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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; | |
cd6851f3 UB |
252 | smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size); |
253 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); | |
0cfdd8f9 UB |
254 | } |
255 | ||
256 | static void smc_link_save_peer_info(struct smc_link *link, | |
257 | struct smc_clc_msg_accept_confirm *clc) | |
258 | { | |
259 | link->peer_qpn = ntoh24(clc->qpn); | |
260 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
261 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
262 | link->peer_psn = ntoh24(clc->psn); | |
263 | link->peer_mtu = clc->qp_mtu; | |
264 | } | |
265 | ||
a046d57d UB |
266 | /* setup for RDMA connection of client */ |
267 | static int smc_connect_rdma(struct smc_sock *smc) | |
268 | { | |
0cfdd8f9 | 269 | struct sockaddr_in *inaddr = (struct sockaddr_in *)smc->addr; |
a046d57d | 270 | struct smc_clc_msg_accept_confirm aclc; |
0cfdd8f9 | 271 | int local_contact = SMC_FIRST_CONTACT; |
a046d57d | 272 | struct smc_ib_device *smcibdev; |
0cfdd8f9 UB |
273 | struct smc_link *link; |
274 | u8 srv_first_contact; | |
a046d57d UB |
275 | int reason_code = 0; |
276 | int rc = 0; | |
277 | u8 ibport; | |
278 | ||
279 | /* IPSec connections opt out of SMC-R optimizations */ | |
280 | if (using_ipsec(smc)) { | |
281 | reason_code = SMC_CLC_DECL_IPSEC; | |
282 | goto decline_rdma; | |
283 | } | |
284 | ||
285 | /* PNET table look up: search active ib_device and port | |
286 | * within same PNETID that also contains the ethernet device | |
287 | * used for the internal TCP socket | |
288 | */ | |
289 | smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport); | |
290 | if (!smcibdev) { | |
291 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
292 | goto decline_rdma; | |
293 | } | |
294 | ||
295 | /* do inband token exchange */ | |
296 | reason_code = smc_clc_send_proposal(smc, smcibdev, ibport); | |
297 | if (reason_code < 0) { | |
298 | rc = reason_code; | |
299 | goto out_err; | |
300 | } | |
301 | if (reason_code > 0) /* configuration error */ | |
302 | goto decline_rdma; | |
303 | /* receive SMC Accept CLC message */ | |
304 | reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc), | |
305 | SMC_CLC_ACCEPT); | |
306 | if (reason_code < 0) { | |
307 | rc = reason_code; | |
308 | goto out_err; | |
309 | } | |
310 | if (reason_code > 0) | |
311 | goto decline_rdma; | |
312 | ||
0cfdd8f9 UB |
313 | srv_first_contact = aclc.hdr.flag; |
314 | mutex_lock(&smc_create_lgr_pending); | |
315 | local_contact = smc_conn_create(smc, inaddr->sin_addr.s_addr, smcibdev, | |
316 | ibport, &aclc.lcl, srv_first_contact); | |
317 | if (local_contact < 0) { | |
318 | rc = local_contact; | |
319 | if (rc == -ENOMEM) | |
320 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
321 | else if (rc == -ENOLINK) | |
322 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
323 | goto decline_rdma_unlock; | |
324 | } | |
325 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 326 | |
0cfdd8f9 | 327 | smc_conn_save_peer_info(smc, &aclc); |
cd6851f3 UB |
328 | |
329 | rc = smc_sndbuf_create(smc); | |
330 | if (rc) { | |
331 | reason_code = SMC_CLC_DECL_MEM; | |
332 | goto decline_rdma_unlock; | |
333 | } | |
334 | rc = smc_rmb_create(smc); | |
335 | if (rc) { | |
336 | reason_code = SMC_CLC_DECL_MEM; | |
337 | goto decline_rdma_unlock; | |
338 | } | |
339 | ||
0cfdd8f9 UB |
340 | if (local_contact == SMC_FIRST_CONTACT) |
341 | smc_link_save_peer_info(link, &aclc); | |
a046d57d UB |
342 | /* tbd in follow-on patch: more steps to setup RDMA communcication, |
343 | * create rmbs, map rmbs, rtoken_handling, modify_qp | |
344 | */ | |
345 | ||
346 | rc = smc_clc_send_confirm(smc); | |
