On Sat, 2009-07-04 at 00:53 +0200, Christian Lamparter wrote: > the simplest answer is probably this one: > https://dev.openwrt.org/changeset/15761 Humm. Davem and I looked into this problem some time ago, came up with patches and concluded that if everything is set up correctly this shouldn't be happening. Look at net/mac80211/iface.c::ieee80211_if_add: 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; Due to that, skbs allocated for our device ought to have enough headroom. If they don't, you should try to figure out where they're coming from and why they don't, http://johannes.sipsolutions.net/patches/kernel/all/2008-05-04-23:09/028-skb-alloc-stackdump.patch might help with that. OTOH, I guess that you're using IPv4 and that should do things correctly, I think. johannes
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