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