FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/io/vscsiif.h

     /******************************************************************************
      * vscsiif.h
      * 
      * Based on the blkif.h code.
      * 
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright(c) FUJITSU Limited 2008.
     */
    
    #ifndef __XEN__PUBLIC_IO_SCSI_H__
    #define __XEN__PUBLIC_IO_SCSI_H__
    
    #include "ring.h"
    #include "../grant_table.h"
    
    /* command between backend and frontend */
    #define VSCSIIF_ACT_SCSI_CDB         1    /* SCSI CDB command */
    #define VSCSIIF_ACT_SCSI_ABORT       2    /* SCSI Device(Lun) Abort*/
    #define VSCSIIF_ACT_SCSI_RESET       3    /* SCSI Device(Lun) Reset*/
    
    
    #define VSCSIIF_BACK_MAX_PENDING_REQS    128
    
    /*
     * Maximum scatter/gather segments per request.
     *
     * Considering balance between allocating al least 16 "vscsiif_request"
     * structures on one page (4096bytes) and number of scatter gather 
     * needed, we decided to use 26 as a magic number.
     */
    #define VSCSIIF_SG_TABLESIZE             26
    
    /*
     * base on linux kernel 2.6.18
     */
    #define VSCSIIF_MAX_COMMAND_SIZE         16
    #define VSCSIIF_SENSE_BUFFERSIZE         96
    
    
    struct vscsiif_request {
        uint16_t rqid;          /* private guest value, echoed in resp  */
        uint8_t act;            /* command between backend and frontend */
        uint8_t cmd_len;
    
        uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
        uint16_t timeout_per_command;     /* The command is issued by twice 
                                             the value in Backend. */
        uint16_t channel, id, lun;
        uint16_t padding;
        uint8_t sc_data_direction;        /* for DMA_TO_DEVICE(1)
                                             DMA_FROM_DEVICE(2)
                                             DMA_NONE(3) requests  */
        uint8_t nr_segments;              /* Number of pieces of scatter-gather */
    
        struct scsiif_request_segment {
            grant_ref_t gref;
            uint16_t offset;
            uint16_t length;
        } seg[VSCSIIF_SG_TABLESIZE];
        uint32_t reserved[3];
    };
    typedef struct vscsiif_request vscsiif_request_t;
    
    struct vscsiif_response {
        uint16_t rqid;
        uint8_t padding;
        uint8_t sense_len;
        uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
        int32_t rslt;
        uint32_t residual_len;     /* request bufflen - 
                                      return the value from physical device */
        uint32_t reserved[36];
    };
    typedef struct vscsiif_response vscsiif_response_t;
    
    DEFINE_RING_TYPES(vscsiif, struct vscsiif_request, struct vscsiif_response);
    
    
    #endif  /*__XEN__PUBLIC_IO_SCSI_H__*/
    /*
     * Local variables:
     * mode: C
    * c-set-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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