linux-kernel - Re: [PATCH NET] net/hns:bugfix of ethtool -t phy self

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Date:   Wed, 21 Jun 2017 10:03:29 +0800
From:   l00371289 <linyunsheng@...wei.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Florian Fainelli <f.fainelli@...il.com>, <davem@...emloft.net>,
        <huangdaode@...ilicon.com>, <xuwei5@...ilicon.com>,
        <liguozhu@...ilicon.com>, <Yisen.Zhuang@...wei.com>,
        <gabriele.paoloni@...wei.com>, <john.garry@...wei.com>,
        <linuxarm@...wei.com>, <salil.mehta@...wei.com>,
        <lipeng321@...wei.com>, <yankejian@...wei.com>,
        <tremyfr@...il.com>, <xieqianqian@...wei.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH NET] net/hns:bugfix of ethtool -t phy self_test

Hi, Andrew

On 2017/6/20 21:27, Andrew Lunn wrote:
> On Tue, Jun 20, 2017 at 11:05:54AM +0800, l00371289 wrote:
>> hi, Florian
>>
>> On 2017/6/20 5:00, Florian Fainelli wrote:
>>> On 06/16/2017 02:24 AM, Lin Yun Sheng wrote:
>>>> This patch fixes the phy loopback self_test failed issue. when
>>>> Marvell Phy Module is loaded, it will powerdown fiber when doing
>>>> phy loopback self test, which cause phy loopback self_test fail.
>>>>
>>>> Signed-off-by: Lin Yun Sheng <linyunsheng@...wei.com>
>>>> ---
>>>>  drivers/net/ethernet/hisilicon/hns/hns_ethtool.c | 16 ++++++++++++++--
>>>>  1 file changed, 14 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
>>>> index b8fab14..e95795b 100644
>>>> --- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
>>>> +++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
>>>> @@ -288,9 +288,15 @@ static int hns_nic_config_phy_loopback(struct phy_device *phy_dev, u8 en)
>>>
>>> The question really is, why is not this properly integrated into the PHY
>>> driver and PHYLIB such that the only thing the Ethernet MAC driver has
>>> to call is a function of the PHY driver putting it in self-test?
>> Do you meaning calling phy_dev->drv->resume and phy_dev->drv->suspend function?
> 
> No. Florian is saying you should add support for phylib and the
> drivers to enable/disable loopback.
> 
> The BMCR loopback bit is pretty much standardised. So you can
> implement a genphy_loopback(phydev, enable), which most drivers can
> use. Those that need there own can implement it in there driver.

I tried to add the genphy_loopback support you mentioned, please look
at it if that is what you mean. If Yes, I will try to send out a new patch.

Best Regards
Yinsheng Lin

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 1219eea..54fecad 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1628,6 +1628,31 @@ static int gen10g_resume(struct phy_device *phydev)
        return 0;
 }

+int genphy_loopback(struct phy_device *phydev, bool enable)
+{
+       int value;
+
+       mutex_lock(&phydev->lock);
+
+       if (enable) {
+               value = phy_read(phydev, MII_BMCR);
+               phy_write(phydev, MII_BMCR, value | BMCR_LOOPBACK);
+       } else {
+               value = phy_read(phydev, MII_BMCR);
+               phy_write(phydev, MII_BMCR, value & ~BMCR_LOOPBACK);
+       }
+
+       mutex_unlock(&phydev->lock);
+
+       return 0;
+}
+EXPORT_SYMBOL(genphy_loopback);
+
+static int gen10g_loopback(struct phy_device *phydev, bool enable)
+{
+       return 0;
+}
+
 static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
 {
        /* The default values for phydev->supported are provided by the PHY
@@ -1874,6 +1899,7 @@ void phy_drivers_unregister(struct phy_driver *drv, int n)
        .read_status    = genphy_read_status,
        .suspend        = genphy_suspend,
        .resume         = genphy_resume,
+       .set_loopback   = genphy_loopback,
 }, {
        .phy_id         = 0xffffffff,
        .phy_id_mask    = 0xffffffff,
@@ -1885,6 +1911,7 @@ void phy_drivers_unregister(struct phy_driver *drv, int n)
        .read_status    = gen10g_read_status,
        .suspend        = gen10g_suspend,
        .resume         = gen10g_resume,
+       .set_loopback   = gen10g_loopback,
 } };

 static int __init phy_init(void)
diff --git a/include/linux/phy.h b/include/linux/phy.h
index e76e4ad..fc7a5c8 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -639,6 +639,7 @@ struct phy_driver {
        int (*set_tunable)(struct phy_device *dev,
                            struct ethtool_tunable *tuna,
                            const void *data);
+       int (*set_loopback(struct phy_device *dev, bool enable);
 };
 #define to_phy_driver(d) container_of(to_mdio_common_driver(d),                \
                                      struct phy_driver, mdiodrv)