iwlwifi: mvm: detect U-APSD breaking aggregation
Try to detect that the AP is not using aggregation even when there's enough traffic to make it worthwhile; if this is the case and U-APSD is enabled then assume the AP is broken (like so many) and doesn't enable aggregation when U-APSD is used. In this case, disconnect from the AP and blacklist U-APSD for a potential new connection to it. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com>hifive-unleashed-5.1
Johannes Berg
Luca Coelho
parent
bde1492d4a
commit
b0ffe455bc
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@ -69,6 +69,8 @@
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#include <linux/ieee80211.h>
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#define IWL_MVM_UAPSD_NOAGG_BSSIDS_NUM 20
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#define IWL_MVM_DEFAULT_PS_TX_DATA_TIMEOUT (100 * USEC_PER_MSEC)
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#define IWL_MVM_DEFAULT_PS_RX_DATA_TIMEOUT (100 * USEC_PER_MSEC)
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#define IWL_MVM_WOWLAN_PS_TX_DATA_TIMEOUT (10 * USEC_PER_MSEC)
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@ -115,6 +117,8 @@
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#define IWL_MVM_TCM_LOAD_MEDIUM_THRESH 10 /* percentage */
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#define IWL_MVM_TCM_LOAD_HIGH_THRESH 50 /* percentage */
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#define IWL_MVM_TCM_LOWLAT_ENABLE_THRESH 100 /* packets/10 seconds */
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#define IWL_MVM_UAPSD_NONAGG_PERIOD 5000 /* msecs */
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#define IWL_MVM_UAPSD_NOAGG_LIST_LEN IWL_MVM_UAPSD_NOAGG_BSSIDS_NUM
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#define IWL_MVM_RS_NUM_TRY_BEFORE_ANT_TOGGLE 1
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#define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE 2
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#define IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE_TW 1
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@ -1728,6 +1728,27 @@ iwl_dbgfs_send_echo_cmd_write(struct iwl_mvm *mvm, char *buf,
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return ret ?: count;
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}
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static ssize_t
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iwl_dbgfs_uapsd_noagg_bssids_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct iwl_mvm *mvm = file->private_data;
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u8 buf[IWL_MVM_UAPSD_NOAGG_BSSIDS_NUM * ETH_ALEN * 3 + 1];
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unsigned int pos = 0;
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size_t bufsz = sizeof(buf);
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int i;
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mutex_lock(&mvm->mutex);
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for (i = 0; i < IWL_MVM_UAPSD_NOAGG_LIST_LEN; i++)
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pos += scnprintf(buf + pos, bufsz - pos, "%pM\n",
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mvm->uapsd_noagg_bssids[i].addr);
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mutex_unlock(&mvm->mutex);
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return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
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}
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MVM_DEBUGFS_READ_WRITE_FILE_OPS(prph_reg, 64);
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/* Device wide debugfs entries */
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@ -1762,6 +1783,8 @@ MVM_DEBUGFS_WRITE_FILE_OPS(indirection_tbl,
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(IWL_RSS_INDIRECTION_TABLE_SIZE * 2));
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MVM_DEBUGFS_WRITE_FILE_OPS(inject_packet, 512);
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MVM_DEBUGFS_READ_FILE_OPS(uapsd_noagg_bssids);
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#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
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MVM_DEBUGFS_READ_WRITE_FILE_OPS(bcast_filters, 256);
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MVM_DEBUGFS_READ_WRITE_FILE_OPS(bcast_filters_macs, 256);
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@ -1972,6 +1995,8 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
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mvm->debugfs_dir, &mvm->drop_bcn_ap_mode))
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goto err;
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MVM_DEBUGFS_ADD_FILE(uapsd_noagg_bssids, mvm->debugfs_dir, S_IRUSR);
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#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
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if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_BCAST_FILTERING) {
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bcast_dir = debugfs_create_dir("bcast_filtering",
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@ -952,6 +952,16 @@ static int iwl_mvm_mac_ampdu_action(struct ieee80211_hw *hw,
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switch (action) {
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case IEEE80211_AMPDU_RX_START:
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if (iwl_mvm_vif_from_mac80211(vif)->ap_sta_id ==
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iwl_mvm_sta_from_mac80211(sta)->sta_id) {
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struct iwl_mvm_vif *mvmvif;
