[MAC80211]: implement ERP info change notifications

zd1211rw and bcm43xx are interested in being notified when ERP IE conditions
change, so that they can reprogram a register which affects how control frames
are transmitted.

This patch adds an interface similar to the one that can be found in softmac.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 3282038..e503cd3 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -697,6 +697,14 @@ struct ieee80211_ops {
        void (*sta_table_notification)(struct ieee80211_hw *hw,
                                       int num_sta);
 
+       /* Handle ERP IE change notifications. Must be atomic. */
+       void (*erp_ie_changed)(struct ieee80211_hw *hw, u8 changes,
+                              int cts_protection, int preamble);
+
+       /* Flags for the erp_ie_changed changes parameter */
+#define IEEE80211_ERP_CHANGE_PROTECTION (1<<0) /* protection flag changed */
+#define IEEE80211_ERP_CHANGE_PREAMBLE (1<<1) /* barker preamble mode changed */
+
        /* Configure TX queue parameters (EDCF (aifs, cw_min, cw_max),
         * bursting) for a hardware TX queue.
         * queue = IEEE80211_TX_QUEUE_*.

diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index f811a26..4715a95 100644 (file)
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -464,8 +464,10 @@ static int ieee80211_open(struct net_device *dev)
        if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
                local->monitors++;
                local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
-       } else
+       } else {
                ieee80211_if_config(dev);
+               ieee80211_reset_erp_info(dev);
+       }
 
        if (sdata->type == IEEE80211_IF_TYPE_STA &&
            !local->user_space_mlme)
@@ -748,6 +750,27 @@ int ieee80211_hw_config(struct ieee80211_local *local)
        return ret;
 }
 
+void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
+{
+       struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+       struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+       if (local->ops->erp_ie_changed)
+               local->ops->erp_ie_changed(local_to_hw(local), changes,
+                                          sdata->use_protection,
+                                          !sdata->short_preamble);
+}
+
+void ieee80211_reset_erp_info(struct net_device *dev)
+{
+       struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+       sdata->short_preamble = 0;
+       sdata->use_protection = 0;
+       ieee80211_erp_info_change_notify(dev,
+                                        IEEE80211_ERP_CHANGE_PROTECTION |
+                                        IEEE80211_ERP_CHANGE_PREAMBLE);
+}
+
 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
                                               struct dev_mc_list *prev,
                                               void **ptr)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index b0af6e9..cc9999c 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -788,6 +788,8 @@ struct sta_info * ieee80211_ibss_add_sta(struct net_device *dev,
                                         u8 *addr);
 int ieee80211_sta_deauthenticate(struct net_device *dev, u16 reason);
 int ieee80211_sta_disassociate(struct net_device *dev, u16 reason);
+void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes);
+void ieee80211_reset_erp_info(struct net_device *dev);
 
 /* ieee80211_iface.c */
 int ieee80211_if_add(struct net_device *dev, const char *name,

diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index 8292431..1fde214 100644 (file)
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -1054,17 +1054,21 @@ static int ieee80211_ioctl_prism2_param(struct net_device *dev,
                break;
 
        case PRISM2_PARAM_CTS_PROTECT_ERP_FRAMES:
-               if (sdata->type != IEEE80211_IF_TYPE_AP)
+               if (sdata->type == IEEE80211_IF_TYPE_AP) {
+                       sdata->use_protection = !!value;
+                       ieee80211_erp_info_change_notify(dev, IEEE80211_ERP_CHANGE_PROTECTION);
+               } else {
                        ret = -ENOENT;
-               else
-                       sdata->use_protection = value;
+               }
                break;
 
        case PRISM2_PARAM_PREAMBLE:
-               if (sdata->type != IEEE80211_IF_TYPE_AP)
+               if (sdata->type != IEEE80211_IF_TYPE_AP) {
+                       sdata->short_preamble = !!value;
+                       ieee80211_erp_info_change_notify(dev, IEEE80211_ERP_CHANGE_PREAMBLE);
+               } else {
                        ret = -ENOENT;
-               else
-                       sdata->short_preamble = value;
+               }
                break;
 
        case PRISM2_PARAM_STAT_TIME:

diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 0f5f813..33414f1 100644 (file)
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -319,6 +319,7 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
        struct ieee80211_if_sta *ifsta = &sdata->u.sta;
        int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
        int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
+       u8 changes = 0;
 
        if (use_protection != sdata->use_protection) {
                if (net_ratelimit()) {
@@ -329,6 +330,7 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
                               MAC_ARG(ifsta->bssid));
                }
                sdata->use_protection = use_protection;
+               changes |= IEEE80211_ERP_CHANGE_PROTECTION;
        }
 
        if (!preamble_mode != sdata->short_preamble) {
@@ -341,7 +343,11 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
                               MAC_ARG(ifsta->bssid));
                }
                sdata->short_preamble = !preamble_mode;
+               changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
        }
+
+       if (changes)
+               ieee80211_erp_info_change_notify(dev, changes);
 }
 
 
@@ -400,7 +406,6 @@ static void ieee80211_set_associated(struct net_device *dev,
                                     struct ieee80211_if_sta *ifsta, int assoc)
 {
        union iwreq_data wrqu;
-       struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
        if (ifsta->associated == assoc)
                return;
@@ -428,8 +433,7 @@ static void ieee80211_set_associated(struct net_device *dev,
                ieee80211_sta_send_associnfo(dev, ifsta);
        } else {
                netif_carrier_off(dev);
-               sdata->short_preamble = 0;
-               sdata->use_protection = 0;
+               ieee80211_reset_erp_info(dev);
                memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
        }
        wrqu.ap_addr.sa_family = ARPHRD_ETHER;