netdev - Re: [PATCH net-next 5/5] ipv4: use indirect call wrappers for {tcp,udp}

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Date:   Mon, 1 Jul 2019 15:07:00 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 5/5] ipv4: use indirect call wrappers for {tcp,udp}_{recv,send}msg()

On Mon, Jul 1, 2019 at 1:10 PM Paolo Abeni <pabeni@...hat.com> wrote:
>
> This avoids an indirect call per syscall for common ipv4 transports
>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>  net/ipv4/af_inet.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index 8421e2f5bbb3..9a2f17d0c5f5 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -797,6 +797,8 @@ int inet_send_prepare(struct sock *sk)
>  }
>  EXPORT_SYMBOL_GPL(inet_send_prepare);
>
> +INDIRECT_CALLABLE_DECLARE(int udp_sendmsg(struct sock *, struct msghdr *,
> +                                         size_t));

Small nit: this is already defined in include/net/udp.h, which is
included. So like tcp_sendmsg, probably no need to declare.

If defining inet6_sendmsg and inet6_recvmsg in include/net/ipv6.h,
perhaps do the same for the other missing functions, instead of these
indirect declarations at the callsite?

Aside from that small point, patch set looks great to me. Thanks Paolo.

Acked-by: Willem de Bruijn <willemb@...gle.com>