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@xxxxxxxxxxxxxxxx>
---
The mwl8k part requires the cfg80211 change.
drivers/net/wireless/iwlwifi/iwl-power.c | 2 +-
drivers/net/wireless/mwl8k.c | 14 +++++++++-----
drivers/net/wireless/wl12xx/wl1251.h | 3 ---
drivers/net/wireless/wl12xx/wl1251_main.c | 25 +++++++------------------
include/net/mac80211.h | 7 ++++++-
net/mac80211/mlme.c | 27 ++++++++++++++++++++++++---
net/mac80211/scan.c | 4 ----
7 files changed, 47 insertions(+), 35 deletions(-)
--- wireless-testing.orig/include/net/mac80211.h 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/include/net/mac80211.h 2010-01-26 09:35:50.000000000 +0100
@@ -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
@@ -652,6 +653,9 @@ 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.
@@ -678,6 +682,7 @@ 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;
--- wireless-testing.orig/net/mac80211/mlme.c 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/net/mac80211/mlme.c 2010-01-26 09:35:50.000000000 +0100
@@ -480,6 +480,7 @@ void ieee80211_recalc_ps(struct ieee8021
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;
@@ -493,14 +494,22 @@ void ieee80211_recalc_ps(struct ieee8021
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 {
@@ -698,7 +707,6 @@ static void ieee80211_set_associated(str
/* 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,
@@ -1164,6 +1172,13 @@ static void ieee80211_rx_bss_info(struct
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]);
@@ -1183,6 +1198,12 @@ static void ieee80211_rx_bss_info(struct
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)) {
--- wireless-testing.orig/net/mac80211/scan.c 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/net/mac80211/scan.c 2010-01-26 09:35:50.000000000 +0100
@@ -111,10 +111,6 @@ ieee80211_bss_info_update(struct ieee802
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;
--- wireless-testing.orig/drivers/net/wireless/iwlwifi/iwl-power.c 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/drivers/net/wireless/iwlwifi/iwl-power.c 2010-01-26 09:35:50.000000000 +0100
@@ -319,7 +319,7 @@ int iwl_power_update_mode(struct iwl_pri
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;
--- wireless-testing.orig/drivers/net/wireless/wl12xx/wl1251.h 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/drivers/net/wireless/wl12xx/wl1251.h 2010-01-26 09:35:50.000000000 +0100
@@ -341,9 +341,6 @@ struct wl1251 {
/* Are we currently scanning */
bool scanning;
- /* Our association ID */
- u16 aid;
-
/* Default key (for WEP) */
u32 default_key;
--- wireless-testing.orig/drivers/net/wireless/wl12xx/wl1251_main.c 2010-01-26 09:35:35.000000000 +0100
+++ wireless-testing/drivers/net/wireless/wl12xx/wl1251_main.c 2010-01-26 09:35:50.000000000 +0100
@@ -617,10 +617,13 @@ static int wl1251_op_config(struct ieee8
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(s
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(s
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(s
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;
--- wireless-testing.orig/drivers/net/wireless/mwl8k.c 2010-01-26 09:35:41.000000000 +0100
+++ wireless-testing/drivers/net/wireless/mwl8k.c 2010-01-26 09:35:56.000000000 +0100
@@ -3881,12 +3881,16 @@ static void mwl8k_finalize_join_worker(s
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;
--
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