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authorKalle Valo <kalle.valo@nokia.com>2009-02-10 17:09:31 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-02-13 13:45:17 -0500
commit572e00122190e3064fa19bd9780b146d2d0f1905 (patch)
treeae8423958dd012af1dca83718b3035f2e75c53ec /net/mac80211
parent1fb3606bc5864c64c78ce4e1751e5382a9a5aa84 (diff)
mac80211: use ps-poll when dynamic power save mode is disabled
When a directed tim bit is set, mac80211 currently disables power save ands sends a null frame to the AP. But if dynamic power save is disabled, mac80211 will not enable power save ever gain. Fix this by adding ps-poll functionality to mac80211. When a directed tim bit is set, mac80211 sends a ps-poll frame to the AP and checks for the more data bit in the returned data frames. Using ps-poll is slower than waking up with null frame, but it's saves more power in cases where the traffic is low. Userspace can control if either ps-poll or null wakeup method is used by enabling and disabling dynamic power save. Signed-off-by: Kalle Valo <kalle.valo@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/ieee80211_i.h3
-rw-r--r--net/mac80211/mlme.c54
-rw-r--r--net/mac80211/rx.c34
3 files changed, 88 insertions, 3 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 5a1f19ad43c..67bd5220cf4 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -728,6 +728,7 @@ struct ieee80211_local {
unsigned int wmm_acm; /* bit field of ACM bits (BIT(802.1D tag)) */
bool powersave;
+ bool pspolling;
struct work_struct dynamic_ps_enable_work;
struct work_struct dynamic_ps_disable_work;
struct timer_list dynamic_ps_timer;
@@ -921,6 +922,8 @@ u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
enum ieee80211_band band);
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
u8 *ssid, size_t ssid_len);
+void ieee80211_send_pspoll(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata);
/* scan/BSS handling */
int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 05c8d13d39b..169f10c5104 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -511,6 +511,39 @@ static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
}
+void ieee80211_send_pspoll(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_if_sta *ifsta = &sdata->u.sta;
+ struct ieee80211_pspoll *pspoll;
+ struct sk_buff *skb;
+ u16 fc;
+
+ skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
+ if (!skb) {
+ printk(KERN_DEBUG "%s: failed to allocate buffer for "
+ "pspoll frame\n", sdata->dev->name);
+ return;
+ }
+ skb_reserve(skb, local->hw.extra_tx_headroom);
+
+ pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
+ memset(pspoll, 0, sizeof(*pspoll));
+ fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
+ pspoll->frame_control = cpu_to_le16(fc);
+ pspoll->aid = cpu_to_le16(ifsta->aid);
+
+ /* aid in PS-Poll has its two MSBs each set to 1 */
+ pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
+
+ memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
+ memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);
+
+ ieee80211_tx_skb(sdata, skb, 0);
+
+ return;
+}
+
/* MLME */
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
struct ieee80211_bss *bss)
@@ -1868,9 +1901,24 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
directed_tim = ieee80211_check_tim(&elems, ifsta->aid);
if (directed_tim) {
- local->hw.conf.flags &= ~IEEE80211_CONF_PS;
- ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
- ieee80211_send_nullfunc(local, sdata, 0);
+ if (local->hw.conf.dynamic_ps_timeout > 0) {
+ local->hw.conf.flags &= ~IEEE80211_CONF_PS;
+ ieee80211_hw_config(local,
+ IEEE80211_CONF_CHANGE_PS);
+ ieee80211_send_nullfunc(local, sdata, 0);
+ } else {
+ local->pspolling = true;
+
+ /*
+ * Here is assumed that the driver will be
+ * able to send ps-poll frame and receive a
+ * response even though power save mode is
+ * enabled, but some drivers might require
+ * to disable power save here. This needs
+ * to be investigated.
+ */
+ ieee80211_send_pspoll(local, sdata);
+ }
}
}
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 8e8ddbfcd23..0e030d3fbde 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -731,6 +731,39 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
return result;
}
+static ieee80211_rx_result debug_noinline
+ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx)
+{
+ struct ieee80211_local *local;
+ struct ieee80211_hdr *hdr;
+ struct sk_buff *skb;
+
+ local = rx->local;
+ skb = rx->skb;
+ hdr = (struct ieee80211_hdr *) skb->data;
+
+ if (!local->pspolling)
+ return RX_CONTINUE;
+
+ if (!ieee80211_has_fromds(hdr->frame_control))
+ /* this is not from AP */
+ return RX_CONTINUE;
+
+ if (!ieee80211_is_data(hdr->frame_control))
+ return RX_CONTINUE;
+
+ if (!ieee80211_has_moredata(hdr->frame_control)) {
+ /* AP has no more frames buffered for us */
+ local->pspolling = false;
+ return RX_CONTINUE;
+ }
+
+ /* more data bit is set, let's request a new frame from the AP */
+ ieee80211_send_pspoll(local, rx->sdata);
+
+ return RX_CONTINUE;
+}
+
static void ap_sta_ps_start(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
@@ -1987,6 +2020,7 @@ static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata,
CALL_RXH(ieee80211_rx_h_passive_scan)
CALL_RXH(ieee80211_rx_h_check)
CALL_RXH(ieee80211_rx_h_decrypt)
+ CALL_RXH(ieee80211_rx_h_check_more_data)
CALL_RXH(ieee80211_rx_h_sta_process)
CALL_RXH(ieee80211_rx_h_defragment)
CALL_RXH(ieee80211_rx_h_ps_poll)