On Thu, Mar 22, 2012 at 11:34:34AM -0700, Pravin B Shelar wrote:
> Fixed according to comments from Ben.
> v1-v2:
> - Do not allow larger mtu on internal device compared to
> non internal devices.
>
> --8<--------------------------cut here-------------------------->8--
>
> Internal device mtu does not influence mtu of other internal devices.
> So skip MTU update to other devices when internal device mtu is changed.
>
> Signed-off-by: Pravin B Shelar <pshe...@nicira.com>
I think that the comment on update_mtu() deserves an update, because
it does not mention the significance of 'new_port'.
I'm not sure that the following logic in update_mtu() is correct:
/* For non-internal port find new min mtu. */
new_port->mtu = dev_mtu;
p->min_mtu = find_min_mtu(p);
if (dev_mtu > p->min_mtu) {
return;
}
Suppose, for example, that we have non-internal port p0 with MTU 1500
and p1 with MTU 5000, so that p->min_mtu is 1500. Then p0's MTU goes
up to 9000. dev_mtu is 9000 and p->min_mtu changes to 5000, so we
should adjust all the internal ports to MTU 5000, but because 9000 >
5000 we just return without adjusting anything. (Is my logic
correct?) Perhaps the test should be "if (old_min_mtu !=
new_min_mtu)"?
I don't see anything that reassesses MTU when a port is deleted.
Should it? If the only low-MTU port gets deleted, then I would
naively expect OVS to raise all the internal device MTUs to the new
minimum MTU.
Thanks,
Ben.
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