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:
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13 notice, this list of conditions and the following disclaimer in the
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21 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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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,
146 * and 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->rx.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)
1078 /* reset our outgoing max size back to Rx limits */
1079 mbx->max_size = mbx->rx.size - 1;
1081 /* just do a quick resysnc to start of message */
1091 * fm10k_mbx_update_max_size - Update the max_size and drop any large messages
1092 * @mbx: pointer to mailbox
1093 * @size: new value for max_size
1095 * This function will update the max_size value and drop any outgoing messages
1096 * from the head of the Tx FIFO that are larger than max_size.
1098 STATIC void fm10k_mbx_update_max_size(struct fm10k_mbx_info *mbx, u16 size)
1102 DEBUGFUNC("fm10k_mbx_update_max_size_hdr");
1104 mbx->max_size = size;
1106 /* flush any oversized messages from the queue */
1107 for (len = fm10k_fifo_head_len(&mbx->tx);
1109 len = fm10k_fifo_head_len(&mbx->tx)) {
1110 fm10k_fifo_head_drop(&mbx->tx);
1116 * fm10k_mbx_connect_reset - Reset following request for reset
1117 * @mbx: pointer to mailbox
1119 * This function resets the mailbox to either a disconnected state
1120 * or a connect state depending on the current mailbox state
1122 STATIC void fm10k_mbx_connect_reset(struct fm10k_mbx_info *mbx)
1124 /* just do a quick resysnc to start of frame */
1125 fm10k_mbx_reset_work(mbx);
1127 /* reset CRC seeds */
1128 mbx->local = FM10K_MBX_CRC_SEED;
1129 mbx->remote = FM10K_MBX_CRC_SEED;
1131 /* we cannot exit connect until the size is good */
1132 if (mbx->state == FM10K_STATE_OPEN)
1133 mbx->state = FM10K_STATE_CONNECT;
1135 mbx->state = FM10K_STATE_CLOSED;
1139 * fm10k_mbx_process_connect - Process connect header
1140 * @mbx: pointer to mailbox
1141 * @msg: message array to process
1143 * This function will read an incoming connect header and reply with the
1144 * appropriate message. It will return a value indicating the number of
1145 * data DWORDs on success, or will return a negative value on failure.
1147 STATIC s32 fm10k_mbx_process_connect(struct fm10k_hw *hw,
1148 struct fm10k_mbx_info *mbx)
1150 const enum fm10k_mbx_state state = mbx->state;
1151 const u32 *hdr = &mbx->mbx_hdr;
1154 /* we will need to pull all of the fields for verification */
1155 size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE);
1156 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1159 case FM10K_STATE_DISCONNECT:
1160 case FM10K_STATE_OPEN:
1161 /* reset any in-progress work */
1162 fm10k_mbx_connect_reset(mbx);
1164 case FM10K_STATE_CONNECT:
1165 /* we cannot exit connect until the size is good */
1166 if (size > mbx->rx.size) {
1167 mbx->max_size = mbx->rx.size - 1;
1169 /* record the remote system requesting connection */
1170 mbx->state = FM10K_STATE_OPEN;
1172 fm10k_mbx_update_max_size(mbx, size);
1179 /* align our tail index to remote head index */
1182 return fm10k_mbx_create_reply(hw, mbx, head);
1186 * fm10k_mbx_process_data - Process data header
1187 * @mbx: pointer to mailbox
1189 * This function will read an incoming data header and reply with the
1190 * appropriate message. It will return a value indicating the number of
1191 * data DWORDs on success, or will return a negative value on failure.
1193 STATIC s32 fm10k_mbx_process_data(struct fm10k_hw *hw,
1194 struct fm10k_mbx_info *mbx)
1196 const u32 *hdr = &mbx->mbx_hdr;
1200 DEBUGFUNC("fm10k_mbx_process_data");
1202 /* we will need to pull all of the fields for verification */
1203 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1204 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL);
1206 /* if we are in connect just update our data and go */
1207 if (mbx->state == FM10K_STATE_CONNECT) {
1209 mbx->state = FM10K_STATE_OPEN;
1212 /* abort on message size errors */
1213 err = fm10k_mbx_push_tail(hw, mbx, tail);
1217 /* verify the checksum on the incoming data */
1218 err = fm10k_mbx_verify_remote_crc(mbx);
1222 /* process messages if we have received any */
1223 fm10k_mbx_dequeue_rx(hw, mbx);
1225 return fm10k_mbx_create_reply(hw, mbx, head);
1229 * fm10k_mbx_process_disconnect - Process disconnect header
1230 * @mbx: pointer to mailbox
1232 * This function will read an incoming disconnect header and reply with the
1233 * appropriate message. It will return a value indicating the number of
1234 * data DWORDs on success, or will return a negative value on failure.
