linux_dsm_epyc7002/net/wireless
Kirill Tkhai f0b07bb151 net: Introduce net_rwsem to protect net_namespace_list
rtnl_lock() is used everywhere, and contention is very high.
When someone wants to iterate over alive net namespaces,
he/she has no a possibility to do that without exclusive lock.
But the exclusive rtnl_lock() in such places is overkill,
and it just increases the contention. Yes, there is already
for_each_net_rcu() in kernel, but it requires rcu_read_lock(),
and this can't be sleepable. Also, sometimes it may be need
really prevent net_namespace_list growth, so for_each_net_rcu()
is not fit there.

This patch introduces new rw_semaphore, which will be used
instead of rtnl_mutex to protect net_namespace_list. It is
sleepable and allows not-exclusive iterations over net
namespaces list. It allows to stop using rtnl_lock()
in several places (what is made in next patches) and makes
less the time, we keep rtnl_mutex. Here we just add new lock,
while the explanation of we can remove rtnl_lock() there are
in next patches.

Fine grained locks generally are better, then one big lock,
so let's do that with net_namespace_list, while the situation
allows that.

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-29 13:47:53 -04:00
..
certs cfg80211: ship certificates as hex files 2017-12-19 09:28:01 +01:00
.gitignore cfg80211: implement regdb signature checking 2017-10-11 14:24:24 +02:00
ap.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chan.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
core.c net: Drop pernet_operations::async 2018-03-27 13:18:09 -04:00
core.h mac80211_hwsim: validate number of different channels 2018-01-15 09:34:45 +01:00
debugfs.c cfg80211 debugfs: Cleanup some checkpatch issues 2017-02-08 09:15:59 +01:00
debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ethtool.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ibss.c cfg80211: IBSS: Add support for static WEP in driver for IBSS 2017-12-11 12:19:21 +01:00
Kconfig cfg80211: add missing dependency to CFG80211 suboptions 2018-02-27 10:54:12 +01:00
lib80211_crypt_ccmp.c lib80211: ratelimit key index mismatch 2015-12-04 14:43:32 +01:00
lib80211_crypt_tkip.c wireless: fix bogus maybe-uninitialized warning 2016-11-17 08:46:38 +02:00
lib80211_crypt_wep.c lib80211: Use skcipher and ahash 2016-01-27 20:36:03 +08:00
lib80211.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
Makefile cfg80211: ship certificates as hex files 2017-12-19 09:28:01 +01:00
mesh.c cfg80211: use only 1Mbps for basic rates in mesh 2018-01-31 12:38:56 +01:00
mlme.c cfg80211: cleanup signal strength units notation 2017-12-11 12:19:31 +01:00
nl80211.c Various updates across wireless. 2018-02-22 15:18:28 -05:00
nl80211.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
ocb.c cfg80211: ocb: Fix null pointer deref if join_ocb is unimplemented 2015-12-04 14:43:32 +01:00
of.c cfg80211: support ieee80211-freq-limit DT property 2017-01-06 14:01:13 +01:00
radiotap.c cfg80211: add radiotap VHT info to rtap_namespace_sizes 2016-02-24 09:04:41 +01:00
rdev-ops.h cfg80211/nl80211: Optional authentication offload to userspace 2018-01-31 12:56:52 +01:00
reg.c cfg80211: fully initialize old channel for event 2018-01-15 09:15:03 +01:00
reg.h cfg80211: implement regdb signature checking 2017-10-11 14:24:24 +02:00
scan.c cfg80211: Scan results to also report the per chain signal strength 2017-12-19 10:37:31 +01:00
sme.c cfg80211: clear wep keys after disconnection 2018-02-19 14:53:12 +01:00
sysfs.c cfg80211: check rdev resume callback only for registered wiphy 2017-03-29 09:11:29 +02:00
sysfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.c cfg80211: add tracing to rdev-ops 2012-10-18 10:53:37 +02:00
trace.h cfg80211/nl80211: Optional authentication offload to userspace 2018-01-31 12:56:52 +01:00
util.c mac80211: support A-MSDU in fast-rx 2018-02-27 13:30:53 +01:00
wext-compat.c cfg80211: fix station info handling bugs 2018-01-18 15:36:18 -05:00
wext-compat.h cfg80211-wext: export symbols only when needed 2015-02-28 21:31:09 +01:00
wext-core.c net: Introduce net_rwsem to protect net_namespace_list 2018-03-29 13:47:53 -04:00
wext-priv.c wext: fix potential private ioctl memory content leak 2010-09-20 13:41:40 -04:00
wext-proc.c net: Use octal not symbolic permissions 2018-03-26 12:07:48 -04:00
wext-sme.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wext-spy.c wireless: Convert compare_ether_addr to ether_addr_equal 2012-05-09 20:49:19 -04:00