RTL8111E Просмотр технического описания (PDF) - Realtek Semiconductor

Номер в каталоге

Компоненты Описание

производитель

RTL8111E

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS APPLICATIONS

Realtek Semiconductor 

RTL8111E

Datasheet

6.8. Receive-Side Scaling (RSS)

The RTL8111E complies with the Network Driver Interface Specification (NDIS) 6.0 Receive-Side

Scaling (RSS) technology for the Microsoft Windows family of operating systems. RSS allows packet

receive-processing from a network adapter to be balanced across the number of available computer

processors, increasing performance on multi-CPU platforms.

6.8.1. Receive-Side Scaling (RSS) Initialization

During RSS initialization, the Windows operating system will inform the RTL8111E that it should store

the following parameters: hash function, hash type, hash bits, indirection table, BaseCPUNumber, and the

secret hash key.

Hash Function

The default hash function is the Toeplitz hash function.

Hash Type

The hash types indicate which field of the packet needs to be hashed to get the hash result. There are

several combinations of these fields, mainly, TCP/IPv4, IPv4, TCP/IPv6, IPv6, and IPv6 extension

headers.

• TCP/IPv4 requires hash calculations over the IPv4 source address, the IPv4 destination address, the

source TCP port and the destination TCP port.

• IPv4 requires hash calculations over the IPv4 source address and the IPv4 destination address.

• TCP/IPv6 requires hash calculations over the IPv6 source address, the IPv6 destination address, the

source TCP port and the destination TCP port.

• IPv6 requires hash calculations over the IPv6 source address and the IPv6 destination address

(Note: The RTL8111E does not support the IPv6 extension header hash type in RSS).

Hash Bits

Hash bits are used to index the hash result into the indirection table

Indirection Table

The Indirection Table stores values that are added to the BaseCPUNumber to enable RSS interrupts to be

restricted from some CPUs. The OS will update the Indirection Table to rebalance the load.

BaseCPUNumber

The lowest number CPU to use for RSS. BaseCPUNumber is added to the result of the indirection table

lookup.

Secret hash key

The key used in the Toeplitz function. For different hash types, the key size is different.

Integrated Gigabit Ethernet Controller for PCI Express

18

Track ID: JATR-2265-11 Rev. 1.5

Share Link: