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

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Message-ID: <20200724075303.GK2531@dhcp-12-153.nay.redhat.com>
Date:   Fri, 24 Jul 2020 15:53:03 +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 Fri, Jul 17, 2020 at 05:11:22PM +0800, Hangbin Liu wrote:
> 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?

ping?