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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 <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song 2018-09-06 17:26:05 -07:00 committed by Alexei Starovoitov
parent a7c19db38d
commit ad3338d250
1 changed files with 3 additions and 8 deletions
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11
tools/bpf/bpftool/map.c
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@ -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)