347 | if (rc) | |
0cfdd8f9 | 348 | goto out_err_unlock; |
a046d57d UB |
349 | |
350 | /* tbd in follow-on patch: llc_confirm */ | |
351 | ||
0cfdd8f9 | 352 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d UB |
353 | out_connected: |
354 | smc_copy_sock_settings_to_clc(smc); | |
355 | smc->sk.sk_state = SMC_ACTIVE; | |
356 | ||
0cfdd8f9 | 357 | return rc ? rc : local_contact; |
a046d57d | 358 | |
0cfdd8f9 UB |
359 | decline_rdma_unlock: |
360 | mutex_unlock(&smc_create_lgr_pending); | |
361 | smc_conn_free(&smc->conn); | |
a046d57d UB |
362 | decline_rdma: |
363 | /* RDMA setup failed, switch back to TCP */ | |
364 | smc->use_fallback = true; | |
365 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
366 | rc = smc_clc_send_decline(smc, reason_code, 0); | |
367 | if (rc < sizeof(struct smc_clc_msg_decline)) | |
368 | goto out_err; | |
369 | } | |
370 | goto out_connected; | |
371 | ||
0cfdd8f9 UB |
372 | out_err_unlock: |
373 | mutex_unlock(&smc_create_lgr_pending); | |
374 | smc_conn_free(&smc->conn); | |
a046d57d UB |
375 | out_err: |
376 | return rc; | |
377 | } | |
378 | ||
ac713874 UB |
379 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
380 | int alen, int flags) | |
381 | { | |
382 | struct sock *sk = sock->sk; | |
383 | struct smc_sock *smc; | |
384 | int rc = -EINVAL; | |
385 | ||
386 | smc = smc_sk(sk); | |
387 | ||
388 | /* separate smc parameter checking to be safe */ | |
389 | if (alen < sizeof(addr->sa_family)) | |
390 | goto out_err; | |
391 | if (addr->sa_family != AF_INET) | |
392 | goto out_err; | |
a046d57d | 393 | smc->addr = addr; /* needed for nonblocking connect */ |
ac713874 UB |
394 | |
395 | lock_sock(sk); | |
396 | switch (sk->sk_state) { | |
397 | default: | |
398 | goto out; | |
399 | case SMC_ACTIVE: | |
400 | rc = -EISCONN; | |
401 | goto out; | |
402 | case SMC_INIT: | |
403 | rc = 0; | |
404 | break; | |
405 | } | |
406 | ||
407 | smc_copy_sock_settings_to_clc(smc); | |
408 | rc = kernel_connect(smc->clcsock, addr, alen, flags); | |
409 | if (rc) | |
410 | goto out; | |
411 | ||
a046d57d UB |
412 | /* setup RDMA connection */ |
413 | rc = smc_connect_rdma(smc); | |
414 | if (rc < 0) | |
415 | goto out; | |
416 | else | |
417 | rc = 0; /* success cases including fallback */ | |
ac713874 UB |
418 | |
419 | out: | |
420 | release_sock(sk); | |
421 | out_err: | |
422 | return rc; | |
423 | } | |
424 | ||
425 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
426 | { | |
427 | struct sock *sk = &lsmc->sk; | |
428 | struct socket *new_clcsock; | |
429 | struct sock *new_sk; | |
430 | int rc; | |
431 | ||
a046d57d | 432 | release_sock(&lsmc->sk); |
ac713874 UB |
433 | new_sk = smc_sock_alloc(sock_net(sk), NULL); |
434 | if (!new_sk) { | |
435 | rc = -ENOMEM; | |
436 | lsmc->sk.sk_err = ENOMEM; | |
437 | *new_smc = NULL; | |
a046d57d | 438 | lock_sock(&lsmc->sk); |
ac713874 UB |
439 | goto out; |
440 | } | |
441 | *new_smc = smc_sk(new_sk); | |
442 | ||
443 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
a046d57d UB |
444 | lock_sock(&lsmc->sk); |
445 | if (rc < 0) { | |
446 | lsmc->sk.sk_err = -rc; | |
447 | new_sk->sk_state = SMC_CLOSED; | |
448 | sock_set_flag(new_sk, SOCK_DEAD); | |
449 | sock_put(new_sk); | |
450 | *new_smc = NULL; | |
451 | goto out; | |
452 | } | |
453 | if (lsmc->sk.sk_state == SMC_CLOSED) { | |
454 | if (new_clcsock) | |
455 | sock_release(new_clcsock); | |
456 | new_sk->sk_state = SMC_CLOSED; | |
457 | sock_set_flag(new_sk, SOCK_DEAD); | |
ac713874 UB |
458 | sock_put(new_sk); |
459 | *new_smc = NULL; | |
460 | goto out; | |
461 | } | |
462 | ||
463 | (*new_smc)->clcsock = new_clcsock; | |
464 | out: | |
465 | return rc; | |
466 | } | |
467 | ||
a046d57d UB |
