drivers/net/sfc/sfc_ef10_essb_rx.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  *
   3  * Copyright(c) 2019-2020 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_ptype.h>
  16 #include <rte_mbuf.h>
  17 #include <rte_io.h>
  18
  19 #include "efx.h"
  20 #include "efx_types.h"
  21 #include "efx_regs.h"
  22 #include "efx_regs_ef10.h"
  23
  24 #include "sfc_tweak.h"
  25 #include "sfc_dp_rx.h"
  26 #include "sfc_kvargs.h"
  27 #include "sfc_ef10.h"
  28
  29 /* Tunnels are not supported */
  30 #define SFC_EF10_RX_EV_ENCAP_SUPPORT    0
  31 #include "sfc_ef10_rx_ev.h"
  32
  33 #define sfc_ef10_essb_rx_err(dpq, ...) \
  34         SFC_DP_LOG(SFC_KVARG_DATAPATH_EF10_ESSB, ERR, dpq, __VA_ARGS__)
  35
  36 #define sfc_ef10_essb_rx_info(dpq, ...) \
  37         SFC_DP_LOG(SFC_KVARG_DATAPATH_EF10_ESSB, INFO, dpq, __VA_ARGS__)
  38
  39 /*
  40  * Fake length for RXQ descriptors in equal stride super-buffer mode
  41  * to make hardware happy.
  42  */
  43 #define SFC_EF10_ESSB_RX_FAKE_BUF_SIZE  32
  44
  45 /**
  46  * Minimum number of Rx buffers the datapath allows to use.
  47  *
  48  * Each HW Rx descriptor has many Rx buffers. The number of buffers
  49  * in one HW Rx descriptor is equal to size of contiguous block
  50  * provided by Rx buffers memory pool. The contiguous block size
  51  * depends on CONFIG_RTE_DRIVER_MEMPOOL_BUCKET_SIZE_KB and rte_mbuf
  52  * data size specified on the memory pool creation. Typical rte_mbuf
  53  * data size is about 2k which makes a bit less than 32 buffers in
  54  * contiguous block with default bucket size equal to 64k.
  55  * Since HW Rx descriptors are pushed by 8 (see SFC_EF10_RX_WPTR_ALIGN),
  56  * it makes about 256 as required minimum. Double it in advertised
  57  * minimum to allow for at least 2 refill blocks.
  58  */
  59 #define SFC_EF10_ESSB_RX_DESCS_MIN      512
  60
  61 /**
  62  * Number of Rx buffers should be aligned to.
  63  *
  64  * There are no extra requirements on alignment since actual number of
  65  * pushed Rx buffers will be multiple by contiguous block size which
  66  * is unknown beforehand.
  67  */
  68 #define SFC_EF10_ESSB_RX_DESCS_ALIGN    1
  69
  70 /**
  71  * Maximum number of descriptors/buffers in the Rx ring.
  72  * It should guarantee that corresponding event queue never overfill.
  73  */
  74 #define SFC_EF10_ESSB_RXQ_LIMIT(_nevs) \
  75         ((_nevs) - 1 /* head must not step on tail */ - \
  76          (SFC_EF10_EV_PER_CACHE_LINE - 1) /* max unused EvQ entries */ - \
  77          1 /* Rx error */ - 1 /* flush */)
  78
  79 struct sfc_ef10_essb_rx_sw_desc {
  80         struct rte_mbuf                 *first_mbuf;
  81 };
  82
  83 struct sfc_ef10_essb_rxq {
  84         /* Used on data path */
  85         unsigned int                    flags;
  86 #define SFC_EF10_ESSB_RXQ_STARTED       0x1
  87 #define SFC_EF10_ESSB_RXQ_NOT_RUNNING   0x2
  88 #define SFC_EF10_ESSB_RXQ_EXCEPTION     0x4
  89         unsigned int                    rxq_ptr_mask;
  90         unsigned int                    block_size;
  91         unsigned int                    buf_stride;
  92         unsigned int                    bufs_ptr;
  93         unsigned int                    completed;
  94         unsigned int                    pending_id;
  95         unsigned int                    bufs_pending;
  96         unsigned int                    left_in_completed;
  97         unsigned int                    left_in_pending;
  98         unsigned int                    evq_read_ptr;
  99         unsigned int                    evq_ptr_mask;
