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Cleanup NBL reference counting

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The Empty event state is now set according to
Ctx->Device.Receive.ActiveNbls.Head != NULL. But, we still have to clear
the Empty event inside the TransitionLock to prevent race with
TunPause().

Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-08-02 12:03:10 +02:00
parent 408665270f
commit cd6fe285b4
1 changed files with 25 additions and 39 deletions
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56
wintun.c
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@ -150,7 +150,6 @@ typedef struct _TUN_CTX
struct
{
NET_BUFFER_LIST *Head, *Tail;
volatile LONG64 Count;
KEVENT Empty;
} ActiveNbls;
} Receive;
@ -351,11 +350,6 @@ TunCancelSend(NDIS_HANDLE MiniportAdapterContext, PVOID CancelId)
* MINIPORT_RETURN_NET_BUFFER_LISTS calls. Therefore, we use our own ->Next pointer for book-keeping. */
#define NET_BUFFER_LIST_NEXT_NBL_EX(Nbl) (NET_BUFFER_LIST_MINIPORT_RESERVED(Nbl)[1])
/* Wintun-specific MINIPORT_RETURN_NET_BUFFER_LISTS return flag to indicate the NBL was not really sent to NDIS and
* the receiver thread is calling the MINIPORT_RETURN_NET_BUFFER_LISTS handler manualy to perform regular NBL's
* post-processing. Must not overlap any of the standard NDIS_RETURN_FLAGS_* values. */
#define TUN_RETURN_FLAGS_DISCARD 0x00010000
static MINIPORT_RETURN_NET_BUFFER_LISTS TunReturnNetBufferLists;
_Use_decl_annotations_
static VOID
@ -363,15 +357,12 @@ TunReturnNetBufferLists(NDIS_HANDLE MiniportAdapterContext, PNET_BUFFER_LIST Net
{
TUN_CTX *Ctx = (TUN_CTX *)MiniportAdapterContext;
TUN_RING *Ring = Ctx->Device.Receive.Ring;
BOOLEAN WasNdisIndicated = !(ReturnFlags & TUN_RETURN_FLAGS_DISCARD);
LONG64 ReceivedPacketsCount = 0, ReceivedPacketsSize = 0, ErrorPacketsCount = 0, DiscardedPacketsCount = 0;
LONG64 ReceivedPacketsCount = 0, ReceivedPacketsSize = 0, ErrorPacketsCount = 0;
for (NET_BUFFER_LIST *Nbl = NetBufferLists, *NextNbl; Nbl; Nbl = NextNbl)
{
NextNbl = NET_BUFFER_LIST_NEXT_NBL(Nbl);
if (WasNdisIndicated)
{
if (NT_SUCCESS(NET_BUFFER_LIST_STATUS(Nbl)))
{
ReceivedPacketsCount++;
@ -379,9 +370,6 @@ TunReturnNetBufferLists(NDIS_HANDLE MiniportAdapterContext, PNET_BUFFER_LIST Net
}
else
ErrorPacketsCount++;
}
else
DiscardedPacketsCount++;
TunNblMarkCompleted(Nbl);
for (;;)
@ -395,20 +383,18 @@ TunReturnNetBufferLists(NDIS_HANDLE MiniportAdapterContext, PNET_BUFFER_LIST Net
break;
}
Ctx->Device.Receive.ActiveNbls.Head = NET_BUFFER_LIST_NEXT_NBL_EX(CompletedNbl);
if (!Ctx->Device.Receive.ActiveNbls.Head)
KeSetEvent(&Ctx->Device.Receive.ActiveNbls.Empty, IO_NO_INCREMENT, FALSE);
KeReleaseInStackQueuedSpinLock(&LockHandle);
InterlockedSetU(&Ring->Head, TunNblGetOffset(CompletedNbl));
NdisFreeNetBufferList(CompletedNbl);
}
if (WasNdisIndicated && InterlockedDecrement64(&Ctx->Device.Receive.ActiveNbls.Count) <= 0)
