linux-kernel - Re: [PATCH 1/4] Add ETHTOOL

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Date:	Fri, 10 Aug 2007 15:10:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	jeff@...zik.org, auke-jan.h.kok@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Add ETHTOOL_[GS]FLAGS sub-ioctls

From: Ben Greear <greearb@...delatech.com>
Date: Fri, 10 Aug 2007 14:11:24 -0700

> Jeff Garzik wrote:
> 
> > This patch copies Auke in adding NETIF_F_LRO.  Is that just for 
> > temporary merging, or does the net core really not touch it at all?
> > 
> > Because, logically, if NETIF_F_LRO exists nowhere else but this patch, 
> > we should not add it to dev->features.  LRO knowledge can be contained 
> > entirely within the driver, if the net core never tests NETIF_F_LRO.
> > 
> > I haven't reviewed the other NETIF_F_XXX flags, but, that logic can be 
> > applied to any other NETIF_F_XXX flag:  if the net stack isn't using it, 
> > it's a piece of information specific to that driver.
> 
> I believe LRO is going to have to be disabled for routing/bridging,
> so the stack will probably need to become aware of it at some point...

The packet will be GSO'd on output I believe, so it won't
break anything.

Alternatively, we could make the driver only LRO accumulate if the
packet is unicast and matches one of the MAC's programmed into the
chip.
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