1 /* SPDX-License-Identifier: BSD-3-Clause 2 * Copyright(c) 2018-2021 Beijing WangXun Technology Co., Ltd. 3 * Copyright(c) 2010-2017 Intel Corporation 4 */ 5 6 #include "ngbe_type.h" 7 8 #include "ngbe_mbx.h" 9 10 /** 11 * ngbe_read_mbx - Reads a message from the mailbox 12 * @hw: pointer to the HW structure 13 * @msg: The message buffer 14 * @size: Length of buffer 15 * @mbx_id: id of mailbox to read 16 * 17 * returns 0 if it successfully read message from buffer 18 **/ 19 s32 ngbe_read_mbx(struct ngbe_hw *hw, u32 *msg, u16 size, u16 mbx_id) 20 { 21 struct ngbe_mbx_info *mbx = &hw->mbx; 22 s32 ret_val = NGBE_ERR_MBX; 23 24 DEBUGFUNC("ngbe_read_mbx"); 25 26 /* limit read to size of mailbox */ 27 if (size > mbx->size) 28 size = mbx->size; 29 30 if (mbx->read) 31 ret_val = mbx->read(hw, msg, size, mbx_id); 32 33 return ret_val; 34 } 35 36 /** 37 * ngbe_write_mbx - Write a message to the mailbox 38 * @hw: pointer to the HW structure 39 * @msg: The message buffer 40 * @size: Length of buffer 41 * @mbx_id: id of mailbox to write 42 * 43 * returns 0 if it successfully copied message into the buffer 44 **/ 45 s32 ngbe_write_mbx(struct ngbe_hw *hw, u32 *msg, u16 size, u16 mbx_id) 46 { 47 struct ngbe_mbx_info *mbx = &hw->mbx; 48 s32 ret_val = 0; 49 50 DEBUGFUNC("ngbe_write_mbx"); 51 52 if (size > mbx->size) { 53 ret_val = NGBE_ERR_MBX; 54 DEBUGOUT("Invalid mailbox message size %d", size); 55 } else if (mbx->write) { 56 ret_val = mbx->write(hw, msg, size, mbx_id); 57 } 58 59 return ret_val; 60 } 61 62 /** 63 * ngbe_check_for_msg - checks to see if someone sent us mail 64 * @hw: pointer to the HW structure 65 * @mbx_id: id of mailbox to check 66 * 67 * returns 0 if the Status bit was found or else ERR_MBX 68 **/ 69 s32 ngbe_check_for_msg(struct ngbe_hw *hw, u16 mbx_id) 70 { 71 struct ngbe_mbx_info *mbx = &hw->mbx; 72 s32 ret_val = NGBE_ERR_MBX; 73 74 DEBUGFUNC("ngbe_check_for_msg"); 75 76 if (mbx->check_for_msg) 77 ret_val = mbx->check_for_msg(hw, mbx_id); 78 79 return ret_val; 80 } 81 82 /** 83 * ngbe_check_for_ack - checks to see if someone sent us ACK 84 * @hw: pointer to the HW structure 85 * @mbx_id: id of mailbox to check 86 * 87 * returns 0 if the Status bit was found or else ERR_MBX 88 **/ 89 s32 ngbe_check_for_ack(struct ngbe_hw *hw, u16 mbx_id) 90 { 91 struct ngbe_mbx_info *mbx = &hw->mbx; 92 s32 ret_val = NGBE_ERR_MBX; 93 94 DEBUGFUNC("ngbe_check_for_ack"); 95 96 if (mbx->check_for_ack) 97 ret_val = mbx->check_for_ack(hw, mbx_id); 98 99 return ret_val; 100 } 101 102 /** 103 * ngbe_check_for_rst - checks to see if other side has reset 104 * @hw: pointer to the HW structure 105 * @mbx_id: id of mailbox to check 106 * 107 * returns 0 if the Status bit was found or else ERR_MBX 108 **/ 109 s32 ngbe_check_for_rst(struct ngbe_hw *hw, u16 mbx_id) 110 { 111 struct ngbe_mbx_info *mbx = &hw->mbx; 112 