-18 09:34:18 +0200970 return reason_code;
Ursula Braune1bbdd52018-07-05 16:15:30 +0200971 }
Karsten Graul603cc142018-07-25 16:35:32 +0200972 if (reason_code != SMC_CLC_DECL_PEERDECL) {
Ursula Braune8d726c82020-09-26 12:44:32 +0200973 rc = smc_clc_send_decline(smc, reason_code, version);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200974 if (rc < 0) {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200975 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200976 if (smc->sk.sk_state == SMC_INIT)
977 sock_put(&smc->sk); /* passive closing */
Hans Wippel3b2dec22018-05-18 09:34:18 +0200978 return rc;
Ursula Braune1bbdd52018-07-05 16:15:30 +0200979 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200980 }
Karsten Graul603cc142018-07-25 16:35:32 +0200981 return smc_connect_fallback(smc, reason_code);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200982}
983
Karsten Graul8cf3f3e2020-12-01 20:20:36 +0100984static void smc_conn_abort(struct smc_sock *smc, int local_first)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200985{
Wen Gu36595d82022-01-06 20:42:08 +0800986 struct smc_connection *conn = &smc->conn;
987 struct smc_link_group *lgr = conn->lgr;
Wen Guea89c6c2022-01-13 16:36:41 +0800988 bool lgr_valid = false;
989
990 if (smc_conn_lgr_valid(conn))
991 lgr_valid = true;
Wen Gu36595d82022-01-06 20:42:08 +0800992
993 smc_conn_free(conn);
Wen Guea89c6c2022-01-13 16:36:41 +0800994 if (local_first && lgr_valid)
Wen Gu36595d82022-01-06 20:42:08 +0800995 smc_lgr_cleanup_early(lgr);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200996}
997
998/* check if there is a rdma device available for this connection. */
999/* called for connect and listen */
Karsten Graul228bae02019-04-12 12:57:28 +02001000static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001001{
Hans Wippel3b2dec22018-05-18 09:34:18 +02001002 /* PNET table look up: search active ib_device and port
1003 * within same PNETID that also contains the ethernet device
1004 * used for the internal TCP socket
1005 */
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001006 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
Karsten Graul42042db2021-10-16 11:37:44 +02001007 if (!ini->check_smcrv2 && !ini->ib_dev)
1008 return SMC_CLC_DECL_NOSMCRDEV;
1009 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
Karsten Graul9aa68d22019-04-12 12:57:29 +02001010 return SMC_CLC_DECL_NOSMCRDEV;
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001011 return 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001012}
1013
Hans Wippel41349842018-06-28 19:05:11 +02001014/* check if there is an ISM device available for this connection. */
1015/* called for connect and listen */
Karsten Graul228bae02019-04-12 12:57:28 +02001016static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001017{
1018 /* Find ISM device with same PNETID as connecting interface */
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001019 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
Ursula Braun3fc64932020-09-26 12:44:23 +02001020 if (!ini->ism_dev[0])
Karsten Graul9aa68d22019-04-12 12:57:29 +02001021 return SMC_CLC_DECL_NOSMCDDEV;
Ursula Braun8caaccf2020-09-26 12:44:25 +02001022 else
1023 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
Hans Wippel41349842018-06-28 19:05:11 +02001024 return 0;
1025}
1026
Karsten Graul839d6962020-10-02 17:09:26 +02001027/* is chid unique for the ism devices that are already determined? */
1028static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
1029 int cnt)
1030{
1031 int i = (!ini->ism_dev[0]) ? 1 : 0;
1032
1033 for (; i < cnt; i++)
1034 if (ini->ism_chid[i] == chid)
1035 return false;
1036 return true;
1037}
1038
Ursula Braund70bf4f2020-09-26 12:44:27 +02001039/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
1040 * PNETID matching net_device)
1041 */
1042static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
1043 struct smc_init_info *ini)
1044{
1045 int rc = SMC_CLC_DECL_NOSMCDDEV;
1046 struct smcd_dev *smcd;
1047 int i = 1;
Karsten Graul839d6962020-10-02 17:09:26 +02001048 u16 chid;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001049
1050 if (smcd_indicated(ini->smc_type_v1))
1051 rc = 0; /* already initialized for V1 */
1052 mutex_lock(&smcd_dev_list.mutex);
1053 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1054 if (smcd->going_away || smcd == ini->ism_dev[0])
1055 continue;
Karsten Graul839d6962020-10-02 17:09:26 +02001056 chid = smc_ism_get_chid(smcd);
1057 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
1058 continue;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001059 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
1060 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
1061 ini->ism_dev[i] = smcd;
Karsten Graul839d6962020-10-02 17:09:26 +02001062 ini->ism_chid[i] = chid;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001063 ini->is_smcd = true;
1064 rc = 0;
1065 i++;
1066 if (i > SMC_MAX_ISM_DEVS)
1067 break;
1068 }
1069 }
1070 mutex_unlock(&smcd_dev_list.mutex);
1071 ini->ism_offered_cnt = i - 1;
1072 if (!ini->ism_dev[0] && !ini->ism_dev[1])
1073 ini->smcd_version = 0;
1074
1075 return rc;
1076}
1077
Hans Wippel41349842018-06-28 19:05:11 +02001078/* Check for VLAN ID and register it on ISM device just for CLC handshake */
1079static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001080 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001081{
Ursula Braun3fc64932020-09-26 12:44:23 +02001082 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
Karsten Graul7a62725a2019-04-12 12:57:30 +02001083 return SMC_CLC_DECL_ISMVLANERR;
Hans Wippel41349842018-06-28 19:05:11 +02001084 return 0;
1085}
1086
Ursula Braund70bf4f2020-09-26 12:44:27 +02001087static int smc_find_proposal_devices(struct smc_sock *smc,
1088 struct smc_init_info *ini)
1089{
1090 int rc = 0;
1091
1092 /* check if there is an ism device available */
Karsten Graul42042db2021-10-16 11:37:44 +02001093 if (!(ini->smcd_version & SMC_V1) ||
1094 smc_find_ism_device(smc, ini) ||
1095 smc_connect_ism_vlan_setup(smc, ini))
1096 ini->smcd_version &= ~SMC_V1;
1097 /* else ISM V1 is supported for this connection */
1098
1099 /* check if there is an rdma device available */
1100 if (!(ini->smcr_version & SMC_V1) ||
1101 smc_find_rdma_device(smc, ini))
1102 ini->smcr_version &= ~SMC_V1;
1103 /* else RDMA is supported for this connection */
1104
1105 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
1106 ini->smcr_version & SMC_V1);
1107
1108 /* check if there is an ism v2 device available */
1109 if (!(ini->smcd_version & SMC_V2) ||
1110 !smc_ism_is_v2_capable() ||
1111 smc_find_ism_v2_device_clnt(smc, ini))
1112 ini->smcd_version &= ~SMC_V2;
1113
1114 /* check if there is an rdma v2 device available */
1115 ini->check_smcrv2 = true;
1116 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
1117 if (!(ini->smcr_version & SMC_V2) ||
1118 smc->clcsock->sk->sk_family != AF_INET ||
1119 !smc_clc_ueid_count() ||
1120 smc_find_rdma_device(smc, ini))
1121 ini->smcr_version &= ~SMC_V2;
1122 ini->check_smcrv2 = false;
1123
1124 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
1125 ini->smcr_version & SMC_V2);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001126
1127 /* if neither ISM nor RDMA are supported, fallback */
Karsten Graul42042db2021-10-16 11:37:44 +02001128 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
Ursula Braund70bf4f2020-09-26 12:44:27 +02001129 rc = SMC_CLC_DECL_NOSMCDEV;
1130
1131 return rc;
1132}
1133
Hans Wippel41349842018-06-28 19:05:11 +02001134/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
1135 * used, the VLAN ID will be registered again during the connection setup.
1136 */
Ursula Braund70bf4f2020-09-26 12:44:27 +02001137static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001138 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001139{
Ursula Braund70bf4f2020-09-26 12:44:27 +02001140 if (!smcd_indicated(ini->smc_type_v1))
Hans Wippel41349842018-06-28 19:05:11 +02001141 return 0;
Ursula Braun3fc64932020-09-26 12:44:23 +02001142 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
Hans Wippel41349842018-06-28 19:05:11 +02001143 return SMC_CLC_DECL_CNFERR;
1144 return 0;
1145}
1146
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001147#define SMC_CLC_MAX_ACCEPT_LEN \
1148 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
Guangguan Wang72901782023-08-17 21:20:28 +08001149 sizeof(struct smc_clc_first_contact_ext_v2x) + \
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001150 sizeof(struct smc_clc_msg_trail))
1151
Hans Wippel3b2dec22018-05-18 09:34:18 +02001152/* CLC handshake during connect */
Ursula Braund70bf4f2020-09-26 12:44:27 +02001153static int smc_connect_clc(struct smc_sock *smc,
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001154 struct smc_clc_msg_accept_confirm_v2 *aclc2,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001155 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001156{
1157 int rc = 0;
1158
1159 /* do inband token exchange */
Ursula Braund70bf4f2020-09-26 12:44:27 +02001160 rc = smc_clc_send_proposal(smc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001161 if (rc)
1162 return rc;
1163 /* receive SMC Accept CLC message */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001164 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
1165 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001166}
1167
Karsten Graulb4ba4652021-10-16 11:37:50 +02001168void smc_fill_gid_list(struct smc_link_group *lgr,
1169 struct smc_gidlist *gidlist,
1170 struct smc_ib_device *known_dev, u8 *known_gid)
Karsten Graule5c47442021-10-16 11:37:45 +02001171{
1172 struct smc_init_info *alt_ini = NULL;
1173
1174 memset(gidlist, 0, sizeof(*gidlist));
1175 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
1176
1177 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
1178 if (!alt_ini)
1179 goto out;
1180
1181 alt_ini->vlan_id = lgr->vlan_id;
1182 alt_ini->check_smcrv2 = true;
1183 alt_ini->smcrv2.saddr = lgr->saddr;
1184 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
1185
1186 if (!alt_ini->smcrv2.ib_dev_v2)
1187 goto out;
1188
1189 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
1190 SMC_GID_SIZE);
1191
1192out:
1193 kfree(alt_ini);
1194}
1195
1196static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
1197 struct smc_clc_msg_accept_confirm *aclc,
1198 struct smc_init_info *ini)
1199{
1200 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1201 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1202 struct smc_clc_first_contact_ext *fce =
Guangguan Wang1e700942023-08-17 21:20:27 +08001203 smc_get_clc_first_contact_ext(clc_v2, false);
Guangguan Wang6ac1e6562023-08-17 21:20:29 +08001204 int rc;
Karsten Graule5c47442021-10-16 11:37:45 +02001205
1206 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
1207 return 0;
1208
1209 if (fce->v2_direct) {
1210 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
1211 ini->smcrv2.uses_gateway = false;
1212 } else {
1213 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr,
1214 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
1215 ini->smcrv2.nexthop_mac,
1216 &ini->smcrv2.uses_gateway))
1217 return SMC_CLC_DECL_NOROUTE;
1218 if (!ini->smcrv2.uses_gateway) {
1219 /* mismatch: peer claims indirect, but its direct */
1220 return SMC_CLC_DECL_NOINDIRECT;
1221 }
1222 }
Guangguan Wang1e700942023-08-17 21:20:27 +08001223
1224 ini->release_nr = fce->release;
Guangguan Wang6ac1e6562023-08-17 21:20:29 +08001225 rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1226 if (rc)
1227 return rc;
Guangguan Wang1e700942023-08-17 21:20:27 +08001228
Karsten Graule5c47442021-10-16 11:37:45 +02001229 return 0;
1230}
1231
Ursula Brauna046d572017-01-09 16:55:16 +01001232/* setup for RDMA connection of client */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001233static int smc_connect_rdma(struct smc_sock *smc,
1234 struct smc_clc_msg_accept_confirm *aclc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001235 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001236{
Karsten Graul0fb0b022020-04-30 15:55:43 +02001237 int i, reason_code = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001238 struct smc_link *link;
Karsten Graule5c47442021-10-16 11:37:45 +02001239 u8 *eid = NULL;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001240
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001241 ini->is_smcd = false;
Ursula Braun3d9725a2020-09-10 18:48:23 +02001242 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
Ursula Braunf1eb02f2020-09-26 12:44:20 +02001243 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
Karsten Graule5c47442021-10-16 11:37:45 +02001244 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
1245 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
1246 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
Guangguan Wang7f0620b2023-08-17 21:20:30 +08001247 ini->max_conns = SMC_CONN_PER_LGR_MAX;
Guangguan Wang69b888e2023-08-17 21:20:31 +08001248 ini->max_links = SMC_LINKS_ADD_LNK_MAX;
Karsten Graule5c47442021-10-16 11:37:45 +02001249
1250 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
1251 if (reason_code)
1252 return reason_code;
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001253
Hans Wippel72a36a82019-02-07 15:56:18 +01001254 mutex_lock(&smc_client_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +02001255 reason_code = smc_conn_create(smc, ini);
1256 if (reason_code) {
Hans Wippel72a36a82019-02-07 15:56:18 +01001257 mutex_unlock(&smc_client_lgr_pending);
1258 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001259 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001260
1261 smc_conn_save_peer_info(smc, aclc);
1262
Ursula Braun5ac54d82020-09-10 18:48:21 +02001263 if (ini->first_contact_local) {
Karsten Graul0fb0b022020-04-30 15:55:43 +02001264 link = smc->conn.lnk;
1265 } else {
1266 /* set link that was assigned by server */
1267 link = NULL;
1268 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1269 struct smc_link *l = &smc->conn.lgr->lnk[i];
1270
Ursula Braun3d9725a2020-09-10 18:48:23 +02001271 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
1272 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
1273 SMC_GID_SIZE) &&
Karsten Graule5c47442021-10-16 11:37:45 +02001274 (aclc->hdr.version > SMC_V1 ||
1275 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
1276 sizeof(l->peer_mac)))) {
Karsten Graul0fb0b022020-04-30 15:55:43 +02001277 link = l;
1278 break;
1279 }
1280 }
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001281 if (!link) {
1282 reason_code = SMC_CLC_DECL_NOSRVLINK;
1283 goto connect_abort;
1284 }
Guvenc Gulce64513d22021-08-09 11:05:57 +02001285 smc_switch_link_and_count(&smc->conn, link);
Karsten Graul0fb0b022020-04-30 15:55:43 +02001286 }
1287
Hans Wippel3b2dec22018-05-18 09:34:18 +02001288 /* create send buffer and rmb */
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001289 if (smc_buf_create(smc, false)) {
1290 reason_code = SMC_CLC_DECL_MEM;
1291 goto connect_abort;
1292 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001293
Ursula Braun5ac54d82020-09-10 18:48:21 +02001294 if (ini->first_contact_local)
Karsten Graule5c47442021-10-16 11:37:45 +02001295 smc_link_save_peer_info(link, aclc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001296
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001297 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
1298 reason_code = SMC_CLC_DECL_ERR_RTOK;
1299 goto connect_abort;
1300 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001301
1302 smc_close_init(smc);
1303 smc_rx_init(smc);
1304
Ursula Braun5ac54d82020-09-10 18:48:21 +02001305 if (ini->first_contact_local) {
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001306 if (smc_ib_ready_link(link)) {
1307 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
1308 goto connect_abort;
1309 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001310 } else {
Wen Gub8d19942022-07-14 17:44:04 +08001311 /* reg sendbufs if they were vzalloced */
1312 if (smc->conn.sndbuf_desc->is_vm) {
1313 if (smcr_lgr_reg_sndbufs(link, smc->conn.sndbuf_desc)) {
1314 reason_code = SMC_CLC_DECL_ERR_REGBUF;
1315 goto connect_abort;
1316 }
1317 }
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001318 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
Wen Gub8d19942022-07-14 17:44:04 +08001319 reason_code = SMC_CLC_DECL_ERR_REGBUF;
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001320 goto connect_abort;
1321 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001322 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02001323
Karsten Graule5c47442021-10-16 11:37:45 +02001324 if (aclc->hdr.version > SMC_V1) {
1325 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1326 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1327
1328 eid = clc_v2->r1.eid;
1329 if (ini->first_contact_local)
1330 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
1331 link->smcibdev, link->gid);
1332 }
1333
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001334 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
Karsten Graule5c47442021-10-16 11:37:45 +02001335 aclc->hdr.version, eid, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001336 if (reason_code)
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001337 goto connect_abort;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001338
1339 smc_tx_init(smc);
1340
Ursula Braun5ac54d82020-09-10 18:48:21 +02001341 if (ini->first_contact_local) {
Hans Wippel3b2dec22018-05-18 09:34:18 +02001342 /* QP confirmation over RoCE fabric */
Karsten Graul0fb0b022020-04-30 15:55:43 +02001343 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
Karsten Graulb9247542020-04-29 17:10:41 +02001344 reason_code = smcr_clnt_conf_first_link(smc);
Karsten Graul0fb0b022020-04-30 15:55:43 +02001345 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001346 if (reason_code)
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001347 goto connect_abort;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001348 }
Hans Wippel72a36a82019-02-07 15:56:18 +01001349 mutex_unlock(&smc_client_lgr_pending);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001350
1351 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +02001352 smc->connect_nonblock = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001353 if (smc->sk.sk_state == SMC_INIT)
1354 smc->sk.sk_state = SMC_ACTIVE;
1355
1356 return 0;
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001357connect_abort:
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001358 smc_conn_abort(smc, ini->first_contact_local);
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001359 mutex_unlock(&smc_client_lgr_pending);
1360 smc->connect_nonblock = 0;
1361
1362 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001363}
1364
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001365/* The server has chosen one of the proposed ISM devices for the communication.
