netdev - Re: [PATCH net-next v1] net: evaluate net.conf.ipvX.all.ignore_routes_with

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Message-ID: <20201019175326.0e06b89d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 19 Oct 2020 17:53:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vincent Bernat <vincent@...nat.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>, netdev@...r.kernel.org,
        Andy Gospodarek <gospo@...ulusnetworks.com>,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net-next v1] net: evaluate
 net.conf.ipvX.all.ignore_routes_with_linkdown

On Sat, 17 Oct 2020 14:50:11 +0200 Vincent Bernat wrote:
> Introduced in 0eeb075fad73, the "ignore_routes_with_linkdown" sysctl
> ignores a route whose interface is down. It is provided as a
> per-interface sysctl. However, while a "all" variant is exposed, it
> was a noop since it was never evaluated. We use the usual "or" logic
> for this kind of sysctls.

> Without this patch, the two last lines would fail on H1 (the one using
> the "all" sysctl). With the patch, everything succeeds as expected.
> 
> Also document the sysctl in `ip-sysctl.rst`.
> 
> Fixes: 0eeb075fad73 ("net: ipv4 sysctl option to ignore routes when nexthop link is down")
> Signed-off-by: Vincent Bernat <vincent@...nat.ch>

I'm not hearing any objections, but I have two questions:
 - do you intend to merge it for 5.10 or 5.11? Because it has a fixes
   tag, yet it's marked for net-next. If we put it in 5.10 it may get
   pulled into stable immediately, knowing how things work lately.
 - we have other sysctls that use IN_DEV_CONF_GET(), 
   e.g. "proxy_arp_pvlan" should those also be converted?