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Date: Thu, 27 Aug 2020 12:46:49 -0400 From: Jody Bruchon <jody@...ybruchon.com> To: linux-kernel@...r.kernel.org Cc: jody@...ybruchon.com Subject: Help with Realtek RTL8156 USB 2.5G NIC not working and cdc_ncm syslog flooding Note: please CC me in replies since I'm not subscribed to LKML. I have a RTL8156-based USB 3.0 to 2.5G NBASE-T ethernet adapter made by Plugable and I'm using a recently compiled Linux 5.8.1 (I checked changelogs up to the current 5.8.5 release and didn't see anything relevant mentioned). It's supposed to work with the cdc_ncm driver, but the sheer amount of syslog spam by cdc_ncm regardless of link state is astonishing, and the adapter behaves erratically as well. This is the log spam from one single second with the interface up but no network cable attached: [173944.031631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.063629] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.095630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.127628] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.159630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.191629] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.223631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.255631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.287630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.319630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.351627] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.383633] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.415627] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.447627] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.479631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.511631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.543630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.575629] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.607628] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.639628] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.671630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.703629] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.735631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.767631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.799622] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.831629] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.863630] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.895634] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.927631] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.959633] cdc_ncm 2-4:2.0 usb0: network connection: disconnected [173944.991628] cdc_ncm 2-4:2.0 usb0: network connection: disconnected It's just as bad when the link is up: [174451.007591] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.039592] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.071637] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.103630] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.135630] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.167630] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.199631] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.231622] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.263634] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.295631] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.327629] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.359628] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.391631] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.423629] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.455631] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.487630] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.519632] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.551629] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.583629] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.615634] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.647631] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.679628] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.711632] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.743631] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.775630] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.807627] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.839630] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.871628] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.903631] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.935628] cdc_ncm 2-4:2.0 usb0: network connection: connected [174451.967629] cdc_ncm 2-4:2.0 usb0: 2500 mbit/s downlink 2500 mbit/s uplink [174451.999633] cdc_ncm 2-4:2.0 usb0: network connection: connected This is what the lsusb -v output looks like for the device: Bus 002 Device 002: ID 0bda:8156 Realtek Semiconductor Corp. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.20 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 9 idVendor 0x0bda Realtek Semiconductor Corp. idProduct 0x8156 bcdDevice 30.00 iManufacturer 1 Realtek iProduct 2 USB 10/100/1G/2.5G LAN iSerial 6 000000001 bNumConfigurations 3 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 57 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 128mA 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 4 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 4 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 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 104 bNumInterfaces 2 bConfigurationValue 2 iConfiguration 0 bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 128mA 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 8CAE4CDD0417 bmEthernetStatistics 0x0031500f wMaxSegmentSize 1518 wNumberMCFilters 0x8000 bNumberPowerFilters 0 UNRECOGNIZED CDC: 06 24 1a 00 01 2b 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 8 bMaxBurst 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 1 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused 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 4 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 4 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 98 bNumInterfaces 2 bConfigurationValue 3 iConfiguration 0 bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 128mA 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 8CAE4CDD0417 bmEthernetStatistics 0x0031500f 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 8 bMaxBurst 1 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 10 CDC Data bInterfaceSubClass 0 Unused bInterfaceProtocol 0 iInterface 4 Ethernet Data Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0400 1x 1024 bytes bInterval 0 bMaxBurst 4 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 4 Device Status: 0x001c (Bus Powered) Test Mode If I do this, then it switches from 'usb0' to 'eth1': /sys/devices/pci0000:00/0000:00:15.0/usb2/2-4 # echo 3 > bConfigurationValue Regardless of whether I try to use it as eth1 or usb0, it does not communicate. I have turned off USB autosuspend for the device, but with no change: /sys/devices/pci0000:00/0000:00:15.0/usb2/2-4 # cat power/control on At this point, I don't know what else to try. My understanding is that cdc_ncm supports this device and the Realtek-provided driver shouldn't be needed anymore. The r8152 driver already in the kernel doesn't pick up this device. Any help would be greatly appreciated. - Jody Bruchon
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