netdev - Re: [PATCH bpf-next v4 0/4] XDP: Support atomic replacement of XDP interface attachments

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Message-ID: <20200325174647.4u2pfqvefmosbb2x@ast-mbp>
Date:   Wed, 25 Mar 2020 10:46:47 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Lorenz Bauer <lmb@...udflare.com>, Andrey Ignatov <rdna@...com>
Subject: Re: [PATCH bpf-next v4 0/4] XDP: Support atomic replacement of XDP
 interface attachments

On Wed, Mar 25, 2020 at 06:23:25PM +0100, Toke Høiland-Jørgensen wrote:
> This series adds support for atomically replacing the XDP program loaded on an
> interface. This is achieved by means of a new netlink attribute that can specify
> the expected previous program to replace on the interface. If set, the kernel
> will compare this "expected id" attribute with the program currently loaded on
> the interface, and reject the operation if it does not match.
> 
> With this primitive, userspace applications can avoid stepping on each other's
> toes when simultaneously updating the loaded XDP program.
> 
> Changelog:
> 
> v4:
> - Switch back to passing FD instead of ID (Andrii)
> - Rename flag to XDP_FLAGS_REPLACE (for consistency with other similar uses)

please stop resending the set without concluding the previous three! discussion threads.
It's already hard enough for people to follow.