Known Issues

NVIDIA MLNX_EN Documentation Rev 5.4-3.7.5.0 LTS

The following is a list of general limitations and known issues of the current version of the release.For the list of old known issues, please refer to NVIDIA EN Archived Known Issues file at: http://www.mellanox.com/pdf/prod_software/MLNX_EN_Archived_Known_Issues.pdf

Internal Ref. Number

Issue

3253255

Description: RHEL 7 does not include built-in support for Python3. There are two potential ways to install it, and both install a package with a different name:
1. EPEL for RHEL7: python36
2. Rhel extra repository

Python3 support is needed for using Pyverbs and the Python support of Open vSwitch.

MLNX_OFED assumes that on RHEL7.x, if using Python3, that python36 from EPEL is used (otherwise the optional Python3 support cannot be used).

Workaround: To use Python3 support on RHEL7, install python36 from the RHEL7 EPEL repository.

Keywords: RHEL7, Python3

Discovered in Release: 5.4-3.6.8.1

3201193

Description: When installing version 5.4-3.5.8.0 using the yam intallation method will produce the following error, on some systems:
Failed: pcp-pmda-infiniband-5.3.5-8.el9.x86_64.

Workaround: Uninstall the pcp-pmda-infiniband package and rerun installation.

Keywords: Installation

Discovered in Release: 5.4-3.5.8.0

3200967

Description: kernel-macros package does not support building with KMP enabled. KMP needs to be disabled.

Workaround: Build and install the package with KMP disabled (without --kmp flag).

Keywords: Installation

Discovered in Release: 5.4-3.5.8.0

3175833

Description: Using RHEL 7.9 with Errata kernel may require add-kernel-support flag, while installing the package.

Workaround: N/A

Keywords: Installation

Discovered in Release: 5.4-3.5.8.0

3179313

Description: On RHEL 9.0, unbound-devel package is missing to build OVS-DPDK. OVS-DPDK will be disabled for this release until RHEL provides the missing package.

Workaround: Manually install unbound-devel prior to the installation.

Keywords: OVS DPDK

Discovered in Release: 5.4-3.5.8.0

2657392

Description: OFED installation caused CIFS to break in RHEL 8.4 and above. A dummy module was added so that CIFS will be disabled after OFED installation in RHEL 8.4 and above.

Workaround: N/A

Keywords: Installation, RHEL, CIFS

Discovered in Release: 5.4-0.5.1.1

2782406

Description: Running yum update will upgrade kylin-release to a higher version. The version of this package is used for kylin10sp2 detection so the script will detect kylin 10 instead of kylin10sp2 and use its repository by mistake.

Workaround: Because there are no special cases for kylin10sp2, the repository that was detected with adding --add-kernel-support to the installation command can be used.

Keywords: Upgrade, kylin

Discovered in Release: 5.4-3.0.3.0

2752622

Description: On SLES 15, the inbox modules in the directory mlxsw (such as mlxsw_spectrum) are not supported. If they are installed when installing MLNX_OFED, they will no longer work (as they depend on a different version of the mlx* modules) and may cause an error at time of installation.

Workaround: Either remove the package kernel-default-extra or manually remove them: rm /lib/modules/`uname -r`/kernel/drivers/net/ethernet/mellanox/mlxsw/*.ko

Keywords: Installation

Discovered in Release: 5.4-3.0.3.0

2755632

Description: On dual port cards with SR-IOV, when one port link is configured to InfiniBand and the other port link is configured to Ethernet, the Ethernet port will not be able to support VST and QinQ.

Workaround: N/A

Keywords: SR-IOV, VST, QinQ

Discovered in Release: 5.4-3.0.3.0

2780436

Description: Non-default MTU (>1500) is not supported with IPsec crypto offload and may cause packet drops.

Workaround: N/A

Keywords: IPsec, Crypto Offload, MTU

Discovered in Release: 5.4-3.0.3.0

2726021

Description: Building packages on openEuler with kmp enabled requires kernel-rpm-macros package installed. kernel-rpm-macros-30-13.oe1 does not support -p option and kernel-rpm-macros-30-18.oe1 should be installed instead.
On kylin OS, the version of kernel-rpm-macros package does not support -p option needed to support kmp, so it will stay disabled.

Workaround: N/A

Keywords: Installation, openEuler

Discovered in Release: 5.4-3.0.3.0

Internal Ref. Number

Issue

2750653

Description: Running fragmented traffic in RHEL 8.3 (4.18.0-240.el8.x86_64) may cause call trace in build_skb.

Workaround: Update to RHEL 8.3 z-stream 4.18.0-240.22.1.el8_3.x86_64.

Keywords: RHEL 8.3, Kernel Panic, Call Trace, fr

Discovered in Release: 5.4-1.0.3.0

2629375

Description: Matching on CT label is only supported when matching on lower 32 bits. Full match on all 128 bits of CT label is not supported.

Workaround: N/A

Keywords: ASAP2, Connection Tracking, Label

Discovered in Release: 5.4-1.0.3.0

2707997

Description: Installation in the package manager mode under SLES 15.x may require user-intervention if the original libibverbs is installed.

Workaround: zypper install --force-resolution mlnx-ofed-all

Keywords: Installation, libibverbs

Discovered in Release: 5.4-1.0.3.0

2708531

Description: Installation in the package manager mode under SLES 15.x may require user-intervention if the original libopenvswitch is installed.

