[PATCH bpf-next v4 3/8] libbpf: Probe percpu data feature

Leon Hwang
2026-04-14T13:25:00Z

libbpf needs a reliable way to distinguish kernels that can support
global percpu data from those that cannot.

Add a dedicated feature probe, so libbpf can make capability decisions
early and fail predictably when global percpu data is unavailable.

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
---
tools/lib/bpf/features.c | 35 +++++++++++++++++++++++++++++++++
tools/lib/bpf/libbpf_internal.h | 2 ++
2 files changed, 37 insertions(+)

diff --git a/tools/lib/bpf/features.c b/tools/lib/bpf/features.c
index 4f19a0d79b0c..4ffdae42ffd7 100644
--- a/tools/lib/bpf/features.c
+++ b/tools/lib/bpf/features.c
@@ -615,6 +615,38 @@ static int probe_kern_btf_layout(int token_fd)
(char *)layout, token_fd));
}

+static int probe_kern_percpu_data(int token_fd)
+{
+ struct bpf_insn insns[] = {
+ BPF_LD_MAP_VALUE(BPF_REG_1, 0, 0),
+ BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, 0),
+ BPF_EXIT_INSN(),
+ };
+ LIBBPF_OPTS(bpf_map_create_opts, map_opts,
+ .token_fd = token_fd,
+ .map_flags = token_fd ? BPF_F_TOKEN_FD : 0,
+ );
+ LIBBPF_OPTS(bpf_prog_load_opts, prog_opts,
+ .token_fd = token_fd,
+ .prog_flags = token_fd ? BPF_F_TOKEN_FD : 0,
+ );
+ int ret, map, insn_cnt = ARRAY_SIZE(insns);
+
+ map = bpf_map_create(BPF_MAP_TYPE_PERCPU_ARRAY, "libbpf_percpu", sizeof(int), 8, 1,
+ &map_opts);
+ if (map < 0) {
+ pr_warn("Error in %s(): %s. Couldn't create simple percpu_array map.\n",
+ __func__, errstr(map));
+ return map;
+ }
+
+ insns[0].imm = map;
+
+ ret = bpf_prog_load(BPF_PROG_TYPE_SOCKET_FILTER, NULL, "GPL", insns, insn_cnt, &prog_opts);
+ close(map);
+ return probe_fd(ret);
+}
+
typedef int (*feature_probe_fn)(int /* token_fd */);

static struct kern_feature_cache feature_cache;
@@ -699,6 +731,9 @@ static struct kern_feature_desc {
[FEAT_BTF_LAYOUT] = {
"kernel supports BTF layout", probe_kern_btf_layout,
},
+ [FEAT_PERCPU_DATA] = {
+ "kernel supports percpu data", probe_kern_percpu_data,
+ },
};

bool feat_supported(struct kern_feature_cache *cache, enum kern_feature_id feat_id)
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
index 3781c45b46d3..f62da241a53f 100644
--- a/tools/lib/bpf/libbpf_internal.h
+++ b/tools/lib/bpf/libbpf_internal.h
@@ -398,6 +398,8 @@ enum kern_feature_id {
FEAT_UPROBE_SYSCALL,
/* Kernel supports BTF layout information */
FEAT_BTF_LAYOUT,
+ /* Kernel supports percpu data */
+ FEAT_PERCPU_DATA,
__FEAT_CNT,
};

--
2.53.0