1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
3 
4 #ifndef __SNIC_FWINT_H
5 #define __SNIC_FWINT_H
6 
7 #define SNIC_CDB_LEN	32	/* SCSI CDB size 32, can be used for 16 bytes */
8 #define LUN_ADDR_LEN	8
9 
10 /*
11  * Command entry type
12  */
13 enum snic_io_type {
14 	/*
15 	 * Initiator request types
16 	 */
17 	SNIC_REQ_REPORT_TGTS = 0x2,	/* Report Targets */
18 	SNIC_REQ_ICMND,			/* Initiator command for SCSI IO */
19 	SNIC_REQ_ITMF,			/* Initiator command for Task Mgmt */
20 	SNIC_REQ_HBA_RESET,		/* SNIC Reset */
21 	SNIC_REQ_EXCH_VER,		/* Exchange Version Information */
22 	SNIC_REQ_TGT_INFO,		/* Backend/Target Information */
23 	SNIC_REQ_BOOT_LUNS,
24 
25 	/*
26 	 * Response type
27 	 */
28 	SNIC_RSP_REPORT_TGTS_CMPL = 0x12,/* Report Targets Completion */
29 	SNIC_RSP_ICMND_CMPL,		/* SCSI IO Completion */
30 	SNIC_RSP_ITMF_CMPL,		/* Task Management Completion */
31 	SNIC_RSP_HBA_RESET_CMPL,	/* SNIC Reset Completion */
32 	SNIC_RSP_EXCH_VER_CMPL,		/* Exchange Version Completion*/
33 	SNIC_RSP_BOOT_LUNS_CMPL,
34 
35 	/*
36 	 * Misc Request types
37 	 */
38 	SNIC_MSG_ACK = 0x80,		/* Ack: snic_notify_msg */
39 	SNIC_MSG_ASYNC_EVNOTIFY,	/* Asynchronous Event Notification */
40 }; /* end of enum snic_io_type */
41 
42 
43 /*
44  * Header status codes from firmware
45  */
46 enum snic_io_status {
47 	SNIC_STAT_IO_SUCCESS = 0,	/* request was successful */
48 
49 	/*
50 	 * If a request to the fw is rejected, the original request header
51 	 * will be returned with the status set to one of the following:
52 	 */
53 	SNIC_STAT_INVALID_HDR,	/* header contains invalid data */
54 	SNIC_STAT_OUT_OF_RES,	/* out of resources to complete request */
55 	SNIC_STAT_INVALID_PARM,	/* some parameter in request is not valid */
56 	SNIC_STAT_REQ_NOT_SUP,	/* req type is not supported */
57 	SNIC_STAT_IO_NOT_FOUND,	/* requested IO was not found */
58 
59 	/*
60 	 * Once a request is processed, the fw will usually return
61 	 * a cmpl message type. In cases where errors occurred,
62 	 * the header status would be filled in with one of the following:
63 	 */
64 	SNIC_STAT_ABORTED,		/* req was aborted */
65 	SNIC_STAT_TIMEOUT,		/* req was timed out */
66 	SNIC_STAT_SGL_INVALID,		/* req was aborted due to sgl error */
67 	SNIC_STAT_DATA_CNT_MISMATCH,	/*recv/sent more/less data than expec */
68 	SNIC_STAT_FW_ERR,		/* req was terminated due to fw error */
69 	SNIC_STAT_ITMF_REJECT,		/* itmf req was rejected by target */
70 	SNIC_STAT_ITMF_FAIL,		/* itmf req was failed */
71 	SNIC_STAT_ITMF_INCORRECT_LUN,	/* itmf req has incorrect LUN id*/
72 	SNIC_STAT_CMND_REJECT,		/* req was invalid and rejected */
73 	SNIC_STAT_DEV_OFFLINE,		/* req sent to offline device */
74 	SNIC_STAT_NO_BOOTLUN,
75 	SNIC_STAT_SCSI_ERR,		/* SCSI error returned by Target. */
76 	SNIC_STAT_NOT_READY,		/* sNIC Subsystem is not ready */
77 	SNIC_STAT_FATAL_ERROR,		/* sNIC is in unrecoverable state */
78 }; /* end of enum snic_io_status */
79 
80 /*
81  * snic_io_hdr : host <--> firmware
82  *
83  * for any other message that will be queued to firmware should
84  *  have the following request header
85  */
86 struct snic_io_hdr {
87 	__le32	hid;
88 	__le32	cmnd_id;	/* tag here */
89 	ulong	init_ctx;	/* initiator context */
