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