netdev - Re: [PATCH bpf-next 3/4] net: refactor arguments of inet{,6}

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Date:   Tue, 5 May 2020 11:16:34 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.com>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <davem@...emloft.net>, <ast@...nel.org>, <daniel@...earbox.net>,
        Andrey Ignatov <rdna@...com>
Subject: Re: [PATCH bpf-next 3/4] net: refactor arguments of inet{,6}_bind

On Mon, May 04, 2020 at 10:34:29AM -0700, Stanislav Fomichev wrote:
> The intent is to add an additional bind parameter in the next commit.
> Instead of adding another argument, let's convert all existing
> flag arguments into an extendable bit field.
> 
> No functional changes.
> 
> Cc: Andrey Ignatov <rdna@...com>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  include/net/inet_common.h |  6 +++++-
>  include/net/ipv6_stubs.h  |  2 +-
>  net/core/filter.c         |  6 ++++--
>  net/ipv4/af_inet.c        | 10 +++++-----
>  net/ipv6/af_inet6.c       | 10 +++++-----
>  5 files changed, 20 insertions(+), 14 deletions(-)
> 
> diff --git a/include/net/inet_common.h b/include/net/inet_common.h
> index ae2ba897675c..a0fb68f5bf59 100644
> --- a/include/net/inet_common.h
> +++ b/include/net/inet_common.h
> @@ -35,8 +35,12 @@ int inet_shutdown(struct socket *sock, int how);
>  int inet_listen(struct socket *sock, int backlog);
>  void inet_sock_destruct(struct sock *sk);
>  int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
> +// Don't allocate port at this moment, defer to connect.
nit. stay with /* ... */

> +#define BIND_FORCE_ADDRESS_NO_PORT	(1 << 0)
> +// Grab and release socket lock.
> +#define BIND_WITH_LOCK			(1 << 1)