netdev - Re: [PATCH RFC bpf-next v1 5/6] net: netfilter: Add unstable CT lookup helper for XDP and TC-BPF

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Message-ID: <20211102231905.5q6jdddyrobny63b@ast-mbp.dhcp.thefacebook.com>
Date:   Tue, 2 Nov 2021 16:19:05 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH RFC bpf-next v1 5/6] net: netfilter: Add unstable CT
 lookup helper for XDP and TC-BPF

On Sun, Oct 31, 2021 at 08:10:45PM +0100, Florian Westphal wrote:
> 
> Depending on meaning of "unstable helper" this
> is ok and can be changed in incompatible way later.

"unstable helper" means that it's not part of uapi.
All kfuncs are like that. They can and will change.
bpf progs that call them would have to adjust.
Just like bpf progs that read kernel data and walk kernel types.