nl80211: S1G band and channel definitions

Gives drivers the definitions needed to advertise support
for S1G bands.
Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
Link: https://lore.kernel.org/r/20200602062247.23212-1-thomas@adapt-ip.com
Link: https://lore.kernel.org/r/20200731055636.795173-1-thomas@adapt-ip.comSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/ath/ath10k/mac.c

@@ -568,11 +568,7 @@ chan_to_phymode(const struct cfg80211_chan_def *chandef)
 		case NL80211_CHAN_WIDTH_40:
 			phymode = MODE_11NG_HT40;
 			break;
-		case NL80211_CHAN_WIDTH_5:
-		case NL80211_CHAN_WIDTH_10:
-		case NL80211_CHAN_WIDTH_80:
-		case NL80211_CHAN_WIDTH_80P80:
-		case NL80211_CHAN_WIDTH_160:
+		default:
 			phymode = MODE_UNKNOWN;
 			break;
 		}
@@ -597,8 +593,7 @@ chan_to_phymode(const struct cfg80211_chan_def *chandef)
 		case NL80211_CHAN_WIDTH_80P80:
 			phymode = MODE_11AC_VHT80_80;
 			break;
-		case NL80211_CHAN_WIDTH_5:
-		case NL80211_CHAN_WIDTH_10:
+		default:
 			phymode = MODE_UNKNOWN;
 			break;
 		}

include/net/cfg80211.h

@@ -417,6 +417,22 @@ struct ieee80211_edmg {
 	enum ieee80211_edmg_bw_config bw_config;
 };
 
+/**
+ * struct ieee80211_sta_s1g_cap - STA's S1G capabilities
+ *
+ * This structure describes most essential parameters needed
+ * to describe 802.11ah S1G capabilities for a STA.
+ *
+ * @s1g_supported: is STA an S1G STA
+ * @cap: S1G capabilities information
+ * @nss_mcs: Supported NSS MCS set
+ */
+struct ieee80211_sta_s1g_cap {
+	bool s1g;
+	u8 cap[10]; /* use S1G_CAPAB_ */
+	u8 nss_mcs[5];
+};
+
 /**
  * struct ieee80211_supported_band - frequency band definition
  *
@@ -448,6 +464,7 @@ struct ieee80211_supported_band {
 	int n_bitrates;
 	struct ieee80211_sta_ht_cap ht_cap;
 	struct ieee80211_sta_vht_cap vht_cap;
+	struct ieee80211_sta_s1g_cap s1g_cap;
 	struct ieee80211_edmg edmg_cap;
 	u16 n_iftype_data;
 	const struct ieee80211_sband_iftype_data *iftype_data;

include/uapi/linux/nl80211.h

@@ -4437,6 +4437,11 @@ enum nl80211_key_mode {
  *	attribute must be provided as well
  * @NL80211_CHAN_WIDTH_5: 5 MHz OFDM channel
  * @NL80211_CHAN_WIDTH_10: 10 MHz OFDM channel
+ * @NL80211_CHAN_WIDTH_1: 1 MHz OFDM channel
+ * @NL80211_CHAN_WIDTH_2: 2 MHz OFDM channel
+ * @NL80211_CHAN_WIDTH_4: 4 MHz OFDM channel
+ * @NL80211_CHAN_WIDTH_8: 8 MHz OFDM channel
+ * @NL80211_CHAN_WIDTH_16: 16 MHz OFDM channel
  */
 enum nl80211_chan_width {
 	NL80211_CHAN_WIDTH_20_NOHT,
@@ -4447,6 +4452,11 @@ enum nl80211_chan_width {
 	NL80211_CHAN_WIDTH_160,
 	NL80211_CHAN_WIDTH_5,
 	NL80211_CHAN_WIDTH_10,
+	NL80211_CHAN_WIDTH_1,
+	NL80211_CHAN_WIDTH_2,
+	NL80211_CHAN_WIDTH_4,
+	NL80211_CHAN_WIDTH_8,
+	NL80211_CHAN_WIDTH_16,
 };
 
