[dpdk-dev] [RFC 16/24] vhost: remember a vhost_virtqueue's queue index

[Stefan Hajnoczi]

Currently the only way of determining a struct vhost_virtqueue's index
is to search struct virtio_net->virtqueue[] for its address.  Stash the
index in struct vhost_virtqueue so we won't have to search the array.

This new field will be used by virtio-vhost-user.

Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
 drivers/librte_vhost/vhost.h | 1 +
 drivers/librte_vhost/vhost.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/drivers/librte_vhost/vhost.h b/drivers/librte_vhost/vhost.h
index a50b802e7..08ad874ef 100644
--- a/drivers/librte_vhost/vhost.h
+++ b/drivers/librte_vhost/vhost.h
@@ -72,6 +72,7 @@ struct vhost_virtqueue {
        struct vring_avail      *avail;
        struct vring_used       *used;
        uint32_t                size;
+       uint32_t                vring_idx;
 
        uint16_t                last_avail_idx;
        uint16_t                last_used_idx;
diff --git a/drivers/librte_vhost/vhost.c b/drivers/librte_vhost/vhost.c
index 0d95a4b3a..886444683 100644
--- a/drivers/librte_vhost/vhost.c
+++ b/drivers/librte_vhost/vhost.c
@@ -191,6 +191,8 @@ init_vring_queue(struct virtio_net *dev, uint32_t vring_idx)
 
        memset(vq, 0, sizeof(struct vhost_virtqueue));
 
+       vq->vring_idx = vring_idx;
+
        vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
        vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
 
-- 
2.14.3