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generic: net: phy: use all SerDes MAC interface modes

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Instead of forcing 2.5G PHYs into rate-adapter mode which results higher
energy consumption, lack of support for half-duplex modes and typically
worse performance when linked at speeds less than 2.5G, use SGMII mode
which allows the MAC to follow the PHY speed.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2024-10-09 00:23:53 +01:00
parent 69906789e0
commit 5281033831
1 changed files with 36 additions and 0 deletions
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36
target/linux/generic/pending-6.6/706-net-phy-populate-host_interfaces-when-attaching-PHY.patch Normal file
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From 9e1a0d2006bc108b239b5bc00b42c2a8cc651217 Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Tue, 8 Oct 2024 23:58:41 +0100
Subject: [PATCH] net: phy: populate host_interfaces when attaching PHY
Use bitmask of interfaces supported by the MAC for the PHY to choose
from if the declared interface mode is among those using a single pair
of SerDes lanes.
This will allow 2500Base-T PHYs to switch to SGMII on most hosts, which
results in half-duplex being supported in case the MAC supports them.
Without this change, 2500Base-T PHYs will always operate in 2500Base-X
mode with rate-matching, which is not only wasteful in terms of energy
consumption, but also limits the supported interface modes to
full-duplex only.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/phy/phylink.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -2044,6 +2044,13 @@ int phylink_fwnode_phy_connect(struct ph
pl->link_config.interface = pl->link_interface;
}
+ /* Assume SerDes interface modes share the same lanes and allow
+ * the PHY to switch between them
+ */
+ if (test_bit(pl->link_interface, phylink_sfp_interfaces))
+ phy_interface_and(phy_dev->host_interfaces, phylink_sfp_interfaces,
+ pl->config->supported_interfaces);
+
ret = phy_attach_direct(pl->netdev, phy_dev, flags,
pl->link_interface);
phy_device_free(phy_dev);