From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johannes Berg Subject: [RFC] mac80211: assign needed_headroom/tailroom for netdevs Date: Sun, 04 May 2008 23:24:13 +0200 Message-ID: <1209936253.7304.10.camel@johannes.berg> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , netdev , linux-wireless To: John Linville Return-path: Sender: linux-wireless-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org 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 --- Builds on my other patch to add those fields, of course! net/mac80211/iface.c | 8 ++++++++ net/mac80211/tx.c | 14 +++++++++----- 2 files changed, 17 insertions(+), 5 deletions(-) --- everything.orig/net/mac80211/iface.c 2008-05-04 15:40:53.000000000 +0200 +++ everything/net/mac80211/iface.c 2008-05-04 16:08:45.000000000 +0200 @@ -53,6 +53,14 @@ 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 */ + - 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; -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html