drivers/net/hns3/hns3_mbx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2018-2019 Hisilicon Limited.
   3  */
   4
   5 #include <errno.h>
   6 #include <stdbool.h>
   7 #include <stdint.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <inttypes.h>
  11 #include <unistd.h>
  12 #include <rte_byteorder.h>
  13 #include <rte_common.h>
  14 #include <rte_cycles.h>
  15 #include <rte_dev.h>
  16 #include <rte_ethdev_driver.h>
  17 #include <rte_io.h>
  18 #include <rte_spinlock.h>
  19 #include <rte_pci.h>
  20 #include <rte_bus_pci.h>
  21
  22 #include "hns3_ethdev.h"
  23 #include "hns3_regs.h"
  24 #include "hns3_logs.h"
  25
  26 #define HNS3_REG_MSG_DATA_OFFSET        4
  27 #define HNS3_CMD_CODE_OFFSET            2
  28
  29 static const struct errno_respcode_map err_code_map[] = {
  30         {0, 0},
  31         {1, -EPERM},
  32         {2, -ENOENT},
  33         {5, -EIO},
  34         {11, -EAGAIN},
  35         {12, -ENOMEM},
  36         {16, -EBUSY},
  37         {22, -EINVAL},
  38         {28, -ENOSPC},
  39         {95, -EOPNOTSUPP},
  40 };
  41
  42 static int
  43 hns3_resp_to_errno(uint16_t resp_code)
  44 {
  45         uint32_t i, num;
  46
  47         num = sizeof(err_code_map) / sizeof(struct errno_respcode_map);
  48         for (i = 0; i < num; i++) {
  49                 if (err_code_map[i].resp_code == resp_code)
  50                         return err_code_map[i].err_no;
  51         }
  52
  53         return -EIO;
  54 }
  55
  56 static void
  57 hns3_poll_all_sync_msg(void)
  58 {
  59         struct rte_eth_dev *eth_dev;
  60         struct hns3_adapter *adapter;
  61         const char *name;
  62         uint16_t port_id;
  63
  64         RTE_ETH_FOREACH_DEV(port_id) {
  65                 eth_dev = &rte_eth_devices[port_id];
  66                 name = eth_dev->device->driver->name;
  67                 if (strcmp(name, "net_hns3") && strcmp(name, "net_hns3_vf"))
  68                         continue;
  69                 adapter = eth_dev->data->dev_private;
  70                 if (!adapter || adapter->hw.adapter_state == HNS3_NIC_CLOSED)
  71                         continue;
  72                 /* Synchronous msg, the mbx_resp.req_msg_data is non-zero */
  73                 if (adapter->hw.mbx_resp.req_msg_data)
  74                         hns3_dev_handle_mbx_msg(&adapter->hw);
  75         }
  76 }
  77
  78 static int
  79 hns3_get_mbx_resp(struct hns3_hw *hw, uint16_t code0, uint16_t code1,
  80                   uint8_t *resp_data, uint16_t resp_len)
  81 {
  82 #define HNS3_MAX_RETRY_MS       500
  83         struct hns3_mbx_resp_status *mbx_resp;
  84         bool in_irq = false;
  85         uint64_t now;
  86         uint64_t end;
  87
  88         if (resp_len > HNS3_MBX_MAX_RESP_DATA_SIZE) {
  89                 hns3_err(hw, "VF mbx response len(=%d) exceeds maximum(=%d)",
  90                          resp_len, HNS3_MBX_MAX_RESP_DATA_SIZE);
  91                 return -EINVAL;
  92         }
  93
  94         now = get_timeofday_ms();
  95         end = now + HNS3_MAX_RETRY_MS;
  96         while ((hw->mbx_resp.head != hw->mbx_resp.tail + hw->mbx_resp.lost) &&
  97                (now < end)) {
  98                 /*
  99                  * The mbox response is running on the interrupt thread.
 100                  * Sending mbox in the interrupt thread cannot wait for the
 101                  * response, so polling the mbox response on the irq thread.
