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path: root/src/vlib/buffer_node.h
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#!/usr/bin/env python
# Copyright (c) 2016 Comcast Cable Communications Management, LLC.
#
# 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.

# Filter for vpe.api to make it Doxygenish.

import sys, re

if len(sys.argv) < 2:
    sys.stderr.write("Usage: %s <filename>\n" % (sys.argv[0]))
    sys.exit(1)

patterns = [
    # Search for "define" blocks and treat them as structs
    ( re.compile(r"^.*(manual_.[^\s]+\s+)?define\s+(?P<name>[^\s]+)"), r"typedef struct vl_api_\g<name>_t"),

    # For every "brief" statement at the start of a comment block, add an
    # xref with whatever is on the same line. This gives us an index page
    # with all the API methods in one place.
    # XXX Commented out for now; works but duplicates the brief text in the
    # struct documentation
    #( re.compile(r"/\*\*\s*(?P<b>[\\@]brief)\s+(?P<c>.+)(\*/)$"), r'/** @xrefitem api "" "VPP API" \g<c> \g<b> \g<c>'),  # capture inline comment close
    #( re.compile(r"/\*\*\s*(?P<b>[\\@]brief)\s+(?P<c>.+)$"), r'/** @xrefitem api "" "VPP API" \g<c> \g<b> \g<c>'),

    # Since structs don't have params, replace @param with @tparam
    ( re.compile("[\\@]param\\b"), "@tparam"),
]

with open(sys.argv[1]) as fd:
    for line in fd:
        str = line[:-1] # strip \n
        for p in patterns:
            str = p[0].sub(p[1], str)
        sys.stdout.write(str+"\n")
'#n499'>499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
/*
 * 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.
 */
/*
 * buffer_node.h: VLIB buffer handling node helper macros/inlines
 *
 * 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.
 */

#ifndef included_vlib_buffer_node_h
#define included_vlib_buffer_node_h

/** \file
    vlib buffer/node functions
*/

/** \brief Finish enqueueing two buffers forward in the graph.
 Standard dual loop boilerplate element. This is a MACRO,
 with MULTIPLE SIDE EFFECTS. In the ideal case,
 <code>next_index == next0 == next1</code>,
 which means that the speculative enqueue at the top of the dual loop
 has correctly dealt with both packets. In that case, the macro does
 nothing at all.

 @param vm vlib_main_t pointer, varies by thread
 @param node current node vlib_node_runtime_t pointer
 @param next_index speculated next index used for both packets
 @param to_next speculated vector pointer used for both packets
 @param n_left_to_next number of slots left in speculated vector
 @param bi0 first buffer index
 @param bi1 second buffer index
 @param next0 actual next index to be used for the first packet
 @param next1 actual next index to be used for the second packet

 @return @c next_index -- speculative next index to be used for future packets
 @return @c to_next -- speculative frame to be used for future packets
 @return @c n_left_to_next -- number of slots left in speculative frame
*/

#define vlib_validate_buffer_enqueue_x2(vm,node,next_index,to_next,n_left_to_next,bi0,bi1,next0,next1) \
do {									\
  int enqueue_code = (next0 != next_index) + 2*(next1 != next_index);	\
									\
  if (PREDICT_FALSE (enqueue_code != 0))				\
    {									\
      switch (enqueue_code)						\
	{								\
	case 1:								\
	  /* A B A */							\
	  to_next[-2] = bi1;						\
	  to_next -= 1;							\
	  n_left_to_next += 1;						\
	  vlib_set_next_frame_buffer (vm, node, next0, bi0);		\
	  break;							\
									\
	case 2:								\
	  /* A A B */							\
	  to_next -= 1;							\
	  n_left_to_next += 1;						\
	  vlib_set_next_frame_buffer (vm, node, next1, bi1);		\
	  break;							\
									\
	case 3:								\
	  /* A B B or A B C */						\
	  to_next -= 2;							\
	  n_left_to_next += 2;						\
	  vlib_set_next_frame_buffer (vm, node, next0, bi0);		\
	  vlib_set_next_frame_buffer (vm, node, next1, bi1);		\
	  if (next0 == next1)						\
	    {								\
	      vlib_put_next_frame (vm, node, next_index,		\
				   n_left_to_next);			\
	      next_index = next1;					\
	      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); \
	    }								\
	}								\
    }									\
} while (0)


