buffer.c

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/*
 * Copyright (c) 2017 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * buffer.c: allocate/free network buffers.
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * @file
 *
 * Allocate/free network buffers.
 */

#include <rte_config.h>

#include <rte_common.h>
#include <rte_log.h>
#include <rte_memory.h>
#include <rte_memzone.h>
#include <rte_tailq.h>
#include <rte_eal.h>
#include <rte_per_lcore.h>
#include <rte_launch.h>
#include <rte_atomic.h>
#include <rte_cycles.h>
#include <rte_prefetch.h>
#include <rte_lcore.h>
#include <rte_per_lcore.h>
#include <rte_branch_prediction.h>
#include <rte_interrupts.h>
#include <rte_pci.h>
#include <rte_random.h>
#include <rte_debug.h>
#include <rte_ether.h>
#include <rte_ethdev.h>
#include <rte_ring.h>
#include <rte_mempool.h>
#include <rte_mbuf.h>
#include <rte_version.h>

#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <dpdk/device/dpdk.h>
#include <dpdk/device/dpdk_priv.h>


STATIC_ASSERT (VLIB_BUFFER_PRE_DATA_SIZE == RTE_PKTMBUF_HEADROOM,
               "VLIB_BUFFER_PRE_DATA_SIZE must be equal to RTE_PKTMBUF_HEADROOM");

typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  struct rte_mbuf ***mbuf_pending_free_list;

  /* cached last pool */
  struct rte_mempool *last_pool;
  u8 last_buffer_pool_index;
} dpdk_buffer_per_thread_data;

typedef struct
{
  dpdk_buffer_per_thread_data *ptd;
} dpdk_buffer_main_t;

dpdk_buffer_main_t dpdk_buffer_main;

static_always_inline void
dpdk_rte_pktmbuf_free (vlib_main_t * vm, u32 thread_index, vlib_buffer_t * b)
{
  vlib_buffer_t *hb = b;
  dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
  dpdk_buffer_per_thread_data *d = vec_elt_at_index (dbm->ptd, thread_index);
  struct rte_mbuf *mb;
  u32 next, flags;
  mb = rte_mbuf_from_vlib_buffer (hb);

next:
  flags = b->flags;
  next = b->next_buffer;
  mb = rte_mbuf_from_vlib_buffer (b);

  if (PREDICT_FALSE (b->n_add_refs))
    {
      rte_mbuf_refcnt_update (mb, b->n_add_refs);
      b->n_add_refs = 0;
    }

  mb = rte_pktmbuf_prefree_seg (mb);
  if (mb)
    {
      if (mb->pool != d->last_pool)
        {
          d->last_pool = mb->pool;
          dpdk_mempool_private_t *privp = rte_mempool_get_priv (d->last_pool);
          d->last_buffer_pool_index = privp->buffer_pool_index;
          vec_validate_aligned (d->mbuf_pending_free_list,
                                d->last_buffer_pool_index,
                                CLIB_CACHE_LINE_BYTES);
        }
      vec_add1 (d->mbuf_pending_free_list[d->last_buffer_pool_index], mb);
    }

  if (flags & VLIB_BUFFER_NEXT_PRESENT)
    {
      b = vlib_get_buffer (vm, next);
      goto next;
    }
}

#ifndef CLIB_MULTIARCH_VARIANT
static void
del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
{
  u32 i;
  vlib_buffer_t *b;
  u32 thread_index = vlib_get_thread_index ();

  for (i = 0; i < vec_len (f->buffers); i++)
    {
      b = vlib_get_buffer (vm, f->buffers[i]);
      dpdk_rte_pktmbuf_free (vm, thread_index, b);
    }

  vec_free (f->name);
  vec_free (f->buffers);
}

/* Add buffer free list. */
static void
dpdk_buffer_delete_free_list (vlib_main_t * vm, u32 free_list_index)
{
  vlib_buffer_main_t *bm = vm->buffer_main;
  vlib_buffer_free_list_t *f;
  u32 merge_index;
  int i;

