86178a576b
Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
#ifndef __XEN_BLKIF_H__
|
|
#define __XEN_BLKIF_H__
|
|
|
|
#include <xen/io/ring.h>
|
|
#include <xen/io/blkif.h>
|
|
#include <xen/io/protocols.h>
|
|
|
|
/* Not a real protocol. Used to generate ring structs which contain
|
|
* the elements common to all protocols only. This way we get a
|
|
* compiler-checkable way to use common struct elements, so we can
|
|
* avoid using switch(protocol) in a number of places. */
|
|
struct blkif_common_request {
|
|
char dummy;
|
|
};
|
|
struct blkif_common_response {
|
|
char dummy;
|
|
};
|
|
|
|
/* i386 protocol version */
|
|
#pragma pack(push, 4)
|
|
struct blkif_x86_32_request {
|
|
uint8_t operation; /* BLKIF_OP_??? */
|
|
uint8_t nr_segments; /* number of segments */
|
|
blkif_vdev_t handle; /* only for read/write requests */
|
|
uint64_t id; /* private guest value, echoed in resp */
|
|
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
|
|
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
|
|
};
|
|
struct blkif_x86_32_response {
|
|
uint64_t id; /* copied from request */
|
|
uint8_t operation; /* copied from request */
|
|
int16_t status; /* BLKIF_RSP_??? */
|
|
};
|
|
typedef struct blkif_x86_32_request blkif_x86_32_request_t;
|
|
typedef struct blkif_x86_32_response blkif_x86_32_response_t;
|
|
#pragma pack(pop)
|
|
|
|
/* x86_64 protocol version */
|
|
struct blkif_x86_64_request {
|
|
uint8_t operation; /* BLKIF_OP_??? */
|
|
uint8_t nr_segments; /* number of segments */
|
|
blkif_vdev_t handle; /* only for read/write requests */
|
|
uint64_t __attribute__((__aligned__(8))) id;
|
|
blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
|
|
struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
|
|
};
|
|
struct blkif_x86_64_response {
|
|
uint64_t __attribute__((__aligned__(8))) id;
|
|
uint8_t operation; /* copied from request */
|
|
int16_t status; /* BLKIF_RSP_??? */
|
|
};
|
|
typedef struct blkif_x86_64_request blkif_x86_64_request_t;
|
|
typedef struct blkif_x86_64_response blkif_x86_64_response_t;
|
|
|
|
DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, struct blkif_common_response);
|
|
DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, struct blkif_x86_32_response);
|
|
DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, struct blkif_x86_64_response);
|
|
|
|
union blkif_back_rings {
|
|
blkif_back_ring_t native;
|
|
blkif_common_back_ring_t common;
|
|
blkif_x86_32_back_ring_t x86_32_part;
|
|
blkif_x86_64_back_ring_t x86_64_part;
|
|
};
|
|
typedef union blkif_back_rings blkif_back_rings_t;
|
|
|
|
enum blkif_protocol {
|
|
BLKIF_PROTOCOL_NATIVE = 1,
|
|
BLKIF_PROTOCOL_X86_32 = 2,
|
|
BLKIF_PROTOCOL_X86_64 = 3,
|
|
};
|
|
|
|
static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_request_t *src)
|
|
{
|
|
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
|
|
|
|
dst->operation = src->operation;
|
|
dst->nr_segments = src->nr_segments;
|
|
dst->handle = src->handle;
|
|
dst->id = src->id;
|
|
dst->sector_number = src->sector_number;
|
|
if (n > src->nr_segments)
|
|
n = src->nr_segments;
|
|
for (i = 0; i < n; i++)
|
|
dst->seg[i] = src->seg[i];
|
|
}
|
|
|
|
static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_request_t *src)
|
|
{
|
|
int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
|
|
|
|
dst->operation = src->operation;
|
|
dst->nr_segments = src->nr_segments;
|
|
dst->handle = src->handle;
|
|
dst->id = src->id;
|
|
dst->sector_number = src->sector_number;
|
|
if (n > src->nr_segments)
|
|
n = src->nr_segments;
|
|
for (i = 0; i < n; i++)
|
|
dst->seg[i] = src->seg[i];
|
|
}
|
|
|
|
#endif /* __XEN_BLKIF_H__ */
|