drivers/scsi/snic/snic_fwint.h

   1 /*
   2  * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
   3  *
   4  * This program is free software; you may redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; version 2 of the License.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   9  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  10  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  11  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  12  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  13  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  14  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  15  * SOFTWARE.
  16  */
  17
  18 #ifndef __SNIC_FWINT_H
  19 #define __SNIC_FWINT_H
  20
  21 #define SNIC_CDB_LEN    32      /* SCSI CDB size 32, can be used for 16 bytes */
  22 #define LUN_ADDR_LEN    8
  23
  24 /*
  25  * Command entry type
  26  */
  27 enum snic_io_type {
  28         /*
  29          * Initiator request types
  30          */
  31         SNIC_REQ_REPORT_TGTS = 0x2,     /* Report Targets */
  32         SNIC_REQ_ICMND,                 /* Initiator command for SCSI IO */
  33         SNIC_REQ_ITMF,                  /* Initiator command for Task Mgmt */
  34         SNIC_REQ_HBA_RESET,             /* SNIC Reset */
  35         SNIC_REQ_EXCH_VER,              /* Exchange Version Information */
  36         SNIC_REQ_TGT_INFO,              /* Backend/Target Information */
  37         SNIC_REQ_BOOT_LUNS,
  38
  39         /*
  40          * Response type
  41          */
  42         SNIC_RSP_REPORT_TGTS_CMPL = 0x12,/* Report Targets Completion */
  43         SNIC_RSP_ICMND_CMPL,            /* SCSI IO Completion */
  44         SNIC_RSP_ITMF_CMPL,             /* Task Management Completion */
  45         SNIC_RSP_HBA_RESET_CMPL,        /* SNIC Reset Completion */
  46         SNIC_RSP_EXCH_VER_CMPL,         /* Exchange Version Completion*/
  47         SNIC_RSP_BOOT_LUNS_CMPL,
  48
  49         /*
  50          * Misc Request types
  51          */
  52         SNIC_MSG_ACK = 0x80,            /* Ack: snic_notify_msg */
  53         SNIC_MSG_ASYNC_EVNOTIFY,        /* Asynchronous Event Notification */
  54 }; /* end of enum snic_io_type */
  55
  56
  57 /*
  58  * Header status codes from firmware
  59  */
  60 enum snic_io_status {
  61         SNIC_STAT_IO_SUCCESS = 0,       /* request was successful */
  62
  63         /*
  64          * If a request to the fw is rejected, the original request header
  65          * will be returned with the status set to one of the following:
  66          */
  67         SNIC_STAT_INVALID_HDR,  /* header contains invalid data */
  68         SNIC_STAT_OUT_OF_RES,   /* out of resources to complete request */
  69         SNIC_STAT_INVALID_PARM, /* some parameter in request is not valid */
  70         SNIC_STAT_REQ_NOT_SUP,  /* req type is not supported */
  71         SNIC_STAT_IO_NOT_FOUND, /* requested IO was not found */
  72
  73         /*
  74          * Once a request is processed, the fw will usually return
  75          * a cmpl message type. In cases where errors occurred,
  76          * the header status would be filled in with one of the following:
  77          */
  78         SNIC_STAT_ABORTED,              /* req was aborted */
  79         SNIC_STAT_TIMEOUT,              /* req was timed out */
  80         SNIC_STAT_SGL_INVALID,          /* req was aborted due to sgl error */
  81         SNIC_STAT_DATA_CNT_MISMATCH,    /*recv/sent more/less data than expec */
  82         SNIC_STAT_FW_ERR,               /* req was terminated due to fw error */
  83         SNIC_STAT_ITMF_REJECT,          /* itmf req was rejected by target */
  84         SNIC_STAT_ITMF_FAIL,            /* itmf req was failed */
  85         SNIC_STAT_ITMF_INCORRECT_LUN,   /* itmf req has incorrect LUN id*/
  86         SNIC_STAT_CMND_REJECT,          /* req was invalid and rejected */
  87         SNIC_STAT_DEV_OFFLINE,          /* req sent to offline device */
  88         SNIC_STAT_NO_BOOTLUN,
