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1 | /** @file\r | |
2 | TCP timer related functions.\r | |
3 | \r | |
4 | Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>\r | |
5 | \r | |
6 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
7 | \r | |
8 | **/\r | |
9 | \r | |
10 | #include "TcpMain.h"\r | |
11 | \r | |
12 | UINT32 mTcpTick = 1000;\r | |
13 | \r | |
14 | /**\r | |
15 | Connect timeout handler.\r | |
16 | \r | |
17 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
18 | \r | |
19 | **/\r | |
20 | VOID\r | |
21 | TcpConnectTimeout (\r | |
22 | IN OUT TCP_CB *Tcb\r | |
23 | );\r | |
24 | \r | |
25 | /**\r | |
26 | Timeout handler for TCP retransmission timer.\r | |
27 | \r | |
28 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
29 | \r | |
30 | **/\r | |
31 | VOID\r | |
32 | TcpRexmitTimeout (\r | |
33 | IN OUT TCP_CB *Tcb\r | |
34 | );\r | |
35 | \r | |
36 | /**\r | |
37 | Timeout handler for window probe timer.\r | |
38 | \r | |
39 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
40 | \r | |
41 | **/\r | |
42 | VOID\r | |
43 | TcpProbeTimeout (\r | |
44 | IN OUT TCP_CB *Tcb\r | |
45 | );\r | |
46 | \r | |
47 | /**\r | |
48 | Timeout handler for keepalive timer.\r | |
49 | \r | |
50 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
51 | \r | |
52 | **/\r | |
53 | VOID\r | |
54 | TcpKeepaliveTimeout (\r | |
55 | IN OUT TCP_CB *Tcb\r | |
56 | );\r | |
57 | \r | |
58 | /**\r | |
59 | Timeout handler for FIN_WAIT_2 timer.\r | |
60 | \r | |
61 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
62 | \r | |
63 | **/\r | |
64 | VOID\r | |
65 | TcpFinwait2Timeout (\r | |
66 | IN OUT TCP_CB *Tcb\r | |
67 | );\r | |
68 | \r | |
69 | /**\r | |
70 | Timeout handler for 2MSL timer.\r | |
71 | \r | |
72 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
73 | \r | |
74 | **/\r | |
75 | VOID\r | |
76 | Tcp2MSLTimeout (\r | |
77 | IN OUT TCP_CB *Tcb\r | |
78 | );\r | |
79 | \r | |
80 | TCP_TIMER_HANDLER mTcpTimerHandler[TCP_TIMER_NUMBER] = {\r | |
81 | TcpConnectTimeout,\r | |
82 | TcpRexmitTimeout,\r | |
83 | TcpProbeTimeout,\r | |
84 | TcpKeepaliveTimeout,\r | |
85 | TcpFinwait2Timeout,\r | |
86 | Tcp2MSLTimeout,\r | |
87 | };\r | |
88 | \r | |
89 | /**\r | |
90 | Close the TCP connection.\r | |
91 | \r | |
92 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
93 | \r | |
94 | **/\r | |
95 | VOID\r | |
96 | TcpClose (\r | |
97 | IN OUT TCP_CB *Tcb\r | |
98 | )\r | |
99 | {\r | |
100 | NetbufFreeList (&Tcb->SndQue);\r | |
101 | NetbufFreeList (&Tcb->RcvQue);\r | |
102 | \r | |
103 | TcpSetState (Tcb, TCP_CLOSED);\r | |
104 | }\r | |
105 | \r | |
106 | /**\r | |
107 | Backoff the RTO.\r | |
108 | \r | |
109 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
110 | \r | |
111 | **/\r | |
112 | VOID\r | |
113 | TcpBackoffRto (\r | |
114 | IN OUT TCP_CB *Tcb\r | |
115 | )\r | |
116 | {\r | |
117 | //\r | |
118 | // Fold the RTT estimate if too many times, the estimate\r | |
119 | // may be wrong, fold it. So the next time a valid\r | |
120 | // measurement is sampled, we can start fresh.\r | |
121 | //\r | |
122 | if ((Tcb->LossTimes >= TCP_FOLD_RTT) && (Tcb->SRtt != 0)) {\r | |
123 | Tcb->RttVar += Tcb->SRtt >> 2;\r | |
124 | Tcb->SRtt = 0;\r | |
125 | }\r | |
126 | \r | |
127 | Tcb->Rto <<= 1;\r | |
128 | \r | |
129 | if (Tcb->Rto < TCP_RTO_MIN) {\r | |
