vlib: add buffer and thread callbacks

Change-Id: I8e2e8f94a884ab2f9909d0c83ba00edd38cdab77
Signed-off-by: Damjan Marion <damarion@cisco.com>

7 files changed, 827 insertions, 10 deletions

diff --git a/src/vnet/devices/dpdk/buffer.c b/src/vnet/devices/dpdk/buffer.c
new file mode 100644
index 00000000000..214a916263c
--- /dev/null
+++ b/src/vnet/devices/dpdk/buffer.c
@@ -0,0 +1,729 @@
+/*
+ * 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 <vnet/devices/dpdk/dpdk.h>
+#include <vnet/devices/dpdk/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");
+
+#define BUFFERS_PER_COPY (sizeof (vlib_copy_unit_t) / sizeof (u32))
+
+/* Make sure we have at least given number of unaligned buffers. */
+static void
+fill_unaligned (vlib_main_t * vm,
+		vlib_buffer_free_list_t * free_list,
+		uword n_unaligned_buffers)
+{
+  word la = vec_len (free_list->aligned_buffers);
+  word lu = vec_len (free_list->unaligned_buffers);
+
+  /* Aligned come in aligned copy-sized chunks. */
+  ASSERT (la % BUFFERS_PER_COPY == 0);
+
+  ASSERT (la >= n_unaligned_buffers);
+
+  while (lu < n_unaligned_buffers)
+    {
+      /* Copy 4 buffers from end of aligned vector to unaligned vector. */
+      vec_add (free_list->unaligned_buffers,
+	       free_list->aligned_buffers + la - BUFFERS_PER_COPY,
+	       BUFFERS_PER_COPY);
+      la -= BUFFERS_PER_COPY;
+      lu += BUFFERS_PER_COPY;
+    }
+  _vec_len (free_list->aligned_buffers) = la;
+}
+
+/* After free aligned buffers may not contain even sized chunks. */
+static void
+trim_aligned (vlib_buffer_free_list_t * f)
+{
+  uword l, n_trim;
+
+  /* Add unaligned to aligned before trim. */
+  l = vec_len (f->unaligned_buffers);
+  if (l > 0)
+    {
+      vec_add_aligned (f->aligned_buffers, f->unaligned_buffers, l,
+		       /* align */ sizeof (vlib_copy_unit_t));
+
+      _vec_len (f->unaligned_buffers) = 0;
+    }
+
+  /* Remove unaligned buffers from end of aligned vector and save for next trim. */
+  l = vec_len (f->aligned_buffers);
+  n_trim = l % BUFFERS_PER_COPY;
+  if (n_trim)
+    {
+      /* Trim aligned -> unaligned. */
+      vec_add (f->unaligned_buffers, f->aligned_buffers + l - n_trim, n_trim);
+
+      /* Remove from aligned. */
+      _vec_len (f->aligned_buffers) = l - n_trim;
+    }
+}
+
+static void
+merge_free_lists (vlib_buffer_free_list_t * dst,
+		  vlib_buffer_free_list_t * src)
+{
+  uword l;
+  u32 *d;
+
+  trim_aligned (src);
+  trim_aligned (dst);
+
+  l = vec_len (src->aligned_buffers);
+  if (l > 0)
+    {
+      vec_add2_aligned (dst->aligned_buffers, d, l,
+			/* align */ sizeof (vlib_copy_unit_t));
+      clib_memcpy (d, src->aligned_buffers, l * sizeof (d[0]));
+      vec_free (src->aligned_buffers);
+    }
+
+  l = vec_len (src->unaligned_buffers);
+  if (l > 0)
+    {
+      vec_add (dst->unaligned_buffers, src->unaligned_buffers, l);
+      vec_free (src->unaligned_buffers);
+    }
+}
+
+always_inline u32
+dpdk_buffer_get_free_list_with_size (vlib_main_t * vm, u32 size)
+{
+  vlib_buffer_main_t *bm = vm->buffer_main;
+
+  size = vlib_buffer_round_size (size);
+  uword *p = hash_get (bm->free_list_by_size, size);
+  return p ? p[0] : ~0;
+}
+
+static void
+del_free_list (vlib_main_t * vm, vlib_buffer_free_list_t * f)
+{
+  u32 i;
+  struct rte_mbuf *mb;
+  vlib_buffer_t *b;
+
+  for (i = 0; i < vec_len (f->unaligned_buffers); i++)
+    {
+      b = vlib_get_buffer (vm, f->unaligned_buffers[i]);
+      mb = rte_mbuf_from_vlib_buffer (b);
+      ASSERT (rte_mbuf_refcnt_read (mb) == 1);
+      rte_pktmbuf_free (mb);
+    }
+  for (i = 0; i < vec_len (f->aligned_buffers); i++)
