vhost: add APIs to operate inflight ring

[dpdk.git] / lib / librte_vhost / vhost.c

diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index 1f3e1b1..7b07c8a 100644 (file)
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -823,6 +823,279 @@ rte_vhost_get_vhost_vring(int vid, uint16_t vring_idx,
        return 0;
 }
 
+int
+rte_vhost_set_inflight_desc_split(int vid, uint16_t vring_idx,
+                                 uint16_t idx)
+{
+       struct vhost_virtqueue *vq;
+       struct virtio_net *dev;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       if (unlikely(!vq->inflight_split))
+               return -1;
+
+       if (unlikely(idx >= vq->size))
+               return -1;
+
+       vq->inflight_split->desc[idx].counter = vq->global_counter++;
+       vq->inflight_split->desc[idx].inflight = 1;
+       return 0;
+}
+
+int
+rte_vhost_set_inflight_desc_packed(int vid, uint16_t vring_idx,
+                                  uint16_t head, uint16_t last,
+                                  uint16_t *inflight_entry)
+{
+       struct rte_vhost_inflight_info_packed *inflight_info;
+       struct virtio_net *dev;
+       struct vhost_virtqueue *vq;
+       struct vring_packed_desc *desc;
+       uint16_t old_free_head, free_head;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(!vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       inflight_info = vq->inflight_packed;
+       if (unlikely(!inflight_info))
+               return -1;
+
+       if (unlikely(head >= vq->size))
+               return -1;
+
+       desc = vq->desc_packed;
+       old_free_head = inflight_info->old_free_head;
+       if (unlikely(old_free_head >= vq->size))
+               return -1;
+
+       free_head = old_free_head;
+
+       /* init header descriptor */
+       inflight_info->desc[old_free_head].num = 0;
+       inflight_info->desc[old_free_head].counter = vq->global_counter++;
+       inflight_info->desc[old_free_head].inflight = 1;
+
+       /* save desc entry in flight entry */
+       while (head != ((last + 1) % vq->size)) {
+               inflight_info->desc[old_free_head].num++;
+               inflight_info->desc[free_head].addr = desc[head].addr;
+               inflight_info->desc[free_head].len = desc[head].len;
+               inflight_info->desc[free_head].flags = desc[head].flags;
+               inflight_info->desc[free_head].id = desc[head].id;
+
+               inflight_info->desc[old_free_head].last = free_head;
+               free_head = inflight_info->desc[free_head].next;
+               inflight_info->free_head = free_head;
+               head = (head + 1) % vq->size;
+       }
+
+       inflight_info->old_free_head = free_head;
+       *inflight_entry = old_free_head;
+
+       return 0;
+}
+
+int
+rte_vhost_clr_inflight_desc_split(int vid, uint16_t vring_idx,
+                                 uint16_t last_used_idx, uint16_t idx)
+{
+       struct virtio_net *dev;
+       struct vhost_virtqueue *vq;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       if (unlikely(!vq->inflight_split))
+               return -1;
+
+       if (unlikely(idx >= vq->size))
+               return -1;
+
+       rte_smp_mb();
+
+       vq->inflight_split->desc[idx].inflight = 0;
+
+       rte_smp_mb();
+
+       vq->inflight_split->used_idx = last_used_idx;
+       return 0;
+}
+
+int
+rte_vhost_clr_inflight_desc_packed(int vid, uint16_t vring_idx,
+                                  uint16_t head)
+{
+       struct rte_vhost_inflight_info_packed *inflight_info;
+       struct virtio_net *dev;
+       struct vhost_virtqueue *vq;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(!vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       inflight_info = vq->inflight_packed;
+       if (unlikely(!inflight_info))
+               return -1;
+
+       if (unlikely(head >= vq->size))
+               return -1;
+
+       rte_smp_mb();
+
+       inflight_info->desc[head].inflight = 0;
+
+       rte_smp_mb();
+
+       inflight_info->old_free_head = inflight_info->free_head;
+       inflight_info->old_used_idx = inflight_info->used_idx;
+       inflight_info->old_used_wrap_counter = inflight_info->used_wrap_counter;
+
+       return 0;
+}
+
+int
+rte_vhost_set_last_inflight_io_split(int vid, uint16_t vring_idx,
+                                    uint16_t idx)
+{
+       struct virtio_net *dev;
+       struct vhost_virtqueue *vq;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       if (unlikely(!vq->inflight_split))
+               return -1;
+
+       vq->inflight_split->last_inflight_io = idx;
+       return 0;
+}
+
+int
+rte_vhost_set_last_inflight_io_packed(int vid, uint16_t vring_idx,
+                                     uint16_t head)
+{
+       struct rte_vhost_inflight_info_packed *inflight_info;
+       struct virtio_net *dev;
+       struct vhost_virtqueue *vq;
+       uint16_t last;
+
+       dev = get_device(vid);
+       if (unlikely(!dev))
+               return -1;
+
+       if (unlikely(!(dev->protocol_features &
+           (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))))
+               return 0;
+
+       if (unlikely(!vq_is_packed(dev)))
+               return -1;
+
+       if (unlikely(vring_idx >= VHOST_MAX_VRING))
+               return -1;
+
+       vq = dev->virtqueue[vring_idx];
+       if (unlikely(!vq))
+               return -1;
+
+       inflight_info = vq->inflight_packed;
+       if (unlikely(!inflight_info))
+               return -1;
+
+       if (unlikely(head >= vq->size))
+               return -1;
+
+       last = inflight_info->desc[head].last;
+       if (unlikely(last >= vq->size))
+               return -1;
+
+       inflight_info->desc[last].next = inflight_info->free_head;
+       inflight_info->free_head = head;
+       inflight_info->used_idx += inflight_info->desc[head].num;
+       if (inflight_info->used_idx >= inflight_info->desc_num) {
+               inflight_info->used_idx -= inflight_info->desc_num;
+               inflight_info->used_wrap_counter =
+                       !inflight_info->used_wrap_counter;
+       }
+
+       return 0;
+}
+
 int
 rte_vhost_vring_call(int vid, uint16_t vring_idx)
 {