netdev - Re: [PATCH 6/7] mlx4_en: Adding rxhash support

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Date:	Tue, 18 Oct 2011 03:48:45 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yevgeny Petrilin <yevgenyp@...lanox.co.il>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH 6/7] mlx4_en: Adding rxhash support

Le lundi 17 octobre 2011 à 22:18 +0200, Yevgeny Petrilin a écrit :
> Moving to Toeplitz function in RSS calculation.
> Reporting rxhash in skb.
> 
> Signed-off-by: Yevgeny Petrilin <yevgenyp@...lanox.co.il>

>  	rss_context->flags = rss_mask;
> +	rss_context->hash_fn = 1;
> +	for (i = 0; i < 10; i++)
> +		rss_context->rss_key[i] = random32();
>  

Thats bit of a problem : Two NICS will have different seeds, and thus
provide different rxhash for a given flow. A bonding of two NICS will
not be able to provide a consistent rxhash.

drivers/net/ethernet/intel/igb/igb_main.c uses a static table to avoid
this problem.


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