NAME

       rdma_getaddrinfo - Provides transport independent address translation.

SYNOPSIS

       #include <rdma/rdma_cma.h>

       int  rdma_getaddrinfo  (char  *node,  char  *service,  struct rdma_addrinfo *hints, struct
       rdma_addrinfo **res);

ARGUMENTS

       node        Optional, name, dotted-decimal IPv4, or IPv6 hex address to resolve.

       service     Service name or port number of address.

       hints       Reference to an rdma_addrinfo structure containing hints  about  the  type  of
                   service the caller supports.

       res         A  pointer  to  a  linked list of rdma_addrinfo structures containing response
                   information.

DESCRIPTION

       Resolves the destination node and  service  address  and  returns  information  needed  to
       establish communication.  Provides the RDMA functional equivalent to getaddrinfo.

RETURN VALUE

       Returns  0  on success, or -1 on error.  If an error occurs, errno will be set to indicate
       the failure reason.

NOTES

       Either node, service, or hints must be provided.  If hints  are  provided,  the  operation
       will  be controlled by hints.ai_flags.  If RAI_PASSIVE is specified, the call will resolve
       address information for use on the passive side of a connection.   If  node  is  provided,
       rdma_getaddrinfo  will  attempt to resolve the RDMA address, route, and connection data to
       the given node.  The hints parameter, if provided, may be used to  control  the  resulting
       output as indicated below.  If node is not given, rdma_getaddrinfo will attempt to resolve
       the RDMA addressing information based  on  the  hints.ai_src_addr,  hints.ai_dst_addr,  or
       hints.ai_route.

rdma_addrinfo

       ai_flags    Hint flags that control the operation.  Supported flags are:

       RAI_PASSIVE Indicates  that  the  results  will be used on the passive/listening side of a
                   connection.

       RAI_NUMERICHOST
                   If specified, then the node  parameter,  if  provided,  must  be  a  numerical
                   network address.  This flag suppresses any lengthy address resolution.

       RAI_NOROUTE If set, this flag suppresses any lengthy route resolution.

       ai_family   Address  family  for  the  source and destination address.  Supported families
                   are: AF_INET, AF_INET6, and AF_IB.

       ai_qp_type  Indicates the type of RDMA QP used for communication.   Supported  types  are:
                   IBV_UD (unreliable datagram) and IBV_RC (reliable connected).

       ai_port_space
                   RDMA  port  space in use.  Supported values are: RDMA_PS_UDP, RDMA_PS_TCP, and
                   RDMA_PS_IB.

       ai_src_len  The length of the source address referenced by ai_src_addr.  This will be 0 if
                   an appropriate source address could not be discovered for a given destination.

       ai_dst_len  The length of the destination address referenced by ai_dst_addr.  This will be
                   0 if the RAI_PASSIVE flag was specified as part of the hints.

       ai_src_addr If provided, the address for the local RDMA device.

       ai_dst_addr If provided, the address for the destination RDMA device.

       ai_src_canonname
                   The canonical for the source.

       ai_dst_canonname
                   The canonical for the destination.

       ai_route_len
                   Size of the routing information buffer referenced by ai_route.  This will be 0
                   if  the  underlying  transport does not require routing data, or none could be
                   resolved.

       ai_route    Routing information for RDMA transports that require routing data as  part  of
                   connection  establishment.   The  format  of  the  routing data depends on the
                   underlying transport.   If  Infiniband  transports  are  used,  ai_route  will
                   reference  an  array  of  struct  ibv_path_data  on output, if routing data is
                   available.  Routing paths may be restricted by setting  desired  routing  data
                   fields  on  input  to  rdma_getaddrinfo.   For  Infiniband, hints.ai_route may
                   reference an array of struct ibv_path_record or struct ibv_path_data on input.

       ai_connect_len
                   Size of connection information referenced by ai_connect.  This will  be  0  if
                   the underlying transport does not require additional connection information.

       ai_connect  Data  exchanged as part of the connection establishment process.  If provided,
                   ai_connect data must be transferred as private data, with  any  user  supplied
                   private data following it.

       ai_next     Pointer  to  the next rdma_addrinfo structure in the list.  Will be NULL if no
                   more structures exist.

SEE ALSO

       rdma_create_id(3),     rdma_resolve_route(3),     rdma_connect(3),      rdma_create_qp(3),
       rdma_bind_addr(3), rdma_create_ep(3)