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Commit | Line | Data |
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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> | |
ac713874 | 29 | #include <net/sock.h> |
a046d57d | 30 | #include <net/tcp.h> |
ac713874 UB |
31 | |
32 | #include "smc.h" | |
a046d57d | 33 | #include "smc_clc.h" |
0cfdd8f9 | 34 | #include "smc_core.h" |
a4cf0443 | 35 | #include "smc_ib.h" |
6812baab | 36 | #include "smc_pnet.h" |
ac713874 | 37 | |
0cfdd8f9 UB |
38 | static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group |
39 | * creation | |
40 | */ | |
41 | ||
42 | struct smc_lgr_list smc_lgr_list = { /* established link groups */ | |
43 | .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), | |
44 | .list = LIST_HEAD_INIT(smc_lgr_list.list), | |
45 | }; | |
46 | ||
a046d57d UB |
47 | static void smc_tcp_listen_work(struct work_struct *); |
48 | ||
ac713874 UB |
49 | static void smc_set_keepalive(struct sock *sk, int val) |
50 | { | |
51 | struct smc_sock *smc = smc_sk(sk); | |
52 | ||
53 | smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); | |
54 | } | |
55 | ||
56 | static struct proto smc_proto = { | |
57 | .name = "SMC", | |
58 | .owner = THIS_MODULE, | |
59 | .keepalive = smc_set_keepalive, | |
60 | .obj_size = sizeof(struct smc_sock), | |
61 | .slab_flags = SLAB_DESTROY_BY_RCU, | |
62 | }; | |
63 | ||
64 | static int smc_release(struct socket *sock) | |
65 | { | |
66 | struct sock *sk = sock->sk; | |
67 | struct smc_sock *smc; | |
68 | ||
69 | if (!sk) | |
70 | goto out; | |
71 | ||
72 | smc = smc_sk(sk); | |
73 | lock_sock(sk); | |
74 | ||
75 | sk->sk_state = SMC_CLOSED; | |
76 | if (smc->clcsock) { | |
77 | sock_release(smc->clcsock); | |
78 | smc->clcsock = NULL; | |
79 | } | |
80 | ||
81 | /* detach socket */ | |
82 | sock_orphan(sk); | |
83 | sock->sk = NULL; | |
84 | release_sock(sk); | |
85 | ||
86 | sock_put(sk); | |
87 | out: | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static void smc_destruct(struct sock *sk) | |
92 | { | |
93 | if (sk->sk_state != SMC_CLOSED) | |
94 | return; | |
95 | if (!sock_flag(sk, SOCK_DEAD)) | |
96 | return; | |
97 | ||
98 | sk_refcnt_debug_dec(sk); | |
99 | } | |
100 | ||
101 | static struct sock *smc_sock_alloc(struct net *net, struct socket *sock) | |
102 | { | |
103 | struct smc_sock *smc; | |
104 | struct sock *sk; | |
105 | ||
106 | sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0); | |
107 | if (!sk) | |
108 | return NULL; | |
109 | ||
110 | sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ | |
111 | sk->sk_state = SMC_INIT; | |
112 | sk->sk_destruct = smc_destruct; | |
113 | sk->sk_protocol = SMCPROTO_SMC; | |
ac713874 | 114 | smc = smc_sk(sk); |
a046d57d UB |
115 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
116 | INIT_LIST_HEAD(&smc->accept_q); | |
117 | spin_lock_init(&smc->accept_q_lock); | |
118 | sk_refcnt_debug_inc(sk); | |
ac713874 UB |
119 | |
120 | return sk; | |
121 | } | |
122 | ||
123 | static int smc_bind(struct socket *sock, struct sockaddr *uaddr, | |
124 | int addr_len) | |
125 | { | |
126 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
127 | struct sock *sk = sock->sk; | |
128 | struct smc_sock *smc; | |
129 | int rc; | |
130 | ||
131 | smc = smc_sk(sk); | |
132 | ||
133 | /* replicate tests from inet_bind(), to be safe wrt. future changes */ | |
134 | rc = -EINVAL; | |
135 | if (addr_len < sizeof(struct sockaddr_in)) | |
136 | goto out; | |
137 | ||
138 | rc = -EAFNOSUPPORT; | |
139 | /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ | |
140 | if ((addr->sin_family != AF_INET) && | |
141 | ((addr->sin_family != AF_UNSPEC) || | |
142 | (addr->sin_addr.s_addr != htonl(INADDR_ANY)))) | |
143 | goto out; | |
144 | ||
145 | lock_sock(sk); | |
146 | ||
147 | /* Check if socket is already active */ | |
148 | rc = -EINVAL; | |
149 | if (sk->sk_state != SMC_INIT) | |
150 | goto out_rel; | |
151 | ||
152 | smc->clcsock->sk->sk_reuse = sk->sk_reuse; | |
153 | rc = kernel_bind(smc->clcsock, uaddr, addr_len); | |
154 | ||
155 | out_rel: | |
156 | release_sock(sk); | |
157 | out: | |
158 | return rc; | |
159 | } | |
160 | ||
161 | static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, | |
162 | unsigned long mask) | |
163 | { | |
164 | /* options we don't get control via setsockopt for */ | |
165 | nsk->sk_type = osk->sk_type; | |
166 | nsk->sk_sndbuf = osk->sk_sndbuf; | |
167 | nsk->sk_rcvbuf = osk->sk_rcvbuf; | |
168 | nsk->sk_sndtimeo = osk->sk_sndtimeo; | |
169 | nsk->sk_rcvtimeo = osk->sk_rcvtimeo; | |