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u16 macid = iwl_mvm_vif_from_mac80211(vif)->id;
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struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[macid];
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mdata->opened_rx_ba_sessions = true;
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mvmvif = iwl_mvm_vif_from_mac80211(vif);
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cancel_delayed_work(&mvmvif->uapsd_nonagg_detected_wk);
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}
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if (!iwl_enable_rx_ampdu(mvm->cfg)) {
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ret = -EINVAL;
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break;
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@ -1435,6 +1445,8 @@ static int iwl_mvm_mac_add_interface(struct ieee80211_hw *hw,
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mvm->p2p_device_vif = vif;
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}
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iwl_mvm_tcm_add_vif(mvm, vif);
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if (vif->type == NL80211_IFTYPE_MONITOR)
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mvm->monitor_on = true;
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@ -1486,6 +1498,10 @@ static void iwl_mvm_mac_remove_interface(struct ieee80211_hw *hw,
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iwl_mvm_prepare_mac_removal(mvm, vif);
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if (!(vif->type == NL80211_IFTYPE_AP ||
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vif->type == NL80211_IFTYPE_ADHOC))
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iwl_mvm_tcm_rm_vif(mvm, vif);
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mutex_lock(&mvm->mutex);
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if (mvm->bf_allowed_vif == mvmvif) {
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@ -2535,6 +2551,16 @@ static void iwl_mvm_sta_pre_rcu_remove(struct ieee80211_hw *hw,
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static void iwl_mvm_check_uapsd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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const u8 *bssid)
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{
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int i;
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if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
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struct iwl_mvm_tcm_mac *mdata;
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mdata = &mvm->tcm.data[iwl_mvm_vif_from_mac80211(vif)->id];
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ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
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mdata->opened_rx_ba_sessions = false;
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}
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if (!(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_UAPSD_SUPPORT))
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return;
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@ -2549,6 +2575,13 @@ static void iwl_mvm_check_uapsd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
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return;
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}
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for (i = 0; i < IWL_MVM_UAPSD_NOAGG_LIST_LEN; i++) {
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if (ether_addr_equal(mvm->uapsd_noagg_bssids[i].addr, bssid)) {
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vif->driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;
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return;
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}
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}
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vif->driver_flags |= IEEE80211_VIF_SUPPORTS_UAPSD;
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}
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@ -446,6 +446,8 @@ struct iwl_mvm_vif {
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/* FW identified misbehaving AP */
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u8 uapsd_misbehaving_bssid[ETH_ALEN];
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struct delayed_work uapsd_nonagg_detected_wk;
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/* Indicates that CSA countdown may be started */
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bool csa_countdown;
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bool csa_failed;
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@ -621,6 +623,7 @@ struct iwl_mvm_tcm_mac {
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struct ewma_rate rate;
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bool detected;
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} uapsd_nonagg_detect;
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bool opened_rx_ba_sessions;
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};
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struct iwl_mvm_tcm {
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@ -1028,6 +1031,10 @@ struct iwl_mvm {
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unsigned long bt_coex_last_tcm_ts;
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struct iwl_mvm_tcm tcm;
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u8 uapsd_noagg_bssid_write_idx;
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struct mac_address uapsd_noagg_bssids[IWL_MVM_UAPSD_NOAGG_BSSIDS_NUM]
