aio: don't include aio.h in sched.h
[linux-3.10.git] / net / core / timestamping.c
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
26 static struct sock_filter ptp_filter[] = {
27         PTP_FILTER
28 };
29
30 static 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
40 void 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 }
76 EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
77
78 void 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 }
102 EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
103
104 bool 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 }
134 EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
135
136 void __init skb_timestamping_init(void)
137 {
138         BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
139 }