1 /*******************************************************************************
3 Copyright (c) 2013 - 2015, Intel Corporation
6 Redistribution and use in source and binary forms, with or without
7 modification, are permitted provided that the following conditions are met:
9 1. Redistributions of source code must retain the above copyright notice,
10 this list of conditions and the following disclaimer.
12 2. Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in the
14 documentation and/or other materials provided with the distribution.
16 3. Neither the name of the Intel Corporation nor the names of its
17 contributors may be used to endorse or promote products derived from
18 this software without specific prior written permission.
20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 POSSIBILITY OF SUCH DAMAGE.
32 ***************************************************************************/
34 #include "fm10k_common.h"
37 * fm10k_fifo_init - Initialize a message FIFO
38 * @fifo: pointer to FIFO
39 * @buffer: pointer to memory to be used to store FIFO
40 * @size: maximum message size to store in FIFO, must be 2^n - 1
42 STATIC void fm10k_fifo_init(struct fm10k_mbx_fifo *fifo, u32 *buffer, u16 size)
44 fifo->buffer = buffer;
51 * fm10k_fifo_used - Retrieve used space in FIFO
52 * @fifo: pointer to FIFO
54 * This function returns the number of DWORDs used in the FIFO
56 STATIC u16 fm10k_fifo_used(struct fm10k_mbx_fifo *fifo)
58 return fifo->tail - fifo->head;
62 * fm10k_fifo_unused - Retrieve unused space in FIFO
63 * @fifo: pointer to FIFO
65 * This function returns the number of unused DWORDs in the FIFO
67 STATIC u16 fm10k_fifo_unused(struct fm10k_mbx_fifo *fifo)
69 return fifo->size + fifo->head - fifo->tail;
73 * fm10k_fifo_empty - Test to verify if fifo is empty
74 * @fifo: pointer to FIFO
76 * This function returns true if the FIFO is empty, else false
78 STATIC bool fm10k_fifo_empty(struct fm10k_mbx_fifo *fifo)
80 return fifo->head == fifo->tail;
84 * fm10k_fifo_head_offset - returns indices of head with given offset
85 * @fifo: pointer to FIFO
86 * @offset: offset to add to head
88 * This function returns the indices into the fifo based on head + offset
90 STATIC u16 fm10k_fifo_head_offset(struct fm10k_mbx_fifo *fifo, u16 offset)
92 return (fifo->head + offset) & (fifo->size - 1);
96 * fm10k_fifo_tail_offset - returns indices of tail with given offset
97 * @fifo: pointer to FIFO
98 * @offset: offset to add to tail
100 * This function returns the indices into the fifo based on tail + offset
102 STATIC u16 fm10k_fifo_tail_offset(struct fm10k_mbx_fifo *fifo, u16 offset)
104 return (fifo->tail + offset) & (fifo->size - 1);
108 * fm10k_fifo_head_len - Retrieve length of first message in FIFO
109 * @fifo: pointer to FIFO
111 * This function returns the size of the first message in the FIFO
113 STATIC u16 fm10k_fifo_head_len(struct fm10k_mbx_fifo *fifo)
115 u32 *head = fifo->buffer + fm10k_fifo_head_offset(fifo, 0);
117 /* verify there is at least 1 DWORD in the fifo so *head is valid */
118 if (fm10k_fifo_empty(fifo))
121 /* retieve the message length */
122 return FM10K_TLV_DWORD_LEN(*head);
126 * fm10k_fifo_head_drop - Drop the first message in FIFO
127 * @fifo: pointer to FIFO
129 * This function returns the size of the message dropped from the FIFO
131 STATIC u16 fm10k_fifo_head_drop(struct fm10k_mbx_fifo *fifo)
133 u16 len = fm10k_fifo_head_len(fifo);
135 /* update head so it is at the start of next frame */
142 * fm10k_fifo_drop_all - Drop all messages in FIFO
143 * @fifo: pointer to FIFO
145 * This function resets the head pointer to drop all messages in the FIFO and
146 * ensure the FIFO is empty.
148 STATIC void fm10k_fifo_drop_all(struct fm10k_mbx_fifo *fifo)
150 fifo->head = fifo->tail;
154 * fm10k_mbx_index_len - Convert a head/tail index into a length value
155 * @mbx: pointer to mailbox
159 * This function takes the head and tail index and determines the length
160 * of the data indicated by this pair.
162 STATIC u16 fm10k_mbx_index_len(struct fm10k_mbx_info *mbx, u16 head, u16 tail)
164 u16 len = tail - head;
166 /* we wrapped so subtract 2, one for index 0, one for all 1s index */
170 return len & ((mbx->mbmem_len << 1) - 1);
174 * fm10k_mbx_tail_add - Determine new tail value with added offset
175 * @mbx: pointer to mailbox
176 * @offset: length to add to head offset
178 * This function takes the local tail index and recomputes it for
179 * a given length added as an offset.
181 STATIC u16 fm10k_mbx_tail_add(struct fm10k_mbx_info *mbx, u16 offset)
183 u16 tail = (mbx->tail + offset + 1) & ((mbx->mbmem_len << 1) - 1);
185 /* add/sub 1 because we cannot have offset 0 or all 1s */
186 return (tail > mbx->tail) ? --tail : ++tail;
190 * fm10k_mbx_tail_sub - Determine new tail value with subtracted offset
191 * @mbx: pointer to mailbox
192 * @offset: length to add to head offset
194 * This function takes the local tail index and recomputes it for
195 * a given length added as an offset.
197 STATIC u16 fm10k_mbx_tail_sub(struct fm10k_mbx_info *mbx, u16 offset)
199 u16 tail = (mbx->tail - offset - 1) & ((mbx->mbmem_len << 1) - 1);
201 /* sub/add 1 because we cannot have offset 0 or all 1s */
202 return (tail < mbx->tail) ? ++tail : --tail;
206 * fm10k_mbx_head_add - Determine new head value with added offset
207 * @mbx: pointer to mailbox
208 * @offset: length to add to head offset
210 * This function takes the local head index and recomputes it for
211 * a given length added as an offset.
213 STATIC u16 fm10k_mbx_head_add(struct fm10k_mbx_info *mbx, u16 offset)
215 u16 head = (mbx->head + offset + 1) & ((mbx->mbmem_len << 1) - 1);
217 /* add/sub 1 because we cannot have offset 0 or all 1s */
218 return (head > mbx->head) ? --head : ++head;
222 * fm10k_mbx_head_sub - Determine new head value with subtracted offset
223 * @mbx: pointer to mailbox
224 * @offset: length to add to head offset
226 * This function takes the local head index and recomputes it for
227 * a given length added as an offset.
229 STATIC u16 fm10k_mbx_head_sub(struct fm10k_mbx_info *mbx, u16 offset)
231 u16 head = (mbx->head - offset - 1) & ((mbx->mbmem_len << 1) - 1);
233 /* sub/add 1 because we cannot have offset 0 or all 1s */
234 return (head < mbx->head) ? ++head : --head;
238 * fm10k_mbx_pushed_tail_len - Retrieve the length of message being pushed
239 * @mbx: pointer to mailbox
241 * This function will return the length of the message currently being
242 * pushed onto the tail of the Rx queue.
244 STATIC u16 fm10k_mbx_pushed_tail_len(struct fm10k_mbx_info *mbx)
246 u32 *tail = mbx->rx.buffer + fm10k_fifo_tail_offset(&mbx->rx, 0);
248 /* pushed tail is only valid if pushed is set */
252 return FM10K_TLV_DWORD_LEN(*tail);
256 * fm10k_fifo_write_copy - pulls data off of msg and places it in fifo
257 * @fifo: pointer to FIFO
258 * @msg: message array to populate
259 * @tail_offset: additional offset to add to tail pointer
260 * @len: length of FIFO to copy into message header
262 * This function will take a message and copy it into a section of the
263 * FIFO. In order to get something into a location other than just
264 * the tail you can use tail_offset to adjust the pointer.
266 STATIC void fm10k_fifo_write_copy(struct fm10k_mbx_fifo *fifo,
267 const u32 *msg, u16 tail_offset, u16 len)
269 u16 end = fm10k_fifo_tail_offset(fifo, tail_offset);
270 u32 *tail = fifo->buffer + end;
272 /* track when we should cross the end of the FIFO */
273 end = fifo->size - end;
275 /* copy end of message before start of message */
277 memcpy(fifo->buffer, msg + end, (len - end) << 2);
281 /* Copy remaining message into Tx FIFO */
282 memcpy(tail, msg, end << 2);
286 * fm10k_fifo_enqueue - Enqueues the message to the tail of the FIFO
287 * @fifo: pointer to FIFO
288 * @msg: message array to read
290 * This function enqueues a message up to the size specified by the length
291 * contained in the first DWORD of the message and will place at the tail
292 * of the FIFO. It will return 0 on success, or a negative value on error.
