mlx4: add a new xmit_more counter

ethtool -S reports a new counter, tracking number of time doorbell
was not triggered, because skb->xmit_more was set.

$ ethtool -S eth0 | egrep "tx_packet|xmit_more"
     tx_packets: 2413288400
     xmit_more: 666121277

I merged the tso_packet false sharing avoidance in this patch as well.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c
index c2cfb05e7290..0a0261d128b9 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c
@@ -150,14 +150,19 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
         priv->port_stats.tx_chksum_offload = 0;
         priv->port_stats.queue_stopped = 0;
         priv->port_stats.wake_queue = 0;
+        priv->port_stats.tso_packets = 0;
+        priv->port_stats.xmit_more = 0;
 
         for (i = 0; i < priv->tx_ring_num; i++) {
-                stats->tx_packets += priv->tx_ring[i]->packets;
-                stats->tx_bytes += priv->tx_ring[i]->bytes;
-                priv->port_stats.tx_chksum_offload += priv->tx_ring[i]->tx_csum;
-                priv->port_stats.queue_stopped +=
-                        priv->tx_ring[i]->queue_stopped;
-                priv->port_stats.wake_queue += priv->tx_ring[i]->wake_queue;
+                const struct mlx4_en_tx_ring *ring = priv->tx_ring[i];
+
+                stats->tx_packets += ring->packets;
+                stats->tx_bytes += ring->bytes;
+                priv->port_stats.tx_chksum_offload += ring->tx_csum;
+                priv->port_stats.queue_stopped     += ring->queue_stopped;
+                priv->port_stats.wake_queue        += ring->wake_queue;
+                priv->port_stats.tso_packets       += ring->tso_packets;
+                priv->port_stats.xmit_more         += ring->xmit_more;
         }
 
         stats->rx_errors = be64_to_cpu(mlx4_en_stats->PCS) +