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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 | 9 | * Initial restrictions: |
a046d57d UB |
10 | * - support for alternate links postponed |
11 | * - partial support for non-blocking sockets only | |
12 | * - support for urgent data postponed | |
13 | * | |
aaa4d33f | 14 | * Copyright IBM Corp. 2016, 2018 |
ac713874 UB |
15 | * |
16 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
17 | * based on prototype from Frank Blaschka | |
18 | */ | |
19 | ||
20 | #define KMSG_COMPONENT "smc" | |
21 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/socket.h> | |
a046d57d | 25 | #include <linux/workqueue.h> |
5f08318f | 26 | #include <linux/in.h> |
c3edc401 IM |
27 | #include <linux/sched/signal.h> |
28 | ||
ac713874 | 29 | #include <net/sock.h> |
a046d57d | 30 | #include <net/tcp.h> |
f16a7dd5 | 31 | #include <net/smc.h> |
9b67e26f | 32 | #include <asm/ioctls.h> |
ac713874 UB |
33 | |
34 | #include "smc.h" | |
a046d57d | 35 | #include "smc_clc.h" |
9bf9abea | 36 | #include "smc_llc.h" |
5f08318f | 37 | #include "smc_cdc.h" |
0cfdd8f9 | 38 | #include "smc_core.h" |
a4cf0443 | 39 | #include "smc_ib.h" |
6812baab | 40 | #include "smc_pnet.h" |
e6727f39 | 41 | #include "smc_tx.h" |
952310cc | 42 | #include "smc_rx.h" |
b38d7324 | 43 | #include "smc_close.h" |
ac713874 | 44 | |
0cfdd8f9 UB |
45 | static DEFINE_MUTEX(smc_create_lgr_pending); /* serialize link group |
46 | * creation | |
47 | */ | |
48 | ||
a046d57d UB |
49 | static void smc_tcp_listen_work(struct work_struct *); |
50 | ||
ac713874 UB |
51 | static void smc_set_keepalive(struct sock *sk, int val) |
52 | { | |
53 | struct smc_sock *smc = smc_sk(sk); | |
54 | ||
55 | smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val); | |
56 | } | |
57 | ||
f16a7dd5 UB |
58 | static struct smc_hashinfo smc_v4_hashinfo = { |
59 | .lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock), | |
60 | }; | |
61 | ||
aaa4d33f KG |
62 | static struct smc_hashinfo smc_v6_hashinfo = { |
63 | .lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock), | |
64 | }; | |
65 | ||
f16a7dd5 UB |
66 | int smc_hash_sk(struct sock *sk) |
67 | { | |
68 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
69 | struct hlist_head *head; | |
70 | ||
71 | head = &h->ht; | |
72 | ||
73 | write_lock_bh(&h->lock); | |
74 | sk_add_node(sk, head); | |
75 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); | |
76 | write_unlock_bh(&h->lock); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | EXPORT_SYMBOL_GPL(smc_hash_sk); | |
81 | ||
82 | void smc_unhash_sk(struct sock *sk) | |
83 | { | |
84 | struct smc_hashinfo *h = sk->sk_prot->h.smc_hash; | |
85 | ||
86 | write_lock_bh(&h->lock); | |
87 | if (sk_del_node_init(sk)) | |
88 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); | |
89 | write_unlock_bh(&h->lock); | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(smc_unhash_sk); | |
92 | ||
93 | struct proto smc_proto = { | |
ac713874 UB |
94 | .name = "SMC", |
95 | .owner = THIS_MODULE, | |
96 | .keepalive = smc_set_keepalive, | |
f16a7dd5 UB |
97 | .hash = smc_hash_sk, |
98 | .unhash = smc_unhash_sk, | |
ac713874 | 99 | .obj_size = sizeof(struct smc_sock), |
f16a7dd5 | 100 | .h.smc_hash = &smc_v4_hashinfo, |
5f0d5a3a | 101 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
ac713874 | 102 | }; |
f16a7dd5 | 103 | EXPORT_SYMBOL_GPL(smc_proto); |
ac713874 | 104 | |
aaa4d33f KG |
105 | struct proto smc_proto6 = { |
106 | .name = "SMC6", | |
107 | .owner = THIS_MODULE, | |
108 | .keepalive = smc_set_keepalive, | |
109 | .hash = smc_hash_sk, | |
110 | .unhash = smc_unhash_sk, | |
111 | .obj_size = sizeof(struct smc_sock), | |
112 | .h.smc_hash = &smc_v6_hashinfo, | |
113 | .slab_flags = SLAB_TYPESAFE_BY_RCU, | |
114 | }; | |
115 | EXPORT_SYMBOL_GPL(smc_proto6); | |
116 | ||
ac713874 UB |
117 | static int smc_release(struct socket *sock) |
118 | { | |
119 | struct sock *sk = sock->sk; | |
120 | struct smc_sock *smc; | |
b38d7324 | 121 | int rc = 0; |
ac713874 UB |
122 | |
123 | if (!sk) | |
124 | goto out; | |
125 | ||
126 | smc = smc_sk(sk); | |
b38d7324 UB |
127 | if (sk->sk_state == SMC_LISTEN) |
128 | /* smc_close_non_accepted() is called and acquires | |
129 | * sock lock for child sockets again | |
130 | */ | |
131 | lock_sock_nested(sk, SINGLE_DEPTH_NESTING); | |
132 | else | |
133 | lock_sock(sk); | |
ac713874 | 134 | |
51f1de79 | 135 | if (!smc->use_fallback) { |
b38d7324 UB |
136 | rc = smc_close_active(smc); |
137 | sock_set_flag(sk, SOCK_DEAD); | |
138 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
139 | } | |
ac713874 UB |
140 | if (smc->clcsock) { |
141 | sock_release(smc->clcsock); | |
142 | smc->clcsock = NULL; | |
143 | } | |
51f1de79 UB |
144 | if (smc->use_fallback) { |
145 | sock_put(sk); /* passive closing */ | |
146 | sk->sk_state = SMC_CLOSED; | |
147 | sk->sk_state_change(sk); | |
148 | } | |
ac713874 UB |
149 | |
150 | /* detach socket */ | |
151 | sock_orphan(sk); | |
152 | sock->sk = NULL; | |
51f1de79 | 153 | if (!smc->use_fallback && sk->sk_state == SMC_CLOSED) |
b38d7324 | 154 | smc_conn_free(&smc->conn); |
ac713874 UB |
155 | release_sock(sk); |
156 | ||
51f1de79 UB |
157 | sk->sk_prot->unhash(sk); |
158 | sock_put(sk); /* final sock_put */ | |
ac713874 | 159 | out: |
b38d7324 | 160 | return rc; |
ac713874 UB |
161 | } |
162 | ||
163 | static void smc_destruct(struct sock *sk) | |
164 | { | |
165 | if (sk->sk_state != SMC_CLOSED) | |
166 | return; | |
167 | if (!sock_flag(sk, SOCK_DEAD)) | |
168 | return; | |
169 | ||
170 | sk_refcnt_debug_dec(sk); | |
171 | } | |
172 | ||
aaa4d33f KG |
173 | static struct sock *smc_sock_alloc(struct net *net, struct socket *sock, |
174 | int protocol) | |
ac713874 UB |
175 | { |
176 | struct smc_sock *smc; | |
aaa4d33f | 177 | struct proto *prot; |
ac713874 UB |
178 | struct sock *sk; |
179 | ||
aaa4d33f KG |
180 | prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto; |
181 | sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0); | |
ac713874 UB |
182 | if (!sk) |
183 | return NULL; | |
184 | ||
185 | sock_init_data(sock, sk); /* sets sk_refcnt to 1 */ | |
186 | sk->sk_state = SMC_INIT; | |
187 | sk->sk_destruct = smc_destruct; | |
aaa4d33f | 188 | sk->sk_protocol = protocol; |
ac713874 | 189 | smc = smc_sk(sk); |
a046d57d | 190 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
be7f3e59 | 191 | INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work); |
a046d57d UB |
192 | INIT_LIST_HEAD(&smc->accept_q); |
193 | spin_lock_init(&smc->accept_q_lock); | |
be7f3e59 | 194 | spin_lock_init(&smc->conn.send_lock); |
f16a7dd5 | 195 | sk->sk_prot->hash(sk); |
a046d57d | 196 | sk_refcnt_debug_inc(sk); |
ac713874 UB |
197 | |
198 | return sk; | |
199 | } | |
200 | ||
201 | static int smc_bind(struct socket *sock, struct sockaddr *uaddr, | |
202 | int addr_len) | |
203 | { | |
204 | struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; | |
205 | struct sock *sk = sock->sk; | |
206 | struct smc_sock *smc; | |
207 | int rc; | |
208 | ||
209 | smc = smc_sk(sk); | |
210 | ||
211 | /* replicate tests from inet_bind(), to be safe wrt. future changes */ | |
212 | rc = -EINVAL; | |
213 | if (addr_len < sizeof(struct sockaddr_in)) | |
214 | goto out; | |
215 | ||
216 | rc = -EAFNOSUPPORT; | |
aaa4d33f KG |
217 | if (addr->sin_family != AF_INET && |
218 | addr->sin_family != AF_INET6 && | |
219 | addr->sin_family != AF_UNSPEC) | |
220 | goto out; | |
