nl80211: Add set/get for frag/rts threshold and retry limits

Add new nl80211 attributes that can be used with NL80211_CMD_SET_WIPHY
and NL80211_CMD_GET_WIPHY to manage fragmentation/RTS threshold and
retry limits.

Since these values are stored in struct wiphy, remove the local copy
from mac80211 where feasible (frag & rts threshold). The retry limits
are currently needed in struct ieee80211_conf, but these could be
eventually removed since the driver should have access to the values
in struct wiphy.

Signed-off-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 72 insertions, 2 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 25ce3e42bd1..dc9d9ec5d1a 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -46,8 +46,10 @@
  *	to get a list of all present wiphys.
  * @NL80211_CMD_SET_WIPHY: set wiphy parameters, needs %NL80211_ATTR_WIPHY or
  *	%NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME,
- *	%NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ, and/or
- *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE.
+ *	%NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ,
+ *	%NL80211_ATTR_WIPHY_CHANNEL_TYPE, %NL80211_ATTR_WIPHY_RETRY_SHORT,
+ *	%NL80211_ATTR_WIPHY_RETRY_LONG, %NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
+ *	and/or %NL80211_ATTR_WIPHY_RTS_THRESHOLD.
  * @NL80211_CMD_NEW_WIPHY: Newly created wiphy, response to get request
  *	or rename notification. Has attributes %NL80211_ATTR_WIPHY and
  *	%NL80211_ATTR_WIPHY_NAME.
@@ -337,6 +339,18 @@ enum nl80211_commands {
  *	NL80211_CHAN_HT20 = HT20 only
  *	NL80211_CHAN_HT40MINUS = secondary channel is below the primary channel
  *	NL80211_CHAN_HT40PLUS = secondary channel is above the primary channel
+ * @NL80211_ATTR_WIPHY_RETRY_SHORT: TX retry limit for frames whose length is
+ *	less than or equal to the RTS threshold; allowed range: 1..255;
+ *	dot11ShortRetryLimit; u8
+ * @NL80211_ATTR_WIPHY_RETRY_LONG: TX retry limit for frames whose length is
+ *	greater than the RTS threshold; allowed range: 1..255;
+ *	dot11ShortLongLimit; u8
+ * @NL80211_ATTR_WIPHY_FRAG_THRESHOLD: fragmentation threshold, i.e., maximum
+ *	length in octets for frames; allowed range: 256..8000, disable
+ *	fragmentation with (u32)-1; dot11FragmentationThreshold; u32
+ * @NL80211_ATTR_WIPHY_RTS_THRESHOLD: RTS threshold (TX frames with length
+ *	larger than or equal to this use RTS/CTS handshake); allowed range:
+ *	0..65536, disable with (u32)-1; dot11RTSThreshold; u32
  *
  * @NL80211_ATTR_IFINDEX: network interface index of the device to operate on
  * @NL80211_ATTR_IFNAME: network interface name
@@ -565,6 +579,12 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_FREQ_FIXED,
 
+
+	NL80211_ATTR_WIPHY_RETRY_SHORT,
+	NL80211_ATTR_WIPHY_RETRY_LONG,
+	NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
+	NL80211_ATTR_WIPHY_RTS_THRESHOLD,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 601eac64b02..54bc69c8369 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -744,6 +744,20 @@ struct cfg80211_ibss_params {
 };
 