/** \brief Finish enqueueing four buffers forward in the graph.
 Standard quad loop boilerplate element. This is a MACRO,
 with MULTIPLE SIDE EFFECTS. In the ideal case,
 <code>next_index == next0 == next1 == next2 == next3</code>,
 which means that the speculative enqueue at the top of the quad loop
 has correctly dealt with all four packets. In that case, the macro does
 nothing at all.

 @param vm vlib_main_t pointer, varies by thread
 @param node current node vlib_node_runtime_t pointer
 @param next_index speculated next index used for both packets
 @param to_next speculated vector pointer used for both packets
 @param n_left_to_next number of slots left in speculated vector
 @param bi0 first buffer index
 @param bi1 second buffer index
 @param bi2 third buffer index
 @param bi3 fourth buffer index
 @param next0 actual next index to be used for the first packet
 @param next1 actual next index to be used for the second packet
 @param next2 actual next index to be used for the third packet
 @param next3 actual next index to be used for the fourth packet

 @return @c next_index -- speculative next index to be used for future packets
 @return @c to_next -- speculative frame to be used for future packets
 @return @c n_left_to_next -- number of slots left in speculative frame
*/

#define vlib_validate_buffer_enqueue_x4(vm,node,next_index,to_next,n_left_to_next,bi0,bi1,bi2,bi3,next0,next1,next2,next3) \
do {                                                                    \
  /* After the fact: check the [speculative] enqueue to "next" */       \
  u32 fix_speculation = (next_index ^ next0) | (next_index ^ next1)     \
    | (next_index ^ next2) | (next_index ^ next3);                      \
  if (PREDICT_FALSE(fix_speculation))                                   \
    {                                                                   \
      /* rewind... */                                                   \
      to_next -= 4;                                                     \
      n_left_to_next += 4;                                              \
                                                                        \
      /* If bi0 belongs to "next", send it there */                     \
      if (next_index == next0)                                          \
        {                                                               \
          to_next[0] = bi0;                                             \
          to_next++;                                                    \
          n_left_to_next --;                                            \
        }                                                               \
      else              /* send it where it needs to go */              \
        vlib_set_next_frame_buffer (vm, node, next0, bi0);              \
                                                                        \
      if (next_index == next1)                                          \
        {                                                               \
          to_next[0] = bi1;                                             \
          to_next++;                                                    \
          n_left_to_next --;                                            \
        }                                                               \
      else                                                              \
        vlib_set_next_frame_buffer (vm, node, next1, bi1);              \
                                                                        \
      if (next_index == next2)                                          \
        {                                                               \
          to_next[0] = bi2;                                             \
          to_next++;                                                    \
          n_left_to_next --;                                            \
        }                                                               \
      else                                                              \
        vlib_set_next_frame_buffer (vm, node, next2, bi2);              \
                                                                        \
      if (next_index == next3)                                          \
        {                                                               \
          to_next[0] = bi3;                                             \
          to_next++;                                                    \
          n_left_to_next --;                                            \
        }                                                               \
      else                                                              \
        {                                                               \
          vlib_set_next_frame_buffer (vm, node, next3, bi3);            \
                                                                        \
          /* Change speculation: last 2 packets went to the same node*/ \
          if (next2 == next3)                                           \
            {                                                           \
              vlib_put_next_frame (vm, node, next_index, n_left_to_next); \
              next_index = next3;                                       \
              vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); \
            }                                                           \
	}                                                               \
    }                                                                   \
 } while(0);

/** \brief Finish enqueueing one buffer forward in the graph.
 Standard single loop boilerplate element. This is a MACRO,
 with MULTIPLE SIDE EFFECTS. In the ideal case,
 <code>next_index == next0</code>,
 which means that the speculative enqueue at the top of the single loop
 has correctly dealt with the packet in hand. In that case, the macro does
 nothing at all.

