1 // SPDX-License-Identifier: GPL-2.0
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
5 * Socket Closing - normal and abnormal
7 * Copyright IBM Corp. 2016
9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
12 #include <linux/workqueue.h>
13 #include <linux/sched/signal.h>
20 #include "smc_close.h"
22 #define SMC_CLOSE_WAIT_LISTEN_CLCSOCK_TIME (5 * HZ)
24 static void smc_close_cleanup_listen(struct sock *parent)
28 /* Close non-accepted connections */
29 while ((sk = smc_accept_dequeue(parent, NULL)))
30 smc_close_non_accepted(sk);
33 static void smc_close_wait_listen_clcsock(struct smc_sock *smc)
35 DEFINE_WAIT_FUNC(wait, woken_wake_function);
36 struct sock *sk = &smc->sk;
39 timeout = SMC_CLOSE_WAIT_LISTEN_CLCSOCK_TIME;
40 add_wait_queue(sk_sleep(sk), &wait);
44 timeout = wait_woken(&wait, TASK_UNINTERRUPTIBLE,
46 sched_annotate_sleep();
51 remove_wait_queue(sk_sleep(sk), &wait);
54 /* wait for sndbuf data being transmitted */
55 static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
57 DEFINE_WAIT_FUNC(wait, woken_wake_function);
58 struct sock *sk = &smc->sk;
63 if (!smc_tx_prepared_sends(&smc->conn))
66 smc->wait_close_tx_prepared = 1;
67 add_wait_queue(sk_sleep(sk), &wait);
68 while (!signal_pending(current) && timeout) {
71 rc = sk_wait_event(sk, &timeout,
72 !smc_tx_prepared_sends(&smc->conn) ||
73 (sk->sk_err == ECONNABORTED) ||
74 (sk->sk_err == ECONNRESET),
79 remove_wait_queue(sk_sleep(sk), &wait);
80 smc->wait_close_tx_prepared = 0;
83 void smc_close_wake_tx_prepared(struct smc_sock *smc)
85 if (smc->wait_close_tx_prepared)
86 /* wake up socket closing */
87 smc->sk.sk_state_change(&smc->sk);
90 static int smc_close_wr(struct smc_connection *conn)
92 conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
94 return smc_cdc_get_slot_and_msg_send(conn);
97 static int smc_close_final(struct smc_connection *conn)
99 if (atomic_read(&conn->bytes_to_rcv))
100 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
102 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
104 return smc_cdc_get_slot_and_msg_send(conn);
107 static int smc_close_abort(struct smc_connection *conn)
109 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
111 return smc_cdc_get_slot_and_msg_send(conn);
114 /* terminate smc socket abnormally - active abort
115 * link group is terminated, i.e. RDMA communication no longer possible
117 static void smc_close_active_abort(struct smc_sock *smc)
119 struct sock *sk = &smc->sk;
121 struct smc_cdc_conn_state_flags *txflags =
122 &smc->conn.local_tx_ctrl.conn_state_flags;
124 sk->sk_err = ECONNABORTED;
125 if (smc->clcsock && smc->clcsock->sk) {
126 smc->clcsock->sk->sk_err = ECONNABORTED;
127 smc->clcsock->sk->sk_state_change(smc->clcsock->sk);
129 switch (sk->sk_state) {
132 sk->sk_state = SMC_PEERABORTWAIT;
134 cancel_delayed_work_sync(&smc->conn.tx_work);
136 sock_put(sk); /* passive closing */
138 case SMC_APPCLOSEWAIT1:
139 case SMC_APPCLOSEWAIT2:
140 if (!smc_cdc_rxed_any_close(&smc->conn))
141 sk->sk_state = SMC_PEERABORTWAIT;
143 sk->sk_state = SMC_CLOSED;
145 cancel_delayed_work_sync(&smc->conn.tx_work);
148 case SMC_PEERCLOSEWAIT1:
149 case SMC_PEERCLOSEWAIT2:
150 if (!txflags->peer_conn_closed) {
151 /* just SHUTDOWN_SEND done */
152 sk->sk_state = SMC_PEERABORTWAIT;
154 sk->sk_state = SMC_CLOSED;
156 sock_put(sk); /* passive closing */
158 case SMC_PROCESSABORT:
159 case SMC_APPFINCLOSEWAIT:
160 sk->sk_state = SMC_CLOSED;
162 case SMC_PEERFINCLOSEWAIT:
163 sock_put(sk); /* passive closing */
165 case SMC_PEERABORTWAIT:
170 sock_set_flag(sk, SOCK_DEAD);
171 sk->sk_state_change(sk);
174 static inline bool smc_close_sent_any_close(struct smc_connection *conn)
176 return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
177 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
180 int smc_close_active(struct smc_sock *smc)
182 struct smc_cdc_conn_state_flags *txflags =
183 &smc->conn.local_tx_ctrl.conn_state_flags;
184 struct smc_connection *conn = &smc->conn;
185 struct sock *sk = &smc->sk;
190 timeout = current->flags & PF_EXITING ?
