net: ena: ethtool: add stats printing to XDP queues

Added statistics for TX queues that are used for XDP TX. The statistics
are the same as the ones printed for regular non-XDP TX queues.

The XDP queue statistics can be queried using
`ethtool -S <ifname>`
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amazon/ena/ena_ethtool.c

@@ -152,7 +152,7 @@ static void ena_queue_stats(struct ena_adapter *adapter, u64 **data)
 	u64 *ptr;
 	int i, j;
 
-	for (i = 0; i < adapter->num_io_queues; i++) {
+	for (i = 0; i < adapter->num_io_queues + adapter->xdp_num_queues; i++) {
 		/* Tx stats */
 		ring = &adapter->tx_ring[i];
 
@@ -163,7 +163,8 @@ static void ena_queue_stats(struct ena_adapter *adapter, u64 **data)
 
 			ena_safe_update_stat(ptr, (*data)++, &ring->syncp);
 		}
-
+		/* XDP TX queues don't have a RX queue counterpart */
+		if (!ENA_IS_XDP_INDEX(adapter, i)) {
 			/* Rx stats */
 			ring = &adapter->rx_ring[i];
 
@@ -176,6 +177,7 @@ static void ena_queue_stats(struct ena_adapter *adapter, u64 **data)
 				ena_safe_update_stat(ptr, (*data)++, &ring->syncp);
 			}
 		}
+	}
 }
 
 static void ena_dev_admin_queue_stats(struct ena_adapter *adapter, u64 **data)
@@ -238,6 +240,7 @@ static void ena_get_ethtool_stats(struct net_device *netdev,
 static int ena_get_sw_stats_count(struct ena_adapter *adapter)
 {
 	return adapter->num_io_queues * (ENA_STATS_ARRAY_TX + ENA_STATS_ARRAY_RX)
+		+ adapter->xdp_num_queues * ENA_STATS_ARRAY_TX
 		+ ENA_STATS_ARRAY_GLOBAL + ENA_STATS_ARRAY_ENA_COM;
 }
 
@@ -259,18 +262,25 @@ int ena_get_sset_count(struct net_device *netdev, int sset)
 static void ena_queue_strings(struct ena_adapter *adapter, u8 **data)
 {
 	const struct ena_stats *ena_stats;
+	bool is_xdp;
 	int i, j;
 
-	for (i = 0; i < adapter->num_io_queues; i++) {
+	for (i = 0; i < adapter->num_io_queues + adapter->xdp_num_queues; i++) {
+		is_xdp = ENA_IS_XDP_INDEX(adapter, i);
 		/* Tx stats */
 		for (j = 0; j < ENA_STATS_ARRAY_TX; j++) {
 			ena_stats = &ena_stats_tx_strings[j];
 
 			snprintf(*data, ETH_GSTRING_LEN,
-				 "queue_%u_tx_%s", i, ena_stats->name);
+				 "queue_%u_%s_%s", i,
+				 is_xdp ? "xdp_tx" : "tx", ena_stats->name);
 			(*data) += ETH_GSTRING_LEN;
 		}
-		/* Rx stats */
+
+		if (!is_xdp) {
+			/* RX stats, in XDP there isn't a RX queue
+			 * counterpart
+			 */
 			for (j = 0; j < ENA_STATS_ARRAY_RX; j++) {
 				ena_stats = &ena_stats_rx_strings[j];
 
@@ -279,6 +289,7 @@ static void ena_queue_strings(struct ena_adapter *adapter, u8 **data)
 				(*data) += ETH_GSTRING_LEN;
 			}
 		}
+	}
 }
 
 static void ena_com_dev_strings(u8 **data)