Return-path: Received: from mail-ee0-f51.google.com ([74.125.83.51]:50919 "EHLO mail-ee0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756280AbaCROqp (ORCPT ); Tue, 18 Mar 2014 10:46:45 -0400 Received: by mail-ee0-f51.google.com with SMTP id c13so5451219eek.38 for ; Tue, 18 Mar 2014 07:46:44 -0700 (PDT) From: Emmanuel Grumbach To: linux-wireless@vger.kernel.org Cc: Alexander Bondar , Johannes Berg , Emmanuel Grumbach Subject: [PATCH 31/35] iwlwifi: mvm: configure low latency dependent scan parameters Date: Tue, 18 Mar 2014 16:45:35 +0200 Message-Id: <1395153939-23897-31-git-send-email-egrumbach@gmail.com> (sfid-20140318_154702_334242_68F209E8) In-Reply-To: <53285AF8.7050305@gmail.com> References: <53285AF8.7050305@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Alexander Bondar In case of system low latency configure passive scan to be fragmented. Set the following scan parameters for both immediate and scheduled scan: - passive scan fragment duration = 20ms - out-of-channel time = 70ms - suspend time = 105ms Restructure channel's active/passive dwell time configuration to better suit the above change. The idea is that under low latency traffic passive scan is fragmented, i.e. that dwell on a particular channel will be fragmented. Each fragment dwell time is 20ms and fragments period is 105ms. Skipping to next channel will be delayed by the same period (105ms). So suspend_time parameter describing both fragments and channels skipping periods is set to 105ms. This value is chosen so that overall passive scan duration will not be too long. Max_out_time in this case is set to 70ms, so for active scanning operating channel will be left for 70ms while for passive still for 20ms (fragment dwell). Signed-off-by: Alexander Bondar Signed-off-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/mvm.h | 2 + drivers/net/wireless/iwlwifi/mvm/scan.c | 108 +++++++++++++++++++++++-------- drivers/net/wireless/iwlwifi/mvm/utils.c | 19 ++++++ 3 files changed, 101 insertions(+), 28 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h index d581182..abfa567 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h @@ -984,6 +984,8 @@ void iwl_mvm_update_smps(struct iwl_mvm *mvm, struct ieee80211_vif *vif, /* Low latency */ int iwl_mvm_update_low_latency(struct iwl_mvm *mvm, struct ieee80211_vif *vif, bool value); +/* get SystemLowLatencyMode - only needed for beacon threshold? */ +bool iwl_mvm_low_latency(struct iwl_mvm *mvm); /* get VMACLowLatencyMode */ static inline bool iwl_mvm_vif_low_latency(struct iwl_mvm_vif *mvmvif) { diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c index ee3f67f..c91dc84 100644 --- a/drivers/net/wireless/iwlwifi/mvm/scan.c +++ b/drivers/net/wireless/iwlwifi/mvm/scan.c @@ -74,6 +74,11 @@ struct iwl_mvm_scan_params { u32 max_out_time; u32 suspend_time; + bool passive_fragmented; + struct _dwell { + u16 passive; + u16 active; + } dwell[IEEE80211_NUM_BANDS]; }; static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm) @@ -165,15 +170,14 @@ static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band) static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd, struct cfg80211_scan_request *req, - bool basic_ssid) + bool basic_ssid, + struct iwl_mvm_scan_params *params) { - u16 passive_dwell = iwl_mvm_get_passive_dwell(req->channels[0]->band); - u16 active_dwell = iwl_mvm_get_active_dwell(req->channels[0]->band, - req->n_ssids); struct iwl_scan_channel *chan = (struct iwl_scan_channel *) (cmd->data + le16_to_cpu(cmd->tx_cmd.len)); int i; int type = BIT(req->n_ssids) - 1; + enum ieee80211_band band = req->channels[0]->band; if (!basic_ssid) type |= BIT(req->n_ssids); @@ -183,8 +187,8 @@ static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd, chan->type = cpu_to_le32(type); if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR) chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE); - chan->active_dwell = cpu_to_le16(active_dwell); - chan->passive_dwell = cpu_to_le16(passive_dwell); + chan->active_dwell = cpu_to_le16(params->dwell[band].active); + chan->passive_dwell = cpu_to_le16(params->dwell[band].passive); chan->iteration_count = cpu_to_le16(1); chan++; } @@ -262,19 +266,65 @@ static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac, } static void iwl_mvm_scan_calc_params(struct iwl_mvm *mvm, + struct ieee80211_vif *vif, + int n_ssids, struct iwl_mvm_scan_params *params) { bool global_bound = false; + enum ieee80211_band band; ieee80211_iterate_active_interfaces_atomic(mvm->hw, IEEE80211_IFACE_ITER_NORMAL, iwl_mvm_scan_condition_iterator, &global_bound); - if (!global_bound) - return; + /* + * Under low latency traffic passive scan is fragmented meaning + * that dwell on a particular channel will be fragmented. Each fragment + * dwell time is 20ms and fragments period is 105ms. Skipping to next + * channel will be delayed by the same period - 105ms. So suspend_time + * parameter describing both fragments and channels skipping periods is + * set to 105ms. This value is chosen so that overall passive scan + * duration will not be too long. Max_out_time in this case is set to + * 70ms, so for active scanning operating channel will be left for 70ms + * while for passive still for 20ms (fragment dwell). + */ + if (global_bound) { + if (!iwl_mvm_low_latency(mvm)) { + params->suspend_time = ieee80211_tu_to_usec(100); + params->max_out_time = ieee80211_tu_to_usec(600); + } else { + params->suspend_time = ieee80211_tu_to_usec(105); + /* P2P doesn't support fragmented passive scan, so + * configure max_out_time to be at least longest dwell + * time for passive scan. + */ + if (vif->type == NL80211_IFTYPE_STATION && !vif->p2p) { + params->max_out_time = ieee80211_tu_to_usec(70); + params->passive_fragmented = true; + } else { + u32 passive_dwell; + + /* + * Use band G so that passive channel dwell time + * will be assigned with maximum value. + */ + band = IEEE80211_BAND_2GHZ; + passive_dwell = iwl_mvm_get_passive_dwell(band); + params->max_out_time = + ieee80211_tu_to_usec(passive_dwell); + } + } + } - params->suspend_time = ieee80211_tu_to_usec(100); - params->max_out_time = ieee80211_tu_to_usec(600); + for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) { + if (params->passive_fragmented) + params->dwell[band].passive = 20; + else + params->dwell[band].passive = + iwl_mvm_get_passive_dwell(band); + params->dwell[band].active = iwl_mvm_get_active_dwell(band, + n_ssids); + } } int iwl_mvm_scan_request(struct iwl_mvm *mvm, @@ -311,9 +361,11 @@ int iwl_mvm_scan_request(struct iwl_mvm *mvm, cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH); cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm); - iwl_mvm_scan_calc_params(mvm, ¶ms); + iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, ¶ms); cmd->max_out_time = cpu_to_le32(params.max_out_time); cmd->suspend_time = cpu_to_le32(params.suspend_time); + if (params.passive_fragmented) + cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN; cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req); cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP | @@ -360,7 +412,7 @@ int iwl_mvm_scan_request(struct iwl_mvm *mvm, req->ie, req->ie_len, mvm->fw->ucode_capa.max_probe_length)); - iwl_mvm_scan_fill_channels(cmd, req, basic_ssid); + iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, ¶ms); cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) + le16_to_cpu(cmd->tx_cmd.len) + @@ -554,10 +606,9 @@ static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm, static void iwl_build_scan_cmd(struct iwl_mvm *mvm, struct ieee80211_vif *vif, struct cfg80211_sched_scan_request *req, - struct iwl_scan_offload_cmd *scan) + struct iwl_scan_offload_cmd *scan, + struct iwl_mvm_scan_params *params) { - struct iwl_mvm_scan_params params = {}; - scan->channel_count = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels + mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels; @@ -566,14 +617,16 @@ static void iwl_build_scan_cmd(struct