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 #include "hns3_intr.h"
  26 #include "hns3_rxtx.h"
  27
  28 #define HNS3_CMD_CODE_OFFSET            2
  29
  30 static const struct errno_respcode_map err_code_map[] = {
  31         {0, 0},
  32         {1, -EPERM},
  33         {2, -ENOENT},
  34         {5, -EIO},
  35         {11, -EAGAIN},
  36         {12, -ENOMEM},
  37         {16, -EBUSY},
  38         {22, -EINVAL},
  39         {28, -ENOSPC},
  40         {95, -EOPNOTSUPP},
  41 };
  42
  43 static int
  44 hns3_resp_to_errno(uint16_t resp_code)
  45 {
  46         uint32_t i, num;
  47
  48         num = sizeof(err_code_map) / sizeof(struct errno_respcode_map);
  49         for (i = 0; i < num; i++) {
  50                 if (err_code_map[i].resp_code == resp_code)
  51                         return err_code_map[i].err_no;
  52         }
  53
  54         return -EIO;
  55 }
  56
  57 static void
  58 hns3_poll_all_sync_msg(void)
  59 {
  60         struct rte_eth_dev *eth_dev;
  61         struct hns3_adapter *adapter;
  62         const char *name;
  63         uint16_t port_id;
  64
  65         RTE_ETH_FOREACH_DEV(port_id) {
  66                 eth_dev = &rte_eth_devices[port_id];
  67                 name = eth_dev->device->driver->name;
  68                 if (strcmp(name, "net_hns3") && strcmp(name, "net_hns3_vf"))
  69                         continue;
  70                 adapter = eth_dev->data->dev_private;
  71                 if (!adapter || adapter->hw.adapter_state == HNS3_NIC_CLOSED)
  72                         continue;
  73                 /* Synchronous msg, the mbx_resp.req_msg_data is non-zero */
  74                 if (adapter->hw.mbx_resp.req_msg_data)
  75                         hns3_dev_handle_mbx_msg(&adapter->hw);
  76         }
  77 }
  78
  79 static int
  80 hns3_get_mbx_resp(struct hns3_hw *hw, uint16_t code0, uint16_t code1,
  81                   uint8_t *resp_data, uint16_t resp_len)
  82 {
  83 #define HNS3_MAX_RETRY_MS       500
  84         struct hns3_adapter *hns = HNS3_DEV_HW_TO_ADAPTER(hw);
  85         struct hns3_mbx_resp_status *mbx_resp;
  86         bool in_irq = false;
  87         uint64_t now;
  88         uint64_t end;
  89
  90         if (resp_len > HNS3_MBX_MAX_RESP_DATA_SIZE) {
  91                 hns3_err(hw, "VF mbx response len(=%d) exceeds maximum(=%d)",
  92                          resp_len, HNS3_MBX_MAX_RESP_DATA_SIZE);
  93                 return -EINVAL;
  94         }
  95
  96         now = get_timeofday_ms();
  97         end = now + HNS3_MAX_RETRY_MS;
  98         while ((hw->mbx_resp.head != hw->mbx_resp.tail + hw->mbx_resp.lost) &&
  99                (now < end)) {
 100                 if (rte_atomic16_read(&hw->reset.disable_cmd)) {
 101                         hns3_err(hw, "Don't wait for mbx respone because of "
 102                                  "disable_cmd");
 103                         return -EBUSY;
 104                 }
 105
 106                 if (is_reset_pending(hns)) {
 107                         hw->mbx_resp.req_msg_data = 0;
 108                         hns3_err(hw, "Don't wait for mbx respone because of "
 109                                  "reset pending");
 110                         return -EIO;
 111                 }
 112
 113                 /*
 114                  * The mbox response is running on the interrupt thread.
 115                  * Sending mbox in the interrupt thread cannot wait for the
 116                  * response, so polling the mbox response on the irq thread.