ac713874 | 221 | /* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */ |
aaa4d33f KG |
222 | if (addr->sin_family == AF_UNSPEC && |
223 | addr->sin_addr.s_addr != htonl(INADDR_ANY)) | |
ac713874 UB |
224 | goto out; |
225 | ||
226 | lock_sock(sk); | |
227 | ||
228 | /* Check if socket is already active */ | |
229 | rc = -EINVAL; | |
230 | if (sk->sk_state != SMC_INIT) | |
231 | goto out_rel; | |
232 | ||
233 | smc->clcsock->sk->sk_reuse = sk->sk_reuse; | |
234 | rc = kernel_bind(smc->clcsock, uaddr, addr_len); | |
235 | ||
236 | out_rel: | |
237 | release_sock(sk); | |
238 | out: | |
239 | return rc; | |
240 | } | |
241 | ||
242 | static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk, | |
243 | unsigned long mask) | |
244 | { | |
245 | /* options we don't get control via setsockopt for */ | |
246 | nsk->sk_type = osk->sk_type; | |
247 | nsk->sk_sndbuf = osk->sk_sndbuf; | |
248 | nsk->sk_rcvbuf = osk->sk_rcvbuf; | |
249 | nsk->sk_sndtimeo = osk->sk_sndtimeo; | |
250 | nsk->sk_rcvtimeo = osk->sk_rcvtimeo; | |
251 | nsk->sk_mark = osk->sk_mark; | |
252 | nsk->sk_priority = osk->sk_priority; | |
253 | nsk->sk_rcvlowat = osk->sk_rcvlowat; | |
254 | nsk->sk_bound_dev_if = osk->sk_bound_dev_if; | |
255 | nsk->sk_err = osk->sk_err; | |
256 | ||
257 | nsk->sk_flags &= ~mask; | |
258 | nsk->sk_flags |= osk->sk_flags & mask; | |
259 | } | |
260 | ||
261 | #define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \ | |
262 | (1UL << SOCK_KEEPOPEN) | \ | |
263 | (1UL << SOCK_LINGER) | \ | |
264 | (1UL << SOCK_BROADCAST) | \ | |
265 | (1UL << SOCK_TIMESTAMP) | \ | |
266 | (1UL << SOCK_DBG) | \ | |
267 | (1UL << SOCK_RCVTSTAMP) | \ | |
268 | (1UL << SOCK_RCVTSTAMPNS) | \ | |
269 | (1UL << SOCK_LOCALROUTE) | \ | |
270 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \ | |
271 | (1UL << SOCK_RXQ_OVFL) | \ | |
272 | (1UL << SOCK_WIFI_STATUS) | \ | |
273 | (1UL << SOCK_NOFCS) | \ | |
274 | (1UL << SOCK_FILTER_LOCKED)) | |
275 | /* copy only relevant settings and flags of SOL_SOCKET level from smc to | |
276 | * clc socket (since smc is not called for these options from net/core) | |
277 | */ | |
278 | static void smc_copy_sock_settings_to_clc(struct smc_sock *smc) | |
279 | { | |
280 | smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC); | |
281 | } | |
282 | ||
283 | #define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \ | |
284 | (1UL << SOCK_KEEPOPEN) | \ | |
285 | (1UL << SOCK_LINGER) | \ | |
286 | (1UL << SOCK_DBG)) | |
287 | /* copy only settings and flags relevant for smc from clc to smc socket */ | |
288 | static void smc_copy_sock_settings_to_smc(struct smc_sock *smc) | |
289 | { | |
290 | smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC); | |
291 | } | |
292 | ||
44aa81ce KG |
293 | /* register a new rmb, optionally send confirm_rkey msg to register with peer */ |
294 | static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc, | |
295 | bool conf_rkey) | |
e63a5f8c KG |
296 | { |
297 | /* register memory region for new rmb */ | |
a6920d1d KG |
298 | if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) { |
299 | rmb_desc->regerr = 1; | |
e63a5f8c | 300 | return -EFAULT; |
a6920d1d | 301 | } |
44aa81ce KG |
302 | if (!conf_rkey) |
303 | return 0; | |
304 | /* exchange confirm_rkey msg with peer */ | |
305 | if (smc_llc_do_confirm_rkey(link, rmb_desc)) { | |
306 | rmb_desc->regerr = 1; | |
307 | return -EFAULT; | |
308 | } | |
e63a5f8c KG |
309 | return 0; |
310 | } | |
311 | ||
0f627126 | 312 | static int smc_clnt_conf_first_link(struct smc_sock *smc) |
9bf9abea | 313 | { |
877ae5be | 314 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
315 | struct smc_link_group *lgr = smc->conn.lgr; |
316 | struct smc_link *link; | |
317 | int rest; | |
318 | int rc; | |
319 | ||
320 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
321 | /* receive CONFIRM LINK request from server over RoCE fabric */ | |
322 | rest = wait_for_completion_interruptible_timeout( | |
323 | &link->llc_confirm, | |
324 | SMC_LLC_WAIT_FIRST_TIME); | |
325 | if (rest <= 0) { | |
326 | struct smc_clc_msg_decline dclc; | |
327 | ||
328 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
329 | SMC_CLC_DECLINE); | |
330 | return rc; | |
331 | } | |
332 | ||
75d320d6 KG |
333 | if (link->llc_confirm_rc) |
334 | return SMC_CLC_DECL_RMBE_EC; | |
335 | ||
9bf9abea UB |
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 | 341 | |
44aa81ce | 342 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
652a1e41 UB |
343 | return SMC_CLC_DECL_INTERR; |
344 | ||
9bf9abea UB |
345 | /* send CONFIRM LINK response over RoCE fabric */ |
346 | rc = smc_llc_send_confirm_link(link, | |
347 | link->smcibdev->mac[link->ibport - 1], | |
0f627126 SR |
348 | &link->smcibdev->gid[link->ibport - 1], |
349 | SMC_LLC_RESP); | |
9bf9abea UB |
350 | if (rc < 0) |
351 | return SMC_CLC_DECL_TCL; | |
352 | ||
52bedf37 KG |
353 | /* receive ADD LINK request from server over RoCE fabric */ |
354 | rest = wait_for_completion_interruptible_timeout(&link->llc_add, | |
355 | SMC_LLC_WAIT_TIME); | |
356 | if (rest <= 0) { | |
357 | struct smc_clc_msg_decline dclc; | |
358 | ||
359 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
360 | SMC_CLC_DECLINE); | |
361 | return rc; | |
362 | } | |
363 | ||
364 | /* send add link reject message, only one link supported for now */ | |
365 | rc = smc_llc_send_add_link(link, | |
366 | link->smcibdev->mac[link->ibport - 1], | |
367 | &link->smcibdev->gid[link->ibport - 1], | |
368 | SMC_LLC_RESP); | |
369 | if (rc < 0) | |
370 | return SMC_CLC_DECL_TCL; | |
371 | ||
877ae5be | 372 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 373 | |
75d320d6 | 374 | return 0; |
9bf9abea UB |
375 | } |
376 | ||
0cfdd8f9 UB |
377 | static void smc_conn_save_peer_info(struct smc_sock *smc, |
378 | struct smc_clc_msg_accept_confirm *clc) | |
379 | { | |
92a138e3 | 380 | smc->conn.peer_rmbe_idx = clc->rmbe_idx; |
5f08318f | 381 | smc->conn.local_tx_ctrl.token = ntohl(clc->rmbe_alert_token); |
cd6851f3 UB |
382 | smc->conn.peer_rmbe_size = smc_uncompress_bufsize(clc->rmbe_size); |
383 | atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size); | |
0cfdd8f9 UB |
384 | } |
385 | ||
386 | static void smc_link_save_peer_info(struct smc_link *link, | |
387 | struct smc_clc_msg_accept_confirm *clc) | |
388 | { | |
389 | link->peer_qpn = ntoh24(clc->qpn); | |
390 | memcpy(link->peer_gid, clc->lcl.gid, SMC_GID_SIZE); | |
391 | memcpy(link->peer_mac, clc->lcl.mac, sizeof(link->peer_mac)); | |
392 | link->peer_psn = ntoh24(clc->psn); | |
393 | link->peer_mtu = clc->qp_mtu; | |
394 | } | |
395 | ||
a046d57d UB |
396 | /* setup for RDMA connection of client */ |
397 | static int smc_connect_rdma(struct smc_sock *smc) | |
398 | { | |
399 | struct smc_clc_msg_accept_confirm aclc; | |
0cfdd8f9 | 400 | int local_contact = SMC_FIRST_CONTACT; |
a046d57d | 401 | struct smc_ib_device *smcibdev; |
0cfdd8f9 UB |
402 | struct smc_link *link; |
403 | u8 srv_first_contact; | |
a046d57d UB |
404 | int reason_code = 0; |
405 | int rc = 0; | |
406 | u8 ibport; | |
407 | ||
51f1de79 UB |
408 | sock_hold(&smc->sk); /* sock put in passive closing */ |
409 | ||
ee9dfbef UB |
410 | if (smc->use_fallback) |
411 | goto out_connected; | |
412 | ||
c5c1cc9c UB |
413 | if (!tcp_sk(smc->clcsock->sk)->syn_smc) { |
414 | /* peer has not signalled SMC-capability */ | |
415 | smc->use_fallback = true; | |
416 | goto out_connected; | |
417 | } | |
418 | ||
a046d57d UB |