1236 STATIC s32 fm10k_mbx_process_disconnect(struct fm10k_hw *hw,
1237 struct fm10k_mbx_info *mbx)
1239 const enum fm10k_mbx_state state = mbx->state;
1240 const u32 *hdr = &mbx->mbx_hdr;
1244 /* we will need to pull the header field for verification */
1245 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1247 /* We should not be receiving disconnect if Rx is incomplete */
1249 return FM10K_MBX_ERR_TAIL;
1251 /* we have already verified mbx->head == tail so we know this is 0 */
1254 /* verify the checksum on the incoming header is correct */
1255 err = fm10k_mbx_verify_remote_crc(mbx);
1260 case FM10K_STATE_DISCONNECT:
1261 case FM10K_STATE_OPEN:
1262 /* state doesn't change if we still have work to do */
1263 if (!fm10k_mbx_tx_complete(mbx))
1266 /* verify the head indicates we completed all transmits */
1267 if (head != mbx->tail)
1268 return FM10K_MBX_ERR_HEAD;
1270 /* reset any in-progress work */
1271 fm10k_mbx_connect_reset(mbx);
1277 return fm10k_mbx_create_reply(hw, mbx, head);
1281 * fm10k_mbx_process_error - Process error header
1282 * @mbx: pointer to mailbox
1284 * This function will read an incoming error header and reply with the
1285 * appropriate message. It will return a value indicating the number of
1286 * data DWORDs on success, or will return a negative value on failure.
1288 STATIC s32 fm10k_mbx_process_error(struct fm10k_hw *hw,
1289 struct fm10k_mbx_info *mbx)
1291 const u32 *hdr = &mbx->mbx_hdr;
1294 /* we will need to pull all of the fields for verification */
1295 head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD);
1297 switch (mbx->state) {
1298 case FM10K_STATE_OPEN:
1299 case FM10K_STATE_DISCONNECT:
1300 /* flush any uncompleted work */
1301 fm10k_mbx_reset_work(mbx);
1303 /* reset CRC seeds */
1304 mbx->local = FM10K_MBX_CRC_SEED;
1305 mbx->remote = FM10K_MBX_CRC_SEED;
1307 /* reset tail index and size to prepare for reconnect */
1310 /* if open then reset max_size and go back to connect */
1311 if (mbx->state == FM10K_STATE_OPEN) {
1312 mbx->state = FM10K_STATE_CONNECT;
1316 /* send a connect message to get data flowing again */
1317 fm10k_mbx_create_connect_hdr(mbx);
1318 return FM10K_SUCCESS;
1323 return fm10k_mbx_create_reply(hw, mbx, mbx->tail);
1327 * fm10k_mbx_process - Process mailbox interrupt
1328 * @hw: pointer to hardware structure
1329 * @mbx: pointer to mailbox
1331 * This function will process incoming mailbox events and generate mailbox
1332 * replies. It will return a value indicating the number of DWORDs
1333 * transmitted excluding header on success or a negative value on error.
1335 STATIC s32 fm10k_mbx_process(struct fm10k_hw *hw,
1336 struct fm10k_mbx_info *mbx)
1340 DEBUGFUNC("fm10k_mbx_process");
1342 /* we do not read mailbox if closed */
1343 if (mbx->state == FM10K_STATE_CLOSED)
1344 return FM10K_SUCCESS;
1346 /* copy data from mailbox */
1347 err = fm10k_mbx_read(hw, mbx);
1351 /* validate type, source, and destination */
1352 err = fm10k_mbx_validate_msg_hdr(mbx);
1356 switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, TYPE)) {
1357 case FM10K_MSG_CONNECT:
1358 err = fm10k_mbx_process_connect(hw, mbx);
1360 case FM10K_MSG_DATA:
1361 err = fm10k_mbx_process_data(hw, mbx);
1363 case FM10K_MSG_DISCONNECT:
1364 err = fm10k_mbx_process_disconnect(hw, mbx);
1366 case FM10K_MSG_ERROR:
1367 err = fm10k_mbx_process_error(hw, mbx);
1370 err = FM10K_MBX_ERR_TYPE;
1375 /* notify partner of errors on our end */
1377 fm10k_mbx_create_error_msg(mbx, err);
1379 /* copy data from mailbox */
1380 fm10k_mbx_write(hw, mbx);
1386 * fm10k_mbx_disconnect - Shutdown mailbox connection
1387 * @hw: pointer to hardware structure
1388 * @mbx: pointer to mailbox
1390 * This function will shut down the mailbox. It places the mailbox first
1391 * in the disconnect state, it then allows up to a predefined timeout for
1392 * the mailbox to transition to close on its own. If this does not occur
1393 * then the mailbox will be forced into the closed state.