  ASSERT (vlib_get_thread_index () == 0);

  f = vlib_buffer_get_free_list (vm, free_list_index);

  merge_index = vlib_buffer_get_free_list_with_size (vm, f->n_data_bytes);
  if (merge_index != ~0 && merge_index != free_list_index)
    {
      vlib_buffer_merge_free_lists (pool_elt_at_index
                                    (bm->buffer_free_list_pool, merge_index),
                                    f);
    }

  del_free_list (vm, f);

  /* Poison it. */
  memset (f, 0xab, sizeof (f[0]));

  pool_put (bm->buffer_free_list_pool, f);

  for (i = 1; i < vec_len (vlib_mains); i++)
    {
      bm = vlib_mains[i]->buffer_main;
      f = vlib_buffer_get_free_list (vlib_mains[i], free_list_index);;
      memset (f, 0xab, sizeof (f[0]));
      pool_put (bm->buffer_free_list_pool, f);
    }
}
#endif

/* Make sure free list has at least given number of free buffers. */
uword
CLIB_MULTIARCH_FN (dpdk_buffer_fill_free_list) (vlib_main_t * vm,
                                                vlib_buffer_free_list_t * fl,
                                                uword min_free_buffers)
{
  dpdk_main_t *dm = &dpdk_main;
  vlib_buffer_t *b0, *b1, *b2, *b3;
  int n, i;
  u32 bi0, bi1, bi2, bi3;
  unsigned socket_id = rte_socket_id ();
  struct rte_mempool *rmp = dm->pktmbuf_pools[socket_id];
  dpdk_mempool_private_t *privp = rte_mempool_get_priv (rmp);
  struct rte_mbuf *mb0, *mb1, *mb2, *mb3;
  vlib_buffer_t bt;

  /* Too early? */
  if (PREDICT_FALSE (rmp == 0))
    return 0;

  /* Already have enough free buffers on free list? */
  n = min_free_buffers - vec_len (fl->buffers);
  if (n <= 0)
    return min_free_buffers;

  /* Always allocate round number of buffers. */
  n = round_pow2 (n, CLIB_CACHE_LINE_BYTES / sizeof (u32));

  /* Always allocate new buffers in reasonably large sized chunks. */
  n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);

  vec_validate_aligned (vm->mbuf_alloc_list, n - 1, CLIB_CACHE_LINE_BYTES);

  if (rte_mempool_get_bulk (rmp, vm->mbuf_alloc_list, n) < 0)
    return 0;

  memset (&bt, 0, sizeof (vlib_buffer_t));
  vlib_buffer_init_for_free_list (&bt, fl);
  bt.buffer_pool_index = privp->buffer_pool_index;

  _vec_len (vm->mbuf_alloc_list) = n;

  i = 0;
  int f = vec_len (fl->buffers);
  vec_resize_aligned (fl->buffers, n, CLIB_CACHE_LINE_BYTES);

  while (i < (n - 7))
    {
      vlib_prefetch_buffer_header (vlib_buffer_from_rte_mbuf
                                   (vm->mbuf_alloc_list[i + 4]), STORE);
      vlib_prefetch_buffer_header (vlib_buffer_from_rte_mbuf
                                   (vm->mbuf_alloc_list[i + 5]), STORE);
      vlib_prefetch_buffer_header (vlib_buffer_from_rte_mbuf
                                   (vm->mbuf_alloc_list[i + 6]), STORE);
      vlib_prefetch_buffer_header (vlib_buffer_from_rte_mbuf
                                   (vm->mbuf_alloc_list[i + 7]), STORE);

      mb0 = vm->mbuf_alloc_list[i];
      mb1 = vm->mbuf_alloc_list[i + 1];
      mb2 = vm->mbuf_alloc_list[i + 2];
      mb3 = vm->mbuf_alloc_list[i + 3];

      b0 = vlib_buffer_from_rte_mbuf (mb0);
      b1 = vlib_buffer_from_rte_mbuf (mb1);
      b2 = vlib_buffer_from_rte_mbuf (mb2);
      b3 = vlib_buffer_from_rte_mbuf (mb3);

      bi0 = vlib_get_buffer_index (vm, b0);
      bi1 = vlib_get_buffer_index (vm, b1);
      bi2 = vlib_get_buffer_index (vm, b2);
      bi3 = vlib_get_buffer_index (vm, b3);