419 | /* IPSec connections opt out of SMC-R optimizations */ |
420 | if (using_ipsec(smc)) { | |
421 | reason_code = SMC_CLC_DECL_IPSEC; | |
422 | goto decline_rdma; | |
423 | } | |
424 | ||
425 | /* PNET table look up: search active ib_device and port | |
426 | * within same PNETID that also contains the ethernet device | |
427 | * used for the internal TCP socket | |
428 | */ | |
429 | smc_pnet_find_roce_resource(smc->clcsock->sk, &smcibdev, &ibport); | |
430 | if (!smcibdev) { | |
431 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
432 | goto decline_rdma; | |
433 | } | |
434 | ||
435 | /* do inband token exchange */ | |
436 | reason_code = smc_clc_send_proposal(smc, smcibdev, ibport); | |
437 | if (reason_code < 0) { | |
438 | rc = reason_code; | |
439 | goto out_err; | |
440 | } | |
441 | if (reason_code > 0) /* configuration error */ | |
442 | goto decline_rdma; | |
443 | /* receive SMC Accept CLC message */ | |
444 | reason_code = smc_clc_wait_msg(smc, &aclc, sizeof(aclc), | |
445 | SMC_CLC_ACCEPT); | |
446 | if (reason_code < 0) { | |
447 | rc = reason_code; | |
448 | goto out_err; | |
449 | } | |
450 | if (reason_code > 0) | |
451 | goto decline_rdma; | |
452 | ||
0cfdd8f9 UB |
453 | srv_first_contact = aclc.hdr.flag; |
454 | mutex_lock(&smc_create_lgr_pending); | |
be6d467b KG |
455 | local_contact = smc_conn_create(smc, smcibdev, ibport, &aclc.lcl, |
456 | srv_first_contact); | |
0cfdd8f9 UB |
457 | if (local_contact < 0) { |
458 | rc = local_contact; | |
459 | if (rc == -ENOMEM) | |
460 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
461 | else if (rc == -ENOLINK) | |
462 | reason_code = SMC_CLC_DECL_SYNCERR; /* synchr. error */ | |
1401ea04 KG |
463 | else |
464 | reason_code = SMC_CLC_DECL_INTERR; /* other error */ | |
0cfdd8f9 UB |
465 | goto decline_rdma_unlock; |
466 | } | |
467 | link = &smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 468 | |
0cfdd8f9 | 469 | smc_conn_save_peer_info(smc, &aclc); |
cd6851f3 | 470 | |
3e034725 UB |
471 | /* create send buffer and rmb */ |
472 | rc = smc_buf_create(smc); | |
cd6851f3 UB |
473 | if (rc) { |
474 | reason_code = SMC_CLC_DECL_MEM; | |
475 | goto decline_rdma_unlock; | |
476 | } | |
477 | ||
0cfdd8f9 UB |
478 | if (local_contact == SMC_FIRST_CONTACT) |
479 | smc_link_save_peer_info(link, &aclc); | |
bd4ad577 UB |
480 | |
481 | rc = smc_rmb_rtoken_handling(&smc->conn, &aclc); | |
482 | if (rc) { | |
483 | reason_code = SMC_CLC_DECL_INTERR; | |
484 | goto decline_rdma_unlock; | |
485 | } | |
486 | ||
46c28dbd UB |
487 | smc_close_init(smc); |
488 | smc_rx_init(smc); | |
489 | ||
bd4ad577 UB |
490 | if (local_contact == SMC_FIRST_CONTACT) { |
491 | rc = smc_ib_ready_link(link); | |
492 | if (rc) { | |
493 | reason_code = SMC_CLC_DECL_INTERR; | |
494 | goto decline_rdma_unlock; | |
495 | } | |
652a1e41 | 496 | } else { |
e63a5f8c | 497 | if (!smc->conn.rmb_desc->reused) { |
44aa81ce | 498 | if (smc_reg_rmb(link, smc->conn.rmb_desc, true)) { |
652a1e41 UB |
499 | reason_code = SMC_CLC_DECL_INTERR; |
500 | goto decline_rdma_unlock; | |
501 | } | |
502 | } | |
bd4ad577 | 503 | } |
10428dd8 | 504 | smc_rmb_sync_sg_for_device(&smc->conn); |
a046d57d UB |
505 | |
506 | rc = smc_clc_send_confirm(smc); | |
507 | if (rc) | |
0cfdd8f9 | 508 | goto out_err_unlock; |
a046d57d | 509 | |
9bf9abea UB |
510 | if (local_contact == SMC_FIRST_CONTACT) { |
511 | /* QP confirmation over RoCE fabric */ | |
0f627126 | 512 | reason_code = smc_clnt_conf_first_link(smc); |
9bf9abea UB |
513 | if (reason_code < 0) { |
514 | rc = reason_code; | |
515 | goto out_err_unlock; | |
516 | } | |
517 | if (reason_code > 0) | |
518 | goto decline_rdma_unlock; | |
519 | } | |
a046d57d | 520 | |
0cfdd8f9 | 521 | mutex_unlock(&smc_create_lgr_pending); |
e6727f39 UB |
522 | smc_tx_init(smc); |
523 | ||
a046d57d UB |
524 | out_connected: |
525 | smc_copy_sock_settings_to_clc(smc); | |
b38d7324 UB |
526 | if (smc->sk.sk_state == SMC_INIT) |
527 | smc->sk.sk_state = SMC_ACTIVE; | |
a046d57d | 528 | |
0cfdd8f9 | 529 | return rc ? rc : local_contact; |
a046d57d | 530 | |
0cfdd8f9 | 531 | decline_rdma_unlock: |
610db66f UB |
532 | if (local_contact == SMC_FIRST_CONTACT) |
533 | smc_lgr_forget(smc->conn.lgr); | |
0cfdd8f9 UB |
534 | mutex_unlock(&smc_create_lgr_pending); |
535 | smc_conn_free(&smc->conn); | |
a046d57d UB |
536 | decline_rdma: |
537 | /* RDMA setup failed, switch back to TCP */ | |
538 | smc->use_fallback = true; | |
539 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
bfbedfd3 | 540 | rc = smc_clc_send_decline(smc, reason_code); |
0c9f1515 | 541 | if (rc < 0) |
a046d57d UB |
542 | goto out_err; |
543 | } | |
544 | goto out_connected; | |
545 | ||
0cfdd8f9 | 546 | out_err_unlock: |
610db66f UB |
547 | if (local_contact == SMC_FIRST_CONTACT) |
548 | smc_lgr_forget(smc->conn.lgr); | |
0cfdd8f9 UB |
549 | mutex_unlock(&smc_create_lgr_pending); |
550 | smc_conn_free(&smc->conn); | |
a046d57d | 551 | out_err: |
51f1de79 UB |
552 | if (smc->sk.sk_state == SMC_INIT) |
553 | sock_put(&smc->sk); /* passive closing */ | |
a046d57d UB |
554 | return rc; |
555 | } | |
556 | ||
ac713874 UB |
557 | static int smc_connect(struct socket *sock, struct sockaddr *addr, |
558 | int alen, int flags) | |
559 | { | |
560 | struct sock *sk = sock->sk; | |
561 | struct smc_sock *smc; | |
562 | int rc = -EINVAL; | |
563 | ||
564 | smc = smc_sk(sk); | |
565 | ||
566 | /* separate smc parameter checking to be safe */ | |
567 | if (alen < sizeof(addr->sa_family)) | |
568 | goto out_err; | |
aaa4d33f | 569 | if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6) |
ac713874 UB |
570 | goto out_err; |
571 | ||
572 | lock_sock(sk); | |
573 | switch (sk->sk_state) { | |
574 | default: | |
575 | goto out; | |
576 | case SMC_ACTIVE: | |
577 | rc = -EISCONN; | |
578 | goto out; | |
579 | case SMC_INIT: | |
580 | rc = 0; | |
581 | break; | |
582 | } | |
583 | ||
584 | smc_copy_sock_settings_to_clc(smc); | |
c5c1cc9c | 585 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; |
ac713874 UB |
586 | rc = kernel_connect(smc->clcsock, addr, alen, flags); |
587 | if (rc) | |
588 | goto out; | |
589 | ||
a046d57d UB |
590 | /* setup RDMA connection */ |
591 | rc = smc_connect_rdma(smc); | |
592 | if (rc < 0) | |
593 | goto out; | |
594 | else | |
595 | rc = 0; /* success cases including fallback */ | |
ac713874 UB |
596 | |
597 | out: | |
598 | release_sock(sk); | |
599 | out_err: | |
600 | return rc; | |
601 | } | |
602 | ||
603 | static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc) | |
604 | { | |
3163c507 UB |
605 | struct socket *new_clcsock = NULL; |
606 | struct sock *lsk = &lsmc->sk; | |
ac713874 UB |
607 | struct sock *new_sk; |
608 | int rc; | |
609 | ||
3163c507 | 610 | release_sock(lsk); |
aaa4d33f | 611 | new_sk = smc_sock_alloc(sock_net(lsk), NULL, lsk->sk_protocol); |
ac713874 UB |
612 | if (!new_sk) { |
613 | rc = -ENOMEM; | |
3163c507 | 614 | lsk->sk_err = ENOMEM; |
ac713874 | 615 | *new_smc = NULL; |
3163c507 | 616 | lock_sock(lsk); |
ac713874 UB |
617 | goto out; |
618 | } | |
619 | *new_smc = smc_sk(new_sk); | |
620 | ||
621 | rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0); | |
3163c507 | 622 | lock_sock(lsk); |
35a6b178 | 623 | if (rc < 0) |
3163c507 | 624 | lsk->sk_err = -rc; |
35a6b178 | 625 | if (rc < 0 || lsk->sk_state == SMC_CLOSED) { |
a046d57d UB |
626 | if (new_clcsock) |
627 | sock_release(new_clcsock); | |
628 | new_sk->sk_state = SMC_CLOSED; | |
629 | sock_set_flag(new_sk, SOCK_DEAD); | |
