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