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[bpf-next,v3,0/3] bpf: implement link_query for bpf iterators

Message ID 20200821153546.4056166-1-yhs@fb.com
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Series bpf: implement link_query for bpf iterators | expand

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Yonghong Song Aug. 21, 2020, 3:35 p.m. UTC 
"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:
  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(-)