User Manual

Driver FeaturesRev 2.2-1.0.1

Mellanox Technologies

• The subnet mask that you want to assign to the interface

The following example shows how to configure an IB interface:

host1$ ifconfig ib0 11.4.3.175 netmask 255.255.0.0

Step 2. (Optional) Verify the configuration by entering the ifconfig command with the appropriate

interface identifier ib# argument.

The following example shows how to verify the configuration:

host1$ ifconfig ib0

b0 Link encap:UNSPEC HWaddr 80-00-04-04-FE-80-00-00-00-00-00-00-00-00-00-00

inet addr:11.4.3.175 Bcast:11.4.255.255 Mask:255.255.0.0

UP BROADCAST MULTICAST MTU:65520 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:128

RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Step 3. Repeat Step 1 and Step 2 on the remaining interface(s).

4.4.4 Subinterfaces

You can create subinterfaces for a primary IPoIB interface to provide traffic isolation. Each such

subinterface (also called a child interface) has a different IP and network addresses from the pri-

mary (parent) interface. The default Partition Key (PKey), ff:ff, applies to the primary (parent)

interface.

This section describes how to

• Create a subinterface (Section 4.4.4.1)

• Remove a subinterface (Section 4.4.4.2)

4.4.4.1 Creating a Subinterface

In the following procedure, ib0 is used as an example of an IB subinterface.

To create a child interface (subinterface), follow this procedure:

Step 1. Decide on the PKey to be used in the subnet (valid values can be 0 or any 16-bit unsigned

value). The actual PKey used is a 16-bit number with the most significant bit set. For exam-

ple, a value of 1 will give a PKey with the value 0x8001.

Step 2. Create a child interface by running:

host1$ echo <PKey> > /sys/class/net/<IB subinterface>/create_child

Example:

host1$ echo 1 > /sys/class/net/ib0/create_child

This will create the interface ib0.8001.

Step 3. Verify the configuration of this interface by running:

host1$ ifconfig <subinterface>.<subinterface PKey>