90 	u8	type;		/* request/response type */
91 	u8	status;		/* header status entry */
92 	u8	protocol;	/* Protocol specific, may needed for RoCE*/
93 	u8	flags;
94 	__le16	sg_cnt;
95 	u16	resvd;
96 };
97 
98 /* auxillary funciton for encoding the snic_io_hdr */
99 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)100 snic_io_hdr_enc(struct snic_io_hdr *hdr, u8 typ, u8 status, u32 id, u32 hid,
101 		u16 sg_cnt, ulong ctx)
102 {
103 	hdr->type = typ;
104 	hdr->status = status;
105 	hdr->protocol = 0;
106 	hdr->hid = cpu_to_le32(hid);
107 	hdr->cmnd_id = cpu_to_le32(id);
108 	hdr->sg_cnt = cpu_to_le16(sg_cnt);
109 	hdr->init_ctx = ctx;
110 	hdr->flags = 0;
111 }
112 
113 /* auxillary funciton for decoding the snic_io_hdr */
114 static inline void
snic_io_hdr_dec(struct snic_io_hdr * hdr,u8 * typ,u8 * stat,u32 * cmnd_id,u32 * hid,ulong * ctx)115 snic_io_hdr_dec(struct snic_io_hdr *hdr, u8 *typ, u8 *stat, u32 *cmnd_id,
116 		u32 *hid, ulong *ctx)
117 {
118 	*typ = hdr->type;
119 	*stat = hdr->status;
120 	*hid = le32_to_cpu(hdr->hid);
121 	*cmnd_id = le32_to_cpu(hdr->cmnd_id);
122 	*ctx = hdr->init_ctx;
123 }
124 
125 /*
126  * snic_host_info: host -> firmware
127  *
128  * Used for sending host information to firmware, and request fw version
129  */
130 struct snic_exch_ver_req {
131 	__le32	drvr_ver;	/* for debugging, when fw dump captured */
132 	__le32	os_type;	/* for OS specific features */
133 };
134 
135 /*
136  * os_type flags
137  * Bit 0-7 : OS information
138  * Bit 8-31: Feature/Capability Information
139  */
140 #define SNIC_OS_LINUX	0x1
141 #define SNIC_OS_WIN	0x2
142 #define SNIC_OS_ESX	0x3
143 
144 /*
145  * HBA Capabilities
146  * Bit 1: Reserved.
147  * Bit 2: Dynamic Discovery of LUNs.
148  * Bit 3: Async event notifications on tgt online/offline events.
149  * Bit 4: IO timeout support in FW.
150  * Bit 5-31: Reserved.
151  */
152 #define SNIC_HBA_CAP_DDL	0x02	/* Supports Dynamic Discovery of LUNs */
153 #define SNIC_HBA_CAP_AEN	0x04	/* Supports Async Event Noitifcation */
154 #define SNIC_HBA_CAP_TMO	0x08	/* Supports IO timeout in FW */
155 
156 /*
157  * snic_exch_ver_rsp : firmware -> host
158  *
159  * Used by firmware to send response to version request
160  */
161 struct snic_exch_ver_rsp {
162 	__le32	version;
163 	__le32	hid;
164 	__le32	max_concur_ios;		/* max concurrent ios */
165 	__le32	max_sgs_per_cmd;	/* max sgls per IO */
166 	__le32	max_io_sz;		/* max io size supported */
167 	__le32	hba_cap;		/* hba capabilities */
168 	__le32	max_tgts;		/* max tgts supported */
169 	__le16	io_timeout;		/* FW extended timeout */
170 	u16	rsvd;
171 };
172 
173 
174 /*
175  * snic_report_tgts : host -> firmware request
176  *
177  * Used by the host to request list of targets
178  */
179 struct snic_report_tgts {
180 	__le16	sg_cnt;
181 	__le16	flags;		/* specific flags from fw */
182 	u8	_resvd[4];
183 	__le64	sg_addr;	/* Points to SGL */
184 	__le64	sense_addr;
185 };
186 
187 enum snic_type {
188 	SNIC_NONE = 0x0,
189 	SNIC_DAS,
190 	SNIC_SAN,
191 };
192 
193 
194 /* Report Target Response */
195 enum snic_tgt_type {
196 	SNIC_TGT_NONE = 0x0,
197 	SNIC_TGT_DAS,	/* DAS Target */
198 	SNIC_TGT_SAN,	/* SAN Target */
199 };
200 
201 /* target id format */
