[RFC][PATCH v4 02/18] Export 2 func for device to assign/dassign new structure.

[xiaohui . xin]

From: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>

Export 2 func for device to assign/deassign new strucure

Signed-off-by: Xin Xiaohui <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Zhao Yu <yzhao81@xxxxxxxxx>
Reviewed-by: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
---
 include/linux/netdevice.h |    3 +++
 net/core/dev.c            |   28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index bf79756..5c473fb 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1592,6 +1592,9 @@ extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
 					  gro_result_t ret);
 extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
 extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
+extern int netdev_mp_port_attach(struct net_device *dev,
+				 struct mpassthru_port *port);
+extern void netdev_mp_port_detach(struct net_device *dev);
 
 static inline void napi_free_frags(struct napi_struct *napi)
 {
diff --git a/net/core/dev.c b/net/core/dev.c
index e5972f7..6a73fc7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2464,6 +2464,34 @@ void netif_nit_deliver(struct sk_buff *skb)
 	rcu_read_unlock();
 }
 
+/* Export two functions to assign/de-assign mp_port pointer
+ * to a net device.
+ */
+
+int netdev_mp_port_attach(struct net_device *dev,
+			struct mpassthru_port *port)
+{
+	/* locked by mp_mutex */
+	if (rcu_dereference(dev->mp_port))
+		return -EBUSY;
+
+	rcu_assign_pointer(dev->mp_port, port);
+
+	return 0;
+}
+EXPORT_SYMBOL(netdev_mp_port_attach);
+
+void netdev_mp_port_detach(struct net_device *dev)
+{
+	/* locked by mp_mutex */
+	if (!rcu_dereference(dev->mp_port))
+		return;
+
+	rcu_assign_pointer(dev->mp_port, NULL);
+	synchronize_rcu();
+}
+EXPORT_SYMBOL(netdev_mp_port_detach);
+
 /**
  *	netif_receive_skb - process receive buffer from network
  *	@skb: buffer to process
-- 
1.5.4.4

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