Messages in this thread | | | From | Jason Wang <> | Date | Tue, 21 Mar 2023 10:29:11 +0800 | Subject | Re: [PATCH v2] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support |
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On Tue, Mar 21, 2023 at 7:21 AM Viktor Prutyanov <viktor@daynix.com> wrote: > > According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature > indicates that the driver passes extra data along with the queue > notifications. > > In a split queue case, the extra data is 16-bit available index. In a > packed queue case, the extra data is 1-bit wrap counter and 15-bit > available index. > > Add support for this feature for MMIO and PCI transports. Channel I/O > transport will not accept this feature. > > Signed-off-by: Viktor Prutyanov <viktor@daynix.com> > --- > > v2: reject the feature in virtio_ccw, replace __le32 with u32 > > drivers/s390/virtio/virtio_ccw.c | 4 +--- > drivers/virtio/virtio_mmio.c | 15 ++++++++++++++- > drivers/virtio/virtio_pci_common.c | 10 ++++++++++ > drivers/virtio/virtio_pci_common.h | 4 ++++ > drivers/virtio/virtio_pci_legacy.c | 2 +- > drivers/virtio/virtio_pci_modern.c | 2 +- > drivers/virtio/virtio_ring.c | 17 +++++++++++++++++ > include/linux/virtio_ring.h | 2 ++ > include/uapi/linux/virtio_config.h | 6 ++++++ > 9 files changed, 56 insertions(+), 6 deletions(-) > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c > index a10dbe632ef9..d72a59415527 100644 > --- a/drivers/s390/virtio/virtio_ccw.c > +++ b/drivers/s390/virtio/virtio_ccw.c > @@ -789,9 +789,7 @@ static u64 virtio_ccw_get_features(struct virtio_device *vdev) > > static void ccw_transport_features(struct virtio_device *vdev) > { > - /* > - * Currently nothing to do here. > - */ > + __virtio_clear_bit(vdev, VIRTIO_F_NOTIFICATION_DATA);
Is there any restriction that prevents us from implementing VIRTIO_F_NOTIFICATION_DATA? (Spec seems doesn't limit us from this)
> } > > static int virtio_ccw_finalize_features(struct virtio_device *vdev) > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c > index 3ff746e3f24a..0e13da17fe0a 100644 > --- a/drivers/virtio/virtio_mmio.c > +++ b/drivers/virtio/virtio_mmio.c > @@ -285,6 +285,19 @@ static bool vm_notify(struct virtqueue *vq) > return true; > } > > +static bool vm_notify_with_data(struct virtqueue *vq) > +{ > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); > + u32 data = vring_fill_notification_data(vq);
Can we move this to the initialization?
Thanks
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