170 | nsk->sk_mark = osk->sk_mark; | |
171 | nsk->sk_priority = osk->sk_priority; | |
172 | nsk->sk_rcvlowat = osk->sk_rcvlowat; | |
173 | nsk->sk_bound_dev_if = osk->sk_bound_dev_if; | |
174 | nsk->sk_err = osk->sk_err; | |
175 | ||
176 | nsk->sk_flags &= ~mask; | |
177 | nsk->sk_flags |= osk->sk_flags & mask; | |
178 | } | |
179 | ||
180 | #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ | |
181 | (1UL << SOCK_KEEPOPEN) | \ | |
182 | (1UL << SOCK_LINGER) | \ | |
183 | (1UL << SOCK_BROADCAST) | \ | |
184 | (1UL << SOCK_TIMESTAMP) | \ | |
185 | (1UL << SOCK_DBG) | \ | |
186 | (1UL << SOCK_RCVTSTAMP) | \ | |
187 | (1UL << SOCK_RCVTSTAMPNS) | \ | |
188 | (1UL << SOCK_LOCALROUTE) | \ | |
189 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
190 | (1UL << SOCK_RXQ_OVFL) | \ | |
191 | (1UL << SOCK_WIFI_STATUS) | \ | |
192 | (1UL << SOCK_NOFCS) | \ | |
193 | (1UL << SOCK_FILTER_LOCKED)) | |
194 | /* copy only relevant settings and flags of SOL_SOCKET level from smc to | |
195 | * clc socket (since smc is not called for these options from net/core) | |
196 | */ | |
197 | static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) | |
198 | { | |
199 | smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); | |
200 | } | |
201 | ||
202 | #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ | |
203 | (1UL << SOCK_KEEPOPEN) | \ | |
204 | (1UL << SOCK_LINGER) | \ | |
205 | (1UL << SOCK_DBG)) | |
206 | /* copy only settings and flags relevant for smc from clc to smc socket */ | |
207 | static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) | |
208 | { | |
209 | smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); | |
210 | } | |
211 | ||
a046d57d UB |
212 | /* determine subnet and mask of internal TCP socket */ |
213 | int smc_netinfo_by_tcpsk(struct socket *clcsock, | |
214 | __be32 *subnet, u8 *prefix_len) | |
215 | { | |
216 | struct dst_entry *dst = sk_dst_get(clcsock->sk); | |
217 | struct sockaddr_in addr; | |
218 | int rc = -ENOENT; | |
219 | int len; | |
220 | ||
221 | if (!dst) { | |
222 | rc = -ENOTCONN; | |
223 | goto out; | |
224 | } | |
225 | if (!dst->dev) { | |
226 | rc = -ENODEV; | |
227 | goto out_rel; | |
228 | } | |
229 | ||
230 | /* get address to which the internal TCP socket is bound */ | |
231 | kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len); | |
232 | /* analyze IPv4 specific data of net_device belonging to TCP socket */ | |
233 | for_ifa(dst->dev->ip_ptr) { | |
234 | if (ifa->ifa_address != addr.sin_addr.s_addr) | |
235 | continue; | |
236 | *prefix_len = inet_mask_len(ifa->ifa_mask); | |
237 | *subnet = ifa->ifa_address & ifa->ifa_mask; | |
238 | rc = 0; | |
239 | break; | |
240 | } endfor_ifa(dst->dev->ip_ptr); | |
241 | ||
242 | out_rel: | |
243 | dst_release(dst); | |
244 | out: | |
245 | return rc; | |
246 | } | |
247 | ||
0cfdd8f9 UB |
248 | static void smc_conn_save_peer_info(struct smc_sock *smc, |
249 | struct smc_clc_msg_accept_confirm *clc) | |
250 | { | |
251 | smc->conn.peer_conn_idx = clc->conn_idx; | |
252 | } | |
253 | ||
254 | static void smc_link_save_peer_info(struct smc_link *link, | |
255 | struct smc_clc_msg_accept_confirm *clc) | |
256 | { | |
257 | link->peer_qpn = ntoh24(clc->qpn); | |
258 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
259 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
260 | link->peer_psn = ntoh24(clc->psn); | |
261 | link->peer_mtu = clc->qp_mtu; | |
262 | } | |
263 | ||
a046d57d UB |
264 | /* setup for RDMA connection of client */ |
265 | static int smc_connect_rdma(struct smc_sock *smc) | |
266 | { | |
0cfdd8f9 | 267 | struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr; |
a046d57d | 268 | struct smc_clc_msg_accept_confirm aclc; |
0cfdd8f9 | 269 | int local_contact = SMC_FIRST_CONTACT; |
a046d57d | 270 | struct smc_ib_device *smcibdev; |
0cfdd8f9 UB |
271 | struct smc_link *link; |
272 | u8 srv_first_contact; | |
a046d57d UB |
273 | int reason_code = 0; |
274 | int rc = 0; | |
275 | u8 ibport; | |
276 | ||
277 | /* IPSec connections opt out of SMC-R optimizations */ | |
278 | if (using_ipsec(smc)) { | |
279 | reason_code = SMC_CLC_DECL_IPSEC; | |
280 | goto decline_rdma; | |
281 | } | |
282 | ||
283 | /* PNET table look up: search active ib_device and port | |
284 | * within same PNETID that also contains the ethernet device | |
285 | * used for the internal TCP socket | |
286 | */ | |
287 | smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport); | |
288 | if (!smcibdev) { | |
289 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
290 | goto decline_rdma; | |
