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mac80211: add sta_state callback

Browse Source 
(based on Eliad's patch)

Add a callback to notify the low-level driver whenever
the state of a station changes. The driver is only
notified when the station is actually in the mac80211
hash table, not for pre-insert state transitions.

To allow the driver to replace sta_add/remove calls
with this, call extra transitions with the NOTEXIST
state.

This callback can fail, so we need to be careful in
handling it when a station is inserted, particularly
in the IBSS case where we still keep the station entry
around for mac80211 purposes.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2012-01-20 13:55:21 +01:00 committed by John W. Linville
parent 71ec375c75
commit f09603a259
8 changed files with 202 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
include/net/mac80211.h
View File

@ -981,6 +981,25 @@ enum set_key_cmd {
SET_KEY, DISABLE_KEY,
};
/**
* enum ieee80211_sta_state - station state
*
* @IEEE80211_STA_NOTEXIST: station doesn't exist at all,
* this is a special state for add/remove transitions
* @IEEE80211_STA_NONE: station exists without special state
* @IEEE80211_STA_AUTH: station is authenticated
* @IEEE80211_STA_ASSOC: station is associated
* @IEEE80211_STA_AUTHORIZED: station is authorized (802.1X)
*/
enum ieee80211_sta_state {
/* NOTE: These need to be ordered correctly! */
IEEE80211_STA_NOTEXIST,
IEEE80211_STA_NONE,
IEEE80211_STA_AUTH,
IEEE80211_STA_ASSOC,
IEEE80211_STA_AUTHORIZED,
};
/**
* struct ieee80211_sta - station table entry
*
@ -1974,6 +1993,13 @@ enum ieee80211_frame_release_type {
* in AP mode, this callback will not be called when the flag
* %IEEE80211_HW_AP_LINK_PS is set. Must be atomic.
*
* @sta_state: Notifies low level driver about state transition of a
* station (which can be the AP, a client, IBSS/WDS/mesh peer etc.)
* This callback is mutually exclusive with @sta_add/@sta_remove.
* It must not fail for down transitions but may fail for transitions
* up the list of states.
* The callback can sleep.
*
* @conf_tx: Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
* bursting) for a hardware TX queue.
* Returns a negative error code on failure.
@ -2193,6 +2219,10 @@ struct ieee80211_ops {
struct ieee80211_sta *sta);
void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
enum sta_notify_cmd, struct ieee80211_sta *sta);
int (*sta_state)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct ieee80211_sta *sta,
enum ieee80211_sta_state old_state,
enum ieee80211_sta_state new_state);
int (*conf_tx)(struct ieee80211_hw *hw,
struct ieee80211_vif *vif, u16 queue,
const struct ieee80211_tx_queue_params *params);

22
net/mac80211/driver-ops.h
View File

@ -478,6 +478,28 @@ static inline void drv_sta_remove(struct ieee80211_local *local,
trace_drv_return_void(local);
}
static inline __must_check
int drv_sta_state(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
enum ieee80211_sta_state old_state,
enum ieee80211_sta_state new_state)
{
int ret = 0;
might_sleep();
sdata = get_bss_sdata(sdata);
check_sdata_in_driver(sdata);
trace_drv_sta_state(local, sdata, &sta->sta, old_state, new_state);
if (local->ops->sta_state)
ret = local->ops->sta_state(&local->hw, &sdata->vif, &sta->sta,
old_state, new_state);
trace_drv_return_int(local, ret);
return ret;
}
static inline int drv_conf_tx(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata, u16 queue,
const struct ieee80211_tx_queue_params *params)

