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 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; <<
203 186
204 timeout = current->flags & PF_EXITING 187 timeout = current->flags & PF_EXITING ?
205 0 : sock_flag(sk, SOCK_LINGE 188 0 : sock_flag(sk, SOCK_LINGER) ?
206 sk->sk_lingertime : SMC_ 189 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
207 190
208 old_state = sk->sk_state; 191 old_state = sk->sk_state;
209 again: 192 again:
210 switch (sk->sk_state) { 193 switch (sk->sk_state) {
211 case SMC_INIT: 194 case SMC_INIT:
212 sk->sk_state = SMC_CLOSED; 195 sk->sk_state = SMC_CLOSED;
213 break; 196 break;
214 case SMC_LISTEN: 197 case SMC_LISTEN:
215 sk->sk_state = SMC_CLOSED; 198 sk->sk_state = SMC_CLOSED;
216 sk->sk_state_change(sk); /* wa 199 sk->sk_state_change(sk); /* wake up accept */
217 if (smc->clcsock && smc->clcso 200 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 201 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
>> 202 /* wake up kernel_accept of smc_tcp_listen_worker */
>> 203 smc->clcsock->sk->sk_data_ready(smc->clcsock->sk);
224 } 204 }
225 smc_close_cleanup_listen(sk); 205 smc_close_cleanup_listen(sk);
226 release_sock(sk); 206 release_sock(sk);
227 flush_work(&smc->tcp_listen_wo 207 flush_work(&smc->tcp_listen_work);
228 lock_sock(sk); 208 lock_sock(sk);
229 break; 209 break;
230 case SMC_ACTIVE: 210 case SMC_ACTIVE:
231 smc_close_stream_wait(smc, tim 211 smc_close_stream_wait(smc, timeout);
232 release_sock(sk); 212 release_sock(sk);
233 cancel_delayed_work_sync(&conn 213 cancel_delayed_work_sync(&conn->tx_work);
234 lock_sock(sk); 214 lock_sock(sk);
235 if (sk->sk_state == SMC_ACTIVE 215 if (sk->sk_state == SMC_ACTIVE) {
236 /* send close request 216 /* send close request */
237 rc = smc_close_final(c 217 rc = smc_close_final(conn);
>> 218 if (rc)
>> 219 break;
238 sk->sk_state = SMC_PEE 220 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 { 221 } else {
249 /* peer event has chan 222 /* peer event has changed the state */
250 goto again; 223 goto again;
251 } 224 }
252 break; 225 break;
253 case SMC_APPFINCLOSEWAIT: 226 case SMC_APPFINCLOSEWAIT:
254 /* socket already shutdown wr 227 /* socket already shutdown wr or both (active close) */
255 if (txflags->peer_done_writing 228 if (txflags->peer_done_writing &&
256 !smc_close_sent_any_close( 229 !smc_close_sent_any_close(conn)) {
257 /* just shutdown wr do 230 /* just shutdown wr done, send close request */
258 rc = smc_close_final(c 231 rc = smc_close_final(conn);
>> 232 if (rc)
>> 233 break;
259 } 234 }
260 sk->sk_state = SMC_CLOSED; 235 sk->sk_state = SMC_CLOSED;
261 break; 236 break;
262 case SMC_APPCLOSEWAIT1: 237 case SMC_APPCLOSEWAIT1:
263 case SMC_APPCLOSEWAIT2: 238 case SMC_APPCLOSEWAIT2:
264 if (!smc_cdc_rxed_any_close(co 239 if (!smc_cdc_rxed_any_close(conn))
265 smc_close_stream_wait( 240 smc_close_stream_wait(smc, timeout);
266 release_sock(sk); 241 release_sock(sk);
267 cancel_delayed_work_sync(&conn 242 cancel_delayed_work_sync(&conn->tx_work);
268 lock_sock(sk); 243 lock_sock(sk);
269 if (sk->sk_state != SMC_APPCLO 244 if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
270 sk->sk_state != SMC_APPCLO 245 sk->sk_state != SMC_APPCLOSEWAIT2)
271 goto again; 246 goto again;
