drivers/net/sfc/sfc_ef10_essb_rx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2021 Xilinx, Inc.
   4  * Copyright(c) 2017-2019 Solarflare Communications Inc.
   5  *
   6  * This software was jointly developed between OKTET Labs (under contract
   7  * for Solarflare) and Solarflare Communications, Inc.
   8  */
   9
  10 /* EF10 equal stride packed stream receive native datapath implementation */
  11
  12 #include <stdbool.h>
  13
  14 #include <rte_byteorder.h>
  15 #include <rte_mbuf.h>
  16 #include <rte_io.h>
  17
  18 #include "efx_types.h"
  19 #include "efx_regs_ef10.h"
  20 #include "efx.h"
  21
  22 #include "sfc_debug.h"
  23 #include "sfc_tweak.h"
  24 #include "sfc_dp_rx.h"
  25 #include "sfc_kvargs.h"
  26 #include "sfc_ef10.h"
  27
  28 /* Tunnels are not supported */
  29 #define SFC_EF10_RX_EV_ENCAP_SUPPORT    0
  30 #include "sfc_ef10_rx_ev.h"
  31
  32 #define sfc_ef10_essb_rx_err(dpq, ...) \
  33         SFC_DP_LOG(SFC_KVARG_DATAPATH_EF10_ESSB, ERR, dpq, __VA_ARGS__)
  34
  35 #define sfc_ef10_essb_rx_info(dpq, ...) \
  36         SFC_DP_LOG(SFC_KVARG_DATAPATH_EF10_ESSB, INFO, dpq, __VA_ARGS__)
  37
  38 /*
  39  * Fake length for RXQ descriptors in equal stride super-buffer mode
  40  * to make hardware happy.
  41  */
  42 #define SFC_EF10_ESSB_RX_FAKE_BUF_SIZE  32
  43
  44 /**
  45  * Minimum number of Rx buffers the datapath allows to use.
  46  *
  47  * Each HW Rx descriptor has many Rx buffers. The number of buffers
  48  * in one HW Rx descriptor is equal to size of contiguous block
  49  * provided by Rx buffers memory pool. The contiguous block size
  50  * depends on RTE_DRIVER_MEMPOOL_BUCKET_SIZE_KB and rte_mbuf
  51  * data size specified on the memory pool creation. Typical rte_mbuf
  52  * data size is about 2k which makes a bit less than 32 buffers in
  53  * contiguous block with default bucket size equal to 64k.
  54  * Since HW Rx descriptors are pushed by 8 (see SFC_EF10_RX_WPTR_ALIGN),
  55  * it makes about 256 as required minimum. Double it in advertised
  56  * minimum to allow for at least 2 refill blocks.
  57  */
  58 #define SFC_EF10_ESSB_RX_DESCS_MIN      512
  59
  60 /**
  61  * Number of Rx buffers should be aligned to.
  62  *
  63  * There are no extra requirements on alignment since actual number of
  64  * pushed Rx buffers will be multiple by contiguous block size which
  65  * is unknown beforehand.
  66  */
  67 #define SFC_EF10_ESSB_RX_DESCS_ALIGN    1
  68
  69 /**
  70  * Maximum number of descriptors/buffers in the Rx ring.
  71  * It should guarantee that corresponding event queue never overfill.
