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authorNathan Skrzypczak <nathan.skrzypczak@gmail.com>2021-09-29 15:36:51 +0200
committerDave Wallace <dwallacelf@gmail.com>2021-10-06 12:32:20 +0000
commit2c77ae484c30ca5a752c5f7ccd336d8e977db9a6 (patch)
treedbc5038f3e4cc60b62f151589728e7d74490b160 /src/vnet/adj/adj_midchain.h
parentecd6b1a985acd8e0256a170f1fe1f7e38df8c420 (diff)
docs: vnet comment nitfixes
Type: improvement Change-Id: Iac01d7830b53819ace8f199554be10ab89ecdb97 Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
Diffstat (limited to 'src/vnet/adj/adj_midchain.h')
-rw-r--r--src/vnet/adj/adj_midchain.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vnet/adj/adj_midchain.h b/src/vnet/adj/adj_midchain.h
index 5fb0ee8efb3..85294122f08 100644
--- a/src/vnet/adj/adj_midchain.h
+++ b/src/vnet/adj/adj_midchain.h
@@ -99,7 +99,7 @@ extern void adj_nbr_midchain_stack(adj_index_t adj_index,
* The FIB entry to stack on
*
* @param fct
- * The chain type to use from the fib entry fowarding
+ * The chain type to use from the fib entry forwarding
*/
extern void adj_nbr_midchain_stack_on_fib_entry(adj_index_t adj_index,
fib_node_index_t fei,
n188' href='#n188'>188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 
/*
 * 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) 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.
*/

#ifndef included_fifo_h
#define included_fifo_h

#include <vppinfra/cache.h>
#include <vppinfra/error.h>	/* for ASSERT */
#include <vppinfra/vec.h>

typedef struct
{
  /* First index of valid data in fifo. */
  u32 head_index;

  /* One beyond last index in fifo. */
  u32 tail_index;
} clib_fifo_header_t;

always_inline clib_fifo_header_t *
clib_fifo_header (void *f)
{
  return vec_header (f, sizeof (clib_fifo_header_t));
}

/* Aliases. */
#define clib_fifo_len(v) vec_len(v)
#define _clib_fifo_len(v) _vec_len(v)
#define clib_fifo_end(v) vec_end(v)

always_inline uword
clib_fifo_elts (void *v)
{
  word l, r;
  clib_fifo_header_t *f = clib_fifo_header (v);

  if (!v)
    return 0;

  l = _clib_fifo_len (v);
  r = (word) f->tail_index - (word) f->head_index;
  r = r < 0 ? r + l : r;
  ASSERT (r >= 0 && r <= l);
  return r;
}

always_inline uword
clib_fifo_free_elts (void *v)
{
  return clib_fifo_len (v) - clib_fifo_elts (v);
}

always_inline void
clib_fifo_reset (void *v)
{
  clib_fifo_header_t *f = clib_fifo_header (v);
  if (v)
    {
      f->head_index = f->tail_index = 0;
      _vec_len (v) = 0;
    }
}

/* External resize function. */
void *_clib_fifo_resize (void *v, uword n_elts, uword elt_bytes);

#define clib_fifo_resize(f,n_elts) \
  f = _clib_fifo_resize ((f), (n_elts), sizeof ((f)[0]))

always_inline void *
_clib_fifo_validate (void *v, uword n_elts, uword elt_bytes)
{
  if (clib_fifo_free_elts (v) < n_elts)
    v = _clib_fifo_resize (v, n_elts, elt_bytes);
  return v;
}

#define clib_fifo_validate(f,n_elts) \
  f = _clib_fifo_validate ((f), (n_elts), sizeof (f[0]))

/* Advance tail pointer by N_ELTS which can be either positive or negative. */
always_inline void *
_clib_fifo_advance_tail (void *v, word n_elts, uword elt_bytes,
			 uword * tail_return)
{
  word i, l, n_free;
  clib_fifo_header_t *f;

  n_free = clib_fifo_free_elts (v);
  if (n_free < n_elts)
    {
      v = _clib_fifo_resize (v, n_elts, elt_bytes);
      n_free = clib_fifo_free_elts (v);
    }

  ASSERT (n_free >= n_elts);
  n_free -= n_elts;

  f = clib_fifo_header (v);
  l = _clib_fifo_len (v);
  i = f->tail_index;

  if (n_free == 0)
    {
      /* Mark fifo full. */
      f->tail_index = f->head_index + l;
    }
  else
    {
      word n = f->tail_index + n_elts;
      if (n >= l)
	n -= l;
      else if (n < 0)
	n += l;
      ASSERT (n >= 0 && n < l);
      f->tail_index = n;
    }

