/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright(c) 2013 - 2018 Intel Corporation. */
#ifndef _FM10K_MBX_H_
#define _FM10K_MBX_H_
/* forward declaration */
struct fm10k_mbx_info;
#include "fm10k_type.h"
#include "fm10k_tlv.h"
/* PF Mailbox Registers */
#define FM10K_MBMEM(_n) ((_n) + 0 x18000)
#define FM10K_MBMEM_VF(_n, _m) (((_n) * 0 x10) + (_m) + 0 x18000)
#define FM10K_MBMEM_SM(_n) ((_n) + 0 x18400)
#define FM10K_MBMEM_PF(_n) ((_n) + 0 x18600)
/* XOR provides means of switching from Tx to Rx FIFO */
#define FM10K_MBMEM_PF_XOR (FM10K_MBMEM_SM(0 ) ^ FM10K_MBMEM_PF(0 ))
#define FM10K_MBX(_n) ((_n) + 0 x18800)
#define FM10K_MBX_REQ 0 x00000002
#define FM10K_MBX_ACK 0 x00000004
#define FM10K_MBX_REQ_INTERRUPT 0 x00000008
#define FM10K_MBX_ACK_INTERRUPT 0 x00000010
#define FM10K_MBX_INTERRUPT_ENABLE 0 x00000020
#define FM10K_MBX_INTERRUPT_DISABLE 0 x00000040
#define FM10K_MBX_GLOBAL_REQ_INTERRUPT 0 x00000200
#define FM10K_MBX_GLOBAL_ACK_INTERRUPT 0 x00000400
#define FM10K_MBICR(_n) ((_n) + 0 x18840)
#define FM10K_GMBX 0 x18842
/* VF Mailbox Registers */
#define FM10K_VFMBX 0 x00010
#define FM10K_VFMBMEM(_n) ((_n) + 0 x00020)
#define FM10K_VFMBMEM_LEN 16
#define FM10K_VFMBMEM_VF_XOR (FM10K_VFMBMEM_LEN / 2 )
/* Delays/timeouts */
#define FM10K_MBX_DISCONNECT_TIMEOUT 500
#define FM10K_MBX_POLL_DELAY 19
#define FM10K_MBX_INT_DELAY 20
/* PF/VF Mailbox state machine
*
* + - - - - - - - - - - + connect ( ) + - - - - - - - - - - +
* | CLOSED | - - - - - - - - - - - - - - > | CONNECT |
* + - - - - - - - - - - + + - - - - - - - - - - +
* ^ ^ |
* | rcv : rcv : | | rcv :
* | Connect Disconnect | | Connect
* | Disconnect Error | | Data
* | | |
* | | V
* + - - - - - - - - - - + disconnect ( ) + - - - - - - - - - - +
* | DISCONNECT | < - - - - - - - - - - - - - - | OPEN |
* + - - - - - - - - - - + + - - - - - - - - - - +
*
* The diagram above describes the PF / VF mailbox state machine . There
* are four main states to this machine .
* Closed : This state represents a mailbox that is in a standby state
* with interrupts disabled . In this state the mailbox should not
* read the mailbox or write any data . The only means of exiting
* this state is for the system to make the connect ( ) call for the
* mailbox , it will then transition to the connect state .
* Connect : In this state the mailbox is seeking a connection . It will
* post a connect message with no specified destination and will
* wait for a reply from the other side of the mailbox . This state
* is exited when either a connect with the local mailbox as the
* destination is received or when a data message is received with
* a valid sequence number .
* Open : In this state the mailbox is able to transfer data between the local
* entity and the remote . It will fall back to connect in the event of
* receiving either an error message , or a disconnect message . It will
* transition to disconnect on a call to disconnect ( ) ;
* Disconnect : In this state the mailbox is attempting to gracefully terminate
* the connection . It will do so at the first point where it knows
* that the remote endpoint is either done sending , or when the
* remote endpoint has fallen back into connect .
*/
enum fm10k_mbx_state {
FM10K_STATE_CLOSED,
FM10K_STATE_CONNECT,
FM10K_STATE_OPEN,
FM10K_STATE_DISCONNECT,
};
/* PF/VF Mailbox header format
* 3 2 1 0
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - +
* | Size / Err_no / CRC | Rsvd0 | Head | Tail | Type |
* + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - + - +
*
* The layout above describes the format for the header used in the PF / VF
* mailbox . The header is broken out into the following fields :
* Type : There are 4 supported message types
* 0 x8 : Data header - used to transport message data
* 0 xC : Connect header - used to establish connection
* 0 xD : Disconnect header - used to tear down a connection
* 0 xE : Error header - used to address message exceptions
* Tail : Tail index for local FIFO
* Tail index actually consists of two parts . The MSB of
* the head is a loop tracker , it is 0 on an even numbered
* loop through the FIFO , and 1 on the odd numbered loops .
