[PATCH 02/12] lib/librte_vhost: add vhost_user private info structure

[Fan Zhang <roy.fan.zhang@intel.com>]

This patch adds a vhost_user_dev_priv structure and a vhost_user
message handler function prototype to vhost_user. This allows
different types of devices to add private information and their
device-specific vhost-user message function handlers to
virtio_net structure. The change to vhost_user_msg_handler is
also added to call the device-specific message handler.

Signed-off-by: Fan Zhang <roy.fan.zhang@intel.com>
---
 lib/librte_vhost/vhost_user.c | 13 ++++++++++++-
 lib/librte_vhost/vhost_user.h |  9 ++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index f4c7ce4..c5ae85f 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1337,7 +1337,18 @@ vhost_user_msg_handler(int vid, int fd)
 		break;
 
 	default:
-		ret = -1;
+		if (!dev->private_data)
+			ret = -1;
+		else {
+			struct vhost_user_dev_priv *priv = dev->private_data;
+
+			if (!priv->vhost_user_msg_handler)
+				ret = -1;
+			else {
+				ret = (*priv->vhost_user_msg_handler)(dev,
+						&msg, fd);
+			}
+		}
 		break;
 
 	}
diff --git a/lib/librte_vhost/vhost_user.h b/lib/librte_vhost/vhost_user.h
index 76d9fe2..990b40a 100644
--- a/lib/librte_vhost/vhost_user.h
+++ b/lib/librte_vhost/vhost_user.h
@@ -81,7 +81,7 @@ typedef enum VhostUserRequest {
 	VHOST_USER_NET_SET_MTU = 20,
 	VHOST_USER_SET_SLAVE_REQ_FD = 21,
 	VHOST_USER_IOTLB_MSG = 22,
-	VHOST_USER_MAX
+	VHOST_USER_MAX = 25
 } VhostUserRequest;
 
 typedef enum VhostUserSlaveRequest {
@@ -137,6 +137,13 @@ typedef struct VhostUserMsg {
 /* The version of the protocol we support */
 #define VHOST_USER_VERSION    0x1
 
+typedef int (*msg_handler)(struct virtio_net *dev, struct VhostUserMsg *msg,
+		int fd);
+
+struct vhost_user_dev_priv {
+	msg_handler vhost_user_msg_handler;
+	char data[0];
+};
 
 /* vhost_user.c */
 int vhost_user_msg_handler(int vid, int fd);
-- 
2.9.5