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8d1f7ecd2a
linux_dsm_epyc7002/net/mac80211
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Johannes Berg 8d1f7ecd2a mac80211: defer tailroom counter manipulation when roaming 
During roaming, the crypto_tx_tailroom_needed_cnt counter
will often take values 2,1,0,1,2 because first keys are
removed and then new keys are added. This is inefficient
because during the 0->1 transition, synchronize_net must
be called to avoid packet races, although typically no
packets would be flowing during that time.

To avoid that, defer the decrement (2->1, 1->0) when keys
are removed (by half a second). This means the counter
will really have the values 2,2,2,3,4 ... 2, thus never
reaching 0 and having to do the 0->1 transition.

Note that this patch entirely disregards the drivers for
which this optimisation was done to start with, for them
the key removal itself will be expensive because it has
to synchronize_net() after the counter is incremented to
remove the key from HW crypto. For them the sequence will
look like this: 0,1,0,1,0,1,0,1,0 (*) which is clearly a
lot more inefficient. This could be addressed separately,
during key removal the 0->1->0 sequence isn't necessary.

(*) it starts at 0 because HW crypto is on, then goes to
    1 when HW crypto is disabled for a key, then back to
    0 because the key is deleted; this happens for both
    keys in the example. When new keys are added, it goes
    to 1 first because they're added in software; when a
    key is moved to hardware it goes back to 0

