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 UB |
9 | * Initial restrictions: |
10 | * - non-blocking connect postponed | |
11 | * - IPv6 support postponed | |
12 | * - support for alternate links postponed | |
13 | * - partial support for non-blocking sockets only | |
14 | * - support for urgent data postponed | |
15 | * | |
ac713874 UB |
16 | * Copyright IBM Corp. 2016 |
17 | * | |
18 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
19 | * based on prototype from Frank Blaschka | |
20 | */ | |
21 | ||
22 | #define KMSG_COMPONENT "smc" | |
23 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/socket.h> | |
a046d57d UB |
27 | #include <linux/inetdevice.h> |
28 | #include <linux/workqueue.h> | |
5f08318f | 29 | #include <linux/in.h> |
c3edc401 IM |
30 | #include <linux/sched/signal.h> |
31 | ||
ac713874 | 32 | #include <net/sock.h> |
a046d57d | 33 | #include <net/tcp.h> |
f16a7dd5 | 34 | #include <net/smc.h> |
ac713874 UB |
35 | |
36 | #include "smc.h" | |
a046d57d | 37 | #include "smc_clc.h" |
9bf9abea | 38 | #include "smc_llc.h" |
5f08318f | 39 | #include "smc_cdc.h" |
0cfdd8f9 | 40 | #include "smc_core.h" |
a4cf0443 | 41 | #include "smc_ib.h" |
6812baab | 42 | #include "smc_pnet.h" |
e6727f39 | 43 | #include "smc_tx.h" |
952310cc | 44 | #include "smc_rx.h" |
b38d7324 | 45 | #include "smc_close.h" |
ac713874 | 46 | |
0cfdd8f9 UB |
47 | static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group |
48 | * creation | |
49 | */ | |
50 | ||
51 | struct smc_lgr_list smc_lgr_list = { /* established link groups */ | |
52 | .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), | |
53 | .list = LIST_HEAD_INIT(smc_lgr_list.list), | |
54 | }; | |
55 | ||
a046d57d UB |
56 | static void smc_tcp_listen_work(struct work_struct *); |
57 | ||
ac713874 UB |
58 | static void smc_set_keepalive(struct sock *sk, int val) |
59 | { | |
60 | struct smc_sock *smc = smc_sk(sk); | |
61 | ||
62 | smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); | |
63 | } | |
64 | ||
f16a7dd5 UB |
65 | static struct smc_hashinfo smc_v4_hashinfo = { |
66 | .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), | |
67 | }; | |
68 | ||
69 | int smc_hash_sk(struct sock *sk) | |
70 | { | |
71 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
72 | struct hlist_head *head; | |
73 | ||
74 | head = &h->ht; | |
75 | ||
76 | write_lock_bh(&h->lock); | |
77 | sk_add_node(sk, head); | |
78 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
79 | write_unlock_bh(&h->lock); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(smc_hash_sk); | |
84 | ||
85 | void smc_unhash_sk(struct sock *sk) | |
86 | { | |
87 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
88 | ||
89 | write_lock_bh(&h->lock); | |
90 | if (sk_del_node_init(sk)) | |
91 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
92 | write_unlock_bh(&h->lock); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(smc_unhash_sk); | |
95 | ||
96 | struct proto smc_proto = { | |
ac713874 UB |
97 | .name = "SMC", |
98 | .owner = THIS_MODULE, | |
99 | .keepalive = smc_set_keepalive, | |
f16a7dd5 UB |
100 | .hash = smc_hash_sk, |
101 | .unhash = smc_unhash_sk, | |
ac713874 | 102 | .obj_size = sizeof(struct smc_sock), |
f16a7dd5 | 103 | .h.smc_hash = &smc_v4_hashinfo, |
5f0d5a3a | 104 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
ac713874 | 105 | }; |
f16a7dd5 | 106 | EXPORT_SYMBOL_GPL(smc_proto); |
ac713874 UB |
107 | |
108 | static int smc_release(struct socket *sock) | |
109 | { | |
110 | struct sock *sk = sock->sk; | |
111 | struct smc_sock *smc; | |
b38d7324 | 112 | int rc = 0; |
ac713874 UB |
113 | |
114 | if (!sk) | |
115 | goto out; | |
116 | ||
117 | smc = smc_sk(sk); | |
b38d7324 UB |
118 | if (sk->sk_state == SMC_LISTEN) |
119 | /* smc_close_non_accepted() is called and acquires | |
120 | * sock lock for child sockets again | |
121 | */ | |
122 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
123 | else | |
124 | lock_sock(sk); | |
ac713874 | 125 | |
51f1de79 | 126 | if (!smc->use_fallback) { |
b38d7324 UB |
127 | rc = smc_close_active(smc); |
128 | sock_set_flag(sk, SOCK_DEAD); | |
129 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
130 | } | |
ac713874 UB |
131 | if (smc->clcsock) { |
132 | sock_release(smc->clcsock); | |
133 | smc->clcsock = NULL; | |
134 | } | |
51f1de79 UB |
135 | if (smc->use_fallback) { |
136 | sock_put(sk); /* passive closing */ | |
137 | sk->sk_state = SMC_CLOSED; | |
138 | sk->sk_state_change(sk); | |
139 | } | |
ac713874 UB |
140 | |
141 | /* detach socket */ | |
142 | sock_orphan(sk); | |
143 | sock->sk = NULL; | |
51f1de79 | 144 | if (!smc->use_fallback && sk->sk_state == SMC_CLOSED) |
b38d7324 | 145 | smc_conn_free(&smc->conn); |
ac713874 UB |
146 | release_sock(sk); |
147 | ||
51f1de79 UB |
148 | sk->sk_prot->unhash(sk); |
149 | sock_put(sk); /* final sock_put */ | |
ac713874 | 150 | out: |
b38d7324 | 151 | return rc; |
ac713874 UB |
152 | } |
153 | ||
154 | static void smc_destruct(struct sock *sk) | |
155 | { | |
156 | if (sk->sk_state != SMC_CLOSED) | |
157 | return; | |
158 | if (!sock_flag(sk, SOCK_DEAD)) | |
159 | return; | |
160 | ||
161 | sk_refcnt_debug_dec(sk); | |
162 | } | |
163 | ||
164 | static struct sock *smc_sock_alloc(struct net *net, struct socket *sock) | |
165 | { | |
166 | struct smc_sock *smc; | |
167 | struct sock *sk; | |
168 | ||
169 | sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0); | |
170 | if (!sk) | |
171 | return NULL; | |
172 | ||
173 | sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ | |
174 | sk->sk_state = SMC_INIT; | |
175 | sk->sk_destruct = smc_destruct; | |
176 | sk->sk_protocol = SMCPROTO_SMC; | |
ac713874 | 177 | smc = smc_sk(sk); |
a046d57d UB |
178 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
179 | INIT_LIST_HEAD(&smc->accept_q); | |
180 | spin_lock_init(&smc->accept_q_lock); | |
f16a7dd5 | 181 | sk->sk_prot->hash(sk); |
a046d57d | 182 | sk_refcnt_debug_inc(sk); |
ac713874 UB |
183 | |
184 | return sk; | |
185 | } | |
186 | ||
187 | static int smc_bind(struct socket *sock, struct sockaddr *uaddr, | |
188 | int addr_len) | |
189 | { | |
190 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
191 | struct sock *sk = sock->sk; | |
192 | struct smc_sock *smc; | |
193 | int rc; | |
194 | ||
195 | smc = smc_sk(sk); | |
196 | ||
197 | /* replicate tests from inet_bind(), to be safe wrt. future changes */ | |
198 | rc = -EINVAL; | |
199 | if (addr_len < sizeof(struct sockaddr_in)) | |
200 | goto out; | |
201 | ||
202 | rc = -EAFNOSUPPORT; | |
203 | /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ | |
204 | if ((addr->sin_family != AF_INET) && | |
