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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
13static 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
22void 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}
43EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
44
45bool 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}
71EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
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
26static struct sock_filter ptp_filter[] = {
27 PTP_FILTER
28};
29
30static unsigned int classify(const struct sk_buff *skb)
31{
32 if (likely(skb->dev &&
33 skb->dev->phydev &&
34 skb->dev->phydev->drv))
35 return sk_run_filter(skb, ptp_filter);
36 else
37 return PTP_CLASS_NONE;
38}
39
40void skb_clone_tx_timestamp(struct sk_buff *skb)
41{
42 struct phy_device *phydev;
43 struct sk_buff *clone;
44 struct sock *sk = skb->sk;
45 unsigned int type;
46
47 if (!sk)
48 return;
49
50 type = classify(skb);
51
52 switch (type) {
53 case PTP_CLASS_V1_IPV4:
54 case PTP_CLASS_V1_IPV6:
55 case PTP_CLASS_V2_IPV4:
56 case PTP_CLASS_V2_IPV6:
57 case PTP_CLASS_V2_L2:
58 case PTP_CLASS_V2_VLAN:
59 phydev = skb->dev->phydev;
60 if (likely(phydev->drv->txtstamp)) {
61 if (!atomic_inc_not_zero(&sk->sk_refcnt))
62 return;
63 clone = skb_clone(skb, GFP_ATOMIC);
64 if (!clone) {
65 sock_put(sk);
66 return;
67 }
68 clone->sk = sk;
69 phydev->drv->txtstamp(phydev, clone, type);
70 }
71 break;
72 default:
73 break;
74 }
75}
76EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
77
78void skb_complete_tx_timestamp(struct sk_buff *skb,
79 struct skb_shared_hwtstamps *hwtstamps)
80{
81 struct sock *sk = skb->sk;
82 struct sock_exterr_skb *serr;
83 int err;
84
85 if (!hwtstamps) {
86 sock_put(sk);
87 kfree_skb(skb);
88 return;
89 }
90
91 *skb_hwtstamps(skb) = *hwtstamps;
92 serr = SKB_EXT_ERR(skb);
93 memset(serr, 0, sizeof(*serr));
94 serr->ee.ee_errno = ENOMSG;
95 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
96 skb->sk = NULL;
97 err = sock_queue_err_skb(sk, skb);
98 sock_put(sk);
99 if (err)
100 kfree_skb(skb);
101}
102EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
103
104bool skb_defer_rx_timestamp(struct sk_buff *skb)
105{
106 struct phy_device *phydev;
107 unsigned int type;
108
109 if (skb_headroom(skb) < ETH_HLEN)
110 return false;
111 __skb_push(skb, ETH_HLEN);
112
113 type = classify(skb);
114
115 __skb_pull(skb, ETH_HLEN);
116
117 switch (type) {
118 case PTP_CLASS_V1_IPV4:
119 case PTP_CLASS_V1_IPV6:
120 case PTP_CLASS_V2_IPV4:
121 case PTP_CLASS_V2_IPV6:
122 case PTP_CLASS_V2_L2:
123 case PTP_CLASS_V2_VLAN:
124 phydev = skb->dev->phydev;
125 if (likely(phydev->drv->rxtstamp))
126 return phydev->drv->rxtstamp(phydev, skb, type);
127 break;
128 default:
129 break;
130 }
131
132 return false;
133}
134EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
135
136void __init skb_timestamping_init(void)
137{
138 BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
139}