linux-kernel - Re: [PATCH] net: skb: move enum skb_drop

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Date:   Thu, 10 Mar 2022 19:54:29 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     menglong8.dong@...il.com
Cc:     dsahern@...nel.org, nhorman@...driver.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, davem@...emloft.net, imagedong@...cent.com,
        edumazet@...gle.com, talalahmad@...gle.com, keescook@...omium.org,
        alobakin@...me, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Mengen Sun <mengensun@...cent.com>,
        Hao Peng <flyingpeng@...cent.com>
Subject: Re: [PATCH] net: skb: move enum skb_drop_reason to uapi

On Fri, 11 Mar 2022 11:28:28 +0800 menglong8.dong@...il.com wrote:
> From: Menglong Dong <imagedong@...cent.com>
> 
> Move the definition of 'enum skb_drop_reason' in 'skbuff.h' to the uapi
> header 'net_dropmon.h', therefore some users, such as eBPF program, can
> make use of it.

BPF does not need an enum definition to be part of the uAPI to make use
of it. BTF should encode the values, and CO-RE can protect from them
changing, AFAIU. I think we need a better example user / justification.