@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* mac80211 - channel management
+ * Copyright 2020 - 2021 Intel Corporation
*/
#include <linux/nl80211.h>
@@ -308,8 +309,8 @@ ieee80211_get_chanctx_max_required_bw(struct ieee80211_local *local,
* the max of min required widths of all the interfaces bound to this
* channel context.
*/
-void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
- struct ieee80211_chanctx *ctx)
+static u32 _ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
{
enum nl80211_chan_width max_bw;
struct cfg80211_chan_def min_def;
@@ -326,7 +327,7 @@ void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
ctx->conf.radar_enabled) {
ctx->conf.min_def = ctx->conf.def;
- return;
+ return 0;
}
max_bw = ieee80211_get_chanctx_max_required_bw(local, &ctx->conf);
@@ -337,17 +338,21 @@ void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
ieee80211_chandef_downgrade(&min_def);
if (cfg80211_chandef_identical(&ctx->conf.min_def, &min_def))
- return;
+ return 0;
ctx->conf.min_def = min_def;
if (!ctx->driver_present)
- return;
+ return 0;
- drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
+ return IEEE80211_CHANCTX_CHANGE_MIN_WIDTH;
}
+/* calling this function is assuming that station vif is updated to
+ * lates changes by calling ieee80211_vif_update_chandef
+ */
static void ieee80211_chan_bw_change(struct ieee80211_local *local,
- struct ieee80211_chanctx *ctx)
+ struct ieee80211_chanctx *ctx,
+ bool narrowed)
{
struct sta_info *sta;
struct ieee80211_supported_band *sband =
@@ -366,9 +371,16 @@ static void ieee80211_chan_bw_change(struct ieee80211_local *local,
continue;
new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
+
+ /* nothing change */
if (new_sta_bw == sta->sta.bandwidth)
continue;
+ /* vif changed to narrow BW and narrow BW for station wasn't
+ * requested or vise versa */
+ if ((new_sta_bw < sta->sta.bandwidth) == !narrowed)
+ continue;
+
sta->sta.bandwidth = new_sta_bw;
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_BW_CHANGED);
@@ -376,21 +388,34 @@ static void ieee80211_chan_bw_change(struct ieee80211_local *local,
rcu_read_unlock();
}
-static void ieee80211_change_chanctx(struct ieee80211_local *local,
- struct ieee80211_chanctx *ctx,
- const struct cfg80211_chan_def *chandef)
+/*
+ * recalc the min required chan width of the channel context, which is
+ * the max of min required widths of all the interfaces bound to this
+ * channel context.
+ */
+void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx)
{
- enum nl80211_chan_width width;
+ u32 changed = _ieee80211_recalc_chanctx_min_def(local, ctx);
- if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
- ieee80211_recalc_chanctx_min_def(local, ctx);
+ if (!changed)
return;
- }
- WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
+ /* check is BW narrowed */
+ ieee80211_chan_bw_change(local, ctx, true);
- width = ctx->conf.def.width;
- ctx->conf.def = *chandef;
+ drv_change_chanctx(local, ctx, changed);
+
+ /* check is BW wider */
+ ieee80211_chan_bw_change(local, ctx, false);
+}
+
+static void ieee80211_change_chanctx(struct ieee80211_local *local,
+ struct ieee80211_chanctx *ctx,
+ struct ieee80211_chanctx *old_ctx,
+ const struct cfg80211_chan_def *chandef)
+{
+ u32 changed;
/* expected to handle only 20/40/80/160 channel widths */
switch (chandef->width) {
@@ -405,19 +430,33 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local,
WARN_ON(1);
}
- if (chandef->width < width)
- ieee80211_chan_bw_change(local, ctx);
+ /* Check maybe BW narrowed - we do this _before_ calling recalc_chanctx_min_def
+ * due to maybe not returning from it, e.g in case new context was added
+ * first time with all parameters up to date.
