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Commit | Line | Data |
---|---|---|
ac713874 UB |
1 | /* |
2 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
3 | * | |
4 | * AF_SMC protocol family socket handler keeping the AF_INET sock address type | |
5 | * applies to SOCK_STREAM sockets only | |
6 | * offers an alternative communication option for TCP-protocol sockets | |
7 | * applicable with RoCE-cards only | |
8 | * | |
a046d57d | 9 | * Initial restrictions: |
a046d57d | 10 | * - support for alternate links postponed |
a046d57d | 11 | * |
aaa4d33f | 12 | * Copyright IBM Corp. 2016, 2018 |
ac713874 UB |
13 | * |
14 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
15 | * based on prototype from Frank Blaschka | |
16 | */ | |
17 | ||
18 | #define KMSG_COMPONENT "smc" | |
19 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
20 | ||
21 | #include <linux/module.h> | |
22 | #include <linux/socket.h> | |
a046d57d | 23 | #include <linux/workqueue.h> |
5f08318f | 24 | #include <linux/in.h> |
c3edc401 | 25 | #include <linux/sched/signal.h> |
41349844 | 26 | #include <linux/if_vlan.h> |
c3edc401 | 27 | |
ac713874 | 28 | #include <net/sock.h> |
a046d57d | 29 | #include <net/tcp.h> |
f16a7dd5 | 30 | #include <net/smc.h> |
9b67e26f | 31 | #include <asm/ioctls.h> |
ac713874 | 32 | |
64e28b52 HW |
33 | #include <net/net_namespace.h> |
34 | #include <net/netns/generic.h> | |
35 | #include "smc_netns.h" | |
36 | ||
ac713874 | 37 | #include "smc.h" |
a046d57d | 38 | #include "smc_clc.h" |
9bf9abea | 39 | #include "smc_llc.h" |
5f08318f | 40 | #include "smc_cdc.h" |
0cfdd8f9 | 41 | #include "smc_core.h" |
a4cf0443 | 42 | #include "smc_ib.h" |
41349844 | 43 | #include "smc_ism.h" |
6812baab | 44 | #include "smc_pnet.h" |
e6727f39 | 45 | #include "smc_tx.h" |
952310cc | 46 | #include "smc_rx.h" |
b38d7324 | 47 | #include "smc_close.h" |
ac713874 | 48 | |
72a36a8a HW |
49 | static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group |
50 | * creation on server | |
51 | */ | |
52 | static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group | |
53 | * creation on client | |
0cfdd8f9 UB |
54 | */ |
55 | ||
a046d57d | 56 | static void smc_tcp_listen_work(struct work_struct *); |
24ac3a08 | 57 | static void smc_connect_work(struct work_struct *); |
a046d57d | 58 | |
ac713874 UB |
59 | static void smc_set_keepalive(struct sock *sk, int val) |
60 | { | |
61 | struct smc_sock *smc = smc_sk(sk); | |
62 | ||
63 | smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); | |
64 | } | |
65 | ||
f16a7dd5 UB |
66 | static struct smc_hashinfo smc_v4_hashinfo = { |
67 | .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), | |
68 | }; | |
69 | ||
aaa4d33f KG |
70 | static struct smc_hashinfo smc_v6_hashinfo = { |
71 | .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), | |
72 | }; | |
73 | ||
f16a7dd5 UB |
74 | int smc_hash_sk(struct sock *sk) |
75 | { | |
76 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
77 | struct hlist_head *head; | |
78 | ||
79 | head = &h->ht; | |
80 | ||
81 | write_lock_bh(&h->lock); | |
82 | sk_add_node(sk, head); | |
83 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
84 | write_unlock_bh(&h->lock); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(smc_hash_sk); | |
89 | ||
90 | void smc_unhash_sk(struct sock *sk) | |
91 | { | |
92 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
93 | ||
94 | write_lock_bh(&h->lock); | |
95 | if (sk_del_node_init(sk)) | |
96 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
97 | write_unlock_bh(&h->lock); | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(smc_unhash_sk); | |
100 | ||
101 | struct proto smc_proto = { | |
ac713874 UB |
102 | .name = "SMC", |
103 | .owner = THIS_MODULE, | |
104 | .keepalive = smc_set_keepalive, | |
f16a7dd5 UB |
105 | .hash = smc_hash_sk, |
106 | .unhash = smc_unhash_sk, | |
ac713874 | 107 | .obj_size = sizeof(struct smc_sock), |
f16a7dd5 | 108 | .h.smc_hash = &smc_v4_hashinfo, |
5f0d5a3a | 109 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
ac713874 | 110 | }; |
f16a7dd5 | 111 | EXPORT_SYMBOL_GPL(smc_proto); |
ac713874 | 112 | |
aaa4d33f KG |
113 | struct proto smc_proto6 = { |
114 | .name = "SMC6", | |
115 | .owner = THIS_MODULE, | |
116 | .keepalive = smc_set_keepalive, | |
117 | .hash = smc_hash_sk, | |
118 | .unhash = smc_unhash_sk, | |
119 | .obj_size = sizeof(struct smc_sock), | |
120 | .h.smc_hash = &smc_v6_hashinfo, | |
121 | .slab_flags = SLAB_TYPESAFE_BY_RCU, | |
122 | }; | |
123 | EXPORT_SYMBOL_GPL(smc_proto6); | |
124 | ||
ac713874 UB |
125 | static int smc_release(struct socket *sock) |
126 | { | |
127 | struct sock *sk = sock->sk; | |
128 | struct smc_sock *smc; | |
b38d7324 | 129 | int rc = 0; |
ac713874 UB |
130 | |
131 | if (!sk) | |
132 | goto out; | |
133 | ||
134 | smc = smc_sk(sk); | |
24ac3a08 UB |
135 | |
136 | /* cleanup for a dangling non-blocking connect */ | |
50717a37 | 137 | if (smc->connect_nonblock && sk->sk_state == SMC_INIT) |
f07920ad | 138 | tcp_abort(smc->clcsock->sk, ECONNABORTED); |
24ac3a08 | 139 | flush_work(&smc->connect_work); |
24ac3a08 | 140 | |
b38d7324 UB |
141 | if (sk->sk_state == SMC_LISTEN) |
142 | /* smc_close_non_accepted() is called and acquires | |
143 | * sock lock for child sockets again | |
144 | */ | |
145 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
146 | else | |
147 | lock_sock(sk); | |
ac713874 | 148 | |
51f1de79 | 149 | if (!smc->use_fallback) { |
b38d7324 UB |
150 | rc = smc_close_active(smc); |
151 | sock_set_flag(sk, SOCK_DEAD); | |
152 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
b03faa1f UB |
153 | } else { |
154 | if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) | |
155 | sock_put(sk); /* passive closing */ | |
156 | if (sk->sk_state == SMC_LISTEN) { | |
78abe3d0 MJ |
157 | /* wake up clcsock accept */ |
158 | rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); | |
159 | } | |
51f1de79 UB |
160 | sk->sk_state = SMC_CLOSED; |
161 | sk->sk_state_change(sk); | |
162 | } | |
ac713874 | 163 | |
b03faa1f UB |
164 | sk->sk_prot->unhash(sk); |
165 | ||
166 | if (sk->sk_state == SMC_CLOSED) { | |
167 | if (smc->clcsock) { | |
168 | mutex_lock(&smc->clcsock_release_lock); | |
169 | sock_release(smc->clcsock); | |
170 | smc->clcsock = NULL; | |
171 | mutex_unlock(&smc->clcsock_release_lock); | |
172 | } | |
173 | if (!smc->use_fallback) | |
174 | smc_conn_free(&smc->conn); | |
175 | } | |
176 | ||
ac713874 UB |
177 | /* detach socket */ |
178 | sock_orphan(sk); | |
179 | sock->sk = NULL; | |
180 | release_sock(sk); | |
181 | ||
51f1de79 | 182 | sock_put(sk); /* final sock_put */ |
ac713874 | 183 | out: |
b38d7324 | 184 | return rc; |
ac713874 UB |
185 | } |
186 | ||
187 | static void smc_destruct(struct sock *sk) | |
188 | { | |
189 | if (sk->sk_state != SMC_CLOSED) | |
190 | return; | |
191 | if (!sock_flag(sk, SOCK_DEAD)) | |
192 | return; | |
193 | ||
194 | sk_refcnt_debug_dec(sk); | |
195 | } | |
196 | ||
aaa4d33f KG |
197 | static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, |
198 | int protocol) | |
ac713874 UB |
199 | { |
200 | struct smc_sock *smc; | |
aaa4d33f | 201 | struct proto *prot; |
ac713874 UB |
202 | struct sock *sk; |
203 | ||
aaa4d33f KG |
204 | prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; |
205 | sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); | |
ac713874 UB |
206 | if (!sk) |
207 | return NULL; | |
208 | ||
209 | sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ | |
210 | sk->sk_state = SMC_INIT; | |
211 | sk->sk_destruct = smc_destruct; | |
aaa4d33f | 212 | sk->sk_protocol = protocol; |
ac713874 | 213 | smc = smc_sk(sk); |
a046d57d | 214 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
24ac3a08 | 215 | INIT_WORK(&smc->connect_work, smc_connect_work); |
be7f3e59 | 216 | INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); |
a046d57d UB |
217 | INIT_LIST_HEAD(&smc->accept_q); |
218 | spin_lock_init(&smc->accept_q_lock); | |
be7f3e59 | 219 | spin_lock_init(&smc->conn.send_lock); |
f16a7dd5 | 220 | sk->sk_prot->hash(sk); |
a046d57d | 221 | sk_refcnt_debug_inc(sk); |
78abe3d0 | 222 | mutex_init(&smc->clcsock_release_lock); |
ac713874 UB |
223 | |
224 | return sk; | |
225 | } | |
226 | ||
227 | static int smc_bind(struct socket *sock, struct sockaddr *uaddr, | |
228 | int addr_len) | |
229 | { | |
230 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
231 | struct sock *sk = sock->sk; | |
232 | struct smc_sock *smc; | |
233 | int rc; | |
234 | ||
235 | smc = smc_sk(sk); | |
236 | ||
237 | /* replicate tests from inet_bind(), to be safe wrt. future changes */ | |
238 | rc = -EINVAL; | |
239 | if (addr_len < sizeof(struct sockaddr_in)) | |
240 | goto out; | |
241 | ||
242 | rc = -EAFNOSUPPORT; | |
aaa4d33f KG |
243 | if (addr->sin_family != AF_INET && |
244 | addr->sin_family != AF_INET6 && | |
245 | addr->sin_family != AF_UNSPEC) | |
246 | goto out; | |
ac713874 | 247 | /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ |
aaa4d33f KG |
248 | if (addr->sin_family == AF_UNSPEC && |
249 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
ac713874 UB |
250 | goto out; |
251 | ||
252 | lock_sock(sk); | |
253 | ||
254 | /* Check if socket is already active */ | |
255 | rc = -EINVAL; | |
256 | if (sk->sk_state != SMC_INIT) | |
257 | goto out_rel; | |
258 | ||
259 | smc->clcsock->sk->sk_reuse = sk->sk_reuse; | |
260 | rc = kernel_bind(smc->clcsock, uaddr, addr_len); | |
261 | ||
262 | out_rel: | |
263 | release_sock(sk); | |
264 | out: | |
265 | return rc; | |
266 | } | |
267 | ||
268 | static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, | |
269 | unsigned long mask) | |
270 | { | |
271 | /* options we don't get control via setsockopt for */ | |
272 | nsk->sk_type = osk->sk_type; | |
273 | nsk->sk_sndbuf = osk->sk_sndbuf; | |
274 | nsk->sk_rcvbuf = osk->sk_rcvbuf; | |
275 | nsk->sk_sndtimeo = osk->sk_sndtimeo; | |
276 | nsk->sk_rcvtimeo = osk->sk_rcvtimeo; | |
