Here's my proposal how to implement beacon filtering in mac80211. The
basic idea is simple, the driver enables filtering whenever mac80211
enables power save and the driver calls ieee80211_beacon_loss()
whenever hardware informs about beacon loss.
I have tested this with stlc45xx (with beacon filtering) and iwl3945
(without beacon filtering) and based on simple tests this seems to
work. For reference I'll send the stlc45xx patch as a followup.
v4:
o remove hw parameter from ieee80211_beacon_loss()
o don't call the patchset RFC anymore
v3:
o rebase to 2.6.29-rc8-wl
o add cfg80211_hold_bss() and cfg80211_unhold_bss() to avoid loosing
the bss struct when beacon filter is enabled
o fix bug to use !IEEE80211_HW_PS_NULLFUNC_STACK both in
ieee80211_scan_ps_enable() and ieee80211_scan_ps_disable(), also
improve comments
o fix the indentation in ieee80211_associated(), not visible in patch
anymore:
mod_timer(&ifmgd->timer, jiffies +
- IEEE80211_MONITORING_INTERVAL);
+ IEEE80211_MONITORING_INTERVAL);
o add vif parameter to void ieee80211_beacon_loss()
o more documentation about filtering, and especially about
checksumming
o document why multicast check is needed in ieee80211_sta_rx_notify()
o beacon filter is only enabled when power save is enabled, take this
into account in ieee80211_associated()
v2:
o rebase to 2.6.29-rc7-wl
o rename ieee80211_rx_trigger() to ieee80211_sta_rx_notify()
o move check for sta mode in ieee80211_sta_rx_notify() to rx.c
o move unicast check from rx.c to ieee80211_sta_rx_notify()
o add comment for setting last_beacon in ieee80211_rx_mgmt_assoc_resp()
o rename IEEE80211_HW_BEACON_FILTERING to IEEE80211_HW_BEACON_FILTER
o send probe request from ieee80211_beacon_loss_work()
o API documentation
o enable beacon filtering only when power save is enabled
o disable power save (and hence beacon filtering) while scanning to make
it possible to have reliable scan results even when beacon filtering
is enabled
TODO:
(none)
For the future:
o configuration for beacon filter (beacon misses * beacon interval
should be constant?)
o don't run ieee80211_associated() in data idle period
---
Kalle Valo (5):
mac80211: add beacon filtering support
cfg80211: add feature to hold bss
mac80211: disable power save when scanning
mac80211: track beacons separately from the rx path activity
mac80211: decrease execution of the associated timer
Documentation/DocBook/mac80211.tmpl | 6 ++
include/net/cfg80211.h | 18 +++++
include/net/mac80211.h | 45 ++++++++++-
net/mac80211/ieee80211_i.h | 5 +
net/mac80211/iface.c | 3 +
net/mac80211/mlme.c | 139 +++++++++++++++++++++++++++--------
net/mac80211/rx.c | 9 ++
net/mac80211/scan.c | 64 ++++++++++++++++
net/wireless/core.h | 2 +
net/wireless/scan.c | 27 +++++++
10 files changed, 278 insertions(+), 40 deletions(-)
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