netdev - Re: [PATCH bpf-next] bpf: support SO_DEBUG in bpf

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Date:   Sun, 3 Feb 2019 15:36:53 -0800
From:   Y Song <ys114321@...il.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     Martin KaFai Lau <kafai@...com>, brakmo@...com,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>, shaoyafang@...iglobal.com
Subject: Re: [PATCH bpf-next] bpf: support SO_DEBUG in bpf_setsockopt()

On Sun, Feb 3, 2019 at 12:18 AM Yafang Shao <laoar.shao@...il.com> wrote:
>
> Then we can enable/disable socket debugging without modifying user code.
> That is more convenient for debugging.
>
> Signed-off-by: Yafang Shao <laoar.shao@...il.com>

Acked-by: Yonghong Song <yhs@...com>

> ---
>  include/net/sock.h | 8 ++++++++
>  net/core/filter.c  | 3 +++
>  net/core/sock.c    | 8 --------
>  3 files changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 2b229f7..8decee9 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -1935,6 +1935,14 @@ static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n)
>         }
>  }
>
> +static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
> +{
> +       if (valbool)
> +               sock_set_flag(sk, bit);
> +       else
> +               sock_reset_flag(sk, bit);
> +}
> +
>  bool sk_mc_loop(struct sock *sk);
>
>  static inline bool sk_can_gso(const struct sock *sk)
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 3a49f68..ce5da57 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4111,6 +4111,9 @@ static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
>
>                 /* Only some socketops are supported */
>                 switch (optname) {
> +               case SO_DEBUG:
> +                       sock_valbool_flag(sk, SOCK_DBG, val);
> +                       break;
>                 case SO_RCVBUF:
>                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
>                         sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 900e8a9..5ef6daa 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -638,14 +638,6 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
>         return ret;
>  }
>
> -static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
> -{
> -       if (valbool)
> -               sock_set_flag(sk, bit);
> -       else
> -               sock_reset_flag(sk, bit);
> -}
> -
>  bool sk_mc_loop(struct sock *sk)
>  {
>         if (dev_recursion_level())
> --
> 1.8.3.1
>