mirror of https://gitee.com/openkylin/linux.git
140 lines
3.2 KiB
C
140 lines
3.2 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 struct sock_filter ptp_filter[] = {
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PTP_FILTER
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};
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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 &&
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skb->dev->phydev &&
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skb->dev->phydev->drv))
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return sk_run_filter(skb, ptp_filter);
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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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struct sock *sk = skb->sk;
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unsigned int type;
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if (!sk)
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return;
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type = classify(skb);
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switch (type) {
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case PTP_CLASS_V1_IPV4:
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case PTP_CLASS_V1_IPV6:
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case PTP_CLASS_V2_IPV4:
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case PTP_CLASS_V2_IPV6:
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case PTP_CLASS_V2_L2:
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case PTP_CLASS_V2_VLAN:
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phydev = skb->dev->phydev;
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if (likely(phydev->drv->txtstamp)) {
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if (!atomic_inc_not_zero(&sk->sk_refcnt))
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return;
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clone = skb_clone(skb, GFP_ATOMIC);
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if (!clone) {
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sock_put(sk);
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return;
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}
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clone->sk = sk;
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phydev->drv->txtstamp(phydev, clone, type);
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}
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break;
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default:
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break;
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}
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}
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EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
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void skb_complete_tx_timestamp(struct sk_buff *skb,
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struct skb_shared_hwtstamps *hwtstamps)
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{
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struct sock *sk = skb->sk;
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struct sock_exterr_skb *serr;
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int err;
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if (!hwtstamps) {
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sock_put(sk);
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kfree_skb(skb);
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return;
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}
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*skb_hwtstamps(skb) = *hwtstamps;
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serr = SKB_EXT_ERR(skb);
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memset(serr, 0, sizeof(*serr));
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serr->ee.ee_errno = ENOMSG;
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serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
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skb->sk = NULL;
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err = sock_queue_err_skb(sk, skb);
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sock_put(sk);
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if (err)
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kfree_skb(skb);
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}
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EXPORT_SYMBOL_GPL(skb_complete_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_headroom(skb) < ETH_HLEN)
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return false;
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__skb_push(skb, ETH_HLEN);
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type = classify(skb);
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__skb_pull(skb, ETH_HLEN);
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switch (type) {
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case PTP_CLASS_V1_IPV4:
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case PTP_CLASS_V1_IPV6:
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case PTP_CLASS_V2_IPV4:
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case PTP_CLASS_V2_IPV6:
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case PTP_CLASS_V2_L2:
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case PTP_CLASS_V2_VLAN:
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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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break;
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default:
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break;
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}
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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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void __init skb_timestamping_init(void)
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{
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BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
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}
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