291 | } | |
292 | ||
293 | /* do inband token exchange */ | |
294 | reason_code = smc_clc_send_proposal(smc, smcibdev, ibport); | |
295 | if (reason_code < 0) { | |
296 | rc = reason_code; | |
297 | goto out_err; | |
298 | } | |
299 | if (reason_code > 0) /* configuration error */ | |
300 | goto decline_rdma; | |
301 | /* receive SMC Accept CLC message */ | |
302 | reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc), | |
303 | SMC_CLC_ACCEPT); | |
304 | if (reason_code < 0) { | |
305 | rc = reason_code; | |
306 | goto out_err; | |
307 | } | |
308 | if (reason_code > 0) | |
309 | goto decline_rdma; | |
310 | ||
0cfdd8f9 UB |
311 | srv_first_contact = aclc.hdr.flag; |
312 | mutex_lock(&smc_create_lgr_pending); | |
313 | local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev, | |
314 | ibport, &aclc.lcl, srv_first_contact); | |
315 | if (local_contact < 0) { | |
316 | rc = local_contact; | |
317 | if (rc == -ENOMEM) | |
318 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
319 | else if (rc == -ENOLINK) | |
320 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
321 | goto decline_rdma_unlock; | |
322 | } | |
323 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 324 | |
0cfdd8f9 UB |
325 | smc_conn_save_peer_info(smc, &aclc); |
326 | if (local_contact == SMC_FIRST_CONTACT) | |
327 | smc_link_save_peer_info(link, &aclc); | |
a046d57d UB |
328 | /* tbd in follow-on patch: more steps to setup RDMA communcication, |
329 | * create rmbs, map rmbs, rtoken_handling, modify_qp | |
330 | */ | |
331 | ||
332 | rc = smc_clc_send_confirm(smc); | |
333 | if (rc) | |
0cfdd8f9 | 334 | goto out_err_unlock; |
a046d57d UB |
335 | |
336 | /* tbd in follow-on patch: llc_confirm */ | |
337 | ||
0cfdd8f9 | 338 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d UB |
339 | out_connected: |
340 | smc_copy_sock_settings_to_clc(smc); | |
341 | smc->sk.sk_state = SMC_ACTIVE; | |
342 | ||
0cfdd8f9 | 343 | return rc ? rc : local_contact; |
a046d57d | 344 | |
0cfdd8f9 UB |
345 | decline_rdma_unlock: |
346 | mutex_unlock(&smc_create_lgr_pending); | |
347 | smc_conn_free(&smc->conn); | |
a046d57d UB |
348 | decline_rdma: |
349 | /* RDMA setup failed, switch back to TCP */ | |
350 | smc->use_fallback = true; | |
351 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
352 | rc = smc_clc_send_decline(smc, reason_code, 0); | |
353 | if (rc < sizeof(struct smc_clc_msg_decline)) | |
354 | goto out_err; | |
355 | } | |
356 | goto out_connected; | |
357 | ||
0cfdd8f9 UB |
358 | out_err_unlock: |
359 | mutex_unlock(&smc_create_lgr_pending); | |
360 | smc_conn_free(&smc->conn); | |
a046d57d UB |
361 | out_err: |
362 | return rc; | |
363 | } | |
364 | ||
ac713874 UB |
365 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
366 | int alen, int flags) | |
367 | { | |
368 | struct sock *sk = sock->sk; | |
369 | struct smc_sock *smc; | |
370 | int rc = -EINVAL; | |
371 | ||
372 | smc = smc_sk(sk); | |
373 | ||
374 | /* separate smc parameter checking to be safe */ | |
375 | if (alen < sizeof(addr->sa_family)) | |
376 | goto out_err; | |
377 | if (addr->sa_family != AF_INET) | |
378 | goto out_err; | |
a046d57d | 379 | smc->addr = addr; /* needed for nonblocking connect */ |
ac713874 UB |
380 | |
381 | lock_sock(sk); | |
382 | switch (sk->sk_state) { | |
383 | default: | |
384 | goto out; | |
385 | case SMC_ACTIVE: | |
386 | rc = -EISCONN; | |
387 | goto out; | |
388 | case SMC_INIT: | |
389 | rc = 0; | |
390 | break; | |
391 | } | |
392 | ||
393 | smc_copy_sock_settings_to_clc(smc); | |
394 | rc = kernel_connect(smc->clcsock, addr, alen, flags); | |
395 | if (rc) | |
396 | goto out; | |
397 | ||
a046d57d UB |
398 | /* setup RDMA connection */ |
399 | rc = smc_connect_rdma(smc); | |
400 | if (rc < 0) | |
401 | goto out; | |
402 | else | |
403 | rc = 0; /* success cases including fallback */ | |
ac713874 UB |
404 | |
405 | out: | |
406 | release_sock(sk); | |
407 | out_err: | |
408 | return rc; | |
409 | } | |
410 | ||
411 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
412 | { | |
413 | struct sock *sk = &lsmc->sk; | |
414 | struct socket *new_clcsock; | |
415 | struct sock *new_sk; | |
416 | int rc; | |
417 | ||
a046d57d | 418 | release_sock(&lsmc->sk); |
ac713874 UB |
419 | new_sk = smc_sock_alloc(sock_net(sk), NULL); |
420 | if (!new_sk) { | |
421 | rc = -ENOMEM; | |
422 | lsmc->sk.sk_err = ENOMEM; | |
423 | *new_smc = NULL; | |
a046d57d | 424 | lock_sock(&lsmc->sk); |
ac713874 UB |
425 | goto out; |
426 | } | |
427 | *new_smc = smc_sk(new_sk); | |
428 | ||
