netdev - Re: [PATCH net] mlx4: TCP/UDP packets have L4 hash

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Message-ID: <1436132001.26467.1.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 05 Jul 2015 23:33:21 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ido Shamay <idos@....mellanox.co.il>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, Amir Vadai <amirv@...lanox.com>,
	Ido Shamay <idos@...lanox.com>
Subject: Re: [PATCH net] mlx4: TCP/UDP packets have L4 hash

On Mon, 2015-07-06 at 00:16 +0300, Ido Shamay wrote:

> We can have a relaxation of the condition  by looking only at TCP/UDP 
> CQE indication (without check-sum indications)
> This can cover us also when device rx-checksuming feature is off.
> Do we want it or a correlation between check-sum and l4_hash is needed?

I thought about that, but this was adding a more complex test in fast
path.

Not sure we should care here, as nobody would disable hardware checksum
if they care about performance.


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