/* Intel Ethernet Switch Host Interface Driver * Copyright(c) 2013 - 2015 Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * * Contact Information: * e1000-devel Mailing List * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 */ #include "fm10k_common.h" /** * fm10k_fifo_init - Initialize a message FIFO * @fifo: pointer to FIFO * @buffer: pointer to memory to be used to store FIFO * @size: maximum message size to store in FIFO, must be 2^n - 1 **/ static void fm10k_fifo_init(struct fm10k_mbx_fifo *fifo, u32 *buffer, u16 size) { fifo->buffer = buffer; fifo->size = size; fifo->head = 0; fifo->tail = 0; } /** * fm10k_fifo_used - Retrieve used space in FIFO * @fifo: pointer to FIFO * * This function returns the number of DWORDs used in the FIFO **/ static u16 fm10k_fifo_used(struct fm10k_mbx_fifo *fifo) { return fifo->tail - fifo->head; } /** * fm10k_fifo_unused - Retrieve unused space in FIFO * @fifo: pointer to FIFO * * This function returns the number of unused DWORDs in the FIFO **/ static u16 fm10k_fifo_unused(struct fm10k_mbx_fifo *fifo) { return fifo->size + fifo->head - fifo->tail; } /** * fm10k_fifo_empty - Test to verify if fifo is empty * @fifo: pointer to FIFO * * This function returns true if the FIFO is empty, else false **/ static bool fm10k_fifo_empty(struct fm10k_mbx_fifo *fifo) { return fifo->head == fifo->tail; } /** * fm10k_fifo_head_offset - returns indices of head with given offset * @fifo: pointer to FIFO * @offset: offset to add to head * * This function returns the indices into the fifo based on head + offset **/ static u16 fm10k_fifo_head_offset(struct fm10k_mbx_fifo *fifo, u16 offset) { return (fifo->head + offset) & (fifo->size - 1); } /** * fm10k_fifo_tail_offset - returns indices of tail with given offset * @fifo: pointer to FIFO * @offset: offset to add to tail * * This function returns the indices into the fifo based on tail + offset **/ static u16 fm10k_fifo_tail_offset(struct fm10k_mbx_fifo *fifo, u16 offset) { return (fifo->tail + offset) & (fifo->size - 1); } /** * fm10k_fifo_head_len - Retrieve length of first message in FIFO * @fifo: pointer to FIFO * * This function returns the size of the first message in the FIFO **/ static u16 fm10k_fifo_head_len(struct fm10k_mbx_fifo *fifo) { u32 *head = fifo->buffer + fm10k_fifo_head_offset(fifo, 0); /* verify there is at least 1 DWORD in the fifo so *head is valid */ if (fm10k_fifo_empty(fifo)) return 0; /* retieve the message length */ return FM10K_TLV_DWORD_LEN(*head); } /** * fm10k_fifo_head_drop - Drop the first message in FIFO * @fifo: pointer to FIFO * * This function returns the size of the message dropped from the FIFO **/ static u16 fm10k_fifo_head_drop(struct fm10k_mbx_fifo *fifo) { u16 len = fm10k_fifo_head_len(fifo); /* update head so it is at the start of next frame */ fifo->head += len; return len; } /** * fm10k_mbx_index_len - Convert a head/tail index into a length value * @mbx: pointer to mailbox * @head: head index * @tail: head index * * This function takes the head and tail index and determines the length * of the data indicated by this pair. **/ static u16 fm10k_mbx_index_len(struct fm10k_mbx_info *mbx, u16 head, u16 tail) { u16 len = tail - head; /* we wrapped so subtract 2, one for index 0, one for all 1s index */ if (len > tail) len -= 2; return len & ((mbx->mbmem_len << 1) - 1); } /** * fm10k_mbx_tail_add - Determine new tail value with added offset * @mbx: pointer to mailbox * @offset: length to add to head offset * * This function takes the local tail index and recomputes it for * a given length added as an offset. **/ static u16 fm10k_mbx_tail_add(struct fm10k_mbx_info *mbx, u16 offset) { u16 tail = (mbx->tail + offset + 1) & ((mbx->mbmem_len << 1) - 1); /* add/sub 1 because we cannot have offset 0 or all 1s */ return (tail > mbx->tail) ? --tail : ++tail; } /** * fm10k_mbx_tail_sub - Determine new tail value with subtracted offset * @mbx: pointer to mailbox * @offset: length to add to head offset * * This function takes the local tail index and recomputes it for * a given length added as an offset. **/ static u16 fm10k_mbx_tail_sub(struct fm10k_mbx_info *mbx, u16 offset) { u16 tail = (mbx->tail - offset - 1) & ((mbx->mbmem_len << 1) - 1); /* sub/add 1 because we cannot have offset 0 or all 1s */ return (tail < mbx->tail) ? ++tail : --tail; } /** * fm10k_mbx_head_add - Determine new head value with added offset * @mbx: pointer to mailbox * @offset: length to add to head offset * * This function takes the local head index and recomputes it for * a given length added as an offset. **/ static u16 fm10k_mbx_head_add(struct fm10k_mbx_info *mbx, u16 offset) { u16 head = (mbx->head + offset + 1) & ((mbx->mbmem_len << 1) - 1); /* add/sub 1 because we cannot have offset 0 or all 1s */ return (head > mbx->head) ? --head : ++head; } /** * fm10k_mbx_head_sub - Determine new head value with subtracted offset * @mbx: pointer to mailbox * @offset: length to add to head offset * * This function takes the local head index and recomputes it for * a given length added as an offset. **/ static u16 fm10k_mbx_head_sub(struct fm10k_mbx_info *mbx, u16 offset) { u16 head = (mbx->head - offset - 1) & ((mbx->mbmem_len << 1) - 1); /* sub/add 1 because we cannot have offset 0 or all 1s */ return (head < mbx->head) ? ++head : --head; } /** * fm10k_mbx_pushed_tail_len - Retrieve the length of message being pushed * @mbx: pointer to mailbox * * This function will return the length of the message currently being * pushed onto the tail of the Rx queue. **/ static u16 fm10k_mbx_pushed_tail_len(struct fm10k_mbx_info *mbx) { u32 *tail = mbx->rx.buffer + fm10k_fifo_tail_offset(&mbx->rx, 0); /* pushed tail is only valid if pushed is set */ if (!mbx->pushed) return 0; return FM10K_TLV_DWORD_LEN(*tail); } /** * fm10k_fifo_write_copy - pulls data off of msg and places it in fifo * @fifo: pointer to FIFO * @msg: message array to populate * @tail_offset: additional offset to add to tail pointer * @len: length of FIFO to copy into message header * * This function will take a message and copy it into a section of the * FIFO. In order to get something into a location other than just * the tail you can use tail_offset to adjust the pointer. **/ static void fm10k_fifo_write_copy(struct fm10k_mbx_fifo *fifo, const u32 *msg, u16 tail_offset, u16 len) { u16 end = fm10k_fifo_tail_offset(fifo, tail_offset); u32 *tail = fifo->buffer + end; /* track when we should cross the end of the FIFO */ end = fifo->size - end; /* copy end of message before start of message */ if (end < len) memcpy(fifo->buffer, msg + end, (len - end) << 2); else end = len; /* Copy remaining message into Tx FIFO */ memcpy(tail, msg, end << 2); } /** * fm10k_fifo_enqueue - Enqueues the message to the tail of the FIFO * @fifo: pointer to FIFO * @msg: message array to read * * This function enqueues a message up to the size specified by the length * contained in the first DWORD of the message and will place at the tail * of the FIFO. It will return 0 on success, or a negative value on error. **/ static s32 fm10k_fifo_enqueue(struct fm10k_mbx_fifo *fifo, const u32 *msg) { u16 len = FM10K_TLV_DWORD_LEN(*msg); /* verify parameters */ if (len > fifo->size) return FM10K_MBX_ERR_SIZE; /* verify there is room for