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

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  * Copyright (c) 2016-2017 Solarflare Communications Inc.
   5  * All rights reserved.
   6  *
   7  * This software was jointly developed between OKTET Labs (under contract
   8  * for Solarflare) and Solarflare Communications, Inc.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright notice,
  14  *    this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright notice,
  16  *    this list of conditions and the following disclaimer in the documentation
  17  *    and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  29  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <rte_debug.h>
  33 #include <rte_cycles.h>
  34 #include <rte_alarm.h>
  35 #include <rte_branch_prediction.h>
  36
  37 #include "efx.h"
  38
  39 #include "sfc.h"
  40 #include "sfc_debug.h"
  41 #include "sfc_log.h"
  42 #include "sfc_ev.h"
  43 #include "sfc_rx.h"
  44 #include "sfc_tx.h"
  45 #include "sfc_kvargs.h"
  46
  47
  48 /* Initial delay when waiting for event queue init complete event */
  49 #define SFC_EVQ_INIT_BACKOFF_START_US   (1)
  50 /* Maximum delay between event queue polling attempts */
  51 #define SFC_EVQ_INIT_BACKOFF_MAX_US     (10 * 1000)
  52 /* Event queue init approx timeout */
  53 #define SFC_EVQ_INIT_TIMEOUT_US         (2 * US_PER_S)
  54
  55 /* Management event queue polling period in microseconds */
  56 #define SFC_MGMT_EV_QPOLL_PERIOD_US     (US_PER_S)
  57
  58 static const char *
  59 sfc_evq_type2str(enum sfc_evq_type type)
  60 {
  61         switch (type) {
  62         case SFC_EVQ_TYPE_MGMT:
  63                 return "mgmt-evq";
  64         case SFC_EVQ_TYPE_RX:
  65                 return "rx-evq";
  66         case SFC_EVQ_TYPE_TX:
  67                 return "tx-evq";
  68         default:
  69                 SFC_ASSERT(B_FALSE);
  70                 return NULL;
  71         }
  72 }
  73
  74 static boolean_t
  75 sfc_ev_initialized(void *arg)
  76 {
  77         struct sfc_evq *evq = arg;
  78
  79         /* Init done events may be duplicated on SFN7xxx (SFC bug 31631) */
  80         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTING ||
  81                    evq->init_state == SFC_EVQ_STARTED);
  82
  83         evq->init_state = SFC_EVQ_STARTED;
  84
  85         return B_FALSE;
  86 }
  87
  88 static boolean_t
  89 sfc_ev_nop_rx(void *arg, uint32_t label, uint32_t id,
  90               uint32_t size, uint16_t flags)
  91 {
  92         struct sfc_evq *evq = arg;
  93
  94         sfc_err(evq->sa,
  95                 "EVQ %u unexpected Rx event label=%u id=%#x size=%u flags=%#x",
  96                 evq->evq_index, label, id, size, flags);
  97         return B_TRUE;
  98 }
  99
 100 static boolean_t
 101 sfc_ev_efx_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
 102               uint32_t size, uint16_t flags)
 103 {
 104         struct sfc_evq *evq = arg;
 105         struct sfc_efx_rxq *rxq;
 106         unsigned int stop;
 107         unsigned int pending_id;
 108         unsigned int delta;
 109         unsigned int i;
 110         struct sfc_efx_rx_sw_desc *rxd;
 111
 112         if (unlikely(evq->exception))
 113                 goto done;
 114
 115         rxq = sfc_efx_rxq_by_dp_rxq(evq->dp_rxq);
 116
 117         SFC_ASSERT(rxq != NULL);
 118         SFC_ASSERT(rxq->evq == evq);
 119         SFC_ASSERT(rxq->flags & SFC_EFX_RXQ_FLAG_STARTED);
 120
 121         stop = (id + 1) & rxq->ptr_mask;
 122         pending_id = rxq->pending & rxq->ptr_mask;
 123         delta = (stop >= pending_id) ? (stop - pending_id) :
 124                 (rxq->ptr_mask + 1 - pending_id + stop);
 125
 126         if (delta == 0) {
 127                 /*
 128                  * Rx event with no new descriptors done and zero length
 129                  * is used to abort scattered packet when there is no room
 130                  * for the tail.
