lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Wed, 23 Mar 2022 19:34:14 +0100
From:   Michael Walle <>
To:     Andrew Lunn <>,
        Heiner Kallweit <>,
        Russell King <>,
        Jakub Kicinski <>,
        Paolo Abeni <>
Cc:     "David S . Miller" <>,
        Xu Liang <>,
        Alexandre Belloni <>,
        Florian Fainelli <>,,,
        Michael Walle <>
Subject: [PATCH RFC net-next 0/5] net: phy: C45-over-C22 access


This is the result of this discussion:

The goal here is to get the GYP215 and LAN8814 running on the Microchip
LAN9668 SoC. The LAN9668 suppports one external bus and unfortunately, the
LAN8814 has a bug which makes it impossible to use C45 on that bus.
Fortunately, it was the intention of the GPY215 driver to be used on a C22
bus. But I think this could have never really worked, because the
phy_get_c45_ids() will always do c45 accesses and thus on MDIO bus drivers
which will correctly check for the MII_ADDR_C45 flag and return -EOPNOTSUPP
the function call will fail and thus gpy_probe() will fail. This series
tries to fix that and will lay the foundation to add a workaround for the
LAN8814 bug by forcing an MDIO bus to be c22-only.

At the moment, the probe_capabilities is taken into account to decide if
we have to use C45-over-C22. What is still missing from this series is the
handling of a device tree property to restrict the probe_capabilities to

Since net-next is closed, this is marked as RFC to get some early feedback.

Michael Walle (5):
  net: phy: mscc-miim: reject clause 45 register accesses
  net: phy: support indirect c45 access in get_phy_c45_ids()
  net: phy: mscc-miim: add probe_capabilities
  net: phy: introduce is_c45_over_c22 flag
  net: phylink: handle the new is_c45_over_c22 property

 drivers/net/mdio/mdio-mscc-miim.c |  7 ++++
 drivers/net/phy/mxl-gpy.c         |  2 +-
 drivers/net/phy/phy_device.c      | 65 ++++++++++++++++++++++++++-----
 drivers/net/phy/phylink.c         |  2 +-
 include/linux/phy.h               |  4 +-
 5 files changed, 68 insertions(+), 12 deletions(-)


Powered by blists - more mailing lists