 100         efx_qword_t                     *evq_hw_ring;
 101         struct sfc_ef10_essb_rx_sw_desc *sw_ring;
 102         uint16_t                        port_id;
 103
 104         /* Used on refill */
 105         unsigned int                    added;
 106         unsigned int                    max_fill_level;
 107         unsigned int                    refill_threshold;
 108         struct rte_mempool              *refill_mb_pool;
 109         efx_qword_t                     *rxq_hw_ring;
 110         volatile void                   *doorbell;
 111
 112         /* Datapath receive queue anchor */
 113         struct sfc_dp_rxq               dp;
 114 };
 115
 116 static inline struct sfc_ef10_essb_rxq *
 117 sfc_ef10_essb_rxq_by_dp_rxq(struct sfc_dp_rxq *dp_rxq)
 118 {
 119         return container_of(dp_rxq, struct sfc_ef10_essb_rxq, dp);
 120 }
 121
 122 static struct rte_mbuf *
 123 sfc_ef10_essb_next_mbuf(const struct sfc_ef10_essb_rxq *rxq,
 124                         struct rte_mbuf *mbuf)
 125 {
 126         struct rte_mbuf *m;
 127
 128         m = (struct rte_mbuf *)((uintptr_t)mbuf + rxq->buf_stride);
 129         MBUF_RAW_ALLOC_CHECK(m);
 130         return m;
 131 }
 132
 133 static struct rte_mbuf *
 134 sfc_ef10_essb_mbuf_by_index(const struct sfc_ef10_essb_rxq *rxq,
 135                             struct rte_mbuf *mbuf, unsigned int idx)
 136 {
 137         struct rte_mbuf *m;
 138
 139         m = (struct rte_mbuf *)((uintptr_t)mbuf + idx * rxq->buf_stride);
 140         MBUF_RAW_ALLOC_CHECK(m);
 141         return m;
 142 }
 143
 144 static struct rte_mbuf *
 145 sfc_ef10_essb_maybe_next_completed(struct sfc_ef10_essb_rxq *rxq)
 146 {
 147         const struct sfc_ef10_essb_rx_sw_desc *rxd;
 148
 149         if (rxq->left_in_completed != 0) {
 150                 rxd = &rxq->sw_ring[rxq->completed & rxq->rxq_ptr_mask];
 151                 return sfc_ef10_essb_mbuf_by_index(rxq, rxd->first_mbuf,
 152                                 rxq->block_size - rxq->left_in_completed);
 153         } else {
 154                 rxq->completed++;
 155                 rxd = &rxq->sw_ring[rxq->completed & rxq->rxq_ptr_mask];
 156                 rxq->left_in_completed = rxq->block_size;
 157                 return rxd->first_mbuf;
 158         }
 159 }
 160
 161 static void
 162 sfc_ef10_essb_rx_qrefill(struct sfc_ef10_essb_rxq *rxq)
 163 {
 164         const unsigned int rxq_ptr_mask = rxq->rxq_ptr_mask;
 165         unsigned int free_space;
 166         unsigned int bulks;
 167         void *mbuf_blocks[SFC_EF10_RX_WPTR_ALIGN];
 168         unsigned int added = rxq->added;
 169
 170         free_space = rxq->max_fill_level - (added - rxq->completed);
 171
 172         if (free_space < rxq->refill_threshold)
 173                 return;
 174
 175         bulks = free_space / RTE_DIM(mbuf_blocks);
 176         /* refill_threshold guarantees that bulks is positive */
 177         SFC_ASSERT(bulks > 0);
 178
 179         do {
 180                 unsigned int id;
 181                 unsigned int i;
 182
 183                 if (unlikely(rte_mempool_get_contig_blocks(rxq->refill_mb_pool,
 184                                 mbuf_blocks, RTE_DIM(mbuf_blocks)) < 0)) {
 185                         struct rte_eth_dev_data *dev_data =
 186                                 rte_eth_devices[rxq->port_id].data;
 187
 188                         /*
 189                          * It is hardly a safe way to increment counter
 190                          * from different contexts, but all PMDs do it.
