* [PATCH] tools/virtio: fix byteswap logic
@ 2015-11-30 8:33 Michael S. Tsirkin
2015-11-30 9:38 ` Greg Kurz
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Michael S. Tsirkin @ 2015-11-30 8:33 UTC (permalink / raw)
To: linux-kernel; +Cc: virtualization
commit cf561f0d2eb74574ad9985a2feab134267a9d298 ("virtio: introduce
virtio_is_little_endian() helper") changed byteswap logic to
skip feature bit checks for LE platforms, but didn't
update tools/virtio, so vring_bench started failing.
Update the copy under tools/virtio/ (TODO: find a way to avoid this code
duplication).
Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
tools/virtio/linux/virtio_config.h | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
index 806d683..57a6964 100644
--- a/tools/virtio/linux/virtio_config.h
+++ b/tools/virtio/linux/virtio_config.h
@@ -40,33 +40,39 @@ static inline void __virtio_clear_bit(struct virtio_device *vdev,
#define virtio_has_feature(dev, feature) \
(__virtio_test_bit((dev), feature))
+static inline bool virtio_is_little_endian(struct virtio_device *vdev)
+{
+ return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
+ virtio_legacy_is_little_endian();
+}
+
+/* Memory accessors */
static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
{
- return __virtio16_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
{
- return __cpu_to_virtio16(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
}
static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
{
- return __virtio32_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
{
- return __cpu_to_virtio32(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
}
static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
{
- return __virtio64_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
}
static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
{
- return __cpu_to_virtio64(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
+ return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
}
-
--
MST
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] tools/virtio: fix byteswap logic
2015-11-30 8:33 [PATCH] tools/virtio: fix byteswap logic Michael S. Tsirkin
@ 2015-11-30 9:38 ` Greg Kurz
2015-11-30 10:02 ` Cornelia Huck
2015-12-04 19:37 ` Venkatesh Srinivas via Virtualization
2 siblings, 0 replies; 4+ messages in thread
From: Greg Kurz @ 2015-11-30 9:38 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: linux-kernel, virtualization
On Mon, 30 Nov 2015 10:33:34 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:
> commit cf561f0d2eb74574ad9985a2feab134267a9d298 ("virtio: introduce
> virtio_is_little_endian() helper") changed byteswap logic to
> skip feature bit checks for LE platforms, but didn't
> update tools/virtio, so vring_bench started failing.
>
Oops... yet another oversight...
> Update the copy under tools/virtio/ (TODO: find a way to avoid this code
> duplication).
>
> Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
Reviewed-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> tools/virtio/linux/virtio_config.h | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
> index 806d683..57a6964 100644
> --- a/tools/virtio/linux/virtio_config.h
> +++ b/tools/virtio/linux/virtio_config.h
> @@ -40,33 +40,39 @@ static inline void __virtio_clear_bit(struct virtio_device *vdev,
> #define virtio_has_feature(dev, feature) \
> (__virtio_test_bit((dev), feature))
>
> +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
> +{
> + return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
> + virtio_legacy_is_little_endian();
> +}
> +
> +/* Memory accessors */
> static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
> {
> - return __virtio16_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
> {
> - return __cpu_to_virtio16(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
> }
>
> static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
> {
> - return __virtio32_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
> {
> - return __cpu_to_virtio32(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
> }
>
> static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
> {
> - return __virtio64_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
> {
> - return __cpu_to_virtio64(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
> }
> -
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] tools/virtio: fix byteswap logic
2015-11-30 8:33 [PATCH] tools/virtio: fix byteswap logic Michael S. Tsirkin
2015-11-30 9:38 ` Greg Kurz
@ 2015-11-30 10:02 ` Cornelia Huck
2015-12-04 19:37 ` Venkatesh Srinivas via Virtualization
2 siblings, 0 replies; 4+ messages in thread
From: Cornelia Huck @ 2015-11-30 10:02 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: virtualization, linux-kernel
On Mon, 30 Nov 2015 10:33:34 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:
> commit cf561f0d2eb74574ad9985a2feab134267a9d298 ("virtio: introduce
> virtio_is_little_endian() helper") changed byteswap logic to
> skip feature bit checks for LE platforms, but didn't
> update tools/virtio, so vring_bench started failing.
>
> Update the copy under tools/virtio/ (TODO: find a way to avoid this code
> duplication).
Not to mention that it is easy to miss the code duplication...
>
> Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> tools/virtio/linux/virtio_config.h | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] tools/virtio: fix byteswap logic
2015-11-30 8:33 [PATCH] tools/virtio: fix byteswap logic Michael S. Tsirkin
2015-11-30 9:38 ` Greg Kurz
2015-11-30 10:02 ` Cornelia Huck
@ 2015-12-04 19:37 ` Venkatesh Srinivas via Virtualization
2 siblings, 0 replies; 4+ messages in thread
From: Venkatesh Srinivas via Virtualization @ 2015-12-04 19:37 UTC (permalink / raw)
To: Michael S. Tsirkin; +Cc: vsrinivas, linux-kernel, virtualization
On Mon, Nov 30, 2015 at 10:33:34AM +0200, Michael S. Tsirkin wrote:
> commit cf561f0d2eb74574ad9985a2feab134267a9d298 ("virtio: introduce
> virtio_is_little_endian() helper") changed byteswap logic to
> skip feature bit checks for LE platforms, but didn't
> update tools/virtio, so vring_bench started failing.
>
> Update the copy under tools/virtio/ (TODO: find a way to avoid this code
> duplication).
>
> Cc: Greg Kurz <gkurz@linux.vnet.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
> tools/virtio/linux/virtio_config.h | 20 +++++++++++++-------
> 1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
> index 806d683..57a6964 100644
> --- a/tools/virtio/linux/virtio_config.h
> +++ b/tools/virtio/linux/virtio_config.h
> @@ -40,33 +40,39 @@ static inline void __virtio_clear_bit(struct virtio_device *vdev,
> #define virtio_has_feature(dev, feature) \
> (__virtio_test_bit((dev), feature))
>
> +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
> +{
> + return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) ||
> + virtio_legacy_is_little_endian();
> +}
> +
> +/* Memory accessors */
> static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
> {
> - return __virtio16_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio16_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
> {
> - return __cpu_to_virtio16(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio16(virtio_is_little_endian(vdev), val);
> }
>
> static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
> {
> - return __virtio32_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio32_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
> {
> - return __cpu_to_virtio32(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio32(virtio_is_little_endian(vdev), val);
> }
>
> static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
> {
> - return __virtio64_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __virtio64_to_cpu(virtio_is_little_endian(vdev), val);
> }
>
> static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
> {
> - return __cpu_to_virtio64(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
> + return __cpu_to_virtio64(virtio_is_little_endian(vdev), val);
> }
Tested patch with vring-bench. (I did something similar when reviving it).
Tested-by: Venkatesh Srinivas <venkateshs@google.com>
-- vs;
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-11-30 8:33 [PATCH] tools/virtio: fix byteswap logic Michael S. Tsirkin
2015-11-30 9:38 ` Greg Kurz
2015-11-30 10:02 ` Cornelia Huck
2015-12-04 19:37 ` Venkatesh Srinivas via Virtualization
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