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