1 /* Intel Ethernet Switch Host Interface Driver 2 * Copyright(c) 2013 - 2014 Intel Corporation. 3 * 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. 7 * 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 11 * more details. 12 * 13 * The full GNU General Public License is included in this distribution in 14 * the file called "COPYING". 15 * 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 19 */ 20 21 #ifndef _FM10K_MBX_H_ 22 #define _FM10K_MBX_H_ 23 24 /* forward declaration */ 25 struct fm10k_mbx_info; 26 27 #include "fm10k_type.h" 28 #include "fm10k_tlv.h" 29 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_MBICR(_n) ((_n) + 0x18840) 45 #define FM10K_GMBX 0x18842 46 47 /* VF Mailbox Registers */ 48 #define FM10K_VFMBX 0x00010 49 #define FM10K_VFMBMEM(_n) ((_n) + 0x00020) 50 #define FM10K_VFMBMEM_LEN 16 51 #define FM10K_VFMBMEM_VF_XOR (FM10K_VFMBMEM_LEN / 2) 52 53 /* Delays/timeouts */ 54 #define FM10K_MBX_DISCONNECT_TIMEOUT 500 55 #define FM10K_MBX_POLL_DELAY 19 56 #define FM10K_MBX_INT_DELAY 20 57 58 /* PF/VF Mailbox state machine 59 * 60 * +----------+ connect() +----------+ 61 * | CLOSED | --------------> | CONNECT | 62 * +----------+ +----------+ 63 * ^ ^ | 64 * | rcv: rcv: | | rcv: 65 * | Connect Disconnect | | Connect 66 * | Disconnect Error | | Data 67 * | | | 68 * | | V 69 * +----------+ disconnect() +----------+ 70 * |DISCONNECT| <-------------- | OPEN | 71 * +----------+ +----------+ 72 * 73 * The diagram above describes the PF/VF mailbox state machine. There 74 * are four main states to this machine. 75 * Closed: This state represents a mailbox that is in a standby state 76 * with interrupts disabled. In this state the mailbox should not 77 * read the mailbox or write any data. The only means of exiting 78 * this state is for the system to make the connect() call for the 79 * mailbox, it will then transition to the connect state. 80 * Connect: In this state the mailbox is seeking a connection. It will 81 * post a connect message with no specified destination and will 82 * wait for a reply from the other side of the mailbox. This state 83 * is exited when either a connect with the local mailbox as the 84 * destination is received or when a data message is received with 85 * a valid sequence number. 86 * Open: In this state the mailbox is able to transfer data between the local 87 * entity and the remote. It will fall back to connect in the event of 88 * receiving either an error message, or a disconnect message. It will 89 * transition to disconnect on a call to disconnect(); 90 * Disconnect: In this state the mailbox is attempting to gracefully terminate 91 * the connection. It will do so at the first point where it knows 92 * that the remote endpoint is either done sending, or when the 93 * remote endpoint has fallen back into connect. 94 */ 95 enum fm10k_mbx_state { 96 FM10K_STATE_CLOSED, 97 FM10K_STATE_CONNECT, 98 FM10K_STATE_OPEN, 99 FM10K_STATE_DISCONNECT, 100 }; 101 102 /* PF/VF Mailbox header format 103 * 3 2 1 0 104 * 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 0 105 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 106 * | Size/Err_no/CRC | Rsvd0 | Head | Tail | Type | 107 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 108 * 109 * The layout above describes the format for the header used in the PF/VF 110 * mailbox. The header is broken out into the following fields: 111 * Type: There are 4 supported message types 112 * 0x8: Data header - used to transport message data 113 * 0xC: Connect header - used to establish connection 114 * 0xD: Disconnect header - used to tear down a connection 115 * 0xE: Error header - used to address message exceptions 116 * Tail: Tail index for local FIFO 117 * Tail index actually consists of two parts. The MSB of 118 * the head is a loop tracker, it is 0 on an even numbered 119 * loop through the FIFO, and 1 on the odd numbered loops. 