diff options
Diffstat (limited to 'sys/contrib/dev/iwlwifi/mld/link.c')
| -rw-r--r-- | sys/contrib/dev/iwlwifi/mld/link.c | 895 |
1 files changed, 895 insertions, 0 deletions
diff --git a/sys/contrib/dev/iwlwifi/mld/link.c b/sys/contrib/dev/iwlwifi/mld/link.c new file mode 100644 index 000000000000..782fc41aa1c3 --- /dev/null +++ b/sys/contrib/dev/iwlwifi/mld/link.c @@ -0,0 +1,895 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* + * Copyright (C) 2024-2025 Intel Corporation + */ + +#include "constants.h" +#include "link.h" +#include "iface.h" +#include "mlo.h" +#include "hcmd.h" +#include "phy.h" +#include "fw/api/rs.h" +#include "fw/api/txq.h" +#include "fw/api/mac.h" + +#include "fw/api/context.h" +#include "fw/dbg.h" + +static int iwl_mld_send_link_cmd(struct iwl_mld *mld, + struct iwl_link_config_cmd *cmd, + enum iwl_ctxt_action action) +{ + int ret; + + lockdep_assert_wiphy(mld->wiphy); + + cmd->action = cpu_to_le32(action); + ret = iwl_mld_send_cmd_pdu(mld, + WIDE_ID(MAC_CONF_GROUP, LINK_CONFIG_CMD), + cmd); + if (ret) + IWL_ERR(mld, "Failed to send LINK_CONFIG_CMD (action:%d): %d\n", + action, ret); + return ret; +} + +static int iwl_mld_add_link_to_fw(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf) +{ + struct ieee80211_vif *vif = link_conf->vif; + struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif); + struct iwl_mld_link *link = iwl_mld_link_from_mac80211(link_conf); + struct iwl_link_config_cmd cmd = {}; + + lockdep_assert_wiphy(mld->wiphy); + + if (WARN_ON(!link)) + return -EINVAL; + + cmd.link_id = cpu_to_le32(link->fw_id); + cmd.mac_id = cpu_to_le32(mld_vif->fw_id); + cmd.spec_link_id = link_conf->link_id; + cmd.phy_id = cpu_to_le32(FW_CTXT_ID_INVALID); + + ether_addr_copy(cmd.local_link_addr, link_conf->addr); + + if (vif->type == NL80211_IFTYPE_ADHOC && link_conf->bssid) + ether_addr_copy(cmd.ibss_bssid_addr, link_conf->bssid); + + return iwl_mld_send_link_cmd(mld, &cmd, FW_CTXT_ACTION_ADD); +} + +/* Get the basic rates of the used band and add the mandatory ones */ +static void iwl_mld_fill_rates(struct iwl_mld *mld, + struct ieee80211_bss_conf *link, + struct ieee80211_chanctx_conf *chan_ctx, + __le32 *cck_rates, __le32 *ofdm_rates) +{ + struct cfg80211_chan_def *chandef = + iwl_mld_get_chandef_from_chanctx(mld, chan_ctx); + struct ieee80211_supported_band *sband = + mld->hw->wiphy->bands[chandef->chan->band]; + unsigned long basic = link->basic_rates; + int lowest_present_ofdm = 100; + int lowest_present_cck = 100; + u32 cck = 0; + u32 ofdm = 0; + int i; + + for_each_set_bit(i, &basic, BITS_PER_LONG) { + int hw = sband->bitrates[i].hw_value; + + if (hw >= IWL_FIRST_OFDM_RATE) { + ofdm |= BIT(hw - IWL_FIRST_OFDM_RATE); + if (lowest_present_ofdm > hw) + lowest_present_ofdm = hw; + } else { + BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0); + + cck |= BIT(hw); + if (lowest_present_cck > hw) + lowest_present_cck = hw; + } + } + + /* Now we've got the basic rates as bitmaps in the ofdm and cck + * variables. This isn't sufficient though, as there might not + * be all the right rates in the bitmap. E.g. if the only basic + * rates are 5.5 Mbps and 11 Mbps, we still need to add 1 Mbps + * and 6 Mbps because the 802.11-2007 standard says in 9.6: + * + * [...] a STA responding to a received frame shall transmit + * its Control Response frame [...] at the highest rate in the + * BSSBasicRateSet parameter that is less than or equal to