277 | nsk->sk_mark = osk->sk_mark; | |
278 | nsk->sk_priority = osk->sk_priority; | |
279 | nsk->sk_rcvlowat = osk->sk_rcvlowat; | |
280 | nsk->sk_bound_dev_if = osk->sk_bound_dev_if; | |
281 | nsk->sk_err = osk->sk_err; | |
282 | ||
283 | nsk->sk_flags &= ~mask; | |
284 | nsk->sk_flags |= osk->sk_flags & mask; | |
285 | } | |
286 | ||
287 | #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ | |
288 | (1UL << SOCK_KEEPOPEN) | \ | |
289 | (1UL << SOCK_LINGER) | \ | |
290 | (1UL << SOCK_BROADCAST) | \ | |
291 | (1UL << SOCK_TIMESTAMP) | \ | |
292 | (1UL << SOCK_DBG) | \ | |
293 | (1UL << SOCK_RCVTSTAMP) | \ | |
294 | (1UL << SOCK_RCVTSTAMPNS) | \ | |
295 | (1UL << SOCK_LOCALROUTE) | \ | |
296 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
297 | (1UL << SOCK_RXQ_OVFL) | \ | |
298 | (1UL << SOCK_WIFI_STATUS) | \ | |
299 | (1UL << SOCK_NOFCS) | \ | |
9718475e DD |
300 | (1UL << SOCK_FILTER_LOCKED) | \ |
301 | (1UL << SOCK_TSTAMP_NEW)) | |
ac713874 UB |
302 | /* copy only relevant settings and flags of SOL_SOCKET level from smc to |
303 | * clc socket (since smc is not called for these options from net/core) | |
304 | */ | |
305 | static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) | |
306 | { | |
307 | smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); | |
308 | } | |
309 | ||
310 | #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ | |
311 | (1UL << SOCK_KEEPOPEN) | \ | |
312 | (1UL << SOCK_LINGER) | \ | |
313 | (1UL << SOCK_DBG)) | |
314 | /* copy only settings and flags relevant for smc from clc to smc socket */ | |
315 | static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) | |
316 | { | |
317 | smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); | |
318 | } | |
319 | ||
c7674c00 | 320 | /* register a new rmb, send confirm_rkey msg to register with peer */ |
44aa81ce KG |
321 | static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, |
322 | bool conf_rkey) | |
e63a5f8c | 323 | { |
c7674c00 KG |
324 | if (!rmb_desc->wr_reg) { |
325 | /* register memory region for new rmb */ | |
326 | if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { | |
327 | rmb_desc->regerr = 1; | |
328 | return -EFAULT; | |
329 | } | |
330 | rmb_desc->wr_reg = 1; | |
a6920d1d | 331 | } |
44aa81ce KG |
332 | if (!conf_rkey) |
333 | return 0; | |
334 | /* exchange confirm_rkey msg with peer */ | |
335 | if (smc_llc_do_confirm_rkey(link, rmb_desc)) { | |
336 | rmb_desc->regerr = 1; | |
337 | return -EFAULT; | |
338 | } | |
e63a5f8c KG |
339 | return 0; |
340 | } | |
341 | ||
0f627126 | 342 | static int smc_clnt_conf_first_link(struct smc_sock *smc) |
9bf9abea | 343 | { |
877ae5be | 344 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
345 | struct smc_link_group *lgr = smc->conn.lgr; |
346 | struct smc_link *link; | |
347 | int rest; | |
348 | int rc; | |
349 | ||
350 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
351 | /* receive CONFIRM LINK request from server over RoCE fabric */ | |
352 | rest = wait_for_completion_interruptible_timeout( | |
353 | &link->llc_confirm, | |
354 | SMC_LLC_WAIT_FIRST_TIME); | |
355 | if (rest <= 0) { | |
356 | struct smc_clc_msg_decline dclc; | |
357 | ||
358 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
2b59f58e | 359 | SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
9ed28556 | 360 | return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; |
9bf9abea UB |
361 | } |
362 | ||
75d320d6 KG |
363 | if (link->llc_confirm_rc) |
364 | return SMC_CLC_DECL_RMBE_EC; | |
365 | ||
9bf9abea UB |
366 | rc = smc_ib_modify_qp_rts(link); |
367 | if (rc) | |
603cc149 | 368 | return SMC_CLC_DECL_ERR_RDYLNK; |
9bf9abea UB |
369 | |
370 | smc_wr_remember_qp_attr(link); | |
652a1e41 | 371 | |
44aa81ce | 372 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
603cc149 | 373 | return SMC_CLC_DECL_ERR_REGRMB; |
652a1e41 | 374 | |
9bf9abea | 375 | /* send CONFIRM LINK response over RoCE fabric */ |
947541f3 | 376 | rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); |
9bf9abea | 377 | if (rc < 0) |
603cc149 | 378 | return SMC_CLC_DECL_TIMEOUT_CL; |
9bf9abea | 379 | |
52bedf37 KG |
380 | /* receive ADD LINK request from server over RoCE fabric */ |
381 | rest = wait_for_completion_interruptible_timeout(&link->llc_add, | |
382 | SMC_LLC_WAIT_TIME); | |
383 | if (rest <= 0) { | |
384 | struct smc_clc_msg_decline dclc; | |
385 | ||
386 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
2b59f58e | 387 | SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
9ed28556 | 388 | return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc; |
52bedf37 KG |
389 | } |
390 | ||
391 | /* send add link reject message, only one link supported for now */ | |
392 | rc = smc_llc_send_add_link(link, | |
393 | link->smcibdev->mac[link->ibport - 1], | |
7005ada6 | 394 | link->gid, SMC_LLC_RESP); |
52bedf37 | 395 | if (rc < 0) |
603cc149 | 396 | return SMC_CLC_DECL_TIMEOUT_AL; |
52bedf37 | 397 | |
877ae5be | 398 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 399 | |
75d320d6 | 400 | return 0; |
9bf9abea UB |
401 | } |
402 | ||
41349844 HW |
403 | static void smcr_conn_save_peer_info(struct smc_sock *smc, |
404 | struct smc_clc_msg_accept_confirm *clc) | |
0cfdd8f9 | 405 | { |
95d8d263 HW |
406 | int bufsize = smc_uncompress_bufsize(clc->rmbe_size); |
407 | ||
92a138e3 | 408 | smc->conn.peer_rmbe_idx = clc->rmbe_idx; |
5f08318f | 409 | smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); |
95d8d263 | 410 | smc->conn.peer_rmbe_size = bufsize; |
cd6851f3 | 411 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); |
95d8d263 | 412 | smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); |
0cfdd8f9 UB |
413 | } |
414 | ||
41349844 HW |
415 | static void smcd_conn_save_peer_info(struct smc_sock *smc, |
416 | struct smc_clc_msg_accept_confirm *clc) | |
417 | { | |
418 | int bufsize = smc_uncompress_bufsize(clc->dmbe_size); | |
419 | ||
420 | smc->conn.peer_rmbe_idx = clc->dmbe_idx; | |
421 | smc->conn.peer_token = clc->token; | |
422 | /* msg header takes up space in the buffer */ | |
423 | smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); | |
424 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); | |
425 | smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; | |
426 | } | |
427 | ||
428 | static void smc_conn_save_peer_info(struct smc_sock *smc, | |
429 | struct smc_clc_msg_accept_confirm *clc) | |
430 | { | |
431 | if (smc->conn.lgr->is_smcd) | |
432 | smcd_conn_save_peer_info(smc, clc); | |
433 | else | |
434 | smcr_conn_save_peer_info(smc, clc); | |
435 | } | |
436 | ||
0cfdd8f9 UB |
437 | static void smc_link_save_peer_info(struct smc_link *link, |
438 | struct smc_clc_msg_accept_confirm *clc) | |
439 | { | |
440 | link->peer_qpn = ntoh24(clc->qpn); | |
441 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
442 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
443 | link->peer_psn = ntoh24(clc->psn); | |
444 | link->peer_mtu = clc->qp_mtu; | |
445 | } | |
446 | ||
3b2dec26 | 447 | /* fall back during connect */ |
603cc149 | 448 | static int smc_connect_fallback(struct smc_sock *smc, int reason_code) |
a046d57d | 449 | { |
3b2dec26 | 450 | smc->use_fallback = true; |
603cc149 | 451 | smc->fallback_rsn = reason_code; |
3b2dec26 | 452 | smc_copy_sock_settings_to_clc(smc); |
50717a37 | 453 | smc->connect_nonblock = 0; |
3b2dec26 HW |
454 | if (smc->sk.sk_state == SMC_INIT) |
455 | smc->sk.sk_state = SMC_ACTIVE; | |
456 | return 0; | |
457 | } | |
51f1de79 | 458 | |
3b2dec26 HW |
459 | /* decline and fall back during connect */ |
460 | static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code) | |
461 | { | |
462 | int rc; | |
ee9dfbef | 463 | |
e1bbdd57 UB |
464 | if (reason_code < 0) { /* error, fallback is not possible */ |
465 | if (smc->sk.sk_state == SMC_INIT) | |
466 | sock_put(&smc->sk); /* passive closing */ | |
3b2dec26 | 467 | return reason_code; |
e1bbdd57 | 468 | } |
603cc149 | 469 | if (reason_code != SMC_CLC_DECL_PEERDECL) { |
3b2dec26 | 470 | rc = smc_clc_send_decline(smc, reason_code); |
e1bbdd57 UB |
471 | if (rc < 0) { |
472 | if (smc->sk.sk_state == SMC_INIT) | |
473 | sock_put(&smc->sk); /* passive closing */ | |
3b2dec26 | 474 | return rc; |
e1bbdd57 | 475 | } |
c5c1cc9c | 476 | } |
603cc149 | 477 | return smc_connect_fallback(smc, reason_code); |
3b2dec26 | 478 | } |
c5c1cc9c | 479 | |
3b2dec26 HW |
480 | /* abort connecting */ |
481 | static int smc_connect_abort(struct smc_sock *smc, int reason_code, | |
482 | int local_contact) | |
483 | { | |
484 | if (local_contact == SMC_FIRST_CONTACT) | |
485 | smc_lgr_forget(smc->conn.lgr); | |
72a36a8a HW |
486 | if (smc->conn.lgr->is_smcd) |
487 | /* there is only one lgr role for SMC-D; use server lock */ | |
488 | mutex_unlock(&smc_server_lgr_pending); | |
489 | else | |
490 | mutex_unlock(&smc_client_lgr_pending); | |
491 | ||
3b2dec26 | 492 | smc_conn_free(&smc->conn); |
50717a37 | 493 | smc->connect_nonblock = 0; |
3b2dec26 HW |
494 | return reason_code; |
495 | } | |
496 | ||
497 | /* check if there is a rdma device available for this connection. */ | |
498 | /* called for connect and listen */ | |
bc36d2fc | 499 | static int smc_check_rdma(struct smc_sock *smc, struct smc_init_info *ini) |
3b2dec26 | 500 | { |
a046d57d UB |
501 | /* PNET table look up: search active ib_device and port |
502 | * within same PNETID that also contains the ethernet device | |
503 | * used for the internal TCP socket | |
504 | */ | |
bc36d2fc KG |
505 | smc_pnet_find_roce_resource(smc->clcsock->sk, ini); |
506 | if (!(ini->ib_dev)) | |
507 | return SMC_CLC_DECL_CNFERR; /* configuration error */ | |
508 | return 0; | |
3b2dec26 HW |
509 | } |
510 | ||
41349844 HW |
511 | /* check if there is an ISM device available for this connection. */ |
512 | /* called for connect and listen */ | |
bc36d2fc | 513 | static int smc_check_ism(struct smc_sock *smc, struct smc_init_info *ini) |
41349844 HW |
