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List:       e1000-devel
Subject:    Re: [E1000-devel] [igbvf] Accessing PTP clock from a Virtual Function
From:       "Keller, Jacob E" <jacob.e.keller () intel ! com>
Date:       2022-07-19 18:02:29
Message-ID: SA2PR11MB5100D67E929548282BFF2289D68F9 () SA2PR11MB5100 ! namprd11 ! prod ! outlook ! com
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> -----Original Message-----
> From: Fujinaka, Todd <todd.fujinaka@intel.com>
> Sent: Thursday, May 05, 2022 7:23 AM
> To: B.Von_Horn@wzl.rwth-aachen.de; e1000-devel@lists.sourceforge.net
> Subject: Re: [E1000-devel] [igbvf] Accessing PTP clock from a Virtual Function
> 
> Not everything in the hardware is enabled in the software. We do not appear to
> be using the register you mention.
> 
> I have been told by those more familiar with PTP that the Time Sync registers are
> in chapter 8.16 and are only accessible through the PF.
> 
> Todd Fujinaka
> Software Application Engineer
> Ethernet Products Group
> Intel Corporation
> todd.fujinaka@intel.com
> 
> -----Original Message-----
> From: B.Von_Horn@wzl.rwth-aachen.de <B.Von_Horn@wzl.rwth-aachen.de>
> Sent: Thursday, May 5, 2022 5:41 AM
> To: e1000-devel@lists.sourceforge.net
> Subject: [E1000-devel] [igbvf] Accessing PTP clock from a Virtual Function
> 
> Hello,
> 
> I'd like to access the PTP timer of an i350T2V2 from a VF. The Datasheet (Rev. 2.6)
> states in section 7.8.2.12.2 that "VMs have access to the real time clock \
> register". But the only timer-related register which is mapped to a VF I could find \
> is the free-running timer (VTFRTIMER at 0x1048). So I'm kind of confused.
> 
> P.S. yes I know that there is ptp_kvm module, but it uses hypercalls which I'd like
> to avoid.
> 
> Thanks a lot,
> 
> Bjarne
> 
> 

Todd is correct, the Time Sync registers are unfortunately not accessible to the VF.

Thanks,
Jake



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