linux-kernel - Re: [RFC PATCH v2 3/4] vsock/test: rework MSG_PEEK test for SOCK

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Message-ID: <fefl2wuphc73qm26n62mhs3x5qrbirfd5334u3xeblpghgkdq5@h4a2t4nljyoi>
Date:   Tue, 25 Jul 2023 17:39:59 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Bobby Eshleman <bobby.eshleman@...edance.com>,
        kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...rdevices.ru, oxffffaa@...il.com
Subject: Re: [RFC PATCH v2 3/4] vsock/test: rework MSG_PEEK test for
 SOCK_STREAM

On Wed, Jul 19, 2023 at 10:27:07PM +0300, Arseniy Krasnov wrote:
>This new version makes test more complicated by adding empty read,
>partial read and data comparisons between MSG_PEEK and normal reads.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> tools/testing/vsock/vsock_test.c | 78 ++++++++++++++++++++++++++++++--
> 1 file changed, 75 insertions(+), 3 deletions(-)

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>

>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index ac1bd3ac1533..444a3ff0681f 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -255,9 +255,14 @@ static void test_stream_multiconn_server(const struct test_opts *opts)
> 		close(fds[i]);
> }
>
>+#define MSG_PEEK_BUF_LEN 64
>+
> static void test_stream_msg_peek_client(const struct test_opts *opts)
> {
>+	unsigned char buf[MSG_PEEK_BUF_LEN];
>+	ssize_t send_size;
> 	int fd;
>+	int i;
>
> 	fd = vsock_stream_connect(opts->peer_cid, 1234);
> 	if (fd < 0) {
>@@ -265,12 +270,32 @@ static void test_stream_msg_peek_client(const struct test_opts *opts)
> 		exit(EXIT_FAILURE);
> 	}
>
>-	send_byte(fd, 1, 0);
>+	for (i = 0; i < sizeof(buf); i++)
>+		buf[i] = rand() & 0xFF;
>+
>+	control_expectln("SRVREADY");
>+
>+	send_size = send(fd, buf, sizeof(buf), 0);
>+
>+	if (send_size < 0) {
>+		perror("send");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (send_size != sizeof(buf)) {
>+		fprintf(stderr, "Invalid send size %zi\n", send_size);
>+		exit(EXIT_FAILURE);
>+	}
>+
> 	close(fd);
> }
>
> static void test_stream_msg_peek_server(const struct test_opts *opts)
> {
>+	unsigned char buf_half[MSG_PEEK_BUF_LEN / 2];
>+	unsigned char buf_normal[MSG_PEEK_BUF_LEN];
>+	unsigned char buf_peek[MSG_PEEK_BUF_LEN];
>+	ssize_t res;
> 	int fd;
>
> 	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>@@ -279,8 +304,55 @@ static void test_stream_msg_peek_server(const struct test_opts *opts)
> 		exit(EXIT_FAILURE);
> 	}
>
>-	recv_byte(fd, 1, MSG_PEEK);
>-	recv_byte(fd, 1, 0);
>+	/* Peek from empty socket. */
>+	res = recv(fd, buf_peek, sizeof(buf_peek), MSG_PEEK | MSG_DONTWAIT);
>+	if (res != -1) {
>+		fprintf(stderr, "expected recv(2) failure, got %zi\n", res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	if (errno != EAGAIN) {
>+		perror("EAGAIN expected");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	control_writeln("SRVREADY");
>+
>+	/* Peek part of data. */
>+	res = recv(fd, buf_half, sizeof(buf_half), MSG_PEEK);
>+	if (res != sizeof(buf_half)) {
>+		fprintf(stderr, "recv(2) + MSG_PEEK, expected %zu, got %zi\n",
>+			sizeof(buf_half), res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	/* Peek whole data. */
>+	res = recv(fd, buf_peek, sizeof(buf_peek), MSG_PEEK);
>+	if (res != sizeof(buf_peek)) {
>+		fprintf(stderr, "recv(2) + MSG_PEEK, expected %zu, got %zi\n",
>+			sizeof(buf_peek), res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	/* Compare partial and full peek. */
>+	if (memcmp(buf_half, buf_peek, sizeof(buf_half))) {
>+		fprintf(stderr, "Partial peek data mismatch\n");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	res = recv(fd, buf_normal, sizeof(buf_normal), 0);
>+	if (res != sizeof(buf_normal)) {
>+		fprintf(stderr, "recv(2), expected %zu, got %zi\n",
>+			sizeof(buf_normal), res);
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	/* Compare full peek and normal read. */
>+	if (memcmp(buf_peek, buf_normal, sizeof(buf_peek))) {
>+		fprintf(stderr, "Full peek data mismatch\n");
>+		exit(EXIT_FAILURE);
>+	}
>+
> 	close(fd);
> }
>
>-- 
>2.25.1
>