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Date: Mon, 14 Mar 2022 09:38:25 +0000
From: "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)"
<longpeng2@...wei.com>
To: Jason Wang <jasowang@...hat.com>,
"mst@...hat.com" <mst@...hat.com>,
"sgarzare@...hat.com" <sgarzare@...hat.com>,
"stefanha@...hat.com" <stefanha@...hat.com>
CC: "virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"Gonglei (Arei)" <arei.gonglei@...wei.com>,
Yechuan <yechuan@...wei.com>,
Huangzhichao <huangzhichao@...wei.com>,
"gdawar@...inx.com" <gdawar@...inx.com>
Subject: RE: [PATCH v2 2/2] vdpa: support exposing the count of vqs to
userspace
> -----Original Message-----
> From: Jason Wang [mailto:jasowang@...hat.com]
> Sent: Monday, March 14, 2022 2:04 PM
> To: Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
> <longpeng2@...wei.com>; mst@...hat.com; sgarzare@...hat.com;
> stefanha@...hat.com
> Cc: virtualization@...ts.linux-foundation.org; kvm@...r.kernel.org;
> linux-kernel@...r.kernel.org; netdev@...r.kernel.org; Gonglei (Arei)
> <arei.gonglei@...wei.com>; Yechuan <yechuan@...wei.com>; Huangzhichao
> <huangzhichao@...wei.com>; gdawar@...inx.com
> Subject: Re: [PATCH v2 2/2] vdpa: support exposing the count of vqs to userspace
>
>
> 在 2022/3/10 下午3:20, Longpeng(Mike) 写道:
> > From: Longpeng <longpeng2@...wei.com>
> >
> > - GET_VQS_COUNT: the count of virtqueues that exposed
> >
> > And change vdpa_device.nvqs and vhost_vdpa.nvqs to use u32.
>
>
> Patch looks good, a nit is that we'd better use a separate patch for the
> u32 converting.
>
OK, will do in v3, thanks.
> Thanks
>
>
> >
> > Signed-off-by: Longpeng <longpeng2@...wei.com>
> > ---
> > drivers/vdpa/vdpa.c | 6 +++---
> > drivers/vhost/vdpa.c | 23 +++++++++++++++++++----
> > include/linux/vdpa.h | 6 +++---
> > include/uapi/linux/vhost.h | 3 +++
> > 4 files changed, 28 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> > index 1ea5254..2b75c00 100644
> > --- a/drivers/vdpa/vdpa.c
> > +++ b/drivers/vdpa/vdpa.c
> > @@ -232,7 +232,7 @@ static int vdpa_name_match(struct device *dev, const void
> *data)
> > return (strcmp(dev_name(&vdev->dev), data) == 0);
> > }
> >
> > -static int __vdpa_register_device(struct vdpa_device *vdev, int nvqs)
> > +static int __vdpa_register_device(struct vdpa_device *vdev, u32 nvqs)
> > {
> > struct device *dev;
> >
> > @@ -257,7 +257,7 @@ static int __vdpa_register_device(struct vdpa_device *vdev,
> int nvqs)
> > *
> > * Return: Returns an error when fail to add device to vDPA bus
> > */
> > -int _vdpa_register_device(struct vdpa_device *vdev, int nvqs)
> > +int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs)
> > {
> > if (!vdev->mdev)
> > return -EINVAL;
> > @@ -274,7 +274,7 @@ int _vdpa_register_device(struct vdpa_device *vdev, int
> nvqs)
> > *
> > * Return: Returns an error when fail to add to vDPA bus
> > */
> > -int vdpa_register_device(struct vdpa_device *vdev, int nvqs)
> > +int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs)
> > {
> > int err;
> >
> > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> > index 605c7ae..69b3f05 100644
> > --- a/drivers/vhost/vdpa.c
> > +++ b/drivers/vhost/vdpa.c
> > @@ -42,7 +42,7 @@ struct vhost_vdpa {
> > struct device dev;
> > struct cdev cdev;
> > atomic_t opened;