 131                  */
 132                 if (unlikely(size != 0)) {
 133                         evq->exception = B_TRUE;
 134                         sfc_err(evq->sa,
 135                                 "EVQ %u RxQ %u invalid RX abort "
 136                                 "(id=%#x size=%u flags=%#x); needs restart",
 137                                 evq->evq_index, rxq->dp.dpq.queue_id,
 138                                 id, size, flags);
 139                         goto done;
 140                 }
 141
 142                 /* Add discard flag to the first fragment */
 143                 rxq->sw_desc[pending_id].flags |= EFX_DISCARD;
 144                 /* Remove continue flag from the last fragment */
 145                 rxq->sw_desc[id].flags &= ~EFX_PKT_CONT;
 146         } else if (unlikely(delta > rxq->batch_max)) {
 147                 evq->exception = B_TRUE;
 148
 149                 sfc_err(evq->sa,
 150                         "EVQ %u RxQ %u completion out of order "
 151                         "(id=%#x delta=%u flags=%#x); needs restart",
 152                         evq->evq_index, rxq->dp.dpq.queue_id,
 153                         id, delta, flags);
 154
 155                 goto done;
 156         }
 157
 158         for (i = pending_id; i != stop; i = (i + 1) & rxq->ptr_mask) {
 159                 rxd = &rxq->sw_desc[i];
 160
 161                 rxd->flags = flags;
 162
 163                 SFC_ASSERT(size < (1 << 16));
 164                 rxd->size = (uint16_t)size;
 165         }
 166
 167         rxq->pending += delta;
 168
 169 done:
 170         return B_FALSE;
 171 }
 172
 173 static boolean_t
 174 sfc_ev_dp_rx(void *arg, __rte_unused uint32_t label, uint32_t id,
 175              __rte_unused uint32_t size, __rte_unused uint16_t flags)
 176 {
 177         struct sfc_evq *evq = arg;
 178         struct sfc_dp_rxq *dp_rxq;
 179
 180         dp_rxq = evq->dp_rxq;
 181         SFC_ASSERT(dp_rxq != NULL);
 182
 183         SFC_ASSERT(evq->sa->dp_rx->qrx_ev != NULL);
 184         return evq->sa->dp_rx->qrx_ev(dp_rxq, id);
 185 }
 186
 187 static boolean_t
 188 sfc_ev_nop_tx(void *arg, uint32_t label, uint32_t id)
 189 {
 190         struct sfc_evq *evq = arg;
 191
 192         sfc_err(evq->sa, "EVQ %u unexpected Tx event label=%u id=%#x",
 193                 evq->evq_index, label, id);
 194         return B_TRUE;
 195 }
 196
 197 static boolean_t
 198 sfc_ev_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
 199 {
 200         struct sfc_evq *evq = arg;
 201         struct sfc_dp_txq *dp_txq;
 202         struct sfc_efx_txq *txq;
 203         unsigned int stop;
 204         unsigned int delta;
 205
 206         dp_txq = evq->dp_txq;
 207         SFC_ASSERT(dp_txq != NULL);
 208
 209         txq = sfc_efx_txq_by_dp_txq(dp_txq);
 210         SFC_ASSERT(txq->evq == evq);
 211
 212         if (unlikely((txq->flags & SFC_EFX_TXQ_FLAG_STARTED) == 0))
 213                 goto done;
 214
 215         stop = (id + 1) & txq->ptr_mask;
 216         id = txq->pending & txq->ptr_mask;
 217
 218         delta = (stop >= id) ? (stop - id) : (txq->ptr_mask + 1 - id + stop);
 219
 220         txq->pending += delta;
 221
 222 done:
 223         return B_FALSE;
 224 }
 225
 226 static boolean_t
 227 sfc_ev_dp_tx(void *arg, __rte_unused uint32_t label, uint32_t id)
 228 {
 229         struct sfc_evq *evq = arg;