1366 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
1367 */
1368static int
1369smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
1370 struct smc_init_info *ini)
1371{
1372 int i;
1373
1374 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
Karsten Graule5c47442021-10-16 11:37:45 +02001375 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001376 ini->ism_selected = i;
1377 return 0;
1378 }
1379 }
1380
1381 return -EPROTO;
1382}
1383
Hans Wippel41349842018-06-28 19:05:11 +02001384/* setup for ISM connection of client */
1385static int smc_connect_ism(struct smc_sock *smc,
1386 struct smc_clc_msg_accept_confirm *aclc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001387 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001388{
Karsten Graulfa086662021-09-14 10:35:05 +02001389 u8 *eid = NULL;
Hans Wippel41349842018-06-28 19:05:11 +02001390 int rc = 0;
1391
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001392 ini->is_smcd = true;
Ursula Braunf1eb02f2020-09-26 12:44:20 +02001393 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001394
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001395 if (aclc->hdr.version == SMC_V2) {
1396 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1397 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1398
Guangguan Wang1e700942023-08-17 21:20:27 +08001399 if (ini->first_contact_peer) {
1400 struct smc_clc_first_contact_ext *fce =
1401 smc_get_clc_first_contact_ext(aclc_v2, true);
1402
1403 ini->release_nr = fce->release;
Guangguan Wang6ac1e6562023-08-17 21:20:29 +08001404 rc = smc_clc_clnt_v2x_features_validate(fce, ini);
1405 if (rc)
1406 return rc;
Guangguan Wang1e700942023-08-17 21:20:27 +08001407 }
1408
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001409 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1410 if (rc)
1411 return rc;
1412 }
1413 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1414
Hans Wippel72a36a82019-02-07 15:56:18 +01001415 /* there is only one lgr role for SMC-D; use server lock */
1416 mutex_lock(&smc_server_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +02001417 rc = smc_conn_create(smc, ini);
1418 if (rc) {
Hans Wippel72a36a82019-02-07 15:56:18 +01001419 mutex_unlock(&smc_server_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +02001420 return rc;
Hans Wippel72a36a82019-02-07 15:56:18 +01001421 }
Hans Wippel41349842018-06-28 19:05:11 +02001422
1423 /* Create send and receive buffers */
Karsten Graul72b7f6c2020-07-26 20:34:28 +02001424 rc = smc_buf_create(smc, true);
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001425 if (rc) {
1426 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1427 goto connect_abort;
1428 }
Hans Wippel41349842018-06-28 19:05:11 +02001429
1430 smc_conn_save_peer_info(smc, aclc);
1431 smc_close_init(smc);
1432 smc_rx_init(smc);
1433 smc_tx_init(smc);
1434
Karsten Graulfa086662021-09-14 10:35:05 +02001435 if (aclc->hdr.version > SMC_V1) {
1436 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1437 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1438
Karsten Graule5c47442021-10-16 11:37:45 +02001439 eid = clc_v2->d1.eid;
Karsten Graulfa086662021-09-14 10:35:05 +02001440 }
1441
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001442 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
Guangguan Wang1e700942023-08-17 21:20:27 +08001443 aclc->hdr.version, eid, ini);
Hans Wippel41349842018-06-28 19:05:11 +02001444 if (rc)
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001445 goto connect_abort;
Hans Wippel72a36a82019-02-07 15:56:18 +01001446 mutex_unlock(&smc_server_lgr_pending);
Hans Wippel41349842018-06-28 19:05:11 +02001447
1448 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +02001449 smc->connect_nonblock = 0;
Hans Wippel41349842018-06-28 19:05:11 +02001450 if (smc->sk.sk_state == SMC_INIT)
1451 smc->sk.sk_state = SMC_ACTIVE;
1452
1453 return 0;
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001454connect_abort:
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001455 smc_conn_abort(smc, ini->first_contact_local);
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001456 mutex_unlock(&smc_server_lgr_pending);
1457 smc->connect_nonblock = 0;
1458
1459 return rc;
Hans Wippel41349842018-06-28 19:05:11 +02001460}
1461
Ursula Braund70bf4f2020-09-26 12:44:27 +02001462/* check if received accept type and version matches a proposed one */
1463static int smc_connect_check_aclc(struct smc_init_info *ini,
1464 struct smc_clc_msg_accept_confirm *aclc)
1465{
Karsten Graul42042db2021-10-16 11:37:44 +02001466 if (aclc->hdr.typev1 != SMC_TYPE_R &&
1467 aclc->hdr.typev1 != SMC_TYPE_D)
Ursula Braund70bf4f2020-09-26 12:44:27 +02001468 return SMC_CLC_DECL_MODEUNSUPP;
1469
Karsten Graul42042db2021-10-16 11:37:44 +02001470 if (aclc->hdr.version >= SMC_V2) {
1471 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1472 !smcr_indicated(ini->smc_type_v2)) ||
1473 (aclc->hdr.typev1 == SMC_TYPE_D &&
1474 !smcd_indicated(ini->smc_type_v2)))
1475 return SMC_CLC_DECL_MODEUNSUPP;
1476 } else {
1477 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1478 !smcr_indicated(ini->smc_type_v1)) ||
1479 (aclc->hdr.typev1 == SMC_TYPE_D &&
1480 !smcd_indicated(ini->smc_type_v1)))
1481 return SMC_CLC_DECL_MODEUNSUPP;
1482 }
1483
Ursula Braund70bf4f2020-09-26 12:44:27 +02001484 return 0;
1485}
1486
Hans Wippel3b2dec22018-05-18 09:34:18 +02001487/* perform steps before actually connecting */
1488static int __smc_connect(struct smc_sock *smc)
Ursula Brauna046d572017-01-09 16:55:16 +01001489{
Guvenc Gulce49407ae2020-12-01 20:20:42 +01001490 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001491 struct smc_clc_msg_accept_confirm_v2 *aclc2;
1492 struct smc_clc_msg_accept_confirm *aclc;
Ursula Braun3fc64932020-09-26 12:44:23 +02001493 struct smc_init_info *ini = NULL;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001494 u8 *buf = NULL;
Ursula Brauna046d572017-01-09 16:55:16 +01001495 int rc = 0;
Ursula Brauna046d572017-01-09 16:55:16 +01001496
Ursula Braunee9dfbe2018-04-26 17:18:21 +02001497 if (smc->use_fallback)
Karsten Graul603cc142018-07-25 16:35:32 +02001498 return smc_connect_fallback(smc, smc->fallback_rsn);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02001499
Hans Wippel3b2dec22018-05-18 09:34:18 +02001500 /* if peer has not signalled SMC-capability, fall back */
1501 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
Karsten Graul603cc142018-07-25 16:35:32 +02001502 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
Ursula Braunc5c1cc92017-10-25 11:01:46 +02001503
Ursula Braune8d726c82020-09-26 12:44:32 +02001504 /* IPSec connections opt out of SMC optimizations */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001505 if (using_ipsec(smc))
Ursula Braune8d726c82020-09-26 12:44:32 +02001506 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1507 version);
Ursula Brauna046d572017-01-09 16:55:16 +01001508
Ursula Braun3fc64932020-09-26 12:44:23 +02001509 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1510 if (!ini)
Ursula Braune8d726c82020-09-26 12:44:32 +02001511 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1512 version);
Ursula Braun3fc64932020-09-26 12:44:23 +02001513
Karsten Graul42042db2021-10-16 11:37:44 +02001514 ini->smcd_version = SMC_V1 | SMC_V2;
1515 ini->smcr_version = SMC_V1 | SMC_V2;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001516 ini->smc_type_v1 = SMC_TYPE_B;
Karsten Graul42042db2021-10-16 11:37:44 +02001517 ini->smc_type_v2 = SMC_TYPE_B;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001518
Karsten Graulfba7e8e2019-04-12 12:57:27 +02001519 /* get vlan id from IP device */
Ursula Braun3fc64932020-09-26 12:44:23 +02001520 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
Ursula Braund70bf4f2020-09-26 12:44:27 +02001521 ini->smcd_version &= ~SMC_V1;
Karsten Graul42042db2021-10-16 11:37:44 +02001522 ini->smcr_version = 0;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001523 ini->smc_type_v1 = SMC_TYPE_N;
1524 if (!ini->smcd_version) {
1525 rc = SMC_CLC_DECL_GETVLANERR;
1526 goto fallback;
1527 }
Ursula Braun3fc64932020-09-26 12:44:23 +02001528 }
Hans Wippel41349842018-06-28 19:05:11 +02001529
Ursula Braund70bf4f2020-09-26 12:44:27 +02001530 rc = smc_find_proposal_devices(smc, ini);
1531 if (rc)
1532 goto fallback;
Ursula Brauna046d572017-01-09 16:55:16 +01001533
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001534 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1535 if (!buf) {
1536 rc = SMC_CLC_DECL_MEM;
1537 goto fallback;
1538 }
1539 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1540 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1541
Hans Wippel3b2dec22018-05-18 09:34:18 +02001542 /* perform CLC handshake */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001543 rc = smc_connect_clc(smc, aclc2, ini);
D. Wythe1ce22042022-02-15 16:24:50 +08001544 if (rc) {
1545 /* -EAGAIN on timeout, see tcp_recvmsg() */
1546 if (rc == -EAGAIN) {
1547 rc = -ETIMEDOUT;
1548 smc->sk.sk_err = ETIMEDOUT;
1549 }
Ursula Braund70bf4f2020-09-26 12:44:27 +02001550 goto vlan_cleanup;
D. Wythe1ce22042022-02-15 16:24:50 +08001551 }
Ursula Braund70bf4f2020-09-26 12:44:27 +02001552
1553 /* check if smc modes and versions of CLC proposal and accept match */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001554 rc = smc_connect_check_aclc(ini, aclc);
Karsten Graul0530bd62020-11-18 22:40:37 +01001555 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001556 if (rc)
1557 goto vlan_cleanup;
Ursula Brauna046d572017-01-09 16:55:16 +01001558
Hans Wippel41349842018-06-28 19:05:11 +02001559 /* depending on previous steps, connect using rdma or ism */
Karsten Graul42042db2021-10-16 11:37:44 +02001560 if (aclc->hdr.typev1 == SMC_TYPE_R) {
1561 ini->smcr_version = version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001562 rc = smc_connect_rdma(smc, aclc, ini);
Karsten Graul42042db2021-10-16 11:37:44 +02001563 } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1564 ini->smcd_version = version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001565 rc = smc_connect_ism(smc, aclc, ini);
Karsten Graul42042db2021-10-16 11:37:44 +02001566 }
Ursula Braund70bf4f2020-09-26 12:44:27 +02001567 if (rc)
1568 goto vlan_cleanup;
Ursula Brauna046d572017-01-09 16:55:16 +01001569
Guvenc Gulce194730a2021-06-16 16:52:58 +02001570 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001571 smc_connect_ism_vlan_cleanup(smc, ini);
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001572 kfree(buf);
Ursula Braun3fc64932020-09-26 12:44:23 +02001573 kfree(ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001574 return 0;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001575
1576vlan_cleanup:
1577 smc_connect_ism_vlan_cleanup(smc, ini);
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001578 kfree(buf);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001579fallback:
1580 kfree(ini);
Ursula Braune8d726c82020-09-26 12:44:32 +02001581 return smc_connect_decline_fallback(smc, rc, version);
Ursula Brauna046d572017-01-09 16:55:16 +01001582}
1583
Ursula Braun24ac3a02018-06-27 17:59:50 +02001584static void smc_connect_work(struct work_struct *work)
1585{
1586 struct smc_sock *smc = container_of(work, struct smc_sock,
1587 connect_work);
Ursula Braun50717a32019-04-12 12:57:23 +02001588 long timeo = smc->sk.sk_sndtimeo;
1589 int rc = 0;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001590
Ursula Braun50717a32019-04-12 12:57:23 +02001591 if (!timeo)
1592 timeo = MAX_SCHEDULE_TIMEOUT;
1593 lock_sock(smc->clcsock->sk);
Ursula Braun24ac3a02018-06-27 17:59:50 +02001594 if (smc->clcsock->sk->sk_err) {
1595 smc->sk.sk_err = smc->clcsock->sk->sk_err;
Ursula Braun50717a32019-04-12 12:57:23 +02001596 } else if ((1 << smc->clcsock->sk->sk_state) &
Wen Guf3a3a0f2021-10-28 15:13:47 +08001597 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
Ursula Braun50717a32019-04-12 12:57:23 +02001598 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1599 if ((rc == -EPIPE) &&
1600 ((1 << smc->clcsock->sk->sk_state) &
1601 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1602 rc = 0;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001603 }
Ursula Braun50717a32019-04-12 12:57:23 +02001604 release_sock(smc->clcsock->sk);
1605 lock_sock(&smc->sk);
1606 if (rc != 0 || smc->sk.sk_err) {
1607 smc->sk.sk_state = SMC_CLOSED;
1608 if (rc == -EPIPE || rc == -EAGAIN)
1609 smc->sk.sk_err = EPIPE;
liuyacan4e2e65e2022-04-21 17:40:27 +08001610 else if (rc == -ECONNREFUSED)
1611 smc->sk.sk_err = ECONNREFUSED;
Ursula Braun50717a32019-04-12 12:57:23 +02001612 else if (signal_pending(current))
1613 smc->sk.sk_err = -sock_intr_errno(timeo);
Ursula Braun6d6dd522019-11-12 16:03:41 +01001614 sock_put(&smc->sk); /* passive closing */
Ursula Braun24ac3a02018-06-27 17:59:50 +02001615 goto out;
1616 }
1617
1618 rc = __smc_connect(smc);
1619 if (rc < 0)
1620 smc->sk.sk_err = -rc;
1621
1622out:
Ursula Braun07603b22019-04-11 11:17:32 +02001623 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1624 if (smc->sk.sk_err) {
1625 smc->sk.sk_state_change(&smc->sk);
1626 } else { /* allow polling before and after fallback decision */
1627 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1628 smc->sk.sk_write_space(&smc->sk);
1629 }
1630 }
Ursula Braun24ac3a02018-06-27 17:59:50 +02001631 release_sock(&smc->sk);
1632}
1633
Ursula Braunac713872017-01-09 16:55:13 +01001634static int smc_connect(struct socket *sock, struct sockaddr *addr,
1635 int alen, int flags)
1636{
1637 struct sock *sk = sock->sk;
1638 struct smc_sock *smc;
1639 int rc = -EINVAL;
1640
1641 smc = smc_sk(sk);
1642
1643 /* separate smc parameter checking to be safe */
1644 if (alen < sizeof(addr->sa_family))
1645 goto out_err;
Karsten Graulaaa4d332018-03-16 15:06:41 +01001646 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
Ursula Braunac713872017-01-09 16:55:13 +01001647 goto out_err;
1648
1649 lock_sock(sk);
Guangguan Wang3aba1032022-05-13 10:24:53 +08001650 switch (sock->state) {
1651 default:
1652 rc = -EINVAL;
1653 goto out;
1654 case SS_CONNECTED:
1655 rc = sk->sk_state == SMC_ACTIVE ? -EISCONN : -EINVAL;
1656 goto out;
1657 case SS_CONNECTING:
1658 if (sk->sk_state == SMC_ACTIVE)
1659 goto connected;
1660 break;
1661 case SS_UNCONNECTED:
1662 sock->state = SS_CONNECTING;
1663 break;
1664 }
1665
Ursula Braunac713872017-01-09 16:55:13 +01001666 switch (sk->sk_state) {
1667 default:
1668 goto out;
Guangguan Wang3aba1032022-05-13 10:24:53 +08001669 case SMC_CLOSED:
1670 rc = sock_error(sk) ? : -ECONNABORTED;
1671 sock->state = SS_UNCONNECTED;
1672 goto out;
Ursula Braunac713872017-01-09 16:55:13 +01001673 case SMC_ACTIVE:
1674 rc = -EISCONN;
1675 goto out;
1676 case SMC_INIT:
Ursula Braunac713872017-01-09 16:55:13 +01001677 break;
1678 }
1679
1680 smc_copy_sock_settings_to_clc(smc);
Ursula Braunc5c1cc92017-10-25 11:01:46 +02001681 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
Ursula Braun50717a32019-04-12 12:57:23 +02001682 if (smc->connect_nonblock) {
1683 rc = -EALREADY;
1684 goto out;
1685 }
1686 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1687 if (rc && rc != -EINPROGRESS)
1688 goto out;
Ursula Braun301428e2019-10-29 12:41:26 +01001689
Guangguan Wang3aba1032022-05-13 10:24:53 +08001690 if (smc->use_fallback) {
1691 sock->state = rc ? SS_CONNECTING : SS_CONNECTED;