      fl->buffers[f++] = bi0;
      fl->buffers[f++] = bi1;
      fl->buffers[f++] = bi2;
      fl->buffers[f++] = bi3;

      clib_memcpy64_x4 (b0, b1, b2, b3, &bt);

      if (fl->buffer_init_function)
        {
          fl->buffer_init_function (vm, fl, &bi0, 1);
          fl->buffer_init_function (vm, fl, &bi1, 1);
          fl->buffer_init_function (vm, fl, &bi2, 1);
          fl->buffer_init_function (vm, fl, &bi3, 1);
        }
      i += 4;
    }

  while (i < n)
    {
      mb0 = vm->mbuf_alloc_list[i];

      b0 = vlib_buffer_from_rte_mbuf (mb0);
      bi0 = vlib_get_buffer_index (vm, b0);

      fl->buffers[f++] = bi0;
      clib_memcpy (b0, &bt, sizeof (vlib_buffer_t));

      if (fl->buffer_init_function)
        fl->buffer_init_function (vm, fl, &bi0, 1);
      i++;
    }

  fl->n_alloc += n;

  return n;
}

static_always_inline void
dpdk_prefetch_buffer_by_index (vlib_main_t * vm, u32 bi)
{
  vlib_buffer_t *b;
  struct rte_mbuf *mb;
  b = vlib_get_buffer (vm, bi);
  mb = rte_mbuf_from_vlib_buffer (b);
  CLIB_PREFETCH (mb, 2 * CLIB_CACHE_LINE_BYTES, STORE);
  CLIB_PREFETCH (b, CLIB_CACHE_LINE_BYTES, LOAD);
}

static_always_inline void
recycle_or_free (vlib_main_t * vm, vlib_buffer_main_t * bm, u32 bi,
                 vlib_buffer_t * b)
{
  vlib_buffer_free_list_t *fl;
  u32 thread_index = vlib_get_thread_index ();
  u32 fi;
  fl = vlib_buffer_get_buffer_free_list (vm, b, &fi);

  /* The only current use of this callback: multicast recycle */
  if (PREDICT_FALSE (fl->buffers_added_to_freelist_function != 0))
    {
      int j;

      vlib_buffer_add_to_free_list (vm, fl, bi,
                                    (b->flags & VLIB_BUFFER_RECYCLE) == 0);

      for (j = 0; j < vec_len (bm->announce_list); j++)
        {
          if (fl == bm->announce_list[j])
            goto already_announced;
        }
      vec_add1 (bm->announce_list, fl);
    already_announced:
      ;
    }
  else
    {
      if (PREDICT_TRUE ((b->flags & VLIB_BUFFER_RECYCLE) == 0))
        dpdk_rte_pktmbuf_free (vm, thread_index, b);
    }
}

static_always_inline void
vlib_buffer_free_inline (vlib_main_t * vm,
                         u32 * buffers, u32 n_buffers, u32 follow_buffer_next)
{
  vlib_buffer_main_t *bm = vm->buffer_main;
  dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
  vlib_buffer_t *b0, *b1, *b2, *b3;
  u32 thread_index = vlib_get_thread_index ();
  dpdk_buffer_per_thread_data *d = vec_elt_at_index (dbm->ptd, thread_index);
  int i = 0;
  u32 (*cb) (vlib_main_t * vm, u32 * buffers, u32 n_buffers,
             u32 follow_buffer_next);

  cb = bm->buffer_free_callback;

  if (PREDICT_FALSE (cb != 0))
    n_buffers = (*cb) (vm, buffers, n_buffers, follow_buffer_next);

  if (!n_buffers)
    return;

  while (i + 7 < n_buffers)
    {
      dpdk_prefetch_buffer_by_index (vm, buffers[i + 4]);
      dpdk_prefetch_buffer_by_index (vm, buffers[i + 5]);
      dpdk_prefetch_buffer_by_index (vm, buffers[i + 6]);
      dpdk_prefetch_buffer_by_index (vm, buffers[i + 7]);

      b0 = vlib_get_buffer (vm, buffers[i]);
      b1 = vlib_get_buffer (vm, buffers[i + 1]);
      b2 = vlib_get_buffer (vm, buffers[i + 2]);
      b3 = vlib_get_buffer (vm, buffers[i + 3]);

