BUF_SIZE_2KiB
#define DMA_BUFFER_SIZE BUF_SIZE_2KiB
bmax = BUF_SIZE_2KiB;
(!enh_desc && (len > BUF_SIZE_2KiB)))
if (bfsize >= BUF_SIZE_2KiB) {
bfsize2 = min(bfsize - BUF_SIZE_2KiB + 1, BUF_SIZE_2KiB - 1);
unsigned int buffer1_max_length = BUF_SIZE_2KiB - 1;
bfsize1 = min(bfsize, BUF_SIZE_2KiB - 1);
bmax = BUF_SIZE_2KiB;
else if (mtu >= BUF_SIZE_2KiB)
ret = BUF_SIZE_2KiB;