drivers/net/enic/enic_rxtx_vec_avx2.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright 2008-2018 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  */
   5
   6 #include <rte_mbuf.h>
   7 #include <rte_ethdev_driver.h>
   8
   9 #include "enic_compat.h"
  10 #include "rq_enet_desc.h"
  11 #include "enic.h"
  12 #include "enic_rxtx_common.h"
  13
  14 #include <x86intrin.h>
  15
  16 static struct rte_mbuf *
  17 rx_one(struct cq_enet_rq_desc *cqd, struct rte_mbuf *mb, struct enic *enic)
  18 {
  19         bool tnl;
  20
  21         *(uint64_t *)&mb->rearm_data = enic->mbuf_initializer;
  22         mb->data_len = cqd->bytes_written_flags &
  23                 CQ_ENET_RQ_DESC_BYTES_WRITTEN_MASK;
  24         mb->pkt_len = mb->data_len;
  25         tnl = enic->overlay_offload && (cqd->completed_index_flags &
  26                                         CQ_ENET_RQ_DESC_FLAGS_FCOE) != 0;
  27         mb->packet_type =
  28                 enic_cq_rx_flags_to_pkt_type((struct cq_desc *)cqd, tnl);
  29         enic_cq_rx_to_pkt_flags((struct cq_desc *)cqd, mb);
  30         /* Wipe the outer types set by enic_cq_rx_flags_to_pkt_type() */
  31         if (tnl) {
  32                 mb->packet_type &= ~(RTE_PTYPE_L3_MASK |
  33                                      RTE_PTYPE_L4_MASK);
  34         }
  35         return mb;
  36 }
  37
  38 static uint16_t
  39 enic_noscatter_vec_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
  40                              uint16_t nb_pkts)
  41 {
  42         struct rte_mbuf **rx, **rxmb;
  43         uint16_t cq_idx, nb_rx, max_rx;
  44         struct cq_enet_rq_desc *cqd;
  45         struct rq_enet_desc *rqd;
  46         struct vnic_cq *cq;
  47         struct vnic_rq *rq;
  48         struct enic *enic;
  49         uint8_t color;
  50
  51         rq = rx_queue;
  52         enic = vnic_dev_priv(rq->vdev);
  53         cq = &enic->cq[enic_cq_rq(enic, rq->index)];
  54         cq_idx = cq->to_clean;
  55
  56         /*
  57          * Fill up the reserve of free mbufs. Below, we restock the receive
  58          * ring with these mbufs to avoid allocation failures.
  59          */
  60         if (rq->num_free_mbufs == 0) {
  61                 if (rte_mempool_get_bulk(rq->mp, (void **)rq->free_mbufs,
  62                                          ENIC_RX_BURST_MAX))
  63                         return 0;
  64                 rq->num_free_mbufs = ENIC_RX_BURST_MAX;
  65         }
  66         /* Receive until the end of the ring, at most. */
  67         max_rx = RTE_MIN(nb_pkts, rq->num_free_mbufs);
  68         max_rx = RTE_MIN(max_rx, cq->ring.desc_count - cq_idx);
  69
  70         rxmb = rq->mbuf_ring + cq_idx;
  71         color = cq->last_color;
  72         cqd = (struct cq_enet_rq_desc *)(cq->ring.descs) + cq_idx;
  73         rx = rx_pkts;
  74         if (max_rx == 0 ||
  75             (cqd->type_color & CQ_DESC_COLOR_MASK_NOSHIFT) == color)
  76                 return 0;
  77
  78         /* Step 1: Process one packet to do aligned 256-bit load below */
  79         if (cq_idx & 0x1) {
  80                 if (unlikely(cqd->bytes_written_flags &
  81                              CQ_ENET_RQ_DESC_FLAGS_TRUNCATED)) {
  82                         rte_pktmbuf_free(*rxmb++);
  83                         rte_atomic64_inc(&enic->soft_stats.rx_packet_errors);
  84                 } else {
  85                         *rx++ = rx_one(cqd, *rxmb++, enic);
  86                 }
  87                 cqd++;
  88                 max_rx--;
  89         }
  90
  91         const __m256i mask =
  92                 _mm256_set_epi8(/* Second descriptor */
  93                         0xff, /* type_color */
  94                         (CQ_ENET_RQ_DESC_FLAGS_IPV4_FRAGMENT |
  95                          CQ_ENET_RQ_DESC_FLAGS_IPV4 |
  96                          CQ_ENET_RQ_DESC_FLAGS_IPV6 |
  97                          CQ_ENET_RQ_DESC_FLAGS_TCP |
  98                          CQ_ENET_RQ_DESC_FLAGS_UDP), /* flags */
  99                         0, 0, /* checksum_fcoe */
 100                         0xff, 0xff, /* vlan */
 101                         0x3f, 0xff, /* bytes_written_flags */
 102                         0xff, 0xff, 0xff, 0xff, /* rss_hash */
 103                         0xff, 0xff, /* q_number_rss_type_flags */
 104                         0, 0, /* completed_index_flags */
 105                         /* First descriptor */
 106                         0xff, /* type_color */
 107                         (CQ_ENET_RQ_DESC_FLAGS_IPV4_FRAGMENT |
 108                          CQ_ENET_RQ_DESC_FLAGS_IPV4 |
 109                          CQ_ENET_RQ_DESC_FLAGS_IPV6 |
 110                          CQ_ENET_RQ_DESC_FLAGS_TCP |
 111                          CQ_ENET_RQ_DESC_FLAGS_UDP), /* flags */
 112                         0, 0, /* checksum_fcoe */
 113                         0xff, 0xff, /* vlan */
 114                         0x3f, 0xff, /* bytes_written_flags */
 115                         0xff, 0xff, 0xff, 0xff, /* rss_hash */
