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de258bf5 BH |
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> | |
fc2fac5b | 21 | #include <scsi/scsi_device.h> |
de258bf5 BH |
22 | |
23 | /* Note: "NI" in comments below means "Not Implemented yet" */ | |
24 | ||
c6572c98 BH |
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 | ||
de258bf5 BH |
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 | unsigned def_timeout; | |
c6572c98 BH |
52 | |
53 | #ifdef OSD_VER1_SUPPORT | |
54 | enum osd_std_version version; | |
55 | #endif | |
de258bf5 BH |
56 | }; |
57 | ||
b799bc7d BH |
58 | /* Retrieve/return osd_dev(s) for use by Kernel clients */ |
59 | struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/ | |
60 | void osduld_put_device(struct osd_dev *od); | |
61 | ||
95b05a7d BH |
62 | /* Add/remove test ioctls from external modules */ |
63 | typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg); | |
64 | int osduld_register_test(unsigned ioctl, do_test_fn *do_test); | |
65 | void osduld_unregister_test(unsigned ioctl); | |
66 | ||
67 | /* These are called by uld at probe time */ | |
de258bf5 BH |
68 | void osd_dev_init(struct osd_dev *od, struct scsi_device *scsi_device); |
69 | void osd_dev_fini(struct osd_dev *od); | |
70 | ||
1b9dce94 BH |
71 | /* some hi level device operations */ |
72 | int osd_auto_detect_ver(struct osd_dev *od, void *caps); /* GFP_KERNEL */ | |
fc2fac5b BH |
73 | static inline struct request_queue *osd_request_queue(struct osd_dev *od) |
74 | { | |
75 | return od->scsi_device->request_queue; | |
76 | } | |
1b9dce94 | 77 | |
c6572c98 BH |
78 | /* we might want to use function vector in the future */ |
79 | static inline void osd_dev_set_ver(struct osd_dev *od, enum osd_std_version v) | |
80 | { | |
81 | #ifdef OSD_VER1_SUPPORT | |
82 | od->version = v; | |
83 | #endif | |
84 | } | |
85 | ||
de258bf5 BH |
86 | struct osd_request; |
87 | typedef void (osd_req_done_fn)(struct osd_request *or, void *private); | |
88 | ||
89 | struct osd_request { | |
90 | struct osd_cdb cdb; | |
91 | struct osd_data_out_integrity_info out_data_integ; | |
92 | struct osd_data_in_integrity_info in_data_integ; | |
93 | ||
94 | struct osd_dev *osd_dev; | |
95 | struct request *request; | |
96 | ||
97 | struct _osd_req_data_segment { | |
98 | void *buff; | |
99 | unsigned alloc_size; /* 0 here means: don't call kfree */ | |
100 | unsigned total_bytes; | |
101 | } set_attr, enc_get_attr, get_attr; | |
102 | ||
103 | struct _osd_io_info { | |
104 | struct bio *bio; | |
105 | u64 total_bytes; | |
106 | struct request *req; | |
107 | struct _osd_req_data_segment *last_seg; | |
108 | u8 *pad_buff; | |
109 | } out, in; | |
110 | ||
111 | gfp_t alloc_flags; | |
112 | unsigned timeout; | |
113 | unsigned retries; | |
114 | u8 sense[OSD_MAX_SENSE_LEN]; | |
115 | enum osd_attributes_mode attributes_mode; | |
116 | ||
117 | osd_req_done_fn *async_done; | |
118 | void *async_private; | |
119 | int async_error; | |
120 | }; | |
121 | ||
c6572c98 BH |
122 | /* OSD Version control */ |
123 | static inline bool osd_req_is_ver1(struct osd_request *or) | |
124 | { | |
125 | #ifdef OSD_VER1_SUPPORT | |
126 | return or->osd_dev->version == OSD_VER1; | |
127 | #else | |
128 | return false; | |
129 | #endif | |
130 | } | |
131 | ||
de258bf5 BH |
132 | /* |
133 | * How to use the osd library: | |
134 | * | |
135 | * osd_start_request | |
136 | * Allocates a request. | |
137 | * | |
138 | * osd_req_* | |
139 | * Call one of, to encode the desired operation. | |
140 | * | |
141 | * osd_add_{get,set}_attr | |
142 | * Optionally add attributes to the CDB, list or page mode. | |
143 | * | |
144 | * osd_finalize_request | |
145 | * Computes final data out/in offsets and signs the request, | |
146 | * making it ready for execution. | |
147 | * | |
148 | * osd_execute_request | |
149 | * May be called to execute it through the block layer. Other wise submit | |
150 | * the associated block request in some other way. | |
151 | * | |
152 | * After execution: | |
153 | * osd_req_decode_sense | |
