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RTL8111F-CG Datasheet(PDF) 24 Page - Realtek Semiconductor Corp. |
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RTL8111F-CG Datasheet(HTML) 24 Page - Realtek Semiconductor Corp. |
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24 / 37 page  RTL8111F Datasheet Integrated Gigabit Ethernet Controller for PCI Express 19 Track ID: JATR-2265-11 Rev. 1.1 6.7. Receive-Side Scaling (RSS) The RTL8111F 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. 6.7.1. Receive-Side Scaling (RSS) Initialization During RSS initialization, the Windows operating system will inform the RTL8111F 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 RTL8111F 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. |
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