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mac80211: mesh: embed gates hlist head directly 

Since we have converted the mesh path tables to rhashtable, we are
no longer swapping out the entire mesh_pathtbl pointer with RCU.
As a result, we no longer need indirection to the hlist head for
the gates list and can simply embed it, saving a pair of
pointer-sized allocations.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Bob Copeland 2016-03-18 22:11:30 -04:00 committed by Johannes Berg
parent 47a0489ce1
commit 18b27ff7d2
2 changed files with 5 additions and 15 deletions
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2
net/mac80211/mesh.h
View File

@ -134,7 +134,7 @@ struct mesh_path {
*/
struct mesh_table {
atomic_t entries; /* Up to MAX_MESH_NEIGHBOURS */
struct hlist_head *known_gates;
struct hlist_head known_gates;
spinlock_t gates_lock;
struct rhashtable rhead;

18
net/mac80211/mesh_pathtbl.c
View File

@ -58,12 +58,7 @@ static struct mesh_table *mesh_table_alloc(void)
if (!newtbl)
return NULL;
newtbl->known_gates = kzalloc(sizeof(struct hlist_head), GFP_ATOMIC);
if (!newtbl->known_gates) {
kfree(newtbl);
return NULL;
}
INIT_HLIST_HEAD(newtbl->known_gates);
INIT_HLIST_HEAD(&newtbl->known_gates);
atomic_set(&newtbl->entries, 0);
spin_lock_init(&newtbl->gates_lock);
@ -341,7 +336,7 @@ int mesh_path_add_gate(struct mesh_path *mpath)
mpath->sdata->u.mesh.num_gates++;
spin_lock(&tbl->gates_lock);
hlist_add_head_rcu(&mpath->gate_list, tbl->known_gates);
hlist_add_head_rcu(&mpath->gate_list, &tbl->known_gates);
spin_unlock(&tbl->gates_lock);
spin_unlock_bh(&mpath->state_lock);
@ -759,16 +754,11 @@ int mesh_path_send_to_gates(struct mesh_path *mpath)
struct mesh_path *from_mpath = mpath;
struct mesh_path *gate;
bool copy = false;
struct hlist_head *known_gates;
tbl = sdata->u.mesh.mesh_paths;
known_gates = tbl->known_gates;
if (!known_gates)
return -EHOSTUNREACH;
rcu_read_lock();
hlist_for_each_entry_rcu(gate, known_gates, gate_list) {
hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
if (gate->flags & MESH_PATH_ACTIVE) {
mpath_dbg(sdata, "Forwarding to %pM\n", gate->dst);
mesh_path_move_to_queue(gate, from_mpath, copy);
@ -781,7 +771,7 @@ int mesh_path_send_to_gates(struct mesh_path *mpath)
}
}
hlist_for_each_entry_rcu(gate, known_gates, gate_list) {
hlist_for_each_entry_rcu(gate, &tbl->known_gates, gate_list) {
mpath_dbg(sdata, "Sending to %pM\n", gate->dst);
mesh_path_tx_pending(gate);
}