Re: [PATCH v1 1/1] net: neigh: persist proxy config across link flaps

[David Decotigny]

(answer below)

On Thu, Dec 15, 2022 at 11:05 AM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
>
> On Wed, 14 Dec 2022 22:18:04 -0800 David Decotigny wrote:
> > I don't think this patch is changing that part of the behavior: we still
> > flush the cached nd entries when the link flaps. What we don't remove are
> > the pneigh_entry-es (ip neigh add proxy ...) attached to the device where
> > the link flaps: those are configured once and this patch ensures that they
> > survive the link flaps as long as the netdev stays admin-up. When
> > the netdev is brought admin-down, we keep the behavior we had before the
> > patch.
>
> Makes sense. This is not urgent, tho, right?

Not that kind of urgent.

FTR, in the v2 you suggested to use NUD_PERMANENT, I can try to see
how this would look like. Note that this will make the patch larger
and more intrusive, and with potentially a behavior change for whoever
uses the netlink API directly instead of the iproute2 implementation
for ip neigh X proxy things.

>
> David A, do you agree and should we treat this as a fix with
>
> Fixes: 859bd2ef1fc1 ("net: Evict neighbor entries on carrier down")

Thanks.

>
> added?
>
> Reminder: please bottom post on the list