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authorIvo van Doorn <IvDoorn@gmail.com>2008-06-06 22:53:14 +0200
committerJohn W. Linville <linville@tuxdriver.com>2008-06-14 12:17:56 -0400
commitb869767b6f5049f1d1ede2bb3e48832e0722ca5a (patch)
treea75e43aad931ffdaea889af7b2275f12a16f077a /drivers/net
parent6db3786aee36b32e5ed072ed67fad6d5341b0991 (diff)
rt2x00: Don't kick TX queue after each frame
TX queues shouldn't be kicked after each frame that is put into the queue. This could cause problems during RTS and CTS-to-self as well as with fragmentation. In all those cases you want all frames to be send out in a single burst. Off course we shouldn't let the queue fill up entirely, thus we introduce a 10% threshold which, when reached, will force the frames to be send out regardless of the frame. In addition we should prevent queues to become full in such a way that the tx() handler can fail. Instead of stopping the queue when it is full, we should stop it when it is below the threshold. Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/rt2x00/rt2400pci.c1
-rw-r--r--drivers/net/wireless/rt2x00/rt2500pci.c1
-rw-r--r--drivers/net/wireless/rt2x00/rt2500usb.c1
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00.h2
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00mac.c10
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00pci.c6
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00queue.c28
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00queue.h19
-rw-r--r--drivers/net/wireless/rt2x00/rt2x00usb.c6
-rw-r--r--drivers/net/wireless/rt2x00/rt61pci.c1
-rw-r--r--drivers/net/wireless/rt2x00/rt73usb.c1
11 files changed, 39 insertions, 37 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 94226b47d1d..b5b0ded83e0 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1507,7 +1507,6 @@ static int rt2400pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
*/
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
skbdesc->data = skb->data;
skbdesc->data_len = skb->len;
skbdesc->desc = entry_priv->desc;
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index c8cf8c1d095..74b54c948b8 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1823,7 +1823,6 @@ static int rt2500pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
*/
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
skbdesc->data = skb->data;
skbdesc->data_len = skb->len;
skbdesc->desc = entry_priv->desc;
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 6abb4c5338f..076221413db 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -1711,7 +1711,6 @@ static int rt2500usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
*/
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
skbdesc->data = skb->data + intf->beacon->queue->desc_size;
skbdesc->data_len = skb->len - intf->beacon->queue->desc_size;
skbdesc->desc = skb->data;
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index c7da3c25237..938d375027b 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -826,7 +826,7 @@ struct rt2x00_dev {
* The Beacon array also contains the Atim queue
* if that is supported by the device.
*/
- int data_queues;
+ unsigned int data_queues;
struct data_queue *rx;
struct data_queue *tx;
struct data_queue *bcn;
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
index e7f544c404b..59f273bf5b5 100644
--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -34,7 +34,6 @@ static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
struct sk_buff *frag_skb)
{
struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
- struct skb_frame_desc *skbdesc;
struct ieee80211_tx_info *rts_info;
struct sk_buff *skb;
int size;
@@ -82,13 +81,6 @@ static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
frag_skb->data, size, tx_info,
(struct ieee80211_rts *)(skb->data));
- /*
- * Initialize skb descriptor
- */
- skbdesc = get_skb_frame_desc(skb);
- memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
-
if (rt2x00queue_write_tx_frame(queue, skb)) {
WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
return NETDEV_TX_BUSY;
@@ -163,7 +155,7 @@ int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
return NETDEV_TX_BUSY;
}
- if (rt2x00queue_full(queue))
+ if (rt2x00queue_threshold(queue))
ieee80211_stop_queue(rt2x00dev->hw, qid);
return NETDEV_TX_OK;
diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.c b/drivers/net/wireless/rt2x00/rt2x00pci.c
index a6bac75de9f..9745277c81c 100644
--- a/drivers/net/wireless/rt2x00/rt2x00pci.c
+++ b/drivers/net/wireless/rt2x00/rt2x00pci.c
@@ -170,11 +170,11 @@ void rt2x00pci_txdone(struct rt2x00_dev *rt2x00dev, struct queue_entry *entry,
rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
/*
- * If the data queue was full before the txdone handler
- * we must make sure the packet queue in the mac80211 stack
+ * If the data queue was below the threshold before the txdone
+ * handler we must make sure the packet queue in the mac80211 stack
* is reenabled when the txdone handler has finished.
*/
- if (!rt2x00queue_full(entry->queue))
+ if (!rt2x00queue_threshold(entry->queue))
ieee80211_wake_queue(rt2x00dev->hw, qid);
}
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index f875b7ab09f..493066519ef 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -163,8 +163,8 @@ EXPORT_SYMBOL_GPL(rt2x00queue_create_tx_descriptor);
void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
struct txentry_desc *txdesc)
{
- struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
- struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
+ struct data_queue *queue = entry->queue;
+ struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
rt2x00dev->ops->lib->write_tx_desc(rt2x00dev, entry->skb, txdesc);
@@ -175,16 +175,21 @@ void rt2x00queue_write_tx_descriptor(struct queue_entry *entry,
rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TX, entry->skb);
/*
- * We are done writing the frame to the queue entry,
- * also kick the queue in case the correct flags are set,
- * note that this will automatically filter beacons and
- * RTS/CTS frames since those frames don't have this flag
- * set.
