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linux/net/mac80211/he.c
Johannes Berg da7f40c05c wifi: mac80211: add some support for RX OMI power saving 
In order to save power, it can be desirable to change the
RX operating mode using OMI to reduce the bandwidth. As the
handshake must be done in the HTC+ field, it cannot be done
by mac80211 directly, so expose functions to the driver to
request and finalize the necessary updates.

Note that RX OMI really only changes what the peer (AP) will
transmit to us, but in order to use it to actually save some
power (by reducing the listen bandwidth) we also update rate
scaling and then the channel context's mindef accordingly.

The updates are split into two in order to sequence them
correctly, when reducing bandwidth first reduce the rate
scaling and thus TX, then send OMI, then reduce the listen
bandwidth (chandef); when increasing bandwidth this is the
other way around. This also requires tracking in different
variables which part is applicable already.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250101070249.2c1a1934bd73.I4e90fd503504e37f9eac5bdae62e3f07e7071275@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2025-01-13 15:26:43 +01:00

368 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* HE handling
*
* Copyright(c) 2017 Intel Deutschland GmbH
* Copyright(c) 2019 - 2024 Intel Corporation
*/
#include "ieee80211_i.h"
#include "rate.h"
static void
ieee80211_update_from_he_6ghz_capa(const struct ieee80211_he_6ghz_capa *he_6ghz_capa,
struct link_sta_info *link_sta)
{
struct sta_info *sta = link_sta->sta;
enum ieee80211_smps_mode smps_mode;
if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
switch (le16_get_bits(he_6ghz_capa->capa,
IEEE80211_HE_6GHZ_CAP_SM_PS)) {
case WLAN_HT_CAP_SM_PS_INVALID:
case WLAN_HT_CAP_SM_PS_STATIC:
smps_mode = IEEE80211_SMPS_STATIC;
break;
case WLAN_HT_CAP_SM_PS_DYNAMIC:
smps_mode = IEEE80211_SMPS_DYNAMIC;
break;
case WLAN_HT_CAP_SM_PS_DISABLED:
smps_mode = IEEE80211_SMPS_OFF;
break;
}
link_sta->pub->smps_mode = smps_mode;
} else {
link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
}
switch (le16_get_bits(he_6ghz_capa->capa,
IEEE80211_HE_6GHZ_CAP_MAX_MPDU_LEN)) {
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
default:
link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
break;
}
ieee80211_sta_recalc_aggregates(&sta->sta);
link_sta->pub->he_6ghz_capa = *he_6ghz_capa;
}
static void ieee80211_he_mcs_disable(__le16 *he_mcs)
{
u32 i;
for (i = 0; i < 8; i++)
*he_mcs |= cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
}
static void ieee80211_he_mcs_intersection(__le16 *he_own_rx, __le16 *he_peer_rx,
__le16 *he_own_tx, __le16 *he_peer_tx)
{
u32 i;
u16 own_rx, own_tx, peer_rx, peer_tx;
for (i = 0; i < 8; i++) {
own_rx = le16_to_cpu(*he_own_rx);
own_rx = (own_rx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
own_tx = le16_to_cpu(*he_own_tx);
own_tx = (own_tx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
peer_rx = le16_to_cpu(*he_peer_rx);
peer_rx = (peer_rx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
peer_tx = le16_to_cpu(*he_peer_tx);
peer_tx = (peer_tx >> i * 2) & IEEE80211_HE_MCS_NOT_SUPPORTED;
if (peer_tx != IEEE80211_HE_MCS_NOT_SUPPORTED) {
if (own_rx == IEEE80211_HE_MCS_NOT_SUPPORTED)
peer_tx = IEEE80211_HE_MCS_NOT_SUPPORTED;
else if (own_rx < peer_tx)
peer_tx = own_rx;
}
if (peer_rx != IEEE80211_HE_MCS_NOT_SUPPORTED) {
if (own_tx == IEEE80211_HE_MCS_NOT_SUPPORTED)
peer_rx = IEEE80211_HE_MCS_NOT_SUPPORTED;
else if (own_tx < peer_rx)
peer_rx = own_tx;
}
*he_peer_rx &=
~cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
*he_peer_rx |= cpu_to_le16(peer_rx << i * 2);
*he_peer_tx &=
~cpu_to_le16(IEEE80211_HE_MCS_NOT_SUPPORTED << i * 2);
*he_peer_tx |= cpu_to_le16(peer_tx << i * 2);
}
}
void
ieee80211_he_cap_ie_to_sta_he_cap(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
