wl12xx: AP-mode - management of links in PS-mode
Update the PS mode of each link according to a bitmap polled from
fw_status. Manually notify mac80211 about PS mode changes in connected
stations.
mac80211 will only be notified about PS start when the station is in PS
and there is a small number of TX blocks from this link ready in HW.
This is required for waking up the remote station since the TIM is
updated entirely by FW.
When a station enters mac80211-PS-mode, we drop all the skbs in the
low-level TX queues belonging to this sta with STAT_TX_FILTERED
to keep our queues clean.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/ps.c b/drivers/net/wireless/wl12xx/ps.c
index b7b3139..5c347b1 100644
--- a/drivers/net/wireless/wl12xx/ps.c
+++ b/drivers/net/wireless/wl12xx/ps.c
@@ -24,6 +24,7 @@
#include "reg.h"
#include "ps.h"
#include "io.h"
+#include "tx.h"
#define WL1271_WAKEUP_TIMEOUT 500
@@ -172,3 +173,82 @@
return ret;
}
+
+static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
+{
+ int i, filtered = 0;
+ struct sk_buff *skb;
+ struct ieee80211_tx_info *info;
+ unsigned long flags;
+
+ /* filter all frames currently the low level queus for this hlid */
+ for (i = 0; i < NUM_TX_QUEUES; i++) {
+ while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
+ info = IEEE80211_SKB_CB(skb);
+ info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
+ info->status.rates[0].idx = -1;
+ ieee80211_tx_status(wl->hw, skb);
+ filtered++;
+ }
+ }
+
+ spin_lock_irqsave(&wl->wl_lock, flags);
+ wl->tx_queue_count -= filtered;
+ spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+ wl1271_handle_tx_low_watermark(wl);
+}
+
+void wl1271_ps_link_start(struct wl1271 *wl, u8 hlid, bool clean_queues)
+{
+ struct ieee80211_sta *sta;
+
+ if (test_bit(hlid, &wl->ap_ps_map))
+ return;
+
+ wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d blks %d "
+ "clean_queues %d", hlid, wl->links[hlid].allocated_blks,
+ clean_queues);
+
+ rcu_read_lock();
+ sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
+ if (!sta) {
+ wl1271_error("could not find sta %pM for starting ps",
+ wl->links[hlid].addr);
+ rcu_read_unlock();
+ return;
+ }
+
+ ieee80211_sta_ps_transition_ni(sta, true);
+ rcu_read_unlock();
+
+ /* do we want to filter all frames from this link's queues? */
+ if (clean_queues)
+ wl1271_ps_filter_frames(wl, hlid);
+
+ __set_bit(hlid, &wl->ap_ps_map);
+}
+
+void wl1271_ps_link_end(struct wl1271 *wl, u8 hlid)
+{
+ struct ieee80211_sta *sta;
+
+ if (!test_bit(hlid, &wl->ap_ps_map))
+ return;
+
+ wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
+
+ __clear_bit(hlid, &wl->ap_ps_map);
+
+ rcu_read_lock();
+ sta = ieee80211_find_sta(wl->vif, wl->links[hlid].addr);
+ if (!sta) {
+ wl1271_error("could not find sta %pM for ending ps",
+ wl->links[hlid].addr);
+ goto end;
+ }
+
+ ieee80211_sta_ps_transition_ni(sta, false);
+end:
+ rcu_read_unlock();
+}