Re: [Xen-devel] [PATCH 2/3] Introduce the Xen 9pfs transport header

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Mar 14, 2017 at 03:18:35PM -0700, Stefano Stabellini wrote:
> Define the ring according to the protocol specification, using the new
> DEFINE_XEN_FLEX_RING_AND_INTF macro.
> 

There is a bit of 9pfs code being posted. Is this patch still
up-to-date with that? I am going to assume yes, in which case
see below


> Signed-off-by: Stefano Stabellini <stefano@xxxxxxxxxxx>
> CC: konrad.wilk@xxxxxxxxxx
> ---
>  xen/include/public/io/9pfs.h | 42 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
>  create mode 100644 xen/include/public/io/9pfs.h
> 
> diff --git a/xen/include/public/io/9pfs.h b/xen/include/public/io/9pfs.h
> new file mode 100644
> index 0000000..b38ee66
> --- /dev/null
> +++ b/xen/include/public/io/9pfs.h
> @@ -0,0 +1,42 @@
> +/*
> + * 9pfs.h -- Xen 9PFS transport
> + *
> + * Refer to docs/misc/9pfs.markdown for the specification
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a 
> copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, 
> and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
> THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (C) 2017 Stefano Stabellini <stefano@xxxxxxxxxxx>
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_9PFS_H__
> +#define __XEN_PUBLIC_IO_9PFS_H__
> +
> +#include "ring.h"
> +
> +struct xen_9pfs_header {
> +     uint32_t size;
> +     uint8_t id;
> +     uint16_t tag;
> +} __attribute__((packed));

I think the Xen headers are not to have __packed__ on the them.
Perhaps you can make this work by using #pragma?

> +
> +#define XEN_9PFS_RING_ORDER 6


Perhaps a bit details? The specs mentions the max and min but .. this
6 value is rather arbitrary?

> +#define XEN_9PFS_RING_SIZE  XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
> +DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
> +
> +#endif

Pls add the bottom of the patch the editor configuration block.

> -- 
> 1.9.1
> 

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