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

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Date:   Wed, 18 Jul 2018 11:33:22 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     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 07/18/2018 10:42 AM, Daniel Borkmann wrote:
> On 07/18/2018 02:27 AM, 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
> 
> Yeah agree, I think it would be nice to see a more pahole style dump
> where we have types and member names along with the value as otherwise
> it might be a bit confusing.

Another feature that would be super useful imho would be in the /single/
map view e.g. 'bpftool map show id 123' to have a detailed BTF key+value
type dump, so in addition to the basic map info we show pahole like info
of the structs with length/offsets.

>> FWIW all the patches look nice to me!  Thanks for keeping the support
>> for loading programs from the ".text" section :)
> 
> The test_offload.py from BPF kselftests helped a lot in that! :)
> 
> Thanks,
> Daniel
>