netdev - Re: [Patch V2] bonding: fix netpoll in active-backup mode

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Date:	Wed, 09 Mar 2011 20:32:31 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Neil Horman <nhorman@...driver.com>
CC:	linux-kernel@...r.kernel.org, Jay Vosburgh <fubar@...ibm.com>,
	netdev@...r.kernel.org
Subject: Re: [Patch V2] bonding: fix netpoll in active-backup mode

于 2011年03月08日 21:43, Neil Horman 写道:
> On Tue, Mar 08, 2011 at 05:58:56PM +0800, Amerigo Wang wrote:
>> V2: avoid calling slave_diable_netpoll() with write_lock_bh() held.
>>
>> netconsole doesn't work in active-backup mode, because we don't do anything
>> for nic failover in active-backup mode. We should disable netpoll on the
>> failing slave when it is detected down and enable netpoll when it becomes
>> the active slave.
>>
> You still haven't explained why it needs to be this way.  what exactly is the
> shortcomming with leaving netpoll enabled on all slaves, regardless of state?
> It should be sufficient if, during a failover in a mode where the inactive slave
> should not tx data, that you simply clear the slave __LINK_STATE_START bit.  That will
> prevent higher layers from sending any queued data without you needing to muck
> about with netpoll state.
>

Oh, actually I thought the struct net_device of the failing interface will be freed,
but that is not true...

So, yeah, I think just setup netpoll in bond_netpoll_setup() should be sufficient.

Thanks.
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