272 /* confirm close from peer */ 247 /* confirm close from peer */
273 rc = smc_close_final(conn); 248 rc = smc_close_final(conn);
>> 249 if (rc)
>> 250 break;
274 if (smc_cdc_rxed_any_close(con 251 if (smc_cdc_rxed_any_close(conn)) {
275 /* peer has closed the 252 /* peer has closed the socket already */
276 sk->sk_state = SMC_CLO 253 sk->sk_state = SMC_CLOSED;
277 sock_put(sk); /* postp 254 sock_put(sk); /* postponed passive closing */
278 } else { 255 } else {
279 /* peer has just issue 256 /* peer has just issued a shutdown write */
280 sk->sk_state = SMC_PEE 257 sk->sk_state = SMC_PEERFINCLOSEWAIT;
281 } 258 }
282 break; 259 break;
283 case SMC_PEERCLOSEWAIT1: 260 case SMC_PEERCLOSEWAIT1:
284 case SMC_PEERCLOSEWAIT2: 261 case SMC_PEERCLOSEWAIT2:
285 if (txflags->peer_done_writing 262 if (txflags->peer_done_writing &&
286 !smc_close_sent_any_close( 263 !smc_close_sent_any_close(conn)) {
287 /* just shutdown wr do 264 /* just shutdown wr done, send close request */
288 rc = smc_close_final(c 265 rc = smc_close_final(conn);
>> 266 if (rc)
>> 267 break;
289 } 268 }
290 /* peer sending PeerConnection 269 /* peer sending PeerConnectionClosed will cause transition */
291 break; 270 break;
292 case SMC_PEERFINCLOSEWAIT: 271 case SMC_PEERFINCLOSEWAIT:
293 /* peer sending PeerConnection 272 /* peer sending PeerConnectionClosed will cause transition */
294 break; 273 break;
295 case SMC_PROCESSABORT: 274 case SMC_PROCESSABORT:
296 rc = smc_close_abort(conn); !! 275 smc_close_abort(conn);
297 sk->sk_state = SMC_CLOSED; 276 sk->sk_state = SMC_CLOSED;
298 break; 277 break;
299 case SMC_PEERABORTWAIT: 278 case SMC_PEERABORTWAIT:
300 sk->sk_state = SMC_CLOSED; <<
301 break; <<
302 case SMC_CLOSED: 279 case SMC_CLOSED:
303 /* nothing to do, add tracing 280 /* nothing to do, add tracing in future patch */
304 break; 281 break;
305 } 282 }
306 283
307 if (old_state != sk->sk_state) 284 if (old_state != sk->sk_state)
308 sk->sk_state_change(sk); 285 sk->sk_state_change(sk);
309 return rc; 286 return rc;
310 } 287 }
311 288
312 static void smc_close_passive_abort_received(s 289 static void smc_close_passive_abort_received(struct smc_sock *smc)
313 { 290 {
314 struct smc_cdc_conn_state_flags *txfla 291 struct smc_cdc_conn_state_flags *txflags =
315 &smc->conn.local_tx_ctrl.conn_ 292 &smc->conn.local_tx_ctrl.conn_state_flags;
316 struct sock *sk = &smc->sk; 293 struct sock *sk = &smc->sk;
317 294
318 switch (sk->sk_state) { 295 switch (sk->sk_state) {
319 case SMC_INIT: 296 case SMC_INIT:
320 case SMC_ACTIVE: 297 case SMC_ACTIVE:
321 case SMC_APPCLOSEWAIT1: 298 case SMC_APPCLOSEWAIT1:
322 sk->sk_state = SMC_PROCESSABOR 299 sk->sk_state = SMC_PROCESSABORT;
323 sock_put(sk); /* passive closi 300 sock_put(sk); /* passive closing */
324 break; 301 break;
325 case SMC_APPFINCLOSEWAIT: 302 case SMC_APPFINCLOSEWAIT:
326 sk->sk_state = SMC_PROCESSABOR 303 sk->sk_state = SMC_PROCESSABORT;
327 break; 304 break;
328 case SMC_PEERCLOSEWAIT1: 305 case SMC_PEERCLOSEWAIT1:
329 case SMC_PEERCLOSEWAIT2: 306 case SMC_PEERCLOSEWAIT2:
330 if (txflags->peer_done_writing 307 if (txflags->peer_done_writing &&
331 !smc_close_sent_any_close( 308 !smc_close_sent_any_close(&smc->conn))
332 /* just shutdown, but 309 /* just shutdown, but not yet closed locally */