const u8 *he_cap_ie, u8 he_cap_len,
const struct ieee80211_he_6ghz_capa *he_6ghz_capa,
struct link_sta_info *link_sta)
{
struct ieee80211_sta_he_cap *he_cap = &link_sta->pub->he_cap;
const struct ieee80211_sta_he_cap *own_he_cap_ptr;
struct ieee80211_sta_he_cap own_he_cap;
struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
u8 he_ppe_size;
u8 mcs_nss_size;
u8 he_total_size;
bool own_160, peer_160, own_80p80, peer_80p80;
memset(he_cap, 0, sizeof(*he_cap));
if (!he_cap_ie)
return;
own_he_cap_ptr =
ieee80211_get_he_iftype_cap_vif(sband, &sdata->vif);
if (!own_he_cap_ptr)
return;
own_he_cap = *own_he_cap_ptr;
/* Make sure size is OK */
mcs_nss_size = ieee80211_he_mcs_nss_size(he_cap_ie_elem);
he_ppe_size =
ieee80211_he_ppe_size(he_cap_ie[sizeof(he_cap->he_cap_elem) +
mcs_nss_size],
he_cap_ie_elem->phy_cap_info);
he_total_size = sizeof(he_cap->he_cap_elem) + mcs_nss_size +
he_ppe_size;
if (he_cap_len < he_total_size)
return;
memcpy(&he_cap->he_cap_elem, he_cap_ie, sizeof(he_cap->he_cap_elem));
/* HE Tx/Rx HE MCS NSS Support Field */
memcpy(&he_cap->he_mcs_nss_supp,
&he_cap_ie[sizeof(he_cap->he_cap_elem)], mcs_nss_size);
/* Check if there are (optional) PPE Thresholds */
if (he_cap->he_cap_elem.phy_cap_info[6] &
IEEE80211_HE_PHY_CAP6_PPE_THRESHOLD_PRESENT)
memcpy(he_cap->ppe_thres,
&he_cap_ie[sizeof(he_cap->he_cap_elem) + mcs_nss_size],
he_ppe_size);
he_cap->has_he = true;
link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
if (sband->band == NL80211_BAND_6GHZ && he_6ghz_capa)
ieee80211_update_from_he_6ghz_capa(he_6ghz_capa, link_sta);
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80,
&he_cap->he_mcs_nss_supp.rx_mcs_80,
&own_he_cap.he_mcs_nss_supp.tx_mcs_80,
&he_cap->he_mcs_nss_supp.tx_mcs_80);
own_160 = own_he_cap.he_cap_elem.phy_cap_info[0] &
IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
peer_160 = he_cap->he_cap_elem.phy_cap_info[0] &
IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
if (peer_160 && own_160) {
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_160,
&he_cap->he_mcs_nss_supp.rx_mcs_160,
&own_he_cap.he_mcs_nss_supp.tx_mcs_160,
&he_cap->he_mcs_nss_supp.tx_mcs_160);
} else if (peer_160 && !own_160) {
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_160);
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_160);
he_cap->he_cap_elem.phy_cap_info[0] &=
~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_160MHZ_IN_5G;
}
own_80p80 = own_he_cap.he_cap_elem.phy_cap_info[0] &
IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
peer_80p80 = he_cap->he_cap_elem.phy_cap_info[0] &
IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
if (peer_80p80 && own_80p80) {
ieee80211_he_mcs_intersection(&own_he_cap.he_mcs_nss_supp.rx_mcs_80p80,
&he_cap->he_mcs_nss_supp.rx_mcs_80p80,
&own_he_cap.he_mcs_nss_supp.tx_mcs_80p80,
&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
} else if (peer_80p80 && !own_80p80) {
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.rx_mcs_80p80);
ieee80211_he_mcs_disable(&he_cap->he_mcs_nss_supp.tx_mcs_80p80);
he_cap->he_cap_elem.phy_cap_info[0] &=
~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_80PLUS80_MHZ_IN_5G;
}
}
void
ieee80211_he_op_ie_to_bss_conf(struct ieee80211_vif *vif,
const struct ieee80211_he_operation *he_op_ie)
{
memset(&vif->bss_conf.he_oper, 0, sizeof(vif->bss_conf.he_oper));
if (!he_op_ie)
return;
vif->bss_conf.he_oper.params = __le32_to_cpu(he_op_ie->he_oper_params);
vif->bss_conf.he_oper.nss_set = __le16_to_cpu(he_op_ie->he_mcs_nss_set);
}
void
ieee80211_he_spr_ie_to_bss_conf(struct ieee80211_vif *vif,
const struct ieee80211_he_spr *he_spr_ie_elem)
{
struct ieee80211_he_obss_pd *he_obss_pd =
&vif->bss_conf.he_obss_pd;
const u8 *data;
memset(he_obss_pd, 0, sizeof(*he_obss_pd));
if (!he_spr_ie_elem)
return;
he_obss_pd->sr_ctrl = he_spr_ie_elem->he_sr_control;
data = he_spr_ie_elem->optional;
if (he_spr_ie_elem->he_sr_control &
