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1337e6b9 | 1 | /* Intel Ethernet Switch Host Interface Driver |
a4bcea83 | 2 | * Copyright(c) 2013 - 2015 Intel Corporation. |
1337e6b9 AD |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * The full GNU General Public License is included in this distribution in | |
14 | * the file called "COPYING". | |
15 | * | |
16 | * Contact Information: | |
17 | * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> | |
18 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
19 | */ | |
20 | ||
21 | #include "fm10k_common.h" | |
22 | ||
23 | /** | |
24 | * fm10k_fifo_init - Initialize a message FIFO | |
25 | * @fifo: pointer to FIFO | |
26 | * @buffer: pointer to memory to be used to store FIFO | |
27 | * @size: maximum message size to store in FIFO, must be 2^n - 1 | |
28 | **/ | |
29 | static void fm10k_fifo_init(struct fm10k_mbx_fifo *fifo, u32 *buffer, u16 size) | |
30 | { | |
31 | fifo->buffer = buffer; | |
32 | fifo->size = size; | |
33 | fifo->head = 0; | |
34 | fifo->tail = 0; | |
35 | } | |
36 | ||
37 | /** | |
38 | * fm10k_fifo_used - Retrieve used space in FIFO | |
39 | * @fifo: pointer to FIFO | |
40 | * | |
41 | * This function returns the number of DWORDs used in the FIFO | |
42 | **/ | |
43 | static u16 fm10k_fifo_used(struct fm10k_mbx_fifo *fifo) | |
44 | { | |
45 | return fifo->tail - fifo->head; | |
46 | } | |
47 | ||
48 | /** | |
49 | * fm10k_fifo_unused - Retrieve unused space in FIFO | |
50 | * @fifo: pointer to FIFO | |
51 | * | |
52 | * This function returns the number of unused DWORDs in the FIFO | |
53 | **/ | |
54 | static u16 fm10k_fifo_unused(struct fm10k_mbx_fifo *fifo) | |
55 | { | |
56 | return fifo->size + fifo->head - fifo->tail; | |
57 | } | |
58 | ||
59 | /** | |
60 | * fm10k_fifo_empty - Test to verify if fifo is empty | |
61 | * @fifo: pointer to FIFO | |
62 | * | |
63 | * This function returns true if the FIFO is empty, else false | |
64 | **/ | |
65 | static bool fm10k_fifo_empty(struct fm10k_mbx_fifo *fifo) | |
66 | { | |
67 | return fifo->head == fifo->tail; | |
68 | } | |
69 | ||
70 | /** | |
71 | * fm10k_fifo_head_offset - returns indices of head with given offset | |
72 | * @fifo: pointer to FIFO | |
73 | * @offset: offset to add to head | |
74 | * | |
eca32047 | 75 | * This function returns the indices into the fifo based on head + offset |
1337e6b9 AD |
76 | **/ |
77 | static u16 fm10k_fifo_head_offset(struct fm10k_mbx_fifo *fifo, u16 offset) | |
78 | { | |
79 | return (fifo->head + offset) & (fifo->size - 1); | |
80 | } | |
81 | ||
82 | /** | |
83 | * fm10k_fifo_tail_offset - returns indices of tail with given offset | |
84 | * @fifo: pointer to FIFO | |
85 | * @offset: offset to add to tail | |
86 | * | |
eca32047 | 87 | * This function returns the indices into the fifo based on tail + offset |
1337e6b9 AD |
88 | **/ |
89 | static u16 fm10k_fifo_tail_offset(struct fm10k_mbx_fifo *fifo, u16 offset) | |
90 | { | |
91 | return (fifo->tail + offset) & (fifo->size - 1); | |
92 | } | |
93 | ||
94 | /** | |
95 | * fm10k_fifo_head_len - Retrieve length of first message in FIFO | |
96 | * @fifo: pointer to FIFO | |
97 | * | |
98 | * This function returns the size of the first message in the FIFO | |
99 | **/ | |
100 | static u16 fm10k_fifo_head_len(struct fm10k_mbx_fifo *fifo) | |
101 | { | |
102 | u32 *head = fifo->buffer + fm10k_fifo_head_offset(fifo, 0); | |
103 | ||
104 | /* verify there is at least 1 DWORD in the fifo so *head is valid */ | |
105 | if (fm10k_fifo_empty(fifo)) | |
106 | return 0; | |
107 | ||
108 | /* retieve the message length */ | |
109 | return FM10K_TLV_DWORD_LEN(*head); | |
110 | } | |
111 | ||
112 | /** | |
113 | * fm10k_fifo_head_drop - Drop the first message in FIFO | |
114 | * @fifo: pointer to FIFO | |
115 | * | |
116 | * This function returns the size of the message dropped from the FIFO | |
117 | **/ | |
118 | static u16 fm10k_fifo_head_drop(struct fm10k_mbx_fifo *fifo) | |
119 | { | |
120 | u16 len = fm10k_fifo_head_len(fifo); | |
121 | ||
122 | /* update head so it is at the start of next frame */ | |
123 | fifo->head += len; | |
124 | ||
125 | return len; | |
126 | } | |
127 | ||
78288e37 JK |
128 | /** |
129 | * fm10k_fifo_drop_all - Drop all messages in FIFO | |
130 | * @fifo: pointer to FIFO | |
131 | * | |
15aa49cb JK |
132 | * This function resets the head pointer to drop all messages in the FIFO and |
133 | * ensure the FIFO is empty. | |
78288e37 JK |
134 | **/ |
135 | static void fm10k_fifo_drop_all(struct fm10k_mbx_fifo *fifo) | |
136 | { | |
137 | fifo->head = fifo->tail; | |
138 | } | |
139 | ||
1337e6b9 AD |
140 | /** |
141 | * fm10k_mbx_index_len - Convert a head/tail index into a length value | |
142 | * @mbx: pointer to mailbox | |
143 | * @head: head index | |
144 | * @tail: head index | |
145 | * | |
146 | * This function takes the head and tail index and determines the length | |
147 | * of the data indicated by this pair. | |
148 | **/ | |
149 | static u16 fm10k_mbx_index_len(struct fm10k_mbx_info *mbx, u16 head, u16 tail) | |
150 | { | |
151 | u16 len = tail - head; | |
152 | ||
153 | /* we wrapped so subtract 2, one for index 0, one for all 1s index */ | |
154 | if (len > tail) | |
155 | len -= 2; | |
156 | ||
157 | return len & ((mbx->mbmem_len << 1) - 1); | |
158 | } | |
159 | ||
160 | /** | |
161 | * fm10k_mbx_tail_add - Determine new tail value with added offset | |
162 | * @mbx: pointer to mailbox | |
163 | * @offset: length to add to head offset | |
164 | * | |
165 | * This function takes the local tail index and recomputes it for | |
166 | * a given length added as an offset. | |
167 | **/ | |
168 | static u16 fm10k_mbx_tail_add(struct fm10k_mbx_info *mbx, u16 offset) | |
169 | { | |
170 | u16 tail = (mbx->tail + offset + 1) & ((mbx->mbmem_len << 1) - 1); | |
171 | ||
172 | /* add/sub 1 because we cannot have offset 0 or all 1s */ | |
173 | return (tail > mbx->tail) ? --tail : ++tail; | |
174 | } | |
175 | ||
176 | /** | |
177 | * fm10k_mbx_tail_sub - Determine new tail value with subtracted offset | |
178 | * @mbx: pointer to mailbox | |
179 | * @offset: length to add to head offset | |
180 | * | |
181 | * This function takes the local tail index and recomputes it for | |
182 | * a given length added as an offset. | |
183 | **/ | |
184 | static u16 fm10k_mbx_tail_sub(struct fm10k_mbx_info *mbx, u16 offset) | |
185 | { | |
186 | u16 tail = (mbx->tail - offset - 1) & ((mbx->mbmem_len << 1) - 1); | |
187 | ||
188 | /* sub/add 1 because we cannot have offset 0 or all 1s */ | |
189 | return (tail < mbx->tail) ? ++tail : --tail; | |
190 | } | |
191 | ||
192 | /** | |
193 | * fm10k_mbx_head_add - Determine new head value with added offset | |
194 | * @mbx: pointer to mailbox | |
195 | * @offset: length to add to head offset | |
196 | * | |
197 | * This function takes the local head index and recomputes it for | |
198 | * a given length added as an offset. | |
199 | **/ | |
200 | static u16 fm10k_mbx_head_add(struct fm10k_mbx_info *mbx, u16 offset) | |
201 | { | |
202 | u16 head = (mbx->head + offset + 1) & ((mbx->mbmem_len << 1) - 1); | |
203 | ||
204 | /* add/sub 1 because we cannot have offset 0 or all 1s */ | |
205 | return (head > mbx->head) ? --head : ++head; | |
206 | } | |
207 | ||
208 | /** | |
209 | * fm10k_mbx_head_sub - Determine new head value with subtracted offset | |
210 | * @mbx: pointer to mailbox | |
211 | * @offset: length to add to head offset | |
212 | * | |
213 | * This function takes the local head index and recomputes it for | |
214 | * a given length added as an offset. | |
215 | **/ | |
216 | static u16 fm10k_mbx_head_sub(struct fm10k_mbx_info *mbx, u16 offset) | |
217 | { | |
218 | u16 head = (mbx->head - offset - 1) & ((mbx->mbmem_len << 1) - 1); | |
219 | ||
220 | /* sub/add 1 because we cannot have offset 0 or all 1s */ | |
221 | return (head < mbx->head) ? ++head : --head; | |
222 | } | |
223 | ||
224 | /** | |
225 | * fm10k_mbx_pushed_tail_len - Retrieve the length of message being pushed | |
226 | * @mbx: pointer to mailbox | |
227 | * | |
228 | * This function will return the length of the message currently being | |
229 | * pushed onto the tail of the Rx queue. | |
230 | **/ | |
231 | static u16 fm10k_mbx_pushed_tail_len(struct fm10k_mbx_info *mbx) | |
232 | { | |
233 | u32 *tail = mbx->rx.buffer + fm10k_fifo_tail_offset(&mbx->rx, 0); | |
234 | ||
235 | /* pushed tail is only valid if pushed is set */ | |
236 | if (!mbx->pushed) | |
237 | return 0; | |
238 | ||
239 | return FM10K_TLV_DWORD_LEN(*tail); | |
240 | } | |
241 | ||
242 | /** | |
243 | * fm10k_fifo_write_copy - pulls data off of msg and places it in fifo | |
244 | * @fifo: pointer to FIFO | |
245 | * @msg: message array to populate | |
246 | * @tail_offset: additional offset to add to tail pointer | |
247 | * @len: length of FIFO to copy into message header | |
248 | * | |
249 | * This function will take a message and copy it into a section of the | |
250 | * FIFO. In order to get something into a location other than just | |
251 | * the tail you can use tail_offset to adjust the pointer. | |
252 | **/ | |
253 | static void fm10k_fifo_write_copy(struct fm10k_mbx_fifo *fifo, | |
254 | const u32 *msg, u16 tail_offset, u16 len) | |
255 | { | |
256 | u16 end = fm10k_fifo_tail_offset(fifo, tail_offset); | |
257 | u32 *tail = fifo->buffer + end; | |
258 | ||
259 | /* track when we should cross the end of the FIFO */ | |
260 | end = fifo->size - end; | |
261 | ||
262 | /* copy end of message before start of message */ | |
263 | if (end < len) | |
264 | memcpy(fifo->buffer, msg + end, (len - end) << 2); | |
265 | else | |
266 | end = len; | |
267 | ||
268 | /* Copy remaining message into Tx FIFO */ | |
269 | memcpy(tail, msg, end << 2); | |
270 | } | |
271 | ||
272 | /** | |
273 | * fm10k_fifo_enqueue - Enqueues the message to the tail of the FIFO | |
274 | * @fifo: pointer to FIFO | |
275 | * @msg: message array to read | |
276 | * | |
277 | * This function enqueues a message up to the size specified by the length | |
278 | * contained in the first DWORD of the message and will place at the tail | |
279 | * of the FIFO. It will return 0 on success, or a negative value on error. | |
280 | **/ | |
281 | static s32 fm10k_fifo_enqueue(struct fm10k_mbx_fifo *fifo, const u32 *msg) | |
282 | { | |
283 | u16 len = FM10K_TLV_DWORD_LEN(*msg); | |
284 | ||
285 | /* verify parameters */ | |
286 | if (len > fifo->size) | |
287 | return FM10K_MBX_ERR_SIZE; | |