  72  */
  73 #define SFC_EF10_ESSB_RXQ_LIMIT(_nevs) \
  74         ((_nevs) - 1 /* head must not step on tail */ - \
  75          (SFC_EF10_EV_PER_CACHE_LINE - 1) /* max unused EvQ entries */ - \
  76          1 /* Rx error */ - 1 /* flush */)
  77
  78 struct sfc_ef10_essb_rx_sw_desc {
  79         struct rte_mbuf                 *first_mbuf;
  80 };
  81
  82 struct sfc_ef10_essb_rxq {
  83         /* Used on data path */
  84         unsigned int                    flags;
  85 #define SFC_EF10_ESSB_RXQ_STARTED       0x1
  86 #define SFC_EF10_ESSB_RXQ_NOT_RUNNING   0x2
  87 #define SFC_EF10_ESSB_RXQ_EXCEPTION     0x4
  88         unsigned int                    rxq_ptr_mask;
  89         unsigned int                    block_size;
  90         unsigned int                    buf_stride;
  91         unsigned int                    bufs_ptr;
  92         unsigned int                    completed;
  93         unsigned int                    pending_id;
  94         unsigned int                    bufs_pending;
  95         unsigned int                    left_in_completed;
  96         unsigned int                    left_in_pending;
  97         unsigned int                    evq_read_ptr;
  98         unsigned int                    evq_ptr_mask;
  99         efx_qword_t                     *evq_hw_ring;
 100         struct sfc_ef10_essb_rx_sw_desc *sw_ring;
 101         uint16_t                        port_id;
 102
 103         /* Used on refill */
 104         unsigned int                    added;
 105         unsigned int                    max_fill_level;
 106         unsigned int                    refill_threshold;
 107         struct rte_mempool              *refill_mb_pool;
 108         efx_qword_t                     *rxq_hw_ring;
 109         volatile void                   *doorbell;
 110
 111         /* Datapath receive queue anchor */
 112         struct sfc_dp_rxq               dp;
 113 };
 114
 115 static inline struct sfc_ef10_essb_rxq *
 116 sfc_ef10_essb_rxq_by_dp_rxq(struct sfc_dp_rxq *dp_rxq)
 117 {
 118         return container_of(dp_rxq, struct sfc_ef10_essb_rxq, dp);
 119 }
 120
 121 static struct rte_mbuf *
 122 sfc_ef10_essb_next_mbuf(const struct sfc_ef10_essb_rxq *rxq,
 123                         struct rte_mbuf *mbuf)
 124 {
 125         struct rte_mbuf *m;
 126
 127         m = (struct rte_mbuf *)((uintptr_t)mbuf + rxq->buf_stride);
 128         __rte_mbuf_raw_sanity_check(m);
 129         return m;
 130 }
 131
 132 static struct rte_mbuf *
 133 sfc_ef10_essb_mbuf_by_index(const struct sfc_ef10_essb_rxq *rxq,
 134                             struct rte_mbuf *mbuf, unsigned int idx)
 135 {
 136         struct rte_mbuf *m;
 137
 138         m = (struct rte_mbuf *)((uintptr_t)mbuf + idx * rxq->buf_stride);
 139         __rte_mbuf_raw_sanity_check(m);
 140         return m;
 141 }
 142
 143 static struct rte_mbuf *
 144 sfc_ef10_essb_maybe_next_completed(struct sfc_ef10_essb_rxq *rxq)
 145 {
 146         const struct sfc_ef10_essb_rx_sw_desc *rxd;
 147
 148         if (rxq->left_in_completed != 0) {
 149                 rxd = &rxq->sw_ring[rxq->completed & rxq->rxq_ptr_mask];
 150                 return sfc_ef10_essb_mbuf_by_index(rxq, rxd->first_mbuf,
 151                                 rxq->block_size - rxq->left_in_completed);
 152         } else {
 153                 rxq->completed++;
 154                 rxd = &rxq->sw_ring[rxq->completed & rxq->rxq_ptr_mask];
 155                 rxq->left_in_completed = rxq->block_size;
 156                 return rxd->first_mbuf;
 157         }
 158 }
 159
 160 static void
 161 sfc_ef10_essb_rx_qrefill(struct sfc_ef10_essb_rxq *rxq)
 162 {
 163         const unsigned int rxq_ptr_mask = rxq->rxq_ptr_mask;
 164         unsigned int free_space;
 165         unsigned int bulks;
 166         void *mbuf_blocks[SFC_EF10_RX_WPTR_ALIGN];
 167         unsigned int added = rxq->added;
 168
 169         free_space = rxq->max_fill_level - (added - rxq->completed);
 170
 171         if (free_space < rxq->refill_threshold)
 172                 return;
 173
 174         bulks = free_space / RTE_DIM(mbuf_blocks);
 175         /* refill_threshold guarantees that bulks is positive */
 176         SFC_ASSERT(bulks > 0);
 177
 178         do {
 179                 unsigned int id;
 180                 unsigned int i;
 181
 182                 if (unlikely(rte_mempool_get_contig_blocks(rxq->refill_mb_pool,
 183                                 mbuf_blocks, RTE_DIM(mbuf_blocks)) < 0)) {
 184                         struct rte_eth_dev_data *dev_data =
 185                                 rte_eth_devices[rxq->port_id].data;
 186
 187                         /*
 188                          * It is hardly a safe way to increment counter
 189                          * from different contexts, but all PMDs do it.
