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cfg80211: Make pre-CAC results valid only for ETSI domain

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DFS requirement for ETSI domain (section 4.7.1.4 in
ETSI EN 301 893 V1.8.1) is the only one which explicitly
states that once DFS channel is marked as available afer
the CAC, this channel will remain in available state even
moving to a different operating channel. But the same is
not explicitly stated in FCC DFS requirement. Also, Pre-CAC
requriements are not explicitly mentioned in FCC requirement.
Current implementation in keeping DFS channel in available
state is same as described in ETSI domain.

For non-ETSI DFS domain, this patch gives a grace period of 2 seconds
since the completion of successful CAC before moving the channel's
DFS state to 'usable' from 'available' state. The same grace period
is checked against the channel's dfs_state_entered timestamp while
deciding if a DFS channel is available for operation. There is a new
radar event, NL80211_RADAR_PRE_CAC_EXPIRED, reported when DFS channel
is moved from available to usable state after the grace period. Also
make sure the DFS channel state is reset to usable once the beaconing
operation on that channel is brought down (like stop_ap, leave_ibss
and leave_mesh) in non-ETSI domain.

Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@qti.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Vasanthakumar Thiagarajan
2017-02-27 17:04:33 +05:30
committed by Johannes Berg
parent 7f813ce1bd
commit b35a51c7dd
9 changed files with 196 additions and 9 deletions
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5
include/uapi/linux/nl80211.h
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@@ -4913,12 +4913,17 @@ enum nl80211_smps_mode {
* change to the channel status.
* @NL80211_RADAR_NOP_FINISHED: The Non-Occupancy Period for this channel is
* over, channel becomes usable.
* @NL80211_RADAR_PRE_CAC_EXPIRED: Channel Availability Check done on this
* non-operating channel is expired and no longer valid. New CAC must
* be done on this channel before starting the operation. This is not
* applicable for ETSI dfs domain where pre-CAC is valid for ever.
*/
enum nl80211_radar_event {
NL80211_RADAR_DETECTED,
NL80211_RADAR_CAC_FINISHED,
NL80211_RADAR_CAC_ABORTED,
NL80211_RADAR_NOP_FINISHED,
NL80211_RADAR_PRE_CAC_EXPIRED,
};
/**