netdev - Re: [PATCH net-next] r8169: avoid link-up interrupt issue on RTL8106e if user enables ASPM

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Date:   Fri, 11 Jun 2021 11:14:56 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Koba Ko <koba.ko@...onical.com>,
        Kai Heng Feng <kai.heng.feng@...onical.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] r8169: avoid link-up interrupt issue on RTL8106e
 if user enables ASPM

On 11.06.2021 10:04, Koba Ko wrote:
> On Fri, Jun 11, 2021 at 4:57 AM Heiner Kallweit <hkallweit1@...il.com> wrote:
>>
>> It has been reported that on RTL8106e the link-up interrupt may be
>> significantly delayed if the user enables ASPM L1. Per default ASPM
>> is disabled. The change leaves L1 enabled on the PCIe link (thus still
>> allowing to reach higher package power saving states), but the
>> NIC won't actively trigger it.
>>
>> Reported-by: Koba Ko <koba.ko@...onical.com>
>> Tested-by: Koba Ko <koba.ko@...onical.com>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> ---
>>  drivers/net/ethernet/realtek/r8169_main.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
>> index 64f94a3fe..6a9fe9f7e 100644
>> --- a/drivers/net/ethernet/realtek/r8169_main.c
>> +++ b/drivers/net/ethernet/realtek/r8169_main.c
>> @@ -3508,7 +3508,6 @@ static void rtl_hw_start_8106(struct rtl8169_private *tp)
>>         rtl_eri_write(tp, 0x1b0, ERIAR_MASK_0011, 0x0000);
>>
>>         rtl_pcie_state_l2l3_disable(tp);
>> -       rtl_hw_aspm_clkreq_enable(tp, true);
>>  }
> 
> As per 0866cd15029b, this also affects the intel soc idle state.
> Even the result is positive currently, I think this modification would
> have higher risk.
> 
At the time of 0866cd15029b ASPM was enabled in r8169. Interesting that
after 0866cd15029b nobody reported the link-up issue you're facing.
A few months later (with b75bb8a5b755) we had to disable ASPM again
because of several problem reports. Since then 0866cd15029b has no
practical relevance in mainline.

>>
>>  DECLARE_RTL_COND(rtl_mac_ocp_e00e_cond)
>> --
>> 2.32.0
>>