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 UB |
32 | |
33 | #include "smc.h" | |
a046d57d | 34 | #include "smc_clc.h" |
9bf9abea | 35 | #include "smc_llc.h" |
5f08318f | 36 | #include "smc_cdc.h" |
0cfdd8f9 | 37 | #include "smc_core.h" |
a4cf0443 | 38 | #include "smc_ib.h" |
41349844 | 39 | #include "smc_ism.h" |
6812baab | 40 | #include "smc_pnet.h" |
e6727f39 | 41 | #include "smc_tx.h" |
952310cc | 42 | #include "smc_rx.h" |
b38d7324 | 43 | #include "smc_close.h" |
ac713874 | 44 | |
0cfdd8f9 UB |
45 | static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group |
46 | * creation | |
47 | */ | |
48 | ||
a046d57d | 49 | static void smc_tcp_listen_work(struct work_struct *); |
24ac3a08 | 50 | static void smc_connect_work(struct work_struct *); |
a046d57d | 51 | |
ac713874 UB |
52 | static void smc_set_keepalive(struct sock *sk, int val) |
53 | { | |
54 | struct smc_sock *smc = smc_sk(sk); | |
55 | ||
56 | smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); | |
57 | } | |
58 | ||
f16a7dd5 UB |
59 | static struct smc_hashinfo smc_v4_hashinfo = { |
60 | .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), | |
61 | }; | |
62 | ||
aaa4d33f KG |
63 | static struct smc_hashinfo smc_v6_hashinfo = { |
64 | .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), | |
65 | }; | |
66 | ||
f16a7dd5 UB |
67 | int smc_hash_sk(struct sock *sk) |
68 | { | |
69 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
70 | struct hlist_head *head; | |
71 | ||
72 | head = &h->ht; | |
73 | ||
74 | write_lock_bh(&h->lock); | |
75 | sk_add_node(sk, head); | |
76 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
77 | write_unlock_bh(&h->lock); | |
78 | ||
79 | return 0; | |
80 | } | |
81 | EXPORT_SYMBOL_GPL(smc_hash_sk); | |
82 | ||
83 | void smc_unhash_sk(struct sock *sk) | |
84 | { | |
85 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
86 | ||
87 | write_lock_bh(&h->lock); | |
88 | if (sk_del_node_init(sk)) | |
89 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
90 | write_unlock_bh(&h->lock); | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(smc_unhash_sk); | |
93 | ||
94 | struct proto smc_proto = { | |
ac713874 UB |
95 | .name = "SMC", |
96 | .owner = THIS_MODULE, | |
97 | .keepalive = smc_set_keepalive, | |
f16a7dd5 UB |
98 | .hash = smc_hash_sk, |
99 | .unhash = smc_unhash_sk, | |
ac713874 | 100 | .obj_size = sizeof(struct smc_sock), |
f16a7dd5 | 101 | .h.smc_hash = &smc_v4_hashinfo, |
5f0d5a3a | 102 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
ac713874 | 103 | }; |
f16a7dd5 | 104 | EXPORT_SYMBOL_GPL(smc_proto); |
ac713874 | 105 | |
aaa4d33f KG |
106 | struct proto smc_proto6 = { |
107 | .name = "SMC6", | |
108 | .owner = THIS_MODULE, | |
109 | .keepalive = smc_set_keepalive, | |
110 | .hash = smc_hash_sk, | |
111 | .unhash = smc_unhash_sk, | |
112 | .obj_size = sizeof(struct smc_sock), | |
113 | .h.smc_hash = &smc_v6_hashinfo, | |
114 | .slab_flags = SLAB_TYPESAFE_BY_RCU, | |
115 | }; | |
116 | EXPORT_SYMBOL_GPL(smc_proto6); | |
117 | ||
ac713874 UB |
118 | static int smc_release(struct socket *sock) |
119 | { | |
120 | struct sock *sk = sock->sk; | |
121 | struct smc_sock *smc; | |
b38d7324 | 122 | int rc = 0; |
ac713874 UB |
123 | |
124 | if (!sk) | |
125 | goto out; | |
126 | ||
127 | smc = smc_sk(sk); | |
24ac3a08 UB |
128 | |
129 | /* cleanup for a dangling non-blocking connect */ | |
130 | flush_work(&smc->connect_work); | |
131 | kfree(smc->connect_info); | |
132 | smc->connect_info = NULL; | |
133 | ||
b38d7324 UB |
134 | if (sk->sk_state == SMC_LISTEN) |
135 | /* smc_close_non_accepted() is called and acquires | |
136 | * sock lock for child sockets again | |
137 | */ | |
138 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
139 | else | |
140 | lock_sock(sk); | |
ac713874 | 141 | |
51f1de79 | 142 | if (!smc->use_fallback) { |
b38d7324 UB |
143 | rc = smc_close_active(smc); |
144 | sock_set_flag(sk, SOCK_DEAD); | |
145 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
146 | } | |
ac713874 UB |
147 | if (smc->clcsock) { |
148 | sock_release(smc->clcsock); | |
149 | smc->clcsock = NULL; | |
150 | } | |
51f1de79 | 151 | if (smc->use_fallback) { |
e1bbdd57 UB |
152 | if (sk->sk_state != SMC_LISTEN && sk->sk_state != SMC_INIT) |
153 | sock_put(sk); /* passive closing */ | |
51f1de79 UB |
154 | sk->sk_state = SMC_CLOSED; |
155 | sk->sk_state_change(sk); | |
156 | } | |
ac713874 UB |
157 | |
158 | /* detach socket */ | |
159 | sock_orphan(sk); | |
160 | sock->sk = NULL; | |
51f1de79 | 161 | if (!smc->use_fallback && sk->sk_state == SMC_CLOSED) |
b38d7324 | 162 | smc_conn_free(&smc->conn); |
ac713874 UB |
163 | release_sock(sk); |
164 | ||
51f1de79 UB |
165 | sk->sk_prot->unhash(sk); |
166 | sock_put(sk); /* final sock_put */ | |
ac713874 | 167 | out: |
b38d7324 | 168 | return rc; |
ac713874 UB |
169 | } |
170 | ||
171 | static void smc_destruct(struct sock *sk) | |
172 | { | |
173 | if (sk->sk_state != SMC_CLOSED) | |
174 | return; | |
175 | if (!sock_flag(sk, SOCK_DEAD)) | |
176 | return; | |
177 | ||
178 | sk_refcnt_debug_dec(sk); | |
179 | } | |
180 | ||
aaa4d33f KG |
181 | static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, |
182 | int protocol) | |
ac713874 UB |
183 | { |
184 | struct smc_sock *smc; | |
aaa4d33f | 185 | struct proto *prot; |
ac713874 UB |
186 | struct sock *sk; |
187 | ||
aaa4d33f KG |
188 | prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; |
189 | sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); | |
ac713874 UB |
190 | if (!sk) |
191 | return NULL; | |
192 | ||
193 | sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ | |
194 | sk->sk_state = SMC_INIT; | |
195 | sk->sk_destruct = smc_destruct; | |
aaa4d33f | 196 | sk->sk_protocol = protocol; |
ac713874 | 197 | smc = smc_sk(sk); |
a046d57d | 198 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
24ac3a08 | 199 | INIT_WORK(&smc->connect_work, smc_connect_work); |
be7f3e59 | 200 | INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); |
a046d57d UB |
201 | INIT_LIST_HEAD(&smc->accept_q); |
202 | spin_lock_init(&smc->accept_q_lock); | |
be7f3e59 | 203 | spin_lock_init(&smc->conn.send_lock); |
f16a7dd5 | 204 | sk->sk_prot->hash(sk); |
a046d57d | 205 | sk_refcnt_debug_inc(sk); |
ac713874 UB |
206 | |
207 | return sk; | |
208 | } | |
209 | ||
210 | static int smc_bind(struct socket *sock, struct sockaddr *uaddr, | |
211 | int addr_len) | |
212 | { | |
213 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
214 | struct sock *sk = sock->sk; | |
215 | struct smc_sock *smc; | |
216 | int rc; | |
217 | ||
218 | smc = smc_sk(sk); | |
219 | ||
220 | /* replicate tests from inet_bind(), to be safe wrt. future changes */ | |
221 | rc = -EINVAL; | |
222 | if (addr_len < sizeof(struct sockaddr_in)) | |
223 | goto out; | |
224 | ||
225 | rc = -EAFNOSUPPORT; | |
aaa4d33f KG |
226 | if (addr->sin_family != AF_INET && |
227 | addr->sin_family != AF_INET6 && | |
228 | addr->sin_family != AF_UNSPEC) | |
229 | goto out; | |
ac713874 | 230 | /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ |
aaa4d33f KG |
231 | if (addr->sin_family == AF_UNSPEC && |
232 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
ac713874 UB |
233 | goto out; |
234 | ||
235 | lock_sock(sk); | |
236 | ||
237 | /* Check if socket is already active */ | |
238 | rc = -EINVAL; | |
239 | if (sk->sk_state != SMC_INIT) | |
240 | goto out_rel; | |
241 | ||
242 | smc->clcsock->sk->sk_reuse = sk->sk_reuse; | |
243 | rc = kernel_bind(smc->clcsock, uaddr, addr_len); | |
244 | ||
245 | out_rel: | |
246 | release_sock(sk); | |
247 | out: | |
248 | return rc; | |
249 | } | |
250 | ||
251 | static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, | |
252 | unsigned long mask) | |
253 | { | |
254 | /* options we don't get control via setsockopt for */ | |
255 | nsk->sk_type = osk->sk_type; | |
256 | nsk->sk_sndbuf = osk->sk_sndbuf; | |
257 | nsk->sk_rcvbuf = osk->sk_rcvbuf; | |
258 | nsk->sk_sndtimeo = osk->sk_sndtimeo; | |
259 | nsk->sk_rcvtimeo = osk->sk_rcvtimeo; | |
260 | nsk->sk_mark = osk->sk_mark; | |
261 | nsk->sk_priority = osk->sk_priority; | |
262 | nsk->sk_rcvlowat = osk->sk_rcvlowat; | |
263 | nsk->sk_bound_dev_if = osk->sk_bound_dev_if; | |
264 | nsk->sk_err = osk->sk_err; | |
265 | ||
266 | nsk->sk_flags &= ~mask; | |
267 | nsk->sk_flags |= osk->sk_flags & mask; | |
268 | } | |
269 | ||
270 | #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ | |
271 | (1UL << SOCK_KEEPOPEN) | \ | |
272 | (1UL << SOCK_LINGER) | \ | |
273 | (1UL << SOCK_BROADCAST) | \ | |
274 | (1UL << SOCK_TIMESTAMP) | \ | |
275 | (1UL << SOCK_DBG) | \ | |
276 | (1UL << SOCK_RCVTSTAMP) | \ | |
277 | (1UL << SOCK_RCVTSTAMPNS) | \ | |
278 | (1UL << SOCK_LOCALROUTE) | \ | |
279 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
280 | (1UL << SOCK_RXQ_OVFL) | \ | |
281 | (1UL << SOCK_WIFI_STATUS) | \ | |
282 | (1UL << SOCK_NOFCS) | \ | |
283 | (1UL << SOCK_FILTER_LOCKED)) | |
284 | /* copy only relevant settings and flags of SOL_SOCKET level from smc to | |
285 | * clc socket (since smc is not called for these options from net/core) | |
286 | */ | |
287 | static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) | |
288 | { | |
289 | smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); | |