      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b2);
      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b3);

      recycle_or_free (vm, bm, buffers[i], b0);
      recycle_or_free (vm, bm, buffers[i + 1], b1);
      recycle_or_free (vm, bm, buffers[i + 2], b2);
      recycle_or_free (vm, bm, buffers[i + 3], b3);

      i += 4;
    }
  while (i < n_buffers)
    {
      b0 = vlib_get_buffer (vm, buffers[i]);
      VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
      recycle_or_free (vm, bm, buffers[i], b0);
      i++;
    }
  if (vec_len (bm->announce_list))
    {
      vlib_buffer_free_list_t *fl;
      for (i = 0; i < vec_len (bm->announce_list); i++)
        {
          fl = bm->announce_list[i];
          fl->buffers_added_to_freelist_function (vm, fl);
        }
      _vec_len (bm->announce_list) = 0;
    }

  vec_foreach_index (i, d->mbuf_pending_free_list)
  {
    int len = vec_len (d->mbuf_pending_free_list[i]);
    if (len)
      {
        rte_mempool_put_bulk (d->mbuf_pending_free_list[i][len - 1]->pool,
                              (void *) d->mbuf_pending_free_list[i], len);
        vec_reset_length (d->mbuf_pending_free_list[i]);
      }
  }
}

void
CLIB_MULTIARCH_FN (dpdk_buffer_free) (vlib_main_t * vm, u32 * buffers,
                                      u32 n_buffers)
{
  vlib_buffer_free_inline (vm, buffers, n_buffers,      /* follow_buffer_next */
                           1);
}

void
CLIB_MULTIARCH_FN (dpdk_buffer_free_no_next) (vlib_main_t * vm, u32 * buffers,
                                              u32 n_buffers)
{
  vlib_buffer_free_inline (vm, buffers, n_buffers,      /* follow_buffer_next */
                           0);
}

#ifndef CLIB_MULTIARCH_VARIANT
static void
dpdk_packet_template_init (vlib_main_t * vm,
                           void *vt,
                           void *packet_data,
                           uword n_packet_data_bytes,
                           uword min_n_buffers_each_physmem_alloc, u8 * name)
{
  vlib_packet_template_t *t = (vlib_packet_template_t *) vt;

  vlib_worker_thread_barrier_sync (vm);
  memset (t, 0, sizeof (t[0]));

  vec_add (t->packet_data, packet_data, n_packet_data_bytes);

  vlib_worker_thread_barrier_release (vm);
}

clib_error_t *
dpdk_pool_create (vlib_main_t * vm, u8 * pool_name, u32 elt_size,
                  u32 num_elts, u32 pool_priv_size, u16 cache_size, u8 numa,
                  struct rte_mempool **_mp, vlib_physmem_region_index_t * pri)
{
  struct rte_mempool *mp;
  vlib_physmem_region_t *pr;
  clib_error_t *error = 0;
  u32 size, obj_size;
  i32 ret;

  obj_size = rte_mempool_calc_obj_size (elt_size, 0, 0);
#if RTE_VERSION < RTE_VERSION_NUM(17, 11, 0, 0)
  size = rte_mempool_xmem_size (num_elts, obj_size, 21);
#else
  size = rte_mempool_xmem_size (num_elts, obj_size, 21, 0);
#endif

  error =
    vlib_physmem_region_alloc (vm, (i8 *) pool_name, size, numa, 0, pri);
  if (error)
    return error;

  pr = vlib_physmem_get_region (vm, pri[0]);

  mp =
    rte_mempool_create_empty ((i8 *) pool_name, num_elts, elt_size,
                              512, pool_priv_size, numa, 0);
  if (!mp)
    return clib_error_return (0, "failed to create %s", pool_name);

  rte_mempool_set_ops_byname (mp, RTE_MBUF_DEFAULT_MEMPOOL_OPS, NULL);