the + * rate of the immediately previous frame in the frame exchange + * sequence ([...]) and that is of the same modulation class + * ([...]) as the received frame. If no rate contained in the + * BSSBasicRateSet parameter meets these conditions, then the + * control frame sent in response to a received frame shall be + * transmitted at the highest mandatory rate of the PHY that is + * less than or equal to the rate of the received frame, and + * that is of the same modulation class as the received frame. + * + * As a consequence, we need to add all mandatory rates that are + * lower than all of the basic rates to these bitmaps. + */ + + if (lowest_present_ofdm > IWL_RATE_24M_INDEX) + ofdm |= IWL_RATE_BIT_MSK(24) >> IWL_FIRST_OFDM_RATE; + if (lowest_present_ofdm > IWL_RATE_12M_INDEX) + ofdm |= IWL_RATE_BIT_MSK(12) >> IWL_FIRST_OFDM_RATE; + /* 6M already there or needed so always add */ + ofdm |= IWL_RATE_BIT_MSK(6) >> IWL_FIRST_OFDM_RATE; + + /* CCK is a bit more complex with DSSS vs. HR/DSSS vs. ERP. + * Note, however: + * - if no CCK rates are basic, it must be ERP since there must + * be some basic rates at all, so they're OFDM => ERP PHY + * (or we're in 5 GHz, and the cck bitmap will never be used) + * - if 11M is a basic rate, it must be ERP as well, so add 5.5M + * - if 5.5M is basic, 1M and 2M are mandatory + * - if 2M is basic, 1M is mandatory + * - if 1M is basic, that's the only valid ACK rate. + * As a consequence, it's not as complicated as it sounds, just add + * any lower rates to the ACK rate bitmap. + */ + if (lowest_present_cck > IWL_RATE_11M_INDEX) + cck |= IWL_RATE_BIT_MSK(11) >> IWL_FIRST_CCK_RATE; + if (lowest_present_cck > IWL_RATE_5M_INDEX) + cck |= IWL_RATE_BIT_MSK(5) >> IWL_FIRST_CCK_RATE; + if (lowest_present_cck > IWL_RATE_2M_INDEX) + cck |= IWL_RATE_BIT_MSK(2) >> IWL_FIRST_CCK_RATE; + /* 1M already there or needed so always add */ + cck |= IWL_RATE_BIT_MSK(1) >> IWL_FIRST_CCK_RATE; + + *cck_rates = cpu_to_le32((u32)cck); + *ofdm_rates = cpu_to_le32((u32)ofdm); +} + +static void iwl_mld_fill_protection_flags(struct iwl_mld *mld, + struct ieee80211_bss_conf *link, + __le32 *protection_flags) +{ + u8 protection_mode = link->ht_operation_mode & + IEEE80211_HT_OP_MODE_PROTECTION; + u8 ht_flag = LINK_PROT_FLG_HT_PROT | LINK_PROT_FLG_FAT_PROT; + + IWL_DEBUG_RATE(mld, "HT protection mode: %d\n", protection_mode); + + if (link->use_cts_prot) + *protection_flags |= cpu_to_le32(LINK_PROT_FLG_TGG_PROTECT); + + /* See section 9.23.3.1 of IEEE 80211-2012. + * Nongreenfield HT STAs Present is not supported. + */ + switch (protection_mode) { + case IEEE80211_HT_OP_MODE_PROTECTION_NONE: + break; + case IEEE80211_HT_OP_MODE_PROTECTION_NONMEMBER: + case IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED: + *protection_flags |= cpu_to_le32(ht_flag); + break; + case IEEE80211_HT_OP_MODE_PROTECTION_20MHZ: + /* Protect when channel wider than 20MHz */ + if (link->chanreq.oper.width > NL80211_CHAN_WIDTH_20) + *protection_flags |= cpu_to_le32(ht_flag); + break; + } +} + +static u8 iwl_mld_mac80211_ac_to_fw_ac(enum ieee80211_ac_numbers ac) +{ + static const u8 mac80211_ac_to_fw[] = { + AC_VO, + AC_VI, + AC_BE, + AC_BK + }; + + return mac80211_ac_to_fw[ac]; +} + +static void iwl_mld_fill_qos_params(struct ieee80211_bss_conf *link, + struct iwl_ac_qos *ac, __le32 *qos_flags) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link); + + /* no need to check mld_link