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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b38d7324 UB |
2 | /* |
3 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
4 | * | |
5 | * Socket Closing - normal and abnormal | |
6 | * | |
7 | * Copyright IBM Corp. 2016 | |
8 | * | |
9 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
10 | */ | |
11 | ||
12 | #include <linux/workqueue.h> | |
c3edc401 IM |
13 | #include <linux/sched/signal.h> |
14 | ||
b38d7324 UB |
15 | #include <net/sock.h> |
16 | ||
17 | #include "smc.h" | |
18 | #include "smc_tx.h" | |
19 | #include "smc_cdc.h" | |
20 | #include "smc_close.h" | |
21 | ||
22 | #define SMC_CLOSE_WAIT_TX_PENDS_TIME (5 * HZ) | |
23 | ||
24 | static void smc_close_cleanup_listen(struct sock *parent) | |
25 | { | |
26 | struct sock *sk; | |
27 | ||
28 | /* Close non-accepted connections */ | |
29 | while ((sk = smc_accept_dequeue(parent, NULL))) | |
30 | smc_close_non_accepted(sk); | |
31 | } | |
32 | ||
33 | static void smc_close_wait_tx_pends(struct smc_sock *smc) | |
34 | { | |
35 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
36 | struct sock *sk = &smc->sk; | |
37 | signed long timeout; | |
38 | ||
39 | timeout = SMC_CLOSE_WAIT_TX_PENDS_TIME; | |
40 | add_wait_queue(sk_sleep(sk), &wait); | |
41 | while (!signal_pending(current) && timeout) { | |
42 | int rc; | |
43 | ||
44 | rc = sk_wait_event(sk, &timeout, | |
45 | !smc_cdc_tx_has_pending(&smc->conn), | |
46 | &wait); | |
47 | if (rc) | |
48 | break; | |
49 | } | |
50 | remove_wait_queue(sk_sleep(sk), &wait); | |
51 | } | |
52 | ||
53 | /* wait for sndbuf data being transmitted */ | |
54 | static void smc_close_stream_wait(struct smc_sock *smc, long timeout) | |
55 | { | |
56 | DEFINE_WAIT_FUNC(wait, woken_wake_function); | |
57 | struct sock *sk = &smc->sk; | |
58 | ||
59 | if (!timeout) | |
60 | return; | |
61 | ||
62 | if (!smc_tx_prepared_sends(&smc->conn)) | |
63 | return; | |
64 | ||
65 | smc->wait_close_tx_prepared = 1; | |
66 | add_wait_queue(sk_sleep(sk), &wait); | |
67 | while (!signal_pending(current) && timeout) { | |
68 | int rc; | |
69 | ||
70 | rc = sk_wait_event(sk, &timeout, | |
71 | !smc_tx_prepared_sends(&smc->conn) || | |
72 | (sk->sk_err == ECONNABORTED) || | |
73 | (sk->sk_err == ECONNRESET), | |
74 | &wait); | |
75 | if (rc) | |
76 | break; | |
77 | } | |
78 | remove_wait_queue(sk_sleep(sk), &wait); | |
79 | smc->wait_close_tx_prepared = 0; | |
80 | } | |
81 | ||
82 | void smc_close_wake_tx_prepared(struct smc_sock *smc) | |
83 | { | |
84 | if (smc->wait_close_tx_prepared) | |
85 | /* wake up socket closing */ | |
86 | smc->sk.sk_state_change(&smc->sk); | |
87 | } | |
88 | ||
89 | static int smc_close_wr(struct smc_connection *conn) | |
90 | { | |
91 | conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1; | |
92 | ||
93 | return smc_cdc_get_slot_and_msg_send(conn); | |
94 | } | |
95 | ||
96 | static int smc_close_final(struct smc_connection *conn) | |
97 | { | |
98 | if (atomic_read(&conn->bytes_to_rcv)) | |
99 | conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; | |
100 | else | |
101 | conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1; | |
102 | ||
103 | return smc_cdc_get_slot_and_msg_send(conn); | |
104 | } | |
105 | ||
106 | static int smc_close_abort(struct smc_connection *conn) | |
