netdev - Re: [PATCH bpf-next] bpf: add a new bpf argument type ARG_CONST_MAP_PTR_OR

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Date:   Fri, 17 Jul 2020 17:11:11 +0800
From:   Hangbin Liu <liuhangbin@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>, ast@...nel.org
Subject: Re: [PATCH bpf-next] bpf: add a new bpf argument type
 ARG_CONST_MAP_PTR_OR_NULL

On Thu, Jul 16, 2020 at 12:28:16AM +0200, Daniel Borkmann wrote:
> > diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> > index c67c88ad35f8..9d4dbef3c943 100644
> > --- a/include/linux/bpf.h
> > +++ b/include/linux/bpf.h
> > @@ -253,6 +253,7 @@ enum bpf_arg_type {
> >   	ARG_PTR_TO_ALLOC_MEM,	/* pointer to dynamically allocated memory */
> >   	ARG_PTR_TO_ALLOC_MEM_OR_NULL,	/* pointer to dynamically allocated memory or NULL */
> >   	ARG_CONST_ALLOC_SIZE_OR_ZERO,	/* number of allocated bytes requested */
> > +	ARG_CONST_MAP_PTR_OR_NULL,	/* const argument used as pointer to bpf_map or NULL */
> >   };
> In combination with the set, this also needs test_verifier selftests in order to
> exercise BPF insn snippets for the good & [expected] bad case.

Hi Daniel,

I just come up with a question, how should I test it without no bpf
helper using it? Should I wait until the XDP multicast patch set merged?

Thanks
Hangbin