[RFC v2] mac80211: assign needed_headroom/tailroom for netdevs

Johannes Berg
2008-05-04T21:32:25Z

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-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>
---
net/mac80211/iface.c | 9 +++++++++
1 file changed, 9 insertions(+)

--- everything.orig/net/mac80211/iface.c 2008-05-04 23:24:17.000000000 +0200
+++ everything/net/mac80211/iface.c 2008-05-04 23:31:46.000000000 +0200
@@ -53,6 +53,15 @@ int ieee80211_if_add(struct net_device *
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;

--
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