aboutsummaryrefslogtreecommitdiffstats
path: root/src/vpp-api/vom/hw.hpp
blob: 77ae5c36e750b7d1cf4e8effd98fa7bc692d6a26 (plain)
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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
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
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
/*
 * 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.
 */

#ifndef __VOM_HW_H__
#define __VOM_HW_H__

#include <deque>
#include <map>
#include <sstream>
#include <string>
#include <thread>

#include "vom/connection.hpp"
#include "vom/types.hpp"

namespace VOM {

class cmd;
class HW
{
public:
  /**
   * A HW::item is data that is either to be written to or read from
   * VPP/HW.
   * The item is a pair of the data written/read and the result of that
   * operation.
   */
  template <typename T>
  class item
  {
  public:
    /**
     * Constructor
     */
    item(const T& data)
      : item_data(data)
      , item_rc(rc_t::NOOP)
    {
    }
    /**
     * Constructor
     */
    item()
      : item_data()
      , item_rc(rc_t::UNSET)
    {
    }

    /**
     * Constructor
     */
    item(rc_t rc)
      : item_data()
      , item_rc(rc)
    {
    }

    /**
     * Constructor
     */
    item(const T& data, rc_t rc)
      : item_data(data)
      , item_rc(rc)
    {
    }

    /**
     * Destructor
     */
    ~item() = default;

    /**
     * Comparison operator
     */
    bool operator==(const item<T>& i) const
    {
      return (item_data == i.item_data);
    }

    /**
     * Copy assignment
     */
    item& operator=(const item& other)
    {
      item_data = other.item_data;
      item_rc = other.item_rc;

      return (*this);
    }

    /**
     * Return the data read/written
     */
    T& data() { return (item_data); }

    /**
     * Const reference to the data
     */
    const T& data() const { return (item_data); }

    /**
     * Get the HW return code
     */
    rc_t rc() const { return (item_rc); }

    /**
     * Set the HW return code - should only be called from the
     * family of Command objects
     */
    void set(const rc_t& rc) { item_rc = rc; }

    /**
     * Return true if the HW item is configred in HW
     */
    operator bool() const { return (rc_t::OK == item_rc); }

    /**
     * update the item to the desired state.
     *  return true if a HW update is required
     */
    bool update(const item& desired)
    {
      bool need_hw_update = false;

      /*
       * if the deisred set is unset (i.e. defaulted, we've
       * no update to make
       */
      if (rc_t::UNSET == desired.rc()) {
        return (false);
      }
      /*
       * A HW update is needed if thestate is different
       * or the state is not yet in HW
       */
      need_hw_update = (item_data != desired.data() || rc_t::OK != rc());

      item_data = desired.data();

      return (need_hw_update);
    }

    /**
     * convert to string format for debug purposes
     */
    std::string to_string() const
    {
      std::ostringstream os;

      os << "hw-item:["
         << "rc:" << item_rc.to_string() << " data:" << item_data.to_string()
         << "]";

      return (os.str());
    }

  private:
    /**
     * The data
     */
    T item_data;

    /**
     * The result when the item was written
     */
    rc_t item_rc;
  };

  /**
   * The pipe to VPP into which we write the commands
   */
  class cmd_q
  {
  public:
    /**
     * Constructor
     */
    cmd_q();
    /**
     * Destructor
     */
    ~cmd_q();

    /**
     * Copy assignement - only used in UT
     */
    cmd_q& operator=(const cmd_q& f);

    /**
     * Enqueue a command into the Q.
     */
    virtual void enqueue(cmd* c);
    /**
     * Enqueue a command into the Q.
     */
    virtual void enqueue(std::shared_ptr<cmd> c);

    /**
     * Enqueue a set of commands
     */
    virtual void enqueue(std::queue<cmd*>& c);

    /**
     * dequeue a command from the Q.
     */
    virtual void dequeue(cmd* c);

    /**
     * dequeue a command from the Q.
     */
    virtual void dequeue(std::shared_ptr<cmd> c);

    /**
     * Write all the commands to HW
     */
    virtual rc_t write();

    /**
     * Blocking Connect to VPP - call once at bootup
     */
    void connect();

    /**
     * Disable the passing of commands to VPP. Whilst disabled all
     * writes will be discarded. Use this during the reset phase.
     */
    void disable();

    /**
     * Enable the passing of commands to VPP - undoes the disable.
     * The Q is enabled by default.
     */
    void enable();

  private:
    /**
     * A queue of enqueued commands, ready to be written
     */
    std::deque<std::shared_ptr<cmd>> m_queue;

    /**
     * A map of issued, but uncompleted, commands.
     *  i.e. those that we are waiting, async stylee,
     * for VPP to complete
     */
    std::map<cmd*, std::shared_ptr<cmd>> m_pending;

    /**
     * VPP Q poll function
     */
    void rx_run();

    /**
     * The thread object running the poll/dispatch/connect thread
     */
    std::unique_ptr<std::thread> m_rx_thread;

    /**
     * A flag indicating the client has disabled the cmd Q.
     */
    bool m_enabled;

    /**
     * A flag for the thread to poll to see if the queue is still alive
     */
    bool m_connected;

    /**
     * The connection to VPP
     */
    connection m_conn;
  };

  /**
   * Initialise the HW connection to VPP - the UT version passing
   * a mock Q.
   */
  static void init(cmd_q* f);

  /**
   * Initialise the HW
   */
  static void init();

  /**
   * Enqueue A command for execution
   */
  static void enqueue(cmd* f);

  /**
   * Enqueue A command for execution
   */
  static void enqueue(std::shared_ptr<cmd> c);

  /**
   * Enqueue A set of commands for execution
   */
  static void enqueue(std::queue<cmd*>& c);

  /**
   * dequeue A command for execution
   */
  static void dequeue(cmd* f);

  /**
   * dequeue A command for execution
   */
  static void dequeue(std::shared_ptr<cmd> c);

  /**
   * Write/Execute all commands hitherto enqueued.
   */
  static rc_t write();

  /**
   * Blocking Connect to VPP
   */
  static void connect();

  /**
   * Blocking pool of the HW connection
   */
  static bool poll();

private:
  /**
   * The command Q toward HW
   */
  static cmd_q* m_cmdQ;

  /**
   * HW::item representing the connection state as determined by polling
   */
  static HW::item<bool> m_poll_state;

  /**
   * Disable the passing of commands to VPP. Whilst disabled all writes
   * will be discarded. Use this during the reset phase.
   */
  static void disable();

  /**
   * Enable the passing of commands to VPP - undoes the disable.
   * The Q is enabled by default.
   */
  static void enable();

  /**
   * Only the OM can enable/disable HW
   */
  friend class OM;
};

/**
 * bool Specialisation for HW::item to_string
 */
template <>
std::string HW::item<bool>::to_string() const;

/**
 * uint Specialisation for HW::item to_string
 */
template <>
std::string HW::item<unsigned int>::to_string() const;
};

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

#endif