[Bridge] [PATCH iproute2 v4] iplink: add support for STP xstats

[Vivien Didelot]

Add support for the BRIDGE_XSTATS_STP xstats, as follow:

    # ip link xstats type bridge_slave dev lan4 stp
    lan4
                        STP BPDU:  RX: 0 TX: 61
                        STP TCN:   RX: 0 TX: 0
                        STP Transitions: Blocked: 2 Forwarding: 1

Or below as JSON:

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

Signed-off-by: Vivien Didelot <vivien.didelot at gmail.com>
---
 include/uapi/linux/if_bridge.h | 10 ++++++++++
 ip/iplink_bridge.c             | 26 ++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/uapi/linux/if_bridge.h b/include/uapi/linux/if_bridge.h
index 31fc51bd..9fefc7f3 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] = {
@@ -262,6 +271,7 @@ enum {
 	BRIDGE_XSTATS_VLAN,
 	BRIDGE_XSTATS_MCAST,
 	BRIDGE_XSTATS_PAD,
+	BRIDGE_XSTATS_STP,
 	__BRIDGE_XSTATS_MAX
 };
 #define BRIDGE_XSTATS_MAX (__BRIDGE_XSTATS_MAX - 1)
diff --git a/ip/iplink_bridge.c b/ip/iplink_bridge.c
index 06f736d4..bbd6f3a8 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 +808,29 @@ 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:  ", "");
+			print_u64(PRINT_ANY, "rx_bpdu", "RX: %llu ",
+				  sstats->rx_bpdu);
+			print_u64(PRINT_ANY, "tx_bpdu", "TX: %llu\n",
+				  sstats->tx_bpdu);
+			print_string(PRINT_FP, NULL,
+				     "%-16s    STP TCN:   ", "");
+			print_u64(PRINT_ANY, "rx_tcn", "RX: %llu ",
+				  sstats->rx_tcn);
+			print_u64(PRINT_ANY, "tx_tcn", "TX: %llu\n",
+				  sstats->tx_tcn);
+			print_string(PRINT_FP, NULL,
+				     "%-16s    STP Transitions: ", "");
+			print_u64(PRINT_ANY, "transition_blk", "Blocked: %llu ",
+				  sstats->transition_blk);
+			print_u64(PRINT_ANY, "transition_fwd", "Forwarding: %llu\n",
+				  sstats->transition_fwd);
+			close_json_object();
+			break;
 		}
 	}
 	close_json_object();
@@ -843,6 +867,8 @@ 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