[bpf-next,v4,4/8] bpf: arm64: No support of struct argument in trampoline programs

Commit Message

Yonghong Song Aug. 31, 2022, 3:27 p.m. UTC

ARM64 does not support struct argument for trampoline based
bpf programs yet.

Signed-off-by: Yonghong Song <[e-mail]>
---
 arch/arm64/net/bpf_jit_comp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 389623ae5a91..30f76178608b 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -1970,7 +1970,7 @@  int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image,
 				u32 flags, struct bpf_tramp_links *tlinks,
 				void *orig_call)
 {
-	int ret;
+	int i, ret;
 	int nargs = m->nr_args;
 	int max_insns = ((long)image_end - (long)image) / AARCH64_INSN_SIZE;
 	struct jit_ctx ctx = {
@@ -1982,6 +1982,12 @@  int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *image,
 	if (nargs > 8)
 		return -ENOTSUPP;
 
+	/* don't support struct argument */
+	for (i = 0; i < MAX_BPF_FUNC_ARGS; i++) {
+		if (m->arg_flags[i] & BTF_FMODEL_STRUCT_ARG)
+			return -ENOTSUPP;
+	}
+
 	ret = prepare_trampoline(&ctx, im, tlinks, orig_call, nargs, flags);
 	if (ret < 0)
 		return ret;