32
net/mac80211/driver-trace.h
View File

@ -635,6 +635,38 @@ TRACE_EVENT(drv_sta_notify,
)
);
TRACE_EVENT(drv_sta_state,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *sta,
enum ieee80211_sta_state old_state,
enum ieee80211_sta_state new_state),
TP_ARGS(local, sdata, sta, old_state, new_state),
TP_STRUCT__entry(
LOCAL_ENTRY
VIF_ENTRY
STA_ENTRY
__field(u32, old_state)
__field(u32, new_state)
),
TP_fast_assign(
LOCAL_ASSIGN;
VIF_ASSIGN;
STA_ASSIGN;
__entry->old_state = old_state;
__entry->new_state = new_state;
),
TP_printk(
LOCAL_PR_FMT VIF_PR_FMT STA_PR_FMT " state: %d->%d",
LOCAL_PR_ARG, VIF_PR_ARG, STA_PR_ARG,
__entry->old_state, __entry->new_state
)
);
TRACE_EVENT(drv_sta_add,
TP_PROTO(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,

3
net/mac80211/main.c
View File

@ -535,6 +535,9 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
int priv_size, i;
struct wiphy *wiphy;
if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
return NULL;
/* Ensure 32-byte alignment of our private data and hw private data.
* We use the wiphy priv data for both our ieee80211_local and for
* the driver's private data

10
net/mac80211/pm.c
View File

@ -97,9 +97,17 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
/* tear down aggregation sessions and remove STAs */
mutex_lock(&local->sta_mtx);
list_for_each_entry(sta, &local->sta_list, list) {
if (sta->uploaded)
if (sta->uploaded) {
enum ieee80211_sta_state state;
drv_sta_remove(local, sta->sdata, &sta->sta);
state = sta->sta_state;
for (; state > IEEE80211_STA_NOTEXIST; state--)
WARN_ON(drv_sta_state(local, sdata, sta,
state, state - 1));
}
mesh_plink_quiesce(sta);
}
mutex_unlock(&local->sta_mtx);

