netdev - Using ethtool or swconfig to change link settings for mt7620a?

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Date:   Sat, 8 Jun 2019 04:06:54 -0500
From:   Daniel Santos <daniel.santos@...ox.com>
To:     Felix Fietkau <nbd@....name>,
        openwrt-devel <openwrt-devel@...ts.openwrt.org>
Cc:     netdev@...r.kernel.org, Vitaly Chekryzhev <13hakta@...il.com>
Subject: Using ethtool or swconfig to change link settings for mt7620a?

Hello,

I need to change auto-negotiate, speed and duplex for a port on my
mt7620a-based device, but I'm not quite certain that I understand the
structure here.  When using ethtool on eth0 I always get ENODEV,
apparently because priv->phy_dev is always NULL in fe_get_link_ksettings
of drivers/net/ethernet/mtk/ethtool.c.  But I'm being told that eth0 is
only an internal device between the µC and the switch hardware, so it
isn't even the one I need to change.

If this is true, then it looks like I will need to implement a
get_port_link function for struct switch_dev_ops?  Can anybody confirm
this to be the case?  Also, are there any examples aside from the
Broadcom drivers?  I have the mt7620 programmer's guide and it specifies
the registers I need to change.

Thanks,
Daniel