drivers/net/bnxt/bnxt_rxtx_vec_neon.c

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2 /* Copyright(c) 2019-2021 Broadcom All rights reserved. */
   3
   4 #include <inttypes.h>
   5 #include <stdbool.h>
   6
   7 #include <rte_bitmap.h>
   8 #include <rte_byteorder.h>
   9 #include <rte_malloc.h>
  10 #include <rte_memory.h>
  11 #include <rte_vect.h>
  12
  13 #include "bnxt.h"
  14 #include "bnxt_cpr.h"
  15 #include "bnxt_ring.h"
  16
  17 #include "bnxt_txq.h"
  18 #include "bnxt_txr.h"
  19 #include "bnxt_rxtx_vec_common.h"
  20
  21 /*
  22  * RX Ring handling
  23  */
  24
  25 #define GET_OL_FLAGS(rss_flags, ol_idx, errors, pi, ol_flags)                  \
  26 {                                                                              \
  27         uint32_t tmp, of;                                                      \
  28                                                                                \
  29         of = vgetq_lane_u32((rss_flags), (pi)) |                               \
  30                    rxr->ol_flags_table[vgetq_lane_u32((ol_idx), (pi))];        \
  31                                                                                \
  32         tmp = vgetq_lane_u32((errors), (pi));                                  \
  33         if (tmp)                                                               \
  34                 of |= rxr->ol_flags_err_table[tmp];                            \
  35         (ol_flags) = of;                                                       \
  36 }
  37
  38 #define GET_DESC_FIELDS(rxcmp, rxcmp1, shuf_msk, ptype_idx, pkt_idx, ret)      \
  39 {                                                                              \
  40         uint32_t ptype;                                                        \
  41         uint16_t vlan_tci;                                                     \
  42         uint32x4_t r;                                                          \
  43                                                                                \
  44         /* Set mbuf pkt_len, data_len, and rss_hash fields. */                 \
  45         r = vreinterpretq_u32_u8(vqtbl1q_u8(vreinterpretq_u8_u32(rxcmp),       \
  46                                               (shuf_msk)));                    \
  47                                                                                \
  48         /* Set packet type. */                                                 \
  49         ptype = bnxt_ptype_table[vgetq_lane_u32((ptype_idx), (pkt_idx))];      \
  50         r = vsetq_lane_u32(ptype, r, 0);                                       \
  51                                                                                \
  52         /* Set vlan_tci. */                                                    \
  53         vlan_tci = vgetq_lane_u32((rxcmp1), 1);                                \
  54         r = vreinterpretq_u32_u16(vsetq_lane_u16(vlan_tci,                     \
  55                                 vreinterpretq_u16_u32(r), 5));                 \
  56         (ret) = r;                                                             \
  57 }
  58
  59 static void
  60 descs_to_mbufs(uint32x4_t mm_rxcmp[4], uint32x4_t mm_rxcmp1[4],
  61                uint64x2_t mb_init, struct rte_mbuf **mbuf,
  62                struct bnxt_rx_ring_info *rxr)
  63 {
  64         const uint8x16_t shuf_msk = {
  65                 0xFF, 0xFF, 0xFF, 0xFF,    /* pkt_type (zeroes) */
  66                 2, 3, 0xFF, 0xFF,          /* pkt_len */
