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 <--> firmware
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
snic_io_hdr_enc(struct snic_io_hdr * hdr,u8 typ,u8 status,u32 id,u32 hid,u16 sg_cnt,ulong ctx)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
snic_io_hdr_dec(struct snic_io_hdr * hdr,u8 * typ,u8 * stat,u32 * cmnd_id,u32 * hid,ulong * ctx)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)) - sizeof(ulong)))
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
452 ulong req_pa;
453 }; /* end of snic_host_req structure */
454
455
456 #define SNIC_FW_REQ_LEN 64 /* Expected length of fw req */
457 struct snic_fw_req {
458 struct snic_io_hdr hdr;
459 union {
460 /*
461 * Entry specific space, last byte contains color
462 */
463 u8 buf[SNIC_FW_REQ_LEN - sizeof(struct snic_io_hdr)];
464
465 /* Exchange Version Response */
466 struct snic_exch_ver_rsp exch_ver_cmpl;
467
468 /* Report Targets Response */
469 struct snic_report_tgts_cmpl rpt_tgts_cmpl;
470
471 /* scsi response */
472 struct snic_icmnd_cmpl icmnd_cmpl;
473
474 /* task management response */
475 struct snic_itmf_cmpl itmf_cmpl;
476
477 /* hba reset response */
478 struct snic_hba_reset_cmpl reset_cmpl;
479
480 /* notify message */
481 struct snic_notify_msg ack;
482
483 /* async notification event */
484 struct snic_async_evnotify async_ev;
485
486 } u;
487 }; /* end of snic_fw_req structure */
488
489 /*
490 * Auxillary macro to verify specific snic req/cmpl structures
491 * to ensure that it will be aligned to 64 bit, and not using
492 * color bit field
493 */
494 #define VERIFY_REQ_SZ(x)
495 #define VERIFY_CMPL_SZ(x)
496
497 /*
498 * Access routines to encode and decode the color bit, which is the most
499 * significant bit of the structure.
500 */
501 static inline void
snic_color_enc(struct snic_fw_req * req,u8 color)502 snic_color_enc(struct snic_fw_req *req, u8 color)
503 {
504 u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
505
506 if (color)
507 *c |= 0x80;
508 else
509 *c &= ~0x80;
510 }
511
512 static inline void
snic_color_dec(struct snic_fw_req * req,u8 * color)513 snic_color_dec(struct snic_fw_req *req, u8 *color)
514 {
515 u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
516
517 *color = *c >> 7;
518
519 /* Make sure color bit is read from desc *before* other fields
520 * are read from desc. Hardware guarantees color bit is last
521 * bit (byte) written. Adding the rmb() prevents the compiler
522 * and/or CPU from reordering the reads which would potentially
523 * result in reading stale values.
524 */
525 rmb();
526 }
527 #endif /* end of __SNIC_FWINT_H */
528