src/vnet/session/segment_manager.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160

@media only all and (prefers-color-scheme: dark) {
.highlight .hll { background-color: #49483e }
.highlight .c { color: #75715e } /* Comment */
.highlight .err { color: #960050; background-color: #1e0010 } /* Error */
.highlight .k { color: #66d9ef } /* Keyword */
.highlight .l { color: #ae81ff } /* Literal */
.highlight .n { color: #f8f8f2 } /* Name */
.highlight .o { color: #f92672 } /* Operator */
.highlight .p { color: #f8f8f2 } /* Punctuation */
.highlight .ch { color: #75715e } /* Comment.Hashbang */
.highlight .cm { color: #75715e } /* Comment.Multiline */
.highlight .cp { color: #75715e } /* Comment.Preproc */
.highlight .cpf { color: #75715e } /* Comment.PreprocFile */
.highlight .c1 { color: #75715e } /* Comment.Single */
.highlight .cs { color: #75715e } /* Comment.Special */
.highlight .gd { color: #f92672 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gi { color: #a6e22e } /* Generic.Inserted */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #75715e } /* Generic.Subheading */
.highlight .kc { color: #66d9ef } /* Keyword.Constant */
.highlight .kd { color: #66d9ef } /* Keyword.Declaration */
.highlight .kn { color: #f92672 } /* Keyword.Namespace */
.highlight .kp { color: #66d9ef } /* Keyword.Pseudo */
.highlight .kr { color: #66d9ef } /* Keyword.Reserved */
.highlight .kt { color: #66d9ef } /* Keyword.Type */
.highlight .ld { color: #e6db74 } /* Literal.Date */
.highlight .m { color: #ae81ff } /* Literal.Number */
.highlight .s { color: #e6db74 } /* Literal.String */
.highlight .na { color: #a6e22e } /* Name.Attribute */
.highlight .nb { color: #f8f8f2 } /* Name.Builtin */
.highlight .nc { color: #a6e22e } /* Name.Class */
.highlight .no { color: #66d9ef } /* Name.Constant */
.highlight .nd { color: #a6e22e } /* Name.Decorator */
.highlight .ni { color: #f8f8f2 } /* Name.Entity */
.highlight .ne { color: #a6e22e } /* Name.Exception */
.highlight .nf { color: #a6e22e } /* Name.Function */
.highlight .nl { color: #f8f8f2 } /* Name.Label */
.highlight .nn { color: #f8f8f2 } /* Name.Namespace */
.highlight .nx { color: #a6e22e } /* Name.Other */
.highlight .py { color: #f8f8f2 } /* Name.Property */
.highlight .nt { color: #f92672 } /* Name.Tag */
.highlight .nv { color: #f8f8f2 } /* Name.Variable */
.highlight .ow { color: #f92672 } /* Operator.Word */
.highlight .w { color: #f8f8f2 } /* Text.Whitespace */
.highlight .mb { color: #ae81ff } /* Literal.Number.Bin */
.highlight .mf { color: #ae81ff } /* Literal.Number.Float */
.highlight .mh { color: #ae81ff } /* Literal.Number.Hex */
.highlight .mi { color: #ae81ff } /* Literal.Number.Integer */
.highlight .mo { color: #ae81ff } /* Literal.Number.Oct */
.highlight .sa { color: #e6db74 } /* Literal.String.Affix */
.highlight .sb { color: #e6db74 } /* Literal.String.Backtick */
.highlight .sc { color: #e6db74 } /* Literal.String.Char */
.highlight .dl { color: #e6db74 } /* Literal.String.Delimiter */
.highlight .sd { color: #e6db74 } /* Literal.String.Doc */
.highlight .s2 { color: #e6db74 } /* Literal.String.Double */
.highlight .se { color: #ae81ff } /* Literal.String.Escape */
.highlight .sh { color: #e6db74 } /* Literal.String.Heredoc */
.highlight .si { color: #e6db74 } /* Literal.String.Interpol */
.highlight .sx { color: #e6db74 } /* Literal.String.Other */
.highlight .sr { color: #e6db74 } /* Literal.String.Regex */
.highlight .s1 { color: #e6db74 } /* Literal.String.Single */
.highlight .ss { color: #e6db74 } /* Literal.String.Symbol */
.highlight .bp { color: #f8f8f2 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #a6e22e } /* Name.Function.Magic */
.highlight .vc { color: #f8f8f2 } /* Name.Variable.Class */
.highlight .vg { color: #f8f8f2 } /* Name.Variable.Global */
.highlight .vi { color: #f8f8f2 } /* Name.Variable.Instance */
.highlight .vm { color: #f8f8f2 } /* Name.Variable.Magic */
.highlight .il { color: #ae81ff } /* Literal.Number.Integer.Long */
}
@media (prefers-color-scheme: light) {
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
}
all:
  children:
    tg:
      hosts:
        {{ tg_public_ip }}
    sut:
      hosts:
        {{ dut1_public_ip | default() }}
        {{ dut2_public_ip | default() }}
/*
 * 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 <vnet/session/segment_manager.h>
#include <vnet/session/session.h>
#include <vnet/session/application.h>

