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

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Message-ID: <CAF2d9jh_O0-uceNq=AP5rqPm9xcn=9y8bVxMD-2EiJ3bD_mZsQ@mail.gmail.com>
Date:   Wed, 14 Dec 2022 21:34:00 -0800
From:   Mahesh Bandewar (महेश बंडेवार) 
        <maheshb@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Decotigny <decot+git@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nikolay Aleksandrov <razor@...ckwall.org>,
        David Ahern <dsahern@...nel.org>,
        "Denis V. Lunev" <den@...nvz.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        David Decotigny <ddecotig@...gle.com>,
        Yuwei Wang <wangyuweihx@...il.com>,
        Alexander Mikhalitsyn <alexander.mikhalitsyn@...tuozzo.com>,
        Thomas Zeitlhofer <thomas.zeitlhofer+lkml@...it.at>
Subject: Re: [PATCH v1 1/1] net: neigh: persist proxy config across link flaps

On Wed, Dec 14, 2022 at 8:49 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon, 12 Dec 2022 23:38:01 -0800 David Decotigny wrote:
> > From: David Decotigny <ddecotig@...gle.com>
> >
> > Without this patch, the 'ip neigh add proxy' config is lost when the
> > cable or peer disappear, ie. when the link goes down while staying
> > admin up. When the link comes back, the config is never recovered.
> >
> > This patch makes sure that such an nd proxy config survives a switch
> > or cable issue.
>
> Hm, how does this square with the spirit of 859bd2ef1fc11 ?
>
Devid's (Decotigny) patch is adding the distinction between admin-down
from carrier-off which could be transient. So in my belief, it's
correcting / enhancing the behavior that David (Ahern) introduced but
we can hear from David himself :)

> Would be great to hear from David, IDK if he's around or off until
> next year.