* 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
catch messages that occur during VAP startup (before you can possibly invoke
80211debug).
Support for shared debug flags where they take effect across all devices
(i.e. shared flags in athdebug), and when they take effect across all VAPs
(i.e. shared flags in 80211debug).
Some additional debugging flags, including some in preparation for more leak
detection code to be merged shortly as well as some from madwifi-dfs.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2888 0192ed92-7a03-0410-a25b-9323aeb14dbd
* Enhance readability of some functions WRT node referencing by putting blocks around areas where node references are held
* Various bits of consistency of the usage of node references; always unreference them at the point at which they are no longer used. Don't reuse variables implicitly.
* Significant overhaul of the usage of bf_node and ieee80211_cb.ni. Always hold a reference with aforementioned variable and always unreference it properly.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2839 0192ed92-7a03-0410-a25b-9323aeb14dbd
Linux 2.6.24 introduces a sysctl checker that disallows using arbitrary
ctl_name values for sysctl entries. The entries with non-standard
values should set ctl_name to CTL_UNNUMBERED.
On the other hand, using consistent non-zero ctl_name values is required
for older kernels (tested on Linux 2.4.33.3 from Slackware 11).
Thus the solution is to use CTL_UNNUMBERED on Linux 2.6.24+ and the
original values in the older kernels. Move CTL_AUTO and DEV_ATH to
include/compat.h and define them correspondingly.
When copying sysctl entries, check procname for being non-zero, since
ctl_name is zero (CTL_UNNUMBERED) on Linux 2.6.24 and newer.
For the same reason, don't use ctl_name to distinguish entries in
ath_sysctl_template, use extra2 instead.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2814 0192ed92-7a03-0410-a25b-9323aeb14dbd
Linux 2.6.24 has a sysctl table checker that rejects the tables
presented by the driver. Make the code survive this condition. Free
devname (or dev_name) before freeing the table. Don't do it at the
unregister time, it's too late.
The sysctl tables still need to be fixed.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2795 0192ed92-7a03-0410-a25b-9323aeb14dbd
SET_MODULE_OWNER() is not defined in 2.6.24, but it's already a no-op in
2.6.23. Make sure that it will be a no-op in 2.6.23 and newer kernels.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2754 0192ed92-7a03-0410-a25b-9323aeb14dbd
This value is roughly around the value that other devices are setting. The previous value appeared to be stupidly high.
This may solve some interactivity problems and machine performance issues.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2732 0192ed92-7a03-0410-a25b-9323aeb14dbd