 190                          */
 191                         dev_data->rx_mbuf_alloc_failed += RTE_DIM(mbuf_blocks);
 192                         /* Return if we have posted nothing yet */
 193                         if (added == rxq->added)
 194                                 return;
 195                         /* Push posted */
 196                         break;
 197                 }
 198
 199                 for (i = 0, id = added & rxq_ptr_mask;
 200                      i < RTE_DIM(mbuf_blocks);
 201                      ++i, ++id) {
 202                         struct rte_mbuf *m = mbuf_blocks[i];
 203                         struct sfc_ef10_essb_rx_sw_desc *rxd;
 204
 205                         SFC_ASSERT((id & ~rxq_ptr_mask) == 0);
 206                         rxd = &rxq->sw_ring[id];
 207                         rxd->first_mbuf = m;
 208
 209                         /* RX_KER_BYTE_CNT is ignored by firmware */
 210                         EFX_POPULATE_QWORD_2(rxq->rxq_hw_ring[id],
 211                                              ESF_DZ_RX_KER_BYTE_CNT,
 212                                              SFC_EF10_ESSB_RX_FAKE_BUF_SIZE,
 213                                              ESF_DZ_RX_KER_BUF_ADDR,
 214                                              rte_mbuf_data_iova_default(m));
 215                 }
 216
 217                 added += RTE_DIM(mbuf_blocks);
 218
 219         } while (--bulks > 0);
 220
 221         SFC_ASSERT(rxq->added != added);
 222         rxq->added = added;
 223         sfc_ef10_rx_qpush(rxq->doorbell, added, rxq_ptr_mask,
 224                           &rxq->dp.dpq.dbells);
 225 }
 226
 227 static bool
 228 sfc_ef10_essb_rx_event_get(struct sfc_ef10_essb_rxq *rxq, efx_qword_t *rx_ev)
 229 {
 230         *rx_ev = rxq->evq_hw_ring[rxq->evq_read_ptr & rxq->evq_ptr_mask];
 231
 232         if (!sfc_ef10_ev_present(*rx_ev))
 233                 return false;
 234
 235         if (unlikely(EFX_QWORD_FIELD(*rx_ev, FSF_AZ_EV_CODE) !=
 236                      FSE_AZ_EV_CODE_RX_EV)) {
 237                 /*
 238                  * Do not move read_ptr to keep the event for exception
 239                  * handling
 240                  */
 241                 rxq->flags |= SFC_EF10_ESSB_RXQ_EXCEPTION;
 242                 sfc_ef10_essb_rx_err(&rxq->dp.dpq,
 243                                      "RxQ exception at EvQ read ptr %#x",
 244                                      rxq->evq_read_ptr);
 245                 return false;
 246         }
 247
 248         rxq->evq_read_ptr++;
 249         return true;
 250 }
 251
 252 static void
 253 sfc_ef10_essb_rx_process_ev(struct sfc_ef10_essb_rxq *rxq, efx_qword_t rx_ev)
 254 {
 255         unsigned int ready;
 256
 257         ready = (EFX_QWORD_FIELD(rx_ev, ESF_DZ_RX_DSC_PTR_LBITS) -
 258                  rxq->bufs_ptr) &
 259                 EFX_MASK32(ESF_DZ_RX_DSC_PTR_LBITS);
 260
 261         rxq->bufs_ptr += ready;
 262         rxq->bufs_pending += ready;
 263
 264         SFC_ASSERT(ready > 0);
 265         do {
 266                 const struct sfc_ef10_essb_rx_sw_desc *rxd;
 267                 struct rte_mbuf *m;
 268                 unsigned int todo_bufs;
 269                 struct rte_mbuf *m0;
 270
 271                 rxd = &rxq->sw_ring[rxq->pending_id];
 272                 m = sfc_ef10_essb_mbuf_by_index(rxq, rxd->first_mbuf,
 273                         rxq->block_size - rxq->left_in_pending);
 274
 275                 if (ready < rxq->left_in_pending) {
 276                         todo_bufs = ready;
 277                         ready = 0;
 278                         rxq->left_in_pending -= todo_bufs;
 279                 } else {
 280                         todo_bufs = rxq->left_in_pending;
 281                         ready -= todo_bufs;
 282                         rxq->left_in_pending = rxq->block_size;
 283                         if (rxq->pending_id != rxq->rxq_ptr_mask)
 284                                 rxq->pending_id++;
 285                         else
 286                                 rxq->pending_id = 0;
 287                 }
 288
 289                 SFC_ASSERT(todo_bufs > 0);
 290                 --todo_bufs;
 291
 292                 sfc_ef10_rx_ev_to_offloads(rx_ev, m, ~0ull);
 293
 294                 /* Prefetch pseudo-header */
 295                 rte_prefetch0((uint8_t *)m->buf_addr + RTE_PKTMBUF_HEADROOM);
 296
 297                 m0 = m;
 298                 while (todo_bufs-- > 0) {
 299                         m = sfc_ef10_essb_next_mbuf(rxq, m);
 300                         m->ol_flags = m0->ol_flags;
 301                         m->packet_type = m0->packet_type;
 302                         /* Prefetch pseudo-header */
 303                         rte_prefetch0((uint8_t *)m->buf_addr +
 304                                       RTE_PKTMBUF_HEADROOM);
 305                 }
 306         } while (ready > 0);
 307 }
 308
 309 /*
 310  * Below function relies on the following length and layout of the
 311  * Rx prefix.