468 | /* add a just created sock to the accept queue of the listen sock as |
469 | * candidate for a following socket accept call from user space | |
470 | */ | |
471 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
472 | { | |
473 | struct smc_sock *par = smc_sk(parent); | |
474 | ||
475 | sock_hold(sk); | |
476 | spin_lock(&par->accept_q_lock); | |
477 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
478 | spin_unlock(&par->accept_q_lock); | |
479 | sk_acceptq_added(parent); | |
480 | } | |
481 | ||
482 | /* remove a socket from the accept queue of its parental listening socket */ | |
483 | static void smc_accept_unlink(struct sock *sk) | |
484 | { | |
485 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
486 | ||
487 | spin_lock(&par->accept_q_lock); | |
488 | list_del_init(&smc_sk(sk)->accept_q); | |
489 | spin_unlock(&par->accept_q_lock); | |
490 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
491 | sock_put(sk); | |
492 | } | |
493 | ||
494 | /* remove a sock from the accept queue to bind it to a new socket created | |
495 | * for a socket accept call from user space | |
496 | */ | |
497 | static struct sock *smc_accept_dequeue(struct sock *parent, | |
498 | struct socket *new_sock) | |
499 | { | |
500 | struct smc_sock *isk, *n; | |
501 | struct sock *new_sk; | |
502 | ||
503 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
504 | new_sk = (struct sock *)isk; | |
505 | ||
506 | smc_accept_unlink(new_sk); | |
507 | if (new_sk->sk_state == SMC_CLOSED) { | |
508 | /* tbd in follow-on patch: close this sock */ | |
509 | continue; | |
510 | } | |
511 | if (new_sock) | |
512 | sock_graft(new_sk, new_sock); | |
513 | return new_sk; | |
514 | } | |
515 | return NULL; | |
516 | } | |
517 | ||
518 | /* clean up for a created but never accepted sock */ | |
519 | static void smc_close_non_accepted(struct sock *sk) | |
520 | { | |
521 | struct smc_sock *smc = smc_sk(sk); | |
522 | ||
523 | sock_hold(sk); | |
524 | if (smc->clcsock) { | |
525 | struct socket *tcp; | |
526 | ||
527 | tcp = smc->clcsock; | |
528 | smc->clcsock = NULL; | |
529 | sock_release(tcp); | |
530 | } | |
531 | /* more closing stuff to be added with socket closing patch */ | |
532 | sock_put(sk); | |
533 | } | |
534 | ||
535 | /* setup for RDMA connection of server */ | |
536 | static void smc_listen_work(struct work_struct *work) | |
537 | { | |
538 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
539 | smc_listen_work); | |
540 | struct socket *newclcsock = new_smc->clcsock; | |
541 | struct smc_sock *lsmc = new_smc->listen_smc; | |
542 | struct smc_clc_msg_accept_confirm cclc; | |
0cfdd8f9 | 543 | int local_contact = SMC_REUSE_CONTACT; |
a046d57d UB |
544 | struct sock *newsmcsk = &new_smc->sk; |
545 | struct smc_clc_msg_proposal pclc; | |
546 | struct smc_ib_device *smcibdev; | |
547 | struct sockaddr_in peeraddr; | |
0cfdd8f9 | 548 | struct smc_link *link; |
a046d57d UB |
549 | int reason_code = 0; |
550 | int rc = 0, len; | |
551 | __be32 subnet; | |
552 | u8 prefix_len; | |
553 | u8 ibport; | |
554 | ||
555 | /* do inband token exchange - | |
556 | *wait for and receive SMC Proposal CLC message | |
557 | */ | |
558 | reason_code = smc_clc_wait_msg(new_smc, &pclc, sizeof(pclc), | |
559 | SMC_CLC_PROPOSAL); | |
560 | if (reason_code < 0) | |
561 | goto out_err; | |
562 | if (reason_code > 0) | |
563 | goto decline_rdma; | |
564 | ||
565 | /* IPSec connections opt out of SMC-R optimizations */ | |
566 | if (using_ipsec(new_smc)) { | |
567 | reason_code = SMC_CLC_DECL_IPSEC; | |
568 | goto decline_rdma; | |
569 | } | |
570 | ||
571 | /* PNET table look up: search active ib_device and port | |
572 | * within same PNETID that also contains the ethernet device | |