122
net/mac80211/sta_info.c
View File

@ -351,6 +351,38 @@ static int sta_info_insert_check(struct sta_info *sta)
return 0;
}
static int sta_info_insert_drv_state(struct ieee80211_local *local,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta)
{
enum ieee80211_sta_state state;
int err = 0;
for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
err = drv_sta_state(local, sdata, sta, state, state + 1);
if (err)
break;
}
if (!err) {
sta->uploaded = true;
return 0;
}
if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
printk(KERN_DEBUG
"%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway.\n",
sdata->name, sta->sta.addr, state + 1, err);
err = 0;
}
/* unwind on error */
for (; state > IEEE80211_STA_NOTEXIST; state--)
WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
return err;
}
/*
* should be called with sta_mtx locked
* this function replaces the mutex lock
@ -392,8 +424,11 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to "
"driver (%d) - keeping it anyway.\n",
sdata->name, sta->sta.addr, err);
} else
sta->uploaded = true;
} else {
err = sta_info_insert_drv_state(local, sdata, sta);
if (err)
goto out_err;
}
}
if (!dummy_reinsert) {
@ -759,15 +794,19 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
while (sta->sta_state > IEEE80211_STA_NONE) {
int err = sta_info_move_state(sta, sta->sta_state - 1);
if (err) {
ret = sta_info_move_state(sta, sta->sta_state - 1);
if (ret) {
WARN_ON_ONCE(1);
break;
}
}
if (sta->uploaded)
if (sta->uploaded) {
drv_sta_remove(local, sdata, &sta->sta);
ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
IEEE80211_STA_NOTEXIST);
WARN_ON_ONCE(ret != 0);
}
/*
* At this point, after we wait for an RCU grace period,
@ -1404,37 +1443,25 @@ int sta_info_move_state(struct sta_info *sta,
if (sta->sta_state == new_state)
return 0;
/* check allowed transitions first */
switch (new_state) {
case IEEE80211_STA_NONE:
if (sta->sta_state == IEEE80211_STA_AUTH)
clear_bit(WLAN_STA_AUTH, &sta->_flags);
else
if (sta->sta_state != IEEE80211_STA_AUTH)
return -EINVAL;
break;
case IEEE80211_STA_AUTH:
if (sta->sta_state == IEEE80211_STA_NONE)
set_bit(WLAN_STA_AUTH, &sta->_flags);
else if (sta->sta_state == IEEE80211_STA_ASSOC)
clear_bit(WLAN_STA_ASSOC, &sta->_flags);
else
if (sta->sta_state != IEEE80211_STA_NONE &&
sta->sta_state != IEEE80211_STA_ASSOC)
return -EINVAL;
break;
case IEEE80211_STA_ASSOC:
if (sta->sta_state == IEEE80211_STA_AUTH) {
set_bit(WLAN_STA_ASSOC, &sta->_flags);
} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
atomic_dec(&sta->sdata->u.ap.num_sta_authorized);
clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
} else
if (sta->sta_state != IEEE80211_STA_AUTH &&
sta->sta_state != IEEE80211_STA_AUTHORIZED)
return -EINVAL;
break;
case IEEE80211_STA_AUTHORIZED:
if (sta->sta_state == IEEE80211_STA_ASSOC) {
if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
atomic_inc(&sta->sdata->u.ap.num_sta_authorized);
set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
} else
if (sta->sta_state != IEEE80211_STA_ASSOC)
return -EINVAL;
break;
default:
@ -1444,6 +1471,51 @@ int sta_info_move_state(struct sta_info *sta,
printk(KERN_DEBUG "%s: moving STA %pM to state %d\n",
sta->sdata->name, sta->sta.addr, new_state);
/*
* notify the driver before the actual changes so it can
* fail the transition
*/
if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
int err = drv_sta_state(sta->local, sta->sdata, sta,
sta->sta_state, new_state);
if (err)
return err;
}
/* reflect the change in all state variables */
switch (new_state) {
case IEEE80211_STA_NONE:
if (sta->sta_state == IEEE80211_STA_AUTH)
clear_bit(WLAN_STA_AUTH, &sta->_flags);
break;
case IEEE80211_STA_AUTH:
if (sta->sta_state == IEEE80211_STA_NONE)
set_bit(WLAN_STA_AUTH, &sta->_flags);
else if (sta->sta_state == IEEE80211_STA_ASSOC)
clear_bit(WLAN_STA_ASSOC, &sta->_flags);
break;
case IEEE80211_STA_ASSOC:
if (sta->sta_state == IEEE80211_STA_AUTH) {
set_bit(WLAN_STA_ASSOC, &sta->_flags);
} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
atomic_dec(&sta->sdata->u.ap.num_sta_authorized);
clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
}
break;
case IEEE80211_STA_AUTHORIZED:
if (sta->sta_state == IEEE80211_STA_ASSOC) {
if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
atomic_inc(&sta->sdata->u.ap.num_sta_authorized);
set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
}
break;
default:
break;
}
sta->sta_state = new_state;
return 0;

9
net/mac80211/sta_info.h
View File

@ -75,15 +75,6 @@ enum ieee80211_sta_info_flags {
WLAN_STA_INSERTED,
};
enum ieee80211_sta_state {
/* NOTE: These need to be ordered correctly! */
IEEE80211_STA_NOTEXIST,
IEEE80211_STA_NONE,
IEEE80211_STA_AUTH,
IEEE80211_STA_ASSOC,
IEEE80211_STA_AUTHORIZED,
};
#define STA_TID_NUM 16
#define ADDBA_RESP_INTERVAL HZ
#define HT_AGG_MAX_RETRIES 15

10
net/mac80211/util.c
View File

@ -1184,8 +1184,16 @@ int ieee80211_reconfig(struct ieee80211_local *local)
/* add STAs back */
mutex_lock(&local->sta_mtx);
list_for_each_entry(sta, &local->sta_list, list) {
if (sta->uploaded)
if (sta->uploaded) {
enum ieee80211_sta_state state;
WARN_ON(drv_sta_add(local, sta->sdata, &sta->sta));
for (state = IEEE80211_STA_NOTEXIST;
state < sta->sta_state - 1; state++)
WARN_ON(drv_sta_state(local, sta->sdata, sta,
state, state + 1));
}
}
mutex_unlock(&local->sta_mtx);