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SubjectRe: [PATCH V3 1/3] vDPA/ifcvf: deduce VIRTIO device ID when probe
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在 2021/4/16 下午3:16, Zhu Lingshan 写道:
> This commit deduces VIRTIO device ID as device type when probe,
> then ifcvf_vdpa_get_device_id() can simply return the ID.
> ifcvf_vdpa_get_features() and ifcvf_vdpa_get_config_size()
> can work properly based on the device ID.
>
> Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
> ---
> drivers/vdpa/ifcvf/ifcvf_base.h | 1 +
> drivers/vdpa/ifcvf/ifcvf_main.c | 30 ++++++++++++++++++------------
> 2 files changed, 19 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/vdpa/ifcvf/ifcvf_base.h b/drivers/vdpa/ifcvf/ifcvf_base.h
> index b2eeb16b9c2c..1c04cd256fa7 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_base.h
> +++ b/drivers/vdpa/ifcvf/ifcvf_base.h
> @@ -84,6 +84,7 @@ struct ifcvf_hw {
> u32 notify_off_multiplier;
> u64 req_features;
> u64 hw_features;
> + u32 dev_type;
> struct virtio_pci_common_cfg __iomem *common_cfg;
> void __iomem *net_cfg;
> struct vring_info vring[IFCVF_MAX_QUEUE_PAIRS * 2];
> diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
> index 44d7586019da..469a9b5737b7 100644
> --- a/drivers/vdpa/ifcvf/ifcvf_main.c
> +++ b/drivers/vdpa/ifcvf/ifcvf_main.c
> @@ -323,19 +323,9 @@ static u32 ifcvf_vdpa_get_generation(struct vdpa_device *vdpa_dev)
>
> static u32 ifcvf_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
> {
> - struct ifcvf_adapter *adapter = vdpa_to_adapter(vdpa_dev);
> - struct pci_dev *pdev = adapter->pdev;
> - u32 ret = -ENODEV;
> -
> - if (pdev->device < 0x1000 || pdev->device > 0x107f)
> - return ret;
> -
> - if (pdev->device < 0x1040)
> - ret = pdev->subsystem_device;
> - else
> - ret = pdev->device - 0x1040;
> + struct ifcvf_hw *vf = vdpa_to_vf(vdpa_dev);
>
> - return ret;
> + return vf->dev_type;
> }
>
> static u32 ifcvf_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
> @@ -466,6 +456,22 @@ static int ifcvf_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> pci_set_drvdata(pdev, adapter);
>
> vf = &adapter->vf;
> +
> + /* This drirver drives both modern virtio devices and transitional
> + * devices in modern mode.
> + * vDPA requires feature bit VIRTIO_F_ACCESS_PLATFORM,
> + * so legacy devices and transitional devices in legacy
> + * mode will not work for vDPA, this driver will not
> + * drive devices with legacy interface.
> + */
> + if (pdev->device < 0x1000 || pdev->device > 0x107f)
> + return -EOPNOTSUPP;


So this seems useless, id_table has already did that for us:

The driver supports:

#define IFCVF_DEVICE_ID         0x1041

and

#define C5000X_PL_BLK_DEVICE_ID        0x1001

I think we can never reach the condition above.

Thanks


> +
> + if (pdev->device < 0x1040)
> + vf->dev_type = pdev->subsystem_device;
> + else
> + vf->dev_type = pdev->device - 0x1040;
> +
> vf->base = pcim_iomap_table(pdev);
>
> adapter->pdev = pdev;

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