 116                         0xff, 0xff, /* q_number_rss_type_flags */
 117                         0, 0 /* completed_index_flags */
 118                         );
 119         const __m256i shuffle_mask =
 120                 _mm256_set_epi8(/* Second descriptor */
 121                         7, 6, 5, 4,             /* rss = rss_hash */
 122                         11, 10,                 /* vlan_tci = vlan */
 123                         9, 8,                   /* data_len = bytes_written */
 124                         0x80, 0x80, 9, 8,       /* pkt_len = bytes_written */
 125                         0x80, 0x80, 0x80, 0x80, /* packet_type = 0 */
 126                         /* First descriptor */
 127                         7, 6, 5, 4,             /* rss = rss_hash */
 128                         11, 10,                 /* vlan_tci = vlan */
 129                         9, 8,                   /* data_len = bytes_written */
 130                         0x80, 0x80, 9, 8,       /* pkt_len = bytes_written */
 131                         0x80, 0x80, 0x80, 0x80  /* packet_type = 0 */
 132                         );
 133         /* Used to collect 8 flags from 8 desc into one register */
 134         const __m256i flags_shuffle_mask =
 135                 _mm256_set_epi8(/* Second descriptor */
 136                         1, 3, 9, 14,
 137                         1, 3, 9, 14,
 138                         1, 3, 9, 14,
 139                         1, 3, 9, 14,
 140                         /* First descriptor */
 141                         1, 3, 9, 14,
 142                         1, 3, 9, 14,
 143                         1, 3, 9, 14,
 144                         /*
 145                          * Byte 3: upper byte of completed_index_flags
 146                          *         bit 5 = fcoe (tunnel)
 147                          * Byte 2: upper byte of q_number_rss_type_flags
 148                          *         bits 2,3,4,5 = rss type
 149                          *         bit 6 = csum_not_calc
 150                          * Byte 1: upper byte of bytes_written_flags
 151                          *         bit 6 = truncated
 152                          *         bit 7 = vlan stripped
 153                          * Byte 0: flags
 154                          */
 155                         1, 3, 9, 14
 156                         );
 157         /* Used to collect 8 VLAN IDs from 8 desc into one register */
 158         const __m256i vlan_shuffle_mask =
 159                 _mm256_set_epi8(/* Second descriptor */
 160                         0x80, 0x80, 11, 10,
 161                         0x80, 0x80, 11, 10,
 162                         0x80, 0x80, 11, 10,
 163                         0x80, 0x80, 11, 10,
 164                         /* First descriptor */
 165                         0x80, 0x80, 11, 10,
 166                         0x80, 0x80, 11, 10,
 167                         0x80, 0x80, 11, 10,
 168                         0x80, 0x80, 11, 10);
 169         /* PKT_RX_RSS_HASH is 1<<1 so fits in 8-bit integer */
 170         const __m256i rss_shuffle =
 171                 _mm256_set_epi8(/* second 128 bits */
 172                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 173                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 174                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 175                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 176                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 177                         0, /* rss_types = 0 */
 178                         /* first 128 bits */
 179                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 180                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 181                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 182                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 183                         PKT_RX_RSS_HASH, PKT_RX_RSS_HASH, PKT_RX_RSS_HASH,
 184                         0 /* rss_types = 0 */);
 185         /*
 186          * VLAN offload flags.
 187          * shuffle index:
 188          * vlan_stripped => bit 0
 189          * vlan_id == 0  => bit 1
 190          */
 191         const __m256i vlan_shuffle =
 192                 _mm256_set_epi32(0, 0, 0, 0,
 193                         PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED, 0,
 194                         PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED, PKT_RX_VLAN);
 195         /* Use the same shuffle index as vlan_shuffle */
 196         const __m256i vlan_ptype_shuffle =
 197                 _mm256_set_epi32(0, 0, 0, 0,
 198                                  RTE_PTYPE_L2_ETHER,
 199                                  RTE_PTYPE_L2_ETHER,
 200                                  RTE_PTYPE_L2_ETHER,
 201                                  RTE_PTYPE_L2_ETHER_VLAN);
 202         /*
 203          * CKSUM flags. Shift right so they fit int 8-bit integers.
