netdev - Re: [PATCH v4 bpf-next 0/4] tools/btf: extend libbpf APIs to work with btf w/o kernel

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Date:   Fri, 8 Feb 2019 12:08:26 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     andrii.nakryiko@...il.com, songliubraving@...com, yhs@...com,
        ast@...com, kafai@...com, netdev@...r.kernel.org,
        kernel-team@...com, daniel@...earbox.net, acme@...nel.org
Subject: Re: [PATCH v4 bpf-next 0/4] tools/btf: extend libbpf APIs to work
 with btf w/o kernel

On Fri, Feb 08, 2019 at 11:19:35AM -0800, Andrii Nakryiko wrote:
> This patchset introduces a set of new APIs that make it possible to work with BTF
> more effectively (and without involving kernel) for applications like pahole that
> need to manipulate .BTF and .BTF.ext data.
> 
> Patch #1 changes existing btf__new() API call to only load and initialize
> struct btf, while exposing new btf__load() API to attempt to load and validate
> BTF in kernel.
> 
> Patch #2 adds btf__get_raw_data() API allowing to get access to raw BTF data from
> struct btf.
> 
> Patch #3 adds similar btf_ext__get_raw_data() API for working with struct btf_ext.
> 
> Patch #4 removes not-yet-stable btf__get_strings() API which was added to be able
> to test contents of struct btf for btf__dedup(). It's now superseded by raw APIs.
> 
> v3->v4:
> - formatting fixes
> - renamed btf_ext functions/structs to use "setup" language instead of "copy"
> - removed btf__get_strings from libbpf.map
> 
> v2->v3:
> - const void* variants of btf__get_raw_data()
> - added btf_ext__get_raw_data()
> - removed btf__get_strings() and adapted test_btf.c to use btf__get_raw_data()
> 
> v1->v2:
> - btf_load() returns just error, not fd
> - fix ordering in libbpf.map

Applied, Thanks