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net: dsa: don't call ptp_classify_raw() if switch doesn't provide RX timestamping

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ptp_classify_raw() is not exactly cheap, since it invokes a BPF program
for every skb in the receive path. For switches which do not provide
ds->ops->port_rxtstamp(), running ptp_classify_raw() provides precisely
nothing, so check for the presence of the function pointer first, since
that is much cheaper.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Link: https://lore.kernel.org/r/20221209175840.390707-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2022-12-09 19:58:40 +02:00 committed by Jakub Kicinski
parent cd2aafa25b
commit 8f18655c49
1 changed files with 4 additions and 4 deletions
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8
net/dsa/tag.c
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@ -33,6 +33,9 @@ static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
struct dsa_switch *ds = p->dp->ds;
unsigned int type;
if (!ds->ops->port_rxtstamp)
return false;
if (skb_headroom(skb) < ETH_HLEN)
return false;
@ -45,10 +48,7 @@ static bool dsa_skb_defer_rx_timestamp(struct dsa_slave_priv *p,
if (type == PTP_CLASS_NONE)
return false;
if (likely(ds->ops->port_rxtstamp))
return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
return false;
return ds->ops->port_rxtstamp(ds, p->dp->index, skb, type);
}
static int dsa_switch_rcv(struct sk_buff *skb, struct net_device *dev,