288 | ||
289 | /* verify there is room for the message */ | |
290 | if (len > fm10k_fifo_unused(fifo)) | |
291 | return FM10K_MBX_ERR_NO_SPACE; | |
292 | ||
293 | /* Copy message into FIFO */ | |
294 | fm10k_fifo_write_copy(fifo, msg, 0, len); | |
295 | ||
296 | /* memory barrier to guarantee FIFO is written before tail update */ | |
297 | wmb(); | |
298 | ||
299 | /* Update Tx FIFO tail */ | |
300 | fifo->tail += len; | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | /** | |
306 | * fm10k_mbx_validate_msg_size - Validate incoming message based on size | |
307 | * @mbx: pointer to mailbox | |
308 | * @len: length of data pushed onto buffer | |
309 | * | |
310 | * This function analyzes the frame and will return a non-zero value when | |
311 | * the start of a message larger than the mailbox is detected. | |
312 | **/ | |
313 | static u16 fm10k_mbx_validate_msg_size(struct fm10k_mbx_info *mbx, u16 len) | |
314 | { | |
315 | struct fm10k_mbx_fifo *fifo = &mbx->rx; | |
316 | u16 total_len = 0, msg_len; | |
317 | u32 *msg; | |
318 | ||
319 | /* length should include previous amounts pushed */ | |
320 | len += mbx->pushed; | |
321 | ||
322 | /* offset in message is based off of current message size */ | |
323 | do { | |
324 | msg = fifo->buffer + fm10k_fifo_tail_offset(fifo, total_len); | |
325 | msg_len = FM10K_TLV_DWORD_LEN(*msg); | |
326 | total_len += msg_len; | |
327 | } while (total_len < len); | |
328 | ||
329 | /* message extends out of pushed section, but fits in FIFO */ | |
da61b367 | 330 | if ((len < total_len) && (msg_len <= mbx->max_size)) |
1337e6b9 AD |
331 | return 0; |
332 | ||
333 | /* return length of invalid section */ | |
334 | return (len < total_len) ? len : (len - total_len); | |
335 | } | |
336 | ||
337 | /** | |
338 | * fm10k_mbx_write_copy - pulls data off of Tx FIFO and places it in mbmem | |
339 | * @mbx: pointer to mailbox | |
340 | * | |
41857562 | 341 | * This function will take a section of the Tx FIFO and copy it into the |
1337e6b9 AD |
342 | * mailbox memory. The offset in mbmem is based on the lower bits of the |
343 | * tail and len determines the length to copy. | |
344 | **/ | |
345 | static void fm10k_mbx_write_copy(struct fm10k_hw *hw, | |
346 | struct fm10k_mbx_info *mbx) | |
347 | { | |
348 | struct fm10k_mbx_fifo *fifo = &mbx->tx; | |
349 | u32 mbmem = mbx->mbmem_reg; | |
350 | u32 *head = fifo->buffer; | |
351 | u16 end, len, tail, mask; | |
352 | ||
353 | if (!mbx->tail_len) | |
354 | return; | |
355 | ||
356 | /* determine data length and mbmem tail index */ | |
357 | mask = mbx->mbmem_len - 1; | |
358 | len = mbx->tail_len; | |
359 | tail = fm10k_mbx_tail_sub(mbx, len); | |
360 | if (tail > mask) | |
361 | tail++; | |
362 | ||
363 | /* determine offset in the ring */ | |
364 | end = fm10k_fifo_head_offset(fifo, mbx->pulled); | |
365 | head += end; | |
366 | ||
367 | /* memory barrier to guarantee data is ready to be read */ | |
368 | rmb(); | |
369 | ||
370 | /* Copy message from Tx FIFO */ | |
371 | for (end = fifo->size - end; len; head = fifo->buffer) { | |
372 | do { | |
373 | /* adjust tail to match offset for FIFO */ | |
374 | tail &= mask; | |
375 | if (!tail) | |
376 | tail++; | |
377 | ||
17d39fac JK |
378 | mbx->tx_mbmem_pulled++; |
379 | ||
1337e6b9 AD |
380 | /* write message to hardware FIFO */ |
381 | fm10k_write_reg(hw, mbmem + tail++, *(head++)); | |
382 | } while (--len && --end); | |
383 | } | |
384 | } | |
385 | ||
386 | /** | |
387 | * fm10k_mbx_pull_head - Pulls data off of head of Tx FIFO | |
388 | * @hw: pointer to hardware structure | |
389 | * @mbx: pointer to mailbox | |
390 | * @head: acknowledgement number last received | |
391 | * | |
392 | * This function will push the tail index forward based on the remote | |
393 | * head index. It will then pull up to mbmem_len DWORDs off of the | |
394 | * head of the FIFO and will place it in the MBMEM registers | |
395 | * associated with the mailbox. | |
396 | **/ | |
397 | static void fm10k_mbx_pull_head(struct fm10k_hw *hw, | |
398 | struct fm10k_mbx_info *mbx, u16 head) | |
399 | { | |
400 | u16 mbmem_len, len, ack = fm10k_mbx_index_len(mbx, head, mbx->tail); | |
401 | struct fm10k_mbx_fifo *fifo = &mbx->tx; | |
402 | ||
403 | /* update number of bytes pulled and update bytes in transit */ | |
404 | mbx->pulled += mbx->tail_len - ack; | |
405 | ||
406 | /* determine length of data to pull, reserve space for mbmem header */ | |
407 | mbmem_len = mbx->mbmem_len - 1; | |
408 | len = fm10k_fifo_used(fifo) - mbx->pulled; | |
409 | if (len > mbmem_len) | |
410 | len = mbmem_len; | |
411 | ||
412 | /* update tail and record number of bytes in transit */ | |
413 | mbx->tail = fm10k_mbx_tail_add(mbx, len - ack); | |
414 | mbx->tail_len = len; | |
415 | ||
416 | /* drop pulled messages from the FIFO */ | |
417 | for (len = fm10k_fifo_head_len(fifo); | |
418 | len && (mbx->pulled >= len); | |
419 | len = fm10k_fifo_head_len(fifo)) { | |
420 | mbx->pulled -= fm10k_fifo_head_drop(fifo); | |
421 | mbx->tx_messages++; | |
422 | mbx->tx_dwords += len; | |
423 | } | |
424 | ||
425 | /* Copy message out from the Tx FIFO */ | |
426 | fm10k_mbx_write_copy(hw, mbx); | |
427 | } | |
428 | ||
429 | /** | |
430 | * fm10k_mbx_read_copy - pulls data off of mbmem and places it in Rx FIFO | |
431 | * @hw: pointer to hardware structure | |
432 | * @mbx: pointer to mailbox | |
433 | * | |
eca32047 | 434 | * This function will take a section of the mailbox memory and copy it |
1337e6b9 AD |
435 | * into the Rx FIFO. The offset is based on the lower bits of the |
436 | * head and len determines the length to copy. | |
437 | **/ | |
438 | static void fm10k_mbx_read_copy(struct fm10k_hw *hw, | |
439 | struct fm10k_mbx_info *mbx) | |
440 | { | |
441 | struct fm10k_mbx_fifo *fifo = &mbx->rx; | |
442 | u32 mbmem = mbx->mbmem_reg ^ mbx->mbmem_len; | |
443 | u32 *tail = fifo->buffer; | |
444 | u16 end, len, head; | |
445 | ||
446 | /* determine data length and mbmem head index */ | |
447 | len = mbx->head_len; | |
448 | head = fm10k_mbx_head_sub(mbx, len); | |
449 | if (head >= mbx->mbmem_len) | |
450 | head++; | |
451 | ||
452 | /* determine offset in the ring */ | |
453 | end = fm10k_fifo_tail_offset(fifo, mbx->pushed); | |
454 | tail += end; | |
455 | ||
456 | /* Copy message into Rx FIFO */ | |
457 | for (end = fifo->size - end; len; tail = fifo->buffer) { | |
458 | do { | |
459 | /* adjust head to match offset for FIFO */ | |
460 | head &= mbx->mbmem_len - 1; | |
461 | if (!head) | |
462 | head++; | |
463 | ||
17d39fac JK |
464 | mbx->rx_mbmem_pushed++; |
465 | ||
1337e6b9 AD |
466 | /* read message from hardware FIFO */ |
467 | *(tail++) = fm10k_read_reg(hw, mbmem + head++); | |
468 | } while (--len && --end); | |
469 | } | |
470 | ||
471 | /* memory barrier to guarantee FIFO is written before tail update */ | |
472 | wmb(); | |
473 | } | |
474 | ||
475 | /** | |
476 | * fm10k_mbx_push_tail - Pushes up to 15 DWORDs on to tail of FIFO | |
477 | * @hw: pointer to hardware structure | |
478 | * @mbx: pointer to mailbox | |
479 | * @tail: tail index of message | |
480 | * | |
481 | * This function will first validate the tail index and size for the | |
eca32047 | 482 | * incoming message. It then updates the acknowledgment number and |
1337e6b9 AD |
483 | * copies the data into the FIFO. It will return the number of messages |
484 | * dequeued on success and a negative value on error. | |
485 | **/ | |
486 | static s32 fm10k_mbx_push_tail(struct fm10k_hw *hw, | |
487 | struct fm10k_mbx_info *mbx, | |
488 | u16 tail) | |
489 | { | |
490 | struct fm10k_mbx_fifo *fifo = &mbx->rx; | |
491 | u16 len, seq = fm10k_mbx_index_len(mbx, mbx->head, tail); | |
492 | ||
493 | /* determine length of data to push */ | |
494 | len = fm10k_fifo_unused(fifo) - mbx->pushed; | |
495 | if (len > seq) | |
496 | len = seq; | |
497 | ||
498 | /* update head and record bytes received */ | |
499 | mbx->head = fm10k_mbx_head_add(mbx, len); | |
500 | mbx->head_len = len; | |
501 | ||
502 | /* nothing to do if there is no data */ | |
503 | if (!len) | |
504 | return 0; | |
505 | ||
506 | /* Copy msg into Rx FIFO */ | |
507 | fm10k_mbx_read_copy(hw, mbx); | |
508 | ||
509 | /* determine if there are any invalid lengths in message */ | |
510 | if (fm10k_mbx_validate_msg_size(mbx, len)) | |
511 | return FM10K_MBX_ERR_SIZE; | |
512 | ||
513 | /* Update pushed */ | |
514 | mbx->pushed += len; | |
515 | ||
516 | /* flush any completed messages */ | |
517 | for (len = fm10k_mbx_pushed_tail_len(mbx); | |
518 | len && (mbx->pushed >= len); | |
519 | len = fm10k_mbx_pushed_tail_len(mbx)) { | |
520 | fifo->tail += len; | |
521 | mbx->pushed -= len; | |
522 | mbx->rx_messages++; | |
523 | mbx->rx_dwords += len; | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
b651957c AD |
529 | /* pre-generated data for generating the CRC based on the poly 0xAC9A. */ |
530 | static const u16 fm10k_crc_16b_table[256] = { | |
531 | 0x0000, 0x7956, 0xF2AC, 0x8BFA, 0xBC6D, 0xC53B, 0x4EC1, 0x3797, | |
532 | 0x21EF, 0x58B9, 0xD343, 0xAA15, 0x9D82, 0xE4D4, 0x6F2E, 0x1678, | |
533 | 0x43DE, 0x3A88, 0xB172, 0xC824, 0xFFB3, 0x86E5, 0x0D1F, 0x7449, | |
534 | 0x6231, 0x1B67, 0x909D, 0xE9CB, 0xDE5C, 0xA70A, 0x2CF0, 0x55A6, | |
535 | 0x87BC, 0xFEEA, 0x7510, 0x0C46, 0x3BD1, 0x4287, 0xC97D, 0xB02B, | |
536 | 0xA653, 0xDF05, 0x54FF, 0x2DA9, 0x1A3E, 0x6368, 0xE892, 0x91C4, | |
537 | 0xC462, 0xBD34, 0x36CE, 0x4F98, 0x780F, 0x0159, 0x8AA3, 0xF3F5, | |
538 | 0xE58D, 0x9CDB, 0x1721, 0x6E77, 0x59E0, 0x20B6, 0xAB4C, 0xD21A, | |
539 | 0x564D, 0x2F1B, 0xA4E1, 0xDDB7, 0xEA20, 0x9376, 0x188C, 0x61DA, | |
540 | 0x77A2, 0x0EF4, 0x850E, 0xFC58, 0xCBCF, 0xB299, 0x3963, 0x4035, | |
541 | 0x1593, 0x6CC5, 0xE73F, 0x9E69, 0xA9FE, 0xD0A8, 0x5B52, 0x2204, | |
542 | 0x347C, 0x4D2A, 0xC6D0, 0xBF86, 0x8811, 0xF147, 0x7ABD, 0x03EB, | |
543 | 0xD1F1, 0xA8A7, 0x235D, 0x5A0B, 0x6D9C, 0x14CA, 0x9F30, 0xE666, | |
544 | 0xF01E, 0x8948, 0x02B2, 0x7BE4, 0x4C73, 0x3525, 0xBEDF, 0xC789, | |
545 | 0x922F, 0xEB79, 0x6083, 0x19D5, 0x2E42, 0x5714, 0xDCEE, 0xA5B8, | |
546 | 0xB3C0, 0xCA96, 0x416C, 0x383A, 0x0FAD, 0x76FB, 0xFD01, 0x8457, | |
547 | 0xAC9A, 0xD5CC, 0x5E36, 0x2760, 0x10F7, 0x69A1, 0xE25B, 0x9B0D, | |
548 | 0x8D75, 0xF423, 0x7FD9, 0x068F, 0x3118, 0x484E, 0xC3B4, 0xBAE2, | |
549 | 0xEF44, 0x9612, 0x1DE8, 0x64BE, 0x5329, 0x2A7F, 0xA185, 0xD8D3, | |
550 | 0xCEAB, 0xB7FD, 0x3C07, 0x4551, 0x72C6, 0x0B90, 0x806A, 0xF93C, | |
551 | 0x2B26, 0x5270, 0xD98A, 0xA0DC, 0x974B, 0xEE1D, 0x65E7, 0x1CB1, | |
