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 <<
61 smc_tx_pending(&smc->conn); <<
62 <<
63 smc->wait_close_tx_prepared = 1; 60 smc->wait_close_tx_prepared = 1;
64 add_wait_queue(sk_sleep(sk), &wait); 61 add_wait_queue(sk_sleep(sk), &wait);
65 while (!signal_pending(current) && tim 62 while (!signal_pending(current) && timeout) {
66 int rc; 63 int rc;
67 64
68 rc = sk_wait_event(sk, &timeou 65 rc = sk_wait_event(sk, &timeout,
69 !smc_tx_pre 66 !smc_tx_prepared_sends(&smc->conn) ||
70 READ_ONCE(s 67 READ_ONCE(sk->sk_err) == ECONNABORTED ||
71 READ_ONCE(s 68 READ_ONCE(sk->sk_err) == ECONNRESET ||
72 smc->conn.k 69 smc->conn.killed,
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) 98 if (conn->killed)
102 return -EPIPE; 99 return -EPIPE;
103 100
104 return smc_cdc_get_slot_and_msg_send(c 101 return smc_cdc_get_slot_and_msg_send(conn);
105 } 102 }
106 103
107 int smc_close_abort(struct smc_connection *con 104 int smc_close_abort(struct smc_connection *conn)
108 { 105 {
109 conn->local_tx_ctrl.conn_state_flags.p 106 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
110 107
111 return smc_cdc_get_slot_and_msg_send(c 108 return smc_cdc_get_slot_and_msg_send(conn);
112 } 109 }
113 110
114 static void smc_close_cancel_work(struct smc_s 111 static void smc_close_cancel_work(struct smc_sock *smc)
115 { 112 {
116 struct sock *sk = &smc->sk; 113 struct sock *sk = &smc->sk;
117 114
118 release_sock(sk); 115 release_sock(sk);
119 if (cancel_work_sync(&smc->conn.close_ 116 if (cancel_work_sync(&smc->conn.close_work))
120 sock_put(sk); 117 sock_put(sk);
121 cancel_delayed_work_sync(&smc->conn.tx 118 cancel_delayed_work_sync(&smc->conn.tx_work);
122 lock_sock(sk); 119 lock_sock(sk);
123 } 120 }
124 121
125 /* terminate smc socket abnormally - active ab 122 /* terminate smc socket abnormally - active abort
126 * link group is terminated, i.e. RDMA communi 123 * link group is terminated, i.e. RDMA communication no longer possible
127 */ 124 */
128 void smc_close_active_abort(struct smc_sock *s 125 void smc_close_active_abort(struct smc_sock *smc)
129 { 126 {
130 struct sock *sk = &smc->sk; 127 struct sock *sk = &smc->sk;
131 bool release_clcsock = false; 128 bool release_clcsock = false;
132 129
133 if (sk->sk_state != SMC_INIT && smc->c 130 if (sk->sk_state != SMC_INIT && smc->clcsock && smc->clcsock->sk) {
134 sk->sk_err = ECONNABORTED; 131 sk->sk_err = ECONNABORTED;
135 if (smc->clcsock && smc->clcso 132 if (smc->clcsock && smc->clcsock->sk)
136 tcp_abort(smc->clcsock 133 tcp_abort(smc->clcsock->sk, ECONNABORTED);
137 } 134 }
138 switch (sk->sk_state) { 135 switch (sk->sk_state) {
139 case SMC_ACTIVE: 136 case SMC_ACTIVE:
140 case SMC_APPCLOSEWAIT1: 137 case SMC_APPCLOSEWAIT1:
141 case SMC_APPCLOSEWAIT2: 138 case SMC_APPCLOSEWAIT2:
142 sk->sk_state = SMC_PEERABORTWA 139 sk->sk_state = SMC_PEERABORTWAIT;
143 smc_close_cancel_work(smc); 140 smc_close_cancel_work(smc);
144 if (sk->sk_state != SMC_PEERAB 141 if (sk->sk_state != SMC_PEERABORTWAIT)
145 break; 142 break;