segment_manager_main_t segment_manager_main;

/**
 * Counter used to build segment names
 */
static u32 segment_name_counter = 0;

/**
 * Default fifo and segment size. TODO config.
 */
static u32 default_fifo_size = 1 << 12;
static u32 default_segment_size = 1 << 20;
static u32 default_app_evt_queue_size = 128;

segment_manager_properties_t *
segment_manager_properties_get (segment_manager_t * sm)
{
  return application_get_segment_manager_properties (sm->app_index);
}

segment_manager_properties_t *
segment_manager_properties_init (segment_manager_properties_t * props)
{
  props->add_segment_size = default_segment_size;
  props->rx_fifo_size = default_fifo_size;
  props->tx_fifo_size = default_fifo_size;
  props->evt_q_size = default_app_evt_queue_size;
  return props;
}

static u8
segment_manager_app_detached (segment_manager_t * sm)
{
  return (sm->app_index == SEGMENT_MANAGER_INVALID_APP_INDEX);
}

void
segment_manager_app_detach (segment_manager_t * sm)
{
  sm->app_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
}

always_inline u32
segment_manager_segment_index (segment_manager_t * sm,
			       svm_fifo_segment_private_t * seg)
{
  return (seg - sm->segments);
}

/**
 * Remove segment without lock
 */
void
segment_manager_del_segment (segment_manager_t * sm,
			     svm_fifo_segment_private_t * fs)
{
  segment_manager_main_t *smm = &segment_manager_main;

  if (ssvm_type (&fs->ssvm) != SSVM_SEGMENT_PRIVATE)
    clib_valloc_free (&smm->va_allocator, fs->ssvm.requested_va);

  ssvm_delete (&fs->ssvm);

  if (CLIB_DEBUG)
    memset (fs, 0xfb, sizeof (*fs));
  pool_put (sm->segments, fs);
}

/**
 * Removes segment after acquiring writer lock
 */
always_inline void
segment_manager_lock_and_del_segment (segment_manager_t * sm, u32 fs_index)
{
  svm_fifo_segment_private_t *fs;
  u8 is_prealloc;

  clib_rwlock_writer_lock (&sm->segments_rwlock);
  fs = segment_manager_get_segment (sm, fs_index);
  is_prealloc = svm_fifo_segment_flags (fs) & FIFO_SEGMENT_F_IS_PREALLOCATED;
  if (is_prealloc && !segment_manager_app_detached (sm))
    {
      clib_rwlock_writer_unlock (&sm->segments_rwlock);
      return;
    }

  segment_manager_del_segment (sm, fs);
  clib_rwlock_writer_unlock (&sm->segments_rwlock);
}

/**
 * Reads a segment from the segment manager's pool without lock
 */
svm_fifo_segment_private_t *
segment_manager_get_segment (segment_manager_t * sm, u32 segment_index)
{
  return pool_elt_at_index (sm->segments, segment_index);
}