191 0 : sock_flag(sk, SOCK_LINGER) ?
192 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
194 old_state = sk->sk_state;
196 switch (sk->sk_state) {
198 sk->sk_state = SMC_CLOSED;
201 sk->sk_state = SMC_CLOSED;
202 sk->sk_state_change(sk); /* wake up accept */
203 if (smc->clcsock && smc->clcsock->sk) {
204 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
205 /* wake up kernel_accept of smc_tcp_listen_worker */
206 smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
207 smc_close_wait_listen_clcsock(smc);
209 smc_close_cleanup_listen(sk);
212 smc_close_stream_wait(smc, timeout);
214 cancel_delayed_work_sync(&conn->tx_work);
216 if (sk->sk_state == SMC_ACTIVE) {
217 /* send close request */
218 rc = smc_close_final(conn);
221 sk->sk_state = SMC_PEERCLOSEWAIT1;
223 /* peer event has changed the state */
227 case SMC_APPFINCLOSEWAIT:
228 /* socket already shutdown wr or both (active close) */
229 if (txflags->peer_done_writing &&
230 !smc_close_sent_any_close(conn)) {
231 /* just shutdown wr done, send close request */
232 rc = smc_close_final(conn);
236 sk->sk_state = SMC_CLOSED;
238 case SMC_APPCLOSEWAIT1:
239 case SMC_APPCLOSEWAIT2:
240 if (!smc_cdc_rxed_any_close(conn))
241 smc_close_stream_wait(smc, timeout);
243 cancel_delayed_work_sync(&conn->tx_work);
245 if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
246 sk->sk_state != SMC_APPCLOSEWAIT2)
248 /* confirm close from peer */
249 rc = smc_close_final(conn);
252 if (smc_cdc_rxed_any_close(conn)) {
253 /* peer has closed the socket already */
254 sk->sk_state = SMC_CLOSED;
255 sock_put(sk); /* postponed passive closing */
257 /* peer has just issued a shutdown write */
258 sk->sk_state = SMC_PEERFINCLOSEWAIT;
261 case SMC_PEERCLOSEWAIT1:
262 case SMC_PEERCLOSEWAIT2:
263 if (txflags->peer_done_writing &&
264 !smc_close_sent_any_close(conn)) {
265 /* just shutdown wr done, send close request */
266 rc = smc_close_final(conn);
270 /* peer sending PeerConnectionClosed will cause transition */
272 case SMC_PEERFINCLOSEWAIT:
273 /* peer sending PeerConnectionClosed will cause transition */
275 case SMC_PROCESSABORT:
276 smc_close_abort(conn);
277 sk->sk_state = SMC_CLOSED;
279 case SMC_PEERABORTWAIT:
281 /* nothing to do, add tracing in future patch */
285 if (old_state != sk->sk_state)
286 sk->sk_state_change(sk);
290 static void smc_close_passive_abort_received(struct smc_sock *smc)
292 struct smc_cdc_conn_state_flags *txflags =
293 &smc->conn.local_tx_ctrl.conn_state_flags;
294 struct sock *sk = &smc->sk;
296 switch (sk->sk_state) {
299 case SMC_APPCLOSEWAIT1:
300 sk->sk_state = SMC_PROCESSABORT;
301 sock_put(sk); /* passive closing */
303 case SMC_APPFINCLOSEWAIT:
304 sk->sk_state = SMC_PROCESSABORT;
306 case SMC_PEERCLOSEWAIT1:
307 case SMC_PEERCLOSEWAIT2:
308 if (txflags->peer_done_writing &&
309 !smc_close_sent_any_close(&smc->conn))
310 /* just shutdown, but not yet closed locally */
311 sk->sk_state = SMC_PROCESSABORT;
313 sk->sk_state = SMC_CLOSED;
314 sock_put(sk); /* passive closing */
316 case SMC_APPCLOSEWAIT2:
317 case SMC_PEERFINCLOSEWAIT:
318 sk->sk_state = SMC_CLOSED;
319 sock_put(sk); /* passive closing */
321 case SMC_PEERABORTWAIT:
322 sk->sk_state = SMC_CLOSED;
324 case SMC_PROCESSABORT:
325 /* nothing to do, add tracing in future patch */
330 /* Either some kind of closing has been received: peer_conn_closed,
331 * peer_conn_abort, or peer_done_writing
332 * or the link group of the connection terminates abnormally.
