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 13:52:25 +0800 |
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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. 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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