MVXPE_SYSCTL_RX
if (arg->rxtx != MVXPE_SYSCTL_RX && arg->rxtx != MVXPE_SYSCTL_TX)
case MVXPE_SYSCTL_RX:
case MVXPE_SYSCTL_RX:
if (arg->rxtx != MVXPE_SYSCTL_RX)
rxarg->rxtx = MVXPE_SYSCTL_RX;