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Create copies of NBLs to complete them faster

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It turns out that waiting for them to come back in the return function
introduces extremely high latency.

We need to eventually stop doing this and move to a proper ring buffer.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-07-03 08:41:37 +00:00
parent b2182e0e90
commit 09dc9324d1
1 changed files with 3 additions and 3 deletions
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6
wintun.c
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@ -909,7 +909,6 @@ TunDispatchWrite(_Inout_ TUN_CTX *Ctx, _Inout_ IRP *Irp)
InterlockedAdd64(&Ctx->ActiveNBLCount, NblCount); InterlockedAdd64(&Ctx->ActiveNBLCount, NblCount);
InterlockedExchange(IRP_REFCOUNT(Irp), NblCount); InterlockedExchange(IRP_REFCOUNT(Irp), NblCount);
IoMarkIrpPending(Irp);
for (EtherTypeIndex Index = EtherTypeIndexStart; Index < EtherTypeIndexEnd; Index++) for (EtherTypeIndex Index = EtherTypeIndexStart; Index < EtherTypeIndexEnd; Index++)
{ {
@ -920,12 +919,13 @@ TunDispatchWrite(_Inout_ TUN_CTX *Ctx, _Inout_ IRP *Irp)
NblQueue[Index].Head, NblQueue[Index].Head,
NDIS_DEFAULT_PORT_NUMBER, NDIS_DEFAULT_PORT_NUMBER,
NblQueue[Index].Count, NblQueue[Index].Count,
NDIS_RECEIVE_FLAGS_SINGLE_ETHER_TYPE | NDIS_RECEIVE_FLAGS_DISPATCH_LEVEL); NDIS_RECEIVE_FLAGS_SINGLE_ETHER_TYPE | NDIS_RECEIVE_FLAGS_DISPATCH_LEVEL | NDIS_RECEIVE_FLAGS_RESOURCES);
TunReturnNetBufferLists((NDIS_HANDLE)Ctx, NblQueue[Index].Head, 0);
} }
ExReleaseSpinLockShared(&Ctx->TransitionLock, Irql); ExReleaseSpinLockShared(&Ctx->TransitionLock, Irql);
TunCompletePause(Ctx, TRUE); TunCompletePause(Ctx, TRUE);
return STATUS_PENDING; return STATUS_SUCCESS;
cleanup_nbl_queues: cleanup_nbl_queues:
for (EtherTypeIndex Index = EtherTypeIndexStart; Index < EtherTypeIndexEnd; Index++) for (EtherTypeIndex Index = EtherTypeIndexStart; Index < EtherTypeIndexEnd; Index++)