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Commit b9a785c7 authored by Michal Kazior's avatar Michal Kazior Committed by Rajeev Kumar Sirasanagandla
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mac80211: expose txq queue depth and size to drivers 



This will allow drivers to make more educated
decisions whether to defer transmission or not.

Relying on wake_tx_queue() call count implicitly
was not possible because it could be called
without queued frame count actually changing on
software tx aggregation start/stop code paths.

It was also not possible to know how long
byte-wise queue was without dequeueing.

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>

Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git


Git-commit: f2ac7e301ae6397669ff3f79e691942a9b5d2f39
CRs-Fixed: 1111521
Change-Id: I7b94a9ba2d68ce526a4421cc253829298d1a7620
Signed-off-by: default avatarRajeev Kumar Sirasanagandla <rsirasan@codeaurora.org>
parent 0236a032

include/net/mac80211.h

+15 −0
Original line number Diff line number Diff line
@@ -5467,4 +5467,19 @@ void ieee80211_unreserve_tid(struct ieee80211_sta *sta, u8 tid); 
 */

struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,

				     struct ieee80211_txq *txq);



/**

 * ieee80211_txq_get_depth - get pending frame/byte count of given txq

 *

 * The values are not guaranteed to be coherent with regard to each other, i.e.

 * txq state can change half-way of this function and the caller may end up

 * with "new" frame_cnt and "old" byte_cnt or vice-versa.

 *

 * @txq: pointer obtained from station or virtual interface

 * @frame_cnt: pointer to store frame count

 * @byte_cnt: pointer to store byte count

 */

void ieee80211_txq_get_depth(struct ieee80211_txq *txq,

			     unsigned long *frame_cnt,

			     unsigned long *byte_cnt);

#endif /* MAC80211_H */

net/mac80211/ieee80211_i.h

+1 −0
Original line number Diff line number Diff line
@@ -808,6 +808,7 @@ enum txq_info_flags { 
struct txq_info {

	struct sk_buff_head queue;

	unsigned long flags;

	unsigned long byte_cnt;



	/* keep last! */

	struct ieee80211_txq txq;

net/mac80211/iface.c

+1 −0
Original line number Diff line number Diff line
@@ -979,6 +979,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 


		spin_lock_bh(&txqi->queue.lock);

		ieee80211_purge_tx_queue(&local->hw, &txqi->queue);

		txqi->byte_cnt = 0;

		spin_unlock_bh(&txqi->queue.lock);



		atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);

net/mac80211/sta_info.c

+1 −0
Original line number Diff line number Diff line
@@ -115,6 +115,7 @@ static void __cleanup_single_sta(struct sta_info *sta) 


			ieee80211_purge_tx_queue(&local->hw, &txqi->queue);

			atomic_sub(n, &sdata->txqs_len[txqi->txq.ac]);

			txqi->byte_cnt = 0;

		}

	}

net/mac80211/tx.c

+7 −1
Original line number Diff line number Diff line
@@ -1266,7 +1266,11 @@ static void ieee80211_drv_tx(struct ieee80211_local *local, 
	if (atomic_read(&sdata->txqs_len[ac]) >= local->hw.txq_ac_max_pending)

		netif_stop_subqueue(sdata->dev, ac);



	skb_queue_tail(&txqi->queue, skb);

	spin_lock_bh(&txqi->queue.lock);

	txqi->byte_cnt += skb->len;

	__skb_queue_tail(&txqi->queue, skb);

	spin_unlock_bh(&txqi->queue.lock);



	drv_wake_tx_queue(local, txqi);



	return;
@@ -1294,6 +1298,8 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw, 
	if (!skb)

		goto out;



	txqi->byte_cnt -= skb->len;



	atomic_dec(&sdata->txqs_len[ac]);

	if (__netif_subqueue_stopped(sdata->dev, ac))

		ieee80211_propagate_queue_wake(local, sdata->vif.hw_queue[ac]);