Public bug reported: It looks like TCP rx and tx checksum offloading is broken on the TB18 dock's ethernet adapter. For example downloading a large file such as the Ubuntu ISO, and then running an md5sum on it yields the incorrect md5sum. This is because rx-checksumming: on tx-checksumming: on and both set to on by default.
Running sudo ethtool -K <TB18 eth device> tx off rx off, allows the download to complete correctly. This is very bad since this can cause very bad untrustworthy behavior. This was conducted using an Dell Precision 7530 on Ubuntu 18.04.1 with kernel 4.15.0-34-generic. Looks like the fix done with https://bugs.launchpad.net/dell- sputnik/+bug/1729674 needs to be extended for the TB18 which has a different serial (see "lsusb -v" output): Bus 004 Device 004: ID 0bda:8153 Realtek Semiconductor Corp. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 3.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 9 idVendor 0x0bda Realtek Semiconductor Corp. idProduct 0x8153 bcdDevice 30.11 iManufacturer 1 Realtek iProduct 2 USB 10/100/1000 LAN iSerial 6 000002000000 ... This bug also affects https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1785778 ** Affects: dell-sputnik Importance: Undecided Status: New ** Affects: ubuntu Importance: Undecided Status: New ** Information type changed from Private Security to Public ** Description changed: - It looks like TCP rx and tx checksum offloading is broken on the TB16 dock's ethernet adapter. For example downloading a large file such as the Ubuntu ISO, and then running an md5sum on it yields the incorrect md5sum. This is because + It looks like TCP rx and tx checksum offloading is broken on the TB18 dock's ethernet adapter. For example downloading a large file such as the Ubuntu ISO, and then running an md5sum on it yields the incorrect md5sum. This is because rx-checksumming: on tx-checksumming: on and both set to on by default. Running sudo ethtool -K <TB18 eth device> tx off rx off, allows the download to complete correctly. This is very bad since this can cause very bad untrustworthy behavior. This was conducted using an Dell Precision 7530 on Ubuntu 18.04.1 with kernel 4.15.0-34-generic. Looks like the fix done with https://bugs.launchpad.net/dell- sputnik/+bug/1729674 needs to be extended for the TB18 which has a different serial (see "lsusb -v" output): - Bus 004 Device 004: ID 0bda:8153 Realtek Semiconductor Corp. + Bus 004 Device 004: ID 0bda:8153 Realtek Semiconductor Corp. Device Descriptor: - bLength 18 - bDescriptorType 1 - bcdUSB 3.00 - bDeviceClass 0 (Defined at Interface level) - bDeviceSubClass 0 - bDeviceProtocol 0 - bMaxPacketSize0 9 - idVendor 0x0bda Realtek Semiconductor Corp. - idProduct 0x8153 - bcdDevice 30.11 - iManufacturer 1 Realtek - iProduct 2 USB 10/100/1000 LAN - iSerial 6 000002000000 + bLength 18 + bDescriptorType 1 + bcdUSB 3.00 + bDeviceClass 0 (Defined at Interface level) + bDeviceSubClass 0 + bDeviceProtocol 0 + bMaxPacketSize0 9 + idVendor 0x0bda Realtek Semiconductor Corp. + idProduct 0x8153 + bcdDevice 30.11 + iManufacturer 1 Realtek + iProduct 2 USB 10/100/1000 LAN + iSerial 6 000002000000 ... This bug also affects https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1785778 ** Also affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1792574 Title: Dell TB18 dock ethernet corrupts data with hw checksum silently failing To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1792574/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
