netdev - Re: [PATCH net-next] net: flush the softnet backlog in process context

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Date:   Thu, 25 Aug 2016 16:58:38 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        Tom Herbert <tom@...bertland.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net-next] net: flush the softnet backlog in process
 context

On Thu, 2016-08-25 at 07:47 -0700, Eric Dumazet wrote:
> On Thu, 2016-08-25 at 07:32 -0700, Eric Dumazet wrote:
> 
> > In a future patch, we could change this so that we kick
> > flush_all_backlogs() once for all devices, instead of one device at a
> > time.
> > 
> > We would not pass @dev anymore as a parameter and simply look at
> > skb->dev->reg_state to decide to remove packets from queues in
> > flush_backlog()
> 
> This would be something like :

This is actually a nice cleanup. I hope to test it later.

> diff --git a/net/core/dev.c b/net/core/dev.c
> index 7feae74ca928..793ace2c600f 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -4293,7 +4293,6 @@ int netif_receive_skb(struct sk_buff *skb)
>  EXPORT_SYMBOL(netif_receive_skb);
>  
>  struct flush_work {
> -	struct net_device *dev;
>  	struct work_struct work;
>  };

With 'dev' removal, I think we can use directly 'work_struct'  and avoid
'container_of' usage in flush_backlog().

Paolo