 230         struct sfc_dp_txq *dp_txq;
 231
 232         dp_txq = evq->dp_txq;
 233         SFC_ASSERT(dp_txq != NULL);
 234
 235         SFC_ASSERT(evq->sa->dp_tx->qtx_ev != NULL);
 236         return evq->sa->dp_tx->qtx_ev(dp_txq, id);
 237 }
 238
 239 static boolean_t
 240 sfc_ev_exception(void *arg, __rte_unused uint32_t code,
 241                  __rte_unused uint32_t data)
 242 {
 243         struct sfc_evq *evq = arg;
 244
 245         if (code == EFX_EXCEPTION_UNKNOWN_SENSOREVT)
 246                 return B_FALSE;
 247
 248         evq->exception = B_TRUE;
 249         sfc_warn(evq->sa,
 250                  "hardware exception %s (code=%u, data=%#x) on EVQ %u;"
 251                  " needs recovery",
 252                  (code == EFX_EXCEPTION_RX_RECOVERY) ? "RX_RECOVERY" :
 253                  (code == EFX_EXCEPTION_RX_DSC_ERROR) ? "RX_DSC_ERROR" :
 254                  (code == EFX_EXCEPTION_TX_DSC_ERROR) ? "TX_DSC_ERROR" :
 255                  (code == EFX_EXCEPTION_FWALERT_SRAM) ? "FWALERT_SRAM" :
 256                  (code == EFX_EXCEPTION_UNKNOWN_FWALERT) ? "UNKNOWN_FWALERT" :
 257                  (code == EFX_EXCEPTION_RX_ERROR) ? "RX_ERROR" :
 258                  (code == EFX_EXCEPTION_TX_ERROR) ? "TX_ERROR" :
 259                  (code == EFX_EXCEPTION_EV_ERROR) ? "EV_ERROR" :
 260                  "UNKNOWN",
 261                  code, data, evq->evq_index);
 262
 263         return B_TRUE;
 264 }
 265
 266 static boolean_t
 267 sfc_ev_nop_rxq_flush_done(void *arg, uint32_t rxq_hw_index)
 268 {
 269         struct sfc_evq *evq = arg;
 270
 271         sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush done",
 272                 evq->evq_index, rxq_hw_index);
 273         return B_TRUE;
 274 }
 275
 276 static boolean_t
 277 sfc_ev_rxq_flush_done(void *arg, __rte_unused uint32_t rxq_hw_index)
 278 {
 279         struct sfc_evq *evq = arg;
 280         struct sfc_dp_rxq *dp_rxq;
 281         struct sfc_rxq *rxq;
 282
 283         dp_rxq = evq->dp_rxq;
 284         SFC_ASSERT(dp_rxq != NULL);
 285
 286         rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 287         SFC_ASSERT(rxq != NULL);
 288         SFC_ASSERT(rxq->hw_index == rxq_hw_index);
 289         SFC_ASSERT(rxq->evq == evq);
 290         sfc_rx_qflush_done(rxq);
 291
 292         return B_FALSE;
 293 }
 294
 295 static boolean_t
 296 sfc_ev_nop_rxq_flush_failed(void *arg, uint32_t rxq_hw_index)
 297 {
 298         struct sfc_evq *evq = arg;
 299
 300         sfc_err(evq->sa, "EVQ %u unexpected RxQ %u flush failed",
 301                 evq->evq_index, rxq_hw_index);
 302         return B_TRUE;
 303 }
 304
 305 static boolean_t
 306 sfc_ev_rxq_flush_failed(void *arg, __rte_unused uint32_t rxq_hw_index)
 307 {
 308         struct sfc_evq *evq = arg;
 309         struct sfc_dp_rxq *dp_rxq;
 310         struct sfc_rxq *rxq;
 311
 312         dp_rxq = evq->dp_rxq;
 313         SFC_ASSERT(dp_rxq != NULL);
 314
 315         rxq = sfc_rxq_by_dp_rxq(dp_rxq);
 316         SFC_ASSERT(rxq != NULL);
 317         SFC_ASSERT(rxq->hw_index == rxq_hw_index);
 318         SFC_ASSERT(rxq->evq == evq);
 319         sfc_rx_qflush_failed(rxq);
 320
 321         return B_FALSE;
 322 }
 323
 324 static boolean_t
 325 sfc_ev_nop_txq_flush_done(void *arg, uint32_t txq_hw_index)
 326 {
 327         struct sfc_evq *evq = arg;
