From: Ilan Peer <ilan.peer@xxxxxxxxx> [ Upstream commit 44b72ca8163b8cf94384a11fdec716f5478411bf ] 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@xxxxxxxxx> Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx> Link: https://lore.kernel.org/r/iwlwifi.20201206145305.600d967fe3c9.I48305f25cfcc9c032c77c51396e9e9b882748a86@changeid Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- net/mac80211/chan.c | 61 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c index 6a25be5eb1e7e..9d8d3d6eec9af 100644 --- a/net/mac80211/chan.c +++ b/net/mac80211/chan.c @@ -8,6 +8,7 @@ #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) @@ -339,10 +340,42 @@ 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; @@ -350,7 +383,25 @@ 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); @@ -358,6 +409,9 @@ 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 * @@ -1040,8 +1094,14 @@ 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; @@ -1432,6 +1492,7 @@ 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) { -- 2.27.0
