dcb: add DCBX mode to event notifier attributes

Add DCBX mode to event notifiers so listeners can learn
currently enabled mode.

Signed-off-by: John Fastabend <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/dcbnl.h

···
 	int	ifindex;
 	struct dcb_app	  app;
 	struct list_head  list;
+	u8	dcbx;
 };
 
 int dcb_setapp(struct net_device *, struct dcb_app *);

net/dcb/dcbnl.c

···
 
 	event.ifindex = dev->ifindex;
 	memcpy(&event.app, new, sizeof(event.app));
+	if (dev->dcbnl_ops->getdcbx)
+		event.dcbx = dev->dcbnl_ops->getdcbx(dev);
 
 	spin_lock(&dcb_lock);
 	/* Search for existing match and replace */
···
 
 	event.ifindex = dev->ifindex;
 	memcpy(&event.app, new, sizeof(event.app));
+	if (dev->dcbnl_ops->getdcbx)
+		event.dcbx = dev->dcbnl_ops->getdcbx(dev);
 
 	spin_lock(&dcb_lock);
 	/* Search for existing match and abort if found */
···
 
 	event.ifindex = dev->ifindex;
 	memcpy(&event.app, del, sizeof(event.app));
+	if (dev->dcbnl_ops->getdcbx)
+		event.dcbx = dev->dcbnl_ops->getdcbx(dev);
 
 	spin_lock(&dcb_lock);
 	/* Search for existing match and remove it. */