  89         SNIC_STAT_SCSI_ERR,             /* SCSI error returned by Target. */
  90         SNIC_STAT_NOT_READY,            /* sNIC Subsystem is not ready */
  91         SNIC_STAT_FATAL_ERROR,          /* sNIC is in unrecoverable state */
  92 }; /* end of enum snic_io_status */
  93
  94 /*
  95  * snic_io_hdr : host <--> firmare
  96  *
  97  * for any other message that will be queued to firmware should
  98  *  have the following request header
  99  */
 100 struct snic_io_hdr {
 101         __le32  hid;
 102         __le32  cmnd_id;        /* tag here */
 103         ulong   init_ctx;       /* initiator context */
 104         u8      type;           /* request/response type */
 105         u8      status;         /* header status entry */
 106         u8      protocol;       /* Protocol specific, may needed for RoCE*/
 107         u8      flags;
 108         __le16  sg_cnt;
 109         u16     resvd;
 110 };
 111
 112 /* auxillary funciton for encoding the snic_io_hdr */
 113 static inline void
 114 snic_io_hdr_enc(struct snic_io_hdr *hdr, u8 typ, u8 status, u32 id, u32 hid,
 115                 u16 sg_cnt, ulong ctx)
 116 {
 117         hdr->type = typ;
 118         hdr->status = status;
 119         hdr->protocol = 0;
 120         hdr->hid = cpu_to_le32(hid);
 121         hdr->cmnd_id = cpu_to_le32(id);
 122         hdr->sg_cnt = cpu_to_le16(sg_cnt);
 123         hdr->init_ctx = ctx;
 124         hdr->flags = 0;
 125 }
 126
 127 /* auxillary funciton for decoding the snic_io_hdr */
 128 static inline void
 129 snic_io_hdr_dec(struct snic_io_hdr *hdr, u8 *typ, u8 *stat, u32 *cmnd_id,
 130                 u32 *hid, ulong *ctx)
 131 {
 132         *typ = hdr->type;
 133         *stat = hdr->status;
 134         *hid = le32_to_cpu(hdr->hid);
 135         *cmnd_id = le32_to_cpu(hdr->cmnd_id);
 136         *ctx = hdr->init_ctx;
 137 }
 138
 139 /*
 140  * snic_host_info: host -> firmware
 141  *
 142  * Used for sending host information to firmware, and request fw version
 143  */
 144 struct snic_exch_ver_req {
 145         __le32  drvr_ver;       /* for debugging, when fw dump captured */
 146         __le32  os_type;        /* for OS specific features */
 147 };
 148
 149 /*
 150  * os_type flags
 151  * Bit 0-7 : OS information
 152  * Bit 8-31: Feature/Capability Information
 153  */
 154 #define SNIC_OS_LINUX   0x1
 155 #define SNIC_OS_WIN     0x2
 156 #define SNIC_OS_ESX     0x3
 157
 158 /*
 159  * HBA Capabilities
 160  * Bit 1: Reserved.
 161  * Bit 2: Dynamic Discovery of LUNs.
 162  * Bit 3: Async event notifications on on tgt online/offline events.
 163  * Bit 4: IO timeout support in FW.
 164  * Bit 5-31: Reserved.
 165  */
 166 #define SNIC_HBA_CAP_DDL        0x02    /* Supports Dynamic Discovery of LUNs */
 167 #define SNIC_HBA_CAP_AEN        0x04    /* Supports Async Event Noitifcation */
 168 #define SNIC_HBA_CAP_TMO        0x08    /* Supports IO timeout in FW */
 169
 170 /*
 171  * snic_exch_ver_rsp : firmware -> host
 172  *
 173  * Used by firmware to send response to version request
 174  */
 175 struct snic_exch_ver_rsp {
 176         __le32  version;
 177         __le32  hid;
 178         __le32  max_concur_ios;         /* max concurrent ios */
 179         __le32  max_sgs_per_cmd;        /* max sgls per IO */
 180         __le32  max_io_sz;              /* max io size supported */
 181         __le32  hba_cap;                /* hba capabilities */
 182         __le32  max_tgts;               /* max tgts supported */
 183         __le16  io_timeout;             /* FW extended timeout */
 184         u16     rsvd;
 185 };
 186
 187
 188 /*
 189  * snic_report_tgts : host -> firmware request
 190  *
 191  * Used by the host to request list of targets
 192  */
 193 struct snic_report_tgts {
 194         __le16  sg_cnt;
 195         __le16  flags;          /* specific flags from fw */
 196         u8      _resvd[4];
 197         __le64  sg_addr;        /* Points to SGL */
 198         __le64  sense_addr;
 199 };
 200
 201 enum snic_type {
