blob: 1c9289f56dc471d33b08f6138bee3bea8aabe26f [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>
Ingo Molnarc3edc402017-02-02 08:35:14 +010030
Ursula Braunac713872017-01-09 16:55:13 +010031#include <net/sock.h>
Ursula Brauna046d572017-01-09 16:55:16 +010032#include <net/tcp.h>
Ursula Braunf16a7dd2017-01-09 16:55:26 +010033#include <net/smc.h>
Ursula Braun9b67e262018-05-02 16:56:46 +020034#include <asm/ioctls.h>
Ursula Braunac713872017-01-09 16:55:13 +010035
Hans Wippel64e28b52019-02-21 13:01:02 +010036#include <net/net_namespace.h>
37#include <net/netns/generic.h>
38#include "smc_netns.h"
39
Ursula Braunac713872017-01-09 16:55:13 +010040#include "smc.h"
Ursula Brauna046d572017-01-09 16:55:16 +010041#include "smc_clc.h"
Ursula Braun9bf9abe2017-01-09 16:55:21 +010042#include "smc_llc.h"
Ursula Braun5f083182017-01-09 16:55:22 +010043#include "smc_cdc.h"
Ursula Braun0cfdd8f2017-01-09 16:55:17 +010044#include "smc_core.h"
Ursula Brauna4cf0442017-01-09 16:55:14 +010045#include "smc_ib.h"
Hans Wippel41349842018-06-28 19:05:11 +020046#include "smc_ism.h"
Thomas Richter6812baa2017-01-09 16:55:15 +010047#include "smc_pnet.h"
Guvenc Gulcee8372d92020-12-01 20:20:43 +010048#include "smc_netlink.h"
Ursula Braune6727f32017-01-09 16:55:23 +010049#include "smc_tx.h"
Ursula Braun952310c2017-01-09 16:55:24 +010050#include "smc_rx.h"
Ursula Braunb38d7322017-01-09 16:55:25 +010051#include "smc_close.h"
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +020052#include "smc_stats.h"
Tony Lu48262602021-11-01 15:39:12 +080053#include "smc_tracepoint.h"
Ursula Braunac713872017-01-09 16:55:13 +010054
Hans Wippel72a36a82019-02-07 15:56:18 +010055static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
56 * creation on server
57 */
58static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
59 * creation on client
Ursula Braun0cfdd8f2017-01-09 16:55:17 +010060 */
61
Karsten Graul22ef4732020-09-10 18:48:29 +020062struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
63struct workqueue_struct *smc_close_wq; /* wq for close work */
64
Ursula Brauna046d572017-01-09 16:55:16 +010065static void smc_tcp_listen_work(struct work_struct *);
Ursula Braun24ac3a02018-06-27 17:59:50 +020066static void smc_connect_work(struct work_struct *);
Ursula Brauna046d572017-01-09 16:55:16 +010067
Ursula Braunac713872017-01-09 16:55:13 +010068static void smc_set_keepalive(struct sock *sk, int val)
69{
70 struct smc_sock *smc = smc_sk(sk);
71
72 smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
73}
74
Ursula Braunf16a7dd2017-01-09 16:55:26 +010075static struct smc_hashinfo smc_v4_hashinfo = {
76 .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
77};
78
Karsten Graulaaa4d332018-03-16 15:06:41 +010079static struct smc_hashinfo smc_v6_hashinfo = {
80 .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
81};
82
Ursula Braunf16a7dd2017-01-09 16:55:26 +010083int smc_hash_sk(struct sock *sk)
84{
85 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
86 struct hlist_head *head;
87
88 head = &h->ht;
89
90 write_lock_bh(&h->lock);
91 sk_add_node(sk, head);
92 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
93 write_unlock_bh(&h->lock);
94
95 return 0;
96}
97EXPORT_SYMBOL_GPL(smc_hash_sk);
98
99void smc_unhash_sk(struct sock *sk)
100{
101 struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
102
103 write_lock_bh(&h->lock);
104 if (sk_del_node_init(sk))
105 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
106 write_unlock_bh(&h->lock);
107}
108EXPORT_SYMBOL_GPL(smc_unhash_sk);
109
110struct proto smc_proto = {
Ursula Braunac713872017-01-09 16:55:13 +0100111 .name = "SMC",
112 .owner = THIS_MODULE,
113 .keepalive = smc_set_keepalive,
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100114 .hash = smc_hash_sk,
115 .unhash = smc_unhash_sk,
Ursula Braunac713872017-01-09 16:55:13 +0100116 .obj_size = sizeof(struct smc_sock),
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100117 .h.smc_hash = &smc_v4_hashinfo,
Paul E. McKenney5f0d5a32017-01-18 02:53:44 -0800118 .slab_flags = SLAB_TYPESAFE_BY_RCU,
Ursula Braunac713872017-01-09 16:55:13 +0100119};
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100120EXPORT_SYMBOL_GPL(smc_proto);
Ursula Braunac713872017-01-09 16:55:13 +0100121
Karsten Graulaaa4d332018-03-16 15:06:41 +0100122struct proto smc_proto6 = {
123 .name = "SMC6",
124 .owner = THIS_MODULE,
125 .keepalive = smc_set_keepalive,
126 .hash = smc_hash_sk,
127 .unhash = smc_unhash_sk,
128 .obj_size = sizeof(struct smc_sock),
129 .h.smc_hash = &smc_v6_hashinfo,
130 .slab_flags = SLAB_TYPESAFE_BY_RCU,
131};
132EXPORT_SYMBOL_GPL(smc_proto6);
133
Ursula Braunf536dff2019-10-23 15:44:05 +0200134static void smc_restore_fallback_changes(struct smc_sock *smc)
135{
Karsten Graul1ad24052020-07-18 15:06:18 +0200136 if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
137 smc->clcsock->file->private_data = smc->sk.sk_socket;
138 smc->clcsock->file = NULL;
139 }
Ursula Braunf536dff2019-10-23 15:44:05 +0200140}
141
Ursula Braun39f41f32019-06-27 15:04:52 +0200142static int __smc_release(struct smc_sock *smc)
Ursula Braunac713872017-01-09 16:55:13 +0100143{
Ursula Braun39f41f32019-06-27 15:04:52 +0200144 struct sock *sk = &smc->sk;
Ursula Braunb38d7322017-01-09 16:55:25 +0100145 int rc = 0;
Ursula Braunac713872017-01-09 16:55:13 +0100146
Ursula Braun51f1de72018-01-26 09:28:48 +0100147 if (!smc->use_fallback) {
Ursula Braunb38d7322017-01-09 16:55:25 +0100148 rc = smc_close_active(smc);
149 sock_set_flag(sk, SOCK_DEAD);
150 sk->sk_shutdown |= SHUTDOWN_MASK;
Ursula Braunb03faa12019-02-07 15:56:15 +0100151 } else {
Dust Lie5d5aad2021-11-10 15:02:34 +0800152 if (sk->sk_state != SMC_CLOSED) {
153 if (sk->sk_state != SMC_LISTEN &&
154 sk->sk_state != SMC_INIT)
155 sock_put(sk); /* passive closing */
156 if (sk->sk_state == SMC_LISTEN) {
157 /* wake up clcsock accept */
158 rc = kernel_sock_shutdown(smc->clcsock,
159 SHUT_RDWR);
160 }
161 sk->sk_state = SMC_CLOSED;
162 sk->sk_state_change(sk);
Ursula Braunb03faa12019-02-07 15:56:15 +0100163 }
Ursula Braunf536dff2019-10-23 15:44:05 +0200164 smc_restore_fallback_changes(smc);
Ursula Braunb38d7322017-01-09 16:55:25 +0100165 }
Cong Wang26d92e92019-01-05 23:45:26 -0800166
167 sk->sk_prot->unhash(sk);
168
Ursula Braunb03faa12019-02-07 15:56:15 +0100169 if (sk->sk_state == SMC_CLOSED) {
170 if (smc->clcsock) {
Karsten Graulfd577702019-04-11 11:17:30 +0200171 release_sock(sk);
172 smc_clcsock_release(smc);
173 lock_sock(sk);
Myungho Jung78abe3d2018-12-18 09:02:25 -0800174 }
Ursula Braunb03faa12019-02-07 15:56:15 +0100175 if (!smc->use_fallback)
176 smc_conn_free(&smc->conn);
Ursula Braun51f1de72018-01-26 09:28:48 +0100177 }
Ursula Braunac713872017-01-09 16:55:13 +0100178
Ursula Braun39f41f32019-06-27 15:04:52 +0200179 return rc;
180}
181
182static int smc_release(struct socket *sock)
183{
184 struct sock *sk = sock->sk;
185 struct smc_sock *smc;
186 int rc = 0;
187
188 if (!sk)
189 goto out;
190
Ursula Braun81cf4f42019-10-21 16:13:15 +0200191 sock_hold(sk); /* sock_put below */
Ursula Braun39f41f32019-06-27 15:04:52 +0200192 smc = smc_sk(sk);
193
194 /* cleanup for a dangling non-blocking connect */
195 if (smc->connect_nonblock && sk->sk_state == SMC_INIT)
196 tcp_abort(smc->clcsock->sk, ECONNABORTED);
D. Wythe5c15b312021-12-15 20:29:21 +0800197
198 if (cancel_work_sync(&smc->connect_work))
199 sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
Ursula Braun39f41f32019-06-27 15:04:52 +0200200
201 if (sk->sk_state == SMC_LISTEN)
202 /* smc_close_non_accepted() is called and acquires
203 * sock lock for child sockets again
204 */
205 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
206 else
207 lock_sock(sk);
208
209 rc = __smc_release(smc);
210
Ursula Braunac713872017-01-09 16:55:13 +0100211 /* detach socket */
212 sock_orphan(sk);
213 sock->sk = NULL;
214 release_sock(sk);
215
Ursula Braun81cf4f42019-10-21 16:13:15 +0200216 sock_put(sk); /* sock_hold above */
Ursula Braun51f1de72018-01-26 09:28:48 +0100217 sock_put(sk); /* final sock_put */
Ursula Braunac713872017-01-09 16:55:13 +0100218out:
Ursula Braunb38d7322017-01-09 16:55:25 +0100219 return rc;
Ursula Braunac713872017-01-09 16:55:13 +0100220}
221
222static void smc_destruct(struct sock *sk)
223{
224 if (sk->sk_state != SMC_CLOSED)
225 return;
226 if (!sock_flag(sk, SOCK_DEAD))
227 return;
228
229 sk_refcnt_debug_dec(sk);
230}
231
Karsten Graulaaa4d332018-03-16 15:06:41 +0100232static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
233 int protocol)
Ursula Braunac713872017-01-09 16:55:13 +0100234{
235 struct smc_sock *smc;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100236 struct proto *prot;
Ursula Braunac713872017-01-09 16:55:13 +0100237 struct sock *sk;
238
Karsten Graulaaa4d332018-03-16 15:06:41 +0100239 prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
240 sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
Ursula Braunac713872017-01-09 16:55:13 +0100241 if (!sk)
242 return NULL;
243
244 sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
245 sk->sk_state = SMC_INIT;
246 sk->sk_destruct = smc_destruct;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100247 sk->sk_protocol = protocol;
Ursula Braunac713872017-01-09 16:55:13 +0100248 smc = smc_sk(sk);
Ursula Brauna046d572017-01-09 16:55:16 +0100249 INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
Ursula Braun24ac3a02018-06-27 17:59:50 +0200250 INIT_WORK(&smc->connect_work, smc_connect_work);
Eric Dumazetbe7f3e52018-05-17 03:54:21 -0700251 INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
Ursula Brauna046d572017-01-09 16:55:16 +0100252 INIT_LIST_HEAD(&smc->accept_q);
253 spin_lock_init(&smc->accept_q_lock);
Eric Dumazetbe7f3e52018-05-17 03:54:21 -0700254 spin_lock_init(&smc->conn.send_lock);
Ursula Braunf16a7dd2017-01-09 16:55:26 +0100255 sk->sk_prot->hash(sk);
Ursula Brauna046d572017-01-09 16:55:16 +0100256 sk_refcnt_debug_inc(sk);
Myungho Jung78abe3d2018-12-18 09:02:25 -0800257 mutex_init(&smc->clcsock_release_lock);
Ursula Braunac713872017-01-09 16:55:13 +0100258
259 return sk;
260}
261
262static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
263 int addr_len)
264{
265 struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
266 struct sock *sk = sock->sk;
267 struct smc_sock *smc;
268 int rc;
269
270 smc = smc_sk(sk);
271
272 /* replicate tests from inet_bind(), to be safe wrt. future changes */
273 rc = -EINVAL;
274 if (addr_len < sizeof(struct sockaddr_in))
275 goto out;
276
277 rc = -EAFNOSUPPORT;
Karsten Graulaaa4d332018-03-16 15:06:41 +0100278 if (addr->sin_family != AF_INET &&
279 addr->sin_family != AF_INET6 &&
280 addr->sin_family != AF_UNSPEC)
281 goto out;
Ursula Braunac713872017-01-09 16:55:13 +0100282 /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
Karsten Graulaaa4d332018-03-16 15:06:41 +0100283 if (addr->sin_family == AF_UNSPEC &&
284 addr->sin_addr.s_addr != htonl(INADDR_ANY))
Ursula Braunac713872017-01-09 16:55:13 +0100285 goto out;
286
287 lock_sock(sk);
288
289 /* Check if socket is already active */
290 rc = -EINVAL;
Ursula Brauncd206362019-08-02 10:47:50 +0200291 if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
Ursula Braunac713872017-01-09 16:55:13 +0100292 goto out_rel;
293
294 smc->clcsock->sk->sk_reuse = sk->sk_reuse;
295 rc = kernel_bind(smc->clcsock, uaddr, addr_len);
296
297out_rel:
298 release_sock(sk);
299out:
300 return rc;
301}
302
303static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
304 unsigned long mask)
305{
306 /* options we don't get control via setsockopt for */
307 nsk->sk_type = osk->sk_type;
308 nsk->sk_sndbuf = osk->sk_sndbuf;
309 nsk->sk_rcvbuf = osk->sk_rcvbuf;
310 nsk->sk_sndtimeo = osk->sk_sndtimeo;
311 nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
312 nsk->sk_mark = osk->sk_mark;
313 nsk->sk_priority = osk->sk_priority;
314 nsk->sk_rcvlowat = osk->sk_rcvlowat;
315 nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
316 nsk->sk_err = osk->sk_err;
317
318 nsk->sk_flags &= ~mask;
319 nsk->sk_flags |= osk->sk_flags & mask;
320}
321
322#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
323 (1UL << SOCK_KEEPOPEN) | \
324 (1UL << SOCK_LINGER) | \
325 (1UL << SOCK_BROADCAST) | \
326 (1UL << SOCK_TIMESTAMP) | \
327 (1UL << SOCK_DBG) | \
328 (1UL << SOCK_RCVTSTAMP) | \
329 (1UL << SOCK_RCVTSTAMPNS) | \
330 (1UL << SOCK_LOCALROUTE) | \
331 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
332 (1UL << SOCK_RXQ_OVFL) | \
333 (1UL << SOCK_WIFI_STATUS) | \
334 (1UL << SOCK_NOFCS) | \
Deepa Dinamani97184752019-02-02 07:34:51 -0800335 (1UL << SOCK_FILTER_LOCKED) | \
336 (1UL << SOCK_TSTAMP_NEW))
Ursula Braunac713872017-01-09 16:55:13 +0100337/* copy only relevant settings and flags of SOL_SOCKET level from smc to
338 * clc socket (since smc is not called for these options from net/core)
339 */
340static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
341{
342 smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
343}
344
345#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
346 (1UL << SOCK_KEEPOPEN) | \
347 (1UL << SOCK_LINGER) | \
348 (1UL << SOCK_DBG))
349/* copy only settings and flags relevant for smc from clc to smc socket */
350static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
351{
352 smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
353}
354
Karsten Graulb9247542020-04-29 17:10:41 +0200355/* register the new rmb on all links */
Karsten Graul7562a132020-05-01 12:48:01 +0200356static int smcr_lgr_reg_rmbs(struct smc_link *link,
Karsten Graulb9247542020-04-29 17:10:41 +0200357 struct smc_buf_desc *rmb_desc)
358{
Karsten Graul7562a132020-05-01 12:48:01 +0200359 struct smc_link_group *lgr = link->lgr;
360 int i, rc = 0;
Karsten Graulb9247542020-04-29 17:10:41 +0200361
Karsten Grauld5500662020-05-01 12:48:05 +0200362 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
363 if (rc)
364 return rc;
365 /* protect against parallel smc_llc_cli_rkey_exchange() and
366 * parallel smcr_link_reg_rmb()
367 */
368 mutex_lock(&lgr->llc_conf_mutex);
Karsten Graulb9247542020-04-29 17:10:41 +0200369 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
Karsten Graul741a49a2020-07-18 15:06:16 +0200370 if (!smc_link_active(&lgr->lnk[i]))
Karsten Graulb9247542020-04-29 17:10:41 +0200371 continue;
Karsten Graul7562a132020-05-01 12:48:01 +0200372 rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
Karsten Graulb9247542020-04-29 17:10:41 +0200373 if (rc)
Karsten Graul7562a132020-05-01 12:48:01 +0200374 goto out;
Karsten Graulb9247542020-04-29 17:10:41 +0200375 }
Karsten Graul7562a132020-05-01 12:48:01 +0200376
377 /* exchange confirm_rkey msg with peer */
378 rc = smc_llc_do_confirm_rkey(link, rmb_desc);
379 if (rc) {
380 rc = -EFAULT;
381 goto out;
382 }
383 rmb_desc->is_conf_rkey = true;
384out:
Karsten Grauld5500662020-05-01 12:48:05 +0200385 mutex_unlock(&lgr->llc_conf_mutex);
386 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
Karsten Graul7562a132020-05-01 12:48:01 +0200387 return rc;
Karsten Graulb9247542020-04-29 17:10:41 +0200388}
389
390static int smcr_clnt_conf_first_link(struct smc_sock *smc)
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100391{
Karsten Graul387707f2020-04-29 17:10:40 +0200392 struct smc_link *link = smc->conn.lnk;
Karsten Graul0fb0b022020-04-30 15:55:43 +0200393 struct smc_llc_qentry *qentry;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100394 int rc;
395
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100396 /* receive CONFIRM LINK request from server over RoCE fabric */
Karsten Graul0fb0b022020-04-30 15:55:43 +0200397 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
398 SMC_LLC_CONFIRM_LINK);
399 if (!qentry) {
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100400 struct smc_clc_msg_decline dclc;
401
402 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
Ursula Braun2b59f582018-11-22 10:26:39 +0100403 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
Ursula Braun9ed28552018-11-22 10:26:37 +0100404 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100405 }
Karsten Graul649758f2020-05-04 14:18:48 +0200406 smc_llc_save_peer_uid(qentry);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200407 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
408 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
409 if (rc)
Karsten Graul75d320d2018-03-01 13:51:31 +0100410 return SMC_CLC_DECL_RMBE_EC;
411
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100412 rc = smc_ib_modify_qp_rts(link);
413 if (rc)
Karsten Graul603cc142018-07-25 16:35:32 +0200414 return SMC_CLC_DECL_ERR_RDYLNK;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100415
416 smc_wr_remember_qp_attr(link);
Ursula Braun652a1e42017-07-28 13:56:17 +0200417
Karsten Graul7562a132020-05-01 12:48:01 +0200418 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
Karsten Graul603cc142018-07-25 16:35:32 +0200419 return SMC_CLC_DECL_ERR_REGRMB;
Ursula Braun652a1e42017-07-28 13:56:17 +0200420