573 | * used for the internal TCP socket | |
574 | */ | |
575 | smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport); | |
576 | if (!smcibdev) { | |
577 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
578 | goto decline_rdma; | |
579 | } | |
580 | ||
581 | /* determine subnet and mask from internal TCP socket */ | |
582 | rc = smc_netinfo_by_tcpsk(newclcsock, &subnet, &prefix_len); | |
583 | if (rc) { | |
584 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
585 | goto decline_rdma; | |
586 | } | |
587 | if ((pclc.outgoing_subnet != subnet) || | |
588 | (pclc.prefix_len != prefix_len)) { | |
589 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
590 | goto decline_rdma; | |
591 | } | |
592 | ||
593 | /* get address of the peer connected to the internal TCP socket */ | |
594 | kernel_getpeername(newclcsock, (struct sockaddr *)&peeraddr, &len); | |
595 | ||
0cfdd8f9 UB |
596 | /* allocate connection / link group */ |
597 | mutex_lock(&smc_create_lgr_pending); | |
598 | local_contact = smc_conn_create(new_smc, peeraddr.sin_addr.s_addr, | |
599 | smcibdev, ibport, &pclc.lcl, 0); | |
600 | if (local_contact == SMC_REUSE_CONTACT) | |
601 | /* lock no longer needed, free it due to following | |
602 | * smc_clc_wait_msg() call | |
603 | */ | |
604 | mutex_unlock(&smc_create_lgr_pending); | |
605 | if (local_contact < 0) { | |
606 | rc = local_contact; | |
607 | if (rc == -ENOMEM) | |
608 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
609 | else if (rc == -ENOLINK) | |
610 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
611 | goto decline_rdma; | |
612 | } | |
613 | link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 614 | |
cd6851f3 UB |
615 | rc = smc_sndbuf_create(new_smc); |
616 | if (rc) { | |
617 | reason_code = SMC_CLC_DECL_MEM; | |
618 | goto decline_rdma; | |
619 | } | |
620 | rc = smc_rmb_create(new_smc); | |
621 | if (rc) { | |
622 | reason_code = SMC_CLC_DECL_MEM; | |
623 | goto decline_rdma; | |
624 | } | |
a046d57d | 625 | |
0cfdd8f9 | 626 | rc = smc_clc_send_accept(new_smc, local_contact); |
a046d57d UB |
627 | if (rc) |
628 | goto out_err; | |
629 | ||
630 | /* receive SMC Confirm CLC message */ | |
631 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
632 | SMC_CLC_CONFIRM); | |
633 | if (reason_code < 0) | |
634 | goto out_err; | |
635 | if (reason_code > 0) | |
636 | goto decline_rdma; | |
0cfdd8f9 UB |
637 | smc_conn_save_peer_info(new_smc, &cclc); |
638 | if (local_contact == SMC_FIRST_CONTACT) | |
639 | smc_link_save_peer_info(link, &cclc); | |
a046d57d UB |
640 | |
641 | /* tbd in follow-on patch: more steps to setup RDMA communcication, | |
642 | * rtoken_handling, modify_qp | |
643 | */ | |
644 | ||
645 | out_connected: | |
646 | sk_refcnt_debug_inc(newsmcsk); | |
647 | newsmcsk->sk_state = SMC_ACTIVE; | |
648 | enqueue: | |
0cfdd8f9 UB |
649 | if (local_contact == SMC_FIRST_CONTACT) |
650 | mutex_unlock(&smc_create_lgr_pending); | |
a046d57d UB |
651 | lock_sock(&lsmc->sk); |
652 | if (lsmc->sk.sk_state == SMC_LISTEN) { | |
653 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
654 | } else { /* no longer listening */ | |
655 | smc_close_non_accepted(newsmcsk); | |
656 | } | |
657 | release_sock(&lsmc->sk); | |
658 | ||
659 | /* Wake up accept */ | |
660 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
661 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
662 | return; | |
663 | ||
664 | decline_rdma: | |
665 | /* RDMA setup failed, switch back to TCP */ | |
0cfdd8f9 | 666 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
667 | new_smc->use_fallback = true; |
668 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
669 | rc = smc_clc_send_decline(new_smc, reason_code, 0); | |
670 | if (rc < sizeof(struct smc_clc_msg_decline)) | |