202 struct snic_tgt_id {
203 	__le32	tgt_id;		/* target id */
204 	__le16	tgt_type;	/* tgt type */
205 	__le16	vnic_id;	/* corresponding vnic id */
206 };
207 
208 /*
209  * snic_report_tgts_cmpl : firmware -> host response
210  *
211  * Used by firmware to send response to Report Targets request
212  */
213 struct snic_report_tgts_cmpl {
214 	__le32	tgt_cnt;	/* Number of Targets accessible */
215 	u32	_resvd;
216 };
217 
218 /*
219  * Command flags
220  *
221  * Bit 0: Read flags
222  * Bit 1: Write flag
223  * Bit 2: ESGL - sg/esg array contains extended sg
224  *	  ESGE - is a host buffer contains sg elements
225  * Bit 3-4: Task Attributes
226  *		00b - simple
227  *		01b - head of queue
228  *		10b - ordered
229  * Bit 5-7: Priority - future use
230  * Bit 8-15: Reserved
231  */
232 
233 #define SNIC_ICMND_WR		0x01	/* write command */
234 #define SNIC_ICMND_RD		0x02	/* read command */
235 #define SNIC_ICMND_ESGL		0x04	/* SGE/ESGE array contains valid data*/
236 
237 /*
238  * Priority/Task Attribute settings
239  */
240 #define SNIC_ICMND_TSK_SHIFT		2	/* task attr starts at bit 2 */
241 #define SNIC_ICMND_TSK_MASK(x)		((x>>SNIC_ICMND_TSK_SHIFT) & ~(0xffff))
242 #define SNIC_ICMND_TSK_SIMPLE		0	/* simple task attr */
243 #define SNIC_ICMND_TSK_HEAD_OF_QUEUE	1	/* head of qeuue task attr */
244 #define SNIC_ICMND_TSK_ORDERED		2	/* ordered task attr */
245 
246 #define SNIC_ICMND_PRI_SHIFT		5	/* prio val starts at bit 5 */
247 
248 /*
249  * snic_icmnd : host-> firmware request
250  *
251  * used for sending out an initiator SCSI 16/32-byte command
252  */
253 struct snic_icmnd {
254 	__le16	sg_cnt;		/* Number of SG Elements */
255 	__le16	flags;		/* flags */
256 	__le32	sense_len;	/* Sense buffer length */
257 	__le64	tgt_id;		/* Destination Target ID */
258 	__le64	lun_id;		/* Destination LUN ID */
259 	u8	cdb_len;
260 	u8	_resvd;
261 	__le16	time_out;	/* ms time for Res allocations fw to handle io*/
262 	__le32	data_len;	/* Total number of bytes to be transferred */
263 	u8	cdb[SNIC_CDB_LEN];
264 	__le64	sg_addr;	/* Points to SG List */
265 	__le64	sense_addr;	/* Sense buffer address */
266 };
267 
268 
269 /* Response flags */
270 /* Bit 0: Under run
271  * Bit 1: Over Run
272  * Bit 2-7: Reserved
273  */
274 #define SNIC_ICMND_CMPL_UNDR_RUN	0x01	/* resid under and valid */
275 #define SNIC_ICMND_CMPL_OVER_RUN	0x02	/* resid over and valid */
276 
277 /*
278  * snic_icmnd_cmpl: firmware -> host response
279  *
280  * Used for sending the host a response to an icmnd (initiator command)
281  */
282 struct snic_icmnd_cmpl {
283 	u8	scsi_status;	/* value as per SAM */
284 	u8	flags;
285 	__le16	sense_len;	/* Sense Length */
286 	__le32	resid;		/* Residue : # bytes under or over run */
287 };
288 
289 /*
290  * snic_itmf: host->firmware request
291  *
292  * used for requesting the firmware to abort a request and/or send out
293  * a task management function
294  *
295  * the req_id field is valid in case of abort task and clear task
296  */
297 struct snic_itmf {
298 	u8	tm_type;	/* SCSI Task Management request */
299 	u8	resvd;
300 	__le16	flags;		/* flags */
301 	__le32	req_id;		/* Command id of snic req to be aborted */
302 	__le64	tgt_id;		/* Target ID */
303 	__le64	lun_id;		/* Destination LUN ID */