 191                          */
 192                         dev_data->rx_mbuf_alloc_failed += RTE_DIM(mbuf_blocks);
 193                         /* Return if we have posted nothing yet */
 194                         if (added == rxq->added)
 195                                 return;
 196                         /* Push posted */
 197                         break;
 198                 }
 199
 200                 for (i = 0, id = added & rxq_ptr_mask;
 201                      i < RTE_DIM(mbuf_blocks);
 202                      ++i, ++id) {
 203                         struct rte_mbuf *m = mbuf_blocks[i];
 204                         struct sfc_ef10_essb_rx_sw_desc *rxd;
 205
 206                         SFC_ASSERT((id & ~rxq_ptr_mask) == 0);
 207                         rxd = &rxq->sw_ring[id];
 208                         rxd->first_mbuf = m;
 209
 210                         /* RX_KER_BYTE_CNT is ignored by firmware */
 211                         EFX_POPULATE_QWORD_2(rxq->rxq_hw_ring[id],
 212                                              ESF_DZ_RX_KER_BYTE_CNT,
 213                                              SFC_EF10_ESSB_RX_FAKE_BUF_SIZE,
 214                                              ESF_DZ_RX_KER_BUF_ADDR,
 215                                              rte_mbuf_data_iova_default(m));
 216                 }
 217
 218                 added += RTE_DIM(mbuf_blocks);
 219
 220         } while (--bulks > 0);
 221
 222         SFC_ASSERT(rxq->added != added);
 223         rxq->added = added;
 224         sfc_ef10_rx_qpush(rxq->doorbell, added, rxq_ptr_mask);
 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 static unsigned int
 310 sfc_ef10_essb_rx_get_pending(struct sfc_ef10_essb_rxq *rxq,
 311                              struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 312 {
 313         unsigned int n_rx_pkts = 0;
 314         unsigned int todo_bufs;
 315         struct rte_mbuf *m;
 316
 317         while ((todo_bufs = RTE_MIN(nb_pkts - n_rx_pkts,
 318                                     rxq->bufs_pending)) > 0) {
 319                 m = sfc_ef10_essb_maybe_next_completed(rxq);
 320
 321                 todo_bufs = RTE_MIN(todo_bufs, rxq->left_in_completed);
 322
 323                 rxq->bufs_pending -= todo_bufs;
 324                 rxq->left_in_completed -= todo_bufs;
 325
 326                 SFC_ASSERT(todo_bufs > 0);
 327                 todo_bufs--;
 328
 329                 do {
 330                         const efx_qword_t *qwordp;
 331                         uint16_t pkt_len;
 332
 333                         /* Buffers to be discarded have 0 in packet type */
 334                         if (unlikely(m->packet_type == 0)) {
 335                                 rte_mbuf_raw_free(m);
 336                                 goto next_buf;
 337                         }
 338
 339                         rx_pkts[n_rx_pkts++] = m;
 340
 341                         /* Parse pseudo-header */
 342                         qwordp = (const efx_qword_t *)
 343                                 ((uint8_t *)m->buf_addr + RTE_PKTMBUF_HEADROOM);
 344                         pkt_len =
 345                                 EFX_QWORD_FIELD(*qwordp,
 346                                                 ES_EZ_ESSB_RX_PREFIX_DATA_LEN);
 347
 348                         m->data_off = RTE_PKTMBUF_HEADROOM +
 349                                 ES_EZ_ESSB_RX_PREFIX_LEN;
 350                         m->port = rxq->port_id;
 351
 352                         rte_pktmbuf_pkt_len(m) = pkt_len;
 353                         rte_pktmbuf_data_len(m) = pkt_len;
 354
 355                         m->ol_flags |=
 356                                 (PKT_RX_RSS_HASH *
 357                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 358                                         ES_EZ_ESSB_RX_PREFIX_HASH_VALID_LBN)) |
 359                                 (PKT_RX_FDIR_ID *
 360                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 361                                         ES_EZ_ESSB_RX_PREFIX_MARK_VALID_LBN)) |
 362                                 (PKT_RX_FDIR *
 363                                  !!EFX_TEST_QWORD_BIT(*qwordp,
 364                                         ES_EZ_ESSB_RX_PREFIX_MATCH_FLAG_LBN));
 365
 366                         /* EFX_QWORD_FIELD converts little-endian to CPU */
 367                         m->hash.rss =
 368                                 EFX_QWORD_FIELD(*qwordp,
 369                                                 ES_EZ_ESSB_RX_PREFIX_HASH);
 370                         m->hash.fdir.hi =
 371                                 EFX_QWORD_FIELD(*qwordp,
 372                                                 ES_EZ_ESSB_RX_PREFIX_MARK);
 373
 374 next_buf:
 375                         m = sfc_ef10_essb_next_mbuf(rxq, m);
 376                 } while (todo_bufs-- > 0);
 377         }
 378
 379         return n_rx_pkts;
 380 }
 381
 382
 383 static uint16_t
 384 sfc_ef10_essb_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 385                         uint16_t nb_pkts)
 386 {
 387         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(rx_queue);
 388         const unsigned int evq_old_read_ptr = rxq->evq_read_ptr;
 389         uint16_t n_rx_pkts;
 390         efx_qword_t rx_ev;
 391
 392         if (unlikely(rxq->flags & (SFC_EF10_ESSB_RXQ_NOT_RUNNING |
 393                                    SFC_EF10_ESSB_RXQ_EXCEPTION)))
 394                 return 0;
 395
 396         n_rx_pkts = sfc_ef10_essb_rx_get_pending(rxq, rx_pkts, nb_pkts);
 397
 398         while (n_rx_pkts != nb_pkts &&
 399                sfc_ef10_essb_rx_event_get(rxq, &rx_ev)) {
 400                 /*
 401                  * DROP_EVENT is an internal to the NIC, software should
 402                  * never see it and, therefore, may ignore it.
