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mac80211: Retry null data frame for power save.

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Even if the null data frame is not acked by the AP, mac80211
goes into power save. This might lead to loss of frames
from the AP.
Prevent this by restarting dynamic_ps_timer when ack is not
received for null data frames.

Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vivek Natarajan 2010-02-09 14:50:28 +05:30 committed by John W. Linville
parent e15276a4b2
commit 375177bf35
4 changed files with 37 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/mac80211.h
View File

@ -945,6 +945,11 @@ enum ieee80211_tkip_key_type {
* Hardware supports Unscheduled Automatic Power Save Delivery
* (U-APSD) in managed mode. The mode is configured with
* conf_tx() operation.
*
* @IEEE80211_HW_REPORTS_TX_ACK_STATUS:
* Hardware can provide ack status reports of Tx frames to
* the stack.
*
*/
enum ieee80211_hw_flags {
IEEE80211_HW_HAS_RATE_CONTROL = 1<<0,
@ -965,6 +970,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_SUPPORTS_STATIC_SMPS = 1<<15,
IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS = 1<<16,
IEEE80211_HW_SUPPORTS_UAPSD = 1<<17,
IEEE80211_HW_REPORTS_TX_ACK_STATUS = 1<<18,
};
/**

1
net/mac80211/ieee80211_i.h
View File

@ -316,6 +316,7 @@ enum ieee80211_sta_flags {
IEEE80211_STA_CSA_RECEIVED = BIT(5),
IEEE80211_STA_MFP_ENABLED = BIT(6),
IEEE80211_STA_UAPSD_ENABLED = BIT(7),
IEEE80211_STA_NULLFUNC_ACKED = BIT(8),
};
struct ieee80211_if_managed {

20
net/mac80211/mlme.c
View File

@ -434,8 +434,11 @@ static void ieee80211_enable_ps(struct ieee80211_local *local,
} else {
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
ieee80211_send_nullfunc(local, sdata, 1);
conf->flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
conf->flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
}
}
@ -541,6 +544,7 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
container_of(work, struct ieee80211_local,
dynamic_ps_enable_work);
struct ieee80211_sub_if_data *sdata = local->ps_sdata;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
/* can only happen when PS was just disabled anyway */
if (!sdata)
@ -549,11 +553,16 @@ void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
if (local->hw.conf.flags & IEEE80211_CONF_PS)
return;
if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
(!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
ieee80211_send_nullfunc(local, sdata, 1);
local->hw.conf.flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) ||
(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
local->hw.conf.flags |= IEEE80211_CONF_PS;
ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}
}
void ieee80211_dynamic_ps_timer(unsigned long data)
@ -1892,6 +1901,7 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
return -ENOMEM;
ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||

17
net/mac80211/status.c
View File

@ -188,6 +188,7 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
rcu_read_lock();
sband = local->hw.wiphy->bands[info->band];
fc = hdr->frame_control;
for_each_sta_info(local, hdr->addr1, sta, tmp) {
/* skip wrong virtual interface */
@ -205,8 +206,6 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
return;
}
fc = hdr->frame_control;
if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
(ieee80211_is_data_qos(fc))) {
u16 tid, ssn;
@ -275,6 +274,20 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
local->dot11FailedCount++;
}
if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
local->ps_sdata && !(local->scanning)) {
if (info->flags & IEEE80211_TX_STAT_ACK) {
local->ps_sdata->u.mgd.flags |=
IEEE80211_STA_NULLFUNC_ACKED;
ieee80211_queue_work(&local->hw,
&local->dynamic_ps_enable_work);
} else
mod_timer(&local->dynamic_ps_timer, jiffies +
msecs_to_jiffies(10));
}
/* this was a transmitted frame, but now we want to reuse it */
skb_orphan(skb);