 328
 329         sfc_err(evq->sa, "EVQ %u unexpected TxQ %u flush done",
 330                 evq->evq_index, txq_hw_index);
 331         return B_TRUE;
 332 }
 333
 334 static boolean_t
 335 sfc_ev_txq_flush_done(void *arg, __rte_unused uint32_t txq_hw_index)
 336 {
 337         struct sfc_evq *evq = arg;
 338         struct sfc_dp_txq *dp_txq;
 339         struct sfc_txq *txq;
 340
 341         dp_txq = evq->dp_txq;
 342         SFC_ASSERT(dp_txq != NULL);
 343
 344         txq = sfc_txq_by_dp_txq(dp_txq);
 345         SFC_ASSERT(txq != NULL);
 346         SFC_ASSERT(txq->hw_index == txq_hw_index);
 347         SFC_ASSERT(txq->evq == evq);
 348         sfc_tx_qflush_done(txq);
 349
 350         return B_FALSE;
 351 }
 352
 353 static boolean_t
 354 sfc_ev_software(void *arg, uint16_t magic)
 355 {
 356         struct sfc_evq *evq = arg;
 357
 358         sfc_err(evq->sa, "EVQ %u unexpected software event magic=%#.4x",
 359                 evq->evq_index, magic);
 360         return B_TRUE;
 361 }
 362
 363 static boolean_t
 364 sfc_ev_sram(void *arg, uint32_t code)
 365 {
 366         struct sfc_evq *evq = arg;
 367
 368         sfc_err(evq->sa, "EVQ %u unexpected SRAM event code=%u",
 369                 evq->evq_index, code);
 370         return B_TRUE;
 371 }
 372
 373 static boolean_t
 374 sfc_ev_wake_up(void *arg, uint32_t index)
 375 {
 376         struct sfc_evq *evq = arg;
 377
 378         sfc_err(evq->sa, "EVQ %u unexpected wake up event index=%u",
 379                 evq->evq_index, index);
 380         return B_TRUE;
 381 }
 382
 383 static boolean_t
 384 sfc_ev_timer(void *arg, uint32_t index)
 385 {
 386         struct sfc_evq *evq = arg;
 387
 388         sfc_err(evq->sa, "EVQ %u unexpected timer event index=%u",
 389                 evq->evq_index, index);
 390         return B_TRUE;
 391 }
 392
 393 static boolean_t
 394 sfc_ev_nop_link_change(void *arg, __rte_unused efx_link_mode_t link_mode)
 395 {
 396         struct sfc_evq *evq = arg;
 397
 398         sfc_err(evq->sa, "EVQ %u unexpected link change event",
 399                 evq->evq_index);
 400         return B_TRUE;
 401 }
 402
 403 static boolean_t
 404 sfc_ev_link_change(void *arg, efx_link_mode_t link_mode)
 405 {
 406         struct sfc_evq *evq = arg;
 407         struct sfc_adapter *sa = evq->sa;
 408         struct rte_eth_link *dev_link = &sa->eth_dev->data->dev_link;
 409         struct rte_eth_link new_link;
 410         uint64_t new_link_u64;
 411         uint64_t old_link_u64;
 412
 413         EFX_STATIC_ASSERT(sizeof(*dev_link) == sizeof(rte_atomic64_t));
 414
 415         sfc_port_link_mode_to_info(link_mode, &new_link);
 416
 417         new_link_u64 = *(uint64_t *)&new_link;
 418         do {
 419                 old_link_u64 = rte_atomic64_read((rte_atomic64_t *)dev_link);
 420                 if (old_link_u64 == new_link_u64)
 421                         break;
 422
 423                 if (rte_atomic64_cmpset((volatile uint64_t *)dev_link,
 424                                         old_link_u64, new_link_u64)) {
 425                         evq->sa->port.lsc_seq++;
 426                         break;
 427                 }
 428         } while (B_TRUE);
 429
 430         return B_FALSE;
 431 }
 432
 433 static const efx_ev_callbacks_t sfc_ev_callbacks = {
 434         .eec_initialized        = sfc_ev_initialized,
