UVERBS_ATTR_INFO_HANDLES_LIST
out_len = uverbs_attr_get_len(attrs, UVERBS_ATTR_INFO_HANDLES_LIST);
ret = uverbs_copy_to(attrs, UVERBS_ATTR_INFO_HANDLES_LIST, handles,
UVERBS_ATTR_PTR_OUT(UVERBS_ATTR_INFO_HANDLES_LIST,