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Date:   Tue, 14 Apr 2020 15:24:28 -0700
From:   Song Liu <>
To:     Toke Høiland-Jørgensen <>
Cc:     Daniel Borkmann <>,
        Alexei Starovoitov <>, bpf <>,
        Networking <>,
        David Ahern <>
Subject: Re: [PATCH bpf 1/2] libbpf: Fix type of old_fd in bpf_xdp_set_link_opts

On Tue, Apr 14, 2020 at 9:20 AM Toke Høiland-Jørgensen <> wrote:
> The 'old_fd' parameter used for atomic replacement of XDP programs is
> supposed to be an FD, but was left as a u32 from an earlier iteration of
> the patch that added it. It was converted to an int when read, so things
> worked correctly even with negative values, but better change the
> definition to correctly reflect the intention.
> Fixes: bd5ca3ef93cd ("libbpf: Add function to set link XDP fd while specifying old program")
> Reported-by: David Ahern <>
> Signed-off-by: Toke Høiland-Jørgensen <>

Acked-by: Song Liu <>

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