290 | } | |
291 | ||
292 | #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ | |
293 | (1UL << SOCK_KEEPOPEN) | \ | |
294 | (1UL << SOCK_LINGER) | \ | |
295 | (1UL << SOCK_DBG)) | |
296 | /* copy only settings and flags relevant for smc from clc to smc socket */ | |
297 | static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) | |
298 | { | |
299 | smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); | |
300 | } | |
301 | ||
44aa81ce KG |
302 | /* register a new rmb, optionally send confirm_rkey msg to register with peer */ |
303 | static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, | |
304 | bool conf_rkey) | |
e63a5f8c KG |
305 | { |
306 | /* register memory region for new rmb */ | |
a6920d1d KG |
307 | if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { |
308 | rmb_desc->regerr = 1; | |
e63a5f8c | 309 | return -EFAULT; |
a6920d1d | 310 | } |
44aa81ce KG |
311 | if (!conf_rkey) |
312 | return 0; | |
313 | /* exchange confirm_rkey msg with peer */ | |
314 | if (smc_llc_do_confirm_rkey(link, rmb_desc)) { | |
315 | rmb_desc->regerr = 1; | |
316 | return -EFAULT; | |
317 | } | |
e63a5f8c KG |
318 | return 0; |
319 | } | |
320 | ||
0f627126 | 321 | static int smc_clnt_conf_first_link(struct smc_sock *smc) |
9bf9abea | 322 | { |
877ae5be | 323 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
324 | struct smc_link_group *lgr = smc->conn.lgr; |
325 | struct smc_link *link; | |
326 | int rest; | |
327 | int rc; | |
328 | ||
329 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
330 | /* receive CONFIRM LINK request from server over RoCE fabric */ | |
331 | rest = wait_for_completion_interruptible_timeout( | |
332 | &link->llc_confirm, | |
333 | SMC_LLC_WAIT_FIRST_TIME); | |
334 | if (rest <= 0) { | |
335 | struct smc_clc_msg_decline dclc; | |
336 | ||
337 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
338 | SMC_CLC_DECLINE); | |
339 | return rc; | |
340 | } | |
341 | ||
75d320d6 KG |
342 | if (link->llc_confirm_rc) |
343 | return SMC_CLC_DECL_RMBE_EC; | |
344 | ||
9bf9abea UB |
345 | rc = smc_ib_modify_qp_rts(link); |
346 | if (rc) | |
603cc149 | 347 | return SMC_CLC_DECL_ERR_RDYLNK; |
9bf9abea UB |
348 | |
349 | smc_wr_remember_qp_attr(link); | |
652a1e41 | 350 | |
44aa81ce | 351 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
603cc149 | 352 | return SMC_CLC_DECL_ERR_REGRMB; |
652a1e41 | 353 | |
9bf9abea | 354 | /* send CONFIRM LINK response over RoCE fabric */ |
947541f3 | 355 | rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP); |
9bf9abea | 356 | if (rc < 0) |
603cc149 | 357 | return SMC_CLC_DECL_TIMEOUT_CL; |
9bf9abea | 358 | |
52bedf37 KG |
359 | /* receive ADD LINK request from server over RoCE fabric */ |
360 | rest = wait_for_completion_interruptible_timeout(&link->llc_add, | |
361 | SMC_LLC_WAIT_TIME); | |
362 | if (rest <= 0) { | |
363 | struct smc_clc_msg_decline dclc; | |
364 | ||
365 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
366 | SMC_CLC_DECLINE); | |
367 | return rc; | |
368 | } | |
369 | ||
370 | /* send add link reject message, only one link supported for now */ | |
371 | rc = smc_llc_send_add_link(link, | |
372 | link->smcibdev->mac[link->ibport - 1], | |
7005ada6 | 373 | link->gid, SMC_LLC_RESP); |
52bedf37 | 374 | if (rc < 0) |
603cc149 | 375 | return SMC_CLC_DECL_TIMEOUT_AL; |
52bedf37 | 376 | |
877ae5be | 377 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 378 | |
75d320d6 | 379 | return 0; |
9bf9abea UB |
380 | } |
381 | ||
41349844 HW |
382 | static void smcr_conn_save_peer_info(struct smc_sock *smc, |
383 | struct smc_clc_msg_accept_confirm *clc) | |
0cfdd8f9 | 384 | { |
95d8d263 HW |
385 | int bufsize = smc_uncompress_bufsize(clc->rmbe_size); |
386 | ||
92a138e3 | 387 | smc->conn.peer_rmbe_idx = clc->rmbe_idx; |
5f08318f | 388 | smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); |
95d8d263 | 389 | smc->conn.peer_rmbe_size = bufsize; |
cd6851f3 | 390 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); |
95d8d263 | 391 | smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1); |
0cfdd8f9 UB |
392 | } |
393 | ||
41349844 HW |
394 | static void smcd_conn_save_peer_info(struct smc_sock *smc, |
395 | struct smc_clc_msg_accept_confirm *clc) | |
396 | { | |
397 | int bufsize = smc_uncompress_bufsize(clc->dmbe_size); | |
398 | ||
399 | smc->conn.peer_rmbe_idx = clc->dmbe_idx; | |
400 | smc->conn.peer_token = clc->token; | |
401 | /* msg header takes up space in the buffer */ | |
402 | smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg); | |
403 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); | |
404 | smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx; | |
405 | } | |
406 | ||
407 | static void smc_conn_save_peer_info(struct smc_sock *smc, | |
408 | struct smc_clc_msg_accept_confirm *clc) | |
409 | { | |
410 | if (smc->conn.lgr->is_smcd) | |
411 | smcd_conn_save_peer_info(smc, clc); | |
412 | else | |
413 | smcr_conn_save_peer_info(smc, clc); | |
414 | } | |
415 | ||
0cfdd8f9 UB |
416 | static void smc_link_save_peer_info(struct smc_link *link, |
417 | struct smc_clc_msg_accept_confirm *clc) | |
418 | { | |
419 | link->peer_qpn = ntoh24(clc->qpn); | |
420 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
421 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
422 | link->peer_psn = ntoh24(clc->psn); | |
423 | link->peer_mtu = clc->qp_mtu; | |
424 | } | |
425 | ||
3b2dec26 | 426 | /* fall back during connect */ |
603cc149 | 427 | static int smc_connect_fallback(struct smc_sock *smc, int reason_code) |
a046d57d | 428 | { |
3b2dec26 | 429 | smc->use_fallback = true; |
603cc149 | 430 | smc->fallback_rsn = reason_code; |
3b2dec26 HW |
431 | smc_copy_sock_settings_to_clc(smc); |
432 | if (smc->sk.sk_state == SMC_INIT) | |
433 | smc->sk.sk_state = SMC_ACTIVE; | |
434 | return 0; | |
435 | } | |
51f1de79 | 436 | |
3b2dec26 HW |
437 | /* decline and fall back during connect */ |
438 | static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code) | |
439 | { | |
440 | int rc; | |
ee9dfbef | 441 | |
e1bbdd57 UB |
442 | if (reason_code < 0) { /* error, fallback is not possible */ |
443 | if (smc->sk.sk_state == SMC_INIT) | |
444 | sock_put(&smc->sk); /* passive closing */ | |
3b2dec26 | 445 | return reason_code; |
e1bbdd57 | 446 | } |
603cc149 | 447 | if (reason_code != SMC_CLC_DECL_PEERDECL) { |
3b2dec26 | 448 | rc = smc_clc_send_decline(smc, reason_code); |
e1bbdd57 UB |
449 | if (rc < 0) { |
450 | if (smc->sk.sk_state == SMC_INIT) | |
451 | sock_put(&smc->sk); /* passive closing */ | |
3b2dec26 | 452 | return rc; |
e1bbdd57 | 453 | } |
c5c1cc9c | 454 | } |
603cc149 | 455 | return smc_connect_fallback(smc, reason_code); |
3b2dec26 | 456 | } |
c5c1cc9c | 457 | |
3b2dec26 HW |
458 | /* abort connecting */ |
459 | static int smc_connect_abort(struct smc_sock *smc, int reason_code, | |
460 | int local_contact) | |
461 | { | |
462 | if (local_contact == SMC_FIRST_CONTACT) | |
463 | smc_lgr_forget(smc->conn.lgr); | |
464 | mutex_unlock(&smc_create_lgr_pending); | |
465 | smc_conn_free(&smc->conn); | |
3b2dec26 HW |
466 | return reason_code; |
467 | } | |
468 | ||
469 | /* check if there is a rdma device available for this connection. */ | |
470 | /* called for connect and listen */ | |
471 | static int smc_check_rdma(struct smc_sock *smc, struct smc_ib_device **ibdev, | |
7005ada6 | 472 | u8 *ibport, unsigned short vlan_id, u8 gid[]) |
3b2dec26 HW |
473 | { |
474 | int reason_code = 0; | |
a046d57d UB |
475 | |
476 | /* PNET table look up: search active ib_device and port | |
477 | * within same PNETID that also contains the ethernet device | |
478 | * used for the internal TCP socket | |
479 | */ | |
7005ada6 UB |
480 | smc_pnet_find_roce_resource(smc->clcsock->sk, ibdev, ibport, vlan_id, |
481 | gid); | |
3b2dec26 | 482 | if (!(*ibdev)) |
a046d57d | 483 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ |
3b2dec26 HW |
484 | |
485 | return reason_code; | |
486 | } | |
487 | ||
41349844 HW |
488 | /* check if there is an ISM device available for this connection. */ |
489 | /* called for connect and listen */ | |
490 | static int smc_check_ism(struct smc_sock *smc, struct smcd_dev **ismdev) | |
491 | { | |
492 | /* Find ISM device with same PNETID as connecting interface */ | |
493 | smc_pnet_find_ism_resource(smc->clcsock->sk, ismdev); | |
494 | if (!(*ismdev)) | |
495 | return SMC_CLC_DECL_CNFERR; /* configuration error */ | |
496 | return 0; | |
497 | } | |
498 | ||
499 | /* Check for VLAN ID and register it on ISM device just for CLC handshake */ | |
500 | static int smc_connect_ism_vlan_setup(struct smc_sock *smc, | |
501 | struct smcd_dev *ismdev, | |
502 | unsigned short vlan_id) | |
503 | { | |
504 | if (vlan_id && smc_ism_get_vlan(ismdev, vlan_id)) | |
505 | return SMC_CLC_DECL_CNFERR; | |
506 | return 0; | |
507 | } | |
508 | ||
509 | /* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is | |
510 | * used, the VLAN ID will be registered again during the connection setup. | |
511 | */ | |
512 | static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc, bool is_smcd, | |
513 | struct smcd_dev *ismdev, | |
514 | unsigned short vlan_id) | |
515 | { | |
516 | if (!is_smcd) | |
517 | return 0; | |
518 | if (vlan_id && smc_ism_put_vlan(ismdev, vlan_id)) | |
