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 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev)
  17 {
  18         /* this function should be called with mbx_resp.mbx_mutex held
  19          * to prtect the received_response from race condition
  20          */
  21         hdev->mbx_resp.received_resp  = false;
  22         hdev->mbx_resp.origin_mbx_msg = 0;
  23         hdev->mbx_resp.resp_status    = 0;
  24         memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE);
  25 }
  26
  27 /* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox
  28  * message to PF.
  29  * @hdev: pointer to struct hclgevf_dev
  30  * @resp_msg: pointer to store the original message type and response status
  31  * @len: the resp_msg data array length.
  32  */
  33 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
  34                                 u8 *resp_data, u16 resp_len)
  35 {
  36 #define HCLGEVF_MAX_TRY_TIMES   500
  37 #define HCLGEVF_SLEEP_USECOND   1000
  38         struct hclgevf_mbx_resp_status *mbx_resp;
  39         u16 r_code0, r_code1;
  40         int i = 0;
  41
  42         if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) {
  43                 dev_err(&hdev->pdev->dev,
  44                         "VF mbx response len(=%u) exceeds maximum(=%u)\n",
  45                         resp_len,
  46                         HCLGE_MBX_MAX_RESP_DATA_SIZE);
  47                 return -EINVAL;
  48         }
  49
  50         while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) {
  51                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state))
  52                         return -EIO;
  53
  54                 usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
  55                 i++;
  56         }
  57
  58         if (i >= HCLGEVF_MAX_TRY_TIMES) {
  59                 dev_err(&hdev->pdev->dev,
  60                         "VF could not get mbx(%u,%u) resp(=%d) from PF in %d tries\n",
  61                         code0, code1, hdev->mbx_resp.received_resp, i);
  62                 return -EIO;
  63         }
  64
  65         mbx_resp = &hdev->mbx_resp;
  66         r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16);
  67         r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff);
  68
  69         if (mbx_resp->resp_status)
  70                 return mbx_resp->resp_status;
  71
  72         if (resp_data)
  73                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
  74
  75         hclgevf_reset_mbx_resp_status(hdev);
  76
  77         if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
  78                 dev_err(&hdev->pdev->dev,
  79                         "VF could not match resp code(code0=%u,code1=%u), %d\n",
  80                         code0, code1, mbx_resp->resp_status);
  81                 dev_err(&hdev->pdev->dev,
  82                         "VF could not match resp r_code(r_code0=%u,r_code1=%u)\n",
  83                         r_code0, r_code1);
  84                 return -EIO;
  85         }
  86
  87         return 0;
  88 }
  89
  90 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev,
  91                          struct hclge_vf_to_pf_msg *send_msg, bool need_resp,
  92                          u8 *resp_data, u16 resp_len)
  93 {
  94         struct hclge_mbx_vf_to_pf_cmd *req;
  95         struct hclgevf_desc desc;
  96         int status;
  97
  98         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
  99
 100         if (!send_msg) {
 101                 dev_err(&hdev->pdev->dev,
 102                         "failed to send mbx, msg is NULL\n");
 103                 return -EINVAL;
 104         }
 105
 106         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
 107         if (need_resp)
 108                 hnae3_set_bit(req->mbx_need_resp, HCLGE_MBX_NEED_RESP_B, 1);
 109
 110         memcpy(&req->msg, send_msg, sizeof(struct hclge_vf_to_pf_msg));
 111
 112         trace_hclge_vf_mbx_send(hdev, req);
 113
 114         /* synchronous send */
 115         if (need_resp) {
 116                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
 117                 hclgevf_reset_mbx_resp_status(hdev);
 118                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 119                 if (status) {
 120                         dev_err(&hdev->pdev->dev,
 121                                 "VF failed(=%d) to send mbx message to PF\n",
 122                                 status);
 123                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 124                         return status;
 125                 }
 126
 127                 status = hclgevf_get_mbx_resp(hdev, send_msg->code,
 128                                               send_msg->subcode, resp_data,
 129                                               resp_len);
 130                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 131         } else {
 132                 /* asynchronous send */
 133                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 134                 if (status) {
 135                         dev_err(&hdev->pdev->dev,
 136                                 "VF failed(=%d) to send mbx message to PF\n",
 137                                 status);
 138                         return status;
 139                 }
 140         }
 141
 142         return status;
 143 }
 144
 145 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw)
 146 {
 147         u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG);
 148
 149         return tail == hw->cmq.crq.next_to_use;
 150 }
 151
 152 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 153 {
 154         struct hclgevf_mbx_resp_status *resp;
 155         struct hclge_mbx_pf_to_vf_cmd *req;
 156         struct hclgevf_cmq_ring *crq;
 157         struct hclgevf_desc *desc;
 158         u16 *msg_q;
 159         u16 flag;
 160         u8 *temp;
 161         int i;
 162
 163         resp = &hdev->mbx_resp;
 164         crq = &hdev->hw.cmq.crq;
 165
 166         while (!hclgevf_cmd_crq_empty(&hdev->hw)) {
 167                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 168                         dev_info(&hdev->pdev->dev, "vf crq need init\n");
 169                         return;
 170                 }
 171
 172                 desc = &crq->desc[crq->next_to_use];
 173                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 174
 175                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 176                 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) {
 177                         dev_warn(&hdev->pdev->dev,
 178                                  "dropped invalid mailbox message, code = %u\n",
 179                                  req->msg.code);
 180
 181                         /* dropping/not processing this invalid message */
 182                         crq->desc[crq->next_to_use].flag = 0;
 183                         hclge_mbx_ring_ptr_move_crq(crq);
 184                         continue;
 185                 }
 186
 187                 trace_hclge_vf_mbx_get(hdev, req);
 188
 189                 /* synchronous messages are time critical and need preferential
 190                  * treatment. Therefore, we need to acknowledge all the sync
 191                  * responses as quickly as possible so that waiting tasks do not
 192                  * timeout and simultaneously queue the async messages for later
 193                  * prcessing in context of mailbox task i.e. the slow path.
 194                  */
 195                 switch (req->msg.code) {
 196                 case HCLGE_MBX_PF_VF_RESP:
 197                         if (resp->received_resp)
 198                                 dev_warn(&hdev->pdev->dev,
 199                                          "VF mbx resp flag not clear(%u)\n",
 200                                          req->msg.vf_mbx_msg_code);
 201                         resp->received_resp = true;
 202
 203                         resp->origin_mbx_msg =
 204                                         (req->msg.vf_mbx_msg_code << 16);
 205                         resp->origin_mbx_msg |= req->msg.vf_mbx_msg_subcode;
 206                         resp->resp_status =
 207                                 hclgevf_resp_to_errno(req->msg.resp_status);
 208
 209                         temp = (u8 *)req->msg.resp_data;
 210                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 211                                 resp->additional_info[i] = *temp;
 212                                 temp++;
 213                         }
 214                         break;
 215                 case HCLGE_MBX_LINK_STAT_CHANGE:
 216                 case HCLGE_MBX_ASSERTING_RESET:
 217                 case HCLGE_MBX_LINK_STAT_MODE:
 218                 case HCLGE_MBX_PUSH_VLAN_INFO:
 219                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 220                         /* set this mbx event as pending. This is required as we
 221                          * might loose interrupt event when mbx task is busy
 222                          * handling. This shall be cleared when mbx task just
 223                          * enters handling state.