+    {
+      b = vlib_get_buffer (vm, f->aligned_buffers[i]);
+      mb = rte_mbuf_from_vlib_buffer (b);
+      ASSERT (rte_mbuf_refcnt_read (mb) == 1);
+      rte_pktmbuf_free (mb);
+    }
+  vec_free (f->name);
+  vec_free (f->unaligned_buffers);
+  vec_free (f->aligned_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 (os_get_cpu_number () == 0);
+
+  f = vlib_buffer_get_free_list (vm, free_list_index);
+
+  merge_index = dpdk_buffer_get_free_list_with_size (vm, f->n_data_bytes);
+  if (merge_index != ~0 && merge_index != free_list_index)
+    {
+      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);
+    }
+}
+
+/* Make sure free list has at least given number of free buffers. */
+static uword
+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 *b;
+  int n, i;
+  u32 bi;
+  u32 n_remaining = 0, n_alloc = 0;
+  unsigned socket_id = rte_socket_id ();
+  struct rte_mempool *rmp = dm->pktmbuf_pools[socket_id];
+  struct rte_mbuf *mb;
+
+  /* Too early? */
+  if (PREDICT_FALSE (rmp == 0))
+    return 0;
+
+  trim_aligned (fl);
+
+  /* Already have enough free buffers on free list? */
+  n = min_free_buffers - vec_len (fl->aligned_buffers);
+  if (n <= 0)
+    return min_free_buffers;
+
+  /* Always allocate round number of buffers. */
+  n = round_pow2 (n, BUFFERS_PER_COPY);
+
+  /* Always allocate new buffers in reasonably large sized chunks. */
+  n = clib_max (n, fl->min_n_buffers_each_physmem_alloc);
+
+  vec_validate (vm->mbuf_alloc_list, n - 1);
+
+  if (rte_mempool_get_bulk (rmp, vm->mbuf_alloc_list, n) < 0)
+    return 0;
+
+  _vec_len (vm->mbuf_alloc_list) = n;
+
+  for (i = 0; i < n; i++)
+    {
+      mb = vm->mbuf_alloc_list[i];
+
+      ASSERT (rte_mbuf_refcnt_read (mb) == 0);
+      rte_mbuf_refcnt_set (mb, 1);
+
+      b = vlib_buffer_from_rte_mbuf (mb);
+      bi = vlib_get_buffer_index (vm, b);
+
+      vec_add1_aligned (fl->aligned_buffers, bi, sizeof (vlib_copy_unit_t));
+      n_alloc++;
+      n_remaining--;
+
+      vlib_buffer_init_for_free_list (b, fl);
+
+      if (fl->buffer_init_function)
+	fl->buffer_init_function (vm, fl, &bi, 1);
+    }
+
+  fl->n_alloc += n;
+
+  return n;
+}
+
+always_inline uword
+copy_alignment (u32 * x)
+{
+  return (pointer_to_uword (x) / sizeof (x[0])) % BUFFERS_PER_COPY;
+}
+
+static u32
+alloc_from_free_list (vlib_main_t * vm,
+		      vlib_buffer_free_list_t * free_list,
+		      u32 * alloc_buffers, u32 n_alloc_buffers)
+{
+  u32 *dst, *u_src;
+  uword u_len, n_left;
+  uword n_unaligned_start, n_unaligned_end, n_filled;
+
+  n_left = n_alloc_buffers;
+  dst = alloc_buffers;
+  n_unaligned_start = ((BUFFERS_PER_COPY - copy_alignment (dst))
+		       & (BUFFERS_PER_COPY - 1));
+
+  n_filled = fill_free_list (vm, free_list, n_alloc_buffers);
+  if (n_filled == 0)
+    return 0;
+
+  n_left = n_filled < n_left ? n_filled : n_left;
+  n_alloc_buffers = n_left;
+
+  if (n_unaligned_start >= n_left)
+    {
+      n_unaligned_start = n_left;
+      n_unaligned_end = 0;
+    }
+  else
+    n_unaligned_end = copy_alignment (dst + n_alloc_buffers);
+
+  fill_unaligned (vm, free_list, n_unaligned_start + n_unaligned_end);
+
+  u_len = vec_len (free_list->unaligned_buffers);
+  u_src = free_list->unaligned_buffers + u_len - 1;
+
+  if (n_unaligned_start)
+    {
+      uword n_copy = n_unaligned_start;
+      if (n_copy > n_left)
+	n_copy = n_left;
+      n_left -= n_copy;
+
+      while (n_copy > 0)
+	{
+	  *dst++ = *u_src--;
+	  n_copy--;
+	  u_len--;
+	}
+
+      /* Now dst should be aligned. */
+      if (n_left > 0)