304 	__le16	timeout;	/* in sec */
305 };
306 
307 /*
308  * Task Management Request
309  */
310 enum snic_itmf_tm_type {
311 	SNIC_ITMF_ABTS_TASK = 0x01,	/* Abort Task */
312 	SNIC_ITMF_ABTS_TASK_SET,	/* Abort Task Set */
313 	SNIC_ITMF_CLR_TASK,		/* Clear Task */
314 	SNIC_ITMF_CLR_TASKSET,		/* Clear Task Set */
315 	SNIC_ITMF_LUN_RESET,		/* Lun Reset */
316 	SNIC_ITMF_ABTS_TASK_TERM,	/* Supported for SAN Targets */
317 };
318 
319 /*
320  * snic_itmf_cmpl: firmware -> host resposne
321  *
322  * used for sending the host a response for a itmf request
323  */
324 struct snic_itmf_cmpl {
325 	__le32	nterminated;	/* # IOs terminated as a result of tmf */
326 	u8	flags;		/* flags */
327 	u8	_resvd[3];
328 };
329 
330 /*
331  * itmfl_cmpl flags
332  * Bit 0 : 1 - Num terminated field valid
333  * Bit 1 - 7 : Reserved
334  */
335 #define SNIC_NUM_TERM_VALID	0x01	/* Number of IOs terminated */
336 
337 /*
338  * snic_hba_reset: host -> firmware request
339  *
340  * used for requesting firmware to reset snic
341  */
342 struct snic_hba_reset {
343 	__le16	flags;		/* flags */
344 	u8	_resvd[6];
345 };
346 
347 /*
348  * snic_hba_reset_cmpl: firmware -> host response
349  *
350  * Used by firmware to respond to the host's hba reset request
351  */
352 struct snic_hba_reset_cmpl {
353 	u8	flags;		/* flags : more info needs to be added*/
354 	u8	_resvd[7];
355 };
356 
357 /*
358  * snic_notify_msg: firmware -> host response
359  *
360  * Used by firmware to notify host of the last work queue entry received
361  */
362 struct snic_notify_msg {
363 	__le32	wqe_num;	/* wq entry number */
364 	u8	flags;		/* flags, macros */
365 	u8	_resvd[4];
366 };
367 
368 
369 #define SNIC_EVDATA_LEN		24	/* in bytes */
370 /* snic_async_evnotify: firmware -> host notification
371  *
372  * Used by firmware to notify the host about configuration/state changes
373  */
374 struct snic_async_evnotify {
375 	u8	FLS_EVENT_DESC;
376 	u8	vnic;			/* vnic id */
377 	u8	_resvd[2];
378 	__le32	ev_id;			/* Event ID */
379 	u8	ev_data[SNIC_EVDATA_LEN]; /* Event Data */
380 	u8	_resvd2[4];
381 };
382 
383 /* async event flags */
384 enum snic_ev_type {
385 	SNIC_EV_TGT_OFFLINE = 0x01, /* Target Offline, PL contains TGT ID */
386 	SNIC_EV_TGT_ONLINE,	/* Target Online, PL contains TGT ID */
387 	SNIC_EV_LUN_OFFLINE,	/* LUN Offline, PL contains LUN ID */
388 	SNIC_EV_LUN_ONLINE,	/* LUN Online, PL contains LUN ID */
389 	SNIC_EV_CONF_CHG,	/* Dev Config/Attr Change Event */
390 	SNIC_EV_TGT_ADDED,	/* Target Added */
391 	SNIC_EV_TGT_DELTD,	/* Target Del'd, PL contains TGT ID */
392 	SNIC_EV_LUN_ADDED,	/* LUN Added */
393 	SNIC_EV_LUN_DELTD,	/* LUN Del'd, PL cont. TGT & LUN ID */
394 
395 	SNIC_EV_DISC_CMPL = 0x10, /* Discovery Completed Event */
396 };
397 
398 
399 #define SNIC_HOST_REQ_LEN	128	/*Exp length of host req, wq desc sz*/
400 /* Payload 88 bytes = 128 - 24 - 16 */
401 #define SNIC_HOST_REQ_PAYLOAD	((int)(SNIC_HOST_REQ_LEN -		\
402 					sizeof(struct snic_io_hdr) -	\
403 					(2 * sizeof(u64)) - sizeof(ulong)))
404 
405 /*
406  * snic_host_req: host -> firmware request
407  *
408  * Basic structure for all snic requests that are sent from the host to
409  * firmware. They are 128 bytes in size.
