netdev - Re: [PATCH bpf-next 2/2] tools/bpftool: show btf

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Date:   Wed, 17 Apr 2019 08:52:52 +0900
From:   Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
To:     Quentin Monnet <quentin.monnet@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        prashantbhole.linux@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next 2/2] tools/bpftool: show btf_id in map listing



On 4/16/2019 6:22 PM, Quentin Monnet wrote:
> 2019-04-16 17:59 UTC+0900 ~ Prashant Bhole 
> <bhole_prashant_q7@....ntt.co.jp>
>> Let's print btf id of map similar to the way we are printing it
>> for programs.
>>
>> Sample output:
>> user@...t# bpftool map -f
>> 61: lpm_trie  flags 0x1
>>     key 20B  value 8B  max_entries 1  memlock 4096B
>> 133: array  name test_btf_id  flags 0x0
>>     key 4B  value 4B  max_entries 4  memlock 4096B
>>     pinned /sys/fs/bpf/test100
>>     btf_id 174
>> 170: array  name test_btf_id  flags 0x0
>>     key 4B  value 4B  max_entries 4  memlock 4096B
>>     btf_id 240
>>
>> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
>> ---
>>   tools/bpf/bpftool/map.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
>> index cda0f27fa895..de3e4cb32d21 100644
>> --- a/tools/bpf/bpftool/map.c
>> +++ b/tools/bpf/bpftool/map.c
>> @@ -550,6 +550,9 @@ static int show_map_close_json(int fd, struct 
>> bpf_map_info *info)
>>           jsonw_end_array(json_wtr);
>>       }
>> +    if (info->btf_id)
>> +        jsonw_int_field(json_wtr, "btf_id", info->btf_id);
>> +
> 
> Just as a note, if you want to have things more consistent with prog.c, 
> you could print the btf_id _before_ the paths of pinned maps in JSON, 
> since this is what you did for programs.

Ok. I will send v2 with these changes soon. Thanks!

- Prashant


> 
>>       jsonw_end_object(json_wtr);
>>       return 0;
>> @@ -613,6 +616,9 @@ static int show_map_close_plain(int fd, struct 
>> bpf_map_info *info)
>>           }
>>       }
>> +    if (info->btf_id)
>> +        printf("\n\tbtf_id %d", info->btf_id);
>> +
>>       printf("\n");
>>       return 0;
>>   }
>>
> 
> Looks good to me, thank you!
> 
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
> 
>