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gerrit-public.fairphone.software / kernel / msm / 01c64feac45cea1317263eabc4f7ee1b240f297f / . / net / core / timestamping.c
blob: 7e7ca375d4316e93d85482dacf0b5da951b5b12e [file] [log] [blame]
Richard Cochranc1f19b52010-07-17 08:49:36 +0000[diff] [blame]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
25static struct sock_filter ptp_filter[] = {
26 PTP_FILTER
27};
28
Eric Dumazet62ab0812010-12-06 20:50:09 +0000[diff] [blame]29static unsigned int classify(const struct sk_buff *skb)
Richard Cochranc1f19b52010-07-17 08:49:36 +0000[diff] [blame]30{
31 if (likely(skb->dev &&
32 skb->dev->phydev &&
33 skb->dev->phydev->drv))
Eric Dumazet93aaae22010-11-19 09:49:59 -0800[diff] [blame]34 return sk_run_filter(skb, ptp_filter);
Richard Cochranc1f19b52010-07-17 08:49:36 +0000[diff] [blame]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
Eric Dumazeta19faf02010-12-05 18:50:32 +0000[diff] [blame]99 if (skb_headroom(skb) < ETH_HLEN)
100 return false;
101 __skb_push(skb, ETH_HLEN);
Richard Cochranc1f19b52010-07-17 08:49:36 +0000[diff] [blame]102
103 type = classify(skb);
104
Eric Dumazeta19faf02010-12-05 18:50:32 +0000[diff] [blame]105 __skb_pull(skb, ETH_HLEN);
Richard Cochranc1f19b52010-07-17 08:49:36 +0000[diff] [blame]106
107 switch (type) {
108 case PTP_CLASS_V1_IPV4:
109 case PTP_CLASS_V1_IPV6:
110 case PTP_CLASS_V2_IPV4:
111 case PTP_CLASS_V2_IPV6:
112 case PTP_CLASS_V2_L2:
113 case PTP_CLASS_V2_VLAN:
114 phydev = skb->dev->phydev;
115 if (likely(phydev->drv->rxtstamp))
116 return phydev->drv->rxtstamp(phydev, skb, type);
117 break;
118 default:
119 break;
120 }
121
122 return false;
123}
124
125void __init skb_timestamping_init(void)
126{
127 BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
128}