lkml.org 
[lkml]   [2015]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] tools/virtio: fix byteswap logic
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);
> }
> -



\
 
 \ /
  Last update: 2015-11-30 11:01    [W:0.079 / U:0.700 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site