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Message-Id: <1411471017-28213-7-git-send-email-jeffrey.t.kirsher@intel.com>
Date: Tue, 23 Sep 2014 04:16:34 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Alexander Duyck <alexander.h.duyck@...el.com>,
netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next v3 06/29] fm10k: Implement PF <-> SM mailbox operations
From: Alexander Duyck <alexander.h.duyck@...el.com>
This patch adds support for the mailbox that connects the PF to the Switch
Management entity. This mailbox will pass TLV formatted messages between
the two entities by using a pair of shared ring buffers.
The primary use of the mailbox is to configure L2 forwarding addresses,
VLANs, and general resource allocation from the switch.
Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/fm10k/Makefile | 2 +-
drivers/net/ethernet/intel/fm10k/fm10k_mbx.c | 1351 ++++++++++++++++++++++++++
drivers/net/ethernet/intel/fm10k/fm10k_mbx.h | 3 +
3 files changed, 1355 insertions(+), 1 deletion(-)
create mode 100644 drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
diff --git a/drivers/net/ethernet/intel/fm10k/Makefile b/drivers/net/ethernet/intel/fm10k/Makefile
index 1052808..6642611 100644
--- a/drivers/net/ethernet/intel/fm10k/Makefile
+++ b/drivers/net/ethernet/intel/fm10k/Makefile
@@ -28,4 +28,4 @@
obj-$(CONFIG_FM10K) += fm10k.o
fm10k-objs := fm10k_main.o fm10k_pci.o \
- fm10k_tlv.o
+ fm10k_mbx.o fm10k_tlv.o
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
new file mode 100644
index 0000000..2609847
--- /dev/null
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.c
@@ -0,0 +1,1351 @@
+/* Intel Ethernet Switch Host Interface Driver
+ * Copyright(c) 2013 - 2014 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 <e1000-devel@...ts.sourceforge.net>
+ * 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 indicies 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 indicies 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 seciton 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 seciton 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 acknowlegment 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;
+}
+
+/**
+ * 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 trhead 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 recepient of change */
+ fm10k_write_reg(hw, mbmem, mbx->mbx_hdr);
+
+ /* write mailbox to sent 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_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_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_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;
+
+ /* initalize 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;
+}
diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_mbx.h b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.h
index cb7aa4a..f5ba86f 100644
--- a/drivers/net/ethernet/intel/fm10k/fm10k_mbx.h
+++ b/drivers/net/ethernet/intel/fm10k/fm10k_mbx.h
@@ -237,4 +237,7 @@ struct fm10k_mbx_info {
u32 buffer[FM10K_MBX_BUFFER_SIZE];
};
+s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
+ const struct fm10k_msg_data *);
+
#endif /* _FM10K_MBX_H_ */
--
1.9.3
--
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