Dell Emulex Family of Adapters - Manual (Page 843)

Emulex Drivers Version 10.2 for Linux User Manual P010081-01A Rev. A
3. Configuration
Ethernet Driver Configuration
843
Edge Virtual Bridging
The OCe14000-series chip supports both VEB and tagless VEPA modes. VEB mode is
enabled by default in the chip. Switching to VEB/VEPA mode can be done using the
Emulex OneConnect TM Manager utility.
Link State Reporting with SR-IOV
When VEB is used for switching traffic between the functions of an SR-IOV enabled
port, the link status reported to the operating system stack when the physical port is not
connected varies with the adapter type. In the older UCNAs (OCe11100 and
LPe16000-series adapters), the VFs continue to indicate the link to be UP even when the
physical port is not linked up. In the newer CNAs (OCe14000-series), by default, the
VFs indicate the link as DOWN when the physical port is not linked up. This changed
behavior in the OCe14000-series adapters enables two or more VFs to be configured in
a bond.
The following table summarizes the default link status of the PFs and VFs in various
adapters when SR-IOV is enabled in BIOS and in the driver.
This default behavior of VFs in OCe14000-series adapters can be changed using the
“ip link” command in distributions of Linux that support iproute version 3.11.0 or later.
For details on configuring the link state for VFs, see “Link State Configuration” on
page 845.
When VEPA is configured to switch traffic between the functions instead of VEB, the
VF link state always reflects the physical state of the associated port and this behavior
cannot be changed.
Configuring VFs
In operating system distributions with newer IP commands that support VF
configuration options, the host administrator can perform the following by using the
“ip link set” command:

Change the default MAC address.

Configure VLAN.

Configure the transmission rate.

Configure the link state.

Set the QoS parameter on VFs.
Table 3-6 Default Link Status of the PFs and VFs
Physical Link is Not Connected
OCe14000 OCe11100 LPe16000
Physical function (PF) Down Down Up
Virtual function (VF) Down Up Up