146 sk->sk_state = SMC_CLOSED; 143 sk->sk_state = SMC_CLOSED;
147 sock_put(sk); /* (postponed) p 144 sock_put(sk); /* (postponed) passive closing */
148 break; 145 break;
149 case SMC_PEERCLOSEWAIT1: 146 case SMC_PEERCLOSEWAIT1:
150 case SMC_PEERCLOSEWAIT2: 147 case SMC_PEERCLOSEWAIT2:
151 case SMC_PEERFINCLOSEWAIT: 148 case SMC_PEERFINCLOSEWAIT:
152 sk->sk_state = SMC_PEERABORTWA 149 sk->sk_state = SMC_PEERABORTWAIT;
153 smc_close_cancel_work(smc); 150 smc_close_cancel_work(smc);
154 if (sk->sk_state != SMC_PEERAB 151 if (sk->sk_state != SMC_PEERABORTWAIT)
155 break; 152 break;
156 sk->sk_state = SMC_CLOSED; 153 sk->sk_state = SMC_CLOSED;
157 smc_conn_free(&smc->conn); 154 smc_conn_free(&smc->conn);
158 release_clcsock = true; 155 release_clcsock = true;
159 sock_put(sk); /* passive closi 156 sock_put(sk); /* passive closing */
160 break; 157 break;
161 case SMC_PROCESSABORT: 158 case SMC_PROCESSABORT:
162 case SMC_APPFINCLOSEWAIT: 159 case SMC_APPFINCLOSEWAIT:
163 sk->sk_state = SMC_PEERABORTWA 160 sk->sk_state = SMC_PEERABORTWAIT;
164 smc_close_cancel_work(smc); 161 smc_close_cancel_work(smc);
165 if (sk->sk_state != SMC_PEERAB 162 if (sk->sk_state != SMC_PEERABORTWAIT)
166 break; 163 break;
167 sk->sk_state = SMC_CLOSED; 164 sk->sk_state = SMC_CLOSED;
168 smc_conn_free(&smc->conn); 165 smc_conn_free(&smc->conn);
169 release_clcsock = true; 166 release_clcsock = true;
170 break; 167 break;
171 case SMC_INIT: 168 case SMC_INIT:
172 case SMC_PEERABORTWAIT: 169 case SMC_PEERABORTWAIT:
173 case SMC_CLOSED: 170 case SMC_CLOSED:
174 break; 171 break;
175 } 172 }
176 173
177 smc_sock_set_flag(sk, SOCK_DEAD); 174 smc_sock_set_flag(sk, SOCK_DEAD);
178 sk->sk_state_change(sk); 175 sk->sk_state_change(sk);
179 176
180 if (release_clcsock) { 177 if (release_clcsock) {
181 release_sock(sk); 178 release_sock(sk);
182 smc_clcsock_release(smc); 179 smc_clcsock_release(smc);
183 lock_sock(sk); 180 lock_sock(sk);
184 } 181 }
185 } 182 }
186 183
187 static inline bool smc_close_sent_any_close(st 184 static inline bool smc_close_sent_any_close(struct smc_connection *conn)
188 { 185 {
189 return conn->local_tx_ctrl.conn_state_ 186 return conn->local_tx_ctrl.conn_state_flags.peer_conn_abort ||
190 conn->local_tx_ctrl.conn_state_ 187 conn->local_tx_ctrl.conn_state_flags.peer_conn_closed;
191 } 188 }
192 189
193 int smc_close_active(struct smc_sock *smc) 190 int smc_close_active(struct smc_sock *smc)
194 { 191 {
195 struct smc_cdc_conn_state_flags *txfla 192 struct smc_cdc_conn_state_flags *txflags =
196 &smc->conn.local_tx_ctrl.conn_ 193 &smc->conn.local_tx_ctrl.conn_state_flags;
197 struct smc_connection *conn = &smc->co 194 struct smc_connection *conn = &smc->conn;
198 struct sock *sk = &smc->sk; 195 struct sock *sk = &smc->sk;
199 int old_state; 196 int old_state;
200 long timeout; 197 long timeout;
201 int rc = 0; 198 int rc = 0;
202 int rc1 = 0; 199 int rc1 = 0;
203 200
204 timeout = current->flags & PF_EXITING 201 timeout = current->flags & PF_EXITING ?
205 0 : sock_flag(sk, SOCK_LINGE 202 0 : sock_flag(sk, SOCK_LINGER) ?
