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1// SPDX-License-Identifier: GPL-2.0
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>
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 smc_sock */
24void smc_clcsock_release(struct smc_sock *smc)
25{
26 struct socket *tcp;
27
28 if (smc->listen_smc && current_work() != &smc->smc_listen_work)
29 cancel_work_sync(&smc->smc_listen_work);
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_lock);
37}
38
39static void smc_close_cleanup_listen(struct sock *parent)
40{
41 struct sock *sk;
42
43 /* Close non-accepted connections */
44 while ((sk = smc_accept_dequeue(parent, NULL)))
45 smc_close_non_accepted(sk);
46}
47
48/* wait for sndbuf data being transmitted */
49static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
50{
51 DEFINE_WAIT_FUNC(wait, woken_wake_function);
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 sndbuf */
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) && timeout) {
66 int rc;
67
68 rc = sk_wait_event(sk, &timeout,
69 !smc_tx_prepared_sends(&smc->conn) ||
70 READ_ONCE(sk->sk_err) == ECONNABORTED ||
71 READ_ONCE(sk->sk_err) == ECONNRESET ||
72 smc->conn.killed,
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
81void smc_close_wake_tx_prepared(struct smc_sock *smc)
82{
83 if (smc->wait_close_tx_prepared)
84 /* wake up socket closing */
85 smc->sk.sk_state_change(&smc->sk);
86}
87
88static int smc_close_wr(struct smc_connection *conn)
89{
90 conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
91
92 return smc_cdc_get_slot_and_msg_send(conn);
93}
94
95static int smc_close_final(struct smc_connection *conn)
96{
97 if (atomic_read(&conn->bytes_to_rcv))
98 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
99 else
100 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
101 if (conn->killed)
102 return -EPIPE;
103
104 return smc_cdc_get_slot_and_msg_send(conn);
105}
106
107int smc_close_abort(struct smc_connection *conn)
108{
109 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
110
111 return smc_cdc_get_slot_and_msg_send(conn);
112}
113
114static void smc_close_cancel_work(struct smc_sock *smc)
115{
116 struct sock *sk = &smc->sk;
117
118 release_sock(sk);
119 if (cancel_work_sync(&smc->conn.close_work))
120 sock_put(sk);
121 cancel_delayed_work_sync(&smc->conn.tx_work);
122 lock_sock(sk);
123}
124
125/* terminate smc socket abnormally - active abort
126 * link group is terminated, i.e. RDMA communication no longer possible
127 */
128void smc_close_active_abort(struct smc_sock *smc)
129{
130 struct sock *sk = &smc->sk;
131 bool release_clcsock = false;
132
133 if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) {
134 sk->sk_err = ECONNABORTED;
135 if (smc->clcsock && smc->clcsock->sk)
136 tcp_abort(smc->clcsock->sk, ECONNABORTED);
137 }
138 switch (sk->sk_state) {
139 case SMC_ACTIVE:
140 case SMC_APPCLOSEWAIT1:
141 case SMC_APPCLOSEWAIT2:
142 sk->sk_state = SMC_PEERABORTWAIT;
143 smc_close_cancel_work(smc);
144 if (sk->sk_state != SMC_PEERABORTWAIT)
145 break;
146 sk->sk_state = SMC_CLOSED;
147 sock_put(sk); /* (postponed) passive closing */
148 break;
149 case SMC_PEERCLOSEWAIT1:
150 case SMC_PEERCLOSEWAIT2:
151 case SMC_PEERFINCLOSEWAIT:
152 sk->sk_state = SMC_PEERABORTWAIT;
153 smc_close_cancel_work(smc);
154 if (sk->sk_state != SMC_PEERABORTWAIT)
155 break;
156 sk->sk_state = SMC_CLOSED;
157 smc_conn_free(&smc->conn);
158 release_clcsock = true;
159 sock_put(sk); /* passive closing */
160 break;
161 case SMC_PROCESSABORT:
162 case SMC_APPFINCLOSEWAIT:
163 sk->sk_state = SMC_PEERABORTWAIT;
164 smc_close_cancel_work(smc);
165 if (sk->sk_state != SMC_PEERABORTWAIT)
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
187static inline bool smc_close_sent_any_close(struct smc_connection *conn)
188{
189 return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
190 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
191}
192
193int smc_close_active(struct smc_sock *smc)
194{
195 struct smc_cdc_conn_state_flags *txflags =
196 &smc->conn.local_tx_ctrl.conn_state_flags;
197 struct smc_connection *conn = &smc->conn;
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_LINGER) ?
