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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 | ||
d531b379 BH |
86 | static inline bool osd_dev_is_ver1(struct osd_dev *od) |
87 | { | |
88 | #ifdef OSD_VER1_SUPPORT | |
89 | return od->version == OSD_VER1; | |
90 | #else | |
91 | return false; | |
92 | #endif | |
93 | } | |
94 | ||
de258bf5 BH |
95 | struct osd_request; |
96 | typedef void (osd_req_done_fn)(struct osd_request *or, void *private); | |
97 | ||
98 | struct osd_request { | |
99 | struct osd_cdb cdb; | |
100 | struct osd_data_out_integrity_info out_data_integ; | |
101 | struct osd_data_in_integrity_info in_data_integ; | |
102 | ||
103 | struct osd_dev *osd_dev; | |
104 | struct request *request; | |
105 | ||
106 | struct _osd_req_data_segment { | |
107 | void *buff; | |
108 | unsigned alloc_size; /* 0 here means: don't call kfree */ | |
109 | unsigned total_bytes; | |
110 | } set_attr, enc_get_attr, get_attr; | |
111 | ||
112 | struct _osd_io_info { | |
113 | struct bio *bio; | |
114 | u64 total_bytes; | |
115 | struct request *req; | |
116 | struct _osd_req_data_segment *last_seg; | |
117 | u8 *pad_buff; | |
118 | } out, in; | |
119 | ||
120 | gfp_t alloc_flags; | |
121 | unsigned timeout; | |
122 | unsigned retries; | |
123 | u8 sense[OSD_MAX_SENSE_LEN]; | |
124 | enum osd_attributes_mode attributes_mode; | |
125 | ||
126 | osd_req_done_fn *async_done; | |
127 | void *async_private; | |
128 | int async_error; | |
129 | }; | |
130 | ||
c6572c98 BH |
131 | static inline bool osd_req_is_ver1(struct osd_request *or) |
132 | { | |
d531b379 | 133 | return osd_dev_is_ver1(or->osd_dev); |
c6572c98 BH |
134 | } |
135 | ||
de258bf5 BH |
136 | /* |
137 | * How to use the osd library: | |
138 | * | |
139 | * osd_start_request | |
140 | * Allocates a request. | |
141 | * | |
142 | * osd_req_* | |
143 | * Call one of, to encode the desired operation. | |
144 | * | |
145 | * osd_add_{get,set}_attr | |
146 | * Optionally add attributes to the CDB, list or page mode. | |
147 | * | |
148 | * osd_finalize_request | |
149 | * Computes final data out/in offsets and signs the request, | |
150 | * making it ready for execution. | |
151 | * | |
152 | * osd_execute_request | |
153 | * May be called to execute it through the block layer. Other wise submit | |
154 | * the associated block request in some other way. | |
155 | * | |
156 | * After execution: | |
157 | * osd_req_decode_sense | |
158 | * Decodes sense information to verify execution results. | |
159 | * | |
160 | * osd_req_decode_get_attr | |
161 | * Retrieve osd_add_get_attr_list() values if used. | |
162 | * | |
163 | * osd_end_request | |
164 | * Must be called to deallocate the request. | |
165 | */ | |
166 | ||
167 | /** | |
168 | * osd_start_request - Allocate and initialize an osd_request | |
169 | * | |
170 | * @osd_dev: OSD device that holds the scsi-device and default values | |
171 | * that the request is associated with. | |
172 | * @gfp: The allocation flags to use for request allocation, and all | |
173 | * subsequent allocations. This will be stored at | |
174 | * osd_request->alloc_flags, can be changed by user later | |
175 | * | |
176 | * Allocate osd_request and initialize all members to the | |
177 | * default/initial state. | |
178 | */ | |
179 | struct osd_request *osd_start_request(struct osd_dev *od, gfp_t gfp); | |
180 | ||
181 | enum osd_req_options { | |
182 | OSD_REQ_FUA = 0x08, /* Force Unit Access */ | |
183 | OSD_REQ_DPO = 0x10, /* Disable Page Out */ | |
184 | ||
185 | OSD_REQ_BYPASS_TIMESTAMPS = 0x80, | |
186 | }; | |
187 | ||
188 | /** | |
189 | * osd_finalize_request - Sign request and prepare request for execution | |
190 | * | |
191 | * @or: osd_request to prepare | |
