net/virtio: initiate vring at init stage

[dpdk.git] / drivers / net / virtio / virtio_ethdev.c

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 245965c..7b90d71 100644 (file)
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -308,6 +308,35 @@ virtio_get_nr_vq(struct virtio_hw *hw)
        return nr_vq;
 }
 
+static void
+virtio_init_vring(struct virtqueue *vq)
+{
+       int size = vq->vq_nentries;
+       struct vring *vr = &vq->vq_ring;
+       uint8_t *ring_mem = vq->vq_ring_virt_mem;
+
+       PMD_INIT_FUNC_TRACE();
+
+       /*
+        * Reinitialise since virtio port might have been stopped and restarted
+        */
+       memset(ring_mem, 0, vq->vq_ring_size);
+       vring_init(vr, size, ring_mem, VIRTIO_PCI_VRING_ALIGN);
+       vq->vq_used_cons_idx = 0;
+       vq->vq_desc_head_idx = 0;
+       vq->vq_avail_idx = 0;
+       vq->vq_desc_tail_idx = (uint16_t)(vq->vq_nentries - 1);
+       vq->vq_free_cnt = vq->vq_nentries;
+       memset(vq->vq_descx, 0, sizeof(struct vq_desc_extra) * vq->vq_nentries);
+
+       vring_desc_init(vr->desc, size);
+
+       /*
+        * Disable device(host) interrupting guest
+        */
+       virtqueue_disable_intr(vq);
+}
+
 static int
 virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
 {
@@ -371,7 +400,6 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
        vq->hw = hw;
        vq->vq_queue_index = vtpci_queue_idx;
        vq->vq_nentries = vq_size;
-       vq->vq_free_cnt = vq_size;
 
        /*
         * Reserve a memzone for vring elements
@@ -402,6 +430,8 @@ virtio_init_queue(struct rte_eth_dev *dev, uint16_t vtpci_queue_idx)
        PMD_INIT_LOG(DEBUG, "vq->vq_ring_virt_mem: 0x%" PRIx64,
                     (uint64_t)(uintptr_t)mz->addr);
 
+       virtio_init_vring(vq);
+
        if (sz_hdr_mz) {
                snprintf(vq_hdr_name, sizeof(vq_hdr_name), "port%d_vq%d_hdr",
                         dev->data->port_id, vtpci_queue_idx);