[Qemu-devel] [PATCH v4 2/5] vhost: reset vhost net when virtio_net_reset happens

[Yuanhan Liu <yuanhan.liu@linux.intel.com>]

When a virtio net driver is unloaded (unbind), virtio_net_reset happens.
For vhost net, we should also send a message (RESET_OWNER) to the backend
to do some proper reset settings.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
---
 hw/net/vhost_net.c      | 20 ++++++++++++++------
 hw/net/virtio-net.c     | 14 ++++++++++++++
 include/net/vhost_net.h |  1 +
 3 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index d91b7b1..387f851 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -292,12 +292,6 @@ static void vhost_net_stop_one(struct vhost_net *net,
             int r = vhost_ops->vhost_net_set_backend(&net->dev, &file);
             assert(r >= 0);
         }
-    } else if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
-        for (file.index = 0; file.index < net->dev.nvqs; ++file.index) {
-            const VhostOps *vhost_ops = net->dev.vhost_ops;
-            int r = vhost_ops->vhost_reset_device(&net->dev);
-            assert(r >= 0);
-        }
     }
     if (net->nc->info->poll) {
         net->nc->info->poll(net->nc, true);
@@ -382,6 +376,16 @@ void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
     assert(vhost_net_set_vnet_endian(dev, ncs[0].peer, false) >= 0);
 }
 
+void vhost_net_reset(VirtIODevice *vdev)
+{
+    VirtIONet *n = VIRTIO_NET(vdev);
+    struct vhost_net *net = get_vhost_net(n->nic->ncs[0].peer);
+
+    if (net->nc->info->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER) {
+        net->dev.vhost_ops->vhost_reset_device(&net->dev);
+    }
+}
+
 void vhost_net_cleanup(struct vhost_net *net)
 {
     vhost_dev_cleanup(&net->dev);
@@ -469,6 +473,10 @@ void vhost_net_stop(VirtIODevice *dev,
 {
 }
 
+void vhost_net_reset(VirtIODevice *vdev)
+{
+}
+
 void vhost_net_cleanup(struct vhost_net *net)
 {
 }
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index a877614..75472ba 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -318,10 +318,24 @@ static RxFilterInfo *virtio_net_query_rxfilter(NetClientState *nc)
     return info;
 }
 
+static void virtio_net_vhost_reset(VirtIONet *n)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(n);
+    NetClientState *nc = qemu_get_queue(n->nic);
+
+    if (!get_vhost_net(nc->peer)) {
+        return;
+    }
+
+    vhost_net_reset(vdev);
+}
+
 static void virtio_net_reset(VirtIODevice *vdev)
 {
     VirtIONet *n = VIRTIO_NET(vdev);
 
+    virtio_net_vhost_reset(n);
+
     /* Reset back to compatibility mode */
     n->promisc = 1;
     n->allmulti = 0;
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index 3389b41..d1c1331 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -18,6 +18,7 @@ struct vhost_net *vhost_net_init(VhostNetOptions *options);
 
 int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, int total_queues);
 void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs, int total_queues);
+void vhost_net_reset(VirtIODevice *dev);
 
 void vhost_net_cleanup(VHostNetState *net);
 
-- 
1.9.0