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

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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>
This commit is contained in:
Vladimir Oltean 2019-06-08 15:04:27 +03:00 committed by David S. Miller
parent a6cdeeb16b
commit 146d442c23
1 changed files with 3 additions and 0 deletions
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3
net/dsa/slave.c
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@ -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