 224                          */
 225                         hdev->mbx_event_pending = true;
 226
 227                         /* we will drop the async msg if we find ARQ as full
 228                          * and continue with next message
 229                          */
 230                         if (atomic_read(&hdev->arq.count) >=
 231                             HCLGE_MBX_MAX_ARQ_MSG_NUM) {
 232                                 dev_warn(&hdev->pdev->dev,
 233                                          "Async Q full, dropping msg(%u)\n",
 234                                          req->msg.code);
 235                                 break;
 236                         }
 237
 238                         /* tail the async message in arq */
 239                         msg_q = hdev->arq.msg_q[hdev->arq.tail];
 240                         memcpy(&msg_q[0], &req->msg,
 241                                HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16));
 242                         hclge_mbx_tail_ptr_move_arq(hdev->arq);
 243                         atomic_inc(&hdev->arq.count);
 244
 245                         hclgevf_mbx_task_schedule(hdev);
 246
 247                         break;
 248                 default:
 249                         dev_err(&hdev->pdev->dev,
 250                                 "VF received unsupported(%u) mbx msg from PF\n",
 251                                 req->msg.code);
 252                         break;
 253                 }
 254                 crq->desc[crq->next_to_use].flag = 0;
 255                 hclge_mbx_ring_ptr_move_crq(crq);
 256         }
 257
 258         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 259         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 260                           crq->next_to_use);
 261 }
 262
 263 static void hclgevf_parse_promisc_info(struct hclgevf_dev *hdev,
 264                                        u16 promisc_info)
 265 {
 266         if (!promisc_info)
 267                 dev_info(&hdev->pdev->dev,
 268                          "Promisc mode is closed by host for being untrusted.\n");
 269 }
 270
 271 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev)
 272 {
 273         enum hnae3_reset_type reset_type;
 274         u16 link_status, state;
 275         u16 *msg_q, *vlan_info;
 276         u8 duplex;
 277         u32 speed;
 278         u32 tail;
 279         u8 idx;
 280
 281         /* we can safely clear it now as we are at start of the async message
 282          * processing
 283          */
 284         hdev->mbx_event_pending = false;
 285
 286         tail = hdev->arq.tail;
 287
 288         /* process all the async queue messages */
 289         while (tail != hdev->arq.head) {
 290                 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) {
 291                         dev_info(&hdev->pdev->dev,
 292                                  "vf crq need init in async\n");
 293                         return;
 294                 }
 295
 296                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 297
 298                 switch (msg_q[0]) {
 299                 case HCLGE_MBX_LINK_STAT_CHANGE:
 300                         link_status = msg_q[1];
 301                         memcpy(&speed, &msg_q[2], sizeof(speed));
 302                         duplex = (u8)msg_q[4];
 303
 304                         /* update upper layer with new link link status */
 305                         hclgevf_update_link_status(hdev, link_status);
 306                         hclgevf_update_speed_duplex(hdev, speed, duplex);
 307
 308                         break;
 309                 case HCLGE_MBX_LINK_STAT_MODE:
 310                         idx = (u8)msg_q[1];
 311                         if (idx)
 312                                 memcpy(&hdev->hw.mac.supported, &msg_q[2],
 313                                        sizeof(unsigned long));
 314                         else
 315                                 memcpy(&hdev->hw.mac.advertising, &msg_q[2],
 316                                        sizeof(unsigned long));
 317                         break;
 318                 case HCLGE_MBX_ASSERTING_RESET:
 319                         /* PF has asserted reset hence VF should go in pending
 320                          * state and poll for the hardware reset status till it
 321                          * has been completely reset. After this stack should
 322                          * eventually be re-initialized.
 323                          */
 324                         reset_type = (enum hnae3_reset_type)msg_q[1];
 325                         set_bit(reset_type, &hdev->reset_pending);
 326                         set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state);
 327                         hclgevf_reset_task_schedule(hdev);
 328
 329                         break;
 330                 case HCLGE_MBX_PUSH_VLAN_INFO:
 331                         state = msg_q[1];
 332                         vlan_info = &msg_q[1];
 333                         hclgevf_update_port_base_vlan_info(hdev, state,
 334                                                            (u8 *)vlan_info, 8);
 335                         break;
 336                 case HCLGE_MBX_PUSH_PROMISC_INFO:
 337                         hclgevf_parse_promisc_info(hdev, msg_q[1]);
 338                         break;
 339                 default:
 340                         dev_err(&hdev->pdev->dev,
 341                                 "fetched unsupported(%u) message from arq\n",
 342                                 msg_q[0]);
 343                         break;
 344                 }
 345
 346                 hclge_mbx_head_ptr_move_arq(hdev->arq);
 347                 atomic_dec(&hdev->arq.count);
 348                 msg_q = hdev->arq.msg_q[hdev->arq.head];
 349         }
 350 }