> -----Original Message-----
> From: Maxime Coquelin <maxime.coque...@redhat.com>
> Sent: Wednesday, November 30, 2022 11:57 PM
> To: dev@dpdk.org; Xia, Chenbo <chenbo....@intel.com>;
> david.march...@redhat.com; epere...@redhat.com
> Cc: Maxime Coquelin <maxime.coque...@redhat.com>
> Subject: [PATCH v1 16/21] net/virtio-user: allocate shadow control queue
>
> 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.coque...@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(-)
>
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> index a3584e7735..16a0e07413 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
> @@ -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)
> {
> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> index 3c5453eac0..e0db4faf3f 100644
> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
> @@ -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);
> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
> b/drivers/net/virtio/virtio_user_ethdev.c
> index 6c3e875793..626bd95b62 100644
> --- a/drivers/net/virtio/virtio_user_ethdev.c
> +++ b/drivers/net/virtio/virtio_user_ethdev.c
> @@ -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) && dev->scvq)
> + virtio_user_dev_destroy_shadow_cvq(dev);
> }
>
> static void
> --
> 2.38.1
Reviewed-by: Chenbo Xia <chenbo....@intel.com>
