diff options
Diffstat (limited to 'Documentation/bpf/btf.rst')
| -rw-r--r-- | Documentation/bpf/btf.rst | 32 |
1 files changed, 14 insertions, 18 deletions
diff --git a/Documentation/bpf/btf.rst b/Documentation/bpf/btf.rst index 1ebf4c5c7ddc..ab08852e53ae 100644 --- a/Documentation/bpf/btf.rst +++ b/Documentation/bpf/btf.rst @@ -565,18 +565,15 @@ A map can be created with ``btf_fd`` and specified key/value type id.:: In libbpf, the map can be defined with extra annotation like below: :: - struct bpf_map_def SEC("maps") btf_map = { - .type = BPF_MAP_TYPE_ARRAY, - .key_size = sizeof(int), - .value_size = sizeof(struct ipv_counts), - .max_entries = 4, - }; - BPF_ANNOTATE_KV_PAIR(btf_map, int, struct ipv_counts); + struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, int); + __type(value, struct ipv_counts); + __uint(max_entries, 4); + } btf_map SEC(".maps"); -Here, the parameters for macro BPF_ANNOTATE_KV_PAIR are map name, key and -value types for the map. During ELF parsing, libbpf is able to extract -key/value type_id's and assign them to BPF_MAP_CREATE attributes -automatically. +During ELF parsing, libbpf is able to extract key/value type_id's and assign +them to BPF_MAP_CREATE attributes automatically. .. _BPF_Prog_Load: @@ -824,13 +821,12 @@ structure has bitfields. For example, for the following map,:: ___A b1:4; enum A b2:4; }; - struct bpf_map_def SEC("maps") tmpmap = { - .type = BPF_MAP_TYPE_ARRAY, - .key_size = sizeof(__u32), - .value_size = sizeof(struct tmp_t), - .max_entries = 1, - }; - BPF_ANNOTATE_KV_PAIR(tmpmap, int, struct tmp_t); + struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, int); + __type(value, struct tmp_t); + __uint(max_entries, 1); + } tmpmap SEC(".maps"); bpftool is able to pretty print like below: :: |