selftests/bpf: Drop must_fail from network_helper_opts

The struct member "must_fail" of network_helper_opts() is only used in
cgroup_v1v2 tests, it makes sense to drop it from network_helper_opts.

Return value (fd) of connect_to_fd_opts() and the expect errno (EPERM)
can be checked in cgroup_v1v2.c directly, no need to check them in
connect_fd_to_addr() in network_helpers.c.

This also makes connect_fd_to_addr() function useless. It can be replaced
by connect().

Suggested-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
Link: https://lore.kernel.org/r/3faf336019a9a48e2e8951f4cdebf19e3ac6e441.1721282219.git.tanggeliang@kylinos.cn
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

tools/testing/selftests/bpf/network_helpers.c

@@ -277,33 +277,6 @@ error_close:
 	return -1;
 }
 
-static int connect_fd_to_addr(int fd,
-			      const struct sockaddr_storage *addr,
-			      socklen_t addrlen, const bool must_fail)
-{
-	int ret;
-
-	errno = 0;
-	ret = connect(fd, (const struct sockaddr *)addr, addrlen);
-	if (must_fail) {
-		if (!ret) {
-			log_err("Unexpected success to connect to server");
-			return -1;
-		}
-		if (errno != EPERM) {
-			log_err("Unexpected error from connect to server");
-			return -1;
-		}
-	} else {
-		if (ret) {
-			log_err("Failed to connect to server");
-			return -1;
-		}
-	}
-
-	return 0;
-}
-
 int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t addrlen,
 		    const struct network_helper_opts *opts)
 {
@@ -318,14 +291,13 @@ int connect_to_addr(int type, const struct sockaddr_storage *addr, socklen_t add
 		return -1;
 	}
 
-	if (connect_fd_to_addr(fd, addr, addrlen, opts->must_fail))
-		goto error_close;
+	if (connect(fd, (const struct sockaddr *)addr, addrlen)) {
+		log_err("Failed to connect to server");
+		save_errno_close(fd);
+		return -1;
+	}
 
 	return fd;
-
-error_close:
-	save_errno_close(fd);
-	return -1;
 }
 
 int connect_to_fd_opts(int server_fd, const struct network_helper_opts *opts)
@@ -383,8 +355,10 @@ int connect_fd_to_fd(int client_fd, int server_fd, int timeout_ms)
 		return -1;
 	}
 
-	if (connect_fd_to_addr(client_fd, &addr, len, false))
+	if (connect(client_fd, (const struct sockaddr *)&addr, len)) {
+		log_err("Failed to connect to server");
 		return -1;
+	}
 
 	return 0;
 }

tools/testing/selftests/bpf/network_helpers.h

@@ -23,7 +23,6 @@ typedef __u16 __sum16;
 
 struct network_helper_opts {
 	int timeout_ms;
-	bool must_fail;
 	int proto;
 	/* +ve: Passed to listen() as-is.
 	 *   0: Default when the test does not set

tools/testing/selftests/bpf/prog_tests/cgroup_v1v2.c

@@ -9,9 +9,6 @@
 
 static int run_test(int cgroup_fd, int server_fd, bool classid)
 {
-	struct network_helper_opts opts = {
-		.must_fail = true,
-	};
 	struct connect4_dropper *skel;
 	int fd, err = 0;
 
@@ -32,11 +29,16 @@ static int run_test(int cgroup_fd, int server_fd, bool classid)
 		goto out;
 	}
 
-	fd = connect_to_fd_opts(server_fd, &opts);
-	if (fd < 0)
+	errno = 0;
+	fd = connect_to_fd_opts(server_fd, NULL);
+	if (fd >= 0) {
+		log_err("Unexpected success to connect to server");
 		err = -1;
-	else
 		close(fd);
+	} else if (errno != EPERM) {
+		log_err("Unexpected errno from connect to server");
+		err = -1;
+	}
 out:
 	connect4_dropper__destroy(skel);
 	return err;