s32 ret_val = NGBE_ERR_MBX; 113 114 DEBUGFUNC("ngbe_check_for_rst"); 115 116 if (mbx->check_for_rst) 117 ret_val = mbx->check_for_rst(hw, mbx_id); 118 119 return ret_val; 120 } 121 122 STATIC s32 ngbe_check_for_bit_pf(struct ngbe_hw *hw, u32 mask) 123 { 124 u32 mbvficr = rd32(hw, NGBE_MBVFICR); 125 s32 ret_val = NGBE_ERR_MBX; 126 127 if (mbvficr & mask) { 128 ret_val = 0; 129 wr32(hw, NGBE_MBVFICR, mask); 130 } 131 132 return ret_val; 133 } 134 135 /** 136 * ngbe_check_for_msg_pf - checks to see if the VF has sent mail 137 * @hw: pointer to the HW structure 138 * @vf_number: the VF index 139 * 140 * returns 0 if the VF has set the Status bit or else ERR_MBX 141 **/ 142 s32 ngbe_check_for_msg_pf(struct ngbe_hw *hw, u16 vf_number) 143 { 144 s32 ret_val = NGBE_ERR_MBX; 145 u32 vf_bit = vf_number; 146 147 DEBUGFUNC("ngbe_check_for_msg_pf"); 148 149 if (!ngbe_check_for_bit_pf(hw, NGBE_MBVFICR_VFREQ_VF1 << vf_bit)) { 150 ret_val = 0; 151 hw->mbx.stats.reqs++; 152 } 153 154 return ret_val; 155 } 156 157 /** 158 * ngbe_check_for_ack_pf - checks to see if the VF has ACKed 159 * @hw: pointer to the HW structure 160 * @vf_number: the VF index 161 * 162 * returns 0 if the VF has set the Status bit or else ERR_MBX 163 **/ 164 s32 ngbe_check_for_ack_pf(struct ngbe_hw *hw, u16 vf_number) 165 { 166 s32 ret_val = NGBE_ERR_MBX; 167 u32 vf_bit = vf_number; 168 169 DEBUGFUNC("ngbe_check_for_ack_pf"); 170 171 if (!ngbe_check_for_bit_pf(hw, NGBE_MBVFICR_VFACK_VF1 << vf_bit)) { 172 ret_val = 0; 173 hw->mbx.stats.acks++; 174 } 175 176 return ret_val; 177 } 178 179 /** 180 * ngbe_check_for_rst_pf - checks to see if the VF has reset 181 * @hw: pointer to the HW structure 182 * @vf_number: the VF index 183 * 184 * returns 0 if the VF has set the Status bit or else ERR_MBX 185 **/ 186 s32 ngbe_check_for_rst_pf(struct ngbe_hw *hw, u16 vf_number) 187 { 188 u32 vflre = 0; 189 s32 ret_val = NGBE_ERR_MBX; 190 191 DEBUGFUNC("ngbe_check_for_rst_pf"); 192 193 vflre = rd32(hw, NGBE_FLRVFE); 194 if (vflre & (1 << vf_number)) { 195 ret_val = 0; 196 wr32(hw, NGBE_FLRVFEC, (1 << vf_number)); 197 hw->mbx.stats.rsts++; 198 } 199 200 return ret_val; 201 } 202 203 /** 204 * ngbe_obtain_mbx_lock_pf - obtain mailbox lock 205 * @hw: pointer to the HW structure 206 * @vf_number: the VF index 207 * 208 * return 0 if we obtained the mailbox lock 209 **/ 210 STATIC s32 ngbe_obtain_mbx_lock_pf(struct ngbe_hw *hw, u16 vf_number) 211 { 212 s32 ret_val = NGBE_ERR_MBX; 213 u32 p2v_mailbox; 214 215 DEBUGFUNC("ngbe_obtain_mbx_lock_pf"); 216 217 /* Take ownership of the buffer */ 218 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_PFU); 219 220 /* reserve mailbox for vf use */ 221 p2v_mailbox = rd32(hw, NGBE_MBCTL(vf_number)); 222 if (p2v_mailbox & NGBE_MBCTL_PFU) 223 ret_val = 0; 224 else 225 DEBUGOUT("Failed to obtain mailbox lock for