333 sk->sk_state = SMC_PRO 310 sk->sk_state = SMC_PROCESSABORT;
334 else 311 else
335 sk->sk_state = SMC_CLO 312 sk->sk_state = SMC_CLOSED;
336 sock_put(sk); /* passive closi 313 sock_put(sk); /* passive closing */
337 break; 314 break;
338 case SMC_APPCLOSEWAIT2: 315 case SMC_APPCLOSEWAIT2:
339 case SMC_PEERFINCLOSEWAIT: 316 case SMC_PEERFINCLOSEWAIT:
340 sk->sk_state = SMC_CLOSED; 317 sk->sk_state = SMC_CLOSED;
341 sock_put(sk); /* passive closi 318 sock_put(sk); /* passive closing */
342 break; 319 break;
343 case SMC_PEERABORTWAIT: 320 case SMC_PEERABORTWAIT:
344 sk->sk_state = SMC_CLOSED; 321 sk->sk_state = SMC_CLOSED;
345 break; 322 break;
346 case SMC_PROCESSABORT: 323 case SMC_PROCESSABORT:
347 /* nothing to do, add tracing in futur 324 /* nothing to do, add tracing in future patch */
348 break; 325 break;
349 } 326 }
350 } 327 }
351 328
352 /* Either some kind of closing has been receiv 329 /* Either some kind of closing has been received: peer_conn_closed,
353 * peer_conn_abort, or peer_done_writing 330 * peer_conn_abort, or peer_done_writing
354 * or the link group of the connection termina 331 * or the link group of the connection terminates abnormally.
355 */ 332 */
356 static void smc_close_passive_work(struct work 333 static void smc_close_passive_work(struct work_struct *work)
357 { 334 {
358 struct smc_connection *conn = containe 335 struct smc_connection *conn = container_of(work,
359 336 struct smc_connection,
360 337 close_work);
361 struct smc_sock *smc = container_of(co 338 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
362 struct smc_cdc_conn_state_flags *rxfla 339 struct smc_cdc_conn_state_flags *rxflags;
363 bool release_clcsock = false; 340 bool release_clcsock = false;
364 struct sock *sk = &smc->sk; 341 struct sock *sk = &smc->sk;
365 int old_state; 342 int old_state;
366 343
367 lock_sock(sk); 344 lock_sock(sk);
368 old_state = sk->sk_state; 345 old_state = sk->sk_state;
369 346
>> 347 if (!conn->alert_token_local) {
>> 348 /* abnormal termination */
>> 349 smc_close_active_abort(smc);
>> 350 goto wakeup;
>> 351 }
>> 352
370 rxflags = &conn->local_rx_ctrl.conn_st 353 rxflags = &conn->local_rx_ctrl.conn_state_flags;
371 if (rxflags->peer_conn_abort) { 354 if (rxflags->peer_conn_abort) {
372 /* peer has not received all d 355 /* peer has not received all data */
373 smc_close_passive_abort_receiv 356 smc_close_passive_abort_received(smc);
374 release_sock(sk); !! 357 release_sock(&smc->sk);
375 cancel_delayed_work_sync(&conn 358 cancel_delayed_work_sync(&conn->tx_work);
376 lock_sock(sk); !! 359 lock_sock(&smc->sk);
377 goto wakeup; 360 goto wakeup;
378 } 361 }
379 362
380 switch (sk->sk_state) { 363 switch (sk->sk_state) {
381 case SMC_INIT: 364 case SMC_INIT:
382 sk->sk_state = SMC_APPCLOSEWAI 365 sk->sk_state = SMC_APPCLOSEWAIT1;
383 break; 366 break;
384 case SMC_ACTIVE: 367 case SMC_ACTIVE:
385 sk->sk_state = SMC_APPCLOSEWAI 368 sk->sk_state = SMC_APPCLOSEWAIT1;
386 /* postpone sock_put() for pas 369 /* postpone sock_put() for passive closing to cover
387 * received SEND_SHUTDOWN as w 370 * received SEND_SHUTDOWN as well
388 */ 371 */
389 break; 372 break;
390 case SMC_PEERCLOSEWAIT1: 373 case SMC_PEERCLOSEWAIT1:
391 if (rxflags->peer_done_writing 374 if (rxflags->peer_done_writing)
