Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next into for-davem

Conflicts:
	drivers/net/wireless/b43legacy/dma.c

4 files changed, 126 insertions, 50 deletions

diff --git a/drivers/net/wireless/b43legacy/b43legacy.h b/drivers/net/wireless/b43legacy/b43legacy.h
index 1d4fc9db7f5..98e3d44400c 100644
--- a/drivers/net/wireless/b43legacy/b43legacy.h
+++ b/drivers/net/wireless/b43legacy/b43legacy.h
@@ -560,8 +560,16 @@ struct b43legacy_key {
 	u8 algorithm;
 };
 
+#define B43legacy_QOS_QUEUE_NUM	4
+
 struct b43legacy_wldev;
 
+/* QOS parameters for a queue. */
+struct b43legacy_qos_params {
+	/* The QOS parameters */
+	struct ieee80211_tx_queue_params p;
+};
+
 /* Data structure for the WLAN parts (802.11 cores) of the b43legacy chip. */
 struct b43legacy_wl {
 	/* Pointer to the active wireless device on this chip */
@@ -611,6 +619,18 @@ struct b43legacy_wl {
 	bool beacon1_uploaded;
 	bool beacon_templates_virgin; /* Never wrote the templates? */
 	struct work_struct beacon_update_trigger;
+	/* The current QOS parameters for the 4 queues. */
+	struct b43legacy_qos_params qos_params[B43legacy_QOS_QUEUE_NUM];
+
+	/* Packet transmit work */
+	struct work_struct tx_work;
+
+	/* Queue of packets to be transmitted. */
+	struct sk_buff_head tx_queue[B43legacy_QOS_QUEUE_NUM];
+
+	/* Flag that implement the queues stopping. */
+	bool tx_queue_stopped[B43legacy_QOS_QUEUE_NUM];
+
 };
 
 /* Pointers to the firmware data and meta information about it. */
diff --git a/drivers/net/wireless/b43legacy/dma.c b/drivers/net/wireless/b43legacy/dma.c
index 1ee31c55c7b..f1f8bd09bd8 100644
--- a/drivers/net/wireless/b43legacy/dma.c
+++ b/drivers/net/wireless/b43legacy/dma.c
@@ -727,7 +727,6 @@ struct b43legacy_dmaring *b43legacy_setup_dmaring(struct b43legacy_wldev *dev,
 		} else
 			B43legacy_WARN_ON(1);
 	}
-	spin_lock_init(&ring->lock);
 #ifdef CONFIG_B43LEGACY_DEBUG
 	ring->last_injected_overflow = jiffies;
 #endif
@@ -1144,10 +1143,8 @@ int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 {
 	struct b43legacy_dmaring *ring;
 	int err = 0;
-	unsigned long flags;
 
 	ring = priority_to_txring(dev, skb_get_queue_mapping(skb));
-	spin_lock_irqsave(&ring->lock, flags);
 	B43legacy_WARN_ON(!ring->tx);
 
 	if (unlikely(ring->stopped)) {
@@ -1157,16 +1154,14 @@ int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 		 * For now, just refuse the transmit. */
 		if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
 			b43legacyerr(dev->wl, "Packet after queue stopped\n");
-		err = -ENOSPC;
-		goto out_unlock;
+		return -ENOSPC;
 	}
 
 	if (unlikely(WARN_ON(free_slots(ring) < SLOTS_PER_PACKET))) {
 		/* If we get here, we have a real error with the queue
 		 * full, but queues not stopped. */
 		b43legacyerr(dev->wl, "DMA queue overflow\n");
-		err = -ENOSPC;
-		goto out_unlock;
+		return -ENOSPC;
 	}
 
 	/* dma_tx_fragment might reallocate the skb, so invalidate pointers pointing
@@ -1176,25 +1171,23 @@ int b43legacy_dma_tx(struct b43legacy_wldev *dev,
 		/* Drop this packet, as we don't have the encryption key
 		 * anymore and must not transmit it unencrypted. */
 		dev_kfree_skb_any(skb);
-		err = 0;
-		goto out_unlock;
+		return 0;
 	}
 	if (unlikely(err)) {
 		b43legacyerr(dev->wl, "DMA tx mapping failure\n");
-		goto out_unlock;
+		return err;
 	}
 	if ((free_slots(ring) < SLOTS_PER_PACKET) ||
 	    should_inject_overflow(ring)) {
 		/* This TX ring is full. */
-		ieee80211_stop_queue(dev->wl->hw, txring_to_priority(ring));
+		unsigned int skb_mapping = skb_get_queue_mapping(skb);
+		ieee80211_stop_queue(dev->wl->hw, skb_mapping);
+		dev->wl->tx_queue_stopped[skb_mapping] = 1;
 		ring->stopped = true;
 		if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
 			b43legacydbg(dev->wl, "Stopped TX ring %d\n",
 			       ring->index);
 	}
-out_unlock:
-	spin_unlock_irqrestore(&ring->lock, flags);
-
 	return err;
 }
 
