wifi: mac80211: Align with Draft P802.11be_D1.5

Align the mac80211 implementation with P802.11be_D1.5.
Signed-off-by: NIlan Peer <ilan.peer@intel.com>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

include/linux/ieee80211.h

@@ -2046,25 +2046,38 @@ struct ieee80211_eht_cap_elem {
 	u8 optional[];
 } __packed;
 
+#define IEEE80211_EHT_OPER_INFO_PRESENT	                        0x1
+#define IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT	0x2
+
 /**
  * struct ieee80211_eht_operation - eht operation element
  *
  * This structure is the "EHT Operation Element" fields as
- * described in P802.11be_D1.4 section 9.4.2.311
+ * described in P802.11be_D1.5 section 9.4.2.311
  *
- * FIXME: The spec is unclear how big the fields are, and doesn't
- *	  indicate the "Disabled Subchannel Bitmap Present" in the
- *	  structure (Figure 9-1002a) at all ...
+ * @params: EHT operation element parameters. See &IEEE80211_EHT_OPER_*
+ * @optional: optional parts
  */
 struct ieee80211_eht_operation {
-	u8 chan_width;
-	u8 ccfs;
-	u8 present_bm;
-
-	u8 disable_subchannel_bitmap[];
+	u8 params;
+	u8 optional[];
 } __packed;
 
-#define IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT	0x1
+/**
+ * struct ieee80211_eht_operation_info - eht operation information
+ *
+ * @control: EHT operation information control.
+ * @ccfs0: defines a channel center frequency for a 20, 40, 80, 160, or 320 MHz
+ *     EHT BSS.
+ * @ccfs1: defines a channel center frequency for a 160 or 320 MHz EHT BSS.
+ * @optional: optional parts
+ */
+struct ieee80211_eht_operation_info {
+	u8 control;
+	u8 ccfs0;
+	u8 ccfs1;
+	u8 optional[];
+} __packed;
 
 /* 802.11ac VHT Capabilities */
 #define IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895			0x00000000
@@ -2773,10 +2786,12 @@ ieee80211_he_spr_size(const u8 *he_spr_ie)
 #define IEEE80211_EHT_MAC_CAP0_TRIG_TXOP_SHARING_MODE2		0x08
 #define IEEE80211_EHT_MAC_CAP0_RESTRICTED_TWT			0x10
 #define IEEE80211_EHT_MAC_CAP0_SCS_TRAFFIC_DESC			0x20
-#define IEEE80211_EHT_MAC_CAP0_MAX_AMPDU_LEN_MASK		0xc0
-#define		IEEE80211_EHT_MAC_CAP0_MAX_AMPDU_LEN_3895	0
-#define		IEEE80211_EHT_MAC_CAP0_MAX_AMPDU_LEN_7991	1
-#define		IEEE80211_EHT_MAC_CAP0_MAX_AMPDU_LEN_11454	2
+#define IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK		0xc0
+#define	IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895	        0
+#define	IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991	        1
+#define	IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454	        2
+
+#define IEEE80211_EHT_MAC_CAP1_MAX_AMPDU_LEN_MASK		0x01
 
 /* EHT PHY capabilities as defined in P802.11be_D1.4 section 9.4.2.313.3 */
 #define IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ			0x02
@@ -2949,8 +2964,13 @@ ieee80211_eht_oper_size_ok(const u8 *data, u8 len)
 	if (len < needed)
 		return false;
 
-	if (elem->present_bm & IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)
-		needed += 2;
+	if (elem->params & IEEE80211_EHT_OPER_INFO_PRESENT) {
+		needed += 3;
+
+		if (elem->params &
+		    IEEE80211_EHT_OPER_DISABLED_SUBCHANNEL_BITMAP_PRESENT)
+			needed += 2;
+	}
 
 	return len >= needed;
 }

net/mac80211/ieee80211_i.h

@@ -2326,6 +2326,10 @@ bool ieee80211_chandef_vht_oper(struct ieee80211_hw *hw, u32 vht_cap_info,
 				const struct ieee80211_vht_operation *oper,
 				const struct ieee80211_ht_operation *htop,
 				struct cfg80211_chan_def *chandef);
+void ieee80211_chandef_eht_oper(struct ieee80211_sub_if_data *sdata,
+				const struct ieee80211_eht_operation *eht_oper,
+				bool support_160, bool support_320,
+				struct cfg80211_chan_def *chandef);
 bool ieee80211_chandef_he_6ghz_oper(struct ieee80211_sub_if_data *sdata,
 				    const struct ieee80211_he_operation *he_oper,
 				    const struct ieee80211_eht_operation *eht_oper,

net/mac80211/mlme.c

@@ -303,6 +303,38 @@ ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
 
 	*chandef = vht_chandef;
 