130 | Tcb->Rto = TCP_RTO_MIN;\r | |
131 | } else if (Tcb->Rto > TCP_RTO_MAX) {\r | |
132 | Tcb->Rto = TCP_RTO_MAX;\r | |
133 | }\r | |
134 | }\r | |
135 | \r | |
136 | /**\r | |
137 | Connect timeout handler.\r | |
138 | \r | |
139 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
140 | \r | |
141 | **/\r | |
142 | VOID\r | |
143 | TcpConnectTimeout (\r | |
144 | IN OUT TCP_CB *Tcb\r | |
145 | )\r | |
146 | {\r | |
147 | if (!TCP_CONNECTED (Tcb->State)) {\r | |
148 | DEBUG (\r | |
149 | (DEBUG_ERROR,\r | |
150 | "TcpConnectTimeout: connection closed because connection timer timeout for TCB %p\n",\r | |
151 | Tcb)\r | |
152 | );\r | |
153 | \r | |
154 | if (EFI_ABORTED == Tcb->Sk->SockError) {\r | |
155 | SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);\r | |
156 | }\r | |
157 | \r | |
158 | if (TCP_SYN_RCVD == Tcb->State) {\r | |
159 | DEBUG (\r | |
160 | (DEBUG_WARN,\r | |
161 | "TcpConnectTimeout: send reset because connection timer timeout for TCB %p\n",\r | |
162 | Tcb)\r | |
163 | );\r | |
164 | \r | |
165 | TcpResetConnection (Tcb);\r | |
166 | }\r | |
167 | \r | |
168 | TcpClose (Tcb);\r | |
169 | }\r | |
170 | }\r | |
171 | \r | |
172 | /**\r | |
173 | Timeout handler for TCP retransmission timer.\r | |
174 | \r | |
175 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
176 | \r | |
177 | **/\r | |
178 | VOID\r | |
179 | TcpRexmitTimeout (\r | |
180 | IN OUT TCP_CB *Tcb\r | |
181 | )\r | |
182 | {\r | |
183 | UINT32 FlightSize;\r | |
184 | \r | |
185 | DEBUG (\r | |
186 | (DEBUG_WARN,\r | |
187 | "TcpRexmitTimeout: transmission timeout for TCB %p\n",\r | |
188 | Tcb)\r | |
189 | );\r | |
190 | \r | |
191 | //\r | |
192 | // Set the congestion window. FlightSize is the\r | |
193 | // amount of data that has been sent but not\r | |
194 | // yet ACKed.\r | |
195 | //\r | |
196 | FlightSize = TCP_SUB_SEQ (Tcb->SndNxt, Tcb->SndUna);\r | |
197 | Tcb->Ssthresh = MAX ((UINT32)(2 * Tcb->SndMss), FlightSize / 2);\r | |
198 | \r | |
199 | Tcb->CWnd = Tcb->SndMss;\r | |
200 | Tcb->LossRecover = Tcb->SndNxt;\r | |
201 | \r | |
202 | Tcb->LossTimes++;\r | |
203 | if ((Tcb->LossTimes > Tcb->MaxRexmit) && !TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_CONNECT)) {\r | |
204 | DEBUG (\r | |
205 | (DEBUG_ERROR,\r | |
206 | "TcpRexmitTimeout: connection closed because too many timeouts for TCB %p\n",\r | |
207 | Tcb)\r | |
208 | );\r | |
209 | \r | |
210 | if (EFI_ABORTED == Tcb->Sk->SockError) {\r | |
211 | SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);\r | |
212 | }\r | |
213 | \r | |
214 | TcpClose (Tcb);\r | |
215 | return;\r | |
216 | }\r | |
217 | \r | |
218 | TcpBackoffRto (Tcb);\r | |
219 | TcpRetransmit (Tcb, Tcb->SndUna);\r | |
220 | TcpSetTimer (Tcb, TCP_TIMER_REXMIT, Tcb->Rto);\r | |
221 | \r | |
222 | Tcb->CongestState = TCP_CONGEST_LOSS;\r | |
223 | \r | |
224 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_RTT_ON);\r | |
225 | }\r | |
226 | \r | |
227 | /**\r | |
228 | Timeout handler for window probe timer.\r | |
229 | \r | |
230 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
231 | \r | |
232 | **/\r | |
233 | VOID\r | |
234 | TcpProbeTimeout (\r | |
235 | IN OUT TCP_CB *Tcb\r | |
236 | )\r | |
237 | {\r | |
238 | //\r | |
239 | // This is the timer for sender's SWSA. RFC1122 requires\r | |
