enetc: add hardware timestamping support

This patch is to add hardware timestamping support
for ENETC. On Rx, timestamping is enabled for all
frames. On Tx, we only instruct the hardware to
timestamp the frames marked accordingly by the stack.

Because the RX BD ring dynamic allocation has not been
supported and it is too expensive to use extended RX BDs
if timestamping is not used, a Kconfig option is used to
enable extended RX BDs in order to support hardware
timestamping. This option will be removed once RX BD
ring dynamic allocation is implemented.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_hw.h b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
index df8eb8882d92..6559cef4b07d 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_hw.h
+++ b/drivers/net/ethernet/freescale/enetc/enetc_hw.h
@@ -361,6 +361,12 @@ union enetc_tx_bd {
 		u8 e_flags;
 		u8 flags;
 	} ext; /* Tx BD extension */
+	struct {
+		__le32 tstamp;
+		u8 reserved[10];
+		u8 status;
+		u8 flags;
+	} wb; /* writeback descriptor */
 };
 
 #define ENETC_TXBD_FLAGS_L4CS	BIT(0)
@@ -399,6 +405,9 @@ union enetc_rx_bd {
 	struct {
 		__le64 addr;
 		u8 reserved[8];
+#ifdef CONFIG_FSL_ENETC_HW_TIMESTAMPING
+		u8 reserved1[16];
+#endif
 	} w;
 	struct {
 		__le16 inet_csum;
@@ -413,6 +422,10 @@ union enetc_rx_bd {
 			};
 			__le32 lstatus;
 		};
+#ifdef CONFIG_FSL_ENETC_HW_TIMESTAMPING
+		__le32 tstamp;
+		u8 reserved[12];
+#endif
 	} r;
 };