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 protect 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  * @code0: the message opcode VF send to PF.
  36  * @code1: the message sub-opcode VF send to PF.
  37  * @resp_data: pointer to store response data from PF to VF.
  38  * @resp_len: the length of resp_data from PF to VF.
  39  */
  40 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
  41                                 u8 *resp_data, u16 resp_len)
  42 {
  43 #define HCLGEVF_MAX_TRY_TIMES   500
  44 #define HCLGEVF_SLEEP_USECOND   1000
  45         struct hclgevf_mbx_resp_status *mbx_resp;
  46         u16 r_code0, r_code1;
  47         int i = 0;
  48
  49         if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
  50                 dev_err(&hdev->pdev->dev,
  51                         "VF mbx response len(=%u) exceeds maximum(=%u)\n",
  52                         resp_len,
  53                         HCLGE_MBX_MAX_RESP_DATA_SIZE);
  54                 return -EINVAL;
  55         }
  56
  57         while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
  58                 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
  59                              &hdev->hw.hw.comm_state))
  60                         return -EIO;
  61
  62                 usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
  63                 i++;
  64         }
  65
  66         /* ensure additional_info will be seen after received_resp */
  67         smp_rmb();
  68
  69         if (i >= HCLGEVF_MAX_TRY_TIMES) {
  70                 dev_err(&hdev->pdev->dev,
  71                         "VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
  72                         code0, code1, hdev->mbx_resp.received_resp, i);
  73                 return -EIO;
  74         }
  75
  76         mbx_resp = &hdev->mbx_resp;
  77         r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
  78         r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
  79
  80         if (mbx_resp->resp_status)
  81                 return mbx_resp->resp_status;
  82
  83         if (resp_data)
  84                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
  85
  86         hclgevf_reset_mbx_resp_status(hdev);
  87
  88         if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
  89                 dev_err(&hdev->pdev->dev,
  90                         "VF could not match resp code(code0=%u,code1=%u), %d\n",
  91                         code0, code1, mbx_resp->resp_status);
  92                 dev_err(&hdev->pdev->dev,
  93                         "VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
  94                         r_code0, r_code1);
  95                 return -EIO;
  96         }
  97
  98         return 0;
  99 }
 100
 101 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
 102                          struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
 103                          u8 *resp_data, u16 resp_len)
 104 {
 105         struct hclge_mbx_vf_to_pf_cmd *req;
 106         struct hclge_desc desc;
 107         int status;
 108
 109         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
 110
 111         if (!send_msg) {
 112                 dev_err(&hdev->pdev->dev,
 113                         "failed to send mbx, msg is NULL\n");
 114                 return -EINVAL;
 115         }
 116
 117         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
 118         if (need_resp)
 119                 hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);
 120
 121         memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));
 122
 123         if (test_bit(HCLGEVF_STATE_NIC_REGISTERED, &hdev->state))
 124                 trace_hclge_vf_mbx_send(hdev, req);
 125
 126         /* synchronous send */
 127         if (need_resp) {
 128                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
 129                 hclgevf_reset_mbx_resp_status(hdev);
 130                 req->match_id = cpu_to_le16(hdev->mbx_resp.match_id);
 131                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 132                 if (status) {
 133                         dev_err(&hdev->pdev->dev,
 134                                 "VF failed(=%d) to send mbx message to PF\n",
 135                                 status);
 136                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 137                         return status;
 138                 }
 139
 140                 status = hclgevf_get_mbx_resp(hdev, send_msg->code,
 141                                               send_msg->subcode, resp_data,
 142                                               resp_len);
 143                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 144         } else {
 145                 /* asynchronous send */
 146                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 147                 if (status) {
 148                         dev_err(&hdev->pdev->dev,
 149                                 "VF failed(=%d) to send mbx message to PF\n",
 150                                 status);
 151                         return status;
 152                 }
 153         }
 154
 155         return status;
 156 }
 157
 158 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 159 {
 160         u32 tail = hclgevf_read_dev(hw, HCLGE_COMM_NIC_CRQ_TAIL_REG);
 161
 162         return tail == hw->hw.cmq.crq.next_to_use;
 163 }
 164
 165 static void hclgevf_handle_mbx_response(struct hclgevf_dev *hdev,
 166                                         struct hclge_mbx_pf_to_vf_cmd *req)
 167 {
 168         u16 vf_mbx_msg_subcode = le16_to_cpu(req->msg.vf_mbx_msg_subcode);
 169         u16 vf_mbx_msg_code = le16_to_cpu(req->msg.vf_mbx_msg_code);
 170         struct hclgevf_mbx_resp_status *resp = &hdev->mbx_resp;
 171         u16 resp_status = le16_to_cpu(req->msg.resp_status);
 172         u16 match_id = le16_to_cpu(req->match_id);
 173
 174         if (resp->received_resp)
 175                 dev_warn(&hdev->pdev->dev,
 176                         "VF mbx resp flag not clear(%u)\n",
 177                          vf_mbx_msg_code);
 178
 179         resp->origin_mbx_msg = (vf_mbx_msg_code << 16);
 180         resp->origin_mbx_msg |= vf_mbx_msg_subcode;
 181         resp->resp_status = hclgevf_resp_to_errno(resp_status);
 182         memcpy(resp->additional_info, req->msg.resp_data,
 183                HCLGE_MBX_MAX_RESP_DATA_SIZE * sizeof(u8));
 184
 185         /* ensure additional_info will be seen before setting received_resp */
 186         smp_wmb();
 187
 188         if (match_id) {
 189                 /* If match_id is not zero, it means PF support match_id.
