index : vpp	master stable/1606 stable/1609 stable/1701 stable/1704 stable/1707 stable/1710 stable/1801 stable/1804 stable/1807 stable/1810 stable/1901 stable/1904 stable/1908 stable/2001 stable/2005 stable/2009 stable/2101 stable/2106 stable/2110 stable/2202 stable/2206 stable/2210 stable/2302 stable/2306 stable/2310 stable/2402 stable/2406 stable/2410 stable/test
	Vector Packet Processing	Grokmirror user

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path: root/test/vpp_ip_route.py

Age	Commit message (Expand)	Author	Files	Lines
2019-11-26	fib: Fix crash on cover update to non activated adj source	Neale Ranns	1	-0/+1
2019-11-26	fib: Table Replace	Neale Ranns	1	-4/+46
2019-11-15	tests: Remove the unrequired VPP IP address/prefix class wrappers	Neale Ranns	1	-38/+38
2019-09-19	api: split vl_api_prefix into two	Ole Troan	1	-1/+1
2019-08-20	api: Cleanup APIs interface.api	Jakub Grajciar	1	-4/+2
2019-07-24	fib: Support the POP of a Psuedo Wire Control Word	Neale Ranns	1	-0/+1
2019-07-03	fib: allow route delete with no paths and multipath=0 to remove the	Neale Ranns	1	-8/+22
2019-06-26	tests: set object_id for routes.	Paul Vinciguerra	1	-5/+8
2019-06-18	fib: fib api updates	Neale Ranns	1	-308/+280
2019-06-06	IP-Punt-redirect: allow the use of a FIB path to describe how to	Neale Ranns	1	-3/+6
2019-03-29	tests: refactor vpp_object.py	Paul Vinciguerra	1	-24/+0
2019-03-15	Revert "API: Cleanup APIs interface.api"	Ole Trøan	1	-2/+4
2019-03-15	API: Cleanup APIs interface.api	Jakub Grajciar	1	-4/+2
2019-03-11	vpp_papi_provider: Remove more wrapper functions.	Ole Troan	1	-59/+58
2019-03-06	test framework: vpp_papi_provider.py - further cleanup	Ole Troan	1	-29/+21
2019-03-01	Tests: Trivial fox use of 'is'.	Paul Vinciguerra	1	-1/+1
2019-03-01	Tests: Remove all wildcard imports.	Paul Vinciguerra	1	-2/+2
2019-02-28	test/vpp_ip_route.py: Trivial. Remove duplicate key.	Paul Vinciguerra	1	-1/+0
2019-01-25	IPSEC: tests use opbject registry	Neale Ranns	1	-1/+1
2019-01-23	IP route local and connected	Neale Ranns	1	-4/+3
2018-12-20	FIB: encode the label stack in the FIB path during table dump	Neale Ranns	1	-8/+52
2018-11-07	GBP Endpoint Learning	Neale Ranns	1	-0/+100
2018-10-01	mroute routers in the stats segment	Neale Ranns	1	-12/+17
2018-09-20	Route counters in the stats segment	Neale Ranns	1	-3/+21
2018-09-14	BIER API and load-balancing fixes	Neale Ranns	1	-0/+3
2018-09-11	GBP Endpoint Updates	Neale Ranns	1	-9/+1
2018-09-07	IP route update fix when multipath and drop set	Neale Ranns	1	-3/+7
2018-07-09	IGMP improvements	Neale Ranns	1	-11/+27
2018-04-17	IP mcast: allow unicast address as a next-hop	Neale Ranns	1	-4/+11
2018-03-20	FIB Interpose Source	Neale Ranns	1	-0/+13
2018-03-09	MPLS Unifom mode	Neale Ranns	1	-6/+38
2018-01-09	DVR: run L3 output features	Neale Ranns	1	-3/+5
2018-01-09	BIER: missing endian swap for imposition object in API return	Neale Ranns	1	-0/+1
2017-11-09	BIER	Neale Ranns	1	-6/+22
2017-11-07	UDP Encapsulation.	Neale Ranns	1	-0/+8
2017-10-14	Source Lookup progammable via API	Neale Ranns	1	-0/+3
2017-10-05	Distributed Virtual Router Support	Neale Ranns	1	-0/+2
2017-09-11	FIB table add/delete API	Neale Ranns	1	-0/+73
2017-08-08	L2 over MPLS	Neale Ranns	1	-7/+17
2017-05-24	Missing VLIB node for IPv6 disposition from mcast MPLS LSP	Neale Ranns	1	-4/+5
2017-04-24	Improve Load-Balance MAPs	Neale Ranns	1	-17/+36
2017-04-07	MPLS Mcast	Neale Ranns	1	-3/+35
2017-03-17	Fix IP feature ordering.	Neale Ranns	1	-0/+17
2017-03-10	Fix MAP-E UT. Add functionality in MAP code to delete the pre-resolved next-h...	Neale Ranns	1	-1/+9
2017-03-09	IMplementation for option to not create a FIB table entry when adding a neigh...	Neale Ranns	1	-34/+44
2017-03-09	Tests to target holes in adjacency and DPO test coverage	Neale Ranns	1	-9/+22
2017-02-20	Python test IP and MPLS objects conform to infra.	Neale Ranns	1	-12/+104
2017-01-27	IP Multicast FIB (mfib)	Neale Ranns	1	-1/+100
2017-01-26	DHCPv[46] proxy tests	Neale Ranns	1	-18/+49
2017-01-11	make test: improve documentation and PEP8 compliance	Klement Sekera	1	-22/+30