since it is done in the caller */ + + for (int mac_ac = 0; mac_ac < IEEE80211_NUM_ACS; mac_ac++) { + u8 txf = iwl_mld_mac80211_ac_to_fw_tx_fifo(mac_ac); + u8 fw_ac = iwl_mld_mac80211_ac_to_fw_ac(mac_ac); + + ac[fw_ac].cw_min = + cpu_to_le16(mld_link->queue_params[mac_ac].cw_min); + ac[fw_ac].cw_max = + cpu_to_le16(mld_link->queue_params[mac_ac].cw_max); + ac[fw_ac].edca_txop = + cpu_to_le16(mld_link->queue_params[mac_ac].txop * 32); + ac[fw_ac].aifsn = mld_link->queue_params[mac_ac].aifs; + ac[fw_ac].fifos_mask = BIT(txf); + } + + if (link->qos) + *qos_flags |= cpu_to_le32(MAC_QOS_FLG_UPDATE_EDCA); + + if (link->chanreq.oper.width != NL80211_CHAN_WIDTH_20_NOHT) + *qos_flags |= cpu_to_le32(MAC_QOS_FLG_TGN); +} + +static bool iwl_mld_fill_mu_edca(struct iwl_mld *mld, + const struct iwl_mld_link *mld_link, + struct iwl_he_backoff_conf *trig_based_txf) +{ + for (int mac_ac = 0; mac_ac < IEEE80211_NUM_ACS; mac_ac++) { + const struct ieee80211_he_mu_edca_param_ac_rec *mu_edca = + &mld_link->queue_params[mac_ac].mu_edca_param_rec; + u8 fw_ac = iwl_mld_mac80211_ac_to_fw_ac(mac_ac); + + if (!mld_link->queue_params[mac_ac].mu_edca) + return false; + + trig_based_txf[fw_ac].cwmin = + cpu_to_le16(mu_edca->ecw_min_max & 0xf); + trig_based_txf[fw_ac].cwmax = + cpu_to_le16((mu_edca->ecw_min_max & 0xf0) >> 4); + trig_based_txf[fw_ac].aifsn = + cpu_to_le16(mu_edca->aifsn & 0xf); + trig_based_txf[fw_ac].mu_time = + cpu_to_le16(mu_edca->mu_edca_timer); + } + return true; +} + +int +iwl_mld_change_link_in_fw(struct iwl_mld *mld, struct ieee80211_bss_conf *link, + u32 changes) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link); + struct ieee80211_vif *vif = link->vif; + struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif); + struct ieee80211_chanctx_conf *chan_ctx; + struct iwl_link_config_cmd cmd = {}; + u32 flags = 0; + + lockdep_assert_wiphy(mld->wiphy); + + if (WARN_ON(!mld_link)) + return -EINVAL; + + cmd.link_id = cpu_to_le32(mld_link->fw_id); + cmd.spec_link_id = link->link_id; + cmd.mac_id = cpu_to_le32(mld_vif->fw_id); + + chan_ctx = wiphy_dereference(mld->wiphy, mld_link->chan_ctx); + + cmd.phy_id = cpu_to_le32(chan_ctx ? + iwl_mld_phy_from_mac80211(chan_ctx)->fw_id : + FW_CTXT_ID_INVALID); + + ether_addr_copy(cmd.local_link_addr, link->addr); + + cmd.active = cpu_to_le32(mld_link->active); + + if ((changes & LINK_CONTEXT_MODIFY_ACTIVE) && !mld_link->active && + mld_link->silent_deactivation) { + /* We are de-activating a link that is having CSA with + * immediate quiet in EMLSR. Tell the firmware not to send any + * frame. + */ + cmd.block_tx = 1; + mld_link->silent_deactivation = false; + } + + if (vif->type == NL80211_IFTYPE_ADHOC && link->bssid) + ether_addr_copy(cmd.ibss_bssid_addr, link->bssid); + + /* Channel context is needed to get the rates */ + if (chan_ctx) + iwl_mld_fill_rates(mld, link, chan_ctx, &cmd.cck_rates, + &cmd.ofdm_rates); + + cmd.cck_short_preamble = cpu_to_le32(link->use_short_preamble); + cmd.short_slot = cpu_to_le32(link->use_short_slot); + + iwl_mld_fill_protection_flags(mld, link, &cmd.protection_flags); + + iwl_mld_fill_qos_params(link, cmd.ac, &cmd.qos_flags); + + cmd.bi = cpu_to_le32(link->beacon_int); + cmd.dtim_interval = cpu_to_le32(link->beacon_int * link->dtim_period); + + /* Configure HE parameters only if HE is supported, and only after + * the parameters are set in mac80211 (meaning after assoc) + */ + if (!link->he_support || iwlwifi_mod_params.disable_11ax || + (vif->type == NL80211_IFTYPE_STATION && !vif->cfg.assoc)) { + changes &= ~LINK_CONTEXT_MODIFY_HE_PARAMS; + goto send_cmd; + } + + /* ap_sta may be NULL if we're disconnecting */ + if (mld_vif->ap_sta) { + struct ieee80211_link_sta *link_sta = + link_sta_dereference_check(mld_vif->ap_sta, + link->link_id); + + if (!WARN_ON(!link_sta) && link_sta->he_cap.has_he && + link_sta->he_cap.he_cap_elem.mac_cap_info[5] & + IEEE80211_HE_MAC_CAP5_OM_CTRL_UL_MU_DATA_DIS_RX) + cmd.ul_mu_data_disable = 1; + } + + cmd.htc_trig_based_pkt_ext = link->htc_trig_based_pkt_ext; + + if (link->uora_exists) { + cmd.rand_alloc_ecwmin = link->uora_ocw_range & 0x7; + cmd.rand_alloc_ecwmax = (link->uora_ocw_range >> 3) & 0x7; + } + + if (iwl_mld_fill_mu_edca(mld, mld_link, cmd.trig_based_txf)) + flags |= LINK_FLG_MU_EDCA_CW; + + cmd.bss_color = link->he_bss_color.color; + + if (!link->he_bss_color.enabled) + flags |= LINK_FLG_BSS_COLOR_DIS; + + cmd.frame_time_rts_th = cpu_to_le16(link->frame_time_rts_th); + + /* Block 26-tone RU OFDMA transmissions */ + if (mld_link->he_ru_2mhz_block) + flags |= LINK_FLG_RU_2MHZ_BLOCK; + + if (link->nontransmitted) { + ether_addr_copy(cmd.ref_bssid_addr, link->transmitter_bssid); + cmd.bssid_index = link->bssid_index; + } + + /* The only EHT parameter is puncturing, and starting from PHY cmd + * version 6 - it is sent there. For older versions of the PHY cmd, + * puncturing is not needed at all. + */ + if (WARN_ON(changes & LINK_CONTEXT_MODIFY_EHT_PARAMS)) + changes &= ~LINK_CONTEXT_MODIFY_EHT_PARAMS; + +send_cmd: + cmd.modify_mask = cpu_to_le32(changes); + cmd.flags = cpu_to_le32(flags); + + return iwl_mld_send_link_cmd(mld, &cmd, FW_CTXT_ACTION_MODIFY); +} + +int iwl_mld_activate_link(struct iwl_mld *mld, + struct ieee80211_bss_conf *link) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link); + struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(link->vif); + int ret; + + lockdep_assert_wiphy(mld->wiphy); + + if (WARN_ON(!mld_link || mld_link->active)) + return -EINVAL; + + mld_link->active = true; + + ret = iwl_mld_change_link_in_fw(mld, link, + LINK_CONTEXT_MODIFY_ACTIVE); + if (ret) + mld_link->active = false; + else + mld_vif->last_link_activation_time = + ktime_get_boottime_seconds(); + + return ret; +} + +void iwl_mld_deactivate_link(struct iwl_mld *mld, + struct ieee80211_bss_conf *link) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link); + struct iwl_probe_resp_data *probe_data; + + lockdep_assert_wiphy(mld->wiphy); + + if (WARN_ON(!mld_link || !mld_link->active)) + return; + + iwl_mld_cancel_session_protection(mld, link->vif, link->link_id); + + /* If we deactivate the link, we will probably remove it, or switch + * channel. In both cases, the CSA or Notice of Absence information is + * now irrelevant. Remove the data here. + */ + probe_data = wiphy_dereference(mld->wiphy, mld_link->probe_resp_data); + RCU_INIT_POINTER(mld_link->probe_resp_data, NULL); + if (probe_data) + kfree_rcu(probe_data, rcu_head); + + mld_link->active = false; + + iwl_mld_change_link_in_fw(mld, link, LINK_CONTEXT_MODIFY_ACTIVE); + + /* Now that the link is not active in FW, we don't expect any new + * notifications for it. Cancel the ones that are already pending + */ + iwl_mld_cancel_notifications_of_object(mld, IWL_MLD_OBJECT_TYPE_LINK, + mld_link->fw_id); +} + +static void +iwl_mld_rm_link_from_fw(struct iwl_mld *mld, struct