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tools/bpf: bpftool: add btf percpu map formated dump
The btf pretty print is added to percpu arraymap, percpu hashmap and percpu lru hashmap. For each <key, value> pair, the following will be added to plain/json output: { "key": <pretty_print_key>, "values": [{ "cpu": 0, "value": <pretty_print_value_on_cpu0> },{ "cpu": 1, "value": <pretty_print_value_on_cpu1> },{ .... },{ "cpu": n, "value": <pretty_print_value_on_cpun> } ] } For example, the following could be part of plain or json formatted output: { "key": 0, "values": [{ "cpu": 0, "value": { "ui32": 0, "ui16": 0, } },{ "cpu": 1, "value": { "ui32": 1, "ui16": 0, } },{ "cpu": 2, "value": { "ui32": 2, "ui16": 0, } },{ "cpu": 3, "value": { "ui32": 3, "ui16": 0, } } ] } Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -169,9 +169,28 @@ static int do_dump_btf(const struct btf_dumper *d,
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if (ret)
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goto err_end_obj;
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jsonw_name(d->jw, "value");
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if (!map_is_per_cpu(map_info->type)) {
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jsonw_name(d->jw, "value");
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ret = btf_dumper_type(d, map_info->btf_value_type_id, value);
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} else {
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unsigned int i, n, step;
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ret = btf_dumper_type(d, map_info->btf_value_type_id, value);
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jsonw_name(d->jw, "values");
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jsonw_start_array(d->jw);
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n = get_possible_cpus();
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step = round_up(map_info->value_size, 8);
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for (i = 0; i < n; i++) {
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jsonw_start_object(d->jw);
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jsonw_int_field(d->jw, "cpu", i);
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jsonw_name(d->jw, "value");
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ret = btf_dumper_type(d, map_info->btf_value_type_id,
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value + i * step);
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jsonw_end_object(d->jw);
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if (ret)
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break;
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}
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jsonw_end_array(d->jw);
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}
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err_end_obj:
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/* end of key-value pair */
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@ -298,6 +317,16 @@ static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
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jsonw_end_object(json_wtr);
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}
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jsonw_end_array(json_wtr);
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if (btf) {
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struct btf_dumper d = {
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.btf = btf,
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.jw = json_wtr,
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.is_plain_text = false,
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};
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jsonw_name(json_wtr, "formatted");
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do_dump_btf(&d, info, key, value);
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}
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}
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jsonw_end_object(json_wtr);
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