552 | 0x0AC9, 0x739F, 0xF865, 0x8133, 0xB6A4, 0xCFF2, 0x4408, 0x3D5E, | |
553 | 0x68F8, 0x11AE, 0x9A54, 0xE302, 0xD495, 0xADC3, 0x2639, 0x5F6F, | |
554 | 0x4917, 0x3041, 0xBBBB, 0xC2ED, 0xF57A, 0x8C2C, 0x07D6, 0x7E80, | |
555 | 0xFAD7, 0x8381, 0x087B, 0x712D, 0x46BA, 0x3FEC, 0xB416, 0xCD40, | |
556 | 0xDB38, 0xA26E, 0x2994, 0x50C2, 0x6755, 0x1E03, 0x95F9, 0xECAF, | |
557 | 0xB909, 0xC05F, 0x4BA5, 0x32F3, 0x0564, 0x7C32, 0xF7C8, 0x8E9E, | |
558 | 0x98E6, 0xE1B0, 0x6A4A, 0x131C, 0x248B, 0x5DDD, 0xD627, 0xAF71, | |
559 | 0x7D6B, 0x043D, 0x8FC7, 0xF691, 0xC106, 0xB850, 0x33AA, 0x4AFC, | |
560 | 0x5C84, 0x25D2, 0xAE28, 0xD77E, 0xE0E9, 0x99BF, 0x1245, 0x6B13, | |
561 | 0x3EB5, 0x47E3, 0xCC19, 0xB54F, 0x82D8, 0xFB8E, 0x7074, 0x0922, | |
562 | 0x1F5A, 0x660C, 0xEDF6, 0x94A0, 0xA337, 0xDA61, 0x519B, 0x28CD }; | |
563 | ||
564 | /** | |
565 | * fm10k_crc_16b - Generate a 16 bit CRC for a region of 16 bit data | |
566 | * @data: pointer to data to process | |
567 | * @seed: seed value for CRC | |
568 | * @len: length measured in 16 bits words | |
569 | * | |
570 | * This function will generate a CRC based on the polynomial 0xAC9A and | |
571 | * whatever value is stored in the seed variable. Note that this | |
572 | * value inverts the local seed and the result in order to capture all | |
573 | * leading and trailing zeros. | |
574 | */ | |
575 | static u16 fm10k_crc_16b(const u32 *data, u16 seed, u16 len) | |
576 | { | |
577 | u32 result = seed; | |
578 | ||
579 | while (len--) { | |
580 | result ^= *(data++); | |
581 | result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; | |
582 | result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; | |
583 | ||
584 | if (!(len--)) | |
585 | break; | |
586 | ||
587 | result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; | |
588 | result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; | |
589 | } | |
590 | ||
591 | return (u16)result; | |
592 | } | |
593 | ||
594 | /** | |
595 | * fm10k_fifo_crc - generate a CRC based off of FIFO data | |
596 | * @fifo: pointer to FIFO | |
597 | * @offset: offset point for start of FIFO | |
598 | * @len: number of DWORDS words to process | |
599 | * @seed: seed value for CRC | |
600 | * | |
601 | * This function generates a CRC for some region of the FIFO | |
602 | **/ | |
603 | static u16 fm10k_fifo_crc(struct fm10k_mbx_fifo *fifo, u16 offset, | |
604 | u16 len, u16 seed) | |
605 | { | |
606 | u32 *data = fifo->buffer + offset; | |
607 | ||
608 | /* track when we should cross the end of the FIFO */ | |
609 | offset = fifo->size - offset; | |
610 | ||
611 | /* if we are in 2 blocks process the end of the FIFO first */ | |
612 | if (offset < len) { | |
613 | seed = fm10k_crc_16b(data, seed, offset * 2); | |
614 | data = fifo->buffer; | |
615 | len -= offset; | |
616 | } | |
617 | ||
618 | /* process any remaining bits */ | |
619 | return fm10k_crc_16b(data, seed, len * 2); | |
620 | } | |
621 | ||
622 | /** | |
623 | * fm10k_mbx_update_local_crc - Update the local CRC for outgoing data | |
624 | * @mbx: pointer to mailbox | |
625 | * @head: head index provided by remote mailbox | |
626 | * | |
627 | * This function will generate the CRC for all data from the end of the | |
628 | * last head update to the current one. It uses the result of the | |
629 | * previous CRC as the seed for this update. The result is stored in | |
630 | * mbx->local. | |
631 | **/ | |
632 | static void fm10k_mbx_update_local_crc(struct fm10k_mbx_info *mbx, u16 head) | |
633 | { | |
634 | u16 len = mbx->tail_len - fm10k_mbx_index_len(mbx, head, mbx->tail); | |
635 | ||
636 | /* determine the offset for the start of the region to be pulled */ | |
637 | head = fm10k_fifo_head_offset(&mbx->tx, mbx->pulled); | |
638 | ||
639 | /* update local CRC to include all of the pulled data */ | |
640 | mbx->local = fm10k_fifo_crc(&mbx->tx, head, len, mbx->local); | |
641 | } | |
642 | ||
643 | /** | |
644 | * fm10k_mbx_verify_remote_crc - Verify the CRC is correct for current data | |
645 | * @mbx: pointer to mailbox | |
646 | * | |
647 | * This function will take all data that has been provided from the remote | |
648 | * end and generate a CRC for it. This is stored in mbx->remote. The | |
649 | * CRC for the header is then computed and if the result is non-zero this | |
650 | * is an error and we signal an error dropping all data and resetting the | |
651 | * connection. | |
652 | */ | |
653 | static s32 fm10k_mbx_verify_remote_crc(struct fm10k_mbx_info *mbx) | |
654 | { | |
655 | struct fm10k_mbx_fifo *fifo = &mbx->rx; | |
656 | u16 len = mbx->head_len; | |
657 | u16 offset = fm10k_fifo_tail_offset(fifo, mbx->pushed) - len; | |
658 | u16 crc; | |
659 | ||
660 | /* update the remote CRC if new data has been received */ | |
661 | if (len) | |
662 | mbx->remote = fm10k_fifo_crc(fifo, offset, len, mbx->remote); | |
663 | ||
664 | /* process the full header as we have to validate the CRC */ | |
665 | crc = fm10k_crc_16b(&mbx->mbx_hdr, mbx->remote, 1); | |
666 | ||
667 | /* notify other end if we have a problem */ | |
668 | return crc ? FM10K_MBX_ERR_CRC : 0; | |
669 | } | |
670 | ||
1337e6b9 AD |
671 | /** |
672 | * fm10k_mbx_rx_ready - Indicates that a message is ready in the Rx FIFO | |
673 | * @mbx: pointer to mailbox | |
674 | * | |
675 | * This function returns true if there is a message in the Rx FIFO to dequeue. | |
676 | **/ | |
677 | static bool fm10k_mbx_rx_ready(struct fm10k_mbx_info *mbx) | |
678 | { | |
679 | u16 msg_size = fm10k_fifo_head_len(&mbx->rx); | |
680 | ||
681 | return msg_size && (fm10k_fifo_used(&mbx->rx) >= msg_size); | |
682 | } | |
683 | ||
684 | /** | |
685 | * fm10k_mbx_tx_ready - Indicates that the mailbox is in state ready for Tx | |
686 | * @mbx: pointer to mailbox | |
687 | * @len: verify free space is >= this value | |
688 | * | |
689 | * This function returns true if the mailbox is in a state ready to transmit. | |
690 | **/ | |
691 | static bool fm10k_mbx_tx_ready(struct fm10k_mbx_info *mbx, u16 len) | |
692 | { | |
693 | u16 fifo_unused = fm10k_fifo_unused(&mbx->tx); | |
694 | ||
695 | return (mbx->state == FM10K_STATE_OPEN) && (fifo_unused >= len); | |
696 | } | |
697 | ||
698 | /** | |
699 | * fm10k_mbx_tx_complete - Indicates that the Tx FIFO has been emptied | |
700 | * @mbx: pointer to mailbox | |
701 | * | |
702 | * This function returns true if the Tx FIFO is empty. | |
703 | **/ | |
704 | static bool fm10k_mbx_tx_complete(struct fm10k_mbx_info *mbx) | |
705 | { | |
706 | return fm10k_fifo_empty(&mbx->tx); | |
707 | } | |
708 | ||
709 | /** | |
710 | * fm10k_mbx_deqeueue_rx - Dequeues the message from the head in the Rx FIFO | |
711 | * @hw: pointer to hardware structure | |
712 | * @mbx: pointer to mailbox | |
713 | * | |
714 | * This function dequeues messages and hands them off to the tlv parser. | |
715 | * It will return the number of messages processed when called. | |
716 | **/ | |
717 | static u16 fm10k_mbx_dequeue_rx(struct fm10k_hw *hw, | |
718 | struct fm10k_mbx_info *mbx) | |
719 | { | |
720 | struct fm10k_mbx_fifo *fifo = &mbx->rx; | |
721 | s32 err; | |
722 | u16 cnt; | |
723 | ||
724 | /* parse Rx messages out of the Rx FIFO to empty it */ | |
725 | for (cnt = 0; !fm10k_fifo_empty(fifo); cnt++) { | |
726 | err = fm10k_tlv_msg_parse(hw, fifo->buffer + fifo->head, | |
727 | mbx, mbx->msg_data); | |
728 | if (err < 0) | |
729 | mbx->rx_parse_err++; | |
730 | ||
731 | fm10k_fifo_head_drop(fifo); | |
732 | } | |
733 | ||
734 | /* shift remaining bytes back to start of FIFO */ | |
735 | memmove(fifo->buffer, fifo->buffer + fifo->tail, mbx->pushed << 2); | |
736 | ||
737 | /* shift head and tail based on the memory we moved */ | |
738 | fifo->tail -= fifo->head; | |
739 | fifo->head = 0; | |
740 | ||
741 | return cnt; | |
742 | } | |
743 | ||
744 | /** | |
745 | * fm10k_mbx_enqueue_tx - Enqueues the message to the tail of the Tx FIFO | |
746 | * @hw: pointer to hardware structure | |
747 | * @mbx: pointer to mailbox | |
748 | * @msg: message array to read | |
749 | * | |
750 | * This function enqueues a message up to the size specified by the length | |
751 | * contained in the first DWORD of the message and will place at the tail | |
752 | * of the FIFO. It will return 0 on success, or a negative value on error. | |
753 | **/ | |
754 | static s32 fm10k_mbx_enqueue_tx(struct fm10k_hw *hw, | |
755 | struct fm10k_mbx_info *mbx, const u32 *msg) | |
756 | { | |
757 | u32 countdown = mbx->timeout; | |
758 | s32 err; | |
759 | ||
760 | switch (mbx->state) { | |
761 | case FM10K_STATE_CLOSED: | |
762 | case FM10K_STATE_DISCONNECT: | |
763 | return FM10K_MBX_ERR_NO_MBX; | |
764 | default: | |
765 | break; | |
766 | } | |
767 | ||
768 | /* enqueue the message on the Tx FIFO */ | |
769 | err = fm10k_fifo_enqueue(&mbx->tx, msg); | |
770 | ||
771 | /* if it failed give the FIFO a chance to drain */ | |
772 | while (err && countdown) { | |
773 | countdown--; | |
774 | udelay(mbx->udelay); | |
775 | mbx->ops.process(hw, mbx); | |
776 | err = fm10k_fifo_enqueue(&mbx->tx, msg); | |
777 | } | |
778 | ||
eca32047 | 779 | /* if we failed treat the error */ |
1337e6b9 AD |
780 | if (err) { |
781 | mbx->timeout = 0; | |
782 | mbx->tx_busy++; | |
783 | } | |
784 | ||
785 | /* begin processing message, ignore errors as this is just meant | |
786 | * to start the mailbox flow so we are not concerned if there | |
787 | * is a bad error, or the mailbox is already busy with a request | |
788 | */ | |
789 | if (!mbx->tail_len) | |
790 | mbx->ops.process(hw, mbx); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | /** | |
796 | * fm10k_mbx_read - Copies the mbmem to local message buffer | |
797 | * @hw: pointer to hardware structure | |
798 | * @mbx: pointer to mailbox | |
799 | * | |
800 | * This function copies the message from the mbmem to the message array | |
801 | **/ | |
802 | static s32 fm10k_mbx_read(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) | |
803 | { | |
804 | /* only allow one reader in here at a time */ | |
805 | if (mbx->mbx_hdr) | |
806 | return FM10K_MBX_ERR_BUSY; | |
807 | ||
808 | /* read to capture initial interrupt bits */ | |
809 | if (fm10k_read_reg(hw, mbx->mbx_reg) & FM10K_MBX_REQ_INTERRUPT) | |
810 | mbx->mbx_lock = FM10K_MBX_ACK; | |
811 | ||
812 | /* write back interrupt bits to clear */ | |
813 | fm10k_write_reg(hw, mbx->mbx_reg, | |
814 | FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT); | |
815 | ||
816 | /* read remote header */ | |
