Commit 2bdaf386 authored by Bob Copeland's avatar Bob Copeland Committed by Johannes Berg
Browse files

mac80211: mesh: move path tables into if_mesh 



The mesh path and mesh gate hashtables are global, containing
all of the mpaths for every mesh interface, but the paths are
all tied logically to a single interface.  The common case is
just a single mesh interface, so optimize for that by moving
the global hashtable into the per-interface struct.

Doing so allows us to drop sdata pointer comparisons inside
the lookups and also saves a few bytes of BSS and data.

Signed-off-by: default avatarBob Copeland <me@bobcopeland.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 12880d16

net/mac80211/cfg.c

+2 −2
Original line number Diff line number Diff line
@@ -1499,7 +1499,7 @@ static void mpath_set_pinfo(struct mesh_path *mpath, u8 *next_hop, 


	memset(pinfo, 0, sizeof(*pinfo));



	pinfo->generation = mesh_paths_generation;

	pinfo->generation = mpath->sdata->u.mesh.mesh_paths_generation;



	pinfo->filled = MPATH_INFO_FRAME_QLEN |

			MPATH_INFO_SN |
@@ -1577,7 +1577,7 @@ static void mpp_set_pinfo(struct mesh_path *mpath, u8 *mpp, 
	memset(pinfo, 0, sizeof(*pinfo));

	memcpy(mpp, mpath->mpp, ETH_ALEN);



	pinfo->generation = mpp_paths_generation;

	pinfo->generation = mpath->sdata->u.mesh.mpp_paths_generation;

}



static int ieee80211_get_mpp(struct wiphy *wiphy, struct net_device *dev,

net/mac80211/ieee80211_i.h

+12 −0
Original line number Diff line number Diff line
@@ -696,6 +696,18 @@ struct ieee80211_if_mesh { 


	/* offset from skb->data while building IE */

	int meshconf_offset;



	struct mesh_table __rcu *mesh_paths;

	struct mesh_table __rcu *mpp_paths; /* Store paths for MPP&MAP */

	int mesh_paths_generation;

	int mpp_paths_generation;



	/* Protects assignment of the mesh_paths/mpp_paths table

	 * pointer for resize against reading it for add/delete

	 * of individual paths.  Pure readers (lookups) just use

	 * RCU.

	 */

	rwlock_t pathtbl_resize_lock;

};



#ifdef CONFIG_MAC80211_MESH

net/mac80211/mesh.c

+6 −4
Original line number Diff line number Diff line
@@ -25,7 +25,6 @@ bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt) 


void ieee80211s_init(void)

{

	mesh_pathtbl_init();

	mesh_allocated = 1;

	rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),

				     0, 0, NULL);
@@ -35,7 +34,6 @@ void ieee80211s_stop(void) 
{

	if (!mesh_allocated)

		return;

	mesh_pathtbl_unregister();

	kmem_cache_destroy(rm_cache);

}
@@ -902,6 +900,7 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata) 
	/* flush STAs and mpaths on this iface */

	sta_info_flush(sdata);

	mesh_path_flush_by_iface(sdata);

	mesh_pathtbl_unregister(sdata);



	/* free all potentially still buffered group-addressed frames */

	local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
@@ -1349,10 +1348,10 @@ void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata) 
		mesh_path_start_discovery(sdata);



	if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))

		mesh_mpath_table_grow();

		mesh_mpath_table_grow(sdata);



	if (test_and_clear_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags))

		mesh_mpp_table_grow();

		mesh_mpp_table_grow(sdata);



	if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))

		ieee80211_mesh_housekeeping(sdata);
@@ -1388,6 +1387,9 @@ void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata) 
	/* Allocate all mesh structures when creating the first mesh interface. */

	if (!mesh_allocated)

		ieee80211s_init();



	mesh_pathtbl_init(sdata);



	setup_timer(&ifmsh->mesh_path_timer,

		    ieee80211_mesh_path_timer,

		    (unsigned long) sdata);

net/mac80211/mesh.h

+4 −6
Original line number Diff line number Diff line
@@ -300,8 +300,8 @@ void mesh_sta_cleanup(struct sta_info *sta); 


