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Bug
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Resolution: Unresolved
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Normal
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None
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rhel-8.8.0
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None
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Important
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rhel-sst-virtualization-cloud
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ssg_virtualization
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5
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QE ack
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False
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None
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None
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None
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None
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If docs needed, set a value
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x86_64
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None
Description of problem:
Accelerated Network in Azure produces hv_netvsc adapter and mlx VF adapter with the same MAC address. The azure cloud-init produces ifcfg for the hv_netvsc with HWADDR. When systemd-udev runs it generates a rename error trying to name the mlx device the same name as assigned to the hv_netvsc device.
The goal of this bug is to find out what is needed to make system-udevd accomodate the accelerated networking in Azure where hv_netvsc and mlx interfaces have the same MAC address. So far I can not see a solution that would stop systemd-udev from trying to name the mlx adapter based on what is in ifcfg-* with it's HWADDR even when there are MATCH's to exclude the mlx adapter.
Version-Release number of selected component (if applicable):
RHEL8.8
How reproducible:
Create azure VM with accelerated network adapter and reboot after the install,then find errors like:
Jul 17 21:55:21 novo-rhel8-new systemd-udevd[623]: Error changing net interface name 'eth0' to 'net0': File exists
Steps to Reproduce:
Make Azure VM with:
"imageReference":
{ "communityGalleryImageId": null, "exactVersion": "8.7.2023022801", "id": null, "offer": "RHEL", "publisher": "RedHat", "sharedGalleryImageId": null, "sku": "87-gen2", "version": "latest" },
VM using Standard_D2s_v3
$ az network nic show -g (username's-rg) --name rhel8-test779 --query "enableAcceleratedNetworking"
true
Deploy then reboot after the deployment so that the system boots with the ifcfg-eth0 added by cloud-init.
Actual results:
RHEL VM should have
- accelerated networking
- name hv_netvsc device eth0
- name the mlx device enP*
- not assign an ip address to the mlx device
- properly linked the mlx and hv_netvsc (master eth0 for enP* device)
e.g.
- ip a
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 60:45:bd:eb:12:ad brd ff:ff:ff:ff:ff:ff
inet 10.0.0.4/24 brd 10.0.0.255 scope global noprefixroute eth0
valid_lft forever preferred_lft forever
inet6 fe80::6245:bdff:feeb:12ad/64 scope link
valid_lft forever preferred_lft forever
3: enP28653s1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master eth0 state UP group default qlen 1000
link/ether 60:45:bd:eb:12:ad brd ff:ff:ff:ff:ff:ff
altname enP28653p0s2
- ethtool -i eth0 |head -2
driver: hv_netvsc
version: 4.18.0-425.13.1.el8_7.x86_64
After the reboot, /var/log/messages contains:
Jul 15 15:04:04 test systemd-udevd[823]: Error changing net interface name 'enP65246s1' to 'eth0': File exists
Jul 15 15:04:04 test systemd-udevd[823]: could not rename interface '3' from 'enP65246s1' to 'eth0': File exists
WHAT CAN BE ADDED TO CONFIGURATION TO STOP system-udev FROM TRYING TO NAME THE mlx ADAPTER BASED ON HWADDR IN /etc/sysconfig/network-scripts/ifcfg-*?
Expected results:
No error.
Additional info:
I also tried adding the following to ifcfg while changing from using eth0 name for the hv_netvsc device:
MATCH_PATH='!-pci'
MATCH_DRIVER="hv_netvsc"
Here is how I did that since the Azure instance's cloud-init overwrites any changes to ifcfg-eth0:
After cloud-init was run to put it's ifcfg-eth0 in place, I did:
rpm -e cloud-init
dracut -f -o "network network-manager ifcfg"
renamed eth0 to net0, to avoid conflicts clouded by the site of eth* naming.
added the MATCH_PATH and MATCH_DRIVER options to ifcfg-net0.
systemd-udev still produces rename error.