1395 * Any mailbox transactions not completed before calling this function
1396 * are not guaranteed to complete and may be dropped.
1398 STATIC void fm10k_mbx_disconnect(struct fm10k_hw *hw,
1399 struct fm10k_mbx_info *mbx)
1401 int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0;
1403 DEBUGFUNC("fm10k_mbx_disconnect");
1405 /* Place mbx in ready to disconnect state */
1406 mbx->state = FM10K_STATE_DISCONNECT;
1408 /* trigger interrupt to start shutdown process */
1409 FM10K_WRITE_MBX(hw, mbx->mbx_reg, FM10K_MBX_REQ |
1410 FM10K_MBX_INTERRUPT_DISABLE);
1412 usec_delay(FM10K_MBX_POLL_DELAY);
1413 mbx->ops.process(hw, mbx);
1414 timeout -= FM10K_MBX_POLL_DELAY;
1415 } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));
1417 /* in case we didn't close, just force the mailbox into shutdown and
1418 * drop all left over messages in the FIFO.
1420 fm10k_mbx_connect_reset(mbx);
1421 fm10k_fifo_drop_all(&mbx->tx);
1423 FM10K_WRITE_MBX(hw, mbx->mbmem_reg, 0);
1427 * fm10k_mbx_connect - Start mailbox connection
1428 * @hw: pointer to hardware structure
1429 * @mbx: pointer to mailbox
1431 * This function will initiate a mailbox connection. It will populate the
1432 * mailbox with a broadcast connect message and then initialize the lock.
1433 * This is safe since the connect message is a single DWORD so the mailbox
1434 * transaction is guaranteed to be atomic.
1436 * This function will return an error if the mailbox has not been initiated
1437 * or is currently in use.
1439 STATIC s32 fm10k_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
1441 DEBUGFUNC("fm10k_mbx_connect");
1443 /* we cannot connect an uninitialized mailbox */
1444 if (!mbx->rx.buffer)
1445 return FM10K_MBX_ERR_NO_SPACE;
1447 /* we cannot connect an already connected mailbox */
1448 if (mbx->state != FM10K_STATE_CLOSED)
1449 return FM10K_MBX_ERR_BUSY;
1451 /* mailbox timeout can now become active */
1452 mbx->timeout = FM10K_MBX_INIT_TIMEOUT;
1454 /* Place mbx in ready to connect state */
1455 mbx->state = FM10K_STATE_CONNECT;
1457 /* initialize header of remote mailbox */
1458 fm10k_mbx_create_disconnect_hdr(mbx);
1459 FM10K_WRITE_MBX(hw, mbx->mbmem_reg ^ mbx->mbmem_len, mbx->mbx_hdr);
1461 /* enable interrupt and notify other party of new message */
1462 mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT |
1463 FM10K_MBX_INTERRUPT_ENABLE;
1465 /* generate and load connect header into mailbox */
1466 fm10k_mbx_create_connect_hdr(mbx);
1467 fm10k_mbx_write(hw, mbx);
1469 return FM10K_SUCCESS;
1473 * fm10k_mbx_validate_handlers - Validate layout of message parsing data
1474 * @msg_data: handlers for mailbox events
1476 * This function validates the layout of the message parsing data. This
1477 * should be mostly static, but it is important to catch any errors that
1478 * are made when constructing the parsers.
