linux-kernel - Re: [PATCH 1/2] ixgbe: fix gso type

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Date:	Wed, 06 Feb 2013 19:21:32 -0800
From:	Eric Dumazet <eric.dumazet@...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
Subject: Re: [PATCH 1/2] ixgbe: fix gso type

On Thu, 2013-02-07 at 01:02 +0200, Michael S. Tsirkin wrote:
> ixgbe set gso_size but not gso_type. This leads to
> crashes in macvtap.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 
> I tested that this fixes the crash for me.  I am told on ixgbe LRO only
> triggers with TCP so checking protocol should be enough?
> 
>  drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index 396e280..9d01673 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -1399,6 +1399,10 @@ static void ixgbe_set_rsc_gso_size(struct ixgbe_ring *ring,
>  	/* set gso_size to avoid messing up TCP MSS */
>  	skb_shinfo(skb)->gso_size = DIV_ROUND_UP((skb->len - hdr_len),
>  						 IXGBE_CB(skb)->append_cnt);
> +	if (skb->protocol == ETH_P_IPV6)

Same problem here (skb->protocol == htons(ETH_P_IPV6))

> +		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
> +	else
> +		skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
>  }
>  

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