392 sk->sk_state = SMC_PEE 375 sk->sk_state = SMC_PEERCLOSEWAIT2;
393 fallthrough; !! 376 /* fall through */
394 /* to check for closing */ 377 /* to check for closing */
395 case SMC_PEERCLOSEWAIT2: 378 case SMC_PEERCLOSEWAIT2:
396 if (!smc_cdc_rxed_any_close(co 379 if (!smc_cdc_rxed_any_close(conn))
397 break; 380 break;
398 if (sock_flag(sk, SOCK_DEAD) & 381 if (sock_flag(sk, SOCK_DEAD) &&
399 smc_close_sent_any_close(c 382 smc_close_sent_any_close(conn)) {
400 /* smc_release has alr 383 /* smc_release has already been called locally */
401 sk->sk_state = SMC_CLO 384 sk->sk_state = SMC_CLOSED;
402 } else { 385 } else {
403 /* just shutdown, but 386 /* just shutdown, but not yet closed locally */
404 sk->sk_state = SMC_APP 387 sk->sk_state = SMC_APPFINCLOSEWAIT;
405 } 388 }
406 sock_put(sk); /* passive closi 389 sock_put(sk); /* passive closing */
407 break; 390 break;
408 case SMC_PEERFINCLOSEWAIT: 391 case SMC_PEERFINCLOSEWAIT:
409 if (smc_cdc_rxed_any_close(con 392 if (smc_cdc_rxed_any_close(conn)) {
410 sk->sk_state = SMC_CLO 393 sk->sk_state = SMC_CLOSED;
411 sock_put(sk); /* passi 394 sock_put(sk); /* passive closing */
412 } 395 }
413 break; 396 break;
414 case SMC_APPCLOSEWAIT1: 397 case SMC_APPCLOSEWAIT1:
415 case SMC_APPCLOSEWAIT2: 398 case SMC_APPCLOSEWAIT2:
416 /* postpone sock_put() for pas 399 /* postpone sock_put() for passive closing to cover
417 * received SEND_SHUTDOWN as w 400 * received SEND_SHUTDOWN as well
418 */ 401 */
419 break; 402 break;
420 case SMC_APPFINCLOSEWAIT: 403 case SMC_APPFINCLOSEWAIT:
421 case SMC_PEERABORTWAIT: 404 case SMC_PEERABORTWAIT:
422 case SMC_PROCESSABORT: 405 case SMC_PROCESSABORT:
423 case SMC_CLOSED: 406 case SMC_CLOSED:
424 /* nothing to do, add tracing 407 /* nothing to do, add tracing in future patch */
425 break; 408 break;
426 } 409 }
427 410
428 wakeup: 411 wakeup:
429 sk->sk_data_ready(sk); /* wakeup block 412 sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
430 sk->sk_write_space(sk); /* wakeup bloc 413 sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
431 414
432 if (old_state != sk->sk_state) { 415 if (old_state != sk->sk_state) {
433 sk->sk_state_change(sk); 416 sk->sk_state_change(sk);
434 if ((sk->sk_state == SMC_CLOSE 417 if ((sk->sk_state == SMC_CLOSED) &&
435 (sock_flag(sk, SOCK_DEAD) 418 (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
436 smc_conn_free(conn); 419 smc_conn_free(conn);
437 if (smc->clcsock) 420 if (smc->clcsock)
438 release_clcsoc 421 release_clcsock = true;
439 } 422 }
440 } 423 }
441 release_sock(sk); 424 release_sock(sk);
442 if (release_clcsock) 425 if (release_clcsock)
443 smc_clcsock_release(smc); 426 smc_clcsock_release(smc);
444 sock_put(sk); /* sock_hold done by sch 427 sock_put(sk); /* sock_hold done by schedulers of close_work */
445 } 428 }
446 429
447 int smc_close_shutdown_write(struct smc_sock * 430 int smc_close_shutdown_write(struct smc_sock *smc)
448 { 431 {
449 struct smc_connection *conn = &smc->co 432 struct smc_connection *conn = &smc->conn;
450 struct sock *sk = &smc->sk; 433 struct sock *sk = &smc->sk;
451 int old_state; 434 int old_state;
452 long timeout; 435 long timeout;
453 int rc = 0; 436 int rc = 0;
454 437
455 timeout = current->flags & PF_EXITING 438 timeout = current->flags & PF_EXITING ?