+ */
+ ieee80211_chan_bw_change(local, old_ctx, true);
+
+ if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
+ ieee80211_recalc_chanctx_min_def(local, ctx);
+ return;
+ }
- drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
- ieee80211_recalc_chanctx_min_def(local, ctx);
+ WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
+
+ ctx->conf.def = *chandef;
+
+ /* check if min chanctx also changed */
+ changed = IEEE80211_CHANCTX_CHANGE_WIDTH |
+ _ieee80211_recalc_chanctx_min_def(local, ctx);
+ drv_change_chanctx(local, ctx, changed);
if (!local->use_chanctx) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
- if (chandef->width > width)
- ieee80211_chan_bw_change(local, ctx);
+ /* check is BW wider */
+ ieee80211_chan_bw_change(local, old_ctx, false);
}
static struct ieee80211_chanctx *
@@ -450,7 +489,7 @@ ieee80211_find_chanctx(struct ieee80211_local *local,
if (!compat)
continue;
- ieee80211_change_chanctx(local, ctx, compat);
+ ieee80211_change_chanctx(local, ctx, ctx, compat);
return ctx;
}
@@ -679,7 +718,7 @@ void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
if (!compat)
return;
- ieee80211_change_chanctx(local, ctx, compat);
+ ieee80211_change_chanctx(local, ctx, ctx, compat);
}
static void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
@@ -1107,13 +1146,12 @@ ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
if (WARN_ON(!chandef))
return -EINVAL;
- if (old_ctx->conf.def.width > new_ctx->conf.def.width)
- ieee80211_chan_bw_change(local, new_ctx);
+ if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
+ changed = BSS_CHANGED_BANDWIDTH;
- ieee80211_change_chanctx(local, new_ctx, chandef);
+ ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
- if (old_ctx->conf.def.width < new_ctx->conf.def.width)
- ieee80211_chan_bw_change(local, new_ctx);
+ ieee80211_change_chanctx(local, new_ctx, old_ctx, chandef);
vif_chsw[0].vif = &sdata->vif;
vif_chsw[0].old_ctx = &old_ctx->conf;
@@ -1142,14 +1180,9 @@ ieee80211_vif_use_reserved_reassign(struct ieee80211_sub_if_data *sdata)
if (ieee80211_chanctx_refcount(local, old_ctx) == 0)
ieee80211_free_chanctx(local, old_ctx);
- if (sdata->vif.bss_conf.chandef.width != sdata->reserved_chandef.width)
- changed = BSS_CHANGED_BANDWIDTH;
-
- ieee80211_vif_update_chandef(sdata, &sdata->reserved_chandef);
-
+ ieee80211_recalc_chanctx_min_def(local, new_ctx);
ieee80211_recalc_smps_chanctx(local, new_ctx);
ieee80211_recalc_radar_chanctx(local, new_ctx);
- ieee80211_recalc_chanctx_min_def(local, new_ctx);
if (changed)
ieee80211_bss_info_change_notify(sdata, changed);
@@ -1188,7 +1221,7 @@ ieee80211_vif_use_reserved_assign(struct ieee80211_sub_if_data *sdata)
if (WARN_ON(!chandef))
return -EINVAL;
- ieee80211_change_chanctx(local, new_ctx, chandef);
+ ieee80211_change_chanctx(local, new_ctx, new_ctx, chandef);
list_del(&sdata->reserved_chanctx_list);
sdata->reserved_chanctx = NULL;
@@ -1505,7 +1538,6 @@ static int ieee80211_vif_use_reserved_switch(struct ieee80211_local *local)
ieee80211_recalc_smps_chanctx(local, ctx);
ieee80211_recalc_radar_chanctx(local, ctx);
ieee80211_recalc_chanctx_min_def(local, ctx);
- ieee80211_chan_bw_change(local, ctx);
list_for_each_entry_safe(sdata, sdata_tmp, &ctx->reserved_vifs,
reserved_chanctx_list) {
@@ -371,7 +371,6 @@ static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
struct cfg80211_chan_def chandef;
u16 ht_opmode;