/* Private interfaces */

/* Mesh tables */

void mesh_mpath_table_grow(void);

void mesh_mpp_table_grow(void);

void mesh_mpath_table_grow(struct ieee80211_sub_if_data *sdata);

void mesh_mpp_table_grow(struct ieee80211_sub_if_data *sdata);

/* Mesh paths */

int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata,

		       u8 ttl, const u8 *target, u32 target_sn,
@@ -309,8 +309,8 @@ int mesh_path_error_tx(struct ieee80211_sub_if_data *sdata, 
void mesh_path_assign_nexthop(struct mesh_path *mpath, struct sta_info *sta);

void mesh_path_flush_pending(struct mesh_path *mpath);

void mesh_path_tx_pending(struct mesh_path *mpath);

int mesh_pathtbl_init(void);

void mesh_pathtbl_unregister(void);

int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata);

void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata);

int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr);

void mesh_path_timer(unsigned long data);

void mesh_path_flush_by_nexthop(struct sta_info *sta);
@@ -319,8 +319,6 @@ void mesh_path_discard_frame(struct ieee80211_sub_if_data *sdata, 
void mesh_path_tx_root_frame(struct ieee80211_sub_if_data *sdata);



bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt);

extern int mesh_paths_generation;

extern int mpp_paths_generation;



#ifdef CONFIG_MAC80211_MESH

static inline

net/mac80211/mesh_pathtbl.c

+79 −102
Original line number Diff line number Diff line
@@ -40,36 +40,24 @@ struct mpath_node { 
	struct mesh_path *mpath;

};



static struct mesh_table __rcu *mesh_paths;

static struct mesh_table __rcu *mpp_paths; /* Store paths for MPP&MAP */



int mesh_paths_generation;

int mpp_paths_generation;



/* This lock will have the grow table function as writer and add / delete nodes

 * as readers. RCU provides sufficient protection only when reading the table

 * (i.e. doing lookups).  Adding or adding or removing nodes requires we take

 * the read lock or we risk operating on an old table.  The write lock is only

 * needed when modifying the number of buckets a table.

 */

static DEFINE_RWLOCK(pathtbl_resize_lock);





static inline struct mesh_table *resize_dereference_paths(

	struct ieee80211_sub_if_data *sdata,

	struct mesh_table __rcu *table)

{

	return rcu_dereference_protected(table,

					lockdep_is_held(&pathtbl_resize_lock));

		lockdep_is_held(&sdata->u.mesh.pathtbl_resize_lock));

}



static inline struct mesh_table *resize_dereference_mesh_paths(void)

static inline struct mesh_table *resize_dereference_mesh_paths(

		struct ieee80211_sub_if_data *sdata)

{

	return resize_dereference_paths(mesh_paths);

	return resize_dereference_paths(sdata, sdata->u.mesh.mesh_paths);

}



static inline struct mesh_table *resize_dereference_mpp_paths(void)

static inline struct mesh_table *resize_dereference_mpp_paths(

		struct ieee80211_sub_if_data *sdata)

{

	return resize_dereference_paths(mpp_paths);

	return resize_dereference_paths(sdata, sdata->u.mesh.mpp_paths);

}



/*
@@ -346,8 +334,7 @@ static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, 
	bucket = &tbl->hash_buckets[mesh_table_hash(dst, sdata, tbl)];

	hlist_for_each_entry_rcu(node, bucket, list) {

		mpath = node->mpath;

		if (mpath->sdata == sdata &&

		    ether_addr_equal(dst, mpath->dst)) {

		if (ether_addr_equal(dst, mpath->dst)) {

			if (mpath_expired(mpath)) {

				spin_lock_bh(&mpath->state_lock);

				mpath->flags &= ~MESH_PATH_ACTIVE;
@@ -371,13 +358,15 @@ static struct mesh_path *mpath_lookup(struct mesh_table *tbl, const u8 *dst, 
struct mesh_path *

mesh_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)

{

	return mpath_lookup(rcu_dereference(mesh_paths), dst, sdata);

	return mpath_lookup(rcu_dereference(sdata->u.mesh.mesh_paths), dst,

			    sdata);

