netdev - Re: [PATCH bpf-next v4 04/10] bpf: Introduce mem, size argument pair support for kfunc

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Date:   Sun, 19 Dec 2021 08:23:53 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCH bpf-next v4 04/10] bpf: Introduce mem, size argument pair
 support for kfunc

On Sun, Dec 19, 2021 at 07:49:22AM IST, Alexei Starovoitov wrote:
> On Fri, Dec 17, 2021 at 07:20:25AM +0530, Kumar Kartikeya Dwivedi wrote:
> > +static bool is_kfunc_arg_mem_size(const struct btf *btf,
> > +				  const struct btf_param *arg,
> > +				  const struct bpf_reg_state *reg)
> > +{
> > +	const struct btf_type *t;
> > +	const char *param_name;
> > +
> > +	t = btf_type_skip_modifiers(btf, arg->type, NULL);
> > +	if (!btf_type_is_scalar(t) || reg->type != SCALAR_VALUE)
> > +		return false;
> > +
> > +	/* In the future, this can be ported to use BTF tagging */
> > +	param_name = btf_name_by_offset(btf, arg->name_off);
> > +	if (strncmp(param_name, "len__", sizeof("len__") - 1))
> > +		return false;
>
> I like the feature and approach, but have a suggestion:
> The "__sz" suffix would be shorter and more readable.
> wdyt?

Sounds good, I'll change this in v5.

--
Kartikeya