Re: [PATCH net-next 02/13] sk_buff: add skb extension infrastructure

[Eric Dumazet]

On 12/13/2018 02:39 AM, Florian Westphal wrote:
>
> Thats whats done in the MPTCP out-of-tree implementation, but I don't
> think its needed.
> 
> It could just delete the extension before ->queue_xmit() AFAIU.

So, cloning would do an refcount_inc(), and deleting the extension would do an 
refcount_dec_and_test() ?

That is what I called an extra pair of atomic operations.