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Date:   Fri, 21 Aug 2020 14:17:16 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Yonghong Song <yhs@...com>, bpf <bpf@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf-next v4 0/3] bpf: implement link_query for bpf iterators

On Fri, Aug 21, 2020 at 12:04 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Fri, Aug 21, 2020 at 11:44 AM Yonghong Song <yhs@...com> wrote:
> >
> > "link" has been an important concept for bpf ecosystem to connect
> > bpf program with other properties. Currently, the information related
> > information can be queried from userspace through bpf command
> > BPF_LINK_GET_NEXT_ID, BPF_LINK_GET_FD_BY_ID and BPF_OBJ_GET_INFO_BY_FD.
> > The information is also available by "cating" /proc/<pid>/fdinfo/<link_fd>.
> > Raw_tracepoint, tracing, cgroup, netns and xdp links are already
> > supported in the kernel and bpftool.
> >
> > This patch added support for bpf iterator. Patch #1 added generic support
> > for link querying interface. Patch #2 implemented callback functions
> > for map element bpf iterators. Patch #3 added bpftool support.
> >
> > Changelogs:
> >   v3 -> v4:
> >     . return target specific link_info even if target_name buffer
> >       is empty. (Andrii)
> >   v2 -> v3:
> >     . remove extra '\t' when fdinfo prints map_id to make parsing
> >       consistent. (Andrii)
> >   v1 -> v2:
> >     . fix checkpatch.pl warnings. (Jakub)
> >
> > Yonghong Song (3):
> >   bpf: implement link_query for bpf iterators
> >   bpf: implement link_query callbacks in map element iterators
> >   bpftool: implement link_query for bpf iterators
> >
> >  include/linux/bpf.h            | 10 ++++++
> >  include/uapi/linux/bpf.h       |  7 ++++
> >  kernel/bpf/bpf_iter.c          | 58 ++++++++++++++++++++++++++++++++++
> >  kernel/bpf/map_iter.c          | 15 +++++++++
> >  net/core/bpf_sk_storage.c      |  2 ++
> >  tools/bpf/bpftool/link.c       | 44 ++++++++++++++++++++++++--
> >  tools/include/uapi/linux/bpf.h |  7 ++++
> >  7 files changed, 140 insertions(+), 3 deletions(-)
> >
> > --
> > 2.24.1
> >
>
> LGTM, thanks.
>
> Acked-by: Andrii Nakryiko <andriin@...com>

Applied. Thanks

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