}



struct mesh_path *

mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst)

{

	return mpath_lookup(rcu_dereference(mpp_paths), dst, sdata);

	return mpath_lookup(rcu_dereference(sdata->u.mesh.mpp_paths), dst,

			    sdata);

}
@@ -393,14 +382,12 @@ mpp_path_lookup(struct ieee80211_sub_if_data *sdata, const u8 *dst) 
struct mesh_path *

mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)

{

	struct mesh_table *tbl = rcu_dereference(mesh_paths);

	struct mesh_table *tbl = rcu_dereference(sdata->u.mesh.mesh_paths);

	struct mpath_node *node;

	int i;

	int j = 0;



	for_each_mesh_entry(tbl, node, i) {

		if (sdata && node->mpath->sdata != sdata)

			continue;

		if (j++ == idx) {

			if (mpath_expired(node->mpath)) {

				spin_lock_bh(&node->mpath->state_lock);
@@ -426,14 +413,12 @@ mesh_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx) 
struct mesh_path *

mpp_path_lookup_by_idx(struct ieee80211_sub_if_data *sdata, int idx)

{

	struct mesh_table *tbl = rcu_dereference(mpp_paths);

	struct mesh_table *tbl = rcu_dereference(sdata->u.mesh.mpp_paths);

	struct mpath_node *node;

	int i;

	int j = 0;



	for_each_mesh_entry(tbl, node, i) {

		if (sdata && node->mpath->sdata != sdata)

			continue;

		if (j++ == idx)

			return node->mpath;

	}
@@ -452,7 +437,7 @@ int mesh_path_add_gate(struct mesh_path *mpath) 
	int err;



	rcu_read_lock();

	tbl = rcu_dereference(mesh_paths);

	tbl = rcu_dereference(mpath->sdata->u.mesh.mesh_paths);



	hlist_for_each_entry_rcu(gate, tbl->known_gates, list)

		if (gate->mpath == mpath) {
@@ -550,8 +535,8 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 
	if (atomic_add_unless(&sdata->u.mesh.mpaths, 1, MESH_MAX_MPATHS) == 0)

		return ERR_PTR(-ENOSPC);



	read_lock_bh(&pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths();

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths(sdata);



	hash_idx = mesh_table_hash(dst, sdata, tbl);

	bucket = &tbl->hash_buckets[hash_idx];
@@ -560,8 +545,7 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 


	hlist_for_each_entry(node, bucket, list) {

		mpath = node->mpath;

		if (mpath->sdata == sdata &&

		    ether_addr_equal(dst, mpath->dst))

		if (ether_addr_equal(dst, mpath->dst))

			goto found;

	}
@@ -592,7 +576,7 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 
	    MEAN_CHAIN_LEN * (tbl->hash_mask + 1))

		grow = 1;



	mesh_paths_generation++;

	sdata->u.mesh.mesh_paths_generation++;



	if (grow) {

		set_bit(MESH_WORK_GROW_MPATH_TABLE,  &ifmsh->wrkq_flags);
@@ -601,7 +585,7 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 
	mpath = new_mpath;

found:

	spin_unlock(&tbl->hashwlock[hash_idx]);

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	return mpath;



err_node_alloc:
@@ -609,7 +593,7 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata, 
err_path_alloc:

	atomic_dec(&sdata->u.mesh.mpaths);

	spin_unlock(&tbl->hashwlock[hash_idx]);

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	return ERR_PTR(err);

}
@@ -620,12 +604,12 @@ static void mesh_table_free_rcu(struct rcu_head *rcu) 
	mesh_table_free(tbl, false);

}



void mesh_mpath_table_grow(void)

void mesh_mpath_table_grow(struct ieee80211_sub_if_data *sdata)

{

	struct mesh_table *oldtbl, *newtbl;



	write_lock_bh(&pathtbl_resize_lock);

	oldtbl = resize_dereference_mesh_paths();

	write_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	oldtbl = resize_dereference_mesh_paths(sdata);

	newtbl = mesh_table_alloc(oldtbl->size_order + 1);

	if (!newtbl)

		goto out;
@@ -633,20 +617,20 @@ void mesh_mpath_table_grow(void) 
		__mesh_table_free(newtbl);

		goto out;