* To get the actual mailbox offset based on the tail it
* is necessary to add bit 3 to bit 0 and clear bit 3 . This
* gives us a valid range of 0 x1 - 0 xE .
* Head : Head index for remote FIFO
* Head index follows the same format as the tail index .
* Rsvd0 : Reserved 0 portion of the mailbox header
* CRC : Running CRC for all data since connect plus current message header
* Size : Maximum message size - Applies only to connect headers
* The maximum message size is provided during connect to avoid
* jamming the mailbox with messages that do not fit .
* Err_no : Error number - Applies only to error headers
* The error number provides an indication of the type of error
* experienced .
*/
/* macros for retrieving and setting header values */
#define FM10K_MSG_HDR_MASK(name) \
((0 x1u << FM10K_MSG_## name## _SIZE) - 1 )
#define FM10K_MSG_HDR_FIELD_SET(value, name) \
(((u32)(value) & FM10K_MSG_HDR_MASK(name)) << FM10K_MSG_## name## _SHIFT)
#define FM10K_MSG_HDR_FIELD_GET(value, name) \
((u16)((value) >> FM10K_MSG_## name## _SHIFT) & FM10K_MSG_HDR_MASK(name))
/* offsets shared between all headers */
#define FM10K_MSG_TYPE_SHIFT 0
#define FM10K_MSG_TYPE_SIZE 4
#define FM10K_MSG_TAIL_SHIFT 4
#define FM10K_MSG_TAIL_SIZE 4
#define FM10K_MSG_HEAD_SHIFT 8
#define FM10K_MSG_HEAD_SIZE 4
#define FM10K_MSG_RSVD0_SHIFT 12
#define FM10K_MSG_RSVD0_SIZE 4
/* offsets for data/disconnect headers */
#define FM10K_MSG_CRC_SHIFT 16
#define FM10K_MSG_CRC_SIZE 16
/* offsets for connect headers */
#define FM10K_MSG_CONNECT_SIZE_SHIFT 16
#define FM10K_MSG_CONNECT_SIZE_SIZE 16
/* offsets for error headers */
#define FM10K_MSG_ERR_NO_SHIFT 16
#define FM10K_MSG_ERR_NO_SIZE 16
enum fm10k_msg_type {
FM10K_MSG_DATA = 0 x8,
FM10K_MSG_CONNECT = 0 xC,
FM10K_MSG_DISCONNECT = 0 xD,
FM10K_MSG_ERROR = 0 xE,
};
/* HNI/SM Mailbox FIFO format
* 3 2 1 0
* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
* + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - +
* | Error | Remote Head | Version | Local Tail |
* + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - +
* | |
* . Local FIFO Data .
* . .
* + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - + - - - - - - - + - - - - - - - - - - - - - - - - - - - - - - - +
*
* The layout above describes the format for the FIFOs used by the host
* network interface and the switch manager to communicate messages back
* and forth . Both the HNI and the switch maintain one such FIFO . The
* layout in memory has the switch manager FIFO followed immediately by
* the HNI FIFO . For this reason I am using just the pointer to the
* HNI FIFO in the mailbox ops as the offset between the two is fixed .
*
* The header for the FIFO is broken out into the following fields :
* Local Tail : Offset into FIFO region for next DWORD to write .
* Version : Version info for mailbox , only values of 0 / 1 are supported .
* Remote Head : Offset into remote FIFO to indicate how much we have read .
* Error : Error indication , values TBD .
*/
/* version number for switch manager mailboxes */
#define FM10K_SM_MBX_VERSION 1
#define FM10K_SM_MBX_FIFO_LEN (FM10K_MBMEM_PF_XOR - 1 )
/* offsets shared between all SM FIFO headers */
#define FM10K_MSG_SM_TAIL_SHIFT 0
#define FM10K_MSG_SM_TAIL_SIZE 12
#define FM10K_MSG_SM_VER_SHIFT 12
#define FM10K_MSG_SM_VER_SIZE 4
#define FM10K_MSG_SM_HEAD_SHIFT 16
#define FM10K_MSG_SM_HEAD_SIZE 12
#define FM10K_MSG_SM_ERR_SHIFT 28
#define FM10K_MSG_SM_ERR_SIZE 4
/* All error messages returned by mailbox functions
* The value - 511 is 0 xFE01 in hex . The idea is to order the errors
* from 0 xFE01 - 0 xFEFF so error codes are easily visible in the mailbox
* messages . This also helps to avoid error number collisions as Linux
* doesn ' t appear to use error numbers 256 - 511 .
