netdev - Re: [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

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Date:   Fri, 24 Mar 2023 17:26:40 -0700
From:   Shannon Nelson <shannon.nelson@....com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        brett.creeley@....com, davem@...emloft.net, netdev@...r.kernel.org,
        kuba@...nel.org, drivers@...sando.io
Subject: Re: [PATCH v3 virtio 4/8] pds_vdpa: virtio bar setup for vdpa

On 3/22/23 10:11 PM, Jason Wang wrote:
> On Thu, Mar 23, 2023 at 3:11 AM Shannon Nelson <shannon.nelson@....com> wrote:
>>
>> Prep and use the "modern" virtio bar utilities to get our
>> virtio config space ready.
>>
>> Signed-off-by: Shannon Nelson <shannon.nelson@....com>
>> ---
>>   drivers/vdpa/pds/aux_drv.c | 25 +++++++++++++++++++++++++
>>   drivers/vdpa/pds/aux_drv.h |  3 +++
>>   2 files changed, 28 insertions(+)
>>
>> diff --git a/drivers/vdpa/pds/aux_drv.c b/drivers/vdpa/pds/aux_drv.c
>> index 881acd869a9d..8f3ae3326885 100644
>> --- a/drivers/vdpa/pds/aux_drv.c
>> +++ b/drivers/vdpa/pds/aux_drv.c
>> @@ -4,6 +4,7 @@
>>   #include <linux/auxiliary_bus.h>
>>   #include <linux/pci.h>
>>   #include <linux/vdpa.h>
>> +#include <linux/virtio_pci_modern.h>
>>
>>   #include <linux/pds/pds_common.h>
>>   #include <linux/pds/pds_core_if.h>
>> @@ -20,12 +21,22 @@ static const struct auxiliary_device_id pds_vdpa_id_table[] = {
>>          {},
>>   };
>>
>> +static int pds_vdpa_device_id_check(struct pci_dev *pdev)
>> +{
>> +       if (pdev->device != PCI_DEVICE_ID_PENSANDO_VDPA_VF ||
>> +           pdev->vendor != PCI_VENDOR_ID_PENSANDO)
>> +               return -ENODEV;
> 
> Similar to patch 1, if we don't need to override we probably can
> rename the device_id_check_override to device_id_check(). Otherwise
> it's better to let this function to return device id.

Sure, I'll tweak this.
sln


> 
> Thanks
> 
>> +
>> +       return 0;
>> +}
>> +
>>   static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
>>                            const struct auxiliary_device_id *id)
>>
>>   {
>>          struct pds_auxiliary_dev *padev =
>>                  container_of(aux_dev, struct pds_auxiliary_dev, aux_dev);
>> +       struct device *dev = &aux_dev->dev;
>>          struct pds_vdpa_aux *vdpa_aux;
>>          int err;
>>
>> @@ -42,8 +53,21 @@ static int pds_vdpa_probe(struct auxiliary_device *aux_dev,
>>          if (err)
>>                  goto err_free_mem;
>>
>> +       /* Find the virtio configuration */
>> +       vdpa_aux->vd_mdev.pci_dev = padev->vf_pdev;
>> +       vdpa_aux->vd_mdev.device_id_check_override = pds_vdpa_device_id_check;
>> +       vdpa_aux->vd_mdev.dma_mask_override = DMA_BIT_MASK(PDS_CORE_ADDR_LEN);
>> +       err = vp_modern_probe(&vdpa_aux->vd_mdev);
>> +       if (err) {
>> +               dev_err(dev, "Unable to probe for virtio configuration: %pe\n",
>> +                       ERR_PTR(err));
>> +               goto err_free_mgmt_info;
>> +       }
>> +
>>          return 0;
>>
>> +err_free_mgmt_info:
>> +       pci_free_irq_vectors(padev->vf_pdev);
>>   err_free_mem:
>>          kfree(vdpa_aux);
>>          auxiliary_set_drvdata(aux_dev, NULL);
>> @@ -56,6 +80,7 @@ static void pds_vdpa_remove(struct auxiliary_device *aux_dev)
>>          struct pds_vdpa_aux *vdpa_aux = auxiliary_get_drvdata(aux_dev);
>>          struct device *dev = &aux_dev->dev;
>>
>> +       vp_modern_remove(&vdpa_aux->vd_mdev);
>>          pci_free_irq_vectors(vdpa_aux->padev->vf_pdev);
>>
>>          kfree(vdpa_aux);
>> diff --git a/drivers/vdpa/pds/aux_drv.h b/drivers/vdpa/pds/aux_drv.h
>> index 94ba7abcaa43..8f5140401573 100644
>> --- a/drivers/vdpa/pds/aux_drv.h
>> +++ b/drivers/vdpa/pds/aux_drv.h
>> @@ -4,6 +4,8 @@
>>   #ifndef _AUX_DRV_H_
>>   #define _AUX_DRV_H_
>>
>> +#include <linux/virtio_pci_modern.h>
>> +
>>   #define PDS_VDPA_DRV_DESCRIPTION    "AMD/Pensando vDPA VF Device Driver"
>>   #define PDS_VDPA_DRV_NAME           "pds_vdpa"
>>
>> @@ -16,6 +18,7 @@ struct pds_vdpa_aux {
>>
>>          int vf_id;
>>          struct dentry *dentry;
>> +       struct virtio_pci_modern_device vd_mdev;
>>
>>          int nintrs;
>>   };
>> --
>> 2.17.1
>>
>