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Date: Mon, 15 Jan 2024 12:54:38 +0100
From: Stefano Garzarella <sgarzare@redhat.com>
To: Arseniy Krasnov <avkrasnov@salutedevices.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>, 
	"David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, 
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, 
	"Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, 
	Bobby Eshleman <bobby.eshleman@bytedance.com>, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, 
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@sberdevices.ru, 
	oxffffaa@gmail.com
Subject: Re: [RFC PATCH v1] vsock/test: add '--peer-port' input argument
Message-ID: <4uvvqjlo6ncoyts3rv3dd7joxrgrde4q2ddjd2eexclhhxx2zm@27thero57yam>
References: <20240112212110.1906150-1-avkrasnov@salutedevices.com>
Precedence: bulk
MIME-Version: 1.0
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In-Reply-To: <20240112212110.1906150-1-avkrasnov@salutedevices.com>

Hi Arseniy,
thanks for this patch!

On Sat, Jan 13, 2024 at 12:21:10AM +0300, Arseniy Krasnov wrote:
>Implement port for given CID as input argument instead of using
>hardcoded value '1234'. This allows to run different test instances
>on a single CID. Port argument is not required parameter and if it is
>not set, then default value will be '1234' - thus we preserve previous
>behaviour.
>
>Signed-off-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
>---
> tools/testing/vsock/util.c                | 17 +++-
> tools/testing/vsock/util.h                |  4 +
> tools/testing/vsock/vsock_diag_test.c     | 18 ++++-
> tools/testing/vsock/vsock_test.c          | 96 +++++++++++++----------
> tools/testing/vsock/vsock_test_zerocopy.c | 12 +--
> tools/testing/vsock/vsock_uring_test.c    | 16 +++-
> 6 files changed, 107 insertions(+), 56 deletions(-)
>
>diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
>index ae2b33c21c45..554b290fefdc 100644
>--- a/tools/testing/vsock/util.c
>+++ b/tools/testing/vsock/util.c
>@@ -33,8 +33,7 @@ void init_signals(void)
> 	signal(SIGPIPE, SIG_IGN);
> }
>
>-/* Parse a CID in string representation */
>-unsigned int parse_cid(const char *str)
>+static unsigned int parse_uint(const char *str, const char *err_str)
> {
> 	char *endptr = NULL;
> 	unsigned long n;
>@@ -42,12 +41,24 @@ unsigned int parse_cid(const char *str)
> 	errno = 0;
> 	n = strtoul(str, &endptr, 10);
> 	if (errno || *endptr != '\0') {
>-		fprintf(stderr, "malformed CID \"%s\"\n", str);
>+		fprintf(stderr, "malformed %s \"%s\"\n", err_str, str);
> 		exit(EXIT_FAILURE);
> 	}
> 	return n;
> }
>
>+/* Parse a CID in string representation */
>+unsigned int parse_cid(const char *str)
>+{
>+	return parse_uint(str, "CID");
>+}
>+
>+/* Parse a port in string representation */
>+unsigned int parse_port(const char *str)
>+{
>+	return parse_uint(str, "port");
>+}
>+
> /* Wait for the remote to close the connection */
> void vsock_wait_remote_close(int fd)
> {
>diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h
>index 03c88d0cb861..e95e62485959 100644
>--- a/tools/testing/vsock/util.h
>+++ b/tools/testing/vsock/util.h
>@@ -12,10 +12,13 @@ enum test_mode {
> 	TEST_MODE_SERVER
> };
>
>+#define DEFAULT_PEER_PORT	1234
>+
> /* Test runner options */
> struct test_opts {
> 	enum test_mode mode;
> 	unsigned int peer_cid;
>+	unsigned int peer_port;
> };
>
> /* A test case definition.  Test functions must print failures to stderr and
>@@ -35,6 +38,7 @@ struct test_case {
>
> void init_signals(void);
> unsigned int parse_cid(const char *str);
>+unsigned int parse_port(const char *str);
> int vsock_stream_connect(unsigned int cid, unsigned int port);
> int vsock_bind_connect(unsigned int cid, unsigned int port,
> 		       unsigned int bind_port, int type);
>diff --git a/tools/testing/vsock/vsock_diag_test.c b/tools/testing/vsock/vsock_diag_test.c
>index fa927ad16f8a..5e6049226b77 100644
>--- a/tools/testing/vsock/vsock_diag_test.c
>+++ b/tools/testing/vsock/vsock_diag_test.c
>@@ -342,7 +342,7 @@ static void test_listen_socket_server(const struct test_opts *opts)
> 	} addr = {
> 		.svm = {
> 			.svm_family = AF_VSOCK,
>-			.svm_port = 1234,
>+			.svm_port = opts->peer_port,
> 			.svm_cid = VMADDR_CID_ANY,
> 		},
> 	};
>@@ -378,7 +378,7 @@ static void test_connect_client(const struct test_opts *opts)
> 	LIST_HEAD(sockets);
> 	struct vsock_stat *st;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -403,7 +403,7 @@ static void test_connect_server(const struct test_opts *opts)
> 	LIST_HEAD(sockets);
> 	int client_fd;
>
>-	client_fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	client_fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (client_fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -461,6 +461,11 @@ static const struct option longopts[] = {
> 		.has_arg = required_argument,
> 		.val = 'p',
> 	},
>+	{
>+		.name = "peer-port",
>+		.has_arg = required_argument,
>+		.val = 'q',
>+	},
> 	{
> 		.name = "list",
> 		.has_arg = no_argument,
>@@ -481,7 +486,7 @@ static const struct option longopts[] = {
>
> static void usage(void)
> {
>-	fprintf(stderr, "Usage: vsock_diag_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--list] [--skip=<test_id>]\n"
>+	fprintf(stderr, "Usage: vsock_diag_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--peer-port=<port>] [--list] [--skip=<test_id>]\n"
> 		"\n"
> 		"  Server: vsock_diag_test --control-port=1234 --mode=server --peer-cid=3\n"
> 		"  Client: vsock_diag_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
>@@ -503,6 +508,7 @@ static void usage(void)
> 		"  --control-port <port>  Server port to listen on/connect to\n"
> 		"  --mode client|server   Server or client mode\n"
> 		"  --peer-cid <cid>       CID of the other side\n"
>+		"  --peer-port <port>     Port of the other side\n"

