mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
1007f59dce
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>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/*
|
|
* PTP 1588 clock support - support for timestamping in PHY devices
|
|
*
|
|
* Copyright (C) 2010 OMICRON electronics GmbH
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <linux/errqueue.h>
|
|
#include <linux/phy.h>
|
|
#include <linux/ptp_classify.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/export.h>
|
|
|
|
static unsigned int classify(const struct sk_buff *skb)
|
|
{
|
|
if (likely(skb->dev && skb->dev->phydev &&
|
|
skb->dev->phydev->drv))
|
|
return ptp_classify_raw(skb);
|
|
else
|
|
return PTP_CLASS_NONE;
|
|
}
|
|
|
|
void skb_clone_tx_timestamp(struct sk_buff *skb)
|
|
{
|
|
struct phy_device *phydev;
|
|
struct sk_buff *clone;
|
|
unsigned int type;
|
|
|
|
if (!skb->sk)
|
|
return;
|
|
|
|
type = classify(skb);
|
|
if (type == PTP_CLASS_NONE)
|
|
return;
|
|
|
|
phydev = skb->dev->phydev;
|
|
if (likely(phydev->drv->txtstamp)) {
|
|
clone = skb_clone_sk(skb);
|
|
if (!clone)
|
|
return;
|
|
phydev->drv->txtstamp(phydev, clone, type);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
|
|
|
|
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 = ptp_classify_raw(skb);
|
|
|
|
__skb_pull(skb, ETH_HLEN);
|
|
|
|
if (type == PTP_CLASS_NONE)
|
|
return false;
|
|
|
|
phydev = skb->dev->phydev;
|
|
if (likely(phydev->drv->rxtstamp))
|
|
return phydev->drv->rxtstamp(phydev, skb, type);
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
|