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 at linux.vnet.ibm.com>
> Signed-off-by: Michael S. Tsirkin <mst at 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 at google.com>
-- vs;