107 | { | |
108 | conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; | |
109 | ||
110 | return smc_cdc_get_slot_and_msg_send(conn); | |
111 | } | |
112 | ||
113 | /* terminate smc socket abnormally - active abort | |
114 | * RDMA communication no longer possible | |
115 | */ | |
116 | void smc_close_active_abort(struct smc_sock *smc) | |
117 | { | |
118 | struct smc_cdc_conn_state_flags *txflags = | |
119 | &smc->conn.local_tx_ctrl.conn_state_flags; | |
120 | ||
b38d7324 UB |
121 | smc->sk.sk_err = ECONNABORTED; |
122 | if (smc->clcsock && smc->clcsock->sk) { | |
123 | smc->clcsock->sk->sk_err = ECONNABORTED; | |
124 | smc->clcsock->sk->sk_state_change(smc->clcsock->sk); | |
125 | } | |
126 | switch (smc->sk.sk_state) { | |
127 | case SMC_INIT: | |
46c28dbd | 128 | case SMC_ACTIVE: |
b38d7324 UB |
129 | smc->sk.sk_state = SMC_PEERABORTWAIT; |
130 | break; | |
131 | case SMC_APPCLOSEWAIT1: | |
132 | case SMC_APPCLOSEWAIT2: | |
133 | txflags->peer_conn_abort = 1; | |
134 | sock_release(smc->clcsock); | |
135 | if (!smc_cdc_rxed_any_close(&smc->conn)) | |
136 | smc->sk.sk_state = SMC_PEERABORTWAIT; | |
137 | else | |
138 | smc->sk.sk_state = SMC_CLOSED; | |
139 | break; | |
140 | case SMC_PEERCLOSEWAIT1: | |
141 | case SMC_PEERCLOSEWAIT2: | |
142 | if (!txflags->peer_conn_closed) { | |
143 | smc->sk.sk_state = SMC_PEERABORTWAIT; | |
144 | txflags->peer_conn_abort = 1; | |
145 | sock_release(smc->clcsock); | |
146 | } else { | |
147 | smc->sk.sk_state = SMC_CLOSED; | |
148 | } | |
149 | break; | |
150 | case SMC_PROCESSABORT: | |
151 | case SMC_APPFINCLOSEWAIT: | |
152 | if (!txflags->peer_conn_closed) { | |
153 | txflags->peer_conn_abort = 1; | |
154 | sock_release(smc->clcsock); | |
155 | } | |
156 | smc->sk.sk_state = SMC_CLOSED; | |
157 | break; | |
158 | case SMC_PEERFINCLOSEWAIT: | |
159 | case SMC_PEERABORTWAIT: | |
160 | case SMC_CLOSED: | |
161 | break; | |
162 | } | |
163 | ||
164 | sock_set_flag(&smc->sk, SOCK_DEAD); | |
b38d7324 UB |
165 | smc->sk.sk_state_change(&smc->sk); |
166 | } | |
167 | ||
a98bf8c0 UB |
168 | static inline bool smc_close_sent_any_close(struct smc_connection *conn) |
169 | { | |
170 | return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort || | |
171 | conn->local_tx_ctrl.conn_state_flags.peer_conn_closed; | |
172 | } | |
173 | ||
b38d7324 UB |
174 | int smc_close_active(struct smc_sock *smc) |
175 | { | |
176 | struct smc_cdc_conn_state_flags *txflags = | |
177 | &smc->conn.local_tx_ctrl.conn_state_flags; | |
b38d7324 UB |
178 | struct smc_connection *conn = &smc->conn; |
179 | struct sock *sk = &smc->sk; | |
180 | int old_state; | |
8c96feee | 181 | long timeout; |
b38d7324 UB |
182 | int rc = 0; |
183 | ||
8c96feee UB |
184 | timeout = current->flags & PF_EXITING ? |
185 | 0 : sock_flag(sk, SOCK_LINGER) ? | |
186 | sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT; | |
b38d7324 UB |
187 | |
188 | again: | |
189 | old_state = sk->sk_state; | |
190 | switch (old_state) { | |
191 | case SMC_INIT: | |
192 | sk->sk_state = SMC_CLOSED; | |
193 | if (smc->smc_listen_work.func) | |
46c28dbd | 194 | cancel_work_sync(&smc->smc_listen_work); |
b38d7324 UB |
195 | break; |
196 | case SMC_LISTEN: | |
197 | sk->sk_state = SMC_CLOSED; | |
