Yonghong Song 6b0a249a30
bpf: Implement link_query for bpf iterators ...
This patch implemented bpf_link callback functions
show_fdinfo and fill_link_info to support link_query
interface.
The general interface for show_fdinfo and fill_link_info
will print/fill the target_name. Each targets can
register show_fdinfo and fill_link_info callbacks
to print/fill more target specific information.
For example, the below is a fdinfo result for a bpf
task iterator.
$ cat /proc/1749/fdinfo/7
pos: 0
flags: 02000000
mnt_id: 14
link_type: iter
link_id: 11
prog_tag: 990e1f8152f7e54f
prog_id: 59
target_name: task
Signed-off-by: Yonghong Song <yhs@fb.com >
Signed-off-by: Alexei Starovoitov <ast@kernel.org >
Link: https://lore.kernel.org/bpf/20200821184418.574122-1-yhs@fb.com
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Yonghong Song
6b0a249a30