817 | mbx->mbx_hdr = fm10k_read_reg(hw, mbx->mbmem_reg ^ mbx->mbmem_len); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | /** | |
823 | * fm10k_mbx_write - Copies the local message buffer to mbmem | |
824 | * @hw: pointer to hardware structure | |
825 | * @mbx: pointer to mailbox | |
826 | * | |
827 | * This function copies the message from the the message array to mbmem | |
828 | **/ | |
829 | static void fm10k_mbx_write(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) | |
830 | { | |
831 | u32 mbmem = mbx->mbmem_reg; | |
832 | ||
eca32047 | 833 | /* write new msg header to notify recipient of change */ |
1337e6b9 AD |
834 | fm10k_write_reg(hw, mbmem, mbx->mbx_hdr); |
835 | ||
a4bcea83 | 836 | /* write mailbox to send interrupt */ |
1337e6b9 AD |
837 | if (mbx->mbx_lock) |
838 | fm10k_write_reg(hw, mbx->mbx_reg, mbx->mbx_lock); | |
839 | ||
840 | /* we no longer are using the header so free it */ | |
841 | mbx->mbx_hdr = 0; | |
842 | mbx->mbx_lock = 0; | |
843 | } | |
844 | ||
b651957c AD |
845 | /** |
846 | * fm10k_mbx_create_connect_hdr - Generate a connect mailbox header | |
847 | * @mbx: pointer to mailbox | |
848 | * | |
849 | * This function returns a connection mailbox header | |
850 | **/ | |
851 | static void fm10k_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx) | |
852 | { | |
853 | mbx->mbx_lock |= FM10K_MBX_REQ; | |
854 | ||
855 | mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_CONNECT, TYPE) | | |
856 | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD) | | |
857 | FM10K_MSG_HDR_FIELD_SET(mbx->rx.size - 1, CONNECT_SIZE); | |
858 | } | |
859 | ||
860 | /** | |
861 | * fm10k_mbx_create_data_hdr - Generate a data mailbox header | |
862 | * @mbx: pointer to mailbox | |
863 | * | |
864 | * This function returns a data mailbox header | |
865 | **/ | |
866 | static void fm10k_mbx_create_data_hdr(struct fm10k_mbx_info *mbx) | |
867 | { | |
868 | u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DATA, TYPE) | | |
869 | FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) | | |
870 | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); | |
871 | struct fm10k_mbx_fifo *fifo = &mbx->tx; | |
872 | u16 crc; | |
873 | ||
874 | if (mbx->tail_len) | |
875 | mbx->mbx_lock |= FM10K_MBX_REQ; | |
876 | ||
877 | /* generate CRC for data in flight and header */ | |
878 | crc = fm10k_fifo_crc(fifo, fm10k_fifo_head_offset(fifo, mbx->pulled), | |
879 | mbx->tail_len, mbx->local); | |
880 | crc = fm10k_crc_16b(&hdr, crc, 1); | |
881 | ||
882 | /* load header to memory to be written */ | |
883 | mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC); | |
884 | } | |
885 | ||
886 | /** | |
887 | * fm10k_mbx_create_disconnect_hdr - Generate a disconnect mailbox header | |
888 | * @mbx: pointer to mailbox | |
889 | * | |
890 | * This function returns a disconnect mailbox header | |
891 | **/ | |
892 | static void fm10k_mbx_create_disconnect_hdr(struct fm10k_mbx_info *mbx) | |
893 | { | |
894 | u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DISCONNECT, TYPE) | | |
895 | FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) | | |
896 | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); | |
897 | u16 crc = fm10k_crc_16b(&hdr, mbx->local, 1); | |
898 | ||
899 | mbx->mbx_lock |= FM10K_MBX_ACK; | |
900 | ||
901 | /* load header to memory to be written */ | |
902 | mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC); | |
903 | } | |
904 | ||
afadfd22 | 905 | /** |
3d02b3df | 906 | * fm10k_mbx_create_fake_disconnect_hdr - Generate a false disconnect mbox hdr |
afadfd22 JK |
907 | * @mbx: pointer to mailbox |
908 | * | |
909 | * This function creates a fake disconnect header for loading into remote | |
910 | * mailbox header. The primary purpose is to prevent errors on immediate | |
911 | * start up after mbx->connect. | |
912 | **/ | |
913 | static void fm10k_mbx_create_fake_disconnect_hdr(struct fm10k_mbx_info *mbx) | |
914 | { | |
915 | u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DISCONNECT, TYPE) | | |
916 | FM10K_MSG_HDR_FIELD_SET(mbx->head, TAIL) | | |
917 | FM10K_MSG_HDR_FIELD_SET(mbx->tail, HEAD); | |
918 | u16 crc = fm10k_crc_16b(&hdr, mbx->local, 1); | |
919 | ||
920 | mbx->mbx_lock |= FM10K_MBX_ACK; | |
921 | ||
922 | /* load header to memory to be written */ | |
923 | mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC); | |
924 | } | |
925 | ||
b651957c AD |
926 | /** |
927 | * fm10k_mbx_create_error_msg - Generate a error message | |
928 | * @mbx: pointer to mailbox | |
929 | * @err: local error encountered | |
930 | * | |
931 | * This function will interpret the error provided by err, and based on | |
932 | * that it may shift the message by 1 DWORD and then place an error header | |
933 | * at the start of the message. | |
934 | **/ | |
935 | static void fm10k_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err) | |
936 | { | |
937 | /* only generate an error message for these types */ | |
938 | switch (err) { | |
939 | case FM10K_MBX_ERR_TAIL: | |
940 | case FM10K_MBX_ERR_HEAD: | |
941 | case FM10K_MBX_ERR_TYPE: | |
942 | case FM10K_MBX_ERR_SIZE: | |
943 | case FM10K_MBX_ERR_RSVD0: | |
944 | case FM10K_MBX_ERR_CRC: | |
945 | break; | |
946 | default: | |
947 | return; | |
948 | } | |
949 | ||
950 | mbx->mbx_lock |= FM10K_MBX_REQ; | |
951 | ||
952 | mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_ERROR, TYPE) | | |
953 | FM10K_MSG_HDR_FIELD_SET(err, ERR_NO) | | |
954 | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); | |
955 | } | |
956 | ||
957 | /** | |
958 | * fm10k_mbx_validate_msg_hdr - Validate common fields in the message header | |
959 | * @mbx: pointer to mailbox | |
960 | * @msg: message array to read | |
961 | * | |
962 | * This function will parse up the fields in the mailbox header and return | |
963 | * an error if the header contains any of a number of invalid configurations | |
964 | * including unrecognized type, invalid route, or a malformed message. | |
965 | **/ | |
966 | static s32 fm10k_mbx_validate_msg_hdr(struct fm10k_mbx_info *mbx) | |
967 | { | |
968 | u16 type, rsvd0, head, tail, size; | |
969 | const u32 *hdr = &mbx->mbx_hdr; | |
970 | ||
971 | type = FM10K_MSG_HDR_FIELD_GET(*hdr, TYPE); | |
972 | rsvd0 = FM10K_MSG_HDR_FIELD_GET(*hdr, RSVD0); | |
973 | tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL); | |
974 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); | |
975 | size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE); | |
976 | ||
977 | if (rsvd0) | |
978 | return FM10K_MBX_ERR_RSVD0; | |
979 | ||
980 | switch (type) { | |
981 | case FM10K_MSG_DISCONNECT: | |
982 | /* validate that all data has been received */ | |
983 | if (tail != mbx->head) | |
984 | return FM10K_MBX_ERR_TAIL; | |
985 | ||
986 | /* fall through */ | |
987 | case FM10K_MSG_DATA: | |
988 | /* validate that head is moving correctly */ | |
989 | if (!head || (head == FM10K_MSG_HDR_MASK(HEAD))) | |
990 | return FM10K_MBX_ERR_HEAD; | |
991 | if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len) | |
992 | return FM10K_MBX_ERR_HEAD; | |
993 | ||
994 | /* validate that tail is moving correctly */ | |
995 | if (!tail || (tail == FM10K_MSG_HDR_MASK(TAIL))) | |
996 | return FM10K_MBX_ERR_TAIL; | |
997 | if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len) | |
998 | break; | |
999 | ||
1000 | return FM10K_MBX_ERR_TAIL; | |
1001 | case FM10K_MSG_CONNECT: | |
1002 | /* validate size is in range and is power of 2 mask */ | |
1003 | if ((size < FM10K_VFMBX_MSG_MTU) || (size & (size + 1))) | |
1004 | return FM10K_MBX_ERR_SIZE; | |
1005 | ||
1006 | /* fall through */ | |
1007 | case FM10K_MSG_ERROR: | |
1008 | if (!head || (head == FM10K_MSG_HDR_MASK(HEAD))) | |
1009 | return FM10K_MBX_ERR_HEAD; | |
1010 | /* neither create nor error include a tail offset */ | |
1011 | if (tail) | |
1012 | return FM10K_MBX_ERR_TAIL; | |
1013 | ||
1014 | break; | |
1015 | default: | |
1016 | return FM10K_MBX_ERR_TYPE; | |
1017 | } | |
1018 | ||
1019 | return 0; | |
1020 | } | |
1021 | ||
1022 | /** | |
1023 | * fm10k_mbx_create_reply - Generate reply based on state and remote head | |
1024 | * @mbx: pointer to mailbox | |
1025 | * @head: acknowledgement number | |
1026 | * | |
1027 | * This function will generate an outgoing message based on the current | |
1028 | * mailbox state and the remote fifo head. It will return the length | |
1029 | * of the outgoing message excluding header on success, and a negative value | |
1030 | * on error. | |
1031 | **/ | |
1032 | static s32 fm10k_mbx_create_reply(struct fm10k_hw *hw, | |
1033 | struct fm10k_mbx_info *mbx, u16 head) | |
1034 | { | |
1035 | switch (mbx->state) { | |
1036 | case FM10K_STATE_OPEN: | |
1037 | case FM10K_STATE_DISCONNECT: | |
1038 | /* update our checksum for the outgoing data */ | |
1039 | fm10k_mbx_update_local_crc(mbx, head); | |
1040 | ||
1041 | /* as long as other end recognizes us keep sending data */ | |
1042 | fm10k_mbx_pull_head(hw, mbx, head); | |
1043 | ||
1044 | /* generate new header based on data */ | |
1045 | if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) | |
1046 | fm10k_mbx_create_data_hdr(mbx); | |
1047 | else | |
1048 | fm10k_mbx_create_disconnect_hdr(mbx); | |
1049 | break; | |
1050 | case FM10K_STATE_CONNECT: | |
1051 | /* send disconnect even if we aren't connected */ | |
1052 | fm10k_mbx_create_connect_hdr(mbx); | |
1053 | break; | |
1054 | case FM10K_STATE_CLOSED: | |
1055 | /* generate new header based on data */ | |
1056 | fm10k_mbx_create_disconnect_hdr(mbx); | |
1057 | default: | |
1058 | break; | |
1059 | } | |
1060 | ||
1061 | return 0; | |
1062 | } | |
1063 | ||
1337e6b9 AD |
1064 | /** |
1065 | * fm10k_mbx_reset_work- Reset internal pointers for any pending work | |
1066 | * @mbx: pointer to mailbox | |
1067 | * | |
1068 | * This function will reset all internal pointers so any work in progress | |
1069 | * is dropped. This call should occur every time we transition from the | |
1070 | * open state to the connect state. | |
1071 | **/ | |
1072 | static void fm10k_mbx_reset_work(struct fm10k_mbx_info *mbx) | |
1073 | { | |
4b09728e JK |
1074 | u16 len, head, ack; |
1075 | ||
1337e6b9 AD |
1076 | /* reset our outgoing max size back to Rx limits */ |
1077 | mbx->max_size = mbx->rx.size - 1; | |
1078 | ||
4b09728e JK |
1079 | /* update mbx->pulled to account for tail_len and ack */ |
1080 | head = FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, HEAD); | |
1081 | ack = fm10k_mbx_index_len(mbx, head, mbx->tail); | |
