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 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 resp(=%d) from PF in %d tries\n",
  53                         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",
  72                         code0, code1, mbx_resp->resp_status);
  73                 return -EIO;
  74         }
  75
  76         return 0;
  77 }
  78
  79 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
  80                          const u8 *msg_data, u8 msg_len, bool need_resp,
  81                          u8 *resp_data, u16 resp_len)
  82 {
  83         struct hclge_mbx_vf_to_pf_cmd *req;
  84         struct hclgevf_desc desc;
  85         int status;
  86
  87         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
  88
  89         /* first two bytes are reserved for code & subcode */
  90         if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) {
  91                 dev_err(&hdev->pdev->dev,
  92                         "VF send mbx msg fail, msg len %d exceeds max len %d\n",
  93                         msg_len, HCLGE_MBX_MAX_MSG_SIZE);
  94                 return -EINVAL;
  95         }
  96
  97         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
  98         req->msg[0] = code;
  99         req->msg[1] = subcode;
 100         memcpy(&req->msg[2], msg_data, msg_len);
 101
 102         /* synchronous send */
 103         if (need_resp) {
 104                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
 105                 hclgevf_reset_mbx_resp_status(hdev);
 106                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 107                 if (status) {
 108                         dev_err(&hdev->pdev->dev,
 109                                 "VF failed(=%d) to send mbx message to PF\n",
 110                                 status);
 111                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 112                         return status;
 113                 }
 114
 115                 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data,
 116                                               resp_len);
 117                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 118         } else {
 119                 /* asynchronous send */
 120                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 121                 if (status) {
 122                         dev_err(&hdev->pdev->dev,
 123                                 "VF failed(=%d) to send mbx message to PF\n",
 124                                 status);
 125                         return status;
 126                 }
 127         }
 128
 129         return status;
 130 }
 131
 132 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 133 {
 134         u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
 135
 136         return tail == hw->cmq.crq.next_to_use;
 137 }
 138
 139 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 140 {
 141         struct hclgevf_mbx_resp_status *resp;
 142         struct hclge_mbx_pf_to_vf_cmd *req;
 143         struct hclgevf_cmq_ring *crq;
 144         struct hclgevf_desc *desc;
 145         u16 *msg_q;
 146         u16 flag;
 147         u8 *temp;
 148         int i;
 149
 150         resp = &hdev->mbx_resp;
 151         crq = &hdev->hw.cmq.crq;
 152
 153         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 154                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 155                         dev_info(&hdev->pdev->dev, "vf crq need init\n");
 156                         return;
 157                 }
 158
 159                 desc = &crq->desc[crq->next_to_use];
 160                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 161
 162                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 163                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 164                         dev_warn(&hdev->pdev->dev,
 165                                  "dropped invalid mailbox message, code = %d\n",
 166                                  req->msg[0]);
 167
 168                         /* dropping/not processing this invalid message */
 169                         crq->desc[crq->next_to_use].flag = 0;
 170                         hclge_mbx_ring_ptr_move_crq(crq);
 171                         continue;
 172                 }
 173
 174                 /* synchronous messages are time critical and need preferential
 175                  * treatment. Therefore, we need to acknowledge all the sync
 176                  * responses as quickly as possible so that waiting tasks do not
 177                  * timeout and simultaneously queue the async messages for later
 178                  * prcessing in context of mailbox task i.e. the slow path.
 179                  */
 180                 switch (req->msg[0]) {
 181                 case HCLGE_MBX_PF_VF_RESP:
 182                         if (resp->received_resp)
 183                                 dev_warn(&hdev->pdev->dev,
 184                                          "VF mbx resp flag not clear(%d)\n",
 185                                          req->msg[1]);
 186                         resp->received_resp = true;
 187
 188                         resp->origin_mbx_msg = (req->msg[1] << 16);
 189                         resp->origin_mbx_msg |= req->msg[2];
 190                         resp->resp_status = req->msg[3];
 191
 192                         temp = (u8 *)&req->msg[4];
 193                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 194                                 resp->additional_info[i] = *temp;
 195                                 temp++;
 196                         }
 197                         break;
 198                 case HCLGE_MBX_LINK_STAT_CHANGE:
 199                 case HCLGE_MBX_ASSERTING_RESET:
 200                 case HCLGE_MBX_LINK_STAT_MODE:
 201                         /* set this mbx event as pending. This is required as we
 202                          * might loose interrupt event when mbx task is busy
 203                          * handling. This shall be cleared when mbx task just
 204                          * enters handling state.
