netdev - [PATCH 4/6] ptp: add api to get ptp seq id and event type from skb

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Message-ID: <1350427518-7230-5-git-send-email-mugunthanvnm@ti.com>
Date:	Wed, 17 Oct 2012 04:15:16 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	<netdev@...r.kernel.org>
CC:	<davem@...emloft.net>, Richard Cochran <richardcochran@...il.com>,
	Mugunthan V N <mugunthanvnm@...com>
Subject: [PATCH 4/6] ptp: add api to get ptp seq id and event type from skb

Cc: Richard Cochran <richardcochran@...il.com>
Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
---
 include/linux/ptp_classify.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/include/linux/ptp_classify.h b/include/linux/ptp_classify.h
index 1dc420b..9b3b55b 100644
--- a/include/linux/ptp_classify.h
+++ b/include/linux/ptp_classify.h
@@ -137,4 +137,46 @@ static inline int ptp_filter_init(struct sock_filter *f, int len)
 	{OP_RETA,	0,   0, 0			}, /*              */ \
 /*L6x*/	{OP_RETK,	0,   0, PTP_CLASS_NONE		},
 
+static inline int ptp_get_skb_event(struct sk_buff *skb, u32 ptp_class,
+				    u16 *evt_seqid, u8 *evt_msgtype)
+{
+	u16 *seqid;
+	unsigned int offset;
+	u8 *msgtype, *data = skb->data;
+
+	switch (ptp_class) {
+	case PTP_CLASS_V1_IPV4:
+	case PTP_CLASS_V2_IPV4:
+		offset = ETH_HLEN + IPV4_HLEN(data) + UDP_HLEN;
+		break;
+	case PTP_CLASS_V1_IPV6:
+	case PTP_CLASS_V2_IPV6:
+		offset = OFF_PTP6;
+		break;
+	case PTP_CLASS_V2_L2:
+		offset = ETH_HLEN;
+		break;
+	case PTP_CLASS_V2_VLAN:
+		offset = ETH_HLEN + VLAN_HLEN;
+		break;
+	default:
+		return 0;
+	}
+
+	if (skb->len + ETH_HLEN < offset + OFF_PTP_SEQUENCE_ID + sizeof(*seqid))
+		return 0;
+
+	if (unlikely(ptp_class & PTP_CLASS_V1))
+		msgtype = data + offset + OFF_PTP_CONTROL;
+	else
+		msgtype = data + offset;
+
+	seqid = (u16 *)(data + offset + OFF_PTP_SEQUENCE_ID);
+
+	*evt_seqid = ntohs(*seqid);
+	*evt_msgtype = *msgtype & 0xf;
+
+	return 0;
+}
+
 #endif
-- 
1.7.0.4

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