linux-kernel - Re: [PATCH v8 2/5] hisi_acc_vfio_pci: extract public functions for container

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Date:   Tue, 14 Mar 2023 18:34:00 +0800
From:   liulongfang <liulongfang@...wei.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     <jgg@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
        <jonathan.cameron@...wei.com>, <cohuck@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...neuler.org>
Subject: Re: [PATCH v8 2/5] hisi_acc_vfio_pci: extract public functions for
 container_of

On 2023/3/11 7:40, Alex Williamson wrote:
> On Fri, 17 Feb 2023 16:48:28 +0800
> Longfang Liu <liulongfang@...wei.com> wrote:
> 
>> In the current driver, vdev is obtained from struct
>> hisi_acc_vf_core_device through the container_of function.
>> This method is used in many places in the driver. In order to
>> reduce this repetitive operation, I extracted a public function
>> to replace it.
>>
>> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
>> ---
>>  .../vfio/pci/hisilicon/hisi_acc_vfio_pci.c    | 21 ++++++++++---------
>>  1 file changed, 11 insertions(+), 10 deletions(-)
>>
>> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> index a117eaf21c14..a1589947e721 100644
>> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
>> @@ -630,6 +630,12 @@ static void hisi_acc_vf_disable_fds(struct hisi_acc_vf_core_device *hisi_acc_vde
>>  	}
>>  }
>>  
>> +static struct hisi_acc_vf_core_device *hisi_acc_get_vf_dev(struct vfio_device *vdev)
>> +{
>> +	return container_of(vdev, struct hisi_acc_vf_core_device,
>> +			    core_device.vdev);
>> +}
> 
> This type of function is often named to_foo_bar(), ex. to_pci_dev(),
> and often macros.  Perhaps:
> 
> #define to_hisi_acc_dev(n) container_of(n, \
> 	struct hisi_acc_vf_core_device, core_device,vdev)
>

First of all, thanks for your suggestion, but I want to keep
the current way of complete function declaration.

Thanks,
Longfang.
> Thanks,
> Alex
> 
>> +
>>  /*
>>   * This function is called in all state_mutex unlock cases to
>>   * handle a 'deferred_reset' if exists.
>> @@ -1042,8 +1048,7 @@ static struct file *
>>  hisi_acc_vfio_pci_set_device_state(struct vfio_device *vdev,
>>  				   enum vfio_device_mig_state new_state)
>>  {
>> -	struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(vdev,
>> -			struct hisi_acc_vf_core_device, core_device.vdev);
>> +	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);
>>  	enum vfio_device_mig_state next_state;
>>  	struct file *res = NULL;
>>  	int ret;
>> @@ -1084,8 +1089,7 @@ static int
>>  hisi_acc_vfio_pci_get_device_state(struct vfio_device *vdev,
>>  				   enum vfio_device_mig_state *curr_state)
>>  {
>> -	struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(vdev,
>> -			struct hisi_acc_vf_core_device, core_device.vdev);
>> +	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);
>>  
>>  	mutex_lock(&hisi_acc_vdev->state_mutex);
>>  	*curr_state = hisi_acc_vdev->mig_state;
>> @@ -1301,8 +1305,7 @@ static long hisi_acc_vfio_pci_ioctl(struct vfio_device *core_vdev, unsigned int
>>  
>>  static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev)
>>  {
>> -	struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(core_vdev,
>> -			struct hisi_acc_vf_core_device, core_device.vdev);
>> +	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev);
>>  	struct vfio_pci_core_device *vdev = &hisi_acc_vdev->core_device;
>>  	int ret;
>>  
>> @@ -1325,8 +1328,7 @@ static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev)
>>  
>>  static void hisi_acc_vfio_pci_close_device(struct vfio_device *core_vdev)
>>  {
>> -	struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(core_vdev,
>> -			struct hisi_acc_vf_core_device, core_device.vdev);
>> +	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev);
>>  	struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
>>  
>>  	iounmap(vf_qm->io_base);
>> @@ -1341,8 +1343,7 @@ static const struct vfio_migration_ops hisi_acc_vfio_pci_migrn_state_ops = {
>>  
>>  static int hisi_acc_vfio_pci_migrn_init_dev(struct vfio_device *core_vdev)
>>  {
>> -	struct hisi_acc_vf_core_device *hisi_acc_vdev = container_of(core_vdev,
>> -			struct hisi_acc_vf_core_device, core_device.vdev);
>> +	struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(core_vdev);
>>  	struct pci_dev *pdev = to_pci_dev(core_vdev->dev);
>>  	struct hisi_qm *pf_qm = hisi_acc_get_pf_qm(pdev);
>>  
> 
> .
>