206 sk->sk_lingertime : SMC_ 203 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
207 204
208 old_state = sk->sk_state; 205 old_state = sk->sk_state;
209 again: 206 again:
210 switch (sk->sk_state) { 207 switch (sk->sk_state) {
211 case SMC_INIT: 208 case SMC_INIT:
212 sk->sk_state = SMC_CLOSED; 209 sk->sk_state = SMC_CLOSED;
213 break; 210 break;
214 case SMC_LISTEN: 211 case SMC_LISTEN:
215 sk->sk_state = SMC_CLOSED; 212 sk->sk_state = SMC_CLOSED;
216 sk->sk_state_change(sk); /* wa 213 sk->sk_state_change(sk); /* wake up accept */
217 if (smc->clcsock && smc->clcso 214 if (smc->clcsock && smc->clcsock->sk) {
218 write_lock_bh(&smc->cl !! 215 smc->clcsock->sk->sk_data_ready = smc->clcsk_data_ready;
219 smc_clcsock_restore_cb <<
220 <<
221 smc->clcsock->sk->sk_u 216 smc->clcsock->sk->sk_user_data = NULL;
222 write_unlock_bh(&smc-> <<
223 rc = kernel_sock_shutd 217 rc = kernel_sock_shutdown(smc->clcsock, SHUT_RDWR);
224 } 218 }
225 smc_close_cleanup_listen(sk); 219 smc_close_cleanup_listen(sk);
226 release_sock(sk); 220 release_sock(sk);
227 flush_work(&smc->tcp_listen_wo 221 flush_work(&smc->tcp_listen_work);
228 lock_sock(sk); 222 lock_sock(sk);
229 break; 223 break;
230 case SMC_ACTIVE: 224 case SMC_ACTIVE:
231 smc_close_stream_wait(smc, tim 225 smc_close_stream_wait(smc, timeout);
232 release_sock(sk); 226 release_sock(sk);
233 cancel_delayed_work_sync(&conn 227 cancel_delayed_work_sync(&conn->tx_work);
234 lock_sock(sk); 228 lock_sock(sk);
235 if (sk->sk_state == SMC_ACTIVE 229 if (sk->sk_state == SMC_ACTIVE) {
236 /* send close request 230 /* send close request */
237 rc = smc_close_final(c 231 rc = smc_close_final(conn);
238 sk->sk_state = SMC_PEE 232 sk->sk_state = SMC_PEERCLOSEWAIT1;
239 233
240 /* actively shutdown c 234 /* actively shutdown clcsock before peer close it,
241 * prevent peer from e 235 * prevent peer from entering TIME_WAIT state.
242 */ 236 */
243 if (smc->clcsock && sm 237 if (smc->clcsock && smc->clcsock->sk) {
244 rc1 = kernel_s 238 rc1 = kernel_sock_shutdown(smc->clcsock,
245 239 SHUT_RDWR);
246 rc = rc ? rc : 240 rc = rc ? rc : rc1;
247 } 241 }
248 } else { 242 } else {
249 /* peer event has chan 243 /* peer event has changed the state */
250 goto again; 244 goto again;
251 } 245 }
252 break; 246 break;
253 case SMC_APPFINCLOSEWAIT: 247 case SMC_APPFINCLOSEWAIT:
254 /* socket already shutdown wr 248 /* socket already shutdown wr or both (active close) */
255 if (txflags->peer_done_writing 249 if (txflags->peer_done_writing &&
256 !smc_close_sent_any_close( 250 !smc_close_sent_any_close(conn)) {
257 /* just shutdown wr do 251 /* just shutdown wr done, send close request */
258 rc = smc_close_final(c 252 rc = smc_close_final(conn);
259 } 253 }
260 sk->sk_state = SMC_CLOSED; 254 sk->sk_state = SMC_CLOSED;
261 break; 255 break;
262 case SMC_APPCLOSEWAIT1: 256 case SMC_APPCLOSEWAIT1:
263 case SMC_APPCLOSEWAIT2: 257 case SMC_APPCLOSEWAIT2:
264 if (!smc_cdc_rxed_any_close(co 258 if (!smc_cdc_rxed_any_close(conn))
265 smc_close_stream_wait( 259 smc_close_stream_wait(smc, timeout);
266 release_sock(sk); 260 release_sock(sk);
267 cancel_delayed_work_sync(&conn 261 cancel_delayed_work_sync(&conn->tx_work);
268 lock_sock(sk); 262 lock_sock(sk);
269 if (sk->sk_state != SMC_APPCLO 263 if (sk->sk_state != SMC_APPCLOSEWAIT1 &&
