include/linux/nvme-fc.h

   1 /*
   2  * Copyright (c) 2016 Avago Technologies.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful.
   9  * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
  10  * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
  11  * PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO
  12  * THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.
  13  * See the GNU General Public License for more details, a copy of which
  14  * can be found in the file COPYING included with this package
  15  *
  16  */
  17
  18 /*
  19  * This file contains definitions relative to FC-NVME r1.14 (16-020vB).
  20  * The fcnvme_lsdesc_cr_assoc_cmd struct reflects expected r1.16 content.
  21  */
  22
  23 #ifndef _NVME_FC_H
  24 #define _NVME_FC_H 1
  25
  26
  27 #define NVME_CMD_SCSI_ID                0xFD
  28 #define NVME_CMD_FC_ID                  FC_TYPE_NVME
  29
  30 /* FC-NVME Cmd IU Flags */
  31 #define FCNVME_CMD_FLAGS_DIRMASK        0x03
  32 #define FCNVME_CMD_FLAGS_WRITE          0x01
  33 #define FCNVME_CMD_FLAGS_READ           0x02
  34
  35 struct nvme_fc_cmd_iu {
  36         __u8                    scsi_id;
  37         __u8                    fc_id;
  38         __be16                  iu_len;
  39         __u8                    rsvd4[3];
  40         __u8                    flags;
  41         __be64                  connection_id;
  42         __be32                  csn;
  43         __be32                  data_len;
  44         struct nvme_command     sqe;
  45         __be32                  rsvd88[2];
  46 };
  47
  48 #define NVME_FC_SIZEOF_ZEROS_RSP        12
  49
  50 enum {
  51         FCNVME_SC_SUCCESS               = 0,
  52         FCNVME_SC_INVALID_FIELD         = 1,
  53         FCNVME_SC_INVALID_CONNID        = 2,
  54 };
  55
  56 struct nvme_fc_ersp_iu {
  57         __u8                    status_code;
  58         __u8                    rsvd1;
  59         __be16                  iu_len;
  60         __be32                  rsn;
  61         __be32                  xfrd_len;
  62         __be32                  rsvd12;
  63         struct nvme_completion  cqe;
  64         /* for now - no additional payload */
  65 };
  66
  67
  68 /* FC-NVME Link Services */
  69 enum {
  70         FCNVME_LS_RSVD                  = 0,
  71         FCNVME_LS_RJT                   = 1,
  72         FCNVME_LS_ACC                   = 2,
  73         FCNVME_LS_CREATE_ASSOCIATION    = 3,
  74         FCNVME_LS_CREATE_CONNECTION     = 4,
  75         FCNVME_LS_DISCONNECT            = 5,
  76 };
  77
  78 /* FC-NVME Link Service Descriptors */
  79 enum {
  80         FCNVME_LSDESC_RSVD              = 0x0,
  81         FCNVME_LSDESC_RQST              = 0x1,
  82         FCNVME_LSDESC_RJT               = 0x2,
  83         FCNVME_LSDESC_CREATE_ASSOC_CMD  = 0x3,
  84         FCNVME_LSDESC_CREATE_CONN_CMD   = 0x4,
  85         FCNVME_LSDESC_DISCONN_CMD       = 0x5,
  86         FCNVME_LSDESC_CONN_ID           = 0x6,
  87         FCNVME_LSDESC_ASSOC_ID          = 0x7,
  88 };
  89
  90
  91 /* ********** start of Link Service Descriptors ********** */
  92
  93
  94 /*
  95  * fills in length of a descriptor. Struture minus descriptor header
  96  */
  97 static inline __be32 fcnvme_lsdesc_len(size_t sz)
  98 {
  99         return cpu_to_be32(sz - (2 * sizeof(u32)));
 100 }
 101
 102 struct fcnvme_ls_rqst_w0 {
 103         u8      ls_cmd;                 /* FCNVME_LS_xxx */
 104         u8      zeros[3];
 105 };
 106
 107 /* FCNVME_LSDESC_RQST */
 108 struct fcnvme_lsdesc_rqst {
 109         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 110         __be32  desc_len;
 111         struct fcnvme_ls_rqst_w0        w0;
 112         __be32  rsvd12;
 113 };
 114
 115 /* FC-NVME LS RJT reason_code values */
 116 enum fcnvme_ls_rjt_reason {
