Users Guide

8–iWARP Configuration

Configuring iWARP on Linux

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The RDMA protocol (p) values are as follows:



0—Accept the default (RoCE)



1—No RDMA



2—RoCE



3—iWARP

For example, to change the interface on the port given by 04:00.0 from

RoCE to iWARP, issue the following command:

# modprobe -v qed rdma_protocol_map=04:00.0-3

3. Load the RDMA driver by issuing the following command:

# modprobe -v qedr

The following example shows the command entries to change the RDMA protocol

to iWARP on multiple NPAR interfaces:

# modprobe qed rdma_protocol_map=04:00.1-3,04:00.3-3,04:00.5-3,

04:00.7-3,04:01.1-3,04:01.3-3,04:01.5-3,04:01.7-3

# modprobe -v qedr

# ibv_devinfo |grep iWARP

transport: iWARP (1)

Detecting the Device

To detect the device:

1. To verify whether RDMA devices are detected, view the

dmesg logs:

# dmesg |grep qedr

[10500.191047] qedr 0000:04:00.0: registered qedr0

[10500.221726] qedr 0000:04:00.1: registered qedr1

2. Issue the ibv_devinfo command, and then verify the transport type.

If the command is successful, each PCI function will show a separate

hca_id. For example (if checking the second port of the above dual-port

adapter):

[root@localhost ~]# ibv_devinfo -d qedr1

hca_id: qedr1