294 STATIC s32 fm10k_fifo_enqueue(struct fm10k_mbx_fifo *fifo, const u32 *msg)
296 u16 len = FM10K_TLV_DWORD_LEN(*msg);
298 DEBUGFUNC("fm10k_fifo_enqueue");
300 /* verify parameters */
301 if (len > fifo->size)
302 return FM10K_MBX_ERR_SIZE;
304 /* verify there is room for the message */
305 if (len > fm10k_fifo_unused(fifo))
306 return FM10K_MBX_ERR_NO_SPACE;
308 /* Copy message into FIFO */
309 fm10k_fifo_write_copy(fifo, msg, 0, len);
311 /* memory barrier to guarantee FIFO is written before tail update */
314 /* Update Tx FIFO tail */
317 return FM10K_SUCCESS;
321 * fm10k_mbx_validate_msg_size - Validate incoming message based on size
322 * @mbx: pointer to mailbox
323 * @len: length of data pushed onto buffer
325 * This function analyzes the frame and will return a non-zero value when
326 * the start of a message larger than the mailbox is detected.
328 STATIC u16 fm10k_mbx_validate_msg_size(struct fm10k_mbx_info *mbx, u16 len)
330 struct fm10k_mbx_fifo *fifo = &mbx->rx;
331 u16 total_len = 0, msg_len;
334 DEBUGFUNC("fm10k_mbx_validate_msg");
336 /* length should include previous amounts pushed */
339 /* offset in message is based off of current message size */
341 msg = fifo->buffer + fm10k_fifo_tail_offset(fifo, total_len);
342 msg_len = FM10K_TLV_DWORD_LEN(*msg);
343 total_len += msg_len;
344 } while (total_len < len);
346 /* message extends out of pushed section, but fits in FIFO */
347 if ((len < total_len) && (msg_len <= mbx->max_size))
350 /* return length of invalid section */
351 return (len < total_len) ? len : (len - total_len);
355 * fm10k_mbx_write_copy - pulls data off of Tx FIFO and places it in mbmem
356 * @mbx: pointer to mailbox
358 * This function will take a section of the Tx FIFO and copy it into the
359 * mailbox memory. The offset in mbmem is based on the lower bits of the
360 * tail and len determines the length to copy.
362 STATIC void fm10k_mbx_write_copy(struct fm10k_hw *hw,
363 struct fm10k_mbx_info *mbx)
365 struct fm10k_mbx_fifo *fifo = &mbx->tx;
366 u32 mbmem = mbx->mbmem_reg;
367 u32 *head = fifo->buffer;
368 u16 end, len, tail, mask;
370 DEBUGFUNC("fm10k_mbx_write_copy");
375 /* determine data length and mbmem tail index */
376 mask = mbx->mbmem_len - 1;
378 tail = fm10k_mbx_tail_sub(mbx, len);
382 /* determine offset in the ring */
383 end = fm10k_fifo_head_offset(fifo, mbx->pulled);
386 /* memory barrier to guarantee data is ready to be read */
389 /* Copy message from Tx FIFO */
390 for (end = fifo->size - end; len; head = fifo->buffer) {
392 /* adjust tail to match offset for FIFO */
397 /* write message to hardware FIFO */
398 FM10K_WRITE_MBX(hw, mbmem + tail++, *(head++));
399 } while (--len && --end);
404 * fm10k_mbx_pull_head - Pulls data off of head of Tx FIFO
405 * @hw: pointer to hardware structure
406 * @mbx: pointer to mailbox
407 * @head: acknowledgement number last received
409 * This function will push the tail index forward based on the remote
410 * head index. It will then pull up to mbmem_len DWORDs off of the
411 * head of the FIFO and will place it in the MBMEM registers
412 * associated with the mailbox.
414 STATIC void fm10k_mbx_pull_head(struct fm10k_hw *hw,
415 struct fm10k_mbx_info *mbx, u16 head)
417 u16 mbmem_len, len, ack = fm10k_mbx_index_len(mbx, head, mbx->tail);
418 struct fm10k_mbx_fifo *fifo = &mbx->tx;
420 /* update number of bytes pulled and update bytes in transit */
421 mbx->pulled += mbx->tail_len - ack;
423 /* determine length of data to pull, reserve space for mbmem header */
424 mbmem_len = mbx->mbmem_len - 1;
425 len = fm10k_fifo_used(fifo) - mbx->pulled;
429 /* update tail and record number of bytes in transit */
430 mbx->tail = fm10k_mbx_tail_add(mbx, len - ack);
433 /* drop pulled messages from the FIFO */
434 for (len = fm10k_fifo_head_len(fifo);
435 len && (mbx->pulled >= len);
436 len = fm10k_fifo_head_len(fifo)) {
437 mbx->pulled -= fm10k_fifo_head_drop(fifo);
439 mbx->tx_dwords += len;
442 /* Copy message out from the Tx FIFO */
443 fm10k_mbx_write_copy(hw, mbx);
447 * fm10k_mbx_read_copy - pulls data off of mbmem and places it in Rx FIFO
448 * @hw: pointer to hardware structure
449 * @mbx: pointer to mailbox
451 * This function will take a section of the mailbox memory and copy it
452 * into the Rx FIFO. The offset is based on the lower bits of the
453 * head and len determines the length to copy.
455 STATIC void fm10k_mbx_read_copy(struct fm10k_hw *hw,
456 struct fm10k_mbx_info *mbx)
458 struct fm10k_mbx_fifo *fifo = &mbx->rx;
459 u32 mbmem = mbx->mbmem_reg ^ mbx->mbmem_len;
460 u32 *tail = fifo->buffer;
463 DEBUGFUNC("fm10k_mbx_read_copy");
465 /* determine data length and mbmem head index */
467 head = fm10k_mbx_head_sub(mbx, len);
468 if (head >= mbx->mbmem_len)
471 /* determine offset in the ring */
472 end = fm10k_fifo_tail_offset(fifo, mbx->pushed);
475 /* Copy message into Rx FIFO */
476 for (end = fifo->size - end; len; tail = fifo->buffer) {
478 /* adjust head to match offset for FIFO */
479 head &= mbx->mbmem_len - 1;
483 /* read message from hardware FIFO */
484 *(tail++) = FM10K_READ_MBX(hw, mbmem + head++);
485 } while (--len && --end);
488 /* memory barrier to guarantee FIFO is written before tail update */
493 * fm10k_mbx_push_tail - Pushes up to 15 DWORDs on to tail of FIFO
494 * @hw: pointer to hardware structure
495 * @mbx: pointer to mailbox
496 * @tail: tail index of message
498 * This function will first validate the tail index and size for the
499 * incoming message. It then updates the acknowledgment number and
500 * copies the data into the FIFO. It will return the number of messages
501 * dequeued on success and a negative value on error.
