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Date:   Mon, 31 Aug 2020 15:43:19 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, yhs@...com,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH bpf] bpf: refer to struct xdp_md in user space comments

On Thu, 20 Aug 2020 16:16:47 +0200 Daniel Borkmann wrote:
> On 8/19/20 9:27 PM, Jakub Kicinski wrote:
> > uAPI uses xdp_md, not xdp_buff. Fix comments.
> > 
> > Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> > ---
> >   include/uapi/linux/bpf.h | 8 ++++----
> >   1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 0480f893facd..cc3553a102d0 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -1554,7 +1554,7 @@ union bpf_attr {  
> 
> Needs also tooling header copy, but once that is done, it needs fixup for libbpf:
> 
> [root@...9 bpf]# make
>    GEN      bpf_helper_defs.h
> Unrecognized type 'struct xdp_md', please add it to known types!
> make[1]: *** [Makefile:186: bpf_helper_defs.h] Error 1
> make[1]: *** Deleting file 'bpf_helper_defs.h'
> make: *** [Makefile:160: all] Error 2
> [root@...9 bpf]#
> 
> Pls fix up and send v2, thanks.

FWIW upon closer inspection it appears that this is intentional
(even if confusing) and bpf_helpers_doc.py swaps the types to 
__sk_buff and xdp_md when generating man pages and the header.

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