igb: Remove setting of RX software timestamp

The responsibility for reporting of RX software timestamp has moved to
the core layer (see __ethtool_get_ts_info()), remove usage from the
device drivers.

Reviewed-by: Carolina Jubran <cjubran@nvidia.com>
Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com>
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Author: gal-pressman

drivers/net/ethernet/intel/igb/igb_ethtool.c

@@ -2387,15 +2387,11 @@ static int igb_get_ts_info(struct net_device *dev,
 
 	if (adapter->ptp_clock)
 		info->phc_index = ptp_clock_index(adapter->ptp_clock);
-	else
-		info->phc_index = -1;
 
 	switch (adapter->hw.mac.type) {
 	case e1000_82575:
 		info->so_timestamping =
-			SOF_TIMESTAMPING_TX_SOFTWARE |
-			SOF_TIMESTAMPING_RX_SOFTWARE |
-			SOF_TIMESTAMPING_SOFTWARE;
+			SOF_TIMESTAMPING_TX_SOFTWARE;
 		return 0;
 	case e1000_82576:
 	case e1000_82580:
@@ -2405,8 +2401,6 @@ static int igb_get_ts_info(struct net_device *dev,
 	case e1000_i211:
 		info->so_timestamping =
 			SOF_TIMESTAMPING_TX_SOFTWARE |
-			SOF_TIMESTAMPING_RX_SOFTWARE |
-			SOF_TIMESTAMPING_SOFTWARE |
 			SOF_TIMESTAMPING_TX_HARDWARE |
 			SOF_TIMESTAMPING_RX_HARDWARE |
 			SOF_TIMESTAMPING_RAW_HARDWARE;