  67                 2, 3,                      /* data_len */
  68                 0xFF, 0xFF,                /* vlan_tci (zeroes) */
  69                 12, 13, 14, 15             /* rss hash */
  70         };
  71         const uint32x4_t flags_type_mask =
  72                 vdupq_n_u32(RX_PKT_CMPL_FLAGS_ITYPE_MASK);
  73         const uint32x4_t flags2_mask1 =
  74                 vdupq_n_u32(CMPL_FLAGS2_VLAN_TUN_MSK);
  75         const uint32x4_t flags2_mask2 =
  76                 vdupq_n_u32(RX_PKT_CMPL_FLAGS2_IP_TYPE);
  77         const uint32x4_t rss_mask =
  78                 vdupq_n_u32(RX_PKT_CMPL_FLAGS_RSS_VALID);
  79         const uint32x4_t flags2_index_mask = vdupq_n_u32(0x1F);
  80         const uint32x4_t flags2_error_mask = vdupq_n_u32(0x0F);
  81         uint32x4_t flags_type, flags2, index, errors, rss_flags;
  82         uint32x4_t tmp, ptype_idx, is_tunnel;
  83         uint64x2_t t0, t1;
  84         uint32_t ol_flags;
  85
  86         /* Validate ptype table indexing at build time. */
  87         bnxt_check_ptype_constants();
  88
  89         /* Compute packet type table indexes for four packets */
  90         t0 = vreinterpretq_u64_u32(vzip1q_u32(mm_rxcmp[0], mm_rxcmp[1]));
  91         t1 = vreinterpretq_u64_u32(vzip1q_u32(mm_rxcmp[2], mm_rxcmp[3]));
  92
  93         flags_type = vreinterpretq_u32_u64(vcombine_u64(vget_low_u64(t0),
  94                                                         vget_low_u64(t1)));
  95         ptype_idx = vshrq_n_u32(vandq_u32(flags_type, flags_type_mask),
  96                                 RX_PKT_CMPL_FLAGS_ITYPE_SFT -
  97                                 BNXT_PTYPE_TBL_TYPE_SFT);
  98
  99         t0 = vreinterpretq_u64_u32(vzip1q_u32(mm_rxcmp1[0], mm_rxcmp1[1]));
 100         t1 = vreinterpretq_u64_u32(vzip1q_u32(mm_rxcmp1[2], mm_rxcmp1[3]));
 101
 102         flags2 = vreinterpretq_u32_u64(vcombine_u64(vget_low_u64(t0),
 103                                                     vget_low_u64(t1)));
 104
 105         ptype_idx = vorrq_u32(ptype_idx,
 106                         vshrq_n_u32(vandq_u32(flags2, flags2_mask1),
 107                                     RX_PKT_CMPL_FLAGS2_META_FORMAT_SFT -
 108                                     BNXT_PTYPE_TBL_VLAN_SFT));
 109         ptype_idx = vorrq_u32(ptype_idx,
 110                         vshrq_n_u32(vandq_u32(flags2, flags2_mask2),
 111                                     RX_PKT_CMPL_FLAGS2_IP_TYPE_SFT -
 112                                     BNXT_PTYPE_TBL_IP_VER_SFT));
 113
 114         /* Extract RSS valid flags for four packets. */
 115         rss_flags = vshrq_n_u32(vandq_u32(flags_type, rss_mask), 9);
 116
 117         flags2 = vandq_u32(flags2, flags2_index_mask);
 118
 119         /* Extract errors_v2 fields for four packets. */
 120         t0 = vreinterpretq_u64_u32(vzip2q_u32(mm_rxcmp1[0], mm_rxcmp1[1]));
 121         t1 = vreinterpretq_u64_u32(vzip2q_u32(mm_rxcmp1[2], mm_rxcmp1[3]));
 122
 123         errors = vreinterpretq_u32_u64(vcombine_u64(vget_low_u64(t0),
 124                                                     vget_low_u64(t1)));
 125
 126         /* Compute ol_flags and checksum error indexes for four packets. */
 127         is_tunnel = vandq_u32(flags2, vdupq_n_u32(4));
 128         is_tunnel = vshlq_n_u32(is_tunnel, 3);
 129         errors = vandq_u32(vshrq_n_u32(errors, 4), flags2_error_mask);
 130         errors = vandq_u32(errors, flags2);
 131
 132         index = vbicq_u32(flags2, errors);
 133         errors = vorrq_u32(errors, vshrq_n_u32(is_tunnel, 1));
 134         index = vorrq_u32(index, is_tunnel);
