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Do not set MTU for InfiniBand slaves

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Slaves should have no MTU set. This should be set globally on the bond interface.
Furthermore, RHEL 8.0 does not correctly set the given MTU as shown below.
This breaks any IB bonds with non-default (2044) MTU.

$ # IB slave with 4092 MTU
$ nmcli con add type Infiniband con-name slave-ib1-mtu mtu 4092 ifname ib1 master ibbond0 slave-type bond
$ # IB slave without MTU
$ nmcli con add type Infiniband con-name slave-ib1-wo-mtu ifname ib1 master ibbond0 slave-type bond

$ # should be 4092, but is 2044 instead
$ nmcli -f infiniband.mtu con show slave-ib1-mtu
infiniband.mtu:                         2044

$ grep MTU /etc/sysconfig/network-scripts/ifcfg-slave-ib1-*
/etc/sysconfig/network-scripts/ifcfg-slave-ib1-mtu:MTU=2044

$ # is auto :)
$ nmcli -f infiniband.mtu con show slave-ib1-wo-mtu
infiniband.mtu:                         auto
This commit is contained in:
Markus Hilger
2020-05-12 13:41:45 +02:00
parent 097bf969d4
commit a274097b34
1 changed files with 4 additions and 0 deletions
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4
xCAT/postscripts/nicutils.sh
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@@ -2246,6 +2246,10 @@ function create_bond_interface_nmcli {
$ip link set dev $ifslave down
wait_for_ifstate $ifslave DOWN 20 2
fi
# InfiniBand slaves should have no MTU defined, only the bond interface
if [ "$slave_type" = "Infiniband" ]; then
_mtu=""
fi
cmd="$nmcli con add type $slave_type con-name $xcat_slave_con $_mtu ifname $ifslave master $xcat_con_name slave-type bond autoconnect yes connection.autoconnect-priority 9 connection.autoconnect-retries 0"
log_info $cmd
$cmd