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Viewing changes to net/core/timestamping.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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net/core/timestamping.c
 
1
/*
 
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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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        }
 
131
 
 
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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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}