linux-kernel - [RFC PATCH v3 3/4] test/vsock: add big message test

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Message-ID: <08643a80-d8fd-7f7f-78ec-1962f1dcdd25@sberdevices.ru>
Date:   Sun, 4 Dec 2022 19:22:30 +0000
From:   Arseniy Krasnov <AVKrasnov@...rdevices.ru>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC:     Bobby Eshleman <bobby.eshleman@...edance.com>,
        Krasnov Arseniy <oxffffaa@...il.com>,
        Arseniy Krasnov <AVKrasnov@...rdevices.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        kernel <kernel@...rdevices.ru>
Subject: [RFC PATCH v3 3/4] test/vsock: add big message test

This adds test for sending message, bigger than peer's buffer size.
For SOCK_SEQPACKET socket it must fail, as this type of socket has
message size limit.

Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>
---
 tools/testing/vsock/vsock_test.c | 69 ++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index a5904ee39e91..c4db6c9d2273 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -569,6 +569,70 @@ static void test_seqpacket_timeout_server(const struct test_opts *opts)
 	close(fd);
 }
 
+static void test_seqpacket_bigmsg_client(const struct test_opts *opts)
+{
+	unsigned long sock_buf_size;
+	ssize_t send_size;
+	socklen_t len;
+	void *data;
+	int fd;
+
+	len = sizeof(sock_buf_size);
+
+	fd = vsock_seqpacket_connect(opts->peer_cid, 1234);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	if (getsockopt(fd, AF_VSOCK, SO_VM_SOCKETS_BUFFER_SIZE,
+		       &sock_buf_size, &len)) {
+		perror("getsockopt");
+		exit(EXIT_FAILURE);
+	}
+
+	sock_buf_size++;
+
+	data = malloc(sock_buf_size);
+	if (!data) {
+		perror("malloc");
+		exit(EXIT_FAILURE);
+	}
+
+	send_size = send(fd, data, sock_buf_size, 0);
+	if (send_size != -1) {
+		fprintf(stderr, "expected 'send(2)' failure, got %zi\n",
+			send_size);
+		exit(EXIT_FAILURE);
+	}
+
+	if (errno != EMSGSIZE) {
+		fprintf(stderr, "expected EMSGSIZE in 'errno', got %i\n",
+			errno);
+		exit(EXIT_FAILURE);
+	}
+
+	control_writeln("CLISENT");
+
+	free(data);
+	close(fd);
+}
+
+static void test_seqpacket_bigmsg_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_seqpacket_accept(VMADDR_CID_ANY, 1234, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	control_expectln("CLISENT");
+
+	close(fd);
+}
+
 #define BUF_PATTERN_1 'a'
 #define BUF_PATTERN_2 'b'
 
@@ -851,6 +915,11 @@ static struct test_case test_cases[] = {
 		.run_client = test_stream_poll_rcvlowat_client,
 		.run_server = test_stream_poll_rcvlowat_server,
 	},
+	{
+		.name = "SOCK_SEQPACKET big message",
+		.run_client = test_seqpacket_bigmsg_client,
+		.run_server = test_seqpacket_bigmsg_server,
+	},
 	{},
 };
 
-- 
2.25.1