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 both MMIO and PCI.
Signed-off-by: Viktor Prutyanov <[email protected]>
---
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 ++++++
8 files changed, 55 insertions(+), 3 deletions(-)
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 3ff746e3f24a..05da5ad7fc93 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);
+ __le32 data = vring_fill_notification_data(vq);
+
+ writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
+
+ return true;
+}
+
+#define VM_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
+ ? vm_notify_with_data : vm_notify)
+
/* Notify all virtqueues on an interrupt. */
static irqreturn_t vm_interrupt(int irq, void *opaque)
{
@@ -397,7 +410,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
/* Create the vring */
vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
- true, true, ctx, vm_notify, callback, name);
+ true, true, ctx, VM_NOTIFY(vdev), callback, name);
if (!vq) {
err = -ENOMEM;
goto error_new_virtqueue;
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index a6c86f916dbd..bf7daad9ce65 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -43,6 +43,16 @@ bool vp_notify(struct virtqueue *vq)
/* we write the queue's selector into the notification register to
* signal the other end */
iowrite16(vq->index, (void __iomem *)vq->priv);
+
+ return true;
+}
+
+bool vp_notify_with_data(struct virtqueue *vq)
+{
+ __le32 data = vring_fill_notification_data(vq);
+
+ iowrite32(data, (void __iomem *)vq->priv);
+
return true;
}
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index 23112d84218f..9a7212dcbb32 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -105,6 +105,7 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
void vp_synchronize_vectors(struct virtio_device *vdev);
/* the notify function used when creating a virt queue */
bool vp_notify(struct virtqueue *vq);
+bool vp_notify_with_data(struct virtqueue *vq);
/* the config->del_vqs() implementation */
void vp_del_vqs(struct virtio_device *vdev);
/* the config->find_vqs() implementation */
@@ -114,6 +115,9 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
struct irq_affinity *desc);
const char *vp_bus_name(struct virtio_device *vdev);
+#define VP_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
+ ? vp_notify : vp_notify_with_data)
+
/* Setup the affinity for a virtqueue:
* - force the affinity for per vq vector
* - OR over all affinities for shared MSI
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index 2257f1b3d8ae..b98e994cae48 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -131,7 +131,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
vq = vring_create_virtqueue(index, num,
VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
true, false, ctx,
- vp_notify, callback, name);
+ VP_NOTIFY(&vp_dev->vdev), callback, name);
if (!vq)
return ERR_PTR(-ENOMEM);
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 9e496e288cfa..7fcd8af5af7e 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -321,7 +321,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
vq = vring_create_virtqueue(index, num,
SMP_CACHE_BYTES, &vp_dev->vdev,
true, true, ctx,
- vp_notify, callback, name);
+ VP_NOTIFY(&vp_dev->vdev), callback, name);
if (!vq)
return ERR_PTR(-ENOMEM);
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 41144b5246a8..8de0800efee7 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2752,6 +2752,21 @@ void vring_del_virtqueue(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(vring_del_virtqueue);
+__le32 vring_fill_notification_data(struct virtqueue *_vq)
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+ u16 next;
+
+ if (vq->packed_ring)
+ next = (vq->packed.next_avail_idx & ~(1 << 15)) |
+ ((u16)vq->packed.avail_wrap_counter << 15);
+ else
+ next = virtio16_to_cpu(_vq->vdev, vq->split.vring.avail->idx);
+
+ return cpu_to_le32(((u32)next << 16) | _vq->index);
+}
+EXPORT_SYMBOL_GPL(vring_fill_notification_data);
+
/* Manipulates transport-specific feature bits. */
void vring_transport_features(struct virtio_device *vdev)
{
@@ -2771,6 +2786,8 @@ void vring_transport_features(struct virtio_device *vdev)
break;
case VIRTIO_F_ORDER_PLATFORM:
break;
+ case VIRTIO_F_NOTIFICATION_DATA:
+ break;
default:
/* We don't understand this bit. */
__virtio_clear_bit(vdev, i);
diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
index 8b95b69ef694..3222324fb244 100644
--- a/include/linux/virtio_ring.h
+++ b/include/linux/virtio_ring.h
@@ -117,4 +117,6 @@ void vring_del_virtqueue(struct virtqueue *vq);
void vring_transport_features(struct virtio_device *vdev);
irqreturn_t vring_interrupt(int irq, void *_vq);
+
+__le32 vring_fill_notification_data(struct virtqueue *_vq);
#endif /* _LINUX_VIRTIO_RING_H */
diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
index 3c05162bc988..2c712c654165 100644
--- a/include/uapi/linux/virtio_config.h
+++ b/include/uapi/linux/virtio_config.h
@@ -99,6 +99,12 @@
*/
#define VIRTIO_F_SR_IOV 37
+/*
+ * This feature indicates that the driver passes extra data (besides
+ * identifying the virtqueue) in its device notifications.