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2013-03-06 16:36:00 +01:00
..
aes_ccm.c mac80211: use AES_BLOCK_SIZE 2011-07-08 11:11:24 -04:00
aes_ccm.h mac80211: use AES_BLOCK_SIZE 2011-07-08 11:11:24 -04:00
aes_cmac.c mac80211: include export.h in aes_cmac 2012-11-07 18:01:54 +01:00
aes_cmac.h mac80211: fix CMAC races 2011-07-08 11:11:20 -04:00
agg-rx.c mac80211: improve aggregation debug messages 2013-01-18 21:55:15 +01:00
agg-tx.c mac80211: fix aggregation state with current drivers 2013-01-24 15:43:51 +01:00
cfg.c mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
cfg.h
chan.c mac80211: add ieee80211_vif_change_bandwidth 2013-02-15 09:41:36 +01:00
debug.h mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
debugfs_key.c mac80211: add debug file for mic failure 2012-12-05 09:44:41 +01:00
debugfs_key.h mac80211: support separate default keys 2010-12-13 15:23:29 -05:00
debugfs_netdev.c mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
debugfs_netdev.h mac80211: reduce reliance on netdev 2009-12-21 18:38:52 -05:00
debugfs_sta.c mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
debugfs_sta.h
debugfs.c mac80211: remove IEEE80211_HW_SCAN_WHILE_IDLE 2013-02-11 18:45:01 +01:00
debugfs.h mac80211: use __printf attribute in debugfs 2012-10-18 09:01:57 +02:00
driver-ops.h mac80211: Allow drivers to differentiate between ROC types 2013-03-06 16:35:49 +01:00
event.c cfg80211: use proper allocation flags 2009-07-10 15:01:49 -04:00
ht.c mac80211: stop modifying HT SMPS capability 2013-02-15 09:41:41 +01:00
ibss.c mac80211: cleanup suspend/resume on ibss mode 2013-03-06 16:35:57 +01:00
ieee80211_i.h mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
iface.c mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
Kconfig Driver core patches for 3.9-rc1 2013-02-21 12:05:51 -08:00
key.c mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
key.h mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
led.c leds: Rename led_brightness_set() to led_set_brightness() 2012-07-24 07:52:34 +08:00
led.h mac80211: selective throughput LED trigger active 2010-12-22 14:33:37 -05:00
main.c mac80211: remove napi 2013-03-06 16:35:54 +01:00
Makefile mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
mesh_hwmp.c mac80211: clean up mesh code 2013-02-15 15:46:37 +01:00
mesh_pathtbl.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
mesh_plink.c mac80211: cleanup suspend/resume on mesh mode 2013-03-06 16:35:58 +01:00
mesh_ps.c mac80211: consolidate MBSS change notification 2013-02-15 09:41:09 +01:00
mesh_sync.c mac80211: clean up mesh code 2013-02-15 15:46:37 +01:00
mesh.c mac80211: cleanup suspend/resume on mesh mode 2013-03-06 16:35:58 +01:00
mesh.h mac80211: cleanup suspend/resume on mesh mode 2013-03-06 16:35:58 +01:00
michael.c
michael.h
mlme.c mac80211: cleanup suspend/resume on managed mode 2013-03-06 16:35:56 +01:00
offchannel.c mac80211: Allow drivers to differentiate between ROC types 2013-03-06 16:35:49 +01:00
pm.c mac80211: cleanup generic suspend/resume procedures 2013-03-06 16:35:56 +01:00
rate.c mac80211: convert to channel definition struct 2012-11-26 12:42:59 +01:00
rate.h mac80211: track number of spatial streams 2013-02-15 09:41:31 +01:00
rc80211_minstrel_debugfs.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
rc80211_minstrel_ht_debugfs.c mac80211/minstrel_ht: add support for using CCK rates 2013-02-13 10:56:33 +01:00
rc80211_minstrel_ht.c mac80211/minstrel_ht: fix spacing between sample attempts 2013-03-06 16:35:54 +01:00
rc80211_minstrel_ht.h mac80211/minstrel_ht: increase sampling frequency of some slower rates 2013-03-06 16:35:53 +01:00
rc80211_minstrel.c mac80211/minstrel_ht: add support for using CCK rates 2013-02-13 10:56:33 +01:00
rc80211_minstrel.h mac80211/minstrel_ht: add support for using CCK rates 2013-02-13 10:56:33 +01:00
rc80211_pid_algo.c net: fix assignment of 0/1 to bool variables. 2011-12-19 22:27:29 -05:00
rc80211_pid_debugfs.c net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules 2011-10-31 19:30:30 -04:00
rc80211_pid.h Fix common misspellings 2011-03-31 11:26:23 -03:00
rx.c wireless: move sequence number arithmetic to ieee80211.h 2013-03-06 16:35:44 +01:00
scan.c mac80211: add radar detection command/event 2013-02-15 09:41:04 +01:00
spectmgmt.c mac80211: Remove unnecessary OOM logging messages 2011-09-13 15:45:02 -04:00
sta_info.c mac80211: defer tailroom counter manipulation when roaming 2013-03-06 16:36:00 +01:00
sta_info.h mac80211: cleanup suspend/resume on mesh mode 2013-03-06 16:35:58 +01:00
status.c mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
tkip.c mac80211: use spin_lock_bh() for TKIP lock 2013-02-15 09:41:13 +01:00
tkip.h mac80211: fix TKIP races, make API easier to use 2011-07-08 11:11:19 -04:00
trace.c mac80211: trace debug messages 2012-06-24 11:33:18 +02:00
trace.h mac80211: Allow drivers to differentiate between ROC types 2013-03-06 16:35:49 +01:00
tx.c Merge remote-tracking branch 'mac80211/master' into HEAD 2013-03-06 16:33:12 +01:00
util.c mac80211: merge reconfig assign chanctx code 2013-03-06 16:35:58 +01:00
vht.c mac80211: support VHT capability overrides 2013-03-06 16:35:48 +01:00
wep.c mac80211: fix network header location when adding encryption headers 2012-05-16 12:47:43 -04:00
wep.h mac80211: move RX WEP weak IV counting 2012-03-13 14:54:16 -04:00
wme.c mac80211: mesh power save basics 2013-02-04 18:57:47 +01:00
wme.h mac80211: save wmm_acm per sdata 2012-06-20 17:35:22 +02:00
wpa.c mac80211: use spin_lock_bh() for TKIP lock 2013-02-15 09:41:13 +01:00
wpa.h mac80211: fix tx->skb NULL pointer dereference 2012-01-16 15:01:16 -05:00