ceph/src/spdk/dpdk/drivers/net/sfc/sfc_ev.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright (c) 2016-2018 Solarflare Communications Inc.
   4  * All rights reserved.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 #include <rte_debug.h>
  11 #include <rte_cycles.h>
  12 #include <rte_alarm.h>
  13 #include <rte_branch_prediction.h>
  14
  15 #include "efx.h"
  16
  17 #include "sfc.h"
  18 #include "sfc_debug.h"
  19 #include "sfc_log.h"
  20 #include "sfc_ev.h"
  21 #include "sfc_rx.h"
  22 #include "sfc_tx.h"
  23 #include "sfc_kvargs.h"
  24
  25
  26 /* Initial delay when waiting for event queue init complete event */
  27 #define SFC_EVQ_INIT_BACKOFF_START_US   (1)
  28 /* Maximum delay between event queue polling attempts */
  29 #define SFC_EVQ_INIT_BACKOFF_MAX_US     (10 * 1000)
  30 /* Event queue init approx timeout */
  31 #define SFC_EVQ_INIT_TIMEOUT_US         (2 * US_PER_S)
  32
  33 /* Management event queue polling period in microseconds */
  34 #define SFC_MGMT_EV_QPOLL_PERIOD_US     (US_PER_S)
  35
  36 static const char *
  37 sfc_evq_type2str(enum sfc_evq_type type)
  38 {
  39         switch (type) {
  40         case SFC_EVQ_TYPE_MGMT:
  41                 return "mgmt-evq";
  42         case SFC_EVQ_TYPE_RX:
  43                 return "rx-evq";
  44         case SFC_EVQ_TYPE_TX:
  45                 return "tx-evq";
  46         default:
  47                 SFC_ASSERT(B_FALSE);
  48                 return NULL;
  49         }
  50 }
  51
  52 static boolean_t
  53 sfc_ev_initialized(void *arg)
  54 {
  55         struct sfc_evq *evq = arg;
  56
  57         /* Init done events may be duplicated on SFN7xxx (SFC bug 31631) */
  58         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTING ||
  59                    evq->init_state == SFC_EVQ_STARTED);
  60
  61         evq->init_state = SFC_EVQ_STARTED;
  62
  63         return B_FALSE;
  64 }
  65
  66 static boolean_t
  67 sfc_ev_nop_rx(void *arg, uint32_t label, uint32_t id,
  68               uint32_t size, uint16_t flags)
  69 {
  70         struct sfc_evq *evq = arg;
  71
  72         sfc_err(evq->sa,
  73                 "EVQ %u unexpected Rx event label=%u id=%#x size=%u flags=%#x",
  74                 evq->evq_index, label, id, size, flags);
  75         return B_TRUE;
  76 }
  77
  78 static boolean_t
  79 sfc_ev_efx_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
  80               uint32_t size, uint16_t flags)
  81 {
  82         struct sfc_evq *evq = arg;
  83         struct sfc_efx_rxq *rxq;
  84         unsigned int stop;
  85         unsigned int pending_id;
  86         unsigned int delta;
  87         unsigned int i;
  88         struct sfc_efx_rx_sw_desc *rxd;
  89
  90         if (unlikely(evq->exception))
  91                 goto done;
  92
  93         rxq = sfc_efx_rxq_by_dp_rxq(evq->dp_rxq);
  94
  95         SFC_ASSERT(rxq != NULL);
  96         SFC_ASSERT(rxq->evq == evq);
  97         SFC_ASSERT(rxq->flags & SFC_EFX_RXQ_FLAG_STARTED);
  98
  99         stop = (id + 1) & rxq->ptr_mask;
 100         pending_id = rxq->pending & rxq->ptr_mask;
 101         delta = (stop >= pending_id) ? (stop - pending_id) :
 102                 (rxq->ptr_mask + 1 - pending_id + stop);
 103
 104         if (delta == 0) {
 105                 /*
 106                  * Rx event with no new descriptors done and zero length
 107                  * is used to abort scattered packet when there is no room
 108                  * for the tail.
