netdev - Re: [PATCH net v2 1/2] net: stmmac: fix PHY handle parsing

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Date:   Fri, 17 Mar 2023 20:57:48 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Looi Hong Aun <hong.aun.looi@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Lai Peter Jun Ann <peter.jun.ann.lai@...el.com>
Subject: Re: [PATCH net v2 1/2] net: stmmac: fix PHY handle parsing

On Fri, Mar 17, 2023 at 08:56:19PM +0100, Andrew Lunn wrote:
> On Tue, Mar 14, 2023 at 03:02:07PM +0800, Michael Sit Wei Hong wrote:
> > phylink_fwnode_phy_connect returns 0 when set to MLO_AN_INBAND.
> > This causes the PHY handle parsing to skip and the PHY will not be attached
> > to the MAC.
> 
> Please could you expand the commit message because i'm having trouble
> following this.
> 
> phylink_fwnode_phy_connect() says:
> 
> 	/* Fixed links and 802.3z are handled without needing a PHY */
> 	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
> 	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
> 	     phy_interface_mode_is_8023z(pl->link_interface)))
> 		return 0;
> 
> So your first statement is not true. It should be MLO_AN_INBAND
> and phy_interface_mode_is_8023z.
> 
> > Add additional check for PHY handle parsing when set to MLO_AN_INBAND.
> 
> Looking at the patch, there is no reference to MLO_AN_INBAND, or
> managed = "in-band-status";

That's the pesky "xpcs_an_inband" which ends up as phylink's
"ovr_an_inband"... I'm sure these are random renames of stuff to make
sure that people struggle to follow the code.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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