board/evb64260/eth_addrtbl.c

   1 #include <common.h>
   2 #include <malloc.h>
   3 #include <galileo/gt64260R.h>
   4 #include <galileo/core.h>
   5 #include <asm/cache.h>
   6 #include "eth.h"
   7 #include "eth_addrtbl.h"
   8
   9 #define PRINTF printf
  10
  11 #ifdef CONFIG_GT_USE_MAC_HASH_TABLE
  12
  13 static u32 addressTableHashMode[GAL_ETH_DEVS] = { 0, };
  14 static u32 addressTableHashSize[GAL_ETH_DEVS] = { 0, };
  15 static addrTblEntry *addressTableBase[GAL_ETH_DEVS] = { 0, };
  16 static void *realAddrTableBase[GAL_ETH_DEVS] = { 0, };
  17
  18 static const u32 hashLength[2] = {
  19         (0x8000),               /* 8K * 4 entries */
  20         (0x8000 / 16),          /* 512 * 4 entries */
  21 };
  22
  23 /* Initialize the address table for a port, if needed */
  24 unsigned int initAddressTable (u32 port, u32 hashMode, u32 hashSizeSelector)
  25 {
  26         unsigned int tableBase;
  27
  28         if (port < 0 || port >= GAL_ETH_DEVS) {
  29                 printf ("%s: Invalid port number %d\n", __FUNCTION__, port);
  30                 return 0;
  31         }
  32
  33         if (hashMode > 1) {
  34                 printf ("%s: Invalid Hash Mode %d\n", __FUNCTION__, port);
  35                 return 0;
  36         }
  37
  38         if (realAddrTableBase[port] &&
  39             (addressTableHashSize[port] != hashSizeSelector)) {
  40                 /* we have been here before,
  41                  * but now we want a different sized table
  42                  */
  43                 free (realAddrTableBase[port]);
  44                 realAddrTableBase[port] = 0;
  45                 addressTableBase[port] = 0;
  46
  47         }
  48
  49         tableBase = (unsigned int) addressTableBase[port];
  50         /* we get called for every probe, so only do this once */
  51         if (!tableBase) {
  52                 int bytes =
  53                         hashLength[hashSizeSelector] * sizeof (addrTblEntry);
  54
  55                 realAddrTableBase[port] =
  56                         malloc (bytes + 64);
  57                 tableBase = (unsigned int)realAddrTableBase;
  58
  59                 if (!tableBase) {
  60                         printf ("%s: alloc memory failed \n", __FUNCTION__);
  61                         return 0;
  62                 }
  63
  64                 /* align to octal byte */
  65                 if (tableBase & 63)
  66                         tableBase = (tableBase + 63) & ~63;
  67
  68                 addressTableHashMode[port] = hashMode;
  69                 addressTableHashSize[port] = hashSizeSelector;
  70                 addressTableBase[port] = (addrTblEntry *) tableBase;
  71
  72                 memset ((void *) tableBase, 0, bytes);
  73         }
  74
  75         return tableBase;
  76 }
  77
  78 /*
  79  * ----------------------------------------------------------------------------
  80  * This function will calculate the hash function of the address.
  81  * depends on the hash mode and hash size.
  82  * Inputs
  83  * macH             - the 2 most significant bytes of the MAC address.
  84  * macL             - the 4 least significant bytes of the MAC address.
  85  * hashMode         - hash mode 0 or hash mode 1.
  86  * hashSizeSelector - indicates number of hash table entries (0=0x8000,1=0x800)
  87  * Outputs
  88  * return the calculated entry.