 135
 136         /* Update mbuf rearm_data for four packets. */
 137         GET_OL_FLAGS(rss_flags, index, errors, 0, ol_flags);
 138         vst1q_u32((uint32_t *)&mbuf[0]->rearm_data,
 139                   vsetq_lane_u32(ol_flags, vreinterpretq_u32_u64(mb_init), 2));
 140         GET_OL_FLAGS(rss_flags, index, errors, 1, ol_flags);
 141         vst1q_u32((uint32_t *)&mbuf[1]->rearm_data,
 142                   vsetq_lane_u32(ol_flags, vreinterpretq_u32_u64(mb_init), 2));
 143         GET_OL_FLAGS(rss_flags, index, errors, 2, ol_flags);
 144         vst1q_u32((uint32_t *)&mbuf[2]->rearm_data,
 145                   vsetq_lane_u32(ol_flags, vreinterpretq_u32_u64(mb_init), 2));
 146         GET_OL_FLAGS(rss_flags, index, errors, 3, ol_flags);
 147         vst1q_u32((uint32_t *)&mbuf[3]->rearm_data,
 148                   vsetq_lane_u32(ol_flags, vreinterpretq_u32_u64(mb_init), 2));
 149
 150         /* Update mbuf rx_descriptor_fields1 for four packets. */
 151         GET_DESC_FIELDS(mm_rxcmp[0], mm_rxcmp1[0], shuf_msk, ptype_idx, 0, tmp);
 152         vst1q_u32((uint32_t *)&mbuf[0]->rx_descriptor_fields1, tmp);
 153         GET_DESC_FIELDS(mm_rxcmp[1], mm_rxcmp1[1], shuf_msk, ptype_idx, 1, tmp);
 154         vst1q_u32((uint32_t *)&mbuf[1]->rx_descriptor_fields1, tmp);
 155         GET_DESC_FIELDS(mm_rxcmp[2], mm_rxcmp1[2], shuf_msk, ptype_idx, 2, tmp);
 156         vst1q_u32((uint32_t *)&mbuf[2]->rx_descriptor_fields1, tmp);
 157         GET_DESC_FIELDS(mm_rxcmp[3], mm_rxcmp1[3], shuf_msk, ptype_idx, 3, tmp);
 158         vst1q_u32((uint32_t *)&mbuf[3]->rx_descriptor_fields1, tmp);
 159 }
 160
 161 static uint16_t
 162 recv_burst_vec_neon(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 163 {
 164         struct bnxt_rx_queue *rxq = rx_queue;
 165         struct bnxt_cp_ring_info *cpr = rxq->cp_ring;
 166         struct bnxt_rx_ring_info *rxr = rxq->rx_ring;
 167         uint16_t cp_ring_size = cpr->cp_ring_struct->ring_size;
 168         uint16_t rx_ring_size = rxr->rx_ring_struct->ring_size;
 169         struct cmpl_base *cp_desc_ring = cpr->cp_desc_ring;
 170         uint64_t valid, desc_valid_mask = ~0UL;
 171         const uint32x4_t info3_v_mask = vdupq_n_u32(CMPL_BASE_V);
 172         uint32_t raw_cons = cpr->cp_raw_cons;
 173         uint32_t cons, mbcons;
 174         int nb_rx_pkts = 0;
 175         const uint64x2_t mb_init = {rxq->mbuf_initializer, 0};
 176         const uint32x4_t valid_target =
 177                 vdupq_n_u32(!!(raw_cons & cp_ring_size));
 178         int i;
 179
 180         /* If Rx Q was stopped return */
 181         if (unlikely(!rxq->rx_started))
 182                 return 0;
 183
 184         if (rxq->rxrearm_nb >= rxq->rx_free_thresh)
 185                 bnxt_rxq_rearm(rxq, rxr);
 186
 187         cons = raw_cons & (cp_ring_size - 1);
 188         mbcons = (raw_cons / 2) & (rx_ring_size - 1);
 189
 190         /* Prefetch first four descriptor pairs. */
 191         rte_prefetch0(&cp_desc_ring[cons]);
 192         rte_prefetch0(&cp_desc_ring[cons + 4]);
 193
 194         /* Ensure that we do not go past the ends of the rings. */
 195         nb_pkts = RTE_MIN(nb_pkts, RTE_MIN(rx_ring_size - mbcons,
 196                                            (cp_ring_size - cons) / 2));
 197         /*
 198          * If we are at the end of the ring, ensure that descriptors after the
 199          * last valid entry are not treated as valid. Otherwise, force the
 200          * maximum number of packets to receive to be a multiple of the per-
 201          * loop count.