519 | return SMC_CLC_DECL_CNFERR; | |
520 | return 0; | |
521 | } | |
522 | ||
3b2dec26 | 523 | /* CLC handshake during connect */ |
c758dfdd | 524 | static int smc_connect_clc(struct smc_sock *smc, int smc_type, |
3b2dec26 | 525 | struct smc_clc_msg_accept_confirm *aclc, |
41349844 | 526 | struct smc_ib_device *ibdev, u8 ibport, |
7005ada6 | 527 | u8 gid[], struct smcd_dev *ismdev) |
3b2dec26 HW |
528 | { |
529 | int rc = 0; | |
a046d57d UB |
530 | |
531 | /* do inband token exchange */ | |
7005ada6 | 532 | rc = smc_clc_send_proposal(smc, smc_type, ibdev, ibport, gid, ismdev); |
3b2dec26 HW |
533 | if (rc) |
534 | return rc; | |
a046d57d | 535 | /* receive SMC Accept CLC message */ |
3b2dec26 HW |
536 | return smc_clc_wait_msg(smc, aclc, sizeof(*aclc), SMC_CLC_ACCEPT); |
537 | } | |
538 | ||
539 | /* setup for RDMA connection of client */ | |
540 | static int smc_connect_rdma(struct smc_sock *smc, | |
541 | struct smc_clc_msg_accept_confirm *aclc, | |
542 | struct smc_ib_device *ibdev, u8 ibport) | |
543 | { | |
544 | int local_contact = SMC_FIRST_CONTACT; | |
545 | struct smc_link *link; | |
546 | int reason_code = 0; | |
a046d57d | 547 | |
0cfdd8f9 | 548 | mutex_lock(&smc_create_lgr_pending); |
c6ba7c9b HW |
549 | local_contact = smc_conn_create(smc, false, aclc->hdr.flag, ibdev, |
550 | ibport, &aclc->lcl, NULL, 0); | |
0cfdd8f9 | 551 | if (local_contact < 0) { |
3b2dec26 | 552 | if (local_contact == -ENOMEM) |
0cfdd8f9 | 553 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ |
3b2dec26 | 554 | else if (local_contact == -ENOLINK) |
0cfdd8f9 | 555 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ |
1401ea04 KG |
556 | else |
557 | reason_code = SMC_CLC_DECL_INTERR; /* other error */ | |
3b2dec26 | 558 | return smc_connect_abort(smc, reason_code, 0); |
0cfdd8f9 UB |
559 | } |
560 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 561 | |
3b2dec26 | 562 | smc_conn_save_peer_info(smc, aclc); |
cd6851f3 | 563 | |
3e034725 | 564 | /* create send buffer and rmb */ |
c6ba7c9b | 565 | if (smc_buf_create(smc, false)) |
3b2dec26 | 566 | return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); |
cd6851f3 | 567 | |
0cfdd8f9 | 568 | if (local_contact == SMC_FIRST_CONTACT) |
3b2dec26 | 569 | smc_link_save_peer_info(link, aclc); |
bd4ad577 | 570 | |
3b2dec26 | 571 | if (smc_rmb_rtoken_handling(&smc->conn, aclc)) |
603cc149 | 572 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RTOK, |
3b2dec26 | 573 | local_contact); |
bd4ad577 | 574 | |
46c28dbd UB |
575 | smc_close_init(smc); |
576 | smc_rx_init(smc); | |
577 | ||
bd4ad577 | 578 | if (local_contact == SMC_FIRST_CONTACT) { |
3b2dec26 | 579 | if (smc_ib_ready_link(link)) |
603cc149 | 580 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_RDYLNK, |
3b2dec26 | 581 | local_contact); |
652a1e41 | 582 | } else { |
3b2dec26 HW |
583 | if (!smc->conn.rmb_desc->reused && |
584 | smc_reg_rmb(link, smc->conn.rmb_desc, true)) | |
603cc149 | 585 | return smc_connect_abort(smc, SMC_CLC_DECL_ERR_REGRMB, |
3b2dec26 | 586 | local_contact); |
bd4ad577 | 587 | } |
10428dd8 | 588 | smc_rmb_sync_sg_for_device(&smc->conn); |
a046d57d | 589 | |
3b2dec26 HW |
590 | reason_code = smc_clc_send_confirm(smc); |
591 | if (reason_code) | |
592 | return smc_connect_abort(smc, reason_code, local_contact); | |
593 | ||
594 | smc_tx_init(smc); | |
a046d57d | 595 | |
9bf9abea UB |
596 | if (local_contact == SMC_FIRST_CONTACT) { |
597 | /* QP confirmation over RoCE fabric */ | |
0f627126 | 598 | reason_code = smc_clnt_conf_first_link(smc); |
3b2dec26 HW |
599 | if (reason_code) |
600 | return smc_connect_abort(smc, reason_code, | |
601 | local_contact); | |
9bf9abea | 602 | } |
0cfdd8f9 | 603 | mutex_unlock(&smc_create_lgr_pending); |
e6727f39 | 604 | |
a046d57d | 605 | smc_copy_sock_settings_to_clc(smc); |
b38d7324 UB |
606 | if (smc->sk.sk_state == SMC_INIT) |
607 | smc->sk.sk_state = SMC_ACTIVE; | |
a046d57d | 608 | |
3b2dec26 HW |
609 | return 0; |
610 | } | |
a046d57d | 611 | |
41349844 HW |
612 | /* setup for ISM connection of client */ |
613 | static int smc_connect_ism(struct smc_sock *smc, | |
614 | struct smc_clc_msg_accept_confirm *aclc, | |
615 | struct smcd_dev *ismdev) | |
616 | { | |
617 | int local_contact = SMC_FIRST_CONTACT; | |
618 | int rc = 0; | |
619 | ||
620 | mutex_lock(&smc_create_lgr_pending); | |
621 | local_contact = smc_conn_create(smc, true, aclc->hdr.flag, NULL, 0, | |
622 | NULL, ismdev, aclc->gid); | |
623 | if (local_contact < 0) | |
624 | return smc_connect_abort(smc, SMC_CLC_DECL_MEM, 0); | |
625 | ||
626 | /* Create send and receive buffers */ | |
627 | if (smc_buf_create(smc, true)) | |
628 | return smc_connect_abort(smc, SMC_CLC_DECL_MEM, local_contact); | |
629 | ||
630 | smc_conn_save_peer_info(smc, aclc); | |
631 | smc_close_init(smc); | |
632 | smc_rx_init(smc); | |
633 | smc_tx_init(smc); | |
634 | ||
635 | rc = smc_clc_send_confirm(smc); | |
636 | if (rc) | |
637 | return smc_connect_abort(smc, rc, local_contact); | |
638 | mutex_unlock(&smc_create_lgr_pending); | |
639 | ||
640 | smc_copy_sock_settings_to_clc(smc); | |
641 | if (smc->sk.sk_state == SMC_INIT) | |
642 | smc->sk.sk_state = SMC_ACTIVE; | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
3b2dec26 HW |
647 | /* perform steps before actually connecting */ |
648 | static int __smc_connect(struct smc_sock *smc) | |
649 | { | |
41349844 | 650 | bool ism_supported = false, rdma_supported = false; |
3b2dec26 HW |
651 | struct smc_clc_msg_accept_confirm aclc; |
652 | struct smc_ib_device *ibdev; | |
41349844 | 653 | struct smcd_dev *ismdev; |
7005ada6 | 654 | u8 gid[SMC_GID_SIZE]; |
41349844 HW |
655 | unsigned short vlan; |
656 | int smc_type; | |
3b2dec26 HW |
657 | int rc = 0; |
658 | u8 ibport; | |
a046d57d | 659 | |
3b2dec26 HW |
660 | sock_hold(&smc->sk); /* sock put in passive closing */ |
661 | ||
662 | if (smc->use_fallback) | |
603cc149 | 663 | return smc_connect_fallback(smc, smc->fallback_rsn); |
3b2dec26 HW |
664 | |
665 | /* if peer has not signalled SMC-capability, fall back */ | |
666 | if (!tcp_sk(smc->clcsock->sk)->syn_smc) | |
603cc149 | 667 | return smc_connect_fallback(smc, SMC_CLC_DECL_PEERNOSMC); |
3b2dec26 HW |
668 | |
669 | /* IPSec connections opt out of SMC-R optimizations */ | |
670 | if (using_ipsec(smc)) | |
671 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_IPSEC); | |
672 | ||
41349844 HW |
673 | /* check for VLAN ID */ |
674 | if (smc_vlan_by_tcpsk(smc->clcsock, &vlan)) | |
675 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_CNFERR); | |
676 | ||
677 | /* check if there is an ism device available */ | |
678 | if (!smc_check_ism(smc, &ismdev) && | |
679 | !smc_connect_ism_vlan_setup(smc, ismdev, vlan)) { | |
680 | /* ISM is supported for this connection */ | |
681 | ism_supported = true; | |
682 | smc_type = SMC_TYPE_D; | |
683 | } | |
684 | ||
685 | /* check if there is a rdma device available */ | |
7005ada6 | 686 | if (!smc_check_rdma(smc, &ibdev, &ibport, vlan, gid)) { |
41349844 HW |
687 | /* RDMA is supported for this connection */ |
688 | rdma_supported = true; | |
689 | if (ism_supported) | |
690 | smc_type = SMC_TYPE_B; /* both */ | |
691 | else | |
692 | smc_type = SMC_TYPE_R; /* only RDMA */ | |
693 | } | |
694 | ||
695 | /* if neither ISM nor RDMA are supported, fallback */ | |
696 | if (!rdma_supported && !ism_supported) | |
603cc149 | 697 | return smc_connect_decline_fallback(smc, SMC_CLC_DECL_NOSMCDEV); |
3b2dec26 HW |
698 | |
699 | /* perform CLC handshake */ | |
7005ada6 | 700 | rc = smc_connect_clc(smc, smc_type, &aclc, ibdev, ibport, gid, ismdev); |
41349844 HW |
701 | if (rc) { |
702 | smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); | |
3b2dec26 | 703 | return smc_connect_decline_fallback(smc, rc); |
41349844 | 704 | } |
3b2dec26 | 705 | |
41349844 HW |
706 | /* depending on previous steps, connect using rdma or ism */ |
707 | if (rdma_supported && aclc.hdr.path == SMC_TYPE_R) | |
708 | rc = smc_connect_rdma(smc, &aclc, ibdev, ibport); | |
709 | else if (ism_supported && aclc.hdr.path == SMC_TYPE_D) | |
710 | rc = smc_connect_ism(smc, &aclc, ismdev); | |
711 | else | |
603cc149 | 712 | rc = SMC_CLC_DECL_MODEUNSUPP; |
41349844 HW |
713 | if (rc) { |
714 | smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); | |
3b2dec26 | 715 | return smc_connect_decline_fallback(smc, rc); |
41349844 | 716 | } |
3b2dec26 | 717 | |
41349844 | 718 | smc_connect_ism_vlan_cleanup(smc, ism_supported, ismdev, vlan); |
3b2dec26 | 719 | return 0; |
a046d57d UB |
720 | } |
721 | ||
24ac3a08 UB |
722 | static void smc_connect_work(struct work_struct *work) |
723 | { | |
724 | struct smc_sock *smc = container_of(work, struct smc_sock, | |
725 | connect_work); | |
726 | int rc; | |
727 | ||
728 | lock_sock(&smc->sk); | |
729 | rc = kernel_connect(smc->clcsock, &smc->connect_info->addr, | |
730 | smc->connect_info->alen, smc->connect_info->flags); | |
731 | if (smc->clcsock->sk->sk_err) { | |
732 | smc->sk.sk_err = smc->clcsock->sk->sk_err; | |
733 | goto out; | |
734 | } | |
735 | if (rc < 0) { | |
736 | smc->sk.sk_err = -rc; | |
737 | goto out; | |
738 | } | |
739 | ||
740 | rc = __smc_connect(smc); | |
741 | if (rc < 0) | |
742 | smc->sk.sk_err = -rc; | |
743 | ||
744 | out: | |