/**
 * Reads a segment from the segment manager's pool and acquires reader lock
 *
 * Caller must drop the reader's lock by calling
 * @ref segment_manager_segment_reader_unlock once it finishes working with
 * the segment.
 */
svm_fifo_segment_private_t *
segment_manager_get_segment_w_lock (segment_manager_t * sm, u32 segment_index)
{
  clib_rwlock_reader_lock (&sm->segments_rwlock);
  return pool_elt_at_index (sm->segments, segment_index);
}

void
segment_manager_segment_reader_unlock (segment_manager_t * sm)
{
  ASSERT (sm->segments_rwlock->n_readers > 0);
  clib_rwlock_reader_unlock (&sm->segments_rwlock);
}

void
segment_manager_segment_writer_unlock (segment_manager_t * sm)
{
  clib_rwlock_writer_unlock (&sm->segments_rwlock);
}

/**
 * Adds segment to segment manager's pool
 *
 * If needed a writer's lock is acquired before allocating a new segment
 * to avoid affecting any of the segments pool readers.
 */
int
segment_manager_add_segment (segment_manager_t * sm, u32 segment_size)
{
  segment_manager_main_t *smm = &segment_manager_main;
  u32 rnd_margin = 128 << 10, seg_index;
  segment_manager_properties_t *props;
  uword baseva = (u64) ~ 0, alloc_size;
  svm_fifo_segment_private_t *seg;
  u8 *seg_name;
  int rv;

  props = segment_manager_properties_get (sm);

  /* Not configured for addition of new segments and not first */
  if (!props->add_segment && !segment_size)
    {
      clib_warning ("cannot allocate new segment");
      return VNET_API_ERROR_INVALID_VALUE;
    }

  /*
   * Allocate fifo segment and lock if needed
   */
  if (vlib_num_workers ())
    {
      clib_rwlock_writer_lock (&sm->segments_rwlock);
      pool_get (sm->segments, seg);
    }
  else
    {
      pool_get (sm->segments, seg);
    }
  memset (seg, 0, sizeof (*seg));

  /*
   * Initialize ssvm segment and svm fifo private header
   */
  segment_size = segment_size ? segment_size : props->add_segment_size;
  if (props->segment_type != SSVM_SEGMENT_PRIVATE)
    {
      seg_name = format (0, "%d-%d%c", getpid (), segment_name_counter++, 0);
      alloc_size = segment_size + rnd_margin;
      baseva = clib_valloc_alloc (&smm->va_allocator, alloc_size, 0);
      if (!baseva)
	{
	  clib_warning ("out of space for segments");
	  return -1;
	}
    }
  else
    seg_name = format (0, "%s%c", "process-private-segment", 0);

  seg->ssvm.ssvm_size = segment_size;
  seg->ssvm.name = seg_name;
  seg->ssvm.requested_va = baseva;

  if ((rv = ssvm_master_init (&seg->ssvm, props->segment_type)))
    {
      clib_warning ("svm_master_init ('%v', %u) failed", seg_name,
		    segment_size);

      if (props->segment_type != SSVM_SEGMENT_PRIVATE)
	clib_valloc_free (&smm->va_allocator, baseva);
      pool_put (sm->segments, seg);
      return (rv);
    }

  svm_fifo_segment_init (seg);

  /*
   * Save segment index before dropping lock, if any held
   */
  seg_index = seg - sm->segments;

  if (vlib_num_workers ())
    clib_rwlock_writer_unlock (&sm->segments_rwlock);

  return seg_index;
}

segment_manager_t *
segment_manager_new ()
{
  segment_manager_main_t *smm = &segment_manager_main;
  segment_manager_t *sm;
  pool_get (smm->segment_managers, sm);
  memset (sm, 0, sizeof (*sm));
  clib_rwlock_init (&sm->segments_rwlock);
  return sm;
}

