freebsd with flexible iflib nic queues
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Adrian Chadd 03475bd01a [net80211] remove node scan lock / generation number + fix few LORs
Drop scan generation number and node table scan lock - the only place
where ni_scangen is checked is in ieee80211_timeout_stations() (and it
is used to prevent duplicate checking of the same node); node scan lock
protects only this variable + node table scan generation number.

This will fix (at least) next LOR (hostap mode):

lock order reversal:
1st 0xc175f84c urtwm0_scan_loc (urtwm0_scan_loc) @ /usr/src/sys/modules/wlan/../../net80211/ieee80211_node.c:2019
2nd 0xc175e018 urtwm0_com_lock (urtwm0_com_lock) @ /usr/src/sys/modules/wlan/../../net80211/ieee80211_node.c:2693
stack backtrace:
#0 0xa070d1c5 at witness_debugger+0x75
#1 0xa070d0f6 at witness_checkorder+0xd46
#2 0xa0694cce at __mtx_lock_flags+0x9e
#3 0xb03ad9ef at ieee80211_node_leave+0x12f
#4 0xb03afd13 at ieee80211_timeout_stations+0x483
#5 0xb03aa1c2 at ieee80211_node_timeout+0x42
#6 0xa06c6fa1 at softclock_call_cc+0x1e1
#7 0xa06c7518 at softclock+0xc8
#8 0xa06789ae at intr_event_execute_handlers+0x8e
#9 0xa0678fa0 at ithread_loop+0x90
#10 0xa0675fbe at fork_exit+0x7e
#11 0xa08af910 at fork_trampoline+0x8

In addition to the above:

* switch to ieee80211_iterate_nodes();
* do not assert that node table lock is held, while calling node_age();
  that's not really needed (there are no resources, which can be protected
  by this lock) + this fixes LOR/deadlock between ieee80211_timeout_stations()
  and ieee80211_set_tim() (easy to reproduce in HOSTAP mode while
  sending something to an STA with enabled power management).

Tested:

* (avos) urtwn0, hostap mode
* (adrian) AR9380, STA mode
* (adrian) AR9380, AR9331, AR9580, hostap mode

Notes:

* This changes the net80211 internals, so you have to recompile all of it
  and the wifi drivers.

Submitted by:	avos
Approved by:	re (delphij)
Differential Revision:	https://reviews.freebsd.org/D6833
2016-06-19 07:31:02 +00:00
bin WITH_META_MODE: Fix bin/csh rebuilding tc.const.h 2016-06-14 16:19:49 +00:00
cddl Fix missing space in mandoc syntax 2016-06-01 06:18:34 +00:00
contrib Import ClangFormat.cpp from ^/vendor/clang/clang-release_380-r262564 2016-06-17 16:44:31 +00:00
crypto Add blacklist support to sshd 2016-06-07 16:18:09 +00:00
etc Commit the bits of nda that were missed. This should fix the build. 2016-06-10 06:04:53 +00:00
gnu WITH_META_MODE: Don't expect a .meta file for side-effect generated files. 2016-06-15 23:57:53 +00:00
include Commit the bits of nda that were missed. This should fix the build. 2016-06-10 06:04:53 +00:00
kerberos5 DIRDEPS_BUILD: Update dependencies 2016-06-14 16:55:05 +00:00
lib Add clang-format under WITH_CLANG_EXTRAS. 2016-06-17 16:46:58 +00:00
libexec DIRDEPS_BUILD: Update dependencies 2016-06-14 16:55:05 +00:00
release Note ipfilter support in blacklist-helper script in relnotes 2016-06-17 16:34:25 +00:00
rescue DIRDEPS_BUILD: Fix and hookup rescue/rescue to the build. 2016-05-26 23:20:40 +00:00
sbin pf: Filter on and set vlan PCP values 2016-06-17 18:21:55 +00:00
secure DIRDEPS_BUILD: Update dependencies 2016-06-14 16:55:05 +00:00
share - Prefer to use %d over %e where the day of the month should be zero 2016-06-19 03:44:32 +00:00
sys [net80211] remove node scan lock / generation number + fix few LORs 2016-06-19 07:31:02 +00:00
targets Add clang-format under WITH_CLANG_EXTRAS. 2016-06-17 16:46:58 +00:00
tests Always create loopback routes on every fib 2016-05-27 22:40:40 +00:00
tools - Prefer to use %d over %e where the day of the month should be zero 2016-06-19 03:44:32 +00:00
usr.bin mkimg: bump version to 20151211 after r292082 2016-06-17 18:49:42 +00:00
usr.sbin Add bsdconfig wifi' (aka wireless' or `wlan') module 2016-06-16 21:14:25 +00:00
.arcconfig Remove project.name which is a product of a bygone era. 2016-04-21 04:33:07 +00:00
.arclint
COPYRIGHT
LOCKS
MAINTAINERS Add myself to MAINTAINERS. 2016-03-14 16:27:43 +00:00
Makefile WITH_META_MODE: Whitelist 'make kernel' and 'make world'. 2016-06-15 23:58:06 +00:00
Makefile.inc1 Fix native powerpc64 build of lib32 with in-tree GCC. 2016-06-15 23:58:03 +00:00
Makefile.libcompat Fix native powerpc64 build of lib32 with in-tree GCC. 2016-06-15 23:58:03 +00:00
ObsoleteFiles.inc Replace _pam_verbose_error() with a macro. This was the last difference 2016-06-08 11:47:19 +00:00
README README: remove nonexistent 'games' directory. 2016-05-18 10:43:13 +00:00
UPDATING Fix typo from r300880 2016-05-27 22:44:33 +00:00

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