net: sparx5: add support for matchall mirror stats

Add support for tc matchall mirror stats. When a new matchall mirror
rule is added, the baseline stats for that port is saved.
Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Reviewed-by: Steen Hegelund <Steen.Hegelund@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

@@ -174,6 +174,7 @@ struct sparx5_port {
 	struct phylink_config phylink_config;
 	struct phylink *phylink;
 	struct phylink_pcs phylink_pcs;
+	struct flow_stats mirror_stats;
 	u16 portno;
 	/* Ingress default VLAN (pvid) */
 	u16 pvid;
@@ -562,6 +563,8 @@ void sparx5_new_base_time(struct sparx5 *sparx5, const u32 cycle_time,
 /* sparx5_mirror.c */
 int sparx5_mirror_add(struct sparx5_mall_entry *entry);
 void sparx5_mirror_del(struct sparx5_mall_entry *entry);
+void sparx5_mirror_stats(struct sparx5_mall_entry *entry,
+			 struct flow_stats *fstats);
 
 /* Clock period in picoseconds */
 static inline u32 sparx5_clk_period(enum sparx5_core_clockfreq cclock)

drivers/net/ethernet/microchip/sparx5/sparx5_mirror.c

@@ -196,3 +196,40 @@ void sparx5_mirror_del(struct sparx5_mall_entry *entry)
 				  mirror_idx,
 				  SPX5_MIRROR_MONITOR_PORT_DEFAULT);
 }
+
+void sparx5_mirror_stats(struct sparx5_mall_entry *entry,
+			 struct flow_stats *fstats)
+{
+	struct sparx5_port *port = entry->port;
+	struct rtnl_link_stats64 new_stats;
+	struct flow_stats *old_stats;
+
+	old_stats = &entry->port->mirror_stats;
+	sparx5_get_stats64(port->ndev, &new_stats);
+
+	if (entry->ingress) {
+		flow_stats_update(fstats,
+				  new_stats.rx_bytes - old_stats->bytes,
+				  new_stats.rx_packets - old_stats->pkts,
+				  new_stats.rx_dropped - old_stats->drops,
+				  old_stats->lastused,
+				  FLOW_ACTION_HW_STATS_IMMEDIATE);
+
+		old_stats->bytes = new_stats.rx_bytes;
+		old_stats->pkts = new_stats.rx_packets;
+		old_stats->drops = new_stats.rx_dropped;
+		old_stats->lastused = jiffies;
+	} else {
+		flow_stats_update(fstats,
+				  new_stats.tx_bytes - old_stats->bytes,
+				  new_stats.tx_packets - old_stats->pkts,
+				  new_stats.tx_dropped - old_stats->drops,
+				  old_stats->lastused,
+				  FLOW_ACTION_HW_STATS_IMMEDIATE);
+
+		old_stats->bytes = new_stats.tx_bytes;
+		old_stats->pkts = new_stats.tx_packets;
+		old_stats->drops = new_stats.tx_dropped;
+		old_stats->lastused = jiffies;
+	}
+}

drivers/net/ethernet/microchip/sparx5/sparx5_tc_matchall.c

@@ -96,6 +96,8 @@ static int sparx5_tc_matchall_replace(struct net_device *ndev,
 			}
 			return err;
 		}
+		/* Get baseline stats for this port */
+		sparx5_mirror_stats(mall_entry, &tmo->stats);
 		break;
 	case FLOW_ACTION_GOTO:
 		err = vcap_enable_lookups(sparx5->vcap_ctrl, ndev,
@@ -162,6 +164,29 @@ static int sparx5_tc_matchall_destroy(struct net_device *ndev,
 	return err;
 }
 
+static int sparx5_tc_matchall_stats(struct net_device *ndev,
+				    struct tc_cls_matchall_offload *tmo,
+				    bool ingress)
+{
+	struct sparx5_port *port = netdev_priv(ndev);
+	struct sparx5 *sparx5 = port->sparx5;
+	struct sparx5_mall_entry *entry;
+
+	entry = sparx5_tc_matchall_entry_find(&sparx5->mall_entries,
+					      tmo->cookie);
+	if (!entry)
+		return -ENOENT;
+
+	if (entry->type == FLOW_ACTION_MIRRED) {
+		sparx5_mirror_stats(entry, &tmo->stats);
+	} else {
+		NL_SET_ERR_MSG_MOD(tmo->common.extack, "Unsupported action");
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
+}
+
 int sparx5_tc_matchall(struct net_device *ndev,
 		       struct tc_cls_matchall_offload *tmo,
 		       bool ingress)
@@ -171,6 +196,8 @@ int sparx5_tc_matchall(struct net_device *ndev,
 		return sparx5_tc_matchall_replace(ndev, tmo, ingress);
 	case TC_CLSMATCHALL_DESTROY:
 		return sparx5_tc_matchall_destroy(ndev, tmo, ingress);
+	case TC_CLSMATCHALL_STATS:
+		return sparx5_tc_matchall_stats(ndev, tmo, ingress);
 	default:
 		return -EOPNOTSUPP;
 	}