[PATCH iwl-next] ice: add rx timestamp tracepoint for debugging

[Przemyslaw Korba <przemyslaw.korba@intel.com>]

Add ice_rx_hwtstamp trace event to help debug PTP rx timestamp issues.
The trace captures cached_time, ts_high, and the extended ts_ns value in
ice_ptp_get_rx_hwts().

Enable with:
echo 1 > /sys/kernel/debug/tracing/events/ice/ice_rx_hwtstamp/enable
cat /sys/kernel/debug/tracing/trace_pipe

Signed-off-by: Przemyslaw Korba <przemyslaw.korba@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ptp.c   |  2 ++
 drivers/net/ethernet/intel/ice/ice_trace.h | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_ptp.c b/drivers/net/ethernet/intel/ice/ice_ptp.c
index 691f05c62d4e..07e621813ff5 100644
--- a/drivers/net/ethernet/intel/ice/ice_ptp.c
+++ b/drivers/net/ethernet/intel/ice/ice_ptp.c
@@ -2333,6 +2333,8 @@ u64 ice_ptp_get_rx_hwts(const union ice_32b_rx_flex_desc *rx_desc,
 	ts_high = le32_to_cpu(rx_desc->wb.flex_ts.ts_high);
 	ts_ns = ice_ptp_extend_32b_ts(cached_time, ts_high);
 
+	ice_trace(rx_hwtstamp, cached_time, ts_high, ts_ns);
+
 	return ts_ns;
 }
 
diff --git a/drivers/net/ethernet/intel/ice/ice_trace.h b/drivers/net/ethernet/intel/ice/ice_trace.h
index 4f35ef8d6b29..3cb8c6ea03cf 100644
--- a/drivers/net/ethernet/intel/ice/ice_trace.h
+++ b/drivers/net/ethernet/intel/ice/ice_trace.h
@@ -241,6 +241,24 @@ DEFINE_TX_TSTAMP_OP_EVENT(ice_tx_tstamp_fw_req);
 DEFINE_TX_TSTAMP_OP_EVENT(ice_tx_tstamp_fw_done);
 DEFINE_TX_TSTAMP_OP_EVENT(ice_tx_tstamp_complete);
 
+/* Trace event for Rx timestamp */
+TRACE_EVENT(ice_rx_hwtstamp,
+	    TP_PROTO(u64 cached_time, u32 ts_high, u64 ts_ns),
+
+	    TP_ARGS(cached_time, ts_high, ts_ns),
+
+	    TP_STRUCT__entry(__field(u64, cached_time)
+			     __field(u32, ts_high)
+			     __field(u64, ts_ns)),
+
+	    TP_fast_assign(__entry->cached_time = cached_time;
+			   __entry->ts_high = ts_high;
+			   __entry->ts_ns = ts_ns;),
+
+	    TP_printk("cached_time=%llu ts_high=%u ts_ns=%llu",
+		      __entry->cached_time, __entry->ts_high, __entry->ts_ns)
+);
+
 DECLARE_EVENT_CLASS(ice_esw_br_fdb_template,
 		    TP_PROTO(struct ice_esw_br_fdb_entry *fdb),
 		    TP_ARGS(fdb),

base-commit: 5c0d2ac5900d689d422a31cd45073175150c0a39
-- 
2.43.0