1 // SPDX-License-Identifier: GPL-2.0+ 2 // Copyright (c) 2016-2017 Hisilicon Limited. 3 4 #include "hclge_mbx.h" 5 #include "hclgevf_main.h" 6 #include "hnae3.h" 7 8 #define CREATE_TRACE_POINTS 9 #include "hclgevf_trace.h" 10 11 static int hclgevf_resp_to_errno(u16 resp_code) 12 { 13 return resp_code ? -resp_code : 0; 14 } 15 16 #define HCLGEVF_MBX_MATCH_ID_START 1 17 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev) 18 { 19 /* this function should be called with mbx_resp.mbx_mutex held 20 * to prtect the received_response from race condition 21 */ 22 hdev->mbx_resp.received_resp = false; 23 hdev->mbx_resp.origin_mbx_msg = 0; 24 hdev->mbx_resp.resp_status = 0; 25 hdev->mbx_resp.match_id++; 26 /* Update match_id and ensure the value of match_id is not zero */ 27 if (hdev->mbx_resp.match_id == 0) 28 hdev->mbx_resp.match_id = HCLGEVF_MBX_MATCH_ID_START; 29 memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE); 30 } 31 32 /* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox 33 * message to PF. 34 * @hdev: pointer to struct hclgevf_dev 35 * @resp_msg: pointer to store the original message type and response status 36 * @len: the resp_msg data array length. 37 */ 38 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1, 39 u8 *resp_data, u16 resp_len) 40 { 41 #define HCLGEVF_MAX_TRY_TIMES 500 42 #define HCLGEVF_SLEEP_USECOND 1000 43 struct hclgevf_mbx_resp_status *mbx_resp; 44 u16 r_code0, r_code1; 45 int i = 0; 46 47 if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) { 48 dev_err(&hdev->pdev->dev, 49 "VF mbx response len(=%u) exceeds maximum(=%u)\n", 50 resp_len, 51 HCLGE_MBX_MAX_RESP_DATA_SIZE); 52 return -EINVAL; 53 } 54 55 while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) { 56 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) 57 return -EIO; 58 59 usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2); 60 i++; 61 } 62 63 if (i >= HCLGEVF_MAX_TRY_TIMES) { 64 dev_err(&hdev->pdev->dev, 65 "VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n", 66 code0, code1, hdev->mbx_resp.received_resp, i); 67 return -EIO; 68 } 69 70 mbx_resp = &hdev->mbx_resp; 71 r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16); 72 r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff); 73 74 if (mbx_resp->resp_status) 75 return mbx_resp->resp_status; 76 77 if (resp_data) 78 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len); 79 80 hclgevf_reset_mbx_resp_status(hdev); 81 82 if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) { 83 dev_err(&hdev->pdev->dev, 84 "VF could not match resp code(code0=%u,code1=%u), %d\n", 85 code0, code1, mbx_resp->resp_status); 86 dev_err(&hdev->pdev->dev, 87 "VF could not match resp r_code(r_code0=%u,r_code1=%u)\n", 88 r_code0, r_code1); 89 return -EIO; 90 } 91 92 return 0; 93 } 94 95 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, 96 struct hclge_vf_to_pf_msg *send_msg, bool need_resp, 97 u8 *resp_data, u16 resp_len) 98 { 99 struct hclge_mbx_vf_to_pf_cmd *req; 100 struct hclgevf_desc desc; 101 int status; 102 103 req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data; 104 105 if (!send_msg) { 106 dev_err(&hdev->pdev->dev, 107 "failed to send mbx, msg is NULL\n"); 108 return -EINVAL; 109 } 110 111 hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false); 112 if (need_resp) 113 hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1); 114 115 memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg)); 116 117 trace_hclge_vf_mbx_send(hdev, req); 118 119 /* synchronous send */ 120 if (need_resp) { 121 mutex_lock(&hdev->mbx_resp.mbx_mutex); 122 hclgevf_reset_mbx_resp_status(hdev); 123 req->match_id = hdev->mbx_resp.match_id; 