netdev - Re: [PATCH net-next] vxlan: add support for flowlabel inherit

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Date: Sat, 30 Sep 2023 20:16:13 +0200
From: alce@...ranque.net
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, David Ahern
 <dsahern@...nel.org>, Ido Schimmel <idosch@...dia.com>,
 netdev@...r.kernel.org, vincent@...nat.ch
Subject: Re: [PATCH net-next] vxlan: add support for flowlabel inherit

Le 2023-09-30 17:29, Eric Dumazet a écrit :
> Side question : How can "flowlabel inherit" can be turned off later
> with an "ip link change ..." ?
> 
> It seems vxlan_nl2flag() would always turn it 'on' for NLA_FLAG type :
> 
> if (vxlan_policy[attrtype].type == NLA_FLAG)
>     flags = conf->flags | mask;  // always turn on
> else if (nla_get_u8(tb[attrtype]))    // dead code for NLA_FLAG
>     flags = conf->flags | mask;
> else
>     flags = conf->flags & ~mask;
> 
> conf->flags = flags;

The "flow label inherit" cannot be turned off after the
interface has been created, we have followed the logic used by 
TTL_INHERIT.

If the behavior isn't meant to be, we can try to modify it.