Workaround: zypper install --force-resolution mlnx-ofed-all

Keywords: Installation

Discovered in Release: 5.4-1.0.3.0

2703043

Description: Congested TCP lock for kTLS TX device offload traffic compromises the performance.

Workaround: Disable TCP selective acknowledgement: echo 0 > /proc/sys/net/ipv4/tcp_sack

Keywords: kTLS TX

Discovered in Release: 5.4-1.0.3.0

2676405

Description: If the package interface-rename is active (on XenServer, for example), the interface renaming by the OFED will not be done to eliminate conflicts.

Workaround: N/A

Keywords: Interface Renaming

Discovered in Release: 5.4-1.0.3.0

2687943

Description: Offload of rules which redirect from VF on one PF to VF on second PF is not supported on socket-direct devices.

Workaround: N/A

Keywords: ASAP2, Socket-Direct

Discovered in Release: 5.4-1.0.3.0

2677225

Description: Conducting a driver restart while in VF LAG mode may cause unwanted behaviour such as kernel crashes.

Workaround: Set link down for both PFs.

Keywords: ASAP2, Bonding, Driver Restart, VF LAG

Discovered in Release: 5.4-1.0.3.0

2678672

Description: When disabling switchdev mode, the qdisc in tunnel device cannot be destroyed and mlx5e_stats_flower() is still called by OVS resulting in NULL pointer panic and memory leak.

Workaround: N/A

Keywords: SwitchDev, mlx5, Tunnel Traffic

Discovered in Release: 5.4-1.0.3.0

2566548

Description: On PPC systems when EEH is enabled, running fw sync reset (either by mlxfwreset with flag --sync 1 or by devlink dev reload action fw_activate), the EEHmay catch the PCI reset and take ownership on the flow. When run few times in sequence, the EEH may also decide to disable the device.

Workaround: Administrator may disable EEH before running firmware sync reset on the device.

Keywords: PPC, EEH

Discovered in Release: 5.4-1.0.3.0

2617950

Description: TX port timestamp feature is supported for kernel versions 3.15 and greater. On older kernel versions, the feature will not be supported and ptp_tx_* counters will not increment.

Workaround: N/A

Keywords: Ethtool

Discovered in Release: 5.4-1.0.3.0

2390731

Description: Ethtool does not display Port Speed advertised/capability above 100Gb/s over and below kernels 5.0, even when supported.

Workaround: N/A

Keywords: Ethtool, Port Speed

Discovered in Release: 5.4-1.0.3.0

Internal Ref. Number

Issue

2585575

Description: After disabling sync reset by setting enable_remote_dev_reset to false, running firmware sync reset a few times may lead to general protection fault and system may get stuck.

Workaround: N/A

Keywords: Firmware Upgrade

Discovered in Release: 5.3-1.0.0.1

2582565

Description: Conducting a firmware reset or unbinding the PF while in switchdev mode may cause a kernel crash.

Workaround: N/A

Keywords: SwitchDev, ASAP2, Unbind, Firmware Reset

Discovered in Release: 5.3-1.0.0.1

2587802

Description: PTP synchronization may be lost while using tx_port_ts private flag.

Workaround: Toggle private flag:
ethtool --set-priv-flags tx_port_ts off
ethtool --set-priv-flags tx_port_ts on
restart ptp4l application

Keywords: PTP Synchronization

Discovered in Release: 5.3-1.0.0.1

2574943

Description: When running kernel 5.8 and bellow or RHEL 8.2 and below, sampled packets do not support tunnel information.

Workaround: N/A

Keywords: ASAP2, sFLOW

Discovered in Release: 5.3-1.0.0.1

2438392

Description: VXLAN with IPsec crypto offload does not work.

Workaround: N/A

Keywords: VXLAN; IPsec crypto

Discovered in Release: 5.3-1.0.0.1

2568417

Description: Upon upgrade to version 5.3, the package manager tool will install the new packages and then remove the old packages, a depmod WARNING on "mlx5_fpga_tools" will appear. This warning can be safely ignored. mlx5_fpga_tools is a module that existed in version 5.2 and was removed in 5.3.

Workaround: N/A

Keywords: Upgrade; mlx5_fpga_tools

Discovered in Release: 5.3-1.0.0.1

2506425

Description: When installing kmod packages on EulerOS 2.0SP9 or OpenEuler 20.03, the following error appears: "modprobe: FATAL: could not get modversions of ". This error can be safely ignored. It is caused by incorrectly adding directories to a list of modules processed by /usr/sbin/weak-modules.

Workaround: N/A

Keywords: Installation; modules; kmod

Discovered in Release: 5.3-1.0.0.1

2492509

Description: When installing the driver on OpenEuler or on EulerOS 2.0SP9, rebuilding the drivers (--add-kernel-support) with the --kmp option (to create kmod packages) generates packages that are uninstallable because they have a dependency on "/sbin/depmod" that the system does not provide. This dependency is created by a buggy kmod package building tool included with the distribution.

Workaround: N/A

Keywords: add-kernel-support

Discovered in Release: 5.3-1.0.0.1

2479327

Description: On SLES 12 SP5, if the kernel was upgraded to 4.12.14-122.46, it is not possible to rebuild kernel modules (--add-kernel-support) without upgrading gcc as well to at least 4.8.5-31.23.2.

