CCin hyper-v maintainers and list since I have a question about hyperv
transport.
On Tue, Jun 17, 2025 at 12:53:44PM +0800, Xuewei Niu wrote:
Add support for SIOCINQ ioctl, indicating the length of bytes unread in the
socket. The value is obtained from `vsock_stream_has_data()`.
Signed-off-by: Xuewei Niu <niuxuewei.nxw@xxxxxxxxxxxx>
---
net/vmw_vsock/af_vsock.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 2e7a3034e965..bae6b89bb5fb 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1389,6 +1389,28 @@ static int vsock_do_ioctl(struct socket *sock, unsigned int cmd,
vsk = vsock_sk(sk);
switch (cmd) {
+ case SIOCINQ: {
+ ssize_t n_bytes;
+
+ if (!vsk->transport) {
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ if (sock_type_connectible(sk->sk_type) &&
+ sk->sk_state == TCP_LISTEN) {
+ ret = -EINVAL;
+ break;
+ }
+
+ n_bytes = vsock_stream_has_data(vsk);
Now looks better to me, I just checked transports: vmci and virtio/vhost
returns what we want, but for hyperv we have:
static s64 hvs_stream_has_data(struct vsock_sock *vsk)
{
struct hvsock *hvs = vsk->trans;
s64 ret;
if (hvs->recv_data_len > 0)
return 1;
@Hyper-v maintainers: do you know why we don't return `recv_data_len`?
Do you think we can do that to support this new feature?
Thanks,
Stefano
+ if (n_bytes < 0) {
+ ret = n_bytes;
+ break;
+ }
+ ret = put_user(n_bytes, arg);
+ break;
+ }
case SIOCOUTQ: {
ssize_t n_bytes;
--
2.34.1