I'd suggest adding the default value and rewording a bit. Something like 
this (applied on vsock_test, but should be similar):

--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -1595,10 +1595,11 @@ static void usage(void)
                 "  --control-port <port>  Server port to listen on/connect to\n"
                 "  --mode client|server   Server or client mode\n"
                 "  --peer-cid <cid>       CID of the other side\n"
-               "  --peer-port <port>     Port of the other side\n"
+               "  --peer-port <port>     AF_VSOCK port used for the test [default: %d]\n"
                 "  --list                 List of tests that will be executed\n"
                 "  --skip <test_id>       Test ID to skip;\n"
-               "                         use multiple --skip options to skip more tests\n"
+               "                         use multiple --skip options to skip more tests\n",
+               DEFAULT_PEER_PORT
                 );
         exit(EXIT_FAILURE);
  }

> 		"  --list                 List of tests that will be executed\n"
> 		"  --skip <test_id>       Test ID to skip;\n"
> 		"                         use multiple --skip options to skip more tests\n"
>@@ -517,6 +523,7 @@ int main(int argc, char **argv)
> 	struct test_opts opts = {
> 		.mode = TEST_MODE_UNSET,
> 		.peer_cid = VMADDR_CID_ANY,
>+		.peer_port = DEFAULT_PEER_PORT

I'd add a comma:

		.peer_port = DEFAULT_PEER_PORT,

> 	};
>
> 	init_signals();
>@@ -544,6 +551,9 @@ int main(int argc, char **argv)
> 		case 'p':
> 			opts.peer_cid = parse_cid(optarg);
> 			break;
>+		case 'q':
>+			opts.peer_port = parse_port(optarg);
>+			break;
> 		case 'P':
> 			control_port = optarg;
> 			break;
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 66246d81d654..58574f4d1fe1 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -34,7 +34,7 @@ static void test_stream_connection_reset(const struct test_opts *opts)
> 	} addr = {
> 		.svm = {
> 			.svm_family = AF_VSOCK,
>-			.svm_port = 1234,
>+			.svm_port = opts->peer_port,
> 			.svm_cid = opts->peer_cid,
> 		},
> 	};
>@@ -70,7 +70,7 @@ static void test_stream_bind_only_client(const struct test_opts *opts)
> 	} addr = {
> 		.svm = {
> 			.svm_family = AF_VSOCK,
>-			.svm_port = 1234,
>+			.svm_port = opts->peer_port,
> 			.svm_cid = opts->peer_cid,
> 		},
> 	};
>@@ -112,7 +112,7 @@ static void test_stream_bind_only_server(const struct test_opts *opts)
> 	} addr = {
> 		.svm = {
> 			.svm_family = AF_VSOCK,
>-			.svm_port = 1234,
>+			.svm_port = opts->peer_port,
> 			.svm_cid = VMADDR_CID_ANY,
> 		},
> 	};
>@@ -138,7 +138,7 @@ static void test_stream_client_close_client(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -152,7 +152,7 @@ static void test_stream_client_close_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -173,7 +173,7 @@ static void test_stream_server_close_client(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -194,7 +194,7 @@ static void test_stream_server_close_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -215,7 +215,7 @@ static void test_stream_multiconn_client(const struct test_opts *opts)
> 	int i;
>
> 	for (i = 0; i < MULTICONN_NFDS; i++) {
>-		fds[i] = vsock_stream_connect(opts->peer_cid, 1234);
>+		fds[i] = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 		if (fds[i] < 0) {
> 			perror("connect");
> 			exit(EXIT_FAILURE);
>@@ -239,7 +239,7 @@ static void test_stream_multiconn_server(const struct test_opts *opts)
> 	int i;
>
> 	for (i = 0; i < MULTICONN_NFDS; i++) {
>-		fds[i] = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fds[i] = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 		if (fds[i] < 0) {
> 			perror("accept");
> 			exit(EXIT_FAILURE);
>@@ -267,9 +267,9 @@ static void test_msg_peek_client(const struct test_opts *opts,
> 	int i;
>
> 	if (seqpacket)
>-		fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+		fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	else
>-		fd = vsock_stream_connect(opts->peer_cid, 1234);
>+		fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
>
> 	if (fd < 0) {
> 		perror("connect");
>@@ -295,9 +295,9 @@ static void test_msg_peek_server(const struct test_opts *opts,
> 	int fd;
>
> 	if (seqpacket)
>-		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	else
>-		fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
>
> 	if (fd < 0) {
> 		perror("accept");
>@@ -363,7 +363,7 @@ static void test_seqpacket_msg_bounds_client(const struct test_opts *opts)
> 	int msg_count;
> 	int fd;
>
>-	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+	fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -434,7 +434,7 @@ static void test_seqpacket_msg_bounds_server(const struct test_opts *opts)
> 	struct msghdr msg = {0};
> 	struct iovec iov = {0};
>
>-	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -505,7 +505,7 @@ static void test_seqpacket_msg_trunc_client(const struct test_opts *opts)
> 	int fd;
> 	char buf[MESSAGE_TRUNC_SZ];
>
>-	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+	fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -524,7 +524,7 @@ static void test_seqpacket_msg_trunc_server(const struct test_opts *opts)
> 	struct msghdr msg = {0};
> 	struct iovec iov = {0};
>
>-	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -575,7 +575,7 @@ static void test_seqpacket_timeout_client(const struct test_opts *opts)
> 	time_t read_enter_ns;
> 	time_t read_overhead_ns;
>
>-	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+	fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -620,7 +620,7 @@ static void test_seqpacket_timeout_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -639,7 +639,7 @@ static void test_seqpacket_bigmsg_client(const struct test_opts *opts)
>
> 	len = sizeof(sock_buf_size);
>
>-	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+	fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -671,7 +671,7 @@ static void test_seqpacket_bigmsg_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -692,7 +692,7 @@ static void test_seqpacket_invalid_rec_buffer_client(const struct test_opts *opt
> 	unsigned char *buf2;
> 	int buf_size = getpagesize() * 3;
>
>-	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+	fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -732,7 +732,7 @@ static void test_seqpacket_invalid_rec_buffer_server(const struct test_opts *opt
> 	int flags = MAP_PRIVATE | MAP_ANONYMOUS;
> 	int i;
>
>-	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -808,7 +808,7 @@ static void test_stream_poll_rcvlowat_server(const struct test_opts *opts)
> 	int fd;
> 	int i;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -839,7 +839,7 @@ static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
> 	short poll_flags;
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -906,9 +906,9 @@ static void test_inv_buf_client(const struct test_opts *opts, bool stream)
> 	int fd;
>
> 	if (stream)
>-		fd = vsock_stream_connect(opts->peer_cid, 1234);
>+		fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	else
>-		fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+		fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
>
> 	if (fd < 0) {
> 		perror("connect");
>@@ -941,9 +941,9 @@ static void test_inv_buf_server(const struct test_opts *opts, bool stream)
> 	int fd;
>
> 	if (stream)
>-		fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	else
>-		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
>
> 	if (fd < 0) {
> 		perror("accept");
>@@ -986,7 +986,7 @@ static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -1015,7 +1015,7 @@ static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
> 	unsigned char buf[64];
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -1108,7 +1108,7 @@ static void test_stream_shutwr_client(const struct test_opts *opts)
>
> 	sigaction(SIGPIPE, &act, NULL);
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -1130,7 +1130,7 @@ static void test_stream_shutwr_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -1151,7 +1151,7 @@ static void test_stream_shutrd_client(const struct test_opts *opts)
>
> 	sigaction(SIGPIPE, &act, NULL);
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -1170,7 +1170,7 @@ static void test_stream_shutrd_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -1193,7 +1193,7 @@ static void test_double_bind_connect_server(const struct test_opts *opts)
> 	struct sockaddr_vm sa_client;
> 	socklen_t socklen_client = sizeof(sa_client);
>
>-	listen_fd = vsock_stream_listen(VMADDR_CID_ANY, 1234);
>+	listen_fd = vsock_stream_listen(VMADDR_CID_ANY, opts->peer_port);
>
> 	for (i = 0; i < 2; i++) {
> 		control_writeln("LISTENING");
>@@ -1226,7 +1226,13 @@ static void test_double_bind_connect_client(const struct test_opts *opts)
> 		/* Wait until server is ready to accept a new connection */
> 		control_expectln("LISTENING");
>
>-		client_fd = vsock_bind_connect(opts->peer_cid, 1234, 4321, SOCK_STREAM);
>+		/* We use 'peer_port + 1' as "some" port for the 'bind()'
>+		 * call. It is safe for overflow, but must be considered,
>+		 * when running multiple test applications simultaneously
>+		 * where 'peer-port' argument differs by 1.
>+		 */