Ursula Braun86434742019-12-12 22:35:58 +01001692 goto out;
Guangguan Wang3aba1032022-05-13 10:24:53 +08001693 }
liuyacan75c1edf2022-05-23 12:57:07 +08001694 sock_hold(&smc->sk); /* sock put in passive closing */
Ursula Braun24ac3a02018-06-27 17:59:50 +02001695 if (flags & O_NONBLOCK) {
Karsten Graul22ef4732020-09-10 18:48:29 +02001696 if (queue_work(smc_hs_wq, &smc->connect_work))
Ursula Braun50717a32019-04-12 12:57:23 +02001697 smc->connect_nonblock = 1;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001698 rc = -EINPROGRESS;
Guangguan Wang3aba1032022-05-13 10:24:53 +08001699 goto out;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001700 } else {
Ursula Braun24ac3a02018-06-27 17:59:50 +02001701 rc = __smc_connect(smc);
1702 if (rc < 0)
1703 goto out;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001704 }
Ursula Braunac713872017-01-09 16:55:13 +01001705
Guangguan Wang3aba1032022-05-13 10:24:53 +08001706connected:
1707 rc = 0;
1708 sock->state = SS_CONNECTED;
Ursula Braunac713872017-01-09 16:55:13 +01001709out:
1710 release_sock(sk);
1711out_err:
1712 return rc;
1713}
1714
1715static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1716{
Ursula Braun3163c502018-01-24 10:28:12 +01001717 struct socket *new_clcsock = NULL;
1718 struct sock *lsk = &lsmc->sk;
Ursula Braunac713872017-01-09 16:55:13 +01001719 struct sock *new_sk;
Myungho Jung78abe3d2018-12-18 09:02:25 -08001720 int rc = -EINVAL;
Ursula Braunac713872017-01-09 16:55:13 +01001721
Ursula Braun3163c502018-01-24 10:28:12 +01001722 release_sock(lsk);
Karsten Graulaaa4d332018-03-16 15:06:41 +01001723 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
Ursula Braunac713872017-01-09 16:55:13 +01001724 if (!new_sk) {
1725 rc = -ENOMEM;
Ursula Braun3163c502018-01-24 10:28:12 +01001726 lsk->sk_err = ENOMEM;
Ursula Braunac713872017-01-09 16:55:13 +01001727 *new_smc = NULL;
Ursula Braun3163c502018-01-24 10:28:12 +01001728 lock_sock(lsk);
Ursula Braunac713872017-01-09 16:55:13 +01001729 goto out;
1730 }
1731 *new_smc = smc_sk(new_sk);
1732
Myungho Jung78abe3d2018-12-18 09:02:25 -08001733 mutex_lock(&lsmc->clcsock_release_lock);
1734 if (lsmc->clcsock)
Ursula Brauna60a2b12020-09-10 18:48:20 +02001735 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
Myungho Jung78abe3d2018-12-18 09:02:25 -08001736 mutex_unlock(&lsmc->clcsock_release_lock);
Ursula Braun3163c502018-01-24 10:28:12 +01001737 lock_sock(lsk);
Ursula Brauna60a2b12020-09-10 18:48:20 +02001738 if (rc < 0 && rc != -EAGAIN)
Ursula Braun3163c502018-01-24 10:28:12 +01001739 lsk->sk_err = -rc;
Ursula Braun35a6b172018-01-24 10:28:13 +01001740 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
Ursula Braunf61bca52019-04-11 11:17:34 +02001741 new_sk->sk_prot->unhash(new_sk);
Ursula Brauna046d572017-01-09 16:55:16 +01001742 if (new_clcsock)
1743 sock_release(new_clcsock);
1744 new_sk->sk_state = SMC_CLOSED;
1745 sock_set_flag(new_sk, SOCK_DEAD);
Ursula Braun51f1de72018-01-26 09:28:48 +01001746 sock_put(new_sk); /* final */
Ursula Braunac713872017-01-09 16:55:13 +01001747 *new_smc = NULL;
1748 goto out;
1749 }
1750
Ursula Brauna60a2b12020-09-10 18:48:20 +02001751 /* new clcsock has inherited the smc listen-specific sk_data_ready
1752 * function; switch it back to the original sk_data_ready function
1753 */
1754 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
Wen Gu97b9af72022-04-22 15:56:18 +08001755
1756 /* if new clcsock has also inherited the fallback-specific callback
1757 * functions, switch them back to the original ones.
1758 */
1759 if (lsmc->use_fallback) {
1760 if (lsmc->clcsk_state_change)
1761 new_clcsock->sk->sk_state_change = lsmc->clcsk_state_change;
1762 if (lsmc->clcsk_write_space)
1763 new_clcsock->sk->sk_write_space = lsmc->clcsk_write_space;
1764 if (lsmc->clcsk_error_report)
1765 new_clcsock->sk->sk_error_report = lsmc->clcsk_error_report;
1766 }
1767
Ursula Braunac713872017-01-09 16:55:13 +01001768 (*new_smc)->clcsock = new_clcsock;
1769out:
1770 return rc;
1771}
1772
Ursula Brauna046d572017-01-09 16:55:16 +01001773/* add a just created sock to the accept queue of the listen sock as
1774 * candidate for a following socket accept call from user space
1775 */
1776static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1777{
1778 struct smc_sock *par = smc_sk(parent);
1779
Ursula Braun51f1de72018-01-26 09:28:48 +01001780 sock_hold(sk); /* sock_put in smc_accept_unlink () */
Ursula Brauna046d572017-01-09 16:55:16 +01001781 spin_lock(&par->accept_q_lock);
1782 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1783 spin_unlock(&par->accept_q_lock);
1784 sk_acceptq_added(parent);
1785}
1786
1787/* remove a socket from the accept queue of its parental listening socket */
1788static void smc_accept_unlink(struct sock *sk)
1789{
1790 struct smc_sock *par = smc_sk(sk)->listen_smc;
1791
1792 spin_lock(&par->accept_q_lock);
1793 list_del_init(&smc_sk(sk)->accept_q);
1794 spin_unlock(&par->accept_q_lock);
1795 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
Ursula Braun51f1de72018-01-26 09:28:48 +01001796 sock_put(sk); /* sock_hold in smc_accept_enqueue */
Ursula Brauna046d572017-01-09 16:55:16 +01001797}
1798
1799/* remove a sock from the accept queue to bind it to a new socket created
1800 * for a socket accept call from user space
1801 */
Ursula Braunb38d7322017-01-09 16:55:25 +01001802struct sock *smc_accept_dequeue(struct sock *parent,
1803 struct socket *new_sock)
Ursula Brauna046d572017-01-09 16:55:16 +01001804{
1805 struct smc_sock *isk, *n;
1806 struct sock *new_sk;
1807
1808 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1809 new_sk = (struct sock *)isk;
1810
1811 smc_accept_unlink(new_sk);
1812 if (new_sk->sk_state == SMC_CLOSED) {
Ursula Braunf61bca52019-04-11 11:17:34 +02001813 new_sk->sk_prot->unhash(new_sk);
Ursula Braun127f4972018-01-26 09:28:49 +01001814 if (isk->clcsock) {
1815 sock_release(isk->clcsock);
1816 isk->clcsock = NULL;
1817 }
Ursula Braun51f1de72018-01-26 09:28:48 +01001818 sock_put(new_sk); /* final */
Ursula Brauna046d572017-01-09 16:55:16 +01001819 continue;
1820 }
Ursula Braun07603b22019-04-11 11:17:32 +02001821 if (new_sock) {
Ursula Brauna046d572017-01-09 16:55:16 +01001822 sock_graft(new_sk, new_sock);
Guangguan Wang3aba1032022-05-13 10:24:53 +08001823 new_sock->state = SS_CONNECTED;
Ursula Braun07603b22019-04-11 11:17:32 +02001824 if (isk->use_fallback) {
1825 smc_sk(new_sk)->clcsock->file = new_sock->file;
1826 isk->clcsock->file->private_data = isk->clcsock;
1827 }
1828 }
Ursula Brauna046d572017-01-09 16:55:16 +01001829 return new_sk;
1830 }
1831 return NULL;
1832}
1833
1834/* clean up for a created but never accepted sock */
Ursula Braunb38d7322017-01-09 16:55:25 +01001835void smc_close_non_accepted(struct sock *sk)
Ursula Brauna046d572017-01-09 16:55:16 +01001836{
1837 struct smc_sock *smc = smc_sk(sk);
1838
Ursula Braun81cf4f42019-10-21 16:13:15 +02001839 sock_hold(sk); /* sock_put below */
Ursula Braunb38d7322017-01-09 16:55:25 +01001840 lock_sock(sk);
1841 if (!sk->sk_lingertime)
1842 /* wait for peer closing */
Eric Dumazetbc1fb822023-08-19 04:06:46 +00001843 WRITE_ONCE(sk->sk_lingertime, SMC_MAX_STREAM_WAIT_TIMEOUT);
Ursula Braun39f41f32019-06-27 15:04:52 +02001844 __smc_release(smc);
Ursula Braunb38d7322017-01-09 16:55:25 +01001845 release_sock(sk);
Ursula Braun81cf4f42019-10-21 16:13:15 +02001846 sock_put(sk); /* sock_hold above */
Ursula Braun51f1de72018-01-26 09:28:48 +01001847 sock_put(sk); /* final sock_put */
Ursula Brauna046d572017-01-09 16:55:16 +01001848}
1849
Karsten Graulb9247542020-04-29 17:10:41 +02001850static int smcr_serv_conf_first_link(struct smc_sock *smc)
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001851{
Karsten Graul387707f2020-04-29 17:10:40 +02001852 struct smc_link *link = smc->conn.lnk;
Karsten Graul4667bb42020-04-30 15:55:42 +02001853 struct smc_llc_qentry *qentry;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001854 int rc;
1855
Wen Gub8d19942022-07-14 17:44:04 +08001856 /* reg the sndbuf if it was vzalloced*/
1857 if (smc->conn.sndbuf_desc->is_vm) {
1858 if (smcr_link_reg_buf(link, smc->conn.sndbuf_desc))
1859 return SMC_CLC_DECL_ERR_REGBUF;
1860 }
1861
1862 /* reg the rmb */
1863 if (smcr_link_reg_buf(link, smc->conn.rmb_desc))
1864 return SMC_CLC_DECL_ERR_REGBUF;
Ursula Braun652a1e42017-07-28 13:56:17 +02001865
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001866 /* send CONFIRM LINK request to client over the RoCE fabric */
Ursula Braun947541f2018-07-25 16:35:30 +02001867 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001868 if (rc < 0)
Karsten Graul603cc142018-07-25 16:35:32 +02001869 return SMC_CLC_DECL_TIMEOUT_CL;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001870
1871 /* receive CONFIRM LINK response from client over the RoCE fabric */
Karsten Graul4667bb42020-04-30 15:55:42 +02001872 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1873 SMC_LLC_CONFIRM_LINK);
1874 if (!qentry) {
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001875 struct smc_clc_msg_decline dclc;
1876
1877 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
Ursula Braun2b59f582018-11-22 10:26:39 +01001878 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
Ursula Braun9ed28552018-11-22 10:26:37 +01001879 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001880 }
Karsten Graul649758f2020-05-04 14:18:48 +02001881 smc_llc_save_peer_uid(qentry);
Karsten Graul4667bb42020-04-30 15:55:42 +02001882 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1883 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1884 if (rc)
Karsten Graul75d320d2018-03-01 13:51:31 +01001885 return SMC_CLC_DECL_RMBE_EC;
1886
Karsten Graul4667bb42020-04-30 15:55:42 +02001887 /* confirm_rkey is implicit on 1st contact */
1888 smc->conn.rmb_desc->is_conf_rkey = true;
Karsten Graul52bedf32018-03-01 13:51:32 +01001889
Karsten Graul00a049c2020-04-29 17:10:49 +02001890 smc_llc_link_active(link);
Karsten Graul0a99be42020-05-05 15:01:20 +02001891 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
Karsten Graul52bedf32018-03-01 13:51:32 +01001892
Guangguan Wang69b888e2023-08-17 21:20:31 +08001893 if (link->lgr->max_links > 1) {
1894 down_write(&link->lgr->llc_conf_mutex);
1895 /* initial contact - try to establish second link */
1896 smc_llc_srv_add_link(link, NULL);
1897 up_write(&link->lgr->llc_conf_mutex);
1898 }
Karsten Graul75d320d2018-03-01 13:51:31 +01001899 return 0;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001900}
1901
Hans Wippel3b2dec22018-05-18 09:34:18 +02001902/* listen worker: finish */
1903static void smc_listen_out(struct smc_sock *new_smc)
Ursula Brauna046d572017-01-09 16:55:16 +01001904{
Ursula Brauna046d572017-01-09 16:55:16 +01001905 struct smc_sock *lsmc = new_smc->listen_smc;
Ursula Brauna046d572017-01-09 16:55:16 +01001906 struct sock *newsmcsk = &new_smc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01001907
D. Wythe8270d9c2022-02-10 17:11:35 +08001908 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
1909 atomic_dec(&lsmc->queued_smc_hs);
1910
Ursula Brauna046d572017-01-09 16:55:16 +01001911 if (lsmc->sk.sk_state == SMC_LISTEN) {
Karsten Graulfd577702019-04-11 11:17:30 +02001912 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
Ursula Brauna046d572017-01-09 16:55:16 +01001913 smc_accept_enqueue(&lsmc->sk, newsmcsk);
Karsten Graulfd577702019-04-11 11:17:30 +02001914 release_sock(&lsmc->sk);
Ursula Brauna046d572017-01-09 16:55:16 +01001915 } else { /* no longer listening */
1916 smc_close_non_accepted(newsmcsk);
1917 }
Ursula Brauna046d572017-01-09 16:55:16 +01001918
1919 /* Wake up accept */
1920 lsmc->sk.sk_data_ready(&lsmc->sk);
1921 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001922}
Ursula Brauna046d572017-01-09 16:55:16 +01001923
Hans Wippel3b2dec22018-05-18 09:34:18 +02001924/* listen worker: finish in state connected */
1925static void smc_listen_out_connected(struct smc_sock *new_smc)
1926{
1927 struct sock *newsmcsk = &new_smc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01001928
Hans Wippel3b2dec22018-05-18 09:34:18 +02001929 if (newsmcsk->sk_state == SMC_INIT)
1930 newsmcsk->sk_state = SMC_ACTIVE;
1931
1932 smc_listen_out(new_smc);
1933}
1934
1935/* listen worker: finish in error state */
1936static void smc_listen_out_err(struct smc_sock *new_smc)
1937{
1938 struct sock *newsmcsk = &new_smc->sk;
Guvenc Gulce194730a2021-06-16 16:52:58 +02001939 struct net *net = sock_net(newsmcsk);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001940
Guvenc Gulce194730a2021-06-16 16:52:58 +02001941 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
Ursula Braun51f1de72018-01-26 09:28:48 +01001942 if (newsmcsk->sk_state == SMC_INIT)
1943 sock_put(&new_smc->sk); /* passive closing */
Ursula Brauna046d572017-01-09 16:55:16 +01001944 newsmcsk->sk_state = SMC_CLOSED;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001945
1946 smc_listen_out(new_smc);
1947}
1948
1949/* listen worker: decline and fall back if possible */
1950static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
Karsten Graul4a9baf42020-10-23 20:48:28 +02001951 int local_first, u8 version)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001952{
1953 /* RDMA setup failed, switch back to TCP */
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001954 smc_conn_abort(new_smc, local_first);
Wen Guc0bf3d82022-01-22 17:43:09 +08001955 if (reason_code < 0 ||
1956 smc_switch_to_fallback(new_smc, reason_code)) {
1957 /* error, no fallback possible */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001958 smc_listen_out_err(new_smc);
1959 return;
1960 }
Karsten Graul603cc142018-07-25 16:35:32 +02001961 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
Ursula Braune8d726c82020-09-26 12:44:32 +02001962 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
Hans Wippel3b2dec22018-05-18 09:34:18 +02001963 smc_listen_out_err(new_smc);
1964 return;
1965 }
1966 }
1967 smc_listen_out_connected(new_smc);
1968}
1969
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001970/* listen worker: version checking */
1971static int smc_listen_v2_check(struct smc_sock *new_smc,
1972 struct smc_clc_msg_proposal *pclc,
1973 struct smc_init_info *ini)
1974{
1975 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1976 struct smc_clc_v2_extension *pclc_v2_ext;
Karsten Graul37524042020-10-31 19:19:38 +01001977 int rc = SMC_CLC_DECL_PEERNOSMC;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001978
1979 ini->smc_type_v1 = pclc->hdr.typev1;
1980 ini->smc_type_v2 = pclc->hdr.typev2;
Karsten Graule49300a2021-10-16 11:37:46 +02001981 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1982 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1983 if (pclc->hdr.version > SMC_V1) {
1984 if (smcd_indicated(ini->smc_type_v2))
1985 ini->smcd_version |= SMC_V2;
1986 if (smcr_indicated(ini->smc_type_v2))
1987 ini->smcr_version |= SMC_V2;
Karsten Graul37524042020-10-31 19:19:38 +01001988 }
Karsten Graule49300a2021-10-16 11:37:46 +02001989 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1990 rc = SMC_CLC_DECL_PEERNOSMC;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001991 goto out;
1992 }
1993 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1994 if (!pclc_v2_ext) {
1995 ini->smcd_version &= ~SMC_V2;
Karsten Graule49300a2021-10-16 11:37:46 +02001996 ini->smcr_version &= ~SMC_V2;