429 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
a046d57d UB |
430 | lock_sock(&lsmc->sk); |
431 | if (rc < 0) { | |
432 | lsmc->sk.sk_err = -rc; | |
433 | new_sk->sk_state = SMC_CLOSED; | |
434 | sock_set_flag(new_sk, SOCK_DEAD); | |
435 | sock_put(new_sk); | |
436 | *new_smc = NULL; | |
437 | goto out; | |
438 | } | |
439 | if (lsmc->sk.sk_state == SMC_CLOSED) { | |
440 | if (new_clcsock) | |
441 | sock_release(new_clcsock); | |
442 | new_sk->sk_state = SMC_CLOSED; | |
443 | sock_set_flag(new_sk, SOCK_DEAD); | |
ac713874 UB |
444 | sock_put(new_sk); |
445 | *new_smc = NULL; | |
446 | goto out; | |
447 | } | |
448 | ||
449 | (*new_smc)->clcsock = new_clcsock; | |
450 | out: | |
451 | return rc; | |
452 | } | |
453 | ||
a046d57d UB |
454 | /* add a just created sock to the accept queue of the listen sock as |
455 | * candidate for a following socket accept call from user space | |
456 | */ | |
457 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
458 | { | |
459 | struct smc_sock *par = smc_sk(parent); | |
460 | ||
461 | sock_hold(sk); | |
462 | spin_lock(&par->accept_q_lock); | |
463 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
464 | spin_unlock(&par->accept_q_lock); | |
465 | sk_acceptq_added(parent); | |
466 | } | |
467 | ||
468 | /* remove a socket from the accept queue of its parental listening socket */ | |
469 | static void smc_accept_unlink(struct sock *sk) | |
470 | { | |
471 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
472 | ||
473 | spin_lock(&par->accept_q_lock); | |
474 | list_del_init(&smc_sk(sk)->accept_q); | |
475 | spin_unlock(&par->accept_q_lock); | |
476 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
477 | sock_put(sk); | |
478 | } | |
479 | ||
480 | /* remove a sock from the accept queue to bind it to a new socket created | |
481 | * for a socket accept call from user space | |
482 | */ | |
483 | static struct sock *smc_accept_dequeue(struct sock *parent, | |
484 | struct socket *new_sock) | |
485 | { | |
486 | struct smc_sock *isk, *n; | |
487 | struct sock *new_sk; | |
488 | ||
489 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
490 | new_sk = (struct sock *)isk; | |
491 | ||
492 | smc_accept_unlink(new_sk); | |
493 | if (new_sk->sk_state == SMC_CLOSED) { | |
494 | /* tbd in follow-on patch: close this sock */ | |
495 | continue; | |
496 | } | |
497 | if (new_sock) | |
498 | sock_graft(new_sk, new_sock); | |
499 | return new_sk; | |
500 | } | |
501 | return NULL; | |
502 | } | |
503 | ||
504 | /* clean up for a created but never accepted sock */ | |
505 | static void smc_close_non_accepted(struct sock *sk) | |
506 | { | |
507 | struct smc_sock *smc = smc_sk(sk); | |
508 | ||
509 | sock_hold(sk); | |
510 | if (smc->clcsock) { | |
511 | struct socket *tcp; | |
512 | ||
513 | tcp = smc->clcsock; | |
514 | smc->clcsock = NULL; | |
515 | sock_release(tcp); | |
516 | } | |
517 | /* more closing stuff to be added with socket closing patch */ | |
518 | sock_put(sk); | |
519 | } | |
520 | ||
521 | /* setup for RDMA connection of server */ | |
522 | static void smc_listen_work(struct work_struct *work) | |
523 | { | |
524 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
525 | smc_listen_work); | |
526 | struct socket *newclcsock = new_smc->clcsock; | |
527 | struct smc_sock *lsmc = new_smc->listen_smc; | |
528 | struct smc_clc_msg_accept_confirm cclc; | |
0cfdd8f9 | 529 | int local_contact = SMC_REUSE_CONTACT; |
a046d57d UB |
530 | struct sock *newsmcsk = &new_smc->sk; |
531 | struct smc_clc_msg_proposal pclc; | |
532 | struct smc_ib_device *smcibdev; | |
533 | struct sockaddr_in peeraddr; | |
0cfdd8f9 | 534 | struct smc_link *link; |
a046d57d UB |
535 | int reason_code = 0; |
536 | int rc = 0, len; | |
537 | __be32 subnet; | |
538 | u8 prefix_len; | |
539 | u8 ibport; | |
540 | ||
541 | /* do inband token exchange - | |
542 | *wait for and receive SMC Proposal CLC message | |
543 | */ | |
544 | reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc), | |
545 | SMC_CLC_PROPOSAL); | |
546 | if (reason_code < 0) | |
547 | goto out_err; | |
548 | if (reason_code > 0) | |
549 | goto decline_rdma; | |
550 | ||
551 | /* IPSec connections opt out of SMC-R optimizations */ | |
552 | if (using_ipsec(new_smc)) { | |
553 | reason_code = SMC_CLC_DECL_IPSEC; | |
554 | goto decline_rdma; | |
555 | } | |
556 | ||
557 | /* PNET table look up: search active ib_device and port | |
558 | * within same PNETID that also contains the ethernet device | |
559 | * used for the internal TCP socket | |
560 | */ | |
