netdev - RE: [Xen-devel] [PATCH] xen-netback: prefer xenbus_write() over xenbus

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Date:	Thu, 7 Jul 2016 08:27:22 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>, Wei Liu <wei.liu2@...rix.com>
CC:	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [Xen-devel] [PATCH] xen-netback: prefer xenbus_write() over
 xenbus_printf() where possible

> -----Original Message-----
> From: Xen-devel [mailto:xen-devel-bounces@...ts.xen.org] On Behalf Of Jan
> Beulich
> Sent: 07 July 2016 08:58
> To: Wei Liu
> Cc: xen-devel@...ts.xenproject.org; netdev@...r.kernel.org
> Subject: [Xen-devel] [PATCH] xen-netback: prefer xenbus_write() over
> xenbus_printf() where possible
> 
> ... as being the simpler variant.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>

Reviewed-by: Paul Durrant <paul.durrant@...rix.com>

> ---
>  drivers/net/xen-netback/xenbus.c |   24 +++++++++---------------
>  1 file changed, 9 insertions(+), 15 deletions(-)
> 
> --- 4.7-rc6-prefer-xenbus_write.orig/drivers/net/xen-netback/xenbus.c
> +++ 4.7-rc6-prefer-xenbus_write/drivers/net/xen-netback/xenbus.c
> @@ -301,17 +301,15 @@ static int netback_probe(struct xenbus_d
>  		}
> 
>  		/* We support partial checksum setup for IPv6 packets */
> -		err = xenbus_printf(xbt, dev->nodename,
> -				    "feature-ipv6-csum-offload",
> -				    "%d", 1);
> +		err = xenbus_write(xbt, dev->nodename,
> +				   "feature-ipv6-csum-offload", "1");
>  		if (err) {
>  			message = "writing feature-ipv6-csum-offload";
>  			goto abort_transaction;
>  		}
> 
>  		/* We support rx-copy path. */
> -		err = xenbus_printf(xbt, dev->nodename,
> -				    "feature-rx-copy", "%d", 1);
> +		err = xenbus_write(xbt, dev->nodename, "feature-rx-copy",
> "1");
>  		if (err) {
>  			message = "writing feature-rx-copy";
>  			goto abort_transaction;
> @@ -321,24 +319,22 @@ static int netback_probe(struct xenbus_d
>  		 * We don't support rx-flip path (except old guests who don't
>  		 * grok this feature flag).
>  		 */
> -		err = xenbus_printf(xbt, dev->nodename,
> -				    "feature-rx-flip", "%d", 0);
> +		err = xenbus_write(xbt, dev->nodename, "feature-rx-flip",
> "0");
>  		if (err) {
>  			message = "writing feature-rx-flip";
>  			goto abort_transaction;
>  		}
> 
>  		/* We support dynamic multicast-control. */
> -		err = xenbus_printf(xbt, dev->nodename,
> -				    "feature-multicast-control", "%d", 1);
> +		err = xenbus_write(xbt, dev->nodename,
> +				   "feature-multicast-control", "1");
>  		if (err) {
>  			message = "writing feature-multicast-control";
>  			goto abort_transaction;
>  		}
> 
> -		err = xenbus_printf(xbt, dev->nodename,
> -				    "feature-dynamic-multicast-control",
> -				    "%d", 1);
> +		err = xenbus_write(xbt, dev->nodename,
> +				   "feature-dynamic-multicast-control", "1");
>  		if (err) {
>  			message = "writing feature-dynamic-multicast-
> control";
>  			goto abort_transaction;
> @@ -368,9 +364,7 @@ static int netback_probe(struct xenbus_d
>  	if (err)
>  		pr_debug("Error writing multi-queue-max-queues\n");
> 
> -	err = xenbus_printf(XBT_NIL, dev->nodename,
> -			    "feature-ctrl-ring",
> -			    "%u", true);
> +	err = xenbus_write(XBT_NIL, dev->nodename, "feature-ctrl-ring",
> "1");
>  	if (err)
>  		pr_debug("Error writing feature-ctrl-ring\n");
> 
> 
> 
> 
> 
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