netdev - Re: [PATCH v2 net-next] xen-netback: add support for multicast control

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Message-ID: <20150902171155.GA30541@zion.uk.xensource.com>
Date:	Wed, 2 Sep 2015 18:11:56 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Paul Durrant <paul.durrant@...rix.com>
CC:	<netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>
Subject: Re: [PATCH v2 net-next] xen-netback: add support for multicast
 control

On Wed, Sep 02, 2015 at 05:58:36PM +0100, Paul Durrant wrote:
> Xen's PV network protocol includes messages to add/remove ethernet
> multicast addresses to/from a filter list in the backend. This allows
> the frontend to request the backend only forward multicast packets
> which are of interest thus preventing unnecessary noise on the shared
> ring.
> 
> The canonical netif header in git://xenbits.xen.org/xen.git specifies
> the message format (two more XEN_NETIF_EXTRA_TYPEs) so the minimal
> necessary changes have been pulled into include/xen/interface/io/netif.h.
> 
> To prevent the frontend from extending the multicast filter list
> arbitrarily a limit (XEN_NETBK_MCAST_MAX) has been set to 64 entries.
> This limit is not specified by the protocol and so may change in future.
> If the limit is reached then the next XEN_NETIF_EXTRA_TYPE_MCAST_ADD
> sent by the frontend will be failed with NETIF_RSP_ERROR.
> 
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
> Cc: Ian Campbell <ian.campbell@...rix.com>
> Cc: Wei Liu <wei.liu2@...rix.com>

Acked-by: Wei Liu <wei.liu2@...rix.com>
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