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__aligned(2);
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struct iwl_time_quota_cmd last_quota_cmd;
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#ifdef CONFIG_NL80211_TESTMODE
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@ -1963,6 +1970,8 @@ void iwl_mvm_tcm_work(struct work_struct *work);
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void iwl_mvm_recalc_tcm(struct iwl_mvm *mvm);
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void iwl_mvm_pause_tcm(struct iwl_mvm *mvm, bool with_cancel);
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void iwl_mvm_resume_tcm(struct iwl_mvm *mvm);
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void iwl_mvm_tcm_add_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
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void iwl_mvm_tcm_rm_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
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u8 iwl_mvm_tcm_load_percentage(u32 airtime, u32 elapsed);
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void iwl_mvm_nic_restart(struct iwl_mvm *mvm, bool fw_error);
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@ -264,6 +264,12 @@ static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
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struct iwl_mvm_tcm_mac *mdata;
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int mac;
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int ac = IEEE80211_AC_BE; /* treat non-QoS as BE */
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struct iwl_mvm_vif *mvmvif;
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/* expected throughput in 100Kbps, single stream, 20 MHz */
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static const u8 thresh_tpt[] = {
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9, 18, 30, 42, 60, 78, 90, 96, 120, 135,
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};
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u16 thr;
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if (ieee80211_is_data_qos(hdr->frame_control))
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ac = tid_to_mac80211_ac[ieee80211_get_tid(hdr)];
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@ -285,6 +291,35 @@ static void iwl_mvm_rx_handle_tcm(struct iwl_mvm *mvm,
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if (!(rate_n_flags & (RATE_MCS_HT_MSK | RATE_MCS_VHT_MSK)))
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return;
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mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
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if (mdata->opened_rx_ba_sessions ||
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mdata->uapsd_nonagg_detect.detected ||
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(!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_BK].uapsd) ||
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mvmsta->sta_id != mvmvif->ap_sta_id)
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return;
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if (rate_n_flags & RATE_MCS_HT_MSK) {
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thr = thresh_tpt[rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK];
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thr *= 1 + ((rate_n_flags & RATE_HT_MCS_NSS_MSK) >>
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RATE_HT_MCS_NSS_POS);
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} else {
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if (WARN_ON((rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK) >=
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ARRAY_SIZE(thresh_tpt)))
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return;
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thr = thresh_tpt[rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK];
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thr *= 1 + ((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
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RATE_VHT_MCS_NSS_POS);
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}
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thr <<= ((rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) >>
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RATE_MCS_CHAN_WIDTH_POS);
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mdata->uapsd_nonagg_detect.rx_bytes += len;
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ewma_rate_add(&mdata->uapsd_nonagg_detect.rate, thr);
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}
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static void iwl_mvm_rx_csum(struct ieee80211_sta *sta,
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@ -693,6 +728,7 @@ void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
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int expected_size;
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int i;
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u8 *energy;
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__le32 *bytes;
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__le32 *air_time;
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__le32 flags;
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@ -768,11 +804,13 @@ void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
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struct iwl_notif_statistics_v11 *v11 = (void *)&pkt->data;
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energy = (void *)&v11->load_stats.avg_energy;
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bytes = (void *)&v11->load_stats.byte_count;