 109                  */
 110                 if (unlikely(size != 0)) {
 111                         evq->exception = B_TRUE;
 112                         sfc_err(evq->sa,
 113                                 "EVQ %u RxQ %u invalid RX abort "
 114                                 "(id=%#x size=%u flags=%#x); needs restart",
 115                                 evq->evq_index, rxq->dp.dpq.queue_id,
 116                                 id, size, flags);
 117                         goto done;
 118                 }
 119
 120                 /* Add discard flag to the first fragment */
 121                 rxq->sw_desc[pending_id].flags |= EFX_DISCARD;
 122                 /* Remove continue flag from the last fragment */
 123                 rxq->sw_desc[id].flags &= ~EFX_PKT_CONT;
 124         } else if (unlikely(delta > rxq->batch_max)) {
 125                 evq->exception = B_TRUE;
 126
 127                 sfc_err(evq->sa,
 128                         "EVQ %u RxQ %u completion out of order "
 129                         "(id=%#x delta=%u flags=%#x); needs restart",
 130                         evq->evq_index, rxq->dp.dpq.queue_id,
 131                         id, delta, flags);
 132
 133                 goto done;
 134         }
 135
 136         for (i = pending_id; i != stop; i = (i + 1) & rxq->ptr_mask) {
 137                 rxd = &rxq->sw_desc[i];
 138
 139                 rxd->flags = flags;
 140
 141                 SFC_ASSERT(size < (1 << 16));
 142                 rxd->size = (uint16_t)size;
 143         }
 144
 145         rxq->pending += delta;
 146
 147 done:
 148         return B_FALSE;
 149 }
 150
 151 static boolean_t
 152 sfc_ev_dp_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
 153              __rte_unused uint32_t size, __rte_unused uint16_t flags)
 154 {
 155         struct sfc_evq *evq = arg;
 156         struct sfc_dp_rxq *dp_rxq;
 157
 158         dp_rxq = evq->dp_rxq;
 159         SFC_ASSERT(dp_rxq != NULL);
 160
 161         SFC_ASSERT(evq->sa->dp_rx->qrx_ev != NULL);
 162         return evq->sa->dp_rx->qrx_ev(dp_rxq, id);
 163 }
 164
 165 static boolean_t
 166 sfc_ev_nop_rx_ps(void *arg, uint32_t label, uint32_t id,
 167                  uint32_t pkt_count, uint16_t flags)
 168 {
 169         struct sfc_evq *evq = arg;
 170
 171         sfc_err(evq->sa,
 172                 "EVQ %u unexpected packed stream Rx event label=%u id=%#x pkt_count=%u flags=%#x",
 173                 evq->evq_index, label, id, pkt_count, flags);
 174         return B_TRUE;
 175 }
 176
 177 /* It is not actually used on datapath, but required on RxQ flush */
 178 static boolean_t
 179 sfc_ev_dp_rx_ps(void *arg, __rte_unused uint32_t label, uint32_t id,
 180                 __rte_unused uint32_t pkt_count, __rte_unused uint16_t flags)
 181 {
 182         struct sfc_evq *evq = arg;
 183         struct sfc_dp_rxq *dp_rxq;
 184
 185         dp_rxq = evq->dp_rxq;
 186         SFC_ASSERT(dp_rxq != NULL);
 187
 188         if (evq->sa->dp_rx->qrx_ps_ev != NULL)
 189                 return evq->sa->dp_rx->qrx_ps_ev(dp_rxq, id);
 190         else
 191                 return B_FALSE;
 192 }
 193
 194 static boolean_t
 195 sfc_ev_nop_tx(void *arg, uint32_t label, uint32_t id)
 196 {
 197         struct sfc_evq *evq = arg;
 198
 199         sfc_err(evq->sa, "EVQ %u unexpected Tx event label=%u id=%#x",
 200                 evq->evq_index, label, id);
 201         return B_TRUE;
 202 }
 203
 204 static boolean_t
 205 sfc_ev_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
 206 {
 207         struct sfc_evq *evq = arg;
 208         struct sfc_dp_txq *dp_txq;
 209         struct sfc_efx_txq *txq;
 210         unsigned int stop;
 211         unsigned int delta;
 212
 213         dp_txq = evq->dp_txq;
 214         SFC_ASSERT(dp_txq != NULL);
 215
 216         txq = sfc_efx_txq_by_dp_txq(dp_txq);
 217         SFC_ASSERT(txq->evq == evq);
 218
