selftests/bpf: add realistic loop tests

Add a bunch of loop tests. Most of them are created by replacing
'#pragma unroll' with '#pragma clang loop unroll(disable)'

Several tests are artificially large:
  /* partial unroll. llvm will unroll loop ~150 times.
   * C loop count -> 600.
   * Asm loop count -> 4.
   * 16k insns in loop body.
   * Total of 5 such loops. Total program size ~82k insns.
   */
  "./pyperf600.o",

  /* no unroll at all.
   * C loop count -> 600.
   * ASM loop count -> 600.
   * ~110 insns in loop body.
   * Total of 5 such loops. Total program size ~1500 insns.
   */
  "./pyperf600_nounroll.o",

  /* partial unroll. 19k insn in a loop.
   * Total program size 20.8k insn.
   * ~350k processed_insns
   */
  "./strobemeta.o",

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 56 insertions, 11 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
index c0091137074b..e1b55261526f 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_verif_scale.c
@@ -5,7 +5,7 @@ static int libbpf_debug_print(enum libbpf_print_level level,
 			      const char *format, va_list args)
 {
 	if (level != LIBBPF_DEBUG)
-		return 0;
+		return vfprintf(stderr, format, args);
 
 	if (!strstr(format, "verifier log"))
 		return 0;
@@ -32,24 +32,69 @@ static int check_load(const char *file, enum bpf_prog_type type)
 
 void test_bpf_verif_scale(void)
 {
-	const char *scale[] = {
-		"./test_verif_scale1.o", "./test_verif_scale2.o", "./test_verif_scale3.o"
+	const char *sched_cls[] = {
+		"./test_verif_scale1.o", "./test_verif_scale2.o", "./test_verif_scale3.o",
 	};
-	const char *pyperf[] = {
-		"./pyperf50.o",	"./pyperf100.o", "./pyperf180.o"
+	const char *raw_tp[] = {
+		/* full unroll by llvm */
+		"./pyperf50.o",	"./pyperf100.o", "./pyperf180.o",
+
+		/* partial unroll. llvm will unroll loop ~150 times.
+		 * C loop count -> 600.
+		 * Asm loop count -> 4.
+		 * 16k insns in loop body.
+		 * Total of 5 such loops. Total program size ~82k insns.
+		 */
+		"./pyperf600.o",
+
+		/* no unroll at all.
+		 * C loop count -> 600.
+		 * ASM loop count -> 600.
+		 * ~110 insns in loop body.
+		 * Total of 5 such loops. Total program size ~1500 insns.
+		 */
+		"./pyperf600_nounroll.o",
+
+		"./loop1.o", "./loop2.o",
+
+		/* partial unroll. 19k insn in a loop.
+		 * Total program size 20.8k insn.
+		 * ~350k processed_insns
+		 */
+		"./strobemeta.o",
+
+		/* no unroll, tiny loops */
+		"./strobemeta_nounroll1.o",
+		"./strobemeta_nounroll2.o",
+	};
+	const char *cg_sysctl[] = {
+		"./test_sysctl_loop1.o", "./test_sysctl_loop2.o",
 	};
 	int err, i;
 
 	if (verifier_stats)
 		libbpf_set_print(libbpf_debug_print);
 
-	for (i = 0; i < ARRAY_SIZE(scale); i++) {
-		err = check_load(scale[i], BPF_PROG_TYPE_SCHED_CLS);
-		printf("test_scale:%s:%s\n", scale[i], err ? "FAIL" : "OK");
+	err = check_load("./loop3.o", BPF_PROG_TYPE_RAW_TRACEPOINT);
+	printf("test_scale:loop3:%s\n", err ? (error_cnt--, "OK") : "FAIL");
+
+	for (i = 0; i < ARRAY_SIZE(sched_cls); i++) {
+		err = check_load(sched_cls[i], BPF_PROG_TYPE_SCHED_CLS);
+		printf("test_scale:%s:%s\n", sched_cls[i], err ? "FAIL" : "OK");
 	}
 
-	for (i = 0; i < ARRAY_SIZE(pyperf); i++) {
-		err = check_load(pyperf[i], BPF_PROG_TYPE_RAW_TRACEPOINT);
-		printf("test_scale:%s:%s\n", pyperf[i], err ? "FAIL" : "OK");
+	for (i = 0; i < ARRAY_SIZE(raw_tp); i++) {
+		err = check_load(raw_tp[i], BPF_PROG_TYPE_RAW_TRACEPOINT);
+		printf("test_scale:%s:%s\n", raw_tp[i], err ? "FAIL" : "OK");
 	}
+
+	for (i = 0; i < ARRAY_SIZE(cg_sysctl); i++) {
+		err = check_load(cg_sysctl[i], BPF_PROG_TYPE_CGROUP_SYSCTL);
+		printf("test_scale:%s:%s\n", cg_sysctl[i], err ? "FAIL" : "OK");
+	}
+	err = check_load("./test_xdp_loop.o", BPF_PROG_TYPE_XDP);
+	printf("test_scale:test_xdp_loop:%s\n", err ? "FAIL" : "OK");
+
+	err = check_load("./test_seg6_loop.o", BPF_PROG_TYPE_LWT_SEG6LOCAL);
+	printf("test_scale:test_seg6_loop:%s\n", err ? "FAIL" : "OK");
 }