netdev - RE: [PATCH net-next 4/5] liquidio VF timestamp

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Message-ID: <BN6PR07MB2932EC69BFB4F1D8B252F080F3840@BN6PR07MB2932.namprd07.prod.outlook.com>
Date:   Thu, 8 Dec 2016 22:41:23 +0000
From:   "Chickles, Derek" <Derek.Chickles@...ium.com>
To:     Or Gerlitz <gerlitz.or@...il.com>,
        "Vatsavayi, Raghu" <Raghu.Vatsavayi@...ium.com>
CC:     David Miller <davem@...emloft.net>,
        Linux Netdev List <netdev@...r.kernel.org>,
        "Vatsavayi, Raghu" <Raghu.Vatsavayi@...ium.com>,
        "Burla, Satananda" <Satananda.Burla@...ium.com>,
        "Manlunas, Felix" <Felix.Manlunas@...ium.com>
Subject: RE: [PATCH net-next 4/5] liquidio VF timestamp



> -----Original Message-----
> From: Or Gerlitz [mailto:gerlitz.or@...il.com]
> Sent: Thursday, December 08, 2016 1:10 PM
> To: Vatsavayi, Raghu
> Cc: David Miller; Linux Netdev List; Vatsavayi, Raghu; Chickles, Derek; Burla,
> Satananda; Manlunas, Felix
> Subject: Re: [PATCH net-next 4/5] liquidio VF timestamp
> 
> On Thu, Dec 8, 2016 at 11:00 PM, Raghu Vatsavayi
> <rvatsavayi@...iumnetworks.com> wrote:
> > Adds support for VF timestamp.
> 
> same here, what's the use case? do you have per VF HW clocks to set?
> How it works if VF A does setup of X and VF B setup of Y

There's no support for adjusting per-VF clock skew and such in hardware,
but there is support for retrieving the hardware timestamp for Tx and Rx packets
on the VF. Applications can use this for their purposes.