kfifo_skip_count
kfifo_skip_count(&dev->ih_fifo, dev->kfd->device_info.ih_ring_entry_size);
kfifo_skip_count(&tport->xmit_fifo, count);
kfifo_skip_count(&tport->xmit_fifo, s);
#define kfifo_skip(fifo) kfifo_skip_count(fifo, 1)
kfifo_skip_count(___tmp, (len) / sizeof(*___tmp->type)); \
kfifo_skip_count(&tport->xmit_fifo, chars);