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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> | |
24 | ||
25 | static struct sock_filter ptp_filter[] = { | |
26 | PTP_FILTER | |
27 | }; | |
28 | ||
62ab0812 | 29 | static unsigned int classify(const struct sk_buff *skb) |
c1f19b51 RC |
30 | { |
31 | if (likely(skb->dev && | |
32 | skb->dev->phydev && | |
33 | skb->dev->phydev->drv)) | |
93aaae2e | 34 | return sk_run_filter(skb, ptp_filter); |
c1f19b51 RC |
35 | else |
36 | return PTP_CLASS_NONE; | |
37 | } | |
38 | ||
39 | void 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 | ||
72 | void 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 | } | |
92 | EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp); | |
93 | ||
94 | bool skb_defer_rx_timestamp(struct sk_buff *skb) | |
95 | { | |
96 | struct phy_device *phydev; | |
97 | unsigned int type; | |
98 | ||
a19faf02 ED |
99 | if (skb_headroom(skb) < ETH_HLEN) |
100 | return false; | |
101 | __skb_push(skb, ETH_HLEN); | |
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102 | |
103 | type = classify(skb); | |
104 | ||
a19faf02 | 105 | __skb_pull(skb, ETH_HLEN); |
c1f19b51 RC |
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 | ||
125 | void __init skb_timestamping_init(void) | |
126 | { | |
127 | BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter))); | |
128 | } |