205 | ((addr->sin_family != AF_UNSPEC) || | |
206 | (addr->sin_addr.s_addr != htonl(INADDR_ANY)))) | |
207 | goto out; | |
208 | ||
209 | lock_sock(sk); | |
210 | ||
211 | /* Check if socket is already active */ | |
212 | rc = -EINVAL; | |
213 | if (sk->sk_state != SMC_INIT) | |
214 | goto out_rel; | |
215 | ||
216 | smc->clcsock->sk->sk_reuse = sk->sk_reuse; | |
217 | rc = kernel_bind(smc->clcsock, uaddr, addr_len); | |
218 | ||
219 | out_rel: | |
220 | release_sock(sk); | |
221 | out: | |
222 | return rc; | |
223 | } | |
224 | ||
225 | static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, | |
226 | unsigned long mask) | |
227 | { | |
228 | /* options we don't get control via setsockopt for */ | |
229 | nsk->sk_type = osk->sk_type; | |
230 | nsk->sk_sndbuf = osk->sk_sndbuf; | |
231 | nsk->sk_rcvbuf = osk->sk_rcvbuf; | |
232 | nsk->sk_sndtimeo = osk->sk_sndtimeo; | |
233 | nsk->sk_rcvtimeo = osk->sk_rcvtimeo; | |
234 | nsk->sk_mark = osk->sk_mark; | |
235 | nsk->sk_priority = osk->sk_priority; | |
236 | nsk->sk_rcvlowat = osk->sk_rcvlowat; | |
237 | nsk->sk_bound_dev_if = osk->sk_bound_dev_if; | |
238 | nsk->sk_err = osk->sk_err; | |
239 | ||
240 | nsk->sk_flags &= ~mask; | |
241 | nsk->sk_flags |= osk->sk_flags & mask; | |
242 | } | |
243 | ||
244 | #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ | |
245 | (1UL << SOCK_KEEPOPEN) | \ | |
246 | (1UL << SOCK_LINGER) | \ | |
247 | (1UL << SOCK_BROADCAST) | \ | |
248 | (1UL << SOCK_TIMESTAMP) | \ | |
249 | (1UL << SOCK_DBG) | \ | |
250 | (1UL << SOCK_RCVTSTAMP) | \ | |
251 | (1UL << SOCK_RCVTSTAMPNS) | \ | |
252 | (1UL << SOCK_LOCALROUTE) | \ | |
253 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
254 | (1UL << SOCK_RXQ_OVFL) | \ | |
255 | (1UL << SOCK_WIFI_STATUS) | \ | |
256 | (1UL << SOCK_NOFCS) | \ | |
257 | (1UL << SOCK_FILTER_LOCKED)) | |
258 | /* copy only relevant settings and flags of SOL_SOCKET level from smc to | |
259 | * clc socket (since smc is not called for these options from net/core) | |
260 | */ | |
261 | static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) | |
262 | { | |
263 | smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); | |
264 | } | |
265 | ||
266 | #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ | |
267 | (1UL << SOCK_KEEPOPEN) | \ | |
268 | (1UL << SOCK_LINGER) | \ | |
269 | (1UL << SOCK_DBG)) | |
270 | /* copy only settings and flags relevant for smc from clc to smc socket */ | |
271 | static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) | |
272 | { | |
273 | smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); | |
274 | } | |
275 | ||
a046d57d UB |
276 | /* determine subnet and mask of internal TCP socket */ |
277 | int smc_netinfo_by_tcpsk(struct socket *clcsock, | |
278 | __be32 *subnet, u8 *prefix_len) | |
279 | { | |
280 | struct dst_entry *dst = sk_dst_get(clcsock->sk); | |
731b0085 | 281 | struct in_device *in_dev; |
a046d57d UB |
282 | struct sockaddr_in addr; |
283 | int rc = -ENOENT; | |
284 | int len; | |
285 | ||
286 | if (!dst) { | |
287 | rc = -ENOTCONN; | |
288 | goto out; | |
289 | } | |
290 | if (!dst->dev) { | |
291 | rc = -ENODEV; | |
292 | goto out_rel; | |
293 | } | |
294 | ||
295 | /* get address to which the internal TCP socket is bound */ | |
296 | kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len); | |
297 | /* analyze IPv4 specific data of net_device belonging to TCP socket */ | |
731b0085 UB |
298 | rcu_read_lock(); |
299 | in_dev = __in_dev_get_rcu(dst->dev); | |
300 | for_ifa(in_dev) { | |
301 | if (!inet_ifa_match(addr.sin_addr.s_addr, ifa)) | |
a046d57d UB |
302 | continue; |
303 | *prefix_len = inet_mask_len(ifa->ifa_mask); | |
304 | *subnet = ifa->ifa_address & ifa->ifa_mask; | |
305 | rc = 0; | |
306 | break; | |
731b0085 UB |
307 | } endfor_ifa(in_dev); |
308 | rcu_read_unlock(); | |
a046d57d UB |
309 | |
310 | out_rel: | |
311 | dst_release(dst); | |
312 | out: | |
313 | return rc; | |
314 | } | |
315 | ||
9bf9abea UB |
316 | static int smc_clnt_conf_first_link(struct smc_sock *smc, union ib_gid *gid) |
317 | { | |
318 | struct smc_link_group *lgr = smc->conn.lgr; | |
319 | struct smc_link *link; | |
320 | int rest; | |
321 | int rc; | |
322 | ||
323 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
324 | /* receive CONFIRM LINK request from server over RoCE fabric */ | |
325 | rest = wait_for_completion_interruptible_timeout( | |
326 | &link->llc_confirm, | |
327 | SMC_LLC_WAIT_FIRST_TIME); | |
328 | if (rest <= 0) { | |
329 | struct smc_clc_msg_decline dclc; | |
330 | ||
331 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
332 | SMC_CLC_DECLINE); | |
333 | return rc; | |
334 | } | |
335 | ||
336 | rc = smc_ib_modify_qp_rts(link); | |
337 | if (rc) | |
338 | return SMC_CLC_DECL_INTERR; | |
339 | ||
340 | smc_wr_remember_qp_attr(link); | |
652a1e41 UB |
341 | |
342 | rc = smc_wr_reg_send(link, | |
343 | smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]); | |
344 | if (rc) | |
345 | return SMC_CLC_DECL_INTERR; | |
346 | ||
9bf9abea UB |
347 | /* send CONFIRM LINK response over RoCE fabric */ |
348 | rc = smc_llc_send_confirm_link(link, | |
349 | link->smcibdev->mac[link->ibport - 1], | |
350 | gid, SMC_LLC_RESP); | |
351 | if (rc < 0) | |
352 | return SMC_CLC_DECL_TCL; | |
353 | ||
354 | return rc; | |
355 | } | |
356 | ||
0cfdd8f9 UB |
357 | static void smc_conn_save_peer_info(struct smc_sock *smc, |
358 | struct smc_clc_msg_accept_confirm *clc) | |
359 | { | |
360 | smc->conn.peer_conn_idx = clc->conn_idx; | |
5f08318f | 361 | smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); |
cd6851f3 UB |
362 | smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size); |
363 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); | |
0cfdd8f9 UB |
364 | } |
365 | ||
366 | static void smc_link_save_peer_info(struct smc_link *link, | |
367 | struct smc_clc_msg_accept_confirm *clc) | |
368 | { | |
369 | link->peer_qpn = ntoh24(clc->qpn); | |
370 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
371 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
372 | link->peer_psn = ntoh24(clc->psn); | |
373 | link->peer_mtu = clc->qp_mtu; | |
374 | } | |
375 | ||
610db66f UB |
376 | static void smc_lgr_forget(struct smc_link_group *lgr) |
377 | { | |
378 | spin_lock_bh(&smc_lgr_list.lock); | |
379 | /* do not use this link group for new connections */ | |
380 | if (!list_empty(&lgr->list)) | |
381 | list_del_init(&lgr->list); | |
382 | spin_unlock_bh(&smc_lgr_list.lock); | |
383 | } | |
384 | ||
a046d57d UB |
385 | /* setup for RDMA connection of client */ |
386 | static int smc_connect_rdma(struct smc_sock *smc) | |
387 | { | |