Karsten Graul37524042020-10-31 19:19:38 +01001997 rc = SMC_CLC_DECL_NOV2EXT;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001998 goto out;
1999 }
2000 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
Karsten Graule49300a2021-10-16 11:37:46 +02002001 if (ini->smcd_version & SMC_V2) {
2002 if (!smc_ism_is_v2_capable()) {
2003 ini->smcd_version &= ~SMC_V2;
2004 rc = SMC_CLC_DECL_NOISM2SUPP;
2005 } else if (!pclc_smcd_v2_ext) {
2006 ini->smcd_version &= ~SMC_V2;
2007 rc = SMC_CLC_DECL_NOV2DEXT;
2008 } else if (!pclc_v2_ext->hdr.eid_cnt &&
2009 !pclc_v2_ext->hdr.flag.seid) {
2010 ini->smcd_version &= ~SMC_V2;
2011 rc = SMC_CLC_DECL_NOUEID;
2012 }
2013 }
2014 if (ini->smcr_version & SMC_V2) {
2015 if (!pclc_v2_ext->hdr.eid_cnt) {
2016 ini->smcr_version &= ~SMC_V2;
2017 rc = SMC_CLC_DECL_NOUEID;
2018 }
Karsten Graul37524042020-10-31 19:19:38 +01002019 }
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002020
Guangguan Wang1e700942023-08-17 21:20:27 +08002021 ini->release_nr = pclc_v2_ext->hdr.flag.release;
2022 if (pclc_v2_ext->hdr.flag.release > SMC_RELEASE)
2023 ini->release_nr = SMC_RELEASE;
2024
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002025out:
Karsten Graule49300a2021-10-16 11:37:46 +02002026 if (!ini->smcd_version && !ini->smcr_version)
Karsten Graul37524042020-10-31 19:19:38 +01002027 return rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002028
2029 return 0;
2030}
2031
Hans Wippel3b2dec22018-05-18 09:34:18 +02002032/* listen worker: check prefixes */
Karsten Graul59886692019-04-12 12:57:25 +02002033static int smc_listen_prfx_check(struct smc_sock *new_smc,
Hans Wippel3b2dec22018-05-18 09:34:18 +02002034 struct smc_clc_msg_proposal *pclc)
2035{
2036 struct smc_clc_msg_proposal_prefix *pclc_prfx;
2037 struct socket *newclcsock = new_smc->clcsock;
2038
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002039 if (pclc->hdr.typev1 == SMC_TYPE_N)
2040 return 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002041 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
2042 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
Karsten Graul59886692019-04-12 12:57:25 +02002043 return SMC_CLC_DECL_DIFFPREFIX;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002044
2045 return 0;
2046}
2047
2048/* listen worker: initialize connection and buffers */
2049static int smc_listen_rdma_init(struct smc_sock *new_smc,
Karsten Graul7a62725a2019-04-12 12:57:30 +02002050 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02002051{
Karsten Graul7a62725a2019-04-12 12:57:30 +02002052 int rc;
2053
Hans Wippel3b2dec22018-05-18 09:34:18 +02002054 /* allocate connection / link group */
Karsten Graul7a62725a2019-04-12 12:57:30 +02002055 rc = smc_conn_create(new_smc, ini);
2056 if (rc)
2057 return rc;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002058
2059 /* create send buffer and rmb */
Wen Gu35112272023-05-18 13:14:55 +08002060 if (smc_buf_create(new_smc, false)) {
2061 smc_conn_abort(new_smc, ini->first_contact_local);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002062 return SMC_CLC_DECL_MEM;
Wen Gu35112272023-05-18 13:14:55 +08002063 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02002064
2065 return 0;
2066}
2067
Hans Wippel41349842018-06-28 19:05:11 +02002068/* listen worker: initialize connection and buffers for SMC-D */
2069static int smc_listen_ism_init(struct smc_sock *new_smc,
Karsten Graul7a62725a2019-04-12 12:57:30 +02002070 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02002071{
Karsten Graul7a62725a2019-04-12 12:57:30 +02002072 int rc;
Hans Wippel41349842018-06-28 19:05:11 +02002073
Karsten Graul7a62725a2019-04-12 12:57:30 +02002074 rc = smc_conn_create(new_smc, ini);
2075 if (rc)
2076 return rc;
Hans Wippel41349842018-06-28 19:05:11 +02002077
Hans Wippel41349842018-06-28 19:05:11 +02002078 /* Create send and receive buffers */
Karsten Graul72b7f6c2020-07-26 20:34:28 +02002079 rc = smc_buf_create(new_smc, true);
2080 if (rc) {
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01002081 smc_conn_abort(new_smc, ini->first_contact_local);
Karsten Graul72b7f6c2020-07-26 20:34:28 +02002082 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
2083 SMC_CLC_DECL_MEM;
Hans Wippel41349842018-06-28 19:05:11 +02002084 }
2085
2086 return 0;
2087}
2088
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002089static bool smc_is_already_selected(struct smcd_dev *smcd,
2090 struct smc_init_info *ini,
2091 int matches)
2092{
2093 int i;
2094
2095 for (i = 0; i < matches; i++)
2096 if (smcd == ini->ism_dev[i])
2097 return true;
2098
2099 return false;
2100}
2101
2102/* check for ISM devices matching proposed ISM devices */
2103static void smc_check_ism_v2_match(struct smc_init_info *ini,
2104 u16 proposed_chid, u64 proposed_gid,
2105 unsigned int *matches)
2106{
2107 struct smcd_dev *smcd;
2108
2109 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2110 if (smcd->going_away)
2111 continue;
2112 if (smc_is_already_selected(smcd, ini, *matches))
2113 continue;
2114 if (smc_ism_get_chid(smcd) == proposed_chid &&
2115 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
2116 ini->ism_peer_gid[*matches] = proposed_gid;
2117 ini->ism_dev[*matches] = smcd;
2118 (*matches)++;
2119 break;
2120 }
2121 }
2122}
2123
Karsten Graul37524042020-10-31 19:19:38 +01002124static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
2125{
2126 if (!ini->rc)
2127 ini->rc = rc;
2128}
2129
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002130static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
2131 struct smc_clc_msg_proposal *pclc,
2132 struct smc_init_info *ini)
2133{
2134 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
2135 struct smc_clc_v2_extension *smc_v2_ext;
2136 struct smc_clc_msg_smcd *pclc_smcd;
2137 unsigned int matches = 0;
Karsten Graulf29fa002020-10-07 22:57:43 +02002138 u8 smcd_version;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002139 u8 *eid = NULL;
Karsten Graul37524042020-10-31 19:19:38 +01002140 int i, rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002141
2142 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
Karsten Graulf29fa002020-10-07 22:57:43 +02002143 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002144
2145 pclc_smcd = smc_get_clc_msg_smcd(pclc);
2146 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2147 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002148
2149 mutex_lock(&smcd_dev_list.mutex);
2150 if (pclc_smcd->ism.chid)
2151 /* check for ISM device matching proposed native ISM device */
2152 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
2153 ntohll(pclc_smcd->ism.gid), &matches);
2154 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
2155 /* check for ISM devices matching proposed non-native ISM
2156 * devices
2157 */
2158 smc_check_ism_v2_match(ini,
2159 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
2160 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
2161 &matches);
2162 }
2163 mutex_unlock(&smcd_dev_list.mutex);
2164
Karsten Graule49300a2021-10-16 11:37:46 +02002165 if (!ini->ism_dev[0]) {
2166 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002167 goto not_found;
Karsten Graule49300a2021-10-16 11:37:46 +02002168 }
Karsten Graulfa086662021-09-14 10:35:05 +02002169
Karsten Graul11a26c52021-09-14 10:35:06 +02002170 smc_ism_get_system_eid(&eid);
Karsten Graulfa086662021-09-14 10:35:05 +02002171 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
2172 smcd_v2_ext->system_eid, eid))
2173 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002174
2175 /* separate - outside the smcd_dev_list.lock */
Karsten Graulf29fa002020-10-07 22:57:43 +02002176 smcd_version = ini->smcd_version;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002177 for (i = 0; i < matches; i++) {
2178 ini->smcd_version = SMC_V2;
2179 ini->is_smcd = true;
2180 ini->ism_selected = i;
Karsten Graul37524042020-10-31 19:19:38 +01002181 rc = smc_listen_ism_init(new_smc, ini);
2182 if (rc) {
2183 smc_find_ism_store_rc(rc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002184 /* try next active ISM device */
2185 continue;
Karsten Graul37524042020-10-31 19:19:38 +01002186 }
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002187 return; /* matching and usable V2 ISM device found */
2188 }
Karsten Graulf29fa002020-10-07 22:57:43 +02002189 /* no V2 ISM device could be initialized */
2190 ini->smcd_version = smcd_version; /* restore original value */
Karsten Graulfa086662021-09-14 10:35:05 +02002191 ini->negotiated_eid[0] = 0;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002192
2193not_found:
2194 ini->smcd_version &= ~SMC_V2;
2195 ini->ism_dev[0] = NULL;
2196 ini->is_smcd = false;
2197}
2198
2199static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
2200 struct smc_clc_msg_proposal *pclc,
2201 struct smc_init_info *ini)
Ursula Braun7affc802020-09-26 12:44:21 +02002202{
2203 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
Karsten Graul37524042020-10-31 19:19:38 +01002204 int rc = 0;
Ursula Braun7affc802020-09-26 12:44:21 +02002205
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002206 /* check if ISM V1 is available */
2207 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
Ursula Braun7affc802020-09-26 12:44:21 +02002208 goto not_found;
2209 ini->is_smcd = true; /* prepare ISM check */
Ursula Braun8c3dca32020-09-26 12:44:28 +02002210 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
Karsten Graul37524042020-10-31 19:19:38 +01002211 rc = smc_find_ism_device(new_smc, ini);
2212 if (rc)
Ursula Braun7affc802020-09-26 12:44:21 +02002213 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002214 ini->ism_selected = 0;
Karsten Graul37524042020-10-31 19:19:38 +01002215 rc = smc_listen_ism_init(new_smc, ini);
2216 if (!rc)
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002217 return; /* V1 ISM device found */
Ursula Braun7affc802020-09-26 12:44:21 +02002218
2219not_found:
Karsten Graul37524042020-10-31 19:19:38 +01002220 smc_find_ism_store_rc(rc, ini);
Karsten Graule49300a2021-10-16 11:37:46 +02002221 ini->smcd_version &= ~SMC_V1;
Ursula Braun3fc64932020-09-26 12:44:23 +02002222 ini->ism_dev[0] = NULL;
Ursula Braun7affc802020-09-26 12:44:21 +02002223 ini->is_smcd = false;
2224}
2225
Hans Wippel3b2dec22018-05-18 09:34:18 +02002226/* listen worker: register buffers */
Ursula Braun5ac54d82020-09-10 18:48:21 +02002227static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
Hans Wippel3b2dec22018-05-18 09:34:18 +02002228{
Karsten Graulb9247542020-04-29 17:10:41 +02002229 struct smc_connection *conn = &new_smc->conn;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002230
Ursula Braun5ac54d82020-09-10 18:48:21 +02002231 if (!local_first) {
Wen Gub8d19942022-07-14 17:44:04 +08002232 /* reg sendbufs if they were vzalloced */
2233 if (conn->sndbuf_desc->is_vm) {
2234 if (smcr_lgr_reg_sndbufs(conn->lnk,
2235 conn->sndbuf_desc))
2236 return SMC_CLC_DECL_ERR_REGBUF;
2237 }
Karsten Graul7562a132020-05-01 12:48:01 +02002238 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
Wen Gub8d19942022-07-14 17:44:04 +08002239 return SMC_CLC_DECL_ERR_REGBUF;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002240 }
Hans Wippel3b2dec22018-05-18 09:34:18 +02002241
2242 return 0;
2243}
2244
liuyacan9029ac032022-05-24 17:02:30 +08002245static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
2246 struct smc_clc_msg_proposal *pclc,
2247 struct smc_init_info *ini)
Karsten Graule49300a2021-10-16 11:37:46 +02002248{
2249 struct smc_clc_v2_extension *smc_v2_ext;
2250 u8 smcr_version;
liuyacan9029ac032022-05-24 17:02:30 +08002251 int rc;
Karsten Graule49300a2021-10-16 11:37:46 +02002252
2253 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
2254 goto not_found;
2255
2256 smc_v2_ext = smc_get_clc_v2_ext(pclc);
2257 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
2258 goto not_found;
2259
2260 /* prepare RDMA check */
2261 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2262 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
2263 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
2264 ini->check_smcrv2 = true;
2265 ini->smcrv2.clc_sk = new_smc->clcsock->sk;
2266 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
2267 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
2268 rc = smc_find_rdma_device(new_smc, ini);
liuyacan9029ac032022-05-24 17:02:30 +08002269 if (rc) {
2270 smc_find_ism_store_rc(rc, ini);
Karsten Graule49300a2021-10-16 11:37:46 +02002271 goto not_found;
liuyacan9029ac032022-05-24 17:02:30 +08002272 }
Karsten Graule49300a2021-10-16 11:37:46 +02002273 if (!ini->smcrv2.uses_gateway)
2274 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
2275
2276 smcr_version = ini->smcr_version;
2277 ini->smcr_version = SMC_V2;
2278 rc = smc_listen_rdma_init(new_smc, ini);
Wen Gu35112272023-05-18 13:14:55 +08002279 if (!rc) {
liuyacan9029ac032022-05-24 17:02:30 +08002280 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
Wen Gu35112272023-05-18 13:14:55 +08002281 if (rc)
2282 smc_conn_abort(new_smc, ini->first_contact_local);
2283 }
liuyacan9029ac032022-05-24 17:02:30 +08002284 if (!rc)
2285 return;
2286 ini->smcr_version = smcr_version;
2287 smc_find_ism_store_rc(rc, ini);
Karsten Graule49300a2021-10-16 11:37:46 +02002288
2289not_found:
2290 ini->smcr_version &= ~SMC_V2;
liuyacanb3b1a172022-05-25 16:54:08 +08002291 ini->smcrv2.ib_dev_v2 = NULL;
Karsten Graule49300a2021-10-16 11:37:46 +02002292 ini->check_smcrv2 = false;
2293}
2294
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002295static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
2296 struct smc_clc_msg_proposal *pclc,
2297 struct smc_init_info *ini)
Ursula Braun7affc802020-09-26 12:44:21 +02002298{
2299 int rc;
2300
Karsten Graule49300a2021-10-16 11:37:46 +02002301 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
Ursula Braun7affc802020-09-26 12:44:21 +02002302 return SMC_CLC_DECL_NOSMCDEV;
2303
2304 /* prepare RDMA check */
Karsten Graule49300a2021-10-16 11:37:46 +02002305 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
2306 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
2307 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
Ursula Braun7affc802020-09-26 12:44:21 +02002308 rc = smc_find_rdma_device(new_smc, ini);
2309 if (rc) {
2310 /* no RDMA device found */
Karsten Graule49300a2021-10-16 11:37:46 +02002311 return SMC_CLC_DECL_NOSMCDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02002312 }
2313 rc = smc_listen_rdma_init(new_smc, ini);
2314 if (rc)
2315 return rc;
2316 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
2317}
2318
2319/* determine the local device matching to proposal */
2320static int smc_listen_find_device(struct smc_sock *new_smc,
2321 struct smc_clc_msg_proposal *pclc,
2322 struct smc_init_info *ini)
2323{
Karsten Graule49300a2021-10-16 11:37:46 +02002324 int prfx_rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002325
2326 /* check for ISM device matching V2 proposed device */
2327 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
2328 if (ini->ism_dev[0])
Ursula Braun7affc802020-09-26 12:44:21 +02002329 return 0;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002330
Karsten Graule49300a2021-10-16 11:37:46 +02002331 /* check for matching IP prefix and subnet length (V1) */
2332 prfx_rc = smc_listen_prfx_check(new_smc, pclc);
2333 if (prfx_rc)
2334 smc_find_ism_store_rc(prfx_rc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002335
