If the backends supports control virtqueue, allocate a
shadow control virtqueue, and implement the notify callback
that writes into the kickfd.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
---
.../net/virtio/virtio_user/virtio_user_dev.c | 47 ++++++++++++++++++-
.../net/virtio/virtio_user/virtio_user_dev.h | 5 ++
drivers/net/virtio/virtio_user_ethdev.c | 6 +++
3 files changed, 56 insertions(+), 2 deletions(-)
@@ -146,8 +146,9 @@ virtio_user_dev_set_features(struct virtio_user_dev *dev)
/* Strip VIRTIO_NET_F_MAC, as MAC address is handled in vdev init */
features &= ~(1ull << VIRTIO_NET_F_MAC);
- /* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
- features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
+ /* Strip VIRTIO_NET_F_CTRL_VQ if the devices does not really support control VQ */
+ if (!dev->hw_cvq)
+ features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
features &= ~(1ull << VIRTIO_NET_F_STATUS);
ret = dev->ops->set_features(dev, features);
if (ret < 0)
@@ -911,6 +912,48 @@ virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx)
}
}
+static void
+virtio_user_control_queue_notify(struct virtqueue *vq, void *cookie)
+{
+ struct virtio_user_dev *dev = cookie;
+ uint64_t buf = 1;
+
+ if (write(dev->kickfds[vq->vq_queue_index], &buf, sizeof(buf)) < 0)
+ PMD_DRV_LOG(ERR, "failed to kick backend: %s",
+ strerror(errno));
+}
+
+int
+virtio_user_dev_create_shadow_cvq(struct virtio_user_dev *dev, struct virtqueue *vq)
+{
+ char name[VIRTQUEUE_MAX_NAME_SZ];
+ struct virtqueue *scvq;
+
+ snprintf(name, sizeof(name), "port%d_shadow_cvq", vq->hw->port_id);
+ scvq = virtqueue_alloc(&dev->hw, vq->vq_queue_index, vq->vq_nentries,
+ VTNET_CQ, SOCKET_ID_ANY, name);
+ if (!scvq) {
+ PMD_INIT_LOG(ERR, "(%s) Failed to alloc shadow control vq\n", dev->path);
+ return -ENOMEM;
+ }
+
+ scvq->cq.notify_queue = &virtio_user_control_queue_notify;
+ scvq->cq.notify_cookie = dev;
+ dev->scvq = scvq;
+
+ return 0;
+}
+
+void
+virtio_user_dev_destroy_shadow_cvq(struct virtio_user_dev *dev)
+{
+ if (!dev->scvq)
+ return;
+
+ virtqueue_free(dev->scvq);
+ dev->scvq = NULL;
+}
+
int
virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status)
{
@@ -58,6 +58,9 @@ struct virtio_user_dev {
pthread_mutex_t mutex;
bool started;
+ bool hw_cvq;
+ struct virtqueue *scvq;
+
void *backend_data;
};
@@ -74,6 +77,8 @@ void virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx);
void virtio_user_handle_cq_packed(struct virtio_user_dev *dev,
uint16_t queue_idx);
uint8_t virtio_user_handle_mq(struct virtio_user_dev *dev, uint16_t q_pairs);
+int virtio_user_dev_create_shadow_cvq(struct virtio_user_dev *dev, struct virtqueue *vq);
+void virtio_user_dev_destroy_shadow_cvq(struct virtio_user_dev *dev);
int virtio_user_dev_set_status(struct virtio_user_dev *dev, uint8_t status);
int virtio_user_dev_update_status(struct virtio_user_dev *dev);
int virtio_user_dev_update_link_state(struct virtio_user_dev *dev);
@@ -232,6 +232,9 @@ virtio_user_setup_queue(struct virtio_hw *hw, struct virtqueue *vq)
else
virtio_user_setup_queue_split(vq, dev);
+ if (dev->hw_cvq && hw->cvq && (virtnet_cq_to_vq(hw->cvq) == vq))
+ return virtio_user_dev_create_shadow_cvq(dev, vq);
+
return 0;
}
@@ -251,6 +254,9 @@ virtio_user_del_queue(struct virtio_hw *hw, struct virtqueue *vq)
close(dev->callfds[vq->vq_queue_index]);
close(dev->kickfds[vq->vq_queue_index]);
+
+ if (hw->cvq && (virtnet_cq_to_vq(hw->cvq) == vq))
+ virtio_user_dev_destroy_shadow_cvq(dev);
}
static void