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

DEFINITIONS

1. hclgevf_reset_mbx_resp_status
2. hclgevf_get_mbx_resp
3. hclgevf_send_mbx_msg
4. hclgevf_cmd_crq_empty
5. hclgevf_mbx_handler
6. hclgevf_mbx_async_handler

   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(%d,%d) resp(=%d) from PF in %d tries\n",
  53                         code0, code1, 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\n",
  72                         code0, code1, mbx_resp->resp_status);
  73                 dev_err(&hdev->pdev->dev,
  74                         "VF could not match resp r_code(r_code0=%d,r_code1=%d)\n",
  75                         r_code0, r_code1);
  76                 return -EIO;
  77         }
  78 
  79         return 0;
  80 }
  81 
  82 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
  83                          const u8 *msg_data, u8 msg_len, bool need_resp,
  84                          u8 *resp_data, u16 resp_len)
  85 {
  86         struct hclge_mbx_vf_to_pf_cmd *req;
  87         struct hclgevf_desc desc;
  88         int status;
  89 
  90         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
  91 
  92         /* first two bytes are reserved for code & subcode */
  93         if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) {
  94                 dev_err(&hdev->pdev->dev,
  95                         "VF send mbx msg fail, msg len %d exceeds max len %d\n",
  96                         msg_len, HCLGE_MBX_MAX_MSG_SIZE);
  97                 return -EINVAL;
  98         }
  99 
 100         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
 101         req->mbx_need_resp |= need_resp ? HCLGE_MBX_NEED_RESP_BIT :
 102                                           ~HCLGE_MBX_NEED_RESP_BIT;
 103         req->msg[0] = code;
 104         req->msg[1] = subcode;
 105         if (msg_data)
 106                 memcpy(&req->msg[2], msg_data, msg_len);
 107 
 108         /* synchronous send */
 109         if (need_resp) {
 110                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
 111                 hclgevf_reset_mbx_resp_status(hdev);
 112                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 113                 if (status) {
 114                         dev_err(&hdev->pdev->dev,
 115                                 "VF failed(=%d) to send mbx message to PF\n",
 116                                 status);
 117                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 118                         return status;
 119                 }
 120 
 121                 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data,
 122                                               resp_len);
 123                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 124         } else {
 125                 /* asynchronous send */
 126                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 127                 if (status) {
 128                         dev_err(&hdev->pdev->dev,
 129                                 "VF failed(=%d) to send mbx message to PF\n",
 130                                 status);
 131                         return status;
 132                 }
 133         }
 134 
 135         return status;
 136 }
 137 
 138 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 139 {
 140         u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
 141 
 142         return tail == hw->cmq.crq.next_to_use;
 143 }
 144 
 145 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 146 {
 147         struct hclgevf_mbx_resp_status *resp;
 148         struct hclge_mbx_pf_to_vf_cmd *req;
 149         struct hclgevf_cmq_ring *crq;
 150         struct hclgevf_desc *desc;
 151         u16 *msg_q;
 152         u16 flag;
 153         u8 *temp;
 154         int i;
 155 
 156         resp = &hdev->mbx_resp;
 157         crq = &hdev->hw.cmq.crq;
 158 
 159         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 160                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 161                         dev_info(&hdev->pdev->dev, "vf crq need init\n");
 162                         return;
 163                 }
 164 
 165                 desc = &crq->desc[crq->next_to_use];
 166                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 167 
 168                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 169                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 170                         dev_warn(&hdev->pdev->dev,
 171                                  "dropped invalid mailbox message, code = %d\n",
 172                                  req->msg[0]);
 173 
 174                         /* dropping/not processing this invalid message */
 175                         crq->desc[crq->next_to_use].flag = 0;
 176                         hclge_mbx_ring_ptr_move_crq(crq);
 177                         continue;
 178                 }
 179 
 180                 /* synchronous messages are time critical and need preferential
 181                  * treatment. Therefore, we need to acknowledge all the sync
 182                  * responses as quickly as possible so that waiting tasks do not
 183                  * timeout and simultaneously queue the async messages for later
 184                  * prcessing in context of mailbox task i.e. the slow path.
 185                  */
 186                 switch (req->msg[0]) {
 187                 case HCLGE_MBX_PF_VF_RESP:
 188                         if (resp->received_resp)
 189                                 dev_warn(&hdev->pdev->dev,
 190                                          "VF mbx resp flag not clear(%d)\n",
 191                                          req->msg[1]);
 192                         resp->received_resp = true;
 193 
 194                         resp->origin_mbx_msg = (req->msg[1] << 16);
 195                         resp->origin_mbx_msg |= req->msg[2];
 196                         resp->resp_status = req->msg[3];
 197 
 198                         temp = (u8 *)&req->msg[4];
