iplink: bridge: add support for displaying xstats

Add support for the new parse/print_ifla_xstats callbacks and use them to
print the per-bridge multicast stats.
Example:
$ ip link xstats type bridge
br0
                    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

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
1 file changed