2336 /* get vlan id from IP device */
2337 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
Karsten Graul37524042020-10-31 19:19:38 +01002338 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002339
2340 /* check for ISM device matching V1 proposed device */
Karsten Graule49300a2021-10-16 11:37:46 +02002341 if (!prfx_rc)
2342 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002343 if (ini->ism_dev[0])
2344 return 0;
2345
Karsten Graule49300a2021-10-16 11:37:46 +02002346 if (!smcr_indicated(pclc->hdr.typev1) &&
2347 !smcr_indicated(pclc->hdr.typev2))
Karsten Graul37524042020-10-31 19:19:38 +01002348 /* skip RDMA and decline */
2349 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02002350
Karsten Graule49300a2021-10-16 11:37:46 +02002351 /* check if RDMA V2 is available */
liuyacan9029ac032022-05-24 17:02:30 +08002352 smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
2353 if (ini->smcrv2.ib_dev_v2)
Karsten Graule49300a2021-10-16 11:37:46 +02002354 return 0;
Karsten Graul37524042020-10-31 19:19:38 +01002355
Karsten Graule49300a2021-10-16 11:37:46 +02002356 /* check if RDMA V1 is available */
2357 if (!prfx_rc) {
liuyacan9029ac032022-05-24 17:02:30 +08002358 int rc;
2359
Karsten Graule49300a2021-10-16 11:37:46 +02002360 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
2361 smc_find_ism_store_rc(rc, ini);
2362 return (!rc) ? 0 : ini->rc;
2363 }
2364 return SMC_CLC_DECL_NOSMCDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02002365}
2366
Hans Wippel3b2dec22018-05-18 09:34:18 +02002367/* listen worker: finish RDMA setup */
Ursula Braun1ca52fc2018-09-18 15:46:35 +02002368static int smc_listen_rdma_finish(struct smc_sock *new_smc,
2369 struct smc_clc_msg_accept_confirm *cclc,
Karsten Graule49300a2021-10-16 11:37:46 +02002370 bool local_first,
2371 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02002372{
Karsten Graul387707f2020-04-29 17:10:40 +02002373 struct smc_link *link = new_smc->conn.lnk;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002374 int reason_code = 0;
2375
Ursula Braun5ac54d82020-09-10 18:48:21 +02002376 if (local_first)
Karsten Graule49300a2021-10-16 11:37:46 +02002377 smc_link_save_peer_info(link, cclc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002378
Ursula Braun0c881ad2020-09-10 18:48:25 +02002379 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
2380 return SMC_CLC_DECL_ERR_RTOK;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002381
Ursula Braun5ac54d82020-09-10 18:48:21 +02002382 if (local_first) {
Ursula Braun0c881ad2020-09-10 18:48:25 +02002383 if (smc_ib_ready_link(link))
2384 return SMC_CLC_DECL_ERR_RDYLNK;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002385 /* QP confirmation over RoCE fabric */
Karsten Graul4667bb42020-04-30 15:55:42 +02002386 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
Karsten Graulb9247542020-04-29 17:10:41 +02002387 reason_code = smcr_serv_conf_first_link(new_smc);
Karsten Graul4667bb42020-04-30 15:55:42 +02002388 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002389 }
Ursula Braun1ca52fc2018-09-18 15:46:35 +02002390 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002391}
2392
Ursula Braun7affc802020-09-26 12:44:21 +02002393/* setup for connection of server */
Hans Wippel3b2dec22018-05-18 09:34:18 +02002394static void smc_listen_work(struct work_struct *work)
2395{
2396 struct smc_sock *new_smc = container_of(work, struct smc_sock,
2397 smc_listen_work);
2398 struct socket *newclcsock = new_smc->clcsock;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002399 struct smc_clc_msg_accept_confirm *cclc;
Ursula Braun6bb14e482020-09-10 18:48:22 +02002400 struct smc_clc_msg_proposal_area *buf;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002401 struct smc_clc_msg_proposal *pclc;
Ursula Braun3fc64932020-09-26 12:44:23 +02002402 struct smc_init_info *ini = NULL;
Karsten Graule49300a2021-10-16 11:37:46 +02002403 u8 proposal_version = SMC_V1;
2404 u8 accept_version;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002405 int rc = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002406
Karsten Graulfd577702019-04-11 11:17:30 +02002407 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
2408 return smc_listen_out_err(new_smc);
2409
Hans Wippel3b2dec22018-05-18 09:34:18 +02002410 if (new_smc->use_fallback) {
2411 smc_listen_out_connected(new_smc);
2412 return;
2413 }
2414
2415 /* check if peer is smc capable */
2416 if (!tcp_sk(newclcsock->sk)->syn_smc) {
Wen Guc0bf3d82022-01-22 17:43:09 +08002417 rc = smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
2418 if (rc)
2419 smc_listen_out_err(new_smc);
2420 else
2421 smc_listen_out_connected(new_smc);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002422 return;
2423 }
2424
2425 /* do inband token exchange -
2426 * wait for and receive SMC Proposal CLC message
2427 */
Ursula Braun6bb14e482020-09-10 18:48:22 +02002428 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
2429 if (!buf) {
2430 rc = SMC_CLC_DECL_MEM;
2431 goto out_decl;
2432 }
2433 pclc = (struct smc_clc_msg_proposal *)buf;
2434 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
Karsten Graul228bae02019-04-12 12:57:28 +02002435 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
Karsten Graul9aa68d22019-04-12 12:57:29 +02002436 if (rc)
2437 goto out_decl;
Karsten Graule49300a2021-10-16 11:37:46 +02002438
2439 if (pclc->hdr.version > SMC_V1)
2440 proposal_version = SMC_V2;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002441
Ursula Braune8d726c82020-09-26 12:44:32 +02002442 /* IPSec connections opt out of SMC optimizations */
Hans Wippel3b2dec22018-05-18 09:34:18 +02002443 if (using_ipsec(new_smc)) {
Karsten Graul9aa68d22019-04-12 12:57:29 +02002444 rc = SMC_CLC_DECL_IPSEC;
2445 goto out_decl;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002446 }
2447
Ursula Braun3fc64932020-09-26 12:44:23 +02002448 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
2449 if (!ini) {
2450 rc = SMC_CLC_DECL_MEM;
2451 goto out_decl;
2452 }
2453
Ursula Braun5c21c4c2020-09-26 12:44:29 +02002454 /* initial version checking */
2455 rc = smc_listen_v2_check(new_smc, pclc, ini);
2456 if (rc)
Karsten Graul9aa68d22019-04-12 12:57:29 +02002457 goto out_decl;
Karsten Graulfba7e8e2019-04-12 12:57:27 +02002458
Guangguan Wang6ac1e6562023-08-17 21:20:29 +08002459 rc = smc_clc_srv_v2x_features_validate(pclc, ini);
2460 if (rc)
2461 goto out_decl;
2462
Hans Wippel72a36a82019-02-07 15:56:18 +01002463 mutex_lock(&smc_server_lgr_pending);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002464 smc_close_init(new_smc);
2465 smc_rx_init(new_smc);
2466 smc_tx_init(new_smc);
2467
Ursula Braun7affc802020-09-26 12:44:21 +02002468 /* determine ISM or RoCE device used for connection */
Ursula Braun3fc64932020-09-26 12:44:23 +02002469 rc = smc_listen_find_device(new_smc, pclc, ini);
Ursula Braun7affc802020-09-26 12:44:21 +02002470 if (rc)
2471 goto out_unlock;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002472
2473 /* send SMC Accept CLC message */
Karsten Graule49300a2021-10-16 11:37:46 +02002474 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002475 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
Guangguan Wang1e700942023-08-17 21:20:27 +08002476 accept_version, ini->negotiated_eid, ini);
Karsten Graul9aa68d22019-04-12 12:57:29 +02002477 if (rc)
2478 goto out_unlock;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002479
Hans Wippel62c71392019-02-07 15:56:17 +01002480 /* SMC-D does not need this lock any more */
Ursula Braun3fc64932020-09-26 12:44:23 +02002481 if (ini->is_smcd)
Hans Wippel72a36a82019-02-07 15:56:18 +01002482 mutex_unlock(&smc_server_lgr_pending);
Hans Wippel62c71392019-02-07 15:56:17 +01002483
Hans Wippel3b2dec22018-05-18 09:34:18 +02002484 /* receive SMC Confirm CLC message */
Karsten Graul9047a617dc2020-10-07 22:57:42 +02002485 memset(buf, 0, sizeof(*buf));
2486 cclc = (struct smc_clc_msg_accept_confirm *)buf;
2487 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
Karsten Graul228bae02019-04-12 12:57:28 +02002488 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2489 if (rc) {
Ursula Braun3fc64932020-09-26 12:44:23 +02002490 if (!ini->is_smcd)
Karsten Graul9aa68d22019-04-12 12:57:29 +02002491 goto out_unlock;
2492 goto out_decl;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002493 }
2494
Guangguan Wang6ac1e6562023-08-17 21:20:29 +08002495 rc = smc_clc_v2x_features_confirm_check(cclc, ini);
2496 if (rc) {
2497 if (!ini->is_smcd)
2498 goto out_unlock;
2499 goto out_decl;
2500 }
2501
Guangguan Wang69b888e2023-08-17 21:20:31 +08002502 /* fce smc release version is needed in smc_listen_rdma_finish,
2503 * so save fce info here.
2504 */
2505 smc_conn_save_peer_info_fce(new_smc, cclc);
2506
Hans Wippel3b2dec22018-05-18 09:34:18 +02002507 /* finish worker */
Ursula Braun3fc64932020-09-26 12:44:23 +02002508 if (!ini->is_smcd) {
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002509 rc = smc_listen_rdma_finish(new_smc, cclc,
Karsten Graule49300a2021-10-16 11:37:46 +02002510 ini->first_contact_local, ini);
Hans Wippel62c71392019-02-07 15:56:17 +01002511 if (rc)
Ursula Braun0c881ad2020-09-10 18:48:25 +02002512 goto out_unlock;
2513 mutex_unlock(&smc_server_lgr_pending);
Ursula Braun1ca52fc2018-09-18 15:46:35 +02002514 }
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002515 smc_conn_save_peer_info(new_smc, cclc);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002516 smc_listen_out_connected(new_smc);
Guvenc Gulce194730a2021-06-16 16:52:58 +02002517 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
Ursula Braunac679362020-09-17 22:46:02 +02002518 goto out_free;
Karsten Graul9aa68d22019-04-12 12:57:29 +02002519
2520out_unlock:
2521 mutex_unlock(&smc_server_lgr_pending);
2522out_decl:
Karsten Graul4a9baf42020-10-23 20:48:28 +02002523 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
Karsten Graule49300a2021-10-16 11:37:46 +02002524 proposal_version);
Ursula Braunac679362020-09-17 22:46:02 +02002525out_free:
Ursula Braun3fc64932020-09-26 12:44:23 +02002526 kfree(ini);
Ursula Braun6bb14e482020-09-10 18:48:22 +02002527 kfree(buf);
Ursula Brauna046d572017-01-09 16:55:16 +01002528}
2529
2530static void smc_tcp_listen_work(struct work_struct *work)
2531{
2532 struct smc_sock *lsmc = container_of(work, struct smc_sock,
2533 tcp_listen_work);
Ursula Braun3163c502018-01-24 10:28:12 +01002534 struct sock *lsk = &lsmc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01002535 struct smc_sock *new_smc;
2536 int rc = 0;
2537
Ursula Braun3163c502018-01-24 10:28:12 +01002538 lock_sock(lsk);
2539 while (lsk->sk_state == SMC_LISTEN) {
Ursula Brauna046d572017-01-09 16:55:16 +01002540 rc = smc_clcsock_accept(lsmc, &new_smc);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002541 if (rc) /* clcsock accept queue empty or error */
Ursula Brauna046d572017-01-09 16:55:16 +01002542 goto out;
2543 if (!new_smc)
2544 continue;
2545
D. Wythe8270d9c2022-02-10 17:11:35 +08002546 if (tcp_sk(new_smc->clcsock->sk)->syn_smc)
2547 atomic_inc(&lsmc->queued_smc_hs);
2548
Ursula Brauna046d572017-01-09 16:55:16 +01002549 new_smc->listen_smc = lsmc;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002550 new_smc->use_fallback = lsmc->use_fallback;
Karsten Graul603cc142018-07-25 16:35:32 +02002551 new_smc->fallback_rsn = lsmc->fallback_rsn;
Ursula Braun3163c502018-01-24 10:28:12 +01002552 sock_hold(lsk); /* sock_put in smc_listen_work */
Ursula Brauna046d572017-01-09 16:55:16 +01002553 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2554 smc_copy_sock_settings_to_smc(new_smc);
Ursula Braun51f1de72018-01-26 09:28:48 +01002555 sock_hold(&new_smc->sk); /* sock_put in passive closing */
Karsten Graul22ef4732020-09-10 18:48:29 +02002556 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
Ursula Braun51f1de72018-01-26 09:28:48 +01002557 sock_put(&new_smc->sk);
Ursula Brauna046d572017-01-09 16:55:16 +01002558 }
2559
2560out:
Ursula Braun3163c502018-01-24 10:28:12 +01002561 release_sock(lsk);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002562 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2563}
2564
2565static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2566{
Wen Gu05582262022-04-22 15:56:19 +08002567 struct smc_sock *lsmc;
Ursula Brauna60a2b12020-09-10 18:48:20 +02002568
Wen Gu05582262022-04-22 15:56:19 +08002569 read_lock_bh(&listen_clcsock->sk_callback_lock);
2570 lsmc = smc_clcsock_user_data(listen_clcsock);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002571 if (!lsmc)
Wen Gu05582262022-04-22 15:56:19 +08002572 goto out;
Ursula Brauna60a2b12020-09-10 18:48:20 +02002573 lsmc->clcsk_data_ready(listen_clcsock);
2574 if (lsmc->sk.sk_state == SMC_LISTEN) {
2575 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
D. Wythe3079e342022-02-10 17:11:34 +08002576 if (!queue_work(smc_tcp_ls_wq, &lsmc->tcp_listen_work))
Ursula Brauna60a2b12020-09-10 18:48:20 +02002577 sock_put(&lsmc->sk);
2578 }
Wen Gu05582262022-04-22 15:56:19 +08002579out:
2580 read_unlock_bh(&listen_clcsock->sk_callback_lock);
Ursula Brauna046d572017-01-09 16:55:16 +01002581}
2582
Ursula Braunac713872017-01-09 16:55:13 +01002583static int smc_listen(struct socket *sock, int backlog)
2584{
2585 struct sock *sk = sock->sk;
2586 struct smc_sock *smc;
2587 int rc;
2588
2589 smc = smc_sk(sk);
2590 lock_sock(sk);
2591
2592 rc = -EINVAL;
Ursula Brauncd206362019-08-02 10:47:50 +02002593 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
Guangguan Wang3aba1032022-05-13 10:24:53 +08002594 smc->connect_nonblock || sock->state != SS_UNCONNECTED)
Ursula Braunac713872017-01-09 16:55:13 +01002595 goto out;
2596
2597 rc = 0;
2598 if (sk->sk_state == SMC_LISTEN) {
2599 sk->sk_max_ack_backlog = backlog;
2600 goto out;
2601 }
2602 /* some socket options are handled in core, so we could not apply
2603 * them to the clc socket -- copy smc socket options to clc socket
2604 */
2605 smc_copy_sock_settings_to_clc(smc);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002606 if (!smc->use_fallback)
2607 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
Ursula Braunac713872017-01-09 16:55:13 +01002608
Ursula Brauna60a2b12020-09-10 18:48:20 +02002609 /* save original sk_data_ready function and establish
2610 * smc-specific sk_data_ready function
2611 */
Wen Gu05582262022-04-22 15:56:19 +08002612 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002613 smc->clcsock->sk->sk_user_data =
2614 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
Wen Gu97b9af72022-04-22 15:56:18 +08002615 smc_clcsock_replace_cb(&smc->clcsock->sk->sk_data_ready,
2616 smc_clcsock_data_ready, &smc->clcsk_data_ready);
Wen Gu05582262022-04-22 15:56:19 +08002617 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
D. Wythe8270d9c2022-02-10 17:11:35 +08002618
2619 /* save original ops */
2620 smc->ori_af_ops = inet_csk(smc->clcsock->sk)->icsk_af_ops;
2621
2622 smc->af_ops = *smc->ori_af_ops;
2623 smc->af_ops.syn_recv_sock = smc_tcp_syn_recv_sock;
2624
2625 inet_csk(smc->clcsock->sk)->icsk_af_ops = &smc->af_ops;
2626
D. Wythea6a6fe22022-02-10 17:11:37 +08002627 if (smc->limit_smc_hs)
2628 tcp_sk(smc->clcsock->sk)->smc_hs_congested = smc_hs_congested;
D. Wythe48b61902022-02-10 17:11:36 +08002629
Ursula Braunac713872017-01-09 16:55:13 +01002630 rc = kernel_listen(smc->clcsock, backlog);
Guo DaXing9ebb0c42021-11-24 13:32:38 +01002631 if (rc) {