503 STATIC s32 fm10k_mbx_push_tail(struct fm10k_hw *hw,
504 struct fm10k_mbx_info *mbx,
507 struct fm10k_mbx_fifo *fifo = &mbx->rx;
508 u16 len, seq = fm10k_mbx_index_len(mbx, mbx->head, tail);
510 DEBUGFUNC("fm10k_mbx_push_tail");
512 /* determine length of data to push */
513 len = fm10k_fifo_unused(fifo) - mbx->pushed;
517 /* update head and record bytes received */
518 mbx->head = fm10k_mbx_head_add(mbx, len);
521 /* nothing to do if there is no data */
523 return FM10K_SUCCESS;
525 /* Copy msg into Rx FIFO */
526 fm10k_mbx_read_copy(hw, mbx);
528 /* determine if there are any invalid lengths in message */
529 if (fm10k_mbx_validate_msg_size(mbx, len))
530 return FM10K_MBX_ERR_SIZE;
535 /* flush any completed messages */
536 for (len = fm10k_mbx_pushed_tail_len(mbx);
537 len && (mbx->pushed >= len);
538 len = fm10k_mbx_pushed_tail_len(mbx)) {
542 mbx->rx_dwords += len;
545 return FM10K_SUCCESS;
548 /* pre-generated data for generating the CRC based on the poly 0xAC9A. */
549 static const u16 fm10k_crc_16b_table[256] = {
550 0x0000, 0x7956, 0xF2AC, 0x8BFA, 0xBC6D, 0xC53B, 0x4EC1, 0x3797,
551 0x21EF, 0x58B9, 0xD343, 0xAA15, 0x9D82, 0xE4D4, 0x6F2E, 0x1678,
552 0x43DE, 0x3A88, 0xB172, 0xC824, 0xFFB3, 0x86E5, 0x0D1F, 0x7449,
553 0x6231, 0x1B67, 0x909D, 0xE9CB, 0xDE5C, 0xA70A, 0x2CF0, 0x55A6,
554 0x87BC, 0xFEEA, 0x7510, 0x0C46, 0x3BD1, 0x4287, 0xC97D, 0xB02B,
555 0xA653, 0xDF05, 0x54FF, 0x2DA9, 0x1A3E, 0x6368, 0xE892, 0x91C4,
556 0xC462, 0xBD34, 0x36CE, 0x4F98, 0x780F, 0x0159, 0x8AA3, 0xF3F5,
557 0xE58D, 0x9CDB, 0x1721, 0x6E77, 0x59E0, 0x20B6, 0xAB4C, 0xD21A,
558 0x564D, 0x2F1B, 0xA4E1, 0xDDB7, 0xEA20, 0x9376, 0x188C, 0x61DA,
559 0x77A2, 0x0EF4, 0x850E, 0xFC58, 0xCBCF, 0xB299, 0x3963, 0x4035,
560 0x1593, 0x6CC5, 0xE73F, 0x9E69, 0xA9FE, 0xD0A8, 0x5B52, 0x2204,
561 0x347C, 0x4D2A, 0xC6D0, 0xBF86, 0x8811, 0xF147, 0x7ABD, 0x03EB,
562 0xD1F1, 0xA8A7, 0x235D, 0x5A0B, 0x6D9C, 0x14CA, 0x9F30, 0xE666,
563 0xF01E, 0x8948, 0x02B2, 0x7BE4, 0x4C73, 0x3525, 0xBEDF, 0xC789,
564 0x922F, 0xEB79, 0x6083, 0x19D5, 0x2E42, 0x5714, 0xDCEE, 0xA5B8,
565 0xB3C0, 0xCA96, 0x416C, 0x383A, 0x0FAD, 0x76FB, 0xFD01, 0x8457,
566 0xAC9A, 0xD5CC, 0x5E36, 0x2760, 0x10F7, 0x69A1, 0xE25B, 0x9B0D,
567 0x8D75, 0xF423, 0x7FD9, 0x068F, 0x3118, 0x484E, 0xC3B4, 0xBAE2,
568 0xEF44, 0x9612, 0x1DE8, 0x64BE, 0x5329, 0x2A7F, 0xA185, 0xD8D3,
569 0xCEAB, 0xB7FD, 0x3C07, 0x4551, 0x72C6, 0x0B90, 0x806A, 0xF93C,
570 0x2B26, 0x5270, 0xD98A, 0xA0DC, 0x974B, 0xEE1D, 0x65E7, 0x1CB1,
571 0x0AC9, 0x739F, 0xF865, 0x8133, 0xB6A4, 0xCFF2, 0x4408, 0x3D5E,
572 0x68F8, 0x11AE, 0x9A54, 0xE302, 0xD495, 0xADC3, 0x2639, 0x5F6F,
573 0x4917, 0x3041, 0xBBBB, 0xC2ED, 0xF57A, 0x8C2C, 0x07D6, 0x7E80,
574 0xFAD7, 0x8381, 0x087B, 0x712D, 0x46BA, 0x3FEC, 0xB416, 0xCD40,
575 0xDB38, 0xA26E, 0x2994, 0x50C2, 0x6755, 0x1E03, 0x95F9, 0xECAF,
576 0xB909, 0xC05F, 0x4BA5, 0x32F3, 0x0564, 0x7C32, 0xF7C8, 0x8E9E,
577 0x98E6, 0xE1B0, 0x6A4A, 0x131C, 0x248B, 0x5DDD, 0xD627, 0xAF71,
578 0x7D6B, 0x043D, 0x8FC7, 0xF691, 0xC106, 0xB850, 0x33AA, 0x4AFC,
579 0x5C84, 0x25D2, 0xAE28, 0xD77E, 0xE0E9, 0x99BF, 0x1245, 0x6B13,
580 0x3EB5, 0x47E3, 0xCC19, 0xB54F, 0x82D8, 0xFB8E, 0x7074, 0x0922,
581 0x1F5A, 0x660C, 0xEDF6, 0x94A0, 0xA337, 0xDA61, 0x519B, 0x28CD };
584 * fm10k_crc_16b - Generate a 16 bit CRC for a region of 16 bit data
585 * @data: pointer to data to process
586 * @seed: seed value for CRC
587 * @len: length measured in 16 bits words
589 * This function will generate a CRC based on the polynomial 0xAC9A and
590 * whatever value is stored in the seed variable. Note that this
591 * value inverts the local seed and the result in order to capture all
592 * leading and trailing zeros.
594 STATIC u16 fm10k_crc_16b(const u32 *data, u16 seed, u16 len)
600 result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];
601 result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];
606 result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];
607 result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF];
614 * fm10k_fifo_crc - generate a CRC based off of FIFO data
615 * @fifo: pointer to FIFO
616 * @offset: offset point for start of FIFO
617 * @len: number of DWORDS words to process
618 * @seed: seed value for CRC
620 * This function generates a CRC for some region of the FIFO
622 STATIC u16 fm10k_fifo_crc(struct fm10k_mbx_fifo *fifo, u16 offset,
625 u32 *data = fifo->buffer + offset;
627 /* track when we should cross the end of the FIFO */
628 offset = fifo->size - offset;
630 /* if we are in 2 blocks process the end of the FIFO first */
632 seed = fm10k_crc_16b(data, seed, offset * 2);
637 /* process any remaining bits */
638 return fm10k_crc_16b(data, seed, len * 2);
642 * fm10k_mbx_update_local_crc - Update the local CRC for outgoing data
643 * @mbx: pointer to mailbox
644 * @head: head index provided by remote mailbox
646 * This function will generate the CRC for all data from the end of the
647 * last head update to the current one. It uses the result of the
648 * previous CRC as the seed for this update. The result is stored in
651 STATIC void fm10k_mbx_update_local_crc(struct fm10k_mbx_info *mbx, u16 head)
653 u16 len = mbx->tail_len - fm10k_mbx_index_len(mbx, head, mbx->tail);
655 /* determine the offset for the start of the region to be pulled */
656 head = fm10k_fifo_head_offset(&mbx->tx, mbx->pulled);
658 /* update local CRC to include all of the pulled data */
659 mbx->local = fm10k_fifo_crc(&mbx->tx, head, len, mbx->local);
663 * fm10k_mbx_verify_remote_crc - Verify the CRC is correct for current data
664 * @mbx: pointer to mailbox
666 * This function will take all data that has been provided from the remote
667 * end and generate a CRC for it. This is stored in mbx->remote. The
668 * CRC for the header is then computed and if the result is non-zero this
669 * is an error and we signal an error dropping all data and resetting the
672 STATIC s32 fm10k_mbx_verify_remote_crc(struct fm10k_mbx_info *mbx)
674 struct fm10k_mbx_fifo *fifo = &mbx->rx;
675 u16 len = mbx->head_len;
676 u16 offset = fm10k_fifo_tail_offset(fifo, mbx->pushed) - len;
679 /* update the remote CRC if new data has been received */
681 mbx->remote = fm10k_fifo_crc(fifo, offset, len, mbx->remote);
683 /* process the full header as we have to validate the CRC */
684 crc = fm10k_crc_16b(&mbx->mbx_hdr, mbx->remote, 1);
686 /* notify other end if we have a problem */
687 return crc ? FM10K_MBX_ERR_CRC : FM10K_SUCCESS;
691 * fm10k_mbx_rx_ready - Indicates that a message is ready in the Rx FIFO
692 * @mbx: pointer to mailbox
694 * This function returns true if there is a message in the Rx FIFO to dequeue.
696 STATIC bool fm10k_mbx_rx_ready(struct fm10k_mbx_info *mbx)
698 u16 msg_size = fm10k_fifo_head_len(&mbx->rx);
700 return msg_size && (fm10k_fifo_used(&mbx->rx) >= msg_size);
704 * fm10k_mbx_tx_ready - Indicates that the mailbox is in state ready for Tx
705 * @mbx: pointer to mailbox
706 * @len: verify free space is >= this value
708 * This function returns true if the mailbox is in a state ready to transmit.
710 STATIC bool fm10k_mbx_tx_ready(struct fm10k_mbx_info *mbx, u16 len)
712 u16 fifo_unused = fm10k_fifo_unused(&mbx->tx);
714 return (mbx->state == FM10K_STATE_OPEN) && (fifo_unused >= len);
718 * fm10k_mbx_tx_complete - Indicates that the Tx FIFO has been emptied
719 * @mbx: pointer to mailbox
721 * This function returns true if the Tx FIFO is empty.
723 STATIC bool fm10k_mbx_tx_complete(struct fm10k_mbx_info *mbx)
725 return fm10k_fifo_empty(&mbx->tx);
729 * fm10k_mbx_deqeueue_rx - Dequeues the message from the head in the Rx FIFO
730 * @hw: pointer to hardware structure
731 * @mbx: pointer to mailbox
733 * This function dequeues messages and hands them off to the tlv parser.
734 * It will return the number of messages processed when called.
736 STATIC u16 fm10k_mbx_dequeue_rx(struct fm10k_hw *hw,
737 struct fm10k_mbx_info *mbx)
739 struct fm10k_mbx_fifo *fifo = &mbx->rx;
743 /* parse Rx messages out of the Rx FIFO to empty it */
744 for (cnt = 0; !fm10k_fifo_empty(fifo); cnt++) {
745 err = fm10k_tlv_msg_parse(hw, fifo->buffer + fifo->head,
750 fm10k_fifo_head_drop(fifo);
753 /* shift remaining bytes back to start of FIFO */
754 memmove(fifo->buffer, fifo->buffer + fifo->tail, mbx->pushed << 2);
756 /* shift head and tail based on the memory we moved */
757 fifo->tail -= fifo->head;
764 * fm10k_mbx_enqueue_tx - Enqueues the message to the tail of the Tx FIFO
765 * @hw: pointer to hardware structure
766 * @mbx: pointer to mailbox
767 * @msg: message array to read
769 * This function enqueues a message up to the size specified by the length
770 * contained in the first DWORD of the message and will place at the tail
771 * of the FIFO. It will return 0 on success, or a negative value on error.