 204          * shuffle index:
 205          * ipv4_csum_ok    => bit 3
 206          * ip4             => bit 2
 207          * tcp_or_udp      => bit 1
 208          * tcp_udp_csum_ok => bit 0
 209          */
 210         const __m256i csum_shuffle =
 211                 _mm256_set_epi8(/* second 128 bits */
 212                         /* 1111 ip4+ip4_ok+l4+l4_ok */
 213                         ((PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_GOOD) >> 1),
 214                         /* 1110 ip4_ok+ip4+l4+!l4_ok */
 215                         ((PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_BAD) >> 1),
 216                         (PKT_RX_IP_CKSUM_GOOD >> 1), /* 1101 ip4+ip4_ok */
 217                         (PKT_RX_IP_CKSUM_GOOD >> 1), /* 1100 ip4_ok+ip4 */
 218                         (PKT_RX_L4_CKSUM_GOOD >> 1), /* 1011 l4+l4_ok */
 219                         (PKT_RX_L4_CKSUM_BAD >> 1),  /* 1010 l4+!l4_ok */
 220                         0, /* 1001 */
 221                         0, /* 1000 */
 222                         /* 0111 !ip4_ok+ip4+l4+l4_ok */
 223                         ((PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_GOOD) >> 1),
 224                         /* 0110 !ip4_ok+ip4+l4+!l4_ok */
 225                         ((PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD) >> 1),
 226                         (PKT_RX_IP_CKSUM_BAD >> 1),  /* 0101 !ip4_ok+ip4 */
 227                         (PKT_RX_IP_CKSUM_BAD >> 1),  /* 0100 !ip4_ok+ip4 */
 228                         (PKT_RX_L4_CKSUM_GOOD >> 1), /* 0011 l4+l4_ok */
 229                         (PKT_RX_L4_CKSUM_BAD >> 1),  /* 0010 l4+!l4_ok */
 230                         0, /* 0001 */
 231                         0, /* 0000 */
 232                         /* first 128 bits */
 233                         ((PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_GOOD) >> 1),
 234                         ((PKT_RX_IP_CKSUM_GOOD | PKT_RX_L4_CKSUM_BAD) >> 1),
 235                         (PKT_RX_IP_CKSUM_GOOD >> 1),
 236                         (PKT_RX_IP_CKSUM_GOOD >> 1),
 237                         (PKT_RX_L4_CKSUM_GOOD >> 1),
 238                         (PKT_RX_L4_CKSUM_BAD >> 1),
 239                         0, 0,
 240                         ((PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_GOOD) >> 1),
 241                         ((PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD) >> 1),
 242                         (PKT_RX_IP_CKSUM_BAD >> 1),
 243                         (PKT_RX_IP_CKSUM_BAD >> 1),
 244                         (PKT_RX_L4_CKSUM_GOOD >> 1),
 245                         (PKT_RX_L4_CKSUM_BAD >> 1),
 246                         0, 0);
 247         /*
 248          * Non-fragment PTYPEs.
 249          * Shuffle 4-bit index:
 250          * ip6 => bit 0
 251          * ip4 => bit 1
 252          * udp => bit 2
 253          * tcp => bit 3
 254          *   bit
 255          * 3 2 1 0
 256          * -------
 257          * 0 0 0 0 unknown
 258          * 0 0 0 1 ip6 | nonfrag
 259          * 0 0 1 0 ip4 | nonfrag
 260          * 0 0 1 1 unknown
 261          * 0 1 0 0 unknown
 262          * 0 1 0 1 ip6 | udp
 263          * 0 1 1 0 ip4 | udp
 264          * 0 1 1 1 unknown
 265          * 1 0 0 0 unknown
 266          * 1 0 0 1 ip6 | tcp
 267          * 1 0 1 0 ip4 | tcp
 268          * 1 0 1 1 unknown
 269          * 1 1 0 0 unknown
 270          * 1 1 0 1 unknown
 271          * 1 1 1 0 unknown
 272          * 1 1 1 1 unknown
 273          *
 274          * PTYPEs do not fit in 8 bits, so shift right 4..
 275          */
 276         const __m256i nonfrag_ptype_shuffle =
 277                 _mm256_set_epi8(/* second 128 bits */
 278                         RTE_PTYPE_UNKNOWN,
 279                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 280                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 281                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_TCP) >> 4,
 282                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_TCP) >> 4,
 283                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 284                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_UDP) >> 4,
 285                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_UDP) >> 4,
 286                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 287                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 288                          RTE_PTYPE_L4_NONFRAG) >> 4,
 289                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 290                          RTE_PTYPE_L4_NONFRAG) >> 4,
 291                         RTE_PTYPE_UNKNOWN,
 292                         /* first 128 bits */
 293                         RTE_PTYPE_UNKNOWN,
 294                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 295                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 296                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_TCP) >> 4,
 297                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_TCP) >> 4,
 298                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 299                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN | RTE_PTYPE_L4_UDP) >> 4,
 300                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN | RTE_PTYPE_L4_UDP) >> 4,
 301                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 302                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 303                          RTE_PTYPE_L4_NONFRAG) >> 4,
 304                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 305                          RTE_PTYPE_L4_NONFRAG) >> 4,
 306                         RTE_PTYPE_UNKNOWN);
 307         /* Fragment PTYPEs. Use the same shuffle index as above. */
 308         const __m256i frag_ptype_shuffle =
 309                 _mm256_set_epi8(/* second 128 bits */
 310                         RTE_PTYPE_UNKNOWN,
 311                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 312                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 313                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 314                          RTE_PTYPE_L4_FRAG) >> 4,
 315                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 316                          RTE_PTYPE_L4_FRAG) >> 4,
 317                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 318                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 319                          RTE_PTYPE_L4_FRAG) >> 4,
 320                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 321                          RTE_PTYPE_L4_FRAG) >> 4,
 322                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 323                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 324                          RTE_PTYPE_L4_FRAG) >> 4,
 325                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 326                          RTE_PTYPE_L4_FRAG) >> 4,
 327                         RTE_PTYPE_UNKNOWN,
 328                         /* first 128 bits */
 329                         RTE_PTYPE_UNKNOWN,
 330                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 331                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 332                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 333                          RTE_PTYPE_L4_FRAG) >> 4,
 334                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 335                          RTE_PTYPE_L4_FRAG) >> 4,
 336                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 337                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 338                          RTE_PTYPE_L4_FRAG) >> 4,
 339                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 340                          RTE_PTYPE_L4_FRAG) >> 4,
 341                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 342                         (RTE_PTYPE_L3_IPV4_EXT_UNKNOWN |
 343                          RTE_PTYPE_L4_FRAG) >> 4,
 344                         (RTE_PTYPE_L3_IPV6_EXT_UNKNOWN |
 345                          RTE_PTYPE_L4_FRAG) >> 4,
 346                         RTE_PTYPE_UNKNOWN);
 347         /*
 348          * Tunnel PTYPEs. Use the same shuffle index as above.
