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Is it possible to fetch RSS hash value in the e1000e driver when using 82574 adapter?

idata
Employee
‎04-29-2012 09:55 PM
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Hi,I want to fetch RSS value to use it for RPS functionality,The 82574L provides two hardware receive queues and suppor RSS,how to enable this feature?
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Mark_H_Intel
Employee
‎04-30-2012 04:18 PM
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I checked with our developers for an answer. This is what I learned:

The RSS hash is available for software RPS in our out-of-tree driver as of version 1.9.5 and is in the in-kernel driver for the 3.4 kernel. However, the driver does not enable the second receive queue (MQ).

Mark H

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idata
Employee
‎05-03-2012 06:06 AM
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In response to Mark_H_Intel

Hi,Mark H

RSS hash value is non-commutative when using 82574L,both directions of the tcp connection produce different hash values,i.e. SourceAddress, DestinationAddress, SourcePort, DestinationPort and DestinationAddress,SourceAddress,DestinationPort,SourcePort gives different result,skb->rxhash using by RPS,packet will be processed by different core,how to solve the problem?

In response to Mark_H_Intel
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