the message */ if (len > fm10k_fifo_unused(fifo)) return FM10K_MBX_ERR_NO_SPACE; /* Copy message into FIFO */ fm10k_fifo_write_copy(fifo, msg, 0, len); /* memory barrier to guarantee FIFO is written before tail update */ wmb(); /* Update Tx FIFO tail */ fifo->tail += len; return 0; } /** * fm10k_mbx_validate_msg_size - Validate incoming message based on size * @mbx: pointer to mailbox * @len: length of data pushed onto buffer * * This function analyzes the frame and will return a non-zero value when * the start of a message larger than the mailbox is detected. **/ static u16 fm10k_mbx_validate_msg_size(struct fm10k_mbx_info *mbx, u16 len) { struct fm10k_mbx_fifo *fifo = &mbx->rx; u16 total_len = 0, msg_len; u32 *msg; /* length should include previous amounts pushed */ len += mbx->pushed; /* offset in message is based off of current message size */ do { msg = fifo->buffer + fm10k_fifo_tail_offset(fifo, total_len); msg_len = FM10K_TLV_DWORD_LEN(*msg); total_len += msg_len; } while (total_len < len); /* message extends out of pushed section, but fits in FIFO */ if ((len < total_len) && (msg_len <= mbx->rx.size)) return 0; /* return length of invalid section */ return (len < total_len) ? len : (len - total_len); } /** * fm10k_mbx_write_copy - pulls data off of Tx FIFO and places it in mbmem * @mbx: pointer to mailbox * * This function will take a section of the Rx FIFO and copy it into the mbx->tail--; * mailbox memory. The offset in mbmem is based on the lower bits of the * tail and len determines the length to copy. **/ static void fm10k_mbx_write_copy(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { struct fm10k_mbx_fifo *fifo = &mbx->tx; u32 mbmem = mbx->mbmem_reg; u32 *head = fifo->buffer; u16 end, len, tail, mask; if (!mbx->tail_len) return; /* determine data length and mbmem tail index */ mask = mbx->mbmem_len - 1; len = mbx->tail_len; tail = fm10k_mbx_tail_sub(mbx, len); if (tail > mask) tail++; /* determine offset in the ring */ end = fm10k_fifo_head_offset(fifo, mbx->pulled); head += end; /* memory barrier to guarantee data is ready to be read */ rmb(); /* Copy message from Tx FIFO */ for (end = fifo->size - end; len; head = fifo->buffer) { do { /* adjust tail to match offset for FIFO */ tail &= mask; if (!tail) tail++; /* write message to hardware FIFO */ fm10k_write_reg(hw, mbmem + tail++, *(head++)); } while (--len && --end); } } /** * fm10k_mbx_pull_head - Pulls data off of head of Tx FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * @head: acknowledgement number last received * * This function will push the tail index forward based on the remote * head index. It will then pull up to mbmem_len DWORDs off of the * head of the FIFO and will place it in the MBMEM registers * associated with the mailbox. **/ static void fm10k_mbx_pull_head(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 head) { u16 mbmem_len, len, ack = fm10k_mbx_index_len(mbx, head, mbx->tail); struct fm10k_mbx_fifo *fifo = &mbx->tx; /* update number of bytes pulled and update bytes in transit */ mbx->pulled += mbx->tail_len - ack; /* determine length of data to pull, reserve space for mbmem header */ mbmem_len = mbx->mbmem_len - 1; len = fm10k_fifo_used(fifo) - mbx->pulled; if (len > mbmem_len) len = mbmem_len; /* update tail and record number of bytes in transit */ mbx->tail = fm10k_mbx_tail_add(mbx, len - ack); mbx->tail_len = len; /* drop pulled messages from the FIFO */ for (len = fm10k_fifo_head_len(fifo); len && (mbx->pulled >= len); len = fm10k_fifo_head_len(fifo)) { mbx->pulled -= fm10k_fifo_head_drop(fifo); mbx->tx_messages++; mbx->tx_dwords += len; } /* Copy message out from the Tx FIFO */ fm10k_mbx_write_copy(hw, mbx); } /** * fm10k_mbx_read_copy - pulls data off of mbmem and places it in Rx FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will take a section of the mailbox memory and copy it * into the Rx FIFO. The offset is based on the lower bits of the * head and len determines the length to copy. **/ static void fm10k_mbx_read_copy(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { struct fm10k_mbx_fifo *fifo = &mbx->rx; u32 mbmem = mbx->mbmem_reg ^ mbx->mbmem_len; u32 *tail = fifo->buffer; u16 end, len, head; /* determine data length and mbmem head index */ len = mbx->head_len; head = fm10k_mbx_head_sub(mbx, len); if (head >= mbx->mbmem_len) head++; /* determine offset in the ring */ end = fm10k_fifo_tail_offset(fifo, mbx->pushed); tail += end; /* Copy message into Rx FIFO */ for (end = fifo->size - end; len; tail = fifo->buffer) { do { /* adjust head to match offset for FIFO */ head &= mbx->mbmem_len - 1; if (!head) head++; /* read message from hardware FIFO */ *(tail++) = fm10k_read_reg(hw, mbmem + head++); } while (--len && --end); } /* memory barrier to guarantee FIFO is written before tail update */ wmb(); } /** * fm10k_mbx_push_tail - Pushes up to 15 DWORDs on to tail of FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * @tail: tail index of message * * This function will first validate the tail index and size for the * incoming message. It then updates the acknowledgment number and * copies the data into the FIFO. It will return the number of messages * dequeued on success and a negative value on error. **/ static s32 fm10k_mbx_push_tail(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 tail) { struct fm10k_mbx_fifo *fifo = &mbx->rx; u16 len, seq = fm10k_mbx_index_len(mbx, mbx->head, tail); /* determine length of data to push */ len = fm10k_fifo_unused(fifo) - mbx->pushed; if (len > seq) len = seq; /* update head and record bytes received */ mbx->head = fm10k_mbx_head_add(mbx, len); mbx->head_len = len; /* nothing to do if there is no data */ if (!len) return 0; /* Copy msg into Rx FIFO */ fm10k_mbx_read_copy(hw, mbx); /* determine if there are any invalid lengths in message */ if (fm10k_mbx_validate_msg_size(mbx, len)) return FM10K_MBX_ERR_SIZE; /* Update pushed */ mbx->pushed += len; /* flush any completed messages */ for (len = fm10k_mbx_pushed_tail_len(mbx); len && (mbx->pushed >= len); len = fm10k_mbx_pushed_tail_len(mbx)) { fifo->tail += len; mbx->pushed -= len; mbx->rx_messages++; mbx->rx_dwords += len; } return 0; } /* pre-generated data for generating the CRC based on the poly 0xAC9A. */ static const u16 fm10k_crc_16b_table[256] = { 0x0000, 0x7956, 0xF2AC, 0x8BFA, 0xBC6D, 0xC53B, 0x4EC1, 0x3797, 0x21EF, 0x58B9, 0xD343, 0xAA15, 0x9D82, 0xE4D4, 0x6F2E, 0x1678, 0x43DE, 0x3A88, 0xB172, 0xC824, 0xFFB3, 0x86E5, 0x0D1F, 0x7449, 0x6231, 0x1B67, 0x909D, 0xE9CB, 0xDE5C, 0xA70A, 0x2CF0, 0x55A6, 0x87BC, 0xFEEA, 0x7510, 0x0C46, 0x3BD1, 0x4287, 0xC97D, 0xB02B, 0xA653, 0xDF05, 0x54FF, 0x2DA9, 0x1A3E, 0x6368, 0xE892, 0x91C4, 0xC462, 0xBD34, 0x36CE, 0x4F98, 0x780F, 0x0159, 0x8AA3, 0xF3F5, 0xE58D, 0x9CDB, 0x1721, 0x6E77, 0x59E0, 0x20B6, 0xAB4C, 0xD21A, 0x564D, 0x2F1B, 0xA4E1, 0xDDB7, 0xEA20, 0x9376, 0x188C, 0x61DA, 0x77A2, 0x0EF4, 0x850E, 0xFC58, 0xCBCF, 0xB299, 0x3963, 0x4035, 0x1593, 0x6CC5, 0xE73F, 0x9E69, 0xA9FE, 0xD0A8, 0x5B52, 0x2204, 0x347C, 0x4D2A, 0xC6D0, 0xBF86, 0x8811, 0xF147, 0x7ABD, 0x03EB, 0xD1F1, 0xA8A7, 0x235D, 0x5A0B, 0x6D9C, 0x14CA, 0x9F30, 0xE666, 0xF01E, 0x8948, 0x02B2, 0x7BE4, 0x4C73, 0x3525, 0xBEDF, 0xC789, 0x922F, 0xEB79, 0x6083, 0x19D5, 0x2E42, 0x5714, 0xDCEE, 0xA5B8, 0xB3C0, 0xCA96, 