Subject: Re: [PATCH v4 for-next 04/12] IB/ipoib: Return IPoIB devices matching connection parameters

From: Haggai Eran <haggaie-VPRAkNaXOzVWk0Htik3J/[email-masked]>
Date: Thu, 21 May 2015 08:33:53 +0300

On 20/05/2015 02:55, Jason Gunthorpe wrote:
> On Sun, May 17, 2015 at 08:51:00AM +0300, Haggai Eran wrote:
>> > From: Guy Shapiro <guysh-VPRAkNaXOzVWk0Htik3J/[email-masked]>
>> > 
>> > Implement the get_net_device_by_port_pkey_ip callback that returns network
>> > device to ib_core according to connection parameters. Check the ipoib
>> > device and iterate over all child devices to look for a match.
> Can you give a run down on how to actually set this up? Like what
> shell command do you execute?

Sure.

There are two methods to create new child interface for IPoIB.
For a specific P_Key, write the desired P_Key to the create_child sysfs
file:
# echo 0x8000 > /sys/class/net/ib0/create_child
This creates a new interface ib0.8000 operating with P_Key 0x8000.

To create a new child interface on the default P_Key, its possible to
use iproute:
# ip link add link ib0 name ib0.1 type ipoib

In order to create a new network namespace:
# ip netns add ns1

Then, you can assign the new netdev to the namespace:
# ip link set ib0.1 netns ns1

You can then set an IP address in the network namespace, and try some
RDMA CM applications:
# ip netns exec ns1 ip addr add dev ib0.1 192.168.0.1/24
# ip netns exec ns1 rdma_server

Regards,
Haggai
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