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>
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 8a02d45..fb2e3bf 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -249,6 +249,8 @@
 	unsigned int tso_packets;
 	unsigned int pushes;
 	unsigned int pio_packets;
+	/* Statistics to supplement MAC stats */
+	unsigned long tx_packets;
 
 	/* Members shared between paths and sometimes updated */
 	unsigned int empty_read_count ____cacheline_aligned_in_smp;
@@ -358,6 +360,8 @@
 	unsigned int recycle_count;
 	struct timer_list slow_fill;
 	unsigned int slow_fill_count;
+	/* Statistics to supplement MAC stats */
+	unsigned long rx_packets;
 };
 
 enum efx_sync_events_state {