From 575e6e9b483ec2cb75c8319894db985927d4eddb Mon Sep 17 00:00:00 2001 From: Keir Fraser Date: Mon, 2 Jun 2008 09:59:29 +0100 Subject: [PATCH] vscsiif.h: define interface between frontend and backend driver Signed-off-by: Tomonari Horikoshi Signed-off-by: Jun Kamada --- include/xen/interface/io/vscsiif.h | 103 +++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 include/xen/interface/io/vscsiif.h diff --git a/include/xen/interface/io/vscsiif.h b/include/xen/interface/io/vscsiif.h new file mode 100644 index 00000000..71bf2c0a --- /dev/null +++ b/include/xen/interface/io/vscsiif.h @@ -0,0 +1,103 @@ +/****************************************************************************** + * 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 reserved[37]; +}; +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: + */ -- 2.39.5