netdev - RE: [PATCH net-next] xen-netback: stop vif thread spinning if frontend is unresponsive

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Date:	Wed, 8 Jan 2014 09:49:53 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: RE: [PATCH net-next] xen-netback: stop vif thread spinning if
 frontend is unresponsive

> -----Original Message-----
> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of David Miller
> Sent: 07 January 2014 21:30
> To: Paul Durrant
> Cc: netdev@...r.kernel.org; xen-devel@...ts.xen.org; Wei Liu; Ian Campbell;
> David Vrabel
> Subject: Re: [PATCH net-next] xen-netback: stop vif thread spinning if
> frontend is unresponsive
> 
> From: Paul Durrant <paul.durrant@...rix.com>
> Date: Tue, 7 Jan 2014 16:25:29 +0000
> 
> > @@ -477,6 +477,7 @@ static void xenvif_rx_action(struct xenvif *vif)
> >  	unsigned long offset;
> >  	struct skb_cb_overlay *sco;
> >  	int need_to_notify = 0;
> > +	int ring_full = 0;
> 
> Please use bool, false, and true.
> 
> >
> > -	if (!npo.copy_prod)
> > +	if (!npo.copy_prod) {
> > +		if (ring_full)
> > +			vif->rx_queue_stopped = true;
> >  		goto done;
> > +	}
> > +
> > +	vif->rx_queue_stopped = false;
> 
> And then you can code this as:
> 
> 	vif->rx_queue_stopped = (!npo.copy_prod && ring_full);
> 	if (!npo.copy_prod)
> 		goto done;

Sure. I was just following style (of need_to_notify). If you prefer bool then I'll use that and also convert need_to_notify.

  Paul

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