summaryrefslogtreecommitdiff
path: root/drivers/net/npe/IxEthDBMem.c
blob: 78fce4bd9247593c2ccc0d78cb8eebf174682f70 (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
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
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
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
/**
 * @file IxEthDBDBMem.c
 *
 * @brief Memory handling routines for the MAC address database
 * 
 * @par
 * IXP400 SW Release version 2.0
 * 
 * -- Copyright Notice --
 * 
 * @par
 * Copyright 2001-2005, Intel Corporation.
 * All rights reserved.
 * 
 * @par
 * SPDX-License-Identifier:	BSD-3-Clause
 * @par
 * -- End of Copyright Notice --
 */


#include "IxEthDB_p.h"

IX_ETH_DB_PRIVATE HashNode *nodePool     = NULL;
IX_ETH_DB_PRIVATE MacDescriptor *macPool = NULL;
IX_ETH_DB_PRIVATE MacTreeNode *treePool  = NULL;

IX_ETH_DB_PRIVATE HashNode nodePoolArea[NODE_POOL_SIZE];
IX_ETH_DB_PRIVATE MacDescriptor macPoolArea[MAC_POOL_SIZE];
IX_ETH_DB_PRIVATE MacTreeNode treePoolArea[TREE_POOL_SIZE];

IX_ETH_DB_PRIVATE IxOsalMutex nodePoolLock;
IX_ETH_DB_PRIVATE IxOsalMutex macPoolLock;
IX_ETH_DB_PRIVATE IxOsalMutex treePoolLock;

#define LOCK_NODE_POOL   { ixOsalMutexLock(&nodePoolLock, IX_OSAL_WAIT_FOREVER); }
#define UNLOCK_NODE_POOL { ixOsalMutexUnlock(&nodePoolLock); }

#define LOCK_MAC_POOL    { ixOsalMutexLock(&macPoolLock, IX_OSAL_WAIT_FOREVER); }
#define UNLOCK_MAC_POOL  { ixOsalMutexUnlock(&macPoolLock); }

#define LOCK_TREE_POOL   { ixOsalMutexLock(&treePoolLock, IX_OSAL_WAIT_FOREVER); }
#define UNLOCK_TREE_POOL { ixOsalMutexUnlock(&treePoolLock); }

/* private function prototypes */
IX_ETH_DB_PRIVATE MacDescriptor* ixEthDBPoolAllocMacDescriptor(void);
IX_ETH_DB_PRIVATE void ixEthDBPoolFreeMacDescriptor(MacDescriptor *macDescriptor);

/**
 * @addtogroup EthMemoryManagement
 *
 * @{
 */

/**
 * @brief initializes the memory pools used by the ethernet database component
 *
 * Initializes the hash table node, mac descriptor and mac tree node pools.
 * Called at initialization time by @ref ixEthDBInit().
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
void ixEthDBInitMemoryPools(void)
{
    int local_index;

    /* HashNode pool */
    ixOsalMutexInit(&nodePoolLock);

    for (local_index = 0 ; local_index < NODE_POOL_SIZE ; local_index++)
    {
        HashNode *freeNode = &nodePoolArea[local_index];

        freeNode->nextFree = nodePool;
        nodePool           = freeNode;
    }

    /* MacDescriptor pool */
    ixOsalMutexInit(&macPoolLock);

    for (local_index = 0 ; local_index < MAC_POOL_SIZE ; local_index++)
    {
        MacDescriptor *freeDescriptor = &macPoolArea[local_index];

        freeDescriptor->nextFree = macPool;
        macPool                  = freeDescriptor;
    }

    /* MacTreeNode pool */
    ixOsalMutexInit(&treePoolLock);

    for (local_index = 0 ; local_index < TREE_POOL_SIZE ; local_index++)
    {
        MacTreeNode *freeNode = &treePoolArea[local_index];

        freeNode->nextFree = treePool;
        treePool           = freeNode;
    }
}

/**
 * @brief allocates a hash node from the pool
 *
 * Allocates a hash node and resets its value.
 *
 * @return the allocated hash node or NULL if the pool is empty
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
HashNode* ixEthDBAllocHashNode(void)
{
    HashNode *allocatedNode = NULL;

    if (nodePool != NULL)
    {
        LOCK_NODE_POOL;

        allocatedNode = nodePool;
        nodePool      = nodePool->nextFree;