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© 2016 FD.io a Linux Foundation Collaborative Project. All Rights Reserved.

Linux Foundation is a registered trademark of The Linux Foundation. Linux is a registered trademark of Linus Torvalds.

Please see our privacy policy and terms of use

/*
 * Copyright (c) 2015 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.
 */
/*
  Copyright (c) 2001-2005 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.
*/

#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/mem.h>
#include <vppinfra/byte_order.h>	/* for clib_arch_is_big_endian */

always_inline void
zero_pair (hash_t * h, hash_pair_t * p)
{
  clib_memset (p, 0, hash_pair_bytes (h));
}

always_inline void
init_pair (hash_t * h, hash_pair_t * p)
{
  clib_memset (p->value, ~0, hash_value_bytes (h));
}

always_inline hash_pair_union_t *
get_pair (void *v, uword i)
{
  hash_t *h = hash_header (v);
  hash_pair_t *p;
  ASSERT (i < vec_len (v));
  p = v;
  p += i << h->log2_pair_size;
  return (hash_pair_union_t *) p;
}

always_inline void
set_is_user (void *v, uword i, uword is_user)
{
  hash_t *h = hash_header (v);
  uword i0 = i / BITS (h->is_user[0]);
  uword i1 = (uword) 1 << (i % BITS (h->is_user[0]));
  if (is_user)
    h->is_user[i0] |= i1;
  else
    h->is_user[i0] &= ~i1;
}

static u8 *hash_format_pair_default (u8 * s, va_list * args);

#if uword_bits == 64

static inline u64
zap64 (u64 x, word n)
{
#define _(n) (((u64) 1 << (u64) (8*(n))) - (u64) 1)
  static u64 masks_little_endian[] = {
    0, _(1), _(2), _(3), _(4), _(5), _(6), _(7),
  };
  static u64 masks_big_endian[] = {
    0, ~_(7), ~_(6), ~_(5), ~_(4), ~_(3), ~_(2), ~_(1),
  };
#undef _
  if (clib_arch_is_big_endian)
    return x & masks_big_endian[n];
  else
    return x & masks_little_endian[n];
}

/**
 * make address-sanitizer skip this:
 * clib_mem_unaligned + zap64 casts its input as u64, computes a mask
 * according to the input length, and returns the casted maked value.
 * Therefore all the 8 Bytes of the u64 are systematically read, which
 * rightfully causes address-sanitizer to raise an error on smaller inputs.
 *
 * However the invalid Bytes are discarded within zap64(), whicj is why
 * this can be silenced safely.
 */
static inline u64 __attribute__ ((no_sanitize_address))
hash_memory64 (void *p, word n_bytes, u64 state)
{
  u64 *q = p;
  u64 a, b, c, n;

  a = b = 0x9e3779b97f4a7c13LL;
  c = state;
  n = n_bytes;

  while (n >= 3 * sizeof (u64))
    {
      a += clib_mem_unaligned (q + 0, u64);
      b += clib_mem_unaligned (q + 1, u64);
      c += clib_mem_unaligned (q + 2, u64);
      hash_mix64 (a, b, c);
      n -= 3 * sizeof (u64);
      q += 3;
    }