1480 STATIC s32 fm10k_mbx_validate_handlers(const struct fm10k_msg_data *msg_data)
1482 const struct fm10k_tlv_attr *attr;
1485 DEBUGFUNC("fm10k_mbx_validate_handlers");
1487 /* Allow NULL mailboxes that transmit but don't receive */
1489 return FM10K_SUCCESS;
1491 while (msg_data->id != FM10K_TLV_ERROR) {
1492 /* all messages should have a function handler */
1493 if (!msg_data->func)
1494 return FM10K_ERR_PARAM;
1496 /* parser is optional */
1497 attr = msg_data->attr;
1499 while (attr->id != FM10K_TLV_ERROR) {
1502 /* ID should always be increasing */
1504 return FM10K_ERR_PARAM;
1505 /* ID should fit in results array */
1506 if (id >= FM10K_TLV_RESULTS_MAX)
1507 return FM10K_ERR_PARAM;
1510 /* verify terminator is in the list */
1511 if (attr->id != FM10K_TLV_ERROR)
1512 return FM10K_ERR_PARAM;
1517 /* ID should always be increasing */
1518 if (id >= msg_data->id)
1519 return FM10K_ERR_PARAM;
1522 /* verify terminator is in the list */
1523 if ((msg_data->id != FM10K_TLV_ERROR) || !msg_data->func)
1524 return FM10K_ERR_PARAM;
1526 return FM10K_SUCCESS;
1530 * fm10k_mbx_register_handlers - Register a set of handler ops for mailbox
1531 * @mbx: pointer to mailbox
1532 * @msg_data: handlers for mailbox events
1534 * This function associates a set of message handling ops with a mailbox.
1536 STATIC s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx,
1537 const struct fm10k_msg_data *msg_data)
1539 DEBUGFUNC("fm10k_mbx_register_handlers");
1541 /* validate layout of handlers before assigning them */
1542 if (fm10k_mbx_validate_handlers(msg_data))
1543 return FM10K_ERR_PARAM;
1545 /* initialize the message handlers */
1546 mbx->msg_data = msg_data;
1548 return FM10K_SUCCESS;
1552 * fm10k_pfvf_mbx_init - Initialize mailbox memory for PF/VF mailbox
1553 * @hw: pointer to hardware structure
1554 * @mbx: pointer to mailbox
1555 * @msg_data: handlers for mailbox events
1556 * @id: ID reference for PF as it supports up to 64 PF/VF mailboxes
1558 * This function initializes the mailbox for use. It will split the
1559 * buffer provided an use that th populate both the Tx and Rx FIFO by
1560 * evenly splitting it. In order to allow for easy masking of head/tail
1561 * the value reported in size must be a power of 2 and is reported in
1562 * DWORDs, not bytes. Any invalid values will cause the mailbox to return
1565 s32 fm10k_pfvf_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx,
1566 const struct fm10k_msg_data *msg_data, u8 id)
1568 DEBUGFUNC("fm10k_pfvf_mbx_init");
1570 /* initialize registers */
1571 switch (hw->mac.type) {
1573 mbx->mbx_reg = FM10K_VFMBX;
1574 mbx->mbmem_reg = FM10K_VFMBMEM(FM10K_VFMBMEM_VF_XOR);
1577 /* there are only 64 VF <-> PF mailboxes */
1579 mbx->mbx_reg = FM10K_MBX(id);
1580 mbx->mbmem_reg = FM10K_MBMEM_VF(id, 0);
1585 return FM10K_MBX_ERR_NO_MBX;
1588 /* start out in closed state */
1589 mbx->state = FM10K_STATE_CLOSED;
1591 /* validate layout of handlers before assigning them */
1592 if (fm10k_mbx_validate_handlers(msg_data))
1593 return FM10K_ERR_PARAM;
1595 /* initialize the message handlers */
1596 mbx->msg_data = msg_data;
1598 /* start mailbox as timed out and let the reset_hw call
1599 * set the timeout value to begin communications
1602 mbx->usec_delay = FM10K_MBX_INIT_DELAY;
1604 /* initialize tail and head */
1608 /* initialize CRC seeds */
1609 mbx->local = FM10K_MBX_CRC_SEED;
1610 mbx->remote = FM10K_MBX_CRC_SEED;
1612 /* Split buffer for use by Tx/Rx FIFOs */
1613 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
1614 mbx->mbmem_len = FM10K_VFMBMEM_VF_XOR;
1616 /* initialize the FIFOs, sizes are in 4 byte increments */
1617 fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE);
1618 fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE],
1619 FM10K_MBX_RX_BUFFER_SIZE);
1621 /* initialize function pointers */
1622 mbx->ops.connect = fm10k_mbx_connect;
1623 mbx->ops.disconnect = fm10k_mbx_disconnect;
1624 mbx->ops.rx_ready = fm10k_mbx_rx_ready;
1625 mbx->ops.tx_ready = fm10k_mbx_tx_ready;
1626 mbx->ops.tx_complete = fm10k_mbx_tx_complete;
1627 mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx;
1628 mbx->ops.process = fm10k_mbx_process;
1629 mbx->ops.register_handlers = fm10k_mbx_register_handlers;
1631 return FM10K_SUCCESS;
1635 * fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO
1636 * @mbx: pointer to mailbox
