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mac80211: Move mpath and mpp growth to mesh workqueue. 

This prevents calling rcu_synchronize from within the tx path by moving the
table growth code to the mesh workqueue.

Move mesh_table_free and mesh_table_grow from mesh.c to mesh_pathtbl.c and
declare them static.

Also, re-enable mesh in Kconfig and update the configuration description.

Signed-off-by: Javier Cardona <javier@cozybit.com>
Tested-by: Andrey Yurovsky <andrey@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Javier Cardona 2009-08-10 12:15:52 -07:00 committed by John W. Linville
parent 5b36583425
commit 18889231e4
5 changed files with 144 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/mac80211/Kconfig
View File

@ -66,12 +66,12 @@ endmenu
config MAC80211_MESH
bool "Enable mac80211 mesh networking (pre-802.11s) support"
depends on MAC80211 && EXPERIMENTAL
depends on BROKEN
---help---
This options enables support of Draft 802.11s mesh networking.
The implementation is based on Draft 1.08 of the Mesh Networking
amendment. For more information visit http://o11s.org/.
The implementation is based on Draft 2.08 of the Mesh Networking
amendment. However, no compliance with that draft is claimed or even
possible, as drafts leave a number of identifiers to be defined after
ratification. For more information visit http://o11s.org/.
config MAC80211_LEDS
bool "Enable LED triggers"

2
net/mac80211/ieee80211_i.h
View File

@ -355,7 +355,7 @@ struct ieee80211_if_mesh {
unsigned long timers_running;
bool housekeeping;
unsigned long wrkq_flags;
u8 mesh_id[IEEE80211_MAX_MESH_ID_LEN];
size_t mesh_id_len;

77
net/mac80211/mesh.c
View File

@ -47,7 +47,7 @@ static void ieee80211_mesh_housekeeping_timer(unsigned long data)
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
ifmsh->housekeeping = true;
ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
if (local->quiescing) {
set_bit(TMR_RUNNING_HK, &ifmsh->timers_running);
@ -320,30 +320,6 @@ struct mesh_table *mesh_table_alloc(int size_order)
return newtbl;
}
static void __mesh_table_free(struct mesh_table *tbl)
{
kfree(tbl->hash_buckets);
kfree(tbl->hashwlock);
kfree(tbl);
}
void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
{
struct hlist_head *mesh_hash;
struct hlist_node *p, *q;
int i;
mesh_hash = tbl->hash_buckets;
for (i = 0; i <= tbl->hash_mask; i++) {
spin_lock(&tbl->hashwlock[i]);
hlist_for_each_safe(p, q, &mesh_hash[i]) {
tbl->free_node(p, free_leafs);
atomic_dec(&tbl->entries);
}
spin_unlock(&tbl->hashwlock[i]);
}
__mesh_table_free(tbl);
}
static void ieee80211_mesh_path_timer(unsigned long data)
{
@ -360,44 +336,6 @@ static void ieee80211_mesh_path_timer(unsigned long data)
ieee80211_queue_work(&local->hw, &ifmsh->work);
}
struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
{
struct mesh_table *newtbl;
struct hlist_head *oldhash;
struct hlist_node *p, *q;
int i;
if (atomic_read(&tbl->entries)
< tbl->mean_chain_len * (tbl->hash_mask + 1))
goto endgrow;
newtbl = mesh_table_alloc(tbl->size_order + 1);
if (!newtbl)
goto endgrow;
newtbl->free_node = tbl->free_node;
newtbl->mean_chain_len = tbl->mean_chain_len;
newtbl->copy_node = tbl->copy_node;
atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
oldhash = tbl->hash_buckets;
for (i = 0; i <= tbl->hash_mask; i++)
hlist_for_each(p, &oldhash[i])
if (tbl->copy_node(p, newtbl) < 0)
goto errcopy;
return newtbl;
errcopy:
for (i = 0; i <= newtbl->hash_mask; i++) {
hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
tbl->free_node(p, 0);
}
__mesh_table_free(newtbl);
endgrow:
return NULL;
}
/**
* ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
* @hdr: 802.11 frame header
@ -487,7 +425,6 @@ static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata,
if (free_plinks != sdata->u.mesh.accepting_plinks)
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON);
ifmsh->housekeeping = false;
mod_timer(&ifmsh->housekeeping_timer,
round_jiffies(jiffies + IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
}
@ -524,8 +461,8 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = sdata->local;
ifmsh->housekeeping = true;
queue_work(local->hw, &ifmsh->work);
ifmsh->wrkq_flags |= MESH_WORK_HOUSEKEEPING;
ieee80211_queue_work(&local->hw, &ifmsh->work);
sdata->vif.bss_conf.beacon_int = MESH_DEFAULT_BEACON_INTERVAL;
ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
BSS_CHANGED_BEACON_ENABLED |
@ -664,7 +601,13 @@ static void ieee80211_mesh_work(struct work_struct *work)
ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
mesh_path_start_discovery(sdata);
if (ifmsh->housekeeping)
if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
mesh_mpath_table_grow();
if (test_and_clear_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags))
mesh_mpp_table_grow();
if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
ieee80211_mesh_housekeeping(sdata, ifmsh);
}