270 sk->sk_state != SMC_APPCLO 264 sk->sk_state != SMC_APPCLOSEWAIT2)
271 goto again; 265 goto again;
272 /* confirm close from peer */ 266 /* confirm close from peer */
273 rc = smc_close_final(conn); 267 rc = smc_close_final(conn);
274 if (smc_cdc_rxed_any_close(con 268 if (smc_cdc_rxed_any_close(conn)) {
275 /* peer has closed the 269 /* peer has closed the socket already */
276 sk->sk_state = SMC_CLO 270 sk->sk_state = SMC_CLOSED;
277 sock_put(sk); /* postp 271 sock_put(sk); /* postponed passive closing */
278 } else { 272 } else {
279 /* peer has just issue 273 /* peer has just issued a shutdown write */
280 sk->sk_state = SMC_PEE 274 sk->sk_state = SMC_PEERFINCLOSEWAIT;
281 } 275 }
282 break; 276 break;
283 case SMC_PEERCLOSEWAIT1: 277 case SMC_PEERCLOSEWAIT1:
284 case SMC_PEERCLOSEWAIT2: 278 case SMC_PEERCLOSEWAIT2:
285 if (txflags->peer_done_writing 279 if (txflags->peer_done_writing &&
286 !smc_close_sent_any_close( 280 !smc_close_sent_any_close(conn)) {
287 /* just shutdown wr do 281 /* just shutdown wr done, send close request */
288 rc = smc_close_final(c 282 rc = smc_close_final(conn);
289 } 283 }
290 /* peer sending PeerConnection 284 /* peer sending PeerConnectionClosed will cause transition */
291 break; 285 break;
292 case SMC_PEERFINCLOSEWAIT: 286 case SMC_PEERFINCLOSEWAIT:
293 /* peer sending PeerConnection 287 /* peer sending PeerConnectionClosed will cause transition */
294 break; 288 break;
295 case SMC_PROCESSABORT: 289 case SMC_PROCESSABORT:
296 rc = smc_close_abort(conn); 290 rc = smc_close_abort(conn);
297 sk->sk_state = SMC_CLOSED; 291 sk->sk_state = SMC_CLOSED;
298 break; 292 break;
299 case SMC_PEERABORTWAIT: 293 case SMC_PEERABORTWAIT:
300 sk->sk_state = SMC_CLOSED; 294 sk->sk_state = SMC_CLOSED;
301 break; 295 break;
302 case SMC_CLOSED: 296 case SMC_CLOSED:
303 /* nothing to do, add tracing 297 /* nothing to do, add tracing in future patch */
304 break; 298 break;
305 } 299 }
306 300
307 if (old_state != sk->sk_state) 301 if (old_state != sk->sk_state)
308 sk->sk_state_change(sk); 302 sk->sk_state_change(sk);
309 return rc; 303 return rc;
310 } 304 }
311 305
312 static void smc_close_passive_abort_received(s 306 static void smc_close_passive_abort_received(struct smc_sock *smc)
313 { 307 {
314 struct smc_cdc_conn_state_flags *txfla 308 struct smc_cdc_conn_state_flags *txflags =
315 &smc->conn.local_tx_ctrl.conn_ 309 &smc->conn.local_tx_ctrl.conn_state_flags;
316 struct sock *sk = &smc->sk; 310 struct sock *sk = &smc->sk;
317 311
318 switch (sk->sk_state) { 312 switch (sk->sk_state) {
319 case SMC_INIT: 313 case SMC_INIT:
320 case SMC_ACTIVE: 314 case SMC_ACTIVE:
321 case SMC_APPCLOSEWAIT1: 315 case SMC_APPCLOSEWAIT1:
322 sk->sk_state = SMC_PROCESSABOR 316 sk->sk_state = SMC_PROCESSABORT;
323 sock_put(sk); /* passive closi 317 sock_put(sk); /* passive closing */
324 break; 318 break;
325 case SMC_APPFINCLOSEWAIT: 319 case SMC_APPFINCLOSEWAIT:
326 sk->sk_state = SMC_PROCESSABOR 320 sk->sk_state = SMC_PROCESSABORT;
327 break; 321 break;
328 case SMC_PEERCLOSEWAIT1: 322 case SMC_PEERCLOSEWAIT1:
329 case SMC_PEERCLOSEWAIT2: 323 case SMC_PEERCLOSEWAIT2:
330 if (txflags->peer_done_writing 324 if (txflags->peer_done_writing &&