iwl_mvm *mvm, scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT; scan->rx_chain = iwl_mvm_scan_rx_chain(mvm); - iwl_mvm_scan_calc_params(mvm, ¶ms); - scan->max_out_time = cpu_to_le32(params.max_out_time); - scan->suspend_time = cpu_to_le32(params.suspend_time); + scan->max_out_time = cpu_to_le32(params->max_out_time); + scan->suspend_time = cpu_to_le32(params->suspend_time); scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP | MAC_FILTER_IN_BEACON); scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND); scan->rep_count = cpu_to_le32(1); + + if (params->passive_fragmented) + scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN; } static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list) @@ -638,12 +691,11 @@ static void iwl_build_channel_cfg(struct iwl_mvm *mvm, struct iwl_scan_channel_cfg *channels, enum ieee80211_band band, int *head, int *tail, - u32 ssid_bitmap) + u32 ssid_bitmap, + struct iwl_mvm_scan_params *params) { struct ieee80211_supported_band *s_band; - int n_probes = req->n_ssids; int n_channels = req->n_channels; - u8 active_dwell, passive_dwell; int i, j, index = 0; bool partial; @@ -653,8 +705,6 @@ static void iwl_build_channel_cfg(struct iwl_mvm *mvm, * to scan. So add requested channels to head of the list and others to * the end. */ - active_dwell = iwl_mvm_get_active_dwell(band, n_probes); - passive_dwell = iwl_mvm_get_passive_dwell(band); s_band = &mvm->nvm_data->bands[band]; for (i = 0; i < s_band->n_channels && *head <= *tail; i++) { @@ -678,8 +728,8 @@ static void iwl_build_channel_cfg(struct iwl_mvm *mvm, channels->channel_number[index] = cpu_to_le16(ieee80211_frequency_to_channel( s_band->channels[i].center_freq)); - channels->dwell_time[index][0] = active_dwell; - channels->dwell_time[index][1] = passive_dwell; + channels->dwell_time[index][0] = params->dwell[band].active; + channels->dwell_time[index][1] = params->dwell[band].passive; channels->iter_count[index] = cpu_to_le16(1); channels->iter_interval[index] = 0; @@ -721,6 +771,7 @@ int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm, .id = SCAN_OFFLOAD_CONFIG_CMD, .flags = CMD_SYNC, }; + struct iwl_mvm_scan_params params = {}; lockdep_assert_held(&mvm->mutex); @@ -731,7 +782,8 @@ int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm, if (!scan_cfg) return -ENOMEM; - iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd); + iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, ¶ms); + iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, ¶ms); scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len); iwl_scan_offload_build_ssid(req, &scan_cfg->scan_cmd, &ssid_bitmap); @@ -743,7 +795,7 @@ int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm, scan_cfg->data); iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg, IEEE80211_BAND_2GHZ, &head, &tail, - ssid_bitmap); + ssid_bitmap, ¶ms); } if (band_5ghz) { iwl_scan_offload_build_tx_cmd(mvm, vif, ies, @@ -753,7 +805,7 @@ int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm, SCAN_OFFLOAD_PROBE_REQ_SIZE); iwl_build_channel_cfg(mvm, req, &scan_cfg->channel_cfg, IEEE80211_BAND_5GHZ, &head, &tail, - ssid_bitmap); + ssid_bitmap, ¶ms); } cmd.data[0] = scan_cfg; diff --git a/drivers/net/wireless/iwlwifi/mvm/utils.c b/drivers/net/wireless/iwlwifi/mvm/utils.c index e9de033d..c28da90 100644 --- a/drivers/net/wireless/iwlwifi/mvm/utils.c +++ b/drivers/net/wireless/iwlwifi/mvm/utils.c @@ -622,3 +622,22 @@ int iwl_mvm_update_low_latency(struct iwl_mvm *mvm, struct ieee80211_vif *vif, return iwl_mvm_power_update_mac(mvm, vif); } + +static void iwl_mvm_ll_iter(void *_data, u8 *mac, struct ieee80211_vif *vif) +{ + bool *result = _data; + + if (iwl_mvm_vif_low_latency(iwl_mvm_vif_from_mac80211(vif))) + *result = true; +} + +bool iwl_mvm_low_latency(struct iwl_mvm *mvm) +{ + bool result = false; + + ieee80211_iterate_active_interfaces_atomic( + mvm->hw, IEEE80211_IFACE_ITER_NORMAL, + iwl_mvm_ll_iter, &result); + + return result; +} -- 1.8.3.2