Workaround: N/A

Keywords: Upgrade; SLES 12; add-kernel-support

Discovered in Release: 5.3-1.0.0.1

2584441

Description: On SLES 12 SP5, if the kernel was upgraded to 4.12.14-122.46, it is not possible to rebuild kernel modules (--add-kernel-support) without upgrading gcc as well to at least 4.8.5-31.23.2.

Workaround: N/A

Keywords: Upgrade; SLES 12; add-kernel-support

Discovered in Release: 5.3-1.0.0.1

2460865

Description: When setting MTU to low values, such as 68 bytes, packets may fail on oversize.

Workaround: N/A

Keywords: MTU

Discovered in Release: 5.3-1.0.0.1

2383318

Description: On kernels based on RedHat 7.2, the "tx_port_ts" feature, as set by ethtool —set-priv-flags, is disabled.

Workaround: N/A

Keywords: RedHat; tx_port_ts

Discovered in Release: 5.3-1.0.0.1

2575647

Description: An OvS-DPDK crash might occur while doing live-migration for VMs that use virtio-interfaces that are accelerated using OvS-DPDK vDPA ports.

Workaround: N/A

Keywords: OvS-DPDK vDPA, Live-migration

Discovered in Release: 5.3-1.0.0.1

Internal Ref. Number

Issue

2395082

Description: A call trace may take place when moving from SwitchDev mode back to Legacy mode in Kernel v5.9 due to a kernel issue in tcf_block_unbind.

Workaround: N/A

Keywords: ASAP2;SwitchDev; call trace; kernel; tcf_block_unbind

Discovered in Release: 5.2-1.0.4.0

Internal Ref. Number

Issue

2209987

Description: aRFS feature (activated using "ethtool ntuple on") is disabled for kernel 4.1 or below.

Workaround: N/A

Keywords: aRFS

Discovered in Release: 5.1-1.0.4.0

2248996

Description: Downgrading the firmware version for ConnectX-6 cards using "install --fw-update-only --force-fw-update" fails.

Workaround: Manually downgrade the firmware version - please see Firmware Update Instructions.

Keywords: Firmware, ConnectX-6

Discovered in Release: 5.1-1.0.4.0

2175930

Description: When using MLNX_EN v5.1 on PPC architectures with kernels v5.5 or v5.6 and an old ethtool utility, a harmless warning call trace may appear in the dmesg due to mismatch between user space and kernel. The warning call trace mentions ethtool_notify.

Workaround: Update the ethtool utility to version 5.6 on such systems in order to avoid the call trace.

Keywords: PPC, ethtool_notify, kernel

Discovered in Release: 5.1-1.0.4.0

2198764

Description: If MLNX_EN is installed on a Debian or Ubuntu system that is run in chroot environment, the openibd service will not be enabled. If the chroot files are being used as a base of a full system, the openibd service is left disabled.

Workaround: Currently, openibd is a sysv-init script that you can enable manually by running: update-rc.d openibd defaults

Keywords: chroot, Debian , Ubuntu, openibd

Discovered in Release: 5.1-1.0.4.0

2237134

Description: Running connection tracking (CT) with FW steering may cause CREATE_FLOW_TABLE command to fail with syndrome.

Workaround: Configure OVS to use a single handler-thread:

#ovs-vsctl set Open_vSwitch . other_config:n-handler-threads=1

Keywords: Connection tracking, ASAP, OVS, FW steering

Discovered in Release: 5.1-1.0.4.0

2239894

Description: Running OpenVSwitch offload with high traffic throughput can cause low insertion rate due to high CPU usage.

Workaround: Reduce the number of combined channels of the uplink using "ethtool -L".

Keywords: Insertion rate, ASAP2

Discovered in Release: 5.1-1.0.4.0

2240671

Description: Header rewrite action is not supported over RHEL/CentOS 7.4.

Workaround: N/A

Keywords: ASAP, header rewrite, RHEL, RedHat, CentOS, OS

Discovered in Release: 5.1-1.0.4.0

2242546

Description: Tunnel offload (encap/decap) may cause kernel panic if nf_tables module is not probed.

Workaround: Make sure to probe the nf_tables module before inserting any rule.

Keywords: Kernel v5.7, ASAP, kernel panic

Discovered in Release: 5.1-1.0.4.0

2143007

Description: IPsec packets are dropped during heavy traffic due to a bug in net/xfrm Linux Kernel.

Workaround: Make sure the Kernel is modified to apply the following patch: "xfrm: Fix double ESP trailer insertion in IPsec crypto offload".

Keywords: IPsec, xfrm

Discovered in Release: 5.1-1.0.4.0

2225952

Description: VF mirroring with TC policy skip_sw is not supported on RHEL/CentOS 7.4, 7.5 and 7.6 OSs.

Workaround: N/A

Keywords: ASAP2, Mirroring, RHEL, RedHat, OS

Discovered in Release: 5.1-1.0.4.0

2216521

Description: After upgrading MLNX_EN from v5.0 or earlier, ibdev2netdev utility changes the installation prefix to /usr/sbin. Therefore, it cannot be found while found in the same SHELL environment.

Workaround: After installing MLNX_EN, log out and log in again to refresh the SHELL environment.

Keywords: ibdev2netdev

Discovered in Release: 5.1-1.0.4.0

2202520

Description: Rules with VLAN push/pop, encap/decap and header rewrite actions together are not supported.

