Re: [PATCH net-next 1/9] net-timestamp: add bpf infrastructure to allow exposing more information later

[Kuniyuki Iwashima <kuniyu@amazon.com>]

From: Jason Xing <kerneljasonxing@gmail.com>
Date: Tue,  8 Oct 2024 17:51:01 +0800
> From: Jason Xing <kernelxing@tencent.com>
> 
> Implement basic codes so that we later can easily add each tx points.
> Introducing BPF_SOCK_OPS_ALL_CB_FLAGS used as a test statement can help use
> control whether to output or not.
> 
> Signed-off-by: Jason Xing <kernelxing@tencent.com>
> ---
>  include/uapi/linux/bpf.h       |  5 ++++-
>  net/core/skbuff.c              | 18 ++++++++++++++++++
>  tools/include/uapi/linux/bpf.h |  5 ++++-
>  3 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> index c6cd7c7aeeee..157e139ed6fc 100644
> --- a/include/uapi/linux/bpf.h
> +++ b/include/uapi/linux/bpf.h
> @@ -6900,8 +6900,11 @@ enum {
>  	 * options first before the BPF program does.
>  	 */
>  	BPF_SOCK_OPS_WRITE_HDR_OPT_CB_FLAG = (1<<6),
> +	/* Call bpf when the kernel is generating tx timestamps.
> +	 */
> +	BPF_SOCK_OPS_TX_TIMESTAMPING_OPT_CB_FLAG = (1<<7),
>  /* Mask of all currently supported cb flags */
> -	BPF_SOCK_OPS_ALL_CB_FLAGS       = 0x7F,
> +	BPF_SOCK_OPS_ALL_CB_FLAGS       = 0xFF,

I remember this change makes two selftests fail and needs diff
in this link.
https://lore.kernel.org/bpf/20231016161134.25365-1-kuniyu@amazon.com/

Also, adding a bpf selftest or extending some for this series
would be nice.