RDMA/rxe: Remove unused page_offset member

In rxe_map_mr_sg(), the `page_offset` member of the `rxe_mr` struct
was initialized based on `ibmr.iova`, which will be updated inside
ib_sg_to_pages() later.

Consequently, the value assigned to `page_offset` was incorrect. However,
since `page_offset` was never utilized throughout the code, it can be safely
removed to clean up the codebase and avoid future confusion.

Signed-off-by: Li Zhijian <[email protected]>
Link: https://patch.msgid.link/[email protected]
Reviewed-by: Zhu Yanjun <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: zhijianli88

drivers/infiniband/sw/rxe/rxe_mr.c

@@ -237,7 +237,6 @@ int rxe_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sgl,
 	mr->nbuf = 0;
 	mr->page_shift = ilog2(page_size);
 	mr->page_mask = ~((u64)page_size - 1);
-	mr->page_offset = mr->ibmr.iova & (page_size - 1);
 
 	return ib_sg_to_pages(ibmr, sgl, sg_nents, sg_offset, rxe_set_page);
 }

drivers/infiniband/sw/rxe/rxe_odp.c

@@ -110,7 +110,6 @@ int rxe_odp_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length,
 	mr->access = access_flags;
 	mr->ibmr.length = length;
 	mr->ibmr.iova = iova;
-	mr->page_offset = ib_umem_offset(&umem_odp->umem);
 
 	err = rxe_odp_init_pages(mr);
 	if (err) {

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -347,7 +347,6 @@ struct rxe_mr {
 	int			access;
 	atomic_t		num_mw;
 
-	unsigned int		page_offset;
 	unsigned int		page_shift;
 	u64			page_mask;