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Date:   Fri, 18 Sep 2020 14:33:07 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     yangbo.lu@....com
Cc:     netdev@...r.kernel.org, kuba@...nel.org, ioana.ciornei@....com,
        ruxandra.radulescu@....com, richardcochran@...il.com,
        saeed@...nel.org
Subject: Re: [v4, 0/5] dpaa2_eth: support 1588 one-step timestamping

From: Yangbo Lu <yangbo.lu@....com>
Date: Fri, 18 Sep 2020 17:07:57 +0800

> This patch-set is to add MC APIs of 1588 one-step timestamping, and
> support one-step timestamping for PTP Sync packet on DPAA2.
> 
> Before egress, one-step timestamping enablement needs,
> 
> - Enabling timestamp and FAS (Frame Annotation Status) in
>   dpni buffer layout.
> 
> - Write timestamp to frame annotation and set PTP bit in
>   FAS to mark as one-step timestamping event.
> 
> - Enabling one-step timestamping by dpni_set_single_step_cfg()
>   API, with offset provided to insert correction time on frame.
>   The offset must respect all MAC headers, VLAN tags and other
>   protocol headers accordingly. The correction field update can
>   consider delays up to one second. So PTP frame needs to be
>   filtered and parsed, and written timestamp into Sync frame
>   originTimestamp field.
> 
> The operation of API dpni_set_single_step_cfg() has to be done
> when no one-step timestamping frames are in flight. So we have
> to make sure the last one-step timestamping frame has already
> been transmitted on hardware before starting to send the current
> one. The resolution is,
> 
> - Utilize skb->cb[0] to mark timestamping request per packet.
>   If it is one-step timestamping PTP sync packet, queue to skb queue.
>   If not, transmit immediately.
> 
> - Schedule a work to transmit skbs in skb queue.
> 
> - mutex lock is used to ensure the last one-step timestamping packet
>   has already been transmitted on hardware through TX confirmation queue
>   before transmitting current packet.
 ...

Series applied to net-next, thanks.

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