1638 * This function returns a connection mailbox header
1640 STATIC void fm10k_sm_mbx_create_data_hdr(struct fm10k_mbx_info *mbx)
1643 mbx->mbx_lock |= FM10K_MBX_REQ;
1645 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) |
1646 FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) |
1647 FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD);
1651 * fm10k_sm_mbx_create_connect_hdr - Generate a mailbox header for local FIFO
1652 * @mbx: pointer to mailbox
1653 * @err: error flags to report if any
1655 * This function returns a connection mailbox header
1657 STATIC void fm10k_sm_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx, u8 err)
1660 mbx->mbx_lock |= FM10K_MBX_REQ;
1662 mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) |
1663 FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) |
1664 FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD) |
1665 FM10K_MSG_HDR_FIELD_SET(err, SM_ERR);
1669 * fm10k_sm_mbx_connect_reset - Reset following request for reset
1670 * @mbx: pointer to mailbox
1672 * This function resets the mailbox to a just connected state
1674 STATIC void fm10k_sm_mbx_connect_reset(struct fm10k_mbx_info *mbx)
1676 /* flush any uncompleted work */
1677 fm10k_mbx_reset_work(mbx);
1679 /* set local version to max and remote version to 0 */
1680 mbx->local = FM10K_SM_MBX_VERSION;
1683 /* initialize tail and head */
1687 /* reset state back to connect */
1688 mbx->state = FM10K_STATE_CONNECT;
1692 * fm10k_sm_mbx_connect - Start switch manager mailbox connection
1693 * @hw: pointer to hardware structure
1694 * @mbx: pointer to mailbox
1696 * This function will initiate a mailbox connection with the switch
1697 * manager. To do this it will first disconnect the mailbox, and then
1698 * reconnect it in order to complete a reset of the mailbox.
1700 * This function will return an error if the mailbox has not been initiated
1701 * or is currently in use.
1703 STATIC s32 fm10k_sm_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx)
1705 DEBUGFUNC("fm10k_mbx_connect");
1707 /* we cannot connect an uninitialized mailbox */
1708 if (!mbx->rx.buffer)
1709 return FM10K_MBX_ERR_NO_SPACE;
1711 /* we cannot connect an already connected mailbox */
1712 if (mbx->state != FM10K_STATE_CLOSED)
1713 return FM10K_MBX_ERR_BUSY;
1715 /* mailbox timeout can now become active */
1716 mbx->timeout = FM10K_MBX_INIT_TIMEOUT;
1718 /* Place mbx in ready to connect state */
1719 mbx->state = FM10K_STATE_CONNECT;
1720 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
1722 /* reset interface back to connect */
1723 fm10k_sm_mbx_connect_reset(mbx);
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;
1729 /* generate and load connect header into mailbox */
1730 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
1731 fm10k_mbx_write(hw, mbx);
1733 /* enable interrupt and notify other party of new message */
1735 return FM10K_SUCCESS;
1739 * fm10k_sm_mbx_disconnect - Shutdown mailbox connection
1740 * @hw: pointer to hardware structure
1741 * @mbx: pointer to mailbox
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.
1748 * Any mailbox transactions not completed before calling this function
1749 * are not guaranteed to complete and may be dropped.
1751 STATIC void fm10k_sm_mbx_disconnect(struct fm10k_hw *hw,
1752 struct fm10k_mbx_info *mbx)
1754 int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0;
1756 DEBUGFUNC("fm10k_sm_mbx_disconnect");
1758 /* Place mbx in ready to disconnect state */
1759 mbx->state = FM10K_STATE_DISCONNECT;
1761 /* trigger interrupt to start shutdown process */
1762 FM10K_WRITE_REG(hw, mbx->mbx_reg, FM10K_MBX_REQ |
1763 FM10K_MBX_INTERRUPT_DISABLE);
1765 usec_delay(FM10K_MBX_POLL_DELAY);
1766 mbx->ops.process(hw, mbx);
1767 timeout -= FM10K_MBX_POLL_DELAY;
1768 } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED));
1770 /* in case we didn't close just force the mailbox into shutdown */
1771 mbx->state = FM10K_STATE_CLOSED;
1773 fm10k_mbx_reset_work(mbx);
1774 fm10k_mbx_update_max_size(mbx, 0);
1776 FM10K_WRITE_REG(hw, mbx->mbmem_reg, 0);
1780 * fm10k_mbx_validate_fifo_hdr - Validate fields in the remote FIFO header
1781 * @mbx: pointer to mailbox
1783 * This function will parse up the fields in the mailbox header and return
1784 * an error if the header contains any of a number of invalid configurations
1785 * including unrecognized offsets or version numbers.