 349          * L4 types are not part of this table. They come from non-tunnel
 350          * types above.
 351          */
 352         const __m256i tnl_l3_ptype_shuffle =
 353                 _mm256_set_epi8(/* second 128 bits */
 354                         RTE_PTYPE_UNKNOWN,
 355                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 356                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 357                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 358                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 359                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 360                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 361                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 362                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 363                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 364                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 365                         RTE_PTYPE_UNKNOWN,
 366                         /* first 128 bits */
 367                         RTE_PTYPE_UNKNOWN,
 368                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 369                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 370                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 371                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 372                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 373                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 374                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 375                         RTE_PTYPE_UNKNOWN, RTE_PTYPE_UNKNOWN,
 376                         RTE_PTYPE_INNER_L3_IPV4_EXT_UNKNOWN >> 16,
 377                         RTE_PTYPE_INNER_L3_IPV6_EXT_UNKNOWN >> 16,
 378                         RTE_PTYPE_UNKNOWN);
 379
 380         const __m256i mbuf_init = _mm256_set_epi64x(0, enic->mbuf_initializer,
 381                                                     0, enic->mbuf_initializer);
 382
 383         /*
 384          * --- cq desc fields ---    offset
 385          * completed_index_flags    - 0   use: fcoe
 386          * q_number_rss_type_flags  - 2   use: rss types, csum_not_calc
 387          * rss_hash                 - 4   ==> mbuf.hash.rss
 388          * bytes_written_flags      - 8   ==> mbuf.pkt_len,data_len
 389          *                                use: truncated, vlan_stripped
 390          * vlan                     - 10  ==> mbuf.vlan_tci
 391          * checksum_fcoe            - 12  (unused)
 392          * flags                    - 14  use: all bits
 393          * type_color               - 15  (unused)
 394          *
 395          * --- mbuf fields ---       offset
 396          * rearm_data              ---- 16
 397          * data_off    - 0      (mbuf_init) -+
 398          * refcnt      - 2      (mbuf_init)  |
 399          * nb_segs     - 4      (mbuf_init)  | 16B 128b
 400          * port        - 6      (mbuf_init)  |
 401          * ol_flag     - 8      (from cqd)  -+
 402          * rx_descriptor_fields1   ---- 32
 403          * packet_type - 0      (from cqd)  -+
 404          * pkt_len     - 4      (from cqd)   |
 405          * data_len    - 8      (from cqd)   | 16B 128b
 406          * vlan_tci    - 10     (from cqd)   |
 407          * rss         - 12     (from cqd)  -+
 408          */
 409
 410         __m256i overlay_enabled =
 411                 _mm256_set1_epi32((uint32_t)enic->overlay_offload);
 412
 413         /* Step 2: Process 8 packets per loop using SIMD */
 414         while (max_rx > 7 && (((cqd + 7)->type_color &
 415                                CQ_DESC_COLOR_MASK_NOSHIFT) != color)) {
 416                 /* Load 8 16B CQ descriptors */
 417                 __m256i cqd01 = _mm256_load_si256((void *)cqd);
 418                 __m256i cqd23 = _mm256_load_si256((void *)(cqd + 2));
 419                 __m256i cqd45 = _mm256_load_si256((void *)(cqd + 4));
 420                 __m256i cqd67 = _mm256_load_si256((void *)(cqd + 6));
 421                 /* Copy 8 mbuf pointers to rx_pkts */
 422                 _mm256_storeu_si256((void *)rx,
 423                                     _mm256_loadu_si256((void *)rxmb));
 424                 _mm256_storeu_si256((void *)(rx + 4),
 425                                     _mm256_loadu_si256((void *)(rxmb + 4)));
 426
 427                 /*
 428                  * Collect 8 flags (each 32 bits) into one register.
 429                  * 4 shuffles, 3 blends, 1 permute for 8 desc: 1 inst/desc
 430                  */
 431                 __m256i flags01 =
 432                         _mm256_shuffle_epi8(cqd01, flags_shuffle_mask);
 433                 /*
 434                  * Shuffle above produces 8 x 32-bit flags for 8 descriptors
 435                  * in this order: 0, 0, 0, 0, 1, 1, 1, 1
 436                  * The duplicates in each 128-bit lane simplifies blending
 437                  * below.
 438                  */
 439                 __m256i flags23 =
 440                         _mm256_shuffle_epi8(cqd23, flags_shuffle_mask);
 441                 __m256i flags45 =
 442                         _mm256_shuffle_epi8(cqd45, flags_shuffle_mask);
 443                 __m256i flags67 =
 444                         _mm256_shuffle_epi8(cqd67, flags_shuffle_mask);
 445                 /* 1st blend produces flags for desc: 0, 2, 0, 0, 1, 3, 1, 1 */
 446                 __m256i flags0_3 = _mm256_blend_epi32(flags01, flags23, 0x22);
 447                 /* 2nd blend produces flags for desc: 4, 4, 4, 6, 5, 5, 5, 7 */
 448                 __m256i flags4_7 = _mm256_blend_epi32(flags45, flags67, 0x88);
 449                 /* 3rd blend produces flags for desc: 0, 2, 4, 6, 1, 3, 5, 7 */
 450                 __m256i flags0_7 = _mm256_blend_epi32(flags0_3, flags4_7, 0xcc);
 451                 /*
 452                  * Swap to reorder flags in this order: 1, 3, 5, 7, 0, 2, 4, 6
 453                  * This order simplifies blend operations way below that
 454                  * produce 'rearm' data for each mbuf.