206 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
207
208 old_state = sk->sk_state;
209again:
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); /* wake up accept */
217 if (smc->clcsock && smc->clcsock->sk) {
218 write_lock_bh(&smc->clcsock->sk->sk_callback_lock);
219 smc_clcsock_restore_cb(&smc->clcsock->sk->sk_data_ready,
220 &smc->clcsk_data_ready);
221 smc->clcsock->sk->sk_user_data = NULL;
222 write_unlock_bh(&smc->clcsock->sk->sk_callback_lock);
223 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
224 }
225 smc_close_cleanup_listen(sk);
226 release_sock(sk);
227 flush_work(&smc->tcp_listen_work);
228 lock_sock(sk);
229 break;
230 case SMC_ACTIVE:
231 smc_close_stream_wait(smc, timeout);
232 release_sock(sk);
233 cancel_delayed_work_sync(&conn->tx_work);
234 lock_sock(sk);
235 if (sk->sk_state == SMC_ACTIVE) {
236 /* send close request */
237 rc = smc_close_final(conn);
238 sk->sk_state = SMC_PEERCLOSEWAIT1;
239
240 /* actively shutdown clcsock before peer close it,
241 * prevent peer from entering TIME_WAIT state.
242 */
243 if (smc->clcsock && smc->clcsock->sk) {
244 rc1 = kernel_sock_shutdown(smc->clcsock,
245 SHUT_RDWR);
246 rc = rc ? rc : rc1;
247 }
248 } else {
249 /* peer event has changed the state */
250 goto again;
251 }
252 break;
253 case SMC_APPFINCLOSEWAIT:
254 /* socket already shutdown wr or both (active close) */
255 if (txflags->peer_done_writing &&
256 !smc_close_sent_any_close(conn)) {
257 /* just shutdown wr done, send close request */
258 rc = smc_close_final(conn);
259 }
260 sk->sk_state = SMC_CLOSED;
261 break;
262 case SMC_APPCLOSEWAIT1:
263 case SMC_APPCLOSEWAIT2:
264 if (!smc_cdc_rxed_any_close(conn))
265 smc_close_stream_wait(smc, timeout);
266 release_sock(sk);
267 cancel_delayed_work_sync(&conn->tx_work);
268 lock_sock(sk);
269 if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
270 sk->sk_state != SMC_APPCLOSEWAIT2)
271 goto again;
272 /* confirm close from peer */
273 rc = smc_close_final(conn);
274 if (smc_cdc_rxed_any_close(conn)) {
275 /* peer has closed the socket already */
276 sk->sk_state = SMC_CLOSED;
277 sock_put(sk); /* postponed passive closing */
278 } else {
279 /* peer has just issued a shutdown write */
280 sk->sk_state = SMC_PEERFINCLOSEWAIT;
281 }
282 break;
283 case SMC_PEERCLOSEWAIT1:
284 case SMC_PEERCLOSEWAIT2:
285 if (txflags->peer_done_writing &&
286 !smc_close_sent_any_close(conn)) {
287 /* just shutdown wr done, send close request */
288 rc = smc_close_final(conn);
289 }
290 /* peer sending PeerConnectionClosed will cause transition */
291 break;
292 case SMC_PEERFINCLOSEWAIT:
293 /* peer sending PeerConnectionClosed will cause transition */
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 in future patch */
304 break;
305 }
306
307 if (old_state != sk->sk_state)
308 sk->sk_state_change(sk);
309 return rc;
310}
311
312static void smc_close_passive_abort_received(struct smc_sock *smc)
313{
314 struct smc_cdc_conn_state_flags *txflags =
315 &smc->conn.local_tx_ctrl.conn_state_flags;
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_PROCESSABORT;
323 sock_put(sk); /* passive closing */
324 break;
325 case SMC_APPFINCLOSEWAIT:
326 sk->sk_state = SMC_PROCESSABORT;
327 break;
328 case SMC_PEERCLOSEWAIT1:
329 case SMC_PEERCLOSEWAIT2:
330 if (txflags->peer_done_writing &&
331 !smc_close_sent_any_close(&smc->conn))
332 /* just shutdown, but not yet closed locally */
333 sk->sk_state = SMC_PROCESSABORT;
334 else
335 sk->sk_state = SMC_CLOSED;
336 sock_put(sk); /* passive closing */
337 break;
338 case SMC_APPCLOSEWAIT2:
339 case SMC_PEERFINCLOSEWAIT:
340 sk->sk_state = SMC_CLOSED;
341 sock_put(sk); /* passive closing */
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 future patch */
348 break;
349 }
350}
351
352/* Either some kind of closing has been received: peer_conn_closed,
353 * peer_conn_abort, or peer_done_writing
354 * or the link group of the connection terminates abnormally.
