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Subject: Re: kernel 4.18.5 Realtek 8111G network adapter stops responding
 under high system load
To:     "Maciej S. Szmigiero" <mail@maciej.szmigiero.name>
Cc:     linux-kernel@vger.kernel.org, nic_swsd@realtek.com,
        netdev@vger.kernel.org, Heiner Kallweit <hkallweit1@gmail.com>
References: <20180918102349.Horde.yHctatUod-_SC696oYKmySa@cloud.luxmemories.lu>
 <039cc66f-13b0-e745-b6ec-68f4580e90ef@maciej.szmigiero.name>
From:   David Arendt <admin@prnet.org>
Message-ID: <c37b0548-518c-f022-b407-6f71943b9db2@prnet.org>
Date:   Wed, 19 Sep 2018 18:34:10 +0200
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Hi,

the networking problem did not occur for 12 hours now, so I think this
patch resolved the problem.

Thanks,
David Arendt

On 9/19/18 12:30 AM, Maciej S. Szmigiero wrote:
> Hi,
>
> On 18.09.2018 12:23, David Arendt wrote:
>> Hi,
>>
>> Today I had the network adapter problems again.
>> So the patch doesn't seem to change anything regarding this problem.
>> This week my time is unfortunately very limited, but I will try to
>> find some time next weekend to look a bit more into the issue.
> If the problem is caused by missing TXCFG_AUTO_FIFO bit in TxConfig,
> as the register difference would suggest, then you can try applying
> the following patch (hack) on top of 4.18.8 that is already patched
> with commit f74dd480cf4e:
> --- a/drivers/net/ethernet/realtek/r8169.c
> +++ b/drivers/net/ethernet/realtek/r8169.c
> @@ -5043,7 +5043,8 @@
>  {
>  	/* Set DMA burst size and Interframe Gap Time */
>  	RTL_W32(tp, TxConfig, (TX_DMA_BURST << TxDMAShift) |
> -		(InterFrameGap << TxInterFrameGapShift));
> +		(InterFrameGap << TxInterFrameGapShift)
> +		| TXCFG_AUTO_FIFO);
>  }
>  
>  static void rtl_set_rx_max_size(struct rtl8169_private *tp)
>
> This hack will probably only work properly on RTL_GIGA_MAC_VER_40 or
> later NICs.
>
> Before running any tests please verify with "ethtool -d enp3s0" that
> TxConfig register now contains 0x4f000f80, as it did in the old,
> working driver version.
>
> If this does not help then a bisection will most likely be needed.
>
>> Thanks in advance,
>> David Arendt
> Maciej