 202          */
 203         if (nb_pkts < BNXT_RX_DESCS_PER_LOOP_VEC128) {
 204                 desc_valid_mask >>=
 205                         16 * (BNXT_RX_DESCS_PER_LOOP_VEC128 - nb_pkts);
 206         } else {
 207                 nb_pkts =
 208                         RTE_ALIGN_FLOOR(nb_pkts, BNXT_RX_DESCS_PER_LOOP_VEC128);
 209         }
 210
 211         /* Handle RX burst request */
 212         for (i = 0; i < nb_pkts; i += BNXT_RX_DESCS_PER_LOOP_VEC128,
 213                                   cons += BNXT_RX_DESCS_PER_LOOP_VEC128 * 2,
 214                                   mbcons += BNXT_RX_DESCS_PER_LOOP_VEC128) {
 215                 uint32x4_t rxcmp1[BNXT_RX_DESCS_PER_LOOP_VEC128];
 216                 uint32x4_t rxcmp[BNXT_RX_DESCS_PER_LOOP_VEC128];
 217                 uint32x4_t info3_v;
 218                 uint64x2_t t0, t1;
 219                 uint32_t num_valid;
 220
 221                 /* Copy four mbuf pointers to output array. */
 222                 t0 = vld1q_u64((void *)&rxr->rx_buf_ring[mbcons]);
 223 #ifdef RTE_ARCH_ARM64
 224                 t1 = vld1q_u64((void *)&rxr->rx_buf_ring[mbcons + 2]);
 225 #endif
 226                 vst1q_u64((void *)&rx_pkts[i], t0);
 227 #ifdef RTE_ARCH_ARM64
 228                 vst1q_u64((void *)&rx_pkts[i + 2], t1);
 229 #endif
 230
 231                 /* Prefetch four descriptor pairs for next iteration. */
 232                 if (i + BNXT_RX_DESCS_PER_LOOP_VEC128 < nb_pkts) {
 233                         rte_prefetch0(&cp_desc_ring[cons + 8]);
 234                         rte_prefetch0(&cp_desc_ring[cons + 12]);
 235                 }
 236
 237                 /*
 238                  * Load the four current descriptors into SSE registers in
 239                  * reverse order to ensure consistent state.
 240                  */
 241                 rxcmp1[3] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 7]);
 242                 rte_io_rmb();
 243                 rxcmp[3] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 6]);
 244
 245                 rxcmp1[2] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 5]);
 246                 rte_io_rmb();
 247                 rxcmp[2] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 4]);
 248
 249                 t1 = vreinterpretq_u64_u32(vzip2q_u32(rxcmp1[2], rxcmp1[3]));
 250
 251                 rxcmp1[1] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 3]);
 252                 rte_io_rmb();
 253                 rxcmp[1] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 2]);
 254
 255                 rxcmp1[0] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 1]);
 256                 rte_io_rmb();
 257                 rxcmp[0] = vld1q_u32((void *)&cpr->cp_desc_ring[cons + 0]);
 258
 259                 t0 = vreinterpretq_u64_u32(vzip2q_u32(rxcmp1[0], rxcmp1[1]));
 260
 261                 /* Isolate descriptor status flags. */
 262                 info3_v = vreinterpretq_u32_u64(vcombine_u64(vget_low_u64(t0),
 263                                                              vget_low_u64(t1)));
 264                 info3_v = vandq_u32(info3_v, info3_v_mask);
 265                 info3_v = veorq_u32(info3_v, valid_target);
 266
 267                 /*
 268                  * Pack the 128-bit array of valid descriptor flags into 64
 269                  * bits and count the number of set bits in order to determine
 270                  * the number of valid descriptors.
