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bpftool: Add support for querying cgroup_iter link

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Support dumping info of a cgroup_iter link. This includes
showing the cgroup's id and the order for walking the cgroup
hierarchy. Example output is as follows:

> bpftool link show
1: iter  prog 2  target_name bpf_map
2: iter  prog 3  target_name bpf_prog
3: iter  prog 12  target_name cgroup  cgroup_id 72  order self_only

> bpftool -p link show
[{
        "id": 1,
        "type": "iter",
        "prog_id": 2,
        "target_name": "bpf_map"
    },{
        "id": 2,
        "type": "iter",
        "prog_id": 3,
        "target_name": "bpf_prog"
    },{
        "id": 3,
        "type": "iter",
        "prog_id": 12,
        "target_name": "cgroup",
        "cgroup_id": 72,
        "order": "self_only"
    }
]

Signed-off-by: Hao Luo <haoluo@google.com>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220829231828.1016835-1-haoluo@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@linux.dev>
This commit is contained in:
Hao Luo 2022-08-29 16:18:28 -07:00 committed by Martin KaFai Lau
parent 2eb680401d
commit 6f95de6d71
1 changed files with 35 additions and 0 deletions
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35
tools/bpf/bpftool/link.c
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@ -83,6 +83,29 @@ static bool is_iter_map_target(const char *target_name)
strcmp(target_name, "bpf_sk_storage_map") == 0;
}
static bool is_iter_cgroup_target(const char *target_name)
{
return strcmp(target_name, "cgroup") == 0;
}
static const char *cgroup_order_string(__u32 order)
{
switch (order) {
case BPF_CGROUP_ITER_ORDER_UNSPEC:
return "order_unspec";
case BPF_CGROUP_ITER_SELF_ONLY:
return "self_only";
case BPF_CGROUP_ITER_DESCENDANTS_PRE:
return "descendants_pre";
case BPF_CGROUP_ITER_DESCENDANTS_POST:
return "descendants_post";
case BPF_CGROUP_ITER_ANCESTORS_UP:
return "ancestors_up";
default: /* won't happen */
return "unknown";
}
}
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);
@ -91,6 +114,12 @@ 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);
if (is_iter_cgroup_target(target_name)) {
jsonw_lluint_field(wtr, "cgroup_id", info->iter.cgroup.cgroup_id);
jsonw_string_field(wtr, "order",
cgroup_order_string(info->iter.cgroup.order));
}
}
static int get_prog_info(int prog_id, struct bpf_prog_info *info)
@ -208,6 +237,12 @@ 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);
if (is_iter_cgroup_target(target_name)) {
printf("cgroup_id %llu ", info->iter.cgroup.cgroup_id);
printf("order %s ",
cgroup_order_string(info->iter.cgroup.order));
}
}
static int show_link_close_plain(int fd, struct bpf_link_info *info)