netdev - Re: Driver support for Realtek RTL8125 2.5GB Ethernet

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Date:   Wed, 2 Oct 2019 18:22:28 +0800
From:   Jian-Hong Pan <jian-hong@...lessm.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Linux Netdev List <netdev@...r.kernel.org>,
        Yan-Hsuan Chuang <yhchuang@...ltek.com>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: Driver support for Realtek RTL8125 2.5GB Ethernet

Heiner Kallweit <hkallweit1@...il.com> 於 2019年10月2日 週三 下午1:54寫道：
>
> On 26.07.2019 21:05, Heiner Kallweit wrote:
> > On 24.07.2019 22:02, Heiner Kallweit wrote:
> >> On 24.07.2019 10:19, Jian-Hong Pan wrote:
> >>> Hi all,
> >>>
> >>> We have got a consumer desktop equipped with Realtek RTL8125 2.5GB
> >>> Ethernet [1] recently.  But, there is no related driver in mainline
> >>> kernel yet.  So, we can only use the vendor driver [2] and customize
> >>> it [3] right now.
> >>>
> >>> Is anyone working on an upstream driver for this hardware?
> >>>
> >> At least I'm not aware of any such work. Issue with Realtek is that
> >> they answer individual questions very quickly but company policy is
> >> to not release any datasheets or errata documentation.
> >> RTL8169 inherited a lot from RTL8139, so I would expect that the
> >> r8169 driver could be a good basis for a RTL8125 mainline driver.
> >>
> > Meanwhile I had a look at the RTL8125 vendor driver. Most parts are
> > quite similar to RTL8168. However the PHY handling is quite weird.
> > 2.5Gbps isn't covered by Clause 22, but instead of switching to
> > Clause 45 Realtek uses Clause 22 plus a proprietary chip register
> > (for controlling the 2.5Gbps mode) that doesn't seem to be accessible
> > via MDIO bus. This may make using phylib tricky.
> >
> In case you haven't seen it yet: Meanwhile I added RTL8125 support to
> phylib and r8169, it's included in 5.4-rc1. I tested it on a
> RTL8125-based PCIe add-on card, feedback from your system would be
> appreciated. Note that you also need latest linux-firmware package
> from Sep 23rd.

Thank you!!!

I tried kernel 5.4.0-rc1 on the desktop equipped with Realtek RTL8125
2.5GB Ethernet.

$ sudo lspci -nnvs 04:00.0
[sudo] password for dev:
04:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
Device [10ec:8125] (rev 01)
    Subsystem: Acer Incorporated [ALI] Device [1025:1354]
    Flags: bus master, fast devsel, latency 0, IRQ 17
    I/O ports at 3000 [size=256]
    Memory at a4200000 (64-bit, non-prefetchable) [size=64K]
    Memory at a4210000 (64-bit, non-prefetchable) [size=16K]
    Capabilities: [40] Power Management version 3
    Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
    Capabilities: [70] Express Endpoint, MSI 01
    Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
    Capabilities: [d0] Vital Product Data
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [148] Virtual Channel
    Capabilities: [168] Device Serial Number 01-00-00-00-68-4c-e0-00
    Capabilities: [178] Alternative Routing-ID Interpretation (ARI)
    Capabilities: [188] Single Root I/O Virtualization (SR-IOV)
    Capabilities: [1c8] Transaction Processing Hints
    Capabilities: [254] Latency Tolerance Reporting
    Capabilities: [25c] L1 PM Substates
    Capabilities: [26c] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
    Kernel driver in use: r8169
    Kernel modules: r8169

Module r8169 works for it.

$ dmesg | grep r8169
[   19.631623] libphy: r8169: probed
[   19.631978] r8169 0000:04:00.0 eth0: RTL8125, 94:c6:91:5f:1f:45,
XID 609, IRQ 127
[   19.631983] r8169 0000:04:00.0 eth0: jumbo features [frames: 9200
bytes, tx checksumming: ko]
[   19.635492] r8169 0000:04:00.0 enp4s0: renamed from eth0
[   21.778431] RTL8125 2.5Gbps internal r8169-400:00: attached PHY
driver [RTL8125 2.5Gbps internal] (mii_bus:phy_addr=r8169-400:00,
irq=IGNORE)
[   21.871953] r8169 0000:04:00.0 enp4s0: Link is Down
[   24.668516] r8169 0000:04:00.0 enp4s0: Link is Up - 1Gbps/Full -
flow control off

Jian-Hong Pan

> >>> [1] https://www.realtek.com/en/press-room/news-releases/item/realtek-launches-world-s-first-single-chip-2-5g-ethernet-controller-for-multiple-applications-including-gaming-solution
> >>> [2] https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software
> >>> [3] https://github.com/endlessm/linux/commit/da1e43f58850d272eb72f571524ed71fd237d32b
> >>>
> >>> Jian-Hong Pan
> >>>
> >> Heiner
> >>
> > Heiner
> >
> Heiner