netdev - [PATCH net-next 5/5] vsock/test: track bytes in MSG_PEEK test for SOCK

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Date: Fri, 15 Sep 2023 14:14:52 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Stefano Garzarella <sgarzare@...hat.com>,
	Arseniy Krasnov <avkrasnov@...utedevices.com>,
	virtualization@...ts.linux-foundation.org,
	oxffffaa@...il.com,
	Bobby Eshleman <bobby.eshleman@...edance.com>
Subject: [PATCH net-next 5/5] vsock/test: track bytes in MSG_PEEK test for SOCK_SEQPACKET

The test was a bit complicated to read.
Added variables to keep track of the bytes read and to be read
in each step. Also some comments.

The test is unchanged.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 tools/testing/vsock/vsock_test.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index b18acbaf92e2..5743dcae2350 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -1002,6 +1002,7 @@ static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
 
 static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
 {
+	size_t read = 0, to_read;
 	unsigned char buf[64];
 	int fd;
 
@@ -1014,14 +1015,21 @@ static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
 	control_expectln("SEND0");
 
 	/* Read skbuff partially. */
-	recv_buf(fd, buf, 2, 0, 2);
+	to_read = 2;
+	recv_buf(fd, buf + read, to_read, 0, to_read);
+	read += to_read;
 
 	control_writeln("REPLY0");
 	control_expectln("SEND1");
 
-	recv_buf(fd, buf + 2, 8, 0, 8);
+	/* Read the rest of both buffers */
+	to_read = strlen(HELLO_STR WORLD_STR) - read;
+	recv_buf(fd, buf + read, to_read, 0, to_read);
+	read += to_read;
 
-	recv_buf(fd, buf, sizeof(buf) - 8 - 2, MSG_DONTWAIT, -EAGAIN);
+	/* No more bytes should be there */
+	to_read = sizeof(buf) - read;
+	recv_buf(fd, buf + read, to_read, MSG_DONTWAIT, -EAGAIN);
 
 	if (memcmp(buf, HELLO_STR WORLD_STR, strlen(HELLO_STR WORLD_STR))) {
 		fprintf(stderr, "pattern mismatch\n");
-- 
2.41.0