648a5a7a UB |
745 | if (smc->sk.sk_err) |
746 | smc->sk.sk_state_change(&smc->sk); | |
747 | else | |
748 | smc->sk.sk_write_space(&smc->sk); | |
24ac3a08 UB |
749 | kfree(smc->connect_info); |
750 | smc->connect_info = NULL; | |
751 | release_sock(&smc->sk); | |
752 | } | |
753 | ||
ac713874 UB |
754 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
755 | int alen, int flags) | |
756 | { | |
757 | struct sock *sk = sock->sk; | |
758 | struct smc_sock *smc; | |
759 | int rc = -EINVAL; | |
760 | ||
761 | smc = smc_sk(sk); | |
762 | ||
763 | /* separate smc parameter checking to be safe */ | |
764 | if (alen < sizeof(addr->sa_family)) | |
765 | goto out_err; | |
aaa4d33f | 766 | if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) |
ac713874 UB |
767 | goto out_err; |
768 | ||
769 | lock_sock(sk); | |
770 | switch (sk->sk_state) { | |
771 | default: | |
772 | goto out; | |
773 | case SMC_ACTIVE: | |
774 | rc = -EISCONN; | |
775 | goto out; | |
776 | case SMC_INIT: | |
777 | rc = 0; | |
778 | break; | |
779 | } | |
780 | ||
781 | smc_copy_sock_settings_to_clc(smc); | |
c5c1cc9c | 782 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; |
24ac3a08 UB |
783 | if (flags & O_NONBLOCK) { |
784 | if (smc->connect_info) { | |
785 | rc = -EALREADY; | |
786 | goto out; | |
787 | } | |
788 | smc->connect_info = kzalloc(alen + 2 * sizeof(int), GFP_KERNEL); | |
789 | if (!smc->connect_info) { | |
790 | rc = -ENOMEM; | |
791 | goto out; | |
792 | } | |
793 | smc->connect_info->alen = alen; | |
794 | smc->connect_info->flags = flags ^ O_NONBLOCK; | |
795 | memcpy(&smc->connect_info->addr, addr, alen); | |
796 | schedule_work(&smc->connect_work); | |
797 | rc = -EINPROGRESS; | |
798 | } else { | |
799 | rc = kernel_connect(smc->clcsock, addr, alen, flags); | |
800 | if (rc) | |
801 | goto out; | |
ac713874 | 802 | |
24ac3a08 UB |
803 | rc = __smc_connect(smc); |
804 | if (rc < 0) | |
805 | goto out; | |
806 | else | |
807 | rc = 0; /* success cases including fallback */ | |
808 | } | |
ac713874 UB |
809 | |
810 | out: | |
811 | release_sock(sk); | |
812 | out_err: | |
813 | return rc; | |
814 | } | |
815 | ||
816 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
817 | { | |
3163c507 UB |
818 | struct socket *new_clcsock = NULL; |
819 | struct sock *lsk = &lsmc->sk; | |
ac713874 UB |
820 | struct sock *new_sk; |
821 | int rc; | |
822 | ||
3163c507 | 823 | release_sock(lsk); |
aaa4d33f | 824 | new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); |
ac713874 UB |
825 | if (!new_sk) { |
826 | rc = -ENOMEM; | |
3163c507 | 827 | lsk->sk_err = ENOMEM; |
ac713874 | 828 | *new_smc = NULL; |
3163c507 | 829 | lock_sock(lsk); |
ac713874 UB |
830 | goto out; |
831 | } | |
832 | *new_smc = smc_sk(new_sk); | |
833 | ||
834 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
3163c507 | 835 | lock_sock(lsk); |
35a6b178 | 836 | if (rc < 0) |
3163c507 | 837 | lsk->sk_err = -rc; |
35a6b178 | 838 | if (rc < 0 || lsk->sk_state == SMC_CLOSED) { |
a046d57d UB |
839 | if (new_clcsock) |
840 | sock_release(new_clcsock); | |
841 | new_sk->sk_state = SMC_CLOSED; | |
842 | sock_set_flag(new_sk, SOCK_DEAD); | |
3163c507 | 843 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 844 | sock_put(new_sk); /* final */ |
ac713874 UB |
845 | *new_smc = NULL; |
846 | goto out; | |
847 | } | |
848 | ||
849 | (*new_smc)->clcsock = new_clcsock; | |
850 | out: | |
851 | return rc; | |
852 | } | |
853 | ||
a046d57d UB |
854 | /* add a just created sock to the accept queue of the listen sock as |
855 | * candidate for a following socket accept call from user space | |
856 | */ | |
857 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
858 | { | |
859 | struct smc_sock *par = smc_sk(parent); | |
860 | ||
51f1de79 | 861 | sock_hold(sk); /* sock_put in smc_accept_unlink () */ |
a046d57d UB |
862 | spin_lock(&par->accept_q_lock); |
863 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
864 | spin_unlock(&par->accept_q_lock); | |
865 | sk_acceptq_added(parent); | |
866 | } | |
867 | ||
868 | /* remove a socket from the accept queue of its parental listening socket */ | |
869 | static void smc_accept_unlink(struct sock *sk) | |
870 | { | |
871 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
872 | ||
873 | spin_lock(&par->accept_q_lock); | |
874 | list_del_init(&smc_sk(sk)->accept_q); | |
875 | spin_unlock(&par->accept_q_lock); | |
876 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
51f1de79 | 877 | sock_put(sk); /* sock_hold in smc_accept_enqueue */ |
a046d57d UB |
878 | } |
879 | ||
880 | /* remove a sock from the accept queue to bind it to a new socket created | |
881 | * for a socket accept call from user space | |
882 | */ | |
b38d7324 UB |
883 | struct sock *smc_accept_dequeue(struct sock *parent, |
884 | struct socket *new_sock) | |
a046d57d UB |
885 | { |
886 | struct smc_sock *isk, *n; | |
887 | struct sock *new_sk; | |
888 | ||
889 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
890 | new_sk = (struct sock *)isk; | |
891 | ||
892 | smc_accept_unlink(new_sk); | |
893 | if (new_sk->sk_state == SMC_CLOSED) { | |
127f4970 UB |
894 | if (isk->clcsock) { |
895 | sock_release(isk->clcsock); | |
896 | isk->clcsock = NULL; | |
897 | } | |
288c8390 | 898 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 899 | sock_put(new_sk); /* final */ |
a046d57d UB |
900 | continue; |
901 | } | |
902 | if (new_sock) | |
903 | sock_graft(new_sk, new_sock); | |
904 | return new_sk; | |
905 | } | |
906 | return NULL; | |
907 | } | |
908 | ||
909 | /* clean up for a created but never accepted sock */ | |
b38d7324 | 910 | void smc_close_non_accepted(struct sock *sk) |
a046d57d UB |
911 | { |
912 | struct smc_sock *smc = smc_sk(sk); | |
913 | ||
b38d7324 UB |
914 | lock_sock(sk); |
915 | if (!sk->sk_lingertime) | |
916 | /* wait for peer closing */ | |
917 | sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; | |
51f1de79 | 918 | if (!smc->use_fallback) { |
b38d7324 | 919 | smc_close_active(smc); |
288c8390 UB |
920 | sock_set_flag(sk, SOCK_DEAD); |
921 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
922 | } | |
a046d57d UB |
923 | if (smc->clcsock) { |
924 | struct socket *tcp; | |
925 | ||
926 | tcp = smc->clcsock; | |
927 | smc->clcsock = NULL; | |
928 | sock_release(tcp); | |
929 | } | |
b38d7324 | 930 | if (smc->use_fallback) { |
51f1de79 UB |
931 | sock_put(sk); /* passive closing */ |
932 | sk->sk_state = SMC_CLOSED; | |
933 | } else { | |
934 | if (sk->sk_state == SMC_CLOSED) | |
935 | smc_conn_free(&smc->conn); | |
b38d7324 UB |
936 | } |
937 | release_sock(sk); | |
51f1de79 UB |
938 | sk->sk_prot->unhash(sk); |
939 | sock_put(sk); /* final sock_put */ | |
a046d57d UB |
940 | } |
941 | ||
9bf9abea UB |
942 | static int smc_serv_conf_first_link(struct smc_sock *smc) |
943 | { | |
877ae5be | 944 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
945 | struct smc_link_group *lgr = smc->conn.lgr; |
946 | struct smc_link *link; | |
947 | int rest; | |
948 | int rc; | |
949 | ||
950 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
652a1e41 | 951 | |
44aa81ce | 952 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
603cc149 | 953 | return SMC_CLC_DECL_ERR_REGRMB; |
652a1e41 | 954 | |
9bf9abea | 955 | /* send CONFIRM LINK request to client over the RoCE fabric */ |
947541f3 | 956 | rc = smc_llc_send_confirm_link(link, SMC_LLC_REQ); |
9bf9abea | 957 | if (rc < 0) |
603cc149 | 958 | return SMC_CLC_DECL_TIMEOUT_CL; |
9bf9abea UB |
959 | |
960 | /* receive CONFIRM LINK response from client over the RoCE fabric */ | |
961 | rest = wait_for_completion_interruptible_timeout( | |
962 | &link->llc_confirm_resp, | |
963 | SMC_LLC_WAIT_FIRST_TIME); | |
964 | if (rest <= 0) { | |
965 | struct smc_clc_msg_decline dclc; | |
966 | ||
967 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
968 | SMC_CLC_DECLINE); | |
75d320d6 | 969 | return rc; |
9bf9abea UB |
970 | } |
971 | ||
75d320d6 KG |
972 | if (link->llc_confirm_resp_rc) |
973 | return SMC_CLC_DECL_RMBE_EC; | |
974 | ||
52bedf37 KG |
975 | /* send ADD LINK request to client over the RoCE fabric */ |
976 | rc = smc_llc_send_add_link(link, | |
977 | link->smcibdev->mac[link->ibport - 1], | |
7005ada6 | 978 | link->gid, SMC_LLC_REQ); |
52bedf37 | 979 | if (rc < 0) |
603cc149 | 980 | return SMC_CLC_DECL_TIMEOUT_AL; |
52bedf37 KG |
981 | |
982 | /* receive ADD LINK response from client over the RoCE fabric */ | |
983 | rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, | |
984 | SMC_LLC_WAIT_TIME); | |
985 | if (rest <= 0) { | |
986 | struct smc_clc_msg_decline dclc; | |
987 | ||
988 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
989 | SMC_CLC_DECLINE); | |
990 | return rc; | |
991 | } | |
992 | ||
877ae5be | 993 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 994 | |
75d320d6 | 995 | return 0; |
9bf9abea UB |
996 | } |
997 | ||
3b2dec26 HW |
998 | /* listen worker: finish */ |
999 | static void smc_listen_out(struct smc_sock *new_smc) | |
a046d57d | 1000 | { |
a046d57d | 1001 | struct smc_sock *lsmc = new_smc->listen_smc; |
a046d57d | 1002 | struct sock *newsmcsk = &new_smc->sk; |
a046d57d | 1003 | |
3b2dec26 HW |
1004 | lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); |
1005 | if (lsmc->sk.sk_state == SMC_LISTEN) { | |
