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