[PATCH 0/4] meson8b-odroidc1: ethernet support

[linus.luessing@c0d3.blue (Linus Lüssing)]

Hi Emiliano,

On Wed, Sep 27, 2017 at 12:39:32PM +0200, Emiliano Ingrassia wrote:
> This patchset enables ethernet support on Odroid-C1/C1+ boards,
> improving and extending the ethernet description in the relative
> device tree.
> 
> In particular:
> - the mpll2 clock is enabled to avoid timeout during ethernet DMA reset;
> - the Meson8b ethernet controller description is fixed and extended;
> - the Odroid-C1/C1+ ethernet PHY description is added;
> - the dwmac sleep and timeout values used during DMA reset are fixed.
> 
> This patchset has been tested on Odroid-C1+ board.

I tried this patchset on an Odroid C1+ with a v4.14-rc3 kernel
plus these currently pending patches from this mailing list [0].

I'm observing the following issue:

1) The C1+ successfully gets an IPv6 address from stateless
   autoconfiguration
2) IPv6 pinging from the C1+ to another host X works
        C1+ -> X => OK
3) IPv6 pinging from host X to the C1+ does not work:
        X -> C1+ => not OK
4) While ping'ing from X->C1+ after some seconds / a minute  a
   parallel C1+->X ping stops working too. After stopping the
   X->C1+ ping the C1+->X ping quickly recovers within about
   one or two seconds.

I tried adding the "eee-broken-1000t;" parameter to
meson8b-odroidc1.dts similar to meson-gxbb-odroidc2.dts. Did not
seem to help though.

Still, this behaviour very much feels like a powersaving issue.
And/or an incomplete setup of the random MAC address on the C1+,
for instance a missing notification of the MAC address for the
ethernet chip, leaving it unable to wake up / create interrupts
for incoming frames with the destination of the C1+.

The C1+ and host X are both connected via cable to the same switch
of a router.

Can you reproduce this issue on your side, Emiliano?

Regards, Linus


[0]:

e008445 ARM: multi_v7_defconfig: Add Amlogic Meson MMC support
a315380 ARM: dts: meson8b: Add MMC nodes
90a73b6 mmc: meson-mx-sdio: Add a driver for the Amlogic Meson8 and Meson8b SoCs
2f0b808 dt-bindings: mmc: Document the Amlogic Meson8 and Meson8b SDIO bindings
31247f2 net: stmmac: fixing DMA reset sleep and timeout values
1f43db3 ARM: dts: meson8b-odroidc1: enabling ethernet support
8ecc9d3 ARM: dts: meson8b: extending ethernet controller description
be4a137 clk: meson8b: keep mpll2 clock enabled
54b818c ARM: dts: meson8b: add reserved memory zone to fix silent freezes
113819d ARM: dts: meson: enabling the USB Host controller on Odroid-C1/C1+ board
7240c6d ARM: dts: meson: fixing USB support on Meson8b
a9153ba ARM: dts: meson8b: add support for booting the secondary CPU cores
8529b23 ARM: dts: meson8: add support for booting the secondary CPU cores
fd053c9 ARM: meson: Add SMP bringup code for Meson8 and Meson8b
d6b74cd ARM: smp_scu: allow the platform code to read the SCU CPU status
822a0d8 ARM: smp_scu: add a helper for powering on a specific CPU
7da8338 dt-bindings: Amlogic: Add Meson8 and Meson8b SMP related documentation