/* $NetBSD: xenring.h,v 1.6.20.2 2024/07/20 16:11:26 martin Exp $ */ /* * Glue goop for xbd ring request/response protocol structures. * * These are used only from __XEN_INTERFACE_VERSION__ >= 0x00030201 * prior to which they were part of the public XEN api. */ #ifndef _XEN_RING_H #define _XEN_RING_H #if (__XEN_INTERFACE_VERSION__ >= 0x00030201) && \ (__XEN_INTERFACE_VERSION < 0x00030208) #include /* * Undo namespace damage from xen/include/public/io/ring.h * The proper fix is to get upstream to stop assuming that all OSs use * mb(), rmb(), wmb(). */ #undef xen_mb #undef xen_rmb #undef xen_wmb void xen_mb(void); #define xen_rmb() membar_acquire() #define xen_wmb() membar_release() /* * Define ring types. These were previously part of the public API. * Not anymore. */ /* i386 requests/responses */ 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]; } __packed; typedef struct blkif_x86_32_request blkif_x86_32_request_t; struct blkif_x86_32_response { uint64_t id; /* copied from request */ uint8_t operation; /* copied from request */ uint8_t _pad; int16_t status; /* BLKIF_RSP_??? */ } __packed; typedef struct blkif_x86_32_response blkif_x86_32_response_t; struct blkif_x86_32_request_indirect { uint8_t operation; /* BLKIF_OP_INDIRECT */ uint8_t indirect_op; /* BLKIF_OP_{READ/WRITE} */ uint16_t nr_segments; /* number of segments */ uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ blkif_vdev_t handle; /* only for read/write requests */ uint16_t _pad2; grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST]; uint64_t _pad3; /* make it 64 byte aligned */ } __packed; typedef struct blkif_x86_32_request_indirect blkif_x86_32_request_indirect_t; /* amd64-type requests/responses (always used in frontends ) */ 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;/* 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]; }; typedef struct blkif_x86_64_request blkif_x86_64_request_t; struct blkif_x86_64_response { uint64_t __attribute__((__aligned__(8))) id; /* copied from request */ uint8_t operation; /* copied from request */ int16_t status; /* BLKIF_RSP_??? */ }; typedef struct blkif_x86_64_response blkif_x86_64_response_t; struct blkif_x86_64_request_indirect { uint8_t operation; /* BLKIF_OP_INDIRECT */ uint8_t indirect_op; /* BLKIF_OP_{READ/WRITE} */ uint16_t nr_segments; /* number of segments */ uint32_t _pad1; uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ blkif_vdev_t handle; /* only for read/write requests */ uint16_t _pad2; grant_ref_t indirect_grefs[BLKIF_MAX_INDIRECT_PAGES_PER_REQUEST]; uint32_t _pad3; /* make it 64 byte aligned */ } __packed; typedef struct blkif_x86_64_request_indirect blkif_x86_64_request_indirect_t; CTASSERT(sizeof(struct blkif_x86_32_request_indirect) == sizeof(struct blkif_x86_64_request_indirect)); CTASSERT(sizeof(struct blkif_request_indirect) == sizeof(struct blkif_x86_64_request_indirect)); 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_ring_proto { blkif_back_ring_t ring_n; /* native/common members */ blkif_x86_32_back_ring_t ring_32; blkif_x86_64_back_ring_t ring_64; }; typedef union blkif_back_ring_proto blkif_back_ring_proto_t; #endif /* __XEN_INTERFACE_VERSION__ */ #endif /* _XEN_RING_H_ */