 117                  */
 118                 if (pthread_equal(hw->irq_thread_id, pthread_self())) {
 119                         in_irq = true;
 120                         hns3_poll_all_sync_msg();
 121                 } else {
 122                         rte_delay_ms(HNS3_POLL_RESPONE_MS);
 123                 }
 124                 now = get_timeofday_ms();
 125         }
 126         hw->mbx_resp.req_msg_data = 0;
 127         if (now >= end) {
 128                 hw->mbx_resp.lost++;
 129                 hns3_err(hw,
 130                          "VF could not get mbx(%d,%d) head(%d) tail(%d) lost(%d) from PF in_irq:%d",
 131                          code0, code1, hw->mbx_resp.head, hw->mbx_resp.tail,
 132                          hw->mbx_resp.lost, in_irq);
 133                 return -ETIME;
 134         }
 135         rte_io_rmb();
 136         mbx_resp = &hw->mbx_resp;
 137
 138         if (mbx_resp->resp_status)
 139                 return mbx_resp->resp_status;
 140
 141         if (resp_data)
 142                 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len);
 143
 144         return 0;
 145 }
 146
 147 int
 148 hns3_send_mbx_msg(struct hns3_hw *hw, uint16_t code, uint16_t subcode,
 149                   const uint8_t *msg_data, uint8_t msg_len, bool need_resp,
 150                   uint8_t *resp_data, uint16_t resp_len)
 151 {
 152         struct hns3_mbx_vf_to_pf_cmd *req;
 153         struct hns3_cmd_desc desc;
 154         bool is_ring_vector_msg;
 155         int offset;
 156         int ret;
 157
 158         req = (struct hns3_mbx_vf_to_pf_cmd *)desc.data;
 159
 160         /* first two bytes are reserved for code & subcode */
 161         if (msg_len > (HNS3_MBX_MAX_MSG_SIZE - HNS3_CMD_CODE_OFFSET)) {
 162                 hns3_err(hw,
 163                          "VF send mbx msg fail, msg len %d exceeds max payload len %d",
 164                          msg_len, HNS3_MBX_MAX_MSG_SIZE - HNS3_CMD_CODE_OFFSET);
 165                 return -EINVAL;
 166         }
 167
 168         hns3_cmd_setup_basic_desc(&desc, HNS3_OPC_MBX_VF_TO_PF, false);
 169         req->msg[0] = code;
 170         is_ring_vector_msg = (code == HNS3_MBX_MAP_RING_TO_VECTOR) ||
 171                              (code == HNS3_MBX_UNMAP_RING_TO_VECTOR) ||
 172                              (code == HNS3_MBX_GET_RING_VECTOR_MAP);
 173         if (!is_ring_vector_msg)
 174                 req->msg[1] = subcode;
 175         if (msg_data) {
 176                 offset = is_ring_vector_msg ? 1 : HNS3_CMD_CODE_OFFSET;
 177                 memcpy(&req->msg[offset], msg_data, msg_len);
 178         }
 179
 180         /* synchronous send */
 181         if (need_resp) {
 182                 req->mbx_need_resp |= HNS3_MBX_NEED_RESP_BIT;
 183                 rte_spinlock_lock(&hw->mbx_resp.lock);
 184                 hw->mbx_resp.req_msg_data = (uint32_t)code << 16 | subcode;
 185                 hw->mbx_resp.head++;
 186                 ret = hns3_cmd_send(hw, &desc, 1);
 187                 if (ret) {
 188                         rte_spinlock_unlock(&hw->mbx_resp.lock);
 189                         hns3_err(hw, "VF failed(=%d) to send mbx message to PF",
 190                                  ret);
 191                         return ret;
 192                 }
 193
 194                 ret = hns3_get_mbx_resp(hw, code, subcode, resp_data, resp_len);
 195                 rte_spinlock_unlock(&hw->mbx_resp.lock);
 196         } else {
 197                 /* asynchronous send */
 198                 ret = hns3_cmd_send(hw, &desc, 1);
 199                 if (ret) {
 200                         hns3_err(hw, "VF failed(=%d) to send mbx message to PF",
 201                                  ret);
 202                         return ret;
 203                 }
 204         }
 205
 206         return ret;
 207 }
 208
 209 static bool
 210 hns3_cmd_crq_empty(struct hns3_hw *hw)
 211 {
 212         uint32_t tail = hns3_read_dev(hw, HNS3_CMDQ_RX_TAIL_REG);
 213
 214         return tail == hw->cmq.crq.next_to_use;
 215 }
 216
 217 static void
 218 hns3_mbx_handler(struct hns3_hw *hw)
 219 {
 220         struct hns3_mac *mac = &hw->mac;
 221         enum hns3_reset_level reset_level;
 222         uint16_t *msg_q;
 223         uint8_t opcode;
 224         uint32_t tail;
 225
 226         tail = hw->arq.tail;
 227
 228         /* process all the async queue messages */
 229         while (tail != hw->arq.head) {
 230                 msg_q = hw->arq.msg_q[hw->arq.head];
 231
 232                 opcode = msg_q[0] & 0xff;
 233                 switch (opcode) {
 234                 case HNS3_MBX_LINK_STAT_CHANGE:
 235                         memcpy(&mac->link_speed, &msg_q[2],
 236                                    sizeof(mac->link_speed));
 237                         mac->link_status = rte_le_to_cpu_16(msg_q[1]);
 238                         mac->link_duplex = (uint8_t)rte_le_to_cpu_16(msg_q[4]);
 239                         break;
 240                 case HNS3_MBX_ASSERTING_RESET:
 241                         /* PF has asserted reset hence VF should go in pending
 242                          * state and poll for the hardware reset status till it
 243                          * has been completely reset. After this stack should
 244                          * eventually be re-initialized.
