net/virtio: support packed ring notification data

This patch supports the feature that the driver passes extra data
(besides identifying the virtqueue) in its device notifications,
expanding the notifications to include the avail index and avail
wrap counter.

Signed-off-by: Cheng Jiang <cheng1.jiang@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

diff --git a/drivers/net/virtio/virtio_ethdev.h b/drivers/net/virtio/virtio_ethdev.h
index a101117..cd89476 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.h
+++ b/drivers/net/virtio/virtio_ethdev.h
@@ -36,7 +36,8 @@
         1ULL << VIRTIO_F_IN_ORDER        |     \
         1ULL << VIRTIO_F_RING_PACKED     |     \
         1ULL << VIRTIO_F_IOMMU_PLATFORM  |     \
-        1ULL << VIRTIO_F_ORDER_PLATFORM)
+        1ULL << VIRTIO_F_ORDER_PLATFORM  |     \
+        1ULL << VIRTIO_F_NOTIFICATION_DATA)
 
 #define VIRTIO_PMD_SUPPORTED_GUEST_FEATURES    \
        (VIRTIO_PMD_DEFAULT_GUEST_FEATURES |    \

diff --git a/drivers/net/virtio/virtio_pci.c b/drivers/net/virtio/virtio_pci.c
index 4468e89..29a354b 100644 (file)
--- a/drivers/net/virtio/virtio_pci.c
+++ b/drivers/net/virtio/virtio_pci.c
@@ -416,9 +416,34 @@ modern_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
 }
 
 static void
-modern_notify_queue(struct virtio_hw *hw __rte_unused, struct virtqueue *vq)
+modern_notify_queue(struct virtio_hw *hw, struct virtqueue *vq)
 {
-       rte_write16(vq->vq_queue_index, vq->notify_addr);
+       uint32_t notify_data;
+
+       if (!vtpci_with_feature(hw, VIRTIO_F_NOTIFICATION_DATA)) {
+               rte_write16(vq->vq_queue_index, vq->notify_addr);
+               return;
+       }
+
+       if (vtpci_with_feature(hw, VIRTIO_F_RING_PACKED)) {
+               /*
+                * Bit[0:15]: vq queue index
+                * Bit[16:30]: avail index
+                * Bit[31]: avail wrap counter
+                */
+               notify_data = ((uint32_t)(!!(vq->vq_packed.cached_flags &
+                               VRING_PACKED_DESC_F_AVAIL)) << 31) |
+                               ((uint32_t)vq->vq_avail_idx << 16) |
+                               vq->vq_queue_index;
+       } else {
+               /*
+                * Bit[0:15]: vq queue index
+                * Bit[16:31]: avail index
+                */
+               notify_data = ((uint32_t)vq->vq_avail_idx << 16) |
+                               vq->vq_queue_index;
+       }
+       rte_write32(notify_data, vq->notify_addr);
 }
 
 const struct virtio_pci_ops modern_ops = {

diff --git a/drivers/net/virtio/virtio_pci.h b/drivers/net/virtio/virtio_pci.h
index a38cb45..7433d2f 100644 (file)
--- a/drivers/net/virtio/virtio_pci.h
+++ b/drivers/net/virtio/virtio_pci.h
@@ -135,6 +135,12 @@ struct virtnet_ctl;
  */
 #define VIRTIO_F_ORDER_PLATFORM 36
 
+/*
+ * This feature indicates that the driver passes extra data (besides
+ * identifying the virtqueue) in its device notifications.
+ */
+#define VIRTIO_F_NOTIFICATION_DATA 38
+
 /* The Guest publishes the used index for which it expects an interrupt
  * at the end of the avail ring. Host should ignore the avail->flags field. */
 /* The Host publishes the avail index for which it expects a kick