[mirror_ubuntu-zesty-kernel.git] / net / core / timestamping.c

/*
 * PTP 1588 clock support - support for timestamping in PHY devices
 *
 * Copyright (C) 2010 OMICRON electronics GmbH
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/errqueue.h>
#include <linux/phy.h>
#include <linux/ptp_classify.h>
#include <linux/skbuff.h>

static struct sock_filter ptp_filter[] = {
	PTP_FILTER
};

static unsigned int classify(const struct sk_buff *skb)
{
	if (likely(skb->dev &&
		   skb->dev->phydev &&
		   skb->dev->phydev->drv))
		return sk_run_filter(skb, ptp_filter);
	else
		return PTP_CLASS_NONE;
}

void skb_clone_tx_timestamp(struct sk_buff *skb)
{
	struct phy_device *phydev;
	struct sk_buff *clone;
	struct sock *sk = skb->sk;
	unsigned int type;

	if (!sk)
		return;

	type = classify(skb);

	switch (type) {
	case PTP_CLASS_V1_IPV4:
	case PTP_CLASS_V1_IPV6:
	case PTP_CLASS_V2_IPV4:
	case PTP_CLASS_V2_IPV6:
	case PTP_CLASS_V2_L2:
	case PTP_CLASS_V2_VLAN:
		phydev = skb->dev->phydev;
		if (likely(phydev->drv->txtstamp)) {
			if (!atomic_inc_not_zero(&sk->sk_refcnt))
				return;
			clone = skb_clone(skb, GFP_ATOMIC);
			if (!clone) {
				sock_put(sk);
				return;
			}
			clone->sk = sk;
			phydev->drv->txtstamp(phydev, clone, type);
		}
		break;
	default:
		break;
	}
}
EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);

void skb_complete_tx_timestamp(struct sk_buff *skb,
			       struct skb_shared_hwtstamps *hwtstamps)
{
	struct sock *sk = skb->sk;
	struct sock_exterr_skb *serr;
	int err;

	if (!hwtstamps) {
		sock_put(sk);
		kfree_skb(skb);
		return;
	}

	*skb_hwtstamps(skb) = *hwtstamps;
	serr = SKB_EXT_ERR(skb);
	memset(serr, 0, sizeof(*serr));
	serr->ee.ee_errno = ENOMSG;
	serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
	skb->sk = NULL;
	err = sock_queue_err_skb(sk, skb);
	sock_put(sk);
	if (err)
		kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);

bool skb_defer_rx_timestamp(struct sk_buff *skb)
{
	struct phy_device *phydev;
	unsigned int type;

	if (skb_headroom(skb) < ETH_HLEN)
		return false;
	__skb_push(skb, ETH_HLEN);

	type = classify(skb);

	__skb_pull(skb, ETH_HLEN);

	switch (type) {
	case PTP_CLASS_V1_IPV4:
	case PTP_CLASS_V1_IPV6:
	case PTP_CLASS_V2_IPV4:
	case PTP_CLASS_V2_IPV6:
	case PTP_CLASS_V2_L2:
	case PTP_CLASS_V2_VLAN:
		phydev = skb->dev->phydev;
		if (likely(phydev->drv->rxtstamp))
			return phydev->drv->rxtstamp(phydev, skb, type);
		break;
	default:
		break;
	}

	return false;
}
EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);

void __init skb_timestamping_init(void)
{
	BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
}
Commit	Line	Data
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)) {
da92b194 RC	60	if (!atomic_inc_not_zero(&sk->sk_refcnt))
da92b194 RC	61	return;
c1f19b51	62	clone = skb_clone(skb, GFP_ATOMIC);
da92b194 RC	63	if (!clone) {
da92b194 RC	64	sock_put(sk);
c1f19b51	65	return;
da92b194	66	}
c1f19b51 RC	67	clone->sk = sk;
	68	phydev->drv->txtstamp(phydev, clone, type);
	69	}
	70	break;
	71	default:
	72	break;
	73	}
	74	}
1c17216e	75	EXPORT_SYMBOL_GPL(skb_clone_tx_timestamp);
c1f19b51 RC	76
	77	void skb_complete_tx_timestamp(struct sk_buff *skb,
	78	struct skb_shared_hwtstamps *hwtstamps)
	79	{
	80	struct sock *sk = skb->sk;
	81	struct sock_exterr_skb *serr;
	82	int err;
	83
da92b194 RC	84	if (!hwtstamps) {
	85	sock_put(sk);
	86	kfree_skb(skb);
c1f19b51	87	return;
da92b194	88	}
c1f19b51 RC	89
	90	skb_hwtstamps(skb) = hwtstamps;
	91	serr = SKB_EXT_ERR(skb);
	92	memset(serr, 0, sizeof(*serr));
	93	serr->ee.ee_errno = ENOMSG;
	94	serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
	95	skb->sk = NULL;
	96	err = sock_queue_err_skb(sk, skb);
da92b194	97	sock_put(sk);
c1f19b51 RC	98	if (err)
	99	kfree_skb(skb);
	100	}
	101	EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
	102
	103	bool skb_defer_rx_timestamp(struct sk_buff *skb)
	104	{
	105	struct phy_device *phydev;
	106	unsigned int type;
	107
a19faf02 ED	108	if (skb_headroom(skb) < ETH_HLEN)
	109	return false;
	110	__skb_push(skb, ETH_HLEN);
c1f19b51 RC	111
	112	type = classify(skb);
	113
a19faf02	114	__skb_pull(skb, ETH_HLEN);
c1f19b51 RC	115
	116	switch (type) {
	117	case PTP_CLASS_V1_IPV4:
	118	case PTP_CLASS_V1_IPV6:
	119	case PTP_CLASS_V2_IPV4:
	120	case PTP_CLASS_V2_IPV6:
	121	case PTP_CLASS_V2_L2:
	122	case PTP_CLASS_V2_VLAN:
	123	phydev = skb->dev->phydev;
	124	if (likely(phydev->drv->rxtstamp))
	125	return phydev->drv->rxtstamp(phydev, skb, type);
	126	break;
	127	default:
	128	break;
	129	}
	130
	131	return false;
	132	}
238442f6	133	EXPORT_SYMBOL_GPL(skb_defer_rx_timestamp);
c1f19b51 RC	134
	135	void __init skb_timestamping_init(void)
	136	{
	137	BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
	138	}