[PATCH v5 1/8] virtio: introduce virtio_is_little_endian() helper

2015-04-23 Thread Greg Kurz 
Signed-off-by: Greg Kurz gk...@linux.vnet.ibm.com
---
 include/linux/virtio_config.h |   17 +++--
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index ca3ed78..bd1a582 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
return 0;
 }
 
+static inline bool virtio_is_little_endian(struct virtio_device *vdev)
+{
+   return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
+}
+
 /* 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);
 }
 
 /* Config space accessors. */

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Re: [PATCH v5 1/8] virtio: introduce virtio_is_little_endian() helper

2015-04-23 Thread Thomas Huth 
Am Thu, 23 Apr 2015 17:26:20 +0200
schrieb Greg Kurz gk...@linux.vnet.ibm.com:

 Signed-off-by: Greg Kurz gk...@linux.vnet.ibm.com
 ---
  include/linux/virtio_config.h |   17 +++--
  1 file changed, 11 insertions(+), 6 deletions(-)
 
 diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
 index ca3ed78..bd1a582 100644
 --- a/include/linux/virtio_config.h
 +++ b/include/linux/virtio_config.h
 @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int 
 cpu)
   return 0;
  }
  
 +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
 +{
 + return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
 +}

So this function returns false when _not_ using version 1, but running
on a little endian host + guest? Sounds confusing. Maybe you could name
it virtio_is_v1() or so instead?

 Thomas
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Re: [PATCH v5 1/8] virtio: introduce virtio_is_little_endian() helper

2015-04-23 Thread Thomas Huth 
Am Thu, 23 Apr 2015 19:22:15 +0200
schrieb Thomas Huth th...@redhat.com:

 Am Thu, 23 Apr 2015 17:26:20 +0200
 schrieb Greg Kurz gk...@linux.vnet.ibm.com:
 
  Signed-off-by: Greg Kurz gk...@linux.vnet.ibm.com
  ---
   include/linux/virtio_config.h |   17 +++--
   1 file changed, 11 insertions(+), 6 deletions(-)
  
  diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
  index ca3ed78..bd1a582 100644
  --- a/include/linux/virtio_config.h
  +++ b/include/linux/virtio_config.h
  @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int 
  cpu)
  return 0;
   }
   
  +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
  +{
  +   return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
  +}
 
 So this function returns false when _not_ using version 1, but running
 on a little endian host + guest? Sounds confusing. Maybe you could name
 it virtio_is_v1() or so instead?

Ah, never mind, I should have looked at patch 6 first, then it makes
sense. (maybe you could put a note to the later patch in this patch
description?)

 Thomas
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Re: [PATCH v5 1/8] virtio: introduce virtio_is_little_endian() helper

2015-04-23 Thread Thomas Huth 
On Thu, 23 Apr 2015 17:26:20 +0200
Greg Kurz gk...@linux.vnet.ibm.com wrote:

 Signed-off-by: Greg Kurz gk...@linux.vnet.ibm.com
 ---
  include/linux/virtio_config.h |   17 +++--
  1 file changed, 11 insertions(+), 6 deletions(-)
 
 diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
 index ca3ed78..bd1a582 100644
 --- a/include/linux/virtio_config.h
 +++ b/include/linux/virtio_config.h
 @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int 
 cpu)
   return 0;
  }
  
 +static inline bool virtio_is_little_endian(struct virtio_device *vdev)
 +{
 + return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
 +}
 +
  /* 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);
  }

Reviewed-by: Thomas Huth th...@redhat.com
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