netdev - Re: [PATCH v3 net-next 2/4] rtnetlink: Add per-netns RTNL.

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Message-ID: <CANn89iLYQLUXh7c1Yww30A-C-=4UiQtArU+jx+AMfYtW+_pn4w@mail.gmail.com>
Date: Sat, 5 Oct 2024 10:16:22 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next 2/4] rtnetlink: Add per-netns RTNL.

On Sat, Oct 5, 2024 at 12:11 AM Kuniyuki Iwashima <kuniyu@...zon.com> wrote:
>
> The goal is to break RTNL down into per-netns mutex.
>
> This patch adds per-netns mutex and its helper functions, rtnl_net_lock()
> and rtnl_net_unlock().
>
> rtnl_net_lock() acquires the global RTNL and per-netns RTNL mutex, and
> rtnl_net_unlock() releases them.
>
> We will replace 800+ rtnl_lock() with rtnl_net_lock() and finally removes
> rtnl_lock() in rtnl_net_lock().
>
> When we need to nest per-netns RTNL mutex, we will use __rtnl_net_lock(),
> and its locking order is defined by rtnl_net_lock_cmp_fn() as follows:
>
>   1. init_net is first
>   2. netns address ascending order
>
> Note that the conversion will be done under CONFIG_DEBUG_NET_SMALL_RTNL
> with LOCKDEP so that we can carefully add the extra mutex without slowing
> down RTNL operations during conversion.
>
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>