/usr/bin/ibv_ud_pingpong: unrecognized option '--help'
Usage:
  /usr/bin/ibv_ud_pingpong            start a server and wait for connection
  /usr/bin/ibv_ud_pingpong <host>     connect to server at <host>

Options:
  -p, --port=<port>      listen on/connect to port <port> (default 18515)
  -d, --ib-dev=<dev>     use IB device <dev> (default first device found)
  -i, --ib-port=<port>   use port <port> of IB device (default 1)
  -s, --size=<size>      size of message to exchange (default 2048)
  -r, --rx-depth=<dep>   number of receives to post at a time (default 500)
  -n, --iters=<iters>    number of exchanges (default 1000)
  -l, --sl=<SL>          send messages with service level <SL> (default 0)
  -e, --events           sleep on CQ events (default poll)
  -g, --gid-idx=<gid index> local port gid index
  -c, --chk              validate received buffer