1006 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
1007 | } else { /* no longer listening */ | |
1008 | smc_close_non_accepted(newsmcsk); | |
c5c1cc9c | 1009 | } |
3b2dec26 | 1010 | release_sock(&lsmc->sk); |
c5c1cc9c | 1011 | |
3b2dec26 HW |
1012 | /* Wake up accept */ |
1013 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
1014 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
1015 | } | |
a046d57d | 1016 | |
3b2dec26 HW |
1017 | /* listen worker: finish in state connected */ |
1018 | static void smc_listen_out_connected(struct smc_sock *new_smc) | |
1019 | { | |
1020 | struct sock *newsmcsk = &new_smc->sk; | |
a046d57d | 1021 | |
3b2dec26 HW |
1022 | sk_refcnt_debug_inc(newsmcsk); |
1023 | if (newsmcsk->sk_state == SMC_INIT) | |
1024 | newsmcsk->sk_state = SMC_ACTIVE; | |
1025 | ||
1026 | smc_listen_out(new_smc); | |
1027 | } | |
1028 | ||
1029 | /* listen worker: finish in error state */ | |
1030 | static void smc_listen_out_err(struct smc_sock *new_smc) | |
1031 | { | |
1032 | struct sock *newsmcsk = &new_smc->sk; | |
1033 | ||
1034 | if (newsmcsk->sk_state == SMC_INIT) | |
1035 | sock_put(&new_smc->sk); /* passive closing */ | |
1036 | newsmcsk->sk_state = SMC_CLOSED; | |
1037 | smc_conn_free(&new_smc->conn); | |
1038 | ||
1039 | smc_listen_out(new_smc); | |
1040 | } | |
1041 | ||
1042 | /* listen worker: decline and fall back if possible */ | |
1043 | static void smc_listen_decline(struct smc_sock *new_smc, int reason_code, | |
1044 | int local_contact) | |
1045 | { | |
1046 | /* RDMA setup failed, switch back to TCP */ | |
1047 | if (local_contact == SMC_FIRST_CONTACT) | |
1048 | smc_lgr_forget(new_smc->conn.lgr); | |
1049 | if (reason_code < 0) { /* error, no fallback possible */ | |
1050 | smc_listen_out_err(new_smc); | |
1051 | return; | |
1052 | } | |
1053 | smc_conn_free(&new_smc->conn); | |
1054 | new_smc->use_fallback = true; | |
603cc149 KG |
1055 | new_smc->fallback_rsn = reason_code; |
1056 | if (reason_code && reason_code != SMC_CLC_DECL_PEERDECL) { | |
3b2dec26 HW |
1057 | if (smc_clc_send_decline(new_smc, reason_code) < 0) { |
1058 | smc_listen_out_err(new_smc); | |
1059 | return; | |
1060 | } | |
a046d57d | 1061 | } |
3b2dec26 HW |
1062 | smc_listen_out_connected(new_smc); |
1063 | } | |
1064 | ||
1065 | /* listen worker: check prefixes */ | |
1066 | static int smc_listen_rdma_check(struct smc_sock *new_smc, | |
1067 | struct smc_clc_msg_proposal *pclc) | |
1068 | { | |
1069 | struct smc_clc_msg_proposal_prefix *pclc_prfx; | |
1070 | struct socket *newclcsock = new_smc->clcsock; | |
a046d57d | 1071 | |
e7b7a64a | 1072 | pclc_prfx = smc_clc_proposal_get_prefix(pclc); |
3b2dec26 HW |
1073 | if (smc_clc_prfx_match(newclcsock, pclc_prfx)) |
1074 | return SMC_CLC_DECL_CNFERR; | |
c246d942 | 1075 | |
3b2dec26 HW |
1076 | return 0; |
1077 | } | |
a046d57d | 1078 | |
3b2dec26 HW |
1079 | /* listen worker: initialize connection and buffers */ |
1080 | static int smc_listen_rdma_init(struct smc_sock *new_smc, | |
1081 | struct smc_clc_msg_proposal *pclc, | |
1082 | struct smc_ib_device *ibdev, u8 ibport, | |
1083 | int *local_contact) | |
1084 | { | |
0cfdd8f9 | 1085 | /* allocate connection / link group */ |
c6ba7c9b HW |
1086 | *local_contact = smc_conn_create(new_smc, false, 0, ibdev, ibport, |
1087 | &pclc->lcl, NULL, 0); | |
3b2dec26 HW |
1088 | if (*local_contact < 0) { |
1089 | if (*local_contact == -ENOMEM) | |
1090 | return SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
1091 | return SMC_CLC_DECL_INTERR; /* other error */ | |
0cfdd8f9 | 1092 | } |
a046d57d | 1093 | |
3e034725 | 1094 | /* create send buffer and rmb */ |
c6ba7c9b | 1095 | if (smc_buf_create(new_smc, false)) |
3b2dec26 | 1096 | return SMC_CLC_DECL_MEM; |
a046d57d | 1097 | |
3b2dec26 HW |
1098 | return 0; |
1099 | } | |
1100 | ||
41349844 HW |
1101 | /* listen worker: initialize connection and buffers for SMC-D */ |
1102 | static int smc_listen_ism_init(struct smc_sock *new_smc, | |
1103 | struct smc_clc_msg_proposal *pclc, | |
1104 | struct smcd_dev *ismdev, | |
1105 | int *local_contact) | |
1106 | { | |
1107 | struct smc_clc_msg_smcd *pclc_smcd; | |
1108 | ||
1109 | pclc_smcd = smc_get_clc_msg_smcd(pclc); | |
1110 | *local_contact = smc_conn_create(new_smc, true, 0, NULL, 0, NULL, | |
1111 | ismdev, pclc_smcd->gid); | |
1112 | if (*local_contact < 0) { | |
1113 | if (*local_contact == -ENOMEM) | |
1114 | return SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
1115 | return SMC_CLC_DECL_INTERR; /* other error */ | |
1116 | } | |
1117 | ||
1118 | /* Check if peer can be reached via ISM device */ | |
1119 | if (smc_ism_cantalk(new_smc->conn.lgr->peer_gid, | |
1120 | new_smc->conn.lgr->vlan_id, | |
1121 | new_smc->conn.lgr->smcd)) { | |
1122 | if (*local_contact == SMC_FIRST_CONTACT) | |
1123 | smc_lgr_forget(new_smc->conn.lgr); | |
1124 | smc_conn_free(&new_smc->conn); | |
1125 | return SMC_CLC_DECL_CNFERR; | |
1126 | } | |
1127 | ||
1128 | /* Create send and receive buffers */ | |
1129 | if (smc_buf_create(new_smc, true)) { | |
1130 | if (*local_contact == SMC_FIRST_CONTACT) | |
1131 | smc_lgr_forget(new_smc->conn.lgr); | |
1132 | smc_conn_free(&new_smc->conn); | |
1133 | return SMC_CLC_DECL_MEM; | |
1134 | } | |
1135 | ||
1136 | return 0; | |
1137 | } | |
1138 | ||
3b2dec26 HW |
1139 | /* listen worker: register buffers */ |
1140 | static int smc_listen_rdma_reg(struct smc_sock *new_smc, int local_contact) | |
1141 | { | |
1142 | struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
46c28dbd | 1143 | |
652a1e41 | 1144 | if (local_contact != SMC_FIRST_CONTACT) { |
e63a5f8c | 1145 | if (!new_smc->conn.rmb_desc->reused) { |
3b2dec26 | 1146 | if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) |
603cc149 | 1147 | return SMC_CLC_DECL_ERR_REGRMB; |
652a1e41 UB |
1148 | } |
1149 | } | |
10428dd8 | 1150 | smc_rmb_sync_sg_for_device(&new_smc->conn); |
652a1e41 | 1151 | |
3b2dec26 HW |
1152 | return 0; |
1153 | } | |
1154 | ||
1155 | /* listen worker: finish RDMA setup */ | |
1ca52fcf UB |
1156 | static int smc_listen_rdma_finish(struct smc_sock *new_smc, |
1157 | struct smc_clc_msg_accept_confirm *cclc, | |
1158 | int local_contact) | |
3b2dec26 HW |
1159 | { |
1160 | struct smc_link *link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
1161 | int reason_code = 0; | |
a046d57d | 1162 | |
0cfdd8f9 | 1163 | if (local_contact == SMC_FIRST_CONTACT) |
3b2dec26 | 1164 | smc_link_save_peer_info(link, cclc); |
a046d57d | 1165 | |
3b2dec26 | 1166 | if (smc_rmb_rtoken_handling(&new_smc->conn, cclc)) { |
603cc149 | 1167 | reason_code = SMC_CLC_DECL_ERR_RTOK; |
3b2dec26 | 1168 | goto decline; |
bd4ad577 UB |
1169 | } |
1170 | ||
bd4ad577 | 1171 | if (local_contact == SMC_FIRST_CONTACT) { |
3b2dec26 | 1172 | if (smc_ib_ready_link(link)) { |
603cc149 | 1173 | reason_code = SMC_CLC_DECL_ERR_RDYLNK; |
3b2dec26 | 1174 | goto decline; |
bd4ad577 | 1175 | } |
9bf9abea UB |
1176 | /* QP confirmation over RoCE fabric */ |
1177 | reason_code = smc_serv_conf_first_link(new_smc); | |
3b2dec26 HW |
1178 | if (reason_code) |
1179 | goto decline; | |
bd4ad577 | 1180 | } |
1ca52fcf | 1181 | return 0; |
a046d57d | 1182 | |
3b2dec26 | 1183 | decline: |
145686ba | 1184 | mutex_unlock(&smc_create_lgr_pending); |
3b2dec26 | 1185 | smc_listen_decline(new_smc, reason_code, local_contact); |
1ca52fcf | 1186 | return reason_code; |
3b2dec26 | 1187 | } |
e6727f39 | 1188 | |
3b2dec26 HW |
1189 | /* setup for RDMA connection of server */ |
1190 | static void smc_listen_work(struct work_struct *work) | |
1191 | { | |
1192 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
1193 | smc_listen_work); | |
1194 | struct socket *newclcsock = new_smc->clcsock; | |
1195 | struct smc_clc_msg_accept_confirm cclc; | |
1196 | struct smc_clc_msg_proposal *pclc; | |
1197 | struct smc_ib_device *ibdev; | |
41349844 HW |
1198 | bool ism_supported = false; |
1199 | struct smcd_dev *ismdev; | |
3b2dec26 HW |
1200 | u8 buf[SMC_CLC_MAX_LEN]; |
1201 | int local_contact = 0; | |
7005ada6 | 1202 | unsigned short vlan; |
3b2dec26 HW |
1203 | int reason_code = 0; |
1204 | int rc = 0; | |
1205 | u8 ibport; | |
1206 | ||
1207 | if (new_smc->use_fallback) { | |
1208 | smc_listen_out_connected(new_smc); | |
1209 | return; | |
a046d57d | 1210 | } |
a046d57d | 1211 | |
3b2dec26 HW |
1212 | /* check if peer is smc capable */ |
1213 | if (!tcp_sk(newclcsock->sk)->syn_smc) { | |
1214 | new_smc->use_fallback = true; | |
603cc149 | 1215 | new_smc->fallback_rsn = SMC_CLC_DECL_PEERNOSMC; |
3b2dec26 HW |
1216 | smc_listen_out_connected(new_smc); |
1217 | return; | |
1218 | } | |
a046d57d | 1219 | |
3b2dec26 HW |
1220 | /* do inband token exchange - |
1221 | * wait for and receive SMC Proposal CLC message | |
1222 | */ | |
1223 | pclc = (struct smc_clc_msg_proposal *)&buf; | |
1224 | reason_code = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN, | |
1225 | SMC_CLC_PROPOSAL); | |
1226 | if (reason_code) { | |
1227 | smc_listen_decline(new_smc, reason_code, 0); | |
1228 | return; | |
a046d57d | 1229 | } |
a046d57d | 1230 | |
3b2dec26 HW |
1231 | /* IPSec connections opt out of SMC-R optimizations */ |
1232 | if (using_ipsec(new_smc)) { | |
1233 | smc_listen_decline(new_smc, SMC_CLC_DECL_IPSEC, 0); | |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | mutex_lock(&smc_create_lgr_pending); | |