 455                  */
 456                 flags0_7 = _mm256_permute4x64_epi64(flags0_7,
 457                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 458
 459                 /*
 460                  * Check truncated bits and bail out early on.
 461                  * 6 avx inst, 1 or, 1 if-then-else for 8 desc: 1 inst/desc
 462                  */
 463                 __m256i trunc =
 464                         _mm256_srli_epi32(_mm256_slli_epi32(flags0_7, 17), 31);
 465                 trunc = _mm256_add_epi64(trunc, _mm256_permute4x64_epi64(trunc,
 466                         (1 << 6) + (0 << 4) + (3 << 2) + 2));
 467                 /* 0:63 contains 1+3+0+2 and 64:127 contains 5+7+4+6 */
 468                 if (_mm256_extract_epi64(trunc, 0) ||
 469                     _mm256_extract_epi64(trunc, 1))
 470                         break;
 471
 472                 /*
 473                  * Compute PKT_RX_RSS_HASH.
 474                  * Use 2 shifts and 1 shuffle for 8 desc: 0.375 inst/desc
 475                  * RSS types in byte 0, 4, 8, 12, 16, 20, 24, 28
 476                  * Everything else is zero.
 477                  */
 478                 __m256i rss_types =
 479                         _mm256_srli_epi32(_mm256_slli_epi32(flags0_7, 10), 28);
 480                 /*
 481                  * RSS flags (PKT_RX_RSS_HASH) are in
 482                  * byte 0, 4, 8, 12, 16, 20, 24, 28
 483                  * Everything else is zero.
 484                  */
 485                 __m256i rss_flags = _mm256_shuffle_epi8(rss_shuffle, rss_types);
 486
 487                 /*
 488                  * Compute CKSUM flags. First build the index and then
 489                  * use it to shuffle csum_shuffle.
 490                  * 20 instructions including const loads: 2.5 inst/desc
 491                  */
 492                 /*
 493                  * csum_not_calc (bit 22)
 494                  * csum_not_calc (0) => 0xffffffff
 495                  * csum_not_calc (1) => 0x0
 496                  */
 497                 const __m256i zero4 = _mm256_setzero_si256();
 498                 const __m256i mask22 = _mm256_set1_epi32(0x400000);
 499                 __m256i csum_not_calc = _mm256_cmpeq_epi32(zero4,
 500                         _mm256_and_si256(flags0_7, mask22));
 501                 /*
 502                  * (tcp|udp) && !fragment => bit 1
 503                  * tcp = bit 2, udp = bit 1, frag = bit 6
 504                  */
 505                 const __m256i mask1 = _mm256_set1_epi32(0x2);
 506                 __m256i tcp_udp =
 507                         _mm256_andnot_si256(_mm256_srli_epi32(flags0_7, 5),
 508                                 _mm256_or_si256(flags0_7,
 509                                         _mm256_srli_epi32(flags0_7, 1)));
 510                 tcp_udp = _mm256_and_si256(tcp_udp, mask1);
 511                 /* ipv4 (bit 5) => bit 2 */
 512                 const __m256i mask2 = _mm256_set1_epi32(0x4);
 513                 __m256i ipv4 = _mm256_and_si256(mask2,
 514                         _mm256_srli_epi32(flags0_7, 3));
 515                 /*
 516                  * ipv4_csum_ok (bit 3) => bit 3
 517                  * tcp_udp_csum_ok (bit 0) => bit 0
 518                  * 0x9
 519                  */
 520                 const __m256i mask0_3 = _mm256_set1_epi32(0x9);
 521                 __m256i csum_idx = _mm256_and_si256(flags0_7, mask0_3);
 522                 csum_idx = _mm256_and_si256(csum_not_calc,
 523                         _mm256_or_si256(_mm256_or_si256(csum_idx, ipv4),
 524                                 tcp_udp));
 525                 __m256i csum_flags =
 526                         _mm256_shuffle_epi8(csum_shuffle, csum_idx);
 527                 /* Shift left to restore CKSUM flags. See csum_shuffle. */
 528                 csum_flags = _mm256_slli_epi32(csum_flags, 1);
 529                 /* Combine csum flags and offload flags: 0.125 inst/desc */
 530                 rss_flags = _mm256_or_si256(rss_flags, csum_flags);
 531
 532                 /*
 533                  * Collect 8 VLAN IDs and compute vlan_id != 0 on each.