 117         FCNVME_RJT_RC_NONE              = 0,
 118         /* no reason - not to be sent */
 119
 120         FCNVME_RJT_RC_INVAL             = 0x01,
 121         /* invalid NVMe_LS command code */
 122
 123         FCNVME_RJT_RC_LOGIC             = 0x03,
 124         /* logical error */
 125
 126         FCNVME_RJT_RC_UNAB              = 0x09,
 127         /* unable to perform command request */
 128
 129         FCNVME_RJT_RC_UNSUP             = 0x0b,
 130         /* command not supported */
 131
 132         FCNVME_RJT_RC_INPROG            = 0x0e,
 133         /* command already in progress */
 134
 135         FCNVME_RJT_RC_INV_ASSOC         = 0x40,
 136         /* Invalid Association ID*/
 137
 138         FCNVME_RJT_RC_INV_CONN          = 0x41,
 139         /* Invalid Connection ID*/
 140
 141         FCNVME_RJT_RC_VENDOR            = 0xff,
 142         /* vendor specific error */
 143 };
 144
 145 /* FC-NVME LS RJT reason_explanation values */
 146 enum fcnvme_ls_rjt_explan {
 147         FCNVME_RJT_EXP_NONE             = 0x00,
 148         /* No additional explanation */
 149
 150         FCNVME_RJT_EXP_OXID_RXID        = 0x17,
 151         /* invalid OX_ID-RX_ID combination */
 152
 153         FCNVME_RJT_EXP_INSUF_RES        = 0x29,
 154         /* insufficient resources */
 155
 156         FCNVME_RJT_EXP_UNAB_DATA        = 0x2a,
 157         /* unable to supply requested data */
 158
 159         FCNVME_RJT_EXP_INV_LEN          = 0x2d,
 160         /* Invalid payload length */
 161 };
 162
 163 /* FCNVME_LSDESC_RJT */
 164 struct fcnvme_lsdesc_rjt {
 165         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 166         __be32  desc_len;
 167         u8      rsvd8;
 168
 169         /*
 170          * Reject reason and explanaction codes are generic
 171          * to ELs's from LS-3.
 172          */
 173         u8      reason_code;            /* fcnvme_ls_rjt_reason */
 174         u8      reason_explanation;     /* fcnvme_ls_rjt_explan */
 175
 176         u8      vendor;
 177         __be32  rsvd12;
 178 };
 179
 180
 181 #define FCNVME_ASSOC_HOSTNQN_LEN        256
 182 #define FCNVME_ASSOC_SUBNQN_LEN         256
 183
 184 /* FCNVME_LSDESC_CREATE_ASSOC_CMD */
 185 struct fcnvme_lsdesc_cr_assoc_cmd {
 186         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 187         __be32  desc_len;
 188         __be16  ersp_ratio;
 189         __be16  rsvd10;
 190         __be32  rsvd12[9];
 191         __be16  cntlid;
 192         __be16  sqsize;
 193         __be32  rsvd52;
 194         uuid_t  hostid;
 195         u8      hostnqn[FCNVME_ASSOC_HOSTNQN_LEN];
 196         u8      subnqn[FCNVME_ASSOC_SUBNQN_LEN];
 197         __be32  rsvd584[108];           /* pad to 1016 bytes,
 198                                          * which makes overall LS rqst
 199                                          * payload 1024 bytes
 200                                          */
 201 };
 202
 203 #define FCNVME_LSDESC_CRA_CMD_DESC_MINLEN       \
 204                 offsetof(struct fcnvme_lsdesc_cr_assoc_cmd, rsvd584)
 205
 206 #define FCNVME_LSDESC_CRA_CMD_DESC_MIN_DESCLEN  \
 207                 (FCNVME_LSDESC_CRA_CMD_DESC_MINLEN - \
 208                  offsetof(struct fcnvme_lsdesc_cr_assoc_cmd, ersp_ratio))
 209
 210
 211
 212 /* FCNVME_LSDESC_CREATE_CONN_CMD */
 213 struct fcnvme_lsdesc_cr_conn_cmd {
 214         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 215         __be32  desc_len;
 216         __be16  ersp_ratio;
 217         __be16  rsvd10;
 218         __be32  rsvd12[9];
 219         __be16  qid;
 220         __be16  sqsize;
 221         __be32  rsvd52;
 222 };
 223
 224 /* Disconnect Scope Values */
 225 enum {
 226         FCNVME_DISCONN_ASSOCIATION      = 0,
 227         FCNVME_DISCONN_CONNECTION       = 1,
 228 };
 229
 230 /* FCNVME_LSDESC_DISCONN_CMD */