+	ASSERT (pointer_to_uword (dst) % sizeof (vlib_copy_unit_t) == 0);
+    }
+
+  /* Aligned copy. */
+  {
+    vlib_copy_unit_t *d, *s;
+    uword n_copy;
+
+    if (vec_len (free_list->aligned_buffers) <
+	((n_left / BUFFERS_PER_COPY) * BUFFERS_PER_COPY))
+      abort ();
+
+    n_copy = n_left / BUFFERS_PER_COPY;
+    n_left = n_left % BUFFERS_PER_COPY;
+
+    /* Remove buffers from aligned free list. */
+    _vec_len (free_list->aligned_buffers) -= n_copy * BUFFERS_PER_COPY;
+
+    s = (vlib_copy_unit_t *) vec_end (free_list->aligned_buffers);
+    d = (vlib_copy_unit_t *) dst;
+
+    /* Fast path loop. */
+    while (n_copy >= 4)
+      {
+	d[0] = s[0];
+	d[1] = s[1];
+	d[2] = s[2];
+	d[3] = s[3];
+	n_copy -= 4;
+	s += 4;
+	d += 4;
+      }
+
+    while (n_copy >= 1)
+      {
+	d[0] = s[0];
+	n_copy -= 1;
+	s += 1;
+	d += 1;
+      }
+
+    dst = (void *) d;
+  }
+
+  /* Unaligned copy. */
+  ASSERT (n_unaligned_end == n_left);
+  while (n_left > 0)
+    {
+      *dst++ = *u_src--;
+      n_left--;
+      u_len--;
+    }
+
+  if (!free_list->unaligned_buffers)
+    ASSERT (u_len == 0);
+  else
+    _vec_len (free_list->unaligned_buffers) = u_len;
+
+  return n_alloc_buffers;
+}
+
+/* Allocate a given number of buffers into given array.
+   Returns number actually allocated which will be either zero or
+   number requested. */
+u32
+dpdk_buffer_alloc (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
+{
+  vlib_buffer_main_t *bm = vm->buffer_main;
+
+  return alloc_from_free_list
+    (vm,
+     pool_elt_at_index (bm->buffer_free_list_pool,
+			VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX),
+     buffers, n_buffers);
+}
+
+
+u32
+dpdk_buffer_alloc_from_free_list (vlib_main_t * vm,
+				  u32 * buffers,
+				  u32 n_buffers, u32 free_list_index)
+{
+  vlib_buffer_main_t *bm = vm->buffer_main;
+  vlib_buffer_free_list_t *f;
+  f = pool_elt_at_index (bm->buffer_free_list_pool, free_list_index);
+  return alloc_from_free_list (vm, f, buffers, n_buffers);
+}
+
+always_inline void
+add_buffer_to_free_list (vlib_main_t * vm,
+			 vlib_buffer_free_list_t * f,
+			 u32 buffer_index, u8 do_init)
+{
+  vlib_buffer_t *b;
+  b = vlib_get_buffer (vm, buffer_index);
+  if (PREDICT_TRUE (do_init))
+    vlib_buffer_init_for_free_list (b, f);
+  vec_add1_aligned (f->aligned_buffers, buffer_index,
+		    sizeof (vlib_copy_unit_t));
+}
+
+always_inline vlib_buffer_free_list_t *
+buffer_get_free_list (vlib_main_t * vm, vlib_buffer_t * b, u32 * index)
+{
+  vlib_buffer_main_t *bm = vm->buffer_main;
+  u32 i;
+
+  *index = i = b->free_list_index;
+  return pool_elt_at_index (bm->buffer_free_list_pool, i);
+}
+
+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;
+  vlib_buffer_free_list_t *fl;
+  u32 fi;
+  int i;
+  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;
+
+  for (i = 0; i < n_buffers; i++)
+    {
+      vlib_buffer_t *b;
+      struct rte_mbuf *mb;
+
+      b = vlib_get_buffer (vm, buffers[i]);
+
+      fl = buffer_get_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;
+
+	  add_buffer_to_free_list
+	    (vm, fl, buffers[i], (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))
+	    {
+	      mb = rte_mbuf_from_vlib_buffer (b);
+	      ASSERT (rte_mbuf_refcnt_read (mb) == 1);
+	      rte_pktmbuf_free (mb);
+	    }
+	}
+    }
+  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;
+    }
+}
+
+static void
+dpdk_buffer_free (vlib_main_t * vm, u32 * buffers, u32 n_buffers)
+{
+  vlib_buffer_free_inline (vm, buffers, n_buffers,	/* follow_buffer_next */
+			   1);
+}
+
+static void
