1 /* 2 * PTP 1588 clock support - support for timestamping in PHY devices 3 * 4 * Copyright (C) 2010 OMICRON electronics GmbH 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 #include <linux/errqueue.h> 21 #include <linux/phy.h> 22 #include <linux/ptp_classify.h> 23 #include <linux/skbuff.h> 24 #include <linux/export.h> 25 26 static unsigned int classify(const struct sk_buff *skb) 27 { 28 if (likely(skb->dev && skb->dev->phydev && 29 skb->dev->phydev->drv)) 30 return ptp_classify_raw(skb); 31 else 32 return PTP_CLASS_NONE; 33 } 34 35 void skb_clone_tx_timestamp(struct sk_buff *skb) 36 { 37 struct phy_device *phydev; 38 struct sk_buff *clone; 39 unsigned int type; 40 41 if (!skb->sk) 42 return; 43 44 type = classify(skb); 45 if (type == PTP_CLASS_NONE) 46 return; 47 48 phydev = skb->dev->phydev; 49 if (likely(phydev->drv->txtstamp)) { 50 clone = skb_clone_sk(skb); 51 if (!clone) 52 return; 53 phydev->drv->txtstamp(phydev, clone, type); 54 } 55 } 56 EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp); 57 58 bool skb_defer_rx_timestamp(struct sk_buff *skb) 59 { 60 struct phy_device *phydev; 61 unsigned int type; 62 63 if (skb_headroom(skb) < ETH_HLEN) 64 return false; 65 __skb_push(skb, ETH_HLEN); 66 67 type = classify(skb); 68 69 __skb_pull(skb, ETH_HLEN); 70 71 if (type == PTP_CLASS_NONE) 72 return false; 73 74 phydev = skb->dev->phydev; 75 if (likely(phydev->drv->rxtstamp)) 76 return phydev->drv->rxtstamp(phydev, skb, type); 77 78 return false; 79 } 80 EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp); 81