Manual Pages  — IBV_OPEN_XRCD

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

SYNOPSIS DESCRIPTION RETURN VALUE NOTES SEE ALSO AUTHORS

#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 <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.

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.