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

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Message-ID: <aa403653-9d65-b997-414f-29024f7c528c@gmail.com>
Date:   Thu, 13 Dec 2018 02:58:48 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Florian Westphal <fw@...len.de>,
        Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, cpaasch@...le.com, peter.krystad@...el.com,
        mathew.j.martineau@...ux.intel.com
Subject: Re: [PATCH net-next 02/13] sk_buff: add skb extension infrastructure



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.