linux-kernel - Re: [PATCH net-next v2 2/2] xen-netback: Grant copy the header instead of map and memcpy

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Message-ID: <1396423778.26869.61.camel@dagon.hellion.org.uk>
Date:	Wed, 2 Apr 2014 08:29:38 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	Paul Durrant <Paul.Durrant@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Jonathan Davies" <Jonathan.Davies@...rix.com>
Subject: Re: [PATCH net-next v2 2/2] xen-netback: Grant copy the header
 instead of map and memcpy

On Tue, 2014-04-01 at 19:55 +0100, Zoltan Kiss wrote:
> >> @@ -1389,7 +1393,7 @@ static int xenvif_tx_submit(struct xenvif
> *vif)
> >>              txp = &vif->pending_tx_info[pending_idx].req;
> >>
> >>              /* Check the remap error code. */
> >> -            if (unlikely(xenvif_tx_check_gop(vif, skb, &gop_map)))
> {
> >> +            if (unlikely(xenvif_tx_check_gop(vif, skb, &gop_map,
> >> &gop_copy))) {
> >>                      netdev_dbg(vif->dev, "netback grant
> failed.\n");
> >
> > It could have been the copy that failed. You should probably change
> the error message.
> I've changed it to "netback grant op failed.\n"

Perhaps xenvif_tx_check_gop is in a position to log something more
specific about the failure? (maybe it already does, I didn't look).

Ian.


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