net: dsa: forward timestamping callbacks to switch drivers

Forward the rx/tx timestamp machinery from the dsa infrastructure to the
switch driver.

On the rx side, defer delivery of skbs until we have an rx timestamp.
This mimicks the behavior of skb_defer_rx_timestamp.

On the tx side, identify PTP packets, clone them, and pass them to the
underlying switch driver before we transmit. This mimicks the behavior
of skb_tx_timestamp.

Adjusted txstamp API to keep the allocation and freeing of the clone
in the same central function by Richard Cochran

Signed-off-by: Brandon Streiff <brandon.streiff@ni.com>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 4c0df83dddaf..0ad17b63684d 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -102,6 +102,7 @@ struct dsa_platform_data {
 };
 
 struct packet_type;
+struct dsa_switch;
 
 struct dsa_device_ops {
         struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
@@ -484,6 +485,10 @@ struct dsa_switch_ops {
                                      struct ifreq *ifr);
         int     (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
                                      struct ifreq *ifr);
+        bool    (*port_txtstamp)(struct dsa_switch *ds, int port,
+                                 struct sk_buff *clone, unsigned int type);
+        bool    (*port_rxtstamp)(struct dsa_switch *ds, int port,
+                                 struct sk_buff *skb, unsigned int type);
 };
 
 struct dsa_switch_driver {