773 STATIC s32 fm10k_mbx_enqueue_tx(struct fm10k_hw *hw,
774 struct fm10k_mbx_info *mbx, const u32 *msg)
776 u32 countdown = mbx->timeout;
779 switch (mbx->state) {
780 case FM10K_STATE_CLOSED:
781 case FM10K_STATE_DISCONNECT:
782 return FM10K_MBX_ERR_NO_MBX;
787 /* enqueue the message on the Tx FIFO */
788 err = fm10k_fifo_enqueue(&mbx->tx, msg);
790 /* if it failed give the FIFO a chance to drain */
791 while (err && countdown) {
793 usec_delay(mbx->usec_delay);
794 mbx->ops.process(hw, mbx);
795 err = fm10k_fifo_enqueue(&mbx->tx, msg);
798 /* if we failed treat the error */
804 /* begin processing message, ignore errors as this is just meant
805 * to start the mailbox flow so we are not concerned if there
806 * is a bad error, or the mailbox is already busy with a request
809 mbx->ops.process(hw, mbx);
811 return FM10K_SUCCESS;
815 * fm10k_mbx_read - Copies the mbmem to local message buffer
816 * @hw: pointer to hardware structure
817 * @mbx: pointer to mailbox
819 * This function copies the message from the mbmem to the message array
821 STATIC s32 fm10k_mbx_read(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
823 DEBUGFUNC("fm10k_mbx_read");
825 /* only allow one reader in here at a time */
827 return FM10K_MBX_ERR_BUSY;
829 /* read to capture initial interrupt bits */
830 if (FM10K_READ_MBX(hw, mbx->mbx_reg) & FM10K_MBX_REQ_INTERRUPT)
831 mbx->mbx_lock = FM10K_MBX_ACK;
833 /* write back interrupt bits to clear */
834 FM10K_WRITE_MBX(hw, mbx->mbx_reg,
835 FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT);
837 /* read remote header */
838 mbx->mbx_hdr = FM10K_READ_MBX(hw, mbx->mbmem_reg ^ mbx->mbmem_len);
840 return FM10K_SUCCESS;
844 * fm10k_mbx_write - Copies the local message buffer to mbmem
845 * @hw: pointer to hardware structure
846 * @mbx: pointer to mailbox
848 * This function copies the message from the the message array to mbmem
850 STATIC void fm10k_mbx_write(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
852 u32 mbmem = mbx->mbmem_reg;
854 DEBUGFUNC("fm10k_mbx_write");
856 /* write new msg header to notify recipient of change */
857 FM10K_WRITE_MBX(hw, mbmem, mbx->mbx_hdr);
859 /* write mailbox to send interrupt */
861 FM10K_WRITE_MBX(hw, mbx->mbx_reg, mbx->mbx_lock);
863 /* we no longer are using the header so free it */
869 * fm10k_mbx_create_connect_hdr - Generate a connect mailbox header
870 * @mbx: pointer to mailbox
872 * This function returns a connection mailbox header
874 STATIC void fm10k_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx)
876 mbx->mbx_lock |= FM10K_MBX_REQ;
878 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_CONNECT, TYPE) |
879 FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD) |
880 FM10K_MSG_HDR_FIELD_SET(mbx->rx.size - 1, CONNECT_SIZE);
884 * fm10k_mbx_create_data_hdr - Generate a data mailbox header
885 * @mbx: pointer to mailbox
887 * This function returns a data mailbox header
889 STATIC void fm10k_mbx_create_data_hdr(struct fm10k_mbx_info *mbx)
891 u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DATA, TYPE) |
892 FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) |
893 FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);
894 struct fm10k_mbx_fifo *fifo = &mbx->tx;
898 mbx->mbx_lock |= FM10K_MBX_REQ;
900 /* generate CRC for data in flight and header */
901 crc = fm10k_fifo_crc(fifo, fm10k_fifo_head_offset(fifo, mbx->pulled),
902 mbx->tail_len, mbx->local);
903 crc = fm10k_crc_16b(&hdr, crc, 1);
905 /* load header to memory to be written */
906 mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC);
910 * fm10k_mbx_create_disconnect_hdr - Generate a disconnect mailbox header
911 * @mbx: pointer to mailbox
913 * This function returns a disconnect mailbox header
915 STATIC void fm10k_mbx_create_disconnect_hdr(struct fm10k_mbx_info *mbx)
917 u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DISCONNECT, TYPE) |
918 FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) |
919 FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);
920 u16 crc = fm10k_crc_16b(&hdr, mbx->local, 1);
922 mbx->mbx_lock |= FM10K_MBX_ACK;
924 /* load header to memory to be written */
925 mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC);
929 * fm10k_mbx_create_error_msg - Generate a error message
930 * @mbx: pointer to mailbox
931 * @err: local error encountered
933 * This function will interpret the error provided by err, and based on
934 * that it may shift the message by 1 DWORD and then place an error header
935 * at the start of the message.
937 STATIC void fm10k_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err)
939 /* only generate an error message for these types */
941 case FM10K_MBX_ERR_TAIL:
942 case FM10K_MBX_ERR_HEAD:
943 case FM10K_MBX_ERR_TYPE:
944 case FM10K_MBX_ERR_SIZE:
945 case FM10K_MBX_ERR_RSVD0:
946 case FM10K_MBX_ERR_CRC:
952 mbx->mbx_lock |= FM10K_MBX_REQ;
954 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_ERROR, TYPE) |
955 FM10K_MSG_HDR_FIELD_SET(err, ERR_NO) |
956 FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD);
960 * fm10k_mbx_validate_msg_hdr - Validate common fields in the message header
961 * @mbx: pointer to mailbox
962 * @msg: message array to read
964 * This function will parse up the fields in the mailbox header and return
965 * an error if the header contains any of a number of invalid configurations
966 * including unrecognized type, invalid route, or a malformed message.
968 STATIC s32 fm10k_mbx_validate_msg_hdr(struct fm10k_mbx_info *mbx)
970 u16 type, rsvd0, head, tail, size;
971 const u32 *hdr = &mbx->mbx_hdr;
973 DEBUGFUNC("fm10k_mbx_validate_msg_hdr");
975 type = FM10K_MSG_HDR_FIELD_GET(*hdr, TYPE);
976 rsvd0 = FM10K_MSG_HDR_FIELD_GET(*hdr, RSVD0);
977 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);
978 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
979 size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE);
982 return FM10K_MBX_ERR_RSVD0;
985 case FM10K_MSG_DISCONNECT:
986 /* validate that all data has been received */
987 if (tail != mbx->head)
988 return FM10K_MBX_ERR_TAIL;
992 /* validate that head is moving correctly */
993 if (!head || (head == FM10K_MSG_HDR_MASK(HEAD)))
994 return FM10K_MBX_ERR_HEAD;
995 if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len)
996 return FM10K_MBX_ERR_HEAD;
998 /* validate that tail is moving correctly */
999 if (!tail || (tail == FM10K_MSG_HDR_MASK(TAIL)))
1000 return FM10K_MBX_ERR_TAIL;
1001 if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len)
1004 return FM10K_MBX_ERR_TAIL;
1005 case FM10K_MSG_CONNECT:
1006 /* validate size is in range and is power of 2 mask */
1007 if ((size < FM10K_VFMBX_MSG_MTU) || (size & (size + 1)))
1008 return FM10K_MBX_ERR_SIZE;
1011 case FM10K_MSG_ERROR:
1012 if (!head || (head == FM10K_MSG_HDR_MASK(HEAD)))
1013 return FM10K_MBX_ERR_HEAD;
1014 /* neither create nor error include a tail offset */
1016 return FM10K_MBX_ERR_TAIL;
1020 return FM10K_MBX_ERR_TYPE;
1023 return FM10K_SUCCESS;
1027 * fm10k_mbx_create_reply - Generate reply based on state and remote head
1028 * @mbx: pointer to mailbox
1029 * @head: acknowledgement number
1031 * This function will generate an outgoing message based on the current
1032 * mailbox state and the remote fifo head. It will return the length
1033 * of the outgoing message excluding header on success, and a negative value
1036 STATIC s32 fm10k_mbx_create_reply(struct fm10k_hw *hw,
1037 struct fm10k_mbx_info *mbx, u16 head)
1039 switch (mbx->state) {
1040 case FM10K_STATE_OPEN:
1041 case FM10K_STATE_DISCONNECT:
1042 /* update our checksum for the outgoing data */
1043 fm10k_mbx_update_local_crc(mbx, head);
1045 /* as long as other end recognizes us keep sending data */
1046 fm10k_mbx_pull_head(hw, mbx, head);
1048 /* generate new header based on data */
1049 if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN))
1050 fm10k_mbx_create_data_hdr(mbx);
1052 fm10k_mbx_create_disconnect_hdr(mbx);
1054 case FM10K_STATE_CONNECT:
1055 /* send disconnect even if we aren't connected */
1056 fm10k_mbx_create_connect_hdr(mbx);
1058 case FM10K_STATE_CLOSED:
1059 /* generate new header based on data */
1060 fm10k_mbx_create_disconnect_hdr(mbx);
1065 return FM10K_SUCCESS;
1069 * fm10k_mbx_reset_work- Reset internal pointers for any pending work
1070 * @mbx: pointer to mailbox
1072 * This function will reset all internal pointers so any work in progress
1073 * is dropped. This call should occur every time we transition from the
1074 * open state to the connect state.
