NAME

       rdma_set_option - Set communication options for an rdma_cm_id.

SYNOPSIS

       #include <rdma/rdma_cma.h>

       int  rdma_set_option  (struct rdma_cm_id *id, int level, int optname, void *optval, size_t
       optlen);

ARGUMENTS

       id          RDMA identifier.

       level       Protocol level of the option to set.

       optname     Name of the option, relative to the level, to set.

       optval      Reference to the option data.  The data is dependent on the level and optname.

       optlen      The size of the %optval buffer.

DESCRIPTION

       Sets communication options for an rdma_cm_id.  This call is used to override  the  default
       system settings.

       optname can be one of

       RDMA_OPTION_ID_TOS
                   Specify  the quality of service provided by a connection.  The expected optlen
                   is size of uint8_t.

       RDMA_OPTION_ID_REUSEADDR
                   Bound the rdma_cm_id to a reuseable address. This will allow  other  users  to
                   bind to that same address.  The expected optlen is size of int.

       RDMA_OPTION_ID_AFONLY
                   Set IPV6_V6ONLY socket.  The expected optlen is size of int.

       RDMA_OPTION_IB_PATH
                   Set   IB   path   record   data.   The  expected  optlen  is  size  of  struct
                   ibv_path_data[].

       RDMA_OPTION_ID_ACK_TIMEOUT
                   Set QP ACK timeout.  The value calculated according to  the  formula  4.096  *
                   2^(ack_timeout) usec.

RETURN VALUE

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

NOTES

       Option details may be found in the relevant header files.

SEE ALSO

       rdma_create_id(3)