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>
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index adedc47..0c50125 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -840,7 +840,7 @@
* note that we already verified that it is linear */
memcpy(tx_desc->lso.header, skb->data, lso_header_size);
- priv->port_stats.tso_packets++;
+ ring->tso_packets++;
i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) +
!!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size);
tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
@@ -910,6 +910,8 @@
wmb();
iowrite32be(ring->doorbell_qpn,
ring->bf.uar->map + MLX4_SEND_DOORBELL);
+ } else {
+ ring->xmit_more++;
}
}