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[v4,net-next,01/17] net: dsa: Keep a pointer to the skb clone for TX timestamping

Message ID 20190608120443.21889-2-olteanv@gmail.com
State Accepted
Delegated to: David Miller
Headers show
Series PTP support for the SJA1105 DSA driver | expand

Commit Message

Vladimir Oltean June 8, 2019, 12:04 p.m. UTC 
For drivers that use deferred_xmit for PTP frames (such as sja1105),
there is no need to perform matching between PTP frames and their egress
timestamps, since the sending process can be serialized.

In that case, it makes sense to have the pointer to the skb clone that
DSA made directly in the skb->cb. It will be used for pushing the egress
timestamp back in the application socket's error queue.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
Changes in v3:

None.

Changes in v3:

None.

Changes in v2:

Patch is new. Forgot to send in v1.

 net/dsa/slave.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 5bab82d46f0c..289a6aa4b51c 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -423,6 +423,8 @@  static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
 	if (!clone)
 		return;
 
+	DSA_SKB_CB(skb)->clone = clone;
+
 	if (ds->ops->port_txtstamp(ds, p->dp->index, clone, type))
 		return;
 
@@ -460,6 +462,7 @@  static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
 	u64_stats_update_end(&s->syncp);
 
 	DSA_SKB_CB(skb)->deferred_xmit = false;
+	DSA_SKB_CB(skb)->clone = NULL;
 
 	/* Identify PTP protocol packets, clone them, and pass them to the
 	 * switch driver