netdev - Re: [PATCH iproute2 5/5] bpf: implement btf handling and map annotation

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Date:   Wed, 18 Jul 2018 16:52:34 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     Daniel Borkmann <daniel@...earbox.net>, <dsahern@...il.com>,
        <alexei.starovoitov@...il.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2 5/5] bpf: implement btf handling and map
 annotation

On Tue, Jul 17, 2018 at 05:27:43PM -0700, Jakub Kicinski wrote:
> On Wed, 18 Jul 2018 01:31:22 +0200, Daniel Borkmann wrote:
> >   # bpftool map dump id 386
> >    [{
> >         "key": 0,
> >         "value": {
> >             "": {
> >                 "value": 0,
> >                 "ifindex": 0,
> >                 "mac": []
> >             }
> >         }
> >     },{
> >         "key": 1,
> >         "value": {
> >             "": {
> >                 "value": 0,
> >                 "ifindex": 0,
> >                 "mac": []
> >             }
> >         }
> >     },{
> >   [...]
> 
> Ugh, the empty keys ("") look worrying, we should probably improve
> handling of anonymous structs in bpftool :S
Note that the kernel's btf_verifier_log is using "(anon)" in this case.
Not sure if it is a good idea for json.