  c += n_bytes;
  switch (n / sizeof (u64))
    {
    case 2:
      a += clib_mem_unaligned (q + 0, u64);
      b += clib_mem_unaligned (q + 1, u64);
      if (n % sizeof (u64))
	c += zap64 (clib_mem_unaligned (q + 2, u64), n % sizeof (u64)) << 8;
      break;

    case 1:
      a += clib_mem_unaligned (q + 0, u64);
      if (n % sizeof (u64))
	b += zap64 (clib_mem_unaligned (q + 1, u64), n % sizeof (u64));
      break;

    case 0:
      if (n % sizeof (u64))
	a += zap64 (clib_mem_unaligned (q + 0, u64), n % sizeof (u64));
      break;
    }

  hash_mix64 (a, b, c);

  return c;
}

#else /* if uword_bits == 64 */

static inline u32
zap32 (u32 x, word n)
{
#define _(n) (((u32) 1 << (u32) (8*(n))) - (u32) 1)
  static u32 masks_little_endian[] = {
    0, _(1), _(2), _(3),
  };
  static u32 masks_big_endian[] = {
    0, ~_(3), ~_(2), ~_(1),
  };
#undef _
  if (clib_arch_is_big_endian)
    return x & masks_big_endian[n];
  else
    return x & masks_little_endian[n];
}

static inline u32
hash_memory32 (void *p, word n_bytes, u32 state)
{
  u32 *q = p;
  u32 a, b, c, n;

  a = b = 0x9e3779b9;
  c = state;
  n = n_bytes;

  while (n >= 3 * sizeof (u32))
    {
      a += clib_mem_unaligned (q + 0, u32);
      b += clib_mem_unaligned (q + 1, u32);
      c += clib_mem_unaligned (q + 2, u32);
      hash_mix32 (a, b, c);
      n -= 3 * sizeof (u32);
      q += 3;
    }

  c += n_bytes;
  switch (n / sizeof (u32))
    {
    case 2:
      a += clib_mem_unaligned (q + 0, u32);
      b += clib_mem_unaligned (q + 1, u32);
      if (n % sizeof (u32))
	c += zap32 (clib_mem_unaligned (q + 2, u32), n % sizeof (u32)) << 8;
      break;

    case 1:
      a += clib_mem_unaligned (q + 0, u32);
      if (n % sizeof (u32))
	b += zap32 (clib_mem_unaligned (q + 1, u32), n % sizeof (u32));
      break;

    case 0:
      if (n % sizeof (u32))
	a += zap32 (clib_mem_unaligned (q + 0, u32), n % sizeof (u32));
      break;
    }

  hash_mix32 (a, b, c);

  return c;
}
#endif

uword
hash_memory (void *p, word n_bytes, uword state)
{
  uword *q = p;

#if uword_bits == 64
  return hash_memory64 (q, n_bytes, state);
#else
  return hash_memory32 (q, n_bytes, state);
#endif
}

#if uword_bits == 64
always_inline uword
hash_uword (uword x)
{
  u64 a, b, c;

  a = b = 0x9e3779b97f4a7c13LL;
  c = 0;
  a += x;
  hash_mix64 (a, b, c);
  return c;
}
#else
always_inline uword
hash_uword (uword x)
{
  u32 a, b, c;

  a = b = 0x9e3779b9;
  c = 0;
  a += x;
  hash_mix32 (a, b, c);
  return c;
}
#endif

/* Call sum function.  Hash code will be sum function value
   modulo the prime length of the hash table. */
always_inline uword
key_sum (hash_t * h, uword key)
{
  uword sum;
  switch (pointer_to_uword ((void *) h->key_sum))
    {
    case KEY_FUNC_NONE:
      sum = hash_uword (key);
      break;

    case KEY_FUNC_POINTER_UWORD:
      sum = hash_uword (*uword_to_pointer (key, uword *));
      break;

    case KEY_FUNC_POINTER_U32:
      sum = hash_uword (*uword_to_pointer (key, u32 *));
      break;

    case KEY_FUNC_STRING:
      sum = string_key_sum (h, key);
      break;

    case KEY_FUNC_MEM:
      sum = mem_key_sum (h, key);
      break;

