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Merge branch 'progarray_mapinmap_dump'

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Yonghong Song says:

====================
The support to dump program array and map_in_map maps
for bpffs and bpftool is added. Patch #1 added bpffs support
and Patch #2 added bpftool support. Please see
individual patches for example output.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2018-09-11 14:17:25 -07:00
commit 2e2a0c961a
2 changed files with 27 additions and 9 deletions
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25
kernel/bpf/arraymap.c
View File

@ -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,

11
tools/bpf/bpftool/map.c
View File

@ -673,12 +673,6 @@ static int do_dump(int argc, char **argv)
if (fd < 0)
return -1;
if (map_is_map_of_maps(info.type) || map_is_map_of_progs(info.type)) {
p_err("Dumping maps of maps and program maps not supported");
close(fd);
return -1;
}
key = malloc(info.key_size);
value = alloc_value(&info);
if (!key || !value) {
@ -732,7 +726,9 @@ static int do_dump(int argc, char **argv)
} else {
print_entry_plain(&info, key, value);
}
} else {
num_elems++;
} else if (!map_is_map_of_maps(info.type) &&
!map_is_map_of_progs(info.type)) {
if (json_output) {
jsonw_name(json_wtr, "key");
print_hex_data_json(key, info.key_size);
@ -749,7 +745,6 @@ static int do_dump(int argc, char **argv)
}
prev_key = key;
num_elems++;
}
if (json_output)