# Re: \[RFC PATCH\] net: phy/mdio: enable mmd indirect access through phy\_mii\_ioctl()

- From: Andrew Lunn \<andrew@lunn.ch\>
- Date: 2021-11-03 00:27:43 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/11/1561362
- Thread: https://ratatoskr.run/netdev/2021/11/1560000/t.md

```text
> > What i find interesting is that you and the other resent requester are
> > using the same user space tool. If you implement C45 over C22 in that
> > tool, you get your solution, and it will work for older kernels as
> > well. Also, given the diverse implementations of this IOTCL, it
> > probably works for more drivers than just those using phy_mii_ioctl().
> 
> Do you mean change uapi, like
>  add mdio_phy_id_is_c45_over_c22() and
>  flag #define MDIO_PHY_ID_C45_OVER_C22 0x4000?

No, i mean user space implements C45 over C22. Make phytool write
MII_MMD_CTRL and MII_MMD_DATA to perform a C45 over C22.

	     Andrew
```