 245                          */
 246                         reset_level = rte_le_to_cpu_16(msg_q[1]);
 247                         hns3_atomic_set_bit(reset_level, &hw->reset.pending);
 248
 249                         hns3_warn(hw, "PF inform reset level %d", reset_level);
 250                         hw->reset.stats.request_cnt++;
 251                         hns3_schedule_reset(HNS3_DEV_HW_TO_ADAPTER(hw));
 252                         break;
 253                 default:
 254                         hns3_err(hw, "Fetched unsupported(%d) message from arq",
 255                                  opcode);
 256                         break;
 257                 }
 258
 259                 hns3_mbx_head_ptr_move_arq(hw->arq);
 260                 msg_q = hw->arq.msg_q[hw->arq.head];
 261         }
 262 }
 263
 264 /*
 265  * Case1: receive response after timeout, req_msg_data
 266  *        is 0, not equal resp_msg, do lost--
 267  * Case2: receive last response during new send_mbx_msg,
 268  *        req_msg_data is different with resp_msg, let
 269  *        lost--, continue to wait for response.
 270  */
 271 static void
 272 hns3_update_resp_position(struct hns3_hw *hw, uint32_t resp_msg)
 273 {
 274         struct hns3_mbx_resp_status *resp = &hw->mbx_resp;
 275         uint32_t tail = resp->tail + 1;
 276
 277         if (tail > resp->head)
 278                 tail = resp->head;
 279         if (resp->req_msg_data != resp_msg) {
 280                 if (resp->lost)
 281                         resp->lost--;
 282                 hns3_warn(hw, "Received a mismatched response req_msg(%x) "
 283                           "resp_msg(%x) head(%d) tail(%d) lost(%d)",
 284                           resp->req_msg_data, resp_msg, resp->head, tail,
 285                           resp->lost);
 286         } else if (tail + resp->lost > resp->head) {
 287                 resp->lost--;
 288                 hns3_warn(hw, "Received a new response again resp_msg(%x) "
 289                           "head(%d) tail(%d) lost(%d)", resp_msg,
 290                           resp->head, tail, resp->lost);
 291         }
 292         rte_io_wmb();
 293         resp->tail = tail;
 294 }
 295
 296 static void
 297 hns3_link_fail_parse(struct hns3_hw *hw, uint8_t link_fail_code)
 298 {
 299         switch (link_fail_code) {
 300         case HNS3_MBX_LF_NORMAL:
 301                 break;
 302         case HNS3_MBX_LF_REF_CLOCK_LOST:
 303                 hns3_warn(hw, "Reference clock lost!");
 304                 break;
 305         case HNS3_MBX_LF_XSFP_TX_DISABLE:
 306                 hns3_warn(hw, "SFP tx is disabled!");
 307                 break;
 308         case HNS3_MBX_LF_XSFP_ABSENT:
 309                 hns3_warn(hw, "SFP is absent!");
 310                 break;
 311         default:
 312                 hns3_warn(hw, "Unknown fail code:%u!", link_fail_code);
 313                 break;
 314         }
 315 }
 316
 317 static void
 318 hns3_handle_link_change_event(struct hns3_hw *hw,
 319                               struct hns3_mbx_pf_to_vf_cmd *req)
 320 {
 321 #define LINK_STATUS_OFFSET     1
 322 #define LINK_FAIL_CODE_OFFSET  2
 323
 324         if (!req->msg[LINK_STATUS_OFFSET])
 325                 hns3_link_fail_parse(hw, req->msg[LINK_FAIL_CODE_OFFSET]);
 326
 327         hns3_update_link_status(hw);
 328 }
 329
 330 static void
 331 hns3_update_port_base_vlan_info(struct hns3_hw *hw,
 332                                 struct hns3_mbx_pf_to_vf_cmd *req)
 333 {
 334 #define PVID_STATE_OFFSET       1
 335         uint16_t new_pvid_state = req->msg[PVID_STATE_OFFSET] ?
 336                 HNS3_PORT_BASE_VLAN_ENABLE : HNS3_PORT_BASE_VLAN_DISABLE;
 337         /*
 338          * Currently, hardware doesn't support more than two layers VLAN offload
 339          * based on hns3 network engine, which would cause packets loss or wrong
 340          * packets for these types of packets. If the hns3 PF kernel ethdev
 341          * driver sets the PVID for VF device after initialization of the
 342          * related VF device, the PF driver will notify VF driver to update the
 343          * PVID configuration state. The VF driver will update the PVID
 344          * configuration state immediately to ensure that the VLAN process in Tx
 345          * and Rx is correct. But in the window period of this state transition,
 346          * packets loss or packets with wrong VLAN may occur.
