cilium-dbg: listing load-balancing configurations displays L7LB proxy port

[mhofstetter]

Currently, listing the load-balancing configuration doesn't display the L7LB Proxy Port for services of type l7-load-balancer.

> cilium-dbg bpf lb list
SERVICE ADDRESS     BACKEND ADDRESS (REVNAT_ID) (SLOT)
...
10.96.193.7:443     0.0.0.0:0 (30) (0) [ClusterIP, non-routable, l7-load-balancer]

The only way of retrieving the L7LB proxy port is to list the frontends (cilium-dbg bpf lb list --frontends) and manually convert the backend id (union type) to the L7LB proxy port.

Therefore, this commit addsd the L7LB proxy port to the output of cilium-dbg bpf lb list if the service is of type L7 LoadBalancer. The --frontends subcommand still displays the unmapped backend id.

> cilium-dbg bpf lb list
SERVICE ADDRESS     BACKEND ADDRESS (REVNAT_ID) (SLOT)
10.96.0.1:443       172.18.0.3:6443 (1) (1)
                    0.0.0.0:0 (1) (0) [ClusterIP, non-routable]
10.96.252.10:443    172.18.0.2:4244 (22) (1)
                    0.0.0.0:0 (22) (0) [ClusterIP, InternalLocal, non-routable]
10.96.155.44:80     0.0.0.0:0 (14) (0) [ClusterIP, non-routable]
                    10.244.1.211:80 (14) (1)
172.18.0.2:32646    0.0.0.0:0 (33) (0) [NodePort, l7-load-balancer] (L7LB Proxy Port: 15735)
10.96.193.7:443     0.0.0.0:0 (30) (0) [ClusterIP, non-routable, l7-load-balancer] (L7LB Proxy Port: 15735)
10.96.122.45:80     10.244.1.250:80 (26) (1)
                    0.0.0.0:0 (26) (0) [ClusterIP, non-routable]
10.96.102.137:80    0.0.0.0:0 (23) (0) [ClusterIP, non-routable]
                    10.244.1.126:4245 (23) (1)
10.96.108.180:443   0.0.0.0:0 (17) (0) [ClusterIP, non-routable, l7-load-balancer] (L7LB Proxy Port: 17731)
172.18.255.1:80     0.0.0.0:0 (25) (0) [LoadBalancer, l7-load-balancer] (L7LB Proxy Port: 17731)
0.0.0.0:32646       0.0.0.0:0 (34) (0) [NodePort, non-routable, l7-load-balancer] (L7LB Proxy Port: 15735)
0.0.0.0:31012       0.0.0.0:0 (21) (0) [NodePort, non-routable, l7-load-balancer] (L7LB Proxy Port: 17731)

[mhofstetter]

/test

[sayboras]

LGTM.

This is actually very helpful information for debugging and troubleshooting, WDYT about nominate for backport to all release branches (e.g. 1.15, 1.14 and 1.13)?

[mhofstetter]

This is actually very helpful information for debugging and troubleshooting, WDYT about nominate for backport to all release branches (e.g. 1.15, 1.14 and 1.13)?

Good idea - i added the labels.

[ysksuzuki]

LGTM