blob: 0ae6c22da85b2a3516980691c8fbcf2f7228e3d6 [file] [log] [blame]
Richard Cochranc1f19b52010-07-17 08:49:36 +00001/*
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
25static struct sock_filter ptp_filter[] = {
26 PTP_FILTER
27};
28
29static unsigned int classify(struct sk_buff *skb)
30{
31 if (likely(skb->dev &&
32 skb->dev->phydev &&
33 skb->dev->phydev->drv))
34 return sk_run_filter(skb, ptp_filter, ARRAY_SIZE(ptp_filter));
35 else
36 return PTP_CLASS_NONE;
37}
38
39void skb_clone_tx_timestamp(struct sk_buff *skb)
40{
41 struct phy_device *phydev;
42 struct sk_buff *clone;
43 struct sock *sk = skb->sk;
44 unsigned int type;
45
46 if (!sk)
47 return;
48
49 type = classify(skb);
50
51 switch (type) {
52 case PTP_CLASS_V1_IPV4:
53 case PTP_CLASS_V1_IPV6:
54 case PTP_CLASS_V2_IPV4:
55 case PTP_CLASS_V2_IPV6:
56 case PTP_CLASS_V2_L2:
57 case PTP_CLASS_V2_VLAN:
58 phydev = skb->dev->phydev;
59 if (likely(phydev->drv->txtstamp)) {
60 clone = skb_clone(skb, GFP_ATOMIC);
61 if (!clone)
62 return;
63 clone->sk = sk;
64 phydev->drv->txtstamp(phydev, clone, type);
65 }
66 break;
67 default:
68 break;
69 }
70}
71
72void skb_complete_tx_timestamp(struct sk_buff *skb,
73 struct skb_shared_hwtstamps *hwtstamps)
74{
75 struct sock *sk = skb->sk;
76 struct sock_exterr_skb *serr;
77 int err;
78
79 if (!hwtstamps)
80 return;
81
82 *skb_hwtstamps(skb) = *hwtstamps;
83 serr = SKB_EXT_ERR(skb);
84 memset(serr, 0, sizeof(*serr));
85 serr->ee.ee_errno = ENOMSG;
86 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
87 skb->sk = NULL;
88 err = sock_queue_err_skb(sk, skb);
89 if (err)
90 kfree_skb(skb);
91}
92EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
93
94bool skb_defer_rx_timestamp(struct sk_buff *skb)
95{
96 struct phy_device *phydev;
97 unsigned int type;
98
99 skb_push(skb, ETH_HLEN);
100
101 type = classify(skb);
102
103 skb_pull(skb, ETH_HLEN);
104
105 switch (type) {
106 case PTP_CLASS_V1_IPV4:
107 case PTP_CLASS_V1_IPV6:
108 case PTP_CLASS_V2_IPV4:
109 case PTP_CLASS_V2_IPV6:
110 case PTP_CLASS_V2_L2:
111 case PTP_CLASS_V2_VLAN:
112 phydev = skb->dev->phydev;
113 if (likely(phydev->drv->rxtstamp))
114 return phydev->drv->rxtstamp(phydev, skb, type);
115 break;
116 default:
117 break;
118 }
119
120 return false;
121}
122
123void __init skb_timestamping_init(void)
124{
125 BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
126}