 199                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 200                                 resp->additional_info[i] = *temp;
 201                                 temp++;
 202                         }
 203                         break;
 204                 case HCLGE_MBX_LINK_STAT_CHANGE:
 205                 case HCLGE_MBX_ASSERTING_RESET:
 206                 case HCLGE_MBX_LINK_STAT_MODE:
 207                 case HCLGE_MBX_PUSH_VLAN_INFO:
 208                         /* set this mbx event as pending. This is required as we
 209                          * might loose interrupt event when mbx task is busy
 210                          * handling. This shall be cleared when mbx task just
 211                          * enters handling state.
 212                          */
 213                         hdev->mbx_event_pending = true;
 214 
 215                         /* we will drop the async msg if we find ARQ as full
 216                          * and continue with next message
 217                          */
 218                         if (atomic_read(&hdev->arq.count) >=
 219                             HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 220                                 dev_warn(&hdev->pdev->dev,
 221                                          "Async Q full, dropping msg(%d)\n",
 222                                          req->msg[1]);
 223                                 break;
 224                         }
 225 
 226                         /* tail the async message in arq */
 227                         msg_q = hdev->arq.msg_q[hdev->arq.tail];
 228                         memcpy(&msg_q[0], req->msg,
 229                                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 230                         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 231                         atomic_inc(&hdev->arq.count);
 232 
 233                         hclgevf_mbx_task_schedule(hdev);
 234 
 235                         break;
 236                 default:
 237                         dev_err(&hdev->pdev->dev,
 238                                 "VF received unsupported(%d) mbx msg from PF\n",
 239                                 req->msg[0]);
 240                         break;
 241                 }
 242                 crq->desc[crq->next_to_use].flag = 0;
 243                 hclge_mbx_ring_ptr_move_crq(crq);
 244         }
 245 
 246         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 247         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 248                           crq->next_to_use);
 249 }
 250 
 251 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 252 {
 253         enum hnae3_reset_type reset_type;
 254         u16 link_status, state;
 255         u16 *msg_q, *vlan_info;
 256         u8 duplex;
 257         u32 speed;
 258         u32 tail;
 259         u8 idx;
 260 
 261         /* we can safely clear it now as we are at start of the async message
 262          * processing
 263          */
 264         hdev->mbx_event_pending = false;
 265 
 266         tail = hdev->arq.tail;
 267 
 268         /* process all the async queue messages */
 269         while (tail != hdev->arq.head) {
 270                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 271                         dev_info(&hdev->pdev->dev,
 272                                  "vf crq need init in async\n");
 273                         return;
 274                 }
 275 
 276                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 277 
 278                 switch (msg_q[0]) {
 279                 case HCLGE_MBX_LINK_STAT_CHANGE:
 280                         link_status = msg_q[1];
 281                         memcpy(&speed, &msg_q[2], sizeof(speed));
 282                         duplex = (u8)msg_q[4];
 283 
 284                         /* update upper layer with new link link status */
 285                         hclgevf_update_link_status(hdev, link_status);
 286                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 287 
 288                         break;
 289                 case HCLGE_MBX_LINK_STAT_MODE:
 290                         idx = (u8)msg_q[1];
 291                         if (idx)
 292                                 memcpy(&hdev->hw.mac.supported, &msg_q[2],
 293                                        sizeof(unsigned long));
 294                         else
 295                                 memcpy(&hdev->hw.mac.advertising, &msg_q[2],
 296                                        sizeof(unsigned long));
 297                         break;
 298                 case HCLGE_MBX_ASSERTING_RESET:
 299                         /* PF has asserted reset hence VF should go in pending
 300                          * state and poll for the hardware reset status till it
 301                          * has been completely reset. After this stack should
 302                          * eventually be re-initialized.
 303                          */
 304                         reset_type = (enum hnae3_reset_type)msg_q[1];
 305                         set_bit(reset_type, &hdev->reset_pending);
 306                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 307                         hclgevf_reset_task_schedule(hdev);
 308 
 309                         break;
 310                 case HCLGE_MBX_PUSH_VLAN_INFO:
 311                         state = msg_q[1];
 312                         vlan_info = &msg_q[1];
 313                         hclgevf_update_port_base_vlan_info(hdev, state,
 314                                                            (u8 *)vlan_info, 8);
 315                         break;
 316                 default:
 317                         dev_err(&hdev->pdev->dev,
 318                                 "fetched unsupported(%d) message from arq\n",
 319                                 msg_q[0]);
 320                         break;
 321                 }
 322 
 323                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 324                 atomic_dec(&hdev->arq.count);
 325                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 326         }
 327 }