1076 STATIC void fm10k_mbx_reset_work(struct fm10k_mbx_info *mbx)
1080 /* reset our outgoing max size back to Rx limits */
1081 mbx->max_size = mbx->rx.size - 1;
1083 /* update mbx->pulled to account for tail_len and ack */
1084 head = FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, HEAD);
1085 ack = fm10k_mbx_index_len(mbx, head, mbx->tail);
1086 mbx->pulled += mbx->tail_len - ack;
1088 /* now drop any messages which have started or finished transmitting */
1089 while (fm10k_fifo_head_len(&mbx->tx) && mbx->pulled) {
1090 len = fm10k_fifo_head_drop(&mbx->tx);
1092 if (mbx->pulled >= len)
1098 /* just do a quick resysnc to start of message */
1108 * fm10k_mbx_update_max_size - Update the max_size and drop large messages
1109 * @mbx: pointer to mailbox
1110 * @size: new value for max_size
1112 * This function updates the max_size value and drops any outgoing messages
1113 * at the head of the Tx FIFO if they are larger than max_size. It does not
1114 * drop all messages, as this is too difficult to parse and remove them from
1115 * the FIFO. Instead, rely on the checking to ensure that messages larger
1116 * than max_size aren't pushed into the memory buffer.
1118 STATIC void fm10k_mbx_update_max_size(struct fm10k_mbx_info *mbx, u16 size)
1122 DEBUGFUNC("fm10k_mbx_update_max_size_hdr");
1124 mbx->max_size = size;
1126 /* flush any oversized messages from the queue */
1127 for (len = fm10k_fifo_head_len(&mbx->tx);
1129 len = fm10k_fifo_head_len(&mbx->tx)) {
1130 fm10k_fifo_head_drop(&mbx->tx);
1136 * fm10k_mbx_connect_reset - Reset following request for reset
1137 * @mbx: pointer to mailbox
1139 * This function resets the mailbox to either a disconnected state
1140 * or a connect state depending on the current mailbox state
1142 STATIC void fm10k_mbx_connect_reset(struct fm10k_mbx_info *mbx)
1144 /* just do a quick resysnc to start of frame */
1145 fm10k_mbx_reset_work(mbx);
1147 /* reset CRC seeds */
1148 mbx->local = FM10K_MBX_CRC_SEED;
1149 mbx->remote = FM10K_MBX_CRC_SEED;
1151 /* we cannot exit connect until the size is good */
1152 if (mbx->state == FM10K_STATE_OPEN)
1153 mbx->state = FM10K_STATE_CONNECT;
1155 mbx->state = FM10K_STATE_CLOSED;
1159 * fm10k_mbx_process_connect - Process connect header
1160 * @mbx: pointer to mailbox
1161 * @msg: message array to process
1163 * This function will read an incoming connect header and reply with the
1164 * appropriate message. It will return a value indicating the number of
1165 * data DWORDs on success, or will return a negative value on failure.
1167 STATIC s32 fm10k_mbx_process_connect(struct fm10k_hw *hw,
1168 struct fm10k_mbx_info *mbx)
1170 const enum fm10k_mbx_state state = mbx->state;
1171 const u32 *hdr = &mbx->mbx_hdr;
1174 /* we will need to pull all of the fields for verification */
1175 size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE);
1176 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1179 case FM10K_STATE_DISCONNECT:
1180 case FM10K_STATE_OPEN:
1181 /* reset any in-progress work */
1182 fm10k_mbx_connect_reset(mbx);
1184 case FM10K_STATE_CONNECT:
1185 /* we cannot exit connect until the size is good */
1186 if (size > mbx->rx.size) {
1187 mbx->max_size = mbx->rx.size - 1;
1189 /* record the remote system requesting connection */
1190 mbx->state = FM10K_STATE_OPEN;
1192 fm10k_mbx_update_max_size(mbx, size);
1199 /* align our tail index to remote head index */
1202 return fm10k_mbx_create_reply(hw, mbx, head);
1206 * fm10k_mbx_process_data - Process data header
1207 * @mbx: pointer to mailbox
1209 * This function will read an incoming data header and reply with the
1210 * appropriate message. It will return a value indicating the number of
1211 * data DWORDs on success, or will return a negative value on failure.
1213 STATIC s32 fm10k_mbx_process_data(struct fm10k_hw *hw,
1214 struct fm10k_mbx_info *mbx)
1216 const u32 *hdr = &mbx->mbx_hdr;
1220 DEBUGFUNC("fm10k_mbx_process_data");
1222 /* we will need to pull all of the fields for verification */
1223 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1224 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);
1226 /* if we are in connect just update our data and go */
1227 if (mbx->state == FM10K_STATE_CONNECT) {
1229 mbx->state = FM10K_STATE_OPEN;
1232 /* abort on message size errors */
1233 err = fm10k_mbx_push_tail(hw, mbx, tail);
1237 /* verify the checksum on the incoming data */
1238 err = fm10k_mbx_verify_remote_crc(mbx);
1242 /* process messages if we have received any */
1243 fm10k_mbx_dequeue_rx(hw, mbx);
1245 return fm10k_mbx_create_reply(hw, mbx, head);
1249 * fm10k_mbx_process_disconnect - Process disconnect header
1250 * @mbx: pointer to mailbox
1252 * This function will read an incoming disconnect header and reply with the
1253 * appropriate message. It will return a value indicating the number of
1254 * data DWORDs on success, or will return a negative value on failure.
1256 STATIC s32 fm10k_mbx_process_disconnect(struct fm10k_hw *hw,
1257 struct fm10k_mbx_info *mbx)
1259 const enum fm10k_mbx_state state = mbx->state;
1260 const u32 *hdr = &mbx->mbx_hdr;
1264 /* we will need to pull the header field for verification */
1265 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1267 /* We should not be receiving disconnect if Rx is incomplete */
1269 return FM10K_MBX_ERR_TAIL;
1271 /* we have already verified mbx->head == tail so we know this is 0 */
1274 /* verify the checksum on the incoming header is correct */
1275 err = fm10k_mbx_verify_remote_crc(mbx);
1280 case FM10K_STATE_DISCONNECT:
1281 case FM10K_STATE_OPEN:
1282 /* state doesn't change if we still have work to do */
1283 if (!fm10k_mbx_tx_complete(mbx))
1286 /* verify the head indicates we completed all transmits */
1287 if (head != mbx->tail)
1288 return FM10K_MBX_ERR_HEAD;
1290 /* reset any in-progress work */
1291 fm10k_mbx_connect_reset(mbx);
1297 return fm10k_mbx_create_reply(hw, mbx, head);
1301 * fm10k_mbx_process_error - Process error header
1302 * @mbx: pointer to mailbox
1304 * This function will read an incoming error header and reply with the
1305 * appropriate message. It will return a value indicating the number of
1306 * data DWORDs on success, or will return a negative value on failure.
1308 STATIC s32 fm10k_mbx_process_error(struct fm10k_hw *hw,
1309 struct fm10k_mbx_info *mbx)
1311 const u32 *hdr = &mbx->mbx_hdr;
1314 /* we will need to pull all of the fields for verification */
1315 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1317 switch (mbx->state) {
1318 case FM10K_STATE_OPEN:
1319 case FM10K_STATE_DISCONNECT:
1320 /* flush any uncompleted work */
1321 fm10k_mbx_reset_work(mbx);
1323 /* reset CRC seeds */
1324 mbx->local = FM10K_MBX_CRC_SEED;
1325 mbx->remote = FM10K_MBX_CRC_SEED;
1327 /* reset tail index and size to prepare for reconnect */
1330 /* if open then reset max_size and go back to connect */
1331 if (mbx->state == FM10K_STATE_OPEN) {
1332 mbx->state = FM10K_STATE_CONNECT;
1336 /* send a connect message to get data flowing again */
1337 fm10k_mbx_create_connect_hdr(mbx);
1338 return FM10K_SUCCESS;
1343 return fm10k_mbx_create_reply(hw, mbx, mbx->tail);
1347 * fm10k_mbx_process - Process mailbox interrupt
1348 * @hw: pointer to hardware structure
1349 * @mbx: pointer to mailbox
1351 * This function will process incoming mailbox events and generate mailbox
1352 * replies. It will return a value indicating the number of DWORDs
1353 * transmitted excluding header on success or a negative value on error.
