netdev - Re: [PATCH net-next 5/5] net: phylink: provide fixed state for 1000base-X and 2500base-X

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Message-ID: <Z4EBKhGVwlVhxAxw@shell.armlinux.org.uk>
Date: Fri, 10 Jan 2025 11:14:50 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Eric Woudstra <ericwouds@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Alexander Couzens <lynxis@...0.eu>,
	Alexander Duyck <alexanderduyck@...com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Ar__n__ __NAL <arinc.unal@...nc9.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Daniel Golle <daniel@...rotopia.org>,
	Daniel Machon <daniel.machon@...rochip.com>,
	"David S. Miller" <davem@...emloft.net>,
	DENG Qingfang <dqfext@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Ioana Ciornei <ioana.ciornei@....com>,
	Jakub Kicinski <kuba@...nel.org>,
	Jose Abreu <Jose.Abreu@...opsys.com>, kernel-team@...a.com,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Madalin Bucur <madalin.bucur@....com>,
	Marcin Wojtas <marcin.s.wojtas@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Michal Simek <michal.simek@....com>, netdev@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
	Sean Anderson <sean.anderson@...o.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Taras Chornyi <taras.chornyi@...ision.eu>,
	UNGLinuxDriver@...rochip.com, Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH net-next 5/5] net: phylink: provide fixed state for
 1000base-X and 2500base-X

On Fri, Jan 10, 2025 at 09:04:56AM +0100, Eric Woudstra wrote:
> 
> On 1/9/25 4:15 PM, Russell King (Oracle) wrote:
> > When decoding clause 22 state, if in-band is disabled and using either
> > 1000base-X or 2500base-X, rather than reporting link-down, we know the
> > speed, and we only support full duplex. Pause modes taken from XPCS.
> > 
> > This fixes a problem reported by Eric Woudstra.
> > 
> > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > ---
> >  drivers/net/phy/phylink.c | 29 +++++++++++++++++++----------
> >  1 file changed, 19 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> 
> After changing 'if (pcs->neg_mode)' to 'if (pcs && pcs->neg_mode)' in
> patch 1/5, I have tested this patch-set and I get link up.
> 
> Tested-by: Eric Woudstra <ericwouds@...il.com>

Thanks Eric. Much appreciate your patience with this tangent to the
issue you have - your report highlighted that there was this other
bug that needed fixing in addition to the problem you were experiencing.
I've fixed that slightly differently (as below) and I'll post a v2
shortly.

+       if (!pcs || pcs->neg_mode)
+               autoneg = pl->pcs_neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED;
+       else
+               autoneg = linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+                                           state->advertising);

there, since the "else" clause is the legacy case. I doubt that makes
any difference to your testing scenario, but please let me know if
you want to re-test with that before I add your t-b.

Next, we need to address your problem properly... I'll be looking at
that today.

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