Re: [PATCH 0/3] net: propagate dynamic needed_headroom/tailroom changes

Tue, Aug 20, 2013 at 02:45:49PM CEST, f.fainelli@gmail.com wrote:

Hi all,

This patchset aims at allowing dynamically changing a given device
needed_headroom/tailroom space and propagating such events to stacked
devices such as bridges and vlans.

You should also add support for other stacked devices, like bonding,
team, macvlan, ovs-datapath, etc.	
	

Unless callers use the new helpers (dev_set_headroom/dev_set_tailroom)
there is no functional change introduced.

I tested this with an out of tree Ethernet driver with both VLANs and
bridges and the need for a 64-byte headroom to insert a transmit
status descriptor in front of a SKB.

Would be nice to add at least one driver which would use your new api.

Thanks,
	Jiri

Since I am not familiar with all subsystems/drivers changing the
needed_headroom/tailroom requirements, I would leave that to them.

Florian Fainelli (3):
 net: add a new NETDEV_CHANGEROOM event type
 net: vlan: handle NETDEV_CHANGEROOM events
 net: bridge: handle NETDEV_CHANGEROOM event

include/linux/netdevice.h |  3 +++
net/8021q/vlan.c          |  7 +++++++
net/bridge/br_if.c        | 32 ++++++++++++++++++++++++++++++++
net/bridge/br_notify.c    |  5 +++++
net/bridge/br_private.h   |  2 ++
net/core/dev.c            | 46 ++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 95 insertions(+)

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1.8.1.2