3163c507 | 630 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 631 | sock_put(new_sk); /* final */ |
ac713874 UB |
632 | *new_smc = NULL; |
633 | goto out; | |
634 | } | |
635 | ||
636 | (*new_smc)->clcsock = new_clcsock; | |
637 | out: | |
638 | return rc; | |
639 | } | |
640 | ||
a046d57d UB |
641 | /* add a just created sock to the accept queue of the listen sock as |
642 | * candidate for a following socket accept call from user space | |
643 | */ | |
644 | static void smc_accept_enqueue(struct sock *parent, struct sock *sk) | |
645 | { | |
646 | struct smc_sock *par = smc_sk(parent); | |
647 | ||
51f1de79 | 648 | sock_hold(sk); /* sock_put in smc_accept_unlink () */ |
a046d57d UB |
649 | spin_lock(&par->accept_q_lock); |
650 | list_add_tail(&smc_sk(sk)->accept_q, &par->accept_q); | |
651 | spin_unlock(&par->accept_q_lock); | |
652 | sk_acceptq_added(parent); | |
653 | } | |
654 | ||
655 | /* remove a socket from the accept queue of its parental listening socket */ | |
656 | static void smc_accept_unlink(struct sock *sk) | |
657 | { | |
658 | struct smc_sock *par = smc_sk(sk)->listen_smc; | |
659 | ||
660 | spin_lock(&par->accept_q_lock); | |
661 | list_del_init(&smc_sk(sk)->accept_q); | |
662 | spin_unlock(&par->accept_q_lock); | |
663 | sk_acceptq_removed(&smc_sk(sk)->listen_smc->sk); | |
51f1de79 | 664 | sock_put(sk); /* sock_hold in smc_accept_enqueue */ |
a046d57d UB |
665 | } |
666 | ||
667 | /* remove a sock from the accept queue to bind it to a new socket created | |
668 | * for a socket accept call from user space | |
669 | */ | |
b38d7324 UB |
670 | struct sock *smc_accept_dequeue(struct sock *parent, |
671 | struct socket *new_sock) | |
a046d57d UB |
672 | { |
673 | struct smc_sock *isk, *n; | |
674 | struct sock *new_sk; | |
675 | ||
676 | list_for_each_entry_safe(isk, n, &smc_sk(parent)->accept_q, accept_q) { | |
677 | new_sk = (struct sock *)isk; | |
678 | ||
679 | smc_accept_unlink(new_sk); | |
680 | if (new_sk->sk_state == SMC_CLOSED) { | |
127f4970 UB |
681 | if (isk->clcsock) { |
682 | sock_release(isk->clcsock); | |
683 | isk->clcsock = NULL; | |
684 | } | |
288c8390 | 685 | new_sk->sk_prot->unhash(new_sk); |
51f1de79 | 686 | sock_put(new_sk); /* final */ |
a046d57d UB |
687 | continue; |
688 | } | |
689 | if (new_sock) | |
690 | sock_graft(new_sk, new_sock); | |
691 | return new_sk; | |
692 | } | |
693 | return NULL; | |
694 | } | |
695 | ||
696 | /* clean up for a created but never accepted sock */ | |
b38d7324 | 697 | void smc_close_non_accepted(struct sock *sk) |
a046d57d UB |
698 | { |
699 | struct smc_sock *smc = smc_sk(sk); | |
700 | ||
b38d7324 UB |
701 | lock_sock(sk); |
702 | if (!sk->sk_lingertime) | |
703 | /* wait for peer closing */ | |
704 | sk->sk_lingertime = SMC_MAX_STREAM_WAIT_TIMEOUT; | |
51f1de79 | 705 | if (!smc->use_fallback) { |
b38d7324 | 706 | smc_close_active(smc); |
288c8390 UB |
707 | sock_set_flag(sk, SOCK_DEAD); |
708 | sk->sk_shutdown |= SHUTDOWN_MASK; | |
709 | } | |
a046d57d UB |
710 | if (smc->clcsock) { |
711 | struct socket *tcp; | |
712 | ||
713 | tcp = smc->clcsock; | |
714 | smc->clcsock = NULL; | |
715 | sock_release(tcp); | |
716 | } | |
b38d7324 | 717 | if (smc->use_fallback) { |
51f1de79 UB |
718 | sock_put(sk); /* passive closing */ |
719 | sk->sk_state = SMC_CLOSED; | |
720 | } else { | |
721 | if (sk->sk_state == SMC_CLOSED) | |
722 | smc_conn_free(&smc->conn); | |
b38d7324 UB |
723 | } |
724 | release_sock(sk); | |
51f1de79 UB |
725 | sk->sk_prot->unhash(sk); |
726 | sock_put(sk); /* final sock_put */ | |
a046d57d UB |
727 | } |
728 | ||
9bf9abea UB |
729 | static int smc_serv_conf_first_link(struct smc_sock *smc) |
730 | { | |
877ae5be | 731 | struct net *net = sock_net(smc->clcsock->sk); |
9bf9abea UB |
732 | struct smc_link_group *lgr = smc->conn.lgr; |
733 | struct smc_link *link; | |
734 | int rest; | |
735 | int rc; | |
736 | ||
737 | link = &lgr->lnk[SMC_SINGLE_LINK]; | |
652a1e41 | 738 | |
44aa81ce | 739 | if (smc_reg_rmb(link, smc->conn.rmb_desc, false)) |
652a1e41 UB |
740 | return SMC_CLC_DECL_INTERR; |
741 | ||
9bf9abea UB |
742 | /* send CONFIRM LINK request to client over the RoCE fabric */ |
743 | rc = smc_llc_send_confirm_link(link, | |
744 | link->smcibdev->mac[link->ibport - 1], | |
745 | &link->smcibdev->gid[link->ibport - 1], | |
746 | SMC_LLC_REQ); | |
747 | if (rc < 0) | |
748 | return SMC_CLC_DECL_TCL; | |
749 | ||
750 | /* receive CONFIRM LINK response from client over the RoCE fabric */ | |
751 | rest = wait_for_completion_interruptible_timeout( | |
752 | &link->llc_confirm_resp, | |
753 | SMC_LLC_WAIT_FIRST_TIME); | |
754 | if (rest <= 0) { | |
755 | struct smc_clc_msg_decline dclc; | |
756 | ||
757 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
758 | SMC_CLC_DECLINE); | |
75d320d6 | 759 | return rc; |
9bf9abea UB |
760 | } |
761 | ||
75d320d6 KG |
762 | if (link->llc_confirm_resp_rc) |
763 | return SMC_CLC_DECL_RMBE_EC; | |
764 | ||
52bedf37 KG |
765 | /* send ADD LINK request to client over the RoCE fabric */ |
766 | rc = smc_llc_send_add_link(link, | |
767 | link->smcibdev->mac[link->ibport - 1], | |
768 | &link->smcibdev->gid[link->ibport - 1], | |
769 | SMC_LLC_REQ); | |
770 | if (rc < 0) | |
771 | return SMC_CLC_DECL_TCL; | |
772 | ||
773 | /* receive ADD LINK response from client over the RoCE fabric */ | |
774 | rest = wait_for_completion_interruptible_timeout(&link->llc_add_resp, | |
775 | SMC_LLC_WAIT_TIME); | |
776 | if (rest <= 0) { | |
777 | struct smc_clc_msg_decline dclc; | |
778 | ||
779 | rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc), | |
780 | SMC_CLC_DECLINE); | |
781 | return rc; | |
782 | } | |
783 | ||
877ae5be | 784 | smc_llc_link_active(link, net->ipv4.sysctl_tcp_keepalive_time); |
52bedf37 | 785 | |
75d320d6 | 786 | return 0; |
9bf9abea UB |
787 | } |
788 | ||
a046d57d UB |
789 | /* setup for RDMA connection of server */ |
790 | static void smc_listen_work(struct work_struct *work) | |
791 | { | |
792 | struct smc_sock *new_smc = container_of(work, struct smc_sock, | |
793 | smc_listen_work); | |
e7b7a64a | 794 | struct smc_clc_msg_proposal_prefix *pclc_prfx; |
a046d57d UB |
795 | struct socket *newclcsock = new_smc->clcsock; |
796 | struct smc_sock *lsmc = new_smc->listen_smc; | |
797 | struct smc_clc_msg_accept_confirm cclc; | |
0cfdd8f9 | 798 | int local_contact = SMC_REUSE_CONTACT; |
a046d57d | 799 | struct sock *newsmcsk = &new_smc->sk; |
e7b7a64a | 800 | struct smc_clc_msg_proposal *pclc; |
a046d57d | 801 | struct smc_ib_device *smcibdev; |
e7b7a64a | 802 | u8 buf[SMC_CLC_MAX_LEN]; |
0cfdd8f9 | 803 | struct smc_link *link; |
a046d57d | 804 | int reason_code = 0; |
9b2c45d4 | 805 | int rc = 0; |
a046d57d UB |
806 | u8 ibport; |
807 | ||
ee9dfbef UB |
808 | if (new_smc->use_fallback) |
809 | goto out_connected; | |
810 | ||
c5c1cc9c UB |
811 | /* check if peer is smc capable */ |
812 | if (!tcp_sk(newclcsock->sk)->syn_smc) { | |
813 | new_smc->use_fallback = true; | |
814 | goto out_connected; | |
815 | } | |
816 | ||
a046d57d UB |
817 | /* do inband token exchange - |
818 | *wait for and receive SMC Proposal CLC message | |
819 | */ | |
e7b7a64a | 820 | reason_code = smc_clc_wait_msg(new_smc, &buf, sizeof(buf), |
a046d57d UB |
821 | SMC_CLC_PROPOSAL); |
822 | if (reason_code < 0) | |
823 | goto out_err; | |
824 | if (reason_code > 0) | |
825 | goto decline_rdma; | |
826 | ||
827 | /* IPSec connections opt out of SMC-R optimizations */ | |
828 | if (using_ipsec(new_smc)) { | |
829 | reason_code = SMC_CLC_DECL_IPSEC; | |
