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2dd3560059
Change the API to select MAC default time stamping instead of the PHY. Indeed the PHY is closer to the wire therefore theoretically it has less delay than the MAC timestamping but the reality is different. Due to lower time stamping clock frequency, latency in the MDIO bus and no PHC hardware synchronization between different PHY, the PHY PTP is often less precise than the MAC. The exception is for PHY designed specially for PTP case but these devices are not very widespread. For not breaking the compatibility default_timestamp flag has been introduced in phy_device that is set by the phy driver to know we are using the old API behavior. Reviewed-by: Rahul Rameshbabu <rrameshbabu@nvidia.com> Signed-off-by: Kory Maincent <kory.maincent@bootlin.com> Link: https://patch.msgid.link/20240709-feature_ptp_netnext-v17-4-b5317f50df2a@bootlin.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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->mii_ts))
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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 mii_timestamper *mii_ts;
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struct sk_buff *clone;
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unsigned int type;
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if (!skb->sk || !skb->dev ||
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!phy_is_default_hwtstamp(skb->dev->phydev))
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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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mii_ts = skb->dev->phydev->mii_ts;
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if (likely(mii_ts->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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mii_ts->txtstamp(mii_ts, 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 mii_timestamper *mii_ts;
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unsigned int type;
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if (!skb->dev || !phy_is_default_hwtstamp(skb->dev->phydev))
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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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mii_ts = skb->dev->phydev->mii_ts;
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if (likely(mii_ts->rxtstamp))
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return mii_ts->rxtstamp(mii_ts, 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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