 102                  */
 103                 if (pthread_equal(hw->irq_thread_id, pthread_self())) {
 104                         in_irq = true;
 105                         hns3_poll_all_sync_msg();
 106                 } else {
 107                         rte_delay_ms(HNS3_POLL_RESPONE_MS);
 108                 }
 109                 now = get_timeofday_ms();
 110         }
 111         hw->mbx_resp.req_msg_data = 0;
 112         if (now >= end) {
 113                 hw->mbx_resp.lost++;
 114                 hns3_err(hw,
 115                          "VF could not get mbx(%d,%d) head(%d) tail(%d) lost(%d) from PF in_irq:%d",
 116                          code0, code1, hw->mbx_resp.head, hw->mbx_resp.tail,
 117                          hw->mbx_resp.lost, in_irq);
 118                 return -ETIME;
 119         }
 120         rte_io_rmb();
 121         mbx_resp = &hw->mbx_resp;
 122
 123         if (mbx_resp->resp_status)
 124                 return mbx_resp->resp_status;
 125
 126         if (resp_data)
 127                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
 128
 129         return 0;
 130 }
 131
 132 int
 133 hns3_send_mbx_msg(struct hns3_hw *hw, uint16_t code, uint16_t subcode,
 134                   const uint8_t *msg_data, uint8_t msg_len, bool need_resp,
 135                   uint8_t *resp_data, uint16_t resp_len)
 136 {
 137         struct hns3_mbx_vf_to_pf_cmd *req;
 138         struct hns3_cmd_desc desc;
 139         int ret;
 140
 141         req = (struct hns3_mbx_vf_to_pf_cmd *)desc.data;
 142
 143         /* first two bytes are reserved for code & subcode */
 144         if (msg_len > (HNS3_MBX_MAX_MSG_SIZE - HNS3_CMD_CODE_OFFSET)) {
 145                 hns3_err(hw,
 146                          "VF send mbx msg fail, msg len %d exceeds max payload len %d",
 147                          msg_len, HNS3_MBX_MAX_MSG_SIZE - HNS3_CMD_CODE_OFFSET);
 148                 return -EINVAL;
 149         }
 150
 151         hns3_cmd_setup_basic_desc(&desc, HNS3_OPC_MBX_VF_TO_PF, false);
 152         req->msg[0] = code;
 153         req->msg[1] = subcode;
 154         if (msg_data)
 155                 memcpy(&req->msg[HNS3_CMD_CODE_OFFSET], msg_data, msg_len);
 156
 157         /* synchronous send */
 158         if (need_resp) {
 159                 req->mbx_need_resp |= HNS3_MBX_NEED_RESP_BIT;
 160                 rte_spinlock_lock(&hw->mbx_resp.lock);
 161                 hw->mbx_resp.req_msg_data = (uint32_t)code << 16 | subcode;
 162                 hw->mbx_resp.head++;
 163                 ret = hns3_cmd_send(hw, &desc, 1);
 164                 if (ret) {
 165                         rte_spinlock_unlock(&hw->mbx_resp.lock);
 166                         hns3_err(hw, "VF failed(=%d) to send mbx message to PF",
 167                                  ret);
 168                         return ret;
 169                 }
 170
 171                 ret = hns3_get_mbx_resp(hw, code, subcode, resp_data, resp_len);
 172                 rte_spinlock_unlock(&hw->mbx_resp.lock);
 173         } else {
 174                 /* asynchronous send */
 175                 ret = hns3_cmd_send(hw, &desc, 1);
 176                 if (ret) {
 177                         hns3_err(hw, "VF failed(=%d) to send mbx message to PF",
 178                                  ret);
 179                         return ret;
 180                 }
 181         }
 182
 183         return ret;
 184 }
 185
 186 static bool
 187 hns3_cmd_crq_empty(struct hns3_hw *hw)
 188 {
 189         uint32_t tail = hns3_read_dev(hw, HNS3_CMDQ_RX_TAIL_REG);
 190
 191         return tail == hw->cmq.crq.next_to_use;
 192 }
 193
 194 static void
 195 hns3_mbx_handler(struct hns3_hw *hw)
 196 {
 197         struct hns3_mac *mac = &hw->mac;
 198         enum hns3_reset_level reset_level;
 199         uint16_t *msg_q;
 200         uint32_t tail;
 201
 202         tail = hw->arq.tail;
 203
 204         /* process all the async queue messages */
 205         while (tail != hw->arq.head) {
 206                 msg_q = hw->arq.msg_q[hw->arq.head];
 207
 208                 switch (msg_q[0]) {
 209                 case HNS3_MBX_LINK_STAT_CHANGE:
 210                         memcpy(&mac->link_speed, &msg_q[2],
 211                                    sizeof(mac->link_speed));
 212                         mac->link_status = rte_le_to_cpu_16(msg_q[1]);
 213                         mac->link_duplex = (uint8_t)rte_le_to_cpu_16(msg_q[4]);
 214                         break;
 215                 case HNS3_MBX_ASSERTING_RESET:
 216                         /* PF has asserted reset hence VF should go in pending
 217                          * state and poll for the hardware reset status till it
 218                          * has been completely reset. After this stack should
 219                          * eventually be re-initialized.
 220                          */
 221                         reset_level = rte_le_to_cpu_16(msg_q[1]);
 222                         hns3_atomic_set_bit(reset_level, &hw->reset.pending);
 223
 224                         hns3_warn(hw, "PF inform reset level %d", reset_level);
 225                         hw->reset.stats.request_cnt++;
 226                         break;
 227                 default:
 228                         hns3_err(hw, "Fetched unsupported(%d) message from arq",
 229                                  msg_q[0]);
 230                         break;
 231                 }
 232
 233                 hns3_mbx_head_ptr_move_arq(hw->arq);
 234                 msg_q = hw->arq.msg_q[hw->arq.head];
 235         }
 236 }
 237
 238 /*
 239  * Case1: receive response after timeout, req_msg_data
 240  *        is 0, not equal resp_msg, do lost--
 241  * Case2: receive last response during new send_mbx_msg,
 242  *        req_msg_data is different with resp_msg, let
 243  *        lost--, continue to wait for response.
 244  */
 245 static void
 246 hns3_update_resp_position(struct hns3_hw *hw, uint32_t resp_msg)
 247 {
 248         struct hns3_mbx_resp_status *resp = &hw->mbx_resp;
 249         uint32_t tail = resp->tail + 1;
 250
 251         if (tail > resp->head)
 252                 tail = resp->head;
 253         if (resp->req_msg_data != resp_msg) {
 254                 if (resp->lost)
 255                         resp->lost--;
 256                 hns3_warn(hw, "Received a mismatched response req_msg(%x) "
 257                           "resp_msg(%x) head(%d) tail(%d) lost(%d)",
 258                           resp->req_msg_data, resp_msg, resp->head, tail,
 259                           resp->lost);
 260         } else if (tail + resp->lost > resp->head) {
 261                 resp->lost--;
 262                 hns3_warn(hw, "Received a new response again resp_msg(%x) "
 263                           "head(%d) tail(%d) lost(%d)", resp_msg,
 264                           resp->head, tail, resp->lost);
 265         }
 266         rte_io_wmb();
 267         resp->tail = tail;
 268 }
 269
 270 void
 271 hns3_dev_handle_mbx_msg(struct hns3_hw *hw)
 272 {
 273         struct hns3_mbx_resp_status *resp = &hw->mbx_resp;
 274         struct hns3_cmq_ring *crq = &hw->cmq.crq;
 275         struct hns3_mbx_pf_to_vf_cmd *req;
 276         struct hns3_cmd_desc *desc;
 277         uint32_t msg_data;
 278         uint16_t *msg_q;
 279         uint16_t flag;
 280         uint8_t *temp;
 281         int i;
 282
 283         while (!hns3_cmd_crq_empty(hw)) {
 284                 if (rte_atomic16_read(&hw->reset.disable_cmd))
 285                         return;
 286
 287                 desc = &crq->desc[crq->next_to_use];
 288                 req = (struct hns3_mbx_pf_to_vf_cmd *)desc->data;
 289
 290                 flag = rte_le_to_cpu_16(crq->desc[crq->next_to_use].flag);
 291                 if (unlikely(!hns3_get_bit(flag, HNS3_CMDQ_RX_OUTVLD_B))) {
 292                         hns3_warn(hw,
 293                                   "dropped invalid mailbox message, code = %d",
 294                                   req->msg[0]);
 295
 296                         /* dropping/not processing this invalid message */
 297                         crq->desc[crq->next_to_use].flag = 0;
 298                         hns3_mbx_ring_ptr_move_crq(crq);
 299                         continue;
 300                 }
 301
 302                 switch (req->msg[0]) {
 303                 case HNS3_MBX_PF_VF_RESP:
 304                         resp->resp_status = hns3_resp_to_errno(req->msg[3]);
 305
 306                         temp = (uint8_t *)&req->msg[4];
 307                         for (i = 0; i < HNS3_MBX_MAX_RESP_DATA_SIZE &&
 308                              i < HNS3_REG_MSG_DATA_OFFSET; i++) {
 309                                 resp->additional_info[i] = *temp;
 310                                 temp++;
 311                         }
 312                         msg_data = (uint32_t)req->msg[1] << 16 | req->msg[2];
 313                         hns3_update_resp_position(hw, msg_data);
 314                         break;
 315                 case HNS3_MBX_LINK_STAT_CHANGE:
 316                 case HNS3_MBX_ASSERTING_RESET:
 317                         msg_q = hw->arq.msg_q[hw->arq.tail];
 318                         memcpy(&msg_q[0], req->msg,
 319                                HNS3_MBX_MAX_ARQ_MSG_SIZE * sizeof(uint16_t));
 320                         hns3_mbx_tail_ptr_move_arq(hw->arq);
 321
 322                         hns3_mbx_handler(hw);
 323                         break;
 324                 default:
 325                         hns3_err(hw,
 326                                  "VF received unsupported(%d) mbx msg from PF",
 327                                  req->msg[0]);
 328                         break;
 329                 }
 330
 331                 crq->desc[crq->next_to_use].flag = 0;
 332                 hns3_mbx_ring_ptr_move_crq(crq);
 333         }
 334
 335         /* Write back CMDQ_RQ header pointer, IMP need this pointer */
 336         hns3_write_dev(hw, HNS3_CMDQ_RX_HEAD_REG, crq->next_to_use);
 337 }