	}

	rcu_assign_pointer(mesh_paths, newtbl);

	rcu_assign_pointer(sdata->u.mesh.mesh_paths, newtbl);



	call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu);



 out:

	write_unlock_bh(&pathtbl_resize_lock);

	write_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

}



void mesh_mpp_table_grow(void)

void mesh_mpp_table_grow(struct ieee80211_sub_if_data *sdata)

{

	struct mesh_table *oldtbl, *newtbl;



	write_lock_bh(&pathtbl_resize_lock);

	oldtbl = resize_dereference_mpp_paths();

	write_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	oldtbl = resize_dereference_mpp_paths(sdata);

	newtbl = mesh_table_alloc(oldtbl->size_order + 1);

	if (!newtbl)

		goto out;
@@ -654,11 +638,11 @@ void mesh_mpp_table_grow(void) 
		__mesh_table_free(newtbl);

		goto out;

	}

	rcu_assign_pointer(mpp_paths, newtbl);

	rcu_assign_pointer(sdata->u.mesh.mpp_paths, newtbl);

	call_rcu(&oldtbl->rcu_head, mesh_table_free_rcu);



 out:

	write_unlock_bh(&pathtbl_resize_lock);

	write_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

}



int mpp_path_add(struct ieee80211_sub_if_data *sdata,
@@ -690,7 +674,7 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata, 
	if (!new_node)

		goto err_node_alloc;



	read_lock_bh(&pathtbl_resize_lock);

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	memcpy(new_mpath->dst, dst, ETH_ALEN);

	memcpy(new_mpath->mpp, mpp, ETH_ALEN);

	new_mpath->sdata = sdata;
@@ -701,7 +685,7 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata, 
	new_mpath->exp_time = jiffies;

	spin_lock_init(&new_mpath->state_lock);



	tbl = resize_dereference_mpp_paths();

	tbl = resize_dereference_mpp_paths(sdata);



	hash_idx = mesh_table_hash(dst, sdata, tbl);

	bucket = &tbl->hash_buckets[hash_idx];
@@ -711,8 +695,7 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata, 
	err = -EEXIST;

	hlist_for_each_entry(node, bucket, list) {

		mpath = node->mpath;

		if (mpath->sdata == sdata &&

		    ether_addr_equal(dst, mpath->dst))

		if (ether_addr_equal(dst, mpath->dst))

			goto err_exists;

	}
@@ -722,9 +705,9 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata, 
		grow = 1;



	spin_unlock(&tbl->hashwlock[hash_idx]);

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);



	mpp_paths_generation++;

	sdata->u.mesh.mpp_paths_generation++;



	if (grow) {

		set_bit(MESH_WORK_GROW_MPP_TABLE,  &ifmsh->wrkq_flags);
@@ -734,7 +717,7 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata, 


err_exists:

	spin_unlock(&tbl->hashwlock[hash_idx]);

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	kfree(new_node);

err_node_alloc:

	kfree(new_mpath);
@@ -761,7 +744,7 @@ void mesh_plink_broken(struct sta_info *sta) 
	int i;



	rcu_read_lock();

	tbl = rcu_dereference(mesh_paths);

	tbl = rcu_dereference(sdata->u.mesh.mesh_paths);

	for_each_mesh_entry(tbl, node, i) {

		mpath = node->mpath;

		if (rcu_access_pointer(mpath->next_hop) == sta &&
@@ -819,14 +802,15 @@ static void __mesh_path_del(struct mesh_table *tbl, struct mpath_node *node) 
 */

void mesh_path_flush_by_nexthop(struct sta_info *sta)

{

	struct ieee80211_sub_if_data *sdata = sta->sdata;

	struct mesh_table *tbl;

	struct mesh_path *mpath;

	struct mpath_node *node;

	int i;



	rcu_read_lock();

	read_lock_bh(&pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths();

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths(sdata);

	for_each_mesh_entry(tbl, node, i) {

		mpath = node->mpath;

		if (rcu_access_pointer(mpath->next_hop) == sta) {
@@ -835,7 +819,7 @@ void mesh_path_flush_by_nexthop(struct sta_info *sta) 
			spin_unlock(&tbl->hashwlock[i]);