@@ -1205,14 +1198,29 @@ void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
 	struct b43legacy_dmadesc_meta *meta;
 	int retry_limit;
 	int slot;
+	int firstused;
 
 	ring = parse_cookie(dev, status->cookie, &slot);
 	if (unlikely(!ring))
 		return;
-	B43legacy_WARN_ON(!irqs_disabled());
-	spin_lock(&ring->lock);
-
 	B43legacy_WARN_ON(!ring->tx);
+
+	/* Sanity check: TX packets are processed in-order on one ring.
+	 * Check if the slot deduced from the cookie really is the first
+	 * used slot. */
+	firstused = ring->current_slot - ring->used_slots + 1;
+	if (firstused < 0)
+		firstused = ring->nr_slots + firstused;
+	if (unlikely(slot != firstused)) {
+		/* This possibly is a firmware bug and will result in
+		 * malfunction, memory leaks and/or stall of DMA functionality.
+		 */
+		b43legacydbg(dev->wl, "Out of order TX status report on DMA "
+			     "ring %d. Expected %d, but got %d\n",
+			     ring->index, firstused, slot);
+		return;
+	}
+
 	while (1) {
 		B43legacy_WARN_ON(!(slot >= 0 && slot < ring->nr_slots));
 		op32_idx2desc(ring, slot, &meta);
@@ -1285,14 +1293,21 @@ void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
 	dev->stats.last_tx = jiffies;
 	if (ring->stopped) {
 		B43legacy_WARN_ON(free_slots(ring) < SLOTS_PER_PACKET);
-		ieee80211_wake_queue(dev->wl->hw, txring_to_priority(ring));
 		ring->stopped = false;
+	}
+
+	if (dev->wl->tx_queue_stopped[ring->queue_prio]) {
+		dev->wl->tx_queue_stopped[ring->queue_prio] = 0;
+	} else {
+		/* If the driver queue is running wake the corresponding
+		 * mac80211 queue. */
+		ieee80211_wake_queue(dev->wl->hw, ring->queue_prio);
 		if (b43legacy_debug(dev, B43legacy_DBG_DMAVERBOSE))
 			b43legacydbg(dev->wl, "Woke up TX ring %d\n",
-			       ring->index);
+				     ring->index);
 	}
-
-	spin_unlock(&ring->lock);
+	/* Add work to the queue. */
+	ieee80211_queue_work(dev->wl->hw, &dev->wl->tx_work);
 }
 
 static void dma_rx(struct b43legacy_dmaring *ring,
@@ -1415,22 +1430,14 @@ void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
 
 static void b43legacy_dma_tx_suspend_ring(struct b43legacy_dmaring *ring)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&ring->lock, flags);
 	B43legacy_WARN_ON(!ring->tx);
 	op32_tx_suspend(ring);
-	spin_unlock_irqrestore(&ring->lock, flags);
 }
 
 static void b43legacy_dma_tx_resume_ring(struct b43legacy_dmaring *ring)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(&ring->lock, flags);
 	B43legacy_WARN_ON(!ring->tx);
 	op32_tx_resume(ring);
-	spin_unlock_irqrestore(&ring->lock, flags);
 }
 
 void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
diff --git a/drivers/net/wireless/b43legacy/dma.h b/drivers/net/wireless/b43legacy/dma.h
index 504a58767e9..c3282f906bc 100644
--- a/drivers/net/wireless/b43legacy/dma.h
+++ b/drivers/net/wireless/b43legacy/dma.h
@@ -150,8 +150,9 @@ struct b43legacy_dmaring {
 	enum b43legacy_dmatype type;
 	/* Boolean. Is this ring stopped at ieee80211 level? */
 	bool stopped;
-	/* Lock, only used for TX. */
-	spinlock_t lock;
+	/* The QOS priority assigned to this ring. Only used for TX rings.
+	 * This is the mac80211 "queue" value. */
+	u8 queue_prio;
 	struct b43legacy_wldev *dev;
 #ifdef CONFIG_B43LEGACY_DEBUG
 	/* Maximum number of used slots. */
diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index 200138cdb03..75e70bce40f 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -2440,30 +2440,64 @@ static int b43legacy_rng_init(struct b43legacy_wl *wl)
 	return err;
 }
 
