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_USCOEND   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                 udelay(HCLGEVF_SLEEP_USCOEND);
  44                 i++;
  45         }
  46
  47         if (i >= HCLGEVF_MAX_TRY_TIMES) {
  48                 dev_err(&hdev->pdev->dev,
  49                         "VF could not get mbx resp(=%d) from PF in %d tries\n",
  50                         hdev->mbx_resp.received_resp, i);
  51                 return -EIO;
  52         }
  53
  54         mbx_resp = &hdev->mbx_resp;
  55         r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
  56         r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
  57
  58         if (mbx_resp->resp_status)
  59                 return mbx_resp->resp_status;
  60
  61         if (resp_data)
  62                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
  63
  64         hclgevf_reset_mbx_resp_status(hdev);
  65
  66         if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
  67                 dev_err(&hdev->pdev->dev,
  68                         "VF could not match resp code(code0=%d,code1=%d), %d",
  69                         code0, code1, mbx_resp->resp_status);
  70                 return -EIO;
  71         }
  72
  73         return 0;
  74 }
  75
  76 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
  77                          const u8 *msg_data, u8 msg_len, bool need_resp,
  78                          u8 *resp_data, u16 resp_len)
  79 {
  80         struct hclge_mbx_vf_to_pf_cmd *req;
  81         struct hclgevf_desc desc;
  82         int status;
  83
  84         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
  85
  86         /* first two bytes are reserved for code & subcode */
  87         if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) {
  88                 dev_err(&hdev->pdev->dev,
  89                         "VF send mbx msg fail, msg len %d exceeds max len %d\n",
  90                         msg_len, HCLGE_MBX_MAX_MSG_SIZE);
  91                 return -EINVAL;
  92         }
  93
  94         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
  95         req->msg[0] = code;
  96         req->msg[1] = subcode;
  97         memcpy(&req->msg[2], msg_data, msg_len);
  98
  99         /* synchronous send */
 100         if (need_resp) {
 101                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
 102                 hclgevf_reset_mbx_resp_status(hdev);
 103                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 104                 if (status) {
 105                         dev_err(&hdev->pdev->dev,
 106                                 "VF failed(=%d) to send mbx message to PF\n",
 107                                 status);
 108                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 109                         return status;
 110                 }
 111
 112                 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data,
 113                                               resp_len);
 114                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 115         } else {
 116                 /* asynchronous send */
 117                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 118                 if (status) {
 119                         dev_err(&hdev->pdev->dev,
 120                                 "VF failed(=%d) to send mbx message to PF\n",
 121                                 status);
 122                         return status;
 123                 }
 124         }
 125
 126         return status;
 127 }
 128
 129 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 130 {
 131         u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
 132
 133         return tail == hw->cmq.crq.next_to_use;
 134 }
 135
 136 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 137 {
 138         struct hclgevf_mbx_resp_status *resp;
 139         struct hclge_mbx_pf_to_vf_cmd *req;
 140         struct hclgevf_cmq_ring *crq;
 141         struct hclgevf_desc *desc;
 142         u16 *msg_q;
 143         u16 flag;
 144         u8 *temp;
 145         int i;
 146
 147         resp = &hdev->mbx_resp;
 148         crq = &hdev->hw.cmq.crq;
 149
 150         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 151                 desc = &crq->desc[crq->next_to_use];
 152                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 153
 154                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 155                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 156                         dev_warn(&hdev->pdev->dev,
 157                                  "dropped invalid mailbox message, code = %d\n",
 158                                  req->msg[0]);
 159
 160                         /* dropping/not processing this invalid message */
 161                         crq->desc[crq->next_to_use].flag = 0;
 162                         hclge_mbx_ring_ptr_move_crq(crq);
 163                         continue;
 164                 }
 165
 166                 /* synchronous messages are time critical and need preferential
 167                  * treatment. Therefore, we need to acknowledge all the sync
 168                  * responses as quickly as possible so that waiting tasks do not
 169                  * timeout and simultaneously queue the async messages for later
 170                  * prcessing in context of mailbox task i.e. the slow path.