 435         .eec_rx                 = sfc_ev_nop_rx,
 436         .eec_tx                 = sfc_ev_nop_tx,
 437         .eec_exception          = sfc_ev_exception,
 438         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 439         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 440         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 441         .eec_software           = sfc_ev_software,
 442         .eec_sram               = sfc_ev_sram,
 443         .eec_wake_up            = sfc_ev_wake_up,
 444         .eec_timer              = sfc_ev_timer,
 445         .eec_link_change        = sfc_ev_link_change,
 446 };
 447
 448 static const efx_ev_callbacks_t sfc_ev_callbacks_efx_rx = {
 449         .eec_initialized        = sfc_ev_initialized,
 450         .eec_rx                 = sfc_ev_efx_rx,
 451         .eec_tx                 = sfc_ev_nop_tx,
 452         .eec_exception          = sfc_ev_exception,
 453         .eec_rxq_flush_done     = sfc_ev_rxq_flush_done,
 454         .eec_rxq_flush_failed   = sfc_ev_rxq_flush_failed,
 455         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 456         .eec_software           = sfc_ev_software,
 457         .eec_sram               = sfc_ev_sram,
 458         .eec_wake_up            = sfc_ev_wake_up,
 459         .eec_timer              = sfc_ev_timer,
 460         .eec_link_change        = sfc_ev_nop_link_change,
 461 };
 462
 463 static const efx_ev_callbacks_t sfc_ev_callbacks_dp_rx = {
 464         .eec_initialized        = sfc_ev_initialized,
 465         .eec_rx                 = sfc_ev_dp_rx,
 466         .eec_tx                 = sfc_ev_nop_tx,
 467         .eec_exception          = sfc_ev_exception,
 468         .eec_rxq_flush_done     = sfc_ev_rxq_flush_done,
 469         .eec_rxq_flush_failed   = sfc_ev_rxq_flush_failed,
 470         .eec_txq_flush_done     = sfc_ev_nop_txq_flush_done,
 471         .eec_software           = sfc_ev_software,
 472         .eec_sram               = sfc_ev_sram,
 473         .eec_wake_up            = sfc_ev_wake_up,
 474         .eec_timer              = sfc_ev_timer,
 475         .eec_link_change        = sfc_ev_nop_link_change,
 476 };
 477
 478 static const efx_ev_callbacks_t sfc_ev_callbacks_efx_tx = {
 479         .eec_initialized        = sfc_ev_initialized,
 480         .eec_rx                 = sfc_ev_nop_rx,
 481         .eec_tx                 = sfc_ev_tx,
 482         .eec_exception          = sfc_ev_exception,
 483         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 484         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 485         .eec_txq_flush_done     = sfc_ev_txq_flush_done,
 486         .eec_software           = sfc_ev_software,
 487         .eec_sram               = sfc_ev_sram,
 488         .eec_wake_up            = sfc_ev_wake_up,
 489         .eec_timer              = sfc_ev_timer,
 490         .eec_link_change        = sfc_ev_nop_link_change,
 491 };
 492
 493 static const efx_ev_callbacks_t sfc_ev_callbacks_dp_tx = {
 494         .eec_initialized        = sfc_ev_initialized,
 495         .eec_rx                 = sfc_ev_nop_rx,
 496         .eec_tx                 = sfc_ev_dp_tx,
 497         .eec_exception          = sfc_ev_exception,
 498         .eec_rxq_flush_done     = sfc_ev_nop_rxq_flush_done,
 499         .eec_rxq_flush_failed   = sfc_ev_nop_rxq_flush_failed,