 347          */
 348         if (hw->port_base_vlan_cfg.state != new_pvid_state) {
 349                 hw->port_base_vlan_cfg.state = new_pvid_state;
 350                 hns3_update_all_queues_pvid_proc_en(hw);
 351         }
 352 }
 353
 354 static void
 355 hns3_handle_promisc_info(struct hns3_hw *hw, uint16_t promisc_en)
 356 {
 357         if (!promisc_en) {
 358                 /*
 359                  * When promisc/allmulti mode is closed by the hns3 PF kernel
 360                  * ethdev driver for untrusted, modify VF's related status.
 361                  */
 362                 hns3_warn(hw, "Promisc mode will be closed by host for being "
 363                               "untrusted.");
 364                 hw->data->promiscuous = 0;
 365                 hw->data->all_multicast = 0;
 366         }
 367 }
 368
 369 void
 370 hns3_dev_handle_mbx_msg(struct hns3_hw *hw)
 371 {
 372         struct hns3_mbx_resp_status *resp = &hw->mbx_resp;
 373         struct hns3_cmq_ring *crq = &hw->cmq.crq;
 374         struct hns3_mbx_pf_to_vf_cmd *req;
 375         struct hns3_cmd_desc *desc;
 376         uint32_t msg_data;
 377         uint16_t *msg_q;
 378         uint8_t opcode;
 379         uint16_t flag;
 380         uint8_t *temp;
 381         int i;
 382
 383         while (!hns3_cmd_crq_empty(hw)) {
 384                 if (rte_atomic16_read(&hw->reset.disable_cmd))
 385                         return;
 386
 387                 desc = &crq->desc[crq->next_to_use];
 388                 req = (struct hns3_mbx_pf_to_vf_cmd *)desc->data;
 389                 opcode = req->msg[0] & 0xff;
 390
 391                 flag = rte_le_to_cpu_16(crq->desc[crq->next_to_use].flag);
 392                 if (unlikely(!hns3_get_bit(flag, HNS3_CMDQ_RX_OUTVLD_B))) {
 393                         hns3_warn(hw,
 394                                   "dropped invalid mailbox message, code = %d",
 395                                   opcode);
 396
 397                         /* dropping/not processing this invalid message */
 398                         crq->desc[crq->next_to_use].flag = 0;
 399                         hns3_mbx_ring_ptr_move_crq(crq);
 400                         continue;
 401                 }
 402
 403                 switch (opcode) {
 404                 case HNS3_MBX_PF_VF_RESP:
 405                         resp->resp_status = hns3_resp_to_errno(req->msg[3]);
 406
 407                         temp = (uint8_t *)&req->msg[4];
 408                         for (i = 0; i < HNS3_MBX_MAX_RESP_DATA_SIZE; i++) {
 409                                 resp->additional_info[i] = *temp;
 410                                 temp++;
 411                         }
 412                         msg_data = (uint32_t)req->msg[1] << 16 | req->msg[2];
 413                         hns3_update_resp_position(hw, msg_data);
 414                         break;
 415                 case HNS3_MBX_LINK_STAT_CHANGE:
 416                 case HNS3_MBX_ASSERTING_RESET:
 417                         msg_q = hw->arq.msg_q[hw->arq.tail];
 418                         memcpy(&msg_q[0], req->msg,
 419                                HNS3_MBX_MAX_ARQ_MSG_SIZE * sizeof(uint16_t));
 420                         hns3_mbx_tail_ptr_move_arq(hw->arq);
 421
 422                         hns3_mbx_handler(hw);
 423                         break;
 424                 case HNS3_MBX_PUSH_LINK_STATUS:
 425                         hns3_handle_link_change_event(hw, req);
 426                         break;
 427                 case HNS3_MBX_PUSH_VLAN_INFO:
 428                         /*
 429                          * When the PVID configuration status of VF device is
 430                          * changed by the hns3 PF kernel driver, VF driver will
 431                          * receive this mailbox message from PF driver.
 432                          */
 433                         hns3_update_port_base_vlan_info(hw, req);
 434                         break;
 435                 case HNS3_MBX_PUSH_PROMISC_INFO:
 436                         /*
 437                          * When the trust status of VF device changed by the
 438                          * hns3 PF kernel driver, VF driver will receive this
 439                          * mailbox message from PF driver.
 440                          */
 441                         hns3_handle_promisc_info(hw, req->msg[1]);
 442                         break;
 443                 default:
 444                         hns3_err(hw,
 445                                  "VF received unsupported(%d) mbx msg from PF",
 446                                  req->msg[0]);
 447                         break;
 448                 }
 449
 450                 crq->desc[crq->next_to_use].flag = 0;
 451                 hns3_mbx_ring_ptr_move_crq(crq);
 452         }
 453
 454         /* Write back CMDQ_RQ header pointer, IMP need this pointer */
 455         hns3_write_dev(hw, HNS3_CMDQ_RX_HEAD_REG, crq->next_to_use);
 456 }