 219         if (unlikely((txq->flags & SFC_EFX_TXQ_FLAG_STARTED) == 0))
 220                 goto done;
 221
 222         stop = (id + 1) & txq->ptr_mask;
 223         id = txq->pending & txq->ptr_mask;
 224
 225         delta = (stop >= id) ? (stop - id) : (txq->ptr_mask + 1 - id + stop);
 226
 227         txq->pending += delta;
 228
 229 done:
 230         return B_FALSE;
 231 }
 232
 233 static boolean_t
 234 sfc_ev_dp_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
 235 {
 236         struct sfc_evq *evq = arg;
 237         struct sfc_dp_txq *dp_txq;
 238
 239         dp_txq = evq->dp_txq;
 240         SFC_ASSERT(dp_txq != NULL);
 241
 242         SFC_ASSERT(evq->sa->dp_tx->qtx_ev != NULL);
 243         return evq->sa->dp_tx->qtx_ev(dp_txq, id);
 244 }
 245
 246 static boolean_t
 247 sfc_ev_exception(void *arg, uint32_t code, __rte_unused uint32_t data)
 248 {
 249         struct sfc_evq *evq = arg;
 250
 251         if (code == EFX_EXCEPTION_UNKNOWN_SENSOREVT)
 252                 return B_FALSE;
 253
 254         evq->exception = B_TRUE;
 255         sfc_warn(evq->sa,
 256                  "hardware exception %s (code=%u, data=%#x) on EVQ %u;"
 257                  " needs recovery",
 258                  (code == EFX_EXCEPTION_RX_RECOVERY) ? "RX_RECOVERY" :
 259                  (code == EFX_EXCEPTION_RX_DSC_ERROR) ? "RX_DSC_ERROR" :
 260                  (code == EFX_EXCEPTION_TX_DSC_ERROR) ? "TX_DSC_ERROR" :
 261                  (code == EFX_EXCEPTION_FWALERT_SRAM) ? "FWALERT_SRAM" :
 262                  (code == EFX_EXCEPTION_UNKNOWN_FWALERT) ? "UNKNOWN_FWALERT" :
 263                  (code == EFX_EXCEPTION_RX_ERROR) ? "RX_ERROR" :
 264                  (code == EFX_EXCEPTION_TX_ERROR) ? "TX_ERROR" :
 265                  (code == EFX_EXCEPTION_EV_ERROR) ? "EV_ERROR" :
 266                  "UNKNOWN",
 267                  code, data, evq->evq_index);
 268
 269         return B_TRUE;
 270 }
 271
 272 static boolean_t
 273 sfc_ev_nop_rxq_flush_done(void *arg, uint32_t rxq_hw_index)
 274 {
 275         struct sfc_evq *evq = arg;
 276
 277         sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush done",
 278                 evq->evq_index, rxq_hw_index);
 279         return B_TRUE;
 280 }
 281
 282 static boolean_t
 283 sfc_ev_rxq_flush_done(void *arg, __rte_unused uint32_t rxq_hw_index)
 284 {
 285         struct sfc_evq *evq = arg;
 286         struct sfc_dp_rxq *dp_rxq;
 287         struct sfc_rxq *rxq;
 288
 289         dp_rxq = evq->dp_rxq;
 290         SFC_ASSERT(dp_rxq != NULL);
 291
 292         rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 293         SFC_ASSERT(rxq != NULL);
 294         SFC_ASSERT(rxq->hw_index == rxq_hw_index);
 295         SFC_ASSERT(rxq->evq == evq);
 296         sfc_rx_qflush_done(rxq);
 297
 298         return B_FALSE;
 299 }
 300
 301 static boolean_t
 302 sfc_ev_nop_rxq_flush_failed(void *arg, uint32_t rxq_hw_index)
 303 {
 304         struct sfc_evq *evq = arg;
 305
 306         sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush failed",
 307                 evq->evq_index, rxq_hw_index);
 308         return B_TRUE;
 309 }
 310
 311 static boolean_t
 312 sfc_ev_rxq_flush_failed(void *arg, __rte_unused uint32_t rxq_hw_index)
 313 {
 314         struct sfc_evq *evq = arg;
 315         struct sfc_dp_rxq *dp_rxq;
 316         struct sfc_rxq *rxq;
 317
 318         dp_rxq = evq->dp_rxq;
 319         SFC_ASSERT(dp_rxq != NULL);
 320
 321         rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 322         SFC_ASSERT(rxq != NULL);
 323         SFC_ASSERT(rxq->hw_index == rxq_hw_index);
 324         SFC_ASSERT(rxq->evq == evq);
 325         sfc_rx_qflush_failed(rxq);
 326
 327         return B_FALSE;
 328 }
 329
 330 static boolean_t
 331 sfc_ev_nop_txq_flush_done(void *arg, uint32_t txq_hw_index)
 332 {
 333         struct sfc_evq *evq = arg;
 334
 335         sfc_err(evq->sa, "EVQ %u unexpected TxQ %u flush done",