120 * To get the actual mailbox offset based on the tail it 121 * is necessary to add bit 3 to bit 0 and clear bit 3. This 122 * gives us a valid range of 0x1 - 0xE. 123 * Head: Head index for remote FIFO 124 * Head index follows the same format as the tail index. 125 * Rsvd0: Reserved 0 portion of the mailbox header 126 * CRC: Running CRC for all data since connect plus current message header 127 * Size: Maximum message size - Applies only to connect headers 128 * The maximum message size is provided during connect to avoid 129 * jamming the mailbox with messages that do not fit. 130 * Err_no: Error number - Applies only to error headers 131 * The error number provides a indication of the type of error 132 * experienced. 133 */ 134 135 /* macros for retriving and setting header values */ 136 #define FM10K_MSG_HDR_MASK(name) \ 137 ((0x1u << FM10K_MSG_##name##_SIZE) - 1) 138 #define FM10K_MSG_HDR_FIELD_SET(value, name) \ 139 (((u32)(value) & FM10K_MSG_HDR_MASK(name)) << FM10K_MSG_##name##_SHIFT) 140 #define FM10K_MSG_HDR_FIELD_GET(value, name) \ 141 ((u16)((value) >> FM10K_MSG_##name##_SHIFT) & FM10K_MSG_HDR_MASK(name)) 142 143 /* offsets shared between all headers */ 144 #define FM10K_MSG_TYPE_SHIFT 0 145 #define FM10K_MSG_TYPE_SIZE 4 146 #define FM10K_MSG_TAIL_SHIFT 4 147 #define FM10K_MSG_TAIL_SIZE 4 148 #define FM10K_MSG_HEAD_SHIFT 8 149 #define FM10K_MSG_HEAD_SIZE 4 150 #define FM10K_MSG_RSVD0_SHIFT 12 151 #define FM10K_MSG_RSVD0_SIZE 4 152 153 /* offsets for data/disconnect headers */ 154 #define FM10K_MSG_CRC_SHIFT 16 155 #define FM10K_MSG_CRC_SIZE 16 156 157 /* offsets for connect headers */ 158 #define FM10K_MSG_CONNECT_SIZE_SHIFT 16 159 #define FM10K_MSG_CONNECT_SIZE_SIZE 16 160 161 /* offsets for error headers */ 162 #define FM10K_MSG_ERR_NO_SHIFT 16 163 #define FM10K_MSG_ERR_NO_SIZE 16 164 165 enum fm10k_msg_type { 166 FM10K_MSG_DATA = 0x8, 167 FM10K_MSG_CONNECT = 0xC, 168 FM10K_MSG_DISCONNECT = 0xD, 169 FM10K_MSG_ERROR = 0xE, 170 }; 171 172 /* HNI/SM Mailbox FIFO format 173 * 3 2 1 0 174 * 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 0 175 * +-------+-----------------------+-------+-----------------------+ 176 * | Error | Remote Head |Version| Local Tail | 177 * +-------+-----------------------+-------+-----------------------+ 178 * | | 179 * . Local FIFO Data . 180 * . . 181 * +-------+-----------------------+-------+-----------------------+ 182 * 183 * The layout above describes the format for the FIFOs used by the host 184 * network interface and the switch manager to communicate messages back 185 * and forth. Both the HNI and the switch maintain one such FIFO. The 186 * layout in memory has the switch manager FIFO followed immediately by 187 * the HNI FIFO. For this reason I am using just the pointer to the 188 * HNI FIFO in the mailbox ops as the offset between the two is fixed. 189 * 190 * The header for the FIFO is broken out into the following fields: 191 * Local Tail: Offset into FIFO region for next DWORD to write. 192 * Version: Version info for mailbox, only values of 0/1 are supported. 