From 142b9f5074dc0d09dc0025739ad437723d7bf527 Mon Sep 17 00:00:00 2001 From: Helmut Schaa Date: Thu, 23 Jul 2009 13:18:01 +0200 Subject: mac80211: implement basic background scanning 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 Signed-off-by: John W. Linville --- net/mac80211/rx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'net/mac80211/rx.c') diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 9c1679d124ba..cb95a3116034 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -421,7 +421,8 @@ ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) return ieee80211_scan_rx(rx->sdata, skb); - if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning))) { + if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && + (rx->flags & IEEE80211_RX_IN_SCAN))) { /* drop all the other packets during a software scan anyway */ if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) dev_kfree_skb(skb); @@ -2136,7 +2137,8 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, return; } - if (unlikely(local->scanning)) + if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || + test_bit(SCAN_OFF_CHANNEL, &local->scanning))) rx.flags |= IEEE80211_RX_IN_SCAN; ieee80211_parse_qos(&rx); -- cgit v1.2.1