netdev - Re: [PATCH v2 0/5] Add support for DMA timestamp for non-PTP packets

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Message-ID: <Y09i12Wcqr0whToP@hoboy.vegasvil.org>
Date:   Tue, 18 Oct 2022 19:37:11 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     "Zulkifli, Muhammad Husaini" <muhammad.husaini.zulkifli@...el.com>
Cc:     "intel-wired-lan@...osl.org" <intel-wired-lan@...osl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "Gunasekaran, Aravindhan" <aravindhan.gunasekaran@...el.com>,
        "gal@...dia.com" <gal@...dia.com>,
        "saeed@...nel.org" <saeed@...nel.org>,
        "leon@...nel.org" <leon@...nel.org>,
        "michael.chan@...adcom.com" <michael.chan@...adcom.com>,
        "andy@...yhouse.net" <andy@...yhouse.net>,
        "Gomes, Vinicius" <vinicius.gomes@...el.com>
Subject: Re: [PATCH v2 0/5] Add support for DMA timestamp for non-PTP packets

On Tue, Oct 18, 2022 at 02:12:37PM +0000, Zulkifli, Muhammad Husaini wrote:
> > What is the use case for reporting DMA transmit time?

So the use case (mentioned below) is TSN?

> > How is this better than using SOF_TIMESTAMPING_TX_SOFTWARE ?
> 
> The ideal situation is to use SOF TIMESTAMPING TX SOFTWARE. 
> Application side will undoubtedly want to utilize PHY timestamps as much as possible. 

I'm asking about SOFTWARE not hardware time stamps.
 
> But if every application requested the HW Tx timestamp, especially during periods of high load like TSN, 
> in some cases when the controller only supports 1 HW timestamp, it would be a disaster.

But can't you offer 1 HW time stamp with many SW time stamps?

Thanks,
Rihcard