RDMA/irdma: Ensure iWarp QP queue memory is OS paged aligned

The SQ is shared for between kernel and used by storing the kernel page
pointer and passing that to a kmap_atomic().

This then requires that the alignment is PAGE_SIZE aligned.

Fix by adding an iWarp specific alignment check.

Fixes: e965ef0 ("RDMA/irdma: Split QP handler into irdma_reg_user_mr_type_qp")
Link: https://lore.kernel.org/r/20231129202143.1434-3-shiraz.saleem@intel.com
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/irdma/verbs.c

@@ -2946,6 +2946,11 @@ static int irdma_reg_user_mr_type_qp(struct irdma_mem_reg_req req,
  int err;
  u8 lvl;
 
+ /* iWarp: Catch page not starting on OS page boundary */
+ if (!rdma_protocol_roce(&iwdev->ibdev, 1) &&
+ ib_umem_offset(iwmr->region))
+ return -EINVAL;
+
  total = req.sq_pages + req.rq_pages + 1;
  if (total > iwmr->page_cnt)
  return -EINVAL;