 312  */
 313 static const efx_rx_prefix_layout_t sfc_ef10_essb_rx_prefix_layout = {
 314         .erpl_length    = ES_EZ_ESSB_RX_PREFIX_LEN,
 315         .erpl_fields    = {
 316 #define SFC_EF10_ESSB_RX_PREFIX_FIELD(_efx, _ef10) \
 317         EFX_RX_PREFIX_FIELD(_efx, ES_EZ_ESSB_RX_PREFIX_ ## _ef10, B_FALSE)
 318
 319                 SFC_EF10_ESSB_RX_PREFIX_FIELD(LENGTH, DATA_LEN),
 320                 SFC_EF10_ESSB_RX_PREFIX_FIELD(USER_MARK, MARK),
 321                 SFC_EF10_ESSB_RX_PREFIX_FIELD(RSS_HASH_VALID, HASH_VALID),
 322                 SFC_EF10_ESSB_RX_PREFIX_FIELD(USER_MARK_VALID, MARK_VALID),
 323                 SFC_EF10_ESSB_RX_PREFIX_FIELD(USER_FLAG, MATCH_FLAG),
 324                 SFC_EF10_ESSB_RX_PREFIX_FIELD(RSS_HASH, HASH),
 325
 326 #undef  SFC_EF10_ESSB_RX_PREFIX_FIELD
 327         }
 328 };
 329
 330 static unsigned int
 331 sfc_ef10_essb_rx_get_pending(struct sfc_ef10_essb_rxq *rxq,
 332                              struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 333 {
 334         unsigned int n_rx_pkts = 0;
 335         unsigned int todo_bufs;
 336         struct rte_mbuf *m;
 337
 338         while ((todo_bufs = RTE_MIN(nb_pkts - n_rx_pkts,
 339                                     rxq->bufs_pending)) > 0) {
 340                 m = sfc_ef10_essb_maybe_next_completed(rxq);
 341
 342                 todo_bufs = RTE_MIN(todo_bufs, rxq->left_in_completed);
 343
 344                 rxq->bufs_pending -= todo_bufs;
 345                 rxq->left_in_completed -= todo_bufs;
 346
 347                 SFC_ASSERT(todo_bufs > 0);
 348                 todo_bufs--;
 349
 350                 do {
 351                         const efx_qword_t *qwordp;
 352                         uint16_t pkt_len;
 353
 354                         /* Buffers to be discarded have 0 in packet type */
 355                         if (unlikely(m->packet_type == 0)) {
 356                                 rte_mbuf_raw_free(m);
 357                                 goto next_buf;
 358                         }
 359
 360                         rx_pkts[n_rx_pkts++] = m;
 361
 362                         /* Parse pseudo-header */
 363                         qwordp = (const efx_qword_t *)
 364                                 ((uint8_t *)m->buf_addr + RTE_PKTMBUF_HEADROOM);
 365                         pkt_len =
 366                                 EFX_QWORD_FIELD(*qwordp,
 367                                                 ES_EZ_ESSB_RX_PREFIX_DATA_LEN);
 368
 369                         m->data_off = RTE_PKTMBUF_HEADROOM +
 370                                 ES_EZ_ESSB_RX_PREFIX_LEN;
 371                         m->port = rxq->port_id;
 372
 373                         rte_pktmbuf_pkt_len(m) = pkt_len;
 374                         rte_pktmbuf_data_len(m) = pkt_len;
 375
 376                         m->ol_flags |=
 377                                 (RTE_MBUF_F_RX_RSS_HASH *
 378                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 379                                         ES_EZ_ESSB_RX_PREFIX_HASH_VALID_LBN)) |
 380                                 (RTE_MBUF_F_RX_FDIR_ID *
 381                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 382                                         ES_EZ_ESSB_RX_PREFIX_MARK_VALID_LBN)) |
 383                                 (RTE_MBUF_F_RX_FDIR *
 384                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 385                                         ES_EZ_ESSB_RX_PREFIX_MATCH_FLAG_LBN));
 386
 387                         /* EFX_QWORD_FIELD converts little-endian to CPU */
 388                         m->hash.rss =
 389                                 EFX_QWORD_FIELD(*qwordp,
 390                                                 ES_EZ_ESSB_RX_PREFIX_HASH);
 391                         m->hash.fdir.hi =
 392                                 EFX_QWORD_FIELD(*qwordp,