Wen Gu05582262022-04-22 15:56:19 +08002632 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
Wen Gu97b9af72022-04-22 15:56:18 +08002633 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
2634 &smc->clcsk_data_ready);
2635 smc->clcsock->sk->sk_user_data = NULL;
Wen Gu05582262022-04-22 15:56:19 +08002636 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
Ursula Braunac713872017-01-09 16:55:13 +01002637 goto out;
Guo DaXing9ebb0c42021-11-24 13:32:38 +01002638 }
Ursula Braunac713872017-01-09 16:55:13 +01002639 sk->sk_max_ack_backlog = backlog;
2640 sk->sk_ack_backlog = 0;
2641 sk->sk_state = SMC_LISTEN;
2642
2643out:
2644 release_sock(sk);
2645 return rc;
2646}
2647
2648static int smc_accept(struct socket *sock, struct socket *new_sock,
David Howellscdfbabf2017-03-09 08:09:05 +00002649 int flags, bool kern)
Ursula Braunac713872017-01-09 16:55:13 +01002650{
Ursula Brauna046d572017-01-09 16:55:16 +01002651 struct sock *sk = sock->sk, *nsk;
2652 DECLARE_WAITQUEUE(wait, current);
Ursula Braunac713872017-01-09 16:55:13 +01002653 struct smc_sock *lsmc;
Ursula Brauna046d572017-01-09 16:55:16 +01002654 long timeo;
2655 int rc = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002656
2657 lsmc = smc_sk(sk);
Ursula Braun51f1de72018-01-26 09:28:48 +01002658 sock_hold(sk); /* sock_put below */
Ursula Braunac713872017-01-09 16:55:13 +01002659 lock_sock(sk);
2660
2661 if (lsmc->sk.sk_state != SMC_LISTEN) {
2662 rc = -EINVAL;
Ursula Braunabb190f2018-04-26 17:18:23 +02002663 release_sock(sk);
Ursula Braunac713872017-01-09 16:55:13 +01002664 goto out;
2665 }
2666
Ursula Brauna046d572017-01-09 16:55:16 +01002667 /* Wait for an incoming connection */
2668 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2669 add_wait_queue_exclusive(sk_sleep(sk), &wait);
2670 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2671 set_current_state(TASK_INTERRUPTIBLE);
2672 if (!timeo) {
2673 rc = -EAGAIN;
2674 break;
2675 }
2676 release_sock(sk);
2677 timeo = schedule_timeout(timeo);
2678 /* wakeup by sk_data_ready in smc_listen_work() */
2679 sched_annotate_sleep();
2680 lock_sock(sk);
2681 if (signal_pending(current)) {
2682 rc = sock_intr_errno(timeo);
2683 break;
2684 }
2685 }
2686 set_current_state(TASK_RUNNING);
2687 remove_wait_queue(sk_sleep(sk), &wait);
Ursula Braunac713872017-01-09 16:55:13 +01002688
Ursula Brauna046d572017-01-09 16:55:16 +01002689 if (!rc)
2690 rc = sock_error(nsk);
Ursula Braunabb190f2018-04-26 17:18:23 +02002691 release_sock(sk);
2692 if (rc)
2693 goto out;
2694
2695 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2696 /* wait till data arrives on the socket */
2697 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2698 MSEC_PER_SEC);
2699 if (smc_sk(nsk)->use_fallback) {
2700 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2701
2702 lock_sock(clcsk);
2703 if (skb_queue_empty(&clcsk->sk_receive_queue))
2704 sk_wait_data(clcsk, &timeo, NULL);
2705 release_sock(clcsk);
2706 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2707 lock_sock(nsk);
Stefan Rasplb51fa1b2018-05-03 18:12:37 +02002708 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
Ursula Braunabb190f2018-04-26 17:18:23 +02002709 release_sock(nsk);
2710 }
2711 }
Ursula Braunac713872017-01-09 16:55:13 +01002712
2713out:
Ursula Braun51f1de72018-01-26 09:28:48 +01002714 sock_put(sk); /* sock_hold above */
Ursula Braunac713872017-01-09 16:55:13 +01002715 return rc;
2716}
2717
2718static int smc_getname(struct socket *sock, struct sockaddr *addr,
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01002719 int peer)
Ursula Braunac713872017-01-09 16:55:13 +01002720{
2721 struct smc_sock *smc;
2722
Ursula Braunb38d7322017-01-09 16:55:25 +01002723 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2724 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
Ursula Braunac713872017-01-09 16:55:13 +01002725 return -ENOTCONN;
2726
2727 smc = smc_sk(sock->sk);
2728
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01002729 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
Ursula Braunac713872017-01-09 16:55:13 +01002730}
2731
2732static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2733{
2734 struct sock *sk = sock->sk;
2735 struct smc_sock *smc;
D. Wythece7ca7942023-03-07 11:23:46 +08002736 int rc;
Ursula Braunac713872017-01-09 16:55:13 +01002737
2738 smc = smc_sk(sk);
2739 lock_sock(sk);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002740
D. Wythece7ca7942023-03-07 11:23:46 +08002741 /* SMC does not support connect with fastopen */
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002742 if (msg->msg_flags & MSG_FASTOPEN) {
D. Wythece7ca7942023-03-07 11:23:46 +08002743 /* not connected yet, fallback */
Ursula Brauncd206362019-08-02 10:47:50 +02002744 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
Wen Guc0bf3d82022-01-22 17:43:09 +08002745 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
2746 if (rc)
2747 goto out;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002748 } else {
2749 rc = -EINVAL;
2750 goto out;
2751 }
D. Wythece7ca7942023-03-07 11:23:46 +08002752 } else if ((sk->sk_state != SMC_ACTIVE) &&
2753 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2754 (sk->sk_state != SMC_INIT)) {
2755 rc = -EPIPE;
2756 goto out;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002757 }
2758
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002759 if (smc->use_fallback) {
Ursula Braunac713872017-01-09 16:55:13 +01002760 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002761 } else {
Ursula Braune6727f32017-01-09 16:55:23 +01002762 rc = smc_tx_sendmsg(smc, msg, len);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002763 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2764 }
Ursula Braunac713872017-01-09 16:55:13 +01002765out:
2766 release_sock(sk);
2767 return rc;
2768}
2769
2770static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2771 int flags)
2772{
2773 struct sock *sk = sock->sk;
2774 struct smc_sock *smc;
2775 int rc = -ENOTCONN;
2776
2777 smc = smc_sk(sk);
2778 lock_sock(sk);
Karsten Graul51c5aba2019-01-30 18:51:04 +01002779 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2780 /* socket was connected before, no more data to read */
2781 rc = 0;
2782 goto out;
2783 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002784 if ((sk->sk_state == SMC_INIT) ||
2785 (sk->sk_state == SMC_LISTEN) ||
2786 (sk->sk_state == SMC_CLOSED))
Ursula Braunac713872017-01-09 16:55:13 +01002787 goto out;
2788
Ursula Braunb38d7322017-01-09 16:55:25 +01002789 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2790 rc = 0;
2791 goto out;
2792 }
2793
Stefan Raspl9014db22018-05-03 18:12:39 +02002794 if (smc->use_fallback) {
Ursula Braunac713872017-01-09 16:55:13 +01002795 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
Stefan Raspl9014db22018-05-03 18:12:39 +02002796 } else {
2797 msg->msg_namelen = 0;
2798 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002799 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
Stefan Raspl9014db22018-05-03 18:12:39 +02002800 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002801
Ursula Braunac713872017-01-09 16:55:13 +01002802out:
2803 release_sock(sk);
2804 return rc;
2805}
2806
Al Viroade994f2017-07-03 00:01:49 -04002807static __poll_t smc_accept_poll(struct sock *parent)
Ursula Brauna046d572017-01-09 16:55:16 +01002808{
Ursula Braun8dce2782018-01-26 09:28:47 +01002809 struct smc_sock *isk = smc_sk(parent);
Al Viro63e24802018-02-01 10:02:53 -05002810 __poll_t mask = 0;
Ursula Brauna046d572017-01-09 16:55:16 +01002811
Ursula Braun8dce2782018-01-26 09:28:47 +01002812 spin_lock(&isk->accept_q_lock);
2813 if (!list_empty(&isk->accept_q))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002814 mask = EPOLLIN | EPOLLRDNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002815 spin_unlock(&isk->accept_q_lock);
Ursula Brauna046d572017-01-09 16:55:16 +01002816
Ursula Braun8dce2782018-01-26 09:28:47 +01002817 return mask;
Ursula Brauna046d572017-01-09 16:55:16 +01002818}
2819
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07002820static __poll_t smc_poll(struct file *file, struct socket *sock,
2821 poll_table *wait)
Ursula Braunac713872017-01-09 16:55:13 +01002822{
2823 struct sock *sk = sock->sk;
Ursula Braunac713872017-01-09 16:55:13 +01002824 struct smc_sock *smc;
Ursula Braun50717a32019-04-12 12:57:23 +02002825 __poll_t mask = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002826
Ursula Braun8dce2782018-01-26 09:28:47 +01002827 if (!sk)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002828 return EPOLLNVAL;
Ursula Braun8dce2782018-01-26 09:28:47 +01002829
Ursula Braunac713872017-01-09 16:55:13 +01002830 smc = smc_sk(sock->sk);
Ursula Braun648a5a7a2018-09-18 15:46:34 +02002831 if (smc->use_fallback) {
Ursula Brauna046d572017-01-09 16:55:16 +01002832 /* delegate to CLC child sock */
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07002833 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
Ursula Braun784813a2018-05-02 16:53:56 +02002834 sk->sk_err = smc->clcsock->sk->sk_err;
Ursula Braunac713872017-01-09 16:55:13 +01002835 } else {
Linus Torvalds410da1e2018-07-03 09:53:43 -07002836 if (sk->sk_state != SMC_CLOSED)
Karsten Graul89ab0662018-10-23 13:40:39 +02002837 sock_poll_wait(file, sock, wait);
Ursula Brauna046d572017-01-09 16:55:16 +01002838 if (sk->sk_err)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002839 mask |= EPOLLERR;
Ursula Braunb38d7322017-01-09 16:55:25 +01002840 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2841 (sk->sk_state == SMC_CLOSED))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002842 mask |= EPOLLHUP;
Ursula Braun8dce2782018-01-26 09:28:47 +01002843 if (sk->sk_state == SMC_LISTEN) {
2844 /* woken up by sk_data_ready in smc_listen_work() */
Ursula Braun50717a32019-04-12 12:57:23 +02002845 mask |= smc_accept_poll(sk);
2846 } else if (smc->use_fallback) { /* as result of connect_work()*/
2847 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2848 wait);
2849 sk->sk_err = smc->clcsock->sk->sk_err;
Ursula Braun8dce2782018-01-26 09:28:47 +01002850 } else {
Ursula Braun50717a32019-04-12 12:57:23 +02002851 if ((sk->sk_state != SMC_INIT &&
2852 atomic_read(&smc->conn.sndbuf_space)) ||
Ursula Braun8dce2782018-01-26 09:28:47 +01002853 sk->sk_shutdown & SEND_SHUTDOWN) {
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002854 mask |= EPOLLOUT | EPOLLWRNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002855 } else {
2856 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2857 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2858 }
2859 if (atomic_read(&smc->conn.bytes_to_rcv))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002860 mask |= EPOLLIN | EPOLLRDNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002861 if (sk->sk_shutdown & RCV_SHUTDOWN)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002862 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
Ursula Braun8dce2782018-01-26 09:28:47 +01002863 if (sk->sk_state == SMC_APPCLOSEWAIT1)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002864 mask |= EPOLLIN;
Karsten Graul71d117f2018-09-18 15:46:37 +02002865 if (smc->conn.urg_state == SMC_URG_VALID)
2866 mask |= EPOLLPRI;
Ursula Braun8dce2782018-01-26 09:28:47 +01002867 }
Ursula Braunac713872017-01-09 16:55:13 +01002868 }
2869
2870 return mask;
2871}
2872
2873static int smc_shutdown(struct socket *sock, int how)
2874{
2875 struct sock *sk = sock->sk;
Tony Lubacb6c12021-11-26 10:41:35 +08002876 bool do_shutdown = true;
Ursula Braunac713872017-01-09 16:55:13 +01002877 struct smc_sock *smc;
2878 int rc = -EINVAL;
Tony Lubacb6c12021-11-26 10:41:35 +08002879 int old_state;
Ursula Braunb38d7322017-01-09 16:55:25 +01002880 int rc1 = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002881
2882 smc = smc_sk(sk);
2883
2884 if ((how < SHUT_RD) || (how > SHUT_RDWR))
Ursula Braunb38d7322017-01-09 16:55:25 +01002885 return rc;
Ursula Braunac713872017-01-09 16:55:13 +01002886
2887 lock_sock(sk);
2888
Guangguan Wang3aba1032022-05-13 10:24:53 +08002889 if (sock->state == SS_CONNECTING) {
2890 if (sk->sk_state == SMC_ACTIVE)
2891 sock->state = SS_CONNECTED;
2892 else if (sk->sk_state == SMC_PEERCLOSEWAIT1 ||
2893 sk->sk_state == SMC_PEERCLOSEWAIT2 ||
2894 sk->sk_state == SMC_APPCLOSEWAIT1 ||
2895 sk->sk_state == SMC_APPCLOSEWAIT2 ||
2896 sk->sk_state == SMC_APPFINCLOSEWAIT)
2897 sock->state = SS_DISCONNECTING;
2898 }
2899
Ursula Braunac713872017-01-09 16:55:13 +01002900 rc = -ENOTCONN;
Ursula Brauncaa21e12018-08-08 14:13:19 +02002901 if ((sk->sk_state != SMC_ACTIVE) &&
Ursula Braunb38d7322017-01-09 16:55:25 +01002902 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2903 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2904 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2905 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2906 (sk->sk_state != SMC_APPFINCLOSEWAIT))
Ursula Braunac713872017-01-09 16:55:13 +01002907 goto out;
2908 if (smc->use_fallback) {
2909 rc = kernel_sock_shutdown(smc->clcsock, how);
2910 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
Tony Lu1a74e992022-04-14 15:51:03 +08002911 if (sk->sk_shutdown == SHUTDOWN_MASK) {
Ursula Braunac713872017-01-09 16:55:13 +01002912 sk->sk_state = SMC_CLOSED;
Guangguan Wang3aba1032022-05-13 10:24:53 +08002913 sk->sk_socket->state = SS_UNCONNECTED;
Tony Lu1a74e992022-04-14 15:51:03 +08002914 sock_put(sk);
2915 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002916 goto out;
Ursula Braunac713872017-01-09 16:55:13 +01002917 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002918 switch (how) {
2919 case SHUT_RDWR: /* shutdown in both directions */
Tony Lubacb6c12021-11-26 10:41:35 +08002920 old_state = sk->sk_state;
Ursula Braunb38d7322017-01-09 16:55:25 +01002921 rc = smc_close_active(smc);
Tony Lubacb6c12021-11-26 10:41:35 +08002922 if (old_state == SMC_ACTIVE &&
2923 sk->sk_state == SMC_PEERCLOSEWAIT1)
2924 do_shutdown = false;
Ursula Braunb38d7322017-01-09 16:55:25 +01002925 break;
2926 case SHUT_WR:
2927 rc = smc_close_shutdown_write(smc);
2928 break;
2929 case SHUT_RD:
Ursula Braun1255fcb2018-04-19 15:56:40 +02002930 rc = 0;
2931 /* nothing more to do because peer is not involved */
Ursula Braunb38d7322017-01-09 16:55:25 +01002932 break;
2933 }
Tony Lubacb6c12021-11-26 10:41:35 +08002934 if (do_shutdown && smc->clcsock)
Ursula Braun1255fcb2018-04-19 15:56:40 +02002935 rc1 = kernel_sock_shutdown(smc->clcsock, how);
Ursula Braunb38d7322017-01-09 16:55:25 +01002936 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2937 sk->sk_shutdown |= how + 1;
Ursula Braunac713872017-01-09 16:55:13 +01002938
Guangguan Wang3aba1032022-05-13 10:24:53 +08002939 if (sk->sk_state == SMC_CLOSED)
2940 sock->state = SS_UNCONNECTED;
2941 else
2942 sock->state = SS_DISCONNECTING;
Ursula Braunac713872017-01-09 16:55:13 +01002943out:
2944 release_sock(sk);
Ursula Braunb38d7322017-01-09 16:55:25 +01002945 return rc ? rc : rc1;
Ursula Braunac713872017-01-09 16:55:13 +01002946}
2947
D. Wythea6a6fe22022-02-10 17:11:37 +08002948static int __smc_getsockopt(struct socket *sock, int level, int optname,
2949 char __user *optval, int __user *optlen)
2950{
2951 struct smc_sock *smc;
2952 int val, len;
2953
2954 smc = smc_sk(sock->sk);
2955
2956 if (get_user(len, optlen))
2957 return -EFAULT;
2958
2959 len = min_t(int, len, sizeof(int));
