ipstats: Expose bridge stats in ipstats

ipstats: Expose bridge stats in ipstats

Bridge supports two suites, STP and IGMP, carried by attributes
BRIDGE_XSTATS_STP and BRIDGE_XSTATS_MCAST. Expose them as suites "stp" and
"mcast" (to correspond to the attribute name).

For example:

 # ip stats show dev swp1 group xstats_slave subgroup bridge
 56: swp1: group xstats_slave subgroup bridge suite mcast
                     IGMP queries:
                       RX: v1 0 v2 0 v3 0
                       TX: v1 0 v2 0 v3 0
                     IGMP reports:
                       RX: v1 0 v2 0 v3 0
                       TX: v1 0 v2 0 v3 0
                     IGMP leaves: RX: 0 TX: 0
                     IGMP parse errors: 0
                     MLD queries:
                       RX: v1 0 v2 0
                       TX: v1 0 v2 0
                     MLD reports:
                       RX: v1 0 v2 0
                       TX: v1 0 v2 0
                     MLD leaves: RX: 0 TX: 0
                     MLD parse errors: 0

 56: swp1: group xstats_slave subgroup bridge suite stp
                     STP BPDU:  RX: 0 TX: 0
                     STP TCN:   RX: 0 TX: 0
                     STP Transitions: Blocked: 1 Forwarding: 0

 # ip -j stats show dev swp1 group xstats_slave subgroup bridge | jq
 [
   {
     "ifindex": 56,
     "ifname": "swp1",
     "group": "xstats_slave",
     "subgroup": "bridge",
     "suite": "mcast",
     "multicast": {
       "igmp_queries": {
         "rx_v1": 0,
         "rx_v2": 0,
         "rx_v3": 0,
         "tx_v1": 0,
         "tx_v2": 0,
         "tx_v3": 0
       },
       "igmp_reports": {
         "rx_v1": 0,
         "rx_v2": 0,
         "rx_v3": 0,
         "tx_v1": 0,
         "tx_v2": 0,
         "tx_v3": 0
       },
       "igmp_leaves": {
         "rx": 0,
         "tx": 0
       },
       "igmp_parse_errors": 0,
       "mld_queries": {
         "rx_v1": 0,
         "rx_v2": 0,
         "tx_v1": 0,
         "tx_v2": 0
       },
       "mld_reports": {
         "rx_v1": 0,
         "rx_v2": 0,
         "tx_v1": 0,
         "tx_v2": 0
       },
       "mld_leaves": {
         "rx": 0,
         "tx": 0
       },
       "mld_parse_errors": 0
     }
   },
   {
     "ifindex": 56,
     "ifname": "swp1",
     "group": "xstats_slave",
     "subgroup": "bridge",
     "suite": "stp",
     "stp": {
       "rx_bpdu": 0,
       "tx_bpdu": 0,
       "rx_tcn": 0,
       "tx_tcn": 0,
       "transition_blk": 1,
       "transition_fwd": 0
     }
   }
 ]

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>