0cfdd8f9 | 388 | struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr; |
a046d57d | 389 | struct smc_clc_msg_accept_confirm aclc; |
0cfdd8f9 | 390 | int local_contact = SMC_FIRST_CONTACT; |
a046d57d | 391 | struct smc_ib_device *smcibdev; |
0cfdd8f9 UB |
392 | struct smc_link *link; |
393 | u8 srv_first_contact; | |
a046d57d UB |
394 | int reason_code = 0; |
395 | int rc = 0; | |
396 | u8 ibport; | |
397 | ||
51f1de79 UB |
398 | sock_hold(&smc->sk); /* sock put in passive closing */ |
399 | ||
c5c1cc9c UB |
400 | if (!tcp_sk(smc->clcsock->sk)->syn_smc) { |
401 | /* peer has not signalled SMC-capability */ | |
402 | smc->use_fallback = true; | |
403 | goto out_connected; | |
404 | } | |
405 | ||
a046d57d UB |
406 | /* IPSec connections opt out of SMC-R optimizations */ |
407 | if (using_ipsec(smc)) { | |
408 | reason_code = SMC_CLC_DECL_IPSEC; | |
409 | goto decline_rdma; | |
410 | } | |
411 | ||
412 | /* PNET table look up: search active ib_device and port | |
413 | * within same PNETID that also contains the ethernet device | |
414 | * used for the internal TCP socket | |
415 | */ | |
416 | smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport); | |
417 | if (!smcibdev) { | |
418 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
419 | goto decline_rdma; | |
420 | } | |
421 | ||
422 | /* do inband token exchange */ | |
423 | reason_code = smc_clc_send_proposal(smc, smcibdev, ibport); | |
424 | if (reason_code < 0) { | |
425 | rc = reason_code; | |
426 | goto out_err; | |
427 | } | |
428 | if (reason_code > 0) /* configuration error */ | |
429 | goto decline_rdma; | |
430 | /* receive SMC Accept CLC message */ | |
431 | reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc), | |
432 | SMC_CLC_ACCEPT); | |
433 | if (reason_code < 0) { | |
434 | rc = reason_code; | |
435 | goto out_err; | |
436 | } | |
437 | if (reason_code > 0) | |
438 | goto decline_rdma; | |
439 | ||
0cfdd8f9 UB |
440 | srv_first_contact = aclc.hdr.flag; |
441 | mutex_lock(&smc_create_lgr_pending); | |
442 | local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev, | |
443 | ibport, &aclc.lcl, srv_first_contact); | |
444 | if (local_contact < 0) { | |
445 | rc = local_contact; | |
446 | if (rc == -ENOMEM) | |
447 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
448 | else if (rc == -ENOLINK) | |
449 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
450 | goto decline_rdma_unlock; | |
451 | } | |
452 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 453 | |
0cfdd8f9 | 454 | smc_conn_save_peer_info(smc, &aclc); |
cd6851f3 | 455 | |
3e034725 UB |
456 | /* create send buffer and rmb */ |
457 | rc = smc_buf_create(smc); | |
cd6851f3 UB |
458 | if (rc) { |
459 | reason_code = SMC_CLC_DECL_MEM; | |
460 | goto decline_rdma_unlock; | |
461 | } | |
462 | ||
0cfdd8f9 UB |
463 | if (local_contact == SMC_FIRST_CONTACT) |
464 | smc_link_save_peer_info(link, &aclc); | |
bd4ad577 UB |
465 | |
466 | rc = smc_rmb_rtoken_handling(&smc->conn, &aclc); | |
467 | if (rc) { | |
468 | reason_code = SMC_CLC_DECL_INTERR; | |
469 | goto decline_rdma_unlock; | |
470 | } | |
471 | ||
46c28dbd UB |
472 | smc_close_init(smc); |
473 | smc_rx_init(smc); | |
474 | ||
bd4ad577 UB |
475 | if (local_contact == SMC_FIRST_CONTACT) { |
476 | rc = smc_ib_ready_link(link); | |
477 | if (rc) { | |
478 | reason_code = SMC_CLC_DECL_INTERR; | |
479 | goto decline_rdma_unlock; | |
480 | } | |
652a1e41 UB |
481 | } else { |
482 | struct smc_buf_desc *buf_desc = smc->conn.rmb_desc; | |
483 | ||
484 | if (!buf_desc->reused) { | |
485 | /* register memory region for new rmb */ | |
486 | rc = smc_wr_reg_send(link, | |
487 | buf_desc->mr_rx[SMC_SINGLE_LINK]); | |
488 | if (rc) { | |
489 | reason_code = SMC_CLC_DECL_INTERR; | |
490 | goto decline_rdma_unlock; | |
491 | } | |
492 | } | |
bd4ad577 | 493 | } |
10428dd8 | 494 | smc_rmb_sync_sg_for_device(&smc->conn); |
a046d57d UB |
495 | |
496 | rc = smc_clc_send_confirm(smc); | |
497 | if (rc) | |
0cfdd8f9 | 498 | goto out_err_unlock; |
a046d57d | 499 | |
9bf9abea UB |
500 | if (local_contact == SMC_FIRST_CONTACT) { |
501 | /* QP confirmation over RoCE fabric */ | |
502 | reason_code = smc_clnt_conf_first_link( | |
503 | smc, &smcibdev->gid[ibport - 1]); | |
504 | if (reason_code < 0) { | |
505 | rc = reason_code; | |
506 | goto out_err_unlock; | |
507 | } | |
508 | if (reason_code > 0) | |
509 | goto decline_rdma_unlock; | |
510 | } | |
a046d57d | 511 | |
0cfdd8f9 | 512 | mutex_unlock(&smc_create_lgr_pending); |
e6727f39 UB |
513 | smc_tx_init(smc); |
514 | ||
a046d57d UB |
515 | out_connected: |
516 | smc_copy_sock_settings_to_clc(smc); | |
b38d7324 UB |
517 | if (smc->sk.sk_state == SMC_INIT) |
518 | smc->sk.sk_state = SMC_ACTIVE; | |
a046d57d | 519 | |
0cfdd8f9 | 520 | return rc ? rc : local_contact; |
a046d57d | 521 | |
0cfdd8f9 | 522 | decline_rdma_unlock: |
610db66f UB |
523 | if (local_contact == SMC_FIRST_CONTACT) |
524 | smc_lgr_forget(smc->conn.lgr); | |
0cfdd8f9 UB |
525 | mutex_unlock(&smc_create_lgr_pending); |
526 | smc_conn_free(&smc->conn); | |
a046d57d UB |
527 | decline_rdma: |
528 | /* RDMA setup failed, switch back to TCP */ | |
529 | smc->use_fallback = true; | |
530 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
bfbedfd3 | 531 | rc = smc_clc_send_decline(smc, reason_code); |
0c9f1515 | 532 | if (rc < 0) |
a046d57d UB |
533 | goto out_err; |
534 | } | |
535 | goto out_connected; | |
536 | ||
0cfdd8f9 | 537 | out_err_unlock: |
610db66f UB |
538 | if (local_contact == SMC_FIRST_CONTACT) |
539 | smc_lgr_forget(smc->conn.lgr); | |
0cfdd8f9 UB |
540 | mutex_unlock(&smc_create_lgr_pending); |
541 | smc_conn_free(&smc->conn); | |
a046d57d | 542 | out_err: |
51f1de79 UB |
543 | if (smc->sk.sk_state == SMC_INIT) |
544 | sock_put(&smc->sk); /* passive closing */ | |
a046d57d UB |
545 | return rc; |
546 | } | |
547 | ||
ac713874 UB |
548 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
549 | int alen, int flags) | |
550 | { | |
551 | struct sock *sk = sock->sk; | |
552 | struct smc_sock *smc; | |
553 | int rc = -EINVAL; | |
554 | ||
555 | smc = smc_sk(sk); | |
556 | ||
557 | /* separate smc parameter checking to be safe */ | |
558 | if (alen < sizeof(addr->sa_family)) | |
559 | goto out_err; | |
560 | if (addr->sa_family != AF_INET) | |
561 | goto out_err; | |
a046d57d | 562 | smc->addr = addr; /* needed for nonblocking connect */ |
ac713874 UB |
563 | |
564 | lock_sock(sk); | |
565 | switch (sk->sk_state) { | |
566 | default: | |
567 | goto out; | |
568 | case SMC_ACTIVE: | |
569 | rc = -EISCONN; | |
570 | goto out; | |
571 | case SMC_INIT: | |
572 | rc = 0; | |
573 | break; | |
574 | } | |
575 | ||
576 | smc_copy_sock_settings_to_clc(smc); | |
