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

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Date:	Thu, 07 Feb 2013 11:25:13 +0800
From:	Cong Wang <xiyou.wangcong@...il.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,
	bhutchings@...arflare.com, eric.dumazet@...il.com
Subject: Re: [PATCH 0/2] fix kernel crash with macvtap on top of LRO

On 02/07/2013 07:02 AM, 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?


Doesn't macvtap need to call skb_warn_if_lro() too like bridge and 
openvswitch? Something like...

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index b181dfb..b2c6227 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -253,6 +253,9 @@ static int macvtap_forward(struct net_device *dev, 
struct sk_buff *skb)
         if (!q)
                 goto drop;

+       if (unlikely(skb_warn_if_lro(skb)))
+               goto drop;
+
         if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len)
                 goto drop;


I am not saying these drivers don't need to fix, I am just saying if we 
need to fix LRO case.

Thanks.
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