 393                                                 ES_EZ_ESSB_RX_PREFIX_MARK);
 394
 395 next_buf:
 396                         m = sfc_ef10_essb_next_mbuf(rxq, m);
 397                 } while (todo_bufs-- > 0);
 398         }
 399
 400         return n_rx_pkts;
 401 }
 402
 403
 404 static uint16_t
 405 sfc_ef10_essb_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 406                         uint16_t nb_pkts)
 407 {
 408         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(rx_queue);
 409         const unsigned int evq_old_read_ptr = rxq->evq_read_ptr;
 410         uint16_t n_rx_pkts;
 411         efx_qword_t rx_ev;
 412
 413         if (unlikely(rxq->flags & (SFC_EF10_ESSB_RXQ_NOT_RUNNING |
 414                                    SFC_EF10_ESSB_RXQ_EXCEPTION)))
 415                 return 0;
 416
 417         n_rx_pkts = sfc_ef10_essb_rx_get_pending(rxq, rx_pkts, nb_pkts);
 418
 419         while (n_rx_pkts != nb_pkts &&
 420                sfc_ef10_essb_rx_event_get(rxq, &rx_ev)) {
 421                 /*
 422                  * DROP_EVENT is an internal to the NIC, software should
 423                  * never see it and, therefore, may ignore it.
 424                  */
 425
 426                 sfc_ef10_essb_rx_process_ev(rxq, rx_ev);
 427                 n_rx_pkts += sfc_ef10_essb_rx_get_pending(rxq,
 428                                                           rx_pkts + n_rx_pkts,
 429                                                           nb_pkts - n_rx_pkts);
 430         }
 431
 432         sfc_ef10_ev_qclear(rxq->evq_hw_ring, rxq->evq_ptr_mask,
 433                            evq_old_read_ptr, rxq->evq_read_ptr);
 434
 435         /* It is not a problem if we refill in the case of exception */
 436         sfc_ef10_essb_rx_qrefill(rxq);
 437
 438         return n_rx_pkts;
 439 }
 440
 441 static sfc_dp_rx_qdesc_npending_t sfc_ef10_essb_rx_qdesc_npending;
 442 static unsigned int
 443 sfc_ef10_essb_rx_qdesc_npending(struct sfc_dp_rxq *dp_rxq)
 444 {
 445         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 446         const unsigned int evq_old_read_ptr = rxq->evq_read_ptr;
 447         efx_qword_t rx_ev;
 448
 449         if (unlikely(rxq->flags & (SFC_EF10_ESSB_RXQ_NOT_RUNNING |
 450                                    SFC_EF10_ESSB_RXQ_EXCEPTION)))
 451                 return rxq->bufs_pending;
 452
 453         while (sfc_ef10_essb_rx_event_get(rxq, &rx_ev)) {
 454                 /*
 455                  * DROP_EVENT is an internal to the NIC, software should
 456                  * never see it and, therefore, may ignore it.
 457                  */
 458                 sfc_ef10_essb_rx_process_ev(rxq, rx_ev);
 459         }
 460
 461         sfc_ef10_ev_qclear(rxq->evq_hw_ring, rxq->evq_ptr_mask,
 462                            evq_old_read_ptr, rxq->evq_read_ptr);
 463
 464         return rxq->bufs_pending;
 465 }
 466
 467 static sfc_dp_rx_qdesc_status_t sfc_ef10_essb_rx_qdesc_status;
 468 static int
 469 sfc_ef10_essb_rx_qdesc_status(struct sfc_dp_rxq *dp_rxq, uint16_t offset)
 470 {
 471         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 472         unsigned int pending = sfc_ef10_essb_rx_qdesc_npending(dp_rxq);
 473
 474         if (offset < pending)
 475                 return RTE_ETH_RX_DESC_DONE;
 476
 477         if (offset < (rxq->added - rxq->completed) * rxq->block_size +
 478                      rxq->left_in_completed - rxq->block_size)
 479                 return RTE_ETH_RX_DESC_AVAIL;
 480
 481         return RTE_ETH_RX_DESC_UNAVAIL;
 482 }
 483
 484 static sfc_dp_rx_get_dev_info_t sfc_ef10_essb_rx_get_dev_info;
 485 static void
 486 sfc_ef10_essb_rx_get_dev_info(struct rte_eth_dev_info *dev_info)
 487 {
 488         /*
 489          * Number of descriptors just defines maximum number of pushed
 490          * descriptors (fill level).
 491          */
 492         dev_info->rx_desc_lim.nb_min = SFC_EF10_ESSB_RX_DESCS_MIN;
 493         dev_info->rx_desc_lim.nb_align = SFC_EF10_ESSB_RX_DESCS_ALIGN;
 494 }
 495
 496 static sfc_dp_rx_pool_ops_supported_t sfc_ef10_essb_rx_pool_ops_supported;
 497 static int
 498 sfc_ef10_essb_rx_pool_ops_supported(const char *pool)
 499 {
 500         SFC_ASSERT(pool != NULL);
 501
 502         if (strcmp(pool, "bucket") == 0)
 503                 return 0;
 504
 505         return -ENOTSUP;
 506 }
 507
 508 static sfc_dp_rx_qsize_up_rings_t sfc_ef10_essb_rx_qsize_up_rings;
 509 static int
 510 sfc_ef10_essb_rx_qsize_up_rings(uint16_t nb_rx_desc,
 511                                 struct sfc_dp_rx_hw_limits *limits,
 512                                 struct rte_mempool *mb_pool,
 513                                 unsigned int *rxq_entries,
 514                                 unsigned int *evq_entries,
 515                                 unsigned int *rxq_max_fill_level)
 516 {
 517         int rc;
 518         struct rte_mempool_info mp_info;
 519         unsigned int nb_hw_rx_desc;
 520         unsigned int max_events;
 521
 522         rc = rte_mempool_ops_get_info(mb_pool, &mp_info);
 523         if (rc != 0)
 524                 return -rc;
 525         if (mp_info.contig_block_size == 0)
 526                 return EINVAL;
 527
 528         /*
 529          * Calculate required number of hardware Rx descriptors each
 530          * carrying contig block size Rx buffers.
 531          * It cannot be less than Rx write pointer alignment plus 1
 532          * in order to avoid cases when the ring is guaranteed to be
 533          * empty.
 534          */
 535         nb_hw_rx_desc = RTE_MAX(SFC_DIV_ROUND_UP(nb_rx_desc,
 536                                                  mp_info.contig_block_size),
 537                                 SFC_EF10_RX_WPTR_ALIGN + 1);
 538         if (nb_hw_rx_desc <= limits->rxq_min_entries) {
 539                 *rxq_entries = limits->rxq_min_entries;
 540         } else {
 541                 *rxq_entries = rte_align32pow2(nb_hw_rx_desc);
 542                 if (*rxq_entries > limits->rxq_max_entries)
 543                         return EINVAL;
 544         }
 545
 546         max_events = RTE_ALIGN_FLOOR(nb_hw_rx_desc, SFC_EF10_RX_WPTR_ALIGN) *
 547                 mp_info.contig_block_size +
 548                 (SFC_EF10_EV_PER_CACHE_LINE - 1) /* max unused EvQ entries */ +
 549                 1 /* Rx error */ + 1 /* flush */ + 1 /* head-tail space */;
 550
 551         *evq_entries = rte_align32pow2(max_events);
 552         *evq_entries = RTE_MAX(*evq_entries, limits->evq_min_entries);
 553         *evq_entries = RTE_MIN(*evq_entries, limits->evq_max_entries);
 554
 555         /*
 556          * May be even maximum event queue size is insufficient to handle
 557          * so many Rx descriptors. If so, we should limit Rx queue fill level.
