include/scsi/osd_initiator.h

   1 /*
   2  * osd_initiator.h - OSD initiator API definition
   3  *
   4  * Copyright (C) 2008 Panasas Inc.  All rights reserved.
   5  *
   6  * Authors:
   7  *   Boaz Harrosh <bharrosh@panasas.com>
   8  *   Benny Halevy <bhalevy@panasas.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2
  12  *
  13  */
  14 #ifndef __OSD_INITIATOR_H__
  15 #define __OSD_INITIATOR_H__
  16
  17 #include "osd_protocol.h"
  18 #include "osd_types.h"
  19
  20 #include <linux/blkdev.h>
  21 #include <scsi/scsi_device.h>
  22
  23 /* Note: "NI" in comments below means "Not Implemented yet" */
  24
  25 /* Configure of code:
  26  * #undef if you *don't* want OSD v1 support in runtime.
  27  * If #defined the initiator will dynamically configure to encode OSD v1
  28  * CDB's if the target is detected to be OSD v1 only.
  29  * OSD v2 only commands, options, and attributes will be ignored if target
  30  * is v1 only.
  31  * If #defined will result in bigger/slower code (OK Slower maybe not)
  32  * Q: Should this be CONFIG_SCSI_OSD_VER1_SUPPORT and set from Kconfig?
  33  */
  34 #define OSD_VER1_SUPPORT y
  35
  36 enum osd_std_version {
  37         OSD_VER_NONE = 0,
  38         OSD_VER1 = 1,
  39         OSD_VER2 = 2,
  40 };
  41
  42 /*
  43  * Object-based Storage Device.
  44  * This object represents an OSD device.
  45  * It is not a full linux device in any way. It is only
  46  * a place to hang resources associated with a Linux
  47  * request Q and some default properties.
  48  */
  49 struct osd_dev {
  50         struct scsi_device *scsi_device;
  51         struct file *file;
  52         unsigned def_timeout;
  53
  54 #ifdef OSD_VER1_SUPPORT
  55         enum osd_std_version version;
  56 #endif
  57 };
  58
  59 /* Retrieve/return osd_dev(s) for use by Kernel clients */
  60 struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/
  61 void osduld_put_device(struct osd_dev *od);
  62
  63 /* Add/remove test ioctls from external modules */
  64 typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
  65 int osduld_register_test(unsigned ioctl, do_test_fn *do_test);
  66 void osduld_unregister_test(unsigned ioctl);
  67
  68 /* These are called by uld at probe time */
  69 void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device);
  70 void osd_dev_fini(struct osd_dev *od);
  71
  72 /* some hi level device operations */
  73 int osd_auto_detect_ver(struct osd_dev *od, void *caps);    /* GFP_KERNEL */
  74 static inline struct request_queue *osd_request_queue(struct osd_dev *od)
  75 {
  76         return od->scsi_device->request_queue;
  77 }
  78
  79 /* we might want to use function vector in the future */
  80 static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v)
  81 {
  82 #ifdef OSD_VER1_SUPPORT
  83         od->version = v;
  84 #endif
  85 }
  86
  87 struct osd_request;
  88 typedef void (osd_req_done_fn)(struct osd_request *or, void *private);
  89
  90 struct osd_request {
  91         struct osd_cdb cdb;
  92         struct osd_data_out_integrity_info out_data_integ;
  93         struct osd_data_in_integrity_info in_data_integ;
  94
  95         struct osd_dev *osd_dev;
  96         struct request *request;
  97
  98         struct _osd_req_data_segment {
  99                 void *buff;
 100                 unsigned alloc_size; /* 0 here means: don't call kfree */
 101                 unsigned total_bytes;
 102         } set_attr, enc_get_attr, get_attr;
 103
 104         struct _osd_io_info {
 105                 struct bio *bio;
 106                 u64 total_bytes;
 107                 struct request *req;
 108                 struct _osd_req_data_segment *last_seg;
 109                 u8 *pad_buff;
 110         } out, in;
 111
 112         gfp_t alloc_flags;
 113         unsigned timeout;
 114         unsigned retries;
 115         u8 sense[OSD_MAX_SENSE_LEN];
 116         enum osd_attributes_mode attributes_mode;
 117
 118         osd_req_done_fn *async_done;
 119         void *async_private;
 120         int async_error;
 121 };
 122
 123 /* OSD Version control */
 124 static inline bool osd_req_is_ver1(struct osd_request *or)
 125 {
 126 #ifdef OSD_VER1_SUPPORT
 127         return or->osd_dev->version == OSD_VER1;
 128 #else
 129         return false;
 130 #endif
 131 }
 132
 133 /*
 134  * How to use the osd library:
 135  *
 136  * osd_start_request
 137  *      Allocates a request.
