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Date: Mon, 28 Feb 2022 10:57:57 +0000
From: Gautam Dawar <gdawar@...inx.com>
To: Jason Wang <jasowang@...hat.com>
CC: Martin Petrus Hubertus Habets <martinh@...inx.com>,
Harpreet Singh Anand <hanand@...inx.com>,
Tanuj Murlidhar Kamde <tanujk@...inx.com>,
"eperezma@...hat.com" <eperezma@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Zhu Lingshan <lingshan.zhu@...el.com>,
Stefano Garzarella <sgarzare@...hat.com>,
Xie Yongji <xieyongji@...edance.com>,
Eli Cohen <elic@...dia.com>,
Si-Wei Liu <si-wei.liu@...cle.com>,
Parav Pandit <parav@...dia.com>,
Longpeng <longpeng2@...wei.com>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [RFC PATCH v2 05/19] vdpa: introduce virtqueue groups
在 2022/2/25 上午5:22, Gautam Dawar 写道:
> This patch introduces virtqueue groups to vDPA device. The virtqueue
> group is the minimal set of virtqueues that must share an address
> space. And the address space identifier could only be attached to a
> specific virtqueue group.
>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> Signed-off-by: Gautam Dawar <gdawar@...inx.com>
> ---
> drivers/vdpa/ifcvf/ifcvf_main.c | 8 +++++++-
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 8 +++++++-
> drivers/vdpa/vdpa.c | 3 +++
> drivers/vdpa/vdpa_sim/vdpa_sim.c | 9 ++++++++-
> drivers/vdpa/vdpa_sim/vdpa_sim.h | 1 +
> include/linux/vdpa.h | 16 ++++++++++++----
> 6 files changed, 38 insertions(+), 7 deletions(-)
We had three more parents now, so we should convert them as well:
vp_vdpa, VDUSE and eni_vdpa.
[GD>>] I agree. However, the intention of publishing this as a RFC series is to gather feedback on the approach in the cover letter and at the same time to test its integration with both a simulator (vdpa_sim) and an actual (Xilinx SmartNIC) HW device with a development build of QEMU supporting Shadow virtqueue by Eugnio.
Once this is approved, we can move to the actual patch series covering all other vdpa parent drivers.
Thanks
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c
> b/drivers/vdpa/ifcvf/ifcvf_main.c index d1a6b5ab543c..c815a2e62440
> 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_m
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -378,6 +378,11 @@ static size_t ifcvf_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
> return vf->config_size;
> }
>
> +static u32 ifcvf_vdpa_get_vq_group(struct vdpa_device *vdpa, u16 idx)
> +{
> + return 0;
> +}
> +
> static void ifcvf_vdpa_get_config(struct vdpa_device *vdpa_dev,
> unsigned int offset,
> void *buf, unsigned int len)
> @@ -453,6 +458,7 @@ static const struct vdpa_config_ops ifc_vdpa_ops = {
> .get_device_id = ifcvf_vdpa_get_device_id,
> .get_vendor_id = ifcvf_vdpa_get_vendor_id,
> .get_vq_align = ifcvf_vdpa_get_vq_align,
> + .get_vq_group = ifcvf_vdpa_get_vq_group,
> .get_config_size = ifcvf_vdpa_get_config_size,
> .get_config = ifcvf_vdpa_get_config,
> .set_config = ifcvf_vdpa_set_config,
> @@ -507,7 +513,7 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
> pdev = ifcvf_mgmt_dev->pdev;
> dev = &pdev->dev;
> adapter = vdpa_alloc_device(struct ifcvf_adapter, vdpa,
> - dev, &ifc_vdpa_ops, name, false);
> + dev, &ifc_vdpa_ops, 1, name, false);
> if (IS_ERR(adapter)) {
> IFCVF_ERR(pdev, "Failed to allocate vDPA structure");
> return PTR_ERR(adapter);
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index b53603d94082..fcfc28460b72 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -1847,6 +1847,11 @@ static u32 mlx5_vdpa_get_vq_align(struct vdpa_device *vdev)
> return PAGE_SIZE;
> }
>
> +static u32 mlx5_vdpa_get_vq_group(struct vdpa_device *vdpa, u16 idx)
> +{
> + return 0;
> +}
> +
> enum { MLX5_VIRTIO_NET_F_GUEST_CSUM = 1 << 9,
> MLX5_VIRTIO_NET_F_CSUM = 1 << 10,
> MLX5_VIRTIO_NET_F_HOST_TSO6 = 1 << 11, @@ -2363,6 +2368,7 @@ static
> const struct vdpa_config_ops mlx5_vdpa_ops = {
> .get_vq_notification = mlx5_get_vq_notification,
> .get_vq_irq = mlx5_get_vq_irq,
> .get_vq_align = mlx5_vdpa_get_vq_align,
> + .get_vq_group = mlx5_vdpa_get_vq_group,
> .get_device_features = mlx5_vdpa_get_device_features,
> .set_driver_features = mlx5_vdpa_set_driver_features,
> .get_driver_features = mlx5_vdpa_get_driver_features, @@ -2575,7
> +2581,7 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
> }
>
> ndev = vdpa_alloc_device(struct mlx5_vdpa_net, mvdev.vdev, mdev->device, &mlx5_vdpa_ops,
> - name, false);
> + 1, name, false);
> if (IS_ERR(ndev))
> return PTR_ERR(ndev);
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c index
> 9846c9de4bfa..a07bf0130559 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -159,6 +159,7 @@ static void vdpa_release_dev(struct device *d)
> * initialized but before registered.