VF%d", vf_number); 226 227 228 return ret_val; 229 } 230 231 /** 232 * ngbe_write_mbx_pf - Places a message in the mailbox 233 * @hw: pointer to the HW structure 234 * @msg: The message buffer 235 * @size: Length of buffer 236 * @vf_number: the VF index 237 * 238 * returns 0 if it successfully copied message into the buffer 239 **/ 240 s32 ngbe_write_mbx_pf(struct ngbe_hw *hw, u32 *msg, u16 size, u16 vf_number) 241 { 242 s32 ret_val; 243 u16 i; 244 245 DEBUGFUNC("ngbe_write_mbx_pf"); 246 247 /* lock the mailbox to prevent pf/vf race condition */ 248 ret_val = ngbe_obtain_mbx_lock_pf(hw, vf_number); 249 if (ret_val) 250 goto out_no_write; 251 252 /* flush msg and acks as we are overwriting the message buffer */ 253 ngbe_check_for_msg_pf(hw, vf_number); 254 ngbe_check_for_ack_pf(hw, vf_number); 255 256 /* copy the caller specified message to the mailbox memory buffer */ 257 for (i = 0; i < size; i++) 258 wr32a(hw, NGBE_MBMEM(vf_number), i, msg[i]); 259 260 /* Interrupt VF to tell it a message has been sent and release buffer*/ 261 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_STS); 262 263 /* update stats */ 264 hw->mbx.stats.msgs_tx++; 265 266 out_no_write: 267 return ret_val; 268 } 269 270 /** 271 * ngbe_read_mbx_pf - Read a message from the mailbox 272 * @hw: pointer to the HW structure 273 * @msg: The message buffer 274 * @size: Length of buffer 275 * @vf_number: the VF index 276 * 277 * This function copies a message from the mailbox buffer to the caller's 278 * memory buffer. The presumption is that the caller knows that there was 279 * a message due to a VF request so no polling for message is needed. 280 **/ 281 s32 ngbe_read_mbx_pf(struct ngbe_hw *hw, u32 *msg, u16 size, u16 vf_number) 282 { 283 s32 ret_val; 284 u16 i; 285 286 DEBUGFUNC("ngbe_read_mbx_pf"); 287 288 /* lock the mailbox to prevent pf/vf race condition */ 289 ret_val = ngbe_obtain_mbx_lock_pf(hw, vf_number); 290 if (ret_val) 291 goto out_no_read; 292 293 /* copy the message to the mailbox memory buffer */ 294 for (i = 0; i < size; i++) 295 msg[i] = rd32a(hw, NGBE_MBMEM(vf_number), i); 296 297 /* Acknowledge the message and release buffer */ 298 wr32(hw, NGBE_MBCTL(vf_number), NGBE_MBCTL_ACK); 299 300 /* update stats */ 301 hw->mbx.stats.msgs_rx++; 302 303 out_no_read: 304 return ret_val; 305 } 306 307 /** 308 * ngbe_init_mbx_params_pf - set initial values for pf mailbox 309 * @hw: pointer to the HW structure 310 * 311 * Initializes the hw->mbx struct to correct values for pf mailbox 312 */ 313 void ngbe_init_mbx_params_pf(struct ngbe_hw *hw) 314 { 315 struct ngbe_mbx_info *mbx = &hw->mbx; 316 317 mbx->timeout = 0; 318 mbx->usec_delay = 0; 319 320 mbx->size = NGBE_P2VMBX_SIZE; 321 322 mbx->stats.msgs_tx = 0; 323 mbx->stats.msgs_rx = 0; 324 mbx->stats.reqs = 0; 325 mbx->stats.acks = 0; 326 mbx->stats.rsts = 0; 327 } 328