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

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Date:	Thu, 23 Apr 2015 17:32:29 -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 14:29 -0700, Mahesh Bandewar wrote:

> +static void ipvlan_multicast_enqueue(struct ipvl_port *port,
> +				     struct sk_buff *skb)
> +{
> +	if (skb->protocol == htons(ETH_P_PAUSE))
> +		return;

But what happens to this packet ? It seems leaked ?

> +
> +	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);
> +	} else {
> +		spin_unlock(&port->backlog.lock);
> +		atomic_long_inc(&skb->dev->rx_dropped);
> +		kfree_skb(skb);
> +	}
> +	schedule_work(&port->wq);

No point calling schedule_work(&port->wq); if packet was dropped.

We are under pressure, so don't add extra cpu cycles ;)


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