Messages in this thread | | | Subject | Re: [PATCH 1/3] vDPA/ifcvf: deduce VIRTIO device ID when probe | From | Zhu Lingshan <> | Date | Thu, 15 Apr 2021 14:36:15 +0800 |
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On 4/15/2021 2:30 PM, Jason Wang wrote: > > 在 2021/4/15 下午1:52, Zhu Lingshan 写道: >> >> >> On 4/15/2021 11:30 AM, Jason Wang wrote: >>> >>> 在 2021/4/14 下午5:18, 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 | 22 ++++++++++------------ >>>> 2 files changed, 11 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..99b0a6b4c227 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 +456,14 @@ static int ifcvf_probe(struct pci_dev *pdev, >>>> const struct pci_device_id *id) >>>> pci_set_drvdata(pdev, adapter); >>>> vf = &adapter->vf; >>>> + if (pdev->device < 0x1000 || pdev->device > 0x107f) >>>> + return -EOPNOTSUPP; >>>> + >>>> + if (pdev->device < 0x1040) >>>> + vf->dev_type = pdev->subsystem_device; >>>> + else >>>> + vf->dev_type = pdev->device - 0x1040; >>> >>> >>> So a question here, is the device a transtional device or modern one? >>> >>> If it's a transitonal one, can it swtich endianess automatically or >>> not? >>> >>> Thanks >> Hi Jason, >> >> This driver should drive both modern and transitional devices as we >> discussed before. >> If it's a transitional one, it will act as a modern device by >> default, legacy mode is a fail-over path. > > > Note that legacy driver use native endian, support legacy driver > requires the device to know native endian which I'm not sure your > device can do that. > > Thanks Yes, legacy requires guest native endianess, I think we don't need to worry about this because our transitional device should work in modern mode by default(legacy mode is the failover path we will never reach, get_features will fail if no ACCESS_PLATFORM), we don't support legacy device in vDPA.
Thanks > > >> For vDPA, it has to support VIRTIO_1 and ACCESS_PLATFORM, so it must >> in modern mode. >> I think we don't need to worry about endianess for legacy mode. >> >> Thanks >> Zhu Lingshan >>> >>> >>>> + >>>> vf->base = pcim_iomap_table(pdev); >>>> adapter->pdev = pdev; >>> >> >
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