netdev - Re: [PATCH V3 2/6] vDPA/ifcvf: support userspace to query features and MQ of a management device

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Date:   Mon, 4 Jul 2022 12:43:43 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        parav@...dia.com, xieyongji@...edance.com, gautam.dawar@....com
Subject: Re: [PATCH V3 2/6] vDPA/ifcvf: support userspace to query features
 and MQ of a management device


在 2022/7/1 21:28, Zhu Lingshan 写道:
> Adapting to current netlink interfaces, this commit allows userspace
> to query feature bits and MQ capability of a management device.
>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@...el.com>
> ---
>   drivers/vdpa/ifcvf/ifcvf_base.c | 12 ++++++++++++
>   drivers/vdpa/ifcvf/ifcvf_base.h |  1 +
>   drivers/vdpa/ifcvf/ifcvf_main.c |  3 +++
>   3 files changed, 16 insertions(+)
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.c b/drivers/vdpa/ifcvf/ifcvf_base.c
> index fb957b57941e..7c5f1cc93ad9 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.c
> @@ -346,6 +346,18 @@ int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
>   	return 0;
>   }
>   
> +u16 ifcvf_get_max_vq_pairs(struct ifcvf_hw *hw)
> +{
> +	struct virtio_net_config __iomem *config;
> +	u16 val, mq;
> +
> +	config = hw->dev_cfg;
> +	val = vp_ioread16((__le16 __iomem *)&config->max_virtqueue_pairs);
> +	mq = le16_to_cpu((__force __le16)val);
> +
> +	return mq;
> +}
> +
>   static int ifcvf_hw_enable(struct ifcvf_hw *hw)
>   {
>   	struct virtio_pci_common_cfg __iomem *cfg;
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
> index f5563f665cc6..d54a1bed212e 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
> @@ -130,6 +130,7 @@ u64 ifcvf_get_hw_features(struct ifcvf_hw *hw);
>   int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features);
>   u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid);
>   int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num);
> +u16 ifcvf_get_max_vq_pairs(struct ifcvf_hw *hw);
>   struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw);
>   int ifcvf_probed_virtio_net(struct ifcvf_hw *hw);
>   u32 ifcvf_get_config_size(struct ifcvf_hw *hw);
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> index 0a5670729412..3ff7096d30f1 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -791,6 +791,9 @@ static int ifcvf_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
>   	vf->hw_features = ifcvf_get_hw_features(vf);
>   	vf->config_size = ifcvf_get_config_size(vf);
>   
> +	ifcvf_mgmt_dev->mdev.max_supported_vqs = ifcvf_get_max_vq_pairs(vf);


Do we want #qps or #queues?

FYI, vp_vdpa did:

drivers/vdpa/virtio_pci/vp_vdpa.c: mgtdev->max_supported_vqs = 
vp_modern_get_num_queues(mdev);

Thanks


> +	ifcvf_mgmt_dev->mdev.supported_features = vf->hw_features;
> +
>   	adapter->vdpa.mdev = &ifcvf_mgmt_dev->mdev;
>   	ret = _vdpa_register_device(&adapter->vdpa, vf->nr_vring);
>   	if (ret) {