xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rt2x00: Improve TX status handling for BlockAckReq frames

Browse Source 
Since rt2800 hardware isn't capable of reporting the TX status of
BlockAckReq frames implement the TX status handling of BARs in
rt2x00lib. We keep track of all BARs that are send out and try to
match incoming BAs to the appropriate BARs. This allows us to report a
more or less accurate TX status for BAR frames which in turn improves
BA session stability.

This is loosley based on Christian Lamparter's patch for carl9170
"carl9170: fix HT peer BA session corruption".

We have to walk the list of pending BARs for every rx'red BA even
though most BAs don't belong to any of these BARs as they are just
acknowledging an AMPDU. To keep that overhead low use RCU which allows
us to walk the list of pending BARs without the need to acquire a lock.
This however requires us to _copy_ relevant information from the BAR
(RA, TA, control field, start sequence number) into our BAR list entry.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Tested-by: Andreas Hartmann <andihartmann@01019freenet.de>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Helmut Schaa
2013-01-17 17:34:32 +01:00
committed by John W. Linville
parent f49aabf816
commit 84e9e8ebd3
4 changed files with 169 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/wireless/rt2x00/rt2800lib.c
View File

@@ -1296,8 +1296,7 @@ void rt2800_config_filter(struct rt2x00_dev *rt2x00dev,
!(filter_flags & FIF_CONTROL));
rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_PSPOLL,
!(filter_flags & FIF_PSPOLL));
rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BA,
!(filter_flags & FIF_CONTROL));
rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BA, 0);
rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BAR,
!(filter_flags & FIF_CONTROL));
rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_CNTL,
@@ -5146,8 +5145,7 @@ static int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
IEEE80211_HW_SUPPORTS_PS |
IEEE80211_HW_PS_NULLFUNC_STACK |
IEEE80211_HW_AMPDU_AGGREGATION |
IEEE80211_HW_REPORTS_TX_ACK_STATUS |
IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL;
IEEE80211_HW_REPORTS_TX_ACK_STATUS;
/*
* Don't set IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING for USB devices