 403                  */
 404
 405                 sfc_ef10_essb_rx_process_ev(rxq, rx_ev);
 406                 n_rx_pkts += sfc_ef10_essb_rx_get_pending(rxq,
 407                                                           rx_pkts + n_rx_pkts,
 408                                                           nb_pkts - n_rx_pkts);
 409         }
 410
 411         sfc_ef10_ev_qclear(rxq->evq_hw_ring, rxq->evq_ptr_mask,
 412                            evq_old_read_ptr, rxq->evq_read_ptr);
 413
 414         /* It is not a problem if we refill in the case of exception */
 415         sfc_ef10_essb_rx_qrefill(rxq);
 416
 417         return n_rx_pkts;
 418 }
 419
 420 static sfc_dp_rx_qdesc_npending_t sfc_ef10_essb_rx_qdesc_npending;
 421 static unsigned int
 422 sfc_ef10_essb_rx_qdesc_npending(struct sfc_dp_rxq *dp_rxq)
 423 {
 424         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 425         const unsigned int evq_old_read_ptr = rxq->evq_read_ptr;
 426         efx_qword_t rx_ev;
 427
 428         if (unlikely(rxq->flags & (SFC_EF10_ESSB_RXQ_NOT_RUNNING |
 429                                    SFC_EF10_ESSB_RXQ_EXCEPTION)))
 430                 return rxq->bufs_pending;
 431
 432         while (sfc_ef10_essb_rx_event_get(rxq, &rx_ev)) {
 433                 /*
 434                  * DROP_EVENT is an internal to the NIC, software should
 435                  * never see it and, therefore, may ignore it.
 436                  */
 437                 sfc_ef10_essb_rx_process_ev(rxq, rx_ev);
 438         }
 439
 440         sfc_ef10_ev_qclear(rxq->evq_hw_ring, rxq->evq_ptr_mask,
 441                            evq_old_read_ptr, rxq->evq_read_ptr);
 442
 443         return rxq->bufs_pending;
 444 }
 445
 446 static sfc_dp_rx_qdesc_status_t sfc_ef10_essb_rx_qdesc_status;
 447 static int
 448 sfc_ef10_essb_rx_qdesc_status(struct sfc_dp_rxq *dp_rxq, uint16_t offset)
 449 {
 450         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 451         unsigned int pending = sfc_ef10_essb_rx_qdesc_npending(dp_rxq);
 452
 453         if (offset < pending)
 454                 return RTE_ETH_RX_DESC_DONE;
 455
 456         if (offset < (rxq->added - rxq->completed) * rxq->block_size +
 457                      rxq->left_in_completed - rxq->block_size)
 458                 return RTE_ETH_RX_DESC_AVAIL;
 459
 460         return RTE_ETH_RX_DESC_UNAVAIL;
 461 }
 462
 463 static sfc_dp_rx_get_dev_info_t sfc_ef10_essb_rx_get_dev_info;
 464 static void
 465 sfc_ef10_essb_rx_get_dev_info(struct rte_eth_dev_info *dev_info)
 466 {
 467         /*
 468          * Number of descriptors just defines maximum number of pushed
 469          * descriptors (fill level).