ieee80211_bss_conf *link) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link); + struct iwl_link_config_cmd cmd = {}; + + lockdep_assert_wiphy(mld->wiphy); + + if (WARN_ON(!mld_link)) + return; + + cmd.link_id = cpu_to_le32(mld_link->fw_id); + cmd.spec_link_id = link->link_id; + cmd.phy_id = cpu_to_le32(FW_CTXT_ID_INVALID); + + iwl_mld_send_link_cmd(mld, &cmd, FW_CTXT_ACTION_REMOVE); +} + +IWL_MLD_ALLOC_FN(link, bss_conf) + +/* Constructor function for struct iwl_mld_link */ +static int +iwl_mld_init_link(struct iwl_mld *mld, struct ieee80211_bss_conf *link, + struct iwl_mld_link *mld_link) +{ + mld_link->average_beacon_energy = 0; + + iwl_mld_init_internal_sta(&mld_link->bcast_sta); + iwl_mld_init_internal_sta(&mld_link->mcast_sta); + iwl_mld_init_internal_sta(&mld_link->mon_sta); + + return iwl_mld_allocate_link_fw_id(mld, &mld_link->fw_id, link); +} + +/* Initializes the link structure, maps fw id to the ieee80211_bss_conf, and + * adds a link to the fw + */ +int iwl_mld_add_link(struct iwl_mld *mld, + struct ieee80211_bss_conf *bss_conf) +{ + struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(bss_conf->vif); + struct iwl_mld_link *link = iwl_mld_link_from_mac80211(bss_conf); + bool is_deflink = bss_conf == &bss_conf->vif->bss_conf; + int ret; + + if (!link) { + if (is_deflink) + link = &mld_vif->deflink; + else + link = kzalloc(sizeof(*link), GFP_KERNEL); + } else { + WARN_ON(!mld->fw_status.in_hw_restart); + } + + ret = iwl_mld_init_link(mld, bss_conf, link); + if (ret) + goto free; + + rcu_assign_pointer(mld_vif->link[bss_conf->link_id], link); + + ret = iwl_mld_add_link_to_fw(mld, bss_conf); + if (ret) { + RCU_INIT_POINTER(mld->fw_id_to_bss_conf[link->fw_id], NULL); + RCU_INIT_POINTER(mld_vif->link[bss_conf->link_id], NULL); + goto free; + } + + return ret; + +free: + if (!is_deflink) + kfree(link); + return ret; +} + +/* Remove link from fw, unmap the bss_conf, and destroy the link structure */ +void iwl_mld_remove_link(struct iwl_mld *mld, + struct ieee80211_bss_conf *bss_conf) +{ + struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(bss_conf->vif); + struct iwl_mld_link *link = iwl_mld_link_from_mac80211(bss_conf); + bool is_deflink = link == &mld_vif->deflink; + + if (WARN_ON(!link || link->active)) + return; + + iwl_mld_rm_link_from_fw(mld, bss_conf); + /* Continue cleanup on failure */ + + if (!is_deflink) + kfree_rcu(link, rcu_head); + + RCU_INIT_POINTER(mld_vif->link[bss_conf->link_id], NULL); + + if (WARN_ON(link->fw_id >= mld->fw->ucode_capa.num_links)) + return; + + RCU_INIT_POINTER(mld->fw_id_to_bss_conf[link->fw_id], NULL); +} + +void iwl_mld_handle_missed_beacon_notif(struct iwl_mld *mld, + struct iwl_rx_packet *pkt) +{ + const struct iwl_missed_beacons_notif *notif = (const void *)pkt->data; + union iwl_dbg_tlv_tp_data tp_data = { .fw_pkt = pkt }; + u32 fw_link_id = le32_to_cpu(notif->link_id); + u32 missed_bcon = le32_to_cpu(notif->consec_missed_beacons); + u32 missed_bcon_since_rx = + le32_to_cpu(notif->consec_missed_beacons_since_last_rx); + u32 scnd_lnk_bcn_lost = + le32_to_cpu(notif->consec_missed_beacons_other_link); + struct ieee80211_bss_conf *link_conf = + iwl_mld_fw_id_to_link_conf(mld, fw_link_id); + u32 bss_param_ch_cnt_link_id; + struct ieee80211_vif *vif; + u8 link_id; + + if (WARN_ON(!link_conf)) + return; + + vif = link_conf->vif; + link_id = link_conf->link_id; + bss_param_ch_cnt_link_id = link_conf->bss_param_ch_cnt_link_id; + + IWL_DEBUG_INFO(mld, + "missed bcn link_id=%u, %u consecutive=%u\n", + link_id, missed_bcon, missed_bcon_since_rx); + + if (WARN_ON(!vif)) + return; + + mld->trans->dbg.dump_file_name_ext_valid = true; + snprintf(mld->trans->dbg.dump_file_name_ext, IWL_FW_INI_MAX_NAME, + "LinkId_%d_MacType_%d", fw_link_id, + iwl_mld_mac80211_iftype_to_fw(vif)); + + iwl_dbg_tlv_time_point(&mld->fwrt, + IWL_FW_INI_TIME_POINT_MISSED_BEACONS, &tp_data); + + if (missed_bcon >= IWL_MLD_MISSED_BEACONS_THRESHOLD_LONG) { + if (missed_bcon_since_rx >= + IWL_MLD_MISSED_BEACONS_SINCE_RX_THOLD) { + ieee80211_connection_loss(vif); + return; + } + IWL_WARN(mld, + "missed beacons exceeds threshold, but receiving data. Stay connected, Expect bugs.\n"); + return; + } + + if (missed_bcon_since_rx > IWL_MLD_MISSED_BEACONS_THRESHOLD) { + ieee80211_cqm_beacon_loss_notify(vif, GFP_ATOMIC); + + /* try to switch links, no-op if we don't have MLO */ + iwl_mld_int_mlo_scan(mld, vif); + } + + /* no more logic if we're not in EMLSR */ + if (hweight16(vif->active_links) <= 1) + return; + + /* We are processing a notification before link activation */ + if (le32_to_cpu(notif->other_link_id) == FW_CTXT_ID_INVALID) + return; + + /* Exit EMLSR if we lost more than + * IWL_MLD_MISSED_BEACONS_EXIT_ESR_THRESH beacons on boths links + * OR more than IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH on current link. + * OR more than IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH_BSS_PARAM_CHANGED + * on current link and the link's bss_param_ch_count has changed on + * the other link's beacon. + */ + if ((missed_bcon >= IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH_2_LINKS && + scnd_lnk_bcn_lost >= IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH_2_LINKS) || + missed_bcon >= IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH || + (bss_param_ch_cnt_link_id != link_id && + missed_bcon >= + IWL_MLD_BCN_LOSS_EXIT_ESR_THRESH_BSS_PARAM_CHANGED)) { + iwl_mld_exit_emlsr(mld, vif, IWL_MLD_EMLSR_EXIT_MISSED_BEACON, + iwl_mld_get_primary_link(vif)); + } +} +EXPORT_SYMBOL_IF_IWLWIFI_KUNIT(iwl_mld_handle_missed_beacon_notif); + +bool iwl_mld_cancel_missed_beacon_notif(struct iwl_mld *mld, + struct iwl_rx_packet *pkt, + u32 removed_link_id) +{ + struct iwl_missed_beacons_notif *notif = (void *)pkt->data; + + if (le32_to_cpu(notif->other_link_id) == removed_link_id) { + /* Second link is being removed. Don't cancel the notification, + * but mark second link as invalid. + */ + notif->other_link_id = cpu_to_le32(FW_CTXT_ID_INVALID); + } + + /* If the primary link is removed, cancel the notification */ + return le32_to_cpu(notif->link_id) == removed_link_id; +} + +int iwl_mld_link_set_associated(struct iwl_mld *mld, struct ieee80211_vif *vif, + struct ieee80211_bss_conf *link) +{ + return iwl_mld_change_link_in_fw(mld, link, LINK_CONTEXT_MODIFY_ALL & + ~(LINK_CONTEXT_MODIFY_ACTIVE | + LINK_CONTEXT_MODIFY_EHT_PARAMS)); +} + +struct iwl_mld_rssi_to_grade { + s8 rssi[2]; + u16 grade; +}; + +#define RSSI_TO_GRADE_LINE(_lb, _hb_uhb, _grade) \ + { \ + .rssi = {_lb, _hb_uhb}, \ + .grade = _grade \ + } + +/* + * This array must be sorted by increasing RSSI for proper functionality. + * The grades are actually estimated throughput, represented as fixed-point + * with a scale factor of 1/10. + */ +static const struct iwl_mld_rssi_to_grade rssi_to_grade_map[] = { + RSSI_TO_GRADE_LINE(-85, -89, 172), + RSSI_TO_GRADE_LINE(-83, -86, 