830 | goto decline_rdma; | |
831 | } | |
832 | ||
833 | /* PNET table look up: search active ib_device and port | |
834 | * within same PNETID that also contains the ethernet device | |
835 | * used for the internal TCP socket | |
836 | */ | |
837 | smc_pnet_find_roce_resource(newclcsock->sk, &smcibdev, &ibport); | |
838 | if (!smcibdev) { | |
839 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ | |
840 | goto decline_rdma; | |
841 | } | |
842 | ||
e7b7a64a UB |
843 | pclc = (struct smc_clc_msg_proposal *)&buf; |
844 | pclc_prfx = smc_clc_proposal_get_prefix(pclc); | |
c246d942 KG |
845 | |
846 | rc = smc_clc_prfx_match(newclcsock, pclc_prfx); | |
847 | if (rc) { | |
a046d57d UB |
848 | reason_code = SMC_CLC_DECL_CNFERR; /* configuration error */ |
849 | goto decline_rdma; | |
850 | } | |
851 | ||
0cfdd8f9 UB |
852 | /* allocate connection / link group */ |
853 | mutex_lock(&smc_create_lgr_pending); | |
be6d467b KG |
854 | local_contact = smc_conn_create(new_smc, smcibdev, ibport, &pclc->lcl, |
855 | 0); | |
0cfdd8f9 UB |
856 | if (local_contact < 0) { |
857 | rc = local_contact; | |
858 | if (rc == -ENOMEM) | |
859 | reason_code = SMC_CLC_DECL_MEM;/* insufficient memory*/ | |
145686ba | 860 | goto decline_rdma_unlock; |
0cfdd8f9 UB |
861 | } |
862 | link = &new_smc->conn.lgr->lnk[SMC_SINGLE_LINK]; | |
a046d57d | 863 | |
3e034725 UB |
864 | /* create send buffer and rmb */ |
865 | rc = smc_buf_create(new_smc); | |
cd6851f3 UB |
866 | if (rc) { |
867 | reason_code = SMC_CLC_DECL_MEM; | |
145686ba | 868 | goto decline_rdma_unlock; |
cd6851f3 | 869 | } |
a046d57d | 870 | |
46c28dbd UB |
871 | smc_close_init(new_smc); |
872 | smc_rx_init(new_smc); | |
873 | ||
652a1e41 | 874 | if (local_contact != SMC_FIRST_CONTACT) { |
e63a5f8c | 875 | if (!new_smc->conn.rmb_desc->reused) { |
44aa81ce | 876 | if (smc_reg_rmb(link, new_smc->conn.rmb_desc, true)) { |
652a1e41 | 877 | reason_code = SMC_CLC_DECL_INTERR; |
145686ba | 878 | goto decline_rdma_unlock; |
652a1e41 UB |
879 | } |
880 | } | |
881 | } | |
10428dd8 | 882 | smc_rmb_sync_sg_for_device(&new_smc->conn); |
652a1e41 | 883 | |
0cfdd8f9 | 884 | rc = smc_clc_send_accept(new_smc, local_contact); |
a046d57d | 885 | if (rc) |
145686ba | 886 | goto out_err_unlock; |
a046d57d UB |
887 | |
888 | /* receive SMC Confirm CLC message */ | |
889 | reason_code = smc_clc_wait_msg(new_smc, &cclc, sizeof(cclc), | |
890 | SMC_CLC_CONFIRM); | |
891 | if (reason_code < 0) | |
145686ba | 892 | goto out_err_unlock; |
a046d57d | 893 | if (reason_code > 0) |
145686ba | 894 | goto decline_rdma_unlock; |
0cfdd8f9 UB |
895 | smc_conn_save_peer_info(new_smc, &cclc); |
896 | if (local_contact == SMC_FIRST_CONTACT) | |
897 | smc_link_save_peer_info(link, &cclc); | |
a046d57d | 898 | |
bd4ad577 UB |
899 | rc = smc_rmb_rtoken_handling(&new_smc->conn, &cclc); |
900 | if (rc) { | |
901 | reason_code = SMC_CLC_DECL_INTERR; | |
145686ba | 902 | goto decline_rdma_unlock; |
bd4ad577 UB |
903 | } |
904 | ||
bd4ad577 UB |
905 | if (local_contact == SMC_FIRST_CONTACT) { |
906 | rc = smc_ib_ready_link(link); | |
907 | if (rc) { | |
908 | reason_code = SMC_CLC_DECL_INTERR; | |
145686ba | 909 | goto decline_rdma_unlock; |
bd4ad577 | 910 | } |
9bf9abea UB |
911 | /* QP confirmation over RoCE fabric */ |
912 | reason_code = smc_serv_conf_first_link(new_smc); | |
0c9f1515 | 913 | if (reason_code < 0) |
9bf9abea | 914 | /* peer is not aware of a problem */ |
145686ba | 915 | goto out_err_unlock; |
9bf9abea | 916 | if (reason_code > 0) |
145686ba | 917 | goto decline_rdma_unlock; |
bd4ad577 | 918 | } |
a046d57d | 919 | |
e6727f39 | 920 | smc_tx_init(new_smc); |
145686ba | 921 | mutex_unlock(&smc_create_lgr_pending); |
e6727f39 | 922 | |
a046d57d UB |
923 | out_connected: |
924 | sk_refcnt_debug_inc(newsmcsk); | |
b38d7324 UB |
925 | if (newsmcsk->sk_state == SMC_INIT) |
926 | newsmcsk->sk_state = SMC_ACTIVE; | |
a046d57d | 927 | enqueue: |
b38d7324 | 928 | lock_sock_nested(&lsmc->sk, SINGLE_DEPTH_NESTING); |
a046d57d UB |
929 | if (lsmc->sk.sk_state == SMC_LISTEN) { |
930 | smc_accept_enqueue(&lsmc->sk, newsmcsk); | |
931 | } else { /* no longer listening */ | |
932 | smc_close_non_accepted(newsmcsk); | |
933 | } | |
934 | release_sock(&lsmc->sk); | |
935 | ||
936 | /* Wake up accept */ | |
937 | lsmc->sk.sk_data_ready(&lsmc->sk); | |
938 | sock_put(&lsmc->sk); /* sock_hold in smc_tcp_listen_work */ | |
939 | return; | |
940 | ||
145686ba | 941 | decline_rdma_unlock: |
610db66f UB |
942 | if (local_contact == SMC_FIRST_CONTACT) |
943 | smc_lgr_forget(new_smc->conn.lgr); | |
145686ba | 944 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d UB |
945 | decline_rdma: |
946 | /* RDMA setup failed, switch back to TCP */ | |
0cfdd8f9 | 947 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
948 | new_smc->use_fallback = true; |
949 | if (reason_code && (reason_code != SMC_CLC_DECL_REPLY)) { | |
0c9f1515 | 950 | if (smc_clc_send_decline(new_smc, reason_code) < 0) |
a046d57d UB |
951 | goto out_err; |
952 | } | |
953 | goto out_connected; | |
954 | ||
145686ba | 955 | out_err_unlock: |
610db66f UB |
956 | if (local_contact == SMC_FIRST_CONTACT) |
957 | smc_lgr_forget(new_smc->conn.lgr); | |
145686ba | 958 | mutex_unlock(&smc_create_lgr_pending); |
a046d57d | 959 | out_err: |
51f1de79 UB |
960 | if (newsmcsk->sk_state == SMC_INIT) |
961 | sock_put(&new_smc->sk); /* passive closing */ | |
a046d57d | 962 | newsmcsk->sk_state = SMC_CLOSED; |
b38d7324 | 963 | smc_conn_free(&new_smc->conn); |
a046d57d UB |
964 | goto enqueue; /* queue new sock with sk_err set */ |
965 | } | |
966 | ||
967 | static void smc_tcp_listen_work(struct work_struct *work) | |
968 | { | |
969 | struct smc_sock *lsmc = container_of(work, struct smc_sock, | |
970 | tcp_listen_work); | |
3163c507 | 971 | struct sock *lsk = &lsmc->sk; |
a046d57d UB |
972 | struct smc_sock *new_smc; |
973 | int rc = 0; | |
974 | ||
3163c507 UB |
975 | lock_sock(lsk); |
976 | while (lsk->sk_state == SMC_LISTEN) { | |
a046d57d UB |
977 | rc = smc_clcsock_accept(lsmc, &new_smc); |
978 | if (rc) | |
979 | goto out; | |
980 | if (!new_smc) | |
981 | continue; | |
982 | ||
983 | new_smc->listen_smc = lsmc; | |
ee9dfbef | 984 | new_smc->use_fallback = lsmc->use_fallback; |
3163c507 | 985 | sock_hold(lsk); /* sock_put in smc_listen_work */ |
a046d57d UB |
986 | INIT_WORK(&new_smc->smc_listen_work, smc_listen_work); |
987 | smc_copy_sock_settings_to_smc(new_smc); | |
51f1de79 UB |
988 | sock_hold(&new_smc->sk); /* sock_put in passive closing */ |
989 | if (!schedule_work(&new_smc->smc_listen_work)) | |
990 | sock_put(&new_smc->sk); | |
a046d57d UB |
991 | } |
992 | ||
993 | out: | |
3163c507 | 994 | release_sock(lsk); |
51f1de79 | 995 | sock_put(&lsmc->sk); /* sock_hold in smc_listen */ |
a046d57d UB |
996 | } |
997 | ||
ac713874 UB |
998 | static int smc_listen(struct socket *sock, int backlog) |
999 | { | |
1000 | struct sock *sk = sock->sk; | |
1001 | struct smc_sock *smc; | |
1002 | int rc; | |
1003 | ||
1004 | smc = smc_sk(sk); | |
1005 | lock_sock(sk); | |
1006 | ||
1007 | rc = -EINVAL; | |
1008 | if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN)) | |
1009 | goto out; | |
1010 | ||
1011 | rc = 0; | |
1012 | if (sk->sk_state == SMC_LISTEN) { | |
1013 | sk->sk_max_ack_backlog = backlog; | |
1014 | goto out; | |
1015 | } | |
1016 | /* some socket options are handled in core, so we could not apply | |
1017 | * them to the clc socket -- copy smc socket options to clc socket | |
