dcb: Add DCBX capabilities bitmask to the get_ieee response

Adding the capabilities bitmask to the get_ieee response allows user space to determine the current DCBX mode. Either CEE or IEEE this is useful with devices that support switching between modes where knowing the current state is relevant. Derived from work by Mark Rustad Signed-off-by: John Fastabend <[email protected]> Signed-off-by: David S. Miller <[email protected]>
mrwenhui · Jun 21, 2011 · c7797ba · c7797ba
1 parent f4b5ad2
commit c7797ba
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
@@ -1288,6 +1288,7 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
 	struct nlattr *ieee, *app;
 	struct dcb_app_type *itr;
 	const struct dcbnl_rtnl_ops *ops = netdev->dcbnl_ops;
+	int dcbx;
 	int err;
 
 	if (!ops)
@@ -1338,6 +1339,12 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
 			}
 		}
 	}
+
+	if (netdev->dcbnl_ops->getdcbx)
+		dcbx = netdev->dcbnl_ops->getdcbx(netdev);
+	else
+		dcbx = -EOPNOTSUPP;
+
 	spin_unlock(&dcb_lock);
 	nla_nest_end(skb, app);
 
@@ -1366,6 +1373,11 @@ static int dcbnl_ieee_get(struct net_device *netdev, struct nlattr **tb,
 	}
 
 	nla_nest_end(skb, ieee);
+	if (dcbx >= 0) {
+		err = nla_put_u8(skb, DCB_ATTR_DCBX, dcbx);
+		if (err)
+			goto nla_put_failure;
+	}
 	nlmsg_end(skb, nlh);
 
 	return rtnl_unicast(skb, &init_net, pid);