331 !smc_close_sent_any_close( 325 !smc_close_sent_any_close(&smc->conn))
332 /* just shutdown, but 326 /* just shutdown, but not yet closed locally */
333 sk->sk_state = SMC_PRO 327 sk->sk_state = SMC_PROCESSABORT;
334 else 328 else
335 sk->sk_state = SMC_CLO 329 sk->sk_state = SMC_CLOSED;
336 sock_put(sk); /* passive closi 330 sock_put(sk); /* passive closing */
337 break; 331 break;
338 case SMC_APPCLOSEWAIT2: 332 case SMC_APPCLOSEWAIT2:
339 case SMC_PEERFINCLOSEWAIT: 333 case SMC_PEERFINCLOSEWAIT:
340 sk->sk_state = SMC_CLOSED; 334 sk->sk_state = SMC_CLOSED;
341 sock_put(sk); /* passive closi 335 sock_put(sk); /* passive closing */
342 break; 336 break;
343 case SMC_PEERABORTWAIT: 337 case SMC_PEERABORTWAIT:
344 sk->sk_state = SMC_CLOSED; 338 sk->sk_state = SMC_CLOSED;
345 break; 339 break;
346 case SMC_PROCESSABORT: 340 case SMC_PROCESSABORT:
347 /* nothing to do, add tracing in futur 341 /* nothing to do, add tracing in future patch */
348 break; 342 break;
349 } 343 }
350 } 344 }
351 345
352 /* Either some kind of closing has been receiv 346 /* Either some kind of closing has been received: peer_conn_closed,
353 * peer_conn_abort, or peer_done_writing 347 * peer_conn_abort, or peer_done_writing
354 * or the link group of the connection termina 348 * or the link group of the connection terminates abnormally.
355 */ 349 */
356 static void smc_close_passive_work(struct work 350 static void smc_close_passive_work(struct work_struct *work)
357 { 351 {
358 struct smc_connection *conn = containe 352 struct smc_connection *conn = container_of(work,
359 353 struct smc_connection,
360 354 close_work);
361 struct smc_sock *smc = container_of(co 355 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
362 struct smc_cdc_conn_state_flags *rxfla 356 struct smc_cdc_conn_state_flags *rxflags;
363 bool release_clcsock = false; 357 bool release_clcsock = false;
364 struct sock *sk = &smc->sk; 358 struct sock *sk = &smc->sk;
365 int old_state; 359 int old_state;
366 360
367 lock_sock(sk); 361 lock_sock(sk);
368 old_state = sk->sk_state; 362 old_state = sk->sk_state;
369 363
370 rxflags = &conn->local_rx_ctrl.conn_st 364 rxflags = &conn->local_rx_ctrl.conn_state_flags;
371 if (rxflags->peer_conn_abort) { 365 if (rxflags->peer_conn_abort) {
372 /* peer has not received all d 366 /* peer has not received all data */
373 smc_close_passive_abort_receiv 367 smc_close_passive_abort_received(smc);
374 release_sock(sk); !! 368 release_sock(&smc->sk);
375 cancel_delayed_work_sync(&conn 369 cancel_delayed_work_sync(&conn->tx_work);
376 lock_sock(sk); !! 370 lock_sock(&smc->sk);
377 goto wakeup; 371 goto wakeup;
378 } 372 }
379 373
380 switch (sk->sk_state) { 374 switch (sk->sk_state) {
381 case SMC_INIT: 375 case SMC_INIT:
382 sk->sk_state = SMC_APPCLOSEWAI 376 sk->sk_state = SMC_APPCLOSEWAIT1;
383 break; 377 break;
384 case SMC_ACTIVE: 378 case SMC_ACTIVE:
385 sk->sk_state = SMC_APPCLOSEWAI 379 sk->sk_state = SMC_APPCLOSEWAIT1;
386 /* postpone sock_put() for pas 380 /* postpone sock_put() for passive closing to cover
387 * received SEND_SHUTDOWN as w 381 * received SEND_SHUTDOWN as well
388 */ 382 */
389 break; 383 break;
390 case SMC_PEERCLOSEWAIT1: 384 case SMC_PEERCLOSEWAIT1:
391 if (rxflags->peer_done_writing 385 if (rxflags->peer_done_writing)
