netdev - Re: RTL8156(A|B) chip requires r8156 to be force loaded to operate

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Date:   Mon, 3 Jan 2022 00:21:50 +0100
From:   Andreas Seiderer <x64multicore@...glemail.com>
To:     Jakub Kicinski <kuba@...nel.org>, Ryan Lahfa <ryan@...fa.xyz>
Cc:     netdev@...r.kernel.org, Hayes Wang <hayeswang@...ltek.com>
Subject: Re: RTL8156(A|B) chip requires r8156 to be force loaded to operate

On 28 Dec 2021 03:21 Jakub Kicinski wrote:
> On Fri, 24 Dec 2021 21:30:18 +0100 Ryan Lahfa wrote:
>> Hi all,
>>
>> I recently bought an USB-C 2.5Gbps external network card, which shows in
>> `lsusb` as:
>>
>>> Bus 002 Device 003: ID 0bda:8156 Realtek Semiconductor Corp. USB 10/100/1G/2.5G LAN
>> By default, on my distribution (NixOS "21.11pre319254.b5182c214fa")'s
>> latest kernel (`pkgs.linuxPackages_latest`) which shows in `uname -nar`
>> as:
>>
>>> Linux $machine 5.15.10 #1-NixOS SMP Fri Dec 17 09:30:17 UTC 2021 x86_64 GNU/Linux
>> The network card is loaded with `cdc_ncm` driver and is unable to detect
>> any carrier even when one is actually plugged in, I tried multiple
>> things, I confirmed independently that the carrier is working.
>>
>> Through further investigations and with the help of a user on
>> Libera.Chat #networking channel, we blacklisted `cdc_ncm`, but nothing
>> get loaded in turn.
>>
>> Then, I forced the usage of r8152 for the device 0bda:8156 using `echo
>> 0bda 8156 > /sys/bus/usb/drivers/r8152/new_id`, and... miracle.
>> Everything just worked.
>>
>> I am uncertain whether this falls in kernel's responsibility or not, it
>> seems indeed that my device is listed for r8152: https://github.com/torvalds/linux/blob/master/drivers/net/usb/r8152.c#L9790 introduced by this commit https://github.com/torvalds/linux/commit/195aae321c829dd1945900d75561e6aa79cce208 if I understand well, which is tagged for 5.15.
>>
>> I am curious to see how difficult would that be to write a patch for
>> this and fix it, meanwhile, here is my modest contribution with this bug
>> report, hopefully, this is the right place for them.
> Can you please share the output of lsusb -d '0bda:8156' -vv ?
>
> Adding Hayes to the CC list.
>

Hi,

I recently faced a similar problem and it could be caused by some energy 
saving function of TLP. Please see the solution at: 
https://forum.manjaro.org/t/no-carrier-network-link-problem-with-usb-2-5-gbit-lan-adapter-realtek-rtl8156b-on-x86-64/97195

I hope this is helpful for you.


Best regards,

Andreas Seiderer


PS: I post you the output of lsusb of my LAN adapter (MAC address 
changed) if you still need it:

Bus 002 Device 002: ID 0bda:8156 Realtek Semiconductor Corp. USB 
10/100/1G/2.5G LAN
Device Descriptor:
   bLength                18
   bDescriptorType         1
   bcdUSB               3.20
   bDeviceClass            0
   bDeviceSubClass         0
   bDeviceProtocol         0
   bMaxPacketSize0         9
   idVendor           0x0bda Realtek Semiconductor Corp.
   idProduct          0x8156
   bcdDevice           31.00
   iManufacturer           1 Realtek
   iProduct                2 USB 10/100/1G/2.5G LAN
   iSerial                 6 001000001
   bNumConfigurations      3
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength       0x0039
     bNumInterfaces          1
     bConfigurationValue     1
     iConfiguration          0
     bmAttributes         0xa0
       (Bus Powered)
       Remote Wakeup
     MaxPower              256mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           3
       bInterfaceClass       255 Vendor Specific Class
       bInterfaceSubClass    255 Vendor Specific Subclass
       bInterfaceProtocol      0
       iInterface              0
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x81  EP 1 IN
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x02  EP 2 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x83  EP 3 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0002  1x 2 bytes
         bInterval              11
         bMaxBurst               0
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength       0x0068
     bNumInterfaces          2
     bConfigurationValue     2
     iConfiguration          0
     bmAttributes         0xa0
       (Bus Powered)
       Remote Wakeup
     MaxPower              256mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           1
       bInterfaceClass         2 Communications
       bInterfaceSubClass     13
       bInterfaceProtocol      0
       iInterface              5 CDC Communications Control
       CDC Header:
         bcdCDC               1.10
       CDC Union:
         bMasterInterface        0
         bSlaveInterface         1
       CDC Ethernet:
         iMacAddress                      3 00E04CXXXXXX
         bmEthernetStatistics    0x0031501f
         wMaxSegmentSize               1518
         wNumberMCFilters            0x8000
         bNumberPowerFilters              0
       CDC NCM:
         bcdNcmVersion        1.00
         bmNetworkCapabilities 0x2b
           8-byte ntb input size
           max datagram size
           net address
           packet filter
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x83  EP 3 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0010  1x 16 bytes
         bInterval              11
         bMaxBurst               0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       0
       bNumEndpoints           0
       bInterfaceClass        10 CDC Data
       bInterfaceSubClass      0
       bInterfaceProtocol      1
       iInterface              0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       1
       bNumEndpoints           2
       bInterfaceClass        10 CDC Data
       bInterfaceSubClass      0
       bInterfaceProtocol      1
       iInterface              4 Ethernet Data
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x81  EP 1 IN
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x02  EP 2 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
   Configuration Descriptor:
     bLength                 9
     bDescriptorType         2
     wTotalLength       0x0062
     bNumInterfaces          2
     bConfigurationValue     3
     iConfiguration          0
     bmAttributes         0xa0
       (Bus Powered)
       Remote Wakeup
     MaxPower              256mA
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        0
       bAlternateSetting       0
       bNumEndpoints           1
       bInterfaceClass         2 Communications
       bInterfaceSubClass      6 Ethernet Networking
       bInterfaceProtocol      0
       iInterface              5 CDC Communications Control
       CDC Header:
         bcdCDC               1.10
       CDC Union:
         bMasterInterface        0
         bSlaveInterface         1
       CDC Ethernet:
         iMacAddress                      3 00E04CXXXXXX
         bmEthernetStatistics    0x0031501f
         wMaxSegmentSize               1518
         wNumberMCFilters            0x8000
         bNumberPowerFilters              0
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x83  EP 3 IN
         bmAttributes            3
           Transfer Type            Interrupt
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0010  1x 16 bytes
         bInterval              11
         bMaxBurst               0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       0
       bNumEndpoints           0
       bInterfaceClass        10 CDC Data
       bInterfaceSubClass      0
       bInterfaceProtocol      0
       iInterface              0
     Interface Descriptor:
       bLength                 9
       bDescriptorType         4
       bInterfaceNumber        1
       bAlternateSetting       1
       bNumEndpoints           2
       bInterfaceClass        10 CDC Data
       bInterfaceSubClass      0
       bInterfaceProtocol      0
       iInterface              4 Ethernet Data
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x81  EP 1 IN
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
       Endpoint Descriptor:
         bLength                 7
         bDescriptorType         5
         bEndpointAddress     0x02  EP 2 OUT
         bmAttributes            2
           Transfer Type            Bulk
           Synch Type               None
           Usage Type               Data
         wMaxPacketSize     0x0400  1x 1024 bytes
         bInterval               0
         bMaxBurst               3
Binary Object Store Descriptor:
   bLength                 5
   bDescriptorType        15
   wTotalLength       0x0016
   bNumDeviceCaps          2
   USB 2.0 Extension Device Capability:
     bLength                 7
     bDescriptorType        16
     bDevCapabilityType      2
     bmAttributes   0x00000002
       HIRD Link Power Management (LPM) Supported
   SuperSpeed USB Device Capability:
     bLength                10
     bDescriptorType        16
     bDevCapabilityType      3
     bmAttributes         0x02
       Latency Tolerance Messages (LTM) Supported
     wSpeedsSupported   0x000e
       Device can operate at Full Speed (12Mbps)
       Device can operate at High Speed (480Mbps)
       Device can operate at SuperSpeed (5Gbps)
     bFunctionalitySupport   2
       Lowest fully-functional device speed is High Speed (480Mbps)
     bU1DevExitLat          10 micro seconds
     bU2DevExitLat        2047 micro seconds
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0000
   (Bus Powered)