RX_ENTRIES
iface->rxLoSize = cpu_to_le32(RX_ENTRIES * sizeof(struct rx_desc));
iface->rxHiSize = cpu_to_le32(RX_ENTRIES * sizeof(struct rx_desc));
struct rx_desc rxLo[RX_ENTRIES] __3xp_aligned;
struct rx_desc rxHi[RX_ENTRIES] __3xp_aligned;
*index %= RX_ENTRIES * sizeof(struct rx_desc);