netdev - Re: [PATCH net-next 2/3 v2] net: ipv4 sysctl option to ignore routes when nexthop link is down

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Message-ID: <20150611022309.GU588@gospo.home.greyhouse.net>
Date:	Wed, 10 Jun 2015 22:23:09 -0400
From:	Andy Gospodarek <gospo@...ulusnetworks.com>
To:	Scott Feldman <sfeldma@...il.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>, ddutt@...ulusnetworks.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	"stephen@...workplumber.org" <stephen@...workplumber.org>
Subject: Re: [PATCH net-next 2/3 v2] net: ipv4 sysctl option to ignore routes
 when nexthop link is down

On Wed, Jun 10, 2015 at 07:18:59PM -0700, Scott Feldman wrote:
> On Wed, Jun 10, 2015 at 7:12 PM, Scott Feldman <sfeldma@...il.com> wrote:
> > On Tue, Jun 9, 2015 at 11:47 PM, Andy Gospodarek
> > <gospo@...ulusnetworks.com> wrote:
> >
> >>  /* /proc/sys/net/ipv4/netfilter */
> >> diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
> >> index 7e7746a..c9d0a0e 100644
> >> --- a/kernel/sysctl_binary.c
> >> +++ b/kernel/sysctl_binary.c
> >> @@ -253,6 +253,7 @@ static const struct bin_table bin_net_ipv4_conf_vars_table[] = {
> >>         { CTL_INT,      NET_IPV4_CONF_NOPOLICY,                 "disable_policy" },
> >>         { CTL_INT,      NET_IPV4_CONF_FORCE_IGMP_VERSION,       "force_igmp_version" },
> >>         { CTL_INT,      NET_IPV4_CONF_PROMOTE_SECONDARIES,      "promote_secondaries" },
> >> +       { CTL_INT,      NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN,      "ignore_routes_with_linkdown" },
> >
> > Would "route_ignore_linkdown_nexthops" be a more accurate name?  The
> > patch marks link-downed nexthops to be ignored, not the route,
> > correct?
> >
> > s/NET_IPV4_CONF_IGNORE_ROUTES_WITH_LINKDOWN/NET_IPV4_CONF_ROUTE_IGNORE_LINKDOWN_NEXTHOPS
> 
> Something like that.  Not sure I like my suggestion.  If dev is
> nexthop dev in route, and dev is link down, exclude nexthop in route
> lookup.

I actually played around with a bunch of different names and this was as
short as I could get it while still conveying the point.  I'm getting
ready to submit v3, so speak now if you really do hate the name proposed
in v2.

> route_exclude_if_linkdown_nexthop_dev?

Not bad, but you see what I mean about it being a mouthful.  :)

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