RDMA/bnxt_re: Add disassociate ucontext support

Add driver disassociation support. Driver uses the APIs rdma_user_mmap_io
api while mapping the IO pages to user space.  Add empty stub for
disassociate ucontext.

Link: https://lore.kernel.org/r/1686679943-17117-3-git-send-email-selvin.xavier@broadcom.comSigned-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/bnxt_re/main.c

@@ -472,6 +472,10 @@ static int bnxt_re_net_stats_ctx_alloc(struct bnxt_re_dev *rdev,
 	return rc;
 }
 
+static void bnxt_re_disassociate_ucontext(struct ib_ucontext *ibcontext)
+{
+}
+
 /* Device */
 
 static struct bnxt_re_dev *bnxt_re_from_netdev(struct net_device *netdev)
@@ -538,6 +542,7 @@ static const struct ib_device_ops bnxt_re_dev_ops = {
 	.destroy_qp = bnxt_re_destroy_qp,
 	.destroy_srq = bnxt_re_destroy_srq,
 	.device_group = &bnxt_re_dev_attr_group,
+	.disassociate_ucontext = bnxt_re_disassociate_ucontext,
 	.get_dev_fw_str = bnxt_re_query_fw_str,
 	.get_dma_mr = bnxt_re_get_dma_mr,
 	.get_hw_stats = bnxt_re_ib_get_hw_stats,