netdev - Re: [PATCH bpf-next v6 00/16] BPF support for global data

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Date:   Tue, 9 Apr 2019 17:10:33 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Joe Stringer <joe@...d.net.nz>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Martin KaFai Lau <kafai@...com>, Jann Horn <jannh@...gle.com>
Subject: Re: [PATCH bpf-next v6 00/16] BPF support for global data

On Tue, Apr 9, 2019 at 2:09 PM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> This series is a major rework of previously submitted libbpf
> patches [0] in order to add global data support for BPF. The
> kernel has been extended to add proper infrastructure that allows
> for full .bss/.data/.rodata sections on BPF loader side based
> upon feedback from LPC discussions [1]. Latter support is then
> also added into libbpf in this series which allows for more
> natural C-like programming of BPF programs. For more information
> on loader, please refer to 'bpf, libbpf: support global data/bss/
> rodata sections' patch in this series.
>
> Thanks a lot!
>
>   v5 -> v6:
>    - Removed synchronize_rcu() from map freeze (Jann)
>    - Rest as-is
>   v4 -> v5:
>    - Removed index selection again for ldimm64 (Alexei)
>    - Adapted related test cases and added new ones to test
>      rejection of off != 0
>   v3 -> v4:
>    - Various fixes in BTF verification e.g. to disallow
>      Var and DataSec to be an intermediate type during resolve (Martin)
>    - More BTF test cases added
>    - Few cleanups in key-less BTF commit (Martin)
>    - Bump libbpf minor version from 2 to 3
>    - Renamed and simplified read-only locking
>    - Various minor improvements all over the place
>   v2 -> v3:
>    - Implement BTF support in kernel, libbpf, bpftool, add tests
>    - Fix idx + off conversion (Andrii)
>    - Document lower / higher bits for direct value access (Andrii)
>    - Add tests with small value size (Andrii)
>    - Add index selection into ldimm64 (Andrii)
>    - Fix missing fdput() (Jann)
>    - Reject invalid flags in BPF_F_*_PROG (Jakub)
>    - Complete rework of libbpf support, includes:
>     - Add objname to map name (Stanislav)
>     - Make .rodata map full read-only after setup (Andrii)
>     - Merge relocation handling into single one (Andrii)
>     - Store global maps into obj->maps array (Andrii, Alexei)
>     - Debug message when skipping section (Andrii)
>     - Reject non-static global data till we have
>       semantics for sharing them (Yonghong, Andrii, Alexei)
>     - More test cases and completely reworked prog test (Alexei)
>    - Fixes, cleanups, etc all over the set
>    - Not yet addressed:
>     - Make BTF mandatory for these maps (Alexei)
>     -> Waiting till BTF support for these lands first
>   v1 -> v2:
>     - Instead of 32-bit static data, implement full global
>       data support (Alexei)
>
>   [0] https://patchwork.ozlabs.org/cover/1040290/
>   [1] http://vger.kernel.org/lpc-bpf2018.html#session-3

Applied to bpf-next. Thanks!