* Convert last SKB_CB()->ni to SKB_NI
* Lots of comments
* Refactor various pieces of code for consistency, readability, and removal of goto
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3666 0192ed92-7a03-0410-a25b-9323aeb14dbd
This changeset adds a node statistic. If this is not liked, I encourage it to be fixed; I might learn something.
Thanks nbd.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3334 0192ed92-7a03-0410-a25b-9323aeb14dbd
hard_start_xmit() functions must either return NETDEV_TX_OK or
NETDEV_TX_BUSY (they might also return negative errno values as well,
like -ENETDOWN)
Correct a small missing static reported by sparse
This revert part of r3075
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3123 0192ed92-7a03-0410-a25b-9323aeb14dbd
* packets dropped in ath_hardstart are cleaned up there, so cleaning up in parent_queue_xmit is an error
* packets in ieee80211_pwrsave must always have a reference in the cb, so it is better that is fails noisily otherwise
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3074 0192ed92-7a03-0410-a25b-9323aeb14dbd
places where we could use vap->iv_bss->ni_bssid instead of ni->ni_bssid but i'm
not sure about the other ones.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3036 0192ed92-7a03-0410-a25b-9323aeb14dbd
beacons and management frames.
this includes benoits r2993 (from dfs branch) and the patch i sent to the list
for review a couple of days ago.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3002 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
* 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
