diff options
Diffstat (limited to 'net/mac80211/mesh_pathtbl.c')
| -rw-r--r-- | net/mac80211/mesh_pathtbl.c | 60 |
1 files changed, 53 insertions, 7 deletions
diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c index c7cb3cc083df..0aa96cd6bd27 100644 --- a/net/mac80211/mesh_pathtbl.c +++ b/net/mac80211/mesh_pathtbl.c @@ -40,6 +40,50 @@ static struct mesh_table *mesh_paths; static struct mesh_table *mpp_paths; /* Store paths for MPP&MAP */ int mesh_paths_generation; + +/* This lock will have the grow table function as writer and add / delete nodes + * as readers. When reading the table (i.e. doing lookups) we are well protected + * by RCU + */ +static DEFINE_RWLOCK(pathtbl_resize_lock); + + +static struct mesh_table *mesh_table_alloc(int size_order) +{ + int i; + struct mesh_table *newtbl; + + newtbl = kmalloc(sizeof(struct mesh_table), GFP_KERNEL); + if (!newtbl) + return NULL; + + newtbl->hash_buckets = kzalloc(sizeof(struct hlist_head) * + (1 << size_order), GFP_KERNEL); + + if (!newtbl->hash_buckets) { + kfree(newtbl); + return NULL; + } + + newtbl->hashwlock = kmalloc(sizeof(spinlock_t) * + (1 << size_order), GFP_KERNEL); + if (!newtbl->hashwlock) { + kfree(newtbl->hash_buckets); + kfree(newtbl); + return NULL; + } + + newtbl->size_order = size_order; + newtbl->hash_mask = (1 << size_order) - 1; + atomic_set(&newtbl->entries, 0); + get_random_bytes(&newtbl->hash_rnd, + sizeof(newtbl->hash_rnd)); + for (i = 0; i <= newtbl->hash_mask; i++) + spin_lock_init(&newtbl->hashwlock[i]); + + return newtbl; +} + static void __mesh_table_free(struct mesh_table *tbl) { kfree(tbl->hash_buckets); @@ -47,7 +91,7 @@ static void __mesh_table_free(struct mesh_table *tbl) kfree(tbl); } -void mesh_table_free(struct mesh_table *tbl, bool free_leafs) +static void mesh_table_free(struct mesh_table *tbl, bool free_leafs) { struct hlist_head *mesh_hash; struct hlist_node *p, *q; @@ -66,7 +110,7 @@ void mesh_table_free(struct mesh_table *tbl, bool free_leafs) } static int mesh_table_grow(struct mesh_table *oldtbl, - struct mesh_table *newtbl) + struct mesh_table *newtbl) { struct hlist_head *oldhash; struct hlist_node *p, *q; @@ -97,12 +141,14 @@ errcopy: return -ENOMEM; } +static u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata, + struct mesh_table *tbl) +{ + /* Use last four bytes of hw addr and interface index as hash index */ + return jhash_2words(*(u32 *)(addr+2), sdata->dev->ifindex, tbl->hash_rnd) + & tbl->hash_mask; +} -/* This lock will have the grow table function as writer and add / delete nodes - * as readers. When reading the table (i.e. doing lookups) we are well protected - * by RCU - */ -static DEFINE_RWLOCK(pathtbl_resize_lock); /** * |