On 27.08.2019 10:29, shenjian (K) wrote:
>
>
> 在 2019/8/27 13:51, Heiner Kallweit 写道:
>> On 27.08.2019 04:47, Jian Shen wrote:
>>> Some ethernet drivers may call phy_start() and phy_stop() from
>>> ndo_open and ndo_close() respectively.
>>>
>>> When network cable is unconnected, and operate like below:
>>> step 1: ifconfig ethX up -> ndo_open -> phy_start ->start
>>> autoneg, and phy is no link.
>>> step 2: ifconfig ethX down -> ndo_close -> phy_stop -> just stop
>>> phy state machine.
>>> step 3: plugin the network cable, and autoneg complete, then
>>> LED for link status will be on.
>>> step 4: ethtool ethX --> see the result of "Link detected" is no.
>>>
>> Step 3 and 4 seem to be unrelated to the actual issue.
>> With which MAC + PHY driver did you observe this?
>>
> Thanks Heiner,
>
> I tested this on HNS3 driver, with two phy, Marvell 88E1512 and RTL8211.
>
> Step 3 and Step 4 is just to describe that the LED of link shows link up,
> but the port information shows no link.
>
ethtool refers to the link at MAC level. Therefore default implementation
ethtool_op_get_link just returns the result of netif_carrier_ok().
Also using PHY link status if interface is down doesn't really make sense:
- phylib state machine isn't running, therefore PHY status doesn't get updated
- often MAC drivers shut down parts of the MAC on ndo_close, this typically
makes the internal MDIO bus unaccessible
So just remove steps 3 and 4. The patch itself is fine with me.
>
>>> This patch forces phy suspend even phydev->link is off.
>>>
>>> Signed-off-by: Jian Shen <shenjia...@huawei.com>
>>> ---
>>> drivers/net/phy/phy.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>>> index f3adea9..0acd5b4 100644
>>> --- a/drivers/net/phy/phy.c
>>> +++ b/drivers/net/phy/phy.c
>>> @@ -911,8 +911,8 @@ void phy_state_machine(struct work_struct *work)
>>> if (phydev->link) {
>>> phydev->link = 0;
>>> phy_link_down(phydev, true);
>>> - do_suspend = true;
>>> }
>>> + do_suspend = true;
>>> break;
>>> }
>>>
>>>
>> Heiner
>>
>>
>
>