Jul 17 21:55:21 rhel8-new systemd-udevd[623]: PROGRAM '/lib/udev/rename_device' /usr/lib/udev/rules.d/60-net.rules:1 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: '/lib/udev/rename_device'(out) 'net0' Jul 17 21:55:21 rhel8-new systemd-udevd[623]: Process '/lib/udev/rename_device' succeeded. Jul 17 21:55:21 rhel8-new systemd-udevd[623]: NAME 'net0' /usr/lib/udev/rules.d/60-net.rules:1 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: IMPORT builtin 'net_id' /usr/lib/udev/rules.d/75-net-description.rules:6 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: Using default interface naming scheme 'rhel-8.0'. Jul 17 21:55:21 rhel8-new systemd-udevd[623]: IMPORT builtin 'hwdb' /usr/lib/udev/rules.d/75-net-description.rules:12 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: IMPORT builtin 'path_id' /usr/lib/udev/rules.d/80-net-setup-link.rules:5 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: IMPORT builtin 'net_setup_link' /usr/lib/udev/rules.d/80-net-setup-link.rules:9 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: Config file /usr/lib/systemd/network/99-default.link applies to device eth0 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable. Jul 17 21:55:21 rhel8-new systemd-udevd[623]: RUN '/usr/lib/systemd/systemd-sysctl --prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$name --prefix=/net/ipv6/conf/$name --prefix=/net/ipv6/neigh/$name' /usr/lib/udev/rules.d/99-systemd.rules:60 Jul 17 21:55:21 rhel8-new systemd-udevd[623]: Error changing net interface name 'eth0' to 'net0': File exists Jul 17 21:55:21 rhel8-new systemd-udevd[623]: could not rename interface '3' from 'eth0' to 'net0': File exists Jul 17 21:55:21 rhel8-new systemd-udevd[623]: Process '/usr/lib/systemd/systemd-sysctl --prefix=/net/ipv4/conf/net0 --prefix=/net/ipv4/neigh/net0 --prefix=/net/ipv6/conf/net0 --prefix=/net/ipv6/neigh/net0' succeeded.
$ cat /etc/sysconfig/network-scripts/ifcfg-net0 BOOTPROTO=dhcp DEVICE=net0 HWADDR=00:0d:3a:9b:bb:95 ONBOOT=yes TYPE=Ethernet USERCTL=no MATCH_PATH='!-pci' MATCH_DRIVER="hv_netvsc" $ nmcli con show NAME UUID TYPE DEVICE System net0 33e2dfe5-649b-21d9-4fc5-2feaad011ccc ethernet net0 $ nmcli con show 33e2dfe5-649b-21d9-4fc5-2feaad011ccc | grep match match.interface-name: – match.kernel-command-line: – match.driver: hv_netvsc match.path: !-pci $ ip a show 2: net0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether 00:0d:3a:9b:bb:95 brd ff:ff:ff:ff:ff:ff inet 10.0.0.5/24 brd 10.0.0.255 scope global noprefixroute net0 valid_lft forever preferred_lft forever inet6 fe80::20d:3aff:fe9b:bb95/64 scope link valid_lft forever preferred_lft forever 3: eth0: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master net0 state UP group default qlen 1000 link/ether 00:0d:3a:9b:bb:95 brd ff:ff:ff:ff:ff:ff altname enP29499p0s2 $ ethtool -i net0 | grep driver driver: hv_netvsc $ ethtool -i eth0 | grep driver driver: mlx5_core $ sudo udevadm info --export-db | grep -i -e driver -e "DEVPATH.*eth0" -e "DEVPATH.*net0" -e "ID_PATH" | grep -A 2 DEVPATH calling: info E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:00/VMBUS:00/000d3a9b-bb95-000d-3a9b-bb95000d3a9b/net/net0 E: ID_NET_DRIVER=hv_netvsc E: ID_PATH=acpi-VMBUS:00 – E: DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/ACPI0004:00/VMBUS:00/7cb93933-733b-443c-932a-9473684376c8/pci733b:00/733b:00:02.0/net/eth0 E: ID_NET_DRIVER=mlx5_core E: ID_PATH=acpi-VMBUS:00-pci-733b:00:02.0