		}

	}

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	rcu_read_unlock();

}
@@ -848,8 +832,8 @@ static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, 
	int i;



	rcu_read_lock();

	read_lock_bh(&pathtbl_resize_lock);

	tbl = resize_dereference_mpp_paths();

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	tbl = resize_dereference_mpp_paths(sdata);

	for_each_mesh_entry(tbl, node, i) {

		mpp = node->mpath;

		if (ether_addr_equal(mpp->mpp, proxy)) {
@@ -858,7 +842,7 @@ static void mpp_flush_by_proxy(struct ieee80211_sub_if_data *sdata, 
			spin_unlock(&tbl->hashwlock[i]);

		}

	}

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	rcu_read_unlock();

}
@@ -872,8 +856,6 @@ static void table_flush_by_iface(struct mesh_table *tbl, 
	WARN_ON(!rcu_read_lock_held());

	for_each_mesh_entry(tbl, node, i) {

		mpath = node->mpath;

		if (mpath->sdata != sdata)

			continue;

		spin_lock_bh(&tbl->hashwlock[i]);

		__mesh_path_del(tbl, node);

		spin_unlock_bh(&tbl->hashwlock[i]);
@@ -893,12 +875,12 @@ void mesh_path_flush_by_iface(struct ieee80211_sub_if_data *sdata) 
	struct mesh_table *tbl;



	rcu_read_lock();

	read_lock_bh(&pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths();

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	tbl = resize_dereference_mesh_paths(sdata);

	table_flush_by_iface(tbl, sdata);

	tbl = resize_dereference_mpp_paths();

	tbl = resize_dereference_mpp_paths(sdata);

	table_flush_by_iface(tbl, sdata);

	read_unlock_bh(&pathtbl_resize_lock);

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	rcu_read_unlock();

}
@@ -922,15 +904,14 @@ static int table_path_del(struct mesh_table __rcu *rcu_tbl, 
	int hash_idx;

	int err = 0;



	tbl = resize_dereference_paths(rcu_tbl);

	tbl = resize_dereference_paths(sdata, rcu_tbl);

	hash_idx = mesh_table_hash(addr, sdata, tbl);

	bucket = &tbl->hash_buckets[hash_idx];



	spin_lock(&tbl->hashwlock[hash_idx]);

	hlist_for_each_entry(node, bucket, list) {

		mpath = node->mpath;

		if (mpath->sdata == sdata &&

		    ether_addr_equal(addr, mpath->dst)) {

		if (ether_addr_equal(addr, mpath->dst)) {

			__mesh_path_del(tbl, node);

			goto enddel;

		}
@@ -957,10 +938,10 @@ int mesh_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) 
	/* flush relevant mpp entries first */

	mpp_flush_by_proxy(sdata, addr);



	read_lock_bh(&pathtbl_resize_lock);

	err = table_path_del(mesh_paths, sdata, addr);

	mesh_paths_generation++;

	read_unlock_bh(&pathtbl_resize_lock);

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	err = table_path_del(sdata->u.mesh.mesh_paths, sdata, addr);

	sdata->u.mesh.mesh_paths_generation++;

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);



	return err;

}
@@ -977,10 +958,10 @@ static int mpp_path_del(struct ieee80211_sub_if_data *sdata, const u8 *addr) 
{

	int err = 0;



	read_lock_bh(&pathtbl_resize_lock);

	err = table_path_del(mpp_paths, sdata, addr);

	mpp_paths_generation++;

	read_unlock_bh(&pathtbl_resize_lock);

	read_lock_bh(&sdata->u.mesh.pathtbl_resize_lock);

	err = table_path_del(sdata->u.mesh.mpp_paths, sdata, addr);

	sdata->u.mesh.mpp_paths_generation++;

	read_unlock_bh(&sdata->u.mesh.pathtbl_resize_lock);



	return err;

