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| author | Kui-Feng Lee <kuifeng@fb.com> | 2022-09-26 20:49:57 +0200 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-09-29 01:30:08 +0200 |
| commit | 6bdb6d6be019f697296f52c37865dd7b0ce80750 (patch) | |
| tree | d89a236e696c709e1798ced9fe215c7d6d74befb /tools/bpf/bpftool/link.c | |
| parent | selftests/bpf: Test parameterized task BPF iterators. (diff) | |
| download | linux-6bdb6d6be019f697296f52c37865dd7b0ce80750.tar.xz linux-6bdb6d6be019f697296f52c37865dd7b0ce80750.zip | |
bpftool: Show parameters of BPF task iterators.
Show tid or pid of iterators if giving an argument of tid or pid
For example, the command `bpftool link list` may list following
lines.
1: iter prog 2 target_name bpf_map
2: iter prog 3 target_name bpf_prog
33: iter prog 225 target_name task_file tid 1644
pids test_progs(1644)
Link 33 is a task_file iterator with tid 1644. For now, only targets
of task, task_file and task_vma may be with tid or pid to filter out
tasks other than those belonging to a process (pid) or a thread (tid).
Signed-off-by: Kui-Feng Lee <kuifeng@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/bpf/20220926184957.208194-6-kuifeng@fb.com
Diffstat (limited to 'tools/bpf/bpftool/link.c')
| -rw-r--r-- | tools/bpf/bpftool/link.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/link.c b/tools/bpf/bpftool/link.c index ef0dc2f8d5a2..2863639706dd 100644 --- a/tools/bpf/bpftool/link.c +++ b/tools/bpf/bpftool/link.c @@ -106,6 +106,13 @@ static const char *cgroup_order_string(__u32 order) } } +static bool is_iter_task_target(const char *target_name) +{ + return strcmp(target_name, "task") == 0 || + strcmp(target_name, "task_file") == 0 || + strcmp(target_name, "task_vma") == 0; +} + static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr) { const char *target_name = u64_to_ptr(info->iter.target_name); @@ -114,6 +121,12 @@ static void show_iter_json(struct bpf_link_info *info, json_writer_t *wtr) if (is_iter_map_target(target_name)) jsonw_uint_field(wtr, "map_id", info->iter.map.map_id); + else if (is_iter_task_target(target_name)) { + if (info->iter.task.tid) + jsonw_uint_field(wtr, "tid", info->iter.task.tid); + else if (info->iter.task.pid) + jsonw_uint_field(wtr, "pid", info->iter.task.pid); + } if (is_iter_cgroup_target(target_name)) { jsonw_lluint_field(wtr, "cgroup_id", info->iter.cgroup.cgroup_id); @@ -237,6 +250,12 @@ static void show_iter_plain(struct bpf_link_info *info) if (is_iter_map_target(target_name)) printf("map_id %u ", info->iter.map.map_id); + else if (is_iter_task_target(target_name)) { + if (info->iter.task.tid) + printf("tid %u ", info->iter.task.tid); + else if (info->iter.task.pid) + printf("pid %u ", info->iter.task.pid); + } if (is_iter_cgroup_target(target_name)) { printf("cgroup_id %llu ", info->iter.cgroup.cgroup_id); |