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net: ethtool: add KSZ87xx low-loss cable PHY tunables

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Introduce vendor-specific PHY tunable identifiers to control the
KSZ87xx low-loss cable erratum handling through the ethtool PHY
tunable interface.

The following tunables are added:

- a boolean "short-cable" tunable, applying a documented and
  conservative preset intended for short or low-loss Ethernet cables;

- an integer LPF bandwidth tunable, allowing advanced adjustment of the
  receiver low-pass filter bandwidth;

- an integer DSP EQ initial value tunable, allowing advanced tuning of
  the PHY equalizer initialization.

The actual behavior is implemented by the corresponding PHY and switch
drivers.

Reviewed-by: Marek Vasut <marex@nabladev.com>
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Signed-off-by: Fidelio Lawson <fidelio.lawson@exotec.com>
Link: https://patch.msgid.link/20260609-ksz87xx_errata_low_loss_connections-v10-2-9ba4418cf3db@exotec.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Fidelio Lawson
2026-06-09 18:19:56 +02:00
committed by Jakub Kicinski
parent 014f0c98cf
commit 13655144dd
3 changed files with 13 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/uapi/linux/ethtool.h
View File

@@ -291,6 +291,9 @@ enum phy_tunable_id {
ETHTOOL_PHY_DOWNSHIFT,
ETHTOOL_PHY_FAST_LINK_DOWN,
ETHTOOL_PHY_EDPD,
ETHTOOL_PHY_SHORT_CABLE_PRESET,
ETHTOOL_PHY_LPF_BW,
ETHTOOL_PHY_DSP_EQ_INIT_VALUE,
/*
* Add your fresh new phy tunable attribute above and remember to update
* phy_tunable_strings[] in net/ethtool/common.c

3
net/ethtool/common.c
View File

@@ -101,6 +101,9 @@ phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
[ETHTOOL_PHY_DOWNSHIFT] = "phy-downshift",
[ETHTOOL_PHY_FAST_LINK_DOWN] = "phy-fast-link-down",
[ETHTOOL_PHY_EDPD] = "phy-energy-detect-power-down",
[ETHTOOL_PHY_SHORT_CABLE_PRESET] = "phy-short-cable-preset",
[ETHTOOL_PHY_LPF_BW] = "phy-lpf-bandwidth",
[ETHTOOL_PHY_DSP_EQ_INIT_VALUE] = "phy-dsp-eq-init-value",
};
#define __LINK_MODE_NAME(speed, type, duplex) \

7
net/ethtool/ioctl.c
View File

@@ -3133,6 +3133,7 @@ static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
switch (tuna->id) {
case ETHTOOL_PHY_DOWNSHIFT:
case ETHTOOL_PHY_FAST_LINK_DOWN:
case ETHTOOL_PHY_SHORT_CABLE_PRESET:
if (tuna->len != sizeof(u8) ||
tuna->type_id != ETHTOOL_TUNABLE_U8)
return -EINVAL;
@@ -3142,6 +3143,12 @@ static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
tuna->type_id != ETHTOOL_TUNABLE_U16)
return -EINVAL;
break;
case ETHTOOL_PHY_LPF_BW:
case ETHTOOL_PHY_DSP_EQ_INIT_VALUE:
if (tuna->len != sizeof(u32) ||
tuna->type_id != ETHTOOL_TUNABLE_U32)
return -EINVAL;
break;
default:
return -EINVAL;
}