netdev - Re: [PATCH net-next 09/11] can: gw: switch cangw_pernet

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Date:   Mon, 7 Feb 2022 18:41:40 +0100
From:   Oliver Hartkopp <socketcan@...tkopp.net>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>, David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: Re: [PATCH net-next 09/11] can: gw: switch cangw_pernet_exit() to
 batch mode



On 07.02.22 18:17, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> cleanup_net() is competing with other rtnl users.
> 
> Avoiding to acquire rtnl for each netns before calling
> cgw_remove_all_jobs() gives chance for cleanup_net()
> to progress much faster, holding rtnl a bit longer.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Oliver Hartkopp <socketcan@...tkopp.net>
> Cc: Marc Kleine-Budde <mkl@...gutronix.de>
> ---
>   net/can/gw.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/net/can/gw.c b/net/can/gw.c
> index d8861e862f157aec36c417b71eb7e8f59bd064b9..24221352e059be9fb9aca3819be6a7ac4cdef144 100644
> --- a/net/can/gw.c
> +++ b/net/can/gw.c
> @@ -1239,16 +1239,19 @@ static int __net_init cangw_pernet_init(struct net *net)
>   	return 0;
>   }
>   
> -static void __net_exit cangw_pernet_exit(struct net *net)
> +static void __net_exit cangw_pernet_exit_batch(struct list_head *net_list)
>   {
> +	struct net *net;
> +
>   	rtnl_lock();
> -	cgw_remove_all_jobs(net);
> +	list_for_each_entry(net, net_list, exit_list)
> +		cgw_remove_all_jobs(net);

Instead of removing the jobs for ONE net namespace it seems you are 
remove removing the jobs for ALL net namespaces?

Looks wrong to me.

Best regards,
Oliver


>   	rtnl_unlock();
>   }
>   
>   static struct pernet_operations cangw_pernet_ops = {
>   	.init = cangw_pernet_init,
> -	.exit = cangw_pernet_exit,
> +	.exit_batch = cangw_pernet_exit_batch,
>   };
>   
>   static __init int cgw_module_init(void)