1082 | mbx->pulled += mbx->tail_len - ack; | |
1083 | ||
1084 | /* now drop any messages which have started or finished transmitting */ | |
1085 | while (fm10k_fifo_head_len(&mbx->tx) && mbx->pulled) { | |
1086 | len = fm10k_fifo_head_drop(&mbx->tx); | |
1087 | mbx->tx_dropped++; | |
1088 | if (mbx->pulled >= len) | |
1089 | mbx->pulled -= len; | |
1090 | else | |
1091 | mbx->pulled = 0; | |
1092 | } | |
1093 | ||
1337e6b9 AD |
1094 | /* just do a quick resysnc to start of message */ |
1095 | mbx->pushed = 0; | |
1096 | mbx->pulled = 0; | |
1097 | mbx->tail_len = 0; | |
1098 | mbx->head_len = 0; | |
1099 | mbx->rx.tail = 0; | |
1100 | mbx->rx.head = 0; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * fm10k_mbx_update_max_size - Update the max_size and drop any large messages | |
1105 | * @mbx: pointer to mailbox | |
1106 | * @size: new value for max_size | |
1107 | * | |
da61b367 JK |
1108 | * This function updates the max_size value and drops any outgoing messages |
1109 | * at the head of the Tx FIFO if they are larger than max_size. It does not | |
1110 | * drop all messages, as this is too difficult to parse and remove them from | |
1111 | * the FIFO. Instead, rely on the checking to ensure that messages larger | |
1112 | * than max_size aren't pushed into the memory buffer. | |
1337e6b9 AD |
1113 | **/ |
1114 | static void fm10k_mbx_update_max_size(struct fm10k_mbx_info *mbx, u16 size) | |
1115 | { | |
1116 | u16 len; | |
1117 | ||
1118 | mbx->max_size = size; | |
1119 | ||
1120 | /* flush any oversized messages from the queue */ | |
1121 | for (len = fm10k_fifo_head_len(&mbx->tx); | |
1122 | len > size; | |
1123 | len = fm10k_fifo_head_len(&mbx->tx)) { | |
1124 | fm10k_fifo_head_drop(&mbx->tx); | |
1125 | mbx->tx_dropped++; | |
1126 | } | |
1127 | } | |
1128 | ||
b651957c AD |
1129 | /** |
1130 | * fm10k_mbx_connect_reset - Reset following request for reset | |
1131 | * @mbx: pointer to mailbox | |
1132 | * | |
1133 | * This function resets the mailbox to either a disconnected state | |
1134 | * or a connect state depending on the current mailbox state | |
1135 | **/ | |
1136 | static void fm10k_mbx_connect_reset(struct fm10k_mbx_info *mbx) | |
1137 | { | |
1138 | /* just do a quick resysnc to start of frame */ | |
1139 | fm10k_mbx_reset_work(mbx); | |
1140 | ||
1141 | /* reset CRC seeds */ | |
1142 | mbx->local = FM10K_MBX_CRC_SEED; | |
1143 | mbx->remote = FM10K_MBX_CRC_SEED; | |
1144 | ||
1145 | /* we cannot exit connect until the size is good */ | |
1146 | if (mbx->state == FM10K_STATE_OPEN) | |
1147 | mbx->state = FM10K_STATE_CONNECT; | |
1148 | else | |
1149 | mbx->state = FM10K_STATE_CLOSED; | |
1150 | } | |
1151 | ||
1152 | /** | |
1153 | * fm10k_mbx_process_connect - Process connect header | |
1154 | * @mbx: pointer to mailbox | |
1155 | * @msg: message array to process | |
1156 | * | |
1157 | * This function will read an incoming connect header and reply with the | |
1158 | * appropriate message. It will return a value indicating the number of | |
1159 | * data DWORDs on success, or will return a negative value on failure. | |
1160 | **/ | |
1161 | static s32 fm10k_mbx_process_connect(struct fm10k_hw *hw, | |
1162 | struct fm10k_mbx_info *mbx) | |
1163 | { | |
1164 | const enum fm10k_mbx_state state = mbx->state; | |
1165 | const u32 *hdr = &mbx->mbx_hdr; | |
1166 | u16 size, head; | |
1167 | ||
1168 | /* we will need to pull all of the fields for verification */ | |
1169 | size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE); | |
1170 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); | |
1171 | ||
1172 | switch (state) { | |
1173 | case FM10K_STATE_DISCONNECT: | |
1174 | case FM10K_STATE_OPEN: | |
1175 | /* reset any in-progress work */ | |
1176 | fm10k_mbx_connect_reset(mbx); | |
1177 | break; | |
1178 | case FM10K_STATE_CONNECT: | |
1179 | /* we cannot exit connect until the size is good */ | |
1180 | if (size > mbx->rx.size) { | |
1181 | mbx->max_size = mbx->rx.size - 1; | |
1182 | } else { | |
1183 | /* record the remote system requesting connection */ | |
1184 | mbx->state = FM10K_STATE_OPEN; | |
1185 | ||
1186 | fm10k_mbx_update_max_size(mbx, size); | |
1187 | } | |
1188 | break; | |
1189 | default: | |
1190 | break; | |
1191 | } | |
1192 | ||
1193 | /* align our tail index to remote head index */ | |
1194 | mbx->tail = head; | |
1195 | ||
1196 | return fm10k_mbx_create_reply(hw, mbx, head); | |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * fm10k_mbx_process_data - Process data header | |
1201 | * @mbx: pointer to mailbox | |
1202 | * | |
1203 | * This function will read an incoming data header and reply with the | |
1204 | * appropriate message. It will return a value indicating the number of | |
1205 | * data DWORDs on success, or will return a negative value on failure. | |
1206 | **/ | |
1207 | static s32 fm10k_mbx_process_data(struct fm10k_hw *hw, | |
1208 | struct fm10k_mbx_info *mbx) | |
1209 | { | |
1210 | const u32 *hdr = &mbx->mbx_hdr; | |
1211 | u16 head, tail; | |
1212 | s32 err; | |
1213 | ||
1214 | /* we will need to pull all of the fields for verification */ | |
1215 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); | |
1216 | tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL); | |
1217 | ||
1218 | /* if we are in connect just update our data and go */ | |
1219 | if (mbx->state == FM10K_STATE_CONNECT) { | |
1220 | mbx->tail = head; | |
1221 | mbx->state = FM10K_STATE_OPEN; | |
1222 | } | |
1223 | ||
1224 | /* abort on message size errors */ | |
1225 | err = fm10k_mbx_push_tail(hw, mbx, tail); | |
1226 | if (err < 0) | |
1227 | return err; | |
1228 | ||
1229 | /* verify the checksum on the incoming data */ | |
1230 | err = fm10k_mbx_verify_remote_crc(mbx); | |
1231 | if (err) | |
1232 | return err; | |
1233 | ||
1234 | /* process messages if we have received any */ | |
1235 | fm10k_mbx_dequeue_rx(hw, mbx); | |
1236 | ||
1237 | return fm10k_mbx_create_reply(hw, mbx, head); | |
1238 | } | |
1239 | ||
1240 | /** | |
1241 | * fm10k_mbx_process_disconnect - Process disconnect header | |
1242 | * @mbx: pointer to mailbox | |
1243 | * | |
1244 | * This function will read an incoming disconnect header and reply with the | |
1245 | * appropriate message. It will return a value indicating the number of | |
1246 | * data DWORDs on success, or will return a negative value on failure. | |
1247 | **/ | |
1248 | static s32 fm10k_mbx_process_disconnect(struct fm10k_hw *hw, | |
1249 | struct fm10k_mbx_info *mbx) | |
1250 | { | |
1251 | const enum fm10k_mbx_state state = mbx->state; | |
1252 | const u32 *hdr = &mbx->mbx_hdr; | |
f4a80f1e | 1253 | u16 head; |
b651957c AD |
1254 | s32 err; |
1255 | ||
f4a80f1e | 1256 | /* we will need to pull the header field for verification */ |
b651957c | 1257 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); |
b651957c AD |
1258 | |
1259 | /* We should not be receiving disconnect if Rx is incomplete */ | |
1260 | if (mbx->pushed) | |
1261 | return FM10K_MBX_ERR_TAIL; | |
1262 | ||
1263 | /* we have already verified mbx->head == tail so we know this is 0 */ | |
1264 | mbx->head_len = 0; | |
1265 | ||
1266 | /* verify the checksum on the incoming header is correct */ | |
1267 | err = fm10k_mbx_verify_remote_crc(mbx); | |
1268 | if (err) | |
1269 | return err; | |
1270 | ||
1271 | switch (state) { | |
1272 | case FM10K_STATE_DISCONNECT: | |
1273 | case FM10K_STATE_OPEN: | |
1274 | /* state doesn't change if we still have work to do */ | |
1275 | if (!fm10k_mbx_tx_complete(mbx)) | |
1276 | break; | |
1277 | ||
1278 | /* verify the head indicates we completed all transmits */ | |
1279 | if (head != mbx->tail) | |
1280 | return FM10K_MBX_ERR_HEAD; | |
1281 | ||
1282 | /* reset any in-progress work */ | |
1283 | fm10k_mbx_connect_reset(mbx); | |
1284 | break; | |
1285 | default: | |
1286 | break; | |
1287 | } | |
1288 | ||
1289 | return fm10k_mbx_create_reply(hw, mbx, head); | |
1290 | } | |
1291 | ||
1292 | /** | |
1293 | * fm10k_mbx_process_error - Process error header | |
1294 | * @mbx: pointer to mailbox | |
1295 | * | |
1296 | * This function will read an incoming error header and reply with the | |
1297 | * appropriate message. It will return a value indicating the number of | |
1298 | * data DWORDs on success, or will return a negative value on failure. | |
1299 | **/ | |
1300 | static s32 fm10k_mbx_process_error(struct fm10k_hw *hw, | |
1301 | struct fm10k_mbx_info *mbx) | |
1302 | { | |
1303 | const u32 *hdr = &mbx->mbx_hdr; | |
b651957c AD |
1304 | u16 head; |
1305 | ||
1306 | /* we will need to pull all of the fields for verification */ | |
1307 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); | |
1308 | ||
b651957c AD |
1309 | switch (mbx->state) { |
1310 | case FM10K_STATE_OPEN: | |
1311 | case FM10K_STATE_DISCONNECT: | |
1312 | /* flush any uncompleted work */ | |
1313 | fm10k_mbx_reset_work(mbx); | |
1314 | ||
1315 | /* reset CRC seeds */ | |
1316 | mbx->local = FM10K_MBX_CRC_SEED; | |
1317 | mbx->remote = FM10K_MBX_CRC_SEED; | |
1318 | ||
1319 | /* reset tail index and size to prepare for reconnect */ | |
1320 | mbx->tail = head; | |
1321 | ||
1322 | /* if open then reset max_size and go back to connect */ | |
1323 | if (mbx->state == FM10K_STATE_OPEN) { | |
1324 | mbx->state = FM10K_STATE_CONNECT; | |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | /* send a connect message to get data flowing again */ | |
1329 | fm10k_mbx_create_connect_hdr(mbx); | |
1330 | return 0; | |
1331 | default: | |
1332 | break; | |
1333 | } | |
1334 | ||
1335 | return fm10k_mbx_create_reply(hw, mbx, mbx->tail); | |
1336 | } | |
1337 | ||
1338 | /** | |
1339 | * fm10k_mbx_process - Process mailbox interrupt | |
1340 | * @hw: pointer to hardware structure | |
1341 | * @mbx: pointer to mailbox | |
1342 | * | |
1343 | * This function will process incoming mailbox events and generate mailbox | |
1344 | * replies. It will return a value indicating the number of DWORDs | |
1345 | * transmitted excluding header on success or a negative value on error. | |
1346 | **/ | |
1347 | static s32 fm10k_mbx_process(struct fm10k_hw *hw, | |
1348 | struct fm10k_mbx_info *mbx) | |
1349 | { | |
1350 | s32 err; | |
1351 | ||
1352 | /* we do not read mailbox if closed */ | |
1353 | if (mbx->state == FM10K_STATE_CLOSED) | |
1354 | return 0; | |
1355 | ||
1356 | /* copy data from mailbox */ | |
1357 | err = fm10k_mbx_read(hw, mbx); | |
1358 | if (err) | |
1359 | return err; | |
1360 | ||
