netdev - Re: [PATCH bpf-next v3 2/3] libbpf: add bpf_object__load_xattr() API function to pass log

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Date:   Wed, 29 May 2019 10:18:01 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        oss-drivers@...ronome.com, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH bpf-next v3 2/3] libbpf: add bpf_object__load_xattr() API
 function to pass log_level

2019-05-28 17:35 UTC-0700 ~ Alexei Starovoitov
<alexei.starovoitov@...il.com>
> On Fri, May 24, 2019 at 3:36 AM Quentin Monnet
> <quentin.monnet@...ronome.com> wrote:
>>
>> libbpf was recently made aware of the log_level attribute for programs,
>> used to specify the level of information expected to be dumped by the
>> verifier. Function bpf_prog_load_xattr() got support for this log_level
>> parameter.
>>
>> But some applications using libbpf rely on another function to load
>> programs, bpf_object__load(), which does accept any parameter for log
>> level. Create an API function based on bpf_object__load(), but accepting
>> an "attr" object as a parameter. Then add a log_level field to that
>> object, so that applications calling the new bpf_object__load_xattr()
>> can pick the desired log level.
>>
>> v3:
>> - Rewrite commit log.
>>
>> v2:
>> - We are in a new cycle, bump libbpf extraversion number.
>>
>> Signed-off-by: Quentin Monnet <quentin.monnet@...ronome.com>
>> Reviewed-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>> ---
>>  tools/lib/bpf/Makefile   |  2 +-
>>  tools/lib/bpf/libbpf.c   | 20 +++++++++++++++++---
>>  tools/lib/bpf/libbpf.h   |  6 ++++++
>>  tools/lib/bpf/libbpf.map |  5 +++++
>>  4 files changed, 29 insertions(+), 4 deletions(-)
> 
> This commit broke ./test_progs -s
> prog_tests/bpf_verif_scale.c no longer passes log_level.
> Could you please take a look?
> 

Indeed, I forgot that bpf_load_prog_xattr() would eventually call
bpf_object__load_progs() as well, where the log_level is now overwritten.

Fix incoming, sorry about that.

Quentin