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net: dsa: forward timestamping callbacks to switch drivers

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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>
This commit is contained in:
Brandon Streiff
2018-02-14 01:07:49 +01:00
committed by David S. Miller
parent 0336369d3a
commit 90af1059c5
3 changed files with 71 additions and 0 deletions
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30
net/dsa/slave.c
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@@ -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.
*/