shmif_nextpktoff
busmem->shm_last = shmif_nextpktoff(busmem, busmem->shm_last);
lastoff = shmif_nextpktoff(busmem, busmem->shm_last);
shmif_nextpktoff(busmem, busmem->shm_last)
busmem->shm_first = shmif_nextpktoff(busmem, busmem->shm_first);
uint32_t shmif_nextpktoff(struct shmif_mem *, uint32_t);
bmem->shm_last = shmif_nextpktoff(bmem, bmem->shm_last);