671 | goto out_err; | |
672 | } | |
673 | goto out_connected; | |
674 | ||
675 | out_err: | |
676 | newsmcsk->sk_state = SMC_CLOSED; | |
677 | goto enqueue; /* queue new sock with sk_err set */ | |
678 | } | |
679 | ||
680 | static void smc_tcp_listen_work(struct work_struct *work) | |
681 | { | |
682 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
683 | tcp_listen_work); | |
684 | struct smc_sock *new_smc; | |
685 | int rc = 0; | |
686 | ||
687 | lock_sock(&lsmc->sk); | |
688 | while (lsmc->sk.sk_state == SMC_LISTEN) { | |
689 | rc = smc_clcsock_accept(lsmc, &new_smc); | |
690 | if (rc) | |
691 | goto out; | |
692 | if (!new_smc) | |
693 | continue; | |
694 | ||
695 | new_smc->listen_smc = lsmc; | |
696 | new_smc->use_fallback = false; /* assume rdma capability first*/ | |
697 | sock_hold(&lsmc->sk); /* sock_put in smc_listen_work */ | |
698 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); | |
699 | smc_copy_sock_settings_to_smc(new_smc); | |
700 | schedule_work(&new_smc->smc_listen_work); | |
701 | } | |
702 | ||
703 | out: | |
704 | release_sock(&lsmc->sk); | |
705 | lsmc->sk.sk_data_ready(&lsmc->sk); /* no more listening, wake accept */ | |
706 | } | |
707 | ||
ac713874 UB |
708 | static int smc_listen(struct socket *sock, int backlog) |
709 | { | |
710 | struct sock *sk = sock->sk; | |
711 | struct smc_sock *smc; | |
712 | int rc; | |
713 | ||
714 | smc = smc_sk(sk); | |
715 | lock_sock(sk); | |
716 | ||
717 | rc = -EINVAL; | |
718 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
719 | goto out; | |
720 | ||
721 | rc = 0; | |
722 | if (sk->sk_state == SMC_LISTEN) { | |
723 | sk->sk_max_ack_backlog = backlog; | |
724 | goto out; | |
725 | } | |
726 | /* some socket options are handled in core, so we could not apply | |
727 | * them to the clc socket -- copy smc socket options to clc socket | |
728 | */ | |
729 | smc_copy_sock_settings_to_clc(smc); | |
730 | ||
731 | rc = kernel_listen(smc->clcsock, backlog); | |
732 | if (rc) | |
733 | goto out; | |
734 | sk->sk_max_ack_backlog = backlog; | |
735 | sk->sk_ack_backlog = 0; | |
736 | sk->sk_state = SMC_LISTEN; | |
a046d57d UB |
737 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
738 | schedule_work(&smc->tcp_listen_work); | |
ac713874 UB |
739 | |
740 | out: | |
741 | release_sock(sk); | |
742 | return rc; | |
743 | } | |
744 | ||
745 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
746 | int flags) | |
747 | { | |
a046d57d UB |
748 | struct sock *sk = sock->sk, *nsk; |
749 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 750 | struct smc_sock *lsmc; |
a046d57d UB |
751 | long timeo; |
752 | int rc = 0; | |
ac713874 UB |
753 | |
754 | lsmc = smc_sk(sk); | |
755 | lock_sock(sk); | |
756 | ||
757 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
758 | rc = -EINVAL; | |
759 | goto out; | |
760 | } | |
761 | ||
a046d57d UB |
762 | /* Wait for an incoming connection */ |
763 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
764 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
765 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
766 | set_current_state(TASK_INTERRUPTIBLE); | |
767 | if (!timeo) { | |
768 | rc = -EAGAIN; | |
769 | break; | |
770 | } | |
771 | release_sock(sk); | |
772 | timeo = schedule_timeout(timeo); | |
773 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
774 | sched_annotate_sleep(); | |
775 | lock_sock(sk); | |
776 | if (signal_pending(current)) { | |
777 | rc = sock_intr_errno(timeo); | |
778 | break; | |
779 | } | |
780 | } | |
781 | set_current_state(TASK_RUNNING); | |
782 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 783 | |
a046d57d UB |
784 | if (!rc) |
785 | rc = sock_error(nsk); | |
ac713874 UB |
786 | |
