iwlwifi: clarify and clean up chain settings
The chain settings we currently use in iwlwifi are rather confusing -- and we also go by the wrong settings entirely under certain circumstances. To clean it up, create a new variable in the current HT config -- single_chain_sufficient -- that tells us whether we need more than one chain. Calculate that based on the AP and operating mode (no IBSS HT implemented -- so no need for multiple chains, for station mode we use the AP's capabilities). Additionally, since APs always send disabled SM PS mode, keeping track of their sm_ps mode isn't very useful -- doubly not so for our _own_ RX config since that should depend on our, not the AP's, SM PS mode. Finally, document that our configuration of the number of RX chains used is currently wrong when in powersave (by adding a comment). All together this removes the two remaining items in struct iwl_ht_config that were done wrong there. For the future, the number of RX chains and some SM PS handshaking needs to be added to mac80211, which then needs to tell us, and the new variable current_ht_config.single_chain_sufficient should also be calculated by mac80211. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Acked-by: Daniel C Halperin <daniel.c.halperin@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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@ -607,8 +607,7 @@ EXPORT_SYMBOL(iwlcore_free_geos);
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static bool is_single_rx_stream(struct iwl_priv *priv)
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{
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return !priv->current_ht_config.is_ht ||
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((priv->current_ht_config.mcs.rx_mask[1] == 0) &&
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(priv->current_ht_config.mcs.rx_mask[2] == 0));
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priv->current_ht_config.single_chain_sufficient;
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}
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static u8 iwl_is_channel_extension(struct iwl_priv *priv,
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@ -936,12 +935,8 @@ void iwl_set_rxon_ht(struct iwl_priv *priv, struct iwl_ht_config *ht_conf)
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if (priv->cfg->ops->hcmd->set_rxon_chain)
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priv->cfg->ops->hcmd->set_rxon_chain(priv);
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IWL_DEBUG_ASSOC(priv, "supported HT rate 0x%X 0x%X 0x%X "
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"rxon flags 0x%X operation mode :0x%X "
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IWL_DEBUG_ASSOC(priv, "rxon flags 0x%X operation mode :0x%X "
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"extension channel offset 0x%x\n",
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ht_conf->mcs.rx_mask[0],
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ht_conf->mcs.rx_mask[1],
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ht_conf->mcs.rx_mask[2],
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le32_to_cpu(rxon->flags), ht_conf->ht_protection,
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ht_conf->extension_chan_offset);
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return;
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@ -960,12 +955,8 @@ EXPORT_SYMBOL(iwl_set_rxon_ht);
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*/
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static int iwl_get_active_rx_chain_count(struct iwl_priv *priv)
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{
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bool is_single = is_single_rx_stream(priv);
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bool is_cam = !test_bit(STATUS_POWER_PMI, &priv->status);
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/* # of Rx chains to use when expecting MIMO. */
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if (is_single || (!is_cam && (priv->current_ht_config.sm_ps ==
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WLAN_HT_CAP_SM_PS_STATIC)))
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if (is_single_rx_stream(priv))
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return IWL_NUM_RX_CHAINS_SINGLE;
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else
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return IWL_NUM_RX_CHAINS_MULTIPLE;
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@ -973,27 +964,17 @@ static int iwl_get_active_rx_chain_count(struct iwl_priv *priv)
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static int iwl_get_idle_rx_chain_count(struct iwl_priv *priv, int active_cnt)
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{
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int idle_cnt;
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bool is_cam = !test_bit(STATUS_POWER_PMI, &priv->status);
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/* # Rx chains when idling and maybe trying to save power */
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switch (priv->current_ht_config.sm_ps) {
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case WLAN_HT_CAP_SM_PS_STATIC:
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case WLAN_HT_CAP_SM_PS_DYNAMIC:
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idle_cnt = (is_cam) ? IWL_NUM_IDLE_CHAINS_DUAL :
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IWL_NUM_IDLE_CHAINS_SINGLE;
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break;
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case WLAN_HT_CAP_SM_PS_DISABLED:
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idle_cnt = (is_cam) ? active_cnt : IWL_NUM_IDLE_CHAINS_SINGLE;
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break;
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case WLAN_HT_CAP_SM_PS_INVALID:
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default:
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IWL_ERR(priv, "invalid mimo ps mode %d\n",
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priv->current_ht_config.sm_ps);
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WARN_ON(1);
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idle_cnt = -1;
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break;
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}
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return idle_cnt;
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/*
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* XXX: this is incorrect!!
