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