 534                  * 4 shuffles, 3 blends, 1 permute, 1 cmp, 1 sub for 8 desc:
 535                  * 1.25 inst/desc
 536                  */
 537                 __m256i vlan01 = _mm256_shuffle_epi8(cqd01, vlan_shuffle_mask);
 538                 __m256i vlan23 = _mm256_shuffle_epi8(cqd23, vlan_shuffle_mask);
 539                 __m256i vlan45 = _mm256_shuffle_epi8(cqd45, vlan_shuffle_mask);
 540                 __m256i vlan67 = _mm256_shuffle_epi8(cqd67, vlan_shuffle_mask);
 541                 __m256i vlan0_3 = _mm256_blend_epi32(vlan01, vlan23, 0x22);
 542                 __m256i vlan4_7 = _mm256_blend_epi32(vlan45, vlan67, 0x88);
 543                 /* desc: 0, 2, 4, 6, 1, 3, 5, 7 */
 544                 __m256i vlan0_7 = _mm256_blend_epi32(vlan0_3, vlan4_7, 0xcc);
 545                 /* desc: 1, 3, 5, 7, 0, 2, 4, 6 */
 546                 vlan0_7 = _mm256_permute4x64_epi64(vlan0_7,
 547                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 548                 /*
 549                  * Compare 0 == vlan_id produces 0xffffffff (-1) if
 550                  * vlan 0 and 0 if vlan non-0. Then subtracting the
 551                  * result from 0 produces 0 - (-1) = 1 for vlan 0, and
 552                  * 0 - 0 = 0 for vlan non-0.
 553                  */
 554                 vlan0_7 = _mm256_cmpeq_epi32(zero4, vlan0_7);
 555                 /* vlan_id != 0 => 0, vlan_id == 0 => 1 */
 556                 vlan0_7 = _mm256_sub_epi32(zero4, vlan0_7);
 557
 558                 /*
 559                  * Compute PKT_RX_VLAN and PKT_RX_VLAN_STRIPPED.
 560                  * Use 3 shifts, 1 or,  1 shuffle for 8 desc: 0.625 inst/desc
 561                  * VLAN offload flags in byte 0, 4, 8, 12, 16, 20, 24, 28
 562                  * Everything else is zero.
 563                  */
 564                 __m256i vlan_idx =
 565                         _mm256_or_si256(/* vlan_stripped => bit 0 */
 566                                 _mm256_srli_epi32(_mm256_slli_epi32(flags0_7,
 567                                         16), 31),
 568                                 /* (vlan_id == 0) => bit 1 */
 569                                 _mm256_slli_epi32(vlan0_7, 1));
 570                 /*
 571                  * The index captures 4 cases.
 572                  * stripped, id = 0   ==> 11b = 3
 573                  * stripped, id != 0  ==> 01b = 1
 574                  * not strip, id == 0 ==> 10b = 2
 575                  * not strip, id != 0 ==> 00b = 0
 576                  */
 577                 __m256i vlan_flags = _mm256_permutevar8x32_epi32(vlan_shuffle,
 578                         vlan_idx);
 579                 /* Combine vlan and offload flags: 0.125 inst/desc */
 580                 rss_flags = _mm256_or_si256(rss_flags, vlan_flags);
 581
 582                 /*
 583                  * Compute non-tunnel PTYPEs.
 584                  * 17 inst / 8 desc = 2.125 inst/desc
 585                  */
 586                 /* ETHER and ETHER_VLAN */
 587                 __m256i vlan_ptype =
 588                         _mm256_permutevar8x32_epi32(vlan_ptype_shuffle,
 589                                 vlan_idx);
 590                 /* Build the ptype index from flags */
 591                 tcp_udp = _mm256_slli_epi32(flags0_7, 29);
 592                 tcp_udp = _mm256_slli_epi32(_mm256_srli_epi32(tcp_udp, 30), 2);
 593                 __m256i ip4_ip6 =
 594                         _mm256_srli_epi32(_mm256_slli_epi32(flags0_7, 26), 30);
 595                 __m256i ptype_idx = _mm256_or_si256(tcp_udp, ip4_ip6);
 596                 __m256i frag_bit =
 597                         _mm256_srli_epi32(_mm256_slli_epi32(flags0_7, 25), 31);
 598                 __m256i nonfrag_ptype =
 599                         _mm256_shuffle_epi8(nonfrag_ptype_shuffle, ptype_idx);
 600                 __m256i frag_ptype =
 601                         _mm256_shuffle_epi8(frag_ptype_shuffle, ptype_idx);
 602                 /*
 603                  * Zero out the unwanted types and combine the remaining bits.
 604                  * The effect is same as selecting non-frag or frag types
 605                  * depending on the frag bit.
 606                  */
 607                 nonfrag_ptype = _mm256_and_si256(nonfrag_ptype,
 608                         _mm256_cmpeq_epi32(zero4, frag_bit));
 609                 frag_ptype = _mm256_and_si256(frag_ptype,
 610                         _mm256_cmpgt_epi32(frag_bit, zero4));
 611                 __m256i ptype = _mm256_or_si256(nonfrag_ptype, frag_ptype);
 612                 ptype = _mm256_slli_epi32(ptype, 4);
 613                 /*
 614                  * Compute tunnel PTYPEs.
 615                  * 15 inst / 8 desc = 1.875 inst/desc
 616                  */
 617                 __m256i tnl_l3_ptype =
 618                         _mm256_shuffle_epi8(tnl_l3_ptype_shuffle, ptype_idx);
 619                 tnl_l3_ptype = _mm256_slli_epi32(tnl_l3_ptype, 16);
 620                 /*
 621                  * Shift non-tunnel L4 types to make them tunnel types.
 622                  * RTE_PTYPE_L4_TCP << 16 == RTE_PTYPE_INNER_L4_TCP
 623                  */
 624                 __m256i tnl_l4_ptype =
 625                         _mm256_slli_epi32(_mm256_and_si256(ptype,
 626                                 _mm256_set1_epi32(RTE_PTYPE_L4_MASK)), 16);
 627                 __m256i tnl_ptype =
 628                         _mm256_or_si256(tnl_l3_ptype, tnl_l4_ptype);
 629                 tnl_ptype = _mm256_or_si256(tnl_ptype,
 630                         _mm256_set1_epi32(RTE_PTYPE_TUNNEL_GRENAT |
 631                                 RTE_PTYPE_INNER_L2_ETHER));
 632                 /*
 633                  * Select non-tunnel or tunnel types by zeroing out the
 634                  * unwanted ones.
