User Manual

Features Overview and ConfigurationRev 2.3-1.0.1
Mellanox Technologies
148
3.2.5.3.4.4 Driver Configuration
For PV-EoIB to work properly, the following features must be disabled in the driver:
• Large Receive Offload (LRO)
• TX completion polling
• RX fragmented buffers
To disable the features above, edit the modprobe configuration file as follow:
options mlx4_vnic lro_num=0 tx_polling=0 rx_linear=1
For the full list of mlx4_vnic module parameters, run:
# modinfo mlx4_vnic
3.2.5.3.4.5 Network Configuration
PV-EoIB supports both L2 (bridged) and L3 (routed) network models. The 'physical' interfaces
that can be enslaved to the Hypervisor virtual bridge are actually EoIB vNics, and they can be
created as on an native Linux machine. PV-EoIB driver supports both host-administrated and net-
work-administrated vNics. Please refer to Section 3.2.5.3.2, “EoIB Configuration”, on page 137
for more information on vNics configuration.
Once an EoIB vNic is enslaved to a virtual bridge, it can be used by any Guest OS that is sup-
ported by the Hypervisor. The driver will automatically manage the resources required to serve
the Guest OS network virtual interfaces (based on their MAC address).
To see the list of MAC addresses served by an EoIB vNic, log into the Hypervisor and run the
command:
# mlx4_vnic_info -m <interface>
The driver detects virtual interfaces MAC addresses based in their outgoing packets, so
you may notice that the virtual MAC address is being detected by the EoIB driver only
after the first packet is sent out by the Guest OS. Virtual resources MAC addresses
cleanup is managed by mlx4_vnic daemon as explained in Section 3.2.5.3.4.9,
“Resources Cleanup”, on page 149
.
3.2.5.3.4.6 Multicast Configuration
Virtual machines multicast traffic over PV-EoIB is supported in promiscuous mode. Hence, all
multicast traffic is sent over the broadcast domain, and filtered in the VM level.
• To enable promiscuous multicast, log into the BridgeX CLI and run the command:
# bxm eoib mcast promiscuous
Please refer to BridgeX CLI Guide for additional details.
• To see the multicast configuration of a vNic from the host, log into the Hypervisor and
run:
# mlx4_vnic_info -i <interface> | grep MCAST
3.2.5.3.4.7 VLANs
Virtual LANs are supported in EoIB vNic level, where VLAN tagging/untagging is done by the
EoIB driver.
• To enable VLANs on top of a EoIB vNic:
a. Create a new vNic interface with the corresponding VLAN ID