On Tue, 6 Oct 2020 18:24:28 -0700
Maciej Żenczykowski <maze@xxxxxxxxxx> wrote:
> On Tue, Oct 6, 2020 at 6:19 PM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
> >
> > On Tue, 6 Oct 2020 18:33:02 +0200 Jesper Dangaard Brouer wrote:
> > > > +static const struct bpf_func_proto bpf_xdp_mtu_lookup_proto = {
> > > > + .func = bpf_xdp_mtu_lookup,
> > > > + .gpl_only = true,
> > > > + .ret_type = RET_INTEGER,
> > > > + .arg1_type = ARG_PTR_TO_CTX,
> > > > + .arg2_type = ARG_ANYTHING,
> > > > + .arg3_type = ARG_ANYTHING,
> > > > +};
> > > > +
> > > > +
> >
> > FWIW
> >
> > CHECK: Please don't use multiple blank lines
> > #112: FILE: net/core/filter.c:5566:
>
> FYI: It would be nice to have a similar function to return a device's
> L2 header size (ie. 14 for ethernet) and/or hwtype.
>
> Also, should this be restricted to gpl only?
That is mostly because I copy-pasted it from the fib lookup helper,
which with good reason is GPL. I would prefer it to be GPL, but given
how simple it is I shouldn't. Maybe I could argue that my new mtu_check
could be GPL as it does more work.
> [I'm not actually sure, I'm actually fed up with non-gpl code atm, and
> wouldn't be against all bpf code needing to be gpl'ed...]
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
