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Linux/include/scsi/viosrp.h

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  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 /* This file contains structures and definitions for IBM RPA (RS/6000        */
 19 /* platform architecture) implementation of the SRP (SCSI RDMA Protocol)     */
 20 /* standard.  SRP is used on IBM iSeries and pSeries platforms to send SCSI  */
 21 /* commands between logical partitions.                                      */
 22 /*                                                                           */
 23 /* SRP Information Units (IUs) are sent on a "Command/Response Queue" (CRQ)  */
 24 /* between partitions.  The definitions in this file are architected,        */
 25 /* and cannot be changed without breaking compatibility with other versions  */
 26 /* of Linux and other operating systems (AIX, OS/400) that talk this protocol*/
 27 /* between logical partitions                                                */
 28 /*****************************************************************************/
 29 #ifndef VIOSRP_H
 30 #define VIOSRP_H
 31 #include <scsi/srp.h>
 32 
 33 #define SRP_VERSION "16.a"
 34 #define SRP_MAX_IU_LEN  256
 35 #define SRP_MAX_LOC_LEN 32
 36 
 37 union srp_iu {
 38         struct srp_login_req login_req;
 39         struct srp_login_rsp login_rsp;
 40         struct srp_login_rej login_rej;
 41         struct srp_i_logout i_logout;
 42         struct srp_t_logout t_logout;
 43         struct srp_tsk_mgmt tsk_mgmt;
 44         struct srp_cmd cmd;
 45         struct srp_rsp rsp;
 46         u8 reserved[SRP_MAX_IU_LEN];
 47 };
 48 
 49 enum viosrp_crq_headers {
 50         VIOSRP_CRQ_FREE = 0x00,
 51         VIOSRP_CRQ_CMD_RSP = 0x80,
 52         VIOSRP_CRQ_INIT_RSP = 0xC0,
 53         VIOSRP_CRQ_XPORT_EVENT = 0xFF
 54 };
 55 
 56 enum viosrp_crq_init_formats {
 57         VIOSRP_CRQ_INIT = 0x01,
 58         VIOSRP_CRQ_INIT_COMPLETE = 0x02
 59 };
 60 
 61 enum viosrp_crq_formats {
 62         VIOSRP_SRP_FORMAT = 0x01,
 63         VIOSRP_MAD_FORMAT = 0x02,
 64         VIOSRP_OS400_FORMAT = 0x03,
 65         VIOSRP_AIX_FORMAT = 0x04,
 66         VIOSRP_LINUX_FORMAT = 0x05,
 67         VIOSRP_INLINE_FORMAT = 0x06
 68 };
 69 
 70 enum viosrp_crq_status {
 71         VIOSRP_OK = 0x0,
 72         VIOSRP_NONRECOVERABLE_ERR = 0x1,
 73         VIOSRP_VIOLATES_MAX_XFER = 0x2,
 74         VIOSRP_PARTNER_PANIC = 0x3,
 75         VIOSRP_DEVICE_BUSY = 0x8,
 76         VIOSRP_ADAPTER_FAIL = 0x10,
 77         VIOSRP_OK2 = 0x99,
 78 };
 79 
 80 struct viosrp_crq {
 81         u8 valid;               /* used by RPA */
 82         u8 format;              /* SCSI vs out-of-band */
 83         u8 reserved;
 84         u8 status;              /* non-scsi failure? (e.g. DMA failure) */
 85         __be16 timeout;         /* in seconds */
 86         __be16 IU_length;               /* in bytes */
 87         __be64 IU_data_ptr;     /* the TCE for transferring data */
 88 };
 89 
 90 /* MADs are Management requests above and beyond the IUs defined in the SRP
 91  * standard.
 92  */
 93 enum viosrp_mad_types {
 94         VIOSRP_EMPTY_IU_TYPE = 0x01,
 95         VIOSRP_ERROR_LOG_TYPE = 0x02,
 96         VIOSRP_ADAPTER_INFO_TYPE = 0x03,
 97         VIOSRP_CAPABILITIES_TYPE = 0x05,
 98         VIOSRP_ENABLE_FAST_FAIL = 0x08,
 99 };
100 
101 enum viosrp_mad_status {
102         VIOSRP_MAD_SUCCESS = 0x00,
103         VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
104         VIOSRP_MAD_FAILED = 0xF7,
105 };
106 
107 enum viosrp_capability_type {
108         MIGRATION_CAPABILITIES = 0x01,
109         RESERVATION_CAPABILITIES = 0x02,
110 };
111 
112 enum viosrp_capability_support {
113         SERVER_DOES_NOT_SUPPORTS_CAP = 0x0,
114         SERVER_SUPPORTS_CAP = 0x01,
115         SERVER_CAP_DATA = 0x02,
116 };
117 
118 enum viosrp_reserve_type {
119         CLIENT_RESERVE_SCSI_2 = 0x01,
120 };
121 
122 enum viosrp_capability_flag {
123         CLIENT_MIGRATED = 0x01,
124         CLIENT_RECONNECT = 0x02,
125         CAP_LIST_SUPPORTED = 0x04,
126         CAP_LIST_DATA = 0x08,
127 };
128 
129 /*
130  * Common MAD header
131  */
132 struct mad_common {
133         __be32 type;
134         __be16 status;
135         __be16 length;
136         __be64 tag;
137 };
138 
139 /*
140  * All SRP (and MAD) requests normally flow from the
141  * client to the server.  There is no way for the server to send
142  * an asynchronous message back to the client.  The Empty IU is used
143  * to hang out a meaningless request to the server so that it can respond
144  * asynchrouously with something like a SCSI AER
145  */
146 struct viosrp_empty_iu {
147         struct mad_common common;
148         __be64 buffer;
149         __be32 port;
150 };
151 
152 struct viosrp_error_log {
153         struct mad_common common;
154         __be64 buffer;
155 };
156 
157 struct viosrp_adapter_info {
158         struct mad_common common;
159         __be64 buffer;
160 };
161 
162 struct viosrp_fast_fail {
163         struct mad_common common;
164 };
165 
166 struct viosrp_capabilities {
167         struct mad_common common;
168         __be64 buffer;
169 };
170 
171 struct mad_capability_common {
172         __be32 cap_type;
173         __be16 length;
174         __be16 server_support;
175 };
176 
177 struct mad_reserve_cap {
178         struct mad_capability_common common;
179         __be32 type;
180 };
181 
182 struct mad_migration_cap {
183         struct mad_capability_common common;
184         __be32 ecl;
185 };
186 
187 struct capabilities {
188         __be32 flags;
189         char name[SRP_MAX_LOC_LEN];
190         char loc[SRP_MAX_LOC_LEN];
191         struct mad_migration_cap migration;
192         struct mad_reserve_cap reserve;
193 };
194 
195 union mad_iu {
196         struct viosrp_empty_iu empty_iu;
197         struct viosrp_error_log error_log;
198         struct viosrp_adapter_info adapter_info;
199         struct viosrp_fast_fail fast_fail;
200         struct viosrp_capabilities capabilities;
201 };
202 
203 union viosrp_iu {
204         union srp_iu srp;
205         union mad_iu mad;
206 };
207 
208 struct mad_adapter_info_data {
209         char srp_version[8];
210         char partition_name[96];
211         __be32 partition_number;
212 #define SRP_MAD_VERSION_1 1
213         __be32 mad_version;
214 #define SRP_MAD_OS_LINUX 2
215 #define SRP_MAD_OS_AIX 3
216         __be32 os_type;
217         __be32 port_max_txu[8]; /* per-port maximum transfer */
218 };
219 
220 #endif
221 

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