[PATCH bpf-next v2] selftests/bpf: Use start_server and connect_fd_to_fd

[Geliang Tang <geliang@xxxxxxxxxx>]

From: Geliang Tang <tanggeliang@xxxxxxxxxx>

To simplify the code, use BPF selftests helpers start_server() and
connect_fd_to_fd() in bpf_tcp_ca.c instead of open-coding. These helpers
are defined in network_helpers.c, and exported in network_helpers.h,
which is already included in bpf_tcp_ca.c.

Signed-off-by: Geliang Tang <tanggeliang@xxxxxxxxxx>
---
v2:
 - use connect_fd_to_fd too.
---
 .../selftests/bpf/prog_tests/bpf_tcp_ca.c     | 24 +++----------------
 1 file changed, 3 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
index a88e6e07e4f5..3da3030c9365 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
@@ -78,18 +78,16 @@ static void *server(void *arg)
 
 static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 {
-	struct sockaddr_in6 sa6 = {};
 	ssize_t nr_recv = 0, bytes = 0;
 	int lfd = -1, fd = -1;
 	pthread_t srv_thread;
-	socklen_t addrlen = sizeof(sa6);
 	void *thread_ret;
 	char batch[1500];
 	int err;
 
 	WRITE_ONCE(stop, 0);
 
-	lfd = socket(AF_INET6, SOCK_STREAM, 0);
+	lfd = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
 	if (!ASSERT_NEQ(lfd, -1, "socket"))
 		return;
 
@@ -99,23 +97,7 @@ static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 		return;
 	}
 
-	if (settcpca(lfd, tcp_ca) || settcpca(fd, tcp_ca) ||
-	    settimeo(lfd, 0) || settimeo(fd, 0))
-		goto done;
-
-	/* bind, listen and start server thread to accept */
-	sa6.sin6_family = AF_INET6;
-	sa6.sin6_addr = in6addr_loopback;
-	err = bind(lfd, (struct sockaddr *)&sa6, addrlen);
-	if (!ASSERT_NEQ(err, -1, "bind"))
-		goto done;
-
-	err = getsockname(lfd, (struct sockaddr *)&sa6, &addrlen);
-	if (!ASSERT_NEQ(err, -1, "getsockname"))
-		goto done;
-
-	err = listen(lfd, 1);
-	if (!ASSERT_NEQ(err, -1, "listen"))
+	if (settcpca(lfd, tcp_ca) || settcpca(fd, tcp_ca))
 		goto done;
 
 	if (sk_stg_map) {
@@ -126,7 +108,7 @@ static void do_test(const char *tcp_ca, const struct bpf_map *sk_stg_map)
 	}
 
 	/* connect to server */
-	err = connect(fd, (struct sockaddr *)&sa6, addrlen);
+	err = connect_fd_to_fd(fd, lfd, 0);
 	if (!ASSERT_NEQ(err, -1, "connect"))
 		goto done;
 
-- 
2.40.1