From patchwork Thu Jan 27 21:23:21 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Greear X-Patchwork-Id: 513231 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0RLNSs7030516 for ; Thu, 27 Jan 2011 21:23:29 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753317Ab1A0VX1 (ORCPT ); Thu, 27 Jan 2011 16:23:27 -0500 Received: from mail.candelatech.com ([208.74.158.172]:57757 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752763Ab1A0VX0 (ORCPT ); Thu, 27 Jan 2011 16:23:26 -0500 Received: from localhost.localdomain (firewall.candelatech.com [70.89.124.249]) by ns3.lanforge.com (8.14.2/8.14.2) with ESMTP id p0RLNNRh017672 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 27 Jan 2011 13:23:23 -0800 From: greearb@candelatech.com To: linux-wireless@vger.kernel.org Cc: Ben Greear Subject: [RFC v4] mac80211: Optimize scans on current operating channel. Date: Thu, 27 Jan 2011 13:23:21 -0800 Message-Id: <1296163401-9274-1-git-send-email-greearb@candelatech.com> X-Mailer: git-send-email 1.7.2.3 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 27 Jan 2011 21:23:29 +0000 (UTC) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index c47d7c0..50ceb67 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -654,8 +654,6 @@ struct tpt_led_trigger { * 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 * @SCAN_COMPLETED: Set for our scan work function when the driver reported * that the scan completed. * @SCAN_ABORTED: Set for our scan work function when the driver reported @@ -664,7 +662,6 @@ struct tpt_led_trigger { enum { SCAN_SW_SCANNING, SCAN_HW_SCANNING, - SCAN_OFF_CHANNEL, SCAN_COMPLETED, SCAN_ABORTED, }; @@ -1147,8 +1144,14 @@ void ieee80211_rx_bss_put(struct ieee80211_local *local, struct ieee80211_bss *bss); /* off-channel helpers */ -void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local); -void ieee80211_offchannel_stop_station(struct ieee80211_local *local); +/** + * Returns true if we are logically configured to be on + * the operating channel AND the hardware-conf is currently + * configured on the operating channel. Compares channel-type + * as well. + */ +bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local); +void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local); void ieee80211_offchannel_return(struct ieee80211_local *local, bool enable_beaconing); void ieee80211_hw_roc_setup(struct ieee80211_local *local); diff --git a/net/mac80211/main.c b/net/mac80211/main.c index 09a2744..6684b9e 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -98,6 +98,39 @@ static void ieee80211_reconfig_filter(struct work_struct *work) ieee80211_configure_filter(local); } +/* Return true if we are logically configured to be on + * the operating channel AND the hardware-conf is currently + * configured on the operating channel. + */ +bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local) +{ + struct ieee80211_channel *chan, *scan_chan; + enum nl80211_channel_type channel_type; + + /* This logic needs to match logic in ieee80211_hw_config */ + if (local->scan_channel) { + chan = local->scan_channel; + channel_type = NL80211_CHAN_NO_HT; + } else if (local->tmp_channel) { + chan = scan_chan = local->tmp_channel; + channel_type = local->tmp_channel_type; + } else { + chan = local->oper_channel; + channel_type = local->_oper_channel_type; + } + + if (chan != local->oper_channel || + channel_type != local->_oper_channel_type) + return false; + + /* Check current hardware-config against oper_channel. */ + if ((local->oper_channel != local->hw.conf.channel) || + (local->_oper_channel_type != local->hw.conf.channel_type)) + return false; + + return true; +} + int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) { struct ieee80211_channel *chan, *scan_chan; @@ -110,21 +143,27 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed) scan_chan = local->scan_channel; + /* If this off-channel logic ever changes, ieee80211_on_oper_channel + * may need to change as well. + */ offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; if (scan_chan) { chan = scan_chan; channel_type = NL80211_CHAN_NO_HT; - local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; - } else if (local->tmp_channel && - local->oper_channel != local->tmp_channel) { + } else if (local->tmp_channel) { chan = scan_chan = local->tmp_channel; channel_type = local->tmp_channel_type; - local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; } else { chan = local->oper_channel; channel_type = local->_oper_channel_type; - local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; } + + if (chan != local->oper_channel || + channel_type != local->_oper_channel_type) + local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL; + else + local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL; + offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL; if (offchannel_flag || chan != local->hw.conf.channel || @@ -231,7 +270,7 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, if (changed & BSS_CHANGED_BEACON_ENABLED) { if (local->quiescing || !ieee80211_sdata_running(sdata) || - test_bit(SCAN_SW_SCANNING, &local->scanning)) { + test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) { sdata->vif.bss_conf.enable_beacon = false; } else { /* diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c index b4e5267..5400da6 100644 --- a/net/mac80211/offchannel.c +++ b/net/mac80211/offchannel.c @@ -95,55 +95,33 @@ static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) ieee80211_sta_reset_conn_monitor(sdata); } -void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local) +void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local) { struct ieee80211_sub_if_data *sdata; + /* + * notify the AP about us leaving the channel and stop all + * STA interfaces. + */ mutex_lock(&local->iflist_mtx); list_for_each_entry(sdata, &local->interfaces, list) { if (!ieee80211_sdata_running(sdata)) continue; - /* disable beaconing */ + if (sdata->vif.type != NL80211_IFTYPE_MONITOR) + set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); + + /* Check to see if we should disable beaconing. */ if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_ADHOC || sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ieee80211_bss_info_change_notify( sdata, BSS_CHANGED_BEACON_ENABLED); - /* - * only handle non-STA interfaces here, STA interfaces - * are handled in ieee80211_offchannel_stop_station(), - * e.g., from the background scan state machine. - * - * In addition, do not stop monitor interface to allow it to be - * used from user space controlled off-channel operations. - */ - if (sdata->vif.type != NL80211_IFTYPE_STATION && - sdata->vif.type != NL80211_IFTYPE_MONITOR) { - set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); - netif_tx_stop_all_queues(sdata->dev); - } - } - mutex_unlock(&local->iflist_mtx); -} - -void ieee80211_offchannel_stop_station(struct ieee80211_local *local) -{ - struct ieee80211_sub_if_data *sdata; - - /* - * notify the AP about us leaving the channel and stop all STA interfaces - */ - mutex_lock(&local->iflist_mtx); - list_for_each_entry(sdata, &local->interfaces, list) { - if (!ieee80211_sdata_running(sdata)) - continue; - - if (sdata->vif.type == NL80211_IFTYPE_STATION) { - set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); + if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { netif_tx_stop_all_queues(sdata->dev); - if (sdata->u.mgd.associated) + if ((sdata->vif.type == NL80211_IFTYPE_STATION) && + sdata->u.mgd.associated) ieee80211_offchannel_ps_enable(sdata); } } @@ -181,7 +159,7 @@ void ieee80211_offchannel_return(struct ieee80211_local *local, netif_tx_wake_all_queues(sdata->dev); } - /* re-enable beaconing */ + /* Check to see if we should re-enable beaconing */ if (enable_beaconing && (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_ADHOC || diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index f36d70f..fa8e5ec 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -392,16 +392,10 @@ ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) if (likely(!(status->rx_flags & IEEE80211_RX_IN_SCAN))) return RX_CONTINUE; - if (test_bit(SCAN_HW_SCANNING, &local->scanning)) + if (test_bit(SCAN_HW_SCANNING, &local->scanning) || + test_bit(SCAN_SW_SCANNING, &local->scanning)) return ieee80211_scan_rx(rx->sdata, skb); - if (test_bit(SCAN_SW_SCANNING, &local->scanning)) { - /* drop all the other packets during a software scan anyway */ - if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) - dev_kfree_skb(skb); - return RX_QUEUED; - } - /* scanning finished during invoking of handlers */ I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); return RX_DROP_UNUSABLE; @@ -2749,7 +2743,7 @@ static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, local->dot11ReceivedFragmentCount++; if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || - test_bit(SCAN_OFF_CHANNEL, &local->scanning))) + test_bit(SCAN_SW_SCANNING, &local->scanning))) status->rx_flags |= IEEE80211_RX_IN_SCAN; if (ieee80211_is_mgmt(fc)) diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c index f246d8a..af02a60 100644 --- a/net/mac80211/scan.c +++ b/net/mac80211/scan.c @@ -293,12 +293,20 @@ static void __ieee80211_scan_completed_finish(struct ieee80211_hw *hw, bool was_hw_scan) { struct ieee80211_local *local = hw_to_local(hw); + bool ooc = ieee80211_cfg_on_oper_channel(local); + + if (was_hw_scan || !ooc) + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); - ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); if (!was_hw_scan) { + bool ooc2; ieee80211_configure_filter(local); drv_sw_scan_complete(local); - ieee80211_offchannel_return(local, true); + ooc2 = ieee80211_cfg_on_oper_channel(local); + /* We should always be on-channel at this point. */ + WARN_ON_ONCE(!ooc2); + if (ooc2 && (ooc != ooc2)) + ieee80211_offchannel_return(local, true); } mutex_lock(&local->mtx); @@ -398,14 +406,10 @@ static int ieee80211_start_sw_scan(struct ieee80211_local *local) drv_sw_scan_start(local); - ieee80211_offchannel_stop_beaconing(local); - local->leave_oper_channel_time = 0; local->next_scan_state = SCAN_DECISION; local->scan_channel_idx = 0; - drv_flush(local, false); - ieee80211_configure_filter(local); ieee80211_queue_delayed_work(&local->hw, @@ -544,7 +548,21 @@ static void ieee80211_scan_state_decision(struct ieee80211_local *local, } mutex_unlock(&local->iflist_mtx); - if (local->scan_channel) { + next_chan = local->scan_req->channels[local->scan_channel_idx]; + + if (ieee80211_cfg_on_oper_channel(local)) { + /* We're currently on operating channel. */ + if ((next_chan == local->oper_channel) && + (local->_oper_channel_type == NL80211_CHAN_NO_HT)) + /* We don't need to move off of operating channel. */ + local->next_scan_state = SCAN_SET_CHANNEL; + else + /* + * We do need to leave operating channel, as next + * scan is somewhere else. + */ + local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; + } else { /* * we're currently scanning a different channel, let's * see if we can scan another channel without interfering @@ -560,7 +578,6 @@ static void ieee80211_scan_state_decision(struct ieee80211_local *local, * * Otherwise switch back to the operating channel. */ - next_chan = local->scan_req->channels[local->scan_channel_idx]; bad_latency = time_after(jiffies + ieee80211_scan_get_channel_time(next_chan), @@ -578,12 +595,6 @@ static void ieee80211_scan_state_decision(struct ieee80211_local *local, local->next_scan_state = SCAN_ENTER_OPER_CHANNEL; else local->next_scan_state = SCAN_SET_CHANNEL; - } else { - /* - * we're on the operating channel currently, let's - * leave that channel now to scan another one - */ - local->next_scan_state = SCAN_LEAVE_OPER_CHANNEL; } *next_delay = 0; @@ -592,9 +603,7 @@ static void ieee80211_scan_state_decision(struct ieee80211_local *local, static void ieee80211_scan_state_leave_oper_channel(struct ieee80211_local *local, unsigned long *next_delay) { - ieee80211_offchannel_stop_station(local); - - __set_bit(SCAN_OFF_CHANNEL, &local->scanning); + ieee80211_offchannel_stop_vifs(local); /* * What if the nullfunc frames didn't arrive? @@ -617,15 +626,13 @@ static void ieee80211_scan_state_enter_oper_channel(struct ieee80211_local *loca { /* switch back to the operating channel */ local->scan_channel = NULL; - ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); + if (!ieee80211_cfg_on_oper_channel(local)) + ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL); /* - * Only re-enable station mode interface now; beaconing will be - * re-enabled once the full scan has been completed. + * Re-enable vifs and beaconing. */ - ieee80211_offchannel_return(local, false); - - __clear_bit(SCAN_OFF_CHANNEL, &local->scanning); + ieee80211_offchannel_return(local, true); *next_delay = HZ / 5; local->next_scan_state = SCAN_DECISION; @@ -641,8 +648,12 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local, chan = local->scan_req->channels[local->scan_channel_idx]; local->scan_channel = chan; - if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) - skip = 1; + + /* Only call hw-config if we really need to change channels. */ + if ((chan != local->hw.conf.channel) || + (local->hw.conf.channel_type != NL80211_CHAN_NO_HT)) + if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL)) + skip = 1; /* advance state machine to next channel/band */ local->scan_channel_idx++; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index e46c801..4cc8add 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -257,7 +257,8 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) return TX_CONTINUE; - if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && + if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && + test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && !ieee80211_is_probe_req(hdr->frame_control) && !ieee80211_is_nullfunc(hdr->frame_control)) /* diff --git a/net/mac80211/work.c b/net/mac80211/work.c index 36305e0..342ce1e 100644 --- a/net/mac80211/work.c +++ b/net/mac80211/work.c @@ -924,18 +924,20 @@ static void ieee80211_work_work(struct work_struct *work) } if (!started && !local->tmp_channel) { - /* - * TODO: could optimize this by leaving the - * station vifs in awake mode if they - * happen to be on the same channel as - * the requested channel - */ - ieee80211_offchannel_stop_beaconing(local); - ieee80211_offchannel_stop_station(local); - + bool ooc = ieee80211_cfg_on_oper_channel(local); local->tmp_channel = wk->chan; local->tmp_channel_type = wk->chan_type; - ieee80211_hw_config(local, 0); + /* + * Leave the station vifs in awake mode if they + * happen to be on the same channel as + * the requested channel. + */ + if (!ieee80211_cfg_on_oper_channel(local)) { + if (ooc) + /* went off operating channel */ + ieee80211_offchannel_stop_vifs(local); + ieee80211_hw_config(local, 0); + } started = true; wk->timeout = jiffies; } @@ -1011,9 +1013,20 @@ static void ieee80211_work_work(struct work_struct *work) } if (!remain_off_channel && local->tmp_channel) { + bool ooc = ieee80211_cfg_on_oper_channel(local); local->tmp_channel = NULL; - ieee80211_hw_config(local, 0); - ieee80211_offchannel_return(local, true); + /* If tmp_channel wasn't operating channel, then + * we need to go back on-channel. + * NOTE: If we can ever be here while scannning, + * or if the hw_config() channel config logic changes, + * then we may need to do a more thorough check to see if + * we still need to do a hardware config. Currently, + * we cannot be here while scanning, however. + */ + if (ieee80211_cfg_on_oper_channel(local) && !ooc) { + ieee80211_hw_config(local, 0); + ieee80211_offchannel_return(local, true); + } /* give connection some time to breathe */ run_again(local, jiffies + HZ/2); }