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authorChristian Eggers <ceggers@arri.de>2023-01-10 11:49:24 +0300
committerDavid S. Miller <davem@davemloft.net>2023-01-13 11:40:41 +0300
commit90188fff655d8efad79acdf60c3012ffcbbef716 (patch)
treeba4f788ba0e8de376ca8f9614880c9db4b161435 /include/linux/dsa/ksz_common.h
parent2955762b372b791a8f4cd862cf0b5fef9c456449 (diff)
downloadlinux-90188fff655d8efad79acdf60c3012ffcbbef716.tar.xz
net: dsa: microchip: ptp: add packet reception timestamping
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>
Diffstat (limited to 'include/linux/dsa/ksz_common.h')
-rw-r--r--include/linux/dsa/ksz_common.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/dsa/ksz_common.h b/include/linux/dsa/ksz_common.h
index d2a54161be97..a256b08d837d 100644
--- a/include/linux/dsa/ksz_common.h
+++ b/include/linux/dsa/ksz_common.h
@@ -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)
{