c5c1cc9c | 577 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; |
ac713874 UB |
578 | rc = kernel_connect(smc->clcsock, addr, alen, flags); |
579 | if (rc) | |
580 | goto out; | |
581 | ||
a046d57d UB |
582 | /* setup RDMA connection */ |
583 | rc = smc_connect_rdma(smc); | |
584 | if (rc < 0) | |
585 | goto out; | |
586 | else | |
587 | rc = 0; /* success cases including fallback */ | |
ac713874 UB |
588 | |
589 | out: | |
590 | release_sock(sk); | |
591 | out_err: | |
592 | return rc; | |
593 | } | |
594 | ||
595 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
596 | { | |
3163c507 UB |
597 | struct socket *new_clcsock = NULL; |
598 | struct sock *lsk = &lsmc->sk; | |
ac713874 UB |
599 | struct sock *new_sk; |
600 | int rc; | |
601 | ||
3163c507 UB |
602 | release_sock(lsk); |
603 | new_sk = smc_sock_alloc(sock_net(lsk), NULL); | |
ac713874 UB |
604 | if (!new_sk) { |
605 | rc = -ENOMEM; | |
3163c507 | 606 | lsk->sk_err = ENOMEM; |
ac713874 | 607 | *new_smc = NULL; |
3163c507 | 608 | lock_sock(lsk); |
ac713874 UB |
609 | goto out; |
610 | } | |
611 | *new_smc = smc_sk(new_sk); | |
612 | ||
613 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
3163c507 | 614 | lock_sock(lsk); |
35a6b178 | 615 | if (rc < 0) |
3163c507 | 616 | lsk->sk_err = -rc; |
35a6b178 | 617 | if (rc < 0 || lsk->sk_state == SMC_CLOSED) { |
a046d57d UB |
618 | if (new_clcsock) |
619 | sock_release(new_clcsock); | |
620 | new_sk->sk_state = SMC_CLOSED; | |
621 | sock_set_flag(new_sk, SOCK_DEAD); | |
3163c507 | 622 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 623 | sock_put(new_sk); /* final */ |
ac713874 UB |
624 | *new_smc = NULL; |
625 | goto out; | |
626 | } | |
627 | ||
628 | (*new_smc)->clcsock = new_clcsock; | |
629 | out: | |
630 | return rc; | |
631 | } | |
632 | ||
a046d57d UB |
633 | /* add a just created sock to the accept queue of the listen sock as |
634 | * candidate for a following socket accept call from user space | |
635 | */ | |
636 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
637 | { | |
638 | struct smc_sock *par = smc_sk(parent); | |
639 | ||
51f1de79 | 640 | sock_hold(sk); /* sock_put in smc_accept_unlink () */ |
a046d57d UB |
641 | spin_lock(&par->accept_q_lock); |
642 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
643 | spin_unlock(&par->accept_q_lock); | |
644 | sk_acceptq_added(parent); | |
645 | } | |
646 | ||
647 | /* remove a socket from the accept queue of its parental listening socket */ | |
648 | static void smc_accept_unlink(struct sock *sk) | |
649 | { | |
650 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
651 | ||
652 | spin_lock(&par->accept_q_lock); | |
653 | list_del_init(&smc_sk(sk)->accept_q); | |
654 | spin_unlock(&par->accept_q_lock); | |
655 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
51f1de79 | 656 | sock_put(sk); /* sock_hold in smc_accept_enqueue */ |
a046d57d UB |
657 | } |
658 | ||
659 | /* remove a sock from the accept queue to bind it to a new socket created | |
660 | * for a socket accept call from user space | |
661 | */ | |
b38d7324 UB |
662 | struct sock *smc_accept_dequeue(struct sock *parent, |
663 | struct socket *new_sock) | |
a046d57d UB |
664 | { |
665 | struct smc_sock *isk, *n; | |
666 | struct sock *new_sk; | |
667 | ||
668 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
669 | new_sk = (struct sock *)isk; | |
670 | ||
671 | smc_accept_unlink(new_sk); | |
672 | if (new_sk->sk_state == SMC_CLOSED) { | |
127f4970 UB |
673 | if (isk->clcsock) { |
674 | sock_release(isk->clcsock); | |
675 | isk->clcsock = NULL; | |
676 | } | |
288c8390 | 677 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 678 | sock_put(new_sk); /* final */ |
a046d57d UB |
679 | continue; |
680 | } | |
681 | if (new_sock) | |
682 | sock_graft(new_sk, new_sock); | |
683 | return new_sk; | |
684 | } | |
685 | return NULL; | |
686 | } | |
687 | ||
688 | /* clean up for a created but never accepted sock */ | |
b38d7324 | 689 | void smc_close_non_accepted(struct sock *sk) |
a046d57d UB |
690 | { |
691 | struct smc_sock *smc = smc_sk(sk); | |
692 | ||
b38d7324 UB |
693 | lock_sock(sk); |
694 | if (!sk->sk_lingertime) | |
695 | /* wait for peer closing */ | |
696 | sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; | |
51f1de79 | 697 | if (!smc->use_fallback) { |
b38d7324 | 698 | smc_close_active(smc); |
288c8390 UB |
699 | sock_set_flag(sk, SOCK_DEAD); |
700 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
701 | } | |
a046d57d UB |
702 | if (smc->clcsock) { |
703 | struct socket *tcp; | |
704 | ||
705 | tcp = smc->clcsock; | |
706 | smc->clcsock = NULL; | |
707 | sock_release(tcp); | |
708 | } | |
b38d7324 | 709 | if (smc->use_fallback) { |
51f1de79 UB |
710 | sock_put(sk); /* passive closing */ |
711 | sk->sk_state = SMC_CLOSED; | |
712 | } else { | |
713 | if (sk->sk_state == SMC_CLOSED) | |
714 | smc_conn_free(&smc->conn); | |
b38d7324 UB |
715 | } |
716 | release_sock(sk); | |
51f1de79 UB |
717 | sk->sk_prot->unhash(sk); |
718 | sock_put(sk); /* final sock_put */ | |
a046d57d UB |
719 | } |
720 | ||
9bf9abea UB |
721 | static int smc_serv_conf_first_link(struct smc_sock *smc) |
722 | { | |
723 | struct smc_link_group *lgr = smc->conn.lgr; | |
724 | struct smc_link *link; | |
725 | int rest; | |
726 | int rc; | |
727 | ||
728 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
652a1e41 UB |
729 | |
730 | rc = smc_wr_reg_send(link, | |
731 | smc->conn.rmb_desc->mr_rx[SMC_SINGLE_LINK]); | |
732 | if (rc) | |
733 | return SMC_CLC_DECL_INTERR; | |
734 | ||
9bf9abea UB |
735 | /* send CONFIRM LINK request to client over the RoCE fabric */ |
736 | rc = smc_llc_send_confirm_link(link, | |
737 | link->smcibdev->mac[link->ibport - 1], | |
738 | &link->smcibdev->gid[link->ibport - 1], | |
739 | SMC_LLC_REQ); | |
740 | if (rc < 0) | |
741 | return SMC_CLC_DECL_TCL; | |
742 | ||
743 | /* receive CONFIRM LINK response from client over the RoCE fabric */ | |
744 | rest = wait_for_completion_interruptible_timeout( | |
745 | &link->llc_confirm_resp, | |
746 | SMC_LLC_WAIT_FIRST_TIME); | |
747 | if (rest <= 0) { | |
748 | struct smc_clc_msg_decline dclc; | |
749 | ||
750 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
751 | SMC_CLC_DECLINE); | |
752 | } | |
753 | ||
754 | return rc; | |
755 | } | |
756 | ||
a046d57d UB |
757 | /* setup for RDMA connection of server */ |
758 | static void smc_listen_work(struct work_struct *work) | |
759 | { | |
760 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
761 | smc_listen_work); | |
e7b7a64a | 762 | struct smc_clc_msg_proposal_prefix *pclc_prfx; |
a046d57d UB |
763 | struct socket *newclcsock = new_smc->clcsock; |
