On Fri, Aug 21, 2020 at 11:44 AM Yonghong Song <yhs@xxxxxx> 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@xxxxxx>
