role of the server, and the main testing thread plays the role of client.

Add logic to the end of the run_test function to guarantee that the sockets
are closed when we begin verifying results.

Doing this we are able to reduce overhead since we don't have two python
workers possibly floating around. In addition we don't have to worry about
synchronization issues and as such the retry loop waiting for the threads
to close the sockets can be dropped as we will have already closed the
sockets in the local executable and synchronized the server thread.

Signed-off-by: Alexander Duyck <alexanderduyck@fb.com>
---
 .../testing/selftests/bpf/prog_tests/tcpbpf_user.c |   96 ++++++++++++++++----
 tools/testing/selftests/bpf/tcp_client.py          |   50 ----------
 tools/testing/selftests/bpf/tcp_server.py          |   80 -----------------
 3 files changed, 78 insertions(+), 148 deletions(-)
 delete mode 100755 tools/testing/selftests/bpf/tcp_client.py
 delete mode 100755 tools/testing/selftests/bpf/tcp_server.py

diff --git a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
index 54f1dce97729..17d4299435df 100644
--- a/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c
+++ b/tools/testing/selftests/bpf/prog_tests/tcpbpf_user.c

@@ -1,13 +1,14 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <inttypes.h>
 #include <test_progs.h>
+#include <network_helpers.h>
 
 #include "test_tcpbpf.h"
 
+#define LO_ADDR6 "::1"
 #define CG_NAME "/tcpbpf-user-test"
 
-/* 3 comes from one listening socket + both ends of the connection */
-#define EXPECTED_CLOSE_EVENTS		3
+static __u32 duration;
 
 #define EXPECT_EQ(expected, actual, fmt)			\
 	do {							\

@@ -42,7 +43,9 @@ int verify_result(const struct tcpbpf_globals *result)
 	EXPECT_EQ(0x80, result->bad_cb_test_rv, PRIu32);
 	EXPECT_EQ(0, result->good_cb_test_rv, PRIu32);
 	EXPECT_EQ(1, result->num_listen, PRIu32);
-	EXPECT_EQ(EXPECTED_CLOSE_EVENTS, result->num_close_events, PRIu32);
+
+	/* 3 comes from one listening socket + both ends of the connection */
+	EXPECT_EQ(3, result->num_close_events, PRIu32);
 
 	return ret;
 }

@@ -66,6 +69,75 @@ int verify_sockopt_result(int sock_map_fd)
 	return ret;
 }
 
+static int run_test(void)
+{
+	int listen_fd = -1, cli_fd = -1, accept_fd = -1;
+	char buf[1000];
+	int err = -1;
+	int i;
+
+	listen_fd = start_server(AF_INET6, SOCK_STREAM, LO_ADDR6, 0, 0);
+	if (CHECK(listen_fd == -1, "start_server", "listen_fd:%d errno:%d\n",
+		  listen_fd, errno))
+		goto done;
+
+	cli_fd = connect_to_fd(listen_fd, 0);
+	if (CHECK(cli_fd == -1, "connect_to_fd(listen_fd)",
+		  "cli_fd:%d errno:%d\n", cli_fd, errno))
+		goto done;
+
+	accept_fd = accept(listen_fd, NULL, NULL);
+	if (CHECK(accept_fd == -1, "accept(listen_fd)",
+		  "accept_fd:%d errno:%d\n", accept_fd, errno))
+		goto done;
+
+	/* Send 1000B of '+'s from cli_fd -> accept_fd */
+	for (i = 0; i < 1000; i++)
+		buf[i] = '+';
+
+	err = send(cli_fd, buf, 1000, 0);
+	if (CHECK(err != 1000, "send(cli_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
+
+	err = recv(accept_fd, buf, 1000, 0);
+	if (CHECK(err != 1000, "recv(accept_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
+
+	/* Send 500B of '.'s from accept_fd ->cli_fd */
+	for (i = 0; i < 500; i++)
+		buf[i] = '.';
+
+	err = send(accept_fd, buf, 500, 0);
+	if (CHECK(err != 500, "send(accept_fd)", "err:%d errno:%d\n", err, errno))
+		goto done;
+
+	err = recv(cli_fd, buf, 500, 0);

+	if (listen_fd != -1)
+		close(listen_fd);
+
+	return err;
+}
+
 void test_tcpbpf_user(void)
 {
 	const char *file = "test_tcpbpf_kern.o";

@@ -74,7 +146,6 @@ void test_tcpbpf_user(void)
 	int error = EXIT_FAILURE;
 	struct bpf_object *obj;
 	int cg_fd = -1;
-	int retry = 10;
 	__u32 key = 0;
 	int rv;
 

@@ -94,11 +165,6 @@ void test_tcpbpf_user(void)
 		goto err;
 	}
 
-	if (system("./tcp_server.py")) {
-		fprintf(stderr, "FAILED: TCP server\n");
-		goto err;
-	}
-
 	map_fd = bpf_find_map(__func__, obj, "global_map");
 	if (map_fd < 0)
 		goto err;

@@ -107,21 +173,15 @@ void test_tcpbpf_user(void)
 	if (sock_map_fd < 0)
 		goto err;
 
-retry_lookup:
+	if (run_test())
+		goto err;
+
 	rv = bpf_map_lookup_elem(map_fd, &key, &g);
 	if (rv != 0) {
 		fprintf(stderr, "FAILED: bpf_map_lookup_elem returns %d\n", rv);
 		goto err;
 	}
 
-	if (g.num_close_events != EXPECTED_CLOSE_EVENTS && retry--) {
-		fprintf(stderr,
-			"Unexpected number of close events (%d), retrying!\n",
-			g.num_close_events);
-		usleep(100);
-		goto retry_lookup;
-	}
-
 	if (verify_result(&g)) {
 		fprintf(stderr, "FAILED: Wrong stats\n");
 		goto err;