514 | { |
515 | /* Find ISM device with same PNETID as connecting interface */ | |
bc36d2fc KG |
516 | smc_pnet_find_ism_resource(smc->clcsock->sk, ini); |
517 | if (!ini->ism_dev) | |
41349844 HW |
518 | return SMC_CLC_DECL_CNFERR; /* configuration error */ |
519 | return 0; | |
520 | } | |
521 | ||
522 | /* Check for VLAN ID and register it on ISM device just for CLC handshake */ | |
523 | static int smc_connect_ism_vlan_setup(struct smc_sock *smc, | |
bc36d2fc | 524 | struct smc_init_info *ini) |
41349844 | 525 | { |
bc36d2fc | 526 | if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) |
41349844 HW |
527 | return SMC_CLC_DECL_CNFERR; |
528 | return 0; | |
529 | } | |
530 | ||
531 | /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is | |
532 | * used, the VLAN ID will be registered again during the connection setup. | |
533 | */ | |
534 | static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd, | |
bc36d2fc | 535 | struct smc_init_info *ini) |
41349844 HW |
536 | { |
537 | if (!is_smcd) | |
538 | return 0; | |
bc36d2fc | 539 | if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev, ini->vlan_id)) |
41349844 HW |
540 | return SMC_CLC_DECL_CNFERR; |
541 | return 0; | |
542 | } | |
543 | ||
3b2dec26 | 544 | /* CLC handshake during connect */ |
c758dfdd | 545 | static int smc_connect_clc(struct smc_sock *smc, int smc_type, |
3b2dec26 | 546 | struct smc_clc_msg_accept_confirm *aclc, |
bc36d2fc | 547 | struct smc_init_info *ini) |
3b2dec26 HW |
548 | { |
549 | int rc = 0; | |
a046d57d UB |
550 | |
551 | /* do inband token exchange */ | |
bc36d2fc | 552 | rc = smc_clc_send_proposal(smc, smc_type, ini); |
3b2dec26 HW |
553 | if (rc) |
554 | return rc; | |
a046d57d | 555 | /* receive SMC Accept CLC message */ |
2b59f58e UB |
556 | return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT, |
557 | CLC_WAIT_TIME); | |
3b2dec26 HW |
558 | } |
559 | ||
560 | /* setup for RDMA connection of client */ | |
561 | static int smc_connect_rdma(struct smc_sock *smc, | |
562 | struct smc_clc_msg_accept_confirm *aclc, | |
bc36d2fc | 563 | struct smc_init_info *ini) |
3b2dec26 HW |
564 | { |
565 | int local_contact = SMC_FIRST_CONTACT; | |
566 | struct smc_link *link; | |
567 | int reason_code = 0; | |
a046d57d | 568 | |
bc36d2fc KG |
569 | ini->is_smcd = false; |
570 | ini->ib_lcl = &aclc->lcl; | |
571 | ini->ib_clcqpn = ntoh24(aclc->qpn); | |
572 | ini->srv_first_contact = aclc->hdr.flag; | |
573 | ||
72a36a8a | 574 | mutex_lock(&smc_client_lgr_pending); |
bc36d2fc | 575 | local_contact = smc_conn_create(smc, ini); |
0cfdd8f9 | 576 | if (local_contact < 0) { |
3b2dec26 | 577 | if (local_contact == -ENOMEM) |
0cfdd8f9 | 578 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ |
3b2dec26 | 579 | else if (local_contact == -ENOLINK) |
0cfdd8f9 | 580 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ |
1401ea04 KG |
581 | else |
582 | reason_code = SMC_CLC_DECL_INTERR; /* other error */ | |
72a36a8a HW |
583 | mutex_unlock(&smc_client_lgr_pending); |
584 | return reason_code; | |
0cfdd8f9 UB |
585 | } |
586 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 587 | |
3b2dec26 | 588 | smc_conn_save_peer_info(smc, aclc); |
cd6851f3 | 589 | |
3e034725 | 590 | /* create send buffer and rmb */ |
c6ba7c9b | 591 | if (smc_buf_create(smc, false)) |
3b2dec26 | 592 | return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); |
cd6851f3 | 593 | |
0cfdd8f9 | 594 | if (local_contact == SMC_FIRST_CONTACT) |
3b2dec26 | 595 | smc_link_save_peer_info(link, aclc); |
bd4ad577 | 596 | |
3b2dec26 | 597 | if (smc_rmb_rtoken_handling(&smc->conn, aclc)) |
603cc149 | 598 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK, |
3b2dec26 | 599 | local_contact); |
bd4ad577 | 600 | |
46c28dbd UB |
601 | smc_close_init(smc); |
602 | smc_rx_init(smc); | |
603 | ||
bd4ad577 | 604 | if (local_contact == SMC_FIRST_CONTACT) { |
3b2dec26 | 605 | if (smc_ib_ready_link(link)) |
603cc149 | 606 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK, |
3b2dec26 | 607 | local_contact); |
652a1e41 | 608 | } else { |
c7674c00 | 609 | if (smc_reg_rmb(link, smc->conn.rmb_desc, true)) |
603cc149 | 610 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB, |
3b2dec26 | 611 | local_contact); |
bd4ad577 | 612 | } |
10428dd8 | 613 | smc_rmb_sync_sg_for_device(&smc->conn); |
a046d57d | 614 | |
3b2dec26 HW |
615 | reason_code = smc_clc_send_confirm(smc); |
616 | if (reason_code) | |
617 | return smc_connect_abort(smc, reason_code, local_contact); | |
618 | ||
619 | smc_tx_init(smc); | |
a046d57d | 620 | |
9bf9abea UB |
621 | if (local_contact == SMC_FIRST_CONTACT) { |
622 | /* QP confirmation over RoCE fabric */ | |
0f627126 | 623 | reason_code = smc_clnt_conf_first_link(smc); |
3b2dec26 HW |
624 | if (reason_code) |
625 | return smc_connect_abort(smc, reason_code, | |
626 | local_contact); | |
9bf9abea | 627 | } |
72a36a8a | 628 | mutex_unlock(&smc_client_lgr_pending); |
e6727f39 | 629 | |
a046d57d | 630 | smc_copy_sock_settings_to_clc(smc); |
50717a37 | 631 | smc->connect_nonblock = 0; |
b38d7324 UB |
632 | if (smc->sk.sk_state == SMC_INIT) |
633 | smc->sk.sk_state = SMC_ACTIVE; | |
a046d57d | 634 | |
3b2dec26 HW |
635 | return 0; |
636 | } | |
a046d57d | 637 | |
41349844 HW |
638 | /* setup for ISM connection of client */ |
639 | static int smc_connect_ism(struct smc_sock *smc, | |
640 | struct smc_clc_msg_accept_confirm *aclc, | |
bc36d2fc | 641 | struct smc_init_info *ini) |
41349844 HW |
642 | { |
643 | int local_contact = SMC_FIRST_CONTACT; | |
644 | int rc = 0; | |
645 | ||
bc36d2fc KG |
646 | ini->is_smcd = true; |
647 | ini->ism_gid = aclc->gid; | |
648 | ini->srv_first_contact = aclc->hdr.flag; | |
649 | ||
72a36a8a HW |
650 | /* there is only one lgr role for SMC-D; use server lock */ |
651 | mutex_lock(&smc_server_lgr_pending); | |
bc36d2fc | 652 | local_contact = smc_conn_create(smc, ini); |
72a36a8a HW |
653 | if (local_contact < 0) { |
654 | mutex_unlock(&smc_server_lgr_pending); | |
655 | return SMC_CLC_DECL_MEM; | |
656 | } | |
41349844 HW |
657 | |
658 | /* Create send and receive buffers */ | |
659 | if (smc_buf_create(smc, true)) | |
660 | return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); | |
661 | ||
662 | smc_conn_save_peer_info(smc, aclc); | |
663 | smc_close_init(smc); | |
664 | smc_rx_init(smc); | |
665 | smc_tx_init(smc); | |
666 | ||
667 | rc = smc_clc_send_confirm(smc); | |
668 | if (rc) | |
669 | return smc_connect_abort(smc, rc, local_contact); | |
72a36a8a | 670 | mutex_unlock(&smc_server_lgr_pending); |
41349844 HW |
671 | |
672 | smc_copy_sock_settings_to_clc(smc); | |
50717a37 | 673 | smc->connect_nonblock = 0; |
41349844 HW |
674 | if (smc->sk.sk_state == SMC_INIT) |
675 | smc->sk.sk_state = SMC_ACTIVE; | |
676 | ||
677 | return 0; | |
678 | } | |
679 | ||
3b2dec26 HW |
680 | /* perform steps before actually connecting */ |
681 | static int __smc_connect(struct smc_sock *smc) | |
682 | { | |
41349844 | 683 | bool ism_supported = false, rdma_supported = false; |
3b2dec26 | 684 | struct smc_clc_msg_accept_confirm aclc; |
bc36d2fc | 685 | struct smc_init_info ini = {0}; |
41349844 | 686 | int smc_type; |
3b2dec26 | 687 | int rc = 0; |
a046d57d | 688 | |
3b2dec26 HW |
689 | sock_hold(&smc->sk); /* sock put in passive closing */ |
690 | ||
691 | if (smc->use_fallback) | |
603cc149 | 692 | return smc_connect_fallback(smc, smc->fallback_rsn); |
3b2dec26 HW |
693 | |
694 | /* if peer has not signalled SMC-capability, fall back */ | |
695 | if (!tcp_sk(smc->clcsock->sk)->syn_smc) | |
603cc149 | 696 | return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); |
3b2dec26 HW |
697 | |
698 | /* IPSec connections opt out of SMC-R optimizations */ | |
699 | if (using_ipsec(smc)) | |
700 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); | |
701 | ||
41349844 | 702 | /* check for VLAN ID */ |
bc36d2fc | 703 | if (smc_vlan_by_tcpsk(smc->clcsock, &ini)) |
41349844 HW |
704 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR); |
705 | ||
706 | /* check if there is an ism device available */ | |
bc36d2fc KG |
707 | if (!smc_check_ism(smc, &ini) && |
708 | !smc_connect_ism_vlan_setup(smc, &ini)) { | |
41349844 HW |
709 | /* ISM is supported for this connection */ |
710 | ism_supported = true; | |
711 | smc_type = SMC_TYPE_D; | |
712 | } | |
713 | ||
714 | /* check if there is a rdma device available */ | |
bc36d2fc | 715 | if (!smc_check_rdma(smc, &ini)) { |
41349844 HW |
716 | /* RDMA is supported for this connection */ |
717 | rdma_supported = true; | |
718 | if (ism_supported) | |
719 | smc_type = SMC_TYPE_B; /* both */ | |
720 | else | |
721 | smc_type = SMC_TYPE_R; /* only RDMA */ | |
722 | } | |
723 | ||
724 | /* if neither ISM nor RDMA are supported, fallback */ | |
725 | if (!rdma_supported && !ism_supported) | |
603cc149 | 726 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV); |
3b2dec26 HW |
727 | |
728 | /* perform CLC handshake */ | |
bc36d2fc | 729 | rc = smc_connect_clc(smc, smc_type, &aclc, &ini); |
41349844 | 730 | if (rc) { |
bc36d2fc | 731 | smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
3b2dec26 | 732 | return smc_connect_decline_fallback(smc, rc); |
41349844 | 733 | } |
3b2dec26 | 734 | |
41349844 HW |
735 | /* depending on previous steps, connect using rdma or ism */ |
736 | if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) | |
bc36d2fc | 737 | rc = smc_connect_rdma(smc, &aclc, &ini); |
41349844 | 738 | else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) |
bc36d2fc | 739 | rc = smc_connect_ism(smc, &aclc, &ini); |
41349844 | 740 | else |
603cc149 | 741 | rc = SMC_CLC_DECL_MODEUNSUPP; |
41349844 | 742 | if (rc) { |
bc36d2fc | 743 | smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
3b2dec26 | 744 | return smc_connect_decline_fallback(smc, rc); |
41349844 | 745 | } |
3b2dec26 | 746 | |
bc36d2fc | 747 | smc_connect_ism_vlan_cleanup(smc, ism_supported, &ini); |
3b2dec26 | 748 | return 0; |