Karsten Graul0fb0b022020-04-30 15:55:43 +0200421 /* confirm_rkey is implicit on 1st contact */
422 smc->conn.rmb_desc->is_conf_rkey = true;
423
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100424 /* send CONFIRM LINK response over RoCE fabric */
Ursula Braun947541f2018-07-25 16:35:30 +0200425 rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100426 if (rc < 0)
Karsten Graul603cc142018-07-25 16:35:32 +0200427 return SMC_CLC_DECL_TIMEOUT_CL;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100428
Karsten Graul0fb0b022020-04-30 15:55:43 +0200429 smc_llc_link_active(link);
Karsten Graul0a99be42020-05-05 15:01:20 +0200430 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200431
432 /* optional 2nd link, receive ADD LINK request from server */
433 qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
434 SMC_LLC_ADD_LINK);
435 if (!qentry) {
Karsten Graul52bedf32018-03-01 13:51:32 +0100436 struct smc_clc_msg_decline dclc;
437
438 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
Ursula Braun2b59f582018-11-22 10:26:39 +0100439 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200440 if (rc == -EAGAIN)
441 rc = 0; /* no DECLINE received, go with one link */
442 return rc;
Karsten Graul52bedf32018-03-01 13:51:32 +0100443 }
Karsten Graul0fb0b022020-04-30 15:55:43 +0200444 smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
Karsten Graulb1570a82020-05-03 14:38:42 +0200445 smc_llc_cli_add_link(link, qentry);
Karsten Graul75d320d2018-03-01 13:51:31 +0100446 return 0;
Ursula Braun9bf9abe2017-01-09 16:55:21 +0100447}
448
Karsten Graule5c47442021-10-16 11:37:45 +0200449static bool smc_isascii(char *hostname)
450{
451 int i;
452
453 for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
454 if (!isascii(hostname[i]))
455 return false;
456 return true;
457}
458
459static void smc_conn_save_peer_info_fce(struct smc_sock *smc,
460 struct smc_clc_msg_accept_confirm *clc)
461{
462 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
463 (struct smc_clc_msg_accept_confirm_v2 *)clc;
464 struct smc_clc_first_contact_ext *fce;
465 int clc_v2_len;
466
467 if (clc->hdr.version == SMC_V1 ||
468 !(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK))
469 return;
470
471 if (smc->conn.lgr->is_smcd) {
472 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->d1.eid,
473 SMC_MAX_EID_LEN);
474 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
475 d1);
476 } else {
477 memcpy(smc->conn.lgr->negotiated_eid, clc_v2->r1.eid,
478 SMC_MAX_EID_LEN);
479 clc_v2_len = offsetofend(struct smc_clc_msg_accept_confirm_v2,
480 r1);
481 }
482 fce = (struct smc_clc_first_contact_ext *)(((u8 *)clc_v2) + clc_v2_len);
483 smc->conn.lgr->peer_os = fce->os_type;
484 smc->conn.lgr->peer_smc_release = fce->release;
485 if (smc_isascii(fce->hostname))
486 memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
487 SMC_MAX_HOSTNAME_LEN);
488}
489
Hans Wippel41349842018-06-28 19:05:11 +0200490static void smcr_conn_save_peer_info(struct smc_sock *smc,
491 struct smc_clc_msg_accept_confirm *clc)
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100492{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200493 int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200494
Ursula Braun3d9725a2020-09-10 18:48:23 +0200495 smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
496 smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200497 smc->conn.peer_rmbe_size = bufsize;
Ursula Brauncd6851f2017-01-09 16:55:18 +0100498 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
Hans Wippel95d8d2632018-05-18 09:34:13 +0200499 smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100500}
501
Hans Wippel41349842018-06-28 19:05:11 +0200502static void smcd_conn_save_peer_info(struct smc_sock *smc,
503 struct smc_clc_msg_accept_confirm *clc)
504{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200505 int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
Hans Wippel41349842018-06-28 19:05:11 +0200506
Ursula Braun3d9725a2020-09-10 18:48:23 +0200507 smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
508 smc->conn.peer_token = clc->d0.token;
Hans Wippel41349842018-06-28 19:05:11 +0200509 /* msg header takes up space in the buffer */
510 smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
511 atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
512 smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
513}
514
515static void smc_conn_save_peer_info(struct smc_sock *smc,
516 struct smc_clc_msg_accept_confirm *clc)
517{
518 if (smc->conn.lgr->is_smcd)
519 smcd_conn_save_peer_info(smc, clc);
520 else
521 smcr_conn_save_peer_info(smc, clc);
Karsten Graule5c47442021-10-16 11:37:45 +0200522 smc_conn_save_peer_info_fce(smc, clc);
Hans Wippel41349842018-06-28 19:05:11 +0200523}
524
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100525static void smc_link_save_peer_info(struct smc_link *link,
Karsten Graule5c47442021-10-16 11:37:45 +0200526 struct smc_clc_msg_accept_confirm *clc,
527 struct smc_init_info *ini)
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100528{
Ursula Braun3d9725a2020-09-10 18:48:23 +0200529 link->peer_qpn = ntoh24(clc->r0.qpn);
Karsten Graule5c47442021-10-16 11:37:45 +0200530 memcpy(link->peer_gid, ini->peer_gid, SMC_GID_SIZE);
531 memcpy(link->peer_mac, ini->peer_mac, sizeof(link->peer_mac));
Ursula Braun3d9725a2020-09-10 18:48:23 +0200532 link->peer_psn = ntoh24(clc->r0.psn);
533 link->peer_mtu = clc->r0.qp_mtu;
Ursula Braun0cfdd8f2017-01-09 16:55:17 +0100534}
535
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200536static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
537 struct smc_stats_fback *fback_arr)
538{
539 int cnt;
540
541 for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
542 if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
543 fback_arr[cnt].count++;
544 break;
545 }
546 if (!fback_arr[cnt].fback_code) {
547 fback_arr[cnt].fback_code = smc->fallback_rsn;
548 fback_arr[cnt].count++;
549 break;
550 }
551 }
552}
553
554static void smc_stat_fallback(struct smc_sock *smc)
555{
Guvenc Gulce194730a2021-06-16 16:52:58 +0200556 struct net *net = sock_net(&smc->sk);
557
558 mutex_lock(&net->smc.mutex_fback_rsn);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200559 if (smc->listen_smc) {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200560 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
561 net->smc.fback_rsn->srv_fback_cnt++;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200562 } else {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200563 smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
564 net->smc.fback_rsn->clnt_fback_cnt++;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200565 }
Guvenc Gulce194730a2021-06-16 16:52:58 +0200566 mutex_unlock(&net->smc.mutex_fback_rsn);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200567}
568
569static void smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
Ursula Braun07603b22019-04-11 11:17:32 +0200570{
Wen Gu2153bd12021-11-13 15:33:35 +0800571 wait_queue_head_t *smc_wait = sk_sleep(&smc->sk);
572 wait_queue_head_t *clc_wait = sk_sleep(smc->clcsock->sk);
573 unsigned long flags;
574
Ursula Braun07603b22019-04-11 11:17:32 +0200575 smc->use_fallback = true;
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200576 smc->fallback_rsn = reason_code;
577 smc_stat_fallback(smc);
Tony Lu48262602021-11-01 15:39:12 +0800578 trace_smc_switch_to_fallback(smc, reason_code);
Ursula Braun07603b22019-04-11 11:17:32 +0200579 if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
580 smc->clcsock->file = smc->sk.sk_socket->file;
581 smc->clcsock->file->private_data = smc->clcsock;
Ursula Braun67f562e2020-02-14 08:58:59 +0100582 smc->clcsock->wq.fasync_list =
583 smc->sk.sk_socket->wq.fasync_list;
Wen Gu2153bd12021-11-13 15:33:35 +0800584
585 /* There may be some entries remaining in
586 * smc socket->wq, which should be removed
587 * to clcsocket->wq during the fallback.
588 */
589 spin_lock_irqsave(&smc_wait->lock, flags);
Wen Gu7a614322021-11-22 20:32:53 +0800590 spin_lock_nested(&clc_wait->lock, SINGLE_DEPTH_NESTING);
Wen Gu2153bd12021-11-13 15:33:35 +0800591 list_splice_init(&smc_wait->head, &clc_wait->head);
592 spin_unlock(&clc_wait->lock);
593 spin_unlock_irqrestore(&smc_wait->lock, flags);
Ursula Braun07603b22019-04-11 11:17:32 +0200594 }
595}
596
Hans Wippel3b2dec22018-05-18 09:34:18 +0200597/* fall back during connect */
Karsten Graul603cc142018-07-25 16:35:32 +0200598static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200599{
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +0200600 smc_switch_to_fallback(smc, reason_code);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200601 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +0200602 smc->connect_nonblock = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200603 if (smc->sk.sk_state == SMC_INIT)
604 smc->sk.sk_state = SMC_ACTIVE;
605 return 0;
606}
607
608/* decline and fall back during connect */
Ursula Braune8d726c82020-09-26 12:44:32 +0200609static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
610 u8 version)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200611{
Guvenc Gulce194730a2021-06-16 16:52:58 +0200612 struct net *net = sock_net(&smc->sk);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200613 int rc;
614
Ursula Braune1bbdd52018-07-05 16:15:30 +0200615 if (reason_code < 0) { /* error, fallback is not possible */
Guvenc Gulce194730a2021-06-16 16:52:58 +0200616 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200617 if (smc->sk.sk_state == SMC_INIT)
618 sock_put(&smc->sk); /* passive closing */
Hans Wippel3b2dec22018-05-18 09:34:18 +0200619 return reason_code;
Ursula Braune1bbdd52018-07-05 16:15:30 +0200620 }
Karsten Graul603cc142018-07-25 16:35:32 +0200621 if (reason_code != SMC_CLC_DECL_PEERDECL) {
Ursula Braune8d726c82020-09-26 12:44:32 +0200622 rc = smc_clc_send_decline(smc, reason_code, version);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200623 if (rc < 0) {
Guvenc Gulce194730a2021-06-16 16:52:58 +0200624 this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
Ursula Braune1bbdd52018-07-05 16:15:30 +0200625 if (smc->sk.sk_state == SMC_INIT)
626 sock_put(&smc->sk); /* passive closing */
Hans Wippel3b2dec22018-05-18 09:34:18 +0200627 return rc;
Ursula Braune1bbdd52018-07-05 16:15:30 +0200628 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200629 }
Karsten Graul603cc142018-07-25 16:35:32 +0200630 return smc_connect_fallback(smc, reason_code);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200631}
632
Karsten Graul8cf3f3e2020-12-01 20:20:36 +0100633static void smc_conn_abort(struct smc_sock *smc, int local_first)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200634{
Ursula Braun5ac54d82020-09-10 18:48:21 +0200635 if (local_first)
Ursula Braun51e3dfa2020-02-25 16:34:36 +0100636 smc_lgr_cleanup_early(&smc->conn);
637 else
638 smc_conn_free(&smc->conn);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200639}
640
641/* check if there is a rdma device available for this connection. */
642/* called for connect and listen */
Karsten Graul228bae02019-04-12 12:57:28 +0200643static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200644{
Hans Wippel3b2dec22018-05-18 09:34:18 +0200645 /* PNET table look up: search active ib_device and port
646 * within same PNETID that also contains the ethernet device
647 * used for the internal TCP socket
648 */
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200649 smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
Karsten Graul42042db2021-10-16 11:37:44 +0200650 if (!ini->check_smcrv2 && !ini->ib_dev)
651 return SMC_CLC_DECL_NOSMCRDEV;
652 if (ini->check_smcrv2 && !ini->smcrv2.ib_dev_v2)
Karsten Graul9aa68d22019-04-12 12:57:29 +0200653 return SMC_CLC_DECL_NOSMCRDEV;
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200654 return 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200655}
656
Hans Wippel41349842018-06-28 19:05:11 +0200657/* check if there is an ISM device available for this connection. */
658/* called for connect and listen */
Karsten Graul228bae02019-04-12 12:57:28 +0200659static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +0200660{
661 /* Find ISM device with same PNETID as connecting interface */
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200662 smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
Ursula Braun3fc64932020-09-26 12:44:23 +0200663 if (!ini->ism_dev[0])
Karsten Graul9aa68d22019-04-12 12:57:29 +0200664 return SMC_CLC_DECL_NOSMCDDEV;
Ursula Braun8caaccf2020-09-26 12:44:25 +0200665 else
666 ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
Hans Wippel41349842018-06-28 19:05:11 +0200667 return 0;
668}
669
Karsten Graul839d6962020-10-02 17:09:26 +0200670/* is chid unique for the ism devices that are already determined? */
671static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
672 int cnt)
673{
674 int i = (!ini->ism_dev[0]) ? 1 : 0;
675
676 for (; i < cnt; i++)
677 if (ini->ism_chid[i] == chid)
678 return false;
679 return true;
680}
681
Ursula Braund70bf4f2020-09-26 12:44:27 +0200682/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
683 * PNETID matching net_device)
684 */
685static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
686 struct smc_init_info *ini)
687{
688 int rc = SMC_CLC_DECL_NOSMCDDEV;
689 struct smcd_dev *smcd;
690 int i = 1;
Karsten Graul839d6962020-10-02 17:09:26 +0200691 u16 chid;
Ursula Braund70bf4f2020-09-26 12:44:27 +0200692
693 if (smcd_indicated(ini->smc_type_v1))
694 rc = 0; /* already initialized for V1 */
695 mutex_lock(&smcd_dev_list.mutex);
696 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
697 if (smcd->going_away || smcd == ini->ism_dev[0])
698 continue;
Karsten Graul839d6962020-10-02 17:09:26 +0200699 chid = smc_ism_get_chid(smcd);
700 if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
701 continue;
Ursula Braund70bf4f2020-09-26 12:44:27 +0200702 if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
703 smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
704 ini->ism_dev[i] = smcd;
Karsten Graul839d6962020-10-02 17:09:26 +0200705 ini->ism_chid[i] = chid;
Ursula Braund70bf4f2020-09-26 12:44:27 +0200706 ini->is_smcd = true;
707 rc = 0;
708 i++;
709 if (i > SMC_MAX_ISM_DEVS)
710 break;
711 }
712 }
713 mutex_unlock(&smcd_dev_list.mutex);
714 ini->ism_offered_cnt = i - 1;
715 if (!ini->ism_dev[0] && !ini->ism_dev[1])
716 ini->smcd_version = 0;
717
718 return rc;
719}
720
Hans Wippel41349842018-06-28 19:05:11 +0200721/* Check for VLAN ID and register it on ISM device just for CLC handshake */
722static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200723 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +0200724{
Ursula Braun3fc64932020-09-26 12:44:23 +0200725 if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
Karsten Graul7a62725a2019-04-12 12:57:30 +0200726 return SMC_CLC_DECL_ISMVLANERR;
Hans Wippel41349842018-06-28 19:05:11 +0200727 return 0;
728}
729
Ursula Braund70bf4f2020-09-26 12:44:27 +0200730static int smc_find_proposal_devices(struct smc_sock *smc,
731 struct smc_init_info *ini)
732{
733 int rc = 0;
734
735 /* check if there is an ism device available */
Karsten Graul42042db2021-10-16 11:37:44 +0200736 if (!(ini->smcd_version & SMC_V1) ||
737 smc_find_ism_device(smc, ini) ||
738 smc_connect_ism_vlan_setup(smc, ini))
739 ini->smcd_version &= ~SMC_V1;
740 /* else ISM V1 is supported for this connection */
741
742 /* check if there is an rdma device available */
743 if (!(ini->smcr_version & SMC_V1) ||
744 smc_find_rdma_device(smc, ini))
745 ini->smcr_version &= ~SMC_V1;
746 /* else RDMA is supported for this connection */
747
748 ini->smc_type_v1 = smc_indicated_type(ini->smcd_version & SMC_V1,
749 ini->smcr_version & SMC_V1);
750
751 /* check if there is an ism v2 device available */
752 if (!(ini->smcd_version & SMC_V2) ||
753 !smc_ism_is_v2_capable() ||
754 smc_find_ism_v2_device_clnt(smc, ini))
755 ini->smcd_version &= ~SMC_V2;
756
757 /* check if there is an rdma v2 device available */
758 ini->check_smcrv2 = true;
759 ini->smcrv2.saddr = smc->clcsock->sk->sk_rcv_saddr;
760 if (!(ini->smcr_version & SMC_V2) ||
761 smc->clcsock->sk->sk_family != AF_INET ||
762 !smc_clc_ueid_count() ||
763 smc_find_rdma_device(smc, ini))
764 ini->smcr_version &= ~SMC_V2;
765 ini->check_smcrv2 = false;
766
767 ini->smc_type_v2 = smc_indicated_type(ini->smcd_version & SMC_V2,
768 ini->smcr_version & SMC_V2);
Ursula Braund70bf4f2020-09-26 12:44:27 +0200769
770 /* if neither ISM nor RDMA are supported, fallback */
Karsten Graul42042db2021-10-16 11:37:44 +0200771 if (ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
Ursula Braund70bf4f2020-09-26 12:44:27 +0200772 rc = SMC_CLC_DECL_NOSMCDEV;
773
774 return rc;
775}
776
Hans Wippel41349842018-06-28 19:05:11 +0200777/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
778 * used, the VLAN ID will be registered again during the connection setup.