240 | // a timer set for sender's SWSA, and suggest combine it\r | |
241 | // with window probe timer. If data is sent, don't set\r | |
242 | // the probe timer, since retransmit timer is on.\r | |
243 | //\r | |
244 | if ((TcpDataToSend (Tcb, 1) != 0) && (TcpToSendData (Tcb, 1) > 0)) {\r | |
245 | ASSERT (TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_REXMIT) != 0);\r | |
246 | Tcb->ProbeTimerOn = FALSE;\r | |
247 | return;\r | |
248 | }\r | |
249 | \r | |
250 | TcpSendZeroProbe (Tcb);\r | |
251 | TcpSetProbeTimer (Tcb);\r | |
252 | }\r | |
253 | \r | |
254 | /**\r | |
255 | Timeout handler for keepalive timer.\r | |
256 | \r | |
257 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
258 | \r | |
259 | **/\r | |
260 | VOID\r | |
261 | TcpKeepaliveTimeout (\r | |
262 | IN OUT TCP_CB *Tcb\r | |
263 | )\r | |
264 | {\r | |
265 | Tcb->KeepAliveProbes++;\r | |
266 | \r | |
267 | //\r | |
268 | // Too many Keep-alive probes, drop the connection\r | |
269 | //\r | |
270 | if (Tcb->KeepAliveProbes > Tcb->MaxKeepAlive) {\r | |
271 | if (EFI_ABORTED == Tcb->Sk->SockError) {\r | |
272 | SOCK_ERROR (Tcb->Sk, EFI_TIMEOUT);\r | |
273 | }\r | |
274 | \r | |
275 | TcpClose (Tcb);\r | |
276 | return;\r | |
277 | }\r | |
278 | \r | |
279 | TcpSendZeroProbe (Tcb);\r | |
280 | TcpSetKeepaliveTimer (Tcb);\r | |
281 | }\r | |
282 | \r | |
283 | /**\r | |
284 | Timeout handler for FIN_WAIT_2 timer.\r | |
285 | \r | |
286 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
287 | \r | |
288 | **/\r | |
289 | VOID\r | |
290 | TcpFinwait2Timeout (\r | |
291 | IN OUT TCP_CB *Tcb\r | |
292 | )\r | |
293 | {\r | |
294 | DEBUG (\r | |
295 | (DEBUG_WARN,\r | |
296 | "TcpFinwait2Timeout: connection closed because FIN_WAIT2 timer timeouts for TCB %p\n",\r | |
297 | Tcb)\r | |
298 | );\r | |
299 | \r | |
300 | TcpClose (Tcb);\r | |
301 | }\r | |
302 | \r | |
303 | /**\r | |
304 | Timeout handler for 2MSL timer.\r | |
305 | \r | |
306 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
307 | \r | |
308 | **/\r | |
309 | VOID\r | |
310 | Tcp2MSLTimeout (\r | |
311 | IN OUT TCP_CB *Tcb\r | |
312 | )\r | |
313 | {\r | |
314 | DEBUG (\r | |
315 | (DEBUG_WARN,\r | |
316 | "Tcp2MSLTimeout: connection closed because TIME_WAIT timer timeouts for TCB %p\n",\r | |
317 | Tcb)\r | |
318 | );\r | |
319 | \r | |
320 | TcpClose (Tcb);\r | |
321 | }\r | |
322 | \r | |
323 | /**\r | |
324 | Update the timer status and the next expire time according to the timers\r | |
325 | to expire in a specific future time slot.\r | |
326 | \r | |
327 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
328 | \r | |
329 | **/\r | |
330 | VOID\r | |
331 | TcpUpdateTimer (\r | |
332 | IN OUT TCP_CB *Tcb\r | |
333 | )\r | |
334 | {\r | |
335 | UINT16 Index;\r | |
336 | \r | |
337 | //\r | |
338 | // Don't use a too large value to init NextExpire\r | |
339 | // since mTcpTick wraps around as sequence no does.\r | |
340 | //\r | |
341 | Tcb->NextExpire = TCP_EXPIRE_TIME;\r | |
342 | TCP_CLEAR_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);\r | |
343 | \r | |
344 | for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {\r | |
345 | if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) &&\r | |
346 | TCP_TIME_LT (Tcb->Timer[Index], mTcpTick + Tcb->NextExpire)\r | |
347 | )\r | |
348 | {\r | |
349 | Tcb->NextExpire = TCP_SUB_TIME (Tcb->Timer[Index], mTcpTick);\r | |
