Follow the rule of coding for the latest API. Use __skb_queue_after()
in the code rather than __skb_append(), which is due to be removed in
Linux 2.6.26. Provide compatibility definitions for __skb_queue_after()
in include/compat.h.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3605 0192ed92-7a03-0410-a25b-9323aeb14dbd
__skb_append() will be removed in Linux 2.6.26. __skb_queue_after()
should be used instead. Use the new interface on Linux 2.6.25 and
newer.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3602 0192ed92-7a03-0410-a25b-9323aeb14dbd
1) Move all debug preprocessor flags out into make files
2) Add support for remaining preprocessor flags to be set by ENV variables
3) Add support for HAL tracing to include device name
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3481 0192ed92-7a03-0410-a25b-9323aeb14dbd
Split skb and node debug flags - one ending in _ref tracks minute changes to reference counts, while the non _ref flag trackes more coarse grained debug events.
Fix a node reference leak before skb_orphan detected by the debug destructor.
Fix debug flag display order for athdebug and 80211debug so that the shorter
name comes first and matches, otherwise only the _ref flags match.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2964 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
we use skb->cb (will be in a subsequent commit/merge) should use
this macro. This is part of a larger batch of changes I am in the process
of merging that add better visibility into skbuff usage/leaks in the driver.
ieee80211_node_refcnt use atomic_read for consistency and because it is
the correct thing to do. atomic_read is a macro that expands to the same
thing in most architectures anyway.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@2887 0192ed92-7a03-0410-a25b-9323aeb14dbd