+ */
+#define VIRTIO_F_NOTIFICATION_DATA 38
+
/*
* This feature indicates that the driver can reset a queue individually.
*/
--
2.35.1
On Mon, Mar 20, 2023 at 02:54:51PM +0300, Viktor Prutyanov 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 both MMIO and PCI.
>
> Signed-off-by: Viktor Prutyanov <[email protected]>
> ---
> 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 ++++++
> 8 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 3ff746e3f24a..05da5ad7fc93 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);
> + __le32 data = vring_fill_notification_data(vq);
> +
> + writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
> +
> + return true;
> +}
> +
> +#define VM_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
> + ? vm_notify_with_data : vm_notify)
> +
> /* Notify all virtqueues on an interrupt. */
> static irqreturn_t vm_interrupt(int irq, void *opaque)
> {
> @@ -397,7 +410,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
>
> /* Create the vring */
> vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
> - true, true, ctx, vm_notify, callback, name);
> + true, true, ctx, VM_NOTIFY(vdev), callback, name);
> if (!vq) {
> err = -ENOMEM;
> goto error_new_virtqueue;
> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index a6c86f916dbd..bf7daad9ce65 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -43,6 +43,16 @@ bool vp_notify(struct virtqueue *vq)
> /* we write the queue's selector into the notification register to
> * signal the other end */
> iowrite16(vq->index, (void __iomem *)vq->priv);
> +
> + return true;
> +}
> +
> +bool vp_notify_with_data(struct virtqueue *vq)
> +{
> + __le32 data = vring_fill_notification_data(vq);
> +
> + iowrite32(data, (void __iomem *)vq->priv);
> +
> return true;
> }
>
> diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
> index 23112d84218f..9a7212dcbb32 100644
> --- a/drivers/virtio/virtio_pci_common.h
> +++ b/drivers/virtio/virtio_pci_common.h
> @@ -105,6 +105,7 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
> void vp_synchronize_vectors(struct virtio_device *vdev);
> /* the notify function used when creating a virt queue */
> bool vp_notify(struct virtqueue *vq);
> +bool vp_notify_with_data(struct virtqueue *vq);
> /* the config->del_vqs() implementation */
> void vp_del_vqs(struct virtio_device *vdev);
> /* the config->find_vqs() implementation */
> @@ -114,6 +115,9 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
> struct irq_affinity *desc);
> const char *vp_bus_name(struct virtio_device *vdev);
>
> +#define VP_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
> + ? vp_notify : vp_notify_with_data)
> +
> /* Setup the affinity for a virtqueue:
> * - force the affinity for per vq vector
> * - OR over all affinities for shared MSI
> diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
> index 2257f1b3d8ae..b98e994cae48 100644
> --- a/drivers/virtio/virtio_pci_legacy.c
> +++ b/drivers/virtio/virtio_pci_legacy.c
> @@ -131,7 +131,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> vq = vring_create_virtqueue(index, num,
> VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
> true, false, ctx,
> - vp_notify, callback, name);
> + VP_NOTIFY(&vp_dev->vdev), callback, name);
> if (!vq)
> return ERR_PTR(-ENOMEM);
>
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index 9e496e288cfa..7fcd8af5af7e 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -321,7 +321,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> vq = vring_create_virtqueue(index, num,
> SMP_CACHE_BYTES, &vp_dev->vdev,
> true, true, ctx,
> - vp_notify, callback, name);
> + VP_NOTIFY(&vp_dev->vdev), callback, name);
> if (!vq)
> return ERR_PTR(-ENOMEM);
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 41144b5246a8..8de0800efee7 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2752,6 +2752,21 @@ void vring_del_virtqueue(struct virtqueue *_vq)
> }
> EXPORT_SYMBOL_GPL(vring_del_virtqueue);
>
> +__le32 vring_fill_notification_data(struct virtqueue *_vq)
> +{
> + struct vring_virtqueue *vq = to_vvq(_vq);
> + u16 next;
> +
> + if (vq->packed_ring)
> + next = (vq->packed.next_avail_idx & ~(1 << 15)) |
> + ((u16)vq->packed.avail_wrap_counter << 15);
> + else
> + next = virtio16_to_cpu(_vq->vdev, vq->split.vring.avail->idx);
> +
> + return cpu_to_le32(((u32)next << 16) | _vq->index);
> +}
> +EXPORT_SYMBOL_GPL(vring_fill_notification_data);
> +
> /* Manipulates transport-specific feature bits. */
> void vring_transport_features(struct virtio_device *vdev)
> {
> @@ -2771,6 +2786,8 @@ void vring_transport_features(struct virtio_device *vdev)
> break;
> case VIRTIO_F_ORDER_PLATFORM:
> break;
> + case VIRTIO_F_NOTIFICATION_DATA:
> + break;
> default:
> /* We don't understand this bit. */
> __virtio_clear_bit(vdev, i);
Looks like you are adding this to all transports.
