Public bug reported:
Works with focal kernel 5.4.0-80 Broken with focal kernel 5.4.0-88 On a Dell R720 with the BCM57800 based 1/10 Gigabit Integrated Network cards Kernel 5.11.22-3 causes half of the network interfaces to disappear specifically the 1gb ports. Commands like "ip link show" and "dmesg" no longer show eno3 and eno4 nor any other interface name for these ports. I've read the note in the release notes and this does not appear to be a case of the interface changing names, the 3rd and 4th interface don't show up at all. The card is based on the BCM57800 chipset and has two SFP+ and two gigabit ports on the same card. Commands like "ip link show" no longer show ports 3 and 4. "lspci" still shows four items. dmesg only shows the first two interfaces. This problem seems to be known upstream, and seems to be a regression. More information at https://bugzilla.proxmox.com/show_bug.cgi?id=3558 This is being seen at a customer during an openstack install. It would be appreciated if a workaround could be provided or the fix could be prioritized. Using standard Focal 20.04 LTS kernel (it installs ok with the working kernel then upgrades to the non-working one -- this is done through maas and is difficult to control). Tested other kernels like hwe-* and all seem to be affected too. Client does not want to disable SRIOV on whole card and also cannot disable only ports 3/4 (the bios will not allow it). ** Affects: linux (Ubuntu) Importance: Undecided Status: Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1945707 Title: BCM57800 SRIOV bug causes interfaces to disappear To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1945707/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