192 | * @options: combination of osd_req_options bit flags or 0. | |
193 | * @cap: A Pointer to an OSD_CAP_LEN bytes buffer that is received from | |
194 | * The security manager as capabilities for this cdb. | |
195 | * @cap_key: The cryptographic key used to sign the cdb/data. Can be null | |
196 | * if NOSEC is used. | |
197 | * | |
198 | * The actual request and bios are only allocated here, so are the get_attr | |
199 | * buffers that will receive the returned attributes. Copy's @cap to cdb. | |
200 | * Sign the cdb/data with @cap_key. | |
201 | */ | |
202 | int osd_finalize_request(struct osd_request *or, | |
203 | u8 options, const void *cap, const u8 *cap_key); | |
204 | ||
205 | /** | |
206 | * osd_execute_request - Execute the request synchronously through block-layer | |
207 | * | |
208 | * @or: osd_request to Executed | |
209 | * | |
210 | * Calls blk_execute_rq to q the command and waits for completion. | |
211 | */ | |
212 | int osd_execute_request(struct osd_request *or); | |
213 | ||
214 | /** | |
215 | * osd_execute_request_async - Execute the request without waitting. | |
216 | * | |
217 | * @or: - osd_request to Executed | |
218 | * @done: (Optional) - Called at end of execution | |
219 | * @private: - Will be passed to @done function | |
220 | * | |
221 | * Calls blk_execute_rq_nowait to queue the command. When execution is done | |
222 | * optionally calls @done with @private as parameter. @or->async_error will | |
223 | * have the return code | |
224 | */ | |
225 | int osd_execute_request_async(struct osd_request *or, | |
226 | osd_req_done_fn *done, void *private); | |
227 | ||
98f3aea2 BH |
228 | /** |
229 | * osd_req_decode_sense_full - Decode sense information after execution. | |
230 | * | |
231 | * @or: - osd_request to examine | |
232 | * @osi - Recievs a more detailed error report information (optional). | |
233 | * @silent - Do not print to dmsg (Even if enabled) | |
234 | * @bad_obj_list - Some commands act on multiple objects. Failed objects will | |
235 | * be recieved here (optional) | |
236 | * @max_obj - Size of @bad_obj_list. | |
237 | * @bad_attr_list - List of failing attributes (optional) | |
238 | * @max_attr - Size of @bad_attr_list. | |
239 | * | |
240 | * After execution, sense + return code can be analyzed using this function. The | |
241 | * return code is the final disposition on the error. So it is possible that a | |
242 | * CHECK_CONDITION was returned from target but this will return NO_ERROR, for | |
243 | * example on recovered errors. All parameters are optional if caller does | |
244 | * not need any returned information. | |
245 | * Note: This function will also dump the error to dmsg according to settings | |
246 | * of the SCSI_OSD_DPRINT_SENSE Kconfig value. Set @silent if you know the | |
247 | * command would routinely fail, to not spam the dmsg file. | |
248 | */ | |
249 | struct osd_sense_info { | |
250 | int key; /* one of enum scsi_sense_keys */ | |
251 | int additional_code ; /* enum osd_additional_sense_codes */ | |
252 | union { /* Sense specific information */ | |
253 | u16 sense_info; | |
254 | u16 cdb_field_offset; /* scsi_invalid_field_in_cdb */ | |
255 | }; | |
256 | union { /* Command specific information */ | |
257 | u64 command_info; | |
258 | }; | |
259 | ||
260 | u32 not_initiated_command_functions; /* osd_command_functions_bits */ | |
261 | u32 completed_command_functions; /* osd_command_functions_bits */ | |
262 | struct osd_obj_id obj; | |
263 | struct osd_attr attr; | |
264 | }; | |
265 | ||
266 | int osd_req_decode_sense_full(struct osd_request *or, | |
267 | struct osd_sense_info *osi, bool silent, | |
268 | struct osd_obj_id *bad_obj_list, int max_obj, | |