 271                  */
 272                 valid = vget_lane_u64(vreinterpret_u64_u16(vqmovn_u32(info3_v)),
 273                                       0);
 274                 /*
 275                  * At this point, 'valid' is a 64-bit value containing four
 276                  * 16-bit fields, each of which is either 0x0001 or 0x0000.
 277                  * Compute number of valid descriptors from the index of
 278                  * the highest non-zero field.
 279                  */
 280                 num_valid = (sizeof(uint64_t) / sizeof(uint16_t)) -
 281                                 (__builtin_clzl(valid & desc_valid_mask) / 16);
 282
 283                 if (num_valid == 0)
 284                         break;
 285
 286                 descs_to_mbufs(rxcmp, rxcmp1, mb_init, &rx_pkts[nb_rx_pkts],
 287                                rxr);
 288                 nb_rx_pkts += num_valid;
 289
 290                 if (num_valid < BNXT_RX_DESCS_PER_LOOP_VEC128)
 291                         break;
 292         }
 293
 294         if (nb_rx_pkts) {
 295                 rxr->rx_raw_prod = RING_ADV(rxr->rx_raw_prod, nb_rx_pkts);
 296
 297                 rxq->rxrearm_nb += nb_rx_pkts;
 298                 cpr->cp_raw_cons += 2 * nb_rx_pkts;
 299                 bnxt_db_cq(cpr);
 300         }
 301
 302         return nb_rx_pkts;
 303 }
 304
 305 uint16_t
 306 bnxt_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 307 {
 308         uint16_t cnt = 0;
 309
 310         while (nb_pkts > RTE_BNXT_MAX_RX_BURST) {
 311                 uint16_t burst;
 312
 313                 burst = recv_burst_vec_neon(rx_queue, rx_pkts + cnt,
 314                                             RTE_BNXT_MAX_RX_BURST);
 315
 316                 cnt += burst;
 317                 nb_pkts -= burst;
 318
 319                 if (burst < RTE_BNXT_MAX_RX_BURST)
 320                         return cnt;
 321         }
 322
 323         return cnt + recv_burst_vec_neon(rx_queue, rx_pkts + cnt, nb_pkts);
 324 }
 325
 326 static void
 327 bnxt_handle_tx_cp_vec(struct bnxt_tx_queue *txq)
 328 {
 329         struct bnxt_cp_ring_info *cpr = txq->cp_ring;
 330         uint32_t raw_cons = cpr->cp_raw_cons;
 331         uint32_t cons;
 332         uint32_t nb_tx_pkts = 0;
 333         struct tx_cmpl *txcmp;
 334         struct cmpl_base *cp_desc_ring = cpr->cp_desc_ring;
 335         struct bnxt_ring *cp_ring_struct = cpr->cp_ring_struct;
 336         uint32_t ring_mask = cp_ring_struct->ring_mask;
 337
 338         do {
 339                 cons = RING_CMPL(ring_mask, raw_cons);
 340                 txcmp = (struct tx_cmpl *)&cp_desc_ring[cons];
 341
 342                 if (!CMP_VALID(txcmp, raw_cons, cp_ring_struct))
 343                         break;
 344
 345                 if (likely(CMP_TYPE(txcmp) == TX_CMPL_TYPE_TX_L2))
 346                         nb_tx_pkts += txcmp->opaque;
 347                 else
 348                         RTE_LOG_DP(ERR, PMD,
 349                                    "Unhandled CMP type %02x\n",
 350                                    CMP_TYPE(txcmp));
 351                 raw_cons = NEXT_RAW_CMP(raw_cons);
 352         } while (nb_tx_pkts < ring_mask);
 353
 354         if (nb_tx_pkts) {
 355                 if (txq->offloads & DEV_TX_OFFLOAD_MBUF_FAST_FREE)
 356                         bnxt_tx_cmp_vec_fast(txq, nb_tx_pkts);