764 | struct smc_sock *lsmc = new_smc->listen_smc; | |
765 | struct smc_clc_msg_accept_confirm cclc; | |
0cfdd8f9 | 766 | int local_contact = SMC_REUSE_CONTACT; |
a046d57d | 767 | struct sock *newsmcsk = &new_smc->sk; |
e7b7a64a | 768 | struct smc_clc_msg_proposal *pclc; |
a046d57d UB |
769 | struct smc_ib_device *smcibdev; |
770 | struct sockaddr_in peeraddr; | |
e7b7a64a | 771 | u8 buf[SMC_CLC_MAX_LEN]; |
0cfdd8f9 | 772 | struct smc_link *link; |
a046d57d UB |
773 | int reason_code = 0; |
774 | int rc = 0, len; | |
775 | __be32 subnet; | |
776 | u8 prefix_len; | |
777 | u8 ibport; | |
778 | ||
c5c1cc9c UB |
779 | /* check if peer is smc capable */ |
780 | if (!tcp_sk(newclcsock->sk)->syn_smc) { | |
781 | new_smc->use_fallback = true; | |
782 | goto out_connected; | |
783 | } | |
784 | ||
a046d57d UB |
785 | /* do inband token exchange - |
786 | *wait for and receive SMC Proposal CLC message | |
787 | */ | |
e7b7a64a | 788 | reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf), |
a046d57d UB |
789 | SMC_CLC_PROPOSAL); |
790 | if (reason_code < 0) | |
791 | goto out_err; | |
792 | if (reason_code > 0) | |
793 | goto decline_rdma; | |
794 | ||
795 | /* IPSec connections opt out of SMC-R optimizations */ | |
796 | if (using_ipsec(new_smc)) { | |
797 | reason_code = SMC_CLC_DECL_IPSEC; | |
798 | goto decline_rdma; | |
799 | } | |
800 | ||
801 | /* PNET table look up: search active ib_device and port | |
802 | * within same PNETID that also contains the ethernet device | |
803 | * used for the internal TCP socket | |
804 | */ | |
805 | smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport); | |
806 | if (!smcibdev) { | |
807 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
808 | goto decline_rdma; | |
809 | } | |
810 | ||
811 | /* determine subnet and mask from internal TCP socket */ | |
812 | rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len); | |
813 | if (rc) { | |
814 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
815 | goto decline_rdma; | |
816 | } | |
e7b7a64a UB |
817 | |
818 | pclc = (struct smc_clc_msg_proposal *)&buf; | |
819 | pclc_prfx = smc_clc_proposal_get_prefix(pclc); | |
820 | if (pclc_prfx->outgoing_subnet != subnet || | |
821 | pclc_prfx->prefix_len != prefix_len) { | |
a046d57d UB |
822 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ |
823 | goto decline_rdma; | |
824 | } | |
825 | ||
826 | /* get address of the peer connected to the internal TCP socket */ | |
827 | kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len); | |
828 | ||
0cfdd8f9 UB |
829 | /* allocate connection / link group */ |
830 | mutex_lock(&smc_create_lgr_pending); | |
831 | local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr, | |
e7b7a64a | 832 | smcibdev, ibport, &pclc->lcl, 0); |
0cfdd8f9 UB |
833 | if (local_contact < 0) { |
834 | rc = local_contact; | |
835 | if (rc == -ENOMEM) | |
836 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
145686ba | 837 | goto decline_rdma_unlock; |
0cfdd8f9 UB |
838 | } |
839 | link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 840 | |
3e034725 UB |
841 | /* create send buffer and rmb */ |
842 | rc = smc_buf_create(new_smc); | |
cd6851f3 UB |
843 | if (rc) { |
844 | reason_code = SMC_CLC_DECL_MEM; | |
145686ba | 845 | goto decline_rdma_unlock; |
cd6851f3 | 846 | } |
a046d57d | 847 | |
46c28dbd UB |
848 | smc_close_init(new_smc); |
849 | smc_rx_init(new_smc); | |
850 | ||
652a1e41 UB |
851 | if (local_contact != SMC_FIRST_CONTACT) { |
852 | struct smc_buf_desc *buf_desc = new_smc->conn.rmb_desc; | |
853 | ||
854 | if (!buf_desc->reused) { | |
855 | /* register memory region for new rmb */ | |
856 | rc = smc_wr_reg_send(link, | |
857 | buf_desc->mr_rx[SMC_SINGLE_LINK]); | |
858 | if (rc) { | |
859 | reason_code = SMC_CLC_DECL_INTERR; | |
145686ba | 860 | goto decline_rdma_unlock; |
652a1e41 UB |
861 | } |
862 | } | |
863 | } | |
10428dd8 | 864 | smc_rmb_sync_sg_for_device(&new_smc->conn); |
652a1e41 | 865 | |
0cfdd8f9 | 866 | rc = smc_clc_send_accept(new_smc, local_contact); |
a046d57d | 867 | if (rc) |
145686ba | 868 | goto out_err_unlock; |
a046d57d UB |
869 | |
870 | /* receive SMC Confirm CLC message */ | |
871 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
872 | SMC_CLC_CONFIRM); | |
873 | if (reason_code < 0) | |
145686ba | 874 | goto out_err_unlock; |
a046d57d | 875 | if (reason_code > 0) |
145686ba | 876 | goto decline_rdma_unlock; |
0cfdd8f9 UB |
877 | smc_conn_save_peer_info(new_smc, &cclc); |
878 | if (local_contact == SMC_FIRST_CONTACT) | |
879 | smc_link_save_peer_info(link, &cclc); | |
a046d57d | 880 | |
bd4ad577 UB |
881 | rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc); |
882 | if (rc) { | |
883 | reason_code = SMC_CLC_DECL_INTERR; | |
145686ba | 884 | goto decline_rdma_unlock; |
bd4ad577 UB |
885 | } |
886 | ||
bd4ad577 UB |
887 | if (local_contact == SMC_FIRST_CONTACT) { |
888 | rc = smc_ib_ready_link(link); | |
889 | if (rc) { | |
890 | reason_code = SMC_CLC_DECL_INTERR; | |
145686ba | 891 | goto decline_rdma_unlock; |
bd4ad577 | 892 | } |
9bf9abea UB |
893 | /* QP confirmation over RoCE fabric */ |
894 | reason_code = smc_serv_conf_first_link(new_smc); | |
0c9f1515 | 895 | if (reason_code < 0) |
9bf9abea | 896 | /* peer is not aware of a problem */ |
145686ba | 897 | goto out_err_unlock; |
9bf9abea | 898 | if (reason_code > 0) |
145686ba | 899 | goto decline_rdma_unlock; |
bd4ad577 | 900 | } |
a046d57d | 901 | |
e6727f39 | 902 | smc_tx_init(new_smc); |
145686ba | 903 | mutex_unlock(&smc_create_lgr_pending); |
e6727f39 | 904 | |
a046d57d UB |
905 | out_connected: |
906 | sk_refcnt_debug_inc(newsmcsk); | |
b38d7324 UB |
907 | if (newsmcsk->sk_state == SMC_INIT) |
908 | newsmcsk->sk_state = SMC_ACTIVE; | |
a046d57d | 909 | enqueue: |
b38d7324 | 910 | lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); |
a046d57d UB |
911 | if (lsmc->sk.sk_state == SMC_LISTEN) { |
912 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
913 | } else { /* no longer listening */ | |
914 | smc_close_non_accepted(newsmcsk); | |
915 | } | |
916 | release_sock(&lsmc->sk); | |
917 | ||
918 | /* Wake up accept */ | |
919 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
920 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
921 | return; | |
922 | ||
145686ba | 923 | decline_rdma_unlock: |
610db66f UB |
924 | if (local_contact == SMC_FIRST_CONTACT) |
925 | smc_lgr_forget(new_smc->conn.lgr); | |
145686ba | 926 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d UB |
927 | decline_rdma: |
928 | /* RDMA setup failed, switch back to TCP */ | |
0cfdd8f9 | 929 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
930 | new_smc->use_fallback = true; |