20
net/mac80211/mesh.h
View File

@ -43,6 +43,23 @@ enum mesh_path_flags {
MESH_PATH_RESOLVED = BIT(4),
};
/**
* enum mesh_deferred_task_flags - mac80211 mesh deferred tasks
*
*
*
* @MESH_WORK_HOUSEKEEPING: run the periodic mesh housekeeping tasks
* @MESH_WORK_GROW_MPATH_TABLE: the mesh path table is full and needs
* to grow.
* @MESH_WORK_GROW_MPP_TABLE: the mesh portals table is full and needs to
* grow
*/
enum mesh_deferred_task_flags {
MESH_WORK_HOUSEKEEPING,
MESH_WORK_GROW_MPATH_TABLE,
MESH_WORK_GROW_MPP_TABLE,
};
/**
* struct mesh_path - mac80211 mesh path structure
*
@ -250,7 +267,8 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
/* Mesh tables */
struct mesh_table *mesh_table_alloc(int size_order);
void mesh_table_free(struct mesh_table *tbl, bool free_leafs);
struct mesh_table *mesh_table_grow(struct mesh_table *tbl);
void mesh_mpath_table_grow(void);
void mesh_mpp_table_grow(void);
u32 mesh_table_hash(u8 *addr, struct ieee80211_sub_if_data *sdata,
struct mesh_table *tbl);
/* Mesh paths */

