1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * Shared Memory Communications over RDMA (SM
4 *
5 * Socket Closing - normal and abnormal
6 *
7 * Copyright IBM Corp. 2016
8 *
9 * Author(s): Ursula Braun <ubraun@linux.vne
10 */
11
12 #include <linux/workqueue.h>
13 #include <linux/sched/signal.h>
14
15 #include <net/sock.h>
16 #include <net/tcp.h>
17
18 #include "smc.h"
19 #include "smc_tx.h"
20 #include "smc_cdc.h"
21 #include "smc_close.h"
22
23 /* release the clcsock that is assigned to the
24 void smc_clcsock_release(struct smc_sock *smc)
25 {
26 struct socket *tcp;
27
28 if (smc->listen_smc && current_work()
29 cancel_work_sync(&smc->smc_lis
30 mutex_lock(&smc->clcsock_release_lock)
31 if (smc->clcsock) {
32 tcp = smc->clcsock;
33 smc->clcsock = NULL;
34 sock_release(tcp);
35 }
36 mutex_unlock(&smc->clcsock_release_loc
37 }
38
39 static void smc_close_cleanup_listen(struct so
40 {
41 struct sock *sk;
42
43 /* Close non-accepted connections */
44 while ((sk = smc_accept_dequeue(parent
45 smc_close_non_accepted(sk);
46 }
47
48 /* wait for sndbuf data being transmitted */
49 static void smc_close_stream_wait(struct smc_s
50 {
51 DEFINE_WAIT_FUNC(wait, woken_wake_func
52 struct sock *sk = &smc->sk;
53
54 if (!timeout)
55 return;
56
57 if (!smc_tx_prepared_sends(&smc->conn)
58 return;
59
60 /* Send out corked data remaining in s
61 smc_tx_pending(&smc->conn);
62
63 smc->wait_close_tx_prepared = 1;
64 add_wait_queue(sk_sleep(sk), &wait);
65 while (!signal_pending(current) && tim
66 int rc;
67
68 rc = sk_wait_event(sk, &timeou
69 !smc_tx_pre
70 READ_ONCE(s
71 READ_ONCE(s
72 smc->conn.k
73 &wait);
74 if (rc)
75 break;
76 }
77 remove_wait_queue(sk_sleep(sk), &wait)
78 smc->wait_close_tx_prepared = 0;
79 }
80
81 void smc_close_wake_tx_prepared(struct smc_soc
82 {
83 if (smc->wait_close_tx_prepared)
84 /* wake up socket closing */
85 smc->sk.sk_state_change(&smc->
86 }
87
88 static int smc_close_wr(struct smc_connection
89 {
90 conn->local_tx_ctrl.conn_state_flags.p
91
92 return smc_cdc_get_slot_and_msg_send(c
93 }
94
95 static int smc_close_final(struct smc_connecti
96 {
97 if (atomic_read(&conn->bytes_to_rcv))
98 conn->local_tx_ctrl.conn_state
99 else
100 conn->local_tx_ctrl.conn_state
101 if (conn->killed)
102 return -EPIPE;
103
104 return smc_cdc_get_slot_and_msg_send(c
105 }
106
107 int smc_close_abort(struct smc_connection *con
108 {
109 conn->local_tx_ctrl.conn_state_flags.p
110
111 return smc_cdc_get_slot_and_msg_send(c
112 }
113
114 static void smc_close_cancel_work(struct smc_s
115 {
116 struct sock *sk = &smc->sk;
117
118 release_sock(sk);
119 if (cancel_work_sync(&smc->conn.close_
120 sock_put(sk);
121 cancel_delayed_work_sync(&smc->conn.tx
122 lock_sock(sk);
123 }
124
125 /* terminate smc socket abnormally - active ab
126 * link group is terminated, i.e. RDMA communi
127 */
128 void smc_close_active_abort(struct smc_sock *s
129 {
130 struct sock *sk = &smc->sk;
131 bool release_clcsock = false;
132
133 if (sk->sk_state != SMC_INIT && smc->c