In that case you have to actually patch all transports
not just mmio and pci.
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index 8b95b69ef694..3222324fb244 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -117,4 +117,6 @@ void vring_del_virtqueue(struct virtqueue *vq);
> void vring_transport_features(struct virtio_device *vdev);
>
> irqreturn_t vring_interrupt(int irq, void *_vq);
> +
> +__le32 vring_fill_notification_data(struct virtqueue *_vq);
> #endif /* _LINUX_VIRTIO_RING_H */
> diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
> index 3c05162bc988..2c712c654165 100644
> --- a/include/uapi/linux/virtio_config.h
> +++ b/include/uapi/linux/virtio_config.h
> @@ -99,6 +99,12 @@
> */
> #define VIRTIO_F_SR_IOV 37
>
> +/*
> + * This feature indicates that the driver passes extra data (besides
> + * identifying the virtqueue) in its device notifications.
> + */
> +#define VIRTIO_F_NOTIFICATION_DATA 38
> +
> /*
> * This feature indicates that the driver can reset a queue individually.
> */
> --
> 2.35.1
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: nios2-randconfig-s051-20230319 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: nios2-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=nios2 SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_mmio.c:293:16: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] value @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_mmio.c:293:16: sparse: expected unsigned int [usertype] value
drivers/virtio/virtio_mmio.c:293:16: sparse: got restricted __le32 [usertype] data
vim +293 drivers/virtio/virtio_mmio.c
287
288 static bool vm_notify_with_data(struct virtqueue *vq)
289 {
290 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
291 __le32 data = vring_fill_notification_data(vq);
292
> 293 writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
294
295 return true;
296 }
297
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: i386-randconfig-s003 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 olddefconfig
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_mmio.c:293:16: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int val @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_mmio.c:293:16: sparse: expected unsigned int val
drivers/virtio/virtio_mmio.c:293:16: sparse: got restricted __le32 [usertype] data
vim +293 drivers/virtio/virtio_mmio.c
287
288 static bool vm_notify_with_data(struct virtqueue *vq)
289 {
290 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
291 __le32 data = vring_fill_notification_data(vq);
292
> 293 writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
294
295 return true;
296 }
297
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: sparc64-randconfig-s052-20230319 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_mmio.c:293:16: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] l @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_mmio.c:293:16: sparse: expected unsigned int [usertype] l
drivers/virtio/virtio_mmio.c:293:16: sparse: got restricted __le32 [usertype] data
vim +293 drivers/virtio/virtio_mmio.c
287
288 static bool vm_notify_with_data(struct virtqueue *vq)
289 {
290 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
291 __le32 data = vring_fill_notification_data(vq);
292
> 293 writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
294
295 return true;
296 }
297
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: loongarch-randconfig-s032-20230319 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: loongarch64-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=loongarch olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_pci_common.c:54:19: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] value @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_pci_common.c:54:19: sparse: expected unsigned int [usertype] value
drivers/virtio/virtio_pci_common.c:54:19: sparse: got restricted __le32 [usertype] data
vim +54 drivers/virtio/virtio_pci_common.c
49
50 bool vp_notify_with_data(struct virtqueue *vq)
51 {
52 __le32 data = vring_fill_notification_data(vq);
53
> 54 iowrite32(data, (void __iomem *)vq->priv);
55
56 return true;
57 }
58
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 olddefconfig
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/virtio/ net/bluetooth/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_pci_common.c:54:19: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_pci_common.c:54:19: sparse: expected unsigned int [usertype]
drivers/virtio/virtio_pci_common.c:54:19: sparse: got restricted __le32 [usertype] data
vim +54 drivers/virtio/virtio_pci_common.c
49
50 bool vp_notify_with_data(struct virtqueue *vq)
51 {
52 __le32 data = vring_fill_notification_data(vq);
53
> 54 iowrite32(data, (void __iomem *)vq->priv);
55
56 return true;
57 }
58
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: alpha-randconfig-s043-20230319 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: alpha-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=alpha SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_mmio.c:293:16: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] b @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_mmio.c:293:16: sparse: expected unsigned int [usertype] b
