netdev - Re: [regression] r8169 without realtek

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Date:   Fri, 17 Aug 2018 10:39:17 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Jouni Mettälä <jtmettala@...il.com>,
        netdev@...r.kernel.org, hkallweit1@...il.com
Subject: Re: [regression] r8169 without realtek_phy

+Heiner,

On 08/17/2018 01:33 AM, Jouni Mettälä wrote:
> There is network regression for me. 4.18 was good. 4.18+ is bad. There
> was some phy changes in r8169 driver. Fortunately adding
> CONFIG_REALTEK_PHY=m to kernel config fixed the regression. 
> 
> Should r8169 depend on realtek_phy? Does that breaks something else?

That would be reasonable given that there is now a hard dependency on
the r8169 driver having the right PHY driver, since the Generic PHY
driver likely wont' do all the workarounds. Heiner, what do you think?

> 
> Network doesn't work with Generic PHY (output of dmesg)
> Generic PHY r8169-300:00: attached PHY driver [Generic PHY]
> (mii_bus:phy_addr=r8169-300:00, irq=IGNORE)
> 
> When realtek_phy is compiled, r8169 automatically uses it.
> RTL8211B Gigabit Ethernet r8169-300:00: attached PHY driver [RTL8211B
> Gigabit Ethernet] (mii_bus:phy_addr=r8169-300:00, irq=IGNORE)
> 
> Here is Ethernet controller's lspci for reference:
> 03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168]
> (rev 01)
> 	Subsystem: ABIT Computer Corp. RTL8111/8168/8411 PCI Express
> Gigabit Ethernet Controller [147b:1078]
> 	Flags: bus master, fast devsel, latency 0, IRQ 27
> 	I/O ports at ce00 [size=256]
> 	Memory at fddff000 (64-bit, non-prefetchable) [size=4K]
> 	[virtual] Expansion ROM at fdd00000 [disabled] [size=64K]
> 	Capabilities: [40] Power Management version 2
> 	Capabilities: [48] Vital Product Data
> 	Capabilities: [50] MSI: Enable+ Count=1/2 Maskable- 64bit+
> 	Capabilities: [60] Express Endpoint, MSI 00
> 	Capabilities: [84] Vendor Specific Information: Len=4c <?>
> 	Capabilities: [100] Advanced Error Reporting
> 	Capabilities: [12c] Virtual Channel
> 	Capabilities: [148] Device Serial Number 28-00-00-00-00-00-00-
> 00
> 	Capabilities: [154] Power Budgeting <?>
> 	Kernel driver in use: r8169
> 	Kernel modules: r8169
> 


-- 
Florian