Since card has 12 tx queues and we want to keep track of the interrupts
per queue we can't fit all these interrupt bits on a single register.
So we have 5 registers, the primary interrupt status register (PISR) and
the 4 secondary interupt status registers (SISRs).
In order to be able to read them all at once (atomic operation) Atheros
introduced the Read-And-Clear registers to make things easier. So when
reading RAC_PISR register, hw does a read on PISR and all SISRs, returns
the value of PISR, copies all SISR values to their shadow copies (RAC_SISRx)
and clears PISR and SISRs. This saves us from reading PISR/SISRs in a sequence.
So far we 've used this approach and MadWiFi/Windows driver etc also used it
for years.
It turns out this operation is not atomic after all (at least not on all cards)
That means it's possible to loose some interrupts because they came after the
copy step and hw cleared them on the clean step !
That's probably the reason we got missed beacons, got stuck queues etc and
couldn't figure out what was going on.
With this patch we switch from RaC operation to an alternative method (that
makes more sense IMHO anyway, I just chose to be on the safe side so far).
Instead of reading RAC registers, we read the normal PISR/SISR registers and
clear any bits we got by writing them back on the register. This will clear only
the bits we got on our read step and leave any new bits unaffected (at least
that's what docs say). So if any new interrupts come up we won't miss it.
I've tested this with an AR5213 and an AR2425 and it seems O.K.
Many thanks to Adrian Chadd for debuging this and reviewing the patch !
v2: Make sure we don't clear PISR bits that map to SISR generated interrupts
(added a comment on the code for this)
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
th5k_hw_setup_tx_queue() returns a valid offset into the ah->ah_txq[]
array. The ah->ah_txq[] and the ah->txqs[] array are the same size.
Both have AR5K_NUM_TX_QUEUES elements. So this error handling code
will never trigger.
Also it's wrong. The call to ath5k_hw_release_tx_queue() with a qnum
of AR5K_NUM_TX_QUEUES or more will just trigger a WARN_ON() and
return. Or if it missed the WARN_ON(), it would just corrupt some
memory and return.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This cleans up error handling for the beacon in case of dma mapping
failure. We need to free the skb when dma mapping fails instead of
nulling and leaking the pointer, and we should bail out to avoid
giving the hardware the bad descriptor.
Finally, we need to perform the null check after trying to update
the beacon, or else beacons will never be sent after a single
mapping failure.
Cc: stable@kernel.org
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Remove unnecessary includes from base.h. Add includes to other files as
necessary. Don't include base.h unless needed.
Move declarations for functions in base.c from ath5k.h to base.h.
Use a better named define to protect base.h against double inclusion.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
When checking for the band, use channel->band.
Change ath5k_hw_nic_wakeup() and ath5k_channel_ok() to take
ieee80211_channel. Change ath5k_hw_radio_revision() to take
ieee80211_band.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
struct ath5k_avg_val is unused.
In struct ath5k_hw, lladdr, ah_radar and ah_mac_revision are write-only,
rxbufsize is unused, ah_phy is write-only and referenced by unused
macros.
In struct ath5k_vif, lladdr is write-only.
Remove AR5K_TUNE_RADAR_ALERT, which has no effect.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Both ath5k_hw and ath5k_softc represent one instance of the hardware.
This duplication is historical and is not needed anymore.
Keep the name "ath5k_hw" for the merged structure and "ah" for the
variable pointing to it. "ath5k_hw" is shorter than "ath5k_softc", more
descriptive and more widely used.
Put the combined structure to ath5k.h where the old ath5k_softc used to
be. Move some code from base.h to ath5k.h as needed.
Remove memory allocation for struct ath5k_hw and the corresponding error
handling. Merge iobase and ah_iobase fields.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Instead of using ieee80211_stop_queue, check the configured tx queue
limit before calling ieee80211_get_buffered_bc.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
During scans the full calibration usually does not make much sense,
PAPD probing and IQ calibration should be deferred until there is
enough time to complete them. Adding 100 ms to the initial full
calibration delay should be enough to do this.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Fixes a division by zero when setting distance before activating the
device for the first time.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>
sc->imask may change if ath5k_set_current_imask() races against itself.
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Remove linux/mm.h inclusion from netdevice.h -- it's unused (I've checked manually).
To prevent mm.h inclusion via other channels also extract "enum dma_data_direction"
definition into separate header. This tiny piece is what gluing netdevice.h with mm.h
via "netdevice.h => dmaengine.h => dma-mapping.h => scatterlist.h => mm.h".
Removal of mm.h from scatterlist.h was tried and was found not feasible
on most archs, so the link was cutoff earlier.
Hope people are OK with tiny include file.
Note, that mm_types.h is still dragged in, but it is a separate story.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Nothing else is freeing it, and this mirrors the error handling path
already in ath5k_init_softc.
https://bugzilla.kernel.org/show_bug.cgi?id=37592
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Reported-by: Tsyvarev Andrey <tsyvarev@ispras.ru>
Move an extern variable declaration to a header file. Prefix all
functions with "ath5k_". Make ath5k_intr() static. Remove unneeded
forward declarations. Remove pointless "extern" in a function
declaration.
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Disable fast channel change by default on AR2413/AR5413 due to
some bug reports (it still works for me but it's better to be safe).
Add a module parameter "fastchanswitch" in case anyone wants to enable
it and play with it.
Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This was introduced in 2.6.39-rc1 it seems.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Sedat Dilek <sedat.dilek@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
On AHB, the calibration data usually does not contain a valid MAC address,
the correct MAC address is stored in the board config.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
While the rx/tx tasklet is pending, new unnecessary interrupts may arrive.
Decrease the load by temporarily disabling the interrupts until the tasklet
has completed.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
The pointers to the debugfs entries do not need to be saved, because they
will be recursively removed when the wiphy is unregistered.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Reusing the configured retry counts from the skb cb is more efficient than
reloading the data from uncached memory.
Replace ts_longretry (unused) with ts_final_retry which contains the retry
count for the final rate only
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
During normal operation, minstrel was showing suspicious EWMA probabilities
exceeding 100%. It looks like the tx status reporting in ath5k was not
properly clearing the rate index for rates which were never attempted.
This is caused by uninitialized stale data in the on-stack tx status
information, which is reused when more frames are received.
To fix this, rely on ts->ts_final_idx to select the last attempted rate,
instead of checking whether ts->ts_rate is set.
Additionally, the conversion from the driver rate index back to the
mac80211 rate index can be dropped, as the mac80211 tx status will still
have the original rate index which was used to set up the descriptor.
Additionally, one more inaccuracy was fixed - the final rate attempt
count only needs to be increased by one if the transmission attempt was
successful.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
It seems ath5k has issues receiving broadcast packets (ARPs) when
using multiple STA interfaces associated with multiple APs.
This patch ensures the NIC is always in PROMISC mode if there
are more than 1 stations associated.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
The return value of the tx operation is commonly
misused by drivers, leading to errors. All drivers
will drop frames if they fail to TX the frame, and
they must also properly manage the queues (if they
didn't, mac80211 would already warn).
Removing the ability for drivers to return a BUSY
value also allows significant cleanups of the TX
TX handling code in mac80211.
Note that this also fixes a bug in ath9k_htc, the
old "return -1" there was wrong.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Tested-by: Sedat Dilek <sedat.dilek@googlemail.com> [ath5k]
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com> [rt2x00]
Acked-by: Larry Finger <Larry.Finger@lwfinger.net> [b43, rtl8187, rtlwifi]
Acked-by: Luciano Coelho <coelho@ti.com> [wl12xx]
Signed-off-by: John W. Linville <linville@tuxdriver.com>
The flag isn't very descriptive -- the intention
is that the driver provides a TSF timestamp at
the beginning of the MPDU -- make that clearer
by renaming the flag to RX_FLAG_MACTIME_MPDU.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
The register definition for retry configuration on AR5212 was wrong, and simply
copied over from AR5210. Update the register definitions from the documentation.
Let the short and long retries be configured from mac80211 and use the standard
values of 7 and 4 by default. Also we need to make sure we don't export more
retries than we are configured for to mac80211 (and the rate module) in
hw->max_rate_tries.
Also clean up the code by removing unused defines and variables and drop the
different values for "station retries" - if these need to be different it can
be handled tru ah_retry_long/short.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This adds a few tracepoints to ath5k driver transmit and
receive callbacks in order to record packet traffic.
We record the entire packet in the trace buffer so that
the data can be extracted with trace-cmd and external
plugins.
Compared to the previous debugging calls, this approach
removes an out-of-line function call from the tx and rx
paths in the compiled-in-but-disabled case, while
improving the ability to process the logged data.
A new option, CONFIG_ATH5K_TRACER, is added so that one
may disable the tracepoints completely.
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Bruno Randolf <br1@einfach.org>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Remove useless test_bit - it's not going to happen because of the way this
function is called only when that bit is set.
And fix some whitespace.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Simplify confusing code and get rid of an unnecessary variable.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Remove sc->curband because the band is already stored in the current channel.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
sc->curmode is set but never used. Remove it and the helper function. Also the
ath5k_rate_update which is refered to in the comment does not exist (any more?)
so we don't need to setup the band in that place.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Add the 802.11j (20MHz channel width) channels to the allowed channels. This
still does not enable 802.11j in ath5k since these frequencies are out of the
configured range. A later patch will deal with that.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Rename ath5k_copy_channels() to ath5k_setup_channels() - nothing is copied
here.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Use mac80211 channel mapping function instead of own homegrown version.
Signed-off-by: Bruno Randolf <br1@einfach.org>
Acked-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
ath5k_reset must be called with sc->lock. Since the tx queue
watchdog runs in a workqueue and accesses sc, it's appropriate
to just take the lock over the whole function.
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Nick Kossifidis