 500         .eec_txq_flush_done     = sfc_ev_txq_flush_done,
 501         .eec_software           = sfc_ev_software,
 502         .eec_sram               = sfc_ev_sram,
 503         .eec_wake_up            = sfc_ev_wake_up,
 504         .eec_timer              = sfc_ev_timer,
 505         .eec_link_change        = sfc_ev_nop_link_change,
 506 };
 507
 508
 509 void
 510 sfc_ev_qpoll(struct sfc_evq *evq)
 511 {
 512         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED ||
 513                    evq->init_state == SFC_EVQ_STARTING);
 514
 515         /* Synchronize the DMA memory for reading not required */
 516
 517         efx_ev_qpoll(evq->common, &evq->read_ptr, evq->callbacks, evq);
 518
 519         if (unlikely(evq->exception) && sfc_adapter_trylock(evq->sa)) {
 520                 struct sfc_adapter *sa = evq->sa;
 521                 int rc;
 522
 523                 if (evq->dp_rxq != NULL) {
 524                         unsigned int rxq_sw_index;
 525
 526                         rxq_sw_index = evq->dp_rxq->dpq.queue_id;
 527
 528                         sfc_warn(sa,
 529                                  "restart RxQ %u because of exception on its EvQ %u",
 530                                  rxq_sw_index, evq->evq_index);
 531
 532                         sfc_rx_qstop(sa, rxq_sw_index);
 533                         rc = sfc_rx_qstart(sa, rxq_sw_index);
 534                         if (rc != 0)
 535                                 sfc_err(sa, "cannot restart RxQ %u",
 536                                         rxq_sw_index);
 537                 }
 538
 539                 if (evq->dp_txq != NULL) {
 540                         unsigned int txq_sw_index;
 541
 542                         txq_sw_index = evq->dp_txq->dpq.queue_id;
 543
 544                         sfc_warn(sa,
 545                                  "restart TxQ %u because of exception on its EvQ %u",
 546                                  txq_sw_index, evq->evq_index);
 547
 548                         sfc_tx_qstop(sa, txq_sw_index);
 549                         rc = sfc_tx_qstart(sa, txq_sw_index);
 550                         if (rc != 0)
 551                                 sfc_err(sa, "cannot restart TxQ %u",
 552                                         txq_sw_index);
 553                 }
 554
 555                 if (evq->exception)
 556                         sfc_panic(sa, "unrecoverable exception on EvQ %u",
 557                                   evq->evq_index);
 558
 559                 sfc_adapter_unlock(sa);
 560         }
 561
 562         /* Poll-mode driver does not re-prime the event queue for interrupts */
 563 }
 564
 565 void
 566 sfc_ev_mgmt_qpoll(struct sfc_adapter *sa)
 567 {
 568         if (rte_spinlock_trylock(&sa->mgmt_evq_lock)) {
 569                 struct sfc_evq *mgmt_evq = sa->mgmt_evq;
 570
 571                 if (mgmt_evq->init_state == SFC_EVQ_STARTED)
 572                         sfc_ev_qpoll(mgmt_evq);
 573
 574                 rte_spinlock_unlock(&sa->mgmt_evq_lock);
 575         }
 576 }
 577
 578 int
 579 sfc_ev_qprime(struct sfc_evq *evq)
 580 {
 581         SFC_ASSERT(evq->init_state == SFC_EVQ_STARTED);
 582         return efx_ev_qprime(evq->common, evq->read_ptr);
 583 }
 584
 585 /* Event queue HW index allocation scheme is described in sfc_ev.h. */
 586 int
