static VOID
VifDisable(
IN PXENVIF_VIF_CONTEXT Context
)
{
PXENVIF_FRONTEND Frontend = PdoGetFrontend(Context->Pdo);
KIRQL Irql;
PKEVENT Event;
Trace("====>\n");
AcquireMrswLockExclusive(&Context->Lock, &Irql);
if (!Context->Enabled) {
ReleaseMrswLockExclusive(&Context->Lock, Irql, FALSE);
goto done;
}
Context->Enabled = FALSE;
Event = MacGetEvent(FrontendGetMac(Frontend));
KeSetEvent(Event, IO_NO_INCREMENT, FALSE);
SUSPEND(Deregister,
Context->SuspendInterface,
Context->SuspendCallbackLate);
Context->SuspendCallbackLate = NULL;
SUSPEND(Release, Context->SuspendInterface);
Context->SuspendInterface = NULL;
(VOID) FrontendSetState(Frontend, FRONTEND_CONNECTED);
ReleaseMrswLockExclusive(&Context->Lock, Irql, TRUE);
ReceiverWaitForPackets(FrontendGetReceiver(Frontend));
TransmitterAbortPackets(FrontendGetTransmitter(Frontend));
KeClearEvent(&Context->MonitorEvent);
ThreadWake(Context->MonitorThread);
Trace("waiting for monitor thread\n");
(VOID) KeWaitForSingleObject(&Context->MonitorEvent,
Executive,
KernelMode,
FALSE,
NULL);
RtlZeroMemory(&Context->Callback, sizeof (VIF_CALLBACK));
ReleaseMrswLockShared(&Context->Lock);
done:
Trace("<====\n");
}
DECLSPEC_NOINLINE VOID
PdoD3ToD0(
IN PXENVBD_PDO Pdo
)
{
LogTrace("Target[%d] =====> (Irql=%d)\n", Pdo->Frontend.TargetId, KeGetCurrentIrql());
// connect to backend
FrontendSetState(&Pdo->Frontend, XENVBD_ENABLED);
LogTrace("Target[%d] <===== (Irql=%d)\n", Pdo->Frontend.TargetId, KeGetCurrentIrql());
}
DECLSPEC_NOINLINE VOID
PdoD0ToD3(
IN PXENVBD_PDO Pdo
)
{
LogTrace("Target[%d] =====> (Irql=%d)\n", Pdo->Frontend.TargetId, KeGetCurrentIrql());
// disconnect from backend
FrontendSetState(&Pdo->Frontend, XENVBD_CLOSED);
// target suspended
LogTrace("Target[%d] <===== (Irql=%d)\n", Pdo->Frontend.TargetId, KeGetCurrentIrql());
}
static DECLSPEC_NOINLINE VOID
VifSuspendCallbackLate(
IN PVOID Argument
)
{
PXENVIF_VIF_CONTEXT Context = Argument;
PXENVIF_FRONTEND Frontend = PdoGetFrontend(Context->Pdo);
NTSTATUS status;
status = FrontendSetState(Frontend, FRONTEND_ENABLED);
ASSERT(NT_SUCCESS(status));
TransmitterAdvertizeAddresses(FrontendGetTransmitter(Frontend));
}
static NTSTATUS
VifEnable(
IN PXENVIF_VIF_CONTEXT Context,
IN VOID (*Function)(PVOID, XENVIF_CALLBACK_TYPE, ...),
IN PVOID Argument
)
{
PXENVIF_FRONTEND Frontend = PdoGetFrontend(Context->Pdo);
KIRQL Irql;
PVIF_CALLBACK Callback;
PKEVENT Event;
NTSTATUS status;
Trace("====>\n");
AcquireMrswLockExclusive(&Context->Lock, &Irql);
if (Context->Enabled)
goto done;
Callback = &Context->Callback;
Callback->Function = Function;
Callback->Argument = Argument;
status = FrontendSetState(Frontend, FRONTEND_ENABLED);
if (!NT_SUCCESS(status))
goto fail1;
Context->SuspendInterface = FrontendGetSuspendInterface(Frontend);
SUSPEND(Acquire, Context->SuspendInterface);
status = SUSPEND(Register,
Context->SuspendInterface,
SUSPEND_CALLBACK_LATE,
VifSuspendCallbackLate,
Context,
&Context->SuspendCallbackLate);
if (!NT_SUCCESS(status))
goto fail2;
Context->Enabled = TRUE;
Event = MacGetEvent(FrontendGetMac(Frontend));
KeSetEvent(Event, IO_NO_INCREMENT, FALSE);
done:
ReleaseMrswLockExclusive(&Context->Lock, Irql, FALSE);
Trace("<====\n");
return STATUS_SUCCESS;
fail2:
Error("fail2\n");
SUSPEND(Release, Context->SuspendInterface);
Context->SuspendInterface = NULL;
fail1:
Error("fail1 (%08x)\n", status);
RtlZeroMemory(&Context->Callback, sizeof (VIF_CALLBACK));
ReleaseMrswLockExclusive(&Context->Lock, Irql, FALSE);
return status;
}