Workaround: N/A

Keywords: ASAP2, SwitchDev, VLAN push/pop, encap/decap, header rewrite

Discovered in Release: 5.1-1.0.4.0

2210752

Description: Switching from Legacy mode to SwitchDev mode and vice-versa while TC rules exist on the NIC will result in failure.

Workaround: Before attempting to switch mode, make sure to delete all TC rules on the NIC or stop OpenvSwitch.

Keywords: ASAP2, Devlink, Legacy SR-IOV

Discovered in Release: 5.1-1.0.4.0

2125036/2125031

Description: Upgrading the MLNX_EN from an UPSTREAM_LIBS based version to an MLNX_LIBS based version fails unless the driver is uninstalled and then re-installed.

Workaround: Make sure to uninstall and re-install MLNX_EN to complete the upgrade.

Keywords: Installation, UPSTREAM_LIBS, MLNX_LIBS

Discovered in Release: 5.1-1.0.4.0

2105447

Description: hns_roce warning messages will appear in the dmesg after reboot on Euler2 SP3 OSs.

Workaround: N/A

Keywords: hns_roce, dmesg, Euler

Discovered in Release: 5.1-1.0.4.0

2112251

Description: On kernels 4.10-4.14, when Geneve tunnel's remote endpoint is defined using IPv6, packets larger than MTU are not fragmented, resulting in no traffic sent.

Workaround: Define geneve tunnel's remote endpoint using IPv4.

Keywords: Kernel, Geneve, IPv4, IPv6, MTU, fragmentation

Discovered in Release: 5.1-1.0.4.0

2102902

Description: A kernel panic may occur over RH8.0-4.18.0-80.el8.x86_64 OS when opening kTLS offload connection due to a bug in kernel TLS stack.

Workaround: N/A

Keywords: TLS offload, mlx5e

Discovered in Release: 5.1-1.0.4.0

2111534

Description: A Kernel panic may occur over Ubuntu19.04-5.0.0-38-generic OS when opening kTLS offload connection due to a bug in the Kernel TLS stack.

Workaround: N/A

Keywords: TLS offload, mlx5e

Discovered in Release: 5.1-1.0.4.0

Internal Ref. Number

Issue

2094176

Description: When running in a large scale in VF-LAG mode, bandwidth may be unstable.

Workaround: N/A

Keywords: VF LAG

Discovered in Release: 5.0-1.0.0.0

2044544

Description: When working with OSs with Kernel v4.10, bonding module does not allow setting MTUs larger than 1500 on a bonding interface.

Workaround: Upgrade your Kernel version to v4.11 or above.

Keywords: Bonding, MTU, Kernel

Discovered in Release: 5.0-1.0.0.0

1882932

Description: Libibverbs dependencies are removed during OFED installation, requiring manual installation of libraries that OFED does not reinstall.

Workaround: Manually install missing packages.

Keywords: libibverbs, installation

Discovered in Release: 5.0-1.0.0.0

2058535

Description: ibdev2netdev command returns duplicate devices with different ports in SwitchDev mode.

Workaround: Use /opt/mellanox/iproute2/sbin/rdma link show command instead.

Keywords: ibdev2netdev

Discovered in Release: 5.0-1.0.0.0

2072568

Description: In RHEL/CentOS 7.2 OSs, adding drop rules when act_gact is not loaded may cause a kernel crash.

Workaround: Preload all needed modules to avoid such a scenario (cls_flower, act_mirred, act_gact, act_tunnel_key and act_vlan).

Keywords: RHEL/CentOS 7.2, Kernel 4.9, call trace, ASAP

Discovered in Release: 5.0-1.0.0.0

2093698

Description: VF LAG configuration is not supported when the NUM_OF_VFS configured in mlxconfig is higher than 64.

Workaround: N/A

Keywords: VF LAG, SwitchDev mode, ASAP

Discovered in Release: 5.0-1.0.0.0

2093746

Description: Devlink health dumps are not supported on kernels lower than v5.3.

Workaround: N/A

Keywords: Devlink, health report, dump

Discovered in Release: 5.0-1.0.0.0

2083427

Description: For kernels with connection tracking support, neigh update events are not supported, requiring users to have static ARPs to work with OVS and VxLAN.

Workaround: N/A

Keywords: VxLAN, VF LAG, neigh, ARP

Discovered in Release: 5.0-1.0.0.0

2067012

Description: MLNX_EN cannot be installed on Debian 9.11 OS in SwitchDev mode.

Workaround: Install OFED with the flag --add-kernel-support.

Keywords: ASAP, SwitchDev, Debian, Kernel

Discovered in Release: 5.0-1.0.0.0

2036572

Description: When using a thread domain and the lockless rdma-core ibv_post_send path, there is an additional CPU penalty due to required barriers around the device MMIO buffer that were omitted in MLNX_EN.

Workaround: N/A

Keywords: rdma-core, write-combining, MMIO buffer

Discovered in Release: 5.0-1.0.0.0

Internal Ref. Number

Issue

-

Description: The argparse module is installed by default in Python versions =>2.7 and >=3.2. In case an older Python version is used, the argparse module is not installed by default.

Workaround: Install the argparse module manually.

Keywords: Python, MFT, argparse, installation

Discovered in Release: 4.7-3.2.9.0

1997230

Description: Running mlxfwreset or unloading mlx5_core module while contrak flows are offloaded may cause a call trace in the kernel.

Workaround: Stop OVS service before calling mlxfwreset or unloading mlx5_core module.