269 | struct osd_attr *bad_attr_list, int max_attr); | |
270 | ||
271 | static inline int osd_req_decode_sense(struct osd_request *or, | |
272 | struct osd_sense_info *osi) | |
273 | { | |
274 | return osd_req_decode_sense_full(or, osi, false, NULL, 0, NULL, 0); | |
275 | } | |
276 | ||
de258bf5 BH |
277 | /** |
278 | * osd_end_request - return osd_request to free store | |
279 | * | |
280 | * @or: osd_request to free | |
281 | * | |
282 | * Deallocate all osd_request resources (struct req's, BIOs, buffers, etc.) | |
283 | */ | |
284 | void osd_end_request(struct osd_request *or); | |
285 | ||
286 | /* | |
287 | * CDB Encoding | |
288 | * | |
289 | * Note: call only one of the following methods. | |
290 | */ | |
291 | ||
292 | /* | |
293 | * Device commands | |
294 | */ | |
295 | void osd_req_set_master_seed_xchg(struct osd_request *or, ...);/* NI */ | |
296 | void osd_req_set_master_key(struct osd_request *or, ...);/* NI */ | |
297 | ||
298 | void osd_req_format(struct osd_request *or, u64 tot_capacity); | |
299 | ||
300 | /* list all partitions | |
301 | * @list header must be initialized to zero on first run. | |
302 | * | |
303 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
304 | */ | |
305 | int osd_req_list_dev_partitions(struct osd_request *or, | |
306 | osd_id initial_id, struct osd_obj_id_list *list, unsigned nelem); | |
307 | ||
308 | void osd_req_flush_obsd(struct osd_request *or, | |
309 | enum osd_options_flush_scope_values); | |
310 | ||
311 | void osd_req_perform_scsi_command(struct osd_request *or, | |
312 | const u8 *cdb, ...);/* NI */ | |
313 | void osd_req_task_management(struct osd_request *or, ...);/* NI */ | |
314 | ||
315 | /* | |
316 | * Partition commands | |
317 | */ | |
318 | void osd_req_create_partition(struct osd_request *or, osd_id partition); | |
319 | void osd_req_remove_partition(struct osd_request *or, osd_id partition); | |
320 | ||
321 | void osd_req_set_partition_key(struct osd_request *or, | |
322 | osd_id partition, u8 new_key_id[OSD_CRYPTO_KEYID_SIZE], | |
323 | u8 seed[OSD_CRYPTO_SEED_SIZE]);/* NI */ | |
324 | ||
325 | /* list all collections in the partition | |
326 | * @list header must be init to zero on first run. | |
327 | * | |
328 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
329 | */ | |
330 | int osd_req_list_partition_collections(struct osd_request *or, | |
331 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
332 | unsigned nelem); | |
333 | ||
334 | /* list all objects in the partition | |
335 | * @list header must be init to zero on first run. | |
336 | * | |
337 | * Call osd_is_obj_list_done() to find if we got the complete list. | |
338 | */ | |
339 | int osd_req_list_partition_objects(struct osd_request *or, | |
340 | osd_id partition, osd_id initial_id, struct osd_obj_id_list *list, | |
341 | unsigned nelem); | |
342 | ||
343 | void osd_req_flush_partition(struct osd_request *or, | |
344 | osd_id partition, enum osd_options_flush_scope_values); | |
345 | ||
346 | /* | |
347 | * Collection commands | |
348 | */ | |
349 | void osd_req_create_collection(struct osd_request *or, | |
350 | const struct osd_obj_id *);/* NI */ | |
351 | void osd_req_remove_collection(struct osd_request *or, | |
352 | const struct osd_obj_id *);/* NI */ | |
353 | ||
354 | /* list all objects in the collection */ | |
355 | int osd_req_list_collection_objects(struct osd_request *or, | |
356 | const struct osd_obj_id *, osd_id initial_id, | |
357 | struct osd_obj_id_list *list, unsigned nelem); | |
358 | ||
359 | /* V2 only filtered list of objects in the collection */ | |
360 | void osd_req_query(struct osd_request *or, ...);/* NI */ | |
361 | ||
362 | void osd_req_flush_collection(struct osd_request *or, | |
