linux-kernel - Re: [PATCH 0/2] fix kernel crash with macvtap on top of LRO

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Date:	Wed, 6 Feb 2013 23:34:20 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	<netdev@...r.kernel.org>, Eilon Greenstein <eilong@...adcom.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Alex Duyck <alexander.h.duyck@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Tushar Dave <tushar.n.dave@...el.com>,
	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	<linux-driver@...gic.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jacob Keller <jacob.e.keller@...el.com>,
	<linux-kernel@...r.kernel.org>,
	<e1000-devel@...ts.sourceforge.net>, <eric.dumazet@...il.com>
Subject: Re: [PATCH 0/2] fix kernel crash with macvtap on top of LRO

On Thu, 2013-02-07 at 01:02 +0200, Michael S. Tsirkin wrote:
> At the moment, macvtap crashes are observed if macvtap is attached
> to an interface with LRO enabled.
> The crash in question is BUG() in macvtap_skb_to_vnet_hdr.
> This happens because several drivers set gso_size but not gso_type
> in incoming skbs.
> The following patches fix this for
> Additionally, cbf1de72324a8105ddcc3d9ce9acbc613faea17e is required
> to fix this for broadcom - would it make sense to cherry-pick
> this patch into 3.8?
> 
> I tested that the patch fixes the crash for ixgbe but
> don't have qlogic hardware to fix.  I also only tested TCP.
> 
> Feedback wellcome.

If we want to allow forwarding from LRO then net/ipv4/inet_lro.c also
needs to set gso_type.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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