netdev - Re: [PATCH net-next 11/15]bnx2x: Add TPA, Broadcoms HW LRO

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Date:	Thu, 19 Jun 2008 20:42:43 +0300
From:	"Eilon Greenstein" <eilong@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	bhutchings@...arflare.com, netdev@...r.kernel.org,
	mchan@...adcom.com, vladz@...adcom.com
Subject: Re: [PATCH net-next 11/15]bnx2x: Add TPA, Broadcoms HW LRO


On Tue, 2008-06-17 at 16:16 -0700, David Miller wrote:
> From: Ben Hutchings <bhutchings@...arflare.com>
> Date: Tue, 17 Jun 2008 16:17:06 +0100
> 
> > Ben Hutchings wrote:
> > > Eilon Greenstein wrote:
> > > > The TPA stands for Transparent Packet Aggregation. When enabled, the FW
> > > > aggregate in-order TCP packets according to the 4-tuple match and sends
> > > > 1 big packet to the driver. This packet is stored on an SGL in which
> > > > each SGE is 1 page. The FW also implements a timeout algorithm and it
> > > > honors all TCP flag, including the push flag as a trigger to halt
> > > > aggregation.
> > > [...]
> > > 
> > > LRO is not compatible with forwarding and will currently trigger a BUG() or
> > > WARN() if used on packets that are then forwarded.
> > 
> > Actually, since this implementation doesn't set gso_size in LRO'd skbs, it
> > will confuse TCP in interesting ways instead.  You need to set gso_size to
> > the largest segment size seen in the packets that were aggregated.
> 
> Eilon, please sort this out, thanks.
Just to make sure that we are working in the right direction: we will
add the ethtool support and the gso_size, but until Ben's patch will be
in place, we will still fail in the same way any other LRO driver will
fail in forwarding.
If this is the case, I will send another patch with the ethtool and
gso_size soon.

Please confirm,
Eilon




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