}
@@ -1020,7 +1001,7 @@ int mesh_path_send_to_gates(struct mesh_path *mpath) 
	struct hlist_head *known_gates;



	rcu_read_lock();

	tbl = rcu_dereference(mesh_paths);

	tbl = rcu_dereference(sdata->u.mesh.mesh_paths);

	known_gates = tbl->known_gates;

	rcu_read_unlock();
@@ -1028,9 +1009,6 @@ int mesh_path_send_to_gates(struct mesh_path *mpath) 
		return -EHOSTUNREACH;



	hlist_for_each_entry_rcu(gate, known_gates, list) {

		if (gate->mpath->sdata != sdata)

			continue;



		if (gate->mpath->flags & MESH_PATH_ACTIVE) {

			mpath_dbg(sdata, "Forwarding to %pM\n", gate->mpath->dst);

			mesh_path_move_to_queue(gate->mpath, from_mpath, copy);
@@ -1043,8 +1021,7 @@ int mesh_path_send_to_gates(struct mesh_path *mpath) 
		}

	}



	hlist_for_each_entry_rcu(gate, known_gates, list)

		if (gate->mpath->sdata == sdata) {

	hlist_for_each_entry_rcu(gate, known_gates, list) {

		mpath_dbg(sdata, "Sending to %pM\n", gate->mpath->dst);

		mesh_path_tx_pending(gate->mpath);

	}
@@ -1136,7 +1113,7 @@ static int mesh_path_node_copy(struct hlist_node *p, struct mesh_table *newtbl) 
	return 0;

}



int mesh_pathtbl_init(void)

int mesh_pathtbl_init(struct ieee80211_sub_if_data *sdata)

{

	struct mesh_table *tbl_path, *tbl_mpp;

	int ret;
@@ -1168,9 +1145,11 @@ int mesh_pathtbl_init(void) 
	}

	INIT_HLIST_HEAD(tbl_mpp->known_gates);



	rwlock_init(&sdata->u.mesh.pathtbl_resize_lock);



	/* Need no locking since this is during init */

	RCU_INIT_POINTER(mesh_paths, tbl_path);

	RCU_INIT_POINTER(mpp_paths, tbl_mpp);

	RCU_INIT_POINTER(sdata->u.mesh.mesh_paths, tbl_path);

	RCU_INIT_POINTER(sdata->u.mesh.mpp_paths, tbl_mpp);



	return 0;
@@ -1189,33 +1168,31 @@ void mesh_path_expire(struct ieee80211_sub_if_data *sdata) 
	int i;



	rcu_read_lock();

	tbl = rcu_dereference(mesh_paths);

	tbl = rcu_dereference(sdata->u.mesh.mesh_paths);

	for_each_mesh_entry(tbl, node, i) {

		if (node->mpath->sdata != sdata)

			continue;

		mpath = node->mpath;

		if ((!(mpath->flags & MESH_PATH_RESOLVING)) &&

		    (!(mpath->flags & MESH_PATH_FIXED)) &&

		     time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))

			mesh_path_del(mpath->sdata, mpath->dst);

			mesh_path_del(sdata, mpath->dst);

	}



	tbl = rcu_dereference(mpp_paths);

	tbl = rcu_dereference(sdata->u.mesh.mpp_paths);

	for_each_mesh_entry(tbl, node, i) {

		if (node->mpath->sdata != sdata)

			continue;

		mpath = node->mpath;

		if ((!(mpath->flags & MESH_PATH_FIXED)) &&

		    time_after(jiffies, mpath->exp_time + MESH_PATH_EXPIRE))

			mpp_path_del(mpath->sdata, mpath->dst);

			mpp_path_del(sdata, mpath->dst);

	}



	rcu_read_unlock();

}



void mesh_pathtbl_unregister(void)

void mesh_pathtbl_unregister(struct ieee80211_sub_if_data *sdata)

{

	/* no need for locking during exit path */

	mesh_table_free(rcu_dereference_protected(mesh_paths, 1), true);

	mesh_table_free(rcu_dereference_protected(mpp_paths, 1), true);

	mesh_table_free(rcu_dereference_protected(sdata->u.mesh.mesh_paths, 1),

			true);

	mesh_table_free(rcu_dereference_protected(sdata->u.mesh.mpp_paths, 1),

			true);

}