 202         SNIC_NONE = 0x0,
 203         SNIC_DAS,
 204         SNIC_SAN,
 205 };
 206
 207
 208 /* Report Target Response */
 209 enum snic_tgt_type {
 210         SNIC_TGT_NONE = 0x0,
 211         SNIC_TGT_DAS,   /* DAS Target */
 212         SNIC_TGT_SAN,   /* SAN Target */
 213 };
 214
 215 /* target id format */
 216 struct snic_tgt_id {
 217         __le32  tgt_id;         /* target id */
 218         __le16  tgt_type;       /* tgt type */
 219         __le16  vnic_id;        /* corresponding vnic id */
 220 };
 221
 222 /*
 223  * snic_report_tgts_cmpl : firmware -> host response
 224  *
 225  * Used by firmware to send response to Report Targets request
 226  */
 227 struct snic_report_tgts_cmpl {
 228         __le32  tgt_cnt;        /* Number of Targets accessible */
 229         u32     _resvd;
 230 };
 231
 232 /*
 233  * Command flags
 234  *
 235  * Bit 0: Read flags
 236  * Bit 1: Write flag
 237  * Bit 2: ESGL - sg/esg array contains extended sg
 238  *        ESGE - is a host buffer contains sg elements
 239  * Bit 3-4: Task Attributes
 240  *              00b - simple
 241  *              01b - head of queue
 242  *              10b - ordered
 243  * Bit 5-7: Priority - future use
 244  * Bit 8-15: Reserved
 245  */
 246
 247 #define SNIC_ICMND_WR           0x01    /* write command */
 248 #define SNIC_ICMND_RD           0x02    /* read command */
 249 #define SNIC_ICMND_ESGL         0x04    /* SGE/ESGE array contains valid data*/
 250
 251 /*
 252  * Priority/Task Attribute settings
 253  */
 254 #define SNIC_ICMND_TSK_SHIFT            2       /* task attr starts at bit 2 */
 255 #define SNIC_ICMND_TSK_MASK(x)          ((x>>SNIC_ICMND_TSK_SHIFT) & ~(0xffff))
 256 #define SNIC_ICMND_TSK_SIMPLE           0       /* simple task attr */
 257 #define SNIC_ICMND_TSK_HEAD_OF_QUEUE    1       /* head of qeuue task attr */
 258 #define SNIC_ICMND_TSK_ORDERED          2       /* ordered task attr */
 259
 260 #define SNIC_ICMND_PRI_SHIFT            5       /* prio val starts at bit 5 */
 261
 262 /*
 263  * snic_icmnd : host-> firmware request
 264  *
 265  * used for sending out an initiator SCSI 16/32-byte command
 266  */
 267 struct snic_icmnd {
 268         __le16  sg_cnt;         /* Number of SG Elements */
 269         __le16  flags;          /* flags */
 270         __le32  sense_len;      /* Sense buffer length */
 271         __le64  tgt_id;         /* Destination Target ID */
 272         __le64  lun_id;         /* Destination LUN ID */
 273         u8      cdb_len;
 274         u8      _resvd;
 275         __le16  time_out;       /* ms time for Res allocations fw to handle io*/
 276         __le32  data_len;       /* Total number of bytes to be transferred */
 277         u8      cdb[SNIC_CDB_LEN];
 278         __le64  sg_addr;        /* Points to SG List */
 279         __le64  sense_addr;     /* Sense buffer address */
 280 };
 281
 282
 283 /* Response flags */
 284 /* Bit 0: Under run
 285  * Bit 1: Over Run
 286  * Bit 2-7: Reserved
 287  */
 288 #define SNIC_ICMND_CMPL_UNDR_RUN        0x01    /* resid under and valid */
 289 #define SNIC_ICMND_CMPL_OVER_RUN        0x02    /* resid over and valid */
 290
 291 /*
 292  * snic_icmnd_cmpl: firmware -> host response
 293  *
 294  * Used for sending the host a response to an icmnd (initiator command)
 295  */
 296 struct snic_icmnd_cmpl {
 297         u8      scsi_status;    /* value as per SAM */
 298         u8      flags;
 299         __le16  sense_len;      /* Sense Length */
 300         __le32  resid;          /* Residue : # bytes under or over run */
 301 };
 302
 303 /*
 304  * snic_itmf: host->firmware request
 305  *
 306  * used for requesting the firmware to abort a request and/or send out
 307  * a task management function
 308  *
 309  * the req_id field is valid in case of abort task and clear task
 310  */
 311 struct snic_itmf {
 312         u8      tm_type;        /* SCSI Task Management request */
 313         u8      resvd;
 314         __le16  flags;          /* flags */
