drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c

   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 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 159 {
 160         struct hclgevf_mbx_resp_status *resp;
 161         struct hclge_mbx_pf_to_vf_cmd *req;
 162         struct hclgevf_cmq_ring *crq;
 163         struct hclgevf_desc *desc;
 164         u16 *msg_q;
 165         u16 flag;
 166         u8 *temp;
 167         int i;
 168
 169         resp = &hdev->mbx_resp;
 170         crq = &hdev->hw.cmq.crq;
 171
 172         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 173                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 174                         dev_info(&hdev->pdev->dev, "vf crq need init\n");
 175                         return;
 176                 }
 177
 178                 desc = &crq->desc[crq->next_to_use];
 179                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 180
 181                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 182                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 183                         dev_warn(&hdev->pdev->dev,
 184                                  "dropped invalid mailbox message, code = %u\n",
 185                                  req->msg.code);
 186
 187                         /* dropping/not processing this invalid message */
 188                         crq->desc[crq->next_to_use].flag = 0;
 189                         hclge_mbx_ring_ptr_move_crq(crq);
 190                         continue;
 191                 }
 192
 193                 trace_hclge_vf_mbx_get(hdev, req);
 194
 195                 /* synchronous messages are time critical and need preferential
 196                  * treatment. Therefore, we need to acknowledge all the sync
 197                  * responses as quickly as possible so that waiting tasks do not
 198                  * timeout and simultaneously queue the async messages for later
 199                  * prcessing in context of mailbox task i.e. the slow path.
 200                  */
 201                 switch (req->msg.code) {
 202                 case HCLGE_MBX_PF_VF_RESP:
 203                         if (resp->received_resp)
 204                                 dev_warn(&hdev->pdev->dev,
 205                                          "VF mbx resp flag not clear(%u)\n",
 206                                          req->msg.vf_mbx_msg_code);
 207                         resp->received_resp = true;
 208
 209                         resp->origin_mbx_msg =
 210                                         (req->msg.vf_mbx_msg_code << 16);
 211                         resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode;
 212                         resp->resp_status =
 213                                 hclgevf_resp_to_errno(req->msg.resp_status);
 214
 215                         temp = (u8 *)req->msg.resp_data;
 216                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 217                                 resp->additional_info[i] = *temp;
 218                                 temp++;
 219                         }
 220
 221                         /* If match_id is not zero, it means PF support
 222                          * match_id. If the match_id is right, VF get the
 223                          * right response, otherwise ignore the response.
 224                          * Driver will clear hdev->mbx_resp when send
 225                          * next message which need response.
 226                          */
 227                         if (req->match_id) {
 228                                 if (req->match_id == resp->match_id)
 229                                         resp->received_resp = true;
 230                         } else {
 231                                 resp->received_resp = true;
 232                         }
 233                         break;
 234                 case HCLGE_MBX_LINK_STAT_CHANGE:
 235                 case HCLGE_MBX_ASSERTING_RESET:
 236                 case HCLGE_MBX_LINK_STAT_MODE:
 237                 case HCLGE_MBX_PUSH_VLAN_INFO:
 238                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 239                         /* set this mbx event as pending. This is required as we
 240                          * might loose interrupt event when mbx task is busy
 241                          * handling. This shall be cleared when mbx task just
 242                          * enters handling state.
