mlx4_ib_buf
tun_qp->ring = kzalloc_objs(struct mlx4_ib_buf, nmbr_bufs);
struct mlx4_ib_buf *sqp_proxy_rcv;
struct mlx4_ib_buf buf;
struct mlx4_ib_buf *ring;
kmalloc_objs(struct mlx4_ib_buf, qp->rq.wqe_cnt);