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

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Message-Id: <1209936745.7304.16.camel@johannes.berg>
Date:	Sun, 04 May 2008 23:32:25 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	John Linville <linville@...driver.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>
Subject: [RFC v2] 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@...solutions.net>
---
 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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