Subject: Re: [RFC][PATCH 1/1] net: support for hardware timestamping

From: Ingo Oeser <[email-masked]>
Date: Wed, 30 Jul 2008 11:34:49 +0200

Hi Patrick,

Patrick Ohly schrieb:
> Perhaps the parameter of the new
> SO_TXTIMESTAMP can be a multi-value? 0 = no TX time stamps, 1 = TX time
> stamp in hardware if possible with software as fallback, 2 = only
> hardware TX time stamps. Either that, or use the same new socket flag as
> for RX time stamps.

Perhaps we can make it a bitmask (please choose a good prefix instead of XXX):

enum {
	XXX_SOFTWARE_TX_TIMESTAMP = (1 << 0),
	XXX_SOFTWARE_RX_TIMESTAMP = (1 << 1),
	XXX_DRIVER_TX_TIMESTAMP	  = (1 << 2),
	XXX_DRIVER_RX_TIMESTAMP	  = (1 << 3),
};

That way we can express everything required so far and have some bits left 
to define precision, system time correlation and more.

Best Regards

Ingo Oeser