1251767Sgibbs/****************************************************************************** 2251767Sgibbs * vscsiif.h 3251767Sgibbs * 4251767Sgibbs * Based on the blkif.h code. 5251767Sgibbs * 6251767Sgibbs * Permission is hereby granted, free of charge, to any person obtaining a copy 7251767Sgibbs * of this software and associated documentation files (the "Software"), to 8251767Sgibbs * deal in the Software without restriction, including without limitation the 9251767Sgibbs * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10251767Sgibbs * sell copies of the Software, and to permit persons to whom the Software is 11251767Sgibbs * furnished to do so, subject to the following conditions: 12251767Sgibbs * 13251767Sgibbs * The above copyright notice and this permission notice shall be included in 14251767Sgibbs * all copies or substantial portions of the Software. 15251767Sgibbs * 16251767Sgibbs * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17251767Sgibbs * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18251767Sgibbs * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19251767Sgibbs * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20251767Sgibbs * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21251767Sgibbs * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22251767Sgibbs * DEALINGS IN THE SOFTWARE. 23251767Sgibbs * 24251767Sgibbs * Copyright(c) FUJITSU Limited 2008. 25251767Sgibbs */ 26251767Sgibbs 27251767Sgibbs#ifndef __XEN__PUBLIC_IO_SCSI_H__ 28251767Sgibbs#define __XEN__PUBLIC_IO_SCSI_H__ 29251767Sgibbs 30251767Sgibbs#include "ring.h" 31251767Sgibbs#include "../grant_table.h" 32251767Sgibbs 33251767Sgibbs/* command between backend and frontend */ 34251767Sgibbs#define VSCSIIF_ACT_SCSI_CDB 1 /* SCSI CDB command */ 35251767Sgibbs#define VSCSIIF_ACT_SCSI_ABORT 2 /* SCSI Device(Lun) Abort*/ 36251767Sgibbs#define VSCSIIF_ACT_SCSI_RESET 3 /* SCSI Device(Lun) Reset*/ 37251767Sgibbs 38251767Sgibbs 39251767Sgibbs#define VSCSIIF_BACK_MAX_PENDING_REQS 128 40251767Sgibbs 41251767Sgibbs/* 42251767Sgibbs * Maximum scatter/gather segments per request. 43251767Sgibbs * 44251767Sgibbs * Considering balance between allocating al least 16 "vscsiif_request" 45251767Sgibbs * structures on one page (4096bytes) and number of scatter gather 46251767Sgibbs * needed, we decided to use 26 as a magic number. 47251767Sgibbs */ 48251767Sgibbs#define VSCSIIF_SG_TABLESIZE 26 49251767Sgibbs 50251767Sgibbs/* 51251767Sgibbs * base on linux kernel 2.6.18 52251767Sgibbs */ 53251767Sgibbs#define VSCSIIF_MAX_COMMAND_SIZE 16 54251767Sgibbs#define VSCSIIF_SENSE_BUFFERSIZE 96 55251767Sgibbs 56251767Sgibbs 57251767Sgibbsstruct vscsiif_request { 58251767Sgibbs uint16_t rqid; /* private guest value, echoed in resp */ 59251767Sgibbs uint8_t act; /* command between backend and frontend */ 60251767Sgibbs uint8_t cmd_len; 61251767Sgibbs 62251767Sgibbs uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; 63251767Sgibbs uint16_t timeout_per_command; /* The command is issued by twice 64251767Sgibbs the value in Backend. */ 65251767Sgibbs uint16_t channel, id, lun; 66251767Sgibbs uint16_t padding; 67251767Sgibbs uint8_t sc_data_direction; /* for DMA_TO_DEVICE(1) 68251767Sgibbs DMA_FROM_DEVICE(2) 69251767Sgibbs DMA_NONE(3) requests */ 70251767Sgibbs uint8_t nr_segments; /* Number of pieces of scatter-gather */ 71251767Sgibbs 72251767Sgibbs struct scsiif_request_segment { 73251767Sgibbs grant_ref_t gref; 74251767Sgibbs uint16_t offset; 75251767Sgibbs uint16_t length; 76251767Sgibbs } seg[VSCSIIF_SG_TABLESIZE]; 77251767Sgibbs uint32_t reserved[3]; 78251767Sgibbs}; 79251767Sgibbstypedef struct vscsiif_request vscsiif_request_t; 80251767Sgibbs 81251767Sgibbsstruct vscsiif_response { 82251767Sgibbs uint16_t rqid; 83251767Sgibbs uint8_t padding; 84251767Sgibbs uint8_t sense_len; 85251767Sgibbs uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; 86251767Sgibbs int32_t rslt; 87251767Sgibbs uint32_t residual_len; /* request bufflen - 88251767Sgibbs return the value from physical device */ 89251767Sgibbs uint32_t reserved[36]; 90251767Sgibbs}; 91251767Sgibbstypedef struct vscsiif_response vscsiif_response_t; 92251767Sgibbs 93251767SgibbsDEFINE_RING_TYPES(vscsiif, struct vscsiif_request, struct vscsiif_response); 94251767Sgibbs 95251767Sgibbs 96251767Sgibbs#endif /*__XEN__PUBLIC_IO_SCSI_H__*/ 97251767Sgibbs/* 98251767Sgibbs * Local variables: 99251767Sgibbs * mode: C 100251767Sgibbs * c-set-style: "BSD" 101251767Sgibbs * c-basic-offset: 4 102251767Sgibbs * tab-width: 4 103251767Sgibbs * indent-tabs-mode: nil 104251767Sgibbs * End: 105251767Sgibbs */ 106