From c7a6ee27abd46247c1c7edfc49fb935138da7875 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 12 Dec 2012 17:50:39 +0100 Subject: cfg80211: allow drivers to selectively disable 80/160 MHz Some drivers might support 80 or 160 MHz only on some channels for whatever reason, so allow them to disable these channel widths. Also maintain the new flags when regulatory bandwidth limitations would disable these wide channels. Reviewed-by: Luis R. Rodriguez Signed-off-by: Johannes Berg --- net/wireless/chan.c | 13 ++++++++++++- net/wireless/reg.c | 8 ++++++++ 2 files changed, 20 insertions(+), 1 deletion(-) (limited to 'net/wireless') diff --git a/net/wireless/chan.c b/net/wireless/chan.c index 810c23cfb89..fd556ac05fd 100644 --- a/net/wireless/chan.c +++ b/net/wireless/chan.c @@ -375,6 +375,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, case NL80211_CHAN_WIDTH_80: if (!vht_cap->vht_supported) return false; + prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; width = 80; break; case NL80211_CHAN_WIDTH_160: @@ -382,6 +383,7 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, return false; if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)) return false; + prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; width = 160; break; default: @@ -389,7 +391,16 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy, return false; } - /* TODO: missing regulatory check on 80/160 bandwidth */ + /* + * TODO: What if there are only certain 80/160/80+80 MHz channels + * allowed by the driver, or only certain combinations? + * For 40 MHz the driver can set the NO_HT40 flags, but for + * 80/160 MHz and in particular 80+80 MHz this isn't really + * feasible and we only have NO_80MHZ/NO_160MHZ so far but + * no way to cover 80+80 MHz or more complex restrictions. + * Note that such restrictions also need to be advertised to + * userspace, for example for P2P channel selection. + */ if (width > 20) prohibited_flags |= IEEE80211_CHAN_NO_OFDM; diff --git a/net/wireless/reg.c b/net/wireless/reg.c index e97d5b071ab..93ab840957a 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -866,6 +866,10 @@ static void handle_channel(struct wiphy *wiphy, if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) bw_flags = IEEE80211_CHAN_NO_HT40; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80)) + bw_flags |= IEEE80211_CHAN_NO_80MHZ; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160)) + bw_flags |= IEEE80211_CHAN_NO_160MHZ; if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER && request_wiphy && request_wiphy == wiphy && @@ -1264,6 +1268,10 @@ static void handle_channel_custom(struct wiphy *wiphy, if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(40)) bw_flags = IEEE80211_CHAN_NO_HT40; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(80)) + bw_flags |= IEEE80211_CHAN_NO_80MHZ; + if (freq_range->max_bandwidth_khz < MHZ_TO_KHZ(160)) + bw_flags |= IEEE80211_CHAN_NO_160MHZ; chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags; chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain); -- cgit v1.2.3