ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT
val = 1 << ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT;
1 << ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT;
bd->data.bd_flags.bitfields = BIT(ETH_TX_1ST_BD_FLAGS_START_BD_SHIFT);