linux-kernel - Re: [net v1] net: stmmac: set IC bit when transmitting frames with HW timestamp

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Date:   Sat, 22 Jun 2019 16:18:18 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     weifeng.voon@...el.com
Cc:     mcoquelin.stm32@...il.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, joabreu@...opsys.com,
        peppe.cavallaro@...com, andrew@...n.ch, f.fainelli@...il.com,
        alexandre.torgue@...com, boon.leong.ong@...el.com
Subject: Re: [net v1] net: stmmac: set IC bit when transmitting frames with
 HW timestamp

From: Voon Weifeng <weifeng.voon@...el.com>
Date: Wed, 19 Jun 2019 22:41:48 +0800

> From: Roland Hii <roland.king.guan.hii@...el.com>
> 
> When transmitting certain PTP frames, e.g. SYNC and DELAY_REQ, the
> PTP daemon, e.g. ptp4l, is polling the driver for the frame transmit
> hardware timestamp. The polling will most likely timeout if the tx
> coalesce is enabled due to the Interrupt-on-Completion (IC) bit is
> not set in tx descriptor for those frames.
> 
> This patch will ignore the tx coalesce parameter and set the IC bit
> when transmitting PTP frames which need to report out the frame
> transmit hardware timestamp to user space.
> 
> Fixes: f748be531d70 ("net: stmmac: Rework coalesce timer and fix multi-queue races")
> Signed-off-by: Roland Hii <roland.king.guan.hii@...el.com>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
> Signed-off-by: Voon Weifeng <weifeng.voon@...el.com>

Applied and queued up for -stable.