82583V Datasheet, PDF (125/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Inline Functions—82583V GbE Controller
Note:
Descriptor Write-Back Format:
63
48 47
32 31
20
0
Reserved
Packet Checksum
IP Identification
8
VLAN Tag
Length 0
Extended Error
1
6
Length 3
Length 2
Length 1
2
4
Reserved
19
16
15
0
MRQ
Extended Status
Header Status
Light-blue fields are mutually exclusive by RXCSUM.PCSD
MRQ - Same as extended Rx descriptor.
Packet Checksum, IP Identification - Same as extended Rx descriptor.
Extended Status, Extended Errors, VLAN Tag - Same as extended Rx descriptor.
7.1.5.3
Note:
Length 0 (16-Bit, Offset 8.32), Length [3:1] (3- x 16-Bit, Offset 16.16)
Upon a packet reception, hardware stores the packet data in one or more of the
indicated buffers. Hardware writes in the Length field of each buffer the number of
bytes that were posted in the corresponding buffer. If no packet data is stored in a
given buffer, hardware writes 0b in the corresponding Length field. Length covers the
data written to receive buffer including CRC bytes (if any).
Software is responsible for checking the Length fields of all buffers for data that
hardware might have written to the corresponding buffers.
The larger buffer sizes are only offered to provide compatibility with other silicon types.
Jumbo frames are not supported with the 82583V.
7.1.5.4
Header Status (16-Bit, Offset 16.0):
15
14
10 9
0
HDRSP
Reserved
HLEN (Header Length)
HDRSP (bit 15) - Headers were split
Reserved (bits 14:10) - Reserved
Header Length (bits 9:0) - Packet header length
125