| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
|---|---|
| 2 | /* |
| 3 | * PTP 1588 clock support - support for timestamping in PHY devices |
| 4 | * |
| 5 | * Copyright (C) 2010 OMICRON electronics GmbH |
| 6 | */ |
| 7 | #include <linux/errqueue.h> |
| 8 | #include <linux/phy.h> |
| 9 | #include <linux/ptp_classify.h> |
| 10 | #include <linux/skbuff.h> |
| 11 | #include <linux/export.h> |
| 12 | |
| 13 | static unsigned int classify(const struct sk_buff *skb) |
| 14 | { |
| 15 | if (likely(skb->dev && skb->dev->phydev && |
| 16 | skb->dev->phydev->mii_ts)) |
| 17 | return ptp_classify_raw(skb); |
| 18 | else |
| 19 | return PTP_CLASS_NONE; |
| 20 | } |
| 21 | |
| 22 | void skb_clone_tx_timestamp(struct sk_buff *skb) |
| 23 | { |
| 24 | struct mii_timestamper *mii_ts; |
| 25 | struct sk_buff *clone; |
| 26 | unsigned int type; |
| 27 | |
| 28 | if (!skb->sk) |
| 29 | return; |
| 30 | |
| 31 | type = classify(skb); |
| 32 | if (type == PTP_CLASS_NONE) |
| 33 | return; |
| 34 | |
| 35 | mii_ts = skb->dev->phydev->mii_ts; |
| 36 | if (likely(mii_ts->txtstamp)) { |
| 37 | clone = skb_clone_sk(skb); |
| 38 | if (!clone) |
| 39 | return; |
| 40 | mii_ts->txtstamp(mii_ts, clone, type); |
| 41 | } |
| 42 | } |
| 43 | EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp); |
| 44 | |
| 45 | bool skb_defer_rx_timestamp(struct sk_buff *skb) |
| 46 | { |
| 47 | struct mii_timestamper *mii_ts; |
| 48 | unsigned int type; |
| 49 | |
| 50 | if (!skb->dev || !skb->dev->phydev || !skb->dev->phydev->mii_ts) |
| 51 | return false; |
| 52 | |
| 53 | if (skb_headroom(skb) < ETH_HLEN) |
| 54 | return false; |
| 55 | |
| 56 | __skb_push(skb, ETH_HLEN); |
| 57 | |
| 58 | type = ptp_classify_raw(skb); |
| 59 | |
| 60 | __skb_pull(skb, ETH_HLEN); |
| 61 | |
| 62 | if (type == PTP_CLASS_NONE) |
| 63 | return false; |
| 64 | |
| 65 | mii_ts = skb->dev->phydev->mii_ts; |
| 66 | if (likely(mii_ts->rxtstamp)) |
| 67 | return mii_ts->rxtstamp(mii_ts, skb, type); |
| 68 | |
| 69 | return false; |
| 70 | } |
| 71 | EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp); |
| 72 |