124 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 125 if (status) { 126 dev_err(&hdev->pdev->dev, 127 "VF failed(=%d) to send mbx message to PF\n", 128 status); 129 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 130 return status; 131 } 132 133 status = hclgevf_get_mbx_resp(hdev, send_msg->code, 134 send_msg->subcode, resp_data, 135 resp_len); 136 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 137 } else { 138 /* asynchronous send */ 139 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 140 if (status) { 141 dev_err(&hdev->pdev->dev, 142 "VF failed(=%d) to send mbx message to PF\n", 143 status); 144 return status; 145 } 146 } 147 148 return status; 149 } 150 151 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw) 152 { 153 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG); 154 155 return tail == hw->cmq.crq.next_to_use; 156 } 157 158 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 159 { 160 struct hclgevf_mbx_resp_status *resp; 161 struct hclge_mbx_pf_to_vf_cmd *req; 162 struct hclgevf_cmq_ring *crq; 163 struct hclgevf_desc *desc; 164 u16 *msg_q; 165 u16 flag; 166 u8 *temp; 167 int i; 168 169 resp = &hdev->mbx_resp; 170 crq = &hdev->hw.cmq.crq; 171 172 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 173 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 174 dev_info(&hdev->pdev->dev, "vf crq need init\n"); 175 return; 176 } 177 178 desc = &crq->desc[crq->next_to_use]; 179 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 180 181 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 182 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 183 dev_warn(&hdev->pdev->dev, 184 "dropped invalid mailbox message, code = %u\n", 185 req->msg.code); 186 187 /* dropping/not processing this invalid message */ 188 crq->desc[crq->next_to_use].flag = 0; 189 hclge_mbx_ring_ptr_move_crq(crq); 190 continue; 191 } 192 193 trace_hclge_vf_mbx_get(hdev, req); 194 195 /* synchronous messages are time critical and need preferential 196 * treatment. Therefore, we need to acknowledge all the sync 197 * responses as quickly as possible so that waiting tasks do not 198 * timeout and simultaneously queue the async messages for later 199 * prcessing in context of mailbox task i.e. the slow path. 200 */ 201 switch (req->msg.code) { 202 case HCLGE_MBX_PF_VF_RESP: 203 if (resp->received_resp) 204 dev_warn(&hdev->pdev->dev, 205 "VF mbx resp flag not clear(%u)\n", 206 req->msg.vf_mbx_msg_code); 207 resp->received_resp = true; 208 209 resp->origin_mbx_msg = 210 (req->msg.vf_mbx_msg_code << 16); 211 resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode; 212 resp->resp_status = 213 hclgevf_resp_to_errno(req->msg.resp_status); 214 215 temp = (u8 *)req->msg.resp_data; 216 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 217 resp->additional_info[i] = *temp; 218 temp++; 219 } 220 221 /* If match_id is not zero, it means PF support 222 * match_id. If the match_id is right, VF get the 223 * right response, otherwise ignore the response. 224 * Driver will clear hdev->mbx_resp when send 225 * next message which need response. 226 */ 227 if (req->match_id) { 228 if (req->match_id == resp->match_id) 229 resp->received_resp = true; 230 } else { 231 resp->received_resp = true; 232 } 233 break; 234 case HCLGE_MBX_LINK_STAT_CHANGE: 235 case HCLGE_MBX_ASSERTING_RESET: 236 case HCLGE_MBX_LINK_STAT_MODE: 237 case HCLGE_MBX_PUSH_VLAN_INFO: 238 case HCLGE_MBX_PUSH_PROMISC_INFO: 239 /* set this mbx event as pending. This is required as we 240 * might loose interrupt event when mbx task is busy 241 * handling. This shall be cleared when mbx task just 242 * enters handling state. 