netdev - Re: [RFC PATCH v1 2/3] test/vsock: add big message test

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Date:   Mon, 21 Nov 2022 15:52:48 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Arseniy Krasnov <AVKrasnov@...rdevices.ru>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        kernel <kernel@...rdevices.ru>,
        Bobby Eshleman <bobby.eshleman@...il.com>,
        Krasnov Arseniy <oxffffaa@...il.com>
Subject: Re: [RFC PATCH v1 2/3] test/vsock: add big message test

On Tue, Nov 15, 2022 at 08:52:35PM +0000, Arseniy Krasnov wrote:
>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>
>---
> tools/testing/vsock/vsock_test.c | 62 ++++++++++++++++++++++++++++++++
> 1 file changed, 62 insertions(+)
>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 107c11165887..bb4e8657f1d6 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -560,6 +560,63 @@ 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);

Not for this patch, but someday we should add a macro for this port and 
maybe even make it configurable :-)

>+	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) {

Can we check also `errno`?
IIUC it should contains EMSGSIZE.

>+		fprintf(stderr, "expected 'send(2)' failure, got %zi\n",
>+			send_size);
>+	}
>+
>+	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'
>
>@@ -832,6 +889,11 @@ static struct test_case test_cases[] = {
> 		.run_client = test_seqpacket_timeout_client,
> 		.run_server = test_seqpacket_timeout_server,
> 	},
>+	{
>+		.name = "SOCK_SEQPACKET big message",
>+		.run_client = test_seqpacket_bigmsg_client,
>+		.run_server = test_seqpacket_bigmsg_server,
>+	},

I would add new tests always at the end, so if some CI uses --skip, we 
don't have to update the scripts to skip some tests.

> 	{
> 		.name = "SOCK_SEQPACKET invalid receive buffer",
> 		.run_client = test_seqpacket_invalid_rec_buffer_client,
>-- 
>2.25.1