779 */
Ursula Braund70bf4f2020-09-26 12:44:27 +0200780static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200781 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +0200782{
Ursula Braund70bf4f2020-09-26 12:44:27 +0200783 if (!smcd_indicated(ini->smc_type_v1))
Hans Wippel41349842018-06-28 19:05:11 +0200784 return 0;
Ursula Braun3fc64932020-09-26 12:44:23 +0200785 if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
Hans Wippel41349842018-06-28 19:05:11 +0200786 return SMC_CLC_DECL_CNFERR;
787 return 0;
788}
789
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200790#define SMC_CLC_MAX_ACCEPT_LEN \
791 (sizeof(struct smc_clc_msg_accept_confirm_v2) + \
Ursula Braunb81a5eb2020-09-26 12:44:31 +0200792 sizeof(struct smc_clc_first_contact_ext) + \
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200793 sizeof(struct smc_clc_msg_trail))
794
Hans Wippel3b2dec22018-05-18 09:34:18 +0200795/* CLC handshake during connect */
Ursula Braund70bf4f2020-09-26 12:44:27 +0200796static int smc_connect_clc(struct smc_sock *smc,
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200797 struct smc_clc_msg_accept_confirm_v2 *aclc2,
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200798 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200799{
800 int rc = 0;
801
802 /* do inband token exchange */
Ursula Braund70bf4f2020-09-26 12:44:27 +0200803 rc = smc_clc_send_proposal(smc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200804 if (rc)
805 return rc;
806 /* receive SMC Accept CLC message */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200807 return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
808 SMC_CLC_ACCEPT, CLC_WAIT_TIME);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200809}
810
Karsten Graulb4ba4652021-10-16 11:37:50 +0200811void smc_fill_gid_list(struct smc_link_group *lgr,
812 struct smc_gidlist *gidlist,
813 struct smc_ib_device *known_dev, u8 *known_gid)
Karsten Graule5c47442021-10-16 11:37:45 +0200814{
815 struct smc_init_info *alt_ini = NULL;
816
817 memset(gidlist, 0, sizeof(*gidlist));
818 memcpy(gidlist->list[gidlist->len++], known_gid, SMC_GID_SIZE);
819
820 alt_ini = kzalloc(sizeof(*alt_ini), GFP_KERNEL);
821 if (!alt_ini)
822 goto out;
823
824 alt_ini->vlan_id = lgr->vlan_id;
825 alt_ini->check_smcrv2 = true;
826 alt_ini->smcrv2.saddr = lgr->saddr;
827 smc_pnet_find_alt_roce(lgr, alt_ini, known_dev);
828
829 if (!alt_ini->smcrv2.ib_dev_v2)
830 goto out;
831
832 memcpy(gidlist->list[gidlist->len++], alt_ini->smcrv2.ib_gid_v2,
833 SMC_GID_SIZE);
834
835out:
836 kfree(alt_ini);
837}
838
839static int smc_connect_rdma_v2_prepare(struct smc_sock *smc,
840 struct smc_clc_msg_accept_confirm *aclc,
841 struct smc_init_info *ini)
842{
843 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
844 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
845 struct smc_clc_first_contact_ext *fce =
846 (struct smc_clc_first_contact_ext *)
847 (((u8 *)clc_v2) + sizeof(*clc_v2));
848
849 if (!ini->first_contact_peer || aclc->hdr.version == SMC_V1)
850 return 0;
851
852 if (fce->v2_direct) {
853 memcpy(ini->smcrv2.nexthop_mac, &aclc->r0.lcl.mac, ETH_ALEN);
854 ini->smcrv2.uses_gateway = false;
855 } else {
856 if (smc_ib_find_route(smc->clcsock->sk->sk_rcv_saddr,
857 smc_ib_gid_to_ipv4(aclc->r0.lcl.gid),
858 ini->smcrv2.nexthop_mac,
859 &ini->smcrv2.uses_gateway))
860 return SMC_CLC_DECL_NOROUTE;
861 if (!ini->smcrv2.uses_gateway) {
862 /* mismatch: peer claims indirect, but its direct */
863 return SMC_CLC_DECL_NOINDIRECT;
864 }
865 }
866 return 0;
867}
868
Ursula Brauna046d572017-01-09 16:55:16 +0100869/* setup for RDMA connection of client */
Hans Wippel3b2dec22018-05-18 09:34:18 +0200870static int smc_connect_rdma(struct smc_sock *smc,
871 struct smc_clc_msg_accept_confirm *aclc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200872 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +0200873{
Karsten Graul0fb0b022020-04-30 15:55:43 +0200874 int i, reason_code = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200875 struct smc_link *link;
Karsten Graule5c47442021-10-16 11:37:45 +0200876 u8 *eid = NULL;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200877
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200878 ini->is_smcd = false;
Ursula Braun3d9725a2020-09-10 18:48:23 +0200879 ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
Ursula Braunf1eb02f2020-09-26 12:44:20 +0200880 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
Karsten Graule5c47442021-10-16 11:37:45 +0200881 memcpy(ini->peer_systemid, aclc->r0.lcl.id_for_peer, SMC_SYSTEMID_LEN);
882 memcpy(ini->peer_gid, aclc->r0.lcl.gid, SMC_GID_SIZE);
883 memcpy(ini->peer_mac, aclc->r0.lcl.mac, ETH_ALEN);
884
885 reason_code = smc_connect_rdma_v2_prepare(smc, aclc, ini);
886 if (reason_code)
887 return reason_code;
Karsten Graulbc36d2f2019-04-12 12:57:26 +0200888
Hans Wippel72a36a82019-02-07 15:56:18 +0100889 mutex_lock(&smc_client_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +0200890 reason_code = smc_conn_create(smc, ini);
891 if (reason_code) {
Hans Wippel72a36a82019-02-07 15:56:18 +0100892 mutex_unlock(&smc_client_lgr_pending);
893 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200894 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200895
896 smc_conn_save_peer_info(smc, aclc);
897
Ursula Braun5ac54d82020-09-10 18:48:21 +0200898 if (ini->first_contact_local) {
Karsten Graul0fb0b022020-04-30 15:55:43 +0200899 link = smc->conn.lnk;
900 } else {
901 /* set link that was assigned by server */
902 link = NULL;
903 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
904 struct smc_link *l = &smc->conn.lgr->lnk[i];
905
Ursula Braun3d9725a2020-09-10 18:48:23 +0200906 if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
907 !memcmp(l->peer_gid, &aclc->r0.lcl.gid,
908 SMC_GID_SIZE) &&
Karsten Graule5c47442021-10-16 11:37:45 +0200909 (aclc->hdr.version > SMC_V1 ||
910 !memcmp(l->peer_mac, &aclc->r0.lcl.mac,
911 sizeof(l->peer_mac)))) {
Karsten Graul0fb0b022020-04-30 15:55:43 +0200912 link = l;
913 break;
914 }
915 }
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200916 if (!link) {
917 reason_code = SMC_CLC_DECL_NOSRVLINK;
918 goto connect_abort;
919 }
Guvenc Gulce64513d22021-08-09 11:05:57 +0200920 smc_switch_link_and_count(&smc->conn, link);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200921 }
922
Hans Wippel3b2dec22018-05-18 09:34:18 +0200923 /* create send buffer and rmb */
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200924 if (smc_buf_create(smc, false)) {
925 reason_code = SMC_CLC_DECL_MEM;
926 goto connect_abort;
927 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200928
Ursula Braun5ac54d82020-09-10 18:48:21 +0200929 if (ini->first_contact_local)
Karsten Graule5c47442021-10-16 11:37:45 +0200930 smc_link_save_peer_info(link, aclc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200931
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200932 if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
933 reason_code = SMC_CLC_DECL_ERR_RTOK;
934 goto connect_abort;
935 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200936
937 smc_close_init(smc);
938 smc_rx_init(smc);
939
Ursula Braun5ac54d82020-09-10 18:48:21 +0200940 if (ini->first_contact_local) {
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200941 if (smc_ib_ready_link(link)) {
942 reason_code = SMC_CLC_DECL_ERR_RDYLNK;
943 goto connect_abort;
944 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200945 } else {
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200946 if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
947 reason_code = SMC_CLC_DECL_ERR_REGRMB;
948 goto connect_abort;
949 }
Hans Wippel3b2dec22018-05-18 09:34:18 +0200950 }
951 smc_rmb_sync_sg_for_device(&smc->conn);
952
Karsten Graule5c47442021-10-16 11:37:45 +0200953 if (aclc->hdr.version > SMC_V1) {
954 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
955 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
956
957 eid = clc_v2->r1.eid;
958 if (ini->first_contact_local)
959 smc_fill_gid_list(link->lgr, &ini->smcrv2.gidlist,
960 link->smcibdev, link->gid);
961 }
962
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200963 reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
Karsten Graule5c47442021-10-16 11:37:45 +0200964 aclc->hdr.version, eid, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200965 if (reason_code)
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200966 goto connect_abort;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200967
968 smc_tx_init(smc);
969
Ursula Braun5ac54d82020-09-10 18:48:21 +0200970 if (ini->first_contact_local) {
Hans Wippel3b2dec22018-05-18 09:34:18 +0200971 /* QP confirmation over RoCE fabric */
Karsten Graul0fb0b022020-04-30 15:55:43 +0200972 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
Karsten Graulb9247542020-04-29 17:10:41 +0200973 reason_code = smcr_clnt_conf_first_link(smc);
Karsten Graul0fb0b022020-04-30 15:55:43 +0200974 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200975 if (reason_code)
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200976 goto connect_abort;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200977 }
Hans Wippel72a36a82019-02-07 15:56:18 +0100978 mutex_unlock(&smc_client_lgr_pending);
Hans Wippel3b2dec22018-05-18 09:34:18 +0200979
980 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +0200981 smc->connect_nonblock = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200982 if (smc->sk.sk_state == SMC_INIT)
983 smc->sk.sk_state = SMC_ACTIVE;
984
985 return 0;
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200986connect_abort:
Karsten Graul8cf3f3e2020-12-01 20:20:36 +0100987 smc_conn_abort(smc, ini->first_contact_local);
Karsten Graulc60a2ce2020-10-07 22:57:41 +0200988 mutex_unlock(&smc_client_lgr_pending);
989 smc->connect_nonblock = 0;
990
991 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +0200992}
993
Ursula Brauna7c9c5f2020-09-26 12:44:30 +0200994/* The server has chosen one of the proposed ISM devices for the communication.
995 * Determine from the CHID of the received CLC ACCEPT the ISM device chosen.
996 */
997static int
998smc_v2_determine_accepted_chid(struct smc_clc_msg_accept_confirm_v2 *aclc,
999 struct smc_init_info *ini)
1000{
1001 int i;
1002
1003 for (i = 0; i < ini->ism_offered_cnt + 1; i++) {
Karsten Graule5c47442021-10-16 11:37:45 +02001004 if (ini->ism_chid[i] == ntohs(aclc->d1.chid)) {
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001005 ini->ism_selected = i;
1006 return 0;
1007 }
1008 }
1009
1010 return -EPROTO;
1011}
1012
Hans Wippel41349842018-06-28 19:05:11 +02001013/* setup for ISM connection of client */
1014static int smc_connect_ism(struct smc_sock *smc,
1015 struct smc_clc_msg_accept_confirm *aclc,
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001016 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001017{
Karsten Graulfa086662021-09-14 10:35:05 +02001018 u8 *eid = NULL;
Hans Wippel41349842018-06-28 19:05:11 +02001019 int rc = 0;
1020
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001021 ini->is_smcd = true;
Ursula Braunf1eb02f2020-09-26 12:44:20 +02001022 ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
Karsten Graulbc36d2f2019-04-12 12:57:26 +02001023
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001024 if (aclc->hdr.version == SMC_V2) {
1025 struct smc_clc_msg_accept_confirm_v2 *aclc_v2 =
1026 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1027
1028 rc = smc_v2_determine_accepted_chid(aclc_v2, ini);
1029 if (rc)
1030 return rc;
1031 }
1032 ini->ism_peer_gid[ini->ism_selected] = aclc->d0.gid;
1033
Hans Wippel72a36a82019-02-07 15:56:18 +01001034 /* there is only one lgr role for SMC-D; use server lock */
1035 mutex_lock(&smc_server_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +02001036 rc = smc_conn_create(smc, ini);
1037 if (rc) {
Hans Wippel72a36a82019-02-07 15:56:18 +01001038 mutex_unlock(&smc_server_lgr_pending);
Karsten Graul7a62725a2019-04-12 12:57:30 +02001039 return rc;
Hans Wippel72a36a82019-02-07 15:56:18 +01001040 }
Hans Wippel41349842018-06-28 19:05:11 +02001041
1042 /* Create send and receive buffers */
Karsten Graul72b7f6c2020-07-26 20:34:28 +02001043 rc = smc_buf_create(smc, true);
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001044 if (rc) {
1045 rc = (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB : SMC_CLC_DECL_MEM;
1046 goto connect_abort;
1047 }
Hans Wippel41349842018-06-28 19:05:11 +02001048
1049 smc_conn_save_peer_info(smc, aclc);
1050 smc_close_init(smc);
1051 smc_rx_init(smc);
1052 smc_tx_init(smc);
1053
Karsten Graulfa086662021-09-14 10:35:05 +02001054 if (aclc->hdr.version > SMC_V1) {
1055 struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
1056 (struct smc_clc_msg_accept_confirm_v2 *)aclc;
1057
Karsten Graule5c47442021-10-16 11:37:45 +02001058 eid = clc_v2->d1.eid;
Karsten Graulfa086662021-09-14 10:35:05 +02001059 }
1060
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001061 rc = smc_clc_send_confirm(smc, ini->first_contact_local,
Karsten Graule5c47442021-10-16 11:37:45 +02001062 aclc->hdr.version, eid, NULL);
Hans Wippel41349842018-06-28 19:05:11 +02001063 if (rc)
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001064 goto connect_abort;
Hans Wippel72a36a82019-02-07 15:56:18 +01001065 mutex_unlock(&smc_server_lgr_pending);
Hans Wippel41349842018-06-28 19:05:11 +02001066
1067 smc_copy_sock_settings_to_clc(smc);
Ursula Braun50717a32019-04-12 12:57:23 +02001068 smc->connect_nonblock = 0;
Hans Wippel41349842018-06-28 19:05:11 +02001069 if (smc->sk.sk_state == SMC_INIT)
1070 smc->sk.sk_state = SMC_ACTIVE;
1071
1072 return 0;
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001073connect_abort:
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001074 smc_conn_abort(smc, ini->first_contact_local);
Karsten Graulc60a2ce2020-10-07 22:57:41 +02001075 mutex_unlock(&smc_server_lgr_pending);
1076 smc->connect_nonblock = 0;
1077
1078 return rc;
Hans Wippel41349842018-06-28 19:05:11 +02001079}
1080
Ursula Braund70bf4f2020-09-26 12:44:27 +02001081/* check if received accept type and version matches a proposed one */
1082static int smc_connect_check_aclc(struct smc_init_info *ini,
1083 struct smc_clc_msg_accept_confirm *aclc)
1084{
Karsten Graul42042db2021-10-16 11:37:44 +02001085 if (aclc->hdr.typev1 != SMC_TYPE_R &&
1086 aclc->hdr.typev1 != SMC_TYPE_D)
Ursula Braund70bf4f2020-09-26 12:44:27 +02001087 return SMC_CLC_DECL_MODEUNSUPP;
1088
Karsten Graul42042db2021-10-16 11:37:44 +02001089 if (aclc->hdr.version >= SMC_V2) {
1090 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1091 !smcr_indicated(ini->smc_type_v2)) ||
1092 (aclc->hdr.typev1 == SMC_TYPE_D &&
1093 !smcd_indicated(ini->smc_type_v2)))
1094 return SMC_CLC_DECL_MODEUNSUPP;
1095 } else {
1096 if ((aclc->hdr.typev1 == SMC_TYPE_R &&
1097 !smcr_indicated(ini->smc_type_v1)) ||
1098 (aclc->hdr.typev1 == SMC_TYPE_D &&
1099 !smcd_indicated(ini->smc_type_v1)))
1100 return SMC_CLC_DECL_MODEUNSUPP;
1101 }
1102
Ursula Braund70bf4f2020-09-26 12:44:27 +02001103 return 0;
1104}
1105
Hans Wippel3b2dec22018-05-18 09:34:18 +02001106/* perform steps before actually connecting */
1107static int __smc_connect(struct smc_sock *smc)
Ursula Brauna046d572017-01-09 16:55:16 +01001108{
Guvenc Gulce49407ae2020-12-01 20:20:42 +01001109 u8 version = smc_ism_is_v2_capable() ? SMC_V2 : SMC_V1;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001110 struct smc_clc_msg_accept_confirm_v2 *aclc2;
1111 struct smc_clc_msg_accept_confirm *aclc;
Ursula Braun3fc64932020-09-26 12:44:23 +02001112 struct smc_init_info *ini = NULL;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001113 u8 *buf = NULL;
Ursula Brauna046d572017-01-09 16:55:16 +01001114 int rc = 0;
Ursula Brauna046d572017-01-09 16:55:16 +01001115
Ursula Braunee9dfbe2018-04-26 17:18:21 +02001116 if (smc->use_fallback)
Karsten Graul603cc142018-07-25 16:35:32 +02001117 return smc_connect_fallback(smc, smc->fallback_rsn);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02001118
Hans Wippel3b2dec22018-05-18 09:34:18 +02001119 /* if peer has not signalled SMC-capability, fall back */
1120 if (!tcp_sk(smc->clcsock->sk)->syn_smc)
Karsten Graul603cc142018-07-25 16:35:32 +02001121 return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC);
Ursula Braunc5c1cc92017-10-25 11:01:46 +02001122
Ursula Braune8d726c82020-09-26 12:44:32 +02001123 /* IPSec connections opt out of SMC optimizations */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001124 if (using_ipsec(smc))
Ursula Braune8d726c82020-09-26 12:44:32 +02001125 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC,
1126 version);
Ursula Brauna046d572017-01-09 16:55:16 +01001127
Ursula Braun3fc64932020-09-26 12:44:23 +02001128 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1129 if (!ini)
Ursula Braune8d726c82020-09-26 12:44:32 +02001130 return smc_connect_decline_fallback(smc, SMC_CLC_DECL_MEM,
1131 version);
Ursula Braun3fc64932020-09-26 12:44:23 +02001132
Karsten Graul42042db2021-10-16 11:37:44 +02001133 ini->smcd_version = SMC_V1 | SMC_V2;
1134 ini->smcr_version = SMC_V1 | SMC_V2;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001135 ini->smc_type_v1 = SMC_TYPE_B;
Karsten Graul42042db2021-10-16 11:37:44 +02001136 ini->smc_type_v2 = SMC_TYPE_B;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001137
Karsten Graulfba7e8e2019-04-12 12:57:27 +02001138 /* get vlan id from IP device */
Ursula Braun3fc64932020-09-26 12:44:23 +02001139 if (smc_vlan_by_tcpsk(smc->clcsock, ini)) {
Ursula Braund70bf4f2020-09-26 12:44:27 +02001140 ini->smcd_version &= ~SMC_V1;
Karsten Graul42042db2021-10-16 11:37:44 +02001141 ini->smcr_version = 0;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001142 ini->smc_type_v1 = SMC_TYPE_N;
1143 if (!ini->smcd_version) {