344), + RSSI_TO_GRADE_LINE(-82, -85, 516), + RSSI_TO_GRADE_LINE(-80, -83, 688), + RSSI_TO_GRADE_LINE(-77, -79, 1032), + RSSI_TO_GRADE_LINE(-73, -76, 1376), + RSSI_TO_GRADE_LINE(-70, -74, 1548), + RSSI_TO_GRADE_LINE(-69, -72, 1720), + RSSI_TO_GRADE_LINE(-65, -68, 2064), + RSSI_TO_GRADE_LINE(-61, -66, 2294), + RSSI_TO_GRADE_LINE(-58, -61, 2580), + RSSI_TO_GRADE_LINE(-55, -58, 2868), + RSSI_TO_GRADE_LINE(-46, -55, 3098), + RSSI_TO_GRADE_LINE(-43, -54, 3442) +}; + +#define MAX_GRADE (rssi_to_grade_map[ARRAY_SIZE(rssi_to_grade_map) - 1].grade) + +#define DEFAULT_CHAN_LOAD_2GHZ 30 +#define DEFAULT_CHAN_LOAD_5GHZ 15 +#define DEFAULT_CHAN_LOAD_6GHZ 0 + +/* Factors calculation is done with fixed-point with a scaling factor of 1/256 */ +#define SCALE_FACTOR 256 +#define MAX_CHAN_LOAD 256 + +static unsigned int +iwl_mld_get_n_subchannels(const struct ieee80211_bss_conf *link_conf) +{ + enum nl80211_chan_width chan_width = + link_conf->chanreq.oper.width; + int mhz = nl80211_chan_width_to_mhz(chan_width); + unsigned int n_subchannels; + + if (WARN_ONCE(mhz < 20 || mhz > 320, + "Invalid channel width : (%d)\n", mhz)) + return 1; + + /* total number of subchannels */ + n_subchannels = mhz / 20; + + /* No puncturing if less than 80 MHz */ + if (mhz >= 80) + n_subchannels -= hweight16(link_conf->chanreq.oper.punctured); + + return n_subchannels; +} + +static int +iwl_mld_get_chan_load_from_element(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf) +{ + struct ieee80211_vif *vif = link_conf->vif; + const struct cfg80211_bss_ies *ies; + const struct element *bss_load_elem = NULL; + const struct ieee80211_bss_load_elem *bss_load; + + guard(rcu)(); + + if (ieee80211_vif_link_active(vif, link_conf->link_id)) + ies = rcu_dereference(link_conf->bss->beacon_ies); + else + ies = rcu_dereference(link_conf->bss->ies); + + if (ies) + bss_load_elem = cfg80211_find_elem(WLAN_EID_QBSS_LOAD, + ies->data, ies->len); + + if (!bss_load_elem || + bss_load_elem->datalen != sizeof(*bss_load)) + return -EINVAL; + + bss_load = (const void *)bss_load_elem->data; + + return bss_load->channel_util; +} + +static unsigned int +iwl_mld_get_chan_load_by_us(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf, + bool expect_active_link) +{ + struct iwl_mld_link *mld_link = iwl_mld_link_from_mac80211(link_conf); + struct ieee80211_chanctx_conf *chan_ctx; + struct iwl_mld_phy *phy; + + if (!mld_link || !mld_link->active) { + WARN_ON(expect_active_link); + return 0; + } + + if (WARN_ONCE(!rcu_access_pointer(mld_link->chan_ctx), + "Active link (%u) without channel ctxt assigned!\n", + link_conf->link_id)) + return 0; + + chan_ctx = wiphy_dereference(mld->wiphy, mld_link->chan_ctx); + phy = iwl_mld_phy_from_mac80211(chan_ctx); + + return phy->channel_load_by_us; +} + +/* Returns error if the channel utilization element is invalid/unavailable */ +int iwl_mld_get_chan_load_by_others(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf, + bool expect_active_link) +{ + int chan_load; + unsigned int chan_load_by_us; + + /* get overall load */ + chan_load = iwl_mld_get_chan_load_from_element(mld, link_conf); + if (chan_load < 0) + return chan_load; + + chan_load_by_us = iwl_mld_get_chan_load_by_us(mld, link_conf, + expect_active_link); + + /* channel load by us is given in percentage */ + chan_load_by_us = + NORMALIZE_PERCENT_TO_255(chan_load_by_us); + + /* Use only values that firmware sends that can