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Linux/include/scsi/viosrp.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*****************************************************************************/
  3 /* srp.h -- SCSI RDMA Protocol definitions                                   */
  4 /*                                                                           */
  5 /* Written By: Colin Devilbis, IBM Corporation                               */
  6 /*                                                                           */
  7 /* Copyright (C) 2003 IBM Corporation                                        */
  8 /*                                                                           */
  9 /*                                                                           */
 10 /* This file contains structures and definitions for IBM RPA (RS/6000        */
 11 /* platform architecture) implementation of the SRP (SCSI RDMA Protocol)     */
 12 /* standard.  SRP is used on IBM iSeries and pSeries platforms to send SCSI  */
 13 /* commands between logical partitions.                                      */
 14 /*                                                                           */
 15 /* SRP Information Units (IUs) are sent on a "Command/Response Queue" (CRQ)  */
 16 /* between partitions.  The definitions in this file are architected,        */
 17 /* and cannot be changed without breaking compatibility with other versions  */
 18 /* of Linux and other operating systems (AIX, OS/400) that talk this protocol*/
 19 /* between logical partitions                                                */
 20 /*****************************************************************************/
 21 #ifndef VIOSRP_H
 22 #define VIOSRP_H
 23 #include <scsi/srp.h>
 24 
 25 #define SRP_VERSION "16.a"
 26 #define SRP_MAX_IU_LEN  256
 27 #define SRP_MAX_LOC_LEN 32
 28 
 29 union srp_iu {
 30         struct srp_login_req login_req;
 31         struct srp_login_rsp login_rsp;
 32         struct srp_login_rej login_rej;
 33         struct srp_i_logout i_logout;
 34         struct srp_t_logout t_logout;
 35         struct srp_tsk_mgmt tsk_mgmt;
 36         struct srp_cmd cmd;
 37         struct srp_rsp rsp;
 38         u8 reserved[SRP_MAX_IU_LEN];
 39 };
 40 
 41 enum viosrp_crq_headers {
 42         VIOSRP_CRQ_FREE = 0x00,
 43         VIOSRP_CRQ_CMD_RSP = 0x80,
 44         VIOSRP_CRQ_INIT_RSP = 0xC0,
 45         VIOSRP_CRQ_XPORT_EVENT = 0xFF
 46 };
 47 
 48 enum viosrp_crq_init_formats {
 49         VIOSRP_CRQ_INIT = 0x01,
 50         VIOSRP_CRQ_INIT_COMPLETE = 0x02
 51 };
 52 
 53 enum viosrp_crq_formats {
 54         VIOSRP_SRP_FORMAT = 0x01,
 55         VIOSRP_MAD_FORMAT = 0x02,
 56         VIOSRP_OS400_FORMAT = 0x03,
 57         VIOSRP_AIX_FORMAT = 0x04,
 58         VIOSRP_LINUX_FORMAT = 0x05,
 59         VIOSRP_INLINE_FORMAT = 0x06
 60 };
 61 
 62 enum viosrp_crq_status {
 63         VIOSRP_OK = 0x0,
 64         VIOSRP_NONRECOVERABLE_ERR = 0x1,
 65         VIOSRP_VIOLATES_MAX_XFER = 0x2,
 66         VIOSRP_PARTNER_PANIC = 0x3,
 67         VIOSRP_DEVICE_BUSY = 0x8,
 68         VIOSRP_ADAPTER_FAIL = 0x10,
 69         VIOSRP_OK2 = 0x99,
 70 };
 71 
 72 struct viosrp_crq {
 73         u8 valid;               /* used by RPA */
 74         u8 format;              /* SCSI vs out-of-band */
 75         u8 reserved;
 76         u8 status;              /* non-scsi failure? (e.g. DMA failure) */
 77         __be16 timeout;         /* in seconds */
 78         __be16 IU_length;               /* in bytes */
 79         __be64 IU_data_ptr;     /* the TCE for transferring data */
 80 };
 81 
 82 /* MADs are Management requests above and beyond the IUs defined in the SRP
 83  * standard.
