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virtio: simplify config mechanism.

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Previously we used a type/len pair within the config space, but this
seems overkill.  We now simply define a structure which represents the
layout in the config space: the config space can now only be extended
at the end.

The main driver-visible changes:
1) We indicate what fields are present with an explicit feature bit.
2) Virtqueues are explicitly numbered, and not in the config space.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2008-02-04 23:49:56 -05:00
parent f35d9d8aae
commit a586d4f601
11 changed files with 278 additions and 279 deletions
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20
include/linux/virtio_blk.h
View file

@ -6,15 +6,19 @@
#define VIRTIO_ID_BLOCK 2
/* Feature bits */
#define VIRTIO_CONFIG_BLK_F 0x40
#define VIRTIO_BLK_F_BARRIER 1 /* Does host support barriers? */
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
/* The capacity (in 512-byte sectors). */
#define VIRTIO_CONFIG_BLK_F_CAPACITY 0x41
/* The maximum segment size. */
#define VIRTIO_CONFIG_BLK_F_SIZE_MAX 0x42
/* The maximum number of segments. */
#define VIRTIO_CONFIG_BLK_F_SEG_MAX 0x43
struct virtio_blk_config
{
/* The capacity (in 512-byte sectors). */
__le64 capacity;
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
__le32 size_max;
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
__le32 seg_max;
} __attribute__((packed));
/* These two define direction. */
#define VIRTIO_BLK_T_IN 0