 336                 evq->evq_index, txq_hw_index);
 337         return B_TRUE;
 338 }
 339
 340 static boolean_t
 341 sfc_ev_txq_flush_done(void *arg, __rte_unused uint32_t txq_hw_index)
 342 {
 343         struct sfc_evq *evq = arg;
 344         struct sfc_dp_txq *dp_txq;
 345         struct sfc_txq *txq;
 346
 347         dp_txq = evq->dp_txq;
 348         SFC_ASSERT(dp_txq != NULL);
 349
 350         txq = sfc_txq_by_dp_txq(dp_txq);
 351         SFC_ASSERT(txq != NULL);
 352         SFC_ASSERT(txq->hw_index == txq_hw_index);
 353         SFC_ASSERT(txq->evq == evq);
 354         sfc_tx_qflush_done(txq);
 355
 356         return B_FALSE;
 357 }
 358
 359 static boolean_t
 360 sfc_ev_software(void *arg, uint16_t magic)
 361 {
 362         struct sfc_evq *evq = arg;
 363
 364         sfc_err(evq->sa, "EVQ %u unexpected software event magic=%#.4x",
 365                 evq->evq_index, magic);
 366         return B_TRUE;
 367 }
 368
 369 static boolean_t
 370 sfc_ev_sram(void *arg, uint32_t code)
 371 {
 372         struct sfc_evq *evq = arg;
 373
 374         sfc_err(evq->sa, "EVQ %u unexpected SRAM event code=%u",
 375                 evq->evq_index, code);
 376         return B_TRUE;
 377 }
 378
 379 static boolean_t
 380 sfc_ev_wake_up(void *arg, uint32_t index)
 381 {
 382         struct sfc_evq *evq = arg;
 383
 384         sfc_err(evq->sa, "EVQ %u unexpected wake up event index=%u",
 385                 evq->evq_index, index);
 386         return B_TRUE;
 387 }
 388
 389 static boolean_t
 390 sfc_ev_timer(void *arg, uint32_t index)
 391 {
 392         struct sfc_evq *evq = arg;
 393
 394         sfc_err(evq->sa, "EVQ %u unexpected timer event index=%u",
 395                 evq->evq_index, index);
 396         return B_TRUE;
 397 }
 398
 399 static boolean_t
 400 sfc_ev_nop_link_change(void *arg, __rte_unused efx_link_mode_t link_mode)
 401 {
 402         struct sfc_evq *evq = arg;
 403
 404         sfc_err(evq->sa, "EVQ %u unexpected link change event",
 405                 evq->evq_index);
 406         return B_TRUE;
 407 }
 408
 409 static boolean_t
 410 sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
 411 {
 412         struct sfc_evq *evq = arg;
 413         struct sfc_adapter *sa = evq->sa;
 414         struct rte_eth_link new_link;
 415
 416         sfc_port_link_mode_to_info(link_mode, &new_link);
 417         if (rte_eth_linkstatus_set(sa->eth_dev, &new_link))
 418                 evq->sa->port.lsc_seq++;
 419
 420         return B_FALSE;
 421 }
 422
 423 static const efx_ev_callbacks_t sfc_ev_callbacks = {
 424         .eec_initialized        = sfc_ev_initialized,
 425         .eec_rx                 = sfc_ev_nop_rx,
 426         .eec_rx_ps              = sfc_ev_nop_rx_ps,
 427         .eec_tx                 = sfc_ev_nop_tx,
 428         .eec_exception          = sfc_ev_exception,
 429         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 430         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 431         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 432         .eec_software           = sfc_ev_software,
 433         .eec_sram               = sfc_ev_sram,
 434         .eec_wake_up            = sfc_ev_wake_up,
 435         .eec_timer              = sfc_ev_timer,
 436         .eec_link_change        = sfc_ev_link_change,
 437 };
 438
 439 static const efx_ev_callbacks_t sfc_ev_callbacks_efx_rx = {
 440         .eec_initialized        = sfc_ev_initialized,
 441         .eec_rx                 = sfc_ev_efx_rx,
 442         .eec_rx_ps              = sfc_ev_nop_rx_ps,
 443         .eec_tx                 = sfc_ev_nop_tx,
 444         .eec_exception          = sfc_ev_exception,
 445         .eec_rxq_flush_done     = sfc_ev_rxq_flush_done,
 446         .eec_rxq_flush_failed   = sfc_ev_rxq_flush_failed,
 447         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 448         .eec_software           = sfc_ev_software,
 449         .eec_sram               = sfc_ev_sram,