350 | TCP_SET_FLG (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON);\r | |
351 | }\r | |
352 | }\r | |
353 | }\r | |
354 | \r | |
355 | /**\r | |
356 | Enable a TCP timer.\r | |
357 | \r | |
358 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
359 | @param[in] Timer The index of the timer to be enabled.\r | |
360 | @param[in] TimeOut The timeout value of this timer.\r | |
361 | \r | |
362 | **/\r | |
363 | VOID\r | |
364 | TcpSetTimer (\r | |
365 | IN OUT TCP_CB *Tcb,\r | |
366 | IN UINT16 Timer,\r | |
367 | IN UINT32 TimeOut\r | |
368 | )\r | |
369 | {\r | |
370 | TCP_SET_TIMER (Tcb->EnabledTimer, Timer);\r | |
371 | Tcb->Timer[Timer] = mTcpTick + TimeOut;\r | |
372 | \r | |
373 | TcpUpdateTimer (Tcb);\r | |
374 | }\r | |
375 | \r | |
376 | /**\r | |
377 | Clear one TCP timer.\r | |
378 | \r | |
379 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
380 | @param[in] Timer The index of the timer to be cleared.\r | |
381 | \r | |
382 | **/\r | |
383 | VOID\r | |
384 | TcpClearTimer (\r | |
385 | IN OUT TCP_CB *Tcb,\r | |
386 | IN UINT16 Timer\r | |
387 | )\r | |
388 | {\r | |
389 | TCP_CLEAR_TIMER (Tcb->EnabledTimer, Timer);\r | |
390 | TcpUpdateTimer (Tcb);\r | |
391 | }\r | |
392 | \r | |
393 | /**\r | |
394 | Clear all TCP timers.\r | |
395 | \r | |
396 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
397 | \r | |
398 | **/\r | |
399 | VOID\r | |
400 | TcpClearAllTimer (\r | |
401 | IN OUT TCP_CB *Tcb\r | |
402 | )\r | |
403 | {\r | |
404 | Tcb->EnabledTimer = 0;\r | |
405 | TcpUpdateTimer (Tcb);\r | |
406 | }\r | |
407 | \r | |
408 | /**\r | |
409 | Enable the window prober timer and set the timeout value.\r | |
410 | \r | |
411 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
412 | \r | |
413 | **/\r | |
414 | VOID\r | |
415 | TcpSetProbeTimer (\r | |
416 | IN OUT TCP_CB *Tcb\r | |
417 | )\r | |
418 | {\r | |
419 | if (!Tcb->ProbeTimerOn) {\r | |
420 | Tcb->ProbeTime = Tcb->Rto;\r | |
421 | Tcb->ProbeTimerOn = TRUE;\r | |
422 | } else {\r | |
423 | Tcb->ProbeTime <<= 1;\r | |
424 | }\r | |
425 | \r | |
426 | if (Tcb->ProbeTime < TCP_RTO_MIN) {\r | |
427 | Tcb->ProbeTime = TCP_RTO_MIN;\r | |
428 | } else if (Tcb->ProbeTime > TCP_RTO_MAX) {\r | |
429 | Tcb->ProbeTime = TCP_RTO_MAX;\r | |
430 | }\r | |
431 | \r | |
432 | TcpSetTimer (Tcb, TCP_TIMER_PROBE, Tcb->ProbeTime);\r | |
433 | }\r | |
434 | \r | |
435 | /**\r | |
436 | Enable the keepalive timer and set the timeout value.\r | |
437 | \r | |
438 | @param[in, out] Tcb Pointer to the TCP_CB of this TCP instance.\r | |
439 | \r | |
440 | **/\r | |
441 | VOID\r | |
442 | TcpSetKeepaliveTimer (\r | |
443 | IN OUT TCP_CB *Tcb\r | |
444 | )\r | |
445 | {\r | |
446 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_NO_KEEPALIVE)) {\r | |
447 | return;\r | |
448 | }\r | |
449 | \r | |
450 | //\r | |
451 | // Set the timer to KeepAliveIdle if either\r | |
452 | // 1. the keepalive timer is off\r | |
453 | // 2. The keepalive timer is on, but the idle\r | |
454 | // is less than KeepAliveIdle, that means the\r | |
455 | // connection is alive since our last probe.\r | |
456 | //\r | |
457 | if (!TCP_TIMER_ON (Tcb->EnabledTimer, TCP_TIMER_KEEPALIVE) ||\r | |
458 | (Tcb->Idle < Tcb->KeepAliveIdle)\r | |
459 | )\r | |
460 | {\r | |
461 | TcpSetTimer (Tcb, TCP_TIMER_KEEPALIVE, Tcb->KeepAliveIdle);\r | |
