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

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Date:   Fri, 10 Mar 2023 16:40:10 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Longfang Liu <liulongfang@...wei.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 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)

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);
>