1355 STATIC s32 fm10k_mbx_process(struct fm10k_hw *hw,
1356 struct fm10k_mbx_info *mbx)
1360 DEBUGFUNC("fm10k_mbx_process");
1362 /* we do not read mailbox if closed */
1363 if (mbx->state == FM10K_STATE_CLOSED)
1364 return FM10K_SUCCESS;
1366 /* copy data from mailbox */
1367 err = fm10k_mbx_read(hw, mbx);
1371 /* validate type, source, and destination */
1372 err = fm10k_mbx_validate_msg_hdr(mbx);
1376 switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, TYPE)) {
1377 case FM10K_MSG_CONNECT:
1378 err = fm10k_mbx_process_connect(hw, mbx);
1380 case FM10K_MSG_DATA:
1381 err = fm10k_mbx_process_data(hw, mbx);
1383 case FM10K_MSG_DISCONNECT:
1384 err = fm10k_mbx_process_disconnect(hw, mbx);
1386 case FM10K_MSG_ERROR:
1387 err = fm10k_mbx_process_error(hw, mbx);
1390 err = FM10K_MBX_ERR_TYPE;
1395 /* notify partner of errors on our end */
1397 fm10k_mbx_create_error_msg(mbx, err);
1399 /* copy data from mailbox */
1400 fm10k_mbx_write(hw, mbx);
1406 * fm10k_mbx_disconnect - Shutdown mailbox connection
1407 * @hw: pointer to hardware structure
1408 * @mbx: pointer to mailbox
1410 * This function will shut down the mailbox. It places the mailbox first
1411 * in the disconnect state, it then allows up to a predefined timeout for
1412 * the mailbox to transition to close on its own. If this does not occur
1413 * then the mailbox will be forced into the closed state.
1415 * Any mailbox transactions not completed before calling this function
1416 * are not guaranteed to complete and may be dropped.
1418 STATIC void fm10k_mbx_disconnect(struct fm10k_hw *hw,
1419 struct fm10k_mbx_info *mbx)
1421 int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0;
1423 DEBUGFUNC("fm10k_mbx_disconnect");
1425 /* Place mbx in ready to disconnect state */
1426 mbx->state = FM10K_STATE_DISCONNECT;
1428 /* trigger interrupt to start shutdown process */
1429 FM10K_WRITE_MBX(hw, mbx->mbx_reg, FM10K_MBX_REQ |
1430 FM10K_MBX_INTERRUPT_DISABLE);
1432 usec_delay(FM10K_MBX_POLL_DELAY);
1433 mbx->ops.process(hw, mbx);
1434 timeout -= FM10K_MBX_POLL_DELAY;
1435 } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));
1437 /* in case we didn't close, just force the mailbox into shutdown and
1438 * drop all left over messages in the FIFO.
1440 fm10k_mbx_connect_reset(mbx);
1441 fm10k_fifo_drop_all(&mbx->tx);
1443 FM10K_WRITE_MBX(hw, mbx->mbmem_reg, 0);
1447 * fm10k_mbx_connect - Start mailbox connection
1448 * @hw: pointer to hardware structure
1449 * @mbx: pointer to mailbox
1451 * This function will initiate a mailbox connection. It will populate the
1452 * mailbox with a broadcast connect message and then initialize the lock.
1453 * This is safe since the connect message is a single DWORD so the mailbox
1454 * transaction is guaranteed to be atomic.
1456 * This function will return an error if the mailbox has not been initiated
1457 * or is currently in use.
1459 STATIC s32 fm10k_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
1461 DEBUGFUNC("fm10k_mbx_connect");
1463 /* we cannot connect an uninitialized mailbox */
1464 if (!mbx->rx.buffer)
1465 return FM10K_MBX_ERR_NO_SPACE;
1467 /* we cannot connect an already connected mailbox */
1468 if (mbx->state != FM10K_STATE_CLOSED)
1469 return FM10K_MBX_ERR_BUSY;
1471 /* mailbox timeout can now become active */
1472 mbx->timeout = FM10K_MBX_INIT_TIMEOUT;
1474 /* Place mbx in ready to connect state */
1475 mbx->state = FM10K_STATE_CONNECT;
1477 /* initialize header of remote mailbox */
1478 fm10k_mbx_create_disconnect_hdr(mbx);
1479 FM10K_WRITE_MBX(hw, mbx->mbmem_reg ^ mbx->mbmem_len, mbx->mbx_hdr);
1481 /* enable interrupt and notify other party of new message */
1482 mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT |
1483 FM10K_MBX_INTERRUPT_ENABLE;
1485 /* generate and load connect header into mailbox */
1486 fm10k_mbx_create_connect_hdr(mbx);
1487 fm10k_mbx_write(hw, mbx);
1489 return FM10K_SUCCESS;
1493 * fm10k_mbx_validate_handlers - Validate layout of message parsing data
1494 * @msg_data: handlers for mailbox events
1496 * This function validates the layout of the message parsing data. This
1497 * should be mostly static, but it is important to catch any errors that
1498 * are made when constructing the parsers.
1500 STATIC s32 fm10k_mbx_validate_handlers(const struct fm10k_msg_data *msg_data)
1502 const struct fm10k_tlv_attr *attr;
1505 DEBUGFUNC("fm10k_mbx_validate_handlers");
1507 /* Allow NULL mailboxes that transmit but don't receive */
1509 return FM10K_SUCCESS;
1511 while (msg_data->id != FM10K_TLV_ERROR) {
1512 /* all messages should have a function handler */
1513 if (!msg_data->func)
1514 return FM10K_ERR_PARAM;
1516 /* parser is optional */
1517 attr = msg_data->attr;
1519 while (attr->id != FM10K_TLV_ERROR) {
1522 /* ID should always be increasing */
1524 return FM10K_ERR_PARAM;
1525 /* ID should fit in results array */
1526 if (id >= FM10K_TLV_RESULTS_MAX)
1527 return FM10K_ERR_PARAM;
1530 /* verify terminator is in the list */
1531 if (attr->id != FM10K_TLV_ERROR)
1532 return FM10K_ERR_PARAM;
1537 /* ID should always be increasing */
1538 if (id >= msg_data->id)
1539 return FM10K_ERR_PARAM;
1542 /* verify terminator is in the list */
1543 if ((msg_data->id != FM10K_TLV_ERROR) || !msg_data->func)
1544 return FM10K_ERR_PARAM;
1546 return FM10K_SUCCESS;
1550 * fm10k_mbx_register_handlers - Register a set of handler ops for mailbox
1551 * @mbx: pointer to mailbox
1552 * @msg_data: handlers for mailbox events
1554 * This function associates a set of message handling ops with a mailbox.
1556 STATIC s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx,
1557 const struct fm10k_msg_data *msg_data)
1559 DEBUGFUNC("fm10k_mbx_register_handlers");
1561 /* validate layout of handlers before assigning them */
1562 if (fm10k_mbx_validate_handlers(msg_data))
1563 return FM10K_ERR_PARAM;
1565 /* initialize the message handlers */
1566 mbx->msg_data = msg_data;
1568 return FM10K_SUCCESS;
1572 * fm10k_pfvf_mbx_init - Initialize mailbox memory for PF/VF mailbox
1573 * @hw: pointer to hardware structure
1574 * @mbx: pointer to mailbox
1575 * @msg_data: handlers for mailbox events
1576 * @id: ID reference for PF as it supports up to 64 PF/VF mailboxes
1578 * This function initializes the mailbox for use. It will split the
1579 * buffer provided an use that th populate both the Tx and Rx FIFO by
1580 * evenly splitting it. In order to allow for easy masking of head/tail
1581 * the value reported in size must be a power of 2 and is reported in
1582 * DWORDs, not bytes. Any invalid values will cause the mailbox to return
1585 s32 fm10k_pfvf_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx,
1586 const struct fm10k_msg_data *msg_data, u8 id)
1588 DEBUGFUNC("fm10k_pfvf_mbx_init");
1590 /* initialize registers */
1591 switch (hw->mac.type) {
1593 mbx->mbx_reg = FM10K_VFMBX;
1594 mbx->mbmem_reg = FM10K_VFMBMEM(FM10K_VFMBMEM_VF_XOR);
1597 /* there are only 64 VF <-> PF mailboxes */
1599 mbx->mbx_reg = FM10K_MBX(id);
1600 mbx->mbmem_reg = FM10K_MBMEM_VF(id, 0);
1605 return FM10K_MBX_ERR_NO_MBX;
1608 /* start out in closed state */
1609 mbx->state = FM10K_STATE_CLOSED;
1611 /* validate layout of handlers before assigning them */
1612 if (fm10k_mbx_validate_handlers(msg_data))
1613 return FM10K_ERR_PARAM;
1615 /* initialize the message handlers */
1616 mbx->msg_data = msg_data;
1618 /* start mailbox as timed out and let the reset_hw call
1619 * set the timeout value to begin communications
1622 mbx->usec_delay = FM10K_MBX_INIT_DELAY;
1624 /* initialize tail and head */
1628 /* initialize CRC seeds */
1629 mbx->local = FM10K_MBX_CRC_SEED;
1630 mbx->remote = FM10K_MBX_CRC_SEED;
1632 /* Split buffer for use by Tx/Rx FIFOs */
1633 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
1634 mbx->mbmem_len = FM10K_VFMBMEM_VF_XOR;
1636 /* initialize the FIFOs, sizes are in 4 byte increments */
1637 fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE);
1638 fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE],
1639 FM10K_MBX_RX_BUFFER_SIZE);
1641 /* initialize function pointers */
1642 mbx->ops.connect = fm10k_mbx_connect;
1643 mbx->ops.disconnect = fm10k_mbx_disconnect;
1644 mbx->ops.rx_ready = fm10k_mbx_rx_ready;
1645 mbx->ops.tx_ready = fm10k_mbx_tx_ready;
1646 mbx->ops.tx_complete = fm10k_mbx_tx_complete;
1647 mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx;
1648 mbx->ops.process = fm10k_mbx_process;
1649 mbx->ops.register_handlers = fm10k_mbx_register_handlers;
1651 return FM10K_SUCCESS;
1655 * fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO
1656 * @mbx: pointer to mailbox
1658 * This function returns a connection mailbox header
1660 STATIC void fm10k_sm_mbx_create_data_hdr(struct fm10k_mbx_info *mbx)
1663 mbx->mbx_lock |= FM10K_MBX_REQ;
1665 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) |
1666 FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) |
1667 FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD);
1671 * fm10k_sm_mbx_create_connect_hdr - Generate a mailbox header for local FIFO
1672 * @mbx: pointer to mailbox
1673 * @err: error flags to report if any
1675 * This function returns a connection mailbox header
1677 STATIC void fm10k_sm_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx, u8 err)
1680 mbx->mbx_lock |= FM10K_MBX_REQ;
1682 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) |
1683 FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) |
1684 FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD) |
1685 FM10K_MSG_HDR_FIELD_SET(err, SM_ERR);
1689 * fm10k_sm_mbx_connect_reset - Reset following request for reset
1690 * @mbx: pointer to mailbox
1692 * This function resets the mailbox to a just connected state
1694 STATIC void fm10k_sm_mbx_connect_reset(struct fm10k_mbx_info *mbx)
1696 /* flush any uncompleted work */
1697 fm10k_mbx_reset_work(mbx);
1699 /* set local version to max and remote version to 0 */
1700 mbx->local = FM10K_SM_MBX_VERSION;
1703 /* initialize tail and head */
1707 /* reset state back to connect */
1708 mbx->state = FM10K_STATE_CONNECT;
1712 * fm10k_sm_mbx_connect - Start switch manager mailbox connection
1713 * @hw: pointer to hardware structure
1714 * @mbx: pointer to mailbox
1716 * This function will initiate a mailbox connection with the switch
1717 * manager. To do this it will first disconnect the mailbox, and then
1718 * reconnect it in order to complete a reset of the mailbox.