1787 STATIC s32 fm10k_sm_mbx_validate_fifo_hdr(struct fm10k_mbx_info *mbx)
1789 const u32 *hdr = &mbx->mbx_hdr;
1790 u16 tail, head, ver;
1792 DEBUGFUNC("fm10k_mbx_validate_msg_hdr");
1794 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL);
1795 ver = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_VER);
1796 head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD);
1801 case FM10K_SM_MBX_VERSION:
1802 if (!head || head > FM10K_SM_MBX_FIFO_LEN)
1803 return FM10K_MBX_ERR_HEAD;
1804 if (!tail || tail > FM10K_SM_MBX_FIFO_LEN)
1805 return FM10K_MBX_ERR_TAIL;
1806 if (mbx->tail < head)
1807 head += mbx->mbmem_len - 1;
1808 if (tail < mbx->head)
1809 tail += mbx->mbmem_len - 1;
1810 if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len)
1811 return FM10K_MBX_ERR_HEAD;
1812 if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len)
1814 return FM10K_MBX_ERR_TAIL;
1816 return FM10K_MBX_ERR_SRC;
1819 return FM10K_SUCCESS;
1823 * fm10k_sm_mbx_process_error - Process header with error flag set
1824 * @mbx: pointer to mailbox
1826 * This function is meant to respond to a request where the error flag
1827 * is set. As a result we will terminate a connection if one is present
1828 * and fall back into the reset state with a connection header of version
1831 STATIC void fm10k_sm_mbx_process_error(struct fm10k_mbx_info *mbx)
1833 const enum fm10k_mbx_state state = mbx->state;
1836 case FM10K_STATE_DISCONNECT:
1837 /* if there is an error just disconnect */
1840 case FM10K_STATE_OPEN:
1841 /* flush any uncompleted work */
1842 fm10k_sm_mbx_connect_reset(mbx);
1844 case FM10K_STATE_CONNECT:
1845 /* try connnecting at lower version */
1847 while (mbx->local > 1)
1856 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
1860 * fm10k_sm_mbx_create_error_message - Process an error in FIFO hdr
1861 * @mbx: pointer to mailbox
1862 * @err: local error encountered
1864 * This function will interpret the error provided by err, and based on
1865 * that it may set the error bit in the local message header
1867 STATIC void fm10k_sm_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err)
1869 /* only generate an error message for these types */
1871 case FM10K_MBX_ERR_TAIL:
1872 case FM10K_MBX_ERR_HEAD:
1873 case FM10K_MBX_ERR_SRC:
1874 case FM10K_MBX_ERR_SIZE:
1875 case FM10K_MBX_ERR_RSVD0:
1881 /* process it as though we received an error, and send error reply */
1882 fm10k_sm_mbx_process_error(mbx);
1883 fm10k_sm_mbx_create_connect_hdr(mbx, 1);
1887 * fm10k_sm_mbx_receive - Take message from Rx mailbox FIFO and put it in Rx
1888 * @hw: pointer to hardware structure
1889 * @mbx: pointer to mailbox
1891 * This function will dequeue one message from the Rx switch manager mailbox
1892 * FIFO and place it in the Rx mailbox FIFO for processing by software.
1894 STATIC s32 fm10k_sm_mbx_receive(struct fm10k_hw *hw,
1895 struct fm10k_mbx_info *mbx,
1898 /* reduce length by 1 to convert to a mask */
1899 u16 mbmem_len = mbx->mbmem_len - 1;
1902 DEBUGFUNC("fm10k_sm_mbx_receive");
1904 /* push tail in front of head */
1905 if (tail < mbx->head)
1908 /* copy data to the Rx FIFO */
1909 err = fm10k_mbx_push_tail(hw, mbx, tail);
1913 /* process messages if we have received any */
1914 fm10k_mbx_dequeue_rx(hw, mbx);
1916 /* guarantee head aligns with the end of the last message */
1917 mbx->head = fm10k_mbx_head_sub(mbx, mbx->pushed);
1920 /* clear any extra bits left over since index adds 1 extra bit */
1921 if (mbx->head > mbmem_len)
1922 mbx->head -= mbmem_len;
1928 * fm10k_sm_mbx_transmit - Take message from Tx and put it in Tx mailbox FIFO
1929 * @hw: pointer to hardware structure
1930 * @mbx: pointer to mailbox
1932 * This function will dequeue one message from the Tx mailbox FIFO and place
1933 * it in the Tx switch manager mailbox FIFO for processing by hardware.