 558          */
 559         *rxq_max_fill_level = RTE_MIN(nb_rx_desc,
 560                                       SFC_EF10_ESSB_RXQ_LIMIT(*evq_entries));
 561         return 0;
 562 }
 563
 564 static sfc_dp_rx_qcreate_t sfc_ef10_essb_rx_qcreate;
 565 static int
 566 sfc_ef10_essb_rx_qcreate(uint16_t port_id, uint16_t queue_id,
 567                          const struct rte_pci_addr *pci_addr, int socket_id,
 568                          const struct sfc_dp_rx_qcreate_info *info,
 569                          struct sfc_dp_rxq **dp_rxqp)
 570 {
 571         struct rte_mempool * const mp = info->refill_mb_pool;
 572         struct rte_mempool_info mp_info;
 573         struct sfc_ef10_essb_rxq *rxq;
 574         int rc;
 575
 576         rc = rte_mempool_ops_get_info(mp, &mp_info);
 577         if (rc != 0) {
 578                 /* Positive errno is used in the driver */
 579                 rc = -rc;
 580                 goto fail_get_contig_block_size;
 581         }
 582
 583         /* Check if the mempool provides block dequeue */
 584         rc = EINVAL;
 585         if (mp_info.contig_block_size == 0)
 586                 goto fail_no_block_dequeue;
 587
 588         rc = ENOMEM;
 589         rxq = rte_zmalloc_socket("sfc-ef10-rxq", sizeof(*rxq),
 590                                  RTE_CACHE_LINE_SIZE, socket_id);
 591         if (rxq == NULL)
 592                 goto fail_rxq_alloc;
 593
 594         sfc_dp_queue_init(&rxq->dp.dpq, port_id, queue_id, pci_addr);
 595
 596         rc = ENOMEM;
 597         rxq->sw_ring = rte_calloc_socket("sfc-ef10-rxq-sw_ring",
 598                                          info->rxq_entries,
 599                                          sizeof(*rxq->sw_ring),
 600                                          RTE_CACHE_LINE_SIZE, socket_id);
 601         if (rxq->sw_ring == NULL)
 602                 goto fail_desc_alloc;
 603
 604         rxq->block_size = mp_info.contig_block_size;
 605         rxq->buf_stride = mp->header_size + mp->elt_size + mp->trailer_size;
 606         rxq->rxq_ptr_mask = info->rxq_entries - 1;
 607         rxq->evq_ptr_mask = info->evq_entries - 1;
 608         rxq->evq_hw_ring = info->evq_hw_ring;
 609         rxq->port_id = port_id;
 610
 611         rxq->max_fill_level = info->max_fill_level / mp_info.contig_block_size;
 612         rxq->refill_threshold =
 613                 RTE_MAX(info->refill_threshold / mp_info.contig_block_size,
 614                         SFC_EF10_RX_WPTR_ALIGN);
 615         rxq->refill_mb_pool = mp;
 616         rxq->rxq_hw_ring = info->rxq_hw_ring;
 617
 618         rxq->doorbell = (volatile uint8_t *)info->mem_bar +
 619                         ER_DZ_RX_DESC_UPD_REG_OFST +
 620                         (info->hw_index << info->vi_window_shift);
 621
 622         sfc_ef10_essb_rx_info(&rxq->dp.dpq, "RxQ doorbell is %p",
 623                               rxq->doorbell);
 624         sfc_ef10_essb_rx_info(&rxq->dp.dpq,
 625                               "block size is %u, buf stride is %u",
 626                               rxq->block_size, rxq->buf_stride);
 627         sfc_ef10_essb_rx_info(&rxq->dp.dpq,
 628                               "max fill level is %u descs (%u bufs), "
 629                               "refill threashold %u descs (%u bufs)",
 630                               rxq->max_fill_level,
 631                               rxq->max_fill_level * rxq->block_size,
 632                               rxq->refill_threshold,
 633                               rxq->refill_threshold * rxq->block_size);
 634
 635         *dp_rxqp = &rxq->dp;
 636         return 0;
 637
 638 fail_desc_alloc:
 639         rte_free(rxq);
 640
 641 fail_rxq_alloc:
 642 fail_no_block_dequeue:
 643 fail_get_contig_block_size:
 644         return rc;
 645 }
 646
 647 static sfc_dp_rx_qdestroy_t sfc_ef10_essb_rx_qdestroy;
 648 static void
 649 sfc_ef10_essb_rx_qdestroy(struct sfc_dp_rxq *dp_rxq)
 650 {
 651         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 652
 653         rte_free(rxq->sw_ring);
 654         rte_free(rxq);
 655 }
 656
 657 static sfc_dp_rx_qstart_t sfc_ef10_essb_rx_qstart;
 658 static int
 659 sfc_ef10_essb_rx_qstart(struct sfc_dp_rxq *dp_rxq, unsigned int evq_read_ptr,
 660                         const efx_rx_prefix_layout_t *pinfo)
 661 {
