nl80211: New command for setting TX rate mask for rate control

Add a new NL80211_CMD_SET_TX_BITRATE_MASK command and related
attributes to provide support for setting TX rate mask for rate
control. This uses the existing cfg80211 set_bitrate_mask operation
that was previously used only with WEXT compat code (SIOCSIWRATE). The
nl80211 command allows more generic configuration of allowed rates as
a mask instead of fixed/max rate.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 46 insertions, 2 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index d4c556d..7a1c8c1 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -295,6 +295,10 @@
  *	This command is also used as an event to notify when a requested
  *	remain-on-channel duration has expired.
  *
+ * @NL80211_CMD_SET_TX_BITRATE_MASK: Set the mask of rates to be used in TX
+ *	rate selection. %NL80211_ATTR_IFINDEX is used to specify the interface
+ *	and @NL80211_ATTR_TX_RATES the set of allowed rates.
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -381,6 +385,8 @@ enum nl80211_commands {
 	NL80211_CMD_REMAIN_ON_CHANNEL,
 	NL80211_CMD_CANCEL_REMAIN_ON_CHANNEL,
 
+	NL80211_CMD_SET_TX_BITRATE_MASK,
+
 	/* add new commands above here */
 
 	/* used to define NL80211_CMD_MAX below */
@@ -640,6 +646,13 @@ enum nl80211_commands {
  *
  * @NL80211_ATTR_COOKIE: Generic 64-bit cookie to identify objects.
  *
+ * @NL80211_ATTR_TX_RATES: Nested set of attributes
+ *	(enum nl80211_tx_rate_attributes) describing TX rates per band. The
+ *	enum nl80211_band value is used as the index (nla_type() of the nested
+ *	data. If a band is not included, it will be configured to allow all
+ *	rates based on negotiated supported rates information. This attribute
+ *	is used with %NL80211_CMD_SET_TX_BITRATE_MASK.
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -783,6 +796,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_WIPHY_COVERAGE_CLASS,
 
+	NL80211_ATTR_TX_RATES,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -1482,4 +1497,33 @@ enum nl80211_key_attributes {
 	NL80211_KEY_MAX = __NL80211_KEY_AFTER_LAST - 1
 };
 
+/**
+ * enum nl80211_tx_rate_attributes - TX rate set attributes
+ * @__NL80211_TXRATE_INVALID: invalid
+ * @NL80211_TXRATE_LEGACY: Legacy (non-MCS) rates allowed for TX rate selection
+ *	in an array of rates as defined in IEEE 802.11 7.3.2.2 (u8 values with
+ *	1 = 500 kbps) but without the IE length restriction (at most
+ *	%NL80211_MAX_SUPP_RATES in a single array).
+ * @__NL80211_TXRATE_AFTER_LAST: internal
+ * @NL80211_TXRATE_MAX: highest TX rate attribute
+ */
+enum nl80211_tx_rate_attributes {
+	__NL80211_TXRATE_INVALID,
+	NL80211_TXRATE_LEGACY,
+
+	/* keep last */
+	__NL80211_TXRATE_AFTER_LAST,
+	NL80211_TXRATE_MAX = __NL80211_TXRATE_AFTER_LAST - 1
+};
+
+/**
+ * enum nl80211_band - Frequency band
+ * @NL80211_BAND_2GHZ - 2.4 GHz ISM band
+ * @NL80211_BAND_5GHZ - around 5 GHz band (4.9 - 5.7 GHz)
+ */
+enum nl80211_band {
+	NL80211_BAND_2GHZ,
+	NL80211_BAND_5GHZ,
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 22e062a..0d73441 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -39,8 +39,8 @@
  * @IEEE80211_BAND_5GHZ: around 5GHz band (4.9-5.7)
  */
 enum ieee80211_band {
-	IEEE80211_BAND_2GHZ,
-	IEEE80211_BAND_5GHZ,
+	IEEE80211_BAND_2GHZ = NL80211_BAND_2GHZ,
+	IEEE80211_BAND_5GHZ = NL80211_BAND_5GHZ,
 
 	/* keep last */
 	IEEE80211_NUM_BANDS