linux-kernel - Re: [PATCH net 1/2] net: micrel: Fix PTP frame parsing for lan8814

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Message-ID: <20240118074339.wxokx6dc7tmgcxgd@DEN-DL-M31836.microchip.com>
Date: Thu, 18 Jan 2024 08:43:39 +0100
From: Horatiu Vultur <horatiu.vultur@...rochip.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.com>
CC: <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <richardcochran@...il.com>,
	<Divya.Koppera@...rochip.com>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <UNGLinuxDriver@...rochip.com>
Subject: Re: [PATCH net 1/2] net: micrel: Fix PTP frame parsing for lan8814

The 01/15/2024 11:06, Maxime Chevallier wrote:
> 
> Hello Horatiu,

Hi Maxime,

> 
> On Sat, 13 Jan 2024 14:15:20 +0100
> Horatiu Vultur <horatiu.vultur@...rochip.com> wrote:
> 
> > The HW has the capability to check each frame if it is a PTP frame,
> > which domain it is, which ptp frame type it is, different ip address in
> > the frame. And if one of these checks fail then the frame is not
> > timestamp. Most of these checks were disabled except checking the field
> > minorVersionPTP inside the PTP header. Meaning that once a partner sends
> > a frame compliant to 8021AS which has minorVersionPTP set to 1, then the
> > frame was not timestamp because the HW expected by default a value of 0
> > in minorVersionPTP. This is exactly the same issue as on lan8841.
> > Fix this issue by removing this check so the userspace can decide on this.
> >
> > Fixes: ece19502834d ("net: phy: micrel: 1588 support for LAN8814 phy")
> > Signed-off-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
> > ---
> >  drivers/net/phy/micrel.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
> > index bf4053431dcb3..1752eaeadc42e 100644
> > --- a/drivers/net/phy/micrel.c
> > +++ b/drivers/net/phy/micrel.c
> > @@ -120,6 +120,9 @@
> >   */
> >  #define LAN8814_1PPM_FORMAT                  17179
> >
> > +#define PTP_RX_VERSION                               0x0248
> > +#define PTP_TX_VERSION                               0x0288
> > +
> >  #define PTP_RX_MOD                           0x024F
> >  #define PTP_RX_MOD_BAD_UDPV4_CHKSUM_FORCE_FCS_DIS_ BIT(3)
> >  #define PTP_RX_TIMESTAMP_EN                  0x024D
> > @@ -3150,6 +3153,10 @@ static void lan8814_ptp_init(struct phy_device *phydev)
> >       lanphy_write_page_reg(phydev, 5, PTP_TX_PARSE_IP_ADDR_EN, 0);
> >       lanphy_write_page_reg(phydev, 5, PTP_RX_PARSE_IP_ADDR_EN, 0);
> >
> > +     /* Disable checking for minorVersionPTP field */
> > +     lanphy_write_page_reg(phydev, 5, PTP_RX_VERSION, 0xff00);
> > +     lanphy_write_page_reg(phydev, 5, PTP_TX_VERSION, 0xff00);
> 
> Small nit: This looks a bit like magic values, from the datasheet I
> understand the upper byte is the max supported version and the lower
> byte is the min supported version, maybe this could be wrapped in
> macros ?

Your understanding is correct. Yes, I will update this in the next
series.

> 
> > +
> >       skb_queue_head_init(&ptp_priv->tx_queue);
> >       skb_queue_head_init(&ptp_priv->rx_queue);
> >       INIT_LIST_HEAD(&ptp_priv->rx_ts_list);
> 
> Besides that,
> 
> Reviewed-by: Maxime Chevallier <maxime.chevallier@...tlin.com>
> 
> Thanks,
> 
> Maxime

-- 
/Horatiu