netdev - Re: [PATCH RFC net-next] virtio_net: Relax queue requirement for using XDP

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Message-ID: <87o8tlzppw.fsf@toke.dk>
Date:   Wed, 26 Feb 2020 10:02:03 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     David Ahern <dsahern@...il.com>, Jason Wang <jasowang@...hat.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org,
        David Ahern <dahern@...italocean.com>
Subject: Re: [PATCH RFC net-next] virtio_net: Relax queue requirement for using XDP

"Michael S. Tsirkin" <mst@...hat.com> writes:

> On Wed, Feb 26, 2020 at 09:34:51AM +0100, Toke Høiland-Jørgensen wrote:
>> we already do block some reconfiguration if an XDP program is loaded
>> (such as MTU changes), so there is some precedence for that :)
> Do we really block MTU changes when XDP is loaded?
> Seems to work for me - there's a separate discussion going
> on about how to handle MTU changes - see
> https://lore.kernel.org/r/7df5bb7f-ea69-7673-642b-f174e45a1e64@digitalocean.com
> 	virtio_net: can change MTU after installing program

Maybe not for virtio_net, but that same thing doesn't work on mlx5:

$ sudo ip link set dev ens1f1 mtu 8192
RTNETLINK answers: Invalid argument

-Toke