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

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Message-ID: <7e08dd3b-726d-3b1b-9db7-eddb21773817@kernel.org>
Date: Fri, 28 Jul 2023 09:42:10 -0600
From: David Ahern <dsahern@...nel.org>
To: nicolas.dichtel@...nd.com, Stephen Hemminger
 <stephen@...workplumber.org>, Hangbin Liu <liuhangbin@...il.com>
Cc: 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>, Thomas Haller <thaller@...hat.com>
Subject: Re: [PATCH net-next] ipv4/fib: send RTM_DELROUTE notify when flush
 fib

On 7/28/23 7:01 AM, Nicolas Dichtel wrote:
> Frankly, it's quite complex, there are corner cases.

yes there are.
> 
> When an interface is set down, the routes associated to this interface should be
> removed. This is the simple part.
> But for ecmp routes, there are several cases:
>  - if all nh use this interface: the routes are deleted by the kernel;
>  - if only some nh uses this interface :
>    + if all other nh already point to a down interface: the route are deleted by
> the kernel;
>    + if at least one nh points to an up interface: the nh are temporarily disabled.
> 
> Managing a cache with this is not so obvious 😉

FRR works well with Linux at this point, and libnl's caching was updated
ad fixed by folks from Cumulus Networks so it should be a good too.