netdev - Re: [PATCH bpf-next v3 2/3] libbpf: add low level TC-BPF API

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Message-ID: <CAMhR0U1DRBw5AjzzLfN+bpnxsrONO_Jkr9p57yfeyCND+qMAtQ@mail.gmail.com>
Date:   Thu, 22 Apr 2021 10:47:50 +0100
From:   Shaun Crampton <shaun@...era.io>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>, bpf@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 2/3] libbpf: add low level TC-BPF API

> Nope, just get it from the prog itself.

Looks like the API returns the prog ID, so from that we can look up the prog
and then get its tag? If so that meets our needs.  Alternatively, if
the API allows
for atomic replacement of a BPF program with another, that'd also work for us.

The use case is that our daemon is restarted and it doesn't know what BPF
program was previously loaded. We want to make sure we end up with the
latest version loaded, either by doing a seamless replace with the
latest version
or by checking if the loaded version matches the latest.