Re: i40e and RSS woes

[Gleb Natapov <gleb-RmZWMc9puTNJc61us3aD9laTQe2KTcn/@public.gmane.org>]

CCing i40e driver author in a hope to get an answer.

On Mon, Feb 16, 2015 at 03:36:54PM +0200, Gleb Natapov wrote:
> I have an application that works reasonably well with ixgbe driver, but
> when I try to use it with i40e I encounter various RSS related issues.
> 
> First one is that for some reason i40e, when it builds default reta
> table, round down number of queues to power of two. Why is this? If I
> configure reta by my own using all of the queues everything seams to be
> working. To add insult to injury I do not get any errors during
> configuration some queues just do not receive any traffic.
> 
> The second problem is that for some reason i40e does not use 40 byte
> toeplitz hash key like any other driver, but it expects the key to be 52
> bytes. And it would have being fine (if we ignore the fact that it
> contradicts MS spec), but how my high level code suppose to know that?
> And again, device configuration does not fail when wrong key length is
> provided, it just uses some other key. Guys this kind of error handling
> is completely unacceptable.
> 
> The last one is more of a question. Why interface to change RSS hash
> function (XOR or toeplitz) is part of a filter configuration and not rss
> config?
> 
> --
> 			Gleb.

--
			Gleb.