0x416C, 0x383A, 0x0FAD, 0x76FB, 0xFD01, 0x8457, 0xAC9A, 0xD5CC, 0x5E36, 0x2760, 0x10F7, 0x69A1, 0xE25B, 0x9B0D, 0x8D75, 0xF423, 0x7FD9, 0x068F, 0x3118, 0x484E, 0xC3B4, 0xBAE2, 0xEF44, 0x9612, 0x1DE8, 0x64BE, 0x5329, 0x2A7F, 0xA185, 0xD8D3, 0xCEAB, 0xB7FD, 0x3C07, 0x4551, 0x72C6, 0x0B90, 0x806A, 0xF93C, 0x2B26, 0x5270, 0xD98A, 0xA0DC, 0x974B, 0xEE1D, 0x65E7, 0x1CB1, 0x0AC9, 0x739F, 0xF865, 0x8133, 0xB6A4, 0xCFF2, 0x4408, 0x3D5E, 0x68F8, 0x11AE, 0x9A54, 0xE302, 0xD495, 0xADC3, 0x2639, 0x5F6F, 0x4917, 0x3041, 0xBBBB, 0xC2ED, 0xF57A, 0x8C2C, 0x07D6, 0x7E80, 0xFAD7, 0x8381, 0x087B, 0x712D, 0x46BA, 0x3FEC, 0xB416, 0xCD40, 0xDB38, 0xA26E, 0x2994, 0x50C2, 0x6755, 0x1E03, 0x95F9, 0xECAF, 0xB909, 0xC05F, 0x4BA5, 0x32F3, 0x0564, 0x7C32, 0xF7C8, 0x8E9E, 0x98E6, 0xE1B0, 0x6A4A, 0x131C, 0x248B, 0x5DDD, 0xD627, 0xAF71, 0x7D6B, 0x043D, 0x8FC7, 0xF691, 0xC106, 0xB850, 0x33AA, 0x4AFC, 0x5C84, 0x25D2, 0xAE28, 0xD77E, 0xE0E9, 0x99BF, 0x1245, 0x6B13, 0x3EB5, 0x47E3, 0xCC19, 0xB54F, 0x82D8, 0xFB8E, 0x7074, 0x0922, 0x1F5A, 0x660C, 0xEDF6, 0x94A0, 0xA337, 0xDA61, 0x519B, 0x28CD }; /** * fm10k_crc_16b - Generate a 16 bit CRC for a region of 16 bit data * @data: pointer to data to process * @seed: seed value for CRC * @len: length measured in 16 bits words * * This function will generate a CRC based on the polynomial 0xAC9A and * whatever value is stored in the seed variable. Note that this * value inverts the local seed and the result in order to capture all * leading and trailing zeros. */ static u16 fm10k_crc_16b(const u32 *data, u16 seed, u16 len) { u32 result = seed; while (len--) { result ^= *(data++); result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; if (!(len--)) break; result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; result = (result >> 8) ^ fm10k_crc_16b_table[result & 0xFF]; } return (u16)result; } /** * fm10k_fifo_crc - generate a CRC based off of FIFO data * @fifo: pointer to FIFO * @offset: offset point for start of FIFO * @len: number of DWORDS words to process * @seed: seed value for CRC * * This function generates a CRC for some region of the FIFO **/ static u16 fm10k_fifo_crc(struct fm10k_mbx_fifo *fifo, u16 offset, u16 len, u16 seed) { u32 *data = fifo->buffer + offset; /* track when we should cross the end of the FIFO */ offset = fifo->size - offset; /* if we are in 2 blocks process the end of the FIFO first */ if (offset < len) { seed = fm10k_crc_16b(data, seed, offset * 2); data = fifo->buffer; len -= offset; } /* process any remaining bits */ return fm10k_crc_16b(data, seed, len * 2); } /** * fm10k_mbx_update_local_crc - Update the local CRC for outgoing data * @mbx: pointer to mailbox * @head: head index provided by remote mailbox * * This function will generate the CRC for all data from the end of the * last head update to the current one. It uses the result of the * previous CRC as the seed for this update. The result is stored in * mbx->local. **/ static void fm10k_mbx_update_local_crc(struct fm10k_mbx_info *mbx, u16 head) { u16 len = mbx->tail_len - fm10k_mbx_index_len(mbx, head, mbx->tail); /* determine the offset for the start of the region to be pulled */ head = fm10k_fifo_head_offset(&mbx->tx, mbx->pulled); /* update local CRC to include all of the pulled data */ mbx->local = fm10k_fifo_crc(&mbx->tx, head, len, mbx->local); } /** * fm10k_mbx_verify_remote_crc - Verify the CRC is correct for current data * @mbx: pointer to mailbox * * This function will take all data that has been provided from the remote * end and generate a CRC for it. This is stored in mbx->remote. The * CRC for the header is then computed and if the result is non-zero this * is an error and we signal an error dropping all data and resetting the * connection. */ static s32 fm10k_mbx_verify_remote_crc(struct fm10k_mbx_info *mbx) { struct fm10k_mbx_fifo *fifo = &mbx->rx; u16 len = mbx->head_len; u16 offset = fm10k_fifo_tail_offset(fifo, mbx->pushed) - len; u16 crc; /* update the remote CRC if new data has been received */ if (len) mbx->remote = fm10k_fifo_crc(fifo, offset, len, mbx->remote); /* process the full header as we have to validate the CRC */ crc = fm10k_crc_16b(&mbx->mbx_hdr, mbx->remote, 1); /* notify other end if we have a problem */ return crc ? FM10K_MBX_ERR_CRC : 0; } /** * fm10k_mbx_rx_ready - Indicates that a message is ready in the Rx FIFO * @mbx: pointer to mailbox * * This function returns true if there is a message in the Rx FIFO to dequeue. **/ static bool fm10k_mbx_rx_ready(struct fm10k_mbx_info *mbx) { u16 msg_size = fm10k_fifo_head_len(&mbx->rx); return msg_size && (fm10k_fifo_used(&mbx->rx) >= msg_size); } /** * fm10k_mbx_tx_ready - Indicates that the mailbox is in state ready for Tx * @mbx: pointer to mailbox * @len: verify free space is >= this value * * This function returns true if the mailbox is in a state ready to transmit. **/ static bool fm10k_mbx_tx_ready(struct fm10k_mbx_info *mbx, u16 len) { u16 fifo_unused = fm10k_fifo_unused(&mbx->tx); return (mbx->state == FM10K_STATE_OPEN) && (fifo_unused >= len); } /** * fm10k_mbx_tx_complete - Indicates that the Tx FIFO has been emptied * @mbx: pointer to mailbox * * This function returns true if the Tx FIFO is empty. **/ static bool fm10k_mbx_tx_complete(struct fm10k_mbx_info *mbx) { return fm10k_fifo_empty(&mbx->tx); } /** * fm10k_mbx_deqeueue_rx - Dequeues the message from the head in the Rx FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function dequeues messages and hands them off to the tlv parser. * It will return the number of messages processed when called. **/ static u16 fm10k_mbx_dequeue_rx(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { struct fm10k_mbx_fifo *fifo = &mbx->rx; s32 err; u16 cnt; /* parse Rx messages out of the Rx FIFO to empty it */ for (cnt = 0; !fm10k_fifo_empty(fifo); cnt++) { err = fm10k_tlv_msg_parse(hw, fifo->buffer + fifo->head, mbx, mbx->msg_data); if (err < 0) mbx->rx_parse_err++; fm10k_fifo_head_drop(fifo); } /* shift remaining bytes back to start of FIFO */ memmove(fifo->buffer, fifo->buffer + fifo->tail, mbx->pushed << 2); /* shift head and tail based on the memory we moved */ fifo->tail -= fifo->head; fifo->head = 0; return cnt; } /** * fm10k_mbx_enqueue_tx - Enqueues the message to the tail of the Tx FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * @msg: message array to read * * This function enqueues a message up to the size specified by the length * contained in the first DWORD of the message and will place at the tail * of the FIFO. It will return 0 on success, or a negative value on error. **/ static s32 fm10k_mbx_enqueue_tx(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, const u32 *msg) { u32 countdown = mbx->timeout; s32 err; switch (mbx->state) { case FM10K_STATE_CLOSED: case FM10K_STATE_DISCONNECT: return FM10K_MBX_ERR_NO_MBX; default: break; } /* enqueue the message on the Tx FIFO */ err = fm10k_fifo_enqueue(&mbx->tx, msg); /* if it failed give the FIFO a chance to drain */ while (err && countdown) { countdown--; udelay(mbx->udelay); mbx->ops.process(hw, mbx); err = fm10k_fifo_enqueue(&mbx->tx, msg); } /* if we failed treat the error */ if (err) { mbx->timeout = 0; mbx->tx_busy++; } /* begin processing message, ignore errors as this is just meant * to start the mailbox flow so we