PCH_GBE_MIN_RXD
clamp_val(ring->rx_pending, PCH_GBE_MIN_RXD, PCH_GBE_MAX_RXD);
clamp_val(ring->tx_pending, PCH_GBE_MIN_RXD, PCH_GBE_MAX_RXD);
.arg = { .r = { .min = PCH_GBE_MIN_RXD,