#if RTE_VERSION < RTE_VERSION_NUM(17, 11, 0, 0)
  ret =
    rte_mempool_populate_phys_tab (mp, pr->mem, pr->page_table, pr->n_pages,
                                   pr->log2_page_size, NULL, NULL);
#else
  ret =
    rte_mempool_populate_iova_tab (mp, pr->mem, pr->page_table, pr->n_pages,
                                   pr->log2_page_size, NULL, NULL);
#endif
  if (ret != (i32) mp->size)
    {
      rte_mempool_free (mp);
      return clib_error_return (0, "failed to populate %s", pool_name);
    }

  _mp[0] = mp;

  return 0;
}

clib_error_t *
dpdk_buffer_pool_create (vlib_main_t * vm, unsigned num_mbufs,
                         unsigned socket_id)
{
  dpdk_main_t *dm = &dpdk_main;
  struct rte_mempool *rmp;
  dpdk_mempool_private_t priv;
  vlib_physmem_region_index_t pri;
  clib_error_t *error = 0;
  u8 *pool_name;
  u32 elt_size, i;

  vec_validate_aligned (dm->pktmbuf_pools, socket_id, CLIB_CACHE_LINE_BYTES);

  /* pool already exists, nothing to do */
  if (dm->pktmbuf_pools[socket_id])
    return 0;

  pool_name = format (0, "dpdk_mbuf_pool_socket%u%c", socket_id, 0);

  elt_size = sizeof (struct rte_mbuf) +
    VLIB_BUFFER_HDR_SIZE /* priv size */  +
    VLIB_BUFFER_PRE_DATA_SIZE + VLIB_BUFFER_DATA_SIZE;  /*data room size */

  error =
    dpdk_pool_create (vm, pool_name, elt_size, num_mbufs,
                      sizeof (dpdk_mempool_private_t), 512, socket_id,
                      &rmp, &pri);

  vec_free (pool_name);

  if (!error)
    {
      priv.mbp_priv.mbuf_data_room_size = VLIB_BUFFER_PRE_DATA_SIZE +
        VLIB_BUFFER_DATA_SIZE;
      priv.mbp_priv.mbuf_priv_size = VLIB_BUFFER_HDR_SIZE;

      /* call the mempool priv initializer */
      rte_pktmbuf_pool_init (rmp, &priv);

      /* call the object initializers */
      rte_mempool_obj_iter (rmp, rte_pktmbuf_init, 0);

      dpdk_mempool_private_t *privp = rte_mempool_get_priv (rmp);
      privp->buffer_pool_index = vlib_buffer_add_physmem_region (vm, pri);

      dm->pktmbuf_pools[socket_id] = rmp;

      return 0;
    }

  clib_error_report (error);

  /* no usable pool for this socket, try to use pool from another one */
  for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
    {
      if (dm->pktmbuf_pools[i])
        {
          clib_warning ("WARNING: Failed to allocate mempool for CPU socket "
                        "%u. Threads running on socket %u will use socket %u "
                        "mempool.", socket_id, socket_id, i);
          dm->pktmbuf_pools[socket_id] = dm->pktmbuf_pools[i];
          return 0;
        }
    }

  return clib_error_return (0, "failed to allocate mempool on socket %u",
                            socket_id);
}

#if CLIB_DEBUG > 0

u32 *vlib_buffer_state_validation_lock;
uword *vlib_buffer_state_validation_hash;
void *vlib_buffer_state_heap;

static clib_error_t *
buffer_state_validation_init (vlib_main_t * vm)
{
  void *oldheap;

  vlib_buffer_state_heap = mheap_alloc (0, 10 << 20);

  oldheap = clib_mem_set_heap (vlib_buffer_state_heap);

  vlib_buffer_state_validation_hash = hash_create (0, sizeof (uword));
  vec_validate_aligned (vlib_buffer_state_validation_lock, 0,
                        CLIB_CACHE_LINE_BYTES);
  clib_mem_set_heap (oldheap);
  return 0;
}

VLIB_INIT_FUNCTION (buffer_state_validation_init);
#endif

#if CLI_DEBUG
struct dpdk_validate_buf_result
{
  u32 invalid;
  u32 uninitialized;
};