134 sk->sk_err = ECONNABORTED;
135 if (smc->clcsock && smc->clcso
136 tcp_abort(smc->clcsock
137 }
138 switch (sk->sk_state) {
139 case SMC_ACTIVE:
140 case SMC_APPCLOSEWAIT1:
141 case SMC_APPCLOSEWAIT2:
142 sk->sk_state = SMC_PEERABORTWA
143 smc_close_cancel_work(smc);
144 if (sk->sk_state != SMC_PEERAB
145 break;
146 sk->sk_state = SMC_CLOSED;
147 sock_put(sk); /* (postponed) p
148 break;
149 case SMC_PEERCLOSEWAIT1:
150 case SMC_PEERCLOSEWAIT2:
151 case SMC_PEERFINCLOSEWAIT:
152 sk->sk_state = SMC_PEERABORTWA
153 smc_close_cancel_work(smc);
154 if (sk->sk_state != SMC_PEERAB
155 break;
156 sk->sk_state = SMC_CLOSED;
157 smc_conn_free(&smc->conn);
158 release_clcsock = true;
159 sock_put(sk); /* passive closi
160 break;
161 case SMC_PROCESSABORT:
162 case SMC_APPFINCLOSEWAIT:
163 sk->sk_state = SMC_PEERABORTWA
164 smc_close_cancel_work(smc);
165 if (sk->sk_state != SMC_PEERAB
166 break;
167 sk->sk_state = SMC_CLOSED;
168 smc_conn_free(&smc->conn);
169 release_clcsock = true;
170 break;
171 case SMC_INIT:
172 case SMC_PEERABORTWAIT:
173 case SMC_CLOSED:
174 break;
175 }
176
177 smc_sock_set_flag(sk, SOCK_DEAD);
178 sk->sk_state_change(sk);
179
180 if (release_clcsock) {
181 release_sock(sk);
182 smc_clcsock_release(smc);
183 lock_sock(sk);
184 }
185 }
186
187 static inline bool smc_close_sent_any_close(st
188 {
189 return conn->local_tx_ctrl.conn_state_
190 conn->local_tx_ctrl.conn_state_
191 }
192
193 int smc_close_active(struct smc_sock *smc)
194 {
195 struct smc_cdc_conn_state_flags *txfla
196 &smc->conn.local_tx_ctrl.conn_
197 struct smc_connection *conn = &smc->co
198 struct sock *sk = &smc->sk;
199 int old_state;
200 long timeout;
201 int rc = 0;
202 int rc1 = 0;
203
204 timeout = current->flags & PF_EXITING
205 0 : sock_flag(sk, SOCK_LINGE
206 sk->sk_lingertime : SMC_
207
208 old_state = sk->sk_state;
209 again:
210 switch (sk->sk_state) {
211 case SMC_INIT:
212 sk->sk_state = SMC_CLOSED;
213 break;
214 case SMC_LISTEN:
215 sk->sk_state = SMC_CLOSED;
216 sk->sk_state_change(sk); /* wa
217 if (smc->clcsock && smc->clcso
218 write_lock_bh(&smc->cl
219 smc_clcsock_restore_cb
220
221 smc->clcsock->sk->sk_u
222 write_unlock_bh(&smc->
223 rc = kernel_sock_shutd
224 }
225 smc_close_cleanup_listen(sk);
226 release_sock(sk);
227 flush_work(&smc->tcp_listen_wo
228 lock_sock(sk);
229 break;
230 case SMC_ACTIVE:
231 smc_close_stream_wait(smc, tim
232 release_sock(sk);
233 cancel_delayed_work_sync(&conn
234 lock_sock(sk);
235 if (sk->sk_state == SMC_ACTIVE
236 /* send close request
237 rc = smc_close_final(c
238 sk->sk_state = SMC_PEE
239
240 /* actively shutdown c
241 * prevent peer from e
242 */
243 if (smc->clcsock && sm
244 rc1 = kernel_s
245
246 rc = rc ? rc :
247 }
248 } else {
249 /* peer event has chan
250 goto again;
251 }
252 break;
253 case SMC_APPFINCLOSEWAIT:
254 /* socket already shutdown wr
255 if (txflags->peer_done_writing
256 !smc_close_sent_any_close(
257 /* just shutdown wr do
258 rc = smc_close_final(c
259 }
260 sk->sk_state = SMC_CLOSED;
261 break;
