netdev - Re: [E1000-devel] [PATCH] net: enable GRO by default for vlan devices

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Date:	Thu, 16 Sep 2010 08:42:56 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...tta.com, bphilips@...e.de,
	e1000-devel@...ts.sourceforge.net, bruce.w.allan@...el.com,
	jesse.brandeburg@...el.com, john.ronciak@...el.com,
	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	bhutchings@...arflare.com
Subject: Re: [E1000-devel] [PATCH] net: enable GRO by default for vlan
 devices

Le mercredi 15 septembre 2010 à 23:38 -0700, David Miller a écrit :
> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Wed, 15 Sep 2010 23:21:25 -0700
> 
> > I think it is more complex than that. GRO is tied to NAPI,
> > and bridge/bond don't use NAPI directly. They use netif_rx() for receiving
> > because layered drivers can't directly up call because of possible
> > issues with stack depth. 
> > 
> > To get GRO working for netif_rx case,
> > the logic in process_backlog would have to change.
> > But this queue is processing packets from multiple devices so
> > it is not clear if GRO could be used.
> 
> Bonding's un-layering on RX is done in the normal netif_receive_skb()
> control flow.
> 
> And bridging only uses netif_rx for multicast replication.

Yes, bonding case should be easy, I'll take a look today.


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