net/mlx4_en: Add ethtool statistics for XDP cases

XDP statistics are reported in ethtool, in total and per ring,
as follows:
- xdp_drop: the number of packets dropped by xdp.
- xdp_tx: the number of packets forwarded by xdp.
- xdp_tx_full: the number of times an xdp forward failed
	due to a full tx xdp ring.

In addition, all packets that are dropped/forwarded by XDP
are no longer accounted in rx_packets/rx_bytes of the ring,
so that they count traffic that is passed to the stack.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index 95dc864bb2f7..5de3cbe24f2b 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -1079,7 +1079,8 @@ tx_drop:
 	return NETDEV_TX_OK;
 }
 
-netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
+netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
+			       struct mlx4_en_rx_alloc *frame,
 			       struct net_device *dev, unsigned int length,
 			       int tx_ind, int *doorbell_pending)
 {
@@ -1154,8 +1155,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
 		((ring->prod & ring->size) ?
 		 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 
-	ring->packets++;
-	ring->bytes += tx_info->nr_bytes;
+	rx_ring->xdp_tx++;
 	AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, length);
 
 	ring->prod += nr_txbb;
@@ -1179,7 +1179,7 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_alloc *frame,
 	return NETDEV_TX_OK;
 
 tx_drop_count:
-	ring->tx_dropped++;
+	rx_ring->xdp_tx_full++;
 tx_drop:
 	return NETDEV_TX_BUSY;
 }