392 sk->sk_state = SMC_PEE 386 sk->sk_state = SMC_PEERCLOSEWAIT2;
393 fallthrough; 387 fallthrough;
394 /* to check for closing */ 388 /* to check for closing */
395 case SMC_PEERCLOSEWAIT2: 389 case SMC_PEERCLOSEWAIT2:
396 if (!smc_cdc_rxed_any_close(co 390 if (!smc_cdc_rxed_any_close(conn))
397 break; 391 break;
398 if (sock_flag(sk, SOCK_DEAD) & 392 if (sock_flag(sk, SOCK_DEAD) &&
399 smc_close_sent_any_close(c 393 smc_close_sent_any_close(conn)) {
400 /* smc_release has alr 394 /* smc_release has already been called locally */
401 sk->sk_state = SMC_CLO 395 sk->sk_state = SMC_CLOSED;
402 } else { 396 } else {
403 /* just shutdown, but 397 /* just shutdown, but not yet closed locally */
404 sk->sk_state = SMC_APP 398 sk->sk_state = SMC_APPFINCLOSEWAIT;
405 } 399 }
406 sock_put(sk); /* passive closi 400 sock_put(sk); /* passive closing */
407 break; 401 break;
408 case SMC_PEERFINCLOSEWAIT: 402 case SMC_PEERFINCLOSEWAIT:
409 if (smc_cdc_rxed_any_close(con 403 if (smc_cdc_rxed_any_close(conn)) {
410 sk->sk_state = SMC_CLO 404 sk->sk_state = SMC_CLOSED;
411 sock_put(sk); /* passi 405 sock_put(sk); /* passive closing */
412 } 406 }
413 break; 407 break;
414 case SMC_APPCLOSEWAIT1: 408 case SMC_APPCLOSEWAIT1:
415 case SMC_APPCLOSEWAIT2: 409 case SMC_APPCLOSEWAIT2:
416 /* postpone sock_put() for pas 410 /* postpone sock_put() for passive closing to cover
417 * received SEND_SHUTDOWN as w 411 * received SEND_SHUTDOWN as well
418 */ 412 */
419 break; 413 break;
420 case SMC_APPFINCLOSEWAIT: 414 case SMC_APPFINCLOSEWAIT:
421 case SMC_PEERABORTWAIT: 415 case SMC_PEERABORTWAIT:
422 case SMC_PROCESSABORT: 416 case SMC_PROCESSABORT:
423 case SMC_CLOSED: 417 case SMC_CLOSED:
424 /* nothing to do, add tracing 418 /* nothing to do, add tracing in future patch */
425 break; 419 break;
426 } 420 }
427 421
428 wakeup: 422 wakeup:
429 sk->sk_data_ready(sk); /* wakeup block 423 sk->sk_data_ready(sk); /* wakeup blocked rcvbuf consumers */
430 sk->sk_write_space(sk); /* wakeup bloc 424 sk->sk_write_space(sk); /* wakeup blocked sndbuf producers */
431 425
432 if (old_state != sk->sk_state) { 426 if (old_state != sk->sk_state) {
433 sk->sk_state_change(sk); 427 sk->sk_state_change(sk);
434 if ((sk->sk_state == SMC_CLOSE 428 if ((sk->sk_state == SMC_CLOSED) &&
435 (sock_flag(sk, SOCK_DEAD) 429 (sock_flag(sk, SOCK_DEAD) || !sk->sk_socket)) {
436 smc_conn_free(conn); 430 smc_conn_free(conn);
437 if (smc->clcsock) 431 if (smc->clcsock)
438 release_clcsoc 432 release_clcsock = true;
439 } 433 }
440 } 434 }
441 release_sock(sk); 435 release_sock(sk);
442 if (release_clcsock) 436 if (release_clcsock)
443 smc_clcsock_release(smc); 437 smc_clcsock_release(smc);
444 sock_put(sk); /* sock_hold done by sch 438 sock_put(sk); /* sock_hold done by schedulers of close_work */
445 } 439 }
446 440
447 int smc_close_shutdown_write(struct smc_sock * 441 int smc_close_shutdown_write(struct smc_sock *smc)
448 { 442 {
449 struct smc_connection *conn = &smc->co 443 struct smc_connection *conn = &smc->conn;
450 struct sock *sk = &smc->sk; 444 struct sock *sk = &smc->sk;
451 int old_state; 445 int old_state;
452 long timeout; 446 long timeout;
453 int rc = 0; 447 int rc = 0;
454 448
455 timeout = current->flags & PF_EXITING 449 timeout = current->flags & PF_EXITING ?