1238 | smc_close_init(new_smc); | |
1239 | smc_rx_init(new_smc); | |
1240 | smc_tx_init(new_smc); | |
1241 | ||
41349844 HW |
1242 | /* check if ISM is available */ |
1243 | if ((pclc->hdr.path == SMC_TYPE_D || pclc->hdr.path == SMC_TYPE_B) && | |
1244 | !smc_check_ism(new_smc, &ismdev) && | |
1245 | !smc_listen_ism_init(new_smc, pclc, ismdev, &local_contact)) { | |
1246 | ism_supported = true; | |
1247 | } | |
1248 | ||
3b2dec26 | 1249 | /* check if RDMA is available */ |
41349844 HW |
1250 | if (!ism_supported && |
1251 | ((pclc->hdr.path != SMC_TYPE_R && pclc->hdr.path != SMC_TYPE_B) || | |
7005ada6 UB |
1252 | smc_vlan_by_tcpsk(new_smc->clcsock, &vlan) || |
1253 | smc_check_rdma(new_smc, &ibdev, &ibport, vlan, NULL) || | |
41349844 HW |
1254 | smc_listen_rdma_check(new_smc, pclc) || |
1255 | smc_listen_rdma_init(new_smc, pclc, ibdev, ibport, | |
1256 | &local_contact) || | |
1257 | smc_listen_rdma_reg(new_smc, local_contact))) { | |
3b2dec26 HW |
1258 | /* SMC not supported, decline */ |
1259 | mutex_unlock(&smc_create_lgr_pending); | |
603cc149 KG |
1260 | smc_listen_decline(new_smc, SMC_CLC_DECL_MODEUNSUPP, |
1261 | local_contact); | |
3b2dec26 HW |
1262 | return; |
1263 | } | |
1264 | ||
1265 | /* send SMC Accept CLC message */ | |
1266 | rc = smc_clc_send_accept(new_smc, local_contact); | |
1267 | if (rc) { | |
1268 | mutex_unlock(&smc_create_lgr_pending); | |
1269 | smc_listen_decline(new_smc, rc, local_contact); | |
1270 | return; | |
1271 | } | |
1272 | ||
1273 | /* receive SMC Confirm CLC message */ | |
1274 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
1275 | SMC_CLC_CONFIRM); | |
1276 | if (reason_code) { | |
1277 | mutex_unlock(&smc_create_lgr_pending); | |
1278 | smc_listen_decline(new_smc, reason_code, local_contact); | |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | /* finish worker */ | |
1ca52fcf UB |
1283 | if (!ism_supported) { |
1284 | if (smc_listen_rdma_finish(new_smc, &cclc, local_contact)) | |
1285 | return; | |
1286 | } | |
3b2dec26 | 1287 | smc_conn_save_peer_info(new_smc, &cclc); |
145686ba | 1288 | mutex_unlock(&smc_create_lgr_pending); |
3b2dec26 | 1289 | smc_listen_out_connected(new_smc); |
a046d57d UB |
1290 | } |
1291 | ||
1292 | static void smc_tcp_listen_work(struct work_struct *work) | |
1293 | { | |
1294 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
1295 | tcp_listen_work); | |
3163c507 | 1296 | struct sock *lsk = &lsmc->sk; |
a046d57d UB |
1297 | struct smc_sock *new_smc; |
1298 | int rc = 0; | |
1299 | ||
3163c507 UB |
1300 | lock_sock(lsk); |
1301 | while (lsk->sk_state == SMC_LISTEN) { | |
a046d57d UB |
1302 | rc = smc_clcsock_accept(lsmc, &new_smc); |
1303 | if (rc) | |
1304 | goto out; | |
1305 | if (!new_smc) | |
1306 | continue; | |
1307 | ||
1308 | new_smc->listen_smc = lsmc; | |
ee9dfbef | 1309 | new_smc->use_fallback = lsmc->use_fallback; |
603cc149 | 1310 | new_smc->fallback_rsn = lsmc->fallback_rsn; |
3163c507 | 1311 | sock_hold(lsk); /* sock_put in smc_listen_work */ |
a046d57d UB |
1312 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); |
1313 | smc_copy_sock_settings_to_smc(new_smc); | |
bd58c7e0 UB |
1314 | new_smc->sk.sk_sndbuf = lsmc->sk.sk_sndbuf; |
1315 | new_smc->sk.sk_rcvbuf = lsmc->sk.sk_rcvbuf; | |
51f1de79 UB |
1316 | sock_hold(&new_smc->sk); /* sock_put in passive closing */ |
1317 | if (!schedule_work(&new_smc->smc_listen_work)) | |
1318 | sock_put(&new_smc->sk); | |
a046d57d UB |
1319 | } |
1320 | ||
1321 | out: | |
3163c507 | 1322 | release_sock(lsk); |
51f1de79 | 1323 | sock_put(&lsmc->sk); /* sock_hold in smc_listen */ |
a046d57d UB |
1324 | } |
1325 | ||
ac713874 UB |
1326 | static int smc_listen(struct socket *sock, int backlog) |
1327 | { | |
1328 | struct sock *sk = sock->sk; | |
1329 | struct smc_sock *smc; | |
1330 | int rc; | |
1331 | ||
1332 | smc = smc_sk(sk); | |
1333 | lock_sock(sk); | |
1334 | ||
1335 | rc = -EINVAL; | |
1336 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
1337 | goto out; | |
1338 | ||
1339 | rc = 0; | |
1340 | if (sk->sk_state == SMC_LISTEN) { | |
1341 | sk->sk_max_ack_backlog = backlog; | |
1342 | goto out; | |
1343 | } | |
1344 | /* some socket options are handled in core, so we could not apply | |
1345 | * them to the clc socket -- copy smc socket options to clc socket | |
1346 | */ | |
1347 | smc_copy_sock_settings_to_clc(smc); | |
ee9dfbef UB |
1348 | if (!smc->use_fallback) |
1349 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; | |
ac713874 UB |
1350 | |
1351 | rc = kernel_listen(smc->clcsock, backlog); | |
1352 | if (rc) | |
1353 | goto out; | |
1354 | sk->sk_max_ack_backlog = backlog; | |
1355 | sk->sk_ack_backlog = 0; | |
1356 | sk->sk_state = SMC_LISTEN; | |
a046d57d | 1357 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
51f1de79 UB |
1358 | sock_hold(sk); /* sock_hold in tcp_listen_worker */ |
1359 | if (!schedule_work(&smc->tcp_listen_work)) | |
1360 | sock_put(sk); | |
ac713874 UB |
1361 | |
1362 | out: | |
1363 | release_sock(sk); | |
1364 | return rc; | |
1365 | } | |
1366 | ||
1367 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
cdfbabfb | 1368 | int flags, bool kern) |
ac713874 | 1369 | { |
a046d57d UB |
1370 | struct sock *sk = sock->sk, *nsk; |
1371 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 1372 | struct smc_sock *lsmc; |
a046d57d UB |
1373 | long timeo; |
1374 | int rc = 0; | |
ac713874 UB |
1375 | |
1376 | lsmc = smc_sk(sk); | |
51f1de79 | 1377 | sock_hold(sk); /* sock_put below */ |
ac713874 UB |
1378 | lock_sock(sk); |
1379 | ||
1380 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
1381 | rc = -EINVAL; | |
abb190f1 | 1382 | release_sock(sk); |
ac713874 UB |
1383 | goto out; |
1384 | } | |
1385 | ||
a046d57d UB |
1386 | /* Wait for an incoming connection */ |
1387 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1388 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
1389 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
1390 | set_current_state(TASK_INTERRUPTIBLE); | |
1391 | if (!timeo) { | |
1392 | rc = -EAGAIN; | |
1393 | break; | |
1394 | } | |
1395 | release_sock(sk); | |
1396 | timeo = schedule_timeout(timeo); | |
1397 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
1398 | sched_annotate_sleep(); | |
1399 | lock_sock(sk); | |
1400 | if (signal_pending(current)) { | |
1401 | rc = sock_intr_errno(timeo); | |
1402 | break; | |
1403 | } | |
1404 | } | |
1405 | set_current_state(TASK_RUNNING); | |
1406 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 1407 | |
a046d57d UB |
1408 | if (!rc) |
1409 | rc = sock_error(nsk); | |
abb190f1 UB |
1410 | release_sock(sk); |
1411 | if (rc) | |
1412 | goto out; | |
1413 | ||
1414 | if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { | |
1415 | /* wait till data arrives on the socket */ | |
1416 | timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * | |
1417 | MSEC_PER_SEC); | |
1418 | if (smc_sk(nsk)->use_fallback) { | |
1419 | struct sock *clcsk = smc_sk(nsk)->clcsock->sk; | |
1420 | ||
1421 | lock_sock(clcsk); | |
1422 | if (skb_queue_empty(&clcsk->sk_receive_queue)) | |
1423 | sk_wait_data(clcsk, &timeo, NULL); | |
1424 | release_sock(clcsk); | |
1425 | } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { | |
1426 | lock_sock(nsk); | |
b51fa1b1 | 1427 | smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); |
abb190f1 UB |
1428 | release_sock(nsk); |
1429 | } | |
1430 | } | |
ac713874 UB |
1431 | |
1432 | out: | |
51f1de79 | 1433 | sock_put(sk); /* sock_hold above */ |
ac713874 UB |
1434 | return rc; |
1435 | } | |
1436 | ||
1437 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
9b2c45d4 | 1438 | int peer) |
ac713874 UB |
1439 | { |
1440 | struct smc_sock *smc; | |
1441 | ||
b38d7324 UB |
1442 | if (peer && (sock->sk->sk_state != SMC_ACTIVE) && |
1443 | (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) | |
ac713874 UB |
1444 | return -ENOTCONN; |
1445 | ||
1446 | smc = smc_sk(sock->sk); | |
1447 | ||
9b2c45d4 | 1448 | return smc->clcsock->ops->getname(smc->clcsock, addr, peer); |
ac713874 UB |
1449 | } |
1450 | ||
1451 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
1452 | { | |
1453 | struct sock *sk = sock->sk; | |
1454 | struct smc_sock *smc; | |
1455 | int rc = -EPIPE; | |
1456 | ||
1457 | smc = smc_sk(sk); | |
1458 | lock_sock(sk); | |
b38d7324 UB |
1459 | if ((sk->sk_state != SMC_ACTIVE) && |
1460 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1461 | (sk->sk_state != SMC_INIT)) | |
ac713874 | 1462 | goto out; |
ee9dfbef UB |
1463 | |
1464 | if (msg->msg_flags & MSG_FASTOPEN) { | |
1465 | if (sk->sk_state == SMC_INIT) { | |
1466 | smc->use_fallback = true; | |
603cc149 | 1467 | smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; |
ee9dfbef UB |
1468 | } else { |
1469 | rc = -EINVAL; | |
1470 | goto out; | |
1471 | } | |
1472 | } | |
1473 | ||
ac713874 UB |
1474 | if (smc->use_fallback) |
1475 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
1476 | else | |
e6727f39 | 1477 | rc = smc_tx_sendmsg(smc, msg, len); |
ac713874 UB |
1478 | out: |
1479 | release_sock(sk); | |
1480 | return rc; | |
1481 | } | |
1482 | ||
1483 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
1484 | int flags) | |