410  */
411 struct snic_host_req {
412 	u64	ctrl_data[2];	/*16 bytes - Control Data */
413 	struct snic_io_hdr hdr;
414 	union {
415 		/*
416 		 * Entry specific space, last byte contains color
417 		 */
418 		u8	buf[SNIC_HOST_REQ_PAYLOAD];
419 
420 		/*
421 		 * Exchange firmware version
422 		 */
423 		struct snic_exch_ver_req	exch_ver;
424 
425 		/* report targets */
426 		struct snic_report_tgts		rpt_tgts;
427 
428 		/* io request */
429 		struct snic_icmnd		icmnd;
430 
431 		/* task management request */
432 		struct snic_itmf		itmf;
433 
434 		/* hba reset */
435 		struct snic_hba_reset		reset;
436 	} u;
437 
438 	ulong req_pa;
439 }; /* end of snic_host_req structure */
440 
441 
442 #define SNIC_FW_REQ_LEN		64 /* Expected length of fw req */
443 struct snic_fw_req {
444 	struct snic_io_hdr hdr;
445 	union {
446 		/*
447 		 * Entry specific space, last byte contains color
448 		 */
449 		u8	buf[SNIC_FW_REQ_LEN - sizeof(struct snic_io_hdr)];
450 
451 		/* Exchange Version Response */
452 		struct snic_exch_ver_rsp	exch_ver_cmpl;
453 
454 		/* Report Targets Response */
455 		struct snic_report_tgts_cmpl	rpt_tgts_cmpl;
456 
457 		/* scsi response */
458 		struct snic_icmnd_cmpl		icmnd_cmpl;
459 
460 		/* task management response */
461 		struct snic_itmf_cmpl		itmf_cmpl;
462 
463 		/* hba reset response */
464 		struct snic_hba_reset_cmpl	reset_cmpl;
465 
466 		/* notify message */
467 		struct snic_notify_msg		ack;
468 
469 		/* async notification event */
470 		struct snic_async_evnotify	async_ev;
471 
472 	} u;
473 }; /* end of snic_fw_req structure */
474 
475 /*
476  * Auxillary macro to verify specific snic req/cmpl structures
477  * to ensure that it will be aligned to 64 bit, and not using
478  * color bit field
479  */
480 #define VERIFY_REQ_SZ(x)
481 #define VERIFY_CMPL_SZ(x)
482 
483 /*
484  * Access routines to encode and decode the color bit, which is the most
485  * significant bit of the structure.
486  */
487 static inline void
snic_color_enc(struct snic_fw_req * req,u8 color)488 snic_color_enc(struct snic_fw_req *req, u8 color)
489 {
490 	u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
491 
492 	if (color)
493 		*c |= 0x80;
494 	else
495 		*c &= ~0x80;
496 }
497 
498 static inline void
snic_color_dec(struct snic_fw_req * req,u8 * color)499 snic_color_dec(struct snic_fw_req *req, u8 *color)
500 {
501 	u8 *c = ((u8 *) req) + sizeof(struct snic_fw_req) - 1;
502 
503 	*color = *c >> 7;
504 
505 	/* Make sure color bit is read from desc *before* other fields
506 	 * are read from desc. Hardware guarantees color bit is last
507 	 * bit (byte) written. Adding the rmb() prevents the compiler
508 	 * and/or CPU from reordering the reads which would potentially
509 	 * result in reading stale values.
510 	 */
511 	rmb();
512 }
513 #endif /* end of __SNIC_FWINT_H */
514