netdev - Re: [PATCH bpf 1/2] libbpf: Fix type of old_fd in bpf_xdp_set_link

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Date:   Tue, 14 Apr 2020 13:47:21 -0600
From:   David Ahern <dsahern@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        daniel@...earbox.net, ast@...com
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH bpf 1/2] libbpf: Fix type of old_fd in
 bpf_xdp_set_link_opts

On 4/14/20 8:50 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 <dsahern@...il.com>
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> ---
>  tools/lib/bpf/libbpf.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 44df1d3e7287..f1dacecb1619 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -458,7 +458,7 @@ struct xdp_link_info {
>  
>  struct bpf_xdp_set_link_opts {
>  	size_t sz;
> -	__u32 old_fd;
> +	int old_fd;
>  };
>  #define bpf_xdp_set_link_opts__last_field old_fd
>  
> 

int is much better. Thanks,

Acked-by: David Ahern <dsahern@...il.com>