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ptp: Add generic PTP is_sync() function

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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: Kurt Kanzenbach <kurt@linutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kurt Kanzenbach 2022-03-05 12:21:25 +01:00 committed by David S. Miller
parent 669b258a79
commit f72de02ebe
2 changed files with 27 additions and 0 deletions
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15
include/linux/ptp_classify.h
View File

@ -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_ */

12
net/core/ptp_classifier.c
View File

@ -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 = {