 587 sfc_ev_qstart(struct sfc_evq *evq, unsigned int hw_index)
 588 {
 589         struct sfc_adapter *sa = evq->sa;
 590         efsys_mem_t *esmp;
 591         uint32_t evq_flags = sa->evq_flags;
 592         unsigned int total_delay_us;
 593         unsigned int delay_us;
 594         int rc;
 595
 596         sfc_log_init(sa, "hw_index=%u", hw_index);
 597
 598         esmp = &evq->mem;
 599
 600         evq->evq_index = hw_index;
 601
 602         /* Clear all events */
 603         (void)memset((void *)esmp->esm_base, 0xff, EFX_EVQ_SIZE(evq->entries));
 604
 605         if (sa->intr.lsc_intr && hw_index == sa->mgmt_evq_index)
 606                 evq_flags |= EFX_EVQ_FLAGS_NOTIFY_INTERRUPT;
 607         else
 608                 evq_flags |= EFX_EVQ_FLAGS_NOTIFY_DISABLED;
 609
 610         /* Create the common code event queue */
 611         rc = efx_ev_qcreate(sa->nic, hw_index, esmp, evq->entries,
 612                             0 /* unused on EF10 */, 0, evq_flags,
 613                             &evq->common);
 614         if (rc != 0)
 615                 goto fail_ev_qcreate;
 616
 617         SFC_ASSERT(evq->dp_rxq == NULL || evq->dp_txq == NULL);
 618         if (evq->dp_rxq != 0) {
 619                 if (strcmp(sa->dp_rx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
 620                         evq->callbacks = &sfc_ev_callbacks_efx_rx;
 621                 else
 622                         evq->callbacks = &sfc_ev_callbacks_dp_rx;
 623         } else if (evq->dp_txq != 0) {
 624                 if (strcmp(sa->dp_tx->dp.name, SFC_KVARG_DATAPATH_EFX) == 0)
 625                         evq->callbacks = &sfc_ev_callbacks_efx_tx;
 626                 else
 627                         evq->callbacks = &sfc_ev_callbacks_dp_tx;
 628         } else {
 629                 evq->callbacks = &sfc_ev_callbacks;
 630         }
 631
 632         evq->init_state = SFC_EVQ_STARTING;
 633
 634         /* Wait for the initialization event */
 635         total_delay_us = 0;
 636         delay_us = SFC_EVQ_INIT_BACKOFF_START_US;
 637         do {
 638                 (void)sfc_ev_qpoll(evq);
 639
 640                 /* Check to see if the initialization complete indication
 641                  * posted by the hardware.
 642                  */
 643                 if (evq->init_state == SFC_EVQ_STARTED)
 644                         goto done;
 645
 646                 /* Give event queue some time to init */
 647                 rte_delay_us(delay_us);
 648
 649                 total_delay_us += delay_us;
 650
 651                 /* Exponential backoff */
 652                 delay_us *= 2;
 653                 if (delay_us > SFC_EVQ_INIT_BACKOFF_MAX_US)
 654                         delay_us = SFC_EVQ_INIT_BACKOFF_MAX_US;
 655
 656         } while (total_delay_us < SFC_EVQ_INIT_TIMEOUT_US);
 657
 658         rc = ETIMEDOUT;
 659         goto fail_timedout;
 660
 661 done:
 662         return 0;
 663
 664 fail_timedout:
 665         evq->init_state = SFC_EVQ_INITIALIZED;
 666         efx_ev_qdestroy(evq->common);
 667
 668 fail_ev_qcreate:
 669         sfc_log_init(sa, "failed %d", rc);
 670         return rc;
 671 }
 672
 673 void
 674 sfc_ev_qstop(struct sfc_evq *evq)
 675 {
 676         if (evq == NULL)
 677                 return;
 678
 679         sfc_log_init(evq->sa, "hw_index=%u", evq->evq_index);
 680
 681         if (evq->init_state != SFC_EVQ_STARTED)
