netdev - Re: [RFC PATCH v3 01/10] udp: implement complete book-keeping for encap

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Message-ID: <CAF=yD-KMU9+UvL-UNFnZth31O+NzGzdqFHNCq-QbSpZ4_qY86A@mail.gmail.com>
Date:   Thu, 1 Nov 2018 16:59:53 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        steffen.klassert@...unet.com,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: Re: [RFC PATCH v3 01/10] udp: implement complete book-keeping for encap_needed

On Tue, Oct 30, 2018 at 1:28 PM Paolo Abeni <pabeni@...hat.com> wrote:
>
> The *encap_needed static keys are enabled by UDP tunnels
> and several UDP encapsulations type, but they are never
> turned off. This can cause unneeded overall performance
> degradation for systems where such features are used
> transiently.
>
> This patch introduces complete book-keeping for such keys,
> decreasing the usage at socket destruction time, if needed,
> and avoiding that the same socket could increase the key
> usage multiple times.
>
> rfc v2 - rfc v3:
>  - use udp_tunnel_encap_enable() in setsockopt()
>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

> @@ -2447,7 +2452,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
>                         /* FALLTHROUGH */
>                 case UDP_ENCAP_L2TPINUDP:
>                         up->encap_type = val;
> -                       udp_encap_enable();
> +                       udp_tunnel_encap_enable(sk->sk_socket);

this now also needs lock_sock?