561 | smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport); | |
562 | if (!smcibdev) { | |
563 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
564 | goto decline_rdma; | |
565 | } | |
566 | ||
567 | /* determine subnet and mask from internal TCP socket */ | |
568 | rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len); | |
569 | if (rc) { | |
570 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
571 | goto decline_rdma; | |
572 | } | |
573 | if ((pclc.outgoing_subnet != subnet) || | |
574 | (pclc.prefix_len != prefix_len)) { | |
575 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
576 | goto decline_rdma; | |
577 | } | |
578 | ||
579 | /* get address of the peer connected to the internal TCP socket */ | |
580 | kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len); | |
581 | ||
0cfdd8f9 UB |
582 | /* allocate connection / link group */ |
583 | mutex_lock(&smc_create_lgr_pending); | |
584 | local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr, | |
585 | smcibdev, ibport, &pclc.lcl, 0); | |
586 | if (local_contact == SMC_REUSE_CONTACT) | |
587 | /* lock no longer needed, free it due to following | |
588 | * smc_clc_wait_msg() call | |
589 | */ | |
590 | mutex_unlock(&smc_create_lgr_pending); | |
591 | if (local_contact < 0) { | |
592 | rc = local_contact; | |
593 | if (rc == -ENOMEM) | |
594 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
595 | else if (rc == -ENOLINK) | |
596 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
597 | goto decline_rdma; | |
598 | } | |
599 | link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d UB |
600 | |
601 | /* tbd in follow-on patch: more steps to setup RDMA communcication, | |
602 | * create rmbs, map rmbs | |
603 | */ | |
604 | ||
0cfdd8f9 | 605 | rc = smc_clc_send_accept(new_smc, local_contact); |
a046d57d UB |
606 | if (rc) |
607 | goto out_err; | |
608 | ||
609 | /* receive SMC Confirm CLC message */ | |
610 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
611 | SMC_CLC_CONFIRM); | |
612 | if (reason_code < 0) | |
613 | goto out_err; | |
614 | if (reason_code > 0) | |
615 | goto decline_rdma; | |
0cfdd8f9 UB |
616 | smc_conn_save_peer_info(new_smc, &cclc); |
617 | if (local_contact == SMC_FIRST_CONTACT) | |
618 | smc_link_save_peer_info(link, &cclc); | |
a046d57d UB |
619 | |
620 | /* tbd in follow-on patch: more steps to setup RDMA communcication, | |
621 | * rtoken_handling, modify_qp | |
622 | */ | |
623 | ||
624 | out_connected: | |
625 | sk_refcnt_debug_inc(newsmcsk); | |
626 | newsmcsk->sk_state = SMC_ACTIVE; | |
627 | enqueue: | |
0cfdd8f9 UB |
628 | if (local_contact == SMC_FIRST_CONTACT) |
629 | mutex_unlock(&smc_create_lgr_pending); | |
a046d57d UB |
630 | lock_sock(&lsmc->sk); |
631 | if (lsmc->sk.sk_state == SMC_LISTEN) { | |
632 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
633 | } else { /* no longer listening */ | |
634 | smc_close_non_accepted(newsmcsk); | |
635 | } | |
636 | release_sock(&lsmc->sk); | |
637 | ||
638 | /* Wake up accept */ | |
639 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
640 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
641 | return; | |
642 | ||
643 | decline_rdma: | |
644 | /* RDMA setup failed, switch back to TCP */ | |
0cfdd8f9 | 645 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
646 | new_smc->use_fallback = true; |
647 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
648 | rc = smc_clc_send_decline(new_smc, reason_code, 0); | |
649 | if (rc < sizeof(struct smc_clc_msg_decline)) | |
650 | goto out_err; | |
651 | } | |
652 | goto out_connected; | |
653 | ||
654 | out_err: | |
655 | newsmcsk->sk_state = SMC_CLOSED; | |
656 | goto enqueue; /* queue new sock with sk_err set */ | |
657 | } | |
658 | ||
659 | static void smc_tcp_listen_work(struct work_struct *work) | |
660 | { | |
661 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
662 | tcp_listen_work); | |
663 | struct smc_sock *new_smc; | |
664 | int rc = 0; | |
665 | ||
666 | lock_sock(&lsmc->sk); | |
667 | while (lsmc->sk.sk_state == SMC_LISTEN) { | |
668 | rc = smc_clcsock_accept(lsmc, &new_smc); | |
669 | if (rc) | |
670 | goto out; | |
671 | if (!new_smc) | |
672 | continue; | |
673 | ||
674 | new_smc->listen_smc = lsmc; | |
675 | new_smc->use_fallback = false; /* assume rdma capability first*/ | |
676 | sock_hold(&lsmc->sk); /* sock_put in smc_listen_work */ | |
677 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); | |
678 | smc_copy_sock_settings_to_smc(new_smc); | |
679 | schedule_work(&new_smc->smc_listen_work); | |
680 | } | |
681 | ||
682 | out: | |