#define DPDK_TRAJECTORY_POISON 31

static void
dpdk_buffer_validate_trajectory (struct rte_mempool *mp, void *opaque,
                                 void *obj, unsigned obj_idx)
{
  vlib_buffer_t *b;
  struct dpdk_validate_buf_result *counter = opaque;
  b = vlib_buffer_from_rte_mbuf ((struct rte_mbuf *) obj);
  if (b->pre_data[0] != 0)
    {
      if (b->pre_data[0] == DPDK_TRAJECTORY_POISON)
        counter->uninitialized++;
      else
        counter->invalid++;
    }
}

int
dpdk_buffer_validate_trajectory_all (u32 * uninitialized)
{
  dpdk_main_t *dm = &dpdk_main;
  struct dpdk_validate_buf_result counter = { 0 };
  int i;

  for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
    rte_mempool_obj_iter (dm->pktmbuf_pools[i],
                          dpdk_buffer_validate_trajectory, &counter);
  if (uninitialized)
    *uninitialized = counter.uninitialized;
  return counter.invalid;
}

static void
dpdk_buffer_poison_trajectory (struct rte_mempool *mp, void *opaque,
                               void *obj, unsigned obj_idx)
{
  vlib_buffer_t *b;
  b = vlib_buffer_from_rte_mbuf ((struct rte_mbuf *) obj);
  b->pre_data[0] = DPDK_TRAJECTORY_POISON;
}

void
dpdk_buffer_poison_trajectory_all (void)
{
  dpdk_main_t *dm = &dpdk_main;
  int i;

  for (i = 0; i < vec_len (dm->pktmbuf_pools); i++)
    rte_mempool_obj_iter (dm->pktmbuf_pools[i], dpdk_buffer_poison_trajectory,
                          0);
}
#endif

static clib_error_t *
dpdk_buffer_init (vlib_main_t * vm)
{
  dpdk_buffer_main_t *dbm = &dpdk_buffer_main;
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  vec_validate_aligned (dbm->ptd, tm->n_vlib_mains - 1,
                        CLIB_CACHE_LINE_BYTES);
  return 0;
}

VLIB_INIT_FUNCTION (dpdk_buffer_init);

/* *INDENT-OFF* */
VLIB_BUFFER_REGISTER_CALLBACKS (dpdk, static) = {
  .vlib_buffer_fill_free_list_cb = &dpdk_buffer_fill_free_list,
  .vlib_buffer_free_cb = &dpdk_buffer_free,
  .vlib_buffer_free_no_next_cb = &dpdk_buffer_free_no_next,
  .vlib_packet_template_init_cb = &dpdk_packet_template_init,
  .vlib_buffer_delete_free_list_cb = &dpdk_buffer_delete_free_list,
};
/* *INDENT-ON* */

#if __x86_64__
vlib_buffer_fill_free_list_cb_t __clib_weak dpdk_buffer_fill_free_list_avx512;
vlib_buffer_fill_free_list_cb_t __clib_weak dpdk_buffer_fill_free_list_avx2;
vlib_buffer_free_cb_t __clib_weak dpdk_buffer_free_avx512;
vlib_buffer_free_cb_t __clib_weak dpdk_buffer_free_avx2;
vlib_buffer_free_no_next_cb_t __clib_weak dpdk_buffer_free_no_next_avx512;
vlib_buffer_free_no_next_cb_t __clib_weak dpdk_buffer_free_no_next_avx2;

static void __clib_constructor
dpdk_input_multiarch_select (void)
{
  vlib_buffer_callbacks_t *cb = &__dpdk_buffer_callbacks;
  if (dpdk_buffer_fill_free_list_avx512 && clib_cpu_supports_avx512f ())
    {
      cb->vlib_buffer_fill_free_list_cb = dpdk_buffer_fill_free_list_avx512;
      cb->vlib_buffer_free_cb = dpdk_buffer_free_avx512;
      cb->vlib_buffer_free_no_next_cb = dpdk_buffer_free_no_next_avx512;
    }
  else if (dpdk_buffer_fill_free_list_avx2 && clib_cpu_supports_avx2 ())
    {
      cb->vlib_buffer_fill_free_list_cb = dpdk_buffer_fill_free_list_avx2;
      cb->vlib_buffer_free_cb = dpdk_buffer_free_avx2;
      cb->vlib_buffer_free_no_next_cb = dpdk_buffer_free_no_next_avx2;
    }
}
#endif
#endif

/** @endcond */
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */