selftests/tls: fix TLS tests with CONFIG_TLS=n

Build bot reports some recent TLS tests are failing
with CONFIG_TLS=n. Correct the expected return code
and skip TLS installation if not supported.

Tested with CONFIG_TLS=n and CONFIG_TLS=m.
Reported-by: kernel test robot <rong.a.chen@intel.com>
Fixes: cf32526c ("selftests/tls: add a test for ULP but no keys")
Fixes: 65d41fb3 ("selftests/tls: add a bidirectional test")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/tls.c

@@ -69,7 +69,7 @@ FIXTURE_SETUP(tls_basic)
 
 	ret = setsockopt(self->fd, IPPROTO_TCP, TCP_ULP, "tls", sizeof("tls"));
 	if (ret != 0) {
-		ASSERT_EQ(errno, ENOTSUPP);
+		ASSERT_EQ(errno, ENOENT);
 		self->notls = true;
 		printf("Failure setting TCP_ULP, testing without tls\n");
 		return;
@@ -696,21 +696,26 @@ TEST_F(tls, recv_lowat)
 
 TEST_F(tls, bidir)
 {
-	struct tls12_crypto_info_aes_gcm_128 tls12;
 	char const *test_str = "test_read";
 	int send_len = 10;
 	char buf[10];
 	int ret;
 
+	if (!self->notls) {
+		struct tls12_crypto_info_aes_gcm_128 tls12;
+
 		memset(&tls12, 0, sizeof(tls12));
 		tls12.info.version = TLS_1_3_VERSION;
 		tls12.info.cipher_type = TLS_CIPHER_AES_GCM_128;
 
-	ret = setsockopt(self->fd, SOL_TLS, TLS_RX, &tls12, sizeof(tls12));
+		ret = setsockopt(self->fd, SOL_TLS, TLS_RX, &tls12,
+				 sizeof(tls12));
 		ASSERT_EQ(ret, 0);
 
-	ret = setsockopt(self->cfd, SOL_TLS, TLS_TX, &tls12, sizeof(tls12));
+		ret = setsockopt(self->cfd, SOL_TLS, TLS_TX, &tls12,
+				 sizeof(tls12));
 		ASSERT_EQ(ret, 0);
+	}
 
 	ASSERT_EQ(strlen(test_str) + 1, send_len);