  ASSERT (clib_fifo_free_elts (v) == n_free);

  if (tail_return)
    *tail_return = n_elts > 0 ? i : f->tail_index;

  return v;
}

#define clib_fifo_advance_tail(f,n_elts)				\
({									\
  uword _i;								\
  (f) = _clib_fifo_advance_tail ((f), (n_elts), sizeof ((f)[0]), &_i);	\
  (f) + _i;								\
})

always_inline uword
clib_fifo_advance_head (void *v, uword n_elts)
{
  clib_fifo_header_t *f;
  uword l, i, n;

  ASSERT (clib_fifo_elts (v) >= n_elts);
  f = clib_fifo_header (v);
  l = _clib_fifo_len (v);

  /* If fifo was full, restore tail pointer. */
  if (f->tail_index == f->head_index + l)
    f->tail_index = f->head_index;

  n = i = f->head_index;
  n += n_elts;
  n = n >= l ? n - l : n;
  ASSERT (n < l);
  f->head_index = n;

  return i;
}

/* Add given element to fifo. */
#define clib_fifo_add1(f,e)					\
do {								\
  uword _i;							\
  (f) = _clib_fifo_advance_tail ((f), 1, sizeof ((f)[0]), &_i);	\
  (f)[_i] = (e);						\
} while (0)

/* Add element to fifo; return pointer to new element. */
#define clib_fifo_add2(f,p)					\
do {								\
  uword _i;							\
  (f) = _clib_fifo_advance_tail ((f), 1, sizeof ((f)[0]), &_i);	\
  (p) = (f) + _i;						\
} while (0)

/* Add several elements to fifo. */
#define clib_fifo_add(f,e,n)						\
do {									\
  uword _i, _l; word _n0, _n1;						\
									\
  _n0 = (n);								\
  (f) = _clib_fifo_advance_tail ((f), _n0, sizeof ((f)[0]), &_i);	\
  _l = clib_fifo_len (f);						\
  _n1 = _i + _n0 - _l;							\
  _n1 = _n1 < 0 ? 0 : _n1;						\
  _n0 -= _n1;								\
  clib_memcpy_fast ((f) + _i, (e), _n0 * sizeof ((f)[0]));		\
  if (_n1)								\
    clib_memcpy_fast ((f) + 0, (e) + _n0, _n1 * sizeof ((f)[0]));	\
} while (0)

/* Subtract element from fifo. */
#define clib_fifo_sub1(f,e)			\
do {						\
  uword _i;					\
  ASSERT (clib_fifo_elts (f) >= 1);		\
  _i = clib_fifo_advance_head ((f), 1);		\
  (e) = (f)[_i];				\
} while (0)

#define clib_fifo_sub2(f,p)			\
do {						\
  uword _i;					\
  ASSERT (clib_fifo_elts (f) >= 1);		\
  _i = clib_fifo_advance_head ((f), 1);		\
  (p) = (f) + _i;				\
} while (0)

always_inline uword
clib_fifo_head_index (void *v)
{
  clib_fifo_header_t *f = clib_fifo_header (v);
  return v ? f->head_index : 0;
}

always_inline uword
clib_fifo_tail_index (void *v)
{
  clib_fifo_header_t *f = clib_fifo_header (v);
  return v ? f->tail_index : 0;
}

#define clib_fifo_head(v) ((v) + clib_fifo_head_index (v))
#define clib_fifo_tail(v) ((v) + clib_fifo_tail_index (v))

#define clib_fifo_free(f) vec_free_h((f),sizeof(clib_fifo_header_t))

always_inline uword
clib_fifo_elt_index (void *v, uword i)
{
  clib_fifo_header_t *f = clib_fifo_header (v);
  uword result = 0;

  ASSERT (i < clib_fifo_elts (v));

  if (v)
    {
      result = f->head_index + i;
      if (result >= _vec_len (v))
	result -= _vec_len (v);
    }

  return result;
}

#define clib_fifo_elt_at_index(v,i) ((v) + clib_fifo_elt_index (v, (i)))

#define clib_fifo_foreach(v,f,body)		\
do {						\
  uword _i, _l, _n;				\
						\
  _i = clib_fifo_head_index (f);		\
  _l = clib_fifo_len (f);			\
  _n = clib_fifo_elts (f);			\
  while (_n > 0)				\
    {						\
      (v) = (f) + _i;				\
      do { body; } while (0);			\
      _n--;					\
      _i++;					\
      _i = _i >= _l ? 0 : _i;			\
    }						\
} while (0)

#endif /* included_fifo_h */

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