Known Inbox-Related Issues

The following table describes known issues in this release and possible workarounds.

Internal Ref.

Bugzilla Ref.

Description

RHEL-27589

Description: mlx5 with CX6 suffers multicast packet amplification. With SR-IOV enabled, sending one multicast packet results in amplification so that millions of multicast packets are emitted.

Workaround: Use firmware version xx.41.1000

2482177

Description: RDMA device name for VFs may change after resetting all VFs at once.

Workaround: Either reset interfaces one by one with a delay in between, or use a network interface naming scheme with predictable interface names, such as NAME_PCI or NAME_GUID:

copy /lib/udev/rules.d/60-rdma-persistent-naming.rules to /etc/udev/rules.d/ and edit the last line accordingly.

Note that this will change interface names.

Description: RPM package kernel-modules-extra is required for supporting various OVS Hardware Offloads.

To use OVS Hardware Offloads, make sure to install the kernel-modules-extra RPM package which provides various kernel modules that are required for supporting this functionality.

1816660

Description: When the NUM_OF_VFS parameter configured in the Firmware (using the mstconfig tool) is higher than 64, VF LAG mode will not be supported while deploying OVS offload.

Workaround: N/A

Keywords: ConnectX-5, VF LAG, ASAP², SwitchDev

1816660

Description: An internal firmware error occurs either when attempting to disable single-root input/output virtualization or when unbinding PF using a function (such as ifdown and ip link) under the following condition:

VF LAG mode in an OVS offload deployment, where at least one VF of any PF is still bound on the host or attached to a VM.

Workaround: Unbind or detach VFs before you perform these actions as follows.

Shutdown and detach any VMs.
Remove VF LAG bond interface from OVS.
Unbind VFs, perform for each configured VF:

# echo <VF PCIe BDF> > /sys/bus/pci/drivers/mlx5_core/unbind

Disable SR-IOV, perform for each PF:

# echo 0 > /sys/class/net/<PF>/device/sriov_numvfs

Keywords: ConnectX-5, VF LAG, ASAP², SwitchDev

1284047

Description: Bandwidth degradations due to PTI (Page Table Isolation) in Intel's CPU security fix.

Keywords: Performance

1610281

Description: Setting speed to 56GbE on ConnectX-4 causes firmware syndrome (0x1a303e).

Workaround: N/A

Keywords: ConnectX-4, syndrome

1609804

Description: Kernel panic during MTU change under stress traffic.

Workaround: N/A

Keywords: Panic, MTU