+ * Check if we need to kick the queue, there are however a few rules
+ * 1) Don't kick beacon queue
+ * 2) Don't kick unless this is the last in frame in a burst.
+ * When the burst flag is set, this frame is always followed
+ * by another frame which in some way are related to eachother.
+ * This is true for fragments, RTS or CTS-to-self frames.
+ * 3) Rule 2 can be broken when the available entries
+ * in the queue are less then a certain threshold.
*/
- if (rt2x00dev->ops->lib->kick_tx_queue &&
- !(skbdesc->flags & FRAME_DESC_DRIVER_GENERATED))
- rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev,
- entry->queue->qid);
+ if (entry->queue->qid == QID_BEACON)
+ return;
+
+ if (rt2x00queue_threshold(queue) ||
+ !test_bit(ENTRY_TXD_BURST, &txdesc->flags))
+ rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, queue->qid);
}
EXPORT_SYMBOL_GPL(rt2x00queue_write_tx_descriptor);
@@ -349,6 +354,7 @@ static int rt2x00queue_alloc_entries(struct data_queue *queue,
rt2x00queue_reset(queue);
queue->limit = qdesc->entry_num;
+ queue->threshold = DIV_ROUND_UP(qdesc->entry_num, 10);
queue->data_size = qdesc->data_size;
queue->desc_size = qdesc->desc_size;
diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.h b/drivers/net/wireless/rt2x00/rt2x00queue.h
index 303d5568470..623fc27dc7b 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.h
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.h
@@ -82,12 +82,10 @@ enum data_queue_qid {
/**
* enum skb_frame_desc_flags: Flags for &struct skb_frame_desc
*
- * @FRAME_DESC_DRIVER_GENERATED: Frame was generated inside driver
- * and should not be reported back to mac80211 during txdone.
*/
-enum skb_frame_desc_flags {
- FRAME_DESC_DRIVER_GENERATED = 1 << 0,
-};
+//enum skb_frame_desc_flags {
+// TEMPORARILY EMPTY
+//};
/**
* struct skb_frame_desc: Descriptor information for the skb buffer
@@ -325,6 +323,7 @@ enum queue_index {
* index corruption due to concurrency.
* @count: Number of frames handled in the queue.
* @limit: Maximum number of entries in the queue.
+ * @threshold: Minimum number of free entries before queue is kicked by force.
* @length: Number of frames in queue.
* @index: Index pointers to entry positions in the queue,
* use &enum queue_index to get a specific index field.
@@ -343,6 +342,7 @@ struct data_queue {
spinlock_t lock;
unsigned int count;
unsigned short limit;
+ unsigned short threshold;
unsigned short length;
unsigned short index[Q_INDEX_MAX];
@@ -467,6 +467,15 @@ static inline int rt2x00queue_available(struct data_queue *queue)
}
/**
+ * rt2x00queue_threshold - Check if the queue is below threshold
+ * @queue: Queue to check.
+ */
+static inline int rt2x00queue_threshold(struct data_queue *queue)
+{
+ return rt2x00queue_available(queue) < queue->threshold;
+}
+
+/**
* rt2x00_desc_read - Read a word from the hardware descriptor.
* @desc: Base descriptor address
* @word: Word index from where the descriptor should be read.
diff --git a/drivers/net/wireless/rt2x00/rt2x00usb.c b/drivers/net/wireless/rt2x00/rt2x00usb.c
index fdf505beb79..8cf6e3f253e 100644
--- a/drivers/net/wireless/rt2x00/rt2x00usb.c
+++ b/drivers/net/wireless/rt2x00/rt2x00usb.c
@@ -165,11 +165,11 @@ static void rt2x00usb_interrupt_txdone(struct urb *urb)
rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
/*
- * If the data queue was full before the txdone handler
- * we must make sure the packet queue in the mac80211 stack
+ * If the data queue was below the threshold before the txdone
+ * handler we must make sure the packet queue in the mac80211 stack
* is reenabled when the txdone handler has finished.
*/
- if (!rt2x00queue_full(entry->queue))
+ if (!rt2x00queue_threshold(entry->queue))
ieee80211_wake_queue(rt2x00dev->hw, qid);
}
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index aa9ef66921b..746f87c8e70 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -2375,7 +2375,6 @@ static int rt61pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
*/
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
skbdesc->data = skb->data;
skbdesc->data_len = skb->len;
skbdesc->desc = entry_priv->desc;
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index 5e5f6034383..ae50f6332df 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -1980,7 +1980,6 @@ static int rt73usb_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
*/
skbdesc = get_skb_frame_desc(skb);
memset(skbdesc, 0, sizeof(*skbdesc));
- skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
skbdesc->data = skb->data + intf->beacon->queue->desc_size;
skbdesc->data_len = skb->len - intf->beacon->queue->desc_size;
skbdesc->desc = skb->data;