82598EB Datasheet, PDF (223/596 Pages) Intel Corporation – Intel® 82598EB 10 Gigabit Ethernet Controller Datasheet

Intel^® 82598EB 10 GbE Controller - Receive Functionality
Table 3-54. Descriptor Write-Back Format
63 59 55 51 47 43 39 35
60 56 52 48 44 40 36 32
0
RSS Hash value
Fragment Checksum
IP Identification
8
VLAN Tag
PKT_buf_Length
63
48 47
32
31
SPH
30:21
20
16
HDR_buf_le
n
RSV
15:4
Packet Type
3:0
RSS
Type
Extended Error
31
20
Extended Status
19
0
Light blue fields are mutually exclusive by RXCSUM.PCSD.
Packet Type (12)
• RSV(11-8) – Reserved
• NFS (bit 7) – NFS header present
• SCTP (bit 6) – SCTP header present
• UDP (bit 5) – UDP header present
• TCP (bit 4) – TCP header present
• IPV6E (bit 3) – IPv6 header includes extensions
• IPv6 (bit 2) – IPv6 header present
• IPv4E (bit1) – IPv4 header includes extensions
• IPv4 (bit 0) – IPv4 header present
Note: UDP, TCP and IPv6 indication are not set in an IPv4 fragmented packet.
RSS Type (8)
Packet Type
0x0
0x1
0x2
0x3
0x4
0x5
0x6
No hash computation done for this packet
HASH_TCP_IPv4
HASH_IPv4
HASH_TCP_IPv6
HASH_IPv6_EX
HASH_IPv6
HASH_TCP_IPv6_EX
Description
223