198 | sk->sk_state_change(sk); /* wake up accept */ | |
199 | if (smc->clcsock && smc->clcsock->sk) { | |
200 | rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR); | |
201 | /* wake up kernel_accept of smc_tcp_listen_worker */ | |
202 | smc->clcsock->sk->sk_data_ready(smc->clcsock->sk); | |
203 | } | |
204 | release_sock(sk); | |
205 | smc_close_cleanup_listen(sk); | |
46c28dbd | 206 | cancel_work_sync(&smc->smc_listen_work); |
b38d7324 UB |
207 | lock_sock(sk); |
208 | break; | |
209 | case SMC_ACTIVE: | |
210 | smc_close_stream_wait(smc, timeout); | |
211 | release_sock(sk); | |
18e537cd | 212 | cancel_delayed_work_sync(&conn->tx_work); |
b38d7324 UB |
213 | lock_sock(sk); |
214 | if (sk->sk_state == SMC_ACTIVE) { | |
215 | /* send close request */ | |
216 | rc = smc_close_final(conn); | |
217 | sk->sk_state = SMC_PEERCLOSEWAIT1; | |
218 | } else { | |
219 | /* peer event has changed the state */ | |
220 | goto again; | |
221 | } | |
222 | break; | |
223 | case SMC_APPFINCLOSEWAIT: | |
224 | /* socket already shutdown wr or both (active close) */ | |
225 | if (txflags->peer_done_writing && | |
a98bf8c0 | 226 | !smc_close_sent_any_close(conn)) { |
b38d7324 UB |
227 | /* just shutdown wr done, send close request */ |
228 | rc = smc_close_final(conn); | |
229 | } | |
230 | sk->sk_state = SMC_CLOSED; | |
231 | smc_close_wait_tx_pends(smc); | |
232 | break; | |
233 | case SMC_APPCLOSEWAIT1: | |
234 | case SMC_APPCLOSEWAIT2: | |
235 | if (!smc_cdc_rxed_any_close(conn)) | |
236 | smc_close_stream_wait(smc, timeout); | |
237 | release_sock(sk); | |
18e537cd | 238 | cancel_delayed_work_sync(&conn->tx_work); |
b38d7324 UB |
239 | lock_sock(sk); |
240 | if (sk->sk_err != ECONNABORTED) { | |
241 | /* confirm close from peer */ | |
242 | rc = smc_close_final(conn); | |
243 | if (rc) | |
244 | break; | |
245 | } | |
246 | if (smc_cdc_rxed_any_close(conn)) | |
247 | /* peer has closed the socket already */ | |
248 | sk->sk_state = SMC_CLOSED; | |
249 | else | |
250 | /* peer has just issued a shutdown write */ | |
251 | sk->sk_state = SMC_PEERFINCLOSEWAIT; | |
252 | smc_close_wait_tx_pends(smc); | |
253 | break; | |
254 | case SMC_PEERCLOSEWAIT1: | |
255 | case SMC_PEERCLOSEWAIT2: | |
a98bf8c0 UB |
256 | if (txflags->peer_done_writing && |
257 | !smc_close_sent_any_close(conn)) { | |
258 | /* just shutdown wr done, send close request */ | |
259 | rc = smc_close_final(conn); | |
260 | } | |
261 | /* peer sending PeerConnectionClosed will cause transition */ | |
262 | break; | |
b38d7324 UB |
263 | case SMC_PEERFINCLOSEWAIT: |
264 | /* peer sending PeerConnectionClosed will cause transition */ | |
265 | break; | |
266 | case SMC_PROCESSABORT: | |
18e537cd UB |
267 | release_sock(sk); |
268 | cancel_delayed_work_sync(&conn->tx_work); | |
269 | lock_sock(sk); | |
b38d7324 UB |
270 | smc_close_abort(conn); |
271 | sk->sk_state = SMC_CLOSED; | |
272 | smc_close_wait_tx_pends(smc); | |
273 | break; | |
274 | case SMC_PEERABORTWAIT: | |
275 | case SMC_CLOSED: | |
276 | /* nothing to do, add tracing in future patch */ | |
277 | break; | |
278 | } | |
279 | ||
280 | if (old_state != sk->sk_state) | |
281 | sk->sk_state_change(&smc->sk); | |
282 | return rc; | |
283 | } | |
284 | ||
285 | static void smc_close_passive_abort_received(struct smc_sock *smc) | |