1144 rc = SMC_CLC_DECL_GETVLANERR;
1145 goto fallback;
1146 }
Ursula Braun3fc64932020-09-26 12:44:23 +02001147 }
Hans Wippel41349842018-06-28 19:05:11 +02001148
Ursula Braund70bf4f2020-09-26 12:44:27 +02001149 rc = smc_find_proposal_devices(smc, ini);
1150 if (rc)
1151 goto fallback;
Ursula Brauna046d572017-01-09 16:55:16 +01001152
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001153 buf = kzalloc(SMC_CLC_MAX_ACCEPT_LEN, GFP_KERNEL);
1154 if (!buf) {
1155 rc = SMC_CLC_DECL_MEM;
1156 goto fallback;
1157 }
1158 aclc2 = (struct smc_clc_msg_accept_confirm_v2 *)buf;
1159 aclc = (struct smc_clc_msg_accept_confirm *)aclc2;
1160
Hans Wippel3b2dec22018-05-18 09:34:18 +02001161 /* perform CLC handshake */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001162 rc = smc_connect_clc(smc, aclc2, ini);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001163 if (rc)
1164 goto vlan_cleanup;
1165
1166 /* check if smc modes and versions of CLC proposal and accept match */
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001167 rc = smc_connect_check_aclc(ini, aclc);
Karsten Graul0530bd62020-11-18 22:40:37 +01001168 version = aclc->hdr.version == SMC_V1 ? SMC_V1 : SMC_V2;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001169 if (rc)
1170 goto vlan_cleanup;
Ursula Brauna046d572017-01-09 16:55:16 +01001171
Hans Wippel41349842018-06-28 19:05:11 +02001172 /* depending on previous steps, connect using rdma or ism */
Karsten Graul42042db2021-10-16 11:37:44 +02001173 if (aclc->hdr.typev1 == SMC_TYPE_R) {
1174 ini->smcr_version = version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001175 rc = smc_connect_rdma(smc, aclc, ini);
Karsten Graul42042db2021-10-16 11:37:44 +02001176 } else if (aclc->hdr.typev1 == SMC_TYPE_D) {
1177 ini->smcd_version = version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001178 rc = smc_connect_ism(smc, aclc, ini);
Karsten Graul42042db2021-10-16 11:37:44 +02001179 }
Ursula Braund70bf4f2020-09-26 12:44:27 +02001180 if (rc)
1181 goto vlan_cleanup;
Ursula Brauna046d572017-01-09 16:55:16 +01001182
Guvenc Gulce194730a2021-06-16 16:52:58 +02001183 SMC_STAT_CLNT_SUCC_INC(sock_net(smc->clcsock->sk), aclc);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001184 smc_connect_ism_vlan_cleanup(smc, ini);
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001185 kfree(buf);
Ursula Braun3fc64932020-09-26 12:44:23 +02001186 kfree(ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001187 return 0;
Ursula Braund70bf4f2020-09-26 12:44:27 +02001188
1189vlan_cleanup:
1190 smc_connect_ism_vlan_cleanup(smc, ini);
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001191 kfree(buf);
Ursula Braund70bf4f2020-09-26 12:44:27 +02001192fallback:
1193 kfree(ini);
Ursula Braune8d726c82020-09-26 12:44:32 +02001194 return smc_connect_decline_fallback(smc, rc, version);
Ursula Brauna046d572017-01-09 16:55:16 +01001195}
1196
Ursula Braun24ac3a02018-06-27 17:59:50 +02001197static void smc_connect_work(struct work_struct *work)
1198{
1199 struct smc_sock *smc = container_of(work, struct smc_sock,
1200 connect_work);
Ursula Braun50717a32019-04-12 12:57:23 +02001201 long timeo = smc->sk.sk_sndtimeo;
1202 int rc = 0;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001203
Ursula Braun50717a32019-04-12 12:57:23 +02001204 if (!timeo)
1205 timeo = MAX_SCHEDULE_TIMEOUT;
1206 lock_sock(smc->clcsock->sk);
Ursula Braun24ac3a02018-06-27 17:59:50 +02001207 if (smc->clcsock->sk->sk_err) {
1208 smc->sk.sk_err = smc->clcsock->sk->sk_err;
Ursula Braun50717a32019-04-12 12:57:23 +02001209 } else if ((1 << smc->clcsock->sk->sk_state) &
Wen Guf3a3a0f2021-10-28 15:13:47 +08001210 (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
Ursula Braun50717a32019-04-12 12:57:23 +02001211 rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo);
1212 if ((rc == -EPIPE) &&
1213 ((1 << smc->clcsock->sk->sk_state) &
1214 (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)))
1215 rc = 0;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001216 }
Ursula Braun50717a32019-04-12 12:57:23 +02001217 release_sock(smc->clcsock->sk);
1218 lock_sock(&smc->sk);
1219 if (rc != 0 || smc->sk.sk_err) {
1220 smc->sk.sk_state = SMC_CLOSED;
1221 if (rc == -EPIPE || rc == -EAGAIN)
1222 smc->sk.sk_err = EPIPE;
1223 else if (signal_pending(current))
1224 smc->sk.sk_err = -sock_intr_errno(timeo);
Ursula Braun6d6dd522019-11-12 16:03:41 +01001225 sock_put(&smc->sk); /* passive closing */
Ursula Braun24ac3a02018-06-27 17:59:50 +02001226 goto out;
1227 }
1228
1229 rc = __smc_connect(smc);
1230 if (rc < 0)
1231 smc->sk.sk_err = -rc;
1232
1233out:
Ursula Braun07603b22019-04-11 11:17:32 +02001234 if (!sock_flag(&smc->sk, SOCK_DEAD)) {
1235 if (smc->sk.sk_err) {
1236 smc->sk.sk_state_change(&smc->sk);
1237 } else { /* allow polling before and after fallback decision */
1238 smc->clcsock->sk->sk_write_space(smc->clcsock->sk);
1239 smc->sk.sk_write_space(&smc->sk);
1240 }
1241 }
Ursula Braun24ac3a02018-06-27 17:59:50 +02001242 release_sock(&smc->sk);
1243}
1244
Ursula Braunac713872017-01-09 16:55:13 +01001245static int smc_connect(struct socket *sock, struct sockaddr *addr,
1246 int alen, int flags)
1247{
1248 struct sock *sk = sock->sk;
1249 struct smc_sock *smc;
1250 int rc = -EINVAL;
1251
1252 smc = smc_sk(sk);
1253
1254 /* separate smc parameter checking to be safe */
1255 if (alen < sizeof(addr->sa_family))
1256 goto out_err;
Karsten Graulaaa4d332018-03-16 15:06:41 +01001257 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
Ursula Braunac713872017-01-09 16:55:13 +01001258 goto out_err;
1259
1260 lock_sock(sk);
1261 switch (sk->sk_state) {
1262 default:
1263 goto out;
1264 case SMC_ACTIVE:
1265 rc = -EISCONN;
1266 goto out;
1267 case SMC_INIT:
Ursula Braunac713872017-01-09 16:55:13 +01001268 break;
1269 }
1270
1271 smc_copy_sock_settings_to_clc(smc);
Ursula Braunc5c1cc92017-10-25 11:01:46 +02001272 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
Ursula Braun50717a32019-04-12 12:57:23 +02001273 if (smc->connect_nonblock) {
1274 rc = -EALREADY;
1275 goto out;
1276 }
1277 rc = kernel_connect(smc->clcsock, addr, alen, flags);
1278 if (rc && rc != -EINPROGRESS)
1279 goto out;
Ursula Braun301428e2019-10-29 12:41:26 +01001280
1281 sock_hold(&smc->sk); /* sock put in passive closing */
Ursula Braun86434742019-12-12 22:35:58 +01001282 if (smc->use_fallback)
1283 goto out;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001284 if (flags & O_NONBLOCK) {
Karsten Graul22ef4732020-09-10 18:48:29 +02001285 if (queue_work(smc_hs_wq, &smc->connect_work))
Ursula Braun50717a32019-04-12 12:57:23 +02001286 smc->connect_nonblock = 1;
Ursula Braun24ac3a02018-06-27 17:59:50 +02001287 rc = -EINPROGRESS;
1288 } else {
Ursula Braun24ac3a02018-06-27 17:59:50 +02001289 rc = __smc_connect(smc);
1290 if (rc < 0)
1291 goto out;
1292 else
1293 rc = 0; /* success cases including fallback */
1294 }
Ursula Braunac713872017-01-09 16:55:13 +01001295
1296out:
1297 release_sock(sk);
1298out_err:
1299 return rc;
1300}
1301
1302static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
1303{
Ursula Braun3163c502018-01-24 10:28:12 +01001304 struct socket *new_clcsock = NULL;
1305 struct sock *lsk = &lsmc->sk;
Ursula Braunac713872017-01-09 16:55:13 +01001306 struct sock *new_sk;
Myungho Jung78abe3d2018-12-18 09:02:25 -08001307 int rc = -EINVAL;
Ursula Braunac713872017-01-09 16:55:13 +01001308
Ursula Braun3163c502018-01-24 10:28:12 +01001309 release_sock(lsk);
Karsten Graulaaa4d332018-03-16 15:06:41 +01001310 new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol);
Ursula Braunac713872017-01-09 16:55:13 +01001311 if (!new_sk) {
1312 rc = -ENOMEM;
Ursula Braun3163c502018-01-24 10:28:12 +01001313 lsk->sk_err = ENOMEM;
Ursula Braunac713872017-01-09 16:55:13 +01001314 *new_smc = NULL;
Ursula Braun3163c502018-01-24 10:28:12 +01001315 lock_sock(lsk);
Ursula Braunac713872017-01-09 16:55:13 +01001316 goto out;
1317 }
1318 *new_smc = smc_sk(new_sk);
1319
Myungho Jung78abe3d2018-12-18 09:02:25 -08001320 mutex_lock(&lsmc->clcsock_release_lock);
1321 if (lsmc->clcsock)
Ursula Brauna60a2b12020-09-10 18:48:20 +02001322 rc = kernel_accept(lsmc->clcsock, &new_clcsock, SOCK_NONBLOCK);
Myungho Jung78abe3d2018-12-18 09:02:25 -08001323 mutex_unlock(&lsmc->clcsock_release_lock);
Ursula Braun3163c502018-01-24 10:28:12 +01001324 lock_sock(lsk);
Ursula Brauna60a2b12020-09-10 18:48:20 +02001325 if (rc < 0 && rc != -EAGAIN)
Ursula Braun3163c502018-01-24 10:28:12 +01001326 lsk->sk_err = -rc;
Ursula Braun35a6b172018-01-24 10:28:13 +01001327 if (rc < 0 || lsk->sk_state == SMC_CLOSED) {
Ursula Braunf61bca52019-04-11 11:17:34 +02001328 new_sk->sk_prot->unhash(new_sk);
Ursula Brauna046d572017-01-09 16:55:16 +01001329 if (new_clcsock)
1330 sock_release(new_clcsock);
1331 new_sk->sk_state = SMC_CLOSED;
1332 sock_set_flag(new_sk, SOCK_DEAD);
Ursula Braun51f1de72018-01-26 09:28:48 +01001333 sock_put(new_sk); /* final */
Ursula Braunac713872017-01-09 16:55:13 +01001334 *new_smc = NULL;
1335 goto out;
1336 }
1337
Ursula Brauna60a2b12020-09-10 18:48:20 +02001338 /* new clcsock has inherited the smc listen-specific sk_data_ready
1339 * function; switch it back to the original sk_data_ready function
1340 */
1341 new_clcsock->sk->sk_data_ready = lsmc->clcsk_data_ready;
Ursula Braunac713872017-01-09 16:55:13 +01001342 (*new_smc)->clcsock = new_clcsock;
1343out:
1344 return rc;
1345}
1346
Ursula Brauna046d572017-01-09 16:55:16 +01001347/* add a just created sock to the accept queue of the listen sock as
1348 * candidate for a following socket accept call from user space
1349 */
1350static void smc_accept_enqueue(struct sock *parent, struct sock *sk)
1351{
1352 struct smc_sock *par = smc_sk(parent);
1353
Ursula Braun51f1de72018-01-26 09:28:48 +01001354 sock_hold(sk); /* sock_put in smc_accept_unlink () */
Ursula Brauna046d572017-01-09 16:55:16 +01001355 spin_lock(&par->accept_q_lock);
1356 list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q);
1357 spin_unlock(&par->accept_q_lock);
1358 sk_acceptq_added(parent);
1359}
1360
1361/* remove a socket from the accept queue of its parental listening socket */
1362static void smc_accept_unlink(struct sock *sk)
1363{
1364 struct smc_sock *par = smc_sk(sk)->listen_smc;
1365
1366 spin_lock(&par->accept_q_lock);
1367 list_del_init(&smc_sk(sk)->accept_q);
1368 spin_unlock(&par->accept_q_lock);
1369 sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk);
Ursula Braun51f1de72018-01-26 09:28:48 +01001370 sock_put(sk); /* sock_hold in smc_accept_enqueue */
Ursula Brauna046d572017-01-09 16:55:16 +01001371}
1372
1373/* remove a sock from the accept queue to bind it to a new socket created
1374 * for a socket accept call from user space
1375 */
Ursula Braunb38d7322017-01-09 16:55:25 +01001376struct sock *smc_accept_dequeue(struct sock *parent,
1377 struct socket *new_sock)
Ursula Brauna046d572017-01-09 16:55:16 +01001378{
1379 struct smc_sock *isk, *n;
1380 struct sock *new_sk;
1381
1382 list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) {
1383 new_sk = (struct sock *)isk;
1384
1385 smc_accept_unlink(new_sk);
1386 if (new_sk->sk_state == SMC_CLOSED) {
Ursula Braunf61bca52019-04-11 11:17:34 +02001387 new_sk->sk_prot->unhash(new_sk);
Ursula Braun127f4972018-01-26 09:28:49 +01001388 if (isk->clcsock) {
1389 sock_release(isk->clcsock);
1390 isk->clcsock = NULL;
1391 }
Ursula Braun51f1de72018-01-26 09:28:48 +01001392 sock_put(new_sk); /* final */
Ursula Brauna046d572017-01-09 16:55:16 +01001393 continue;
1394 }
Ursula Braun07603b22019-04-11 11:17:32 +02001395 if (new_sock) {
Ursula Brauna046d572017-01-09 16:55:16 +01001396 sock_graft(new_sk, new_sock);
Ursula Braun07603b22019-04-11 11:17:32 +02001397 if (isk->use_fallback) {
1398 smc_sk(new_sk)->clcsock->file = new_sock->file;
1399 isk->clcsock->file->private_data = isk->clcsock;
1400 }
1401 }
Ursula Brauna046d572017-01-09 16:55:16 +01001402 return new_sk;
1403 }
1404 return NULL;
1405}
1406
1407/* clean up for a created but never accepted sock */
Ursula Braunb38d7322017-01-09 16:55:25 +01001408void smc_close_non_accepted(struct sock *sk)
Ursula Brauna046d572017-01-09 16:55:16 +01001409{
1410 struct smc_sock *smc = smc_sk(sk);
1411
Ursula Braun81cf4f42019-10-21 16:13:15 +02001412 sock_hold(sk); /* sock_put below */
Ursula Braunb38d7322017-01-09 16:55:25 +01001413 lock_sock(sk);
1414 if (!sk->sk_lingertime)
1415 /* wait for peer closing */
1416 sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT;
Ursula Braun39f41f32019-06-27 15:04:52 +02001417 __smc_release(smc);
Ursula Braunb38d7322017-01-09 16:55:25 +01001418 release_sock(sk);
Ursula Braun81cf4f42019-10-21 16:13:15 +02001419 sock_put(sk); /* sock_hold above */
Ursula Braun51f1de72018-01-26 09:28:48 +01001420 sock_put(sk); /* final sock_put */
Ursula Brauna046d572017-01-09 16:55:16 +01001421}
1422
Karsten Graulb9247542020-04-29 17:10:41 +02001423static int smcr_serv_conf_first_link(struct smc_sock *smc)
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001424{
Karsten Graul387707f2020-04-29 17:10:40 +02001425 struct smc_link *link = smc->conn.lnk;
Karsten Graul4667bb42020-04-30 15:55:42 +02001426 struct smc_llc_qentry *qentry;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001427 int rc;
1428
Karsten Graul7562a132020-05-01 12:48:01 +02001429 if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
Karsten Graul603cc142018-07-25 16:35:32 +02001430 return SMC_CLC_DECL_ERR_REGRMB;
Ursula Braun652a1e42017-07-28 13:56:17 +02001431
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001432 /* send CONFIRM LINK request to client over the RoCE fabric */
Ursula Braun947541f2018-07-25 16:35:30 +02001433 rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ);
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001434 if (rc < 0)
Karsten Graul603cc142018-07-25 16:35:32 +02001435 return SMC_CLC_DECL_TIMEOUT_CL;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001436
1437 /* receive CONFIRM LINK response from client over the RoCE fabric */
Karsten Graul4667bb42020-04-30 15:55:42 +02001438 qentry = smc_llc_wait(link->lgr, link, SMC_LLC_WAIT_TIME,
1439 SMC_LLC_CONFIRM_LINK);
1440 if (!qentry) {
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001441 struct smc_clc_msg_decline dclc;
1442
1443 rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
Ursula Braun2b59f582018-11-22 10:26:39 +01001444 SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
Ursula Braun9ed28552018-11-22 10:26:37 +01001445 return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001446 }
Karsten Graul649758f2020-05-04 14:18:48 +02001447 smc_llc_save_peer_uid(qentry);
Karsten Graul4667bb42020-04-30 15:55:42 +02001448 rc = smc_llc_eval_conf_link(qentry, SMC_LLC_RESP);
1449 smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
1450 if (rc)
Karsten Graul75d320d2018-03-01 13:51:31 +01001451 return SMC_CLC_DECL_RMBE_EC;
1452
Karsten Graul4667bb42020-04-30 15:55:42 +02001453 /* confirm_rkey is implicit on 1st contact */
1454 smc->conn.rmb_desc->is_conf_rkey = true;
Karsten Graul52bedf32018-03-01 13:51:32 +01001455
Karsten Graul00a049c2020-04-29 17:10:49 +02001456 smc_llc_link_active(link);
Karsten Graul0a99be42020-05-05 15:01:20 +02001457 smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
Karsten Graul52bedf32018-03-01 13:51:32 +01001458
Karsten Graul4667bb42020-04-30 15:55:42 +02001459 /* initial contact - try to establish second link */
Karsten Graulb4ba4652021-10-16 11:37:50 +02001460 smc_llc_srv_add_link(link, NULL);
Karsten Graul75d320d2018-03-01 13:51:31 +01001461 return 0;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01001462}
1463
Hans Wippel3b2dec22018-05-18 09:34:18 +02001464/* listen worker: finish */
1465static void smc_listen_out(struct smc_sock *new_smc)
Ursula Brauna046d572017-01-09 16:55:16 +01001466{
Ursula Brauna046d572017-01-09 16:55:16 +01001467 struct smc_sock *lsmc = new_smc->listen_smc;
Ursula Brauna046d572017-01-09 16:55:16 +01001468 struct sock *newsmcsk = &new_smc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01001469
Ursula Brauna046d572017-01-09 16:55:16 +01001470 if (lsmc->sk.sk_state == SMC_LISTEN) {
Karsten Graulfd577702019-04-11 11:17:30 +02001471 lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING);
Ursula Brauna046d572017-01-09 16:55:16 +01001472 smc_accept_enqueue(&lsmc->sk, newsmcsk);
Karsten Graulfd577702019-04-11 11:17:30 +02001473 release_sock(&lsmc->sk);
Ursula Brauna046d572017-01-09 16:55:16 +01001474 } else { /* no longer listening */
1475 smc_close_non_accepted(newsmcsk);
1476 }
Ursula Brauna046d572017-01-09 16:55:16 +01001477
1478 /* Wake up accept */
1479 lsmc->sk.sk_data_ready(&lsmc->sk);
1480 sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001481}
Ursula Brauna046d572017-01-09 16:55:16 +01001482
Hans Wippel3b2dec22018-05-18 09:34:18 +02001483/* listen worker: finish in state connected */
1484static void smc_listen_out_connected(struct smc_sock *new_smc)
1485{
1486 struct sock *newsmcsk = &new_smc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01001487
Hans Wippel3b2dec22018-05-18 09:34:18 +02001488 sk_refcnt_debug_inc(newsmcsk);
1489 if (newsmcsk->sk_state == SMC_INIT)
1490 newsmcsk->sk_state = SMC_ACTIVE;
1491
1492 smc_listen_out(new_smc);
1493}
1494
1495/* listen worker: finish in error state */
1496static void smc_listen_out_err(struct smc_sock *new_smc)
1497{
1498 struct sock *newsmcsk = &new_smc->sk;
Guvenc Gulce194730a2021-06-16 16:52:58 +02001499 struct net *net = sock_net(newsmcsk);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001500
Guvenc Gulce194730a2021-06-16 16:52:58 +02001501 this_cpu_inc(net->smc.smc_stats->srv_hshake_err_cnt);
Ursula Braun51f1de72018-01-26 09:28:48 +01001502 if (newsmcsk->sk_state == SMC_INIT)
1503 sock_put(&new_smc->sk); /* passive closing */
Ursula Brauna046d572017-01-09 16:55:16 +01001504 newsmcsk->sk_state = SMC_CLOSED;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001505