    default:
      sum = h->key_sum (h, key);
      break;
    }

  return sum;
}

always_inline uword
key_equal1 (hash_t * h, uword key1, uword key2, uword e)
{
  switch (pointer_to_uword ((void *) h->key_equal))
    {
    case KEY_FUNC_NONE:
      break;

    case KEY_FUNC_POINTER_UWORD:
      e =
	*uword_to_pointer (key1, uword *) == *uword_to_pointer (key2,
								uword *);
      break;

    case KEY_FUNC_POINTER_U32:
      e = *uword_to_pointer (key1, u32 *) == *uword_to_pointer (key2, u32 *);
      break;

    case KEY_FUNC_STRING:
      e = string_key_equal (h, key1, key2);
      break;

    case KEY_FUNC_MEM:
      e = mem_key_equal (h, key1, key2);
      break;

    default:
      e = h->key_equal (h, key1, key2);
      break;
    }
  return e;
}

/* Compares two keys: returns 1 if equal, 0 if not. */
always_inline uword
key_equal (hash_t * h, uword key1, uword key2)
{
  uword e = key1 == key2;
  if (CLIB_DEBUG > 0 && key1 == key2)
    ASSERT (key_equal1 (h, key1, key2, e));
  if (!e)
    e = key_equal1 (h, key1, key2, e);
  return e;
}

static hash_pair_union_t *
get_indirect (void *v, hash_pair_indirect_t * pi, uword key)
{
  hash_t *h = hash_header (v);
  hash_pair_t *p0, *p1;

  p0 = p1 = pi->pairs;
  if (h->log2_pair_size > 0)
    p1 = hash_forward (h, p0, indirect_pair_get_len (pi));
  else
    p1 += vec_len (p0);

  while (p0 < p1)
    {
      if (key_equal (h, p0->key, key))
	return (hash_pair_union_t *) p0;
      p0 = hash_forward1 (h, p0);
    }

  return (hash_pair_union_t *) 0;
}

static hash_pair_union_t *
set_indirect_is_user (void *v, uword i, hash_pair_union_t * p, uword key)
{
  hash_t *h = hash_header (v);
  hash_pair_t *q;
  hash_pair_indirect_t *pi = &p->indirect;
  uword log2_bytes = 0;

  if (h->log2_pair_size == 0)
    q = vec_new (hash_pair_t, 2);
  else
    {
      log2_bytes = 1 + hash_pair_log2_bytes (h);
      q = clib_mem_alloc (1ULL << log2_bytes);
    }
  clib_memcpy (q, &p->direct, hash_pair_bytes (h));

  pi->pairs = q;
  if (h->log2_pair_size > 0)
    indirect_pair_set (pi, log2_bytes, 2);

  set_is_user (v, i, 0);

  /* First element is used by existing pair, second will be used by caller. */
  q = hash_forward1 (h, q);
  q->key = key;
  init_pair (h, q);
  return (hash_pair_union_t *) q;
}

static hash_pair_union_t *
set_indirect (void *v, hash_pair_indirect_t * pi, uword key,
	      uword * found_key)
{
  hash_t *h = hash_header (v);
  hash_pair_t *new_pair;
  hash_pair_union_t *q;

  q = get_indirect (v, pi, key);
  if (q)
    {
      *found_key = 1;
      return q;
    }

  if (h->log2_pair_size == 0)
    vec_add2 (pi->pairs, new_pair, 1);
  else
    {
      uword len, new_len, log2_bytes;

      len = indirect_pair_get_len (pi);
      log2_bytes = indirect_pair_get_log2_bytes (pi);

      new_len = len + 1;
      if (new_len * hash_pair_bytes (h) > (1ULL << log2_bytes))
	{
	  pi->pairs = clib_mem_realloc (pi->pairs,
					1ULL << (log2_bytes + 1),
					1ULL << log2_bytes);
	  log2_bytes++;
	}

      indirect_pair_set (pi, log2_bytes, new_len);
      new_pair = pi->pairs + (len << h->log2_pair_size);
    }
  new_pair->key = key;
  init_pair (h, new_pair);
  *found_key = 0;
  return (hash_pair_union_t *) new_pair;
}

static void
unset_indirect (void *v, uword i, hash_pair_t * q)
{
  hash_t *h = hash_header (v);
  hash_pair_union_t *p = get_pair (v, i);
  hash_pair_t *e;
  hash_pair_indirect_t *pi = &p->indirect;
  uword len, is_vec;

  is_vec = h->log2_pair_size == 0;