1361 | /* validate type, source, and destination */ | |
1362 | err = fm10k_mbx_validate_msg_hdr(mbx); | |
1363 | if (err < 0) | |
1364 | goto msg_err; | |
1365 | ||
1366 | switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, TYPE)) { | |
1367 | case FM10K_MSG_CONNECT: | |
1368 | err = fm10k_mbx_process_connect(hw, mbx); | |
1369 | break; | |
1370 | case FM10K_MSG_DATA: | |
1371 | err = fm10k_mbx_process_data(hw, mbx); | |
1372 | break; | |
1373 | case FM10K_MSG_DISCONNECT: | |
1374 | err = fm10k_mbx_process_disconnect(hw, mbx); | |
1375 | break; | |
1376 | case FM10K_MSG_ERROR: | |
1377 | err = fm10k_mbx_process_error(hw, mbx); | |
1378 | break; | |
1379 | default: | |
1380 | err = FM10K_MBX_ERR_TYPE; | |
1381 | break; | |
1382 | } | |
1383 | ||
1384 | msg_err: | |
1385 | /* notify partner of errors on our end */ | |
1386 | if (err < 0) | |
1387 | fm10k_mbx_create_error_msg(mbx, err); | |
1388 | ||
1389 | /* copy data from mailbox */ | |
1390 | fm10k_mbx_write(hw, mbx); | |
1391 | ||
1392 | return err; | |
1393 | } | |
1394 | ||
1395 | /** | |
1396 | * fm10k_mbx_disconnect - Shutdown mailbox connection | |
1397 | * @hw: pointer to hardware structure | |
1398 | * @mbx: pointer to mailbox | |
1399 | * | |
1400 | * This function will shut down the mailbox. It places the mailbox first | |
1401 | * in the disconnect state, it then allows up to a predefined timeout for | |
1402 | * the mailbox to transition to close on its own. If this does not occur | |
1403 | * then the mailbox will be forced into the closed state. | |
1404 | * | |
1405 | * Any mailbox transactions not completed before calling this function | |
1406 | * are not guaranteed to complete and may be dropped. | |
1407 | **/ | |
1408 | static void fm10k_mbx_disconnect(struct fm10k_hw *hw, | |
1409 | struct fm10k_mbx_info *mbx) | |
1410 | { | |
1411 | int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0; | |
1412 | ||
1413 | /* Place mbx in ready to disconnect state */ | |
1414 | mbx->state = FM10K_STATE_DISCONNECT; | |
1415 | ||
1416 | /* trigger interrupt to start shutdown process */ | |
1417 | fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ | | |
1418 | FM10K_MBX_INTERRUPT_DISABLE); | |
1419 | do { | |
1420 | udelay(FM10K_MBX_POLL_DELAY); | |
1421 | mbx->ops.process(hw, mbx); | |
1422 | timeout -= FM10K_MBX_POLL_DELAY; | |
1423 | } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED)); | |
1424 | ||
78288e37 JK |
1425 | /* in case we didn't close, just force the mailbox into shutdown and |
1426 | * drop all left over messages in the FIFO. | |
1427 | */ | |
b651957c | 1428 | fm10k_mbx_connect_reset(mbx); |
78288e37 | 1429 | fm10k_fifo_drop_all(&mbx->tx); |
b651957c AD |
1430 | |
1431 | fm10k_write_reg(hw, mbx->mbmem_reg, 0); | |
1432 | } | |
1433 | ||
1434 | /** | |
1435 | * fm10k_mbx_connect - Start mailbox connection | |
1436 | * @hw: pointer to hardware structure | |
1437 | * @mbx: pointer to mailbox | |
1438 | * | |
1439 | * This function will initiate a mailbox connection. It will populate the | |
1440 | * mailbox with a broadcast connect message and then initialize the lock. | |
1441 | * This is safe since the connect message is a single DWORD so the mailbox | |
1442 | * transaction is guaranteed to be atomic. | |
1443 | * | |
1444 | * This function will return an error if the mailbox has not been initiated | |
1445 | * or is currently in use. | |
1446 | **/ | |
1447 | static s32 fm10k_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) | |
1448 | { | |
1449 | /* we cannot connect an uninitialized mailbox */ | |
1450 | if (!mbx->rx.buffer) | |
1451 | return FM10K_MBX_ERR_NO_SPACE; | |
1452 | ||
1453 | /* we cannot connect an already connected mailbox */ | |
1454 | if (mbx->state != FM10K_STATE_CLOSED) | |
1455 | return FM10K_MBX_ERR_BUSY; | |
1456 | ||
1457 | /* mailbox timeout can now become active */ | |
1458 | mbx->timeout = FM10K_MBX_INIT_TIMEOUT; | |
1459 | ||
1460 | /* Place mbx in ready to connect state */ | |
1461 | mbx->state = FM10K_STATE_CONNECT; | |
1462 | ||
afadfd22 JK |
1463 | fm10k_mbx_reset_work(mbx); |
1464 | ||
b651957c | 1465 | /* initialize header of remote mailbox */ |
afadfd22 | 1466 | fm10k_mbx_create_fake_disconnect_hdr(mbx); |
b651957c AD |
1467 | fm10k_write_reg(hw, mbx->mbmem_reg ^ mbx->mbmem_len, mbx->mbx_hdr); |
1468 | ||
1469 | /* enable interrupt and notify other party of new message */ | |
1470 | mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT | | |
1471 | FM10K_MBX_INTERRUPT_ENABLE; | |
1472 | ||
1473 | /* generate and load connect header into mailbox */ | |
1474 | fm10k_mbx_create_connect_hdr(mbx); | |
1475 | fm10k_mbx_write(hw, mbx); | |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
1337e6b9 AD |
1480 | /** |
1481 | * fm10k_mbx_validate_handlers - Validate layout of message parsing data | |
1482 | * @msg_data: handlers for mailbox events | |
1483 | * | |
1484 | * This function validates the layout of the message parsing data. This | |
1485 | * should be mostly static, but it is important to catch any errors that | |
1486 | * are made when constructing the parsers. | |
1487 | **/ | |
1488 | static s32 fm10k_mbx_validate_handlers(const struct fm10k_msg_data *msg_data) | |
1489 | { | |
1490 | const struct fm10k_tlv_attr *attr; | |
1491 | unsigned int id; | |
1492 | ||
1493 | /* Allow NULL mailboxes that transmit but don't receive */ | |
1494 | if (!msg_data) | |
1495 | return 0; | |
1496 | ||
1497 | while (msg_data->id != FM10K_TLV_ERROR) { | |
1498 | /* all messages should have a function handler */ | |
1499 | if (!msg_data->func) | |
1500 | return FM10K_ERR_PARAM; | |
1501 | ||
1502 | /* parser is optional */ | |
1503 | attr = msg_data->attr; | |
1504 | if (attr) { | |
1505 | while (attr->id != FM10K_TLV_ERROR) { | |
1506 | id = attr->id; | |
1507 | attr++; | |
1508 | /* ID should always be increasing */ | |
1509 | if (id >= attr->id) | |
1510 | return FM10K_ERR_PARAM; | |
1511 | /* ID should fit in results array */ | |
1512 | if (id >= FM10K_TLV_RESULTS_MAX) | |
1513 | return FM10K_ERR_PARAM; | |
1514 | } | |
1515 | ||
1516 | /* verify terminator is in the list */ | |
1517 | if (attr->id != FM10K_TLV_ERROR) | |
1518 | return FM10K_ERR_PARAM; | |
1519 | } | |
1520 | ||
1521 | id = msg_data->id; | |
1522 | msg_data++; | |
1523 | /* ID should always be increasing */ | |
1524 | if (id >= msg_data->id) | |
1525 | return FM10K_ERR_PARAM; | |
1526 | } | |
1527 | ||
1528 | /* verify terminator is in the list */ | |
1529 | if ((msg_data->id != FM10K_TLV_ERROR) || !msg_data->func) | |
1530 | return FM10K_ERR_PARAM; | |
1531 | ||
1532 | return 0; | |
1533 | } | |
1534 | ||
1535 | /** | |
1536 | * fm10k_mbx_register_handlers - Register a set of handler ops for mailbox | |
1537 | * @mbx: pointer to mailbox | |
1538 | * @msg_data: handlers for mailbox events | |
1539 | * | |
1540 | * This function associates a set of message handling ops with a mailbox. | |
1541 | **/ | |
1542 | static s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx, | |
1543 | const struct fm10k_msg_data *msg_data) | |
1544 | { | |
1545 | /* validate layout of handlers before assigning them */ | |
1546 | if (fm10k_mbx_validate_handlers(msg_data)) | |
1547 | return FM10K_ERR_PARAM; | |
1548 | ||
1549 | /* initialize the message handlers */ | |
1550 | mbx->msg_data = msg_data; | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
b651957c AD |
1555 | /** |
1556 | * fm10k_pfvf_mbx_init - Initialize mailbox memory for PF/VF mailbox | |
1557 | * @hw: pointer to hardware structure | |
1558 | * @mbx: pointer to mailbox | |
1559 | * @msg_data: handlers for mailbox events | |
1560 | * @id: ID reference for PF as it supports up to 64 PF/VF mailboxes | |
1561 | * | |
1562 | * This function initializes the mailbox for use. It will split the | |
1563 | * buffer provided an use that th populate both the Tx and Rx FIFO by | |
1564 | * evenly splitting it. In order to allow for easy masking of head/tail | |
1565 | * the value reported in size must be a power of 2 and is reported in | |
1566 | * DWORDs, not bytes. Any invalid values will cause the mailbox to return | |
1567 | * error. | |
1568 | **/ | |
1569 | s32 fm10k_pfvf_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, | |
1570 | const struct fm10k_msg_data *msg_data, u8 id) | |
1571 | { | |
1572 | /* initialize registers */ | |
1573 | switch (hw->mac.type) { | |
5cb8db4a AD |
1574 | case fm10k_mac_vf: |
1575 | mbx->mbx_reg = FM10K_VFMBX; | |
1576 | mbx->mbmem_reg = FM10K_VFMBMEM(FM10K_VFMBMEM_VF_XOR); | |
1577 | break; | |
b651957c AD |
1578 | case fm10k_mac_pf: |
1579 | /* there are only 64 VF <-> PF mailboxes */ | |
1580 | if (id < 64) { | |
1581 | mbx->mbx_reg = FM10K_MBX(id); | |
1582 | mbx->mbmem_reg = FM10K_MBMEM_VF(id, 0); | |
1583 | break; | |
1584 | } | |
1585 | /* fallthough */ | |
1586 | default: | |
1587 | return FM10K_MBX_ERR_NO_MBX; | |
1588 | } | |
1589 | ||
1590 | /* start out in closed state */ | |
1591 | mbx->state = FM10K_STATE_CLOSED; | |
1592 | ||
1593 | /* validate layout of handlers before assigning them */ | |
1594 | if (fm10k_mbx_validate_handlers(msg_data)) | |
1595 | return FM10K_ERR_PARAM; | |
1596 | ||
1597 | /* initialize the message handlers */ | |
1598 | mbx->msg_data = msg_data; | |
1599 | ||
1600 | /* start mailbox as timed out and let the reset_hw call | |
1601 | * set the timeout value to begin communications | |
1602 | */ | |
1603 | mbx->timeout = 0; | |
1604 | mbx->udelay = FM10K_MBX_INIT_DELAY; | |
1605 | ||
eca32047 | 1606 | /* initialize tail and head */ |
b651957c AD |
1607 | mbx->tail = 1; |
1608 | mbx->head = 1; | |
1609 | ||
1610 | /* initialize CRC seeds */ | |
1611 | mbx->local = FM10K_MBX_CRC_SEED; | |
1612 | mbx->remote = FM10K_MBX_CRC_SEED; | |
1613 | ||
1614 | /* Split buffer for use by Tx/Rx FIFOs */ | |
1615 | mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; | |
1616 | mbx->mbmem_len = FM10K_VFMBMEM_VF_XOR; | |
1617 | ||
1618 | /* initialize the FIFOs, sizes are in 4 byte increments */ | |
1619 | fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE); | |
1620 | fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE], | |
1621 | FM10K_MBX_RX_BUFFER_SIZE); | |
1622 | ||
1623 | /* initialize function pointers */ | |
1624 | mbx->ops.connect = fm10k_mbx_connect; | |
1625 | mbx->ops.disconnect = fm10k_mbx_disconnect; | |
1626 | mbx->ops.rx_ready = fm10k_mbx_rx_ready; | |
1627 | mbx->ops.tx_ready = fm10k_mbx_tx_ready; | |
1628 | mbx->ops.tx_complete = fm10k_mbx_tx_complete; | |
