netdev - Re: kernel 4.18.5 Realtek 8111G network adapter stops responding under high system load

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Message-ID: <039cc66f-13b0-e745-b6ec-68f4580e90ef@maciej.szmigiero.name>
Date:   Wed, 19 Sep 2018 00:30:46 +0200
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     David Arendt <admin@...et.org>
Cc:     linux-kernel@...r.kernel.org, nic_swsd@...ltek.com,
        netdev@...r.kernel.org, Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: kernel 4.18.5 Realtek 8111G network adapter stops responding
 under high system load

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