1 /* Intel(R) Ethernet Switch Host Interface Driver
2 * Copyright(c) 2013 - 2016 Intel Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * The full GNU General Public License is included in this distribution in
14 * the file called "COPYING".
16 * Contact Information:
17 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
18 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 /* forward declaration */
25 struct fm10k_mbx_info;
27 #include "fm10k_type.h"
28 #include "fm10k_tlv.h"
30 /* PF Mailbox Registers */
31 #define FM10K_MBMEM(_n) ((_n) + 0x18000)
32 #define FM10K_MBMEM_VF(_n, _m) (((_n) * 0x10) + (_m) + 0x18000)
33 #define FM10K_MBMEM_SM(_n) ((_n) + 0x18400)
34 #define FM10K_MBMEM_PF(_n) ((_n) + 0x18600)
35 /* XOR provides means of switching from Tx to Rx FIFO */
36 #define FM10K_MBMEM_PF_XOR (FM10K_MBMEM_SM(0) ^ FM10K_MBMEM_PF(0))
37 #define FM10K_MBX(_n) ((_n) + 0x18800)
38 #define FM10K_MBX_REQ 0x00000002
39 #define FM10K_MBX_ACK 0x00000004
40 #define FM10K_MBX_REQ_INTERRUPT 0x00000008
41 #define FM10K_MBX_ACK_INTERRUPT 0x00000010
42 #define FM10K_MBX_INTERRUPT_ENABLE 0x00000020
43 #define FM10K_MBX_INTERRUPT_DISABLE 0x00000040
44 #define FM10K_MBX_GLOBAL_REQ_INTERRUPT 0x00000200
45 #define FM10K_MBX_GLOBAL_ACK_INTERRUPT 0x00000400
46 #define FM10K_MBICR(_n) ((_n) + 0x18840)
47 #define FM10K_GMBX 0x18842
49 /* VF Mailbox Registers */
50 #define FM10K_VFMBX 0x00010
51 #define FM10K_VFMBMEM(_n) ((_n) + 0x00020)
52 #define FM10K_VFMBMEM_LEN 16
53 #define FM10K_VFMBMEM_VF_XOR (FM10K_VFMBMEM_LEN / 2)
56 #define FM10K_MBX_DISCONNECT_TIMEOUT 500
57 #define FM10K_MBX_POLL_DELAY 19
58 #define FM10K_MBX_INT_DELAY 20
60 /* PF/VF Mailbox state machine
62 * +----------+ connect() +----------+
63 * | CLOSED | --------------> | CONNECT |
64 * +----------+ +----------+
66 * | rcv: rcv: | | rcv:
67 * | Connect Disconnect | | Connect
68 * | Disconnect Error | | Data
71 * +----------+ disconnect() +----------+
72 * |DISCONNECT| <-------------- | OPEN |
73 * +----------+ +----------+
75 * The diagram above describes the PF/VF mailbox state machine. There
76 * are four main states to this machine.
77 * Closed: This state represents a mailbox that is in a standby state
78 * with interrupts disabled. In this state the mailbox should not
79 * read the mailbox or write any data. The only means of exiting
80 * this state is for the system to make the connect() call for the
81 * mailbox, it will then transition to the connect state.
82 * Connect: In this state the mailbox is seeking a connection. It will
83 * post a connect message with no specified destination and will
84 * wait for a reply from the other side of the mailbox. This state
85 * is exited when either a connect with the local mailbox as the
86 * destination is received or when a data message is received with
87 * a valid sequence number.
88 * Open: In this state the mailbox is able to transfer data between the local
89 * entity and the remote. It will fall back to connect in the event of
90 * receiving either an error message, or a disconnect message. It will
91 * transition to disconnect on a call to disconnect();
92 * Disconnect: In this state the mailbox is attempting to gracefully terminate
93 * the connection. It will do so at the first point where it knows
94 * that the remote endpoint is either done sending, or when the
95 * remote endpoint has fallen back into connect.
97 enum fm10k_mbx_state {
101 FM10K_STATE_DISCONNECT,
104 /* PF/VF Mailbox header format
106 * 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
107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
108 * | Size/Err_no/CRC | Rsvd0 | Head | Tail | Type |
109 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
111 * The layout above describes the format for the header used in the PF/VF
112 * mailbox. The header is broken out into the following fields:
113 * Type: There are 4 supported message types
114 * 0x8: Data header - used to transport message data
115 * 0xC: Connect header - used to establish connection
116 * 0xD: Disconnect header - used to tear down a connection
117 * 0xE: Error header - used to address message exceptions
118 * Tail: Tail index for local FIFO
119 * Tail index actually consists of two parts. The MSB of
120 * the head is a loop tracker, it is 0 on an even numbered
121 * loop through the FIFO, and 1 on the odd numbered loops.
