net/mlx5e: Add local loopback counter to vport stats

Add counter for number of unicast, multicast and broadcast packets/
octets that were loopback.

Signed-off-by: Or Har-Toov <ohartoov@nvidia.com>
Reviewed-by: Avihai Horon <avihaih@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Documentation/networking/device_drivers/ethernet/mellanox/mlx5/counters.rst

@@ -797,6 +797,16 @@ Counters on the NIC port that is connected to a eSwitch.
        RoCE/UD/RC traffic) [#accel]_.
      - Acceleration
 
+   * - `vport_loopback_packets`
+     - Unicast, multicast and broadcast packets that were loop-back (received
+       and transmitted), IB/Eth  [#accel]_.
+     - Acceleration
+
+   * - `vport_loopback_bytes`
+     - Unicast, multicast and broadcast bytes that were loop-back (received
+       and transmitted), IB/Eth  [#accel]_.
+     - Acceleration
+
    * - `rx_steer_missed_packets`
      - Number of packets that was received by the NIC, however was discarded
        because it did not match any flow in the NIC flow table.

drivers/net/ethernet/mellanox/mlx5/core/en_stats.c

@@ -748,11 +748,22 @@ static const struct counter_desc vport_stats_desc[] = {
 		VPORT_COUNTER_OFF(transmitted_ib_multicast.octets) },
 };
 
+static const struct counter_desc vport_loopback_stats_desc[] = {
+	{ "vport_loopback_packets",
+		VPORT_COUNTER_OFF(local_loopback.packets) },
+	{ "vport_loopback_bytes",
+		VPORT_COUNTER_OFF(local_loopback.octets) },
+};
+
 #define NUM_VPORT_COUNTERS		ARRAY_SIZE(vport_stats_desc)
+#define NUM_VPORT_LOOPBACK_COUNTERS(dev) \
+	(MLX5_CAP_GEN(dev, vport_counter_local_loopback) ? \
+	 ARRAY_SIZE(vport_loopback_stats_desc) : 0)
 
 static MLX5E_DECLARE_STATS_GRP_OP_NUM_STATS(vport)
 {
-	return NUM_VPORT_COUNTERS;
+	return NUM_VPORT_COUNTERS +
+		NUM_VPORT_LOOPBACK_COUNTERS(priv->mdev);
 }
 
 static MLX5E_DECLARE_STATS_GRP_OP_FILL_STRS(vport)
@@ -761,6 +772,11 @@ static MLX5E_DECLARE_STATS_GRP_OP_FILL_STRS(vport)
 
 	for (i = 0; i < NUM_VPORT_COUNTERS; i++)
 		strcpy(data + (idx++) * ETH_GSTRING_LEN, vport_stats_desc[i].format);
+
+	for (i = 0; i < NUM_VPORT_LOOPBACK_COUNTERS(priv->mdev); i++)
+		strcpy(data + (idx++) * ETH_GSTRING_LEN,
+		       vport_loopback_stats_desc[i].format);
+
 	return idx;
 }
 
@@ -771,6 +787,11 @@ static MLX5E_DECLARE_STATS_GRP_OP_FILL_STATS(vport)
 	for (i = 0; i < NUM_VPORT_COUNTERS; i++)
 		data[idx++] = MLX5E_READ_CTR64_BE(priv->stats.vport.query_vport_out,
 						  vport_stats_desc, i);
+
+	for (i = 0; i < NUM_VPORT_LOOPBACK_COUNTERS(priv->mdev); i++)
+		data[idx++] = MLX5E_READ_CTR64_BE(priv->stats.vport.query_vport_out,
+						  vport_loopback_stats_desc, i);
+
 	return idx;
 }