1485 | { | |
1486 | struct sock *sk = sock->sk; | |
1487 | struct smc_sock *smc; | |
1488 | int rc = -ENOTCONN; | |
1489 | ||
1490 | smc = smc_sk(sk); | |
1491 | lock_sock(sk); | |
b38d7324 UB |
1492 | if ((sk->sk_state == SMC_INIT) || |
1493 | (sk->sk_state == SMC_LISTEN) || | |
1494 | (sk->sk_state == SMC_CLOSED)) | |
ac713874 UB |
1495 | goto out; |
1496 | ||
b38d7324 UB |
1497 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { |
1498 | rc = 0; | |
1499 | goto out; | |
1500 | } | |
1501 | ||
9014db20 | 1502 | if (smc->use_fallback) { |
ac713874 | 1503 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); |
9014db20 SR |
1504 | } else { |
1505 | msg->msg_namelen = 0; | |
1506 | rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); | |
1507 | } | |
b38d7324 | 1508 | |
ac713874 UB |
1509 | out: |
1510 | release_sock(sk); | |
1511 | return rc; | |
1512 | } | |
1513 | ||
ade994f4 | 1514 | static __poll_t smc_accept_poll(struct sock *parent) |
a046d57d | 1515 | { |
8dce2786 | 1516 | struct smc_sock *isk = smc_sk(parent); |
63e2480c | 1517 | __poll_t mask = 0; |
a046d57d | 1518 | |
8dce2786 UB |
1519 | spin_lock(&isk->accept_q_lock); |
1520 | if (!list_empty(&isk->accept_q)) | |
a9a08845 | 1521 | mask = EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1522 | spin_unlock(&isk->accept_q_lock); |
a046d57d | 1523 | |
8dce2786 | 1524 | return mask; |
a046d57d UB |
1525 | } |
1526 | ||
a11e1d43 LT |
1527 | static __poll_t smc_poll(struct file *file, struct socket *sock, |
1528 | poll_table *wait) | |
ac713874 UB |
1529 | { |
1530 | struct sock *sk = sock->sk; | |
e6c8adca | 1531 | __poll_t mask = 0; |
ac713874 UB |
1532 | struct smc_sock *smc; |
1533 | ||
8dce2786 | 1534 | if (!sk) |
a9a08845 | 1535 | return EPOLLNVAL; |
8dce2786 | 1536 | |
ac713874 | 1537 | smc = smc_sk(sock->sk); |
648a5a7a | 1538 | if (smc->use_fallback) { |
a046d57d | 1539 | /* delegate to CLC child sock */ |
a11e1d43 | 1540 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
784813ae | 1541 | sk->sk_err = smc->clcsock->sk->sk_err; |
24ac3a08 | 1542 | if (sk->sk_err) |
784813ae | 1543 | mask |= EPOLLERR; |
ac713874 | 1544 | } else { |
410da1e1 | 1545 | if (sk->sk_state != SMC_CLOSED) |
89ab066d | 1546 | sock_poll_wait(file, sock, wait); |
a046d57d | 1547 | if (sk->sk_err) |
a9a08845 | 1548 | mask |= EPOLLERR; |
b38d7324 UB |
1549 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || |
1550 | (sk->sk_state == SMC_CLOSED)) | |
a9a08845 | 1551 | mask |= EPOLLHUP; |
8dce2786 UB |
1552 | if (sk->sk_state == SMC_LISTEN) { |
1553 | /* woken up by sk_data_ready in smc_listen_work() */ | |
1554 | mask = smc_accept_poll(sk); | |
1555 | } else { | |
1556 | if (atomic_read(&smc->conn.sndbuf_space) || | |
1557 | sk->sk_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 1558 | mask |= EPOLLOUT | EPOLLWRNORM; |
8dce2786 UB |
1559 | } else { |
1560 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1561 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1562 | } | |
1563 | if (atomic_read(&smc->conn.bytes_to_rcv)) | |
a9a08845 | 1564 | mask |= EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1565 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 1566 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
8dce2786 | 1567 | if (sk->sk_state == SMC_APPCLOSEWAIT1) |
a9a08845 | 1568 | mask |= EPOLLIN; |
71d117f5 KG |
1569 | if (smc->conn.urg_state == SMC_URG_VALID) |
1570 | mask |= EPOLLPRI; | |
8dce2786 | 1571 | } |
ac713874 UB |
1572 | } |
1573 | ||
1574 | return mask; | |
1575 | } | |
1576 | ||
1577 | static int smc_shutdown(struct socket *sock, int how) | |
1578 | { | |
1579 | struct sock *sk = sock->sk; | |
1580 | struct smc_sock *smc; | |
1581 | int rc = -EINVAL; | |
b38d7324 | 1582 | int rc1 = 0; |
ac713874 UB |
1583 | |
1584 | smc = smc_sk(sk); | |
1585 | ||
1586 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
b38d7324 | 1587 | return rc; |
ac713874 UB |
1588 | |
1589 | lock_sock(sk); | |
1590 | ||
1591 | rc = -ENOTCONN; | |
caa21e19 | 1592 | if ((sk->sk_state != SMC_ACTIVE) && |
b38d7324 UB |
1593 | (sk->sk_state != SMC_PEERCLOSEWAIT1) && |
1594 | (sk->sk_state != SMC_PEERCLOSEWAIT2) && | |
1595 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1596 | (sk->sk_state != SMC_APPCLOSEWAIT2) && | |
1597 | (sk->sk_state != SMC_APPFINCLOSEWAIT)) | |
ac713874 UB |
1598 | goto out; |
1599 | if (smc->use_fallback) { | |
1600 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
1601 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
1602 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1603 | sk->sk_state = SMC_CLOSED; | |
b38d7324 | 1604 | goto out; |
ac713874 | 1605 | } |
b38d7324 UB |
1606 | switch (how) { |
1607 | case SHUT_RDWR: /* shutdown in both directions */ | |
1608 | rc = smc_close_active(smc); | |
1609 | break; | |
1610 | case SHUT_WR: | |
1611 | rc = smc_close_shutdown_write(smc); | |
1612 | break; | |
1613 | case SHUT_RD: | |
1255fcb2 UB |
1614 | rc = 0; |
1615 | /* nothing more to do because peer is not involved */ | |
b38d7324 UB |
1616 | break; |
1617 | } | |
1255fcb2 UB |
1618 | if (smc->clcsock) |
1619 | rc1 = kernel_sock_shutdown(smc->clcsock, how); | |
b38d7324 UB |
1620 | /* map sock_shutdown_cmd constants to sk_shutdown value range */ |
1621 | sk->sk_shutdown |= how + 1; | |
ac713874 UB |
1622 | |
1623 | out: | |
1624 | release_sock(sk); | |
b38d7324 | 1625 | return rc ? rc : rc1; |
ac713874 UB |
1626 | } |
1627 | ||
1628 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
1629 | char __user *optval, unsigned int optlen) | |
1630 | { | |
1631 | struct sock *sk = sock->sk; | |
1632 | struct smc_sock *smc; | |
01d2f7e2 | 1633 | int val, rc; |
ac713874 UB |
1634 | |
1635 | smc = smc_sk(sk); | |
1636 | ||
1637 | /* generic setsockopts reaching us here always apply to the | |
1638 | * CLC socket | |
1639 | */ | |
ee9dfbef UB |
1640 | rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, |
1641 | optval, optlen); | |
1642 | if (smc->clcsock->sk->sk_err) { | |
1643 | sk->sk_err = smc->clcsock->sk->sk_err; | |
1644 | sk->sk_error_report(sk); | |
1645 | } | |
1646 | if (rc) | |
1647 | return rc; | |
1648 | ||
01d2f7e2 | 1649 | if (optlen < sizeof(int)) |
3dc9f558 | 1650 | return -EINVAL; |
ac0107ed UB |
1651 | if (get_user(val, (int __user *)optval)) |
1652 | return -EFAULT; | |
01d2f7e2 | 1653 | |
ee9dfbef UB |
1654 | lock_sock(sk); |
1655 | switch (optname) { | |
1656 | case TCP_ULP: | |
1657 | case TCP_FASTOPEN: | |
1658 | case TCP_FASTOPEN_CONNECT: | |
1659 | case TCP_FASTOPEN_KEY: | |
1660 | case TCP_FASTOPEN_NO_COOKIE: | |
1661 | /* option not supported by SMC */ | |
1662 | if (sk->sk_state == SMC_INIT) { | |
1663 | smc->use_fallback = true; | |
603cc149 | 1664 | smc->fallback_rsn = SMC_CLC_DECL_OPTUNSUPP; |
ee9dfbef UB |
1665 | } else { |
1666 | if (!smc->use_fallback) | |
1667 | rc = -EINVAL; | |
1668 | } | |
1669 | break; | |
01d2f7e2 UB |
1670 | case TCP_NODELAY: |
1671 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1672 | if (val && !smc->use_fallback) |
01d2f7e2 UB |
1673 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1674 | 0); | |
1675 | } | |
1676 | break; | |
1677 | case TCP_CORK: | |
1678 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1679 | if (!val && !smc->use_fallback) |
01d2f7e2 UB |
1680 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1681 | 0); | |
1682 | } | |
1683 | break; | |
abb190f1 UB |
1684 | case TCP_DEFER_ACCEPT: |
1685 | smc->sockopt_defer_accept = val; | |
1686 | break; | |
ee9dfbef UB |
1687 | default: |
1688 | break; | |
1689 | } | |
1690 | release_sock(sk); | |
1691 | ||
1692 | return rc; | |
ac713874 UB |
1693 | } |
1694 | ||
1695 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
1696 | char __user *optval, int __user *optlen) | |
1697 | { | |
1698 | struct smc_sock *smc; | |
1699 | ||
1700 | smc = smc_sk(sock->sk); | |
1701 | /* socket options apply to the CLC socket */ | |
1702 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
1703 | optval, optlen); | |
1704 | } | |
1705 | ||
1706 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
1707 | unsigned long arg) | |
1708 | { | |
de8474eb SR |
1709 | union smc_host_cursor cons, urg; |
1710 | struct smc_connection *conn; | |
ac713874 | 1711 | struct smc_sock *smc; |
9b67e26f | 1712 | int answ; |
ac713874 UB |
1713 | |
1714 | smc = smc_sk(sock->sk); | |
de8474eb | 1715 | conn = &smc->conn; |
7311d665 | 1716 | lock_sock(&smc->sk); |
9b67e26f | 1717 | if (smc->use_fallback) { |
7311d665 UB |
1718 | if (!smc->clcsock) { |
1719 | release_sock(&smc->sk); | |
9b67e26f | 1720 | return -EBADF; |
7311d665 UB |
1721 | } |
1722 | answ = smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); | |
1723 | release_sock(&smc->sk); | |
1724 | return answ; | |
9b67e26f UB |
1725 | } |
1726 | switch (cmd) { | |
1727 | case SIOCINQ: /* same as FIONREAD */ | |
1992d998 UB |
1728 | if (smc->sk.sk_state == SMC_LISTEN) { |
1729 | release_sock(&smc->sk); | |
9b67e26f | 1730 | return -EINVAL; |
1992d998 | 1731 | } |
2351abe6 UB |
1732 | if (smc->sk.sk_state == SMC_INIT || |
1733 | smc->sk.sk_state == SMC_CLOSED) | |
1734 | answ = 0; | |
1735 | else | |
1736 | answ = atomic_read(&smc->conn.bytes_to_rcv); | |
9b67e26f UB |
1737 | break; |
1738 | case SIOCOUTQ: | |