 190                  * if the match_id is right, VF get the right response, or
 191                  * ignore the response. and driver will clear hdev->mbx_resp
 192                  * when send next message which need response.
 193                  */
 194                 if (match_id == resp->match_id)
 195                         resp->received_resp = true;
 196         } else {
 197                 resp->received_resp = true;
 198         }
 199 }
 200
 201 static void hclgevf_handle_mbx_msg(struct hclgevf_dev *hdev,
 202                                    struct hclge_mbx_pf_to_vf_cmd *req)
 203 {
 204         /* we will drop the async msg if we find ARQ as full
 205          * and continue with next message
 206          */
 207         if (atomic_read(&hdev->arq.count) >=
 208             HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 209                 dev_warn(&hdev->pdev->dev,
 210                          "Async Q full, dropping msg(%u)\n",
 211                          le16_to_cpu(req->msg.code));
 212                 return;
 213         }
 214
 215         /* tail the async message in arq */
 216         memcpy(hdev->arq.msg_q[hdev->arq.tail], &req->msg,
 217                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 218         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 219         atomic_inc(&hdev->arq.count);
 220
 221         hclgevf_mbx_task_schedule(hdev);
 222 }
 223
 224 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 225 {
 226         struct hclge_mbx_pf_to_vf_cmd *req;
 227         struct hclge_comm_cmq_ring *crq;
 228         struct hclge_desc *desc;
 229         u16 flag;
 230         u16 code;
 231
 232         crq = &hdev->hw.hw.cmq.crq;
 233
 234         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 235                 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
 236                              &hdev->hw.hw.comm_state)) {
 237                         dev_info(&hdev->pdev->dev, "vf crq need init\n");
 238                         return;
 239                 }
 240
 241                 desc = &crq->desc[crq->next_to_use];
 242                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 243
 244                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 245                 code = le16_to_cpu(req->msg.code);
 246                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 247                         dev_warn(&hdev->pdev->dev,
 248                                  "dropped invalid mailbox message, code = %u\n",
 249                                  code);
 250
 251                         /* dropping/not processing this invalid message */
 252                         crq->desc[crq->next_to_use].flag = 0;
 253                         hclge_mbx_ring_ptr_move_crq(crq);
 254                         continue;
 255                 }
 256
 257                 trace_hclge_vf_mbx_get(hdev, req);
 258
 259                 /* synchronous messages are time critical and need preferential
 260                  * treatment. Therefore, we need to acknowledge all the sync
 261                  * responses as quickly as possible so that waiting tasks do not
 262                  * timeout and simultaneously queue the async messages for later
 263                  * prcessing in context of mailbox task i.e. the slow path.
