From: "Michael S. Tsirkin" <mst@redhat.com>
To: David Ahern <dahern@digitalocean.com>
Cc: "Jason Wang" <jasowang@redhat.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>
Date: Wed, 26 Feb 2020 04:33:30 -0500 [thread overview]
Message-ID: <20200226093330.GA711395@redhat.com> (raw)
Bcc:
Subject: Re: virtio_net: can change MTU after installing program
Message-ID: <20200226043257-mutt-send-email-mst@kernel.org>
Reply-To:
In-Reply-To: <7df5bb7f-ea69-7673-642b-f174e45a1e64@digitalocean.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
next reply other threads:[~2020-02-26 9:37 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-26 9:33 Michael S. Tsirkin [this message]
2020-02-26 3:32 ` virtio_net: can change MTU after installing program David Ahern
2020-02-26 4:02 ` Jason Wang
2020-02-26 4:31 ` David Ahern
2020-02-26 5:53 ` Jason Wang
2020-02-26 16:04 ` David Ahern
2020-02-26 7:07 ` Michael S. Tsirkin
2020-02-26 7:37 ` Jason Wang
2020-02-26 8:39 ` Michael S. Tsirkin
2020-02-26 9:30 ` Jason Wang
2020-02-26 9:36 ` Michael S. Tsirkin
2020-02-26 16:08 ` David Ahern
2020-02-26 16:56 ` Michael S. Tsirkin
2020-02-26 9:51 ` Toke Høiland-Jørgensen
2020-02-26 16:03 ` David Ahern
2020-02-26 16:55 ` Michael S. Tsirkin
2020-02-26 16:58 ` David Ahern
2020-02-26 17:02 ` Michael S. Tsirkin
2020-02-27 1:37 ` Jakub Kicinski
2020-02-27 8:14 ` Michael S. Tsirkin
2020-02-27 17:16 ` Jakub Kicinski
2020-02-27 19:26 ` Michael Chan
2020-02-27 19:45 ` Jakub Kicinski
2020-02-27 21:37 ` David Ahern
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