netdev - Re: [PATCH net] xen: netback: read hotplug script once at start of day.

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Message-ID: <20150601090704.GJ30474@zion.uk.xensource.com>
Date:	Mon, 1 Jun 2015 10:07:04 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Ian Campbell <ian.campbell@...rix.com>
CC:	Wei Liu <wei.liu2@...rix.com>, <xen-devel@...ts.xen.org>,
	<netdev@...r.kernel.org>, <david.vrabel@...rix.com>
Subject: Re: [PATCH net] xen: netback: read hotplug script once at start of
 day.

On Mon, Jun 01, 2015 at 09:52:45AM +0100, Ian Campbell wrote:
> On Fri, 2015-05-29 at 18:38 +0100, Wei Liu wrote:
> > On Fri, May 29, 2015 at 05:24:53PM +0100, Ian Campbell wrote:
> > [...]
> > >  	if (be->vif != NULL)
> > >  		return 0;
> > > @@ -417,12 +409,23 @@ static int backend_create_xenvif(struct backend_info *be)
> > >  		return (err < 0) ? err : -EINVAL;
> > >  	}
> > >  
> > > +	script = xenbus_read(XBT_NIL, dev->nodename, "script", NULL);
> > > +	if (IS_ERR(script)) {
> > > +		int err = PTR_ERR(script);
> > > +		xenbus_dev_fatal(dev, err, "reading script");
> > > +		return err;
> > > +	}
> > > +
> > >  	vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
> > >  	if (IS_ERR(vif)) {
> > >  		err = PTR_ERR(vif);
> > >  		xenbus_dev_fatal(dev, err, "creating interface");
> > > +		kfree(script);
> > >  		return err;
> > >  	}
> > > +
> > > +	vif->hotplug_script = script;
> > > +
> > 
> > IMO it's better we make xenvif_alloc accept a new parameter called
> > "script" then allocate vif->hotplug_script there. Then free
> > vif->hotplug_script in xenvif_free. This way it's less error prone
> > because all memory allocated for vif is managed in proper place -
> > xenvif_alloc and xenvif_free.
> 
> Well, except the allocation is still in xenbus_read via
> backend_create_xenvif, but yes I think that refactoring would be an
> improvement.
> 
> What about storing it in struct backend_info and setting/restoring in
> netback_{probe,remove}? That might be best of all?
> 

Yes, that would be best.

Wei.

> Ian.
> 
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