931 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
0c9f1515 | 932 | if (smc_clc_send_decline(new_smc, reason_code) < 0) |
a046d57d UB |
933 | goto out_err; |
934 | } | |
935 | goto out_connected; | |
936 | ||
145686ba | 937 | out_err_unlock: |
610db66f UB |
938 | if (local_contact == SMC_FIRST_CONTACT) |
939 | smc_lgr_forget(new_smc->conn.lgr); | |
145686ba | 940 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d | 941 | out_err: |
51f1de79 UB |
942 | if (newsmcsk->sk_state == SMC_INIT) |
943 | sock_put(&new_smc->sk); /* passive closing */ | |
a046d57d | 944 | newsmcsk->sk_state = SMC_CLOSED; |
b38d7324 | 945 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
946 | goto enqueue; /* queue new sock with sk_err set */ |
947 | } | |
948 | ||
949 | static void smc_tcp_listen_work(struct work_struct *work) | |
950 | { | |
951 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
952 | tcp_listen_work); | |
3163c507 | 953 | struct sock *lsk = &lsmc->sk; |
a046d57d UB |
954 | struct smc_sock *new_smc; |
955 | int rc = 0; | |
956 | ||
3163c507 UB |
957 | lock_sock(lsk); |
958 | while (lsk->sk_state == SMC_LISTEN) { | |
a046d57d UB |
959 | rc = smc_clcsock_accept(lsmc, &new_smc); |
960 | if (rc) | |
961 | goto out; | |
962 | if (!new_smc) | |
963 | continue; | |
964 | ||
965 | new_smc->listen_smc = lsmc; | |
966 | new_smc->use_fallback = false; /* assume rdma capability first*/ | |
3163c507 | 967 | sock_hold(lsk); /* sock_put in smc_listen_work */ |
a046d57d UB |
968 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); |
969 | smc_copy_sock_settings_to_smc(new_smc); | |
51f1de79 UB |
970 | sock_hold(&new_smc->sk); /* sock_put in passive closing */ |
971 | if (!schedule_work(&new_smc->smc_listen_work)) | |
972 | sock_put(&new_smc->sk); | |
a046d57d UB |
973 | } |
974 | ||
975 | out: | |
127f4970 UB |
976 | if (lsmc->clcsock) { |
977 | sock_release(lsmc->clcsock); | |
978 | lsmc->clcsock = NULL; | |
979 | } | |
3163c507 | 980 | release_sock(lsk); |
127f4970 UB |
981 | /* no more listening, wake up smc_close_wait_listen_clcsock and |
982 | * accept | |
983 | */ | |
984 | lsk->sk_state_change(lsk); | |
51f1de79 | 985 | sock_put(&lsmc->sk); /* sock_hold in smc_listen */ |
a046d57d UB |
986 | } |
987 | ||
ac713874 UB |
988 | static int smc_listen(struct socket *sock, int backlog) |
989 | { | |
990 | struct sock *sk = sock->sk; | |
991 | struct smc_sock *smc; | |
992 | int rc; | |
993 | ||
994 | smc = smc_sk(sk); | |
995 | lock_sock(sk); | |
996 | ||
997 | rc = -EINVAL; | |
998 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
999 | goto out; | |
1000 | ||
1001 | rc = 0; | |
1002 | if (sk->sk_state == SMC_LISTEN) { | |
1003 | sk->sk_max_ack_backlog = backlog; | |
1004 | goto out; | |
1005 | } | |
1006 | /* some socket options are handled in core, so we could not apply | |
1007 | * them to the clc socket -- copy smc socket options to clc socket | |
1008 | */ | |
1009 | smc_copy_sock_settings_to_clc(smc); | |
c5c1cc9c | 1010 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; |
ac713874 UB |
1011 | |
1012 | rc = kernel_listen(smc->clcsock, backlog); | |
1013 | if (rc) | |
1014 | goto out; | |
1015 | sk->sk_max_ack_backlog = backlog; | |
1016 | sk->sk_ack_backlog = 0; | |
1017 | sk->sk_state = SMC_LISTEN; | |
a046d57d | 1018 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
51f1de79 UB |
1019 | sock_hold(sk); /* sock_hold in tcp_listen_worker */ |
1020 | if (!schedule_work(&smc->tcp_listen_work)) | |
1021 | sock_put(sk); | |
ac713874 UB |
1022 | |
1023 | out: | |
1024 | release_sock(sk); | |
1025 | return rc; | |
1026 | } | |
1027 | ||
1028 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
cdfbabfb | 1029 | int flags, bool kern) |
ac713874 | 1030 | { |
a046d57d UB |
1031 | struct sock *sk = sock->sk, *nsk; |
1032 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 1033 | struct smc_sock *lsmc; |
a046d57d UB |
1034 | long timeo; |
1035 | int rc = 0; | |
ac713874 UB |
1036 | |
1037 | lsmc = smc_sk(sk); | |
51f1de79 | 1038 | sock_hold(sk); /* sock_put below */ |
ac713874 UB |
1039 | lock_sock(sk); |
1040 | ||
1041 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
1042 | rc = -EINVAL; | |
1043 | goto out; | |
1044 | } | |
1045 | ||
a046d57d UB |
1046 | /* Wait for an incoming connection */ |
1047 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1048 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
1049 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
1050 | set_current_state(TASK_INTERRUPTIBLE); | |
1051 | if (!timeo) { | |
1052 | rc = -EAGAIN; | |
1053 | break; | |
1054 | } | |
1055 | release_sock(sk); | |
1056 | timeo = schedule_timeout(timeo); | |
1057 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
1058 | sched_annotate_sleep(); | |
1059 | lock_sock(sk); | |
1060 | if (signal_pending(current)) { | |
1061 | rc = sock_intr_errno(timeo); | |
1062 | break; | |
1063 | } | |
1064 | } | |
1065 | set_current_state(TASK_RUNNING); | |
1066 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 1067 | |
a046d57d UB |
1068 | if (!rc) |
1069 | rc = sock_error(nsk); | |
ac713874 UB |
1070 | |
1071 | out: | |
1072 | release_sock(sk); | |
51f1de79 | 1073 | sock_put(sk); /* sock_hold above */ |
ac713874 UB |
1074 | return rc; |
1075 | } | |
1076 | ||
1077 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
1078 | int *len, int peer) | |
1079 | { | |
1080 | struct smc_sock *smc; | |
1081 | ||
b38d7324 UB |
1082 | if (peer && (sock->sk->sk_state != SMC_ACTIVE) && |
1083 | (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) | |
ac713874 UB |
1084 | return -ENOTCONN; |
1085 | ||
1086 | smc = smc_sk(sock->sk); | |
1087 | ||
1088 | return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer); | |
1089 | } | |
1090 | ||
1091 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
1092 | { | |
1093 | struct sock *sk = sock->sk; | |
1094 | struct smc_sock *smc; | |
1095 | int rc = -EPIPE; | |
1096 | ||
1097 | smc = smc_sk(sk); | |
1098 | lock_sock(sk); | |
b38d7324 UB |
1099 | if ((sk->sk_state != SMC_ACTIVE) && |
1100 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1101 | (sk->sk_state != SMC_INIT)) | |
ac713874 UB |
1102 | goto out; |
1103 | if (smc->use_fallback) | |
1104 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
1105 | else | |
e6727f39 | 1106 | rc = smc_tx_sendmsg(smc, msg, len); |
ac713874 UB |
1107 | out: |
1108 | release_sock(sk); | |
1109 | return rc; | |
1110 | } | |
1111 | ||
1112 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
1113 | int flags) | |
1114 | { | |
1115 | struct sock *sk = sock->sk; | |
1116 | struct smc_sock *smc; | |
1117 | int rc = -ENOTCONN; | |
1118 | ||
