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>

1 files changed, 50 insertions, 0 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 601eac64b02d..54bc69c83691 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