286 | { | |
287 | struct smc_cdc_conn_state_flags *txflags = | |
288 | &smc->conn.local_tx_ctrl.conn_state_flags; | |
289 | struct sock *sk = &smc->sk; | |
290 | ||
291 | switch (sk->sk_state) { | |
292 | case SMC_ACTIVE: | |
293 | case SMC_APPFINCLOSEWAIT: | |
294 | case SMC_APPCLOSEWAIT1: | |
295 | case SMC_APPCLOSEWAIT2: | |
296 | smc_close_abort(&smc->conn); | |
297 | sk->sk_state = SMC_PROCESSABORT; | |
298 | break; | |
299 | case SMC_PEERCLOSEWAIT1: | |
300 | case SMC_PEERCLOSEWAIT2: | |
301 | if (txflags->peer_done_writing && | |
a98bf8c0 | 302 | !smc_close_sent_any_close(&smc->conn)) { |
b38d7324 UB |
303 | /* just shutdown, but not yet closed locally */ |
304 | smc_close_abort(&smc->conn); | |
305 | sk->sk_state = SMC_PROCESSABORT; | |
306 | } else { | |
307 | sk->sk_state = SMC_CLOSED; | |
308 | } | |
309 | break; | |
310 | case SMC_PEERFINCLOSEWAIT: | |
311 | case SMC_PEERABORTWAIT: | |
312 | sk->sk_state = SMC_CLOSED; | |
313 | break; | |
314 | case SMC_INIT: | |
315 | case SMC_PROCESSABORT: | |
316 | /* nothing to do, add tracing in future patch */ | |
317 | break; | |
318 | } | |
319 | } | |
320 | ||
321 | /* Some kind of closing has been received: peer_conn_closed, peer_conn_abort, | |
322 | * or peer_done_writing. | |
b38d7324 | 323 | */ |
46c28dbd | 324 | static void smc_close_passive_work(struct work_struct *work) |
b38d7324 | 325 | { |
46c28dbd UB |
326 | struct smc_connection *conn = container_of(work, |
327 | struct smc_connection, | |
328 | close_work); | |
329 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
330 | struct smc_cdc_conn_state_flags *rxflags; | |
b38d7324 UB |
331 | struct sock *sk = &smc->sk; |
332 | int old_state; | |
333 | ||
46c28dbd | 334 | lock_sock(&smc->sk); |
b38d7324 UB |
335 | old_state = sk->sk_state; |
336 | ||
46c28dbd UB |
337 | if (!conn->alert_token_local) { |
338 | /* abnormal termination */ | |
339 | smc_close_active_abort(smc); | |
340 | goto wakeup; | |
341 | } | |
342 | ||
343 | rxflags = &smc->conn.local_rx_ctrl.conn_state_flags; | |
b38d7324 UB |
344 | if (rxflags->peer_conn_abort) { |
345 | smc_close_passive_abort_received(smc); | |
346 | goto wakeup; | |
347 | } | |
348 | ||
349 | switch (sk->sk_state) { | |
350 | case SMC_INIT: | |
351 | if (atomic_read(&smc->conn.bytes_to_rcv) || | |
352 | (rxflags->peer_done_writing && | |
a98bf8c0 | 353 | !smc_cdc_rxed_any_close(conn))) |
b38d7324 UB |
354 | sk->sk_state = SMC_APPCLOSEWAIT1; |
355 | else | |
356 | sk->sk_state = SMC_CLOSED; | |
357 | break; | |
358 | case SMC_ACTIVE: | |
359 | sk->sk_state = SMC_APPCLOSEWAIT1; | |
360 | break; | |
361 | case SMC_PEERCLOSEWAIT1: | |
362 | if (rxflags->peer_done_writing) | |
363 | sk->sk_state = SMC_PEERCLOSEWAIT2; | |
364 | /* fall through to check for closing */ | |
365 | case SMC_PEERCLOSEWAIT2: | |
366 | case SMC_PEERFINCLOSEWAIT: | |
367 | if (!smc_cdc_rxed_any_close(&smc->conn)) | |
368 | break; | |
369 | if (sock_flag(sk, SOCK_DEAD) && | |
a98bf8c0 | 370 | smc_close_sent_any_close(conn)) { |
b38d7324 UB |
371 | /* smc_release has already been called locally */ |
372 | sk->sk_state = SMC_CLOSED; | |
373 | } else { | |
374 | /* just shutdown, but not yet closed locally */ | |
375 | sk->sk_state = SMC_APPFINCLOSEWAIT; | |
376 | } | |
377 | break; | |
378 | case SMC_APPCLOSEWAIT1: | |
