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mac80211: Add define for TX headroom reserved by mac80211 itself. 

Add a definition of the amount of TX headroom reserved by mac80211 itself
for its own purposes. Also add BUILD_BUG_ON to validate the value.
This define can then be used by drivers to request additional TX headroom
in the most efficient manner.

Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Gertjan van Wingerde 2009-12-04 23:46:54 +01:00 committed by John W. Linville
parent b2ec153a63
commit d24deb2580
2 changed files with 8 additions and 0 deletions
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6
include/net/mac80211.h
View File

@ -1737,6 +1737,12 @@ static inline void ieee80211_rx_ni(struct ieee80211_hw *hw,
local_bh_enable();
}
/*
* The TX headroom reserved by mac80211 for its own tx_status functions.
* This is enough for the radiotap header.
*/
#define IEEE80211_TX_STATUS_HEADROOM 13
/**
* ieee80211_tx_status - transmit status callback
*

2
net/mac80211/main.c
View File

@ -515,6 +515,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
* and we need some headroom for passing the frame to monitor
* interfaces, but never both at the same time.
*/
BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
sizeof(struct ieee80211_tx_status_rtap_hdr));
local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
sizeof(struct ieee80211_tx_status_rtap_hdr));