 243                          */
 244                         hdev->mbx_event_pending = true;
 245
 246                         /* we will drop the async msg if we find ARQ as full
 247                          * and continue with next message
 248                          */
 249                         if (atomic_read(&hdev->arq.count) >=
 250                             HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 251                                 dev_warn(&hdev->pdev->dev,
 252                                          "Async Q full, dropping msg(%u)\n",
 253                                          req->msg.code);
 254                                 break;
 255                         }
 256
 257                         /* tail the async message in arq */
 258                         msg_q = hdev->arq.msg_q[hdev->arq.tail];
 259                         memcpy(&msg_q[0], &req->msg,
 260                                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 261                         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 262                         atomic_inc(&hdev->arq.count);
 263
 264                         hclgevf_mbx_task_schedule(hdev);
 265
 266                         break;
 267                 default:
 268                         dev_err(&hdev->pdev->dev,
 269                                 "VF received unsupported(%u) mbx msg from PF\n",
 270                                 req->msg.code);
 271                         break;
 272                 }
 273                 crq->desc[crq->next_to_use].flag = 0;
 274                 hclge_mbx_ring_ptr_move_crq(crq);
 275         }
 276
 277         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 278         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 279                           crq->next_to_use);
 280 }
 281
 282 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
 283                                        u16 promisc_info)
 284 {
 285         if (!promisc_info)
 286                 dev_info(&hdev->pdev->dev,
 287                          "Promisc mode is closed by host for being untrusted.\n");
 288 }
 289
 290 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 291 {
 292         enum hnae3_reset_type reset_type;
 293         u16 link_status, state;
 294         u16 *msg_q, *vlan_info;
 295         u8 duplex;
 296         u32 speed;
 297         u32 tail;
 298         u8 flag;
 299         u8 idx;
 300
 301         /* we can safely clear it now as we are at start of the async message
 302          * processing
 303          */
 304         hdev->mbx_event_pending = false;
 305
 306         tail = hdev->arq.tail;
 307
 308         /* process all the async queue messages */
 309         while (tail != hdev->arq.head) {
 310                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 311                         dev_info(&hdev->pdev->dev,
 312                                  "vf crq need init in async\n");
 313                         return;
 314                 }
 315
 316                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 317
 318                 switch (msg_q[0]) {
 319                 case HCLGE_MBX_LINK_STAT_CHANGE:
 320                         link_status = msg_q[1];
 321                         memcpy(&speed, &msg_q[2], sizeof(speed));
 322                         duplex = (u8)msg_q[4];
 323                         flag = (u8)msg_q[5];
 324
 325                         /* update upper layer with new link link status */
 326                         hclgevf_update_link_status(hdev, link_status);
 327                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 328
 329                         if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
 330                                 set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
 331                                         &hdev->state);
 332
 333                         break;
 334                 case HCLGE_MBX_LINK_STAT_MODE:
 335                         idx = (u8)msg_q[1];
 336                         if (idx)
 337                                 memcpy(&hdev->hw.mac.supported, &msg_q[2],
 338                                        sizeof(unsigned long));
 339                         else
 340                                 memcpy(&hdev->hw.mac.advertising, &msg_q[2],
 341                                        sizeof(unsigned long));
 342                         break;
 343                 case HCLGE_MBX_ASSERTING_RESET:
 344                         /* PF has asserted reset hence VF should go in pending
 345                          * state and poll for the hardware reset status till it
 346                          * has been completely reset. After this stack should
 347                          * eventually be re-initialized.
 348                          */
 349                         reset_type = (enum hnae3_reset_type)msg_q[1];
 350                         set_bit(reset_type, &hdev->reset_pending);
 351                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 352                         hclgevf_reset_task_schedule(hdev);
 353
 354                         break;
 355                 case HCLGE_MBX_PUSH_VLAN_INFO:
 356                         state = msg_q[1];
 357                         vlan_info = &msg_q[1];
 358                         hclgevf_update_port_base_vlan_info(hdev, state,
 359                                                            (u8 *)vlan_info, 8);
 360                         break;
 361                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 362                         hclgevf_parse_promisc_info(hdev, msg_q[1]);
 363                         break;
 364                 default:
 365                         dev_err(&hdev->pdev->dev,
 366                                 "fetched unsupported(%u) message from arq\n",
 367                                 msg_q[0]);
 368                         break;
 369                 }
 370
 371                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 372                 atomic_dec(&hdev->arq.count);
 373                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 374         }
 375 }