a046d57d UB |
749 | } |
750 | ||
24ac3a08 UB |
751 | static void smc_connect_work(struct work_struct *work) |
752 | { | |
753 | struct smc_sock *smc = container_of(work, struct smc_sock, | |
754 | connect_work); | |
50717a37 UB |
755 | long timeo = smc->sk.sk_sndtimeo; |
756 | int rc = 0; | |
24ac3a08 | 757 | |
50717a37 UB |
758 | if (!timeo) |
759 | timeo = MAX_SCHEDULE_TIMEOUT; | |
760 | lock_sock(smc->clcsock->sk); | |
24ac3a08 UB |
761 | if (smc->clcsock->sk->sk_err) { |
762 | smc->sk.sk_err = smc->clcsock->sk->sk_err; | |
50717a37 UB |
763 | } else if ((1 << smc->clcsock->sk->sk_state) & |
764 | (TCPF_SYN_SENT | TCP_SYN_RECV)) { | |
765 | rc = sk_stream_wait_connect(smc->clcsock->sk, &timeo); | |
766 | if ((rc == -EPIPE) && | |
767 | ((1 << smc->clcsock->sk->sk_state) & | |
768 | (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT))) | |
769 | rc = 0; | |
24ac3a08 | 770 | } |
50717a37 UB |
771 | release_sock(smc->clcsock->sk); |
772 | lock_sock(&smc->sk); | |
773 | if (rc != 0 || smc->sk.sk_err) { | |
774 | smc->sk.sk_state = SMC_CLOSED; | |
775 | if (rc == -EPIPE || rc == -EAGAIN) | |
776 | smc->sk.sk_err = EPIPE; | |
777 | else if (signal_pending(current)) | |
778 | smc->sk.sk_err = -sock_intr_errno(timeo); | |
24ac3a08 UB |
779 | goto out; |
780 | } | |
781 | ||
782 | rc = __smc_connect(smc); | |
783 | if (rc < 0) | |
784 | smc->sk.sk_err = -rc; | |
785 | ||
786 | out: | |
648a5a7a UB |
787 | if (smc->sk.sk_err) |
788 | smc->sk.sk_state_change(&smc->sk); | |
789 | else | |
790 | smc->sk.sk_write_space(&smc->sk); | |
24ac3a08 UB |
791 | release_sock(&smc->sk); |
792 | } | |
793 | ||
ac713874 UB |
794 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
795 | int alen, int flags) | |
796 | { | |
797 | struct sock *sk = sock->sk; | |
798 | struct smc_sock *smc; | |
799 | int rc = -EINVAL; | |
800 | ||
801 | smc = smc_sk(sk); | |
802 | ||
803 | /* separate smc parameter checking to be safe */ | |
804 | if (alen < sizeof(addr->sa_family)) | |
805 | goto out_err; | |
aaa4d33f | 806 | if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) |
ac713874 UB |
807 | goto out_err; |
808 | ||
809 | lock_sock(sk); | |
810 | switch (sk->sk_state) { | |
811 | default: | |
812 | goto out; | |
813 | case SMC_ACTIVE: | |
814 | rc = -EISCONN; | |
815 | goto out; | |
816 | case SMC_INIT: | |
817 | rc = 0; | |
818 | break; | |
819 | } | |
820 | ||
821 | smc_copy_sock_settings_to_clc(smc); | |
c5c1cc9c | 822 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; |
50717a37 UB |
823 | if (smc->connect_nonblock) { |
824 | rc = -EALREADY; | |
825 | goto out; | |
826 | } | |
827 | rc = kernel_connect(smc->clcsock, addr, alen, flags); | |
828 | if (rc && rc != -EINPROGRESS) | |
829 | goto out; | |
24ac3a08 | 830 | if (flags & O_NONBLOCK) { |
50717a37 UB |
831 | if (schedule_work(&smc->connect_work)) |
832 | smc->connect_nonblock = 1; | |
24ac3a08 UB |
833 | rc = -EINPROGRESS; |
834 | } else { | |
24ac3a08 UB |
835 | rc = __smc_connect(smc); |
836 | if (rc < 0) | |
837 | goto out; | |
838 | else | |
839 | rc = 0; /* success cases including fallback */ | |
840 | } | |
ac713874 UB |
841 | |
842 | out: | |
843 | release_sock(sk); | |
844 | out_err: | |
845 | return rc; | |
846 | } | |
847 | ||
848 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
849 | { | |
3163c507 UB |
850 | struct socket *new_clcsock = NULL; |
851 | struct sock *lsk = &lsmc->sk; | |
ac713874 | 852 | struct sock *new_sk; |
78abe3d0 | 853 | int rc = -EINVAL; |
ac713874 | 854 | |
3163c507 | 855 | release_sock(lsk); |
aaa4d33f | 856 | new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); |
ac713874 UB |
857 | if (!new_sk) { |
858 | rc = -ENOMEM; | |
3163c507 | 859 | lsk->sk_err = ENOMEM; |
ac713874 | 860 | *new_smc = NULL; |
3163c507 | 861 | lock_sock(lsk); |
ac713874 UB |
862 | goto out; |
863 | } | |
864 | *new_smc = smc_sk(new_sk); | |
865 | ||
78abe3d0 MJ |
866 | mutex_lock(&lsmc->clcsock_release_lock); |
867 | if (lsmc->clcsock) | |
868 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
869 | mutex_unlock(&lsmc->clcsock_release_lock); | |
3163c507 | 870 | lock_sock(lsk); |
35a6b178 | 871 | if (rc < 0) |
3163c507 | 872 | lsk->sk_err = -rc; |
35a6b178 | 873 | if (rc < 0 || lsk->sk_state == SMC_CLOSED) { |
a046d57d UB |
874 | if (new_clcsock) |
875 | sock_release(new_clcsock); | |
876 | new_sk->sk_state = SMC_CLOSED; | |
877 | sock_set_flag(new_sk, SOCK_DEAD); | |
3163c507 | 878 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 879 | sock_put(new_sk); /* final */ |
ac713874 UB |
880 | *new_smc = NULL; |
881 | goto out; | |
882 | } | |
883 | ||
884 | (*new_smc)->clcsock = new_clcsock; | |
885 | out: | |
886 | return rc; | |
887 | } | |
888 | ||
a046d57d UB |
889 | /* add a just created sock to the accept queue of the listen sock as |
890 | * candidate for a following socket accept call from user space | |
891 | */ | |
892 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
893 | { | |
894 | struct smc_sock *par = smc_sk(parent); | |
895 | ||
51f1de79 | 896 | sock_hold(sk); /* sock_put in smc_accept_unlink () */ |
a046d57d UB |
897 | spin_lock(&par->accept_q_lock); |
898 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
899 | spin_unlock(&par->accept_q_lock); | |
900 | sk_acceptq_added(parent); | |
901 | } | |
902 | ||
903 | /* remove a socket from the accept queue of its parental listening socket */ | |
904 | static void smc_accept_unlink(struct sock *sk) | |
905 | { | |
906 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
907 | ||
908 | spin_lock(&par->accept_q_lock); | |
909 | list_del_init(&smc_sk(sk)->accept_q); | |
910 | spin_unlock(&par->accept_q_lock); | |
911 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
51f1de79 | 912 | sock_put(sk); /* sock_hold in smc_accept_enqueue */ |
a046d57d UB |
913 | } |
914 | ||
915 | /* remove a sock from the accept queue to bind it to a new socket created | |
916 | * for a socket accept call from user space | |
917 | */ | |
b38d7324 UB |
918 | struct sock *smc_accept_dequeue(struct sock *parent, |
919 | struct socket *new_sock) | |
a046d57d UB |
920 | { |
921 | struct smc_sock *isk, *n; | |
922 | struct sock *new_sk; | |
923 | ||
924 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
925 | new_sk = (struct sock *)isk; | |
926 | ||
927 | smc_accept_unlink(new_sk); | |
928 | if (new_sk->sk_state == SMC_CLOSED) { | |
127f4970 UB |
929 | if (isk->clcsock) { |
930 | sock_release(isk->clcsock); | |
931 | isk->clcsock = NULL; | |
932 | } | |
288c8390 | 933 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 934 | sock_put(new_sk); /* final */ |
a046d57d UB |
935 | continue; |
936 | } | |
937 | if (new_sock) | |
938 | sock_graft(new_sk, new_sock); | |
939 | return new_sk; | |
940 | } | |
941 | return NULL; | |
942 | } | |
943 | ||
944 | /* clean up for a created but never accepted sock */ | |
b38d7324 | 945 | void smc_close_non_accepted(struct sock *sk) |
a046d57d UB |
946 | { |
947 | struct smc_sock *smc = smc_sk(sk); | |
948 | ||
b38d7324 UB |
949 | lock_sock(sk); |
950 | if (!sk->sk_lingertime) | |
951 | /* wait for peer closing */ | |
952 | sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; | |
51f1de79 | 953 | if (!smc->use_fallback) { |
b38d7324 | 954 | smc_close_active(smc); |
288c8390 UB |
955 | sock_set_flag(sk, SOCK_DEAD); |
956 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
957 | } | |
a046d57d UB |
958 | if (smc->clcsock) { |
959 | struct socket *tcp; | |
960 | ||
961 | tcp = smc->clcsock; | |
962 | smc->clcsock = NULL; | |
963 | sock_release(tcp); | |
964 | } | |
b38d7324 | 965 | if (smc->use_fallback) { |
51f1de79 UB |
966 | sock_put(sk); /* passive closing */ |
967 | sk->sk_state = SMC_CLOSED; | |
968 | } else { | |
969 | if (sk->sk_state == SMC_CLOSED) | |
970 | smc_conn_free(&smc->conn); | |
b38d7324 UB |
971 | } |
972 | release_sock(sk); | |
51f1de79 UB |
973 | sk->sk_prot->unhash(sk); |
974 | sock_put(sk); /* final sock_put */ | |
a046d57d UB |
975 | } |
976 | ||
9bf9abea UB |
977 | static int smc_serv_conf_first_link(struct smc_sock *smc) |
978 | { | |
877ae5be | 979 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
980 | struct smc_link_group *lgr = smc->conn.lgr; |
981 | struct smc_link *link; | |
982 | int rest; | |
983 | int rc; | |
984 | ||
985 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
652a1e41 | 986 | |
44aa81ce | 987 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
603cc149 | 988 | return SMC_CLC_DECL_ERR_REGRMB; |
652a1e41 | 989 | |
9bf9abea | 990 | /* send CONFIRM LINK request to client over the RoCE fabric */ |
947541f3 | 991 | rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); |
9bf9abea | 992 | if (rc < 0) |
603cc149 | 993 | return SMC_CLC_DECL_TIMEOUT_CL; |
9bf9abea UB |
994 | |
995 | /* receive CONFIRM LINK response from client over the RoCE fabric */ | |
996 | rest = wait_for_completion_interruptible_timeout( | |
997 | &link->llc_confirm_resp, | |
998 | SMC_LLC_WAIT_FIRST_TIME); | |
999 | if (rest <= 0) { | |
1000 | struct smc_clc_msg_decline dclc; | |
1001 | ||
1002 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
2b59f58e | 1003 | SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
9ed28556 | 1004 | return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc; |
9bf9abea UB |
1005 | } |
1006 | ||
75d320d6 KG |
1007 | if (link->llc_confirm_resp_rc) |
1008 | return SMC_CLC_DECL_RMBE_EC; | |
1009 | ||
52bedf37 KG |
1010 | /* send ADD LINK request to client over the RoCE fabric */ |
1011 | rc = smc_llc_send_add_link(link, | |
1012 | link->smcibdev->mac[link->ibport - 1], | |
7005ada6 | 1013 | link->gid, SMC_LLC_REQ); |
52bedf37 | 1014 | if (rc < 0) |
603cc149 | 1015 | return SMC_CLC_DECL_TIMEOUT_AL; |
52bedf37 KG |
1016 | |
1017 | /* receive ADD LINK response from client over the RoCE fabric */ | |
1018 | rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, | |
1019 | SMC_LLC_WAIT_TIME); | |
1020 | if (rest <= 0) { | |