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air_time = (void *)&v11->load_stats.air_time;
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} else {
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struct iwl_notif_statistics_cdb *stats = (void *)&pkt->data;
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energy = (void *)&stats->load_stats.avg_energy;
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bytes = (void *)&stats->load_stats.byte_count;
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air_time = (void *)&stats->load_stats.air_time;
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}
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@ -802,6 +840,15 @@ void iwl_mvm_handle_rx_statistics(struct iwl_mvm *mvm,
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for (i = 0; i < NUM_MAC_INDEX_DRIVER; i++) {
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struct iwl_mvm_tcm_mac *mdata = &mvm->tcm.data[i];
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u32 airtime = le32_to_cpu(air_time[i]);
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u32 rx_bytes = le32_to_cpu(bytes[i]);
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mdata->uapsd_nonagg_detect.rx_bytes += rx_bytes;
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if (airtime) {
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/* re-init every time to store rate from FW */
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ewma_rate_init(&mdata->uapsd_nonagg_detect.rate);
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ewma_rate_add(&mdata->uapsd_nonagg_detect.rate,
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rx_bytes * 8 / airtime);
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}
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mdata->rx.airtime += airtime;
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}
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@ -1503,12 +1503,109 @@ static void iwl_mvm_tcm_results(struct iwl_mvm *mvm)
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mutex_unlock(&mvm->mutex);
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}
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static void iwl_mvm_tcm_uapsd_nonagg_detected_wk(struct work_struct *wk)
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{
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struct iwl_mvm *mvm;
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struct iwl_mvm_vif *mvmvif;
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struct ieee80211_vif *vif;
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mvmvif = container_of(wk, struct iwl_mvm_vif,
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uapsd_nonagg_detected_wk.work);
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vif = container_of((void *)mvmvif, struct ieee80211_vif, drv_priv);
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mvm = mvmvif->mvm;
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if (mvm->tcm.data[mvmvif->id].opened_rx_ba_sessions)
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return;
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/* remember that this AP is broken */
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memcpy(mvm->uapsd_noagg_bssids[mvm->uapsd_noagg_bssid_write_idx].addr,
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vif->bss_conf.bssid, ETH_ALEN);
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mvm->uapsd_noagg_bssid_write_idx++;
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if (mvm->uapsd_noagg_bssid_write_idx >= IWL_MVM_UAPSD_NOAGG_LIST_LEN)
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mvm->uapsd_noagg_bssid_write_idx = 0;
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iwl_mvm_connection_loss(mvm, vif,
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"AP isn't using AMPDU with uAPSD enabled");
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}
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static void iwl_mvm_uapsd_agg_disconnect_iter(void *data, u8 *mac,
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struct ieee80211_vif *vif)
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{
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struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
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struct iwl_mvm *mvm = mvmvif->mvm;
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int *mac_id = data;
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if (vif->type != NL80211_IFTYPE_STATION)
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return;
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if (mvmvif->id != *mac_id)
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return;
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if (!vif->bss_conf.assoc)
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return;
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if (!mvmvif->queue_params[IEEE80211_AC_VO].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_VI].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_BE].uapsd &&
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!mvmvif->queue_params[IEEE80211_AC_BK].uapsd)
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return;
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if (mvm->tcm.data[*mac_id].uapsd_nonagg_detect.detected)
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return;
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mvm->tcm.data[*mac_id].uapsd_nonagg_detect.detected = true;
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IWL_INFO(mvm,
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"detected AP should do aggregation but isn't, likely due to U-APSD\n");
