RDMA/bnxt_re: Allow bigger MR creation

Allow users to create bigger MRs. Remove the check that prevented creating
MRs with number of pages more than 512.

Link: https://lore.kernel.org/r/1610012608-14528-3-git-send-email-selvin.xavier@broadcom.comSigned-off-by: Devesh Sharma <devesh.sharma@broadcom.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -3829,14 +3829,6 @@ struct ib_mr *bnxt_re_reg_user_mr(struct ib_pd *ib_pd, u64 start, u64 length,
 	}
 	mr->qplib_mr.total_size = length;
 
-	if (page_size == BNXT_RE_PAGE_SIZE_4K &&
-	    length > BNXT_RE_MAX_MR_SIZE_LOW) {
-		ibdev_err(&rdev->ibdev, "Requested MR Sz:%llu Max sup:%llu",
-			  length, (u64)BNXT_RE_MAX_MR_SIZE_LOW);
-		rc = -EINVAL;
-		goto free_umem;
-	}
-
 	umem_pgs = ib_umem_num_dma_blocks(umem, page_size);
 	rc = bnxt_qplib_reg_mr(&rdev->qplib_res, &mr->qplib_mr, umem,
 			       umem_pgs, page_size);

drivers/infiniband/hw/bnxt_re/qplib_sp.c

@@ -658,24 +658,14 @@ int bnxt_qplib_reg_mr(struct bnxt_qplib_res *res, struct bnxt_qplib_mrw *mr,
 	struct creq_register_mr_resp resp;
 	struct cmdq_register_mr req;
 	u16 cmd_flags = 0, level;
-	int pages, rc, pg_ptrs;
+	int pages, rc;
 	u32 pg_size;
 
 	if (num_pbls) {
+		pages = roundup_pow_of_two(num_pbls);
 		/* Allocate memory for the non-leaf pages to store buf ptrs.
 		 * Non-leaf pages always uses system PAGE_SIZE
 		 */
-		pg_ptrs = roundup_pow_of_two(num_pbls);
-		pages = pg_ptrs >> MAX_PBL_LVL_1_PGS_SHIFT;
-		if (!pages)
-			pages++;
-
-		if (pages > MAX_PBL_LVL_1_PGS) {
-			dev_err(&res->pdev->dev,
-				"SP: Reg MR: pages requested (0x%x) exceeded max (0x%x)\n",
-				pages, MAX_PBL_LVL_1_PGS);
-			return -ENOMEM;
-		}
 		/* Free the hwq if it already exist, must be a rereg */
 		if (mr->hwq.max_elements)
 			bnxt_qplib_free_hwq(res, &mr->hwq);