ENETC_PF_NUM_RINGS
val = ENETC_PSICFGR0_SET_TXBDR(ENETC_PF_NUM_RINGS);
val |= ENETC_PSICFGR0_SET_RXBDR(ENETC_PF_NUM_RINGS);
if (unlikely(num_rings < ENETC_PF_NUM_RINGS)) {
num_rings, ENETC_PF_NUM_RINGS);
num_rings -= ENETC_PF_NUM_RINGS;