 357                 else
 358                         bnxt_tx_cmp_vec(txq, nb_tx_pkts);
 359                 cpr->cp_raw_cons = raw_cons;
 360                 bnxt_db_cq(cpr);
 361         }
 362 }
 363
 364 static uint16_t
 365 bnxt_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 366                           uint16_t nb_pkts)
 367 {
 368         struct bnxt_tx_queue *txq = tx_queue;
 369         struct bnxt_tx_ring_info *txr = txq->tx_ring;
 370         uint16_t tx_prod, tx_raw_prod = txr->tx_raw_prod;
 371         struct rte_mbuf *tx_mbuf;
 372         struct tx_bd_long *txbd = NULL;
 373         struct rte_mbuf **tx_buf;
 374         uint16_t to_send;
 375
 376         nb_pkts = RTE_MIN(nb_pkts, bnxt_tx_avail(txq));
 377
 378         if (unlikely(nb_pkts == 0))
 379                 return 0;
 380
 381         /* Handle TX burst request */
 382         to_send = nb_pkts;
 383         while (to_send) {
 384                 tx_mbuf = *tx_pkts++;
 385                 rte_prefetch0(tx_mbuf);
 386
 387                 tx_prod = RING_IDX(txr->tx_ring_struct, tx_raw_prod);
 388                 tx_buf = &txr->tx_buf_ring[tx_prod];
 389                 *tx_buf = tx_mbuf;
 390
 391                 txbd = &txr->tx_desc_ring[tx_prod];
 392                 txbd->address = tx_mbuf->buf_iova + tx_mbuf->data_off;
 393                 txbd->len = tx_mbuf->data_len;
 394                 txbd->flags_type = bnxt_xmit_flags_len(tx_mbuf->data_len,
 395                                                        TX_BD_FLAGS_NOCMPL);
 396                 tx_raw_prod = RING_NEXT(tx_raw_prod);
 397                 to_send--;
 398         }
 399
 400         /* Request a completion for last packet in burst */
 401         if (txbd) {
 402                 txbd->opaque = nb_pkts;
 403                 txbd->flags_type &= ~TX_BD_LONG_FLAGS_NO_CMPL;
 404         }
 405
 406         rte_compiler_barrier();
 407         bnxt_db_write(&txr->tx_db, tx_raw_prod);
 408
 409         txr->tx_raw_prod = tx_raw_prod;
 410
 411         return nb_pkts;
 412 }
 413
 414 uint16_t
 415 bnxt_xmit_pkts_vec(void *tx_queue, struct rte_mbuf **tx_pkts,
 416                    uint16_t nb_pkts)
 417 {
 418         int nb_sent = 0;
 419         struct bnxt_tx_queue *txq = tx_queue;
 420
 421         /* Tx queue was stopped; wait for it to be restarted */
 422         if (unlikely(!txq->tx_started)) {
 423                 PMD_DRV_LOG(DEBUG, "Tx q stopped;return\n");
 424                 return 0;
 425         }
 426
 427         /* Handle TX completions */
 428         if (bnxt_tx_bds_in_hw(txq) >= txq->tx_free_thresh)
 429                 bnxt_handle_tx_cp_vec(txq);
 430
 431         while (nb_pkts) {
 432                 uint16_t ret, num;
 433
 434                 num = RTE_MIN(nb_pkts, RTE_BNXT_MAX_TX_BURST);
 435                 ret = bnxt_xmit_fixed_burst_vec(tx_queue,
 436                                                 &tx_pkts[nb_sent],
 437                                                 num);
 438                 nb_sent += ret;
 439                 nb_pkts -= ret;
 440                 if (ret < num)
 441                         break;
 442         }
 443
 444         return nb_sent;
 445 }
 446
 447 int __rte_cold
 448 bnxt_rxq_vec_setup(struct bnxt_rx_queue *rxq)
 449 {
 450         return bnxt_rxq_vec_setup_common(rxq);
 451 }