154 | * Decodes sense information to verify execution results. | |
155 | * | |
156 | * osd_req_decode_get_attr | |
157 | * Retrieve osd_add_get_attr_list() values if used. | |
158 | * | |
159 | * osd_end_request | |
160 | * Must be called to deallocate the request. | |
161 | */ | |
162 | ||
163 | /** | |
164 | * osd_start_request - Allocate and initialize an osd_request | |
165 | * | |
166 | * @osd_dev: OSD device that holds the scsi-device and default values | |
167 | * that the request is associated with. | |
168 | * @gfp: The allocation flags to use for request allocation, and all | |
169 | * subsequent allocations. This will be stored at | |
170 | * osd_request->alloc_flags, can be changed by user later | |
171 | * | |
172 | * Allocate osd_request and initialize all members to the | |
173 | * default/initial state. | |
174 | */ | |
175 | struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp); | |
176 | ||
177 | enum osd_req_options { | |
178 | OSD_REQ_FUA = 0x08, /* Force Unit Access */ | |
179 | OSD_REQ_DPO = 0x10, /* Disable Page Out */ | |
180 | ||
181 | OSD_REQ_BYPASS_TIMESTAMPS = 0x80, | |
182 | }; | |
183 | ||
184 | /** | |
185 | * osd_finalize_request - Sign request and prepare request for execution | |
186 | * | |
187 | * @or: osd_request to prepare | |
188 | * @options: combination of osd_req_options bit flags or 0. | |
189 | * @cap: A Pointer to an OSD_CAP_LEN bytes buffer that is received from | |
190 | * The security manager as capabilities for this cdb. | |
191 | * @cap_key: The cryptographic key used to sign the cdb/data. Can be null | |
192 | * if NOSEC is used. | |
193 | * | |
194 | * The actual request and bios are only allocated here, so are the get_attr | |
195 | * buffers that will receive the returned attributes. Copy's @cap to cdb. | |
196 | * Sign the cdb/data with @cap_key. | |
197 | */ | |
198 | int osd_finalize_request(struct osd_request *or, | |
199 | u8 options, const void *cap, const u8 *cap_key); | |
200 | ||
201 | /** | |
202 | * osd_execute_request - Execute the request synchronously through block-layer | |
203 | * | |
204 | * @or: osd_request to Executed | |
205 | * | |
206 | * Calls blk_execute_rq to q the command and waits for completion. | |
207 | */ | |
208 | int osd_execute_request(struct osd_request *or); | |
209 | ||
210 | /** | |
211 | * osd_execute_request_async - Execute the request without waitting. | |
212 | * | |
213 | * @or: - osd_request to Executed | |
214 | * @done: (Optional) - Called at end of execution | |
215 | * @private: - Will be passed to @done function | |
216 | * | |
217 | * Calls blk_execute_rq_nowait to queue the command. When execution is done | |
218 | * optionally calls @done with @private as parameter. @or->async_error will | |
219 | * have the return code | |
220 | */ | |
221 | int osd_execute_request_async(struct osd_request *or, | |
222 | osd_req_done_fn *done, void *private); | |
223 | ||
98f3aea2 BH |
224 | /** |
225 | * osd_req_decode_sense_full - Decode sense information after execution. | |
226 | * | |
227 | * @or: - osd_request to examine | |
228 | * @osi - Recievs a more detailed error report information (optional). | |
229 | * @silent - Do not print to dmsg (Even if enabled) | |
230 | * @bad_obj_list - Some commands act on multiple objects. Failed objects will | |
231 | * be recieved here (optional) | |
232 | * @max_obj - Size of @bad_obj_list. | |
233 | * @bad_attr_list - List of failing attributes (optional) | |
234 | * @max_attr - Size of @bad_attr_list. | |
235 | * | |
236 | * After execution, sense + return code can be analyzed using this function. The | |
237 | * return code is the final disposition on the error. So it is possible that a | |
238 | * CHECK_CONDITION was returned from target but this will return NO_ERROR, for | |
239 | * example on recovered errors. All parameters are optional if caller does | |
240 | * not need any returned information. | |
241 | * Note: This function will also dump the error to dmsg according to settings | |
242 | * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the | |
243 | * command would routinely fail, to not spam the dmsg file. | |
