From ad3338d2508cd7752accdd39881deced1ec2b8a1 Mon Sep 17 00:00:00 2001 From: Yonghong Song Date: Thu, 6 Sep 2018 17:26:05 -0700 Subject: [PATCH] tools/bpf: bpftool: support prog array map and map of maps Currently, prog array map and map of maps are not supported in bpftool. This patch added the support. Different from other map types, for prog array map and map of maps, the key returned bpf_get_next_key() may not point to a valid value. So for these two map types, no error will be printed out when such a scenario happens. The following is the plain and json dump if btf is not available: $ ./bpftool map dump id 10 key: 08 00 00 00 value: 5c 01 00 00 Found 1 element $ ./bpftool -jp map dump id 10 [{ "key": ["0x08","0x00","0x00","0x00" ], "value": ["0x5c","0x01","0x00","0x00" ] }] If the BTF is available, the dump looks below: $ ./bpftool map dump id 2 [{ "key": 0, "value": 7 } ] $ ./bpftool -jp map dump id 2 [{ "key": ["0x00","0x00","0x00","0x00" ], "value": ["0x07","0x00","0x00","0x00" ], "formatted": { "key": 0, "value": 7 } }] Signed-off-by: Yonghong Song Signed-off-by: Alexei Starovoitov --- tools/bpf/bpftool/map.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/tools/bpf/bpftool/map.c b/tools/bpf/bpftool/map.c index 9c55077..af8ad32 100644 --- a/tools/bpf/bpftool/map.c +++ b/tools/bpf/bpftool/map.c @@ -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) -- 2.7.4