683 | release_sock(&lsmc->sk); | |
684 | lsmc->sk.sk_data_ready(&lsmc->sk); /* no more listening, wake accept */ | |
685 | } | |
686 | ||
ac713874 UB |
687 | static int smc_listen(struct socket *sock, int backlog) |
688 | { | |
689 | struct sock *sk = sock->sk; | |
690 | struct smc_sock *smc; | |
691 | int rc; | |
692 | ||
693 | smc = smc_sk(sk); | |
694 | lock_sock(sk); | |
695 | ||
696 | rc = -EINVAL; | |
697 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
698 | goto out; | |
699 | ||
700 | rc = 0; | |
701 | if (sk->sk_state == SMC_LISTEN) { | |
702 | sk->sk_max_ack_backlog = backlog; | |
703 | goto out; | |
704 | } | |
705 | /* some socket options are handled in core, so we could not apply | |
706 | * them to the clc socket -- copy smc socket options to clc socket | |
707 | */ | |
708 | smc_copy_sock_settings_to_clc(smc); | |
709 | ||
710 | rc = kernel_listen(smc->clcsock, backlog); | |
711 | if (rc) | |
712 | goto out; | |
713 | sk->sk_max_ack_backlog = backlog; | |
714 | sk->sk_ack_backlog = 0; | |
715 | sk->sk_state = SMC_LISTEN; | |
a046d57d UB |
716 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
717 | schedule_work(&smc->tcp_listen_work); | |
ac713874 UB |
718 | |
719 | out: | |
720 | release_sock(sk); | |
721 | return rc; | |
722 | } | |
723 | ||
724 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
725 | int flags) | |
726 | { | |
a046d57d UB |
727 | struct sock *sk = sock->sk, *nsk; |
728 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 729 | struct smc_sock *lsmc; |
a046d57d UB |
730 | long timeo; |
731 | int rc = 0; | |
ac713874 UB |
732 | |
733 | lsmc = smc_sk(sk); | |
734 | lock_sock(sk); | |
735 | ||
736 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
737 | rc = -EINVAL; | |
738 | goto out; | |
739 | } | |
740 | ||
a046d57d UB |
741 | /* Wait for an incoming connection */ |
742 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
743 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
744 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
745 | set_current_state(TASK_INTERRUPTIBLE); | |
746 | if (!timeo) { | |
747 | rc = -EAGAIN; | |
748 | break; | |
749 | } | |
750 | release_sock(sk); | |
751 | timeo = schedule_timeout(timeo); | |
752 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
753 | sched_annotate_sleep(); | |
754 | lock_sock(sk); | |
755 | if (signal_pending(current)) { | |
756 | rc = sock_intr_errno(timeo); | |
757 | break; | |
758 | } | |
759 | } | |
760 | set_current_state(TASK_RUNNING); | |
761 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 762 | |
a046d57d UB |
763 | if (!rc) |
764 | rc = sock_error(nsk); | |
ac713874 UB |
765 | |
766 | out: | |
767 | release_sock(sk); | |
768 | return rc; | |
769 | } | |
770 | ||
771 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
772 | int *len, int peer) | |
773 | { | |
774 | struct smc_sock *smc; | |
775 | ||
776 | if (peer && (sock->sk->sk_state != SMC_ACTIVE)) | |
777 | return -ENOTCONN; | |
778 | ||
779 | smc = smc_sk(sock->sk); | |
780 | ||
781 | return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer); | |
782 | } | |
783 | ||
784 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
785 | { | |
786 | struct sock *sk = sock->sk; | |
787 | struct smc_sock *smc; | |
788 | int rc = -EPIPE; | |
789 | ||
790 | smc = smc_sk(sk); | |
791 | lock_sock(sk); | |
792 | if (sk->sk_state != SMC_ACTIVE) | |
793 | goto out; | |
794 | if (smc->use_fallback) | |
795 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
796 | else | |
797 | rc = sock_no_sendmsg(sock, msg, len); | |
798 | out: | |
799 | release_sock(sk); | |
800 | return rc; | |
801 | } | |
802 | ||
803 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
804 | int flags) | |
805 | { | |
806 | struct sock *sk = sock->sk; | |
807 | struct smc_sock *smc; | |
808 | int rc = -ENOTCONN; | |
809 | ||
810 | smc = smc_sk(sk); | |
811 | lock_sock(sk); | |
812 | if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) | |
813 | goto out; | |
814 | ||
815 | if (smc->use_fallback) | |
816 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); | |
817 | else | |
818 | rc = sock_no_recvmsg(sock, msg, len, flags); | |
819 | out: | |
820 | release_sock(sk); | |
821 | return rc; | |
822 | } | |
823 | ||
a046d57d UB |
824 | static unsigned int smc_accept_poll(struct sock *parent) |
825 | { | |
826 | struct smc_sock *isk; | |
827 | struct sock *sk; | |
828 | ||
829 | lock_sock(parent); | |
830 | list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) { | |
831 | sk = (struct sock *)isk; | |
832 | ||
833 | if (sk->sk_state == SMC_ACTIVE) { | |
834 | release_sock(parent); | |
835 | return POLLIN | POLLRDNORM; | |
836 | } | |
837 | } | |
838 | release_sock(parent); | |
839 | ||
840 | return 0; | |
841 | } | |
842 | ||
ac713874 UB |
843 | static unsigned int smc_poll(struct file *file, struct socket *sock, |
844 | poll_table *wait) | |
845 | { | |
846 | struct sock *sk = sock->sk; | |
847 | unsigned int mask = 0; | |
848 | struct smc_sock *smc; | |
a046d57d | 849 | int rc; |
ac713874 UB |
850 | |
851 | smc = smc_sk(sock->sk); | |
a046d57d UB |
852 | if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { |
853 | /* delegate to CLC child sock */ | |
ac713874 UB |
854 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
855 | /* if non-blocking connect finished ... */ | |
856 | lock_sock(sk); | |
857 | if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) { | |
a046d57d UB |
858 | sk->sk_err = smc->clcsock->sk->sk_err; |
859 | if (sk->sk_err) { | |
860 | mask |= POLLERR; | |
861 | } else { | |
862 | rc = smc_connect_rdma(smc); | |
863 | if (rc < 0) | |
864 | mask |= POLLERR; | |
865 | else | |
866 | /* success cases including fallback */ | |
867 | mask |= POLLOUT | POLLWRNORM; | |
868 | } | |
ac713874 UB |
869 | } |
870 | release_sock(sk); | |
871 | } else { | |
a046d57d UB |
872 | sock_poll_wait(file, sk_sleep(sk), wait); |
873 | if (sk->sk_state == SMC_LISTEN) | |
874 | /* woken up by sk_data_ready in smc_listen_work() */ | |
875 | mask |= smc_accept_poll(sk); | |
876 | if (sk->sk_err) | |
877 | mask |= POLLERR; | |
878 | /* for now - to be enhanced in follow-on patch */ | |
ac713874 UB |
879 | } |
880 | ||
881 | return mask; | |
882 | } | |
883 | ||
884 | static int smc_shutdown(struct socket *sock, int how) | |
885 | { | |
886 | struct sock *sk = sock->sk; | |
887 | struct smc_sock *smc; | |
888 | int rc = -EINVAL; | |
889 | ||
890 | smc = smc_sk(sk); | |
891 | ||
892 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
893 | goto out_err; | |
894 | ||
895 | lock_sock(sk); | |
896 | ||
897 | rc = -ENOTCONN; | |
898 | if (sk->sk_state == SMC_CLOSED) | |
899 | goto out; | |
900 | if (smc->use_fallback) { | |
901 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
902 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
903 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
904 | sk->sk_state = SMC_CLOSED; | |
905 | } else { | |
906 | rc = sock_no_shutdown(sock, how); | |
907 | } | |
908 | ||
909 | out: | |
910 | release_sock(sk); | |
911 | ||
912 | out_err: | |
913 | return rc; | |
914 | } | |
915 | ||
916 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
917 | char __user *optval, unsigned int optlen) | |
918 | { | |
919 | struct sock *sk = sock->sk; | |
920 | struct smc_sock *smc; | |
921 | ||
922 | smc = smc_sk(sk); | |
923 | ||
924 | /* generic setsockopts reaching us here always apply to the | |
925 | * CLC socket | |
926 | */ | |
927 | return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, | |
928 | optval, optlen); | |
929 | } | |
930 | ||
931 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
932 | char __user *optval, int __user *optlen) | |
933 | { | |
934 | struct smc_sock *smc; | |
935 | ||
936 | smc = smc_sk(sock->sk); | |
937 | /* socket options apply to the CLC socket */ | |
938 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
939 | optval, optlen); | |
940 | } | |
941 | ||
942 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
943 | unsigned long arg) | |
944 | { | |
945 | struct smc_sock *smc; | |
946 | ||
947 | smc = smc_sk(sock->sk); | |
948 | if (smc->use_fallback) | |
949 | return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); | |
950 | else | |
951 | return sock_no_ioctl(sock, cmd, arg); | |
952 | } | |
953 | ||
954 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
955 | int offset, size_t size, int flags) | |
956 | { | |
957 | struct sock *sk = sock->sk; | |
958 | struct smc_sock *smc; | |
959 | int rc = -EPIPE; | |
960 | ||
961 | smc = smc_sk(sk); | |
962 | lock_sock(sk); | |
963 | if (sk->sk_state != SMC_ACTIVE) | |
964 | goto out; | |
965 | if (smc->use_fallback) | |
966 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
967 | size, flags); | |
968 | else | |
969 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
970 | ||
971 | out: | |
972 | release_sock(sk); | |
973 | return rc; | |
974 | } | |
975 | ||
976 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, | |
977 | struct pipe_inode_info *pipe, size_t len, | |
978 | unsigned int flags) | |
979 | { | |
980 | struct sock *sk = sock->sk; | |
