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Subject[RFC PATCH v2 6/8] virtio/vsock: enable zerocopy callback
Date
This adds zerocopy callback for virtio transport.

Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
net/vmw_vsock/virtio_transport.c | 43 ++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)

diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c
index 19909c1e9ba3..2e05b01caa94 100644
--- a/net/vmw_vsock/virtio_transport.c
+++ b/net/vmw_vsock/virtio_transport.c
@@ -64,6 +64,7 @@ struct virtio_vsock {

u32 guest_cid;
bool seqpacket_allow;
+ bool zerocopy_rx_on;
};

static u32 virtio_transport_get_local_cid(void)
@@ -455,6 +456,45 @@ static void virtio_vsock_rx_done(struct virtqueue *vq)

static bool virtio_transport_seqpacket_allow(u32 remote_cid);

+static int
+virtio_transport_zerocopy_set(struct vsock_sock *vsk, bool enable)
+{
+ struct virtio_vsock *vsock;
+
+ rcu_read_lock();
+ vsock = rcu_dereference(the_virtio_vsock);
+
+ if (!vsock) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ vsock->zerocopy_rx_on = enable;
+ rcu_read_unlock();
+
+ return 0;
+}
+
+static int
+virtio_transport_zerocopy_get(struct vsock_sock *vsk)
+{
+ struct virtio_vsock *vsock;
+ bool res;
+
+ rcu_read_lock();
+ vsock = rcu_dereference(the_virtio_vsock);
+
+ if (!vsock) {
+ rcu_read_unlock();
+ return -ENODEV;
+ }
+
+ res = vsock->zerocopy_rx_on;
+ rcu_read_unlock();
+
+ return res;
+}
+
static struct virtio_transport virtio_transport = {
.transport = {
.module = THIS_MODULE,
@@ -480,6 +520,9 @@ static struct virtio_transport virtio_transport = {
.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
.stream_is_active = virtio_transport_stream_is_active,
.stream_allow = virtio_transport_stream_allow,
+ .zerocopy_dequeue = virtio_transport_zerocopy_dequeue,
+ .rx_zerocopy_set = virtio_transport_zerocopy_set,
+ .rx_zerocopy_get = virtio_transport_zerocopy_get,

.seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
.seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
--
2.25.1
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