VHT (11ac) regulatory new design. VHT channel center freq, bandwidth and
primary channel are used to decide if that channel config is permitted
in current regulatory domain.
Signed-off-by: Mahesh Palivela <maheshp@xxxxxxxxxxx>
---
Implementation of review comments by Johannes.
include/net/cfg80211.h | 37 +++++++++++++++++
net/wireless/reg.c | 105 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 142 insertions(+), 0 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 4c518f1..edc743f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -83,6 +83,25 @@ enum ieee80211_band {
};
/**
+ * enum ieee80211_chan_width - channel bandwidths
+ *
+ * @IEEE80211_CHAN_WIDTH_20MHZ_NOHT: 20 MHz chan bandwidth No HT
+ * @IEEE80211_CHAN_WIDTH_20MHZ: 20 MHz chan bandwidth
+ * @IEEE80211_CHAN_WIDTH_40MHZ: 40 MHz chan bandwidth
+ * @IEEE80211_CHAN_WIDTH_80MHZ: 80 MHz chan bandwidth
+ * @IEEE80211_CHAN_WIDTH_160MHZ: 160 MHz chan bandwidth
+ * @IEEE80211_CHAN_WIDTH_80P80MHZ: 80+80 MHz chan bandwidth
+ */
+enum ieee80211_chan_width {
+ IEEE80211_CHAN_WIDTH_20MHZ_NOHT,
+ IEEE80211_CHAN_WIDTH_20MHZ,
+ IEEE80211_CHAN_WIDTH_40MHZ,
+ IEEE80211_CHAN_WIDTH_80MHZ,
+ IEEE80211_CHAN_WIDTH_160MHZ,
+ IEEE80211_CHAN_WIDTH_80P80MHZ
+};
+
+/**
* enum ieee80211_channel_flags - channel flags
*
* Channel flags set by the regulatory control code.
@@ -144,6 +163,24 @@ struct ieee80211_channel {
};
/**
+ * struct ieee80211_channel_config - channel config definition
+ *
+ * This structure describes channel configuration
+ *
+ * @chan_width1: channel bandwidth
+ * @center_freq1: center frequency of 1 st frequency segment
+ * @center_freq2: center frequency of 2 nd frequency segment
+ * Used only for 80+80 MHz combination
+ * @prim_chan_freq: primary channel frequency
+ */
+struct ieee80211_channel_config {
+ enum ieee80211_chan_width chan_width;
+ u16 center_freq1;
+ u16 center_freq2;
+ u16 prim_chan_freq;
+};
+
+/**
* enum ieee80211_rate_flags - rate flags
*
* Hardware/specification flags for rates. These are structured
diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 2303ee7..f491f7b 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -1124,6 +1124,111 @@ static void reg_process_beacons(struct wiphy *wiphy)
wiphy_update_beacon_reg(wiphy);
}
+static bool reg_sec_chans_permitted(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bw_khz)
+{
+ struct ieee80211_channel *chan;
+ u32 left_end_freq, right_end_freq;
+
+ if (center_freq == 0 || bw_khz == 0)
+ return false;
+
+ /* find left and right arms of center freq */
+ left_end_freq = center_freq - (bw_khz/2);
+ right_end_freq = center_freq + (bw_khz/2);
+
+ /* left_end_freq and right_end_freq are edge of left and right
+ * channels. Get center freq of left and right channels
+ * by adding 10MHz to left_end_freq and subtracting 10 MHZ from
+ * right_end_freq.
+ */
+ left_end_freq += MHZ_TO_KHZ(10);
+ right_end_freq -= MHZ_TO_KHZ(10);
+
+ /* find out all possible secondary channels */
+ while (left_end_freq < right_end_freq) {
+ chan = ieee80211_get_channel(wiphy, left_end_freq);
+ if (chan == NULL ||
+ chan->flags & IEEE80211_CHAN_DISABLED) {
+ return false;
+ }
+ left_end_freq -= MHZ_TO_KHZ(20);
+ }
+
+ return true;
+}
+
+bool reg_chan_use_permitted(struct wiphy *wiphy,
+ struct ieee80211_channel_config *chan_config,
+ const struct ieee80211_regdomain *regd)
+{
+ int r;
+ u32 desired_bw_khz = MHZ_TO_KHZ(20);
+ const struct ieee80211_reg_rule *reg_rule;
+ const struct ieee80211_freq_range *freq_range;
+ bool ret;
+
+ assert_reg_lock();
+
+ // get chan BW from config
+ switch (chan_config->chan_width) {
+ case IEEE80211_CHAN_WIDTH_20MHZ_NOHT:
+ case IEEE80211_CHAN_WIDTH_20MHZ:
+ desired_bw_khz = MHZ_TO_KHZ(20);
+ break;
+
+ case IEEE80211_CHAN_WIDTH_40MHZ:
+ desired_bw_khz = MHZ_TO_KHZ(40);
+ break;
+
+ case IEEE80211_CHAN_WIDTH_80MHZ:
+ case IEEE80211_CHAN_WIDTH_80P80MHZ:
+ desired_bw_khz = MHZ_TO_KHZ(80);
+ break;
+
+ case IEEE80211_CHAN_WIDTH_160MHZ:
+ desired_bw_khz = MHZ_TO_KHZ(160);
+ break;
+ default:
+ REG_DBG_PRINT("Invalid channel width %d\n",
+ chan_config->chan_width);
+ return false;
+ }
+
+ r = freq_reg_info_regd(wiphy,
+ chan_config->prim_chan_freq,
+ desired_bw_khz,
+ ®_rule,
+ regd);
+
+ if (r) {
+ REG_DBG_PRINT("Couldn't find reg rule for freq %d KHz"
+ "and %d MHz wide channel\n",
+ chan_config->prim_chan_freq,
+ KHZ_TO_MHZ(desired_bw_khz));
+ return false;
+ }
+
+ freq_range = ®_rule->freq_range;
+
+ if (freq_range->max_bandwidth_khz < desired_bw_khz)
+ return false;
+
+ ret = reg_sec_chans_permitted(wiphy,
+ chan_config->center_freq1,
+ desired_bw_khz);
+ if (ret == false)
+ return ret;
+
+ if (chan_config->chan_width == IEEE80211_CHAN_WIDTH_80P80MHZ) {
+ ret = reg_sec_chans_permitted(wiphy,
+ chan_config->center_freq2,
+ desired_bw_khz);
+ }
+ return ret;
+}
+
static bool is_ht40_not_allowed(struct ieee80211_channel *chan)
{
if (!chan)
--
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