355 */
356static void smc_close_passive_work(struct work_struct *work)
357{
358 struct smc_connection *conn = container_of(work,
359 struct smc_connection,
360 close_work);
361 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
362 struct smc_cdc_conn_state_flags *rxflags;
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_state_flags;
371 if (rxflags->peer_conn_abort) {
372 /* peer has not received all data */
373 smc_close_passive_abort_received(smc);
374 release_sock(sk);
375 cancel_delayed_work_sync(&conn->tx_work);
376 lock_sock(sk);
377 goto wakeup;
378 }
379
380 switch (sk->sk_state) {
381 case SMC_INIT:
382 sk->sk_state = SMC_APPCLOSEWAIT1;
383 break;
384 case SMC_ACTIVE:
385 sk->sk_state = SMC_APPCLOSEWAIT1;
386 /* postpone sock_put() for passive closing to cover
387 * received SEND_SHUTDOWN as well
388 */
389 break;
390 case SMC_PEERCLOSEWAIT1:
391 if (rxflags->peer_done_writing)
392 sk->sk_state = SMC_PEERCLOSEWAIT2;
393 fallthrough;
394 /* to check for closing */
395 case SMC_PEERCLOSEWAIT2:
396 if (!smc_cdc_rxed_any_close(conn))
397 break;
398 if (sock_flag(sk, SOCK_DEAD) &&
399 smc_close_sent_any_close(conn)) {
400 /* smc_release has already been called locally */
401 sk->sk_state = SMC_CLOSED;
402 } else {
403 /* just shutdown, but not yet closed locally */
404 sk->sk_state = SMC_APPFINCLOSEWAIT;
405 }
406 sock_put(sk); /* passive closing */
407 break;
408 case SMC_PEERFINCLOSEWAIT:
409 if (smc_cdc_rxed_any_close(conn)) {
410 sk->sk_state = SMC_CLOSED;
411 sock_put(sk); /* passive closing */
412 }
413 break;
414 case SMC_APPCLOSEWAIT1:
415 case SMC_APPCLOSEWAIT2:
416 /* postpone sock_put() for passive closing to cover
417 * received SEND_SHUTDOWN as well
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 in future patch */
425 break;
426 }
427
428wakeup:
429 sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
430 sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
431
432 if (old_state != sk->sk_state) {
433 sk->sk_state_change(sk);
434 if ((sk->sk_state == SMC_CLOSED) &&
435 (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
436 smc_conn_free(conn);
437 if (smc->clcsock)
438 release_clcsock = true;
439 }
440 }
441 release_sock(sk);
442 if (release_clcsock)
443 smc_clcsock_release(smc);
444 sock_put(sk); /* sock_hold done by schedulers of close_work */
445}
446
447int smc_close_shutdown_write(struct smc_sock *smc)
448{
449 struct smc_connection *conn = &smc->conn;
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_LINGER) ?
