diff --git a/tools/testing/vsock/util.c b/tools/testing/vsock/util.c
index 01b636d3039a..6779d5008b27 100644
--- a/tools/testing/vsock/util.c
+++ b/tools/testing/vsock/util.c
@@ -211,6 +211,111 @@ int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
 	return vsock_accept(cid, port, clientaddrp, SOCK_SEQPACKET);
 }
 
+/* Transmit bytes from a buffer and check the return value.
+ *
+ * expected_ret:
+ *  <0 Negative errno (for testing errors)
+ *   0 End-of-file
+ *  >0 Success (bytes successfully written)
+ */
+void send_buf(int fd, const void *buf, size_t len, int flags,
+	      ssize_t expected_ret)
+{
+	ssize_t nwritten = 0;
+	ssize_t ret;
+
+	timeout_begin(TIMEOUT);
+	do {
+		ret = send(fd, buf + nwritten, len - nwritten, flags);
+		timeout_check("send");
+
+		if (ret == 0 || (ret < 0 && errno != EINTR))
+			break;
+
+		nwritten += ret;
+	} while (nwritten < len);
+	timeout_end();
+
+	if (expected_ret < 0) {
+		if (ret != -1) {
+			fprintf(stderr, "bogus send(2) return value %zd (expected %zd)\n",
+				ret, expected_ret);
+			exit(EXIT_FAILURE);
+		}
+		if (errno != -expected_ret) {
+			perror("send");
+			exit(EXIT_FAILURE);
+		}
+		return;
+	}
+
+	if (ret < 0) {
+		perror("send");
+		exit(EXIT_FAILURE);
+	}
+
+	if (nwritten != expected_ret) {
+		if (ret == 0)
+			fprintf(stderr, "unexpected EOF while sending bytes\n");
+
+		fprintf(stderr, "bogus send(2) bytes written %zd (expected %zd)\n",
+			nwritten, expected_ret);
+		exit(EXIT_FAILURE);
+	}
+}
+
+/* Receive bytes in a buffer and check the return value.
+ *
+ * expected_ret:
+ *  <0 Negative errno (for testing errors)
+ *   0 End-of-file
+ *  >0 Success (bytes successfully read)
+ */
+void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret)
+{
+	ssize_t nread = 0;
+	ssize_t ret;
+
+	timeout_begin(TIMEOUT);
+	do {
+		ret = recv(fd, buf + nread, len - nread, flags);
+		timeout_check("recv");
+
+		if (ret == 0 || (ret < 0 && errno != EINTR))
+			break;
+
+		nread += ret;
+	} while (nread < len);
+	timeout_end();
+
+	if (expected_ret < 0) {
+		if (ret != -1) {
+			fprintf(stderr, "bogus recv(2) return value %zd (expected %zd)\n",
+				ret, expected_ret);
+			exit(EXIT_FAILURE);
+		}
+		if (errno != -expected_ret) {
+			perror("recv");
+			exit(EXIT_FAILURE);
+		}
+		return;
+	}
+
+	if (ret < 0) {
+		perror("recv");
+		exit(EXIT_FAILURE);
+	}
+
+	if (nread != expected_ret) {
+		if (ret == 0)
+			fprintf(stderr, "unexpected EOF while receiving bytes\n");
+
+		fprintf(stderr, "bogus recv(2) bytes read %zd (expected %zd)\n",
+			nread, expected_ret);
+		exit(EXIT_FAILURE);
+	}
+}
+
 /* Transmit one byte and check the return value.
  *
  * expected_ret:
@@ -221,43 +326,8 @@ int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
 void send_byte(int fd, int expected_ret, int flags)
 {
 	const uint8_t byte = 'A';
-	ssize_t nwritten;
 
-	timeout_begin(TIMEOUT);
-	do {
-		nwritten = send(fd, &byte, sizeof(byte), flags);
-		timeout_check("write");
-	} while (nwritten < 0 && errno == EINTR);
-	timeout_end();
-
-	if (expected_ret < 0) {
-		if (nwritten != -1) {
-			fprintf(stderr, "bogus send(2) return value %zd\n",
-				nwritten);
-			exit(EXIT_FAILURE);
-		}
-		if (errno != -expected_ret) {
-			perror("write");
-			exit(EXIT_FAILURE);
-		}
-		return;
-	}
-
-	if (nwritten < 0) {
-		perror("write");
-		exit(EXIT_FAILURE);
-	}
-	if (nwritten == 0) {
-		if (expected_ret == 0)
-			return;
-
-		fprintf(stderr, "unexpected EOF while sending byte\n");
-		exit(EXIT_FAILURE);
-	}
-	if (nwritten != sizeof(byte)) {
-		fprintf(stderr, "bogus send(2) return value %zd\n", nwritten);
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, &byte, sizeof(byte), flags, expected_ret);
 }
 
 /* Receive one byte and check the return value.
@@ -270,43 +340,9 @@ void send_byte(int fd, int expected_ret, int flags)
 void recv_byte(int fd, int expected_ret, int flags)
 {
 	uint8_t byte;
-	ssize_t nread;
 
-	timeout_begin(TIMEOUT);
-	do {
-		nread = recv(fd, &byte, sizeof(byte), flags);
-		timeout_check("read");
-	} while (nread < 0 && errno == EINTR);
-	timeout_end();
+	recv_buf(fd, &byte, sizeof(byte), flags, expected_ret);
 
-	if (expected_ret < 0) {
-		if (nread != -1) {
-			fprintf(stderr, "bogus recv(2) return value %zd\n",
-				nread);
-			exit(EXIT_FAILURE);
-		}
-		if (errno != -expected_ret) {
-			perror("read");
-			exit(EXIT_FAILURE);
-		}
-		return;
-	}
-
-	if (nread < 0) {
-		perror("read");
-		exit(EXIT_FAILURE);
-	}
-	if (nread == 0) {
-		if (expected_ret == 0)
-			return;
-
-		fprintf(stderr, "unexpected EOF while receiving byte\n");
-		exit(EXIT_FAILURE);
-	}
-	if (nread != sizeof(byte)) {
-		fprintf(stderr, "bogus recv(2) return value %zd\n", nread);
-		exit(EXIT_FAILURE);
-	}
 	if (byte != 'A') {
 		fprintf(stderr, "unexpected byte read %c\n", byte);
 		exit(EXIT_FAILURE);
diff --git a/tools/testing/vsock/util.h b/tools/testing/vsock/util.h
index fb99208a95ea..e5407677ce05 100644
--- a/tools/testing/vsock/util.h
+++ b/tools/testing/vsock/util.h
@@ -42,6 +42,9 @@ int vsock_stream_accept(unsigned int cid, unsigned int port,
 int vsock_seqpacket_accept(unsigned int cid, unsigned int port,
 			   struct sockaddr_vm *clientaddrp);
 void vsock_wait_remote_close(int fd);
+void send_buf(int fd, const void *buf, size_t len, int flags,
+	      ssize_t expected_ret);
+void recv_buf(int fd, void *buf, size_t len, int flags, ssize_t expected_ret);
 void send_byte(int fd, int expected_ret, int flags);
 void recv_byte(int fd, int expected_ret, int flags);
 void run_tests(const struct test_case *test_cases,
diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 148fc9c47c50..da4cb819a183 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -262,7 +262,6 @@ static void test_msg_peek_client(const struct test_opts *opts,
 				 bool seqpacket)
 {
 	unsigned char buf[MSG_PEEK_BUF_LEN];
-	ssize_t send_size;
 	int fd;
 	int i;
 
@@ -281,17 +280,7 @@ static void test_msg_peek_client(const struct test_opts *opts,
 
 	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);
-	}
+	send_buf(fd, buf, sizeof(buf), 0, sizeof(buf));
 
 	close(fd);
 }
@@ -302,7 +291,6 @@ static void test_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;
 
 	if (seqpacket)
@@ -316,34 +304,16 @@ static void test_msg_peek_server(const struct test_opts *opts,
 	}
 
 	/* 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);
-	}
+	recv_buf(fd, buf_peek, sizeof(buf_peek), MSG_PEEK | MSG_DONTWAIT,
+		 -EAGAIN);
 
 	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);
-	}
+	recv_buf(fd, buf_half, sizeof(buf_half), MSG_PEEK, sizeof(buf_half));
 
 	/* 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);
-	}
+	recv_buf(fd, buf_peek, sizeof(buf_peek), MSG_PEEK, sizeof(buf_peek));
 
 	/* Compare partial and full peek. */
 	if (memcmp(buf_half, buf_peek, sizeof(buf_half))) {
@@ -356,22 +326,11 @@ static void test_msg_peek_server(const struct test_opts *opts,
 		 * so check it with MSG_PEEK. We must get length
 		 * of the message.
 		 */
-		res = recv(fd, buf_half, sizeof(buf_half), MSG_PEEK |
-			   MSG_TRUNC);
-		if (res != sizeof(buf_peek)) {
-			fprintf(stderr,
-				"recv(2) + MSG_PEEK | MSG_TRUNC, exp %zu, got %zi\n",
-				sizeof(buf_half), res);
-			exit(EXIT_FAILURE);
-		}
+		recv_buf(fd, buf_half, sizeof(buf_half), MSG_PEEK | MSG_TRUNC,
+			 sizeof(buf_peek));
 	}
 
-	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);
-	}
+	recv_buf(fd, buf_normal, sizeof(buf_normal), 0, sizeof(buf_normal));
 
 	/* Compare full peek and normal read. */
 	if (memcmp(buf_peek, buf_normal, sizeof(buf_peek))) {
@@ -416,7 +375,6 @@ static void test_seqpacket_msg_bounds_client(const struct test_opts *opts)
 	msg_count = SOCK_BUF_SIZE / MAX_MSG_SIZE;
 
 	for (int i = 0; i < msg_count; i++) {
-		ssize_t send_size;
 		size_t buf_size;
 		int flags;
 		void *buf;
@@ -444,17 +402,7 @@ static void test_seqpacket_msg_bounds_client(const struct test_opts *opts)
 			flags = 0;
 		}
 
-		send_size = send(fd, buf, buf_size, flags);
-
-		if (send_size < 0) {
-			perror("send");
-			exit(EXIT_FAILURE);
-		}
-
-		if (send_size != buf_size) {
-			fprintf(stderr, "Invalid send size\n");
-			exit(EXIT_FAILURE);
-		}
+		send_buf(fd, buf, buf_size, flags, buf_size);
 
 		/*
 		 * Hash sum is computed at both client and server in
@@ -555,10 +503,7 @@ static void test_seqpacket_msg_trunc_client(const struct test_opts *opts)
 		exit(EXIT_FAILURE);
 	}
 
-	if (send(fd, buf, sizeof(buf), 0) != sizeof(buf)) {
-		perror("send failed");
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, buf, sizeof(buf), 0, sizeof(buf));
 
 	control_writeln("SENDDONE");
 	close(fd);
@@ -680,7 +625,6 @@ static void test_seqpacket_timeout_server(const struct test_opts *opts)
 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;
@@ -707,18 +651,7 @@ static void test_seqpacket_bigmsg_client(const struct test_opts *opts)
 		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);
-	}
+	send_buf(fd, data, sock_buf_size, 0, -EMSGSIZE);
 
 	control_writeln("CLISENT");
 
@@ -772,15 +705,9 @@ static void test_seqpacket_invalid_rec_buffer_client(const struct test_opts *opt
 	memset(buf1, BUF_PATTERN_1, buf_size);
 	memset(buf2, BUF_PATTERN_2, buf_size);
 
-	if (send(fd, buf1, buf_size, 0) != buf_size) {
-		perror("send failed");
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, buf1, buf_size, 0, buf_size);
 
-	if (send(fd, buf2, buf_size, 0) != buf_size) {
-		perror("send failed");
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, buf2, buf_size, 0, buf_size);
 
 	close(fd);
 }
@@ -901,7 +828,6 @@ static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
 	unsigned long lowat_val = RCVLOWAT_BUF_SIZE;
 	char buf[RCVLOWAT_BUF_SIZE];
 	struct pollfd fds;
-	ssize_t read_res;
 	short poll_flags;
 	int fd;
 
@@ -956,12 +882,7 @@ static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
 	/* Use MSG_DONTWAIT, if call is going to wait, EAGAIN
 	 * will be returned.
 	 */
-	read_res = recv(fd, buf, sizeof(buf), MSG_DONTWAIT);
-	if (read_res != RCVLOWAT_BUF_SIZE) {
-		fprintf(stderr, "Unexpected recv result %zi\n",
-			read_res);
-		exit(EXIT_FAILURE);
-	}
+	recv_buf(fd, buf, sizeof(buf), MSG_DONTWAIT, RCVLOWAT_BUF_SIZE);
 
 	control_writeln("POLLDONE");
 
@@ -973,7 +894,7 @@ static void test_stream_poll_rcvlowat_client(const struct test_opts *opts)
 static void test_inv_buf_client(const struct test_opts *opts, bool stream)
 {
 	unsigned char data[INV_BUF_TEST_DATA_LEN] = {0};
-	ssize_t ret;
+	ssize_t expected_ret;
 	int fd;
 
 	if (stream)
@@ -989,39 +910,18 @@ static void test_inv_buf_client(const struct test_opts *opts, bool stream)
 	control_expectln("SENDDONE");
 
 	/* Use invalid buffer here. */
-	ret = recv(fd, NULL, sizeof(data), 0);
-	if (ret != -1) {
-		fprintf(stderr, "expected recv(2) failure, got %zi\n", ret);
-		exit(EXIT_FAILURE);
-	}
-
-	if (errno != EFAULT) {
-		fprintf(stderr, "unexpected recv(2) errno %d\n", errno);
-		exit(EXIT_FAILURE);
-	}
-
-	ret = recv(fd, data, sizeof(data), MSG_DONTWAIT);
+	recv_buf(fd, NULL, sizeof(data), 0, -EFAULT);
 
 	if (stream) {
 		/* For SOCK_STREAM we must continue reading. */
-		if (ret != sizeof(data)) {
-			fprintf(stderr, "expected recv(2) success, got %zi\n", ret);
-			exit(EXIT_FAILURE);
-		}
-		/* Don't check errno in case of success. */
+		expected_ret = sizeof(data);
 	} else {
 		/* For SOCK_SEQPACKET socket's queue must be empty. */
-		if (ret != -1) {
-			fprintf(stderr, "expected recv(2) failure, got %zi\n", ret);
-			exit(EXIT_FAILURE);
-		}
-
-		if (errno != EAGAIN) {
-			fprintf(stderr, "unexpected recv(2) errno %d\n", errno);
-			exit(EXIT_FAILURE);
-		}
+		expected_ret = -EAGAIN;
 	}
 
+	recv_buf(fd, data, sizeof(data), MSG_DONTWAIT, expected_ret);
+
 	control_writeln("DONE");
 
 	close(fd);
@@ -1030,7 +930,6 @@ static void test_inv_buf_client(const struct test_opts *opts, bool stream)
 static void test_inv_buf_server(const struct test_opts *opts, bool stream)
 {
 	unsigned char data[INV_BUF_TEST_DATA_LEN] = {0};
-	ssize_t res;
 	int fd;
 
 	if (stream)
@@ -1043,11 +942,7 @@ static void test_inv_buf_server(const struct test_opts *opts, bool stream)
 		exit(EXIT_FAILURE);
 	}
 
-	res = send(fd, data, sizeof(data), 0);
-	if (res != sizeof(data)) {
-		fprintf(stderr, "unexpected send(2) result %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, data, sizeof(data), 0, sizeof(data));
 
 	control_writeln("SENDDONE");
 
@@ -1081,7 +976,6 @@ static void test_seqpacket_inv_buf_server(const struct test_opts *opts)
 
 static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
 {
-	ssize_t res;
 	int fd;
 
 	fd = vsock_stream_connect(opts->peer_cid, 1234);
@@ -1091,22 +985,14 @@ static void test_stream_virtio_skb_merge_client(const struct test_opts *opts)
 	}
 
 	/* Send first skbuff. */
-	res = send(fd, HELLO_STR, strlen(HELLO_STR), 0);
-	if (res != strlen(HELLO_STR)) {
-		fprintf(stderr, "unexpected send(2) result %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, HELLO_STR, strlen(HELLO_STR), 0, strlen(HELLO_STR));
 
 	control_writeln("SEND0");
 	/* Peer reads part of first skbuff. */
 	control_expectln("REPLY0");
 
 	/* Send second skbuff, it will be appended to the first. */
-	res = send(fd, WORLD_STR, strlen(WORLD_STR), 0);
-	if (res != strlen(WORLD_STR)) {
-		fprintf(stderr, "unexpected send(2) result %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	send_buf(fd, WORLD_STR, strlen(WORLD_STR), 0, strlen(WORLD_STR));
 
 	control_writeln("SEND1");
 	/* Peer reads merged skbuff packet. */
@@ -1117,8 +1003,8 @@ 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];
-	ssize_t res;
 	int fd;
 
 	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
@@ -1130,26 +1016,21 @@ static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
 	control_expectln("SEND0");
 
 	/* Read skbuff partially. */
-	res = recv(fd, buf, 2, 0);
-	if (res != 2) {
-		fprintf(stderr, "expected recv(2) returns 2 bytes, got %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	to_read = 2;
+	recv_buf(fd, buf + read, to_read, 0, to_read);
+	read += to_read;
 
 	control_writeln("REPLY0");
 	control_expectln("SEND1");
 
-	res = recv(fd, buf + 2, sizeof(buf) - 2, 0);
-	if (res != 8) {
-		fprintf(stderr, "expected recv(2) returns 8 bytes, got %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	/* 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;
 
-	res = recv(fd, buf, sizeof(buf) - 8 - 2, MSG_DONTWAIT);
-	if (res != -1) {
-		fprintf(stderr, "expected recv(2) failure, got %zi\n", res);
-		exit(EXIT_FAILURE);
-	}
+	/* 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");