net/core: Add support for getting VF GUIDs

Introduce a new ndo: ndo_get_vf_guid, to get from the net
device the port and node GUID.

New applications can choose to use this interface to show
GUIDs with iproute2 with commands such as:

- ip link show ib4
ib4: <BROADCAST,MULTICAST> mtu 4092 qdisc noop state DOWN mode DEFAULT group default qlen 256
link/infiniband 00:00:0a:2d:fe:80:00:00:00:00:00:00:ec:0d:9a:03:00:44:36:8d brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff
vf 0     link/infiniband 00:00:0a:2d:fe:80:00:00:00:00:00:00:ec:0d:9a:03:00:44:36:8d brd 00:ff:ff:ff:ff:12:40:1b:ff:ff:00:00:00:00:00:00:ff:ff:ff:ff,
spoof checking off, NODE_GUID 22:44:33:00:33:11:00:33, PORT_GUID 10:21:33:12:00:11:22:10, link-state disable, trust off, query_rss off
Signed-off-by: Danit Goldberg <danitg@mellanox.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

include/linux/netdevice.h

@@ -1316,6 +1316,10 @@ struct net_device_ops {
 						   struct nlattr *port[]);
 	int			(*ndo_get_vf_port)(struct net_device *dev,
 						   int vf, struct sk_buff *skb);
+	int			(*ndo_get_vf_guid)(struct net_device *dev,
+						   int vf,
+						   struct ifla_vf_guid *node_guid,
+						   struct ifla_vf_guid *port_guid);
 	int			(*ndo_set_vf_guid)(struct net_device *dev,
 						   int vf, u64 guid,
 						   int guid_type);

net/core/rtnetlink.c

@@ -1204,6 +1204,8 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
 	struct ifla_vf_mac vf_mac;
 	struct ifla_vf_broadcast vf_broadcast;
 	struct ifla_vf_info ivi;
+	struct ifla_vf_guid node_guid;
+	struct ifla_vf_guid port_guid;
 
 	memset(&ivi, 0, sizeof(ivi));
 
@@ -1270,6 +1272,18 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct sk_buff *skb,
 	    nla_put(skb, IFLA_VF_TRUST,
 		    sizeof(vf_trust), &vf_trust))
 		goto nla_put_vf_failure;
+
+	memset(&node_guid, 0, sizeof(node_guid));
+	memset(&port_guid, 0, sizeof(port_guid));
+	if (dev->netdev_ops->ndo_get_vf_guid &&
+	    !dev->netdev_ops->ndo_get_vf_guid(dev, vfs_num, &node_guid,
+					      &port_guid)) {
+		if (nla_put(skb, IFLA_VF_IB_NODE_GUID, sizeof(node_guid),
+			    &node_guid) ||
+		    nla_put(skb, IFLA_VF_IB_PORT_GUID, sizeof(port_guid),
+			    &port_guid))
+			goto nla_put_vf_failure;
+	}
 	vfvlanlist = nla_nest_start_noflag(skb, IFLA_VF_VLAN_LIST);
 	if (!vfvlanlist)
 		goto nla_put_vf_failure;