        UNLOCK_NODE_POOL;

        memset(allocatedNode, 0, sizeof(HashNode));
    }

    return allocatedNode;
}

/**
 * @brief frees a hash node into the pool
 *
 * @param hashNode node to be freed
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
void ixEthDBFreeHashNode(HashNode *hashNode)
{
    if (hashNode != NULL)
    {
        LOCK_NODE_POOL;

        hashNode->nextFree = nodePool;
        nodePool           = hashNode;

        UNLOCK_NODE_POOL;
    }
}

/**
 * @brief allocates a mac descriptor from the pool
 *
 * Allocates a mac descriptor and resets its value.
 * This function is not used directly, instead @ref ixEthDBAllocMacDescriptor()
 * is used, which keeps track of the pointer reference count.
 *
 * @see ixEthDBAllocMacDescriptor()
 * 
 * @warning this function is not used directly by any other function
 * apart from ixEthDBAllocMacDescriptor()
 *
 * @return the allocated mac descriptor or NULL if the pool is empty
 *
 * @internal
 */
IX_ETH_DB_PRIVATE
MacDescriptor* ixEthDBPoolAllocMacDescriptor(void)
{
    MacDescriptor *allocatedDescriptor = NULL;

    if (macPool != NULL)
    {
        LOCK_MAC_POOL;

        allocatedDescriptor = macPool;
        macPool             = macPool->nextFree;

        UNLOCK_MAC_POOL;

        memset(allocatedDescriptor, 0, sizeof(MacDescriptor));
    }

    return allocatedDescriptor;
}

/**
 * @brief allocates and initializes a mac descriptor smart pointer
 *
 * Uses @ref ixEthDBPoolAllocMacDescriptor() to allocate a mac descriptor
 * from the pool and initializes its reference count.
 *
 * @see ixEthDBPoolAllocMacDescriptor()
 *
 * @return the allocated mac descriptor or NULL if the pool is empty
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
MacDescriptor* ixEthDBAllocMacDescriptor(void)
{
    MacDescriptor *allocatedDescriptor = ixEthDBPoolAllocMacDescriptor();

    if (allocatedDescriptor != NULL)
    {
        LOCK_MAC_POOL;

        allocatedDescriptor->refCount++;

        UNLOCK_MAC_POOL;
    }

    return allocatedDescriptor;
}

/**
 * @brief frees a mac descriptor back into the pool
 *
 * @param macDescriptor mac descriptor to be freed
 *
 * @warning this function is not to be called by anyone but
 * ixEthDBFreeMacDescriptor()
 *
 * @see ixEthDBFreeMacDescriptor()
 *
 * @internal
 */
IX_ETH_DB_PRIVATE
void ixEthDBPoolFreeMacDescriptor(MacDescriptor *macDescriptor)
{
    LOCK_MAC_POOL;

    macDescriptor->nextFree = macPool;
    macPool                 = macDescriptor;

    UNLOCK_MAC_POOL;
}

/**
 * @brief frees or reduces the usage count of a mac descriptor smart pointer
 *
 * If the reference count reaches 0 (structure is no longer used anywhere)
 * then the descriptor is freed back into the pool using ixEthDBPoolFreeMacDescriptor().
 *
 * @see ixEthDBPoolFreeMacDescriptor()
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
void ixEthDBFreeMacDescriptor(MacDescriptor *macDescriptor)
{
    if (macDescriptor != NULL)
    {
        LOCK_MAC_POOL;

        if (macDescriptor->refCount > 0)
        {
            macDescriptor->refCount--;

            if (macDescriptor->refCount == 0)
            {
                UNLOCK_MAC_POOL;

                ixEthDBPoolFreeMacDescriptor(macDescriptor);
            }
            else
            {
                UNLOCK_MAC_POOL;
            }
        }
        else
        {
            UNLOCK_MAC_POOL;
        }
    }
}

/**
 * @brief clones a mac descriptor smart pointer
 *
 * @param macDescriptor mac descriptor to clone
 *
 * Increments the usage count of the smart pointer
 *
 * @returns the cloned smart pointer
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
MacDescriptor* ixEthDBCloneMacDescriptor(MacDescriptor *macDescriptor)
{
    LOCK_MAC_POOL;

    if (macDescriptor->refCount == 0)
    {
        UNLOCK_MAC_POOL;

        return NULL;
    }

    macDescriptor->refCount++;

