wl12xx: AP-mode - count free FW TX blocks per link

Count the number of FW TX blocks allocated per link. We add blocks to a
link counter when allocated for a TX descriptor. We remove blocks
according to counters in fw_status indicating the number of freed blocks
in FW. These counters are polled after each IRQ.
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

drivers/net/wireless/wl12xx/main.c

@@ -574,6 +574,17 @@ static void wl1271_fw_status(struct wl1271 *wl,
 	if (total)
 		clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
 
+	if (wl->bss_type == BSS_TYPE_AP_BSS) {
+		for (i = 0; i < AP_MAX_LINKS; i++) {
+			u8 cnt = status->tx_lnk_free_blks[i] -
+				wl->links[i].prev_freed_blks;
+
+			wl->links[i].prev_freed_blks =
+				status->tx_lnk_free_blks[i];
+			wl->links[i].allocated_blks -= cnt;
+		}
+	}
+
 	/* update the host-chipset time offset */
 	getnstimeofday(&ts);
 	wl->time_offset = (timespec_to_ns(&ts) >> 10) -

drivers/net/wireless/wl12xx/ps.c

@@ -172,5 +172,3 @@ int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
 
 	return ret;
 }
-
-

drivers/net/wireless/wl12xx/tx.c

@@ -108,7 +108,7 @@ u8 wl1271_tx_get_hlid(struct sk_buff *skb)
 }
 
 static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
-				u32 buf_offset)
+				u32 buf_offset, u8 hlid)
 {
 	struct wl1271_tx_hw_descr *desc;
 	u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
@@ -137,6 +137,9 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
 
 		wl->tx_blocks_available -= total_blocks;
 
+		if (wl->bss_type == BSS_TYPE_AP_BSS)
+			wl->links[hlid].allocated_blks += total_blocks;
+
 		ret = 0;
 
 		wl1271_debug(DEBUG_TX,
@@ -150,7 +153,8 @@ static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra,
 }
 
 static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
-			      u32 extra, struct ieee80211_tx_info *control)
+			      u32 extra, struct ieee80211_tx_info *control,
+			      u8 hlid)
 {
 	struct timespec ts;
 	struct wl1271_tx_hw_descr *desc;
@@ -186,7 +190,7 @@ static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
 	desc->tid = ac;
 
 	if (wl->bss_type != BSS_TYPE_AP_BSS) {
-		desc->aid = TX_HW_DEFAULT_AID;
+		desc->aid = hlid;
 
 		/* if the packets are destined for AP (have a STA entry)
 		   send them with AP rate policies, otherwise use default
@@ -196,25 +200,17 @@ static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
 		else
 			rate_idx = ACX_TX_BASIC_RATE;
 	} else {
-		if (control->control.sta) {
-			struct wl1271_station *wl_sta;
-
-			wl_sta = (struct wl1271_station *)
-					control->control.sta->drv_priv;
-			desc->hlid = wl_sta->hlid;
-			rate_idx = ac;
-		} else {
-			struct ieee80211_hdr *hdr;
-
-			hdr = (struct ieee80211_hdr *)
-						(skb->data + sizeof(*desc));
-			if (ieee80211_is_mgmt(hdr->frame_control)) {
-				desc->hlid = WL1271_AP_GLOBAL_HLID;
+		desc->hlid = hlid;
+		switch (hlid) {
+		case WL1271_AP_GLOBAL_HLID:
 			rate_idx = ACX_TX_AP_MODE_MGMT_RATE;
-			} else {
-				desc->hlid = WL1271_AP_BROADCAST_HLID;
+			break;
+		case WL1271_AP_BROADCAST_HLID:
 			rate_idx = ACX_TX_AP_MODE_BCST_RATE;
-			}
+			break;
+		default:
+			rate_idx = ac;
+			break;
 		}
 	}
 
@@ -245,6 +241,7 @@ static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
 	u32 extra = 0;
 	int ret = 0;
 	u32 total_len;
+	u8 hlid;
 
 	if (!skb)
 		return -EINVAL;
@@ -271,14 +268,19 @@ static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct sk_buff *skb,
 		}
 	}
 
-	ret = wl1271_tx_allocate(wl, skb, extra, buf_offset);
+	if (wl->bss_type == BSS_TYPE_AP_BSS)
+		hlid = wl1271_tx_get_hlid(skb);
+	else
+		hlid = TX_HW_DEFAULT_AID;
+
+	ret = wl1271_tx_allocate(wl, skb, extra, buf_offset, hlid);
 	if (ret < 0)
 		return ret;
 
 	if (wl->bss_type == BSS_TYPE_AP_BSS)
 		wl1271_tx_ap_update_inconnection_sta(wl, skb);
 
-	wl1271_tx_fill_hdr(wl, skb, extra, info);
+	wl1271_tx_fill_hdr(wl, skb, extra, info, hlid);
 
 	/*
 	 * The length of each packet is stored in terms of words. Thus, we must
@@ -635,8 +637,11 @@ void wl1271_tx_reset(struct wl1271 *wl)
 
 	/* TX failure */
 	if (wl->bss_type == BSS_TYPE_AP_BSS) {
-		for (i = 0; i < AP_MAX_LINKS; i++)
+		for (i = 0; i < AP_MAX_LINKS; i++) {
 			wl1271_tx_reset_link_queues(wl, i);
+			wl->links[i].allocated_blks = 0;
+			wl->links[i].prev_freed_blks = 0;
+		}
 
 		wl->last_tx_hlid = 0;
 	} else {

drivers/net/wireless/wl12xx/wl12xx.h

@@ -322,6 +322,10 @@ enum wl12xx_flags {
 struct wl1271_link {
 	/* AP-mode - TX queue per AC in link */
 	struct sk_buff_head tx_queue[NUM_TX_QUEUES];
+
+	/* accounting for allocated / available TX blocks in FW */
+	u8 allocated_blks;
+	u8 prev_freed_blks;
 };
 
 struct wl1271 {