457 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
458
459 old_state = sk->sk_state;
460again:
461 switch (sk->sk_state) {
462 case SMC_ACTIVE:
463 smc_close_stream_wait(smc, timeout);
464 release_sock(sk);
465 cancel_delayed_work_sync(&conn->tx_work);
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_PEERCLOSEWAIT1;
472 break;
473 case SMC_APPCLOSEWAIT1:
474 /* passive close */
475 if (!smc_cdc_rxed_any_close(conn))
476 smc_close_stream_wait(smc, timeout);
477 release_sock(sk);
478 cancel_delayed_work_sync(&conn->tx_work);
479 lock_sock(sk);
480 if (sk->sk_state != SMC_APPCLOSEWAIT1)
481 goto again;
482 /* confirm close from peer */
483 rc = smc_close_wr(conn);
484 sk->sk_state = SMC_APPCLOSEWAIT2;
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 in future patch */
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 establishment. */
503void smc_close_init(struct smc_sock *smc)
504{
505 INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
506}
1// SPDX-License-Identifier: GPL-2.0
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>
13#include <linux/sched/signal.h>
14
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_LISTEN_CLCSOCK_TIME (5 * HZ)
23
24static 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/* wait for sndbuf data being transmitted */
34static void smc_close_stream_wait(struct smc_sock *smc, long timeout)
35{
36 DEFINE_WAIT_FUNC(wait, woken_wake_function);
37 struct sock *sk = &smc->sk;
38
39 if (!timeout)
40 return;
41
42 if (!smc_tx_prepared_sends(&smc->conn))
43 return;
44
45 smc->wait_close_tx_prepared = 1;
46 add_wait_queue(sk_sleep(sk), &wait);
47 while (!signal_pending(current) && timeout) {
48 int rc;
49
50 rc = sk_wait_event(sk, &timeout,
51 !smc_tx_prepared_sends(&smc->conn) ||
52 (sk->sk_err == ECONNABORTED) ||
53 (sk->sk_err == ECONNRESET),
54 &wait);
55 if (rc)
56 break;
57 }
58 remove_wait_queue(sk_sleep(sk), &wait);
59 smc->wait_close_tx_prepared = 0;
60}
61
62void smc_close_wake_tx_prepared(struct smc_sock *smc)
63{
64 if (smc->wait_close_tx_prepared)
65 /* wake up socket closing */
66 smc->sk.sk_state_change(&smc->sk);
67}
68
69static int smc_close_wr(struct smc_connection *conn)
70{
71 conn->local_tx_ctrl.conn_state_flags.peer_done_writing = 1;
72
73 return smc_cdc_get_slot_and_msg_send(conn);
74}
75
76static int smc_close_final(struct smc_connection *conn)
77{
78 if (atomic_read(&conn->bytes_to_rcv))
79 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
80 else
81 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed = 1;
82
83 return smc_cdc_get_slot_and_msg_send(conn);
84}
85
86static int smc_close_abort(struct smc_connection *conn)
87{
88 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
89
90 return smc_cdc_get_slot_and_msg_send(conn);
91}
92
93/* terminate smc socket abnormally - active abort
94 * link group is terminated, i.e. RDMA communication no longer possible
95 */
96static void smc_close_active_abort(struct smc_sock *smc)
97{
98 struct sock *sk = &smc->sk;
99
100 struct smc_cdc_conn_state_flags *txflags =
