netdev - Re: [PATCH v2 net-next 2/7] rtnetlink: Add peer_type in struct rtnl_link

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Message-ID: <ZytG8LySPklk4ZOW@penguin>
Date: Wed, 6 Nov 2024 12:37:36 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Vincent Mailhol <mailhol.vincent@...adoo.fr>,
	Daniel Borkmann <daniel@...earbox.net>,
	Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 2/7] rtnetlink: Add peer_type in struct
 rtnl_link_ops.

On Tue, Nov 05, 2024 at 06:24:27PM -0800, Kuniyuki Iwashima wrote:
> In ops->newlink(), veth, vxcan, and netkit call rtnl_link_get_net() with
> a net pointer, which is the first argument of ->newlink().
> 
> rtnl_link_get_net() could return another netns based on IFLA_NET_NS_PID
> and IFLA_NET_NS_FD in the peer device's attributes.
> 
> We want to get it and fill rtnl_nets->nets[] in advance in rtnl_newlink()
> for per-netns RTNL.
> 
> All of the three get the peer netns in the same way:
> 
>   1. Call rtnl_nla_parse_ifinfomsg()
>   2. Call ops->validate() (vxcan doesn't have)
>   3. Call rtnl_link_get_net()
> 
> Let's add a new field peer_type to struct rtnl_link_ops and prefetch
> netns in the peer ifla to add it to rtnl_nets in rtnl_newlink().
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> Reviewed-by: Eric Dumazet <edumazet@...gle.com>
> ---
> v2:
>   * Rename the helper to rtnl_link_get_net_ifla()
>   * Unexport rtnl_link_get_net_ifla() and made it static
>   * Change peer_type to u16
>   * squash patch 2 & 3 (due to static requires a user)
> ---
>  include/net/rtnetlink.h |  2 ++
>  net/core/rtnetlink.c    | 55 ++++++++++++++++++++++++++++++++++++++---
>  2 files changed, 53 insertions(+), 4 deletions(-)
> 
 
Reviewed-by: Nikolay Aleksandrov <razor@...ckwall.org>