drivers/virtio/virtio_mmio.c:293:16: sparse: got restricted __le32 [usertype] data
vim +293 drivers/virtio/virtio_mmio.c
287
288 static bool vm_notify_with_data(struct virtqueue *vq)
289 {
290 struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
291 __le32 data = vring_fill_notification_data(vq);
292
> 293 writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
294
295 return true;
296 }
297
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
Hi Viktor,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on mst-vhost/linux-next]
[also build test WARNING on linus/master v6.3-rc3 next-20230320]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next
patch link: https://lore.kernel.org/r/20230320115451.1232171-1-viktor%40daynix.com
patch subject: [PATCH] virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
config: sparc64-randconfig-s031-20230319 (https://download.01.org/0day-ci/archive/20230321/[email protected]/config)
compiler: sparc64-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/b6212a12ca1691dc346e5de046ec46bd3ce11247
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Viktor-Prutyanov/virtio-add-VIRTIO_F_NOTIFICATION_DATA-feature-support/20230320-195725
git checkout b6212a12ca1691dc346e5de046ec46bd3ce11247
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=sparc64 SHELL=/bin/bash drivers/virtio/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <[email protected]>
| Link: https://lore.kernel.org/oe-kbuild-all/[email protected]/
sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_pci_common.c:54:19: sparse: sparse: incorrect type in argument 1 (different base types) @@ expected unsigned int [usertype] l @@ got restricted __le32 [usertype] data @@
drivers/virtio/virtio_pci_common.c:54:19: sparse: expected unsigned int [usertype] l
drivers/virtio/virtio_pci_common.c:54:19: sparse: got restricted __le32 [usertype] data
vim +54 drivers/virtio/virtio_pci_common.c
49
50 bool vp_notify_with_data(struct virtqueue *vq)
51 {
52 __le32 data = vring_fill_notification_data(vq);
53
> 54 iowrite32(data, (void __iomem *)vq->priv);
55
56 return true;
57 }
58
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
On Mon, 20 Mar 2023 14:54:51 +0300, Viktor Prutyanov <[email protected]> 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 both MMIO and PCI.
>
> Signed-off-by: Viktor Prutyanov <[email protected]>
> ---
> 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 ++++++
> 8 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 3ff746e3f24a..05da5ad7fc93 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);
> + __le32 data = vring_fill_notification_data(vq);
> +
> + writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
> +
> + return true;
> +}
> +
> +#define VM_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
> + ? vm_notify_with_data : vm_notify)
Is this macro necessary, it is only used once. And I don't recognize that this
logic is necessary to use macro.
> +
> /* Notify all virtqueues on an interrupt. */
> static irqreturn_t vm_interrupt(int irq, void *opaque)
> {
> @@ -397,7 +410,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in
>
> /* Create the vring */
> vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev,
> - true, true, ctx, vm_notify, callback, name);
> + true, true, ctx, VM_NOTIFY(vdev), callback, name);
> if (!vq) {
> err = -ENOMEM;
> goto error_new_virtqueue;
> diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
> index a6c86f916dbd..bf7daad9ce65 100644
> --- a/drivers/virtio/virtio_pci_common.c
> +++ b/drivers/virtio/virtio_pci_common.c
> @@ -43,6 +43,16 @@ bool vp_notify(struct virtqueue *vq)
> /* we write the queue's selector into the notification register to
> * signal the other end */
> iowrite16(vq->index, (void __iomem *)vq->priv);
> +
> + return true;
> +}
> +
> +bool vp_notify_with_data(struct virtqueue *vq)
> +{
> + __le32 data = vring_fill_notification_data(vq);
> +
> + iowrite32(data, (void __iomem *)vq->priv);
> +
> return true;
> }
>
> diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
> index 23112d84218f..9a7212dcbb32 100644
> --- a/drivers/virtio/virtio_pci_common.h
> +++ b/drivers/virtio/virtio_pci_common.h
> @@ -105,6 +105,7 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
> void vp_synchronize_vectors(struct virtio_device *vdev);
> /* the notify function used when creating a virt queue */
> bool vp_notify(struct virtqueue *vq);
> +bool vp_notify_with_data(struct virtqueue *vq);
> /* the config->del_vqs() implementation */
> void vp_del_vqs(struct virtio_device *vdev);
> /* the config->find_vqs() implementation */
> @@ -114,6 +115,9 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
> struct irq_affinity *desc);
> const char *vp_bus_name(struct virtio_device *vdev);
>
> +#define VP_NOTIFY(vdev) (__virtio_test_bit((vdev), VIRTIO_F_NOTIFICATION_DATA) \
> + ? vp_notify : vp_notify_with_data)
> +
I also think that this is not necessary, although it has been used twice.