 138  *
 139  * osd_req_*
 140  *      Call one of, to encode the desired operation.
 141  *
 142  * osd_add_{get,set}_attr
 143  *      Optionally add attributes to the CDB, list or page mode.
 144  *
 145  * osd_finalize_request
 146  *      Computes final data out/in offsets and signs the request,
 147  *      making it ready for execution.
 148  *
 149  * osd_execute_request
 150  *      May be called to execute it through the block layer. Other wise submit
 151  *      the associated block request in some other way.
 152  *
 153  * After execution:
 154  * osd_req_decode_sense
 155  *      Decodes sense information to verify execution results.
 156  *
 157  * osd_req_decode_get_attr
 158  *      Retrieve osd_add_get_attr_list() values if used.
 159  *
 160  * osd_end_request
 161  *      Must be called to deallocate the request.
 162  */
 163
 164 /**
 165  * osd_start_request - Allocate and initialize an osd_request
 166  *
 167  * @osd_dev:    OSD device that holds the scsi-device and default values
 168  *              that the request is associated with.
 169  * @gfp:        The allocation flags to use for request allocation, and all
 170  *              subsequent allocations. This will be stored at
 171  *              osd_request->alloc_flags, can be changed by user later
 172  *
 173  * Allocate osd_request and initialize all members to the
 174  * default/initial state.
 175  */
 176 struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp);
 177
 178 enum osd_req_options {
 179         OSD_REQ_FUA = 0x08,     /* Force Unit Access */
 180         OSD_REQ_DPO = 0x10,     /* Disable Page Out */
 181
 182         OSD_REQ_BYPASS_TIMESTAMPS = 0x80,
 183 };
 184
 185 /**
 186  * osd_finalize_request - Sign request and prepare request for execution
 187  *
 188  * @or:         osd_request to prepare
 189  * @options:    combination of osd_req_options bit flags or 0.
 190  * @cap:        A Pointer to an OSD_CAP_LEN bytes buffer that is received from
 191  *              The security manager as capabilities for this cdb.
 192  * @cap_key:    The cryptographic key used to sign the cdb/data. Can be null
 193  *              if NOSEC is used.
 194  *
 195  * The actual request and bios are only allocated here, so are the get_attr
 196  * buffers that will receive the returned attributes. Copy's @cap to cdb.
 197  * Sign the cdb/data with @cap_key.
 198  */
 199 int osd_finalize_request(struct osd_request *or,
 200         u8 options, const void *cap, const u8 *cap_key);
 201
 202 /**
 203  * osd_execute_request - Execute the request synchronously through block-layer
 204  *
 205  * @or:         osd_request to Executed
 206  *
 207  * Calls blk_execute_rq to q the command and waits for completion.
 208  */
 209 int osd_execute_request(struct osd_request *or);
 210
 211 /**
 212  * osd_execute_request_async - Execute the request without waitting.
 213  *
 214  * @or:                      - osd_request to Executed
 215  * @done: (Optional)         - Called at end of execution
 216  * @private:                 - Will be passed to @done function
 217  *
 218  * Calls blk_execute_rq_nowait to queue the command. When execution is done
 219  * optionally calls @done with @private as parameter. @or->async_error will
 220  * have the return code
 221  */
 222 int osd_execute_request_async(struct osd_request *or,
 223         osd_req_done_fn *done, void *private);
 224
 225 /**
 226  * osd_req_decode_sense_full - Decode sense information after execution.
