ieee802154: change needed headroom/tailroom
authorAlexander Aring <alex.aring@gmail.com>
Fri, 18 Sep 2015 09:30:43 +0000 (11:30 +0200)
committerMarcel Holtmann <marcel@holtmann.org>
Tue, 22 Sep 2015 09:51:20 +0000 (11:51 +0200)
commit87a93e4eceb495f93e3f37b100334d2641765b6c
treed917662b1912a9788cdf431fc735b243e32dfb6c
parent838b83d63d2909f9136f3030dc4fffa8230c31da
ieee802154: change needed headroom/tailroom

This patch cleanups needed_headroom, needed_tailroom and hard_header_len
fields for wpan and lowpan interfaces.

For wpan interfaces the worst case mac header len should be part of
needed_headroom, currently this is set as hard_header_len, but
hard_header_len should be set to the minimum header length which xmit
call assumes and this is the minimum frame length of 802.15.4.
The hard_header_len value will check inside send callbacl of AF_PACKET
raw sockets.

For lowpan interfaces, if fragmentation isn't needed the skb will
call dev_hard_header for 802154 layer and queue it afterwards. This
happens without new skb allocation, so we need the same headroom and
tailroom lengths like 802154 inside 802154 6lowpan layer. At least we
assume as minimum header length an ipv6 header size.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
include/linux/ieee802154.h
include/net/6lowpan.h
include/net/mac802154.h
net/6lowpan/nhc.h
net/ieee802154/6lowpan/core.c
net/ieee802154/6lowpan/tx.c
net/ieee802154/header_ops.c
net/mac802154/iface.c
net/mac802154/tx.c