static int scsifront_do_request(struct vscsifrnt_info *info, struct vscsifrnt_shadow *shadow) { struct vscsiif_front_ring *ring = &(info->ring); struct vscsiif_request *ring_req; struct scsi_cmnd *sc = shadow->sc; uint32_t id; int i, notify; if (RING_FULL(&info->ring)) return -EBUSY; id = scsifront_get_rqid(info); /* use id in response */ if (id >= VSCSIIF_MAX_REQS) return -EBUSY; info->shadow[id] = shadow; shadow->rqid = id; ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt); ring->req_prod_pvt++; ring_req->rqid = id; ring_req->act = shadow->act; ring_req->ref_rqid = shadow->ref_rqid; ring_req->nr_segments = shadow->nr_segments; ring_req->id = sc->device->id; ring_req->lun = sc->device->lun; ring_req->channel = sc->device->channel; ring_req->cmd_len = sc->cmd_len; BUG_ON(sc->cmd_len > VSCSIIF_MAX_COMMAND_SIZE); memcpy(ring_req->cmnd, sc->cmnd, sc->cmd_len); ring_req->sc_data_direction = (uint8_t)sc->sc_data_direction; ring_req->timeout_per_command = sc->request->timeout / HZ; for (i = 0; i < (shadow->nr_segments & ~VSCSIIF_SG_GRANT); i++) ring_req->seg[i] = shadow->seg[i]; RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(ring, notify); if (notify) notify_remote_via_irq(info->irq); return 0; }
static struct vscsiif_request *scsifront_pre_req(struct vscsifrnt_info *info) { struct vscsiif_front_ring *ring = &(info->ring); struct vscsiif_request *ring_req; uint32_t id; id = scsifront_get_rqid(info); /* use id in response */ if (id >= VSCSIIF_MAX_REQS) return NULL; ring_req = RING_GET_REQUEST(&(info->ring), ring->req_prod_pvt); ring->req_prod_pvt++; ring_req->rqid = (uint16_t)id; return ring_req; }