mac80211: let the driver reserve extra tailroom in beacons
authorFelix Fietkau <nbd@openwrt.org>
Sat, 14 Dec 2013 12:54:53 +0000 (13:54 +0100)
committerJohannes Berg <johannes.berg@intel.com>
Mon, 16 Dec 2013 11:14:07 +0000 (12:14 +0100)
Can be used to add extra IEs (such as P2P NoA) without having to
reallocate the buffer.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
include/net/mac80211.h
net/mac80211/tx.c

index 22b6dd96dbc653d96d5c2de3694d63c55632420c..531785f5819ecb0ba0e665dd9be444ea8276b03d 100644 (file)
@@ -1613,6 +1613,9 @@ enum ieee80211_hw_flags {
  * @extra_tx_headroom: headroom to reserve in each transmit skb
  *     for use by the driver (e.g. for transmit headers.)
  *
+ * @extra_beacon_tailroom: tailroom to reserve in each beacon tx skb.
+ *     Can be used by drivers to add extra IEs.
+ *
  * @channel_change_time: time (in microseconds) it takes to change channels.
  *
  * @max_signal: Maximum value for signal (rssi) in RX information, used
@@ -1695,6 +1698,7 @@ struct ieee80211_hw {
        void *priv;
        u32 flags;
        unsigned int extra_tx_headroom;
+       unsigned int extra_beacon_tailroom;
        int channel_change_time;
        int vif_data_size;
        int sta_data_size;
index 6d59e21cdb9fe8b686fdcef53ddc83a83738d0cf..002ded2c01f61f0da9332ac35d0b0dfa1877d733 100644 (file)
@@ -2549,7 +2549,8 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
                         */
                        skb = dev_alloc_skb(local->tx_headroom +
                                            beacon->head_len +
-                                           beacon->tail_len + 256);
+                                           beacon->tail_len + 256 +
+                                           local->hw.extra_beacon_tailroom);
                        if (!skb)
                                goto out;
 
@@ -2581,7 +2582,8 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
                        ieee80211_update_csa(sdata, presp);
 
 
-               skb = dev_alloc_skb(local->tx_headroom + presp->head_len);
+               skb = dev_alloc_skb(local->tx_headroom + presp->head_len +
+                                   local->hw.extra_beacon_tailroom);
                if (!skb)
                        goto out;
                skb_reserve(skb, local->tx_headroom);
@@ -2608,7 +2610,8 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
                skb = dev_alloc_skb(local->tx_headroom +
                                    bcn->head_len +
                                    256 + /* TIM IE */
-                                   bcn->tail_len);
+                                   bcn->tail_len +
+                                   local->hw.extra_beacon_tailroom);
                if (!skb)
                        goto out;
                skb_reserve(skb, local->tx_headroom);