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mac80211: implement basic background scanning

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Introduce a new scan flag "SCAN_OFF_CHANNEL" which basically tells us
that we are currently on a different channel for scanning and cannot
RX/TX. "SCAN_SW_SCANNING" tells us that we are currently running a
software scan but we might as well be on the operating channel to RX/TX.
While "SCAN_SW_SCANNING" is set during the whole scan "SCAN_OFF_CHANNEL"
is set when leaving the operating channel and unset when coming back.

Introduce two new scan states "SCAN_LEAVE_OPER_CHANNEL" and
"SCAN_ENTER_OPER_CHANNEL" which basically implement the functionality we
need to leave the operating channel (send a nullfunc to the AP and stop
the queues) and enter it again (send a nullfunc to the AP and start the
queues again).

Enhance the scan state "SCAN_DECISION" to switch back to the operating
channel after each scanned channel. In the future it sould be simple
to enhance the decision state to scan as much channels in a row as the
qos latency allows us.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Helmut Schaa
2009-07-23 13:18:01 +02:00
committed by John W. Linville
parent fbe9c429f1
commit 142b9f5074
4 changed files with 148 additions and 13 deletions
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36
net/mac80211/ieee80211_i.h
View File

@@ -570,9 +570,41 @@ enum queue_stop_reason {
IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
};
/**
* mac80211 scan flags - currently active scan mode
*
* @SCAN_SW_SCANNING: We're currently in the process of scanning but may as
* well be on the operating channel
* @SCAN_HW_SCANNING: The hardware is scanning for us, we have no way to
* determine if we are on the operating channel or not
* @SCAN_OFF_CHANNEL: We're off our operating channel for scanning,
* gets only set in conjunction with SCAN_SW_SCANNING
*/
enum {
SCAN_SW_SCANNING,
SCAN_HW_SCANNING
SCAN_HW_SCANNING,
SCAN_OFF_CHANNEL,
};
/**
* enum mac80211_scan_state - scan state machine states
*
* @SCAN_DECISION: Main entry point to the scan state machine, this state
* determines if we should keep on scanning or switch back to the
* operating channel
* @SCAN_SET_CHANNEL: Set the next channel to be scanned
* @SCAN_SEND_PROBE: Send probe requests and wait for probe responses
* @SCAN_LEAVE_OPER_CHANNEL: Leave the operating channel, notify the AP
* about us leaving the channel and stop all associated STA interfaces
* @SCAN_ENTER_OPER_CHANNEL: Enter the operating channel again, notify the
* AP about us being back and restart all associated STA interfaces
*/
enum mac80211_scan_state {
SCAN_DECISION,
SCAN_SET_CHANNEL,
SCAN_SEND_PROBE,
SCAN_LEAVE_OPER_CHANNEL,
SCAN_ENTER_OPER_CHANNEL,
};
struct ieee80211_local {
@@ -683,7 +715,7 @@ struct ieee80211_local {
int scan_channel_idx;
int scan_ies_len;
enum { SCAN_DECISION, SCAN_SET_CHANNEL, SCAN_SEND_PROBE } scan_state;
enum mac80211_scan_state scan_state;
struct delayed_work scan_work;
struct ieee80211_sub_if_data *scan_sdata;
enum nl80211_channel_type oper_channel_type;