80MHz Regulatory changes for 11ac.
Signed-off-by: Mahesh Palivela <maheshp@xxxxxxxxxxx>
---
include/net/cfg80211.h | 8 +++++
net/wireless/reg.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 84 insertions(+), 0 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 493fa0c..bde0fee 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -104,10 +104,18 @@ enum ieee80211_channel_flags {
IEEE80211_CHAN_RADAR = 1<<3,
IEEE80211_CHAN_NO_HT40PLUS = 1<<4,
IEEE80211_CHAN_NO_HT40MINUS = 1<<5,
+ IEEE80211_CHAN_NO_VHT80PLUS = 1<<6,
+ IEEE80211_CHAN_NO_VHT80MINUS = 1<<7,
+ IEEE80211_CHAN_NO_VHT160PLUS = 1<<8,
+ IEEE80211_CHAN_NO_VHT160MINUS = 1<<9,
};
#define IEEE80211_CHAN_NO_HT40 \
(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
+#define IEEE80211_CHAN_NO_VHT80 \
+ (IEEE80211_CHAN_NO_VHT80PLUS | IEEE80211_CHAN_NO_VHT80MINUS)
+#define IEEE80211_CHAN_NO_VHT160 \
+ (IEEE80211_CHAN_NO_VHT160PLUS | IEEE80211_CHAN_NO_VHT160MINUS)
/**
* struct ieee80211_channel - channel definition
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2303ee7..0ad6c15 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1124,6 +1124,81 @@ static void reg_process_beacons(struct wiphy *wiphy)
wiphy_update_beacon_reg(wiphy);
}
+static bool is_vht80_not_allowed(struct ieee80211_channel *chan)
+{
+ if (!chan)
+ return true;
+ if (chan->flags & IEEE80211_CHAN_DISABLED)
+ return true;
+ /* This would happen when regulatory rules disallow VHT80 completely */
+ if (IEEE80211_CHAN_NO_VHT80 == (chan->flags & (IEEE80211_CHAN_NO_VHT80)))
+ return true;
+ return false;
+}
+
+static void reg_process_vht_flags_channel(struct wiphy *wiphy,
+ unsigned int chan_idx)
+{
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_channel *channel;
+ struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
+ unsigned int i;
+
+ assert_cfg80211_lock();
+
+ sband = wiphy->bands[IEEE80211_BAND_5GHZ];
+ BUG_ON(chan_idx >= sband->n_channels);
+ channel = &sband->channels[chan_idx];
+
+ if (is_vht80_not_allowed(channel)) {
+ channel->flags |= IEEE80211_CHAN_NO_VHT80;
+ return;
+ }
+
+ /*
+ * We need to ensure the extension channels exist to
+ * be able to use VHT80- or VHT80+, this finds them (or not)
+ */
+ for (i = 0; i < sband->n_channels; i++) {
+ struct ieee80211_channel *c = &sband->channels[i];
+ if (c->center_freq == (channel->center_freq - 40))
+ channel_before = c;
+ if (c->center_freq == (channel->center_freq + 40))
+ channel_after = c;
+ }
+
+ /*
+ * Please note that this assumes target bandwidth is 40 MHz,
+ * if that ever changes we also need to change the below logic
+ * to include that as well.
+ */
+ if (is_vht80_not_allowed(channel_before))
+ channel->flags |= IEEE80211_CHAN_NO_VHT80MINUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_VHT80MINUS;
+
+ if (is_vht80_not_allowed(channel_after))
+ channel->flags |= IEEE80211_CHAN_NO_VHT80PLUS;
+ else
+ channel->flags &= ~IEEE80211_CHAN_NO_VHT80PLUS;
+}
+
+static void reg_process_vht_flags(struct wiphy *wiphy)
+{
+ unsigned int i;
+ struct ieee80211_supported_band *sband;
+
+ if(!wiphy->bands[IEEE80211_BAND_5GHZ]) {
+ /* 5GHz band is not supported, which is
+ * mandatory for VHT. so simply return */
+ return;
+ }
+ sband = wiphy->bands[IEEE80211_BAND_5GHZ];
+
+ for (i = 0; i < sband->n_channels; i++)
+ reg_process_vht_flags_channel(wiphy, i);
+}
+
static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
{
if (!chan)
@@ -1230,6 +1305,7 @@ static void wiphy_update_regulatory(struct wiphy *wiphy,
reg_process_beacons(wiphy);
reg_process_ht_flags(wiphy);
+ reg_process_vht_flags(wiphy);
if (wiphy->reg_notifier)
wiphy->reg_notifier(wiphy, last_request);
}--
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