+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);
+}
+
+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 *
+vlib_buffer_pool_create (vlib_main_t * vm, unsigned num_mbufs,
+			 unsigned socket_id)
+{
+  dpdk_main_t *dm = &dpdk_main;
+  vlib_physmem_main_t *vpm = &vm->physmem_main;
+  struct rte_mempool *rmp;
+  int 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;
+
+  u8 *pool_name = format (0, "mbuf_pool_socket%u%c", socket_id, 0);
+
+  rmp = rte_pktmbuf_pool_create ((char *) pool_name,	/* pool name */
+				 num_mbufs,	/* number of mbufs */
+				 512,	/* cache size */
+				 VLIB_BUFFER_HDR_SIZE,	/* priv size */
+				 VLIB_BUFFER_PRE_DATA_SIZE + VLIB_BUFFER_DATA_SIZE,	/* dataroom size */
+				 socket_id);	/* cpu socket */
+
+  if (rmp)
+    {
+      {
+	uword this_pool_end;
+	uword this_pool_start;
+	uword this_pool_size;
+	uword save_vpm_start, save_vpm_end, save_vpm_size;
+	struct rte_mempool_memhdr *memhdr;
+
+	this_pool_start = ~0ULL;
+	this_pool_end = 0LL;
+
+	STAILQ_FOREACH (memhdr, &rmp->mem_list, next)
+	{
+	  if (((uword) (memhdr->addr + memhdr->len)) > this_pool_end)
+	    this_pool_end = (uword) (memhdr->addr + memhdr->len);
+	  if (((uword) memhdr->addr) < this_pool_start)
+	    this_pool_start = (uword) (memhdr->addr);
+	}
+	ASSERT (this_pool_start < ~0ULL && this_pool_end > 0);
+	this_pool_size = this_pool_end - this_pool_start;
+
+	if (CLIB_DEBUG > 1)
+	  {
+	    clib_warning ("%s: pool start %llx pool end %llx pool size %lld",
+			  pool_name, this_pool_start, this_pool_end,
+			  this_pool_size);
+	    clib_warning
+	      ("before: virtual.start %llx virtual.end %llx virtual.size %lld",
+	       vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
+	  }
+
+	save_vpm_start = vpm->virtual.start;
+	save_vpm_end = vpm->virtual.end;
+	save_vpm_size = vpm->virtual.size;
+
+	if ((this_pool_start < vpm->virtual.start) || vpm->virtual.start == 0)
+	  vpm->virtual.start = this_pool_start;
+	if (this_pool_end > vpm->virtual.end)
+	  vpm->virtual.end = this_pool_end;
+
+	vpm->virtual.size = vpm->virtual.end - vpm->virtual.start;
+
+	if (CLIB_DEBUG > 1)
+	  {
+	    clib_warning
+	      ("after: virtual.start %llx virtual.end %llx virtual.size %lld",
+	       vpm->virtual.start, vpm->virtual.end, vpm->virtual.size);
+	  }
+
+	/* check if fits into buffer index range */
+	if ((u64) vpm->virtual.size >
+	    ((u64) 1 << (32 + CLIB_LOG2_CACHE_LINE_BYTES)))
+	  {
+	    clib_warning ("physmem: virtual size out of range!");
+	    vpm->virtual.start = save_vpm_start;
+	    vpm->virtual.end = save_vpm_end;
+	    vpm->virtual.size = save_vpm_size;
+	    rmp = 0;
+	  }
+      }
+      if (rmp)
+	{
+	  dm->pktmbuf_pools[socket_id] = rmp;
+	  vec_free (pool_name);
+	  return 0;
+	}
+    }
+
+  vec_free (pool_name);
+
+  /* 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
+
+static vlib_buffer_callbacks_t callbacks = {
+  .vlib_buffer_alloc_cb = &dpdk_buffer_alloc,
+  .vlib_buffer_alloc_from_free_list_cb = &dpdk_buffer_alloc_from_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,
+};
+
+static clib_error_t *
+dpdk_buffer_init (vlib_main_t * vm)
+{
+  vlib_buffer_cb_register (vm, &callbacks);
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (dpdk_buffer_init);
+
+/** @endcond */
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vnet/devices/dpdk/cli.c b/src/vnet/devices/dpdk/cli.c
index 538a00fd975..22bd4b4fa23 100644
--- a/src/vnet/devices/dpdk/cli.c
+++ b/src/vnet/devices/dpdk/cli.c
@@ -164,9 +164,9 @@ show_dpdk_buffer (vlib_main_t * vm, unformat_input_t * input,
   struct rte_mempool *rmp;
   int i;
 
