RE: [PATCH v2 2/3] Drivers: hv: vmbus: Enable VMBus protocol versions 4.1, 5.1 and 5.2

[Michael Kelley <mikelley@microsoft.com>]

From: Andrea Parri <parri.andrea@gmail.com> Sent: Thursday, October 10, 2019 8:46 AM
> 
> Hyper-V has added VMBus protocol versions 5.1 and 5.2 in recent release
> versions.  Allow Linux guests to negotiate these new protocol versions
> on versions of Hyper-V that support them.  While on this, also allow
> guests to negotiate the VMBus protocol version 4.1 (which was missing).
> 
> Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
> ---
>  drivers/hv/connection.c          | 15 +++++++++------
>  drivers/net/hyperv/netvsc.c      |  6 +++---
>  include/linux/hyperv.h           |  8 +++++++-
>  net/vmw_vsock/hyperv_transport.c |  4 ++--
>  4 files changed, 21 insertions(+), 12 deletions(-)
> 
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index c08b62dbd151f..a4f80e30b0207 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -182,15 +182,21 @@ static inline u32 hv_get_avail_to_write_percent(
>   * 2 . 4  (Windows 8)
>   * 3 . 0  (Windows 8 R2)
>   * 4 . 0  (Windows 10)
> + * 4 . 1  (Windows 10 RS3)
>   * 5 . 0  (Newer Windows 10)
> + * 5 . 1  (Windows 10 RS4)
> + * 5 . 2  (Windows Server 2019, RS5)
>   */
> 
>  #define VERSION_WS2008  ((0 << 16) | (13))
>  #define VERSION_WIN7    ((1 << 16) | (1))
>  #define VERSION_WIN8    ((2 << 16) | (4))
>  #define VERSION_WIN8_1    ((3 << 16) | (0))
> -#define VERSION_WIN10	((4 << 16) | (0))
> +#define VERSION_WIN10_V4 ((4 << 16) | (0))

I would recommend not changing the symbol name for version 4.0.
The change makes it more consistent with the later VERSION_WIN10_*
symbols, but it doesn't fundamentally add any clarity and I'm not sure
it's worth the churn in the other files that have to be touched. It's a
judgment call, and that's just my input.

> +#define VERSION_WIN10_V4_1 ((4 << 16) | (1))
>  #define VERSION_WIN10_V5 ((5 << 16) | (0))
> +#define VERSION_WIN10_V5_1 ((5 << 16) | (1))
> +#define VERSION_WIN10_V5_2 ((5 << 16) | (2))
> 

Michael