igc: Fix wrong timestamp latency numbers

[ Upstream commit f03369b9bfab8e23ac28ca7ab7e6631c374b7cbe ]

The previous timestamping latency numbers were obtained by
interpolating the i210 numbers with the i225 crystal clock value. That
calculation was wrong.

Use the correct values from real measurements.

Fixes: 81b055205e8b ("igc: Add support for RX timestamping")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h
index 5dbc5a156626af47abc4755ec424fad29a30ced8..206b73aa6d7a7e1704dd6a2ef296414d9632ec86 100644 (file)
--- a/drivers/net/ethernet/intel/igc/igc.h
+++ b/drivers/net/ethernet/intel/igc/igc.h
@@ -298,18 +298,14 @@ extern char igc_driver_version[];
 #define IGC_RX_HDR_LEN                 IGC_RXBUFFER_256
 
 /* Transmit and receive latency (for PTP timestamps) */
-/* FIXME: These values were estimated using the ones that i225 has as
- * basis, they seem to provide good numbers with ptp4l/phc2sys, but we
- * need to confirm them.
- */
-#define IGC_I225_TX_LATENCY_10         9542
-#define IGC_I225_TX_LATENCY_100                1024
-#define IGC_I225_TX_LATENCY_1000       178
-#define IGC_I225_TX_LATENCY_2500       64
-#define IGC_I225_RX_LATENCY_10         20662
-#define IGC_I225_RX_LATENCY_100                2213
-#define IGC_I225_RX_LATENCY_1000       448
-#define IGC_I225_RX_LATENCY_2500       160
+#define IGC_I225_TX_LATENCY_10         240
+#define IGC_I225_TX_LATENCY_100                58
+#define IGC_I225_TX_LATENCY_1000       80
+#define IGC_I225_TX_LATENCY_2500       1325
+#define IGC_I225_RX_LATENCY_10         6450
+#define IGC_I225_RX_LATENCY_100                185
+#define IGC_I225_RX_LATENCY_1000       300
+#define IGC_I225_RX_LATENCY_2500       1485
 
 /* RX and TX descriptor control thresholds.
  * PTHRESH - MAC will consider prefetch if it has fewer than this number of