*/
#define FM10K_MBX_ERR(_n) ((_n) - 512 )
#define FM10K_MBX_ERR_NO_MBX FM10K_MBX_ERR(0 x01)
#define FM10K_MBX_ERR_NO_SPACE FM10K_MBX_ERR(0 x03)
#define FM10K_MBX_ERR_TAIL FM10K_MBX_ERR(0 x05)
#define FM10K_MBX_ERR_HEAD FM10K_MBX_ERR(0 x06)
#define FM10K_MBX_ERR_SRC FM10K_MBX_ERR(0 x08)
#define FM10K_MBX_ERR_TYPE FM10K_MBX_ERR(0 x09)
#define FM10K_MBX_ERR_SIZE FM10K_MBX_ERR(0 x0B)
#define FM10K_MBX_ERR_BUSY FM10K_MBX_ERR(0 x0C)
#define FM10K_MBX_ERR_RSVD0 FM10K_MBX_ERR(0 x0E)
#define FM10K_MBX_ERR_CRC FM10K_MBX_ERR(0 x0F)
#define FM10K_MBX_CRC_SEED 0 xFFFF
struct fm10k_mbx_ops {
s32 (*connect)(struct fm10k_hw *, struct fm10k_mbx_info *);
void (*disconnect)(struct fm10k_hw *, struct fm10k_mbx_info *);
bool (*rx_ready)(struct fm10k_mbx_info *);
bool (*tx_ready)(struct fm10k_mbx_info *, u16);
bool (*tx_complete)(struct fm10k_mbx_info *);
s32 (*enqueue_tx)(struct fm10k_hw *, struct fm10k_mbx_info *,
const u32 *);
s32 (*process)(struct fm10k_hw *, struct fm10k_mbx_info *);
s32 (*register_handlers)(struct fm10k_mbx_info *,
const struct fm10k_msg_data *);
};
struct fm10k_mbx_fifo {
u32 *buffer;
u16 head;
u16 tail;
u16 size;
};
/* size of buffer to be stored in mailbox for FIFOs */
#define FM10K_MBX_TX_BUFFER_SIZE 512
#define FM10K_MBX_RX_BUFFER_SIZE 128
#define FM10K_MBX_BUFFER_SIZE \
(FM10K_MBX_TX_BUFFER_SIZE + FM10K_MBX_RX_BUFFER_SIZE)
/* minimum and maximum message size in dwords */
#define FM10K_MBX_MSG_MAX_SIZE \
((FM10K_MBX_TX_BUFFER_SIZE - 1 ) & (FM10K_MBX_RX_BUFFER_SIZE - 1 ))
#define FM10K_VFMBX_MSG_MTU ((FM10K_VFMBMEM_LEN / 2 ) - 1 )
#define FM10K_MBX_INIT_TIMEOUT 2000 /* number of retries on mailbox */
#define FM10K_MBX_INIT_DELAY 500 /* microseconds between retries */
struct fm10k_mbx_info {
/* function pointers for mailbox operations */
struct fm10k_mbx_ops ops;
const struct fm10k_msg_data *msg_data;
/* message FIFOs */
struct fm10k_mbx_fifo rx;
struct fm10k_mbx_fifo tx;
/* delay for handling timeouts */
u32 timeout;
u32 udelay;
/* mailbox state info */
u32 mbx_reg, mbmem_reg, mbx_lock, mbx_hdr;
u16 max_size, mbmem_len;
u16 tail, tail_len, pulled;
u16 head, head_len, pushed;
u16 local, remote;
enum fm10k_mbx_state state;
/* result of last mailbox test */
s32 test_result;
/* statistics */
u64 tx_busy;
u64 tx_dropped;
u64 tx_messages;
u64 tx_dwords;
u64 tx_mbmem_pulled;
u64 rx_messages;
u64 rx_dwords;
u64 rx_mbmem_pushed;
u64 rx_parse_err;
/* Buffer to store messages */
u32 buffer[FM10K_MBX_BUFFER_SIZE];
};
s32 fm10k_pfvf_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
const struct fm10k_msg_data *, u8);
s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
const struct fm10k_msg_data *);
#endif /* _FM10K_MBX_H_ */
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