1629 | mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx; | |
1630 | mbx->ops.process = fm10k_mbx_process; | |
1631 | mbx->ops.register_handlers = fm10k_mbx_register_handlers; | |
1632 | ||
1633 | return 0; | |
1634 | } | |
1635 | ||
1337e6b9 AD |
1636 | /** |
1637 | * fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO | |
1638 | * @mbx: pointer to mailbox | |
1639 | * | |
1640 | * This function returns a connection mailbox header | |
1641 | **/ | |
1642 | static void fm10k_sm_mbx_create_data_hdr(struct fm10k_mbx_info *mbx) | |
1643 | { | |
1644 | if (mbx->tail_len) | |
1645 | mbx->mbx_lock |= FM10K_MBX_REQ; | |
1646 | ||
1647 | mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) | | |
1648 | FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) | | |
1649 | FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD); | |
1650 | } | |
1651 | ||
1652 | /** | |
1653 | * fm10k_sm_mbx_create_connect_hdr - Generate a mailbox header for local FIFO | |
1654 | * @mbx: pointer to mailbox | |
1655 | * @err: error flags to report if any | |
1656 | * | |
1657 | * This function returns a connection mailbox header | |
1658 | **/ | |
1659 | static void fm10k_sm_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx, u8 err) | |
1660 | { | |
1661 | if (mbx->local) | |
1662 | mbx->mbx_lock |= FM10K_MBX_REQ; | |
1663 | ||
1664 | mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) | | |
1665 | FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) | | |
1666 | FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD) | | |
1667 | FM10K_MSG_HDR_FIELD_SET(err, SM_ERR); | |
1668 | } | |
1669 | ||
1670 | /** | |
1671 | * fm10k_sm_mbx_connect_reset - Reset following request for reset | |
1672 | * @mbx: pointer to mailbox | |
1673 | * | |
1674 | * This function resets the mailbox to a just connected state | |
1675 | **/ | |
1676 | static void fm10k_sm_mbx_connect_reset(struct fm10k_mbx_info *mbx) | |
1677 | { | |
1678 | /* flush any uncompleted work */ | |
1679 | fm10k_mbx_reset_work(mbx); | |
1680 | ||
1681 | /* set local version to max and remote version to 0 */ | |
1682 | mbx->local = FM10K_SM_MBX_VERSION; | |
1683 | mbx->remote = 0; | |
1684 | ||
eca32047 | 1685 | /* initialize tail and head */ |
1337e6b9 AD |
1686 | mbx->tail = 1; |
1687 | mbx->head = 1; | |
1688 | ||
1689 | /* reset state back to connect */ | |
1690 | mbx->state = FM10K_STATE_CONNECT; | |
1691 | } | |
1692 | ||
1693 | /** | |
1694 | * fm10k_sm_mbx_connect - Start switch manager mailbox connection | |
1695 | * @hw: pointer to hardware structure | |
1696 | * @mbx: pointer to mailbox | |
1697 | * | |
1698 | * This function will initiate a mailbox connection with the switch | |
1699 | * manager. To do this it will first disconnect the mailbox, and then | |
1700 | * reconnect it in order to complete a reset of the mailbox. | |
1701 | * | |
1702 | * This function will return an error if the mailbox has not been initiated | |
1703 | * or is currently in use. | |
1704 | **/ | |
1705 | static s32 fm10k_sm_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) | |
1706 | { | |
1707 | /* we cannot connect an uninitialized mailbox */ | |
1708 | if (!mbx->rx.buffer) | |
1709 | return FM10K_MBX_ERR_NO_SPACE; | |
1710 | ||
1711 | /* we cannot connect an already connected mailbox */ | |
1712 | if (mbx->state != FM10K_STATE_CLOSED) | |
1713 | return FM10K_MBX_ERR_BUSY; | |
1714 | ||
1715 | /* mailbox timeout can now become active */ | |
1716 | mbx->timeout = FM10K_MBX_INIT_TIMEOUT; | |
1717 | ||
1718 | /* Place mbx in ready to connect state */ | |
1719 | mbx->state = FM10K_STATE_CONNECT; | |
1720 | mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; | |
1721 | ||
1722 | /* reset interface back to connect */ | |
1723 | fm10k_sm_mbx_connect_reset(mbx); | |
1724 | ||
1725 | /* enable interrupt and notify other party of new message */ | |
1726 | mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT | | |
1727 | FM10K_MBX_INTERRUPT_ENABLE; | |
1728 | ||
1729 | /* generate and load connect header into mailbox */ | |
1730 | fm10k_sm_mbx_create_connect_hdr(mbx, 0); | |
1731 | fm10k_mbx_write(hw, mbx); | |
1732 | ||
1733 | /* enable interrupt and notify other party of new message */ | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
1738 | /** | |
1739 | * fm10k_sm_mbx_disconnect - Shutdown mailbox connection | |
1740 | * @hw: pointer to hardware structure | |
1741 | * @mbx: pointer to mailbox | |
1742 | * | |
1743 | * This function will shut down the mailbox. It places the mailbox first | |
1744 | * in the disconnect state, it then allows up to a predefined timeout for | |
1745 | * the mailbox to transition to close on its own. If this does not occur | |
1746 | * then the mailbox will be forced into the closed state. | |
1747 | * | |
1748 | * Any mailbox transactions not completed before calling this function | |
1749 | * are not guaranteed to complete and may be dropped. | |
1750 | **/ | |
1751 | static void fm10k_sm_mbx_disconnect(struct fm10k_hw *hw, | |
1752 | struct fm10k_mbx_info *mbx) | |
1753 | { | |
1754 | int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0; | |
1755 | ||
1756 | /* Place mbx in ready to disconnect state */ | |
1757 | mbx->state = FM10K_STATE_DISCONNECT; | |
1758 | ||
1759 | /* trigger interrupt to start shutdown process */ | |
1760 | fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ | | |
1761 | FM10K_MBX_INTERRUPT_DISABLE); | |
1762 | do { | |
1763 | udelay(FM10K_MBX_POLL_DELAY); | |
1764 | mbx->ops.process(hw, mbx); | |
1765 | timeout -= FM10K_MBX_POLL_DELAY; | |
1766 | } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED)); | |
1767 | ||
1768 | /* in case we didn't close just force the mailbox into shutdown */ | |
1769 | mbx->state = FM10K_STATE_CLOSED; | |
1770 | mbx->remote = 0; | |
1771 | fm10k_mbx_reset_work(mbx); | |
4b09728e | 1772 | fm10k_fifo_drop_all(&mbx->tx); |
1337e6b9 AD |
1773 | |
1774 | fm10k_write_reg(hw, mbx->mbmem_reg, 0); | |
1775 | } | |
1776 | ||
1777 | /** | |
1778 | * fm10k_mbx_validate_fifo_hdr - Validate fields in the remote FIFO header | |
1779 | * @mbx: pointer to mailbox | |
1780 | * | |
1781 | * This function will parse up the fields in the mailbox header and return | |
1782 | * an error if the header contains any of a number of invalid configurations | |
1783 | * including unrecognized offsets or version numbers. | |
1784 | **/ | |
1785 | static s32 fm10k_sm_mbx_validate_fifo_hdr(struct fm10k_mbx_info *mbx) | |
1786 | { | |
1787 | const u32 *hdr = &mbx->mbx_hdr; | |
1788 | u16 tail, head, ver; | |
1789 | ||
1790 | tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL); | |
1791 | ver = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_VER); | |
1792 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD); | |
1793 | ||
1794 | switch (ver) { | |
1795 | case 0: | |
1796 | break; | |
1797 | case FM10K_SM_MBX_VERSION: | |
1798 | if (!head || head > FM10K_SM_MBX_FIFO_LEN) | |
1799 | return FM10K_MBX_ERR_HEAD; | |
1800 | if (!tail || tail > FM10K_SM_MBX_FIFO_LEN) | |
1801 | return FM10K_MBX_ERR_TAIL; | |
1802 | if (mbx->tail < head) | |
1803 | head += mbx->mbmem_len - 1; | |
1804 | if (tail < mbx->head) | |
1805 | tail += mbx->mbmem_len - 1; | |
1806 | if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len) | |
1807 | return FM10K_MBX_ERR_HEAD; | |
1808 | if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len) | |
1809 | break; | |
1810 | return FM10K_MBX_ERR_TAIL; | |
1811 | default: | |
1812 | return FM10K_MBX_ERR_SRC; | |
1813 | } | |
1814 | ||
1815 | return 0; | |
1816 | } | |
1817 | ||
1818 | /** | |
1819 | * fm10k_sm_mbx_process_error - Process header with error flag set | |
1820 | * @mbx: pointer to mailbox | |
1821 | * | |
1822 | * This function is meant to respond to a request where the error flag | |
1823 | * is set. As a result we will terminate a connection if one is present | |
1824 | * and fall back into the reset state with a connection header of version | |
1825 | * 0 (RESET). | |
1826 | **/ | |
1827 | static void fm10k_sm_mbx_process_error(struct fm10k_mbx_info *mbx) | |
1828 | { | |
1829 | const enum fm10k_mbx_state state = mbx->state; | |
1830 | ||
1831 | switch (state) { | |
1832 | case FM10K_STATE_DISCONNECT: | |
1833 | /* if there is an error just disconnect */ | |
1834 | mbx->remote = 0; | |
1835 | break; | |
1836 | case FM10K_STATE_OPEN: | |
1837 | /* flush any uncompleted work */ | |
1838 | fm10k_sm_mbx_connect_reset(mbx); | |
1839 | break; | |
1840 | case FM10K_STATE_CONNECT: | |
1841 | /* try connnecting at lower version */ | |
1842 | if (mbx->remote) { | |
1843 | while (mbx->local > 1) | |
1844 | mbx->local--; | |
1845 | mbx->remote = 0; | |
1846 | } | |
1847 | break; | |
1848 | default: | |
1849 | break; | |
1850 | } | |
1851 | ||
1852 | fm10k_sm_mbx_create_connect_hdr(mbx, 0); | |
1853 | } | |
1854 | ||
1855 | /** | |
1856 | * fm10k_sm_mbx_create_error_message - Process an error in FIFO hdr | |
1857 | * @mbx: pointer to mailbox | |
1858 | * @err: local error encountered | |
1859 | * | |
1860 | * This function will interpret the error provided by err, and based on | |
1861 | * that it may set the error bit in the local message header | |
1862 | **/ | |
1863 | static void fm10k_sm_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err) | |
1864 | { | |
1865 | /* only generate an error message for these types */ | |
1866 | switch (err) { | |
1867 | case FM10K_MBX_ERR_TAIL: | |
1868 | case FM10K_MBX_ERR_HEAD: | |
1869 | case FM10K_MBX_ERR_SRC: | |
1870 | case FM10K_MBX_ERR_SIZE: | |
1871 | case FM10K_MBX_ERR_RSVD0: | |
1872 | break; | |
1873 | default: | |
1874 | return; | |
1875 | } | |
1876 | ||
1877 | /* process it as though we received an error, and send error reply */ | |
1878 | fm10k_sm_mbx_process_error(mbx); | |
1879 | fm10k_sm_mbx_create_connect_hdr(mbx, 1); | |
1880 | } | |
1881 | ||
1882 | /** | |
1883 | * fm10k_sm_mbx_receive - Take message from Rx mailbox FIFO and put it in Rx | |
1884 | * @hw: pointer to hardware structure | |
1885 | * @mbx: pointer to mailbox | |
1886 | * | |
1887 | * This function will dequeue one message from the Rx switch manager mailbox | |
1888 | * FIFO and place it in the Rx mailbox FIFO for processing by software. | |
1889 | **/ | |
1890 | static s32 fm10k_sm_mbx_receive(struct fm10k_hw *hw, | |
1891 | struct fm10k_mbx_info *mbx, | |
1892 | u16 tail) | |
1893 | { | |
1894 | /* reduce length by 1 to convert to a mask */ | |
1895 | u16 mbmem_len = mbx->mbmem_len - 1; | |
1896 | s32 err; | |
1897 | ||