  ASSERT (!hash_is_user (v, i));
  len = is_vec ? vec_len (pi->pairs) : indirect_pair_get_len (pi);
  e = hash_forward (h, pi->pairs, len - 1);
  ASSERT (q >= pi->pairs && q <= e);

  /* We have two or fewer pairs and we are delete one pair.
     Make indirect pointer direct and free indirect memory. */
  if (len <= 2)
    {
      hash_pair_t *r = pi->pairs;

      if (len == 2)
	{
	  clib_memcpy (p, q == r ? hash_forward1 (h, r) : r,
		       hash_pair_bytes (h));
	  set_is_user (v, i, 1);
	}
      else
	zero_pair (h, &p->direct);

      if (is_vec)
	vec_free (r);
      else if (r)
	clib_mem_free (r);
    }
  else
    {
      /* If deleting a pair we need to keep non-null pairs together. */
      if (q < e)
	clib_memcpy (q, e, hash_pair_bytes (h));
      else
	zero_pair (h, q);
      if (is_vec)
	_vec_len (pi->pairs) -= 1;
      else
	indirect_pair_set (pi, indirect_pair_get_log2_bytes (pi), len - 1);
    }
}

enum lookup_opcode
{
  GET = 1,
  SET = 2,
  UNSET = 3,
};

static hash_pair_t *
lookup (void *v, uword key, enum lookup_opcode op,
	void *new_value, void *old_value)
{
  hash_t *h = hash_header (v);
  hash_pair_union_t *p = 0;
  uword found_key = 0;
  uword i;

  if (!v)
    return 0;

  i = key_sum (h, key) & (_vec_len (v) - 1);
  p = get_pair (v, i);

  if (hash_is_user (v, i))
    {
      found_key = key_equal (h, p->direct.key, key);
      if (found_key)
	{
	  if (op == UNSET)
	    {
	      set_is_user (v, i, 0);
	      if (old_value)
		clib_memcpy (old_value, p->direct.value,
			     hash_value_bytes (h));
	      zero_pair (h, &p->direct);
	    }
	}
      else
	{
	  if (op == SET)
	    p = set_indirect_is_user (v, i, p, key);
	  else
	    p = 0;
	}
    }
  else
    {
      hash_pair_indirect_t *pi = &p->indirect;

      if (op == SET)
	{
	  if (!pi->pairs)
	    {
	      p->direct.key = key;
	      set_is_user (v, i, 1);
	    }
	  else
	    p = set_indirect (v, pi, key, &found_key);
	}
      else
	{
	  p = get_indirect (v, pi, key);
	  found_key = p != 0;
	  if (found_key && op == UNSET)
	    {
	      if (old_value)
		clib_memcpy (old_value, &p->direct.value,
			     hash_value_bytes (h));

	      unset_indirect (v, i, &p->direct);

	      /* Nullify p (since it's just been deleted).
	         Otherwise we might be tempted to play with it. */
	      p = 0;
	    }
	}
    }

  if (op == SET && p != 0)
    {
      /* Save away old value for caller. */
      if (old_value && found_key)
	clib_memcpy (old_value, &p->direct.value, hash_value_bytes (h));
      clib_memcpy (&p->direct.value, new_value, hash_value_bytes (h));
    }

  if (op == SET)
    h->elts += !found_key;
  if (op == UNSET)
    h->elts -= found_key;

  return &p->direct;
}

/* Fetch value of key. */
uword *
_hash_get (void *v, uword key)
{
  hash_t *h = hash_header (v);
  hash_pair_t *p;

  /* Don't even search table if its empty. */
  if (!v || h->elts == 0)
    return 0;

  p = lookup (v, key, GET, 0, 0);
  if (!p)
    return 0;
  if (h->log2_pair_size == 0)
    return &p->key;
  else
    return &p->value[0];
}

hash_pair_t *
_hash_get_pair (void *v, uword key)
{
  return lookup (v, key, GET, 0, 0);
}

hash_pair_t *
hash_next (void *v, hash_next_t * hn)
{
  hash_t *h = hash_header (v);
  hash_pair_t *p;

  while (1)
    {
      if (hn->i == 0 && hn->j == 0)
	{
	  /* Save flags. */
	  hn->f = h->flags;