146
net/mac80211/mesh_pathtbl.c
View File

@ -39,6 +39,69 @@ static struct mesh_table *mesh_paths;
static struct mesh_table *mpp_paths; /* Store paths for MPP&MAP */
int mesh_paths_generation;
static void __mesh_table_free(struct mesh_table *tbl)
{
kfree(tbl->hash_buckets);
kfree(tbl->hashwlock);
kfree(tbl);
}
void mesh_table_free(struct mesh_table *tbl, bool free_leafs)
{
struct hlist_head *mesh_hash;
struct hlist_node *p, *q;
int i;
mesh_hash = tbl->hash_buckets;
for (i = 0; i <= tbl->hash_mask; i++) {
spin_lock(&tbl->hashwlock[i]);
hlist_for_each_safe(p, q, &mesh_hash[i]) {
tbl->free_node(p, free_leafs);
atomic_dec(&tbl->entries);
}
spin_unlock(&tbl->hashwlock[i]);
}
__mesh_table_free(tbl);
}
static struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
{
struct mesh_table *newtbl;
struct hlist_head *oldhash;
struct hlist_node *p, *q;
int i;
if (atomic_read(&tbl->entries)
< tbl->mean_chain_len * (tbl->hash_mask + 1))
goto endgrow;
newtbl = mesh_table_alloc(tbl->size_order + 1);
if (!newtbl)
goto endgrow;
newtbl->free_node = tbl->free_node;
newtbl->mean_chain_len = tbl->mean_chain_len;
newtbl->copy_node = tbl->copy_node;
atomic_set(&newtbl->entries, atomic_read(&tbl->entries));
oldhash = tbl->hash_buckets;
for (i = 0; i <= tbl->hash_mask; i++)
hlist_for_each(p, &oldhash[i])
if (tbl->copy_node(p, newtbl) < 0)
goto errcopy;
return newtbl;
errcopy:
for (i = 0; i <= newtbl->hash_mask; i++) {
hlist_for_each_safe(p, q, &newtbl->hash_buckets[i])
tbl->free_node(p, 0);
}
__mesh_table_free(newtbl);
endgrow:
return NULL;
}
/* 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
@ -187,6 +250,8 @@ struct mesh_path *mesh_path_lookup_by_idx(int idx, struct ieee80211_sub_if_data
*/
int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = sdata->local;
struct mesh_path *mpath, *new_mpath;
struct mpath_node *node, *new_node;
struct hlist_head *bucket;
@ -195,8 +260,6 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
int err = 0;
u32 hash_idx;
might_sleep();
if (memcmp(dst, sdata->dev->dev_addr, ETH_ALEN) == 0)
/* never add ourselves as neighbours */
return -ENOTSUPP;
@ -208,11 +271,11 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
return -ENOSPC;
err = -ENOMEM;
new_mpath = kzalloc(sizeof(struct mesh_path), GFP_KERNEL);
new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC);
if (!new_mpath)
goto err_path_alloc;
new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL);
new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC);
if (!new_node)
goto err_node_alloc;
@ -250,20 +313,8 @@ int mesh_path_add(u8 *dst, struct ieee80211_sub_if_data *sdata)
spin_unlock(&mesh_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
if (grow) {
struct mesh_table *oldtbl, *newtbl;
write_lock(&pathtbl_resize_lock);
oldtbl = mesh_paths;
newtbl = mesh_table_grow(mesh_paths);
if (!newtbl) {
write_unlock(&pathtbl_resize_lock);
return 0;
}
rcu_assign_pointer(mesh_paths, newtbl);
write_unlock(&pathtbl_resize_lock);
synchronize_rcu();
mesh_table_free(oldtbl, false);
set_bit(MESH_WORK_GROW_MPATH_TABLE, &ifmsh->wrkq_flags);
ieee80211_queue_work(&local->hw, &ifmsh->work);
}
return 0;
@ -278,9 +329,46 @@ err_path_alloc:
return err;
}
void mesh_mpath_table_grow(void)
{
struct mesh_table *oldtbl, *newtbl;
write_lock(&pathtbl_resize_lock);
oldtbl = mesh_paths;
newtbl = mesh_table_grow(mesh_paths);
if (!newtbl) {
write_unlock(&pathtbl_resize_lock);
return;
}
rcu_assign_pointer(mesh_paths, newtbl);
write_unlock(&pathtbl_resize_lock);
synchronize_rcu();
mesh_table_free(oldtbl, false);
}
void mesh_mpp_table_grow(void)
{
struct mesh_table *oldtbl, *newtbl;
write_lock(&pathtbl_resize_lock);
oldtbl = mpp_paths;
newtbl = mesh_table_grow(mpp_paths);
if (!newtbl) {
write_unlock(&pathtbl_resize_lock);
return;
}
rcu_assign_pointer(mpp_paths, newtbl);
write_unlock(&pathtbl_resize_lock);
synchronize_rcu();
mesh_table_free(oldtbl, false);
}
int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
struct ieee80211_local *local = sdata->local;
struct mesh_path *mpath, *new_mpath;
struct mpath_node *node, *new_node;
struct hlist_head *bucket;
@ -289,8 +377,6 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata)
int err = 0;
u32 hash_idx;
might_sleep();
if (memcmp(dst, sdata->dev->dev_addr, ETH_ALEN) == 0)
/* never add ourselves as neighbours */
return -ENOTSUPP;
@ -299,11 +385,11 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata)
return -ENOTSUPP;
err = -ENOMEM;
new_mpath = kzalloc(sizeof(struct mesh_path), GFP_KERNEL);
new_mpath = kzalloc(sizeof(struct mesh_path), GFP_ATOMIC);
if (!new_mpath)
goto err_path_alloc;
new_node = kmalloc(sizeof(struct mpath_node), GFP_KERNEL);
new_node = kmalloc(sizeof(struct mpath_node), GFP_ATOMIC);
if (!new_node)
goto err_node_alloc;
@ -337,20 +423,8 @@ int mpp_path_add(u8 *dst, u8 *mpp, struct ieee80211_sub_if_data *sdata)
spin_unlock(&mpp_paths->hashwlock[hash_idx]);
read_unlock(&pathtbl_resize_lock);
if (grow) {
struct mesh_table *oldtbl, *newtbl;
write_lock(&pathtbl_resize_lock);
oldtbl = mpp_paths;
newtbl = mesh_table_grow(mpp_paths);
if (!newtbl) {
write_unlock(&pathtbl_resize_lock);
return 0;
}
rcu_assign_pointer(mpp_paths, newtbl);
write_unlock(&pathtbl_resize_lock);
synchronize_rcu();
mesh_table_free(oldtbl, false);
set_bit(MESH_WORK_GROW_MPP_TABLE, &ifmsh->wrkq_flags);
ieee80211_queue_work(&local->hw, &ifmsh->work);
}
return 0;