 205                          */
 206                         hdev->mbx_event_pending = true;
 207
 208                         /* we will drop the async msg if we find ARQ as full
 209                          * and continue with next message
 210                          */
 211                         if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 212                                 dev_warn(&hdev->pdev->dev,
 213                                          "Async Q full, dropping msg(%d)\n",
 214                                          req->msg[1]);
 215                                 break;
 216                         }
 217
 218                         /* tail the async message in arq */
 219                         msg_q = hdev->arq.msg_q[hdev->arq.tail];
 220                         memcpy(&msg_q[0], req->msg,
 221                                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 222                         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 223                         hdev->arq.count++;
 224
 225                         hclgevf_mbx_task_schedule(hdev);
 226
 227                         break;
 228                 default:
 229                         dev_err(&hdev->pdev->dev,
 230                                 "VF received unsupported(%d) mbx msg from PF\n",
 231                                 req->msg[0]);
 232                         break;
 233                 }
 234                 crq->desc[crq->next_to_use].flag = 0;
 235                 hclge_mbx_ring_ptr_move_crq(crq);
 236         }
 237
 238         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 239         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 240                           crq->next_to_use);
 241 }
 242
 243 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 244 {
 245         enum hnae3_reset_type reset_type;
 246         u16 link_status;
 247         u16 *msg_q;
 248         u8 duplex;
 249         u32 speed;
 250         u32 tail;
 251         u8 idx;
 252
 253         /* we can safely clear it now as we are at start of the async message
 254          * processing
 255          */
 256         hdev->mbx_event_pending = false;
 257
 258         tail = hdev->arq.tail;
 259
 260         /* process all the async queue messages */
 261         while (tail != hdev->arq.head) {
 262                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 263                         dev_info(&hdev->pdev->dev,
 264                                  "vf crq need init in async\n");
 265                         return;
 266                 }
 267
 268                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 269
 270                 switch (msg_q[0]) {
 271                 case HCLGE_MBX_LINK_STAT_CHANGE:
 272                         link_status = le16_to_cpu(msg_q[1]);
 273                         memcpy(&speed, &msg_q[2], sizeof(speed));
 274                         duplex = (u8)le16_to_cpu(msg_q[4]);
 275                         hdev->hw.mac.media_type = (u8)le16_to_cpu(msg_q[5]);
 276
 277                         /* update upper layer with new link link status */
 278                         hclgevf_update_link_status(hdev, link_status);
 279                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 280
 281                         break;
 282                 case HCLGE_MBX_LINK_STAT_MODE:
 283                         idx = (u8)le16_to_cpu(msg_q[1]);
 284                         if (idx)
 285                                 memcpy(&hdev->hw.mac.supported, &msg_q[2],
 286                                        sizeof(unsigned long));
 287                         else
 288                                 memcpy(&hdev->hw.mac.advertising, &msg_q[2],
 289                                        sizeof(unsigned long));
 290                         break;
 291                 case HCLGE_MBX_ASSERTING_RESET:
 292                         /* PF has asserted reset hence VF should go in pending
 293                          * state and poll for the hardware reset status till it
 294                          * has been completely reset. After this stack should
 295                          * eventually be re-initialized.
 296                          */
 297                         reset_type = le16_to_cpu(msg_q[1]);
 298                         set_bit(reset_type, &hdev->reset_pending);
 299                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 300                         hclgevf_reset_task_schedule(hdev);
 301
 302                         break;
 303                 default:
 304                         dev_err(&hdev->pdev->dev,
 305                                 "fetched unsupported(%d) message from arq\n",
 306                                 msg_q[0]);
 307                         break;
 308                 }
 309
 310                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 311                 hdev->arq.count--;
 312                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 313         }
 314 }