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authorJohannes Berg <johannes@sipsolutions.net>2009-02-12 00:51:53 +0100
committerJohn W. Linville <linville@tuxdriver.com>2009-02-27 14:51:42 -0500
commit96f5e66e8a79810e2982cdcfa28e554f3d97da21 (patch)
treed16a0e083b83ab488f20b995c56a496a4ec2c9c8 /net/mac80211/sta_info.c
parentf3734ee6df3ac57151e02d091f47d5e52e646539 (diff)
downloadop-kernel-dev-96f5e66e8a79810e2982cdcfa28e554f3d97da21.zip
op-kernel-dev-96f5e66e8a79810e2982cdcfa28e554f3d97da21.tar.gz
mac80211: fix aggregation for hardware with ampdu queues
Hardware with AMPDU queues currently has broken aggregation. This patch fixes it by making all A-MPDUs go over the regular AC queues, but keeping track of the hardware queues in mac80211. As a first rough version, it actually stops the AC queue for extended periods of time, which can be removed by adding buffering internal to mac80211, but is currently not a huge problem because people rarely use multiple TIDs that are in the same AC (and iwlwifi currently doesn't operate as AP). This is a short-term fix, my current medium-term plan, which I hope to execute soon as well, but am not sure can finish before .30, looks like this: 1) rework the internal queuing layer in mac80211 that we use for fragments if the driver stopped queue in the middle of a fragmented frame to be able to queue more frames at once (rather than just a single frame with its fragments) 2) instead of stopping the entire AC queue, queue up the frames in a per-station/per-TID queue during aggregation session initiation, when the session has come up take all those frames and put them onto the queue from 1) 3) push the ampdu queue layer abstraction this patch introduces in mac80211 into the driver, and remove the virtual queue stuff from mac80211 again This plan will probably also affect ath9k in that mac80211 queues the frames instead of passing them down, even when there are no ampdu queues. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r--net/mac80211/sta_info.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 634f65c..4ba3c54 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -202,6 +202,18 @@ void sta_info_destroy(struct sta_info *sta)
/* Make sure timer won't free the tid_rx struct, see below */
if (tid_rx)
tid_rx->shutdown = true;
+
+ /*
+ * The stop callback cannot find this station any more, but
+ * it didn't complete its work -- start the queue if necessary
+ */
+ if (sta->ampdu_mlme.tid_state_tx[i] & HT_AGG_STATE_INITIATOR_MSK &&
+ sta->ampdu_mlme.tid_state_tx[i] & HT_AGG_STATE_REQ_STOP_BA_MSK &&
+ local->hw.ampdu_queues)
+ ieee80211_wake_queue_by_reason(&local->hw,
+ local->hw.queues + sta->tid_to_tx_q[i],
+ IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
+
spin_unlock_bh(&sta->lock);
/*
@@ -275,8 +287,7 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
* enable session_timer's data differentiation. refer to
* sta_rx_agg_session_timer_expired for useage */
sta->timer_to_tid[i] = i;
- /* tid to tx queue: initialize according to HW (0 is valid) */
- sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
+ sta->tid_to_tx_q[i] = -1;
/* rx */
sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
sta->ampdu_mlme.tid_rx[i] = NULL;
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