Virtio spec allows the device to specify the per virtqueue max queue size. vDPA needs to adapt to this flexibility. E.g Qemu advertise a small control virtqueue for virtio-net.
So this patch adds a index parameter to get_vq_num_max bus operations for the device to report its per virtqueue max queue size. Both VHOST_VDPA_GET_VRING_NUM and VDPA_ATTR_DEV_MAX_VQ_SIZE assume a global maximum size. So we iterate all the virtqueues to return the minimal size in this case. Actually, the VHOST_VDPA_GET_VRING_NUM is not a must for the userspace. Userspace may choose to check the VHOST_SET_VRING_NUM for proving or validating the maximum virtqueue size. Anyway, we can invent a per vq version of VHOST_VDPA_GET_VRING_NUM in the future if it's necessary. Signed-off-by: Jason Wang <[email protected]> --- drivers/vdpa/ifcvf/ifcvf_main.c | 2 +- drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- drivers/vdpa/vdpa.c | 22 +++++++++++++++++++++- drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +- drivers/vdpa/virtio_pci/vp_vdpa.c | 2 +- drivers/vhost/vdpa.c | 9 ++++++--- drivers/virtio/virtio_vdpa.c | 2 +- include/linux/vdpa.h | 5 ++++- 8 files changed, 36 insertions(+), 10 deletions(-) diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c index ab0ab5cf0f6e..646b340db2af 100644 --- a/drivers/vdpa/ifcvf/ifcvf_main.c +++ b/drivers/vdpa/ifcvf/ifcvf_main.c @@ -254,7 +254,7 @@ static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status) ifcvf_set_status(vf, status); } -static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev) +static u16 ifcvf_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev, u16 qid) { return IFCVF_QUEUE_MAX; } diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c index dda5dc6f7737..afd6114d07b0 100644 --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c @@ -1584,7 +1584,7 @@ static void mlx5_vdpa_set_config_cb(struct vdpa_device *vdev, struct vdpa_callba } #define MLX5_VDPA_MAX_VQ_ENTRIES 256 -static u16 mlx5_vdpa_get_vq_num_max(struct vdpa_device *vdev) +static u16 mlx5_vdpa_get_vq_num_max(struct vdpa_device *vdev, u16 idx) { return MLX5_VDPA_MAX_VQ_ENTRIES; } diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index bb3f1d1f0422..d77d59811389 100644 --- a/drivers/vdpa/vdpa.c +++ b/drivers/vdpa/vdpa.c @@ -239,6 +239,26 @@ void vdpa_unregister_driver(struct vdpa_driver *drv) } EXPORT_SYMBOL_GPL(vdpa_unregister_driver); +/** + * vdpa_get_vq_num_max - get the maximum virtqueue size + * @vdev: vdpa device + */ +u16 vdpa_get_vq_num_max(struct vdpa_device *vdev) +{ + const struct vdpa_config_ops *ops = vdev->config; + u16 s, size = ops->get_vq_num_max(vdev, 0); + int i; + + for (i = 1; i < vdev->nvqs; i++) { + s = ops->get_vq_num_max(vdev, i); + if (s && s < size) + size = s; + } + + return size; +} +EXPORT_SYMBOL_GPL(vdpa_get_vq_num_max); + /** * vdpa_mgmtdev_register - register a vdpa management device * @@ -502,7 +522,7 @@ vdpa_dev_fill(struct vdpa_device *vdev, struct sk_buff *msg, u32 portid, u32 seq device_id = vdev->config->get_device_id(vdev); vendor_id = vdev->config->get_vendor_id(vdev); - max_vq_size = vdev->config->get_vq_num_max(vdev); + max_vq_size = vdpa_get_vq_num_max(vdev); err = -EMSGSIZE; if (nla_put_string(msg, VDPA_ATTR_DEV_NAME, dev_name(&vdev->dev))) diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c index 98f793bc9376..49e29056f164 100644 --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c @@ -422,7 +422,7 @@ static void vdpasim_set_config_cb(struct vdpa_device *vdpa, /* We don't support config interrupt */ } -static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa) +static u16 vdpasim_get_vq_num_max(struct vdpa_device *vdpa, u16 idx) { return VDPASIM_QUEUE_MAX; } diff --git a/drivers/vdpa/virtio_pci/vp_vdpa.c b/drivers/vdpa/virtio_pci/vp_vdpa.c index c76ebb531212..2926641fb586 100644 --- a/drivers/vdpa/virtio_pci/vp_vdpa.c +++ b/drivers/vdpa/virtio_pci/vp_vdpa.c @@ -195,7 +195,7 @@ static void vp_vdpa_set_status(struct vdpa_device *vdpa, u8 status) vp_vdpa_free_irq(vp_vdpa); } -static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa) +static u16 vp_vdpa_get_vq_num_max(struct vdpa_device *vdpa, u16 qid) { return VP_VDPA_QUEUE_MAX; } diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index fb41db3da611..c9ec395b8c42 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -289,11 +289,14 @@ static long vhost_vdpa_set_features(struct vhost_vdpa *v, u64 __user *featurep) static long vhost_vdpa_get_vring_num(struct vhost_vdpa *v, u16 __user *argp) { - struct vdpa_device *vdpa = v->vdpa; - const struct vdpa_config_ops *ops = vdpa->config; u16 num; - num = ops->get_vq_num_max(vdpa); + /* + * VHOST_VDPA_GET_VRING_NUM asssumes a global max virtqueue + * size. So we need to iterate all the virtqueue and return + * the minimal one here. + */ + num = vdpa_get_vq_num_max(v->vdpa); if (copy_to_user(argp, &num, sizeof(num))) return -EFAULT; diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c index e28acf482e0c..a43bd5ec5ac6 100644 --- a/drivers/virtio/virtio_vdpa.c +++ b/drivers/virtio/virtio_vdpa.c @@ -158,7 +158,7 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index, if (!info) return ERR_PTR(-ENOMEM); - num = ops->get_vq_num_max(vdpa); + num = ops->get_vq_num_max(vdpa, index); if (num == 0) { err = -ENOENT; goto error_new_virtqueue; diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index f311d227aa1b..0f8977a54783 100644 --- a/include/linux/vdpa.h +++ b/include/linux/vdpa.h @@ -137,6 +137,7 @@ struct vdpa_iova_range { * @cb: virtio-vdev interrupt callback structure * @get_vq_num_max: Get the max size of virtqueue * @vdev: vdpa device + * @idx: virtqueue index * Returns u16: max size of virtqueue * @get_device_id: Get virtio device id * @vdev: vdpa device @@ -229,7 +230,7 @@ struct vdpa_config_ops { int (*set_features)(struct vdpa_device *vdev, u64 features); void (*set_config_cb)(struct vdpa_device *vdev, struct vdpa_callback *cb); - u16 (*get_vq_num_max)(struct vdpa_device *vdev); + u16 (*get_vq_num_max)(struct vdpa_device *vdev, u16 idx); u32 (*get_device_id)(struct vdpa_device *vdev); u32 (*get_vendor_id)(struct vdpa_device *vdev); u8 (*get_status)(struct vdpa_device *vdev); @@ -270,6 +271,8 @@ void vdpa_unregister_device(struct vdpa_device *vdev); int _vdpa_register_device(struct vdpa_device *vdev, int nvqs); void _vdpa_unregister_device(struct vdpa_device *vdev); +u16 vdpa_get_vq_num_max(struct vdpa_device *vdev); + /** * struct vdpa_driver - operations for a vDPA driver * @driver: underlying device driver -- 2.25.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
