linux-kernel - Re: [PATCH net 2/2] vsock/test: Test setting SO

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Message-ID: <aUpualKwJbT9W1ia@sgarzare-redhat>
Date: Tue, 23 Dec 2025 11:27:35 +0100
From: Stefano Garzarella <sgarzare@...hat.com>
To: Michal Luczaj <mhal@...x.co>
Cc: "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, 
	Arseniy Krasnov <avkrasnov@...utedevices.com>, virtualization@...ts.linux.dev, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 2/2] vsock/test: Test setting SO_ZEROCOPY on
 accept()ed socket

On Tue, Dec 23, 2025 at 10:15:29AM +0100, Michal Luczaj wrote:
>Make sure setsockopt(SOL_SOCKET, SO_ZEROCOPY) on an accept()ed socket is
>handled by vsock's implementation.
>
>Signed-off-by: Michal Luczaj <mhal@...x.co>
>---
> tools/testing/vsock/vsock_test.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
>diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
>index 9e1250790f33..8ec8f0844e22 100644
>--- a/tools/testing/vsock/vsock_test.c
>+++ b/tools/testing/vsock/vsock_test.c
>@@ -2192,6 +2192,34 @@ static void test_stream_nolinger_server(const struct test_opts *opts)
> 	close(fd);
> }
>
>+static void test_stream_accepted_setsockopt_client(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
>+	if (fd < 0) {
>+		perror("connect");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	vsock_wait_remote_close(fd);
>+	close(fd);
>+}
>+
>+static void test_stream_accepted_setsockopt_server(const struct test_opts *opts)
>+{
>+	int fd;
>+
>+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
>+	if (fd < 0) {
>+		perror("accept");
>+		exit(EXIT_FAILURE);
>+	}
>+
>+	enable_so_zerocopy_check(fd);

This test is passing on my env also without the patch applied.

Is that expected?

Thanks,
Stefano

>+	close(fd);
>+}
>+
> static struct test_case test_cases[] = {
> 	{
> 		.name = "SOCK_STREAM connection reset",
>@@ -2371,6 +2399,11 @@ static struct test_case test_cases[] = {
> 		.run_client = test_seqpacket_unread_bytes_client,
> 		.run_server = test_seqpacket_unread_bytes_server,
> 	},
>+	{
>+		.name = "SOCK_STREAM accept()ed socket custom setsockopt()",
>+		.run_client = test_stream_accepted_setsockopt_client,
>+		.run_server = test_stream_accepted_setsockopt_server,
>+	},
> 	{},
> };
>
>
>-- 
>2.52.0
>