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 memcpy(&req->msg[2], msg_data, msg_len); 106 107 /* synchronous send */ 108 if (need_resp) { 109 mutex_lock(&hdev->mbx_resp.mbx_mutex); 110 hclgevf_reset_mbx_resp_status(hdev); 111 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 112 if (status) { 113 dev_err(&hdev->pdev->dev, 114 "VF failed(=%d) to send mbx message to PF\n", 115 status); 116 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 117 return status; 118 } 119 120 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data, 121 resp_len); 122 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 123 } else { 124 /* asynchronous send */ 125 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 126 if (status) { 127 dev_err(&hdev->pdev->dev, 128 "VF failed(=%d) to send mbx message to PF\n", 129 status); 130 return status; 131 } 132 } 133 134 return status; 135 } 136 137 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw) 138 { 139 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG); 140 141 return tail == hw->cmq.crq.next_to_use; 142 } 143 144 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 145 { 146 struct hclgevf_mbx_resp_status *resp; 147 struct hclge_mbx_pf_to_vf_cmd *req; 148 struct hclgevf_cmq_ring *crq; 149 struct hclgevf_desc *desc; 150 u16 *msg_q; 151 u16 flag; 152 u8 *temp; 153 int i; 154 155 resp = &hdev->mbx_resp; 156 crq = &hdev->hw.cmq.crq; 157 158 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 159 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 160 dev_info(&hdev->pdev->dev, "vf crq need init\n"); 161 return; 162 } 163 164 desc = &crq->desc[crq->next_to_use]; 165 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 166 167 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 168 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 169 dev_warn(&hdev->pdev->dev, 170 "dropped invalid mailbox message, code = %d\n", 171 req->msg[0]); 172 173 /* dropping/not processing this invalid message */ 174 crq->desc[crq->next_to_use].flag = 0; 175 hclge_mbx_ring_ptr_move_crq(crq); 176 continue; 177 } 178 179 /* synchronous messages are time critical and need preferential 180 * treatment. Therefore, we need to acknowledge all the sync 181 * responses as quickly as possible so that waiting tasks do not 182 * timeout and simultaneously queue the async messages for later 183 * prcessing in context of mailbox task i.e. the slow path. 184 */ 185 switch (req->msg[0]) { 186 case HCLGE_MBX_PF_VF_RESP: 187 if (resp->received_resp) 188 dev_warn(&hdev->pdev->dev, 189 "VF mbx resp flag not clear(%d)\n", 190 req->msg[1]); 191 resp->received_resp = true; 192 193 resp->origin_mbx_msg = (req->msg[1] << 16); 194 resp->origin_mbx_msg |= req->msg[2]; 195 resp->resp_status = req->msg[3]; 196 197 temp = (u8 *)&req->msg[4]; 198 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 199 resp->additional_info[i] = *temp; 200 temp++; 201 } 202 break; 203 case HCLGE_MBX_LINK_STAT_CHANGE: 204 case HCLGE_MBX_ASSERTING_RESET: 205 case HCLGE_MBX_LINK_STAT_MODE: 206 case HLCGE_MBX_PUSH_VLAN_INFO: 207 /* set this mbx event as pending. This is required as we 208 * might loose interrupt event when mbx task is busy 209 * handling. This shall be cleared when mbx task just 210 * enters handling state. 211 */ 212 hdev->mbx_event_pending = true; 213 214 /* we will drop the async msg if we find ARQ as full 215 * and continue with next message 216 */ 217 if (atomic_read(&hdev->arq.count) >= 218 HCLGE_MBX_MAX_ARQ_MSG_NUM) { 219 dev_warn(&hdev->pdev->dev, 220 "Async Q full, dropping msg(%d)\n", 221 req->msg[1]); 222 break; 223 } 224 225 /* tail the async message in arq */ 226 msg_q = hdev->arq.msg_q[hdev->arq.tail]; 227 memcpy(&msg_q[0], req->msg, 228 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 229 hclge_mbx_tail_ptr_move_arq(hdev->arq); 230 atomic_inc(&hdev->arq.count); 231 232 hclgevf_mbx_task_schedule(hdev); 233 234 break; 235 default: 236 dev_err(&hdev->pdev->dev, 237 "VF received unsupported(%d) mbx msg from PF\n", 238 req->msg[0]); 239 break; 240 } 241 crq->desc[crq->next_to_use].flag = 0; 242 hclge_mbx_ring_ptr_move_crq(crq); 243 } 244 245 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 246 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 247 crq->next_to_use); 248 } 249 250 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 251 { 252 enum hnae3_reset_type reset_type; 253 u16 link_status, state; 254 u16 *msg_q, *vlan_info; 255 u8 duplex; 256 u32 speed; 257 u32 tail; 258 u8 idx; 259 260 /* we can safely clear it now as we are at start of the async message 261 * processing 262 */ 263 hdev->mbx_event_pending = false; 264 265 tail = hdev->arq.tail; 266 267 /* process all the async queue messages */ 268 while (tail != hdev->arq.head) { 269 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 270 dev_info(&hdev->pdev->dev, 271 "vf crq need init in async\n"); 272 return; 273 } 274 275 msg_q = hdev->arq.msg_q[hdev->arq.head]; 276 277 switch (msg_q[0]) { 278 case HCLGE_MBX_LINK_STAT_CHANGE: 279 link_status = le16_to_cpu(msg_q[1]); 280 memcpy(&speed, &msg_q[2], sizeof(speed)); 281 duplex = (u8)le16_to_cpu(msg_q[4]); 282 283 /* update upper layer with new link link status */ 284 hclgevf_update_link_status(hdev, link_status); 285 hclgevf_update_speed_duplex(hdev, speed, duplex); 286 287 break; 288 case HCLGE_MBX_LINK_STAT_MODE: 289 idx = (u8)le16_to_cpu(msg_q[1]); 290 if (idx) 291 memcpy(&hdev->hw.mac.supported, &msg_q[2], 292 sizeof(unsigned long)); 293 else 294 memcpy(&hdev->hw.mac.advertising, &msg_q[2], 295 sizeof(unsigned long)); 296 break; 297 case HCLGE_MBX_ASSERTING_RESET: 298 /* PF has asserted reset hence VF should go in pending 299 * state and poll for the hardware reset status till it 300 * has been completely reset. After this stack should 301 * eventually be re-initialized. 302 */ 303 reset_type = le16_to_cpu(msg_q[1]); 304 set_bit(reset_type, &hdev->reset_pending); 305 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 306 hclgevf_reset_task_schedule(hdev); 307 308 break; 309 case HLCGE_MBX_PUSH_VLAN_INFO: 310 state = le16_to_cpu(msg_q[1]); 311 vlan_info = &msg_q[1]; 312 hclgevf_update_port_base_vlan_info(hdev, state, 313 (u8 *)vlan_info, 8); 314 break; 315 default: 316 dev_err(&hdev->pdev->dev, 317 "fetched unsupported(%d) message from arq\n", 318 msg_q[0]); 319 break; 320 } 321 322 hclge_mbx_head_ptr_move_arq(hdev->arq); 323 atomic_dec(&hdev->arq.count); 324 msg_q = hdev->arq.msg_q[hdev->arq.head]; 325 } 326 } 327