It is pre-existing, but I think we can fix here:
Should we mention in the help/usage that we use peer_port and peer_port 
+ 1 during the test?

Something like this:

@@ -1588,6 +1588,9 @@ static void usage(void)
                 "connect to.\n"
                 "\n"
                 "The CID of the other side must be given with --peer-cid=<cid>.\n"
+               "During the test, two AF_VSOCK ports will be used: the port\n"
+               "specified with --peer-port=<port> (or the default port)\n"
+               "and the next one.\n"
                 "\n"
                 "Options:\n"
                 "  --help                 This help message\n"

>+		client_fd = vsock_bind_connect(opts->peer_cid, opts->peer_port,
>+					       opts->peer_port + 1, SOCK_STREAM);
>
> 		close(client_fd);
> 	}
>@@ -1246,7 +1252,7 @@ static void test_stream_rcvlowat_def_cred_upd_client(const struct test_opts *opt
> 	void *buf;
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -1282,7 +1288,7 @@ static void test_stream_credit_update_test(const struct test_opts *opts,
> 	void *buf;
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -1542,6 +1548,11 @@ static const struct option longopts[] = {
> 		.has_arg = required_argument,
> 		.val = 'p',
> 	},
>+	{
>+		.name = "peer-port",
>+		.has_arg = required_argument,
>+		.val = 'q',
>+	},
> 	{
> 		.name = "list",
> 		.has_arg = no_argument,
>@@ -1562,7 +1573,7 @@ static const struct option longopts[] = {
>
> static void usage(void)
> {
>-	fprintf(stderr, "Usage: vsock_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--list] [--skip=<test_id>]\n"
>+	fprintf(stderr, "Usage: vsock_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--peer-port=<port>] [--list] [--skip=<test_id>]\n"
> 		"\n"
> 		"  Server: vsock_test --control-port=1234 --mode=server --peer-cid=3\n"
> 		"  Client: vsock_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
>@@ -1584,6 +1595,7 @@ static void usage(void)
> 		"  --control-port <port>  Server port to listen on/connect to\n"
> 		"  --mode client|server   Server or client mode\n"
> 		"  --peer-cid <cid>       CID of the other side\n"
>+		"  --peer-port <port>     Port of the other side\n"

Ditto (the default and rewording).

> 		"  --list                 List of tests that will be executed\n"
> 		"  --skip <test_id>       Test ID to skip;\n"
> 		"                         use multiple --skip options to 
> 		skip more tests\n"
>@@ -1598,6 +1610,7 @@ int main(int argc, char **argv)
> 	struct test_opts opts = {
> 		.mode = TEST_MODE_UNSET,
> 		.peer_cid = VMADDR_CID_ANY,
>+		.peer_port = DEFAULT_PEER_PORT

Ditto (the comma).

