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Add support to dump tcx link information to bpftool. This adds a
common helper show_link_ifindex_{plain,json}() which can be reused
also for other link types. The plain text and json device output is
the same format as in bpftool net dump.
Below shows an example link dump output along with a cgroup link
for comparison:
# bpftool link
[...]
10: cgroup prog 1977
cgroup_id 1 attach_type cgroup_inet6_post_bind
[...]
13: tcx prog 2053
ifindex enp5s0(3) attach_type tcx_ingress
14: tcx prog 2080
ifindex enp5s0(3) attach_type tcx_egress
[...]
Equivalent json output:
# bpftool link --json
[...]
{
"id": 10,
"type": "cgroup",
"prog_id": 1977,
"cgroup_id": 1,
"attach_type": "cgroup_inet6_post_bind"
},
[...]
{
"id": 13,
"type": "tcx",
"prog_id": 2053,
"devname": "enp5s0",
"ifindex": 3,
"attach_type": "tcx_ingress"
},
{
"id": 14,
"type": "tcx",
"prog_id": 2080,
"devname": "enp5s0",
"ifindex": 3,
"attach_type": "tcx_egress"
}
[...]
Suggested-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230816095651.10014-1-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
e16e6c6df4