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Groups > linux.kernel > #1506622
| From | Jarod Wilson <jarod@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" |
| Date | 2016-10-23 03:10 +0200 |
| Message-ID | <svfst-2ye-7@gated-at.bofh.it> (permalink) |
| References | <suZe2-rP-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Sat, Oct 22, 2016 at 09:46:24AM +0200, Sven Eckelmann wrote:
> The maximum MTU is defined via the slave devices of an batman-adv
> interface. Thus it is not possible to calculate the max_mtu during the
> creation of the batman-adv device when no slave devices are attached. Doing
> so would for example break non-fragmentation setups which then
> (incorrectly) allow an MTU of 1500 even when underlying device cannot
> transport 1500 bytes + batman-adv headers.
>
> Checking the dynamically calculated max_mtu via the minimum of the slave
> devices MTU during .ndo_change_mtu is also used by the bridge interface.
>
> Cc: Jarod Wilson <jarod@redhat.com>
> Fixes: b3e3893e1253 ("net: use core MTU range checking in misc drivers")
> Signed-off-by: Sven Eckelmann <sven@narfation.org>
> ---
> Original patch + my comment: https://patchwork.ozlabs.org/patch/684722/
>
> I just got informed about this patch when it was already applied in net-next.
> So I can only ask for an revet of the batman-adv parts
Apologies, I tried to cc everyone I could find in MAINTAINERS, but your
name wasn't one of the three listed for batman devices. You're going to
need more than just this revert though, since batman-adv calls
ether_setup, which will set min_mtu = 68, max_mtu = 1500, unless
batadv_hardif_min_mtu() always returns something 1500 or less. Actually,
looking at that, you could omit the mtu < 68 bit from
batadv_interface_change_mtu() too, since that'll already get done in the
core, but I have no clue what you need for max_mtu.
--
Jarod Wilson
jarod@redhat.com
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[PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" Sven Eckelmann <sven@narfation.org> - 2016-10-22 09:50 +0200
Re: [PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" Jarod Wilson <jarod@redhat.com> - 2016-10-23 03:10 +0200
Re: [PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" Sven Eckelmann <sven@narfation.org> - 2016-10-23 09:20 +0200
Re: [PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" Jarod Wilson <jarod@redhat.com> - 2016-10-24 03:50 +0200
Re: [PATCH] batman-adv: Revert "use core MTU range checking in misc drivers" David Miller <davem@davemloft.net> - 2016-10-26 23:30 +0200
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