eventdev: reserve space in main structs for extension

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

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index c76d401..9f11b28 100644 (file)
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -39,6 +39,38 @@
 
 #define VHOST_LOG_CACHE_NR 32
 
+#define PACKED_DESC_ENQUEUE_USED_FLAG(w)       \
+       ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED | VRING_DESC_F_WRITE) : \
+               VRING_DESC_F_WRITE)
+#define PACKED_DESC_DEQUEUE_USED_FLAG(w)       \
+       ((w) ? (VRING_DESC_F_AVAIL | VRING_DESC_F_USED) : 0x0)
+#define PACKED_DESC_SINGLE_DEQUEUE_FLAG (VRING_DESC_F_NEXT | \
+                                        VRING_DESC_F_INDIRECT)
+
+#define PACKED_BATCH_SIZE (RTE_CACHE_LINE_SIZE / \
+                           sizeof(struct vring_packed_desc))
+#define PACKED_BATCH_MASK (PACKED_BATCH_SIZE - 1)
+
+#ifdef VHOST_GCC_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("GCC unroll 4") \
+       for (iter = val; iter < size; iter++)
+#endif
+
+#ifdef VHOST_CLANG_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll 4") \
+       for (iter = val; iter < size; iter++)
+#endif
+
+#ifdef VHOST_ICC_UNROLL_PRAGMA
+#define vhost_for_each_try_unroll(iter, val, size) _Pragma("unroll (4)") \
+       for (iter = val; iter < size; iter++)
+#endif
+
+#ifndef vhost_for_each_try_unroll
+#define vhost_for_each_try_unroll(iter, val, num) \
+       for (iter = val; iter < num; iter++)
+#endif
+
 /**
  * Structure contains buffer address, length and descriptor index
  * from vring to do scatter RX.
@@ -84,6 +116,7 @@ struct log_cache_entry {
 
 struct vring_used_elem_packed {
        uint16_t id;
+       uint16_t flags;
        uint32_t len;
        uint32_t count;
 };
@@ -147,6 +180,10 @@ struct vhost_virtqueue {
                struct vring_used_elem_packed *shadow_used_packed;
        };
        uint16_t                shadow_used_idx;
+       /* Record packed ring enqueue latest desc cache aligned index */
+       uint16_t                shadow_aligned_idx;
+       /* Record packed ring first dequeue desc index */
+       uint16_t                shadow_last_used_idx;
        struct vhost_vring_addr ring_addrs;
 
        struct batch_copy_elem  *batch_copy_elems;
@@ -367,6 +404,26 @@ desc_is_avail(struct vring_packed_desc *desc, bool wrap_counter)
                wrap_counter != !!(flags & VRING_DESC_F_USED);
 }
 
+static inline void
+vq_inc_last_used_packed(struct vhost_virtqueue *vq, uint16_t num)
+{
+       vq->last_used_idx += num;
+       if (vq->last_used_idx >= vq->size) {
+               vq->used_wrap_counter ^= 1;
+               vq->last_used_idx -= vq->size;
+       }
+}
+
+static inline void
+vq_inc_last_avail_packed(struct vhost_virtqueue *vq, uint16_t num)
+{
+       vq->last_avail_idx += num;
+       if (vq->last_avail_idx >= vq->size) {
+               vq->avail_wrap_counter ^= 1;
+               vq->last_avail_idx -= vq->size;
+       }
+}
+
 void __vhost_log_cache_write(struct virtio_net *dev,
                struct vhost_virtqueue *vq,
                uint64_t addr, uint64_t len);