 662         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 663
 664         if (pinfo->erpl_length != sfc_ef10_essb_rx_prefix_layout.erpl_length)
 665                 return ENOTSUP;
 666
 667         if (efx_rx_prefix_layout_check(pinfo,
 668                                        &sfc_ef10_essb_rx_prefix_layout) != 0)
 669                 return ENOTSUP;
 670
 671         rxq->evq_read_ptr = evq_read_ptr;
 672
 673         /* Initialize before refill */
 674         rxq->completed = rxq->pending_id = rxq->added = 0;
 675         rxq->left_in_completed = rxq->left_in_pending = rxq->block_size;
 676         rxq->bufs_ptr = UINT_MAX;
 677         rxq->bufs_pending = 0;
 678
 679         sfc_ef10_essb_rx_qrefill(rxq);
 680
 681         rxq->flags |= SFC_EF10_ESSB_RXQ_STARTED;
 682         rxq->flags &=
 683                 ~(SFC_EF10_ESSB_RXQ_NOT_RUNNING | SFC_EF10_ESSB_RXQ_EXCEPTION);
 684
 685         return 0;
 686 }
 687
 688 static sfc_dp_rx_qstop_t sfc_ef10_essb_rx_qstop;
 689 static void
 690 sfc_ef10_essb_rx_qstop(struct sfc_dp_rxq *dp_rxq, unsigned int *evq_read_ptr)
 691 {
 692         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 693
 694         rxq->flags |= SFC_EF10_ESSB_RXQ_NOT_RUNNING;
 695
 696         *evq_read_ptr = rxq->evq_read_ptr;
 697 }
 698
 699 static sfc_dp_rx_qrx_ev_t sfc_ef10_essb_rx_qrx_ev;
 700 static bool
 701 sfc_ef10_essb_rx_qrx_ev(struct sfc_dp_rxq *dp_rxq, __rte_unused unsigned int id)
 702 {
 703         __rte_unused struct sfc_ef10_essb_rxq *rxq;
 704
 705         rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 706         SFC_ASSERT(rxq->flags & SFC_EF10_ESSB_RXQ_NOT_RUNNING);
 707
 708         /*
 709          * It is safe to ignore Rx event since we free all mbufs on
 710          * queue purge anyway.
 711          */
 712
 713         return false;
 714 }
 715
 716 static sfc_dp_rx_qpurge_t sfc_ef10_essb_rx_qpurge;
 717 static void
 718 sfc_ef10_essb_rx_qpurge(struct sfc_dp_rxq *dp_rxq)
 719 {
 720         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 721         unsigned int i;
 722         const struct sfc_ef10_essb_rx_sw_desc *rxd;
 723         struct rte_mbuf *m;
 724
 725         for (i = rxq->completed; i != rxq->added; ++i) {
 726                 rxd = &rxq->sw_ring[i & rxq->rxq_ptr_mask];
 727                 m = sfc_ef10_essb_mbuf_by_index(rxq, rxd->first_mbuf,
 728                                 rxq->block_size - rxq->left_in_completed);
 729                 while (rxq->left_in_completed > 0) {
 730                         rte_mbuf_raw_free(m);
 731                         m = sfc_ef10_essb_next_mbuf(rxq, m);
 732                         rxq->left_in_completed--;
 733                 }
 734                 rxq->left_in_completed = rxq->block_size;
 735         }
 736
 737         rxq->flags &= ~SFC_EF10_ESSB_RXQ_STARTED;
 738 }
 739
 740 struct sfc_dp_rx sfc_ef10_essb_rx = {
 741         .dp = {
 742                 .name           = SFC_KVARG_DATAPATH_EF10_ESSB,
 743                 .type           = SFC_DP_RX,
 744                 .hw_fw_caps     = SFC_DP_HW_FW_CAP_EF10 |
 745                                   SFC_DP_HW_FW_CAP_RX_ES_SUPER_BUFFER,
 746         },
 747         .features               = SFC_DP_RX_FEAT_FLOW_FLAG |
 748                                   SFC_DP_RX_FEAT_FLOW_MARK,
 749         .dev_offload_capa       = RTE_ETH_RX_OFFLOAD_CHECKSUM |
 750                                   RTE_ETH_RX_OFFLOAD_RSS_HASH,
 751         .queue_offload_capa     = 0,
 752         .get_dev_info           = sfc_ef10_essb_rx_get_dev_info,
 753         .pool_ops_supported     = sfc_ef10_essb_rx_pool_ops_supported,
 754         .qsize_up_rings         = sfc_ef10_essb_rx_qsize_up_rings,
 755         .qcreate                = sfc_ef10_essb_rx_qcreate,
 756         .qdestroy               = sfc_ef10_essb_rx_qdestroy,
 757         .qstart                 = sfc_ef10_essb_rx_qstart,
 758         .qstop                  = sfc_ef10_essb_rx_qstop,
 759         .qrx_ev                 = sfc_ef10_essb_rx_qrx_ev,
 760         .qpurge                 = sfc_ef10_essb_rx_qpurge,
 761         .supported_ptypes_get   = sfc_ef10_supported_ptypes_get,
 762         .qdesc_npending         = sfc_ef10_essb_rx_qdesc_npending,
 763         .qdesc_status           = sfc_ef10_essb_rx_qdesc_status,
 764         .pkt_burst              = sfc_ef10_essb_recv_pkts,
 765 };