 264                  */
 265                 switch (code) {
 266                 case HCLGE_MBX_PF_VF_RESP:
 267                         hclgevf_handle_mbx_response(hdev, req);
 268                         break;
 269                 case HCLGE_MBX_LINK_STAT_CHANGE:
 270                 case HCLGE_MBX_ASSERTING_RESET:
 271                 case HCLGE_MBX_LINK_STAT_MODE:
 272                 case HCLGE_MBX_PUSH_VLAN_INFO:
 273                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 274                         hclgevf_handle_mbx_msg(hdev, req);
 275                         break;
 276                 default:
 277                         dev_err(&hdev->pdev->dev,
 278                                 "VF received unsupported(%u) mbx msg from PF\n",
 279                                 code);
 280                         break;
 281                 }
 282                 crq->desc[crq->next_to_use].flag = 0;
 283                 hclge_mbx_ring_ptr_move_crq(crq);
 284         }
 285
 286         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 287         hclgevf_write_dev(&hdev->hw, HCLGE_COMM_NIC_CRQ_HEAD_REG,
 288                           crq->next_to_use);
 289 }
 290
 291 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
 292                                        u16 promisc_info)
 293 {
 294         if (!promisc_info)
 295                 dev_info(&hdev->pdev->dev,
 296                          "Promisc mode is closed by host for being untrusted.\n");
 297 }
 298
 299 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 300 {
 301         struct hclge_mbx_port_base_vlan *vlan_info;
 302         struct hclge_mbx_link_status *link_info;
 303         struct hclge_mbx_link_mode *link_mode;
 304         enum hnae3_reset_type reset_type;
 305         u16 link_status, state;
 306         __le16 *msg_q;
 307         u16 opcode;
 308         u8 duplex;
 309         u32 speed;
 310         u32 tail;
 311         u8 flag;
 312         u16 idx;
 313
 314         tail = hdev->arq.tail;
 315
 316         /* process all the async queue messages */
 317         while (tail != hdev->arq.head) {
 318                 if (test_bit(HCLGE_COMM_STATE_CMD_DISABLE,
 319                              &hdev->hw.hw.comm_state)) {
 320                         dev_info(&hdev->pdev->dev,
 321                                  "vf crq need init in async\n");
 322                         return;
 323                 }
 324
 325                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 326                 opcode = le16_to_cpu(msg_q[0]);
 327                 switch (opcode) {
 328                 case HCLGE_MBX_LINK_STAT_CHANGE:
 329                         link_info = (struct hclge_mbx_link_status *)(msg_q + 1);
 330                         link_status = le16_to_cpu(link_info->link_status);
 331                         speed = le32_to_cpu(link_info->speed);
 332                         duplex = (u8)le16_to_cpu(link_info->duplex);
 333                         flag = link_info->flag;
 334
 335                         /* update upper layer with new link link status */
 336                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 337                         hclgevf_update_link_status(hdev, link_status);
 338
 339                         if (flag & HCLGE_MBX_PUSH_LINK_STATUS_EN)
 340                                 set_bit(HCLGEVF_STATE_PF_PUSH_LINK_STATUS,
 341                                         &hdev->state);
 342
 343                         break;
 344                 case HCLGE_MBX_LINK_STAT_MODE:
 345                         link_mode = (struct hclge_mbx_link_mode *)(msg_q + 1);
 346                         idx = le16_to_cpu(link_mode->idx);
 347                         if (idx)
 348                                 hdev->hw.mac.supported =
 349                                         le64_to_cpu(link_mode->link_mode);
 350                         else
 351                                 hdev->hw.mac.advertising =
 352                                         le64_to_cpu(link_mode->link_mode);
 353                         break;
 354                 case HCLGE_MBX_ASSERTING_RESET:
 355                         /* PF has asserted reset hence VF should go in pending
 356                          * state and poll for the hardware reset status till it
 357                          * has been completely reset. After this stack should
 358                          * eventually be re-initialized.
 359                          */
 360                         reset_type =
 361                                 (enum hnae3_reset_type)le16_to_cpu(msg_q[1]);
 362                         set_bit(reset_type, &hdev->reset_pending);
 363                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 364                         hclgevf_reset_task_schedule(hdev);
 365
 366                         break;
 367                 case HCLGE_MBX_PUSH_VLAN_INFO:
 368                         vlan_info =
 369                                 (struct hclge_mbx_port_base_vlan *)(msg_q + 1);
 370                         state = le16_to_cpu(vlan_info->state);
 371                         hclgevf_update_port_base_vlan_info(hdev, state,
 372                                                            vlan_info);
 373                         break;
 374                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 375                         hclgevf_parse_promisc_info(hdev, le16_to_cpu(msg_q[1]));
 376                         break;
 377                 default:
 378                         dev_err(&hdev->pdev->dev,
 379                                 "fetched unsupported(%u) message from arq\n",
 380                                 opcode);
 381                         break;
 382                 }
 383
 384                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 385                 atomic_dec(&hdev->arq.count);
 386                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 387         }
 388 }