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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
29union 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
41enum 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
48enum viosrp_crq_init_formats {
49 VIOSRP_CRQ_INIT = 0x01,
50 VIOSRP_CRQ_INIT_COMPLETE = 0x02
51};
52
53enum 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
62enum 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
72struct viosrp_crq {
73 union {
74 __be64 high; /* High 64 bits */
75 struct {
76 u8 valid; /* used by RPA */
77 u8 format; /* SCSI vs out-of-band */
78 u8 reserved;
79 u8 status; /* non-scsi failure? (e.g. DMA failure) */
80 __be16 timeout; /* in seconds */
81 __be16 IU_length; /* in bytes */
82 };
83 };
84 __be64 IU_data_ptr; /* the TCE for transferring data */
85};
86
87/* MADs are Management requests above and beyond the IUs defined in the SRP
88 * standard.
89 */
90enum viosrp_mad_types {
91 VIOSRP_EMPTY_IU_TYPE = 0x01,
92 VIOSRP_ERROR_LOG_TYPE = 0x02,
93 VIOSRP_ADAPTER_INFO_TYPE = 0x03,
94 VIOSRP_CAPABILITIES_TYPE = 0x05,
95 VIOSRP_ENABLE_FAST_FAIL = 0x08,
96};
97
98enum viosrp_mad_status {
99 VIOSRP_MAD_SUCCESS = 0x00,
100 VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
101 VIOSRP_MAD_FAILED = 0xF7,
102};
103
104enum viosrp_capability_type {
105 MIGRATION_CAPABILITIES = 0x01,
106 RESERVATION_CAPABILITIES = 0x02,
107};
108
109enum viosrp_capability_support {
110 SERVER_DOES_NOT_SUPPORTS_CAP = 0x0,
111 SERVER_SUPPORTS_CAP = 0x01,
112 SERVER_CAP_DATA = 0x02,
113};
114
115enum viosrp_reserve_type {
116 CLIENT_RESERVE_SCSI_2 = 0x01,
117};
118
119enum viosrp_capability_flag {
120 CLIENT_MIGRATED = 0x01,
121 CLIENT_RECONNECT = 0x02,
122 CAP_LIST_SUPPORTED = 0x04,
123 CAP_LIST_DATA = 0x08,
124};
125
126/*
127 * Common MAD header
128 */
129struct mad_common {
130 __be32 type;
131 __be16 status;
132 __be16 length;
133 __be64 tag;
134};
135
136/*
137 * All SRP (and MAD) requests normally flow from the
138 * client to the server. There is no way for the server to send
139 * an asynchronous message back to the client. The Empty IU is used
140 * to hang out a meaningless request to the server so that it can respond
141 * asynchrouously with something like a SCSI AER
142 */
143struct viosrp_empty_iu {
144 struct mad_common common;
145 __be64 buffer;
146 __be32 port;
147};
148
149struct viosrp_error_log {
150 struct mad_common common;
151 __be64 buffer;
152};
153
154struct viosrp_adapter_info {
155 struct mad_common common;
156 __be64 buffer;
157};
158
159struct viosrp_fast_fail {
160 struct mad_common common;
161};
162
163struct viosrp_capabilities {
164 struct mad_common common;
165 __be64 buffer;
166};
167
168struct mad_capability_common {
169 __be32 cap_type;
170 __be16 length;
171 __be16 server_support;
172};
173
174struct mad_reserve_cap {
175 struct mad_capability_common common;
176 __be32 type;
177};
178
179struct mad_migration_cap {
180 struct mad_capability_common common;
181 __be32 ecl;
182};
183
184struct capabilities {
185 __be32 flags;
186 char name[SRP_MAX_LOC_LEN];
187 char loc[SRP_MAX_LOC_LEN];
188 struct mad_migration_cap migration;
189 struct mad_reserve_cap reserve;
190};
191
192union mad_iu {
193 struct viosrp_empty_iu empty_iu;
194 struct viosrp_error_log error_log;
195 struct viosrp_adapter_info adapter_info;
196 struct viosrp_fast_fail fast_fail;
197 struct viosrp_capabilities capabilities;
198};
199
200union viosrp_iu {
201 union srp_iu srp;
202 union mad_iu mad;
203};
204
205struct mad_adapter_info_data {
206 char srp_version[8];
207 char partition_name[96];
208 __be32 partition_number;
209#define SRP_MAD_VERSION_1 1
210 __be32 mad_version;
211#define SRP_MAD_OS_LINUX 2
212#define SRP_MAD_OS_AIX 3
213 __be32 os_type;
214 __be32 port_max_txu[8]; /* per-port maximum transfer */
215};
216
217#endif