netdev - Re: macvtap: Limit packet queue length

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Date:	Thu, 22 Jul 2010 08:59:58 -0700
From:	Shirley Ma <mashirle@...ibm.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>, Mark Wagner <mwagner@...hat.com>
Subject: Re: macvtap: Limit packet queue length

On Thu, 2010-07-22 at 14:41 +0800, Herbert Xu wrote:
>  {
>         struct macvtap_queue *q = macvtap_get_queue(dev, skb);
>         if (!q)
> -               return -ENOLINK;
> +               goto drop;
> +
> +       if (skb_queue_len(&q->sk.sk_receive_queue) >=
> dev->tx_queue_len)
> +               goto drop;
> 

Do we need to orphan skb here, just like tun?

>         skb_queue_tail(&q->sk.sk_receive_queue, skb);
>         wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN |
> POLLRDNORM | POLLRDBAND);
> -       return 0;
> +       return NET_RX_SUCCESS;
> +
> +drop:

Do we need to increase dropped++ counter here to let user know there are
packets dropped?

> +       kfree_skb(skb);
> +       return NET_RX_DROP;
>  }
> 
> 

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