 450         .eec_wake_up            = sfc_ev_wake_up,
 451         .eec_timer              = sfc_ev_timer,
 452         .eec_link_change        = sfc_ev_nop_link_change,
 453 };
 454
 455 static const efx_ev_callbacks_t sfc_ev_callbacks_dp_rx = {
 456         .eec_initialized        = sfc_ev_initialized,
 457         .eec_rx                 = sfc_ev_dp_rx,
 458         .eec_rx_ps              = sfc_ev_dp_rx_ps,
 459         .eec_tx                 = sfc_ev_nop_tx,
 460         .eec_exception          = sfc_ev_exception,
 461         .eec_rxq_flush_done     = sfc_ev_rxq_flush_done,
 462         .eec_rxq_flush_failed   = sfc_ev_rxq_flush_failed,
 463         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 464         .eec_software           = sfc_ev_software,
 465         .eec_sram               = sfc_ev_sram,
 466         .eec_wake_up            = sfc_ev_wake_up,
 467         .eec_timer              = sfc_ev_timer,
 468         .eec_link_change        = sfc_ev_nop_link_change,
 469 };
 470
 471 static const efx_ev_callbacks_t sfc_ev_callbacks_efx_tx = {
 472         .eec_initialized        = sfc_ev_initialized,
 473         .eec_rx                 = sfc_ev_nop_rx,
 474         .eec_rx_ps              = sfc_ev_nop_rx_ps,
 475         .eec_tx                 = sfc_ev_tx,
 476         .eec_exception          = sfc_ev_exception,
 477         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 478         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 479         .eec_txq_flush_done     = sfc_ev_txq_flush_done,
 480         .eec_software           = sfc_ev_software,
 481         .eec_sram               = sfc_ev_sram,
 482         .eec_wake_up            = sfc_ev_wake_up,
 483         .eec_timer              = sfc_ev_timer,
 484         .eec_link_change        = sfc_ev_nop_link_change,
 485 };
 486
 487 static const efx_ev_callbacks_t sfc_ev_callbacks_dp_tx = {
 488         .eec_initialized        = sfc_ev_initialized,
 489         .eec_rx                 = sfc_ev_nop_rx,
 490         .eec_rx_ps              = sfc_ev_nop_rx_ps,
 491         .eec_tx                 = sfc_ev_dp_tx,
 492         .eec_exception          = sfc_ev_exception,
 493         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 494         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 495         .eec_txq_flush_done     = sfc_ev_txq_flush_done,
 496         .eec_software           = sfc_ev_software,
 497         .eec_sram               = sfc_ev_sram,
 498         .eec_wake_up            = sfc_ev_wake_up,
 499         .eec_timer              = sfc_ev_timer,
 500         .eec_link_change        = sfc_ev_nop_link_change,
 501 };
 502
 503
 504 void
 505 sfc_ev_qpoll(struct sfc_evq *evq)
 506 {
 507         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED ||
 508                    evq->init_state == SFC_EVQ_STARTING);
 509
 510         /* Synchronize the DMA memory for reading not required */
 511
 512         efx_ev_qpoll(evq->common, &evq->read_ptr, evq->callbacks, evq);
 513
 514         if (unlikely(evq->exception) && sfc_adapter_trylock(evq->sa)) {
 515                 struct sfc_adapter *sa = evq->sa;
 516                 int rc;
 517
 518                 if (evq->dp_rxq != NULL) {
 519                         unsigned int rxq_sw_index;
 520
 521                         rxq_sw_index = evq->dp_rxq->dpq.queue_id;
 522
 523                         sfc_warn(sa,
 524                                  "restart RxQ %u because of exception on its EvQ %u",
 525                                  rxq_sw_index, evq->evq_index);
 526
 527                         sfc_rx_qstop(sa, rxq_sw_index);
 528                         rc = sfc_rx_qstart(sa, rxq_sw_index);
 529                         if (rc != 0)
 530                                 sfc_err(sa, "cannot restart RxQ %u",
 531                                         rxq_sw_index);
 532                 }
 533
