commit 3d7d736aba67bcd447b84399ef10cb35474793a2
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date:   Fri Aug 4 14:03:04 2017 +0800

    mlx4en: Update OQDROP ifnet stat

diff --git a/sys/dev/mlx4/mlx4_en/mlx4_en_tx.c b/sys/dev/mlx4/mlx4_en/mlx4_en_tx.c
index 55c419a9f1f..6464b0b0ebe 100644
--- a/sys/dev/mlx4/mlx4_en/mlx4_en_tx.c
+++ b/sys/dev/mlx4/mlx4_en/mlx4_en_tx.c
@@ -1072,6 +1072,10 @@ mlx4_en_transmit(struct ifnet *dev, struct mbuf *m)
 		cq = priv->tx_cq[i];
 		taskqueue_enqueue(cq->tq, &cq->cq_task);
 	}
+#if __FreeBSD_version >= 1100000
+	if (err)
+		if_inc_counter(dev, IFCOUNTER_IQDROPS, 1);
+#endif
 
 	return (err);
 }