/**
 * Initializes segment manager based on options provided.
 * Returns error if ssvm segment(s) allocation fails.
 */
int
segment_manager_init (segment_manager_t * sm, u32 first_seg_size,
		      u32 prealloc_fifo_pairs)
{
  u32 rx_fifo_size, tx_fifo_size, pair_size;
  u32 rx_rounded_data_size, tx_rounded_data_size;
  u64 approx_total_size, max_seg_size =
    ((u64) 1 << 32) - clib_mem_get_page_size ();
  segment_manager_properties_t *props;
  svm_fifo_segment_private_t *segment;
  u32 approx_segment_count;
  int seg_index, i;

  props = segment_manager_properties_get (sm);
  first_seg_size = clib_max (first_seg_size, default_segment_size);

  if (prealloc_fifo_pairs)
    {
      /* Figure out how many segments should be preallocated */
      rx_rounded_data_size = (1 << (max_log2 (props->rx_fifo_size)));
      tx_rounded_data_size = (1 << (max_log2 (props->tx_fifo_size)));

      rx_fifo_size = sizeof (svm_fifo_t) + rx_rounded_data_size;
      tx_fifo_size = sizeof (svm_fifo_t) + tx_rounded_data_size;
      pair_size = rx_fifo_size + tx_fifo_size;

      approx_total_size = (u64) prealloc_fifo_pairs *pair_size;
      if (first_seg_size > approx_total_size)
	max_seg_size = first_seg_size;
      approx_segment_count = (approx_total_size + (max_seg_size - 1))
	/ max_seg_size;

      /* Allocate the segments */
      for (i = 0; i < approx_segment_count + 1; i++)
	{
	  seg_index = segment_manager_add_segment (sm, max_seg_size);
	  if (seg_index < 0)
	    {
	      clib_warning ("Failed to preallocate segment %d", i);
	      return seg_index;
	    }

	  segment = segment_manager_get_segment (sm, seg_index);
	  if (i == 0)
	    sm->event_queue = segment_manager_alloc_queue (segment,
							   props->evt_q_size);

	  svm_fifo_segment_preallocate_fifo_pairs (segment,
						   props->rx_fifo_size,
						   props->tx_fifo_size,
						   &prealloc_fifo_pairs);
	  svm_fifo_segment_flags (segment) = FIFO_SEGMENT_F_IS_PREALLOCATED;
	  if (prealloc_fifo_pairs == 0)
	    break;
	}
    }
  else
    {
      seg_index = segment_manager_add_segment (sm, first_seg_size);
      if (seg_index)
	{
	  clib_warning ("Failed to allocate segment");
	  return seg_index;
	}
      segment = segment_manager_get_segment (sm, seg_index);
      sm->event_queue = segment_manager_alloc_queue (segment,
						     props->evt_q_size);
    }

  return 0;
}

u8
segment_manager_has_fifos (segment_manager_t * sm)
{
  svm_fifo_segment_private_t *seg;
  u8 first = 1;

  /* *INDENT-OFF* */
  segment_manager_foreach_segment_w_lock (seg, sm, ({
    if (CLIB_DEBUG && !first && !svm_fifo_segment_has_fifos (seg)
	&& !(svm_fifo_segment_flags (seg) & FIFO_SEGMENT_F_IS_PREALLOCATED))
      {
	clib_warning ("segment %d has no fifos!",
	              segment_manager_segment_index (sm, seg));
	first = 0;
      }
    if (svm_fifo_segment_has_fifos (seg))
      {
	segment_manager_segment_reader_unlock (sm);
	return 1;
      }
  }));
  /* *INDENT-ON* */

  return 0;
}

/**
 * Initiate disconnects for all sessions 'owned' by a segment manager
 */
void
segment_manager_del_sessions (segment_manager_t * sm)
{
  svm_fifo_segment_private_t *fifo_segment;
  stream_session_t *session;
  svm_fifo_t *fifo;

  ASSERT (pool_elts (sm->segments) != 0);

  /* Across all fifo segments used by the server */
  /* *INDENT-OFF* */
  segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
    fifo = svm_fifo_segment_get_fifo_list (fifo_segment);

