Re: [dpdk-dev] [PATCH v5] windows/netuio: add Windows NetUIO kernel driver

[Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>]

On Thu,  1 Oct 2020 15:55:08 -0700, Narcisa Ana Maria Vasile wrote:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> The Windows netuio kernel driver provides the DPDK userspace application
> with direct access to hardware, by mapping the HW registers in userspace
> and allowing read/write operations from/to the device
> configuration space.
> 
> Two IOCTLs are defined by the netuio interface:
>   * IOCTL_NETUIO_MAP_HW_INTO_USERSPACE
>       - used for mapping the device registers into userspace
>   * IOCTL_NETUIO_PCI_CONFIG_IO
>       - used to read/write from/into the device configuration space
> 
> Note:
> Requests to map the device BARs into userspace need to be processed
> in the thread context of the process that initiated the mapping request.
> Otherwise, the BARs might end up mapped into an arbitrary process
> address space.
> EvtIoInCallerContext is used to ensure the requests are handled
> in the right user thread context. Other requests (PCI config)
> are sent back to the framework and processed by the EvtIoDeviceControl
> callback.
> 
> Cc: Harini Ramakrishnan <Harini.Ramakrishnan@microsoft.com>
> Cc: Omar Cardona <ocardona@microsoft.com>
> Cc: Dmitry Malloy <dmitrym@microsoft.com>
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>

Reviewed-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>