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