	  /* Prevent others from re-sizing hash table. */
	  h->flags |=
	    (HASH_FLAG_NO_AUTO_GROW
	     | HASH_FLAG_NO_AUTO_SHRINK | HASH_FLAG_HASH_NEXT_IN_PROGRESS);
	}
      else if (hn->i >= hash_capacity (v))
	{
	  /* Restore flags. */
	  h->flags = hn->f;
	  clib_memset (hn, 0, sizeof (hn[0]));
	  return 0;
	}

      p = hash_forward (h, v, hn->i);
      if (hash_is_user (v, hn->i))
	{
	  hn->i++;
	  return p;
	}
      else
	{
	  hash_pair_indirect_t *pi = (void *) p;
	  uword n;

	  if (h->log2_pair_size > 0)
	    n = indirect_pair_get_len (pi);
	  else
	    n = vec_len (pi->pairs);

	  if (hn->j >= n)
	    {
	      hn->i++;
	      hn->j = 0;
	    }
	  else
	    return hash_forward (h, pi->pairs, hn->j++);
	}
    }
}

/* Remove key from table. */
void *
_hash_unset (void *v, uword key, void *old_value)
{
  hash_t *h;

  if (!v)
    return v;

  (void) lookup (v, key, UNSET, 0, old_value);

  h = hash_header (v);
  if (!(h->flags & HASH_FLAG_NO_AUTO_SHRINK))
    {
      /* Resize when 1/4 full. */
      if (h->elts > 32 && 4 * (h->elts + 1) < vec_len (v))
	v = hash_resize (v, vec_len (v) / 2);
    }

  return v;
}

void *
_hash_create (uword elts, hash_t * h_user)
{
  hash_t *h;
  uword log2_pair_size;
  void *v;

  /* Size of hash is power of 2 >= ELTS and larger than
     number of bits in is_user bitmap elements. */
  elts = clib_max (elts, BITS (h->is_user[0]));
  elts = 1ULL << max_log2 (elts);

  log2_pair_size = 1;
  if (h_user)
    log2_pair_size = h_user->log2_pair_size;

  v = _vec_resize ((void *) 0,
		   /* vec len: */ elts,
		   /* data bytes: */
		   (elts << log2_pair_size) * sizeof (hash_pair_t),
		   /* header bytes: */
		   sizeof (h[0]) +
		   (elts / BITS (h->is_user[0])) * sizeof (h->is_user[0]),
		   /* alignment */ sizeof (hash_pair_t));
  h = hash_header (v);

  if (h_user)
    h[0] = h_user[0];

  h->log2_pair_size = log2_pair_size;
  h->elts = 0;

  /* Default flags to never shrinking hash tables.
     Shrinking tables can cause "jackpot" cases. */
  if (!h_user)
    h->flags = HASH_FLAG_NO_AUTO_SHRINK;

  if (!h->format_pair)
    {
      h->format_pair = hash_format_pair_default;
      h->format_pair_arg = 0;
    }

  return v;
}

void *
_hash_free (void *v)
{
  hash_t *h = hash_header (v);
  hash_pair_union_t *p;
  uword i;

  if (!v)
    return v;

  /* We zero all freed memory in case user would be tempted to use it. */
  for (i = 0; i < hash_capacity (v); i++)
    {
      if (hash_is_user (v, i))
	continue;
      p = get_pair (v, i);
      if (h->log2_pair_size == 0)
	vec_free (p->indirect.pairs);
      else if (p->indirect.pairs)
	clib_mem_free (p->indirect.pairs);
    }

  vec_free_header (h);

  return 0;
}

static void *
hash_resize_internal (void *old, uword new_size, uword free_old)
{
  void *new;
  hash_pair_t *p;

  new = 0;
  if (new_size > 0)
    {
      hash_t *h = old ? hash_header (old) : 0;
      new = _hash_create (new_size, h);
      /* *INDENT-OFF* */
      hash_foreach_pair (p, old, {
	new = _hash_set3 (new, p->key, &p->value[0], 0);
      });
      /* *INDENT-ON* */
    }

  if (free_old)
    hash_free (old);
  return new;
}

void *
hash_resize (void *old, uword new_size)
{
  return hash_resize_internal (old, new_size, 1);
}

void *
hash_dup (void *old)
{
  return hash_resize_internal (old, vec_len (old), 0);
}

void *
_hash_set3 (void *v, uword key, void *value, void *old_value)
{
  hash_t *h;

