* Tidy, including refactoring and variable rename for clarity and consistency
* Move some variable initialisation out of sysctl register where it does not belong.
* Only change antenna based on RX traffic if both diversity and an RX antenna is not set
* Set HW/HAL diversity setting on HW/HAL reset
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3717 0192ed92-7a03-0410-a25b-9323aeb14dbd
similar code was removed in r3503, but it was wrong before as well, because
the packet needs to be dropped instead of requeued to actually achieve
prioritization between different packet types (WME classes). if we allow
one queue to consume all TX buffers then there is no buffer left to service
packets on higher priority queues.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3648 0192ed92-7a03-0410-a25b-9323aeb14dbd
The register defines were taken from ath5k.
This patch has been only lightly tested, I'm afraid - trying for more coverage.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3641 0192ed92-7a03-0410-a25b-9323aeb14dbd
process discarded frames in ath_recv_mgmt(). this reduces the number of times
we attempt to merge IBSS to invalid beacons.
this patch is based on the work of Derek Smithies
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3634 0192ed92-7a03-0410-a25b-9323aeb14dbd
The last descriptor is now implicit in the structure and meta-data of the buffers; axq_link does not need to be maintained separately.
Add macros to to return the last buffer, descriptor, and link them as necessary.
Make the queue moving macro implicitly link descriptors, and remove the explicit descriptor linking in this case.
ath_node_move_data is still desperately in need of a review; it is used in XR.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3620 0192ed92-7a03-0410-a25b-9323aeb14dbd
The rx overruns should dissapear with the previous performance improvements and a little bit more runway here. The 100 more to tx should only help in cases where large numbers of small packets are set and you are going for maximum throughput. Even then, I haven't proven you will ever need this many tx buffers. I've also bumped the reserve pool for management frames from 5 to 20.
These settings tested well in the lab with multiple station links running bandwidth tests.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3521 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Only hold the RX queue lock while removing and while re-inserting a buffer -
allowing pre-emption to work properly while the tasklet is reaping and
recycling rx buffers.
* All skb and bus handling is managed in the ath_rxbuf_init function now.
* Do not stop processing when ath_rxbuf_init fails, because that means low
free skb but does NOT mean the queue is fully processed. Since we also keep
our skbuff except during a very brief period when we free one and reallocate
one - unless pre-emption or SMP steals it, chances are very good we can keep
processing the queue even under low memory conditions -- and avoid dreaded
rx overruns.
* Add missing locks around code blocks that iterate over rx buffer list in
flush/drain/init/cleanup/etc helper functions.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3519 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Replace an_halstats it with an_avgrssi (EWMA)
* Only update stats in ath_softc* when we are on-channel and acting as a station,
as there is no meaning to these stats as an AP.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3515 0192ed92-7a03-0410-a25b-9323aeb14dbd
this is what it does.
* Rename ATH_BUFSTATUS_DONE to ATH_BUFSTATUS_RXDESC_DONE since this is what
we mean - has the descriptor been processed.
* Eliminate a case where we were processing each descriptor twice and
double-counting the statistics.
* Delegate decision on whether to schedule the rx queue to
ath_intr_process_rx_descriptors so we do not schedule it when there is no work.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3514 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Beacon calibration interval needs to be per-radio, not global because
each radio is going to have it's IQ gain calibration reached at different
times. With multi-radio systems, you could have one radio calibrated and one
in sorry shape and the calibration interval would be dropped back to the
longer intervals for both. This also necessitated removal of the sysctl var
for "calibrate" since it was the wrong thing.
* Fix for jiffies rollover bugs - use macros and mod_timer calls rather than
hacking timer structures directly.
* Always process noise floor before retrieving it. That is to say, the process
noise floor call and the get channel noise call should always be one after the
other, owing to things like channel changes and scanning.
ath_hal_process_noisefloor(sc->sc_ah);
ic->ic_channoise = ath_hal_get_channel_noise(sc->sc_ah, &(sc->sc_curchan));
* Calculate noise floor and read noise level at more opportune times/places.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3513 0192ed92-7a03-0410-a25b-9323aeb14dbd
You can override:
- slottime
- ctstimeout
- acktimeout
acktimeout and ctstimeout will be selected from the first available of:
1) the explicitly specified override value [if present]
2) a value derived from an explicitly specified slottime [if present]
3) the HALs default behavior / standard settings for the PHY mode
Setting the distance is shorthand for updating the slottime, and both cts and ack timeout values based upon the usual equations for air propagation, speed of light, etc..etc..
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3508 0192ed92-7a03-0410-a25b-9323aeb14dbd
A module parameter and sysctl parameter are provided for changing whether interference mitigation is enabled or disabled.
When interference mitigation is disabled, we work around a HAL defect where the interference mitigation auto-tuning algorithm still starts and/or sets some initially high mitigation levels.
With this fix, disabling interference mitigation with the current HAL behaves like it did in prior HALs.
Far greater receive sensitivity and increased range is supported with this disabled. This is especially useful for long distance point-to-point links.
As a part of this fix, a severe bug that was originally a workaround for the HAL issue has been corrected. When interference mitigation is enabled, we NEVER want to eat or throttle the MIB interrupts as the hardware counter callbacks to the HAL are what drives the interference mitigation calibration state machine. Conversely, if interferference mitigation is being blocked by our driver but the hAL may still be enabling the HAL_INT_MIB in the IMR, then we want to force the interrupt OFF in the mask and eat the interrupt.