379 | case SMC_APPCLOSEWAIT2: | |
380 | case SMC_APPFINCLOSEWAIT: | |
381 | case SMC_PEERABORTWAIT: | |
382 | case SMC_PROCESSABORT: | |
383 | case SMC_CLOSED: | |
384 | /* nothing to do, add tracing in future patch */ | |
385 | break; | |
386 | } | |
387 | ||
388 | wakeup: | |
b38d7324 UB |
389 | sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */ |
390 | sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */ | |
391 | ||
a98bf8c0 UB |
392 | if (old_state != sk->sk_state) { |
393 | sk->sk_state_change(sk); | |
394 | if ((sk->sk_state == SMC_CLOSED) && | |
395 | (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) { | |
396 | smc_conn_free(&smc->conn); | |
397 | schedule_delayed_work(&smc->sock_put_work, | |
398 | SMC_CLOSE_SOCK_PUT_DELAY); | |
399 | } | |
b38d7324 | 400 | } |
46c28dbd | 401 | release_sock(&smc->sk); |
b38d7324 UB |
402 | } |
403 | ||
404 | void smc_close_sock_put_work(struct work_struct *work) | |
405 | { | |
406 | struct smc_sock *smc = container_of(to_delayed_work(work), | |
407 | struct smc_sock, | |
408 | sock_put_work); | |
409 | ||
f16a7dd5 | 410 | smc->sk.sk_prot->unhash(&smc->sk); |
b38d7324 UB |
411 | sock_put(&smc->sk); |
412 | } | |
413 | ||
414 | int smc_close_shutdown_write(struct smc_sock *smc) | |
415 | { | |
416 | struct smc_connection *conn = &smc->conn; | |
b38d7324 UB |
417 | struct sock *sk = &smc->sk; |
418 | int old_state; | |
8c96feee | 419 | long timeout; |
b38d7324 UB |
420 | int rc = 0; |
421 | ||
8c96feee UB |
422 | timeout = current->flags & PF_EXITING ? |
423 | 0 : sock_flag(sk, SOCK_LINGER) ? | |
424 | sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT; | |
b38d7324 UB |
425 | |
426 | again: | |
427 | old_state = sk->sk_state; | |
428 | switch (old_state) { | |
429 | case SMC_ACTIVE: | |
430 | smc_close_stream_wait(smc, timeout); | |
431 | release_sock(sk); | |
18e537cd | 432 | cancel_delayed_work_sync(&conn->tx_work); |
b38d7324 UB |
433 | lock_sock(sk); |
434 | /* send close wr request */ | |
435 | rc = smc_close_wr(conn); | |
436 | if (sk->sk_state == SMC_ACTIVE) | |
437 | sk->sk_state = SMC_PEERCLOSEWAIT1; | |
438 | else | |
439 | goto again; | |
440 | break; | |
441 | case SMC_APPCLOSEWAIT1: | |
442 | /* passive close */ | |
443 | if (!smc_cdc_rxed_any_close(conn)) | |
444 | smc_close_stream_wait(smc, timeout); | |
445 | release_sock(sk); | |
18e537cd | 446 | cancel_delayed_work_sync(&conn->tx_work); |
b38d7324 UB |
447 | lock_sock(sk); |
448 | /* confirm close from peer */ | |
449 | rc = smc_close_wr(conn); | |
450 | sk->sk_state = SMC_APPCLOSEWAIT2; | |
451 | break; | |
452 | case SMC_APPCLOSEWAIT2: | |
453 | case SMC_PEERFINCLOSEWAIT: | |
454 | case SMC_PEERCLOSEWAIT1: | |
455 | case SMC_PEERCLOSEWAIT2: | |
456 | case SMC_APPFINCLOSEWAIT: | |
457 | case SMC_PROCESSABORT: | |
458 | case SMC_PEERABORTWAIT: | |
459 | /* nothing to do, add tracing in future patch */ | |
460 | break; | |
461 | } | |
462 | ||
463 | if (old_state != sk->sk_state) | |
464 | sk->sk_state_change(&smc->sk); | |
465 | return rc; | |
466 | } | |
46c28dbd UB |
467 | |
468 | /* Initialize close properties on connection establishment. */ | |
469 | void smc_close_init(struct smc_sock *smc) | |
470 | { | |
471 | INIT_WORK(&smc->conn.close_work, smc_close_passive_work); | |
472 | } |