1935 STATIC void fm10k_sm_mbx_transmit(struct fm10k_hw *hw,
1936 struct fm10k_mbx_info *mbx, u16 head)
1938 struct fm10k_mbx_fifo *fifo = &mbx->tx;
1939 /* reduce length by 1 to convert to a mask */
1940 u16 mbmem_len = mbx->mbmem_len - 1;
1941 u16 tail_len, len = 0;
1944 DEBUGFUNC("fm10k_sm_mbx_transmit");
1946 /* push head behind tail */
1947 if (mbx->tail < head)
1950 fm10k_mbx_pull_head(hw, mbx, head);
1952 /* determine msg aligned offset for end of buffer */
1954 msg = fifo->buffer + fm10k_fifo_head_offset(fifo, len);
1956 len += FM10K_TLV_DWORD_LEN(*msg);
1957 } while ((len <= mbx->tail_len) && (len < mbmem_len));
1959 /* guarantee we stop on a message boundary */
1960 if (mbx->tail_len > tail_len) {
1961 mbx->tail = fm10k_mbx_tail_sub(mbx, mbx->tail_len - tail_len);
1962 mbx->tail_len = tail_len;
1965 /* clear any extra bits left over since index adds 1 extra bit */
1966 if (mbx->tail > mbmem_len)
1967 mbx->tail -= mbmem_len;
1971 * fm10k_sm_mbx_create_reply - Generate reply based on state and remote head
1972 * @mbx: pointer to mailbox
1973 * @head: acknowledgement number
1975 * This function will generate an outgoing message based on the current
1976 * mailbox state and the remote fifo head. It will return the length
1977 * of the outgoing message excluding header on success, and a negative value
1980 STATIC void fm10k_sm_mbx_create_reply(struct fm10k_hw *hw,
1981 struct fm10k_mbx_info *mbx, u16 head)
1983 switch (mbx->state) {
1984 case FM10K_STATE_OPEN:
1985 case FM10K_STATE_DISCONNECT:
1986 /* flush out Tx data */
1987 fm10k_sm_mbx_transmit(hw, mbx, head);
1989 /* generate new header based on data */
1990 if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) {
1991 fm10k_sm_mbx_create_data_hdr(mbx);
1994 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
1997 case FM10K_STATE_CONNECT:
1998 case FM10K_STATE_CLOSED:
1999 fm10k_sm_mbx_create_connect_hdr(mbx, 0);
2007 * fm10k_sm_mbx_process_reset - Process header with version == 0 (RESET)
2008 * @hw: pointer to hardware structure
2009 * @mbx: pointer to mailbox
2011 * This function is meant to respond to a request where the version data
2012 * is set to 0. As such we will either terminate the connection or go
2013 * into the connect state in order to re-establish the connection. This
2014 * function can also be used to respond to an error as the connection
2015 * resetting would also be a means of dealing with errors.
2017 STATIC void fm10k_sm_mbx_process_reset(struct fm10k_hw *hw,
2018 struct fm10k_mbx_info *mbx)
2020 const enum fm10k_mbx_state state = mbx->state;
2023 case FM10K_STATE_DISCONNECT:
2024 /* drop remote connections and disconnect */
2025 mbx->state = FM10K_STATE_CLOSED;
2029 case FM10K_STATE_OPEN:
2030 /* flush any incomplete work */
2031 fm10k_sm_mbx_connect_reset(mbx);
2033 case FM10K_STATE_CONNECT:
2034 /* Update remote value to match local value */
2035 mbx->remote = mbx->local;
2040 fm10k_sm_mbx_create_reply(hw, mbx, mbx->tail);
2044 * fm10k_sm_mbx_process_version_1 - Process header with version == 1
2045 * @hw: pointer to hardware structure
2046 * @mbx: pointer to mailbox
2048 * This function is meant to process messages received when the remote
2049 * mailbox is active.
