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SubjectRe: [RFC PATCH] net: phy/mdio: enable mmd indirect access through phy_mii_ioctl()
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On 02/11/2021 20:37, Grygorii Strashko wrote:
> Hi Russell, Andrew,
>
> Thanks a lot for you comments.
>
> On 02/11/2021 19:41, Russell King (Oracle) wrote:
>> On Tue, Nov 02, 2021 at 07:19:46PM +0200, Grygorii Strashko wrote:
>>> It would require MDIO bus lock, which is not a solution,
>>> or some sort of batch processing, like for mmd:
>>>   w reg1 val1
>>>   w reg2 val2
>>>   w reg1 val3
>>>   r reg2
>>>
>>> What Kernel interface do you have in mind?
>>
>> That is roughly what I was thinking, but Andrew has basically said no
>> to it.
>>
>>> Sry, but I have to note that demand for this become terribly high, min two pings in months
>>
>> Feel free to continue demanding it, but it seems that at least two of
>> the phylib maintainers are in agreement that providing generic
>> emulation of C45 accesses in kernel space is just not going to happen.
>>
>
> not ready to give up.
>
> One more idea how about mdiobus_get_phy(), so we can search for PHY and
> if present try to use proper API phy_read/phy_write_mmd?
>
>

smth like below
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index a3bfb156c83d..8ebe59b5647d 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -285,6 +285,7 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
u16 val = mii_data->val_in;
bool change_autoneg = false;
int prtad, devad;
+ struct phy_device *phydev_rq = phydev;

switch (cmd) {
case SIOCGMIIPHY:
@@ -300,8 +301,18 @@ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd)
prtad = mii_data->phy_id;
devad = mii_data->reg_num;
}
- mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad,
- devad);
+
+ if (prtad != phydev->mdio.addr)
+ phydev_rq = mdiobus_get_phy(phydev->mdio.bus, prtad);
+
+ if (!phydev_rq) {
+ mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad, devad);
+ } else if (mdio_phy_id_is_c45(mii_data->phy_id) && !phydev->is_c45) {
+ mii_data->val_out = phy_read_mmd(phydev_rq, mdio_phy_id_devad(mii_data->phy_id), mii_data->reg_num);
+ } else {
+ mii_data->val_out = phy_read(phydev_rq, mii_data->reg_num);
+ }
+
return 0;

case SIOCSMIIREG:
--
Best regards,
grygorii

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