> * @parent: the parent device
> * @config: the bus operations that is supported by this device
> + * @ngroups: number of groups supported by this device
> * @size: size of the parent structure that contains private data
> * @name: name of the vdpa device; optional.
> * @use_va: indicate whether virtual address must be used by this
> device @@ -171,6 +172,7 @@ static void vdpa_release_dev(struct device *d)
> */
> struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> const struct vdpa_config_ops *config,
> + unsigned int ngroups,
> size_t size, const char *name,
> bool use_va)
> {
> @@ -203,6 +205,7 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> vdev->config = config;
> vdev->features_valid = false;
> vdev->use_va = use_va;
> + vdev->ngroups = ngroups;
>
> if (name)
> err = dev_set_name(&vdev->dev, "%s", name); diff --git
> a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index ddbe142af09a..c98cb1f869fa 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -250,7 +250,7 @@ struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
> else
> ops = &vdpasim_config_ops;
>
> - vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops,
> + vdpasim = vdpa_alloc_device(struct vdpasim, vdpa, NULL, ops, 1,
> dev_attr->name, false);
> if (IS_ERR(vdpasim)) {
> ret = PTR_ERR(vdpasim);
> @@ -399,6 +399,11 @@ static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
> return VDPASIM_QUEUE_ALIGN;
> }
>
> +static u32 vdpasim_get_vq_group(struct vdpa_device *vdpa, u16 idx) {
> + return 0;
> +}
> +
> static u64 vdpasim_get_device_features(struct vdpa_device *vdpa)
> {
> struct vdpasim *vdpasim = vdpa_to_sim(vdpa); @@ -620,6 +625,7 @@
> static const struct vdpa_config_ops vdpasim_config_ops = {
> .set_vq_state = vdpasim_set_vq_state,
> .get_vq_state = vdpasim_get_vq_state,
> .get_vq_align = vdpasim_get_vq_align,
> + .get_vq_group = vdpasim_get_vq_group,
> .get_device_features = vdpasim_get_device_features,
> .set_driver_features = vdpasim_set_driver_features,
> .get_driver_features = vdpasim_get_driver_features,
> @@ -650,6 +656,7 @@ static const struct vdpa_config_ops vdpasim_batch_config_ops = {
> .set_vq_state = vdpasim_set_vq_state,
> .get_vq_state = vdpasim_get_vq_state,
> .get_vq_align = vdpasim_get_vq_align,
> + .get_vq_group = vdpasim_get_vq_group,
> .get_device_features = vdpasim_get_device_features,
> .set_driver_features = vdpasim_set_driver_features,
> .get_driver_features = vdpasim_get_driver_features,
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> index cd58e888bcf3..0be7c1e7ef80 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.h
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.h
> @@ -63,6 +63,7 @@ struct vdpasim {
> u32 status;
> u32 generation;
> u64 features;
> + u32 groups;
> /* spinlock to synchronize iommu table */
> spinlock_t iommu_lock;
> };
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h index
> 2de442ececae..026b7ad72ed7 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -85,6 +85,7 @@ struct vdpa_device {
> bool use_va;
> int nvqs;
> struct vdpa_mgmt_dev *mdev;
> + unsigned int ngroups;
> };
>
> /**
> @@ -172,6 +173,10 @@ struct vdpa_map_file {
> * for the device
> * @vdev: vdpa device
> * Returns virtqueue algin requirement
> + * @get_vq_group: Get the group id for a specific virtqueue
> + * @vdev: vdpa device
> + * @idx: virtqueue index
> + * Returns u32: group id for this virtqueue
> * @get_device_features: Get virtio features supported by the device
> * @vdev: vdpa device
> * Returns the virtio features support by the
> @@ -282,6 +287,7 @@ struct vdpa_config_ops {
>
> /* Device ops */
> u32 (*get_vq_align)(struct vdpa_device *vdev);
> + u32 (*get_vq_group)(struct vdpa_device *vdev, u16 idx);
> u64 (*get_device_features)(struct vdpa_device *vdev);
> int (*set_driver_features)(struct vdpa_device *vdev, u64 features);
> u64 (*get_driver_features)(struct vdpa_device *vdev); @@ -314,6
> +320,7 @@ struct vdpa_config_ops {
>
> struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> const struct vdpa_config_ops *config,
> + unsigned int ngroups,
> size_t size, const char *name,
> bool use_va);
>
> @@ -324,17 +331,18 @@ struct vdpa_device *__vdpa_alloc_device(struct device *parent,
> * @member: the name of struct vdpa_device within the @dev_struct
> * @parent: the parent device
> * @config: the bus operations that is supported by this device
> + * @ngroups: the number of virtqueue groups supported by this device
> * @name: name of the vdpa device
> * @use_va: indicate whether virtual address must be used by this device
> *
> * Return allocated data structure or ERR_PTR upon error
> */
> -#define vdpa_alloc_device(dev_struct, member, parent, config, name, use_va) \
> - container_of(__vdpa_alloc_device( \
> - parent, config, \
> +#define vdpa_alloc_device(dev_struct, member, parent, config, ngroups, name, use_va) \
> + container_of((__vdpa_alloc_device( \
> + parent, config, ngroups, \
> sizeof(dev_struct) + \
> BUILD_BUG_ON_ZERO(offsetof( \
> - dev_struct, member)), name, use_va), \
> + dev_struct, member)), name, use_va)), \
> dev_struct, member)
>
> int vdpa_register_device(struct vdpa_device *vdev, int nvqs);
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