+	/*
+	 * handle the case that the EHT operation indicates that it holds EHT
+	 * operation information (in case that the channel width differs from
+	 * the channel width reported in HT/VHT/HE).
+	 */
+	if (eht_oper && (eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT)) {
+		struct cfg80211_chan_def eht_chandef = *chandef;
+
+		ieee80211_chandef_eht_oper(sdata, eht_oper,
+					   eht_chandef.width ==
+					   NL80211_CHAN_WIDTH_160,
+					   false, &eht_chandef);
+
+		if (!cfg80211_chandef_valid(&eht_chandef)) {
+			if (!(ifmgd->flags & IEEE80211_STA_DISABLE_EHT))
+				sdata_info(sdata,
+					   "AP EHT information is invalid, disabling EHT\n");
+			ret = IEEE80211_STA_DISABLE_EHT;
+			goto out;
+		}
+
+		if (!cfg80211_chandef_compatible(chandef, &eht_chandef)) {
+			if (!(ifmgd->flags & IEEE80211_STA_DISABLE_EHT))
+				sdata_info(sdata,
+					   "AP EHT information is incompatible, disabling EHT\n");
+			ret = IEEE80211_STA_DISABLE_EHT;
+			goto out;
+		}
+
+		*chandef = eht_chandef;
+	}
+
 	ret = 0;
 
 out:

net/mac80211/util.c

@@ -3459,6 +3459,58 @@ bool ieee80211_chandef_vht_oper(struct ieee80211_hw *hw, u32 vht_cap_info,
 	return true;
 }
 
+void ieee80211_chandef_eht_oper(struct ieee80211_sub_if_data *sdata,
+				const struct ieee80211_eht_operation *eht_oper,
+				bool support_160, bool support_320,
+				struct cfg80211_chan_def *chandef)
+{
+	struct ieee80211_eht_operation_info *info = (void *)eht_oper->optional;
+
+	chandef->center_freq1 =
+		ieee80211_channel_to_frequency(info->ccfs0,
+					       chandef->chan->band);
+
+	switch (u8_get_bits(info->control,
+			    IEEE80211_EHT_OPER_CHAN_WIDTH)) {
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_20MHZ:
+		chandef->width = NL80211_CHAN_WIDTH_20;
+		break;
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_40MHZ:
+		chandef->width = NL80211_CHAN_WIDTH_40;
+		break;
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_80MHZ:
+		chandef->width = NL80211_CHAN_WIDTH_80;
+		break;
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_160MHZ:
+		if (support_160) {
+			chandef->width = NL80211_CHAN_WIDTH_160;
+			chandef->center_freq1 =
+				ieee80211_channel_to_frequency(info->ccfs1,
+							       chandef->chan->band);
+		} else {
+			chandef->width = NL80211_CHAN_WIDTH_80;
+		}
+		break;
+	case IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ:
+		if (support_320) {
+			chandef->width = NL80211_CHAN_WIDTH_320;
+			chandef->center_freq1 =
+				ieee80211_channel_to_frequency(info->ccfs1,
+							       chandef->chan->band);
+		} else if (support_160) {
+			chandef->width = NL80211_CHAN_WIDTH_160;
+		} else {
+			chandef->width = NL80211_CHAN_WIDTH_80;
+
+			if (chandef->center_freq1 > chandef->chan->center_freq)
+				chandef->center_freq1 -= 40;
+			else
+				chandef->center_freq1 += 40;
+		}
+		break;
+	}
+}
+
 bool ieee80211_chandef_he_6ghz_oper(struct ieee80211_sub_if_data *sdata,
 				    const struct ieee80211_he_operation *he_oper,
 				    const struct ieee80211_eht_operation *eht_oper,
@@ -3539,7 +3591,8 @@ bool ieee80211_chandef_he_6ghz_oper(struct ieee80211_sub_if_data *sdata,
 		break;
 	}
 
-	if (!eht_oper) {
+	if (!eht_oper ||
+	    !(eht_oper->params & IEEE80211_EHT_OPER_INFO_PRESENT)) {
 		switch (u8_get_bits(he_6ghz_oper->control,
 				    IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH)) {
 		case IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ:
@@ -3583,36 +3636,8 @@ bool ieee80211_chandef_he_6ghz_oper(struct ieee80211_sub_if_data *sdata,
 		support_320 =
 			eht_phy_cap & IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ;
 
-		switch (u8_get_bits(eht_oper->chan_width,
-				    IEEE80211_EHT_OPER_CHAN_WIDTH)) {
-		case IEEE80211_EHT_OPER_CHAN_WIDTH_20MHZ:
-			he_chandef.width = NL80211_CHAN_WIDTH_20;
-			break;
-		case IEEE80211_EHT_OPER_CHAN_WIDTH_40MHZ:
-			he_chandef.width = NL80211_CHAN_WIDTH_40;
-			break;
-		case IEEE80211_EHT_OPER_CHAN_WIDTH_80MHZ:
-			he_chandef.width = NL80211_CHAN_WIDTH_80;
-			break;
-		case IEEE80211_EHT_OPER_CHAN_WIDTH_160MHZ:
-			if (support_160)
-				he_chandef.width = NL80211_CHAN_WIDTH_160;
-			else
-				he_chandef.width = NL80211_CHAN_WIDTH_80;
-			break;
-		case IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ:
-			if (support_320)
-				he_chandef.width = NL80211_CHAN_WIDTH_320;
-			else if (support_160)
-				he_chandef.width = NL80211_CHAN_WIDTH_160;
-			else
-				he_chandef.width = NL80211_CHAN_WIDTH_80;
-			break;
-		}
-
-		he_chandef.center_freq1 =
-			ieee80211_channel_to_frequency(eht_oper->ccfs,
-						       NL80211_BAND_6GHZ);
+		ieee80211_chandef_eht_oper(sdata, eht_oper, support_160,
+					   support_320, &he_chandef);
 	}
 
 	if (!cfg80211_chandef_valid(&he_chandef)) {