 @param vm vlib_main_t pointer, varies by thread
 @param node current node vlib_node_runtime_t pointer
 @param next_index speculated next index used for both packets
 @param to_next speculated vector pointer used for both packets
 @param n_left_to_next number of slots left in speculated vector
 @param bi0 first buffer index
 @param next0 actual next index to be used for the first packet

 @return @c next_index -- speculative next index to be used for future packets
 @return @c to_next -- speculative frame to be used for future packets
 @return @c n_left_to_next -- number of slots left in speculative frame
*/
#define vlib_validate_buffer_enqueue_x1(vm,node,next_index,to_next,n_left_to_next,bi0,next0) \
do {									\
  if (PREDICT_FALSE (next0 != next_index))				\
    {									\
      vlib_put_next_frame (vm, node, next_index, n_left_to_next + 1);	\
      next_index = next0;						\
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); \
									\
      to_next[0] = bi0;							\
      to_next += 1;							\
      n_left_to_next -= 1;						\
    }									\
} while (0)

always_inline uword
generic_buffer_node_inline (vlib_main_t * vm,
			    vlib_node_runtime_t * node,
			    vlib_frame_t * frame,
			    uword sizeof_trace,
			    void *opaque1,
			    uword opaque2,
			    void (*two_buffers) (vlib_main_t * vm,
						 void *opaque1,
						 uword opaque2,
						 vlib_buffer_t * b0,
						 vlib_buffer_t * b1,
						 u32 * next0, u32 * next1),
			    void (*one_buffer) (vlib_main_t * vm,
						void *opaque1, uword opaque2,
						vlib_buffer_t * b0,
						u32 * next0))
{
  u32 n_left_from, *from, *to_next;
  u32 next_index;

  from = vlib_frame_vector_args (frame);
  n_left_from = frame->n_vectors;
  next_index = node->cached_next_index;

  if (node->flags & VLIB_NODE_FLAG_TRACE)
    vlib_trace_frame_buffers_only (vm, node, from, frame->n_vectors,
				   /* stride */ 1, sizeof_trace);

  while (n_left_from > 0)
    {
      u32 n_left_to_next;

      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

      while (n_left_from >= 4 && n_left_to_next >= 2)
	{
	  vlib_buffer_t *p0, *p1;
	  u32 pi0, next0;
	  u32 pi1, next1;

	  /* Prefetch next iteration. */
	  {
	    vlib_buffer_t *p2, *p3;

	    p2 = vlib_get_buffer (vm, from[2]);
	    p3 = vlib_get_buffer (vm, from[3]);

	    vlib_prefetch_buffer_header (p2, LOAD);
	    vlib_prefetch_buffer_header (p3, LOAD);

	    CLIB_PREFETCH (p2->data, 64, LOAD);
	    CLIB_PREFETCH (p3->data, 64, LOAD);
	  }

	  pi0 = to_next[0] = from[0];
	  pi1 = to_next[1] = from[1];
	  from += 2;
	  to_next += 2;
	  n_left_from -= 2;
	  n_left_to_next -= 2;

	  p0 = vlib_get_buffer (vm, pi0);
	  p1 = vlib_get_buffer (vm, pi1);

	  two_buffers (vm, opaque1, opaque2, p0, p1, &next0, &next1);

	  vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
					   to_next, n_left_to_next,
					   pi0, pi1, next0, next1);
	}

      while (n_left_from > 0 && n_left_to_next > 0)
	{
	  vlib_buffer_t *p0;
	  u32 pi0, next0;

	  pi0 = from[0];
	  to_next[0] = pi0;
	  from += 1;
	  to_next += 1;
	  n_left_from -= 1;
	  n_left_to_next -= 1;

	  p0 = vlib_get_buffer (vm, pi0);

	  one_buffer (vm, opaque1, opaque2, p0, &next0);

	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
					   to_next, n_left_to_next,
					   pi0, next0);
	}

