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  1. 20 5月, 2014 1 次提交
    • R
      ath9k_hw: Abort transmission for sleeping station · 08232bf9
      由 Rajkumar Manoharan 提交于 
      The data transmission to the power save station should be aborted
immediately, whenever the station informs sleep state. Right now
the frames queued into into hardware are being transmitted until
the hardware detects the power save station based excessive retries
of the data frames due to unacknowlegdement. Then remaining frames
are returned with filetered status and might be retried later by
driver or mac80211.

Per WFA certification testing, AP should not send out more than two
frames after processing nullfunc with PM bit set from associated
station. To speed up tx filtering, the pending frames in hardware
queues for given station will be aborted immediately via tx filter
registers. This transmit filters can be ignored if the descriptor
is having invalid destination index or clear destination mask set.
Signed-off-by: NRajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      08232bf9
  3. 13 2月, 2014 1 次提交
  5. 19 12月, 2013 1 次提交
  7. 15 10月, 2013 1 次提交
  9. 16 8月, 2013 1 次提交
  11. 31 5月, 2013 2 次提交
  13. 11 4月, 2013 1 次提交
    • F
      ath9k: detect more kinds of invalid descriptors · 3747c3ee
      由 Felix Fietkau 提交于 
      If AR_CRCErr, AR_PHYErr, AR_DecryptCRCErr or AR_MichaelErr is indicated
in the rx status word, but AR_RxFrameOK is also set, the descriptor
contents are typically invalid. This can show up as a warning about
invalid MCS rates in a frame. Even with those checks in place, a
descriptor with invalid MCS rates can still sometimes make it through to
the driver (mostly on older hardware like AR91xx).

Detect such errors in the last descriptor of a frame and discard the
whole frame if present.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      3747c3ee
  15. 10 1月, 2013 1 次提交
    • S
      ath9k: add spectral scan feature · e93d083f
      由 Simon Wunderlich 提交于 
      Adds the spectral scan feature for ath9k. AR92xx and AR93xx chips
are supported for now. The spectral scan is triggered by configuring
a mode through a debugfs control file. Samples can be gathered via
another relay debugfs file.

Essentially, to try it out:

echo chanscan > /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan_ctl
iw dev wlan0 scan
cat /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan0 > samples
echo disable > /sys/kernel/debug/ieee80211/phy0/ath9k/spectral_scan_ctl

This feature is still experimental.

The special "chanscan" mode is used to perform spectral scan while
mac80211 is scanning for channels. To allow this,
sw_scan_start/complete() ops have been added.

The patch contains code snippets and information from Zefir Kurtisi and
information provided by Adrian Chadd and Felix Fietkau.
Signed-off-by: NSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: NMathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      e93d083f
  17. 11 8月, 2012 1 次提交
    • F
      ath9k: fix interrupt storms on queued hardware reset · f41a9b3b
      由 Felix Fietkau 提交于 
      commit b74713d0
"ath9k: Handle fatal interrupts properly" introduced a race condition, where
IRQs are being left enabled, however the irq handler returns IRQ_HANDLED
while the reset is still queued without addressing the IRQ cause.
This leads to an IRQ storm that prevents the system from even getting to
the reset code.

Fix this by disabling IRQs in the handler without touching intr_ref_cnt.

Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Cc: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      f41a9b3b
  19. 10 7月, 2012 1 次提交
  21. 16 3月, 2012 2 次提交
  23. 12 10月, 2011 3 次提交
  25. 20 9月, 2011 1 次提交
  27. 17 9月, 2011 3 次提交
  29. 31 8月, 2011 1 次提交
  31. 30 8月, 2011 1 次提交
  33. 25 8月, 2011 1 次提交
  35. 20 5月, 2011 1 次提交
  37. 20 4月, 2011 1 次提交
    • F
      ath9k: fix powersave frame filtering/buffering in AP mode · 5519541d
      由 Felix Fietkau 提交于 
      This patch fixes a long standing issue of pending packets in the queue being
sent (and retransmitted many times) to sleeping stations.
This was made worse by aggregation through driver-internal retransmitting
of A-MDPU subframes.
Previously the hardware tx filter was cleared unconditionally for every
single packet - with this patch it uses the IEEE80211_TX_CTL_CLEAR_PS_FILT
for unaggregated frames.
A sta_notify driver op is added to stop aggregation for stations when they
enter powersave mode. Subframes stay buffered inside the driver, to ensure
that the BlockAck window keeps a sane state.
Since the driver uses software aggregation, the clearing of the tx filter
needs to be handled by the driver instead of mac80211 for aggregated frames.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      5519541d
  39. 13 4月, 2011 1 次提交
    • F
      ath9k_hw: fix stopping rx DMA during resets · 5882da02
      由 Felix Fietkau 提交于 
      During PHY errors, the MAC can sometimes fail to enter an idle state on older
hardware (before AR9380) after an rx stop has been requested.