Keywords: Contrak, ASAP, OVS, mlxfwrest, unload

Discovered in Release: 4.7-3.2.9.0

1955352

Description: Moving 2 ports to SwitchDev mode in parallel is not supported.

Workaround: N/A

Keywords: ASAP, SwitchDev

Discovered in Release: 4.7-3.2.9.0

1979958

Description: VxLAN IPv6 offload is not supported over CentOS/RHEL v7.2 OSs.

Workaround: N/A

Keywords: Tunnel, VXLAN, ASAP, IPv6

Discovered in Release: 4.7-3.2.9.0

1991710

Description: PRIO_TAG_REQUIRED_EN configuration is not supported and may cause call trace.

Workaround: N/A

Keywords: ASAP, PRIO_TAG, mstconfig

Discovered in Release: 4.7-3.2.9.0

1967866

Description: Enabling ECMP offload requires the VFs to be unbound and VMs to be shut down.

Workaround: N/A

Keywords: ECMP, Multipath, ASAP2

Discovered in Release: 4.7-3.2.9.0

1821235

Description: When using mlx5dv_dr API for flow creation, for flows which execute the "encapsulation" action or "push vlan" action, metadata C registers will be reset to zero.

Workaround: Use the both actions at the end of the flow process.

Keywords: Flow steering

Discovered in Release: 4.7-1.0.0.1

1921981

Description: On Ubuntu, Debian and RedHat 8 and above OSS, parsing the mfa2 file using the mstarchive might result in a segmentation fault.

Workaround: Use mlxarchive to parse the mfa2 file instead.

Keywords: MFT, mfa2, mstarchive, mlxarchive, Ubuntu, Debian, RedHat, operating system

Discovered in Release: 4.7-1.0.0.1

1840288

Description: MLNX_EN does not support XDP features on RedHat 7 OS, despite the declared support by RedHat.

Workaround: N/A

Keywords: XDP, RedHat

Discovered in Release: 4.7-1.0.0.1

1892663

Description: mlnx_tune script does not support python3 interpreter.

Workaround: Run mlnx_tune with python2 interpreter only.

Keywords: mlnx_tune, python3, python2

Discovered in Release: 4.7-1.0.0.1

Internal Ref. Number

Issue

1753629

Description: A bonding bug found in Kernels 4.12 and 4.13 may cause a slave to become permanently stuck in BOND_LINK_FAIL state. As a result, the following message may appear in dmesg:

bond: link status down for interface eth1, disabling it in 100 ms

Workaround: N/A

Keywords: Bonding, slave

Discovered in Release: 4.6-1.0.1.1

1712068

Description: Uninstalling MLNX_EN automatically results in the uninstallation of several libraries that are included in the MLNX_EN package, such as InfiniBand-related libraries.

Workaround: If these libraries are required, reinstall them using the local package manager (yum/dnf).

Keywords: MLNX_EN libraries

Discovered in Release: 4.6-1.0.1.1

-

Description: Due to changes in libraries, MFT v4.11.0 and below are not forward compatible with MLNX_EN v4.6-1.0.0.0 and above.

Therefore, with MLNX_EN v4.6-1.0.0.0 and above, it is recommended to use MFT v4.12.0 and above.

Workaround: N/A

Keywords: MFT compatible

Discovered in Release: 4.6-1.0.1.1

1730840

Description: On ConnectX-4 HCAs, GID index for RoCE v2 is inconsistent when toggling between enabled and disabled interface modes.

Workaround: N/A

Keywords: RoCE v2, GID

Discovered in Release: 4.6-1.0.1.1

1717428

Description: On kernels 4.10-4.14, MTUs larger than 1500 cannot be set for a GRE interface with any driver (IPv4 or IPv6).

Workaround: Upgrade your kernel to any version higher than v4.14.

Keywords: Fedora 27, gretap, ip_gre, ip_tunnel, ip6_gre, ip6_tunnel

Discovered in Release: 4.6-1.0.1.1

1748343

Description: Driver reload takes several minutes when a large number of VFs exists.

Workaround: N/A

Keywords: VF, SR-IOV

Discovered in Release: 4.6-1.0.1.1

1733974

Description: Running heavy traffic (such as 'ping flood') while bringing up and down other mlx5 interfaces may result in “INFO: rcu_preempt dectected stalls on CPUS/tasks:” call traces.

Workaround: N/A

Keywords: mlx5

Discovered in Release: 4.6-1.0.1.1

-

Description: On ConnectX-6 HCAs and above, an attempt to configure advertisement (any bitmap) will result in advertising the whole capabilities.

Workaround: N/A

Keywords: 200GbE, advertisement, Ethtool

Discovered in Release: 4.6-1.0.1.1

Internal Ref. Number

Issue

581631

Description: GID entries referenced to by a certain user application cannot be deleted while that user application is running.

Workaround: N/A

Keywords: RoCE, GID

Discovered in Release: 4.5-1.0.1.0

1403313

Description: Attempting to allocate an excessive number of VFs per PF in operating systems with kernel versions below v4.15 might fail due to a known issue in the Kernel.

Workaround: Make sure to update the Kernel version to v4.15 or above.

Keywords: VF, PF, IOMMU, Kernel, OS

Discovered in Release: 4.5-1.0.1.0

1521877

Description: On SLES 12 SP1 OSs, a kernel tracepoint issue may cause undefined behavior when inserting a kernel module with a wrong parameter.

