| /* | |
| * VHT handling | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| #include <linux/ieee80211.h> | |
| #include <linux/export.h> | |
| #include <net/mac80211.h> | |
| #include "ieee80211_i.h" | |
| #include "rate.h" | |
| static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata, | |
| struct ieee80211_sta_vht_cap *vht_cap, | |
| u32 flag) | |
| { | |
| __le32 le_flag = cpu_to_le32(flag); | |
| if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag && | |
| !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag)) | |
| vht_cap->cap &= ~flag; | |
| } | |
| void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata, | |
| struct ieee80211_sta_vht_cap *vht_cap) | |
| { | |
| int i; | |
| u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n; | |
| if (!vht_cap->vht_supported) | |
| return; | |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) | |
| return; | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_RXLDPC); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_SHORT_GI_80); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_SHORT_GI_160); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_TXSTBC); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN); | |
| __check_vhtcap_disable(sdata, vht_cap, | |
| IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN); | |
| /* Allow user to decrease AMPDU length exponent */ | |
| if (sdata->u.mgd.vht_capa_mask.vht_cap_info & | |
| cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) { | |
| u32 cap, n; | |
| n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) & | |
| IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
| n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
| cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
| cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
| if (n < cap) { | |
| vht_cap->cap &= | |
| ~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK; | |
| vht_cap->cap |= | |
| n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT; | |
| } | |
| } | |
| /* Allow the user to decrease MCSes */ | |
| rxmcs_mask = | |
| le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map); | |
| rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map); | |
| rxmcs_n &= rxmcs_mask; | |
| rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); | |
| txmcs_mask = | |
| le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map); | |
| txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map); | |
| txmcs_n &= txmcs_mask; | |
| txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); | |
| for (i = 0; i < 8; i++) { | |
| u8 m, n, c; | |
| m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || | |
| n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { | |
| rxmcs_cap &= ~(3 << 2*i); | |
| rxmcs_cap |= (rxmcs_n & (3 << 2*i)); | |
| } | |
| m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) || | |
| n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) { | |
| txmcs_cap &= ~(3 << 2*i); | |
| txmcs_cap |= (txmcs_n & (3 << 2*i)); | |
| } | |
| } | |
| vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap); | |
| vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap); | |
| } | |
| void | |
| ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata, | |
| struct ieee80211_supported_band *sband, | |
| const struct ieee80211_vht_cap *vht_cap_ie, | |
| struct sta_info *sta) | |
| { | |
| struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap; | |
| struct ieee80211_sta_vht_cap own_cap; | |
| u32 cap_info, i; | |
| memset(vht_cap, 0, sizeof(*vht_cap)); | |
| if (!sta->sta.ht_cap.ht_supported) | |
| return; | |
| if (!vht_cap_ie || !sband->vht_cap.vht_supported) | |
| return; | |
| /* A VHT STA must support 40 MHz */ | |
| if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) | |
| return; | |
| vht_cap->vht_supported = true; | |
| own_cap = sband->vht_cap; | |
| /* | |
| * If user has specified capability overrides, take care | |
| * of that if the station we're setting up is the AP that | |
| * we advertised a restricted capability set to. Override | |
| * our own capabilities and then use those below. | |
| */ | |
| if (sdata->vif.type == NL80211_IFTYPE_STATION && | |
| !test_sta_flag(sta, WLAN_STA_TDLS_PEER)) | |
| ieee80211_apply_vhtcap_overrides(sdata, &own_cap); | |
| /* take some capabilities as-is */ | |
| cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info); | |
| vht_cap->cap = cap_info; | |
| vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 | | |
| IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 | | |
| IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | | |
| IEEE80211_VHT_CAP_RXLDPC | | |
| IEEE80211_VHT_CAP_VHT_TXOP_PS | | |
| IEEE80211_VHT_CAP_HTC_VHT | | |
| IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK | | |
| IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB | | |
| IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB | | |
| IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN | | |
| IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN; | |
| /* and some based on our own capabilities */ | |
| switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { | |
| case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: | |
| vht_cap->cap |= cap_info & | |
| IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ; | |
| break; | |
| case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: | |
| vht_cap->cap |= cap_info & | |
| IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; | |
| break; | |
| default: | |
| /* nothing */ | |
| break; | |
| } | |
| /* symmetric capabilities */ | |
| vht_cap->cap |= cap_info & own_cap.cap & | |
| (IEEE80211_VHT_CAP_SHORT_GI_80 | | |
| IEEE80211_VHT_CAP_SHORT_GI_160); | |
| /* remaining ones */ | |
| if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE) { | |
| vht_cap->cap |= cap_info & | |
| (IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE | | |
| IEEE80211_VHT_CAP_BEAMFORMER_ANTENNAS_MAX | | |
| IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MAX); | |
| } | |
| if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE) | |
| vht_cap->cap |= cap_info & | |
| IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE; | |
| if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE) | |
| vht_cap->cap |= cap_info & | |
| IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE; | |
| if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) | |
| vht_cap->cap |= cap_info & | |
| IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE; | |
| if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC) | |
| vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK; | |
| if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK) | |
| vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC; | |
| /* Copy peer MCS info, the driver might need them. */ | |
| memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs, | |
| sizeof(struct ieee80211_vht_mcs_info)); | |
| /* but also restrict MCSes */ | |
| for (i = 0; i < 8; i++) { | |
| u16 own_rx, own_tx, peer_rx, peer_tx; | |
| own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map); | |
| own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map); | |
| own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map); | |
| peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map); | |
| peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
| if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED) | |
| peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| else if (own_rx < peer_tx) | |
| peer_tx = own_rx; | |
| } | |
| if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
| if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED) | |
| peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED; | |
| else if (own_tx < peer_rx) | |
| peer_rx = own_tx; | |
| } | |
| vht_cap->vht_mcs.rx_mcs_map &= | |
| ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); | |
| vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2); | |
| vht_cap->vht_mcs.tx_mcs_map &= | |
| ~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2); | |
| vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2); | |
| } | |
| /* finally set up the bandwidth */ | |
| switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) { | |
| case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ: | |
| case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
| break; | |
| default: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
| } | |
| sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta); | |
| } | |
| enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta) | |
| { | |
| struct ieee80211_sub_if_data *sdata = sta->sdata; | |
| u32 cap = sta->sta.vht_cap.cap; | |
| enum ieee80211_sta_rx_bandwidth bw; | |
| if (!sta->sta.vht_cap.vht_supported) { | |
| bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
| IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; | |
| goto check_max; | |
| } | |
| switch (sdata->vif.bss_conf.chandef.width) { | |
| default: | |
| WARN_ON_ONCE(1); | |
| /* fall through */ | |
| case NL80211_CHAN_WIDTH_20_NOHT: | |
| case NL80211_CHAN_WIDTH_20: | |
| case NL80211_CHAN_WIDTH_40: | |
| bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? | |
| IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; | |
| break; | |
| case NL80211_CHAN_WIDTH_160: | |
| if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == | |
| IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) { | |
| bw = IEEE80211_STA_RX_BW_160; | |
| break; | |
| } | |
| /* fall through */ | |
| case NL80211_CHAN_WIDTH_80P80: | |
| if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) == | |
| IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) { | |
| bw = IEEE80211_STA_RX_BW_160; | |
| break; | |
| } | |
| /* fall through */ | |
| case NL80211_CHAN_WIDTH_80: | |
| bw = IEEE80211_STA_RX_BW_80; | |
| } | |
| check_max: | |
| if (bw > sta->cur_max_bandwidth) | |
| bw = sta->cur_max_bandwidth; | |
| return bw; | |
| } | |
| void ieee80211_sta_set_rx_nss(struct sta_info *sta) | |
| { | |
| u8 ht_rx_nss = 0, vht_rx_nss = 0; | |
| /* if we received a notification already don't overwrite it */ | |
| if (sta->sta.rx_nss) | |
| return; | |
| if (sta->sta.ht_cap.ht_supported) { | |
| if (sta->sta.ht_cap.mcs.rx_mask[0]) | |
| ht_rx_nss++; | |
| if (sta->sta.ht_cap.mcs.rx_mask[1]) | |
| ht_rx_nss++; | |
| if (sta->sta.ht_cap.mcs.rx_mask[2]) | |
| ht_rx_nss++; | |
| if (sta->sta.ht_cap.mcs.rx_mask[3]) | |
| ht_rx_nss++; | |
| /* FIXME: consider rx_highest? */ | |
| } | |
| if (sta->sta.vht_cap.vht_supported) { | |
| int i; | |
| u16 rx_mcs_map; | |
| rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map); | |
| for (i = 7; i >= 0; i--) { | |
| u8 mcs = (rx_mcs_map >> (2 * i)) & 3; | |
| if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) { | |
| vht_rx_nss = i + 1; | |
| break; | |
| } | |
| } | |
| /* FIXME: consider rx_highest? */ | |
| } | |
| ht_rx_nss = max(ht_rx_nss, vht_rx_nss); | |
| sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss); | |
| } | |
| void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata, | |
| struct sta_info *sta, u8 opmode, | |
| enum ieee80211_band band, bool nss_only) | |
| { | |
| struct ieee80211_local *local = sdata->local; | |
| struct ieee80211_supported_band *sband; | |
| enum ieee80211_sta_rx_bandwidth new_bw; | |
| u32 changed = 0; | |
| u8 nss; | |
| sband = local->hw.wiphy->bands[band]; | |
| /* ignore - no support for BF yet */ | |
| if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF) | |
| return; | |
| nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK; | |
| nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT; | |
| nss += 1; | |
| if (sta->sta.rx_nss != nss) { | |
| sta->sta.rx_nss = nss; | |
| changed |= IEEE80211_RC_NSS_CHANGED; | |
| } | |
| if (nss_only) | |
| goto change; | |
| switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) { | |
| case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20; | |
| break; | |
| case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40; | |
| break; | |
| case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80; | |
| break; | |
| case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ: | |
| sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160; | |
| break; | |
| } | |
| new_bw = ieee80211_sta_cur_vht_bw(sta); | |
| if (new_bw != sta->sta.bandwidth) { | |
| sta->sta.bandwidth = new_bw; | |
| changed |= IEEE80211_RC_BW_CHANGED; | |
| } | |
| change: | |
| if (changed) | |
| rate_control_rate_update(local, sband, sta, changed); | |
| } |