The failure case was where the interrupt would fire continually and never get properly handled because the HAL wasn't configured to handle interfernece mitigation - now we mask the interrupt OFF. With the 'throttling' hack, we didn't fix hte problem but made it worse - when interfernce mitigation was enabled we just blocked the necessary signals to get the counters updated and stop the interrupt from continuing to fire.
The timer to re-enable the MIB interrupt after it fired was also wrong cause it would make sure the interrupt could never be disabled by the HAL or the driver.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3505 0192ed92-7a03-0410-a25b-9323aeb14dbd
This pointer is entirely redundant with the pointer already in the SKB. This eliminates an unnecessary source of possible node reference leaks. In all cases this variable was being populated from the SKB's node pointer and was never referenced outside of the context of processing an skb, for obvious reasons.
Use BF_NI(bf) or SKB_NI(skb) macros to obtain the node of a buffer or skb.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3504 0192ed92-7a03-0410-a25b-9323aeb14dbd
We had a local flag that was being used inconsistently to mirror the queue state, but was really brain dead. sc_devstopped could be off even when the queue was stopped and no matter how many buffers were freed, we would never restart the queue. This could lead to liveness issues (mostly after a buffer leak caused excessive buffers to be used).
The kernel has an easy call to find out if the queue is stopped or not, so this checkin uses that.
We will re-awaken the queue if:
1) we have some buffers we are willing to use for data
2) the channel is available (as opposed to being in DFS CAC)
3) the queue is stopped
This is what we were originally going for with reap counters and sc_dev_stopped and all this other nonsense. The new logic is much simpler and cleaner.
This also fixes a performance problem where the queue was being re-awakened when no buffers were available resulting in a constant ping-pong of buffers between the kernel and madwifi and a very very heavy CPU utilization at exactly the wrong time.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3503 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Updated register dump based on ath5k database (refresh the list)
* Added a generic debug iwpriv delegation method to if_ath
* Added some functions to help diagnose lost ath_buf pointers
[resultant fixes will be checked in subsequent commits]
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3497 0192ed92-7a03-0410-a25b-9323aeb14dbd
This patch differs from the original in that beacon synchronised calibration is not condifured during CAC as no beacons are sent.
Thanks to nbd.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3358 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Based on patches from nbd
* av_beacon_alloc code has been reimplemented using atomic bit operations; I think this is safe for SMP
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3310 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Lots of coding style and formatting, tedious and annoying
* Quite a few bad merges as far as I can tell; at least one of which was serious - reintroduced a leak
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3202 0192ed92-7a03-0410-a25b-9323aeb14dbd
branch to trunk. especially notable is, that due to improved nexttbtt (next
"target beacon transmit time") calculation we will now get the correct backoff
behaviour for beacons, resulting in only one beacon per beacon interval (the
current head version will send N beacons for N stations in the beacon interval
because they are poorly synchronized). also because of the better timer
synchronization there is no more time lag of up to 1 minute until we see
beacons after a merge. thanks to benoit for figuring that out!
the difference between this patch and the version in the dfs-branch is that it
still uses self linked descriptors and uses the SWBA interrupt only for
updating the nexttbtt. this is necessary to recognize HW merges, for which we
don't get any notification by the hardware (see the thread "IBSS testing" on
this list for more details).
also i tried to clean up a bit, use a more descriptive function name for timer
updates (ath_beacon_update_timers instead of ath_beacon_config) and generally
better distingush between a HW merge and a SW merge.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3027 0192ed92-7a03-0410-a25b-9323aeb14dbd
Preprocessor flag now used to toggle printk output prior to blocking on
a spinlock.
There is of course a chance that the spinlock will be taken between the time we check it and print our little message, but this should still be of some assistance troubleshoot locking mistakes that come up in the future.
If you turn on the flag, you can find out what locks are being contended for and from which functions... i.e. ath_intr fights for a particular lock, etc.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2944 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Counters for total outstanding instances for each resource type (skb, ath_node and ath_buf)
* One pair of acquisition/release functions per resource type in unlocked and one in locked
* Adds some more _debug versions of functions in the call chain that acquire/release resources so that the original func/line in the driver as well as the func/line that affected the resource use can be shown in the trace. Intermediate stack frames aren't necessary to trace the leaks.
* Changes naming convention for "lock-required" functions to suffix _locked for the versions that expect locking, to be consistent with some other places in the code.
* Consolidate debug messages to the helper functions that actually affect the reference count or acquire/release a resource
* Additional sanity checks and leak detection (esp for detecting node ref leaks through skb)
* skb references are nulled out by the new sbk unref/free function.
I've tested these changes extensively and found lots of cases where we didn't get enough node references when cloning skbuff, and where the kernel drops packets due to performance issues and leaks our node references.
With these changes and the tracing enabled I have verified that:
* TX BUF: tx buffers always go down to zero when the tx queue is done, and you can watch tx queue usage ratio go up and down again as the driver is working. There are no leaks here at the moment, although there *are* some in the madwifi-dfs branch during CAC at the moment.
* skbuff leaks in all the common flows are fixed. We were leaking node references in a lot of places where kernel was dropping skb's due to congestion and we were failing to increment node references when cloning skbuffs. These are now detected, as are skbuffs that are reaped by the kernel while still holding a node reference.
* the ath_node count works correctly and on an idle system we get about 5 references per station table node, with 2 node instances per VAP. One for the bss and one for the node in the station table, I believe. The ath_node count goes up and down but always lands back at the stable number based on the vaps you have configured and the number of actual stations in the station table. The point here is that it's pretty constant what you will see over time, despite excessive node creation/release in our code during input (esp input_all). Thank god for the slab allocator.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2902 0192ed92-7a03-0410-a25b-9323aeb14dbd