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
    }

  return frame->n_vectors;
}

static_always_inline void
vlib_buffer_enqueue_to_next (vlib_main_t * vm, vlib_node_runtime_t * node,
			     u32 * buffers, u16 * nexts, uword count)
{
  u32 *to_next, n_left_to_next, max;
  u16 next_index;

  next_index = nexts[0];
  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
  max = clib_min (n_left_to_next, count);

  while (count)
    {
      u32 n_enqueued;
      if ((nexts[0] != next_index) || n_left_to_next == 0)
	{
	  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
	  next_index = nexts[0];
	  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
	  max = clib_min (n_left_to_next, count);
	}
#if defined(CLIB_HAVE_VEC512)
      u16x32 next32 = CLIB_MEM_OVERFLOW_LOAD (u16x32_load_unaligned, nexts);
      next32 = (next32 == u16x32_splat (next32[0]));
      u64 bitmap = u16x32_msb_mask (next32);
      n_enqueued = count_trailing_zeros (~bitmap);
#elif defined(CLIB_HAVE_VEC256)
      u16x16 next16 = CLIB_MEM_OVERFLOW_LOAD (u16x16_load_unaligned, nexts);
      next16 = (next16 == u16x16_splat (next16[0]));
      u64 bitmap = u8x32_msb_mask ((u8x32) next16);
      n_enqueued = count_trailing_zeros (~bitmap) / 2;
#elif defined(CLIB_HAVE_VEC128) && defined(CLIB_HAVE_VEC128_MSB_MASK)
      u16x8 next8 = CLIB_MEM_OVERFLOW_LOAD (u16x8_load_unaligned, nexts);
      next8 = (next8 == u16x8_splat (next8[0]));
      u64 bitmap = u8x16_msb_mask ((u8x16) next8);
      n_enqueued = count_trailing_zeros (~bitmap) / 2;
#else
      u16 x = 0;
      if (count + 3 < max)
	{
	  x |= next_index ^ nexts[1];
	  x |= next_index ^ nexts[2];
	  x |= next_index ^ nexts[3];
	  n_enqueued = (x == 0) ? 4 : 1;
	}
      else
	n_enqueued = 1;
#endif

      if (PREDICT_FALSE (n_enqueued > max))
	n_enqueued = max;

#ifdef CLIB_HAVE_VEC512
      if (n_enqueued >= 32)
	{
	  vlib_buffer_copy_indices (to_next, buffers, 32);
	  nexts += 32;
	  to_next += 32;
	  buffers += 32;
	  n_left_to_next -= 32;
	  count -= 32;
	  max -= 32;
	  continue;
	}
#endif

#ifdef CLIB_HAVE_VEC256
      if (n_enqueued >= 16)
	{
	  vlib_buffer_copy_indices (to_next, buffers, 16);
	  nexts += 16;
	  to_next += 16;
	  buffers += 16;
	  n_left_to_next -= 16;
	  count -= 16;
	  max -= 16;
	  continue;
	}
#endif

#ifdef CLIB_HAVE_VEC128
      if (n_enqueued >= 8)
	{
	  vlib_buffer_copy_indices (to_next, buffers, 8);
	  nexts += 8;
	  to_next += 8;
	  buffers += 8;
	  n_left_to_next -= 8;
	  count -= 8;
	  max -= 8;
	  continue;
	}
#endif

      if (n_enqueued >= 4)
	{
	  vlib_buffer_copy_indices (to_next, buffers, 4);
	  nexts += 4;
	  to_next += 4;
	  buffers += 4;
	  n_left_to_next -= 4;
	  count -= 4;
	  max -= 4;
	  continue;
	}

      /* copy */
      to_next[0] = buffers[0];

      /* next */
      nexts += 1;
      to_next += 1;
      buffers += 1;
      n_left_to_next -= 1;
      count -= 1;
      max -= 1;
    }
  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}

static_always_inline void
vlib_buffer_enqueue_to_single_next (vlib_main_t * vm,
				    vlib_node_runtime_t * node, u32 * buffers,
				    u16 next_index, u32 count)
{
  u32 *to_next, n_left_to_next, n_enq;

