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mac80211: wait for beacon before enabling powersave

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Because DTIM information is required for powersave
but is only conveyed in beacons, wait for a beacon
before enabling powersave, and change the way the
information is conveyed to the driver accordingly.

mwl8k doesn't currently seem to implement PS but
requires the DTIM period in a different way; after
talking to Lennert we agreed to just have mwl8k do
the parsing itself in the finalize_join work.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-01-26 14:19:52 +01:00 committed by John W. Linville
parent c21dbf9214
commit 56007a028c
7 changed files with 47 additions and 35 deletions
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2
drivers/net/wireless/iwlwifi/iwl-power.c
View file

@ -319,7 +319,7 @@ int iwl_power_update_mode(struct iwl_priv *priv, bool force)
priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
if (priv->vif)
dtimper = priv->vif->bss_conf.dtim_period;
dtimper = priv->hw->conf.ps_dtim_period;
else
dtimper = 1;

14
drivers/net/wireless/mwl8k.c
View file

@ -3881,12 +3881,16 @@ static void mwl8k_finalize_join_worker(struct work_struct *work)
struct mwl8k_priv *priv =
container_of(work, struct mwl8k_priv, finalize_join_worker);
struct sk_buff *skb = priv->beacon_skb;
struct mwl8k_vif *mwl8k_vif;
struct ieee80211_mgmt *mgmt = (void *)skb->data;
int len = skb->len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
const u8 *tim = cfg80211_find_ie(WLAN_EID_TIM,
mgmt->u.beacon.variable, len);
int dtim_period = 1;
mwl8k_vif = mwl8k_first_vif(priv);
if (mwl8k_vif != NULL)
mwl8k_cmd_finalize_join(priv->hw, skb->data, skb->len,
mwl8k_vif->vif->bss_conf.dtim_period);
if (tim && tim[1] >= 2)
dtim_period = tim[3];
mwl8k_cmd_finalize_join(priv->hw, skb->data, skb->len, dtim_period);
dev_kfree_skb(skb);
priv->beacon_skb = NULL;

3
drivers/net/wireless/wl12xx/wl1251.h
View file

@ -341,9 +341,6 @@ struct wl1251 {
/* Are we currently scanning */
bool scanning;
/* Our association ID */
u16 aid;
/* Default key (for WEP) */
u32 default_key;

25
drivers/net/wireless/wl12xx/wl1251_main.c
View file

@ -617,10 +617,13 @@ static int wl1251_op_config(struct ieee80211_hw *hw, u32 changed)
wl->psm_requested = true;
wl->dtim_period = conf->ps_dtim_period;
ret = wl1251_acx_wr_tbtt_and_dtim(wl, wl->beacon_int,
wl->dtim_period);
/*
* We enter PSM only if we're already associated.
* If we're not, we'll enter it when joining an SSID,
* through the bss_info_changed() hook.
* mac80211 enables PSM only if we're already associated.
*/
ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
if (ret < 0)
@ -943,7 +946,6 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
struct ieee80211_bss_conf *bss_conf,
u32 changed)
{
enum wl1251_cmd_ps_mode mode;
struct wl1251 *wl = hw->priv;
struct sk_buff *beacon, *skb;
int ret;
@ -984,11 +986,6 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
if (changed & BSS_CHANGED_ASSOC) {
if (bss_conf->assoc) {
wl->beacon_int = bss_conf->beacon_int;
wl->dtim_period = bss_conf->dtim_period;
ret = wl1251_acx_wr_tbtt_and_dtim(wl, wl->beacon_int,
wl->dtim_period);
wl->aid = bss_conf->aid;
skb = ieee80211_pspoll_get(wl->hw, wl->vif);
if (!skb)
@ -1001,17 +998,9 @@ static void wl1251_op_bss_info_changed(struct ieee80211_hw *hw,
if (ret < 0)
goto out_sleep;
ret = wl1251_acx_aid(wl, wl->aid);
ret = wl1251_acx_aid(wl, bss_conf->aid);
if (ret < 0)
goto out_sleep;
/* If we want to go in PSM but we're not there yet */
if (wl->psm_requested && !wl->psm) {
mode = STATION_POWER_SAVE_MODE;
ret = wl1251_ps_set_mode(wl, mode);
if (ret < 0)
goto out_sleep;
}
} else {
/* use defaults when not associated */
wl->beacon_int = WL1251_DEFAULT_BEACON_INT;

