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net: dsa: no longer clone skb in core driver

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It was a waste to clone skb directly in dsa_skb_tx_timestamp().
For one-step timestamping, a clone was not needed. For any failure of
port_txtstamp (this may usually happen), the skb clone had to be freed.

So this patch moves skb cloning for tx timestamp out of dsa core, and
let drivers clone skb in port_txtstamp if they really need.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Tested-by: Kurt Kanzenbach <kurt@linutronix.de>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yangbo Lu
2021-04-27 12:21:59 +08:00
committed by David S. Miller
parent cf536ea3c7
commit 5c5416f5d4
9 changed files with 58 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
net/dsa/slave.c
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@@ -555,7 +555,6 @@ 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;
if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
return;
@@ -563,16 +562,7 @@ static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
if (!ds->ops->port_txtstamp)
return;
clone = skb_clone_sk(skb);
if (!clone)
return;
if (ds->ops->port_txtstamp(ds, p->dp->index, clone)) {
DSA_SKB_CB(skb)->clone = clone;
return;
}
kfree_skb(clone);
ds->ops->port_txtstamp(ds, p->dp->index, skb);
}
netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)