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