From: Alexei Starovoitov <ast@xxxxxxxxxx>
__uint() macro that is used to specify map attributes like:
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(map_flags, BPF_F_MMAPABLE);
is limited to 32-bit, since BTF_KIND_ARRAY has u32 "number of elements" field.
Introduce __ulong() macro that allows specifying values bigger than 32-bit.
In map definition "map_extra" is the only u64 field.
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
---
tools/lib/bpf/bpf_helpers.h | 1 +
tools/lib/bpf/libbpf.c | 44 ++++++++++++++++++++++++++++++++++---
2 files changed, 42 insertions(+), 3 deletions(-)
diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index 9c777c21da28..fb909fc6866d 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -13,6 +13,7 @@
#define __uint(name, val) int (*name)[val]
#define __type(name, val) typeof(val) *name
#define __array(name, val) typeof(val) *name[]
+#define __ulong(name, val) enum name##__enum { name##__value = val } name
/*
* Helper macro to place programs, maps, license in
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index c5ce5946dc6d..a8c89b2315cd 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -2229,6 +2229,39 @@ static bool get_map_field_int(const char *map_name, const struct btf *btf,
return true;
}
+static bool get_map_field_long(const char *map_name, const struct btf *btf,
+ const struct btf_member *m, __u64 *res)
+{
+ const struct btf_type *t = skip_mods_and_typedefs(btf, m->type, NULL);
+ const char *name = btf__name_by_offset(btf, m->name_off);
+
+ if (btf_is_ptr(t))
+ return false;
+
+ if (!btf_is_enum(t) && !btf_is_enum64(t)) {
+ pr_warn("map '%s': attr '%s': expected enum or enum64, got %s.\n",
+ map_name, name, btf_kind_str(t));
+ return false;
+ }
+
+ if (btf_vlen(t) != 1) {
+ pr_warn("map '%s': attr '%s': invalid __ulong\n",
+ map_name, name);
+ return false;
+ }
+
+ if (btf_is_enum(t)) {
+ const struct btf_enum *e = btf_enum(t);
+
+ *res = e->val;
+ } else {
+ const struct btf_enum64 *e = btf_enum64(t);
+
+ *res = btf_enum64_value(e);
+ }
+ return true;
+}
+
static int pathname_concat(char *buf, size_t buf_sz, const char *path, const char *name)
{
int len;
@@ -2462,10 +2495,15 @@ int parse_btf_map_def(const char *map_name, struct btf *btf,
map_def->pinning = val;
map_def->parts |= MAP_DEF_PINNING;
} else if (strcmp(name, "map_extra") == 0) {
- __u32 map_extra;
+ __u64 map_extra;
- if (!get_map_field_int(map_name, btf, m, &map_extra))
- return -EINVAL;
+ if (!get_map_field_long(map_name, btf, m, &map_extra)) {
+ __u32 map_extra_u32;
+
+ if (!get_map_field_int(map_name, btf, m, &map_extra_u32))
+ return -EINVAL;
+ map_extra = map_extra_u32;
+ }
map_def->map_extra = map_extra;
map_def->parts |= MAP_DEF_MAP_EXTRA;
} else {
--
2.34.1