456 0 : sock_flag(sk, SOCK_LINGE 439 0 : sock_flag(sk, SOCK_LINGER) ?
457 sk->sk_lingertime : SMC_ 440 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
458 441
459 old_state = sk->sk_state; 442 old_state = sk->sk_state;
460 again: 443 again:
461 switch (sk->sk_state) { 444 switch (sk->sk_state) {
462 case SMC_ACTIVE: 445 case SMC_ACTIVE:
463 smc_close_stream_wait(smc, tim 446 smc_close_stream_wait(smc, timeout);
464 release_sock(sk); 447 release_sock(sk);
465 cancel_delayed_work_sync(&conn 448 cancel_delayed_work_sync(&conn->tx_work);
466 lock_sock(sk); 449 lock_sock(sk);
467 if (sk->sk_state != SMC_ACTIVE 450 if (sk->sk_state != SMC_ACTIVE)
468 goto again; 451 goto again;
469 /* send close wr request */ 452 /* send close wr request */
470 rc = smc_close_wr(conn); 453 rc = smc_close_wr(conn);
>> 454 if (rc)
>> 455 break;
471 sk->sk_state = SMC_PEERCLOSEWA 456 sk->sk_state = SMC_PEERCLOSEWAIT1;
472 break; 457 break;
473 case SMC_APPCLOSEWAIT1: 458 case SMC_APPCLOSEWAIT1:
474 /* passive close */ 459 /* passive close */
475 if (!smc_cdc_rxed_any_close(co 460 if (!smc_cdc_rxed_any_close(conn))
476 smc_close_stream_wait( 461 smc_close_stream_wait(smc, timeout);
477 release_sock(sk); 462 release_sock(sk);
478 cancel_delayed_work_sync(&conn 463 cancel_delayed_work_sync(&conn->tx_work);
479 lock_sock(sk); 464 lock_sock(sk);
480 if (sk->sk_state != SMC_APPCLO 465 if (sk->sk_state != SMC_APPCLOSEWAIT1)
481 goto again; 466 goto again;
482 /* confirm close from peer */ 467 /* confirm close from peer */
483 rc = smc_close_wr(conn); 468 rc = smc_close_wr(conn);
>> 469 if (rc)
>> 470 break;
484 sk->sk_state = SMC_APPCLOSEWAI 471 sk->sk_state = SMC_APPCLOSEWAIT2;
485 break; 472 break;
486 case SMC_APPCLOSEWAIT2: 473 case SMC_APPCLOSEWAIT2:
487 case SMC_PEERFINCLOSEWAIT: 474 case SMC_PEERFINCLOSEWAIT:
488 case SMC_PEERCLOSEWAIT1: 475 case SMC_PEERCLOSEWAIT1:
489 case SMC_PEERCLOSEWAIT2: 476 case SMC_PEERCLOSEWAIT2:
490 case SMC_APPFINCLOSEWAIT: 477 case SMC_APPFINCLOSEWAIT:
491 case SMC_PROCESSABORT: 478 case SMC_PROCESSABORT:
492 case SMC_PEERABORTWAIT: 479 case SMC_PEERABORTWAIT:
493 /* nothing to do, add tracing 480 /* nothing to do, add tracing in future patch */
494 break; 481 break;
495 } 482 }
496 483
497 if (old_state != sk->sk_state) 484 if (old_state != sk->sk_state)
498 sk->sk_state_change(sk); 485 sk->sk_state_change(sk);
499 return rc; 486 return rc;
500 } 487 }
501 488
502 /* Initialize close properties on connection e 489 /* Initialize close properties on connection establishment. */
503 void smc_close_init(struct smc_sock *smc) 490 void smc_close_init(struct smc_sock *smc)
504 { 491 {
505 INIT_WORK(&smc->conn.close_work, smc_c 492 INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
506 } 493 }
507 494
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