netdev - Re: [PATCH net-next] ipv4/fib: send RTM

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Date: Wed, 13 Sep 2023 08:43:18 -0600
From: David Ahern <dsahern@...nel.org>
To: nicolas.dichtel@...nd.com, Hangbin Liu <liuhangbin@...il.com>
Cc: Thomas Haller <thaller@...hat.com>, Benjamin Poirier
 <bpoirier@...dia.com>, Stephen Hemminger <stephen@...workplumber.org>,
 Ido Schimmel <idosch@...sch.org>, netdev@...r.kernel.org,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next] ipv4/fib: send RTM_DELROUTE notify when flush
 fib

On 9/13/23 8:11 AM, Nicolas Dichtel wrote:
> The compat_mode was introduced for daemons that doesn't support the nexthop
> framework. There must be a notification (RTM_DELROUTE) when a route is deleted
> due to a carrier down event. Right now, the backward compat is broken.

The compat_mode is for daemons that do not understand the nexthop id
attribute, and need the legacy set of attributes for the route - i.e,
expand the nexthop information when sending messages to userspace.