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Message-Id: <201010291545.17910.arnd@arndb.de> Date: Fri, 29 Oct 2010 15:45:17 +0200 From: Arnd Bergmann <arnd@...db.de> To: Sridhar Samudrala <sri@...ibm.com> Cc: Patrick McHardy <kaber@...sh.net>, Stephen Hemminger <shemminger@...tta.com>, "Michael S. Tsirkin" <mst@...hat.com>, netdev <netdev@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org> Subject: Re: [PATCH] macvlan: Introduce 'passthru' mode to takeover the underlying device On Friday 29 October 2010, Sridhar Samudrala wrote: > With the current default 'vepa' mode, a KVM guest using virtio with > macvtap backend has the following limitations. > - cannot change/add a mac address on the guest virtio-net I believe this could be changed if there is a neeed, but I actually consider it one of the design points of macvlan that the guest is not able to change the mac address. With 802.1Qbg you rely on the switch being able to identify the guest by its MAC address, which the host kernel must ensure. > - cannot create a vlan device on the guest virtio-net Why not? If this doesn't work, it's probably a bug! Why does the passthru mode enable it if it doesn't work already? > - cannot enable promiscuous mode on guest virtio-net Could you elaborate why such a setup would be useful? Arnd -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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