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mac80211: Update rate control on channel change 

A channel change or a channel bandwidth change can impact the
rate control logic. However, the rate control logic was not updated
before/after such a change, which might result in unexpected
behavior.

Fix this by updating the stations rate control logic when the
corresponding channel context changes.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20201206145305.600d967fe3c9.I48305f25cfcc9c032c77c51396e9e9b882748a86@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ilan Peer 2020-12-06 14:54:50 +02:00 committed by Johannes Berg
parent 189a164d0f
commit 44b72ca816
1 changed files with 61 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
net/mac80211/chan.c
View File

@ -9,6 +9,7 @@
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
#include "rate.h"
static int ieee80211_chanctx_num_assigned(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
@ -345,10 +346,42 @@ void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_MIN_WIDTH);
}
static void ieee80211_chan_bw_change(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx)
{
struct sta_info *sta;
struct ieee80211_supported_band *sband =
local->hw.wiphy->bands[ctx->conf.def.chan->band];
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list,
list) {
enum ieee80211_sta_rx_bandwidth new_sta_bw;
if (!ieee80211_sdata_running(sta->sdata))
continue;
if (rcu_access_pointer(sta->sdata->vif.chanctx_conf) !=
&ctx->conf)
continue;
new_sta_bw = ieee80211_sta_cur_vht_bw(sta);
if (new_sta_bw == sta->sta.bandwidth)
continue;
sta->sta.bandwidth = new_sta_bw;
rate_control_rate_update(local, sband, sta,
IEEE80211_RC_BW_CHANGED);
}
rcu_read_unlock();
}
static void ieee80211_change_chanctx(struct ieee80211_local *local,
struct ieee80211_chanctx *ctx,
const struct cfg80211_chan_def *chandef)
{
enum nl80211_chan_width width;
if (cfg80211_chandef_identical(&ctx->conf.def, chandef)) {
ieee80211_recalc_chanctx_min_def(local, ctx);
return;
@ -356,7 +389,25 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local,
WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
width = ctx->conf.def.width;
ctx->conf.def = *chandef;
/* expected to handle only 20/40/80/160 channel widths */
switch (chandef->width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_40:
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_160:
break;
default:
WARN_ON(1);
}
if (chandef->width < width)
ieee80211_chan_bw_change(local, ctx);
drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
ieee80211_recalc_chanctx_min_def(local, ctx);
@ -364,6 +415,9 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local,
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
if (chandef->width > width)
ieee80211_chan_bw_change(local, ctx);
}
static struct ieee80211_chanctx *
@ -1053,8 +1107,14 @@ 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);
ieee80211_change_chanctx(local, new_ctx, chandef);
if (old_ctx->conf.def.width < new_ctx->conf.def.width)
ieee80211_chan_bw_change(local, new_ctx);
vif_chsw[0].vif = &sdata->vif;
vif_chsw[0].old_ctx = &old_ctx->conf;
vif_chsw[0].new_ctx = &new_ctx->conf;
@ -1445,6 +1505,7 @@ 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) {