On Thu, Nov 22, 2018 at 11:49:55AM -0800, Guenter Roeck wrote:
> On 11/22/18 10:07 AM, Murilo Fossa Vicentini wrote:
> > On 22/11/18 14:33, Guenter Roeck wrote:
> > > drivers/net/ethernet/ibm/ibmvnic.c: In function 'ibmvnic_xmit':
> > > drivers/net/ethernet/ibm/ibmvnic.c:789:40: error: implicit declaration of function 'skb_vlan_tag_present'
> > >
> > > Caused by 5f51bb855fa1 ("ibmvnic: fix accelerated VLAN handling").
> > > Problem is missing include of linux/if_vlan.h, which was added upstream
> > > with commit 6052d5e2a1961b ("ibmvnic: Insert header on VLAN tagged
> > > received frame").
> > >
> > > I have no idea if the offending patch fixes 6052d5e2a1961b, if both are
> > > independent, if both are needed, or if none is needed.
> > > Copying the authors of both patches.
> >
> > Both address different parts of the code within the same VLAN functionality, patch 5f51bb855fa1 (or upstream e84b47941e15) is making a change on the transmit side, and the patch I sent upstream (6052d5e2a196) addresses an issue when the system firmware strips the VLAN tag on the receive side.
> >
> > In the context of having proper VLAN support for the ibmvnic driver I would say both are needed, although potentially there are other patches needed for this functionality to work properly, for example upstream commit da75e3b6a029 (ibmvnic: Account for VLAN tag in L2 Header descriptor) and upstream commit 8dff66cc4195 (ibmvnic: Account for VLAN tag in L2 Header descriptor).
> >
>
> Not my call to make, but it seems to me that it might be better to drop
> the patch from 4.9.y and ask people to use a later kernel if they need
> vlan support for the ibmvnic driver.
Thanks all for figuring this out. I'm just going to drop this patch
from the tree for now.
greg k-h
