[RFC PATCH] net: macb: Process tx timestamp only on ptp packets

The current implementation timestamps all packets and also processes
the BD timestamp for the same. While it is true that HWTSTAMP_TX_ON
enables timestamps for outgoing packets, the sender of the packet
i.e. linuxptp enables timestamp for PTP or PTP event packets. Cadence
GEM IP has a provision to enable this in HW only for PTP packets.
Enable this option in DMA BD settings register to decrease overhead.

Signed-off-by: Harini Katakam <redacted>
Acked-by: Radhey Shyam Pandey <redacted>
Signed-off-by: Michal Simek <redacted>
---
 drivers/net/ethernet/cadence/macb_ptp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_ptp.c b/drivers/net/ethernet/cadence/macb_ptp.c
index c2e1f163bb14..e4f26d972219 100644
--- a/drivers/net/ethernet/cadence/macb_ptp.c
+++ b/drivers/net/ethernet/cadence/macb_ptp.c

@@ -471,7 +471,7 @@ int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd)
 			return -ERANGE;
 		fallthrough;
 	case HWTSTAMP_TX_ON:
-		tx_bd_control = TSTAMP_ALL_FRAMES;
+		tx_bd_control = TSTAMP_ALL_PTP_FRAMES;
 		break;
 	default:
 		return -ERANGE;

-- 
2.17.1