Re: [Xen-devel] BUG: jumbo frames broken after commit xen-netfront: Fix race between device setup and open

[Liam Shepherd <liam@xxxxxxxxx>]

> The patch "xen-netfront: Fix race between device setup and open" seems
> to have introduced a regression preventing setting MTU's larger than
> 1500. We experienced this downstream with Container Linux and
> confirmed with Fedora 28 as well.
>
> It's commit f599c64fdf7d9c108e8717fb04bc41c680120da4 in the linux-stable tree.
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=f599c64fdf7d9c108e8717fb04bc41c680120da4
>
> Downstream bugs:
> https://github.com/coreos/bugs/issues/2443
> https://bugzilla.redhat.com/show_bug.cgi?id=1584216
>
> We've confirmed that reverting that commit fixes the bug. It be
> reliably can be reproduced on AWS with t2.micro instances (and
> presumably other systems using the same driver). Both using
> systemd-networkd to set the mtu and manual ip link commands cause the
> link to repsond with "Invalid argument" when trying to set the MTU >
> 1500.

Sorry for the spam, but this issue I believe this issue is linked with: https://lists.xenproject.org/archives/html/xen-devel/2018-06/msg00254.html

Thanks

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