1119 | smc = smc_sk(sk); | |
1120 | lock_sock(sk); | |
b38d7324 UB |
1121 | if ((sk->sk_state == SMC_INIT) || |
1122 | (sk->sk_state == SMC_LISTEN) || | |
1123 | (sk->sk_state == SMC_CLOSED)) | |
ac713874 UB |
1124 | goto out; |
1125 | ||
b38d7324 UB |
1126 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { |
1127 | rc = 0; | |
1128 | goto out; | |
1129 | } | |
1130 | ||
ac713874 UB |
1131 | if (smc->use_fallback) |
1132 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); | |
1133 | else | |
952310cc | 1134 | rc = smc_rx_recvmsg(smc, msg, len, flags); |
b38d7324 | 1135 | |
ac713874 UB |
1136 | out: |
1137 | release_sock(sk); | |
1138 | return rc; | |
1139 | } | |
1140 | ||
ade994f4 | 1141 | static __poll_t smc_accept_poll(struct sock *parent) |
a046d57d | 1142 | { |
8dce2786 | 1143 | struct smc_sock *isk = smc_sk(parent); |
63e2480c | 1144 | __poll_t mask = 0; |
a046d57d | 1145 | |
8dce2786 UB |
1146 | spin_lock(&isk->accept_q_lock); |
1147 | if (!list_empty(&isk->accept_q)) | |
a9a08845 | 1148 | mask = EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1149 | spin_unlock(&isk->accept_q_lock); |
a046d57d | 1150 | |
8dce2786 | 1151 | return mask; |
a046d57d UB |
1152 | } |
1153 | ||
ade994f4 | 1154 | static __poll_t smc_poll(struct file *file, struct socket *sock, |
ac713874 UB |
1155 | poll_table *wait) |
1156 | { | |
1157 | struct sock *sk = sock->sk; | |
e6c8adca | 1158 | __poll_t mask = 0; |
ac713874 | 1159 | struct smc_sock *smc; |
a046d57d | 1160 | int rc; |
ac713874 | 1161 | |
8dce2786 | 1162 | if (!sk) |
a9a08845 | 1163 | return EPOLLNVAL; |
8dce2786 | 1164 | |
ac713874 | 1165 | smc = smc_sk(sock->sk); |
8dce2786 UB |
1166 | sock_hold(sk); |
1167 | lock_sock(sk); | |
a046d57d UB |
1168 | if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { |
1169 | /* delegate to CLC child sock */ | |
8dce2786 | 1170 | release_sock(sk); |
ac713874 UB |
1171 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
1172 | /* if non-blocking connect finished ... */ | |
1173 | lock_sock(sk); | |
a9a08845 | 1174 | if ((sk->sk_state == SMC_INIT) && (mask & EPOLLOUT)) { |
a046d57d UB |
1175 | sk->sk_err = smc->clcsock->sk->sk_err; |
1176 | if (sk->sk_err) { | |
a9a08845 | 1177 | mask |= EPOLLERR; |
a046d57d UB |
1178 | } else { |
1179 | rc = smc_connect_rdma(smc); | |
1180 | if (rc < 0) | |
a9a08845 | 1181 | mask |= EPOLLERR; |
8dce2786 | 1182 | /* success cases including fallback */ |
a9a08845 | 1183 | mask |= EPOLLOUT | EPOLLWRNORM; |
a046d57d | 1184 | } |
ac713874 | 1185 | } |
ac713874 | 1186 | } else { |
8dce2786 UB |
1187 | if (sk->sk_state != SMC_CLOSED) { |
1188 | release_sock(sk); | |
1189 | sock_poll_wait(file, sk_sleep(sk), wait); | |
1190 | lock_sock(sk); | |
1191 | } | |
a046d57d | 1192 | if (sk->sk_err) |
a9a08845 | 1193 | mask |= EPOLLERR; |
b38d7324 UB |
1194 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || |
1195 | (sk->sk_state == SMC_CLOSED)) | |
a9a08845 | 1196 | mask |= EPOLLHUP; |
8dce2786 UB |
1197 | if (sk->sk_state == SMC_LISTEN) { |
1198 | /* woken up by sk_data_ready in smc_listen_work() */ | |
1199 | mask = smc_accept_poll(sk); | |
1200 | } else { | |
1201 | if (atomic_read(&smc->conn.sndbuf_space) || | |
1202 | sk->sk_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 1203 | mask |= EPOLLOUT | EPOLLWRNORM; |
8dce2786 UB |
1204 | } else { |
1205 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1206 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1207 | } | |
1208 | if (atomic_read(&smc->conn.bytes_to_rcv)) | |
a9a08845 | 1209 | mask |= EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1210 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 1211 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
8dce2786 | 1212 | if (sk->sk_state == SMC_APPCLOSEWAIT1) |
a9a08845 | 1213 | mask |= EPOLLIN; |
8dce2786 | 1214 | } |
b38d7324 | 1215 | |
ac713874 | 1216 | } |
8dce2786 UB |
1217 | release_sock(sk); |
1218 | sock_put(sk); | |
ac713874 UB |
1219 | |
1220 | return mask; | |
1221 | } | |
1222 | ||
1223 | static int smc_shutdown(struct socket *sock, int how) | |
1224 | { | |
1225 | struct sock *sk = sock->sk; | |
1226 | struct smc_sock *smc; | |
1227 | int rc = -EINVAL; | |
b38d7324 | 1228 | int rc1 = 0; |
ac713874 UB |
1229 | |
1230 | smc = smc_sk(sk); | |
1231 | ||
1232 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
b38d7324 | 1233 | return rc; |
ac713874 UB |
1234 | |
1235 | lock_sock(sk); | |
1236 | ||
1237 | rc = -ENOTCONN; | |
b38d7324 UB |
1238 | if ((sk->sk_state != SMC_LISTEN) && |
1239 | (sk->sk_state != SMC_ACTIVE) && | |
1240 | (sk->sk_state != SMC_PEERCLOSEWAIT1) && | |
1241 | (sk->sk_state != SMC_PEERCLOSEWAIT2) && | |
1242 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1243 | (sk->sk_state != SMC_APPCLOSEWAIT2) && | |
1244 | (sk->sk_state != SMC_APPFINCLOSEWAIT)) | |
ac713874 UB |
1245 | goto out; |
1246 | if (smc->use_fallback) { | |
1247 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
1248 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
1249 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1250 | sk->sk_state = SMC_CLOSED; | |
b38d7324 | 1251 | goto out; |
ac713874 | 1252 | } |
b38d7324 UB |
1253 | switch (how) { |
1254 | case SHUT_RDWR: /* shutdown in both directions */ | |
1255 | rc = smc_close_active(smc); | |
1256 | break; | |
1257 | case SHUT_WR: | |
1258 | rc = smc_close_shutdown_write(smc); | |
1259 | break; | |
1260 | case SHUT_RD: | |
1261 | if (sk->sk_state == SMC_LISTEN) | |
1262 | rc = smc_close_active(smc); | |
1263 | else | |
1264 | rc = 0; | |
1265 | /* nothing more to do because peer is not involved */ | |
1266 | break; | |
1267 | } | |
1268 | rc1 = kernel_sock_shutdown(smc->clcsock, how); | |
1269 | /* map sock_shutdown_cmd constants to sk_shutdown value range */ | |
1270 | sk->sk_shutdown |= how + 1; | |
ac713874 UB |
1271 | |
1272 | out: | |
1273 | release_sock(sk); | |
b38d7324 | 1274 | return rc ? rc : rc1; |
ac713874 UB |
1275 | } |
1276 | ||
1277 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
1278 | char __user *optval, unsigned int optlen) | |
1279 | { | |
1280 | struct sock *sk = sock->sk; | |
1281 | struct smc_sock *smc; | |
1282 | ||
1283 | smc = smc_sk(sk); | |
1284 | ||
1285 | /* generic setsockopts reaching us here always apply to the | |
1286 | * CLC socket | |
1287 | */ | |
1288 | return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, | |
1289 | optval, optlen); | |
1290 | } | |
1291 | ||
1292 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
1293 | char __user *optval, int __user *optlen) | |
1294 | { | |
1295 | struct smc_sock *smc; | |
1296 | ||
1297 | smc = smc_sk(sock->sk); | |
1298 | /* socket options apply to the CLC socket */ | |
