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net: dsa: microchip: ptp: add packet reception timestamping

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Rx Timestamping is done through 4 additional bytes in tail tag.
Whenever the ptp packet is received, the 4 byte hardware time stamped
value is added before 1 byte tail tag. Also, bit 7 in tail tag indicates
it as PTP frame. This 4 byte value is extracted from the tail tag and
reconstructed to absolute time and assigned to skb hwtstamp.
If the packet received in PDelay_Resp, then partial ingress timestamp
is subtracted from the correction field. Since user space tools expects
to be done in hardware.

Signed-off-by: Christian Eggers <ceggers@arri.de>
Co-developed-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Signed-off-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christian Eggers
2023-01-10 14:19:24 +05:30
committed by David S. Miller
parent 2955762b37
commit 90188fff65
5 changed files with 108 additions and 6 deletions
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include/linux/dsa/ksz_common.h
+21
View File
@@ -9,10 +9,31 @@
#include <net/dsa.h>
/* All time stamps from the KSZ consist of 2 bits for seconds and 30 bits for
* nanoseconds. This is NOT the same as 32 bits for nanoseconds.
*/
#define KSZ_TSTAMP_SEC_MASK GENMASK(31, 30)
#define KSZ_TSTAMP_NSEC_MASK GENMASK(29, 0)
static inline ktime_t ksz_decode_tstamp(u32 tstamp)
{
u64 ns = FIELD_GET(KSZ_TSTAMP_SEC_MASK, tstamp) * NSEC_PER_SEC +
FIELD_GET(KSZ_TSTAMP_NSEC_MASK, tstamp);
return ns_to_ktime(ns);
}
struct ksz_tagger_data {
void (*hwtstamp_set_state)(struct dsa_switch *ds, bool on);
};
struct ksz_skb_cb {
u32 tstamp;
};
#define KSZ_SKB_CB(skb) \
((struct ksz_skb_cb *)((skb)->cb))
static inline struct ksz_tagger_data *
ksz_tagger_data(struct dsa_switch *ds)
{