Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [RFC PATCH] net: phy/mdio: enable mmd indirect access through
 phy_mii_ioctl()
To:     Andrew Lunn <andrew@lunn.ch>
CC:     "Russell King (Oracle)" <linux@armlinux.org.uk>,
        "David S. Miller" <davem@davemloft.net>, <netdev@vger.kernel.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        <linux-kernel@vger.kernel.org>,
        Vignesh Raghavendra <vigneshr@ti.com>
References: <YYBBHsFEwGdPJw3b@lunn.ch>
 <YYBF3IZoSN6/O6AL@shell.armlinux.org.uk> <YYCLJnY52MoYfxD8@lunn.ch>
 <YYExmHYW49jOjfOt@shell.armlinux.org.uk>
 <bc9df441-49bf-5c8a-891c-cc3f0db00aba@ti.com>
 <YYF4ZQHqc1jJsE/+@shell.armlinux.org.uk>
 <e18f17bd-9e77-d3ef-cc1e-30adccb7cdd5@ti.com>
 <828e2d69-be15-fe69-48d8-9cfc29c4e76e@ti.com> <YYGxvomL/0tiPzvV@lunn.ch>
 <8d24c421-064c-9fee-577a-cbbf089cdf33@ti.com> <YYHXcyCOPiUkk8Tz@lunn.ch>
From:   Grygorii Strashko <grygorii.strashko@ti.com>
Message-ID: <01a0ebf9-5d3f-e886-4072-acb9bf418b12@ti.com>
Date:   Wed, 3 Nov 2021 20:42:07 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.13.0
MIME-Version: 1.0
In-Reply-To: <YYHXcyCOPiUkk8Tz@lunn.ch>
Content-Type: text/plain; charset="utf-8"; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk


On 03/11/2021 02:27, Andrew Lunn wrote:
>>> 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.

Now I give up - as mentioned there is now way to sync User space vs Kernel
MMD transactions and so no way to get trusted results.


Thanks all for participating in discussion.

-- 
Best regards,
grygorii