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Date: Wed, 26 Feb 2020 04:33:30 -0500 From: "Michael S. Tsirkin" <mst@...hat.com> To: David Ahern <dahern@...italocean.com> Cc: Jason Wang <jasowang@...hat.com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, Toke Høiland-Jørgensen <toke@...hat.com> Bcc: Subject: Re: virtio_net: can change MTU after installing program Message-ID: <20200226043257-mutt-send-email-mst@...nel.org> Reply-To: In-Reply-To: <7df5bb7f-ea69-7673-642b-f174e45a1e64@...italocean.com> On Tue, Feb 25, 2020 at 08:32:14PM -0700, David Ahern wrote: > Another issue is that virtio_net checks the MTU when a program is > installed, but does not restrict an MTU change after: > > # ip li sh dev eth0 > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 xdp qdisc fq_codel > state UP mode DEFAULT group default qlen 1000 > link/ether 5a:39:e6:01:a5:36 brd ff:ff:ff:ff:ff:ff > prog/xdp id 13 tag c5595e4590d58063 jited > > # ip li set dev eth0 mtu 8192 > > # ip li sh dev eth0 > 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8192 xdp qdisc fq_codel > state UP mode DEFAULT group default qlen 1000 > > Cc Toke who has tested this on other cards and has some input. -- MST
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