OMNINET_HEADERLEN
#define OMNINET_PAYLOADSIZE (OMNINET_BULKOUTSIZE - OMNINET_HEADERLEN)
if (urb->actual_length <= OMNINET_HEADERLEN || !hdr->oh_len)
data = (char *)urb->transfer_buffer + OMNINET_HEADERLEN;
data_len = min_t(size_t, urb->actual_length - OMNINET_HEADERLEN,
count = kfifo_out_locked(&port->write_fifo, buf + OMNINET_HEADERLEN,