> 	};
>
> 	srand(time(NULL));
>@@ -1626,6 +1639,9 @@ int main(int argc, char **argv)
> 		case 'p':
> 			opts.peer_cid = parse_cid(optarg);
> 			break;
>+		case 'q':
>+			opts.peer_port = parse_port(optarg);
>+			break;
> 		case 'P':
> 			control_port = optarg;
> 			break;
>diff --git a/tools/testing/vsock/vsock_test_zerocopy.c b/tools/testing/vsock/vsock_test_zerocopy.c
>index a16ff76484e6..04c376b6937f 100644
>--- a/tools/testing/vsock/vsock_test_zerocopy.c
>+++ b/tools/testing/vsock/vsock_test_zerocopy.c
>@@ -152,9 +152,9 @@ static void test_client(const struct test_opts *opts,
> 	int fd;
>
> 	if (sock_seqpacket)
>-		fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
>+		fd = vsock_seqpacket_connect(opts->peer_cid, opts->peer_port);
> 	else
>-		fd = vsock_stream_connect(opts->peer_cid, 1234);
>+		fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
>
> 	if (fd < 0) {
> 		perror("connect");
>@@ -248,9 +248,9 @@ static void test_server(const struct test_opts *opts,
> 	int fd;
>
> 	if (sock_seqpacket)
>-		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_seqpacket_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	else
>-		fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+		fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
>
> 	if (fd < 0) {
> 		perror("accept");
>@@ -323,7 +323,7 @@ void test_stream_msgzcopy_empty_errq_client(const struct test_opts *opts)
> 	ssize_t res;
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -347,7 +347,7 @@ void test_stream_msgzcopy_empty_errq_server(const struct test_opts *opts)
> {
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>diff --git a/tools/testing/vsock/vsock_uring_test.c b/tools/testing/vsock/vsock_uring_test.c
>index d976d35f0ba9..4e363c6d6e4d 100644
>--- a/tools/testing/vsock/vsock_uring_test.c
>+++ b/tools/testing/vsock/vsock_uring_test.c
>@@ -66,7 +66,7 @@ static void vsock_io_uring_client(const struct test_opts *opts,
> 	struct msghdr msg;
> 	int fd;
>
>-	fd = vsock_stream_connect(opts->peer_cid, 1234);
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
> 	if (fd < 0) {
> 		perror("connect");
> 		exit(EXIT_FAILURE);
>@@ -120,7 +120,7 @@ static void vsock_io_uring_server(const struct test_opts *opts,
> 	void *data;
> 	int fd;
>
>-	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
> 	if (fd < 0) {
> 		perror("accept");
> 		exit(EXIT_FAILURE);
>@@ -247,6 +247,11 @@ static const struct option longopts[] = {
> 		.has_arg = required_argument,
> 		.val = 'p',
> 	},
>+	{
>+		.name = "peer-port",
>+		.has_arg = required_argument,
>+		.val = 'q',
>+	},
> 	{
> 		.name = "help",
> 		.has_arg = no_argument,
>@@ -257,7 +262,7 @@ static const struct option longopts[] = {
>
> static void usage(void)
> {
>-	fprintf(stderr, "Usage: vsock_uring_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid>\n"
>+	fprintf(stderr, "Usage: vsock_uring_test [--help] [--control-host=<host>] --control-port=<port> --mode=client|server --peer-cid=<cid> [--peer-port=<port>]\n"
> 		"\n"
> 		"  Server: vsock_uring_test --control-port=1234 --mode=server --peer-cid=3\n"
> 		"  Client: vsock_uring_test --control-host=192.168.0.1 --control-port=1234 --mode=client --peer-cid=2\n"
>@@ -271,6 +276,7 @@ static void usage(void)
> 		"  --control-port <port>  Server port to listen on/connect to\n"
> 		"  --mode client|server   Server or client mode\n"
> 		"  --peer-cid <cid>       CID of the other side\n"
>+		"  --peer-port <port>     Port of the other side\n"

Ditto (the default and rewording).

> 		);
> 	exit(EXIT_FAILURE);
> }
>@@ -282,6 +288,7 @@ int main(int argc, char **argv)
> 	struct test_opts opts = {
> 		.mode = TEST_MODE_UNSET,
> 		.peer_cid = VMADDR_CID_ANY,
>+		.peer_port = DEFAULT_PEER_PORT

Ditto (the comma).

> 	};
>
> 	init_signals();
>@@ -309,6 +316,9 @@ int main(int argc, char **argv)
> 		case 'p':
> 			opts.peer_cid = parse_cid(optarg);
> 			break;
>+		case 'q':
>+			opts.peer_port = parse_port(optarg);
>+			break;
> 		case 'P':
> 			control_port = optarg;
> 			break;
>-- 
>2.25.1
>

The rest LGTM, I think you can send the next version without RFC,
targeting net-next.

Thanks,
Stefano