// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2021 Facebook */ #include "vmlinux.h" #include <bpf/bpf_helpers.h> #define X_0(x) #define X_1(x) x X_0(x) #define X_2(x) x X_1(x) #define X_3(x) x X_2(x) #define X_4(x) x X_3(x) #define X_5(x) x X_4(x) #define X_6(x) x X_5(x) #define X_7(x) x X_6(x) #define X_8(x) x X_7(x) #define X_9(x) x X_8(x) #define X_10(x) x X_9(x) #define REPEAT_256(Y) X_2(X_10(X_10(Y))) X_5(X_10(Y)) X_6(Y) extern const int bpf_testmod_ksym_percpu __ksym; extern void bpf_testmod_test_mod_kfunc(int i) __ksym; extern void bpf_testmod_invalid_mod_kfunc(void) __ksym __weak; int out_bpf_testmod_ksym = 0; const volatile int x = 0; SEC("tc") int load(struct __sk_buff *skb) { /* This will be kept by clang, but removed by verifier. Since it is * marked as __weak, libbpf and gen_loader don't error out if BTF ID * is not found for it, instead imm and off is set to 0 for it. */ if (x) bpf_testmod_invalid_mod_kfunc(); bpf_testmod_test_mod_kfunc(42); out_bpf_testmod_ksym = *(int *)bpf_this_cpu_ptr(&bpf_testmod_ksym_percpu); return 0; } SEC("tc") int load_256(struct __sk_buff *skb) { /* this will fail if kfunc doesn't reuse its own btf fd index */ REPEAT_256(bpf_testmod_test_mod_kfunc(42);); bpf_testmod_test_mod_kfunc(42); return 0; } char LICENSE[] SEC("license") = "GPL";