82583V Datasheet, PDF (135/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Inline Functions—82583V GbE Controller
7.1.10.3
IPv4 Filter
This filter checks for valid IPv4 headers. The version field is checked for a correct value
(4).
IPv4 headers are accepted if they are any size greater than or equal to 5 (Dwords). If
the IPv4 header is properly decoded, the IP checksum is checked for validity. The
RXCSUM.IPOFL bit must be set for this filter to pass.
7.1.10.4
IPv6 Filter
This filter checks for valid IPv6 headers, which are a fixed size and have no checksum.
The IPv6 extension headers accepted are: hop-by-hop, destination options, and
routing. The maximum size next header accepted is 16 Dwords (64 bytes).
All of the IPv6 extension headers supported by the 82583V have the same header
structure:
Byte0
NEXT HEADER
Byte1
HDR EXT LEN
Byte2
Byte3
NEXT HEADER is a value that identifies the header type. The supported IPv6 next
headers values are:
• Hop-by-hop = 0x00
• Destination options = 0x3C
• Routing = 0x2B
HDR EXT LEN is the 8-byte count of the header length, not including the first 8 bytes.
For example, a value of three means that the total header size including the NEXT
HEADER and HDR EXT LEN fields is 32 bytes (8 + 3*8).
The RFCTL.Ipv6_DIS bit must be cleared for this filter to pass.
7.1.10.5
7.2
UDP/TCP Filter
This filter checks for a valid UDP or TCP header. The prototype next header values are
0x11 and 0x06, respectively. The RXCSUM.TUOFL bit must be set for this filter to pass.
Packet Transmission
7.2.1
Transmit Functionality
The 82583V transmit flow is a descriptor-based transmit where the hardware gets the
per-packet details for the transmit tasks through descriptors created by software.
This section outlines the transmit structures and process along with features and
offloads supported by the 82583V.
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