 534                 if (evq->dp_txq != NULL) {
 535                         unsigned int txq_sw_index;
 536
 537                         txq_sw_index = evq->dp_txq->dpq.queue_id;
 538
 539                         sfc_warn(sa,
 540                                  "restart TxQ %u because of exception on its EvQ %u",
 541                                  txq_sw_index, evq->evq_index);
 542
 543                         sfc_tx_qstop(sa, txq_sw_index);
 544                         rc = sfc_tx_qstart(sa, txq_sw_index);
 545                         if (rc != 0)
 546                                 sfc_err(sa, "cannot restart TxQ %u",
 547                                         txq_sw_index);
 548                 }
 549
 550                 if (evq->exception)
 551                         sfc_panic(sa, "unrecoverable exception on EvQ %u",
 552                                   evq->evq_index);
 553
 554                 sfc_adapter_unlock(sa);
 555         }
 556
 557         /* Poll-mode driver does not re-prime the event queue for interrupts */
 558 }
 559
 560 void
 561 sfc_ev_mgmt_qpoll(struct sfc_adapter *sa)
 562 {
 563         if (rte_spinlock_trylock(&sa->mgmt_evq_lock)) {
 564                 if (sa->mgmt_evq_running)
 565                         sfc_ev_qpoll(sa->mgmt_evq);
 566
 567                 rte_spinlock_unlock(&sa->mgmt_evq_lock);
 568         }
 569 }
 570
 571 int
 572 sfc_ev_qprime(struct sfc_evq *evq)
 573 {
 574         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED);
 575         return efx_ev_qprime(evq->common, evq->read_ptr);
 576 }
 577
 578 /* Event queue HW index allocation scheme is described in sfc_ev.h. */
 579 int
 580 sfc_ev_qstart(struct sfc_evq *evq, unsigned int hw_index)
 581 {
 582         struct sfc_adapter *sa = evq->sa;
 583         efsys_mem_t *esmp;
 584         uint32_t evq_flags = sa->evq_flags;
 585         unsigned int total_delay_us;
 586         unsigned int delay_us;
 587         int rc;
 588
 589         sfc_log_init(sa, "hw_index=%u", hw_index);
 590
 591         esmp = &evq->mem;
 592
 593         evq->evq_index = hw_index;
 594
 595         /* Clear all events */
 596         (void)memset((void *)esmp->esm_base, 0xff, EFX_EVQ_SIZE(evq->entries));
 597
 598         if (sa->intr.lsc_intr && hw_index == sa->mgmt_evq_index)
 599                 evq_flags |= EFX_EVQ_FLAGS_NOTIFY_INTERRUPT;
 600         else
 601                 evq_flags |= EFX_EVQ_FLAGS_NOTIFY_DISABLED;
 602
 603         /* Create the common code event queue */
 604         rc = efx_ev_qcreate(sa->nic, hw_index, esmp, evq->entries,
 605                             0 /* unused on EF10 */, 0, evq_flags,
 606                             &evq->common);
 607         if (rc != 0)
 608                 goto fail_ev_qcreate;
 609
 610         SFC_ASSERT(evq->dp_rxq == NULL || evq->dp_txq == NULL);
 611         if (evq->dp_rxq != 0) {
 612                 if (strcmp(sa->dp_rx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
 613                         evq->callbacks = &sfc_ev_callbacks_efx_rx;
 614                 else
 615                         evq->callbacks = &sfc_ev_callbacks_dp_rx;
 616         } else if (evq->dp_txq != 0) {
 617                 if (strcmp(sa->dp_tx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
 618                         evq->callbacks = &sfc_ev_callbacks_efx_tx;
 619                 else
 620                         evq->callbacks = &sfc_ev_callbacks_dp_tx;
 621         } else {
 622                 evq->callbacks = &sfc_ev_callbacks;
 623         }
 624
 625         evq->init_state = SFC_EVQ_STARTING;
 626
 627         /* Wait for the initialization event */
 628         total_delay_us = 0;
 629         delay_us = SFC_EVQ_INIT_BACKOFF_START_US;
 630         do {
 631                 (void)sfc_ev_qpoll(evq);
 632
 633                 /* Check to see if the initialization complete indication
 634                  * posted by the hardware.
