nl80211: modify TID-config API

Make some changes to the TID-config API:
 * use u16 in nl80211 (only, and restrict to using 8 bits for now),
   to avoid issues in the future if we ever want to use higher TIDs.
 * reject empty TIDs mask (via netlink policy)
 * change feature advertising to not use extended feature flags but
   have own mechanism for this, which simplifies the code
 * fix all variable names from 'tid' to 'tids' since it's a mask
 * change to cfg80211_ name prefixes, not ieee80211_
 * fix some minor docs/spelling things.

Change-Id: Ia234d464b3f914cdeab82f540e018855be580dce
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/cfg80211.h

@@ -626,36 +626,32 @@ struct cfg80211_chan_def {
 	struct ieee80211_edmg edmg;
 };
 
-enum ieee80211_tid_conf_mask {
-	IEEE80211_TID_CONF_NOACK	= BIT(NL80211_TID_CONFIG_ATTR_NOACK),
-};
-
 /**
- * struct ieee80211_tid_cfg - TID specific configuration
+ * struct cfg80211_tid_cfg - TID specific configuration
  * @config_override: Flag to notify driver to reset TID configuration
  *	of the peer.
- * @tid: TID number
- * @tid_conf_mask: bitmap indicating which parameter changed
- *	see &enum ieee80211_tid_conf_mask
+ * @tids: bitmap of TIDs to modify
+ * @mask: bitmap of attributes indicating which parameter changed,
+ *	similar to &nl80211_tid_config_supp.
  * @noack: noack configuration value for the TID
  */
-struct ieee80211_tid_cfg {
+struct cfg80211_tid_cfg {
 	bool config_override;
-	u8 tid;
-	u32 tid_conf_mask;
+	u8 tids;
+	u32 mask;
 	enum nl80211_tid_config noack;
 };
 
 /**
- * struct ieee80211_tid_config - TID configuration
+ * struct cfg80211_tid_config - TID configuration
  * @peer: Station's MAC address
  * @n_tid_conf: Number of TID specific configurations to be applied
  * @tid_conf: Configuration change info
  */
-struct ieee80211_tid_config {
+struct cfg80211_tid_config {
 	const u8 *peer;
 	u32 n_tid_conf;
-	struct ieee80211_tid_cfg tid_conf[];
+	struct cfg80211_tid_cfg tid_conf[];
 };
 
 /**
@@ -3705,8 +3701,8 @@ struct cfg80211_update_owe_info {
  *	and overrule HWMP path selection algorithm.
  * @set_tid_config: TID specific configuration, this can be peer or BSS specific
  *	This callback may sleep.
- * @reset_tid_config: Reset TID specific configuration for the peer.
- *	This callback may sleep.
+ * @reset_tid_config: Reset TID specific configuration for the peer, for the
+ *	given TIDs. This callback may sleep.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -4031,9 +4027,9 @@ struct cfg80211_ops {
 	int	(*probe_mesh_link)(struct wiphy *wiphy, struct net_device *dev,
 				   const u8 *buf, size_t len);
 	int     (*set_tid_config)(struct wiphy *wiphy, struct net_device *dev,
-				  struct ieee80211_tid_config *tid_conf);
+				  struct cfg80211_tid_config *tid_conf);
 	int	(*reset_tid_config)(struct wiphy *wiphy, struct net_device *dev,
-				    const u8 *peer, u8 tid);
+				    const u8 *peer, u8 tids);
 };
 
 /*
@@ -4641,6 +4637,13 @@ struct wiphy_iftype_akm_suites {
  *	@support_mbssid must be set for this to have any effect.
  *
  * @pmsr_capa: peer measurement capabilities
+ *
+ * @tid_config_support: describes the per-TID config support that the
+ *	device has
+ * @tid_config_support.vif: bitmap of attributes (configurations)
+ *	supported by the driver for each vif
+ * @tid_config_support.peer: bitmap of attributes (configurations)
+ *	supported by the driver for each peer
  */
 struct wiphy {
 	/* assign these fields before you register the wiphy */
@@ -4772,6 +4775,10 @@ struct wiphy {
 
 	const struct cfg80211_pmsr_capabilities *pmsr_capa;
 
