netdev - Re: [PATCH 1/2] net: Toeplitz library functions

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Message-ID: <CA+mtBx_tWS44q8jER+QtR5k4k2ieq99He6YdPF8KKBF4Z2+32w@mail.gmail.com>
Date:	Tue, 24 Sep 2013 10:03:25 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Subject: Re: [PATCH 1/2] net: Toeplitz library functions

On Tue, Sep 24, 2013 at 9:46 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Tue, 2013-09-24 at 09:35 -0700, Tom Herbert wrote:
>
>> We should really be using rxhash for that anyway, eliminate this
>> ehashfn.  This would entail adding rxhash argument in the various
>> udp_lookup functions.
>
> Nope : Some NICs provide UDP rxhash only using L3  (source IP,
> destination IP), not L4 (adding source & destination ports)
>
Then the NIC won't set l4_rxhash and we'll rehash over 4-tuple when
skb_get_rxhash is called.

> This is again a case where we want our own hashing.
>
>
>
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