 635                  */
 636                 if (evq->init_state == SFC_EVQ_STARTED)
 637                         goto done;
 638
 639                 /* Give event queue some time to init */
 640                 rte_delay_us(delay_us);
 641
 642                 total_delay_us += delay_us;
 643
 644                 /* Exponential backoff */
 645                 delay_us *= 2;
 646                 if (delay_us > SFC_EVQ_INIT_BACKOFF_MAX_US)
 647                         delay_us = SFC_EVQ_INIT_BACKOFF_MAX_US;
 648
 649         } while (total_delay_us < SFC_EVQ_INIT_TIMEOUT_US);
 650
 651         rc = ETIMEDOUT;
 652         goto fail_timedout;
 653
 654 done:
 655         return 0;
 656
 657 fail_timedout:
 658         evq->init_state = SFC_EVQ_INITIALIZED;
 659         efx_ev_qdestroy(evq->common);
 660
 661 fail_ev_qcreate:
 662         sfc_log_init(sa, "failed %d", rc);
 663         return rc;
 664 }
 665
 666 void
 667 sfc_ev_qstop(struct sfc_evq *evq)
 668 {
 669         if (evq == NULL)
 670                 return;
 671
 672         sfc_log_init(evq->sa, "hw_index=%u", evq->evq_index);
 673
 674         if (evq->init_state != SFC_EVQ_STARTED)
 675                 return;
 676
 677         evq->init_state = SFC_EVQ_INITIALIZED;
 678         evq->callbacks = NULL;
 679         evq->read_ptr = 0;
 680         evq->exception = B_FALSE;
 681
 682         efx_ev_qdestroy(evq->common);
 683
 684         evq->evq_index = 0;
 685 }
 686
 687 static void
 688 sfc_ev_mgmt_periodic_qpoll(void *arg)
 689 {
 690         struct sfc_adapter *sa = arg;
 691         int rc;
 692
 693         sfc_ev_mgmt_qpoll(sa);
 694
 695         rc = rte_eal_alarm_set(SFC_MGMT_EV_QPOLL_PERIOD_US,
 696                                sfc_ev_mgmt_periodic_qpoll, sa);
 697         if (rc == -ENOTSUP) {
 698                 sfc_warn(sa, "alarms are not supported");
 699                 sfc_warn(sa, "management EVQ must be polled indirectly using no-wait link status update");
 700         } else if (rc != 0) {
 701                 sfc_err(sa,
 702                         "cannot rearm management EVQ polling alarm (rc=%d)",
 703                         rc);
 704         }
 705 }
 706
 707 static void
 708 sfc_ev_mgmt_periodic_qpoll_start(struct sfc_adapter *sa)
 709 {
 710         sfc_ev_mgmt_periodic_qpoll(sa);
 711 }
 712
 713 static void
 714 sfc_ev_mgmt_periodic_qpoll_stop(struct sfc_adapter *sa)
 715 {
 716         rte_eal_alarm_cancel(sfc_ev_mgmt_periodic_qpoll, sa);
 717 }
 718
 719 int
 720 sfc_ev_start(struct sfc_adapter *sa)
 721 {
 722         int rc;
 723
 724         sfc_log_init(sa, "entry");
 725
 726         rc = efx_ev_init(sa->nic);
 727         if (rc != 0)
 728                 goto fail_ev_init;
 729
 730         /* Start management EVQ used for global events */
 731
 732         /*
 733          * Management event queue start polls the queue, but it cannot
 734          * interfere with other polling contexts since mgmt_evq_running
 735          * is false yet.
 736          */
 737         rc = sfc_ev_qstart(sa->mgmt_evq, sa->mgmt_evq_index);
 738         if (rc != 0)
 739                 goto fail_mgmt_evq_start;
 740
 741         rte_spinlock_lock(&sa->mgmt_evq_lock);
 742         sa->mgmt_evq_running = true;
 743         rte_spinlock_unlock(&sa->mgmt_evq_lock);
 744
 745         if (sa->intr.lsc_intr) {
 746                 rc = sfc_ev_qprime(sa->mgmt_evq);
 747                 if (rc != 0)
 748                         goto fail_mgmt_evq_prime;
 749         }
 750
 751         /*
 752          * Start management EVQ polling. If interrupts are disabled
 753          * (not used), it is required to process link status change
 754          * and other device level events to avoid unrecoverable
 755          * error because the event queue overflow.
 756          */
 757         sfc_ev_mgmt_periodic_qpoll_start(sa);
 758
 759         /*
 760          * Rx/Tx event queues are started/stopped when corresponding
 761          * Rx/Tx queue is started/stopped.
