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net: skb_defer_rx_timestamp should check for phydev before setting up classify

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This change makes it so that the call skb_defer_rx_timestamp will first
check for a phydev before going in and manipulating the skb->data and
skb->len values.  By doing this we can avoid unnecessary work on network
devices that don't support phydev.  As a result we reduce the total
instruction count needed to process this on most devices.

Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexander Duyck 2015-07-09 11:02:52 -07:00 committed by David S. Miller
parent 2251ae46af
commit 1007f59dce
1 changed files with 5 additions and 1 deletions
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6
net/core/timestamping.c
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@ -60,11 +60,15 @@ bool skb_defer_rx_timestamp(struct sk_buff *skb)
struct phy_device *phydev;
unsigned int type;
if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->drv)
return false;
if (skb_headroom(skb) < ETH_HLEN)
return false;
__skb_push(skb, ETH_HLEN);
type = classify(skb);
type = ptp_classify_raw(skb);
__skb_pull(skb, ETH_HLEN);