net: support time stamping in phy devices.

This patch adds a new networking option to allow hardware time stamps
from PHY devices. When enabled, likely candidates among incoming and
outgoing network packets are offered to the PHY driver for possible
time stamping. When accepted by the PHY driver, incoming packets are
deferred for later delivery by the driver.

The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl
and callbacks for transmit and receive time stamping. Drivers may
optionally implement these functions.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c4fedf000541..fdc3f2992230 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -54,6 +54,7 @@
 
 struct vlan_group;
 struct netpoll_info;
+struct phy_device;
 /* 802.11 specific */
 struct wireless_dev;
                                         /* source back-compat hooks */
@@ -1065,6 +1066,9 @@ struct net_device {
 #endif
         /* n-tuple filter list attached to this device */
         struct ethtool_rx_ntuple_list ethtool_ntuple_list;
+
+        /* phy device may attach itself for hardware timestamping */
+        struct phy_device *phydev;
 };
 #define to_net_dev(d) container_of(d, struct net_device, dev)