netdev - Re: [PATCH net 1/1] net: stmmac: enable timestamp snapshot for required PTP packets in dwmac v5.10a

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Date:   Tue, 26 May 2020 16:28:25 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     fugang.duan@....com
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com,
        joabreu@...opsys.com, kuba@...nel.org, netdev@...r.kernel.org,
        mcoquelin.stm32@...il.com, p.zabel@...gutronix.de,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net 1/1] net: stmmac: enable timestamp snapshot for
 required PTP packets in dwmac v5.10a

From: Fugang Duan <fugang.duan@....com>
Date: Mon, 25 May 2020 16:18:14 +0800

> For rx filter 'HWTSTAMP_FILTER_PTP_V2_EVENT', it should be
> PTP v2/802.AS1, any layer, any kind of event packet, but HW only
> take timestamp snapshot for below PTP message: sync, Pdelay_req,
> Pdelay_resp.
> 
> Then it causes below issue when test E2E case:
> ptp4l[2479.534]: port 1: received DELAY_REQ without timestamp
> ptp4l[2481.423]: port 1: received DELAY_REQ without timestamp
> ptp4l[2481.758]: port 1: received DELAY_REQ without timestamp
> ptp4l[2483.524]: port 1: received DELAY_REQ without timestamp
> ptp4l[2484.233]: port 1: received DELAY_REQ without timestamp
> ptp4l[2485.750]: port 1: received DELAY_REQ without timestamp
> ptp4l[2486.888]: port 1: received DELAY_REQ without timestamp
> ptp4l[2487.265]: port 1: received DELAY_REQ without timestamp
> ptp4l[2487.316]: port 1: received DELAY_REQ without timestamp
> 
> Timestamp snapshot dependency on register bits in received path:
> SNAPTYPSEL TSMSTRENA TSEVNTENA 	PTP_Messages
> 01         x         0          SYNC, Follow_Up, Delay_Req,
>                                 Delay_Resp, Pdelay_Req, Pdelay_Resp,
>                                 Pdelay_Resp_Follow_Up
> 01         0         1          SYNC, Pdelay_Req, Pdelay_Resp
> 
> For dwmac v5.10a, enabling all events by setting register
> DWC_EQOS_TIME_STAMPING[SNAPTYPSEL] to 2’b01, clearing bit [TSEVNTENA]
> to 0’b0, which can support all required events.
> 
> Signed-off-by: Fugang Duan <fugang.duan@....com>

Applied and queued up for -stable, thanks.