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SubjectRe: [PATCH] smsc: RFC: Workaround for problems with lan8710 phy auto MDI-X
On Fri, 30 Nov 2012, Peter Turczak wrote:

> while debugging network outages on a customers hardware I found, that
> the MDI-X function of the lan8710 phy seemed to cause trouble. When
> connecting to almost any kind of 100/1000MBit switch, the link would
> seem to come up and data where sent out to the network. But all incoming
> packets got lost somehow. This is quite bad, as the system runs from
> nfsroot while booting up during development.
>
> When I disabled the auto MDI-X function of the phy the problem went away.
>
> Signed-off-by: Peter Turczak <pt@netconsequence.de>
> ---
> drivers/net/phy/Kconfig | 10 ++++++++++
> drivers/net/phy/smsc.c | 15 +++++++++++++++
> include/linux/smscphy.h | 5 +++++
> 3 files changed, 30 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
> index 961f0b2..341f5aa 100644
> --- a/drivers/net/phy/Kconfig
> +++ b/drivers/net/phy/Kconfig
> @@ -60,6 +60,16 @@ config SMSC_PHY
> ---help---
> Currently supports the LAN83C185, LAN8187 and LAN8700 PHYs
>
> +config SMSC_PHY_DISABLE_AUTOX
> + bool "Disable MDI-X upon start"
> + depends on SMSC_PHY
> + ---help---
> + When you experience problems estabishing a stable connection
> + to a network and you have e.g. a LAN8710 ethernet phy
> + this option might help you out.
> +
> + In doubt, say N
> +

I am not sure whether compile-time option for something like this is
appropriate. Kernel module parameter, perhaps?

Of course it'd be far better if faulty hardware can be autodetected in
runtime.

--
Jiri Kosina
SUSE Labs


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