122 * To get the actual mailbox offset based on the tail it
123 * is necessary to add bit 3 to bit 0 and clear bit 3. This
124 * gives us a valid range of 0x1 - 0xE.
125 * Head: Head index for remote FIFO
126 * Head index follows the same format as the tail index.
127 * Rsvd0: Reserved 0 portion of the mailbox header
128 * CRC: Running CRC for all data since connect plus current message header
129 * Size: Maximum message size - Applies only to connect headers
130 * The maximum message size is provided during connect to avoid
131 * jamming the mailbox with messages that do not fit.
132 * Err_no: Error number - Applies only to error headers
133 * The error number provides an indication of the type of error
137 /* macros for retrieving and setting header values */
138 #define FM10K_MSG_HDR_MASK(name) \
139 ((0x1u << FM10K_MSG_##name##_SIZE) - 1)
140 #define FM10K_MSG_HDR_FIELD_SET(value, name) \
141 (((u32)(value) & FM10K_MSG_HDR_MASK(name)) << FM10K_MSG_##name##_SHIFT)
142 #define FM10K_MSG_HDR_FIELD_GET(value, name) \
143 ((u16)((value) >> FM10K_MSG_##name##_SHIFT) & FM10K_MSG_HDR_MASK(name))
145 /* offsets shared between all headers */
146 #define FM10K_MSG_TYPE_SHIFT 0
147 #define FM10K_MSG_TYPE_SIZE 4
148 #define FM10K_MSG_TAIL_SHIFT 4
149 #define FM10K_MSG_TAIL_SIZE 4
150 #define FM10K_MSG_HEAD_SHIFT 8
151 #define FM10K_MSG_HEAD_SIZE 4
152 #define FM10K_MSG_RSVD0_SHIFT 12
153 #define FM10K_MSG_RSVD0_SIZE 4
155 /* offsets for data/disconnect headers */
156 #define FM10K_MSG_CRC_SHIFT 16
157 #define FM10K_MSG_CRC_SIZE 16
159 /* offsets for connect headers */
160 #define FM10K_MSG_CONNECT_SIZE_SHIFT 16
161 #define FM10K_MSG_CONNECT_SIZE_SIZE 16
163 /* offsets for error headers */
164 #define FM10K_MSG_ERR_NO_SHIFT 16
165 #define FM10K_MSG_ERR_NO_SIZE 16
167 enum fm10k_msg_type {
168 FM10K_MSG_DATA = 0x8,
169 FM10K_MSG_CONNECT = 0xC,
170 FM10K_MSG_DISCONNECT = 0xD,
171 FM10K_MSG_ERROR = 0xE,
174 /* HNI/SM Mailbox FIFO format
176 * 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
177 * +-------+-----------------------+-------+-----------------------+
178 * | Error | Remote Head |Version| Local Tail |
179 * +-------+-----------------------+-------+-----------------------+
181 * . Local FIFO Data .
183 * +-------+-----------------------+-------+-----------------------+
185 * The layout above describes the format for the FIFOs used by the host
186 * network interface and the switch manager to communicate messages back
187 * and forth. Both the HNI and the switch maintain one such FIFO. The
188 * layout in memory has the switch manager FIFO followed immediately by
189 * the HNI FIFO. For this reason I am using just the pointer to the
190 * HNI FIFO in the mailbox ops as the offset between the two is fixed.
192 * The header for the FIFO is broken out into the following fields:
193 * Local Tail: Offset into FIFO region for next DWORD to write.
194 * Version: Version info for mailbox, only values of 0/1 are supported.
195 * Remote Head: Offset into remote FIFO to indicate how much we have read.
196 * Error: Error indication, values TBD.
