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NAME

       ibv_open_xrcd,  ibv_close_xrcd - open or close an XRC protection domain
       (XRCDs)

SYNOPSIS

       #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);

DESCRIPTION

       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
       <infiniband/verbs.h>.

       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:

       O_CREAT
              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.

RETURN VALUE

       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).

NOTES

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

SEE ALSO

       ibv_create_srq_ex(3), ibv_create_qp_ex(3),

AUTHORS

       Sean Hefty <sean.hefty@intel.com>



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