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Date:   Fri, 21 Aug 2020 08:35:46 -0700
From:   Yonghong Song <>
To:     <>, <>
CC:     Alexei Starovoitov <>,
        Daniel Borkmann <>, <>
Subject: [PATCH bpf-next v3 0/3] bpf: implement link_query for bpf iterators

"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
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.

  v2 -> v3:
    . remove extra '\t' when fdinfo prints map_id to make parsing
      consistent. (Andrii)
  v1 -> v2:
    . fix 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(-)


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