linux-kernel - Re: [PATCH v7 perf,bpf 02/15] bpf: libbpf: introduce bpf_program__get_prog_info

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Date:   Mon, 11 Mar 2019 17:57:20 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Song Liu <songliubraving@...com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        ast@...nel.org, kernel-team@...com, peterz@...radead.org,
        acme@...hat.com, jolsa@...nel.org, namhyung@...nel.org
Subject: Re: [PATCH v7 perf,bpf 02/15] bpf: libbpf: introduce
 bpf_program__get_prog_info_linear()

Em Mon, Mar 11, 2019 at 09:45:49PM +0100, Daniel Borkmann escreveu:
> On 03/11/2019 07:26 PM, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Mar 07, 2019 at 09:57:57AM -0800, Song Liu escreveu:
> >> Currently, bpf_prog_info includes 9 arrays. The user has the option to
> >> fetch any combination of these arrays. However, this requires a lot of
> >> handling of these arrays. This work becomes more tricky when we need to
> >> store bpf_prog_info to a file, because these arrays are allocated
> >> independently.
> >>
> >> This patch introduces struct bpf_prog_info_linear, which stores arrays
> >> of bpf_prog_info in continues memory. Helper functions are introduced
> >> to unify the work to get different information of bpf_prog_info.
> >> Specifically, bpf_program__get_prog_info_linear() allows the user to
> >> select which arrays to fetch, and handles details for the user.
> >>
> >> Plesae see the comments before enum bpf_prog_info_array for more details
> >> and examples.
> >>
> >> Cc: Daniel Borkmann <daniel@...earbox.net>
> >> Cc: Alexei Starovoitov <ast@...nel.org>
> > 
> > Daniel, are you ok with these changes to libbpf and bpftool? Perhaps
> > those should be detached from this patchkit and submitted sooner,
> > eroding the size of this kit.
> > 
> > Alternatively, if you're ok with it, please provide your Acked-by and
> > I'll process as soon as I get back to it after Jiri is done reviewing.
> 
> Overall looks okay. Are you planning to get these in for 5.1 window? If

I hope so.

> yes, that would be great, otherwise we might need to cherry-pick the libbpf

So I'll try and grab those for my next pull req to Ingo, this week,
will add your Acked-by, ok?

> and bpftool ones from your tree into bpf-next as well since there's just
> too much going on in this area where we'd potentially run into complex
> merge conflicts. In the latter case, libbpf.map would need to be fixed up
> to LIBBPF_0.0.3 as convention is that this is in line with kernel release.

BTW, while running my build tests I had to add this to today's batch,
should be trivial when merging, I think, ok?


commit dfcbc2f2994b8a3af3605a26dc29c07ad7378bf4
Author: Arnaldo Carvalho de Melo <acme@...hat.com>
Date:   Mon Mar 11 17:07:52 2019 -0300

    tools lib bpf: Fix the build by adding a missing stdarg.h include
    
    The libbpf_print_fn_t typedef uses va_list without including the header
    where that type is defined, stdarg.h, breaking in places where we're
    unlucky for that type not to be already defined by some previously
    included header.
    
    Noticed while building on fedora 24 cross building tools/perf to the ARC
    architecture using the uClibc C library:
    
      28 fedora:24-x-ARC-uClibc   : FAIL arc-linux-gcc (ARCompact ISA Linux uClibc toolchain 2017.09-rc2) 7.1.1 20170710
    
        CC       /tmp/build/perf/tests/llvm.o
      In file included from tests/llvm.c:3:0:
      /git/linux/tools/lib/bpf/libbpf.h:57:20: error: unknown type name 'va_list'
            const char *, va_list ap);
                          ^~~~~~~
      /git/linux/tools/lib/bpf/libbpf.h:59:34: error: unknown type name 'libbpf_print_fn_t'
       LIBBPF_API void libbpf_set_print(libbpf_print_fn_t fn);
                                        ^~~~~~~~~~~~~~~~~
      mv: cannot stat '/tmp/build/perf/tests/.llvm.o.tmp': No such file or directory
    
    Cc: Alexei Starovoitov <ast@...nel.org>
    Cc: Daniel Borkmann <daniel@...earbox.net>
    Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
    Cc: Jiri Olsa <jolsa@...nel.org>
    Cc: Namhyung Kim <namhyung@...nel.org>
    Cc: Quentin Monnet <quentin.monnet@...ronome.com>
    Cc: Stanislav Fomichev <sdf@...gle.com>
    Cc: Yonghong Song <yhs@...com>
    Fixes: a8a1f7d09cfc ("libbpf: fix libbpf_print")
    Link: https://lkml.kernel.org/n/tip-5270n2quu2gqz22o7itfdx00@git.kernel.org
    Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index b4652aa1a58a..aa1521a51687 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -10,6 +10,7 @@
 #ifndef __LIBBPF_LIBBPF_H
 #define __LIBBPF_LIBBPF_H
 
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdbool.h>