projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c1f19b51 RC |
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> | |
| bc3b2d7f | 24 | #include <linux/export.h> |
| c1f19b51 | 25 | |
| 62ab0812 | 26 | static unsigned int classify(const struct sk_buff *skb) |
| c1f19b51 | 27 | { |
| e62d2df0 | 28 | if (likely(skb->dev && skb->dev->phydev && |
| c1f19b51 | 29 | skb->dev->phydev->drv)) |
| 164d8c66 | 30 | return ptp_classify_raw(skb); |
| c1f19b51 RC |
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 | struct sock *sk = skb->sk; | |
| 40 | unsigned int type; | |
| 41 | ||
| 42 | if (!sk) | |
| 43 | return; | |
| 44 | ||
| 45 | type = classify(skb); | |
| b9c701ed SS |
46 | if (type == PTP_CLASS_NONE) |
| 47 | return; | |
| 48 | ||
| 49 | phydev = skb->dev->phydev; | |
| 50 | if (likely(phydev->drv->txtstamp)) { | |
| 51 | if (!atomic_inc_not_zero(&sk->sk_refcnt)) | |
| 52 | return; | |
| c1f19b51 | 53 | |
| b9c701ed SS |
54 | clone = skb_clone(skb, GFP_ATOMIC); |
| 55 | if (!clone) { | |
| 56 | sock_put(sk); | |
| 57 | return; | |
| c1f19b51 | 58 | } |
| b9c701ed SS |
59 | |
| 60 | clone->sk = sk; | |
| 61 | phydev->drv->txtstamp(phydev, clone, type); | |
| c1f19b51 RC |
62 | } |
| 63 | } | |
| 1c17216e | 64 | EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp); |
| c1f19b51 RC |
65 | |
| 66 | void skb_complete_tx_timestamp(struct sk_buff *skb, | |
| 67 | struct skb_shared_hwtstamps *hwtstamps) | |
| 68 | { | |
| 69 | struct sock *sk = skb->sk; | |
| 70 | struct sock_exterr_skb *serr; | |
| 71 | int err; | |
| 72 | ||
| da92b194 RC |
73 | if (!hwtstamps) { |
| 74 | sock_put(sk); | |
| 75 | kfree_skb(skb); | |
| c1f19b51 | 76 | return; |
| da92b194 | 77 | } |
| c1f19b51 RC |
78 | |
| 79 | *skb_hwtstamps(skb) = *hwtstamps; | |
| e62d2df0 | 80 | |
| c1f19b51 RC |
81 | serr = SKB_EXT_ERR(skb); |
| 82 | memset(serr, 0, sizeof(*serr)); | |
| 83 | serr->ee.ee_errno = ENOMSG; | |
| 84 | serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING; | |
| 85 | skb->sk = NULL; | |
| e62d2df0 | 86 | |
| c1f19b51 | 87 | err = sock_queue_err_skb(sk, skb); |
| e62d2df0 | 88 | |
| da92b194 | 89 | sock_put(sk); |
| c1f19b51 RC |
90 | if (err) |
| 91 | kfree_skb(skb); | |
| 92 | } | |
| 93 | EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp); | |
| 94 | ||
| 95 | bool skb_defer_rx_timestamp(struct sk_buff *skb) | |
| 96 | { | |
| 97 | struct phy_device *phydev; | |
| 98 | unsigned int type; | |
| 99 | ||
| a19faf02 ED |
100 | if (skb_headroom(skb) < ETH_HLEN) |
| 101 | return false; | |
| 102 | __skb_push(skb, ETH_HLEN); | |
| c1f19b51 RC |
103 | |
| 104 | type = classify(skb); | |
| 105 | ||
| a19faf02 | 106 | __skb_pull(skb, ETH_HLEN); |
| c1f19b51 | 107 | |
| b9c701ed SS |
108 | if (type == PTP_CLASS_NONE) |
| 109 | return false; | |
| 110 | ||
| 111 | phydev = skb->dev->phydev; | |
| 112 | if (likely(phydev->drv->rxtstamp)) | |
| 113 | return phydev->drv->rxtstamp(phydev, skb, type); | |
| c1f19b51 RC |
114 | |
| 115 | return false; | |
| 116 | } | |
| 238442f6 | 117 | EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp); |