7
include/net/mac80211.h
View file

@ -186,7 +186,8 @@ enum ieee80211_bss_change {
* @use_short_slot: use short slot time (only relevant for ERP);
* if the hardware cannot handle this it must set the
* IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE hardware flag
* @dtim_period: num of beacons before the next DTIM, for PSM
* @dtim_period: num of beacons before the next DTIM, for beaconing,
* not valid in station mode (cf. hw conf ps_dtim_period)
* @timestamp: beacon timestamp
* @beacon_int: beacon interval
* @assoc_capability: capabilities taken from assoc resp
@ -648,6 +649,9 @@ enum ieee80211_smps_mode {
* value will be only achievable between DTIM frames, the hardware
* needs to check for the multicast traffic bit in DTIM beacons.
* This variable is valid only when the CONF_PS flag is set.
* @ps_dtim_period: The DTIM period of the AP we're connected to, for use
* in power saving. Power saving will not be enabled until a beacon
* has been received and the DTIM period is known.
* @dynamic_ps_timeout: The dynamic powersave timeout (in ms), see the
* powersave documentation below. This variable is valid only when
* the CONF_PS flag is set.
@ -674,6 +678,7 @@ struct ieee80211_conf {
int max_sleep_period;
u16 listen_interval;
u8 ps_dtim_period;
u8 long_frame_max_tx_count, short_frame_max_tx_count;

27
net/mac80211/mlme.c
View file

@ -484,6 +484,7 @@ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
if (count == 1 && found->u.mgd.powersave &&
found->u.mgd.associated &&
found->u.mgd.associated->beacon_ies &&
!(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL))) {
s32 beaconint_us;
@ -497,14 +498,22 @@ void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
if (beaconint_us > latency) {
local->ps_sdata = NULL;
} else {
u8 dtimper = found->vif.bss_conf.dtim_period;
struct ieee80211_bss *bss;
int maxslp = 1;
u8 dtimper;
if (dtimper > 1)
bss = (void *)found->u.mgd.associated->priv;
dtimper = bss->dtim_period;
/* If the TIM IE is invalid, pretend the value is 1 */
if (!dtimper)
dtimper = 1;
else if (dtimper > 1)
maxslp = min_t(int, dtimper,
latency / beaconint_us);
local->hw.conf.max_sleep_period = maxslp;
local->hw.conf.ps_dtim_period = dtimper;
local->ps_sdata = found;
}
} else {
@ -702,7 +711,6 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
/* set timing information */
sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
sdata->vif.bss_conf.timestamp = cbss->tsf;
sdata->vif.bss_conf.dtim_period = bss->dtim_period;
bss_info_changed |= BSS_CHANGED_BEACON_INT;
bss_info_changed |= ieee80211_handle_bss_capability(sdata,
@ -1168,6 +1176,13 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
int freq;
struct ieee80211_bss *bss;
struct ieee80211_channel *channel;
bool need_ps = false;
if (sdata->u.mgd.associated) {
bss = (void *)sdata->u.mgd.associated->priv;
/* not previously set so we may need to recalc */
need_ps = !bss->dtim_period;
}
if (elems->ds_params && elems->ds_params_len == 1)
freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
@ -1187,6 +1202,12 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
if (!sdata->u.mgd.associated)
return;
if (need_ps) {
mutex_lock(&local->iflist_mtx);
ieee80211_recalc_ps(local, -1);
mutex_unlock(&local->iflist_mtx);
}
if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
(memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
ETH_ALEN) == 0)) {

4
net/mac80211/scan.c
View file

@ -111,10 +111,6 @@ ieee80211_bss_info_update(struct ieee80211_local *local,
bss->dtim_period = tim_ie->dtim_period;
}
/* set default value for buggy AP/no TIM element */
if (bss->dtim_period == 0)
bss->dtim_period = 1;
bss->supp_rates_len = 0;
if (elems->supp_rates) {
clen = IEEE80211_MAX_SUPP_RATES - bss->supp_rates_len;