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schedule_delayed_work(&mvmvif->uapsd_nonagg_detected_wk, 15 * HZ);
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}
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static void iwl_mvm_check_uapsd_agg_expected_tpt(struct iwl_mvm *mvm,
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unsigned int elapsed,
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int mac)
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{
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u64 bytes = mvm->tcm.data[mac].uapsd_nonagg_detect.rx_bytes;
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u64 tpt;
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unsigned long rate;
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rate = ewma_rate_read(&mvm->tcm.data[mac].uapsd_nonagg_detect.rate);
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if (!rate || mvm->tcm.data[mac].opened_rx_ba_sessions ||
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mvm->tcm.data[mac].uapsd_nonagg_detect.detected)
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return;
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if (iwl_mvm_has_new_rx_api(mvm)) {
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tpt = 8 * bytes; /* kbps */
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do_div(tpt, elapsed);
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rate *= 1000; /* kbps */
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if (tpt < 22 * rate / 100)
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return;
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} else {
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/*
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* the rate here is actually the threshold, in 100Kbps units,
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* so do the needed conversion from bytes to 100Kbps:
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* 100kb = bits / (100 * 1000),
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* 100kbps = 100kb / (msecs / 1000) ==
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* (bits / (100 * 1000)) / (msecs / 1000) ==
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* bits / (100 * msecs)
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*/
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tpt = (8 * bytes);
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do_div(tpt, elapsed * 100);
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if (tpt < rate)
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return;
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}
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ieee80211_iterate_active_interfaces_atomic(
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mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
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iwl_mvm_uapsd_agg_disconnect_iter, &mac);
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}
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static unsigned long iwl_mvm_calc_tcm_stats(struct iwl_mvm *mvm,
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unsigned long ts,
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bool handle_uapsd)
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{
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unsigned int elapsed = jiffies_to_msecs(ts - mvm->tcm.ts);
|
||||
unsigned int uapsd_elapsed =
|
||||
jiffies_to_msecs(ts - mvm->tcm.uapsd_nonagg_ts);
|
||||
u32 total_airtime = 0;
|
||||
int ac, mac;
|
||||
bool low_latency = false;
|
||||
|
|
@ -1551,6 +1648,12 @@ static unsigned long iwl_mvm_calc_tcm_stats(struct iwl_mvm *mvm,
|
|||
}
|
||||
low_latency |= mvm->tcm.result.low_latency[mac];
|
||||
|
||||
if (!mvm->tcm.result.low_latency[mac] && handle_uapsd)
|
||||
iwl_mvm_check_uapsd_agg_expected_tpt(mvm, uapsd_elapsed,
|
||||
mac);
|
||||
/* clear old data */
|
||||
if (handle_uapsd)
|
||||
mdata->uapsd_nonagg_detect.rx_bytes = 0;
|
||||
memset(&mdata->rx.airtime, 0, sizeof(mdata->rx.airtime));
|
||||
memset(&mdata->tx.airtime, 0, sizeof(mdata->tx.airtime));
|
||||
}
|
||||
|
|
@ -1592,7 +1695,8 @@ void iwl_mvm_recalc_tcm(struct iwl_mvm *mvm)
|
|||
{
|
||||
unsigned long ts = jiffies;
|
||||
bool handle_uapsd =
|
||||
false;
|
||||
time_after(ts, mvm->tcm.uapsd_nonagg_ts +
|
||||
msecs_to_jiffies(IWL_MVM_UAPSD_NONAGG_PERIOD));
|
||||
|
||||
spin_lock(&mvm->tcm.lock);
|
||||
if (mvm->tcm.paused || !time_after(ts, mvm->tcm.ts + MVM_TCM_PERIOD)) {
|
||||
|
|
@ -1601,6 +1705,12 @@ void iwl_mvm_recalc_tcm(struct iwl_mvm *mvm)
|
|||
}
|
||||
spin_unlock(&mvm->tcm.lock);
|
||||
|
||||
if (handle_uapsd && iwl_mvm_has_new_rx_api(mvm)) {
|
||||
mutex_lock(&mvm->mutex);
|
||||
if (iwl_mvm_request_statistics(mvm, true))
|
||||
handle_uapsd = false;
|
||||
mutex_unlock(&mvm->mutex);
|
||||
}
|
||||
|
||||
spin_lock(&mvm->tcm.lock);
|
||||
/* re-check if somebody else won the recheck race */
|
||||
|
|
@ -1659,6 +1769,21 @@ void iwl_mvm_resume_tcm(struct iwl_mvm *mvm)
|
|||
spin_unlock_bh(&mvm->tcm.lock);
|
||||
}
|
||||
|
||||
void iwl_mvm_tcm_add_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
|
||||
{
|
||||
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
|
||||
|
||||
INIT_DELAYED_WORK(&mvmvif->uapsd_nonagg_detected_wk,
|
||||
iwl_mvm_tcm_uapsd_nonagg_detected_wk);
|
||||
}
|
||||
|
||||
void iwl_mvm_tcm_rm_vif(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
|
||||
{
|
||||
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
|
||||
|
||||
cancel_delayed_work_sync(&mvmvif->uapsd_nonagg_detected_wk);
|
||||
}
|
||||
|
||||
|
||||
void iwl_mvm_get_sync_time(struct iwl_mvm *mvm, u32 *gp2, u64 *boottime)
|
||||
{
|
||||
|
|
|
|||
Loading…
Reference in New Issue