-  for (i = 0; i < vec_len (vm->buffer_main->pktmbuf_pools); i++)
+  for (i = 0; i < vec_len (dpdk_main.pktmbuf_pools); i++)
     {
-      rmp = vm->buffer_main->pktmbuf_pools[i];
+      rmp = dpdk_main.pktmbuf_pools[i];
       if (rmp)
 	{
 	  unsigned count = rte_mempool_avail_count (rmp);
diff --git a/src/vnet/devices/dpdk/device.c b/src/vnet/devices/dpdk/device.c
index b22fbf2e69e..0deab6aa2a9 100644
--- a/src/vnet/devices/dpdk/device.c
+++ b/src/vnet/devices/dpdk/device.c
@@ -87,19 +87,18 @@ dpdk_set_mc_filter (vnet_hw_interface_t * hi,
 struct rte_mbuf *
 dpdk_replicate_packet_mb (vlib_buffer_t * b)
 {
-  vlib_main_t *vm = vlib_get_main ();
-  vlib_buffer_main_t *bm = vm->buffer_main;
+  dpdk_main_t *dm = &dpdk_main;
   struct rte_mbuf **mbufs = 0, *s, *d;
   u8 nb_segs;
   unsigned socket_id = rte_socket_id ();
   int i;
 
-  ASSERT (bm->pktmbuf_pools[socket_id]);
+  ASSERT (dm->pktmbuf_pools[socket_id]);
   s = rte_mbuf_from_vlib_buffer (b);
   nb_segs = s->nb_segs;
   vec_validate (mbufs, nb_segs - 1);
 