    /*
     * Remove any residual sessions from the session lookup table
     * Don't bother deleting the individual fifos, we're going to
     * throw away the fifo segment in a minute.
     */
    while (fifo)
      {
	if (fifo->master_thread_index == 255)
	  {
	    svm_fifo_t *next = fifo->next;
	    application_local_session_disconnect_w_index (sm->app_index,
	                                                  fifo->master_session_index);
	    fifo = next;
	    continue;
	  }
	session = session_get (fifo->master_session_index,
	                       fifo->master_thread_index);
	stream_session_disconnect (session);
	fifo = fifo->next;
      }

    /* Instead of removing the segment, test when cleaning up disconnected
     * sessions if the segment can be removed.
     */
  }));
  /* *INDENT-ON* */
}

/**
 * Removes segment manager.
 *
 * Since the fifos allocated in the segment keep backpointers to the sessions
 * prior to removing the segment, we call session disconnect. This
 * subsequently propagates into transport.
 */
void
segment_manager_del (segment_manager_t * sm)
{
  segment_manager_main_t *smm = &segment_manager_main;
  svm_fifo_segment_private_t *fifo_segment;

  ASSERT (!segment_manager_has_fifos (sm)
	  && segment_manager_app_detached (sm));

  /* If we have empty preallocated segments that haven't been removed, remove
   * them now. Apart from that, the first segment in the first segment manager
   * is not removed when all fifos are removed. It can only be removed when
   * the manager is explicitly deleted/detached by the app. */
  clib_rwlock_writer_lock (&sm->segments_rwlock);

  /* *INDENT-OFF* */
  pool_foreach (fifo_segment, sm->segments, ({
    segment_manager_del_segment (sm, fifo_segment);
  }));
  /* *INDENT-ON* */

  clib_rwlock_writer_unlock (&sm->segments_rwlock);

  clib_rwlock_free (&sm->segments_rwlock);
  if (CLIB_DEBUG)
    memset (sm, 0xfe, sizeof (*sm));
  pool_put (smm->segment_managers, sm);
}

void
segment_manager_init_del (segment_manager_t * sm)
{
  segment_manager_app_detach (sm);
  if (segment_manager_has_fifos (sm))
    segment_manager_del_sessions (sm);
  else
    {
      ASSERT (!sm->first_is_protected || segment_manager_app_detached (sm));
      segment_manager_del (sm);
    }
}

int
segment_manager_try_alloc_fifos (svm_fifo_segment_private_t * fifo_segment,
				 u32 rx_fifo_size, u32 tx_fifo_size,
				 svm_fifo_t ** rx_fifo, svm_fifo_t ** tx_fifo)
{
  rx_fifo_size = clib_max (rx_fifo_size, default_fifo_size);
  *rx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, rx_fifo_size,
					  FIFO_SEGMENT_RX_FREELIST);

  tx_fifo_size = clib_max (tx_fifo_size, default_fifo_size);
  *tx_fifo = svm_fifo_segment_alloc_fifo (fifo_segment, tx_fifo_size,
					  FIFO_SEGMENT_TX_FREELIST);

  if (*rx_fifo == 0)
    {
      /* This would be very odd, but handle it... */
      if (*tx_fifo != 0)
	{
	  svm_fifo_segment_free_fifo (fifo_segment, *tx_fifo,
				      FIFO_SEGMENT_TX_FREELIST);
	  *tx_fifo = 0;
	}
      return -1;
    }
  if (*tx_fifo == 0)
    {
      if (*rx_fifo != 0)
	{
	  svm_fifo_segment_free_fifo (fifo_segment, *rx_fifo,
				      FIFO_SEGMENT_RX_FREELIST);
	  *rx_fifo = 0;
	}
      return -1;
    }

  return 0;
}

int
segment_manager_alloc_session_fifos (segment_manager_t * sm,
				     svm_fifo_t ** rx_fifo,
				     svm_fifo_t ** tx_fifo,
				     u32 * fifo_segment_index)
{
  svm_fifo_segment_private_t *fifo_segment = 0;
  int alloc_fail = 1, rv = 0, new_fs_index;
  segment_manager_properties_t *props;
  u8 added_a_segment = 0;
  u32 sm_index;

  props = segment_manager_properties_get (sm);

  /*
   * Find the first free segment to allocate the fifos in
   */

  /* *INDENT-OFF* */
  segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
    alloc_fail = segment_manager_try_alloc_fifos (fifo_segment,
                                                  props->rx_fifo_size,
                                                  props->tx_fifo_size,
                                                  rx_fifo, tx_fifo);
    /* Exit with lock held, drop it after notifying app */
    if (!alloc_fail)
      goto alloc_success;
  }));
  /* *INDENT-ON* */

alloc_check:

  if (!alloc_fail)
    {

    alloc_success:

      ASSERT (rx_fifo && tx_fifo);
      sm_index = segment_manager_index (sm);
      (*tx_fifo)->segment_manager = sm_index;
      (*rx_fifo)->segment_manager = sm_index;
      *fifo_segment_index = segment_manager_segment_index (sm, fifo_segment);

      if (added_a_segment)
	rv = application_add_segment_notify (sm->app_index,
					     &fifo_segment->ssvm);
      /* Drop the lock after app is notified */
      segment_manager_segment_reader_unlock (sm);
      return rv;
    }

  /*
   * Allocation failed, see if we can add a new segment
   */
  if (props->add_segment)
    {
      if (added_a_segment)
	{
	  clib_warning ("Added a segment, still can't allocate a fifo");
	  segment_manager_segment_reader_unlock (sm);
	  return SESSION_ERROR_NEW_SEG_NO_SPACE;
	}
      if ((new_fs_index = segment_manager_add_segment (sm, 0)) < 0)
	{
	  clib_warning ("Failed to add new segment");
	  return SESSION_ERROR_SEG_CREATE;
	}
      fifo_segment = segment_manager_get_segment_w_lock (sm, new_fs_index);
      alloc_fail = segment_manager_try_alloc_fifos (fifo_segment,
						    props->rx_fifo_size,
						    props->tx_fifo_size,
						    rx_fifo, tx_fifo);
      added_a_segment = 1;
      goto alloc_check;
    }
  else
    {
      clib_warning ("Can't add new seg and no space to allocate fifos!");
      return SESSION_ERROR_NO_SPACE;
    }
}

void
segment_manager_dealloc_fifos (u32 segment_index, svm_fifo_t * rx_fifo,
			       svm_fifo_t * tx_fifo)
{
  svm_fifo_segment_private_t *fifo_segment;
  segment_manager_t *sm;

  /* It's possible to have no segment manager if the session was removed
   * as result of a detach. */
  if (!(sm = segment_manager_get_if_valid (rx_fifo->segment_manager)))
    return;

  fifo_segment = segment_manager_get_segment_w_lock (sm, segment_index);
  svm_fifo_segment_free_fifo (fifo_segment, rx_fifo,
			      FIFO_SEGMENT_RX_FREELIST);
  svm_fifo_segment_free_fifo (fifo_segment, tx_fifo,
			      FIFO_SEGMENT_TX_FREELIST);

  /*
   * Try to remove svm segment if it has no fifos. This can be done only if
   * the segment is not the first in the segment manager or if it is first
   * and it is not protected. Moreover, if the segment is first and the app
   * has detached from the segment manager, remove the segment manager.
   */
  if (!svm_fifo_segment_has_fifos (fifo_segment))
    {
      segment_manager_segment_reader_unlock (sm);

      /* Remove segment if it holds no fifos or first but not protected */
      if (segment_index != 0 || !sm->first_is_protected)
	segment_manager_lock_and_del_segment (sm, segment_index);

      /* Remove segment manager if no sessions and detached from app */
      if (segment_manager_app_detached (sm)
	  && !segment_manager_has_fifos (sm))
	segment_manager_del (sm);
    }
  else
    segment_manager_segment_reader_unlock (sm);
}

