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         if (resp_data)
  58                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
  59
  60         hclgevf_reset_mbx_resp_status(hdev);
  61
  62         if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) {
  63                 dev_err(&hdev->pdev->dev,
  64                         "VF could not match resp code(code0=%d,code1=%d), %d",
  65                         code0, code1, mbx_resp->resp_status);
  66                 return -EIO;
  67         }
  68
  69         return 0;
  70 }
  71
  72 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode,
  73                          const u8 *msg_data, u8 msg_len, bool need_resp,
  74                          u8 *resp_data, u16 resp_len)
  75 {
  76         struct hclge_mbx_vf_to_pf_cmd *req;
  77         struct hclgevf_desc desc;
  78         int status;
  79
  80         req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data;
  81
  82         /* first two bytes are reserved for code & subcode */
  83         if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) {
  84                 dev_err(&hdev->pdev->dev,
  85                         "VF send mbx msg fail, msg len %d exceeds max len %d\n",
  86                         msg_len, HCLGE_MBX_MAX_MSG_SIZE);
  87                 return -EINVAL;
  88         }
  89
  90         hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false);
  91         req->msg[0] = code;
  92         req->msg[1] = subcode;
  93         memcpy(&req->msg[2], msg_data, msg_len);
  94
  95         /* synchronous send */
  96         if (need_resp) {
  97                 mutex_lock(&hdev->mbx_resp.mbx_mutex);
  98                 hclgevf_reset_mbx_resp_status(hdev);
  99                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 100                 if (status) {
 101                         dev_err(&hdev->pdev->dev,
 102                                 "VF failed(=%d) to send mbx message to PF\n",
 103                                 status);
 104                         mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 105                         return status;
 106                 }
 107
 108                 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data,
 109                                               resp_len);
 110                 mutex_unlock(&hdev->mbx_resp.mbx_mutex);
 111         } else {
 112                 /* asynchronous send */
 113                 status = hclgevf_cmd_send(&hdev->hw, &desc, 1);
 114                 if (status) {
 115                         dev_err(&hdev->pdev->dev,
 116                                 "VF failed(=%d) to send mbx message to PF\n",
 117                                 status);
 118                         return status;
 119                 }
 120         }
 121
 122         return status;
 123 }
 124
 125 void hclgevf_mbx_handler(struct hclgevf_dev *hdev)
 126 {
 127         struct hclgevf_mbx_resp_status *resp;
 128         struct hclge_mbx_pf_to_vf_cmd *req;
 129         struct hclgevf_cmq_ring *crq;
 130         struct hclgevf_desc *desc;
 131         u16 link_status, flag;
 132         u8 *temp;
 133         int i;
 134
 135         resp = &hdev->mbx_resp;
 136         crq = &hdev->hw.cmq.crq;
 137
 138         flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 139         while (hnae_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B)) {
 140                 desc = &crq->desc[crq->next_to_use];
 141                 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data;
 142
 143                 switch (req->msg[0]) {
 144                 case HCLGE_MBX_PF_VF_RESP:
 145                         if (resp->received_resp)
 146                                 dev_warn(&hdev->pdev->dev,
 147                                          "VF mbx resp flag not clear(%d)\n",
 148                                          req->msg[1]);
 149                         resp->received_resp = true;
 150
 151                         resp->origin_mbx_msg = (req->msg[1] << 16);
 152                         resp->origin_mbx_msg |= req->msg[2];
 153                         resp->resp_status = req->msg[3];
 154
 155                         temp = (u8 *)&req->msg[4];
 156                         for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) {
 157                                 resp->additional_info[i] = *temp;
 158                                 temp++;
 159                         }
 160                         break;
 161                 case HCLGE_MBX_LINK_STAT_CHANGE:
 162                         link_status = le16_to_cpu(req->msg[1]);
 163
 164                         /* update upper layer with new link link status */
 165                         hclgevf_update_link_status(hdev, link_status);
 166
 167                         break;
 168                 default:
 169                         dev_err(&hdev->pdev->dev,
 170                                 "VF received unsupported(%d) mbx msg from PF\n",
 171                                 req->msg[0]);
 172                         break;
 173                 }
 174                 hclge_mbx_ring_ptr_move_crq(crq);
 175                 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag);
 176         }
 177
 178         /* Write back CMDQ_RQ header pointer, M7 need this pointer */
 179         hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG,
 180                           crq->next_to_use);
 181 }