334 static void smc_close_passive_work(struct work_struct *work)
336 struct smc_connection *conn = container_of(work,
337 struct smc_connection,
339 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
340 struct smc_cdc_conn_state_flags *rxflags;
341 struct sock *sk = &smc->sk;
345 old_state = sk->sk_state;
347 if (!conn->alert_token_local) {
348 /* abnormal termination */
349 smc_close_active_abort(smc);
353 rxflags = &conn->local_rx_ctrl.conn_state_flags;
354 if (rxflags->peer_conn_abort) {
355 /* peer has not received all data */
356 smc_close_passive_abort_received(smc);
357 release_sock(&smc->sk);
358 cancel_delayed_work_sync(&conn->tx_work);
363 switch (sk->sk_state) {
365 if (atomic_read(&conn->bytes_to_rcv) ||
366 (rxflags->peer_done_writing &&
367 !smc_cdc_rxed_any_close(conn))) {
368 sk->sk_state = SMC_APPCLOSEWAIT1;
370 sk->sk_state = SMC_CLOSED;
371 sock_put(sk); /* passive closing */
375 sk->sk_state = SMC_APPCLOSEWAIT1;
376 /* postpone sock_put() for passive closing to cover
377 * received SEND_SHUTDOWN as well
380 case SMC_PEERCLOSEWAIT1:
381 if (rxflags->peer_done_writing)
382 sk->sk_state = SMC_PEERCLOSEWAIT2;
384 /* to check for closing */
385 case SMC_PEERCLOSEWAIT2:
386 if (!smc_cdc_rxed_any_close(conn))
388 if (sock_flag(sk, SOCK_DEAD) &&
389 smc_close_sent_any_close(conn)) {
390 /* smc_release has already been called locally */
391 sk->sk_state = SMC_CLOSED;
393 /* just shutdown, but not yet closed locally */
394 sk->sk_state = SMC_APPFINCLOSEWAIT;
396 sock_put(sk); /* passive closing */
398 case SMC_PEERFINCLOSEWAIT:
399 if (smc_cdc_rxed_any_close(conn)) {
400 sk->sk_state = SMC_CLOSED;
401 sock_put(sk); /* passive closing */
404 case SMC_APPCLOSEWAIT1:
405 case SMC_APPCLOSEWAIT2:
406 /* postpone sock_put() for passive closing to cover
407 * received SEND_SHUTDOWN as well
410 case SMC_APPFINCLOSEWAIT:
411 case SMC_PEERABORTWAIT:
412 case SMC_PROCESSABORT:
414 /* nothing to do, add tracing in future patch */
419 sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
420 sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
422 if (old_state != sk->sk_state) {
423 sk->sk_state_change(sk);
424 if ((sk->sk_state == SMC_CLOSED) &&
425 (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket))
429 sock_put(sk); /* sock_hold done by schedulers of close_work */
432 int smc_close_shutdown_write(struct smc_sock *smc)
434 struct smc_connection *conn = &smc->conn;
435 struct sock *sk = &smc->sk;
440 timeout = current->flags & PF_EXITING ?
441 0 : sock_flag(sk, SOCK_LINGER) ?
442 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
444 old_state = sk->sk_state;
446 switch (sk->sk_state) {
448 smc_close_stream_wait(smc, timeout);
450 cancel_delayed_work_sync(&conn->tx_work);
452 if (sk->sk_state != SMC_ACTIVE)
454 /* send close wr request */
455 rc = smc_close_wr(conn);
458 sk->sk_state = SMC_PEERCLOSEWAIT1;
460 case SMC_APPCLOSEWAIT1:
462 if (!smc_cdc_rxed_any_close(conn))
463 smc_close_stream_wait(smc, timeout);
465 cancel_delayed_work_sync(&conn->tx_work);
467 if (sk->sk_state != SMC_APPCLOSEWAIT1)
469 /* confirm close from peer */
470 rc = smc_close_wr(conn);
473 sk->sk_state = SMC_APPCLOSEWAIT2;
475 case SMC_APPCLOSEWAIT2:
476 case SMC_PEERFINCLOSEWAIT:
477 case SMC_PEERCLOSEWAIT1:
478 case SMC_PEERCLOSEWAIT2:
479 case SMC_APPFINCLOSEWAIT:
480 case SMC_PROCESSABORT:
481 case SMC_PEERABORTWAIT:
482 /* nothing to do, add tracing in future patch */
486 if (old_state != sk->sk_state)
487 sk->sk_state_change(sk);
491 /* Initialize close properties on connection establishment. */
492 void smc_close_init(struct smc_sock *smc)
494 INIT_WORK(&smc->conn.close_work, smc_close_passive_work);