101 &smc->conn.local_tx_ctrl.conn_state_flags;
102
103 sk->sk_err = ECONNABORTED;
104 if (smc->clcsock && smc->clcsock->sk) {
105 smc->clcsock->sk->sk_err = ECONNABORTED;
106 smc->clcsock->sk->sk_state_change(smc->clcsock->sk);
107 }
108 switch (sk->sk_state) {
109 case SMC_INIT:
110 case SMC_ACTIVE:
111 sk->sk_state = SMC_PEERABORTWAIT;
112 release_sock(sk);
113 cancel_delayed_work_sync(&smc->conn.tx_work);
114 lock_sock(sk);
115 sock_put(sk); /* passive closing */
116 break;
117 case SMC_APPCLOSEWAIT1:
118 case SMC_APPCLOSEWAIT2:
119 if (!smc_cdc_rxed_any_close(&smc->conn))
120 sk->sk_state = SMC_PEERABORTWAIT;
121 else
122 sk->sk_state = SMC_CLOSED;
123 release_sock(sk);
124 cancel_delayed_work_sync(&smc->conn.tx_work);
125 lock_sock(sk);
126 break;
127 case SMC_PEERCLOSEWAIT1:
128 case SMC_PEERCLOSEWAIT2:
129 if (!txflags->peer_conn_closed) {
130 /* just SHUTDOWN_SEND done */
131 sk->sk_state = SMC_PEERABORTWAIT;
132 } else {
133 sk->sk_state = SMC_CLOSED;
134 }
135 sock_put(sk); /* passive closing */
136 break;
137 case SMC_PROCESSABORT:
138 case SMC_APPFINCLOSEWAIT:
139 sk->sk_state = SMC_CLOSED;
140 break;
141 case SMC_PEERFINCLOSEWAIT:
142 sock_put(sk); /* passive closing */
143 break;
144 case SMC_PEERABORTWAIT:
145 case SMC_CLOSED:
146 break;
147 }
148
149 sock_set_flag(sk, SOCK_DEAD);
150 sk->sk_state_change(sk);
151}
152
153static inline bool smc_close_sent_any_close(struct smc_connection *conn)
154{
155 return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
156 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
157}
158
159int smc_close_active(struct smc_sock *smc)
160{
161 struct smc_cdc_conn_state_flags *txflags =
162 &smc->conn.local_tx_ctrl.conn_state_flags;
163 struct smc_connection *conn = &smc->conn;
164 struct sock *sk = &smc->sk;
165 int old_state;
166 long timeout;
167 int rc = 0;
168
169 timeout = current->flags & PF_EXITING ?
170 0 : sock_flag(sk, SOCK_LINGER) ?
171 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
172
173 old_state = sk->sk_state;
174again:
175 switch (sk->sk_state) {
176 case SMC_INIT:
177 sk->sk_state = SMC_CLOSED;
178 break;
179 case SMC_LISTEN:
180 sk->sk_state = SMC_CLOSED;
181 sk->sk_state_change(sk); /* wake up accept */
182 if (smc->clcsock && smc->clcsock->sk) {
183 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
184 /* wake up kernel_accept of smc_tcp_listen_worker */
185 smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
186 }
187 smc_close_cleanup_listen(sk);
188 release_sock(sk);
189 flush_work(&smc->tcp_listen_work);
190 lock_sock(sk);
191 break;
192 case SMC_ACTIVE:
193 smc_close_stream_wait(smc, timeout);
194 release_sock(sk);
195 cancel_delayed_work_sync(&conn->tx_work);
196 lock_sock(sk);
197 if (sk->sk_state == SMC_ACTIVE) {
198 /* send close request */
199 rc = smc_close_final(conn);
200 if (rc)
201 break;
202 sk->sk_state = SMC_PEERCLOSEWAIT1;
203 } else {
204 /* peer event has changed the state */
205 goto again;
206 }
207 break;
208 case SMC_APPFINCLOSEWAIT:
