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mac80211: introduce IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL

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commit 5b632fe85e upstream.

Commit f0425beda4 "mac80211: retry sending
failed BAR frames later instead of tearing down aggr" caused regression
on rt2x00 hardware (connection hangs). This regression was fixed by
commit be03d4a45c "rt2x00: Don't let
mac80211 send a BAR when an AMPDU subframe fails". But the latter
commit caused yet another problem reported in
https://bugzilla.kernel.org/show_bug.cgi?id=42828#c22

After long discussion in this thread:
http://mid.gmane.org/20121018075615.GA18212@redhat.com
and testing various alternative solutions, which failed on one or other
setup, we have no other good fix for the issues like just revert both
mentioned earlier commits.

To do not affect other hardware which benefit from commit
f0425beda4, instead of reverting it,
introduce flag that when used will restore mac80211 behaviour before
the commit.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
[replaced link with mid.gmane.org that has message-id]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
[hq: Backported to 3.4: adjust context]
Signed-off-by: Qiang Huang <h.huangqiang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stanislaw Gruszka 2012-12-03 12:56:33 +01:00 committed by Greg Kroah-Hartman
parent d6f6a6494d
commit 3a2c0d4b76
2 changed files with 10 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/net/mac80211.h
View file

@ -1174,6 +1174,10 @@ enum sta_notify_cmd {
* @IEEE80211_HW_SCAN_WHILE_IDLE: The device can do hw scan while
* being idle (i.e. mac80211 doesn't have to go idle-off during the
* the scan).
*
* @IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL: On this hardware TX BA session
* should be tear down once BAR frame will not be acked.
*
*/
enum ieee80211_hw_flags {
IEEE80211_HW_HAS_RATE_CONTROL = 1<<0,
@ -1201,6 +1205,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_AP_LINK_PS = 1<<22,
IEEE80211_HW_TX_AMPDU_SETUP_IN_HW = 1<<23,
IEEE80211_HW_SCAN_WHILE_IDLE = 1<<24,
IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL = 1<<26,
};
/**

6
net/mac80211/status.c
View file

@ -432,7 +432,11 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
ieee80211_set_bar_pending(sta, tid, ssn);
if (local->hw.flags &
IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL)
ieee80211_stop_tx_ba_session(&sta->sta, tid);
else
ieee80211_set_bar_pending(sta, tid, ssn);
}
}