linux-kernel - Re: R8169: Network lockups in 4.18.{8,9,10} (and 4.19 dev)

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Date:   Thu, 11 Oct 2018 09:24:06 +0100
From:   Chris Clayton <chris2553@...glemail.com>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Azat Khuzhin <a3at.mail@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: R8169: Network lockups in 4.18.{8,9,10} (and 4.19 dev)



On 11/10/2018 01:12, Maciej S. Szmigiero wrote:
> On 11.10.2018 00:49, Chris Clayton wrote:
>>> Now, knowing the "right" value you can experiment with what rtl_init_rxcfg()
>>> writes (under the "default:" label for your NIC model).
>>>
>>
>> This might be more interesting. Through a combination of viewing the output from pr_notice() and the output from
>> "ethtool -d", I can see RxConfig with the following values
>>
>> 	During boot:	0x00028700
>> 	Before suspend:	0x0002870e
>> 	During resume:	0x00024000
>> 	Post resume:	0x0002870e
>>
>> As I did with 4.18.10 early on in the process, I removed the call to rtl_init_rxcfg() from rtl_hw_start() and rebuilt,
>> installed and rebooted. Now I see the following values:
>>
>> 	During boot:	0x00028700
>> 	Before suspend:	0x0002870e
>> 	During resume:	0x00024000
>> 	Post resume:	0x0002400e
>>
> 
> Now we can finally see some difference...
> Besides missing RX128_INT_EN (bit 15 or 0x8000) and RX_DMA_BURST
> (bits 8-10 or 0x700) - that rtl_init_rxcfg() would normally set so this
> is kind of expected - one can see that the working configuration
> post-resume has bit 14 (or 0x4000) set, too.
> 
> This bit is described in the driver as RX_MULTI_EN ("8111c only") and is
> set by rtl_init_rxcfg() for example for RTL_GIGA_MAC_VER_35.
> 
> RTL_GIGA_MAC_VER_35 is described in the driver as being in the same
> family as your RTL_GIGA_MAC_VER_38, so can you please try the following
> change:
> --- r8169.c
> +++ r8169.c
> @@ -4271,6 +4271,7 @@ static void rtl_init_rxcfg(struct rtl816
>  	case RTL_GIGA_MAC_VER_18 ... RTL_GIGA_MAC_VER_24:
>  	case RTL_GIGA_MAC_VER_34:
>  	case RTL_GIGA_MAC_VER_35:
> +	case RTL_GIGA_MAC_VER_38:
>  		RTL_W32(tp, RxConfig, RX128_INT_EN | RX_MULTI_EN | RX_DMA_BURST);
>  		break;
>  	case RTL_GIGA_MAC_VER_40 ... RTL_GIGA_MAC_VER_51:
> 
> This will add RX_MULTI_EN also for your chip model (you need to add back
> the call to rtl_init_rxcfg() to rtl_hw_start(), naturally).
>

That's done the trick. With the above change applied, my network runs running fine after a suspend/resume cycle and the
ping times are back in the 14-15ms range.

Chris

> If this does not help then I would try another values in the above write:
> 1) RTL_W32(tp, RxConfig, 0x00024000);
> 2) RTL_W32(tp, RxConfig, 0x00004000);
> 3) RTL_W32(tp, RxConfig, RX_DMA_BURST);
> 4) RTL_W32(tp, RxConfig, RX128_INT_EN);
> 
>> Chris
> 
> Maciej
>