vsock: return errors other than -ENOMEM to socket

This commit allows vsock implementations to return errors
to the socket layer other than -ENOMEM. One immediate effect
of this is that upon the sk_sndbuf threshold being reached -EAGAIN
will be returned and userspace may throttle appropriately.

Resultingly, a known issue with uperf is resolved[1].

Additionally, to preserve legacy behavior for non-virtio
implementations, hyperv/vmci force errors to be -ENOMEM so that behavior
is unchanged.

[1]: https://gitlab.com/vsock/vsock/-/issues/1

Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>

include/linux/virtio_vsock.h

@@ -8,6 +8,9 @@
 #include <net/sock.h>
 #include <net/af_vsock.h>
 
+/* Threshold for detecting small packets to copy */
+#define GOOD_COPY_LEN  128
+
 enum virtio_vsock_metadata_flags {
 	VIRTIO_VSOCK_METADATA_FLAGS_REPLY		= BIT(0),
 	VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED	= BIT(1),

net/vmw_vsock/af_vsock.c

@@ -1852,8 +1852,9 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg,
 			written = transport->stream_enqueue(vsk,
 					msg, len - total_written);
 		}
+
 		if (written < 0) {
-			err = -ENOMEM;
+			err = written;
 			goto out_err;
 		}
 

net/vmw_vsock/hyperv_transport.c

@@ -687,7 +687,7 @@ static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg,
 	if (bytes_written)
 		ret = bytes_written;
 	kfree(send_buf);
-	return ret;
+	return ret < 0 ? -ENOMEM : ret;
 }
 
 static s64 hvs_stream_has_data(struct vsock_sock *vsk)

net/vmw_vsock/virtio_transport_common.c

@@ -23,9 +23,6 @@
 /* How long to wait for graceful shutdown of a connection */
 #define VSOCK_CLOSE_TIMEOUT (8 * HZ)
 
-/* Threshold for detecting small packets to copy */
-#define GOOD_COPY_LEN  128
-
 static const struct virtio_transport *
 virtio_transport_get_ops(struct vsock_sock *vsk)
 {

net/vmw_vsock/vmci_transport.c

@@ -1838,7 +1838,14 @@ static ssize_t vmci_transport_stream_enqueue(
 	struct msghdr *msg,
 	size_t len)
 {
-	return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
+	int err;
+
+	err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0);
+
+	if (err < 0)
+		err = -ENOMEM;
+
+	return err;
 }
 
 static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk)