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>

1 files changed, 29 insertions, 22 deletions

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 0b12fcffb518..591d843eda72 100644
--- a/include/uapi/linux/nl80211.h
+++ b/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,