 470          */
 471         dev_info->rx_desc_lim.nb_min = SFC_EF10_ESSB_RX_DESCS_MIN;
 472         dev_info->rx_desc_lim.nb_align = SFC_EF10_ESSB_RX_DESCS_ALIGN;
 473 }
 474
 475 static sfc_dp_rx_pool_ops_supported_t sfc_ef10_essb_rx_pool_ops_supported;
 476 static int
 477 sfc_ef10_essb_rx_pool_ops_supported(const char *pool)
 478 {
 479         SFC_ASSERT(pool != NULL);
 480
 481         if (strcmp(pool, "bucket") == 0)
 482                 return 0;
 483
 484         return -ENOTSUP;
 485 }
 486
 487 static sfc_dp_rx_qsize_up_rings_t sfc_ef10_essb_rx_qsize_up_rings;
 488 static int
 489 sfc_ef10_essb_rx_qsize_up_rings(uint16_t nb_rx_desc,
 490                                 struct sfc_dp_rx_hw_limits *limits,
 491                                 struct rte_mempool *mb_pool,
 492                                 unsigned int *rxq_entries,
 493                                 unsigned int *evq_entries,
 494                                 unsigned int *rxq_max_fill_level)
 495 {
 496         int rc;
 497         struct rte_mempool_info mp_info;
 498         unsigned int nb_hw_rx_desc;
 499         unsigned int max_events;
 500
 501         rc = rte_mempool_ops_get_info(mb_pool, &mp_info);
 502         if (rc != 0)
 503                 return -rc;
 504         if (mp_info.contig_block_size == 0)
 505                 return EINVAL;
 506
 507         /*
 508          * Calculate required number of hardware Rx descriptors each
 509          * carrying contig block size Rx buffers.
 510          * It cannot be less than Rx write pointer alignment plus 1
 511          * in order to avoid cases when the ring is guaranteed to be
 512          * empty.
 513          */
 514         nb_hw_rx_desc = RTE_MAX(SFC_DIV_ROUND_UP(nb_rx_desc,
 515                                                  mp_info.contig_block_size),
 516                                 SFC_EF10_RX_WPTR_ALIGN + 1);
 517         if (nb_hw_rx_desc <= limits->rxq_min_entries) {
 518                 *rxq_entries = limits->rxq_min_entries;
 519         } else {
 520                 *rxq_entries = rte_align32pow2(nb_hw_rx_desc);
 521                 if (*rxq_entries > limits->rxq_max_entries)
 522                         return EINVAL;
 523         }
 524
 525         max_events = RTE_ALIGN_FLOOR(nb_hw_rx_desc, SFC_EF10_RX_WPTR_ALIGN) *
 526                 mp_info.contig_block_size +
 527                 (SFC_EF10_EV_PER_CACHE_LINE - 1) /* max unused EvQ entries */ +
 528                 1 /* Rx error */ + 1 /* flush */ + 1 /* head-tail space */;
 529
 530         *evq_entries = rte_align32pow2(max_events);
 531         *evq_entries = RTE_MAX(*evq_entries, limits->evq_min_entries);
 532         *evq_entries = RTE_MIN(*evq_entries, limits->evq_max_entries);
 533
 534         /*
 535          * May be even maximum event queue size is insufficient to handle
 536          * so many Rx descriptors. If so, we should limit Rx queue fill level.