209 /* socket already shutdown wr or both (active close) */
210 if (txflags->peer_done_writing &&
211 !smc_close_sent_any_close(conn)) {
212 /* just shutdown wr done, send close request */
213 rc = smc_close_final(conn);
214 if (rc)
215 break;
216 }
217 sk->sk_state = SMC_CLOSED;
218 break;
219 case SMC_APPCLOSEWAIT1:
220 case SMC_APPCLOSEWAIT2:
221 if (!smc_cdc_rxed_any_close(conn))
222 smc_close_stream_wait(smc, timeout);
223 release_sock(sk);
224 cancel_delayed_work_sync(&conn->tx_work);
225 lock_sock(sk);
226 if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
227 sk->sk_state != SMC_APPCLOSEWAIT2)
228 goto again;
229 /* confirm close from peer */
230 rc = smc_close_final(conn);
231 if (rc)
232 break;
233 if (smc_cdc_rxed_any_close(conn)) {
234 /* peer has closed the socket already */
235 sk->sk_state = SMC_CLOSED;
236 sock_put(sk); /* postponed passive closing */
237 } else {
238 /* peer has just issued a shutdown write */
239 sk->sk_state = SMC_PEERFINCLOSEWAIT;
240 }
241 break;
242 case SMC_PEERCLOSEWAIT1:
243 case SMC_PEERCLOSEWAIT2:
244 if (txflags->peer_done_writing &&
245 !smc_close_sent_any_close(conn)) {
246 /* just shutdown wr done, send close request */
247 rc = smc_close_final(conn);
248 if (rc)
249 break;
250 }
251 /* peer sending PeerConnectionClosed will cause transition */
252 break;
253 case SMC_PEERFINCLOSEWAIT:
254 /* peer sending PeerConnectionClosed will cause transition */
255 break;
256 case SMC_PROCESSABORT:
257 smc_close_abort(conn);
258 sk->sk_state = SMC_CLOSED;
259 break;
260 case SMC_PEERABORTWAIT:
261 case SMC_CLOSED:
262 /* nothing to do, add tracing in future patch */
263 break;
264 }
265
266 if (old_state != sk->sk_state)
267 sk->sk_state_change(sk);
268 return rc;
269}
270
271static void smc_close_passive_abort_received(struct smc_sock *smc)
272{
273 struct smc_cdc_conn_state_flags *txflags =
274 &smc->conn.local_tx_ctrl.conn_state_flags;
275 struct sock *sk = &smc->sk;
276
277 switch (sk->sk_state) {
278 case SMC_INIT:
279 case SMC_ACTIVE:
280 case SMC_APPCLOSEWAIT1:
281 sk->sk_state = SMC_PROCESSABORT;
282 sock_put(sk); /* passive closing */
283 break;
284 case SMC_APPFINCLOSEWAIT:
285 sk->sk_state = SMC_PROCESSABORT;
286 break;
287 case SMC_PEERCLOSEWAIT1:
288 case SMC_PEERCLOSEWAIT2:
289 if (txflags->peer_done_writing &&
290 !smc_close_sent_any_close(&smc->conn))
291 /* just shutdown, but not yet closed locally */
292 sk->sk_state = SMC_PROCESSABORT;
293 else
294 sk->sk_state = SMC_CLOSED;
295 sock_put(sk); /* passive closing */
296 break;
297 case SMC_APPCLOSEWAIT2:
298 case SMC_PEERFINCLOSEWAIT:
299 sk->sk_state = SMC_CLOSED;
300 sock_put(sk); /* passive closing */
301 break;
302 case SMC_PEERABORTWAIT:
303 sk->sk_state = SMC_CLOSED;
304 break;
305 case SMC_PROCESSABORT:
306 /* nothing to do, add tracing in future patch */
307 break;
308 }
309}
310
311/* Either some kind of closing has been received: peer_conn_closed,
312 * peer_conn_abort, or peer_done_writing
313 * or the link group of the connection terminates abnormally.
