RDMA/bnxt_re: Fix FRMR issue with single page MR allocation

When the FRMR is allocated with single page, driver is attempting to
create a level 0 HWQ and not allocating any page because the nopte field
is set. This causes the crash during post_send as the pbl is not
populated.

To avoid this crash, check for the nopte bit during HWQ creation with
single page and create a level 1 page table and populate the pbl address
correctly.

Link: https://lore.kernel.org/r/1631709163-2287-9-git-send-email-selvin.xavier@broadcom.com
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/bnxt_re/qplib_res.c

@@ -228,15 +228,16 @@ int bnxt_qplib_alloc_init_hwq(struct bnxt_qplib_hwq *hwq,
 				npages++;
 	}
 
-	if (npages == MAX_PBL_LVL_0_PGS) {
+	if (npages == MAX_PBL_LVL_0_PGS && !hwq_attr->sginfo->nopte) {
 		/* This request is Level 0, map PTE */
 		rc = __alloc_pbl(res, &hwq->pbl[PBL_LVL_0], hwq_attr->sginfo);
 		if (rc)
 			goto fail;
 		hwq->level = PBL_LVL_0;
+		goto done;
 	}
 
-	if (npages > MAX_PBL_LVL_0_PGS) {
+	if (npages >= MAX_PBL_LVL_0_PGS) {
 		if (npages > MAX_PBL_LVL_1_PGS) {
 			u32 flag = (hwq_attr->type == HWQ_TYPE_L2_CMPL) ?
 				    0 : PTU_PTE_VALID;