199 /* version number for switch manager mailboxes */
200 #define FM10K_SM_MBX_VERSION 1
201 #define FM10K_SM_MBX_FIFO_LEN (FM10K_MBMEM_PF_XOR - 1)
203 /* offsets shared between all SM FIFO headers */
204 #define FM10K_MSG_SM_TAIL_SHIFT 0
205 #define FM10K_MSG_SM_TAIL_SIZE 12
206 #define FM10K_MSG_SM_VER_SHIFT 12
207 #define FM10K_MSG_SM_VER_SIZE 4
208 #define FM10K_MSG_SM_HEAD_SHIFT 16
209 #define FM10K_MSG_SM_HEAD_SIZE 12
210 #define FM10K_MSG_SM_ERR_SHIFT 28
211 #define FM10K_MSG_SM_ERR_SIZE 4
213 /* All error messages returned by mailbox functions
214 * The value -511 is 0xFE01 in hex. The idea is to order the errors
215 * from 0xFE01 - 0xFEFF so error codes are easily visible in the mailbox
216 * messages. This also helps to avoid error number collisions as Linux
217 * doesn't appear to use error numbers 256 - 511.
219 #define FM10K_MBX_ERR(_n) ((_n) - 512)
220 #define FM10K_MBX_ERR_NO_MBX FM10K_MBX_ERR(0x01)
221 #define FM10K_MBX_ERR_NO_SPACE FM10K_MBX_ERR(0x03)
222 #define FM10K_MBX_ERR_TAIL FM10K_MBX_ERR(0x05)
223 #define FM10K_MBX_ERR_HEAD FM10K_MBX_ERR(0x06)
224 #define FM10K_MBX_ERR_SRC FM10K_MBX_ERR(0x08)
225 #define FM10K_MBX_ERR_TYPE FM10K_MBX_ERR(0x09)
226 #define FM10K_MBX_ERR_SIZE FM10K_MBX_ERR(0x0B)
227 #define FM10K_MBX_ERR_BUSY FM10K_MBX_ERR(0x0C)
228 #define FM10K_MBX_ERR_RSVD0 FM10K_MBX_ERR(0x0E)
229 #define FM10K_MBX_ERR_CRC FM10K_MBX_ERR(0x0F)
231 #define FM10K_MBX_CRC_SEED 0xFFFF
233 struct fm10k_mbx_ops {
234 s32 (*connect)(struct fm10k_hw *, struct fm10k_mbx_info *);
235 void (*disconnect)(struct fm10k_hw *, struct fm10k_mbx_info *);
236 bool (*rx_ready)(struct fm10k_mbx_info *);
237 bool (*tx_ready)(struct fm10k_mbx_info *, u16);
238 bool (*tx_complete)(struct fm10k_mbx_info *);
239 s32 (*enqueue_tx)(struct fm10k_hw *, struct fm10k_mbx_info *,
241 s32 (*process)(struct fm10k_hw *, struct fm10k_mbx_info *);
242 s32 (*register_handlers)(struct fm10k_mbx_info *,
243 const struct fm10k_msg_data *);
246 struct fm10k_mbx_fifo {
253 /* size of buffer to be stored in mailbox for FIFOs */
254 #define FM10K_MBX_TX_BUFFER_SIZE 512
255 #define FM10K_MBX_RX_BUFFER_SIZE 128
256 #define FM10K_MBX_BUFFER_SIZE \
257 (FM10K_MBX_TX_BUFFER_SIZE + FM10K_MBX_RX_BUFFER_SIZE)
259 /* minimum and maximum message size in dwords */
260 #define FM10K_MBX_MSG_MAX_SIZE \
261 ((FM10K_MBX_TX_BUFFER_SIZE - 1) & (FM10K_MBX_RX_BUFFER_SIZE - 1))
262 #define FM10K_VFMBX_MSG_MTU ((FM10K_VFMBMEM_LEN / 2) - 1)
264 #define FM10K_MBX_INIT_TIMEOUT 2000 /* number of retries on mailbox */
265 #define FM10K_MBX_INIT_DELAY 500 /* microseconds between retries */
267 struct fm10k_mbx_info {
268 /* function pointers for mailbox operations */
269 struct fm10k_mbx_ops ops;
270 const struct fm10k_msg_data *msg_data;
273 struct fm10k_mbx_fifo rx;
274 struct fm10k_mbx_fifo tx;
276 /* delay for handling timeouts */
280 /* mailbox state info */
281 u32 mbx_reg, mbmem_reg, mbx_lock, mbx_hdr;
282 u16 max_size, mbmem_len;
283 u16 tail, tail_len, pulled;
284 u16 head, head_len, pushed;
286 enum fm10k_mbx_state state;
288 /* result of last mailbox test */
302 /* Buffer to store messages */
303 u32 buffer[FM10K_MBX_BUFFER_SIZE];
306 s32 fm10k_pfvf_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
307 const struct fm10k_msg_data *, u8);
308 s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *,
309 const struct fm10k_msg_data *);
311 #endif /* _FM10K_MBX_H_ */