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       ibportstate  -  handle  port  (physical)  state  and  link  speed of an
       InfiniBand port


       ibportstate [-d(ebug)] [-e(rr_show)] [-v(erbose)] [-D(irect)] [-G(uid)]
       [-s   smlid]   [-V(ersion)]   [-C  ca_name]  [-P  ca_port]  [-t(imeout)
       timeout_ms] [-h(elp)] <dest dr_path|lid|guid> <portnum> [<op>]


       ibportstate allows the port state and port physical state of an IB port
       to  be  queried  (in  addition  to link width and speed being validated
       relative to the peer port when the port queried is a switch port), or a
       switch  port to be disabled, enabled, or reset. It also allows the link
       speed enabled on any IB port to be adjusted.


       op     Port operations allowed
               supported ops: enable, disable, reset, speed, query
               Default is query

        ops enable, disable, and reset are only allowed on switch ports
        (An error is indicated if attempted on CA or router ports)
        speed op is allowed on any port
        speed values are legal values for PortInfo:LinkSpeedEnabled
        (An error is indicated if PortInfo:LinkSpeedSupported does not support
         this setting)
        (NOTE: Speed changes are not effected until the port goes through
         link renegotiation)
        query also validates port characteristics (link width and speed)
         based on the peer port. This checking is done when the port
         queried is a switch port as it relies on combined routing
         (an initial LID route with directed routing to the peer) which
         can only be done on a switch. This peer port validation feature
         of query op requires LID routing to be functioning in the subnet.


       Most OpenIB diagnostics take the following common flags. The exact list
       of supported flags per utility can be found in the  usage  message  and
       can be shown using the util_name -h syntax.

       # Debugging flags

       -d      raise the IB debugging level.
               May be used several times (-ddd or -d -d -d).

       -e      show send and receive errors (timeouts and others)

       -h      show the usage message

       -v      increase the application verbosity level.
               May be used several times (-vv or -v -v -v)

       -V      show the version info.

       # Addressing flags

       -D      use directed path address arguments. The path
               is a comma separated list of out ports.
               "0"             # self port
               "0,1,2,1,4"     # out via port 1, then 2, ...

       -G       use GUID address argument. In most cases, it is the Port GUID.

       -s <smlid>      use ’smlid’ as the target lid for SM/SA queries.

       # Other common flags:

       -C <ca_name>    use the specified ca_name.

       -P <ca_port>    use the specified ca_port.

       -t <timeout_ms> override the default timeout for the solicited mads.

       Multiple CA/Multiple Port Support

       When no IB device or port is specified, the port to use is selected  by
       the following criteria:

       1. the first port that is ACTIVE.

       2. if not found, the first port that is UP (physical link up).

       If a port and/or CA name is specified, the user request is attempted to
       be fulfilled, and will fail if it is not possible.


       ibportstate 3 1 disable                 # by lid

       ibportstate -G 0x2C9000100D051 1 enable # by guid

       ibportstate -D 0 1                      # (query) by direct route

       ibportstate 3 1 reset                   # by lid

       ibportstate 3 1 speed 1                 # by lid


       Hal Rosenstock