82583V Datasheet, PDF (155/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Inline Functions—82583V GbE Controller
Note:
7.3.3
Frame formats supported by the 82583V include:
• Ethernet 802.3
• IEEE 802.1q VLAN (Ethernet 802.3ac)
• Ethernet Type 2
• Ethernet SNAP
• IPv4 headers with options
• IPv6 headers with IP option next headers
• TCP with options
• UDP with options
VLAN tag insertion is handled by hardware.
IP tunneled packets are not supported for TSO operation.
Once the TCP segmentation context has been set, the next descriptor provides the
initial data to transfer. This first descriptor(s must point to a packet of the type
indicated. Furthermore, the data it points to might need to be modified by software as
it serves as the prototype (partial pseudo-header) header for all packets within the TCP
segmentation context. The following sections describe the supported packet types and
the various updates which are performed by hardware. This should be used as a guide
to determine what must be modified in the original packet header to make it a suitable
prototype (partial pseudo-header) header.
TCP Segmentation Data Descriptors
The TCP segmentation data descriptor is the companion to the TCP segmentation
context descriptor described in the previous section. For a complete description of the
descriptor please refer to section 7.2.10.
To select this descriptor format, bit 29 (TDESC.DEXT) must be set to 1b and
TDESC.DTYP must be set to 0x0001.
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