To configure transmit (Tx) checksum offload, the client driver:Īllocates a NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES structure.Ĭalls NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES_INIT to initialize the structure.Ĭalls NetAdapterOffloadSetTxChecksumCapabilities to register the structure with NetAdapterCx.ĭuring the call to NET_ADAPTER_OFFLOAD_TX_CHECKSUM_CAPABILITIES_INIT the client driver provides a pointer to the EVT_NET_ADAPTER_OFFLOAD_SET_TX_CHECKSUM callback. This might occur within their EvtDevicePrepareHardware callback before starting a net adapter.
#IP CHECKSUM DRIVERS#
Configuring checksum offloadĬlient drivers first advertise their hardware's checksum offload capabilities during net adapter initialization. The keyword values must be of type REG_SZ. The checksum keywords specified in Using Registry Values to Enable and Disable Task Offloading can be used to enable/disable the checksum offload with a registry key setting.
The driver doesn't need to take any further action. NetAdapterCx checks the registry keywords and honors them when enabling the active offload capabilities.
INF keywords for controlling checksum offload To completely disable checksum offloads you must also disable GSO. Turning off checksum offloads when Generic Segmentation Offload (GSO) is enabled doesn't prevent the client driver from computing and inserting checksums in packets generated by the GSO feature. The TCP/IP transport calculates the one's complement sum for the TCP/UDP pseudoheader before offloading the checksum calculation for a TCP/UDP packet, as described in Offloading Checksum Tasks. NetAdapterCx supports offloading TCP/IP checksum tasks at run time.īefore the TCP/IP transport passes a NET_PACKET structure to the client driver, it specifies the checksum information associated with the NET_PACKET in a NET_PACKET_CHECKSUM packet extension. NetAdapterCx is preview only in Windows 10, version 2004.Ĭurrently, NetAdapterCx client drivers cannot be certified. Microsoft makes no warranties, express or implied, with respect to the information provided here. Some information in this topic relates to pre-released product, which may be substantially modified before it's commercially released.
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