u32 flags;
- enum ieee80211_sta_rx_bandwidth new_sta_bw;
u32 vht_cap_info = 0;
int ret;
@@ -450,35 +449,8 @@ static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
return -EINVAL;
}
- switch (chandef.width) {
- case NL80211_CHAN_WIDTH_20_NOHT:
- case NL80211_CHAN_WIDTH_20:
- new_sta_bw = IEEE80211_STA_RX_BW_20;
- break;
- case NL80211_CHAN_WIDTH_40:
- new_sta_bw = IEEE80211_STA_RX_BW_40;
- break;
- case NL80211_CHAN_WIDTH_80:
- new_sta_bw = IEEE80211_STA_RX_BW_80;
- break;
- case NL80211_CHAN_WIDTH_80P80:
- case NL80211_CHAN_WIDTH_160:
- new_sta_bw = IEEE80211_STA_RX_BW_160;
- break;
- default:
- return -EINVAL;
- }
-
- if (new_sta_bw > sta->cur_max_bandwidth)
- new_sta_bw = sta->cur_max_bandwidth;
-
- if (new_sta_bw < sta->sta.bandwidth) {
- sta->sta.bandwidth = new_sta_bw;
- rate_control_rate_update(local, sband, sta,
- IEEE80211_RC_BW_CHANGED);
- }
-
ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
+
if (ret) {
sdata_info(sdata,
"AP %pM changed bandwidth to incompatible one - disconnect\n",
@@ -486,12 +458,6 @@ static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
return ret;
}
- if (new_sta_bw > sta->sta.bandwidth) {
- sta->sta.bandwidth = new_sta_bw;
- rate_control_rate_update(local, sband, sta,
- IEEE80211_RC_BW_CHANGED);
- }
-
return 0;
}
@@ -1183,10 +1149,6 @@ static void ieee80211_chswitch_work(struct work_struct *work)
*/
if (sdata->reserved_chanctx) {
- struct ieee80211_supported_band *sband = NULL;
- struct sta_info *mgd_sta = NULL;
- enum ieee80211_sta_rx_bandwidth bw = IEEE80211_STA_RX_BW_20;
-
/*
* with multi-vif csa driver may call ieee80211_csa_finish()
* many times while waiting for other interfaces to use their
@@ -1195,48 +1157,6 @@ static void ieee80211_chswitch_work(struct work_struct *work)
if (sdata->reserved_ready)
goto out;
- if (sdata->vif.bss_conf.chandef.width !=
- sdata->csa_chandef.width) {
- /*
- * For managed interface, we need to also update the AP
- * station bandwidth and align the rate scale algorithm
- * on the bandwidth change. Here we only consider the
- * bandwidth of the new channel definition (as channel
- * switch flow does not have the full HT/VHT/HE
- * information), assuming that if additional changes are
- * required they would be done as part of the processing
- * of the next beacon from the AP.
- */
- switch (sdata->csa_chandef.width) {
- case NL80211_CHAN_WIDTH_20_NOHT:
- case NL80211_CHAN_WIDTH_20:
- default:
- bw = IEEE80211_STA_RX_BW_20;
- break;
- case NL80211_CHAN_WIDTH_40:
- bw = IEEE80211_STA_RX_BW_40;
- break;
- case NL80211_CHAN_WIDTH_80:
- bw = IEEE80211_STA_RX_BW_80;
- break;
- case NL80211_CHAN_WIDTH_80P80:
- case NL80211_CHAN_WIDTH_160:
- bw = IEEE80211_STA_RX_BW_160;
- break;
- }
-
- mgd_sta = sta_info_get(sdata, ifmgd->bssid);
- sband =
- local->hw.wiphy->bands[sdata->csa_chandef.chan->band];
- }
-
- if (sdata->vif.bss_conf.chandef.width >
- sdata->csa_chandef.width) {
- mgd_sta->sta.bandwidth = bw;
- rate_control_rate_update(local, sband, mgd_sta,
- IEEE80211_RC_BW_CHANGED);
- }
-
ret = ieee80211_vif_use_reserved_context(sdata);
if (ret) {
sdata_info(sdata,
@@ -1247,13 +1167,6 @@ static void ieee80211_chswitch_work(struct work_struct *work)
goto out;
}
- if (sdata->vif.bss_conf.chandef.width <
- sdata->csa_chandef.width) {
- mgd_sta->sta.bandwidth = bw;
- rate_control_rate_update(local, sband, mgd_sta,
- IEEE80211_RC_BW_CHANGED);
- }
-
goto out;
}