1720 * This function will return an error if the mailbox has not been initiated
1721 * or is currently in use.
1723 STATIC s32 fm10k_sm_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
1725 DEBUGFUNC("fm10k_mbx_connect");
1727 /* we cannot connect an uninitialized mailbox */
1728 if (!mbx->rx.buffer)
1729 return FM10K_MBX_ERR_NO_SPACE;
1731 /* we cannot connect an already connected mailbox */
1732 if (mbx->state != FM10K_STATE_CLOSED)
1733 return FM10K_MBX_ERR_BUSY;
1735 /* mailbox timeout can now become active */
1736 mbx->timeout = FM10K_MBX_INIT_TIMEOUT;
1738 /* Place mbx in ready to connect state */
1739 mbx->state = FM10K_STATE_CONNECT;
1740 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
1742 /* reset interface back to connect */
1743 fm10k_sm_mbx_connect_reset(mbx);
1745 /* enable interrupt and notify other party of new message */
1746 mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT |
1747 FM10K_MBX_INTERRUPT_ENABLE;
1749 /* generate and load connect header into mailbox */
1750 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
1751 fm10k_mbx_write(hw, mbx);
1753 /* enable interrupt and notify other party of new message */
1755 return FM10K_SUCCESS;
1759 * fm10k_sm_mbx_disconnect - Shutdown mailbox connection
1760 * @hw: pointer to hardware structure
1761 * @mbx: pointer to mailbox
1763 * This function will shut down the mailbox. It places the mailbox first
1764 * in the disconnect state, it then allows up to a predefined timeout for
1765 * the mailbox to transition to close on its own. If this does not occur
1766 * then the mailbox will be forced into the closed state.
1768 * Any mailbox transactions not completed before calling this function
1769 * are not guaranteed to complete and may be dropped.
1771 STATIC void fm10k_sm_mbx_disconnect(struct fm10k_hw *hw,
1772 struct fm10k_mbx_info *mbx)
1774 int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0;
1776 DEBUGFUNC("fm10k_sm_mbx_disconnect");
1778 /* Place mbx in ready to disconnect state */
1779 mbx->state = FM10K_STATE_DISCONNECT;
1781 /* trigger interrupt to start shutdown process */
1782 FM10K_WRITE_REG(hw, mbx->mbx_reg, FM10K_MBX_REQ |
1783 FM10K_MBX_INTERRUPT_DISABLE);
1785 usec_delay(FM10K_MBX_POLL_DELAY);
1786 mbx->ops.process(hw, mbx);
1787 timeout -= FM10K_MBX_POLL_DELAY;
1788 } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));
1790 /* in case we didn't close just force the mailbox into shutdown */
1791 mbx->state = FM10K_STATE_CLOSED;
1793 fm10k_mbx_reset_work(mbx);
1794 fm10k_fifo_drop_all(&mbx->tx);
1796 FM10K_WRITE_REG(hw, mbx->mbmem_reg, 0);
1800 * fm10k_mbx_validate_fifo_hdr - Validate fields in the remote FIFO header
1801 * @mbx: pointer to mailbox
1803 * This function will parse up the fields in the mailbox header and return
1804 * an error if the header contains any of a number of invalid configurations
1805 * including unrecognized offsets or version numbers.
1807 STATIC s32 fm10k_sm_mbx_validate_fifo_hdr(struct fm10k_mbx_info *mbx)
1809 const u32 *hdr = &mbx->mbx_hdr;
1810 u16 tail, head, ver;
1812 DEBUGFUNC("fm10k_mbx_validate_msg_hdr");
1814 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL);
1815 ver = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_VER);
1816 head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD);
1821 case FM10K_SM_MBX_VERSION:
1822 if (!head || head > FM10K_SM_MBX_FIFO_LEN)
1823 return FM10K_MBX_ERR_HEAD;
1824 if (!tail || tail > FM10K_SM_MBX_FIFO_LEN)
1825 return FM10K_MBX_ERR_TAIL;
1826 if (mbx->tail < head)
1827 head += mbx->mbmem_len - 1;
1828 if (tail < mbx->head)
1829 tail += mbx->mbmem_len - 1;
1830 if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len)
1831 return FM10K_MBX_ERR_HEAD;
1832 if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len)
1834 return FM10K_MBX_ERR_TAIL;
1836 return FM10K_MBX_ERR_SRC;
1839 return FM10K_SUCCESS;
1843 * fm10k_sm_mbx_process_error - Process header with error flag set
1844 * @mbx: pointer to mailbox
1846 * This function is meant to respond to a request where the error flag
1847 * is set. As a result we will terminate a connection if one is present
1848 * and fall back into the reset state with a connection header of version
1851 STATIC void fm10k_sm_mbx_process_error(struct fm10k_mbx_info *mbx)
1853 const enum fm10k_mbx_state state = mbx->state;
1856 case FM10K_STATE_DISCONNECT:
1857 /* if there is an error just disconnect */
1860 case FM10K_STATE_OPEN:
1861 /* flush any uncompleted work */
1862 fm10k_sm_mbx_connect_reset(mbx);
1864 case FM10K_STATE_CONNECT:
1865 /* try connnecting at lower version */
1867 while (mbx->local > 1)
1876 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
1880 * fm10k_sm_mbx_create_error_message - Process an error in FIFO hdr
1881 * @mbx: pointer to mailbox
1882 * @err: local error encountered
1884 * This function will interpret the error provided by err, and based on
1885 * that it may set the error bit in the local message header
1887 STATIC void fm10k_sm_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err)
1889 /* only generate an error message for these types */
1891 case FM10K_MBX_ERR_TAIL:
1892 case FM10K_MBX_ERR_HEAD:
1893 case FM10K_MBX_ERR_SRC:
1894 case FM10K_MBX_ERR_SIZE:
1895 case FM10K_MBX_ERR_RSVD0:
1901 /* process it as though we received an error, and send error reply */
1902 fm10k_sm_mbx_process_error(mbx);
1903 fm10k_sm_mbx_create_connect_hdr(mbx, 1);
1907 * fm10k_sm_mbx_receive - Take message from Rx mailbox FIFO and put it in Rx
1908 * @hw: pointer to hardware structure
1909 * @mbx: pointer to mailbox
1911 * This function will dequeue one message from the Rx switch manager mailbox
1912 * FIFO and place it in the Rx mailbox FIFO for processing by software.