1021 | struct smc_clc_msg_decline dclc; | |
1022 | ||
1023 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
2b59f58e | 1024 | SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT); |
9ed28556 | 1025 | return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_AL : rc; |
52bedf37 KG |
1026 | } |
1027 | ||
877ae5be | 1028 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 1029 | |
75d320d6 | 1030 | return 0; |
9bf9abea UB |
1031 | } |
1032 | ||
3b2dec26 HW |
1033 | /* listen worker: finish */ |
1034 | static void smc_listen_out(struct smc_sock *new_smc) | |
a046d57d | 1035 | { |
a046d57d | 1036 | struct smc_sock *lsmc = new_smc->listen_smc; |
a046d57d | 1037 | struct sock *newsmcsk = &new_smc->sk; |
a046d57d | 1038 | |
3b2dec26 HW |
1039 | lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); |
1040 | if (lsmc->sk.sk_state == SMC_LISTEN) { | |
1041 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
1042 | } else { /* no longer listening */ | |
1043 | smc_close_non_accepted(newsmcsk); | |
c5c1cc9c | 1044 | } |
3b2dec26 | 1045 | release_sock(&lsmc->sk); |
c5c1cc9c | 1046 | |
3b2dec26 HW |
1047 | /* Wake up accept */ |
1048 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
1049 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
1050 | } | |
a046d57d | 1051 | |
3b2dec26 HW |
1052 | /* listen worker: finish in state connected */ |
1053 | static void smc_listen_out_connected(struct smc_sock *new_smc) | |
1054 | { | |
1055 | struct sock *newsmcsk = &new_smc->sk; | |
a046d57d | 1056 | |
3b2dec26 HW |
1057 | sk_refcnt_debug_inc(newsmcsk); |
1058 | if (newsmcsk->sk_state == SMC_INIT) | |
1059 | newsmcsk->sk_state = SMC_ACTIVE; | |
1060 | ||
1061 | smc_listen_out(new_smc); | |
1062 | } | |
1063 | ||
1064 | /* listen worker: finish in error state */ | |
1065 | static void smc_listen_out_err(struct smc_sock *new_smc) | |
1066 | { | |
1067 | struct sock *newsmcsk = &new_smc->sk; | |
1068 | ||
1069 | if (newsmcsk->sk_state == SMC_INIT) | |
1070 | sock_put(&new_smc->sk); /* passive closing */ | |
1071 | newsmcsk->sk_state = SMC_CLOSED; | |
1072 | smc_conn_free(&new_smc->conn); | |
1073 | ||
1074 | smc_listen_out(new_smc); | |
1075 | } | |
1076 | ||
1077 | /* listen worker: decline and fall back if possible */ | |
1078 | static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, | |
1079 | int local_contact) | |
1080 | { | |
1081 | /* RDMA setup failed, switch back to TCP */ | |
1082 | if (local_contact == SMC_FIRST_CONTACT) | |
1083 | smc_lgr_forget(new_smc->conn.lgr); | |
1084 | if (reason_code < 0) { /* error, no fallback possible */ | |
1085 | smc_listen_out_err(new_smc); | |
1086 | return; | |
1087 | } | |
1088 | smc_conn_free(&new_smc->conn); | |
1089 | new_smc->use_fallback = true; | |
603cc149 KG |
1090 | new_smc->fallback_rsn = reason_code; |
1091 | if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { | |
3b2dec26 HW |
1092 | if (smc_clc_send_decline(new_smc, reason_code) < 0) { |
1093 | smc_listen_out_err(new_smc); | |
1094 | return; | |
1095 | } | |
a046d57d | 1096 | } |
3b2dec26 HW |
1097 | smc_listen_out_connected(new_smc); |
1098 | } | |
1099 | ||
1100 | /* listen worker: check prefixes */ | |
59886697 | 1101 | static int smc_listen_prfx_check(struct smc_sock *new_smc, |
3b2dec26 HW |
1102 | struct smc_clc_msg_proposal *pclc) |
1103 | { | |
1104 | struct smc_clc_msg_proposal_prefix *pclc_prfx; | |
1105 | struct socket *newclcsock = new_smc->clcsock; | |
a046d57d | 1106 | |
e7b7a64a | 1107 | pclc_prfx = smc_clc_proposal_get_prefix(pclc); |
3b2dec26 | 1108 | if (smc_clc_prfx_match(newclcsock, pclc_prfx)) |
59886697 | 1109 | return SMC_CLC_DECL_DIFFPREFIX; |
c246d942 | 1110 | |
3b2dec26 HW |
1111 | return 0; |
1112 | } | |
a046d57d | 1113 | |
3b2dec26 HW |
1114 | /* listen worker: initialize connection and buffers */ |
1115 | static int smc_listen_rdma_init(struct smc_sock *new_smc, | |
bc36d2fc | 1116 | struct smc_init_info *ini, int *local_contact) |
3b2dec26 | 1117 | { |
0cfdd8f9 | 1118 | /* allocate connection / link group */ |
bc36d2fc | 1119 | *local_contact = smc_conn_create(new_smc, ini); |
3b2dec26 HW |
1120 | if (*local_contact < 0) { |
1121 | if (*local_contact == -ENOMEM) | |
1122 | return SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
1123 | return SMC_CLC_DECL_INTERR; /* other error */ | |
0cfdd8f9 | 1124 | } |
a046d57d | 1125 | |
3e034725 | 1126 | /* create send buffer and rmb */ |
c6ba7c9b | 1127 | if (smc_buf_create(new_smc, false)) |
3b2dec26 | 1128 | return SMC_CLC_DECL_MEM; |
a046d57d | 1129 | |
3b2dec26 HW |
1130 | return 0; |
1131 | } | |
1132 | ||
41349844 HW |
1133 | /* listen worker: initialize connection and buffers for SMC-D */ |
1134 | static int smc_listen_ism_init(struct smc_sock *new_smc, | |
1135 | struct smc_clc_msg_proposal *pclc, | |
bc36d2fc | 1136 | struct smc_init_info *ini, |
41349844 HW |
1137 | int *local_contact) |
1138 | { | |
1139 | struct smc_clc_msg_smcd *pclc_smcd; | |
1140 | ||
1141 | pclc_smcd = smc_get_clc_msg_smcd(pclc); | |
bc36d2fc KG |
1142 | ini->ism_gid = pclc_smcd->gid; |
1143 | *local_contact = smc_conn_create(new_smc, ini); | |
41349844 HW |
1144 | if (*local_contact < 0) { |
1145 | if (*local_contact == -ENOMEM) | |
1146 | return SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
1147 | return SMC_CLC_DECL_INTERR; /* other error */ | |
1148 | } | |
1149 | ||
1150 | /* Check if peer can be reached via ISM device */ | |
1151 | if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, | |
1152 | new_smc->conn.lgr->vlan_id, | |
1153 | new_smc->conn.lgr->smcd)) { | |
1154 | if (*local_contact == SMC_FIRST_CONTACT) | |
1155 | smc_lgr_forget(new_smc->conn.lgr); | |
1156 | smc_conn_free(&new_smc->conn); | |
1157 | return SMC_CLC_DECL_CNFERR; | |
1158 | } | |
1159 | ||
1160 | /* Create send and receive buffers */ | |
1161 | if (smc_buf_create(new_smc, true)) { | |
1162 | if (*local_contact == SMC_FIRST_CONTACT) | |
1163 | smc_lgr_forget(new_smc->conn.lgr); | |
1164 | smc_conn_free(&new_smc->conn); | |
1165 | return SMC_CLC_DECL_MEM; | |
1166 | } | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
3b2dec26 HW |
1171 | /* listen worker: register buffers */ |
1172 | static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) | |
1173 | { | |
1174 | struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
46c28dbd | 1175 | |
652a1e41 | 1176 | if (local_contact != SMC_FIRST_CONTACT) { |
c7674c00 KG |
1177 | if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) |
1178 | return SMC_CLC_DECL_ERR_REGRMB; | |
652a1e41 | 1179 | } |
10428dd8 | 1180 | smc_rmb_sync_sg_for_device(&new_smc->conn); |
652a1e41 | 1181 | |
3b2dec26 HW |
1182 | return 0; |
1183 | } | |
1184 | ||
1185 | /* listen worker: finish RDMA setup */ | |
1ca52fcf UB |
1186 | static int smc_listen_rdma_finish(struct smc_sock *new_smc, |
1187 | struct smc_clc_msg_accept_confirm *cclc, | |
1188 | int local_contact) | |
3b2dec26 HW |
1189 | { |
1190 | struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
1191 | int reason_code = 0; | |
a046d57d | 1192 | |
0cfdd8f9 | 1193 | if (local_contact == SMC_FIRST_CONTACT) |
3b2dec26 | 1194 | smc_link_save_peer_info(link, cclc); |
a046d57d | 1195 | |
3b2dec26 | 1196 | if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { |
603cc149 | 1197 | reason_code = SMC_CLC_DECL_ERR_RTOK; |
3b2dec26 | 1198 | goto decline; |
bd4ad577 UB |
1199 | } |
1200 | ||
bd4ad577 | 1201 | if (local_contact == SMC_FIRST_CONTACT) { |
3b2dec26 | 1202 | if (smc_ib_ready_link(link)) { |
603cc149 | 1203 | reason_code = SMC_CLC_DECL_ERR_RDYLNK; |
3b2dec26 | 1204 | goto decline; |
bd4ad577 | 1205 | } |
9bf9abea UB |
1206 | /* QP confirmation over RoCE fabric */ |
1207 | reason_code = smc_serv_conf_first_link(new_smc); | |
3b2dec26 HW |
1208 | if (reason_code) |
1209 | goto decline; | |
bd4ad577 | 1210 | } |
1ca52fcf | 1211 | return 0; |
a046d57d | 1212 | |
3b2dec26 | 1213 | decline: |
3b2dec26 | 1214 | smc_listen_decline(new_smc, reason_code, local_contact); |
1ca52fcf | 1215 | return reason_code; |
3b2dec26 | 1216 | } |
e6727f39 | 1217 | |
3b2dec26 HW |
1218 | /* setup for RDMA connection of server */ |
1219 | static void smc_listen_work(struct work_struct *work) | |
1220 | { | |
1221 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
1222 | smc_listen_work); | |
1223 | struct socket *newclcsock = new_smc->clcsock; | |
1224 | struct smc_clc_msg_accept_confirm cclc; | |
1225 | struct smc_clc_msg_proposal *pclc; | |
bc36d2fc | 1226 | struct smc_init_info ini = {0}; |
41349844 | 1227 | bool ism_supported = false; |
3b2dec26 HW |
1228 | u8 buf[SMC_CLC_MAX_LEN]; |
1229 | int local_contact = 0; | |
1230 | int reason_code = 0; | |
1231 | int rc = 0; | |
3b2dec26 HW |
1232 | |
1233 | if (new_smc->use_fallback) { | |
1234 | smc_listen_out_connected(new_smc); | |
1235 | return; | |
a046d57d | 1236 | } |
a046d57d | 1237 | |
3b2dec26 HW |
1238 | /* check if peer is smc capable */ |
1239 | if (!tcp_sk(newclcsock->sk)->syn_smc) { | |
1240 | new_smc->use_fallback = true; | |
603cc149 | 1241 | new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; |
3b2dec26 HW |
1242 | smc_listen_out_connected(new_smc); |
1243 | return; | |
1244 | } | |
a046d57d | 1245 | |
3b2dec26 HW |
1246 | /* do inband token exchange - |
1247 | * wait for and receive SMC Proposal CLC message | |
1248 | */ | |
1249 | pclc = (struct smc_clc_msg_proposal *)&buf; | |
1250 | reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, | |
2b59f58e | 1251 | SMC_CLC_PROPOSAL, CLC_WAIT_TIME); |
3b2dec26 HW |
1252 | if (reason_code) { |
1253 | smc_listen_decline(new_smc, reason_code, 0); | |
1254 | return; | |
a046d57d | 1255 | } |
a046d57d | 1256 | |
3b2dec26 HW |
1257 | /* IPSec connections opt out of SMC-R optimizations */ |
1258 | if (using_ipsec(new_smc)) { | |
1259 | smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0); | |
1260 | return; | |
1261 | } | |
1262 | ||
59886697 KG |
1263 | /* check for matching IP prefix and subnet length */ |