 227  *
 228  * @or:           - osd_request to examine
 229  * @osi           - Recievs a more detailed error report information (optional).
 230  * @silent        - Do not print to dmsg (Even if enabled)
 231  * @bad_obj_list  - Some commands act on multiple objects. Failed objects will
 232  *                  be recieved here (optional)
 233  * @max_obj       - Size of @bad_obj_list.
 234  * @bad_attr_list - List of failing attributes (optional)
 235  * @max_attr      - Size of @bad_attr_list.
 236  *
 237  * After execution, sense + return code can be analyzed using this function. The
 238  * return code is the final disposition on the error. So it is possible that a
 239  * CHECK_CONDITION was returned from target but this will return NO_ERROR, for
 240  * example on recovered errors. All parameters are optional if caller does
 241  * not need any returned information.
 242  * Note: This function will also dump the error to dmsg according to settings
 243  * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the
 244  * command would routinely fail, to not spam the dmsg file.
 245  */
 246 struct osd_sense_info {
 247         int key;                /* one of enum scsi_sense_keys */
 248         int additional_code ;   /* enum osd_additional_sense_codes */
 249         union { /* Sense specific information */
 250                 u16 sense_info;
 251                 u16 cdb_field_offset;   /* scsi_invalid_field_in_cdb */
 252         };
 253         union { /* Command specific information */
 254                 u64 command_info;
 255         };
 256
 257         u32 not_initiated_command_functions; /* osd_command_functions_bits */
 258         u32 completed_command_functions; /* osd_command_functions_bits */
 259         struct osd_obj_id obj;
 260         struct osd_attr attr;
 261 };
 262
 263 int osd_req_decode_sense_full(struct osd_request *or,
 264         struct osd_sense_info *osi, bool silent,
 265         struct osd_obj_id *bad_obj_list, int max_obj,
 266         struct osd_attr *bad_attr_list, int max_attr);
 267
 268 static inline int osd_req_decode_sense(struct osd_request *or,
 269         struct osd_sense_info *osi)
 270 {
 271         return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0);
 272 }
 273
 274 /**
 275  * osd_end_request - return osd_request to free store
 276  *
 277  * @or:         osd_request to free
 278  *
 279  * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.)
 280  */
 281 void osd_end_request(struct osd_request *or);
 282
 283 /*
 284  * CDB Encoding
 285  *
 286  * Note: call only one of the following methods.
 287  */
 288
 289 /*
 290  * Device commands
 291  */
 292 void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */
 293 void osd_req_set_master_key(struct osd_request *or, ...);/* NI */
 294
 295 void osd_req_format(struct osd_request *or, u64 tot_capacity);
 296
 297 /* list all partitions
 298  * @list header must be initialized to zero on first run.
 299  *
 300  * Call osd_is_obj_list_done() to find if we got the complete list.
 301  */
 302 int osd_req_list_dev_partitions(struct osd_request *or,
 303         osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem);
 304
 305 void osd_req_flush_obsd(struct osd_request *or,
 306         enum osd_options_flush_scope_values);
 307
 308 void osd_req_perform_scsi_command(struct osd_request *or,
 309         const u8 *cdb, ...);/* NI */
 310 void osd_req_task_management(struct osd_request *or, ...);/* NI */
 311
 312 /*
 313  * Partition commands
 314  */
 315 void osd_req_create_partition(struct osd_request *or, osd_id partition);
 316 void osd_req_remove_partition(struct osd_request *or, osd_id partition);
 317
 318 void osd_req_set_partition_key(struct osd_request *or,
 319         osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE],
 320         u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */
 321
 322 /* list all collections in the partition
 323  * @list header must be init to zero on first run.
 324  *
 325  * Call osd_is_obj_list_done() to find if we got the complete list.
 326  */
 327 int osd_req_list_partition_collections(struct osd_request *or,
 328         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
 329         unsigned nelem);
 330
 331 /* list all objects in the partition
 332  * @list header must be init to zero on first run.
 333  *
 334  * Call osd_is_obj_list_done() to find if we got the complete list.