1299 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
1300 | optval, optlen); | |
1301 | } | |
1302 | ||
1303 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
1304 | unsigned long arg) | |
1305 | { | |
1306 | struct smc_sock *smc; | |
1307 | ||
1308 | smc = smc_sk(sock->sk); | |
1309 | if (smc->use_fallback) | |
1310 | return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); | |
1311 | else | |
1312 | return sock_no_ioctl(sock, cmd, arg); | |
1313 | } | |
1314 | ||
1315 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
1316 | int offset, size_t size, int flags) | |
1317 | { | |
1318 | struct sock *sk = sock->sk; | |
1319 | struct smc_sock *smc; | |
1320 | int rc = -EPIPE; | |
1321 | ||
1322 | smc = smc_sk(sk); | |
1323 | lock_sock(sk); | |
1324 | if (sk->sk_state != SMC_ACTIVE) | |
1325 | goto out; | |
1326 | if (smc->use_fallback) | |
1327 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
1328 | size, flags); | |
1329 | else | |
1330 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
1331 | ||
1332 | out: | |
1333 | release_sock(sk); | |
1334 | return rc; | |
1335 | } | |
1336 | ||
1337 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, | |
1338 | struct pipe_inode_info *pipe, size_t len, | |
1339 | unsigned int flags) | |
1340 | { | |
1341 | struct sock *sk = sock->sk; | |
1342 | struct smc_sock *smc; | |
1343 | int rc = -ENOTCONN; | |
1344 | ||
1345 | smc = smc_sk(sk); | |
1346 | lock_sock(sk); | |
1347 | if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) | |
1348 | goto out; | |
1349 | if (smc->use_fallback) { | |
1350 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
1351 | pipe, len, flags); | |
1352 | } else { | |
1353 | rc = -EOPNOTSUPP; | |
1354 | } | |
1355 | out: | |
1356 | release_sock(sk); | |
1357 | return rc; | |
1358 | } | |
1359 | ||
1360 | /* must look like tcp */ | |
1361 | static const struct proto_ops smc_sock_ops = { | |
1362 | .family = PF_SMC, | |
1363 | .owner = THIS_MODULE, | |
1364 | .release = smc_release, | |
1365 | .bind = smc_bind, | |
1366 | .connect = smc_connect, | |
1367 | .socketpair = sock_no_socketpair, | |
1368 | .accept = smc_accept, | |
1369 | .getname = smc_getname, | |
1370 | .poll = smc_poll, | |
1371 | .ioctl = smc_ioctl, | |
1372 | .listen = smc_listen, | |
1373 | .shutdown = smc_shutdown, | |
1374 | .setsockopt = smc_setsockopt, | |
1375 | .getsockopt = smc_getsockopt, | |
1376 | .sendmsg = smc_sendmsg, | |
1377 | .recvmsg = smc_recvmsg, | |
1378 | .mmap = sock_no_mmap, | |
1379 | .sendpage = smc_sendpage, | |
1380 | .splice_read = smc_splice_read, | |
1381 | }; | |
1382 | ||
1383 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1384 | int kern) | |
1385 | { | |
1386 | struct smc_sock *smc; | |
1387 | struct sock *sk; | |
1388 | int rc; | |
1389 | ||
1390 | rc = -ESOCKTNOSUPPORT; | |
1391 | if (sock->type != SOCK_STREAM) | |
1392 | goto out; | |
1393 | ||
1394 | rc = -EPROTONOSUPPORT; | |
1395 | if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP)) | |
1396 | goto out; | |
1397 | ||
1398 | rc = -ENOBUFS; | |
1399 | sock->ops = &smc_sock_ops; | |
1400 | sk = smc_sock_alloc(net, sock); | |
1401 | if (!sk) | |
1402 | goto out; | |
1403 | ||
1404 | /* create internal TCP socket for CLC handshake and fallback */ | |
1405 | smc = smc_sk(sk); | |
a046d57d | 1406 | smc->use_fallback = false; /* assume rdma capability first */ |
ac713874 UB |
1407 | rc = sock_create_kern(net, PF_INET, SOCK_STREAM, |
1408 | IPPROTO_TCP, &smc->clcsock); | |
1409 | if (rc) | |
1410 | sk_common_release(sk); | |
cd6851f3 UB |
1411 | smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
1412 | smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); | |
ac713874 UB |
1413 | |
1414 | out: | |
1415 | return rc; | |
1416 | } | |
1417 | ||
1418 | static const struct net_proto_family smc_sock_family_ops = { | |
1419 | .family = PF_SMC, | |
1420 | .owner = THIS_MODULE, | |
1421 | .create = smc_create, | |
1422 | }; | |
1423 | ||
1424 | static int __init smc_init(void) | |
1425 | { | |
1426 | int rc; | |
1427 | ||
6812baab TR |
1428 | rc = smc_pnet_init(); |
1429 | if (rc) | |
1430 | return rc; | |
1431 | ||
9bf9abea UB |
1432 | rc = smc_llc_init(); |
1433 | if (rc) { | |
1434 | pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); | |
1435 | goto out_pnet; | |
1436 | } | |
1437 | ||
5f08318f UB |
1438 | rc = smc_cdc_init(); |
1439 | if (rc) { | |
1440 | pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); | |
1441 | goto out_pnet; | |
1442 | } | |
1443 | ||
ac713874 UB |
1444 | rc = proto_register(&smc_proto, 1); |
1445 | if (rc) { | |
1446 | pr_err("%s: proto_register fails with %d\n", __func__, rc); | |
6812baab | 1447 | goto out_pnet; |
ac713874 UB |
1448 | } |
1449 | ||
1450 | rc = sock_register(&smc_sock_family_ops); | |
1451 | if (rc) { | |
1452 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
1453 | goto out_proto; | |
1454 | } | |
f16a7dd5 | 1455 | INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); |
ac713874 | 1456 | |
a4cf0443 UB |
1457 | rc = smc_ib_register_client(); |
1458 | if (rc) { | |
1459 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
1460 | goto out_sock; | |
1461 | } | |
1462 | ||
c5c1cc9c | 1463 | static_branch_enable(&tcp_have_smc); |
ac713874 UB |
1464 | return 0; |
1465 | ||
a4cf0443 UB |
1466 | out_sock: |
1467 | sock_unregister(PF_SMC); | |
ac713874 UB |
1468 | out_proto: |
1469 | proto_unregister(&smc_proto); | |
6812baab TR |
1470 | out_pnet: |
1471 | smc_pnet_exit(); | |
ac713874 UB |
1472 | return rc; |
1473 | } | |
1474 | ||
1475 | static void __exit smc_exit(void) | |
1476 | { | |
0cfdd8f9 UB |
1477 | struct smc_link_group *lgr, *lg; |
1478 | LIST_HEAD(lgr_freeing_list); | |
1479 | ||
1480 | spin_lock_bh(&smc_lgr_list.lock); | |
1481 | if (!list_empty(&smc_lgr_list.list)) | |
1482 | list_splice_init(&smc_lgr_list.list, &lgr_freeing_list); | |
1483 | spin_unlock_bh(&smc_lgr_list.lock); | |
1484 | list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) { | |
1485 | list_del_init(&lgr->list); | |
1486 | smc_lgr_free(lgr); /* free link group */ | |
1487 | } | |
c5c1cc9c | 1488 | static_branch_disable(&tcp_have_smc); |
a4cf0443 | 1489 | smc_ib_unregister_client(); |
ac713874 UB |
1490 | sock_unregister(PF_SMC); |
1491 | proto_unregister(&smc_proto); | |
6812baab | 1492 | smc_pnet_exit(); |
ac713874 UB |
1493 | } |
1494 | ||
1495 | module_init(smc_init); | |
1496 | module_exit(smc_exit); | |
1497 | ||
1498 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
1499 | MODULE_DESCRIPTION("smc socket address family"); | |
1500 | MODULE_LICENSE("GPL"); | |
1501 | MODULE_ALIAS_NETPROTO(PF_SMC); |