    UNLOCK_MAC_POOL;

    return macDescriptor;
}

/**
 * @brief allocates a mac tree node from the pool
 *
 * Allocates and initializes a mac tree node from the pool.
 *
 * @return the allocated mac tree node or NULL if the pool is empty
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
MacTreeNode* ixEthDBAllocMacTreeNode(void)
{
    MacTreeNode *allocatedNode = NULL;

    if (treePool != NULL)
    {
        LOCK_TREE_POOL;

        allocatedNode = treePool;
        treePool      = treePool->nextFree;

        UNLOCK_TREE_POOL;

        memset(allocatedNode, 0, sizeof(MacTreeNode));
    }

    return allocatedNode;
}

/**
 * @brief frees a mac tree node back into the pool
 *
 * @param macNode mac tree node to be freed
 *
 * @warning not to be used except from ixEthDBFreeMacTreeNode().
 *
 * @see ixEthDBFreeMacTreeNode()
 *
 * @internal
 */
void ixEthDBPoolFreeMacTreeNode(MacTreeNode *macNode)
{
    if (macNode != NULL)
    {
        LOCK_TREE_POOL;

        macNode->nextFree = treePool;
        treePool          = macNode;

        UNLOCK_TREE_POOL;
    }
}

/**
 * @brief frees or reduces the usage count of a mac tree node smart pointer
 *
 * @param macNode mac tree node to free
 *
 * Reduces the usage count of the given mac node. If the usage count
 * reaches 0 the node is freed back into the pool using ixEthDBPoolFreeMacTreeNode()
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
void ixEthDBFreeMacTreeNode(MacTreeNode *macNode)
{
    if (macNode->descriptor != NULL)
    {
        ixEthDBFreeMacDescriptor(macNode->descriptor);
    }

    if (macNode->left != NULL)
    {
        ixEthDBFreeMacTreeNode(macNode->left);
    }

    if (macNode->right != NULL)
    {
        ixEthDBFreeMacTreeNode(macNode->right);
    }

    ixEthDBPoolFreeMacTreeNode(macNode);
}

/**
 * @brief clones a mac tree node
 *
 * @param macNode mac tree node to be cloned
 *
 * Increments the usage count of the node, <i>its associated descriptor 
 * and <b>recursively</b> of all its child nodes</i>.
 *
 * @warning this function is recursive and clones whole trees/subtrees, use only for
 * root nodes
 *
 * @internal
 */
IX_ETH_DB_PUBLIC
MacTreeNode* ixEthDBCloneMacTreeNode(MacTreeNode *macNode)
{
    if (macNode != NULL)
    {
        MacTreeNode *clonedMacNode = ixEthDBAllocMacTreeNode();

        if (clonedMacNode != NULL)
        {
            if (macNode->right != NULL)
            {
                clonedMacNode->right = ixEthDBCloneMacTreeNode(macNode->right);
            }

            if (macNode->left != NULL)
            {
                clonedMacNode->left = ixEthDBCloneMacTreeNode(macNode->left);
            }

            if (macNode->descriptor != NULL)
            {
                clonedMacNode->descriptor = ixEthDBCloneMacDescriptor(macNode->descriptor);
            }
        }

        return clonedMacNode;
    }
    else
    {
        return NULL;
    }
}

#ifndef NDEBUG
/* Debug statistical functions for memory usage */

extern HashTable dbHashtable;
int ixEthDBNumHashElements(void);

int ixEthDBNumHashElements(void)
{   
    UINT32 bucketIndex;
    int numElements = 0;
    HashTable *hashTable = &dbHashtable;

    for (bucketIndex = 0 ; bucketIndex < hashTable->numBuckets ; bucketIndex++)
    {
        if (hashTable->hashBuckets[bucketIndex] != NULL)
        {
            HashNode *node = hashTable->hashBuckets[bucketIndex];

            while (node != NULL)
            {
                numElements++;

                node = node->next;
            }
        }
    }

    return numElements;
}

UINT32 ixEthDBSearchTreeUsageGet(MacTreeNode *tree)
{
    if (tree == NULL)
    {
        return 0;
    }
    else
    {
        return 1 /* this node */ + ixEthDBSearchTreeUsageGet(tree->left) + ixEthDBSearchTreeUsageGet(tree->right);
    }
}

int ixEthDBShowMemoryStatus(void)
{
    MacDescriptor *mac;
    MacTreeNode *tree;
    HashNode *node;

    int macCounter  = 0;
    int treeCounter = 0;
    int nodeCounter = 0;

    int totalTreeUsage            = 0;
    int totalDescriptorUsage      = 0;
    int totalCloneDescriptorUsage = 0;
    int totalNodeUsage            = 0;

