| Message ID | 20201216064818.48239-13-jasowang@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Control VQ support in vDPA | expand |
On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote: > Follows the vDPA support for multiple address spaces, this patch > introduce uAPI for the userspace to know the number of virtqueue > groups supported by the vDPA device. Can you explain what exactly you mean be userspace? Is it just qemu or is it destined to the virtio_net driver run by the qemu process? Also can you say for what purpose? > > Signed-off-by: Jason Wang <jasowang@redhat.com> > --- > drivers/vhost/vdpa.c | 4 ++++ > include/uapi/linux/vhost.h | 3 +++ > 2 files changed, 7 insertions(+) > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c > index 060d5b5b7e64..1ba5901b28e7 100644 > --- a/drivers/vhost/vdpa.c > +++ b/drivers/vhost/vdpa.c > @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, > case VHOST_VDPA_GET_VRING_NUM: > r = vhost_vdpa_get_vring_num(v, argp); > break; > + case VHOST_VDPA_GET_GROUP_NUM: > + r = copy_to_user(argp, &v->vdpa->ngroups, > + sizeof(v->vdpa->ngroups)); > + break; > case VHOST_SET_LOG_BASE: > case VHOST_SET_LOG_FD: > r = -ENOIOCTLCMD; > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index 59c6c0fbaba1..8a4e6e426bbf 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -145,4 +145,7 @@ > /* Get the valid iova range */ > #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ > struct vhost_vdpa_iova_range) > +/* Get the number of virtqueue groups. */ > +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int) > + > #endif > -- > 2.25.1 >
On 2020/12/29 下午8:24, Eli Cohen wrote: > On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote: >> Follows the vDPA support for multiple address spaces, this patch >> introduce uAPI for the userspace to know the number of virtqueue >> groups supported by the vDPA device. > Can you explain what exactly you mean be userspace? It's the userspace that uses the uAPI introduced in this patch. > Is it just qemu or > is it destined to the virtio_net driver run by the qemu process? It could be Qemu, DPDK or other userspace program. The guest virtio-net driver will not use this but talks to the virtio device emulated by Qemu. > Also can you say for what purpose? This can be used for facilitate the checking of whether the control vq could be supported. E.g if the device support less than 2 groups, qemu won't advertise control vq. Yes, #groups could be inferred from GET_VRING_GROUP. But it's not straightforward as this. Thanks > >> Signed-off-by: Jason Wang <jasowang@redhat.com> >> --- >> drivers/vhost/vdpa.c | 4 ++++ >> include/uapi/linux/vhost.h | 3 +++ >> 2 files changed, 7 insertions(+) >> >> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c >> index 060d5b5b7e64..1ba5901b28e7 100644 >> --- a/drivers/vhost/vdpa.c >> +++ b/drivers/vhost/vdpa.c >> @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, >> case VHOST_VDPA_GET_VRING_NUM: >> r = vhost_vdpa_get_vring_num(v, argp); >> break; >> + case VHOST_VDPA_GET_GROUP_NUM: >> + r = copy_to_user(argp, &v->vdpa->ngroups, >> + sizeof(v->vdpa->ngroups)); >> + break; >> case VHOST_SET_LOG_BASE: >> case VHOST_SET_LOG_FD: >> r = -ENOIOCTLCMD; >> diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h >> index 59c6c0fbaba1..8a4e6e426bbf 100644 >> --- a/include/uapi/linux/vhost.h >> +++ b/include/uapi/linux/vhost.h >> @@ -145,4 +145,7 @@ >> /* Get the valid iova range */ >> #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ >> struct vhost_vdpa_iova_range) >> +/* Get the number of virtqueue groups. */ >> +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int) >> + >> #endif >> -- >> 2.25.1 >>
On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote: > Follows the vDPA support for multiple address spaces, this patch > introduce uAPI for the userspace to know the number of virtqueue > groups supported by the vDPA device. > > Signed-off-by: Jason Wang <jasowang@redhat.com> > --- > drivers/vhost/vdpa.c | 4 ++++ > include/uapi/linux/vhost.h | 3 +++ > 2 files changed, 7 insertions(+) > > diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c > index 060d5b5b7e64..1ba5901b28e7 100644 > --- a/drivers/vhost/vdpa.c > +++ b/drivers/vhost/vdpa.c > @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, > case VHOST_VDPA_GET_VRING_NUM: > r = vhost_vdpa_get_vring_num(v, argp); > break; > + case VHOST_VDPA_GET_GROUP_NUM: > + r = copy_to_user(argp, &v->vdpa->ngroups, > + sizeof(v->vdpa->ngroups)); > + break; Is this and other ioctls already supported in qemu? > case VHOST_SET_LOG_BASE: > case VHOST_SET_LOG_FD: > r = -ENOIOCTLCMD; > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index 59c6c0fbaba1..8a4e6e426bbf 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -145,4 +145,7 @@ > /* Get the valid iova range */ > #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ > struct vhost_vdpa_iova_range) > +/* Get the number of virtqueue groups. */ > +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int) > + > #endif > -- > 2.25.1 >
On 2020/12/30 下午6:05, Eli Cohen wrote: > On Wed, Dec 16, 2020 at 02:48:09PM +0800, Jason Wang wrote: >> Follows the vDPA support for multiple address spaces, this patch >> introduce uAPI for the userspace to know the number of virtqueue >> groups supported by the vDPA device. >> >> Signed-off-by: Jason Wang<jasowang@redhat.com> >> --- >> drivers/vhost/vdpa.c | 4 ++++ >> include/uapi/linux/vhost.h | 3 +++ >> 2 files changed, 7 insertions(+) >> >> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c >> index 060d5b5b7e64..1ba5901b28e7 100644 >> --- a/drivers/vhost/vdpa.c >> +++ b/drivers/vhost/vdpa.c >> @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, >> case VHOST_VDPA_GET_VRING_NUM: >> r = vhost_vdpa_get_vring_num(v, argp); >> break; >> + case VHOST_VDPA_GET_GROUP_NUM: >> + r = copy_to_user(argp, &v->vdpa->ngroups, >> + sizeof(v->vdpa->ngroups)); >> + break; > Is this and other ioctls already supported in qemu? Not yet, the prototype is under development. I test the series with a small and dedicated userspace program. Thanks >
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 060d5b5b7e64..1ba5901b28e7 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -536,6 +536,10 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep, case VHOST_VDPA_GET_VRING_NUM: r = vhost_vdpa_get_vring_num(v, argp); break; + case VHOST_VDPA_GET_GROUP_NUM: + r = copy_to_user(argp, &v->vdpa->ngroups, + sizeof(v->vdpa->ngroups)); + break; case VHOST_SET_LOG_BASE: case VHOST_SET_LOG_FD: r = -ENOIOCTLCMD; diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index 59c6c0fbaba1..8a4e6e426bbf 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -145,4 +145,7 @@ /* Get the valid iova range */ #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \ struct vhost_vdpa_iova_range) +/* Get the number of virtqueue groups. */ +#define VHOST_VDPA_GET_GROUP_NUM _IOR(VHOST_VIRTIO, 0x79, unsigned int) + #endif
Follows the vDPA support for multiple address spaces, this patch introduce uAPI for the userspace to know the number of virtqueue groups supported by the vDPA device. Signed-off-by: Jason Wang <jasowang@redhat.com> --- drivers/vhost/vdpa.c | 4 ++++ include/uapi/linux/vhost.h | 3 +++ 2 files changed, 7 insertions(+)