netdev - Re: [PATCH 1/3] vDPA/ifcvf: deduce VIRTIO device ID when probe

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Message-ID: <ccf7001b-27f0-27ea-40d2-52ca3cc2386b@linux.intel.com>
Date:   Thu, 15 Apr 2021 13:52:25 +0800
From:   Zhu Lingshan <lingshan.zhu@...ux.intel.com>
To:     Jason Wang <jasowang@...hat.com>,
        Zhu Lingshan <lingshan.zhu@...el.com>, mst@...hat.com,
        lulu@...hat.com, leonro@...dia.com
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] vDPA/ifcvf: deduce VIRTIO device ID when probe



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@...el.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;
>