1018 | */ | |
1019 | smc_copy_sock_settings_to_clc(smc); | |
ee9dfbef UB |
1020 | if (!smc->use_fallback) |
1021 | tcp_sk(smc->clcsock->sk)->syn_smc = 1; | |
ac713874 UB |
1022 | |
1023 | rc = kernel_listen(smc->clcsock, backlog); | |
1024 | if (rc) | |
1025 | goto out; | |
1026 | sk->sk_max_ack_backlog = backlog; | |
1027 | sk->sk_ack_backlog = 0; | |
1028 | sk->sk_state = SMC_LISTEN; | |
a046d57d | 1029 | INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work); |
51f1de79 UB |
1030 | sock_hold(sk); /* sock_hold in tcp_listen_worker */ |
1031 | if (!schedule_work(&smc->tcp_listen_work)) | |
1032 | sock_put(sk); | |
ac713874 UB |
1033 | |
1034 | out: | |
1035 | release_sock(sk); | |
1036 | return rc; | |
1037 | } | |
1038 | ||
1039 | static int smc_accept(struct socket *sock, struct socket *new_sock, | |
cdfbabfb | 1040 | int flags, bool kern) |
ac713874 | 1041 | { |
a046d57d UB |
1042 | struct sock *sk = sock->sk, *nsk; |
1043 | DECLARE_WAITQUEUE(wait, current); | |
ac713874 | 1044 | struct smc_sock *lsmc; |
a046d57d UB |
1045 | long timeo; |
1046 | int rc = 0; | |
ac713874 UB |
1047 | |
1048 | lsmc = smc_sk(sk); | |
51f1de79 | 1049 | sock_hold(sk); /* sock_put below */ |
ac713874 UB |
1050 | lock_sock(sk); |
1051 | ||
1052 | if (lsmc->sk.sk_state != SMC_LISTEN) { | |
1053 | rc = -EINVAL; | |
abb190f1 | 1054 | release_sock(sk); |
ac713874 UB |
1055 | goto out; |
1056 | } | |
1057 | ||
a046d57d UB |
1058 | /* Wait for an incoming connection */ |
1059 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
1060 | add_wait_queue_exclusive(sk_sleep(sk), &wait); | |
1061 | while (!(nsk = smc_accept_dequeue(sk, new_sock))) { | |
1062 | set_current_state(TASK_INTERRUPTIBLE); | |
1063 | if (!timeo) { | |
1064 | rc = -EAGAIN; | |
1065 | break; | |
1066 | } | |
1067 | release_sock(sk); | |
1068 | timeo = schedule_timeout(timeo); | |
1069 | /* wakeup by sk_data_ready in smc_listen_work() */ | |
1070 | sched_annotate_sleep(); | |
1071 | lock_sock(sk); | |
1072 | if (signal_pending(current)) { | |
1073 | rc = sock_intr_errno(timeo); | |
1074 | break; | |
1075 | } | |
1076 | } | |
1077 | set_current_state(TASK_RUNNING); | |
1078 | remove_wait_queue(sk_sleep(sk), &wait); | |
ac713874 | 1079 | |
a046d57d UB |
1080 | if (!rc) |
1081 | rc = sock_error(nsk); | |
abb190f1 UB |
1082 | release_sock(sk); |
1083 | if (rc) | |
1084 | goto out; | |
1085 | ||
1086 | if (lsmc->sockopt_defer_accept && !(flags & O_NONBLOCK)) { | |
1087 | /* wait till data arrives on the socket */ | |
1088 | timeo = msecs_to_jiffies(lsmc->sockopt_defer_accept * | |
1089 | MSEC_PER_SEC); | |
1090 | if (smc_sk(nsk)->use_fallback) { | |
1091 | struct sock *clcsk = smc_sk(nsk)->clcsock->sk; | |
1092 | ||
1093 | lock_sock(clcsk); | |
1094 | if (skb_queue_empty(&clcsk->sk_receive_queue)) | |
1095 | sk_wait_data(clcsk, &timeo, NULL); | |
1096 | release_sock(clcsk); | |
1097 | } else if (!atomic_read(&smc_sk(nsk)->conn.bytes_to_rcv)) { | |
1098 | lock_sock(nsk); | |
b51fa1b1 | 1099 | smc_rx_wait(smc_sk(nsk), &timeo, smc_rx_data_available); |
abb190f1 UB |
1100 | release_sock(nsk); |
1101 | } | |
1102 | } | |
ac713874 UB |
1103 | |
1104 | out: | |
51f1de79 | 1105 | sock_put(sk); /* sock_hold above */ |
ac713874 UB |
1106 | return rc; |
1107 | } | |
1108 | ||
1109 | static int smc_getname(struct socket *sock, struct sockaddr *addr, | |
9b2c45d4 | 1110 | int peer) |
ac713874 UB |
1111 | { |
1112 | struct smc_sock *smc; | |
1113 | ||
b38d7324 UB |
1114 | if (peer && (sock->sk->sk_state != SMC_ACTIVE) && |
1115 | (sock->sk->sk_state != SMC_APPCLOSEWAIT1)) | |
ac713874 UB |
1116 | return -ENOTCONN; |
1117 | ||
1118 | smc = smc_sk(sock->sk); | |
1119 | ||
9b2c45d4 | 1120 | return smc->clcsock->ops->getname(smc->clcsock, addr, peer); |
ac713874 UB |
1121 | } |
1122 | ||
1123 | static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) | |
1124 | { | |
1125 | struct sock *sk = sock->sk; | |
1126 | struct smc_sock *smc; | |
1127 | int rc = -EPIPE; | |
1128 | ||
1129 | smc = smc_sk(sk); | |
1130 | lock_sock(sk); | |
b38d7324 UB |
1131 | if ((sk->sk_state != SMC_ACTIVE) && |
1132 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1133 | (sk->sk_state != SMC_INIT)) | |
ac713874 | 1134 | goto out; |
ee9dfbef UB |
1135 | |
1136 | if (msg->msg_flags & MSG_FASTOPEN) { | |
1137 | if (sk->sk_state == SMC_INIT) { | |
1138 | smc->use_fallback = true; | |
1139 | } else { | |
1140 | rc = -EINVAL; | |
1141 | goto out; | |
1142 | } | |
1143 | } | |
1144 | ||
ac713874 UB |
1145 | if (smc->use_fallback) |
1146 | rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len); | |
1147 | else | |
e6727f39 | 1148 | rc = smc_tx_sendmsg(smc, msg, len); |
ac713874 UB |
1149 | out: |
1150 | release_sock(sk); | |
1151 | return rc; | |
1152 | } | |
1153 | ||
1154 | static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, | |
1155 | int flags) | |
1156 | { | |
1157 | struct sock *sk = sock->sk; | |
1158 | struct smc_sock *smc; | |
1159 | int rc = -ENOTCONN; | |
1160 | ||
1161 | smc = smc_sk(sk); | |
1162 | lock_sock(sk); | |
b38d7324 UB |
1163 | if ((sk->sk_state == SMC_INIT) || |
1164 | (sk->sk_state == SMC_LISTEN) || | |
1165 | (sk->sk_state == SMC_CLOSED)) | |
ac713874 UB |
1166 | goto out; |
1167 | ||
b38d7324 UB |
1168 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { |
1169 | rc = 0; | |
1170 | goto out; | |
1171 | } | |
1172 | ||
9014db20 | 1173 | if (smc->use_fallback) { |
ac713874 | 1174 | rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags); |
9014db20 SR |
1175 | } else { |
1176 | msg->msg_namelen = 0; | |
1177 | rc = smc_rx_recvmsg(smc, msg, NULL, len, flags); | |
1178 | } | |
b38d7324 | 1179 | |
ac713874 UB |
1180 | out: |
1181 | release_sock(sk); | |
1182 | return rc; | |
1183 | } | |
1184 | ||
ade994f4 | 1185 | static __poll_t smc_accept_poll(struct sock *parent) |
a046d57d | 1186 | { |
8dce2786 | 1187 | struct smc_sock *isk = smc_sk(parent); |
63e2480c | 1188 | __poll_t mask = 0; |
a046d57d | 1189 | |
8dce2786 UB |
1190 | spin_lock(&isk->accept_q_lock); |
1191 | if (!list_empty(&isk->accept_q)) | |
a9a08845 | 1192 | mask = EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1193 | spin_unlock(&isk->accept_q_lock); |
a046d57d | 1194 | |
8dce2786 | 1195 | return mask; |
a046d57d UB |
1196 | } |
1197 | ||
ade994f4 | 1198 | static __poll_t smc_poll(struct file *file, struct socket *sock, |
ac713874 UB |
1199 | poll_table *wait) |
1200 | { | |
1201 | struct sock *sk = sock->sk; | |
e6c8adca | 1202 | __poll_t mask = 0; |
ac713874 | 1203 | struct smc_sock *smc; |
a046d57d | 1204 | int rc; |
ac713874 | 1205 | |
8dce2786 | 1206 | if (!sk) |
a9a08845 | 1207 | return EPOLLNVAL; |
8dce2786 | 1208 | |
ac713874 | 1209 | smc = smc_sk(sock->sk); |
8dce2786 UB |
1210 | sock_hold(sk); |
1211 | lock_sock(sk); | |
a046d57d UB |
1212 | if ((sk->sk_state == SMC_INIT) || smc->use_fallback) { |
1213 | /* delegate to CLC child sock */ | |
8dce2786 | 1214 | release_sock(sk); |
ac713874 | 1215 | mask = smc->clcsock->ops->poll(file, smc->clcsock, wait); |
ac713874 | 1216 | lock_sock(sk); |
784813ae UB |
1217 | sk->sk_err = smc->clcsock->sk->sk_err; |
1218 | if (sk->sk_err) { | |
1219 | mask |= EPOLLERR; | |
1220 | } else { | |
1221 | /* if non-blocking connect finished ... */ | |
1222 | if (sk->sk_state == SMC_INIT && | |
1223 | mask & EPOLLOUT && | |
1224 | smc->clcsock->sk->sk_state != TCP_CLOSE) { | |
a046d57d UB |
1225 | rc = smc_connect_rdma(smc); |
1226 | if (rc < 0) | |
a9a08845 | 1227 | mask |= EPOLLERR; |
