mac80211: reduce the amount of unnecessary traffic on cooked monitor interfaces

In order to handle association and authentication in AP mode,
hostapd needs access to the tx status info of its own frames
through a cooked monitor interface. Without this patch the
cooked monitor interfaces also passed on tx status information
for packets from other virtual interfaces. This creates a
significant performance issue on embedded system. Hostapd
tries to work around this by installing a Linux Socket Filter
that only captures the frames it's interested in, however
data duplication and socket filter matching still uses up
enough CPU cycles to be very noticeable on small systems.
This patch ensures that tx status information of non-injected
frames does not make it to cooked monitor interfaces.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index beb8718d905e8989c6dd61e75bd307006b4cfee7..c74a6a1935b34b9710bed660487862fa7201e753 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -587,6 +587,11 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
                        if (!netif_running(sdata->dev))
                                continue;
 
+                       if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
+                           !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
+                           (type == IEEE80211_FTYPE_DATA))
+                               continue;
+
                        if (prev_dev) {
                                skb2 = skb_clone(skb, GFP_ATOMIC);
                                if (skb2) {