1264 | rc = smc_listen_prfx_check(new_smc, pclc); | |
1265 | if (rc) { | |
1266 | smc_listen_decline(new_smc, rc, 0); | |
1267 | return; | |
1268 | } | |
1269 | ||
72a36a8a | 1270 | mutex_lock(&smc_server_lgr_pending); |
3b2dec26 HW |
1271 | smc_close_init(new_smc); |
1272 | smc_rx_init(new_smc); | |
1273 | smc_tx_init(new_smc); | |
1274 | ||
bc36d2fc KG |
1275 | /* prepare ISM check */ |
1276 | ini.is_smcd = true; | |
41349844 HW |
1277 | /* check if ISM is available */ |
1278 | if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) && | |
bc36d2fc KG |
1279 | !smc_check_ism(new_smc, &ini) && |
1280 | !smc_listen_ism_init(new_smc, pclc, &ini, &local_contact)) { | |
41349844 | 1281 | ism_supported = true; |
bc36d2fc KG |
1282 | } else { |
1283 | /* prepare RDMA check */ | |
1284 | memset(&ini, 0, sizeof(ini)); | |
1285 | ini.is_smcd = false; | |
1286 | ini.ib_lcl = &pclc->lcl; | |
41349844 HW |
1287 | } |
1288 | ||
3b2dec26 | 1289 | /* check if RDMA is available */ |
41349844 HW |
1290 | if (!ism_supported && |
1291 | ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) || | |
bc36d2fc KG |
1292 | smc_vlan_by_tcpsk(new_smc->clcsock, &ini) || |
1293 | smc_check_rdma(new_smc, &ini) || | |
1294 | smc_listen_rdma_init(new_smc, &ini, &local_contact) || | |
41349844 | 1295 | smc_listen_rdma_reg(new_smc, local_contact))) { |
3b2dec26 | 1296 | /* SMC not supported, decline */ |
72a36a8a | 1297 | mutex_unlock(&smc_server_lgr_pending); |
603cc149 KG |
1298 | smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP, |
1299 | local_contact); | |
3b2dec26 HW |
1300 | return; |
1301 | } | |
1302 | ||
1303 | /* send SMC Accept CLC message */ | |
1304 | rc = smc_clc_send_accept(new_smc, local_contact); | |
1305 | if (rc) { | |
72a36a8a | 1306 | mutex_unlock(&smc_server_lgr_pending); |
3b2dec26 HW |
1307 | smc_listen_decline(new_smc, rc, local_contact); |
1308 | return; | |
1309 | } | |
1310 | ||
62c7139f HW |
1311 | /* SMC-D does not need this lock any more */ |
1312 | if (ism_supported) | |
72a36a8a | 1313 | mutex_unlock(&smc_server_lgr_pending); |
62c7139f | 1314 | |
3b2dec26 HW |
1315 | /* receive SMC Confirm CLC message */ |
1316 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
2b59f58e | 1317 | SMC_CLC_CONFIRM, CLC_WAIT_TIME); |
3b2dec26 | 1318 | if (reason_code) { |
62c7139f | 1319 | if (!ism_supported) |
72a36a8a | 1320 | mutex_unlock(&smc_server_lgr_pending); |
3b2dec26 HW |
1321 | smc_listen_decline(new_smc, reason_code, local_contact); |
1322 | return; | |
1323 | } | |
1324 | ||
1325 | /* finish worker */ | |
1ca52fcf | 1326 | if (!ism_supported) { |
62c7139f | 1327 | rc = smc_listen_rdma_finish(new_smc, &cclc, local_contact); |
72a36a8a | 1328 | mutex_unlock(&smc_server_lgr_pending); |
62c7139f | 1329 | if (rc) |
1ca52fcf UB |
1330 | return; |
1331 | } | |
3b2dec26 | 1332 | smc_conn_save_peer_info(new_smc, &cclc); |
3b2dec26 | 1333 | smc_listen_out_connected(new_smc); |
a046d57d UB |
1334 | } |
1335 | ||
1336 | static void smc_tcp_listen_work(struct work_struct *work) | |
1337 | { | |
1338 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
1339 | tcp_listen_work); | |
3163c507 | 1340 | struct sock *lsk = &lsmc->sk; |
a046d57d UB |
1341 | struct smc_sock *new_smc; |
1342 | int rc = 0; | |
1343 | ||
3163c507 UB |
1344 | lock_sock(lsk); |
1345 | while (lsk->sk_state == SMC_LISTEN) { | |
a046d57d UB |
1346 | rc = smc_clcsock_accept(lsmc, &new_smc); |
1347 | if (rc) | |
1348 | goto out; | |
1349 | if (!new_smc) | |
1350 | continue; | |
1351 | ||
1352 | new_smc->listen_smc = lsmc; | |
ee9dfbef | 1353 | new_smc->use_fallback = lsmc->use_fallback; |
603cc149 | 1354 | new_smc->fallback_rsn = lsmc->fallback_rsn; |
3163c507 | 1355 | sock_hold(lsk); /* sock_put in smc_listen_work */ |
a046d57d UB |
1356 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); |
1357 | smc_copy_sock_settings_to_smc(new_smc); | |
bd58c7e0 UB |
1358 | new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; |
1359 | new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; | |
51f1de79 UB |
1360 | sock_hold(&new_smc->sk); /* sock_put in passive closing */ |
1361 | if (!schedule_work(&new_smc->smc_listen_work)) | |
1362 | sock_put(&new_smc->sk); | |
a046d57d UB |
1363 | } |
1364 | ||
1365 | out: | |
3163c507 | 1366 | release_sock(lsk); |
51f1de79 | 1367 | sock_put(&lsmc->sk); /* sock_hold in smc_listen */ |
a046d57d UB |
1368 | } |
1369 | ||
ac713874 UB |
1370 | static int smc_listen(struct socket *sock, int backlog) |
1371 | { | |
1372 | struct sock *sk = sock->sk; | |
1373 | struct smc_sock *smc; | |
1374 | int rc; | |
1375 | ||
1376 | smc = smc_sk(sk); | |
1377 | lock_sock(sk); | |
1378 | ||
1379 | rc = -EINVAL; | |
1380 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
1381 | goto out; | |
1382 | ||
1383 | rc = 0; | |
1384 | if (sk->sk_state == SMC_LISTEN) { | |
1385 | sk->sk_max_ack_backlog = backlog; | |
1386 | goto out; | |
1387 | } | |
1388 | /* some socket options are handled in core, so we could not apply | |
1389 | * them to the clc socket -- copy smc socket options to clc socket | |
1390 | */ | |
1391 | smc_copy_sock_settings_to_clc(smc); | |
ee9dfbef UB |
1392 | if (!smc->use_fallback) |
1393 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; | |
ac713874 UB |
1394 | |
1395 | rc = kernel_listen(smc->clcsock, backlog); | |
1396 | if (rc) | |
1397 | goto out; | |
1398 | sk->sk_max_ack_backlog = backlog; | |
1399 | sk->sk_ack_backlog = 0; | |
1400 | sk->sk_state = SMC_LISTEN; | |
51f1de79 UB |
1401 | sock_hold(sk); /* sock_hold in tcp_listen_worker */ |
1402 | if (!schedule_work(&smc->tcp_listen_work)) | |
1403 | sock_put(sk); | |
ac713874 UB |
1404 | |
1405 | out: | |
1406 | release_sock(sk); | |
1407 | return rc; | |
1408 | } | |
1409 | ||
1410 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
cdfbabfb | 1411 | int flags, bool kern) |
ac713874 | 1412 | { |
a046d57d UB |
1413 | struct sock *sk = sock->sk, *nsk; |
1414 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 1415 | struct smc_sock *lsmc; |
a046d57d UB |
1416 | long timeo; |
1417 | int rc = 0; | |
ac713874 UB |
1418 | |
1419 | lsmc = smc_sk(sk); | |
51f1de79 | 1420 | sock_hold(sk); /* sock_put below */ |
ac713874 UB |
1421 | lock_sock(sk); |
1422 | ||
1423 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
1424 | rc = -EINVAL; | |
abb190f1 | 1425 | release_sock(sk); |
ac713874 UB |
1426 | goto out; |
1427 | } | |
1428 | ||
a046d57d UB |
1429 | /* Wait for an incoming connection */ |
1430 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1431 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
1432 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
1433 | set_current_state(TASK_INTERRUPTIBLE); | |
1434 | if (!timeo) { | |
1435 | rc = -EAGAIN; | |
1436 | break; | |
1437 | } | |
1438 | release_sock(sk); | |
1439 | timeo = schedule_timeout(timeo); | |
1440 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
1441 | sched_annotate_sleep(); | |
1442 | lock_sock(sk); | |
1443 | if (signal_pending(current)) { | |
1444 | rc = sock_intr_errno(timeo); | |
1445 | break; | |
1446 | } | |
1447 | } | |
1448 | set_current_state(TASK_RUNNING); | |
1449 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 1450 | |
a046d57d UB |
1451 | if (!rc) |
1452 | rc = sock_error(nsk); | |
abb190f1 UB |
1453 | release_sock(sk); |
1454 | if (rc) | |
1455 | goto out; | |
1456 | ||
1457 | if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { | |
1458 | /* wait till data arrives on the socket */ | |
1459 | timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * | |
1460 | MSEC_PER_SEC); | |
1461 | if (smc_sk(nsk)->use_fallback) { | |
1462 | struct sock *clcsk = smc_sk(nsk)->clcsock->sk; | |
1463 | ||
1464 | lock_sock(clcsk); | |
1465 | if (skb_queue_empty(&clcsk->sk_receive_queue)) | |
1466 | sk_wait_data(clcsk, &timeo, NULL); | |
1467 | release_sock(clcsk); | |
1468 | } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { | |
1469 | lock_sock(nsk); | |
b51fa1b1 | 1470 | smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); |
abb190f1 UB |
1471 | release_sock(nsk); |
1472 | } | |
1473 | } | |
ac713874 UB |
1474 | |
1475 | out: | |
51f1de79 | 1476 | sock_put(sk); /* sock_hold above */ |
ac713874 UB |
1477 | return rc; |
1478 | } | |
1479 | ||
1480 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
9b2c45d4 | 1481 | int peer) |
ac713874 UB |
1482 | { |
1483 | struct smc_sock *smc; | |
1484 | ||
b38d7324 UB |
1485 | if (peer && (sock->sk->sk_state != SMC_ACTIVE) && |
1486 | (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) | |
ac713874 UB |
1487 | return -ENOTCONN; |
1488 | ||
1489 | smc = smc_sk(sock->sk); | |
1490 | ||
9b2c45d4 | 1491 | return smc->clcsock->ops->getname(smc->clcsock, addr, peer); |
ac713874 UB |
1492 | } |
1493 | ||
1494 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
1495 | { | |
1496 | struct sock *sk = sock->sk; | |
1497 | struct smc_sock *smc; | |
1498 | int rc = -EPIPE; | |
1499 | ||
1500 | smc = smc_sk(sk); | |
1501 | lock_sock(sk); | |
b38d7324 UB |
1502 | if ((sk->sk_state != SMC_ACTIVE) && |
1503 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1504 | (sk->sk_state != SMC_INIT)) | |
ac713874 | 1505 | goto out; |
ee9dfbef UB |
1506 | |
1507 | if (msg->msg_flags & MSG_FASTOPEN) { | |
1508 | if (sk->sk_state == SMC_INIT) { | |
1509 | smc->use_fallback = true; | |
603cc149 | 1510 | smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; |
ee9dfbef UB |
1511 | } else { |
1512 | rc = -EINVAL; | |
1513 | goto out; | |
1514 | } | |
1515 | } | |
1516 | ||
ac713874 UB |
1517 | if (smc->use_fallback) |
1518 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
1519 | else | |
e6727f39 | 1520 | rc = smc_tx_sendmsg(smc, msg, len); |
ac713874 UB |
1521 | out: |
1522 | release_sock(sk); | |
1523 | return rc; | |
1524 | } | |
1525 | ||
1526 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
1527 | int flags) | |
1528 | { | |