  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);

  if (PREDICT_TRUE (n_left_to_next >= count))
    {
      vlib_buffer_copy_indices (to_next, buffers, count);
      n_left_to_next -= count;
      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
      return;
    }

  n_enq = n_left_to_next;
next:
  vlib_buffer_copy_indices (to_next, buffers, n_enq);
  n_left_to_next -= n_enq;

  if (PREDICT_FALSE (count > n_enq))
    {
      count -= n_enq;
      buffers += n_enq;

      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
      n_enq = clib_min (n_left_to_next, count);
      goto next;
    }
  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}

static_always_inline u32
vlib_buffer_enqueue_to_thread (vlib_main_t * vm, u32 frame_queue_index,
			       u32 * buffer_indices, u16 * thread_indices,
			       u32 n_packets, int drop_on_congestion)
{
  vlib_thread_main_t *tm = vlib_get_thread_main ();
  vlib_frame_queue_main_t *fqm;
  vlib_frame_queue_per_thread_data_t *ptd;
  u32 n_left = n_packets;
  u32 drop_list[VLIB_FRAME_SIZE], *dbi = drop_list, n_drop = 0;
  vlib_frame_queue_elt_t *hf = 0;
  u32 n_left_to_next_thread = 0, *to_next_thread = 0;
  u32 next_thread_index, current_thread_index = ~0;
  int i;

  fqm = vec_elt_at_index (tm->frame_queue_mains, frame_queue_index);
  ptd = vec_elt_at_index (fqm->per_thread_data, vm->thread_index);

  while (n_left)
    {
      next_thread_index = thread_indices[0];

      if (next_thread_index != current_thread_index)
	{
	  if (drop_on_congestion &&
	      is_vlib_frame_queue_congested
	      (frame_queue_index, next_thread_index, fqm->queue_hi_thresh,
	       ptd->congested_handoff_queue_by_thread_index))
	    {
	      dbi[0] = buffer_indices[0];
	      dbi++;
	      n_drop++;
	      goto next;
	    }

	  if (hf)
	    hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_thread;

	  hf = vlib_get_worker_handoff_queue_elt (frame_queue_index,
						  next_thread_index,
						  ptd->handoff_queue_elt_by_thread_index);

	  n_left_to_next_thread = VLIB_FRAME_SIZE - hf->n_vectors;
	  to_next_thread = &hf->buffer_index[hf->n_vectors];
	  current_thread_index = next_thread_index;
	}

      to_next_thread[0] = buffer_indices[0];
      to_next_thread++;
      n_left_to_next_thread--;

      if (n_left_to_next_thread == 0)
	{
	  hf->n_vectors = VLIB_FRAME_SIZE;
	  vlib_put_frame_queue_elt (hf);
	  vlib_mains[current_thread_index]->check_frame_queues = 1;
	  current_thread_index = ~0;
	  ptd->handoff_queue_elt_by_thread_index[next_thread_index] = 0;
	  hf = 0;
	}

      /* next */
    next:
      thread_indices += 1;
      buffer_indices += 1;
      n_left -= 1;
    }

  if (hf)
    hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_thread;

  /* Ship frames to the thread nodes */
  for (i = 0; i < vec_len (ptd->handoff_queue_elt_by_thread_index); i++)
    {
      if (ptd->handoff_queue_elt_by_thread_index[i])
	{
	  hf = ptd->handoff_queue_elt_by_thread_index[i];
	  /*
	   * It works better to let the handoff node
	   * rate-adapt, always ship the handoff queue element.
	   */
	  if (1 || hf->n_vectors == hf->last_n_vectors)
	    {
	      vlib_put_frame_queue_elt (hf);
	      vlib_mains[i]->check_frame_queues = 1;
	      ptd->handoff_queue_elt_by_thread_index[i] = 0;
	    }
	  else
	    hf->last_n_vectors = hf->n_vectors;
	}
      ptd->congested_handoff_queue_by_thread_index[i] =
	(vlib_frame_queue_t *) (~0);
    }

  if (drop_on_congestion && n_drop)
    vlib_buffer_free (vm, drop_list, n_drop);

  return n_packets - n_drop;
}

#endif /* included_vlib_buffer_node_h */

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