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authorYonghong Song <yhs@fb.com>2018-09-06 17:26:04 -0700
committerAlexei Starovoitov <ast@kernel.org>2018-09-11 14:17:24 -0700
commita7c19db38d62fc1ce797dba19936e9f81cf2b9fb (patch)
tree15272c1f537fde1b721005ab92b7d14875285024 /kernel
parentf6f3bac08ff9855d803081a353a1fafaa8845739 (diff)
downloadlinux-a7c19db38d62fc1ce797dba19936e9f81cf2b9fb.tar.bz2
bpf: add bpffs pretty print for program array map
Added bpffs pretty print for program array map. For a particular array index, if the program array points to a valid program, the "<index>: <prog_id>" will be printed out like 0: 6 which means bpf program with id "6" is installed at index "0". Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/arraymap.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index f9d24121be99..dded84cbe814 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -553,6 +553,29 @@ static void bpf_fd_array_map_clear(struct bpf_map *map)
fd_array_map_delete_elem(map, &i);
}
+static void prog_array_map_seq_show_elem(struct bpf_map *map, void *key,
+ struct seq_file *m)
+{
+ void **elem, *ptr;
+ u32 prog_id;
+
+ rcu_read_lock();
+
+ elem = array_map_lookup_elem(map, key);
+ if (elem) {
+ ptr = READ_ONCE(*elem);
+ if (ptr) {
+ seq_printf(m, "%u: ", *(u32 *)key);
+ prog_id = prog_fd_array_sys_lookup_elem(ptr);
+ btf_type_seq_show(map->btf, map->btf_value_type_id,
+ &prog_id, m);
+ seq_puts(m, "\n");
+ }
+ }
+
+ rcu_read_unlock();
+}
+
const struct bpf_map_ops prog_array_map_ops = {
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
@@ -564,7 +587,7 @@ const struct bpf_map_ops prog_array_map_ops = {
.map_fd_put_ptr = prog_fd_array_put_ptr,
.map_fd_sys_lookup_elem = prog_fd_array_sys_lookup_elem,
.map_release_uref = bpf_fd_array_map_clear,
- .map_check_btf = map_check_no_btf,
+ .map_seq_show_elem = prog_array_map_seq_show_elem,
};
static struct bpf_event_entry *bpf_event_entry_gen(struct file *perf_file,