staging: fsl-dpaa2/eth: Add counter for skb reallocs

Add a counter for the number of egress frames that need to be
realloc'ed due to insufficient headroom space.
Signed-off-by: NIoana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c

@@ -578,6 +578,7 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
 			percpu_stats->tx_dropped++;
 			goto err_alloc_headroom;
 		}
+		percpu_extras->tx_reallocs++;
 		dev_kfree_skb(skb);
 		skb = ns;
 	}

drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h

@@ -231,6 +231,7 @@ struct dpaa2_eth_drv_stats {
 	__u64	tx_conf_bytes;
 	__u64	tx_sg_frames;
 	__u64	tx_sg_bytes;
+	__u64	tx_reallocs;
 	__u64	rx_sg_frames;
 	__u64	rx_sg_bytes;
 	/* Enqueues retried due to portal busy */

drivers/staging/fsl-dpaa2/ethernet/dpaa2-ethtool.c

@@ -62,6 +62,7 @@ static char dpaa2_ethtool_extras[][ETH_GSTRING_LEN] = {
 	"[drv] tx conf bytes",
 	"[drv] tx sg frames",
 	"[drv] tx sg bytes",
+	"[drv] tx realloc frames",
 	"[drv] rx sg frames",
 	"[drv] rx sg bytes",
 	"[drv] enqueue portal busy",