WG82574L S LBA8 Intel, WG82574L S LBA8 Datasheet - Page 144

• Manufacturer Part Number: WG82574L S LBA8
• Manufacturer: Intel

Specifications of WG82574L S LBA8

• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: 0C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / RoHS Status: Compliant

7.1.11.1.1
7.1.11.1.2
7.1.11.1.3
7.1.11.1.4
7.1.11.2
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The following four pseudo-code examples are intended to help clarify exactly how the
hash is to be performed in four cases, IPv4 with and without ability to parse the TCP
header, and IPv6 with an without a TCP header.
Hash for IPv4 with TCP
Concatenate SourceAddress, DestinationAddress, SourcePort, DestinationPort into
one single byte-array, preserving the order in which they occurred in the packet:
Input[12] = @12-15, @16-19, @20-21, @22-23.
Result = ComputeHash(Input, 12);
Hash for IPv4 without TCP
Concatenate SourceAddress and DestinationAddress into one single byte-array
Input[8] = @12-15, @16-19
Result = ComputeHash(Input, 8)
Hash for IPv6 with TCP
Similar to above:
Input[36] = @8-23, @24-39, @40-41, @42-43
Result = ComputeHash(Input, 36)
Hash for IPv6 without TCP
Input[32] = @8-23, @24-39
Result = ComputeHash(Input, 32)
Redirection Table
The redirection table is a 128-entry structure, indexed by the seven LSBs of the hash
function output. Each entry of the table contains the following:
The queue index determined the physical queue for the packet.
The contents of the redirection table are not defined following reset of the Memory
Configuration registers. System software must initialize the table prior to enabling
multiple receive queues. It might also update the redirection table during run time.
Such updates of the table are not synchronized with the arrival time of received
packets. Therefore, it is not guaranteed that a table update takes effect on a specific
packet boundary.
• Bit [7] - Queue index
• Bits [6:0] - Reserved
82574 GbE Controller—Inline Functions