Add support for the BRIDGE_XSTATS_STP xstats, as follow:

    # ip link xstats type bridge_slave dev lan5
                        STP BPDU:
                          RX: 0
                          TX: 39
                        STP TCN:
                          RX: 0
                          TX: 0
                        STP Transitions:
                          Blocked: 0
                          Forwarding: 1
                        IGMP queries:
                          RX: v1 0 v2 0 v3 0
                          TX: v1 0 v2 0 v3 0
    ...

Or below as JSON:

    # ip -j -p link xstats type bridge_slave dev lan0 | head
    [ {
            "ifname": "lan0",
            "stp": {
                "rx_bpdu": 0,
                "tx_bpdu": 500,
                "rx_tcn": 0,
                "tx_tcn": 0,
                "transition_blk": 0,
                "transition_fwd": 1
            },
    ...

Signed-off-by: Vivien Didelot <vivien.dide...@gmail.com>
---
 include/uapi/linux/if_bridge.h | 10 ++++++++++
 ip/iplink_bridge.c             | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 31fc51bd..42f76697 100644
--- a/include/uapi/linux/if_bridge.h
+++ b/include/uapi/linux/if_bridge.h
@@ -156,6 +156,15 @@ struct bridge_vlan_xstats {
        __u32 pad2;
 };
 
+struct bridge_stp_xstats {
+       __u64 transition_blk;
+       __u64 transition_fwd;
+       __u64 rx_bpdu;
+       __u64 tx_bpdu;
+       __u64 rx_tcn;
+       __u64 tx_tcn;
+};
+
 /* Bridge multicast database attributes
  * [MDBA_MDB] = {
  *     [MDBA_MDB_ENTRY] = {
@@ -261,6 +270,7 @@ enum {
        BRIDGE_XSTATS_UNSPEC,
        BRIDGE_XSTATS_VLAN,
        BRIDGE_XSTATS_MCAST,
+       BRIDGE_XSTATS_STP,
        BRIDGE_XSTATS_PAD,
        __BRIDGE_XSTATS_MAX
 };
diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index 06f736d4..92e051c8 100644
--- a/ip/iplink_bridge.c
+++ b/ip/iplink_bridge.c
@@ -688,6 +688,7 @@ static void bridge_print_xstats_help(struct link_util *lu, 
FILE *f)
 static void bridge_print_stats_attr(struct rtattr *attr, int ifindex)
 {
        struct rtattr *brtb[LINK_XSTATS_TYPE_MAX+1];
+       struct bridge_stp_xstats *sstats;
        struct br_mcast_stats *mstats;
        struct rtattr *i, *list;
        const char *ifname = "";
@@ -807,6 +808,35 @@ static void bridge_print_stats_attr(struct rtattr *attr, 
int ifindex)
                                  mstats->mld_parse_errors);
                        close_json_object();
                        break;
+               case BRIDGE_XSTATS_STP:
+                       sstats = RTA_DATA(i);
+                       open_json_object("stp");
+                       print_string(PRINT_FP, NULL,
+                                    "%-16s    STP BPDU:\n", "");
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "rx_bpdu", "RX: %llu\n",
+                                 sstats->rx_bpdu);
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "tx_bpdu", "TX: %llu\n",
+                                 sstats->tx_bpdu);
+                       print_string(PRINT_FP, NULL,
+                                    "%-16s    STP TCN:\n", "");
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "rx_tcn", "RX: %llu\n",
+                                 sstats->rx_tcn);
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "tx_tcn", "TX: %llu\n",
+                                 sstats->tx_tcn);
+                       print_string(PRINT_FP, NULL,
+                                    "%-16s    STP Transitions:\n", "");
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "transition_blk", "Blocked: 
%llu\n",
+                                 sstats->transition_blk);
+                       print_string(PRINT_FP, NULL, "%-16s      ", "");
+                       print_u64(PRINT_ANY, "transition_fwd", "Forwarding: 
%llu\n",
+                                 sstats->transition_fwd);
+                       close_json_object();
+                       break;
                }
        }
        close_json_object();
@@ -843,6 +873,8 @@ int bridge_parse_xstats(struct link_util *lu, int argc, 
char **argv)
        while (argc > 0) {
                if (strcmp(*argv, "igmp") == 0 || strcmp(*argv, "mcast") == 0) {
                        xstats_print_attr = BRIDGE_XSTATS_MCAST;
+               } else if (strcmp(*argv, "stp") == 0) {
+                       xstats_print_attr = BRIDGE_XSTATS_STP;
                } else if (strcmp(*argv, "dev") == 0) {
                        NEXT_ARG();
                        filter_index = ll_name_to_index(*argv);
-- 
2.24.0

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