1739 | /* output queue size (not send + not acked) */ | |
1992d998 UB |
1740 | if (smc->sk.sk_state == SMC_LISTEN) { |
1741 | release_sock(&smc->sk); | |
9b67e26f | 1742 | return -EINVAL; |
1992d998 | 1743 | } |
2351abe6 UB |
1744 | if (smc->sk.sk_state == SMC_INIT || |
1745 | smc->sk.sk_state == SMC_CLOSED) | |
1746 | answ = 0; | |
1747 | else | |
1748 | answ = smc->conn.sndbuf_desc->len - | |
9b67e26f UB |
1749 | atomic_read(&smc->conn.sndbuf_space); |
1750 | break; | |
1751 | case SIOCOUTQNSD: | |
1752 | /* output queue size (not send only) */ | |
1992d998 UB |
1753 | if (smc->sk.sk_state == SMC_LISTEN) { |
1754 | release_sock(&smc->sk); | |
9b67e26f | 1755 | return -EINVAL; |
1992d998 | 1756 | } |
2351abe6 UB |
1757 | if (smc->sk.sk_state == SMC_INIT || |
1758 | smc->sk.sk_state == SMC_CLOSED) | |
1759 | answ = 0; | |
1760 | else | |
1761 | answ = smc_tx_prepared_sends(&smc->conn); | |
9b67e26f | 1762 | break; |
de8474eb | 1763 | case SIOCATMARK: |
1992d998 UB |
1764 | if (smc->sk.sk_state == SMC_LISTEN) { |
1765 | release_sock(&smc->sk); | |
de8474eb | 1766 | return -EINVAL; |
1992d998 | 1767 | } |
de8474eb SR |
1768 | if (smc->sk.sk_state == SMC_INIT || |
1769 | smc->sk.sk_state == SMC_CLOSED) { | |
1770 | answ = 0; | |
1771 | } else { | |
bac6de7b SR |
1772 | smc_curs_copy(&cons, &conn->local_tx_ctrl.cons, conn); |
1773 | smc_curs_copy(&urg, &conn->urg_curs, conn); | |
de8474eb SR |
1774 | answ = smc_curs_diff(conn->rmb_desc->len, |
1775 | &cons, &urg) == 1; | |
1776 | } | |
1777 | break; | |
9b67e26f | 1778 | default: |
1992d998 | 1779 | release_sock(&smc->sk); |
9b67e26f UB |
1780 | return -ENOIOCTLCMD; |
1781 | } | |
1992d998 | 1782 | release_sock(&smc->sk); |
9b67e26f UB |
1783 | |
1784 | return put_user(answ, (int __user *)arg); | |
ac713874 UB |
1785 | } |
1786 | ||
1787 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
1788 | int offset, size_t size, int flags) | |
1789 | { | |
1790 | struct sock *sk = sock->sk; | |
1791 | struct smc_sock *smc; | |
1792 | int rc = -EPIPE; | |
1793 | ||
1794 | smc = smc_sk(sk); | |
1795 | lock_sock(sk); | |
bda27ff5 SR |
1796 | if (sk->sk_state != SMC_ACTIVE) { |
1797 | release_sock(sk); | |
ac713874 | 1798 | goto out; |
bda27ff5 SR |
1799 | } |
1800 | release_sock(sk); | |
ac713874 UB |
1801 | if (smc->use_fallback) |
1802 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
1803 | size, flags); | |
1804 | else | |
1805 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
1806 | ||
1807 | out: | |
ac713874 UB |
1808 | return rc; |
1809 | } | |
1810 | ||
9014db20 SR |
1811 | /* Map the affected portions of the rmbe into an spd, note the number of bytes |
1812 | * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor | |
1813 | * updates till whenever a respective page has been fully processed. | |
1814 | * Note that subsequent recv() calls have to wait till all splice() processing | |
1815 | * completed. | |
1816 | */ | |
ac713874 UB |
1817 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, |
1818 | struct pipe_inode_info *pipe, size_t len, | |
9014db20 | 1819 | unsigned int flags) |
ac713874 UB |
1820 | { |
1821 | struct sock *sk = sock->sk; | |
1822 | struct smc_sock *smc; | |
1823 | int rc = -ENOTCONN; | |
1824 | ||
1825 | smc = smc_sk(sk); | |
1826 | lock_sock(sk); | |
9014db20 SR |
1827 | |
1828 | if (sk->sk_state == SMC_INIT || | |
1829 | sk->sk_state == SMC_LISTEN || | |
1830 | sk->sk_state == SMC_CLOSED) | |
1831 | goto out; | |
1832 | ||
1833 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { | |
1834 | rc = 0; | |
ac713874 | 1835 | goto out; |
9014db20 SR |
1836 | } |
1837 | ||
ac713874 UB |
1838 | if (smc->use_fallback) { |
1839 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
1840 | pipe, len, flags); | |
1841 | } else { | |
9014db20 SR |
1842 | if (*ppos) { |
1843 | rc = -ESPIPE; | |
1844 | goto out; | |
1845 | } | |
1846 | if (flags & SPLICE_F_NONBLOCK) | |
1847 | flags = MSG_DONTWAIT; | |
1848 | else | |
1849 | flags = 0; | |
1850 | rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); | |
ac713874 UB |
1851 | } |
1852 | out: | |
1853 | release_sock(sk); | |
9014db20 | 1854 | |
ac713874 UB |
1855 | return rc; |
1856 | } | |
1857 | ||
1858 | /* must look like tcp */ | |
1859 | static const struct proto_ops smc_sock_ops = { | |
1860 | .family = PF_SMC, | |
1861 | .owner = THIS_MODULE, | |
1862 | .release = smc_release, | |
1863 | .bind = smc_bind, | |
1864 | .connect = smc_connect, | |
1865 | .socketpair = sock_no_socketpair, | |
1866 | .accept = smc_accept, | |
1867 | .getname = smc_getname, | |
a11e1d43 | 1868 | .poll = smc_poll, |
ac713874 UB |
1869 | .ioctl = smc_ioctl, |
1870 | .listen = smc_listen, | |
1871 | .shutdown = smc_shutdown, | |
1872 | .setsockopt = smc_setsockopt, | |
1873 | .getsockopt = smc_getsockopt, | |
1874 | .sendmsg = smc_sendmsg, | |
1875 | .recvmsg = smc_recvmsg, | |
1876 | .mmap = sock_no_mmap, | |
1877 | .sendpage = smc_sendpage, | |
1878 | .splice_read = smc_splice_read, | |
1879 | }; | |
1880 | ||
1881 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1882 | int kern) | |
1883 | { | |
aaa4d33f | 1884 | int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; |
ac713874 UB |
1885 | struct smc_sock *smc; |
1886 | struct sock *sk; | |
1887 | int rc; | |
1888 | ||
1889 | rc = -ESOCKTNOSUPPORT; | |
1890 | if (sock->type != SOCK_STREAM) | |
1891 | goto out; | |
1892 | ||
1893 | rc = -EPROTONOSUPPORT; | |
aaa4d33f | 1894 | if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) |
ac713874 UB |
1895 | goto out; |
1896 | ||
1897 | rc = -ENOBUFS; | |
1898 | sock->ops = &smc_sock_ops; | |
aaa4d33f | 1899 | sk = smc_sock_alloc(net, sock, protocol); |
ac713874 UB |
1900 | if (!sk) |
1901 | goto out; | |
1902 | ||
1903 | /* create internal TCP socket for CLC handshake and fallback */ | |
1904 | smc = smc_sk(sk); | |
a046d57d | 1905 | smc->use_fallback = false; /* assume rdma capability first */ |
603cc149 | 1906 | smc->fallback_rsn = 0; |
aaa4d33f KG |
1907 | rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, |
1908 | &smc->clcsock); | |
a5dcb73b | 1909 | if (rc) { |
ac713874 | 1910 | sk_common_release(sk); |
a5dcb73b DC |
1911 | goto out; |
1912 | } | |
cd6851f3 UB |
1913 | smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
1914 | smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); | |
ac713874 UB |
1915 | |
1916 | out: | |
1917 | return rc; | |
1918 | } | |
1919 | ||
1920 | static const struct net_proto_family smc_sock_family_ops = { | |
1921 | .family = PF_SMC, | |
1922 | .owner = THIS_MODULE, | |
1923 | .create = smc_create, | |
1924 | }; | |
1925 | ||
1926 | static int __init smc_init(void) | |
1927 | { | |
1928 | int rc; | |
1929 | ||
6812baab TR |
1930 | rc = smc_pnet_init(); |
1931 | if (rc) | |
1932 | return rc; | |
1933 | ||
9bf9abea UB |
1934 | rc = smc_llc_init(); |
1935 | if (rc) { | |
1936 | pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); | |
1937 | goto out_pnet; | |
1938 | } | |
1939 | ||
5f08318f UB |
1940 | rc = smc_cdc_init(); |
1941 | if (rc) { | |
1942 | pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); | |
1943 | goto out_pnet; | |
1944 | } | |
1945 | ||
ac713874 UB |
1946 | rc = proto_register(&smc_proto, 1); |
1947 | if (rc) { | |
aaa4d33f | 1948 | pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); |
6812baab | 1949 | goto out_pnet; |
ac713874 UB |
1950 | } |
1951 | ||
aaa4d33f KG |
1952 | rc = proto_register(&smc_proto6, 1); |
1953 | if (rc) { | |
1954 | pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); | |
1955 | goto out_proto; | |
1956 | } | |
1957 | ||
ac713874 UB |
1958 | rc = sock_register(&smc_sock_family_ops); |
1959 | if (rc) { | |
1960 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
aaa4d33f | 1961 | goto out_proto6; |
ac713874 | 1962 | } |
f16a7dd5 | 1963 | INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); |
aaa4d33f | 1964 | INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); |
ac713874 | 1965 | |
a4cf0443 UB |
1966 | rc = smc_ib_register_client(); |
1967 | if (rc) { | |
1968 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
1969 | goto out_sock; | |
1970 | } | |
1971 | ||
c5c1cc9c | 1972 | static_branch_enable(&tcp_have_smc); |
ac713874 UB |
1973 | return 0; |
1974 | ||
a4cf0443 UB |
1975 | out_sock: |
1976 | sock_unregister(PF_SMC); | |
aaa4d33f KG |
1977 | out_proto6: |
1978 | proto_unregister(&smc_proto6); | |
ac713874 UB |
1979 | out_proto: |
1980 | proto_unregister(&smc_proto); | |
6812baab TR |
1981 | out_pnet: |
1982 | smc_pnet_exit(); | |
ac713874 UB |
1983 | return rc; |
1984 | } | |
1985 | ||
1986 | static void __exit smc_exit(void) | |
1987 | { | |
9fda3510 | 1988 | smc_core_exit(); |
c5c1cc9c | 1989 | static_branch_disable(&tcp_have_smc); |
a4cf0443 | 1990 | smc_ib_unregister_client(); |
ac713874 | 1991 | sock_unregister(PF_SMC); |
aaa4d33f | 1992 | proto_unregister(&smc_proto6); |
ac713874 | 1993 | proto_unregister(&smc_proto); |
6812baab | 1994 | smc_pnet_exit(); |
ac713874 UB |
1995 | } |
1996 | ||
1997 | module_init(smc_init); | |
1998 | module_exit(smc_exit); | |
1999 | ||
2000 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
2001 | MODULE_DESCRIPTION("smc socket address family"); | |
2002 | MODULE_LICENSE("GPL"); | |
2003 | MODULE_ALIAS_NETPROTO(PF_SMC); |