  89  */
  90 u32 hashTableFunction (u32 macH, u32 macL, u32 HashSize, u32 hash_mode)
  91 {
  92         u32 hashResult;
  93         u32 addrH;
  94         u32 addrL;
  95         u32 addr0;
  96         u32 addr1;
  97         u32 addr2;
  98         u32 addr3;
  99         u32 addrHSwapped;
 100         u32 addrLSwapped;
 101
 102
 103         addrH = NIBBLE_SWAPPING_16_BIT (macH);
 104         addrL = NIBBLE_SWAPPING_32_BIT (macL);
 105
 106         addrHSwapped = FLIP_4_BITS (addrH & 0xf)
 107                 + ((FLIP_4_BITS ((addrH >> 4) & 0xf)) << 4)
 108                 + ((FLIP_4_BITS ((addrH >> 8) & 0xf)) << 8)
 109                 + ((FLIP_4_BITS ((addrH >> 12) & 0xf)) << 12);
 110
 111         addrLSwapped = FLIP_4_BITS (addrL & 0xf)
 112                 + ((FLIP_4_BITS ((addrL >> 4) & 0xf)) << 4)
 113                 + ((FLIP_4_BITS ((addrL >> 8) & 0xf)) << 8)
 114                 + ((FLIP_4_BITS ((addrL >> 12) & 0xf)) << 12)
 115                 + ((FLIP_4_BITS ((addrL >> 16) & 0xf)) << 16)
 116                 + ((FLIP_4_BITS ((addrL >> 20) & 0xf)) << 20)
 117                 + ((FLIP_4_BITS ((addrL >> 24) & 0xf)) << 24)
 118                 + ((FLIP_4_BITS ((addrL >> 28) & 0xf)) << 28);
 119
 120         addrH = addrHSwapped;
 121         addrL = addrLSwapped;
 122
 123         if (hash_mode == 0) {
 124                 addr0 = (addrL >> 2) & 0x03f;
 125                 addr1 = (addrL & 0x003) | ((addrL >> 8) & 0x7f) << 2;
 126                 addr2 = (addrL >> 15) & 0x1ff;
 127                 addr3 = ((addrL >> 24) & 0x0ff) | ((addrH & 1) << 8);
 128         } else {
 129                 addr0 = FLIP_6_BITS (addrL & 0x03f);
 130                 addr1 = FLIP_9_BITS (((addrL >> 6) & 0x1ff));
 131                 addr2 = FLIP_9_BITS ((addrL >> 15) & 0x1ff);
 132                 addr3 = FLIP_9_BITS ((((addrL >> 24) & 0x0ff) |
 133                                       ((addrH & 0x1) << 8)));
 134         }
 135
 136         hashResult = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
 137
 138         if (HashSize == _8K_TABLE) {
 139                 hashResult = hashResult & 0xffff;
 140         } else {
 141                 hashResult = hashResult & 0x07ff;
 142         }
 143
 144         return (hashResult);
 145 }
 146
 147
 148 /*
 149  * ----------------------------------------------------------------------------
 150  * This function will add an entry to the address table.
 151  * depends on the hash mode and hash size that was initialized.
 152  * Inputs
 153  * port - ETHERNET port number.
 154  * macH - the 2 most significant bytes of the MAC address.
 155  * macL - the 4 least significant bytes of the MAC address.
 156  * skip - if 1, skip this address.
 157  * rd   - the RD field in the address table.
 158  * Outputs
 159  * address table entry is added.
 160  * true if success.
 161  * false if table full
 162  */
 163 int addAddressTableEntry (u32 port, u32 macH, u32 macL, u32 rd, u32 skip)
 164 {
 165         addrTblEntry *entry;
 166         u32 newHi;
 167         u32 newLo;
 168         u32 i;
 169
 170         newLo = (((macH >> 4) & 0xf) << 15)
 171                 | (((macH >> 0) & 0xf) << 11)
 172                 | (((macH >> 12) & 0xf) << 7)
 173                 | (((macH >> 8) & 0xf) << 3)
 174                 | (((macL >> 20) & 0x1) << 31)
 175                 | (((macL >> 16) & 0xf) << 27)
 176                 | (((macL >> 28) & 0xf) << 23)
 177                 | (((macL >> 24) & 0xf) << 19)
 178                 | (skip << SKIP_BIT) | (rd << 2) | VALID;
 179
 180         newHi = (((macL >> 4) & 0xf) << 15)
 181                 | (((macL >> 0) & 0xf) << 11)
 182                 | (((macL >> 12) & 0xf) << 7)
 183                 | (((macL >> 8) & 0xf) << 3)
 184                 | (((macL >> 21) & 0x7) << 0);
 185
 186         /*
 187          * Pick the appropriate table, start scanning for free/reusable
 188          * entries at the index obtained by hashing the specified MAC address
 189          */
 190         entry = addressTableBase[port];
 191         entry += hashTableFunction (macH, macL, addressTableHashSize[port],
 192                                     addressTableHashMode[port]);
 193         for (i = 0; i < HOP_NUMBER; i++, entry++) {
 194                 if (!(entry->lo & VALID) /*|| (entry->lo & SKIP) */ ) {
 195                         break;
 196                 } else {        /* if same address put in same position */
 197                         if (((entry->lo & 0xfffffff8) == (newLo & 0xfffffff8))
 198                             && (entry->hi == newHi)) {
 199                                 break;
 200                         }
 201                 }
 202         }
 203
 204         if (i == HOP_NUMBER) {
 205                 PRINTF ("addGT64260addressTableEntry: table section is full\n");
 206                 return false;
 207         }
 208
 209         /*
 210          * Update the selected entry
 211          */
 212         entry->hi = newHi;
 213         entry->lo = newLo;
 214         DCACHE_FLUSH_N_SYNC ((u32) entry, MAC_ENTRY_SIZE);
 215         return true;
 216 }
 217
 218 #endif /* CONFIG_GT_USE_MAC_HASH_TABLE */