[E1000-devel] ixgbe/PTP missing timestamp latency information

[EL K. Y. <Yac...@cr...>]

Dear all,

In the igb driver TX and RX time stamp latency is defined and taken into account to correct the time stamp value.

In the ixgbe driver this is not done, I do not think it is because there is no time stamp latency in the 10 Gig controllers, but rather because the latency values are not documented yet.
If someone can tell me how to find these values  I could make the changes in the ixgbe driver.
I am most interested by the X550 controller.


For information the values for the i210 controller in the igb driver are set to:
/* Transmit and receive latency (for PTP timestamps) */
#define IGB_I210_TX_LATENCY_10		9542
#define IGB_I210_TX_LATENCY_100		1024
#define IGB_I210_TX_LATENCY_1000	178
#define IGB_I210_RX_LATENCY_10		20662
#define IGB_I210_RX_LATENCY_100		2213
#define IGB_I210_RX_LATENCY_1000	448

The latest i210 public data sheet (2.8 September 2015) only documents the TS latency for 100 BT mode.
Is there another source of information that I am missing?

Regards
Yacine