netdev - Re: [PATCH next 1/3] ipvlan: Defer multicast / broadcast processing to a work-queue

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Date:	Thu, 23 Apr 2015 20:04:06 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mahesh Bandewar <maheshb@...gle.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Dan Willems <dcbw@...hat.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH next 1/3] ipvlan: Defer multicast / broadcast processing
 to a work-queue

On Thu, 2015-04-23 at 19:54 -0700, Mahesh Bandewar wrote:

> The only possibility of schedule_work() while doing kfree_skb() is
> when the queue limit is reached. How can the queue be reduced if not
> scheduled? May be I'm missing something..


What is the point calling schedule_work() if you queued no packet at
this round ? 

Do you really think it will expedite the queue drain ?

Just write instead :


     spin_lock(&port->backlog.lock);
     if (skb_queue_len(&port->backlog) < IPVLAN_QBACKLOG_LIMIT) {
             __skb_queue_tail(&port->backlog, skb);
             spin_unlock(&port->backlog.lock);
     	     schedule_work(&port->wq);
     } else {
             spin_unlock(&port->backlog.lock);
             atomic_long_inc(&skb->dev->rx_dropped);
             kfree_skb(skb);
     }




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