 315         __le32  req_id;         /* Command id of snic req to be aborted */
 316         __le64  tgt_id;         /* Target ID */
 317         __le64  lun_id;         /* Destination LUN ID */
 318         __le16  timeout;        /* in sec */
 319 };
 320
 321 /*
 322  * Task Management Request
 323  */
 324 enum snic_itmf_tm_type {
 325         SNIC_ITMF_ABTS_TASK = 0x01,     /* Abort Task */
 326         SNIC_ITMF_ABTS_TASK_SET,        /* Abort Task Set */
 327         SNIC_ITMF_CLR_TASK,             /* Clear Task */
 328         SNIC_ITMF_CLR_TASKSET,          /* Clear Task Set */
 329         SNIC_ITMF_LUN_RESET,            /* Lun Reset */
 330         SNIC_ITMF_ABTS_TASK_TERM,       /* Supported for SAN Targets */
 331 };
 332
 333 /*
 334  * snic_itmf_cmpl: firmware -> host resposne
 335  *
 336  * used for sending the host a response for a itmf request
 337  */
 338 struct snic_itmf_cmpl {
 339         __le32  nterminated;    /* # IOs terminated as a result of tmf */
 340         u8      flags;          /* flags */
 341         u8      _resvd[3];
 342 };
 343
 344 /*
 345  * itmfl_cmpl flags
 346  * Bit 0 : 1 - Num terminated field valid
 347  * Bit 1 - 7 : Reserved
 348  */
 349 #define SNIC_NUM_TERM_VALID     0x01    /* Number of IOs terminated */
 350
 351 /*
 352  * snic_hba_reset: host -> firmware request
 353  *
 354  * used for requesting firmware to reset snic
 355  */
 356 struct snic_hba_reset {
 357         __le16  flags;          /* flags */
 358         u8      _resvd[6];
 359 };
 360
 361 /*
 362  * snic_hba_reset_cmpl: firmware -> host response
 363  *
 364  * Used by firmware to respond to the host's hba reset request
 365  */
 366 struct snic_hba_reset_cmpl {
 367         u8      flags;          /* flags : more info needs to be added*/
 368         u8      _resvd[7];
 369 };
 370
 371 /*
 372  * snic_notify_msg: firmware -> host response
 373  *
 374  * Used by firmware to notify host of the last work queue entry received
 375  */
 376 struct snic_notify_msg {
 377         __le32  wqe_num;        /* wq entry number */
 378         u8      flags;          /* flags, macros */
 379         u8      _resvd[4];
 380 };
 381
 382
 383 #define SNIC_EVDATA_LEN         24      /* in bytes */
 384 /* snic_async_evnotify: firmware -> host notification
 385  *
 386  * Used by firmware to notify the host about configuration/state changes
 387  */
 388 struct snic_async_evnotify {
 389         u8      FLS_EVENT_DESC;
 390         u8      vnic;                   /* vnic id */
 391         u8      _resvd[2];
 392         __le32  ev_id;                  /* Event ID */
 393         u8      ev_data[SNIC_EVDATA_LEN]; /* Event Data */
 394         u8      _resvd2[4];
 395 };
 396
 397 /* async event flags */
 398 enum snic_ev_type {
 399         SNIC_EV_TGT_OFFLINE = 0x01, /* Target Offline, PL contains TGT ID */
 400         SNIC_EV_TGT_ONLINE,     /* Target Online, PL contains TGT ID */
 401         SNIC_EV_LUN_OFFLINE,    /* LUN Offline, PL contains LUN ID */
 402         SNIC_EV_LUN_ONLINE,     /* LUN Online, PL contains LUN ID */
 403         SNIC_EV_CONF_CHG,       /* Dev Config/Attr Change Event */
 404         SNIC_EV_TGT_ADDED,      /* Target Added */
 405         SNIC_EV_TGT_DELTD,      /* Target Del'd, PL contains TGT ID */
 406         SNIC_EV_LUN_ADDED,      /* LUN Added */
 407         SNIC_EV_LUN_DELTD,      /* LUN Del'd, PL cont. TGT & LUN ID */
 408
 409         SNIC_EV_DISC_CMPL = 0x10, /* Discovery Completed Event */
 410 };
 411
 412
 413 #define SNIC_HOST_REQ_LEN       128     /*Exp length of host req, wq desc sz*/
 414 /* Payload 88 bytes = 128 - 24 - 16 */
 415 #define SNIC_HOST_REQ_PAYLOAD   ((int)(SNIC_HOST_REQ_LEN -              \
 416                                         sizeof(struct snic_io_hdr) -    \
 417                                         (2 * sizeof(u64))))
 418
 419 /*
 420  * snic_host_req: host -> firmware request
 421  *
 422  * Basic structure for all snic requests that are sent from the host to
 423  * firmware. They are 128 bytes in size.
