be2net: add a counter for pkts dropped in xmit path

In the xmit path, the driver may drop some pkts due to reasons such as
DMA mapping errors, out of memory conditions or to protect HW from
unrecoverable errors. Add a counter in TX-stats for such drops.

Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index e7cbc56a..21b064f 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -225,6 +225,7 @@
 	u64 tx_compl;
 	ulong tx_jiffies;
 	u32 tx_stops;
+	u32 tx_drv_drops;	/* pkts dropped by driver */
 	struct u64_stats_sync sync;
 	struct u64_stats_sync sync_compl;
 };