Hello Sergei,
On 05/26/2018 10:50 PM, Sergei Shtylyov wrote:
> On 05/24/2018 02:11 PM, Vladimir Zapolskiy wrote:
>
>> The change replaces a custom implementation of .set_link_ksettings
>> callback with a shared phy_ethtool_set_link_ksettings(), this fixes
>> sleep in atomic context bug, which is encountered every time when link
>> settings are changed by ethtool.
>
> Seeing it now...
>
>> Now duplex mode setting is enforced in ravb_adjust_link() only, also
>> now TX/RX is disabled when link is put down or modifications to E-MAC
>> registers ECMR and GECMR are expected for both cases of checked and
>> ignored link status pin state from E-MAC interrupt handler.
>>
>> Signed-off-by: Vladimir Zapolskiy <vladimir_zapols...@mentor.com>
>> ---
>> drivers/net/ethernet/renesas/ravb_main.c | 58
>> +++++++++-----------------------
>> 1 file changed, 15 insertions(+), 43 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/renesas/ravb_main.c
>> b/drivers/net/ethernet/renesas/ravb_main.c
>> index 3d91caa44176..0d811c02ff34 100644
>> --- a/drivers/net/ethernet/renesas/ravb_main.c
>> +++ b/drivers/net/ethernet/renesas/ravb_main.c
>> @@ -980,6 +980,13 @@ static void ravb_adjust_link(struct net_device *ndev)
>> struct ravb_private *priv = netdev_priv(ndev);
>> struct phy_device *phydev = ndev->phydev;
>> bool new_state = false;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&priv->lock, flags);
>> +
>> + /* Disable TX and RX right over here, if E-MAC change is ignored */
>> + if (priv->no_avb_link)
>> + ravb_rcv_snd_disable(ndev);
>>
>> if (phydev->link) {
>> if (phydev->duplex != priv->duplex) {
>> @@ -997,18 +1004,21 @@ static void ravb_adjust_link(struct net_device *ndev)
>> ravb_modify(ndev, ECMR, ECMR_TXF, 0);
>> new_state = true;
>> priv->link = phydev->link;
>> - if (priv->no_avb_link)
>> - ravb_rcv_snd_enable(ndev);
>> }
>> } else if (priv->link) {
>> new_state = true;
>> priv->link = 0;
>> priv->speed = 0;
>> priv->duplex = -1;
>> - if (priv->no_avb_link)
>> - ravb_rcv_snd_disable(ndev);
>> }
>>
>> + /* Enable TX and RX right over here, if E-MAC change is ignored */
>> + if (priv->no_avb_link && phydev->link)
>> + ravb_rcv_snd_enable(ndev);
>> +
>> + mmiowb();
>> + spin_unlock_irqrestore(&priv->lock, flags);
>> +
>
> I like this part. :-)
>
A weight off my mind :) And I hope that this change will remain the less
questionable one, other ones from the series are trivial.
Anyway I hope it is understandable that this part of the change can not
be simply extracted from the rest one below, otherwise there'll be bugs of
another type intorduced.
>> if (new_state && netif_msg_link(priv))
>> phy_print_status(phydev);
>> }
>> @@ -1096,44 +1106,6 @@ static int ravb_phy_start(struct net_device *ndev)
>> return 0;
>> }
>>
>> -static int ravb_set_link_ksettings(struct net_device *ndev,
>> - const struct ethtool_link_ksettings *cmd)
>> -{
>> - struct ravb_private *priv = netdev_priv(ndev);
>> - unsigned long flags;
>> - int error;
>> -
>> - if (!ndev->phydev)
>> - return -ENODEV;
>> -
>> - spin_lock_irqsave(&priv->lock, flags);
>> -
>> - /* Disable TX and RX */
>> - ravb_rcv_snd_disable(ndev);
>> -
>> - error = phy_ethtool_ksettings_set(ndev->phydev, cmd);
>> - if (error)
>> - goto error_exit;
>> -
>> - if (cmd->base.duplex == DUPLEX_FULL)
>> - priv->duplex = 1;
>> - else
>> - priv->duplex = 0;
>> -
>> - ravb_set_duplex(ndev);
>> -
>> -error_exit:
>> - mdelay(1);
>> -
>> - /* Enable TX and RX */
>> - ravb_rcv_snd_enable(ndev);
>> -
>> - mmiowb();
>> - spin_unlock_irqrestore(&priv->lock, flags);
>> -
>> - return error;
>> -}
>> -
>
> But this part is clearly lumping it all together...
Please elaborate.
>
> [...]
>> @@ -1357,7 +1329,7 @@ static const struct ethtool_ops ravb_ethtool_ops = {
>> .set_ringparam = ravb_set_ringparam,
>> .get_ts_info = ravb_get_ts_info,
>> .get_link_ksettings = phy_ethtool_get_link_ksettings,
>> - .set_link_ksettings = ravb_set_link_ksettings,
>> + .set_link_ksettings = phy_ethtool_set_link_ksettings,
>
> Should have been a part of the final patch in the fix/enhancement chain...
Please elaborate.
Do you mean that firstly I have to make erroneous ravb_set_link_ksettings()
to look similar to phy_ethtool_set_link_ksettings() and then remove it?
As I see it in the current context (removal of ravb_set_duplex() call and
so on), the problem with this approach is that the actual fix change will
be done on top of a number of enchancement changes, thus it contradicts to
the accepted development/maintenace model "fixes first", and most probably
it won't be possible to backport the real fix, however this sole change can
be backported.
>
>> .get_wol = ravb_get_wol,
>> .set_wol = ravb_set_wol,
>> };
>
--
With best wishes,
Vladimir
