diff options
Diffstat (limited to 'src/vnet/l2/l2_bd.c')
| -rw-r--r-- | src/vnet/l2/l2_bd.c | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/src/vnet/l2/l2_bd.c b/src/vnet/l2/l2_bd.c index a8429170788..9c81b0f81a0 100644 --- a/src/vnet/l2/l2_bd.c +++ b/src/vnet/l2/l2_bd.c @@ -1608,28 +1608,25 @@ VLIB_CLI_COMMAND (bd_create_cli, static) = { * Returns an unused bridge domain id, and ~0 if it can't find one. */ u32 -bd_get_unused_id () +bd_get_unused_id (void) { bd_main_t *bdm = &bd_main; int i, j; - int is_seed_low = 0; static u32 seed = 0; + /* limit to 1M tries */ for (j = 0; j < 1 << 10; j++) { - seed = random_u32 (&seed) & L2_BD_ID_MAX; - if (seed == 0) - continue; - if (seed < L2_BD_ID_MAX % 2) - is_seed_low = 1; - for (i = 0; i < L2_BD_ID_MAX % 2; i++) + seed = random_u32 (&seed); + for (i = 0; i < 1 << 10; i++) { - /* look around randomly generated id */ - if (is_seed_low) - seed += (2 * (i % 2) - 1) * i; - else - seed -= (2 * (i % 2) - 1) * i; - if (seed == ~0 || seed == 0) + /* + * iterate seed+0, seed+1, seed-1, seed+2, seed-2, ... to generate id + */ + seed += (2 * (i % 2) - 1) * i; + /* bd_id must be (1 <= bd_id <= L2_BD_ID_MAX) */ + seed &= L2_BD_ID_MAX; + if (seed == 0) continue; if (bd_find_index (bdm, seed) == ~0) return seed; |