From: David S. Miller Date: Tue, 31 Dec 2013 21:23:35 +0000 (-0500) Subject: vlan: Fix header ops passthru when doing TX VLAN offload. X-Git-Tag: v3.2.55~68 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=31da359741b539fb236d5781b46ee7c5c6d8f14c;p=pandora-kernel.git vlan: Fix header ops passthru when doing TX VLAN offload. [ Upstream commit 2205369a314e12fcec4781cc73ac9c08fc2b47de ] When the vlan code detects that the real device can do TX VLAN offloads in hardware, it tries to arrange for the real device's header_ops to be invoked directly. But it does so illegally, by simply hooking the real device's header_ops up to the VLAN device. This doesn't work because we will end up invoking a set of header_ops routines which expect a device type which matches the real device, but will see a VLAN device instead. Fix this by providing a pass-thru set of header_ops which will arrange to pass the proper real device instead. To facilitate this add a dev_rebuild_header(). There are implementations which provide a ->cache and ->create but not a ->rebuild (f.e. PLIP). So we need a helper function just like dev_hard_header() to avoid crashes. Use this helper in the one existing place where the header_ops->rebuild was being invoked, the neighbour code. With lots of help from Florian Westphal. Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- Reading git-diff-tree failed