 635                  */
 636                 __m256i tnl_flags = _mm256_and_si256(overlay_enabled,
 637                         _mm256_srli_epi32(_mm256_slli_epi32(flags0_7, 2), 31));
 638                 tnl_ptype = _mm256_and_si256(tnl_ptype,
 639                         _mm256_sub_epi32(zero4, tnl_flags));
 640                 ptype = _mm256_and_si256(ptype,
 641                         _mm256_cmpeq_epi32(zero4, tnl_flags));
 642                 /*
 643                  * Combine types and swap to have ptypes in the same order
 644                  * as desc.
 645                  * desc: 0 2 4 6 1 3 5 7
 646                  * 3 inst / 8 desc = 0.375 inst/desc
 647                  */
 648                 ptype = _mm256_or_si256(ptype, tnl_ptype);
 649                 ptype = _mm256_or_si256(ptype, vlan_ptype);
 650                 ptype = _mm256_permute4x64_epi64(ptype,
 651                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 652
 653                 /*
 654                  * Mask packet length.
 655                  * Use 4 ands: 0.5 instructions/desc
 656                  */
 657                 cqd01 = _mm256_and_si256(cqd01, mask);
 658                 cqd23 = _mm256_and_si256(cqd23, mask);
 659                 cqd45 = _mm256_and_si256(cqd45, mask);
 660                 cqd67 = _mm256_and_si256(cqd67, mask);
 661                 /*
 662                  * Shuffle. Two 16B sets of the mbuf fields.
 663                  * packet_type, pkt_len, data_len, vlan_tci, rss
 664                  */
 665                 __m256i rearm01 = _mm256_shuffle_epi8(cqd01, shuffle_mask);
 666                 __m256i rearm23 = _mm256_shuffle_epi8(cqd23, shuffle_mask);
 667                 __m256i rearm45 = _mm256_shuffle_epi8(cqd45, shuffle_mask);
 668                 __m256i rearm67 = _mm256_shuffle_epi8(cqd67, shuffle_mask);
 669
 670                 /*
 671                  * Blend in ptypes
 672                  * 4 blends and 3 shuffles for 8 desc: 0.875 inst/desc
 673                  */
 674                 rearm01 = _mm256_blend_epi32(rearm01, ptype, 0x11);
 675                 rearm23 = _mm256_blend_epi32(rearm23,
 676                         _mm256_shuffle_epi32(ptype, 1), 0x11);
 677                 rearm45 = _mm256_blend_epi32(rearm45,
 678                         _mm256_shuffle_epi32(ptype, 2), 0x11);
 679                 rearm67 = _mm256_blend_epi32(rearm67,
 680                         _mm256_shuffle_epi32(ptype, 3), 0x11);
 681
 682                 /*
 683                  * Move rss_flags into ol_flags in mbuf_init.
 684                  * Use 1 shift and 1 blend for each desc: 2 inst/desc
 685                  */
 686                 __m256i mbuf_init4_5 = _mm256_blend_epi32(mbuf_init,
 687                         rss_flags, 0x44);
 688                 __m256i mbuf_init2_3 = _mm256_blend_epi32(mbuf_init,
 689                         _mm256_slli_si256(rss_flags, 4), 0x44);
 690                 __m256i mbuf_init0_1 = _mm256_blend_epi32(mbuf_init,
 691                         _mm256_slli_si256(rss_flags, 8), 0x44);
 692                 __m256i mbuf_init6_7 = _mm256_blend_epi32(mbuf_init,
 693                         _mm256_srli_si256(rss_flags, 4), 0x44);
 694
 695                 /*
 696                  * Build rearm, one per desc.
 697                  * 8 blends and 4 permutes: 1.5 inst/desc
 698                  */
 699                 __m256i rearm0 = _mm256_blend_epi32(rearm01,
 700                         mbuf_init0_1, 0xf0);
 701                 __m256i rearm1 = _mm256_blend_epi32(mbuf_init0_1,
 702                         rearm01, 0xf0);
 703                 __m256i rearm2 = _mm256_blend_epi32(rearm23,
 704                         mbuf_init2_3, 0xf0);
 705                 __m256i rearm3 = _mm256_blend_epi32(mbuf_init2_3,
 706                         rearm23, 0xf0);
 707                 /* Swap upper and lower 64 bits */
 708                 rearm0 = _mm256_permute4x64_epi64(rearm0,
 709                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 710                 rearm2 = _mm256_permute4x64_epi64(rearm2,
 711                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 712                 /* Second set of 4 descriptors */
 713                 __m256i rearm4 = _mm256_blend_epi32(rearm45,
 714                         mbuf_init4_5, 0xf0);
 715                 __m256i rearm5 = _mm256_blend_epi32(mbuf_init4_5,
 716                         rearm45, 0xf0);
 717                 __m256i rearm6 = _mm256_blend_epi32(rearm67,
 718                         mbuf_init6_7, 0xf0);
 719                 __m256i rearm7 = _mm256_blend_epi32(mbuf_init6_7,
 720                         rearm67, 0xf0);
 721                 rearm4 = _mm256_permute4x64_epi64(rearm4,
 722                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 723                 rearm6 = _mm256_permute4x64_epi64(rearm6,
 724                         (1 << 6) + (0 << 4) + (3 << 2) + 2);
 725
 726                 /*
 727                  * Write out 32B of mbuf fields.
