static int create_user_mr()

in mlx5/core/mr.c [359:420]

• 51 lines of code
• 9 McCabe index (conditional complexity)

static int create_user_mr(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *iotlb)
{
	struct mlx5_vdpa_mr *mr = &mvdev->mr;
	struct mlx5_vdpa_direct_mr *dmr;
	struct mlx5_vdpa_direct_mr *n;
	struct vhost_iotlb_map *map;
	u32 pperm = U16_MAX;
	u64 last = U64_MAX;
	u64 ps = U64_MAX;
	u64 pe = U64_MAX;
	u64 start = 0;
	int err = 0;
	int nnuls;

	INIT_LIST_HEAD(&mr->head);
	for (map = vhost_iotlb_itree_first(iotlb, start, last); map;
	     map = vhost_iotlb_itree_next(map, start, last)) {
		start = map->start;
		if (pe == map->start && pperm == map->perm) {
			pe = map->last + 1;
		} else {
			if (ps != U64_MAX) {
				if (pe < map->start) {
					/* We have a hole in the map. Check how
					 * many null keys are required to fill it.
					 */
					nnuls = MLX5_DIV_ROUND_UP_POW2(map->start - pe,
								       LOG_MAX_KLM_SIZE);
					mr->num_klms += nnuls;
				}
				err = add_direct_chain(mvdev, ps, pe - ps, pperm, iotlb);
				if (err)
					goto err_chain;
			}
			ps = map->start;
			pe = map->last + 1;
			pperm = map->perm;
		}
	}
	err = add_direct_chain(mvdev, ps, pe - ps, pperm, iotlb);
	if (err)
		goto err_chain;

	/* Create the memory key that defines the guests's address space. This
	 * memory key refers to the direct keys that contain the MTT
	 * translations
	 */
	err = create_indirect_key(mvdev, mr);
	if (err)
		goto err_chain;

	mr->user_mr = true;
	return 0;

err_chain:
	list_for_each_entry_safe_reverse(dmr, n, &mr->head, list) {
		list_del_init(&dmr->list);
		unmap_direct_mr(mvdev, dmr);
		kfree(dmr);
	}
	return err;
}