+	struct {
+		u64 peer, vif;
+	} tid_config_support;
+
 	char priv[0] __aligned(NETDEV_ALIGN);
 };
 

include/uapi/linux/nl80211.h

@@ -267,20 +267,22 @@
 /**
  * DOC: TID configuration
  *
- * TID configuration support can be advertised by drivers by setting
- * @NL80211_EXT_FEATURE_PER_TID_* and/or @NL80211_EXT_FEATURE_PER_STA_* config
- * mentioned in &enum nl80211_tid_config_attr.
- * Needed configuration parameters are mentioned in
- * &enum nl80211_tid_config_attr and it will be passed using
- * %NL80211_CMD_SET_TID_CONFIG through %NL80211_ATTR_TID_CONFIG.
- * If the configuration needs to be applied for specific peer then MAC address
- * of the peer needs to be passed in %NL80211_ATT_MAC, otherwise the
+ * TID config support can be checked in the %NL80211_ATTR_TID_CONFIG
+ * attribute given in wiphy capabilities.
+ *
+ * The necessary configuration parameters are mentioned in
+ * &enum nl80211_tid_config_attr and it will be passed to the
+ * %NL80211_CMD_SET_TID_CONFIG command in %NL80211_ATTR_TID_CONFIG.
+ *
+ * If the configuration needs to be applied for specific peer then the MAC
+ * address of the peer needs to be passed in %NL80211_ATTR_MAC, otherwise the
  * configuration will be applied for all the connected peers in the vif except
- * the peer which has peer specific configuration for the TID.
- * And the peer specific configuration will be overridden if
- * %NL80211_TID_CONFIG_ATTR_OVERRIDE flag is set.
- * All this configurations are valid only for STA's current connection
- * i.e. the configurations will be reset to default when the STA connects back
+ * any peers that have peer specific configuration for the TID by default; if
+ * the %NL80211_TID_CONFIG_ATTR_OVERRIDE flag is set, peer specific values
+ * will be overwritten.
+ *
+ * All this configuration is valid only for STA's current connection
+ * i.e. the configuration will be reset to default when the STA connects back
  * after disconnection/roaming, and this configuration will be cleared when
  * the interface goes down.
  */
@@ -2436,7 +2438,9 @@ enum nl80211_commands {
  *	advertised for a specific interface type.
  *
  * @NL80211_ATTR_TID_CONFIG: TID specific configuration in a
- *	nested attribute with &enum nl80211_tid_config_attr sub-attributes.
+ *	nested attribute with &enum nl80211_tid_config_attr sub-attributes;
+ *	on output (in wiphy attributes) it contains only the feature sub-
+ *	attributes.
  *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
@@ -4764,20 +4768,29 @@ enum nl80211_tid_config {
 };
 
 /* enum nl80211_tid_config_attr - TID specific configuration.
+ * @NL80211_TID_CONFIG_ATTR_PAD: pad attribute for 64-bit values
+ * @NL80211_TID_CONFIG_ATTR_VIF_SUPP: a bitmap (u64) of attributes supported
+ *	for per-vif configuration; doesn't list the ones that are generic
+ *	(%NL80211_TID_CONFIG_ATTR_TIDS, %NL80211_TID_CONFIG_ATTR_OVERRIDE).
+ * @NL80211_TID_CONFIG_ATTR_PEER_SUPP: same as the previous per-vif one, but
+ *	per peer instead.
  * @NL80211_TID_CONFIG_ATTR_OVERRIDE: flag attribue, if no peer
  *	is selected, if set indicates that the new configuration overrides
  *	all previous peer configurations, otherwise previous peer specific
  *	configurations should be left untouched. If peer is selected then
  *	it will reset particular TID configuration of that peer and it will
  *	not accept other TID config attributes along with peer.
- * @NL80211_TID_CONFIG_ATTR_TIDS: a bitmask value of TIDs(bit 0 to 7)
- *	Its type is u8.
+ * @NL80211_TID_CONFIG_ATTR_TIDS: a bitmask value of TIDs (bit 0 to 7)
+ *	Its type is u16.
  * @NL80211_TID_CONFIG_ATTR_NOACK: Configure ack policy for the TID.
  *	specified in %NL80211_TID_CONFIG_ATTR_TID. see %enum nl80211_tid_config.
  *	Its type is u8.
  */
 enum nl80211_tid_config_attr {
 	__NL80211_TID_CONFIG_ATTR_INVALID,
+	NL80211_TID_CONFIG_ATTR_PAD,
+	NL80211_TID_CONFIG_ATTR_VIF_SUPP,
+	NL80211_TID_CONFIG_ATTR_PEER_SUPP,
 	NL80211_TID_CONFIG_ATTR_OVERRIDE,
 	NL80211_TID_CONFIG_ATTR_TIDS,
 	NL80211_TID_CONFIG_ATTR_NOACK,
@@ -5605,10 +5618,6 @@ enum nl80211_feature_flags {
  * @NL80211_EXT_FEATURE_AQL: The driver supports the Airtime Queue Limit (AQL)
  *	feature, which prevents bufferbloat by using the expected transmission
  *	time to limit the amount of data buffered in the hardware.
- * @NL80211_EXT_FEATURE_PER_TID_NOACK_CONFIG: Driver supports per TID NoAck
- *	policy functionality.
- * @NL80211_EXT_FEATURE_PER_STA_NOACK_CONFIG: Driver supports STA specific NoAck
- *	policy functionality.
  *
  * @NL80211_EXT_FEATURE_BEACON_PROTECTION: The driver supports Beacon protection
  *	and can receive key configuration for BIGTK using key indexes 6 and 7.
@@ -5661,8 +5670,6 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_VLAN_OFFLOAD,
 	NL80211_EXT_FEATURE_AQL,
 	NL80211_EXT_FEATURE_BEACON_PROTECTION,
-	NL80211_EXT_FEATURE_PER_TID_NOACK_CONFIG,
-	NL80211_EXT_FEATURE_PER_STA_NOACK_CONFIG,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,

