bpftool: Fix print error when show bpf map

If there is no btf_id or frozen, it will not show the pids, but the pids don't
depend on any one of them.

Below is the result after this change:

  $ ./bpftool map show
  2: lpm_trie  flags 0x1
	key 8B  value 8B  max_entries 1  memlock 4096B
	pids systemd(1)
  3: lpm_trie  flags 0x1
	key 20B  value 8B  max_entries 1  memlock 4096B
	pids systemd(1)

While before this change, the 'pids systemd(1)' can't be displayed.

Fixes: 9330986c0300 ("bpf: Add bloom filter map implementation")
Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220320060815.7716-1-laoar.shao@gmail.com

diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c
index f91d9bf..c26378f 100644 (file)
--- a/tools/bpf/bpftool/map.c
+++ b/tools/bpf/bpftool/map.c
@@ -620,17 +620,14 @@ static int show_map_close_plain(int fd, struct bpf_map_info *info)
                                            u32_as_hash_field(info->id))
                        printf("\n\tpinned %s", (char *)entry->value);
        }
-       printf("\n");
 
        if (frozen_str) {
                frozen = atoi(frozen_str);
                free(frozen_str);
        }
 
-       if (!info->btf_id && !frozen)
-               return 0;
-
-       printf("\t");
+       if (info->btf_id || frozen)
+               printf("\n\t");
 
        if (info->btf_id)
                printf("btf_id %d", info->btf_id);