244 | */ | |
245 | struct osd_sense_info { | |
246 | int key; /* one of enum scsi_sense_keys */ | |
247 | int additional_code ; /* enum osd_additional_sense_codes */ | |
248 | union { /* Sense specific information */ | |
249 | u16 sense_info; | |
250 | u16 cdb_field_offset; /* scsi_invalid_field_in_cdb */ | |
251 | }; | |
252 | union { /* Command specific information */ | |
253 | u64 command_info; | |
254 | }; | |
255 | ||
256 | u32 not_initiated_command_functions; /* osd_command_functions_bits */ | |
257 | u32 completed_command_functions; /* osd_command_functions_bits */ | |
258 | struct osd_obj_id obj; | |
259 | struct osd_attr attr; | |
260 | }; | |
261 | ||
262 | int osd_req_decode_sense_full(struct osd_request *or, | |
263 | struct osd_sense_info *osi, bool silent, | |
264 | struct osd_obj_id *bad_obj_list, int max_obj, | |
265 | struct osd_attr *bad_attr_list, int max_attr); | |
266 | ||
267 | static inline int osd_req_decode_sense(struct osd_request *or, | |
268 | struct osd_sense_info *osi) | |
269 | { | |
270 | return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0); | |
271 | } | |
272 | ||
de258bf5 BH |
273 | /** |
274 | * osd_end_request - return osd_request to free store | |
275 | * | |
276 | * @or: osd_request to free | |
277 | * | |
278 | * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.) | |
279 | */ | |
280 | void osd_end_request(struct osd_request *or); | |
281 | ||
282 | /* | |
283 | * CDB Encoding | |
284 | * | |
285 | * Note: call only one of the following methods. | |
286 | */ | |
287 | ||
288 | /* | |
289 | * Device commands | |
290 | */ | |
291 | void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */ | |
292 | void osd_req_set_master_key(struct osd_request *or, ...);/* NI */ | |
293 | ||
294 | void osd_req_format(struct osd_request *or, u64 tot_capacity); | |
295 | ||
296 | /* list all partitions | |
297 | * @list header must be initialized to zero on first run. | |
298 | * | |
299 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
300 | */ | |
301 | int osd_req_list_dev_partitions(struct osd_request *or, | |
302 | osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem); | |
303 | ||
304 | void osd_req_flush_obsd(struct osd_request *or, | |
305 | enum osd_options_flush_scope_values); | |
306 | ||
307 | void osd_req_perform_scsi_command(struct osd_request *or, | |
308 | const u8 *cdb, ...);/* NI */ | |
309 | void osd_req_task_management(struct osd_request *or, ...);/* NI */ | |
310 | ||
311 | /* | |
312 | * Partition commands | |
313 | */ | |
314 | void osd_req_create_partition(struct osd_request *or, osd_id partition); | |
315 | void osd_req_remove_partition(struct osd_request *or, osd_id partition); | |
316 | ||
317 | void osd_req_set_partition_key(struct osd_request *or, | |
318 | osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE], | |
319 | u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */ | |
320 | ||
321 | /* list all collections in the partition | |
322 | * @list header must be init to zero on first run. | |
323 | * | |
324 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
325 | */ | |
326 | int osd_req_list_partition_collections(struct osd_request *or, | |
327 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
328 | unsigned nelem); | |
329 | ||
330 | /* list all objects in the partition | |
331 | * @list header must be init to zero on first run. | |
332 | * | |
333 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
334 | */ | |
335 | int osd_req_list_partition_objects(struct osd_request *or, | |
336 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
337 | unsigned nelem); | |
338 | ||
339 | void osd_req_flush_partition(struct osd_request *or, | |
340 | osd_id partition, enum osd_options_flush_scope_values); | |
341 | ||
342 | /* | |
343 | * Collection commands | |
344 | */ | |
345 | void osd_req_create_collection(struct osd_request *or, | |
346 | const struct osd_obj_id *);/* NI */ | |
347 | void osd_req_remove_collection(struct osd_request *or, | |
348 | const struct osd_obj_id *);/* NI */ | |
349 | ||
