[PATCH v2] selftests/bpf: avoid jump seq limit in verif_scale_pyperf600

[Sun Jian <sun.jian.kdev@gmail.com>]

pyperf600 is a verifier scale test. With newer LLVM, calling __on_event()
twice can push the generated program over the verifier jump sequence
complexity limit (8192), failing with:

  The sequence of 8193 jumps is too complex.

Let pyperf600 provide its own on_event() that calls __on_event() once, and
guard the shared wrapper accordingly. Other pyperf600 variants are
unaffected.

Signed-off-by: Sun Jian <sun.jian.kdev@gmail.com>
---

v2:
  - Drop runtime -E2BIG skip; instead tweak pyperf600 program source to avoid
    hitting the verifier jump sequence complexity limit.
  - verif_scale_pyperf600 now passes; other pyperf600 variants unchanged.

 tools/testing/selftests/bpf/progs/pyperf.h    | 4 +++-
 tools/testing/selftests/bpf/progs/pyperf600.c | 7 +++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/progs/pyperf.h b/tools/testing/selftests/bpf/progs/pyperf.h
index 86484f07e1d1..c02c49c52c77 100644
--- a/tools/testing/selftests/bpf/progs/pyperf.h
+++ b/tools/testing/selftests/bpf/progs/pyperf.h
@@ -343,8 +343,9 @@ int __on_event(struct bpf_raw_tracepoint_args *ctx)
 	return 0;
 }
 
+#ifndef PYPERF_CUSTOM_ON_EVENT
 SEC("raw_tracepoint/kfree_skb")
-int on_event(struct bpf_raw_tracepoint_args* ctx)
+int on_event(struct bpf_raw_tracepoint_args *ctx)
 {
 	int ret = 0;
 	ret |= __on_event(ctx);
@@ -354,5 +355,6 @@ int on_event(struct bpf_raw_tracepoint_args* ctx)
 	ret |= __on_event(ctx);
 	return ret;
 }
+#endif
 
 char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/bpf/progs/pyperf600.c b/tools/testing/selftests/bpf/progs/pyperf600.c
index ce1aa5189cc4..31e8a422d804 100644
--- a/tools/testing/selftests/bpf/progs/pyperf600.c
+++ b/tools/testing/selftests/bpf/progs/pyperf600.c
@@ -9,4 +9,11 @@
  * the loop will still execute 600 times.
  */
 #define UNROLL_COUNT 150
+#define PYPERF_CUSTOM_ON_EVENT
 #include "pyperf.h"
+
+SEC("raw_tracepoint/kfree_skb")
+int on_event(struct bpf_raw_tracepoint_args *ctx)
+{
+	return __on_event(ctx);
+}

base-commit: 5ee8dbf54602dc340d6235b1d6aa17c0f283f48c
-- 
2.43.0