[v2,bpf-next,3/4] bpf: test_run: Propagate bpf_flow_dissect's retval to user's bpf_attr.test.retval

Commit Message

Shmulik Ladkani Aug. 21, 2022, 11:35 a.m. UTC

Formerly, a boolean denoting whether bpf_flow_dissect returned BPF_OK
was set into 'bpf_attr.test.retval'.

Augment this, so users can check the actual return code of the dissector
program under test.

Existing prog_tests/flow_dissector*.c tests were correspondingly changed
to check against each test's expected retval.
Also, tests' resulting 'flow_keys' are verified only in case the expected
retval is BPF_OK. This allows adding new tests that expect non BPF_OK.

Signed-off-by: Shmulik Ladkani <[e-mail]>
---
 net/bpf/test_run.c                            |  2 +-
 .../selftests/bpf/prog_tests/flow_dissector.c | 23 ++++++++++++++++++-
 .../prog_tests/flow_dissector_load_bytes.c    |  2 +-
 3 files changed, 24 insertions(+), 3 deletions(-)

Patch

diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index 51c479433517..25d8ecf105aa 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -1445,7 +1445,7 @@  int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 	bpf_test_timer_enter(&t);
 	do {
 		retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
-					  size, flags) == BPF_OK;
+					  size, flags);
 	} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
 	bpf_test_timer_leave(&t);
 
diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
index 0c1661ea996e..8fa3c454995e 100644
--- a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
+++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
@@ -100,6 +100,7 @@  struct test {
 	} pkt;
 	struct bpf_flow_keys keys;
 	__u32 flags;
+	__u32 retval;
 };
 
 #define VLAN_HLEN	4
@@ -126,6 +127,7 @@  struct test tests[] = {
 			.sport = 80,
 			.dport = 8080,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv6",
@@ -146,6 +148,7 @@  struct test tests[] = {
 			.sport = 80,
 			.dport = 8080,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "802.1q-ipv4",
@@ -168,6 +171,7 @@  struct test tests[] = {
 			.sport = 80,
 			.dport = 8080,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "802.1ad-ipv6",
@@ -191,6 +195,7 @@  struct test tests[] = {
 			.sport = 80,
 			.dport = 8080,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv4-frag",
@@ -217,6 +222,7 @@  struct test tests[] = {
 			.dport = 8080,
 		},
 		.flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv4-no-frag",
@@ -239,6 +245,7 @@  struct test tests[] = {
 			.is_frag = true,
 			.is_first_frag = true,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv6-frag",
@@ -265,6 +272,7 @@  struct test tests[] = {
 			.dport = 8080,
 		},
 		.flags = BPF_FLOW_DISSECTOR_F_PARSE_1ST_FRAG,
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv6-no-frag",
@@ -287,6 +295,7 @@  struct test tests[] = {
 			.is_frag = true,
 			.is_first_frag = true,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv6-flow-label",
@@ -309,6 +318,7 @@  struct test tests[] = {
 			.dport = 8080,
 			.flow_label = __bpf_constant_htonl(0xbeeef),
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipv6-no-flow-label",
@@ -331,6 +341,7 @@  struct test tests[] = {
 			.flow_label = __bpf_constant_htonl(0xbeeef),
 		},
 		.flags = BPF_FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL,
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipip-encap",
@@ -359,6 +370,7 @@  struct test tests[] = {
 			.sport = 80,
 			.dport = 8080,
 		},
+		.retval = BPF_OK,
 	},
 	{
 		.name = "ipip-no-encap",
@@ -386,6 +398,7 @@  struct test tests[] = {
 			.is_encap = true,
 		},
 		.flags = BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP,
+		.retval = BPF_OK,
 	},
 };
 
@@ -503,6 +516,10 @@  static void run_tests_skb_less(int tap_fd, struct bpf_map *keys)
 		err = tx_tap(tap_fd, &tests[i].pkt, sizeof(tests[i].pkt));
 		CHECK(err < 0, "tx_tap", "err %d errno %d\n", err, errno);
 
+		/* check the stored flow_keys only if BPF_OK expected */
+		if (tests[i].retval != BPF_OK)
+			continue;
+
 		err = bpf_map_lookup_elem(keys_fd, &key, &flow_keys);
 		ASSERT_OK(err, "bpf_map_lookup_elem");
 
@@ -588,7 +605,11 @@  void test_flow_dissector(void)
 
 		err = bpf_prog_test_run_opts(prog_fd, &topts);
 		ASSERT_OK(err, "test_run");
-		ASSERT_EQ(topts.retval, 1, "test_run retval");
+		ASSERT_EQ(topts.retval, tests[i].retval, "test_run retval");
+
+		/* check the resulting flow_keys only if BPF_OK returned */
+		if (topts.retval != BPF_OK)
+			continue;
 		ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
 			  "test_run data_size_out");
 		CHECK_FLOW_KEYS(tests[i].name, flow_keys, tests[i].keys);
diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c
index 36afb409c25f..c7a47b57ac91 100644
--- a/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c
+++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector_load_bytes.c
@@ -44,7 +44,7 @@  void serial_test_flow_dissector_load_bytes(void)
 	ASSERT_OK(err, "test_run");
 	ASSERT_EQ(topts.data_size_out, sizeof(flow_keys),
 		  "test_run data_size_out");
-	ASSERT_EQ(topts.retval, 1, "test_run retval");
+	ASSERT_EQ(topts.retval, BPF_OK, "test_run retval");
 
 	if (fd >= -1)
 		close(fd);