Commit f72de02e authored by Kurt Kanzenbach's avatar Kurt Kanzenbach Committed by David S. Miller
Browse files

ptp: Add generic PTP is_sync() function 



PHY drivers such as micrel or dp83640 need to analyze whether a given
skb is a PTP sync message for one step functionality.

In order to avoid code duplication introduce a generic function and
move it to ptp classify.

Signed-off-by: default avatarKurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 669b258a

include/linux/ptp_classify.h

+15 −0
Original line number Diff line number Diff line
@@ -126,6 +126,17 @@ static inline u8 ptp_get_msgtype(const struct ptp_header *hdr, 
	return msgtype;

}



/**

 * ptp_msg_is_sync - Evaluates whether the given skb is a PTP Sync message

 * @skb: packet buffer

 * @type: type of the packet (see ptp_classify_raw())

 *

 * This function evaluates whether the given skb is a PTP Sync message.

 *

 * Return: true if sync message, false otherwise

 */

bool ptp_msg_is_sync(struct sk_buff *skb, unsigned int type);



void __init ptp_classifier_init(void);

#else

static inline void ptp_classifier_init(void)
@@ -148,5 +159,9 @@ static inline u8 ptp_get_msgtype(const struct ptp_header *hdr, 
	 */

	return PTP_MSGTYPE_SYNC;

}

static inline bool ptp_msg_is_sync(struct sk_buff *skb, unsigned int type)

{

	return false;

}

#endif

#endif /* _PTP_CLASSIFY_H_ */

net/core/ptp_classifier.c

+12 −0
Original line number Diff line number Diff line
@@ -137,6 +137,18 @@ struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type) 
}

EXPORT_SYMBOL_GPL(ptp_parse_header);



bool ptp_msg_is_sync(struct sk_buff *skb, unsigned int type)

{

	struct ptp_header *hdr;



	hdr = ptp_parse_header(skb, type);

	if (!hdr)

		return false;



	return ptp_get_msgtype(hdr, type) == PTP_MSGTYPE_SYNC;

}

EXPORT_SYMBOL_GPL(ptp_msg_is_sync);



void __init ptp_classifier_init(void)

{

	static struct sock_filter ptp_filter[] __initdata = {