 /**
@@ -4457,11 +4467,15 @@ enum nl80211_chan_width {
  * @NL80211_BSS_CHAN_WIDTH_20: control channel is 20 MHz wide or compatible
  * @NL80211_BSS_CHAN_WIDTH_10: control channel is 10 MHz wide
  * @NL80211_BSS_CHAN_WIDTH_5: control channel is 5 MHz wide
+ * @NL80211_BSS_CHAN_WIDTH_1: control channel is 1 MHz wide
+ * @NL80211_BSS_CHAN_WIDTH_2: control channel is 2 MHz wide
  */
 enum nl80211_bss_scan_width {
 	NL80211_BSS_CHAN_WIDTH_20,
 	NL80211_BSS_CHAN_WIDTH_10,
 	NL80211_BSS_CHAN_WIDTH_5,
+	NL80211_BSS_CHAN_WIDTH_1,
+	NL80211_BSS_CHAN_WIDTH_2,
 };
 
 /**
@@ -4740,6 +4754,7 @@ enum nl80211_txrate_gi {
  * @NL80211_BAND_5GHZ: around 5 GHz band (4.9 - 5.7 GHz)
  * @NL80211_BAND_60GHZ: around 60 GHz band (58.32 - 69.12 GHz)
  * @NL80211_BAND_6GHZ: around 6 GHz band (5.9 - 7.2 GHz)
+ * @NL80211_BAND_S1GHZ: around 900MHz, supported by S1G PHYs
  * @NUM_NL80211_BANDS: number of bands, avoid using this in userspace
  *	since newer kernel versions may support more bands
  */
@@ -4748,6 +4763,7 @@ enum nl80211_band {
 	NL80211_BAND_5GHZ,
 	NL80211_BAND_60GHZ,
 	NL80211_BAND_6GHZ,
+	NL80211_BAND_S1GHZ,
 
 	NUM_NL80211_BANDS,
 };

net/mac80211/chan.c

@@ -313,9 +313,14 @@ void ieee80211_recalc_chanctx_min_def(struct ieee80211_local *local,
 
 	lockdep_assert_held(&local->chanctx_mtx);
 
-	/* don't optimize 5MHz, 10MHz, and radar_enabled confs */
+	/* don't optimize non-20MHz based and radar_enabled confs */
 	if (ctx->conf.def.width == NL80211_CHAN_WIDTH_5 ||
 	    ctx->conf.def.width == NL80211_CHAN_WIDTH_10 ||
+	    ctx->conf.def.width == NL80211_CHAN_WIDTH_1 ||
+	    ctx->conf.def.width == NL80211_CHAN_WIDTH_2 ||
+	    ctx->conf.def.width == NL80211_CHAN_WIDTH_4 ||
+	    ctx->conf.def.width == NL80211_CHAN_WIDTH_8 ||
+	    ctx->conf.def.width == NL80211_CHAN_WIDTH_16 ||
 	    ctx->conf.radar_enabled) {
 		ctx->conf.min_def = ctx->conf.def;
 		return;

net/mac80211/scan.c

@@ -913,6 +913,7 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 	case NL80211_BSS_CHAN_WIDTH_10:
 		local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
 		break;
+	default:
 	case NL80211_BSS_CHAN_WIDTH_20:
 		/* If scanning on oper channel, use whatever channel-type
 		 * is currently in use.

net/mac80211/tx.c

@@ -166,6 +166,7 @@ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
 			if (r->flags & IEEE80211_RATE_MANDATORY_A)
 				mrate = r->bitrate;
 			break;
+		case NL80211_BAND_S1GHZ:
 		case NL80211_BAND_60GHZ:
 			/* TODO, for now fall through */
 		case NUM_NL80211_BANDS:

net/mac80211/util.c

@@ -3730,6 +3730,11 @@ u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
 		c->width = NL80211_CHAN_WIDTH_20_NOHT;
 		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
 		break;
+	case NL80211_CHAN_WIDTH_1:
+	case NL80211_CHAN_WIDTH_2:
+	case NL80211_CHAN_WIDTH_4:
+	case NL80211_CHAN_WIDTH_8:
+	case NL80211_CHAN_WIDTH_16:
 	case NL80211_CHAN_WIDTH_5:
 	case NL80211_CHAN_WIDTH_10:
 		WARN_ON_ONCE(1);

net/wireless/chan.c

@@ -153,6 +153,11 @@ bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
 	control_freq = chandef->chan->center_freq;
 
 	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_1:
+	case NL80211_CHAN_WIDTH_2:
+	case NL80211_CHAN_WIDTH_4:
+	case NL80211_CHAN_WIDTH_8:
+	case NL80211_CHAN_WIDTH_16:
 	case NL80211_CHAN_WIDTH_5:
 	case NL80211_CHAN_WIDTH_10:
 	case NL80211_CHAN_WIDTH_20:
@@ -263,6 +268,21 @@ static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
 	int width;
 
 	switch (c->width) {
+	case NL80211_CHAN_WIDTH_1:
+		width = 1;
+		break;
+	case NL80211_CHAN_WIDTH_2:
+		width = 2;
+		break;
+	case NL80211_CHAN_WIDTH_4:
+		width = 4;
+		break;
+	case NL80211_CHAN_WIDTH_8:
+		width = 8;
+		break;
+	case NL80211_CHAN_WIDTH_16:
+		width = 16;
+		break;
 	case NL80211_CHAN_WIDTH_5:
 		width = 5;
 		break;
@@ -911,6 +931,21 @@ bool cfg80211_chandef_usable(struct wiphy *wiphy,
 	control_freq = chandef->chan->center_freq;
 
 	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_1:
+		width = 1;
+		break;
+	case NL80211_CHAN_WIDTH_2:
+		width = 2;
+		break;
+	case NL80211_CHAN_WIDTH_4:
+		width = 4;
+		break;
+	case NL80211_CHAN_WIDTH_8:
+		width = 8;
+		break;
+	case NL80211_CHAN_WIDTH_16:
+		width = 16;
+		break;
 	case NL80211_CHAN_WIDTH_5:
 		width = 5;
 		break;

net/wireless/core.c

@@ -803,10 +803,11 @@ int wiphy_register(struct wiphy *wiphy)
 		if (WARN_ON(!sband->n_channels))
 			return -EINVAL;
 		/*
-		 * on 60GHz band, there are no legacy rates, so
+		 * on 60GHz or sub-1Ghz band, there are no legacy rates, so
 		 * n_bitrates is 0
 		 */
-		if (WARN_ON(band != NL80211_BAND_60GHZ &&
+		if (WARN_ON((band != NL80211_BAND_60GHZ &&
+			     band != NL80211_BAND_S1GHZ) &&
 			    !sband->n_bitrates))
 			return -EINVAL;
 

net/wireless/util.c

@@ -102,6 +102,8 @@ u32 ieee80211_channel_to_freq_khz(int chan, enum nl80211_band band)
 		if (chan < 7)
 			return MHZ_TO_KHZ(56160 + chan * 2160);
 		break;
+	case NL80211_BAND_S1GHZ:
+		return 902000 + chan * 500;
 	default:
 		;
 	}
@@ -210,6 +212,12 @@ static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
 		WARN_ON(!sband->ht_cap.ht_supported);
 		WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 		break;
+	case NL80211_BAND_S1GHZ:
+		/* Figure 9-589bd: 3 means unsupported, so != 3 means at least
+		 * mandatory is ok.
+		 */
+		WARN_ON((sband->s1g_cap.nss_mcs[0] & 0x3) == 0x3);
+		break;
 	case NUM_NL80211_BANDS:
 	default:
 		WARN_ON(1);