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       ibv_open_xrcd,  ibv_close_xrcd - open or close an XRC protection domain


       #include <infiniband/verbs.h>

       struct ibv_xrcd *ibv_open_xrcd(struct ibv_context *context,
                                      struct ibv_xrcd_init_attr *xrcd_init_attr);

       int ibv_close_xrcd(struct ibv_xrcd *xrcd);


       ibv_open_xrcd() open an XRC domain for the RDMA device context  context
       xrcd_init_attr   is   an   ibv_xrcd_init_attr  struct,  as  defined  in

       struct ibv_xrcd_init_attr {
               uint32_t         comp_mask;  /* Identifies valid fields */
               int              fd;
               int              oflag;

       fd is the file descriptor to associate with the XRCD.  oflag  describes
       the desired creation attributes.  It is a bitwise OR of zero or more of
       the following flags:

              Indicates that an XRCD should be created and associated with the
              inode referenced by the given fd.  If the XRCD exists, this flag
              has no effect except as noted under O_EXCL below.

       O_EXCL If O_EXCL and O_CREAT  are  set,  open  will  fail  if  an  XRCD
              associated with the inode exists.

       If fd equals -1, no inode is associated with the XRCD. To indicate that
       XRCD should be created, use oflag = O_CREAT.

       ibv_close_xrcd() closes the XRCD xrcd.  If this is the last  reference,
       the XRCD will be destroyed.


       ibv_open_xrcd()  returns  a  pointer to the opened XRCD, or NULL if the
       request fails.

       ibv_close_xrcd() returns 0 on success, or the value of errno on failure
       (which indicates the failure reason).


       ibv_close_xrcd()  may  fail  if  any other resource is still associated
       with the XRCD being closed.


       ibv_create_srq_ex(3), ibv_create_qp_ex(3),


       Sean Hefty <>

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