/**
 * Allocates shm queue in the first segment
 *
 * Must be called with lock held
 */
svm_queue_t *
segment_manager_alloc_queue (svm_fifo_segment_private_t * segment,
			     u32 queue_size)
{
  ssvm_shared_header_t *sh;
  svm_queue_t *q;
  void *oldheap;

  sh = segment->ssvm.sh;

  oldheap = ssvm_push_heap (sh);
  q = svm_queue_init (queue_size, sizeof (session_fifo_event_t),
		      0 /* consumer pid */ ,
		      0 /* signal when queue non-empty */ );
  ssvm_pop_heap (oldheap);
  return q;
}

/**
 * Frees shm queue allocated in the first segment
 */
void
segment_manager_dealloc_queue (segment_manager_t * sm, svm_queue_t * q)
{
  svm_fifo_segment_private_t *segment;
  ssvm_shared_header_t *sh;
  void *oldheap;

  ASSERT (!pool_is_free_index (sm->segments, 0));

  segment = segment_manager_get_segment_w_lock (sm, 0);
  sh = segment->ssvm.sh;

  oldheap = ssvm_push_heap (sh);
  svm_queue_free (q);
  ssvm_pop_heap (oldheap);
  segment_manager_segment_reader_unlock (sm);
}

/*
 * Init segment vm address allocator
 */
void
segment_manager_main_init (segment_manager_main_init_args_t * a)
{
  segment_manager_main_t *sm = &segment_manager_main;
  clib_valloc_chunk_t _ip, *ip = &_ip;

  ip->baseva = a->baseva;
  ip->size = a->size;

  clib_valloc_init (&sm->va_allocator, ip, 1 /* lock */ );
}

static clib_error_t *
segment_manager_show_fn (vlib_main_t * vm, unformat_input_t * input,
			 vlib_cli_command_t * cmd)
{
  segment_manager_main_t *smm = &segment_manager_main;
  svm_fifo_segment_private_t *seg;
  segment_manager_t *sm;
  u8 show_segments = 0, verbose = 0;
  uword address;
  u64 size;
  u32 active_fifos;
  u32 free_fifos;

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "segments"))
	show_segments = 1;
      else if (unformat (input, "verbose"))
	verbose = 1;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }
  vlib_cli_output (vm, "%d segment managers allocated",
		   pool_elts (smm->segment_managers));
  if (verbose && pool_elts (smm->segment_managers))
    {
      vlib_cli_output (vm, "%-10s%=15s%=12s", "Index", "App Index",
		       "Segments");

      /* *INDENT-OFF* */
      pool_foreach (sm, smm->segment_managers, ({
	vlib_cli_output (vm, "%-10d%=15d%=12d", segment_manager_index(sm),
			   sm->app_index, pool_elts (sm->segments));
      }));
      /* *INDENT-ON* */

    }
  if (show_segments)
    {
      vlib_cli_output (vm, "%-15s%15s%15s%15s%15s%15s", "Name", "Type",
		       "HeapSize (M)", "ActiveFifos", "FreeFifos", "Address");

      /* *INDENT-OFF* */
      pool_foreach (sm, smm->segment_managers, ({
	  segment_manager_foreach_segment_w_lock (seg, sm, ({
	    svm_fifo_segment_info (seg, &address, &size);
	    active_fifos = svm_fifo_segment_num_fifos (seg);
	    free_fifos = svm_fifo_segment_num_free_fifos (seg, ~0 /* size */);
	    vlib_cli_output (vm, "%-15v%15U%15llu%15u%15u%15llx",
			     ssvm_name (&seg->ssvm), format_svm_fifo_segment_type,
			     seg, size >> 20ULL, active_fifos, free_fifos,
			     address);
	    if (verbose)
	      vlib_cli_output (vm, "%U", format_svm_fifo_segment, seg, verbose);
	  }));
      }));
      /* *INDENT-ON* */

    }
  return 0;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (segment_manager_show_command, static) =
{
  .path = "show segment-manager",
  .short_help = "show segment-manager [segments][verbose]",
  .function = segment_manager_show_fn,
};
/* *INDENT-ON* */

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