netdev - Re: [net PATCH] net: virtio: cap mtu when XDP programs are running

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Message-ID: <20170110164654-mutt-send-email-mst@kernel.org>
Date:   Tue, 10 Jan 2017 16:51:03 +0200
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        john.r.fastabend@...el.com, netdev@...r.kernel.org,
        alexei.starovoitov@...il.com, daniel@...earbox.net
Subject: Re: [net PATCH] net: virtio: cap mtu when XDP programs are running

On Tue, Jan 10, 2017 at 04:51:34AM +0200, Michael S. Tsirkin wrote:
> XDP seems to have a bunch of weird restrictions, I just
> do not like it that the logic spills out to all drivers.
> What if someone decides to extend it to two pages in the future?
> Recode it all in all drivers ...
> 
> Why can't net core enforce mtu?

And BTW limits on MTU are a problem that will have to be
addressed sooner or later, disabling offloads on the NIC
is one thing, but reconfiguring all of the network
with a lower MTU is another.


> -- 
> MST