1529 | struct sock *sk = sock->sk; | |
1530 | struct smc_sock *smc; | |
1531 | int rc = -ENOTCONN; | |
1532 | ||
1533 | smc = smc_sk(sk); | |
1534 | lock_sock(sk); | |
51c5aba3 KG |
1535 | if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { |
1536 | /* socket was connected before, no more data to read */ | |
1537 | rc = 0; | |
1538 | goto out; | |
1539 | } | |
b38d7324 UB |
1540 | if ((sk->sk_state == SMC_INIT) || |
1541 | (sk->sk_state == SMC_LISTEN) || | |
1542 | (sk->sk_state == SMC_CLOSED)) | |
ac713874 UB |
1543 | goto out; |
1544 | ||
b38d7324 UB |
1545 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { |
1546 | rc = 0; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
9014db20 | 1550 | if (smc->use_fallback) { |
ac713874 | 1551 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); |
9014db20 SR |
1552 | } else { |
1553 | msg->msg_namelen = 0; | |
1554 | rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); | |
1555 | } | |
b38d7324 | 1556 | |
ac713874 UB |
1557 | out: |
1558 | release_sock(sk); | |
1559 | return rc; | |
1560 | } | |
1561 | ||
ade994f4 | 1562 | static __poll_t smc_accept_poll(struct sock *parent) |
a046d57d | 1563 | { |
8dce2786 | 1564 | struct smc_sock *isk = smc_sk(parent); |
63e2480c | 1565 | __poll_t mask = 0; |
a046d57d | 1566 | |
8dce2786 UB |
1567 | spin_lock(&isk->accept_q_lock); |
1568 | if (!list_empty(&isk->accept_q)) | |
a9a08845 | 1569 | mask = EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1570 | spin_unlock(&isk->accept_q_lock); |
a046d57d | 1571 | |
8dce2786 | 1572 | return mask; |
a046d57d UB |
1573 | } |
1574 | ||
a11e1d43 LT |
1575 | static __poll_t smc_poll(struct file *file, struct socket *sock, |
1576 | poll_table *wait) | |
ac713874 UB |
1577 | { |
1578 | struct sock *sk = sock->sk; | |
ac713874 | 1579 | struct smc_sock *smc; |
50717a37 | 1580 | __poll_t mask = 0; |
ac713874 | 1581 | |
8dce2786 | 1582 | if (!sk) |
a9a08845 | 1583 | return EPOLLNVAL; |
8dce2786 | 1584 | |
ac713874 | 1585 | smc = smc_sk(sock->sk); |
648a5a7a | 1586 | if (smc->use_fallback) { |
a046d57d | 1587 | /* delegate to CLC child sock */ |
a11e1d43 | 1588 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
784813ae | 1589 | sk->sk_err = smc->clcsock->sk->sk_err; |
ac713874 | 1590 | } else { |
410da1e1 | 1591 | if (sk->sk_state != SMC_CLOSED) |
89ab066d | 1592 | sock_poll_wait(file, sock, wait); |
a046d57d | 1593 | if (sk->sk_err) |
a9a08845 | 1594 | mask |= EPOLLERR; |
b38d7324 UB |
1595 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || |
1596 | (sk->sk_state == SMC_CLOSED)) | |
a9a08845 | 1597 | mask |= EPOLLHUP; |
8dce2786 UB |
1598 | if (sk->sk_state == SMC_LISTEN) { |
1599 | /* woken up by sk_data_ready in smc_listen_work() */ | |
50717a37 UB |
1600 | mask |= smc_accept_poll(sk); |
1601 | } else if (smc->use_fallback) { /* as result of connect_work()*/ | |
1602 | mask |= smc->clcsock->ops->poll(file, smc->clcsock, | |
1603 | wait); | |
1604 | sk->sk_err = smc->clcsock->sk->sk_err; | |
8dce2786 | 1605 | } else { |
50717a37 UB |
1606 | if ((sk->sk_state != SMC_INIT && |
1607 | atomic_read(&smc->conn.sndbuf_space)) || | |
8dce2786 | 1608 | sk->sk_shutdown & SEND_SHUTDOWN) { |
a9a08845 | 1609 | mask |= EPOLLOUT | EPOLLWRNORM; |
8dce2786 UB |
1610 | } else { |
1611 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1612 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1613 | } | |
1614 | if (atomic_read(&smc->conn.bytes_to_rcv)) | |
a9a08845 | 1615 | mask |= EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1616 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 1617 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
8dce2786 | 1618 | if (sk->sk_state == SMC_APPCLOSEWAIT1) |
a9a08845 | 1619 | mask |= EPOLLIN; |
71d117f5 KG |
1620 | if (smc->conn.urg_state == SMC_URG_VALID) |
1621 | mask |= EPOLLPRI; | |
8dce2786 | 1622 | } |
ac713874 UB |
1623 | } |
1624 | ||
1625 | return mask; | |
1626 | } | |
1627 | ||
1628 | static int smc_shutdown(struct socket *sock, int how) | |
1629 | { | |
1630 | struct sock *sk = sock->sk; | |
1631 | struct smc_sock *smc; | |
1632 | int rc = -EINVAL; | |
b38d7324 | 1633 | int rc1 = 0; |
ac713874 UB |
1634 | |
1635 | smc = smc_sk(sk); | |
1636 | ||
1637 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
b38d7324 | 1638 | return rc; |
ac713874 UB |
1639 | |
1640 | lock_sock(sk); | |
1641 | ||
1642 | rc = -ENOTCONN; | |
caa21e19 | 1643 | if ((sk->sk_state != SMC_ACTIVE) && |
b38d7324 UB |
1644 | (sk->sk_state != SMC_PEERCLOSEWAIT1) && |
1645 | (sk->sk_state != SMC_PEERCLOSEWAIT2) && | |
1646 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1647 | (sk->sk_state != SMC_APPCLOSEWAIT2) && | |
1648 | (sk->sk_state != SMC_APPFINCLOSEWAIT)) | |
ac713874 UB |
1649 | goto out; |
1650 | if (smc->use_fallback) { | |
1651 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
1652 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
1653 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1654 | sk->sk_state = SMC_CLOSED; | |
b38d7324 | 1655 | goto out; |
ac713874 | 1656 | } |
b38d7324 UB |
1657 | switch (how) { |
1658 | case SHUT_RDWR: /* shutdown in both directions */ | |
1659 | rc = smc_close_active(smc); | |
1660 | break; | |
1661 | case SHUT_WR: | |
1662 | rc = smc_close_shutdown_write(smc); | |
1663 | break; | |
1664 | case SHUT_RD: | |
1255fcb2 UB |
1665 | rc = 0; |
1666 | /* nothing more to do because peer is not involved */ | |
b38d7324 UB |
1667 | break; |
1668 | } | |
1255fcb2 UB |
1669 | if (smc->clcsock) |
1670 | rc1 = kernel_sock_shutdown(smc->clcsock, how); | |
b38d7324 UB |
1671 | /* map sock_shutdown_cmd constants to sk_shutdown value range */ |
1672 | sk->sk_shutdown |= how + 1; | |
ac713874 UB |
1673 | |
1674 | out: | |
1675 | release_sock(sk); | |
b38d7324 | 1676 | return rc ? rc : rc1; |
ac713874 UB |
1677 | } |
1678 | ||
1679 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
1680 | char __user *optval, unsigned int optlen) | |
1681 | { | |
1682 | struct sock *sk = sock->sk; | |
1683 | struct smc_sock *smc; | |
01d2f7e2 | 1684 | int val, rc; |
ac713874 UB |
1685 | |
1686 | smc = smc_sk(sk); | |
1687 | ||
1688 | /* generic setsockopts reaching us here always apply to the | |
1689 | * CLC socket | |
1690 | */ | |
ee9dfbef UB |
1691 | rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, |
1692 | optval, optlen); | |
1693 | if (smc->clcsock->sk->sk_err) { | |
1694 | sk->sk_err = smc->clcsock->sk->sk_err; | |
1695 | sk->sk_error_report(sk); | |
1696 | } | |
1697 | if (rc) | |
1698 | return rc; | |
1699 | ||
01d2f7e2 | 1700 | if (optlen < sizeof(int)) |
3dc9f558 | 1701 | return -EINVAL; |
ac0107ed UB |
1702 | if (get_user(val, (int __user *)optval)) |
1703 | return -EFAULT; | |
01d2f7e2 | 1704 | |
ee9dfbef UB |
1705 | lock_sock(sk); |
1706 | switch (optname) { | |
1707 | case TCP_ULP: | |
1708 | case TCP_FASTOPEN: | |
1709 | case TCP_FASTOPEN_CONNECT: | |
1710 | case TCP_FASTOPEN_KEY: | |
1711 | case TCP_FASTOPEN_NO_COOKIE: | |
1712 | /* option not supported by SMC */ | |
1713 | if (sk->sk_state == SMC_INIT) { | |
1714 | smc->use_fallback = true; | |
603cc149 | 1715 | smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; |
ee9dfbef UB |
1716 | } else { |
1717 | if (!smc->use_fallback) | |
1718 | rc = -EINVAL; | |
1719 | } | |
1720 | break; | |
01d2f7e2 UB |
1721 | case TCP_NODELAY: |
1722 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1723 | if (val && !smc->use_fallback) |
01d2f7e2 UB |
1724 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1725 | 0); | |
1726 | } | |
1727 | break; | |
1728 | case TCP_CORK: | |
1729 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1730 | if (!val && !smc->use_fallback) |
01d2f7e2 UB |
1731 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1732 | 0); | |
1733 | } | |
1734 | break; | |
abb190f1 UB |
1735 | case TCP_DEFER_ACCEPT: |
1736 | smc->sockopt_defer_accept = val; | |
1737 | break; | |
ee9dfbef UB |
1738 | default: |
1739 | break; | |
1740 | } | |
1741 | release_sock(sk); | |
1742 | ||
1743 | return rc; | |
ac713874 UB |
1744 | } |
1745 | ||
1746 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
1747 | char __user *optval, int __user *optlen) | |
1748 | { | |
1749 | struct smc_sock *smc; | |
1750 | ||
1751 | smc = smc_sk(sock->sk); | |
1752 | /* socket options apply to the CLC socket */ | |
1753 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
1754 | optval, optlen); | |
1755 | } | |
1756 | ||
1757 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
1758 | unsigned long arg) | |
1759 | { | |
de8474eb SR |
1760 | union smc_host_cursor cons, urg; |
1761 | struct smc_connection *conn; | |
ac713874 | 1762 | struct smc_sock *smc; |
9b67e26f | 1763 | int answ; |
ac713874 UB |
1764 | |
1765 | smc = smc_sk(sock->sk); | |
de8474eb | 1766 | conn = &smc->conn; |
7311d665 | 1767 | lock_sock(&smc->sk); |
9b67e26f | 1768 | if (smc->use_fallback) { |
7311d665 UB |
1769 | if (!smc->clcsock) { |
1770 | release_sock(&smc->sk); | |
9b67e26f | 1771 | return -EBADF; |
7311d665 UB |
1772 | } |
1773 | answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); | |
1774 | release_sock(&smc->sk); | |
1775 | return answ; | |
9b67e26f UB |
1776 | } |
1777 | switch (cmd) { | |
1778 | case SIOCINQ: /* same as FIONREAD */ | |
1992d998 UB |
1779 | if (smc->sk.sk_state == SMC_LISTEN) { |
1780 | release_sock(&smc->sk); | |
9b67e26f | 1781 | return -EINVAL; |
1992d998 | 1782 | } |
2351abe6 UB |
1783 | if (smc->sk.sk_state == SMC_INIT || |
1784 | smc->sk.sk_state == SMC_CLOSED) | |
1785 | answ = 0; | |
1786 | else | |
1787 | answ = atomic_read(&smc->conn.bytes_to_rcv); | |
9b67e26f UB |
1788 | break; |
1789 | case SIOCOUTQ: | |
1790 | /* output queue size (not send + not acked) */ | |
1992d998 UB |
1791 | if (smc->sk.sk_state == SMC_LISTEN) { |
1792 | release_sock(&smc->sk); | |
9b67e26f | 1793 | return -EINVAL; |
1992d998 | 1794 | } |
2351abe6 UB |
1795 | if (smc->sk.sk_state == SMC_INIT || |