IEEE80211_HE_SPR_NON_SRG_OFFSET_PRESENT)
he_obss_pd->non_srg_max_offset = *data++;
if (he_spr_ie_elem->he_sr_control &
IEEE80211_HE_SPR_SRG_INFORMATION_PRESENT) {
he_obss_pd->min_offset = *data++;
he_obss_pd->max_offset = *data++;
memcpy(he_obss_pd->bss_color_bitmap, data, 8);
data += 8;
memcpy(he_obss_pd->partial_bssid_bitmap, data, 8);
he_obss_pd->enable = true;
}
}
static void ieee80211_link_sta_rc_update_omi(struct ieee80211_link_data *link,
struct link_sta_info *link_sta)
{
struct ieee80211_sub_if_data *sdata = link->sdata;
struct ieee80211_supported_band *sband;
enum ieee80211_sta_rx_bandwidth new_bw;
enum nl80211_band band;
band = link->conf->chanreq.oper.chan->band;
sband = sdata->local->hw.wiphy->bands[band];
new_bw = ieee80211_sta_cur_vht_bw(link_sta);
if (link_sta->pub->bandwidth == new_bw)
return;
link_sta->pub->bandwidth = new_bw;
rate_control_rate_update(sdata->local, sband, link_sta,
IEEE80211_RC_BW_CHANGED);
}
bool ieee80211_prepare_rx_omi_bw(struct ieee80211_link_sta *pub_link_sta,
enum ieee80211_sta_rx_bandwidth bw)
{
struct sta_info *sta = container_of(pub_link_sta->sta,
struct sta_info, sta);
struct ieee80211_local *local = sta->sdata->local;
struct link_sta_info *link_sta =
sdata_dereference(sta->link[pub_link_sta->link_id], sta->sdata);
struct ieee80211_link_data *link =
sdata_dereference(sta->sdata->link[pub_link_sta->link_id],
sta->sdata);
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *chanctx;
bool ret;
if (WARN_ON(!link || !link_sta || link_sta->pub != pub_link_sta))
return false;
conf = sdata_dereference(link->conf->chanctx_conf, sta->sdata);
if (WARN_ON(!conf))
return false;
trace_api_prepare_rx_omi_bw(local, sta->sdata, link_sta, bw);
chanctx = container_of(conf, typeof(*chanctx), conf);
if (link_sta->rx_omi_bw_staging == bw) {
ret = false;
goto trace;
}
/* must call this API in pairs */
if (WARN_ON(link_sta->rx_omi_bw_tx != link_sta->rx_omi_bw_staging ||
link_sta->rx_omi_bw_rx != link_sta->rx_omi_bw_staging)) {
ret = false;
goto trace;
}
if (bw < link_sta->rx_omi_bw_staging) {
link_sta->rx_omi_bw_tx = bw;
ieee80211_link_sta_rc_update_omi(link, link_sta);
} else {
link_sta->rx_omi_bw_rx = bw;
ieee80211_recalc_chanctx_min_def(local, chanctx, NULL, false);
}
link_sta->rx_omi_bw_staging = bw;
ret = true;
trace:
trace_api_return_bool(local, ret);
return ret;
}
EXPORT_SYMBOL_GPL(ieee80211_prepare_rx_omi_bw);
void ieee80211_finalize_rx_omi_bw(struct ieee80211_link_sta *pub_link_sta)
{
struct sta_info *sta = container_of(pub_link_sta->sta,
struct sta_info, sta);
struct ieee80211_local *local = sta->sdata->local;
struct link_sta_info *link_sta =
sdata_dereference(sta->link[pub_link_sta->link_id], sta->sdata);
struct ieee80211_link_data *link =
sdata_dereference(sta->sdata->link[pub_link_sta->link_id],
sta->sdata);
struct ieee80211_chanctx_conf *conf;
struct ieee80211_chanctx *chanctx;
if (WARN_ON(!link || !link_sta || link_sta->pub != pub_link_sta))
return;
conf = sdata_dereference(link->conf->chanctx_conf, sta->sdata);
if (WARN_ON(!conf))
return;
trace_api_finalize_rx_omi_bw(local, sta->sdata, link_sta);
chanctx = container_of(conf, typeof(*chanctx), conf);
if (link_sta->rx_omi_bw_tx != link_sta->rx_omi_bw_staging) {
/* rate control in finalize only when widening bandwidth */
WARN_ON(link_sta->rx_omi_bw_tx > link_sta->rx_omi_bw_staging);
link_sta->rx_omi_bw_tx = link_sta->rx_omi_bw_staging;
ieee80211_link_sta_rc_update_omi(link, link_sta);
}
if (link_sta->rx_omi_bw_rx != link_sta->rx_omi_bw_staging) {
/* channel context in finalize only when narrowing bandwidth */
WARN_ON(link_sta->rx_omi_bw_rx < link_sta->rx_omi_bw_staging);
link_sta->rx_omi_bw_rx = link_sta->rx_omi_bw_staging;
ieee80211_recalc_chanctx_min_def(local, chanctx, NULL, false);
}
trace_api_return_void(local);
}
EXPORT_SYMBOL_GPL(ieee80211_finalize_rx_omi_bw);
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