netdev - Re: [PATCH net] r8169: fix rtl8125b dmar pte write access not set error

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Date:   Sat, 15 Oct 2022 10:18:11 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Hau <hau@...ltek.com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "grundler@...omium.org" <grundler@...omium.org>
Subject: Re: [PATCH net] r8169: fix rtl8125b dmar pte write access not set
 error

On 13.10.2022 08:04, Hau wrote:
>> On 12.10.2022 09:59, Hau wrote:
>>>>
>>>> On 04.10.2022 10:10, Chunhao Lin wrote:
>>>>> When close device, rx will be enabled if wol is enabeld. When open
>>>>> device it will cause rx to dma to wrong address after pci_set_master().
>>>>>
>>>>> In this patch, driver will disable tx/rx when close device. If wol
>>>>> is eanbled only enable rx filter and disable rxdv_gate to let
>>>>> hardware can receive packet to fifo but not to dma it.
>>>>>
>>>>> Fixes: 120068481405 ("r8169: fix failing WoL")
>>>>> Signed-off-by: Chunhao Lin <hau@...ltek.com>
>>>>> ---
>>>>>  drivers/net/ethernet/realtek/r8169_main.c | 14 +++++++-------
>>>>>  1 file changed, 7 insertions(+), 7 deletions(-)
>>>>>
>>>>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c
>>>>> b/drivers/net/ethernet/realtek/r8169_main.c
>>>>> index 1b7fdb4f056b..c09cfbe1d3f0 100644
>>>>> --- a/drivers/net/ethernet/realtek/r8169_main.c
>>>>> +++ b/drivers/net/ethernet/realtek/r8169_main.c
>>>>> @@ -2239,6 +2239,9 @@ static void rtl_wol_enable_rx(struct
>>>> rtl8169_private *tp)
>>>>>  	if (tp->mac_version >= RTL_GIGA_MAC_VER_25)
>>>>>  		RTL_W32(tp, RxConfig, RTL_R32(tp, RxConfig) |
>>>>>  			AcceptBroadcast | AcceptMulticast | AcceptMyPhys);
>>>>> +
>>>>> +	if (tp->mac_version >= RTL_GIGA_MAC_VER_40)
>>>>> +		RTL_W32(tp, MISC, RTL_R32(tp, MISC) & ~RXDV_GATED_EN);
>>>>
>>>> Is this correct anyway? Supposedly you want to set this bit to disable DMA.
>>>>
>>> If wol is enabled, driver need to disable hardware rxdv_gate for receiving
>> packets.
>>>
>> OK, I see. But why disable it here? I see no scenario where rxdv_gate would
>> be enabled when we get here.
>>
> rxdv_gate will be enabled in rtl8169_cleanup(). When suspend or close and wol is enabled
> driver will call rtl8169_down() -> rtl8169_cleanup()-> rtl_prepare_power_down()-> rtl_wol_enable_rx().
> So disabled rxdv_gate in rtl_wol_enable_rx() for receiving packets.
> 
rtl8169_cleanup() skips the call to rtl_enable_rxdvgate() when being called from
rtl8169_down() and wol is enabled. This means rxdv gate is still disabled.