    UINT32 portIndex;

    LOCK_NODE_POOL;
    LOCK_MAC_POOL;
    LOCK_TREE_POOL;

    mac  = macPool;
    tree = treePool;
    node = nodePool;

    while (mac != NULL)
    {
        macCounter++;

        mac = mac->nextFree;

        if (macCounter > MAC_POOL_SIZE)
        {
            break;
        }
    }

    while (tree != NULL)
    {
        treeCounter++;

        tree = tree->nextFree;

        if (treeCounter > TREE_POOL_SIZE)
        {
            break;
        }
    }

    while (node != NULL)
    {
        nodeCounter++;

        node = node->nextFree;

        if (nodeCounter > NODE_POOL_SIZE)
        {
            break;
        }
    }

    for (portIndex = 0 ; portIndex < IX_ETH_DB_NUMBER_OF_PORTS ; portIndex++)
    {
        int treeUsage = ixEthDBSearchTreeUsageGet(ixEthDBPortInfo[portIndex].updateMethod.searchTree);

        totalTreeUsage            += treeUsage;
        totalCloneDescriptorUsage += treeUsage; /* each tree node contains a descriptor */
    }

    totalNodeUsage        = ixEthDBNumHashElements();
    totalDescriptorUsage += totalNodeUsage; /* each hash table entry contains a descriptor */

    UNLOCK_NODE_POOL;
    UNLOCK_MAC_POOL;
    UNLOCK_TREE_POOL;

    printf("Ethernet database memory usage stats:\n\n");

    if (macCounter <= MAC_POOL_SIZE)
    {
        printf("\tMAC descriptor pool  : %d free out of %d entries (%d%%)\n", macCounter, MAC_POOL_SIZE, macCounter * 100 / MAC_POOL_SIZE);
    }
    else
    {
        printf("\tMAC descriptor pool  : invalid state (ring within the pool), normally %d entries\n", MAC_POOL_SIZE);
    }

    if (treeCounter <= TREE_POOL_SIZE)
    {
	printf("\tTree node pool       : %d free out of %d entries (%d%%)\n", treeCounter, TREE_POOL_SIZE, treeCounter * 100 / TREE_POOL_SIZE);
    }
    else
    {
        printf("\tTREE descriptor pool  : invalid state (ring within the pool), normally %d entries\n", TREE_POOL_SIZE);
    }

    if (nodeCounter <= NODE_POOL_SIZE)
    {
	printf("\tHash node pool       : %d free out of %d entries (%d%%)\n", nodeCounter, NODE_POOL_SIZE, nodeCounter * 100 / NODE_POOL_SIZE);
    }
    else
    {
        printf("\tNODE descriptor pool  : invalid state (ring within the pool), normally %d entries\n", NODE_POOL_SIZE);
    }

    printf("\n");
    printf("\tMAC descriptor usage : %d entries, %d cloned\n", totalDescriptorUsage, totalCloneDescriptorUsage);
    printf("\tTree node usage      : %d entries\n", totalTreeUsage);
    printf("\tHash node usage      : %d entries\n", totalNodeUsage);
    printf("\n");

    /* search for duplicate nodes in the mac pool */
    {
        MacDescriptor *reference = macPool;

        while (reference != NULL)
        {
            MacDescriptor *comparison = reference->nextFree;

            while (comparison != NULL)
            {
                if (reference == comparison)
                {
                    printf("Warning: reached a duplicate (%p), invalid MAC pool state\n", reference);

                    return 1;
                }

                comparison = comparison->nextFree;
            }

            reference = reference->nextFree;
        }
    }

    printf("No duplicates found in the MAC pool (sanity check ok)\n");

    return 0;
}

#endif /* NDEBUG */

/**
 * @} EthMemoryManagement
 */