NAME

       mckey - RDMA CM multicast setup and simple data transfer test.

SYNOPSIS

       mckey -m multicast_address [-s] [-b bind_address] [-c connections]
                 [-C message_count] [-S message_size] [-p port_space]
       mckey -m multicast_address -s [-b bind_address] [-c connections]
                 [-C message_count] [-S message_size] [-p port_space]
       mckey -M unmapped_multicast_address -b bind_address [-s] [-c connections]
                 [-C message_count] [-S message_size] [-p port_space]

DESCRIPTION

       Establishes a set of RDMA multicast communication paths between nodes using the librdmacm,
       optionally transfers datagrams to receiving nodes, then tears down the communication.

OPTIONS

       -m multicast_address
              IP multicast address to join.

       -M unmapped_multicast_address
              RDMA transport specific multicast address to join.

       -s     Send datagrams to the multicast group.

       -b bind_address
              The local network address to bind to.

       -c connections
              The number of QPs to join the multicast group.  (default 1)

       -C message_count
              The number of messages to transfer over each connection.  (default 10)

       -S message_size
              The size of each message transferred, in bytes.  This value must  be  smaller  than
              the MTU of the underlying RDMA transport, or an error will occur.  (default 100)

       -p port_space
              The  port space of the datagram communication.  May be either the RDMA UDP (0x0111)
              or IPoIB (0x0002) port space.  (default RDMA_PS_UDP)

NOTES

       Basic usage is to start mckey -m multicast_address on a server system, then run  mckey  -m
       multicast_address -s on a client system.

       Unique Infiniband SA assigned multicast GIDs can be retrived by invoking mckey with a zero
       MGID or IP address.  (Example, -M  0  or  -m  0.0.0.0).   The  assigned  address  will  be
       displayed to allow mckey clients to join the created group.

       Because  this  test  maps  RDMA  resources  to userspace, users must ensure that they have
       available system resources and permissions.  See the libibverbs README file for additional
       details.

SEE ALSO

       rdma_cm(7), ucmatose(1), udaddy(1), rping(1)