 171                  */
 172                 switch (req->msg[0]) {
 173                 case HCLGE_MBX_PF_VF_RESP:
 174                         if (resp->received_resp)
 175                                 dev_warn(&hdev->pdev->dev,
 176                                          "VF mbx resp flag not clear(%d)\n",
 177                                          req->msg[1]);
 178                         resp->received_resp = true;
 179
 180                         resp->origin_mbx_msg = (req->msg[1] << 16);
 181                         resp->origin_mbx_msg |= req->msg[2];
 182                         resp->resp_status = req->msg[3];
 183
 184                         temp = (u8 *)&req->msg[4];
 185                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 186                                 resp->additional_info[i] = *temp;
 187                                 temp++;
 188                         }
 189                         break;
 190                 case HCLGE_MBX_LINK_STAT_CHANGE:
 191                 case HCLGE_MBX_ASSERTING_RESET:
 192                         /* set this mbx event as pending. This is required as we
 193                          * might loose interrupt event when mbx task is busy
 194                          * handling. This shall be cleared when mbx task just
 195                          * enters handling state.
 196                          */
 197                         hdev->mbx_event_pending = true;
 198
 199                         /* we will drop the async msg if we find ARQ as full
 200                          * and continue with next message
 201                          */
 202                         if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 203                                 dev_warn(&hdev->pdev->dev,
 204                                          "Async Q full, dropping msg(%d)\n",
 205                                          req->msg[1]);
 206                                 break;
 207                         }
 208
 209                         /* tail the async message in arq */
 210                         msg_q = hdev->arq.msg_q[hdev->arq.tail];
 211                         memcpy(&msg_q[0], req->msg,
 212                                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 213                         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 214                         hdev->arq.count++;
 215
 216                         hclgevf_mbx_task_schedule(hdev);
 217
 218                         break;
 219                 default:
 220                         dev_err(&hdev->pdev->dev,
 221                                 "VF received unsupported(%d) mbx msg from PF\n",
 222                                 req->msg[0]);
 223                         break;
 224                 }
 225                 crq->desc[crq->next_to_use].flag = 0;
 226                 hclge_mbx_ring_ptr_move_crq(crq);
 227         }
 228
 229         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 230         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 231                           crq->next_to_use);
 232 }
 233
 234 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 235 {
 236         u16 link_status;
 237         u16 *msg_q;
 238         u8 duplex;
 239         u32 speed;
 240         u32 tail;
 241
 242         /* we can safely clear it now as we are at start of the async message
 243          * processing
 244          */
 245         hdev->mbx_event_pending = false;
 246
 247         tail = hdev->arq.tail;
 248
 249         /* process all the async queue messages */
 250         while (tail != hdev->arq.head) {
 251                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 252
 253                 switch (msg_q[0]) {
 254                 case HCLGE_MBX_LINK_STAT_CHANGE:
 255                         link_status = le16_to_cpu(msg_q[1]);
 256                         memcpy(&speed, &msg_q[2], sizeof(speed));
 257                         duplex = (u8)le16_to_cpu(msg_q[4]);
 258
 259                         /* update upper layer with new link link status */
 260                         hclgevf_update_link_status(hdev, link_status);
 261                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 262
 263                         break;
 264                 case HCLGE_MBX_ASSERTING_RESET:
 265                         /* PF has asserted reset hence VF should go in pending
 266                          * state and poll for the hardware reset status till it
 267                          * has been completely reset. After this stack should
 268                          * eventually be re-initialized.
 269                          */
 270                         hdev->nic.reset_level = HNAE3_VF_RESET;
 271                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 272                         hclgevf_reset_task_schedule(hdev);
 273
 274                         break;
 275                 default:
 276                         dev_err(&hdev->pdev->dev,
 277                                 "fetched unsupported(%d) message from arq\n",
 278                                 msg_q[0]);
 279                         break;
 280                 }
 281
 282                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 283                 hdev->arq.count--;
 284                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 285         }
 286 }