netdev - Re: [PATCH v4 1/3] VSOCK: Add vsockmon tap functions

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Message-ID: <F612F48C-8072-4588-B38A-2F366F53040A@vmware.com>
Date:   Thu, 20 Apr 2017 12:27:37 +0000
From:   "Jorgen S. Hansen" <jhansen@...are.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Gerard Garcia <ggarcia@...a.uab.cat>
Subject: Re: [PATCH v4 1/3] VSOCK: Add vsockmon tap functions


> On Apr 13, 2017, at 6:18 PM, Stefan Hajnoczi <stefanha@...hat.com> wrote:
> 
> +
> +static void __vsock_deliver_tap(struct sk_buff *skb)
> +{
> +	int ret;
> +	struct vsock_tap *tmp;
> +
> +	list_for_each_entry_rcu(tmp, &vsock_tap_all, list) {
> +		ret = __vsock_deliver_tap_skb(skb, tmp->dev);
> +		if (unlikely(ret))
> +			break;
> +	}
> +
> +	consume_skb(skb);

It looks like the caller will allocate the skb regardless of whether vsock_tap_all is empty, so shouldn’t the skb be consumed in vsock_deliver_tap?

> +}
> +
> +void vsock_deliver_tap(struct sk_buff *skb)
> +{
> +	rcu_read_lock();
> +
> +	if (unlikely(!list_empty(&vsock_tap_all)))
> +		__vsock_deliver_tap(skb);
> +
> +	rcu_read_unlock();
> +}
> +EXPORT_SYMBOL_GPL(vsock_deliver_tap);
> -- 
> 2.9.3
>