selftests/bpf: Pass just bpf_map to xdp_context_test helper

Prepare for parametrizing the xdp_context tests. The assert_test_result
helper doesn't need the whole skeleton. Pass just what it needs.

Signed-off-by: Jakub Sitnicki <[email protected]>
Signed-off-by: Martin KaFai Lau <[email protected]>
Reviewed-by: Jesse Brandeburg <[email protected]>
Acked-by: Eduard Zingerman <[email protected]>
Link: https://patch.msgid.link/20250814-skb-metadata-thru-dynptr-v7-4-8a39e636e0fb@cloudflare.com

Author: jsitnicki

tools/testing/selftests/bpf/prog_tests/xdp_context_test_run.c

@@ -156,15 +156,14 @@ static int send_test_packet(int ifindex)
 	return -1;
 }
 
-static void assert_test_result(struct test_xdp_meta *skel)
+static void assert_test_result(const struct bpf_map *result_map)
 {
 	int err;
 	__u32 map_key = 0;
 	__u8 map_value[TEST_PAYLOAD_LEN];
 
-	err = bpf_map__lookup_elem(skel->maps.test_result, &map_key,
-				   sizeof(map_key), &map_value,
-				   TEST_PAYLOAD_LEN, BPF_ANY);
+	err = bpf_map__lookup_elem(result_map, &map_key, sizeof(map_key),
+				   &map_value, TEST_PAYLOAD_LEN, BPF_ANY);
 	if (!ASSERT_OK(err, "lookup test_result"))
 		return;
 
@@ -248,7 +247,7 @@ void test_xdp_context_veth(void)
 	if (!ASSERT_OK(ret, "send_test_packet"))
 		goto close;
 
-	assert_test_result(skel);
+	assert_test_result(skel->maps.test_result);
 
 close:
 	close_netns(nstoken);
@@ -313,7 +312,7 @@ void test_xdp_context_tuntap(void)
 	if (!ASSERT_EQ(ret, sizeof(packet), "write packet"))
 		goto close;
 
-	assert_test_result(skel);
+	assert_test_result(skel->maps.test_result);
 
 close:
 	if (tap_fd >= 0)