lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

mac80211: fix aggregation for hardware with ampdu queues

Browse Source 
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>
This commit is contained in:
Johannes Berg
2009-02-12 00:51:53 +01:00
committed by John W. Linville
parent f3734ee6df
commit 96f5e66e8a
10 changed files with 245 additions and 262 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/mac80211/wme.h
View File

@@ -21,11 +21,5 @@
extern const int ieee802_1d_to_ac[8];
u16 ieee80211_select_queue(struct net_device *dev, struct sk_buff *skb);
int ieee80211_ht_agg_queue_add(struct ieee80211_local *local,
struct sta_info *sta, u16 tid);
void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
struct sta_info *sta, u16 tid,
u8 requeue);
void ieee80211_requeue(struct ieee80211_local *local, int queue);
#endif /* _WME_H */