Commit 146d442c authored Jun 08, 2019 by Vladimir Oltean Committed by David S. Miller Jun 08, 2019

net: dsa: Keep a pointer to the skb clone for TX timestamping



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>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a6cdeeb1

net/dsa/slave.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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

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