tx_ring_fields_buf_t
tx_ring_fields_buf_t *buf;
buf = malloc(sizeof (tx_ring_fields_buf_t));
offsetof(tx_ring_fields_buf_t, tr_linkname), print_default_cb},
offsetof(tx_ring_fields_buf_t, tr_type), print_default_cb},
offsetof(tx_ring_fields_buf_t, tr_id), print_default_cb},
offsetof(tx_ring_fields_buf_t, tr_index), print_default_cb},
offsetof(tx_ring_fields_buf_t, tr_opackets), print_default_cb},
offsetof(tx_ring_fields_buf_t, tr_obytes), print_default_cb},