cfg80211: change internal management frame registration API

Almost all drivers below cfg80211 get the API wrong (except for
cfg80211) and are unable to cope with multiple registrations for
the same frame type, which is valid due to the match filter.
This seems to indicate the API is wrong, and we should maintain
the full information in cfg80211 instead of the drivers.

Change the API to no longer inform the driver about individual
registrations and unregistrations, but rather every time about
the entire state of the entire wiphy and single wdev, whenever
it may have changed. This also simplifies the code in cfg80211
as it no longer has to track exactly what was unregistered and
can free things immediately.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Link: https://lore.kernel.org/r/20200417124300.f47f3828afc8.I7f81ef59c2c5a340d7075fb3c6d0e08e8aeffe07@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -389,55 +389,57 @@ static int qtnf_set_wiphy_params(struct wiphy *wiphy, u32 changed)
 }
 
 static void
-qtnf_mgmt_frame_register(struct wiphy *wiphy, struct wireless_dev *wdev,
-			 u16 frame_type, bool reg)
+qtnf_update_mgmt_frame_registrations(struct wiphy *wiphy,
+				     struct wireless_dev *wdev,
+				     struct mgmt_frame_regs *upd)
 {
 	struct qtnf_vif *vif = qtnf_netdev_get_priv(wdev->netdev);
-	u16 mgmt_type;
-	u16 new_mask;
-	u16 qlink_frame_type = 0;
+	u16 new_mask = upd->interface_stypes;
+	u16 old_mask = vif->mgmt_frames_bitmask;
+	static const struct {
+		u16 mask, qlink_type;
+	} updates[] = {
+		{
+			.mask = BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
+				BIT(IEEE80211_STYPE_ASSOC_REQ >> 4),
+			.qlink_type = QLINK_MGMT_FRAME_ASSOC_REQ,
+		},
+		{
+			.mask = BIT(IEEE80211_STYPE_AUTH >> 4),
+			.qlink_type = QLINK_MGMT_FRAME_AUTH,
+		},
+		{
+			.mask = BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
+			.qlink_type = QLINK_MGMT_FRAME_PROBE_REQ,
+		},
+		{
+			.mask = BIT(IEEE80211_STYPE_ACTION >> 4),
+			.qlink_type = QLINK_MGMT_FRAME_ACTION,
+		},
+	};
+	unsigned int i;
 
-	mgmt_type = (frame_type & IEEE80211_FCTL_STYPE) >> 4;
-
-	if (reg)
-		new_mask = vif->mgmt_frames_bitmask | BIT(mgmt_type);
-	else
-		new_mask = vif->mgmt_frames_bitmask & ~BIT(mgmt_type);
-
-	if (new_mask == vif->mgmt_frames_bitmask)
+	if (new_mask == old_mask)
 		return;
 
-	switch (frame_type & IEEE80211_FCTL_STYPE) {
-	case IEEE80211_STYPE_REASSOC_REQ:
-	case IEEE80211_STYPE_ASSOC_REQ:
-		qlink_frame_type = QLINK_MGMT_FRAME_ASSOC_REQ;
-		break;
-	case IEEE80211_STYPE_AUTH:
-		qlink_frame_type = QLINK_MGMT_FRAME_AUTH;
-		break;
-	case IEEE80211_STYPE_PROBE_REQ:
-		qlink_frame_type = QLINK_MGMT_FRAME_PROBE_REQ;
-		break;
-	case IEEE80211_STYPE_ACTION:
-		qlink_frame_type = QLINK_MGMT_FRAME_ACTION;
-		break;
-	default:
-		pr_warn("VIF%u.%u: unsupported frame type: %X\n",
-			vif->mac->macid, vif->vifid,
-			(frame_type & IEEE80211_FCTL_STYPE) >> 4);
-		return;
-	}
+	for (i = 0; i < ARRAY_SIZE(updates); i++) {
+		u16 mask = updates[i].mask;
+		u16 qlink_frame_type = updates[i].qlink_type;
+		bool reg;
 
-	if (qtnf_cmd_send_register_mgmt(vif, qlink_frame_type, reg)) {
-		pr_warn("VIF%u.%u: failed to %sregister mgmt frame type 0x%x\n",
-			vif->mac->macid, vif->vifid, reg ? "" : "un",
-			frame_type);
-		return;
+		/* the ! are here due to the assoc/reassoc merge */
+		if (!(new_mask & mask) == !(old_mask & mask))
+			continue;
+
+		reg = new_mask & mask;
+
+		if (qtnf_cmd_send_register_mgmt(vif, qlink_frame_type, reg))
+			pr_warn("VIF%u.%u: failed to %sregister qlink frame type 0x%x\n",
+				vif->mac->macid, vif->vifid, reg ? "" : "un",
+				qlink_frame_type);
 	}
 
 	vif->mgmt_frames_bitmask = new_mask;
-	pr_debug("VIF%u.%u: %sregistered mgmt frame type 0x%x\n",
-		 vif->mac->macid, vif->vifid, reg ? "" : "un", frame_type);
 }
 
 static int
@@ -1017,7 +1019,8 @@ static struct cfg80211_ops qtn_cfg80211_ops = {
 	.change_beacon		= qtnf_change_beacon,
 	.stop_ap		= qtnf_stop_ap,
 	.set_wiphy_params	= qtnf_set_wiphy_params,
-	.mgmt_frame_register	= qtnf_mgmt_frame_register,
+	.update_mgmt_frame_registrations =
+		qtnf_update_mgmt_frame_registrations,
 	.mgmt_tx		= qtnf_mgmt_tx,
 	.change_station		= qtnf_change_station,
 	.del_station		= qtnf_del_station,