net/wireless/nl80211.c

@@ -330,8 +330,10 @@ he_bss_color_policy[NL80211_HE_BSS_COLOR_ATTR_MAX + 1] = {
 
 static const struct nla_policy
 nl80211_tid_config_attr_policy[NL80211_TID_CONFIG_ATTR_MAX + 1] = {
+	[NL80211_TID_CONFIG_ATTR_VIF_SUPP] = { .type = NLA_U64 },
+	[NL80211_TID_CONFIG_ATTR_PEER_SUPP] = { .type = NLA_U64 },
 	[NL80211_TID_CONFIG_ATTR_OVERRIDE] = { .type = NLA_FLAG },
-	[NL80211_TID_CONFIG_ATTR_TIDS] = { .type = NLA_U8 },
+	[NL80211_TID_CONFIG_ATTR_TIDS] = NLA_POLICY_RANGE(NLA_U16, 1, 0xff),
 	[NL80211_TID_CONFIG_ATTR_NOACK] =
 			NLA_POLICY_MAX(NLA_U8, NL80211_TID_CONFIG_DISABLE),
 };
@@ -1957,6 +1959,40 @@ nl80211_put_iftype_akm_suites(struct cfg80211_registered_device *rdev,
 	return 0;
 }
 
+static int
+nl80211_put_tid_config_support(struct cfg80211_registered_device *rdev,
+			       struct sk_buff *msg)
+{
+	struct nlattr *supp;
+
+	if (!rdev->wiphy.tid_config_support.vif &&
+	    !rdev->wiphy.tid_config_support.peer)
+		return 0;
+
+	supp = nla_nest_start(msg, NL80211_ATTR_TID_CONFIG);
+	if (!supp)
+		return -ENOSPC;
+
+	if (rdev->wiphy.tid_config_support.vif &&
+	    nla_put_u64_64bit(msg, NL80211_TID_CONFIG_ATTR_VIF_SUPP,
+			      rdev->wiphy.tid_config_support.vif,
+			      NL80211_TID_CONFIG_ATTR_PAD))
+		goto fail;
+
+	if (rdev->wiphy.tid_config_support.peer &&
+	    nla_put_u64_64bit(msg, NL80211_TID_CONFIG_ATTR_PEER_SUPP,
+			      rdev->wiphy.tid_config_support.peer,
+			      NL80211_TID_CONFIG_ATTR_PAD))
+		goto fail;
+
+	nla_nest_end(msg, supp);
+
+	return 0;
+fail:
+	nla_nest_cancel(msg, supp);
+	return -ENOBUFS;
+}
+
 struct nl80211_dump_wiphy_state {
 	s64 filter_wiphy;
 	long start;
@@ -2518,6 +2554,9 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *rdev,
 		if (nl80211_put_iftype_akm_suites(rdev, msg))
 			goto nla_put_failure;
 
+		if (nl80211_put_tid_config_support(rdev, msg))
+			goto nla_put_failure;
+
 		/* done */
 		state->split_start = 0;
 		break;
@@ -13944,57 +13983,26 @@ static int nl80211_probe_mesh_link(struct sk_buff *skb, struct genl_info *info)
 	return rdev_probe_mesh_link(rdev, dev, dest, buf, len);
 }
 