 537          */
 538         *rxq_max_fill_level = RTE_MIN(nb_rx_desc,
 539                                       SFC_EF10_ESSB_RXQ_LIMIT(*evq_entries));
 540         return 0;
 541 }
 542
 543 static sfc_dp_rx_qcreate_t sfc_ef10_essb_rx_qcreate;
 544 static int
 545 sfc_ef10_essb_rx_qcreate(uint16_t port_id, uint16_t queue_id,
 546                          const struct rte_pci_addr *pci_addr, int socket_id,
 547                          const struct sfc_dp_rx_qcreate_info *info,
 548                          struct sfc_dp_rxq **dp_rxqp)
 549 {
 550         struct rte_mempool * const mp = info->refill_mb_pool;
 551         struct rte_mempool_info mp_info;
 552         struct sfc_ef10_essb_rxq *rxq;
 553         int rc;
 554
 555         rc = rte_mempool_ops_get_info(mp, &mp_info);
 556         if (rc != 0) {
 557                 /* Positive errno is used in the driver */
 558                 rc = -rc;
 559                 goto fail_get_contig_block_size;
 560         }
 561
 562         /* Check if the mempool provides block dequeue */
 563         rc = EINVAL;
 564         if (mp_info.contig_block_size == 0)
 565                 goto fail_no_block_dequeue;
 566
 567         rc = ENOMEM;
 568         rxq = rte_zmalloc_socket("sfc-ef10-rxq", sizeof(*rxq),
 569                                  RTE_CACHE_LINE_SIZE, socket_id);
 570         if (rxq == NULL)
 571                 goto fail_rxq_alloc;
 572
 573         sfc_dp_queue_init(&rxq->dp.dpq, port_id, queue_id, pci_addr);
 574
 575         rc = ENOMEM;
 576         rxq->sw_ring = rte_calloc_socket("sfc-ef10-rxq-sw_ring",
 577                                          info->rxq_entries,
 578                                          sizeof(*rxq->sw_ring),
 579                                          RTE_CACHE_LINE_SIZE, socket_id);
 580         if (rxq->sw_ring == NULL)
 581                 goto fail_desc_alloc;
 582
 583         rxq->block_size = mp_info.contig_block_size;
 584         rxq->buf_stride = mp->header_size + mp->elt_size + mp->trailer_size;
 585         rxq->rxq_ptr_mask = info->rxq_entries - 1;
 586         rxq->evq_ptr_mask = info->evq_entries - 1;
 587         rxq->evq_hw_ring = info->evq_hw_ring;
 588         rxq->port_id = port_id;
 589
 590         rxq->max_fill_level = info->max_fill_level / mp_info.contig_block_size;
 591         rxq->refill_threshold =
 592                 RTE_MAX(info->refill_threshold / mp_info.contig_block_size,
 593                         SFC_EF10_RX_WPTR_ALIGN);
 594         rxq->refill_mb_pool = mp;
 595         rxq->rxq_hw_ring = info->rxq_hw_ring;
 596
 597         rxq->doorbell = (volatile uint8_t *)info->mem_bar +
 598                         ER_DZ_RX_DESC_UPD_REG_OFST +
 599                         (info->hw_index << info->vi_window_shift);
 600
 601         sfc_ef10_essb_rx_info(&rxq->dp.dpq,
 602                               "block size is %u, buf stride is %u",
 603                               rxq->block_size, rxq->buf_stride);
 604         sfc_ef10_essb_rx_info(&rxq->dp.dpq,
 605                               "max fill level is %u descs (%u bufs), "
 606                               "refill threashold %u descs (%u bufs)",
 607                               rxq->max_fill_level,
 608                               rxq->max_fill_level * rxq->block_size,
 609                               rxq->refill_threshold,
 610                               rxq->refill_threshold * rxq->block_size);
 611
 612         *dp_rxqp = &rxq->dp;
 613         return 0;
 614
 615 fail_desc_alloc:
 616         rte_free(rxq);
 617
 618 fail_rxq_alloc:
 619 fail_no_block_dequeue:
 620 fail_get_contig_block_size:
 621         return rc;
 622 }
 623
 624 static sfc_dp_rx_qdestroy_t sfc_ef10_essb_rx_qdestroy;
 625 static void
 626 sfc_ef10_essb_rx_qdestroy(struct sfc_dp_rxq *dp_rxq)
 627 {
 628         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 629
 630         rte_free(rxq->sw_ring);
 631         rte_free(rxq);
 632 }
 633
 634 static sfc_dp_rx_qstart_t sfc_ef10_essb_rx_qstart;
 635 static int
 636 sfc_ef10_essb_rx_qstart(struct sfc_dp_rxq *dp_rxq, unsigned int evq_read_ptr)
 637 {
 638         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 639
 640         rxq->evq_read_ptr = evq_read_ptr;
 641
 642         /* Initialize before refill */
 643         rxq->completed = rxq->pending_id = rxq->added = 0;
 644         rxq->left_in_completed = rxq->left_in_pending = rxq->block_size;
 645         rxq->bufs_ptr = UINT_MAX;
 646         rxq->bufs_pending = 0;
 647
 648         sfc_ef10_essb_rx_qrefill(rxq);
 649
 650         rxq->flags |= SFC_EF10_ESSB_RXQ_STARTED;
 651         rxq->flags &=
 652                 ~(SFC_EF10_ESSB_RXQ_NOT_RUNNING | SFC_EF10_ESSB_RXQ_EXCEPTION);
 653
 654         return 0;
 655 }
 656
 657 static sfc_dp_rx_qstop_t sfc_ef10_essb_rx_qstop;
 658 static void
 659 sfc_ef10_essb_rx_qstop(struct sfc_dp_rxq *dp_rxq, unsigned int *evq_read_ptr)
 660 {
 661         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 662
 663         rxq->flags |= SFC_EF10_ESSB_RXQ_NOT_RUNNING;
 664
 665         *evq_read_ptr = rxq->evq_read_ptr;
 666 }
 667
 668 static sfc_dp_rx_qrx_ev_t sfc_ef10_essb_rx_qrx_ev;
 669 static bool
 670 sfc_ef10_essb_rx_qrx_ev(struct sfc_dp_rxq *dp_rxq, __rte_unused unsigned int id)
 671 {
 672         __rte_unused struct sfc_ef10_essb_rxq *rxq;
 673
 674         rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 675         SFC_ASSERT(rxq->flags & SFC_EF10_ESSB_RXQ_NOT_RUNNING);
 676
 677         /*
 678          * It is safe to ignore Rx event since we free all mbufs on
 679          * queue purge anyway.