456 0 : sock_flag(sk, SOCK_LINGE 450 0 : sock_flag(sk, SOCK_LINGER) ?
457 sk->sk_lingertime : SMC_ 451 sk->sk_lingertime : SMC_MAX_STREAM_WAIT_TIMEOUT;
458 452
459 old_state = sk->sk_state; 453 old_state = sk->sk_state;
460 again: 454 again:
461 switch (sk->sk_state) { 455 switch (sk->sk_state) {
462 case SMC_ACTIVE: 456 case SMC_ACTIVE:
463 smc_close_stream_wait(smc, tim 457 smc_close_stream_wait(smc, timeout);
464 release_sock(sk); 458 release_sock(sk);
465 cancel_delayed_work_sync(&conn 459 cancel_delayed_work_sync(&conn->tx_work);
466 lock_sock(sk); 460 lock_sock(sk);
467 if (sk->sk_state != SMC_ACTIVE 461 if (sk->sk_state != SMC_ACTIVE)
468 goto again; 462 goto again;
469 /* send close wr request */ 463 /* send close wr request */
470 rc = smc_close_wr(conn); 464 rc = smc_close_wr(conn);
471 sk->sk_state = SMC_PEERCLOSEWA 465 sk->sk_state = SMC_PEERCLOSEWAIT1;
472 break; 466 break;
473 case SMC_APPCLOSEWAIT1: 467 case SMC_APPCLOSEWAIT1:
474 /* passive close */ 468 /* passive close */
475 if (!smc_cdc_rxed_any_close(co 469 if (!smc_cdc_rxed_any_close(conn))
476 smc_close_stream_wait( 470 smc_close_stream_wait(smc, timeout);
477 release_sock(sk); 471 release_sock(sk);
478 cancel_delayed_work_sync(&conn 472 cancel_delayed_work_sync(&conn->tx_work);
479 lock_sock(sk); 473 lock_sock(sk);
480 if (sk->sk_state != SMC_APPCLO 474 if (sk->sk_state != SMC_APPCLOSEWAIT1)
481 goto again; 475 goto again;
482 /* confirm close from peer */ 476 /* confirm close from peer */
483 rc = smc_close_wr(conn); 477 rc = smc_close_wr(conn);
484 sk->sk_state = SMC_APPCLOSEWAI 478 sk->sk_state = SMC_APPCLOSEWAIT2;
485 break; 479 break;
486 case SMC_APPCLOSEWAIT2: 480 case SMC_APPCLOSEWAIT2:
487 case SMC_PEERFINCLOSEWAIT: 481 case SMC_PEERFINCLOSEWAIT:
488 case SMC_PEERCLOSEWAIT1: 482 case SMC_PEERCLOSEWAIT1:
489 case SMC_PEERCLOSEWAIT2: 483 case SMC_PEERCLOSEWAIT2:
490 case SMC_APPFINCLOSEWAIT: 484 case SMC_APPFINCLOSEWAIT:
491 case SMC_PROCESSABORT: 485 case SMC_PROCESSABORT:
492 case SMC_PEERABORTWAIT: 486 case SMC_PEERABORTWAIT:
493 /* nothing to do, add tracing 487 /* nothing to do, add tracing in future patch */
494 break; 488 break;
495 } 489 }
496 490
497 if (old_state != sk->sk_state) 491 if (old_state != sk->sk_state)
498 sk->sk_state_change(sk); 492 sk->sk_state_change(sk);
499 return rc; 493 return rc;
500 } 494 }
501 495
502 /* Initialize close properties on connection e 496 /* Initialize close properties on connection establishment. */
503 void smc_close_init(struct smc_sock *smc) 497 void smc_close_init(struct smc_sock *smc)
504 { 498 {
505 INIT_WORK(&smc->conn.close_work, smc_c 499 INIT_WORK(&smc->conn.close_work, smc_close_passive_work);
506 } 500 }
507 501
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