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88 lines
3.1 KiB
C
88 lines
3.1 KiB
C
/*
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* Copyright (c) 2008, XenSource Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of XenSource Inc. nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TAPDISK_RING_H_
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#define _TAPDISK_RING_H_
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#include <inttypes.h>
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#include <xenctrl.h>
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#include <xen/io/ring.h>
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typedef struct td_uring td_uring_t;
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typedef struct td_uring_header td_uring_header_t;
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typedef struct td_uring_request td_uring_request_t;
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typedef struct td_uring_response td_uring_response_t;
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struct td_uring {
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int ctlfd;
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char *shmem_path;
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char *ctlfd_path;
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void *shmem;
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void *ring_area;
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void *data_area;
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};
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struct td_uring_header {
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char cookie[8];
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uint32_t version;
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uint32_t shmem_size;
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uint32_t ring_size;
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uint32_t data_size;
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char reserved[4064];
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};
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struct td_uring_request {
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uint8_t op;
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uint64_t id;
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uint64_t sec;
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uint32_t secs;
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uint32_t offset;
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};
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struct td_uring_response {
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uint8_t op;
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uint64_t id;
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uint8_t status;
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};
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DEFINE_RING_TYPES(td_uring, td_uring_request_t, td_uring_response_t);
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int tapdisk_uring_create(td_uring_t *, const char *location,
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uint32_t ring_size, uint32_t data_size);
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int tapdisk_uring_destroy(td_uring_t *);
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int tapdisk_uring_connect(td_uring_t *, const char *location);
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int tapdisk_uring_disconnect(td_uring_t *);
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int tapdisk_uring_poll(td_uring_t *);
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int tapdisk_uring_kick(td_uring_t *);
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#endif
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