> /* Setup the affinity for a virtqueue:
> * - force the affinity for per vq vector
> * - OR over all affinities for shared MSI
> diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
> index 2257f1b3d8ae..b98e994cae48 100644
> --- a/drivers/virtio/virtio_pci_legacy.c
> +++ b/drivers/virtio/virtio_pci_legacy.c
> @@ -131,7 +131,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> vq = vring_create_virtqueue(index, num,
> VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
> true, false, ctx,
> - vp_notify, callback, name);
> + VP_NOTIFY(&vp_dev->vdev), callback, name);
> if (!vq)
> return ERR_PTR(-ENOMEM);
>
> diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
> index 9e496e288cfa..7fcd8af5af7e 100644
> --- a/drivers/virtio/virtio_pci_modern.c
> +++ b/drivers/virtio/virtio_pci_modern.c
> @@ -321,7 +321,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
> vq = vring_create_virtqueue(index, num,
> SMP_CACHE_BYTES, &vp_dev->vdev,
> true, true, ctx,
> - vp_notify, callback, name);
> + VP_NOTIFY(&vp_dev->vdev), callback, name);
> if (!vq)
> return ERR_PTR(-ENOMEM);
>
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 41144b5246a8..8de0800efee7 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -2752,6 +2752,21 @@ void vring_del_virtqueue(struct virtqueue *_vq)
> }
> EXPORT_SYMBOL_GPL(vring_del_virtqueue);
>
> +__le32 vring_fill_notification_data(struct virtqueue *_vq)
> +{
> + struct vring_virtqueue *vq = to_vvq(_vq);
> + u16 next;
> +
> + if (vq->packed_ring)
> + next = (vq->packed.next_avail_idx & ~(1 << 15)) |
> + ((u16)vq->packed.avail_wrap_counter << 15);
> + else
> + next = virtio16_to_cpu(_vq->vdev, vq->split.vring.avail->idx);
> +
> + return cpu_to_le32(((u32)next << 16) | _vq->index);
> +}
> +EXPORT_SYMBOL_GPL(vring_fill_notification_data);
> +
> /* Manipulates transport-specific feature bits. */
> void vring_transport_features(struct virtio_device *vdev)
> {
> @@ -2771,6 +2786,8 @@ void vring_transport_features(struct virtio_device *vdev)
> break;
> case VIRTIO_F_ORDER_PLATFORM:
> break;
> + case VIRTIO_F_NOTIFICATION_DATA:
> + break;
> default:
> /* We don't understand this bit. */
> __virtio_clear_bit(vdev, i);
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index 8b95b69ef694..3222324fb244 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -117,4 +117,6 @@ void vring_del_virtqueue(struct virtqueue *vq);
> void vring_transport_features(struct virtio_device *vdev);
>
> irqreturn_t vring_interrupt(int irq, void *_vq);
> +
> +__le32 vring_fill_notification_data(struct virtqueue *_vq);
> #endif /* _LINUX_VIRTIO_RING_H */
> diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h
> index 3c05162bc988..2c712c654165 100644
> --- a/include/uapi/linux/virtio_config.h
> +++ b/include/uapi/linux/virtio_config.h
> @@ -99,6 +99,12 @@
> */
> #define VIRTIO_F_SR_IOV 37
>
> +/*
> + * This feature indicates that the driver passes extra data (besides
> + * identifying the virtqueue) in its device notifications.
> + */
> +#define VIRTIO_F_NOTIFICATION_DATA 38
> +
Although this patch is not large, I think it can be split:
* add VIRTIO_F_NOTIFICATION_DATA
* pci support
* mmio support
This is beneficial to backport.
Thanks.
> /*
> * This feature indicates that the driver can reset a queue individually.
> */
> --
> 2.35.1
>
>