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ibsrpdm.md

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Using ibsrpdm

ibsrpdm is used for discovering and connecting to SRP SCSI targets on InfiniBand fabrics. These targets can be accessed with the InfiniBand SRP initiator module, "ib_srp," included in Linux kernels 2.6.15 and newer.

To run ibsrpdm, the ib_umad module must be loaded, as well as an appropriate low-level driver for the installed IB hardware.

With no command line parameters, ibsrpdm displays information about SRP targets in human-readable form:

# ibsrpdm
IO Unit Info:
    port LID:        0009
    port GID:        fe800000000000000005ad00000013e9
    change ID:       73b0
    max controllers: 0x01

    controller[  1]
        GUID:      0005ad00000013e7
        vendor ID: 0005ad
        device ID: 0005ad
        IO class : 0100
        ID:        Topspin SRP/FC TCA
        service entries: 2
            service[  0]: 0000000000000066 / SRP.T10:20030003BA27CC7A
            service[  1]: 0000000000000066 / SRP.T10:20030003BA27CF53

With the "-c" flag, ibsrpdm displays information in a form that can be written to the kernel SRP initiators add_target file to connect to the SRP targets. For example:

# ibsrpdm -c
id_ext=20030003BA27CC7A,ioc_guid=0005ad00000013e7,dgid=fe800000000000000005ad00000013e9,pkey=ffff,service_id=0000000000000066
id_ext=20030003BA27CF53,ioc_guid=0005ad00000013e7,dgid=fe800000000000000005ad00000013e9,pkey=ffff,service_id=0000000000000066

Given this, the command below will connect to the first target discovered from the first port of the local HCA device "mthca0":

# echo -n id_ext=20030003BA27CC7A,ioc_guid=0005ad00000013e7,dgid=fe800000000000000005ad00000013e9,pkey=ffff,service_id=0000000000000066 > /sys/class/infiniband_srp/srp-mthca0-1/add_target