2051 STATIC s32 fm10k_sm_mbx_process_version_1(struct fm10k_hw *hw,
2052 struct fm10k_mbx_info *mbx)
2054 const u32 *hdr = &mbx->mbx_hdr;
2058 /* pull all fields needed for verification */
2059 tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL);
2060 head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD);
2062 /* if we are in connect and wanting version 1 then start up and go */
2063 if (mbx->state == FM10K_STATE_CONNECT) {
2066 if (mbx->remote != 1)
2067 return FM10K_MBX_ERR_SRC;
2069 mbx->state = FM10K_STATE_OPEN;
2073 /* abort on message size errors */
2074 len = fm10k_sm_mbx_receive(hw, mbx, tail);
2078 /* continue until we have flushed the Rx FIFO */
2082 fm10k_sm_mbx_create_reply(hw, mbx, head);
2084 return FM10K_SUCCESS;
2088 * fm10k_sm_mbx_process - Process mailbox switch mailbox interrupt
2089 * @hw: pointer to hardware structure
2090 * @mbx: pointer to mailbox
2092 * This function will process incoming mailbox events and generate mailbox
2093 * replies. It will return a value indicating the number of DWORDs
2094 * transmitted excluding header on success or a negative value on error.
2096 STATIC s32 fm10k_sm_mbx_process(struct fm10k_hw *hw,
2097 struct fm10k_mbx_info *mbx)
2101 DEBUGFUNC("fm10k_sm_mbx_process");
2103 /* we do not read mailbox if closed */
2104 if (mbx->state == FM10K_STATE_CLOSED)
2105 return FM10K_SUCCESS;
2107 /* retrieve data from switch manager */
2108 err = fm10k_mbx_read(hw, mbx);
2112 err = fm10k_sm_mbx_validate_fifo_hdr(mbx);
2116 if (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_ERR)) {
2117 fm10k_sm_mbx_process_error(mbx);
2121 switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_VER)) {
2123 fm10k_sm_mbx_process_reset(hw, mbx);
2125 case FM10K_SM_MBX_VERSION:
2126 err = fm10k_sm_mbx_process_version_1(hw, mbx);
2132 fm10k_sm_mbx_create_error_msg(mbx, err);
2134 /* report data to switch manager */
2135 fm10k_mbx_write(hw, mbx);
2141 * fm10k_sm_mbx_init - Initialize mailbox memory for PF/SM mailbox
2142 * @hw: pointer to hardware structure
2143 * @mbx: pointer to mailbox
2144 * @msg_data: handlers for mailbox events
2146 * This function for now is used to stub out the PF/SM mailbox
2148 s32 fm10k_sm_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx,
2149 const struct fm10k_msg_data *msg_data)
2151 DEBUGFUNC("fm10k_sm_mbx_init");
2152 UNREFERENCED_1PARAMETER(hw);
2154 mbx->mbx_reg = FM10K_GMBX;
2155 mbx->mbmem_reg = FM10K_MBMEM_PF(0);
2157 /* start out in closed state */
2158 mbx->state = FM10K_STATE_CLOSED;
2160 /* validate layout of handlers before assigning them */
2161 if (fm10k_mbx_validate_handlers(msg_data))
2162 return FM10K_ERR_PARAM;
2164 /* initialize the message handlers */
2165 mbx->msg_data = msg_data;
2167 /* start mailbox as timed out and let the reset_hw call
2168 * set the timeout value to begin communications
2171 mbx->usec_delay = FM10K_MBX_INIT_DELAY;
2173 /* Split buffer for use by Tx/Rx FIFOs */
2174 mbx->max_size = FM10K_MBX_MSG_MAX_SIZE;
2175 mbx->mbmem_len = FM10K_MBMEM_PF_XOR;
2177 /* initialize the FIFOs, sizes are in 4 byte increments */
2178 fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE);
2179 fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE],
2180 FM10K_MBX_RX_BUFFER_SIZE);
2182 /* initialize function pointers */
2183 mbx->ops.connect = fm10k_sm_mbx_connect;
2184 mbx->ops.disconnect = fm10k_sm_mbx_disconnect;
2185 mbx->ops.rx_ready = fm10k_mbx_rx_ready;
2186 mbx->ops.tx_ready = fm10k_mbx_tx_ready;
2187 mbx->ops.tx_complete = fm10k_mbx_tx_complete;
2188 mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx;
2189 mbx->ops.process = fm10k_sm_mbx_process;
2190 mbx->ops.register_handlers = fm10k_mbx_register_handlers;
2192 return FM10K_SUCCESS;