netdev - RE: [PATCH 5/5] dpaa2-eth: support PTP Sync packet one-step timestamping

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Date:   Wed, 16 Sep 2020 11:43:05 +0000
From:   "Y.b. Lu" <yangbo.lu@....com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        Richard Cochran <richardcochran@...il.com>
Subject: RE: [PATCH 5/5] dpaa2-eth: support PTP Sync packet one-step
 timestamping

Hi Jakub,

> -----Original Message-----
> From: Jakub Kicinski <kuba@...nel.org>
> Sent: Thursday, September 10, 2020 10:43 PM
> To: Y.b. Lu <yangbo.lu@....com>
> Cc: netdev@...r.kernel.org; David S . Miller <davem@...emloft.net>; Ioana
> Ciornei <ioana.ciornei@....com>; Ioana Ciocoi Radulescu
> <ruxandra.radulescu@....com>; Richard Cochran
> <richardcochran@...il.com>
> Subject: Re: [PATCH 5/5] dpaa2-eth: support PTP Sync packet one-step
> timestamping
> 
> On Thu, 10 Sep 2020 17:38:35 +0800 Yangbo Lu wrote:
> > This patch is to add PTP sync packet one-step timestamping support.
> > 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.
> >
> > Signed-off-by: Yangbo Lu <yangbo.lu@....com>
> 
> This doesn't build on 32bit:
> 
> ERROR: modpost: "__udivdi3"
> [drivers/net/ethernet/freescale/dpaa2/fsl-dpaa2-eth.ko] undefined!
> ERROR: modpost: "__umoddi3"
> [drivers/net/ethernet/freescale/dpaa2/fsl-dpaa2-eth.ko] undefined!

Will fix by using do_div in next version. Thanks.