1506 smc_listen_out(new_smc);
1507}
1508
1509/* listen worker: decline and fall back if possible */
1510static void smc_listen_decline(struct smc_sock *new_smc, int reason_code,
Karsten Graul4a9baf42020-10-23 20:48:28 +02001511 int local_first, u8 version)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001512{
1513 /* RDMA setup failed, switch back to TCP */
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001514 smc_conn_abort(new_smc, local_first);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001515 if (reason_code < 0) { /* error, no fallback possible */
1516 smc_listen_out_err(new_smc);
1517 return;
1518 }
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02001519 smc_switch_to_fallback(new_smc, reason_code);
Karsten Graul603cc142018-07-25 16:35:32 +02001520 if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) {
Ursula Braune8d726c82020-09-26 12:44:32 +02001521 if (smc_clc_send_decline(new_smc, reason_code, version) < 0) {
Hans Wippel3b2dec22018-05-18 09:34:18 +02001522 smc_listen_out_err(new_smc);
1523 return;
1524 }
1525 }
1526 smc_listen_out_connected(new_smc);
1527}
1528
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001529/* listen worker: version checking */
1530static int smc_listen_v2_check(struct smc_sock *new_smc,
1531 struct smc_clc_msg_proposal *pclc,
1532 struct smc_init_info *ini)
1533{
1534 struct smc_clc_smcd_v2_extension *pclc_smcd_v2_ext;
1535 struct smc_clc_v2_extension *pclc_v2_ext;
Karsten Graul37524042020-10-31 19:19:38 +01001536 int rc = SMC_CLC_DECL_PEERNOSMC;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001537
1538 ini->smc_type_v1 = pclc->hdr.typev1;
1539 ini->smc_type_v2 = pclc->hdr.typev2;
Karsten Graule49300a2021-10-16 11:37:46 +02001540 ini->smcd_version = smcd_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1541 ini->smcr_version = smcr_indicated(ini->smc_type_v1) ? SMC_V1 : 0;
1542 if (pclc->hdr.version > SMC_V1) {
1543 if (smcd_indicated(ini->smc_type_v2))
1544 ini->smcd_version |= SMC_V2;
1545 if (smcr_indicated(ini->smc_type_v2))
1546 ini->smcr_version |= SMC_V2;
Karsten Graul37524042020-10-31 19:19:38 +01001547 }
Karsten Graule49300a2021-10-16 11:37:46 +02001548 if (!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) {
1549 rc = SMC_CLC_DECL_PEERNOSMC;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001550 goto out;
1551 }
1552 pclc_v2_ext = smc_get_clc_v2_ext(pclc);
1553 if (!pclc_v2_ext) {
1554 ini->smcd_version &= ~SMC_V2;
Karsten Graule49300a2021-10-16 11:37:46 +02001555 ini->smcr_version &= ~SMC_V2;
Karsten Graul37524042020-10-31 19:19:38 +01001556 rc = SMC_CLC_DECL_NOV2EXT;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001557 goto out;
1558 }
1559 pclc_smcd_v2_ext = smc_get_clc_smcd_v2_ext(pclc_v2_ext);
Karsten Graule49300a2021-10-16 11:37:46 +02001560 if (ini->smcd_version & SMC_V2) {
1561 if (!smc_ism_is_v2_capable()) {
1562 ini->smcd_version &= ~SMC_V2;
1563 rc = SMC_CLC_DECL_NOISM2SUPP;
1564 } else if (!pclc_smcd_v2_ext) {
1565 ini->smcd_version &= ~SMC_V2;
1566 rc = SMC_CLC_DECL_NOV2DEXT;
1567 } else if (!pclc_v2_ext->hdr.eid_cnt &&
1568 !pclc_v2_ext->hdr.flag.seid) {
1569 ini->smcd_version &= ~SMC_V2;
1570 rc = SMC_CLC_DECL_NOUEID;
1571 }
1572 }
1573 if (ini->smcr_version & SMC_V2) {
1574 if (!pclc_v2_ext->hdr.eid_cnt) {
1575 ini->smcr_version &= ~SMC_V2;
1576 rc = SMC_CLC_DECL_NOUEID;
1577 }
Karsten Graul37524042020-10-31 19:19:38 +01001578 }
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001579
1580out:
Karsten Graule49300a2021-10-16 11:37:46 +02001581 if (!ini->smcd_version && !ini->smcr_version)
Karsten Graul37524042020-10-31 19:19:38 +01001582 return rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001583
1584 return 0;
1585}
1586
Hans Wippel3b2dec22018-05-18 09:34:18 +02001587/* listen worker: check prefixes */
Karsten Graul59886692019-04-12 12:57:25 +02001588static int smc_listen_prfx_check(struct smc_sock *new_smc,
Hans Wippel3b2dec22018-05-18 09:34:18 +02001589 struct smc_clc_msg_proposal *pclc)
1590{
1591 struct smc_clc_msg_proposal_prefix *pclc_prfx;
1592 struct socket *newclcsock = new_smc->clcsock;
1593
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001594 if (pclc->hdr.typev1 == SMC_TYPE_N)
1595 return 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001596 pclc_prfx = smc_clc_proposal_get_prefix(pclc);
1597 if (smc_clc_prfx_match(newclcsock, pclc_prfx))
Karsten Graul59886692019-04-12 12:57:25 +02001598 return SMC_CLC_DECL_DIFFPREFIX;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001599
1600 return 0;
1601}
1602
1603/* listen worker: initialize connection and buffers */
1604static int smc_listen_rdma_init(struct smc_sock *new_smc,
Karsten Graul7a62725a2019-04-12 12:57:30 +02001605 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001606{
Karsten Graul7a62725a2019-04-12 12:57:30 +02001607 int rc;
1608
Hans Wippel3b2dec22018-05-18 09:34:18 +02001609 /* allocate connection / link group */
Karsten Graul7a62725a2019-04-12 12:57:30 +02001610 rc = smc_conn_create(new_smc, ini);
1611 if (rc)
1612 return rc;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001613
1614 /* create send buffer and rmb */
Hans Wippelc6ba7c92018-06-28 19:05:07 +02001615 if (smc_buf_create(new_smc, false))
Hans Wippel3b2dec22018-05-18 09:34:18 +02001616 return SMC_CLC_DECL_MEM;
1617
1618 return 0;
1619}
1620
Hans Wippel41349842018-06-28 19:05:11 +02001621/* listen worker: initialize connection and buffers for SMC-D */
1622static int smc_listen_ism_init(struct smc_sock *new_smc,
Karsten Graul7a62725a2019-04-12 12:57:30 +02001623 struct smc_init_info *ini)
Hans Wippel41349842018-06-28 19:05:11 +02001624{
Karsten Graul7a62725a2019-04-12 12:57:30 +02001625 int rc;
Hans Wippel41349842018-06-28 19:05:11 +02001626
Karsten Graul7a62725a2019-04-12 12:57:30 +02001627 rc = smc_conn_create(new_smc, ini);
1628 if (rc)
1629 return rc;
Hans Wippel41349842018-06-28 19:05:11 +02001630
Hans Wippel41349842018-06-28 19:05:11 +02001631 /* Create send and receive buffers */
Karsten Graul72b7f6c2020-07-26 20:34:28 +02001632 rc = smc_buf_create(new_smc, true);
1633 if (rc) {
Karsten Graul8cf3f3e2020-12-01 20:20:36 +01001634 smc_conn_abort(new_smc, ini->first_contact_local);
Karsten Graul72b7f6c2020-07-26 20:34:28 +02001635 return (rc == -ENOSPC) ? SMC_CLC_DECL_MAX_DMB :
1636 SMC_CLC_DECL_MEM;
Hans Wippel41349842018-06-28 19:05:11 +02001637 }
1638
1639 return 0;
1640}
1641
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001642static bool smc_is_already_selected(struct smcd_dev *smcd,
1643 struct smc_init_info *ini,
1644 int matches)
1645{
1646 int i;
1647
1648 for (i = 0; i < matches; i++)
1649 if (smcd == ini->ism_dev[i])
1650 return true;
1651
1652 return false;
1653}
1654
1655/* check for ISM devices matching proposed ISM devices */
1656static void smc_check_ism_v2_match(struct smc_init_info *ini,
1657 u16 proposed_chid, u64 proposed_gid,
1658 unsigned int *matches)
1659{
1660 struct smcd_dev *smcd;
1661
1662 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1663 if (smcd->going_away)
1664 continue;
1665 if (smc_is_already_selected(smcd, ini, *matches))
1666 continue;
1667 if (smc_ism_get_chid(smcd) == proposed_chid &&
1668 !smc_ism_cantalk(proposed_gid, ISM_RESERVED_VLANID, smcd)) {
1669 ini->ism_peer_gid[*matches] = proposed_gid;
1670 ini->ism_dev[*matches] = smcd;
1671 (*matches)++;
1672 break;
1673 }
1674 }
1675}
1676
Karsten Graul37524042020-10-31 19:19:38 +01001677static void smc_find_ism_store_rc(u32 rc, struct smc_init_info *ini)
1678{
1679 if (!ini->rc)
1680 ini->rc = rc;
1681}
1682
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001683static void smc_find_ism_v2_device_serv(struct smc_sock *new_smc,
1684 struct smc_clc_msg_proposal *pclc,
1685 struct smc_init_info *ini)
1686{
1687 struct smc_clc_smcd_v2_extension *smcd_v2_ext;
1688 struct smc_clc_v2_extension *smc_v2_ext;
1689 struct smc_clc_msg_smcd *pclc_smcd;
1690 unsigned int matches = 0;
Karsten Graulf29fa002020-10-07 22:57:43 +02001691 u8 smcd_version;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001692 u8 *eid = NULL;
Karsten Graul37524042020-10-31 19:19:38 +01001693 int i, rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001694
1695 if (!(ini->smcd_version & SMC_V2) || !smcd_indicated(ini->smc_type_v2))
Karsten Graulf29fa002020-10-07 22:57:43 +02001696 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001697
1698 pclc_smcd = smc_get_clc_msg_smcd(pclc);
1699 smc_v2_ext = smc_get_clc_v2_ext(pclc);
1700 smcd_v2_ext = smc_get_clc_smcd_v2_ext(smc_v2_ext);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001701
1702 mutex_lock(&smcd_dev_list.mutex);
1703 if (pclc_smcd->ism.chid)
1704 /* check for ISM device matching proposed native ISM device */
1705 smc_check_ism_v2_match(ini, ntohs(pclc_smcd->ism.chid),
1706 ntohll(pclc_smcd->ism.gid), &matches);
1707 for (i = 1; i <= smc_v2_ext->hdr.ism_gid_cnt; i++) {
1708 /* check for ISM devices matching proposed non-native ISM
1709 * devices
1710 */
1711 smc_check_ism_v2_match(ini,
1712 ntohs(smcd_v2_ext->gidchid[i - 1].chid),
1713 ntohll(smcd_v2_ext->gidchid[i - 1].gid),
1714 &matches);
1715 }
1716 mutex_unlock(&smcd_dev_list.mutex);
1717
Karsten Graule49300a2021-10-16 11:37:46 +02001718 if (!ini->ism_dev[0]) {
1719 smc_find_ism_store_rc(SMC_CLC_DECL_NOSMCD2DEV, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001720 goto not_found;
Karsten Graule49300a2021-10-16 11:37:46 +02001721 }
Karsten Graulfa086662021-09-14 10:35:05 +02001722
Karsten Graul11a26c52021-09-14 10:35:06 +02001723 smc_ism_get_system_eid(&eid);
Karsten Graulfa086662021-09-14 10:35:05 +02001724 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext,
1725 smcd_v2_ext->system_eid, eid))
1726 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001727
1728 /* separate - outside the smcd_dev_list.lock */
Karsten Graulf29fa002020-10-07 22:57:43 +02001729 smcd_version = ini->smcd_version;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001730 for (i = 0; i < matches; i++) {
1731 ini->smcd_version = SMC_V2;
1732 ini->is_smcd = true;
1733 ini->ism_selected = i;
Karsten Graul37524042020-10-31 19:19:38 +01001734 rc = smc_listen_ism_init(new_smc, ini);
1735 if (rc) {
1736 smc_find_ism_store_rc(rc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001737 /* try next active ISM device */
1738 continue;
Karsten Graul37524042020-10-31 19:19:38 +01001739 }
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001740 return; /* matching and usable V2 ISM device found */
1741 }
Karsten Graulf29fa002020-10-07 22:57:43 +02001742 /* no V2 ISM device could be initialized */
1743 ini->smcd_version = smcd_version; /* restore original value */
Karsten Graulfa086662021-09-14 10:35:05 +02001744 ini->negotiated_eid[0] = 0;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001745
1746not_found:
1747 ini->smcd_version &= ~SMC_V2;
1748 ini->ism_dev[0] = NULL;
1749 ini->is_smcd = false;
1750}
1751
1752static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
1753 struct smc_clc_msg_proposal *pclc,
1754 struct smc_init_info *ini)
Ursula Braun7affc802020-09-26 12:44:21 +02001755{
1756 struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
Karsten Graul37524042020-10-31 19:19:38 +01001757 int rc = 0;
Ursula Braun7affc802020-09-26 12:44:21 +02001758
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001759 /* check if ISM V1 is available */
1760 if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
Ursula Braun7affc802020-09-26 12:44:21 +02001761 goto not_found;
1762 ini->is_smcd = true; /* prepare ISM check */
Ursula Braun8c3dca32020-09-26 12:44:28 +02001763 ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
Karsten Graul37524042020-10-31 19:19:38 +01001764 rc = smc_find_ism_device(new_smc, ini);
1765 if (rc)
Ursula Braun7affc802020-09-26 12:44:21 +02001766 goto not_found;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001767 ini->ism_selected = 0;
Karsten Graul37524042020-10-31 19:19:38 +01001768 rc = smc_listen_ism_init(new_smc, ini);
1769 if (!rc)
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001770 return; /* V1 ISM device found */
Ursula Braun7affc802020-09-26 12:44:21 +02001771
1772not_found:
Karsten Graul37524042020-10-31 19:19:38 +01001773 smc_find_ism_store_rc(rc, ini);
Karsten Graule49300a2021-10-16 11:37:46 +02001774 ini->smcd_version &= ~SMC_V1;
Ursula Braun3fc64932020-09-26 12:44:23 +02001775 ini->ism_dev[0] = NULL;
Ursula Braun7affc802020-09-26 12:44:21 +02001776 ini->is_smcd = false;
1777}
1778
Hans Wippel3b2dec22018-05-18 09:34:18 +02001779/* listen worker: register buffers */
Ursula Braun5ac54d82020-09-10 18:48:21 +02001780static int smc_listen_rdma_reg(struct smc_sock *new_smc, bool local_first)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001781{
Karsten Graulb9247542020-04-29 17:10:41 +02001782 struct smc_connection *conn = &new_smc->conn;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001783
Ursula Braun5ac54d82020-09-10 18:48:21 +02001784 if (!local_first) {
Karsten Graul7562a132020-05-01 12:48:01 +02001785 if (smcr_lgr_reg_rmbs(conn->lnk, conn->rmb_desc))
Karsten Graulc7674c02018-11-22 10:26:43 +01001786 return SMC_CLC_DECL_ERR_REGRMB;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001787 }
1788 smc_rmb_sync_sg_for_device(&new_smc->conn);
1789
1790 return 0;
1791}
1792
Karsten Graule49300a2021-10-16 11:37:46 +02001793static void smc_find_rdma_v2_device_serv(struct smc_sock *new_smc,
1794 struct smc_clc_msg_proposal *pclc,
1795 struct smc_init_info *ini)
1796{
1797 struct smc_clc_v2_extension *smc_v2_ext;
1798 u8 smcr_version;
1799 int rc;
1800
1801 if (!(ini->smcr_version & SMC_V2) || !smcr_indicated(ini->smc_type_v2))
1802 goto not_found;
1803
1804 smc_v2_ext = smc_get_clc_v2_ext(pclc);
1805 if (!smc_clc_match_eid(ini->negotiated_eid, smc_v2_ext, NULL, NULL))
1806 goto not_found;
1807
1808 /* prepare RDMA check */
1809 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
1810 memcpy(ini->peer_gid, smc_v2_ext->roce, SMC_GID_SIZE);
1811 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
1812 ini->check_smcrv2 = true;
1813 ini->smcrv2.clc_sk = new_smc->clcsock->sk;
1814 ini->smcrv2.saddr = new_smc->clcsock->sk->sk_rcv_saddr;
1815 ini->smcrv2.daddr = smc_ib_gid_to_ipv4(smc_v2_ext->roce);
1816 rc = smc_find_rdma_device(new_smc, ini);
1817 if (rc) {
1818 smc_find_ism_store_rc(rc, ini);
1819 goto not_found;
1820 }
1821 if (!ini->smcrv2.uses_gateway)
1822 memcpy(ini->smcrv2.nexthop_mac, pclc->lcl.mac, ETH_ALEN);
1823
1824 smcr_version = ini->smcr_version;
1825 ini->smcr_version = SMC_V2;
1826 rc = smc_listen_rdma_init(new_smc, ini);
1827 if (!rc)
1828 rc = smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1829 if (!rc)
1830 return;
1831 ini->smcr_version = smcr_version;
1832 smc_find_ism_store_rc(rc, ini);
1833
1834not_found:
1835 ini->smcr_version &= ~SMC_V2;
1836 ini->check_smcrv2 = false;
1837}
1838
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001839static int smc_find_rdma_v1_device_serv(struct smc_sock *new_smc,
1840 struct smc_clc_msg_proposal *pclc,
1841 struct smc_init_info *ini)
Ursula Braun7affc802020-09-26 12:44:21 +02001842{
1843 int rc;
1844
Karsten Graule49300a2021-10-16 11:37:46 +02001845 if (!(ini->smcr_version & SMC_V1) || !smcr_indicated(ini->smc_type_v1))
Ursula Braun7affc802020-09-26 12:44:21 +02001846 return SMC_CLC_DECL_NOSMCDEV;
1847
1848 /* prepare RDMA check */
Karsten Graule49300a2021-10-16 11:37:46 +02001849 memcpy(ini->peer_systemid, pclc->lcl.id_for_peer, SMC_SYSTEMID_LEN);
1850 memcpy(ini->peer_gid, pclc->lcl.gid, SMC_GID_SIZE);
1851 memcpy(ini->peer_mac, pclc->lcl.mac, ETH_ALEN);
Ursula Braun7affc802020-09-26 12:44:21 +02001852 rc = smc_find_rdma_device(new_smc, ini);
1853 if (rc) {
1854 /* no RDMA device found */
Karsten Graule49300a2021-10-16 11:37:46 +02001855 return SMC_CLC_DECL_NOSMCDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02001856 }
1857 rc = smc_listen_rdma_init(new_smc, ini);
1858 if (rc)
1859 return rc;
1860 return smc_listen_rdma_reg(new_smc, ini->first_contact_local);
1861}
1862
1863/* determine the local device matching to proposal */
1864static int smc_listen_find_device(struct smc_sock *new_smc,
1865 struct smc_clc_msg_proposal *pclc,
1866 struct smc_init_info *ini)
1867{
Karsten Graule49300a2021-10-16 11:37:46 +02001868 int prfx_rc;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001869
1870 /* check for ISM device matching V2 proposed device */
1871 smc_find_ism_v2_device_serv(new_smc, pclc, ini);
1872 if (ini->ism_dev[0])
Ursula Braun7affc802020-09-26 12:44:21 +02001873 return 0;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001874
Karsten Graule49300a2021-10-16 11:37:46 +02001875 /* check for matching IP prefix and subnet length (V1) */
1876 prfx_rc = smc_listen_prfx_check(new_smc, pclc);
1877 if (prfx_rc)
1878 smc_find_ism_store_rc(prfx_rc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001879
1880 /* get vlan id from IP device */
1881 if (smc_vlan_by_tcpsk(new_smc->clcsock, ini))
Karsten Graul37524042020-10-31 19:19:38 +01001882 return ini->rc ?: SMC_CLC_DECL_GETVLANERR;
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001883
1884 /* check for ISM device matching V1 proposed device */
Karsten Graule49300a2021-10-16 11:37:46 +02001885 if (!prfx_rc)
1886 smc_find_ism_v1_device_serv(new_smc, pclc, ini);
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001887 if (ini->ism_dev[0])
1888 return 0;
1889
Karsten Graule49300a2021-10-16 11:37:46 +02001890 if (!smcr_indicated(pclc->hdr.typev1) &&
1891 !smcr_indicated(pclc->hdr.typev2))
Karsten Graul37524042020-10-31 19:19:38 +01001892 /* skip RDMA and decline */
1893 return ini->rc ?: SMC_CLC_DECL_NOSMCDDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02001894
Karsten Graule49300a2021-10-16 11:37:46 +02001895 /* check if RDMA V2 is available */