are not concerned if there * is a bad error, or the mailbox is already busy with a request */ if (!mbx->tail_len) mbx->ops.process(hw, mbx); return 0; } /** * fm10k_mbx_read - Copies the mbmem to local message buffer * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function copies the message from the mbmem to the message array **/ static s32 fm10k_mbx_read(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { /* only allow one reader in here at a time */ if (mbx->mbx_hdr) return FM10K_MBX_ERR_BUSY; /* read to capture initial interrupt bits */ if (fm10k_read_reg(hw, mbx->mbx_reg) & FM10K_MBX_REQ_INTERRUPT) mbx->mbx_lock = FM10K_MBX_ACK; /* write back interrupt bits to clear */ fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT); /* read remote header */ mbx->mbx_hdr = fm10k_read_reg(hw, mbx->mbmem_reg ^ mbx->mbmem_len); return 0; } /** * fm10k_mbx_write - Copies the local message buffer to mbmem * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function copies the message from the the message array to mbmem **/ static void fm10k_mbx_write(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { u32 mbmem = mbx->mbmem_reg; /* write new msg header to notify recipient of change */ fm10k_write_reg(hw, mbmem, mbx->mbx_hdr); /* write mailbox to send interrupt */ if (mbx->mbx_lock) fm10k_write_reg(hw, mbx->mbx_reg, mbx->mbx_lock); /* we no longer are using the header so free it */ mbx->mbx_hdr = 0; mbx->mbx_lock = 0; } /** * fm10k_mbx_create_connect_hdr - Generate a connect mailbox header * @mbx: pointer to mailbox * * This function returns a connection mailbox header **/ static void fm10k_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx) { mbx->mbx_lock |= FM10K_MBX_REQ; mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_CONNECT, TYPE) | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD) | FM10K_MSG_HDR_FIELD_SET(mbx->rx.size - 1, CONNECT_SIZE); } /** * fm10k_mbx_create_data_hdr - Generate a data mailbox header * @mbx: pointer to mailbox * * This function returns a data mailbox header **/ static void fm10k_mbx_create_data_hdr(struct fm10k_mbx_info *mbx) { u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DATA, TYPE) | FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); struct fm10k_mbx_fifo *fifo = &mbx->tx; u16 crc; if (mbx->tail_len) mbx->mbx_lock |= FM10K_MBX_REQ; /* generate CRC for data in flight and header */ crc = fm10k_fifo_crc(fifo, fm10k_fifo_head_offset(fifo, mbx->pulled), mbx->tail_len, mbx->local); crc = fm10k_crc_16b(&hdr, crc, 1); /* load header to memory to be written */ mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC); } /** * fm10k_mbx_create_disconnect_hdr - Generate a disconnect mailbox header * @mbx: pointer to mailbox * * This function returns a disconnect mailbox header **/ static void fm10k_mbx_create_disconnect_hdr(struct fm10k_mbx_info *mbx) { u32 hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_DISCONNECT, TYPE) | FM10K_MSG_HDR_FIELD_SET(mbx->tail, TAIL) | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); u16 crc = fm10k_crc_16b(&hdr, mbx->local, 1); mbx->mbx_lock |= FM10K_MBX_ACK; /* load header to memory to be written */ mbx->mbx_hdr = hdr | FM10K_MSG_HDR_FIELD_SET(crc, CRC); } /** * fm10k_mbx_create_error_msg - Generate a error message * @mbx: pointer to mailbox * @err: local error encountered * * This function will interpret the error provided by err, and based on * that it may shift the message by 1 DWORD and then place an error header * at the start of the message. **/ static void fm10k_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err) { /* only generate an error message for these types */ switch (err) { case FM10K_MBX_ERR_TAIL: case FM10K_MBX_ERR_HEAD: case FM10K_MBX_ERR_TYPE: case FM10K_MBX_ERR_SIZE: case FM10K_MBX_ERR_RSVD0: case FM10K_MBX_ERR_CRC: break; default: return; } mbx->mbx_lock |= FM10K_MBX_REQ; mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(FM10K_MSG_ERROR, TYPE) | FM10K_MSG_HDR_FIELD_SET(err, ERR_NO) | FM10K_MSG_HDR_FIELD_SET(mbx->head, HEAD); } /** * fm10k_mbx_validate_msg_hdr - Validate common fields in the message header * @mbx: pointer to mailbox * @msg: message array to read * * This function will parse up the fields in the mailbox header and return * an error if the header contains any of a number of invalid configurations * including unrecognized type, invalid route, or a malformed message. **/ static s32 fm10k_mbx_validate_msg_hdr(struct fm10k_mbx_info *mbx) { u16 type, rsvd0, head, tail, size; const u32 *hdr = &mbx->mbx_hdr; type = FM10K_MSG_HDR_FIELD_GET(*hdr, TYPE); rsvd0 = FM10K_MSG_HDR_FIELD_GET(*hdr, RSVD0); tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL); head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE); if (rsvd0) return FM10K_MBX_ERR_RSVD0; switch (type) { case FM10K_MSG_DISCONNECT: /* validate that all data has been received */ if (tail != mbx->head) return FM10K_MBX_ERR_TAIL; /* fall through */ case FM10K_MSG_DATA: /* validate that head is moving correctly */ if (!head || (head == FM10K_MSG_HDR_MASK(HEAD))) return FM10K_MBX_ERR_HEAD; if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len) return FM10K_MBX_ERR_HEAD; /* validate that tail is moving correctly */ if (!tail || (tail == FM10K_MSG_HDR_MASK(TAIL))) return FM10K_MBX_ERR_TAIL; if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len) break; return FM10K_MBX_ERR_TAIL; case FM10K_MSG_CONNECT: /* validate size is in range and is power of 2 mask */ if ((size < FM10K_VFMBX_MSG_MTU) || (size & (size + 1))) return FM10K_MBX_ERR_SIZE; /* fall through */ case FM10K_MSG_ERROR: if (!head || (head == FM10K_MSG_HDR_MASK(HEAD))) return FM10K_MBX_ERR_HEAD; /* neither create nor error include a tail offset */ if (tail) return FM10K_MBX_ERR_TAIL; break; default: return FM10K_MBX_ERR_TYPE; } return 0; } /** * fm10k_mbx_create_reply - Generate reply based on state and remote head * @mbx: pointer to mailbox * @head: acknowledgement number * * This function will generate an outgoing message based on the current * mailbox state and the remote fifo head. It will return the length * of the outgoing message excluding header on success, and a negative value * on error. **/ static s32 fm10k_mbx_create_reply(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 head) { switch (mbx->state) { case FM10K_STATE_OPEN: case FM10K_STATE_DISCONNECT: /* update our checksum for the outgoing data */ fm10k_mbx_update_local_crc(mbx, head); /* as long as other end recognizes us keep sending data */ fm10k_mbx_pull_head(hw, mbx, head); /* generate new header based on data */ if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) fm10k_mbx_create_data_hdr(mbx); else fm10k_mbx_create_disconnect_hdr(mbx); break; case FM10K_STATE_CONNECT: /* send disconnect even if we aren't connected */ fm10k_mbx_create_connect_hdr(mbx); break; case FM10K_STATE_CLOSED: /* generate new header based on data */ fm10k_mbx_create_disconnect_hdr(mbx); default: break; } return 0; } /** * fm10k_mbx_reset_work- Reset internal pointers for any pending work * @mbx: pointer to mailbox * * This function will reset all internal pointers so any work in progress * is dropped. This call should occur every time we transition from the * open state to the connect state. **/ static void