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->msg[0] = code; 102 req->msg[1] = subcode; 103 memcpy(&req->msg[2], msg_data, msg_len); 104 105 /* synchronous send */ 106 if (need_resp) { 107 mutex_lock(&hdev->mbx_resp.mbx_mutex); 108 hclgevf_reset_mbx_resp_status(hdev); 109 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 110 if (status) { 111 dev_err(&hdev->pdev->dev, 112 "VF failed(=%d) to send mbx message to PF\n", 113 status); 114 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 115 return status; 116 } 117 118 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data, 119 resp_len); 120 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 121 } else { 122 /* asynchronous send */ 123 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 124 if (status) { 125 dev_err(&hdev->pdev->dev, 126 "VF failed(=%d) to send mbx message to PF\n", 127 status); 128 return status; 129 } 130 } 131 132 return status; 133 } 134 135 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw) 136 { 137 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG); 138 139 return tail == hw->cmq.crq.next_to_use; 140 } 141 142 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 143 { 144 struct hclgevf_mbx_resp_status *resp; 145 struct hclge_mbx_pf_to_vf_cmd *req; 146 struct hclgevf_cmq_ring *crq; 147 struct hclgevf_desc *desc; 148 u16 *msg_q; 149 u16 flag; 150 u8 *temp; 151 int i; 152 153 resp = &hdev->mbx_resp; 154 crq = &hdev->hw.cmq.crq; 155 156 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 157 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 158 dev_info(&hdev->pdev->dev, "vf crq need init\n"); 159 return; 160 } 161 162 desc = &crq->desc[crq->next_to_use]; 163 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 164 165 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 166 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 167 dev_warn(&hdev->pdev->dev, 168 "dropped invalid mailbox message, code = %d\n", 169 req->msg[0]); 170 171 /* dropping/not processing this invalid message */ 172 crq->desc[crq->next_to_use].flag = 0; 173 hclge_mbx_ring_ptr_move_crq(crq); 174 continue; 175 } 176 177 /* synchronous messages are time critical and need preferential 178 * treatment. Therefore, we need to acknowledge all the sync 179 * responses as quickly as possible so that waiting tasks do not 180 * timeout and simultaneously queue the async messages for later 181 * prcessing in context of mailbox task i.e. the slow path. 182 */ 183 switch (req->msg[0]) { 184 case HCLGE_MBX_PF_VF_RESP: 185 if (resp->received_resp) 186 dev_warn(&hdev->pdev->dev, 187 "VF mbx resp flag not clear(%d)\n", 188 req->msg[1]); 189 resp->received_resp = true; 190 191 resp->origin_mbx_msg = (req->msg[1] << 16); 192 resp->origin_mbx_msg |= req->msg[2]; 193 resp->resp_status = req->msg[3]; 194 195 temp = (u8 *)&req->msg[4]; 196 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 197 resp->additional_info[i] = *temp; 198 temp++; 199 } 200 break; 201 case HCLGE_MBX_LINK_STAT_CHANGE: 202 case HCLGE_MBX_ASSERTING_RESET: 203 case HCLGE_MBX_LINK_STAT_MODE: 204 case HLCGE_MBX_PUSH_VLAN_INFO: 205 /* set this mbx event as pending. This is required as we 206 * might loose interrupt event when mbx task is busy 207 * handling. This shall be cleared when mbx task just 208 * enters handling state. 209 */ 210 hdev->mbx_event_pending = true; 211 212 /* we will drop the async msg if we find ARQ as full 213 * and continue with next message 214 */ 215 if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) { 216 dev_warn(&hdev->pdev->dev, 217 "Async Q full, dropping msg(%d)\n", 218 req->msg[1]); 219 break; 220 } 221 222 /* tail the async message in arq */ 223 msg_q = hdev->arq.msg_q[hdev->arq.tail]; 224 memcpy(&msg_q[0], req->msg, 225 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 226 hclge_mbx_tail_ptr_move_arq(hdev->arq); 227 hdev->arq.count++; 228 229 hclgevf_mbx_task_schedule(hdev); 230 231 break; 232 default: 233 dev_err(&hdev->pdev->dev, 234 "VF received unsupported(%d) mbx msg from PF\n", 235 req->msg[0]); 236 break; 237 } 238 crq->desc[crq->next_to_use].flag = 0; 239 hclge_mbx_ring_ptr_move_crq(crq); 240 } 241 242 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 243 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 244 crq->next_to_use); 245 } 246 247 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 248 { 249 enum hnae3_reset_type reset_type; 250 u16 link_status, state; 251 u16 *msg_q, *vlan_info; 252 u8 duplex; 253 u32 speed; 254 u32 tail; 255 u8 idx; 256 257 /* we can safely clear it now as we are at start of the async message 258 * processing 259 */ 260 hdev->mbx_event_pending = false; 261 262 tail = hdev->arq.tail; 263 264 /* process all the async queue messages */ 265 while (tail != hdev->arq.head) { 266 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 267 dev_info(&hdev->pdev->dev, 268 "vf crq need init in async\n"); 269 return; 270 } 271 272 msg_q = hdev->arq.msg_q[hdev->arq.head]; 273 274 switch (msg_q[0]) { 275 case HCLGE_MBX_LINK_STAT_CHANGE: 276 link_status = le16_to_cpu(msg_q[1]); 277 memcpy(&speed, &msg_q[2], sizeof(speed)); 278 duplex = (u8)le16_to_cpu(msg_q[4]); 279 280 /* update upper layer with new link link status */ 281 hclgevf_update_link_status(hdev, link_status); 282 hclgevf_update_speed_duplex(hdev, speed, duplex); 283 284 break; 285 case HCLGE_MBX_LINK_STAT_MODE: 286 idx = (u8)le16_to_cpu(msg_q[1]); 287 if (idx) 288 memcpy(&hdev->hw.mac.supported, &msg_q[2], 289 sizeof(unsigned long)); 290 else 291 memcpy(&hdev->hw.mac.advertising, &msg_q[2], 292 sizeof(unsigned long)); 293 break; 294 case HCLGE_MBX_ASSERTING_RESET: 295 /* PF has asserted reset hence VF should go in pending 296 * state and poll for the hardware reset status till it 297 * has been completely reset. After this stack should 298 * eventually be re-initialized. 299 */ 300 reset_type = le16_to_cpu(msg_q[1]); 301 set_bit(reset_type, &hdev->reset_pending); 302 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 303 hclgevf_reset_task_schedule(hdev); 304 305 break; 306 case HLCGE_MBX_PUSH_VLAN_INFO: 307 state = le16_to_cpu(msg_q[1]); 308 vlan_info = &msg_q[1]; 309 hclgevf_update_port_base_vlan_info(hdev, state, 310 (u8 *)vlan_info, 8); 311 break; 312 default: 313 dev_err(&hdev->pdev->dev, 314 "fetched unsupported(%d) message from arq\n", 315 msg_q[0]); 316 break; 317 } 318 319 hclge_mbx_head_ptr_move_arq(hdev->arq); 320 hdev->arq.count--; 321 msg_q = hdev->arq.msg_q[hdev->arq.head]; 322 } 323 } 324