NDIS_TASK_TCP_IP_CHECKSUM

When supplied by a miniport driver in response to a query of OID_TCP_TASK_OFFLOAD, the NDIS_TASK_TCP_IP_CHECKSUM structure specifies the miniport driver's NIC's capabilities for calculating IP, TCP, and/or UDP checksums for send packets and validating such checksums for receive packets. When passed to a miniport driver in a set of OID_TCP_TASK_OFFLOAD, the structure specifies the checksum capabilities that the TCP/IP transport is enabling for the NIC.

typedef struct _NDIS_TASK_TCP_IP_CHECKSUM
{
  struct
  {
    ULONG    IpOptionsSupported:1;
    ULONG    TcpOptionsSupported:1;
    ULONG    TcpChecksum:1;
    ULONG    UdpChecksum:1;
    ULONG    IpChecksum:1;
  } V4Transmit;
 
  struct
  {
    ULONG    IpOptionsSupported:1;
    ULONG    TcpOptionsSupported:1;
    ULONG    TcpChecksum:1;
    ULONG    UdpChecksum:1;
    ULONG    IpChecksum:1;
  } V4Receive;
 
  struct
  {
    ULONG    IpOptionsSupported:1;
    ULONG    TcpOptionsSupported:1;
    ULONG    TcpChecksum:1;
    ULONG    UdpChecksum:1;
  } V6Transmit;
 
  struct
  {
    ULONG    IpOptionsSupported:1;
    ULONG    TcpOptionsSupported:1;
    ULONG    TcpChecksum:1;
    ULONG    UdpChecksum:1;
  } V6Receive;
} NDIS_TASK_TCP_IP_CHECKSUM, *PNDIS_TASK_TCP_IP_CHECKSUM;

Members

V4Transmit
IpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate an IP checksum for an IPv4 send packet that contains IP options.
TcpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate a TCP checksum for an IPv4 send packet that contains TCP options.
TcpChecksum: Set by a miniport driver to indicate that its NIC can calculate a TCP checksum for an IPv4 send packet. Set by the TCP/IP transport to enable this capability.
UdpChecksum: Set by a miniport driver to indicate that its NIC can calculate a UDP checksum for an IPv4 send packet. Set by the TCP/IP transport to enable this capability.
IpChecksum: Set by a miniport driver to indicate that its NIC can calculate an IP checksum for an IPv4 send packet. Set by the TCP/IP transport to enable this capability.
V4Receive
IpOptionsSupported: Set by a miniport driver to indicate that its NIC can validate an IP checksum for an IPv4 receive packet that contains IP options.
TcpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate a TCP checksum for an IPv4 receive packet that contains TCP options.
TcpChecksum: Set by a miniport driver to indicate that its NIC can validate the TCP checksum for an IPv4 receive packet. Set by the TCP/IP transport to enable this capability.
UdpChecksum: Set by a miniport driver to indicate that its NIC can validate an IPv4 receive packet's UDP checksum. Set by the TCP/IP transport to enable this capability.
IpChecksum: Set by a miniport driver to indicate that its NIC can validate an IP checksum for an IPv4 receive packet. Set by the TCP/IP transport to enable this capability.
V6Transmit
IpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate an IP checksum for an IPv6 send packet that contains IP options.
TcpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate a TCP checksum for an IPv6 send packet that contains TCP options.
TcpChecksum: Set by a miniport driver to indicate that its NIC can calculate a TCP checksum for an IPv6 send packet. Set by the TCP/IP transport to enable this capability.
UdpChecksum: Set by a miniport driver to indicate that its NIC can calculate a UDP checksum for an IPv6 send packet. Set by the TCP/IP transport to enable this capability.
V6Receive
IpOptionsSupported: Set by a miniport driver to indicate that its NIC can validate IP checksum(s) for an IPv6 receive packet whose IP header(s) contains IP options.
TcpOptionsSupported: Set by a miniport driver to indicate that its NIC can calculate a checksum for an IPv6 receive packet whose TCP header contains TCP options.
TcpChecksum: Set by a miniport driver to indicate that its NIC can validate an IPv6 receive packet's TCP checksum. Set by the TCP/IP transport to enable this capability.
UdpChecksum: Set by a miniport driver to indicate that its NIC can validate a UDP checksum for an IPv6 receive packet. Set by the TCP/IP transport to enable this capability.

Headers

Declared in ndis.h. Include ndis.h.

Comments

In response to a query of OID_TCP_TASK_OFFLOAD, a miniport driver returns in the InformationBuffer an NDIS_TASK_OFFLOAD_HEADER structure followed immediately by one or more chained NDIS_TASK_OFFLOAD structures. Each NDIS_TASK_OFFLOAD structure specifies a task-offload capability supported by the miniport driver's NIC.

When the Task member of the NDIS_TASK_OFFLOAD structure specifies TcpIpChecksumNdisTask, the TaskBuffer of the NDIS_TASK_OFFLOAD structure contains an NDIS_TASK_TCP_IP_CHECKSUM structure.

When returned by a miniport driver in response to the TCP/IP transport's query of OID_TCP_TASK_OFFLOAD, the NDIS_TASK_TCP_IP_CHECKSUM structure specifies the miniport driver's capabilities for performing checksum tasks on both send and receive packets. When passed to a miniport driver by the TCP/IP transport's set of OID_TCP_TASK_OFFLOAD, the NDIS_TASK_TCP_IP_CHECKSUM structure specifies the checksum capabilities that the transport is enabling.

The NDIS_TASK_TCP_IP_CHECKSUM structure allows a miniport driver to indicate UDP checksum capabilities. The initial release of Windows® 2000 does not support UDP checksum offloads; however, future service packs and update releases of Windows 2000 may support UDP checksum offloads.

The NDIS_TASK_TCP_IP_CHECKSUM structure also allows a miniport driver to indicate checksum capabilities for IPv6 packets. The TCP/IP transport in the initial release of Windows 2000, however, can process only IPv4 packets and therefore does not enable any IPv6 checksum capabilities reported by a miniport driver. Future versions of the TCP/IP transport may support the processing of IPv6 packets.

NDIS_TASK_TCP_IP_CHECKSUM

Members

Headers

Comments

See Also