350 | /* list all objects in the collection */ | |
351 | int osd_req_list_collection_objects(struct osd_request *or, | |
352 | const struct osd_obj_id *, osd_id initial_id, | |
353 | struct osd_obj_id_list *list, unsigned nelem); | |
354 | ||
355 | /* V2 only filtered list of objects in the collection */ | |
356 | void osd_req_query(struct osd_request *or, ...);/* NI */ | |
357 | ||
358 | void osd_req_flush_collection(struct osd_request *or, | |
359 | const struct osd_obj_id *, enum osd_options_flush_scope_values); | |
360 | ||
361 | void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
362 | void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
363 | ||
364 | /* | |
365 | * Object commands | |
366 | */ | |
367 | void osd_req_create_object(struct osd_request *or, struct osd_obj_id *); | |
368 | void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *); | |
369 | ||
370 | void osd_req_write(struct osd_request *or, | |
62f469b5 | 371 | const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len); |
0e35afbc BH |
372 | int osd_req_write_kern(struct osd_request *or, |
373 | const struct osd_obj_id *obj, u64 offset, void *buff, u64 len); | |
de258bf5 BH |
374 | void osd_req_append(struct osd_request *or, |
375 | const struct osd_obj_id *, struct bio *data_out);/* NI */ | |
376 | void osd_req_create_write(struct osd_request *or, | |
377 | const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */ | |
378 | void osd_req_clear(struct osd_request *or, | |
379 | const struct osd_obj_id *, u64 offset, u64 len);/* NI */ | |
380 | void osd_req_punch(struct osd_request *or, | |
381 | const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */ | |
382 | ||
383 | void osd_req_flush_object(struct osd_request *or, | |
384 | const struct osd_obj_id *, enum osd_options_flush_scope_values, | |
385 | /*V2*/ u64 offset, /*V2*/ u64 len); | |
386 | ||
387 | void osd_req_read(struct osd_request *or, | |
62f469b5 | 388 | const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len); |
0e35afbc BH |
389 | int osd_req_read_kern(struct osd_request *or, |
390 | const struct osd_obj_id *obj, u64 offset, void *buff, u64 len); | |
de258bf5 BH |
391 | |
392 | /* | |
393 | * Root/Partition/Collection/Object Attributes commands | |
394 | */ | |
395 | ||
396 | /* get before set */ | |
397 | void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *); | |
398 | ||
399 | /* set before get */ | |
400 | void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *); | |
401 | ||
402 | /* | |
403 | * Attributes appended to most commands | |
404 | */ | |
405 | ||
406 | /* Attributes List mode (or V2 CDB) */ | |
407 | /* | |
408 | * TODO: In ver2 if at finalize time only one attr was set and no gets, | |
409 | * then the Attributes CDB mode is used automatically to save IO. | |
410 | */ | |
411 | ||
412 | /* set a list of attributes. */ | |
413 | int osd_req_add_set_attr_list(struct osd_request *or, | |
414 | const struct osd_attr *, unsigned nelem); | |
415 | ||
416 | /* get a list of attributes */ | |
417 | int osd_req_add_get_attr_list(struct osd_request *or, | |
418 | const struct osd_attr *, unsigned nelem); | |
419 | ||
420 | /* | |
421 | * Attributes list decoding | |
422 | * Must be called after osd_request.request was executed | |
423 | * It is called in a loop to decode the returned get_attr | |
424 | * (see osd_add_get_attr) | |
425 | */ | |
426 | int osd_req_decode_get_attr_list(struct osd_request *or, | |
427 | struct osd_attr *, int *nelem, void **iterator); | |
428 | ||
429 | /* Attributes Page mode */ | |
430 | ||
431 | /* | |
432 | * Read an attribute page and optionally set one attribute | |
433 | * | |
434 | * Retrieves the attribute page directly to a user buffer. | |
435 | * @attr_page_data shall stay valid until end of execution. | |
436 | * See osd_attributes.h for common page structures | |
437 | */ | |
438 | int osd_req_add_get_attr_page(struct osd_request *or, | |
439 | u32 page_id, void *attr_page_data, unsigned max_page_len, | |
440 | const struct osd_attr *set_one); | |
441 | ||
442 | #endif /* __OSD_LIB_H__ */ |