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

[David Miller]

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

> From: Roland Hii <roland.king.guan.hii@xxxxxxxxx>
> 
> 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@xxxxxxxxx>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@xxxxxxxxx>
> Signed-off-by: Voon Weifeng <weifeng.voon@xxxxxxxxx>

Applied and queued up for -stable.