 682                 return;
 683
 684         evq->init_state = SFC_EVQ_INITIALIZED;
 685         evq->callbacks = NULL;
 686         evq->read_ptr = 0;
 687         evq->exception = B_FALSE;
 688
 689         efx_ev_qdestroy(evq->common);
 690
 691         evq->evq_index = 0;
 692 }
 693
 694 static void
 695 sfc_ev_mgmt_periodic_qpoll(void *arg)
 696 {
 697         struct sfc_adapter *sa = arg;
 698         int rc;
 699
 700         sfc_ev_mgmt_qpoll(sa);
 701
 702         rc = rte_eal_alarm_set(SFC_MGMT_EV_QPOLL_PERIOD_US,
 703                                sfc_ev_mgmt_periodic_qpoll, sa);
 704         if (rc == -ENOTSUP) {
 705                 sfc_warn(sa, "alarms are not supported");
 706                 sfc_warn(sa, "management EVQ must be polled indirectly using no-wait link status update");
 707         } else if (rc != 0) {
 708                 sfc_err(sa,
 709                         "cannot rearm management EVQ polling alarm (rc=%d)",
 710                         rc);
 711         }
 712 }
 713
 714 static void
 715 sfc_ev_mgmt_periodic_qpoll_start(struct sfc_adapter *sa)
 716 {
 717         sfc_ev_mgmt_periodic_qpoll(sa);
 718 }
 719
 720 static void
 721 sfc_ev_mgmt_periodic_qpoll_stop(struct sfc_adapter *sa)
 722 {
 723         rte_eal_alarm_cancel(sfc_ev_mgmt_periodic_qpoll, sa);
 724 }
 725
 726 int
 727 sfc_ev_start(struct sfc_adapter *sa)
 728 {
 729         int rc;
 730
 731         sfc_log_init(sa, "entry");
 732
 733         rc = efx_ev_init(sa->nic);
 734         if (rc != 0)
 735                 goto fail_ev_init;
 736
 737         /* Start management EVQ used for global events */
 738         rte_spinlock_lock(&sa->mgmt_evq_lock);
 739
 740         rc = sfc_ev_qstart(sa->mgmt_evq, sa->mgmt_evq_index);
 741         if (rc != 0)
 742                 goto fail_mgmt_evq_start;
 743
 744         if (sa->intr.lsc_intr) {
 745                 rc = sfc_ev_qprime(sa->mgmt_evq);
 746                 if (rc != 0)
 747                         goto fail_evq0_prime;
 748         }
 749
 750         rte_spinlock_unlock(&sa->mgmt_evq_lock);
 751
 752         /*
 753          * Start management EVQ polling. If interrupts are disabled
 754          * (not used), it is required to process link status change
 755          * and other device level events to avoid unrecoverable
 756          * error because the event queue overflow.
 757          */
 758         sfc_ev_mgmt_periodic_qpoll_start(sa);
 759
 760         /*
 761          * Rx/Tx event queues are started/stopped when corresponding
 762          * Rx/Tx queue is started/stopped.
 763          */
 764
 765         return 0;
 766
 767 fail_evq0_prime:
 768         sfc_ev_qstop(sa->mgmt_evq);
 769
 770 fail_mgmt_evq_start:
 771         rte_spinlock_unlock(&sa->mgmt_evq_lock);
 772         efx_ev_fini(sa->nic);
 773
 774 fail_ev_init:
 775         sfc_log_init(sa, "failed %d", rc);
 776         return rc;
 777 }
 778
 779 void
 780 sfc_ev_stop(struct sfc_adapter *sa)
 781 {
 782         sfc_log_init(sa, "entry");
 783
 784         sfc_ev_mgmt_periodic_qpoll_stop(sa);
 785
 786         rte_spinlock_lock(&sa->mgmt_evq_lock);
 787         sfc_ev_qstop(sa->mgmt_evq);
 788         rte_spinlock_unlock(&sa->mgmt_evq_lock);
 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         uint64_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 }