From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zoltan Kiss Subject: Re: [Xen-devel] [RFC v2 4/4] xen-netback: skip IPv4 and IPv6 interfaces Date: Mon, 17 Feb 2014 14:36:55 +0000 Message-ID: <53021E87.6020607@citrix.com> References: <1392433180-16052-1-git-send-email-mcgrof@do-not-panic.com> <1392433180-16052-5-git-send-email-mcgrof@do-not-panic.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit Cc: Wei Liu , Ian Campbell , , "Luis R. Rodriguez" , , Paul Durrant , To: "Luis R. Rodriguez" , Return-path: Received: from smtp02.citrix.com ([66.165.176.63]:59183 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750830AbaBQOhV (ORCPT ); Mon, 17 Feb 2014 09:37:21 -0500 In-Reply-To: <1392433180-16052-5-git-send-email-mcgrof@do-not-panic.com> Sender: netdev-owner@vger.kernel.org List-ID: There is a valid scenario to put IP addresses on the backend VIFs: http://wiki.xen.org/wiki/Xen_Networking#Routing Also, the backend is not necessarily Dom0, you can connect twou guests with backend/frontend pairs. Zoli On 15/02/14 02:59, Luis R. Rodriguez wrote: > From: "Luis R. Rodriguez" > > The xen-netback driver is used only to provide a backend > interface for the frontend. The link is the only thing we > use, and that is used internally for letting us know when the > xen-netfront is ready, when it switches to XenbusStateConnected. > > Note that only when the both the xen-netfront and xen-netback > are both in state XenbusStateConnected will xen-netback allow > userspace on the host (backend) to bring up the interface. Enabling > and disabling the interface will simply enable or disable NAPI > respectively, and that's used for IRQ communication set up with > the xen event channels. > > Cc: Paul Durrant > Cc: Ian Campbell > Cc: Wei Liu > Cc: xen-devel@lists.xenproject.org > Cc: netdev@vger.kernel.org > Signed-off-by: Luis R. Rodriguez > --- > drivers/net/xen-netback/interface.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c > index d380e3f..07e6fd2 100644 > --- a/drivers/net/xen-netback/interface.c > +++ b/drivers/net/xen-netback/interface.c > @@ -351,7 +351,7 @@ struct xenvif *xenvif_alloc(struct device *parent, domid_t domid, > > eth_hw_addr_random(dev); > memcpy(dev->dev_addr, xen_oui, 3); > - dev->priv_flags |= IFF_BRIDGE_NON_ROOT; > + dev->priv_flags |= IFF_BRIDGE_NON_ROOT | IFF_SKIP_IP; > netif_napi_add(dev, &vif->napi, xenvif_poll, XENVIF_NAPI_WEIGHT); > > netif_carrier_off(dev); >