Re: [Xen-devel] [PATCH RFC 12/12] xen-block: implement indirect descriptors

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 28.02.13 at 11:28, Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
> @@ -109,6 +111,16 @@ typedef uint64_t blkif_sector_t;
>   */
>  #define BLKIF_MAX_SEGMENTS_PER_REQUEST 11
>  
> +#define BLKIF_MAX_INDIRECT_GREFS_PER_REQUEST 8
> +
> +struct blkif_request_segment_aligned {
> +     grant_ref_t gref;        /* reference to I/O buffer frame        */
> +     /* @first_sect: first sector in frame to transfer (inclusive).   */
> +     /* @last_sect: last sector in frame to transfer (inclusive).     */
> +     uint8_t     first_sect, last_sect;
> +     uint16_t    _pad; /* padding to make it 8 bytes, so it's cache-aligned 
> */
> +} __attribute__((__packed__));

What's the __packed__ for here?

> +
>  struct blkif_request_rw {
>       uint8_t        nr_segments;  /* number of segments                   */
>       blkif_vdev_t   handle;       /* only for read/write requests         */
> @@ -138,11 +150,24 @@ struct blkif_request_discard {
>       uint8_t        _pad3;
>  } __attribute__((__packed__));
>  
> +struct blkif_request_indirect {
> +     uint8_t        indirect_op;
> +     uint16_t       nr_segments;
> +#ifdef CONFIG_X86_64
> +     uint32_t       _pad1;        /* offsetof(blkif_...,u.indirect.id) == 8 
> */
> +#endif

Either you want the structure be packed tightly (and you don't care
about misaligned fields), in which case you shouldn't need a padding
field. That's even more so as there's no padding between indirect_op
and nr_segments, so everything is misaligned anyway, and the
comment above is wrong too (offsetof() really ought to yield 7 in
that case).

Or you want the structure fields aligned, in which case you again
ought to drop the use of the __packed__ attribute and introduce
_all_ necessary padding fields.

> +     uint64_t       id;
> +     blkif_vdev_t   handle;
> +     blkif_sector_t sector_number;
> +     grant_ref_t    indirect_grefs[BLKIF_MAX_INDIRECT_GREFS_PER_REQUEST];
> +} __attribute__((__packed__));

And then it would be quite nice for new features to no longer
require translation between a 32- and a 64-bit layout at all.

Plus, rather than introducing uninitialized padding fields, I'd
suggest using fields that are required to be zero initialized, to
allow giving them a meaning later.

Jan


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