2960
2961 if (len < 0)
2962 return -EINVAL;
2963
2964 switch (optname) {
2965 case SMC_LIMIT_HS:
2966 val = smc->limit_smc_hs;
2967 break;
2968 default:
2969 return -EOPNOTSUPP;
2970 }
2971
2972 if (put_user(len, optlen))
2973 return -EFAULT;
2974 if (copy_to_user(optval, &val, len))
2975 return -EFAULT;
2976
2977 return 0;
2978}
2979
2980static int __smc_setsockopt(struct socket *sock, int level, int optname,
2981 sockptr_t optval, unsigned int optlen)
2982{
2983 struct sock *sk = sock->sk;
2984 struct smc_sock *smc;
2985 int val, rc;
2986
2987 smc = smc_sk(sk);
2988
2989 lock_sock(sk);
2990 switch (optname) {
2991 case SMC_LIMIT_HS:
Dan Carpenter7a114552022-02-18 18:32:59 +03002992 if (optlen < sizeof(int)) {
2993 rc = -EINVAL;
2994 break;
2995 }
2996 if (copy_from_sockptr(&val, optval, sizeof(int))) {
2997 rc = -EFAULT;
2998 break;
2999 }
D. Wythea6a6fe22022-02-10 17:11:37 +08003000
3001 smc->limit_smc_hs = !!val;
3002 rc = 0;
3003 break;
3004 default:
3005 rc = -EOPNOTSUPP;
3006 break;
3007 }
3008 release_sock(sk);
3009
3010 return rc;
3011}
3012
Ursula Braunac713872017-01-09 16:55:13 +01003013static int smc_setsockopt(struct socket *sock, int level, int optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02003014 sockptr_t optval, unsigned int optlen)
Ursula Braunac713872017-01-09 16:55:13 +01003015{
3016 struct sock *sk = sock->sk;
3017 struct smc_sock *smc;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003018 int val, rc;
Ursula Braunac713872017-01-09 16:55:13 +01003019
Cong Wang86214362021-05-05 12:40:48 -07003020 if (level == SOL_TCP && optname == TCP_ULP)
3021 return -EOPNOTSUPP;
D. Wythea6a6fe22022-02-10 17:11:37 +08003022 else if (level == SOL_SMC)
3023 return __smc_setsockopt(sock, level, optname, optval, optlen);
Cong Wang86214362021-05-05 12:40:48 -07003024
Ursula Braunac713872017-01-09 16:55:13 +01003025 smc = smc_sk(sk);
3026
3027 /* generic setsockopts reaching us here always apply to the
3028 * CLC socket
3029 */
Wen Guc0bf3d82022-01-22 17:43:09 +08003030 mutex_lock(&smc->clcsock_release_lock);
3031 if (!smc->clcsock) {
3032 mutex_unlock(&smc->clcsock_release_lock);
3033 return -EBADF;
3034 }
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02003035 if (unlikely(!smc->clcsock->ops->setsockopt))
3036 rc = -EOPNOTSUPP;
3037 else
3038 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
3039 optval, optlen);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003040 if (smc->clcsock->sk->sk_err) {
3041 sk->sk_err = smc->clcsock->sk->sk_err;
Alexander Aringe3ae2362021-06-27 18:48:21 -04003042 sk_error_report(sk);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003043 }
Wen Guc0bf3d82022-01-22 17:43:09 +08003044 mutex_unlock(&smc->clcsock_release_lock);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003045
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003046 if (optlen < sizeof(int))
Wei Yongjun3dc9f552018-05-31 02:31:22 +00003047 return -EINVAL;
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02003048 if (copy_from_sockptr(&val, optval, sizeof(int)))
Ursula Braunac0107e2018-07-18 15:22:50 +02003049 return -EFAULT;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003050
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003051 lock_sock(sk);
Ursula Braun86434742019-12-12 22:35:58 +01003052 if (rc || smc->use_fallback)
3053 goto out;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003054 switch (optname) {
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003055 case TCP_FASTOPEN:
3056 case TCP_FASTOPEN_CONNECT:
3057 case TCP_FASTOPEN_KEY:
3058 case TCP_FASTOPEN_NO_COOKIE:
3059 /* option not supported by SMC */
Ursula Braun8204df72019-11-15 12:39:30 +01003060 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
Wen Guc0bf3d82022-01-22 17:43:09 +08003061 rc = smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003062 } else {
Ursula Braun86434742019-12-12 22:35:58 +01003063 rc = -EINVAL;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003064 }
3065 break;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003066 case TCP_NODELAY:
Ursula Braunf9cedf12019-08-02 10:16:38 +02003067 if (sk->sk_state != SMC_INIT &&
3068 sk->sk_state != SMC_LISTEN &&
3069 sk->sk_state != SMC_CLOSED) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02003070 if (val) {
Guvenc Gulce194730a2021-06-16 16:52:58 +02003071 SMC_STAT_INC(smc, ndly_cnt);
Dust Lib70a5cc2022-03-01 17:43:59 +08003072 smc_tx_pending(&smc->conn);
3073 cancel_delayed_work(&smc->conn.tx_work);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02003074 }
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003075 }
3076 break;
3077 case TCP_CORK:
Ursula Braunf9cedf12019-08-02 10:16:38 +02003078 if (sk->sk_state != SMC_INIT &&
3079 sk->sk_state != SMC_LISTEN &&
3080 sk->sk_state != SMC_CLOSED) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02003081 if (!val) {
Guvenc Gulce194730a2021-06-16 16:52:58 +02003082 SMC_STAT_INC(smc, cork_cnt);
Tony Luea785a12022-01-31 02:02:55 +08003083 smc_tx_pending(&smc->conn);
3084 cancel_delayed_work(&smc->conn.tx_work);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02003085 }
Ursula Braun01d2f7e2018-04-26 17:18:22 +02003086 }
3087 break;
Ursula Braunabb190f2018-04-26 17:18:23 +02003088 case TCP_DEFER_ACCEPT:
3089 smc->sockopt_defer_accept = val;
3090 break;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003091 default:
3092 break;
3093 }
Ursula Braun86434742019-12-12 22:35:58 +01003094out:
Ursula Braunee9dfbe2018-04-26 17:18:21 +02003095 release_sock(sk);
3096
3097 return rc;
Ursula Braunac713872017-01-09 16:55:13 +01003098}
3099
3100static int smc_getsockopt(struct socket *sock, int level, int optname,
3101 char __user *optval, int __user *optlen)
3102{
3103 struct smc_sock *smc;
Wen Guc0bf3d82022-01-22 17:43:09 +08003104 int rc;
Ursula Braunac713872017-01-09 16:55:13 +01003105
D. Wythea6a6fe22022-02-10 17:11:37 +08003106 if (level == SOL_SMC)
3107 return __smc_getsockopt(sock, level, optname, optval, optlen);
3108
Ursula Braunac713872017-01-09 16:55:13 +01003109 smc = smc_sk(sock->sk);
Wen Guc0bf3d82022-01-22 17:43:09 +08003110 mutex_lock(&smc->clcsock_release_lock);
3111 if (!smc->clcsock) {
3112 mutex_unlock(&smc->clcsock_release_lock);
3113 return -EBADF;
3114 }
Ursula Braunac713872017-01-09 16:55:13 +01003115 /* socket options apply to the CLC socket */
Wen Guc0bf3d82022-01-22 17:43:09 +08003116 if (unlikely(!smc->clcsock->ops->getsockopt)) {
3117 mutex_unlock(&smc->clcsock_release_lock);
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02003118 return -EOPNOTSUPP;
Wen Guc0bf3d82022-01-22 17:43:09 +08003119 }
3120 rc = smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
3121 optval, optlen);
3122 mutex_unlock(&smc->clcsock_release_lock);
3123 return rc;
Ursula Braunac713872017-01-09 16:55:13 +01003124}
3125
3126static int smc_ioctl(struct socket *sock, unsigned int cmd,
3127 unsigned long arg)
3128{
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003129 union smc_host_cursor cons, urg;
3130 struct smc_connection *conn;
Ursula Braunac713872017-01-09 16:55:13 +01003131 struct smc_sock *smc;
Ursula Braun9b67e262018-05-02 16:56:46 +02003132 int answ;
Ursula Braunac713872017-01-09 16:55:13 +01003133
3134 smc = smc_sk(sock->sk);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003135 conn = &smc->conn;
Ursula Braun1992d992018-07-16 13:56:52 +02003136 lock_sock(&smc->sk);
Ursula Braun7311d662018-08-08 14:13:21 +02003137 if (smc->use_fallback) {
3138 if (!smc->clcsock) {
3139 release_sock(&smc->sk);
3140 return -EBADF;
3141 }
3142 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
3143 release_sock(&smc->sk);
3144 return answ;
3145 }
Ursula Braun9b67e262018-05-02 16:56:46 +02003146 switch (cmd) {
3147 case SIOCINQ: /* same as FIONREAD */
Ursula Braun1992d992018-07-16 13:56:52 +02003148 if (smc->sk.sk_state == SMC_LISTEN) {
3149 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02003150 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02003151 }
Ursula Braun2351abe2018-05-23 16:38:09 +02003152 if (smc->sk.sk_state == SMC_INIT ||
3153 smc->sk.sk_state == SMC_CLOSED)
3154 answ = 0;
3155 else
3156 answ = atomic_read(&smc->conn.bytes_to_rcv);
Ursula Braun9b67e262018-05-02 16:56:46 +02003157 break;
3158 case SIOCOUTQ:
3159 /* output queue size (not send + not acked) */
Ursula Braun1992d992018-07-16 13:56:52 +02003160 if (smc->sk.sk_state == SMC_LISTEN) {
3161 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02003162 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02003163 }
Ursula Braun2351abe2018-05-23 16:38:09 +02003164 if (smc->sk.sk_state == SMC_INIT ||
3165 smc->sk.sk_state == SMC_CLOSED)
3166 answ = 0;
3167 else
3168 answ = smc->conn.sndbuf_desc->len -
Ursula Braun9b67e262018-05-02 16:56:46 +02003169 atomic_read(&smc->conn.sndbuf_space);
3170 break;
3171 case SIOCOUTQNSD:
3172 /* output queue size (not send only) */
Ursula Braun1992d992018-07-16 13:56:52 +02003173 if (smc->sk.sk_state == SMC_LISTEN) {
3174 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02003175 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02003176 }
Ursula Braun2351abe2018-05-23 16:38:09 +02003177 if (smc->sk.sk_state == SMC_INIT ||
3178 smc->sk.sk_state == SMC_CLOSED)
3179 answ = 0;
3180 else
3181 answ = smc_tx_prepared_sends(&smc->conn);
Ursula Braun9b67e262018-05-02 16:56:46 +02003182 break;
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003183 case SIOCATMARK:
Ursula Braun1992d992018-07-16 13:56:52 +02003184 if (smc->sk.sk_state == SMC_LISTEN) {
3185 release_sock(&smc->sk);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003186 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02003187 }
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003188 if (smc->sk.sk_state == SMC_INIT ||
3189 smc->sk.sk_state == SMC_CLOSED) {
3190 answ = 0;
3191 } else {
Stefan Rasplbac6de72018-07-23 13:53:09 +02003192 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
3193 smc_curs_copy(&urg, &conn->urg_curs, conn);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02003194 answ = smc_curs_diff(conn->rmb_desc->len,
3195 &cons, &urg) == 1;
3196 }
3197 break;
Ursula Braun9b67e262018-05-02 16:56:46 +02003198 default:
Ursula Braun1992d992018-07-16 13:56:52 +02003199 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02003200 return -ENOIOCTLCMD;
3201 }
Ursula Braun1992d992018-07-16 13:56:52 +02003202 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02003203
3204 return put_user(answ, (int __user *)arg);
Ursula Braunac713872017-01-09 16:55:13 +01003205}
3206
Stefan Raspl9014db22018-05-03 18:12:39 +02003207/* Map the affected portions of the rmbe into an spd, note the number of bytes
3208 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
3209 * updates till whenever a respective page has been fully processed.
3210 * Note that subsequent recv() calls have to wait till all splice() processing
3211 * completed.
3212 */
Ursula Braunac713872017-01-09 16:55:13 +01003213static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
3214 struct pipe_inode_info *pipe, size_t len,
Stefan Raspl9014db22018-05-03 18:12:39 +02003215 unsigned int flags)
Ursula Braunac713872017-01-09 16:55:13 +01003216{
3217 struct sock *sk = sock->sk;
3218 struct smc_sock *smc;
3219 int rc = -ENOTCONN;
3220
3221 smc = smc_sk(sk);
3222 lock_sock(sk);
Karsten Graul51c5aba2019-01-30 18:51:04 +01003223 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
3224 /* socket was connected before, no more data to read */
3225 rc = 0;
3226 goto out;
3227 }
Stefan Raspl9014db22018-05-03 18:12:39 +02003228 if (sk->sk_state == SMC_INIT ||
3229 sk->sk_state == SMC_LISTEN ||
3230 sk->sk_state == SMC_CLOSED)
Ursula Braunac713872017-01-09 16:55:13 +01003231 goto out;
Stefan Raspl9014db22018-05-03 18:12:39 +02003232
3233 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
3234 rc = 0;
3235 goto out;
3236 }
3237
Ursula Braunac713872017-01-09 16:55:13 +01003238 if (smc->use_fallback) {
3239 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
3240 pipe, len, flags);
3241 } else {
Stefan Raspl9014db22018-05-03 18:12:39 +02003242 if (*ppos) {
3243 rc = -ESPIPE;
3244 goto out;
3245 }
3246 if (flags & SPLICE_F_NONBLOCK)
3247 flags = MSG_DONTWAIT;
3248 else
3249 flags = 0;
Guvenc Gulce194730a2021-06-16 16:52:58 +02003250 SMC_STAT_INC(smc, splice_cnt);
Stefan Raspl9014db22018-05-03 18:12:39 +02003251 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
Ursula Braunac713872017-01-09 16:55:13 +01003252 }
3253out:
3254 release_sock(sk);
Stefan Raspl9014db22018-05-03 18:12:39 +02003255
Ursula Braunac713872017-01-09 16:55:13 +01003256 return rc;
3257}
3258
3259/* must look like tcp */
3260static const struct proto_ops smc_sock_ops = {
3261 .family = PF_SMC,
3262 .owner = THIS_MODULE,
3263 .release = smc_release,
3264 .bind = smc_bind,
3265 .connect = smc_connect,
3266 .socketpair = sock_no_socketpair,
3267 .accept = smc_accept,
3268 .getname = smc_getname,
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07003269 .poll = smc_poll,
Ursula Braunac713872017-01-09 16:55:13 +01003270 .ioctl = smc_ioctl,
3271 .listen = smc_listen,
3272 .shutdown = smc_shutdown,
3273 .setsockopt = smc_setsockopt,
3274 .getsockopt = smc_getsockopt,
3275 .sendmsg = smc_sendmsg,
3276 .recvmsg = smc_recvmsg,
3277 .mmap = sock_no_mmap,
Ursula Braunac713872017-01-09 16:55:13 +01003278 .splice_read = smc_splice_read,
3279};
3280
Tony Lud7cd4212021-12-28 21:44:36 +08003281static int __smc_create(struct net *net, struct socket *sock, int protocol,
3282 int kern, struct socket *clcsock)
Ursula Braunac713872017-01-09 16:55:13 +01003283{
Karsten Graulaaa4d332018-03-16 15:06:41 +01003284 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
Ursula Braunac713872017-01-09 16:55:13 +01003285 struct smc_sock *smc;
3286 struct sock *sk;
3287 int rc;
3288
3289 rc = -ESOCKTNOSUPPORT;
3290 if (sock->type != SOCK_STREAM)
3291 goto out;
3292
3293 rc = -EPROTONOSUPPORT;
Karsten Graulaaa4d332018-03-16 15:06:41 +01003294 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
Ursula Braunac713872017-01-09 16:55:13 +01003295 goto out;
3296
3297 rc = -ENOBUFS;
3298 sock->ops = &smc_sock_ops;
Guangguan Wang3aba1032022-05-13 10:24:53 +08003299 sock->state = SS_UNCONNECTED;
Karsten Graulaaa4d332018-03-16 15:06:41 +01003300 sk = smc_sock_alloc(net, sock, protocol);
Ursula Braunac713872017-01-09 16:55:13 +01003301 if (!sk)
3302 goto out;
3303
3304 /* create internal TCP socket for CLC handshake and fallback */
3305 smc = smc_sk(sk);
Ursula Brauna046d572017-01-09 16:55:16 +01003306 smc->use_fallback = false; /* assume rdma capability first */
Karsten Graul603cc142018-07-25 16:35:32 +02003307 smc->fallback_rsn = 0;
Tony Lud7cd4212021-12-28 21:44:36 +08003308
D. Wythef9496b72022-02-10 17:11:38 +08003309 /* default behavior from limit_smc_hs in every net namespace */
3310 smc->limit_smc_hs = net->smc.limit_smc_hs;
3311
Tony Lud7cd4212021-12-28 21:44:36 +08003312 rc = 0;
3313 if (!clcsock) {
3314 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
3315 &smc->clcsock);
3316 if (rc) {
3317 sk_common_release(sk);
3318 goto out;
3319 }
Kuniyuki Iwashima9744d2b2023-04-08 11:49:43 -07003320
3321 /* smc_clcsock_release() does not wait smc->clcsock->sk's
3322 * destruction; its sk_state might not be TCP_CLOSE after
3323 * smc->sk is close()d, and TCP timers can be fired later,
3324 * which need net ref.