  if (!v)
    v = hash_create (0, sizeof (uword));

  h = hash_header (v);
  (void) lookup (v, key, SET, value, old_value);

  if (!(h->flags & HASH_FLAG_NO_AUTO_GROW))
    {
      /* Resize when 3/4 full. */
      if (4 * (h->elts + 1) > 3 * vec_len (v))
	v = hash_resize (v, 2 * vec_len (v));
    }

  return v;
}

uword
vec_key_sum (hash_t * h, uword key)
{
  void *v = uword_to_pointer (key, void *);
  return hash_memory (v, vec_len (v) * h->user, 0);
}

uword
vec_key_equal (hash_t * h, uword key1, uword key2)
{
  void *v1 = uword_to_pointer (key1, void *);
  void *v2 = uword_to_pointer (key2, void *);
  uword l1 = vec_len (v1);
  uword l2 = vec_len (v2);
  return l1 == l2 && 0 == memcmp (v1, v2, l1 * h->user);
}

u8 *
vec_key_format_pair (u8 * s, va_list * args)
{
  void *CLIB_UNUSED (user_arg) = va_arg (*args, void *);
  void *v = va_arg (*args, void *);
  hash_pair_t *p = va_arg (*args, hash_pair_t *);
  hash_t *h = hash_header (v);
  void *u = uword_to_pointer (p->key, void *);
  int i;

  switch (h->user)
    {
    case 1:
      s = format (s, "%v", u);
      break;

    case 2:
      {
	u16 *w = u;
	for (i = 0; i < vec_len (w); i++)
	  s = format (s, "0x%x, ", w[i]);
	break;
      }

    case 4:
      {
	u32 *w = u;
	for (i = 0; i < vec_len (w); i++)
	  s = format (s, "0x%x, ", w[i]);
	break;
      }

    case 8:
      {
	u64 *w = u;
	for (i = 0; i < vec_len (w); i++)
	  s = format (s, "0x%Lx, ", w[i]);
	break;
      }

    default:
      s = format (s, "0x%U", format_hex_bytes, u, vec_len (u) * h->user);
      break;
    }

  if (hash_value_bytes (h) > 0)
    s = format (s, " -> 0x%wx", p->value[0]);

  return s;
}

uword
mem_key_sum (hash_t * h, uword key)
{
  uword *v = uword_to_pointer (key, void *);
  return hash_memory (v, h->user, 0);
}

uword
mem_key_equal (hash_t * h, uword key1, uword key2)
{
  void *v1 = uword_to_pointer (key1, void *);
  void *v2 = uword_to_pointer (key2, void *);
  return v1 && v2 && 0 == memcmp (v1, v2, h->user);
}

uword
string_key_sum (hash_t * h, uword key)
{
  char *v = uword_to_pointer (key, char *);
  return hash_memory (v, strlen (v), 0);
}

uword
string_key_equal (hash_t * h, uword key1, uword key2)
{
  void *v1 = uword_to_pointer (key1, void *);
  void *v2 = uword_to_pointer (key2, void *);
  return v1 && v2 && 0 == strcmp (v1, v2);
}

u8 *
string_key_format_pair (u8 * s, va_list * args)
{
  void *CLIB_UNUSED (user_arg) = va_arg (*args, void *);
  void *v = va_arg (*args, void *);
  hash_pair_t *p = va_arg (*args, hash_pair_t *);
  hash_t *h = hash_header (v);
  void *u = uword_to_pointer (p->key, void *);

  s = format (s, "%s", u);

  if (hash_value_bytes (h) > 0)
    s =
      format (s, " -> 0x%8U", format_hex_bytes, &p->value[0],
	      hash_value_bytes (h));

  return s;
}

static u8 *
hash_format_pair_default (u8 * s, va_list * args)
{
  void *CLIB_UNUSED (user_arg) = va_arg (*args, void *);
  void *v = va_arg (*args, void *);
  hash_pair_t *p = va_arg (*args, hash_pair_t *);
  hash_t *h = hash_header (v);

  s = format (s, "0x%08x", p->key);
  if (hash_value_bytes (h) > 0)
    s =
      format (s, " -> 0x%8U", format_hex_bytes, &p->value[0],
	      hash_value_bytes (h));
  return s;
}

uword
hash_bytes (void *v)
{
  uword i, bytes;
  hash_t *h = hash_header (v);