787 | out: | |
788 | release_sock(sk); | |
789 | return rc; | |
790 | } | |
791 | ||
792 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
793 | int *len, int peer) | |
794 | { | |
795 | struct smc_sock *smc; | |
796 | ||
797 | if (peer && (sock->sk->sk_state != SMC_ACTIVE)) | |
798 | return -ENOTCONN; | |
799 | ||
800 | smc = smc_sk(sock->sk); | |
801 | ||
802 | return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer); | |
803 | } | |
804 | ||
805 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
806 | { | |
807 | struct sock *sk = sock->sk; | |
808 | struct smc_sock *smc; | |
809 | int rc = -EPIPE; | |
810 | ||
811 | smc = smc_sk(sk); | |
812 | lock_sock(sk); | |
813 | if (sk->sk_state != SMC_ACTIVE) | |
814 | goto out; | |
815 | if (smc->use_fallback) | |
816 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
817 | else | |
818 | rc = sock_no_sendmsg(sock, msg, len); | |
819 | out: | |
820 | release_sock(sk); | |
821 | return rc; | |
822 | } | |
823 | ||
824 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
825 | int flags) | |
826 | { | |
827 | struct sock *sk = sock->sk; | |
828 | struct smc_sock *smc; | |
829 | int rc = -ENOTCONN; | |
830 | ||
831 | smc = smc_sk(sk); | |
832 | lock_sock(sk); | |
833 | if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) | |
834 | goto out; | |
835 | ||
836 | if (smc->use_fallback) | |
837 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); | |
838 | else | |
839 | rc = sock_no_recvmsg(sock, msg, len, flags); | |
840 | out: | |
841 | release_sock(sk); | |
842 | return rc; | |
843 | } | |
844 | ||
a046d57d UB |
845 | static unsigned int smc_accept_poll(struct sock *parent) |
846 | { | |
847 | struct smc_sock *isk; | |
848 | struct sock *sk; | |
849 | ||
850 | lock_sock(parent); | |
851 | list_for_each_entry(isk, &smc_sk(parent)->accept_q, accept_q) { | |
852 | sk = (struct sock *)isk; | |
853 | ||
854 | if (sk->sk_state == SMC_ACTIVE) { | |
855 | release_sock(parent); | |
856 | return POLLIN | POLLRDNORM; | |
857 | } | |
858 | } | |
859 | release_sock(parent); | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
ac713874 UB |
864 | static unsigned int smc_poll(struct file *file, struct socket *sock, |
865 | poll_table *wait) | |
866 | { | |
867 | struct sock *sk = sock->sk; | |
868 | unsigned int mask = 0; | |
869 | struct smc_sock *smc; | |
a046d57d | 870 | int rc; |
ac713874 UB |
871 | |
872 | smc = smc_sk(sock->sk); | |
a046d57d UB |
873 | if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { |
874 | /* delegate to CLC child sock */ | |
ac713874 UB |
875 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
876 | /* if non-blocking connect finished ... */ | |
877 | lock_sock(sk); | |
878 | if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) { | |
a046d57d UB |
879 | sk->sk_err = smc->clcsock->sk->sk_err; |
880 | if (sk->sk_err) { | |
881 | mask |= POLLERR; | |
882 | } else { | |
883 | rc = smc_connect_rdma(smc); | |
884 | if (rc < 0) | |
885 | mask |= POLLERR; | |
886 | else | |
887 | /* success cases including fallback */ | |
888 | mask |= POLLOUT | POLLWRNORM; | |
889 | } | |
ac713874 UB |
890 | } |
891 | release_sock(sk); | |
892 | } else { | |
a046d57d UB |
893 | sock_poll_wait(file, sk_sleep(sk), wait); |
894 | if (sk->sk_state == SMC_LISTEN) | |
895 | /* woken up by sk_data_ready in smc_listen_work() */ | |
896 | mask |= smc_accept_poll(sk); | |
897 | if (sk->sk_err) | |
898 | mask |= POLLERR; | |
899 | /* for now - to be enhanced in follow-on patch */ | |
ac713874 UB |
900 | } |
901 | ||
902 | return mask; | |
903 | } | |
904 | ||
905 | static int smc_shutdown(struct socket *sock, int how) | |
906 | { | |
907 | struct sock *sk = sock->sk; | |
908 | struct smc_sock *smc; | |
909 | int rc = -EINVAL; | |
910 | ||
911 | smc = smc_sk(sk); | |
912 | ||
913 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
914 | goto out_err; | |
915 | ||
916 | lock_sock(sk); | |
917 | ||
918 | rc = -ENOTCONN; | |
919 | if (sk->sk_state == SMC_CLOSED) | |
920 | goto out; | |
921 | if (smc->use_fallback) { | |
922 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
923 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
924 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
925 | sk->sk_state = SMC_CLOSED; | |
926 | } else { | |
927 | rc = sock_no_shutdown(sock, how); | |
928 | } | |
929 | ||
930 | out: | |
931 | release_sock(sk); | |
932 | ||
933 | out_err: | |
934 | return rc; | |
935 | } | |
936 | ||
937 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
938 | char __user *optval, unsigned int optlen) | |
939 | { | |
940 | struct sock *sk = sock->sk; | |
941 | struct smc_sock *smc; | |
942 | ||
943 | smc = smc_sk(sk); | |
944 | ||
945 | /* generic setsockopts reaching us here always apply to the | |
946 | * CLC socket | |
947 | */ | |
948 | return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, | |
949 | optval, optlen); | |
950 | } | |
951 | ||
952 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
953 | char __user *optval, int __user *optlen) | |
954 | { | |
955 | struct smc_sock *smc; | |
956 | ||
957 | smc = smc_sk(sock->sk); | |
958 | /* socket options apply to the CLC socket */ | |
959 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
960 | optval, optlen); | |
961 | } | |
962 | ||
963 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
964 | unsigned long arg) | |
965 | { | |
966 | struct smc_sock *smc; | |
967 | ||
968 | smc = smc_sk(sock->sk); | |
969 | if (smc->use_fallback) | |
970 | return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); | |
971 | else | |
972 | return sock_no_ioctl(sock, cmd, arg); | |
973 | } | |
974 | ||
975 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
976 | int offset, size_t size, int flags) | |
977 | { | |
978 | struct sock *sk = sock->sk; | |
979 | struct smc_sock *smc; | |
980 | int rc = -EPIPE; | |
981 | ||
982 | smc = smc_sk(sk); | |
983 | lock_sock(sk); | |
984 | if (sk->sk_state != SMC_ACTIVE) | |
985 | goto out; | |
986 | if (smc->use_fallback) | |
987 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
988 | size, flags); | |
989 | else | |
990 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
991 | ||
992 | out: | |
993 | release_sock(sk); | |
994 | return rc; | |
995 | } | |
996 | ||
997 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, | |
998 | struct pipe_inode_info *pipe, size_t len, | |
999 | unsigned int flags) | |
1000 | { | |
1001 | struct sock *sk = sock->sk; | |
1002 | struct smc_sock *smc; | |
1003 | int rc = -ENOTCONN; | |
1004 | ||
1005 | smc = smc_sk(sk); | |
1006 | lock_sock(sk); | |
1007 | if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED)) | |
1008 | goto out; | |
1009 | if (smc->use_fallback) { | |
1010 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
1011 | pipe, len, flags); | |
1012 | } else { | |
1013 | rc = -EOPNOTSUPP; | |
1014 | } | |
1015 | out: | |
1016 | release_sock(sk); | |
1017 | return rc; | |
1018 | } | |
1019 | ||
1020 | /* must look like tcp */ | |
1021 | static const struct proto_ops smc_sock_ops = { | |
1022 | .family = PF_SMC, | |
1023 | .owner = THIS_MODULE, | |
1024 | .release = smc_release, | |
1025 | .bind = smc_bind, | |
1026 | .connect = smc_connect, | |
1027 | .socketpair = sock_no_socketpair, | |
1028 | .accept = smc_accept, | |
1029 | .getname = smc_getname, | |
1030 | .poll = smc_poll, | |
1031 | .ioctl = smc_ioctl, | |
1032 | .listen = smc_listen, | |
1033 | .shutdown = smc_shutdown, | |
1034 | .setsockopt = smc_setsockopt, | |
1035 | .getsockopt = smc_getsockopt, | |
1036 | .sendmsg = smc_sendmsg, | |
1037 | .recvmsg = smc_recvmsg, | |
1038 | .mmap = sock_no_mmap, | |
1039 | .sendpage = smc_sendpage, | |
1040 | .splice_read = smc_splice_read, | |
1041 | }; | |
1042 | ||
1043 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1044 | int kern) | |
1045 | { | |
1046 | struct smc_sock *smc; | |
1047 | struct sock *sk; | |
1048 | int rc; | |
1049 | ||
1050 | rc = -ESOCKTNOSUPPORT; | |
1051 | if (sock->type != SOCK_STREAM) | |
1052 | goto out; | |
1053 | ||
1054 | rc = -EPROTONOSUPPORT; | |
1055 | if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP)) | |
1056 | goto out; | |
1057 | ||
1058 | rc = -ENOBUFS; | |
1059 | sock->ops = &smc_sock_ops; | |
1060 | sk = smc_sock_alloc(net, sock); | |
1061 | if (!sk) | |
1062 | goto out; | |
1063 | ||
1064 | /* create internal TCP socket for CLC handshake and fallback */ | |
1065 | smc = smc_sk(sk); | |
a046d57d | 1066 | smc->use_fallback = false; /* assume rdma capability first */ |
ac713874 UB |
1067 | rc = sock_create_kern(net, PF_INET, SOCK_STREAM, |
1068 | IPPROTO_TCP, &smc->clcsock); | |
1069 | if (rc) | |
1070 | sk_common_release(sk); | |
cd6851f3 UB |
1071 | smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
1072 | smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); | |
ac713874 UB |
1073 | |
1074 | out: | |
1075 | return rc; | |
1076 | } | |
1077 | ||
1078 | static const struct net_proto_family smc_sock_family_ops = { | |
1079 | .family = PF_SMC, | |
1080 | .owner = THIS_MODULE, | |
1081 | .create = smc_create, | |
1082 | }; | |
1083 | ||
1084 | static int __init smc_init(void) | |
1085 | { | |
1086 | int rc; | |
1087 | ||
6812baab TR |
1088 | rc = smc_pnet_init(); |
1089 | if (rc) | |
1090 | return rc; | |
1091 | ||
ac713874 UB |
1092 | rc = proto_register(&smc_proto, 1); |
1093 | if (rc) { | |
1094 | pr_err("%s: proto_register fails with %d\n", __func__, rc); | |
6812baab | 1095 | goto out_pnet; |
ac713874 UB |
1096 | } |
1097 | ||
1098 | rc = sock_register(&smc_sock_family_ops); | |
1099 | if (rc) { | |
1100 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
1101 | goto out_proto; | |
1102 | } | |
1103 | ||
a4cf0443 UB |
1104 | rc = smc_ib_register_client(); |
1105 | if (rc) { | |
1106 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
1107 | goto out_sock; | |
1108 | } | |
1109 | ||
ac713874 UB |
1110 | return 0; |
1111 | ||
a4cf0443 UB |
1112 | out_sock: |
1113 | sock_unregister(PF_SMC); | |
ac713874 UB |
1114 | out_proto: |
1115 | proto_unregister(&smc_proto); | |
6812baab TR |
1116 | out_pnet: |
1117 | smc_pnet_exit(); | |
ac713874 UB |
1118 | return rc; |
1119 | } | |
1120 | ||
1121 | static void __exit smc_exit(void) | |
1122 | { | |
0cfdd8f9 UB |
1123 | struct smc_link_group *lgr, *lg; |
1124 | LIST_HEAD(lgr_freeing_list); | |
1125 | ||
1126 | spin_lock_bh(&smc_lgr_list.lock); | |
1127 | if (!list_empty(&smc_lgr_list.list)) | |
1128 | list_splice_init(&smc_lgr_list.list, &lgr_freeing_list); | |
1129 | spin_unlock_bh(&smc_lgr_list.lock); | |
1130 | list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) { | |
1131 | list_del_init(&lgr->list); | |
1132 | smc_lgr_free(lgr); /* free link group */ | |
1133 | } | |
a4cf0443 | 1134 | smc_ib_unregister_client(); |
ac713874 UB |
1135 | sock_unregister(PF_SMC); |
1136 | proto_unregister(&smc_proto); | |
6812baab | 1137 | smc_pnet_exit(); |
ac713874 UB |
1138 | } |
1139 | ||
1140 | module_init(smc_init); | |
1141 | module_exit(smc_exit); | |
1142 | ||
1143 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
1144 | MODULE_DESCRIPTION("smc socket address family"); | |
1145 | MODULE_LICENSE("GPL"); | |
1146 | MODULE_ALIAS_NETPROTO(PF_SMC); |