netdev - [PATCH net-next 0/5] net: phylink: fix PCS without autoneg

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Message-ID: <Z3_n_5BXkxQR4zEG@shell.armlinux.org.uk>
Date: Thu, 9 Jan 2025 15:15:11 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>
Cc: Alexander Couzens <lynxis@...0.eu>,
	Alexander Duyck <alexanderduyck@...com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Arınç ÜNAL <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>,
	Eric Woudstra <ericwouds@...il.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: [PATCH net-next 0/5] net: phylink: fix PCS without autoneg

Hi,

Eric Woudstra reported that a PCS attached using 2500base-X does not
see link when phylink is using in-band mode, but autoneg is disabled,
despite there being a valid 2500base-X signal being received. We have
these settings:

	act_link_an_mode = MLO_AN_INBAND
	pcs_neg_mode = PHYLINK_PCS_NEG_INBAND_DISABLED

Eric diagnosed it to phylink_decode_c37_word() setting state->link
false because the full-duplex bit isn't set in the non-existent link
partner advertisement word (which doesn't exist because in-band
autoneg is disabled!)

The test in phylink_mii_c22_pcs_decode_state() is supposed to catch
this state, but since we converted PCS to use neg_mode, testing the
Autoneg in the local advertisement is no longer sufficient - we need
to be looking at the neg_mode, which currently isn't provided.

We need to provide this via the .pcs_get_state() method, and this
will require modifying all PCS implementations to add the extra
argument to this method.

Patch 1 uses the PCS neg_mode in phylink_mac_pcs_get_state() to correct
the now obsolute usage of the Autoneg bit in the advertisement.

Patch 2 passes neg_mode into the .pcs_get_state() method, and updates
all users.

Patch 3 adds neg_mode as an argument to the various clause 22 state
decoder functions in phylink, modifying drivers to pass the neg_mode
through.

Patch 4 makes use of phylink_mii_c22_pcs_decode_state() rather than
using the Autoneg bit in the advertising field.

Patch 5 may be required for Eric's case - it ensures that we report
the correct state for interface types that we support only one set
of modes for when autoneg is disabled.

 drivers/net/dsa/b53/b53_serdes.c                   |  4 +-
 drivers/net/dsa/mt7530.c                           |  2 +-
 drivers/net/dsa/mv88e6xxx/pcs-6185.c               |  1 +
 drivers/net/dsa/mv88e6xxx/pcs-6352.c               |  1 +
 drivers/net/dsa/mv88e6xxx/pcs-639x.c               |  5 +-
 drivers/net/dsa/qca/qca8k-8xxx.c                   |  2 +-
 drivers/net/ethernet/cadence/macb_main.c           |  3 +-
 drivers/net/ethernet/freescale/fman/fman_dtsec.c   |  4 +-
 drivers/net/ethernet/marvell/mvneta.c              |  2 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c    |  2 +
 .../net/ethernet/marvell/prestera/prestera_main.c  |  1 +
 drivers/net/ethernet/meta/fbnic/fbnic_phylink.c    |  2 +-
 .../net/ethernet/microchip/lan966x/lan966x_main.h  |  2 +-
 .../ethernet/microchip/lan966x/lan966x_phylink.c   |  3 +-
 .../net/ethernet/microchip/lan966x/lan966x_port.c  |  4 +-
 .../net/ethernet/microchip/sparx5/sparx5_phylink.c |  2 +-
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c  |  3 +-
 drivers/net/pcs/pcs-lynx.c                         |  4 +-
 drivers/net/pcs/pcs-mtk-lynxi.c                    |  4 +-
 drivers/net/pcs/pcs-xpcs.c                         |  7 +--
 drivers/net/phy/phylink.c                          | 60 ++++++++++++++++------
 include/linux/phylink.h                            | 11 ++--
 22 files changed, 87 insertions(+), 42 deletions(-)

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