3325 */
3326 sk = smc->clcsock->sk;
3327 __netns_tracker_free(net, &sk->ns_tracker, false);
3328 sk->sk_net_refcnt = 1;
3329 get_net_track(net, &sk->ns_tracker, GFP_KERNEL);
3330 sock_inuse_add(net, 1);
Tony Lud7cd4212021-12-28 21:44:36 +08003331 } else {
3332 smc->clcsock = clcsock;
Davide Carattia5dcb732018-02-28 12:44:09 +01003333 }
Tony Lud7cd4212021-12-28 21:44:36 +08003334
Ursula Braunac713872017-01-09 16:55:13 +01003335out:
3336 return rc;
3337}
3338
Tony Lud7cd4212021-12-28 21:44:36 +08003339static int smc_create(struct net *net, struct socket *sock, int protocol,
3340 int kern)
3341{
3342 return __smc_create(net, sock, protocol, kern, NULL);
3343}
3344
Ursula Braunac713872017-01-09 16:55:13 +01003345static const struct net_proto_family smc_sock_family_ops = {
3346 .family = PF_SMC,
3347 .owner = THIS_MODULE,
3348 .create = smc_create,
3349};
3350
Tony Lud7cd4212021-12-28 21:44:36 +08003351static int smc_ulp_init(struct sock *sk)
3352{
3353 struct socket *tcp = sk->sk_socket;
3354 struct net *net = sock_net(sk);
3355 struct socket *smcsock;
3356 int protocol, ret;
3357
3358 /* only TCP can be replaced */
3359 if (tcp->type != SOCK_STREAM || sk->sk_protocol != IPPROTO_TCP ||
3360 (sk->sk_family != AF_INET && sk->sk_family != AF_INET6))
3361 return -ESOCKTNOSUPPORT;
3362 /* don't handle wq now */
3363 if (tcp->state != SS_UNCONNECTED || !tcp->file || tcp->wq.fasync_list)
3364 return -ENOTCONN;
3365
3366 if (sk->sk_family == AF_INET)
3367 protocol = SMCPROTO_SMC;
3368 else
3369 protocol = SMCPROTO_SMC6;
3370
3371 smcsock = sock_alloc();
3372 if (!smcsock)
3373 return -ENFILE;
3374
3375 smcsock->type = SOCK_STREAM;
3376 __module_get(THIS_MODULE); /* tried in __tcp_ulp_find_autoload */
3377 ret = __smc_create(net, smcsock, protocol, 1, tcp);
3378 if (ret) {
3379 sock_release(smcsock); /* module_put() which ops won't be NULL */
3380 return ret;
3381 }
3382
3383 /* replace tcp socket to smc */
3384 smcsock->file = tcp->file;
3385 smcsock->file->private_data = smcsock;
3386 smcsock->file->f_inode = SOCK_INODE(smcsock); /* replace inode when sock_close */
3387 smcsock->file->f_path.dentry->d_inode = SOCK_INODE(smcsock); /* dput() in __fput */
3388 tcp->file = NULL;
3389
3390 return ret;
3391}
3392
3393static void smc_ulp_clone(const struct request_sock *req, struct sock *newsk,
3394 const gfp_t priority)
3395{
3396 struct inet_connection_sock *icsk = inet_csk(newsk);
3397
3398 /* don't inherit ulp ops to child when listen */
3399 icsk->icsk_ulp_ops = NULL;
3400}
3401
3402static struct tcp_ulp_ops smc_ulp_ops __read_mostly = {
3403 .name = "smc",
3404 .owner = THIS_MODULE,
3405 .init = smc_ulp_init,
3406 .clone = smc_ulp_clone,
3407};
3408
Hans Wippel64e28b52019-02-21 13:01:02 +01003409unsigned int smc_net_id;
3410
3411static __net_init int smc_net_init(struct net *net)
3412{
Dust Li7de8eb02022-03-07 09:54:24 +08003413 int rc;
3414
3415 rc = smc_sysctl_net_init(net);
3416 if (rc)
3417 return rc;
Hans Wippel64e28b52019-02-21 13:01:02 +01003418 return smc_pnet_net_init(net);
3419}
3420
3421static void __net_exit smc_net_exit(struct net *net)
3422{
Dust Li7de8eb02022-03-07 09:54:24 +08003423 smc_sysctl_net_exit(net);
Hans Wippel64e28b52019-02-21 13:01:02 +01003424 smc_pnet_net_exit(net);
3425}
3426
Guvenc Gulce194730a2021-06-16 16:52:58 +02003427static __net_init int smc_net_stat_init(struct net *net)
3428{
3429 return smc_stats_init(net);
3430}
3431
3432static void __net_exit smc_net_stat_exit(struct net *net)
3433{
3434 smc_stats_exit(net);
3435}
3436
Hans Wippel64e28b52019-02-21 13:01:02 +01003437static struct pernet_operations smc_net_ops = {
3438 .init = smc_net_init,
3439 .exit = smc_net_exit,
3440 .id = &smc_net_id,
3441 .size = sizeof(struct smc_net),
3442};
3443
Guvenc Gulce194730a2021-06-16 16:52:58 +02003444static struct pernet_operations smc_net_stat_ops = {
3445 .init = smc_net_stat_init,
3446 .exit = smc_net_stat_exit,
3447};
3448
Ursula Braunac713872017-01-09 16:55:13 +01003449static int __init smc_init(void)
3450{
3451 int rc;
3452
Hans Wippel64e28b52019-02-21 13:01:02 +01003453 rc = register_pernet_subsys(&smc_net_ops);
3454 if (rc)
3455 return rc;
3456
Guvenc Gulce194730a2021-06-16 16:52:58 +02003457 rc = register_pernet_subsys(&smc_net_stat_ops);
3458 if (rc)
Chen Zhongjin62ff3732022-11-01 17:37:22 +08003459 goto out_pernet_subsys;
Guvenc Gulce194730a2021-06-16 16:52:58 +02003460
Stefan Raspl87477162023-01-23 19:17:49 +01003461 rc = smc_ism_init();
3462 if (rc)
3463 goto out_pernet_subsys_stat;
Ursula Braunb81a5eb2020-09-26 12:44:31 +02003464 smc_clc_init();
Ursula Braun201091e2020-09-26 12:44:24 +02003465
Guvenc Gulcee8372d92020-12-01 20:20:43 +01003466 rc = smc_nl_init();
Thomas Richter6812baa2017-01-09 16:55:15 +01003467 if (rc)
Stefan Raspl87477162023-01-23 19:17:49 +01003468 goto out_ism;
Thomas Richter6812baa2017-01-09 16:55:15 +01003469
Guvenc Gulcee8372d92020-12-01 20:20:43 +01003470 rc = smc_pnet_init();
3471 if (rc)
3472 goto out_nl;
3473
Karsten Graul22ef4732020-09-10 18:48:29 +02003474 rc = -ENOMEM;
D. Wythe3079e342022-02-10 17:11:34 +08003475
3476 smc_tcp_ls_wq = alloc_workqueue("smc_tcp_ls_wq", 0, 0);
3477 if (!smc_tcp_ls_wq)
3478 goto out_pnet;
3479
Karsten Graul22ef4732020-09-10 18:48:29 +02003480 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
3481 if (!smc_hs_wq)
D. Wythe3079e342022-02-10 17:11:34 +08003482 goto out_alloc_tcp_ls_wq;
Karsten Graul22ef4732020-09-10 18:48:29 +02003483
3484 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
3485 if (!smc_close_wq)
3486 goto out_alloc_hs_wq;
3487
Ursula Braun6dabd402019-11-16 17:47:29 +01003488 rc = smc_core_init();
3489 if (rc) {
3490 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
Guvenc Gulce194730a2021-06-16 16:52:58 +02003491 goto out_alloc_wqs;
Ursula Braun6dabd402019-11-16 17:47:29 +01003492 }
3493
Ursula Braun9bf9abe2017-01-09 16:55:21 +01003494 rc = smc_llc_init();
3495 if (rc) {
3496 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01003497 goto out_core;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01003498 }
3499
Ursula Braun5f083182017-01-09 16:55:22 +01003500 rc = smc_cdc_init();
3501 if (rc) {
3502 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01003503 goto out_core;
Ursula Braun5f083182017-01-09 16:55:22 +01003504 }
3505
Ursula Braunac713872017-01-09 16:55:13 +01003506 rc = proto_register(&smc_proto, 1);
3507 if (rc) {
Karsten Graulaaa4d332018-03-16 15:06:41 +01003508 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01003509 goto out_core;
Ursula Braunac713872017-01-09 16:55:13 +01003510 }
3511
Karsten Graulaaa4d332018-03-16 15:06:41 +01003512 rc = proto_register(&smc_proto6, 1);
3513 if (rc) {
3514 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
3515 goto out_proto;
3516 }
3517
Ursula Braunac713872017-01-09 16:55:13 +01003518 rc = sock_register(&smc_sock_family_ops);
3519 if (rc) {
3520 pr_err("%s: sock_register fails with %d\n", __func__, rc);
Karsten Graulaaa4d332018-03-16 15:06:41 +01003521 goto out_proto6;
Ursula Braunac713872017-01-09 16:55:13 +01003522 }
Ursula Braunf16a7dd2017-01-09 16:55:26 +01003523 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
Karsten Graulaaa4d332018-03-16 15:06:41 +01003524 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
Ursula Braunac713872017-01-09 16:55:13 +01003525
Ursula Brauna4cf0442017-01-09 16:55:14 +01003526 rc = smc_ib_register_client();
3527 if (rc) {
3528 pr_err("%s: ib_register fails with %d\n", __func__, rc);
3529 goto out_sock;
3530 }
3531
Tony Lud7cd4212021-12-28 21:44:36 +08003532 rc = tcp_register_ulp(&smc_ulp_ops);
3533 if (rc) {
3534 pr_err("%s: tcp_ulp_register fails with %d\n", __func__, rc);
Tony Lu4d08b7b2022-02-25 14:56:57 +08003535 goto out_ib;
Tony Lud7cd4212021-12-28 21:44:36 +08003536 }
3537
Ursula Braunc5c1cc92017-10-25 11:01:46 +02003538 static_branch_enable(&tcp_have_smc);
Ursula Braunac713872017-01-09 16:55:13 +01003539 return 0;
3540
Tony Lu4d08b7b2022-02-25 14:56:57 +08003541out_ib:
3542 smc_ib_unregister_client();
Ursula Brauna4cf0442017-01-09 16:55:14 +01003543out_sock:
3544 sock_unregister(PF_SMC);
Karsten Graulaaa4d332018-03-16 15:06:41 +01003545out_proto6:
3546 proto_unregister(&smc_proto6);
Ursula Braunac713872017-01-09 16:55:13 +01003547out_proto:
3548 proto_unregister(&smc_proto);
Ursula Braun6dabd402019-11-16 17:47:29 +01003549out_core:
3550 smc_core_exit();
Karsten Graul22ef4732020-09-10 18:48:29 +02003551out_alloc_wqs:
3552 destroy_workqueue(smc_close_wq);
3553out_alloc_hs_wq:
3554 destroy_workqueue(smc_hs_wq);
D. Wythe3079e342022-02-10 17:11:34 +08003555out_alloc_tcp_ls_wq:
3556 destroy_workqueue(smc_tcp_ls_wq);
Thomas Richter6812baa2017-01-09 16:55:15 +01003557out_pnet:
3558 smc_pnet_exit();
Guvenc Gulcee8372d92020-12-01 20:20:43 +01003559out_nl:
3560 smc_nl_exit();
Stefan Raspl87477162023-01-23 19:17:49 +01003561out_ism:
Stefan Raspl9d876d32023-03-13 11:08:29 +01003562 smc_clc_exit();
Stefan Raspl87477162023-01-23 19:17:49 +01003563 smc_ism_exit();
Chen Zhongjin62ff3732022-11-01 17:37:22 +08003564out_pernet_subsys_stat:
3565 unregister_pernet_subsys(&smc_net_stat_ops);
YueHaibing8c33bf12019-06-26 17:47:50 +02003566out_pernet_subsys:
3567 unregister_pernet_subsys(&smc_net_ops);
3568
Ursula Braunac713872017-01-09 16:55:13 +01003569 return rc;
3570}
3571
3572static void __exit smc_exit(void)
3573{
Ursula Braunc5c1cc92017-10-25 11:01:46 +02003574 static_branch_disable(&tcp_have_smc);
Tony Lud7cd4212021-12-28 21:44:36 +08003575 tcp_unregister_ulp(&smc_ulp_ops);
Ursula Braunac713872017-01-09 16:55:13 +01003576 sock_unregister(PF_SMC);
Ursula Braun6dabd402019-11-16 17:47:29 +01003577 smc_core_exit();
3578 smc_ib_unregister_client();
Stefan Raspl8c81ba22023-01-23 19:17:52 +01003579 smc_ism_exit();
Karsten Graul22ef4732020-09-10 18:48:29 +02003580 destroy_workqueue(smc_close_wq);
D. Wythe3079e342022-02-10 17:11:34 +08003581 destroy_workqueue(smc_tcp_ls_wq);
Karsten Graul22ef4732020-09-10 18:48:29 +02003582 destroy_workqueue(smc_hs_wq);
Karsten Graulaaa4d332018-03-16 15:06:41 +01003583 proto_unregister(&smc_proto6);
Ursula Braunac713872017-01-09 16:55:13 +01003584 proto_unregister(&smc_proto);
Thomas Richter6812baa2017-01-09 16:55:15 +01003585 smc_pnet_exit();
Guvenc Gulcee8372d92020-12-01 20:20:43 +01003586 smc_nl_exit();
Karsten Graulfa086662021-09-14 10:35:05 +02003587 smc_clc_exit();
Guvenc Gulce194730a2021-06-16 16:52:58 +02003588 unregister_pernet_subsys(&smc_net_stat_ops);
Hans Wippel64e28b52019-02-21 13:01:02 +01003589 unregister_pernet_subsys(&smc_net_ops);
Ursula Braun4ead9c92019-11-16 17:47:31 +01003590 rcu_barrier();
Ursula Braunac713872017-01-09 16:55:13 +01003591}
3592
3593module_init(smc_init);
3594module_exit(smc_exit);
3595
3596MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
3597MODULE_DESCRIPTION("smc socket address family");
3598MODULE_LICENSE("GPL");
3599MODULE_ALIAS_NETPROTO(PF_SMC);
Tony Lud7cd4212021-12-28 21:44:36 +08003600MODULE_ALIAS_TCP_ULP("smc");
Stefan Raspl28ec53f2022-07-25 16:10:00 +02003601MODULE_ALIAS_GENL_FAMILY(SMC_GENL_FAMILY_NAME);