193 * Remote Head: Offset into remote FIFO to indicate how much we have read. 194 * Error: Error indication, values TBD. 195 */ 196 197 /* version number for switch manager mailboxes */ 198 #define FM10K_SM_MBX_VERSION 1 199 #define FM10K_SM_MBX_FIFO_LEN (FM10K_MBMEM_PF_XOR - 1) 200 201 /* offsets shared between all SM FIFO headers */ 202 #define FM10K_MSG_SM_TAIL_SHIFT 0 203 #define FM10K_MSG_SM_TAIL_SIZE 12 204 #define FM10K_MSG_SM_VER_SHIFT 12 205 #define FM10K_MSG_SM_VER_SIZE 4 206 #define FM10K_MSG_SM_HEAD_SHIFT 16 207 #define FM10K_MSG_SM_HEAD_SIZE 12 208 #define FM10K_MSG_SM_ERR_SHIFT 28 209 #define FM10K_MSG_SM_ERR_SIZE 4 210 211 /* All error messages returned by mailbox functions 212 * The value -511 is 0xFE01 in hex. The idea is to order the errors 213 * from 0xFE01 - 0xFEFF so error codes are easily visible in the mailbox 214 * messages. This also helps to avoid error number collisions as Linux 215 * doesn't appear to use error numbers 256 - 511. 216 */ 217 #define FM10K_MBX_ERR(_n) ((_n) - 512) 218 #define FM10K_MBX_ERR_NO_MBX FM10K_MBX_ERR(0x01) 219 #define FM10K_MBX_ERR_NO_SPACE FM10K_MBX_ERR(0x03) 220 #define FM10K_MBX_ERR_TAIL FM10K_MBX_ERR(0x05) 221 #define FM10K_MBX_ERR_HEAD FM10K_MBX_ERR(0x06) 222 #define FM10K_MBX_ERR_SRC FM10K_MBX_ERR(0x08) 223 #define FM10K_MBX_ERR_TYPE FM10K_MBX_ERR(0x09) 224 #define FM10K_MBX_ERR_SIZE FM10K_MBX_ERR(0x0B) 225 #define FM10K_MBX_ERR_BUSY FM10K_MBX_ERR(0x0C) 226 #define FM10K_MBX_ERR_RSVD0 FM10K_MBX_ERR(0x0E) 227 #define FM10K_MBX_ERR_CRC FM10K_MBX_ERR(0x0F) 228 229 #define FM10K_MBX_CRC_SEED 0xFFFF 230 231 struct fm10k_mbx_ops { 232 s32 (*connect)(struct fm10k_hw *, struct fm10k_mbx_info *); 233 void (*disconnect)(struct fm10k_hw *, struct fm10k_mbx_info *); 234 bool (*rx_ready)(struct fm10k_mbx_info *); 235 bool (*tx_ready)(struct fm10k_mbx_info *, u16); 236 bool (*tx_complete)(struct fm10k_mbx_info *); 237 s32 (*enqueue_tx)(struct fm10k_hw *, struct fm10k_mbx_info *, 238 const u32 *); 239 s32 (*process)(struct fm10k_hw *, struct fm10k_mbx_info *); 240 s32 (*register_handlers)(struct fm10k_mbx_info *, 241 const struct fm10k_msg_data *); 242 }; 243 244 struct fm10k_mbx_fifo { 245 u32 *buffer; 246 u16 head; 247 u16 tail; 248 u16 size; 249 }; 250 251 /* size of buffer to be stored in mailbox for FIFOs */ 252 #define FM10K_MBX_TX_BUFFER_SIZE 512 253 #define FM10K_MBX_RX_BUFFER_SIZE 128 254 #define FM10K_MBX_BUFFER_SIZE \ 255 (FM10K_MBX_TX_BUFFER_SIZE + FM10K_MBX_RX_BUFFER_SIZE) 256 257 /* minimum and maximum message size in dwords */ 258 #define FM10K_MBX_MSG_MAX_SIZE \ 259 ((FM10K_MBX_TX_BUFFER_SIZE - 1) & (FM10K_MBX_RX_BUFFER_SIZE - 1)) 260 #define FM10K_VFMBX_MSG_MTU ((FM10K_VFMBMEM_LEN / 2) - 1) 261 262 #define FM10K_MBX_INIT_TIMEOUT 2000 /* number of retries on mailbox */ 263 #define FM10K_MBX_INIT_DELAY 500 /* microseconds between retries */ 264 265 struct fm10k_mbx_info { 266 /* function pointers for mailbox operations */ 267 struct fm10k_mbx_ops ops; 268 const struct fm10k_msg_data *msg_data; 269 270 /* message FIFOs */ 271 struct fm10k_mbx_fifo rx; 272 struct fm10k_mbx_fifo tx; 273 274 /* delay for handling timeouts */ 275 u32 timeout; 276 u32 udelay; 277 278 /* mailbox state info */ 279 u32 mbx_reg, mbmem_reg, mbx_lock, mbx_hdr; 280 u16 max_size, mbmem_len; 281 u16 tail, tail_len, pulled; 282 u16 head, head_len, pushed; 283 u16 local, remote; 284 enum fm10k_mbx_state state; 285 286 /* result of last mailbox test */ 287 s32 test_result; 288 289 /* statistics */ 290 u64 tx_busy; 291 u64 tx_dropped; 292 u64 tx_messages; 293 u64 tx_dwords; 294 u64 rx_messages; 295 u64 rx_dwords; 296 u64 rx_parse_err; 297 298 /* Buffer to store messages */ 299 u32 buffer[FM10K_MBX_BUFFER_SIZE]; 300 }; 301 302 s32 fm10k_pfvf_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *, 303 const struct fm10k_msg_data *, u8); 304 s32 fm10k_sm_mbx_init(struct fm10k_hw *, struct fm10k_mbx_info *, 305 const struct fm10k_msg_data *); 306 307 #endif /* _FM10K_MBX_H_ */ 308