Workaround: N/A

Keywords: mlx5 driver, SLES 12 SP1

Discovered in Release: 4.5-1.0.1.0

Internal Ref. Number

Issue

504073

Description: When using ConnectX-5 with LRO over PPC systems, the HCA might experience back pressure due to delayed PCI Write operations. In this case, bandwidth might drop from line-rate to ~35Gb/s. Packet loss or pause frames might also be observed.

Workaround: Look for an indication of PCI back pressure (“outbound_pci_stalled_wr” counter in ethtools advancing). Disabling LRO helps reduce the back pressure and its effects.

Keywords: Flow Control, LRO

Discovered in Release: 4.4-1.0.0.0

1424233

Description: On RHEL v7.3, 7.4 and 7.5 OSs, setting IPv4-IP-forwarding will turn off LRO on existing interfaces. Turning LRO back on manually using ethtool and adding a VLAN interface may cause a warning call trace.

Workaround: Make sure IPv4-IP-forwarding and LRO are not turned on at the same time.

Keywords: IPv4 forwarding, LRO

Discovered in Release: 4.4-1.0.1.0

1442507

Description: Retpoline support in GCC causes an increase in CPU utilization, which results in IP forwarding’s 15% performance drop.

Workaround: N/A

Keywords: Retpoline, GCC, CPU, IP forwarding, Spectre attack

Discovered in Release: 4.4-1.0.1.0

1425129

Description: MLNX_EN cannot be installed on SLES 15 OSs using Zypper repository.

Workaround: Install MLNX_EN using the standard installation script instead of Zypper repository.

Keywords: Installation, SLES, Zypper

Discovered in Release: 4.4-1.0.1.0

1241056

Description: When working with ConnectX-4/ConnectX-5 HCAs on PPC systems with Hardware LRO and Adaptive Rx support, bandwidth drops from full wire speed (FWS) to ~60Gb/s.

Workaround: Make sure to disable Adaptive Rx when enabling Hardware LRO: ethtool -C <interface> adaptive-rx off

ethtool -C <interface> rx-usecs 8 rx-frames 128

Keywords: Hardware LRO, Adaptive Rx, PPC

Discovered in Release: 4.3-1.0.1.0

1090612

Description: NVMEoF protocol does not support LBA format with non-zero metadata size. Therefore, NVMe namespace configured to LBA format with metadata size bigger than 0 will cause Enhanced Error Handling (EEH) in PowerPC systems.

Workaround: Configure the NVMe namespace to use LBA format with zero sized metadata.

Keywords: NVMEoF, PowerPC, EEH

Discovered in Release: 4.3-1.0.1.0

1309621

Description: In switchdev mode default configuration, stateless offloads/steering based on inner headers is not supported.

Workaround: To enable stateless offloads/steering based on inner headers, disable encap by running:

devlink dev eswitch show pci/0000:83:00.1 encap disable

Or, in case devlink is not supported by the kernel, run:

echo none > /sys/kernel/debug/mlx5/<BDF>/compat/encap

Note: This is a hardware-related limitation.

Keywords: switchdev, stateless offload, steering

Discovered in Release: 4.3-1.0.1.0

1275082

Description: When setting a non-default IPv6 link local address or an address that is not based on the device MAC, connection establishments over RoCEv2 might fail.

Workaround: N/A

Keywords: IPV6, RoCE, link local address

Discovered in Release: 4.3-1.0.1.0

1307336

Description: In RoCE LAG mode, when running ibdev2netdev -v , the port state of the second port of the mlx4_0 IB device will read “NA” since this IB device does not have a second port.

Workaround: N/A

Keywords: mlx4, RoCE LAG, ibdev2netdev, bonding

Discovered in Release: 4.3-1.0.1.0

1296355

Description: Number of MSI-X that can be allocated for VFs and PFs in total is limited to 2300 on Power9 platforms.

Workaround: N/A

Keywords: MSI-X, VF, PF, PPC, SR-IOV

Discovered in Release: 4.3-1.0.1.0

1259293

Description: On Fedora 20 operating systems, driver load fails with an error message such as: “ [185.262460] kmem_cache_sanity_check (fs_ftes_0000:00:06.0): Cache name already exists.

This is caused by SLUB allocators grouping multiple slab kmem_cache_create into one slab cache alias to save memory and increase cache hotness. This results in the slab name to be considered stale.

Workaround: Upgrade the kernel version to kernel-3.19.8-100.fc20.x86_64.

Note that after rebooting to the new kernel, you will need to rebuild
MLNX_EN against the new kernel version.

Keywords: Fedora, driver load

Discovered in Release: 4.3-1.0.1.0

1264359

Description: When running perftest (ib_send_bw, ib_write_bw, etc.) in rdma-cm mode, the resp_cqe_error counter under /sys/class/infiniband/mlx5_0/ports/1/hw_counters/resp_cqe_error might increase. This behavior is expected and it is a result of receive WQEs that were not consumed.

Workaround: N/A

Keywords: perftest, RDMA CM, mlx5

Discovered in Release: 4.3-1.0.1.0

1264956

Description: Configuring SR-IOV after disabling RoCE LAG using sysfs (/sys/bus/pci/drivers/mlx5_core//roce_lag_enable) might result in RoCE LAG being enabled again in case SR-IOV configuration fails.

Workaround: Make sure to disable RoCE LAG once again.