 424  */
 425 struct snic_host_req {
 426         u64     ctrl_data[2];   /*16 bytes - Control Data */
 427         struct snic_io_hdr hdr;
 428         union {
 429                 /*
 430                  * Entry specific space, last byte contains color
 431                  */
 432                 u8      buf[SNIC_HOST_REQ_PAYLOAD];
 433
 434                 /*
 435                  * Exchange firmware version
 436                  */
 437                 struct snic_exch_ver_req        exch_ver;
 438
 439                 /* report targets */
 440                 struct snic_report_tgts         rpt_tgts;
 441
 442                 /* io request */
 443                 struct snic_icmnd               icmnd;
 444
 445                 /* task management request */
 446                 struct snic_itmf                itmf;
 447
 448                 /* hba reset */
 449                 struct snic_hba_reset           reset;
 450         } u;
 451 }; /* end of snic_host_req structure */
 452
 453
 454 #define SNIC_FW_REQ_LEN         64 /* Expected length of fw req */
 455 struct snic_fw_req {
 456         struct snic_io_hdr hdr;
 457         union {
 458                 /*
 459                  * Entry specific space, last byte contains color
 460                  */
 461                 u8      buf[SNIC_FW_REQ_LEN - sizeof(struct snic_io_hdr)];
 462
 463                 /* Exchange Version Response */
 464                 struct snic_exch_ver_rsp        exch_ver_cmpl;
 465
 466                 /* Report Targets Response */
 467                 struct snic_report_tgts_cmpl    rpt_tgts_cmpl;
 468
 469                 /* scsi response */
 470                 struct snic_icmnd_cmpl          icmnd_cmpl;
 471
 472                 /* task management response */
 473                 struct snic_itmf_cmpl           itmf_cmpl;
 474
 475                 /* hba reset response */
 476                 struct snic_hba_reset_cmpl      reset_cmpl;
 477
 478                 /* notify message */
 479                 struct snic_notify_msg          ack;
 480
 481                 /* async notification event */
 482                 struct snic_async_evnotify      async_ev;
 483
 484         } u;
 485 }; /* end of snic_fw_req structure */
 486
 487 /*
 488  * Auxillary macro to verify specific snic req/cmpl structures
 489  * to ensure that it will be aligned to 64 bit, and not using
 490  * color bit field
 491  */
 492 #define VERIFY_REQ_SZ(x)
 493 #define VERIFY_CMPL_SZ(x)
 494
 495 /*
 496  * Access routines to encode and decode the color bit, which is the most
 497  * significant bit of the structure.
 498  */
 499 static inline void
 500 snic_color_enc(struct snic_fw_req *req, u8 color)
 501 {
 502         u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
 503
 504         if (color)
 505                 *c |= 0x80;
 506         else
 507                 *c &= ~0x80;
 508 }
 509
 510 static inline void
 511 snic_color_dec(struct snic_fw_req *req, u8 *color)
 512 {
 513         u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
 514
 515         *color = *c >> 7;
 516
 517         /* Make sure color bit is read from desc *before* other fields
 518          * are read from desc. Hardware guarantees color bit is last
 519          * bit (byte) written. Adding the rmb() prevents the compiler
 520          * and/or CPU from reordering the reads which would potentially
 521          * result in reading stale values.
 522          */
 523         rmb();
 524 }
 525 #endif /* end of __SNIC_FWINT_H */