possibly be valid */ + if (chan_load_by_us <= chan_load) + chan_load -= chan_load_by_us; + + return chan_load; +} + +static unsigned int +iwl_mld_get_default_chan_load(struct ieee80211_bss_conf *link_conf) +{ + enum nl80211_band band = link_conf->chanreq.oper.chan->band; + + switch (band) { + case NL80211_BAND_2GHZ: + return DEFAULT_CHAN_LOAD_2GHZ; + case NL80211_BAND_5GHZ: + return DEFAULT_CHAN_LOAD_5GHZ; + case NL80211_BAND_6GHZ: + return DEFAULT_CHAN_LOAD_6GHZ; + default: + WARN_ON(1); + return 0; + } +} + +unsigned int iwl_mld_get_chan_load(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf) +{ + int chan_load; + + chan_load = iwl_mld_get_chan_load_by_others(mld, link_conf, false); + if (chan_load >= 0) + return chan_load; + + /* No information from the element, take the defaults */ + chan_load = iwl_mld_get_default_chan_load(link_conf); + + /* The defaults are given in percentage */ + return NORMALIZE_PERCENT_TO_255(chan_load); +} + +static unsigned int +iwl_mld_get_avail_chan_load(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf) +{ + return MAX_CHAN_LOAD - iwl_mld_get_chan_load(mld, link_conf); +} + +/* This function calculates the grade of a link. Returns 0 in error case */ +unsigned int iwl_mld_get_link_grade(struct iwl_mld *mld, + struct ieee80211_bss_conf *link_conf) +{ + enum nl80211_band band; + int rssi_idx; + s32 link_rssi; + unsigned int grade = MAX_GRADE; + + if (WARN_ON_ONCE(!link_conf)) + return 0; + + band = link_conf->chanreq.oper.chan->band; + if (WARN_ONCE(band != NL80211_BAND_2GHZ && + band != NL80211_BAND_5GHZ && + band != NL80211_BAND_6GHZ, + "Invalid band (%u)\n", band)) + return 0; + + link_rssi = MBM_TO_DBM(link_conf->bss->signal); + /* + * For 6 GHz the RSSI of the beacons is lower than + * the RSSI of the data. + */ + if (band == NL80211_BAND_6GHZ && link_rssi) + link_rssi += 4; + + rssi_idx = band == NL80211_BAND_2GHZ ? 0 : 1; + + /* No valid RSSI - take the lowest grade */ + if (!link_rssi) + link_rssi = rssi_to_grade_map[0].rssi[rssi_idx]; + + IWL_DEBUG_EHT(mld, + "Calculating grade of link %d: band = %d, bandwidth = %d, punctured subchannels =0x%x RSSI = %d\n", + link_conf->link_id, band, + link_conf->chanreq.oper.width, + link_conf->chanreq.oper.punctured, link_rssi); + + /* Get grade based on RSSI */ + for (int i = 0; i < ARRAY_SIZE(rssi_to_grade_map); i++) { + const struct iwl_mld_rssi_to_grade *line = + &rssi_to_grade_map[i]; + + if (link_rssi > line->rssi[rssi_idx]) + continue; + grade = line->grade; + break; + } + + /* Apply the channel load and puncturing factors */ + grade = grade * iwl_mld_get_avail_chan_load(mld, link_conf) / SCALE_FACTOR; + grade = grade * iwl_mld_get_n_subchannels(link_conf); + + IWL_DEBUG_EHT(mld, "Link %d's grade: %d\n", link_conf->link_id, grade); + + return grade; +} +EXPORT_SYMBOL_IF_IWLWIFI_KUNIT(iwl_mld_get_link_grade); + +void iwl_mld_handle_beacon_filter_notif(struct iwl_mld *mld, + struct iwl_rx_packet *pkt) +{ + const struct iwl_beacon_filter_notif *notif = (const void *)pkt->data; + u32 link_id = le32_to_cpu(notif->link_id); + struct ieee80211_bss_conf *link_conf = + iwl_mld_fw_id_to_link_conf(mld, link_id); + struct iwl_mld_link *mld_link; + + if (IWL_FW_CHECK(mld, !link_conf, "invalid link ID %d\n", link_id)) + return; + + mld_link = iwl_mld_link_from_mac80211(link_conf); + if (WARN_ON_ONCE(!mld_link)) + return; + + mld_link->average_beacon_energy = le32_to_cpu(notif->average_energy); +} |