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Date:   Thu, 1 Dec 2022 10:45:41 +0100
From:   Stefano Garzarella <sgarzare@redhat.com>
To:     Arseniy Krasnov <AVKrasnov@sberdevices.ru>
Cc:     "David S. Miller" <davem@davemloft.net>,
        "edumazet@google.com" <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        "kys@microsoft.com" <kys@microsoft.com>,
        "haiyangz@microsoft.com" <haiyangz@microsoft.com>,
        "wei.liu@kernel.org" <wei.liu@kernel.org>,
        Dexuan Cui <decui@microsoft.com>,
        Bryan Tan <bryantan@vmware.com>,
        Vishnu Dasa <vdasa@vmware.com>,
        Krasnov Arseniy <oxffffaa@gmail.com>,
        Bobby Eshleman <bobby.eshleman@gmail.com>,
        Bobby Eshleman <bobby.eshleman@bytedance.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "virtualization@lists.linux-foundation.org" 
        <virtualization@lists.linux-foundation.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        kernel <kernel@sberdevices.ru>
Subject: Re: [RFC PATCH v2 5/6] test/vsock: add big message test
Message-ID: <20221201094541.gj7zthelbeqhsp63@sgarzare-redhat>
References: <9d96f6c6-1d4f-8197-b3bc-8957124c8933@sberdevices.ru>
 <2634ad7f-b462-5c69-8aa1-2f200a6beb20@sberdevices.ru>
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On Fri, Nov 25, 2022 at 05:13:06PM +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@sberdevices.ru>
>---
> tools/testing/vsock/vsock_test.c | 69 ++++++++++++++++++++++++++++++++
> 1 file changed, 69 insertions(+)
>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 12ef0cca6f93..a8e43424fb32 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -569,6 +569,70 @@ 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);
>+	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) {
>+		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);
>+	}

We should make sure that this is true for all transports, but since now 
only virtio-vsock supports it, we should be okay.

>+
>+	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'
>
>@@ -851,6 +915,11 @@ static struct test_case test_cases[] = {
> 		.run_client = test_stream_poll_rcvlowat_client,
> 		.run_server = test_stream_poll_rcvlowat_server,
> 	},
>+	{
>+		.name = "SOCK_SEQPACKET big message",
>+		.run_client = test_seqpacket_bigmsg_client,
>+		.run_server = test_seqpacket_bigmsg_server,
>+	},
> 	{},
> };
>
>-- 
>2.25.1

LGTM!

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