  if (!v)
    return 0;

  bytes = vec_capacity (v, hash_header_bytes (v));

  for (i = 0; i < hash_capacity (v); i++)
    {
      if (!hash_is_user (v, i))
	{
	  hash_pair_union_t *p = get_pair (v, i);
	  if (h->log2_pair_size > 0)
	    bytes += 1 << indirect_pair_get_log2_bytes (&p->indirect);
	  else
	    bytes += vec_capacity (p->indirect.pairs, 0);
	}
    }
  return bytes;
}

u8 *
format_hash (u8 * s, va_list * va)
{
  void *v = va_arg (*va, void *);
  int verbose = va_arg (*va, int);
  hash_pair_t *p;
  hash_t *h = hash_header (v);
  uword i;

  s = format (s, "hash %p, %wd elts, capacity %wd, %wd bytes used,\n",
	      v, hash_elts (v), hash_capacity (v), hash_bytes (v));

  {
    uword *occupancy = 0;

    /* Count number of buckets with each occupancy. */
    for (i = 0; i < hash_capacity (v); i++)
      {
	uword j;

	if (hash_is_user (v, i))
	  {
	    j = 1;
	  }
	else
	  {
	    hash_pair_union_t *p = get_pair (v, i);
	    if (h->log2_pair_size > 0)
	      j = indirect_pair_get_len (&p->indirect);
	    else
	      j = vec_len (p->indirect.pairs);
	  }

	vec_validate (occupancy, j);
	occupancy[j]++;
      }

    s = format (s, "  profile ");
    for (i = 0; i < vec_len (occupancy); i++)
      s = format (s, "%wd%c", occupancy[i],
		  i + 1 == vec_len (occupancy) ? '\n' : ' ');

    s = format (s, "  lookup # of compares: ");
    for (i = 1; i < vec_len (occupancy); i++)
      s = format (s, "%wd: .%03d%c", i,
		  (1000 * i * occupancy[i]) / hash_elts (v),
		  i + 1 == vec_len (occupancy) ? '\n' : ' ');

    vec_free (occupancy);
  }

  if (verbose)
    {
      /* *INDENT-OFF* */
      hash_foreach_pair (p, v, {
	s = format (s, "  %U\n", h->format_pair, h->format_pair_arg, v, p);
      });
      /* *INDENT-ON* */
    }

  return s;
}

static uword
unformat_hash_string_internal (unformat_input_t * input,
			       va_list * va, int is_vec)
{
  uword *hash = va_arg (*va, uword *);
  int *result = va_arg (*va, int *);
  u8 *string = 0;
  uword *p;

  if (!unformat (input, is_vec ? "%v%_" : "%s%_", &string))
    return 0;

  p = hash_get_mem (hash, string);
  if (p)
    *result = *p;

  vec_free (string);
  return p ? 1 : 0;
}

uword
unformat_hash_vec_string (unformat_input_t * input, va_list * va)
{
  return unformat_hash_string_internal (input, va, /* is_vec */ 1);
}

uword
unformat_hash_string (unformat_input_t * input, va_list * va)
{
  return unformat_hash_string_internal (input, va, /* is_vec */ 0);
}

clib_error_t *
hash_validate (void *v)
{
  hash_t *h = hash_header (v);
  uword i, j;
  uword *keys = 0;
  clib_error_t *error = 0;

#define CHECK(x) if ((error = ERROR_ASSERT (x))) goto done;

  for (i = 0; i < hash_capacity (v); i++)
    {
      hash_pair_union_t *pu = get_pair (v, i);

      if (hash_is_user (v, i))
	{
	  CHECK (pu->direct.key != 0);
	  vec_add1 (keys, pu->direct.key);
	}
      else
	{
	  hash_pair_t *p;
	  hash_pair_indirect_t *pi = &pu->indirect;
	  uword n;

	  n = h->log2_pair_size > 0
	    ? indirect_pair_get_len (pi) : vec_len (pi->pairs);

	  for (p = pi->pairs; n-- > 0; p = hash_forward1 (h, p))
	    {
	      /* Assert key uniqueness. */
	      for (j = 0; j < vec_len (keys); j++)
		CHECK (keys[j] != p->key);
	      vec_add1 (keys, p->key);
	    }
	}
    }

  CHECK (vec_len (keys) == h->elts);

  vec_free (keys);
done:
  return error;
}

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