sfc: Add per-queue statistics in ethtool

Implement per channel software TX and RX packet counters
accessed as ethtool statistics.

This allows confirmation with MAC statistics.

Signed-off-by: Shradha Shah <sshah@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/tx.c

@@ -452,6 +452,8 @@ finish_packet:
 	/* Pass off to hardware */
 	efx_nic_push_buffers(tx_queue);
 
+	tx_queue->tx_packets++;
+
 	efx_tx_maybe_stop_queue(tx_queue);
 
 	return NETDEV_TX_OK;
@@ -1245,6 +1247,8 @@ static int tso_start_new_packet(struct efx_tx_queue *tx_queue,
 
 	++tx_queue->tso_packets;
 
+	++tx_queue->tx_packets;
+
 	return 0;
 }