-  if (rte_pktmbuf_alloc_bulk (bm->pktmbuf_pools[socket_id], mbufs, nb_segs))
+  if (rte_pktmbuf_alloc_bulk (dm->pktmbuf_pools[socket_id], mbufs, nb_segs))
     {
       vec_free (mbufs);
       return 0;
diff --git a/src/vnet/devices/dpdk/dpdk.h b/src/vnet/devices/dpdk/dpdk.h
index e0436031df7..066ec6fadbf 100644
--- a/src/vnet/devices/dpdk/dpdk.h
+++ b/src/vnet/devices/dpdk/dpdk.h
@@ -425,6 +425,9 @@ typedef struct
   vlib_main_t *vlib_main;
   vnet_main_t *vnet_main;
   dpdk_config_main_t *conf;
+
+  /* mempool */
+  struct rte_mempool **pktmbuf_pools;
 } dpdk_main_t;
 
 dpdk_main_t dpdk_main;
diff --git a/src/vnet/devices/dpdk/dpdk_priv.h b/src/vnet/devices/dpdk/dpdk_priv.h
index 0c81dbc3beb..dd40ff48510 100644
--- a/src/vnet/devices/dpdk/dpdk_priv.h
+++ b/src/vnet/devices/dpdk/dpdk_priv.h
@@ -13,6 +13,9 @@
  * limitations under the License.
  */
 
+#define rte_mbuf_from_vlib_buffer(x) (((struct rte_mbuf *)x) - 1)
+#define vlib_buffer_from_rte_mbuf(x) ((vlib_buffer_t *)(x+1))
+
 #define DPDK_NB_RX_DESC_DEFAULT   1024
 #define DPDK_NB_TX_DESC_DEFAULT   1024
 #define DPDK_NB_RX_DESC_VIRTIO    256
diff --git a/src/vnet/devices/dpdk/init.c b/src/vnet/devices/dpdk/init.c
index 60689463492..4c040d20af7 100755
--- a/src/vnet/devices/dpdk/init.c
+++ b/src/vnet/devices/dpdk/init.c
@@ -64,8 +64,6 @@ static struct rte_eth_conf port_conf_template = {
 clib_error_t *
 dpdk_port_setup (dpdk_main_t * dm, dpdk_device_t * xd)
 {
-  vlib_main_t *vm = vlib_get_main ();
-  vlib_buffer_main_t *bm = vm->buffer_main;
   int rv;
   int j;
 
@@ -107,7 +105,7 @@ dpdk_port_setup (dpdk_main_t * dm, dpdk_device_t * xd)
 
       rv = rte_eth_rx_queue_setup (xd->device_index, j, xd->nb_rx_desc,
 				   xd->cpu_socket, 0,
-				   bm->
+				   dm->
 				   pktmbuf_pools[xd->cpu_socket_id_by_queue
 						 [j]]);
 
@@ -115,7 +113,7 @@ dpdk_port_setup (dpdk_main_t * dm, dpdk_device_t * xd)
       if (rv < 0)
 	rv = rte_eth_rx_queue_setup (xd->device_index, j, xd->nb_rx_desc,
 				     SOCKET_ID_ANY, 0,
-				     bm->
+				     dm->
 				     pktmbuf_pools[xd->cpu_socket_id_by_queue
 						   [j]]);
       if (rv < 0)
diff --git a/src/vnet/devices/dpdk/thread.c b/src/vnet/devices/dpdk/thread.c
new file mode 100644
index 00000000000..475dd142157
--- /dev/null
+++ b/src/vnet/devices/dpdk/thread.c
@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+#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 <vnet/devices/dpdk/dpdk.h>
+#include <vnet/devices/dpdk/dpdk_priv.h>
+
+static clib_error_t *
+dpdk_launch_thread (void *fp, vlib_worker_thread_t * w, unsigned lcore_id)
+{
+  int r;
+  r = rte_eal_remote_launch (fp, (void *) w, lcore_id);
+  if (r)
+    return clib_error_return (0, "Failed to launch thread %u", lcore_id);
+  return 0;
+}
+
+static clib_error_t *
+dpdk_thread_set_lcore (u32 thread, u16 lcore)
+{
+  return 0;
+}
+
+static vlib_thread_callbacks_t callbacks = {
+  .vlib_launch_thread_cb = &dpdk_launch_thread,
+  .vlib_thread_set_lcore_cb = &dpdk_thread_set_lcore,
+};
+
+static clib_error_t *
+dpdk_thread_init (vlib_main_t * vm)
+{
+  vlib_thread_cb_register (vm, &callbacks);
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (dpdk_thread_init);
+
+/** @endcond */
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */