netdev - [PATCH bpf-next v3 2/5] selftests/bpf: skip verifier tests for unsupported program types

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Message-Id: <20190128172119.12105-3-sdf@google.com>
Date:   Mon, 28 Jan 2019 09:21:16 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, ast@...nel.org, daniel@...earbox.net,
        Stanislav Fomichev <sdf@...gle.com>
Subject: [PATCH bpf-next v3 2/5] selftests/bpf: skip verifier tests for
 unsupported program types

Use recently introduced bpf_probe_prog_type() to skip tests in the
test_verifier() if bpf_verify_program() fails. The skipped test is
indicated in the output.

Example:

...
679/p bpf_get_stack return R0 within range SKIP (unsupported program
type 5)
680/p ld_abs: invalid op 1 OK
...
Summary: 863 PASSED, 165 SKIPPED, 3 FAILED

Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 tools/testing/selftests/bpf/test_verifier.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index c5e22422a852..2a36f9f2ee8f 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -34,6 +34,7 @@
 #include <linux/if_ether.h>
 
 #include <bpf/bpf.h>
+#include <bpf/libbpf.h>
 
 #ifdef HAVE_GENHDR
 # include "autoconf.h"
@@ -59,6 +60,7 @@
 
 #define UNPRIV_SYSCTL "kernel/unprivileged_bpf_disabled"
 static bool unpriv_disabled = false;
+static int skips;
 
 struct bpf_test {
 	const char *descr;
@@ -598,6 +600,11 @@ static void do_test_single(struct bpf_test *test, bool unpriv,
 		pflags |= BPF_F_ANY_ALIGNMENT;
 	fd_prog = bpf_verify_program(prog_type, prog, prog_len, pflags,
 				     "GPL", 0, bpf_vlog, sizeof(bpf_vlog), 1);
+	if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
+		printf("SKIP (unsupported program type %d)\n", prog_type);
+		skips++;
+		goto close_fds;
+	}
 
 	expected_ret = unpriv && test->result_unpriv != UNDEF ?
 		       test->result_unpriv : test->result;
@@ -751,7 +758,7 @@ static bool test_as_unpriv(struct bpf_test *test)
 
 static int do_test(bool unpriv, unsigned int from, unsigned int to)
 {
-	int i, passes = 0, errors = 0, skips = 0;
+	int i, passes = 0, errors = 0;
 
 	for (i = from; i < to; i++) {
 		struct bpf_test *test = &tests[i];
-- 
2.20.1.495.gaa96b0ce6b-goog