IB_IOCTL_MAGIC    196 include/rdma/ib_user_mad.h #define IB_USER_MAD_REGISTER_AGENT	_IOWR(IB_IOCTL_MAGIC, 1, \
IB_IOCTL_MAGIC    199 include/rdma/ib_user_mad.h #define IB_USER_MAD_UNREGISTER_AGENT	_IOW(IB_IOCTL_MAGIC, 2, __u32)
IB_IOCTL_MAGIC    201 include/rdma/ib_user_mad.h #define IB_USER_MAD_ENABLE_PKEY		_IO(IB_IOCTL_MAGIC, 3)