 /**
+ * enum wiphy_params_flags - set_wiphy_params bitfield values
+ * WIPHY_PARAM_RETRY_SHORT: wiphy->retry_short has changed
+ * WIPHY_PARAM_RETRY_LONG: wiphy->retry_long has changed
+ * WIPHY_PARAM_FRAG_THRESHOLD: wiphy->frag_threshold has changed
+ * WIPHY_PARAM_RTS_THRESHOLD: wiphy->rts_threshold has changed
+ */
+enum wiphy_params_flags {
+	WIPHY_PARAM_RETRY_SHORT		= 1 << 0,
+	WIPHY_PARAM_RETRY_LONG		= 1 << 1,
+	WIPHY_PARAM_FRAG_THRESHOLD	= 1 << 2,
+	WIPHY_PARAM_RTS_THRESHOLD	= 1 << 3,
+};
+
+/**
  * struct cfg80211_ops - backend description for wireless configuration
  *
  * This struct is registered by fullmac card drivers and/or wireless stacks
@@ -823,6 +837,11 @@ struct cfg80211_ibss_params {
  *	cfg80211_ibss_joined(), also call that function when changing BSSID due
  *	to a merge.
  * @leave_ibss: Leave the IBSS.
+ *
+ * @set_wiphy_params: Notify that wiphy parameters have changed;
+ *	@changed bitfield (see &enum wiphy_params_flags) describes which values
+ *	have changed. The actual parameter values are available in
+ *	struct wiphy. If returning an error, no value should be changed.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy);
@@ -912,6 +931,8 @@ struct cfg80211_ops {
 	int	(*join_ibss)(struct wiphy *wiphy, struct net_device *dev,
 			     struct cfg80211_ibss_params *params);
 	int	(*leave_ibss)(struct wiphy *wiphy, struct net_device *dev);
+
+	int	(*set_wiphy_params)(struct wiphy *wiphy, u32 changed);
 };
 
 /*
@@ -945,6 +966,11 @@ struct cfg80211_ops {
  * @signal_type: signal type reported in &struct cfg80211_bss.
  * @cipher_suites: supported cipher suites
  * @n_cipher_suites: number of supported cipher suites
+ * @retry_short: Retry limit for short frames (dot11ShortRetryLimit)
+ * @retry_long: Retry limit for long frames (dot11LongRetryLimit)
+ * @frag_threshold: Fragmentation threshold (dot11FragmentationThreshold);
+ *	-1 = fragmentation disabled, only odd values >= 256 used
+ * @rts_threshold: RTS threshold (dot11RTSThreshold); -1 = RTS/CTS disabled
  */
 struct wiphy {
 	/* assign these fields before you register the wiphy */
@@ -967,6 +993,11 @@ struct wiphy {
 	int n_cipher_suites;
 	const u32 *cipher_suites;
 
+	u8 retry_short;
+	u8 retry_long;
+	u32 frag_threshold;
+	u32 rts_threshold;
+
 	/* If multiple wiphys are registered and you're handed e.g.
 	 * a regular netdev with assigned ieee80211_ptr, you won't
 	 * know whether it points to a wiphy your driver has registered
@@ -1345,6 +1376,25 @@ int cfg80211_ibss_wext_giwap(struct net_device *dev,
 struct ieee80211_channel *cfg80211_wext_freq(struct wiphy *wiphy,
 					     struct iw_freq *freq);
 
+int cfg80211_wext_siwrts(struct net_device *dev,
+			 struct iw_request_info *info,
+			 struct iw_param *rts, char *extra);
+int cfg80211_wext_giwrts(struct net_device *dev,
+			 struct iw_request_info *info,
+			 struct iw_param *rts, char *extra);
+int cfg80211_wext_siwfrag(struct net_device *dev,
+			  struct iw_request_info *info,
+			  struct iw_param *frag, char *extra);
+int cfg80211_wext_giwfrag(struct net_device *dev,
+			  struct iw_request_info *info,
+			  struct iw_param *frag, char *extra);
+int cfg80211_wext_siwretry(struct net_device *dev,
+			   struct iw_request_info *info,
+			   struct iw_param *retry, char *extra);
+int cfg80211_wext_giwretry(struct net_device *dev,
+			   struct iw_request_info *info,
+			   struct iw_param *retry, char *extra);
+
 /*
  * callbacks for asynchronous cfg80211 methods, notification
  * functions and BSS handling helpers