Keywords: RoCE LAG, SR-IOV

Discovered in Release: 4.3-1.0.1.0

Internal Ref. Number

Issue

1263043

Description: On RHEL7.4, due to an OS issue introduced in kmod package version 20-15.el7_4.6, parsing the depmod configuration files will fail, resulting in either of the following issues:

  • Driver restart failure prompting an error message, such as: “ ERROR: Module mlx5_core belong to kernel which is not a part of MLNX_EN, skipping...

  • nvmet_rdma kernel module dysfunction, despite installing MLNX_EN using the "--with-nvmf " option. An error message, such as: “ nvmet_rdma: unknown parameter 'offload_mem_start' ignored ” will be seen in dmesg output

Workaround: Go to RedHat webpage to upgrade the kmod package version.

Keywords: driver restart, kmod, kmp, nvmf, nvmet_rdma

Discovered in Release: 4.2-1.2.0.0

-

Description: Packet Size (Actual Packet MTU) limitation for IPsec offload on Innova IPsec adapter cards: The current offload implementation does not support IP fragmentation. The original packet size should be such that it does not exceed the interface's MTU size after the ESP transformation (encryption of the original IP packet which increases its length) and the headers (outer IP header) are added:

  • Inner IP packet size <= I/F MTU - ESP additions (20) - outer_IP (20) - fragmentation issue reserved length (56)

  • Inner IP packet size <= I/F MTU - 96

This mostly affects forwarded traffic into smaller MTU, as well as UDP traffic. TCP does PMTU discovery by default and clamps the MSS accordingly.

Workaround: N/A

Keywords: Innova IPsec, MTU

Discovered in Release: 4.2-1.0.1.0

-

Description: No LLC/SNAP support on Innova IPsec adapter cards.

Workaround: N/A

Keywords: Innova IPsec, LLC/SNAP

Discovered in Release: 4.2-1.0.1.0

-

Description: No support for FEC on Innova IPsec adapter cards. When using switches, there may be a need to change its configuration.

Workaround: N/A

Keywords: Innova IPsec, FEC

Discovered in Release: 4.2-1.0.1.0

955929

Description: Heavy traffic may cause SYN flooding when using Innova IPsec adapter cards.

Workaround: N/A

Keywords: Innova IPsec, SYN flooding

Discovered in Release: 4.2-1.0.1.0

-

Description: Priority Based Flow Control is not supported on Innova IPsec adapter cards.

Workaround: N/A

Keywords: Innova IPsec, Priority Based Flow Control

Discovered in Release: 4.2-1.0.1.0

-

Description: Pause configuration is not supported when using Innova IPsec adapter cards. Default pause is global pause (enabled).

Workaround: N/A

Keywords: Innova IPsec, Global pause

Discovered in Release: 4.2-1.0.1.0

1045097

Description: Connecting and disconnecting a cable several times may cause a link up failure when using Innova IPsec adapter cards.

Workaround: N/A

Keywords: Innova IPsec, Cable, link up

Discovered in Release: 4.2-1.0.1.0

-

Description: On Innova IPsec adapter cards, supported MTU is between 512 and 2012 bytes. Setting MTU values outside this range might fail or might cause traffic loss.

Workaround: Set MTU between 512 and 2012 bytes.

Keywords: Innova IPsec, MTU

Discovered in Release: 4.2-1.0.1.0

1125184

Description: In old kernel versions, such as Ubuntu 14.04 and RedHat 7.1, VXLAN interface does not reply to ARP requests for a MAC address that exists in its own ARP table. This issue was fixed in the following newer kernel versions: Ubuntu 16.04 and RedHat 7.3.

Workaround: N/A

Keywords: ARP, VXLAN

Discovered in Release: 4.2-1.0.1.0

1134323

Description: When using kernel versions older than version 4.7 with IOMMU enabled, performance degradations and logical issues (such as soft lockup) might occur upon high load of traffic. This is caused due to the fact that IOMMU IOVA allocations are centralized, requiring many synchronization operations and high locking overhead amongst CPUs.

Workaround: Use kernel v4.7 or above, or a backported kernel that includes the following patches:

  • 2aac630429d9 iommu/vt-d: change intel-iommu to use IOVA frame numbers

  • 9257b4a206fc iommu/iova: introduce per-cpu caching to iova allocation

  • 22e2f9fa63b0 iommu/vt-d: Use per-cpu IOVA caching

Keywords: IOMMU, soft lockup

Discovered in Release: 4.2-1.0.1.0

1135738

Description: On 64k page size setups, DMA memory might run out when trying to increase the ring size/number of channels.

Workaround: Reduce the ring size/number of channels.

Keywords: DMA, 64K page

Discovered in Release: 4.2-1.0.1.0

1159650

Description: When configuring VF VST, VLAN-tagged outgoing packets will be dropped in case of ConnectX-4 HCAs. In case of ConnectX-5 HCAs, VLAN-tagged outgoing packets will have another VLAN tag inserted.

Workaround: N/A

Keywords: VST

Discovered in Release: 4.2-1.0.1.0

1157770

Description: On Passthrough/VM machines with relatively old QEMU and libvirtd,

CMD timeout might occur upon driver load.

After timeout, no other commands will be completed and all driver operations will be stuck.

Workaround: Upgrade the QEMU and libvirtd on the KVM server.

