diff options
| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2022-12-09 20:58:40 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-12-13 02:03:21 +0300 |
| commit | 8f18655c49eb6abfe7fc3711d32d23b311fbc6a6 (patch) | |
| tree | b6d197aa3735d037b53e19618956672d6f6adc47 /net/dsa | |
| parent | cd2aafa25b94b4d7f46fbae0bf58701689db296b (diff) | |
| download | linux-8f18655c49eb6abfe7fc3711d32d23b311fbc6a6.tar.xz | |
net: dsa: don't call ptp_classify_raw() if switch doesn't provide RX timestamping
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>
Diffstat (limited to 'net/dsa')
| -rw-r--r-- | net/dsa/tag.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/dsa/tag.c b/net/dsa/tag.c index 383721e167d6..b2fba1a003ce 100644 --- a/net/dsa/tag.c +++ b/net/dsa/tag.c @@ -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, |