1796 | smc->sk.sk_state == SMC_CLOSED) | |
1797 | answ = 0; | |
1798 | else | |
1799 | answ = smc->conn.sndbuf_desc->len - | |
9b67e26f UB |
1800 | atomic_read(&smc->conn.sndbuf_space); |
1801 | break; | |
1802 | case SIOCOUTQNSD: | |
1803 | /* output queue size (not send only) */ | |
1992d998 UB |
1804 | if (smc->sk.sk_state == SMC_LISTEN) { |
1805 | release_sock(&smc->sk); | |
9b67e26f | 1806 | return -EINVAL; |
1992d998 | 1807 | } |
2351abe6 UB |
1808 | if (smc->sk.sk_state == SMC_INIT || |
1809 | smc->sk.sk_state == SMC_CLOSED) | |
1810 | answ = 0; | |
1811 | else | |
1812 | answ = smc_tx_prepared_sends(&smc->conn); | |
9b67e26f | 1813 | break; |
de8474eb | 1814 | case SIOCATMARK: |
1992d998 UB |
1815 | if (smc->sk.sk_state == SMC_LISTEN) { |
1816 | release_sock(&smc->sk); | |
de8474eb | 1817 | return -EINVAL; |
1992d998 | 1818 | } |
de8474eb SR |
1819 | if (smc->sk.sk_state == SMC_INIT || |
1820 | smc->sk.sk_state == SMC_CLOSED) { | |
1821 | answ = 0; | |
1822 | } else { | |
bac6de7b SR |
1823 | smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); |
1824 | smc_curs_copy(&urg, &conn->urg_curs, conn); | |
de8474eb SR |
1825 | answ = smc_curs_diff(conn->rmb_desc->len, |
1826 | &cons, &urg) == 1; | |
1827 | } | |
1828 | break; | |
9b67e26f | 1829 | default: |
1992d998 | 1830 | release_sock(&smc->sk); |
9b67e26f UB |
1831 | return -ENOIOCTLCMD; |
1832 | } | |
1992d998 | 1833 | release_sock(&smc->sk); |
9b67e26f UB |
1834 | |
1835 | return put_user(answ, (int __user *)arg); | |
ac713874 UB |
1836 | } |
1837 | ||
1838 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
1839 | int offset, size_t size, int flags) | |
1840 | { | |
1841 | struct sock *sk = sock->sk; | |
1842 | struct smc_sock *smc; | |
1843 | int rc = -EPIPE; | |
1844 | ||
1845 | smc = smc_sk(sk); | |
1846 | lock_sock(sk); | |
bda27ff5 SR |
1847 | if (sk->sk_state != SMC_ACTIVE) { |
1848 | release_sock(sk); | |
ac713874 | 1849 | goto out; |
bda27ff5 SR |
1850 | } |
1851 | release_sock(sk); | |
ac713874 UB |
1852 | if (smc->use_fallback) |
1853 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
1854 | size, flags); | |
1855 | else | |
1856 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
1857 | ||
1858 | out: | |
ac713874 UB |
1859 | return rc; |
1860 | } | |
1861 | ||
9014db20 SR |
1862 | /* Map the affected portions of the rmbe into an spd, note the number of bytes |
1863 | * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor | |
1864 | * updates till whenever a respective page has been fully processed. | |
1865 | * Note that subsequent recv() calls have to wait till all splice() processing | |
1866 | * completed. | |
1867 | */ | |
ac713874 UB |
1868 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, |
1869 | struct pipe_inode_info *pipe, size_t len, | |
9014db20 | 1870 | unsigned int flags) |
ac713874 UB |
1871 | { |
1872 | struct sock *sk = sock->sk; | |
1873 | struct smc_sock *smc; | |
1874 | int rc = -ENOTCONN; | |
1875 | ||
1876 | smc = smc_sk(sk); | |
1877 | lock_sock(sk); | |
51c5aba3 KG |
1878 | if (sk->sk_state == SMC_CLOSED && (sk->sk_shutdown & RCV_SHUTDOWN)) { |
1879 | /* socket was connected before, no more data to read */ | |
1880 | rc = 0; | |
1881 | goto out; | |
1882 | } | |
9014db20 SR |
1883 | if (sk->sk_state == SMC_INIT || |
1884 | sk->sk_state == SMC_LISTEN || | |
1885 | sk->sk_state == SMC_CLOSED) | |
1886 | goto out; | |
1887 | ||
1888 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { | |
1889 | rc = 0; | |
ac713874 | 1890 | goto out; |
9014db20 SR |
1891 | } |
1892 | ||
ac713874 UB |
1893 | if (smc->use_fallback) { |
1894 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
1895 | pipe, len, flags); | |
1896 | } else { | |
9014db20 SR |
1897 | if (*ppos) { |
1898 | rc = -ESPIPE; | |
1899 | goto out; | |
1900 | } | |
1901 | if (flags & SPLICE_F_NONBLOCK) | |
1902 | flags = MSG_DONTWAIT; | |
1903 | else | |
1904 | flags = 0; | |
1905 | rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); | |
ac713874 UB |
1906 | } |
1907 | out: | |
1908 | release_sock(sk); | |
9014db20 | 1909 | |
ac713874 UB |
1910 | return rc; |
1911 | } | |
1912 | ||
1913 | /* must look like tcp */ | |
1914 | static const struct proto_ops smc_sock_ops = { | |
1915 | .family = PF_SMC, | |
1916 | .owner = THIS_MODULE, | |
1917 | .release = smc_release, | |
1918 | .bind = smc_bind, | |
1919 | .connect = smc_connect, | |
1920 | .socketpair = sock_no_socketpair, | |
1921 | .accept = smc_accept, | |
1922 | .getname = smc_getname, | |
a11e1d43 | 1923 | .poll = smc_poll, |
ac713874 UB |
1924 | .ioctl = smc_ioctl, |
1925 | .listen = smc_listen, | |
1926 | .shutdown = smc_shutdown, | |
1927 | .setsockopt = smc_setsockopt, | |
1928 | .getsockopt = smc_getsockopt, | |
1929 | .sendmsg = smc_sendmsg, | |
1930 | .recvmsg = smc_recvmsg, | |
1931 | .mmap = sock_no_mmap, | |
1932 | .sendpage = smc_sendpage, | |
1933 | .splice_read = smc_splice_read, | |
1934 | }; | |
1935 | ||
1936 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1937 | int kern) | |
1938 | { | |
aaa4d33f | 1939 | int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; |
ac713874 UB |
1940 | struct smc_sock *smc; |
1941 | struct sock *sk; | |
1942 | int rc; | |
1943 | ||
1944 | rc = -ESOCKTNOSUPPORT; | |
1945 | if (sock->type != SOCK_STREAM) | |
1946 | goto out; | |
1947 | ||
1948 | rc = -EPROTONOSUPPORT; | |
aaa4d33f | 1949 | if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) |
ac713874 UB |
1950 | goto out; |
1951 | ||
1952 | rc = -ENOBUFS; | |
1953 | sock->ops = &smc_sock_ops; | |
aaa4d33f | 1954 | sk = smc_sock_alloc(net, sock, protocol); |
ac713874 UB |
1955 | if (!sk) |
1956 | goto out; | |
1957 | ||
1958 | /* create internal TCP socket for CLC handshake and fallback */ | |
1959 | smc = smc_sk(sk); | |
a046d57d | 1960 | smc->use_fallback = false; /* assume rdma capability first */ |
603cc149 | 1961 | smc->fallback_rsn = 0; |
aaa4d33f KG |
1962 | rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, |
1963 | &smc->clcsock); | |
a5dcb73b | 1964 | if (rc) { |
ac713874 | 1965 | sk_common_release(sk); |
a5dcb73b DC |
1966 | goto out; |
1967 | } | |
cd6851f3 UB |
1968 | smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
1969 | smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); | |
ac713874 UB |
1970 | |
1971 | out: | |
1972 | return rc; | |
1973 | } | |
1974 | ||
1975 | static const struct net_proto_family smc_sock_family_ops = { | |
1976 | .family = PF_SMC, | |
1977 | .owner = THIS_MODULE, | |
1978 | .create = smc_create, | |
1979 | }; | |
1980 | ||
64e28b52 HW |
1981 | unsigned int smc_net_id; |
1982 | ||
1983 | static __net_init int smc_net_init(struct net *net) | |
1984 | { | |
1985 | return smc_pnet_net_init(net); | |
1986 | } | |
1987 | ||
1988 | static void __net_exit smc_net_exit(struct net *net) | |
1989 | { | |
1990 | smc_pnet_net_exit(net); | |
1991 | } | |
1992 | ||
1993 | static struct pernet_operations smc_net_ops = { | |
1994 | .init = smc_net_init, | |
1995 | .exit = smc_net_exit, | |
1996 | .id = &smc_net_id, | |
1997 | .size = sizeof(struct smc_net), | |
1998 | }; | |
1999 | ||
ac713874 UB |
2000 | static int __init smc_init(void) |
2001 | { | |
2002 | int rc; | |
2003 | ||
64e28b52 HW |
2004 | rc = register_pernet_subsys(&smc_net_ops); |
2005 | if (rc) | |
2006 | return rc; | |
2007 | ||
6812baab TR |
2008 | rc = smc_pnet_init(); |
2009 | if (rc) | |
2010 | return rc; | |
2011 | ||
9bf9abea UB |
2012 | rc = smc_llc_init(); |
2013 | if (rc) { | |
2014 | pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); | |
2015 | goto out_pnet; | |
2016 | } | |
2017 | ||
5f08318f UB |
2018 | rc = smc_cdc_init(); |
2019 | if (rc) { | |
2020 | pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); | |
2021 | goto out_pnet; | |
2022 | } | |
2023 | ||
ac713874 UB |
2024 | rc = proto_register(&smc_proto, 1); |
2025 | if (rc) { | |
aaa4d33f | 2026 | pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); |
6812baab | 2027 | goto out_pnet; |
ac713874 UB |
2028 | } |
2029 | ||
aaa4d33f KG |
2030 | rc = proto_register(&smc_proto6, 1); |
2031 | if (rc) { | |
2032 | pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); | |
2033 | goto out_proto; | |
2034 | } | |
2035 | ||
ac713874 UB |
2036 | rc = sock_register(&smc_sock_family_ops); |
2037 | if (rc) { | |
2038 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
aaa4d33f | 2039 | goto out_proto6; |
ac713874 | 2040 | } |
f16a7dd5 | 2041 | INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); |
aaa4d33f | 2042 | INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); |
ac713874 | 2043 | |
a4cf0443 UB |
2044 | rc = smc_ib_register_client(); |
2045 | if (rc) { | |
2046 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
2047 | goto out_sock; | |
2048 | } | |
2049 | ||
c5c1cc9c | 2050 | static_branch_enable(&tcp_have_smc); |
ac713874 UB |
2051 | return 0; |
2052 | ||
a4cf0443 UB |
2053 | out_sock: |
2054 | sock_unregister(PF_SMC); | |
aaa4d33f KG |
2055 | out_proto6: |
2056 | proto_unregister(&smc_proto6); | |
ac713874 UB |
2057 | out_proto: |
2058 | proto_unregister(&smc_proto); | |
6812baab TR |
2059 | out_pnet: |
2060 | smc_pnet_exit(); | |
ac713874 UB |
2061 | return rc; |
2062 | } | |
2063 | ||
2064 | static void __exit smc_exit(void) | |
2065 | { | |
9fda3510 | 2066 | smc_core_exit(); |
c5c1cc9c | 2067 | static_branch_disable(&tcp_have_smc); |
a4cf0443 | 2068 | smc_ib_unregister_client(); |
ac713874 | 2069 | sock_unregister(PF_SMC); |
aaa4d33f | 2070 | proto_unregister(&smc_proto6); |
ac713874 | 2071 | proto_unregister(&smc_proto); |
6812baab | 2072 | smc_pnet_exit(); |
64e28b52 | 2073 | unregister_pernet_subsys(&smc_net_ops); |
ac713874 UB |
2074 | } |
2075 | ||
2076 | module_init(smc_init); | |
2077 | module_exit(smc_exit); | |
2078 | ||
2079 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
2080 | MODULE_DESCRIPTION("smc socket address family"); | |
2081 | MODULE_LICENSE("GPL"); | |
2082 | MODULE_ALIAS_NETPROTO(PF_SMC); |