314 */
315static void smc_close_passive_work(struct work_struct *work)
316{
317 struct smc_connection *conn = container_of(work,
318 struct smc_connection,
319 close_work);
320 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
321 struct smc_cdc_conn_state_flags *rxflags;
322 struct sock *sk = &smc->sk;
323 int old_state;
324
325 lock_sock(sk);
326 old_state = sk->sk_state;
327
328 if (!conn->alert_token_local) {
329 /* abnormal termination */
330 smc_close_active_abort(smc);
331 goto wakeup;
332 }
333
334 rxflags = &conn->local_rx_ctrl.conn_state_flags;
335 if (rxflags->peer_conn_abort) {
336 /* peer has not received all data */
337 smc_close_passive_abort_received(smc);
338 release_sock(&smc->sk);
339 cancel_delayed_work_sync(&conn->tx_work);
340 lock_sock(&smc->sk);
341 goto wakeup;
342 }
343
344 switch (sk->sk_state) {
345 case SMC_INIT:
346 if (atomic_read(&conn->bytes_to_rcv) ||
347 (rxflags->peer_done_writing &&
348 !smc_cdc_rxed_any_close(conn))) {
349 sk->sk_state = SMC_APPCLOSEWAIT1;
350 } else {
351 sk->sk_state = SMC_CLOSED;
352 sock_put(sk); /* passive closing */
353 }
354 break;
355 case SMC_ACTIVE:
356 sk->sk_state = SMC_APPCLOSEWAIT1;
357 /* postpone sock_put() for passive closing to cover
358 * received SEND_SHUTDOWN as well
359 */
360 break;
361 case SMC_PEERCLOSEWAIT1:
362 if (rxflags->peer_done_writing)
363 sk->sk_state = SMC_PEERCLOSEWAIT2;
364 /* fall through */
365 /* to check for closing */
366 case SMC_PEERCLOSEWAIT2:
367 if (!smc_cdc_rxed_any_close(conn))
368 break;
369 if (sock_flag(sk, SOCK_DEAD) &&
370 smc_close_sent_any_close(conn)) {
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 sock_put(sk); /* passive closing */
378 break;
379 case SMC_PEERFINCLOSEWAIT:
380 if (smc_cdc_rxed_any_close(conn)) {
381 sk->sk_state = SMC_CLOSED;
382 sock_put(sk); /* passive closing */
383 }
384 break;
385 case SMC_APPCLOSEWAIT1:
386 case SMC_APPCLOSEWAIT2:
387 /* postpone sock_put() for passive closing to cover
388 * received SEND_SHUTDOWN as well
389 */
390 break;
391 case SMC_APPFINCLOSEWAIT:
392 case SMC_PEERABORTWAIT:
393 case SMC_PROCESSABORT:
394 case SMC_CLOSED:
395 /* nothing to do, add tracing in future patch */
396 break;
397 }
398
399wakeup:
400 sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
401 sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
402
403 if (old_state != sk->sk_state) {
404 sk->sk_state_change(sk);
405 if ((sk->sk_state == SMC_CLOSED) &&
406 (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket))
407 smc_conn_free(conn);
408 }
409 release_sock(sk);
410 sock_put(sk); /* sock_hold done by schedulers of close_work */
411}
412
413int smc_close_shutdown_write(struct smc_sock *smc)
414{
415 struct smc_connection *conn = &smc->conn;
416 struct sock *sk = &smc->sk;
417 int old_state;
418 long timeout;
419 int rc = 0;
420
421 timeout = current->flags & PF_EXITING ?
422 0 : sock_flag(sk, SOCK_LINGER) ?
423 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
424
425 old_state = sk->sk_state;
426again:
427 switch (sk->sk_state) {
428 case SMC_ACTIVE:
429 smc_close_stream_wait(smc, timeout);
430 release_sock(sk);
431 cancel_delayed_work_sync(&conn->tx_work);
432 lock_sock(sk);
433 if (sk->sk_state != SMC_ACTIVE)
434 goto again;
435 /* send close wr request */
436 rc = smc_close_wr(conn);
437 if (rc)
438 break;
439 sk->sk_state = SMC_PEERCLOSEWAIT1;
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);
446 cancel_delayed_work_sync(&conn->tx_work);
447 lock_sock(sk);
448 if (sk->sk_state != SMC_APPCLOSEWAIT1)
449 goto again;
450 /* confirm close from peer */
451 rc = smc_close_wr(conn);
452 if (rc)
453 break;
454 sk->sk_state = SMC_APPCLOSEWAIT2;
455 break;
456 case SMC_APPCLOSEWAIT2:
457 case SMC_PEERFINCLOSEWAIT:
458 case SMC_PEERCLOSEWAIT1:
459 case SMC_PEERCLOSEWAIT2:
460 case SMC_APPFINCLOSEWAIT:
461 case SMC_PROCESSABORT:
462 case SMC_PEERABORTWAIT:
463 /* nothing to do, add tracing in future patch */
464 break;
465 }
466
467 if (old_state != sk->sk_state)
468 sk->sk_state_change(sk);
469 return rc;
470}
471
472/* Initialize close properties on connection establishment. */
473void smc_close_init(struct smc_sock *smc)
474{
475 INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
476}