[PATCH net-next 0/9] net: add phylink managed EEE support
Russell King (Oracle)
linux at armlinux.org.uk
Fri Jan 17 01:05:20 PST 2025
On Fri, Jan 17, 2025 at 04:56:34PM +0800, Jiawen Wu wrote:
> > Hi,
> >
> > Adding managed EEE support to phylink has been on the cards ever since
> > the idea in phylib was mooted. This overly large series attempts to do
> > so. I've included all the patches as it's important to get the driver
> > patches out there.
> >
> > Patch 1 adds a definition for the clock stop capable bit in the PCS
> > MMD status register.
> >
> > Patch 2 adds a phylib API to query whether the PHY allows the transmit
> > xMII clock to be stopped while in LPI mode. This capability is for MAC
> > drivers to save power when LPI is active, to allow them to stop their
> > transmit clock.
> >
> > Patch 3 extracts a phylink internal helper for determining whether the
> > link is up.
> >
> > Patch 4 adds basic phylink managed EEE support. Two new MAC APIs are
> > added, to enable and disable LPI. The enable method is passed the LPI
> > timer setting which it is expected to program into the hardware, and
> > also a flag ehther the transmit clock should be stopped.
> >
> > I have taken the decision to make enable_tx_lpi() to return an error
> > code, but not do much with it other than report it - the intention
> > being that we can later use it to extend functionality if needed
> > without reworking loads of drivers.
> >
> > I have also dropped the validation/limitation of the LPI timer, and
> > left that in the driver code prior to calling phylink_ethtool_set_eee().
> >
> > The remainder of the patches convert mvneta, lan743x and stmmac, and
> > add support for mvneta.
> >
> > Since yesterday's RFC:
> > - fixed the mvpp2 GENMASK()
> > - dropped the DSA patch
> > - changed how phylink restricts EEE advertisement, and the EEE support
> > reported to userspace which fixes a bug.
> >
> > drivers/net/ethernet/marvell/mvneta.c | 107 ++++++++++------
> > drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 5 +
> > drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 86 +++++++++++++
> > drivers/net/ethernet/microchip/lan743x_ethtool.c | 21 ---
> > drivers/net/ethernet/microchip/lan743x_main.c | 46 ++++++-
> > drivers/net/ethernet/microchip/lan743x_main.h | 1 -
> > drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 57 +++++++--
> > drivers/net/phy/phy.c | 20 +++
> > drivers/net/phy/phylink.c | 149 ++++++++++++++++++++--
> > include/linux/phy.h | 1 +
> > include/linux/phylink.h | 45 +++++++
> > include/uapi/linux/mdio.h | 1 +
> > 12 files changed, 446 insertions(+), 93 deletions(-)
>
> Since merging these patches, phylink_connect_phy() can no longer be
> invoked correctly in ngbe_open(). The error is returned from the function
> phy_eee_rx_clock_stop(). Since EEE is not supported on our NGBE hardware.
That would mean phy_modify_mmd() is failing, but the question is why
that is. Please investigate. Thanks.
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