 231 struct fcnvme_lsdesc_disconn_cmd {
 232         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 233         __be32  desc_len;
 234         u8      rsvd8[3];
 235         /* note: scope is really a 1 bit field */
 236         u8      scope;                  /* FCNVME_DISCONN_xxx */
 237         __be32  rsvd12;
 238         __be64  id;
 239 };
 240
 241 /* FCNVME_LSDESC_CONN_ID */
 242 struct fcnvme_lsdesc_conn_id {
 243         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 244         __be32  desc_len;
 245         __be64  connection_id;
 246 };
 247
 248 /* FCNVME_LSDESC_ASSOC_ID */
 249 struct fcnvme_lsdesc_assoc_id {
 250         __be32  desc_tag;               /* FCNVME_LSDESC_xxx */
 251         __be32  desc_len;
 252         __be64  association_id;
 253 };
 254
 255 /* r_ctl values */
 256 enum {
 257         FCNVME_RS_RCTL_DATA             = 1,
 258         FCNVME_RS_RCTL_XFER_RDY         = 5,
 259         FCNVME_RS_RCTL_RSP              = 8,
 260 };
 261
 262
 263 /* ********** start of Link Services ********** */
 264
 265
 266 /* FCNVME_LS_RJT */
 267 struct fcnvme_ls_rjt {
 268         struct fcnvme_ls_rqst_w0                w0;
 269         __be32                                  desc_list_len;
 270         struct fcnvme_lsdesc_rqst               rqst;
 271         struct fcnvme_lsdesc_rjt                rjt;
 272 };
 273
 274 /* FCNVME_LS_ACC */
 275 struct fcnvme_ls_acc_hdr {
 276         struct fcnvme_ls_rqst_w0                w0;
 277         __be32                                  desc_list_len;
 278         struct fcnvme_lsdesc_rqst               rqst;
 279         /* Followed by cmd-specific ACC descriptors, see next definitions */
 280 };
 281
 282 /* FCNVME_LS_CREATE_ASSOCIATION */
 283 struct fcnvme_ls_cr_assoc_rqst {
 284         struct fcnvme_ls_rqst_w0                w0;
 285         __be32                                  desc_list_len;
 286         struct fcnvme_lsdesc_cr_assoc_cmd       assoc_cmd;
 287 };
 288
 289 #define FCNVME_LSDESC_CRA_RQST_MINLEN   \
 290                 (offsetof(struct fcnvme_ls_cr_assoc_rqst, assoc_cmd) + \
 291                         FCNVME_LSDESC_CRA_CMD_DESC_MINLEN)
 292
 293 #define FCNVME_LSDESC_CRA_RQST_MIN_LISTLEN      \
 294                 FCNVME_LSDESC_CRA_CMD_DESC_MINLEN
 295
 296
 297 struct fcnvme_ls_cr_assoc_acc {
 298         struct fcnvme_ls_acc_hdr                hdr;
 299         struct fcnvme_lsdesc_assoc_id           associd;
 300         struct fcnvme_lsdesc_conn_id            connectid;
 301 };
 302
 303
 304 /* FCNVME_LS_CREATE_CONNECTION */
 305 struct fcnvme_ls_cr_conn_rqst {
 306         struct fcnvme_ls_rqst_w0                w0;
 307         __be32                                  desc_list_len;
 308         struct fcnvme_lsdesc_assoc_id           associd;
 309         struct fcnvme_lsdesc_cr_conn_cmd        connect_cmd;
 310 };
 311
 312 struct fcnvme_ls_cr_conn_acc {
 313         struct fcnvme_ls_acc_hdr                hdr;
 314         struct fcnvme_lsdesc_conn_id            connectid;
 315 };
 316
 317 /* FCNVME_LS_DISCONNECT */
 318 struct fcnvme_ls_disconnect_rqst {
 319         struct fcnvme_ls_rqst_w0                w0;
 320         __be32                                  desc_list_len;
 321         struct fcnvme_lsdesc_assoc_id           associd;
 322         struct fcnvme_lsdesc_disconn_cmd        discon_cmd;
 323 };
 324
 325 struct fcnvme_ls_disconnect_acc {
 326         struct fcnvme_ls_acc_hdr                hdr;
 327 };
 328
 329
 330 /*
 331  * Yet to be defined in FC-NVME:
 332  */
 333 #define NVME_FC_CONNECT_TIMEOUT_SEC     2               /* 2 seconds */
 334 #define NVME_FC_LS_TIMEOUT_SEC          2               /* 2 seconds */
 335 #define NVME_FC_TGTOP_TIMEOUT_SEC       2               /* 2 seconds */
 336
 337
 338 #endif /* _NVME_FC_H */