 762          */
 763
 764         return 0;
 765
 766 fail_mgmt_evq_prime:
 767         sfc_ev_qstop(sa->mgmt_evq);
 768
 769 fail_mgmt_evq_start:
 770         efx_ev_fini(sa->nic);
 771
 772 fail_ev_init:
 773         sfc_log_init(sa, "failed %d", rc);
 774         return rc;
 775 }
 776
 777 void
 778 sfc_ev_stop(struct sfc_adapter *sa)
 779 {
 780         sfc_log_init(sa, "entry");
 781
 782         sfc_ev_mgmt_periodic_qpoll_stop(sa);
 783
 784         rte_spinlock_lock(&sa->mgmt_evq_lock);
 785         sa->mgmt_evq_running = false;
 786         rte_spinlock_unlock(&sa->mgmt_evq_lock);
 787
 788         sfc_ev_qstop(sa->mgmt_evq);
 789
 790         efx_ev_fini(sa->nic);
 791 }
 792
 793 int
 794 sfc_ev_qinit(struct sfc_adapter *sa,
 795              enum sfc_evq_type type, unsigned int type_index,
 796              unsigned int entries, int socket_id, struct sfc_evq **evqp)
 797 {
 798         struct sfc_evq *evq;
 799         int rc;
 800
 801         sfc_log_init(sa, "type=%s type_index=%u",
 802                      sfc_evq_type2str(type), type_index);
 803
 804         SFC_ASSERT(rte_is_power_of_2(entries));
 805
 806         rc = ENOMEM;
 807         evq = rte_zmalloc_socket("sfc-evq", sizeof(*evq), RTE_CACHE_LINE_SIZE,
 808                                  socket_id);
 809         if (evq == NULL)
 810                 goto fail_evq_alloc;
 811
 812         evq->sa = sa;
 813         evq->type = type;
 814         evq->entries = entries;
 815
 816         /* Allocate DMA space */
 817         rc = sfc_dma_alloc(sa, sfc_evq_type2str(type), type_index,
 818                            EFX_EVQ_SIZE(evq->entries), socket_id, &evq->mem);
 819         if (rc != 0)
 820                 goto fail_dma_alloc;
 821
 822         evq->init_state = SFC_EVQ_INITIALIZED;
 823
 824         sa->evq_count++;
 825
 826         *evqp = evq;
 827
 828         return 0;
 829
 830 fail_dma_alloc:
 831         rte_free(evq);
 832
 833 fail_evq_alloc:
 834
 835         sfc_log_init(sa, "failed %d", rc);
 836         return rc;
 837 }
 838
 839 void
 840 sfc_ev_qfini(struct sfc_evq *evq)
 841 {
 842         struct sfc_adapter *sa = evq->sa;
 843
 844         SFC_ASSERT(evq->init_state == SFC_EVQ_INITIALIZED);
 845
 846         sfc_dma_free(sa, &evq->mem);
 847
 848         rte_free(evq);
 849
 850         SFC_ASSERT(sa->evq_count > 0);
 851         sa->evq_count--;
 852 }
 853
 854 static int
 855 sfc_kvarg_perf_profile_handler(__rte_unused const char *key,
 856                                const char *value_str, void *opaque)
 857 {
 858         uint32_t *value = opaque;
 859
 860         if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_THROUGHPUT) == 0)
 861                 *value = EFX_EVQ_FLAGS_TYPE_THROUGHPUT;
 862         else if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_LOW_LATENCY) == 0)
 863                 *value = EFX_EVQ_FLAGS_TYPE_LOW_LATENCY;
 864         else if (strcasecmp(value_str, SFC_KVARG_PERF_PROFILE_AUTO) == 0)
 865                 *value = EFX_EVQ_FLAGS_TYPE_AUTO;
 866         else
 867                 return -EINVAL;
 868
 869         return 0;
 870 }
 871
 872 int
 873 sfc_ev_attach(struct sfc_adapter *sa)
 874 {
 875         int rc;
 876
 877         sfc_log_init(sa, "entry");
 878
 879         sa->evq_flags = EFX_EVQ_FLAGS_TYPE_THROUGHPUT;
 880         rc = sfc_kvargs_process(sa, SFC_KVARG_PERF_PROFILE,
 881                                 sfc_kvarg_perf_profile_handler,
 882                                 &sa->evq_flags);
 883         if (rc != 0) {
 884                 sfc_err(sa, "invalid %s parameter value",
 885                         SFC_KVARG_PERF_PROFILE);
 886                 goto fail_kvarg_perf_profile;
 887         }
 888
 889         sa->mgmt_evq_index = 0;
 890         rte_spinlock_init(&sa->mgmt_evq_lock);
 891
 892         rc = sfc_ev_qinit(sa, SFC_EVQ_TYPE_MGMT, 0, SFC_MGMT_EVQ_ENTRIES,
 893                           sa->socket_id, &sa->mgmt_evq);
 894         if (rc != 0)
 895                 goto fail_mgmt_evq_init;
 896
 897         /*
 898          * Rx/Tx event queues are created/destroyed when corresponding
 899          * Rx/Tx queue is created/destroyed.
 900          */
 901
 902         return 0;
 903
 904 fail_mgmt_evq_init:
 905
 906 fail_kvarg_perf_profile:
 907         sfc_log_init(sa, "failed %d", rc);
 908         return rc;
 909 }
 910
 911 void
 912 sfc_ev_detach(struct sfc_adapter *sa)
 913 {
 914         sfc_log_init(sa, "entry");
 915
 916         sfc_ev_qfini(sa->mgmt_evq);
 917
 918         if (sa->evq_count != 0)
 919                 sfc_err(sa, "%u EvQs are not destroyed before detach",
 920                         sa->evq_count);
 921 }