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A network card with hardware support for certain acceleration features (in this case, the Large Send Offload feature), and; the Windows Firewall. For send operation scatter-gather mode is a default, it can be disabled by configuration to force copy mode to preallocated buffers. NDIS driver can declare following types of TX checksum offload. NDIS does not initialize IP header checksum, device/driver fill it. Netkvm.inf, INF file for Vista/2008.

The NDIS_OFFLOAD structure specifies several computational tasks that can be offloaded to the network adapter.

Syntax

Members

Header

TheNDIS_OBJECT_HEADER structure for theNDIS_OFFLOAD structure. Set theType member of the structure thatHeader specifies to NDIS_OBJECT_TYPE_OFFLOAD.

Set the Revision and Size members of the NDIS_OBJECT_HEADER structure as follows:

• For NDIS 6.70 and later drivers:
  • Set Revision to NDIS_OFFLOAD_REVISION_5 (NDIS 6.70).
  • Set Size to NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_5.
• For NDIS 6.50 and later drivers:
  • Set Revision to NDIS_OFFLOAD_REVISION_4 (NDIS 6.50).
  • Set Size to NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_4.
• For NDIS 6.30 and later drivers:
  • Set Revision to NDIS_OFFLOAD_REVISION_3 (NDIS 6.30).
  • Set Size to NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_3.
• For NDIS 6.1 and 6.20 drivers:
  • Set Revision to NDIS_OFFLOAD_REVISION_2 (NDIS 6.1).
  • Set Size to NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_2.
• For NDIS 6.0 drivers:
  • Set Revision to NDIS_OFFLOAD_REVISION_1 (NDIS 6.0).
  • Set Size to NDIS_SIZEOF_NDIS_OFFLOAD_REVISION_1.

Checksum

Checksum offload information in anNDIS_TCP_IP_CHECKSUM_OFFLOAD structure.

LsoV1

Large send offload version 1 (LSOV1) information in anNDIS_TCP_LARGE_SEND_OFFLOAD_V1 structure.

IPsecV1

Internet protocol security (IPsec) offload information in anNDIS_IPSEC_OFFLOAD_V1 structure.

LsoV2

Large send offload version 2 (LSOV2) offload information in anNDIS_TCP_LARGE_SEND_OFFLOAD_V2 structure.

Flags

A bitwise OR of flags that specify properties that the network adapter supports. The following flags are defined.

Value	Meaning
IPSEC_OFFLOAD_V2_AND_TCP_CHECKSUM_COEXISTENCE 0x00000002	The network adapter supports IPsecV2 and TCP checksums.
IPSEC_OFFLOAD_V2_AND_UDP_CHECKSUM_COEXISTENCE 0x00000004	The network adapter supports IPsecV2 and UDP checksums.

IPsecV2

Internet protocol security (IPsec) offload version 2 information in anNDIS_IPSEC_OFFLOAD_V2 structure.

Many services you use every day are a part of the cloud—everything from web-based email to mobile banking and online photo storage. Microsoft office 2007 blue edition - working tested 2017. When you use cloud-based services, your IT infrastructure resides off your property (off-premises), and is maintained by a third party (hosted), instead of residing on a server at your home or business (on-premises) that you maintain. With Office 365, for example, information storage, computation, and software are located and managed remotely on servers owned by Microsoft. “The cloud” is a friendly way of describing web-based computing services that are hosted outside of your home or organization.

Rsc

Receive Segment Coalescing (RSC) offload information in an NDIS_TCP_RECV_SEG_COALESCE_OFFLOAD structure.

EncapsulatedPacketTaskOffloadGre

Network Virtualization using Generic Routing Encapsulation (NVGRE) Task Offload information in an NDIS_ENCAPSULATED_PACKET_TASK_OFFLOAD structure. Numark cue update. This member should only be set by miniport drivers that support task offloads for NVGRE-formatted packets.

EncapsulatedPacketTaskOffloadVxlan

VXLAN encapsulated packet task offload information in an NDIS_ENCAPSULATED_PACKET_TASK_OFFLOAD_V2 structure. This member should only be set by miniport drivers that support task offloads for VXLAN-formatted packets. VXLAN is similar to NVGRE, but with a different protocol.

EncapsulationTypes

The enabled encapsulation types for encapsulated packet task offload.

Rfc6877Xlat

464XLAT hardware offload information in an NDIS_RFC6877_464XLAT_OFFLOAD structure.

UdpSegmentation

Remarks

The NDIS_OFFLOAD structure is used in the following places:

• The DefaultOffloadConfiguration member of the NDIS_MINIPORT_ADAPTER_OFFLOAD_ATTRIBUTES structure
• The DefaultOffloadConfiguration member of the NDIS_BIND_PARAMETERS structure
• The DefaultOffloadConfiguration member of the NDIS_FILTER_ATTACH_PARAMETERS structure
• The InformationBuffer member of the NDIS_OID_REQUEST structure (which is used in the OID_TCP_OFFLOAD_CURRENT_CONFIG OID request)
• The StatusBuffer member of the NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG status indication

Requirements

Minimum supported client	Windows Vista,Supported in NDIS 6.0 and later.
Minimum supported server	Windows Server 2008
Header	ntddndis.h (include Ndis.h)

See also

NDIS_MINIPORT_ADAPTER_OFFLOAD_ATTRIBUTES NDIS_STATUS_TASK_OFFLOAD_CURRENT_CONFIG NDIS_TCP_LARGE_SEND_OFFLOAD_V1 NDIS_TCP_LARGE_SEND_OFFLOAD_V2-->

To increase its performance, the Microsoft TCP/IP transport can offload tasks or connections to a NIC that has the appropriate TCP/IP-offload capabilities.

Beginning with Windows Vista, the Windows operating system supports the following TCP/IP offload services:

• Checksum tasks

• Applications Internet protocol security (IPsec) offload version 1

• IPsec offload version 2

  • [The IPsec Task Offload feature is deprecated and should not be used.]

• Large send offload version 1

• Large send offload version 2

• Connection offload

The TCP/IP transport that is provided beginning with Windows Vista supports TCP/IP offload services for both IPv4 and IPv6 packets.

NDIS 6.0 and later miniport drivers support TCP/IP offload services in a multiple-protocol driver environment. Multiple NDIS 6.0 and later protocol drivers that are bound to a TCP/IP offload-capable miniport adapter can configure TCP/IP offload services.

This section includes: