linux-kernel - Re: [RFC PATCH v2 3/3] test/vsock: new skbuff appending test

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Date:   Tue, 28 Mar 2023 11:30:51 +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>,
        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 3/3] test/vsock: new skbuff appending test

On Sun, Mar 26, 2023 at 01:10:16AM +0300, Arseniy Krasnov wrote:
>This adds test which checks case when data of newly received skbuff is
>appended to the last skbuff in the socket's queue. It looks like simple
>test with 'send()' and 'recv()', but internally it triggers logic which
>appends one received skbuff to another. Test checks that this feature
>works correctly.
>
>This test is actual only for virtio transport.
>
>Signed-off-by: Arseniy Krasnov <AVKrasnov@...rdevices.ru>
>---
> tools/testing/vsock/vsock_test.c | 90 ++++++++++++++++++++++++++++++++
> 1 file changed, 90 insertions(+)

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

>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 3de10dbb50f5..12b97c92fbb2 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -968,6 +968,91 @@ static void test_seqpacket_inv_buf_server(const struct test_opts *opts)
> 	test_inv_buf_server(opts, false);
> }
>
>+#define HELLO_STR "HELLO"
>+#define WORLD_STR "WORLD"
>+
>+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);
>+	if (fd < 0) {
>+		perror("connect");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	/* 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);
>+	}
>+
>+	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);
>+	}
>+
>+	control_writeln("SEND1");
>+	/* Peer reads merged skbuff packet. */
>+	control_expectln("REPLY1");
>+
>+	close(fd);
>+}
>+
>+static void test_stream_virtio_skb_merge_server(const struct test_opts *opts)
>+{
>+	unsigned char buf[64];
>+	ssize_t res;
>+	int fd;
>+
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, 1234, NULL);
>+	if (fd < 0) {
>+		perror("accept");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	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);
>+	}
>+
>+	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);
>+	}
>+
>+	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);
>+	}
>+
>+	if (memcmp(buf, HELLO_STR WORLD_STR, strlen(HELLO_STR WORLD_STR))) {
>+		fprintf(stderr, "pattern mismatch\n");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	control_writeln("REPLY1");
>+
>+	close(fd);
>+}
>+
> static struct test_case test_cases[] = {
> 	{
> 		.name = "SOCK_STREAM connection reset",
>@@ -1038,6 +1123,11 @@ static struct test_case test_cases[] = {
> 		.run_client = test_seqpacket_inv_buf_client,
> 		.run_server = test_seqpacket_inv_buf_server,
> 	},
>+	{
>+		.name = "SOCK_STREAM virtio skb merge",
>+		.run_client = test_stream_virtio_skb_merge_client,
>+		.run_server = test_stream_virtio_skb_merge_server,
>+	},
> 	{},
> };
>
>-- 
>2.25.1
>