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* we always indicate to the AP that
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* our SM PS mode is "disabled"
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*/
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return is_cam ? active_cnt : IWL_NUM_IDLE_CHAINS_SINGLE;
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}
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/* up to 4 chains */
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@ -1493,8 +1474,6 @@ int iwl_init_drv(struct iwl_priv *priv)
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priv->iw_mode = NL80211_IFTYPE_STATION;
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priv->current_ht_config.sm_ps = WLAN_HT_CAP_SM_PS_DISABLED;
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/* Choose which receivers/antennas to use */
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if (priv->cfg->ops->hcmd->set_rxon_chain)
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priv->cfg->ops->hcmd->set_rxon_chain(priv);
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@ -2229,7 +2208,6 @@ static void iwl_ht_conf(struct iwl_priv *priv,
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struct ieee80211_bss_conf *bss_conf)
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{
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struct iwl_ht_config *ht_conf = &priv->current_ht_config;
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struct ieee80211_sta_ht_cap *ht_cap;
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struct ieee80211_sta *sta;
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IWL_DEBUG_MAC80211(priv, "enter: \n");
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@ -2237,31 +2215,48 @@ static void iwl_ht_conf(struct iwl_priv *priv,
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if (!ht_conf->is_ht)
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return;
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/*
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* It is totally wrong to base global information on something
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* that is valid only when associated, alas, this driver works
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* that way and I don't know how to fix it.
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*/
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rcu_read_lock();
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sta = ieee80211_find_sta(priv->hw, priv->bssid);
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if (!sta) {
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rcu_read_unlock();
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return;
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}
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ht_cap = &sta->ht_cap;
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ht_conf->sm_ps = (u8)((ht_cap->cap & IEEE80211_HT_CAP_SM_PS) >> 2);
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memcpy(&ht_conf->mcs, &ht_cap->mcs, 16);
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ht_conf->ht_protection =
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bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
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ht_conf->non_GF_STA_present =
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!!(bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
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ht_conf->single_chain_sufficient = false;
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switch (priv->iw_mode) {
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case NL80211_IFTYPE_STATION:
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rcu_read_lock();
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sta = ieee80211_find_sta(priv->hw, priv->bssid);
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if (sta) {
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struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
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int maxstreams;
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maxstreams = (ht_cap->mcs.tx_params &
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IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
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>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
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maxstreams += 1;
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if ((ht_cap->mcs.rx_mask[1] == 0) &&
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(ht_cap->mcs.rx_mask[2] == 0))
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ht_conf->single_chain_sufficient = true;
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if (maxstreams <= 1)
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ht_conf->single_chain_sufficient = true;
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} else {
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/*
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* If at all, this can only happen through a race
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* when the AP disconnects us while we're still
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* setting up the connection, in that case mac80211
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* will soon tell us about that.
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*/
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ht_conf->single_chain_sufficient = true;
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}
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rcu_read_unlock();
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break;
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case NL80211_IFTYPE_ADHOC:
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ht_conf->single_chain_sufficient = true;
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break;
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default:
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break;
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}
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IWL_DEBUG_MAC80211(priv, "leave\n");
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}
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@ -506,8 +506,7 @@ struct iwl_ht_config {
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/* self configuration data */
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bool is_ht;
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bool is_40mhz;
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u8 sm_ps;
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struct ieee80211_mcs_info mcs;
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bool single_chain_sufficient;
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/* BSS related data */
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u8 extension_chan_offset;
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u8 ht_protection;
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