srp_free_iu
srp_free_iu(target->srp_host, ch->rx_ring[i]);
srp_free_iu(target->srp_host, ch->tx_ring[i]);
srp_free_iu(target->srp_host, ch->rx_ring[i]);
srp_free_iu(target->srp_host, ch->tx_ring[i]);