82583V Datasheet, PDF (122/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

82583V GbE Controller—Inline Functions
Note:
Packet Type
0xC
0xD
0xE
Description
MAC (VLAN/SNAP), IPv6,TCP/UDP, NFS, payload
Reserved
Reserved
— Payload does not mean raw data but can also be unsupported header.
— If there is an NFS/iSCSI header in the packets it can be seen in the packet type
field.
If the device is not configured to provide any offload that requires packet parsing, the
packet type field is set to 0b regardless of the actual packet type.
7.1.4.7
Extended Errors (12-Bit, Offset 8.20)
7.1.4.7.1
11
10
9
8
7
6
5
4
RXE
IPE
TCPE
CXE
Rsvd
SEQ
SE
CE
3
2
1
0
Rsvd
Rsvd
RXE (bit 11) - Rx data error - Same as legacy descriptor.
IPE (bit 10) - IPv4 checksum error - Same as legacy descriptor.
TCPE (bit 9) - TCP/UDP checksum error - Same as legacy descriptor.
CXE (bit 8) - Carrier extension error - Same as legacy descriptor.
SEQ (bit 6) - Sequence error - Same as legacy descriptor.
SE (bit 5) - Symbol error - Same as legacy descriptor.
CE (bit 4) - CRC error or alignment error - Same as legacy descriptor.
Reserved (bits 7, 3:0) - Reserved
RXE IPE TCPE CXE SEQ SE CE: Same as legacy descriptor.
Length (16-bit, offset 8.32): Same as the length field at offset 8.0 in the legacy
descriptor.
VLAN Tag (16-bit, offset 8.48): Same as legacy descriptor.
Receive UDP Fragmentation Checksum
The 82583V might provide receive fragmented UDP checksum offload. The following
setup should be made to enable this mode:
RXCSUM.PCSD bit should be cleared. When the PCSD bit is cleared, Packet Checksum
and IP Identification are active.
RXCSUM.IPPCSE bit should be set. This field enables the IP payload checksum enable
that is designed for the fragmented UDP checksum.
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