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1845c1d4a4
linux/net/mac80211/he.c
Johannes Berg c71420db65 wifi: mac80211: RCU-ify link STA pointers 
We need to be able to access these in a race-free way under
traffic while adding/removing them, so RCU-ify the pointers.
This requires passing a link_sta to a lot of functions so
we don't have to do the RCU handling everywhere.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2022-06-20 12:57:08 +02:00

239 lines
7.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* HE handling
*
* Copyright(c) 2017 Intel Deutschland GmbH
* Copyright(c) 2019 - 2022 Intel Corporation
*/
#include "ieee80211_i.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;
}
sta->sta.smps_mode = smps_mode;
} else {
sta->sta.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:
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
break;
case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
default:
sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
break;
}
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;
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 ||
!ieee80211_get_he_iftype_cap(sband,
ieee80211_vif_type_p2p(&sdata->vif)))
return;
own_he_cap = sband->iftype_data->he_cap;
/* 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;
data = he_spr_ie_elem->optional;
if (he_spr_ie_elem->he_sr_control &
IEEE80211_HE_SPR_NON_SRG_OFFSET_PRESENT)
data++;
if (he_spr_ie_elem->he_sr_control &
IEEE80211_HE_SPR_SRG_INFORMATION_PRESENT) {
he_obss_pd->max_offset = *data++;
he_obss_pd->min_offset = *data++;
he_obss_pd->enable = true;
}
}
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