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 TRUE 1
  10 #define FALSE 0
  11
  12 #define PRINTF printf
  13
  14 #ifdef CONFIG_GT_USE_MAC_HASH_TABLE
  15
  16 static u32 addressTableHashMode[GAL_ETH_DEVS] = { 0, };
  17 static u32 addressTableHashSize[GAL_ETH_DEVS] = { 0, };
  18 static addrTblEntry *addressTableBase[GAL_ETH_DEVS] = { 0, };
  19 static void *realAddrTableBase[GAL_ETH_DEVS] = { 0, };
  20
  21 static const u32 hashLength[2] = {
  22         (0x8000),               /* 8K * 4 entries */
  23         (0x8000 / 16),          /* 512 * 4 entries */
  24 };
  25
  26 /* Initialize the address table for a port, if needed */
  27 unsigned int initAddressTable (u32 port, u32 hashMode, u32 hashSizeSelector)
  28 {
  29         unsigned int tableBase;
  30
  31         if (port < 0 || port >= GAL_ETH_DEVS) {
  32                 printf ("%s: Invalid port number %d\n", __FUNCTION__, port);
  33                 return 0;
  34         }
  35
  36         if (hashMode > 1) {
  37                 printf ("%s: Invalid Hash Mode %d\n", __FUNCTION__, port);
  38                 return 0;
  39         }
  40
  41         if (realAddrTableBase[port] &&
  42             (addressTableHashSize[port] != hashSizeSelector)) {
  43                 /* we have been here before,
  44                  * but now we want a different sized table
  45                  */
  46                 free (realAddrTableBase[port]);
  47                 realAddrTableBase[port] = 0;
  48                 addressTableBase[port] = 0;
  49
  50         }
  51
  52         tableBase = (unsigned int) addressTableBase[port];
  53         /* we get called for every probe, so only do this once */
  54         if (!tableBase) {
  55                 int bytes =
  56                         hashLength[hashSizeSelector] * sizeof (addrTblEntry);
  57
  58                 realAddrTableBase[port] =
  59                         malloc (bytes + 64);
  60                 tableBase = (unsigned int)realAddrTableBase;
  61
  62                 if (!tableBase) {
  63                         printf ("%s: alloc memory failed \n", __FUNCTION__);
  64                         return 0;
  65                 }
  66
  67                 /* align to octal byte */
  68                 if (tableBase & 63)
  69                         tableBase = (tableBase + 63) & ~63;
  70
  71                 addressTableHashMode[port] = hashMode;
  72                 addressTableHashSize[port] = hashSizeSelector;
  73                 addressTableBase[port] = (addrTblEntry *) tableBase;
  74
  75                 memset ((void *) tableBase, 0, bytes);
  76         }
  77
  78         return tableBase;
  79 }
  80
  81 /*
  82  * ----------------------------------------------------------------------------
  83  * This function will calculate the hash function of the address.
  84  * depends on the hash mode and hash size.
  85  * Inputs
  86  * macH             - the 2 most significant bytes of the MAC address.
  87  * macL             - the 4 least significant bytes of the MAC address.
  88  * hashMode         - hash mode 0 or hash mode 1.
  89  * hashSizeSelector - indicates number of hash table entries (0=0x8000,1=0x800)
  90  * Outputs
  91  * return the calculated entry.
