linux-kernel - RE: [PATCH net] net: phy: mscc: fix packet loss due to RGMII delays

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Message-ID: <BYAPR12MB477315C261B843487E2F21949E27A@BYAPR12MB4773.namprd12.prod.outlook.com>
Date:   Tue, 27 Jun 2023 09:19:51 +0000
From:   "Katakam, Harini" <harini.katakam@....com>
To:     Vladimir Oltean <vladimir.oltean@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Jose Abreu <Jose.Abreu@...opsys.com>, Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net] net: phy: mscc: fix packet loss due to RGMII delays



> -----Original Message-----
> From: Vladimir Oltean <vladimir.oltean@....com>
> Sent: Tuesday, June 27, 2023 2:41 PM
> To: netdev@...r.kernel.org
> Cc: Jose Abreu <Jose.Abreu@...opsys.com>; Andrew Lunn
> <andrew@...n.ch>; Heiner Kallweit <hkallweit1@...il.com>; Russell King
> <linux@...linux.org.uk>; David S. Miller <davem@...emloft.net>; Eric
> Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo
> Abeni <pabeni@...hat.com>; linux-kernel@...r.kernel.org; Katakam, Harini
> <harini.katakam@....com>
> Subject: [PATCH net] net: phy: mscc: fix packet loss due to RGMII delays
> 
> Two deadly typos break RX and TX traffic on the VSC8502 PHY using RGMII
> if phy-mode = "rgmii-id" or "rgmii-txid", and no "tx-internal-delay-ps"
> override exists. The negative error code from phy_get_internal_delay()
> does not get overridden with the delay deduced from the phy-mode, and
> later gets committed to hardware. Also, the rx_delay gets overridden by
> what should have been the tx_delay.
> 
> Fixes: dbb050d2bfc8 ("phy: mscc: Add support for RGMII delay
> configuration")
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>

Thanks
Reviewed-by: Harini Katakam <harini.katakam@....com>

Regards,
Harini