wlcore: use link count for single-STA-PSM optimization

Only allow a PSM STA to congest FW memory when it is the single active
link. Being a single STA doesn't imply a single link - there might be
other links on other roles.

[Changed WARN_ON to WARN_ON_ONCE -- Luca]
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/ti/wlcore/cmd.c

@@ -328,6 +328,8 @@ int wl12xx_allocate_link(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 *hlid)
 			wl->fw_status_2->counters.tx_lnk_free_pkts[link];
 	wl->links[link].wlvif = wlvif;
 	*hlid = link;
+
+	wl->active_link_count++;
 	return 0;
 }
 
@@ -357,6 +359,8 @@ void wl12xx_free_link(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 *hlid)
 	wl->links[*hlid].wlvif = NULL;
 
 	*hlid = WL12XX_INVALID_LINK_ID;
+	wl->active_link_count--;
+	WARN_ON_ONCE(wl->active_link_count < 0);
 }
 
 static u8 wlcore_get_native_channel_type(u8 nl_channel_type)

drivers/net/wireless/ti/wlcore/main.c

@@ -334,10 +334,10 @@ static void wl12xx_irq_ps_regulate_link(struct wl1271 *wl,
 					struct wl12xx_vif *wlvif,
 					u8 hlid, u8 tx_pkts)
 {
-	bool fw_ps, single_sta;
+	bool fw_ps, single_link;
 
 	fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
-	single_sta = (wl->active_sta_count == 1);
+	single_link = (wl->active_link_count == 1);
 
 	/*
 	 * Wake up from high level PS if the STA is asleep with too little
@@ -348,10 +348,10 @@ static void wl12xx_irq_ps_regulate_link(struct wl1271 *wl,
 
 	/*
 	 * Start high-level PS if the STA is asleep with enough blocks in FW.
-	 * Make an exception if this is the only connected station. In this
-	 * case FW-memory congestion is not a problem.
+	 * Make an exception if this is the only connected link. In this
+	 * case FW-memory congestion is less of a problem.
 	 */
-	else if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
+	else if (!single_link && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 		wl12xx_ps_link_start(wl, wlvif, hlid, true);
 }
 
@@ -1890,6 +1890,7 @@ static void wlcore_op_stop_locked(struct wl1271 *wl)
 	memset(wl->roc_map, 0, sizeof(wl->roc_map));
 	memset(wl->session_ids, 0, sizeof(wl->session_ids));
 	wl->active_sta_count = 0;
+	wl->active_link_count = 0;
 
 	/* The system link is always allocated */
 	wl->links[WL12XX_SYSTEM_HLID].allocated_pkts = 0;
@@ -5728,6 +5729,7 @@ struct ieee80211_hw *wlcore_alloc_hw(size_t priv_size, u32 aggr_buf_size,
 	wl->platform_quirks = 0;
 	wl->system_hlid = WL12XX_SYSTEM_HLID;
 	wl->active_sta_count = 0;
+	wl->active_link_count = 0;
 	wl->fwlog_size = 0;
 	init_waitqueue_head(&wl->fwlog_waitq);
 

drivers/net/wireless/ti/wlcore/tx.c

@@ -104,7 +104,7 @@ static void wl1271_tx_regulate_link(struct wl1271 *wl,
 				    struct wl12xx_vif *wlvif,
 				    u8 hlid)
 {
-	bool fw_ps, single_sta;
+	bool fw_ps, single_link;
 	u8 tx_pkts;
 
 	if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
@@ -112,15 +112,15 @@ static void wl1271_tx_regulate_link(struct wl1271 *wl,
 
 	fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
 	tx_pkts = wl->links[hlid].allocated_pkts;
-	single_sta = (wl->active_sta_count == 1);
+	single_link = (wl->active_link_count == 1);
 
 	/*
 	 * if in FW PS and there is enough data in FW we can put the link
 	 * into high-level PS and clean out its TX queues.
-	 * Make an exception if this is the only connected station. In this
-	 * case FW-memory congestion is not a problem.
+	 * Make an exception if this is the only connected link. In this
+	 * case FW-memory congestion is less of a problem.
 	 */
-	if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
+	if (!single_link && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
 		wl12xx_ps_link_start(wl, wlvif, hlid, true);
 }
 

drivers/net/wireless/ti/wlcore/wlcore.h

@@ -369,6 +369,9 @@ struct wl1271 {
 	 */
 	struct wl1271_link links[WL12XX_MAX_LINKS];
 
+	/* number of currently active links */
+	int active_link_count;
+
 	/* Fast/slow links bitmap according to FW */
 	u32 fw_fast_lnk_map;