> > - int nvqs;
> > + u32 nvqs;
> > int virtio_id;
> > int minor;
> > struct eventfd_ctx *config_ctx;
> > @@ -158,7 +158,8 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v,
> u8 __user *statusp)
> > struct vdpa_device *vdpa = v->vdpa;
> > const struct vdpa_config_ops *ops = vdpa->config;
> > u8 status, status_old;
> > - int ret, nvqs = v->nvqs;
> > + u32 nvqs = v->nvqs;
> > + int ret;
> > u16 i;
> >
> > if (copy_from_user(&status, statusp, sizeof(status)))
> > @@ -369,6 +370,16 @@ static long vhost_vdpa_get_config_size(struct vhost_vdpa
> *v, u32 __user *argp)
> > return 0;
> > }
> >
> > +static long vhost_vdpa_get_vqs_count(struct vhost_vdpa *v, u32 __user *argp)
> > +{
> > + struct vdpa_device *vdpa = v->vdpa;
> > +
> > + if (copy_to_user(argp, &vdpa->nvqs, sizeof(vdpa->nvqs)))
> > + return -EFAULT;
> > +
> > + return 0;
> > +}
> > +
> > static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
> > void __user *argp)
> > {
> > @@ -509,6 +520,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
> > case VHOST_VDPA_GET_CONFIG_SIZE:
> > r = vhost_vdpa_get_config_size(v, argp);
> > break;
> > + case VHOST_VDPA_GET_VQS_COUNT:
> > + r = vhost_vdpa_get_vqs_count(v, argp);
> > + break;
> > default:
> > r = vhost_dev_ioctl(&v->vdev, cmd, argp);
> > if (r == -ENOIOCTLCMD)
> > @@ -965,7 +979,8 @@ static int vhost_vdpa_open(struct inode *inode, struct
> file *filep)
> > struct vhost_vdpa *v;
> > struct vhost_dev *dev;
> > struct vhost_virtqueue **vqs;
> > - int nvqs, i, r, opened;
> > + int r, opened;
> > + u32 i, nvqs;
> >
> > v = container_of(inode->i_cdev, struct vhost_vdpa, cdev);
> >
> > @@ -1018,7 +1033,7 @@ static int vhost_vdpa_open(struct inode *inode, struct
> file *filep)
> >
> > static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)
> > {
> > - int i;
> > + u32 i;
> >
> > for (i = 0; i < v->nvqs; i++)
> > vhost_vdpa_unsetup_vq_irq(v, i);
> > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> > index a526919..8943a20 100644
> > --- a/include/linux/vdpa.h
> > +++ b/include/linux/vdpa.h
> > @@ -83,7 +83,7 @@ struct vdpa_device {
> > unsigned int index;
> > bool features_valid;
> > bool use_va;
> > - int nvqs;
> > + u32 nvqs;
> > struct vdpa_mgmt_dev *mdev;
> > };
> >
> > @@ -338,10 +338,10 @@ struct vdpa_device *__vdpa_alloc_device(struct device
> *parent,
> > dev_struct, member)), name, use_va), \
> > dev_struct, member)
> >
> > -int vdpa_register_device(struct vdpa_device *vdev, int nvqs);
> > +int vdpa_register_device(struct vdpa_device *vdev, u32 nvqs);
> > void vdpa_unregister_device(struct vdpa_device *vdev);
> >
> > -int _vdpa_register_device(struct vdpa_device *vdev, int nvqs);
> > +int _vdpa_register_device(struct vdpa_device *vdev, u32 nvqs);
> > void _vdpa_unregister_device(struct vdpa_device *vdev);
> >
> > /**
> > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
> > index bc74e95..5d99e7c 100644
> > --- a/include/uapi/linux/vhost.h
> > +++ b/include/uapi/linux/vhost.h
> > @@ -154,4 +154,7 @@
> > /* Get the config size */
> > #define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32)
> >
> > +/* Get the count of all virtqueues */
> > +#define VHOST_VDPA_GET_VQS_COUNT _IOR(VHOST_VIRTIO, 0x80, __u32)
> > +
> > #endif
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