8dce2786 | 1228 | /* success cases including fallback */ |
a9a08845 | 1229 | mask |= EPOLLOUT | EPOLLWRNORM; |
a046d57d | 1230 | } |
ac713874 | 1231 | } |
ac713874 | 1232 | } else { |
8dce2786 UB |
1233 | if (sk->sk_state != SMC_CLOSED) { |
1234 | release_sock(sk); | |
1235 | sock_poll_wait(file, sk_sleep(sk), wait); | |
1236 | lock_sock(sk); | |
1237 | } | |
a046d57d | 1238 | if (sk->sk_err) |
a9a08845 | 1239 | mask |= EPOLLERR; |
b38d7324 UB |
1240 | if ((sk->sk_shutdown == SHUTDOWN_MASK) || |
1241 | (sk->sk_state == SMC_CLOSED)) | |
a9a08845 | 1242 | mask |= EPOLLHUP; |
8dce2786 UB |
1243 | if (sk->sk_state == SMC_LISTEN) { |
1244 | /* woken up by sk_data_ready in smc_listen_work() */ | |
1245 | mask = smc_accept_poll(sk); | |
1246 | } else { | |
1247 | if (atomic_read(&smc->conn.sndbuf_space) || | |
1248 | sk->sk_shutdown & SEND_SHUTDOWN) { | |
a9a08845 | 1249 | mask |= EPOLLOUT | EPOLLWRNORM; |
8dce2786 UB |
1250 | } else { |
1251 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); | |
1252 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1253 | } | |
1254 | if (atomic_read(&smc->conn.bytes_to_rcv)) | |
a9a08845 | 1255 | mask |= EPOLLIN | EPOLLRDNORM; |
8dce2786 | 1256 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
a9a08845 | 1257 | mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP; |
8dce2786 | 1258 | if (sk->sk_state == SMC_APPCLOSEWAIT1) |
a9a08845 | 1259 | mask |= EPOLLIN; |
8dce2786 | 1260 | } |
b38d7324 | 1261 | |
ac713874 | 1262 | } |
8dce2786 UB |
1263 | release_sock(sk); |
1264 | sock_put(sk); | |
ac713874 UB |
1265 | |
1266 | return mask; | |
1267 | } | |
1268 | ||
1269 | static int smc_shutdown(struct socket *sock, int how) | |
1270 | { | |
1271 | struct sock *sk = sock->sk; | |
1272 | struct smc_sock *smc; | |
1273 | int rc = -EINVAL; | |
b38d7324 | 1274 | int rc1 = 0; |
ac713874 UB |
1275 | |
1276 | smc = smc_sk(sk); | |
1277 | ||
1278 | if ((how < SHUT_RD) || (how > SHUT_RDWR)) | |
b38d7324 | 1279 | return rc; |
ac713874 UB |
1280 | |
1281 | lock_sock(sk); | |
1282 | ||
1283 | rc = -ENOTCONN; | |
b38d7324 UB |
1284 | if ((sk->sk_state != SMC_LISTEN) && |
1285 | (sk->sk_state != SMC_ACTIVE) && | |
1286 | (sk->sk_state != SMC_PEERCLOSEWAIT1) && | |
1287 | (sk->sk_state != SMC_PEERCLOSEWAIT2) && | |
1288 | (sk->sk_state != SMC_APPCLOSEWAIT1) && | |
1289 | (sk->sk_state != SMC_APPCLOSEWAIT2) && | |
1290 | (sk->sk_state != SMC_APPFINCLOSEWAIT)) | |
ac713874 UB |
1291 | goto out; |
1292 | if (smc->use_fallback) { | |
1293 | rc = kernel_sock_shutdown(smc->clcsock, how); | |
1294 | sk->sk_shutdown = smc->clcsock->sk->sk_shutdown; | |
1295 | if (sk->sk_shutdown == SHUTDOWN_MASK) | |
1296 | sk->sk_state = SMC_CLOSED; | |
b38d7324 | 1297 | goto out; |
ac713874 | 1298 | } |
b38d7324 UB |
1299 | switch (how) { |
1300 | case SHUT_RDWR: /* shutdown in both directions */ | |
1301 | rc = smc_close_active(smc); | |
1302 | break; | |
1303 | case SHUT_WR: | |
1304 | rc = smc_close_shutdown_write(smc); | |
1305 | break; | |
1306 | case SHUT_RD: | |
1255fcb2 UB |
1307 | rc = 0; |
1308 | /* nothing more to do because peer is not involved */ | |
b38d7324 UB |
1309 | break; |
1310 | } | |
1255fcb2 UB |
1311 | if (smc->clcsock) |
1312 | rc1 = kernel_sock_shutdown(smc->clcsock, how); | |
b38d7324 UB |
1313 | /* map sock_shutdown_cmd constants to sk_shutdown value range */ |
1314 | sk->sk_shutdown |= how + 1; | |
ac713874 UB |
1315 | |
1316 | out: | |
1317 | release_sock(sk); | |
b38d7324 | 1318 | return rc ? rc : rc1; |
ac713874 UB |
1319 | } |
1320 | ||
1321 | static int smc_setsockopt(struct socket *sock, int level, int optname, | |
1322 | char __user *optval, unsigned int optlen) | |
1323 | { | |
1324 | struct sock *sk = sock->sk; | |
1325 | struct smc_sock *smc; | |
01d2f7e2 | 1326 | int val, rc; |
ac713874 UB |
1327 | |
1328 | smc = smc_sk(sk); | |
1329 | ||
1330 | /* generic setsockopts reaching us here always apply to the | |
1331 | * CLC socket | |
1332 | */ | |
ee9dfbef UB |
1333 | rc = smc->clcsock->ops->setsockopt(smc->clcsock, level, optname, |
1334 | optval, optlen); | |
1335 | if (smc->clcsock->sk->sk_err) { | |
1336 | sk->sk_err = smc->clcsock->sk->sk_err; | |
1337 | sk->sk_error_report(sk); | |
1338 | } | |
1339 | if (rc) | |
1340 | return rc; | |
1341 | ||
01d2f7e2 UB |
1342 | if (optlen < sizeof(int)) |
1343 | return rc; | |
1344 | get_user(val, (int __user *)optval); | |
1345 | ||
ee9dfbef UB |
1346 | lock_sock(sk); |
1347 | switch (optname) { | |
1348 | case TCP_ULP: | |
1349 | case TCP_FASTOPEN: | |
1350 | case TCP_FASTOPEN_CONNECT: | |
1351 | case TCP_FASTOPEN_KEY: | |
1352 | case TCP_FASTOPEN_NO_COOKIE: | |
1353 | /* option not supported by SMC */ | |
1354 | if (sk->sk_state == SMC_INIT) { | |
1355 | smc->use_fallback = true; | |
1356 | } else { | |
1357 | if (!smc->use_fallback) | |
1358 | rc = -EINVAL; | |
1359 | } | |
1360 | break; | |
01d2f7e2 UB |
1361 | case TCP_NODELAY: |
1362 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1363 | if (val && !smc->use_fallback) |
01d2f7e2 UB |
1364 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1365 | 0); | |
1366 | } | |
1367 | break; | |
1368 | case TCP_CORK: | |
1369 | if (sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) { | |
569bc643 | 1370 | if (!val && !smc->use_fallback) |
01d2f7e2 UB |
1371 | mod_delayed_work(system_wq, &smc->conn.tx_work, |
1372 | 0); | |
1373 | } | |
1374 | break; | |
abb190f1 UB |
1375 | case TCP_DEFER_ACCEPT: |
1376 | smc->sockopt_defer_accept = val; | |
1377 | break; | |
ee9dfbef UB |
1378 | default: |
1379 | break; | |
1380 | } | |
1381 | release_sock(sk); | |
1382 | ||
1383 | return rc; | |
ac713874 UB |
1384 | } |
1385 | ||
1386 | static int smc_getsockopt(struct socket *sock, int level, int optname, | |
1387 | char __user *optval, int __user *optlen) | |
1388 | { | |
1389 | struct smc_sock *smc; | |
1390 | ||
1391 | smc = smc_sk(sock->sk); | |
1392 | /* socket options apply to the CLC socket */ | |
1393 | return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname, | |
1394 | optval, optlen); | |
1395 | } | |
1396 | ||
1397 | static int smc_ioctl(struct socket *sock, unsigned int cmd, | |
1398 | unsigned long arg) | |
1399 | { | |
1400 | struct smc_sock *smc; | |
9b67e26f | 1401 | int answ; |
ac713874 UB |
1402 | |
1403 | smc = smc_sk(sock->sk); | |
9b67e26f UB |
1404 | if (smc->use_fallback) { |
1405 | if (!smc->clcsock) | |
1406 | return -EBADF; | |
ac713874 | 1407 | return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg); |
9b67e26f UB |
1408 | } |
1409 | switch (cmd) { | |
1410 | case SIOCINQ: /* same as FIONREAD */ | |
1411 | if (smc->sk.sk_state == SMC_LISTEN) | |
1412 | return -EINVAL; | |
1413 | answ = atomic_read(&smc->conn.bytes_to_rcv); | |
1414 | break; | |
1415 | case SIOCOUTQ: | |
1416 | /* output queue size (not send + not acked) */ | |
1417 | if (smc->sk.sk_state == SMC_LISTEN) | |
1418 | return -EINVAL; | |
69cb7dc0 | 1419 | answ = smc->conn.sndbuf_desc->len - |
9b67e26f UB |
1420 | atomic_read(&smc->conn.sndbuf_space); |
1421 | break; | |
1422 | case SIOCOUTQNSD: | |
1423 | /* output queue size (not send only) */ | |
1424 | if (smc->sk.sk_state == SMC_LISTEN) | |
1425 | return -EINVAL; | |
1426 | answ = smc_tx_prepared_sends(&smc->conn); | |
1427 | break; | |
1428 | default: | |
1429 | return -ENOIOCTLCMD; | |
1430 | } | |
1431 | ||
1432 | return put_user(answ, (int __user *)arg); | |
ac713874 UB |
1433 | } |
1434 | ||
1435 | static ssize_t smc_sendpage(struct socket *sock, struct page *page, | |