This typically shows up in the kernel log with messages like these:

ath: Could not stop RX, we could be confusing the DMA engine when we start RX up
------------[ cut here ]------------
WARNING: at drivers/net/wireless/ath/ath9k/recv.c:504 ath_stoprecv+0xcc/0xf0 [ath9k]()
Call Trace:
[<8023f0e8>] dump_stack+0x8/0x34
[<80075050>] warn_slowpath_common+0x78/0xa4
[<80075094>] warn_slowpath_null+0x18/0x24
[<80d66d60>] ath_stoprecv+0xcc/0xf0 [ath9k]
[<80d642cc>] ath_set_channel+0xbc/0x270 [ath9k]
[<80d65254>] ath_radio_disable+0x4a4/0x7fc [ath9k]

When this happens, the state that the MAC enters is easy to identify and
does not result in bogus DMA traffic, however to ensure a working state
after a channel change, the hardware should still be reset.

This patch adds detection for this specific MAC state, after which the above
warnings completely disappear in my tests.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Cc: Kyungwan Nam <Kyungwan.Nam@Atheros.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      5882da02
  41. 15 3月, 2011 2 次提交
    • F
      ath9k: improve reliability of beacon transmission and stuck beacon handling · efff395e
      由 Felix Fietkau 提交于 
      ath9k calls ath9k_hw_stoptxdma every time it sends a beacon, however there
is not much point in doing that if the previous beacon and mcast traffic
went out properly. On AR9380, calling that function too often can result
in an increase of stuck beacons due to differences in the handling of the
queue enable/disable functionality.

With this patch, the queue will only be explicitly stopped if the previous
data frames were not sent successfully. With the beacon code being the
only remaining user of ath9k_hw_stoptxdma, this function can be simplified
in order to remove the now pointless attempts at waiting for transmission
completion, which would never happen at this point due to the different
method of tx scheduling of the beacon queue.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      efff395e
    • F
      ath9k: fix stopping tx dma on reset · 0d51cccc
      由 Felix Fietkau 提交于 
      In some situations, stopping Tx DMA frequently fails, leading to messages
like this:

ath: Failed to stop TX DMA in 100 msec after killing last frame
ath: Failed to stop TX DMA!

This patch uses a few MAC features to abort DMA globally instead of iterating
over all hardware queues and attempting to stop them individually.
Not only is that faster and works with a shorter timeout, it also makes the
process much more reliable.

With this change, I can no longer trigger these messages on AR9380,
and on AR9280 they become much more rare.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      0d51cccc
  43. 29 1月, 2011 1 次提交
  45. 25 11月, 2010 1 次提交
  47. 10 11月, 2010 3 次提交
    • F
      ath9k_hw: optimize all descriptor access functions · ada9f1ca
      由 Felix Fietkau 提交于 
      Because all of the descriptor data structures are marked as __packed, GCC
assumes the worst case wrt. alignment and generates unaligned load/store
instructions on MIPS for access to all fields.
Since descriptors always have to be 4-byte-aligned, we can just mark the
data structures with __aligned(4), which allows GCC to generate much more
efficient code.
Verified through disassembly and OProfile comparisons.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      ada9f1ca
    • F
      ath9k_hw: optimize tx status descriptor processing · e0e9bc82
      由 Felix Fietkau 提交于 
      Disassembly shows, that at least on MIPS, the compiler generates a lot of
memory accesses to the same location in the descriptor field parsing.
Since it is operating on uncached memory, this can be quite expensive in
this hot path.
Change the code a bit to help the compiler optimize it properly, and get
rid of some unused fields in the ath_tx_status struct.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      e0e9bc82
    • F
      ath9k_hw: optimize interrupt mask changes · 4df3071e
      由 Felix Fietkau 提交于 
      OProfile showed that ath9k was spending way too much time in
ath9k_hw_set_interrupts. Since most of the interrupt mask changes only
need to globally enable/disable interrupts, it makes sense to split
this part into separate functions, replacing all calls to
ath9k_hw_set_interrupts(ah, 0) with ath9k_hw_disable_interrupts(ah).

ath9k_hw_set_interrupts(ah, ah->imask) only gets changed to
ath9k_hw_enable_interrupts(ah), whenever ah->imask was not changed
since the point where interrupts were disabled.
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      4df3071e
  49. 17 9月, 2010 1 次提交
  51. 13 7月, 2010 1 次提交
  53. 15 6月, 2010 2 次提交
  55. 20 4月, 2010 1 次提交
  57. 17 4月, 2010 2 次提交