igc: Add support for PTP .getcyclesx64()

Add support for using Timer 1 (i225/i226 have 4 timer registers) as a
free-running clock (the "cycles" clock) in addition to Timer 0 (the
default, "adjustable clock"). The objective is to allow taprio/etf
offloading to coexist with PTP vclocks.

Besides the implementation of .getcyclesx64() for i225/i226, to keep
timestamping working when vclocks are in use, we also need to add
support for TX and RX timestamping using the free running timer, when
the requesting socket is bound to a vclock.

On the RX side, i225/i226 can be configured to store the values of two
timers in the received packet metadata area, so it's a matter of
configuring the right registers and retrieving the right timestamp.

The TX is a bit more involved because the hardware stores a single
timestamp (with the selected timer in the TX descriptor) into one of
the timestamp registers.

Note some changes at how the timestamps are done for RX, the
conversion and adjustment of timestamps are now done closer to the
consumption of the timestamp instead of near the reception.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_defines.h b/drivers/net/ethernet/intel/igc/igc_defines.h
index b3037016f31d..5f92b3c7c3d4 100644
--- a/drivers/net/ethernet/intel/igc/igc_defines.h
+++ b/drivers/net/ethernet/intel/igc/igc_defines.h
@@ -317,6 +317,8 @@
 #define IGC_TXD_CMD_TSE		0x04000000 /* TCP Seg enable */
 #define IGC_TXD_EXTCMD_TSTAMP	0x00000010 /* IEEE1588 Timestamp packet */
 
+#define IGC_TXD_PTP2_TIMER_1	0x00000020
+
 /* IPSec Encrypt Enable */
 #define IGC_ADVTXD_L4LEN_SHIFT	8  /* Adv ctxt L4LEN shift */
 #define IGC_ADVTXD_MSS_SHIFT	16 /* Adv ctxt MSS shift */