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

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

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

       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 retrieved 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.

       -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)

       -o     Join  the  multicast  group  as  a send-only full-member. Otherwise the group is joined as a full-
              member.

       -l     Prevent multicast message loopback. Other receivers on the  local  system  will  not  receive  the
              multicast  messages.  Otherwise  all  multicast messages are also send to the host they originated
              from and local listeners (and probably the sending process itself) will receive the messages.   -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)

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

librdmacm                                          2007-05-15                                           MCKEY(1)

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]