netdev - Re: [PATCH] Add support for netconsole driver used on bridge device with VIF attached

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Message-ID: <1358789308.3279.271.camel@zakaz.uk.xensource.com>
Date:	Mon, 21 Jan 2013 17:28:28 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Yuval Shaia <yuval.shaia@...cle.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] Add support for netconsole driver used on bridge device
 with VIF attached

On Mon, 2013-01-21 at 17:17 +0000, Yuval Shaia wrote:

> When starting a VM which has virtual interface attached to the same 
> bridge (i.e vif = [type=netfront,bridge=xenbr0'] in vm.cfg) which is 
> used for netconsole the
> following message appears (after about 60 seconds) and VM creation 
> operation fails.
>       Error: Device 0 (vif) could not be connected. Hotplug scripts not 
> working.

I'm not sure how this can relate netconsole since this happens before
the guest even runs, doesn't it?

> As i see it, netconsole driver requires ndo_poll_controller from the
> device's controlling driver (function __netpoll_setup in
> net/core/netpoll.c), a thing that is not supported currently in
> xen_netback driver which is the driver that runs on dom0 and serve
> VM's virtual interface.

Which domain is using netconsole? Is it dom0 or domU? What parameters do
you give it?

I assume it is the domU but if that's the case I don't see why a netback
rather than netfront patch would be required.

Or is dom0 doing netconsole where the log receiver is a domU?

Ian.

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