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

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Message-ID: <20221215110544.7e832e41@kernel.org>
Date:   Thu, 15 Dec 2022 11:05:44 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     David Decotigny <ddecotig@...gle.com>,
        David Ahern <dsahern@...nel.org>
Cc:     "Mahesh Bandewar (महेश बंडेवार)" <maheshb@...gle.com>,
        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>,
        "Denis V. Lunev" <den@...nvz.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Chen Zhongjin <chenzhongjin@...wei.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, 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?

David A, do you agree and should we treat this as a fix with

Fixes: 859bd2ef1fc1 ("net: Evict neighbor entries on carrier down")

added?

Reminder: please bottom post on the list