linux-kernel - RE: [v2, PATCH 3/4] net: stmmac: modify default value of tx-frames

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Date:   Mon, 3 Jun 2019 11:40:37 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Biao Huang <biao.huang@...iatek.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "andrew@...n.ch" <andrew@...n.ch>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "yt.shen@...iatek.com" <yt.shen@...iatek.com>,
        "jianguo.zhang@...iatek.com" <jianguo.zhang@...iatek.com>,
        "boon.leong.ong@...el.com" <boon.leong.ong@...el.com>
Subject: RE: [v2, PATCH 3/4] net: stmmac: modify default value of tx-frames

From: Biao Huang <biao.huang@...iatek.com>

> the default value of tx-frames is 25, it's too late when
> passing tstamp to stack, then the ptp4l will fail:
> 
> ptp4l -i eth0 -f gPTP.cfg -m
> ptp4l: selected /dev/ptp0 as PTP clock
> ptp4l: port 1: INITIALIZING to LISTENING on INITIALIZE
> ptp4l: port 0: INITIALIZING to LISTENING on INITIALIZE
> ptp4l: port 1: link up
> ptp4l: timed out while polling for tx timestamp
> ptp4l: increasing tx_timestamp_timeout may correct this issue,
>        but it is likely caused by a driver bug
> ptp4l: port 1: send peer delay response failed
> ptp4l: port 1: LISTENING to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)
> 
> ptp4l tests pass when changing the tx-frames from 25 to 1 with
> ethtool -C option.
> It should be fine to set tx-frames default value to 1, so ptp4l will pass
> by default.

I'm not sure if this is the right approach ... What's the timeout value 
you have for TX Timestamp ?

Thanks,
Jose Miguel Abreu