On Mon, Nov 11, 2013 at 04:53:17PM +0100, Thomas Graf wrote:
> On 11/11/2013 04:50 PM, Ben Pfaff wrote:
> >On Mon, Nov 11, 2013 at 04:36:24PM +0100, Thomas Graf wrote:
> >>Following commit (''netlink: Do not enforce alignment of last Netlink
> >>attribute''), signal the ability to receive unaligned Netlink messages
> >>to the datapath to enable utilization of zerocopy optimizations.
> >>
> >>Signed-off-by: Thomas Graf <tg...@redhat.com>
> >
> >Seems OK from a userspace point of view. I am a little concerned that
> >downgrading userspace without deleting and re-creating the datapath
> >(e.g. via "force-reload-kmod") will result in a totally broken setup
> >since userspace will then drop every packet from the kernel.
>
> Is that something that occurs occasionally in installations?
Occasionally. If an upgrade appears to break something then downgrading
is an obvious option. If then downgrading breaks the system completely
it's a bad situation. We can always tell users to "force-reload-kmod"
on a downgrade but it's better when stuff just works.
> Utilizing the version field in the genl header could be used to track
> this and clear user_features.
Jesse?
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