 728                  * data_off    - off 0  (mbuf_init)
 729                  * refcnt      - 2      (mbuf_init)
 730                  * nb_segs     - 4      (mbuf_init)
 731                  * port        - 6      (mbuf_init)
 732                  * ol_flag     - 8      (from cqd)
 733                  * packet_type - 16     (from cqd)
 734                  * pkt_len     - 20     (from cqd)
 735                  * data_len    - 24     (from cqd)
 736                  * vlan_tci    - 26     (from cqd)
 737                  * rss         - 28     (from cqd)
 738                  */
 739                 _mm256_storeu_si256((__m256i *)&rxmb[0]->rearm_data, rearm0);
 740                 _mm256_storeu_si256((__m256i *)&rxmb[1]->rearm_data, rearm1);
 741                 _mm256_storeu_si256((__m256i *)&rxmb[2]->rearm_data, rearm2);
 742                 _mm256_storeu_si256((__m256i *)&rxmb[3]->rearm_data, rearm3);
 743                 _mm256_storeu_si256((__m256i *)&rxmb[4]->rearm_data, rearm4);
 744                 _mm256_storeu_si256((__m256i *)&rxmb[5]->rearm_data, rearm5);
 745                 _mm256_storeu_si256((__m256i *)&rxmb[6]->rearm_data, rearm6);
 746                 _mm256_storeu_si256((__m256i *)&rxmb[7]->rearm_data, rearm7);
 747
 748                 max_rx -= 8;
 749                 cqd += 8;
 750                 rx += 8;
 751                 rxmb += 8;
 752         }
 753
 754         /*
 755          * Step 3: Slow path to handle a small (<8) number of packets and
 756          * occasional truncated packets.
 757          */
 758         while (max_rx && ((cqd->type_color &
 759                            CQ_DESC_COLOR_MASK_NOSHIFT) != color)) {
 760                 if (unlikely(cqd->bytes_written_flags &
 761                              CQ_ENET_RQ_DESC_FLAGS_TRUNCATED)) {
 762                         rte_pktmbuf_free(*rxmb++);
 763                         rte_atomic64_inc(&enic->soft_stats.rx_packet_errors);
 764                 } else {
 765                         *rx++ = rx_one(cqd, *rxmb++, enic);
 766                 }
 767                 cqd++;
 768                 max_rx--;
 769         }
 770
 771         /* Number of descriptors visited */
 772         nb_rx = cqd - (struct cq_enet_rq_desc *)(cq->ring.descs) - cq_idx;
 773         if (nb_rx == 0)
 774                 return 0;
 775         rqd = ((struct rq_enet_desc *)rq->ring.descs) + cq_idx;
 776         rxmb = rq->mbuf_ring + cq_idx;
 777         cq_idx += nb_rx;
 778         rq->rx_nb_hold += nb_rx;
 779         if (unlikely(cq_idx == cq->ring.desc_count)) {
 780                 cq_idx = 0;
 781                 cq->last_color ^= CQ_DESC_COLOR_MASK_NOSHIFT;
 782         }
 783         cq->to_clean = cq_idx;
 784
 785         /* Step 4: Restock RQ with new mbufs */
 786         memcpy(rxmb, rq->free_mbufs + ENIC_RX_BURST_MAX - rq->num_free_mbufs,
 787                sizeof(struct rte_mbuf *) * nb_rx);
 788         rq->num_free_mbufs -= nb_rx;
 789         while (nb_rx) {
 790                 rqd->address = (*rxmb)->buf_iova + RTE_PKTMBUF_HEADROOM;
 791                 nb_rx--;
 792                 rqd++;
 793                 rxmb++;
 794         }
 795         if (rq->rx_nb_hold > rq->rx_free_thresh) {
 796                 rq->posted_index = enic_ring_add(rq->ring.desc_count,
 797                                                  rq->posted_index,
 798                                                  rq->rx_nb_hold);
 799                 rq->rx_nb_hold = 0;
 800                 rte_wmb();
 801                 iowrite32_relaxed(rq->posted_index,
 802                                   &rq->ctrl->posted_index);
 803         }
 804
 805         return rx - rx_pkts;
 806 }
 807
 808 bool
 809 enic_use_vector_rx_handler(struct rte_eth_dev *eth_dev)
 810 {
 811         struct enic *enic = pmd_priv(eth_dev);
 812         struct rte_fdir_conf *fconf;
 813
 814         /* User needs to request for the avx2 handler */
 815         if (!enic->enable_avx2_rx)
 816                 return false;
 817         /* Do not support scatter Rx */
 818         if (!(enic->rq_count > 0 && enic->rq[0].data_queue_enable == 0))
 819                 return false;
 820         /* Do not support fdir/flow */
 821         fconf = &eth_dev->data->dev_conf.fdir_conf;
 822         if (fconf->mode != RTE_FDIR_MODE_NONE)
 823                 return false;
 824         if (rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2)) {
 825                 ENICPMD_LOG(DEBUG, " use the non-scatter avx2 Rx handler");
 826                 eth_dev->rx_pkt_burst = &enic_noscatter_vec_recv_pkts;
 827                 enic->use_noscatter_vec_rx_handler = 1;
 828                 return true;
 829         }
 830         return false;
 831 }