262 case SMC_APPCLOSEWAIT1:
263 case SMC_APPCLOSEWAIT2:
264 if (!smc_cdc_rxed_any_close(co
265 smc_close_stream_wait(
266 release_sock(sk);
267 cancel_delayed_work_sync(&conn
268 lock_sock(sk);
269 if (sk->sk_state != SMC_APPCLO
270 sk->sk_state != SMC_APPCLO
271 goto again;
272 /* confirm close from peer */
273 rc = smc_close_final(conn);
274 if (smc_cdc_rxed_any_close(con
275 /* peer has closed the
276 sk->sk_state = SMC_CLO
277 sock_put(sk); /* postp
278 } else {
279 /* peer has just issue
280 sk->sk_state = SMC_PEE
281 }
282 break;
283 case SMC_PEERCLOSEWAIT1:
284 case SMC_PEERCLOSEWAIT2:
285 if (txflags->peer_done_writing
286 !smc_close_sent_any_close(
287 /* just shutdown wr do
288 rc = smc_close_final(c
289 }
290 /* peer sending PeerConnection
291 break;
292 case SMC_PEERFINCLOSEWAIT:
293 /* peer sending PeerConnection
294 break;
295 case SMC_PROCESSABORT:
296 rc = smc_close_abort(conn);
297 sk->sk_state = SMC_CLOSED;
298 break;
299 case SMC_PEERABORTWAIT:
300 sk->sk_state = SMC_CLOSED;
301 break;
302 case SMC_CLOSED:
303 /* nothing to do, add tracing
304 break;
305 }
306
307 if (old_state != sk->sk_state)
308 sk->sk_state_change(sk);
309 return rc;
310 }
311
312 static void smc_close_passive_abort_received(s
313 {
314 struct smc_cdc_conn_state_flags *txfla
315 &smc->conn.local_tx_ctrl.conn_
316 struct sock *sk = &smc->sk;
317
318 switch (sk->sk_state) {
319 case SMC_INIT:
320 case SMC_ACTIVE:
321 case SMC_APPCLOSEWAIT1:
322 sk->sk_state = SMC_PROCESSABOR
323 sock_put(sk); /* passive closi
324 break;
325 case SMC_APPFINCLOSEWAIT:
326 sk->sk_state = SMC_PROCESSABOR
327 break;
328 case SMC_PEERCLOSEWAIT1:
329 case SMC_PEERCLOSEWAIT2:
330 if (txflags->peer_done_writing
331 !smc_close_sent_any_close(
332 /* just shutdown, but
333 sk->sk_state = SMC_PRO
334 else
335 sk->sk_state = SMC_CLO
336 sock_put(sk); /* passive closi
337 break;
338 case SMC_APPCLOSEWAIT2:
339 case SMC_PEERFINCLOSEWAIT:
340 sk->sk_state = SMC_CLOSED;
341 sock_put(sk); /* passive closi
342 break;
343 case SMC_PEERABORTWAIT:
344 sk->sk_state = SMC_CLOSED;
345 break;
346 case SMC_PROCESSABORT:
347 /* nothing to do, add tracing in futur
348 break;
349 }
350 }
351
352 /* Either some kind of closing has been receiv
353 * peer_conn_abort, or peer_done_writing
354 * or the link group of the connection termina
355 */
356 static void smc_close_passive_work(struct work
357 {
358 struct smc_connection *conn = containe
359
360
361 struct smc_sock *smc = container_of(co
362 struct smc_cdc_conn_state_flags *rxfla
363 bool release_clcsock = false;
364 struct sock *sk = &smc->sk;
365 int old_state;
366
367 lock_sock(sk);
368 old_state = sk->sk_state;
369
370 rxflags = &conn->local_rx_ctrl.conn_st
371 if (rxflags->peer_conn_abort) {
372 /* peer has not received all d
373 smc_close_passive_abort_receiv
374 release_sock(sk);
375 cancel_delayed_work_sync(&conn
376 lock_sock(sk);
377 goto wakeup;
378 }
379
380 switch (sk->sk_state) {
381 case SMC_INIT:
382 sk->sk_state = SMC_APPCLOSEWAI
383 break;
384 case SMC_ACTIVE:
385 sk->sk_state = SMC_APPCLOSEWAI
386 /* postpone sock_put() for pas
387 * received SEND_SHUTDOWN as w
388 */
389 break;
390 case SMC_PEERCLOSEWAIT1:
391 if (rxflags->peer_done_writing
392 sk->sk_state = SMC_PEE
393 fallthrough;
394 /* to check for closing */
395 case SMC_PEERCLOSEWAIT2:
396 if (!smc_cdc_rxed_any_close(co
397 break;
398 if (sock_flag(sk, SOCK_DEAD) &
399 smc_close_sent_any_close(c
400 /* smc_release has alr
401 sk->sk_state = SMC_CLO
402 } else {
403 /* just shutdown, but
404 sk->sk_state = SMC_APP
405 }
406 sock_put(sk); /* passive closi
407 break;
408 case SMC_PEERFINCLOSEWAIT:
409 if (smc_cdc_rxed_any_close(con
410 sk->sk_state = SMC_CLO
411 sock_put(sk); /* passi
412 }
413 break;
414 case SMC_APPCLOSEWAIT1:
415 case SMC_APPCLOSEWAIT2:
416 /* postpone sock_put() for pas
417 * received SEND_SHUTDOWN as w
418 */
419 break;
420 case SMC_APPFINCLOSEWAIT:
421 case SMC_PEERABORTWAIT:
422 case SMC_PROCESSABORT:
423 case SMC_CLOSED:
424 /* nothing to do, add tracing
425 break;
426 }
427
428 wakeup:
429 sk->sk_data_ready(sk); /* wakeup block
430 sk->sk_write_space(sk); /* wakeup bloc
431
432 if (old_state != sk->sk_state) {
433 sk->sk_state_change(sk);
434 if ((sk->sk_state == SMC_CLOSE
435 (sock_flag(sk, SOCK_DEAD)
436 smc_conn_free(conn);
437 if (smc->clcsock)
438 release_clcsoc
439 }
440 }
441 release_sock(sk);
442 if (release_clcsock)
443 smc_clcsock_release(smc);
444 sock_put(sk); /* sock_hold done by sch
445 }
446
447 int smc_close_shutdown_write(struct smc_sock *
448 {
449 struct smc_connection *conn = &smc->co
450 struct sock *sk = &smc->sk;
451 int old_state;
452 long timeout;
453 int rc = 0;
454
455 timeout = current->flags & PF_EXITING
456 0 : sock_flag(sk, SOCK_LINGE
457 sk->sk_lingertime : SMC_
458
459 old_state = sk->sk_state;
460 again:
461 switch (sk->sk_state) {
462 case SMC_ACTIVE:
463 smc_close_stream_wait(smc, tim
464 release_sock(sk);
465 cancel_delayed_work_sync(&conn
466 lock_sock(sk);
467 if (sk->sk_state != SMC_ACTIVE
468 goto again;
469 /* send close wr request */
470 rc = smc_close_wr(conn);
471 sk->sk_state = SMC_PEERCLOSEWA
472 break;
473 case SMC_APPCLOSEWAIT1:
474 /* passive close */
475 if (!smc_cdc_rxed_any_close(co
476 smc_close_stream_wait(
477 release_sock(sk);
478 cancel_delayed_work_sync(&conn
479 lock_sock(sk);
480 if (sk->sk_state != SMC_APPCLO
481 goto again;
482 /* confirm close from peer */
483 rc = smc_close_wr(conn);
484 sk->sk_state = SMC_APPCLOSEWAI
485 break;
486 case SMC_APPCLOSEWAIT2:
487 case SMC_PEERFINCLOSEWAIT:
488 case SMC_PEERCLOSEWAIT1:
489 case SMC_PEERCLOSEWAIT2:
490 case SMC_APPFINCLOSEWAIT:
491 case SMC_PROCESSABORT:
492 case SMC_PEERABORTWAIT:
493 /* nothing to do, add tracing
494 break;
495 }
496
497 if (old_state != sk->sk_state)
498 sk->sk_state_change(sk);
499 return rc;
500 }
501
502 /* Initialize close properties on connection e
503 void smc_close_init(struct smc_sock *smc)
504 {
505 INIT_WORK(&smc->conn.close_work, smc_c
506 }
507
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