NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// netadapteroffload.h
typedef struct _NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES {
ULONG Size;
NET_ADAPTER_OFFLOAD_LAYER3_FLAGS Layer3Flags;
NET_ADAPTER_OFFLOAD_LAYER4_FLAGS Layer4Flags;
UINT16 Layer3HeaderOffsetLimit;
UINT16 Layer4HeaderOffsetLimit;
PFN_NET_ADAPTER_OFFLOAD_SET_TX_CHECKSUM EvtAdapterOffloadSetTxChecksum;
} NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES;
View the official Windows Driver Kit DDI referenceNo description available.
The NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES structure describes a network interface card (NIC)'s Tx checksum offload capabilities.
SizeThe size of this structure in bytes.
Layer3FlagsFlags specifying the layer 3 protocol variations that the NIC can successfully perform Tx checksum on.
The flags should be a combination of:
| Flag | Description |
|---|---|
| NetAdapterOffloadLayer3FlagIPv4NoOptions | Set if the NIC is capable of performing IPv4 checksum offload or TCP/UDP checksum offload on IPv4 packets without options |
| NetAdapterOffloadLayer3FlagIPv4WithOptions | Set if the NIC is capable of performing Tx checksum offload on IPv4 packets with options |
| NetAdapterOffloadLayer3FlagIPv6NoExtensions | Set if the NIC is capable of performing Tx checksum offload on IPv6 packets without extensions |
| NetAdapterOffloadLayer3FlagIPv6WithExtensions | Set if the NIC is capable of performing Tx checksum offload on IPv6 packets with extensions |
Layer4FlagsFlags specifying the layer 4 protocol variations that the NIC can successfully perform Tx checksum on. This member is optional.
The flags should be a combination of:
| Flag | Description |
|---|---|
| NetAdapterOffloadLayer4FlagTcpNoOptions | Set if the NIC is capable of performing TCP checksum offload |
| NetAdapterOffloadLayer4FlagTcpWithOptions | Set if the NIC is capable of performing Tx checksum offload on TCP packets with options |
| NetAdapterOffloadLayer4FlagUdp | Set if the NIC is capable of performing UDP checksum offload |
Layer3HeaderOffsetLimitThe maximum layer 3 header offset that the NIC supports in bytes. This member is optional.
Layer4HeaderOffsetLimitThe maximum layer 4 header offset that the NIC supports in bytes. This member is optional.
EvtAdapterOffloadSetTxChecksumA pointer to the client driver's implementation of the EVT_NET_ADAPTER_OFFLOAD_SET_TX_CHECKSUM callback function.
Call NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES_INIT to initialize this structure. The client driver passes an initialized NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES structure as a parameter to NetAdapterOffloadSetTxChecksumCapabilities.
EVT_NET_ADAPTER_OFFLOAD_SET_TX_CHECKSUM
NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES_INIT
NetAdapterOffloadSetTxChecksumCapabilities