981 | struct smc_sock *smc; | |
982 | int rc = -ENOTCONN; | |
983 | ||
984 | smc = smc_sk(sk); | |
985 | lock_sock(sk); | |
986 | if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) | |
987 | goto out; | |
988 | if (smc->use_fallback) { | |
989 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
990 | pipe, len, flags); | |
991 | } else { | |
992 | rc = -EOPNOTSUPP; | |
993 | } | |
994 | out: | |
995 | release_sock(sk); | |
996 | return rc; | |
997 | } | |
998 | ||
999 | /* must look like tcp */ | |
1000 | static const struct proto_ops smc_sock_ops = { | |
1001 | .family = PF_SMC, | |
1002 | .owner = THIS_MODULE, | |
1003 | .release = smc_release, | |
1004 | .bind = smc_bind, | |
1005 | .connect = smc_connect, | |
1006 | .socketpair = sock_no_socketpair, | |
1007 | .accept = smc_accept, | |
1008 | .getname = smc_getname, | |
1009 | .poll = smc_poll, | |
1010 | .ioctl = smc_ioctl, | |
1011 | .listen = smc_listen, | |
1012 | .shutdown = smc_shutdown, | |
1013 | .setsockopt = smc_setsockopt, | |
1014 | .getsockopt = smc_getsockopt, | |
1015 | .sendmsg = smc_sendmsg, | |
1016 | .recvmsg = smc_recvmsg, | |
1017 | .mmap = sock_no_mmap, | |
1018 | .sendpage = smc_sendpage, | |
1019 | .splice_read = smc_splice_read, | |
1020 | }; | |
1021 | ||
1022 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1023 | int kern) | |
1024 | { | |
1025 | struct smc_sock *smc; | |
1026 | struct sock *sk; | |
1027 | int rc; | |
1028 | ||
1029 | rc = -ESOCKTNOSUPPORT; | |
1030 | if (sock->type != SOCK_STREAM) | |
1031 | goto out; | |
1032 | ||
1033 | rc = -EPROTONOSUPPORT; | |
1034 | if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP)) | |
1035 | goto out; | |
1036 | ||
1037 | rc = -ENOBUFS; | |
1038 | sock->ops = &smc_sock_ops; | |
1039 | sk = smc_sock_alloc(net, sock); | |
1040 | if (!sk) | |
1041 | goto out; | |
1042 | ||
1043 | /* create internal TCP socket for CLC handshake and fallback */ | |
1044 | smc = smc_sk(sk); | |
a046d57d | 1045 | smc->use_fallback = false; /* assume rdma capability first */ |
ac713874 UB |
1046 | rc = sock_create_kern(net, PF_INET, SOCK_STREAM, |
1047 | IPPROTO_TCP, &smc->clcsock); | |
1048 | if (rc) | |
1049 | sk_common_release(sk); | |
1050 | ||
1051 | out: | |
1052 | return rc; | |
1053 | } | |
1054 | ||
1055 | static const struct net_proto_family smc_sock_family_ops = { | |
1056 | .family = PF_SMC, | |
1057 | .owner = THIS_MODULE, | |
1058 | .create = smc_create, | |
1059 | }; | |
1060 | ||
1061 | static int __init smc_init(void) | |
1062 | { | |
1063 | int rc; | |
1064 | ||
6812baab TR |
1065 | rc = smc_pnet_init(); |
1066 | if (rc) | |
1067 | return rc; | |
1068 | ||
ac713874 UB |
1069 | rc = proto_register(&smc_proto, 1); |
1070 | if (rc) { | |
1071 | pr_err("%s: proto_register fails with %d\n", __func__, rc); | |
6812baab | 1072 | goto out_pnet; |
ac713874 UB |
1073 | } |
1074 | ||
1075 | rc = sock_register(&smc_sock_family_ops); | |
1076 | if (rc) { | |
1077 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
1078 | goto out_proto; | |
1079 | } | |
1080 | ||
a4cf0443 UB |
1081 | rc = smc_ib_register_client(); |
1082 | if (rc) { | |
1083 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
1084 | goto out_sock; | |
1085 | } | |
1086 | ||
ac713874 UB |
1087 | return 0; |
1088 | ||
a4cf0443 UB |
1089 | out_sock: |
1090 | sock_unregister(PF_SMC); | |
ac713874 UB |
1091 | out_proto: |
1092 | proto_unregister(&smc_proto); | |
6812baab TR |
1093 | out_pnet: |
1094 | smc_pnet_exit(); | |
ac713874 UB |
1095 | return rc; |
1096 | } | |
1097 | ||
1098 | static void __exit smc_exit(void) | |
1099 | { | |
0cfdd8f9 UB |
1100 | struct smc_link_group *lgr, *lg; |
1101 | LIST_HEAD(lgr_freeing_list); | |
1102 | ||
1103 | spin_lock_bh(&smc_lgr_list.lock); | |
1104 | if (!list_empty(&smc_lgr_list.list)) | |
1105 | list_splice_init(&smc_lgr_list.list, &lgr_freeing_list); | |
1106 | spin_unlock_bh(&smc_lgr_list.lock); | |
1107 | list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) { | |
1108 | list_del_init(&lgr->list); | |
1109 | smc_lgr_free(lgr); /* free link group */ | |
1110 | } | |
a4cf0443 | 1111 | smc_ib_unregister_client(); |
ac713874 UB |
1112 | sock_unregister(PF_SMC); |
1113 | proto_unregister(&smc_proto); | |
6812baab | 1114 | smc_pnet_exit(); |
ac713874 UB |
1115 | } |
1116 | ||
1117 | module_init(smc_init); | |
1118 | module_exit(smc_exit); | |
1119 | ||
1120 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
1121 | MODULE_DESCRIPTION("smc socket address family"); | |
1122 | MODULE_LICENSE("GPL"); | |
1123 | MODULE_ALIAS_NETPROTO(PF_SMC); |