1898 | /* push tail in front of head */ | |
1899 | if (tail < mbx->head) | |
1900 | tail += mbmem_len; | |
1901 | ||
1902 | /* copy data to the Rx FIFO */ | |
1903 | err = fm10k_mbx_push_tail(hw, mbx, tail); | |
1904 | if (err < 0) | |
1905 | return err; | |
1906 | ||
1907 | /* process messages if we have received any */ | |
1908 | fm10k_mbx_dequeue_rx(hw, mbx); | |
1909 | ||
1910 | /* guarantee head aligns with the end of the last message */ | |
1911 | mbx->head = fm10k_mbx_head_sub(mbx, mbx->pushed); | |
1912 | mbx->pushed = 0; | |
1913 | ||
1914 | /* clear any extra bits left over since index adds 1 extra bit */ | |
1915 | if (mbx->head > mbmem_len) | |
1916 | mbx->head -= mbmem_len; | |
1917 | ||
1918 | return err; | |
1919 | } | |
1920 | ||
1921 | /** | |
1922 | * fm10k_sm_mbx_transmit - Take message from Tx and put it in Tx mailbox FIFO | |
1923 | * @hw: pointer to hardware structure | |
1924 | * @mbx: pointer to mailbox | |
1925 | * | |
1926 | * This function will dequeue one message from the Tx mailbox FIFO and place | |
1927 | * it in the Tx switch manager mailbox FIFO for processing by hardware. | |
1928 | **/ | |
1929 | static void fm10k_sm_mbx_transmit(struct fm10k_hw *hw, | |
1930 | struct fm10k_mbx_info *mbx, u16 head) | |
1931 | { | |
1932 | struct fm10k_mbx_fifo *fifo = &mbx->tx; | |
1933 | /* reduce length by 1 to convert to a mask */ | |
1934 | u16 mbmem_len = mbx->mbmem_len - 1; | |
1935 | u16 tail_len, len = 0; | |
1936 | u32 *msg; | |
1937 | ||
1938 | /* push head behind tail */ | |
1939 | if (mbx->tail < head) | |
1940 | head += mbmem_len; | |
1941 | ||
1942 | fm10k_mbx_pull_head(hw, mbx, head); | |
1943 | ||
1944 | /* determine msg aligned offset for end of buffer */ | |
1945 | do { | |
1946 | msg = fifo->buffer + fm10k_fifo_head_offset(fifo, len); | |
1947 | tail_len = len; | |
1948 | len += FM10K_TLV_DWORD_LEN(*msg); | |
1949 | } while ((len <= mbx->tail_len) && (len < mbmem_len)); | |
1950 | ||
1951 | /* guarantee we stop on a message boundary */ | |
1952 | if (mbx->tail_len > tail_len) { | |
1953 | mbx->tail = fm10k_mbx_tail_sub(mbx, mbx->tail_len - tail_len); | |
1954 | mbx->tail_len = tail_len; | |
1955 | } | |
1956 | ||
1957 | /* clear any extra bits left over since index adds 1 extra bit */ | |
1958 | if (mbx->tail > mbmem_len) | |
1959 | mbx->tail -= mbmem_len; | |
1960 | } | |
1961 | ||
1962 | /** | |
1963 | * fm10k_sm_mbx_create_reply - Generate reply based on state and remote head | |
1964 | * @mbx: pointer to mailbox | |
1965 | * @head: acknowledgement number | |
1966 | * | |
1967 | * This function will generate an outgoing message based on the current | |
1968 | * mailbox state and the remote fifo head. It will return the length | |
1969 | * of the outgoing message excluding header on success, and a negative value | |
1970 | * on error. | |
1971 | **/ | |
1972 | static void fm10k_sm_mbx_create_reply(struct fm10k_hw *hw, | |
1973 | struct fm10k_mbx_info *mbx, u16 head) | |
1974 | { | |
1975 | switch (mbx->state) { | |
1976 | case FM10K_STATE_OPEN: | |
1977 | case FM10K_STATE_DISCONNECT: | |
1978 | /* flush out Tx data */ | |
1979 | fm10k_sm_mbx_transmit(hw, mbx, head); | |
1980 | ||
1981 | /* generate new header based on data */ | |
1982 | if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) { | |
1983 | fm10k_sm_mbx_create_data_hdr(mbx); | |
1984 | } else { | |
1985 | mbx->remote = 0; | |
1986 | fm10k_sm_mbx_create_connect_hdr(mbx, 0); | |
1987 | } | |
1988 | break; | |
1989 | case FM10K_STATE_CONNECT: | |
1990 | case FM10K_STATE_CLOSED: | |
1991 | fm10k_sm_mbx_create_connect_hdr(mbx, 0); | |
1992 | break; | |
1993 | default: | |
1994 | break; | |
1995 | } | |
1996 | } | |
1997 | ||
1998 | /** | |
1999 | * fm10k_sm_mbx_process_reset - Process header with version == 0 (RESET) | |
2000 | * @hw: pointer to hardware structure | |
2001 | * @mbx: pointer to mailbox | |
2002 | * | |
2003 | * This function is meant to respond to a request where the version data | |
2004 | * is set to 0. As such we will either terminate the connection or go | |
2005 | * into the connect state in order to re-establish the connection. This | |
2006 | * function can also be used to respond to an error as the connection | |
2007 | * resetting would also be a means of dealing with errors. | |
2008 | **/ | |
2009 | static void fm10k_sm_mbx_process_reset(struct fm10k_hw *hw, | |
2010 | struct fm10k_mbx_info *mbx) | |
2011 | { | |
2012 | const enum fm10k_mbx_state state = mbx->state; | |
2013 | ||
2014 | switch (state) { | |
2015 | case FM10K_STATE_DISCONNECT: | |
2016 | /* drop remote connections and disconnect */ | |
2017 | mbx->state = FM10K_STATE_CLOSED; | |
2018 | mbx->remote = 0; | |
2019 | mbx->local = 0; | |
2020 | break; | |
2021 | case FM10K_STATE_OPEN: | |
2022 | /* flush any incomplete work */ | |
2023 | fm10k_sm_mbx_connect_reset(mbx); | |
2024 | break; | |
2025 | case FM10K_STATE_CONNECT: | |
2026 | /* Update remote value to match local value */ | |
2027 | mbx->remote = mbx->local; | |
2028 | default: | |
2029 | break; | |
2030 | } | |
2031 | ||
2032 | fm10k_sm_mbx_create_reply(hw, mbx, mbx->tail); | |
2033 | } | |
2034 | ||
2035 | /** | |
2036 | * fm10k_sm_mbx_process_version_1 - Process header with version == 1 | |
2037 | * @hw: pointer to hardware structure | |
2038 | * @mbx: pointer to mailbox | |
2039 | * | |
2040 | * This function is meant to process messages received when the remote | |
2041 | * mailbox is active. | |
2042 | **/ | |
2043 | static s32 fm10k_sm_mbx_process_version_1(struct fm10k_hw *hw, | |
2044 | struct fm10k_mbx_info *mbx) | |
2045 | { | |
2046 | const u32 *hdr = &mbx->mbx_hdr; | |
2047 | u16 head, tail; | |
2048 | s32 len; | |
2049 | ||
2050 | /* pull all fields needed for verification */ | |
2051 | tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL); | |
2052 | head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD); | |
2053 | ||
2054 | /* if we are in connect and wanting version 1 then start up and go */ | |
2055 | if (mbx->state == FM10K_STATE_CONNECT) { | |
2056 | if (!mbx->remote) | |
2057 | goto send_reply; | |
2058 | if (mbx->remote != 1) | |
2059 | return FM10K_MBX_ERR_SRC; | |
2060 | ||
2061 | mbx->state = FM10K_STATE_OPEN; | |
2062 | } | |
2063 | ||
2064 | do { | |
2065 | /* abort on message size errors */ | |
2066 | len = fm10k_sm_mbx_receive(hw, mbx, tail); | |
2067 | if (len < 0) | |
2068 | return len; | |
2069 | ||
2070 | /* continue until we have flushed the Rx FIFO */ | |
2071 | } while (len); | |
2072 | ||
2073 | send_reply: | |
2074 | fm10k_sm_mbx_create_reply(hw, mbx, head); | |
2075 | ||
2076 | return 0; | |
2077 | } | |
2078 | ||
2079 | /** | |
2080 | * fm10k_sm_mbx_process - Process mailbox switch mailbox interrupt | |
2081 | * @hw: pointer to hardware structure | |
2082 | * @mbx: pointer to mailbox | |
2083 | * | |
2084 | * This function will process incoming mailbox events and generate mailbox | |
2085 | * replies. It will return a value indicating the number of DWORDs | |
2086 | * transmitted excluding header on success or a negative value on error. | |
2087 | **/ | |
2088 | static s32 fm10k_sm_mbx_process(struct fm10k_hw *hw, | |
2089 | struct fm10k_mbx_info *mbx) | |
2090 | { | |
2091 | s32 err; | |
2092 | ||
2093 | /* we do not read mailbox if closed */ | |
2094 | if (mbx->state == FM10K_STATE_CLOSED) | |
2095 | return 0; | |
2096 | ||
2097 | /* retrieve data from switch manager */ | |
2098 | err = fm10k_mbx_read(hw, mbx); | |
2099 | if (err) | |
2100 | return err; | |
2101 | ||
2102 | err = fm10k_sm_mbx_validate_fifo_hdr(mbx); | |
2103 | if (err < 0) | |
2104 | goto fifo_err; | |
2105 | ||
2106 | if (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_ERR)) { | |
2107 | fm10k_sm_mbx_process_error(mbx); | |
2108 | goto fifo_err; | |
2109 | } | |
2110 | ||
2111 | switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_VER)) { | |
2112 | case 0: | |
2113 | fm10k_sm_mbx_process_reset(hw, mbx); | |
2114 | break; | |
2115 | case FM10K_SM_MBX_VERSION: | |
2116 | err = fm10k_sm_mbx_process_version_1(hw, mbx); | |
2117 | break; | |
2118 | } | |
2119 | ||
2120 | fifo_err: | |
2121 | if (err < 0) | |
2122 | fm10k_sm_mbx_create_error_msg(mbx, err); | |
2123 | ||
2124 | /* report data to switch manager */ | |
2125 | fm10k_mbx_write(hw, mbx); | |
2126 | ||
2127 | return err; | |
2128 | } | |
2129 | ||
2130 | /** | |
2131 | * fm10k_sm_mbx_init - Initialize mailbox memory for PF/SM mailbox | |
2132 | * @hw: pointer to hardware structure | |
2133 | * @mbx: pointer to mailbox | |
2134 | * @msg_data: handlers for mailbox events | |
2135 | * | |
2136 | * This function for now is used to stub out the PF/SM mailbox | |
2137 | **/ | |
2138 | s32 fm10k_sm_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, | |
2139 | const struct fm10k_msg_data *msg_data) | |
2140 | { | |
2141 | mbx->mbx_reg = FM10K_GMBX; | |
2142 | mbx->mbmem_reg = FM10K_MBMEM_PF(0); | |
a4fcad65 | 2143 | |
1337e6b9 AD |
2144 | /* start out in closed state */ |
2145 | mbx->state = FM10K_STATE_CLOSED; | |
2146 | ||
2147 | /* validate layout of handlers before assigning them */ | |
2148 | if (fm10k_mbx_validate_handlers(msg_data)) | |
2149 | return FM10K_ERR_PARAM; | |
2150 | ||
2151 | /* initialize the message handlers */ | |
2152 | mbx->msg_data = msg_data; | |
2153 | ||
2154 | /* start mailbox as timed out and let the reset_hw call | |
2155 | * set the timeout value to begin communications | |
2156 | */ | |
2157 | mbx->timeout = 0; | |
2158 | mbx->udelay = FM10K_MBX_INIT_DELAY; | |
2159 | ||
2160 | /* Split buffer for use by Tx/Rx FIFOs */ | |
2161 | mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; | |
2162 | mbx->mbmem_len = FM10K_MBMEM_PF_XOR; | |
2163 | ||
2164 | /* initialize the FIFOs, sizes are in 4 byte increments */ | |
2165 | fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE); | |
2166 | fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE], | |
2167 | FM10K_MBX_RX_BUFFER_SIZE); | |
2168 | ||
2169 | /* initialize function pointers */ | |
2170 | mbx->ops.connect = fm10k_sm_mbx_connect; | |
2171 | mbx->ops.disconnect = fm10k_sm_mbx_disconnect; | |
2172 | mbx->ops.rx_ready = fm10k_mbx_rx_ready; | |
2173 | mbx->ops.tx_ready = fm10k_mbx_tx_ready; | |
2174 | mbx->ops.tx_complete = fm10k_mbx_tx_complete; | |
2175 | mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx; | |
2176 | mbx->ops.process = fm10k_sm_mbx_process; | |
2177 | mbx->ops.register_handlers = fm10k_mbx_register_handlers; | |
2178 | ||
2179 | return 0; | |
2180 | } |