Tested with (Ubuntu 16.10) are the following versions:

  • libvirt 2.1.0

  • QEMU 2.6.1

Keywords: QEMU

Discovered in Release: 4.2-1.0.1.0

1147703

Description: Using dm-multipath for High Availability on top of NVMEoF block devices must be done with “directio” path checker.

Workaround: N/A

Keywords: NVMEoF

Discovered in Release: 4.2-1.0.1.0

1152408

Description: RedHat v7.3 PPCLE and v7.4 PPCLE operating systems do not support KVM qemu out of the box. The following error message will appear when attempting to run virt-install to create new VMs:

Cant find qemu-kvm packge to install

Workaround: Acquire the following rpms from the beta version of 7.4ALT to 7.3/7.4 PPCLE (in the same order):

  • qemu-img-.el7a.ppc64le.rpm
  • qemu-kvm-common-.el7a.ppc64le.rpm

  • qemu-kvm-.el7a.ppc64le.rpm

Keywords: Virtualization, PPC, Power8, KVM, RedHat, PPC64LE

Discovered in Release: 4.2-1.0.1.0

1012719

Description: A soft lockup in the CQ polling flow might occur when running very high stress on the GSI QP (RDMA-CM applications). This is a transient situation from which the driver will later recover.

Workaround: N/A

Keywords: RDMA-CM, GSI QP, CQ

Discovered in Release: 4.2-1.0.1.0

1078630

Description: When working in RoCE LAG over kernel v3.10, a kernel crash might occur when unloading the driver as the Network Manager is running.

Workaround: Stop the Network Manager before unloading the driver and start it back once the driver unload is complete.

Keywords: RoCE LAG, network manager

Discovered in Release: 4.2-1.0.1.0

1149557

Description: When setting VGT+, the maximal number of allowed VLAN IDs presented in the sysfs is 813 (up to the first 813).

Workaround: N/A

Keywords: VGT+

Discovered in Release: 4.2-1.0.1.0

Internal Ref. Number

Issue

995665/1165919

Description: In kernels below v4.13, connection between NVMEoF host and target cannot be established in a hyper-threaded system with more than 1 socket.

Workaround: On the host side, connect to NVMEoF subsystem using --nr-io-queues <num_queues> flag.

Note that num_queues must be lower or equal to num_sockets multiplied with num_cores_per_socket.

Keywords: NVMEoF

1039346

Description: Enabling multiple namespaces per subsystem while using NVMEoF target offload is not supported.

Workaround: To enable more than one namespace, create a subsystem for each one.

Keywords: NVMEoF Target Offload, namespace

1030301

Description: Creating virtual functions on a device that is in LAG mode will destroy the LAG configuration. The boding device over the Ethernet NICs will continue to work as expected.

Workaround: N/A

Keywords: LAG, SR-IOV

1047616

Description: When node GUID of a device is set to zero (0000:0000:0000:0000), RDMA_CM user space application may crash.

Workaround: Set node GUID to a nonzero value.

Keywords: RDMA_CM

1051701

Description: New versions of iproute which support new kernel features may misbehave on old kernels that do not support these new features.

Workaround: N/A

Keywords: iproute

1007830

Description: When working on Xenserver hypervisor with SR-IOV enabled on it, make sure the following instructions are applied:

  1. Right after enabling SR-IOV, unbind all driver instances of the virtual functions from their PCI slots.

  2. It is not allowed to unbind PF driver instance while having active VFs.

Workaround: N/A

Keywords: SR-IOV

1005786

Description: When using ConnectX-5 adapter cards, the following error might be printed to dmesg, indicating temporary lack of DMA pages:

“mlx5_core ... give_pages:289:(pid x): Y pages alloc time exceeded the max permitted duration

mlx5_core ... page_notify_fail:263:(pid x): Page allocation failure notification on func_id(z) sent to fw

mlx5_core ... pages_work_handler:471:(pid x): give fail -12”

Example: This might happen when trying to open more than 64 VFs per port.

Workaround: N/A

Keywords: mlx5_core, DMA

1008066/1009004

Description: Performing some operations on the user end during reboot might cause call trace/panic, due to bugs found in the Linux kernel.

For example: Running get_vf_stats (via iptool) during reboot.

Workaround: N/A

Keywords: mlx5_core, reboot

1009488

Description: Mounting MLNX_EN to a path that contains special characters, such as parenthesis or spaces is not supported. For example, when mounting MLNX_EN to “/media/CDROM(vcd)/”, installation will fail and the following error message will be displayed:

# cd /media/CDROM\(vcd\)/

# ./install

sh: 1: Syntax error: "(" unexpected

Workaround: N/A

Keywords: Installation

982144

Description: When offload traffic sniffer is on, the bandwidth could decrease up to 50%.

Workaround: N/A

Keywords: Offload Traffic Sniffer

981362

Description: On several OSs, setting a number of TC is not supported via the tc tool.

Workaround: Set the number of TC via the /sys/class/net//qos/tc_num sysfs file.

Keywords: Ethernet, TC

979457

Description: When setting IOMMU=ON, a severe performance degradation may occur due to a bug in IOMMU.

Workaround: Make sure the following patches are found in your kernel:

  • iommu/vt-d: Fix PASID table allocation

  • iommu/vt-d: Fix IOMMU lookup for SR-IOV Virtual Functions

Note: These patches are already available in Ubuntu 16.04.02 and 17.04 OSs.

Keywords: Performance, IOMMU

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