netdev - Re: [PATCH 3/3] net: deliver skbs on inactive slaves to exact matches

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Message-ID: <4BFDFAAA.8070701@intel.com>
Date:	Wed, 26 May 2010 21:52:58 -0700
From:	John Fastabend <john.r.fastabend@...el.com>
To:	"andy@...yhouse.net" <andy@...yhouse.net>,
	"fubar@...ibm.com" <fubar@...ibm.com>,
	"nhorman@...driver.com" <nhorman@...driver.com>,
	"bonding-devel@...ts.sourceforge.net" 
	<bonding-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/3] net: deliver skbs on inactive slaves to exact matches

Fastabend, John R wrote:
> Currently, the accelerated receive path for VLAN's will
> drop packets if the real device is an inactive slave and
> is not one of the special pkts tested for in
> skb_bond_should_drop().  This behavior is different then
> the non-accelerated path and for pkts over a bonded vlan.
> 
> For example,
> 
> vlanx -> bond0 -> ethx
> 
> will be dropped in the vlan path and not delivered to any
> packet handlers at all.  However,
> 
> bond0 -> vlanx -> ethx
> 
> and
> 
> bond0 -> ethx
> 
> will be delivered to handlers that match the exact dev,
> because the VLAN path checks the real_dev which is not a
> slave and netif_recv_skb() doesn't drop frames but only
> delivers them to exact matches.
> 
> This patch adds a sk_buff flag which is used for tagging
> skbs that would previously been dropped and allows the
> skb to continue to skb_netif_recv().  Here we add
> logic to check for the bond_should_drop flag and if it
> is set only deliver to handlers that match exactly.  This
> makes both paths above consistent and gives pkt handlers
> a way to identify skbs that come from inactive slaves.
> Without this patch in some configurations skbs will be
> delivered to handlers with exact matches and in others
> be dropped out right in the vlan path.
> 
> I have tested the following 4 configurations in failover modes
> and load balancing modes.
> 
> # bond0 -> ethx
> 
> # vlanx -> bond0 -> ethx
> 
> # bond0 -> vlanx -> ethx
> 
> # bond0 -> ethx
>             |
>   vlanx -> --
> 
> Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
> ---
> 

Jay,

I know you were looking over this series at one point.  Did you have any 
comments?  Sorry for the ping just wanted to keep this on my radar.

Thanks,
John
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