fm10k_mbx_reset_work(struct fm10k_mbx_info *mbx) { /* reset our outgoing max size back to Rx limits */ mbx->max_size = mbx->rx.size - 1; /* just do a quick resysnc to start of message */ mbx->pushed = 0; mbx->pulled = 0; mbx->tail_len = 0; mbx->head_len = 0; mbx->rx.tail = 0; mbx->rx.head = 0; } /** * fm10k_mbx_update_max_size - Update the max_size and drop any large messages * @mbx: pointer to mailbox * @size: new value for max_size * * This function will update the max_size value and drop any outgoing messages * from the head of the Tx FIFO that are larger than max_size. **/ static void fm10k_mbx_update_max_size(struct fm10k_mbx_info *mbx, u16 size) { u16 len; mbx->max_size = size; /* flush any oversized messages from the queue */ for (len = fm10k_fifo_head_len(&mbx->tx); len > size; len = fm10k_fifo_head_len(&mbx->tx)) { fm10k_fifo_head_drop(&mbx->tx); mbx->tx_dropped++; } } /** * fm10k_mbx_connect_reset - Reset following request for reset * @mbx: pointer to mailbox * * This function resets the mailbox to either a disconnected state * or a connect state depending on the current mailbox state **/ static void fm10k_mbx_connect_reset(struct fm10k_mbx_info *mbx) { /* just do a quick resysnc to start of frame */ fm10k_mbx_reset_work(mbx); /* reset CRC seeds */ mbx->local = FM10K_MBX_CRC_SEED; mbx->remote = FM10K_MBX_CRC_SEED; /* we cannot exit connect until the size is good */ if (mbx->state == FM10K_STATE_OPEN) mbx->state = FM10K_STATE_CONNECT; else mbx->state = FM10K_STATE_CLOSED; } /** * fm10k_mbx_process_connect - Process connect header * @mbx: pointer to mailbox * @msg: message array to process * * This function will read an incoming connect header and reply with the * appropriate message. It will return a value indicating the number of * data DWORDs on success, or will return a negative value on failure. **/ static s32 fm10k_mbx_process_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const enum fm10k_mbx_state state = mbx->state; const u32 *hdr = &mbx->mbx_hdr; u16 size, head; /* we will need to pull all of the fields for verification */ size = FM10K_MSG_HDR_FIELD_GET(*hdr, CONNECT_SIZE); head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); switch (state) { case FM10K_STATE_DISCONNECT: case FM10K_STATE_OPEN: /* reset any in-progress work */ fm10k_mbx_connect_reset(mbx); break; case FM10K_STATE_CONNECT: /* we cannot exit connect until the size is good */ if (size > mbx->rx.size) { mbx->max_size = mbx->rx.size - 1; } else { /* record the remote system requesting connection */ mbx->state = FM10K_STATE_OPEN; fm10k_mbx_update_max_size(mbx, size); } break; default: break; } /* align our tail index to remote head index */ mbx->tail = head; return fm10k_mbx_create_reply(hw, mbx, head); } /** * fm10k_mbx_process_data - Process data header * @mbx: pointer to mailbox * * This function will read an incoming data header and reply with the * appropriate message. It will return a value indicating the number of * data DWORDs on success, or will return a negative value on failure. **/ static s32 fm10k_mbx_process_data(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const u32 *hdr = &mbx->mbx_hdr; u16 head, tail; s32 err; /* we will need to pull all of the fields for verification */ head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); tail = FM10K_MSG_HDR_FIELD_GET(*hdr, TAIL); /* if we are in connect just update our data and go */ if (mbx->state == FM10K_STATE_CONNECT) { mbx->tail = head; mbx->state = FM10K_STATE_OPEN; } /* abort on message size errors */ err = fm10k_mbx_push_tail(hw, mbx, tail); if (err < 0) return err; /* verify the checksum on the incoming data */ err = fm10k_mbx_verify_remote_crc(mbx); if (err) return err; /* process messages if we have received any */ fm10k_mbx_dequeue_rx(hw, mbx); return fm10k_mbx_create_reply(hw, mbx, head); } /** * fm10k_mbx_process_disconnect - Process disconnect header * @mbx: pointer to mailbox * * This function will read an incoming disconnect header and reply with the * appropriate message. It will return a value indicating the number of * data DWORDs on success, or will return a negative value on failure. **/ static s32 fm10k_mbx_process_disconnect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const enum fm10k_mbx_state state = mbx->state; const u32 *hdr = &mbx->mbx_hdr; u16 head; s32 err; /* we will need to pull the header field for verification */ head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); /* We should not be receiving disconnect if Rx is incomplete */ if (mbx->pushed) return FM10K_MBX_ERR_TAIL; /* we have already verified mbx->head == tail so we know this is 0 */ mbx->head_len = 0; /* verify the checksum on the incoming header is correct */ err = fm10k_mbx_verify_remote_crc(mbx); if (err) return err; switch (state) { case FM10K_STATE_DISCONNECT: case FM10K_STATE_OPEN: /* state doesn't change if we still have work to do */ if (!fm10k_mbx_tx_complete(mbx)) break; /* verify the head indicates we completed all transmits */ if (head != mbx->tail) return FM10K_MBX_ERR_HEAD; /* reset any in-progress work */ fm10k_mbx_connect_reset(mbx); break; default: break; } return fm10k_mbx_create_reply(hw, mbx, head); } /** * fm10k_mbx_process_error - Process error header * @mbx: pointer to mailbox * * This function will read an incoming error header and reply with the * appropriate message. It will return a value indicating the number of * data DWORDs on success, or will return a negative value on failure. **/ static s32 fm10k_mbx_process_error(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const u32 *hdr = &mbx->mbx_hdr; s32 err_no; u16 head; /* we will need to pull all of the fields for verification */ head = FM10K_MSG_HDR_FIELD_GET(*hdr, HEAD); /* we only have lower 10 bits of error number so add upper bits */ err_no = FM10K_MSG_HDR_FIELD_GET(*hdr, ERR_NO); err_no |= ~FM10K_MSG_HDR_MASK(ERR_NO); switch (mbx->state) { case FM10K_STATE_OPEN: case FM10K_STATE_DISCONNECT: /* flush any uncompleted work */ fm10k_mbx_reset_work(mbx); /* reset CRC seeds */ mbx->local = FM10K_MBX_CRC_SEED; mbx->remote = FM10K_MBX_CRC_SEED; /* reset tail index and size to prepare for reconnect */ mbx->tail = head; /* if open then reset max_size and go back to connect */ if (mbx->state == FM10K_STATE_OPEN) { mbx->state = FM10K_STATE_CONNECT; break; } /* send a connect message to get data flowing again */ fm10k_mbx_create_connect_hdr(mbx); return 0; default: break; } return fm10k_mbx_create_reply(hw, mbx, mbx->tail); } /** * fm10k_mbx_process - Process mailbox interrupt * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will process incoming mailbox events and generate mailbox * replies. It will return a value indicating the number of DWORDs * transmitted excluding header on success or a negative value on error. **/ static s32 fm10k_mbx_process(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { s32 err; /* we do not read mailbox if closed */ if (mbx->state == FM10K_STATE_CLOSED) return 0; /* copy data from mailbox */ err = fm10k_mbx_read(hw, mbx); if (err) return err; /* validate type, source, and destination */ err = fm10k_mbx_validate_msg_hdr(mbx); if (err < 0) goto msg_err; switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, TYPE)) { case FM10K_MSG_CONNECT: err = fm10k_mbx_process_connect(hw, mbx); break; case FM10K_MSG_DATA: err = fm10k_mbx_process_data(hw, mbx); break; case FM10K_MSG_DISCONNECT: err = fm10k_mbx_process_disconnect(hw, mbx); break; case FM10K_MSG_ERROR: err = fm10k_mbx_process_error(hw, mbx); break; default: err = FM10K_MBX_ERR_TYPE; break; } msg_err: /* notify partner of errors on our end */ if (err < 0) fm10k_mbx_create_error_msg(mbx, err); /* copy data from mailbox */ fm10k_mbx_write(hw, mbx); return err; } /** * fm10k_mbx_disconnect - Shutdown mailbox connection * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will shut down the mailbox. It places the mailbox first * in the disconnect state, it then allows up to a predefined timeout for * the mailbox to transition to close on its own. If this does not occur * then the mailbox will be forced into the closed state. * * Any mailbox transactions not completed before calling this function * are not guaranteed to complete and may be dropped. **/ static void fm10k_mbx_disconnect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0; /* Place mbx in ready to disconnect state */ mbx->state = FM10K_STATE_DISCONNECT; /* trigger interrupt to start shutdown process */ fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ | FM10K_MBX_INTERRUPT_DISABLE); do { udelay(FM10K_MBX_POLL_DELAY); mbx->ops.process(hw, mbx); timeout -= FM10K_MBX_POLL_DELAY; } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED)); /* in case we didn't close just force the mailbox into shutdown */ fm10k_mbx_connect_reset(mbx); fm10k_mbx_update_max_size(mbx, 0); fm10k_write_reg(hw, mbx->mbmem_reg, 0); } /** * fm10k_mbx_connect - Start mailbox connection * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will initiate a mailbox connection. It will populate the * mailbox with a broadcast connect message and then initialize the lock. * This is safe since the connect message is a single DWORD so the mailbox * transaction is guaranteed to be atomic. * * This function will return an error if the mailbox has not been initiated * or is currently in use. **/ static s32 fm10k_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { /* we cannot connect an uninitialized mailbox */ if (!mbx->rx.buffer) return FM10K_MBX_ERR_NO_SPACE; /* we cannot connect an already connected mailbox */ if (mbx->state != FM10K_STATE_CLOSED) return FM10K_MBX_ERR_BUSY; /* mailbox timeout can now become active */ mbx->timeout = FM10K_MBX_INIT_TIMEOUT; /* Place mbx in ready to connect state */ mbx->state = FM10K_STATE_CONNECT; /* initialize header of remote mailbox */ fm10k_mbx_create_disconnect_hdr(mbx); fm10k_write_reg(hw, mbx->mbmem_reg ^ mbx->mbmem_len, mbx->mbx_hdr); /* enable interrupt and notify other party of new message */ mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT | FM10K_MBX_INTERRUPT_ENABLE; /* generate and load connect header into mailbox */ fm10k_mbx_create_connect_hdr(mbx); fm10k_mbx_write(hw, mbx); return 0; } /** * fm10k_mbx_validate_handlers - Validate layout of message parsing data * @msg_data: handlers for mailbox events * * This function validates the layout of the message parsing data. This * should be mostly static, but it is important to catch any errors that * are made when constructing the parsers. **/ static s32 fm10k_mbx_validate_handlers(const struct fm10k_msg_data *msg_data) { const struct fm10k_tlv_attr *attr; unsigned int id; /* Allow NULL mailboxes that transmit but don't receive */ if (!msg_data) return 0; while (msg_data->id != FM10K_TLV_ERROR) { /* all messages should have a function handler */ if (!msg_data->func) return FM10K_ERR_PARAM; /* parser is optional */ attr = msg_data->attr; if (attr) { while (attr->id != FM10K_TLV_ERROR) { id = attr->id; attr++; /* ID should always be increasing */ if (id >= attr->id) return FM10K_ERR_PARAM; /* ID should fit in results array */ if (id >= FM10K_TLV_RESULTS_MAX) return FM10K_ERR_PARAM; } /* verify terminator is in the list */ if (attr->id != FM10K_TLV_ERROR) return FM10K_ERR_PARAM; } id = msg_data->id; msg_data++; /* ID should always be increasing */ if (id >= msg_data->id) return FM10K_ERR_PARAM; } /* verify terminator is in the list */ if ((msg_data->id != FM10K_TLV_ERROR) || !msg_data->func) return FM10K_ERR_PARAM; return 0; } /** * fm10k_mbx_register_handlers - Register a set of handler ops for mailbox * @mbx: pointer to mailbox * @msg_data: handlers for mailbox events * * This function associates a set of message handling ops with a mailbox. **/ static s32 fm10k_mbx_register_handlers(struct fm10k_mbx_info *mbx, const struct fm10k_msg_data *msg_data) { /* validate layout of handlers before assigning them */ if (fm10k_mbx_validate_handlers(msg_data)) return FM10K_ERR_PARAM; /* initialize the message handlers */ mbx->msg_data = msg_data; return 0; } /** * fm10k_pfvf_mbx_init - Initialize mailbox memory for PF/VF mailbox * @hw: pointer to hardware structure * @mbx: pointer to mailbox * @msg_data: handlers for mailbox events * @id: ID reference for PF as it supports up to 64 PF/VF mailboxes * * This function initializes the mailbox for use. It will split the * buffer provided an use that th populate both the Tx and Rx FIFO by * evenly splitting it. In order to allow for easy masking of head/tail * the value reported in size must be a power of 2 and is reported in * DWORDs, not bytes. Any invalid values will cause the mailbox to return * error. **/ s32 fm10k_pfvf_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, const struct fm10k_msg_data *msg_data, u8 id) { /* initialize registers */ switch (hw->mac.type) { case fm10k_mac_vf: mbx->mbx_reg = FM10K_VFMBX; mbx->mbmem_reg = FM10K_VFMBMEM(FM10K_VFMBMEM_VF_XOR); break; case fm10k_mac_pf: /* there are only 64 VF <-> PF mailboxes */ if (id < 64) { mbx->mbx_reg = FM10K_MBX(id); mbx->mbmem_reg = FM10K_MBMEM_VF(id, 0); break; } /* fallthough */ default: return FM10K_MBX_ERR_NO_MBX; } /* start out in closed state */ mbx->state = FM10K_STATE_CLOSED; /* validate layout of handlers before assigning them */ if (fm10k_mbx_validate_handlers(msg_data)) return FM10K_ERR_PARAM; /* initialize the message handlers */ mbx->msg_data = msg_data; /* start mailbox as timed out and let the reset_hw call * set the timeout value to begin communications */ mbx->timeout = 0; mbx->udelay = FM10K_MBX_INIT_DELAY; /* initialize tail and head */ mbx->tail = 1; mbx->head = 1; /* initialize CRC seeds */ mbx->local = FM10K_MBX_CRC_SEED; mbx->remote = FM10K_MBX_CRC_SEED; /* Split buffer for use by Tx/Rx FIFOs */ mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; mbx->mbmem_len = FM10K_VFMBMEM_VF_XOR; /* initialize the FIFOs, sizes are in 4 byte increments */ fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE); fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE], FM10K_MBX_RX_BUFFER_SIZE); /* initialize function pointers */ mbx->ops.connect = fm10k_mbx_connect; mbx->ops.disconnect = fm10k_mbx_disconnect; mbx->ops.rx_ready = fm10k_mbx_rx_ready; mbx->ops.tx_ready = fm10k_mbx_tx_ready; mbx->ops.tx_complete = fm10k_mbx_tx_complete; mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx; mbx->ops.process = fm10k_mbx_process; mbx->ops.register_handlers = fm10k_mbx_register_handlers; return 0; } /** * fm10k_sm_mbx_create_data_hdr - Generate a mailbox header for local FIFO * @mbx: pointer