-static int
-__nl80211_check_tid_conf_support(struct cfg80211_registered_device *rdev,
-				 struct netlink_ext_ack *extack,
-				 const u8 *peer, struct nlattr *attrs[],
-				 struct ieee80211_tid_cfg *tid_conf,
-				 enum nl80211_tid_config_attr attr,
-				 enum nl80211_ext_feature_index per_tid_config,
-				 enum nl80211_ext_feature_index per_sta_config)
-{
-	if (!wiphy_ext_feature_isset(&rdev->wiphy, per_tid_config)) {
-		NL_SET_ERR_MSG_ATTR(extack, attrs[attr],
-				    "TID specific configuration not supported");
-		return -ENOTSUPP;
-	}
-
-	if (peer && !wiphy_ext_feature_isset(&rdev->wiphy, per_sta_config)) {
-		NL_SET_ERR_MSG_ATTR(extack, attrs[attr],
-				    "peer specific TID configuration not supported");
-		return -ENOTSUPP;
-	}
-
-	tid_conf->tid_conf_mask |= BIT(attr);
-	return 0;
-}
-
-#define nl80211_check_tid_config_support(rdev, extack, peer, attrs, tid_conf, \
-					 conf)	\
-	__nl80211_check_tid_conf_support(rdev, extack, peer, attrs, tid_conf, \
-				 NL80211_TID_CONFIG_ATTR_##conf,	\
-				 NL80211_EXT_FEATURE_PER_TID_##conf##_CONFIG, \
-				 NL80211_EXT_FEATURE_PER_STA_##conf##_CONFIG)
-
 static int parse_tid_conf(struct cfg80211_registered_device *rdev,
 			  struct nlattr *attrs[], struct net_device *dev,
-			  struct ieee80211_tid_cfg *tid_conf,
+			  struct cfg80211_tid_cfg *tid_conf,
 			  struct genl_info *info, const u8 *peer)
 {
 	struct netlink_ext_ack *extack = info->extack;
+	u64 mask;
 	int err;
 
 	if (!attrs[NL80211_TID_CONFIG_ATTR_TIDS])
 		return -EINVAL;
 
 	tid_conf->config_override =
 			nla_get_flag(attrs[NL80211_TID_CONFIG_ATTR_OVERRIDE]);
-	tid_conf->tid = nla_get_u8(attrs[NL80211_TID_CONFIG_ATTR_TIDS]);
+	tid_conf->tids = nla_get_u16(attrs[NL80211_TID_CONFIG_ATTR_TIDS]);
 
 	if (tid_conf->config_override) {
 		if (rdev->ops->reset_tid_config) {
 			err = rdev_reset_tid_config(rdev, dev, peer,
-						    tid_conf->tid);
+						    tid_conf->tids);
 			/* If peer is there no other configuration will be
 			 * allowed
 			 */
@@ -14006,16 +14014,21 @@ static int parse_tid_conf(struct cfg80211_registered_device *rdev,
 	}
 
 	if (attrs[NL80211_TID_CONFIG_ATTR_NOACK]) {
-		err = nl80211_check_tid_config_support(rdev, extack, peer,
-						       attrs, tid_conf,
-						       NOACK);
-		if (err)
-			return err;
-
+		tid_conf->mask |= BIT(NL80211_TID_CONFIG_ATTR_NOACK);
 		tid_conf->noack =
 			nla_get_u8(attrs[NL80211_TID_CONFIG_ATTR_NOACK]);
 	}
 
+	if (peer)
+		mask = rdev->wiphy.tid_config_support.peer;
+	else
+		mask = rdev->wiphy.tid_config_support.vif;
+
+	if (tid_conf->mask & ~mask) {
+		NL_SET_ERR_MSG(extack, "unsupported TID configuration");
+		return -ENOTSUPP;
+	}
+
 	return 0;
 }
 
@@ -14025,7 +14038,7 @@ static int nl80211_set_tid_config(struct sk_buff *skb,
 	struct cfg80211_registered_device *rdev = info->user_ptr[0];
 	struct nlattr *attrs[NL80211_TID_CONFIG_ATTR_MAX + 1];
 	struct net_device *dev = info->user_ptr[1];
-	struct ieee80211_tid_config *tid_config;
+	struct cfg80211_tid_config *tid_config;
 	struct nlattr *tid;
 	int conf_idx = 0, rem_conf;
 	int ret = -EINVAL;

net/wireless/rdev-ops.h

@@ -1328,7 +1328,7 @@ rdev_probe_mesh_link(struct cfg80211_registered_device *rdev,
 
 static inline int rdev_set_tid_config(struct cfg80211_registered_device *rdev,
 				      struct net_device *dev,
-				      struct ieee80211_tid_config *tid_conf)
+				      struct cfg80211_tid_config *tid_conf)
 {
 	int ret;
 
@@ -1340,12 +1340,12 @@ static inline int rdev_set_tid_config(struct cfg80211_registered_device *rdev,
 
 static inline int rdev_reset_tid_config(struct cfg80211_registered_device *rdev,
 					struct net_device *dev, const u8 *peer,
-					u8 tid)
+					u8 tids)
 {
 	int ret;
 
-	trace_rdev_reset_tid_config(&rdev->wiphy, dev, peer, tid);
-	ret = rdev->ops->reset_tid_config(&rdev->wiphy, dev, peer, tid);
+	trace_rdev_reset_tid_config(&rdev->wiphy, dev, peer, tids);
+	ret = rdev->ops->reset_tid_config(&rdev->wiphy, dev, peer, tids);
 	trace_rdev_return_int(&rdev->wiphy, ret);
 	return ret;
 }