1436 | int offset, size_t size, int flags) | |
1437 | { | |
1438 | struct sock *sk = sock->sk; | |
1439 | struct smc_sock *smc; | |
1440 | int rc = -EPIPE; | |
1441 | ||
1442 | smc = smc_sk(sk); | |
1443 | lock_sock(sk); | |
bda27ff5 SR |
1444 | if (sk->sk_state != SMC_ACTIVE) { |
1445 | release_sock(sk); | |
ac713874 | 1446 | goto out; |
bda27ff5 SR |
1447 | } |
1448 | release_sock(sk); | |
ac713874 UB |
1449 | if (smc->use_fallback) |
1450 | rc = kernel_sendpage(smc->clcsock, page, offset, | |
1451 | size, flags); | |
1452 | else | |
1453 | rc = sock_no_sendpage(sock, page, offset, size, flags); | |
1454 | ||
1455 | out: | |
ac713874 UB |
1456 | return rc; |
1457 | } | |
1458 | ||
9014db20 SR |
1459 | /* Map the affected portions of the rmbe into an spd, note the number of bytes |
1460 | * to splice in conn->splice_pending, and press 'go'. Delays consumer cursor | |
1461 | * updates till whenever a respective page has been fully processed. | |
1462 | * Note that subsequent recv() calls have to wait till all splice() processing | |
1463 | * completed. | |
1464 | */ | |
ac713874 UB |
1465 | static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos, |
1466 | struct pipe_inode_info *pipe, size_t len, | |
9014db20 | 1467 | unsigned int flags) |
ac713874 UB |
1468 | { |
1469 | struct sock *sk = sock->sk; | |
1470 | struct smc_sock *smc; | |
1471 | int rc = -ENOTCONN; | |
1472 | ||
1473 | smc = smc_sk(sk); | |
1474 | lock_sock(sk); | |
9014db20 SR |
1475 | |
1476 | if (sk->sk_state == SMC_INIT || | |
1477 | sk->sk_state == SMC_LISTEN || | |
1478 | sk->sk_state == SMC_CLOSED) | |
1479 | goto out; | |
1480 | ||
1481 | if (sk->sk_state == SMC_PEERFINCLOSEWAIT) { | |
1482 | rc = 0; | |
ac713874 | 1483 | goto out; |
9014db20 SR |
1484 | } |
1485 | ||
ac713874 UB |
1486 | if (smc->use_fallback) { |
1487 | rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos, | |
1488 | pipe, len, flags); | |
1489 | } else { | |
9014db20 SR |
1490 | if (*ppos) { |
1491 | rc = -ESPIPE; | |
1492 | goto out; | |
1493 | } | |
1494 | if (flags & SPLICE_F_NONBLOCK) | |
1495 | flags = MSG_DONTWAIT; | |
1496 | else | |
1497 | flags = 0; | |
1498 | rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags); | |
ac713874 UB |
1499 | } |
1500 | out: | |
1501 | release_sock(sk); | |
9014db20 | 1502 | |
ac713874 UB |
1503 | return rc; |
1504 | } | |
1505 | ||
1506 | /* must look like tcp */ | |
1507 | static const struct proto_ops smc_sock_ops = { | |
1508 | .family = PF_SMC, | |
1509 | .owner = THIS_MODULE, | |
1510 | .release = smc_release, | |
1511 | .bind = smc_bind, | |
1512 | .connect = smc_connect, | |
1513 | .socketpair = sock_no_socketpair, | |
1514 | .accept = smc_accept, | |
1515 | .getname = smc_getname, | |
1516 | .poll = smc_poll, | |
1517 | .ioctl = smc_ioctl, | |
1518 | .listen = smc_listen, | |
1519 | .shutdown = smc_shutdown, | |
1520 | .setsockopt = smc_setsockopt, | |
1521 | .getsockopt = smc_getsockopt, | |
1522 | .sendmsg = smc_sendmsg, | |
1523 | .recvmsg = smc_recvmsg, | |
1524 | .mmap = sock_no_mmap, | |
1525 | .sendpage = smc_sendpage, | |
1526 | .splice_read = smc_splice_read, | |
1527 | }; | |
1528 | ||
1529 | static int smc_create(struct net *net, struct socket *sock, int protocol, | |
1530 | int kern) | |
1531 | { | |
aaa4d33f | 1532 | int family = (protocol == SMCPROTO_SMC6) ? PF_INET6 : PF_INET; |
ac713874 UB |
1533 | struct smc_sock *smc; |
1534 | struct sock *sk; | |
1535 | int rc; | |
1536 | ||
1537 | rc = -ESOCKTNOSUPPORT; | |
1538 | if (sock->type != SOCK_STREAM) | |
1539 | goto out; | |
1540 | ||
1541 | rc = -EPROTONOSUPPORT; | |
aaa4d33f | 1542 | if (protocol != SMCPROTO_SMC && protocol != SMCPROTO_SMC6) |
ac713874 UB |
1543 | goto out; |
1544 | ||
1545 | rc = -ENOBUFS; | |
1546 | sock->ops = &smc_sock_ops; | |
aaa4d33f | 1547 | sk = smc_sock_alloc(net, sock, protocol); |
ac713874 UB |
1548 | if (!sk) |
1549 | goto out; | |
1550 | ||
1551 | /* create internal TCP socket for CLC handshake and fallback */ | |
1552 | smc = smc_sk(sk); | |
a046d57d | 1553 | smc->use_fallback = false; /* assume rdma capability first */ |
aaa4d33f KG |
1554 | rc = sock_create_kern(net, family, SOCK_STREAM, IPPROTO_TCP, |
1555 | &smc->clcsock); | |
a5dcb73b | 1556 | if (rc) { |
ac713874 | 1557 | sk_common_release(sk); |
a5dcb73b DC |
1558 | goto out; |
1559 | } | |
cd6851f3 UB |
1560 | smc->sk.sk_sndbuf = max(smc->clcsock->sk->sk_sndbuf, SMC_BUF_MIN_SIZE); |
1561 | smc->sk.sk_rcvbuf = max(smc->clcsock->sk->sk_rcvbuf, SMC_BUF_MIN_SIZE); | |
ac713874 UB |
1562 | |
1563 | out: | |
1564 | return rc; | |
1565 | } | |
1566 | ||
1567 | static const struct net_proto_family smc_sock_family_ops = { | |
1568 | .family = PF_SMC, | |
1569 | .owner = THIS_MODULE, | |
1570 | .create = smc_create, | |
1571 | }; | |
1572 | ||
1573 | static int __init smc_init(void) | |
1574 | { | |
1575 | int rc; | |
1576 | ||
6812baab TR |
1577 | rc = smc_pnet_init(); |
1578 | if (rc) | |
1579 | return rc; | |
1580 | ||
9bf9abea UB |
1581 | rc = smc_llc_init(); |
1582 | if (rc) { | |
1583 | pr_err("%s: smc_llc_init fails with %d\n", __func__, rc); | |
1584 | goto out_pnet; | |
1585 | } | |
1586 | ||
5f08318f UB |
1587 | rc = smc_cdc_init(); |
1588 | if (rc) { | |
1589 | pr_err("%s: smc_cdc_init fails with %d\n", __func__, rc); | |
1590 | goto out_pnet; | |
1591 | } | |
1592 | ||
ac713874 UB |
1593 | rc = proto_register(&smc_proto, 1); |
1594 | if (rc) { | |
aaa4d33f | 1595 | pr_err("%s: proto_register(v4) fails with %d\n", __func__, rc); |
6812baab | 1596 | goto out_pnet; |
ac713874 UB |
1597 | } |
1598 | ||
aaa4d33f KG |
1599 | rc = proto_register(&smc_proto6, 1); |
1600 | if (rc) { | |
1601 | pr_err("%s: proto_register(v6) fails with %d\n", __func__, rc); | |
1602 | goto out_proto; | |
1603 | } | |
1604 | ||
ac713874 UB |
1605 | rc = sock_register(&smc_sock_family_ops); |
1606 | if (rc) { | |
1607 | pr_err("%s: sock_register fails with %d\n", __func__, rc); | |
aaa4d33f | 1608 | goto out_proto6; |
ac713874 | 1609 | } |
f16a7dd5 | 1610 | INIT_HLIST_HEAD(&smc_v4_hashinfo.ht); |
aaa4d33f | 1611 | INIT_HLIST_HEAD(&smc_v6_hashinfo.ht); |
ac713874 | 1612 | |
a4cf0443 UB |
1613 | rc = smc_ib_register_client(); |
1614 | if (rc) { | |
1615 | pr_err("%s: ib_register fails with %d\n", __func__, rc); | |
1616 | goto out_sock; | |
1617 | } | |
1618 | ||
c5c1cc9c | 1619 | static_branch_enable(&tcp_have_smc); |
ac713874 UB |
1620 | return 0; |
1621 | ||
a4cf0443 UB |
1622 | out_sock: |
1623 | sock_unregister(PF_SMC); | |
aaa4d33f KG |
1624 | out_proto6: |
1625 | proto_unregister(&smc_proto6); | |
ac713874 UB |
1626 | out_proto: |
1627 | proto_unregister(&smc_proto); | |
6812baab TR |
1628 | out_pnet: |
1629 | smc_pnet_exit(); | |
ac713874 UB |
1630 | return rc; |
1631 | } | |
1632 | ||
1633 | static void __exit smc_exit(void) | |
1634 | { | |
9fda3510 | 1635 | smc_core_exit(); |
c5c1cc9c | 1636 | static_branch_disable(&tcp_have_smc); |
a4cf0443 | 1637 | smc_ib_unregister_client(); |
ac713874 | 1638 | sock_unregister(PF_SMC); |
aaa4d33f | 1639 | proto_unregister(&smc_proto6); |
ac713874 | 1640 | proto_unregister(&smc_proto); |
6812baab | 1641 | smc_pnet_exit(); |
ac713874 UB |
1642 | } |
1643 | ||
1644 | module_init(smc_init); | |
1645 | module_exit(smc_exit); | |
1646 | ||
1647 | MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>"); | |
1648 | MODULE_DESCRIPTION("smc socket address family"); | |
1649 | MODULE_LICENSE("GPL"); | |
1650 | MODULE_ALIAS_NETPROTO(PF_SMC); |