462 | Tcb->KeepAliveProbes = 0;\r | |
463 | } else {\r | |
464 | TcpSetTimer (Tcb, TCP_TIMER_KEEPALIVE, Tcb->KeepAlivePeriod);\r | |
465 | }\r | |
466 | }\r | |
467 | \r | |
468 | /**\r | |
469 | Heart beat timer handler.\r | |
470 | \r | |
471 | @param[in] Context Context of the timer event, ignored.\r | |
472 | \r | |
473 | **/\r | |
474 | VOID\r | |
475 | EFIAPI\r | |
476 | TcpTickingDpc (\r | |
477 | IN VOID *Context\r | |
478 | )\r | |
479 | {\r | |
480 | LIST_ENTRY *Entry;\r | |
481 | LIST_ENTRY *Next;\r | |
482 | TCP_CB *Tcb;\r | |
483 | INT16 Index;\r | |
484 | \r | |
485 | mTcpTick++;\r | |
486 | mTcpGlobalIss += TCP_ISS_INCREMENT_2;\r | |
487 | \r | |
488 | //\r | |
489 | // Don't use LIST_FOR_EACH, which isn't delete safe.\r | |
490 | //\r | |
491 | for (Entry = mTcpRunQue.ForwardLink; Entry != &mTcpRunQue; Entry = Next) {\r | |
492 | Next = Entry->ForwardLink;\r | |
493 | \r | |
494 | Tcb = NET_LIST_USER_STRUCT (Entry, TCP_CB, List);\r | |
495 | \r | |
496 | if (Tcb->State == TCP_CLOSED) {\r | |
497 | continue;\r | |
498 | }\r | |
499 | \r | |
500 | //\r | |
501 | // The connection is doing RTT measurement.\r | |
502 | //\r | |
503 | if (TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_RTT_ON)) {\r | |
504 | Tcb->RttMeasure++;\r | |
505 | }\r | |
506 | \r | |
507 | Tcb->Idle++;\r | |
508 | \r | |
509 | if (Tcb->DelayedAck != 0) {\r | |
510 | TcpSendAck (Tcb);\r | |
511 | }\r | |
512 | \r | |
513 | if ((Tcb->IpInfo->IpVersion == IP_VERSION_6) && (Tcb->Tick > 0)) {\r | |
514 | Tcb->Tick--;\r | |
515 | }\r | |
516 | \r | |
517 | //\r | |
518 | // No timer is active or no timer expired\r | |
519 | //\r | |
520 | if (!TCP_FLG_ON (Tcb->CtrlFlag, TCP_CTRL_TIMER_ON) || ((--Tcb->NextExpire) > 0)) {\r | |
521 | continue;\r | |
522 | }\r | |
523 | \r | |
524 | //\r | |
525 | // Call the timeout handler for each expired timer.\r | |
526 | //\r | |
527 | for (Index = 0; Index < TCP_TIMER_NUMBER; Index++) {\r | |
528 | if (TCP_TIMER_ON (Tcb->EnabledTimer, Index) && TCP_TIME_LEQ (Tcb->Timer[Index], mTcpTick)) {\r | |
529 | //\r | |
530 | // disable the timer before calling the handler\r | |
531 | // in case the handler enables it again.\r | |
532 | //\r | |
533 | TCP_CLEAR_TIMER (Tcb->EnabledTimer, Index);\r | |
534 | mTcpTimerHandler[Index](Tcb);\r | |
535 | \r | |
536 | //\r | |
537 | // The Tcb may have been deleted by the timer, or\r | |
538 | // no other timer is set.\r | |
539 | //\r | |
540 | if ((Next->BackLink != Entry) || (Tcb->EnabledTimer == 0)) {\r | |
541 | break;\r | |
542 | }\r | |
543 | }\r | |
544 | }\r | |
545 | \r | |
546 | //\r | |
547 | // If the Tcb still exist or some timer is set, update the timer\r | |
548 | //\r | |
549 | if (Index == TCP_TIMER_NUMBER) {\r | |
550 | TcpUpdateTimer (Tcb);\r | |
551 | }\r | |
552 | }\r | |
553 | }\r | |
554 | \r | |
555 | /**\r | |
556 | Heart beat timer handler, queues the DPC at TPL_CALLBACK.\r | |
557 | \r | |
558 | @param[in] Event Timer event signaled, ignored.\r | |
559 | @param[in] Context Context of the timer event, ignored.\r | |
560 | \r | |
561 | **/\r | |
562 | VOID\r | |
563 | EFIAPI\r | |
564 | TcpTicking (\r | |
565 | IN EFI_EVENT Event,\r | |
566 | IN VOID *Context\r | |
567 | )\r | |
568 | {\r | |
569 | QueueDpc (TPL_CALLBACK, TcpTickingDpc, Context);\r | |
570 | }\r |