to mailbox * * This function returns a connection mailbox header **/ static void fm10k_sm_mbx_create_data_hdr(struct fm10k_mbx_info *mbx) { if (mbx->tail_len) mbx->mbx_lock |= FM10K_MBX_REQ; mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) | FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) | FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD); } /** * fm10k_sm_mbx_create_connect_hdr - Generate a mailbox header for local FIFO * @mbx: pointer to mailbox * @err: error flags to report if any * * This function returns a connection mailbox header **/ static void fm10k_sm_mbx_create_connect_hdr(struct fm10k_mbx_info *mbx, u8 err) { if (mbx->local) mbx->mbx_lock |= FM10K_MBX_REQ; mbx->mbx_hdr = FM10K_MSG_HDR_FIELD_SET(mbx->tail, SM_TAIL) | FM10K_MSG_HDR_FIELD_SET(mbx->remote, SM_VER) | FM10K_MSG_HDR_FIELD_SET(mbx->head, SM_HEAD) | FM10K_MSG_HDR_FIELD_SET(err, SM_ERR); } /** * fm10k_sm_mbx_connect_reset - Reset following request for reset * @mbx: pointer to mailbox * * This function resets the mailbox to a just connected state **/ static void fm10k_sm_mbx_connect_reset(struct fm10k_mbx_info *mbx) { /* flush any uncompleted work */ fm10k_mbx_reset_work(mbx); /* set local version to max and remote version to 0 */ mbx->local = FM10K_SM_MBX_VERSION; mbx->remote = 0; /* initialize tail and head */ mbx->tail = 1; mbx->head = 1; /* reset state back to connect */ mbx->state = FM10K_STATE_CONNECT; } /** * fm10k_sm_mbx_connect - Start switch manager mailbox connection * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will initiate a mailbox connection with the switch * manager. To do this it will first disconnect the mailbox, and then * reconnect it in order to complete a reset of the mailbox. * * This function will return an error if the mailbox has not been initiated * or is currently in use. **/ static s32 fm10k_sm_mbx_connect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { /* we cannot connect an uninitialized mailbox */ if (!mbx->rx.buffer) return FM10K_MBX_ERR_NO_SPACE; /* we cannot connect an already connected mailbox */ if (mbx->state != FM10K_STATE_CLOSED) return FM10K_MBX_ERR_BUSY; /* mailbox timeout can now become active */ mbx->timeout = FM10K_MBX_INIT_TIMEOUT; /* Place mbx in ready to connect state */ mbx->state = FM10K_STATE_CONNECT; mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; /* reset interface back to connect */ fm10k_sm_mbx_connect_reset(mbx); /* enable interrupt and notify other party of new message */ mbx->mbx_lock = FM10K_MBX_REQ_INTERRUPT | FM10K_MBX_ACK_INTERRUPT | FM10K_MBX_INTERRUPT_ENABLE; /* generate and load connect header into mailbox */ fm10k_sm_mbx_create_connect_hdr(mbx, 0); fm10k_mbx_write(hw, mbx); /* enable interrupt and notify other party of new message */ return 0; } /** * fm10k_sm_mbx_disconnect - Shutdown mailbox connection * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will shut down the mailbox. It places the mailbox first * in the disconnect state, it then allows up to a predefined timeout for * the mailbox to transition to close on its own. If this does not occur * then the mailbox will be forced into the closed state. * * Any mailbox transactions not completed before calling this function * are not guaranteed to complete and may be dropped. **/ static void fm10k_sm_mbx_disconnect(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { int timeout = mbx->timeout ? FM10K_MBX_DISCONNECT_TIMEOUT : 0; /* Place mbx in ready to disconnect state */ mbx->state = FM10K_STATE_DISCONNECT; /* trigger interrupt to start shutdown process */ fm10k_write_reg(hw, mbx->mbx_reg, FM10K_MBX_REQ | FM10K_MBX_INTERRUPT_DISABLE); do { udelay(FM10K_MBX_POLL_DELAY); mbx->ops.process(hw, mbx); timeout -= FM10K_MBX_POLL_DELAY; } while ((timeout > 0) && (mbx->state != FM10K_STATE_CLOSED)); /* in case we didn't close just force the mailbox into shutdown */ mbx->state = FM10K_STATE_CLOSED; mbx->remote = 0; fm10k_mbx_reset_work(mbx); fm10k_mbx_update_max_size(mbx, 0); fm10k_write_reg(hw, mbx->mbmem_reg, 0); } /** * fm10k_mbx_validate_fifo_hdr - Validate fields in the remote FIFO header * @mbx: pointer to mailbox * * This function will parse up the fields in the mailbox header and return * an error if the header contains any of a number of invalid configurations * including unrecognized offsets or version numbers. **/ static s32 fm10k_sm_mbx_validate_fifo_hdr(struct fm10k_mbx_info *mbx) { const u32 *hdr = &mbx->mbx_hdr; u16 tail, head, ver; tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL); ver = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_VER); head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD); switch (ver) { case 0: break; case FM10K_SM_MBX_VERSION: if (!head || head > FM10K_SM_MBX_FIFO_LEN) return FM10K_MBX_ERR_HEAD; if (!tail || tail > FM10K_SM_MBX_FIFO_LEN) return FM10K_MBX_ERR_TAIL; if (mbx->tail < head) head += mbx->mbmem_len - 1; if (tail < mbx->head) tail += mbx->mbmem_len - 1; if (fm10k_mbx_index_len(mbx, head, mbx->tail) > mbx->tail_len) return FM10K_MBX_ERR_HEAD; if (fm10k_mbx_index_len(mbx, mbx->head, tail) < mbx->mbmem_len) break; return FM10K_MBX_ERR_TAIL; default: return FM10K_MBX_ERR_SRC; } return 0; } /** * fm10k_sm_mbx_process_error - Process header with error flag set * @mbx: pointer to mailbox * * This function is meant to respond to a request where the error flag * is set. As a result we will terminate a connection if one is present * and fall back into the reset state with a connection header of version * 0 (RESET). **/ static void fm10k_sm_mbx_process_error(struct fm10k_mbx_info *mbx) { const enum fm10k_mbx_state state = mbx->state; switch (state) { case FM10K_STATE_DISCONNECT: /* if there is an error just disconnect */ mbx->remote = 0; break; case FM10K_STATE_OPEN: /* flush any uncompleted work */ fm10k_sm_mbx_connect_reset(mbx); break; case FM10K_STATE_CONNECT: /* try connnecting at lower version */ if (mbx->remote) { while (mbx->local > 1) mbx->local--; mbx->remote = 0; } break; default: break; } fm10k_sm_mbx_create_connect_hdr(mbx, 0); } /** * fm10k_sm_mbx_create_error_message - Process an error in FIFO hdr * @mbx: pointer to mailbox * @err: local error encountered * * This function will interpret the error provided by err, and based on * that it may set the error bit in the local message header **/ static void fm10k_sm_mbx_create_error_msg(struct fm10k_mbx_info *mbx, s32 err) { /* only generate an error message for these types */ switch (err) { case FM10K_MBX_ERR_TAIL: case FM10K_MBX_ERR_HEAD: case FM10K_MBX_ERR_SRC: case FM10K_MBX_ERR_SIZE: case FM10K_MBX_ERR_RSVD0: break; default: return; } /* process it as though we received an error, and send error reply */ fm10k_sm_mbx_process_error(mbx); fm10k_sm_mbx_create_connect_hdr(mbx, 1); } /** * fm10k_sm_mbx_receive - Take message from Rx mailbox FIFO and put it in Rx * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will dequeue one message from the Rx switch manager mailbox * FIFO and place it in the Rx mailbox FIFO for processing by software. **/ static s32 fm10k_sm_mbx_receive(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 tail) { /* reduce length by 1 to convert to a mask */ u16 mbmem_len = mbx->mbmem_len - 1; s32 err; /* push tail in front of head */ if (tail < mbx->head) tail += mbmem_len; /* copy data to the Rx FIFO */ err = fm10k_mbx_push_tail(hw, mbx, tail); if (err < 0) return err; /* process messages if we have received any */ fm10k_mbx_dequeue_rx(hw, mbx); /* guarantee head aligns with the end of the last message */ mbx->head = fm10k_mbx_head_sub(mbx, mbx->pushed); mbx->pushed = 0; /* clear any extra bits left over since index adds 1 extra bit */ if (mbx->head > mbmem_len) mbx->head -= mbmem_len; return err; } /** * fm10k_sm_mbx_transmit - Take message from Tx and put it in Tx mailbox FIFO * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will dequeue one message from the Tx mailbox FIFO and place * it in the Tx switch manager mailbox FIFO for processing by hardware. **/ static void fm10k_sm_mbx_transmit(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 head) { struct fm10k_mbx_fifo *fifo = &mbx->tx; /* reduce length by 1 to convert to a mask */ u16 mbmem_len = mbx->mbmem_len - 1; u16 tail_len, len = 0; u32 *msg; /* push head behind tail */ if (mbx->tail < head) head += mbmem_len; fm10k_mbx_pull_head(hw, mbx, head); /* determine msg aligned offset for end of buffer */ do { msg = fifo->buffer + fm10k_fifo_head_offset(fifo, len); tail_len = len; len += FM10K_TLV_DWORD_LEN(*msg); } while ((len <= mbx->tail_len) && (len < mbmem_len)); /* guarantee we stop on a message boundary */ if (mbx->tail_len > tail_len) { mbx->tail = fm10k_mbx_tail_sub(mbx, mbx->tail_len - tail_len); mbx->tail_len = tail_len; } /* clear any extra bits left over since index adds 1 extra bit */ if (mbx->tail > mbmem_len) mbx->tail -= mbmem_len; } /** * fm10k_sm_mbx_create_reply - Generate reply based on state and remote head * @mbx: pointer to mailbox * @head: acknowledgement number * * This function will generate an outgoing message based on the current * mailbox state and the remote fifo head. It will return the length * of the outgoing message excluding header on success, and a negative value * on error. **/ static void fm10k_sm_mbx_create_reply(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, u16 head) { switch (mbx->state) { case FM10K_STATE_OPEN: case FM10K_STATE_DISCONNECT: /* flush out Tx data */ fm10k_sm_mbx_transmit(hw, mbx, head); /* generate new header based on data */ if (mbx->tail_len || (mbx->state == FM10K_STATE_OPEN)) { fm10k_sm_mbx_create_data_hdr(mbx); } else { mbx->remote = 0; fm10k_sm_mbx_create_connect_hdr(mbx, 0); } break; case FM10K_STATE_CONNECT: case FM10K_STATE_CLOSED: fm10k_sm_mbx_create_connect_hdr(mbx, 0); break; default: break; } } /** * fm10k_sm_mbx_process_reset - Process header with version == 0 (RESET) * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function is meant to respond to a request where the version data * is set to 0. As such we will either terminate the connection or go * into the connect state in order to re-establish the connection. This * function can also be used to respond to an error as the connection * resetting would also be a means of dealing with errors. **/ static void fm10k_sm_mbx_process_reset(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const enum fm10k_mbx_state state = mbx->state; switch (state) { case FM10K_STATE_DISCONNECT: /* drop remote connections and disconnect */ mbx->state = FM10K_STATE_CLOSED; mbx->remote = 0; mbx->local = 0; break; case FM10K_STATE_OPEN: /* flush any incomplete work */ fm10k_sm_mbx_connect_reset(mbx); break; case FM10K_STATE_CONNECT: /* Update remote value to match local value */ mbx->remote = mbx->local; default: break; } fm10k_sm_mbx_create_reply(hw, mbx, mbx->tail); } /** * fm10k_sm_mbx_process_version_1 - Process header with version == 1 * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function is meant to process messages received when the remote * mailbox is active. **/ static s32 fm10k_sm_mbx_process_version_1(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { const u32 *hdr = &mbx->mbx_hdr; u16 head, tail; s32 len; /* pull all fields needed for verification */ tail = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_TAIL); head = FM10K_MSG_HDR_FIELD_GET(*hdr, SM_HEAD); /* if we are in connect and wanting version 1 then start up and go */ if (mbx->state == FM10K_STATE_CONNECT) { if (!mbx->remote) goto send_reply; if (mbx->remote != 1) return FM10K_MBX_ERR_SRC; mbx->state = FM10K_STATE_OPEN; } do { /* abort on message size errors */ len = fm10k_sm_mbx_receive(hw, mbx, tail); if (len < 0) return len; /* continue until we have flushed the Rx FIFO */ } while (len); send_reply: fm10k_sm_mbx_create_reply(hw, mbx, head); return 0; } /** * fm10k_sm_mbx_process - Process mailbox switch mailbox interrupt * @hw: pointer to hardware structure * @mbx: pointer to mailbox * * This function will process incoming mailbox events and generate mailbox * replies. It will return a value indicating the number of DWORDs * transmitted excluding header on success or a negative value on error. **/ static s32 fm10k_sm_mbx_process(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx) { s32 err; /* we do not read mailbox if closed */ if (mbx->state == FM10K_STATE_CLOSED) return 0; /* retrieve data from switch manager */ err = fm10k_mbx_read(hw, mbx); if (err) return err; err = fm10k_sm_mbx_validate_fifo_hdr(mbx); if (err < 0) goto fifo_err; if (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_ERR)) { fm10k_sm_mbx_process_error(mbx); goto fifo_err; } switch (FM10K_MSG_HDR_FIELD_GET(mbx->mbx_hdr, SM_VER)) { case 0: fm10k_sm_mbx_process_reset(hw, mbx); break; case FM10K_SM_MBX_VERSION: err = fm10k_sm_mbx_process_version_1(hw, mbx); break; } fifo_err: if (err < 0) fm10k_sm_mbx_create_error_msg(mbx, err); /* report data to switch manager */ fm10k_mbx_write(hw, mbx); return err; } /** * fm10k_sm_mbx_init - Initialize mailbox memory for PF/SM mailbox * @hw: pointer to hardware structure * @mbx: pointer to mailbox * @msg_data: handlers for mailbox events * * This function for now is used to stub out the PF/SM mailbox **/ s32 fm10k_sm_mbx_init(struct fm10k_hw *hw, struct fm10k_mbx_info *mbx, const struct fm10k_msg_data *msg_data) { mbx->mbx_reg = FM10K_GMBX; mbx->mbmem_reg = FM10K_MBMEM_PF(0); /* start out in closed state */ mbx->state = FM10K_STATE_CLOSED; /* validate layout of handlers before assigning them */ if (fm10k_mbx_validate_handlers(msg_data)) return FM10K_ERR_PARAM; /* initialize the message handlers */ mbx->msg_data = msg_data; /* start mailbox as timed out and let the reset_hw call * set the timeout value to begin communications */ mbx->timeout = 0; mbx->udelay = FM10K_MBX_INIT_DELAY; /* Split buffer for use by Tx/Rx FIFOs */ mbx->max_size = FM10K_MBX_MSG_MAX_SIZE; mbx->mbmem_len = FM10K_MBMEM_PF_XOR; /* initialize the FIFOs, sizes are in 4 byte increments */ fm10k_fifo_init(&mbx->tx, mbx->buffer, FM10K_MBX_TX_BUFFER_SIZE); fm10k_fifo_init(&mbx->rx, &mbx->buffer[FM10K_MBX_TX_BUFFER_SIZE], FM10K_MBX_RX_BUFFER_SIZE); /* initialize function pointers */ mbx->ops.connect = fm10k_sm_mbx_connect; mbx->ops.disconnect = fm10k_sm_mbx_disconnect; mbx->ops.rx_ready = fm10k_mbx_rx_ready; mbx->ops.tx_ready = fm10k_mbx_tx_ready; mbx->ops.tx_complete = fm10k_mbx_tx_complete; mbx->ops.enqueue_tx = fm10k_mbx_enqueue_tx; mbx->ops.process = fm10k_sm_mbx_process; mbx->ops.register_handlers = fm10k_mbx_register_handlers; return 0; }