netdev - Re: [PATCH] bnx2x: add support for receive hashing

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Date:	Mon, 26 Apr 2010 10:38:27 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] bnx2x: add support for receive hashing

> Hi Tom
>
> I tested this rxhash feature on my bnx2x card, using latest net-next-2.6
> and appropriate ethtool
>
> ethtool -k eth1 rxhash on
>
> Then I used my pktgen script, to flood machine with flows with udp dst
> port varying between 4000 and 4015.
>
> Software generated rxhash is OK (16 different values).
>
> But with bnx2x provided hash, all skb were hashed to same rxhash
> value :(
>
> What are the specs of this hardware hash ?
> It seems to not care of udp source/destination ports.
>

It would appear that way :-(.  I was going to ping Broadcom folks to
see if there's support for UDP.

> Also, should'nt we feed same values for the seeds on different nics ?
>
> for (i = SRC_REG_KEYRSS0_0; i <= SRC_REG_KEYRSS1_9; i += 4)
>        REG_WR(bp, i, random32());
>

Yes, that is reasonable.

> Thanks
>
>
>
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