1 /* 2 * Copyright (c) 2008, XenSource Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * * Neither the name of XenSource Inc. nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #ifndef _TAPDISK_RING_H_ 29 #define _TAPDISK_RING_H_ 30 31 #include <inttypes.h> 32 33 #include <xenctrl.h> 34 #include <xen/io/ring.h> 35 36 typedef struct td_uring td_uring_t; 37 typedef struct td_uring_header td_uring_header_t; 38 typedef struct td_uring_request td_uring_request_t; 39 typedef struct td_uring_response td_uring_response_t; 40 41 struct td_uring { 42 int ctlfd; 43 44 char *shmem_path; 45 char *ctlfd_path; 46 47 void *shmem; 48 void *ring_area; 49 void *data_area; 50 }; 51 52 struct td_uring_header { 53 char cookie[8]; 54 uint32_t version; 55 uint32_t shmem_size; 56 uint32_t ring_size; 57 uint32_t data_size; 58 char reserved[4064]; 59 }; 60 61 struct td_uring_request { 62 uint8_t op; 63 uint64_t id; 64 uint64_t sec; 65 uint32_t secs; 66 uint32_t offset; 67 }; 68 69 struct td_uring_response { 70 uint8_t op; 71 uint64_t id; 72 uint8_t status; 73 }; 74 75 DEFINE_RING_TYPES(td_uring, td_uring_request_t, td_uring_response_t); 76 77 int tapdisk_uring_create(td_uring_t *, const char *location, 78 uint32_t ring_size, uint32_t data_size); 79 int tapdisk_uring_destroy(td_uring_t *); 80 81 int tapdisk_uring_connect(td_uring_t *, const char *location); 82 int tapdisk_uring_disconnect(td_uring_t *); 83 84 int tapdisk_uring_poll(td_uring_t *); 85 int tapdisk_uring_kick(td_uring_t *); 86 87 #endif 88