 84  */
 85 enum viosrp_mad_types {
 86         VIOSRP_EMPTY_IU_TYPE = 0x01,
 87         VIOSRP_ERROR_LOG_TYPE = 0x02,
 88         VIOSRP_ADAPTER_INFO_TYPE = 0x03,
 89         VIOSRP_CAPABILITIES_TYPE = 0x05,
 90         VIOSRP_ENABLE_FAST_FAIL = 0x08,
 91 };
 92 
 93 enum viosrp_mad_status {
 94         VIOSRP_MAD_SUCCESS = 0x00,
 95         VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
 96         VIOSRP_MAD_FAILED = 0xF7,
 97 };
 98 
 99 enum viosrp_capability_type {
100         MIGRATION_CAPABILITIES = 0x01,
101         RESERVATION_CAPABILITIES = 0x02,
102 };
103 
104 enum viosrp_capability_support {
105         SERVER_DOES_NOT_SUPPORTS_CAP = 0x0,
106         SERVER_SUPPORTS_CAP = 0x01,
107         SERVER_CAP_DATA = 0x02,
108 };
109 
110 enum viosrp_reserve_type {
111         CLIENT_RESERVE_SCSI_2 = 0x01,
112 };
113 
114 enum viosrp_capability_flag {
115         CLIENT_MIGRATED = 0x01,
116         CLIENT_RECONNECT = 0x02,
117         CAP_LIST_SUPPORTED = 0x04,
118         CAP_LIST_DATA = 0x08,
119 };
120 
121 /*
122  * Common MAD header
123  */
124 struct mad_common {
125         __be32 type;
126         __be16 status;
127         __be16 length;
128         __be64 tag;
129 };
130 
131 /*
132  * All SRP (and MAD) requests normally flow from the
133  * client to the server.  There is no way for the server to send
134  * an asynchronous message back to the client.  The Empty IU is used
135  * to hang out a meaningless request to the server so that it can respond
136  * asynchrouously with something like a SCSI AER
137  */
138 struct viosrp_empty_iu {
139         struct mad_common common;
140         __be64 buffer;
141         __be32 port;
142 };
143 
144 struct viosrp_error_log {
145         struct mad_common common;
146         __be64 buffer;
147 };
148 
149 struct viosrp_adapter_info {
150         struct mad_common common;
151         __be64 buffer;
152 };
153 
154 struct viosrp_fast_fail {
155         struct mad_common common;
156 };
157 
158 struct viosrp_capabilities {
159         struct mad_common common;
160         __be64 buffer;
161 };
162 
163 struct mad_capability_common {
164         __be32 cap_type;
165         __be16 length;
166         __be16 server_support;
167 };
168 
169 struct mad_reserve_cap {
170         struct mad_capability_common common;
171         __be32 type;
172 };
173 
174 struct mad_migration_cap {
175         struct mad_capability_common common;
176         __be32 ecl;
177 };
178 
179 struct capabilities {
180         __be32 flags;
181         char name[SRP_MAX_LOC_LEN];
182         char loc[SRP_MAX_LOC_LEN];
183         struct mad_migration_cap migration;
184         struct mad_reserve_cap reserve;
185 };
186 
187 union mad_iu {
188         struct viosrp_empty_iu empty_iu;
189         struct viosrp_error_log error_log;
190         struct viosrp_adapter_info adapter_info;
191         struct viosrp_fast_fail fast_fail;
192         struct viosrp_capabilities capabilities;
193 };
194 
195 union viosrp_iu {
196         union srp_iu srp;
197         union mad_iu mad;
198 };
199 
200 struct mad_adapter_info_data {
201         char srp_version[8];
202         char partition_name[96];
203         __be32 partition_number;
204 #define SRP_MAD_VERSION_1 1
205         __be32 mad_version;
206 #define SRP_MAD_OS_LINUX 2
207 #define SRP_MAD_OS_AIX 3
208         __be32 os_type;
209         __be32 port_max_txu[8]; /* per-port maximum transfer */
210 };
211 
212 #endif
213 

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