fix(bridge): avoid LinkByName netlink calls

Main reason is perfoamnce.
If we have the relevant info in the cache/DB,
we could just use it instead of netlink get calls.

Fixes #123

Signed-off-by: Boris Glimcher <Boris.Glimcher@emc.com>

pkg/evpn/bridge.go

@@ -60,12 +60,6 @@ func (s *Server) CreateLogicalBridge(_ context.Context, in *pb.CreateLogicalBrid
 	}
 	// create vxlan only if VNI is not empty
 	if in.LogicalBridge.Spec.Vni != nil {
-		bridge, err := s.nLink.LinkByName(tenantbridgeName)
-		if err != nil {
-			err := status.Errorf(codes.NotFound, "unable to find key %s", tenantbridgeName)
-			log.Printf("error: %v", err)
-			return nil, err
-		}
 		// Example: ip link add vxlan-<LB-vlan-id> type vxlan id <LB-vni> local <vtep-ip> dstport 4789 nolearning proxy
 		myip := make(net.IP, 4)
 		// TODO: remove hard-coded 167772162 == "10.0.0.2"
@@ -79,6 +73,7 @@ func (s *Server) CreateLogicalBridge(_ context.Context, in *pb.CreateLogicalBrid
 			return nil, err
 		}
 		// Example: ip link set vxlan-<LB-vlan-id> master br-tenant addrgenmode none
+		bridge := &netlink.Bridge{LinkAttrs: netlink.LinkAttrs{Name: tenantbridgeName}}
 		if err := s.nLink.LinkSetMaster(vxlan, bridge); err != nil {
 			fmt.Printf("Failed to add Vxlan to bridge: %v", err)
 			return nil, err

pkg/evpn/svi.go

@@ -78,12 +78,7 @@ func (s *Server) CreateSvi(_ context.Context, in *pb.CreateSviRequest) (*pb.Svi,
 		return nil, err
 	}
 	// not found, so create a new one
-	bridge, err := s.nLink.LinkByName(tenantbridgeName)
-	if err != nil {
-		err := status.Errorf(codes.NotFound, "unable to find key %s", tenantbridgeName)
-		log.Printf("error: %v", err)
-		return nil, err
-	}
+	bridge := &netlink.Bridge{LinkAttrs: netlink.LinkAttrs{Name: tenantbridgeName}}
 	vid := uint16(bridgeObject.Spec.VlanId)
 	// Example: bridge vlan add dev br-tenant vid <vlan-id> self
 	if err := s.nLink.BridgeVlanAdd(bridge, vid, false, false, true, false); err != nil {

pkg/evpn/vrf.go

@@ -193,13 +193,8 @@ func (s *Server) DeleteVrf(_ context.Context, in *pb.DeleteVrfRequest) (*emptypb
 		}
 		// use netlink to find BRIDGE device
 		bridgeName := fmt.Sprintf("br%d", *obj.Spec.Vni)
-		bridgedev, err := s.nLink.LinkByName(bridgeName)
+		bridgedev := &netlink.Bridge{LinkAttrs: netlink.LinkAttrs{Name: bridgeName}}
 		log.Printf("Deleting BRIDGE %v", bridgedev)
-		if err != nil {
-			err := status.Errorf(codes.NotFound, "unable to find key %s", bridgeName)
-			log.Printf("error: %v", err)
-			return nil, err
-		}
 		// bring link down
 		if err := s.nLink.LinkSetDown(bridgedev); err != nil {
 			fmt.Printf("Failed to up link: %v", err)