ETH_CACHE_LINE_SIZE
(((size) + ETH_CACHE_LINE_SIZE - 1) & ~(ETH_CACHE_LINE_SIZE - 1))
ETH_CACHE_LINE_SIZE)
rx_buffer_size = mtu + 14 + 4 + 8 + ETH_CACHE_LINE_SIZE;
rx_buffer_size = (rx_buffer_size + ETH_CACHE_LINE_SIZE - 1) &
~(ETH_CACHE_LINE_SIZE - 1);