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Chapter 7. Configuring Soft-iWARP

Remote Direct Memory Access (RDMA) uses several libraries and protocols over an Ethernet such as iWARP, Soft-iWARP for performance improvement and aided programming interface.

Important

Soft-iWARP is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

7.1. Overview of iWARP and Soft-iWARP
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Remote direct memory access (RDMA) uses the iWARP over Ethernet for converged and low latency data transmission over TCP. By using standard Ethernet switches and the TCP/IP stack, iWARP routes traffic across the IP subnets to utilize the existing infrastructure efficiently. In Red Hat Enterprise Linux, multiple providers implement iWARP for their hardware network interface cards. For example, cxgb4, irdma, qedr, and so on.

Soft-iWARP (siw) is a software-based iWARP kernel driver and user library for Linux. It is a software-based RDMA device that provides a programming interface to RDMA hardware when attached to network interface cards. It provides an easy way to test and validate the RDMA environment.

7.2. Configuring Soft-iWARP
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Soft-iWARP (siw) implements the iWARP Remote direct memory access (RDMA) transport over the Linux TCP/IP network stack. It enables a system with a standard Ethernet adapter to interoperate with an iWARP adapter or with another system running the Soft-iWARP driver or a host with the hardware that supports iWARP.

Important

The Soft-iWARP feature is provided as a Technology Preview only. Technology Preview features are not supported with Red Hat production Service Level Agreements (SLAs), might not be functionally complete, and Red Hat does not recommend using them for production. These previews provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process.

See Technology Preview Features Support Scope on the Red Hat Customer Portal for information about the support scope for Technology Preview features.

To configure Soft-iWARP, you can use this procedure in a script to run automatically when the system boots.

Prerequisites

  • An Ethernet adapter is installed

Procedure

  1. Install the iproute, libibverbs, libibverbs-utils, and infiniband-diags packages: 

    # yum install iproute libibverbs libibverbs-utils infiniband-diags
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  2. Display the RDMA links: 

    # rdma link show
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  3. Load the siw kernel module: 

    # modprobe siw
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  4. Add a new siw device named siw0 that uses the enp0s1 interface: 

    # rdma link add siw0 type siw netdev enp0s1
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Verification

  1. View the state of all RDMA links: 

    # rdma link show

link siw0/1 state ACTIVE physical_state LINK_UP netdev enp0s1
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  2. List the available RDMA devices: 

    # ibv_devices

 device                 node GUID
 ------              ----------------
 siw0                0250b6fffea19d61
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  3. You can use the ibv_devinfo utility to display a detailed status: 

    # ibv_devinfo siw0

    hca_id:               siw0
    transport:            iWARP (1)
    fw_ver:               0.0.0
    node_guid:            0250:b6ff:fea1:9d61
    sys_image_guid:       0250:b6ff:fea1:9d61
    vendor_id:            0x626d74
    vendor_part_id:       1
    hw_ver:               0x0
    phys_port_cnt:          1
        port:               1
            state:          PORT_ACTIVE (4)
            max_mtu:        1024 (3)
            active_mtu:     1024 (3)
            sm_lid:         0
            port_lid:       0
            port_lmc:       0x00
            link_layer:     Ethernet
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