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>
diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 935d93f..3376dad 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -21,6 +21,7 @@
#include <net/tc_act/tc_mirred.h>
#include <linux/if_bridge.h>
#include <linux/netpoll.h>
+#include <linux/ptp_classify.h>
#include "dsa_priv.h"
@@ -401,6 +402,30 @@ static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
return NETDEV_TX_OK;
}
+static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
+ struct sk_buff *skb)
+{
+ struct dsa_switch *ds = p->dp->ds;
+ struct sk_buff *clone;
+ unsigned int type;
+
+ type = ptp_classify_raw(skb);
+ if (type == PTP_CLASS_NONE)
+ return;
+
+ if (!ds->ops->port_txtstamp)
+ return;
+
+ clone = skb_clone_sk(skb);
+ if (!clone)
+ return;
+
+ if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
+ return;
+
+ kfree_skb(clone);
+}
+
static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct dsa_slave_priv *p = netdev_priv(dev);
@@ -413,6 +438,11 @@ static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
s->tx_bytes += skb->len;
u64_stats_update_end(&s->syncp);
+ /* Identify PTP protocol packets, clone them, and pass them to the
+ * switch driver
+ */
+ dsa_skb_tx_timestamp(p, skb);
+
/* Transmit function may have to reallocate the original SKB,
* in which case it must have freed it. Only free it here on error.
*/