363 | const struct osd_obj_id *, enum osd_options_flush_scope_values); | |
364 | ||
365 | void osd_req_get_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
366 | void osd_req_set_member_attrs(struct osd_request *or, ...);/* V2-only NI */ | |
367 | ||
368 | /* | |
369 | * Object commands | |
370 | */ | |
371 | void osd_req_create_object(struct osd_request *or, struct osd_obj_id *); | |
372 | void osd_req_remove_object(struct osd_request *or, struct osd_obj_id *); | |
373 | ||
374 | void osd_req_write(struct osd_request *or, | |
62f469b5 | 375 | const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len); |
0e35afbc BH |
376 | int osd_req_write_kern(struct osd_request *or, |
377 | const struct osd_obj_id *obj, u64 offset, void *buff, u64 len); | |
de258bf5 BH |
378 | void osd_req_append(struct osd_request *or, |
379 | const struct osd_obj_id *, struct bio *data_out);/* NI */ | |
380 | void osd_req_create_write(struct osd_request *or, | |
381 | const struct osd_obj_id *, struct bio *data_out, u64 offset);/* NI */ | |
382 | void osd_req_clear(struct osd_request *or, | |
383 | const struct osd_obj_id *, u64 offset, u64 len);/* NI */ | |
384 | void osd_req_punch(struct osd_request *or, | |
385 | const struct osd_obj_id *, u64 offset, u64 len);/* V2-only NI */ | |
386 | ||
387 | void osd_req_flush_object(struct osd_request *or, | |
388 | const struct osd_obj_id *, enum osd_options_flush_scope_values, | |
389 | /*V2*/ u64 offset, /*V2*/ u64 len); | |
390 | ||
391 | void osd_req_read(struct osd_request *or, | |
62f469b5 | 392 | const struct osd_obj_id *obj, u64 offset, struct bio *bio, u64 len); |
0e35afbc BH |
393 | int osd_req_read_kern(struct osd_request *or, |
394 | const struct osd_obj_id *obj, u64 offset, void *buff, u64 len); | |
de258bf5 BH |
395 | |
396 | /* | |
397 | * Root/Partition/Collection/Object Attributes commands | |
398 | */ | |
399 | ||
400 | /* get before set */ | |
401 | void osd_req_get_attributes(struct osd_request *or, const struct osd_obj_id *); | |
402 | ||
403 | /* set before get */ | |
404 | void osd_req_set_attributes(struct osd_request *or, const struct osd_obj_id *); | |
405 | ||
406 | /* | |
407 | * Attributes appended to most commands | |
408 | */ | |
409 | ||
410 | /* Attributes List mode (or V2 CDB) */ | |
411 | /* | |
412 | * TODO: In ver2 if at finalize time only one attr was set and no gets, | |
413 | * then the Attributes CDB mode is used automatically to save IO. | |
414 | */ | |
415 | ||
416 | /* set a list of attributes. */ | |
417 | int osd_req_add_set_attr_list(struct osd_request *or, | |
418 | const struct osd_attr *, unsigned nelem); | |
419 | ||
420 | /* get a list of attributes */ | |
421 | int osd_req_add_get_attr_list(struct osd_request *or, | |
422 | const struct osd_attr *, unsigned nelem); | |
423 | ||
424 | /* | |
425 | * Attributes list decoding | |
426 | * Must be called after osd_request.request was executed | |
427 | * It is called in a loop to decode the returned get_attr | |
428 | * (see osd_add_get_attr) | |
429 | */ | |
430 | int osd_req_decode_get_attr_list(struct osd_request *or, | |
431 | struct osd_attr *, int *nelem, void **iterator); | |
432 | ||
433 | /* Attributes Page mode */ | |
434 | ||
435 | /* | |
436 | * Read an attribute page and optionally set one attribute | |
437 | * | |
438 | * Retrieves the attribute page directly to a user buffer. | |
439 | * @attr_page_data shall stay valid until end of execution. | |
440 | * See osd_attributes.h for common page structures | |
441 | */ | |
442 | int osd_req_add_get_attr_page(struct osd_request *or, | |
443 | u32 page_id, void *attr_page_data, unsigned max_page_len, | |
444 | const struct osd_attr *set_one); | |
445 | ||
446 | #endif /* __OSD_LIB_H__ */ |