KeSetEvent(&Ctx->Device.Receive.ActiveNbls.Empty, IO_NO_INCREMENT, FALSE);
}
InterlockedAdd64((LONG64 *)&Ctx->Statistics.ifHCInOctets, ReceivedPacketsSize);
InterlockedAdd64((LONG64 *)&Ctx->Statistics.ifHCInUcastOctets, ReceivedPacketsSize);
InterlockedAdd64((LONG64 *)&Ctx->Statistics.ifHCInUcastPkts, ReceivedPacketsCount);
InterlockedAdd64((LONG64 *)&Ctx->Statistics.ifInErrors, ErrorPacketsCount);
InterlockedAdd64((LONG64 *)&Ctx->Statistics.ifInDiscards, DiscardedPacketsCount);
}
_IRQL_requires_max_(PASSIVE_LEVEL)
@ -501,31 +487,28 @@ TunProcessReceiveData(_Inout_ TUN_CTX *Ctx)
NET_BUFFER_LIST *Nbl = NdisAllocateNetBufferAndNetBufferList(
Ctx->NblPool, 0, 0, Ctx->Device.Receive.Mdl, (ULONG)(Packet->Data - (UCHAR *)Ring), PacketSize);
if (!Nbl)
{
InterlockedIncrement64((LONG64 *)&Ctx->Statistics.ifInDiscards);
KeWaitForSingleObject(&Ctx->Device.Receive.ActiveNbls.Empty, Executive, KernelMode, FALSE, NULL);
InterlockedSetU(&Ring->Head, RingHead);
continue;
}
goto skipNbl;
Nbl->SourceHandle = Ctx->MiniportAdapterHandle;
NdisSetNblFlag(Nbl, NblFlags);
NET_BUFFER_LIST_INFO(Nbl, NetBufferListFrameType) = (PVOID)NblProto;
NET_BUFFER_LIST_STATUS(Nbl) = NDIS_STATUS_SUCCESS;
TunNblSetOffsetAndMarkActive(Nbl, RingHead);
KLOCK_QUEUE_HANDLE LockHandle;
KeAcquireInStackQueuedSpinLock(&Ctx->Device.Receive.Lock, &LockHandle);
*(Ctx->Device.Receive.ActiveNbls.Head ? &NET_BUFFER_LIST_NEXT_NBL_EX(Ctx->Device.Receive.ActiveNbls.Tail)
: &Ctx->Device.Receive.ActiveNbls.Head) = Nbl;
Ctx->Device.Receive.ActiveNbls.Tail = Nbl;
KeReleaseInStackQueuedSpinLock(&LockHandle);
KIRQL Irql = ExAcquireSpinLockShared(&Ctx->TransitionLock);
if (!InterlockedGet(&Ctx->Running))
goto skipNbl;
goto cleanupNbl;
if (InterlockedIncrement64(&Ctx->Device.Receive.ActiveNbls.Count) == 1)
KLOCK_QUEUE_HANDLE LockHandle;
KeAcquireInStackQueuedSpinLock(&Ctx->Device.Receive.Lock, &LockHandle);
if (Ctx->Device.Receive.ActiveNbls.Head)
NET_BUFFER_LIST_NEXT_NBL_EX(Ctx->Device.Receive.ActiveNbls.Tail) = Nbl;
else
{
KeClearEvent(&Ctx->Device.Receive.ActiveNbls.Empty);
Ctx->Device.Receive.ActiveNbls.Head = Nbl;
}
Ctx->Device.Receive.ActiveNbls.Tail = Nbl;
KeReleaseInStackQueuedSpinLock(&LockHandle);
NdisMIndicateReceiveNetBufferLists(
Ctx->MiniportAdapterHandle,
@ -537,10 +520,13 @@ TunProcessReceiveData(_Inout_ TUN_CTX *Ctx)
ExReleaseSpinLockShared(&Ctx->TransitionLock, Irql);
continue;
skipNbl:
NET_BUFFER_LIST_NEXT_NBL(Nbl) = NULL;
TunReturnNetBufferLists(Ctx, Nbl, TUN_RETURN_FLAGS_DISCARD);
cleanupNbl:
ExReleaseSpinLockShared(&Ctx->TransitionLock, Irql);
NdisFreeNetBufferList(Nbl);
skipNbl:
InterlockedIncrement64((LONG64 *)&Ctx->Statistics.ifInDiscards);
KeWaitForSingleObject(&Ctx->Device.Receive.ActiveNbls.Empty, Executive, KernelMode, FALSE, NULL);
InterlockedSetU(&Ring->Head, RingHead);
}
/* Wait for all NBLs to return: 1. To prevent race between proceeding and invalidating ring head. 2. To have