igb: stub support for SIOCSHWTSTAMP

Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/igb/igb_main.c

@@ -34,6 +34,7 @@
 #include <linux/ipv6.h>
 #include <net/checksum.h>
 #include <net/ip6_checksum.h>
+#include <linux/net_tstamp.h>
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/if_vlan.h>
@@ -4181,6 +4182,34 @@ static int igb_mii_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 	return 0;
 }
 
+/**
+ * igb_hwtstamp_ioctl - control hardware time stamping
+ * @netdev:
+ * @ifreq:
+ * @cmd:
+ *
+ * Currently cannot enable any kind of hardware time stamping, but
+ * supports SIOCSHWTSTAMP in general.
+ **/
+static int igb_hwtstamp_ioctl(struct net_device *netdev,
+			      struct ifreq *ifr, int cmd)
+{
+	struct hwtstamp_config config;
+
+	if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
+		return -EFAULT;
+
+	/* reserved for future extensions */
+	if (config.flags)
+		return -EINVAL;
+
+	if (config.tx_type == HWTSTAMP_TX_OFF &&
+		config.rx_filter == HWTSTAMP_FILTER_NONE)
+		return 0;
+
+	return -ERANGE;
+}
+
 /**
  * igb_ioctl -
  * @netdev:
@@ -4194,6 +4223,8 @@ static int igb_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 	case SIOCGMIIREG:
 	case SIOCSMIIREG:
 		return igb_mii_ioctl(netdev, ifr, cmd);
+	case SIOCSHWTSTAMP:
+		return igb_hwtstamp_ioctl(netdev, ifr, cmd);
 	default:
 		return -EOPNOTSUPP;
 	}