include/scsi/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 /* 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