243 */ 244 hdev->mbx_event_pending = true; 245 246 /* we will drop the async msg if we find ARQ as full 247 * and continue with next message 248 */ 249 if (atomic_read(&hdev->arq.count) >= 250 HCLGE_MBX_MAX_ARQ_MSG_NUM) { 251 dev_warn(&hdev->pdev->dev, 252 "Async Q full, dropping msg(%u)\n", 253 req->msg.code); 254 break; 255 } 256 257 /* tail the async message in arq */ 258 msg_q = hdev->arq.msg_q[hdev->arq.tail]; 259 memcpy(&msg_q[0], &req->msg, 260 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 261 hclge_mbx_tail_ptr_move_arq(hdev->arq); 262 atomic_inc(&hdev->arq.count); 263 264 hclgevf_mbx_task_schedule(hdev); 265 266 break; 267 default: 268 dev_err(&hdev->pdev->dev, 269 "VF received unsupported(%u) mbx msg from PF\n", 270 req->msg.code); 271 break; 272 } 273 crq->desc[crq->next_to_use].flag = 0; 274 hclge_mbx_ring_ptr_move_crq(crq); 275 } 276 277 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 278 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 279 crq->next_to_use); 280 } 281 282 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev, 283 u16 promisc_info) 284 { 285 if (!promisc_info) 286 dev_info(&hdev->pdev->dev, 287 "Promisc mode is closed by host for being untrusted.\n"); 288 } 289 290 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 291 { 292 enum hnae3_reset_type reset_type; 293 u16 link_status, state; 294 u16 *msg_q, *vlan_info; 295 u8 duplex; 296 u32 speed; 297 u32 tail; 298 u8 flag; 299 u8 idx; 300 301 /* we can safely clear it now as we are at start of the async message 302 * processing 303 */ 304 hdev->mbx_event_pending = false; 305 306 tail = hdev->arq.tail; 307 308 /* process all the async queue messages */ 309 while (tail != hdev->arq.head) { 310 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 311 dev_info(&hdev->pdev->dev, 312 "vf crq need init in async\n"); 313 return; 314 } 315 316 msg_q = hdev->arq.msg_q[hdev->arq.head]; 317 318 switch (msg_q[0]) { 319 case HCLGE_MBX_LINK_STAT_CHANGE: 320 link_status = msg_q[1]; 321 memcpy(&speed, &msg_q[2], sizeof(speed)); 322 duplex = (u8)msg_q[4]; 323 flag = (u8)msg_q[5]; 324 325 /* update upper layer with new link link status */ 326 hclgevf_update_link_status(hdev, link_status); 327 hclgevf_update_speed_duplex(hdev, speed, duplex); 328 329 if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN) 330 set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS, 331 &hdev->state); 332 333 break; 334 case HCLGE_MBX_LINK_STAT_MODE: 335 idx = (u8)msg_q[1]; 336 if (idx) 337 memcpy(&hdev->hw.mac.supported, &msg_q[2], 338 sizeof(unsigned long)); 339 else 340 memcpy(&hdev->hw.mac.advertising, &msg_q[2], 341 sizeof(unsigned long)); 342 break; 343 case HCLGE_MBX_ASSERTING_RESET: 344 /* PF has asserted reset hence VF should go in pending 345 * state and poll for the hardware reset status till it 346 * has been completely reset. After this stack should 347 * eventually be re-initialized. 348 */ 349 reset_type = (enum hnae3_reset_type)msg_q[1]; 350 set_bit(reset_type, &hdev->reset_pending); 351 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 352 hclgevf_reset_task_schedule(hdev); 353 354 break; 355 case HCLGE_MBX_PUSH_VLAN_INFO: 356 state = msg_q[1]; 357 vlan_info = &msg_q[1]; 358 hclgevf_update_port_base_vlan_info(hdev, state, 359 (u8 *)vlan_info, 8); 360 break; 361 case HCLGE_MBX_PUSH_PROMISC_INFO: 362 hclgevf_parse_promisc_info(hdev, msg_q[1]); 363 break; 364 default: 365 dev_err(&hdev->pdev->dev, 366 "fetched unsupported(%u) message from arq\n", 367 msg_q[0]); 368 break; 369 } 370 371 hclge_mbx_head_ptr_move_arq(hdev->arq); 372 atomic_dec(&hdev->arq.count); 373 msg_q = hdev->arq.msg_q[hdev->arq.head]; 374 } 375 } 376