 680          */
 681
 682         return false;
 683 }
 684
 685 static sfc_dp_rx_qpurge_t sfc_ef10_essb_rx_qpurge;
 686 static void
 687 sfc_ef10_essb_rx_qpurge(struct sfc_dp_rxq *dp_rxq)
 688 {
 689         struct sfc_ef10_essb_rxq *rxq = sfc_ef10_essb_rxq_by_dp_rxq(dp_rxq);
 690         unsigned int i;
 691         const struct sfc_ef10_essb_rx_sw_desc *rxd;
 692         struct rte_mbuf *m;
 693
 694         for (i = rxq->completed; i != rxq->added; ++i) {
 695                 rxd = &rxq->sw_ring[i & rxq->rxq_ptr_mask];
 696                 m = sfc_ef10_essb_mbuf_by_index(rxq, rxd->first_mbuf,
 697                                 rxq->block_size - rxq->left_in_completed);
 698                 while (rxq->left_in_completed > 0) {
 699                         rte_mbuf_raw_free(m);
 700                         m = sfc_ef10_essb_next_mbuf(rxq, m);
 701                         rxq->left_in_completed--;
 702                 }
 703                 rxq->left_in_completed = rxq->block_size;
 704         }
 705
 706         rxq->flags &= ~SFC_EF10_ESSB_RXQ_STARTED;
 707 }
 708
 709 struct sfc_dp_rx sfc_ef10_essb_rx = {
 710         .dp = {
 711                 .name           = SFC_KVARG_DATAPATH_EF10_ESSB,
 712                 .type           = SFC_DP_RX,
 713                 .hw_fw_caps     = SFC_DP_HW_FW_CAP_EF10 |
 714                                   SFC_DP_HW_FW_CAP_RX_ES_SUPER_BUFFER,
 715         },
 716         .features               = SFC_DP_RX_FEAT_FLOW_FLAG |
 717                                   SFC_DP_RX_FEAT_FLOW_MARK,
 718         .dev_offload_capa       = DEV_RX_OFFLOAD_CHECKSUM |
 719                                   DEV_RX_OFFLOAD_RSS_HASH,
 720         .queue_offload_capa     = 0,
 721         .get_dev_info           = sfc_ef10_essb_rx_get_dev_info,
 722         .pool_ops_supported     = sfc_ef10_essb_rx_pool_ops_supported,
 723         .qsize_up_rings         = sfc_ef10_essb_rx_qsize_up_rings,
 724         .qcreate                = sfc_ef10_essb_rx_qcreate,
 725         .qdestroy               = sfc_ef10_essb_rx_qdestroy,
 726         .qstart                 = sfc_ef10_essb_rx_qstart,
 727         .qstop                  = sfc_ef10_essb_rx_qstop,
 728         .qrx_ev                 = sfc_ef10_essb_rx_qrx_ev,
 729         .qpurge                 = sfc_ef10_essb_rx_qpurge,
 730         .supported_ptypes_get   = sfc_ef10_supported_ptypes_get,
 731         .qdesc_npending         = sfc_ef10_essb_rx_qdesc_npending,
 732         .qdesc_status           = sfc_ef10_essb_rx_qdesc_status,
 733         .pkt_burst              = sfc_ef10_essb_recv_pkts,
 734 };