  92  */
  93 u32 hashTableFunction (u32 macH, u32 macL, u32 HashSize, u32 hash_mode)
  94 {
  95         u32 hashResult;
  96         u32 addrH;
  97         u32 addrL;
  98         u32 addr0;
  99         u32 addr1;
 100         u32 addr2;
 101         u32 addr3;
 102         u32 addrHSwapped;
 103         u32 addrLSwapped;
 104
 105
 106         addrH = NIBBLE_SWAPPING_16_BIT (macH);
 107         addrL = NIBBLE_SWAPPING_32_BIT (macL);
 108
 109         addrHSwapped = FLIP_4_BITS (addrH & 0xf)
 110                 + ((FLIP_4_BITS ((addrH >> 4) & 0xf)) << 4)
 111                 + ((FLIP_4_BITS ((addrH >> 8) & 0xf)) << 8)
 112                 + ((FLIP_4_BITS ((addrH >> 12) & 0xf)) << 12);
 113
 114         addrLSwapped = FLIP_4_BITS (addrL & 0xf)
 115                 + ((FLIP_4_BITS ((addrL >> 4) & 0xf)) << 4)
 116                 + ((FLIP_4_BITS ((addrL >> 8) & 0xf)) << 8)
 117                 + ((FLIP_4_BITS ((addrL >> 12) & 0xf)) << 12)
 118                 + ((FLIP_4_BITS ((addrL >> 16) & 0xf)) << 16)
 119                 + ((FLIP_4_BITS ((addrL >> 20) & 0xf)) << 20)
 120                 + ((FLIP_4_BITS ((addrL >> 24) & 0xf)) << 24)
 121                 + ((FLIP_4_BITS ((addrL >> 28) & 0xf)) << 28);
 122
 123         addrH = addrHSwapped;
 124         addrL = addrLSwapped;
 125
 126         if (hash_mode == 0) {
 127                 addr0 = (addrL >> 2) & 0x03f;
 128                 addr1 = (addrL & 0x003) | ((addrL >> 8) & 0x7f) << 2;
 129                 addr2 = (addrL >> 15) & 0x1ff;
 130                 addr3 = ((addrL >> 24) & 0x0ff) | ((addrH & 1) << 8);
 131         } else {
 132                 addr0 = FLIP_6_BITS (addrL & 0x03f);
 133                 addr1 = FLIP_9_BITS (((addrL >> 6) & 0x1ff));
 134                 addr2 = FLIP_9_BITS ((addrL >> 15) & 0x1ff);
 135                 addr3 = FLIP_9_BITS ((((addrL >> 24) & 0x0ff) |
 136                                       ((addrH & 0x1) << 8)));
 137         }
 138
 139         hashResult = (addr0 << 9) | (addr1 ^ addr2 ^ addr3);
 140
 141         if (HashSize == _8K_TABLE) {
 142                 hashResult = hashResult & 0xffff;
 143         } else {
 144                 hashResult = hashResult & 0x07ff;
 145         }
 146
 147         return (hashResult);
 148 }
 149
 150
 151 /*
 152  * ----------------------------------------------------------------------------
 153  * This function will add an entry to the address table.
 154  * depends on the hash mode and hash size that was initialized.
 155  * Inputs
 156  * port - ETHERNET port number.
 157  * macH - the 2 most significant bytes of the MAC address.
 158  * macL - the 4 least significant bytes of the MAC address.
 159  * skip - if 1, skip this address.
 160  * rd   - the RD field in the address table.
 161  * Outputs
 162  * address table entry is added.
 163  * TRUE if success.
 164  * FALSE if table full
 165  */
 166 int addAddressTableEntry (u32 port, u32 macH, u32 macL, u32 rd, u32 skip)
 167 {
 168         addrTblEntry *entry;
 169         u32 newHi;
 170         u32 newLo;
 171         u32 i;
 172
 173         newLo = (((macH >> 4) & 0xf) << 15)
 174                 | (((macH >> 0) & 0xf) << 11)
 175                 | (((macH >> 12) & 0xf) << 7)
 176                 | (((macH >> 8) & 0xf) << 3)
 177                 | (((macL >> 20) & 0x1) << 31)
 178                 | (((macL >> 16) & 0xf) << 27)
 179                 | (((macL >> 28) & 0xf) << 23)
 180                 | (((macL >> 24) & 0xf) << 19)
 181                 | (skip << SKIP_BIT) | (rd << 2) | VALID;
 182
 183         newHi = (((macL >> 4) & 0xf) << 15)
 184                 | (((macL >> 0) & 0xf) << 11)
 185                 | (((macL >> 12) & 0xf) << 7)
 186                 | (((macL >> 8) & 0xf) << 3)
 187                 | (((macL >> 21) & 0x7) << 0);
 188
 189         /*
 190          * Pick the appropriate table, start scanning for free/reusable
 191          * entries at the index obtained by hashing the specified MAC address
 192          */
 193         entry = addressTableBase[port];
 194         entry += hashTableFunction (macH, macL, addressTableHashSize[port],
 195                                     addressTableHashMode[port]);
 196         for (i = 0; i < HOP_NUMBER; i++, entry++) {
 197                 if (!(entry->lo & VALID) /*|| (entry->lo & SKIP) */ ) {
 198                         break;
 199                 } else {        /* if same address put in same position */
 200                         if (((entry->lo & 0xfffffff8) == (newLo & 0xfffffff8))
 201                             && (entry->hi == newHi)) {
 202                                 break;
 203                         }
 204                 }
 205         }
 206
 207         if (i == HOP_NUMBER) {
 208                 PRINTF ("addGT64260addressTableEntry: table section is full\n");
 209                 return (FALSE);
 210         }
 211
 212         /*
 213          * Update the selected entry
 214          */
 215         entry->hi = newHi;
 216         entry->lo = newLo;
 217         DCACHE_FLUSH_N_SYNC ((u32) entry, MAC_ENTRY_SIZE);
 218         return (TRUE);
 219 }
 220
 221 #endif /* CONFIG_GT_USE_MAC_HASH_TABLE */