1896 smc_find_rdma_v2_device_serv(new_smc, pclc, ini);
1897 if (ini->smcrv2.ib_dev_v2)
1898 return 0;
Karsten Graul37524042020-10-31 19:19:38 +01001899
Karsten Graule49300a2021-10-16 11:37:46 +02001900 /* check if RDMA V1 is available */
1901 if (!prfx_rc) {
1902 int rc;
1903
1904 rc = smc_find_rdma_v1_device_serv(new_smc, pclc, ini);
1905 smc_find_ism_store_rc(rc, ini);
1906 return (!rc) ? 0 : ini->rc;
1907 }
1908 return SMC_CLC_DECL_NOSMCDEV;
Ursula Braun7affc802020-09-26 12:44:21 +02001909}
1910
Hans Wippel3b2dec22018-05-18 09:34:18 +02001911/* listen worker: finish RDMA setup */
Ursula Braun1ca52fc2018-09-18 15:46:35 +02001912static int smc_listen_rdma_finish(struct smc_sock *new_smc,
1913 struct smc_clc_msg_accept_confirm *cclc,
Karsten Graule49300a2021-10-16 11:37:46 +02001914 bool local_first,
1915 struct smc_init_info *ini)
Hans Wippel3b2dec22018-05-18 09:34:18 +02001916{
Karsten Graul387707f2020-04-29 17:10:40 +02001917 struct smc_link *link = new_smc->conn.lnk;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001918 int reason_code = 0;
1919
Ursula Braun5ac54d82020-09-10 18:48:21 +02001920 if (local_first)
Karsten Graule49300a2021-10-16 11:37:46 +02001921 smc_link_save_peer_info(link, cclc, ini);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001922
Ursula Braun0c881ad2020-09-10 18:48:25 +02001923 if (smc_rmb_rtoken_handling(&new_smc->conn, link, cclc))
1924 return SMC_CLC_DECL_ERR_RTOK;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001925
Ursula Braun5ac54d82020-09-10 18:48:21 +02001926 if (local_first) {
Ursula Braun0c881ad2020-09-10 18:48:25 +02001927 if (smc_ib_ready_link(link))
1928 return SMC_CLC_DECL_ERR_RDYLNK;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001929 /* QP confirmation over RoCE fabric */
Karsten Graul4667bb42020-04-30 15:55:42 +02001930 smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
Karsten Graulb9247542020-04-29 17:10:41 +02001931 reason_code = smcr_serv_conf_first_link(new_smc);
Karsten Graul4667bb42020-04-30 15:55:42 +02001932 smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001933 }
Ursula Braun1ca52fc2018-09-18 15:46:35 +02001934 return reason_code;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001935}
1936
Ursula Braun7affc802020-09-26 12:44:21 +02001937/* setup for connection of server */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001938static void smc_listen_work(struct work_struct *work)
1939{
1940 struct smc_sock *new_smc = container_of(work, struct smc_sock,
1941 smc_listen_work);
1942 struct socket *newclcsock = new_smc->clcsock;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02001943 struct smc_clc_msg_accept_confirm *cclc;
Ursula Braun6bb14e482020-09-10 18:48:22 +02001944 struct smc_clc_msg_proposal_area *buf;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001945 struct smc_clc_msg_proposal *pclc;
Ursula Braun3fc64932020-09-26 12:44:23 +02001946 struct smc_init_info *ini = NULL;
Karsten Graule49300a2021-10-16 11:37:46 +02001947 u8 proposal_version = SMC_V1;
1948 u8 accept_version;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001949 int rc = 0;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001950
Karsten Graulfd577702019-04-11 11:17:30 +02001951 if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
1952 return smc_listen_out_err(new_smc);
1953
Hans Wippel3b2dec22018-05-18 09:34:18 +02001954 if (new_smc->use_fallback) {
1955 smc_listen_out_connected(new_smc);
1956 return;
1957 }
1958
1959 /* check if peer is smc capable */
1960 if (!tcp_sk(newclcsock->sk)->syn_smc) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02001961 smc_switch_to_fallback(new_smc, SMC_CLC_DECL_PEERNOSMC);
Hans Wippel3b2dec22018-05-18 09:34:18 +02001962 smc_listen_out_connected(new_smc);
1963 return;
1964 }
1965
1966 /* do inband token exchange -
1967 * wait for and receive SMC Proposal CLC message
1968 */
Ursula Braun6bb14e482020-09-10 18:48:22 +02001969 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1970 if (!buf) {
1971 rc = SMC_CLC_DECL_MEM;
1972 goto out_decl;
1973 }
1974 pclc = (struct smc_clc_msg_proposal *)buf;
1975 rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
Karsten Graul228bae02019-04-12 12:57:28 +02001976 SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
Karsten Graul9aa68d22019-04-12 12:57:29 +02001977 if (rc)
1978 goto out_decl;
Karsten Graule49300a2021-10-16 11:37:46 +02001979
1980 if (pclc->hdr.version > SMC_V1)
1981 proposal_version = SMC_V2;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001982
Ursula Braune8d726c82020-09-26 12:44:32 +02001983 /* IPSec connections opt out of SMC optimizations */
Hans Wippel3b2dec22018-05-18 09:34:18 +02001984 if (using_ipsec(new_smc)) {
Karsten Graul9aa68d22019-04-12 12:57:29 +02001985 rc = SMC_CLC_DECL_IPSEC;
1986 goto out_decl;
Hans Wippel3b2dec22018-05-18 09:34:18 +02001987 }
1988
Ursula Braun3fc64932020-09-26 12:44:23 +02001989 ini = kzalloc(sizeof(*ini), GFP_KERNEL);
1990 if (!ini) {
1991 rc = SMC_CLC_DECL_MEM;
1992 goto out_decl;
1993 }
1994
Ursula Braun5c21c4c2020-09-26 12:44:29 +02001995 /* initial version checking */
1996 rc = smc_listen_v2_check(new_smc, pclc, ini);
1997 if (rc)
Karsten Graul9aa68d22019-04-12 12:57:29 +02001998 goto out_decl;
Karsten Graulfba7e8e2019-04-12 12:57:27 +02001999
Hans Wippel72a36a82019-02-07 15:56:18 +01002000 mutex_lock(&smc_server_lgr_pending);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002001 smc_close_init(new_smc);
2002 smc_rx_init(new_smc);
2003 smc_tx_init(new_smc);
2004
Ursula Braun7affc802020-09-26 12:44:21 +02002005 /* determine ISM or RoCE device used for connection */
Ursula Braun3fc64932020-09-26 12:44:23 +02002006 rc = smc_listen_find_device(new_smc, pclc, ini);
Ursula Braun7affc802020-09-26 12:44:21 +02002007 if (rc)
2008 goto out_unlock;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002009
2010 /* send SMC Accept CLC message */
Karsten Graule49300a2021-10-16 11:37:46 +02002011 accept_version = ini->is_smcd ? ini->smcd_version : ini->smcr_version;
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002012 rc = smc_clc_send_accept(new_smc, ini->first_contact_local,
Karsten Graule49300a2021-10-16 11:37:46 +02002013 accept_version, ini->negotiated_eid);
Karsten Graul9aa68d22019-04-12 12:57:29 +02002014 if (rc)
2015 goto out_unlock;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002016
Hans Wippel62c71392019-02-07 15:56:17 +01002017 /* SMC-D does not need this lock any more */
Ursula Braun3fc64932020-09-26 12:44:23 +02002018 if (ini->is_smcd)
Hans Wippel72a36a82019-02-07 15:56:18 +01002019 mutex_unlock(&smc_server_lgr_pending);
Hans Wippel62c71392019-02-07 15:56:17 +01002020
Hans Wippel3b2dec22018-05-18 09:34:18 +02002021 /* receive SMC Confirm CLC message */
Karsten Graul9047a617dc2020-10-07 22:57:42 +02002022 memset(buf, 0, sizeof(*buf));
2023 cclc = (struct smc_clc_msg_accept_confirm *)buf;
2024 rc = smc_clc_wait_msg(new_smc, cclc, sizeof(*buf),
Karsten Graul228bae02019-04-12 12:57:28 +02002025 SMC_CLC_CONFIRM, CLC_WAIT_TIME);
2026 if (rc) {
Ursula Braun3fc64932020-09-26 12:44:23 +02002027 if (!ini->is_smcd)
Karsten Graul9aa68d22019-04-12 12:57:29 +02002028 goto out_unlock;
2029 goto out_decl;
Hans Wippel3b2dec22018-05-18 09:34:18 +02002030 }
2031
2032 /* finish worker */
Ursula Braun3fc64932020-09-26 12:44:23 +02002033 if (!ini->is_smcd) {
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002034 rc = smc_listen_rdma_finish(new_smc, cclc,
Karsten Graule49300a2021-10-16 11:37:46 +02002035 ini->first_contact_local, ini);
Hans Wippel62c71392019-02-07 15:56:17 +01002036 if (rc)
Ursula Braun0c881ad2020-09-10 18:48:25 +02002037 goto out_unlock;
2038 mutex_unlock(&smc_server_lgr_pending);
Ursula Braun1ca52fc2018-09-18 15:46:35 +02002039 }
Ursula Brauna7c9c5f2020-09-26 12:44:30 +02002040 smc_conn_save_peer_info(new_smc, cclc);
Hans Wippel3b2dec22018-05-18 09:34:18 +02002041 smc_listen_out_connected(new_smc);
Guvenc Gulce194730a2021-06-16 16:52:58 +02002042 SMC_STAT_SERV_SUCC_INC(sock_net(newclcsock->sk), ini);
Ursula Braunac679362020-09-17 22:46:02 +02002043 goto out_free;
Karsten Graul9aa68d22019-04-12 12:57:29 +02002044
2045out_unlock:
2046 mutex_unlock(&smc_server_lgr_pending);
2047out_decl:
Karsten Graul4a9baf42020-10-23 20:48:28 +02002048 smc_listen_decline(new_smc, rc, ini ? ini->first_contact_local : 0,
Karsten Graule49300a2021-10-16 11:37:46 +02002049 proposal_version);
Ursula Braunac679362020-09-17 22:46:02 +02002050out_free:
Ursula Braun3fc64932020-09-26 12:44:23 +02002051 kfree(ini);
Ursula Braun6bb14e482020-09-10 18:48:22 +02002052 kfree(buf);
Ursula Brauna046d572017-01-09 16:55:16 +01002053}
2054
2055static void smc_tcp_listen_work(struct work_struct *work)
2056{
2057 struct smc_sock *lsmc = container_of(work, struct smc_sock,
2058 tcp_listen_work);
Ursula Braun3163c502018-01-24 10:28:12 +01002059 struct sock *lsk = &lsmc->sk;
Ursula Brauna046d572017-01-09 16:55:16 +01002060 struct smc_sock *new_smc;
2061 int rc = 0;
2062
Ursula Braun3163c502018-01-24 10:28:12 +01002063 lock_sock(lsk);
2064 while (lsk->sk_state == SMC_LISTEN) {
Ursula Brauna046d572017-01-09 16:55:16 +01002065 rc = smc_clcsock_accept(lsmc, &new_smc);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002066 if (rc) /* clcsock accept queue empty or error */
Ursula Brauna046d572017-01-09 16:55:16 +01002067 goto out;
2068 if (!new_smc)
2069 continue;
2070
2071 new_smc->listen_smc = lsmc;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002072 new_smc->use_fallback = lsmc->use_fallback;
Karsten Graul603cc142018-07-25 16:35:32 +02002073 new_smc->fallback_rsn = lsmc->fallback_rsn;
Ursula Braun3163c502018-01-24 10:28:12 +01002074 sock_hold(lsk); /* sock_put in smc_listen_work */
Ursula Brauna046d572017-01-09 16:55:16 +01002075 INIT_WORK(&new_smc->smc_listen_work, smc_listen_work);
2076 smc_copy_sock_settings_to_smc(new_smc);
Ursula Braunbd58c7e2018-08-08 14:13:20 +02002077 new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf;
2078 new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf;
Ursula Braun51f1de72018-01-26 09:28:48 +01002079 sock_hold(&new_smc->sk); /* sock_put in passive closing */
Karsten Graul22ef4732020-09-10 18:48:29 +02002080 if (!queue_work(smc_hs_wq, &new_smc->smc_listen_work))
Ursula Braun51f1de72018-01-26 09:28:48 +01002081 sock_put(&new_smc->sk);
Ursula Brauna046d572017-01-09 16:55:16 +01002082 }
2083
2084out:
Ursula Braun3163c502018-01-24 10:28:12 +01002085 release_sock(lsk);
Ursula Brauna60a2b12020-09-10 18:48:20 +02002086 sock_put(&lsmc->sk); /* sock_hold in smc_clcsock_data_ready() */
2087}
2088
2089static void smc_clcsock_data_ready(struct sock *listen_clcsock)
2090{
2091 struct smc_sock *lsmc;
2092
2093 lsmc = (struct smc_sock *)
2094 ((uintptr_t)listen_clcsock->sk_user_data & ~SK_USER_DATA_NOCOPY);
2095 if (!lsmc)
2096 return;
2097 lsmc->clcsk_data_ready(listen_clcsock);
2098 if (lsmc->sk.sk_state == SMC_LISTEN) {
2099 sock_hold(&lsmc->sk); /* sock_put in smc_tcp_listen_work() */
Karsten Graul22ef4732020-09-10 18:48:29 +02002100 if (!queue_work(smc_hs_wq, &lsmc->tcp_listen_work))
Ursula Brauna60a2b12020-09-10 18:48:20 +02002101 sock_put(&lsmc->sk);
2102 }
Ursula Brauna046d572017-01-09 16:55:16 +01002103}
2104
Ursula Braunac713872017-01-09 16:55:13 +01002105static int smc_listen(struct socket *sock, int backlog)
2106{
2107 struct sock *sk = sock->sk;
2108 struct smc_sock *smc;
2109 int rc;
2110
2111 smc = smc_sk(sk);
2112 lock_sock(sk);
2113
2114 rc = -EINVAL;
Ursula Brauncd206362019-08-02 10:47:50 +02002115 if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) ||
2116 smc->connect_nonblock)
Ursula Braunac713872017-01-09 16:55:13 +01002117 goto out;
2118
2119 rc = 0;
2120 if (sk->sk_state == SMC_LISTEN) {
2121 sk->sk_max_ack_backlog = backlog;
2122 goto out;
2123 }
2124 /* some socket options are handled in core, so we could not apply
2125 * them to the clc socket -- copy smc socket options to clc socket
2126 */
2127 smc_copy_sock_settings_to_clc(smc);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002128 if (!smc->use_fallback)
2129 tcp_sk(smc->clcsock->sk)->syn_smc = 1;
Ursula Braunac713872017-01-09 16:55:13 +01002130
Ursula Brauna60a2b12020-09-10 18:48:20 +02002131 /* save original sk_data_ready function and establish
2132 * smc-specific sk_data_ready function
2133 */
2134 smc->clcsk_data_ready = smc->clcsock->sk->sk_data_ready;
2135 smc->clcsock->sk->sk_data_ready = smc_clcsock_data_ready;
2136 smc->clcsock->sk->sk_user_data =
2137 (void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
Ursula Braunac713872017-01-09 16:55:13 +01002138 rc = kernel_listen(smc->clcsock, backlog);
Guo DaXing9ebb0c42021-11-24 13:32:38 +01002139 if (rc) {
2140 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
Ursula Braunac713872017-01-09 16:55:13 +01002141 goto out;
Guo DaXing9ebb0c42021-11-24 13:32:38 +01002142 }
Ursula Braunac713872017-01-09 16:55:13 +01002143 sk->sk_max_ack_backlog = backlog;
2144 sk->sk_ack_backlog = 0;
2145 sk->sk_state = SMC_LISTEN;
2146
2147out:
2148 release_sock(sk);
2149 return rc;
2150}
2151
2152static int smc_accept(struct socket *sock, struct socket *new_sock,
David Howellscdfbabf2017-03-09 08:09:05 +00002153 int flags, bool kern)
Ursula Braunac713872017-01-09 16:55:13 +01002154{
Ursula Brauna046d572017-01-09 16:55:16 +01002155 struct sock *sk = sock->sk, *nsk;
2156 DECLARE_WAITQUEUE(wait, current);
Ursula Braunac713872017-01-09 16:55:13 +01002157 struct smc_sock *lsmc;
Ursula Brauna046d572017-01-09 16:55:16 +01002158 long timeo;
2159 int rc = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002160
2161 lsmc = smc_sk(sk);
Ursula Braun51f1de72018-01-26 09:28:48 +01002162 sock_hold(sk); /* sock_put below */
Ursula Braunac713872017-01-09 16:55:13 +01002163 lock_sock(sk);
2164
2165 if (lsmc->sk.sk_state != SMC_LISTEN) {
2166 rc = -EINVAL;
Ursula Braunabb190f2018-04-26 17:18:23 +02002167 release_sock(sk);
Ursula Braunac713872017-01-09 16:55:13 +01002168 goto out;
2169 }
2170
Ursula Brauna046d572017-01-09 16:55:16 +01002171 /* Wait for an incoming connection */
2172 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2173 add_wait_queue_exclusive(sk_sleep(sk), &wait);
2174 while (!(nsk = smc_accept_dequeue(sk, new_sock))) {
2175 set_current_state(TASK_INTERRUPTIBLE);
2176 if (!timeo) {
2177 rc = -EAGAIN;
2178 break;
2179 }
2180 release_sock(sk);
2181 timeo = schedule_timeout(timeo);
2182 /* wakeup by sk_data_ready in smc_listen_work() */
2183 sched_annotate_sleep();
2184 lock_sock(sk);
2185 if (signal_pending(current)) {
2186 rc = sock_intr_errno(timeo);
2187 break;
2188 }
2189 }
2190 set_current_state(TASK_RUNNING);
2191 remove_wait_queue(sk_sleep(sk), &wait);
Ursula Braunac713872017-01-09 16:55:13 +01002192
Ursula Brauna046d572017-01-09 16:55:16 +01002193 if (!rc)
2194 rc = sock_error(nsk);
Ursula Braunabb190f2018-04-26 17:18:23 +02002195 release_sock(sk);
2196 if (rc)
2197 goto out;
2198
2199 if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) {
2200 /* wait till data arrives on the socket */
2201 timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept *
2202 MSEC_PER_SEC);
2203 if (smc_sk(nsk)->use_fallback) {
2204 struct sock *clcsk = smc_sk(nsk)->clcsock->sk;
2205
2206 lock_sock(clcsk);
2207 if (skb_queue_empty(&clcsk->sk_receive_queue))
2208 sk_wait_data(clcsk, &timeo, NULL);
2209 release_sock(clcsk);
2210 } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) {
2211 lock_sock(nsk);
Stefan Rasplb51fa1b2018-05-03 18:12:37 +02002212 smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available);
Ursula Braunabb190f2018-04-26 17:18:23 +02002213 release_sock(nsk);
2214 }
2215 }
Ursula Braunac713872017-01-09 16:55:13 +01002216
2217out:
Ursula Braun51f1de72018-01-26 09:28:48 +01002218 sock_put(sk); /* sock_hold above */
Ursula Braunac713872017-01-09 16:55:13 +01002219 return rc;
2220}
2221
2222static int smc_getname(struct socket *sock, struct sockaddr *addr,
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01002223 int peer)
Ursula Braunac713872017-01-09 16:55:13 +01002224{
2225 struct smc_sock *smc;
2226
Ursula Braunb38d7322017-01-09 16:55:25 +01002227 if (peer && (sock->sk->sk_state != SMC_ACTIVE) &&
2228 (sock->sk->sk_state != SMC_APPCLOSEWAIT1))
Ursula Braunac713872017-01-09 16:55:13 +01002229 return -ENOTCONN;
2230
2231 smc = smc_sk(sock->sk);
2232
Denys Vlasenko9b2c45d2018-02-12 20:00:20 +01002233 return smc->clcsock->ops->getname(smc->clcsock, addr, peer);
Ursula Braunac713872017-01-09 16:55:13 +01002234}
2235
2236static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
2237{
2238 struct sock *sk = sock->sk;
2239 struct smc_sock *smc;
2240 int rc = -EPIPE;
2241
2242 smc = smc_sk(sk);
2243 lock_sock(sk);
Ursula Braunb38d7322017-01-09 16:55:25 +01002244 if ((sk->sk_state != SMC_ACTIVE) &&
2245 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2246 (sk->sk_state != SMC_INIT))
Ursula Braunac713872017-01-09 16:55:13 +01002247 goto out;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002248
2249 if (msg->msg_flags & MSG_FASTOPEN) {
Ursula Brauncd206362019-08-02 10:47:50 +02002250 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002251 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002252 } else {
2253 rc = -EINVAL;
2254 goto out;
2255 }
2256 }
2257
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002258 if (smc->use_fallback) {
Ursula Braunac713872017-01-09 16:55:13 +01002259 rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002260 } else {
Ursula Braune6727f32017-01-09 16:55:23 +01002261 rc = smc_tx_sendmsg(smc, msg, len);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002262 SMC_STAT_TX_PAYLOAD(smc, len, rc);
2263 }
Ursula Braunac713872017-01-09 16:55:13 +01002264out:
2265 release_sock(sk);
2266 return rc;
2267}
2268
2269static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
2270 int flags)
2271{
2272 struct sock *sk = sock->sk;