1914 STATIC s32 fm10k_sm_mbx_receive(struct fm10k_hw *hw,
1915 struct fm10k_mbx_info *mbx,
1918 /* reduce length by 1 to convert to a mask */
1919 u16 mbmem_len = mbx->mbmem_len - 1;
1922 DEBUGFUNC("fm10k_sm_mbx_receive");
1924 /* push tail in front of head */
1925 if (tail < mbx->head)
1928 /* copy data to the Rx FIFO */
1929 err = fm10k_mbx_push_tail(hw, mbx, tail);
1933 /* process messages if we have received any */
1934 fm10k_mbx_dequeue_rx(hw, mbx);
1936 /* guarantee head aligns with the end of the last message */
1937 mbx->head = fm10k_mbx_head_sub(mbx, mbx->pushed);
1940 /* clear any extra bits left over since index adds 1 extra bit */
1941 if (mbx->head > mbmem_len)
1942 mbx->head -= mbmem_len;
1948 * fm10k_sm_mbx_transmit - Take message from Tx and put it in Tx mailbox FIFO
1949 * @hw: pointer to hardware structure
1950 * @mbx: pointer to mailbox
1952 * This function will dequeue one message from the Tx mailbox FIFO and place
1953 * it in the Tx switch manager mailbox FIFO for processing by hardware.
1955 STATIC void fm10k_sm_mbx_transmit(struct fm10k_hw *hw,
1956 struct fm10k_mbx_info *mbx, u16 head)
1958 struct fm10k_mbx_fifo *fifo = &mbx->tx;
1959 /* reduce length by 1 to convert to a mask */
1960 u16 mbmem_len = mbx->mbmem_len - 1;
1961 u16 tail_len, len = 0;
1964 DEBUGFUNC("fm10k_sm_mbx_transmit");
1966 /* push head behind tail */
1967 if (mbx->tail < head)
1970 fm10k_mbx_pull_head(hw, mbx, head);
1972 /* determine msg aligned offset for end of buffer */
1974 msg = fifo->buffer + fm10k_fifo_head_offset(fifo, len);
1976 len += FM10K_TLV_DWORD_LEN(*msg);
1977 } while ((len <= mbx->tail_len) && (len < mbmem_len));
1979 /* guarantee we stop on a message boundary */
1980 if (mbx->tail_len > tail_len) {
1981 mbx->tail = fm10k_mbx_tail_sub(mbx, mbx->tail_len - tail_len);
1982 mbx->tail_len = tail_len;
1985 /* clear any extra bits left over since index adds 1 extra bit */
1986 if (mbx->tail > mbmem_len)
1987 mbx->tail -= mbmem_len;
1991 * fm10k_sm_mbx_create_reply - Generate reply based on state and remote head
1992 * @mbx: pointer to mailbox
1993 * @head: acknowledgement number
1995 * This function will generate an outgoing message based on the current
1996 * mailbox state and the remote fifo head. It will return the length
1997 * of the outgoing message excluding header on success, and a negative value
2000 STATIC void fm10k_sm_mbx_create_reply(struct fm10k_hw *hw,
2001 struct fm10k_mbx_info *mbx, u16 head)
2003 switch (mbx->state) {
2004 case FM10K_STATE_OPEN:
2005 case FM10K_STATE_DISCONNECT:
2006 /* flush out Tx data */
2007 fm10k_sm_mbx_transmit(hw, mbx, head);
2009 /* generate new header based on data */
2010 if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) {
2011 fm10k_sm_mbx_create_data_hdr(mbx);
2014 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
2017 case FM10K_STATE_CONNECT:
2018 case FM10K_STATE_CLOSED:
2019 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
2027 * fm10k_sm_mbx_process_reset - Process header with version == 0 (RESET)
2028 * @hw: pointer to hardware structure
2029 * @mbx: pointer to mailbox
2031 * This function is meant to respond to a request where the version data
2032 * is set to 0. As such we will either terminate the connection or go
2033 * into the connect state in order to re-establish the connection. This
2034 * function can also be used to respond to an error as the connection
2035 * resetting would also be a means of dealing with errors.
2037 STATIC void fm10k_sm_mbx_process_reset(struct fm10k_hw *hw,
2038 struct fm10k_mbx_info *mbx)
2040 const enum fm10k_mbx_state state = mbx->state;
2043 case FM10K_STATE_DISCONNECT:
2044 /* drop remote connections and disconnect */
2045 mbx->state = FM10K_STATE_CLOSED;
2049 case FM10K_STATE_OPEN:
2050 /* flush any incomplete work */
2051 fm10k_sm_mbx_connect_reset(mbx);
2053 case FM10K_STATE_CONNECT:
2054 /* Update remote value to match local value */
2055 mbx->remote = mbx->local;
2060 fm10k_sm_mbx_create_reply(hw, mbx, mbx->tail);
2064 * fm10k_sm_mbx_process_version_1 - Process header with version == 1
2065 * @hw: pointer to hardware structure
2066 * @mbx: pointer to mailbox
2068 * This function is meant to process messages received when the remote
2069 * mailbox is active.
2071 STATIC s32 fm10k_sm_mbx_process_version_1(struct fm10k_hw *hw,
2072 struct fm10k_mbx_info *mbx)
2074 const u32 *hdr = &mbx->mbx_hdr;
2078 /* pull all fields needed for verification */
2079 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL);
2080 head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD);
2082 /* if we are in connect and wanting version 1 then start up and go */
2083 if (mbx->state == FM10K_STATE_CONNECT) {
2086 if (mbx->remote != 1)
2087 return FM10K_MBX_ERR_SRC;
2089 mbx->state = FM10K_STATE_OPEN;
2093 /* abort on message size errors */
2094 len = fm10k_sm_mbx_receive(hw, mbx, tail);
2098 /* continue until we have flushed the Rx FIFO */
2102 fm10k_sm_mbx_create_reply(hw, mbx, head);
2104 return FM10K_SUCCESS;
2108 * fm10k_sm_mbx_process - Process mailbox switch mailbox interrupt
2109 * @hw: pointer to hardware structure
2110 * @mbx: pointer to mailbox
2112 * This function will process incoming mailbox events and generate mailbox
2113 * replies. It will return a value indicating the number of DWORDs
2114 * transmitted excluding header on success or a negative value on error.
2116 STATIC s32 fm10k_sm_mbx_process(struct fm10k_hw *hw,
2117 struct fm10k_mbx_info *mbx)
2121 DEBUGFUNC("fm10k_sm_mbx_process");
2123 /* we do not read mailbox if closed */
2124 if (mbx->state == FM10K_STATE_CLOSED)
2125 return FM10K_SUCCESS;
2127 /* retrieve data from switch manager */
2128 err = fm10k_mbx_read(hw, mbx);
2132 err = fm10k_sm_mbx_validate_fifo_hdr(mbx);
2136 if (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_ERR)) {
2137 fm10k_sm_mbx_process_error(mbx);
2141 switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_VER)) {
2143 fm10k_sm_mbx_process_reset(hw, mbx);
2145 case FM10K_SM_MBX_VERSION:
2146 err = fm10k_sm_mbx_process_version_1(hw, mbx);
2152 fm10k_sm_mbx_create_error_msg(mbx, err);
2154 /* report data to switch manager */
2155 fm10k_mbx_write(hw, mbx);
2161 * fm10k_sm_mbx_init - Initialize mailbox memory for PF/SM mailbox
2162 * @hw: pointer to hardware structure
2163 * @mbx: pointer to mailbox
2164 * @msg_data: handlers for mailbox events
2166 * This function for now is used to stub out the PF/SM mailbox
2168 s32 fm10k_sm_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx,
2169 const struct fm10k_msg_data *msg_data)
2171 DEBUGFUNC("fm10k_sm_mbx_init");
2172 UNREFERENCED_1PARAMETER(hw);
2174 mbx->mbx_reg = FM10K_GMBX;
2175 mbx->mbmem_reg = FM10K_MBMEM_PF(0);
2177 /* start out in closed state */
2178 mbx->state = FM10K_STATE_CLOSED;
2180 /* validate layout of handlers before assigning them */
2181 if (fm10k_mbx_validate_handlers(msg_data))
2182 return FM10K_ERR_PARAM;
2184 /* initialize the message handlers */
2185 mbx->msg_data = msg_data;
2187 /* start mailbox as timed out and let the reset_hw call
2188 * set the timeout value to begin communications
2191 mbx->usec_delay = FM10K_MBX_INIT_DELAY;
2193 /* Split buffer for use by Tx/Rx FIFOs */
2194 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
2195 mbx->mbmem_len = FM10K_MBMEM_PF_XOR;
2197 /* initialize the FIFOs, sizes are in 4 byte increments */
2198 fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE);
2199 fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE],
2200 FM10K_MBX_RX_BUFFER_SIZE);
2202 /* initialize function pointers */
2203 mbx->ops.connect = fm10k_sm_mbx_connect;
2204 mbx->ops.disconnect = fm10k_sm_mbx_disconnect;
2205 mbx->ops.rx_ready = fm10k_mbx_rx_ready;
2206 mbx->ops.tx_ready = fm10k_mbx_tx_ready;
2207 mbx->ops.tx_complete = fm10k_mbx_tx_complete;
2208 mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx;
2209 mbx->ops.process = fm10k_sm_mbx_process;
2210 mbx->ops.register_handlers = fm10k_mbx_register_handlers;
2212 return FM10K_SUCCESS;