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mac80211: assign needed_headroom/tailroom for netdevs 

This assigns the netdev's needed_headroom/tailroom members to take
advantage of pre-allocated space for 802.11 headers.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2008-05-12 20:51:44 -07:00 committed by David S. Miller
parent f5184d267c
commit f3994eceeb
1 changed files with 9 additions and 0 deletions
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9
net/mac80211/iface.c
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@ -54,6 +54,15 @@ int ieee80211_if_add(struct net_device *dev, const char *name,
if (!ndev)
return -ENOMEM;
ndev->needed_headroom = local->tx_headroom +
4*6 /* four MAC addresses */
+ 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
+ 6 /* mesh */
+ 8 /* rfc1042/bridge tunnel */
- ETH_HLEN /* ethernet hard_header_len */
+ IEEE80211_ENCRYPT_HEADROOM;
ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
ret = dev_alloc_name(ndev, ndev->name);
if (ret < 0)
goto fail;