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 static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev, 159 struct hclge_mbx_pf_to_vf_cmd *req) 160 { 161 struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp; 162 163 if (resp->received_resp) 164 dev_warn(&hdev->pdev->dev, 165 "VF mbx resp flag not clear(%u)\n", 166 req->msg.vf_mbx_msg_code); 167 168 resp->origin_mbx_msg = 169 (req->msg.vf_mbx_msg_code << 16); 170 resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode; 171 resp->resp_status = 172 hclgevf_resp_to_errno(req->msg.resp_status); 173 memcpy(resp->additional_info, req->msg.resp_data, 174 HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8)); 175 if (req->match_id) { 176 /* If match_id is not zero, it means PF support match_id. 177 * if the match_id is right, VF get the right response, or 178 * ignore the response. and driver will clear hdev->mbx_resp 179 * when send next message which need response. 180 */ 181 if (req->match_id == resp->match_id) 182 resp->received_resp = true; 183 } else { 184 resp->received_resp = true; 185 } 186 } 187 188 static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev, 189 struct hclge_mbx_pf_to_vf_cmd *req) 190 { 191 /* we will drop the async msg if we find ARQ as full 192 * and continue with next message 193 */ 194 if (atomic_read(&hdev->arq.count) >= 195 HCLGE_MBX_MAX_ARQ_MSG_NUM) { 196 dev_warn(&hdev->pdev->dev, 197 "Async Q full, dropping msg(%u)\n", 198 req->msg.code); 199 return; 200 } 201 202 /* tail the async message in arq */ 203 memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg, 204 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 205 hclge_mbx_tail_ptr_move_arq(hdev->arq); 206 atomic_inc(&hdev->arq.count); 207 208 hclgevf_mbx_task_schedule(hdev); 209 } 210 211 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 212 { 213 struct hclge_mbx_pf_to_vf_cmd *req; 214 struct hclgevf_cmq_ring *crq; 215 struct hclgevf_desc *desc; 216 u16 flag; 217 218 crq = &hdev->hw.cmq.crq; 219 220 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 221 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 222 dev_info(&hdev->pdev->dev, "vf crq need init\n"); 223 return; 224 } 225 226 desc = &crq->desc[crq->next_to_use]; 227 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 228 229 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 230 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 231 dev_warn(&hdev->pdev->dev, 232 "dropped invalid mailbox message, code = %u\n", 233 req->msg.code); 234 235 /* dropping/not processing this invalid message */ 236 crq->desc[crq->next_to_use].flag = 0; 237 hclge_mbx_ring_ptr_move_crq(crq); 238 continue; 239 } 240 241 trace_hclge_vf_mbx_get(hdev, req); 242 243 /* synchronous messages are time critical and need preferential 244 * treatment. Therefore, we need to acknowledge all the sync 245 * responses as quickly as possible so that waiting tasks do not 246 * timeout and simultaneously queue the async messages for later 247 * prcessing in context of mailbox task i.e. the slow path. 248 */ 249 switch (req->msg.code) { 250 case HCLGE_MBX_PF_VF_RESP: 251 hclgevf_handle_mbx_response(hdev, req); 252 break; 253 case HCLGE_MBX_LINK_STAT_CHANGE: 254 case HCLGE_MBX_ASSERTING_RESET: 255 case HCLGE_MBX_LINK_STAT_MODE: 256 case HCLGE_MBX_PUSH_VLAN_INFO: 257 case HCLGE_MBX_PUSH_PROMISC_INFO: 258 hclgevf_handle_mbx_msg(hdev, req); 259 break; 260 default: 261 dev_err(&hdev->pdev->dev, 262 "VF received unsupported(%u) mbx msg from PF\n", 263 req->msg.code); 264 break; 265 } 266 crq->desc[crq->next_to_use].flag = 0; 267 hclge_mbx_ring_ptr_move_crq(crq); 268 } 269 270 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 271 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 272 crq->next_to_use); 273 } 274 275 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev, 276 u16 promisc_info) 277 { 278 if (!promisc_info) 279 dev_info(&hdev->pdev->dev, 280 "Promisc mode is closed by host for being untrusted.\n"); 281 } 282 283 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 284 { 285 enum hnae3_reset_type reset_type; 286 u16 link_status, state; 287 u16 *msg_q, *vlan_info; 288 u8 duplex; 289 u32 speed; 290 u32 tail; 291 u8 flag; 292 u8 idx; 293 294 tail = hdev->arq.tail; 295 296 /* process all the async queue messages */ 297 while (tail != hdev->arq.head) { 298 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 299 dev_info(&hdev->pdev->dev, 300 "vf crq need init in async\n"); 301 return; 302 } 303 304 msg_q = hdev->arq.msg_q[hdev->arq.head]; 305 306 switch (msg_q[0]) { 307 case HCLGE_MBX_LINK_STAT_CHANGE: 308 link_status = msg_q[1]; 309 memcpy(&speed, &msg_q[2], sizeof(speed)); 310 duplex = (u8)msg_q[4]; 311 flag = (u8)msg_q[5]; 312 313 /* update upper layer with new link link status */ 314 hclgevf_update_speed_duplex(hdev, speed, duplex); 315 hclgevf_update_link_status(hdev, link_status); 316 317 if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN) 318 set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS, 319 &hdev->state); 320 321 break; 322 case HCLGE_MBX_LINK_STAT_MODE: 323 idx = (u8)msg_q[1]; 324 if (idx) 325 memcpy(&hdev->hw.mac.supported, &msg_q[2], 326 sizeof(unsigned long)); 327 else 328 memcpy(&hdev->hw.mac.advertising, &msg_q[2], 329 sizeof(unsigned long)); 330 break; 331 case HCLGE_MBX_ASSERTING_RESET: 332 /* PF has asserted reset hence VF should go in pending 333 * state and poll for the hardware reset status till it 334 * has been completely reset. After this stack should 335 * eventually be re-initialized. 336 */ 337 reset_type = (enum hnae3_reset_type)msg_q[1]; 338 set_bit(reset_type, &hdev->reset_pending); 339 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 340 hclgevf_reset_task_schedule(hdev); 341 342 break; 343 case HCLGE_MBX_PUSH_VLAN_INFO: 344 state = msg_q[1]; 345 vlan_info = &msg_q[1]; 346 hclgevf_update_port_base_vlan_info(hdev, state, 347 (u8 *)vlan_info, 8); 348 break; 349 case HCLGE_MBX_PUSH_PROMISC_INFO: 350 hclgevf_parse_promisc_info(hdev, msg_q[1]); 351 break; 352 default: 353 dev_err(&hdev->pdev->dev, 354 "fetched unsupported(%u) message from arq\n", 355 msg_q[0]); 356 break; 357 } 358 359 hclge_mbx_head_ptr_move_arq(hdev->arq); 360 atomic_dec(&hdev->arq.count); 361 msg_q = hdev->arq.msg_q[hdev->arq.head]; 362 } 363 } 364