2273 struct smc_sock *smc;
2274 int rc = -ENOTCONN;
2275
2276 smc = smc_sk(sk);
2277 lock_sock(sk);
Karsten Graul51c5aba2019-01-30 18:51:04 +01002278 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2279 /* socket was connected before, no more data to read */
2280 rc = 0;
2281 goto out;
2282 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002283 if ((sk->sk_state == SMC_INIT) ||
2284 (sk->sk_state == SMC_LISTEN) ||
2285 (sk->sk_state == SMC_CLOSED))
Ursula Braunac713872017-01-09 16:55:13 +01002286 goto out;
2287
Ursula Braunb38d7322017-01-09 16:55:25 +01002288 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2289 rc = 0;
2290 goto out;
2291 }
2292
Stefan Raspl9014db22018-05-03 18:12:39 +02002293 if (smc->use_fallback) {
Ursula Braunac713872017-01-09 16:55:13 +01002294 rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
Stefan Raspl9014db22018-05-03 18:12:39 +02002295 } else {
2296 msg->msg_namelen = 0;
2297 rc = smc_rx_recvmsg(smc, msg, NULL, len, flags);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002298 SMC_STAT_RX_PAYLOAD(smc, rc, rc);
Stefan Raspl9014db22018-05-03 18:12:39 +02002299 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002300
Ursula Braunac713872017-01-09 16:55:13 +01002301out:
2302 release_sock(sk);
2303 return rc;
2304}
2305
Al Viroade994f2017-07-03 00:01:49 -04002306static __poll_t smc_accept_poll(struct sock *parent)
Ursula Brauna046d572017-01-09 16:55:16 +01002307{
Ursula Braun8dce2782018-01-26 09:28:47 +01002308 struct smc_sock *isk = smc_sk(parent);
Al Viro63e24802018-02-01 10:02:53 -05002309 __poll_t mask = 0;
Ursula Brauna046d572017-01-09 16:55:16 +01002310
Ursula Braun8dce2782018-01-26 09:28:47 +01002311 spin_lock(&isk->accept_q_lock);
2312 if (!list_empty(&isk->accept_q))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002313 mask = EPOLLIN | EPOLLRDNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002314 spin_unlock(&isk->accept_q_lock);
Ursula Brauna046d572017-01-09 16:55:16 +01002315
Ursula Braun8dce2782018-01-26 09:28:47 +01002316 return mask;
Ursula Brauna046d572017-01-09 16:55:16 +01002317}
2318
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07002319static __poll_t smc_poll(struct file *file, struct socket *sock,
2320 poll_table *wait)
Ursula Braunac713872017-01-09 16:55:13 +01002321{
2322 struct sock *sk = sock->sk;
Ursula Braunac713872017-01-09 16:55:13 +01002323 struct smc_sock *smc;
Ursula Braun50717a32019-04-12 12:57:23 +02002324 __poll_t mask = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002325
Ursula Braun8dce2782018-01-26 09:28:47 +01002326 if (!sk)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002327 return EPOLLNVAL;
Ursula Braun8dce2782018-01-26 09:28:47 +01002328
Ursula Braunac713872017-01-09 16:55:13 +01002329 smc = smc_sk(sock->sk);
Ursula Braun648a5a7a2018-09-18 15:46:34 +02002330 if (smc->use_fallback) {
Ursula Brauna046d572017-01-09 16:55:16 +01002331 /* delegate to CLC child sock */
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07002332 mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
Ursula Braun784813a2018-05-02 16:53:56 +02002333 sk->sk_err = smc->clcsock->sk->sk_err;
Ursula Braunac713872017-01-09 16:55:13 +01002334 } else {
Linus Torvalds410da1e2018-07-03 09:53:43 -07002335 if (sk->sk_state != SMC_CLOSED)
Karsten Graul89ab0662018-10-23 13:40:39 +02002336 sock_poll_wait(file, sock, wait);
Ursula Brauna046d572017-01-09 16:55:16 +01002337 if (sk->sk_err)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002338 mask |= EPOLLERR;
Ursula Braunb38d7322017-01-09 16:55:25 +01002339 if ((sk->sk_shutdown == SHUTDOWN_MASK) ||
2340 (sk->sk_state == SMC_CLOSED))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002341 mask |= EPOLLHUP;
Ursula Braun8dce2782018-01-26 09:28:47 +01002342 if (sk->sk_state == SMC_LISTEN) {
2343 /* woken up by sk_data_ready in smc_listen_work() */
Ursula Braun50717a32019-04-12 12:57:23 +02002344 mask |= smc_accept_poll(sk);
2345 } else if (smc->use_fallback) { /* as result of connect_work()*/
2346 mask |= smc->clcsock->ops->poll(file, smc->clcsock,
2347 wait);
2348 sk->sk_err = smc->clcsock->sk->sk_err;
Ursula Braun8dce2782018-01-26 09:28:47 +01002349 } else {
Ursula Braun50717a32019-04-12 12:57:23 +02002350 if ((sk->sk_state != SMC_INIT &&
2351 atomic_read(&smc->conn.sndbuf_space)) ||
Ursula Braun8dce2782018-01-26 09:28:47 +01002352 sk->sk_shutdown & SEND_SHUTDOWN) {
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002353 mask |= EPOLLOUT | EPOLLWRNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002354 } else {
2355 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
2356 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
2357 }
2358 if (atomic_read(&smc->conn.bytes_to_rcv))
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002359 mask |= EPOLLIN | EPOLLRDNORM;
Ursula Braun8dce2782018-01-26 09:28:47 +01002360 if (sk->sk_shutdown & RCV_SHUTDOWN)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002361 mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
Ursula Braun8dce2782018-01-26 09:28:47 +01002362 if (sk->sk_state == SMC_APPCLOSEWAIT1)
Linus Torvaldsa9a08842018-02-11 14:34:03 -08002363 mask |= EPOLLIN;
Karsten Graul71d117f2018-09-18 15:46:37 +02002364 if (smc->conn.urg_state == SMC_URG_VALID)
2365 mask |= EPOLLPRI;
Ursula Braun8dce2782018-01-26 09:28:47 +01002366 }
Ursula Braunac713872017-01-09 16:55:13 +01002367 }
2368
2369 return mask;
2370}
2371
2372static int smc_shutdown(struct socket *sock, int how)
2373{
2374 struct sock *sk = sock->sk;
Tony Lubacb6c12021-11-26 10:41:35 +08002375 bool do_shutdown = true;
Ursula Braunac713872017-01-09 16:55:13 +01002376 struct smc_sock *smc;
2377 int rc = -EINVAL;
Tony Lubacb6c12021-11-26 10:41:35 +08002378 int old_state;
Ursula Braunb38d7322017-01-09 16:55:25 +01002379 int rc1 = 0;
Ursula Braunac713872017-01-09 16:55:13 +01002380
2381 smc = smc_sk(sk);
2382
2383 if ((how < SHUT_RD) || (how > SHUT_RDWR))
Ursula Braunb38d7322017-01-09 16:55:25 +01002384 return rc;
Ursula Braunac713872017-01-09 16:55:13 +01002385
2386 lock_sock(sk);
2387
2388 rc = -ENOTCONN;
Ursula Brauncaa21e12018-08-08 14:13:19 +02002389 if ((sk->sk_state != SMC_ACTIVE) &&
Ursula Braunb38d7322017-01-09 16:55:25 +01002390 (sk->sk_state != SMC_PEERCLOSEWAIT1) &&
2391 (sk->sk_state != SMC_PEERCLOSEWAIT2) &&
2392 (sk->sk_state != SMC_APPCLOSEWAIT1) &&
2393 (sk->sk_state != SMC_APPCLOSEWAIT2) &&
2394 (sk->sk_state != SMC_APPFINCLOSEWAIT))
Ursula Braunac713872017-01-09 16:55:13 +01002395 goto out;
2396 if (smc->use_fallback) {
2397 rc = kernel_sock_shutdown(smc->clcsock, how);
2398 sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
2399 if (sk->sk_shutdown == SHUTDOWN_MASK)
2400 sk->sk_state = SMC_CLOSED;
Ursula Braunb38d7322017-01-09 16:55:25 +01002401 goto out;
Ursula Braunac713872017-01-09 16:55:13 +01002402 }
Ursula Braunb38d7322017-01-09 16:55:25 +01002403 switch (how) {
2404 case SHUT_RDWR: /* shutdown in both directions */
Tony Lubacb6c12021-11-26 10:41:35 +08002405 old_state = sk->sk_state;
Ursula Braunb38d7322017-01-09 16:55:25 +01002406 rc = smc_close_active(smc);
Tony Lubacb6c12021-11-26 10:41:35 +08002407 if (old_state == SMC_ACTIVE &&
2408 sk->sk_state == SMC_PEERCLOSEWAIT1)
2409 do_shutdown = false;
Ursula Braunb38d7322017-01-09 16:55:25 +01002410 break;
2411 case SHUT_WR:
2412 rc = smc_close_shutdown_write(smc);
2413 break;
2414 case SHUT_RD:
Ursula Braun1255fcb2018-04-19 15:56:40 +02002415 rc = 0;
2416 /* nothing more to do because peer is not involved */
Ursula Braunb38d7322017-01-09 16:55:25 +01002417 break;
2418 }
Tony Lubacb6c12021-11-26 10:41:35 +08002419 if (do_shutdown && smc->clcsock)
Ursula Braun1255fcb2018-04-19 15:56:40 +02002420 rc1 = kernel_sock_shutdown(smc->clcsock, how);
Ursula Braunb38d7322017-01-09 16:55:25 +01002421 /* map sock_shutdown_cmd constants to sk_shutdown value range */
2422 sk->sk_shutdown |= how + 1;
Ursula Braunac713872017-01-09 16:55:13 +01002423
2424out:
2425 release_sock(sk);
Ursula Braunb38d7322017-01-09 16:55:25 +01002426 return rc ? rc : rc1;
Ursula Braunac713872017-01-09 16:55:13 +01002427}
2428
2429static int smc_setsockopt(struct socket *sock, int level, int optname,
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002430 sockptr_t optval, unsigned int optlen)
Ursula Braunac713872017-01-09 16:55:13 +01002431{
2432 struct sock *sk = sock->sk;
2433 struct smc_sock *smc;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002434 int val, rc;
Ursula Braunac713872017-01-09 16:55:13 +01002435
Cong Wang86214362021-05-05 12:40:48 -07002436 if (level == SOL_TCP && optname == TCP_ULP)
2437 return -EOPNOTSUPP;
2438
Ursula Braunac713872017-01-09 16:55:13 +01002439 smc = smc_sk(sk);
2440
2441 /* generic setsockopts reaching us here always apply to the
2442 * CLC socket
2443 */
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002444 if (unlikely(!smc->clcsock->ops->setsockopt))
2445 rc = -EOPNOTSUPP;
2446 else
2447 rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
2448 optval, optlen);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002449 if (smc->clcsock->sk->sk_err) {
2450 sk->sk_err = smc->clcsock->sk->sk_err;
Alexander Aringe3ae2362021-06-27 18:48:21 -04002451 sk_error_report(sk);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002452 }
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002453
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002454 if (optlen < sizeof(int))
Wei Yongjun3dc9f552018-05-31 02:31:22 +00002455 return -EINVAL;
Christoph Hellwiga7b75c52020-07-23 08:09:07 +02002456 if (copy_from_sockptr(&val, optval, sizeof(int)))
Ursula Braunac0107e2018-07-18 15:22:50 +02002457 return -EFAULT;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002458
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002459 lock_sock(sk);
Ursula Braun86434742019-12-12 22:35:58 +01002460 if (rc || smc->use_fallback)
2461 goto out;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002462 switch (optname) {
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002463 case TCP_FASTOPEN:
2464 case TCP_FASTOPEN_CONNECT:
2465 case TCP_FASTOPEN_KEY:
2466 case TCP_FASTOPEN_NO_COOKIE:
2467 /* option not supported by SMC */
Ursula Braun8204df72019-11-15 12:39:30 +01002468 if (sk->sk_state == SMC_INIT && !smc->connect_nonblock) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002469 smc_switch_to_fallback(smc, SMC_CLC_DECL_OPTUNSUPP);
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002470 } else {
Ursula Braun86434742019-12-12 22:35:58 +01002471 rc = -EINVAL;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002472 }
2473 break;
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002474 case TCP_NODELAY:
Ursula Braunf9cedf12019-08-02 10:16:38 +02002475 if (sk->sk_state != SMC_INIT &&
2476 sk->sk_state != SMC_LISTEN &&
2477 sk->sk_state != SMC_CLOSED) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002478 if (val) {
Guvenc Gulce194730a2021-06-16 16:52:58 +02002479 SMC_STAT_INC(smc, ndly_cnt);
Karsten Graul22ef4732020-09-10 18:48:29 +02002480 mod_delayed_work(smc->conn.lgr->tx_wq,
2481 &smc->conn.tx_work, 0);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002482 }
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002483 }
2484 break;
2485 case TCP_CORK:
Ursula Braunf9cedf12019-08-02 10:16:38 +02002486 if (sk->sk_state != SMC_INIT &&
2487 sk->sk_state != SMC_LISTEN &&
2488 sk->sk_state != SMC_CLOSED) {
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002489 if (!val) {
Guvenc Gulce194730a2021-06-16 16:52:58 +02002490 SMC_STAT_INC(smc, cork_cnt);
Karsten Graul22ef4732020-09-10 18:48:29 +02002491 mod_delayed_work(smc->conn.lgr->tx_wq,
2492 &smc->conn.tx_work, 0);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002493 }
Ursula Braun01d2f7e2018-04-26 17:18:22 +02002494 }
2495 break;
Ursula Braunabb190f2018-04-26 17:18:23 +02002496 case TCP_DEFER_ACCEPT:
2497 smc->sockopt_defer_accept = val;
2498 break;
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002499 default:
2500 break;
2501 }
Ursula Braun86434742019-12-12 22:35:58 +01002502out:
Ursula Braunee9dfbe2018-04-26 17:18:21 +02002503 release_sock(sk);
2504
2505 return rc;
Ursula Braunac713872017-01-09 16:55:13 +01002506}
2507
2508static int smc_getsockopt(struct socket *sock, int level, int optname,
2509 char __user *optval, int __user *optlen)
2510{
2511 struct smc_sock *smc;
2512
2513 smc = smc_sk(sock->sk);
2514 /* socket options apply to the CLC socket */
Christoph Hellwiga44d9e72020-07-17 08:23:31 +02002515 if (unlikely(!smc->clcsock->ops->getsockopt))
2516 return -EOPNOTSUPP;
Ursula Braunac713872017-01-09 16:55:13 +01002517 return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
2518 optval, optlen);
2519}
2520
2521static int smc_ioctl(struct socket *sock, unsigned int cmd,
2522 unsigned long arg)
2523{
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002524 union smc_host_cursor cons, urg;
2525 struct smc_connection *conn;
Ursula Braunac713872017-01-09 16:55:13 +01002526 struct smc_sock *smc;
Ursula Braun9b67e262018-05-02 16:56:46 +02002527 int answ;
Ursula Braunac713872017-01-09 16:55:13 +01002528
2529 smc = smc_sk(sock->sk);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002530 conn = &smc->conn;
Ursula Braun1992d992018-07-16 13:56:52 +02002531 lock_sock(&smc->sk);
Ursula Braun7311d662018-08-08 14:13:21 +02002532 if (smc->use_fallback) {
2533 if (!smc->clcsock) {
2534 release_sock(&smc->sk);
2535 return -EBADF;
2536 }
2537 answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
2538 release_sock(&smc->sk);
2539 return answ;
2540 }
Ursula Braun9b67e262018-05-02 16:56:46 +02002541 switch (cmd) {
2542 case SIOCINQ: /* same as FIONREAD */
Ursula Braun1992d992018-07-16 13:56:52 +02002543 if (smc->sk.sk_state == SMC_LISTEN) {
2544 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02002545 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02002546 }
Ursula Braun2351abe2018-05-23 16:38:09 +02002547 if (smc->sk.sk_state == SMC_INIT ||
2548 smc->sk.sk_state == SMC_CLOSED)
2549 answ = 0;
2550 else
2551 answ = atomic_read(&smc->conn.bytes_to_rcv);
Ursula Braun9b67e262018-05-02 16:56:46 +02002552 break;
2553 case SIOCOUTQ:
2554 /* output queue size (not send + not acked) */
Ursula Braun1992d992018-07-16 13:56:52 +02002555 if (smc->sk.sk_state == SMC_LISTEN) {
2556 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02002557 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02002558 }
Ursula Braun2351abe2018-05-23 16:38:09 +02002559 if (smc->sk.sk_state == SMC_INIT ||
2560 smc->sk.sk_state == SMC_CLOSED)
2561 answ = 0;
2562 else
2563 answ = smc->conn.sndbuf_desc->len -
Ursula Braun9b67e262018-05-02 16:56:46 +02002564 atomic_read(&smc->conn.sndbuf_space);
2565 break;
2566 case SIOCOUTQNSD:
2567 /* output queue size (not send only) */
Ursula Braun1992d992018-07-16 13:56:52 +02002568 if (smc->sk.sk_state == SMC_LISTEN) {
2569 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02002570 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02002571 }
Ursula Braun2351abe2018-05-23 16:38:09 +02002572 if (smc->sk.sk_state == SMC_INIT ||
2573 smc->sk.sk_state == SMC_CLOSED)
2574 answ = 0;
2575 else
2576 answ = smc_tx_prepared_sends(&smc->conn);
Ursula Braun9b67e262018-05-02 16:56:46 +02002577 break;
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002578 case SIOCATMARK:
Ursula Braun1992d992018-07-16 13:56:52 +02002579 if (smc->sk.sk_state == SMC_LISTEN) {
2580 release_sock(&smc->sk);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002581 return -EINVAL;
Ursula Braun1992d992018-07-16 13:56:52 +02002582 }
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002583 if (smc->sk.sk_state == SMC_INIT ||
2584 smc->sk.sk_state == SMC_CLOSED) {
2585 answ = 0;
2586 } else {
Stefan Rasplbac6de72018-07-23 13:53:09 +02002587 smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn);
2588 smc_curs_copy(&urg, &conn->urg_curs, conn);
Stefan Rasplde8474eb2018-05-23 16:38:11 +02002589 answ = smc_curs_diff(conn->rmb_desc->len,
2590 &cons, &urg) == 1;
2591 }
2592 break;
Ursula Braun9b67e262018-05-02 16:56:46 +02002593 default:
Ursula Braun1992d992018-07-16 13:56:52 +02002594 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02002595 return -ENOIOCTLCMD;
2596 }
Ursula Braun1992d992018-07-16 13:56:52 +02002597 release_sock(&smc->sk);
Ursula Braun9b67e262018-05-02 16:56:46 +02002598
2599 return put_user(answ, (int __user *)arg);
Ursula Braunac713872017-01-09 16:55:13 +01002600}
2601
2602static ssize_t smc_sendpage(struct socket *sock, struct page *page,
2603 int offset, size_t size, int flags)
2604{
2605 struct sock *sk = sock->sk;
2606 struct smc_sock *smc;
2607 int rc = -EPIPE;
2608
2609 smc = smc_sk(sk);
2610 lock_sock(sk);
Stefan Rasplbda27ff2018-05-03 17:57:39 +02002611 if (sk->sk_state != SMC_ACTIVE) {
2612 release_sock(sk);
Ursula Braunac713872017-01-09 16:55:13 +01002613 goto out;
Stefan Rasplbda27ff2018-05-03 17:57:39 +02002614 }
2615 release_sock(sk);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002616 if (smc->use_fallback) {
Ursula Braunac713872017-01-09 16:55:13 +01002617 rc = kernel_sendpage(smc->clcsock, page, offset,
2618 size, flags);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002619 } else {
Guvenc Gulce194730a2021-06-16 16:52:58 +02002620 SMC_STAT_INC(smc, sendpage_cnt);
Ursula Braunac713872017-01-09 16:55:13 +01002621 rc = sock_no_sendpage(sock, page, offset, size, flags);
Guvenc Gulcee0e4b8f2021-06-16 16:52:55 +02002622 }
Ursula Braunac713872017-01-09 16:55:13 +01002623
2624out:
Ursula Braunac713872017-01-09 16:55:13 +01002625 return rc;
2626}
2627
Stefan Raspl9014db22018-05-03 18:12:39 +02002628/* Map the affected portions of the rmbe into an spd, note the number of bytes
2629 * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor
2630 * updates till whenever a respective page has been fully processed.
