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Fix to tap reset code in Windows tap connector.

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This commit is contained in:
Adam Ierymenko 2015-05-08 16:49:08 -07:00
parent e744580b89
commit 241f308334
1 changed files with 13 additions and 7 deletions
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20
osdep/WindowsEthernetTap.cpp
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@ -92,10 +92,8 @@ static const WindowsEthernetTapEnv WINENV;
// Only create or delete devices one at a time
static Mutex _systemTapInitLock;
// Set to true if existing taps should close and reopen due to new device creation
// This is a hack to get around what seems to be a bug that causes existing
// devices to go into a coma after new device creation.
static volatile bool _needReset = false;
// Incrementing this causes everyone currently open to close and reopen
static volatile int _systemTapResetStatus = 0;
} // anonymous namespace
@ -271,8 +269,11 @@ WindowsEthernetTap::WindowsEthernetTap(
} else break; // no more keys or error occurred
}
// Cause all existing taps to reset
_needReset = true;
// When we create a new tap device from scratch, existing taps for
// some reason go into 'unplugged' state. This can be fixed by
// closing and re-opening them. Incrementing this causes all
// existing tap threads to do this.
++_systemTapResetStatus;
}
if (_netCfgInstanceId.length() > 0) {
@ -592,6 +593,7 @@ void WindowsEthernetTap::threadMain()
}
Utils::snprintf(tapPath,sizeof(tapPath),"\\\\.\\Global\\%s.tap",_netCfgInstanceId.c_str());
int prevTapResetStatus = _systemTapResetStatus;
while (_run) {
_tap = CreateFileA(tapPath,GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_SYSTEM|FILE_FLAG_OVERLAPPED,NULL);
if (_tap == INVALID_HANDLE_VALUE) {
@ -695,7 +697,11 @@ void WindowsEthernetTap::threadMain()
ReadFile(_tap,tapReadBuf,sizeof(tapReadBuf),NULL,&tapOvlRead);
bool writeInProgress = false;
while ((_run)&&(!_needReset)) {
while (_run) {
if (prevTapResetStatus != _systemTapResetStatus) {
prevTapResetStatus = _systemTapResetStatus;
break; // this will cause us to close and reopen the tap
}
DWORD r = WaitForMultipleObjectsEx(writeInProgress ? 3 : 2,wait4,FALSE,2500,TRUE);
if (!_run) break; // will also break outer while(_run)