 335  */
 336 int osd_req_list_partition_objects(struct osd_request *or,
 337         osd_id partition, osd_id initial_id, struct osd_obj_id_list *list,
 338         unsigned nelem);
 339
 340 void osd_req_flush_partition(struct osd_request *or,
 341         osd_id partition, enum osd_options_flush_scope_values);
 342
 343 /*
 344  * Collection commands
 345  */
 346 void osd_req_create_collection(struct osd_request *or,
 347         const struct osd_obj_id *);/* NI */
 348 void osd_req_remove_collection(struct osd_request *or,
 349         const struct osd_obj_id *);/* NI */
 350
 351 /* list all objects in the collection */
 352 int osd_req_list_collection_objects(struct osd_request *or,
 353         const struct osd_obj_id *, osd_id initial_id,
 354         struct osd_obj_id_list *list, unsigned nelem);
 355
 356 /* V2 only filtered list of objects in the collection */
 357 void osd_req_query(struct osd_request *or, ...);/* NI */
 358
 359 void osd_req_flush_collection(struct osd_request *or,
 360         const struct osd_obj_id *, enum osd_options_flush_scope_values);
 361
 362 void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */
 363 void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */
 364
 365 /*
 366  * Object commands
 367  */
 368 void osd_req_create_object(struct osd_request *or, struct osd_obj_id *);
 369 void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *);
 370
 371 void osd_req_write(struct osd_request *or,
 372         const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
 373 int osd_req_write_kern(struct osd_request *or,
 374         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
 375 void osd_req_append(struct osd_request *or,
 376         const struct osd_obj_id *, struct bio *data_out);/* NI */
 377 void osd_req_create_write(struct osd_request *or,
 378         const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */
 379 void osd_req_clear(struct osd_request *or,
 380         const struct osd_obj_id *, u64 offset, u64 len);/* NI */
 381 void osd_req_punch(struct osd_request *or,
 382         const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */
 383
 384 void osd_req_flush_object(struct osd_request *or,
 385         const struct osd_obj_id *, enum osd_options_flush_scope_values,
 386         /*V2*/ u64 offset, /*V2*/ u64 len);
 387
 388 void osd_req_read(struct osd_request *or,
 389         const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len);
 390 int osd_req_read_kern(struct osd_request *or,
 391         const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
 392
 393 /*
 394  * Root/Partition/Collection/Object Attributes commands
 395  */
 396
 397 /* get before set */
 398 void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *);
 399
 400 /* set before get */
 401 void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *);
 402
 403 /*
 404  * Attributes appended to most commands
 405  */
 406
 407 /* Attributes List mode (or V2 CDB) */
 408   /*
 409    * TODO: In ver2 if at finalize time only one attr was set and no gets,
 410    * then the Attributes CDB mode is used automatically to save IO.
 411    */
 412
 413 /* set a list of attributes. */
 414 int osd_req_add_set_attr_list(struct osd_request *or,
 415         const struct osd_attr *, unsigned nelem);
 416
 417 /* get a list of attributes */
 418 int osd_req_add_get_attr_list(struct osd_request *or,
 419         const struct osd_attr *, unsigned nelem);
 420
 421 /*
 422  * Attributes list decoding
 423  * Must be called after osd_request.request was executed
 424  * It is called in a loop to decode the returned get_attr
 425  * (see osd_add_get_attr)
 426  */
 427 int osd_req_decode_get_attr_list(struct osd_request *or,
 428         struct osd_attr *, int *nelem, void **iterator);
 429
 430 /* Attributes Page mode */
 431
 432 /*
 433  * Read an attribute page and optionally set one attribute
 434  *
 435  * Retrieves the attribute page directly to a user buffer.
 436  * @attr_page_data shall stay valid until end of execution.
 437  * See osd_attributes.h for common page structures
 438  */
 439 int osd_req_add_get_attr_page(struct osd_request *or,
 440         u32 page_id, void *attr_page_data, unsigned max_page_len,
 441         const struct osd_attr *set_one);
 442
 443 #endif /* __OSD_LIB_H__ */