2631 * Note that subsequent recv() calls have to wait till all splice() processing
2632 * completed.
2633 */
Ursula Braunac713872017-01-09 16:55:13 +01002634static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
2635 struct pipe_inode_info *pipe, size_t len,
Stefan Raspl9014db22018-05-03 18:12:39 +02002636 unsigned int flags)
Ursula Braunac713872017-01-09 16:55:13 +01002637{
2638 struct sock *sk = sock->sk;
2639 struct smc_sock *smc;
2640 int rc = -ENOTCONN;
2641
2642 smc = smc_sk(sk);
2643 lock_sock(sk);
Karsten Graul51c5aba2019-01-30 18:51:04 +01002644 if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) {
2645 /* socket was connected before, no more data to read */
2646 rc = 0;
2647 goto out;
2648 }
Stefan Raspl9014db22018-05-03 18:12:39 +02002649 if (sk->sk_state == SMC_INIT ||
2650 sk->sk_state == SMC_LISTEN ||
2651 sk->sk_state == SMC_CLOSED)
Ursula Braunac713872017-01-09 16:55:13 +01002652 goto out;
Stefan Raspl9014db22018-05-03 18:12:39 +02002653
2654 if (sk->sk_state == SMC_PEERFINCLOSEWAIT) {
2655 rc = 0;
2656 goto out;
2657 }
2658
Ursula Braunac713872017-01-09 16:55:13 +01002659 if (smc->use_fallback) {
2660 rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
2661 pipe, len, flags);
2662 } else {
Stefan Raspl9014db22018-05-03 18:12:39 +02002663 if (*ppos) {
2664 rc = -ESPIPE;
2665 goto out;
2666 }
2667 if (flags & SPLICE_F_NONBLOCK)
2668 flags = MSG_DONTWAIT;
2669 else
2670 flags = 0;
Guvenc Gulce194730a2021-06-16 16:52:58 +02002671 SMC_STAT_INC(smc, splice_cnt);
Stefan Raspl9014db22018-05-03 18:12:39 +02002672 rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
Ursula Braunac713872017-01-09 16:55:13 +01002673 }
2674out:
2675 release_sock(sk);
Stefan Raspl9014db22018-05-03 18:12:39 +02002676
Ursula Braunac713872017-01-09 16:55:13 +01002677 return rc;
2678}
2679
2680/* must look like tcp */
2681static const struct proto_ops smc_sock_ops = {
2682 .family = PF_SMC,
2683 .owner = THIS_MODULE,
2684 .release = smc_release,
2685 .bind = smc_bind,
2686 .connect = smc_connect,
2687 .socketpair = sock_no_socketpair,
2688 .accept = smc_accept,
2689 .getname = smc_getname,
Linus Torvaldsa11e1d42018-06-28 09:43:44 -07002690 .poll = smc_poll,
Ursula Braunac713872017-01-09 16:55:13 +01002691 .ioctl = smc_ioctl,
2692 .listen = smc_listen,
2693 .shutdown = smc_shutdown,
2694 .setsockopt = smc_setsockopt,
2695 .getsockopt = smc_getsockopt,
2696 .sendmsg = smc_sendmsg,
2697 .recvmsg = smc_recvmsg,
2698 .mmap = sock_no_mmap,
2699 .sendpage = smc_sendpage,
2700 .splice_read = smc_splice_read,
2701};
2702
2703static int smc_create(struct net *net, struct socket *sock, int protocol,
2704 int kern)
2705{
Karsten Graulaaa4d332018-03-16 15:06:41 +01002706 int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET;
Ursula Braunac713872017-01-09 16:55:13 +01002707 struct smc_sock *smc;
2708 struct sock *sk;
2709 int rc;
2710
2711 rc = -ESOCKTNOSUPPORT;
2712 if (sock->type != SOCK_STREAM)
2713 goto out;
2714
2715 rc = -EPROTONOSUPPORT;
Karsten Graulaaa4d332018-03-16 15:06:41 +01002716 if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6)
Ursula Braunac713872017-01-09 16:55:13 +01002717 goto out;
2718
2719 rc = -ENOBUFS;
2720 sock->ops = &smc_sock_ops;
Karsten Graulaaa4d332018-03-16 15:06:41 +01002721 sk = smc_sock_alloc(net, sock, protocol);
Ursula Braunac713872017-01-09 16:55:13 +01002722 if (!sk)
2723 goto out;
2724
2725 /* create internal TCP socket for CLC handshake and fallback */
2726 smc = smc_sk(sk);
Ursula Brauna046d572017-01-09 16:55:16 +01002727 smc->use_fallback = false; /* assume rdma capability first */
Karsten Graul603cc142018-07-25 16:35:32 +02002728 smc->fallback_rsn = 0;
Karsten Graulaaa4d332018-03-16 15:06:41 +01002729 rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP,
2730 &smc->clcsock);
Davide Carattia5dcb732018-02-28 12:44:09 +01002731 if (rc) {
Ursula Braunac713872017-01-09 16:55:13 +01002732 sk_common_release(sk);
Davide Carattia5dcb732018-02-28 12:44:09 +01002733 goto out;
2734 }
Ursula Brauncd6851f2017-01-09 16:55:18 +01002735 smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE);
2736 smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE);
Ursula Braunac713872017-01-09 16:55:13 +01002737
2738out:
2739 return rc;
2740}
2741
2742static const struct net_proto_family smc_sock_family_ops = {
2743 .family = PF_SMC,
2744 .owner = THIS_MODULE,
2745 .create = smc_create,
2746};
2747
Hans Wippel64e28b52019-02-21 13:01:02 +01002748unsigned int smc_net_id;
2749
2750static __net_init int smc_net_init(struct net *net)
2751{
2752 return smc_pnet_net_init(net);
2753}
2754
2755static void __net_exit smc_net_exit(struct net *net)
2756{
2757 smc_pnet_net_exit(net);
2758}
2759
Guvenc Gulce194730a2021-06-16 16:52:58 +02002760static __net_init int smc_net_stat_init(struct net *net)
2761{
2762 return smc_stats_init(net);
2763}
2764
2765static void __net_exit smc_net_stat_exit(struct net *net)
2766{
2767 smc_stats_exit(net);
2768}
2769
Hans Wippel64e28b52019-02-21 13:01:02 +01002770static struct pernet_operations smc_net_ops = {
2771 .init = smc_net_init,
2772 .exit = smc_net_exit,
2773 .id = &smc_net_id,
2774 .size = sizeof(struct smc_net),
2775};
2776
Guvenc Gulce194730a2021-06-16 16:52:58 +02002777static struct pernet_operations smc_net_stat_ops = {
2778 .init = smc_net_stat_init,
2779 .exit = smc_net_stat_exit,
2780};
2781
Ursula Braunac713872017-01-09 16:55:13 +01002782static int __init smc_init(void)
2783{
2784 int rc;
2785
Hans Wippel64e28b52019-02-21 13:01:02 +01002786 rc = register_pernet_subsys(&smc_net_ops);
2787 if (rc)
2788 return rc;
2789
Guvenc Gulce194730a2021-06-16 16:52:58 +02002790 rc = register_pernet_subsys(&smc_net_stat_ops);
2791 if (rc)
2792 return rc;
2793
Ursula Braun201091e2020-09-26 12:44:24 +02002794 smc_ism_init();
Ursula Braunb81a5eb2020-09-26 12:44:31 +02002795 smc_clc_init();
Ursula Braun201091e2020-09-26 12:44:24 +02002796
Guvenc Gulcee8372d92020-12-01 20:20:43 +01002797 rc = smc_nl_init();
Thomas Richter6812baa2017-01-09 16:55:15 +01002798 if (rc)
YueHaibing8c33bf12019-06-26 17:47:50 +02002799 goto out_pernet_subsys;
Thomas Richter6812baa2017-01-09 16:55:15 +01002800
Guvenc Gulcee8372d92020-12-01 20:20:43 +01002801 rc = smc_pnet_init();
2802 if (rc)
2803 goto out_nl;
2804
Karsten Graul22ef4732020-09-10 18:48:29 +02002805 rc = -ENOMEM;
2806 smc_hs_wq = alloc_workqueue("smc_hs_wq", 0, 0);
2807 if (!smc_hs_wq)
2808 goto out_pnet;
2809
2810 smc_close_wq = alloc_workqueue("smc_close_wq", 0, 0);
2811 if (!smc_close_wq)
2812 goto out_alloc_hs_wq;
2813
Ursula Braun6dabd402019-11-16 17:47:29 +01002814 rc = smc_core_init();
2815 if (rc) {
2816 pr_err("%s: smc_core_init fails with %d\n", __func__, rc);
Guvenc Gulce194730a2021-06-16 16:52:58 +02002817 goto out_alloc_wqs;
Ursula Braun6dabd402019-11-16 17:47:29 +01002818 }
2819
Ursula Braun9bf9abe2017-01-09 16:55:21 +01002820 rc = smc_llc_init();
2821 if (rc) {
2822 pr_err("%s: smc_llc_init fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01002823 goto out_core;
Ursula Braun9bf9abe2017-01-09 16:55:21 +01002824 }
2825
Ursula Braun5f083182017-01-09 16:55:22 +01002826 rc = smc_cdc_init();
2827 if (rc) {
2828 pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01002829 goto out_core;
Ursula Braun5f083182017-01-09 16:55:22 +01002830 }
2831
Ursula Braunac713872017-01-09 16:55:13 +01002832 rc = proto_register(&smc_proto, 1);
2833 if (rc) {
Karsten Graulaaa4d332018-03-16 15:06:41 +01002834 pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc);
Ursula Braun6dabd402019-11-16 17:47:29 +01002835 goto out_core;
Ursula Braunac713872017-01-09 16:55:13 +01002836 }
2837
Karsten Graulaaa4d332018-03-16 15:06:41 +01002838 rc = proto_register(&smc_proto6, 1);
2839 if (rc) {
2840 pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc);
2841 goto out_proto;
2842 }
2843
Ursula Braunac713872017-01-09 16:55:13 +01002844 rc = sock_register(&smc_sock_family_ops);
2845 if (rc) {
2846 pr_err("%s: sock_register fails with %d\n", __func__, rc);
Karsten Graulaaa4d332018-03-16 15:06:41 +01002847 goto out_proto6;
Ursula Braunac713872017-01-09 16:55:13 +01002848 }
Ursula Braunf16a7dd2017-01-09 16:55:26 +01002849 INIT_HLIST_HEAD(&smc_v4_hashinfo.ht);
Karsten Graulaaa4d332018-03-16 15:06:41 +01002850 INIT_HLIST_HEAD(&smc_v6_hashinfo.ht);
Ursula Braunac713872017-01-09 16:55:13 +01002851
Ursula Brauna4cf0442017-01-09 16:55:14 +01002852 rc = smc_ib_register_client();
2853 if (rc) {
2854 pr_err("%s: ib_register fails with %d\n", __func__, rc);
2855 goto out_sock;
2856 }
2857
Ursula Braunc5c1cc92017-10-25 11:01:46 +02002858 static_branch_enable(&tcp_have_smc);
Ursula Braunac713872017-01-09 16:55:13 +01002859 return 0;
2860
Ursula Brauna4cf0442017-01-09 16:55:14 +01002861out_sock:
2862 sock_unregister(PF_SMC);
Karsten Graulaaa4d332018-03-16 15:06:41 +01002863out_proto6:
2864 proto_unregister(&smc_proto6);
Ursula Braunac713872017-01-09 16:55:13 +01002865out_proto:
2866 proto_unregister(&smc_proto);
Ursula Braun6dabd402019-11-16 17:47:29 +01002867out_core:
2868 smc_core_exit();
Karsten Graul22ef4732020-09-10 18:48:29 +02002869out_alloc_wqs:
2870 destroy_workqueue(smc_close_wq);
2871out_alloc_hs_wq:
2872 destroy_workqueue(smc_hs_wq);
Thomas Richter6812baa2017-01-09 16:55:15 +01002873out_pnet:
2874 smc_pnet_exit();
Guvenc Gulcee8372d92020-12-01 20:20:43 +01002875out_nl:
2876 smc_nl_exit();
YueHaibing8c33bf12019-06-26 17:47:50 +02002877out_pernet_subsys:
2878 unregister_pernet_subsys(&smc_net_ops);
2879
Ursula Braunac713872017-01-09 16:55:13 +01002880 return rc;
2881}
2882
2883static void __exit smc_exit(void)
2884{
Ursula Braunc5c1cc92017-10-25 11:01:46 +02002885 static_branch_disable(&tcp_have_smc);
Ursula Braunac713872017-01-09 16:55:13 +01002886 sock_unregister(PF_SMC);
Ursula Braun6dabd402019-11-16 17:47:29 +01002887 smc_core_exit();
2888 smc_ib_unregister_client();
Karsten Graul22ef4732020-09-10 18:48:29 +02002889 destroy_workqueue(smc_close_wq);
2890 destroy_workqueue(smc_hs_wq);
Karsten Graulaaa4d332018-03-16 15:06:41 +01002891 proto_unregister(&smc_proto6);
Ursula Braunac713872017-01-09 16:55:13 +01002892 proto_unregister(&smc_proto);
Thomas Richter6812baa2017-01-09 16:55:15 +01002893 smc_pnet_exit();
Guvenc Gulcee8372d92020-12-01 20:20:43 +01002894 smc_nl_exit();
Karsten Graulfa086662021-09-14 10:35:05 +02002895 smc_clc_exit();
Guvenc Gulce194730a2021-06-16 16:52:58 +02002896 unregister_pernet_subsys(&smc_net_stat_ops);
Hans Wippel64e28b52019-02-21 13:01:02 +01002897 unregister_pernet_subsys(&smc_net_ops);
Ursula Braun4ead9c92019-11-16 17:47:31 +01002898 rcu_barrier();
Ursula Braunac713872017-01-09 16:55:13 +01002899}
2900
2901module_init(smc_init);
2902module_exit(smc_exit);
2903
2904MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
2905MODULE_DESCRIPTION("smc socket address family");
2906MODULE_LICENSE("GPL");
2907MODULE_ALIAS_NETPROTO(PF_SMC);