+static void b43legacy_tx_work(struct work_struct *work)
+{
+	struct b43legacy_wl *wl = container_of(work, struct b43legacy_wl,
+				  tx_work);
+	struct b43legacy_wldev *dev;
+	struct sk_buff *skb;
+	int queue_num;
+	int err = 0;
+
+	mutex_lock(&wl->mutex);
+	dev = wl->current_dev;
+	if (unlikely(!dev || b43legacy_status(dev) < B43legacy_STAT_STARTED)) {
+		mutex_unlock(&wl->mutex);
+		return;
+	}
+
+	for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
+		while (skb_queue_len(&wl->tx_queue[queue_num])) {
+			skb = skb_dequeue(&wl->tx_queue[queue_num]);
+			if (b43legacy_using_pio(dev))
+				err = b43legacy_pio_tx(dev, skb);
+			else
+				err = b43legacy_dma_tx(dev, skb);
+			if (err == -ENOSPC) {
+				wl->tx_queue_stopped[queue_num] = 1;
+				ieee80211_stop_queue(wl->hw, queue_num);
+				skb_queue_head(&wl->tx_queue[queue_num], skb);
+				break;
+			}
+			if (unlikely(err))
+				dev_kfree_skb(skb); /* Drop it */
+			err = 0;
+		}
+
+		if (!err)
+			wl->tx_queue_stopped[queue_num] = 0;
+	}
+
+	mutex_unlock(&wl->mutex);
+}
+
 static void b43legacy_op_tx(struct ieee80211_hw *hw,
 			    struct sk_buff *skb)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
-	struct b43legacy_wldev *dev = wl->current_dev;
-	int err = -ENODEV;
-	unsigned long flags;
 
-	if (unlikely(!dev))
-		goto out;
-	if (unlikely(b43legacy_status(dev) < B43legacy_STAT_STARTED))
-		goto out;
-	/* DMA-TX is done without a global lock. */
-	if (b43legacy_using_pio(dev)) {
-		spin_lock_irqsave(&wl->irq_lock, flags);
-		err = b43legacy_pio_tx(dev, skb);
-		spin_unlock_irqrestore(&wl->irq_lock, flags);
-	} else
-		err = b43legacy_dma_tx(dev, skb);
-out:
-	if (unlikely(err)) {
-		/* Drop the packet. */
+	if (unlikely(skb->len < 2 + 2 + 6)) {
+		/* Too short, this can't be a valid frame. */
 		dev_kfree_skb_any(skb);
+		return;
 	}
+	B43legacy_WARN_ON(skb_shinfo(skb)->nr_frags);
+
+	skb_queue_tail(&wl->tx_queue[skb->queue_mapping], skb);
+	if (!wl->tx_queue_stopped[skb->queue_mapping])
+		ieee80211_queue_work(wl->hw, &wl->tx_work);
+	else
+		ieee80211_stop_queue(wl->hw, skb->queue_mapping);
 }
 
 static int b43legacy_op_conf_tx(struct ieee80211_hw *hw,
@@ -2879,6 +2913,7 @@ static void b43legacy_wireless_core_stop(struct b43legacy_wldev *dev)
 {
 	struct b43legacy_wl *wl = dev->wl;
 	unsigned long flags;
+	int queue_num;
 
 	if (b43legacy_status(dev) < B43legacy_STAT_STARTED)
 		return;
@@ -2898,11 +2933,16 @@ static void b43legacy_wireless_core_stop(struct b43legacy_wldev *dev)
 	/* Must unlock as it would otherwise deadlock. No races here.
 	 * Cancel the possibly running self-rearming periodic work. */
 	cancel_delayed_work_sync(&dev->periodic_work);
+	cancel_work_sync(&wl->tx_work);
 	mutex_lock(&wl->mutex);
 
-	ieee80211_stop_queues(wl->hw); /* FIXME this could cause a deadlock */
+	/* Drain all TX queues. */
+	for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
+		while (skb_queue_len(&wl->tx_queue[queue_num]))
+			dev_kfree_skb(skb_dequeue(&wl->tx_queue[queue_num]));
+	}
 
-	b43legacy_mac_suspend(dev);
+b43legacy_mac_suspend(dev);
 	free_irq(dev->dev->irq, dev);
 	b43legacydbg(wl, "Wireless interface stopped\n");
 }
@@ -3748,6 +3788,7 @@ static int b43legacy_wireless_init(struct ssb_device *dev)
 	struct ieee80211_hw *hw;
 	struct b43legacy_wl *wl;
 	int err = -ENOMEM;
+	int queue_num;
 
 	b43legacy_sprom_fixup(dev->bus);
 
@@ -3782,6 +3823,13 @@ static int b43legacy_wireless_init(struct ssb_device *dev)
 	mutex_init(&wl->mutex);
 	INIT_LIST_HEAD(&wl->devlist);
 	INIT_WORK(&wl->beacon_update_trigger, b43legacy_beacon_update_trigger_work);
+	INIT_WORK(&wl->tx_work, b43legacy_tx_work);
+
+	/* Initialize queues and flags. */
+	for (queue_num = 0; queue_num < B43legacy_QOS_QUEUE_NUM; queue_num++) {
+		skb_queue_head_init(&wl->tx_queue[queue_num]);
+		wl->tx_queue_stopped[queue_num] = 0;
+	}
 
 	ssb_set_devtypedata(dev, wl);
 	b43legacyinfo(wl, "Broadcom %04X WLAN found (core revision %u)\n",