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[linux-2.6.git] / drivers / scsi / ibmvscsi / viosrp.h
1 /*****************************************************************************/
2 /* srp.h -- SCSI RDMA Protocol definitions                                   */
3 /*                                                                           */
4 /* Written By: Colin Devilbis, IBM Corporation                               */
5 /*                                                                           */
6 /* Copyright (C) 2003 IBM Corporation                                        */
7 /*                                                                           */
8 /* This program is free software; you can redistribute it and/or modify      */
9 /* it under the terms of the GNU General Public License as published by      */
10 /* the Free Software Foundation; either version 2 of the License, or         */
11 /* (at your option) any later version.                                       */
12 /*                                                                           */
13 /* This program is distributed in the hope that it will be useful,           */
14 /* but WITHOUT ANY WARRANTY; without even the implied warranty of            */
15 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             */
16 /* GNU General Public License for more details.                              */
17 /*                                                                           */
18 /* You should have received a copy of the GNU General Public License         */
19 /* along with this program; if not, write to the Free Software               */
20 /* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
21 /*                                                                           */
22 /*                                                                           */
23 /* This file contains structures and definitions for IBM RPA (RS/6000        */
24 /* platform architecture) implementation of the SRP (SCSI RDMA Protocol)     */
25 /* standard.  SRP is used on IBM iSeries and pSeries platforms to send SCSI  */
26 /* commands between logical partitions.                                      */
27 /*                                                                           */
28 /* SRP Information Units (IUs) are sent on a "Command/Response Queue" (CRQ)  */
29 /* between partitions.  The definitions in this file are architected,        */
30 /* and cannot be changed without breaking compatibility with other versions  */
31 /* of Linux and other operating systems (AIX, OS/400) that talk this protocol*/
32 /* between logical partitions                                                */
33 /*****************************************************************************/
34 #ifndef VIOSRP_H
35 #define VIOSRP_H
36 #include "srp.h"
37
38 enum viosrp_crq_formats {
39         VIOSRP_SRP_FORMAT = 0x01,
40         VIOSRP_MAD_FORMAT = 0x02,
41         VIOSRP_OS400_FORMAT = 0x03,
42         VIOSRP_AIX_FORMAT = 0x04,
43         VIOSRP_LINUX_FORMAT = 0x06,
44         VIOSRP_INLINE_FORMAT = 0x07
45 };
46
47 struct viosrp_crq {
48         u8 valid;               /* used by RPA */
49         u8 format;              /* SCSI vs out-of-band */
50         u8 reserved;
51         u8 status;              /* non-scsi failure? (e.g. DMA failure) */
52         u16 timeout;            /* in seconds */
53         u16 IU_length;          /* in bytes */
54         u64 IU_data_ptr;        /* the TCE for transferring data */
55 };
56
57 /* MADs are Management requests above and beyond the IUs defined in the SRP
58  * standard.  
59  */
60 enum viosrp_mad_types {
61         VIOSRP_EMPTY_IU_TYPE = 0x01,
62         VIOSRP_ERROR_LOG_TYPE = 0x02,
63         VIOSRP_ADAPTER_INFO_TYPE = 0x03,
64         VIOSRP_HOST_CONFIG_TYPE = 0x04
65 };
66
67 /* 
68  * Common MAD header
69  */
70 struct mad_common {
71         u32 type;
72         u16 status;
73         u16 length;
74         u64 tag;
75 };
76
77 /*
78  * All SRP (and MAD) requests normally flow from the
79  * client to the server.  There is no way for the server to send
80  * an asynchronous message back to the client.  The Empty IU is used
81  * to hang out a meaningless request to the server so that it can respond
82  * asynchrouously with something like a SCSI AER 
83  */
84 struct viosrp_empty_iu {
85         struct mad_common common;
86         u64 buffer;
87         u32 port;
88 };
89
90 struct viosrp_error_log {
91         struct mad_common common;
92         u64 buffer;
93 };
94
95 struct viosrp_adapter_info {
96         struct mad_common common;
97         u64 buffer;
98 };
99
100 struct viosrp_host_config {
101         struct mad_common common;
102         u64 buffer;
103 };
104
105 union mad_iu {
106         struct viosrp_empty_iu empty_iu;
107         struct viosrp_error_log error_log;
108         struct viosrp_adapter_info adapter_info;
109         struct viosrp_host_config host_config;
110 };
111
112 union viosrp_iu {
113         union srp_iu srp;
114         union mad_iu mad;
115 };
116
117 struct mad_adapter_info_data {
118         char srp_version[8];
119         char partition_name[96];
120         u32 partition_number;
121         u32 mad_version;
122         u32 os_type;
123         u32 port_max_txu[8];    /* per-port maximum transfer */
124 };
125
126 #endif